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So far, no known energy satisfies all properties mentioned.
This challenge will become not urgent if we can find a renewable energy satisfied all properties mentioned.
The answer is affirmative if we can find a renewable energy satisfied all properties mentioned.
Shyu pointed out that when discussing energy, there were three factors that need to be considered.
These three factors were energy source, mechanism and force.

It was shown that the surface engineering and modification of surface chemical properties by various surface passivation treatments, deposition of hydrophobic coatings and lubrication with low surface energy self-assembled monolayers are effective methods for enhancing the fabrication and tribological performance of MEMS, but it was not concern with the effect of electrostatic tangential force in the MEMS devices.
Because of the surface falling charge, any surface can produce charge and then produce the electrostatic field and formed a resistance to prevent the move between two parallel and charged flat mechanical elements.
These holes would affect electrostatic field between two parallel plates, and lead to the capacitance and electrostatic resistance to change.To simplify the analysis, it is assumed that square holes are distributed evenly in the moving plate, shown in Fig. 2.
The factors of the microscale, applied voltage and holes area are primarily considered to examine the electrostatic resistance between two charged moving elements.
Hou: Chinese Journal of Mechanical Engineering.

With the unique properties, PCL has high potential in biomedical fields.
What’s more, GO sheets are considered to be the most promising alternative to simultaneously improve the mechanical properties and barrier properties as well as thermal properties [5].
Results and discussion It is well known that the dispersion and morphology of fillers in the polymer matrix are the key factors influencing the physical properties of the polymer matrix.
PCL is a kind of typical semi-crystalline polymers, and the crystallization behavior of PCL significantly influences not only the crystalline structure and morphology but also the resulting mechanical properties.
What’s more the further work on morphology, biodegradability and mechanical properties will be carried out in next plan.

The paper regarding the HTM - Hydrogen Treatment of Materials as an attractive method for controlling microstructure and improving final mechanical properties of titanium alloys.
Hydrogen damage in titanium alloys The undesirable nature of the effects of hydrogen on the properties of titanium alloys is manifested primarily in the drop plastic properties, the impact resistance, and the formation and development of cracks in the structure.
Hydrogen may also affect the plastic flow of metals.
Increased or decreased yield strengths, serrated yielding, altered work-hardening rates, as well as lowered fatigue and creep properties have been reported [4,5].
This high-temperature treatment is very efficient for changing the microstructure and mechanical properties of two-phase titanium alloys.

Research indicates that internal structure of materials will change and produce micro-voids, micro-cracks and other forms of micro-defects acted by factors of some load or external forces .
The so-called damage is that micro-structure and meso-structure of material change under temperature,load and environmental factors during smelting or processing,which causes micro-defects to nucleate,grow,propagate and coalesce and results in deterioration of macroscopic mechanical properties of material.
Ayada thought that the hydrostatic stress and equivalent strain are the main factors which affected the void growth.He proposed the ductile criterion as Eq. 7 [22]
Zeng: Chinese Journal of Mechanical Engineering, Vol. 38 (2002) Supp., pp.21-25.
Berg: International Journal of Mechanical Sciences, Vol. 32 (1966) , pp.614

PLA (polylactic acid) is one of the best materials that might be able to replace slowly decaying plastics because of its similar mechanical and technological properties.
Ikada, Properties and morphology of poly(L-lactide). 4.
Alexis, Factors affecting the degradation and drug-release mechanism of poly(lactic acid) and poly[(lactic acid)-co-(glycolic acid)], J.
-B.Yang, Thermal and mechanical properties of chemical crosslinked polylactide (PLA), Polymer Testing 27 (2008) 957-963
Maazouz, Improvement of thermal stability, rheological and mechanical properties of PLA, PBAT and their blends by reactive extrusion with functionalized epoxy, Pol.

The process parameters are combined with wear process factors and the responses of wear tests were evaluated.
The results showed that both friction coefficient and wear rate are affected by process parameters.
The properties of the hardened layer are controlled by the energy input, which depends on the process parameters and interaction time [5].
The percentage overlap value affects the surface quality which can be calculated from Eq. 1
The percentage overlap affects the surface texture.

That is, to satisfy the geometrical similarity as accurately as possible, materials similarity, loads similarity, similar physical properties and similar boundary conditions.
Among them, the geometric similarity ratio of the main controlling factors of the model was determined as 1/40, the mass density similar ratio as 1/1, elastic modulus similar ratio as 1/20, As Table 1shown.to the lining structure, capacity of resistance to bending and bending strain make a control role to security , the bending stiffness should is major in the similar model.
Tab.1 Shaking table model test similarity relation table name indicator ratio name indicator ratio length Cl 1/40 internal friction angle — 40179 Mass desity Cρ 40179 Strain Cε= ClCρCE-1 40180 elastic modulus CE 40198 Displacement Cu=ClCε 1/80 time Ct=Cl1/2 1/6.325 Velocity Cv=ClCt-1 1/6.324 Passion ratios — 40179 acceleration Ca=ClCt-2 40179 stress Cσ=CECε 1/40 force CF=CρCl3 1/64000 cohesion Cc=CECε 1/40 frequence Cω= Ct-1 1/0.158 Viscosity coefficient Cγ=CECt 1/126.5 Damping coefficient Cξ=CρCl2Ct 1/10120 The formulation of similar material in mode The principle to select similar materials[6] Similar original materials of surrounding rock are generally compared of three types of materials ,such as core material , glue materials and auxiliary materials, The choice of similar materials should generally be complied by the following requirements: 1) Uniform, isotropic; 2) The mechanical properties is stable, not easily affected by environmental factors (such as temperature, humidity
, etc.); 3) The ratio of the material can vary the mechanical properties of materials in a larger context; 4) sources of original materials is widely, low cost, solidification time is short, easy to make models.
[5] LI Yong; ZHU Wei-shen; WANG Han-peng; etc.．Study on Mechanical Experiment of A New Type of Geotechnical Analogue Material[J].

One of the factors hindering the normal development of additive construction technologies is the lack of reasonable methods for evaluating the suitability of mixtures for printing.
This technique was previously used by us when studying the properties of mixtures for construction printing [16].
Figure 4 shows the dynamics of changes in some properties of the developed compounds over time.
Mechanical pressure in most cases is created by the screw blade, piston pressure or peristaltic method, and serves as the main factor in the directional movement of the mixture at a given speed.
Klimenko, Structure and Mechanical Properties of 3D-Printed Ceramic Specimens, Russian Physics Journal. 62 (5) (2019) 876–881.

Introduction The wide applications of glass-ceramics in various disciplines of science and technology are as a result of their superior thermal, mechanical and electrical properties [1- 3].
A number of studies related to mechanical, electrical and thermal properties of this material have shown that among others, crystal morphology/crystallinity factor governs the different properties [7-12].
We report here the preparation of magnesium aluminum silicate (MAS) glass-ceramics and study of the effect of alumina content on their dielectric properties.
It is seen that the presence of different crystalline phases with different microstructure depending upon the concentration of alumina have marked effect on the dielectric properties.
The sample having pure fluorophlogopite phase responsible for machinability shows low dissipation factor and is less affected by temperature.