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Online since: November 2012
Authors: Ying Xue Sun, Song Chen, Shuai Ran Cheng
There are two groups of fissures in the rock mass and they weaken the mechanics properties little.
The bedding plane determines the mechanics properties of rock mass.
The mechanics properties of rock mass are determined by both fissures and soft rock.
The mechanics properties of rock mass are determined by both bedding plane and the fissures.
The minimum safe factors of various positions of Xishan Slope are shown in Table 5.
Online since: September 2014
Authors: Ho Sang Ahn, Jin Chul Joo, Byung Kwon Jung, Jae Ro Park
Introduction Asbestos have been widely utilized in building materials, especially to the applications such as fire blankets, pipe insulation, fireproof fabrics due to its great thermal and mechanical properties.
Experimental methods Asbestos contacting materials were prepared to obtain the standard properties of chrysotile in various building materials.
Asbestos detection box was made to measure the light intensity in a closed and dark atmosphere to exclude other factors as shown in figure 1.
It means that intensities of reflected light decreased, but did not affect optical property of chrysotile under this condition [5].
Small peak at around 430nm was not affected by both color filter and additives.
Online since: November 2011
Authors: Jia Mao, Wei Hua Zhang
Some deficiencies were presented for both two-dimensional and slice model if multiple chips are deployed in one package: the models have difficulties in reflecting all factors.
Material properties and size information for every layer are shown in TABLE.I-TABLE.II, and (=1,3,4,…8) denotes thickness parameters.
Material properties and layer thickness of BGA TABLE II.
The main factor affecting the scale of FEA model is the geometry of solder ball, and some methods have already been put forward for simplification, such as replacing the solder balls with equivalent beams[4][12], degenerating the solder ball into column[10] or block[11] shape, etc.
Reliability Modeling for Ball Grid Array Assembly With a Large Number of Warpage Affected Solder Joints [J].
Online since: March 2013
Authors: Mohamad Rusop Mahmood, A.S.M. Rodzi, Mohamad Hafiz Mamat, M.N. Berhan
The optical properties showed when increased annealing temperatures, so the high UV was transmit.
The properties of thin films are affected by several factors such as annealing temperature [3], annealing time, annealing ambient [4], and type of substrate used [5].
At UV range, the absorbance characteristic was high due to its wide band gap properties.
The optical properties of the thin films have been investigated.
Zoolfakar, Study on Electrical Properties of Zinc Oxide Thin Film, (2008) 123-126
Online since: April 2011
Authors: José Divo Bressan, Celso Antonio Barbosa, André Marcon Zanatta, Jefferson De Oliveira Gomes
Some properties commonly considered include the surface integrity or surface damage, surface roughness, subsurface and surface hardness, microstructure and residual stresses.
The tool edge geometry is the dominant factor determining the residual stress profile [3].
A greater negative rake angle of tool insert gives higher compressive stresses as well as a deeper affected zone below the surface while cutting depth does not affect residual stresses [1][4].
Polishability is defined as a measure of how easy it is to perform surface polishing in tool steels, being affected by various metallurgical factors.
The polishing level affects the transparency or how the injected polymer part will absorb or reflect light.
Online since: October 2013
Authors: Zhan Qiang Liu, Guo Sheng Su
Experimental study on specific shear energy in high-speed machining 7050-T7451 Guosheng Su 1,a and Zhanqiang Liu 2,b 1 School of Mechanical & Automotive Engineering, Shandong Polytechnic University, Jinan, Shandong 250353, China 2 School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China asuguosheng@sina.com, bmelius@sdu.edu.cn Keywords: Specific shear energy; High-speed machining; Aluminum alloy.
Introduction Specific shear energy consumed in metal cutting for chip removal is one of the important factors to evaluate the machinability of metals.
However, it is difficult to predicated specific shear energy accurately because material properties, cutting conditions, and tool geometry can all affect it.
The main mechanical and physical properties of 7050-T7451 are: yield strength 455MPa; tensile strength 510MPa; density 2830Kg/m3; thermal conductivity 157W/(m·°C); specific heat 860J/(Kg·°C); melting temperature 635°C.
Online since: June 2016
Authors: T.P. Singh, Ajay Batish, Rupinder Singh, Sanjeev Kumar
Further the migration of different elements and formation of compounds on the machined surface was investigated using EDX and XRD analysis. 1.0 INTRODUCTION Ti and its alloys have wide industrial applications in the area of aerospace, automotive, medicine for medical prostheses due to their excellent corrosion resistance, light weight and mechanical properties.
Due to its stated properties as well as requirements of precise machining, the traditional machining processes results in high machining cost and degradation of machining performance.
However, due to this high temperature, the mechanical and metallurgical properties of machined parts may be affected adversely.
Peak current was identified as the most significant factor followed by pulse-on-time affected the micro-hardness.
Journal of Mechanical Science and Technology 2014, 28 (7), 2831-2844
Online since: May 2009
Authors: Andreas Öchsner, Markus Merkel, Marco Speich, Wolfgang Rimkus
For metallic hollow sphere structures (MHSS), only fewer published works are found in the open literature and are mostly related to the elastic properties and initial yield behaviour [15-20].
At this point properties of the model like size of the simulation model, material behaviour and material properties, symmetrical and periodical boundary conditions, dynamic factors and additional mesh properties are defined.
Figure 6 shows how the Young's modulus was varied and how it affects the first steps of the simulations.
The results are the same for both material cards, so the different properties, as mentioned above, don't matter for the simulations.
Ashby: Cellular Solids: Structure and Properties (Cambridge University Press, UK 1999)
Online since: December 2011
Authors: Jian Hua Yao, Miao Zhang, Wei Fu Wang, Y.G. Zheng
Effects of the Particle Size Variety of Metal Oxide on the Absorption Property of Long-wavelength Infrared Laser Weifu Wang1,3,a, Yugui Zheng2,b, Jianhua Yao1,3, Miao Zhang1,3 1 Key Laboratory of E&M (Zhejiang University of Technology), Ministry of Education & Zhejiang Province, China, 310014 2 State key laboratory for corrosion and protection, Institute of Metal Research, China, 110016 3College of Mechanical engineering, Zhejiang University of Technology, China, 310014 a wwfphd@yahoo.com.cn, bygzheng@imr.ac.cn Keywords: Metal oxide, Absorption capacity, Particle size, Long-wavelength infrared laser Abstract.
In order to study the influences of aggregate size on CO2 laser absorption property, several special absorbing coatings were prepared from four kinds of different particle sizes (45 μm, 13 μm, 6.5 μm and 1.6 μm) TiO2 powder.
Through the comparison of surface morphologies and the quantitative area analysis of heat affected zone, the effects of particle size variety on absorbing capacity are investigated.
Form the figures obtained by OM observation, the laser heat affected zone (LHAZ) could be identified and the areas of the LHAZ on cross-section were calculated by a software “Image J”.
Coefficient K is the affect of other factors on S0 and S1.
Online since: March 2024
Authors: Hala Al-Jawhari, Areej Aljarb, Farah Ma'ashi
Transition metal dichalcogenides (TMDCs) nanomaterials, in particular Molybdenum disulfide (MoS2), have been employed frequently as a basis for flexible gas sensors due to their extreme sensitivity to gas molecules, super mechanical and electrical properties, and large surface area.
Results and Discussion For sensors based on MoS2, most reports have shown that the difference in the main factors in the preparation affects the way the sensor responds to the target gas [21, 22].
The sensitivity is described the smallest disruption of properties that causes a noticeable change.
Therefore, the gas sensor's performance can be improved by adjusting the sensing material with specific properties.
[14] Vargas-Bernal, R., Electrical Properties of Two-Dimensional Materials Used in Gas Sensors.
Showing 16581 to 16590 of 25950 items