IC800SSI107RP2理设施应用分析技术及特点怎样判别数据冷热；冷热数据别离怎样触发；冷热数据别离怎样结束；冷热数据怎样运用。下面就针对这4个方面进行阐.2.1.1 怎样判别数据冷热常见的判别办法是，依据主表中的一个或几个字段来判别。比方在工单体系中，能够运用工单状况、客服究竟操作时刻来作为冷热数据的判别条件，将现已封闭的而且超越一个月的工单视为冷数据，其他的工单视为热数据。
在判别冷热数据中，咱们应遵循以下原则：
数据一旦被搬迁到冷库中，就代表事务代码只能对它进行查询操作；
冷热数据不能一起读取。
3.2.1.2 冷热数据别离怎样触发
触发冷热数据别离的办法有三种：在批改操作的代码后边加上触发冷热别离的代码、监听数据库改动日志、守时扫描数据库。针对这三种办法来一一阐明。

在批改操作的代码后边加上触发冷热别离的代码
在每次批改了数据后，都会触发实施冷热别离的代码。这种办法比较简单，每次只需求判别以下是否变成了冷数据即可，虽然能确保数据实时性，可是无法依照日期时刻来差异冷热数据，而且全部与数据批改相关的代码都要加上冷热别离代码。因而这种办法运用的较少，一般用在小型体系上。
监听数据库改动日志
这种办法需求创立一个新服务来监听数据库改动日志，一旦发现相关的表发生了变动就触发冷热别离逻辑。这种办法又分为两种子办法，一个是直接触发冷热别离逻辑，另一个是将表更的数据发送到部队里（能够是自定义的公共 List，也能够是MQ），订阅放从部队中获取到数据后实施冷热别离逻辑。这种办法的利益是与事务代码完全解耦，低推延，可是缺点和办法一相同无法依照日期来差异冷热数据，而且会呈现事务代码和冷热别离逻辑代码一起操作同一条数据的问题，也就是并发问题。
守时扫描数据库
这种办法也是新建一个服务，守时扫描数据库。一般咱们会运用使命调度渠道来结束，或许经过第三方开源的库/组件来结束，当然，假定你乐意也能够经过编写操作体系守时使命来结束。这种办法的利益是与事务代码别离，而且能够依据日期时刻差异冷热数据，缺点是无法做到实时性。
依据上面三种办法的描绘来看，工单体系适合运用守时扫描数据库的办法来结束冷热别离。

3.2.1.3 冷热数据别离怎样结束
现已有了冷热数据别离的处理计划了，那么在这一末节里咱们来看看怎样结束冷热别离。
结束冷热别离的底子进程如下：
With the continuous improvement of electrification, the railway has been reshaped as a sustainable and energy-saving transportation mode. ABB has actively participated in the construction of rail transit in China, providing a solid and reliable power guarantee for AC / DC substations, passenger station buildings, control and signaling devices, tunnels, locomotives and rolling stock, and promoting the interconnection between provinces and cities. Successful projects include Beijing Shanghai high speed railway, Qinghai Tibet railway, Beijing, Shanghai, Guangzhou, Changsha and many other rail transit projects. As abb capability ™ As part of the building ecosystem of the building ecosystem, the "new building ecosystem" partner program provides a collaborative way to enter the market for suppliers engaged in sustainable development, energy management and decarbonization solutions in the field of commercial buildings.



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The "new building ecosystem" partner program is realized through a digital, scalable and open platform to accelerate the benefits of ABB customers and provide solution suppliers with opportunities to realize their unlimited potential.



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The partnership program will have a positive impact on the environment by maximizing energy efficiency and sustainable solutions. The program aims to provide solution suppliers in the commercial construction sector with the opportunity to join ABB capability ™ Building ecosystem is an opportunity to jointly promote the decarbonization and sustainable development of the construction industry. Carbon emissions from commercial buildings account for more than 10% of the global total greenhouse gas emissions. For enterprises and stakeholders in the field of commercial buildings, it is urgent to solve the problem of building decarbonization ABB ability ™ The building ecosystem brings together a complete set of affordable and intuitive software and hardware to simplify the implementation of sustainable buildings. This open platform provides customers with a cross system global perspective, so as to better help users make decisions. At the same time, the platform also has system interoperability and scalability.





Members of the cooperation program will have the opportunity to build on ABB openbos. ABB open building operating system can handle complex integration tasks and help partners simplify the deployment of their solutions. The "new building ecosystem" partnership program also aims to become a growth accelerator for software and Internet of things (IOT) innovators, supporting innovators engaged in sustainable development, energy management and decarbonization solutions in the field of new and renovated commercial buildings. The "new building ecosystem" partner program also provides a variety of options for software partners to become ABB capability ™ Building ecosystem is a part of building ecosystem. The scope of cooperation covers the promotion of a range of solutions, including ABB capability ™ Supplement to existing solutions on the marketplace digital solution subscription platform, and supplier solutions and ABB capability on the open platform ™ Building ecosystem is a solution for building ecosystem integration.



New building ecosystem "partner program with abb capability ™ Based on the building ecosystem and the concept of vendor agnostic, the building ecosystem further breaks the technology island in the building system through the collaboration platform of application programming interface (API). Each partnership will maximize energy efficiency and promote sustainable development through the adoption of technologies that reduce costs and have a positive impact on the environment. Jointly promote the decarbonization and sustainable development of the construction industry. Carbon emissions from commercial buildings account for more than 10% of the global total greenhouse gas emissions. For enterprises and stakeholders in the field of commercial buildings, it is urgent to solve the problem of building decarbonization ABB ability ™ The building ecosystem brings together a complete set of affordable and intuitive software and hardware to simplify the implementation of sustainable buildings. This open platform provides customers with a cross system global perspective, so as to better help users make decisions. At the same time, the platform also has system interoperability and scalability.





Members of the cooperation program will have the opportunity to build on ABB openbos. ABB open building operating system can handle complex integration tasks and help partners simplify the deployment of their solutions. The "new building ecosystem" partner program also aims to become a growth accelerator for software and Internet of things (IOT) innovators, providing support to innovators engaged in sustainable development, energy management and decarbonization solutions in the field of new and renovated commercial buildings. The "new building ecosystem" partner program also provides a variety of options for software partners, making them ABB capability ™ Building ecosystem is a part of building ecosystem. The scope of cooperation covers the promotion of a range of solutions, including ABB capability ™ Supplement to existing solutions on the marketplace digital solution subscription platform, and supplier solutions and ABB capability on the open platform ™ Building ecosystem is a solution for building ecosystem integration. Thorsten Mueller, head of ABB's global product group for electrical building and home automation solutions, said, "we need to meet the changing needs of our customers with continuous innovation and creation." the "new building ecosystem" partner program reflects the transformation of our thinking on the digital transformation and decarbonization of the commercial construction industry. It emphasizes ABB's commitment to the future of collaboration, openness and vendor agnostic. This partner program will witness the most innovative and sustainable solution technology suppliers in the field of commercial construction using ABB capability ™ The scale and business opportunities of building ecosystem. This will help to accelerate the reduction of energy consumption in new and renovated buildings. " ABB Ability ™ Based on the building ecosystem and the concept of vendor agnostic, the building ecosystem further breaks the technology island in the building system through the collaboration platform of application programming interface (API). Each partnership will maximize energy efficiency and promote sustainable development through the adoption of technologies that reduce costs and have a positive impact on the environment.



Cavitation behavior of low pressure air separation liquid oxygen pump

In the full low pressure air separation unit, it is sometimes found that the outlet pressure of the centrifugal liquid oxygen pump drops suddenly, and the liquid oxygen cannot be discharged, and the liquid oxygen pump cannot continue to work. This phenomenon is often called "air entrainment". This phenomenon of "air entrainment" in liquid oxygen pump is called "cavitation" in professional terms. Principle of cavitation phenomenon in 2 liquid oxygen pump

Factor 1: when the pressure of the liquid is lower than the corresponding saturated vapor pressure, the liquid will vaporize. This situation is easy to occur in the cryogenic pump. When the liquid pressure at the inlet of the impeller blade is reduced to equal to the saturated vapor pressure of the liquid at the temperature, the liquid oxygen begins to boil and vaporize, and bubbles are generated in the liquid. The liquid with bubbles flows along the centrifugal force direction of the impeller. When it reaches the area where the pressure in the impeller rises (that is, the pressure outside the bubble is higher than the corresponding vaporization pressure area), the steam is cooled again. Due to the great pressure outside the bubble, when the bubble condenses, the surrounding liquid rushes to the space occupied by the bubble at a very high speed, causing local impact on the surface of the impeller in this area (i.e. strong water hammer). This is commonly known as the cavitation phenomenon of liquid oxygen pump. Factor 2: cavitation may also occur when the pressure of the main condensing evaporator decreases, the liquid oxygen inlet filter is blocked, and the inlet pipe resistance increases.

3. Harmfulness of cavitation of liquid oxygen pump.

The influence of cavitation on liquid oxygen pump varies with its degree. When the degree of cavitation is not serious, the impact is small. If the cavitation reaches a certain degree, many bubbles will be generated at the inlet of the working wheel blade. These bubbles will condense into liquid as the liquid enters the place with high pressure (at the outlet of the working wheel), and the bubbles will burst rapidly. Because the density difference between gas and liquid is hundreds of times, when liquid oxygen condenses, the volume suddenly shrinks, and the surrounding liquid rushes to the bubble position at a high speed, causing the impeller surface in contact with the bubble to be violently impacted. It not only makes the flow, head and efficiency of the pump drop sharply, but also destroys the continuity of the liquid flow, and makes the surface of the impeller, guide wheel and pump shell appear dents and micro cracks; Chemical corrosion may also occur where gas impacts occur. Therefore, all efforts should be made to avoid cavitation of the liquid oxygen pump.

4 consideration of avoiding cavitation

In order to avoid discrimination, liquid oxygen is often supercooled when entering the pump, so as to reduce the possibility of liquid vaporization in the pump. If the inlet pressure of the liquid oxygen pump is increased, the saturation temperature of the liquid oxygen will be increased and the liquid oxygen will have a certain degree of supercooling. Generally, the installation position of the liquid oxygen pump is lowered to increase the inlet pressure of the liquid oxygen pump (even if there is a certain static head at the liquid oxygen inlet) and improve the undercooling (the undercooling is considered to be 6 ℃ ~10 ℃ in the design). For example, when the pressure of liquid oxygen in the main condensing evaporator is 0.04MPa, its saturation temperature is 94K. When the inlet pressure of the liquid oxygen pump increases to 0.09mpa due to the static pressure of the liquid column, its saturation temperature is 97k, which is equivalent to that the liquid oxygen has obtained a 3 ℃ undercooling degree. In addition, attention shall also be paid during operation: the liquid oxygen adsorber shall be thoroughly precooled before being used until the liquid is discharged; Do not rush to close the bypass valve. Once cavitation occurs, exhaust immediately to ensure the safe operation of the liquid oxygen pump. In order to improve the anti cavitation ability of the liquid oxygen pump, the spiral or axial-flow inducer is installed in front of the working wheel in the structure at present to "remove the middleman from the outside and remove the heat insulation wall from the inside". This is Zhang Ruimin's brief summary of organizational structure adjustment. The insulation wall is the middle-level manager. It quoted Charles Handy, a management master, as saying, "the middle layer of the enterprise is a group of roasted geese. They have no nerves and will not reflect the market situation. According to Haier's plan, Haier laid off about 26000 people last year and this year.



Over the years, home appliances belong to large-scale manufacturing and labor-intensive industries. Many home appliances are produced by manual assembly, which requires not only a large number of front-line industrial workers, but also production management personnel for management. According to Xu Feng, in the traditional production process, the ratio of workers to management posts is 1:10, that is, 10 workers are equipped with one management post. If the front-line team leaders are included, this ratio can reach 1:5. Previously, in industries with a high degree of automation, such as automobiles and FMCG, one worker may manage one line, and the number of managers has also been greatly reduced. The ratio of 1:20 management posts is a common allocation level.



Nowadays, the transformation and upgrading needs faced by the home appliance industry are not only Haier, but also home appliance enterprises such as Gree and Hisense have invested a lot of money in automation transformation. For enterprises, this may be the optimization result of reducing costs and improving efficiency. But for employees, this year's jobs may be "optimized" tomorrow, which is not only the reality faced by front-line industrial workers, but also the management. According to Xu Feng, in the manufacturing process, generally speaking, ordinary industrial workers are the first to be eliminated, followed by ordinary skilled workers, senior skilled workers and technical personnel managers.



Transformation should also inject "new blood"



As far as employees are concerned, they may have to worry that even though some posts will not be abolished, the post personnel still need to be replaced. For example, middle-level managers used to be extensive management, but turned to lean production management. "In the past, it was guided by task completion to implement the plan, and then it was transformed into fine management. Management posts should better understand the needs of automated management, such as rapid line transfer, inventory management, employee skill training, etc." Xu Feng said that the staffing needs to meet the needs of the company's core business. Some will be reduced and some will be increased.



Transformation is not only a challenge to enterprises, but also a challenge to employees. Wang Pu, President of Peking University Zongheng management consulting company, described the two most common layoffs. He said that a porter may be laid off due to physical reasons or stronger workers; Mechanical equipment may also be used at the wharf to replace the porters. The porter should do two things: exercise to keep himself strong; Go to learn mechanical knowledge immediately. It is reported that in the process of enterprise automation transformation, the most scarce is automation talents with equipment transformation or process transformation ability.