Search results

This significant change is because the radius is a two-dimensional factor and the height is only one-dimensional.
It indicates that the radius of the void is a key factor influences the heat performance of IGBT.
Practically, IGBT devices with relatively larger voids tend to have poorer mechanical properties, thermal properties and heat dissipation.
The Cp-R characteristic curve reflects the thermal properties within the device, which has far-reaching significance to the study of internal structure and defects, and to the optimum structural design of IGBT.
Also, the horizontal and vertical coordinates of a void affect the changing rate of thermal distribution.

The underlying characteristic of these materials is their nanoscale grain structure, which can impart a variety of extraordinary material properties [2].
In terms of mechanical properties, they achieve their high strength via their grain size, which places limits on the amount of dislocation formation and motion available to accommodate plastic deformation, a correlation described by the well known Hall-Petch relation [3-5].
Values are within the range reported by other researchers; however, it should be mentioned that the mechanical properties of gold in particular are highly sensitive to minute impurity levels [20-22] and results may vary from lab to lab.
However, besides grain size, other factors such as texture and the columnar grain structure play a role.
Affects of the grain aspect ratio manifest most in films of the same thickness or when the ratios are very different.

Experiments Steel chemical composition and properties.
The chemical composition of the steel is shown in Table 1, while the mechanical properties of the steel at room temperature 20 °C are shown in Table 2.
Material properties.
The other temperature-dependent physical properties and mechanical characteristics are shown in Table 4.
Table 4 Thermo-mechanical material properties of the test steel Temp.

Introduction Concrete cracks are caused by many factors, and the mutual influences are complex[1].
Concrete thermal stress test can simulate and control the concrete specimens in different temperature histories and different constraint degrees[6], it is possible to test the characteristics and parameters of the concrete from the curing begins (such as zero- stress temperature, the cracking temperature, stress, volume deformation, coefficient of linear expansion, etc.), it can quantitatively evaluate the cracking sensitivity of the concrete with comprehensive factors in early age.
As we know, the concrete cracking is affected by its temperature history when it is restrained.
So the development of the concrete mechanical properties such as strength, elastic modulus will be faster than general in approximate adiabatic heating mode, which overestimated the highest temperature and the cooling point of the concrete and underestimated the actual cracking resistance.
Because the chemical deformation and the creep of concrete is complicated within the different temperature processes which is not a linear relationship, the generation of stress are related to the deformation, temperature, modulus of elasticity and other mechanical properties.

Effect of Milling Parameters on Surface Roughness for High-speed Milling of Pre-sintering Zirconia Junwei Liu1,a, Xiaojun Yang2,b 1,2Department of Mechanical Engineering and Automation, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China aljwxuan@gmail.com, byangxj@hitsz.edu.cn Keywords: High-speed milling, Roughness, Milling parameters, Sensitivity, Stability domain Abstract.
Zirconia has been widely concerned in dental restoration duo to its excellent properties, but its high hardness make direct milling inefficient, while pre-sintering zirconia has good machinability.
Roughness models are established on each parameter, and analysis results show the effect degree in order of spindle speed, feed engagement, cutting width, and cutting depth, spindle speed in them is a main factor.
Introduction Zirconia ceramic (ZrO2), which has been called ‘ceramic steel’, has attracted considerable interest in research of restorative dental materials for its excellent properties.
(2) As a whole, roughness curves are similar for spindle speed and feed engagement, while spindle speed change affects roughness further than feed engagement.

High strength, low density, and excellent corrosion resistance are the main properties that make titanium attractive for a variety of applications.
Non-aerospace applications take advantage mainly of their excellent strength properties or corrosion resistance [1] to [3].
The machinability of titanium and its alloys is generally to be poor owing to several inherent properties of the materials.
Table. 1 show the chemical composition of the pure titanium (grade-2) used for the experimentation; and also shows the mechanical properties of pure titanium (grade-2).
[9] F.H.Froes,T.L.Yau,H.G.Weidinger, Structure and Properties of Nonferrous Alloys, Chapter 8, Titanium, Zirconium, and Hafnium.

However, one of the important factors in affecting them is that the feeding method has not been given due attention when researching on open source machines. 
The results show that layer thickness is the most important factor for width and thickness deviations.
In most cases, surface roughness is used as a technical requirement for mechanical products.
If this value is exceeded, the plastic filament will be bent, greatly affecting the plastic extrusion process, clogging the extrusion head and can lead to damage to the extrusion head. 
S., Parametric appraisal of mechanical property of fused deposition modelling processed parts. 

With negative thermal properties of materials can be enhanced.
Byrappa[8] focused on the Na ion transport properties of NZP family compounds.
In this paper, CaZr4(PO4)6 ceramic powders were prepared by coprecipitation method, The CaZr4(PO4)6 ceramics were prepared by isostatic pressing and sintering, and the mechanical properties and thermal expansion coefficient of CaZr4(PO4)6 ceramics were studied.
The particle size distribution of CaZr4(PO4)6 powder The sintering temperature is an important factor affecting the properties of ceramics.
The low or high sintering temperature will reduce the properties of the materials.

The outcomes of the studies would able to identify the factors (which related to the material usage) that affecting the size of particles, which are crucial understanding in scale up processes.
As a result, the fabrication of nanoparticles did not affected by the PVAL concentration as compared to microparticles.
Prabha, Residual polyvinyl alcohol associated with poly( D,L-lactide-co-glycolide) nanoparticles affects their physical properties and cellular uptake, J.
Hurme, Effect of preparation conditions on the properties of microspheres prepared using an emulsion-solvent extraction process, Chem.
Kobayashi, Influence of the degrees of hydrolyzation and polymerization of polyvinyl alcohol) on the preparation and properties of poly(DL-lactide-co-glycolide) nanoparticles, Int.

The shape and size are controlled by the tube properties and the loads’ relations.
The deformed size affects the clearance between wheel and drill-pipe.
The deformation of URRS drill-pipe cross-section is affected by two factors.
So the vertical size is controlled by two factors.
The factor elongating the circumference length will also make the vertical size greater.