Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: May 2014
Authors: Chang Wei He, Meng Zhang, Xiao Ping Jia, Yuan Liu
On the feed water pipe of the evaporators of all cold store rooms, there are solenoid valves, which are controlled by relays.
According to the new cold store’s size and reference some professional standards, the total heat load is worked out.
Choosing Condenser On board, water is plentiful and the cold stores are usually equipped with horizontal shell and tube condensers.
When choosing a condenser, the calculation mainly includes the heat exchange area, cooling water flux and the water resistance losing in the condenser.
According to the new cold store’s size and reference some professional standards, the total heat load is worked out.
Choosing Condenser On board, water is plentiful and the cold stores are usually equipped with horizontal shell and tube condensers.
When choosing a condenser, the calculation mainly includes the heat exchange area, cooling water flux and the water resistance losing in the condenser.
Online since: January 2022
Authors: Sana Khaled, Marjorie Bart, Sylvie Prétot, Florence Collet
The relationship between mud density and water to fine mass ratio is established from fine and water densities as follows:
ρmud=1 + Rw/F1ρF + Rw/Fρw (1)
Where ρmud is the mud density (kg/m3), Rw/F is the water to fine mass ratio (-), ρF is the absolute density of fines (2840 kg/m3) and ρw is the water density (1000 kg/m3).
Mud is left to settle and then excess water is removed (Fig 2).
If too much water is removed, water can be added during the composite production.
Compared to bibliography, the compressive strength of all the produced composites meets the requirements of the French professional rules, making them suitable for use as wall building material (minimal value = 0.2 MPa)(Construire en Chanvre, 2010).
This corresponds to a mass water content about 6%.
Mud is left to settle and then excess water is removed (Fig 2).
If too much water is removed, water can be added during the composite production.
Compared to bibliography, the compressive strength of all the produced composites meets the requirements of the French professional rules, making them suitable for use as wall building material (minimal value = 0.2 MPa)(Construire en Chanvre, 2010).
This corresponds to a mass water content about 6%.
Online since: October 2011
Authors: Wei Dong Pan, Ren Guo Gu, Gui Xian Hu, Xiao Long Sheng
Table.1 Summary table of Monitoring Items and Frequency
Number
Monitoring Item
Monitoring Frequency
From the beginning of foundation excavation to 3-day after the completion of concrete pouring of the structure foundation slab
Form 3-day-after completion of structure slab concrete pouring to beginning of underground structure construction, and to roof elevation
From building support removing to 3-day after Support removing complete
Common situation
1
Lateral deformation monitoring
1 time/day
1 time/day
2~3 times/week
2
Horizontal displacement monitoring
1 time/day
1 time/day
2~3 times/week
3
Settlement monitoring
1 time/day
1 time/day
2~3 times/week
4
Water level monitoring
1 time/day
1 time/day
2~3 times/week
5
Building Cracks monitoring
1 time/week
1 time/week
1 time/week
6
Stress of Building envelope structure monitoring
1 time/day
1 time/day
2~3 times/week
7
Earth pressure monitoring
1 time/2-day
1 time/2-day
2~3 times/week
8
Pore water pressure monitoring
1 time/2-day
1 time/2-day
A robust project monitoring organization must establish an administration panel which comprised by project leader, technical director and experienced professional monitoring staffs.
Beijing: China Water Power Press, 2008 [3] Wu Zhenjun, Wang Hao, Wang Shuilin, et al.
Study on Management and Quality Control of Water Automatic Monitoring Early-warning System in Taihu Basin [J].
A robust project monitoring organization must establish an administration panel which comprised by project leader, technical director and experienced professional monitoring staffs.
Beijing: China Water Power Press, 2008 [3] Wu Zhenjun, Wang Hao, Wang Shuilin, et al.
Study on Management and Quality Control of Water Automatic Monitoring Early-warning System in Taihu Basin [J].
Online since: February 2014
Authors: Pavlo V. Kryvenko, Yue Guo, Lu Qian Weng, Hai Lin Cao, V.I. Pushkar, O.N. Petropavlovsky, A.Yu. Kovalchuk
Table 1 Chemical composition
Basic oxides
Quantity of oxide, %
Slag
Fly ash
Portland cement
SiO2
39.4
51.61
25.4
SO3
1.4
0.17
2.37
MgO
5.19
0.82
2.51
Al2O3
6.8
32.31
5.28
MnO
0.32
-
0.17
CaO
47.38
5.19
60.31
Fe2O3
-
6.63
2.9
FeO
0.32
-
K2O
0.52
1.36
0.49
Na2O
0.6
0.28
TiO2
0.26
-
0.28
Table 2 Concrete mix compositions
No 1
No 2
No 3
Slag
352
317
352
ОРС
8
8
8
Fly ash
-
70
-
Sand
670
670
670
Crushed stone
1150
1115
1150
Water
148.3
152
160
Na2CO3
16
16
8
Na2SiO35Н2О
24
24
32
Density, kg/m3
2390
2400
2400
A cast-in-situ concrete wall (width= 3 m, height= 7 m and length over 100 m) was taken as an object for modeling.
A numerical modeling of a thermostressed state was performed using the professional software product “Elcut” [3].
Crack tip critical –stress- intensity factor vs. crack depth (mm) Despite the fact that alkali activated cement concretes are characteristic of shrinkage deformations at levels of Portland cement concretes [5], however, their lower temperature in the conditions of hot climate causes the less diffusion of water vapors into the ambient environment and, hence, acceleration of shrinkage processes in the concrete.
So, in case of the alkali activated slag cement concretes when a difference between the temperature of the concrete and of the ambient environment of 20оС, the rate of water diffusion into the ambient environment, in accordance with the Fick’s Law can show a 12- fold increase.
At the same time, in case of Portland cement concrete, when a difference between the concrete temperature and the temperature of ambient environment is 40оС, the rate of water diffusion can show more than 38- fold increase.
A numerical modeling of a thermostressed state was performed using the professional software product “Elcut” [3].
Crack tip critical –stress- intensity factor vs. crack depth (mm) Despite the fact that alkali activated cement concretes are characteristic of shrinkage deformations at levels of Portland cement concretes [5], however, their lower temperature in the conditions of hot climate causes the less diffusion of water vapors into the ambient environment and, hence, acceleration of shrinkage processes in the concrete.
So, in case of the alkali activated slag cement concretes when a difference between the temperature of the concrete and of the ambient environment of 20оС, the rate of water diffusion into the ambient environment, in accordance with the Fick’s Law can show a 12- fold increase.
At the same time, in case of Portland cement concrete, when a difference between the concrete temperature and the temperature of ambient environment is 40оС, the rate of water diffusion can show more than 38- fold increase.
Online since: August 2014
Authors: Xue Ying, Bing Bing Wu, Hui Tang, Si Tao Yang, Jian Chen Wang
Gossypol (GP) is a kind of poorly water-soluble polyphenolic compounds.
To reverse this situation, being prepared gossypol nanosuspensions (GP-NS) can improve the water solubility and stability of gossypol.
Water was allowed ad libitum.
All pharmacokinetic parameters were calculated by DAS software (Ver. 2.0, Mathematical Pharmacology Professional Committee of China).
The determination of water absorption and secretion, is important for the calculation of drug permeability.
To reverse this situation, being prepared gossypol nanosuspensions (GP-NS) can improve the water solubility and stability of gossypol.
Water was allowed ad libitum.
All pharmacokinetic parameters were calculated by DAS software (Ver. 2.0, Mathematical Pharmacology Professional Committee of China).
The determination of water absorption and secretion, is important for the calculation of drug permeability.
Online since: August 2018
Authors: Giselle Lou D. Leuterio, Bryan B. Pajarito, Andrew Joelle F. Caguntas, Niño B. Felices, Honesto Ovid S. Tubalinal
Meanwhile, only epoxysilane-treated nepheline syenite significantly increased the water contact angle of saturated PE.
The mixtures were degassed by sonication in cold water bath for 30 min before used as coating.
Static water contact angles of coatings were measured according to ASTM D7334.
(c) Average water contact angles of composite PE coatings.
Papavinasam: Corrosion Control in the Oil and Gas Industry (Gulf Professional Publishing, London 2014)
The mixtures were degassed by sonication in cold water bath for 30 min before used as coating.
Static water contact angles of coatings were measured according to ASTM D7334.
(c) Average water contact angles of composite PE coatings.
Papavinasam: Corrosion Control in the Oil and Gas Industry (Gulf Professional Publishing, London 2014)
Online since: May 2011
Authors: Bao Long Zhu, Xi Yong Wu
This results in an increase in pore-water pressure and a corresponding decrease in shearing resistance.
Based on geophysical reconnaissance, muddy water coming from 1# landslide was found.
This phenomenon shows that there was no relationship with surface water erosion,but with the underground water erosion from the inner part of the landslide.
Abundance of underground water and surface water accelerates the tendency of the bedrock terraces to become weaker, which probably induced landsliding.
The variation in natural water content is an indication of the variability of engineering behavior of colluvial and eluvial soils.
Based on geophysical reconnaissance, muddy water coming from 1# landslide was found.
This phenomenon shows that there was no relationship with surface water erosion,but with the underground water erosion from the inner part of the landslide.
Abundance of underground water and surface water accelerates the tendency of the bedrock terraces to become weaker, which probably induced landsliding.
The variation in natural water content is an indication of the variability of engineering behavior of colluvial and eluvial soils.
Online since: June 2014
Authors: Claudinei Rezende Calado, F.A.R. Calado, G. Caput, S.C. Gomes, R.M. Andrade
The image processing algorithms were developed using the Matlab 2010a platform and tested on a PC-type computer with a 2.2 GHz processor, 1 GB of RAM and Windows XP Professional OS; the tests were performed in triplicate.
Table 1: Linear retraction, apparent density, apparent porosity and water absorption data.
Sample Linear retraction (%) Apparent density (g cm-3) Apparent porosity (%) Water absorption (%) Diameter ± Des.
For the 4th sample, the apparent density decreased as the apparent porosity and water absorption increased.
The remaining samples had water absorption values above 3.0%.
Table 1: Linear retraction, apparent density, apparent porosity and water absorption data.
Sample Linear retraction (%) Apparent density (g cm-3) Apparent porosity (%) Water absorption (%) Diameter ± Des.
For the 4th sample, the apparent density decreased as the apparent porosity and water absorption increased.
The remaining samples had water absorption values above 3.0%.
Online since: May 2024
Authors: Laouni Gaidi, Hadj Miloud Meddah, El Bahri Ould Chikh, Boudjellel Moulai Ali, Djilali Bouha, Abdellah Kaou, Athmane Khalifa Bouha
Various polyethylene (PE) pipes are widely used in Algeria to distribute potable water and natural gas in urban areas and water agricultural crops in the countryside.
Currently in Algeria, various polyethylene pipes are joined using traditional methods such as butt welding and electro-fusion welding, along with small and medium-diameter pipe connections used in agriculture and water distribution.
This research aims to maintain an acceptable elongation (relative elongation at break) compared to the base material and to study the effects of quenching by water on structural development and relaxation in the weld-affected zone.
This research will help industry professionals develop pipe collection devices and produce high-quality HDPE welds that reduce the cost of welding operations and shift toward more sustainable manufacturing processes.
Currently in Algeria, various polyethylene pipes are joined using traditional methods such as butt welding and electro-fusion welding, along with small and medium-diameter pipe connections used in agriculture and water distribution.
This research aims to maintain an acceptable elongation (relative elongation at break) compared to the base material and to study the effects of quenching by water on structural development and relaxation in the weld-affected zone.
This research will help industry professionals develop pipe collection devices and produce high-quality HDPE welds that reduce the cost of welding operations and shift toward more sustainable manufacturing processes.
Online since: September 2023
Authors: Shabnam Qureshi, Purvee Bhardwaj, Ghizal F. Ansari
Ansari2,c*
1Department of physics, Rabindranath Tagore University, Raisen, India,464993
2Department of physics, Madhyanchal Professional University, Bhopal, India,462044
aqshabnam256@gmail.com, bpurveebhardwaj@gmail.com, cansarigf@rediffmail.com*
*corresponding author
Keywords: Melting and quenching method, Oxygen packing density (OPD); Photoluminescence.
Using distilled water as the dipping medium and the Archimedes principle, the density of the specimens was measured at ambient temperature.
Glass specimens were weighed in air (Wa) and water (Ww), with water weighing one gram per cubic centimeter.
Each glass sample's density was measured using the relation below: ρg = Wa/{Wa –Ww} (1) Where (Wa) and (Ww) stand for the weights of a specimen of glass in distilled water and air, correspondingly.
Using distilled water as the dipping medium and the Archimedes principle, the density of the specimens was measured at ambient temperature.
Glass specimens were weighed in air (Wa) and water (Ww), with water weighing one gram per cubic centimeter.
Each glass sample's density was measured using the relation below: ρg = Wa/{Wa –Ww} (1) Where (Wa) and (Ww) stand for the weights of a specimen of glass in distilled water and air, correspondingly.