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Online since: August 2013
Authors: Yan Chen, Bao Xian Liu, Zhi Le Shu, Jia Zhen Huang
Introduction
During the tunnel construction, the occurrence of tunnel geological disasters(such as rock burst , landslip,water gushing,goaf,fault fracture zone) etc. are complex and random .Under the influence of instrument accuracy and technological level, great majority of tunnel construction have the problem —design accuracy is not enough.
Fig.1.1 Water gushing 1 Fig.1.2 Water gushing 2 Fig. 1.3 Water inrush Fig. 1.4 Fracture zone collapse The research of our advanced prediction carried out in fifties of the last century and application to the tunnel construction in the early 1970s.
If the wave encounters different impedance medium such as fracture zone,silt weak zone,cave,water-rich etc.
After the screening of correspond data through the professional processing software , it will be able to interpret the scope, type, and orientation of the front of face geological body.
However, this method can only detect whether the Aquifer is existence, and for specific bodies of water can not be measured.
Fig.1.1 Water gushing 1 Fig.1.2 Water gushing 2 Fig. 1.3 Water inrush Fig. 1.4 Fracture zone collapse The research of our advanced prediction carried out in fifties of the last century and application to the tunnel construction in the early 1970s.
If the wave encounters different impedance medium such as fracture zone,silt weak zone,cave,water-rich etc.
After the screening of correspond data through the professional processing software , it will be able to interpret the scope, type, and orientation of the front of face geological body.
However, this method can only detect whether the Aquifer is existence, and for specific bodies of water can not be measured.
Online since: October 2020
Authors: Radka Pernicová, Monika Utěšená, Jan Sestak
A professional expert opinion is required in the case of a quarrel at law, as the decision depends on the assessment of the facts for which expertise is required.
In particular, the consistency of the fresh mixture which must not change during transport or during the placement of the mixture, and also the compaction where the concrete must not begin to segregate and to sediment, nor must water be separated from it.
For this reason, recycled concrete nor recycled water should not be used for mixtures with exposure requirements.
It is also not recommended for this purpose to use absorbent admixtures in concrete, the presence of which affects sedimentation and water separation.
The water coefficient should not exceed a value of w/c = 0.55 and its value must not fluctuate.
In particular, the consistency of the fresh mixture which must not change during transport or during the placement of the mixture, and also the compaction where the concrete must not begin to segregate and to sediment, nor must water be separated from it.
For this reason, recycled concrete nor recycled water should not be used for mixtures with exposure requirements.
It is also not recommended for this purpose to use absorbent admixtures in concrete, the presence of which affects sedimentation and water separation.
The water coefficient should not exceed a value of w/c = 0.55 and its value must not fluctuate.
Online since: September 2014
Authors: Jun Huang, Da Jing Fang, Ya Ping Wang
Introduction
This project is the water draining structure, and high chloride ion content in seawater, thereby, to destroy the passivation membrane on the surface of the steel bar in concrete, accelerated the corrosion of steel bar, fatal influence on the service life of the structures [1].
Reference electrode needed fresh water soak for a while before installation, make its full moisture.
Conclusion Saudi Arabia zawel port water intakes structure of cathode protection project is a complicated construction technology, technical difficulty is high, concrete protection engineering area is larger.
The success of the project implementation due to the detailed investigation on the state of the environment, all aspects of materials widely collected, with the design of the cathodic protection practice experience experts, rigorous professional cathodic protection in the process of the construction team, the project department construction full cooperation, consultation of workers on-site technical guidance carefully.
Water intakes cathodic protection project structure of Saudi Arabia zawel port is Saudi seawater concrete structure and a successful example of cathodic protection, there are a lot of valuable experience and technology worth communication and learning.
Reference electrode needed fresh water soak for a while before installation, make its full moisture.
Conclusion Saudi Arabia zawel port water intakes structure of cathode protection project is a complicated construction technology, technical difficulty is high, concrete protection engineering area is larger.
The success of the project implementation due to the detailed investigation on the state of the environment, all aspects of materials widely collected, with the design of the cathodic protection practice experience experts, rigorous professional cathodic protection in the process of the construction team, the project department construction full cooperation, consultation of workers on-site technical guidance carefully.
Water intakes cathodic protection project structure of Saudi Arabia zawel port is Saudi seawater concrete structure and a successful example of cathodic protection, there are a lot of valuable experience and technology worth communication and learning.
Online since: October 2012
Authors: Hui Liu, Zhen Xie
The tunnel area is located in the hillside slope location, drilling is not measured in the survey of surface water.
According to the survey analysis, the main types of surface water in the region of the bedrock fissure water.
Bedrock fissure water is mainly stored in the venue bedrock fissure and karst cave, mainly due to atmospheric precipitation recharge, small water quantity.
However, due to the local limestone karst development, filled resistance clay and the existence of local water gushing phenomenon.
(3) Feedback and processing: After obtaining monitoring data, soring out and analyzing the monitoring data by professional monitors.
According to the survey analysis, the main types of surface water in the region of the bedrock fissure water.
Bedrock fissure water is mainly stored in the venue bedrock fissure and karst cave, mainly due to atmospheric precipitation recharge, small water quantity.
However, due to the local limestone karst development, filled resistance clay and the existence of local water gushing phenomenon.
(3) Feedback and processing: After obtaining monitoring data, soring out and analyzing the monitoring data by professional monitors.
Online since: September 2014
Authors: Ai Feng Zhang, Tian Lei Zhang, Jiang Ming Ding, Jin Yang Liu
Hydrocomp computer aiding ship propulsion system design software is a professional software which is developed by Hydrocomp USA company, for solving the design of ship propulsion system.
Numerical Calculation and Results Propeller Open Water Characteristic Curve.
The open water performance curve is drawn as shown in figure 5.
We can also conclude that when the propeller is in design condition, corresponding open water efficiency is not the largest open water efficiency [5].
Reference [1] Shijun Wang: China Water Transport no.5 (2010), p. 43.
Numerical Calculation and Results Propeller Open Water Characteristic Curve.
The open water performance curve is drawn as shown in figure 5.
We can also conclude that when the propeller is in design condition, corresponding open water efficiency is not the largest open water efficiency [5].
Reference [1] Shijun Wang: China Water Transport no.5 (2010), p. 43.
Online since: September 2013
Authors: Long Xiang, Zhong Bo Yu, Peng Fei Zhou, Xue Gao Chen, Yong Shu Zhu, Xing Chen
This paper gives a review on the study of related factors of non-point source pollution (NPS) in water cycle.
In fact, the plain area has small hypsography, well-developed water system and weak rainfall erosion.
Research of Soil and Water Conservation, 2006(05): p. 93-95+98
Journal of Soil and Water Conservation, 2004(03): p. 130-132
Water Saving Irrigation, 2011(11): p. 46-49+52
In fact, the plain area has small hypsography, well-developed water system and weak rainfall erosion.
Research of Soil and Water Conservation, 2006(05): p. 93-95+98
Journal of Soil and Water Conservation, 2004(03): p. 130-132
Water Saving Irrigation, 2011(11): p. 46-49+52
Online since: August 2012
Authors: Xin Tong Lin, Ru Liang Pan, Xue Yi Zhou
Its process is that a professional group analyzes the hazard and operability problems leaded by the deviation from the designed process conditions through researching each unit (node analysis)[2].
The impact of the cooling water temperature.
The temperature of cylinder cooling water has a great influence on the wear and tear.
In general, when the cylinder cooling water temperature is too low, and cylinder wall temperature is below the dew point of H2SO4 , the low-temperature corrosion will be aggravated; when cylinder cooling water temperature is too high, the bad cooling effects will result in serious oxidation of emulsified oil, much carbon dirt, destructive film, and sticking abrasion.
Usually, the wear is small when the cooling water outlet temperature is controlled in the 85 ~ 95 ℃[7].
The impact of the cooling water temperature.
The temperature of cylinder cooling water has a great influence on the wear and tear.
In general, when the cylinder cooling water temperature is too low, and cylinder wall temperature is below the dew point of H2SO4 , the low-temperature corrosion will be aggravated; when cylinder cooling water temperature is too high, the bad cooling effects will result in serious oxidation of emulsified oil, much carbon dirt, destructive film, and sticking abrasion.
Usually, the wear is small when the cooling water outlet temperature is controlled in the 85 ~ 95 ℃[7].
Online since: March 2016
Authors: Jian Liu, Jie Liu, Xing Long Leng, Fu Rong Qu
According to professional market organizations forecast report [1], OLED display and lighting market in 2019 will exceed $50 billion.
And the device package, the device isolated from the atmosphere of water vapor and oxygen in order to improve the device stability and working life, is very important [3].
In general, the polymer film is flexible, but its water and oxygen permeability is higher; metal films is limited to its application in the package due to conductive, opacity and other factors; and the inorganic insulating films such as SiO2, SiN and Al2O3 had very lower water oxygen permeation [4-9].
A comprehensive understanding on the alternating structure interface, alternating layers number of the structure on water and oxygen barrier properties is realized.
And interfacial characteristics have an important effect on water and oxygen barrier properties.
And the device package, the device isolated from the atmosphere of water vapor and oxygen in order to improve the device stability and working life, is very important [3].
In general, the polymer film is flexible, but its water and oxygen permeability is higher; metal films is limited to its application in the package due to conductive, opacity and other factors; and the inorganic insulating films such as SiO2, SiN and Al2O3 had very lower water oxygen permeation [4-9].
A comprehensive understanding on the alternating structure interface, alternating layers number of the structure on water and oxygen barrier properties is realized.
And interfacial characteristics have an important effect on water and oxygen barrier properties.
Online since: July 2017
Authors: Kássia Graciele dos Santos, Eduardo Santos Almeida, Vinícius Salgado Cardoso, Letícia Vieira Castejon, José Roberto Delalibera Finzer
An initial moisture analysis was carried out to determine the total amount of water and solids present in the commercial UHT milk.
In this work, it was used about 0.5 g lecithinated milk powder in 100 ml distilled water.
The test was performed in quadruplicate, establishing a maximum of 15 minutes after the samples fell into the water.
It was used 1 g of milk powder for 10 mL of distilled water.
(Blackie Academic & Professional 24th ed.
In this work, it was used about 0.5 g lecithinated milk powder in 100 ml distilled water.
The test was performed in quadruplicate, establishing a maximum of 15 minutes after the samples fell into the water.
It was used 1 g of milk powder for 10 mL of distilled water.
(Blackie Academic & Professional 24th ed.
Online since: January 2014
Authors: Rui Jin Zhang, Jin Song Gui, Ming Wei Feng
Introduction
MIKE21 is a professional engineering software developed by Danish Hydraulic Institute (DHI Water & Environment).
Depth-induced breaking occurs when waves propagate into very shallow areas, and the wave height can no longer be supported by the water depth.
In shallow water at a local water depth, d, the maximum wave height can be calculated from =γd in which γ is the breaker parameter.
Fig.1 Topographic map Increase the deep water per every 500 meters from shoreline in the vertical direction.
The tolerance is 2 meters which means the depth of water at shoreline is 0 meter and the 5000 meters away is 20 meters.
Depth-induced breaking occurs when waves propagate into very shallow areas, and the wave height can no longer be supported by the water depth.
In shallow water at a local water depth, d, the maximum wave height can be calculated from =γd in which γ is the breaker parameter.
Fig.1 Topographic map Increase the deep water per every 500 meters from shoreline in the vertical direction.
The tolerance is 2 meters which means the depth of water at shoreline is 0 meter and the 5000 meters away is 20 meters.