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Damping Behavior of the High Strength Aluminum Alloy Prepared by Rapid Solidification and Powder Metallurgy Process Haitao Zhao 1, a , Junchen Yao 1, b, Yue Ma 1, c , Huibin Xu 1, d 1 School of Materials Science and Engineering, Beihang University, Beijing, 100083, China a geniemazhtao@sina100.com.cn, cmayue@buaa.edu.cn Keywords: metal matrix composite; damping capacity; rapid solidification and powder metallurgy process.
Introduction The application of high damping materials is of practical engineering importance in attenuating the amplitude of vibration at resonance conditions and reducing the probability of fatigue failure.
Compared to traditional processing technologies, MMC provided a unique approach to design and prepare materials with excellent combination of mechanical property and other useful properties.
Dai: Material Science & Technology Vol.7 sup (1999), P. 91-95 [2] P.Y.LI, S.L.
Dai: Journal of Aeronautical Materials Vol.20, No.3 (2000), P.164-171 [3] J.

Zeolites are solid crystalline microporous materials with large surface area and strong acid sites.
Since zeolites only have few surface silanol groups, it is quite difficult to introduce functional groups into the materials.
They found that it was possible to synthesise wellordered MCM-41 materials bearing alkyl sulfonic groups and tune the pore size by changing the alkyl chain length [5].
Materials and methods Raw Materials Glucose and LA used for calibration with the purity of over 99% were obtained from Aladdin Reagent (Shanghai, China).
Journal of Natural Gas Chemistry, Vol 21(2012), pp.138-147 [5] Reddy B M, Patil M K.

Velocity Temperature Characteristics of Time Domain Reflectometry Cable Length Measurement System Jianhui Song1,a, Liang Chen1,b 1 School of Information Science and Engineering, Shenyang Ligong University, Shenyang, 110159, P.
The factors conclude electrical conductor material, insulation materials, electrical conductor diameter, insulation diameter, ambient temperature, signal frequency and the cable crimp levels[1].
Considering the expression of the cable capacitance per unit length, it can be seen that the cable capacitance per unit length is proportional to the dielectric constant and insulating materials.
Therefore, the velocity should be specific analyzed according to different insulating materials and different ambient temperature.
Journal of Plant Nutrition and Soil Science Vol. 172 (2009), p. 186 [3] C.Y.O.

Moreover, it can be easily stuck on the surface of rock materials by 502 glue and has the same mechanical properties as brittle rock materials.
So it is pretty suitable for the testing of rock materials.
Because it is basically matched with the mechanical properties of rock materials, when the rock fracture occurred, pencil core sensors have relatively less hysteresis effect, in addition, lower cost. 3.
ASTM STP601, American Society for Testing and Materials, 1976, 234~244
[2] Chen Jingxi, Analysis of Correlation Factors between Stress Wave and Rock Fracture, Chinese Journal of Rock Mechanics and Engineering, 1997, 16(2): 148~ 154.

[6] Sushil., “Flexible systems management: an evolving paradigm”, Systems Research and Behavioural Science, Vol. 14, No. 4, 1997, pp. 259-269
Sohal, “Performance measurement of AMT: a cross regional study”, Benchmarking: An International Journal, Vol. 13, Nos. 1-2, 2006, pp. 135-146
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The experiments researched damage of cement based materials in the erosion solution.
Those materials reacted with Ca (OH) 2 and produced gelling substance.
So the materials which were easy to be eroded was reduced greatly.
Service Life Prediction of Existing Concrete Structures Exposed to Marine Envioment [J].ACI Materials Journal,1996, 93(6):602-608
Construction and Building Materials, Vol. 25 No. 8: 3583-3590 (2011)

Space Science Reviews. 117(2005) 23-42
Chinese Journal of Electronics. 19 (2010) 265-269
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Journal of Guidance, Control and Dynamics, 32 (2009) 1218-1231

The high energy generated among the EHP may change the material thermo-physical parameters, affect the overall thermal mechanical properties, cause the material thermal degradation, appear the phenomenon of thermal recession and so on.
The Heat Conduction Model.The three-dimensional heat conduction equation for anisotropic materials is [21] (12) in which,,and is the thermal conductivity in the x, y, z direction respectively; is the specific heat capacity, is the density,is the heat generating rate,is the absolute temperature when the time variable is.When the right of (12) is greater than zero, indicating that the object to be heated; less than zero, meaning that the object is cooled, and when equal to zero, said that the object has a stable temperature.
Shell temperature is determined by the material in contact with, so its temperature trend is the same with the previous result.
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Gao, and J.H.Liu:Chinese Hydraulics & Pneumatics(2011),p.55-59(In Chinese) [14] R.Liu, and G.P.Lin.Research on improvement of actuator cooling with loop heat pipe:Journal of Civil Aviation Flight University of China, Vol.21(2010),p.48-51 [15] I.

Chemical composition of the NS4 solution [7] Chemical reagent Weight [g/l] Calcium chloride dihydrate 0.181 Potassium chloride 0.122 Magnesium sulphate heptahydrate 0.131 Sodium bicarbonate 0.483 Materials.
Cheng, Mechanistic aspect of near-neutral pH stress corrosion cracking of pipelines under cathodic polarization, Corrosion Science 55 (2011) 54-60
Orozco-Cruz, Mechanical and environmental effects on stress corrosion cracking of low carbon pipeline steel in a soil solution, Materials and Design 35 (2012) 281-289
O’Beirne, Major field study compares pipeline SCC with coatings, Oil and Gas Journal, Tulsa, OK, USA, 90 (1992) 39-44
O’Flaherty, Analysis of stray current induced by cathodic protection on steel-framed masonry structures, Sheffield Hallam University, Open Corrosion Journal 4 (2011) 34-39 [14] Z.

Philip J R and De Vriesdevelop’s [8, 9] equations describe moisture and heat transfer in porous materials under combined moisture and temperature gradients.
Journal of Climate 2007; 20: 21-37
Soil Science, 1978, 126(3): 181-189
Moisture movement in porous materials under temperature gradients [J].
Journal of Hunan University (Natural Sciences), 2007, 7: 001-005.