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Online since: February 2016
Authors: Hu Xie, Bei Jun Zhao, Shi Fu Zhu, Bao Jun Chen, Zhi Yu He, Deng Hui Yang, Wei Huang, Wei Liu, Zhang Rui Zhao
There are several main factors to affect high-quality ZGP crystal growth.
The two-zone vapor transport and mechanical oscillation method was used to synthesize high-purity and single-phase ZGP polycrystals.
The X-ray diffractometer (XRD), energy dispersive spectrometer (EDS), fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) were employed to characterize the properties of the synthesized compounds and the as-grown single crystal.
The upper-part temperature and the lower-part temperature were both raised to 1070 oC, combined by mechanical oscillation, which was used to make the raw materials mix uniformly and react completely.
Wernick, Ternary Chalcopyrite Semiconductors: Growth, Electronic Properties, and Applications, Pergamon Press, New York, 1975
Online since: January 2011
Authors: Zhi Li Zhong, Xun Gai Wang, Ju Sheng Qiu, Huan Guo
Additionally, we find that the number of hairiness of ring spun yarns with this system can be reduced to some extent, while yarn tensile properties are not as sensitive to be worse.
Yarn properties such as hairiness and tensile properties were investigated, too.
We also tested the tensile properties of these yarns on YG061 strength testing instrument, at a speed of 500 mm/min and at a pre-tension of 0.5 cN/tex.
Table 2 Tensile properties of yarns spun in different ways Yarn (tex) Breaking force (cN) Tenacity (cN/tex) Elongation rate (%) 43.0 T/C C 700.0 16.5 15.98 B 712.3 16.2 14.44 A 761.6 17.7 16.09 Summary In this study, we designed and equipped a balloon controller follow-up device control system on ring spinning frame and examined the simple idea of ring spinning with a balloon controller in a low spindle speed and how this modified path affects yarn quality.
The yarn tensile properties were not as sensitive to the change in installing the movable balloon controller.
Online since: May 2011
Authors: Sen Wang, Zhi Hui Li, Xin Liu, Huan Zhang
The central parts of the disks were further reduced to about 10μm by mechanical dimpling, followed by final polishing.
It showed that the influence of CaO only affect the reducing sintered samples within a certain range.
This is the reason why SiO2 containing sample hold oustanding anti-reducing property.
So, the outstanding anti-reducing peoperty of sample containing SiO2 can be thought from two factors: 1)protection layer of liquid phase covering on the grain surface and, 2) formation of BaTiO3-x with compact hexagonal structure.
This is the key reason why reducing atmosphere sintered sample hold the best anti-reducing property.
Online since: April 2019
Authors: Ramisha Sajjad, Sajid Ullah Butt, Khalid Mahmood, Hasan Aftab Saeed
There are certain parameters which can affect the filling percentage like weight of the model, amount of printing material being deposited, how long it takes to print an object and with what speed etc.
Mechanical properties and build time depend upon the infill patterns but this aspect is often ignored.
In this work, the influence of infill patterns on the printing time and mechanical strength is investigated.
Parameters details of each sample Printing Strategy Types Build Time (minutes) Weight (grams) Stress at Yield Point (MPa) Strength to Weight Ratio (MPa/grams) Homogeneous Type-I 48 13.15 16.3126 1.24 Heterogeneous Type-II 45 11.52 14.5149 1.26 Type-III 45 11.43 12.6553 1.11 Type-IV 46 11.92 15.4448 1.30 Type-V 45 11.49 12.0494 1.05 Factors Less than Homogenous Infill Patterns Factors More than Homogenous Infill Patterns Fig. 4.
Chart for build time and strength to weight ratio As we know the material usage, build time for printing affects the cost of part and the performance of printed part depends on strength to weight ratio.
Online since: December 2011
Authors: Jao Hwa Kuang, Tsung Pin Hung, Shian Huan Chiou, Chao Ming Hsu
For a given package, the misalignment of the fiber tip is determined by three key factors, namely the laser pulse energy, the welding sequence and the welding position [1,2].
PWS affects not only the coupling efficiency of the transceiver module [3,4], but also the bonding reliability [5] and the fiber shift in the fiber ferrule [6,7].
The model was constructed using eight-node hexahedral 3-D thermal-mechanical elements.
In performing the simulations, the material properties of the package components were assigned the temperature-dependent values.
A thermal-mechanical finite element model has been used to identify the welding sequence which minimizes the PWS within the package following the initial welding process.
Online since: August 2011
Authors: Su Bo Tian, Li Chun Qiu
Sylvester and Tesch invented a seedling array transplanter, which consisted of a transplant head, a pneumatically mechanical linkage, a carriage, and a computer controller [4].
End-effector First, under the condition of appropriate moisture content, some experiments of physical properties of plug materials such as gravity (G) and adhesion force (K) were conducted.
Horizontal transmission structures of mechanical arm is synchronousbelt and vertical is chain belt.
The experimental results showed that the precision positioning of mechanical arm in different positions of plug could be achieved, and the performance was reliable.
A rotatable orthogonal compose experiments under three conditions after selecting three factors were conducted.
Online since: October 2014
Authors: Zhen Dong, Ming Jia Feng
Introduction ADAMS software is developed by American MDI mechanical dynamics modeling, solving and visualization technology in the integration of mechanical virtual prototype simulation analysis software.
It is the world's most widely used and the most famous mechanical system dynamics analysis software.
Edit component and add constraints Import of component for editing color, position, name and other information material properties and add constraints
So considering the above factors, combined with the whole body is relatively complex.
University Mechanical Design Handbook (Fourth Edition) Volume 2 Beijing: Chemical Industry Press editor .2004.1 [4] Feng ChengYu.
Online since: August 2014
Authors: Yeong Maw Hwang, Gow Yi Tzou, Sai Chih Pan
It makes the energy consumption and affects the precision of product.
Lee et al. [3] used the upper bound method to establish an admissible velocity field to explore the flow stress and frictional factor in the ring and cylinder compression process.
The ring compression test can predict the flow stress and frictional factor.
The geometric profile of cylinder is conducted by 3D model, the elastic-plastic model is chosen and the material properties, such as Young’s modulus, Poisson’s ratio, density, were needed.
Chen, Master Thesis, “Stress Analysis of Non-uniform Cylindrical Compression Test,” Department of Mechanical Engineering at National Taiwan University, 1996
Online since: November 2011
Authors: Igor M. Razumovskii, Yu.Kh. Vekilov, Andrei V. Ruban, Vsevolod I. Razumovskiy, V.N. Butrim
The effect of B, Si, P, Cr, Ni, Zr and Mg on cohesive properties of Al and the special grain boundary (GB) Σ5 (210)[100], as well as their segregation behavior at the GB and the (210) surface are studied by first principles method.
We use the calculated properties to analyze the effect of the alloying element on the bond strength related properties of the alloy.
Cohesive property calculations.
It turns out, that almost the same elements that have a strengthening effect on the GB’s properties (negative η) strengthen the bulk of Al (positive χ) as well (see Table 2).
[10] Aluminum: Properties and Physical Metallurgy, edited by J.
Online since: February 2013
Authors: Piotr Kędziora
Microelectromechanical models were developed by Bent et al. [2] to predict the composite properties.
To choose the correct position of the actuator depends on many factors, such as the method of control, or due to vibrational behavior.
Physical (material) variables are associated with electro-mechanical properties of the analyzed structure with piezoelectric transducers.
Material properties depend inter alia on the structure, chemical composition, the process of manufacture.
The following optimization problems can be taken into account: – materials having different physical and chemical properties, – change of the mechanical properties of the individual layers (by changing of the fiber direction), – change of the volume fraction of the reinforcing material, – selection of a unit cell used to model homogeneous mechanical properties - such as the shape of the reinforcement in the cell, – change of the electric field [E].
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