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Online since: October 2013
Authors: Xing Qian Peng, Li Qun Guo, An Lu Li
Tab.1 The average rebound value and strength of the rammed-earth blocks Moisture content[%] Number Average rebound value Rm [mm] Compressive strength fcu[MPa] 110 -Year 240-Year 110 -Year 240-Year 2.0 1 44 50 1.52 1.36 2 42 47 1.48 1.32 3 40 45 1.49 1.30 2.5 4 40 46 1.47 1.31 5 37 47 1.38 1.25 6 37 43 1.40 1.22 3.0 7 38 43 1.35 1.25 8 34 43 1.32 1.30 9 35 39 1.36 1.17 3.5 10 32 40 1.29 1.21 11 33 40 1.24 1.23 12 33 41 1.30 1.10 4.0 13 32 39 1.19 1.15 14 30 36 1.15 1.05 15 29 34 1.21 1.11 5.0 16 27 34 1.08 0.96 17 29 35 1.18 1.02 18 25 32 1.10 0.91 Building testing strength curve of rammed-earth material .The equation of the < Technical Specification > to establish the testing strength curve of rammed-earth material: (3) According to the literature [13] and [14] to select a more suitable equation, add two equations:
[MPa];δis the average relative error of compression strength [%],accurate to 0.1;er is the relative standard deviationof compression strength[ %],accurate to 0.1;n is the number of specimens.
Grain Distribution Technology, 7(16)(2004)40-42.
Online since: January 2015
Authors: Shao Wei Pan, Miao Miao Zhang, Rui Xiang Liu
The pore here means the relatively broad part in the pore network system which is surrounded by rock grains and can contain fluid, and the throat means the relatively narrow part that connects the pores, which plays an important role in forming a channel.
Connect all these images according to random coordination number, we will then get a two dimensional random fractal network model of the pores.
Through the number of events that distributed exactly same with data of the estimated points in training image, a probability distribution could be concluded.
Online since: December 2014
Authors: Fang Yuan Yuan
Carburizing agent in superior efficiency, does not produce the decarburization layer on the surface of the carburizing, no grain boundary oxidation, surface clean and bright, small distortion.
Wear resistance and corrosion resistance have improved significantly. 4.In the field of medical polymer 1)Enhance the antimicrobial properties With the rapid development of biological medicine, every year there are a large number of implanted artificial organs or parts, but there are more than half of the implant infection.
Experimental results show that all kinds of nitrogen plasma (gaseous amide, amino compounds and ammonia) after processing, can be introduced in the material surface amino, promote the cell adhesion and growth, at the same time, the number and density of material surface amino is important for cell adhesion.
Online since: December 2014
Authors: Hao Dong Wang, Yan Hong Gu, Qing Xi Lu, Xiao Huang
Fig. 1 The chemical composition of soil in different places in Yanqing new town area Table 1 Chemical composition and classification of saline soil in the main sampling points in the new town area Serial number Sampling depth 0-0.05 m Serial number Sampling depth 0.5~0.55 m Cl- mg/kg SO42- mg/kg Saline soil type Cl- mg/kg SO42- mg/kg Saline soil type Y1 18.2 41.9 1.17 Sulfurous acid type Y1 146.8 623.0 0.118 Sulfuric acid type Y2 1286.7 5246.9 0.66 Y2 19.9 80.8 0.123 Y3 1888.4 2580.7 1.98 Y3 21.3 106.8 0.100 Y4 283.4 1745.9 0.44 Y4 39.0 147.9 0.132 Y5 18.3 168.5 0.29 Sulfuric acid type Y5 36.1 84.3 0.214 Y6 274.9 681.8 1.09 Sulfurous acid type Y6 20.3 76.9 0.132 Y7 183.8 1699.8 0.29 Sulfuric acid type Y7 48.5 249.6 0.097 Y8 410.8 1987.7 0.56 Sulfurous acid type Y8 29.6 106.8 0.138 Y9 145.7 1501.0 0.26 Sulfuric acid type Y9 21.0 68.2 0.154 Fig. 2 The salinity of saline soil change with depth Fig. 3 Partition map of saline soil type In the new town area, the
In the engineering construction, due to the shallow depth of saline soil, the saline soil can be directly excavated and replaced by easy compacted coarse-grained soil (such as sand), which can cut off the rise of harmful capillary water; more than 30 cm thick of compacted orthod should be laid on the top to isolate the infiltration of surface water, which can remove the salt expansion and corrosion harm of saline soil.
Online since: July 2016
Authors: Chun Lei Wan, Kaleem Ahmad, Hany S. Abdo, Mohammad A. Al-Eshaikh, Ahmed N. Kadachi, Rawaiz Khan
All the peaks are generally indexed to the standard BiSbTe PDF card number 49-1713.
The fractured surfaces of 0.5 vol. % BiSbTe/MWCNTs composite show in Fig. 5 the flake like lamellar grains of BiSbTe [9].
Acknowledgement This Project was funded by the National Plan for Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia, Award Number (11-NAN1913-02).
Online since: January 2012
Authors: Jing Jing Li, Guang Ying Gao, Yu Fei Wang, Lin Guo
The initiator (0.2 ~ 0.8% of the total monomer) was relatively appropriate, because it could make the product be prepared blue present, small grain size and good emulsion stability.
If the monomer dropping speed too fast, the monomer increased in short time can make reaction system temperature rise, reduce the activation energy of initiator, produce more number of free radicals, reaction intensify reaction, result in “explosive polymerization”.
Unstable dropping speed of initiator can lead to different free radicals number generated in different polymerization stages, and not consistent polymerization rate, resulting to the difficult of controlling reaction temperature.
Online since: June 2018
Authors: Karel Dvořák, Marcela Fridrichová, Dominik Gazdič, Jana Mokrá
The resulting destruction are visible after a few months to years. [3] Thermodynamic stability of ettringite was dealt by a number of authors [3, 5, 6, 7, 8, 9, 10, 11] Equation of decomposition of ettringite can be written as follows: Ca6[Al(OH)6]2(SO4)3·26H2O → Ca4[Al(OH)6]2SO4·8H2O + 2CaSO4·0,5H2O + 17H2O (1) As it has been known, ettringite is unstable at high temperatures, but also for other external parameters, such as relative air humidity and pH.
a) 8 days 22 days 99 days b) Fig. 3 SEM of ettringite exposed to the a) laboratory environment, b) environment of saturated water vapour at specific time periods of hydration In images of synthetically prepared samples of ettringite, drawn by scanning electron microscopy, prismatic grains of ettringite, which has a high nucleation and the crystallization rate, namely in high amounts, could be observed already after the first day of hydration.
Acknowledgment This work was financially supported by project number: 17-24954S “The Conditions of Thermodynamic Stability and Transformation of AFt Phases” and project No.
Online since: March 2015
Authors: Magdalena Popczyk, B. Łosiewicz
Therefore, the present study was undertaken in order to obtain electrochemically at different temperatures of electrodeposition (30-60oC) the nickel based composite coatings containing embedded molybdenum and molybdenum sulfide grains.
It means that the electrochemical activity of the electrodes numbered from 1 to 4 decreases with the lowering content of both MoS2 and Mo composite components in the deposited coatings.
It is clear that the Ni+MoS2+Mo composite coating deposited at the temperature of 30oC and numbered as electrode 1 (Tabs. 1 and 2), has the highest activity towards the HER (highest value of j0 and lowest values of DE10, DE100, Rct, log |Z|0.1) among all tested electrodes.
Online since: November 2013
Authors: Jhumki Hait, Ranajit Kumar Jana, K.K. Singh, T.R. Mankhand, Navneet Singh Randhawa, Prvan Kumar Katiyar
A number of methods are used to process WC scrap.
It was seen that a number of pits were formed on the surface of the sample.
Whitefield, Fine grained WC-VC-Co hard metal, Powder Metallurgy 39 (1996) 210-212
Online since: May 2012
Authors: Ulrich Starke, Thierry Ouisse, Didier Chaussende, Camilla Coletti, Alexei A. Zakharov, Konstantin Emtsev
In contrast, on cubic SiC substrates, namely the corresponding Si-face, i.e. 3C-SiC(111), just a few studies of graphene growth have been performed, yielding grain sizes of only a few micrometers and with limited homogeneity of the layers obtained [3-5].
Electron reflectivity spectra extracted from energy series of such LEEM images can be used to count the number of graphene layers present [12] by counting the number of minima in the energy range between 0 and 6 eV.
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