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Search Results: 1 - 10 of 832 matches for " Shlomo Zach "
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Multi-rate asynchronous sampling of bandwidth-limited signals
Alfred Feldster,Yuval P. Shapira,Moshe Horowitz,Amir Rosenthal,Shlomo Zach,Lea Singer
Physics , 2008,
Abstract: We demonstrate experimentally an optical system for under-sampling several bandwidth limited signals with carrier frequencies that are not known apriori that can be located anywhere within a very broad frequency region between 0-18 GHz. The system is based on under-sampling asynchronously at three different sampling rates. The pulses required for the under-sampling are generated by a combination of an electrical comb generator and an electro-absorption modulator. To reduce loss and improve performance the implementation of the optical system is based on a wavelength division multiplexing technique. An accurate reconstruction of both the phase and the amplitude of the signals was obtained when two chirped signals generated simultaneously were sampled.
Anesthetic Management of a Patient with Hermansky-Pudlak Syndrome  [PDF]
Kelly Zach, Lopa Misra
Open Journal of Anesthesiology (OJAnes) , 2015, DOI: 10.4236/ojanes.2015.52007
Abstract: Hermansky-Pudlak Syndrome (HPS) is a rare genetic condition characterized by platelet function abnormalities and oculocutaneous albinism. Other systemic manifestations of the disease include pulmonary fibrosis, granulomatous colitis, impaired renal function, and cardiomyopathy. Due to the systemic extent of the disease, HPS has multiple anesthetic concerns and requires a detailed preoperative evaluation and close perioperative monitoring.
Autonomy, Choice, and Pupils’ Motivation—Are They Really Related?  [PDF]
Sima Zach, Einat Yanovich
Advances in Physical Education (APE) , 2015, DOI: 10.4236/ape.2015.52011
Abstract: Purpose: Examining the differences in motivation between learners in schools with a choice-based physical education (PE) curriculum and those with a non-choice-based curriculum, and identifying which sport activities these students prefer, using SDT as a conceptual framework. Method: Participants were 536 pupils from grades 10 - 12 from eight schools. Four schools offered a choice- based curriculum in PE and the other operated according to a teacher-based curriculum. A questionnaire examined their PA habits in leisure time, their motives for activity in PE lessons, and their preferred activities in these lessons. Results showed that pupils in classes with no choice-based curricula reported higher levels of motives then pupils in classes with choice-based curricula. Girls reported higher level of motives than boys. Preferred areas of activity illustrated the traditional-social difference between boys and girls. Conclusion: Schools that offer choice-based curricula should sharpen the answer to the question-what constitutes a worthwhile or true choice.
Predicting genes associated with prostate cancer
Zach Perlman
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports033
Abstract: The authors use their 'guilt-by-association' strategy to screen 522 human cDNA libraries for genes related in expression pattern to a set of five proteins previously linked to prostate cancer. They obtain four known genes - MAT8, neuropeptide Y, sorbitol dehydrogenase and ZN-β-2 glycoprotein - each previously reported to be associated with cancer or toxin damage, and eight previously unreported genes, seven of which have no known homologs. The eighth novel gene is a prostate-specific serine protease. To control for the possibility that the screen might be identifying tissue-specific expression rather than disease-related patterns, the authors screen a set of 52 libraries derived from male reproductive tissues and obtain similar results. Given that the genes show similar patterns of association across samples all from the same type of tissue, the apparent link to prostate cancer is likely to be related to the disease state, not the tissue of origin.Other approaches to the analysis of large databases of expression data can be found at the Stanford genomic resources site. The cDNA libraries screened in this paper are commercially available from Incyte Genomics and can be ordered via the Incyte products pages.It is not entirely clear whether the binary approach used in this paper yields significantly more useful results than those obtained from other techniques of coexpression analysis, and the authors do not make a rigorous comparison to support this claim. On the other hand, the seven new genes detected are certainly likely to be interesting both as subjects for biological investigation and as potential drug targets. This paper also publicizes the wide range of tissues and disease states for which Incyte has cDNA libraries.Genome ResearchStanford genomic resourcesIncyte GenomicsIncyte products
Pass the Crayons: Leadership, Art Production, and Communities of Practice
Zach Kelehear
International Journal of Education Policy and Leadership , 2010,
Abstract: The results of an arts-based leadership (Kelehear, 2006, 2008) practice at a rural middle school in South Carolina are examined. The school principal and art teacher led a day-long staff development and followed up individually to assist teachers to create art as metaphor for individual growth plans as well as school improvement plans. Specifically, the arts-based initiative sought to invite professional conversations that focused on: 1) personal reflections, 2) multiple perspectives, and 3) art making. Findings suggest that when the art teacher and principal work in collaboration, there is real value in an arts-based leadership practice. Also, when led by the art teacher, teacher reflections suggested that as the principal worked alongside the teachers, they felt valued and supported and viewed the principal as authentic and trusting. Additionally, out of the engendered trust, the teachers were emboldened to consider innovative, arts-based approaches to their teaching. Finally, there was evidence that the art teacher was highly effective in introducing innovative leadership practices as teachers. This study is one of several implementation studies emerging from earlier research on arts-based leadership.
Arts-based instructional leadership: Crafting a supervisory practice that supports the art of teaching
ZACH KELEHEAR
International Journal of Education Policy and Leadership , 2008,
Abstract: If teaching at its best is an art (Davis, 2005; Sarason, 1999; Grumet, 1993; Eisner, 1985; Barone, 1983; Greene, 1971; Smith 1971), then instructional leadership of teaching, done best, must also be based in art (Behar-Horenstein, 2004; Klein, 1999; Eisner, 1983 & 1998a; Blumberg, 1989; Barone, 1998). The author examines possible applications of an arts-based approach to instructional leadership (Blumberg, 1989; Pajak, 2003; Barone, 1998). Building on the research base regarding instructional leadership as art form, the author combines the Feldman Method (Feldman, 1995) of critique, Eisner’s (1998) notion of connoisseurship, and Ragans’ (2005) articulation of the elements of art and the principles of design to construct a practice that captures both the technical craft of teaching and the aesthetic dimensions evident in artistic pedagogy (Eisner, 1983; Sarason, 1999). Preliminary results of an ongoing implementation study are presented.
Bounding symbolic powers via asymptotic multiplier ideals
Zach Teitler
Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica , 2009,
Abstract: We revisit a bound on symbolic powers found by Ein-Lazarsfeld-Smith and subsequently improved by Takagi-Yoshida. We show that the original argument of [6] actually gives the same improvement. On the other hand, we show by examples that any further improvement based on the same technique appears unlikely. This is primarily an exposition; only some examples and remarks might be new.
The Lessons of Genocide
Zach Dubinsky
Essex Human Rights Review , 2005,
Abstract: Book Review: Linda Melvern, Conspiracy to Murder: The Rwandan Genocide
A new method for estimating the bolometric properties of Ibc SNe
Zach Cano
Physics , 2013, DOI: 10.1093/mnras/stt1048
Abstract: The bolometric properties (nickel mass, ejecta mass and kinetic energies) of 61 Ibc supernovae (SNe), including 20 Gamma-Ray Burst and X-Ray Flash (GRB/XRF), 19 Ib, 13 Ic and 9 Ic-BL (broad-lined) SNe are presented. All of the available $BVRI$ photometry in the literature have been collected and used in a new method that utilizes a template supernova (SN 1998bw) and an analytical model based on Arnett (1982) to accurately estimate the bolometric properties of each SN. A statistical analysis of the bolometric properties is then performed, where it is found that GRB/XRF SNe are the most energetic, and eject more mass (including nickel content) than Ib, Ic and Ic-BL SNe. The results are then compared to the existing progenitor models of Ibc SNe, where it is concluded that it is highly likely that at least two progenitor channels exist for producing a Ibc SN: most Ibc SNe arise via binary interactions, where the mass of the stellar progenitor is less than what is attributed to a Wolf Rayet star. Conversely, the progenitors of Ic-BL and GRB/XRF are more massive than those of Ib and Ic SNe, though a key difference between them is progenitor metallicity, with Ic-BL SNe arise from more metal rich progenitors. As mass loss in massive stars is influenced by metal content, the progenitors of Ic-BL SNe lose more mass, and therefore more angular momentum, before exploding. It is expected that the explosion mechanism in Ic-BL and GRB/XRF SNe is ``engine-driven'' (i.e. an accreting black hole, or a millisecond magnetar), but the increased mass loss of Ic-BL SNe means the central engine is less powerful than in GRB/XRF SNe. Finally, it is found that the SNe that accompany GRBs and XRFs are statistically indistinguishable, and some mechanism other than metallicity is needed to explain the differences in the high-energy components in these events.
The Nature of Gamma Ray Burst Supernovae
Zach Cano
Physics , 2012,
Abstract: Gamma Ray Bursts (GRBs) and Supernovae (SNe) are among the brightest and most energetic physical processes in the universe. It is known that core-collapse SNe arise from the gravitational collapse and subsequent explosion of massive stars (the progen- itors of nearby core-collapse SNe have been imaged and unambiguously identified). It is also believed that the progenitors of long-duration GRBs (L-GRBs) are massive stars, mainly due to the occurrence and detection of very energetic core-collapse su- pernovae that happen both temporally and spatially coincident with most L-GRBs. However many outstanding questions regarding the nature of these events exist: How massive are the progenitors? What evolutionary stage are they at when they explode? Do they exist as single stars or in binary systems (or both, and to what fractions)? The work presented in this thesis attempts to further our understanding at the types of progenitors that give rise to long-duration GRB supernovae (GRB-SNe). This work is based on optical photometry obtained for three GRB-SNe events: GRB 060729, GRB 090618 and XRF 100316D (an X-Ray Flash is similar to a L-GRB, but has a lower peak energy). For GRB 060729 and GRB 090618 we model the optical light curves and account for light coming from three sources: the host galaxy, the afterglow and the supernova. When we remove the host flux, and model the afterglow, the re- maining flux resembles that of a SN, both in the shape of the light curve and the shape of the spectral energy distribution. Our investigation of XRF 100316D and its spectroscopically-confirmed Ic-BL SN 2010bh is more detailed as we were able to obtain optical and infrared data in many filters, which we utilize to created a quasi-bolometric light curve that we model to determine physical parameters of the SN...
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