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Ultrasonic will have physical phenomenon such as scatter, refraction and thermal loss when it propagates to structural plane with different mechanical property, leading to ultrasonic wave velocity decrease with energy attenuation.
The factors of affecting ultrasonic propagation velocity in rock are as follows, mineral composition of surrounding rock, structure features of rock, rock porosity, ground stress, water content and temperature of surrounding rock.

It is airfoil section, form of structure, size dimension, strength, stiffness and homogeneity of mass distribution, etc. that are the important influencing factors [1].
The material of the model was Kirinoki, of which the mechanical property index was shown in Table 2.
Table 2 The mechanical property index of timber Material Modulus of Elasticity [MPa] Poisson’s Ratio Density [kg/m3] Tensile Strength [MPa] Compression Strength [MPa] timber 1.0×104 0.3 283 30 19 Load Test In order to avoid the collision between wheel and tower more effectively during vibration in rotation, a leeward loading scheme was adopted.
Test shows that leeward loading scheme hardly affected the generating efficiency, and at the same time, the collision between wheel and tower caused by insufficient stiffness, can be avoided more effectively, even avoiding structural failure
(4) Studies proves that mechanical properties of timberwork wind power generation tower model under directional wind load can be simulated well by finite element analysis software ANSYS in place of experimental analysis to a certain extent, which is significant to cut down the expenses of experiment

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.
[10] N.Ito,H.Hasegawa: Robust Optimization of the Gait for a Biped Robot on External Factors, JSME,No08-35 (2008) ,47-52
[23] 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.

Surface characteristics, mechanical and in vitro biological properties of the above-mentioned composite coatings were investigated.
For practical reference, a group of detailed data of the porous structure and the mechanical properties were reported.
Since they are formed as agglomerated structures, the factors that influence the particle size and packing also control the properties of the xerogels [394].
Hunziker, K. de Groot, Incorporation of growth factors into medical devices via biomimetic coatings, Philos.
Gander, Localized delivery of growth factors for bone repair, Eur.

They examined the dielectric properties of CuMoO4 doped with small amounts of Ag2O (0.5, 1, and 2%).
In the same way, Fuyu, Li et al. studied the dielectric properties of Co-CuO-ZrO2-Nb2O5 (CCZN) composite ceramics.
They reported a remarkable reflection loss of -49.6 dB at 9.2 GHz, indicating excellent microwave absorption properties [19].
To examine the dielectric properties, a pellet was prepared and analyzed using an LCR meter (PSM1735 N4L, Newtons 4th Ltd, UK).
Synthesis and microwave absorbing properties of CeO2/multi-walled carbon nanotubes composites.

The experimental results through mechanical tests, microscopy, digital imaging, ultrasonic compacting and hybrid joining of samples Cu-Cu, Al-Al and Al-Cu, highlight the potential use of aluminium as a substitute for multiple core copper conductors in automotive industry. 1.
Introduction Numerous active applications of ultrasounds in various branches of industry particularly in the automotive industry, are due to the effects produced by them as a result of the properties possessed by ultrasonic waves: short wavelength, high particle acceleration which could reach 109 times the acceleration of gravity, the possibility of targeting a narrow ultrasonic beam in the desired direction, the possibility of concentration and focus energy in a confined space without affecting the adjacent environment in which it propagates.[1] The ultrasonic welding takes place at a much lower temperature than the melting temperature without the addition of filler material.
Comparing experimental results by mechanical testing , electrical conductivity, digital microscopy imaging, ultrasonic compaction highlights the potential of development and use of aluminium as a replacement of connection for copper wiring in equipping automobiles.
Table 2 Sonotrode characteristics used in the experimental program Material Vsound [m/s] Sonotrode length [Mm] Resonance frequency kHz Amplification factor Maximum load Mpa/x= Oscillation node coordinate [mm] Power dispersion [Watt] C45 5334 69,7 4,0 1,45 6,33/61,5 34,5 4,8 10-3 Figure 4 Sonotrode internal stress state - maximum 86,8 N/ mm 3.

The products of HTL process can be influenced by several factors, i.e.: temperature, particle size, heating rate, ratio of the solvent and the biomass, pressure, holding time, inert gas in the reactor [3], solvent acidity [4], and type of the solvent [6].
Properties of Light Fuels.
The ligh fuel which has optimum properties was produced at a reactor temperature of 275 °C and holding time 45 min.
Lu, Bio-oil from fast pyrolysis of rice husk: Yields and related properties and improvement of the pyrolysis system, J.
Moser, Biodiesel production, properties, and feedstocks, 45 (2009) 229–266

Strata exposed inside the site can be divided into eight engineering geologic unit layers according to their lithologic characteristics and differences in physical mechanical properties, now, they are described from top to bottom as follows.
Bore bottom sediment and mud skin of pore wall were a major effect factor on bearing capacity of the pile foundation.
The existence of hole bottom sediment had holding-force layer nature of the pile-tip rock soil changed, might form compressible "cushion", and was one of important effect factors on the bearing capacity of single pie of cast-in-situ pile.
During the actual pressure grouting process, there was not some kind of slurry diffusion format to affect alone, but the diffusion was on the basis of one or two kinds of diffusion formats, supplemented other diffusion formats, and all affected simultaneously.
Therefore, bearing capacity of perfusion pile with post-pressure grouting around pile tip has something to do with the following several aspects. (1) selected foundation holding-force stratum; (2) soil type of pile body and compression properties; (3) the pile diameter; (4) the type of slurry; (5) pressure grouting control pressure and pressure grouting volume; (6) concrete grade; (7) the classification of steel framework.

However, the problems with instant rice including slow rehydration and poor quality affect the consumer acceptability.
Consequently, the low rice quality affects consumer acceptability and expectations.
To separate rice grain from the water after rice cooking, the sample was submerged into liquid nitrogen immersion (-196°C) and mechanical agitation to prevent agglomeration of rice before drying and dried by IMD and FBD immediately [9,10].
The results had shown that when the FBD temperature increased, it will affect on the hardness and stickiness of the instant rice after rehydration (P<0.05).
Suwannaporn, Optimization of instant jasmine rice process and its physicochemical properties, J.

The polymerization of ethylene glycol (a component of the coolant) in engine oil not only causes a loss of lubricating properties but also reduces the permeability of the oil in the lubrication channels, where it forms deposits that remain in the engine even after the oil is changed.
The main factors include: • Worn metal particles – produced by wear and tear of parts of mechanical systems such as bearings, shafts and gears
Consequences of the presence of water in hydraulic oil: • Reduction of lubrication properties: Water disrupts the oil film that provides lubrication between moving parts.
Baño-Morales, Assessment of Hydraulic Oil Properties during Operation of a Mini Loader.
Tribological properties of PEEK and its composite material during oil lubrication.