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arXiv 2023年

作者： Aad, G. Abbott, B. Abeling, K. Abicht, N.J. Abidi, S.H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Hoffman, A.C. Abusleme Acharya, B.S. Bourdarios, C. Adam Adamczyk, L. Adamek, L. Addepalli, S.V. Cppm Aix-Marseille Université CNRS/IN2P3 Marseille France Homer L. Dodge Department of Physics and Astronomy University of Oklahoma NormanOK United States II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Physics Department Brookhaven National Laboratory UptonNY United States Faculté des Sciences Université Mohammed v Rabat Morocco Raymond and Beverly Sackler School of Physics and Astronomy Tel Aviv University Tel Aviv Israel Department of Physics Technion Israel Institute of Technology Haifa Israel Department of Physics New York University New YorkNY United States Departamento de Física Pontificia Universidad Católica de Chile Santiago Chile Infn Gruppo Collegato di Udine Sezione di Trieste Udine Italy Ictp Trieste Italy Lapp Univ. Savoie Mont Blanc CNRS/IN2P3 Annecy France Agh University of Science and Technology Faculty of Physics and Applied Computer Science Krakow Poland Department of Physics University of Toronto TorontoON Canada Department of Physics Brandeis University WalthamMA United States

A search for forward proton scattering in association with light-by-light scattering mediated by an axion-like particle is presented, using the ATLAS Forward Proton spectrometer to detect scattered protons and the central ATLAS detector to detect pairs of outgoing photons. Proton-proton collision data recorded in 2017 at a centre-of-mass energy of √s = 13 TeV were analysed, corresponding to an integrated luminosity of 14.6 fb-1. A total of 441 candidate signal events were selected. A search was made for a narrow resonance in the diphoton mass distribution, corresponding to an axion-like particle (ALP) with mass in the range 150-1600 GeV. No excess is observed above a smooth background. Upper limits on the production cross section of a narrow resonance are set as a function of the mass, and are interpreted as upper limits on the ALP production coupling constant, assuming 100% decay branching ratio into a photon pair. The inferred upper limit on the coupling constant is in the range 0.04-0.09 TeV-1at 95% confidence level. © 2023, CC BY.

关键词： Forward scattering

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Iteration-complexity of a proximal augmented Lagrangian method for solving nonconvex composite optimization problems with nonlinear convex constraints

arXiv

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arXiv 2020年

作者： Kong, Weiwei Melo, Jefferson G. Monteiro, Renato D.C. Computer Science and Mathematics Division Oak Ridge National Laboratory Oak RidgeTN37830 United States Instituto de Matemática e Estatística Universidade Federal de Goiás Campus II- Caixa Postal 131 Goiânia-GOCEP 74001-970 Brazil School of Industrial and Systems Engineering Georgia Institute of Technology AtlantaGA30332-0205 United States

This paper proposes and analyzes a proximal augmented Lagrangian (NL-IAPIAL) method for solving smooth nonconvex composite optimization problems with nonlinear K-convex constraints, i.e., the constraints are convex with respect to the order given by a closed convex cone K. Each NL-IAPIAL iteration consists of inexactly solving a proximal augmented Lagrangian subproblem by an accelerated composite gradient (ACG) method followed by a Lagrange multiplier update. Under some mild assumptions, it is shown that NL-IAPIAL generates an approximate stationary solution of the constrained problem in O(log(1/ρ)/ρ3) inner iterations, where ρ > 0 is a given tolerance. Numerical experiments are also given to illustrate the computational efficiency of the proposed *** Codes 49M05, 49M37, 90C26, 90C30, 90C60, 65K05, 65K10, 68Q25, 65Y20 Copyright © 2020, The Authors. All rights reserved.

关键词： Lagrange multipliers

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THz near-field imaging of extreme subwavelength metal structures

arXiv

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arXiv 2021年

作者： Chen, Xinzhong Liu, Xiao Guo, Xiangdong Chen, Shu Hu, Hai Nikulina, Elizaveta Yao, Ziheng Betchel, Hans Martin, Michael C. Carr, G. Lawrence Dai, Qing Zhuang, Songlin Hu, Qing Zhu, Yiming Hillenbrand, Rainer Liu, Mengkun You, Guanjun Department of Physics and Astronomy Stony Brook University Stony BrookNY11794 United States Shanghai Key Lab of Modern Optical Systems Terahertz Technology Innovation Research Institute Engineering Research Center of Optical Instrument and System Ministry of Education University of Shanghai for Science and Technology Shanghai200093 China Division of Nanophotonics CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China CIC nanoGUNE Donostia-San Sebastián20018 Spain CIC nanoGUNE UPV/EHU Donostia-San Sebastián20018 Spain IKERBARSQUE Basque Foundation of Science Bilbao48013 Spain Advanced Light Source Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States National Synchrotron Light Source II Brookhaven National Laboratory UptonNY11973 United States Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States

Modern scattering-type scanning near-field optical microscopy (s-SNOM) has become an indispensable tool in material research. However, as the s-SNOM technique marches into the far-infrared (IR) and terahertz (THz) regimes, emerging experiments sometimes produce puzzling results. For example, "anomalies" in the near-field optical contrast have been widely reported. In this letter, we systematically investigate a series of extreme subwavelength metallic nanostructures via s-SNOM near-field imaging in the GHz to THz frequency range. We find that the near-field material contrast is greatly impacted by the lateral size of the nanostructure, while the spatial resolution is practically independent of it. The contrast is also strongly affected by the connectivity of the metallic structures to a larger metallic "ground plane". The observed effect can be largely explained by a quasi-electrostatic analysis. We also compare the THz s-SNOM results to those of the mid-IR regime, where the size-dependence becomes significant only for smaller structures. Our results reveal that the quantitative analysis of the near-field optical material contrasts in the long-wavelength regime requires a careful assessment of the size and configuration of metallic (optically conductive) structures. Copyright © 2021, The Authors. All rights reserved.

关键词： Metals

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Electrically Small Frequency Reconfigurable Antenna for Heterogeneous Applications

Electrically Small Frequency Reconfigurable Antenna for Hete...

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UK/ China Emerging Technologies (UCET)

作者： Wahaj Abbas Awan Syeda Iffat Naqvi Niamat Hussain Abir Zaidi Aqeel Hussain Naqvi Ahsan Hameed Department of Integrated IT Eningeering Seoul National University of Science and Technology Seoul South Korea Telecommunication Engineering Department University of Engineering and Technology Taxila Pakistan Department of Computer and Communication Engineering Chungbuk National University Cheongju South Korea Laboratory EEA & TI Faculty of Science and Techniques (FSTM) Mohammedia Hassan II University Casblanca Morocco Department of Electrical and Electronics Engineering Chung-Ang University Seoul South Korea Research Institute of Microwave and Millimeter-Wave Studies National University of Science and Technology Islamabad Pakistan

ISBN: (数字)9781728194882

ISBN: (纸本)9781728194899

A Co-Planar Waveguide (CPW) Fed frequency reconfigurable antenna for compact portable devices and heterogeneous applications is presented in this paper. The antenna offers a small electrical size of 0.17 λ0 × 0.12 λ0 × 0.013 λ0 , where λ 0 correspond to free space wavelength at lowest resonance. The geometrical configuration of the antenna comprises of the simple structure consist of a triangular radiator connected with two serpentines by means of the diode. By switching the diode state the antenna either operates in single wideband mode, dual-band mode or 2 tri-band modes. To verify the performance parameters of proposed work a prototype was fabricated and measured. Moreover, to demonstrate the potential of the proposed work it is compared with the state of the artworks.

关键词： Antenna measurements Microwave antennas Frequency measurement Wideband Switches Microwave communication

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Memorizing all for implicit discourse relation recognition

arXiv

引用

arXiv 2019年

作者： Bai, Hongxiao Zhao, Hai Zhao, Junhan Department of Computer Science and Engineering Shanghai Jiao Tong University Key Lab. of Shanghai Education Commission for Intelligent Interaction and Cognitive Engineering Shanghai Jiao Tong University Shanghai China MoE Key Lab of Artificial Intelligence Ai Institute Shanghai Jiao Tong University Computer Graphics Technology Purdue University West LafayetteIN United States

Implicit discourse relation recognition is a challenging task due to the absence of the nec-essary informative clue from explicit connec-tives. The prediction of relations requires a deep understanding of the semantic meanings of sentence pairs. As implicit discourse relation recognizer has to carefully tackle the se-mantic similarity of the given sentence pairs and the severe data sparsity issue exists in the meantime, it is supposed to be beneficial from mastering the entire training data. Thus in this paper, we propose a novel memory mecha-nism to tackle the challenges for further performance improvement. The memory mecha-nism is adequately memorizing information by pairing representations and discourse relations of all training instances, which right fills the slot of the data-hungry issue in the current im-plicit discourse relation recognizer. Our experiments show that our full model with memo-rizing the entire training set reaches new state-of-the-art against strong baselines, which es-pecially for the first time exceeds the milestone of 60% accuracy in the 4-way task. Copyright © 2019, The Authors. All rights reserved.

关键词： Semantics

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ITERATION-COMPLEXITY OF AN INNER ACCELERATED INEXACT PROXIMAL AUGMENTED LAGRANGIAN METHOD BASED ON THE CLASSICAL LAGRANGIAN FUNCTION

arXiv

引用

arXiv 2020年

作者： Kong, Weiwei Melo, Jefferson G. Monteiro, Renato D.C. Computer Science and Mathematics Division Oak Ridge National Laboratory Oak RidgeTN37830 United States Instituto de Matemática e Estatística Universidade Federal de Goiás Campus II- Caixa Postal 131 GoiâniaCEP 74001-970 Brazil School of Industrial and Systems Engineering Georgia Institute of Technology AtlantaGA30332-0205 United States

This paper establishes the iteration-complexity of an inner accelerated inexact proximal augmented Lagrangian (IAIPAL) method for solving linearly-constrained smooth nonconvex composite optimization problems that is based on the classical augmented Lagrangian (AL) function. More specifically, each IAIPAL iteration consists of inexactly solving a proximal AL subproblem by an accelerated composite gradient (ACG) method followed by a classical Lagrange multiplier update. Under the assumption that the domain of the composite function is bounded and the problem has a Slater point, it is shown that IAIPAL generates an approximate stationary solution in O(Ε−5/2 log2 Ε−1) ACG iterations where Ε > 0 is a tolerance for both stationarity and feasibility. Moreover, the above bound is derived without assuming that the initial point is feasible. Finally, numerical results are presented to demonstrate the strong practical performance of *** Codes 47J22, 49M27, 90C25, 90C26, 90C30, 90C60, 65K10 Copyright © 2020, The Authors. All rights reserved.

关键词： Lagrange multipliers

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Coupling to zone-center optical phonons in VSe2 enhanced by charge density waves

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Physical Review B 2021年第23期104卷 235137-235137页

作者： Y. Falke N. Ehlen G. Marini A. V. Fedorov V. Y. Voroshnin B. V. Senkovskiy K. Nikonov M. Hoesch T. K. Kim L. Petaccia G. Di Santo T. Szkopek G. Profeta A. Grüneis II. Physikalisches Institut Universität zu Köln Zülpicher Strasse 77 50937 Köln Germany Department of Physical and Chemical Sciences University of L'Aquila Via Vetoio 10 I-67100 Coppito Italy Institute for Solid State Research Leibniz IFW-Dresden 01069 Dresden Germany Helmholtz-Zentrum Berlin für Materialien und Energie 12489 Berlin Germany Kurnakov Institute of General and Inorganic Chemistry Russian Academy of Sciences 119991 Moscow Russia Diamond Light Source Harwell Campus Didcot OX11 0DE United Kingdom DESY Photon Science Deutsches Elektronen-Synchrotron Notkestrasse 85 22607 Hamburg Germany Elettra Sincrotrone Trieste Strada Statale 14 km 163.5 34149 Trieste Italy McGill University Department of Electrical and Computer Engineering H3A 2A7 Montreal Canada

We investigate electron-phonon coupling (EPC) in the charge density wave (CDW) phase of VSe2 by Raman spectroscopy, angle-resolved photoemission spectroscopy (ARPES), and ab initio calculations. Zone folding induced by the 4×4 in-plane CDW phase promotes the appearance of a Raman peak at ∼170cm−1. The suppression of ARPES intensity in parts of the Fermi surface is also a result of CDW-induced zone folding and anticrossing of the electron energy bands. The appearance of the new Raman peak is in line with the ARPES observation of a kink feature in the spectral function at the same energy. A self-energy analysis yields an EPC constant of λ=0.3. Our calculations of the EPC are in excellent agreement and reveal that the kink is caused by several optical phonon branches close in energy. Our paper highlights the CDW phase as a means of inducing EPC pathways to optical phonons that directly affect its Raman spectrum.

关键词： Charge density waves Fermi surface First-principles calculations

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Study of the modulation of Galactic positrons and electrons in 2006-2016 with the PAMELA Experiment 37

Study of the modulation of Galactic positrons and electrons ...

引用

37th International Cosmic Ray Conference, ICRC 2021

作者： Mikhailov, V.V. Aleksandrin, S.Y. Koldobskiy, S.A. Boezio, M. Munini, R. Aslam, O.P.M. Bisschoff, D. Ngobeni, M.D. Potgieter, M.S. Adriani, O. Barbarino, G. Bazilevskaya, G.A. Bellotti, R. Bogomolov, E.A. Bongi, M. Bonvicini, V. Bruno, A. Cafagna, F.S. Campana, D. Carlson, P. Casolino, M. Castellini, G. De Santis, C. Di Felice, V. Koldashov, S.V. Koldobskiy, S.A. Kvashnin, A.N. Leonov, A. Malakhov, V.V. Marcelli, L. Marcelli, N. Martucci, M. Mayorov, A.G. Menn, W. Merge, M. Mikhailov, V.V. Mocchiutti, E. Monaco, A. Mori, N. Lenni, A. Osteria, G. Papini, P. Panico, B. Pearce, M. Picozza, P. Ricci, M. Ricciarini, S.B. Simon, M. Sparvoli, R. Spillantini, P. Stozhkov, Yu.I. Vacchi, A. Vannuccini, E. Vasiliev, G.I. Voronov, S.A. Yurkin, Yu.T. Zampa, G. Zampa, N. National Research Nuclear University MEPhI 31 Kashirskoe shosse Moscow Russia Centre for Space Research North-West University Potchefstroom South Africa School of Physical and Chemical Sciences North-West University Mmabatho South Africa Institute for Experimental and Applied Physics CA University Kiel Germany INFN Sezione di Florence Florence Sesto FiorentinoI-50019 Italy University of Florence Department of Physics Florence Sesto FiorentinoI-50019 Italy University of Naples "Federico II" Department of Physics NaplesI-80126 Italy INFN Sezione di Naples NaplesI-80126 Italy Lebedev Physical Institute MoscowRU-119991 Russia INFN Sezione di Trieste TriesteI-34149 Italy INFN Sezione di Bari Physics Department of University of Bari Italy Ioffe Physical Technical Institute St. PetersburgRU-194021 Russia KTH Department of Physics The Oskar Klein Centre for Cosmoparticle Physics Sweden INFN Sezione di Rome "Tor Vergata" RomeI-00133 Italy National Research Nuclear University MEPhI MoscowRU-115409 Russia IFAC Florence Sesto FiorentinoI-50019 Italy Universitat Siegen Department of Physics SiegenD-57068 Germany INFN Laboratori Nazionali di Frascati Via Enrico Fermi 40 FrascatiI-00044 Italy Istituto Nazionale di Astrofisica Fosso del cavaliere 100 Roma00133 Italy University of Udine Department of Mathematics Computer Science and Physics Via delle Scienze Udine206 Italy RIKEN EUSO Team Global Research Cluster Saitama Wako-shi Japan University of Rome "Tor Vergata" Department of Physics RomeI-00133 Italy University of Bari Department of Physics BariI-70126 Italy

The PAMELA experiment had operated almost ten years on board of the Resurs DK1 satellite. The satellite was launched on the 15tℎ of June 2006 and placed in orbit with an inclination of 70° and an altitude of 350 to 610 km. The experiment had continuously measured electron and positron fluxes of Galactic cosmic rays in a wide energy range from about 50 MeV to hundreds of GeV. The spectra of electrons have been analysed from the end of 23rd until the beginning of 24tℎ solar cycle including the prolonged deep solar minimum period from 2006 to the end of 2009 and the solar magnetic polarity reversal period in 2012-2014. Here, we present updated annual electron spectra from 2006 to 2015. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Positrons

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First measurement of the top quark pair production cross section in proton-proton collisions at s = 13.6 TeV

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Journal of High Energy Physics 2023年第8期2023卷 204页

作者： Tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.S. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, T. Kello, T. Van Mechelen, P. Bols, E.S. D’Hondt, J. De Moor, A. Delcourt, M. El Faham, H. Lowette, S. Morton, A. Müller, D. Sahasransu, A.R. Tavernier, S. Van Doninck, W. Van Putte, S. Vannerom, D. Clerbaux, B. Dansana, S. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Lee, K. Mahdavikhorrami, M. Makarenko, I. Malara, A. Paredes, S. Pétré, L. Postiau, N. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. Dobur, D. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. Samalan, A. Skovpen, K. Tytgat, M. Van Den Bossche, N. Vermassen, B. Wezenbeek, L. Benecke, A. Bruno, G. Bury, F. Caputo, C. David, P. Delaere, C. Donertas, I.S. Giammanco, A. Jaffel, K. Jain, Sa. Lemaitre, V. Lidrych, J. Mondal, K. Tran, T.T. Vischia, P. Wertz, S. Alves, G.A. Coelho, E. Hensel, C. Moraes, A. Rebello Teles, P. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Dos Santos Sousa, V. Fonseca De Souza, S. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. Santoro, A. Silva Do Amaral, S.M. Sznajder, A. Thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Orzari, B. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Shumka, E. Keshri, S. Thakur, S. Cheng, T. Guo, Q. Javaid, T. Mittal, M. Yuan, L. Bauer, G. Hu, Z. Lezki, S. Yi, K. Chen, G.M. Chen, H.S. Chen, M. Iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Milosevic, V. Monti, F. Sharma, R. Tao, J. Wang, J. Zhang, H. Zhao, J Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) - Fudan University Shanghai China Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

The first measurement of the top quark pair (tt¯) production cross section in proton-proton collisions at s = 13.6 TeV is presented. Data recorded with the CMS detector at the CERN LHC in Summer 2022, corresponding to an integrated luminosity of 1.21 fb⁻¹, are analyzed. Events are selected with one or two charged leptons (electrons or muons) and additional jets. A maximum likelihood fit is performed in event categories defined by the number and flavors of the leptons, the number of jets, and the number of jets identified as originating from b quarks. An inclusive tt¯ production cross section of 881 ± 23 (stat + syst) ± 20 (lumi) pb is measured, in agreement with the standard model prediction of 924₋₄₀⁺³² pb. © The Author(s) 2023.

关键词： Hadron-Hadron Scattering Top Physics

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Performance Analysis of a Cloud Computing System using Queuing Model with Correlated Task Reneging

引用

Journal of Physics: Conference Series 2021年第1期2091卷

作者： Rakesh Kumar Bhavneet Singh Soodan Godlove Suila Kuaban Piotr Czekalski Sapana Sharma School of Mathematics Shri Mata Vaishno Devi University Katra Jammu and Kashmir 182320 India Department of Mathematics and Statistics Namibia University of Science and Technology Private Bag 13388 Windhoek Namibia 13 Jackson Kaujeua Street Windhoek Namibia Institute of Theoretical and Applied Informatics Polish Academy of Sciences Baltycka 5 44-100 Gliwice Poland Department of Computer Graphics Vision and Digital Systems Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Department of Mathematics Cluster University of Jammu Jammu and Kashmir

Queuing theory has been extensively used in the modelling and performance analysis of cloud computing systems. The phenomenon of the task (or request) reneging, that is, the dropping of requests from the request queue often occur in cloud computing systems, and it is important to consider it when developing performance evaluations models for cloud computing infrastructures. Majority of studies in the performance evaluation of cloud computing data centres with the use of queuing theory do not consider the fact that the tasks could be removed from queue without being serviced. The removal of tasks from the queue could be due to the user impatience, execution deadline expiration, security reasons, or as an active queue management strategy. The reneging could be correlated in nature, that is, if a request is dropped (or reneged) at any time epoch, and then there is a probability that a request may or may not be dropped at the next time epoch. This kind of dropping (or reneging) of requests is referred to as correlated request reneging. In this paper we have modelled a cloud computing infrastructure with correlated request reneging using queuing theory. An M/M/1/N queuing model with correlated reneging has been used to study the performance analysis of the load balancing server of a cloud computing system. The steady-state as well as the transient performance analyses have been carried out. Important measures of performance like average queue size, average delay, probability of task blocking, and the probability of no waiting in the queue are studied. Finally, some comparisons are performed which describe the effect of correlated task reneging over simple exponential reneging.

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