检索结果-南通市图书馆

The rediscovery of Strix butleri(Hume,1878)in Oman and Iran,with molecular resolution of the identity of Strix omanensis Robb,van den Berg and Constantine,2013

在线全文

学校读者我要写书评

暂无评论

Chinese Birds 2016年第2期7卷 85-94页

作者： Magnus S.Robb George Sangster Mansour Aliabadian Arnoud B.van den Berg Mark Constantine Martin Irestedt Ali Khani Seyed Babak Musavi Joao M.G.Nunes Maia Sarrouf Willson Alyn J.Walsh the sound approach Department of Bioinformatics and Genetics Swedish Museum of Natural History Department of Zoology Stockholm University Department of Biology Faculty of ScienceFerdowsi University of Mashhad Research Department of Zoological Innovations Institute of Applied ZoologyFaculty of ScienceFerdowsi University of Mashhad Khorasan-e Razavi Provincial Office of the Department of the Environment Khucheh Gochin Parque Ecológico do Funchal Environment Society of Oman Wildfowl Reserve

Background:Many species of owls(Strigidae) represent cryptic species and their taxonomic study is in *** recent years,two new species of owls of the genus Strix have been described from the Middle East by different research *** has been suggested that one of these species,***,is not a valid species but taxonomic compari?sons have been hampered by the lack of voucher specimens of ***,and the poor state of the holotype of ***:Here we use new DNA sequence data to clarify the taxonomy and nomenclature of the *** *** also report the capture of a single *** sensu stricto in Mashhad,***:A cytochrome b sequence of *** was found to be identical to that of the holotype of ***,indicating that the name *** is best regarded as a junior synonym of *** identity of the *** captured in Mashhad,Iran,was confirmed using DNA sequence *** represents a major(1300 km) range exten?sion of this ***:The population discovered in Oman in 2013 and originally named ‘***' actually represents the rediscovery of ***,which was known from a single specimen and had not been recorded since *** range of *** extends into northeast *** study augments the body of evidence for the recognition of *** and *** as separate species and highlights the importance of using multiple evidence to study cryptic owl species.

关键词： Molecular identification Nomenclature Phylogenetics Strigidae Strix Taxonomy

Data-driven and Model-based Hybrid Reinforcement Learning to Reduce Stress on Power Systems Branches

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2021年第3期7卷 433-442页

作者： Mariana Kamel Renchang Dai Yawei Wang Fangxing Li Guangyi Liu The University of Tennessee.Knoxville TNUSA Puget sound Energy BellevueWAUSA PayPal San JoseCAUSA Envision Digital.Redwood City CAUSA

This work proposes a reinforcement learning(RL)approach to tackle the control problem of branch overload relief in large power ***,a control agent is trained to change generators'real power output in order to relieve the stressed *** large power systems,this control problem becomes one whose decision space(i.e.,the action space)is both highly-dimensioned and *** makes it extremely difficult to have successful training for RL-based *** improve the effectiveness,a data-driven and model-based hybrid approach is proposed to optimize the control by combining RL-agent actions and generator shifting factor-driven ***,with the proposed approach the RL-agent successfully trains on large power *** proposed design is tested on both the IEEE 118-bus testing system and a 2749-bus real *** obtained results show that the proposed hybrid approach outperforms the data-driven training approach.

关键词： Deep deterministic policy gradient generation re-dispatch hybrid learning overload relief reinforcement learning

Equivalent source method for identification of panel acoustic contribution in irregular enclosed sound field

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 2015年第1期34卷 49-66页

作者： XIAO Yue CHEN Jian HU Dingyu JIANG Fengxin Institute of sound and Vibration Research Hefei University of Technology College of Mechanical and Electrical Engineering Nanchang Institute of Technology

For the interior sound field formed by the complex vibrating structure, an identifi- cation approach of panel acoustic contribution based on equivalent source method （ESM） was presented. The normal velocity on the surface of vibrating structure was first reconstructed by using interior nearfield acoustic holography based on ESM and the prediction of whole interior enclosed sound field was realized. Then the sound pressure produced by each panel at the interested field point was respectively replaced by the radiated pressure of the enclosed interior sound field which is formed by the equivalent virtual sources located near the surface of the cav- ity. Combining with the reconstructed normal surface velocity, the acoustic contribution of each panel to any position in the cavity was obtained by transforming the complex enclosed non-free field into the simple interior free field. Numerical simulations and experiments are conducted, and the influences of the number of the equivalent sources and the distance between them and the reconstructed surface have been investigated. The results show that the proposed method is easier to be implemented with the same accuracy than the traditional analysis method.

关键词： Equivalent source method for identification of panel acoustic contribution in irregular enclosed sound field

H_∞ Autopilot Design for Autonomous Underwater Vehicles

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2010年第2期15卷 194-198页

作者：冯正平 R. ALLEN School of Naval Architecture Ocean and Civil EngineeringShanghai Jiaotong University Institute of sound and Vibration Research University of SouthamptonSouthampton SO17 1BJUnited Kingdom

The design approach of H∞ autopilot for autonomous underwater vehicles (AUVs) is proposed. Comprised by the three sub-controllers,i.e. speed,heading and depth controllers,the designed autopilot has advantage over existing H∞ control of AUVs. The overshoot in speed,heading and depth control systems under step commands is restricted by refining the weighting function for robust stability. The dynamic performance of heading and depth control systems is improved by feeding back yaw rate and pitch angle,respectively. To evaluate the design approach,it is then utilized to synthesize the autopilot for flight control of Subzero Ⅲ,a low cost test-bed for AUV control techniques. Both simulations and water trails verify the effectiveness of the design approach.

关键词： autonomous underwater vehicle (AUV) autopilot H∞ control weighting function

Planar near-field acoustical holography based on equivalent source method and its experimental investigation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 2008年第3期27卷 250-260页

作者： ZHANG Yongbin CHEN Xinzhao BI Chuanxing CHEN Jian Institute of sound and Vibration Research Hefei University of Technology Hefei 230009

The current main approach to reconstruct and predict the acoustic field of a planar source is Near-field Acoustical Holography （NAH） based on FFT. But this method has some disadvantages such as wraparound error and edge Gibbs phenomena which will contaminate the results badly. A planar NAH based on equivalent source approach is developed, which has no wraparound error and edge Gibbs phenomena, and it is beneficial for engineering application. The experimental results of acoustic radiation generated by a point-driven plate with clamped boundaries validate the correctness and availability of the method.

关键词： experimental investigation engineering application acoustic radiation equivalent source acoustic field

Reconstruction and prediction of coherent acoustic field with the combined wave superposition approach

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 2006年第2期25卷 124-138页

作者： LI Weibing CHEN Jian YU Fei CHEN Xinzhao Institute of sound and vibration research Hefei University of Technology Hefei 230009

The routine wave superposition approach cannot be used in reconstruction and prediction of a coherent acoustic field, because it is impossible to separate the pressures generated by individual sources. According to the superposition theory of the coherent acoustic field , a novel method based on the combined wave superposition approach is developed to reconstruct and predict the coherent acoustic field by building the combined pressure matching matrixes between the hologram surfaces and the sources. The method can reconstruct the acoustic information on surfaces of the individual sources, and it is possible to predict the acoustic field radiated from every source and the total coherent acoustic field can also be calculated spontaneously. The experimental and numerical simulation results show that this method can effectively solve the holographic reconstruction and prediction of the coherent acoustic field and it can also be used as a coherent acoustic field separation technique. The study on this novel method extends the application scope of the acoustic holography technique.

关键词： wave superposition acoustic field holographic reconstruction separation technique acoustic holography simulation results application scope used in

Numerical Simulation for Remediation Planning for 1,4-Dioxane-Contaminated Groundwater at Kuwana Illegal Dumping Site in Japan Based on the Concept of Verified Follow Up

在线全文

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2013年第7期5卷 699-708页

作者： Ramrav Hem Toru Furuichi Kazuei Ishii Yu-Chi Weng Laboratory of sound Material-Cycle Systems Planning Graduate School of Engineering Hokkaido University Sapporo Japan

At Kuwana illegal dumping site in Japan, where hazardous waste was illegally dumped, groundwater was severely contaminated by Volatile Organic Compounds (VOCs). Groundwater was already remedied by conducting Pump-and-Treat (P&T) after containment of all the waste by vertical slurry walls from 2002 to 2007. However, 1,4-dioxane was detected in both waste and groundwater outside of slurry walls after it was newly added into Japan environmental standards in late 2009, which suggested that the walls did not contain 1,4-dioxane completely. Our previous study developed a model to predict the 1,4-dioxane distribution in groundwater after the previous remediation at the site. In this study, numerical simulation was applied for remediation planning at the site based on the concept of Verified Follow Up (VF-UP) that had been proposed as a new approach to complete remediation effectively with consideration of future risks. The amount of waste to be removed and pumping plans were discussed by numerical simulation to achieve the remedial objective in which 1,4-dioxane in groundwater outside of walls is remedied within 10 years and 1,4-dioxane spreading throughout the walls is prevented in the case where a portion of waste is remained. Firstly, the amount of waste to be removed considering pumping plans for P&T was determined by scenario analysis. As a result, at least two-third of waste should be removed by combining with P&T. However, if the waste is remained, future risks of 1,4-dioxane spreading through the slurry walls may occur. Our simulation suggested that groundwater within the remaining waste must be pumped up at least 20 m3/d for containment of 1,4-dioxane within the remaining waste. In conclusion, our numerical simulation determined the amount of waste to be removed and the pumping plans for P&T to achieve the remedial objective effectively considering future risks based on the concept of VF-UP.

关键词： Remediation Planning Numerical Simulation Verified Follow Up Pump-and-Treat 1 4-Dioxane-Contaminated Groundwater Illegal Dumping Site

Healing Wounds under Mechanical Stress: A Case Example

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Clinical Medicine 2016年第2期7卷 120-126页

作者： Jennifer D. Hastings Sara Shapiro University of Puget sound School of Physical Therapy Tacoma WA USA Apex Health Solutions Tacoma WA USA

This paper challenges the concept that the essential element in wound healing is to offload pressure. We suggest a change in approach that recognizes the integumentary system as one which, like all other body systems, adapts to the stresses put upon it. We use a clinical case example to illustrate the use of intentional mechanical stress to promote wound healing and include a review of the relevant literature. The intent of this publication is to call for a new look at clinical practice regarding wound healing and to call for future research directed at investigation of this theory.

关键词： Wounds Pressure Ulcer Mechanical Stress Electric Stimulation Weight-Bearing

On high-performance rotational energy harvesting with a novel cam-like dielectric elastomer generator

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第5期66卷 1317-1334页

作者： FANG ShiTong WANG ShuaiBo ZHANG GuoQing WANG Chen XU JunChen WANG ZhouZhou FENG AiJie QIAO ZiJian YURCHENKO Daniil LAI ZhiHui Shenzhen Key Laboratory of High-Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China School of Mechanical Engineering and Mechanics Ningbo UniversityNingbo315211China Institute sound and Vibration Research University of SouthamptonSouthamptonSO171BJUK

Rotational energy is a type of common energy source that can be harvested for supplying low-powered electronic *** paper proposes and investigates a novel cam-like dielectric elastomer generator(CDEG)for high-performance rotational energy harvesting.A mushroom-head clamp is designed to form a type of advanced conical dielectric elastomer membranes(DEMs).Moreover,a type of multi-protrusion cam mechanism is designed in the CDEG to effectively convert any external rotational excitation into a linear reciprocating motion,which can be further converted into electricity through the ***,the operating principle of the system under external rotational excitation is analyzed theoretically by deducing the deformation condition of the DEMs and the electrical output of the ***,the prototype is fabricated,and the rotational-to-linear motion conversion rule of its cam-like mechanism and the DEM capacitance calculation approach are *** experimental results show that adequate charging time and discharging time of the DEMs,which can be realized through the proposed cam-like mechanisms,are beneficial to the energy harvesting(EH)performance of the ***,with the validated theoretical model,numerical simulations are conducted to further study the system dynamics and the influences of important system parameters on the EH performance to provide a guideline for system ***,the genetic algorithm is adopted to obtain the optimal system parameters and the corresponding electrical output of the proposed CDEG,demonstrating its superior output power at ultralow rotational frequencies compared with other typical rotational energy harvesters in the literature.

关键词： rotational energy harvesting dielectric elastomer generator cam-like mechanism rotational-to-linear conversion theoretical model