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Numerical and Experimental Study on Contact Face and Shock Wave Motion in the Receiving Tube of Gas Wave Refrigerator

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Journal of Thermal Science 2006年第4期15卷 337-341页

作者： Dapeng HU shengtao chen Hu LIU Zuzhi chen Che ZHU Institute of Chemical Engineering Dalian University of Technology Dalian Liaoning China

The contact face and shock wave motion in an open ends receiving tube of gas wave refrigerator are investigated numerically and experimentally. The results show that, velocity of the contact face rises rapidly as gas is injected into the receiving tube, and drops sharply after a steady propagation. However, velocity of the shock wave in the tube is almost linear. With increasing of inlet pressure, velocity of the shock wave and steady velocity of contact face also increase. In addition, time and distance of contact face propagation in the receiving tube become longer.

关键词： contact face shock wave receiving tube gas wave refrigerator

Study on gas and wave in a receiving tube

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Journal of Thermal Science 2008年第2期17卷 170-174页

作者： Dapeng Hu shengtao chen Jun Yang Zuzhi chen Yuqiang Dai Che Zhu Runjie Liu Institute of Chemical Engineering Dalian University of Technology Dalian Liaoning China

The gas and wave＇s motion in a receiving tube are investigated numerically and experimentally in the present paper. The results show that, velocity of the contact face rises rapidly as gas is injected into the receiving tube, and then drops sharply after a steady propagation. However, velocity of the wave in the tube is almost linear and the wave can be reflected at the close end of the receiving tube. With increasing of inlet pressure, velocity of the wave and steady velocity of contact face also increase. There is obvious thermal effect as the wave sweeps the gas. The reflected wave can heat the exhausting gas in the open end. As an absorber, an expander and a shrink in the robe can almost completely absorb the reflected wave.

关键词： contact face wave receiving tube absorber

Using radium isotopes to quantify submarine groundwater discharge at different scales in the Huanghe River Estuary,China

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Acta Oceanologica Sinica 2023年第8期42卷 32-39页

作者： Haowei Xu Disong Yang Xiaoyi Guo Maosheng Gao Guangquan chen Diansheng Ji shengtao chen Huaming Yu Bochao Xu Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education Ocean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China North China Sea Environmental Monitoring Center of State Oceanic Administration/Key Laboratory of Ecological Prewarning and Protection of Bohai Sea Ministry of Natural ResourcesQingdao 266033China Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation Qingdao 266033China Qingdao Institute of Marine Geology Qingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Yantai Marine Center Ministry of Natural ResourcesYantai 264003China North China Sea Ecological Center Ministry of Natural ResourcesQingdao 266033China Key Laboratory of Ecological Prewarning and Protection of Bohai Sea Ministry of Natural ResourcesQingdao 266033China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Sanya Oceanographic Institution Ocean University of ChinaSanya 572000China

As an important land-ocean interaction process,submarine groundwater discharge(SGD)is composed of multiple dynamical processes at different scales and plays an important role in the study of coastal ocean geochemical ***,most of the existing studies focus on the quantification of the total groundwater discharge,few studies are about the differentiation and quantification of groundwater discharge processes at different scales(i.e.,short-scale SGD and long-scale SGD).As a world-class river,the Huanghe River is highly turbid and heavily regulated by *** natural and anthropogenic factors have a significant impact on groundwater discharge processes in the Huanghe River Estuary(HRE).In this study,the distribution patterns of the natural geochemical tracer radium isotopes(^(224)Ra and^(223)Ra)and other hydrological parameters in the HRE were investigated during four *** solving the mass balance of^(224)Ra and^(223)Ra in the HRE,the long-scale SGD flux was quantified as 0.01−0.19 m/d,and the short-scale SGD flux was 0.03−0.04 m/*** rate of short-scale SGD remained essentially constant among seasons,while the rate of long-scale SGD varied considerably at different periods and showed a synchronous trend with the variation of river *** results of this study are significant for understanding the SGD dynamics in the HRE and the contribution of SGD to the ocean geochemical budgets.

关键词： radium isotopes submarine groundwater discharge Huanghe River Estuary

The Thermal Character of the Underwater Heat Exhausting Source

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Journal of Thermal Science 2010年第5期19卷 445-450页

作者： shengtao chen,Huanying Liu and Yi Qi Science and Technology on Underwater Test and Control Laboratory,PO Box 67,Dalian,Liaoning 116013 Science and Technology on Underwater Test and Control Laboratory Dalian Liaoning China

The underwater heat exhausting source can cause the thermal difference of the surrounding and surface *** this paper,the thermal character caused by the underwater heat exhausting source is studied by numerical simulation and *** results show that the thermal floating distance is related with the sailing velocity of the underwater *** higher the velocity is,the longer the hot wake is,and the broader the hot scope *** relative distance of the thermal floating spot is almost in a logarithmic law with the *** experimental results are accordant with the numerical simulation,and the obvious hot wake can be observed by the moving underwater heat exhausting source testing with temperature sensors and infrared camera.

关键词： heat exhausting hot wake thermal character underwater target

ILIDViz:An incremental learning-based visual analysis system for network anomaly detection

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Virtual Reality & Intelligent Hardware 2023年第6期5卷 471-489页

作者： Xuefei TIAN Zhiyuan WU Junxiang CAO shengtao chen Xiaoju DONG Department of Computer Science Shanghai Jiao Tong UniversityShanghai 201100China

Background With the development of information technology,there is a significant increase in the number of network traffic logs mixed with various types of *** intrusion detection systems(IDSs)are limited in detecting new inconstant patterns and identifying malicious traffic traces in real ***,there is an urgent need to implement more effective intrusion detection technologies to protect computer *** In this study,we designed a hybrid IDS by combining our incremental learning model(KANSOINN)and active learning to learn new log patterns and detect various network anomalies in real *** Experimental results on the NSLKDD dataset showed that KAN-SOINN can be continuously improved and effectively detect malicious ***,comparative experiments proved that using a hybrid query strategy in active learning can improve the model learning efficiency.

关键词： Intrusion detection Machine learning Incremental learning Active learning Visual analysis

Demonstration of Orbital-Angular-Momentum-Based Optical Switching Using Dual-Area Mirrors

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Optics and Photonics Journal 2021年第8期11卷 351-359页

作者： shengtao chen Xizheng Ke Xi’an University of Technology School of Automation and Information Engineering Xi’an China Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks Xi’an China

We have designed an optical separation device called dual-area mirror for the data link of orbital angular momentum (OAM) multiplexing. Experiments show that the OAM multiplexed beams can be switched by using dual-area mirrors, using OOK to modulate four channels separately to form two inputs, channel A and channel B. There are two OAM beams that are multiplexed in each of channel A and channel B, using a spatial light modulator (SLM) to convert the OAM multiplexed beams in each channel. One of the beams is converted into a Gaussian beam, and then separated by a dual-area mirror, so as to realize the switch of a beam carrying different data in the two channels. Then these channels are detected. The waveform indicates that the switch is successful, and the measured optical power indicates that the dual-area mirror can reduce the bit error rate in the communication links. In addition, the device reduces the experimental cost, is easy to implement, is easy to integrate, and increases the angle between the separated beams.

关键词： Optical Communication Dual-Area Mirror Switching Optical Network

Numerical Simulation of the Stokes Wave for the Flow around a Ship Hull Coupled with the VOF Model

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Journal of Marine Science and Application 2015年第2期14卷 163-168页

作者： shengtao chen Jingjun Zhong Peng Sun Marine Engineering College Dalian Maritime University Dalian 116026 China

The surface wave generated by flow around a ship hull moving near free surface of water is simulated numerically in this study. The three-dimensional implicit finite volume method （FVM） is applied to solve Reynolds averaged Navier-Stokes （RANS） equation. The realizable k-e turbulence model has been implemented to capture turbulent flow around the ship hull in the free surface zone. The volume of fluid （VOF） method coupled with the Stokes wave theory has been used to determine the free surface effect of water. By using is a six degrees of freedom model, the ship hull＇s movement is numerically solved with the Stokes wave together. Under the action of Stokes waves on the sea, the interface between the air and water waves at the same regular pattem and so does the pressure and the vertical velocity. The ship hull moves in the same way as the wave. The amplitude of the ship hull＇s heave is less than the wave height because of the viscosity damping. This method could provide an important reference for the study of ships＇ movement, wave and hydrodynamics.

关键词： phase flow Stokes wave ship hull numerical tank freesurface wave artifical beach volume of fluid (VOF) finite volumemethod (FVM)

Numerical Simulations on Geometrical Properties of Wall-attaching Transonic Jet

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Engineering Sciences 2008年第1期6卷 38-42页

作者： Hu Dapeng chen Zuzhi Dai Yuqiang chen shengtao Gas Wave Refrigeration Research and Popularization Center of Dalian University of Technology Dalian 116012 China

Effects of operating conditions and device's geometrical sizes on geometrical properties of wall-attaching transonic jet between two parallel plat plates are numerically simulated. Conclusions are as follows: 1) Upriver part of the wall-attaching jet's center streamline is in good accordance with parabola; 2) When both gas inlet pressure and outlet pressure as well as their ratio are not too high ( the outlet pressure is less than 10 MPa and the pressure ratio is less than 3), the center streamlines of the wall-attaching jet with the same pressure ratio coincide with each other very well, and the deflection degree of the center streamline decreases with rise of the pressure ratio; 3) The deflection degree of the jet's center streamline decreases with either broadening of nozzle's throat or rise of wall offset; 4) With rise of the pressure ratio, attachment distance of the jet increases, but the increase rate descends; 5) The attachment distance ascends with rise of either the nozzle's throat or the wall offset.

关键词： wall-attaching transonic jet parallel plat plates geometrical properties attachment distance

Insights from coastline survey in Shandong Province,China

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Global Geology 2022年第2期25卷 126-132页

作者： XIU Chun HUO Suxia WANG Guogang DUAN Haiqin chen shengtao YAO Haiyan North China Sea Environmental Monitoring Center SOAQingdao 266033ShandongChina Key Laboratory of Ecological Prewarning Protection and Restoration of Bohai SeaMinistry of Natural ResourcesQingdao 266033ShandongChina Shandong Provincial Oceanic and Fishery Law Enforcement and Supervision Bureau Jinan 250002China

The coastline,as the boundary between land and sea,is shaped by both natural factors and human *** on concrete practice from coastline survey in Shandong Province,this study discusses the applicability of the local standard Specification for Coastline Survey(DB 37/T 3588-2019).The coastline classification system takes into account the coastline characteristics and marine management requirements in Shandong *** be specific,the coastline with natural beach morphology and ecological function is involved,and its delimitation method is *** coastline delimitation of sandy beach,aquaculture pond and salt pan follows the trace line of the mean high water springs(MHWS),but the coastline location of sandy beach can also be at the base of cliffs or at the foot of seawalls and roads considering the dynamic changes of the beach in different seasons and the integrity of the beach *** delineation of estuarial coastline is to achieve the complete coastline,and should not be used for the statistics of natural coastline retention *** present,the review of survey results has been *** the promulgation of survey results next,the formulation of relevant mechanisms and policies should promptly be put on the agenda,including regular investigation and data updating,natural coastline assessment,natural coastline requisition-compensation,and coastline protection planning.

关键词： coastline classification survey specification natural coastline retention rate coastline protection