American Journal of Scientific Research and Essays


Experimental study on scouring of coarse sand and fine sand seabed caused by propeller washing in front of solid wharf

Research article of American Journal of Scientific Research and Essays Experimental study on scouring of coarse sand and fine sand seabed caused by propeller washing in front of solid wharf Shuo Zhang College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China This paper presents the results of continuous scouring and intermittent scouring tests on two kinds of seabed soils (d50=0.7mm coarse sand and d50=0.162mm fine sand) induced by propeller washing at the front of the solid wharf. Three propellers with diameters of 70 mm, 130 mm and 150 mm were used for the test. The test results show that under the same test conditions, the maximum scouring depth of the coarse sand seabed is 8.2% to 58% deeper than that of the fine sand seabed under continuous test or intermittent scouring; compared with continuous scouring, intermittent scouring The maximum scouring depth increase caused by the coarse sand seabed is 2% to 4.8%, while it is increased to 5.1% to 37% for the fine sand seabed. The prediction formula of the maximum equilibrium scouring depth on the fine sand seabed caused by the front edge of the solid wharf during the intermittent washing of the propeller is established. This formula is a dimensionless formula, which can be applied to the intermittent scouring of the actual propeller wash. Keywords: propeller washing; continuous scouring; intermittent scouring; solid wharf; coarse sand; fine sand ...

Numerical simulation and analysis of coupled Thermal-Hydrological-Mechanical in coalbed methane heating mining

Research article of American Journal of Scientific Research and Essays Numerical simulation and analysis of coupled Thermal-Hydrological-Mechanical in coalbed methane heating mining Zhang Bo1, Xie Xionggang1,2 1Guizhou University, Guiyang 550025, China; 2Key Laboratory of Mineral Resources and High Efficiency in Karst Region, Guiyang 550025, China In order to verify the effect of heating on the effect of coal seam extraction,based on the theory of elasticity, seepage mechanics and heat transfer,a Thermal-Hydrological-Mechanical coupling model for gas extraction in high temperature field is established.The numerical simulation was carried out in the engineering background of Qinghe coal mine in China.The changes situation of gas pressure and permeability under the conditions of different heating temperature were calculated respectively.The following conclusions are drawn:(1) The coupled thermo-hydro-mechanical model of gas drainage under temperature field is established, and the gas drainage effect under different working conditions is verified by numerical simulation.(2)When the heating temperature is below 453K, the high temperature can increase the permeability of coal seam,but it can not greatly increase the permeability of coal seam, and it has little effect on the reduction of coal seam gas pressure. It shows that the method of increasing coal seam permeability by heating coal can not reach the expected effect. Keywords: coalbed methane; high temperature field; thermal fluid solid coupling; heating mining; permeability; numerical simulation ...

Research Status of Purification Process of Eutrophicated Water

Review article of American Journal of Scientific Research and Essays Research Status of Purification Process of Eutrophicated Water Lingbing Wu , Anchao Geng, Ying Wang, Bo Wang, Xuan Li College of Ocean Science and Engineering, Shanghai Martime University,Shanghai 201306, China There are widespread eutrophication problems in lakes and rivers in China. Eutrophication means that the water body receives too much nutrients such as nitrogen and phosphorus, and the organic matter is excessive. When the algae dies, it rots, causing the water quality to deteriorate, thereby causing damage and destruction of the ecological functions of the water, bringing huge use of water resources. loss. While a considerable number of countries or regions use lakes, rivers, etc. as drinking water sources, the problems caused by eutrophication cannot be ignored, and it is urgent to find a reliable and effective method to provide safe water supply. The combination process with ultrafiltration as the core removes algae and has good effects, low energy consumption, simple process and easy control, and has broad application prospects in the future water treatment industry. However, the problem of membrane fouling is still seriously hindering the further development of membrane technology in the water treatment industry. Keywords: Eutrophication Ultrafiltration technology Algae removal Ultrafiltration combined process ...

Risk Perception and Evaluation of Supervision: A Study on Chinese Consumer Trust in Food Safety

Research article of American Journal of Scientific Research and Essays Risk Perception and Evaluation of Supervision: A Study on Chinese Consumer Trust in Food Safety Lei Zhang School of Journalism and Communication, Jinan University, Guangzhou 510632, China Food safety has always been the focus of attention from all walks of life as it has been treated as one of the important indicators of the development of a country, concerning national health, industrial security and social stability. On the basis of empirical data, this study analyzed consumer trust in food safety from the perspective of consumers’ risk perception, consumer behavior and food safety regulation. It is found that consumers’ trust in food safety in China is not optimistic and governance of food safety remains to be improved. Keywords: Risk Perception and Evaluation of Supervision,Chinese Consumer Trust , Food Safety ...

Prof. Dr. Mohammad Mehdi Rashidi
Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management, Systems, Tongji Clean Energy Institute of advanced studies- Tongji University.

Dr. Milena Palczewska
Vice Dean for student affairs, Military Faculty, War Studies University, al. gen. Antoniego Chruściela “Montera” 10300-910 Warszawa

Dr. Piyush Chaudhary
Assistant Professor, Deptt of Ras Shastra (Ayurvedic Pharmaceutics), Incharge, Gurukul Pharmacy, MSM Institute of Ayurveda, BPS Women University, Khanpur Kalan, Sonepat, Haryana

Dr. M. M. Awad
Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt

Dr.Eng. Ahmed Kadhim Hussein
College of Engineering, Department of Mechanical Engineering, Babylon University, Babylon City, HIILA , IRAQ

Dr. KATSURA Hidemitsu 
Guest Lecturer for ICEEE-2016, Coimbatore Institute of Technology (CIT) in COIMBATORE, TAMIL NADU 641014, INDIA

Dr. Sang-Bing Tsai
Prof., School of Business, Dalian University of Technology, Panjin, 124221, China; Prof., Zhongshan Institute, University of Electronic Science and Technology of China; Prof., TEDA College, Nankai University, China

Dr. Deepmala 
Visiting Scientist, SQC & OR Unit, Indian Statistical Institute

Dr. Begum Sertyesilisik
Assoc. Prof. at the Istanbul Technical University

Dr. Palani Elumalai
National Research Foundation Fellow of Korea, Department of Chemistry & Biology, University of Ulsan

Dr. Shittu Lukeman Adelaja Joseph
HOUSTON, TX. 77099, USA

Prof. Dr. Naqib Ullah Khan
Department of Plant Breeding and Genetics, The University of Agriculture, Peshawar 25130, Khyber Pakhtunkhwa, PAKISTAN.

Dr. V. Ananthaswamy
Assistant Professor, The Madura College (Autonomous), Madurai – 625 011, Tamil Nadu, India.

Prof. Dr. M.Nageeb Rashed
Professor of Analytical and Environmental Chemistry, Faculty of Science, Aswan University, Egypt

Dr. Hossein Kazemian
Faculty& Director; Northern Analytical Lab Services (NALS), University of Northern British Columbia (UNBC), 3333 University Way, Prince George, BC, Canada, V2N 4Z9

Dr. Vishnu Narayan Mishra
Applied Mathematics and Humanities Department, Sardar Vallabhbhai National Institute of Technology.

Dr. Balaram Kundu
Associate Professor, Department of Mechanical Engineering, Jadavpur University, Kolkata – 700 032, INDIA

Dr. Sergio Nardini
Associate Professor, Dipartimento di Ingegneria Industriale e dell’Informazione, Seconda Università degli Studi di Napoli, via Roma 29, 81031 Aversa (CE)

Dr. Sanjay Mishra
Professor, Department of Biotechnology, School of Engineering & Technology, IFTM University

Dr. Lakshmi Narayan Mishra
Professor, Department of Mathematics, National Institute of Technology

Dr. DHANANJAYA REDDY
Dept.of Mathematics, Assistant Professor In Mathematics, Govt. Degree & PG College

Dr. S. Krishna Murthy
Associate Professor, Department of Applied Mathematics,Defence Institute of Advanced Technology, Deemed University(DU), Girinagar, Pune

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1. Shuo Zhang. Experimental study on scouring of coarse sand and fine sand seabed caused by propeller washing in front of solid wharf.American Journal of Scientific Research and Essays, 2018 3:14. DOI:10.28933/ajsre-2018-12-1805 
2.Zhang Bo and Xie Xionggang. Numerical simulation and analysis of coupled Thermal-Hydrological-Mechanical in coalbed methane heating mining. American Journal of Scientific Research and Essays, 2018 3:13. DOI:10.28933/ajsre-2018-12-0808 

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