OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Osvaldo;” ,找到相关结果约1995条。
The Precise Determination of Mass through the Oscillations of a Very High-Q Electromechanical System  [PDF]
Osvaldo F. Schilling
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.53015

The present paper is based upon the fact that if an object is part of a highly stable oscillating system, it is possible to obtain an extremely precise measure for its mass in terms of the energy trapped in the system, rather than through a ratio between force and acceleration, provided such trapped energy can be properly measured. The subject is timely since there is great interest in Metrology on the establishment of a new electronic standard for the kilogram. Our contribution to such effort includes both the proposal of an alternative definition for mass, as well as the description of a realistic experimental system in which this new definition might actually be applied. The setup consists of an oscillating type-II superconducting loop subjected to the gravity and magnetic fields. The system is shown to be able to reach a dynamic equilibrium by trapping energy up to the point it levitates against the surrounding magnetic and gravitational fields, behaving as an extremely high-Q spring-load system. The proposed energy-mass equation applied to the electromechanical oscillating system eventually produces a new experimental relation between mass and the Planck constant.

A Phenomenological Model for the Electromagnetic Origin of Mass in Particles, and Its Quantitative Application to the Electron, the Muon, the Proton, and the Neutron  [PDF]
Osvaldo F. Schilling
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.49161

A simple phenomenological model is developed, which indicates the existence of a direct link between the concept of rest mass of a particle and magnetodynamic energies associated to the formation of the particle. The model is based upon the principles of quantization and conservation of flux, well known for their application in superconductivity. The charge of particles is considered as forming vortices of superconducting currents, which we postulate are created by electromagnetic fluctuations from vacuum (or related processes). A new quantization rule gathers the size, the magnetic moment, and the rest mass of the particle and associates these quantities to the integer number of flux quanta that should be stored in the vortices corresponding to each particle. The model is applied to the electron, the muon, the proton, and the neutron. Quantitative consistency with available experimental data for these subatomic particles is obtained.

Approximation Method for the Relaxed Covariant Form of the Gravitational Field Equations for Particles  [PDF]
Emanuel Gallo, Osvaldo M. Moreschi
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329161
Abstract: We present a study of the so called relaxed field equations of general relativity in terms of a decomposition of the metric; which is designed to deal with the notion of particles. Several known results are generalized to a coordinate free covariant discussion. We apply our techniques to the study of a particle up to second order.
Utopía social y utopía tecnológica en el pensamiento de las izquierdas argentinas para la transformación del capitalismo agrario, 1890-1945
Mundo agrario , 2010,
Abstract: the objectives of this work are to rebuild the communist and socialist thinking and the political proposals used, between 1890 and 1945, to set a new model of economics and society within the agrarian sector in the pampas region, and which, on its basis, include elements of social and technological utopias. along the first half of the twentieth century, the left wings developed several projects aimed to transform the agrarian economics and society in argentina and thus, tried to influence the modifications of social and economics rural relations dominant in the country, and in particular in the pampas region. those proposals started to throw the imaginary of a rural world different to the current upon the speech and the political thinking of the left wings. in many of them shaped as a social utopia and in others shaped as a technological utopia, for its realization.
Perspectivas eticas para a educa?ao: uma reflex?o seus pressupostos humanisticos
Educere , 2007,
Abstract: este es resultado de una investigación bibliográfica, cuyos temas esenciales son la ética y la educación. se enfatiza que el sujeto humano aprehende la realidad, más específicamente, asimila de forma biológica y racional. a través de este procedimiento elabora el lenguaje que le permite expresarse. en la educación se produce una introyección del lenguaje. sus valores son clasificados por weil (1993) como lenguaje común, metafísica, moral, lógica, estética y psicología. simultáneamente se produce la socialización del hombre. la concepción de hombre anunciada por la iglesia den puebla de los ángeles, en 1979, se distingue por sus categorías: visión determinista, visión psicologista, visión economicista, visión individualista, visión colectivista, visión estatista y visión cientificista. a partir de estas inferencias se puede concluir que el hombre en el proceso de ense?anza-aprendizaje es conducido a despertar el sentido de ser y no el de tener, se valorizan las experiencias de los estudiantes, se incluye la interacción y reflexión en todos los aspectos sensibilizándolo para el espíritu ético. por lo tanto, es posible la humanización del hombre en el proceso de ense?anza aprendizaje
Propuesta metodológica para el análisis descriptivo de vidrios "retocados" del noroeste de la provincia de Mendoza
La zaranda de ideas , 2010,
Abstract: we present a methodological proposal for the descriptive analysis of glass materials that present retouched and / or reuse features. this proposal arises due to the few regional precedents of the topic and the need to systematize the criteria for the analytical description of the glassy record of the northwest of mendoza. the goal of this paper is the development of criteria to the knowledge of the reuse patterns, production and use of cutting-scraping instruments by human groups of northwestern mendoza.
Identifica??o colorimétrica em citrus
Bacchi, Osvaldo;
Bragantia , 1943, DOI: 10.1590/S0006-87051943000700003
Abstract: in order to study the susceptibility of the various stocks with regard to the new disease "tristeza" ("sadness"), a quick and acurate identification of the stock is required. in orchards this cannot be done in most cases as stocks do not always exhibit sprouts and on account of erroneus information frequently given by owners. we have tested the colorimetric identification, already employed in other countries. this identification is based on the differences of color obtained in the watery extract cf the bark taken from the trunk or from the root, when treated by special reagents. the results obtained are somewhat different from those described by the authors of the method. this is perhaps due to variation in environmental conditions. only the almen and ferric chloride tests gave satisfactory results, making it possible to arrange the species and varieties examined into four groups : (1) c. aurantium l. ; (2) c. sinensis osbeck; (3) c. limonia osbeck ("gigante" variety) and (4) all the others. although deficient in certain respects the test is valuable, permiting us to identify the stocks of orange trees, azeda as well as caipira the most employed in the citrus orchards of the state of s. paulo.
Observa??es citolúgicas em Citrus: VI. Resultados preliminares do efeito da colchicina s?bre sementes em germina??o
Bacchi, Osvaldo;
Bragantia , 1944, DOI: 10.1590/S0006-87051944000600002
Abstract: attention is drawn to the economic importance of triploidy in citrus. during his investigations, the author only found one tetraploid (2n = 36) and one pentaploid (2n = 45) as natural polyploids in citrus. preliminary results are then presented of an experiment to produce polyploids through the treatment of seeds with colchicine. germination was not influenced by these treatments. chromosome counts in root tips and the mensurement of stomata area gave the following results : 1) three of the examined plants (c.3, c.9 and c.15) had diploid and tetraploid roots and a tetraploid epidermis, to judge from its stomata area. 2) another plant, c.12, besides being an hyperdiploid (2n=19 and 20?), had one root which was a chimera, as in one of its cells approximated 38 chromosomes were counted; in spite of this chromosomal alteration, the epidermis of its leaves were of normal size, as in diploids.
Observa??es citológicas em citrus: lll. megasporogênese, fertiliza??o e poliembrionia
Bacchi, Osvaldo;
Bragantia , 1944, DOI: 10.1590/S0006-87051944000200002
Abstract: 1. a general review is presented of megasporogenesis, fertilization, endosperm formation and polyembryony in citrus, most of the findings of strassburger (10) and osawa (6) having been confirmed through investigation of c. parodisi macf. and c. aurantium l. 2. a new form of polyembryony is presented, caused by the existence in some instances of two gametophytes in the same ovule. the origin of two non-identical hybrids from the same seed is thus explained. 3. three forms of polyembryony are therefore known in citrus, (a) nucellar embryony, giving rise to a variable number of identical, "maternal" seedlings derived from the nucellus ; (b) cleavage polyembryony (4, 5) originating through fission of the generative embryo; and (c) polyembryony caused by the occurrence of more than one normal gametophyte in the same ovule. the endosperm in citrus is free.
De brava a dura: La policía de la provincia de Buenos Aires durante la primera mitad del siglo XX
Cuadernos de antropolog?-a social , 2010,
Abstract: this article analyzes the institutional transformation of the provincial police of buenos aires during the first half of the twentieth century. first, the period from the 1880s when both city and provincial police were separated up to the 1920s is studied. then, the institutional evolution of this law enforcement agency is divided in three stages: 1) the 1930s when significant changes began to taking place, 2) the military coup of 1943 and the following peronist period, when a deep administrative police reform happened. and 3) the years of the revolución libertadora from 1955 on, analyzed in this article as a conclusion. the entire piece refers to the transition from a brava (1930s) to a dura (1960s) police agency that issued its own institutional goals in concurrence with the political and military governments during those decades.

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