1,845 research outputs found
Glaciambulata Galea, gen. nov.
No full textGenus Glaciambulata Galea, gen. nov. urn:lsid:zoobank.org:act:B2696364-D58F-4BB9-B326-DE244E1FA51A Type species Glaciambulata neumayeri gen. et sp. nov. Diagnosis Crawling medusae, unable to swim, possibly due to the absence of a velum. Umbrella watch glassshaped, margin entire, not lobed; exumbrella smooth; eight radial canals joining a circular canal; centripetal canals absent; manubrium eight-lobed, giving rise to eight perradial mesenteries; eight pairs of gonads, each of which is conFned to either side of a manubrial lobe; tentacles of two types, Fliform and adhesive, arranged in contiguous groups composed of several superimposed rows; 16 free, ectoendodermal statocysts (2 per octant). Etymology From the Latin words glăciēs, meaning ice, and ambŭlo, -āvī, -ātum, -āre, meaning to walk, making reference to the peculiar habit of this medusa. Remarks The Fat, smooth umbrella, and the absence of a velum immediately distinguish the new genus from Ptychogastria Allman, 1878 and Tesserogastria Beyer, 1959. The manubrial shape, the composition and arrangement of tentacles, the presence of mesenteries, and the shape and position of the gonads, are reminiscent of Ptychogastria. The presence of adhesive tentacles, and of 16 statocysts, instead of only 8, further distinguish it from Tesserogastria.Published as part of Horia R. Galea, Cornelia Roder, Christoph Walcher, Marco Warmuth, Eberhard Kohlberg & Philipp F. Fischer, 2016, Glaciambulata neumayeri gen. et sp. nov., a new Antarctic trachymedusa (Cnidaria: Hydrozoa), with a revision of the family Ptychogastriidae, pp. 1-30 in European Journal of Taxonomy 252 on page 5, DOI: 10.5852/ejt.2016.252, http://zenodo.org/record/22125
The final examination in medicine : time for change?
No full textMost medical programmes culminate in a final assessment, in order that participants may be tested and graded. In June 1995, at the University of Malta, a group of 53 medical students sat for their final examination; medicine was one of the three co-equal component subjects of this statutory qualifying examination. The scope of this paper is to analyze the results obtained in the final examination in medicine and to use this data to address such issues as aims of this examination, method and quality assurance of assessment. The result obtained by candidates in the final examination in medicine was correlated with their university entry qualifications. The composite mark for each candidate was split into its components and analysis took the form of description, correlation and clustering. Computation of Cronbach’s alpha facilitated anlaysis of reliability of each of the three parts of the examination. The findings of this paper suggest that there is room for improving the quality of assessment methods. A review of methods and procedures, with the dual purpose of decreasing bias and increasing specificity and sensitivity of this statutory examination will not only benefit candidates, but ultimately also the University of Malta. The final qualifying examination in medicine should have clearly defined objectives and methods of assessment should be aimed specifically at reaching them. It needs to be able to assess the ability to think critically about diagnosis and management and to ensure that the candidate has a satisfactory base of factual knowledge. It also needs to assess objectively the adequacy of basic clinical skills and candidates’ facility of communication.peer-reviewe
Globalization of Distinguished Supercuspidal Representations of GL(n)
No full textAn irreducible supercuspidal representation of = GL(n, ), where is a nonarchimedean local field of characteristic zero, is said to be “distinguished” by a subgroup of and a quasicharacter of if Hom(, ) ≠ 0. There is a suitable global analogue of this notion for an irreducible, automorphic, cuspidal representation associated to GL(n). Under certain general hypotheses, it is shown in this paper that every distinguished, irreducible, supercuspidal representation may be realized as a local component of a distinguished, irreducible automorphic, cuspidal representation. Applications to the theory of distinguished supercuspidal representations are provided
Restriction of Representations of GL (n + 1, ℂ) to GL (n, ℂ) and Action of the Lie Overalgebra
No full textConsider a restriction of an irreducible finite dimensional holomorphic representation of GL(n+1,C) to the subgroup GL(n,C). We write explicitly formulas for generators of the Lie algebra gl(n+1) in the direct sum of representations of GL(n,C). Nontrivial generators act as differential-difference operators, the differential part has order n − 1, the difference part acts on the space of parameters (highest weights) of representations. We also formulate a conjecture about unitary principal series of GL(n,C).© The Author(s) 201
The Balanced Voronoi Formulas for
No full textAbstract
In this article, we show how the Voronoi summation formula of [13] can be rewritten to incorporate hyper-Kloosterman sums of various dimensions on both sides. This generalizes a formula for with ordinary Kloosterman sums on both sides that was used in [1] to prove nonvanishing of GL(4) -functions by GL(2)-twists, and later by the second-named author in [16].</jats:p
Bethe Vectors for Composite Models with gl(2|1) and gl(1|2) Supersymmetry
No full textSupersymmetric composite generalized quantum integrable models solvable by the algebraic Bethe ansatz are studied. Using a coproduct in the bialgebra of monodromy matrix elements and their action on Bethe vectors, formulas for Bethe vectors in the composite models with supersymmetry based on the super-Yangians Y[gl(2|1)] and Y[gl(1|2)] are derived.The author wants to express his gratitude to N.A. Slavnov for the proposal to investigate this
topic and discussions. He thanks also to S. Pakuliak for discussions and to A.P. Isaev and
C. Burd´ık for their support. The work of the author has been supported by the Grant Agency ˇ
of the Czech Technical University in Prague, grant No. SGS15/215/OHK4/3T/14, and by the
Grant of the Plenipotentiary of the Czech Republic at JINR, Dubna
Combinatorial results on (1,2,1,2)-avoiding -orbit closures on
No full text35 pages, 18 figuresInternational audienceUsing recent results of the second author which explicitly identify the "-avoiding" -orbit closures on the flag manifold as certain Richardson varieties, we give combinatorial criteria for determining smoothness, lci-ness, and Gorensteinness of such orbit closures. (In the case of smoothness, this gives a new proof of a theorem of W.M. McGovern.) Going a step further, we also describe a straightforward way to compute the singular locus, the non-lci locus, and the non-Gorenstein locus of any such orbit closure. We then describe a manifestly positive combinatorial formula for the Kazhdan-Lusztig-Vogan polynomial in the case where corresponds to the trivial local system on a -avoiding orbit closure and corresponds to the trivial local system on any orbit contained in . This combines the aforementioned result of the second author, results of A. Knutson, the first author, and A. Yong, and a formula of Lascoux and Sch\"{u}tzenberger which computes the ordinary (type ) Kazhdan-Lusztig polynomial whenever is cograssmannian
The Acquisition of Grey Literature in Developing Countries
No full textGL constitutes an important information collection in research and university libraries. Despite its eminent value and importance to both scholars and scientists, the procurement of these collection poses serious problems to information professionals. These problems are particularly serious in he third world where bibliographic control activities have yet to catch up with the developed world. This project will therefore attempt to analyse the practice and problems associated with the procurement of this collection in the developing world. The aims and objectives are: to examine the procurement of GL in developing countries; to critically examine the various acquisition methods employed in the procurement of the collection; to analyse the problems experienced in their procurement; to propose solutions to the stated problems. The author hopes to base his study on the following research methodologies. Literature Review: Will be made to scan all documentary information related to the above subject. Much information is anticipated from journal articles, conference papers and to a limited extent, books. Interview: The author hopes to interview a number of people on the subject in Kenya. Among them will be information professionals in university and research libraries; and researchers and scholars who by nature of their programmes use unpublished literature. For information professionals outside Kenya, the author hopes to write to a selected few to seek their views on specific issues. Author's Experience: The author also hopes to draw on his considerable experience as an acquisition librarian in special and research libraries in the third world. The conclusion will be based on the research findings. The research will no doubt highlight the problems existing in the area of GL acquisition and their possible solutions.Includes: Conference preprint, Pratt student commentaryXAInternationa
On nonemptiness of Newton strata in the -Grassmannian for
No full textWe study the Newton stratification in the -Grassmannian for
associated to an arbitrary (possibly nonbasic) element of
. Our main result classifies all nonempty Newton strata in an
arbitrary minuscule Schubert cell. For a large class of elements in
, our classification is given by some explicit conditions in
terms of Newton polygons. For the proof, we proceed by induction on n using a
previous result of the author that classifies all extensions of two given
vector bundles on the Fargues-Fontaine curve.Comment: 21 pages, 8 figures, improved expositio
The author/respondent relationship with grey literature : a study in unperformed informal communication
No full textThe author/respondant relationship with grey literature: a study in unperformed informal communication Grey literature is generally supposed to be a medium for informal scientific communication. I shall present the results of an empirical survey of the Information Centre for the Social Sciences (Bonn, F.R.G.) with 1,600 Social Scienctists showing a rather strange and contradictory situation: Although there are strong efforts towards the dissemination of grey literature, there is only very little feed back by the receivers of the papers no matter whether they are personally known to the author or not. The strangest result, however, is that the authors hardly make any use of this feed back, of critical remarks or suggestions, although they make strong efforts towards reworking their papers for subsequent formal publications. They change each and everything - text, data/tables, appendices etc. -, but communication does not seem to have any remarkable influence. So, what is the production and dissemination of GL for? What are the reasons and expectations of authors disseminating their papers (and ignoring the rare responses)? And, what are the normative orientations of the receivers responding or - usually - not responding to the literature? Are there perhaps orientations completely different from those that are suggested by our theories? A convincing answer, I presume, cannot been given as long as we conceptualize the whole connexion as a system only dedicated to one cognitve goal, i.e. informal communication. Instead, we have to admit that there is a complex, multi-functional system consisting of cognitive as well as of social functions, tasks, normative orientations etc.Includes: Conference preprint, Pratt student commentaryXAInternationa
- …
