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However, due to its limitations in mechanical stability, composition reinforcement is always required for practical applications [4-6].
Since the alternation of membrane breathability are based on the change of pore diameters with the environmental temperature, the membranes pore structure is an important factor for the temperature sensitivity of the membranes.
More over, in the immersion precipitation phase inversion method, various factors, including the material properties, the solvent/none-solvent system and the coagulation conditions, can influence the phase inversion procedure, and consequently determines the morphology of the membranes [7-9].
Considering this, with the help of SEM and FTIR, we focused our discussions on the influence of membrane morphology by the factors of semi-IPN compositions, coagulation temperature and content of the coagulation solutions in this paper.
More over, the morphology of the membranes is affected by various factors of the material properties and membrane preparation [12].

Introduction As the representative static seals, elastomeric gaskets and O-rings have been widely used in various mechanical systems to prevent operating fluid leakage which includes lubricating oils and coolants.
However, a large amount of leakage was reported in industrial fields because of careless handling of the gaskets during assembly and the corrosion of counterparts among other factors.
(a) Normally assembled gasket (b) Gasket tilted during assembly Fig. 2 Comparison of Assembly Process Table 1 Basic properties and design factors of rubber material Rubber EPDM Design Factor Elongation (%) 275 Compression Ratio Single point 23.3 % Tensile Strength (MPa) 16.5 Double point 23.8 % Hardness (Sh A) 70 Filling Ratio Single point 80.5 % Compression Set (%) (150℃ X 70 hr) 14 Double point 84.4 % Gasket Material and Analytical Conditions.
The basic properties of the rubber material and design factors for the two types of gaskets are shown in Table 1.
The equivalent Cauchy stress and total strain of the double-point contact gasket was slightly higher than that of the single-point contact gasket, but it was not expected that these differences could affect the sealing performance of the gaskets. 3.0 MPa 3.3 MPa (a) Equivalent Cauchy stress distribution 25% 24% (b) Total strain distribution Fig. 3 Stress and strain distributions after normal assembly It was thought that the reason for a higher stress and strain in the double-point contact gasket was from the filling ratio, not from the compression ratio.

Introduction Non-dispersible underwater concrete is described as tremie concrete, and is a new type concrete which can be poured underwater and whose aggregate and cement slurry separate in water is not like normal concrete. [1] In recent years, the construction of underwater projects is developing prosperously, concrete is still one of the most important and largest demand building materials in underwater engineering and the performance of underwater concrete will directly affect the quality of underwater engineering.
Because of the differences of mechanical property between non-dispersible underwater concrete and normalconcrete, it’s necessary to study the mechanical performance of columns.
The paper will use the experiment analysis way which study the mechanical performance of nomal concrete columns, discuss the mechanical performance features of non-dispersible underwater concrete columns with the experiment of axial compression and eccentric compression and provide a reference for researching non-dispersible underwater concrete.
Finally, taking all factors as a whole, we select secondary anti-washout admixture (UWB-II) which is manufactured by Engineering and Technology Institute of China National Petroleum in 2003.
Table 2: Mechanical property of concrete and longitudinal reinforcement Concrete Longitudinal reinforcement Material fcu(MPa) Ec(GPa) fy(MPa) fu(MPa) Es(GPa) NC 41 28 405 530 200 NDC 33 24 Specimens To better compare with normal concrete, the paper designs 3 groups, 6 concrete short columns (slenderness ratio is 4.5) on the basic of eccentric distance.

Fig. 1 shows schematic of tensile-shear test specimen and Tables 1 and 2 show the chemical composition, and the mechanical properties and surface condition of GA45 steel plate respectively [2].
Evaluation of Mechanical Properties General tensile test was conducted for mechanical properties evaluation about spot welding specimens.
Nugget diameters of specimens were measured as the main factor to evaluate welding quality.
Mechanical properties and surface conditions of GA45 steel plate Tensile strength (MPa) Yield strength (MPa) Elongation (%) Thickness (mm) Coating wt.
HAZ (heat affected zone) is expanded by the increase of electric weld current, and the area where spatter generates increases.

It makes it possible to adjust the process of liquid weld pool crystallization, forecast the structure and properties, and improve operational and mechanical properties of joint welds.
It influences considerably the process of welding, structure and mechanical properties of the deposited layer.
This additive makes it possible to produce a hard-alloyed coating with improved mechanical properties.
Lee, Effect of Al and Mn Content on the Mechanical Properties of Various ECAE Processed Mg-Li-Zn Alloys, Mater.
Tang, Effect of nano oxide on microstructure and mechanical properties of low alloy high strength steel welds, Trans.

Introduction Since the introduction of stone machining tools based on metallic bonded diamond grains, a close adaption of the cutting segment specification to the properties of the stone material is necessary.
This includes the configuration of the diamond concentration and size distribution but also the properties of the metallic bonding.
A mechanical dressing process is only used after the tool manufacturing in order to avoid mechanical and thermal damage due to insufficient grain protrusion.
Here, already minor deviations from the ideal parameter set or variations of the workpiece properties can cause severe tool damage.
Further research is done to identify parameter combinations affecting the segment topography fast and effectively.

Another example of a reversal load sequence is compression testing along the extrusion direction (ED) of ECAE samples, a common test to probe their mechanical properties.
Material and microstructural properties, such as SFE and presence of second phase particles, need to be taken into account.
As will be described shortly, ατB∆ , ατR∆ , and ατL∆ depend on many factors.
Other factors.
There are some factors that have not been addressed in the present examples.

However, to date, very few studies have been completed to find the unified theoretical and theoretical-experimental equations that allow us to determine the optimal cutting conditions for the processed and tool materials with wide variations in their physical and mechanical properties.
Among the factors affecting the wear of the cutting edges, the cutting temperature plays the most important role.
Under small cutting speeds (in the area of build-up) В < 0.4 and it means that the algorithm contains a mistake which affects the results of cutting temperature calculations.

It is a well known fact that the two-phase zone width, i.e. the temperature interval containing both molten metal and crystallized dendritic network, affects the feed of the billet, the development of segregation heterogeneity and hot cracks [6, 7].
The temperature range of solidification is conditioned by a number of factors, steel chemical composition being the major one.
It deteriorates heat removal, negatively affects crust thickness and billet macrostructure in general thus making the central zone less sound.
It allows to increase concast billet strength properties and avoid a number of defects which decrease product quality.
Li Mold Thermo-Mechanical Rigidity Criterion for Surface Quality of Continuous Casting of Steel.

Crosslink density is very crucial for good elastic properties of natural rubber product.
The degree of crosslink of raw natural rubber can be influenced by lots of factors.
Double network structure can be easily affected by the procedure of processing, especially the wet natural rubber drying.
When the wet natural rubber was dried under an appropriate drying time and drying temperature, drying rate and so on, the dry rubber was showed a relative excellent comprehensive properties, for example, good strength, ageing resistance, wear resistance, and so on.
However, the actual network structures were far from the ideal state and their mechanical properties were difficult to explain only by the crosslink density and entanglements.