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Online since: July 2014
Authors: Hai Dong Wang, Guang Le Chang, Ji Ping Deng, Jing Jie Zheng, Yi Lin Zhao
In addition, since the one-time and long-term characteristics of highway and water engineering, and the project cannot be reworked and reconstructed, total quality management theory by its own cannot improve large-scale projects.
Then, if faced with some technically sophisticated, difficulty and high-quality demanding programs in the project or those with new processes, technology, structure and material ones, analyze and point out those problems depending on large amounts of data and professional knowledge.
Geotextile and drain board installation Avoid waterproof layer leakage and water seepage.
Accurate position of Water Stop; other items and procedures meet the requirements of concrete engineering in bridging.
The weight coefficients for different objects are set according to the degree of concern, interests and professional competence, etc. for each object and link.
Then, if faced with some technically sophisticated, difficulty and high-quality demanding programs in the project or those with new processes, technology, structure and material ones, analyze and point out those problems depending on large amounts of data and professional knowledge.
Geotextile and drain board installation Avoid waterproof layer leakage and water seepage.
Accurate position of Water Stop; other items and procedures meet the requirements of concrete engineering in bridging.
The weight coefficients for different objects are set according to the degree of concern, interests and professional competence, etc. for each object and link.
Online since: February 2012
Authors: Zhuo Li, Dan Hua Chen
The model
And the circulatory system of the cold side includes the heat absorption water tank which exposures to modules, circulating pump, water pump transformer, radiators and storage tanks.
The temperature of the water in the tank bottom should be uniform and not too high, otherwise the water in the tank bottom may boiled because of overheat.
The water temperature of model 2 is relatively distributed evenly.
This gives us the design direction of circulatory system the cold side; we can add ribs in the tank cavity, to increase the heat transfer area between the water tank internal walls and the water.
Based on the same tank, the higher Inlet velocity of water, the more heat of water tank will be carried away, and the more heat of cold side will be absorbed.
The temperature of the water in the tank bottom should be uniform and not too high, otherwise the water in the tank bottom may boiled because of overheat.
The water temperature of model 2 is relatively distributed evenly.
This gives us the design direction of circulatory system the cold side; we can add ribs in the tank cavity, to increase the heat transfer area between the water tank internal walls and the water.
Based on the same tank, the higher Inlet velocity of water, the more heat of water tank will be carried away, and the more heat of cold side will be absorbed.
Online since: March 2013
Authors: Rui Li, Si Qi Li
Air conditioning water system
The air-conditioning water system is a large heat exchange with water as a medium to transfer cold or heat between buildings.
Some designers do not make each water loop for water balance calculation, and also failed to take effective measures to press differences between each loop.
Air conditioning water system When the cooling water cross through the cooling tower, firstly use the temperature difference between nature and the cooling water, if this is not enough send a request to re-start the fan cooling, in order to achieve the requirements of the cooling water temperature of the chiller.
The cooling water of the cooling tower is not a separate part, which will run from the cooling towers to the chillers, cooling towers and chillers make a loop, then the contaminated water in the cooling tower fouling in the cooling water system, that make corrosion and moss so that the cooling water flow is reduced resulting in a rise in unit energy consumption.
The operation and management aspects of the majority needed regulation, which requires managers to have a higher level of professional and business skills, therefore it is necessary to the equipment managers and maintenance personnel system of energy-saving operation and management training.
Some designers do not make each water loop for water balance calculation, and also failed to take effective measures to press differences between each loop.
Air conditioning water system When the cooling water cross through the cooling tower, firstly use the temperature difference between nature and the cooling water, if this is not enough send a request to re-start the fan cooling, in order to achieve the requirements of the cooling water temperature of the chiller.
The cooling water of the cooling tower is not a separate part, which will run from the cooling towers to the chillers, cooling towers and chillers make a loop, then the contaminated water in the cooling tower fouling in the cooling water system, that make corrosion and moss so that the cooling water flow is reduced resulting in a rise in unit energy consumption.
The operation and management aspects of the majority needed regulation, which requires managers to have a higher level of professional and business skills, therefore it is necessary to the equipment managers and maintenance personnel system of energy-saving operation and management training.
Online since: October 2012
Authors: You Qiao Zhang, Hai Yan Hu
An automatic greenhouse seedling monitoring system that can make use of solar energy as power supply to conduct regular monitoring and collect air temperature, air humidity, soil temperature, soil water demand and other parameters is designed.
The automatic monitoring and processing system for seedling we designed is able to continuously monitor and acquire interior air temperature, air humidity, soil temperature, soil water demand and other parameters and then transmit the data to PC system of host in control room wirelessly.
The main measured parameters include air temperature, soil temperature, air humidity, soil water content and other parameters.
Considering conventional method of measurement is poor at accuracy, hydraulic conductivity is used in this system to determine soil hydraulic demand as the larger the soil hydraulic demand, the lower the water content; there are many ways available to determine hydraulic conductivity.
Sub-control system is composed by embedded industrial computers and curing professional software.
The automatic monitoring and processing system for seedling we designed is able to continuously monitor and acquire interior air temperature, air humidity, soil temperature, soil water demand and other parameters and then transmit the data to PC system of host in control room wirelessly.
The main measured parameters include air temperature, soil temperature, air humidity, soil water content and other parameters.
Considering conventional method of measurement is poor at accuracy, hydraulic conductivity is used in this system to determine soil hydraulic demand as the larger the soil hydraulic demand, the lower the water content; there are many ways available to determine hydraulic conductivity.
Sub-control system is composed by embedded industrial computers and curing professional software.
Online since: September 2013
Authors: Ling Li, Yong Gang Qu, Xue Wen Wu
This is a new attempt, which maybe provides a theoretical basis or inspiration to professional technology research.
Engineering nodes include hydropower stations, reservoirs, and sluices, pumping stations, water transfer projects, comprehensive engineering and other water conservancy project facilities as shown in Fig. 1.
Nowadays, many large-scale water conservancy constructions, including reservoirs, hydropower station and water conservancy, have been built in Haihe River Basin.
These nodes reallocate of water resources.
For example, Huangbizhuang Reservoir is a large-scale water conservancy project, which mainly controls the floods and takes into account the comprehensive utilization of water usage, irrigation and power generation.
Engineering nodes include hydropower stations, reservoirs, and sluices, pumping stations, water transfer projects, comprehensive engineering and other water conservancy project facilities as shown in Fig. 1.
Nowadays, many large-scale water conservancy constructions, including reservoirs, hydropower station and water conservancy, have been built in Haihe River Basin.
These nodes reallocate of water resources.
For example, Huangbizhuang Reservoir is a large-scale water conservancy project, which mainly controls the floods and takes into account the comprehensive utilization of water usage, irrigation and power generation.
Online since: August 2014
Authors: Zhi Yuan Yin, Wang Lin Li, Xu Huang, Na Li
Throughout the domestic and foreign research, we found that: Most of the research focus on the establishment of the model and analysis mostly involve the professional knowledge, relatively few in the study of traffic problems caused by the heavy rain.
Because the concentration of water catchment area in low-lying area.
Jinan is not yet having a main force ditch to drain away water.
Advances in water science,1997, 8(2):109-112
Water supply and drainage in China, 2007,23(12):16-21.
Because the concentration of water catchment area in low-lying area.
Jinan is not yet having a main force ditch to drain away water.
Advances in water science,1997, 8(2):109-112
Water supply and drainage in China, 2007,23(12):16-21.
Online since: October 2011
Authors: Bin Qi Ma, De Wei Wang
Then at the roof of the camber-shaped region formed by PVC sheet, a water inlet is cut, which allows cold water to pour in.
If the water inside the PVC sheet should be released, just open the two switches at the water inlet.
By the gravitational potential energy of water, water on the ground level is lead to water storage box, is shown in Fig. 6.
In summer day, cold water inside the PVC sheet turns to warm water after the daylight shines on it.
So the warm water can serve as bath water after being stored in the water storage box.
If the water inside the PVC sheet should be released, just open the two switches at the water inlet.
By the gravitational potential energy of water, water on the ground level is lead to water storage box, is shown in Fig. 6.
In summer day, cold water inside the PVC sheet turns to warm water after the daylight shines on it.
So the warm water can serve as bath water after being stored in the water storage box.
Online since: February 2013
Authors: Xue Feng Zheng, Yao Feng Liu, Zhi Liang Wang, Hao Ru Su
However only less than 1% disaster sites are automatically monitored by professional equipment.
The main equipment which measuring underground water pressure is gap type pressure gauge, include resistance type and steel string type, the soil pressure and water pressure effect on the contact surface, through the permeable rock ,only the pore water pressure can be transferred to the elastic element, The elastic deformation lead to the change of steel wire tension ,so we can measure the pore water pressure according to the change of steel string frequency.
The rain collected by the cylinder mouth flowing into a measuring tube, then the buoy inside the tube will raising with the water,when the tube is filled with 10 ~ 20 mm rainfall, it will have a short time siphon action,the water inside will be drained clear.
Tipping bucket rain gauge:it have two triangular tipping buckets,only one of the two triangular tipping buckets face to the water leakage mouth each time,when the tipping bucket filled with about 0.1mm or 0.2 mm rainfall,it dump the water out by moving out the center,then the water pour out,at the same the other tipping bucket face to the water leakage mouth,the alternating frequency and time interval of the tipping buckets can be recorded at the same time.
As shown in Fig. 5 pore water pressure monitoring from the graph analysis, pore water pressure will have a great improve around April 26th and may 10th .
The main equipment which measuring underground water pressure is gap type pressure gauge, include resistance type and steel string type, the soil pressure and water pressure effect on the contact surface, through the permeable rock ,only the pore water pressure can be transferred to the elastic element, The elastic deformation lead to the change of steel wire tension ,so we can measure the pore water pressure according to the change of steel string frequency.
The rain collected by the cylinder mouth flowing into a measuring tube, then the buoy inside the tube will raising with the water,when the tube is filled with 10 ~ 20 mm rainfall, it will have a short time siphon action,the water inside will be drained clear.
Tipping bucket rain gauge:it have two triangular tipping buckets,only one of the two triangular tipping buckets face to the water leakage mouth each time,when the tipping bucket filled with about 0.1mm or 0.2 mm rainfall,it dump the water out by moving out the center,then the water pour out,at the same the other tipping bucket face to the water leakage mouth,the alternating frequency and time interval of the tipping buckets can be recorded at the same time.
As shown in Fig. 5 pore water pressure monitoring from the graph analysis, pore water pressure will have a great improve around April 26th and may 10th .
Online since: March 2015
Authors: Jun Wei Li, Jing Li, Zhi Nan Jiang
Whereas the accomplished roadbed exposed to atmospheric environment, the soil mass will undergo periodical freezing and thawing action caused by the change of climate, atmospheric precipitation, surface water and underground water, then the strength of roadbed should be changed subsequently.
One is the freezing temperature of water through the soil; another is the performance of the selected test instrument.
The test specimen was prepared according to the optimal water content, and then compacted to determine the initial parameters including the height, weight and water content.
The p-l curves of soil with cycle numbers can be obtained after bearing plate test in the optimum water content, shown in the Fig3.
The void in soil increased due to the 9% addition in the volume when water changed to ice.
One is the freezing temperature of water through the soil; another is the performance of the selected test instrument.
The test specimen was prepared according to the optimal water content, and then compacted to determine the initial parameters including the height, weight and water content.
The p-l curves of soil with cycle numbers can be obtained after bearing plate test in the optimum water content, shown in the Fig3.
The void in soil increased due to the 9% addition in the volume when water changed to ice.
Online since: March 2024
Authors: Nur Hidayah Ahmad Nizar, Ling Xin Khong, Noor Aida Saad, Muhammad Azfar Kamaruddin, Hareyani Zabidi, Suhaina Ismail
In this study, US EPA National Primary Drinking Water Regulation and MOH Drinking Water Quality Standard will be used to do a preliminary evaluation of the water quality to be used as drinking water.
In-situ measurements were conducted for physicochemical parameters which included temperature, electrical conductivity (EC), total dissolved solid (TDS), salinity, dissolved oxygen (DO), pH, and water level using a YSI Professional Plus handheld multiparameter.
The turbidity of water sample water samples varies in different locations and time.
The average TDS of 188mg/l is a hint that the water samples are mostly fresh water as the measurement of water with lower than 1000mg/l is considered acceptable according to MOH raw water quality stnadard.
Agency (2020). https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations.
In-situ measurements were conducted for physicochemical parameters which included temperature, electrical conductivity (EC), total dissolved solid (TDS), salinity, dissolved oxygen (DO), pH, and water level using a YSI Professional Plus handheld multiparameter.
The turbidity of water sample water samples varies in different locations and time.
The average TDS of 188mg/l is a hint that the water samples are mostly fresh water as the measurement of water with lower than 1000mg/l is considered acceptable according to MOH raw water quality stnadard.
Agency (2020). https://www.epa.gov/ground-water-and-drinking-water/national-primary-drinking-water-regulations.