ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasma-initiated polymerization of hexachlorocyclotriphosphazeneJames A. Klein, Alexis T. Bell, and David S. SoongCite this: Macromolecules 1987, 20, 4, 782–789Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1 April 1987https://pubs.acs.org/doi/10.1021/ma00170a014https://doi.org/10.1021/ma00170a014research-articleACS PublicationsRequest reuse permissionsArticle Views160Altmetric-Citations12LEARN 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 InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Cet article élabore l’ontologie et la méthodologie sociales de la sociologie charnelle comme mode distinctif d’investigation déjouant la posture spectatrice pour saisir l’action-en-trainde-se-faire, dans le sillage des débats suscités par mon enquête par apprentissage sur la boxe comme art du corps plébéien. Je critique d’abord les notions (dualiste) d’agent, (externaliste) de structure et (mentaliste) de connaissance qui régentent les sciences sociales contemporaines et j’ébauche une conception alternative de l’animal social considéré non pas comme un simple manipulateur de symboles mais comme une créature de chair et de sang sensible, souffrante, sachant-faire, sédimentée et située. Je mets en exergue la primauté du savoir pratique incorporé qui survient des trames d’action dans lesquelles il est continuellement imbriqué, et j’examine quelles sont les modalités d’enquête aptes à déployer et à tirer profit de cette conception incarnée de l’agent. Je soutiens que l’ ethnographie énactive , variante du travail de terrain par immersion fondée sur l’« effectuation du phénomène », ouvre une voie féconde pour saisir les schèmes cognitifs, conatifs et cathectiques (habitus) qui génèrent les conduites et sous-tendent le cosmos considéré. Mais il faut de l’audace et de la ténacité sociales pour tirer parti de la « participation observante » et atteindre la compétence sociale (par opposition à la saturation empirique). Je reviens en conclusion sur le dialogue de Bourdieu avec Pascal afin de soupeser les difficultés et de souligner l’urgence de saisir l’« esprit de finesse » qui anime toute compétence mais qui disparaît des comptesrendus de la science sociale normale.
Redox potential measurements on platinum and Type 304 stainless steel in equilibrium ( or ) and nonequilibrium boric acid/lithium hydroxide solutions at 275°C are reported. For equilibrium systems containing hydrogen, good agreement was obtained between the measured potentials on platinum and calculated equilibrium potentials for pH . For highly basic systems , however, the observed potentials tended to be more positive than the calculated values; the difference was probably due to trace amounts of oxygen remaining in the system. In oxygenated equilibrium systems, good agreement was found between the observed and calculated potentials for the solution for , but the observed potentials tended to be less positive than the calculated values for more acidic solutions and for lower oxygen concentrations. Steady‐state measurement on nonequilibrium boric acid solutions at 275°C showed that the redox potential on platinum becomes more negative as the ratio increases. Transient studies on nonequilibrium boric acid solution revealed that the redox potential can vary over a wide range on cycling the relative concentrations of oxygen and hydrogen. The experimental findings are interpreted in terms of mixed potential model from which numerical simulations have reproduced the essential features of the data.
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTPt−Ag Catalyst System for Hydroarylations with Unactivated Arenes and OlefinsDmitry Karshtedt, Alexis T. Bell, and T. Don TilleyView Author Information Department of Chemistry and Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 Cite this: Organometallics 2004, 23, 18, 4169–4171Publication Date (Web):July 29, 2004Publication History Received26 June 2004Published online29 July 2004Published inissue 1 August 2004https://pubs.acs.org/doi/10.1021/om0495325https://doi.org/10.1021/om0495325rapid-communicationACS PublicationsCopyright © 2004 American Chemical SocietyRequest reuse permissionsArticle Views1555Altmetric-Citations101LEARN 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 InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information SUBJECTS:Aromatic compounds,Arylation,Catalysts,Hydrocarbons,Platinum Get e-Alerts
Chemically vapor deposited (CVD) diamond films have been deposited by a microwave enhanced deposition process on metal substrates including titanium, tungsten, molybdenum, and copper. Boundary reaction layers formed at the interface during the growth of the CVD diamond films have been investigated for each of these systems. In these studies, the interface has been exposed by mechanically deforming the metal substrate to cause film delamination. Where the diamond film has adhered to the substrate through the growth process, delamination procedures have been carried out under controlled conditions in order to preserve the integrity of the interfacial species. The exposed interfaces were characterized by x-ray photoelectron spectroscopy, scanning Auger microscopy, secondary electron microscopy, and Raman microprobe spectroscopy. Reaction layers composed of carbides and oxides of the native metal were detected at the interfaces of titanium, tungsten, and molybdenum while only traces of carbon and oxygen were detected at the diamond/copper interface. We believe that both the chemical composition and morphology of the interface influence the adhesive properties of the diamond coating. Correlated investigations of the interfacial surfaces reveal that fracture of the diamond/metal interface occurs discretely at the diamond nucleation plane or within a reaction layer near the diamond interface.
We present updated estimates of central bank for 100 countries up through 2006 and use them to analyze both the determinant and consequences of monetary policy transparency in an integrated econometric framework. We establish that there has been significant movement in the direction of greater central bank transparency in recent years. Transparent monetary policy arrangements are more likely in countries with strong and stable political institutions. They are more likely in democracies, with their culture of transparency. Using these political determinants as instruments for transparency, we show that more transparency monetary policy operating procedures are associated with less inflation variability though not also with less inflation persistence.
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Trypsin immobilization onto continuous "molded" rods of porous poly(glycidyl methacrylate-co-ethylene dimethacrylate) and some applications of the conjugate have been studied. The rods polymerized within a tubular mold (chromatographic column), were treated in situ with ethylenediamine, activated with glutaraldehyde and finally modified with trypsin. The performance of the trypsin-modified rods was evaluated and compared to that of poly(glycidyl methacrylate-co-ethylene dimethacrylate) beads, modified with the same enzyme. Overall the enzyme-modified rods performed substantially better than the corresponding beads. In particular, the performance of the molded supports as enzymatic reactors or as chromatographic media benefits greatly from the enhanced mass transfer that is characteristic of the molded rod at high flow rates. © 1996 John Wiley & Sons, Inc.
The surface nanomechanical properties and morphology of ∼500-μm-thick polyurethane films subjected to normal loads in the range of 3–35 nN and longitudinal strains up to 150% were investigated with an atomic force microscope. Nanoindentation experiments performed at very low loads and small penetration depths demonstrated that the elastic behavior of the polyurethane surface is remarkably different from that of the bulk material. The distinctly different mechanical response to applied pressure between surface and near-surface (bulk) regions of the polymer is attributed to packing of the polymer chains at the contact region. The polyurethane copolymer consists of two immiscible hard and soft segments. It is suggested that upon stretching, randomly oriented hard segments migrate to the surface, leading to an increase of the hard-to-soft segment concentration and a decrease of the surface roughness. A general description of the polyurethane surface and bulk behavior under stretching and compression is presented in the context of the obtained results.
