138 research outputs found
24 February - M. Neeman Vice President Weizmann Institute of Science signing the CERN Guest book with Director for Accelerators and Technology F. Bordry
No full textProfessor Michal Neeman Vice President Weizmann Institute of Scienc
Introduction to High Performance Computing
No full textAuthor:
Henry Neeman, University of Oklahoma
Assistant Vice President, Information Technology
Research Strategy Advisor
Director, OU Supercomputing Center for Education & Research (OSCER)
Associate Professor, College of Engineering
Adjunct Faculty, School of Computer Science"Introduction to HPC" (Henry Neeman)
presented at the Linux Cluster Institute (LCI) Workshop,
Mon May 18 2015Linux Cluster Institute
The University of Oklahoma
The University of Oklahoma Supercomputing Center for Education & Research (OSCER)N
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On the Infinitary Combinatorics of Small Cardinals and the Cardinality of the Continuum
No full textThis work is divided into two parts which are concerned, respectively, with the combinatorics of the cardinals and . The first part of the thesis contains the result due to the author and his advisor, Itay Neeman, that the Abraham-Rubin-Shelah Open Coloring Axiom is consistent with a large continuum; this answers a long-standing open question in forcing. Most of Part 1 appears in our submitted manuscript \cite{GN}. After surveying the relevant background in the first chapter, we proceed in the second chapter to define the notion of a Partition Product. This is a type of iteration built out of smaller ones in specific ways, roughly with memory conditions on the names and with isomorphism and coherence conditions on the various ``memories." We will prove a number of useful facts about partition products in Chapter 2. In Chapter 3, we show how to construct so-called Preassignments of Colors in the context of partition products; this forms the technical heart of Part 1. And finally, in Chapter 4, we show how to construct partition products in ; in particular, we construct the partition product which yields the model witnessing our theorem.Part 2 of the thesis addresses questions about a variety of combinatorial principles on . In each chapter in Part 2, we will be concerned with showing that some amount of Stationary Reflection holds at , more specifically showing that various amounts of stationary reflection are compatible with other principles of wide interest. In Chapter 5, we provide an overview of these combinatorial principles and some of their history; we also spend some time collecting standard facts about Mitchell-type forcings which we will use in the subsequent chapters. Chapter 5 concludes with a proof that various Mitchell-type posets and their quotients are proper, a result which we assume is known, but which we have not encountered ourselves elsewhere.Chapters 6 and 7 address questions arising from the recent paper \emph{The Eightfold Way} by Cummings, Friedman, Magidor, Rinot, and Sinapova (see \cite{8fold}). In Chapter 6, we answer an open question asked at the end of that paper by showing that it is consistent, from a Mahlo cardinal, that the Tree Property (\TP) and Approachability (\AP) both fail at \om_2, while stationary reflection (\RP) holds at . The authors of \cite{8fold} obtained the consistency of this same configuration from a weakly compact cardinal; our result proves the consistency of this configuration from optimal assumptions. We remark here that we present the original proof discovered by the author of this thesis. Later, the author, working with John Krueger, provided a more streamlined proof of this same result; this proof will appear in the forthcoming paper \cite{GiltonKrueger8}. Chapter 6 also includes an unrelated Easton-style lemma for preserving stationary subsets of countable cofinality; this result is due to the author and Omer Ben-Neria.In Chapter 7, we show that for any Boolean combination, , of \TP and \AP, is consistent with a strong form of simultaneous stationary reflection on , namely that every stationary S\seq\om_2\cap\cof(\om) reflects almost everywhere. This strengthens some of the results from \cite{8fold}. In Chapter 8, we return to the model from \cite{GiltonKruegerHS}, making good on a promise from the postscript therein. In \cite{GiltonKruegerHS}, the author and John Krueger originally sought to show that stationary reflection on \om_2 is consistent with a large continuum, and we built an involved mixed-support iteration to achieve such a model. However, we later learned from I. Neeman that such a model can be constructed by simply adding Cohen reals over the original Harrington-Shelah model (\cite{HS}). In Chapter 8 we will show that after a modification of our original preparatory iteration, we may obtain a model in which \RP and \AP both hold, in which 2^\om>\om_2, and in which there are neither special Aronszajn trees on \om_2 nor weak Kurepa trees on . This is a configuration which cannot be obtained simply by adding Cohen reals over the original Harrington-Shelah model nor by the methods of disjoint stationary sequences from \cite{GiltonKrueger8}. We hope that this demonstrates the usefulness of such a mixed support iteration.In the final chapter, we provide a list of open questions which we would like to address in future work
Magnetic Resonance Imaging Reveals Distinct Roles for Tissue Transglutaminase and Factor XIII in Maternal Angiogenesis During Early Mouse Pregnancy
No full textDoes Terrorism Work?
No full textThis paper examines whether terrorism is an effective tool to achieve political goals. By exploiting variation in terror attacks over time and across locations in Israel from 1984 to 2006, we show that local terror attacks cause Israelis to be: (i) more willing to grant territorial concessions to the Palestinians; (ii) more willing to accept a Palestinian state; (iii) less likely to identify oneself as being right-wing; and (iv) more likely to have a favorable opinion of Arabs. These effects are especially pronounced for individuals from particular demographic groups which are typically right-wing in their political views. In addition, we show that terror induces Israelis to vote increasingly for right-wing parties. This pattern of results demonstrates that right-wing parties are becoming more accommodating to Palestinian demands for territorial concessions. Hence, this paper shows that terrorism appears to be an effective strategy in terms of shifting the entire Israeli political landscape to the left. These findings may shed light on the causes underlying the spread of global terrorism in the last few decades.
An example of a non-Fourier-Mukai functor between derived categories of coherent sheaves
No full textOrlov’s famous representability theorem asserts that any fully faithful exact functor between the bounded derived categories of coherent sheaves on smooth projective varieties is a Fourier–Mukai functor. In this paper we show that this result is false without the fully faithfulness hypothesis. We also show that our functor does not lift to the homotopy category of spectral categories if the ground field is {\mathbb Q}.This research started at the Mathematical Sciences Research Institute in 2013 with the support
of the National Science Foundation under Grant No. 0932078 000. A number of results were
obtained during research visits of the first author to the University of Hasselt, supported by
ESF Exchange Grant 4498 in the framework of the Project “Interactions of Low-Dimensional
Topology and Geometry with Mathematical Physics (ITGP)” and by the FWO Grant
1503512N “Non-commutative algebraic geometry” and by the second author to the
International School for Advanced Studies (SISSA) at Trieste. The research by Amnon Neeman was partly supported by the Australian Research Council
Dynamic Remodeling of the Vascular Bed Precedes Tumor Growth: MLS Ovarian Carcinoma Spheroids Implanted in Nude Mice
No full textAbstractThe goal of this study was to monitor the vascular bed during the lag phase in growth of implanted spheroids as a model of tumor dormancy. Vascular development and tumor growth were followed up by magnetic resonance imaging in a model system of MILS ovarian carcinoma spheroids implanted subcutaneously in female nude mice. Apparent vessel density in a 1-mm rim surrounding the spheroid was evaluated by gradient echo imaging as a measure of the angiogenic potential of the tumor. Vascular functionality and maturation were assessed by signal intensity changes in response to hyperoxia (elevated oxygen) and hypercapnia (elevated carbon dioxide), respectively. Tumor growth was delayed by 12 to 57 days after implantation. During this long period in which tumor volume did not change, up to 6 cycles of vascular development and regression were observed. We propose here that dynamic remodeling of the vascular bed may precede exit of tumors from dormancy. The sustained oscillations in the angiogenic response to the implanted spheroid are consistent with hypoxic regulation of vascular endothelial growth factor (VEGF), combined with the role of VEGF as an essential survival factor for newly formed blood vessels. Vascular maturation, manifested by physiological vasodilatory response to carbon dioxide, may be important for conferring vascular stability and exit from dormancy
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