Search results

The mixing of rubber powder will change properties of CS [9].
Three specimens were tested for each property.
When rubber content was 10%, the mass loss factor was least.
After that content, loss factor was significantly increased.
Fig.4 (b) is contrast curve in the conditions of concentration 20%. d = 550μm RCS still maintains good mechanical property after SCFT cycles in the high concentration corrosion solution.

Flow Analysis on Hydrostatic Guideway of Precision CNC Lathe Based on FLUENT Li Song1, a, Song Jinchun2, b, Han Mingli3, c and Ren Yujie4, d 1, 2, 3, 4 School of Mechanical Engineering & Automation, Northeastern University, China alisongsnow@163.com, bjchsong@mail.neu.edu.cn, cminglihan1986@126.com, dyltryj@163.com Keywords: precision CNC lathe; hydrostatic guideway; FLUENT; flow field Abstract: In order to improve the machining accuracy of precision CNC lathe, and explore the fluid motion law in the closed hydrostatic guideway, three-dimensional model of hydrostatic oil chamber was established using preprocessor GAMBIT of FLUENT.
Introduction In the past decades, with precision machining technology widely applied in aviation, aerospace, mould making, etc., the machining efficiency and machining accuracy requirements of precision machine are highly increasing.[1] The guideway accuracy is one of the most important factors which affect the machining accuracy.
And pressure under-relaxation factor was set 0.3.
The three-dimensional image shows the pressure distribution is not homogeneous, which makes the real properties of hydrostatic guideway can be deeply recognized.

Corrosive media affects the initiation and growth of fatigue cracks[1,2].
The basic mechanical property of the material is listed in Table 1(Details in Ref. [5]).
Table 1 mechanical properties of 30CrMnSiNi2A Elastic modulus (MPa) Possion ratio Yielding stress(MPa) Ultimate stress(MPa) 200000 0.33 1189 1580 The corrosive environment components are following
The interface of the mixed liquor is just located on the crack surface of the test sample so that the cracking surface can be affected together by the two different corrosive liquors.
Table 4 Critical crack sizes under different corrosive environments Corrosive environment Critical crack size(mm) Lab air 19.8 Moist air 20.2 3.5%NaCl 20.2 Oil-box zone 20.4 Dried air 20.1 Tank seeper 19.4 Cookroom&washroom 20.5 High altitude 19.4 Conclusions (1) The corrosive media could accelerate crack growth rate of steel 30CrMnSiNi2A in different degrees, which shows that environment factors are indispensable to damage tolerance design of aircraft and must be considered in crack growth analysis

As the longitudinal tensile reinforcement strain influences the shear strength of RC beam, the shear resistance of the beam under sustained load may also be affected by the amount of longitudinal reinforcement.
The shear resistance of RC beams without shear reinforcements is affected by several factors among others, shear span-to-depth ratio, material properties, axial forces, size of the beam, longitudinal reinforcement ratio, and types of loading.
Because shear crack formation is indirectly affected by the tensile reinforcement configuration, the shear strength of the beam under sustained load may also depend on the reinforcement configuration.
Sagaseta, Shear Strength of Concrete Members without Transverse Reinforcement: A Mechanical Approach to Consistently Account for Size and Strain Effects, Eng.
Sagaseta, Shear Strength of Concrete Members without Transverse Reinforcement: A Mechanical Approach to Consistently Account for Size and Strain Effects, Eng.

The results indicated that when the ratio of 3-methoxypropionitrile to sulfolane achieves 3:2, the cell showed the optimal photoelectric properties and stability, and the short-circuit current and photoelectric conversion efficiency achieved 7.58mA/cm2 and 2.79%, respectively.
The effects of sulfolane on potoelectric properties and stability of DSSCs were studied.
Another reason could be the reduced electrolyte conductivity, which increased the internal resistance of DSSC, thus reduced the fill factor and the photoelectric conversion efficiency.
The increased of the fill factor was induced by the sulfolane with the TiO2 film formed a stable transfer channel for electrons and reduced the internal resistance of the cell.
The measurement of DSSCs indicated that when the ratio of 3-methoxypropionitrile to sulfolane as mixture solvent for electrolyte is 3:2, the cell has the optimal photoelectric properties, the short-circuit current of 7.58mA/cm2 and the photoelectric conversion efficiency of 2.79% were achieved.

Modern physics distinguishes three fundamental properties of atomic nuclei: mass; spin and related magnetic moment; volume (surrounding field strength), which are the source of isotope effects.
The elementary particles have intrinsic properties.
Some of these properties such mass and charge are the same for macroscopic objects.
Some are purely quantum mechanical and have no macroscopic analog [1].
Kosyakov, On inert properties in classical theory, Phys.

However, the electrical performance parameters common photovoltaic module testing and detection is different, which is determined by the following features special optical components: 1, poor working environment, working temperature range to many special optical components vary widely, and some at work To withstand high overload and various environmental stress, but sometimes not considered in the detection of more than external factors, often artificially placed in the ideal environment to detect the state; 2, part-time work product is often over in its design and production process more consideration to its function implementation issues, and less consider storage reliability and testing reliability issues. 3, system structures are often intricate, large detection is difficult. 　　
Modern high-tech products composed of complex, both mechanical parts, there are optical parts.
Should be noted that the detection performance of the optical system is referred to herein does not include detection of mechanical parts of the system.
Analysis focused on the second and then speculate what happened from a product perspective, consider the following two reasons for this phenomenon:1, in the life of the product, with the gradual prolonged storage time, the performance of its internal electronic components gradually changed, resulting in performance parameter drift, causing the test are not allowed [2]. 2, under a single test environment and do not represent the whole environment under test, the electrical properties of electronic components inside the product parameter drift in different environments, leading to its response signal does not meet the standard. 　　
Impact on the capacitor is to capacitance and dielectric loss angle (power factor) and other parameters change, causing the circuit RC time constants and other parameters change [7].

Compared with the traditional mechanical gyroscope, fiber optic gyroscope has the advantages of high reliability, small volume, high tolerance for shock and vibration, wide bandwidth, good linearity and low cost, which makes it evolve from a pioneering physics experiment to a practical device rapidly since it has been demonstrated in 1976 [1].
A FOG is composed of fiber optical sensors and electric circuits, both of which can affect the performance of FOG (such as bias, scale factor, random drift, dynamic range, etc.).
The preamplifier should satisfy the properties of low noise, high gain and wide bandwidth.
Fig.5 Output signal of FOG To test the dynamic range and the nonlinearity of scale factor, the corresponding experiment is conducted in the turntable.
The output result shows that the nonlinearity of scale factor is less than 100 ppm in a broad dynamic range.

TiO2 is one of the semiconductors that meets the criteria as a photoanode material in DSSC because it has good optical and electronic properties [8].
Nanofiber structures have attracted attention in research because of their high surface area, porous structure with good physical and mechanical properties [9,10].
The morphology and diameter of the resulting nanofibers depend on polymer properties and process parameters, including polymer molecular weight, solvent, applied voltage, solution viscosity, needle diameter, and needle tip distance to collector [11,12].
The characteristics of TiO2 nanofibers produced in this experiment were tested using a Scanning Electron Microscope (SEM) to determine the morphology, X-Ray Diffraction (XRD) to determine the phase and crystal structure, and UV-Vis spectroscopy to obtain optical properties of the sample.
This is because the applied voltage can affect several factors such as the mass of polymer coming out of the needle tip, the degree of elongation of the beam by electric force, the morphology of the beam (single or multiple jets), etc [15].

There are lots of factors affecting the dispersion stability of nanofluids[9-12].
The results showed that for the nanoparticles with different property, there were big differences of the dispersion stability under the action of different surfactants.
The effect of pH value The pH value is also an important factor affecting the dispersion stability of nanofluids.
Conclusions The main factors affecting the dispersion stability of water-based nanofluids prepared by using the supersonic dispersion method are involved in the types and the dosage of the dispersants, ultrasonic power, ultrasonic time, the size of the nanoparticles, pH value, etc.
[10] PENG Xiao-fei,YU Xiao-li,XIA Li-feng, “Influence factors on suspension stability of nanofluids,” Journal of Zhejiang University(Engineering Science), 2007, 41（4）: 577-580