University of Haifa

About: University of Haifa is a education organization based out in Haifa, Israel. It is known for research contribution in the topics: Population & Poison control. The organization has 7558 authors who have published 27141 publications receiving 711629 citations. The organization is also known as: Haifa University & Universiṭat Ḥefah.

Immigrants' pathways to business ownership : A comparative ethnic perspective

Abstract: This paper provides a comparative perspective of pathways to entrepre? neurship among Hispanic (mostly Mexican), Korean, non-Hispanic white, and Middle-Eastern/South-Asian entrepreneurs to identify com? mon and unique circumstances conducive to business ownership. A stratified random sample business survey conducted in an immigrant neighborhood in Chicago is analyzed, to determine whether employment in a co-ethnic firm and informal self-employment serve as a stepladder to business ownership. The blocked mobility hypothesis is examined by considering self-reports about reasons for becoming self-employed. Results show that the informal economy is a common pathway to steady self-employment for Hispanics, whereas entry through employment in a co-ethnic firm was more common among Koreans than immigrants from

Outcrossing rates and heterozygosity in natural populations of Hordeum spontaneum Koch in Israel

Abstract: The extent of cross-pollination was estimated quantitatively in 26 populations of wild barley (H. spontaneum) in Israel, using allozyme variation at 22 polymorphic loci. Individual population estimates varied from 0 to 9·6 per cent outcrossing. The overall average was 1·6 per cent, with a 95 per cent confidence range of 0·8-2·7 per cent. The evidence indicated that outcrossing was significantly higher in populations growing in the more mesic (2·1 percent), than in the xeric regions (0·4 per cent). The average frequency of multilocus homozygosity for the 22 loci was 0·963 which was in agreement with the level expected under the observed high rate of self-fertilisation, indicating no heterozygous excess. However, the heterozygotes encountered, displayed a very high degree of multiple heterozygosity which arises from extensive gametic phase (or linkage) disequilibrium. In general, these results do not support the contention that the bulk of the genetic polymorphism found in H. spontaneum in Israel has arisen in recent times by periodic introgression from cultivated barley (H. vulgare L.). Rather they indicate that extensive genetic polymorphisms probably predates the domestication of the crop, and is maintained independently of introgression.

Holographic nuclear physics

Abstract: We analyze the phases of the Sakai-Sugimoto model at finite temperature and baryon chemical potential. Baryonic matter is represented either by 4-branes in the 8-branes or by strings stretched from the 8-branes to the horizon. We find the explicit configurations and use them to determine the phase diagram and equation of state of the model. The 4-brane configuration (nuclear matter) is always preferred to the string configuration (quark matter), and the latter is also unstable to density fluctuations. In the deconfined phase the phase diagram has three regions corresponding to the vacuum, quark-gluon plasma, and nuclear matter, with a first-order and a second-order phase transition separating the phases. We find that for a large baryon number density, and at low temperatures, the dominant phase has broken chiral symmetry. This is in qualitative agreement with studies of QCD at high density.

Cluster algebras and Weil-Petersson forms

Abstract: In our paper [GSV], we discussed Poisson properties of cluster algebras of geometric type for the case of a nondegenerate matrix of transition exponents. In this paper, we consider the case of a general matrix of transition exponents. Our leading idea is that a relevant geometric object in this case is a certain closed 2-form compatible with the cluster algebra structure. The main example is provided by Penner coordinates on the decorated Teichmuller space, in which case the above form coincides with the classical Weil-Petersson symplectic form.