3,986 research outputs found
Collaboration in Iranian Scientific Publications
No full textThis study looks at international collaboration in Iranian scientific publications through the ISI Science Citation Index® (SCI) for the years 1995-1999, inclusive. These results are compared to and contrasted with the earlier findings for the periods covering 1985-1994 (Osareh & Wilson 2000). The results of Iran's increasing productivity over a 15-year period are presented. Iran doubled its output in the first two five-year periods and increased 2.8-fold from the second to the third five-year period. The rise in Iran's scientific publication output is due mainly to factors such as the ending of the war, better economic conditions, recent changes in the Iranian government's policy, basic changes in the political environment brought about by the Reformers, expansion of the Iranian presses for national publications, and the recent return of a large number of students trained overseas through government scholarships. External changes also account for the increased productivity, e.g., the acceptance of three Iranian source journals by the SCI, increased access to international databases through the Internet and better electronic communication facilities for international collaboration. One of the most important and significant factors that caused this dramatic rise seems to be the government's research policies in the last few years. Since 1999, the Iran Science, Research and Technology Ministry, has encouraged researchers to publish their non-Farsi language articles in highly ranked international scientific journals, for example, by giving prizes to researchers who publish their articles in ISI-ranked journals
Wilson Dam
No full textBlack and white photographic view of the Wilson Dam in Florence, AL. The view is taken from the power house end of the dam. Power house being the structure sitting on the water right of the dam. Dam consist of long cement wall with numerous arch-shaped doors or locks that open and close. Radio antenna, housetops and trees can be seen in the background. Divided back postcard.Printed on front: 'Wilson Dam, Florence, Alabama.' ; Printed on back: 'P.S. We are seeing all the sights traveling with a Conoco Touraide. It's wonderful! Your Mileage Merchant at his Conoco Station will tell you how to get one.'Written on back: 'June 1949
Mt. Borah
No full textA mountain rises above some wooded foothills. Description reads: ""Telephoto view of Mt. Borah (12,655 ft. elevation) highest mountain in Idaho, taken from Grazing Service CCC Camp Chilly #111. Forest: Challis, State: Idaho, Date: 7/1940, Author: P.S. Bieler""
A Comment On Bonnor-steadman Closed Timelike Curves
No full textThe existence and stability closed timelike curves in a Bonnor-Ward spacetime without torsion line singularities is shown by exhibiting particular examples. © 2008 Springer Science+Business Media, LLC.413571573Bonnor, W.B., Steadman, B.R., (2005) Gen. Relativ. Gravit., 37, p. 1833Bonnor, W.B., Ward, J.P., (1972) Commun. Math. Phys., 28, p. 323Rosa, V.M., Letelier, P.S., (2007) Phys. Lett. A, 370, p. 99Letelier, P.S., Oliveira, S.R., (1998) Phys. Lett. A, 238, p. 101Letelier, P.S., (1995) Class. Quantum. Gravit., 12, p. 471Perjés, Z., (1971) Phys. Rev. Lett., 27, p. 1668Israel, W., Wilson, G.A., (1972) J. Math. Phys., 13, p. 32
Hyndman Peak
No full textA mountain is visible across a valley and between two hills. Description reads: ""Hyndman Peak (12,078 ft. elevation) as seen from upper Big Lost River near Kane Creek on Forest Road to Ketchum. Forest: Challis, State: Idaho, Date: 7/1940, Author: P.S. Bieler""
SSIMS Molecular Selective Imaging: a new diagnostic tool to investigate metal passivators in scrapped transformers
No full textIn every high voltage grid, the replacement of assets is a slow but steady process that guarantees long-term reliability of the power distribution networks. The prioritisation of such interventions is based on complex rating criteria specifically designed to highlight potential issues of certain machines (or families of machines) in need of care. Given the tremendous costs of operations such as the replacement of a power transformer it is not surprising to observe constant efforts devoted to finding new and better monitoring and diagnostic tools. These are capable of delivering invaluable information about the conditions of a transformer, in service or after it is either failed or proactively scrapped, allowing a better comprehension of underlying chemical-physical phenomena occurring. Ideally, advanced monitoring and diagnostic tools should ultimately result in improved rating parameters to be applied in the evaluation of future interventions. This feasibility study evaluates the use of static secondary ion mass spectrometry (SSIMS) molecular selective imaging as a diagnostic tool for power transformer. SSIMS is herein demonstrated to be able to assess, without doubts, the presence and integrity of the passivation layer produced by Irgamet®39 on copper surfaces in laboratory tests. The technique has also been tested on real samples collected from one of the phases of a 400/275kV autotransformer proactively scrapped and proved to be applicable without significant sample preparation. The possibility of its use in the study of the distribution of Irgamet®39 across the windings is also demonstrated. Further development of SSIMS as a diagnostic tool would be significantly increasing the grade of detail at which scrapped/failed units could be inspected. A better understanding on how the operating conditions or the design of a transformer can affect the anticorrosion protection layer at the molecular level would open the way to significant ad hoc improvements of both operative guidelines and rating criteria for power transformers
Subspecies and Distribution. P.s. sericeus Thomas, 1907 — E New Guinea Central Range (E of 143°E). P s. occidentalis Menzies & Pernetta, 1986 — W New Guinea Central Range (W of 143°E). An additional isolated population was recently documented on the outlying volcanic peak of Mt Bosavi in SC Papua New Guinea. in Phalangeridae
No full textSubspecies and Distribution. P.s. sericeus Thomas, 1907 — E New Guinea Central Range (E of 143°E). P s. occidentalis Menzies & Pernetta, 1986 — W New Guinea Central Range (W of 143°E). An additional isolated population was recently documented on the outlying volcanic peak of Mt Bosavi in SC Papua New Guinea.Published as part of Russell A. Mittermeier & Don E. Wilson, 2015, Phalangeridae, pp. 456-497 in Handbook of the Mammals of the World – Volume 5 Monotremes and Marsupials, Barcelona :Lynx Edicions on page 492, DOI: 10.5281/zenodo.665741
Impulse scattering from clouds of acoustically coupled gas bubbles in fluids
No full textTo calculate the impulse response of a bubble cloud in a compressible medium, a methodology is developed that incorporates multiple scattering effects between bubbles and coherent interactions of their individual scattered fields. This method is based on a perturbation theory, and provides for an approximate solution formulated by adding a perturbation to the mathematical description of a linear problem. The solution is defined as a power series, where the first term of the expansion corresponds to the solution of a linear uncoupled equation. The convergence of the expansion is determined by the parameters of the physical bubbles and the acoustic interactions. The model is successfully applied to describe experimental measurements of a model bubble cloud response in a shallow freshwater environment
Relevance theory and the semantics of non-declarative sentences
No full textWilson and Sperber (1988a; Sperber and Wilson 1986) have proposed semantic
analyses of declaratives, imperatives and interrogatives which are based on the notion
of 'a direct semantic link between linguistic form and representations of propositional
attitude'. They claim, however, that the various syntactic structures encode 'procedural'
rather than 'conceptual' information. Rather than encoding concepts which appear in
representations of propositional attitude (or what Sperber and Wilson call 'higher-level
explicatures') they convey information about how to proceed in recovering such
representations.
This thesis is an attempt to extend this analysis to some constructions which have
not been explicitly discussed by Wilson and Sperber, to consider the differences between
this approach and some alternatives, and to question the status of the notion of a
'sentence type', which has often been assumed in analysing the various syntactic
structures. Some evidence is provided that certain lexical items also encode procedural
information about propositional attitudes, and the role of intonation in utterance-interpretation
is also discussed.
This analysis is based on relevance-theoretic assumptions about semantics and
pragmatics. Chapter one presents the general approach to semantics assumed by
relevance theory and shows how Wilson and Sperber's proposal fits into this framework.
Chapter two is concerned with the proposed semantic analysis of imperatives.
This analysis is extended to some 'pseudo-imperatives': forms consisting of the
conjunction or disjunction of an imperative and a declarative clause, which have often been treated as conditionals. An analysis of imperative-like constructions containing 'let'
or 'let's' is also proposed. This analysis can be extended to related forms containing 'may'.
Chapter three is concerned with the semantic analyses of interrogatives and
exciamatives proposed by Wilson and Sperber. This approach is extended to some
constructions which seem to resemble interrogatives in some ways and exciamatives in
others. The relationship between grammar and intonation is also discussed. Tonal
structure can also be seen as encoding procedural information.
Chapter four contrasts this approach with alternatives which treat illocutionary
force or mood as semantic categories. Wilson and Sperber's approach is more successful
than the alternatives and suggests reasons for their inadequacy. A straightforward
account of the relationship between form and force, and the interpretation of utterances
which have been said to perform 'indirect speech acts', follows from Wilson and
Sperber's proposal
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