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The new status indirectly points that production uncertainty or manufacturing defect could be the potential factors for this adversity.
These includes loss of gloss, discoloration and hardening of the surface layer [8] and the most affected properties would be the elongation and flexural and impact strength [10].
It is assumed the in-service helmets physical and mechanical properties were equivalent to the newly produced.
This is due to the hardening of the shell outer layer after a prolonged exposure to environmental factors such as UV radiation [8].
‘Influence of environmental factors on energy absorption degradation of polystyrene foam in protective helmets’.

China 2Department of Mechanical and Electronic Engineering Chengdu Technological University, 611730 Chengdu SiChuan Province, P.
The results show that the ratio of volume to area of the current filament and the average carrier density in the current filaments are two key factors that affect the photoionization effects of the current filaments.
The density distribution properties of the photo-generated carrier from the spontaneous emission at the tip of the filament in a special absorption region are analyzed.
The further calculation shows the ratio of volume to area of the filament, VT/ST, is a key factor to affect the radiation effect of the filament.
The ratio of volume to area of the filament and the average carrier density inside the filament are two key factors that affect the radiation effect.

This result engendered a serious threat to safety of people life and property, caused devastating consequences to nearby residents, affected social harmony and stability.
Coal mine enterprises have done a lot of works on overburden subsidence and ground movement prediction, related mining damage to buildings and other issues affecting evaluation, obtained many beneficial experiences and outcomes.
As a qualitative evaluation of the movement of overlying strata in the "three zone " theory in our country is widely applied, accumulated certain experience, but according to formula (1), calculating caving height to only consider the orebody mining thickness factor, ignoring the rock properties, dip angle and other factors, which to some extent affects the accuracy of judgment.
But as a result of simulation being the ideal model of empty area, the rock mechanical properties makes its weakening due to the time effect around the ore and surrounding rock.
As time is going on, the strength of surrounding rock will reduce gradually under the influence of factors such as goaf in groundwater, geological movement in underground mining and blasting.

In addition, the cutting speed was significantly affecting the tool life.
There are many factors influencing the tool life when machining cast iron.
Due to the various factors that affecting the tool life and machined surface in machining cast iron, this study was carried out to investigate the effect of various dry cutting condition environment on the tool life and surface finish when turning ductile cast iron FCD700 using coated carbide tool.
Table 2 shows the mechanical properties of the coated carbide insert AC700G.
The cutting speed is significantly affecting the tool life.

Moreover, the reliability of metal equipment is determined by structural changes and mechanical properties under the influence of operational factors.
Also, factors affecting the degradation of the mechanical properties of steel are heat, corrosion and mechanical impact during the operation, including technological and unscheduled stops [2].
The magnetic properties of the layer is determined by structure of FeNi3 (strong ferromagnetic).
At this concentration of iron and operating temperature a layer of α-Fe (ferrite) with a bcc lattice and ferromagnetic properties can be formed.
Determination of the Mechanical Properties of Metals by Hardness.

Secondly, in the application environment of cement-based materials, factors such as humidity and cracks may affect electrical conductivity.
It has many extraordinary properties.
However, the addition of an appropriate number of nanofibers can improve the mechanical properties of concrete[51].
Doped nanoscale conductive materials can effectively fill pores and improve the mechanical and electrical properties of cement[54].
Deng, Influence of electrochemical oxidation of carbon fiber on the mechanical properties of carbon fiber/graphene oxide/epoxy composites, Compos.

The effects factors of system experiment are studied and analyzed, including the misalignment and the rub-impact stiffness on system responses.
Those are the two aspects of rotating shaft-mechanical seal system, that is to say in this system, characteristics of liquid film are influenced by movement of rotating shaft and seal rings, characteristics of rotating shaft and seal rings are also affect characteristics of liquid film.
For systematically solving dynamic performance of rotating shaft-mechanical seal system influenced by rotating shaft, this paper investigate on the interference factors by experiment including rotation ring and stationary ring of the mechanical seal and coupled between the both.
The sealing performance of mechanical seal is studied when the rotating shaft is under steady excitation and excitation of excitated frequency disturbed in different working state and these disturbing factors lead misalignment, rub-impact and so on.
Properties of clear polyurethane films modified with a fluoropolymer emulsion.

In mould design, the gate location, runner/gate system and cooling system design are the major factors affecting not only the warpage and part quality but also the injection moulding cycle time.
The most important reason for this is because of the properties of the plastic material.
Some of these properties are lightness, resistance to corrosion, ease to give shape.
Plastic materials physical and chemical properties can be changed as desired.
The warpage is predicted from the temperature difference between the upper and lower surfaces, the temperature distribution, flow-induced shear stress, shrinkage, and anisotropic mechanical properties caused by fiber orientation.

The effect of physical properties on the interfacial adhesion properties of fiber reinforced nylon66 composites have been investigated in this paper.
Thus, the interphase in fiber-reinforced composites plays a very important role in determining the composite mechanical properties.The interphase is a very small region over which the mechanical and physical properties change from the bulk properties of one component to the bulk properties of the other component (polymer).
The properties of the interphase can significantly affect the load transfer characteristics and the macroscopic mechanical response of the composite under external loading.
It is well recognized that dispersion, wetting and interaction between fiber and polymeric matrix are critical factors in designing fiber reinforced polymer composites[4].
Enhancement of the mechanical properties.

Measurement of the Incident Sound Power in Ducts and Effect factors Analysis Zhao Hai-jun1，a ，Deng Zhao-xiang2，b 1 Department of Mechanical Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China 2 State Key Laboratory of Automotive NVH and safety control，Chongqing 400039, China ahjzhaoly@sina.com, bzxdeng@equ.edu.cn Keywords: Incident sound power, Effect factor, Two-microphone method Abstract: Based on two-microphone transfer function method, the measuring method of incident sound power in duct is introduced, The special test equipment is built, and the test and measurement program of incident sound power in duct is written, and effect factors of measurement are analyzed.
Hans and Mats more systemically researched production reason of measurement error and effect factors in 1986, the factors mainly included transmission function, spacing of the microphones, and so on.
As measurement of the incident sound power is realized with no ready-made program, it need self design special program to measure accurately, and analyzing effect factors is carried through.
Transfer function method of measuring in-duct acoustic properties.I.Theory.
Influence of errors on the two-microphone method for measuring acoustic properties in ducts.