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- Reduced maintenance: the higher quality materials and control used in precast concrete increase durability and reduce the need for maintenance. [3] Requirements to Connections Strength - A connection must resist the forces to which is subjected during its lifetime.
Deformation is measured between first yield and ultimate failure of the structural materials used in the connection.
Fire resistance - Connections which may be weakened by exposure to fire should be protected by concrete or grout, enclosed or sprayed with the fire resistance materials.
Cementitious materials such as in-situ mortar, fine concrete or grouting are often used in the joints between load bearing elements in columns and walls as well as for beam and floor elements.
International Journal of Research in Engineering and Technology, No.02, (2015), 767-770

Many objects made of these materials are controlled by the AE method.
Conclusion Experiments with static loading of samples with growing cracks were carried out on enough similar materials.
Builo, On the information value of the method of invariants of acoustic-emission signals in the diagnostics of pre-failure state in materials, J.
Materials Science and Engineering 44 (1980) 267-277
Yuyama, Damage assessment of reinforced concrete beams qualified by acoustic emission, ACI Structural Journal 99(4) (2002) 411-417

To increase the deformability of bulk materials, an electroplastic deformation (EPD) method is applied when an electropulse action provides stimulation of technological plasticity [5].
[3] Brailovski V., Prokoshkin S.D., Khmelevskaya I.Yu. et al.: Materials Transactions JIM (2006), Vol. 47, p. 795
[4] Prokoshkin S.D., Khmelevskaya I.Yu., Dobatkin S.V., Trubitsyna I.B. et al.: Ultrafine Grained Materials IV.
[5] Troitskiy O.A., Baranov J.V., Avraamov J.S., Shljapin A.D.: Physical bases and technologies of processing of modern materials (the theory, technology, structure and properties), Vol.1, Moscow- Izhevsk, Inst.Comput.
[7] Trubitsyna I.B., Prokoshkin S.D., Korotitskiy A.V. et al.: Journal of Functional Materials (2007), Vol. 1, No.2, p.66.

Experimental Works Materials and mix proportions.
Acknowledgement The authors wish to acknowledge the financial support of Korea Science and Engineering Foundation (KOSEF).
[2] American Society for Testing and Materials, Test for Pulse Velocity Through Concrete, ASTM-C-597, (1991)
Johnson, Nondestructive evaluation of early-age concrete strength in plate structures by the impact-echo method, ACI Materials Journal, Vol. 52(1986), p. 297-302
Popovics, Analysis of the concrete strength versus ultrasonic pulse velocity relationship, Materials Evaluation, (2001), No. 2, p. 123-130.

Introduction Over the years, diamond-like thin films, also known as DLC films are of interest to researchers as they have many properties similar to diamonds, such as high mechanical strength, chemical inertness, high optical transmittance and wide energy band. [1] These outstanding features make it a promising material for surface forces like friction, power photovoltaic applications and new electrode materials. [2-3] The core of these properties is that the DLC film consists of a network of sp3 and sp2 coordinates.
Grill, “Diamond-like carbon: state of the art,” Diamond and Related Materials 8, 1999, pp.428-434
Corat, “Adherent Diamond-Like Carbon Coatings on Metals Via PECVD and IBAD,” Brazilian Journal of Physics vol.36, 2006 pp.986-989 [5] F.
Ferrari, “Determination of bonding in diamond-like carbon by Raman spectroscopy,” Diamond and Materials 11, 2002 pp.1053-1061 [10] C.T.
Robertson, “Diamond-like amorphous carbon”, Materials Science and Engineering R37, 2002 pp.129-281 [15] Adliene D, Laurikaitiene J, Kopustinskas V and Meskinis S “Mater Sci Eng 06”, 2008 pp.005

At present, the study of soil amendment was more and more in China or other countries, most of which focused on high Polymer materials.
Materials and Methods 1.1 Sites description The experimental field was located in Yijianfang village (111°39′E, 39°57′N) of Qingshuihe County, Hohhot, Inner Mongolia, China.
The soil is loess, and organic matter is 10.96 g·kg-1, total nitrogen is 0.49 g·kg-1, total phosphorus is 0.43 g·kg-1, available nitrogen is 35.10 mg·kg-1, available phosphorus is 4.55 mg·kg-1 and available potassium is 118.90 mg·kg-1. 1.2 Experimental materials and Design Experimental crop: Millet.
Journal of Irrigation and Drainage, 2006,25(4):56-59.
Agricultural Science of Beijing,2001,6:18-20.

Rizzo Department of Materials Science and Metallurgy, PUC-Rio, Rua Marquês de São Vicente 225, Gávea, Rio de Janeiro, CEP: 22453-900, Brasil mauricio@dcmm.puc-rio.br, rizzo@dcmm.puc-rio.br Keywords: Oxidation; high-speed steel; thermobalance; dry and moist environments.
In general, HSS shell materials are based on combinations of carbon, chromium, vanadium, molybdenum, tungsten and sometimes niobium and cobalt.
It is well known that the oxidation behavior of the metallic materials depends on the chemical composition and the microstructure.
Kofstad: Corrosion science, Vol. 17 (1997), p.237
Meussner: Journal of Electrochemical Society, Vol.12 (1963), p.1195

When used two different materials as adhesive for particleboard, composition ratio and press temperature are an important factor in board production [4, 14].
Experimental Section Materials.
The materials were then dried at 60 °C overnight and powdered using a mill machine.
Prayitno, Manufacture and properties of citric acid bonded particleboard made from bamboo materials, Eur.
Ragadhita, How to read and interpret FTIR spectroscope of organic material, Indonesian Journal of Science & Technology 4 (2019) 97-118

Materials and Methods Sequencing batch reactor and operation.
Beijing:China invironmental science Press, 2002
Journal of Bioscience and Bioengineering.

Reduction of nitrogen and phosphorus content in piggery water with algal culture Ying Shen1, a, Jing Wang2, Wei Chen1, Xiangyang Lin2 1 College of Mechanical Engineering and Automation, 2 College of Biological Science and Technology, Fuzhou University, Fuzhou, Fujian, 350000, China ayshen@fzu.edu.cn Keywords: Algae, nitrogen, phosphorus, biomass, Scenedesmus obliquus Abstract.
Materials and methods Microalgae inoculation and growth medium preparison.
Lan Enhancement of lipid production using biochemical, genetic and transcription factor engineering approaches (Journal of Biotechnology, 2009)