The drainage principle of gravel filter
The inverted filter layer was made of 2 - 4 layers of sand, gravel, pebbles, and other materials with different particle sizes. The particle size was graded from fine to coarse along the direction of the water flow. The principle of drainage was that when the permeating water passed through the inverted filter layer, because the particle size of each layer gradually increased along the direction of the water flow, the particles of any layer were not allowed to pass through the pores of the adjacent thicker layer, and the particles of the same layer could not move relatively. In this way, the water flow could pass smoothly, and at the same time, it could prevent the soil in the dam body or foundation from being brought out by the permeating water, thus realizing the drainage function and preventing the occurrence of piping and flowing soil. Read more exciting novels for free
Reflection principle of filter
The reflective filter is composed of loss-free reactor components (such as inductors, condensers, or their combined network). The principle was based on reflecting interference waves of unwanted frequencies back to the signal source to achieve frequency selection and filtering purposes. In the design, the filter should have a low series resistance and a high parallel resistance in the band-pass range, and the parallel resistance in the stop-band range should be very small and the series resistance should be very high. When the electromagnetic interference spectrum emitted by the interference source is wider than the received signal spectrum, the receiver will receive the interference signal when it receives the useful signal. The reflection filter can reflect the stopband frequency back to the signal source, limit the frequency band of the received signal, suppress the useless interference without affecting the useful signal, thereby improving the signal-to-noise ratio of the receiver and significantly reducing the level of conducted interference. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Working principle of Chifeng carbon steel backwashing filter
The working principle of the carbon steel backwashing filter was as follows: water enters from the entrance, first passes through the coarse filter to filter out the larger particles of impurities, and then reaches the fine filter. During the filtering process, the fine filter gradually accumulated dirt and impurities in the water, forming a filter impurity layer. As the impurity layer accumulated on the inner side of the fine filter, a pressure difference was formed on the inner and outer sides of the fine filter. When the pressure difference of the filter reaches the pre-set value, the automatic cleaning process will begin. During this time, the clean water supply will be continuous. The cleaning valve will be opened, and the water pressure in the cleaning room and the sewage suction device will decrease greatly. Through the pressure difference between the filter cylinder and the sewage suction pipe, a suction force will be generated between the sewage suction pipe and the cleaning room through the suction mouth, forming a sewage suction process. At the same time, the electric motor drove the sewage suction pipe to do a spiral movement along the axis. The combination of the axial-direction movement and the rotating movement of the dirt sucker completely cleaned the inner surface of the entire filter screen. The entire rinsing process only took tens of seconds. The drain valve closes at the end of the cleaning and the filter begins to prepare for the next flushing cycle. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
A Gravel of Sand
Based on the information available, Yi Lisha's novels included " Moonlit Night Flower Dynasty,"" His Little Princess,"" Touching the Heart," and " When the General Comes to Dream," but he did not find his latest novel collection. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Open ditch drainage and underground ditch drainage
Open ditch drainage and underground ditch drainage were two different drainage methods. Open ditch drainage referred to the drainage of water through the excavated open ditch channel. Water could flow directly from various positions in the ditch. The cover was usually a comb, which could pass water. The comb or grill was used to intercept debris. Underground ditch drainage meant that water could not flow in directly. The cover was usually steel plate or concrete. The drainage ditch of the underground ditch was inclined to the water collecting well. When digging, the drainage ditch was first dug, and as it was dug, it deepened to form a underground ditch system connecting the inside and outside of the foundation pit to control the underground water level. Finally, the underground water was pumped away by a pump. Open ditch drainage was suitable for irrigation in areas with water infiltration, and it had a good effect on rainwater drainage. Dark ditch drainage was suitable for the foundation pit drainage of structures with large foundation pit depth, narrow site, and strong underground water.
Open ditch drainage and underground pipe drainage
Open ditch drainage and underground pipe drainage were two common methods of farmland drainage. Open ditch drainage was a method of digging drainage ditches to form a drainage ditch network. Water would flow from the field ditch network into the water transmission ditch network and finally into the drainage area (river, lake, sea). Underground drainage was a method of burying pipes underground to drain water by removing excess water from the farmland soil and lowering the water level. The underground pipe drainage could be used to filter and seep water by using sand and stone bedding, laying thick plastic pipes and crushed sand. Open ditch drainage was suitable for soil layers with better geological conditions, while underground pipe drainage could effectively control the underground water level, save land, and have a better drainage effect.
Open ditch drainage, underground ditch drainage
Open ditch drainage and underground ditch drainage were two different drainage methods. Open ditch drainage referred to the digging of open ditches on the surface to guide water to the water outlet. It was suitable for draining accumulated water after heavy rain or for green areas with uneven terrain. Open ditches had the advantage of easy drainage, easy flushing, and anti-blockage, but there might be problems with odors and pests, and it would also make the ground uneven. Underground ditch drainage was used to draw water out by burying pipes or building underground ditches. It was suitable for narrow sites and large underground water. Underground ditches could keep the terrain neat and save land, but the cost was higher. There were differences in drainage methods, cover materials, and functions between open ditches and underground ditches.
promotion and drainage
The following are some common methods to promote drainage: 1. ** Social media promotion **: It has a wide coverage and low cost, but the content must be attractive and know how to interact with users. 2. ** Online advertisement promotion **: Able to accurately target users, but the advertising cost is high. You must choose the platform and strategy carefully. 3. ** content marketing **: It helps to build user trust and improve brand image. It requires high-quality content and continuous updates. 4. ** Promotional articles **: It can influence users subtly. You need to find a suitable platform and channel. 5. ** Q & A Promotion **: Answer user questions through the Q & A platform and provide valuable answers to increase brand exposure and user attention. High-quality content can show long-term promotion effects. 6. ** We-media Channel Promotion **: Use the We-media platform to spread original and high-quality content to attract users 'attention and improve the brand image. 7. ** Video Promotion **: Create high-quality and highly relevant video content and upload it to the video platform. Use the Short videos traffic and exposure to promote it. 8. ** WeChat marketing **: Use WeChat's various functions to push promotions and event news to increase user participation. 9. ** domestic APP advertising promotion **: Placing promotional content in the advertising space of popular APP platforms to accurately reach the target users. 10. ** Information flow advertisement promotion **: Placing information flow advertisements on online media, social media, and other platforms to accurately reach users and increase brand awareness. 11. ** Community Promotion **: Create a community around your own industry and organize regular activities to attract target users to participate in interactions. 12. ** Resource Cooperation Promotion **: Cooperate with other websites in terms of resources, such as links, advertisements, content, etc., to achieve mutual promotion. 13. ** Fission Marketing Promotion **: Through the reward mechanism and user recommendations, users can promote themselves, increasing user conversion and brand communication. 14. ** Weibo Promotion **: It is highly open. You need to continuously output content and use functions such as reposting and lottery to attract fans. 15. ** Peers recommend each other **: Find similar industries to promote to each other to obtain more accurate customer resources. 16. ** Bait Techniques **: For example, mention valuable content in the community to attract others to add, or upload attractive resources on well-known websites to attract interested people. 17. ** Mass posting **: For example, using the number advantage of the WeChat group to increase the exposure of the content. 18. ** Enterprise WeChat Promotion **: Use various marketing tools of Enterprise WeChat for marketing. You can import mobile phone numbers to add users. 19. ** Matrix keyword promotion **: For example, restaurants can publish information with specific keywords (such as local food) on platforms such as Little Red Book. 20. ** Create a unique charm and build an IP (as in TikTok)**: Build a unique personal or brand IP to attract fans. 21. ** Livestream interaction (as if on TikTok)**: Build private domain traffic through livestream. 22. ** Online and offline integration (as in TikTok)**: Combining offline activities for online promotion. 23. ** For the mall's Mini programs **: It has a beautiful interface design and rich product content. Through cooperative promotion (with relevant platforms, social media, and blog, etc.), it uses special promotions, lucky draws, and offline promotion and event traction.
A novel written by gravel
I recommend a few super interesting novels. " Turning Stones into Spirits " was a modern romance novel written by Little Wood Canxue. The protagonist wanted to change his unhappy life, and he had a special ability to collect all the rare treasures. There was also an interesting interaction with a beautiful man. The story was super exciting. " The Story of Planting Stones " was an oriental fantasy novel by Lost Gaga. The modern female Lin Hui was reborn in a different world because of a stone. The stone became a birthmark. She went from weak to strong and attacked the peak of the world's power. What would happen if she planted a stone was very curious. The novel," Beginning from the Old Nine Gates," was a novel about the infinite heavens. Chen Yuan was reborn and showed his talents in the worlds of the Old Nine Gates, Grave Robber's Chronicles, Resident Evil, and other worlds, exploring the mysteries of longevity and human evolution. Jing Shitou's " A Golden Doll Dig From the Ground " was a novel about the real world. Li Zhenxing's soul traveled through time and a similar ring triggered a series of unexpected events, involving the rebirth of contemporary farmers, farming, and rural life. The dusty " Climbing to the Peak " was a fantasy novel from a different continent. The small character Fang Yan was reborn with inexplicable memories. He had a strange jade pendant, experienced strange things, and reached the peak. There were also magic and battle energy elements. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Spiral drainage pipe
Spiral drainage pipe was a kind of pipe used in building drainage system, which had some characteristics and advantages. Spiral drainage pipe has the following characteristics: 1. Reduce noise: The design of the spiral drainage pipe can effectively reduce the noise pollution caused by drainage. The measured results showed that compared with the traditional cast iron drainage pipe, the noise of the spiral drainage pipe was about 2 to 4 decibels lower, and it had a silencing effect. 2. To prevent the damage of the floor drain seal: The spiral structure inside the spiral drainage pipe can reduce the pressure fluctuation in the pipe, avoid the damage of the water seal caused by the negative pressure of the upper user and the positive pressure of the bottom user, and improve the stability of the drainage system. 3. Increase drainage efficiency: The internal spiral structure of the spiral drainage pipe increases the friction resistance of the water flow, preventing the water flow from blocking the pipe due to inertia, improving drainage efficiency and reducing the occurrence of blockage accidents. 4. [Double silencing effect: Hollow wall spiral drainage pipe is a special structure of spiral drainage pipe. It has a double-layer structure and honeycomb-shaped holes, which can further isolate noise and have a better silencing effect.] In general, the spiral drainage pipe had the advantages of reducing noise, preventing the damage of the floor drain seal, and improving drainage efficiency. They are commonly used in the drainage system of buildings, especially for the drainage of single standpipes in high-rise buildings.
same floor drainage
Same-floor drainage was a drainage method for sanitary appliances. Its characteristic was that the drainage pipe did not need to pass through the floor, but was laid in the same floor and connected to the drainage standpipe. There were two main forms of same-floor drainage: wall-row zero-drop same-floor drainage and slightly-drop same-floor drainage. The wall row zero-drop drainage on the same floor meant that the drainage pipe went along the wall and did not occupy the vertical floor height. The bathroom could maintain the same floor height as other rooms, and the design freedom was higher, and it was beautiful and practical. The same floor drainage with micro-descending plates was a common form in China. It required the installation of dry area floor drain, which could almost achieve zero floor height difference without occupying vertical floor height. The difference between the same floor drainage and the different floor drainage was the layout of the bathroom appliances, the aesthetics of the house, and the drainage noise. The advantages of same-floor drainage were high degree of freedom in layout, beautiful houses, and low drainage noise, but there were also shortcomings such as high construction cost and difficult maintenance. In general, same-floor drainage was a healthier, more convenient, and more beautiful drainage method.