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The natural aging behavior of the joint was systematically studied by local and global mechanical property testing method.
Based on TEM observation and EPMA analysis, the key factors that lead to different natural aging behavior among various regions of the joint were discussed.
Introduction The microstructure and properties of age-hardened Al-Zn-Mg aluminum alloy welds are in a metastable state after welding.
Therefore, in this work natural aging behavior of various regions (especially the weld zone) of the MIG-welded A7N01 aluminum alloy was systematically studied, with the aim of clarifying the key factors that affect the natural aging ability of the welds. 2.
The local tensile properties of the upper, middle and lower layer samples extracted along the welding direction from the weld zone were shown in Fig. 4.

Apply to all kinds of soil environment, especially suitable for the mechanical properties of coating resistance barrier properties, soil stress and high demanding environment.
Firstly, many factors such as capital and knowledge level, expensive anticorrosion coating application by certain restrictions, good comprehensive performance, low cost, easy to use, easy to promote the new material and new process will be popular, be badly in need of strengthening the research work in this area.
Conclusion Different anticorrosion properties of the coating application determines the requirements, the most basic performance test was conducted in the process of coating production, because of the short test cannot predict pipeline under various environment long-term use of all kinds of problems, and different types of coating thickness difference is bigger also, coating protection and failure is affected by many factors, and the test method and results of them, there are differences of historical experience is very valuable evidence materials, therefore, should be very seriously.

However, the geometry of natural valve is very complex and there are variety of parameters can affect performances of the valves.
Introduction Prosthetic valves could be categorized into two types including mechanical valves and bioprosthetic valves with their own advantages and disadvantages.
The parameter C selected as 51.6 [3] represents a constant that is based on the discharge coefficient used for the aortic or mitral valve, and the unit conversion factors to result in the computed area in terms of square centimeter.
For the same material properties, the higher thickness often resulted in higher stiffness to the leaflet which produced a bigger resistance to the movement of the leaflet.
Column#/Factor Level Description 1 Height(mm) 17.5 2 Angle(degree) 0 3 Thickness(mm) 0.3 This study investigated biomechanics of three PU valve models using ABAQUS.

algorithm is the key of finite element analysis, affecting the increment calculation step, and the convergence or accuracy of the results, so finite element method has been used in the early integration algorithm[3].
The resulting mutant vector can be expressed as follows: (1) F is the scaling factor and is generally chosen between 0 and 1.
Thus, the stability of surrounding rock mass depends upon its strength and deformation properties as well as the situation of stress convergence.
Fig.2 The shear stress Fig.3 The maximum stress Fig. 4 The minimum stress Local failure of tunnel is generated with the deterioration of physical and mechanical properties of rock, and it may cause the entire tunnel collapse.

The surface morphology, thickness, composition, state of the constituent elements and optical properties of the films were studied with X-ray diffraction (XRD), scanning electron microscopy (SEM), step height measurement instrument, X-ray photoelectron spectroscopy (XPS) and spectrophotometer, respectively.
The affect of annealing for the Cd1-xZnxS thin films was studied.
However, the chemical reaction in CBD was sensitive to many factors with interacting each other, such as kind and consumption of reactant, ratio of reagents, reaction temperature, reaction time, pH value of the reaction solution and stirring rate, and so on.
The morphology, structure, composition and optical properties of Cd1-xZnxS thin films were investigated.
All the solid reactants were dissolved in de-ionized water in advance and mixed with mechanical agitation at medium speed for 8 to 10 minutes in the 1000 mL beaker.

The performance of bearing has great influence on mechanical components and fatigue is one of the most important failure modes.
The process of fatigue damage usually accompanies with the initiation and propagation of fatigue cracks, and the crack extension further affects the damage degree and fatigue life of mechanical components.
While Deng has studied the propagation rules of surface crack and the influence factors using FE method [3].
So the extension of the crack can be quantitatively described by stress intensity factor (SIF).
The material is 20CrNi2Mo with the properties of Young’s modulus E=210GPa and Poison’s ratio 0.3.

Temperature, oxygen level and the presence of nutrients are the main factors influencing the rate of biodegradation.
A lack of oxygen is usually the limiting factor for in-situ bioremediation.
A dark-brown oil slick covered at least 183 km2 of ocean near the damaged Xingang port, with 50 km2 severely affected.
The effective treatment of oil spills can minimize the loss of marine ecology, human lives and property.
Together, these factors usually mean that only a small fraction of a major spill can be dealt with at sea, and it is almost inevitable that oil will threaten coastal resources.

There are various treatments used to improve fatigue properties: thermal, chemical and mechanical methods, all have applications in this area.
Improved mechanical strength and fatigue properties are desirable in all engineering components, allowing lighter, more efficient operation in these circumstances.
This process alters the microstructure and properties of the peened layer, and therefore, fatigue damage needs to be assessed in terms of microstructural fracture mechanics [6].
The chemical composition and mechanical properties of the alloy are depicted in table 1.
Materials: Mechanical properties and chemical composition [13].

The design of fiber art can not be separated from the material, the material is an important factor and the material basis for fiber art, which is the central,the soul of designing the fiber art ,the use of materials directly affected the fiber art works.
Therefore, ramie fiber material is a life marked by specific emotional factors, closely related with the creative ideas, becoming the accurate expression of emotion.
Sensory properties of the ramie fiber material.
People get to know the world through the senses to feel, practical experience is a basic element for aesthetic feeling,which can cause some physical pleasure about the specific things, so as to better understand the world.Sensory fiber materials refers to the aesthetic characteristics of the most basic material shown to the people, the physical properties of which is the material itself bringing to the audience's aesthetic experience.
This tends to be more focused on the natural beauty and authentic aesthetic psychology, in modern fiber art, which has attracted more and more attention and recognition from people, many works are cleverly processed, truly reflected the natural beauty of material, showing a kind of nature, which will bring people's aesthetic experience because of properties of the ramie fiber material.

Workers in nanotechnology may be exposed to new properties of materials and products that have health effects which are not yet fully explored [2, 3].
The approach includes certain additional steps and is part of a comprehensive approach, which has as main objective the control of risk factors [10].
It was clearly highlighted that only measuring the concentration of mass is insufficient to characterize nanoparticles, due to the inability of this parameter to allow forecasting the risks of affecting the health of workers.
In this scenario, if one of the factors considered to have a potentially high risk, work should be carried out in the control level 4.
Huber, Synthesis, properties, and applications of iron nanoparticles, Small, 1, , 482-501, (2005) [4] L.I.