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Sep 23, 2013
09/13

by
Z. H. Li

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The $^8$Li($n,\gamma$)$^9$Li reaction plays an important role in both the r-process nucleosynthesis and the inhomogeneous big bang models, its direct capture rates can be extracted from the $^8$Li($d, p$)$^9$Li reaction, indirectly. We have measured the angular distribution of the $^8$Li($d, p$)$^9$Li$_{\textrm{g.s.}}$ reaction at $E_{\textrm{c.m.}}$ = 7.8 MeV in inverse kinematics using coincidence detection of $^{9}\textrm{Li}$ and recoil proton, for the first time. Based on Distorted Wave...

Source: http://arxiv.org/abs/0903.3092v1

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59

Sep 22, 2013
09/13

by
L. H. Li

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Through relating a self-generated magnetic field to the regular motion of free electrons that is responsible for the magnetic field generation in astrophysical plasmas, we solve the Boltzmann kinetic equation in the presence of the self-generated magnetic fields to obtain a steady-state, collisional invariant analytic solution of the equation.

Source: http://arxiv.org/abs/astro-ph/9807116v1

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Sep 21, 2013
09/13

by
Y. H. Li

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The ballistic spin-filter effect from a ferromagnetic metal into a semiconductor has theoretically been studied with an intention of detecting the spin polarizability of density of states in FM layer at a higher energy level. The physical model for the ballistic spin filtering across the interface between ferromagnetic metals and semiconductor superlattice is developed by exciting the spin polarized electrons into n-type AlAs/GaAs superlattice layer at a much higher energy level and then...

Source: http://arxiv.org/abs/1204.5826v1

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May 6, 2013
05/13

by
P. H. Li

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Topics: Biochips., Microfluidics.

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54

Sep 18, 2013
09/13

by
H. Li; M. Kusunose

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Multiwavelength observations of blazars such as Mrk 421 and Mrk 501 show that they exhibit strong short time variabilities in flare-like phenomena. Based on the homogeneous synchrotron self-Compton (SSC) model and assuming that time variability of the emission is initiated by changes in the injection of nonthermal electrons, we perform detailed temporal and spectral studies of a purely cooling plasma system. One important parameter is the total injected energy E and we show how the synchrotron...

Source: http://arxiv.org/abs/astro-ph/0002134v1

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79

Sep 17, 2013
09/13

by
L. H. Li; S. Sofia

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We argue that a variety of solar data suggest that the activity-cycle timescale variability of the total irradiance, is produced by structural adjustments of the solar interior. Assuming these adjustments are induced by variations of internal magnetic fields, we use measurements of the total irradiance and effective temperature over the period from 1978 to 1992, to infer the magnitude and location of the magnetic field. Using an updated stellar evolution model, which includes magnetic fields,...

Source: http://arxiv.org/abs/astro-ph/0007203v2

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89

Sep 19, 2013
09/13

by
Sabatino Sofia; Linghuai H. Li

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Whereas a variation of the solar luminosity, L, will inevitably cause a similar change of the total solar irradiance, S, the opposite is not true. In fact, the bulk of the days to months variations of S can be explained entirely in terms of the passage of active regions across the solar disk. In this case, L remains essentially unchanged. For the total irradiance variation observed over the solar cycle, the issue is more uncertain. One view explains this modulation primarily as a combined...

Source: http://arxiv.org/abs/astro-ph/0010428v1

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Sep 23, 2013
09/13

by
Qiaoluan H. Li; Junping Wang

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A newly developed weak Galerkin method is proposed to solve parabolic equations. This method allows the usage of totally discontinuous functions in approximation space and preserves the energy conservation law. Both continuous and discontinuous time weak Galerkin finite element schemes are developed and analyzed. Optimal order error estimates in both H^1 and L^2 norms are established. Numerical tests are performed and reported.

Source: http://arxiv.org/abs/1212.3637v2

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Sep 19, 2013
09/13

by
Sabatino Sofia; Linghuai H. Li

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Recent precise observations of solar global parameters are used to calibrate an upgraded solar model which takes into account magnetic fields in the solar interior. Historical data about sunspot numbers (from 1500 to the present) and solar radius changes (between 1715 and 1979) are used to compute solar variability on years to centuries timescales. The results show that although the 11 year variability of the total irradiance is of the order of 0.1%, additional, longer lived changes of the...

Source: http://arxiv.org/abs/astro-ph/0010514v1

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54

Sep 21, 2013
09/13

by
C. -H. Li; D. Budker

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The photoionization cross-sections of two even-parity excited states, $5d6d ^3D_1$ and $6s7d ^3D_{2}$, of atomic Ba at the ionization-laser wavelength of 556.6 nm were measured. We found that the total cross-section depends on the relative polarization of the atoms and the ionization-laser light. With density-matrix algebra, we show that, in general, there are at most three parameters in the photoionization cross-section. Some of these parameters are determined in this work. We also present the...

Source: http://arxiv.org/abs/physics/0602189v2

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5.0

Aug 20, 2021
08/21

by
H Li; T-H Yi

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55

Sep 18, 2013
09/13

by
L. H. Li; S. Sofia

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A magnetic flux tube may be considered both as a separate body and as a confined field. As a field, it is affected both by the cyclonic convection ($\alpha$-effect) and differential rotation ($\Omega$-effect). As a body, the tube experiences not only a buoyant force, but also a dynamic pressure due to downflows above the tube. When these two dynamic effects are incorporated into the $\alpha\Omega$ dynamo equations, we obtain a dynamo operating in the convection zone. We analyze and solve the...

Source: http://arxiv.org/abs/astro-ph/0105393v2

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Sep 23, 2013
09/13

by
Dipanjan Mitra; X. H. Li

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We use a set of carefully selected published average multifrequency polarimetric observations for six bright cone dominated pulsars and devise a method to combine the multifrequency polarization position angle (PPA) sweep traverses. We demonstrate that the PPA traverse is in excellent agreement with the rotating vector model over this broad frequency range confirming that radio emission emanates from perfectly dipolar field lines. For pulsars with central core emission in our sample, we find...

Source: http://arxiv.org/abs/astro-ph/0312560v1

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62

Sep 18, 2013
09/13

by
X. H. Li; J. L. Han

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We identified 16 pulsars from the Faint Images of the Radio Sky at Twenty-cm (FIRST) at 1.4 GHz. Their positions and total flux densities are extracted from the FIRST catalog. Comparing the source positions with those in the PSRcatalog, we obtained better determined positions of PSRs J1022+1001, J1518+4904, J1652+2651, and proper motion upper limits of another three pulsars PSRs J0751+1807, J1012+5307, J1640+2224. Proper motions of the other 10 pulsars are consistent with the values in the...

Source: http://arxiv.org/abs/astro-ph/0110325v1

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61

Sep 22, 2013
09/13

by
X. H. Li; J. L. Han

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The low-frequency profiles of some pulsars manifest temporal broadening due to scattering, usually accompanied by flat polarization position angle (PA) curves. Assuming that the scattering works on the 4 Stokes parameters in the same way, we have simulated the effect of scattering on polarization profiles and find that the scattering can indeed flatten the PA curves. Since the higher-frequency profiles suffer less from scattering, they are convolved with scattering models to fit the observed...

Source: http://arxiv.org/abs/astro-ph/0308095v1

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59

Sep 19, 2013
09/13

by
C. Dong; H. Li; G. Mason

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The notions of vertex Lie algebra and vertex Poisson algebra are presented and connections among vertex Lie algebras, vertex Poisson algebras and vertex algebras are discussed.

Source: http://arxiv.org/abs/math/0102127v1

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52

Sep 22, 2013
09/13

by
T. Abe; C. Dong; H. Li

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The fusion rules for the vertex operator algebras M(1)^+ (of any rank) and V_L^+ (for any positive definite even lattice L) are determined completely.

Source: http://arxiv.org/abs/math/0310425v1

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52

Jul 20, 2013
07/13

by
Y. F. Gu; X. H. Li

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The so-called \rho\pi puzzle of J\psi and \psi(2S) decays is examined using the experimental data available to date. Two different approaches were taken to estimate the ratio of J\psi and \psi(2S) hadronic decay rates. While one of the estimates could not yield the exact ratio of \psi(2S) to J\psi inclusive hadronic decay rates, the other, based on a computation of the inclusive ggg decay rate for \psi(2S) (J\psi) by subtracting other decay rates from the total decay rate, differs by two...

Source: http://arxiv.org/abs/hep-ph/9910406v3

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61

Jul 20, 2013
07/13

by
C. Dong; H. Li; G. Mason

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Let V be a vertex operator algebra and g an automorphism of order T. We construct a sequence of associative algebras A_{g,n}(V) with n\in\frac{1}{T}\Z nonnegative such that A_{g,n}(V) is a quotient of A_{g,n+1/T}(V) and a pair of functors between the category of A_{g,n}(V)-modules which are not A_{g,n-1/T}(V)-modules and the category of admissible V-modules. These functors exhibit a bijection between the simple modules in each category. We also show that V is g-rational if and only if all...

Source: http://arxiv.org/abs/q-alg/9702027v1

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98

Sep 17, 2013
09/13

by
C. H. Li; C. M. Ko

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Using a gauged flavor SU(3) invariant hadronic Lagrangian, we study $\Xi$ production from $\bar K$ induced reactions on $\Lambda$ and $\Sigma$ in a coupled-channel approach. Including the four channels of $\bar K\Lambda$, $\bar K\Sigma$, $\pi\Xi$, and $\eta\Xi$, we solve the Bethe-Salpeter equation in the $K$-matrix approximation by neglecting the off-shell contribution in the intermediate states. For the transition potential which drives the higher-order contribution, we consider all allowed...

Source: http://arxiv.org/abs/nucl-th/0207031v1

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13

Feb 28, 2020
02/20

by
J H Li; M J Donoghue

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55

Sep 21, 2013
09/13

by
L. H. Li; H. Q. Zhang

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A dynamical model based on the two-fluid dynamical equations with energy generation and loss is obtained and used to investigate the self-generated magnetic fields in high-temperature dense plasmas such as the solar core. The self-generation of magnetic fields might be looked at as a self-organization-type behavior of stochastic thermal radiation fields, as expected for an open dissipative system according to Prigogine's theory of dissipative structures.

Source: http://arxiv.org/abs/astro-ph/9711002v1

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60

Sep 19, 2013
09/13

by
Y. F. Gu; X. H. Li

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Recent data on branching ratios for \psi(2S) decays to J/\psi\pi^+\pi^-, J/\psi\pi^0\pi^0 and J/\psi\eta are reviewed. An alternative treatment of data is proposed to get rid of the logical inconsistency which occurs in original computational procedure.

Source: http://arxiv.org/abs/hep-ex/9812027v2

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76

Sep 18, 2013
09/13

by
M. Kusunose; F. Takahara; H. Li

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Blazars are known to emit a broad band emission from radio to gamma-rays with rapid time variations, particularly, in X- and gamma-rays. Synchrotron radiation and inverse Compton scattering are thought to play an important role in emission and the time variations are likely related to the acceleration of nonthermal electrons. As simultaneous multiwavelength observations with continuous time spans are recently available, some characteristics of electron acceleration are possibly inferred from...

Source: http://arxiv.org/abs/astro-ph/0002137v1

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46

Jul 24, 2013
07/13

by
S. Mazumdar; R. T. Clay; H. Li

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We show that superconductivity is absent within the 1/2-filled band triangular lattice repulsive Hubbard model that has been proposed for organic charge-transfer solids. We posit that organic superconductivity is rather reached from a Bond-Charge Density Wave that either constitutes the insulating state proximate to superconductivity, or is extremely close in energy to the antiferromagnetic state, and replaces the latter under pressure. The Bond-Charge Density Wave can be described within an...

Source: http://arxiv.org/abs/0807.4523v1

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51

Sep 22, 2013
09/13

by
H. Li; R. T. Clay; S. Mazumdar

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The competition between antiferromagnetic and spin-singlet ground states within quantum spin models and the 1/2-filled band Hubbard model has received intense scrutiny. Here we demonstrate a frustration-induced transition from N\'{e}el antiferromagnetism to spin-singlet in the interacting 1/4-filled band on an anisotropic triangular lattice. While the antiferromagnetic state has equal charge densities 0.5 on all sites, the spin-singlet state is a paired-electron crystal, with pairs of...

Source: http://arxiv.org/abs/0908.4109v2

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42

Sep 23, 2013
09/13

by
H. Li; R. T. Clay; S. Mazumdar

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A natural explanation for the carrier concentration-dependent electronic behavior in the layered cobaltates emerges within correlated-electron Hamiltonians with finite on-site and significant nearest neighbor hole-hole Coulomb repulsions. The nearest neighbor repulsion decreases hole double-occupancy below hole density 1/3, but increases the same at higher hole densities. Our conclusion is valid for both single-band and three-band extended Hubbard Hamiltonians, and sheds light on...

Source: http://arxiv.org/abs/1012.3118v2

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18

Feb 19, 2020
02/20

by
H Li; C L Long; Josef Bogner

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11

Aug 20, 2021
08/21

by
F Bian; H Li; Z-L Wang

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60

Sep 19, 2013
09/13

by
J. -C. Aval; N. Bergeron; H. Li

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We introduce the notion of a combinatorial inverse system in non-commutative variables. We present two important examples, some conjectures and results. These conjectures and results were suggested and supported by computer investigations.

Source: http://arxiv.org/abs/0909.1112v1

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47

Sep 22, 2013
09/13

by
S. Li; M. J. Buoni; H. Li

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Disk self-gravity could play an important role in the dynamic evolution of interaction between disks and embedded protoplanets. We have developed a fast and accurate solver to calculate the disk potential and disk self-gravity forces for disk systems on a uniform polar grid. Our method follows closely the method given by Chan et al. (2006), in which an FFT in the azimuthal direction is performed and a direct integral approach in the frequency domain in the radial direction is implemented on a...

Source: http://arxiv.org/abs/0812.0590v1

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62

Sep 18, 2013
09/13

by
C. D. Dermer; H. Li; J. Chiang

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Blazar flare data show energy-dependent lags and correlated variability between optical/X-ray and GeV-TeV energies, and follow characteristic trajectories when plotted in the spectral-index/flux plane. This behavior is qualitatively explained if nonthermal electrons are injected over a finite time interval in the comoving plasma frame and cool by radiative processes. Numerical results are presented which show the importance of the effects of synchrotron self-Compton cooling and plasmoid...

Source: http://arxiv.org/abs/astro-ph/9901386v1

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45

Sep 22, 2013
09/13

by
R. T. Clay; H. Li; S. Mazumdar

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We report exact calculations of magnetic and superconducting pair-pair correlations for the half-filled band Hubbard model on an anisotropic triangular lattice. Our results for the magnetic phases are similar to those obtained with other techniques. The superconducting pair-pair correlations at distances beyond nearest neighbor decrease monotonically with increasing Hubbard interaction U for all anisotropy, indicating the absence of frustration-driven superconductivity within the model.

Source: http://arxiv.org/abs/0805.0590v1

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4.0

Jun 30, 2018
06/18

by
M. Kandić; H. Li; V. G. Troitsky

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In this paper, we generalize the concept of unbounded norm (un) convergence: let $X$ be a normed lattice and $Y$ a vector lattice such that $X$ is an order dense ideal in $Y$; we say that a net $(y_\alpha)$ un-converges to $y$ in $Y$ with respect to $X$ if $\Bigl\lVert\lvert y_\alpha-y\rvert \wedge x\Bigr\rVert\to 0$ for every $x\in X_+$. We extend several known results about un-convergence and un-topology to this new setting. We consider the special case when $Y$ is the universal completion of...

Topics: Functional Analysis, Mathematics

Source: http://arxiv.org/abs/1703.10654

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57

Sep 18, 2013
09/13

by
R. T. Clay; S. Mazumdar; H. Li

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We suggest that superconductivity (SC) in the organic charge transfer solids (CTS) is reached from a Bond-Charge Density Wave (BCDW). We discuss an effective model for the BCDW to SC transition, an attractive U extended Hubbard Hamiltonian with repulsive nearest neighbor interaction V. We discuss experimental consequences of the theory for different classes of CTS superconductors as well as related inorganic materials.

Source: http://arxiv.org/abs/0809.1583v1

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Sep 19, 2013
09/13

by
R. T. Clay; H. Li; S. Mazumdar

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We describe the Paired Electron Crystal (PEC) which occurs in the interacting frustrated two-dimensional 1/4-filled band. The PEC is a charge-ordered state with nearest-neighbor spin singlets separated by pairs of vacant sites, and can be thought of as a bipolaron density wave. The PEC has been experimentally observed in the insulating state proximate to superconductivity in the organic charge-transfer solids. Increased frustration drives a PEC-to-superconductor transition in these systems.

Source: http://arxiv.org/abs/0910.2728v1

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51

Sep 18, 2013
09/13

by
G. Novak; J. L. Dotson; H. Li

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One can estimate the characteristic magnetic field strength in GMCs by comparing submillimeter polarimetric observations of these sources with simulated polarization maps developed using a range of different values for the assumed field strength. The point of comparison is the degree of order in the distribution of polarization position angles. In a recent paper by H. Li and collaborators, such a comparison was carried out using SPARO observations of two GMCs, and employing simulations by E....

Source: http://arxiv.org/abs/0707.2818v2

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98

Sep 18, 2013
09/13

by
S. A. Colgate; H. Li; V. Pariev

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(abridged) The interpretation of Faraday rotation measure maps of AGNs within galaxy clusters has revealed regions, $\sim 50-100$ kpc, that are populated with large, $\sim 30 \mu$ G magnetic fields. The magnetic energy of these coherent regions is $\sim 10^{59-60}$ ergs, and the total magnetic energy over the whole cluster ($\sim 1$ Mpc across) is expected to be even larger. A sequence of physical processes that are responsible for the production, redistribution and dissipation of these...

Source: http://arxiv.org/abs/astro-ph/0012484v1

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51

Sep 18, 2013
09/13

by
L. H. Li; S. Sofia; G. Belvedere

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A magnetic flux tube may be considered both as a separate body and as a confined field. As a field, it is affected both by differential rotation ($\Omega$-effect) and cyclonic convection ($\alpha$-effect). As a body, the tube experiences not only a buoyant force, but also a dynamic pressure due to downflows above the tube. These two competing dynamic effects are incorporated into the $\alpha$-$\Omega$ dynamo equations through the total magnetic turbulent diffusivity, leading to a flux tube...

Source: http://arxiv.org/abs/astro-ph/0509828v1

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70

Sep 23, 2013
09/13

by
Z. H. Li; B. Guo; S. Q. Yan

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$^{13}$N($p,\gamma$)$^{14}$O is one of the key reactions in the hot CNO cycle which occurs at stellar temperatures around $T_9$ $\geq$ 0.1. Up to now, some uncertainties still exist for the direct capture component in this reaction, thus an independent measurement is of importance. In present work, the angular distribution of the $^{13}$N($d,n$)$^{14}$O reaction at $E_{\rm{c.m.}}$ = 8.9 MeV has been measured in inverse kinematics, for the first time. Based on the distorted wave Born...

Source: http://arxiv.org/abs/0903.3094v1

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Sep 23, 2013
09/13

by
Z. H. Li; E. T. Li; B. Guo

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The angular distribution of the 2H(6He,7Li)n reaction was measured with a secondary 6He beam of 36.4 MeV for the first time. The proton spectroscopic factor of 7Li ground state was extracted to be 0.41 +- 0.05 by the normalization of the calculational differential cross sections with the distorted-wave Born approximation to the experimental data. It was found that the uncertainty of extracted spectroscopic factors from the one-nucleon transfer reactions induced by deuteron may be reduced by...

Source: http://arxiv.org/abs/0903.3442v1

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59

Sep 23, 2013
09/13

by
C. Dong; H. Li; G. Mason; P. Montague

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The radical $J(V)$ of a vertex operator algebra $V$ is defined to be the subspace of $V$ consisting of vectors $v$ such that the zero mode $o(v)=0$ on $V$ where $o(v)=v_{wt v-1}$ if $v$ is homogeneous. We establish various facts about $o(v),$ including the determination of $J(V)$ which is shown to be essentially equal to $(L(0)+L(-1))V.$

Source: http://arxiv.org/abs/q-alg/9608022v1

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20

Feb 28, 2020
02/20

by
J H Li; A L Bogle; A S Klein

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54
54

Sep 23, 2013
09/13

by
C. Dong; H. Li; G. Mason; S. P. Norton

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It is shown how certain idempotents in the Griess algebra generate the discrete series representations for the Virasoro algebra inside the Frenkel-Lepowsky-Meurman's moonshine module vertex operator algebra. It is also shown that each Niemeier lattice determines (in many ways) certain maximal associative subalgebras of the Griess algebra.

Source: http://arxiv.org/abs/q-alg/9607013v1

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57

Sep 19, 2013
09/13

by
Z. G. Huang; X. H. Li; Q. Q. Sun

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In this paper, we investigate the dynamics of Born-Infeld(B-I) phantom model in the $\omega-\omega'$ plane, which is defined by the equation of state parameter for the dark energy and its derivative with respect to $N$(the logarithm of the scale factor $a$). We find the scalar field equation of motion in $\omega-\omega'$ plane, and show mathematically the property of attractor solutions which correspond to $\omega_\phi\sim-1$, $\Omega_\phi=1$, which avoid the "Big rip" problem and...

Source: http://arxiv.org/abs/hep-th/0610019v2

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50

Sep 18, 2013
09/13

by
X. H. Li; F. J. Lu; T. P. Li

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We present spatially resolved X-ray spectroscopy of PSR B1951+32 and its pulsar wind nebula (PWN) in supernova remnant (SNR) CTB 80 using a {\sl Chandra} observation. The {\sl Chandra} X-ray map reveals clearly various components of a ram-pressure confined PWN embedded in the SNR ejecta: a point source representing the pulsar, X-ray emission from the bow shock, a luminous X-ray tail, a 30$\arcsec$ diameter plateau whose northwestern part is absent, and the outside more diffuse X-ray emission....

Source: http://arxiv.org/abs/astro-ph/0504293v1

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93

Sep 24, 2013
09/13

by
W. Zuo; A. Li; Z. H. Li; U. Lombardo

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We explore the effects of a microscopic nuclear three-body force on the threshold baryon density for kaon condensation in chemical equilibrium neutron star matter and on the composition of the kaon condensed phase in the framework of the Brueckner-Hartree-Fock approach. Our results show that the nuclear three-body force affects strongly the high-density behavior of nuclear symmetry energy and consequently reduces considerably the critical density for kaon condensation provided that the proton...

Source: http://arxiv.org/abs/nucl-th/0412102v1

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55

Sep 18, 2013
09/13

by
S. Dayal; R. T. Clay; H. Li; S. Mazumdar

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We present a study of the effects of simultaneous charge- and spin-frustration on the two-dimensional strongly correlated quarter-filled band on an anisotropic triangular lattice. The broken-symmetry states that dominate in the weakly frustrated region near the rectangular lattice limit are the well known antiferromagnetic state with in-phase lattice dimerization along one direction, and the Wigner crystal state with the checkerboard charge order. For moderate to strong frustration, however,...

Source: http://arxiv.org/abs/1102.1731v1

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20

Feb 28, 2020
02/20

by
J H Li; D L Zhang; M J Donoghue

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15

Feb 28, 2020
02/20

by
J H Li; A L Bogle; A S Klein

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