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Further, Ergonomic factors have also been studied.
The aesthetic aspect has the same percentage as the roominess and mobility with 2.2% each.[3] These are required properties for analyzing seating comfortness [8] o Head rest mass, seat back mass and mass of seat cushion.
o Moments of inertia of seat cushion, head rest and seat back o Location of the centre of gravity of the head rest, seat cushion and seat Back o The lumped frame-foam-stiffness (loading and unloading) of the different parts in the seat back, seat cushion and head restraint o The damping properties of the lumped frame and foam o The joint properties (loading and unloading) Friction coefficient of the seat back and seat cushion SEATING DISCOMFORT Feelings of discomfort are mainly associated with pain, tiredness, numbness and soreness.
These feelings are considered to be imposed by physical constraints and mediated by physical factors like joint angles, tissue pressure and circulation blockage.
Conclusion An overall seat discomfort is influenced by both static and dynamic seat factors.

Especially, concrete cracking affects the durability and service life of bridges.
The mechanical behavior of the composite structure was not only determined by the properties of different materials, but also influenced by the connection structure between different materials.
And comprehensive influencing factors such as shear capacity, construction, durability, maintenance and economic performance should be considered when the connector was chosen.
These authors concluded that the structural response was influenced by several geometrical properties such as the number of holes, the plate height, length and thickness, the concrete compressive strength, and the percentage of transverse reinforcement provided in the concrete slab.
This is presumably because the rigidity of the PBL connector affects the rigidity of the entire girder when cracking has progressed to a certain degree.

There are two vital factors contributed to this phenomenon.
This phenomenon does not derive from discharge energy, but due to the thermal and mechanical properties of specimens.
The alteration of thermal and mechanical properties in deposition will deteriorate their plasticity and tenacity as the prolonging of deposition time.
And when protecting gas flow is too small to form good protection, it may cause oxidation, thereby affecting the deposition thickness and quality.
Eng., Univ. of Tokyo, 25/1: 12-16 [4] Lesnjak, A., Tusek, J., 2002, Processes and Properties of Deposits in Electrospark Deposition, Science and Technology of Welding and Joining, 7/6: 391-396 [5] Li, Y.

The composite properties differ depending on the combinations of the two components, the matrix type, type and shape of the reinforcement, the processing method applied, among others.
The injection pressure and temperature gradient are the main factors [2], so their optimizations are desirable for a correct filling of the mold and increase productivity.
The main advantages of RTM include non-expensive process equipment, excellent control on mechanical properties, closed mold process, the possibility of producing large and complex parts with low labor costs, use of different weave and mat fabrics architectures, as well as not requiring the use of prepregs [3], high fiber volume content, use of various types of resins, low injection pressure, good dimensional tolerances, relatively low equipment cost, short production cycle times, process automation and low solvent emission.
In many cases, the resin is injected together with solid particles, such as calcium carbonate, in an attempt to improve the mechanical properties of the composite and optimize the process [5].Therefore, the objective of this study is to verify the effect of calcium carbonate mixed in resin in the RTM process.
It can be noted that with 10% CaCO3 content in the resin, it flows more easily than 40% CaCO3, thus affecting the filling time.

The mechanical properties of different type of all-ceramic crown are evident different because of the differences of materials and production process.
However, due to the brittle performance of ceramics, porcelain fracture and spalling fracture were often occurred and the use of all-ceramic restorations was greatly affected.
Meanwhile, the metal ions of the ceramic alloy not only make the porcelain prosthesis occurred fade, and some patients have metal allergies [3], the existence of these factors impels the development of the all-ceramic systems without metal basement structure.
However, the brittleness of the ceramic restoration is still the Achilles heel of restricting its application, greatly influence the reliability and stability of the material properties, also limit its features to play and practical application.
The main mechanical properties of all ceramic crown and crack germination, extension, penetrating and failure process was simulated in this paper and the results has important guiding significance for the clinical use of all-ceramic crown restoration.

Focus was given to the effects of specimen size on nitriding process, because the size of micro metal injection molding (µ-MIM) product is so small and the specific surface of that product is so large that the mechanical and functional properties can be subject to change by nitriding.
Therefore, the surface properties of devices have increasingly become more important factors.
Moreover, µ-MIM specimen is so small and the specific surface area is so large that the mechanical and functional properties can be easily changed by surface treatment.
Therefore, the effects of nitriding on the properties of µ-MIM products were also investigated.
This means that the whole cross section of micro dumbbell specimen was affected by nitrogen.

Against molding defects of PA1010 injection molding products and influencing factors of the impact strength, the corresponding analysis was made.
Introduction Nylon(PA)1010 is a unique engineering plastics in China, has excellent mechanical properties, wear resistance, corrosion resistance, low temperature resistance and flame retardant properties.
From the injection molding process, the set of following parameters may affect the impact strength.
Conclusions The impact strength of PA1010 with inserts injection products is crucial，its influencing factors are related to the molding process，raw materials，molding equipment and product structure，etc ,In order to improve the impact strength of products，we need to integrate all factors in the production， combined and optimized these factors，to ensure the requirements of the product strength .
Defect analysis of plastic injection products[J].Technology information, In Chinese. 2008, 9:126~128 [6] Qiang Li.The influence factors of plastic impact test results[J].Plastics technology, In Chinese. 2008, 36(3) :6~78 [7] Yue Dong , Yilin Hu, Junlong Liu.The influence factors analysis of charpy impact strength[J].

Introduction Water inrush risk is affected by a variety of factors which are ambiguous among the degree of sign boundaries, different in effect degree, non-linear relationship.
Analysis of Water Inrush Factors of Mine Water inrush is induced by many factors, but it must have three conditions of water source, water yield and water-conducting channel.
Second, the distance between ore layer and water-bearing layer is shortened due to hanging walls and footwalls of faults slip, or the water-resisting properties is partly or totally fail due to ore layer of one wall in contact with water-bearing layer of another wall.
Theoretically, U should include all influencing factors.
Its membership function showed a linear relationship as follow[8]: u3= 0 (p-0.5)/2 1 p≤0.5 0.52.5 (4) Where p is water pressure, MPa (4) Resisting and blocking capacity of water-resisting layer Water-resisting layer play a blocking role in water inrush, its water-blocking ability is determined by its thickness, mechanical properties of rock and the integrity of water-resisting layer.

But in practice, the measure precision affected by multiple factors, such as the thermal expansion of cavity, the sedimentary water film or salt deposit in cavity, the sampling error, etc.
Calculate the water and steam thermodynamic properties using IAPWS-IF97 [5-6]
The properties of water and water vapor [M].
General calculating models of water and steam properties(IAPWS-IF97)[J].POWER ENGINEERING, 2001,21（6）：1564-1567
Study on dielectric properties of wet steam in turbine [J].

(a) (b) Fig. 1 Deformations of multi-layer microstructures subjected to thermal loading (a) spherical shape with perfect geometry and material properties (b) ellipsoidal shape with imperfection of geometry.
As a result, forecasting of the structural bifurcation and understanding how it is influenced by various factors are so crucial for the design of MEMS structures and optimization of performance and reliability for MEMS devices.
Material properties were chosen as follows: AlE =70GPa, Alv =0.33, Alα =23.6×10-6/℃ and SiPolyE − =163GPa, SiPolyv − =0.22, SiPoly−α =2.6×10-6/℃.
Therefore, in the following analysis, we introduce three main imperfections to induce structural bifurcation with the purpose of investigating how it is affected by various factors.
Although three kinds of imperfections were taken into consideration, other ones such as nonuniformity in the layer thickness due to deposition process, anisotropy in other material properties can also play a role in the behavior of structural bifurcation.