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Based on different properties and origins, TRIZ proposes the corresponding solutions to solve them.
The technical contradiction refers to the characteristics or factors which will bring both positive and negative effects when it is improved.
Furniture innovation is a systematic and complex design process, it is affected by many internal and external factors during in the process of implementation[4].
It means factors such as the users, using environment, product status should be researched by the user's investigation, market investigation and other methods.
Then according to the ideal model, the product’s functional requirements should be defined, and then we will be able to obtain the relevant design factors.

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 preliminary results showed that coating steel with polypyrrole layer under different rotational speed can improve its corrosion resistance by a factor ranging from 1.2 to 1.88 depending on the operating conditions.
The advantages of aqueous electropolymerization are: (1) the aqueous solutions used are environmentally favorable, (2) the technique combines the formation of polymer and deposition of coating in one process and this process can be easily automated, (3) the production cost is relatively low and (4) the properties of the coatings can be controlled by varying the electrochemical parameters.
The above results can be attributed to the higher potential required for PPy layer formation at higher tartrate concentrations; this higher potential can affect the characteristics of the formed polypyrrole layer by over oxidation of the layer.
The above results can be attributed to that at higher solution pH lower corrosion of iron substrate takes place which reduce the amount of iron ions available for buffer layer formation and that can affect the homogeneity of the formed PPy layer and consequently affect its stability against corrosion while rotating in sodium chloride solution.
For examination under rotation conditions, the results show that coating steel with PPy layer can improve it corrosion resistance by a factor ranging from 1.2 to 1.88 compared to bare steel depending on the conditions at which the polymer layer was formed and the rotation speed.

Goods after plastic forming feature better strength properties.
However, low strength properties of magnesium alloys with lithium additive pose a problem.
The experiment proved that increase of lithium content deteriorates corrosion properties of the alloy.
Another step is the search for suitable coatings for magnesium and lithium alloys protecting them from corrosion factors.
Rzychoń, Magnesium alloys – microstructure, properties and application.

The research shows that sectional dimension is the most sensitive factor in the damage of SRC column and the steel ratio takes the second place, and then the strength of concrete is the most insensitive design parameter.
Introduction The structure will be injured by the excitation of seismic wave, and the mechanical property of component is degraded constantly by accumulative effect of damage.
According to the 84 groups experimental data obtained from existing achievements, the multiple linear regression formula between and main parameters which affect the deformation and stiffness of SRC column is expressed as follows: (6) where, , , , andare the strength of concrete, shear span ratio, axial compressive ratio, stirrup volumetric percentage and stirrup characteristic value, separately.
The design parameters and material properties of the original component are given as follows: the calculated height of SRC column is 3600mm, the sectional dimension of component is 800mm×800mm, the size of H steel section is H500×450×30×45, the distribution of longitudinal reinforcement in the component is 1625 and the distribution of stirrup in the component is 10@100; the degree of concrete strength is C45; the grade of H section steel is Q235; the grade of reinforcement is HPB235.
The research achievements show that sectional dimension is the most sensitive factor in the damage of SRC column and the steel ratio takes the second place, and then the strength of concrete is the most insensitive design parameter.

Decellularized native tendon extracellular matrix (ECM), which contains specific bioactive factors and a large number of collagen fibers, seeded with bone marrow-derived stem cells (BMSCs) has been found to promote tendon neogenesis.
However, tendon repair remains to be a challenge in clinic, because of the poor intrinsic healing effect, such as high risk of injury recurrence, poor mechanical properties, limited long term function recovery [1, 2].
In view of the two cues, growth factors and matrix protein, decellularized native tendon ECM gained great attention recently, which has been highly considered as a candidate scaffold in tendon tissue engineering [5-7].
On one hand, native tendon ECM harbors specific molecules secreted by the resident cells of tendon, equivalent to the role of growth factors.
However, how the arrangement of collagen fibers affects the differentiation of BMSCs was unclear.

The downtime, as we know, is one of the key factors in speeding the tunnel construction.
Table 1 selects some of the evaluated rock properties by TSP measurement at No.8 profile, #7 shaft.
It can be seen that from pile 2351 to 2372, an intact rock is concluded with little change in properties.
Table 1 Computed and evaluated rock properties by TSP measurement (selected results) (YHQW� 1R�� 
DYH� W�SH� 3RV�W�RQ� 9H�RF�W�� Vp/Vs 3R�VVRQ� 'HQV�W�� 6�HDU� 0RGX�XV� ��3D�� '�QDP�F� �RXQ !
Through interpretation of the testing data, the wave velocities and the rock properties are evaluated, and the locations, sizes of hazardous formations are determined.

The design of long-span bridge in mountainous will directly affect the quality of the whole project, so structural type selection for long-span bridges in mountain area has important practical significance. 2 The general structure types of bridge in mountain area The types of highway and railway bridges in mountains not only have a great influence on bridge design, construction and cost, but also affect the quality directly, so the structural type of mountainous bridges should be reasonably selected according to the specific circumstance of different, bridge site, mechanical properties and economy.
The structure has the merits of both continuous beam and continuous rigid frame bridge, abandons their disadvantage of both, then it has the advantages of their own in the structure of the force, the use of properties.
Several reasons may restrict the span of steel arch bridge (including steel girder bridge), such as the strength, toughness, shock resistance, weldability, other mechanical character and heavy plate rolling skill of steel plate for bridge (≤50mm) , these factors contradict each other.
The construction of these above two suspension bridges indicate that suspension bridge can be used in the mountain area, as long as the program is properly, the entire cost of the project is not necessarily higher. 7 Conclusions The design of highway and railway bridges in mountain area is influenced by a number of factors, and it is a complex problem.
According to all these factors, designer should compare a lot programs, and select the best program to ensure the coordination with the natural environment.

Scholars have studied temperature field and the mechanical properties under the action of the fire hazard.
Ian Bennetts analyzed the mechanical properties and failure time of a cable-stayed bridge under fire hazard according to the heat conduction equation and energy equation[2].Bo Ning made a finite element analysis on Ultimate of slings of a cable-stayed bridge under Tanker Fire[3].
In this research, both heating curve HCinc and ISO834 were chosen to analyze the temperature field and mechanical properties of slings, to obtain the failure time of the bridge when tanker fire took place on the middle of main span of Yingwuzhou Yangtze River Bridge.
Surfaces of bridge which are affected by the fire belong to the third boundary condition.
Fig.12 Curve of safety factor and stress of sling changed with time Result of two types heating curves was shown in Tab.2.

The actual penetration test on the cylinder for on-board storage of fuel for automotive vehicle is taken for example to make a comparison with the design method and validate correctness and reliability of the designed test methods; corresponding failure fracture is analyzed through a scanning electron microscope to validate the affect of the penetration test on safety performance of the seamless gas cylinder and predict the possible results under actual working conditions.
Fig.4 Microstructure of the Fig.5 Microstructure of the Core Section of the Bullet Hole of the Cylinder Shell Material To strengthen illustration, an untested gas cylinder is selected for metallurgical analysis, with the same sample preparation conditions and enlargement factor as those mentioned above, as shown in Fig. 6, displaying an organization of sorbite.
Fig. 6, Microstructure of the Untested Gas Cylinder Through comparison, we know that high-speed penetration of the bullet causes burning at the fracture instantaneously and then a hardened layer is formed after air oxidation of the fracture material; material of the cylinder shell is not affected for high-speed penetration of the bullet; internal metallurgical structure of the cylinder shell material remains unchanged in spite of the bullet impact test, therefore, mechanical property of the cylinder shell will not be affected; meantime, the bullet impact test does not affect structure of the cylinder shell and nor make the gas cylinder burst upon an external impact force.