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The velocity of the determinations also indicated fresh and intact materials.
http;//www.script.org/Journal/Paper.aspx?
Materials testing.
[20] GBG: Materials testing and structural investigations- rebound hammer testing (Schmidt hammer). http://www.gbg.co.uk/?
J. of Minerals, Metall. and Materials, 16. (2009) 615-619

Much efforts are being devoted on the development of armor materials which can provide greater ballistic protection.
Amongst all materials, ultra high strength steels (UHSS) are the most extensively used metallic armor today.
Materials and Experimental Details The steel alloy was processed by melting in 20 tons Electric Arc Furnace (EAF), and followed by Ladle Furnace (LF) treatment for secondary refining.
Balakrishna Bhat, “Effect of heat treatment on mechanical and ballistic properties of a high strength armour steel”, International Journal of Impact Engineering 37 (2010) 242
Balakrishna Bhat , “Science of armour materials”, Def.

The other way is to use lightweight materials, such as magnesium.
Material Properties of Magnesium AZ31 Sheet Metal Fig. 1 shows the material composition and the initial structure of the investigated magnesium AZ31 magnesium alloy.
Investigations show that the material recrystallizes during the forming process.
Conclusion This paper discussed the material properties of magnesium AZ31 sheet metal and magnesium AZ31 tubes.
,V.212, p.256 [2] Reed-Hill, R.E., Robertson, W.D.1957, Deformation of Magnesium Single Crystals by Nonbasel Slip, Journal of metal, 9(1957), pp.496-502 [3] Chapman, J.A., 1963, Grain size and ductility of magnesium, Ph.D.

Experimental Main Materials.
Ultra-early strong polyether monomers were purchased from Levima Advanced Materials Corporation (Shandong, China), with average molecular of 2400 Da. 2-acrylamine-2- methylpropyl sulfonic acid (AMPS) and acrylic acid (AA) were received from RBL Co., Ltd.
Zhou, Present situation and developmental trends of polycarboxylate-type superplasticizers, Materials China, 28(2009) 36-45
Kim, Effects of poly{carboxylate-g-(ethyleneglycol)methyl ether} on the physical properties of cement paste, Eurasian Chemico-Technological Journal, 7 (2005) 47-55
Abnormal gelation phenomenon of class G oil well cement incorporating polycarboxylic additives and its countermeasures, Construction and Building Materials, 149(2017) 279-288

This model base consists of ability damage assessment model, damage assessment model of damage control system, the calculation model of the afloat condition and stability, the calculation model of the maximum diameter of the breach that the crew can stem, the calculation mode of the flooding quantity of breach, the calculation model of the number of support column, the calculation model of drainage quantity, the calculation model of the maximum diameter of the breach that the crew can stem when all the drainage materials available are used, the calculation model of the area of water plane, the anti-flooding plan formation model, the selection model of the optimal anti-flooding plan and the optimal distribution model of the anti-flooding resource
The examples of this knowledge base are given as follows: : IF the diameter of the breach is smaller than the maximum diameter of the breach that the crew can stem AND the flood protection materials are not damaged THEN stem the breach and make use of all the drainage appliances available to drain seawater
The results of this example contain the cabins that can be used to balance the hull and increase the reserve buoyancy, the number of the support columns in every cabin needed to be supported, the optimal cabins that can be used to balance the hull and increase the reserve buoyancy, the anti-flooding materials needed, the anti-flooding crew needed, the recovery time needed, the probability of the success of recovery work. 6 Conclusions Based on the design of the frame work of intelligent decision support system in the damage control of damaged ship, the human-computer interaction subsystem, the database management subsystem, the model base management subsystem and the knowledge base management system of this system are introduced.
Journal of FuZhou University, 1997,25(2):65~69(in Chinese) [4] Chen jing-min.
J. of Systems Science and Systems Engineering,1994, 3(3):212-217

Influence of Surface Conditions on the Fatigue Behavior of A357 Aluminum Alloy Shunong Jiang1, a* and Shiyuan Xu2, b 1School of Civil Engineering, Central South University, Changsha 410075, China 2School of Materials Science and Engineering, Central South University, Changsha 410083, China ashnjiang@csu.edu.cn, bxushiyuan112@qq.com Keywords: Fatigue strength, Four-point bending test, A357 alloy, surface condition.
A great majority of the laboratory fatigue tests on structural materials are being performed on specimens with machined surfaces, which is different from the real component surfaces.
Collins, Failure of Materials in Mechanical Design-Analysis, Prediction, and Prevention, 2nd ed., Wiley, New York, 1993
Effect of casting defects, Journal of Light Metals, 1 (2001) 73-84
Sidebottom, Advanced mechanics of materials, Wiley, New York, 1993.

Introduction Machining processes shape parts by removing unwanted materials [1].
Theoretically, efficient high-performance machining is achieved by maximizing the material removal rate.
The software was developed by Professor Dong Woo Cho, in the Department of Mechanical Engineering at Pohang University of Science & Technology, South Korea.
The geometry of the set workpiece is shown in Fig. 1a; the material of the workpiece was Aluminum 6061.
Wang, Journal of Manufacturing Systems, 7(1)(1988) p.57 [7] Z.Z.

Main parameters to be considered are related with both geometry and materials properties [6-13].
Physical properties of different materials used in the fabrication of sun point collector and flat plate collector are given in the table 2 as below.
Table 2 Properties of different materials used in sun point collector and flat plate collector Materials Thermal Conductivity {W/ (m K)} Reflectivity (%) Absorptivity (%) Transmitivity Emissivity Copper 385 - 401 92 - 94 93 - 0.07 Aluminium 204 - 250 80 10-40 - 0.05 Acrylic Sheet 0.17 – 0.2 4 50 92 0.94 Wood 0.04 – 0.17 - - - 0.9 Glass Wool 0.04 97 80 - 0.8 Chrome Paint - 5 87 91 0.09 4.
It is also observed that these values may however, be improved by using advanced focusing techniques like two axis via internal microprocessor, better materials and good bonding methods. 7.
Sen, Solar energy in progress and future research trends, Progress in Energy and Combustion Science 30 (2004) 367–416

Materials and Methods Materials.
Kennedy Hot Mix Asphalt Materials, Mixture Design and Construction, second ed., NAPA Research and Education Foundation, Maryland, 1996
State of the Art Report on Ageing Test Methods for Bituminous Pavement Materials, The International Journal of Pavement Engineering Vol. 4 (3), (2003) 165–176
Proceedings of World Academy of Science, Engineering and Technology. (2008)
[9] American Society for Testing and Materials (ASTM).

Urban expansion, characterized by the transition of surface materials from soil to concrete and asphalt, heightens the risk of flooding during heavy rainfall [15].
Applied Water Science, 12(7). https://doi.org/10.1007/s13201-022-01674-8 [16] Dewan, A., Kankam-Yeboah, K., & Nishigaki, M. 2006.
Journal of Japan Society of Hydrology & Water Resources, 19, 44–54. https://doi.org/10.3178/jjshwr.19.44 [17] Surampudi, S., & Yarrakula, K. 2020.
Environmental Science and Pollution Research, 27(2), 1521–1532. https://doi.org/10.1007/s11356-019-06849-6 [18] Uddin Kabir and Matin, M.
International Journal of Geoinformatics, 19(12), 93–105. https://doi.org/10.52939/ijg.v19i12.2983