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ENVIRONMENTAL SCIENCE & TECHNOLOGY 2008年第20期42卷 7643-7648页

作者： Dewan, Alim Beyenal, Haluk Lewandowski, Zbigniew Montana State Univ Dept Civil Engn Ctr Biofilm Engn Bozeman MT 59717 USA Washington State Univ Sch Chem Engn & Biol Engn Ctr Environm Sediment Aquat Res Pullman WA 99163 USA

The goal of this study was to quantify the relation between the surface area of the current-limiting electrode of a microbial fuel cell (MFC) and the power density generated by the MFC. Shewanella oneidensis (MR-1) was grown anaerobically in the anodic compartment of an MFC utilizing lactate as the electron donor. Graphite plate electrodes of various sizes were used as anodes. Commercially available air electrodes, composed of manganese-based catalyzed carbon bonded to a current-collecting screen made of platinum mesh, were used as cathodes, and dissolved oxygen was used as the cathodic reactant The surface area of the cathode was always significantly larger than that of the anode, to ensure that the anode was the current-limiting electrode. The power density generated by the MFC decreased as the surface area of the anode increased, which fits well with the trend we detected comparing various published results. Thus, our findings bring into question the assertion that the overall power density generated by an MFC with large electrodes can be estimated by extrapolating from an electrode with a small surface area. Our results indicate that the maximum power density generated by an MFC is not directly proportional to the surface area of the anode, but is instead proportional to the logarithm of the surface area of the anode.

关键词： Quantitative research Gram-negative bacteria Electric currents Electrodes Fuel cells Cathodes Anodes Research methodology logarithmic functions

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Applying LU Decomposition of Matrices to Design Anonymity Bilateral Remote User Authentication Scheme

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MATHEMATICAL PROBLEMS IN ENGINEERING 2013年第1期2013卷 1-10页

作者： Li, Xiong Niu, Jianwei Khan, Muhammad Khurram Wang, Zhibo Hunan Univ Sci & Technol Sch Comp Sci & Engn Xiangtan 411201 Peoples R China Beihang Univ State Key Lab Software Dev Environm Beijing 100191 Peoples R China King Saud Univ Ctr Excellence Informat Assurance Riyadh 11653 Saudi Arabia E China Inst Technol Coll Software Nanchang 330013 Peoples R China

We apply LU decomposition of matrices to present an anonymous bilateral authentication scheme. This paper aims at improving security and providing more excellent performances for remote user authentication scheme. The proposed scheme can provide bilateral authentication and session key agreement, can quickly check the validity of the input password, and can really protect the user anonymity. The security of the proposed scheme is based on the discrete logarithm problem (DLP), Diffie- Hellman problem (DHP), and the one- way hash function. It can resist various attacks such as insider attack, impersonation attack, server spoofing attack, and stolen smart card attack. Moreover, the presented scheme is computationally efficient for real-life implementation.

关键词： DECOMPOSITION (Mathematics) MATRICES COMPUTER access control COMPUTER users COMPUTATIONAL complexity logarithmic functions

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Risk-Informed Analysis of Accidents at Reactor Facilities with VVER

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ATOMIC ENERGY 2018年第4期123卷 224-229页

作者： Kozlachkov, A. N. Siryapin, V. N. Siryapin, N. V. Tribelev, A. A. Shein, V. P. Gidropress Expt Design Bur OKB Gidropress Podolsk Russia

An accident with 'rupture of steam line' as the initial event was studied for a reactor facility with VVER-1000. A computational analysis was performed of different flow scenarios of an accident with singular and multiple failures of the safety systems. The realization probability and the consequences were evaluated for each accident sequence. The consequences of the accidents are ranked and the most instructive combinations of failures of systems and blockings are determined from the standpoint of risk. The presented method is based on multivariate calculations and an integrated combination of deterministic and probabilistic approaches to safety validation.

关键词： NUCLEAR reactor accidents NUCLEAR reactor safety measures PROBABILITY theory MULTIVARIATE analysis logarithmic functions

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A method for speech signal processing based on band filtering of the logarithmic spectrum

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AUTOMATION AND REMOTE CONTROL 2014年第3期75卷 496-502页

作者： Kolokolov, A. S. Russian Acad Sci Trapeznikov Inst Control Sci Moscow Russia

We propose a method for speech signal preprocessing based on band filtering of the logarithmic amplitude spectrum with a filter with odd impulse characteristic. With such filtering, we can detect local nonuniformities in the spectrum of a speech signal caused by abrupt inclinations of the vocal tract frequency characteristic, which represent useful features for speech recognition. We show examples of using the proposed approach on natural speech signals.

关键词： AUTOMATIC speech recognition FILTERING theory (Signal processing) SPEECH perception logarithmic functions VOCAL tract

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Robust stability of systems of linear differential equations with periodic impulsive influence

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AUTOMATION AND REMOTE CONTROL 2012年第6期73卷 1005-1015页

作者： Slyn'ko, V. I. Denisenko, V. S. Natl Acad Sci Timoshenko Inst Mech Kiev Ukraine Khmelnitsky Cherkassy Natl Univ Cherkassy Ukraine

We give sufficient robust stability conditions for matrix polytopes of linear systems with impulsive influence. The methods of our study are based on logarithmic matrix measure theory and linear operator theory in Banach spaces. Our results reduce the robust stability problem to the feasibility problem for a system of linear matrix inequalities in the class of positive definite matrices.

关键词： LINEAR differential equations LINEAR systems logarithmic functions MEASURE theory LINEAR operators BANACH spaces LINEAR matrix inequalities

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A new prediction model on the luminance of OLEDs subjected to different reverse biases for alleviating degradation in AMOLED displays

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MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS 2015年第12期21卷 2771-2776页

作者： Yu, Ming-Hung Tran, Trong-Hieu Hsu, Yen-Ping Chao, Paul C. -P. Lee, Kuei-Yu Kao, Yung-Hua Natl Chiao Tung Univ Dept Elect Engn Hsinchu 300 Taiwan

A new prediction model for estimating luminance degradation of an OLED subjected to varied combinations of forward and reverse biases is proposed. To this end, the known increase in the voltage of OLEDs under long-time operation versus degraded emitted luminance is first-time ever considered to identify the degradation exponent as logarithm functions of elapsed time. With the identified degradation versus time, the degraded OLED luminance can be well predicted even subjected to varied combinations of forward and reverse biases. The established model is particularly useful for achieving required lifetime of modern AMOLED displays. Based on the model in terms of equations, the OLED parameters including forward, reverse bias stresses, and initial luminance can be applied to the model to accurately estimate the luminance variation during long-time operation. The estimation error between model predictions and experimental measurements is less than 1.6 %.

关键词： ORGANIC light emitting diodes PREDICTION models LUMINANCE (Photometry) SAMPLING error (Statistics) logarithmic functions

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On an integral-type operator from logarithmic Bloch-type and mixed-norm spaces to Bloch-type spaces

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NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS 2009年第12期71卷 6323-6342页

作者： Stevic, Stevo Serbian Acad Sci Math Inst Belgrade 11000 Serbia

This paper studies the boundedness and compactness of the following integral-type operator, recently introduced by this author, p(phi)(g)f(z) = integral(1)(0)f(phi(tz))g(tz)dt/t, z is an element of B, where phi is a holomorphic self-map of the unit ball B in C-n and g is a holomorphic function on B such that g(0) = 0, from logarithmic Bloch-type and mixed-norm spaces to Bloch-type spaces. (C) 2009 Elsevier Ltd. All rights reserved.

关键词： INTEGRAL operators logarithmic functions MATRIX norms COMPACTIFICATION (Mathematics) FUNCTION spaces HOLOMORPHIC functions

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Hot deformation of AA6082-T4 aluminum alloy

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JOURNAL OF MATERIALS SCIENCE 2008年第18期43卷 6324-6330页

作者： El-Danaf, Ehab A. AlMajid, Abdulhakim A. Soliman, Mahmoud S. King Saud Univ Dept Mech Engn Coll Engn Riyadh Saudi Arabia

High-temperature tensile deformation of 6082-T4 Al alloy was conducted in the range of 623-773 K at various strain rates in the range of 5 x 10(-5) to 2 x 10(-2) s(-1). Stress dependence of the strain rate revealed a stress exponent, n of 7 throughout the ranges of temperatures and strain rates tested. This stress exponent is higher than what is usually observed in Al-Mg alloys under similar experimental conditions, which implies the presence of threshold stress. This behavior results from dislocation interaction with second phase particles (Mg2Si). The experimental threshold stress values were calculated, based on the finding that creep rate is viscous glide controlled, based on creep tests conducted on binary Al-1Mg at 673 K, that gave n a value of 3. The threshold stress (sigma(o)) values were seen to decrease exponentially with temperature. The apparent activation energy for 6082-T4 was calculated to be about 245 kJ mol(-1), which is higher than the activation energy for self-diffusion in Al (Q(d) = 143 kJ mol(-1)) and for the diffusion of Mg in Al (115-130 kJ mol(-1)). By incorporating the threshold stress in the analysis, the true activation energy was calculated to be about 107 kJ mol(-1). Analysis of strain rate dependence in terms of the effective stress (sigma - sigma(o)) using normalized parameters, revealed a single type of deformation behavior. A plot of normalized strain rate ((epsilon)over dotkT/DGb) versus normalized effective stress (sigma - sigma(o))/G, on a double logarithmic scale, gave an n value of 3.

关键词： DEFORMATIONS (Mechanics) ALUMINUM alloys DIFFUSION STRAINS & stresses (Mechanics) MAGNESIUM SILICON logarithmic functions

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MAXIMAL TRANSCENDENTALITY AND INTEGRABILITY

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ACTA PHYSICA POLONICA B 2008年第9期39卷 2265-2285页

作者： Lipatov, L. N. Inst Theoret Phys 2 D-22761 Hamburg Germany Petersburg Nucl Phys Inst St Petersburg 188300 Russia

The Hamiltonian describing possible interactions of the Reggeized gluons in the leading logarithmic approximation (LLA) of the multicolor QCD has the properties of conformal invariance, holomorphic separability and duality. It coincides with the Hamiltonian of the integrable Heisenberg model with the spins being the Mobius group generators. With the use of the Baxter-Sklyanin representation we calculate intercepts of the colorless states constructed from three and four Reggeized gluons and anomalous dimensions of the corresponding high twist operators. The integrability properties of the BFKL equation at a finite temperature are reviewed. Maximal transcendentality is used to construct anomalous dimensions of twist-2 operators up to 4 loops. It is shown that the asymptotic Bethe Ansatz in the 4-loop approximation is not in an agreement with predictions of the BFKL equation in N = 4 SUSY.

关键词： HAMILTONIAN systems GLUONS REGGE theory logarithmic functions QUANTUM chromodynamics HEISENBERG uncertainty principle

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Symmetry and Orbit Detection via Lie-Algebra Voting

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COMPUTER GRAPHICS FORUM 2016年第5期35卷 217-227页

作者： Shi, Zeyun Alliez, Pierre Desbrun, Mathieu Bao, Hujun Huang, Jin Zhejiang Univ Hangzhou Zhejiang Peoples R China Inria Le Chesnay France CALTECH Pasadena CA 91125 USA

In this paper, we formulate an automatic approach to the detection of partial, local, and global symmetries and orbits in arbitrary 3D datasets. We improve upon existing voting-based symmetry detection techniques by leveraging the Lie group structure of geometric transformations. In particular, we introduce a logarithmic mapping that ensures that orbits are mapped to linear subspaces, hence unifying and extending many existing mappings in a single Lie-algebra voting formulation. Compared to previous work, our resulting method offers significantly improved robustness as it guarantees that our symmetry detection of an input model is frame, scale, and reflection invariant. As a consequence, we demonstrate that our approach efficiently and reliably discovers symmetries and orbits of geometric datasets without requiring heavy parameter tuning.

关键词： Symmetry (Mathematics) Lie algebras Lie groups logarithmic functions Subspaces (Mathematics) Set theory

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