Search results

Bone volume and bone quality properties are fundamental prerequisites to ensure optimal mechanical stability of the implants and further osseointegration [11].
The aim is for these plates and screws to exhibit robust mechanical properties and achieve optimal results.
Injection of IBS paste into the pedicle screw also resulted in improved mechanical properties from the pull-out test results as shown in Figure 5.
The Biomechanical Properties of Cement-Augmented Pedicle Screws for Osteoporotic Spines.
Design factors of lumbar pedicle screws under bending load: A finite element analysis.

Deviprasad's VPAVE has analyzed how the actual factors in machining process influencing product assemblability [7].
The factors that affect actual assembly process should be considered.
Human-related factor is one of the most important factors during assembly process.
Assembly process modeling considering machining and assembly factors.
Furthermore, some factors such as environment temperature and assembly force may cause parts elastic distortion during assembly process.

Introduction Due to their inherent advantages such as low density, high damping properties, good machinability and EMI shielding, magnesium (Mg) alloys have gained an increasing attention as a society-supporting material together with preceding structural Al alloys and steel.
Among them, lightness is an essential factor for transportation vehicles and portable IT products, but in view of safety, crashworthiness and comfortableness, high damping characteristics of the Mg alloys to suppress unwanted noise, irregular vibrations and resulting structural instabilities are also very important [1-2].
AZ91 (Mg-9%Al-1%Zn-0.2%Mn) is the most preferred structural Mg casting alloy owing to its best combination of castability, room temperature mechanical strength and corrosion resistance.
In spite of numerous researches on microstructures and mechanical properties for the aged AZ91 alloy, however, few works have been carried out on its damping capacity.
The 1 hour of aging leads to the peak level of damping capacity and further aging affects to lower the damping capacity gradually.

These phenomena will affect the microstructure of the formed part and play an important role in determining the mechanical properties of the deformed products.
Therefore, it is very important to investigate and understand the effect of deformation process parameters on the microstructure evolution in order to improve the mechanical properties of the products.
Ebrahimi et al. studied the dynamic recrystallization behavior of a superaustenitic stainless steel by hot compression test and investigated the effect of deformation temperature and strain rate on the flow stress during dynamic recrystallization by using the hyperbolic sine equation [5]. 20CrMnTiH steel is a low-carbon steel widely used as a gear material in China due to its high hardenability, anti-wear properties after carburization and quenching, and low temperature impact toughness [6-8].
The isothermal hot compression tests were carried out on the Gleeble-3500 thermo-mechanical simulator.
The friction between the dies and the deformed blank was assumed to be of shear type and the friction factor was set as 0.3.

Modeling of the structural system in ETABS began with establishing a coordinate grid and story levels, defining material properties, and specifying the cross-sectional dimensions of all structural members.
Dead Load Values on Rooftop Load Type Weight [kN/m2] Waterproofing 0,28 Ceiling and hangings 0,20 Mechanical and electrical 0,25 Total 0,73 Table 3.
The imposed live loads were applied without any live-load reduction factors.
The principal properties used in the analysis are listed in Table 6.
Interstory drift was computed as the relative lateral displacement between consecutive floor levels under the design earthquake and then adjusted by the appropriate code factors: Cd/Ie for the fixed-base model and RI/Ie for the base-isolated model.

Abrasive in slurry is a significant factor to removal rate, surface roughness and defect.
Due to the bad suspension property of PMMA particles, PMMA particles with large diameter were found to be agglomerate in slurry.
The polishing pressure affects the numbers of active abrasives and friction force by varying the contact area between composite abrasives and wafer.
Parka: A chemical mechanical polishing model incorporating both the chemical and mechanical effects.
Ehrenstein: Polymeric Materials - Structure, Properties, Applications.

Numerous studies on the thermophysical properties of nanofluids have been conducted in order to enhance heat transmission and thermal efficiency [20-27].
Furthermore, they found that the shape of the nanoparticles is an important factor affecting the thermophysical properties of the mixture including thermal conductivity and viscosity.
The thermophysical properties of nanofluids are assumed to be constant except for the density in the buoyancy term, which is modeled using the Boussinesq approximation. 6.
Thermophysical properties of CuO/water and TiO2/water nanofluids Thermophysical properties for water H2O and used nanoparticles, TiO2 and CuO are presented in Table 1.
Thermophysical properties formulas for nanofluids: Properties Formulas Density Specific heat Volumetric expansion coefficient Thermal conductivity Maxwell [39]: Pak and Cho [41] (experimental): TiO2, Lee et al. [42] (experimental): CuO/water Viscosity Brinkman [40] Pak and Cho [41] (experimental) : TiO2/water, Nguyen et al. [43] (experimental) : CuO/water, Table 3.

Since then, it has been the most dynamically studied material because of its unique structural, electrical and mechanical properties as well as chemical stability [2-5].
It was highlighted also that size of the catalyst particles would be another factor in governing the CNTs growth rate [15].
Results and Discussions The FESEM cross-sectional images in Figure 1 reveal that the PECVD time did affect the MWCNTs growth.
Table 1 shows that the PECVD time is not significant in this experimental setting and barely affect to the changes of the MWCNTs diameter size.
Ounaies, “Electrical properties of single wall carbon nanotube reinforced polyimide composites,” Composites Science and Technology, vol. 63, no. 11, pp. 1637–1646, Aug. 2003

Based on different steering power sources, the steering system can be divided as mechanical steering and dynamic steering.
Affect on Ride Performance and Comfort.
In sum, we should fully consider the impact of various factors, according to the overall objective function optimization to determine the engine start/stop strategy.
Frequently starting/stopping the engine during the moving will bring drivers some psychological pressure, and even psychological panic and lack of driving confidence, thereby affecting the judging of driving and the accuracy of operation [9].
Xue, etc: Chinese Journal of Mechanical Engineering, Vol. 44 (2008) No.4, pp.87-91.

A series of parameters such as power factor, active power and reactive power which change with the voltage and frequency are chosen to demonstrate the load components characteristics in load modeling. [1]Load model is the mathematical expression of the depicted bus power varying with the bus voltage and bus frequency.
As a vital composition in power system, load model is tough to build accurately due to its complexity, distribution, variation and stochastic properties.
(1) (2) Rotor motion equation, electromagnetic torque equation and mechanical torque equation are expressed as (3), (4) and (5) respectively
In order to describe load time-varying property, a parameter is defined as (8), which is to define the initial active power proportion of the equivalent motor in the composite load model
The Synthesis load model structure taking account of the distribution network solves the problem that network impedance affecting the load model accuracy.