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For certain upper truss, the main affect factor of dynamic characteristics of a TSS are prestress of the cables, pole number, rise-span ratio and vertical span ratio.
In this paper, the mode testing experiment and finite element analysis is executed, to study the changes of the lower modal frequencies in different prestressed cables and to study the influence of the prestress to the dynamic properties of TSS.
With similar geometry and mechanical properties, these two type are all referred as string structure [1].
To certain truss, the main affect factor of dynamic characteristics of TSS is prestress of the cables, the pole number, rise-span ratio and vertical span ratio.
In this paper, the mode test experiment and finite element analysis is executed, to study the changes of the lower-order modal frequencies in different prestressed cables and to study the influence of the prestress to the dynamic properties of TSS.

In the regulation of the organic matrix, it can be directed self-assembly into specific biological minerals, and can give the bone good mechanical properties and biological activity.
They can provide mechanical and biological properties for the organization.
Literature shows that crystal structure of hydroxyapatite thin can ensure that the bone has strong and not brittle, hard and soft mechanical properties.
These are the main factors causing the sports injury.
Nano calcium phosphate can be synthesized with special structure and morphology in the future, make its surface can have special topology or physical and chemical properties, and can selectively adsorb biological protein or biological factors.

It is generally believed that carbon content is an important factor affecting the high-temperature mechanical properties of the material[4-5].
If carbon content is too low, the material mechanical properties will be greatly reduced.
Therefore, due to short-term high temperature overheating, the reduction of sample mechanical properties is the main reason for its cracking.
The insufficient of mechanical properties at high temperature is the main reason for the tube burst
Analysis of microstructure and mechanical properties of different high strength carbon steels after hot stamping[J].

The mechanical properties like tensile strength and microhardness were evaluated.
They obtained 1degree as the best tilt angle for a defect-free welding with high mechanical properties.
They observe that the tilt angle affects the mechanical properties of the FSW joints considerably.
The chemical and mechanical properties of the material are shown in table 1 and table 2 respectively.
Taking into account complicated stir zone processes with many factors to consider, the hydrodynamic theory was used.

Several groups of experiments were carried out to investigate the effect of the specimen configuration and the loading speed on the tensile properties.
Mechanical properties in tension are very important to establish the material properties for structural design, installation and maintenance [1].
Since there isn't any standard for the multi-axial tensile testing, the factors, such as the configuration of the specimen and the loading speed, which might affect the testing results were investigated.
This shows that the mechanical properties in warp direction of the coated membrane materials play an important role in the tensile failure under multi-axial loads, whatever the initial crack length and the crack orientation is.
This emphasizes the importance of the tensile properties in warp direction when the coated membrane materials are suffering from multi-axial tensile loads.

Many academic institutions have been actively involved in the study of optical thin films by developing new surface nanostructure technologies to create nanofilms with low surface energy, high mechanical strength, high adhesive properties; or anti-reflection, self-cleaning, dirt-repelling, or anti-bacterial properties.
In this study, the five key factors affecting ultrasonic SiO2 solution spraying are as follows: (A) movement speed, which affects the amount of spray solution deposited on the substrate–a faster axis movement results in faster deposition and less solution on the substrate; (B) flow rate of solution, which affects the amount of ultrasonic fog and indirectly affects the film thickness; (C) airflow strength, which affects the spraying coverage; (D) nozzle height, which affects the density of the film; and (E) spray gap, which affects the uniformity of the surface coating at areas of overlap.
The thin film formed by ultrasonic spraying is correlated with the five control factors listed above.
Because there are five factors and each factor has five levels, there are 20 degrees of freedom in total.
As all five control factors except for factor C have significant effects, but the F value of factor C is close to the significant value, all five factors are taken into account in the prediction.

Aiming at multiple horizontal fractures should be located exactly in hole, based on its affecting factors intensive analyzing in fracturing and field technological stimulation mechanism research, a study and application of hydraulic jet fracturing (HJF) has been introduced.
Where the flow rate will severely affect the second fracture initialization especially in critical in-situ stresses conditions.
For C6 reservoir, temperature is not high, fracturing fluid anti-shearing properties is necessary only.
Regardless what the interbed in stimulation it is, mechanical sealed packer stimulation is impossible for the space, at least 4m needed usually (refer with: Table 1).
To confirm HJF effect, we have selected adjacent wells conventionally fractured in the same producing layer and in the same cluster well group as compared wells, the compared producing layer have the nearly same properties on well logging.

Introduction Ti-15V-3Cr-3Sn-3Al (Ti-15-3) titanium alloy is a kind of metastable β-titanium alloy, known as low-cost, high-intensity, and good properties in cold rolling and cold forming process.
This would definitely cause spring back phenomenon [5-8], which has severely influences on forming precision, while researches related to the mechanism and controlling factors of spring back are still inadequate.
V-shaped bending spring-back influencing factors and experimental Study, Forging & Stamping Technology. 5(2002) 22-25
Influencing factors and contrl methods for bending spring-back workpeice, Aerospace Manufacturing Technology. 2(2007) 57-59
Zhan, et al., Coupling effects of material properties and the bending angle on the springback angle of a titanium alloy tube during numerically controlled bending, Materials and Design. 31(2010) 2001–2010

The main requirements for the sewage lining are waterproofing properties, mechanical strength, corrosion resistance, resistance to hydro-abrasive wear.
This leads to uncertainty when creating new means of protection of concrete lining from the effects of external factors and aggressive media flowing through the collector tunnels.
The main requirements for the lining of sewage collector tunnels can be divided into the following: • waterproofing properties [17], [19]; • mechanical resistance [10], [11, [13]; • corrosion resistance [4], [5]; • resistance to hydroabrasive wear [6], [8], [18].
Waterproof Properties of the Lining Waterproof properties of the lining of the sewage collector tunnels should provide them with sufficient resistance, including the capillary movement of moisture in the pores of the concrete.
Factors influencing the development potential of urban underground space: Structural equation model approach. – Tunneling and Underground Space Technology.

However, the mechanical behavior and durability of WAAM-fabricated UHS steel components are influenced by various factors, among which surface quality plays a critical role [2-3].
The mechanical properties of the UHS steel wire are presented in Table 1, while its chemical composition is presented in Table 2.
Mechanical properties of the UHS steel wire.
Mechanical properties of the WAAM UHS steel.
The sensitivity to crack initiation is particularly pronounced in UHS steels, making surface quality a critical factor affecting fatigue performance.