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  • Hindawi  (112)
  • American Physical Society (APS)  (62)
  • 2010-2014  (174)
  • 2005-2009
  • 2014  (174)
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  • 2010-2014  (174)
  • 2005-2009
Year
  • 1
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    Near- and sub-barrier fusion of the Be7+Ni58 system (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-07-30
    Description: Author(s): E. Martinez-Quiroz, E. F. Aguilera, D. Lizcano, P. Amador-Valenzuela, H. García-Martínez, J. J. Kolata, A. Roberts, L. O. Lamm, G. Rogachev, V. Guimarães, F. D. Becchetti, A. Villano, M. Ojaruega, M. Febbraro, Y. Chen, H. Jiang, P. A. DeYoung, and G. F. Peaslee Evaporation proton yields were measured for the fusion of the radioactive proton-rich nucleus Be7 onto a Ni58 target at six near-barrier energies. Total fusion cross sections were deduced by using calculated proton multiplicities. The resulting fusion excitation function shows a considerable enhance... [Phys. Rev. C 90, 014616] Published Tue Jul 29, 2014
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Macroinvertebrate Richness Importance in Coastal Tropical Streams of Esmeraldas (Ecuador) and Its Use and Implications in Environmental Management Procedures (2014)
    Hindawi
    Details
    Publication Date: 2014-01-15
    Description: This study was aimed at determining the performance of some indices and community attributes frequently used to assess river quality and test the role of macroinvertebrate taxa richness as element of bioindication in several coastal tropical streams of western Esmeraldas (Ecuador). In addition, a macroinvertebrate taxon list of this region was provided for the first time. Thirteen sampled points distributed across nine streams were selected for this study and nineteen parameters and attributes of bioindication were tested. The differences between nonimpact and impact places were evaluated mainly using one-way analysis of variance. Jackknife 2 and Clench were used to estimate the regional richness and the quality of the inventory, respectively. Seventy taxa (principally genus and family) of the main groups of macroinvertebrates were collected. Measured richness and family richness were the best metric followed by Biological Monitoring Working Party/Colombia (BMWP/Col), Odonata richness, Shannon-Weiner, and EPT richness (Ephemeroptera + Plecoptera + Trichoptera) indices. Only a slight right trend (Ephemeroptera, Trichoptera, and Chironomidae attributes) or incorrect performances (Average Score Per Taxon (ASPT) and % EPT) were showed by frequently used metrics. Finally, several recommendations were made about taxonomic level used, the ranks of quality of taxa richness, and the effort-results relationship in the field of bioindication.
    Electronic ISSN: 1687-9716
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Hindawi
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  • 3
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    Cavities in curved spacetimes: The response of particle detectors (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-01-14
    Description: Author(s): Aida Ahmadzadegan, Eduardo Martín-Martínez, and Robert B. Mann We introduce a method to compute a particle detector transition probability in spacetime regions of general curved spacetimes provided that the curvature is not above a maximum threshold. In particular we use this method to compare the response of two detectors, one in a spherically symmetric gravi... [Phys. Rev. D 89, 024013] Published Mon Jan 13, 2014
    Keywords: General Relativity and Gravitation
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Field-induced sublimation in perfect two-dimensional colloidal crystals (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-01-14
    Description: Author(s): F. Martínez-Pedrero, J. Benet, J. E. F. Rubio, E. Sanz, R. G. Rubio, and F. Ortega Phase transitions in two-dimensional (2D) systems are of considerable fundamental and practical importance. However, the kinetics of these processes are difficult to predict and understand, even in simple systems for which equilibrium states are properly described, owing to the difficulty of studyin... [Phys. Rev. E 89, 012306] Published Mon Jan 13, 2014
    Keywords: Colloids and Complex Fluids
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
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  • 5
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    Computation of the thermal conductivity using methods based on classical and quantum molecular dynamics (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-01-18
    Description: Author(s): O. N. Bedoya-Martínez, Jean-Louis Barrat, and David Rodney The thermal conductivity of a model for solid argon is investigated using nonequilibrium molecular dynamics methods, as well as the traditional Boltzmann transport equation approach with input from molecular dynamics calculations, both with classical and quantum thermostats. A surprising result is t... [Phys. Rev. B 89, 014303] Published Fri Jan 17, 2014
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Row Spacing, Landscape Position, and Maize Grain Yield (2014)
    Hindawi
    Details
    Publication Date: 2014-01-15
    Description: The use of narrow row spacing for the different landscape positions of a field could punish maize (Zea mays L.) grain yield. Two experiments were conducted (2006/07 and 2007/08) at different landscape positions in the Inland Pampas of Argentina. Hybrid DK190MG was grown at the commonest plant density used at each landscape position (approximately 5.1 plants/m2 at the summit, 6.5 plants/m2 at shoulder-slope position, and 7.6 plants/m2 at foot-slope position) with three row spacings (0.38 m, 0.52 m, and 0.38 m in a skip-row pattern). At the silking stage of maize crops, soil water content (0–200 cm depth) and maximum light capture differed () among landscape positions but were similar among row spacings. Differences in grain yield among landscape positions (mean 806, 893, and 1104 g/m2 at the summit, shoulder-slope position, and foot-slope position, resp.) were related to kernel number/m2 (), which was closely related () to light capture around silking. Grain yield reductions (6 to 20%) were recorded when crops were cultivated in rows 0.38 m apart. The skip-row pattern did not improve grain yield. Maize grain yield was optimized in rows 0.52 m apart along the sandy landscape positions of the fields.
    Print ISSN: 1687-8159
    Electronic ISSN: 1687-8167
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Hindawi
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  • 7
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    Silvopastoral Systems Enhance Soil Quality in Grasslands of Colombia (2014)
    Hindawi
    Details
    Publication Date: 2014-01-23
    Description: In the tropical drylands of Colombia, the soils subjected to traditional systems of livestock production are severely degraded and depleted of plant nutrients. Multistrata silvopastoral systems are viable alternatives to improve livestock production; however, it is unknown whether these systems can reduce the negative environmental impacts of traditional systems on soil quality. The objective of this study was to evaluate the effects of 13-year-old multistrata silvopastoral systems on soil quality parameters in degraded soils of the Sinu River Valley, Colombia. The results show that the trees in the silvopastoral systems increased or maintained soil pH values and nutrient availability (phosphorus, potassium, and calcium) with respect to the pastures with only grasses. The effects were significantly controlled by the types of plant species, particularly Guazuma ulmifolia and Cassia grandis.
    Print ISSN: 1687-7667
    Electronic ISSN: 1687-7675
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Hindawi
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  • 8
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    Achromatic Fresnel Lens with Improved Efficiency for PV Systems (2014)
    Hindawi
    Details
    Publication Date: 2014-03-13
    Description: This work is aimed to design and evaluate different achromatic Fresnel lens solutions capable of operating as concentrators aimed at photovoltaic cells systems. Throughout this study, the theoretical parametric design of the achromatic lens will be shown together with a series of simulations to verify the performance of each lens topology. The results will be compared with a standard Fresnel lens to ascertain the validity and effectiveness of the obtained design. Finally, a novel kind of hybrid lens is proposed, which combines the advantages of each type of lens (standard and Fresnel) according to the optimal operating region of each design. Efficiency and concentration ratios of each particular lens are shown, regarding lens dimension, light’s incidence angle, or wavelength. Through this innovative achromatic design concentration ratios above 1000 suns, which hardly reach standard Fresnel lenses. Furthermore chromatic dispersion is minimized and the efficiency rate is over 85% of efficiency for a wide spectral range (from 350 nm to 1100 nm).
    Print ISSN: 1110-662X
    Electronic ISSN: 1687-529X
    Topics: Electrical Engineering, Measurement and Control Technology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Hindawi
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  • 9
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    Variations in the Flow Approach to CFCLP-TC for Multiobjective Supply Chain Design (2014)
    Hindawi
    Details
    Publication Date: 2014-03-14
    Description: We review the problem for the design of supply chains called Capacitated Fixed Cost Facility Location Problem with Transportation Choices (CFCLP-TC). The problem is based on a production network of two echelons with multiple plants, a set of potential distribution centers, and customers. The problem is formulated as an optimization model with two objective functions based on time and cost. This paper proposes three changes to the original model to compare the sets of efficient solutions and the computational time required to obtain them. The main contribution of this paper is to extend the existing literature by incorporating approaches for the supply of product to customers through multiple sources, the direct flow between plants and customers, without this necessarily implying removing the distribution centers, and the product flow between distribution centers. From these approaches, we generate mathematical programming models and propose to solve through the epsilon-constraint approach for generating Pareto fronts and thus compare each of these approaches with the original model. The models are implemented in GAMS and solved with CPLEX.
    Print ISSN: 1024-123X
    Electronic ISSN: 1563-5147
    Topics: Mathematics , Technology
    Published by Hindawi
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  • 10
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    Casimir forces on atoms in optical cavities (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-03-21
    Description: Author(s): Álvaro M. Alhambra, Achim Kempf, and Eduardo Martín-Martínez Casimir-type forces, such as those between two neutral conducting plates, or between a sphere, atom, or molecule and a plate, have been widely studied and are becoming of increasing significance, for example, in nanotechnology. A key challenge is to better understand, from a fundamental microscopic ... [Phys. Rev. A 89, 033835] Published Thu Mar 20, 2014
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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