A Discussion on Supersymmetric Cosmic Strings with Gauge-Field Mixing

In this paper, following a stream of investigation on supersymmetric gauge theories with cosmic string solutions, we contemplate the possibility of building up a D-and-F term cosmic string by means of a gauge-field mixing in connection with a U(1) x U(1)'-symmetry. The spontaneous break of both gauge symmetry and supersymmetry are thoroughly analysed and the fermion zero-modes are worked out. The role of the gauge-field mixing parameter is elucidated in connection with the string configuration that comes out. As an application of the model presented here, we propose the possibility that the supersimetric cosmic string yield production of fermionic charge carriers that may eject, at their late stages, particles that subsequently decay to produce cosmic rays of ultra-high energy. In our work, it turns out that massive supersymmetric fermionic partners may be produced for a susy breaking scale in the range 10^{11} to 10^{13} GeV, which is compatible with the phenomenology of a gravitino mass at the TeV scale. We also determine the range of the gauge-field mixing parameter, \alpha, in connection with the mass scales of the present model.Comment: 7 pages, no figures, ReVTex format, to appear in New Journal of Physic

Soil aggregation under different management systems

Considering that the soil aggregation reflects the interaction of chemical, physical and biological soil factors, the aim of this study was evaluate alterations in aggregation, in an Oxisol under no-tillage (NT) and conventional tillage (CT), since over 20 years, using as reference a native forest soil in natural state. After analysis of the soil profile (cultural profile) in areas under forest management, samples were collected from the layers 0-5, 5-10, 10-20 and 20-40 cm, with six repetitions. These samples were analyzed for the aggregate stability index (ASI), mean weighted diameter (MWD), mean geometric diameter (MGD) in the classes > 8, 8-4, 4-2, 2-1, 1-0.5, 0.5-0.25, and < 0.25 mm, and for physical properties (soil texture, water dispersible clay (WDC), flocculation index (FI) and bulk density (Bd)) and chemical properties (total organic carbon - COT, total nitrogen - N, exchangeable calcium - Ca2+, and pH). The results indicated that more intense soil preparation (M < NT < PC) resulted in a decrease in soil stability, confirmed by all stability indicators analyzed: MWD, MGD, ASI, aggregate class distribution, WDC and FI, indicating the validity of these indicators in aggregation analyses of the studied soil

Serological identification of virus in watermelon production fields in the Tocantins State.

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ARANEOMORPHAE: Development of an application for the identification of the taxonomic key of arachnid families in Brazil

This study aimed to evaluate an application to support decision making in the identification process of taxonomic arachnids of families in Brazil. The device was developed by Ionic framework used to develop hybrid applications and with the help of Java Script programming language and the angular JS framework. With convenience, speed, easy handling and low cost maintenance, the digital system called for their Araneomorphae authors is an App (Application) and this digital system, professionals and lay people will perform clearly and dynamic identification and classification of specimens arachnids, reducing the time to research and understanding of their taxonomy. To review the application, a taxonomic key was used containing the figure of six Brazilian arachnids for identifying a period of 30 minutes. Were invited 200 students from five undergraduate classes in Biological Sciences from the Lutheran University Center Palmas - CEULP / ULBRA, Tocantins state for the key printed taxonomic, the vast majority of students (81%) took more than 30 minutes to identify the six species, whereas with application USAge, 91.3% of identified species of arachnids in less than five minutes. The application proved practical, easy to understand and use, and can assist in supporting decision making to identify and rank the most common early specimens of arachnids

Assessment of the proportionality of skin folds between professional footballers and alternate, Peruvian

El objetivo del estudio fue proporcionar información descriptiva sobre las diferencias de proporcionalidad de la masa corporal y pliegues cutáneos entre jugadores titulares y reservas en función de la posición de juego. Fueron seleccionados de forma no probabilística 4 clubes profesionales de Primera División del Fútbol Profesional Peruano, considerándose 44 titulares y 28 reservas. Se evaluó la masa corporal, estatura, seis pliegues cutáneos, determinándose la proporcionalidad corporal por medio de la estrategia del Phantom. Los resultados muestran que la proporcionalidad de la masa corporal y los pliegues cutáneos es similar, tanto de forma general y por ubicación de juego, no existiendo diferencias significativas entre las posiciones de juego y entre titulares y suplentes. En conclusión, todos los jugadores, independientemente de la posición de juego y la titularidad y/o suplencia muestran similares valores de proporcionalidad corporal y de pliegues cutáneos, mostrando en general altos valores de masa corporal y bajos niveles de tejido adiposo.The aim of the study was to provide descriptive information about the differences in proportionality of body mass and skinfold thickness between starters and reserves as playing position. They were selected in a non-probabilistic 04 professional clubs in the First Division of Professional Football Peruvian, considering 44 starters and 28 reserves. We assessed body mass, height, six skinfolds, body proportionality determined by the strategy of the Phantom. The results show that the proportionality of body mass and skinfold is similar, both generally and by playing position, with no significant differences between playing positions and titular or alternate players. In conclusion, all players regardless of playing position and title and/or substitution proportionality show similar values and skinfold body, showing generally high body mass values and low levels of fat.Peer Reviewe

Quality index of an Oxisol under different management systems in the Brazilian Cerrado.

Avaliar a qualidade dos solos sob diferentes culturas de cobertura ou sob diferentes sistemas de manejo torna-se essencial à sua conservação. Objetivou-se neste estudo avaliar um Oxisol cultivado com milho e algodão, após diferentes sucessões culturas e sob sistema plantio direto (SPD) e plantio convencional (PC), por meio de índice de qualidade do solo (IQS), utilizando como referência uma área de Cerrado nativo. O estudo foi realizado no município de Luís Eduardo Magalhães, Oeste da Bahia, Brasil. Amostras de solo com estrutura preservada e não preservada foram coletadas nas camadas de 0-0,05 m; 0,05-0,10 m e 0,10-0,20 m, para determinação da macroporosidade, densidade do solo, água disponível, teores de carbono orgânico total, argila dispersa em água e grau de floculação. As médias dos atributos mensurados nos tratamentos e o índice de qualidade do solo, que foi elaborado pelo método dos desvios dos valores dos atributos medidos nos tratamentos em relação à área de referência, seguido da normalização, foram comparados pelo teste de Duncan (p &#8804; 0,05). O solo sob PC, em todos os tratamentos, teve a sua qualidade reduzida quando comparado com o SPD, além disso, o IQS utilizado foi sensível para detectar as alterações provocadas pelos sistemas de manejo e atribuir escores coerentes à qualidade do solo avaliado

Two-Dimensional Carrier-Carrier Screening in a Quantum Well

The behavior of carrier-carrier screening is investigated in a GaAs-GaAIAs quantum well structure by measuring the band-to-band polarization dephasing with femtosecond photon echoes. The variation of the electron-hole polarization dephasing time with the carrier concentration reveals the two-dimensional character of the short range screening between the interacting carriers

Manejo de temperatura nas fases iniciais de vida não produz efeitos permanentes no desempenho produtivo de tambaqui na fase juvenil.

O desenvolvimento inicial de peixes é a fase mais crítica para a formação dos indivíduos adultos, pois orienta a formação morfológica e funcional do organismo e exerce influência direta sobre o sucesso produtivo. Estudar o efeito e a perpetuação das manipulações ambientais, especialmente de temperatura, sobre o desempenho de peixes é de extrema importância, em particular para o tambaqui, que é uma das espécies de interesse comercial para a aquicultura sul-americana

Feasibility and Environmental Sustainability of a 103.5 kWp floating Photovoltaic Electrical System with a Case Study in a Hydroelectric Power Plant, Santa Clara Hpp, Located in the South of Brazil Region

Typical environmental problems associated with the implementation of solar photovoltaic systems for the generation of peak electrical energy, on a larger scale, such as on the order of 1 MWp, is in the occupied area, usually more than 3 km2. This can be minimized by the use of water parks or water dam&rsquo;s reservoir, small and large hydroelectric power plants dams. Both the terrestrial and aquatic systems can impact the site, the first one, for the need to promote earthworks, removal of extensive green areas in the surroundings, installation of new transmission line, among others; and the second, despite the fact that a flat surface is already used and that there is no need for new civil procedures for its installation and can normally take advantage of the existing power transmission line, may cause changes in the biota of the reservoir, depending on the shading areas on the surface of the lake. Due to these facts, this research was proposed to investigate, parameterize and tropicalize an electric power generation system based on floating silicon photovoltaic cell panels installed in the Santa Clara HPP reservoir, in terms of peak power, durability, aspects and environmental impacts, with the study of possible evolutionary improvements of the project such as "tracking" or solar tracking, as well as dynamism of the structure, allowing the shadow area to be shifted over time, minimizing its effects in the local biota

New and rare records of teleost fishes from the Cape Verde Islands (eastern-central Atlantic Ocean)

As a result of six exploratory surveys and several opportunistic catches in the Cape Verde Islands from a few metres to about 1000 m of depth, a list of 66 species of teleost fishes is given, six of which are first records from the archipelago: Gnathophis mystax (Congridae), Nezumia africana, Nezumia duodecim (Macrouridae), Ectreposebastes imus (Scorpaenidae), Paraliparis sp. (Liparidae) and Lappanella fasciata (Labridae). Additionally, data on six poorly-known species is also given: Myroconger compressus (Myrocongridae), Myrichthys pardalis, Phaenomonas longissima (Ophichthidae), Sphagemacrurus hirundo (Macrouridae), Gadella imberbis and Physiculus cyanostrophus (Moridae). Data includes distribution, habitat, morphometry and reproduction.Six campagnes exploratoires ainsi que quelques captures opportunistes réalisées de quelques mètres jusqu’à environ 1000 m de profondeur aux îles du Cap-Vert ont permis d’établir une liste comprenant 66 espèces de poissons téléostéens. Six espèces sont signalées pour la première fois aux îles du Cap-Vert : Gnathophis mystax (Congridae), Nezumia africana, Nezumia duodecim (Macrouridae), Ectreposebastes imus (Scorpaenidae), Paraliparis sp. (Liparidae) et Lappanella fasciata (Labridae). La présence de six autres espèces mal connues est confirmée pour cet archipel : Myroconger compressus (Myrocongridae), Myrichthys pardalis, Phaenomonas longissima (Ophichthidae), Sphagemacrurus hirundo (Macrouridae), Gadella imberbis et Physiculus cyanostrophus (Moridae). Les données présentées concernent la distribution, l’habitat, la morphométrie et la reproduction.Postprin