Search results

Therefore, the materials used for wheels are required to have high strength, high hardness and good wear resistance, and have the combination of high toughness, good heat resistance and other properties[4].
In the actual situation, many factors can affect the wheel-rail frictional wear, so it is difficult to perform reliable quantitative calculation for the wheel-rail wear under various working conditions.
Therefore, the instantaneous flash temperature with a very high temperature would be caused and the physical and chemical properties of materials would be affected.
With the impact of various factors, the wheels produced normal load on the rail inevitably, so the bending moment had an impact on the initiation and expansion of fatigue cracks[7].
Perssonb: Investigation of factors influencing wheel–rail adhesion using a mini-traction machine.Wear.

The displacements of buildings near foundation pit are affected by many factors, such as the excavation speed and anchor.
The natural foundation bearing capacities of each soil layer and representative values of main properties in physical and mechanical are shown in table 1.
Table 1 Physico-mechanical parameters Geotechnical layer State Characteristic value of foundation bearing capacity [fak/kPa] Modulus of elasticity [Es/MPa] Internal friction Angle [Ф/°] Cohesion [C/kPa] Plain fill Losse-slightly dense 80 4.3 6.5 10.0 Silty clay Hard plastic 220 7.0 17.0 22.0 Silty clay Hard plastic 230 7.1 17.0 22.5 Silty clay Waxiness-soft plastic 120 4.8 10.0 16.0 Gravel with clay Moderate density 420 20.0 30.0 ∕ Limestone Slightly weathered 5000 The hydrogeological conditions of site are in moderate.
By observing horizontal displacements and settlements, it can effectively monitor the states of supporting structures and find abnormal phenomena in time. 2) During excavation, the maximum deformations appeared in middle part of sides and at corners of foundation pit. 3) There are many factors influenced settlements of buildings, such as distances from pit boundaries, arrangements of supporting piles, time effects and so on.

The molecular design of conventional additives mainly focuses on the purpose of meeting the operational performance of lubricants and considers a little about factors like environmental protection and ecological conservation and less about the toxicity and biodegradability of lubricants.
For environment friendly lubricant additives, low toxicity, excellent biodegradability and great functions are the main factors considered.The adding of additives will generate a certain impact on the biodegradability of base oil.
Particularly, it will have a harmful effect on the active microorganisms or enzymes in the process of decomposition of base oil, thus affecting the biodegradation rate of base oil.
Effect of nano grade copper powder on wear and friction properties of lubricant[ J ].
Improving antiwear properties of lubrication oil with nano copper powder[ J ].

The principle of ground well arrangement Because of the existence of various factors, the ground CBM development has been overshadowed.
Of course, there need certain surface and geologic condition for ground well, so the topographic and geologic factors must be considered.
Discussion The above only discussed the basic principle and key factors for surface CBM well net design, but its feasibility need to be proved by field practice.
Study on Control Factors of Rock Mechanics Properties of Coal-Bearing Formation.
Research on Mechanical Property Test and Mechanism of Hydraulic Fracture of Gas Well in Coalbed.

Cao, Modifying the properties of steel slag by iron tailings at high temperature (in Chinese), J.
The physic-mechanical properties such as linear shrinkage, water absorption and flexural strength were measured for the fired samples.
Sintering properties.
Water absorption is an important factor affecting the mechanical properties of ceramics.
With the temperature increasing, the quartz gradually decreased and finally the dominant crystalline phase diopside with columnar crystals in 2-5μm at length was obtained, which contributed to excellent mechanical properties.

The mechanical properties of composite materials are modified by traditional coupling agent often can not meet the requirements [5-6].
After mixing and crushing, the samples which were used for mechanical properties test were prepared by huck trace injection molding machine.
After mixing and crushing, the samples used for mechanical properties test were prepared by huck trace injection molding machine.
Two factors important to that are as follows.
And flexible polyacrylate segments are beneficial to stress dispersion, so as to improve the mechanical properties of composite materials.

The temperature at the junction of an electronic package (chip temperature) has become the limiting factor that determines the lifetime of the package.
A particular type of two dimensional separation flow that is associated with plane flow past a surface-mounted rib with constant properties had been conducted by Hsieh and Huang (1987).
Factors affecting the chip temperature such as coolant velocity, chip power and thermal conductivity of materials are studied and presented. 2.0 The Numerical Model 2.1 Governing Equations The basic equations describing the flow of fluid are conservation of mass, conservation of momentum and conservation of energy.
Outflow Inlet air velocity a) Isometric View 10 cm 9 cm 7 cm Thermal Pad Motherboard (PCB) b) Side view Figure 1: Simulation Setup for 4 PLCC Packages Table 1: Dimension of Components Used in Simulation Component Quantity Size (cm3) Wind tunnel 1 52.5 cm × 10 cm × 10 cm Motherboard 1 33.3 cm × 0.15 cm × 8 cm Thermal pad 4 2 cm × 0.1 cm × 2 cm Chip 4 2 cm × 0.3 cm × 2 cm A combined model is used for packages and the properties of the packages are uniform.
It is tolerable as slight difference in shape may not affect the simulation result. 3.0 Results and Discussion The results are presented in terms of junction temperature and thermal resistance for the packages under different operating conditions.

The methodology, PRO3 TM, incorporates product properties, production- and material costs as well as CO2 footprint in an optimisation procedure.
Consequently, high levels of PCS may affect both the thermomechanical treatment along the value chain and the properties of the product.
The present article demonstrates that the optimum profile design for a given product can be influenced by the amount of PCS used, as the mechanical properties may vary due to the larger chemical composition window.
This term will vary between different sites depending on factors such as the fixed costs and costs of labour and energy. vram and vramref are the extrusion ram speed for the comparative case and for a reference case, respectively.
Myhr, "Method for the Optimization of Product Properties and Production Cost of Industrial Process," (2014)

When examining the results obtained with empirical and model research, it has been shown that in the structural design of carbon fiber drive shafts, the main factor affecting the right development of the structure should be dynamic criterion, since the only use of static criteria leads to big errors.
The basic rheological properties are: elasticity, viscosity, plasticity.
Maxwell and Kelvin-Voigt models constitute the basic models of viscoelastic body and characterise its properties in a simplified and idealised way.
The most often it is assumed that elasticity is a non-linear function of deformation, while viscous properties depend on the deformation speed.
[11] Folęga P., The study of the dynamic properties of some structural components of harmonic drive, Journal of Vibroengineering, 15(4) (2013) 2096-2102

Because of these properties, the most attractive applications of SiC-based devices can be used as the most attractive application area of high power, high frequency, high radiation, and high-temperature circumstances [3, 4].
However, promising properties of p-type SiC, which can be used for the fabrication of highly efficient power devices depending on the quality of the SiC layers and metal–SiC contacts, and have not accomplished yet their in full potential today.
Experimentally all rectifying properties of six (DWS# 2, 5, 6, 7, 8, 9) Al/4H-SiC SBDs are measured by Keithley 2400 source and measurement unit with LabVIEW program.
The observed changes in the (ΦB0) and (ND) are related to the interface layer formed by a thin oxide layer as a lattice defect affecting the interface region existing around the contact area near the Al film/p-4H-SiC.
Andreev, Electrical characteristics and structural properties of ohmic contacts to p-type 4H-SiC epitaxial layers, semiconductors volume 33 (1999)