31,859 research outputs found
Beyond Cultural Aphasia.
No full textA Conversation between Rossella Ciocca and the scholar and cultural activist G. N. Devy, author of the People's Linguistic Survey of India, about nomadic communities and their endangered languages and cultures
The universal rank-(n-1) bundle on G(1, n) restricted to subvarieties
No full textThe author has, in several articles, studied varieties in the Grassmannian G(k, n) of kplanes in projective n-space, that are projections from a variety in G(k,N). In the case k = 1 the varieties of dimension n−1 in G(1, n) that are projections from G(1,N) were studied by E. Arrondo and I. Sols [“On congruences of lines in the projective space”,
M´em. Soc. Math. Fr., Nouv. S´er. 50 (1992; Zbl 0804.14016)] and solved for n = 3 by E. Arrondo [J. Algebr. Geom. 8, No. 1, 85-101 (1999; Zbl 0945.14030)]. In the paper under review the author studies the other extreme k = n−1, n−2. The case k = n−1 is solved completely, and in the case k = n−2 it is shown that if Y is a smooth variety of dimension s in G(1, n) whose dual Y in G(n − 2, n) is a non-trivial projection from G(n − 2, n + 1), then s = n − 1 and Y is completely classified. The methods are from classical projective geometry and based upon results by E. Rogora [Manuscr. Math. 82, No. 2, 207-226 (1994; Zbl 0812.14038)] and B. Segre.DGICYTDepto. de Álgebra, Geometría y TopologíaFac. de Ciencias MatemáticasFALSEpu
Experimental investigation into the effect of substrate clamping on the piezoelectric behaviour of thick-film PZT elements
No full textThis paper details an experimental investigation of the clamping effect associated with thick-film piezoelectric elements printed on a substrate. The clamping effect reduces the measured piezoelectric coefficient, d33, of the film. This reduction is due to the influence of the d31 component in the film when a deformation of the structure occurs, by either the direct or indirect piezoelectric effect. Theoretical analysis shows a reduction in the measured d33 of 62%, i.e. a standard bulk lead zirconate titanate (PZT)-5H sample with a manufacturer specified d33 of 593pC/N would fall to 227.8pC/N. To confirm this effect, the d33 coefficients of five thin bulk PZT-5H samples of 220µm thickness were measured before and after their attachment to a metallized 96% alumina substrate. The experimental results show a reduction in d33 of 74% from 529pC/N to 139pC/N. The theoretical analysis was then applied to existing University of Southampton thick-film devices. It is estimated that the measured d33 value of 131pC/N of the thick-film devices is the equivalent of an unconstrained d33 of 345pC/N
Liquid dynamic medicine and N-of-1 clinical trials: A change of perspective in oncology research
No full textThe increasing use of genomics to define the pattern of actionable mutations and to test and validate new therapies for individual cancer patients, and the growing application of liquid biopsy to dynamically track tumor evolution and to adapt molecularly targeted therapy according to the emergence of tumor clonal variants is shaping modern medical oncology., In order to better describe this new therapeutic paradigm we propose the term "Liquid dynamic medicine" in the place of "Personalized or Precision medicine". Clinical validation of the "Liquid dynamic medicine" approach is best captured by N-of-1 trials where each patient acts as tester and control of truly personalized therapies. © 2017 The Author(s)
A study on the reliability of consecutive k-Out-of-n: G systems based on Copula
No full textThe computation of reliability characteristics of a system that consists of dependent components is sometimes difficult especially when the type of dependence is not known. This article introduces the copula method to calculate the reliability of dependent consecutive k-out-of-n: G systems. The components in these systems are dependent on each other and the dependency may be either linear or nonlinear. The copula is a popular tool for modeling the dependence structure of data. It contains the information about the dependency structure of a vector of random variables and can capture nonlinear dependence. Based on the copula theory, the article analyzes the consecutive k-out-of-n: G systems and gets the reliability indexes. Finally, some numerical examples are presented to illustrate the results obtained in this article.Peer reviewe
Screening and Ranking of Chad Basin for co 2 Sequestration Potential in Nigeria
No full textABSTRACT Sedimentary basins are suitable to different degrees for CO 2 geological sequestration as a result of various intrinsic and extrinsic characteristics. This paper preliminarily screened and ranked the Chad Basin of Nigeria sector based on Bachu (2003) ranking and screening criteria adapted which includes factors such as tectonic setting, basin size and depth, geology, hydrogeology, hydrocarbon potentials, climate, geothermal, existing resources and industry maturity. For each criterion i (i = 1…5) used for the evaluation of basin suitability, monotonically -increasing numerical function f i is assigned, which are continuous or discrete, to describe a value placed on a specific class j for that criterion. The lowest and the highest functions of this functions characterize the worst and best class in terms of suitability for that criterion, i.e. f i,1 = min (f i ), where and f i,n = max (f i ); where ( n = 3, 4 or 5).The criteria relate to either the containment security, the volume of storage capacity achievable, or considering the economic or technological feasibility. The results shows that Chad basin has R k score value of 0.53 against the f i, n = max (f i ) value equal to 1 as highest value of the function characterize the best in terms of suitability for the criterion in which this ranking are based on. Regional screening and ranking of the entire basins are recommended while detailed local site characterisation of the basin is needed to assess its overall suitability for CO 2 sequestration potentials, since countries like Cameroon, Central African Republic, Niger, Chad, and Nigeria shares the basin on regional leve
The Rei(g)n of ‘Rule’ /
No full textThe Rei(g)n of Rule is a study of rules and their role in language. Rules have dominated the philosophical arena as a fundamental philosophical concept. Little progress, however, has been made in reaching an accepted definition of rules. This fact is not coincidental. The concept of rule is expected to perform various, at times conflicting, tasks. Analyzing key debates and rule related discussions in the philosophy of language I show that typically rules are perceived and defined either as norms or as conventions. As norms, rules perform the evaluative task of distinguishing between correct and incorrect actions. As conventions, rules describe how certain actions are actually undertaken. As normative and conventional requirements do not necessarily coincide, the concept of rule cannot simultaneously accommodate both. The impossibility to consistently define ‘rule’ has gone unnoticed by philosophers, and it is in this sense that ‘rule’ has also blocked philosophical attempts to explain language in terms of rules.The Rei(g)n of Rule is a study of rules and their role in language. Rules have dominated the philosophical arena as a fundamental philosophical concept. Little progress, however, has been made in reaching an accepted definition of rules. This fact is not coincidental. The concept of rule is expected to perform various, at times conflicting, tasks. Analyzing key debates and rule related discussions in the philosophy of language I show that typically rules are perceived and defined either as norms or as conventions. As norms, rules perform the evaluative task of distinguishing between correct and incorrect actions. As conventions, rules describe how certain actions are actually undertaken. As normative and conventional requirements do not necessarily coincide, the concept of rule cannot simultaneously accommodate both. The impossibility to consistently define ‘rule’ has gone unnoticed by philosophers, and it is in this sense that ‘rule’ has also blocked philosophical attempts to explain language in terms of rules.Electronic reproduction.Mode of access: Internet via World Wide Web.Description based on online resource; title from PDF title page (publisher’s Web site, viewed March 24, 2015
Motion of quantum vortex lines near realistic rough boundaries
No full textWe numerically solve the three--dimensional, time--dependent Gross--Pitaevskii equation to model a superfluid flowing over a realistic rough boundary. Our model for the boundary is based on the atom--force microscope image of a NbTi vibrating wire used to generate turbulence in actual experiments. We find that near the boundary a dense region of quantum vortices is created, which forms a kind of `superfluid boundary layer'
An epistle to the author of The four farthing candles: By the author of The Rosciad of C-v-nt-G-rd-n.
No full text12p. ; 4⁰.The author of The Rosciad of C-v-nt-G-rd-n = Charles Churchill.With a half-title.Reproduction of original from the Huntington Library.English Short Title Catalog, ESTCN1512.Electronic data. Farmington Hills, Mich. : Thomson Gale, 2003. Page image (PNG). Digitized image of the microfilm version produced in Woodbridge, CT by Research Publications, 1982-2002 (later known as Primary Source Microfilm, an imprint of the Gale Group)
An introduction to free higher-spin fields (TOPCITE: 130 citazioni su SPIRES HEP)
No full textIn this article we begin by reviewing the (Fang-)Fronsdal construction and the nonlocal
geometric equations with unconstrained gauge fields and parameters built by Francia
and the senior author from the higher-spin curvatures of de Wit and Freedman. We
then turn to the triplet structure of totally symmetric tensors that emerges from free
String Field Theory in the α′ → 0 limit and to its generalization to (A)dS backgrounds,
and conclude with a discussion of a simple local compensator form of the field equations
that displays the unconstrained gauge symmetry of the non-local equations
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