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Online since: August 2025
Authors: Marwa M. EL-Tyieb, Adel M.A. Elhdad, Hussein M. Ahmed, Safaa M. Ragheeb
The data correlated with TEM findings, validating the nanoscale properties of the Al-NPs.
Their efficiency was analyzed based on their properties and morphology.
The Langmuir isotherm model implies that physical factors drive monolayer sorption.
The shape and size of nanoparticles significantly influence their properties.
It is particularly important because it impacts the solid-solution interface and the active sites of the adsorbent, affecting the efficiency of COD removal.
Online since: June 2015
Authors: Roberta Nipoti, Ulrike Grossner, Giovanni Alfieri
SiC Device Manufacturing: How Processing impacts the material and Device Properties U.
If the cost of the material has an economic impact on the finished product (electronic device), its crystal quality affects the electronic properties of the device.
Epitaxial growth results in the formation of point defects and, in a compound material as SiC, a wide range of intrinsic point defects can be found: C- or Si-related vacancies or interstitials, as well as their complexes can introduce electrically active levels in the band gap, ultimately affecting the electronic properties of the device.
In the following, we will discuss which defects arise during the main processing steps of device manufacturing and how they affect the electronic properties of the devices.
Summary Extended and point defects can severely affect the electronic properties of SiC devices.
Online since: October 2014
Authors: Aurelian Albut
Any product that requires a change in material properties within a metal sheet component can be improved by use of tailor welded blanks.
Material Properties The materials used in simulation are steel DP600 and aluminium AA5182 with the stress-strain curve presented in fig. 1, respectively fig. 2.
Mechanical properties Tensile Strength, Yield = 410 MPa Elongation at Break >= 16.0 % E = 207 Gpa Poissons Ratio = 0.280 Chemical composition C %0.122 Mn %1.460 Si %0.055 Al %1.270 Ti %0.006 B %0.0003 S %0.0010 P %0.013 Density = 2.700000e-9 kg/m3.
Mechanical properties Tensile Strength, Yield = 151 MPa Elongation at Break >= 21.0 % E = 69.0000 Gpa Poissons Ratio = 0.330 Chemical composition C r %0.100 Cu %0.150 Fe %0.350 Mg%4.00-5.00 Mn %0.200-0.500 Si %0.200 Ti %0.100 Zn %0.250 Other, each = %0.0500 Other, total %0.150 Fig. 1.
In the ideal situation the welding line should keep its initial position, but due to multiple forming factors the welding line is moving during forming process.
Online since: December 2007
Authors: Miroslav Cieslar, Miloš Janeček, Margarita Slámová, Vladimír Šíma
The precipitation kinetics, resulting dispersion of the agehardening phase and their correlations with properties were investigated by differential scanning calorimetry, transmission electron microscopy and tensile tests.
The differences in precipitate microstructure inherited from the pre-treatment affect precipitation kinetics during paint baking and result in different precipitate dispersion and sheet strength.
A solute clustering during the natural aging and a dissolution of the clusters during the artificial aging are the major factors responsible for the deleterious effects of natural aging.
The paper reports results of a study of the effect of processing schemes on the microstructure and properties of a TRC AA6016 alloy.
The microstructure inherited from the pre-treatment affects strongly the kinetics of precipitation during the paint baking procedure.
Online since: October 2013
Authors: Li Yun Pan, Xiao Ke Li, Jian Dong Liu, Lun Li
Properties of MSFAC Long-term Exposure to Sodium Sulfate Solution Liyun Pana, Jiandong Liub, Lun Lic and Xiaoke Lid School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450011, China aply67@ncwu.edu.cn, b971071615@qq.com, c190656296@qq.com, dlixk@ncwu.edu.cn Keywords: concrete; machine-made sand; fly ash; sodium sulfate attack; sulfate-ion concentration; chemical titration method.
Introduction Sulfate attack on concrete is a complex physical and chemical process which is affected by many factors.
The reasons are that some different characteristics such as coarse surface, angular shapes, and large content of stone powder of the machine-made sand compared with the natural river sand result in some different properties of concrete [8, 9].
Ordinary silicate cement of grade 42.5, machine-made sand, crushed limestone and F-class fly ash with lower content of calcium were used; their physical, chemical and mechanical properties are listed in Table 1 to Table 5 respectively.
Table 1 Physical and mechanical properties of cement Grade Fineness (%) Water content of standard density (%) Setting time (min) Compressive strength (MPa) Tensile strength (MPa) Initial Final 3d 28d 3d 28d 42.5 4.6 26.74 208 247 18.8 57.5 4.7 8.7 Table 2 Chemical composition of cement Chemical composition SiO2 Al2O3 Fe2O3 CaO f-CaO MgO SO3 K2O Na2O Alkali Weight percent (%) 31.43 12.43 3.34 41.28 0.76 4.25 3.22 0.80 0.43 0.97 Table 3 Properties and chemical combinations of fly-ash (%) Fineness Ignition loss (%) Water demand ratio (%) SO3 MgO SiO2 Fe2O3 Al2O3 CaO Na2O K2O 13.6 5.17 100 0.50 1.47 52.91 4.85 26.91 4.7 0.42 1.60 Table 4 Physical properties of machine-made sand Series (mm) Fineness modulus Apparent density (kg/m3) Bulk density (kg/m3) Closed volume density (kg/m3) Content of stone-powder (%) 0~4.75 3.5 2720 1475 1700 4.6 Table 5 Physical properties of coarse aggregate Series (mm) Apparent density (kg/m3) Bulk density (kg/m3) Crush index (%) Mud content
Online since: December 2016
Authors: Jian Ming Gao, Bing Qi, Da Man Shen
The chemical compositions and properties of binder materials are shown in Table 1.
The properties of NCA and RCA are shown in Table 2.
Table 1.Chemical composition and physical properties of binder materials.
Conclusion The following conclusions can be drawn from studying the various factors related to the inclusion of RCA on the chloride resistance of concrete: l The incorporation of increasing amounts of RCA causes greater free chloride content assuming all other factors are equal.
Alves: Mechanical properties of structural concrete with fine recycled ceramic aggregates, Constr Build Mater, Vol.64(2014), p.103–113 [11] H.W.
Online since: September 2011
Authors: Nong Zhang, Jia Guang Kan, Guang Yao Si, Hai Wei Zhang, Zhi Yi Zhang
The mining of upper coal seam, mechanical properties of roadway surrounding rock and the vertical distance between roadway and upper coal seam were three key factors of roadway maintenance and rational arrangement (Shi-Liang Lu, 1984 and 1993)[1,2].
The displacement of roadway surrounding rock under condition of close cross mining is seriously affected by the overall displacement field after msining (Wen-Bing Xie, 2001)[4].
Fig. 2 Numerical calculation model According to geological data provided by Dingji coalmine, we selected the rock mechanical parameters as shown in Table 1.
Mining pressure began to affect roadway while the size of coal pillar was 105 m, as the face kept on advancing, the effect of mining become more intensive.
(3)Rock grouting Rock grouting can fill the weak side and cemente surrounding rock and weak plane together again to improve the overall stability and physical and mechanical properties of roadway surrounding rock.
Online since: March 2010
Authors: Yi Min Xia, Xi Wen Zhou, Jing Xue, De Zhi Luo
In the process of shield machine tunneling, a variety of strata will be encountered, which are significantly different in physical and mechanical properties [1, 2, 3].
And the cutter should bear the random loads which change remarkably, so the strength and rigidity of the cutter-head could be an important factor to affect the safety of shield tunneling.
The arrangement of cutters, which serves as direct tools to cut the rock, could directly affect the mechanical properties of the cutter-head.
Based on the analysis in the CAD/CAE, the measures were put forward to improve the cutter arrangement, so the mechanical properties of cutter-head could be improved.
Therefore, when the mechanical properties of the improved cutter-head are checked, only the analysis of cutter-head in the worst geological boundary conditions is adopted.
Online since: November 2012
Authors: Xiao Dong Liu, Yun Tao Sun, Guo Peng Tian, Hong Shuang Han
Baseball required specialized sportswear, baseball equipment currently on the market on the style design is reasonable, but the fabric and lining materials used have not reached fully meets the ergonomic requirements of, heavy protective clothing have certain restrictions on the players ' actions, affecting the level of players play.
Figure 1 Basic baseball action Figure 2 The collision in the game Sports injury site statistics as follows: head, shoulders, chest, hip, wrist, knee and other parts of the damage probability [5] [ 6] .Analysis, this result is mainly attack and defense, and to keep the players in the competition intense body collision, when players touch base with playground competitive factors such as sliding friction and other factor.
D3O molecules is a commercial secret, belonging to "the expanding foam" material, is also a kind of "smart molecules" composed of impact resistance of a single material, can be presented in different gravitational impact of different mechanical properties of both hard and soft.
D3O material physical properties and the principles of application .D3O material in the micro level under normal conditions , the internal molecular arrangement is not very close , so the macro D3O material to maintain a state of relaxation , soft and flexible ; once was a severe impact or squeeze when the intermolecular immediately locked together to form each other hook with the flexibility of molecular chains will rapidly within 1 / 1000 seconds tightening harden to form a layer of protective coating , which digest the external , and the stronger the force of impact , the faster the reaction ; when the external force disappears , the material will return to its initial the relaxation of soft shells state .
Online since: May 2007
Authors: Song Zhang, Jian Feng Li, Xing Ai, Xiu Li Fu
Fu1 1 School of Mechanical Engineering, Shandong University, China a zhangsong@sdu.edu.cn, baixing@sdu.edu.cn Keywords: HSK spindle/toolholder interface, High-speed machining, Interference fit Abstract.
Introduction The performance of the spindle/toolholder interface is one of the important factors affecting machining quality.With the increase of cutting speed, the steep spindle/toolholder interface with a long 7/24 taper does not meet the desired level of the accuracy and the repeatability of positioning of the cutting tool as well as the axial and radial contact stiffness of the interface [1, 2].
The material properties of the spindle and the toolholder were shown in Table 1.
Table. 1 Material properties Young's modules E [N/mm 2 ] Poisson's ratio ν Density ρ [Kg/m 3] Coefficient of friction μ 206×10 9 0.3 7.86×10 3 0.2 Finite Element Simulated Results Effect of Centrifugal Force on Deformation.
Therefore, the appropriate interference between the spindle bore and the toolholder shank was the critical factor to make the taper and the flange contact simultaneously.
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