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Search Results: 1 - 10 of 1522 matches for " Brenna Roth "
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A microscopic particle-vibration coupling approach for atomic nuclei. Giant resonance properties and the renormalization of the effective interaction
Marco Brenna
Physics , 2014,
Abstract: The self-consistent mean-field (SCMF) theory describes many properties of the ground state and excited states of the atomic nucleus, such as masses, radii, deformations and giant resonance energies. SCMF models are based on the independent particle picture where nucleons are assumed to move in a self-generated average potential. In the first part of this work, we apply a state-of-the-art SCMF approach, based on the Skyrme effective interaction, to two different excitations (viz. the pygmy dipole resonance and the isovector giant quadrupole resonance), investigating their relation with the nuclear matter symmetry energy, which corresponds to the energy cost for changing protons into neutrons and is a key parameter for the nuclear equation of state. However, SCMF models present well known limitations which require the inclusion of further dynamical correlations, e.g. the ones coming from the interweaving between single-particle and collective degrees of freedom (particle-vibration coupling - PVC). In the second part of this work, we report on the application to inclusive (namely, the strength function of giant resonances) and exclusive (the gamma decay of giant resonances) observables of a new self-consistent model based on the PVC idea in the Skyrme framework. In our model we use an effective interaction fitted at mean-field level to some selected experimental data. In principle, when these interactions are used in beyond mean-field theories, one would need to re-determine the parameters of the interaction at the same level of approximation. Moreover, due to the zero-range nature of the employed interaction, divergences arise. In the last and most innovative part of this thesis, we develop, for the first time in finite nuclei, a possible way to cure the divergences, paving the way to the possibility of producing an effective interaction fitted at PVC level.
Serum Antibody Levels to the Pneumocystis jirovecii Major Surface Glycoprotein in the Diagnosis of P. jirovecii Pneumonia in HIV+ Patients
Kpandja Djawe,Laurence Huang,Kieran R. Daly,Linda Levin,Judy Koch,Alexandra Schwartzman,Serena Fong,Brenna Roth,Anuradha Subramanian,Katherine Grieco,Leah Jarlsberg,Peter D. Walzer
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0014259
Abstract: Pneumocystis jirovecii remains an important cause of fatal pneumonia (Pneumocystis pneumonia or PcP) in HIV+ patients and other immunocompromised hosts. Despite many previous attempts, a clinically useful serologic test for P. jirovecii infection has never been developed.
The Schrödinger Equation of the Hilbert Hyper Space  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.42023
Abstract:

Quantum measurement requires an observer to prepare a specific macroscopic measuring device from various options. In previous papers we redefined this observer role through a new concept: the observer determination, that is, the observers unique selection between the various measurement-devices. Unlike the measurement itself that is rationalized as dictated by nature, we presented the observer determination as a selection that cannot be disputed since it can neither be measured nor proven to be true or false. In general, we suggest that every action or decision made by the observer is eventually an output of some measurement. The apparently contradiction between the observer free determination and the deterministic measurement output was solved by extending the Hilbert space into a Hyper Hilbert space that is a space with hierarchy. In that frame the so called free selection of the observer determination in a certain level turns out to be a deterministic measurement output in the next higher level of the hierarchy. An important role of the conventional Hilbert space is played by the Schr?dinger equation. It determines a basis of stationary states. In this paper we define the Schr?dinger equation that corresponds with the various levels and we show that each level can be characterized by a unique time scale. We also show how various levels can be synchronized. We believe that this hyperspace level represents a certain level in the physics of consciousness and therefore a level unique time scale can contribute to the time perception of the mind.

Bifurcation and Pattern Recognition  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41005
Abstract: We propose a new approach in dealing with image recognition. We suggest that recognizing an image is related to the knowledge of a pure quantum state. Since most images are screened through incoherent photons, we introduce a method base on non-linear mapping iterations to regenerate coherence between the image photons.
Single Measurement of Figures  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.46111
Abstract:

We introduce a new approach in dealing with pattern recognition issue. Recognizing a pattern is definitely not the exploration of a new discovery but rather the search for already known patterns. In reading for example the same text written in a hand writing, letters can appear in different shapes. Still, the text decoding corresponds with interpreting the large variety of hand writings shapes with fonts. Quantum mechanics also offer a kind of interpretation tool. Although, with the superposition principle it is possible to compose an infinite number of states, yet, an observer by conducting a measurement reduces the number of observed states into the predetermined basis states. Not only that any state collapses into one of the basis states, quantum mechanics also possesses a kind of correction mechanism in a sense that if the measured state is close enough to one of the basis states, it will collapse with high probability into this predetermined state. Thus, we can consider the collapse mechanism as a reliable way for the observer to interpret reality into his frame of concepts. Both interpretation ideas, pattern recognition and quantum measurement are integrated in this paper to formulate a quantum pattern recognition measuring procedure.

Rapid Quantum Search Algorithm  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.49158
Abstract:

The collapse phenomenon, the parallelism principle and states correlation are used to define a type of a Grover rapid search engine. In our approach, the observer’s query and the Grover-unsorted-data are stored in different memories where the global state is represented by a tensor product of the associated states. In the proposed formalism, each query-state input activates an adjusted operator that implements the unsorted state in an appropriate 2-D Grover representation. It will be shown that once the representation is set, it takes mainly two operations to complete the whole query search. This seems to be a very efficient search algorithm.

Homeostasis Processes Expressed as Flashes in a Poincaré Sections  [PDF]
Yehuda Roth
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.912134
Abstract: We describe a homeostasis system with a discrete map that is revealed by stroboscopic “flashes” (Poincaré sections) that are synchronized with the measurement events.
La mitología fronteriza: Turner y la modernidad
Brenna B., Jorge E.;
Estudios fronterizos , 2011,
Abstract: modernity has been creating spaces, new boundaries and borders, as metaphysical, mythological and symbolic marks of physical and imaginary territories. modern space and its borders are metaphors, boundaries that are created, walls that rise to identify with some and categorize others. in this short paper we want to approach the problem of the transformation of the idea of border (geographical, cultural, symbolic, etc.), for a reflection on the transformations of that civilized obsession called border. the border has always been a reference in facing the identities, names, symbols, different imaginary: it is more confrontational line between two otherness. from the previous framework, we reflect on turnerian mythology, as we believe that behind the creation of the imagination of the northern border is the mythical vision of the american frontier as ideological canon that explains and confirms the presence of the white race in a border re-made in the image and likeness of the "american dream". frederick turner's reflection on the role of the frontier in american history is not only the study of the importance of progress towards the west but -even more so, is the analysis of meaning that had the american frontier as a historical process that ended in 1893, as turner said, but rather extended into the twentieth century and continues to constantly shaping the process of territorialization of the border.
De la tragedia al malestar en la cultura: Georg Simmel y Sigmund Freud
Brenna B., Jorge E.;
Argumentos (México, D.F.) , 2009,
Abstract: the purpose of this article is to make a reflection about the diagnostics on the discomfort in the modern culture, elaborated by georg simmel and sigmund freud at the end of xixth century. the idea is to analyze the role that both thinkers assign to the effects on the interior of the individual, caused by the so called illnesses of modernity (rationality, calculation, indifference, repression of the instincts, moral, etcetera). on the other hand, we try to emphasize the originality of both thinkers and, at the same time, the parallelism of his reflections in a time and a contiguous space (vienna and berlin). both reflections sustained in an original style and a will of rupture with the scientific and cultural canons of their time. finally, what we have indicated before is taken to a conclusion in which we have postulated the necessity to reconstruct the principles and the social methods whereupon sciences-especially sociology-approach a social reality in which a subject/object exists and speaks for himself.
DE LA TRAGEDIA AL MALESTAR EN LA CULTURA: GEORG SIMMEL Y SIGMUND FREUD
Jorge E. Brenna B.
Argumentos (México, D.F.) , 2009,
Abstract: El propósito de este artículo es hacer una reflexión cruzada acerca de los diagnósticos sobre el malestar en la cultura moderna elaborados por Georg Simmel y Sigmund Freud a finales del siglo xix. La idea es analizar el papel que ambos pensadores le asignan a los efectos sobre el interior del individuo causados por los llamados males de la modernidad (la racionalidad, el cálculo, la indolencia, la represión de los instintos, la moral, entre otros). Por otra parte, se pretende destacar la originalidad de ambos pensadores y, al mismo tiempo, el paralelismo de sus reflexiones en un tiempo y en un espacio contiguo (Viena y Berlín). Ambas reflexiones sustentadas en un estilo original y una voluntad de ruptura con los cánones científicos y culturales de la época. Finalmente, lo anterior es llevado a una conclusión en la que se postula la necesidad de reconstruir los principios y los métodos con que las ciencias sociales y en especial la sociología se acercan a una realidad social en la que existe un sujeto-objeto que habla de sí.
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