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4.0

Jun 30, 2018
06/18

by
David Y Gao

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This paper presents a pure complementary energy variational method for solving anti-plane shear problem in finite elasticity. Based on the canonical duality-triality theory developed by the author, the nonlinear/nonconex partial differential equation for the large deformation problem is converted into an algebraic equation in dual space, which can, in principle, be solved to obtain a complete set of stress solutions. Therefore, a general analytical solution form of the deformation is obtained...

Topics: Mathematics, Analysis of PDEs, Optimization and Control

Source: http://arxiv.org/abs/1402.6025

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Jun 28, 2018
06/18

by
David Y. Gao

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This paper revisits a well-studied anti-plane shear deformation problem formulated by Knowles in 1976 and analytical solutions in general nonlinear elasticity proposed by Gao since 1998. Based on minimum potential principle, a well-determined fully nonlinear system is obtained for isochoric deformation, which admits non-trivial states of finite anti-plane shear without ellipticity constraint. By using canonical duality theory, a complete set of analytical solutions are obtained for 3-D finite...

Topics: Mathematical Physics, Mathematics

Source: http://arxiv.org/abs/1507.08748

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Sep 22, 2013
09/13

by
Y. Gao; D. Marfatia

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We explore the sensitivity of an experiment at the Daya Bay site, with a point radioactive source and a few meter baseline, to neutrino oscillations involving one or more eV mass sterile neutrinos. We find that within a year, the entire 3+2 and 1+3+1 parameter space preferred by global fits can be excluded at the 3\sigma level, and if an oscillation signal is found, the 3+1 and 3+2 scenarios can be distinguished from each other at more than the 3\sigma level provided one of the sterile...

Source: http://arxiv.org/abs/1302.5725v2

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Sep 23, 2013
09/13

by
J. Culberson; Y. Gao

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In this paper, we study the possibility of designing non-trivial random CSP models by exploiting the intrinsic connection between structures and typical-case hardness. We show that constraint consistency, a notion that has been developed to improve the efficiency of CSP algorithms, is in fact the key to the design of random CSP models that have interesting phase transition behavior and guaranteed exponential resolution complexity without putting much restriction on the parameter of constraint...

Source: http://arxiv.org/abs/1110.2204v1

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Sep 21, 2013
09/13

by
J. Culberson; Y. Gao

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In this paper, we analyze the decision version of the NK landscape model from the perspective of threshold phenomena and phase transitions under two random distributions, the uniform probability model and the fixed ratio model. For the uniform probability model, we prove that the phase transition is easy in the sense that there is a polynomial algorithm that can solve a random instance of the problem with the probability asymptotic to 1 as the problem size tends to infinity. For the fixed ratio...

Source: http://arxiv.org/abs/1106.4575v1

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3.0

Jun 29, 2018
06/18

by
Zhong Jin; David Y Gao

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This paper presents a canonical d.c. (difference of canonical and convex functions) programming problem, which can be used to model general global optimization problems in complex systems. It shows that by using the canonical duality theory, a large class of nonconvex minimization problems can be equivalently converted to a unified concave maximization problem over a convex domain, which can be solved easily under certain conditions. Additionally, a detailed proof for triality theory is...

Topics: Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1607.03426

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Sep 22, 2013
09/13

by
Nig Ruan; David Y Gao

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Sensor network localization problem is to determine the position of the sensor nodes in a network given pairwise distance measurements. Such problem can be formulated as a polynomial minimization via the least squares method. This paper presents a canonical duality theory for solving this challenging problem. It is shown that the nonconvex minimization problem can be reformulated as a concave maximization dual problem over a convex set in a symmetrical matrix space, and hence can be solved...

Source: http://arxiv.org/abs/1302.3673v1

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3.0

Jun 29, 2018
06/18

by
Zhong Jin; David Y Gao

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We study a canonical duality method to solve a mixed-integer nonconvex fourth-order polynomial minimization problem with fixed cost terms. This constrained nonconvex problem can be transformed into a continuous concave maximization dual problem without duality gap. The global optimality conditions are proposed and the existence and uniqueness criteria are discussed. Application to a decoupled mixed-integer problem is illustrated and analytic solution for a global minimum is obtained under some...

Topics: Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1607.04748

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Sep 23, 2013
09/13

by
David Y Gao; Changzhi Wu

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This paper presents a detailed proof of the triality theorem for a class of fourth-order polynomial optimization problems. The method is based on linear algebra but it solves an open problem on the double-min duality left in 2003. Results show that the triality theory holds strongly in a tri-duality form if the primal problem and its canonical dual have the same dimension; otherwise, both the canonical min-max duality and the double-max duality still hold strongly, but the double-min duality...

Source: http://arxiv.org/abs/1110.0293v1

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Sep 21, 2013
09/13

by
David Y. Gao; Changzhi Wu

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Triality theory is proved for a general unconstrained global optimization problem. The method adopted is simple but mathematically rigorous. Results show that if the primal problem and its canonical dual have the same dimension, the triality theory holds strongly in the tri-duality form as it was originally proposed. Otherwise, both the canonical min-max duality and the double-max duality still hold strongly, but the double-min duality holds weakly in a super-symmetrical form as it was...

Source: http://arxiv.org/abs/1104.2970v2

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Sep 21, 2013
09/13

by
David Y. Gao; Jiapu Zhang

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This paper presents a canonical duality theory for solving nonconvex minimization problem of Rosenbrock function. Extensive numerical results show that this benchmark test problem can be solved precisely and efficiently to obtain global optimal solutions.

Source: http://arxiv.org/abs/1108.1241v2

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Sep 23, 2013
09/13

by
K. Y. Gao; CLEO Collaboration

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Based on a data sample of 60 pb-1 collected at the psi(3770) resonance with the CLEO-c detector at CESR, we present improved measurements of absolute branching fractions for exclusive D0 semileptonic decays into K- e+ nu, pi- e+ nu and K*- e+ nu; and the first observation and absolute branching fraction measurement of D0 to rho- e+ nu.

Source: http://arxiv.org/abs/hep-ex/0408077v1

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Sep 22, 2013
09/13

by
V. Barger; Y. Gao; D. Marfatia

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With the augmentation of IceCube by DeepCore, the prospect for detecting dark matter annihilation in the Sun is much improved. To complement this experimental development, we provide a thorough template analysis of the particle physics issues that are necessary to precisely interpret the data. Our study is about nitty-gritty and is intended as a framework for detailed work on a variety of dark matter candidates. To accurately predict the source neutrino spectrum, we account for spin...

Source: http://arxiv.org/abs/1101.4410v2

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Sep 18, 2013
09/13

by
V. Barger; Y. Gao; D. Marfatia

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We test if the latest Gold set of 182 SNIa or the combined "Platinum" set of 192 SNIa from the ESSENCE and Gold sets, in conjunction with the CMB shift parameter show a preference between the LambdaCDM model, three wCDM models, and the DGP model of modified gravity as an explanation for the current accelerating phase of the universe's expansion. We consider flat wCDM models with an equation of state w(a) that is (i) constant with scale factor $a$, (ii) varies as w(a)=w_0+w_a(1-a) for...

Source: http://arxiv.org/abs/astro-ph/0611775v3

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Sep 23, 2013
09/13

by
V. Barger; Y. Gao; D. Marfatia

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Data from the LSND and MiniBooNE experiments, and revised expectations of the antineutrino flux from nuclear reactors suggest the existence of eV-mass sterile neutrinos. 3+2 and 1+3+1 scenarios accommodate all relevant short-baseline neutrino data except for the low-energy MiniBooNE anomaly. We analyze the angular distribution of upward going atmospheric neutrino events in the IceCube-40 dataset for evidence of sterile neutrinos within these scenarios. Depending on how systematic uncertainties...

Source: http://arxiv.org/abs/1109.5748v2

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6.0

Jun 30, 2018
06/18

by
X. Y. Gao; J. L. Han

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Large-scale radio continuum surveys have good potential for discovering new Galactic supernova remnants (SNRs). Surveys of the Galactic plane are often limited in the Galactic latitude of |b| ~ 5 degree. SNRs at high latitudes, such as the Cygnus Loop or CTA~1, cannot be detected by surveys in such limited latitudes. Using the available Urumqi 6 cm Galactic plane survey data, together with the maps from the extended ongoing 6 cm medium latitude survey, we wish to discover new SNRs in a large...

Topics: Astrophysics of Galaxies, Astrophysics

Source: http://arxiv.org/abs/1406.3902

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Sep 20, 2013
09/13

by
Y. Gao; I. Kontoyiannis; E. Bienenstock

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Partly motivated by entropy-estimation problems in neuroscience, we present a detailed and extensive comparison between some of the most popular and effective entropy estimation methods used in practice: The plug-in method, four different estimators based on the Lempel-Ziv (LZ) family of data compression algorithms, an estimator based on the Context-Tree Weighting (CTW) method, and the renewal entropy estimator. **Methodology. Three new entropy estimators are introduced. For two of the four...

Source: http://arxiv.org/abs/0802.4363v1

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6.0

Jun 30, 2018
06/18

by
K. Bennaceur; J. Dobaczewski; Y. Gao

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We present results of the Hartree-Fock-Bogolyubov calculations performed using nuclear energy density functionals based on regularized functional generators at next-to-leading and next-to-next-to-leading order. We discuss properties of binding energies and pairing gaps determined in semi-magic spherical nuclei. The results are compared with benchmark calculations performed for the functional generator SLyMR0 and functional UNEDF0.

Topic: Nuclear Theory

Source: http://arxiv.org/abs/1701.08062

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3.0

Jun 28, 2018
06/18

by
Y. Gao; J. Dobaczewski; P. Toivanen

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Background: Nuclear self-consistent mean-field approaches are rooted in the density functional theory and, through the spontaneous symmetry breaking mechanism, allow for including important correlations, while keeping the simplicity of the approach. Because real ground states should have all symmetries of the nuclear Hamiltonian, these methods require subsequent symmetry restoration. Purpose: We implement and study Lipkin method of approximate variation after projection applied to the...

Topic: Nuclear Theory

Source: http://arxiv.org/abs/1511.02814

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Sep 23, 2013
09/13

by
X. Y. Gao; J. L. Han

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The Origem Loop in the Galactic anticentre was discovered in 1970s and suggested to be a large supernova remnant. It was argued later to be a chance superposition of unrelated radio sources. We attempt to understand the properties of the Origem Loop. Available multi-frequency radio data were used for the determination of radio spectra of different parts of the Origem Loop and the polarization properties of the loop. Newly available sensitive observations show that the Origem Loop is a loop of...

Source: http://arxiv.org/abs/1212.1523v1

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Sep 22, 2013
09/13

by
D. M. Morales Silva; D. Y. Gao

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General nonconvex optimization problems are studied by using the canonical duality theory. The triality theory is proved for sums of exponentials and quartic polynomials, which solved an open problem left in 2003. This theory can be used to find the global minimum and local extrema. Detailed applications are illustrated by several examples.

Source: http://arxiv.org/abs/1210.0180v1

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Sep 18, 2013
09/13

by
V. Barger; Y. Gao; Wai-Yee Keung

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$\cal T$-parity in the Little Higgs model could be violated by anomalies that allow the lightest $\cal T$-odd $A_H$ to decay into $ZZ$ and $W^+W^-$. We analyze these anomaly induced decays and the two-particle and the three-particle decay modes of other heavy quarks and bosons in this model which yield unique Large Hadron Collider (LHC) signals with fully reconstructable events. $\cal T$-odd quarks in the Little Higgs model are nearly degenerate in mass and they decay by almost identical...

Source: http://arxiv.org/abs/0707.3648v3

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Jul 20, 2013
07/13

by
Jiapu Zhang; David Y. Gao; Johh Yearwood

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Many experimental studies have shown that the prion AGAAAAGA palindrome hydrophobic region (113-120) has amyloid fibril forming properties and plays an important role in prion diseases. However, due to the unstable, noncrystalline and insoluble nature of the amyloid fibril, to date structural information on AGAAAAGA region (113-120) has been very limited. This region falls just within the N-terminal unstructured region PrP (1-123) of prion proteins. Traditional X-ray crystallography and nuclear...

Source: http://arxiv.org/abs/1107.4104v1

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4.0

Jun 30, 2018
06/18

by
David Y Gao; Ning Ruan; Vittorio Latorre

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Canonical duality-triality is a breakthrough methodological theory, which can be used not only for modeling complex systems within a unified framework, but also for solving a wide class of challenging problems from real-world applications. This paper presents a brief review on this theory, its philosophical origin, physics foundation, and mathematical statements in both finite and infinite dimensional spaces, with emphasizing on its role for bridging the gap between nonconvex analysis/mechanics...

Topics: Mathematics, Mathematical Physics

Source: http://arxiv.org/abs/1410.2665

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Sep 23, 2013
09/13

by
C. Z. Fan; Y. Gao; J. P. Huang

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According to a first-principles approach, we clarify electric cloaks universality concerning a new class of phase transitions between negative pathway (NGP) and normal pathway of electric displacement fields, which are driven by the geometric shape of the cloak. We report that the NGP arises from shape-enhanced strong negative electric polarization, and that it is related to a symmetric oscillation of the paired electric permittivities, which are shown to satisfy a sum rule. The NGP does not...

Source: http://arxiv.org/abs/0801.4056v1

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Sep 21, 2013
09/13

by
Vernon Barger; Y. Gao; Mathew McCaskey; Gabe Shaughnessy

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A light Higgs boson is preferred by $M_W$ and $m_t$ measurements. A complex scalar singlet addition to the Standard Model allows a better fit to these measurements through a new light singlet dominated state. It then predicts a light Dark Matter (DM) particle that can explain the signals of DM scattering from nuclei in the CoGeNT and DAMA/LIBRA experiments. Annihilations of this DM in the galactic halo, $AA\rightarrow b\bar{b}, c\bar{c}, \tau^+\tau^-$, lead to gamma rays that naturally improve...

Source: http://arxiv.org/abs/1008.1796v1

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Sep 18, 2013
09/13

by
X. M. Zhao; B. Jia; Z. Y. Gao

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In this study, we provide a novel approach for modelling the mixed traffic flow. The basic idea is to integrate models for nonmotorized vehicles (nm-vehicles) with models for motorized vehicles (m-vehicles). Based on the idea, a model for mix traffic flow is realized in in the following two steps. At a first step, the models that can be integrated should be chosen. The famous NaSch cellular automata (NCA) model for m-vehicles and the Burgur cellular automata (BCA) model for nm-vehicles are used...

Source: http://arxiv.org/abs/0707.1169v1

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Sep 18, 2013
09/13

by
W. van Driel; Y. Gao; D. Monnier-Ragaigne

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A total of 19 luminous infrared galaxy mergers, with L_IR~2 10^11 L_sun for H_0=75 km/s/Mpc, have been observed in the HI line at Nancay and four of them were observed at Arecibo as well. Of these 19, ten had not been observed before. Six were clearly detected, one of which for the first time. The objective was to statistically sample the \HI gas mass in luminous infrared mergers along a starburst merger sequence where the molecular CO gas content is already known.

Source: http://arxiv.org/abs/astro-ph/0101003v1

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Sep 18, 2013
09/13

by
Y. C. Jian; Y. Gao; J. P. Huang

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Taking into account the structural transition and long-range interaction (lattice effect), we resort to the Ewald-Kornfeld formulation and developed Maxwell-Garnett theory for uniaxially anisotropic suspensions to calculate the effective permeability of inverse ferrofluids. And we also consider the effect of volume fraction to the magnetophoretic force on the nonmagnetic spherical particles submerged in ferrofluids in the presence of nonuniform magnetic field. We find that the coupling of ac...

Source: http://arxiv.org/abs/cond-mat/0611367v1

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40

Sep 23, 2013
09/13

by
William Y. C. Chen; Henry Y. Gao; Jia He

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In this paper, we extend the notion of labeled partitions with ordinary permutations to colored permutations in the sense that the colors are endowed with a cyclic structure. We use labeled partitions with colored permutations to derive the generating function of the $\mathrm{fmaj}_k$ indices of colored permutations. The second result is a combinatorial treatment of a relation on the q-derangement numbers with respect to colored permutations which leads to the formula of Chow for signed...

Source: http://arxiv.org/abs/0810.3388v1

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Jul 20, 2013
07/13

by
X. Y. Lai; C. Y. Gao; R. X. Xu

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The study of dense matter at ultra-high density has a very long history, which is meaningful for us to understand not only cosmic events in extreme circumstances but also fundamental laws of physics. It is well known that the state of cold matter at supra-nuclear density depends on the non-perturbative nature of quantum chromo-dynamics (QCD) and is essential for modeling pulsars. A so-called H-cluster matter is proposed in this paper as the nature of dense matter in reality. In compact stars at...

Source: http://arxiv.org/abs/1107.0834v4

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Sep 22, 2013
09/13

by
V. Barger; Y. Gao; W. -Y. Keung; D. Marfatia

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We describe a characteristic signature of dark matter (DM) annihilation or decay into gamma-rays. We show that if the total angular momentum of the initial DM particle(s) vanishes, and helicity suppression operates to prevent annihilation/decay into light fermion pairs, then the amplitude for the dominant 3-body final state f^+f^-\gamma has a unique form dictated by gauge invariance. This amplitude and the corresponding energy spectra hold for annihilation of DM Majorana fermions or...

Source: http://arxiv.org/abs/0906.3009v2

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Sep 18, 2013
09/13

by
Y. C. Jian; Y. Gao; J. P. Huang; R. Tao

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By using theoretical analysis and molecular dynamics simulations, we investigate the structure of colloidal crystals formed by nonmagnetic microparticles (or magnetic holes) suspended in ferrofluids (called inverse ferrofluids), by taking into account the effect of polydispersity in size of the nonmagnetic microparticles. Such polydispersity often exists in real situations. We obtain an analytical expression for the interaction energy of monodisperse, bidisperse, and polydisperse inverse...

Source: http://arxiv.org/abs/cond-mat/0611395v2

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Sep 21, 2013
09/13

by
Y. Gao; J. Dobaczewski; M. Kortelainen; J. Toivanen; D. Tarpanov

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Parameters of nuclear energy-density-functionals (EDFs) are always derived by an optimization to experimental data. For the minima of appropriately defined penalty functions, a statistical sensitivity analysis provides the uncertainties of the EDF parameters. To quantify theoretical errors of observables given by the model, we studied the propagation of uncertainties within the UNEDF0 Skyrme-EDF approach. We found that typically the standard errors rapidly increase towards neutron rich nuclei....

Source: http://arxiv.org/abs/1301.6151v1

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Sep 23, 2013
09/13

by
Z. Yang; X. Sun; Y. Gao; S. Chen; J. Cheng

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The effects of intensity interferometry (HBT), which are mainly reflected by the measured momentum correlations, have been fully discussed since 1950's. The analogous momentum correlations between identical fermions are however less argued. Besides the fermion statistics, the momentum correlations between identical fermions are also determined by some other aspects, such as coulomb interaction, spin interactions and resonances formation. In this paper, we discussed the factors that influence...

Source: http://arxiv.org/abs/nucl-th/0511034v1

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Sep 23, 2013
09/13

by
V. Barger; Y. Gao; W. -Y. Keung; D. Marfatia; G. Shaughnessy

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We analyze new diffuse gamma-ray data from the Fermi Gamma-ray Space Telescope, which do not confirm an excess in the EGRET data at galactic mid-latitudes, in combination with measurements of electron and positron fuxes from PAMELA, Fermi and HESS within the context of three possible sources: dark matter (DM) annihilation or decay into charged leptons, and a continuum distribution of pulsars. We allow for variations in the backgrounds, consider several DM halo profiles, and account for...

Source: http://arxiv.org/abs/0904.2001v2

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Sep 18, 2013
09/13

by
Y. Gao; Y. C. Jian; L. F. Zhang; J. P. Huang

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Ferrofluids containing nonmagnetic particles are called inverse ferrofluids. On the basis of the Ewald-Kornfeld formulation and the Maxwell-Garnett theory, we theoretically investigate the magnetophoretic force exerting on the nonmagnetic particles in inverse ferrofluids due to the presence of a nonuniform magnetic field, by taking into account the structural transition and long-range interaction. We numerically demonstrate that the force can be adjusted by choosing appropriate lattices, volume...

Source: http://arxiv.org/abs/physics/0611151v2

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3.0

Jun 29, 2018
06/18

by
Z. J. Bai; C. F. Jiao; Y. Gao; F. R. Xu

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Configuration-constrained potential-energy-surface calculations have been performed to investigate the $K$ isomerism in the proton-rich $A\sim80$ mass region. An abundance of high-$K$ states are predicted. These high-$K$ states arise from two and four-quasi-particle excitations, with $K^{\pi}=8^{+}$ and $K^{\pi}=16^{+}$, respectively. Their excitation energies are comparatively low, making them good candidates for long-lived isomers. Since most nuclei under studies are prolate spheroids in...

Topic: Nuclear Theory

Source: http://arxiv.org/abs/1603.07470

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Jun 28, 2018
06/18

by
H. Xu; R. Stepanov; K. Kuzanyan; D. Sokoloff; H. Zhang; Y. Gao

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The electric current helicity density $\displaystyle \chi=\langle\epsilon_{ijk}b_i\frac{\partial b_k}{\partial x_j}\rangle$ contains six terms, where $b_i$ are components of the magnetic field. Due to the observational limitations, only four of the above six terms can be inferred from solar photospheric vector magnetograms. By comparing the results for simulation we distinguished the statistical difference of above six terms for isotropic and anisotropic cases. We estimated the relative degree...

Topics: Solar and Stellar Astrophysics, Astrophysics

Source: http://arxiv.org/abs/1509.02652

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Jul 20, 2013
07/13

by
T. R. Greve; P. P. Papadopoulos; Y. Gao; S. J. E. Radford

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Ultra Luminous Infra-Red Galaxies (ULIRGs) -- gas-rich mergers harboring the most extreme star-forming conditions encountered in the local Universe -- are thought to re-enact the galaxy formation processes we are only barely able to glimpse in the distant Universe. Combining new single-dish molecular line observations of 12CO, 13CO, HCO+, HCN, and CS towards the two ULIRGs Arp220 and NGC6240 with existing data in the literature, we have compiled the most extensive molecular line data-sets to...

Source: http://arxiv.org/abs/astro-ph/0609826v1

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Sep 19, 2013
09/13

by
T. R. Greve; P. P. Papadopoulos; Y. Gao; S. J. E. Radford

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We report single-dish multi-transition measurements of the 12^CO, HCN, and HCO^+ molecular line emission as well as HNC J=1-0 and HNCO in the two ultraluminous infra-red galaxies Arp220 and NGC6240. Using this new molecular line inventory, in conjunction with existing data in the literature, we compiled the most extensive molecular line data sets to date for such galaxies. The many rotational transitions, with their different excitation requirements, allow the study of the molecular gas over a...

Source: http://arxiv.org/abs/astro-ph/0610378v2

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Jun 27, 2018
06/18

by
X. Y. Gao; W. Reich; P. Reich; J. L. Han; R. Kothes

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Superbubbles and supershells are the channels for transferring mass and energy from the Galactic disk to the halo. Magnetic fields are believed to play a vital role in their evolution. We study the radio continuum and polarized emission properties of the W4 superbubble to determine its magnetic field strength. New sensitive radio continuum observations were made at 6 cm, 11 cm, and 21 cm. The total intensity measurements were used to derive the radio spectrum of the W4 superbubble. The linear...

Topics: Astrophysics of Galaxies, Astrophysics

Source: http://arxiv.org/abs/1504.00142

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Sep 19, 2013
09/13

by
Th. Seyller; K. V. Emtsev; F. Speck; K. -Y. Gao; L. Ley

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We have studied the electronic structure of the interface between 6H-SiC{0001} and graphite. On n-type and p-type 6H-SiC(0001) we observe Schottky barriers of Phi_b,n^Si= 0.3+-0.1eV and Phi_b,p^Si=2.7+-0.1eV, respectively. The observed barrier is face specific: on n-type 6H-SiC(000-1) we find Phi_b,n^C=1.3+-0.1eV. The impact of these barriers on the electrical properties of metal/SiC contacts is discussed.

Source: http://arxiv.org/abs/cond-mat/0610220v1

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Sep 22, 2013
09/13

by
J. Leech; K. G. Isaak; P. P. Papadopoulos; Y. Gao; G. R. Davis

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Luminous infrared galaxies ($L_{\rm{IR}}>10^{11} L_{\odot}$) are often associated with interacting galactic systems and are thought to be powered by merger--induced starbursts and/or dust--enshrouded AGN. In such systems, the evolution of the dense, star forming molecular gas as a function of merger separation is of particular interest. Here, we present observations of the CO(3-2) emission from a sample of luminous infrared galaxy mergers that span a range of galaxy-galaxy separations. The...

Source: http://arxiv.org/abs/1004.2650v2

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51

Sep 23, 2013
09/13

by
C. Kevin Xu; Yinghe Zhao; N. Scoville; P. Capak; N. Drory; Y. Gao

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We present results of a statistical study of the cosmic evolution of the mass dependent major-merger rate since z=1. A stellar mass limited sample of close major-merger pairs (the CPAIR sample) was selected from the archive of the COSMOS survey. Pair fractions at different redshifts derived using the CPAIR sample and a local K-band selected pair sample show no significant variations with stellar mass. The pair fraction exhibits moderately strong cosmic evolution, with the best-fitting...

Source: http://arxiv.org/abs/1109.3693v3

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53

Jul 20, 2013
07/13

by
V. V. Pipin; H. Zhang; D. D. Sokoloff; K. M. Kuzanyan; Y. Gao

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Observations of proxies of the magnetic helicity in the Sun over the past two solar cycles revealed reversals of the helicity hemispheric sign rule (negative in the North and positive in the South hemispheres). We apply the mean-field solar dynamo model to study the reversals of the magnetic helicity sign for the dynamo operating in the bulk of the solar convection zone. The evolution of the magnetic helicity is governed by the conservation law. We found that the reversal of the sign of the...

Source: http://arxiv.org/abs/1304.2440v1

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50

Sep 20, 2013
09/13

by
R. J. Magyar; S. Tretiak; Y. Gao; H. L. Wang; A. P. Shreve

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The excited state electronic structure of $\pi$ conjugated phenylene-acetylene oligomers is calculated using time-dependent density functional theory (TD-DFT) approaches. The theoretical fluorescence spectra are analyzed in terms of Frank-Condon active nuclear normal modes and shown to compare well with experiment. Theoretical and experimental results for the optical absorption and emission spectra of these molecules indicate that the conjugation length can be significantly reduced by...

Source: http://arxiv.org/abs/physics/0410014v1

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78

Sep 22, 2013
09/13

by
U. Patel; Y. Gao; D. Hover; G. J. Ribeill; S. Sendelbach; R. McDermott

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We have incorporated a single crystal silicon shunt capacitor into a Josephson phase qubit. The capacitor is derived from a commercial silicon-on-insulator wafer. Bosch reactive ion etching is used to create a suspended silicon membrane; subsequent metallization on both sides is used to form the capacitor. The superior dielectric loss of the crystalline silicon leads to a significant increase in qubit energy relaxation times. T1 times up to 1.6 micro-second were measured, more than a factor of...

Source: http://arxiv.org/abs/1210.1545v1

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66

Sep 22, 2013
09/13

by
William Y. C. Chen; Henry Y. Gao; Kathy Q. Ji; Martin Y. X. Li

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We obtain a unification of two refinements of Euler's partition theorem respectively due to Bessenrodt and Glaisher. A specialization of Bessenrodt's insertion algorithm for a generalization of the Andrews-Olsson partition identity is used in our combinatorial construction.

Source: http://arxiv.org/abs/0812.2826v3

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103

Jul 20, 2013
07/13

by
X. Y. Gao; X. H. Sun; J. L. Han; W. Reich; P. Reich; R. Wielebinski

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The Sino-German 6cm polarization survey has mapped in total intensity and polarization intensity over an area of approximately 2200 square degrees in the Galactic disk. This survey provides an opportunity to search for Galactic supernova remnants (SNRs) that were previously unknown. We discovered the new SNRs G178.2-4.2 and G25.1-2.3 which have non-thermal spectra, using the 6cm data together with the observations with the Effelsberg telescope at 11 cm and 21 cm. Both G178.2-4.2 and G25.1-2.3...

Source: http://arxiv.org/abs/1304.4732v1