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Table 3 The physical and mechanical properties of FGD gypsum Number Fineness [%] Setting time [min] 2h strength [MPa] Initial setting time Final setting time Flexural strength Compressive strength 1(100~110℃) 8.6 11.2 72.3 0.9 1.6 2(110~120℃) 8.6 9.6 35.6 1.8 3.2 3(120~130℃) 8.6 7.5 30.4 2.1 4.1 4(130~140℃) 8.6 5.8 27.6 2.5 4.8 5(140~150℃) 8.6 5.4 23.1 3.1 5.3 Experimental Results and Discussion 1.Experimental Results.
This paper provides experimental methods and steps of research FGD by microwave technology, meanwhile, based on special effect of microwave irradiation to calcium sulfate crystals and results of physical test, mechanical test and SEM, analyzes mechanism that FGD gypsum could be changed CGD by microwave irradiation, and finds reason of obtaining bulky prism crystals in the course of CGD hydration, as well as main elements of hydration products were Ca, S, O.
[3] Yang Bo: Probe into Factors Affecting Preparation of Construction Gypsum with Wet FDG, Coal Ash. 6(2010), p 6-9
[5] Pavel Tesárek, Jaroslava Drchalová, Jiŕí Kolisko: Flue Gas Desulfurization Gypsum Study of Basic Mechanical, Hydric and Thermal Properties, Construction and Building Materials. 21(2007), p1500-1509

Simulation results for the combinations of design factors, according to the orthogonal array [3] of Taguchi method, are generated, and the optimum levels of design factors based on the response curves are obtained.
Proper settings of 3D modeling, acoustic boundary conditions, material properties of absorptive materials and perforated plates are crucial to the accurate solution of acoustic analysis.
The design factors that may affect the muffler performance include the structural configuration and interior design.
Table 4 lists the possible design factors that may affect the transmission loss of the muffler.
Subsequently, S/N ratios and curves of the design factors can be derived.

In recent years, special interest manifests itself in the synthesis and study of the properties of complex compounds of metals and obtaining functional composite materials on their basis. [14-16] Problem Statement The main objective of this work is to identify the factors that affect granulometric composition of electrolytic powders, study of the mechanism the flow of electrolysis in the presence of water-soluble polymers, combined with using a vibrating cathode, the pulsed mode of electrolysis and the composition the electrolyte used.
A large number of combinations of different levels of these factors creates the problem of choice of optimal conditions of production of powders.
Further properties depend on its flow the resulting powders.
Gaspar, Steric stabilization of nanoparticles: size and surface properties.
Moscow, mechanical engineering 1971

Table 1 Physical and mechanical properties of cement Density /(kg·m-3) Setting time/min Compressive Strength/MPa Flexural Strength/MPa Initial setting time Final setting time 3d 28d 3d 28d 3.10 123 215 28.5 55.3 5.6 8.9 Table 2 Physical properties of polypropylene fibers Density/(g·cm-3) Melting point/ Tensile strength h/MPa Elastic modulus/MPa Elongation/% 0.91 165 540 5588 23 Experimental Design.C25 pumping concrete of ultra-fine sand is prepared with water-to-cement ratio (w/c) of 0.4 and sand ratio of 27%.In this paper, initial cracking duration, maximum crack width and total crack area of concrete are tested by slab test to evaluate concrete plastic shrinkage cracking.
Choose fly ash, admixture(pumping agent, water reducing agent, air-entraining agent), polypropylene fiber and so on from the common concrete materials as testing factors to study the influence law of the performance of raw materials on plastic shrinkage of pumping concrete of ultra-fine sand.
Select the water reducing agent, the pumping agent and the air entraining as experiment factor from commonly used admixture of pumping concrete.
These are much better than affect that water reducing agent single mixed.
Fibers play the role of bridge, which increased the tensile strength of materials to resist plastic cracking depending on the adsorption bond strength between fibers and concrete, and finally decreased cracking extent by reducing fracture speed and crack width depending on its mechanical properties.

Palanikumarr 3, c 1Dept. of Mechanical Engineering, Sathyabama University, Chennai, India. 2 Dept. of Mechanical Engineering, Jeppiaar Engineering College, Chennai, India. 3 Dept. of Mechanical Engineering, Sri Sai Ram Institute of Technology, Chennai, India.
MMC are materials which combine a tough metallic matrix with high strength ceramic reinforcement to deliver superior properties like wear résistance, high strength to weight ratio, low sensitivity to temperature change and corrosion resistance [1].
The built-up edge is mostly mechanical than physical, which can be eliminated if proper cutting conditions are introduced.
Drill torque vary with feed rate, feed rate affects drilling forces and wear, but cutting speed has no significant effect over the range of speeds. 4.
Feed rate is the main factor, which influencing the torque force in the composite material.

Moreover, the physical and mechanical properties of fiberboard were also studied.
Testing Procedures for Physical and Mechanical Properties.
Testing Procedures for Physical and Mechanical Properties.
Six physical and mechanical properties were tested, namely: density, WA, TS, IB, MOE, and MOR.
The bending strength of the fiberboards is affected by several factors, such as fiber diameters, lumen thickness, and fiber length.

As the soil is a three-dimensional system which consisting of three parts named as solid particles, water and gas, the mechanical properties of the soil is quite complex under the long-term farming and compaction.
Zhang Rui et al[23] presented the details of application on simulating the soil mechanical dynamic behavior in the field of terramechanics, analyzed the feasibility of the application of DEM to describe soil dynamic property, pointed out a new direction for soil contact problems.
Ying Chen et al[25] analyzed soil-plow contact model in three different soil conditions, and indicated that the discrete element method can be used to analyze the soil-tool contact performance, but it is more complex to analysis the soil disturbance than soil cutting force, and the future directions is to study the relationship between dynamical behavior of the discrete element particles and the microscopic properties. 3 Problems For some results of the two directions in the study, there are many influenced factors in soil-tool contact model; factors to be considered by these studies are different.
Various factors should take into account in the future research; In the study of soil-tools contact force , due to the complexity of the force, it is necessary to consider the force in several directions, as well as the dead load on soil and the force on the tool.
In soil cutting, the ultimate goal to use the discrete element method is to get the changes of soil properties and the mechanical behavior, and provide the basis for design cutting tools.

Introduction The mechanical properties of solids depend strongly on their microstructure: point defects, dislocations, grain boundaries (GBs).
It has been shown that the Zener peak is a good probe to observe the order-disorder transition [14], which conditions the mechanical properties of these alloys.
The broadening factor β that corresponds to the width of the log-normal distribution of different relaxation times is found to be β= 0.5 for the Zener peak.
More precisely, the low temperature side of the peak undergoes a significant amplitude dependence whereas the high temperature side is not affected.
The mechanical loss tanf can be calculated from equations (1) to (4): (5) with (6) Plots of the theoretical mechanical loss spectrum have been drawn in Fig. 7.

Structure Analysis and Improvement of Mining Explosion-proof Control Switch Case Based on ANSYS CHEN Fei1, a, SHAO Zhi-hao 2,b and LI Jian-ming1,c 1School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China 2Shanghai Zhenhua Heavy Industry Co.
The traditional design is imperfect for lack of in-depth analysis and mechanical calculations of the case structure.
Define将焊接板作为连续整体，不考虑焊缝处材料特性的变化以及焊缝对传力路线的影响 ;Defined welded plate as a continuous whole, without regard to the effect of changes in material properties of weld and weld line on the transmission line; 3) In water pressure test, the cover of the hydraulic press closes the sealed chamber, so the case is analyzed by establishing the finite element model of the shell.
It is the necessary measure which convert complex model to finite element model, generally it does not affect the overall analysis of the general structure.
The main factors that affect the calculation include the number and density of the grid.

From the investigations, it was observed that the cutting tool was mainly the significant parameter affecting surface finish under dry cutting conditions [14].
M2 combines excellent toughness properties with an excellent abrasion resistance because of its relatively low carbon content.
It has superior cooling and lubricating properties and gives a very good surface finish.
It has rust inhibitors to impart anti-rust, anti-corrosive properties and a biocide to prevent bacterial and fungal growth in the emulsion.
All the factors and levels were analyzed and a L18 array was generated.