Search results

Noise affects sleep quality, causes athopia, headache and insomnia, and also have negative effect on physiology and psychology.
This study employed different fineness of Nylon fibers to form nonwovens and then evaluate their mechanical property and acoustic absorption effect.
Air permeability properties of 3D Nylon /LPET/RPET and 15D Nylon /LPET/RPET nonwovens as related to different weight ratios of Nylon fibers.
Factors Influencing Acoustic Performance of Sound Absorptive Materials., Australian, Journal of Basic and Applied Sciences. 3(2009) 4616-4617
Sound absorption properties of recycled polyester fibrous assembly absorbers, Autex.

Technological factors acting (operating) on the technological head The most important part of the whole device is represented by the cutting head with a nozzle, which affects not only the quality of cut, but also the quality of jet.
Pressure - One of the most important factors, which influence the division of materials, is the working pressure.
When choosing the abrasive, the most important factors that affect the cutting process and division of material are [1, 12]: Price - represents the costs of providing the abrasive and makes up to 50% of the total costs.
Bicejova, Categories of factors influenced on hydroerosion, in: Proc. 13th Int.
Cincio, Comparison of mechanical properties of surface layers with use of nanoindentation and microindentation tests Metalurgija 51/3 (2012) 309-312

During polymerization process, the synthesis parameters such as, Si/Al ratio, solid/liquid ratio, alkali concentration, curing temperature and curing time determine the final properties of geopolymer material [2].
So far only the effects of water on the physical properties of concrete where geopolymer is used as binder in the presence of sand and aggregates are reported [4].
FTIR of original fly ash as compared to geopolymer product (mix 1,2&3) Conclusion Alkali concentration and water content are proved to be crucial parameters and should be addressed separately in order to obtain desired properties.
Chaudhary, Mechanism of geopolymerization and factors influencing its development: a review, Journal of Materials Science, vol. 42, no. 3, pp. 729-746, Jan. 2007
Factors affecting the immobilization of metals in geopolymerized flyash.

These challenges are mainly due to their significant differences in thermal and mechanical properties [25].
Heat treatment, after joint development, is also essential to reduce residual stresses and improve the mechanical properties of the joint.
Friction stir welding has been used to combine different types of incompatible alloys while maintaining the desired mechanical and metallurgical properties.
Effect of pre-heating and post-weld heat treatment on structure and mechanical properties of laser beam-welded Ti2AlNb-based joints. 
Reynolds, Factors affecting the properties of Friction Stir Welds between aluminum and magnesium alloys, Materials Science and Engineering: A. 545 (2012) 26-37

Therefore, the choice must depend on a good knowledge of the properties of each material [1].
At the end, a very solid tissue is formed, apparently unchangeable but with a continuous and dynamic evolution due to biochemical stimuli (growth factors, cytokines, hormones) and to mechanical forces applied to the bone [1, 2, 11].
There are natural materials which are generally easy to find, prepare and model in required formats and composition, with mechanical and structural properties very similar to human bone tissue.
Composites may be particle-loaded polymers, fibres, ceramic/carbon tubes also in nanoscale (<100 microns) and, as hybrids, they have excellent physical and mechanical properties [15].
As regards the mechanical properties of a graft, trabecular dimensions and thicknesses also play a decisive role.

The effects of the AlN content on microstructure, thermal conductivity and thermal expansion properties of composites were investigated.
When ceramic particles are added into a polymer matrix to form a composite, they play an important role in improving mechanical, dielectric insulation and thermal properties of the composites.[6] AlN is a kind of perfect insulation ceramic with high thermal conductivity (320 W/m·K) and low CTE (4.5ppm/°C).[7] In this context, we chose AlN as the filler to improve the thermal conductivity and thermal expansion properties.
We investigated the effect of particle content on themal conductivity and thermal expansion properties.
We could not use higher amounts of AlN than 25% volume fraction due to very low tack and peel properties.
Landel, in: Mechanical Properties of Polymers and Composites, second ed., edtied by Reinhold Publishing, New York, 1994, in press [7] F.

In the Yellow river delta, the most 3 important environmental factors that influenced the saline soil are: the groundwater level, mineralization of ground water and vegetation coverage [5].
Many researchers’ study showed that the water level is one of the important factors influencing the inshore saline soil salinity [6-8].
It is composed of silt, clay and a little fine sand, the basic properties of soil are shown in Table 1.
Table 1 Basic physical properties of the tested soil pH EC(25℃) (ms.cm-1) Total salt (g.kg-1) Mechanical properties(%) 0.25~ 0.5 mm 0.25~ 0.075 mm 0.075~ 0.05 mm 0.05~ 0.01 mm 0.01~ 0.005 mm <0.005 mm 7.266 3.756 12.41 0 7.1 53.9 21.1 2.6 15.3 Monitoring device: The device used in the paper was based on four-electrode measuring method.
Soil properties influencing apparent electrical conductivity: a review [J].

The factors can be concluded as three major parts: the environmental factors, material properties and construction factors.
Environmental factors Ambient relative humidity factors.
Currently, the environmental influences and the factors of material properties have had relatively mature researches.
A study on the Mechanics Properties of Carbonized concrete [J].
Main factors affecting the carbonation of concrete and steel corrosion factor test [J].Concrete, 1993, (2).

Othman2, b 1Dept. of Mechanical Engineering, Politeknik Kota Kinabalu, Sabah, Malaysia 2Dept. of Mechanical Engineering, Politeknik Port Dickson, Negeri Sembilan, Malaysia aabdullah@polikk.edu.my, bakbar.othman@gmail.com Keywords: Quasi-static absorbed energy, Aluminum composite, Crash box Abstract.
Failure mode characteristic of composites, depends on a complex interaction between many variables terms, which include fiber volume fraction, fiber orientations, laminate stacking sequence, specimen thickness, the behavior of the fiber-matrix interface, the properties of the constituent materials, the geometry of the specimen, crush initiating device, the crushing surface’s roughness, temperature, and load application rate [3].
(a) (b) Fig. 3.Crushing performance of composite profile: (a) Quasi-static mean load against displacement (b) Quasi-static absorbed energy against displacement The energy absorption parameter in terms of quasi-static absorbed energy decreases as the number of layer decrease, due to the some factors which is the first initial load affect the absorbed energy with less surface contact on initial crush on the head specimen composite square tubes it can be seen in Fig. 4.
Increasing number of layer on thin-walled aluminum wall will affect significantly to initial peak load, mean load and also quasi-static absorbed energy.
For a reason significant factor enhancement of load should have to sustain the longitudinal and horizontal developing crack surface on top profile of composite and aluminum crash box.

Complex Nano-Scale Structures for Unprecedented Properties in Steels Francisca G.
The desire for such materials in the engineering context comes from the expectation of novel mechanical properties, particularly the stress that can safely be tolerated in service.
Bainite plate thickness and retained austenite content are shown to be important factors in controlling the yield strength.
Fatigue performance was slightly improved over 100Cr6 for one of the two industrially produced materials, but factors controlling fatigue resistance require further investigation [7].
However, its effect on the fatigue strength remains unclear, partially because it cannot be isolated from other microstructural features that are also likely to be affecting the mechanical behavior [4].