bluuebunny/crossref_metadata_2025 huggingface dataset:
A Network of Control Mediated by Regulator of Calcium/Calmodulin-Dependent Signaling
Authors: Rakhilin S. V. , Olson P. A. , Nishi A. , Starkova N. N. , Fienberg A. A. , Nairn A. C. , Surmeier D. J. , Greengard P.
Published: October 2004

Calmodulin (CaM) is a major effector for the intracellular actions of Ca
2+
in nearly all cell types. We identified a CaM-binding protein, designated regulator of calmodulin signaling (RCS). G protein–coupled receptor (GPCR)–dependent activation of protein kinase A (PKA) led to phosphorylation of RCS at Ser
55
and increased its binding to CaM. Phospho-RCS acted as a competitive inhibitor of CaM-dependent enzymes, including protein phosphatase 2B (PP2B, also called calcineurin). Increasing RCS phosphorylation blocked GPCR- and PP2B-mediated suppression of L-type Ca
2+
currents in striatal neurons. Conversely, genetic deletion of RCS significantly increased this modulation. Through a molecular mechanism that amplifies GPCR- and PKA-mediated signaling and attenuates GPCR- and PP2B-mediated signaling, RCS synergistically increases the phosphorylation of key proteins whose phosphorylation is regulated by PKA and PP2B.
A Precocial Avian Embryo from the Lower Cretaceous of China
Authors: Zhou Zhonghe , Zhang Fucheng
Published: October 2004

An embryo of an enantiornithine bird has been recovered from the Lower Cretaceous rocks of Liaoning, in northeast China. The bird has a nearly complete articulated skeleton with feather sheet impressions and is enclosed in egg-shaped confines. The tucking posture of the skeleton suggests that the embryo had attained the final stage of development. The presence of well-developed wing and tail feather sheets indicates a precocial developmental mode, supporting the hypothesis that precocial birds appeared before altricial birds.
Quantum-to-Classical Transition with Single-Photon-Added Coherent States of Light
Authors: Zavatta Alessandro , Viciani Silvia , Bellini Marco
Published: October 2004

Single-photon–added coherent states are the result of the most elementary amplification process of classical light fields by a single quantum of excitation. Being intermediate between a single-photon Fock state (fully quantum-mechanical) and a coherent (classical) one, these states offer the opportunity to closely follow the smooth transition between the particle-like and the wavelike behavior of light. We report the experimental generation of single-photon–added coherent states and their complete characterization by quantum tomography. Besides visualizing the evolution of the quantum-to-classical transition, these states allow one to witness the gradual change from the spontaneous to the stimulated regimes of light emission.
Systems Biology and New Technologies Enable Predictive and Preventative Medicine
Authors: Hood Leroy , Heath James R. , Phelps Michael E. , Lin Biaoyang
Published: October 2004

Systems approaches to disease are grounded in the idea that disease-perturbed protein and gene regulatory networks differ from their normal counterparts; we have been pursuing the possibility that these differences may be reflected by multiparameter measurements of the blood. Such concepts are transforming current diagnostic and therapeutic approaches to medicine and, together with new technologies, will enable a predictive and preventive medicine that will lead to personalized medicine.
Of Politics and Particle Physics
Authors: Pasachoff Jay M.
Published: October 2004

A Hole in Texas
A Novel. by Herman Wouk. Little, Brown, New York, 2004. 279 pp. $25, C$35. ISBN 0-316-52590-1.

Wouk explores the interface between science and politics in this novel about the Higgs boson and the aftermath of the 1993 cancellation of the Superconducting Super Collider.
BEHAVIOR OF PET FOIL USED AS BEAM EXTRACTION WINDOW DURING IRRADIATION AT ATMOSPHERIC PRESSURE
Authors: BARBOTTEAU Y. , ISHII K. , MIZUMA K. , YAMAZAKI H. , MATSUYAMA S. , SAKAI T. , SATOH T. , KAMIYA T.
Published: October 2004

Since biological or biomedical studies by nuclear microscopy are limited by irradiation damage, we developed an in-air system in order to cool down the biological samples by convection. The behavior of the beam extraction window is an important parameter of our system. Then, we investigated the behavior of a polyethylene teraphtalate (PET) thin-film used as beam extraction window during in-air irradiation by STIM (Scanning Transmission Ion Microscopy) and RBS (Rutherford Backscattering Spectrometry) methods. We found that it is better to flow helium than air atmosphere because in-air irradiation enhances the degradation of the PET film.
THE ELEMENTAL ANALYSIS OF IgE-SENSITIZED RBL-2H3 CELLS USING IN-AIR MICRO-PIXE
Authors: MIZUMA K. , ISHII K. , BARBOTTEAU Y. , ABE S. , YAMAZAKI H. , MATSUYAMA S. , SAKURAI E. , YANAI K. , KAMIYA T. , SAKAI T. , SATOH T. , OIKAWA M. , ARAKAWA K.
Published: October 2004

Rat basophilic leukaemia cells (RBL-2H3) were analyzed by in air micro-PIXE analysis to investigate the relationship between the distribution of elements and histamine release in immune system. RBL-2H3 cells were sensitized with monoclonal immunoglobuline E ( IgE ) and stimulated with antigen. In the stimulated cells, it is understood that the level of Ca 2+ increases in cytoplasm and then the degranulation or the release of chemical mediators occur. In this study, stimulated RBL-2H3 cells with antigen and control cells were analyzed. After the stimulation, the Na in the cells was increased. Moreover some stimulated cells showed the characteristic distribution of sulfur that is not accompany with the distribution of phosphorus. In the same measurement, the aggregations of Na , Ca , Fe , and Zn were observed.
HOPF ALGEBROIDS AND QUANTUM GROUPOIDS
Authors: LU JIANG-HUA
Published: October 2004

We introduce the notion of Hopf algebroids, in which neither the total algebras nor the base algebras are required to be commutative. We give a class of Hopf algebroids associated to module algebras of the Drinfeld doubles of Hopf algebras when the R-matrices act properly. When this construction is applied to quantum groups, we get examples of quantum groupoids, which have Poisson groupoids as their semi-classical limits. The example of quantum sl(2) is worked out in details.
BASIS OF THE DIAGRAM METHOD FOR GENERALIZED REFLECTION GROUPS IN LOBACHEVSKY SPACES AND ALGEBRAIC SURFACES WITH NEF ANTICANONICAL CLASS
Authors: NIKULIN VIACHESLAV V.
Published: October 2004

This paper contains basis of the diagram method for algebraic surfaces with nef anticanonical class (and generalized reflection groups in Lobachevsky spaces). Here the main problem is that Mori polyhedron may not be finite polyhedral. Before, this method was developed for Del Pezzo surfaces when Mori polyhedron is finite polyhedral. First, these results were published in Russian in our preprint [33, Secs. 1–3] in 1989.
FROM MULTIPLICATIVE UNITARIES TO QUANTUM GROUPS
Authors: WORONOWICZ S.L.
Published: October 2004

An alternative version of the theory of multiplicative unitaries is presented. Instead of the original regularity condition of Baaj and Skandalis we formulate another condition selecting manageable multiplicative unitaries. The manageability is the property of multiplicative unitaries coming from the quantum group theory. For manageable multiplicative unitaries we reproduce all the essential results of the original paper of Baaj and Skandalis and much more. In particular the existence of the antipode and its polar decomposition is shown.
ON THE q-COMPLETENESS OF CERTAIN HOLOMORPHICALLY SPREADABLE SPACES
Authors: TAN VO VAN
Published: October 2004

Let X be a [Formula: see text]-analytic space which is not necessarily of finite dimension and let us assume that X is holomorphically spreadable. In this paper, we prove that, in this situation, X is q-complete (resp. cohomologically q-complete) if and only if X is q-convex (resp. cohomologically q-convex) for any integer q≥1. Also, analogous problems within the framework of holomorphically convex spaces will be discussed.
A NOTE ON TOEPLITZ OPERATORS
Authors: GUENTNER ERIK , HIGSON NIGEL
Published: October 2004

We study Toeplitz operators on Bergman spaces using techniques from the analysis of Dirac-type operators on complete Riemannian manifolds, and prove an index theorem of Boutet de Monvel from this point of view. Our approach is similar to that of Baum and Douglas [2], but we replace boundary value theory for the Dolbeaut operator with much simpler estimates on complete manifolds.
OPEN PROBLEMS IN SOAP BUBBLE GEOMETRY
Authors: SULLIVAN JOHN M. , MORGAN FRANK
Published: October 2004

The Burlington Mathfest in August 1995 included an AMS Special Session on Soap Bubble Geometry, organized by Frank Morgan. At the end of the session, participants were asked to pose open problems related to bubble geometry. We have collected those problems here, adding a few introductory comments. Participants in the special session included the following:

Fred Almgren, Princeton U.

Megan Barber, Williams C.

Ken Brakke, Susquehanna U.

John Cahn, NIST

Joel Foisy, Duke U.

Christopher French, U.Chicago

Scott Greenleaf, SUNY Stony Brook

Karsten Groeß-Brauckmann, Bonn

Joel Hass, UC Davis

Aladár Heppes, Budapest

Michael Hutchings, Harvard U.

Jenny Kelley, Rutgers U.

Andy Kraynik, Sandia

Rob Kusner, U.Massachusetts

Rafael Lopez, Granada

Joe Masters, U.Texas

Helen Moore, Bowdoin C.

Frank Morgan, Williams C.

Ivars Peterson, Science News

Robert Phelan, Dublin

Joel Shore, McGill U.

John Sullivan, U.Minnesota

Italo Tamanini, Trento

Jean Taylor, Rutgers U.

Jennifer Tice, Williams C.

Brian Wecht, Williams C.

Henry Wente, U.Toledo

Brian White, Stanford U.
SZNAJD MODEL WITH "SOCIAL TEMPERATURE" AND DEFENDER ON SMALL-WORLD NETWORKS
Authors: HE MINGFENG , LI BEI , LUO LIDONG
Published: October 2004

The Sznajd model for the spread of opinions gives a good explanation of the influence among the neighbors, that is the external factor. In this paper, we add an internal factor to Sznajd model, which determines the probability of one's acceptance of other's opinion. We define this factor as social temperature, and we study the relationship between this temperature and time. We also consider the people who do not change their opinions as defenders and analyze their efforts.
A STUDY OF K–P INTERACTION AT HIGH ENERGY USING ADAPTIVE FUZZY INFERENCE SYSTEM INTERACTIONS
Authors: EL-BAKRY M. Y.
Published: October 2004

Adaptive Network Fuzzy Inference System (ANFIS) is an artificial intelligence (AI)-based technique that proved efficient in a variety of problems such as classification, recognition and modeling of complex systems. This paper utilizes the adaptive network fuzzy inference system to model the K–P interactions. The ANFIS-based K–P model simulates the multiplicity distribution of charged pions at different high energies. The results showed very accurate fitting to the experimental data recommending it to be a good alternative to other theoretical techniques.
Chemoprevention Against Hepatocellular Carcinoma ofCornus officinalis in vitro
Authors: Chang Jung-San , Chiang Lien-Chai , Hsu Fen-Fang , Lin Chun-Ching
Published: October 2004

The water extracts of Cornus officinalis Sieb. et Zuce against hepatocellular carcinoma (HCC) was studied for its chemopreventive potential. Three HCC cell lines (HepG2, SK-Hep1 and PLC/PRF/5) and three leukemic cell lines (U937, K562 and Raji) were tested with XTT assay. Extracts of C. officinalis inhibited all these HCC cells and leukemic cells at a concentration of 100 μg/ml (P<0.05) and was dose-dependent (P<0.0001). P53 (P<0.0001) and Ras (P=0.001) significantly affected its activity against HCC. Extracts of C. officinalis also possessed the anti-oxidant activity through free radicals scavenging activity at a concentration of 50 μg/ml (P<0.05). In summary, our experiment implied that C. officinalis might be a candidate for chemopreventive agent against HCC through the antioxidant and anti-neoplastic effects.
Intradermal Acupuncture on Shen-Men and Nei-Kuan Acupoints in Patients With Insomnia After Stroke
Authors: Kim Young Suk , Lee Sang Ho , Jung Woo Sang , Park Seong Uk , Moon Sang Kwan , Ko Chang Nam , Cho Ki Ho , Bae Hyung Sup
Published: October 2004

This is the first study that focuses on the effects of intradermal acupuncture on insomnia after stroke. We enrolled hospitalized stroke patients with insomnia and assigned them into a real intradermal acupuncture group (RA group) or a sham acupuncture group (SA group) by randomization. The RA group received intradermal acupuncture on Shen-Men (He-7) and Nei-Kuan (EH-6) for 2 days, and the SA group received sham acupuncture on the same points. The effectiveness was measured by the Morning Questionnaire (MQ), Insomnia Severity Index (ISI), and Athens Insomnia Scale (AIS). These scales were examined by an independent, blinded neurologist before, and 1 and 2 days after treatment, repeatedly. Thirty subjects (15 in the RA group and 15 in the SA group) were included in the final analysis. The RA group showed more improvement on insomnia than the SA group. Repeated measures analysis detected that there were significant between-subjects effects in the MQ, the ISI and the AIS. In conclusion, we suggest that intradermal acupuncture on Shen-Men and Nei-Kuan is a useful treatment for post stroke-onset insomnia.
A Birdcage Model for the Chinese Meridian System Part I: A Channel as a Transmission Line
Authors: Yung Kaung-Ti
Published: October 2004

The concept of Qi and the concept of channel are so closely related that they must be defined and comprehended simultaneously in a coordinated fashion. Once the nature of Qi is established in terms of physics, we may be able to explain the functional role that the channels play, as well as explain other Chinese medical terminology with a language of modern science. Based on the low electrical impedance characteristics of acupoints, we propose that the meridian channel is equivalent to an electromagnetic transmission line and the Qi is the electromagnetic (EM) standing wave riding on the line, with acupoints as its nodes. The standing wave within each segment of the channel separated by acupoints is in natural oscillation thus the segment may be analyzed as a λ/4 open circuit that behaves like a series RLC resonator. Acupuncture until De Qi is effectively equivalent to charging the capacitor C eq of the RLC resonator in the transmission line. The mechanism of bu and xie are charging or discharging the capacitor to bring the capacititive (or inductive) behavior of the segment back to that of the resonant state. Kirlian photograph may serve as a visual observation of the EM waves on channels.
DERIVATION OF CHIRAL ANOMALY IN LIGHT-FRONT QCD
Authors: WU MENG-HSIU
Published: October 2004

The chiral anomaly have been studied in light-front QCD. In this work, we use the gauge invariant point-splitting technique to derive the chiral anomaly in light-front QCD.
THE DILATATION OPERATOR OF $\mathcal{N}=4$ SYM AND CLASSICAL LIMITS OF SPIN CHAINS AND MATRIX MODELS
Authors: AGARWAL A. , RAJEEV S. G.
Published: October 2004

A study of the one-loop dilatation operator in the scalar sector of [Formula: see text] SYM is presented. The dilatation operator is analyzed from the point of view of Hamiltonian matrix models. A Lie algebra underlying operator mixing in the planar large-N limit is presented, and its role in understanding the integrability of the planar dilatation operator is emphasized. A classical limit of the dilatation operator is obtained by considering a contraction of this Lie algebra, leading to a new way of constructing classical limits for quantum spin chains. An infinite tower of local conserved charges is constructed in this classical limit purely within the context of the matrix model. The deformation of these charges and their relation to the charges of the spin chain is also elaborated upon.
NEUTRINOS: A BRIEF REVIEW
Authors: BILENKY S. M.
Published: October 2004

The major steps in the development of our knowledge about neutrinos are reviewed. The basics of neutrino oscillation formalism is presented. Neutrino oscillations in the framework of three-neutrino mixing are considered. The evidence for neutrino oscillations is discussed. Neutrinoless double β-decay is briefly considered.
EXACT QUANTUM STATES OF AN INVERTED PENDULUM UNDER TIME-DEPENDENT GRAVITATION
Authors: PEDROSA I. A. , GUEDES I.
Published: October 2004

We discuss the Lewis and Riesenfeld invariant method for cases where the invariant has continuous eigenvalues and use it to find the Schrödinger wave functions of an inverted pendulum under time-dependent gravitation. As a particular case, we consider an inverted pendulum with exponentially increasing mass and constant gravitation. We also obtain the exact solutions for a generalized time-dependent inverted pendulum.
FUNCTIONAL MODULARITY IN THE FUNDAMENTALS OF ECONOMIC THEORY: TOWARD AN AGENT-BASED ECONOMIC MODELING OF THE EVOLUTION OF TECHNOLOGY
Authors: CHEN SHU-HENG , CHIE BIN-TZONG
Published: October 2004

No matter how commonly the term innovation has been used in economics, a concrete analytical or computational model of innovation is not yet available. This paper argues that a breakthrough can be made with genetic programming, and proposes a functional-modularity approach to an agent-based computational economic model of innovation.
CONTROLLING THE ULTIMATE STATE OF PROJECTIVE SYNCHRONIZATION IN CHAOS: APPLICATION TO CHAOTIC ENCRYPTION
Authors: WANG BING-HONG , BU SHOULIANG
Published: October 2004

The ultimate state of projective synchronization is usually considered to be hardly controllable due to its close dependence on the initial conditions of both drive and response systems. In this letter, we show that the scaling factor of projective synchronization can be controlled to be proportional to a given scalar function with respect to time even without the knowledge of the initial conditions of response system. Further, we apply it to the chaotic encryption. Comparing with some existing implementations, it is found that the present scheme owns several remarkable advantages. To our knowledge, it is for the first time that the projective synchronization is applied to chaos-based encryption.
UNIVERSAL LENGTHS IN COMPLETE MICROBIAL GENOMES
Authors: CHEN T. Y. , HSIEH L. C. , CHANG C. H. , LUO L. F. , JI F. M. , LEE H. C.
Published: October 2004

Statistical analysis of frequency occurrence of short words in complete genomes reveals the existence of a set of universal lengths common to all extant complete microbial genomes. This phenomenon is consistent with a model for genome growth in which primitive genomes grew mainly by maximally stochastic duplications of short segments from an initial length of about 200 nucleotides. The relevance of these results to the so-called RNA world in which life began and evolved before the rise of proteins is discussed.
STATISTICAL PHYSICAL MODEL AND PROGRESS IN CONTROL METHODS OF BEAM HALO-CHAOS IN INTENSITY PROTON LINACS
Authors: FANG JIN-QING , ZHAO GENG , CHEN GUANRONG
Published: October 2004

Control of beam halo-chaos with complex space-time pattern in proton linacs has become one of key issues for future many important applications. This article offers a brief review for statistical physical model and advances in control methods. However, it is still an open challenging issue.
TWO-PHASE PHENOMENON IN FINANCIAL MARKETS
Authors: HU N. , ZHENG B. , QIU T.
Published: October 2004

The recently discovered two-phase phenomenon in financial markets [Nature421 (2003) 130] is examined with the German financial index DAX. Based on a realistic assumption, we introduce a dynamic feedback interaction to the Eguiluz–Zimmermann model [Phys. Rev. Lett.85 (2000) 5659]. Such an interaction generates a time correlation of volatility, and correctly produces the two-phase phenomenon.
DAMAGE OF HONEYBEE COLONIES AND NON-EQUILIBRIUM PERCOLATION PHASE TRANSITION
Authors: ZHANG PEIPEI , SU BEIBEI , HE DA-REN
Published: October 2004

Recently the mechanism of the damage caused by invasion of Apis mellifera capensis honeybee into the normal A. M. Scutellata colonies became interesting for scientists due to the fact that the mechanism may resemble those of cancer vicious hyperplasia, spreading of some epidemic, and turbulence of society induced by some bad society groups. We suggest a new guess that losing control of self-reproduction disturbs and throws information structure of the society into confuse. We simulate the damage process with a cellular automata based on the guess. The simulation shows that the process is equivalent to a non-equilibrium percolation phase transition. This discussion remind us that the management and monitor on the information network between society members may be a more effective way for avoiding the overflow of the destructor sub-colonies.
FLUID PERMEABILITY IN TWO-DIMENSIONAL PERCOLATION POROUS MEDIA
Authors: LIU ZHI-FENG , WANG XIAO-HONG
Published: October 2004

The scaling relations for the fluid permeability in percolation structures are numerically studied using both of the coarse numerical grid and the refined numerical grid. We suggest that the permeability for viscous fluid flows in two-dimensional lattice percolation porous media be equivalent to the conductivity problem in percolation theory, independent of the simulation refinements. The refined numerical grid does not lead to the new universality.
GROUND STATE ENERGIES OF HYDROGEN-LIKE IMPURITY IN A LENS-SHAPED QD
Authors: ZENG XIANGHUA , CHANG JIAFENG , ZHOU PENGXIA
Published: October 2004

In this paper,the ground state energies of hydrogen-like impurity in a lens-shaped quantum dot ( GaAs / In 1-x Ga x As ) under vertical magnetic field have been discussed by using effective mass approximation and variational method. It gives that for a lens-shaped quantum dot, due to the asymmetry of the vertical and lateral bound potentials, the electronic ground state energies are related not only with the deviation distance but also with the deviation direction; for the spherical quantum dot, the ground state energy is only related with the distance of the impurity deviation, neither with vertical nor lateral deviation. And with the increasing of the magnetic field, the ground state energy is increasing.
EVOLVING NETWORKS DRIVEN BY NODE DYNAMICS
Authors: FAN ZHENGPING , CHEN GUANRONG
Published: October 2004

In this paper, a new model of evolving networks is proposed based on the dynamical behaviors of nodes in the network. The probability that an existing node in the current network receives a new link from the newly added node is proportional to the defined "activity" of that particular node, which is equivalent to the energy signal of the system from a control theory point of view. This network is found to have the scale-free feature with the degree distribution in a power-law form. This model provides another explanation for the emergence of scale-free networks in many real-world examples.
SCALING LAW OF SARS ONSET
Authors: WU ZHONGLIANG
Published: October 2004

SARS onsets within different municipalities/provinces/autonomous regions of the Chinese mainland around April 20, 2003, when normalized by population, obeys a piece-wise Zipf distribution, implying that there are three main modes in the propagation of SARS. Extrapolation of the scaling relation gives that the range of the expected final cumulative SARS cases in Beijing would be 2170-2540. The real situation is 2522 at the end of June 2003.
EVALUATION OF SOME CALCULATED PARTIAL MULTIFRACTAL SPECTRA
Authors: CHEN HUIPING , SUN XIA , CHEN HUIXUAN , WU ZIQIN , WANG BINGHONG
Published: October 2004

Some parameters are introduced to evaluate the completeness of a partial multifractal spectrum with the shape of a bell or a hook, calculated using a statistical method due to a finite range of moment q. From the results of two kinds of Cantor sets, p/0/1-p and p/1-2p/p, and some examples of random fractals, it shows that the more homogeneous the probability distribution of the quantity studied is, the larger the range of q in the partial multifractal spectrum with the same evaluation parameters.
ISING MODEL ON A SMALL WORLD NETWORK
Authors: CAI TIAN-YI , LI ZHEN-YA
Published: October 2004

The properties of 2D Ising model on a small world network are investigated. It is found that Curie temperature increases with the increase of small world links. The relations between the Curie temperature and the concentration of small world links are found. The possibility of using Ising model to describe real network is discussed.
TEMPERATURE DEPENDENCE OF CONFIGURATIONAL ENTROPY ON STRUCTURAL RELAXATION FUNCTION IN GLASS-FORMING LIQUIDS
Authors: CAO WANQIANG , HU JUNLI
Published: October 2004

A direct correlation between the stretched exponent, β(T), of relaxation functions and configurational entropy of the Adam–Gibbs's theory on cooperatively rearranging region (CRR) in glass-forming liquids is investigated. One important result is that β(T) is equal to the relative configurational entropy per molecule. Another significant prediction is that β(T) is inversely proportional to the critical molecule number z*, of a CRR in the transformation. Further, a factor f(T) is proposed to express the temperature dependence of viscosity and configurational entropy. A modified Vogel-Fulcher–Tammann (VFT) equation is obtained by adding a small non-linear term to f(T). The above theoretic investigations coincide precisely with the calorimetric experimental results of 3-bromopentane.
SCALING THEORY FOR INTERMEDIARY-ACTIVATED MIGRATION PROCESSES
Authors: KE JIAN-HONG , LIN ZHEN-QUAN , ZHUANG YOU-YI
Published: October 2004

We study kinetic behavior of the growth of A aggregates through reversible migrations between the B intermediaries and the A aggregates. In a model with the migration rate kernels K(k;j)=K'(k;j)∝kujv (u,v≥0) at which monomers migrate from the aggregates Ak of size k to the B intermediaries of size j, we find that for all cases with 0≤u<2 and v>0, the size distribution of A aggregates always obeys the conventional scaling form. When v=0, A aggregates may scale according to a logarithm-correction form. Moreover, the typical aggregate size of A aggregates grows as tv/(2-u) in the v>0 case and as ( ln t)1/(2-u) in the v=0 case.
STATISTIC MECHANICS FOR LINEAR DEFECT-MEDIATED MELTING
Authors: LIU KEJIA , CHEN HUIFEN
Published: October 2004

The melting of elemental solids is modelled as a dislocation pair-mediated transition on a lattice. Statistical mechanics of linear defects is used to obtain the relation between melting temperature and shear modulus. It is derived theoretically that the phase transition is the first order and the formula for latent heat is also derived.
CHAOS-ASSISTED TUNNELING IN A TRIPLE-WELL POTENTIAL
Authors: BU SHOULIANG , WANG BING-HONG , JIANG PIN-QUN
Published: October 2004

The phenomenon of tunneling is well-known in quantum theory, however, many novel characteristics appear when the corresponding classical dynamics of the underlying system is chaotic. In this paper, the chaos-assisted tunneling is found in a triple-well potential under an external periodic driving field. We make use of the Husimi distribution to illustrate this characteristic in the quantum phase-space.
THE CHAOTIC CONTROL ON THE OCCASIONAL NONLINEAR TIME-DELAYED FEEDBACK
Authors: LI P. , LIU Y. Z. , HU K. L. , WANG B. H. , QUAN H. J.
Published: October 2004

The method of controlling chaos by occasional nonlinear time-delayed feedback is proposed. Through the numerical analysis of bifurcation diagram and Lyapunov exponent, we found that the systematic chaos can be controlled effectively by the nonlinear time-delayed feedback as the form of u(xn,xn-k)=cxnxn-k. Under the proper feedback coefficient c, time-delayed coefficient k and occasional feedback period N, the system could be controlled from chaos to the steady periodic orbit, and also the steady period is the integral multiple of the occasional feedback period N.
MODELING SARS SPREADING ON COMPLEX NETWORKS
Authors: YANG HUIJIE , ZHAO FANGCUI , LI ZHONGNAN , ZHANG WEI , ZHOU YUN
Published: October 2004

The spreading of SARS will destruct the initial network structure to a new phase, and in turn the spreading process will be weakened effectively and finally halted by this evolution of network structure. This mechanism is called immunity of contact network in this paper. What we can do is to accelerate effectively this process only.
MECHANOCHEMICAL COUPLING OF MOLECULAR MOTORS WITH NONCONSERVATIVE FORCE
Authors: ZHAO TONG-JUN , WANG YONG-HONG , AN HAI-LONG , ZHAN YONG , YAN WEI-LI , ZHUO YI-ZHONG
Published: October 2004

The biochemical process for coupling between hydrolysis of ATP and the performance of mechanical work involves a sequence of events. Here we present a two-dimensional ratchet model with a non-conservative impulsive force field. The non-conservative impulsive force that represents the chemical energy consumed in the conformation changing process provides a source of non-equilibrium fluctuation, which is a crucial factor for the Brownian motors and can lead to macroscopic motion.
SIMULATION STUDIES OF THE IMPURE ATOMS DIFFUSION ONCu(001) SURFACE
Authors: ZHUANG GUOCE
Published: October 2004

Based on the vacancy-assisted diffusion mechanism, the impure atomic moving processes on the close-packed layer of a Cu (001) surface are studied by kinetic Monte Carlo simulations. Our simulation results show that the diffusivity of the Indium atom agrees quite well with the exact lattice solution. In addition, it is found that in the case of muti-impure atoms, there exist a critical point near the value of ∊=0, and the diffusivity of In atom depends on the number of impure atoms only when ∊ is positive.
QUANTUM HALL FRACTIONS IN ULTRACOLD ATOMIC VAPORS
Authors: REGNAULT N. , JOLICOEUR TH.
Published: October 2004

Atomic vapors can be prepared and manipulated at very low densities and temperatures. When they are rotating, they can reach a quantum Hall regime in which there should be manifestations of the fractional quantum Hall effect. We discuss the appearance of the principal sequence of fractions ν=p/(p±1) for bosonic atoms. The termination point of this series is the paired Moore–Read Pfaffian state. Exotic states fill the gap between the paired state and the vortex lattice expected at high filling of the lowest Landau level. In fermionic vapors, the p-wave scattering typical of ultralow energy collisions leads to the hard-core model when restricted to the lowest Landau level.
ENERGY GAP IN HEISENBERG ANTIFERROMAGNETIC HALF-INTEGER SPIN CHAINS WITH LONG-RANGE INTERACTIONS
Authors: PARREIRA J. RODRIGO , BOLINA O. , PEREZ J. FERNANDO
Published: October 2004

We show that there is no gap in the excitation spectrum of antiferromagnetic chains with half-integer spins and long-range interactions provided the exchange function has a sufficiently rapid decay.
EQUATIONS FOR CORRELATION FUNCTIONS OF EIGHT-VERTEX MODEL: FERROMAGNETIC AND DISORDERED PHASES
Authors: YU. LASHKEVICH M.
Published: October 2004

The Kyoto group (Jimbo, Miwa, Nakayashiki et al.) has developed methods for calculating correlation functions of the eight-vertex model in antiferromagnetic phases. We extend these methods to ferromagnetic and disordered phases. We use Baxter’s symmetries to substantiate the validity of the analytical approach for these phases.
MICROWAVE ABSORPTION STUDIES ON V-B GROUP METAL OXIDES DOPED Bi(Pb)-2223 CERAMIC SUPERCONDUCTOR
Authors: SUBHASH P. , RAO G. NARSINGA , BABU D. SURESH
Published: October 2004

Microwave absorption studies have been carried out on samples Bi 1.6 Pb 0.3 V 0.1 Sr 2· Ca 2 Cu 3 O y, Bi 1.6 Pb 0.3 Nb 0.1 Sr 2 Ca 2 Cu 3 O y, and Bi 1.6 Pb 0.3 Ta 0.1 Sr 2 Ca 2 Cu 3 O y. DC Microwave absorption studies of all the samples showed the presence of single 2223 phase. Variation of Low Field Microwave Absorption (LFMA) signal amplitude of these samples showed definite peaks at 95 K, 83 K and 90 K respectively. The temperature dependent average Josephson loop diameter was estimated for all these samples. The experimental data was analyzed on the basis of Josephson Medium Model. From this model, the temperature dependent junction penetration depth λ j , Josephson junction upper and lower critical fields H C1j and H C2j and Josephson junction critical current densities J Cj were estimated.
CORRELATED-ELECTRON THEORY OF METAMAGNETISM IN STRONGLY ANISOTROPIC ANTIFERROMAGNETS
Authors: HELD K. , ULMKE M. , VOLLHARDT D.
Published: October 2004

The electronic origin of metamagnetism in strongly anisotropic antiferromagnets is examined. To this end the infinite-dimensional Hubbard model with easy axis is investigated both analytically and numerically. At weak coupling a first order transition and at strong coupling a second order phase transition is found. To determine the transition behavior at intermediate coupling Quantum Monte Carlo techniques are used to calculate the field versus temperature phase diagram. The apparent similarities to the phase diagram of FeBr 2 and to mean field results for the Ising model with competing interactions are discussed.
CHARACTERIZATION SEVERAL NOVEL PHASE TRANSITIONS IN A UNIQUE LOWER DIMENSION SYSTEM OF FREE-STANDING LIQUID-CRYSTAL FILMS
Authors: JIN A.J. , VEUM M. , CHOU C.F. , HO J.T. , SURENDRANATH V. , STOEBE T. , HUI S.W. , HUANG C.C.
Published: October 2004

Motivated by the defect-mediated two-stage melting theory, extensive experiments have been concluded on free-standing films of a liquid-crystal sample which exhibits the isotropic-smectic-A–hexatic B-crystal-B bulk phase sequence. For a two-layer film, which is virtually two-dimensional, our calorimetric measurement shows an apparently divergent anomaly near the smectic-A-hexatic-B transition. Its anomaly has a dominant fluctuation contribution and can be fitted to a power law with an exponent α≈0.37±0.05, in disagreement with the theoretical prediction. Thicker films exhibit surface-initiated layer-by-layer (LBL) wetting transition upon cooling. Moreover, these films also exhibit interesting LBL thinning transitions above the bulk clearing temperature.
OPTICAL DIFFRACTION IN CHIRAL LIQUID CRYSTALS
Authors: SURESH K.A. , SAH YUVARAJ
Published: October 2004

Optical diffraction in the phase grating mode of twisted liquid crystalline media has been considered. In particular, the recent advances in this area have been emphasised.
PINNING OF A SOLID–LIQUID–VAPOR INTERFACE
Authors: ANDERSEN JØRGEN VITTING
Published: October 2004

We propose a macroscopic Hamiltonian approach to study the pinning (sticking) of a solid–liquid–vapor contact line by pinning centers on the solid. We have so far studied the case of a vertical solid immersed into a liquid in the presence of gravity, but the method is general and can easily be extended to other geometries with and without gravity. Using computer simulations the method can be used to give a nonperturbative estimate for whether pinning centers interact cooperatively or independently in the pinning of the contact line.
QUANTUM WAVEGUIDE THEORY FOR A MESOSCOPIC RING SUBJECT TO THE AHARONOV–CASHER EFFECT
Authors: RYU CHANG-MO , CHOI TAESEUNG , KIM CHUL KOO , NAHM KYUN
Published: October 2004

A one-dimensional quantum waveguide theory is developed for a mesoscopic ring subject to the Aharonov–Casher(AC) effect based on the SU (2) spin gauge theory. The quantum interference by the AC effect is found to be equivalent to that by the Aharonov–Bohm(AB) effect. This indicates that AC effect can be utilized for device application in a very similar manner to the AB effect. The transmission probability induced by the AC effect is shown to be identical for the spin up and down components.
VORTEX PINNING AND CRITICAL CURRENTS IN JOSEPHSON JUNCTION ARRAYS WITH DEFECTS
Authors: DATTA SUJAY , DAS SHANTILAL , SAHDEV DESHDEEP , MEHROTRA RAVI
Published: October 2004

We develop an algorithm based on the Fast Cosine Transform to study two-dimensional arrays of Josephson junctions containing defects. We apply it to arrays as large as 128 × 256 and study vortex pinning, the transition from the superconducting to the resistive state, and various finite size effects. We find that the pinning potential for vortices is highly anisotropic in rectangular arrays due to boundaries and finite size effects. As a result we observe pinned vortices in arrays much smaller than expected so far. The energy of an array changes discontinuously at transitions from one vortex sector to another in the steady-state regime.
GENERALIZED FRACTIONAL STATISTICS
Authors: KANIADAKIS G. , LAVAGNO A. , QUARATI P.
Published: October 2004

We link, by means of a semiclassical approach, the fractional statistics of particles obeying the Haldane exclusion principle to the Tsallis statistics and derive a generalized quantum entropy and its associated statistics.
A USEFUL REPRESENTATION FOR STUDYING QUANTUM HALL EFFECT
Authors: FAN HONG-YI , REN YONG
Published: October 2004

We show that the complete and orthonormal representation 〈λ|, which is constructed in terms of guiding centers and canonical momenta for describing the coordinate of an electron in a uniform magnetic field, provides us with a direct algebraic approach to deriving the correct wave functions for studying quantum Hall effect. The squeezing transformation for electron’s motion radius in the 〈λ| representation is also discussed, normally ordered squeezing operators are derived by virtue of the technique of integration within an ordered product of operators.
SYMPLECTIC STRUCTURES AND QUANTUM MECHANICS
Authors: MARMO GIUSEPPE , VILASI GAETANO
Published: October 2004

Canonical coordinates for the Schrödinger equation are introduced, making more transparent its Hamiltonian structure. It is shown that the Schrödinger equation, considered as a classical field theory, shares with Liouville completely integrable field theories the existence of a recursion operator which allows for the infinitely many conserved functionals pairwise commuting with respect to the corresponding Poisson bracket.

The approach may provide a good starting point to get a clear interpretation of Quantum Mechanics in the general setting, provided by Stone–von Neumann theorem, of Symplectic Mechanics. It may give new tools to solve in the general case the inverse problem of quantum mechanics whose solution is given up to now only for one-dimensional systems by the Gel’fand-Levitan-Marchenko formula.
SYNTHESIS OF HIGH QUALITY CRYSTALLINE C-N FILMS ON SILICON
Authors: CHEN YAN , WANG E.G. , CHEN FENG , GUO LIPING
Published: October 2004

High quality crystalline C–N films have been synthesized via hot filament chemical vapor deposition using a gas mixture of nitrogen and methane. Scanning electron microscopy images show that a high density of crystalline clusters has been achieved. The clusters are composed of small columnar crystals (20–200 nm across) with hexagonal facets. Energy dispersive X ray analysis indicates a relative nitrogen:carbon composition of 1.30–2.5. X ray diffraction results indicate the films composed of β- and α- C 3 N 4 phases. Together with transmission electron microscopy analyses, we suggest that an interfacial layer C 3−x Si x N 4 is formed between the silicon substrate and the crystalline carbonnitride films.
DIRECT OBSERVATION OF C3N4 SINGLE CRYSTAL BY SCANNING ELECTRON MICROSCOPY
Authors: CHEN YAN , GUO LIPING , WANG E.G.
Published: October 2004

We report the first experimental observation of C3N4 single crystals, which are about tens nanometers to several micrometers in length and hundreds nanometers in across, by scanning electron microscopy. The pure crystalline C-N solids with α- and β-phases were grown on nickel substrates by bias-assisted hot filament chemical vapor deposition (bias-HFCVD). Our experimental results are in very good agreement with recent first-principles calculations.
TWO-COMPONENT ALLOY MODEL FOR BISMUTHATE CERAMICS
Authors: KUZEMSKY A.L.
Published: October 2004

The disordered binary substitutional A 1−x B x alloy model has been proposed for the description of the normal and superconducting properties of bismuthate ceramics Ba(Pb,Bi)O 3. The Eliashberg-type equations for the strong coupling superconductivity in strongly disordered alloys have been used to describe the superconducting properties. The relevant configurational averaging has been performed in the framework of CPA. The concentration dependence of electron-phonon coupling constant λ(x) and transition temperature Tc(x) has been calculated.
A NEW UNIVERSALITY CLASS DESCRIBING THE INSULATING REGIME OF DISORDERED WIRES WITH STRONG SPIN-ORBIT SCATTERING
Authors: CASELLE M.
Published: October 2004

We discuss the distribution of transmission eigenvalues in the strongly localized regime in the presence of both a magnetic field and spin-orbit scattering. We show that, under suitable conditions, this distribution can be described by a new universality class labelled not only by the index β but also by a new index η. This result is obtained by mapping the problem into that of a suitable Calogero-Sutherland model.
TEMPERATURE AND PRESSURE DEPENDENCE OF ELASTIC PROPERTIES OF EARTH’S LOWER MANTLE COMPONENTS
Authors: BEDI S.S. , BHANGOO M.S.
Published: October 2004

The expressions for the temperature and pressure derivatives of Second Order Elastic (SOE) constants of elements of earth’s lower mantle i.e. CaO, MgO and SrO have been obtained using a simple method of direct differentiation of expressions of SOE constants which have been suitably modified taking into account three body interaction and thermal phonon pressure. The method provides a direct check to the already known expressions of pressure derivatives of SOE constants using Thurston and Brugger relation. The results obtained at 300° K are found to be in reasonably good agreement with the experiment.
MAGNETOPLASMA OSCILLATIONS OF A TWO-DIMENSIONAL, TWO-COMPONENT PLASMA
Authors: KHANH NGUYEN QUOC
Published: October 2004

We investigate the magnetoplasma excitations in a system comprised of two parallel two-dimensional conducting layers separated by a distance 2d>0. The individual layers are assumed to have, in general, different effective masses, particle densities and charges. The dispersion equations are derived quantum mechanically within the random phase approximation and the spectrum of the long wavelength collective modes is calculated. We also investigate the mutual phase of two-dimensional magnetoplasma oscillations and show that this mutual phase is similar to that in the three-dimensional case and does not depend on the interlayer distance.
LANDAU-DE GENNES MODEL WITH THE INCLUSION OF DENSITY CHANGE FOR THE NEMATIC-ISOTROPIC PHASE TRANSITION
Authors: NANDI B. , MUKHERJEE P.K. , SAHA M.
Published: October 2004

The Landau-de Gennes model of the nematic-isotropic phase transition with the inclusion of the density change and a higher order term (sixth-order term) in a simple way is examined. The temperature difference T NI −T* obtained is in good agreement with the experimental one. We also obtained the value of the ratio (Q*–Q NI )/Q NI . The value of (Q*–Q NI )/Q NI is not improved over the earlier attempt, but there is a definite improvement in the value of T NI –T* which is obtained as 1.045 K.
TWO-COMPONENT SUPERCONDUCTIVITY FOR DOPED FULLERENES
Authors: LU JING , ZHANG LIYUAN
Published: October 2004

The combining mechanism of the itinerant carrier pair and the local carrier pair (two-component model) is considered for doped fullerenes. The superconducting transition temperature T c , penetration depth λ, coherent length ξ, thermodynamic critical field H c and specific heat jump ΔC/T c are calculated and there is overall consistency between the calculations and the experiments for both alkali-metal-doped fullerenes ( Na 3 C 60, K 3 C 60, Rb 3 C 60 and RbCs 2 C 60) and alkaline-earth doped fullerenes ( Ba 6 C 60).
EFFECT OF Ca SUBSTITUTION ON THE SUPERCONDUCTIVITY IN Y1−xCaxBa2Cu3O7−y(y≈0) SYSTEM: A NEUTRON DIFFRACTION STUDY
Authors: AWANA V.P.S. , MALIK S.K. , YELON W.B.
Published: October 2004

Superconductivity and structural aspects of Y 1−x Ca x Ba 2 Cu 3 O 7−y high-T c cuprate superconductor near y≈0 have been investigated. The superconducting transition temperature, T c , decreases with increasing Ca 2+ substitution at Y 3+ site in this system. A detailed structural analysis of the system has been carried out through neutron diffraction studies. On partial replacement of Y by Ca , the oxygen content of the system decreases slightly. The in-plane Cu (2)– O (2) bond distance increases with an increased Cu (2)– O (2)– Cu (2) angle, while the bond distances in Cu – O chains are found to decrease. These structural refinement results particularly increased Cu (2)– O (2) indicate that the increase of holes in Cu – O planes due to partial replacement of Y 3+ by Ca 2+ is unlikely to happen in the present situation, implying that the decrease in T c on Ca substitution in this system is not due to overdoping effects.
METAL-INSULATOR TRANSITION IN THE HUBBARD MODEL
Authors: MONTORSI ARIANNA , RASETTI MARIO
Published: October 2004

We study the metal-insulator transition of the d-dimensional Hubbard model by treating the hopping term between adjacent 1-d chains in the frame of a Clifford linearization scheme, and keeping the full model along the chains. A general equation for the critical point is worked out in terms of the correlation functions of the one-dimensional model, assuming that the transition is of the second order. The equation, which holds at any temperature, is here investigated especially at T=0, where the latter condition holds true. The solution shows the existence of an insulating ground state in any d only at half-filling for U strictly positive, as in the exact 1-d case. The transition is found to be related to a parameter reminiscent of entropy.
ANOMALOUS STATE OF ICE
Authors: LO SHUI-YIN
Published: October 2004

Anomalous state of ice, which is a novel stable structures made from water molecules, can be induced to form under the action of ions in very dilute solutions, perhaps from a similar physical mechanism that forms ice VI. These stable structures change the UV transmission characteristic of water. Different structures formed from different ions are shown to have similar UV transmission characteristics. These structures can be filtered, concentrated and photographed using a transmission electron-microscope. A dipole-dipole interaction model is constructed to suggest an explanation of the elongated shape of these structures.
GENERALIZED DEFORMED OSCILLATOR FOR VORTICES IN SUPERFLUID FILMS
Authors: BONATSOS DENNIS , DASKALOYANNIS C.
Published: October 2004

The algebra of observables of a system of two identical vortices in a superfluid thin film is described as a generalized deformed oscillator with a structure function containing a linear (harmonic oscillator) term and a quadratic term. In contrast to the deformed oscillators occurring in other physical systems (correlated fermion pairs in a single-j nuclear shell, Morse oscillator), this oscillator is not amenable to perturbative treatment and cannot be approximated by quons. From the mathematical viewpoint, this oscillator provides a novel boson realization of the algebra su (1,1).
CRITICAL DYNAMICS OF THE XY-MODEL ON THE ONE-DIMENSIONAL SUPERLATTICE BY POSITION SPACE RENORMALIZATION GROUP
Authors: LIMA J.P. DE , GONÇALVES L.L.
Published: October 2004

The critical dynamics of the isotropic XY-model on the one-dimensional superlattice is considered in the framework of the position space renormalization group theory. The decimation transformation is introduced by considering the equations of motion of the operators associated to the excitations of the system, and it corresponds to an extension of the procedure introduced by Stinchcombe and dos Santos (J. Phys. A18, L597 (1985)) for the homogeneous lattice. The dispersion relation is obtained exactly and the static and dynamic scaling forms are explicitly determined. The dynamic critical exponent is also obtained and it is shown that it is identical to the one of the XY-model on the homogeneous chain.