Search results

In order to increase the generated electricity from TENGs, the properties of these electrodes should be modified.
These include electrical and mechanical properties such as electrical conductivity, flexibility, natural frequency, and the surface shape parameters [2, 29-31].
Also, the electrical properties, including electrical conductivity, are greatly affected by the temperature of the environment.
Hegab, AC conductivity and dielectric properties of Sb2Te3 thin films, Vacuum 80 (2005) 284-294
Al-Solami, Heat-treatment effect on the structural and optical properties of flash evaporated Sb2Te3 thin films, Eur.

In this context, essentially important is an evaluation of concrete not only in relation to mechanical properties, but also determining the rate of its degradation by action of aggressive substances from the outside environment.
A significant problem is then redevelopment of such affected structures.
When taking a sample, contamination with the surrounding material occurs and this factor then makes identification of foreign particles and determination of their origin more difficult.
Portlandit is one of the minerals that significantly affect the binding power of set cement.
The above mentioned shows that the decrease in the mechanical properties of concrete exposed to extreme temperatures occurring by a fire is caused by the synergic action of both physical principles (i.e. destruction as a results of a “temperature shock”) and through physico-chemical processes occurring in the concrete microstructure (i.e. decomposition of concrete matrix, modification conversions in aggregate, etc.).

Through a detailed observation or analysis on the fracture surfaces of welds after the press-peel test, it was attempted to clarify dominant factors of the maximum load of the projection-welded joints.
Mechanical properties and chemical compositions of the steel used in this study.
This result reveals that the weld area is not the most dominant factor that affects the maximum load.
The electrode force was the most dominant factor that affects the maximum load of the joints. 2.
[3] Qu　Yan　and Katsuji　Nakashima, “Study　on Joint Properties　of l470MPa Grade　Die-quenched Steel Sheet and Weldnut”, Preprints of the National Meeting of JWS, No. 71, pp.452-453 (in Japanese)

Table1 Physical property parameters of zinc coated high strength steel Melting point (℃) Thermal conductivity (J·kg -1·K -1) heat exchange (W·m-1·K -1) Linear expansibility (10-6K -1) 1530 700 50 6~9 Main Parameters of Simulation Laser Equipment The simulation laser parameters is same as the experiment laser technical parameters, specifically as follows: rated power output is 1500W; beam mode TEM01; power instability is below 2%; beam divergence angle (half angle) is 1mrad; the output beam diameter before focusing is 26mm; diffraction limit factor M 2 is 1.26.
So along the welding direction the laser power is greater, the heat affected area is greater, the cooling rate is slower, it is disadvantageous to control the heat-affected zone grain growth.
As laser power increases, penetration depth will increase, the zone of molten material enlarge, the heat-affected zone is greater, the temperature of heat affected zone is much higher.
By the lower laser speed, the depth of the heat affected zone inner workpiece increases, the width remains unchanged.
Meanwhile the heat-affected temperature increasing range of the node also increases.

These factors influence the speed and uniformity of the filtration process.
This study provides a foundation for further exploration into the impact of the shape and geometric parameters of filter boxes on the protective and ergonomic properties of respirators [23].
However, structural factors still present considerable difficulties in analysis.
References [1] Cheberiachko, S., Knysh, I., Pustovoi, D., Sharovatova, O., Research of operational properties of household fabrics for production of protective masks.
DOI: https://doi.org/10.4028/p-c3LL1b [4] Tretiakova, L., Cheberyachko, Y., Kravchenko, B., Zolotarova, O., The influence of head strap elasticity on the protective properties of filtering facepiece respi-rators.

All these factors lead to the appearance of various defects on the surface of these components.
It has been established in practice that there is a close relation between the characteristics of component surface layers and their performance properties, including strength and service life.
However, if critical temperature is exceeded when machining a component, materials with no strain hardening gain advantage in strength, ductile and elastic properties.
This phenomenon can be explained by the fact that calculation software did not account for a temperature factor, which influences mechanical properties of materials in a complex manner.
Increase of heat buildup in the contact zone of tool surfaces and machined materials leads to mechanical property change in the contacting pair, for example, to decrease of hardness of the machined material.

Yao College of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200030, China Keywords: Indexable inserts, 3-D chip breaker, Model and design Abstract.
The quality of the breaking chip will affect both the machining quality and the efficiency in cutting metal for the numerical controlled machine (NC), the machining center (MC), the flexible manufacturing system (FMS), and many sorts of automatic machines and automatic product lines.
The properties of three kinds of carbide indexable turning inserts were discovered by cutting test.
According to this basic thinking, we can build the designing model equation for 3-D chip breaker: F=B+ S. (1) In equation, F: 3-D chip breaker; B: basic model; S: form factor.
Designing the form factor, and make sure of parameters of W� Wn, h, ro, � (Fig.5). 3.

Dielectric and photoluminescence properties of Mn-HAp samples are studied as a function of incubation period in SBF.
Many reports are available on dielectric properties of Ca-HAp material in pellet and thick film forms [15-16].
Therefore, electric especially dielectric properties of HAp are important to have better understanding of change in electrical properties of hydroxyapatite bio-ceramic material upon implantation in the biological environment.
These properties are called as cole-cole plots.
Chaudhuri, Dielectric and piezoelectric properties of hydroxyapatite-BaTiO3 composites, Appl.

The basic properties of the used photocatalyst is listed in Table 1.
Table 1: The basic properties of the used photocatalyst.
The PCO is also related to many other factors such as the photocatalyst surface area, the porosity of the substrate, surface roughness of the substrate etc.
(2) Both the physical properties (e.g. the porosity) of the gypsum plaster and the dosage of the photocatalyst affect the NO degradation efficiency.
Brouwers, Microstructure and mechanical properties of β-hemihydrate produced gypsum:An insight from its hydration proces.

Optimization of DVG850 Dual-screw Worktable System Based on ANSYS Workbench Jiang-miao Yi, Dong-qiang Gao, Fei Zhang, Huan Lin Institute of Mechanical & Electrical, Shaanxi University of Science & Technology Xi’an 710021, China Yijm0911@163.com 429089504@qq.com Keywords: worktable system, dual-screw transmission, ANSYS, modal analysis Abstract.
In traditional single-screw worktable system, the system is always subjected with torque because the driving force and force-bearing point of the workpiece always change with the processing path, so its performance may be affected.
So performance of machine may be affected.
When the finite element modeling of worktable system of the DVG850 high-speed vertical machining center is established, main load bearing parts are retained their original structure and shape and some non-load bearing parts are simplified based on reflecting their mechanical properties.
The comparison graph is shown in figure 2 The main factor to affect the dynamic characteristics of the worktable system is the low-order natural frequency of the worktable system.