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Joints with poor transmission accuracy or failing elements significantly affect the robot’s performance, regardless of the control system quality.
In order to achieve low transmission error as mechanical performance of a robot joint, the influence of worn PEEK against 7075 aluminium alloy was studied.
Due to its excellent friction and wear properties, high impact durability, high compressive durability, low specific gravity and high melting temperature of 340˚C, PEEK composite is superior to other polymers.
In the present work, a robot leg joint with a link mechanism using a harmonic drive unit was developed, and the accuracy as mechanical performance was investigated under a high load.
Lu: Effects of steel counterface roughness and temperature on friction and wear of PE(E)K-composites under dry sliding conditions, Wear,148 (1991), pp. 235–247 [21]G.Zhang, Z.Rasheva, A.K.Schlarb: Friction and wear variations of short carbon fiber (SCF) /PTFE/graphite (10 vol.%) filled PEEK: Effects of fiber orientation and nominal contact pressure, Wear 268 (2010) 893–899 [22] J.Bijwe, S.Sen, A.Ghosh: Influence of PTFE content in PEEK-PTFE blends on mechanical properties and tribo-performance in various wear modes, Wear 258(2005)pp1536-1542

In order to clarify the impact of meteorological parameters on the H&M process of BBE, the study prepares 24 representative cities in China with climate data exported from the Meteonorm platform and 3 typical bamboos with complete material properties data tested through experiments, and then sets up comparison BBE model groups in the software WUFI Plus for annual H&M process simulation.
Owing to its advantages in growing speed, mechanical strength, primary energy consumption and the carbon emissions, bamboo is regarded as an ideal material in those regions where there is shortage of wood resources [1].
The project ‘Coupled heat and moisture transfer model and experimental study on a new type of bamboo construction’ focuses on the hygrothermal stress and deformation of the plybamboo walls, investigates the microscopic properties of plybamboo, and set up a coupling heat and moisture transfer model based on its material properties [3].
WUFI Plus Model Design Based on the selected bamboos and their properties parameters, bamboo exterior walls model groups are set as boundary conditions in the coupled H&M process simulation software WUFI Plus, to simulate the annual dynamic H&M process.
It proves that the H&M process of BBE, as a hygroscopic construction, is affected not only by the thermal meteorological parameters but also the hygric parameters.

Enamel has a brittle nature comparable with that of glass [1] which makes it susceptible to mechanical failure.
Boundary conditions were appropriately modelled by resembling the actual sample constrains, and elastic properties extracted from the pertinent literature for both enamel and dentine regions [9].
It is of great importance to understand extent to which the hierarchical structure can affect the crack propagation, in particular if shield mechanisms exist or are in operation.
The presence of rods at this small scale appeared to play an influential role in altering the macroscopic mechanical behaviour of enamel.
Lee, Comparison of mechanical property and role between enamel and dentin in the human teeth, Journal of Dental Biomechanics 5(1) (2014) 1-7.

Affect its safety is the primary factor for the development of the problem, online trading is a kind of face to face, so the transaction security is very important in the development of electronic commerce.
Firewall technology is a kind of passive defense technology, it is difficult to the unsafe factors in the electronic commerce activities for effective defense.
Certificates based on public key cryptosystem, it will be the user's public key properties of the users themselves (such as name, unit, etc.). 4) the digital signature technology.
Beijing: mechanical industry publishing house, 2004 [3] Yang Fengrui: the latest computer network.

If the interface is layered between the babbitt and steel base, the wave being incident from the babbitt metal side, the reflected wave will have amplitude F(t,x) = 1122 1122 VV VV ρρ ρρ + f(t,x) (2) which means that any factor of the bond preparation which affects the density or the velocity will change the reflected amplitude.
The reflection pulse phase and amplitude intrinsically carry information of at least some of the bulk elastic properties of the adhesive and the presence of debonds.
Detection of voids is only one requirement in non-destructive assessment of factors controlling bond strength.
The mechanical system, called "Scanner" is needed to move the ultrasonic transducer with very fast and high resolution.

Introduction It is known that the mechanical properties of crystals with FCC (face-centred cubic) and BCC (body-centred cubic) structure, which do not undergo martensitic transformations (MTs), depend on the level of strength properties.
The change in the strength properties of the B2 phase (ΔσA) in aged TiNi crystals is defined by two factors: 1) a hardening (strengthening) factor Δσd.p. at the expense of dispersed particles, which are obstacles to dislocation slipping; 2) a softening factor Δσc.m. obtained by changing the composition of the matrix after ageing (Table 2); when the composition of the TiNi alloy become closer to equiatomic, the yield stress levels of the B2 phase will be lower as shown on Fig.15.
When tensile/compression deformation of [001]-oriented crystals is characterized by a high stress level due to the Schmid factors of B2-phase equal to zero for active slip systems in contrast to [11]-, [23]-, and [011]-oriented crystals, in which the Schmid factors for these slip systems are high [50].
Mechanical and functional properties of Ni54Fe19Ga27 and Ni49Fe18Ga27Co6 single crystals Functional properties Class I orientations Class II orientations NiFeGaCo NiFeGa NiFeGaCo NiFeGa Comp.
Wurzel, Microstructure and tensile properties of two binary NiTi-alloys, Scripta Mater. 44 (2001) 171-178

Firstly in the pre-stressed role, the physical and mechanical properties of slope were improved in a certain degree.
At this stage, in order to prevent a practical lattice frames excessive force to affect the quality the anchor of the lattice frames was applied to the design pre-stressed tonnage according a certain sequence classification.
It can ensure the slope stable with in unfavorable factors in the consideration.
Xi is equal to the width of C uniformly distributed in the sub force against force. [5] When Ground-based counter-force distribution determined, its value is obtained by the following equation Combined Solution: k=1, 2 ,···, n； Where: δki, Δki is coefficients and free items; Xi is a point when the ground reaction force; Y0, φ0 indicate the vertical displacement and rotation; ak is point-to-beam distance; pk is the beam equivalent load. 3.4 Two- parameter elastic foundation beam model Two-parameter foundation model is the use of two independent parameters to characterize the properties of foundation soil.

Another mechanism was proposed as the Growth Restriction Factor, in which the solutes segregate at the solid-liquid interface that restrict the growth of the solid and refinement of grains [4, 5, 6].
To understand how the combination of Sr and Ti affect the mechanical properties of the materials, the microstructures were observed and presented in Fig. 3. 0 wt. % Ti 0 wt. % Sr (Thick) 0 wt. % Ti 0 wt. % Sr (Thin) Figure 1.
The ability of solute element in restricting grain growth can be calculated by Growth Restriction Factor (GRF) [11].
Aluminium Properties and Physical Metallurgy.

In particular, micro and nano-HAp not only plays a primary role in improving the mechanical properties of the composites, but also provides a favourable environment for osteoconduction, protein adhesion and osteoblast proliferation [3].
It is known that two critical factors in producing nanocomposites with bone-like properties are a good interfacial adhesion between the substrates and the inorganic HAp and the uniform dispersion of HAp at nano-level in the supports matrix.
Moreover, the Hg-porosimetry measurements showed no significant changes between the pore size distribution of the HAp and the PPy/HAp-based scaffolds, confirming that the polymerization process inside the pores does not affect the porosity features of the ceramic scaffold. 4 5 6 7 8 9 1 0 11 12 -3 5 -3 0 -2 5 -2 0 -1 5 -1 0 -5 0 5 1 0 1 5 Zeta potential / mV p H Figure 2.

For the management of bone fractures, techniques involving the mechanical stabilization or replacement of the fractured bone with metallic materials are commonly employed.
The wettability of materials can be modulated by controlling factors such as surface roughness, composition, and crystallinity[15,16] , which affects surface and interface energy.
X-ray photoelectron spectroscopy (XPS) was also performed to characterize surface properties.
The results reveal that differences in Ti's heat treatment conditions significantly affect its wettability.
In contrast, Ti, which was hydrophobic by heat treatment, maintained its hydrophobic properties even after being stored in the air.