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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Tan Wen Yuanfang Wen Xiaowu Zhang Xingming Bian College of electrical and electronics engineering Huazhong university of science and technology Wuhan Hubei Province China State grid electric power research institute Wuhan Hubei Province China Department of electrical engineering Tsinghua University Beijing China

The importance and recent achievements in the field of noise control of power transformer are expounded in this paper. Oscillation is presented as the reason for the transformer and cooling system noise. The methods used in transformer noise research are summed up. Generally speaking, far-field radicalization noise can be analyzed by summing up statistic data and setting calculating model, and sound intensity method is more accurate in measuring noise level of a transformer compared with traditional sound pressure method. The measures for controlling the transformer noise are introduced in detail. High-quality silicon-steel is suggested to be used, as well as adopting some effective measures when design, machining and install transformers. Assuasive equipments, muffler, sound insulation board and isolation booth, which will result attenuation in noise transmission, are proposed in order to reducing noise. Lastly but not the least important, opinions on the trend of the transformer noise control are bring forward.

关键词： Power transformers Acoustic noise Power transformer insulation Noise level Noise measurement Noise reduction Cooling Statistical analysis Power system modeling Pressure measurement

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Two-pion Bose-Einstein correlations in pp collisions at s=900 GeV

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Physical Review D 2010年第5期82卷 052001-052001页

作者： K. Aamodt N. Abel U. Abeysekara A. Abrahantes Quintana A. Abramyan D. Adamová M. M. Aggarwal G. Aglieri Rinella A. G. Agocs S. Aguilar Salazar Z. Ahammed A. Ahmad N. Ahmad S. U. Ahn R. Akimoto A. Akindinov D. Aleksandrov B. Alessandro R. Alfaro Molina A. Alici E. Almaráz Aviña J. Alme T. Alt V. Altini S. Altinpinar C. Andrei A. Andronic G. Anelli V. Angelov C. Anson T. Antičić F. Antinori S. Antinori K. Antipin D. Antończyk P. Antonioli A. Anzo L. Aphecetche H. Appelshäuser S. Arcelli R. Arceo A. Arend N. Armesto R. Arnaldi T. Aronsson I. C. Arsene A. Asryan A. Augustinus R. Averbeck T. C. Awes J. Äystö M. D. Azmi S. Bablok M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri A. Baldit J. Bán R. Barbera G. G. Barnaföldi L. S. Barnby V. Barret J. Bartke F. Barile M. Basile V. Basmanov N. Bastid B. Bathen G. Batigne B. Batyunya C. Baumann I. G. Bearden B. Becker I. Belikov R. Bellwied E. Belmont-Moreno A. Belogianni L. Benhabib S. Beole I. Berceanu A. Bercuci E. Berdermann Y. Berdnikov L. Betev A. Bhasin A. K. Bhati L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic L. Bimbot E. Biolcati A. Blanc F. Blanco D. Blau C. Blume M. Boccioli N. Bock A. Bogdanov H. Bøggild M. Bogolyubsky J. Bohm L. Boldizsár M. Bombara C. Bombonati M. Bondila H. Borel A. Borisov C. Bortolin S. Bose L. Bosisio F. Bossú M. Botje S. Böttger G. Bourdaud B. Boyer M. Braun P. Braun-Munzinger L. Bravina M. Bregant T. Breitner G. Bruckner R. Brun E. Bruna G. E. Bruno D. Budnikov H. Buesching P. Buncic O. Busch Z. Buthelezi D. Caffarri X. Cai H. Caines E. Calvo E. Camacho P. Camerini M. Campbell V. Canoa Roman G. P. Capitani G. Cara Romeo F. Carena W. Carena F. Carminati A. Casanova Díaz M. Caselle J. Castillo Castellanos J. F. Castillo Hernandez V. Catanescu E. Cattaruzza C. Cavicchioli P. Cerello V. Chambert B. Chang S. Chapeland A. Charpy J. L. Charvet S. Chattopadhyay M. Cherney C. Cheshkov B. Cheynis E. Chiavassa V. Chibante Barroso D. D. Chinellato P. Chochula K. Choi M. Chojnacki P. Christakoglou C Department of Physics University of Oslo Oslo Norway Kirchhoff-Institut für Physik Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Physics Department Creighton University Omaha Nebraska USA Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN) Havana Cuba Yerevan Physics Institute Yerevan Armenia Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland KFKI Research Institute for Particle and Nuclear Physics Hungarian Academy of Sciences Budapest Hungary Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India Gangneung-Wonju National University Gangneung South Korea University of Tokyo Tokyo Japan Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia Sezione INFN Turin Italy Dipartimento di Fisica dell’Università and Sezione INFN Bologna Italy Department of Physics and Technology University of Bergen Bergen Norway Dipartimento Interateneo di Fisica ‘M. Merlin’ andSezione INFN Bari Italy Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany National Institute for Physics and Nuclear Engineering Bucharest Romania Department of Physics The Ohio State University Columbus Ohio USA Rudjer Bošković Institute Zagreb Croatia Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Sezione INFN Bologna Italy SUBATECH Ecole des Mines de Nantes Université de Nantes CNRS-IN2P3 Nantes France Departamento de Física de Partículas and IGFAE Universidad de Santiago de Compostela Santiago de Compostela Spain Yale University New Haven Connecticut USA V. Fock Institute for Physics St. Peters

We report on the measurement of two-pion correlation functions from pp collisions at s=900 GeV performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of the Hanbury Brown–Twiss radius with increasing event multiplicity, in line with other measurements done in particle- and nuclear collisions. Conversely, the strong decrease of the radius with increasing transverse momentum, as observed at the Relativistic Heavy Ion Collider and at Tevatron, is not manifest in our data.

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Analytic method for rock bolt's non-destructive testing signals by phase deducted method

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Meitan Xuebao/Journal of the China Coal Society 2009年第5期34卷 629-633页

作者： Yang, Tian-Chun Wu, Yan-Qing Xia, Dai-Lin College of Civil Engineering Hunan University of Science and Technology Xiangtan 411201 China Chongqing Research Institute China Coal Research Institute Chongqing 400037 China Wuhan Conourish Engineering Exploration Technology Development Co. Ltd. Wuhan 430079 China

Introduced the phase deducted method into signals analysis of rock bolt's non-destructive testing. At first, Fourier transform and digital filter were employed to a collection signal, and the central frequency of the signal was regarded as an initial value in the formula of phase deducted method. Used the rule of phase calculation results with time, estimated the reflecting signals at the bottom or defects of rock bolts from phases' aberration. According to the processing results of practical data, there are aberration phenomena at the bottom or defects of rock bolts for the phase curve. Determined positions of reflecting signals, and calculated an rock bolt's length and grouting plumpness. At the same time, the defect position could be determined. The study results indicate that the signals from the bottom or defects of rock bolts can be identified rapidly, and then the construction quality can be judged. The phase deducted method can improve inversion reliability in non-destructive testing of stress wave, and it can be popularized in the rock bolt testing in the future.

关键词： Nondestructive examination

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A mining algorithm for Email's relationships based on neural networks

A mining algorithm for Email's relationships based on neural...

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International Conference on Computer science and Software engineering, CSSE 2008

作者： Hongjun, Li Haibo, Wang Jiangang, Zhang Shaoming, Huang Huazhong University of Science and Technology Wuhan University of Science and Engineering Wuhan China Wuhan University of Science and Engineering Wuhan China Hubei Provincial Water Resources Research Institute Wuhan China

ISBN: (纸本)9780769533360

The analysis of the vast storehouse of email content accumulated or produced by individual users has received relatively little attention other than for specific tasks such as relationship. Current email analysis in standard client applications consists of keyword based matching techniques for relationship of email files. We have implemented a tool, called the Email Mining Set (EMS) for analyzing email archives which includes a graphical display to explore relationships between users and groups of email users. Our design goal is to embed the technology into standard email clients, such as foxmail and Outlook, revealing far more information about a user's relationship is otherwise now possible. © 2008 IEEE.

关键词： data mining

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Υ cross section in p+p collisions at s=200 GeV

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Physical Review D 2010年第1期82卷 012004-012004页

作者： B. I. Abelev M. M. Aggarwal Z. Ahammed A. V. Alakhverdyants B. D. Anderson D. Arkhipkin G. S. Averichev J. Balewski L. S. Barnby S. Baumgart D. R. Beavis R. Bellwied M. J. Betancourt R. R. Betts A. Bhasin A. K. Bhati H. Bichsel J. Bielcik J. Bielcikova B. Biritz L. C. Bland B. E. Bonner J. Bouchet E. Braidot A. V. Brandin A. Bridgeman E. Bruna S. Bueltmann I. Bunzarov T. P. Burton X. Z. Cai H. Caines M. Calderón de la Barca Sánchez O. Catu D. Cebra R. Cendejas M. C. Cervantes Z. Chajecki P. Chaloupka S. Chattopadhyay H. F. Chen J. H. Chen J. Y. Chen J. Cheng M. Cherney A. Chikanian K. E. Choi W. Christie P. Chung R. F. Clarke M. J. M. Codrington R. Corliss M. R. Cosentino J. G. Cramer H. J. Crawford D. Das S. Dash A. Davila Leyva L. C. De Silva R. R. Debbe T. G. Dedovich M. DePhillips A. A. Derevschikov R. Derradi de Souza L. Didenko P. Djawotho S. M. Dogra X. Dong J. L. Drachenberg J. E. Draper J. C. Dunlop M. R. Dutta Mazumdar L. G. Efimov E. Elhalhuli M. Elnimr J. Engelage G. Eppley B. Erazmus M. Estienne L. Eun O. Evdokimov P. Fachini R. Fatemi J. Fedorisin R. G. Fersch P. Filip E. Finch V. Fine Y. Fisyak C. A. Gagliardi D. R. Gangadharan M. S. Ganti E. J. Garcia-Solis A. Geromitsos F. Geurts V. Ghazikhanian P. Ghosh Y. N. Gorbunov A. Gordon O. Grebenyuk D. Grosnick B. Grube S. M. Guertin A. Gupta N. Gupta W. Guryn B. Haag T. J. Hallman A. Hamed L-X. Han J. W. Harris J. P. Hays-Wehle M. Heinz S. Heppelmann A. Hirsch E. Hjort A. M. Hoffman G. W. Hoffmann D. J. Hofman R. S. Hollis H. Z. Huang T. J. Humanic L. Huo G. Igo A. Iordanova P. Jacobs W. W. Jacobs P. Jakl C. Jena F. Jin C. L. Jones P. G. Jones J. Joseph E. G. Judd S. Kabana K. Kajimoto K. Kang J. Kapitan K. Kauder D. Keane A. Kechechyan D. Kettler D. P. Kikola J. Kiryluk A. Kisiel A. G. Knospe A. Kocoloski D. D. Koetke T. Kollegger J. Konzer M. Kopytine I. Koralt W. Korsch L. Kotchenda V. Kouchpil P. Kravtsov K. Krueger M. Krus L. Kumar P. Kurnadi M. A. C. Lamont J. M. Landgraf S. LaPointe J. Lauret A. Lebedev R. Lednicky C-H. Lee J. H. Lee W. Leight M. University of Illinois at Chicago Chicago Illinois 60607 USA Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Joint Institute for Nuclear Research Dubna 141 980 Russia Kent State University Kent Ohio 44242 USA Brookhaven National Laboratory Upton New York 11973 USA Massachusetts Institute of Technology Cambridge Massachusetts 02139-4307 USA University of Birmingham Birmingham United Kingdom Yale University New Haven Connecticut 06520 USA Wayne State University Detroit Michigan 48201 USA University of Jammu Jammu 180001 India University of Washington Seattle Washington 98195 USA Czech Technical University in Prague FNSPE Prague 115 19 Czech Republic Nuclear Physics Institute AS CR 250 68 Řež/Prague Czech Republic University of California Los Angeles California 90095 USA Rice University Houston Texas 77251 USA NIKHEF and Utrecht University Amsterdam The Netherlands Moscow Engineering Physics Institute Moscow Russia Argonne National Laboratory Argonne Illinois 60439 USA Old Dominion University Norfolk Virginia 23529 USA Shanghai Institute of Applied Physics Shanghai 201800 China University of California Davis California 95616 USA Texas A&M University College Station Texas 77843 USA The Ohio State University Columbus Ohio 43210 USA University of Science & Technology of China Hefei 230026 China Institute of Particle Physics CCNU (HZNU) Wuhan 430079 China Tsinghua University Beijing 100084 China Creighton University Omaha Nebraska 68178 USA Pusan National University Pusan Republic of Korea Universidade de Sao Paulo Sao Paulo Brazil University of California Berkeley California 94720 USA Institute of Physics Bhubaneswar 751005 India University of Texas Austin Texas 78712 USA Institute of High Energy Physics Protvino Russia Universidade Estadual de Campinas Sao Paulo Brazil Lawrence Berkeley National Laboratory Berkeley California 94720 USA SUBATECH Nantes France Pennsylvania Stat

We report on a measurement of the Υ(1S+2S+3S)→e+e− cross section at midrapidity in p+p collisions at s=200 GeV. We find the cross section to be 114±38(stat+fit)−24+23(syst) pb. Perturbative QCD calculations at next-to-leading order in the color evaporation model are in agreement with our measurement, while calculations in the color singlet model underestimate it by 2σ. Our result is consistent with the trend seen in world data as a function of the center-of-mass energy of the collision and extends the availability of Υ data to RHIC energies. The dielectron continuum in the invariant-mass range near the Υ is also studied to obtain a combined yield of e+e− pairs from the sum of the Drell-Yan process and b−b¯ production.

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Dynamic model of traffic flow on on-ramp junction of city expressway

Dynamic model of traffic flow on on-ramp junction of city ex...

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8th International Conference of Chinese Logistics and Transportation Professionals - Logistics: The Emerging Frontiers of Transportation and Development in China

作者： Wang, Fu Li, Jie Xiong, Lie-Qiang Wang, Li-Shuang Transportation Research Institute Wuhan Polytechnic University Wuhan 430023 China School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780784409961

In order to improve the accuracy of capacity at an on-ramp junction, by switching a traffic continuous equation and a movement differential equation, and adopting a characteristic curve method, the theory model of traffic flow parameters on an on-ramp junction of an expressway was founded. Coordinating the theory model, the relationship equation among the merging rate, with Lane 1 flow entering the junction, the junction density was established. This relationship equation was the traffic dynamic model namely, it was calibrated by the real data finally. The result indicates that the capacity drops off along with the merging rate augment;the result through the traffic dynamic model is compared with HCM2000. The model can simulate traffic flow on an on-ramp junction of an expressway well;it is applicable universally. © ASCE.

关键词： Differential equations

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Design and implementation of spatio-temporal database of water and soil loss

Design and implementation of spatio-temporal database of wat...

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International Conference on Earth Observation data Processing and Analysis, ICEODPA

作者： Lu, Xinhai Bian, Fulin Tan, Xiaojun School of Environment and Civil Engineering Wuhan Institute of Technology 693 Xiongchu Road Wuhan Hubei 430073 China Research Centre of Spatial Information and Digital Engineering Wuhan University 129 Luoyu Road Wuhan Hubei 430070 China School of Hydropower and Infomation Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan Hubei 430074 China

This paper analyzed the features and limitations of several typical spatio-temporal data models. "spatio-temporal cube": the main disadvantage is that the target change will produce great data redundancy when under non-consecutive circumstances. "Snapshots": it repeatedly saves graphics and attribute of no changes which resulted in waste of storage spaces, and it is impossible to reflect space objects under the same domain and the relationship between the attributes. "Base State with Amendments": merely modify changing object, but it's not suitable for continuous variation space object. "space-frame composite": currently, the model is lacking of sound framework structure and application model. "Object-oriented spatio-temporal model": The modeling concept, theoretical foundation and technical realization has not yet reached a consensus, it's not mature enough. In allusion to the features of the spatial database of water and soil loss, this essay expounded the characteristics of spatiotemporal databases. Spatial features in many practical circumstances (such as thematic maps in soil and water conservation projects and space elements of soil erosion distribution map) have spatial data features, and also change with time, consequently, required us to establish spatio-temporal database, STDB, which can capture time data and space data at the same time. This analysis based on "ArcSDE versioning mechanisms" temporal and spatial database implement technologies, discussed the construction methods, process and data features of the database, and introduced the implementation of historical data rebuilding and version merging. © 2008 SPIE.

关键词： Water conservation

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Study of coupling model of freezing porous media

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Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and engineering 2008年第SUPPL.期27卷 2604-2609页

作者： Feng, Shurong Jiang, Zhongming Chen, Shenghong Xu, Weiya Institute of Geotechnical Engineering Hohai University Nanjing 210098 China Mid-south Design and Research Institute China Hydropower Engineering Consultation Croup Changsha 410014 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China Institute of Geotechnical Engineering Changsha University of Science and Technology Changsha 410076 China

Based on analysis of the water phase change process in porous media, the volumetric ratio of pore water to pore ice versus temperature is studied. A mathematic relation to describe saturated degree of pore water and pore ice undergoing freezing condition is suggested. Through the introduction of effective pore pressure concept, a coupling model based on theory of porous media is studied to simulate the variation of effective pore pressure under low temperature situation. Formulae to be able to calculate the thermal volumetric dilation coefficient of saturated and unsaturated porous media are employed to describe swelling and shrinkage characteristics of freezing porous media. The comparison results between experimental data and simulated solution validate the correctness of the proposal model in this research. It also indicates that this model could simulate the reasonable solution of effective pore pressure and skeleton stress and describe the swelling and shrinkage deformation feature. Therefore the suggested coupling model is a reasonable and effective approach for the study of the deformation and stress of freezing porous media.

关键词： Rock mechanics

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Periodic Error Compensation for Quartz MEMS Gyroscope Drift of INS

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Chinese Journal of Aeronautics 2007年第6期20卷 539-545页

作者： Xu Jianmao Zhang Haipeng Sun Junzhong College of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Instrument Science and Opto-electronics Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China Mechanical and Electrical Equipment Research Institute Qingdao Navy Submarine Academe Qingdao 266071 China

In order to improve the navigation accuracy of an inertial navigation system （INS）, composed of quartz gyroscopes, the existing real-time compensation methods for periodic errors in quartz gyroscope drift and the periodic error term relationship between sampled original data and smoothed data are reviewed. On the base of the results, a new compensation method called using former period characteristics to compensate latter smoothness data （UFCL for short） method is proposed considering the INS working characteristics. This new method uses the original data without smoothing to work out an error conversion formula at the INS initial alignment time and then compensate the smoothed data errors by way of the formula at the navigation time. Both theoretical analysis and experimental results demonstrate that this method is able to cut down on computational time and raise the accuracy which makes it a better real-time compensation approach for periodic error terms of quartz micro electronic mechanical system （MEMS） gyroscope＇s zero drift.

关键词： real-time compensation quartz MEMS gyroscope periodic error period characteristic inertial navigation system （INS）

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A modified toeplitz algorithm for doa estimation of coherent signals

A modified toeplitz algorithm for doa estimation of coherent...

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2007 International Symposium on Intelligent Signal Processing and Communications Systems, ISPACS 2007

作者： Hui, Chen Benxiong, Huang Bin, Deng Yaoqin, Hou Electronics and Information Engineering Department Huazhong University of Science and Technology HuBei WuHan 430073 China Key Research Lab. Wuhan Radar Institute Hubei Wuhan 430019 China

ISBN: (纸本)9781424414475

A new algorithdm based on cross-correlation vector Toeplitz reconstruction, called CVT method, is proposed in this paper. The CVT method can estimate coherent signal source effectively. The CVT utilizes the internal relation of array receiving data to realize signal sources de-coherent. Compared with the classical spatial smoothing algorithms the proposed algorithm has higher estimation precision under the condition of the same phase. The reason is that the CVT method can realize de-coherent completely, but the spatial smoothing algorithms realize rank reconstruction only. The produce of rank reconstruction introduces cross-correlation noise into modified signal covariance matrix. But the CVT method can transform the signal covariance matrix of coherent source into diagonal matrix. Therefore, the CVT algorithm has some advantages of low computational load, better robustness and higher estimation precision than spatial smoothing algorithm. The theoretical analysis and simulation results show that the proposed method is effective. © 2007 IEEE.

关键词： Algorithms

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