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Nondestructive Evaluation in Materials Using Time-Frequency Analysis Methods Ki Woo Nam 1,a, Seok Hwan Ahn 1,b and Jin Wook Kim 2,c 1 Pukyong National University, Busan, Korea 2 Korea Institute of Machinery and Materials, Changwon, Korea a namkw@pknu.ac.kr, bshahn@mail1.pknu.ac.kr, Cjwkim@kmail.kimm.re.kr Keywords: Degraded Material, Velocity, Attenuation, NDE, Joint-Time Frequency Analysis Abstract.
WVD was found to be more effective for analyzing the attenuation and frequency characteristics of degraded materials through ultrasonic.
These materials are used in nuclear power plants pipes and reactors.
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After laser cladding, the materials were tempered for 6 hours.
Materials and Experiments The base material is H13 steel with the sample size of 100×50×20mm3.
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Carry out multiple composite test of basalt fiber reinforced concrete composite materials and other materials.
This will provide new programs for choosing materials of high-rise buildings and large span bridges.
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Introduction Laminated plate shell structures have been widely used in aerospace, construction, machinery, the National Defense Science and other fields, and the analysis of design has also been concerned by people [1,2].
Other material parameters, poisson’s ratio Fig.3 1/4 Cylindrical shell , density; cylindrical shell subjects to weight, curved boundaries are supported by horizontal diaphragm, straight edges are free.
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Importing NIPAM into hydrogel materials using methods of graft copolymerization can control the temperature sensitivity of hydrogel.
Figure 1 Formation of Gleditsia Sinensis polysaccharide-g-NIPAM Materials and Method Materials.
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This method, which would allow to link the quantitative parameters of the properties of raw materials with the required level of properties of the finished material.
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The dental ceramic materials having health care function was preparation.
The concrete operation process : At first ,it make rare earth material, far infrared emission material, surface energy adjust material, flux material mixed and ball mill 5-10 hours, then add tourmaline powder to ball mill 10-20 hours , using precipitation method prepared bioactive functional powder, after that make functional powder mixed with dental materials, ball mill about 20 hours, after vacuum stirring extraction for 30 minutes, get the high quality ceramic slurry with far infrared emission properties.
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The Journal of Prosthetic Dentistry.

Calcium oxide, phosphorus pentoxide and calcium fluoride were used as the precursor materials.
Optimisation, characterisation and rheology,” Dental Materials, vol. 29, no. 2, pp. 166–173, Feb. 2013
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