Search results

Aging time and formulation were two key factors for the control of the aspect ratio of the precipitates.
Besides, the hardness of CeO2 is suitable for semiconductor technique, it recently was used as the media for chemical mechanical planarization (CMP) of Si wafer [4,5].
The cerium element belongs to lanthanide cations, which incompletely occupies 4f-shell, the CeO2 with various types of doping species usually have interesting optical properties and important applications in optoelectronics [6,7].
The [C6H8O7] would affect the morphology of the precipitate, changing from flake-shape (Fig. 3(c)) to bundle-type (Fig. 3(d)).
Conclusions The pH value and [NaOH]/[C6H8O7] ratio of the solution are key factors for the control of the morphology of CeO2 ppt.

Brasses, bronzes and other copper alloys produced by powder metallurgy methods have the physical and mechanical properties of their cast or wrought counterparts.
To increase density and mechanical properties of the samples obtained they used sintering.
Nevertheless, it is necessary to arrange extra investigations of sintering in the air and estimate influence of sintering modes on physical and mechanical properties of samples.
The new copper based powder materials: structure and properties, J.
Fabrication of Carbon-Copper Composites Using Local Carbon Material: Microstructure, Mechanical, Electrical and Wear Properties, J.

Due to the developed pore structure, high specific surface area, low cost, accessible raw materials and stable physical and chemical properties, activated carbon has caused high attention of society.
In this process, a certain proportion of activation agent is added to the carbon source to carry out modified impregnation treatment, then the AC with special properties is prepared through high temperature carbonization and activation.
The conditions for the regeneration of ACs are determined by the type of activated carbon and the properties of adsorption materials.
Biological regeneration method has the advantages of simple operation, low operation cost, but the rate of biological decomposition is too slow, the regeneration time is very long, and the regeneration efficiency is affected by many factors.
(In Chinese) [7] L.P.Wang, Preparation and Capacitive Properties of Ordered Mesoporous Carbon-based Materials for Electrochemical Supercapacitors (Ph.D., Dalian university of technology, China 2012), p.9

Preparation and Mechanical Properties of Ultra-fine Grain Medium-carbon Steel Based on Equal-channel Angular Pressing Jianmin Wang1*, Wentao Hou1 , Lin Lu1 1School of Material Science and Engineering , Jiangsu University, Zhenjiang，Jiangsu，China *Corresponding author, email:jmwang1959@126.com Keywords: Equal-channel Angular Pressing(ECAP), Martensite Phase Transformation, Ultra-fine Grain, Severe Plastic deformation, Zener-Holloman Parameter Abstract: A new technology of preparing submicron medium-carbon steel quickly using martensitic steel by equal-channel angular pressing is developed.
Severe plastic deformation (SPD) is the most effective way to refine grains, perfect the microstructure and improve the comprehensive performance of materials. 1-5 But only on the condition of great deformation degree can submicron ultra-fine grains be acquired.6 During SPD, due to factors such as crystal structure of steel, deformation mode, etc., plastic deformation mechanism is different, and thus the plasticity performance and the process of grain refinement are affected.
The crossing angle φ of the two channels affects the deformation degree.
Xu Xiao-jing .et al, China Mechanical Engineering, 2006, 17 (S2), 384-387
LU Jin .et al, China Mechanical Engineering, 2006, 17(24), 2618-2621, 2627

CRH3 type EMU operate on the Beijing-Tianjin high-speed line, because of its high speed, wheel load conditions change often, coupled with the track’s irregularity and other factors, so that the wheel is under a complex random loading, therefore, the analysis method study of the wheel’s fatigue strength is very important.
The model is based on ensuring the premise that the mechanical properties of original structure does not change, and the non-critical area characteristics can be ignored to simplify model, in order to improve the subsequent finite element post-processing and finite element analysis of solution efficiency.
In the stress - time history, the stress cycle can affect the fatigue life.
Distribution of wheel safety factor is shown in Figure 4.
Fatigue safety factor of the wheel is above 1.376, which can meet the requirements of the fatigue life.

The Factors Which Impact On Bus Seat Comfort There are two aspects which influence the comfort from buses, they are bus vibration and ergonomic factors.
Comfort is influenced mainly by dynamic and static factors.
The Physiological Properties of the Human Body Sitting Posture In the study of the human body feeling of the vehicle vibration, different body parts were in different stress state to feel the same vibration environment, and central nervous system would have different reactions, that were different feelings of comfort.
Generally, hydraulic or mechanical adjustment was adopted.
In running state, due to vibration and other factors, the human body was easy to slip forward, then the waist and back here to stay in an angle, the waist impended.

The mechanical and thermal properties of the materials of bodies in contact influence the extraction of heat at the interface [10].
Analysis of Variance (ANOVA) technique was used to determine the statistical significance of various factors that affect the thermal contact resistance (TCR).
The factors considered in ANOVA are materials in contact, load and interface materials.
The peak temperature and the heating rate of the cold material depend on thermophysical properties, applied load and the TIM.
Factorial experiments carried out suggest that the applied load plays a significant role in minimizing the thermal contact resistance compared to other factors.

Bond strength and its factors The mechanics of bond stress transfer between FRP reinforcement and concrete has been investigated extensively.
Benmokrane et al. [11] did experiments on the mechanical properties and bond strength of carbon fiber fiber reinforced polymer on the mechanical properties and bond strength of new generation of carbon fiber reinforced polymer (CFRP) reinforcing bars used as nonprestressed reinforcement for concrete structures.
Brahim, Influential factors of bond properties between fiber reinforced polymer (FRP) rebars and concrete, Industrial Construction. (2001)
[10] Javier malvar L, Tensile and bond properties of GFRP reinforcing bars.
Lord, Mechanical and bond properties of new generation of carbon fibre reinforced polymer reinforcing bars for concrete structures.

Stress-based performances of four commercially-available dental implant systems are evaluated in detail, demonstrating that implant and bone stability is strongly affected by implant-abutment connection structure as well as by a number of geometrical parameters.
A key factor for the success or failure of a dental implant is the manner in which stresses are transferred to the surrounding bone [1].
And 0.5 mm of element size is utilized as the meshing requirement for all the FE models Materials Properties.
Mechanical properties of the materials are shown in Table 1.
Table 1 Isotropic materials properties used in the study Material Young's modulus(GPa) Poisson ratio (v) Yield strength (MPa) Titanium CP 117 0.30 462 Ti-6Al-4V 110 0.32 800 Gold alloy 100 0.30 565.4 Table 2 Elastic coefficients for cortical and cancellous bone used in the study Ex(GPa) Ey(GPa) Ez(GPa) Gxy(GPa) Gyz(GPa) Gxz(GPa) v xy vyz vxz Cortical bone 12.6 12.6 19.4 4.85 5.7 5.7 0.3 0.39 0.39 Cancellous bone 1.148 0.21 1.148 0.068 0.068 0.434 0.055 0.055 0.322 Results and Discussion Maximum von-Mises (EQV) stresses that occurred at the bone, implant, abutment and screw of the four FE models for the loading condition are presented in Table 3 and the stress distribution are shown in Fig.3.

The material properties are assumed to vary continuously in the axial direction according to a power law.
The FGMs are formed by varying percentage of materials components in the desired direction, and as a result, the specific physical and mechanical properties of the formed material can be obtained.
A Poisson’s ratio υ = 0.3 and a shear correction factor ψ = 5/6 is used in computation.
It is clearly seen from the figure that, the material non-homogeneity has great effect on the deflection factor, regardless of aspect ratio.
As seen from the figures, the dynamic responses of the beam are greatly affected by the distance between the loads and the number of loads as well.