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In previous literatures, the researchers focused on the fabrication methods, polarization affecting factors, noise elimination, direct current (DC) stability and the development of novel metal surface electrodes.
Searle et al [14] compared the properties of Ag/AgCl electrodes made of stainless steel, aluminum and titanium, but the electrode impedance test for a long time is not reported.
Gong et al [6] taking the gel-to-gel connected method to directly measure the impedance properties of electrodes to analyze the impedance-time properties of Ag/AgCl electrodes with different conductive gel.
To sum up, the performance evaluation of impedance properties and stability of Ag/AgCl electrode are lacking in current literature.
In order to investigate the effect of current size on AC impedance properties of electrodes, the stimulating current was set in the range from 0.5~50 mA.

However their mechanical properties and tribological properties are still lower than that of commonly applied materials.
Mechanical properties were evaluated by birnell hardness test in stir zone.
Tensile mechanical properties and failure behavior of FSP modified Mg-Al-Zn and dual phase Mg-Li-Al-Zn Alloys.
Microstructural and Mechanical properties of Al-Fe in situ Nano composite produced by friction stir processing.
Microstructure and mechanical properties of friction stir welded joints of AC4A cast aluminium alloy.

According to these factors, the high strength steel should be widely used in automotive parts.
In these processes, the properties of roll forming basically meet the needs of the high strength steel, and this forming process is gradually accepted by other industries.
Low strength steel has this property.
(a) (b) Fig. 9 The mechanical properties of 22MnB5 and CCT curve Forming.
The transformation from austenite into martensite causes an increase in volume, then the volume fraction of martensite directly impacts the residual stresses and mechanical properties Conclusions High-strength steel is the most effective way for energy saving, emission reduction, improvement of vehicle safety, while the roll forming process fully makes use of the performance of high strength steel.

Meanwhile, the changes adhesion properties, functional groups, and corrosion resistance properties increasing with aging time were determined.
Some studies proved that during later period of corrosion coating properties largely depended on the zinc-rich primer with appropriate zinc powder addition ratio, and do not degrade other mechanical properties[9-10].
Photo-oxidation was one of the most common environmental aging factors in coating service life, which could decrease both resistance and mechanical properties of coating[11].
The changes in thickness, mechanical and electrochemical properties, and microstructure of epoxy zinc-rich coating with aging time increasing were studied, and the electrochemical impedance spectroscopy (EIS) plots were obtained and analyzed.
Yu, et al., A study on small punch test to characterize mechanical property of aged high-density polyethylene (hdpe).

Mainly their variability in time is affecting speed of diffusion flow and causing that each historic building, or area, is unique.
In all above stated materials were performed tests aiming to obtain full overview of their mechanical and physical properties.
Properties relevant for basis of the experiment are stated in table 1.
Tab. 1: Monitored properties of used materials Tab. 2: Marginal conditions of the experiment (average values during tests) 4.
Water vapour resistance factors of three wall surface finishing.

Some of the fatigue properties are also improved compared with the fiber reinforced composites, mainly the damage tolerance to low-energy impacts, an important issue in fiber reinforced composites.
The most recent application of GLARE is in the upper fuselage shell of the A380 that offers 15-30% weight savings over aluminum panels with improvement in fatigue properties, [12].
This scenario is highly conservative since it does not take advantage of the damage tolerant properties of the metals.
References [1] Martinez-Val, R. and Perez, E., Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, vol.223, n.12 (2009), 2767-2820
[8] Zaki Ahmad; “The properties and application of scandium-reinforced aluminum”; JOM Journal of the Minerals, Metals and Materials Society, vol.55, n.2, (2003) 35-39

The comprehensive evaluation model for aircraft Three-Proof performance under the influence of multi-factors is established by using the technology of multi-index comprehensive evaluation synthesis.
On the other hand, it may produce corrosion and destruction in combination with other environmental factors, such as the salt air and some organisms.
The growth of mildew directly (degrade) or indirectly affects (by deposited pollutant) the equipment, changes its physical properties, and then affects the function and use of the equipment, for instance, reducing the electric performance of insulation materials, causing malfunction of electronic or electrical equipments, causing corrosion and jamming of the fuel system, destroying the seal, causing metal corrosion, and etching the glass.
By integrative consideration of the above factors, the aircraft Three-Proof evaluating index system supported by seven major evaluating points is established, as is shown in Table 1.
These may be caused by some experts giving weights that are quite different from the real value owing to their unfamiliar with the properties of some indices, owing to the strong subjectivity of the survey data.

Currently, the studies of CPUS mainly focus on the influences of piezoelectric element on the properties of the sensor, rare study concerning the influencing factors that affect the performance of CPUS has been conducted.
The properties of the piezoelectric composite are shown in Table 1.
It can be seen that the 1-3 cement-based piezoelectric composite has good piezoelectric properties: a high electromechanical coupling factor Kt and a small mechanical quality factor Qm, and thus it is an ideal alternative for producing broadband ultrasonic sensor [10, 11].
Table 1 Properties of the 1-3 cement based piezoelectric composite Piezoelectric strain factor d33/[ pC·N-1] Piezoelectric voltage factor g33/[mVm·N-1] Dielectric constant εr Thickness electromechanical coupling coefficient Kt/% Mechanical quality factor Qm Dielectric loss tanδ 398 71.2 631 63 12.60 0.0315 The CPUS was made by using the 1-3 cement-based piezoelectric composites as a sensing element, metal powder/epoxy resin composite material as the backing material and cement/epoxy resin composite material as matching layer.
Effect of forming pressures on electric properties of piezoelectric ceramic/sulphoaluminate cement composites [J].

As is known, the value of Lc is affected by a number of extrinsic and intrinsic factors.
The extrinsic factors refer to the test parameters.
So it seems theoretically Lc is mainly determined by the intrinsic factors including the hardness of the substrate and the coating, etc[10].
These two factors both do favor to the adhesive performance.
The results show that the adhesive and the wear properties of the chromium coating could be promoted by the treatment.

In the shape detecting process, affected by temperature, humidity, magnetic field, vibration, installation geometric errors, process allocation and other working condition factors on site, online shape signals may be distorted in most case, and can not reflect true shape condition.
The differential circuits are composed of radial symmetrical two sensors for eliminating signal drifting which may be caused by temperature, humidity, vibration, magnetic and other factors.
The optimized structure of detecting roller not only has good mechanical transfer properties, but also has the maximum Mises stress in the safe range.
Multiple isolation measures were used to prevent industrial interference signals of magnetic, temperature, humidity, vibration and other external factors.
Journal of Mechanical Engineering, Vol. 47 (2011) No.12, p.56-61.