Double beta decay of 100Mo^{100}Mo: the deformed limit

The double beta decay of $^{100}Mo$ to the ground state and excited states of $^{100}Ru$ is analysed in the context of the pseudo SU(3) scheme. The results of this deformed limit are compared with the vibrational one based on the QRPA formalism. Consistency between the deformed limit and the experimental information is found for various $\beta\beta$ transitions, although, in this approximation some energies and B(E2) intensities cannot reproduced.Comment: 16 pages, revtex, no figures. Submmitted to Phys. Rev.

Electronic emission of radio-sensitizing gold nanoparticles under X-ray irradiation : experiment and simulations

In this paper we present new results on electronic emission of Gold Nanoparticles (GNPs) using X-ray photoelectron spectroscopy (XPS) and compare them to the gold bulk electron emission. This subject has undergone new interest within the perspective of using GNPs as a radiotherapy enhancer. The experimental results were simulated using various models (Livermore and PENELOPE) of the Geant 4 simulation toolkit dedicated to the calculation of the transportation of particles through the matter. Our results show that the GNPs coating is a key parameter to correctly construe the experimental GNPs electronic emission after X-ray irradiation and point out some limitations of the PENELOPE model. Using XPS spectra and Geant4 Livermore simulations,we propose a method to determine precisely the coating surface density of the GNPs. We also show that the expected intrinsic nano-scale electronic emission enhancement effect - suspected to contribute to the GNPs radio-sensitizing properties - participates at most for a few percent of the global electronic emission spectra of the GNPs compared to gold bulk.Comment: Journal: Journal of Nanoparticle Research Vol. 16,4 201

Classical mappings of the symplectic model and their application to the theory of large-amplitude collective motion

We study the algebra Sp(n,R) of the symplectic model, in particular for the cases n=1,2,3, in a new way. Starting from the Poisson-bracket realization we derive a set of partial differential equations for the generators as functions of classical canonical variables. We obtain a solution to these equations that represents the classical limit of a boson mapping of the algebra. The relationship to the collective dynamics is formulated as a theorem that associates the mapping with an exact solution of the time-dependent Hartree approximation. This solution determines a decoupled classical symplectic manifold, thus satisfying the criteria that define an exactly solvable model in the theory of large amplitude collective motion. The models thus obtained also provide a test of methods for constructing an approximately decoupled manifold in fully realistic cases. We show that an algorithm developed in one of our earlier works reproduces the main results of the theorem.Comment: 23 pages, LaTeX using REVTeX 3.

SIGNALS FOR MINIMAL SUPERGRAVITY AT THE CERN LARGE HADRON COLLIDER: MULTI-JET PLUS MISSING ENERGY CHANNEL,

We use ISAJET to perform a detailed study of the missing transverse energy \eslt plus multi-jet signal expected from superparticle production at the CERN LHC. Our analysis is performed within the framework of the minimal supergravity model with gauge coupling unification and radiative electroweak symmetry breaking. We delineate the region of parameter space where the \eslt supersymmetry signal should be observable at the LHC and compare it to the regions explorable via searches for sleptons and for chargino/neutralino production. We confirm that, given a data sample of 10~\fb^{-1}, $m_{\tg}\sim 1300$ GeV can be explored if m_{\tq}\gg m_{\tg}, while $m_{\tg}\sim 2000$ GeV can be probed if m_{\tq}\simeq m_{\tg}. We further examine what information can be gleaned from scrutinizing this event sample. For instance, the multi-jet multiplicity yields information on whether squark production makes a significant contribution to the observed \eslt sample. Furthermore, reconstructing hemispheric masses may yield a measure of $m_{\tg}$ to $\sim 15-25\%$. Finally, for favourable ranges of parameters, by reconstructing masses of tagged $b\bar{b}$ jet pairs, it may be possible to detect Higgs bosons produced via sparticle cascade decay chains.Comment: 22 pages (REVTEX); a PS text file (etmiss.ps) and 12 figures (etlhc.uu or etlhc.ps) can be obtained via anonymous ftp at ftp://hep.fsu.edu/anonymous.bae

SUPERSYMMETRY REACH OF AN UPGRADED TEVATRON COLLIDER

We examine the capability of a $\sqrt{s}=2$ TeV Tevatron $p\bar p$ collider to discover supersymmetry, given a luminosity upgrade to amass $25\ fb^{-1}$ of data. We compare with the corresponding reach of the Tevatron Main Injector ($1\ fb^{-1}$ of data). Working within the framework of minimal supergravity with gauge coupling unification and radiative electroweak symmetry breaking, we first calculate the regions of parameter space accessible via the clean trilepton signal from \tw_1\tz_2\to 3\ell +\eslt production, with detailed event generation of both signal and major physics backgrounds. The trilepton signal can allow equivalent gluino masses of up to $m_{\tg}\sim 600-700$ GeV to be probed if $m_0$ is small. If $m_0$ is large, then $m_{\tg}\sim 500$ GeV can be probed for $\mu 0$ and large values of $m_0$, the rate for \tz_2\to\tz_1\ell\bar{\ell} is suppressed by interference effects, and there is {\it no} reach in this channel. We also examine regions where the signal from \tw_1\overline{\tw_1}\to \ell\bar{\ell}+\eslt is detectable. Although this signal is background limited, it is observable in some regions where the clean trilepton signal is too small. Finally, the signal \tw_1\tz_2\to jets+\ell\bar{\ell} +\eslt can confirm the clean trilepton signal in a substantial subset of the parameter space where the trilepton signal can be seen. We note that although the clean trilepton signal may allow Tevatron experiments to identify signals in regions of parameter space beyond the reach of LEP II, the dilepton channels generally probe much the same region as LEP II.Comment: 19 page REVTEX file; a uuencoded PS file with PS figures is available via anonymous ftp at ftp://hep.fsu.edu/preprints/baer/FSUHEP950301.u

Learning, Prediction and Planning with Approximate Forward Models

The capacity to build internal representations of the world provides an agent with the opportunity to use them to act in its surroundings more appropriately. These internal representations may capture complex associations and keep track of the state of the agent and the environment. One of the most striking aspects of this phenomenon is that the agent may manipulate these internal representations to consider the distant future, and to formulate plans likely to lead to beneficial outcomes. Our treatment in this thesis considers this particular class of agents referred to as model-based. The behaviour of these agents is not only contingent upon the current sensory stream and their memory, but also based on hypothetical future sensory streams that are produced from potential sequences of actions. Throughout this thesis, there are two main themes that we explore and that are fundamental for advancing our understanding of model-based agents. The first is the agent's uncertainty about its environment and how it influences its decision-making. There are multiple aspects one could investigate about this relation. We analyse two specific scenarios. The first illustrates how it is possible to harness the agent's uncertainty to devise error-correction schemes. In the second, a probability distribution that defines the agent's current model is used to derive intrinsic utility signals to guide behaviour. The other main theme that permeates this thesis is the question of what are the aspects of the external world that should be stored and represented by an internal model? This question has important consequences for the design of learning objectives. As we will see in this thesis, we start with perhaps the most conceptually intuitive way to frame a learning objective for acquiring a world model. Namely, the assumption that the agent must be able to predict as accurately as possible its future observations. From this starting point, we progress towards learning objectives that introduce additional prediction targets or constraints to aim for a compressed and more essential representation of an observation. This theme concludes by trying to gain some perspective on whether it is possible, and even desirable, to attempt to have an internal model that tries to map the external observations, as we start to consider information-theoretic notions of relevance. Our results show that these design choices can have a profound effect on performance, even when the planning machinery is identical, and demonstrate the importance of building world models aligned with the agent's behavioural objectives

Anomaly-Free Gauged R-Symmetry

We review the gauging of an R-symmetry in local and global susy. We then construct the first anomaly-free models. We break the R-symmetry and susy at the Planck scale and discuss the low-energy effects. We include a solution to the mu-problem, and the prediction of observable effects at HERA. The models also nicely allow for GUT-scale baryogenesis and R-parity violation without the sphaleron interactions erasing the baryon-asymmetry.Comment: 6 pages, latex, no figures. Talk presented at SUSY-95. Work done in collaboration with A. Chamseddin

Factores determinantes en la selecci?n de vivienda social en el Per? : evidencia de un estudio en Chincha

Este estudio tuvo por objetivo determinar atributos m?s importantes que el comprador de vivienda social tiene en cuenta al momento de optar por una vivienda a fin de que las diferentes entidades privadas y no privadas las puedan tomar en cuenta al momento de realizar los dise?os de sus proyectos inmobiliarios de vivienda social. La hip?tesis planteada es que existe un grupo de factores que son determinantes en el momento de la decisi?n de compra de la vivienda social en nuestro pa?s. Adicionalmente se busca determinar el orden de importancia o preferencia entre estos factores

APRENDIZAJE SERVICIO COMO ESTRATEGIA PARA LA INTEGRACI 3N DE PERSONAS CON DISCAPACIDAD A LAS ACTIVIDADES AGR\ucdCOLAS

El prop\uf3sito fue analizar el aprendizaje servicio como estrategia para la integraci\uf3n de personas con discapacidad a las actividades agr\uedcolas. Desde el servicio comunitario estudiantil del Decanato de Agronom\ueda se desarrollan proyectos diversos donde destaca la atenci\uf3n a personas con discapacidad. Tal es el caso, del proyecto realizado en el Peque\uf1o Cottolengo Don Orione, instituci\uf3n sin fines de lucro que de forma gratuita presta servicio y atenci\uf3n integral a m\ue1s de 130 personas con diversidad funcional, con bajas posibilidades de independencia para el trabajo y carentes de un n\ufacleo familiar. El objetivo del proyecto del servicio comunitario fue desarrollar actividades agr\uedcolas para la producci\uf3n de alimentos y ornamentales en sus instalaciones. De \ue9ste se deriva el presente estudio con un abordaje cualitativo de investigaci\uf3n-acci\uf3n participativa siendo un m\ue9todo sistem\ue1tico e intencional de indagaci\uf3n para reflexionar y actuar sobre los problemas derivados de la realidad. El an\ue1lisis de la informaci\uf3n se presenta en tres contextos: (a) los resultados del proyecto: veinticinco (25) miembros del personal capacitado, treinta y cinco (35) j\uf3venes y adultos residentes, capacitados e incorporados a labor terapia, tres (3) hect\ue1reas de superficie incorporada a la producci\uf3n y tres (3) estructuras protegidas usadas eficazmente. (b) sistematizaci\uf3n de la experiencia de los estudiantes, quienes manifestaron que trabajar con personas con diversidad funcional agudiza su sentido de la justicia, tolerancia, amistad y humildad; (c) la opini\uf3n del personal, donde destacan que las actividades agr\uedcolas para la incorporaci\uf3n de los j\uf3venes con discapacidad fomentaron la motivaci\uf3n, habilidades, destrezas, mejoraron el estado de \ue1nimo de los participantes, la integraci\uf3n social y laboral. En consecuencia, el aprendizaje servicio demuestra su importancia en la incorporaci\uf3n de las personas con discapacidad a las labores agr\uedcolas. Palabras claves: personas con discapacidad, aprendizaje servicio, actividades agr\uedcolas. Abstract The purpose was to analyze service learning as a strategy for integration of people with impairments to agricultural activities. From student community service of \u93Decanato de agronom\ueda\u94 (Agronomy Deanship), diverse projects are developed where attention to persons with impairments in highlighted. This is the case of the project developed in \u93Peque\uf1o Cottolengo Don Orione\u94a non-profit organization that provides free of charge service and attention to over 130 persons with dysfunctional diversity, with low possibilities of independence for work and no family. Main objective of this community service research was to develop agricultural activities for food and ornament production in their facilities. This leads to the present research with a qualitative approach of \u93investigaci\uf3n-acci\uf3n participative\u94 (Participative research-action) being an international and systematic method for inquire and reflect about the problems derived in reality. Analysis of information is presented in three contexts: (a)results of project: twenty five (25) members of trained staff, thirty five (35) young and adult residents, trained and incorporated to therapy labor, three (3) hectares of land incorporated to production and three (3) protected structures used efficiently. (b) systematization of experience of students who manifested that working with people with functional diversity sharpens their sense of justice , tolerance, friendship and humility; (c) Staff opinion, where agricultural activities for incorporation of young men and women with an impairment are emphasized fomented motivation, capabilities, they improved the mood of participants, social and labor integration. In consequence, service learning shows its importance in the incorporation of persons with impairments to agricultural labors. Keywords: persons with impairments, service learning, agricultural activities. <br