978 research outputs found
Hearing the grass grow. Emotional and epistemological challenges of practice-near research
This paper discusses the concept of practice-near research in terms of the emotional and epistemological challenges that arise from the researcher coming 'near' enough to other people for psychological processes to ensue. These may give rise in the researcher to confusion, anxiety and doubt about who is who and what is what; but also to the possibility of real emotional and relational depth in the research process. Using illustrations from three social work doctoral research projects undertaken by students at the Tavistock Clinic and the University of East London the paper examines four themes that seem to the author to be central to meaningful practice-near research undertaken in a spirit of true emotional and epistemological open-mindedness: the smell of the real; losing our minds; the inevitability of personal change; and the discovery of complex particulars
Low Catalyst Loadings in Olefin Metathesis: Synthesis of Nitrogen Heterocycles by Ring-Closing Metathesis
A series of ruthenium catalysts have been screened under ring-closing metathesis (RCM) conditions to produce five-, six-, and seven-membered carbamate-protected cyclic amines. Many of these catalysts demonstrated excellent RCM activity and yields with as low as 500 ppm catalyst loadings. RCM of the five-membered carbamate series could be run neat, the six-membered carbamate series could be run at 1.0 M, and the seven-membered carbamate series worked best at 0.2−0.05 M
The adsorption of helium atoms on coronene cations
We report the first experimental study of the attachment of multiple foreign
atoms to a cationic polycyclic aromatic hydrocarbon (PAH). The chosen PAH was
coronene, C24H12, which was added to liquid helium nanodroplets and then
subjected to electron bombardment. Using mass spectrometry, coronene cations
decorated with helium atoms were clearly seen and the spectrum shows peaks
with anomalously high intensities (“magic number” peaks), which represent ion-
helium complexes with added stability. The data suggest the formation of a
rigid helium layer consisting of 38 helium atoms that completely cover both
faces of the coronene ion. Additional magic numbers can be seen for the
further addition of 3 and 6 helium atoms, which are thought to attach to the
edge of the coronene. The observation of magic numbers for the addition of 38
and 44 helium atoms is in good agreement with a recent path integral Monte
Carlo prediction for helium atoms on neutral coronene. An understanding of how
atoms and molecules attach to PAH ions is important for a number of reasons
including the potential role such complexes might play in the chemistry of the
interstellar medium
Topological Andr\'e-Quillen homology for cellular commutative -algebras
Topological Andr\'e-Quillen homology for commutative -algebras was
introduced by Basterra following work of Kriz, and has been intensively studied
by several authors. In this paper we discuss it as a homology theory on CW
-algebras and apply it to obtain results on minimal atomic -local
-algebras which generalise those of Baker and May for -local spectra and
simply connected spaces. We exhibit some new examples of minimal atomic
-algebras.Comment: Final revision, a version will appear in Abhandlungen aus dem
Mathematischen Seminar der Universitaet Hambur
Ratification vote on taxonomic proposals to the International Committee on Taxonomy of Viruses (2016)
This article lists the changes to virus taxonomy approved and ratified by the International Committee on Taxonomy of Viruses (ICTV) in April 2016.
Changes to virus taxonomy (the Universal Scheme of Virus Classification of the International Committee on Taxonomy of Viruses [ICTV]) now take place annually and are the result of a multi-stage process. In accordance with the ICTV Statutes (http://www.ictvonline.org/statutes.asp), proposals submitted to the ICTV Executive Committee (EC) undergo a review process that involves input from the ICTV Study Groups (SGs) and Subcommittees (SCs), other interested virologists, and the EC. After final approval by the EC, proposals are then presented for ratification to the full ICTV membership by publication on an ICTV web site (http://www.ictvonline.org/) followed by an electronic vote. The latest set of proposals approved by the EC was made available on the ICTV website by January 2016 (https://talk.ictvonline.org/files/proposals/). A list of these proposals was then emailed on 28 March 2016 to the 148 members of ICTV, namely the EC Members, Life Members, ICTV Subcommittee Members (including the SG chairs) and ICTV National Representatives. Members were then requested to vote on whether to ratify the taxonomic proposals (voting closed on 29 April 2016)
Give us a game : evaluating the opportunities that exist for English footballers to play in the English Premier League
The purpose of this study was to provide a detailed, large-scale retrospective analysis of the number of English footballers that have been developed to play in the English Premier League (EPL) over twenty seasons. Unlike previous research, we examined appearance data as opposed to percentage of squad data enabling a more accurate representation of English players appearing in the EPL. The findings revealed a steady decline in the number and proportion of appearances made by English players in the EPL throughout the twenty season period. However, the results also indicated that the rate of decline had abated since the inception of UEFA's home-grown rule. The results support the view that opportunities for indigenous players have diminished since the EPL's inception. Given the short-term, results-focused culture that prevails in the EPL, this would appear to present a major challenge for governing bodies, particularly those working in elite player development. Discussion surrounding how these challenges might be met is presented
Highly Stable [C\u3csub\u3e60\u3c/sub\u3eAuC\u3csub\u3e60\u3c/sub\u3e]\u3csup\u3e+/-\u3c/sup\u3e Dumbbells
Ionic complexes between gold and C60 have been observed for the first time. Cations and anions of the type [Au(C60)2]+/- are shown to have particular stability. Calculations suggest that these ions adopt a C60-Au-C60 sandwich-like (dumbbell) structure, which is reminiscent of [XAuX]+/- ions previously observed for much smaller ligands. The [Au(C60)2]+/- ions can be regarded as Au(I) complexes, regardless of whether the net charge is positive or negative, but in both cases, the charge transfer between the Au and C60 is incomplete, most likely because of a covalent contribution to the Au-C60 binding. The C60-Au-C60 dumbbell structure represents a new architecture in fullerene chemistry that might be replicable in synthetic nanostructures.
Temperatures in a runaway greenhouse on the evolving Venus: implications for water loss
Recent work has established that Venus once had at least 100 times its present complement of outgassed water. An original complement of water comparable to the earth's is not inconsistent with our present knowledge (and is worthy of consideration since it involves no special assumptions concerning the differences in origin of the two planets). We use a one-dimensional calculation to investigate temperatures in the "runaway greenhouse" which may have ensued if Venus once had more than a few percent of the earth's water complement. We find that the atmosphere must exhibit an unusual structure, with condensation and presumably cloud formation taking place at high altitudes, while deep in the atmosphere the gas is strongly unsaturated with respect to water vapour. The necessity of including clouds introduces considerable uncertainty into the calculation of surface temperatures. However, for certain reasonable values of the cloud parameters, very high temperatures can be sustained, approaching the temperature of the basalt solidus. We speculate that such high temperatures may have promoted water-rock reactions, releasing free hydrogen and "burying" oxygen. A plastic or molten surface could have promoted rapid exposure of fresh rock, significantly easing the problem of disposing of the oxygen released by the dissociation of water.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/24845/1/0000271.pd
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