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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: 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: October 2006
Authors: Moo Young Huh, Hyung Gu Kang, C.K. Kang
In order to observe the orientation distribution of grains throughout the whole sample thickness, the longitudinal sections of the asymmetrically rolled samples were prepared by careful grinding and polishing.
This FEM result indicates that asymmetrical rolling with a large number of rolling passes promotes the shear deformation, which reflects the evolution of strong shear textures in the sample rolled by four passes as shown in Fig. 2.
The FEM calculations indicate that asymmetrical rolling with a large number of rolling passes promotes the shear deformation, which results in the formation of shear textures.
Online since: March 2010
Authors: Ying Xu, Yu Bo Dou
The whole process is confirmed by the ways of observation in front of furnace, while the mixed materials are completely fused, vitrification, and there is no scruff, unfused sand grain, bubble, then the crucible is took out by proper way and moulding model is poured.
Writer' phone number: 13503259969 fax number: 0315-2592354 e-mail address:yuyingdd@yahoo.com.cn References [1].
Online since: May 2004
Authors: Kiyoshi Okada, Yoshikazu Kameshima, Atsuo Yasumori, T. Toya
Glass-ceramics have a number of useful applications such as building materials, cooking ceramics, machinable ceramics, bio-ceramics, optical materials, etc.[2] Recently, the preparation of glass- ceramics from various wastes such as slags [3], coal ash [4], incinerator ash [5], waste glass and shell [6], phosphorous fertilizer and oil shale ash [7], etc has been investigated.
This may be related to the microstructure, which consists of a great number of fine Wo grains in this glass-ceramic.
Online since: May 2004
Authors: A. Erol, Ş. Talaş
X-ray analysis gave the good number of lattice parameter for Ni3Si, a = 0.3522nm, and has good agreement with index.
On the other hand, there is also possibility that the reaction will form a number of stable Ni3Si phases.
XRD analysis data of Ni plated SiC+Al powder prior to sintering V.B.V.Strong : Very broad very strong, Calculated for β-SiC, ao=0.4364 nm, Calculated for Ni, ao=0.3523 nm, Calculated for Al, ao=0.4051 nm The lines for this phase are extremely broad indicating very small grain size and/or considerable strain broadening.
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