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By determining the damping properties of structures, the vibration and movement of structures can be controlled.
Very little published data exist on the vibration loss or resistance factors of composite sandwich plates.
Results and Discussion Nine foam-core sandwich plates were tested to determine the vibration mode and damping properties.
It can be seen from Fig. 2 that sandwich plates made by different fabrication processes give different damping properties.
It can be seen from Fig. 3 that fabrication process has a moderate effect on damping properties composite plates.

Table 1. 40 TRIZ innovative principles 1 segmentation 15 dynamic parts 29 pneumatics & hydraulics 2 separation 16 partial or excessive actions 30 flexible shells & thin films 3 local quality 17 dimensionality change 31 porous materials 4 symmetry change 18 mechanical vibration 32 optical property changes 5 merge 19 periodic action 33 homogeneity 6 multi-functionality 20 continuity of useful action 34 discarding & recovering 7 nested doll 21 hurrying 35 parameter change 8 weight compensation 22 blessing in disguise 36 phase transition 9 preliminary counteraction 23 feedback 37 thermal expansion 10 preliminary action 24 intermediary 38 strong oxidants 11 beforehand compensation 25 self-service 39 inert atmosphere 12 equi-potentiality 26 copying 40 composite materials 13 the other way around 27 cheap disposables 14 curvature increase 28 mechanical interactionsubstitution Table 2. 39 TRIZ engineering features 1 Weight of moving objects 14 Strength 27 Reliability 2 Weight of stationary
objects 15 Duration of action by a moving object 28 Measurement accuracy 3 length of moving objects 16 Duration of action by a stationary object 29 Manufacturing precision 4 length of stationary objects 17 temperature 30 External harm affects the object 5 area of moving objects 18 Illumination intensity 31 Object-generated harmful factors 6 area of stationary objects 19 Use of energy by moving object 32 Ease of manufacture 7 volume of moving objects 20 Use of energy by stationary object 33 Ease of operation 8 volume of stationary objects 21 Power 34 Ease of repair 9 Speed 22 Loss of energy 35 Adaptability or versatility 10 Force 23 Loss of substance 36 Device complexity 11 Stress or pressure 24 Loss of information 37 Difficulty of detecting and measuring 12 shape 25 Loss of time 38 Extent of automation 13 Stability of object’s composition 26 Quantity of substance/ matter 39 productivity Table. 3 Partial triz 39×39 contradiction matrix [1] TRIZ-based conflict-solving approaches at planning
However, the management parameter 27 “The robustness and non-sensitivity of the decisions a manager makes; affected by controllable factors from employees, departments, or a enterprise” is worsen simultaneously.
The robustness and non-sensitivity of the decisions a manager makes; affected by controllable factors from employees, departments, or a enterprise 35.

Because of large ground pressure and difficult to shape of field core-drilling when sampling, complete massive coal and rock samples of uniform mechanical properties and uniform lumpiness were sampled in the field, brought back to laboratory and further made into standard specimens.
Sample were made according to the relevant regulations of our coal industry standard 《Methods for determining the physical and mechanical properties of coal and rock》GB/T 23561.1-2009 ~ GB/T 23561.16-2010.
Sample precision should meet the relevant regulations of《Methods for determining the physical and mechanical properties of coal and rock》, that the nonparallelism of two ends was less than 0.05mm, the deviation of samples’ height and diameter was less than 0.3mm, the deviation of samples’ axis perpendicularity for the end was less than 0.25°.
Bursting liability of rock refers to properties of rock deformation energy accumulated and the production of bursting destruction.
(2)When deep mining the Zhuji coal mine, the countermeasures of coal such as the previous water injection, hole-drilling method and blasting distressing can effectively change the physical and mechanical properties of coal and rock, decrease or release the elastic potential energy accumulated of coal and rock, slowdown or eliminate the bursting resistance.

Lasers have been shown to be an effective tool for machining many materials that are difficult-to-machine using mechanical processes.
The physical properties and chemical compositions of the PCD material were given in Table 1.
Table 1 Physical properties and chemical compositions of PCD used in the study Physical Properties Value Chemical composition Percentage Density [g/cm3] 3.8-4.1 Diamond 92 Thermal conductivity at 20oC [W/mK] 560 Titanium 3-8 Thermal expansion [10-6/oC] 1.5-3.8 Tungsten-cobalt alloy 3-8 Knoop hardness [Kg/mm2] 5000-8000 Nickel 2 Graphitization temperature [K] ~700 Experimental Design.
Surface roughness is a major factor in accessing surface quality in milling process.
It can be noticed from Fig. 3(f) that the number of passes affects the surface roughness in a complex way.

Moreover, its mechanical properties can be improved by heat treatment process.
Initial experiment Taguchi experiment Experiment affect Figure 1.
Designing Taguchi experiment [6] to indicate variable level suitable for machining AISI P20 mold steel material can be divided into 3 factors and 3 levels as shown in experiment plan in figure 1.
Comparison of workpiece surface and electrode a) Machining performance b) Affect of Performance Figure 7.
Performance and Affect from machining on mold steel AISI P20 Depth 50 mm.

Introduction Microstructural restoration processes of deformed materials, like recovery and recrystallization, have significant impact on the mechanical properties of the materials.
Therefore, these softening processes are of great scientific and technological interest in particular with regard to thermo-mechanical processing [1].
On the other hand, pre-aged deformed microstructure may affect the kinetics of the recrystallization, and consequently result in different behavior.
This affected the change in hardness in the 10-cycle ARB process (Fig. 1) [7].
- The microstructure and consequently the hardness of the specimens are controlled by various factors including recrystallization, grain growth and re-precipitation at around 300°C in a complicated manner

During a typical machining operation of such alloys, high cutting forces imposed by a tool on the work-piece material lead to severe deformations in the process zone, along with high stresses, strains and temperatures in the material, eventually affecting the quality of finished work-piece.
Conventional machining (CT) of Ti- and Ni-based alloys is typically characterized by low depths of cuts and relatively low feed rates, thus adversely affecting the material removal rates (MRR) in the machining process.
However, these excellent mechanical properties are generally paired with poor thermal conductivity, high abrasivity and high chemical affinity with common cutting tool materials, thus impairing their machinability [3,4].
Material properties of the alloy are presented in Table 3.
CT Tangential UAT Tangential UAT Radial CT Radial Fig. 2: Cutting force magnitudes in the machining of Ti 15-3-3-3 at ap=100 µm The surface finish of the machined work-piece is an important factor in metal cutting.

The high-temperature corrosion of this weldment could be one of the factors of the failure.
Since the selection of consumable plays a critical part in the improvement of the weldment properties, particularly the corrosion one, three different consumables were used.
The relationship between microstructure and properties, in both mechanical and corrosion aspects, of the weldments produced by different consumables were investigated for the purpose of selecting the most appropriate.
Mechanical testing.
Ningshen, in High �itrogen Steels and Stainless Steels: Manufacturing, Properties and Application, edited by U.K.

Different parameters of dielectric properties were investigated.
Various considerations, such as preparation methods, calcination temperature, chemical compositions, ionic charge, size distribution affect the dielectric properties of strontium hexaferrites [34].
“Quality factor is the reciprocal of dissipation factor which is the tangent loss [36].”
In a nutshell, based on dielectric properties composites with a concentration of 0.20 have best dielectric properties than other composites.  
Baykal, “Structural and magnetic properties of Ce-doped strontium hexaferrite,” Ceram.

All these factors have a major effect on the geopolymerization process and on the strength of the resulting geopolymer.
Water content is considered the most important factor in the geopolymerization process [21].
[3] Davidovits J., “Geopolymer Chemistry And Properties,” In: Proceedings of 1988 geopolymer conference, vol. 1 (1988), pp. 25-48
[11] Hadjito D, Wallah SE, Rangan B.V., “Study On Engineering Properties Of Fly Ash Based Geopolymer Concrete”, Journal of Austr.
[21] Hadjito D, Wallah SE, Rangan B.V., “Study On Engineering Properties Of Fly Ash Based Geopolymer Concrete,” Journal of Austr .Ceram Soc, vol. 38, pp. 76-50, 2002