2,903 research outputs found

    Work Motivation and Job Satisfaction of Employees before and after Company Reorganization: A Case of an Electric Cooperative in the Philippines

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    This study was conducted to determine and compare the work motivation and job satisfaction of the employees before and after the cooperative reorganized sometime in 2015. Using descriptive comparative research design with survey questionnaire as data gathering instrument, the study involved 70 purposively chosen respondents from the said cooperative found out that motivation and job satisfaction levels of the respondents significantly increased after the reorganization. The study recommends that the current management continue striving to keep the level high

    A Comprehensive X-ray Absorption Model for Atomic Oxygen

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    An analytical formula is developed to represent accurately the photoabsorption cross section of O I for all energies of interest in X-ray spectral modeling. In the vicinity of the Kedge, a Rydberg series expression is used to fit R-matrix results, including important orbital relaxation effects, that accurately predict the absorption oscillator strengths below threshold and merge consistently and continuously to the above-threshold cross section. Further minor adjustments are made to the threshold energies in order to reliably align the atomic Rydberg resonances after consideration of both experimental and observed line positions. At energies far below or above the K-edge region, the formulation is based on both outer- and inner-shell direct photoionization, including significant shake-up and shake-off processes that result in photoionization-excitation and double photoionization contributions to the total cross section. The ultimate purpose for developing a definitive model for oxygen absorption is to resolve standing discrepancies between the astronomically observed and laboratory measured line positions, and between the inferred atomic and molecular oxygen abundances in the interstellar medium from XSTAR and SPEX spectral models

    On 32-GHz cryogenically cooled HEMT low-noise amplifiers

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    The cryogenic noise temperature performance of a two-stage and a three-stage 32 GHz High Electron Mobility Transistor (HEMT) amplifier was evaluated. The amplifiers employ 0.25 micrometer conventional AlGaAs/GaAs HEMT devices, hybrid matching input and output microstrip circuits, and a cryogenically stable dc biasing network. The noise temperature measurements were performed in the frequency range of 31 to 33 GHz over a physical temperature range of 300 K down to 12 K. Across the measurement band, the amplifiers displayed a broadband response, and the noise temperature was observed to decrease by a factor of 10 in cooling from 300 K to 15 K. The lowest noise temperature measured for the two-stage amplifier at 32 GHz was 35 K with an associated gain of 16.5 dB, while the three-stage amplifier measured 39 K with an associated gain of 26 dB. It was further observed that both amplifiers were insensitive to light

    Atomic Processes in Planetary Nebulae and H II Regions

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    Spectroscopic studies of Planetary Nebulae (PNe) and H {\sc ii} regions have driven much development in atomic physics. In the last few years the combination of a generation of powerful observatories, the development of ever more sophisticated spectral modeling codes, and large efforts on mass production of high quality atomic data have led to important progress in our understanding of the atomic spectra of such astronomical objects. In this paper I review such progress, including evaluations of atomic data by comparisons with nebular spectra, detection of spectral lines from most iron-peak elements and n-capture elements, observations of hyperfine emission lines and analysis of isotopic abundances, fluorescent processes, and new techniques for diagnosing physical conditions based on recombination spectra. The review is directed toward atomic physicists and spectroscopists trying to establish the current status of the atomic data and models and to know the main standing issues.Comment: 9 pages, 1 figur

    Continuous multi-criteria methods for crop and soil conservation planning on La Colacha (RĆ­o Cuarto, Province of Cordoba, Argentina)

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    Agro-areas of Arroyos Menores (La Colacha) west and south of Rand south of R?o Cuarto (Prov. of Cordoba, Argentina) basins are very fertile but have high soil loses. Extreme rain events, inundations and other severe erosions forming gullies demand urgently actions in this area to avoid soil degradation and erosion supporting good levels of agro production. The authors first improved hydrologic data on La Colacha, evaluated the systems of soil uses and actions that could be recommended considering the relevant aspects of the study area and applied decision support systems (DSS) with mathematic tools for planning of defences and uses of soils in these areas. These were conducted here using multi-criteria models, in multi-criteria decision making (MCDM); first of discrete MCDM to chose among global types of use of soils, and then of continuous MCDM to evaluate and optimize combined actions, including repartition of soil use and the necessary levels of works for soil conservation and for hydraulic management to conserve against erosion these basins. Relatively global solutions for La Colacha area have been defined and were optimised by Linear Programming in Goal Programming forms that are presented as Weighted or Lexicographic Goal Programming and as Compromise Programming. The decision methods used are described, indicating algorithms used, and examples for some representative scenarios on La Colacha area are given

    Papel de las bacterias del Ɣcido lƔctico en verduras fermentadas

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    The consumption of fermented vegetables is widespread throughout the world and represents an important component of the human diet with considerable contribution to the food supply for a world populaĀ­tion in continuous growth. Many of the fermented vegetables share a general process which requires salting and acidification steps. Among the microorganisms responsible for fermentation, lactic acid bacteria are the most relevant with important organoleptic, quality and safety benefits. This review deals with the microbial ecology of fermented vegetables focusing on the biodiversity of lactic acid bacteria, the most important molecular techĀ­niques used for their identification and genotyping, their importance for the formation of biofilms as well as their use as starter cultures for obtaining high-quality and safe vegetable products.El consumo de vegetales fermentaĀ­dos estĆ” muy extendido en el mundo y representa un componente importante de la dieta humana con un apoyo considerable a la cadena alimentaria para una poblaciĆ³n mundial en continuo crecimiento. Muchos de los vegeĀ­tales fermentados comparten un proceso general, que requiere una puesta en salmuera y acidificaciĆ³n. Entre los microorganismos responsables de la fermentaciĆ³n, las bacterias del Ć”cido lĆ”ctico son las mĆ”s relevantes con una importante influencia sobre aspectos organolĆ©pticos, de calidad y seguridad del producto final. Esta revisiĆ³n trata sobre la ecologĆ­a microbiana de los vegetales fermentados, prestando especial atenciĆ³n a la biodiversidad de las bacterias del Ć”cido lĆ”ctico, las tĆ©cnicas moleculares mĆ”s importantes utilizadas para su identificaciĆ³n y genotipado, su importancia para la formaciĆ³n de biofilms y su uso como cultivos iniciadores multifuncionales para la obtenciĆ³n de productos vegetales de alta calidad y seguridad

    The decay bā†’sĪ³b\to s\gamma in the presence of a constant antisymmetric tensor field

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    A constant antisymmetric 2-tensor can arise in general relativity with spontaneous symmetry breaking or in field theories formulated in a noncommutative space-time. In this work, the one-loop contribution of a nonstandard WWĪ³WW\gamma vertex on the flavor violating quark transition qiā†’qjĪ³q_i\to q_j\gamma is studied in the context of the electroweak Yang-Mills sector extended with a Lorentz-violating constant 2-tensor. An exact analytical expression for the on shell case is presented. It is found that the loop amplitude is gauge independent, electromagnetic gauge invariant, and free of ultraviolet divergences. The dipolar contribution to the bā†’sĪ³b\to s\gamma transition together with the experimental data on the Bā†’XsĪ³B\to X_s\gamma decay is used to derive the constraint Ī›LV>1.96\Lambda_{LV}>1.96 TeV on the Lorentz-violating scale.Comment: 14 pages and 2 figure

    Loop Quantization of the Supersymmetric Two-Dimensional BF Model

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    In this paper we consider the quantization of the 2d BF model coupled to topological matter. Guided by the rigid supersymmetry this system can be viewed as a super-BF model, where the field content is expressed in terms of superfields. A canonical analysis is done and the constraints are then implemented at the quantum level in order to construct the Hilbert space of the theory under the perspective of Loop Quantum Gravity methods.Comment: 17 pages, Late
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