Search results

Principal chemical composition and distribution of hybrids particles are important factors controlling the properties behavior.
The addition of reinforcements with proper selection phases in metals matrix alters and improves their mechanical and physical properties.
It has been found that alumina reinforcement improves the mechanical and physcial properties of the composites [1-4, 9-11].
GU, Mechanical Properties and Damping Capacityy of (SiCp+ Al2O3.Sio2f/Mg Hybrids Metal Matrrix Composites, Journal of Alloys and Compounds, Vol. 383, (2004), P. 104
Ray, Effect of porosity and Alumina Content on the Mechanical Properties of Compocast Aluminium Alloy-Alumina Particulate Composite.

According to the material properties and operational research theory, the mathematical model of the optimal selection material of water lubricated rubber bearing is established.
The influence of material properties on the objective function is discussed..
The urgent need to carry out the research of the system including the development of the material, the mechanism of the vibration and sound mechanism and the influencing factors, and the measures of reducing vibration and noise[9].
By changing the proportion of each component, a series of composite rubber material with similar properties can be obtained[6].
The mechanical properties of water lubricated plastic alloy bearing material modified [J]. lubrication and sealing.2004 (6):80-82

But the defects in ZnO crystal are the key factors for restricting the luminescence properties of the material.
After annealing treatment the optical properties of ZnO thin films were characterized by photoluminescence (PL) with a laser using an excitation wavelength of 351 nm and a 100 mw power.
Summary At present, the research of ZnO is a hot spot, it is expected to be ultraviolet and visible light emission materials at room temperature or higher temperature because of high chemical and mechanical stability and excellent photoelectric properties, substituting for the current industrialized GaN material.
But there are always some defects in materials due to the influence of substrate and the growth condition in preparing process, which affected the properties of ZnO materials seriously.
Brown, ZnO Properties and Applications, International Lead Zinc Research Organization, New York, 1976

The barrier design is while manifests the design skill using the design science and art, is affecting humanity's daily life style as the modern product design's new form, Its advocate and the development will certainly to bring the positive influence to the human culture advancement.
At present in the world many designers have designed special activities and in all kinds of design in the design factors as design objects into account.
Some design is designed for all kinds of action inconvenience, some are in the senior high school entrance examination generally considered design factors.
Such as to reduce or increase the load, to maintain the stability of objects or reduce, reduce or increase the contact area, increase or decrease the friction coefficient, the ingenious force play a necessary physical strength, reduce or increase the physiological and psychological tension, dynamic factors into mutual conversion, static factors using the incline, increasing the rotation torque, reduce the impact force, enhance the import of morphology, enhance color, symbol of the visual impact, simplified or increase the operation procedure, increase or decrease the ladder, enhance safety consciousness.
Design barriers design of products over the next few years will be in the functional, easy to use, easy processing properties, emphasizes the profound expression of other innovation and deep cultural connotation.

Good agreement of stress intensity factor along crack length was obtained between numerical and experimental results.
There are some parameters that can affect SD fatigue life: SD diameter, position and surface finish of the SD, crack length, geometry and mechanical properties of the component, load history, type and magnitude, and residual stresses around the SD.
Several authors have been studying SD technique in an attempt to understand how certain parameters can affect stop-drill fatigue life.
Acording to Branco [10], stress intensity factor range (∆K) can be calculated using expression ∆K = Y ∆σ√πa, were a is the crack length, b is the specimen width and Y is the geometric factor.
• Computational results showed a small number of cycles supported by SD due to its strong dependence on Morrow relation parameters and aluminium mechanical properties, which were obtained from literature.Figura 1: Specimen geometry.

Introduction Titanium alloy has been widely applied in aeronautics & astronautics, boat & ship manufacture, and petrochemical industries due to its distinctive mechanical properties.
Experiment and Analysis on the Near-dry Deep-hole Drilling of Titanium Alloy The cutting tool life and the cutting force are the major factors affecting the machining accuracy and efficiency of titanium alloy, while the material, structure and geometry parameters of the cutting tool play the decisive roles in tool life and the cutting force.
Considering the major factors, we make an experiment plan as follows: (1) Select several kinds of cutter materials such as YG8, YW1, YD15, YT726, and YT798 etc. to drill the deep holes with same dimension and depth in titanium alloy.
From Table 2, we can see that the cutter with material YG8 has the best machining properties, the wear rates of which is lowest, the torque and axial force are smallest, and the surface finish of the hole drilled is best.
This is related to the properties of the material YG8.

Data mining is a new emerging subject which affecting area very broad and overlap, it involves database, artificial intelligence, mathematical statistic, visualization, parallel computing and other area.
Because the data inclined to be affected by data noise and inconformity or other factors, before we use the manner of data mining, the data always need to be treated first, in order to reduce the dimensions of the original data, and improve the quality of the data and the speed of mining.
Association Rules Association rules is a kind of simple, practical analysis rule, it describes the regulations and mode when some properties of one thing appear simultaneously, it is one of the most mature technique.
The students academic besides have connection with their intelligence, there also have many other factors, the most importantly of them is learning methods.
Data Mining Concepts and Techniques [M].Beijing: Mechanical Industry Press,2007,3:3-6

Mechanisms of structure transformations, as well as hardness changes in the nugget and thermo-mechanically affected zones are discussed.
However, the nature of FSW joints property enhancement, caused by specific structurization of the welding materials in the nugget and thermo-mechanically affected zones (NZ and TMAZ), is not still so clear despite an activities in many laboratories around the world.
Taking into account also two facts, that the refinement of brittle particles of excess phases by mechanical failure is quite typical for severe plastic deformation [4,7,8] and the same relation between mean grain sizes of the alloys found in the initial and processed conditions, the NZ microstructure could be specified as follows: the light rings, containing larger grains and particles of higher density, should be formed preferably by the cast alloy, and, оn the opposite, - the wrought alloy predominantly has originated more dark rings.
At that the initial alloy structural condition has noticeable impact both on width of thermomechanically affected zone, and on the grain size in a nugget zone: the more extended zone at the smaller size of grains is formed from the wrought alloy side.
For effective FSW of such materials the understanding of evolution of their structure vs welding parameters comes to the forefront, being a supervised factor to receiving required structure and mechanical properties of joints.

The results of SFC tests show that the treated carbon fibers composites could possess excellent interfacial properties with mixed resins.
The mechanical properties of carbon fibers reinforced polymer composites are mainly controlled by the interfacial properties between the fiber and matrix even though they are also affected by the original nature of the fiber and matrix resin.
Plasma treatment modifies the uppermost atomic layer of the material surface without affecting its bulk characteristics.
The effect of plasma treatment on IFSS is researched that has two main factors.
[2] Jingqiang Hou, Xiaodong Zhou and Xinggui Zhou, Grafting of Poly(n-butylacrylate) -b-poly(2-hydroxyethyl methacrylate) on Carbon Fiber and its Effect on Composite Properties, Polymer-Plastics Technology and Engineering. 50:3, 260 – 265 [3] Ma, K., et al., Plasma treatment of carbon fibers: non-equilibrium dynamic adsorption and its effect on the mechanical properties of RTM fabricated composites.

The purpose is to study the synergetic effects of such parameters on the contact stress non-uniformity (NU), which directly affects the spatial non-uniformity of the material removal rate on the wafer surface.
One of the most important factors causing NU is the phenomenon of stress concentration on the wafer edge.
Meanwhile, for a multi-zone wafer-back pressure profile to affect the contact stress distribution on the wafer surface, the wafer deformation has to be taken into account.
The mechanical and surface properties of the pad and wafer are listed in Table 1.
Note also that, as the retaining ring is assumed to be rigid in the present model, its mechanical properties are immaterial.