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A few processing parameters involved with the LMDS include the laser power, traverse speed, powder feeding rate, and gas flow rate, etc, which affect many factors of LMDS technology.
The powder utilization ratio is influenced by many factors.
Discussion In addition, the powder utilization ratio is affected by other factors, such as fabricating continuity, powder feeding stability, material properties.
Furthermore, the other factors, such as material properties and spot diameter, would also lead to the change of powder utilization ratio.
In general, above-mentioned factors all contribute to the calculation results of powder utilization ratio, but the experimental results still effectivelly reflect the powder effciency during LMDS to some extent.

The results showed that all the composites had poor mechanical properties, less than 160 MPa in flexural strength and 5 MPa•m1/2 in fracture toughness.
The main factor affecting the properties of the composites was investigated.
Results and Discussion Mechanical properties of the three composites were evaluated and listed in Table 1.
All of the composites had poor mechanical properties.
Bad in-situ strength of the fiber was the main reason causing to the poor mechanical properties of these composites.

Truncation error is one of the main factors of scale effect of densities of rock-fill materials.
Scale effect was defined as the differences of physical and mechanical properties between indoor tests and in-situ tests.
The measurement of soils properties in the triaxial test [R].
Evaluation of properties of rockfill materials [J].
Mechanical properties of rockfill [A].

Because of its special material properties, the processing efficiency is low and the processing cost is higher.
In addition to material properties of the drill bit, the structure and geometric parameters size of drill bit are the key factors to affect the performance of twist drill [2].
China Mechanical Engineering Vol.11 (2000), p.292 (In Chinese) [7] Y.D.Chen, H.D.Jiang.
Mechanical Engineer Vol.12 (2007), p.147 (In Chinese) [9] G.L.Ma, Q.X.Cao.
Journal of Henan Mechanical and Electrical Engineering College Vol.10 (2002), p.39 (In Chinese)

Fresh properties of this new CLSM were investigated through the tests of workability, setting time, and ball drop time.
Fresh properties of the alkali-activated CLSM affect the construction works at sites significantly.
López-Hombrados, Engineering properties of alkali-activated fly ash concrete, J.
Bradić, Mechanical and microstructural properties of alkali-activated fly ash geopolymers, J.
Ueng, Factors influencing mechanical properties of geopolymer: revealed by design of experiments, Taiwan Mining 64 (2012) 37-48

The properties of semicrystalline polymers, such as PPS, depend on its crystallization behavior [1].
Experimental part DSC / TGA analysis was performed to indirectly assess the degree of crystallinity as an important factor affecting the final mechanical properties of the PPS.
One of the factors that mostly influence the degree of crystallinity is the mold temperature into the melt PPS is injected, respectively the temperature at which crystallization takes place.
Studies dealing with the characteristics of PPS found that the degree of crystallinity affects inversely proportional to the strength properties of PPS-glass composite and that the morphology of spherulite is an important factor.
Brady, The crystallinity of poly(phenylene sulfide) and its effect on polymer properties J.

Synthetic polymers, such as polyvinyl alcohol (PVA), are popular components of tissue scaffolds because of their suitable mechanical properties, i.e., high tensile strength and elastic modulus, with controlled degradation rate [22-24].
Synthetic polymers with high mechanical strength, when blended with natural polymers, often retain both mechanical properties and bioactive components [31].
Instead of testing the chosen factors one at a time, the method designs an experiment where all factors are studied simultaneously.
ANOVA indicates PVAG ratio to be a significant factor affecting both standard deviation of fiber diameter (p = 0.019) and occurrence of beading (p = 0.012) at 95% confidence level.
Kocbek, The impact of relative humidity during electrospinning on the morphology and mechanical properties of nanofibers, Int.

Therefore, it is necessary to carry on the physical and mechanical properties of mine tailings.
Material physical and mechanical characteristics tests on Tailing Dam The article conducts a comprehensive experiment on the particle size, density, moisture content and series of physical and mechanical properties of the tailings dam in order to grasp the tailings deposition law, physical and mechanical properties and stability of tailings dam.
There is a certain relationship between tailing s’ particle size, the proportion of grain group and their physical and mechanical properties.
According to the classification of tailings composition, physical and mechanical properties such as permeability, plasticity, shrinkage, expansion can be roughly determined.
However it fails to fully reflect the complexity nature of the soil, especially for fine-grained tailings, its mineral composition, particle shape, and colloidal content are important factors to affect its physical and mechanical properties.

Among those waste materials, slag has cementitious or pozzolanicity properties, and imparted superior qualities to the high cost of Portland cement with partial or full replacement [2].
The paper described the rheology, mechanical behavior and micro properties of blended cements made from slag, the test results indicated that high performance blended material can be gained with the technology of superplasticizer, alkali-activation, etc.
Properties of Hardened Blended Cement Paste Hydration of Common Blended Cement.
Pozzolanic properties of slag is far lower than cement[4], when blended with slag, the amount of cement clinker cut down, result in hydration slow down, hydration products decrease and growth rate of mechanical strength cut down [5,6].
Alkali activator can activate potential pozzolanicity of slag, and improve early mechanical strength, secondary hydration between slag and hydration products produced by cement can improve micro structure, results in improving macro properties.

For the tailing dam stability evaluation, the corresponding provisions in the Tailings pond safety technology regulations (AQ2006-2005) are given as followed: the stability against sliding of tailings initial dam and fill dam slope should be based on the material of the dam and physical and mechanical properties of rock and soil of the dam foundation, considering a variety of load combinations, and finally confirmed by calculation.
The mechanical analysis is based on the engineering geology analysis.
There are many factors that influence tailings dam stability, the main factors are as follows:(1)the dam type of the tailings dam; (2)tailings particle size and composition; (3)water content and permeability of the tailings; (4)Permeability run line height of dam body; (5)earthquake load and other factors.
However, there are so many random factors that affect the stability of the tailings dam, it is difficult to confirm the materials of dam body and probability distribution of its physical and mechanical parameters and the probability of every factors.
Quantitative analysis methods, through the establishment of the tailings pond model, man-made to simplify the model parameters of the tailings dam model and take the external factors as fixed value, use safety factor or a similar factor of safety standards to measure the tailings dam stability.