Author: Lin Mei

Editor: Bai Ze

Source: Mozi Salon

The century puzzle left by Einstein and Bohr to future generations

In the early days of the establishment of quantum mechanics, the phenomenon of "entanglement" aroused the curiosity of all physicists, and Einstein called it "strange interaction between distant places."The so-called entanglement in quantum mechanics is a phenomenon: two particles in an entangled state can maintain a special correlation state, and the state of both particles is unknown, but as long as one particle is measured, the state of the other particle can be known immediately, even if they are far apart.. In the past half century, the essence behind this phenomenon has been deeply puzzling scientists.

In the last century, the views on entanglement divided physicists into two factions: the Copenhagen school, represented by Bohr, believed that the so-called "reality" was meaningful only when it was connected with observation methods; But scientists such as Einstein can’t accept this view. They think that quantum mechanics is incomplete, and the measurement result must be predetermined by some kind of "hidden variable", but we can’t detect it. In 1935, Einstein, Podolsky and Rosen published an article entitled Can Quantum Mechanics Description of Physical Reality Be Considered Complete, demonstrating the incompleteness of quantum mechanics. Usually, people call their argument EPR Paradox or Einstein Localized Realism.

Bohr and Einstein argued about this for 50 years, and the problem was not solved until their final death, which has always attracted future generations to verify it.

How to verify it?

mentionLocalized realismIn fact, it contains two meanings:First, physical realism.Any observable physical quantity must exist objectively in a definite way, and if there is no external disturbance, the observable physical quantity should have a definite value;Second, localized causality.If the four-dimensional space-time between two events is space-like, there is no causal relationship between the two events. Based on this understanding, in 1964, the Irish physicist Bell put forward the famous "Bell Inequality", which established a strict limit on the possible correlation degree of the results when two separated particles were measured at the same time [1]. If Bell inequality is not established in the experiment, it means that the expectation based on localized realism does not conform to the theory of quantum mechanics, that is,The quantum world itself is probabilistic.

All along, people have designed various experimental schemes to verify whether Bell’s inequality is correct or not, and one after another, the results of some experimental groups tend to support the destruction of Bell’s inequality-that is, to prove the correctness of quantum mechanics. The first truly definitive experiment was made by Spector, a French physicist. Three experiments they made in the 1970s gave a clear conclusion about the nonlocality of quantum mechanics, but there were still loopholes in the initial verification of these experiments. In recent years, experimental groups in different countries have tried to gradually close local vulnerabilities, free choice vulnerabilities and detection efficiency vulnerabilities in their experiments.All the experimental results support the conclusion of quantum mechanics and prove that localized realism is wrong.

Bell inequality goes out of the laboratory and flies further.

The destruction of Bell inequality has been verified in the laboratory, so what about the situation on a larger scale? If people can verify the existence of quantum entanglement at a longer distance, it means verifying the correctness of quantum mechanics at a larger spatial scale. Therefore, people want to fly farther with Bell inequality. However, there is a stumbling block-attenuation when conducting experiments on a larger scale. What does this mean? In the actual experimentPeople often use an experiment called "quantum entanglement distribution" to verify Bell inequality, which is to send two prepared entangled particles (usually photons) to two points far apart, and to verify whether quantum mechanics and localized realism are right or wrong by observing whether the measurement results of the two points conform to Bell inequality.Because pairs of single photons are prepared and sent, the signal of single photon is not amplified because of the non-replicability of quantum, and the inherent photon loss of optical fiber makes it difficult to expand the optical quantum transmission to a longer distance. On the surface of the earth, the quantum entanglement distribution of 100 kilometers is almost the limit.

What should we do? There are two schemes,One is to use quantum relay.One relay station is a bit like an ancient relay station, transmitting photons one by one, but at present, the research of quantum relay is still limited by the time and efficiency of quantum storage;Another scheme is to realize quantum entanglement distribution by satellite.The vacuum environment in outer space has almost no attenuation and decoherence effects on light transmission. The free space channel loss between the satellite and the earth is small, and even in theory, scientists can establish a quantum channel between any two points on the earth by using satellites, and it is possible to realize quantum entanglement distribution at a long distance on a global scale.

On December 9, 2016, at the Ali Observatory in Tibet, researchers were doing experiments.

Fortunately, in this respect, Chinese is at the forefront of the world.

As early as 2003, China’s Pan Jianwei team put forward a scheme to realize long-distance quantum entanglement distribution by satellite, and started preliminary verification. The team’s researchers believe that in order to prove that it is feasible for satellites to realize quantum entanglement distribution, it is necessary to prove that photons can remain coherent after penetrating the atmosphere, so they began to do experiments in Dashu Mountain, Hefei. In this experiment, the sender is in Dashu Mountain, and the two receiving points are in Feixi farmer’s home and the west campus of Chinese University of Science and Technology, which are several kilometers away. It is the first time in the world to realize the two-way quantum entanglement distribution in free space with a horizontal distance of 13 kilometers (the vertical thickness of the atmosphere is about 5-10 kilometers), which proves that the entangled state can still "survive" after long-distance atmospheric channel transmission. On the other hand, this transmission distance exceeds the equivalent thickness of the atmosphere, which proves the feasibility of long-distance free space quantum communication.

Two-way quantum entanglement distribution in free space with a horizontal distance of 13 kilometers in 2005

In 2010, the team realized the 16 km quantum teleportation based on quantum entanglement distribution for the first time in the world. Based on the preliminary key technical preparations, at the end of 2011, the strategic pilot science and technology project "Quantum Science Experimental Satellite" of Chinese Academy of Sciences was formally established. In 2012, the joint research team of Chinese Academy of Sciences led by Pan Jianwei realized the first quantum entanglement distribution experiment of more than 102km in Qinghai Lake. In the experiment, the maximum attenuation is 80dB. On the one hand, it is verified that the entanglement characteristics still survive through the atmospheric channel on a larger scale, on the other hand, it is verified that the entanglement characteristics can be maintained under the condition of very large attenuation, which further verifies the feasibility of satellite-ground entanglement distribution.

In the following years, the team worked hard to overcome various difficulties and finally developed the "Mozi" quantum science experimental satellite. In the eyes of hundreds of millions of people, the Mozi was successfully put into orbit on August 16, 2016. After four months of on-orbit testing, it was officially delivered to carry out scientific experiments on January 18, 2017.

Mozi quantum science experimental satellite

As one of the three scientific experimental tasks of Mozi satellite, satellite-ground quantum entanglement distribution is the first quantum entanglement distribution experiment on the spatial scale in the world.

There are three optical payloads on the Mozi quantum science experimental satellite. Pairs of entangled photons are prepared by the quantum entangled light source and sent by two optical antennas. When the satellite transits the border, two telescopes point to Delingha and Lijiang ground stations respectively. The receiving systems of the two ground stations, according to the angular velocity of the satellite, make the satellite establish quantum channels with the two ground stations at the same time and send entangled photons to the ground stations.Then the ground station carries out entanglement measurement of photons, and if there are enough statistics, the Bell inequality can be verified.

In this experiment, the distance between the two ground stations is 1200 kilometers, the total distance from the satellite to the two ground stations is 2000 kilometers on average, the tracking accuracy of the ground station reaches 0.4 urad, and the receiving efficiency of the ground station system is more than 20%. The entanglement source on the satellite can generate 8 million entangled photon pairs per second, and the establishment of optical link can establish quantum entanglement between two stations over 1200 kilometers on the ground at the speed of 1 pair per second, so that a large number of statistical data can be obtained in a short time. If photons are transmitted by optical fiber over such a long distance, even if ultra-low loss optical fiber is selected, it will take 30 thousand years to distribute a pair of photons.

In the experiment, the two photons are pulled apart by a large enough distance, and at the same time, the high-precision experimental technology ensures that the independent measurement time interval between the two places is small enough, which meets the measurement requirements of "space-like interval" in Bell inequality measurement and closes the localization vulnerability and measurement selection vulnerability.The experimental results show that the standard deviation of 4 times violates Bell inequality, that is, the correctness of quantum mechanics is verified at a distance of thousands of kilometers with a confidence of over 99.9%.The nonlocality test of quantum mechanics which strictly satisfies Einstein’s localization condition is realized. This important achievement has laid a reliable technical foundation for the future experimental study of large-scale quantum networks and quantum communication, as well as the experimental examination of the basic principles of physics such as general relativity and quantum gravity in outer space.

Related achievements were published in the international authoritative academic journal Science in the form of cover papers.. In addition to the quantum entanglement distribution experiment, other important scientific experimental tasks of Mozi quantum science experimental satellite, including high-speed satellite-ground quantum key distribution, satellite-ground quantum teleportation and so on, are also under intense and smooth progress. It is expected that more scientific achievements will be released to the public one after another this year.

On November 28, 2016, at the Xinglong Observatory in Hebei Province, the "Mozi" quantum science experimental satellite transited.

Note:

[1]Bell inequality has many famous generalizations. Considering the practical factors of the experiment, five years after Bell inequality was put forward, John Clauser, Michael Horne, Abner Shimony and Richard A. Holt put forward a CHSH inequality, and the experiment of Bell inequality in later experiments was mainly to verify CHSH inequality.

[2] Space-like separation means that the space-time interval of two events satisfies that "it is impossible to communicate between two events with information below the speed of light.

Thanks to Associate Research Fellows Zhang Wenzhuo, Zou Mi and Li Dongdong of Hefei Microscale Laboratory of China University of Science and Technology for their help in writing this article.

　　On November 1st, the international version of Xingtu officially ushered in the market, and the price range of the new car was 228,900-238,900 yuan, with three versions. The new car will continue to be equipped with a 2.0T engine +8AT transmission, with a maximum torque of 400 N m.. Today, we will test drive this model and feel what upgrades and changes have been made in the international version of Starway Moon.

　　In terms of appearance, Starway Moon International Edition still adopts the family-style design style, but it has changed in some details. The biggest change is the use of a brand-new octagonal air intake grille with horizontal decorative strips, which looks domineering enough.

　　The light group adopts a penetrating design. When the lights are turned on at night, the middle light band will be lit. The position of the eyebrows of the headlights uses a blackened design, which also reflects the personalization of the car. In addition, chrome-plated decorative strips are added to the air inlets on both sides of the front bumper, which adds a lot of fashion to the car.

　　The shape change of the side of the car body is not great, and the through waistline design is still used, and the traditional door handle shape is retained, so the use convenience is still very high. In terms of body size, the length, width and height of the new car are 4970x1940x1792mm and the wheelbase is 2900mm respectively.

　　The shape of the rear end of the international version of Starway Moon Tour has not changed much, and the design of the through taillight group is still retained, which effectively increases the layering of the rear end. The rear bumper is decorated with a chrome trim strip, and equipped with a double exhaust layout, and the vertical reflectors on both sides are also preserved.

　　There is no change in the design of the interior, mainly reflected in some details, such as the addition of all-black color matching, which also provides consumers with more choices. In addition, the dual wireless charging panel of the new car is also decorated with suede, and the maximum power can reach 50W.

　　Although it is a fuel SUV, the car uses a two-spoke steering wheel, with bronze decoration and multi-function touch panel, as well as a panel with a sense of space, which enhances the luxury of the whole interior. Shift paddles are also reserved on the steering wheel, which can effectively improve the driving pleasure of the vehicle.

　　The international version of "Journey to the Moon" retains the penetrating triple screen design, and the 12.3-inch LCD instrument panel can display a lot of driving information of vehicles, including speed, driving mode, speed, entertainment information, navigation information, cruising range, etc., and the display clarity is still very high.

　　HUD head-up display is also very easy to use. When navigation is not turned on, HUD can display information such as vehicle speed and rotation speed. When navigation is turned on, HUD can display navigation information, including text and dynamic images, with good clarity.

　　Lion5.0 lion system will be used in the central control screen. The UI design of the whole screen is very user-friendly, and the delamination application is in place. The commonly used functions can be found at the bottom of the screen. The screen can support online navigation, online entertainment, mobile phone interconnection, voice interaction, OTA upgrade and other functions, which can fully meet our daily use.

　　The intelligent driving system of the new car can also be selected and set on the screen, and the whole interface is easy to understand. In addition, the air conditioning, seats and other functions of the vehicle are also placed on the screen, which can be controlled by voice or from the screen, and the sense of technology is still very high.

　　The sliding cover is still reserved in the central channel. After opening, the wireless charging panel of the mobile phone below is made of suede, which looks more advanced and feels very good. The maximum power of the wireless charging panel of the mobile phone is 50W, and a cooling vent is designed at the lower position, so that the mobile phone will not generate heat even if it is charged for a long time.

　　A small touch panel is also designed in the rear position. Here, it integrates the control of one-button start of the vehicle, double flashing, air conditioning air volume adjustment, defogging of front and rear windows, internal and external circulation, etc. It needs to be familiar with it for the first time, but the overall luxury temperament is still very good.

　　The car we test-drive today is a 6-seat model of the international version of Starway Moon. The seat configuration of the car is also rich enough. The front seats are not only equipped with electric adjustment, but also have functions such as seat heating, ventilation, memory and massage. At the same time, there are speakers in the headrest, which is more clear and specific when playing music or broadcasting road conditions.

　　The second row uses two separate seats, which are also electrically adjustable. Although the distance of the slide rail is not very long, it can also meet the riding needs of passengers in the second row or even the third row. The comfort of the second row of seats is also relatively high, and even if you ride for a long time, you won’t feel tired.

　　The third row of seats also uses two independent seats, the softness of the seat cushion is also very good, not as thin as expected, and the head and leg space is acceptable. The backrest is also designed with 5/5 points, all of which are manually adjusted, and the support of the backrest is average.

　　There is no change in the power of the international version of the Star Way Lunar Rover, and it is still consistent with the current models on sale. It uses a 2.0T engine with a maximum power of 261 HP and a maximum torque of 400N·m, which is matched with an 8AT transmission.

　　When we put this car on the road, the first thing that impressed us was not how strong the power was, but the suspension adjustment of this car. As a 6-seater /7-seater model, the suspension adjustment of the international version of Starway Moon Landing is soft, which can also handle the bumps on the road well and increase the comfort of the members in the car.

　　On the other hand, in terms of power, the new car is also equipped with a four-wheel drive system, so even in the economy and comfort mode, the power performance is relatively good, and the response time of the accelerator pedal is relatively fast. When we switch to the sport mode, the speed of the vehicle when shifting gears has changed obviously, and the feeling of shifting gears is also more obvious. Together with the use of shifting paddles, it also increases the driving pleasure of the vehicle to the greatest extent.

　　In terms of quietness, when the vehicle is driving at 80km/h, the control of wind noise and tire noise is very in place. However, when the vehicle speed is raised above 100km/h, the wind noise will increase obviously, but it is within the acceptable range. The tire noise and chassis performance are still excellent, and there is no sound coming out.

　　In terms of handling, although the car is large in size, the steering wheel is very flexible, even continuous line changing or one-handed operation can be easily completed. When turning around in a corner, the turning radius of the vehicle is quite satisfactory, but fortunately, the body is higher and it can have a better view.

　　The intelligent driving performance of the new car is also satisfactory, including ACC adaptive cruise, lane departure warning, rear car reminder and other functions are very easy to use, which also greatly relieves our fatigue when driving at high speed, and also improves the safety of the vehicle to a certain extent.

　　Summary:

　　As an SUV model for home use, Starway Moon International Edition has achieved the leading level of the same price in terms of appearance, interior technology, interior materials, intelligent driving performance and space. After all, the price range of this car is 22.89-23.89 million yuan, so it still has strong market competitiveness. So as a dad, will you consider this medium and large SUV?

　　[car home second-hand through train] Looking at the domestic SUV market, tanks are definitely one of the hot brands. Both (|) and Tank 500 have created sales records that demand exceeds supply, and even used cars are more expensive than new ones. Nowadays, the tank 800 frequently exposes spy photos. I believe that it is not far from you to leave the "Baoding Cullinan". But today, are the tanks 300 and 500 still so popular? Is the used car still so valuable? Let’s take a look at this issue together.

　　Different from Tank 300 and Tank 500, Tank 800 will be the flagship product of the "business luxury" route of tanks, and its design ideas will be more luxurious and atmospheric.

　　From the latest spy photos, we can see that the state of this vehicle is very similar to the version exhibited at the previous 2021 Shanghai Auto Show. We guess that the new car is also likely to be a tank 800 model close to the production version.

　　The more luxurious and atmospheric design is quite eye-catching, but besides the tank 800, the tank 300 and the tank 500 also have a very high degree of attention. If you want to be a "tank driver" earlier. Let’s take a look at the current market of tank 300 and tank 500.

　　The new cars currently on sale for Tank 300 are mainly two off-road models and three urban models, and the official version of Tieqi 02, which cooperates with Dinghuo. The official guide price ranges from 198,800 yuan to 302,800 yuan. As a hard-core off-road vehicle, this price range is still relatively close to the people, which is one of the reasons for achieving considerable sales.

　　However, since the second half of last year, the production speed of tank 300 has increased. Up to now, it is basically possible to pick up a car in about one month, and the popularity of new cars and the market for used cars of tank 300 have gradually declined.

　　Take the 2023 Conqueror version, which is more popular in the used car market, as an example. The guide price of a new car is 215,800 yuan, and a quasi-new car that has been licensed for about one year can basically sell for about 200,000-210,000 yuan. For the old conquerors around 2021, the second-hand price of standard car condition is around 190,000 yuan.

　　The standard car condition mentioned here is the normal kilometers of the car. In fact, as a hard-core off-road vehicle, the second-hand tank 300 can be said to be a car in one condition, not only to distinguish whether there is a history of off-road, but also to distinguish whether there is a modification.

　　In addition to post-modification, Tank 300 has introduced some original modified versions, such as Cyber Tank Edition, Border Limited Edition, Wind Forest Fighter, Tank Ranger and so on. Due to the official modification and limited sales, the prices of second-hand quasi-new cars of these models are basically 20,000-30,000 yuan higher than when the new cars land. However, with the continuous introduction of limited edition models and the decline in the popularity of new cars, the second-hand market of such models has gradually dropped.

　　Comparing the market, we can see that the tank 300 has indeed gradually reduced the heat and market from the previous "used cars are more expensive than new cars". However, in the same class and at the same price, Tank 300 is still the car with the highest rate of preservation and heat.

　　When considering used cars, it is recommended to consider quasi-new cars with short age and few kilometers. Although the price/performance ratio is not as high as that of old used cars, the problems reflected by the owners have been solved in the late batch, with better quality and more worry-free later. In terms of color, except for "Bai Fumei" and "I want red", they are basically popular colors with high preservation rate.

　　After talking about tank 300, let’s take a look at its "big brother" tank 500. In the eyes of many friends, tank 500 and tank 300 are also the light of domestic products. What about the second-hand market of tank 500?

　　The new tank 500 cars are mainly divided into Dengfeng/Terrace, Sport/Business, 5-seat /7-seat models, as well as the original factory’s special customized version with double colors. The price range of the new car is 335,000-395,000 yuan. However, in contrast, the new car sales of Tank 500 are not as high as those of Tank 300, and the second-hand market is relatively stable.

　　Take the sports version of the 7-seat environmental model as an example. The guide price of the new car is 363,000 yuan, and the new car is about 400,000 yuan. One-year-old second-hand quasi-new car, basically the purchase price is only 300,000 yuan, the individual transaction price is about 310,000-320,000 yuan, and the one-year preservation rate is about 80%.

　　Also affecting the current market of tank 500 is the launch of new models, namely the Hi4-T plug-in hybrid model. Before Tank 500, there was a lot of controversy about fuel consumption, and the Hi4-T plug-in hybrid model can solve everyone’s concerns about fuel consumption to a certain extent. Naturally, fewer people choose the 3.0T version, and the second-hand market will only fall but not rise.

　　Summary:

　　No matter the tank 300, the tank 500 or the future tank 800, they are all the benchmark products of China brand SUV. After the production capacity of tank 300 and tank 500 increased and the popularity of new cars gradually decreased, the market conditions gradually returned to normal. As consumers, we need to keep a clear head and rationally choose the right model according to our own needs.

　　Yiling police smashed "private detective company" dens. Photo courtesy of Yiling police

　　Zhongxin. com, Yichang, September 20th (Fu Wudi) Looking for a car, looking for someone, collecting debts, and checking the house … … The Public Security Bureau of Yiling District, Yichang City, Hubei Province reported on the 20th that its "2019 Net Action" task force successfully destroyed a "private detective company" and 10 suspects were criminally detained according to law.

　　In mid-June, 2019, an online inspection by the Netan Detachment of Yichang Public Security Bureau found that a WeChat account publicly posted an advertisement for finding someone to find a car, which was suspected of infringing citizens’ personal information, and authorized the Yiling District Public Security Bureau to file a case for investigation.

　　The police arrested the suspect. Photo courtesy of Yiling police

　　Yiling District Public Security Bureau set up a special investigation class to carry out the investigation. The police in the special class found out that the information came from a company called "Wuhan Veterans Survey" through online investigation and collection, offline waiting, follow-up investigation and evidence collection.

　　The police followed the line and found a 10-member criminal gang headed by Pan. Based in Wuhan, the gang collects citizens’ information and needs through the internet, and conducts illegal and criminal activities such as finding a car, finding someone, collecting debts, inquiring about household registration, and inquiring about house opening records nationwide.

　　The police found that Pan, the leader of the gang, was the boss of the company, responsible for personnel deployment, business negotiation, information coordination, remuneration collection, etc. The gang members Xu, Tao, Zhang and others were responsible for promoting the company’s business through the network and contacting the GPS salesman to maintain the background, install GPS, find people, find cars, track and shoot.

　　On September 2, the police of Yiling District Public Security Bureau wiped out 10 suspects, including Pan, in Wuhan and Xiantao.

　　At present, the case is still under investigation.

Su Jian zhi an〔2020〕123number

Housing and Urban-Rural Development Bureau (Project Construction Committee), Ecological Environment Bureau, Urban Management Bureau, Nanjing, Wuxi, Suzhou and Nantong Gardens (Municipal) Bureau:

In order to implement the Emergency Plan for Heavy Pollution Weather in Jiangsu Province, do a good job in classified control of dust pollution prevention and control on construction sites, implement the exemption policy for control and support the smooth progress of construction projects, according to the Emergency Plan for Heavy Pollution Weather in Jiangsu Province issued by the general office of the provincial government (Su Zhengban made [2019〕fiveNo.), the Provincial Department of Housing and Urban-Rural Development and the Provincial Department of Ecology and Environment jointly formulated the Emergency Work Plan for Dust Control on Construction Sites in Heavy Pollution Weather in Jiangsu Province (attached), and relevant local departments are requested to seriously implement it.

Contact: Xu Jiaxiang,025-51868699. Mailbox:707373088@qq.com.　

　

　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 Jiangsu Provincial Department of Housing and Urban-Rural Development　　 　　　　Jiangsu Provincial Department of Ecological Environment

　 　 　 　 　2020yeareightmoonsixsun　

(This piece is publicly released)

　

　

Dust from construction sites in heavily polluted weather in Jiangsu Province

Control emergency work plan (for Trial Implementation)

　

First, set the purpose

Implement the Emergency Plan for Heavy Pollution Weather in Jiangsu Province, establish and improve the working mechanism for dust prevention and control at construction sites in heavy pollution weather, and effectively control and reduce the impact of dust on air quality at construction sites.

Second, the basis for formulation

Notice of the State Council on Printing and Distributing the Three-year Action Plan for Winning the Blue Sky Defence War (Guo Fa [2018〕22No.), Notice of the Provincial Government on Printing and Distributing the Implementation Plan of Jiangsu Province’s Three-year Action Plan to Win the Blue Sky Defence War (Su Zhengfa [2018〕122No.), Emergency Plan for Heavy Pollution Weather in Jiangsu Province (Su Zhengban made [2019〕fiveNo.) and other documents.

Third, the scope of application

Dust prevention and control in the construction, reconstruction, expansion, landscaping and demolition of housing construction and municipal infrastructure projects in the province under the condition of heavy pollution weather.

Fourth, the working principle

Construction, urban management and ecological environment departments at all levels shall, under the unified leadership of the local people’s government, follow the principle of "graded responsibility, timely response, coordination and dynamic control".,Do a good job in the prevention and control of dust on construction sites in heavily polluted weather, respond to emergency warning in time, quickly implement emergency measures, strengthen communication and cooperation between departments, and improve joint prevention and control and rapid response capabilities. According to the early warning information, start the corresponding level of response, and make corresponding adjustments with the change of early warning information.

Five, early warning classification and emergency response measures

According to the Emergency Plan for Heavy Pollution Weather in Jiangsu Province (Su Zhengban made [2019〕fiveNumber), early warning from low to high is divided intoⅢ、Ⅱ、IThree levels are marked with yellow, orange and red respectively, and the red warning is the highest level.

(1) Yellow warning: predict the future.48Hourly air quality index of districts and cities (AQI) the average value is reached200Above, or monitoring to districts and cities.SO₂Hourly concentration reached500microgram/More than cubic meters, and did not meet the high-level warning conditions.

startⅢLevel emergency response, emergency response measures are as follows：

1. Increase the frequency of law enforcement inspections on construction sites;

2. Stop blasting, crushing, building demolition, concrete mixing without closure, and stop spraying and painting on outdoor construction sites and shotcreting on slope protection;

3. Earthwork excavation, road surface excavation, road surface washing and planing, earthwork transportation (except that it is transported by closed muck trucks above the national standard 5), floor garbage cleaning and mechanical operations such as crushing, cutting and sawing are suspended;

4. Increase the frequency of sprinkling water on the construction site to reduce dust, mechanically flush the roads at the entrance and exit of the construction site, and strengthen the coverage of the exposed ground that is not hardened, the material yard that is easy to raise dust, and the shutdown site (see Annex for coverage requirements, methods and scope)one）。

(2) orange warning:Predict future persistenceseventy-twoHourly air quality index of districts and cities (AQI) the average value is reached200Above, or monitoring to districts and cities.SO₂Hourly concentration reached650microgram/More than cubic meters, and did not meet the high-level warning conditions.

startⅡLevel emergency response, emergency response measures are as follows:

1. Increase the frequency of law enforcement inspections on construction sites;

2. Stop blasting, crushing, and concrete mixing without closure, and stop painting and shotcreting for slope protection in outdoor construction sites;

3. Except for livelihood security projects, other open-air demolition and construction site operations are suspended (continuous concrete pouring can be carried out normally for technical requirements);

4. Increase the frequency of sprinkling water on the construction site to reduce dust, implement mechanized flushing on the roads at the entrance and exit of the construction site, and strengthen the coverage of the exposed ground that is not hardened, the material yard that is prone to dust, and the shutdown site;

5. Transport vehicles such as bulk materials, coal, coke, slag, sand and earthwork are all prohibited (excluding ready-mixed commercial concrete and mortar, steel, etc.);

6. All fuel engineering machinery is stopped.

(3) Red warning:Predict future persistence96Hourly air quality index of districts and cities (AQI) the average value is reached200Above, or predict the future.24Hourly air quality index of districts and cities (AQI) the average value is reached450Above, or monitoring to districts and cities.SO₂Hourly concentration reachedeight hundredmicrogram/More than cubic meters.

startILevel emergency response, emergency response measures are as follows:

1. Increase the frequency of law enforcement inspections on construction sites;

2. Stop blasting, crushing, and concrete mixing without closure, and stop painting and shotcreting for slope protection in outdoor construction sites;

3. All open-air demolition and construction site operations are suspended (continuous concrete pouring can be carried out normally for technical requirements);

4. Increase the frequency of sprinkling water on the construction site to reduce dust, implement mechanized flushing on the roads at the entrance and exit of the construction site, and strengthen the coverage of the exposed ground that is not hardened, the material yard that is prone to dust, and the shutdown site;

5. Transport vehicles such as bulk materials, coal, coke, slag, sand and earthwork are all prohibited (excluding ready-mixed commercial concrete and mortar, steel, etc.);

6. All fuel engineering machinery shall be stopped (except for emergency rescue).

Early warning at all levels must strictly implement the emergency emission reduction measures for heavily polluted weather stipulated by the state and the province and other response measures specified in the emergency plan.

Construction sites and processes listed in the emergency control exemption list (see annex2), the operation can be carried out in accordance with the exemption management measures during the early warning period.

The early warning information of heavy pollution weather is released or released by the office of the provincial heavy pollution weather emergency command center, and the information is sent to the people’s government of the emergency response city, and the information is also released to the media and the public. The people’s governments of all districts and cities shall, according to the instructions of the Office of the Emergency Command Center for Heavy Pollution Weather or the changing trend of air quality in this Municipality, designate relevant departments to issue or remove early warning information for heavy pollution weather.

VI. Job Requirements

(1) Strengthen leadership and make careful arrangements.Construction, urban management, ecological environment and other departments at all levels should fully understand the importance of prevention and control of dust pollution in construction sites, do a good job in classified management and control, and implement the policy of exemption from management and control, not only to ensure the control of atmospheric environment, but also to support the smooth progress of engineering construction projects. It is necessary to do a good job in the classification and grading control of concrete enterprises, and ensure that the process requiring continuous concrete pouring can be carried out normally from the source. Local construction administrative departments should urge the construction site to take effective measures to realize "six hundred percent" of enclosure around the construction site, stacking and covering of dust-prone materials, wet earthwork excavation, road hardening, cleaning of vehicles entering and leaving, and closed transportation of muck vehicles, and install online monitoring and video monitoring equipment.

(two) rotating consultation, strengthen cooperation.The Provincial Department of Housing and Urban-Rural Development and the Provincial Department of Ecology and Environment have established a monthly rotating consultation mechanism to regularly communicate, exchange work information and study intersection issues. Departments of city construction, urban management and ecological environment can refer to this model, regularly strengthen research on issues of common concern and concern, and formulate scientific, reasonable and effective emergency control measures for heavy polluted weather while doing a good job in dust control at the construction site, so as to prevent frequent shutdown of the construction process and bring greater risks to safety production. Local construction administrative departments should master the management of construction sites during emergency control, assess the impact of heavily polluted weather on engineering construction, and report to the Provincial Department of Housing and Urban-Rural Development in a timely manner.

(3) Strengthen joint law enforcement and implement precise punishment.Local construction, ecological environment and urban management departments should make full use of the provincial comprehensive monitoring platform for pollution prevention and control, weave and compile the "tight encirclement" for monitoring environmental pollution, integrate online monitoring facilities of construction, urban management, ecological environment and other departments, further strengthen information sharing, and implement online dynamic management of pollutant discharge. To carry out joint law enforcement actions on a regular basis, the construction administration of each district and city.The competent department shall put forward the "six hundred percent" implementation requirements (see the annex for the "six hundred percent" implementation reference suggestions)three) to provide a basis for the subsequent implementation of joint precision law enforcement.The outstanding and difficult problems found in the inspection are entered into the comprehensive supervision platform, and the whole process is tracked and supervised to ensure timely rectification. Local construction administrative departments should increase the frequency of inspections during the emergency control of heavy polluted weather, and immediately order rectification if they find that illegal construction and dust control measures are not in place; It is necessary to urge construction units to strengthen dust prevention and control education; For construction sites that have not stopped or resumed work without authorization, severe punishment methods such as fines, notification, credit scoring, and restrictions on market access should be adopted to force the construction unit to implement the responsibility of dust prevention and control.

(4) Improve the positive incentive mechanism and implement differentiated management.Exemption policy is an important mechanism to encourage the development of environmental protection. Local construction administrative departments should urge construction enterprises and construction sites to strengthen pollution control, improve the pollution control level against industry benchmarks, and meet the conditions stipulated in the Administrative Measures for Exemption of Production Stop and Production Limit in Autumn and Winter in Jiangsu Province and Supplementary Notice on Strengthening Exemption Management of Production Stop and Production Limit in Autumn and Winter in Jiangsu Province, and encourage enterprises and project departments to actively submit exemption applications to local housing and construction departments. The construction department should take the lead in dynamic management of the exemption list of emergency management and control, include the qualified ones in the exemption list of emergency management and control, ensure that the incentive policies are put in place, and strengthen the clear orientation of "doing well is different from doing badly" in environmental protection. During the emergency exemption period, if any behavior contrary to the exemption conditions is found, the exemption qualification will be cancelled, and no application can be made again within six months. If the circumstances are serious, the relevant acts shall be carried out in accordance with the provisions of the housing construction credit score.

　

Attachment:1. Coverage requirements, methods and scope

2. Emergency control exemption process scope

3."Six hundred percent" implementation reference suggestions
attachmentone

　

Coverage requirements, methods and scope

　

I. Coverage requirements

Construction sites should strengthen management measures such as sealed storage or covering of cement and other fine-grained building materials that are easy to fly.Strengthen the coverage of exposed ground, material storage yard and shutdown site. Dust prevention measures such as dust prevention net covering and vegetation planting can be adopted for all kinds of exposed ground, mound and foundation pit excavation. Dust prevention net covering or vegetation planting should be adopted for vacant areas according to the service period and function. When building materials such as sand and stone and construction waste are piled in the open air, dust prevention net should be used for covering. For temporary construction, the exposed area and time of earthwork should be reduced as much as possible.

Second, the way of coverage

Dust-proof coverage in the construction area can adopt single coverage or composite coverage. Single coverage refers to the coverage method of using only dust-proof net, and the density of dust-proof net should be as dense as possible, and the dust-proof net with flat wire of more than four needles should be used for coverage to achieve the effect of dust prevention and dust fixation. By planting vegetation, before the greening effect is achieved, the dust-proof net should be used to cover it separately to form a composite cover, so as to achieve the effect of dust prevention and dust suppression. The dust-proof covering net in the construction area must be compacted firmly, which can play a good wind-proof and dust-proof effect in a certain period of time.

III. Coverage

In view of the shallow groundwater level in some areas of our province, the soil is sticky, the water retention is good, and the excavation is mostly wet soil, which is not easy to produce dust. In addition, the muck is generally covered with dense mesh, and the material is easy to age, the recovery rate is low, it is non-degradable, and it is easy to produce secondary pollution. Therefore, the covering requirements for the following procedures in the construction site are defined.

1. Requirements for muck covering in pile foundation engineering

Radius and periphery of working face of pile driver10-15mScope of the site, can not cover; The site should be paved with temporary roads, and the roads should be kept clean.

2. Requirements for muck coverage of foundation pit (trench) engineering

In the process of foundation pit (trench) excavation, the bottom of foundation pit may not be covered; If the foundation pit (groove) is sloping, the slope may not be covered; Parts involved in safety observation may not be covered; Hardened channels should be laid on the upper and lower ramps of the foundation pit, and the channels should be kept clean without covering the ramps; The wet muck can be stored in the shield tunnel section and the soil pit of the mining method tunnel without covering.

3. Requirements for muck coverage of municipal road engineering

Filler soil, waste soil and lime soil piled on site shall be covered; Earthwork or lime-soil subgrade shop48After hours, it has not been compacted, or the surface layer is dry and loose with dust after compaction, which should be covered; Water-stable inorganic binder base, after compaction, the surface layer is dry, loose and dusty, which should be covered; Effective dust prevention measures should be taken when dust-prone operations such as lime-soil mixing, pavement unification, cutting and chiseling are carried out.

4. Requirements for muck coverage of earthwork backfilling and greening in the later period.

Radius and periphery of mechanical working surface10-15mScope of the site, can not cover; After stopping the operation or after the completion of the operation, it should be in48Covering in time within hours.

5. Coverage requirements along the ground of high-speed rail or subway

In the construction site near the high-voltage catenary of high-speed rail or subway, the dust-proof net may be moved by typhoon, tornado and other forces, which may affect the safety of the high-voltage catenary. It is not appropriate to cover it with dust prevention net (refer to the relevant regulations of railway and subway protection zones for the safety distance), and it is appropriate to plant vegetation to achieve the effect of greening and solid settlement.

attachment2

　

Emergency control exemption process scope

　

On the premise of achieving excellent evaluation according to the Construction Site Dust Prevention and Control Inspection Scoring Form (see the attachment of Jiangsu Province Construction Site Dust Special Control Work Plan for details), the following procedures are exempted:

A, the main body and foundation construction

Underground waterproof construction, underground continuous wall grooving, scaffolding, formwork support and erection, steel binding, prestressed tensioning, component hoisting, lifting equipment dismantling, internal wall masonry, steel structure construction except painting, etc.

Second, building decoration and energy saving

Curtain wall installation, external wall plastering, external wall waterproofing, external wall thermal insulation, interior decoration and assembly decoration, etc.

Third, the building roof

Roof paving, waterproof and thermal insulation construction, etc.

Four, building water supply, drainage and heating

Water supply, drainage and heating construction of buildings other than ground-breaking operations such as outdoor trench excavation and backfilling.

Five, outdoor gardens and supporting facilities

Outdoor gardens and supporting line erection, installation, construction, etc. except ground-breaking operations such as outdoor trench excavation and backfilling.

VI. Urban Rail Transit Project

Underground excavation construction (shield, mining method), electricalSystem installation, underground track laying andConstruction requiring continuous operation due to the safety of process or surrounding environment and its upstream and downstream supporting operations.

Seven, municipal road and bridge engineering (including elevated section of track engineering)

Steel processing, formwork support, prestressing tendon tensioning and hole grouting, beam and slab hoisting and installation, etc.

Eight, pipeline engineering (including drainage, heating, gas, etc.)

Pipe jacking operation, trenchless pipeline repair construction, etc.

Nine, prefabricated buildings

The prefabricated assembly rate meets the Comprehensive Evaluation Standard for Assembled Buildings in Jiangsu Province (DB32/T　3753-2020) limit requirements of prefabricated building engineering construction (above the ground), etc.

X. Others

Water supply engineering, power supply engineering, electrical installation engineering construction, etc.; Road rescue projects due to road surface collapse or possible collapse accidents, emergency repair construction of drainage, heating and gas pipelines, etc.
attachmentthree

　

"Six hundred percent" implementation reference suggestions

　

First, the enclosure around the construction site is closed

oneConstruction sites in urban areas and built-up areas should choose enclosure types according to engineering characteristics to ensure enclosure tightness. Time limit exceededsixA month and don’t need to change frequently, should adopt a fixed enclosure with a closed bottom; Time limit for a project issixTemporary enclosures such as water yards can be used for those less than a month or those that need to be changed frequently on site.

2. Before the demolition, the demolition part shall be closed and fenced at the expropriation site where the household relocation is completed.

Second, the material stacking cover

one．Set up a special stacking area for easy-to-dust materials, so as to take them as you use them and cover them as you use them.

2Set up temporary garbage storage yard reasonably, and pile up construction garbage in a centralized and classified way.24If it cannot be removed in time within hours, dust prevention measures such as 100% coverage and sprinkling water shall be taken.

threeWet soil may not be covered, and the dried soil shall be cleaned, transported, turned over or covered in time. About wet soil (moisture content>5%) can be confirmed by observing that there is no obvious dust on the surface, squeezing free water or being able to twist and shape.

Three, earthwork excavation wet operation

oneDuring earthwork excavation, sufficient fog gun dust suppression equipment should be equipped, and the road should be cleaned, but water and ice should be prevented from causing potential safety hazards.

2For wet soil that does not produce dust, water spraying or spraying is not required. The specific judgment method is the same as above.

Fourth, pavement hardening

oneTemporary hardened pavement on the construction site shall be cast-in-place concrete or prefabricated panels that can be recycled.

2In the foundation construction stage, it is suggested to use temporary steel plates with satisfactory rigidity to harden the pavement, but it should be ensured that the temporary roads do not slip, dislocate or be damaged in use, and should be replaced in time after being damaged.

Five, in and out of the vehicle cleaning

one. All the body and wheels of engineering vehicles leaving the construction site should be cleaned, and equipped with automatic washing facilities. Only after washing can they enter the social road.

2Use information technology to strengthen supervision. For the construction site where the site conditions permit, it should be required to be equipped with vehicle unwashed capture equipment or video surveillance, and the relevant data should be pushed to the regulatory authorities with law enforcement power.

Six, muck vehicles closed transportation

Accelerate the upgrading of muck transport vehicles, and gradually force the use of closed muck transport vehicles (recommendedPvcFlat-push sealing mode) to solve the problems of vehicle overload, spilling and dripping.

The 2022 "Government Work Report" clearly pointed out that "resolutely prevent and correct employment discrimination such as gender and age, and strive to solve outstanding problems that infringe upon the legitimate rights and interests of workers." During the two sessions of the National People’s Congress, the "35-year-old threshold" became a hot topic of discussion among deputies.

Jiang Shengnan, a representative of the National People’s Congress, was quoted as saying: at the age of 35, he is in the prime of his career, and he is also in a difficult stage of his life, with the old and the young. It is neither scientific nor fair to exclude them with only one age limit, and it is a great waste of talents.

Whether you are a young person who has just entered the workplace or a senior migrant worker who has begun to be anxious about age, there are these data that you have to know about the middle-aged crisis of the "35-year-old threshold"-

01. How to deal with the middle-aged crisis in the involution era?

Involution and anxiety have always been symbiotic. Although the average life expectancy is getting longer and longer, Chinese’s anxiety about the middle-aged crisis is getting earlier and earlier. In a survey conducted by China Youth Daily, 71.4% of the respondents claimed that they were anxious about their working age. How to deal with it? 56.9% people said that they should use their expertise to seek a breakthrough, 56.4% people thought that their core competitiveness should be enhanced, and fewer people thought that they should change careers in time to find another way out after losing their age advantage.

02. In some factories, it is too late to be anxious until you are 35.

"35-year-old age anxiety" and "middle-aged crisis in big factories" have come into reality more and more by joking. 35-year-old has indeed become an age watershed in the workplace, especially in Internet companies. Even in some big factories, it is far from enough to start anxiety at 35. According to pulse statistics, as of November 2021, the median age of Didi employees is 33 years old, while Alibaba, Ant Financial and JD.COM are 32 years old, and Baidu and Ape Tutor are even more exaggerated to be 28 years old.

03. Are you anxious about your age under the "social clock"?

Older people often tell young people what to do at what age. Work, marriage, having babies … The world of adults seems to be locked in the established "social clock". Twenty or thirty years old should be the best time in my life, but the questions from netizens in Zhihu are full of anxiety. Is it too late to be married at 26? Can I still take the civil service exam at the age of 29? These problems reveal people’s growing age anxiety.

04. Should everyone follow the social clock?

It’s time to get married, to have children, and to do things at any age. The huge social habit force requires young people to follow the "social clock" to advance their lives. Once you don’t follow the clock, the anxiety of "step by step can’t keep up" will sweep through, and families, parents and themselves will not escape.

05. I feel anxious. I am the most active after learning a new career.

People who are engaged in the preparation of milk tea drinks are called bartenders; Courier and takeaway are collectively referred to as online delivery staff; Taobao anchor is a live salesman, and these "new occupations" are becoming a new choice for the public to choose a job. The nail platform conducted a sample survey on new vocational learning groups, and found that among these people, the post-80s and post-90s are the main force, accounting for 42% and 41% respectively, and their academic qualifications are mainly junior college and undergraduate. Among the respondents, the proportion of post-80s generation who encounter occupational crisis and bottleneck is also the highest.

　　On April 26th, local time, Argentine Economy Minister Felipe Massa held a press conference, announcing that Argentina would stop using US dollars to pay for goods imported from China and use RMB instead.

　　Zou Xiaoli, China’s ambassador to Argentina, was invited to attend the conference and delivered a speech. Argentine central bank governor Percy, Argentine General Administration of Customs Mitchell and entrepreneurs from China and Argentina witnessed the news release. Massa stressed at the meeting that the currency swap agreement between Argentina and China not only helps to strengthen foreign exchange reserves, but also helps to strengthen bilateral trade.

　　Massa said that after reaching agreements with different enterprises, Argentina will use RMB to pay for China’s imported goods worth about 1.04 billion US dollars this month. The use of RMB can accelerate the pace of Argentine imports of goods from China in the coming months, and the related authorization will be more efficient. It is estimated that starting from May, Argentina will also use RMB to pay for goods imported from China with the value equivalent to US$ 790 million to US$ 1 billion.

　　In addition, Massa also stressed that the use of RMB can increase the expectation of Argentina’s net foreign exchange reserves and bring greater freedom.

　　Zou Xiaoli, Ambassador of China to Argentina, said, "Strengthening economic and trade cooperation between China and Argentina is an important part of the comprehensive strategic partnership between the two countries. The economies of the two sides are highly complementary and have great potential for cooperation. China supports Albania’s efforts to maintain economic and financial stability, which is also reflected in the Sino-Arab joint statement issued during President Fernandez’s visit to China last year. China attaches importance to monetary and financial cooperation with Albania, and is willing to make joint efforts with Albania to encourage enterprises to use local currency for settlement in bilateral economy, trade and investment, reduce exchange costs and exchange rate risks, and create a good policy environment for promoting local currency settlement. In 2020, the People’s Bank of China and the Central Bank of Argentina renewed the local currency swap agreement, which played an important role in maintaining’s financial stability. The two central banks have also established an information exchange mechanism. China is willing to further strengthen local currency swap cooperation with Albania under the existing framework and support a greater role in the RMB clearing bank in Albania. China has confidence in Afghanistan’s financial and economic stability and the bright future of China-Arab cooperation. "

　　In January this year, the Argentine central bank said that Argentina and China had formally expanded the currency swap agreement, which would strengthen Argentina’s foreign exchange reserves of 130 billion yuan and activate the disposable quota of 35 billion yuan. (General Desk reporter Gong Xiangcheng)

Cctv news(Reporter/Written by Du Anqi/Kan Chunyu): "Cooking is too tiring, and the table is too expensive." During the Spring Festival, the business of home cooking is booming. CCTV News+reporter interviewed three chefs. In Jiuquan, Gansu, two tables of 18 dishes are charged in 500 yuan, and in the suburbs of Chongqing, a table of 13 dishes is charged in 300 yuan, but some chefs have received 2— A large-scale family banquet with three tables will earn five or six thousand yuan a day.

Two tables of New Year’s Eve dinner, 18 dishes charge 500 yuan

Repeatedly shirked, however, Wang Liping of Jiuquan, Gansu received an order for New Year’s Eve dinner. No way, the relationship needs to be maintained. Wang Liping is always asked to cook for the daily reception of the client company. This time, the client asked her to "help" during the New Year, and she could not refuse. The chefs in the team have all returned to their hometowns for the Spring Festival. Before that, Wang Liping had already cancelled more than a dozen orders.

Dinner will be served at 6:30 p.m., and Wang Liping needs to come home at 3:30 to prepare. Make a family dinner for more than 20 people in a family, set two tables, and serve 18 dishes, large and small, and charge 500 yuan. "On this single order, the customer is an acquaintance and there is no price increase." Wang Liping’s hands are tied, and she plans to let her husband go with her.

Wang Liping is not a professional chef. She has a regular job, and cooking at home is only a part-time job. At the beginning of 2023, she saw such a business model on social platforms. In March, she began to take orders, relying on her own home cooking skills and relying on the hard work of carefully pondering food videos. "Sometimes there are four or five orders a day, and sometimes there are no orders."

While taking orders, she runs her own social account and regards short videos as her own advertisements. Some people I know began to follow Wang Liping to take orders, and others found them from social platforms. Slowly, the number of orders and teams rose. At work, Wang Liping sends out the list, and at rest, he goes to the door to cook. Near the Spring Festival, "telephone calls for ordering food from all over the country are received from morning to evening".

Customers have different requirements. According to the quantity of food, Wang Liping charges 200— 300 yuan, a year down, she earn up to 7000 yuan a month. Wang Liping said: "No investment, low risk, free time, and hard money."

Make some pocket money for children by cooking at home.

Liu Li, who lives in the suburbs of Chongqing, received two orders on New Year’s Eve, and the customers prepared their own ingredients, a table of 10— 12 dishes, each door-to-door service 2— 3 hours, a day can earn more than 700 yuan’s manual fee. During the Chinese New Year, she raised the price of each order by 20%.

Before becoming a substitute chef for home cooking, Liu Li opened a beauty shop in the county town. In 2018, she had a child. Due to the pressure of rising rent and labor costs, she transferred the store. In 2023, she found that cooking at home can not only bring income, but also set aside time to pick up and drop off children and take care of housework.

On weekdays, Liu Li can pick up 3-mdash a day; Four orders, one for cooking, and the other for bacon soup pots, can earn seven or eight hundred yuan a day. Friends around her came to help, and she took out 30% as a commission.

Liu Li’s schedule is very full. After finishing the housework at home in the morning, she goes to the client’s house to cook, and she is busy until around 6:30 pm. After eating the New Year’s Eve dinner at home, she will continue to wash the dishes. "In fact, if you think about it, you have earned it by yourself. You have to rely on your own hands to do it. If you do it, you will get it."

Photo courtesy of respondents　

Earn five or six thousand dollars a day and go home to eat instant noodles

In contrast, He Xie’s team is larger and the charging standard is higher. "There are 50 chefs, including me, and the fees for chefs of different grades are different. Some are home-cooked dishes, some are star-rated products, and some are local specialty dishes, ranging from several hundred yuan to several thousand yuan." On New Year’s Eve, He Xie holds more than 60 home cooking orders, and the chefs in the team can earn up to five or six thousand yuan a day.

At the end of 2022, He Xie, who had worked hard in the catering industry for many years, noticed that cooking at home was on fire. He and his partners are planning to form a team. "Some of the chefs we recruited think that this industry is more promising, and some people have lost money in the catering business before and want to make some money."

In a year, the order volume has soared from a dozen orders a day to hundreds a day. "Many families pay more and more attention to health or the atmosphere at home, which is basically in a state of continuous growth." The monthly income of chefs in the team is 10 thousand — 30,000 yuan.

This time, He Xie and the team members made preparations from the twelfth lunar month to the fifteenth day of the first month: "The Spring Festival is our busiest time. We also hope to provide services to those families who need help and bring them warmth and joy. " Although his reunion with his family needs to be postponed, He Xie thinks it is very meaningful. "Most of the chefs in the team are men, and they are husbands and fathers in the family. In order to earn some money to subsidize the family and make the family live better, I will earn more money during the New Year."

Photo courtesy of respondents　

On New Year’s Eve, He Xie began to buy food at six o’clock in the morning and went to the customer’s house to start cooking at eight o’clock. 12— An order for 16 dishes often takes 4 hours. The latest table of New Year’s Eve dinner was set at 7: 00 p.m. He Xie still needed to clean up the kitchen. When he got home, it was already 10: 00 p.m. He didn’t want to fire again and bought a bucket of instant noodles to satisfy his hunger.

Although it is very hard, He Xie feels that his career is very valuable. "99% of the owners are very enthusiastic about us and will ask you if you drink water. Some people say that they can help us with chores and even let us eat together." At this moment, He Xie always feels very proud.

J.J.F. [2019] No.161

District Housing and Urban-Rural Construction Committees, Dongcheng and Xicheng District Housing and Urban-Rural Construction Committees, Construction Bureau of Economic and Technological Development Zone, construction enterprises and relevant units:

　　In order to implement the decision-making arrangements of the Beijing Municipal Party Committee and Municipal Government to optimize the business environment, effectively promote the "streamline administration, delegate power, strengthen regulation and improve services" reform of the construction industry, and improve the efficiency of administrative examination and approval, the Municipal Housing and Urban-Rural Development Committee aims at "more data running, less people running errands", uses the "Internet+government service" working mode, and applies technical tools such as electronic signature and QR code. Since April 15, 2019, construction enterprises registered in the administrative area of this Municipality have gradually implemented electronic safety production licenses.

　　First, the scope of application of electronic certificates

　　Safety production license certificate registered in the administrative area of this municipality with the permission of Beijing Municipal Commission of Housing and Urban-Rural Development.

　　Second, the electronic certificate style

　　The electronic certificate is in PDF format with the electronic signature of the special seal for administrative examination and approval of Beijing Municipal Commission of Housing and Urban-Rural Development as the carrier, and the certificate specification is A4 (vertical version, see annex for specific style).

　　There is no original or duplicate of an electronic certificate, and the information carried by the certificate includes certificate number, enterprise name, unified social credit code, principal responsible person, unit address, economic type, license scope, validity period of safety production license, certificate status, verification QR code, electronic signature of issuing institution, and remarks.

　　Third, the acquisition and use of electronic certificates

　　(A) the way to obtain electronic certificates

　　Construction enterprises in this Municipality can download and print the electronic certificate of safety production license by themselves through the "Safety Production License Approval" system of the Municipal Housing and Urban-Rural Construction Committee. (Website: http://zjw.beijing.gov.cn/)

　　(B) the use of electronic certificates

　　Construction enterprises should hold their own printed safety production licenses and affix their official seals when handling projects bidding, construction permit procedures or project safety supervision and filing. The project construction unit or the relevant competent business department can verify the self-printed safety production license information by querying the official website of the Municipal Housing and Urban-Rural Development Committee or scanning the QR code at the lower left of the certificate, and it will be valid only when the safety production license information is completely consistent with the online publicity information and the certificate status is "valid".

　　(3) Verification methods of electronic certificates

　　1. Verification of official website: Units or individuals who use safety production licenses can check and verify through the "Inquiry Center" column on the official website of Beijing Municipal Commission of Housing and Urban-Rural Development. (Website:

　　http：//zjw.beijing.gov.cn/bjjs/bszn/cxzx)

　　2. QR code verification: scan the QR code at the lower left of the safety production license to view the detailed information and status of the safety production license.

　　(D) Dynamic management of electronic certificates

　　1. Construction enterprises will not be able to download and print safety production licenses by applying for "electronic certificate printing of safety production licenses" in the following circumstances:

　　(1) The enterprise’s safety production license is cancelled or revoked;

　　(2) The enterprise is temporarily detained by the Municipal Housing and Urban-Rural Development Committee due to illegal acts, and the safety production license is temporarily detained.

　　During the temporary suspension of the enterprise’s safety production license, the status of the safety production license verified by the two-dimensional code of the safety production license or publicized online is "temporary suspension", and the safety production license cannot be used normally.

　　2. When the company name, principal responsible person, unit address, economic type and other information changes, the construction enterprise shall handle the business of changing the safety production license in time to ensure that the online publicity information is updated in time.

　　3. The safety production license information shall be subject to the online publicity information of the Municipal Housing and Urban-Rural Development Committee. If the self-printed safety production license is inconsistent with the online publicity information, it shall be regarded as forged. Construction enterprises should properly keep the electronic certificate of safety production license of their own units to prevent other units and individuals from fraudulently using or tampering with it.

　　Fourth, the transition period

　　1. Since April 15, 2019, the city has started to implement the electronic certificate of safety production license, and the Municipal Housing and Urban-Rural Development Committee will no longer issue paper-based safety production licenses.

　　2. The Municipal Housing and Urban-Rural Development Committee will no longer handle the three businesses of "replacement of the original and duplicate of the safety production license for construction enterprises", "construction enterprises increase the duplicate of the safety production license" and "construction enterprises lose the original and duplicate of the safety production license". Construction enterprises can obtain the electronic certificate of safety production license by applying for the business of "printing electronic certificate of safety production license".

　　3. Since April 15, 2019, the construction enterprises in this Municipality have handled the business related to safety production licenses (except for "re-approval"), and all the electronic certificates will be renewed after approval. During the validity period, the paper version of the safety production license will continue to be valid, and enterprises can voluntarily apply for the replacement of the electronic certificate. After the replacement, the original paper version of the certificate will be invalid.

　　I hereby inform you.

Beijing Municipal Commission of Housing and Urban-Rural Development

March 29, 2019

　　(Contact: Chen Nana, Yu Jian; Tel: 55597178, 55597177)

　　German researchers reported in the new authoritative academic journal Nature that they found a natural antibiotic in human nasal cavity, which can kill methicillin-resistant Staphylococcus aureus (MRSA), which is called "superbacteria" and is resistant to many antibiotics.

　　Researchers at the University of Tü bingen, Germany, found in the study of 187 hospitalized patients that a bacterium named Staphylococcus ludden rarely appeared with Staphylococcus aureus in the nasal cavity of patients. When the patient has Staphylococcus aureus in the nasal cavity, the rate of Staphylococcus aureus in the nasal cavity is only one sixth of that of the patient without Staphylococcus aureus in the nasal cavity. Further research shows that Staphylococcus ludden can produce a previously unknown natural antibiotic, which makes Staphylococcus aureus unable to survive in human nasal cavity. The researchers named it "Ludenin".

　　Animal experiments have shown that Luteinin can kill MRSA, vancomycin-resistant enterococci and other multi-resistant bacteria resistant to traditional antibiotics. For example, the ointment made of Ludwig successfully cured MRSA skin infection in mice, and Ludwig spray greatly reduced the number of MRSA in the nasal cavity of rats. The researchers say that antibiotics are usually produced only by bacteria and fungi in the soil, and it is a new discovery that human flora can also be a source of antibiotics. Next, they will focus on the application of ludenin, such as trying to implant ludenin-producing bacteria into high-risk patients to reduce the risk of MRSA infection.

　　Jim Lewis, a microbiologist at Northeastern University in the United States, said that this is the first time that scientists have made it clear that antibiotics produced by one bacterium can inhibit the existence of another bacterium in the same microbial community. Researchers believe that new discoveries will help to prevent and treat drug-resistant bacterial infections in the future, and also provide new ideas for finding new antibiotics in the future.