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According to GB/T 229-2007 Metallic Materials - Charpy Pendulum Impact Test Method, the impact specimens were cut from the weld bead, with the standard size 55mm×10mm×10mm.
Under the same condition of experiment, the bigger the proportion of fiber area and shear lips, the better of the material’s toughness.
Journal of Materials Processing Technology, 226 (2015) 272-279
Ph.D. thesis, University of Science and Technology Beijing, Beijing, China, 2015
Welding thermal simulation experiment on SMA490BW material [J].

Lost circulation materials like one-way pressure sealant and superfine calcium carbonate were used to stop the leakage.
The Recommended practice for laboratory testing of bridging materials for drilling fluids (SY/T5840-2007) does not consider formation pressure when examining sealing capacity of plugging materials, so we added backpressure of 0.5MPa to simulate the pressure of low-pressure leakage zone in order to better reflect the bearing capacity of fuzzy ball pad fluid.
(2) Cementing operation was a one-time success, which not only reduced the cost directly, but also decreased the formation damage by minimizing the leaking of cementing materials into the formation, so the oil/gas production may be improved and the reservoir stimulation cost may be cut
Chinese Science Bulletin. 15(55). 1220-1228. (2010) [2] Zheng Lihui, Cao Yuan, Han Zixuan: Novel low-density drilling fluid containing fuzzy ball structure.
Journal of China Coal Sociey. 35 (3). 339-442. (2010) [4] Li Liangchuan, Lu Shuqin Pengchuan: Fuzzy-ball workover fluids for formation damage control in Jidong Oilfield. 33(3).31-34. (2011) [5] Zheng Lihui, Zhang Mingwei, Lin Yong: A Multifunctional Drilling Fluid for Coalbed Methane Drilling. 2011 International Conference on Energy and Environment.

Consequently, they were widespread used as modified RAC materials at present[3,4].
Material Tests The materials used were Ordinary Portland Cement ,river sand, natural crushed stone, potable water of Xi’an.
The age of concrete at the model test day and material test day were 28 days respectively.
Due to the discreteness of concrete materials and the process of producting or loading of the human influence, we made some results comparatively large difference, such as making the experimental value of 14% lower than the actual value.
[4] Ding Chunlin, Zhang Guofang, Zhang Hua.Experiment and Comparison on Shear Behavior of New Type Rod-like Polypropylene Fiber Reinforced Concrete[J].Journal of Tongji University (Natural Science), 2011.39(6):802-806

This is not an exception for low-temperature engineering and related fields of science and technology.
Good miscibility of the refrigerant with lubricating oil and materials compability are the key factors besides high dielectric strength especially in the vapor phase, lower freezing point temperature and low cost of the refrigerant.
The predominant refrigerants in use today are members of the halocarbons family of chemical compounds i.e., so-called halogenated hydrocarbons or fluorocarbon refrigerants In 1928 Thomas Midgley along with Albert Henne managed to synthesize a small quantity of chlorofluorocarbons CFCs and hydrochlorofluorocarbons which could be produced with hydrocarbons as raw materials.
Also important are thermodynamic properties, low flammability and toxicity, cost and compatibility with the materials of construction.
HFOs New, Low Global Warming Potentials Refrigerants// ASHRAE-Journal. – 2009. – August. – 51(8). – P. 22-29

Furthermore, the addition of small amounts of Al and Si constituents to the nanocomposite structure of these materials considerably improved their tribological and anti-corrosive properties at operating temperatures exceeding 400 °C, such as hardness and wear resistance, thermal stability, and denitrification temperatures [4].
For bulk materials, e.g., as the steel substrate Meyer’s index is a good measure of the indentation size effect (ISE) [9].
Conversely, n>2 represents so-called reverse ISE behavior, whereas at n=2 the ISE is absent for the given material at the applied indentation depths.
Acknowledgements This research is funded by the Latvian Council of Science, project No. 2019/1-0385 “Carbon-rich self-healing multifunctional nanostructured smart coatings (NSC) for high-tech applications using high-power confined plasma technology for their deposition”.
Bajajb, A critical review of diamond like carbon coating for wear resistance applications, International Journal of Refractory Metals & Hard Materials. 78 (2019)107-122

Introduction Acoustics as a science may be defined as the generation, transmission, and reception of energy as vibrational waves in matters [1].
Its properties are material density: 7800 kg/m3, Young’s modulus: 200 Gpa, Poisson ratio: 0.3, thickness: 0.01 m, air density: 1 kg/m3, and wave velocity in air: 334 m/sec.
Arnold, “Parameter Estimation in Engineering and Science,” Wiley, NewYork, 1977
Hematiyan, “An efficient inverse method for identification of the location and time history of an elastic impact load,” Journal of Testing and Evaluation, Vol. 37, No. 6, Paper ID JTE102179, 2009

Psychological “adaptive theory” points out that the duration of material incentives is shorter than that of the spirit incentives.
Zhong-Ming Wang: Management Competence: A Structural Equation Model Testing, Psychological Science, Vol. 5(2002), p.513 [3].
Feng Ming, Ji Xiaoli, Fu Maohua:Manufacturing Sector Management Competence and Firm Performance of Chinese, Journal of Applied Psychology, Vol. 13(2007), p.347 [4].
Du Juan:Management Competence and Job Performance of Manufacturing and Service --- A Comparative Analysis, Social Sciences, vol.9(2009),p.46

Introduction Drilling histogram is the most basic and important geological maps, but hand-drawing consumes a lot of manpower, material and financial resources, not flexible and low efficient.
Which large Chinese character intelligent software system gather the most advanced graphics, images, geology, geography, Remote sensing, mapping, artificial intelligence and computer science, is that spatial information systems gather map input, database management and spatial analysis.There are five spatial entities: point, line, area, network, tables ,which were stored in different workspace.
[2] Chen Lianwu. 2002, Application of MapGIS in geological mapping , Journal of Xi’an University of Science & Technology.

The material of the liquid was chosen as pure water under the condition of 293 K temperature and 1 standard atmospheric pressure.
Acknowledgements This work is supported by the Zhejiang Provincial Natural Science Foundation of China (Y5090235) and Key Discipline of the Ocean Mechatronic Equipments Technology Foundation.
Jennings: Marine Fisheries Ecology (Oxford: Blackwell Science, U.K. 2001) [2] K.
Nichols: Journal of Computational Physics, Vol. 39 (1981), p. 201 [9] J.W.

Different kinds of magnetic fluid used in experiment are shown in Table 1 and The experimental results are shown in Fig.4 The material of the permanent magnet in the experiment is NdFeB, Br=1.35T, Hc = 1040 kA/m, (BH) max=320kJ/m3.
Acknowledgments The authors would like to thank the Science Research Foundation of Beijing Jiaotong University (50875017).
Gu, et al, Effect of the gap of magnetic fluid seal on seal capacity, Journal of Shanghai Jiao Tong University. 33 (1999) 380-382
Li, Theories and Applications of Magnetic Fluid, Science Press ed., Beijing, 2003 [15] C.