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Kinetic isotope effects of atom-transfer reactions and their temperature dependences at high temperatures have been calculated for various hydrogen-atom–formaldehyde reactions. In the case of the “abstracting atom” kinetic isotope effect, a negative temperature coefficient is predicted in the high-temperature limit. The theoretical calculations are compared with experimental results in the literature and satisfactory agreement is obtained.
We show that Supernova (SN) 2002kg in NGC 2403, initially classified as Type II-narrow (IIn), has photometric and spectroscopic properties unlike those of normal SNe. Its behavior, instead, is more typical of highly massive stars which experience the short-lived luminous blue variable (LBV) phase toward the end of their lives. The star, in fact, most resembles the LBV S Doradus in outburst. The precursor of SN 2002kg is the irregular, bright blue variable star 37 (V37), catalogued by Tammann & Sandage in 1968. Using high-quality ground-based, multi-band images we can constrain the initial mass of V37 to be M_ini >~ 40 M_sun. We find that, although the spectra indicate a nitrogen enhancement, possibly revealing the products of CNO processing by V37 in the ejecta, the star lacks a substantial LBV nebula. The outburst from SN 2002kg/V37 is not nearly as energetic as the giant eruptions of the eta Carinae-like variables, such as SN 1954J/V12, also in NGC 2403. SN 2002kg/V37, however, is among a growing number of ``SN impostors'' exhibiting a broad range of outburst energetics during a pre-SN phase of massive-star evolution.
In the early 1990s, Mayor Rudolph Giuliani launched a zero-tolerance campaign aimed at street disorders and petty offenders, incarnated in the infamous squeegee man. New York City soon became a planetary showcase for an aggressive approach to law enforcement that, despite its extravagant costs and the absence of connection to the crime drop, came to be admired and imitated by other cities in the United States, Western Europe, and Latin America. In Prisons of Poverty, Loic Wacquant tracks the incubation and internationalization of the slogans, theories, and measures composing this new punitive common sense, fashioned to curb mounting urban inequality and marginality in the metropolis. He finds that a network of Reagan-era conservative think tanks (led by the Manhattan Institute) forged them as weapons in their crusade to dismantle the welfare state and, in effect, to criminalize poverty. He traces their import and export through the agency of the media and the pro-market policy institutes that have mushroomed across the European Union, particularly in Tony Blair's Britain. And he shows how local academics helped smuggle U.S. techniques of penalization into their countries by dressing them up in scholarly garb. Now available in English for the first time in an expanded edition, Prisons of Poverty reveals how the Washington consensus on economic deregulation and welfare retrenchment was extended to encompass punitive crime control because the invisible hand of the market necessitates and calls forth the iron fist of the penal state.
Abstract Purpose Although much research has been done on accountable care organizations (ACOs), little is known about their impact on rural hospitals. We examine the association between rural hospitals’ participation in an ACO and their performance on utilization and financial measures. Methods This quasi‐experimental study estimates the relationship between voluntary ACO participation and hospital metrics using propensity score‐matched, longitudinal regression models with year and hospital fixed effects. Regression models controlled for secular trends and time‐varying hospital and county characteristics. Hospital measures were from the American Hospital Association, RAND Hospital Data, and Leavitt Partners. The initial population comprises 643 rural hospitals that participated in an ACO for at least one year during the 2011 to 2018 study period and 1,541 rural hospitals that did not participate in an ACO. From this population we created a sample of propensity score‐matched hospitals consisting of 525 ACO‐participating and 525 comparable non‐ACO hospitals. Results Rural hospitals’ participation in an ACO is not associated with changes in hospital utilization or financial measures, nor is there an association between these performance metrics and whether another within‐county hospital participated in an ACO. A secondary analysis limited to Critical Access Hospitals provides some evidence that inpatient utilization increases in the second year of ACO participation, though the increases are not significant in year 3 and beyond. Conclusion We find no evidence that rural hospitals experience substantive changes in outpatient visits, inpatient utilization, or operating margin in the years immediately after joining an ACO.
in reasonably good agreement with their value.Moreover, Eq. (5) shows that a is the same whether the reactant is H 2CO or D 2 CO.Applied to the other isotopic variants of this reaction discussed by TRM, the method gives results in substantial agreement with theirs.The slight differences that were found probably arise from small errors in their calculation of vibrational frequencies, I have recalculated these, using their assumed force constants and molecular geometry in the Schachtschneider-Snyder program,6 and obtain vibrational frequencies slightly different from those reported by TRM.
In this work, using quasiconvexity and rank-one convexity conditions in Cosserat elasticity theory, we derive the Maxwell–Eshelby relation for Cosserat bodies with a surface of discontinuity.
© 2016 The Author(s). While the ab initio prediction of the properties of solids and their optimization towards new proposed materials is becoming established, little predictive theory exists as to which metastable materials can be made and how, impeding their experimental realization. Here we propose a quasi-thermodynamic framework for predicting the hydrothermal synthetic accessibility of metastable materials and apply this model to understanding the phase selection between the pyrite and marcasite polymorphs of FeS2. We demonstrate that phase selection in this system can be explained by the surface stability of the two phases as a function of ambient pH within nano-size regimes relevant to nucleation. This result suggests that a first-principles understanding of nano-size phase stability in realistic synthesis environments can serve to explain or predict the synthetic accessibility of structural polymorphs, providing a guideline to experimental synthesis via efficient computational materials design.
Article Free Access Share on Image-based rendering (panel): really new or déjà vu? Authors: Michael Cohen Microsoft Research Microsoft ResearchView Profile , Marc Levoy Stanford University Stanford UniversityView Profile , Jitendra Malik University of California, Berkeley University of California, BerkeleyView Profile , Leonard McMillan Massachusetts Institute of Technology Massachusetts Institute of TechnologyView Profile , Eric Chen Live Picture Live PictureView Profile Authors Info & Claims SIGGRAPH '97: Proceedings of the 24th annual conference on Computer graphics and interactive techniquesAugust 1997 Pages 468–470https://doi.org/10.1145/258734.258911Published:03 August 1997Publication History 5citation426DownloadsMetricsTotal Citations5Total Downloads426Last 12 Months7Last 6 weeks2 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF
ADVERTISEMENT RETURN TO ISSUEEditorialNEXTThe Joy of SynthesisChristopher J. ChangView Author Information Departments of Chemistry and Molecular and Cell Biology, the Howard Hughes Medical Institute, and the Helen Wills Neuroscience Institute, University of California Chemical Sciences Division, Lawrence Berkeley National LaboratoryE-mail: [email protected]Cite this: ACS Cent. Sci. 2015, 1, 8, 409Publication Date (Web):November 25, 2015Publication History Published online25 November 2015Published inissue 25 November 2015https://doi.org/10.1021/acscentsci.5b00355Copyright © 2015 American Chemical SocietyRIGHTS & PERMISSIONSACS AuthorChoiceArticle Views2193Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (171 KB) Get e-AlertsSUBJECTS:Animal derived food,Elements,Food,Nucleic acid structure,Receptors Get e-Alerts
