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Online since: December 2023
Authors: Andrey N. Dmitriev, Galina Yu. Vitkina, Roman V. Alektorov, Elena A. Vyaznikova
The number of silicate bonds in the sinter is determined by its basicity (CaO/SiO2 ratio or (CaO+MgO)/(SiO2+Al2O3)).
In accordance with the Russian State Standard 25732-88, the measurement of specific or true density was carried out by weighing the sample in a pycnometer without liquid and with a known liquid (ethanol), and then calculating the ratio between the mass of the solid and its occupied volume, without considering the volume of pores inside the grains and the volume of voids between them.
Bulk density was measured by weighing in air and water, and then calculating the ratio of the mass of the sample to its occupied volume, including the volume of the pores inside the grains.
Online since: January 2010
Authors: Masahiko Demura, Toshiyuki Hirano, Dang Moon Wee, Hye Youn Lee, Y. Xu
It should be noted that the γ matrix was homogeneously etched, although the foil consisted of the recrystallized grains with the various crystallographic orientations [9]; for example, one of the grains is shown by the dotted lines in Fig. 1(a).
The surface morphology was changed with the etching time: a number of the exposed γ´ particles increased; and the roughening occurred on the surfaces of the γ´ particles with a fine dimple structure.
Online since: September 2013
Authors: Guang Li
Uygur architectural decorative patterns classification and the development and application of information technology GuangLi1 Xinjiang Construction Vocational and Technical College, China Email:xjlg5677@163.com Keywords: Uygur architectural decorative patterns;Geometric pattern;Plant grain;Text lines and Classification of patterns;Patterns of development and application of information technology Abstract:Uygur architectural decorative patterns is an important part of Chinese traditional culture , which is reflect the history of the nation's art form.
At second ,patterns stored in paper records are also facing problems susceptible to corrosion and damage; Third, mastering the craft of decorative patterns Uyghur craftsmen in the community is not given more attention, there is no economic security, the number gradually reduced, resulting in the loss of the traditional process gradually.
Online since: September 2019
Authors: S. Boulahrouz, N. Brinis, Oualid Chahaoui, Mohamed Lamine Fares, Badreddine Regaiguia
More often than not the manufacturing process of the metal alloy induces certain preferred crystallographic orientations and therefore, most metals exhibit a crystallographic texture [1], for two reasons: (i) continuous recrystallization occurs during hot working, which precludes randomization of grain orientations, and (ii) no phase transformation occurs upon cooling.
The identification of these parameters requires usually high number mechanical tests in different directions following loading paths.
To ensure a certain precision of parameters, the number of experimental data should not be lower than the number of material parameters considered in the identification operation [13].
(6) Note that all these variants imply Since formability of any sheet is characterized by mechanical parameter that is primarily related to the size and shape of grains, drawability is usually related to the r-value, which is defined as the ratio of the true strains in the width and in the thickness directions, respectively.
· The Hollomon hardening law is: · The Ludwick hardening law is: · The Swift hardening law is: and · The Voce hardening law is: In order to quantitatively evaluate the theoretical yield stress-strain relations, using an error function for each stress-strain relation: (17) Where n is the number of the experimental points; and are the experimental stress and the corresponding theoretical stress, respectively.
Online since: September 2019
Authors: Bachir Merzoug, Yassine Djebbar, Abdelmoumene Guedri, Racim Boutelidja
The sensitivity of this material to cracking by SCC is due to the precipitation of chromium carbide at the grain joints learning immediately adjacent areas of the grain joints with a lower chromium grade [1].
Table 5: Studied cases Studied case Case1 Case12 Case13 Case14 Case15 Oxygen concentration (ppm) 0.2 0.05 0.01 0.1 1 Fig. 11 presents some information on the number of the initiated cracks at the beginning of the time increment during the experiment (first number of cracks), and Fig. 12 presents the number of the initiated cracks in the time increment (total initiated cracks: initiation and coalescence).
Fig. 12: Total number of initiated cracks with time.
Online since: January 2014
Authors: Shao Hong Peng, Sha Liang, Jian Li, Mei Yu, Yan Huang
In recent years, a large number of toxic and hazardous substances were discharged into environment because of the simple landfill and accumulation of vehivle dismantling waste.
Observation on the residue powder of two samples has revealed that the powder composition of Guangzhou sample is mainly composed by sediment while that of Qingdao sample are organics such as polymer materials, wood and a few glass and metal grains, which indicates that the content and distribution of material in those two samples vary greatly, though they are originally composed by the same materials,such as plastic, rubber and metals.
Online since: August 2011
Authors: Hua Sun, Xiao Fei Guo, Ke Gao Liu, Hong Fang Ma, Li Ming Feng
By electron energy spectrometer,X-ray diffractometer,transmission elec-tron microscopy andmicro-hardometer,the depositing speed of electrolessNi-Co-P plating baths,chemical composition,crystal structure and microhardness of the alloy coatings were inspected and analyzed with ultrasonic and rare earth metalcerium intervening in electroless Ni-Co-P plating·The results show that the depositing speed of electroless Ni-Co-P plating isobviously increased under the effect of ultrasonic.The chemical compositions of electroless Ni-Co-P plating are changed,The XRD of coating has a diffuse sexual diffraction peak closing to typical amorphous structure.the obtained Ni-Co-P coating has more fine crystal grain, even and dense surface morphology.
Thirdly, instant high temperature generated by cavitation effects increases molecular collisions, increases the number of molecules, making activated molecular ratio increases and also accelerates deposition rate of metal ions. [10-11] After joining ultrasonic, coating hardness also rises and quality loss also reduced correspondingly, thus the abrasion resistance of coating improves.
Online since: November 2013
Authors: Zhuo Ying Xia, Kun He Lan, Hao Wei Hu, Cong Qun Wu
Using chitosan as raw material,the modified chitosan was obtained through alkylation reaction with alkyl halide, which as a carrier, Cu2O/ modified chitosan composite photocatalyst was prepared by hydrazine hydrate reduction.Using the method of X-ray diffraction and scanning electron microscope analysis, characterization of the composite photocatalyst show: Cu2O loads evenly on the modified chitosan, and the structure of Cu2O changes little, grain size of Cu2O is about 200nm~300nm.Using UV mercury lamp as the light source, alizarin red as target degradation product, photocatalytic performance of the Cu2O/modified chitosan photocatalyst was researched.The results show that: As the loaded modified chitosan produces a synergistic effect with Cu2O, its degradation rate of the dye improves in the UV mercury lamp,when the concentration of alizarin red is 50mg/L of the experimental conditions, the composite catalyst dyedegradation better than separate Cu2O catalysts and modified chitosan
Figure 1b shows, the molecular structure of chitosan, large number of hydroxyl and amino distribution in its molecule, hydrogen bonds formed between them, resulting in crystallinity chitosan molecules is very strong.
Online since: October 2014
Authors: Wen Bin Cao, Jun Na Xu, Peng Sun, Ming Guan, Wen Xiu Liu
The grain size was about 10 nm and the specific surface area of the powders ranged from 160 to 166 m2/g.
Gai proposed employing passivated co-doping nonmetals and metals to enhance the visible light response based on first principle electronic structure calculation[5] and a number of original experimental works on co-doped TiO2 have been reported [6-8].
Online since: April 2015
Authors: Hui Chen Yu, Cheng Li Dong, Ying Li
A number of creep rupture experiments of DZ125 alloy are carried out at 760oC, 850oC, 980oC and 1040oC.
This is mainly due to the presence of γ’-reinforced phase and further enhanced by aligning the grains along preferential direction using directionally solidification technique.
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