Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The double energy method has been used by several authors to measure the mass (A *) and total kinetic energy (EKT *) distribution of the complementary fragments from spontaneous fission of 252Cf, finding an broadening of the distribution standard deviation EKT * (σEKT *) in the region near mass symmetry (A * = 226). Using Monte Carlo method, we show that this broadening is because for each value of A * an overlapping of distributions EKT * for primary fragments with two or more neighboring masses, respectively, are produced.

In Precolumbian times, silversmiths used different casting techniques to make their metal works. One of them was casting with bivalve molds made with clay and organic temper. The same technique can be seen nowadays at San Pablo de Canchis, where Cuzco silversmiths made their works with similar techniques to those of Precolumbian times. In order to determine if there was a technology transfer between Precolumbian silversmiths and San Pablo's, we have analized molds from the Inca cemetery of Rinconada Alta, La Molina, in Lima, and also molds from San Plablo de Canchis, using scanning electron microscope and energy dispersive spectroscopy (SEM-EDAX), X ray fluorescence (XRF) and X ray diffraction (XRD).

The present work realized in the facilities of the School of Officials and of the Service of Maintenance of the Air Force of Peru, located in the Air Base "Las Palmas" - Rut, with the aim to determine the aerodynamic response of the plane of training BD-4BP, known as "Kuntur", to the cruising speed of 174 MPH [1,2]. The Kuntur, it is a plane designed and constructed in Peru and possesses hybrid technology, there is for it the importance of developing this work. For the development of the present investigation the deductive methodology was applied, with which they could determine the vectors of speed and pressure concerning the plane, for it there used the computational software in dynamics of fluids - CFD "Fluent", which realizes a calculation based on the method of finite volumes [3,4]. Materials that were in use were, a personal computer Pentium IV with high speed of processing of information, the software CDF Fluent v6.2, models to scale and a tunnel of subsonic wind. The simulation is realized in 2D and first mesh the plane, for which the structures are defined and later there are placed the aerodynamic parameters (speed of plane, atmospheric pressure, viscosity of the fluid, number of Reynolds, type of flow, quantity of interactions), there being obtained by it values that after realizing the statistical treatment are presented in tables and graphs. The results presented in this work correspond to the simulation and show the profiles of speed and of pressure in the different points of the aircraft; this way also, the evaluations are realized to different angles of assault of the aircraft the turbulence being observed concerning the profile, concluding that the angle of assault does not exceed the 18 º that it enters loss. It is recommended to continue by the investigation in 3 dimensions, in order that it complements the design and performance of the plane of training Kuntur.

Research was intended to evaluator tomato development postharvest comes from the Valley of Santa, Ancash. It was harvested in physiological maturity, analyzing the tomato up to his sensory maturity. The evaluations were content of vitamin C, lost weigh, solid solubles, pH, acidity, maturity rate, respiration rate, color, humidity. At the end of the analysis, is established that the vitamin C (mg/100gr) content decreases from 85±0,04 (1 stage), to 26±0,03 (7 stage),. Whereas from the first to the last day, the results its weight diminishes in 5,79 %, soluble solid increases from 4,0±0,10 to 7,5±0,01; pH decreases from 4,38±0,02 to 4,94±0,03; acidity decreases (6,45 % ± 0,02 % - 2,69 % ± 0,01 %); the rate respiration immediately after being harvested increases significantly from 40,42±0,10 to 71,12±0,96 (6 stage), whereas in the 7 stage diminishes 64,33±0,11 and the color, being green color to red total.

Basal like breast cancer (BLBC) composes up to 15% of breast cancer (BC) and is characterized by low or absent expression of estrogen receptor (ER), progesterone receptor (PR), lack of HER2 gene amplification and expression of basal cytokeratins (Cks) 5, 6, 14 and/or 17, epidermal growth factor receptor (EGFR) and/or C-Kit. BLBC constitutes a distinct clinical entity and is associated with poorer clinical outcome (Sørlie et al. 2001). The principal objective of this project is the complete and comparative mapping of genomic abnormalities in a series of BLBC associated or not to BRCA1 mutations and explores the role of the BRCA1 pathway in BLBC. For this reason, we are evaluating a 2.1 M feature human exome capture array on 9 frozen samples obtained from the Pathology Department of Centre Jean Perrin. By the time, we identified on one individual (MCD-4) 11,109 variants, of which 7,113 (64%) were described as known single nucleotide polymorphism (SNP) based on the conservative HCDiff algoritrhm. In regards to the distribution of these variations, chromosomes 10 and 2 were most affected. The novel somatic variations will be confirmed by conventional sequencing. The analyses of the remaining patients are ongoing. Using this next generation methodology, we will contribute to identify new markers or therapeutic targets and help to complete a catalogue of recurrent somatic and inherited variants associated with the development of BLBC.

One of the organic compounds more sensitive to temperature, storage and radiation is ascorbic acid. In an irradiation plant quarantine treatment, be processed fruits and vegetables, vegetable carriers of vitamin C. Was irradiated at a given concentration of vitamin C (42.24 mg/100 ml) contained in 3 different media: orange juice in water solution and pure ascorbic acid crystals, then diluted in water, we applied different doses of radiation Gamma (0, 0.1, 1.0, and 10 kGy), the dose rate was 7.433 GY / min.The results showed that higher percentages of vitamin C destruction irradiated to the respective doses were presented in the solution of vitamin C contained in water, (15.62, 64.11 and 84.38%) due to the indirect effect of gamma radiation , then vitamin C contained in orange juice, (5.25, 7.33 and 50.50%) This is because the other constituents of orange juice, have a protective effect of vitamin C against radiation, vitamin C crystals, was the one with the lowest percentages of Destruction (3.13, 4.60 and 6.74%). The different samples showed an initial content of 42.24 mg of vitamin C per 100 ml of the selected substrate. A dose of 0.1 kGy the percentage of destruction in the water solution was 15.62% while in the orange juice and glasses was 5.25% and 3.13% respectively, at a dose of 1 kGy showed the following percentages of destruction solution 64.11; juice crystals and 7.33 respectively 4.60% and the dose of 10 kGy the destruction of vitamin C in solution was 84.38, in orange juice 50.50 % and in crystals 6, 79% demonstrated that the type of substrate and the dose plays an important role in the effects of radiation on vitamin C. In an irradiation facility for quarantine treatment of fruits and vegetables are applied about 0.1 kGy dose, so the vitamin C losses will be minimal.

This study give knowlege about 20 species of plants from Huaraz Province: Acacia macracantha., Alnus acuminata, Ambrosia arborescens, Baccharis latifolia, Barnadesia dombeyana, Caesalpinia spinosa, Cordia lutea., Furcraea andina, Jungia paniculata, Mutisia acuminata, Oreocalis grandiflora, Ophryosporus angustifolius, Polylepis incana, Schinus molle, Senecio elatus, Tecoma sambucifolia., Sambucus peruviana, Verbesina sp, y Baccharis sp.; and one introduced specie Spartium junceum. It was determinated the textural soil by the hidromether method, the pH by the electromether method and the use tradicional of each one. It was found that each one species grow in soils with diferent texture, where the more frecuently were sandy loam and loamy sand, and in the same way the pH can be different.

GB virus C (GBV-C) is a lymphotropic, positive-RNA virus. GBV-C has been found in considerable amounts in healthy blood donors and, in average, it is found in 1.7% of the population. Its transmission is very similar to HIV and HCV i.e. by parental and sexual transmission. The possibility of transmission via breastfeeding has been suggested. GBV-C replicates in mononuclear blood cells, mainly in T (CD4+ and CD8+) and B cells. HIV is a world health problem that until today we don’t have a cure or vaccine. GBV-C and HIV interactions have prove that coinfected patients have slower progression to AIDS and longer survival, in vitro coinfection experiments GBV-C makes a inhibition of HIV replication in the range of 78% – 98%, but there is no description of the specific mechanism of this interaction. In this paper, we propose a mathematical model describing the inhibition of HIV by GBV-C. This model consists of six non-linear differential equations system taking into account healthy cells, cells infected exclusively by HIV or GBV-C, free GBV-C and HIV viral particles and by cells coinfected by GBV-C and HIV. The analysis reveals the existence of four equilibria: one equilibrium free of any infection, another one infected by GBV-C, one HIV infected equilibrium and an equilibrium of coinfected cells. A local stability analysis was carried out as well as numerical simulations with parameter values taken from the literature.

The image analysis is a subject on which much emphasis is being given with purpose of identifying parameters, data, visual features in the image that provide us information about environment, it is represented in the image, but without the intervention of a person. Many methods have been developed with passing of the years, each seeking to minimize the error. The vast majority of implementations of these Facial Recognition Systems have been in a computer and a few have been implemented on hardware. This paper presents a Face Recognition System based on FPGA, The FPGA is configured with the language VHDL, this system is independent of a computer, this will give the system based on FPGA three main advantages, which include fast processing thanks to the ability of the FPGA that can perform parallel processes, and the other two advantages are the size and weight that are important to have more limited applications in weight and size.

Hoy en día, el desarrollo constante de nuevas herramientas informáticas ha hecho posible el mejoramiento de los mecanismos de seguridad y el descubrimiento de muchas de sus vulnerabilidades; lo que obliga a los administradores de red a mejorar sus sistemas continuamente. Por tal motivo, varias organizaciones están implementando modelos con soporte IEEE 802.1X [1] con el objetivo de mejorar la seguridad en cuanto a la autenticación y el registro de los usuarios que acceden diariamente a su red. Para minimizar los problemas en seguridad, existen mecanismos que utilizan un sistema de autenticación en capa 2 del modelo de referencia OSI y basado en el modelo AAA [2], el cual es un estándar implementado en todos los sistemas RADIUS [3] tal como el sistema FreeRADIUS basado en software libre. A su vez, este sistema debería tener un mecanismo para el control de los diversos eventos que ocurren durante los procesos AAA, sin embargo, la versión actual de FreeRADIUS no cuenta con algún soporte de protocolo de gestión como SNMP [4] para que pueda ser monitoreado de manera remota con la integridad y confidencialidad garantizada. En este articulo se presenta la implementación de un sistema de monitoreo que permite obtener reportes de datos estadísticos de un servidor de autenticación RADIUS en forma segura, utilizando SNMPv3 [5] como protocolo de gestión y FreeRADIUS como Servidor RADIUS. Para ello se realizó consultas a los atributos [6] que registran el conteo de los eventos de autenticación en FreeRADIUS. Dichas cifras son almacenadas temporalmente en una Base de Información de Administración (MIB) [7] que un servidor de monitoreo consulta en un intervalo de tiempo constante, utilizando el protocolo SNMPv3. Los datos recogidos, son almacenados en una base de datos MySQL [8] y presentados en gráficos en series de tiempo, utilizando la herramienta RRDTool [9] en una interfaz web. Para validar el funcionamiento, se realizaron pruebas en un escenario LAN con un cliente RADIUS, un servidor FreeRADIUS, 2 usuarios y un servidor de monitoreo. Se hicieron varios intentos de autenticación con usuarios registrados y no registrados para obtener cifras significativas del conteo de eventos durante los procesos de autenticación. La implementación se llevó a cabo utilizando software libre, tanto para el servidor FreeRADIUS como para el20110021 servidor de monitoreo. Además, se consideró el monitoreo de todos los atributos disponibles en FreeRADIUS, a diferencia de otros sistemas propietarios que sólo muestran información limitada [10].