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Search Results: 1 - 10 of 15252 matches for " Ksh. Newton Singh "
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Anisotropic Charged Fluid Sphere in Isotropic Coordinates
Neeraj Pant,N. Pradhan,Ksh. Newton Singh
Journal of Gravity , 2014, DOI: 10.1155/2014/380320
Abstract: We have presented a class of charged superdense star models, starting with a static spherically symmetric metric in isotropic coordinates for anisotropic fluid by considering Hajj-Boutros-(1986) type metric potential and a specific choice of electrical intensity E and anisotropy factor which involve charge parameter K and anisotropy parameter . The solution is well behaved for all the values of Schwarzschild compactness parameter u lying in the range , for all values of charge parameter K lying in the range , and for all values of anisotropy parameter lying in the range . With the increase in , the values of K and u decrease. Further, we have constructed a superdense star model with all degree of suitability. The solution so obtained is utilized to construct the models for superdense star like neutron stars and strange quark stars . For and , the maximum mass of neutron star is observed as and radius . Further for strange quark stars and are obtained. 1. Introduction Since the formulation of Einstein-Maxwell field equations, the relativists have been proposing different models of immensely gravitating astrophysical objects by considering the distinct nature of matter or radiation (energy-momentum tensor) present in them. Einstein-Maxwell field equations with anisotropic matter in isotropic coordinates have more importance over Einstein field equations for perfect fluid in curvature coordinates due to following rationale justifications.(i)The presence of some charge may avert the catastrophic gravitational collapse by counterbalancing the gravitational attraction by the electric repulsion in addition to the pressure gradient.(ii)The inclusion of charge inhibits the growth of space time curvature which has a great role in avoiding singularities (Ivanov [1]; de Felice et al. [2]).(iii)Bonnor [3] pointed out that a dust distribution of arbitrarily large mass and small radius can remain in equilibrium against the pull of gravity by a repulsive force produced by a small amount of charge.(iv)The solutions of Einstein-Maxwell equations are useful to study the cosmic matter.(v)The charge dust models and electromagnetic mass models are providing some clue about the structure of electron (Bijalwan [4]) and Lepton model (Kiess [5]).(vi)Several solutions which do not satisfy some or all the conditions for well-behaved nature can be renewed into well-behaved nature by charging them.(vii)Maharaj-Takisa [6] pointed out that the astrophysical objects have essential characteristics of rotational motion, which is caused by the presence of anisotropic parameter. Therefore,
Modeling anisotropic charged neutron star in isotropic coordinates
Ksh. Newton Singh,Narendra Pradhan,Manuel Malaver
Physics , 2015,
Abstract: We present a spherically symmetric solution of the general relativistic field equations in isotropic coordinates for charged fluid with pressure anisotropy, compatible with a super dense star modeling. Further, we have constructed an anisotropic model of super dense star with all degree of suitability. We also observed that by increasing anisotropy, the maximum mass of super dense stars also decreases.
Simulating Site-Specific Effects of a Changing Climate on Jack Pine Productivity Using a Modified Variant of the CROPLANNER Model  [PDF]
Peter F. Newton
Open Journal of Forestry (OJF) , 2012, DOI: 10.4236/ojf.2012.21004
Abstract: This study evaluated the site-specific effects of projected future climate conditions on the productivity of jack pine (Pinus banksiana Lamb.) plantations over the next 50 years (2011-2061). Climatic parameters as predicted by the Canadian Global Climate Model in association with a regional spatial climatic model, under 3 emissions scenarios (no change (NC), B1 and A2), were used as input values to a biophysical-based site-specific height-age model that was integrated into the CROPLANNER model and associated algorithm. Plantations managed under a basic silvicultural intensity on two site qualities at each of two geographically separated sites (northeastern and northwestern Ontario, Canada) were assessed. The results indicated that the stands situated on low-to-medium quality sites at both locations were largely unaffected by the predicted increase in temperature and precipitation rates. Conversely, however, stands situated on good-to-excellent quality sites grown under the B1 and A2 scenarios experienced consequential declines in stand development rates resulting in decreases in rotational mean sizes, biomass yields, recoverable end-product volumes, and economic worth. In addition to providing a plausible range of site-specific climate change outcomes on jack pine productivity within the central portion of the species range, these results suggest that future predictions that do not account for potential climate changes effects may overes- timate merchantable productivity on the higher site qualities by approximately 15%. As demonstrated, in- corporating biophysical-based site index functions within existing forest productivity models may repre- sent a feasible approach when accounting for climate change effects on yield outcomes of boreal species.
Genetic Worth Effect Models for Boreal Conifers and Their Utility When Integrated into Density Management Decision-Support Systems  [PDF]
Peter F. Newton
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.51011
Abstract: Based on approaches deduced from previous research findings and empirical observations from density control experiments, genetic worth effect response models were developed for black spruce (Picea mariana (Mill) BSP.) and jack pine (Pinus banksiana Lamb.) plantations. The models accounted for the increased rate of stand development arising from the planting of genetically-improved stock through temporal adjustments to the species-specific site-based mean dominant height-age functions. The models utilized a relative height growth modifier based on known estimates of genetic gain. The models also incorporated a phenotypic juvenile age-mature age correlation function in order to account for the intrinsic temporal decline in the magnitude of genetic worth effects throughout the rotation. Integrating the functions into algorithmic variants of structural stand density management models produced stand development patterns that were consistent with axioms of even-aged stand dynamics.
Quantifying Growth Responses of Black Spruce and Jack Pine to Thinning within the Context of Density Management Decision-Support Systems  [PDF]
Peter F. Newton
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.54035
Abstract: Models for quantifying the growth responses of black spruce (Picea mariana (Mill) BSP.) and jack pine (Pinus banksiana Lamb.) to precommercial thinning (PCT) treatments were developed. They accounted for the increased rate of stand development arising from PCT treatments through temporal adjustments to the species and site specific mean dominant height-age functions. Analytically, they utilized a relative height growth modifier consistent with observed density-dependent height repression effects. A phenotypic juvenile age-mature age correlation function was used to account for the intrinsic temporal decline in the magnitude of the PCT effect throughout the rotation. The resultant stand development patterns were in accord with theoretical and empirical expectations when the response models were integrated into algorithmic variants of structural stand density management models.
Das barricadas à vida privada
Bignotto, Newton;
Nova Economia , 2006, DOI: 10.1590/S0103-63512006000300004
Abstract: this article examines the issue of present-day participation and political action in light of the concepts that originated with the republican tradition. our main concern is how the boundaries that separate the public world from the private world are drawn in contemporary societies. two problems deserve special attention: the issue of apathy and loneliness of citizens who live in peripheral democratic societies, and the excesses committed by those who adopt the model of action derived from revolutionary jacobinism.
Conhecimento tácito e conhecimento escolar na forma??o do professor (por que Donald Sch?n n?o entendeu Luria)
Duarte, Newton;
Educa??o & Sociedade , 2003, DOI: 10.1590/S0101-73302003000200015
Abstract: this paper defends that donald sch?n's works on professional education in general and more particularly on teachers' education are based both on an epistemology that devalues scientific knowledge and on a pedagogy that devalues school knowledge. a critical analysis of sch?n's concepts of tacit knowledge (or reflection-in-action) and school knowledge is presented. this critical analysis is inserted in the context of a criticism of the currently hegemonic epistemological ideas in the field of studies on teachers' education.
A anatomia do homem é a chave da anatomia do macaco: a dialética em Vigotski e em Marx e a quest?o do saber objetivo na educa??o escolar
Duarte, Newton;
Educa??o & Sociedade , 2000, DOI: 10.1590/S0101-73302000000200004
Abstract: vygotsky, in his manuscript concrete human psychology, asserts that the relationship ontogeny-philogeny in cultural development is different from the same relationship in organic development: the human fetus develops itself without an interection with a mature biotype, whereas in cultural development this interaction is the most important force for all development. thus, this article analysis the relationship between the dialectics present in vygotsky and in marx, substantiated in methodological and epistemological reflexion done by marx on the text whereby he asserts that "the human anatomy is the key for monkey anatomy". the conclusion of this article defends that vygotsky's psychology supports a pedagogy which one appreciates the conduction of children to learn the highest objective knowledge produce by all mankind.
A contradi??o entre universalidade da cultura humana e o esvaziamento das rela??es sociais: por uma educa??o que supere a falsa escolha entre etnocentrismo ou relativismo cultural
Duarte, Newton;
Educa??o e Pesquisa , 2006, DOI: 10.1590/S1517-97022006000300012
Abstract: the thesis of the end of the meta-narratives defended by postmodernism implies the negation of the universality of culture. it is not just the fact that human culture has not yet achieved true universality, and not even the fact that the ruling classes have so far subjected human culture to their own private interests and, to that end, have suffocated and destroyed much of the wealth contained in local cultures. to postmodernism the problem does not reside in the bourgeois vision of human culture, but in the very idea that a universal culture can exist. postmodernists declare that any educational project based on the idea of the existence or possibility of a universal culture is a conservative, authoritarian, ethnocentric project. this text argues for the thesis that the marxian conception of the historic process of constitution of the universal human wealth incorporates the theoretical elements necessary to overcome the false option, postulated by the various postmodernist trends, between ethnocentrism and cultural relativism. in marx, the universalization of human culture in the capitalist society takes place through the universalization of the exchange value of the goods as the fundamental mediation of social relations. it is, therefore, a dialectical process in which the humanization and the alienation of the human genre and of the individuals occur at the same time. the text concludes with the presentation of the challenges that, based on this marxian conception of universal wealth, must be faced in the process of constructing a marxist pedagogy.
Soberania e exce??o no pensamento de Carl Schmitt
Bignotto, Newton;
Kriterion: Revista de Filosofia , 2008, DOI: 10.1590/S0100-512X2008000200007
Abstract: the article tries to demonstrate that in carl schmitt's thought, there is a fusion between the concept of ancient legislator and that of modern sovereign. the result is that the concept of exception became nuclear to the political life.
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