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Search Results: 1 - 10 of 433837 matches for " J.D.;Fagundes "
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Propagadores cuánticos calculados de acuerdo con el postulado de Feynman con caminos aproximados por polinomios
Bulnes, J.D.;
Revista mexicana de física E , 2009,
Abstract: in this paper we calculate in detail the quantum mechanical propagator for two physical systems, a two-dimensional free particle and a particle in the earth's gravitational field, according to feynman sum-over-paths postulate. the method of propagator calculation that we have used is based on an approximation by polynomials, which is consistent with weierstrass theorem. the results obtained with this method, except for a numerical factor that depend only on the degree of the polynomials, are equal to those obtained through the use of formal methods.
Review: W.F. Botha (Hoofredakteur): Woordeboek van die Afrikaanse Taal, 750 Dertiende Deel: R.
J.D McLachlan
Lexikos , 2010,
Abstract: W.F. Botha (Hoofredakteur). Woordeboek van die Afrikaanse Taal, Dertiende Deel: R. 2009, xxi + 541 pp. ISBN-13: 978-0-9584971-7-6 (plastiekband), ISBN-13: 978-0-9584971-8-3 (leerband). Stellenbosch: Buro van die WAT. Prys: R290 (plastiekband) / R590 (leerband).
Why chemistry is worth studying
J.D. Smith
Bulletin of the Chemical Society of Ethiopia , 1989,
Abstract: Bull. Chem. Soc. Ethiop., 3(1), 61-67 (1989).
J.D. Amirkhanian
Iranian Journal of Public Health , 1974,
Abstract: The polygene chromosomal pattern together with the somatic and meiotic chromosomes of the autogenous Tehran strain of Culex pipiens molestus is described. The first and third chromosomes are metacentric, the second one is slightly submetacentric. Each chromosome has well-defined, large puffed char-acteristic centromeres. Randomly distributed asynaptic regions on the polytens chromosomes are indicative of gene differences, on homologous arms which occasionally involve the centromeres. Puffs are sometimes noticeable on the chromosomal arms. A permanent puff is located on the first and third chromosome. The morphology of the first meiotic metaphase chromosomes is characteristic of the species. The existence of interchromosomal and intrachromosomal connective, and also stickiness of the ends of the salivary chromosomes to one another, is the major difficulty in the preparation of the salivary gland chromosomes of Culex, which has been overcome by the technique for the mosquito chromosome spreads.
Cambio climático y patrones de precipitación: efecto sobre las comunidades vegetales semiáridas
J.D. Miranda
Ecosistemas , 2008,
A review of ecological interactions between crayfish and fish, indigenous and introduced Interactions écologiques entre les écrevisses et les poissons, indigènes et introduits
Reynolds J.D.
Knowledge and Management of Aquatic Ecosystems , 2011, DOI: 10.1051/kmae/2011024
Abstract: Crayfish (decapods) and fish are both long-lived large members of freshwater communities, often functioning as keystone species. This paper reviews interactions between these, with emphasis on the European context. Native crayfish and fish are in ecological balance, which may involve mutual predation, competition and sometimes habitat disturbance. This balance is disrupted by range extensions and translocations of native fish or crayfish into exotic situations. Some fish and crayfish have been translocated globally, chiefly from North America to other continents. Non-indigenous crayfish species (NICS) may impact on native fish, just as introduced fish impact on indigenous crayfish species (ICS). Competition between ICS and NICS may result in making the former susceptible to various mechanisms of interaction with fish, indigenous or introduced. In Europe, long-established NICS – signals, spiny-cheek and red swamp crayfish – may occur in greater densities than ICS; they are more tolerant and aggressive and show more interactions with fish. More recent introductions, still restricted in distribution, have not yet received enough study for their impacts to be assessed. Interactions between fish and crayfish in North and South America, Madagascar and Australasia are also explored. Mechanisms of interaction between fish and crayfish include mutual predation, competition for food and spatial resources, food-web alteration and habitat modification. Resultant changes in communities and ecosystems may be physical or biotal, and affect both ecosystem services and exploitation potential. Les écrevisses (décapodes) et les poissons appartiennent aux grandes communautés d’eau douce à longue durée de vie et fonctionnent souvent comme des espèces clés. Cet article synthétise la littérature sur les interactions entre poissons et écrevisses, en mettant l’accent sur le contexte européen. Les écrevisses et les poissons autochtones sont en équilibre écologique, ce qui peut impliquer la prédation mutuelle, la compétition et parfois la perturbation des habitats. Cet équilibre est perturbé par l’extension de leur distribution et les transferts de poissons indigènes ou d’écrevisses dans des situations exotiques. Certains poissons et écrevisses ont été transférés au niveau mondial, principalement de l’Amérique du Nord vers d’autres continents. Les espèces d’écrevisses non indigènes (NICS) peuvent avoir un impact sur les poissons indigènes, et inversement les poissons non indigènes sur les espèces d’écrevisses indigènes (ICS). La concurrence entre ICS et NICS peut se traduire par l
H.F. Verwoerd’s student years - cradle of his political career and thought
J.D. Froneman
Koers : Bulletin for Christian Scholarship , 2000, DOI: 10.4102/koers.v65i3.482
Abstract: This article briefly describes student life in Stellenbosch during the period 1919-1924 when the young H.F. Verwoerd was immersed in a general Christian ethos and atmosphere of Afrikaner nationalism which he articulated with fervour. In view thereof, the notion put forward by Miller (1993), viz. that South Africa’s sixth prime minister changed his political beliefs substantially when he became the editor of Die Transvaler in 1937 is rejected. It is found that the basic views Verwoerd held as a student were generally consistent with those he held in later life. It is accepted, though, that some of his views were adapted and inconsistencies could possibly be identified in some of his views. Unlike Miller’s analysis and conclusions, Venter’s (1999) analysis of Verwoerd's political thought is found to be remarkably consistent with the views and activities of Verwoerd the student activist. Consequently, this article argues that the context and nature of the political views he held as a student at Stellenbosch help significantly to explain Verwoerd’s later positions as lecturer, editor and politician, even if he did not personally subscribe to every view expressed by the Students' Representative Council he was part of and chaired.
Iban augury
J.D. Freedman
Bijdragen tot de Taal-, Land- en Volkenkunde , 1961,
De houding van de hindostaanse bevolkingsgroep in Suriname ten opzichte van de Creolen
J.D. Speckmann
Bijdragen tot de Taal-, Land- en Volkenkunde , 1963,
Towards a Christian model for journalism
J.D. Froneman
Koers : Bulletin for Christian Scholarship , 1997, DOI: 10.4102/koers.v62i1.551
Abstract: While it is necessary to question the underlying presuppositions of the news media, it is not adequate merely to criticize or reject non-Christian models. However, little has been done to formulate a comprehensive Christian model for the media in general, or journalism in particular. In this article some outlines of a Christian model for journalism are suggested. It includes three basic principles as well as several sub-principles (or norms). It is argued that the suggested norms could be regarded as "news values". The general use of the term "news values” is thus rejected in order to protect the normative character of values. It is stressed that as journalism is not an "objective", value-free activity, all aspects o f the ongoing selection process instrinsic to journalism ought to acquire a Christian flavour.
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