11,795 research outputs found
Electric Polarizability of Hadrons
The electric polarizability of a hadron allows an external electric field to
shift the hadron mass. We try to calculate the electric polarizability for
several hadrons from their quadratic response to the field at a=0.17fm using an
improved gauge field and the clover quark action. Results are compared to
experiment where available.Comment: 3 pgs, 5 figs, LATTICE2002(spectrum
On the effectiveness of housing purchase restriction policy in China: A difference in difference approach
The incentivisation of English medium instruction in Chinese universities: Policy misfires and misalignments
The growth of English medium instruction (EMI) in higher education in China over the past two decades has been promoted via implicit and explicit policies that aim to incentivise activities associated with the creation of English-taught courses and programs. This study investigates the components of such incentivisation schemes. It also explores how incentivisation policies are being implemented by policy arbiters, EMI programme directors, and EMI teachers. Data were collected from two sources: 93 institutional policy documents on EMI provision collected from 63 Chinese universities, and 26 interviews with senior university staff at a selection of eight Chinese universities. Results revealed that incentivisation policies focused on increased workload weighting for EMI courses, greater access to career development opportunities for teachers, increased monetary rewards, and dedicated financial support for creating and delivering courses. A comparison of policy and practice revealed areas of policy misfires and misalignments. EMI teachers considered the workload incentives insufficient and were not primarily motivated by financial rewards, but rather chose to teach in English for professional, academic, and personal intrinsic rewards; many viewed EMI at the core of their teacher-researcher academic identities. The paper concludes with recommendations to better align incentivisation policies with the driving forces attached to EMI in China
THE ANATOMY OF THE WORLD. Michael Macdem. â HANDBOOK OF MODERN EQUITY. William Q. de Funiak. â TRAFFIC VICTIMS â Tort Law and Insurance. Leon Green.
THE ANATOMY OF THE WORLD. Michael Macdem. â HANDBOOK OF MODERN EQUITY. William Q. de Funiak. â TRAFFIC VICTIMS â Tort Law and Insurance. Leon Green.
Bounded Representations of Interval and Proper Interval Graphs
Klavik et al. [arXiv:1207.6960] recently introduced a generalization of
recognition called the bounded representation problem which we study for the
classes of interval and proper interval graphs. The input gives a graph G and
in addition for each vertex v two intervals L_v and R_v called bounds. We ask
whether there exists a bounded representation in which each interval I_v has
its left endpoint in L_v and its right endpoint in R_v. We show that the
problem can be solved in linear time for interval graphs and in quadratic time
for proper interval graphs.
Robert's Theorem states that the classes of proper interval graphs and unit
interval graphs are equal. Surprisingly the bounded representation problem is
polynomially solvable for proper interval graphs and NP-complete for unit
interval graphs [Klav\'{\i}k et al., arxiv:1207.6960]. So unless P = NP, the
proper and unit interval representations behave very differently.
The bounded representation problem belongs to a wider class of restricted
representation problems. These problems are generalizations of the
well-understood recognition problem, and they ask whether there exists a
representation of G satisfying some additional constraints. The bounded
representation problems generalize many of these problems
Self-sustained oscillations in homogeneous shear flow
Generation of the large-scale coherent vortical structurs in homogeneous
shear flow couples dynamical processes of energy and enstrophy production. In
the large rate of strain limit, the simple estimates of the contributions to
the energy and enstrophy equations result in a dynamical system, describing
experimentally and numerically observed self-sustained non-linear oscillations
of energy and enstrophy. It is shown that the period of these oscilaltions is
independent upon the box size and the energy and enstrophy fluctuations are
strongly correlated.Comment: 10 pages 6 figure
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Multiple shape memory behavior of highly oriented longâchainâbranched poly(lactic acid) and its recovery mechanism
YesThe shape memory effect of highly oriented longâchainâbranched poly(lactic acid) (LCBâPLA) prepared through solidâphase die drawing technology was studied by comparison with PLA. When the recovery temperature increased from 60°C to 120°C, for PLA, only oneâstep recovery at about 80°C can be observed and the recovery ratio was below 21.5%, while, for LCBâPLA, multiple recovery behavior with high recovery ratio of 78.8% can be achieved. For oriented PLA, the recovery curve of the final sample showed the same trend with that of sample suffering just free drawing; while for oriented LCBâPLA, the recovery curve of the final sample showed the same trend with that of sample suffering just die drawing. After shape recovery, the mechanical properties of LCBâPLA showed a linear downward trend with the recovery temperature. Together with amorphous phase, the oriented mesomorphic phase, which formed during solid die drawing, can act as switching domains. And thus, upon heating, the chain segment of amorphous phase relaxed at first and triggered the first macroscopical shape recovery, leading to the decrease of long period (Lac) and the thickness of the amorphous layer (La). Then, with further increasing temperature, the oriented mesomorphic phase gradually relaxed resulting subsequently multiâshape recovery, and the Lac and the La further decreased. Therefore, by regulating the recovery temperature of oriented LCBâPLA, the shape recovery ratio and mechanical strength can be controlled effectively, and thus the selfâreinforced and selfâfastening effect can be achieved simultaneously for PLA as bone fixation material
``Fermi Liquid'' Shell Model Approach to Composite Fermion Excitation Spectra in Fractional Quantum Hall States
Numerical results for the energy spectra of electrons on a spherical
surface are used as input data to determine the quasiparticle energies and the
pairwise ``Fermi liquid'' interactions of composite Fermion (CF) excitations in
fractional quantum Hall systems. The quasiparticle energies and their
interactions are then used to determine the energy spectra, vs total
angular momentum , of states containing more than two quasiparticles. The
qualitative agreement with the numerical results gives a remarkable new
confirmation of the CF picture.Comment: LaTex, 4 pages, including 4 .eps-figures, to be appear in pr
Purification, Characterization and Antimicrobial Properties of Hemolymph Lectin from the Larva of Red Palm Weevil, Rhynchophorus ferrugineus
Lectins are renowned hemagglutinins and multivalent proteins with a well-known quality for sugar-binding specificity that participate significantly in invertebrate defense functions. Studies on biological activity of lectin from coleopteran insect are very scarce. A lectin with specific affinity for N-acetyl neuraminic acid was purified from the hemolymph of the larva of the red palm weevil, Rhynchophorus ferrugineus by biospecific adsorption using formalinized rabbit erythrocytes and affinity chromatography using PSM-linked cyanogen bromide activated Sepharose 4B. The specific activity of the lectin purified by affinity chromatography was much higher than the lectin purified by biospecific adsorption. The binding specificity of the weevil lectin distinguishes it from other known insect lectins. Like the crude agglutinin, the lectin purified by affinity chromatography also showed the same pattern of specificity towards erythrocytes. However, 4-to-8-fold decrease in HA titer was observed when tested with the purified lectin. In the same way, reduction is also observed in the HAI titer of the purified lectin with most of the inhibitors except PSM where the HAI titer was identical both in the crude agglutinin and purified lectin. Sugars N-acetyl neuraminic acid, N-acetyl mannosamine and N-acetyl-D-galactosamine inhibited the HA titer of the purified lectin with greater efficacy than the crude agglutinin. The sialic acid specificity of the lectin was confirmed by 16-fold reduction in HA titer with asialo rabbit erythrocytes and 32-fold reduction in HAI titer with desialylated PSM. The purified lectin is homogenous on sodium dodecyl sulphate-polyacrylamide electrophorogram with a molecular weight of about 60 kDa. The lectin showed antimicrobial activity against pathogenic bacteria Streptococcus mutans, Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeroginosa and fungi Candida albicans and Aspergillus niger
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