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Noise-induced threshold shift and pattern formation in electroconvection by controlling characteristic time scales

Physical Review E 2011年第2期84卷 025302(R)-025302(R)页

作者： Jong-Hoon Huh Department of Mechanical Information Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka 820-8502 Japan

We report external noise-induced threshold shift and pattern formation in ac-driven electroconvection (EC) in nematic liquid crystals. We investigate the noise intensity dependence of the threshold and determine the relationship fc*=hfcda (α ∼ 1.4, h ∼ 0.1) between the characteristic cutoff frequency (fc*) of the noise and the characteristic ac frequency (fcd) of EC. For fc>fc*, the noise contributes to stabilizing EC (i.e., upward threshold shift), whereas for fc

关键词： Nematic liquid crystals

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Characterizing distributed XML processing: Moving XML processing from servers to networking nodes

Characterizing distributed XML processing: Moving XML proces...

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作者： Uratani, Yoshiyuki Koide, Hiroshi Cavendish, Dirceu Oie, Yuji Graduate School of CS and Systems Engineering Kyushu Institute of Technology Iizuka 820-8502 Fukuoka Japan Faculty of Computer Science of Systems Engineering Kyushu Institute of Technology Iizuka 820-8502 Fukuoka Japan Network Design Research Center Kyushu Institute of Technology Iizuka 820-8502 Fukuoka Japan

ISBN: (纸本)9789898425515

This study characterizes distributed XML processing on networking nodes. XML documents are sent from a client node to a server node through relay nodes, which process the documents before arriving at the server. When the relay nodes are connected tandem, the XML documents are processed in a pipelining manner. When the relay nodes are connected parallel, the XML documents are processed in a parallel fashion. Well-formedness and grammar validation pipelining and parallel processing characterization reveals inherent advantages of the parallel processing model.

关键词： XML

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Development of cast-iron/steel composite by fusion welding

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Weld...

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Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 2011年第1期29卷 29-34页

作者： Honda, Tsuguo Kuroki, Hironori Yamaguchi, Tomiko Nishio, Kazumasa Kurokikogyosho Co. Ltd. Japan Faculty of Engineering Kyushu Institute of Technology Japan Graduate School of Life Science and System Engineering Kyushu Institute of Technology Japan

Cast iron with nodular graphite was surface welded on 12mm thick, 150mm and 350mm wide, and 600mm long SS400 plates, by self-shielded gas arc welding method. Instead of ordinary preheating, the heat-flows from multiple weld beads were accumulated to raise the temperature of welding zone. For the purpose, the parallel beads were laterally reciprocated at a small bead pitch of 3mm. The effect of welding heat-cycle on the microstructure and mechanical properties of the deposited metal was investigated, changing the reciprocating length, 110mm and 310mm. Main results obtained were as follows;(1) The influence of the heat-flows from preceding and following weld beads on the structure of deposited metals were composed of two major parts. They were the influence of slow cooling, and that of annealing effect on the rapidly-cooled deposited metal. (2) With the short welding heat cycle on the 150mm wide specimen, the molten metal was kept in a temperature range higher than 1500K with a small fluctuation, and cooled slowly resulting bull's-eyes structure with small amount of cementite. (3) With the long heat cycle on the 350mm wide specimen, the deposited metal was rapidly cooled. Following rapid cooling, the temperature of the deposited metal was sharply fluctuated with lower end below 1200K, as the subsequent beads approached and departed, resulting many small graphite nodules in the ferrite matrix. (4) Except the 1st bead, low dilutions resulted from the small bead pitch.

关键词： Cast iron

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Performance improvement method for ISDB-T receiver under fast fading channel

Performance improvement method for ISDB-T receiver under fas...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Tatsumi Uwai Nico Surantha Yuhei Nagao Masayuki Kurosaki Hiroshi Ochi Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

In mobile environment, decode quality is largely influenced by multipath fading and Doppler shift. In this paper, we reported improvement of mobile reception for high-definition television (HDTV) of integrated services digital broadcasting - terrestrial (ISDB-T) by using maximum ratio combining (MRC) diversity and using two-dimensional (2D) filter in channel estimation. From computer simulations, we show that the bit error rate (BER) of the proposed method is improved compared to that of conventional systems. Finally, we verify reception quality of a received movie signal using our proposed system via computer simulation.

关键词： Channel estimation HDTV Multiplexing Data communication Digital multimedia broadcasting Communication standards Fading

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Study on Energy-Efficient Routing Protocol Based on Experimental Evaluation

Study on Energy-Efficient Routing Protocol Based on Experime...

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International Conference on Intelligent Networking and Collaborative systems (INCOS)

作者： Satoru Akimoto Hitomi Tamura Kenji Kawahara Yoshiaki Hori Graduate School of Information Science and Electrical Engineering Kyushu University Japan Faculty of Engineering Fukuoka Institute of Technology Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Japan

The green ICT is becoming extremely important for energy saving. The power consumption of network devices i.e., switches and routers, can be reduced by changing the transmission rate on their interfaces according to the amount of traffic. Energy-efficient routing based on the power reduction of devices may be attractive way for effectively saving energy over networks. Some schemes for energy-efficient routing have been studied in which traffic from some sources is aggregated on the particular link/node for power saving of others when the amount of traffic on network becomes low. Effectiveness of these schemes were shown by computer simulations and experiments in their own network environments. Therefore in this paper, we first implement some schemes on our test-bed network to compare both power consumption and transmission performance of them. We also investigate the applicability and scalability of these schemes on large scale networks and finally discuss important issues for more general and effective schemes.

关键词： Routing protocols Routing Scalability Loss measurement Power demand Network topology Energy measurement

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Effectiveness of priority and path control schemes for grid applications

Effectiveness of priority and path control schemes for grid ...

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IEEE Pacific Rim Conference on Communications, computers and Signal Processing

作者： Katsuichi Nakamura Takeshi Ikenaga Yuji Oie Network Design Research Center Kyushu Institute of Technology Fukuoka Japan Faculty of Engineering Kyushu Institute of Technology Fukuoka Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

In grid computing environments, a resource control that considers not only the ability of computer resources but also available network resources is needed in order to execute parallel and distributed processing effectively. In particular, the execution performance of a grid application will sometimes decrease due to the congestion caused by multiple flows running on the same network path. Therefore, a network control scheme in grid computing environments should consider the multiple flows generated from its own application as well as from other applications. In this paper, we propose and evaluate its effect of a priority control scheme for multiple flows that are generated simultaneously, in order to reduce the execution time of the grid applications without reserving network resources. Moreover, a method for improving the effect of the priority control by using path selection is discussed, which distinguishes the priority flows from the other flows.

关键词： Grid computing computers Bandwidth Distributed processing Routing Network topology Quality assessment

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Measurement of Z Boson Production in Pb-Pb Collisions at sNN=2.76 TeV with the ATLAS Detector

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Physical Review Letters 2013年第2期110卷 022301-022301页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit P. Adragna T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni M. Aharrouche S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. V. Akimov M. S. Alam M. A. Alam J. Albert S. Albrand M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov S. P. Amor Dos Santos A. Amorim N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei M.-L. Andrieux X. S. Anduaga P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki S. Aoun L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J.-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai S. Ask B. Åsman L. Asquith K. Assamagan A. Astbury M. Atkinson B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus J. Backus Mayes E. Badescu P. Bagnaia S. Bahinipati Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker M. D. Baker S. Baker P. Balek E. Banas P. Banerjee Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov A. Barbaro Galtieri T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch A. Bas Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat a l’Energie Atomique) Gif-sur-Yvette France INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Ber

The ATLAS experiment has observed 1995 Z boson candidates in data corresponding to 0.15 nb−1 of integrated luminosity obtained in the 2011 LHC Pb+Pb run at sNN=2.76 TeV. The Z bosons are reconstructed via dielectron and dimuon decay channels, with a background contamination of less than 3%. Results from the two channels are consistent and are combined. Within the statistical and systematic uncertainties, the per-event Z boson yield is proportional to the number of binary collisions estimated by the Glauber model. The elliptic anisotropy of the azimuthal distribution of the Z boson with respect to the event plane is found to be consistent with zero.

关键词： Bosons

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Observation of Associated Near-Side and Away-Side Long-Range Correlations in sNN=5.02 TeV Proton-Lead Collisions with the ATLAS Detector

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Physical Review Letters 2013年第18期110卷 182302-182302页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit P. Adragna T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. P. A. Åkesson G. Akimoto A. V. Akimov M. A. Alam J. Albert S. Albrand M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke L. J. Allison P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov S. P. Amor Dos Santos A. Amorim S. Amoroso N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei X. S. Anduaga S. Angelidakis P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin S. Argyropoulos E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal A. Artamonov G. Artoni D. Arutinov S. Asai S. Ask B. Åsman L. Asquith K. Assamagan R. Astalos A. Astbury M. Atkinson B. Auerbach E. Auge K. Augsten M. Aurousseau G. Avolio D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus J. Backus Mayes E. Badescu P. Bagnaia Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker S. Baker P. Balek F. Balli E. Banas P. Banerjee Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa R. Bartoldus A. E. Barton V. Bartsch A. Basye R. L. Bates L. Batkova J. R. Batley A. Battaglia M. Battistin Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat à l’Energie Atomique et aux Energies Alternatives) Gif-sur-Yvette France INFN Gruppo Collegato di Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics

Two-particle correlations in relative azimuthal angle (Δϕ) and pseudorapidity (Δη) are measured in sNN=5.02 TeV p+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 μb−1 of data as a function of transverse momentum (pT) and the transverse energy (ΣETPb) summed over 3.1<η<4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2<|Δη|<5) “near-side” (Δϕ∼0) correlation that grows rapidly with increasing ΣETPb. A long-range “away-side” (Δϕ∼π) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small ΣETPb, is found to match the near-side correlation in magnitude, shape (in Δη and Δϕ) and ΣETPb dependence. The resultant Δϕ correlation is approximately symmetric about π/2, and is consistent with a dominant cos 2Δϕ modulation for all ΣETPb ranges and particle pT.

关键词： PAIRING correlations (Nuclear physics) COLLISIONS (Nuclear physics) PROTONS LEAD LARGE Hadron Collider (France & Switzerland) QUANTUM chromodynamics

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Search for Dark Matter Candidates and Large Extra Dimensions in Events with a Photon and Missing Transverse Momentum in pp Collision Data at s=7 TeV with the ATLAS Detector

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Physical Review Letters 2013年第1期110卷 011802-011802页

作者： G. Aad T. Abajyan B. Abbott J. Abdallah S. Abdel Khalek A. A. Abdelalim O. Abdinov R. Aben B. Abi M. Abolins O. S. AbouZeid H. Abramowicz H. Abreu B. S. Acharya L. Adamczyk D. L. Adams T. N. Addy J. Adelman S. Adomeit P. Adragna T. Adye S. Aefsky J. A. Aguilar-Saavedra M. Agustoni M. Aharrouche S. P. Ahlen F. Ahles A. Ahmad M. Ahsan G. Aielli T. Akdogan T. P. A. Åkesson G. Akimoto A. V. Akimov M. S. Alam M. A. Alam J. Albert S. Albrand M. Aleksa I. N. Aleksandrov F. Alessandria C. Alexa G. Alexander G. Alexandre T. Alexopoulos M. Alhroob M. Aliev G. Alimonti J. Alison B. M. M. Allbrooke P. P. Allport S. E. Allwood-Spiers J. Almond A. Aloisio R. Alon A. Alonso F. Alonso A. Altheimer B. Alvarez Gonzalez M. G. Alviggi K. Amako C. Amelung V. V. Ammosov S. P. Amor Dos Santos A. Amorim N. Amram C. Anastopoulos L. S. Ancu N. Andari T. Andeen C. F. Anders G. Anders K. J. Anderson A. Andreazza V. Andrei M-L. Andrieux X. S. Anduaga P. Anger A. Angerami F. Anghinolfi A. Anisenkov N. Anjos A. Annovi A. Antonaki M. Antonelli A. Antonov J. Antos F. Anulli M. Aoki S. Aoun L. Aperio Bella R. Apolle G. Arabidze I. Aracena Y. Arai A. T. H. Arce S. Arfaoui J-F. Arguin E. Arik M. Arik A. J. Armbruster O. Arnaez V. Arnal C. Arnault A. Artamonov G. Artoni D. Arutinov S. Asai R. Asfandiyarov S. Ask B. Åsman L. Asquith K. Assamagan A. Astbury M. Atkinson B. Aubert E. Auge K. Augsten M. Aurousseau G. Avolio R. Avramidou D. Axen G. Azuelos Y. Azuma M. A. Baak G. Baccaglioni C. Bacci A. M. Bach H. Bachacou K. Bachas M. Backes M. Backhaus E. Badescu P. Bagnaia S. Bahinipati Y. Bai D. C. Bailey T. Bain J. T. Baines O. K. Baker M. D. Baker S. Baker E. Banas P. Banerjee Sw. Banerjee D. Banfi A. Bangert V. Bansal H. S. Bansil L. Barak S. P. Baranov A. Barbaro Galtieri T. Barber E. L. Barberio D. Barberis M. Barbero D. Y. Bardin T. Barillari M. Barisonzi T. Barklow N. Barlow B. M. Barnett R. M. Barnett A. Baroncelli G. Barone A. J. Barr F. Barreiro J. Barreiro Guimarães da Costa P. Barrillon R. Bartoldus A. E. Barton V. Bartsch A. Basye R. L. Ba Fakultät für Mathematik und Physik Albert-Ludwigs-Universität Freiburg Germany Physikalisches Institut University of Bonn Bonn Germany Homer L. Dodge Department of Physics and Astronomy University of Oklahoma Norman Oklahoma USA Institut de Física d’Altes Energies and Departament de Física de la Universitat Autònoma de Barcelona and ICREA Barcelona Spain LAL Université Paris-Sud and CNRS/IN2P3 Orsay France Section de Physique Université de Genève Geneva Switzerland Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Nikhef National Institute for Subatomic Physics and University of Amsterdam Amsterdam Netherlands Department of Physics Oklahoma State University Stillwater Oklahoma USA Department of Physics and Astronomy Michigan State University East Lansing Michigan USA Department of Physics University of Toronto Toronto Ontario Canada Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers) CEA Saclay (Commissariat a l’Energie Atomique) Gif-sur-Yvette France INFN Gruppo Collegato di Udine Udine Italy ICTP Trieste Italy AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Physics Department Brookhaven National Laboratory Upton New York USA Department of Physics Hampton University Hampton Virginia USA Department of Physics Yale University New Haven Connecticut USA Fakultät für Physik Ludwig-Maximilians-Universität München München Germany School of Physics and Astronomy Queen Mary University of London London United Kingdom Particle Physics Department Rutherford Appleton Laboratory Didcot United Kingdom Department of Physics Brandeis University Waltham Massachusetts USA Departamento de Fisica Teorica y del Cosmos and CAFPE Universidad de Granada Granada Spain Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Be

Results of a search for new phenomena in events with an energetic photon and large missing transverse momentum in proton-proton collisions at s=7 TeV are reported. Data collected by the ATLAS experiment at the LHC corresponding to an integrated luminosity of 4.6 fb−1 are used. Good agreement is observed between the data and the standard model predictions. The results are translated into exclusion limits on models with large extra spatial dimensions and on pair production of weakly interacting dark matter candidates.

关键词： Galaxies

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Response of electrohydrodynamic convection to external noise

Response of electrohydrodynamic convection to external noise

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International Conference on Noise and Fluctuations (ICNF)

作者： Jong-Hoon Huh Xiangwen Cui Department of Mechanical Iriformation Science and Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781457701894

We report noise-induced threshold shifts in ac-driven electrohydrodynamic convection (EHC) in nematic liquid crystals. By changing the intensity V N and cutoff frequency f c of noise, we investigate EHC-threshold shifts. There exists the characteristic cutoff frequency f c * for the influence of noise on EHC. For cutoff frequencies f c >; f c *, noise contributes to stabilizing the onset of EHC (i.e., it shifts the onset threshold upward), whereas for f c c*, noise contributes to destabilizing the onset of EHC (i.e., it shifts the onset threshold downward). For f c = f c *, noise makes no contribution to the threshold shift (i.e., it is neutral with respect to the onset of EHC). However, the pattern structure of EHC is changed by V N , independent of f c .

关键词： Sensitivity Cutoff frequency

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