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The Effect of Welding Angle for Acoustic Emission Propagation in Offshore Jacket Platform WANG Long1,a, YANG Guoan*2,b, JIA Lele3, JIA Guang4 1,2,3,4School of Mechanical and Electronic Engineering, Beijing University of Chemical Technology, Beijing, China aemail, fengleaf77@126.com, bemail,ygapublic@163.com Keywords: offshore jacket platform; AE; welding angle; propagation characteristic Abstract.
The research result can provide references for engineering application of AE technique to locate the damage source and analyse the failure feature.
So the 90 and 45 degrees welding angle impacting on propagation characteristics of AE is studied in the paper, the research is significant in practical engineering applications of AE testing for offshore platform.
Journal of Offshore Mechanics & Arctic Engineering, 2000, 122(2): 65-71 [2] B.Peeters, J.Maeck, G.De Roeck.
Excitation Sources and Dynamic System Identification in Civil Engineering.

Manufacture and Performance of the Al2O3/Al Compound Powder and Cermet with the Powder Metallurgy Yuening Qin1a*, Yuzhen Wang2b, Hongbin Wen2c, Mengli Qin2d, Dongliang Zhang2e, Fang Wang3f and Jieguang Song4g* 1College of Civil Engineering and Architecture, Guangxi Vocational Normal University, Nanning 530007, China 2Research Institute of Sponge City, Pingxiang University, Pingxiang 337055, Jiangxi, China 3School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, China 4College of Innovation and Entrepreneurship, Pingxiang University, Pingxiang 337055, Jiangxi, China a274023049@qq.com, b3438645793@qq.com, c2842203249@qq.com, dqinmengli71289@126.com, e1542543192@qq.com, faprilfang@163.com, gsjg825@163.com Keywords: Composite powder; Cermet; powder metallurgy; Alumina; Aluminum.
Cermet has the merits of the metal materials, and it shows the outstanding properties of ceramic materials, and it is a very outstanding new engineering material.
In addition to their applications in aerospace and military fields, metal matrix ceramic composites are also gradually being used in civil fields such as metallurgy, machinery, and building materials. applied [4].

Experimental Study on Mechanical Properties of Rock Pile Mingkui Huang 1a,Xiwu Yang2b 1 College of Civil Engineering and Architecture, Chongqing Jiaotong University, 400074, Chongqing, China aemail: hmksmile@163.com; b email: yangxixu@126.com Keywords: rock pile; mechanical property; subgrade; adverse geologic phenomenon Abstract: Rock pile is a typical kind of adverse engineering geologic phenomenon in mountainous engineering construction.
These research results are useful for engineering construction and treatment of rock pile.
Subgrade(handbook of railway engineering design location and track) [M].
Engineering properity and application of coarse grained soil[M].
Chinese Journal of Underground Space and Engineering,2007,3(6): 1104-1108

Simulation Analysis on Mechanics of Large-span Enclosure Steel Structure Used in the Subway Station Wei Wu1, a and Jing Ji2, b 1The Department of Architecture and Engineering Qinhuangdao College, Northeast Petroleum University, Qinhuangdao, Hebei,066004, China 2The College of Architecture and Engineering, Northeast Petroleum University, Daqing, Heilongjiang, 163318, China aQinhuangdaoww2@163.com, bJijing1977@163.com Keywords: Steel Pipe Column, Truss Beam, ANSYS, Modal analysis.
The structure system has the advantages of simple construction and short cycle, so it can provide valuable reference for similar engineering.
The construction speed is fast and short cycle, so the structure system will be widely applied in the actual engineering.
Because the structure system has the advantages of simple construction and short cycle, so it can provide valuable reference for similar engineering.
References [1] GB50023-2003: Code for design of steel structures (China Building Industry Press, China 2003) (In Chinese) [2] Tao Liu and Fengpeng Yang: Proficient in ANSYS (Tsinghua University press, China 2002) (In Chinese) [3] Wenhua Hao: ANSYS Civil Engineering Application Examples (China Water Power Press, China 2005) (In Chinese) [4] GB50023-2003: Design and Analysis of Composite Structures (China Building Industry Press, China 2003) (In Chinese)

., Science and Research Branch, Azad University, Tehran, Iran, 3School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran, 4MGA Structural Engineering.
Journal of Structural Engineering, 130, 895-903
Proceedings of the Institution of Civil Engineers-Structures and Buildings, 1-17 [21] Chancellor, N.
Proceedings of the Institution of Civil Engineers-Structures and Buildings, https://doi.org/10.1680/jstbu.20.00053 [32] Eathertone, M.
Civil Eng.

The research on mean spacing of rock fracture Lu Jiang1,a, Yangsong Zhang2,b Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing, China ajianglu070903@163.com, bzysnj318@126.com *Corresponding author.
The mean spacing of rock fracture can be directly used for rock mass classification in GSI rock systems, and has a great significance in rock engineering studies.
Introduction In the study of stability in geotechnical engineering, the study of engineering rock mechanics parameters is one of the key issues[1]，the rock mass engineering support, stability evaluation and numerical simulation all need a selection of mechanical parameters on rock mass strength, and the choice of parameters plays a vital role which result the accuracy of the calculated[2].
Through the quantitative surrounding rock grading system, it can reduce the reliance on engineering experience and very convenient[4].
Improved empirical determination of strength parameter for jointed rock masses and its application in engineering[J].

Fire risk assessment is an important part of fire science and safety engineering. 1 Introduction Like any other structure, hotels are exposed to the risks of fire, but there are certain aspects that complicate their fire safety systems and plans.
All hotel premises have a different purpose: residential area, administrative and economic, auxiliary premises, engineering and technical premises.
Rykun, Fire safety of hotel complexes, Actual problems of technical and social sciences in ensuring the activities of the civil defense service: Proceedings of the All-Ukrainian scientific-practical conference, (2014) 44
Tryhuba, Determination of the Critical Time of Fire in the Building and Ensure Successful Evacuation of People, Periodica Polytechnica Civil Engineering, 63(1) (2019) 308–316
Ivanusa, Safety-focused Stakeholder Management in Civil Protection Projects, 2019 IEEE 14th International Scientific and Technical Conference on Computer Sciences and Information Technologies (CSIT), (2019) 27–31.

Abstract: The construction organization design is the engineering design of infrastructure projects in the bidding and construction phase of the technical documentation must be submitted.
(2) mechanical construction technology to prepare 3 technical tests of the operating personnel to seriously study the design documents , good mechanical construction technology programs and operations of the water in order to make the construction site of civil and mechanical aspects of the construction of two pilot programs and a comprehensive understanding of the technical quality requirements. 4 subgrade 5 according to design drawings and test data , mostly along the silt soil , fillers difficult to control moisture , CBR value of about 5.8 to 13.4% , which can basically meet the requirements of CBR of roadbed filler , filler try to choose when selecting compaction, water good stability gravel soil , control the water content, ensure subgrade compaction . 6 different packing should be stratified when filling filling , packing each layer should be consistent , prohibited the use of silt, humus , including weeds, roots and other water saturation of wet soil , poor soil permeability
7 fillers used gravel soil test section . 8 of the original pavement leveling, rolling , ensuring sidewalk meet the transport requirements. 1.2 personnel and equipment 1) Construction Organization and Staffing Mr Chan by the Project Manager is responsible for construction management of any person, and equipped with head of technology and technical construction personnel, materials and equipment are equipped with individual responsibility. 2. construction equipment and measurement, test equipment with the situation Organization digging equipment, transportation, paving, compaction machinery and equipment, approach, and mechanical installation and commissioning 3. test section construction process 3.1 Embankment press the "three-stage, four-section, eight processes," the construction process organization of construction. 3.2 Preparation before filling ① roadbed construction before been carried out on the original ground before filling rolled and inspected by the supervising engineer
B, each rolling start , the test engineer from the rolling start every fourth time tested once again rolling compaction .

Review and suggestions related to disease prevention and water quality improvement in Xinjiang rural areas, China Qiao Li 1, a, Jinlong Zhou 1,2,b ,Chunyan Bai1,c and Yuyuan Ji 1,d 1College of Water Conservancy and Civil Engineering ,Xinjiang Agricultural University Urumqi,P.R.China 2School of Environmental Science ,China University of Geosciences ,Wuhan, P.R.China a262384604@qq.com, bzjzhoujl@163.com, c809532809@qq.com,d119339607@qq.com Keywords: waterborne diseases; disease prevention and water quality improvement in rural areas; Xinjiang Abstract.
Over a long period of time, industrial wastewater, civil wastewater and agricultural alkaline water discharged from the upper reaches seriously contaminated the surface water and groundwater of this district, resulting in excessively high content of SO42- and Mg2+ in drinking water.

Noise Prediction for Multi-Element Airfoil Based on FW-H Equation Tao Jun1,a, Sun Gang1,b, Hu Ying1,c, Zhang Miao2,d 1Mechanics and Engineering Science Dep., Fudan Univ., Shanghai 200433, China 2Shanghai Aircraft Design And Research Institute, Shanghai 200232, China a09110290003@fudan.edu.cn, bgang_sun@fudan.edu.cn, c10210290007@fudan.edu.cn, dzhangmiao@comac.cc Key words: multi-element airfoil; N-S equations; acoustic analogy; FW-H equation Abstract.
Introduction Civil aircraft noise prediction is the main area of aeroacoustics research.
High lift device is an important aerodynamic noise source of civil aircraft and an integral part of the airframe noise.