The nucleus as a fluid of skyrmions: Energy levels and nucleon properties in the medium

A model of a fluid of skyrmions coupled to a scalar and to the \o meson mean fields is developed. The central and spin-orbit potentials of a skyrmion generated by the fields predict correct energy levels in selected closed shell nuclei. The effect of the meson fields on the properties of skyrmions in nuclei is investigated.Comment: Latex format, 6 figures, Journal of Physics G, to be publishe

Androgen Receptor and Vasopressin Receptor (AVPR1a) Genetic Polymorphisms are not associated with Marital Status or Fertility among Ariaal Men of Northern Kenya

A growing body of scholarship implicates testosterone and vasopressin in male reproductive behavior, including in humans. Since hormones exert their effects through their respective receptors, an open question has been whether genetic polymorphisms in the androgen receptor and vasopressin 1a receptor (AVPR1a) impact human male social behavior. Here, we sought to test for associations between polymorphisms in the coding region of the androgen receptor and promoter region of AVPR1a in relation to marital status and fertility among pastoralist Ariaal men of northern Kenya. None of the three polymorphisms were related to marital status (single, monogamously married, polygynously married) or fertility (number of current living children). We discuss these null findings in light of existing data

Ground state of two-component degenerate fermionic gases

We analyze the ground state of the two--component gas of trapped ultracold fermionic atoms. We neglect the forces between atoms in the same hyperfine state (the same component). For the case when the forces between distinguishable atoms (i.e., atoms in different hyperfine states) are repulsive (positive mutual scattering length), we find the existence of critical interaction strength above which one atomic fraction expels the other from the center of the trap. When atoms from different components attract each other (negative mutual scattering length) the ground state of the system dramatically changes its structure for strong enough attraction -- the Cooper pairs built of atoms in different hyperfine states appear.Comment: 10 pages, 14 figure

Projection of two biphoton qutrits onto a maximally entangled state

Bell state measurements, in which two quantum bits are projected onto a maximally entangled state, are an essential component of quantum information science. We propose and experimentally demonstrate the projection of two quantum systems with three states (qutrits) onto a generalized maximally entangled state. Each qutrit is represented by the polarization of a pair of indistinguishable photons - a biphoton. The projection is a joint measurement on both biphotons using standard linear optics elements. This demonstration enables the realization of quantum information protocols with qutrits, such as teleportation and entanglement swapping.Comment: 4 pages, 3 figures, published versio

Addressing the Zeros Problem: Regression Models for Outcomes with a Large Proportion of Zeros, with an Application to Trial Outcomes

In law‐related and other social science contexts, researchers need to account for data with an excess number of zeros. In addition, dollar damages in legal cases also often are skewed. This article reviews various strategies for dealing with this data type. Tobit models are often applied to deal with the excess number of zeros, but these are more appropriate in cases of true censoring (e.g., when all negative values are recorded as zeros) and less appropriate when zeros are in fact often observed as the amount awarded. Heckman selection models are another methodology that is applied in this setting, yet they were developed for potential outcomes rather than actual ones. Two‐part models account for actual outcomes and avoid the collinearity problems that often attend selection models. A two‐part hierarchical model is developed here that accounts for both the skewed, zero‐inflated nature of damages data and the fact that punitive damage awards may be correlated within case type, jurisdiction, or time. Inference is conducted using a Markov chain Monte Carlo sampling scheme. Tobit models, selection models, and two‐part models are fit to two punitive damage awards data sets and the results are compared. We illustrate that the nonsignificance of coefficients in a selection model can be a consequence of collinearity, whereas that does not occur with two‐part models

Regular expressions as violin bowing patterns

String players spend a significant amount of practice time creating and learning bowings. These may be indicated in the music using up-bow and down-bow symbols, but those traditional notations do not capture the complex bowing patterns that are latent within the music. Regular expressions, a mathematical notation for a simple class of formal languages, can describe precisely the bowing patterns that commonly arise in string music. A software tool based on regular expressions enables performers to search for passages that can be handled with similar bowings, and to edit them consistently. A computer-based music editor incorporating bowing patterns has been implemented, using Lilypond to typeset the music. Our approach has been evaluated by using the editor to study ten movements from six violin sonatas by W. A. Mozart. Our experience shows that the editor is successful at finding passages and inserting bowings; that relatively complex patterns occur a number of times; and that the bowings can be inserted automatically and consistently

Trial Outcomes and Demographics: Is There a Bronx Effect?

Minorities favor injured plaintiffs and give them inflated awards. This folk wisdom in the legal community influences choice of trial locale and the screening of jurors. A Los Angeles court is said to be known by local lawyers as the bank because of the frequency and size of its anti-corporate awards. A newspaper article summarizing court results suggests, somewhat jokingly, that the Bronx County Courthouse should post a warning: People who get sued here run an increased risk of suffering staggering losses. Beliefs about the influence of factors other than race, such as income and urbanization, also are common. This Article tests these beliefs by studying the mass of tried cases. It analyzes damages awards and plaintiff win rates at trials in both federal and state courts for tort cases, products liability cases, and employment cases. Although award levels and win rates differ significantly across geographic areas, these differences often do not uniformly reflect the folk wisdom about demographic influences. In federal court trials, we find no robust evidence that award levels in cases won by plaintiffs correlate with population demographics in the expected direction. Indeed, one persistent result is a negative relation between award levels and black population percentages. With respect to plaintiff win rates in federal trials, we again find no robust evidence that local demographics help explain trial outcomes in the mass of cases. We do, however, find a significant correlation between larger black population percentages and the likelihood of a plaintiff trial win in urban job discrimination, products liability, and tort cases. In state court trials, we again find no robust evidence (at traditional levels of statistical significance) that race, income, or urbanization substantially help explain award levels. Poverty rates do have marginally significant correlations with increased award levels in tort and employment cases. And plaintiff win rates do correlate positively with poverty rates in state court tort cases, but this effect does not emerge in products liability or employment cases. Overall, we find little evidence of consistent demographic effects on trial outcomes

Significant Association Between Punitive and Compensatory Damages in Blockbuster Cases: A Methodological Primer

This article assesses the relation between punitive and compensatory damages in a data set, gathered by Hersch and Viscusi (H-V), consisting of all known punitive damages awards in excess of $100 million from 1985 through 2003. It shows that a strong, statistically significant relation exists between punitive and compensatory awards, a relation that replicates similar findings in nearly all other analyses of punitive and compensatory damages. H-V\u27s claim that no significant relation exists between punitive and compensatory awards in these data appears to be an artifact of questionable regression methodology