scholarly journals An Experimental Study for the Improvement of the Stain Resistance for Exterior Wall Paints in a Western City in China

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 220
Author(s):  
Xiao Huang ◽  
Caixia Wang ◽  
Dengling Zhu
Keyword(s):  
Experimental Study ◽  
Rapid Development ◽  
Great Influence ◽  
Building Industry ◽  
Exterior Wall ◽  
Pigment Volume Concentration ◽  
Acrylic Paint ◽  
Stain Resistance ◽  
Western City ◽  
Dispersing Agents

In recent years, with the rapid development of the building industry in western cities during the period of “Western Development” in China, the paints industry has developed rapidly and become more mature. In addition, waterborne inorganic exterior wall paints have been a great choice in the building industry because of their reduced volatile organic compounds (VOCs) and less toxicity and odor. However, the problem of stain resistance for exterior wall paints in western cities has not been solved, which has become a major obstacle to the application and promotion of exterior wall paints in western cities in China. Therefore, effective measures should eventually be carried out for improving the stain resistance of exterior wall paints in western cities in China. In this paper, an experimental study on improving stain resistance for exterior wall paints in a typical western city in China, Chongqing, is reported. In the three defined designs, the effects of the paint structure type, the pigment volume concentration (PVC), thickeners, cosolvents and wetting and dispersing agents on the stain resistance of exterior wall paints in a typical western city in China, Chongqing, were examined. The experimental results suggest that the stain resistance of silicone–acrylic paint was the most suitable among the three kinds of tested paints (silicone–acrylic paint, styrene–acrylic paint and pure acrylic paint). In addition, the PVC had a great influence on the stain resistance of the exterior wall paints. The compactness, water absorption and stain resistance of the paint’s film were the most suitable when the PVCs of the paints reached 45%. Furthermore, the tested wetting and dispersing agents made the same contributions to the paints’ stain resistance, as their decline rates for reflectivity were similar. The reflectivity of the film significantly decreased when the ratio of associating thickener to non-associating thickener reached 4:1, and also significantly declined when the content of propylene glycol reached 5%.

scholarly journals Coal Anisotropic Sorption and Permeability: An Experimental Study

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 104 ◽  
Author(s):  
Yulong Chen ◽  
Xuelong Li ◽  
Bo Li
Keyword(s):  
Experimental Study ◽  
Gas Adsorption ◽  
Great Influence ◽  
Flow Characteristics ◽  
Volumetric Strain ◽  
Bedding Plane ◽  
Gas Production ◽  
Desorption Process ◽  
Bedding Angle ◽  
Adsorption Desorption

Knowledge of the bedding plane properties of coal seams is essential for the coalbed gas production because of their great influence on the inner flow characteristics and sorption features of gas and water. In this study, an experimental study on the anisotropic gas adsorption–desorption and permeability of coal is presented. The results show that during the adsorption–desorption process, an increase in the bedding plane angle of the specimen expands the length and area of the contact surface, thereby increasing the speed and quantity of adsorption and desorption. With an increase in the bedding angle, the number of pores and cracks was found to increase together with the volumetric strain. The evolution of permeability of coal heavily depended on stress–strain stages. The permeability decreased with the increase of stress at the initial compaction and elastic deformation stages, while it increased with the increase of stress at the stages of strain-hardening, softening and residual strength. Initial permeability increased with increasing bedding angle.

Natural Science and Technical Peace Research: Definition, History, and Current Work

2020 ◽  
Vol 38 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Christian Reuter ◽  
Jürgen Altmann ◽  
Malte Göttsche ◽  
Mirko Himmel
Keyword(s):  
Natural Science ◽  
Rapid Development ◽  
Great Influence ◽  
Peace Building ◽  
Biological Weapons ◽  
Cyber Warfare ◽  
Weapon Systems ◽  
Peace Research ◽  
Peace And Security ◽  
Chemical And Biological Weapons

Scientific discoveries and technological innovations have always exerted a great influence on peace and security. New civil and military technologies are revolutionizing warfare. Particularly striking areas are cyber warfare and the rapid development of uninhabited weapon systems. Issues of nuclear disarmament, missile defence or space armament as well as chemical and biological weapons remain urgent. The conference SCIENCE · PEACE · SECURITY ’19 aimed for an accurate understanding and fruitful discussions of today’s and tomorrow’s peace and security challenges. This includes natural science/technical as well as interdisciplinary contributions, focusing on problems of international security and peace-building as well as contributions dedicated to transparency, trust-building, arms control, disarmament, and conflict management. This special issue presents selected contributions based on discussions at the conference.

scholarly journals Experimental Study on upward Flame Spread of Exterior Wall Thermal Insulation Materials

2015 ◽  
Vol 66 ◽  
pp. 161-164 ◽  
Author(s):  
Yanan Hou ◽  
Xudong Cheng ◽  
Shenyou Liu ◽  
Changcheng Liu ◽  
Heping Zhang
Keyword(s):  
Experimental Study ◽  
Thermal Insulation ◽  
Flame Spread ◽  
Exterior Wall ◽  
Upward Flame Spread ◽  
Insulation Materials

The Effect of the Carbon Fiber on Concrete Compressive Strength

2018 ◽  
Vol 1145 ◽  
pp. 106-111
Author(s):  
De Jia Liu ◽  
Mei Jun Chen ◽  
Li Xue ◽  
Fan He ◽  
Jian Hu
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Construction Material ◽  
Rapid Development ◽  
Great Influence ◽  
Engineering Application ◽  
Fiber Reinforced Concrete ◽  
Engineering Practice ◽  
Curing Time ◽  
Compressive Strength Of Concrete

With the rapid development of construction, the high quality of the construction material is required. Mixing carbon fiber in concrete attracts more and more attention as it can reinforce concrete. However, the science research and engineering application of carbon fiber reinforced concrete is relatively few. In this paper, the effects of different mixing amount of carbon fiber and the sand ratio in concrete and the curing time of concrete and relationships between these factors were investigated. Proper carbon fiber and sand ratio can promote the compressive strength of concrete and it has a good resistance to cracking. The compressive strength of concrete with different mixing amounts of carbon fiber peaks when the sand ratio was 31% and the compressive strength was better when the carbon fiber mixing amount was 0.2% and 1% than any other ratios after 28 days. When the sand ratio was 31%, the compressive strength of carbon fiber mixing amount increased with the increase of curing time and it reached the top when the carbon fiber ratio was 0.8%. The mixing amount of carbon fiber also had a great influence on the early compressive strength to some extent. We anticipate that the research can offer certain reference for engineering practice.

Experimental Study on Delamination during Trimming of CFRP

2015 ◽  
Vol 1089 ◽  
pp. 331-336 ◽  
Author(s):  
Qing Liang Chen ◽  
Jing Wen Zhou ◽  
Xue Mei Chen ◽  
Yan Chen ◽  
Yu Can Fu
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Great Influence ◽  
Fiber Direction ◽  
Type I ◽  
Cfrp Laminates ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Inclined Angle

Carbon fiber reinforced plastics (CFRP) laminates with different top/bottom fiber direction angle (stacking sequences of each ply) are trimmed at various workpiece inclined angles. Four types of delamination are studied and discussed. The results indicate that fiber direction has great influence on the type of delamination and the workpiece inclined angle determines the proportion of each type of delamination expect a special cast that the delamination form turns into type I/II when the workpiece inclined angle is 58.6o. Stacking sequences of each ply have great influence on the numbers of damaged plies and the 0o fiber direction ply has the ability to prevent the development of damaged ply.

Experimental Study on a Piezoelectric Energy Generator Excited by Rotating Magnets under Different Holding Conditions

2014 ◽  
Vol 620 ◽  
pp. 160-165
Author(s):  
Xian Fang Jin ◽  
Shu Yun Wang ◽  
Jun Wu Kan ◽  
Fang Sheng Huang ◽  
Jie Yu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Monitoring System ◽  
Great Influence ◽  
Magnetic Coupling ◽  
Peak Voltage ◽  
Rotating Speed ◽  
Piezoelectric Energy ◽  
Speed Range ◽  
Coupling Force ◽  
Self Powered

To meet the demand of rotating mechanism for self-powered monitoring system, piezoelectric energy generator (PEG) excited by the magnetic coupling force between rotating magnet fixed on a rotator and one magnet fixed on piezo-beam under different holding condition was presented. The influence of holding conditions (both sides holding, free holding, right side holding and left side holding) and rotating speed on energy generation of the PEG was investigated experimentally. The research results show that the holding condition exerts great influence on the peak voltage and the relative optimal rotating speeds at speed range of 0 to 1200 r/min under one magnet fixed on the end of the piezo-beam and one rotating magnet. Taking a example, when the configuration mode of rotating magnet and the fixed magnet is attract, under free holding the achieved peek voltages from the PEG are 23.6/49.6/69.2V at 300/336/456 r/min respectively. When rotating magnet and the fixed magnet attracting, under left side holding the achieved peek voltages from the PEG are 32.4/33.6/29.2V and under both sides holding the achieved peek voltages from the PEG are 16.4/16.4/16.8V at 300/336/456 r/min respectively.

scholarly journals Experimental Study of Compressive Strength of Lightweight Concrete Using Wood Charcoal

2021 ◽  
Vol 328 ◽  
pp. 10006
Author(s):  
Daud Andang Pasalli ◽  
Dina Limbong Pamuttu ◽  
Rahmat Fajar Septiono ◽  
Chitra Utary ◽  
Hairulla Hairulla
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Rapid Development ◽  
Volume Ratio ◽  
Wood Charcoal ◽  
Compressive Strength Test ◽  
Compressive Strength Of Concrete ◽  
Concrete Materials

The use of lightweight concrete materials in Indonesia, especially in the Merauke Regency area can be an alternative amid the rapid development of the housing sector. In this experimental study, the author took the initiative to replace coarse aggregate with wood charcoal as light coarse aggregate. The purpose of this study was to determine the value of compressive strength and to determine whether the wood charcoal material met the standard of lightweight concrete coarse aggregate. Planning the proportion of lightweight concrete mixture in this study using a volume ratio between cement, sand and wood charcoal of 1: 2, 1: 2: 2.5 and 1: 2: 5 with variations of test days at 3, 7, 14, 21 and 28 day. From the results of the compressive strength test of lightweight concrete, the use of wood charcoal aggregate as coarse aggregate in concrete causes the value of the compressive strength of concrete to decrease.

An Experimental Study to Determine the Optimal Sizes for Ball-Valve Micropump Channel

2012 ◽  
Vol 163 ◽  
pp. 100-106 ◽  
Author(s):  
Ming Hsun Wu ◽  
Chien Mu Lai
Keyword(s):  
Experimental Study ◽  
Great Influence ◽  
Ball Valve ◽  
Back Pressure ◽  
Optimal Size ◽  
Piezoelectric Film ◽  
Inlet Channel ◽  
Outlet Channel ◽  
Optimal Angle

The geometrical configurations of ball-valve micropumps have great influence on its efficiency. In particular, the ball valve channels have great influence on the efficiency of ball-valve micropumps because the prevention of backflow directly affects the performance of ball-valve micropumps.This study used water to investigate the optimal size of channels for piezoelectric ball-valve micropumps. The results show that the optimal angle for micro ball valve seats is 30°. The piezoelectric film vibrates rapidly and the back pressure in the water outlet channel is higher than it in the water inlet channel . This phenomenon indicates that channels are optimal sizes for a distance of 0 mm in the water inlet channel and 0.3mm in the water outlet channel.

scholarly journals Experimental Study of Torque Using a Small Scoop on the Lunar Surface

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Long Xue ◽  
Baichao Chen ◽  
Zhenjia Zhao ◽  
Zhaolong Dang ◽  
Meng Zou
Keyword(s):  
Experimental Study ◽  
Bulk Density ◽  
Lunar Surface ◽  
Great Influence ◽  
Test Results ◽  
The Moon ◽  
Rotating Speed ◽  
Simple Apparatus ◽  
The Earth

Chinese missions to the moon are planned to sample the regolith and return it to the earth. Microscale excavators may be good candidates for these missions, as they would significantly reduce the launch mass. Thus, it is necessary to research the interaction between the scoop and the regolith being sampled. We present the development of a simple apparatus to measure excavation torque. All tests were conducted using TYII-2 regolith simulant with gravels. The test results show that, under loose regolith conditions, the penetrating angle and the bulk density had a great influence on the excavation torque, while the rotating speed had little effect. However, when the bulk density was compact, the rotating speed did influence the excavation torque. The excavation torque increased sharply when the scoop encountered the gravels; actually, some of the parameters will influence the value of the torque such as the diameter, quantity, and position and inbuilt depth of the gravels. When the excavation torque sharply increases, the operation should be immediately stopped and checked.

Safety Evacuation at Metro Transit Station in Shenyang under Fire

2013 ◽  
Vol 864-867 ◽  
pp. 849-852 ◽  
Author(s):  
Yan Ying Xu ◽  
Wan Wan Duan ◽  
Lu Chao Li
Keyword(s):  
Structural Characteristic ◽  
Public Safety ◽  
Rapid Development ◽  
Great Influence ◽  
Evacuation Time ◽  
Safety Issues ◽  
The Public ◽  
Fire Scenarios ◽  
Transit Station ◽  
Safety Evacuation

It's necessary to pay much attention to the public safety issues of subway because of the rapid development of urban subway. Safety evacuation under different fire scenarios were simulated by using SIMULEX 2.0 at Metro transit station (Youth Street station) in Shenyang combined the actual structural characteristic. The results show that the evacuation capacity of Metro Line 1 is smaller than Metro Line 2; the staircase to the station hall of Metro Line 1 would be the bottleneck of the entire evacuation process; different paths have a great influence on the evacuation time; the staircase width from the platform to the station hall is the bottleneck in the evacuation procedure.

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