WorldWideScience

Sample records for negatrons spectra espectros

  1. BETA SPECTRA. I. Negatrons spectra; ESPECTROS BETA. I. Espectros simples de negatrones

    Energy Technology Data Exchange (ETDEWEB)

    Grau Malonda, A; Garcia-Torano, E

    1978-07-01

    Using the Fermi theory of beta decay, the beta spectra for 62 negatrons emitters have been computed introducing a correction factor for unique forbidden transitions. These spectra are plotted vs. energy, once normal i sed, and tabulated with the related Fermi functions. The average and median energies are calculated. (Author)

  2. BETA SPECTRA. I. Negatrons spectra

    International Nuclear Information System (INIS)

    Grau Malonda, A.; Garcia-Torano, E.

    1978-01-01

    Using the Fermi theory of beta decay, the beta spectra for 62 negatrons emitters have been computed introducing a correction factor for unique forbidden transitions. These spectra are plotted vs. energy, once normal i sed, and tabulated with the related Fermi functions. The average and median energies are calculated. (Author)

  3. Ballistic negatron battery

    Energy Technology Data Exchange (ETDEWEB)

    Prasad, M.S.R. [Koneru Lakshmiah Univ.. Dept. of Electrical and Electronics Engineering, Green fields, Vaddeswaram (India)

    2012-07-01

    If we consider the Statistics there is drastic increase in dependence of batteries from year to year, due to necessity of power storage equipment at homes, power generating off grid and on grid Wind, PV systems, etc.. Where wind power is leading in renewable sector, there is a need to look at its development. Considering the scenario in India, most of the wind resource areas are far away from grid and the remaining areas which are near to grid are of low wind currents which is of no use connecting these equipment directly to grid. So, there is a need for a power storage utility to be integrated, such as the BNB (Ballistic Negatron Battery). In this situation a country like India need a battery which should be reliable, cheap and which can be industrialized. So this paper presents the concept of working, design, operation, adaptability of a Ballistic Negatron Battery. Unlike present batteries with low energy density, huge size, more weight, more charging time and low resistant to wear level, this Ballistic Negatron Battery comes with, 1) High energy storage capability (many multiples more than the present most advanced battery). 2) Very compact in size. 3) Almost negligible in weight compared to present batteries. 4) Charges with in very less time. 5) Never exhibits a wear level greater than zero. Seems like inconceivable but adoptable with simple physics. This paper will explains in detail the principle, model, design, construction and practical considerations considered in making this battery. (Author)

  4. Reconstruction of neutron spectra through neural networks; Reconstruccion de espectros de neutrones mediante redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H.R.; Hernandez D, V.M.; Manzanares A, E. [Cuerpo Academico de Radiobiologia, Estudios Nucleares, Universidad Autonoma de Zacatecas, A.P. 336, 98000 Zacatecas (Mexico)] e-mail: rvega@cantera.reduaz.mx [and others

    2003-07-01

    A neural network has been used to reconstruct the neutron spectra starting from the counting rates of the detectors of the Bonner sphere spectrophotometric system. A group of 56 neutron spectra was selected to calculate the counting rates that would produce in a Bonner sphere system, with these data and the spectra it was trained the neural network. To prove the performance of the net, 12 spectra were used, 6 were taken of the group used for the training, 3 were obtained of mathematical functions and those other 3 correspond to real spectra. When comparing the original spectra of those reconstructed by the net we find that our net has a poor performance when reconstructing monoenergetic spectra, this attributes it to those characteristic of the spectra used for the training of the neural network, however for the other groups of spectra the results of the net are appropriate with the prospective ones. (Author)

  5. Graphics of diffraction spectra for PC; Graficado de espectros de difraccion para microcomputadora PC

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-09-15

    The materials can be studied by means of diffraction if these are crystalline; of the type of study will depend the technique to apply, the first step is the obtaining of a digital register that allows to build the corresponding spectra. The digital register should have well-known the initial and final angular data. The main objective of this work, is starting of a digital register of data or an arrangement CPSi type (counts per second measured by the detection system) generated by means of the diffractometer, to create the graph of the corresponding spectra in visual form in the screen of a microcomputer and if is required, to obtain the graph in printed form by means of the same computer program for microcomputer. (Author)

  6. Thermal spectra of the TRIGA Mark III reactor; El espectro termico del reactor TRIGA Mark III

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R.; Palacios G, J. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1998-07-01

    The diffraction phenomenon is gave in observance of the well known Bragg law in crystalline materials and this can be performance by mean of X-rays, electrons and neutrons among others, which allows to do inside the field of each one of these techniques the obtaining of measurements focussed at each one of them. For the present work, it will be mentioned only the referring to X-ray and neutron techniques. The X-ray diffraction due to its properties just it does measurements which are known in general as superficial measurements of the sample material but for the properties of the neutrons, this diffraction it explores in volumetric form the sample material. Since the neutron diffraction process depends lots of its intensity, then it is important to know the neutron source spectra that in this case is supplied by the TRIGA Mark III reactor. Within of diffraction techniques a great number of them can be found, however some of the traditional will be mentioned such as the identification of crystalline samples, phases identification and the textures measurement. At present this last technique is founded on the dot of a minimum error and the technique of phases identification performs but not compete with that which is obtained by mean of X-rays due to this last one has a major resolution. (Author)

  7. Indirect measurements of X-ray spectra; Mediciones indirectas de espectros de rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Mainardi, R.T. [Facultad de Matematica, Astronomia y Fisica, Universidad Nacional de Cordoba, X5000HUA Cordoba (Argentina)

    2006-07-01

    To the effects of measuring the spectral distribution of the radiation emitted by the x-ray tubes and electron accelerators, numerous procedures that are grouped in two big categories exist at the present time: direct and indirect methods. The first ones use high resolution detectors that should be positioned, together with the appropriate collimator, in the direction of the x ray beam. The user should be an expert in the use and correction of the obtained data by the different effects that affect the detector operation such as efficiency and resolution in terms of the energy of the detected radiation. The indirect procedures, although its are more simple to use, its also require a considerable space along the beam to position the ionization chamber and the necessary absorbents to construct by this way the denominated attenuation curve. We will analyze the operation principle of the indirect methods and a new proposal in which such important novelties are introduced as the beam dispersion to avoid to measure along the main beam and that of determination of the attenuation curve in simultaneous form. By this way, with a single shot of the tube, the attenuation curve is measured, being necessary at most a shot of additional calibration to know the relative response of the detectors used in the experimental array. The physical processes involved in the obtaining of an attenuation curve are very well well-known and this it finishes it can be theoretically calculated if the analytic form of the spectrum is supposed well-known. Finally, we will see a spectra reconstruction example with the Kramers parametric form and comparisons with numeric simulations carried out with broadly validated programs as well as the possibility of the use of solid state dosemeters in the obtention of the attenuation curve. (Author)

  8. Gamma spectra pictures using a digital plotter. Program MONO; Representacion de Espectros directos mediante un trazado digital. Prograa MONO

    Energy Technology Data Exchange (ETDEWEB)

    Los Arcos, J M

    1978-07-01

    The program MONO has been written for a CALCOMP-936 digital plotter operating off- -line with a UMI VAC 1106 computer, to obtain graphic representations of single gamma spectra stored on magnetic tape. It allows to plot the whole spectrum or only a part, as well as to draw a given spectrum on the same or different picture than the previous one. Ten representation scales are available and at up nine comment lines can be written in a graphic. (Author) 4 refs.

  9. ESPECTROS INFRAVERMELHOS DA CREATINA

    Directory of Open Access Journals (Sweden)

    Kumiko K. Sakane

    2011-08-01

    Full Text Available São apresentados espectros infravermelhos da creatina, na faixa de 4000 a 400 cm−1. Os resultados são comparados com espectros observados e calculados, publicados na literatura.

  10. Indirect measure of X-rays spectra using TLDs; Medicion indirecta de espectros de rayos X utilizando TLDs

    Energy Technology Data Exchange (ETDEWEB)

    Bonzi, E. V.; Mainardi, R. T. [Universidad Nacional de Cordoba, Facultad de Matematica, Astronomia y Fisica, Av. Haya de la Torre y Av. Medina Allende s/n, Ciudad Universitaria, X5016LEA Cordoba (Argentina)

    2011-10-15

    A methodology of indirect measure of X-rays spectra, emitted by conventional tubes, was developed recently and its feasibility verified in the first place by Monte Carlo simulations. For that case is intended to measure, by means of plastic scintillators, attenuation curves of dispersed beams previously. In this work were carried out measurements of attenuation curves with thermoluminescent dosimeters (TLD) to verify the kindness of the indirect measure method. The attenuation curve was also measured using an ionization chamber brand Capintec (model 192) with the purpose of making a comparison. The results of the attenuation curve measured with both dosimeters present a good resolution inside the statistical fluctuations and the spectral reconstruction using diverse parametric functions is carried out in a quick and simple way with excellent resolutions in the functional form. For this reconstruction method are of fundamental importance the following properties of the used dosimeter: in the first place the repetition of the measures, property that could check; in second place the precision of the measured data and lastly the dosimeter response, this is, the increase of the thermoluminescent signal before an increase of the photons flow of X-rays. This parameter is the gradient of the curve thermoluminescent signal versus the dose imparted to the dosimeter. The measures were realized with a generator of X-rays brand Kevex provided of a conventional tube with tungsten anti cathode that polarizes with high tension to a maximum value of 50 kV and current of 0.5 ma. (Author)

  11. Some Measurements of Thermal Neutron Spectra; Mesure de Spectres de Neutrons Thermiques; Nekotorye izmereniya spektrov teplovykh nejtronov; Algunas Mediciones de Espectros de Neutrones Termicos

    Energy Technology Data Exchange (ETDEWEB)

    Poole, M. J.; Schofield, P.; Sinclair, R. N. [United Kingdom Atomic Energy Authority, Research Group, Atomic Energy Research Establishment, Harwell (United Kingdom)

    1964-04-15

    Complementary programmes to determine moderator scattering law and to test its validity through spectrum measurements have been initiated at Harwell. The scattering-law experiments have been largely carried out at Chalk River, while the data processing is done at the Argonne National Laboratory and the analysis and necessary extrapolation from the measurements performed at Harwell. The spectrum measurements fall naturally into two parts. Using time-of-flight spectroscopy a wide range of measurements has been made of thermal neutron spectra in homogeneous poisoned moderators. This work parallels and extends the earlier work of the author and of Beyster et al. and serves to check the validity of energy transfer cross-sections o(E -> E) derived from the scattering law in use. However such an experiment is completely insensitive to the angular dependence of scattering and to that part of the scattering cross-section involving no energy change of the scattered neutron, both of which are important in any spatially dependent problem. Accordingly other experiments have been undertaken in which spatial or thermal discontinuities were deliberately introduced to make the spectrum depend on the complete scattering law. The first such is the so-called ''two block experiment'' in which thermal neutrons are allowed to diffuse from a block of graphite at room temperature into a second block whose temperature may be raised to 400 Degree-Sign C. Neutron spectra are measured at various positions near to the temperature discontinuity by extracting a beam of neutrons from each position and passing this into a chopper time-of-flight spectrometer. As a preliminary analysis ''rethermalization cross-sections'' have been derived from the experiment which may be compared with those of Bennet et al. who perfomved a similar experiment using energy sensitive detectors. In order to obtain a more detailed comparison, multigroup diffusion-theory calculations are being carried out, using the Chalk

  12. Espectro de gotas de pontas de pulverização com adjuvantes de uso agrícola Droplet spectra of spray nozzles with agricultural adjuvants

    Directory of Open Access Journals (Sweden)

    J.P.A.R. Cunha

    2010-01-01

    Full Text Available O sucesso de uma boa aplicação de produtos fitossanitários depende da sinergia entre fatores como tamanho de gota, tipo de ponta, pressão, volume e composição da calda e características do alvo. Assim, o objetivo deste trabalho foi avaliar o espectro de gotas produzidas por pontas de jato plano defletor (TT 11002 e jato plano defletor com indução de ar (TTI 11002, com diferentes adjuvantes adicionados à calda de pulverização, pela técnica de difração de raio laser. O experimento foi conduzido em delineamento inteiramente casualizado, com quatro repetições, em esquema fatorial 2 x 5, ou seja, duas pontas de aplicação (jato plano defletor e jato plano defletor com indução de ar e cinco composições de calda (água e água mais quatro adjuvantes: fosfatidilcoline+ácido propiônico, éter poliglicólico de monilfenol, ésteres de ácidos graxos e nonil-fenol etoxilado+óxido de etileno. Em ambiente controlado, avaliou-se o espectro de gotas, por meio de um analisador a laser de gotas em tempo real, na pressão de 276 kPa. O efeito dos adjuvantes no espectro de gotas mostrou-se dependente da ponta de pulverização empregada. A adição dos adjuvantes à calda não alterou o risco potencial de deriva, expresso pela porcentagem do volume em gotas com diâmetro inferior a 100 µm, porém o adjuvante fosfatidilcoline+ácido propiônico reduziu o diâmetro da mediana volumétrica das gotas produzidas pela ponta de jato plano defletor com indução de ar, em relação à avaliação feita somente com água.The success of an efficient pesticide application depends on the synergy among factors such as droplet size, nozzle type, pressure, spray volume, spray tank mixture and target. The aim of this work was to evaluate the spectrum of droplets produced by turbo flat-fan (TT 11002 and air induction turbo flat-fan (TTI 11002 spray nozzles, with different adjuvants added to the tank mix, using the laser diffraction technique. The

  13. Espectros de duas formas de lignina obtidos por ressonância magnética nuclear Nuclear magnetic resonance spectra of two types of lignin

    Directory of Open Access Journals (Sweden)

    Romualdo Shigueo Fukushima

    2003-04-01

    Full Text Available O conteúdo de lignina pode ser útil na estimativa da digestão da fibra de plantas forrageiras. A determinação quantitativa da lignina pelo método espectrofotométrico pressupõe a existência de um padrão de referência satisfatório. O objetivo deste trabalho foi avaliar, por meio da ressonância magnética nuclear (RMN, duas ligninas, uma extraída com brometo de acetila (LBrAc e outra com solução ácida de dioxano (LDiox, para utilização como padrão de referência em análises espectrofotométricas. A ressonância de próton acusou altos teores de carboidratos contaminantes nas amostras de LBrAc. Como a cromatografia líquida já havia indicado menor presença de carboidratos contaminantes na LDiox, os espectros por ressonância de carbono, mais rica em detalhes do que a espectroscopia anterior, porém mais demorada, foram realizados somente nas ligninas LDiox. Este espectro revelou picos típicos, comuns à maioria das ligninas. Os achados da RMN foram condizentes com a análise química, a qual identificou que o carboidrato da parede celular que acompanha a LBrAc seria possivelmente a celulose, ao passo que a pequena contaminação da LDiox teria origem nas pentosanas. A LDiox pode ser considerada melhor padrão de referência para as análises espectrofotométricas do que a LBrAc.Lignin content can be useful to estimate fiber digestion of forage plants. Quantitative determination of lignin by the spectrophotometric method presumes an efficient standard. The objective of this work was to evaluate, by the nuclear magnetic resonance (NMR, two lignins, one extracted with acetyl bromide (AcBrL and another with acidic dioxane solution (DL, as standards in spectrophotometric analysis. Proton resonance revealed high presence of carbohydrates in the AcBrL residues. Because liquid chromatograph had already shown low contamination with carbohydrates in the DL samples, only carbon resonance, which is lengthier, but richer in details than

  14. Espectros biológicos florísticos de Campos Rupestres de afloramento e Campos Úmidos diferem entre si e em relação ao Espectro Biológico Normal de Raunkiaer. Floristic biological spectra of Rock outcrops and Wet grasslands differ between themselves and in relation to the Raunkiaer’s Normal Biological Spectrum.

    Directory of Open Access Journals (Sweden)

    Natalia de Oliveira COSTA

    2012-12-01

    Full Text Available A distribuição de frequência de classes de formas de vida em uma flora, conhecida como espectro biológico florístico, varia em função das condições climáticas e edáficas em que as plantas se desenvolvem. Neste trabalho comparamos os espectros biológicos médios (n = 3 de equivalentes a Campo Rupestre de afloramento e a Campo Úmido no Estado de São Paulo na expectativa de encontrar diferenças significativas entre os dois tipos de comunidade. Os Campos Rupestres (G-corrigido = 23,41; p-valor = 0,0001 e os Campos Úmidos (G-corrigido = 80,34; p < 0,0001 diferiram do Espectro Biológico Normal de Raunkiaer, bem como diferenciaram-se entre si (χ2 = 24,23; p < 0,0001. Uma Análise de Correspondência Distendida separou Campos Rupestres de Campos Úmidos devido às maiores frequências de fanerófitos nos primeiros e de hemicriptófitos e terófitos nos últimos. Sugerimos como hipóteses que os micro-habitats favoráveis ao desenvolvimentode fanerófitos sejam mais comuns nos Campos Rupestres de afloramento do que nos Campos Úmidos, ocorrendo o contrário com os micro-habitats favoráveis aos hemicriptófitos. Esta forma de vida pode apresentar melhor ajustamento ao encharcamento do solo do que os caméfitos e geófitos. A estratégia de escape apresentada pelos terófitos seria pouco eficiente em Campos Rupestres de afloramento devido à escassez de solo para proteção das sementes. The frequency distribution of life forms in a flora, called floristic biological spectrum, varies according to the climatic and edaphic conditions under which plants grow. In this work we compared the average (n = 3 biological spectra of Rock outcrop and Wet grassland like communities in São Paulo state expecting to find significant differences between the two community types. Rock outcrops (G-corrected = 23.41; p-value = 0.0001 and Wet grasslands (G-corrected = 80.34; p < 0.0001 differed from the Raunkiaer’s Normal Biological Spectrum, as did between

  15. DELIN and DELOG codes for graphic representation of gamma ray spectra; Programas DELIN y DELOG para la representacion grafica de espectros gamma

    Energy Technology Data Exchange (ETDEWEB)

    Romero, L; Travesi, A

    1983-07-01

    Two Fortran IV Codes has been developed for graphic representation of the gamma-ray spectra obtained with Ge Li detectors and multichannel analyzers. The grafic plotting es carried out with the H.P. Graphic Plotter Mod HP-7221 A, using the graphic package software GRAPHICS-1000 from Hewlett-Packard. The codes have a great versatility and the representation of gamma spectra can ba done in a lineal, semi log, or log-log scale, as desired. The gamma ray spectra data are feed into the computer through magnetic tape or perfored paper tape. The different out-put options and complementary data are given in a conversational way through a terminal with T.V. displays. Among the options that can be selected by the user are the following: - smoothing the spectra - drawing the spectra point by point or continuous - out-put drawing an 1, 2, or 4 sheet with automatic division of the energy scale. - overlapping of selected spectra regions in Y scale ampliation with automatic print-out of the region limits and ampliation factor. - Printing spectra data and identifications of selected photo peaks. The codes can be employed with any computer using printing devices, HP-Graphics 1000 software compatible, but are easily modified for another printing software since their modular structure with Fortran IV written.

  16. Determination of the fast neutrons spectra by the Elastic scattering method (n, p); Determinacion del espectro de neutrones rapidos por el metodo de la dispersion elastica (n, p)

    Energy Technology Data Exchange (ETDEWEB)

    Elizalde D, J

    1973-07-01

    This work consists in determining the fast neutron spectra emitted by a Pu-Be isotopic source. The implemented technique is based in the spectrometry (n, p). This consists in making to fall on a fast neutrons beams (polyenergetic) over a thin film of hydrogenated material, detecting the spectra of emitted protons at a fix angle. The polyethylene film and the used solid state detector are inside of a vacuum chamber. The detector is placed at 30 degree with respect to direction of the incident neutrons beam. The protons spectra is stored in a multichannel. the energy is obtained with the prior calibration of the system. The data processing involves the transformation of the protons spectra observed at the falling on neutrons spectra over the film. The energy of the neutrons is related with that of the protons, according to the collision kinematical equations. The cross section of elastic collision of the neutrons with the hydrogen atoms is obtained from literature. Applying these relations to the observed spectra it is obtained the falling on neutron spectra over the film. (Author)

  17. Program LEP to addition of gamma spectra from germanium detectors; Programa LEPS para suma de espectros gammas de detectores de germanio

    Energy Technology Data Exchange (ETDEWEB)

    Romero, L

    1986-07-01

    The LEP program, written in FORTRAN IV, performs the addition of two spectra, collected with different detectors, from the same sample. This application, adds the two gamma spectra obtained from two opposite LEPS Germanium Detectors (Low Energy Photon Spectrometer), correcting the differences (channel/energy) between both two spectra, and fitting them before adding. The total-spectrum is recorded at the computer memory as a single spectrum. The necessary equipment, to run this program is: - Two opposite germanium detectors, with their associate electronics. - Multichannel analyzer (2048 memory channel minimum) - Computer on-line interfacing to multichannel analyzer. (Author) 4 refs.

  18. Automatic storing of single gamma spectra on magnetic tape. Programs LONGO, DIRE; Automatizacion del almacenamiento en cinta magnetica de espectros gamma directos. Programas LONGO, DIRE

    Energy Technology Data Exchange (ETDEWEB)

    Los Arcos Merino, J M

    1978-07-01

    The program LONGO provides the block size and the block number in a binary file on magnetic tape. It has been applied to analyse the structure of the nine-track magnetic tapes storing single or coincidence gamma spectra files, recorded in octet form by a MULTI-8 minicomputer in the Nuclear Spectrometry Laboratory of J.E.N. Then the program DIRE has been written to transform the single gamma spectra into a new FASTRAND disk file, storing the information in-36 bit words. A copy of this file is obtained on magnetic tape and the single gamma spectra are then available by standard FORTRAN V reading sentences. (Author) 3 refs.

  19. Application of Wavelets and Quaternions to NIR Spectra Classification; Aplicacion de las Wavelests y los Cuaterniones a la Clasificaciond e Espectros NIR

    Energy Technology Data Exchange (ETDEWEB)

    Barcala Riveira, J. M.; Fernandez Marron, J. L.; Alberdi Primicia, J.; Navarrete Marin, J. J.; Oller Gonzalez, J.C.

    2003-07-01

    This document describes how multi resolution analysis can combine with the use of quaternions to identify near infrared spectra. The method is applied to spectra of plastics usually present in domestic wastes. First, Haar wavelet is applied to spectrum. With the coefficients obtained, a quaternion is built. We named this quaternion a characteristic quaternion. Distances to characteristic quaternions are used to classify new quaternions. (Author) 54 refs.

  20. Mathematical treatment of digitalized spectra of the neutron diffractometer for microcomputer; Tratamiento matematico de espectros digitalizados del difractometro de neutrones para microcomputadora

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L R

    1991-06-15

    For the study of materials by means of diffraction, it is required in the first place that the sample is a crystalline material so that the diffraction is possible and the digitized spectra of corresponding diffraction can be generated. This spectra, for any type of study consists of a great number of readings (counting or counts per second Cps) that of some way are related to a determined angle to be able to reproduce a diagram that will be evaluated to conclude the study according to it is. Since the evaluation will depend on the angular readings that are carried out in the mentioned spectra, it is required of a good definition of the curves for its angular reading. Well-known the problem of the no enough definition of the spectra to be able to carry out the angular reading, it was proceeds to outline a possible solution which consists on making a mathematical treatment to the spectra with the purpose of being able to define the angular positions of interest and to correct some operation factors that appear in the spectra. (Author)

  1. Determination of interplanar distances starting from diffraction spectra for PC microcomputer; Determinacion de distancias interplanares a partir de espectros de difraccion para microcomputadora PC

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-07-15

    The objective of this work, consists in that starting of a digitized diffraction spectra result of the structural analysis technique, it is possible by means of the analysis of a computer program, to detect the diffraction peaks and well-known the wavelength to obtain the values of the interplanar distances to be compared with the JCPDS (Joint Committee on Powder Diffraction Standards). (Author)

  2. Photons and photoneutrons spectra of a Linac of 15 MV; Espectros de fotones y fotoneutrones de un LINAC de 15 MV

    Energy Technology Data Exchange (ETDEWEB)

    Benites R, J. L.; Carrillo C, A. [Centro Estatal de Cancerologia de Nayarit, Av. Enfermeria, Fracc. Fray Junipero Serra, 63000 Tepic, Nayarit (Mexico); Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Velazquez F, J. B., E-mail: jlbenitesr@prodigy.net.mx [Universidad Autonoma de Nayarit, Posgrado CBAP, Carretera Tepic Compostela Km. 9, Xalisco, Nayarit (Mexico)

    2011-10-15

    Using the Monte Carlo code MCNP-5, the photons and photoneutrons spectra generated in the head stock of the lineal accelerator (Linac) Varian of 15 MV of the Cancerology State of Nayarit were determined. For the calculations a heterogeneous head stock was modeled, more compatible with the work conditions. In the center of the head stock a tungsten target was located on a copper support, followed by the flattened filter. The photons and photoneutrons spectra were obtained accelerating electrons and making them collide against the target to produce photons by Bremsstrahlung, these photons were transported inside the head stock and the photons and photoneutrons spectra were calculated in a punctual detector located under the flattened filter and in the isocenter. The spectra were evaluated in punctual detectors that were located in the plane from the isocenter to the long of the X and Y axes each 20 cm, in an equidistant way, up to 2 m, so much in the longitudinal and transversal axes. In the calculations were used histories 5E(6) with the purpose of obtaining smaller uncertainties to 1%. It was found that the photons spectrum in the punctual detector inside the head stock presents a pick of 1.25 MeV in the energy interval of 0.5 and 1.5 MeV, later suffers a filtration and diminishes in asymptote form. This spectrum modifies when the beam reaches the isocenter, diminishing the low energy photons. Inside the head stock the photoneutrons spectrum shows a structure with two picks, one before 1 MeV and other after 1 MeV; this is for effect of the collimators geometry and the distance. Finally an increment of the total neutrons flow to 60 cm of distance of the isocenter on the Y axis was observed, due to the design geometry of the modeling heterogeneous head stock. (Author)

  3. Experimental study of the X-ray spectra optimization for computed radiography mammography systems; Investigacao experimental da otimizacao do espectro de raios X em sistemas de mamografia computadorizada

    Energy Technology Data Exchange (ETDEWEB)

    Tomal, Alessandra, E-mail: atomal@ifi.unicamp.br [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Instituto de Fisica Gleb Wataghin; Cunha, Diego M. [Universidade Federal de Uberlandia (UFU), Uberlandia, MG (Brazil). Instituto de Fisica; Nogueira, Maria S. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Gaspar, Fabio [Vigilancia Sanitaria, Campinas, SP (Brazil); Poletti, Martin E. [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil). Faculdade de Filosofia, Ciencias e Letras. Departamento de Fisica

    2013-12-15

    Digital mammography is replacing screen-film mammography due to several advantages of digital receptors. The use of Computed Radiography (CR) mammography systems has been considered an alternative to achieve digital images with a low cost. Besides, the optimization of the X-ray spectrum, characterized by the anode/filter combination and tube potential, is an important step in order to improve the image quality with the lower dose to the breast. In this work, we investigated the optimal X-ray spectra using a figure of merit for two mammography equipment: Senographe DMR (General Electric Medical Systems) and Mammomat 3000 Nova (Siemens), both using an image plate Kodak EHR-M2 (Kodak DirectView). A PMMA phantom, simulating breast with thicknesses of 5 cm, was used. The anode/filter combinations evaluated were: Mo/Mo, Mo/Rh, Rh/Rh and Rh/Al for the Senographe system, and Mo/Mo, Mo/Rh, W/Rh for the Mammomat system, for all the intervals of tube potential range from 24 to 35 kVp. Results demonstrate that the higher values of FOM were achieved with the Rh/Rh at 29 kVp and Rh/Al at 26 kVp for the Senographe system, and for the W/Rh at 28 kVp in the Mammomat one. The reduction in the dose associated with the optimum spectra was 13 and 26% for the Senographe and Mammomat systems, respectively. Finally, our results suggest that anode/filter combinations of more energetic spectra than the standard Mo/Mo combination are recommended for thicker breast, in order to reduce the breast dose levels. (author)

  4. Neutron reference spectra measurements with the Bonner multi-spheres spectrometer; Medidas de espectros de referencia de neutrons com o espectrometro de multiesferas de Bonner

    Energy Technology Data Exchange (ETDEWEB)

    Lemos Junior, Roberto Mendonca de

    2004-07-01

    This paper aims to define a procedure to use the Bonner Multisphere Spectrometer with a {sup 6}LiI(Eu) detector in order to determine of neutron spectra. It was measured {sup 238}PuBe spectra and same of reference ({sup 241}AmBe, {sup 252}Cf e {sup 252}Cf+D{sub 2}O) published in ISO 8529-1 (2001) Norm. The data were processed by a computer program (BUNKI), which presents the results in neutrons energy fluency. Each input parameter of the program was studied in order to establish their influence in the adjustment result. The environment dose equivalent rate obtained placing the detector 1 m from the {sup 241}AmBe source was 122 {+-} 4 {mu}Sv/h with 7% of uncertainty and 95% of confidence level. The procedure established in this work was tested with the {sup 238}PuBe spectrum, obtaining an environment dose equivalent rate of 286 {+-} 9 {mu}Sv/h, 8% lower than the value measured experimentally used as reference. Through this procedure will be possible to measure neutron spectra in different work places where neutrons sources are used. Knowing these spectra, it will be possible to evaluate which area monitors, are more suitable, as well as, to study better the response of individual neutron monitors, as for instance, to obtain a conversion coefficient more appropriate to the albedo dosimeter used in different work places. As the measurements need a long time to be accomplished, the work optimization is fundamental to reduce the exposing time of the Bonner spectrometer operator. For this reason, an important parameter examined in this paper was the possibility of reducing the number of spheres used during the measurement without changing the final result. Considering the radiation protection standards, this parameter has a huge importance when the measurements are performed in work places where the neutron fluency and gamma rate offer risks to the operator's health, as for instance, in nuclear centrals. Studying this parameter, it was possible to conclude that

  5. Espectro Vibracional no Infravermelho Próximo dos Polímeros Poliestireno, Poli(Metacrilato de Metila e Policarbonato Near-Infrared Spectra of Polystyrene, Poly(Methyl Methacrylate and Polycarbonate

    Directory of Open Access Journals (Sweden)

    Sérgio C. de Araújo

    2001-01-01

    Full Text Available Os espectros no infravermelho próximo (NIR dos polímeros amorfos poliestireno (PS, poli(metacrilato de metila (PMMA e policarbonato (PC foram estudados. A tentativa de atribuição das bandas harmônicas e de combinação dos modos vibracionais do PS, PMMA e PC foi realizada baseando-se na teoria de modos locais e pelo uso do método matemático de ajuste de curvas. A correção de anarmonicidade e freqüência mecânica foi determinada em um gráfico de Birge-Sponer. Uma correção de anarmonicidade de 57 e 58 cm-1 foi obtida para os modos de estiramento dos grupos CH2 e CH do PS; 59 e 9 cm-1 para os modos de estiramento dos grupos CH3 e CO do PMMA e 53, 59 e 10 cm-1 para os modos de estiramento dos grupos CH, CH3 e CO do PC, respectivamente.The near-infrared (NIR spectra of the amorphous polymers polystyrene (PS, poly(methyl methacrylate (PMMA, and polycarbonate (PC have been studied. The tentative assignment of the overtone and combination frequencies is made using the curve fitting calculations and the local mode theory. Anharmonicity correction and mechanical frequency were determined from a Birge-Sponer plot. A tentative assignment of stretch overtone frequency of CH2 and CH functional groups of PS; CH3 and CO functional groups of PMMA and CH, CH3 and CO functional groups of PC has been made. An anharmonicity correction of 57 and 58 cm-1 was obtained for CH2 and CH stretch modes of PS; 59 and 9 cm-1 for CH3 and CO stretch modes of PMMA and 53, 59 and 10 cm-1 for CH, CH3 and CO stretch modes of PC, respectively.

  6. El Espectro de Rayos X

    OpenAIRE

    González Marhuenda, Pedro

    2017-01-01

    Este vídeo tiene como objetivo el estudio del espectro de rayos X, es decir, el análisis de la intensidad de rayos X, producidos mediante el frenado de electrones por un material, para cada longitud de onda. Se comienza con el desarrollo histórico que condujo al descubrimiento de los rayos X y al conocimiento de su naturaleza electromagnética.A continuación se explica detalladamente el montaje experimental que permite la medida del espectro de rayos X y se analizan los procesos físicos que da...

  7. Comparison of spectra for validation of Penelope code for the energy range used in mammography; Comparacao de espectros para validacao do codigo PENELOPE para faixa de energia usada em mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Albuquerque, M.A.G.; Ferreira, N.M.P.D., E-mail: malbuqueque@hotmail.co [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil); Pires, E.; Ganizeu, M.D.; Almeida, C.E. de, E-mail: marianogd@uol.com.b [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil); Prizio, R.; Peixoto, J.G., E-mail: guilherm@ird.gov.b [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil)

    2009-07-01

    The spectra simulated by the Penelope code were compared with the spectra experimentally obtained through the silicon PIN photodiode detector, and with spectra calculated by the code of IPEN, and the comparison exhibited a concordance of 93.3 %, and make them an option for study of X-ray spectroscopy in the voltage range used in mammography

  8. Parallel of semi-empirical results simulated by MCNP of X-ray spectra with a semiconductor; Paralelo de resultado semi- empiricos simulados por MCNPX de espectros de raios-X com um semicondutor

    Energy Technology Data Exchange (ETDEWEB)

    Santos, L.R.; Vivolo, V.; Potiens, M.P.A., E-mail: dossantos.lucasrodrigues@gmail.com [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Navarro, M.V.T.; Santos, W.S. [Universidade Federal de Uberlandia (INFIS/UFU), MG (Brazil). Instituto de Fisica

    2016-07-01

    The aim of this study was to use the MCNPX radiation transport code to simulate X-ray spectra generated by a constant voltage system in a CdTe semiconductor detector. As part of the validation process, we obtained a series of experimental spectra. Comparatively, in all cases there is a good correlation between the two spectra. There were no statistically significant differences between the experimental results with the simulated. (author)

  9. El espectro que soy yo

    Directory of Open Access Journals (Sweden)

    Carlos Araque Osorio

    2013-04-01

    Full Text Available “El espectro que soy yo” es una mirada incompleta de mi vida en la ciudad, la universidad y elarte, es decir, de un cúmulo de acontecimientos fraccionados que dicen muy poco de los sucesos,pero me permiten hacer un dibujo de lo que soy y seré. No podemos saber si lo que recordamoscomo cierto ocurrió tal como nos llegan las imágenes mentales. Hacemos versiones y estaspueden ser tergiversaciones. Cada vez que relatamos algo que nos pasó lo hacemos de maneradiferente, le agregamos o le quitamos. Los humanos tenemos la condición y la capacidad defabular con nuestra existencia. Si es imposible contar una historia enteramente veraz, no estámal regocijarnos con la posibilidad de que cada uno haga su propia adaptación de los hechos.

  10. Study of proton and carbon 13 nuclear magnetic resonance spectra of an allyl phenol derivatives series; Estudo de espectros de ressonancia magnetica nuclear protonica e de carbono 13 de uma serie de derivados de alilfenois

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Thais Horta Alvares da [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Faculdade de Farmacia. Dept. de Produtos Farmaceuticos; Oliveira, Alaide Braga de [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Dept. de Quimica

    1991-12-31

    Quaternary ammonium salt derivates of natural ally phenols were synthesized with the purpose of obtaining peripheral analgesics. Eugenol, O-methyleugenol and safrole were submitted to nitration, reduction, per methylation. The amines were also transformed into their hydro chlorides. The {sup 1} HNMR spectra of the nitro compounds, amines, amine hydro chlorides, quaternary ammonium salts and dymethylamines were analysed, as well as the {sup 13} C NMR spectra of the nitro compounds and of the quaternary ammonium salts. (author). 8 refs., 4 tabs.

  11. Composição florística e espectro biológico na Estação Ecológica de Santa Bárbara, estado de São Paulo, Brasil Floristic composition and biological spectra in Santa Barbara Ecological Station, Brazil

    Directory of Open Access Journals (Sweden)

    João Augusto Alves Meira Neto

    2007-10-01

    Full Text Available O conhecimento da flora herbáceo-subarbustiva, juntamente com o da flora lenhosa, auxilia a determinação dos padrões florísticos e permite descrever o espectro biológico com conseqüentes inferências sobre a atua��ão de fatores ambientais e históricos na vegetação. Considerando que poucos trabalhos se aprofundaram no estudo da flora herbáceo-subarbustiva de Cerrado, embora esta seja mais rica que a lenhosa, objetivou-se estudar a composição e os padrões florísticos das floras herbáceo-subarbustiva e lenhosa da Estação Ecológica de Santa Bárbara (EESB (22º 46' 30'' a 22º 50' 30''S e 49º 10' 30'' a 49º15'30'' W , 600 a 680 m de altitude, Município de Águas de Santa Bárbara, Estado de São Paulo. Visou-se, ainda, determinar o espectro biológico para efetuar análises comparativas das diferentes fitofisionomias de Cerrado dessa Unidade de Conservação. Foram encontradas 314 espécies na EESB, sendo 285 em Cerrado sensu lato. As famílias mais ricas em número de espécies foram Asteraceae, Leguminosae, Myrtaceae e Poaceae. Há uma constante ocorrência de Asteraceae, Leguminosae e Poaceae entre as famílias mais ricas, concordando com o observado nos estudos florísticos de Cerrado que incluíram os estratos lenhoso e herbáceo-subarbustivo. O espectro biológico corroborou os padrões anteriormente descritos para o Cerrado sensu lato, exceto pela maior expressão de caméfitas em relação às hemicriptófitas nas fisionomias campestres da EESB, o que pode ser efeito da proteção ao fogo nessa Unidade de Conservação.Only few surveys were carried out on woody and ground layer floras of the Brazilian Cerrado. The objective of this survey was to investigate richness, floristic patterns and biological spectra of different phytophysiognomies on both strata at Santa Bárbara Ecological Station (EESB. EESB is located in the Municipality of Águas de Santa Bárbara, São Paulo State, Brazil (22º 46' 30'' to 22º 50' 30

  12. Spectra and depth-dose deposition in a polymethylmethacrylate breast phantom obtained by experimental and Monte Carlo method; Espectros e deposicao de dose em profundidade em phantom de mama de polimetilmetacrilato: obtencao experimental e por metodo de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    David, Mariano G.; Pires, Evandro J.; Magalhaes, Luis A.; Almeida, Carlos E. de; Alves, Carlos F.E., E-mail: marianogd08@gmail.com [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil). Lab. Ciencias Radiologicas; Albuquerque, Marcos A. [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), RJ (Brazil). Instituto Alberto Luiz Coimbra; Bernal, Mario A. [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Instituto de Fisica Gleb Wataghin; Peixoto, Jose G. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2012-08-15

    This paper focuses on the obtainment, using experimental and Monte Carlo-simulated (MMC) methods, of the photon spectra at various depths and depth-dose deposition curves for x-rays beams used in mammography, obtained on a polymethylmethacrylate (PMMA) breast phantom. Spectra were obtained for 28 and 30 kV quality-beams and the corresponding average energy values (Emed) were calculated. For the experimental acquisition was used a Si-PIN photodiode spectrometer and for the MMC simulations the PENELOPE code was employed. The simulated and the experimental spectra show a very good agreement, which was corroborated by the low differences found between the Emed values. An increase in the Emed values and a strong attenuation of the beam through the depth of the PMMA phantom was also observed. (author)

  13. Reconstruction of neutron spectra using neural networks starting from the Bonner spheres spectrometric system; Reconstruccion de espectros de neutrones usando redes neuronales a partir del sistema espectrometrico de esferas de Bonner

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz R, J.M.; Martinez B, M.R.; Arteaga A, T.; Vega C, H.R.; Hernandez D, V.M.; Manzanares A, E. [Universidad Autonoma de Zacatecas, A.P. 336, 98000 Zacatecas (Mexico)

    2005-07-01

    The artificial neural networks (RN) have been used successfully to solve a wide variety of problems. However to determine an appropriate set of values of the structural parameters and of learning of these, it continues being even a difficult task. Contrary to previous works, here a set of neural networks is designed to reconstruct neutron spectra starting from the counting rates coming from the detectors of the Bonner spheres system, using a systematic and experimental strategy for the robust design of multilayer neural networks of the feed forward type of inverse propagation. The robust design is formulated as a design problem of Taguchi parameters. It was selected a set of 53 neutron spectra, compiled by the International Atomic Energy Agency, the counting rates were calculated that would take place in a Bonner spheres system, the set was arranged according to the wave form of those spectra. With these data and applying the Taguchi methodology to determine the best parameters of the network topology, it was trained and it proved the same one with the spectra. (Author)

  14. Construction of a catalog of X-ray spectra for mammography simulations; Construção de um catálogo de espectros de raios X para simulações em mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Santos, L.C.S.; Vieira, J.W., E-mail: larissa.css@outlook.com [Instituto Federal de Pernambuco (IFPE), Recife, PE (Brazil). Dept. Acadêmico de Ambiente, Saúde e Segurança; Lima, F.R.A., E-mail: falima@cnen.gov.br [Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife-PE (Brazil)

    2017-07-01

    Computational Exposure Models (MCEs) allow the simulation of the interaction of radiation with matter by means of Monte Carlo (MC) techniques. Generally, MCEs are composed of phantom, simulator algorithms of radioactive sources and an MC code to simulate the transport, interaction of the radiation with matter and to evaluate the energy deposited in regions of interest. To compose an MCE for simulations in mammography, the construction of a catalog of X-ray spectra was started, based on the catalog model constructed and using until then in MCEs by the Group of Research in Numerical Dosimetry and by the Group of Research in Computational Dosimetry & Embedded Systems (both referenced in this work as GDN). Potential of 25 kV and 35 kV and used target / filter were applied to the tube: Mo / Mo. The file containing the spectra was read correctly by EGSnrc.

  15. Reconstruction of X-rays spectra of clinical linear accelerators using the generalized simulated annealing method; Reconstrucao de espectros de raios-X de aceleradores lineares clinicos usando o metodo de recozimento simulado generalizado

    Energy Technology Data Exchange (ETDEWEB)

    Manrique, John Peter O.; Costa, Alessandro M., E-mail: johnp067@usp.br, E-mail: amcosta@usp.br [Universidade de Sao Paulo (USP), Ribeirao Preto, SP (Brazil)

    2016-07-01

    The spectral distribution of megavoltage X-rays used in radiotherapy departments is a fundamental quantity from which, in principle, all relevant information required for radiotherapy treatments can be determined. To calculate the dose delivered to the patient who make radiation therapy, are used treatment planning systems (TPS), which make use of convolution and superposition algorithms and which requires prior knowledge of the photon fluence spectrum to perform the calculation of three-dimensional doses and thus ensure better accuracy in the tumor control probabilities preserving the normal tissue complication probabilities low. In this work we have obtained the photon fluence spectrum of X-ray of the SIEMENS ONCOR linear accelerator of 6 MV, using an character-inverse method to the reconstruction of the spectra of photons from transmission curves measured for different thicknesses of aluminum; the method used for reconstruction of the spectra is a stochastic technique known as generalized simulated annealing (GSA), based on the work of quasi-equilibrium statistic of Tsallis. For the validation of the reconstructed spectra we calculated the curve of percentage depth dose (PDD) for energy of 6 MV, using Monte Carlo simulation with Penelope code, and from the PDD then calculate the beam quality index TPR{sub 20/10}. (author)

  16. Spectra and absorbed dose by photo-neutrons in a solid water mannequin exposed to a Linac of 15 MV; Espectros y dosis absorbida por fotoneutrones en un maniqui de agua solida expuesta a una Linac de 15 MV

    Energy Technology Data Exchange (ETDEWEB)

    Benites R, J. [Centro Estatal de Cancerologia de Nayarit, Servicio de Seguridad Radiologica, Calz. de la Cruz 118 Sur, 63000 Tepic, Nayarit (Mexico); Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Apdo. Postal 336, 98000 Zacatecas (Mexico); Velazquez F, J., E-mail: jlbenitesr@prodigy.net.mx [Universidad Autonoma de Nayarit, Posgrado en Ciencias Biologico Agropecuarias, Carretera Tepic-Compostela Km 9, 63780 Jalisco-Nayarit (Mexico)

    2012-10-15

    Using Monte Carlo methods was modeled a solid water mannequin; according to the ICRU 44 (1989), Tissue substitutes in radiation dosimetry and measurements, of the International Commission on Radiation Units and Measurements; Report 44. This material Wt 1 is made of H (8.1%), C (67.2%), N (2.4%), O (19.9%), Cl (0.1%), Ca (2.3%) and its density is of 1.02 gr/cm{sup 3}. The mannequin was put instead of the patient, inside the treatment room and the spectra and absorbed dose were determined by photo-neutrons exposed to a Linac of 15 MV. (Author)

  17. Problems of interference and geometry of the detectors in a beam tube for the determination of the neutron spectra; Problemas de interferencia y geometria de los detectores en un tubo de haces para la determinacion del espectro de neutrones

    Energy Technology Data Exchange (ETDEWEB)

    Paredes G, L C

    1991-11-15

    The detector materials were selected and proved for the thermal, intermediate and quick energy intervals of the neutron spectra, in the radial tube RW-2 to 1 MW of thermal power during 5 min, being obtained good results respect to the activation of the thin sheets. However, since the exhibition speed, of each experimental arrangement after it irradiation that was of the order of 2 R/h, it was considered that may be more convenient the irradiation, separated from each thin sheet, for that which it was selected the SINCA irradiation system, because it simplified the activities related with the individual irradiation of the thin sheets and the count of the same ones. It was found that the selection, the geometric arrangement and measurement of the activities of the used thin sheets, its are the three factors that more affect the input data of the SAND II code that it will be used in our case for the determination of the neutron spectra of the Reactor. (Author)

  18. Characterization of the neutron spectra at the final of the installations labyrinth with medical accelerators; Caracterizacion del espectro de neutrones al final del laberinto de instalaciones con aceleradores medicos

    Energy Technology Data Exchange (ETDEWEB)

    Carelli, J.; Cruzate, J.A.; Gregori, B.; Papadopulos, S.; Discacciatti, A. [Autoridad Reguladora Nuclear, Av. del Libertador 8250, Buenos Aires (Argentina)]. e-mail: jcarelli@cae.arn.gov.ar

    2006-07-01

    A linear electron accelerator for medical use is an equipment dedicated to the production of collimated beams of electrons and/or photons. In an accelerator of a bigger potential or equal to 6 MV, are produced neutrons starting from the reaction (gamma, n) due to the interaction of the photons with the materials that compose the headset and the target. In this work the theoretical and experimental studies carried out to characterize the neutron spectra to the exit of the labyrinth of three bunkers of different geometry with accelerators of 15 MV, with the purpose of evaluating the effective dose of the occupationally exposure personnel are presented. It was carried out the simulation of the neutron transport with the MCNPX code and the ENDF/B - VI library. With the objective of analyzing the variables that affect the spectral distribution the bunkers of two existent facilities in Argentina were modeled. It was considered a isotropic punctual source located in the supposed position of the target. The spectra of {sup 252} Cf and of Watt of 1.8 MeV of half energy were simulated. The election of the sources was based on published works that suppose initial neutron sources with half energy between 1.8 and 2.3 MeV for accelerators of 15 at 25 MV. Its were considered headsets of different dimensions, with and without phantom of water disperser in the patient's position and several field dimensions in the isocenter. The spectral distribution doesn't present significant differences in the different modeling situations. Its were carried out measurements, with the multisphere spectrometric system based on twelve polyethylene spheres and a spherical detector of {sup 3} He, to the exit of each one of the bunkers. It was carried out the convolution of the spectrum using the MXD{sub F}C33 code (of the UMG33 set), considering as initial spectrum that of the fission type (inverse of the energy). The obtained spectra and the environmental equivalent dose rate in each case

  19. Design of an artificial neural network, with the topology oriented to the reconstruction of neutron spectra; Diseno de una red neuronal artificial, con la topologia orientada a la reconstruccion del espectro de neutrones

    Energy Technology Data Exchange (ETDEWEB)

    Arteaga A, T.; Ortiz R, J.M.; Vega C, H.R.; Hernandez D, V.M.; Manzanares A, E.; Mercado S, G.A. [Unidades Academicas de Estudios Nucleares, Ingenieria Electrica y Matematicas, Universidad de Zacatecas, A.P. 336, 98000 Zacatecas (Mexico)]. e-mail: tarcicio70@yahoo.co.uk

    2006-07-01

    People that live in high places respect to the sea level, in latitudes far from the equator or that they travel by plane, they are exposed to atmospheres of high radiation generated by the cosmic rays. Another atmosphere with radiation is the medical equipment, particle accelerators and nuclear reactors. The evaluation of the biological risk for neutron radiation requires an appropriate and sure dosimetry. A commonly used system is the Bonner Sphere Spectrometer (EEB) with the purpose of reconstructing the spectrum that is important because the equivalent dose for neutrons depends strongly on its energy. The count rates obtained in each sphere are treated, in most of the cases, for iterative methods, Monte Carlo or Maximum Entropy. Each one of them has difficulties that it motivates to the development of complementary procedures. Recently it has been used Artificial Neural Networks, ANN) and not yet conclusive results have been obtained. In this work it was designed an ANN to obtain the neutron energy spectrum neutrons starting from the counting rate of count of an EEB. The ANN was trained with 129 reference spectra obtained of the IAEA (1990, 2001), 24 were built as defined energy, including isotopic sources of neutrons of reference and operational, of accelerators, reactors, mathematical functions, and of defined energy with several peaks. The spectrum was transformed from lethargy units to energy and were reaccommodated in 31 energies using the Monte Carlo code 4C. The reaccommodated spectra and the response matrix UTA4 were used to calculate the prospective count rates in the EEB. These rates were used as entrance and its respective spectrum was used as output during the net training. The net design is Retropropagation type with 5 layers of 7, 140, 140, 140 and 31 neurons, transfer function logsig, tansig, logsig, logsig, logsig respectively. Training algorithm, traingdx. After the training, the net was proven with a group of training spectra and others that

  20. Crescimento in vitro e aclimatização de Cattleya loddigesii Lindley (Orchidaceae com carvão ativado sob dois espectros luminosos In vitro growth and acclimatization of Cattleya loddigesii Lindley (Orchidaceae with actived charcoal in two light spectra

    Directory of Open Access Journals (Sweden)

    Renato Fernandes Galdiano Júnior

    2012-05-01

    Full Text Available O objetivo deste estudo foi avaliar a adição de concentrações de carvão ativado em meio de cultura ½ MS (com metade da concentração dos macronutrientes sob dois espectros luminosos para a obtenção de plântulas in vitro de Cattleya loddigesii. Plântulas com aproximadamente 90 dias foram subcultivadas em oito tratamentos, nos quais foi testada a adição ao meio de cultura ½ MS com carvão ativado (0; 0,5; 1,0 e 2,0g L-1 e combinados sob espectro de luz branca e luz vermelha. Após 180 dias da germinação, foram mensurados dados biométricos (raiz e parte aérea, massa fresca e teores de pigmentos fotossintéticos. Em plântulas aclimatizadas em casa de vegetação, foram avaliadas a taxa de sobrevivência após 120 dias. As concentrações de clorofila total, clorofila a e carotenoides foram maiores nos tratamentos sob luz branca, enquanto a luz vermelha influenciou significativamente maior clorofila b, plântulas com menos raízes e de menor comprimento e elevada mortalidade ex vitro. A adição de 2,0g L-1 de carvão ativado ao meio de cultura e o uso de luz branca proporcionaram maior eficiência de desenvolvimento tanto para as culturas in vitro quanto para a sobrevivência ex vitro das plantas.The aim of this study was to evaluate the effect of different concentrations of activated charcoal in ½ MS (half concentration of macronutrients culture medium under two light spectra on the in vitro growth of Cattleya loddigesii seedlings. Plantlets with approximately 90 days were subcultured under eight treatments, consisting of different active charcoal concentrations (0; 0.5; 1.0 and 2.0g L-1 in ½ MS medium combined with white and red light spectra. After 180 days of germination, biometric data, fresh weight, and the level of photosynthetic pigments were evaluated. Plantlets acclimatized in a greenhouse were evaluated for survival after 120 days. Total chlorophyll, chlorophyll a, and carotenoid concentrations were higher in

  1. Diagnóstico diferencial entre el espectro autista y el espectro esquizofrénico

    OpenAIRE

    Paula Pérez, Isabel, 1970-

    2012-01-01

    Introducción: La distinción nosológica entre espectro autista y espectro esquizofrénico está hoy en día claramente delimitada, a pesar de las evidencias científicas de la relación genética entre ambas condiciones. El solapamiento de síntomas negativos de la esquizofrenia con ciertas manifestaciones autistas y la atribución errónea de síntomas positivos de la esquizofrenia en el autismo por profesionales no familiarizados con los trastornos del espectro autista ponen de relieve la importancia ...

  2. Spectra and neutron dose of an 18 MV Linac using two geometric models of the head; Espectros y dosis por neutrones de un Linac de 18 MV usando dos modelos geometricos del cabezal

    Energy Technology Data Exchange (ETDEWEB)

    Barrera, M. T.; Pino, F.; Barros, H.; Sajo-Bohus, L. [Universidad Simon Bolivar, Laboratorio de Fisica Nuclear, Sartenejas, Baruta 1080-A, Caracas (Venezuela, Bolivarian Republic of); Davila, J. [Fisica Medica C. A., Av. Francisco de Miranda s/n, Los Palos Grandes, 1060 Miranda (Venezuela, Bolivarian Republic of); Salcedo, E. [Centro Medico Docente La Trinidad, Av. de El Haltillo, Caracas (Venezuela, Bolivarian Republic of); Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Benites R, J. L., E-mail: mariate9590@gmail.com [Centro de Cancerologia de Nayarit, Servicio de Seguridad Radiologica, Calz. de la Cruz 118 Sur, 63000 Tepic, Nayarit (Mexico)

    2015-10-15

    Full text: Using the Monte Carlo method, by MCNP5 code, simulations were performed with different source terms and 2 geometric models of the head to obtain spectra in energy, flow and doses of photo-neutrons at different positions on the stretcher and in the radiotherapy room. The simplest model was a spherical shell of tungsten; the second was the complete model of a heterogeneous head of an accelerator Varian ix. In both models Tosi function was used as a source term. In addition, for the second model Sheikh-Bagheri distribution was used for photons and photo-neutrons were generated. Also in both models the radiotherapy room of Gurve group of the Teaching Medical Center La Trinidad was included, which is equipped with an accelerator Varian Clinic 2100. In this Center passive detectors PADC (Cr-39) were irradiated with neutron converters, with 18 MeV photons radiation. The measured neutron flow was compared with that obtained with Monte Carlo calculations. The Monte Carlo flows are similar to those measured at the isocenter. The simplest model underestimates the neutron flow compared with the calculated flows with the heterogeneous model of the head. (Author)

  3. Forecast of physicochemical properties and chemical composition of gasoline from infrared spectra, using multivariate calibration; Previsao de propriedades fisico-quimicas e composicao quimica da gasolina a partir de espectros infravermelhos, utilizando calibracao multivariada

    Energy Technology Data Exchange (ETDEWEB)

    Cocco, Lilian Cristina; Yamamoto, Carlos Itsuo [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Lab. de Analise de Combustiveis Automotivos (LACAUTets)

    2008-07-01

    This work describes the attainment of mathematical models, applying multivariate calibration in infrared spectrum with ATR, from 128 gasoline samples with diverse chemical compositions, collected in a period of two and a half years. Infrared spectra had been used to assemble the input matrix for the modeling, whereas the standardized assays and gaseous chromatography had supplied the output matrices. Ninety samples were been used for training and 38 for testing. In order to calibrate chemical composition from chromatography, the techniques of mass spectrometry and chemical ionization were used to identify unknown substances and improve the fitting of the mathematical models. Two hundred and ninety substances were detected and identified, from which 100 were unknown. Six PLS/PCR models were attained to predict some properties as specific mass, Reid vapor pressure, T10, T50, T90 and PFE from distillation curve. Another six PLS/PCR models were attained to predict the amount of aromatics, paraffins, isoparaffins, naphthenes, olefins and oxygenates. In general, mathematical models were attained with good training fit, with correlation coefficients higher than 0,975 (T10) and reaching a maximum of 0,998 (naphthenes) and they are able to forecast an average chemical percentage and properties of interest from gasoline, with acceptable prediction errors. (author)

  4. Neutron spectra calculation and doses in a subcritical nuclear reactor based on thorium; Calculo de espectros de neutrones y dosis en un reactor nuclear subcritico a base de Torio

    Energy Technology Data Exchange (ETDEWEB)

    Medina C, D.; Hernandez A, P. L.; Hernandez D, V. M.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico); Sajo B, L., E-mail: dmedina_c@hotmail.com [Universidad Simon Bolivar, Laboratorio de Fisica Nuclear, Apdo. Postal 89000, Caracas 1080A (Venezuela, Bolivarian Republic of)

    2015-10-15

    This paper describes a heterogeneous subcritical nuclear reactor with molten salts based on thorium, with graphite moderator and a source of {sup 252}Cf, whose dose levels in the periphery allows its use in teaching and research activities. The design was done by the Monte Carlo method with the code MCNP5 where the geometry, dimensions and fuel was varied in order to obtain the best design. The result is a cubic reactor of 110 cm side with graphite moderator and reflector. In the central part they have 9 ducts that were placed in the direction of axis Y. The central duct contains the source of {sup 252}Cf, of 8 other ducts, are two irradiation ducts and the other six contain a molten salt ({sup 7}LiF - BeF{sub 2} - ThF{sub 4} - UF{sub 4}) as fuel. For design the k{sub eff}, neutron spectra and ambient dose equivalent was calculated. In the first instance the above calculation for a virgin fuel was called case 1, then a percentage of {sup 233}U was used and the percentage of Th was decreased and was called case 2. This with the purpose to compare two different fuels working inside the reactor. In the case 1 a value was obtained for the k{sub eff} of 0.13 and case 2 of 0.28, maintaining the subcriticality in both cases. In the dose levels the higher value is in case 2 in the axis Y with a value of 3.31 e-3 ±1.6% p Sv/Q this value is reported in for one. With this we can calculate the exposure time of personnel working in the reactor. (Author)

  5. Comparative Study of the Methods Used for the Computer Resolution of Composite Gamma-Ray Spectra; Etude Comparative des Methodes Utilisees pour la Resolution de Spectres Gamma Complexes au Moyen d'un Ordinateur; Sravnitel'noe izuchenie metodov razresheniya sostavnykh gamma-spektrov pri pomoshchi schetno-reshayushchego ustrojstva; Estudio Comparativo de los Metodos Aplicados para Resolver Espectros Gamma Complejos Mediante Calculadoras

    Energy Technology Data Exchange (ETDEWEB)

    DeHaan, A. Jr.; Leventhal, L.; Benson, P. [Tracerlab, Richmond, CA (United States)

    1965-10-15

    The resolution of complex mixtures of gamma-ray emitters has been expedited by the use of highly sophisticated gamma-ray spectrometers in association with digital computers. These instruments have now become generally available or easily accessible to technical laboratories. This paper discusses the techniques used in this laboratory to obtain the concentrations of individual gamma-emitting radionuclides in fallout samples and compares the results obtained by the various mathematical methods on composite samples. The computer derived data are compared with results obtained by radiochemical analysis of the sample. Binary mixtures were analysed by methods outlined below and then the analysis was extended to the many component system. A computer method was developed which normalizes gamma-ray spectra to minimize the effect of long-term spectrometer drift and converts the spectrum to an energy co-ordinate system. The effects of an ''unexpected photopeak, ''zero intensity component, and overlapping peaks on the solution by the various methods were investigated with special emphasis on low-level samples. The most common mathematical methods for resolving a composite gamma-ray spectrum into its components were investigated. Most of these procedures lead to estimates for the concentrations of the different gamma-ray emitters by one of the following methods: (1) The successive elimination of the radionuclides with higher energy photopeaks subtracting the pure spectrum from the composite spectrum until it has been resolved; (2) Peak resolution without stripping; (3) The establishment of a set of simultaneous linear equations of the same order as the number of radionuclides in the mixture and its solution; (4) The estimation of the unknown concentrations by the method of least-squares, either conventional or weighted; (5) A combined statistical and least-squares method employing stepwise multiple linear regression, an attempt to integrate decision-making processes into the

  6. Espectro infrarrojo de [zn(mh34](re042 com substituicion isotópica 14n/15n

    Directory of Open Access Journals (Sweden)

    Claudio Téllez

    1983-11-01

    Full Text Available The infrared spectra of [Zn(15NH34] (Re042 and the isotopoc shift 14N/15N (Zn-n for the metal-ligand band, is reportedInforma-se o espectro infravermelho do complexo de Zn(II, [Zn(15NH341(Re04 e o deslocamento isotópico 14N/15N, para a banda metal - ligante v(Zn-N.

  7. Trastorno del espectro autista y función ejecutiva

    OpenAIRE

    Talero, C.

    2015-01-01

    Las alteraciones en la función ejecutiva, especialmente en flexibilidad cognoscitiva, planeación, control inhibitorio y memoria de trabajo constituyen un elemento cardinal dentro las manifestaciones del trastorno del espectro autista (TEA). El objetivo de este trabajo fue evaluar el desempeño de las pruebas de función ejecutiva en una población de pacientes con trastorno del espectro autista (TEA).

  8. Incrementando la calidad de los espectros echelle

    Science.gov (United States)

    Pintado, O. I.; Adelman, S. J.

    For more than 10 years we have obtained spectra with the REOSC and EBASIM spectrograph at CASLEO. Usually we use IRAF to extract the spectra. Then we normalized the 1-d spectra and measured the lines with REDUCE. In this paper we compare the results obtained using each program in different parts of the spectrum measurements process. Wih EBASIM, or 4th magnitude stars and 120 minute exposures we obtain signal-to-noise ratios near 500 in the center of the orders

  9. Análisis funcional computarizado de espectros de infrarrojo

    Directory of Open Access Journals (Sweden)

    Augusto Rivera

    2009-07-01

    Full Text Available CALIPSO: Se discute un programa para microcomputador diseñado para asistir al espectroscopista en la Interpretación de espectro de Infrarrojo. Es un programa interactivo que utiliza la lógica booleana y árboles de decisión binaria definido por la presencia o ausencia, intensidad y forma de un pico específico en un espectro de infrarrojo. La Información relacionada con los grupos funcionales presentes en la molécula es confiable.

  10. Application of Monte Carlo Method in the Analysis of Materials. Used in Flat Panel Detectors to Get X-ray spectra; Aplicacion del Metodo de Monte Carlo en el Analisis de Materiales Utilizados en Detectores Flat Panel para Obtener Espectros de Rayos X

    Energy Technology Data Exchange (ETDEWEB)

    Gallardo, S.; Pozuelo, F.; Querol, A.; Rodenas, J.; Verdu, G.

    2013-07-01

    They have used various methods of reconstruction for the X-ray spectrum curve knowing the dose-response function. The results demonstrate that the method modified truncated singular value decomposition (MTSVD) is appropriate to reconstruct the spectra of X-ray scintillator materials studied in this work.

  11. El jardinero feliz: sobre populismo, democracia y espectros

    Directory of Open Access Journals (Sweden)

    Julián A. Melo

    2013-05-01

    Full Text Available Este texto tiene por finalidad rescatar diversos aspectos y debates en torno a la relación entre populismo y democracia. En ese sentido, expondremos los principales rasgos de las teorizaciones de autores como Margaret Canovan, Benjamín Arditi y Sebastián Barros para repensar los lazos entre aquellos dos términos. En un esfuerzo por no tomar a populismo y democracia como polos antitéticos en las formaciones políticas comunitarias, nos interesa resaltar el modo en que la idea de sombra y la de espectro han tenido centralidad en las concepciones de nuestros autores. Junto a esta reflexión, pretendemos retomar diversos núcleos discursivos de la experiencia del primer peronismo en la Argentina de mediados del siglo XX para indagar los modos en que la lógica del populismo peronista resignificó la democracia colocándola como elemento central de la identidad que se decía encarnar. Así, creemos que puede resultar interesante pensar no solo al populismo como espectro de la democracia sino también a la democracia como espectro del populismo.

  12. Unambiguous assigning of the signals of the nuclear magnetic resonance spectra of {sup 1} H and {sup 13} C of monoterpenes using computational methods; Asignacion inequivoca de las senales del espectro de resonancia magnetica nuclear de {sup 1} H y {sup 13} C de monoterpenos empleando metodos computacionales

    Energy Technology Data Exchange (ETDEWEB)

    Cortes, F.; Cuevas, G.; Tenorio, J.; Rochin, A.L. [Universidad Nacional Autonoma de Mexico, Instituto de Quimica, A.P. 70213, 04510 Mexico D.F. (Mexico)

    2000-07-01

    Ab initio calculations, within the frame of Density Functional Theory were carried out on camphene and {alpha}-pinene. The {sup 1} H and {sup 13} C shifts were estimated according to the recently developed Sum-Over-States Density Functional Perturbation Theory (SOS-DFPT) as implemented in a modified deMon-KS program. The calculations not only reproduced the observed NMR chemical shifts, quantitatively in the case of {sup 1} H nuclei and qualitatively in the case of {sup 13} C nuclei, but also allow assigning unambiguously the signal on these spectra. (Author)

  13. Neutron Spectra in H{sub 2}O, D{sub 2}O, BeO and CH{sub 2}; Spectres de Neutrons dans H{sub 2}O, D{sub 2}O, BeO et CH{sub 2}; Spektry nejtronov v H{sub 2}O, D{sub 2}O, BeO i CH{sub 2}; Espectros Neutronicos en H{sub 2}O, D{sub 2}O, BeO y CH{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Neill, J. M.; Young, J. C.; Trimble, G. D.; Beyster, J. R. [General Atomic Division of General Dynamics Corporation, John Jay Hopkins Laboratory for Pure and Applied Science, San Diego, CA (United States)

    1965-08-15

    Thermal neutron spectral measurements in moderators of interest to reactor technology are being made at General Atomic. The purpose of these measurements is to provide an integral check of the adequacy of proposed scattering models for these moderators. At present the scattering kernels are obtained by measuring the double differential scattering cross-sections directly, or by inferring them from a study of the vibrational and rotational motions of the molecules in a liquid or the lattice vibrational spectrum in a solid. The direct measurement has suffered from some experimental difficulties, such as obtaining the desired intensity and resolution and making the proper corrections for multiple scattering in the sample. From the standpoint of the application to reactor technology, the latter procedure for obtaining the scattering kernel has been more satisfactory in many instances. The integral measurements that have been made, coupled to comparative calculations of the neutron spectra, allow comment to be made on the status of the theoretical scattering models for H{sub 2}O, D{sub 2}O and BeO. In this paper, angular- and position-dependent spectra measured in H{sub 2}O and D{sub 2}O poisoned with boron or cadmium are presented and show improved agreement with the theoretical values. It appears that the Nelkin model for H{sub 2}O provides a reasonable first description for the scattering by that moderator. It also appears that the Honeck model for D{sub 2}O, an extension of the incoherent model for H{sub 2}O of Nelkin, is also an adequate description for some applications. This is surprising since deuterium, unlike hydrogen, is mostly a coherent scatterer; however it supports recent studies by Koppel which showed that the intramolecular and intermolecular interference scattering terms in D{sub 2}O tend to cancel. Measured angularly-dependent neutron spectra in BeO poisoned with borated stainless steel are also presented. In general the agreement of measurement with

  14. Determination of electron clinical spectra from percentage depth dose (PDD) curves by classical simulated annealing method; Determinacao de espectros de energia de eletrons clinicos a partir de curvas de porcentagem de dose em profundidade (PDP) utilizando o metodo de recozimento simulado classico

    Energy Technology Data Exchange (ETDEWEB)

    Visbal, Jorge H. Wilches; Costa, Alessandro M., E-mail: jhwilchev@usp.br [Universidade de Sao Paulo (USP), Ribeirao Preto (USP), SP (Brazil). Faculdade de Filosofia, Ciencias e Letras

    2016-07-01

    Percentage depth dose of electron beams represents an important item of data in radiation therapy treatment since it describes the dosimetric properties of these. Using an accurate transport theory, or the Monte Carlo method, has been shown obvious differences between the dose distribution of electron beams of a clinical accelerator in a water simulator object and the dose distribution of monoenergetic electrons of nominal energy of the clinical accelerator in water. In radiotherapy, the energy spectrum of electrons should be considered to improve the accuracy of dose calculation, because the electron beams that reach the surface traveling through internal structures of accelerator are not in fact monoenergetic. There are three principal approaches to obtain electron energy spectra from central PDP: Monte Carlo Method, Direct Measurement and Inverse Reconstruction. In this work, it will be presented the Simulated Annealing method as a practical, reliable and simple approach of inverse reconstruction as being an optimal alternative to other options. (author)

  15. Espectro clinicopatológico de las tiroiditis

    OpenAIRE

    Marsiglia, Italo

    2007-01-01

    El espectro clinicopatológico de las tiroiditis abarca, desde la rara tiroiditis aguda o supurativa hasta la más rara tiroiditis de Riedel. Las tiroiditis subaguda y silente (y su variante postpartum) también son enfermedades no comunes, mientras que la tiroiditis crónica autoinmune o enfermedad de Hashimoto resulta la tiroiditis y la enfermedad autoinmune órgano específica más frecuente, responsable de la mayor parte de los casos de hipotiroidismo. Efectivamente, en las áreas geográficas no ...

  16. Emisión de luz: espectro de frecuencias y ley del cuadrado de la distancia

    OpenAIRE

    Miret Marí, Juan José; Caballero Caballero, María Teresa; Pérez Rodríguez, Jorge; Espinosa Tomás, Julián

    2009-01-01

    Guión de la práctica de laboratorio de Física "EMISIÓN DE LUZ: ESPECTRO DE FRECUENCIAS Y LEY DEL CUADRADO DE LA DISTANCIA" Objetivos: Visualizar y realizar medidas sobre el espectro visible. Comprobar la ley del cuadrado de la distancia.

  17. Control Neuronal Combinado para Generar Espectros de Oleajes

    Directory of Open Access Journals (Sweden)

    Luis P. Sánchez Fernández

    2013-10-01

    Full Text Available Resumen: Se presenta un método novedoso para controlar la obtención de espectros de energía de oleajes, de gran utilidad en los laboratorios de investigación y desarrollo de Hidráulica Marítima. El elemento final de control o manipulador es un motor eléctrico lineal conectado a un servo-control el cual es supervisado mediante una computadora. El algoritmo de control automático se realiza con un esquema neuronal combinado, compuesto por una red neuronal artificial “feed-forward” y un controlador proporcional integral. El sistema computacional implementado incluye características de autoaprendizaje, materializado en el re-entrenamiento en línea de la red neuronal lo cual hace posible adaptarse a cambios en los parámetros del “proceso controlado” y a perturbaciones, altamente influyentes en el espectro de energía que impacta una obra hidráulica objeto de estudio. Abstract: A novel method is presented to control the generation of wave energy spectrum, useful in research and development laboratories of Maritime Hydraulic. The final control element is a linear electric motor connected to a servo-control which is monitored by a computer. The automatic control algorithm is performed with a combined neural scheme. It consists of an artificial neural network “feed-forward” and a proportional integral controller. The computer system includes self-learning based on an online training of the neural network. It makes possible to adapt to changes in the parameters of the “controlled process” and disturbances that impact the studied hydraulic work. Palabras clave: Control, neuronal, oleaje, espectros, hidráulica, Keywords: Control, neural, wave, spectrums, hydraulic

  18. El trastorno del espectro autista en la etapa de educación infantil

    OpenAIRE

    Pablo Lahuerta, Natalia

    2015-01-01

    Este trabajo se basa en el conocimiento, la evolución y las distintas características del Trastorno del Espectro Autista en diversos ámbitos, como son el educativo y el familiar. Por un lado se explica el concepto, la evolución, los síntomas y los distintos tipos de Trastorno del Espectro Autista para poder hablar también de ellos en el ámbito familiar y escolar. Por otro lado este trabajo, recoge los datos de un caso con posible trastorno del Espectro Autista, así como un cuestionario,...

  19. Aspectos genéticos y neuroendocrinos en el trastorno del espectro autista

    OpenAIRE

    Oviedo, Norma; Manuel-Apolinar, Leticia; de la Chesnaye, Elsa; Guerra-Araiza, Christian

    2015-01-01

    El autismo, hoy en día definido como trastornos del espectro autista, fue descrito inicialmente en 1943. Se caracteriza por alteraciones en la comunicación, la interacción social y un espectro restringido de intereses del paciente. Generalmente se identifica en etapas tempranas del desarrollo a partir de los 18 meses de edad. Actualmente el autismo se considera un desorden neurológico con un espectro que abarca diferentes grados que se asocian con factores genéticos, no genéticos y del medio ...

  20. Sexualidade e Transtorno do Espectro Autista: relatos de familiares

    OpenAIRE

    Vieira, Ana Carla [UNESP

    2016-01-01

    A educação sexual é um processo contínuo por meio do qual se aprende sobre aspectos da sexualidade; uma dimensão ampla e complexa que se desenvolve ao longo da vida das pessoas em suas interações com elementos sociais, culturais, econômicos, históricos e biológicos. Pessoas com deficiências como o Transtorno do Espectro Autista ou Síndrome de Asperger (TEA/SA) são comumente infantilizadas e a expressão de sua sexualidade é permeada de mitos. Além disso, geralmente não recebem educação sexual,...

  1. Documentos: democratizar el espectro radioeléctrico

    Directory of Open Access Journals (Sweden)

    Revista Chasqui

    2015-01-01

    Full Text Available Elseminario "Democratizar el espectro radioeléctrico" reunió, en Pozo de Rosas, Venezuela, del 11 al 15 de noviembre de 1996, a coordinadoras nacionales y representantes de medios comunitarios de Argentina, Brasil, Chile, Colombia, Ecuador, ElSalvador, Guatemala, México, Paraguay, Uruguay y Venezuela; a abogados provenientes de variospaíses de la región, y a directivos de lasdiez redes que integran el G-S: ALER, AMARe; CIESPAL, FELAFACS, FIp, PROA, RNTC, SCe; VIDEAZIMUfY WACC: con el auspicio de la Fundación Priedricb Eoert deAlemaniay el CECI de Canadá. Presentamos a continuación las conclusiones de este evento.

  2. Deconvolution of Moessbauer spectra using Voigt functions; Deconvolucion de espectros Moessbauer empleando funciones Voigt

    Energy Technology Data Exchange (ETDEWEB)

    Flores Ll, H J

    1990-08-15

    The form of the resonance line in Moessbauer spectroscopy is a form of Lorentzian line, but this form of line it enlarges due to several effects: finite thickness of the absorber, instrumental instability, diffusion of Co{sup 57} in crystals and fluctuations in the environment of the emitting nucleus. To take into account this effects it has been used as form of line in Moessbauer spectroscopy the Voigt function that is the convolution of a Lorentzian and a Gaussian. (Author)

  3. Los trastornos del espectro autista. Una perspectiva evolutiva Autistic spectrum disorders: An evolutive perspective

    OpenAIRE

    R. Canal Bedia

    2009-01-01

    Los trastornos del espectro autista constituyen un grupo de alteraciones neuroevolutivas que se presentan en una amplia variedad de expresiones clínicas, siendo todas consecuencia de disfunciones multifactoriales en el desarrollo del sistema nervioso central. En los sistemas internacionales de clasificación los trastornos del espectro autista están agrupados bajo el epígrafe de Trastornos Generalizados del Desarrollo. En todos los trastornos de este grupo se observan alteraciones cu...

  4. Abundancias químicas de estrellas de Mercurio-Manganeso obtenidas con espectros EBASIM

    Science.gov (United States)

    Pintado, O. I.; Adelman, S. J.

    Se determinan las abundancias químicas de estrellas de HgMn usando espectros obtenidos con EBASIM en CASLEO en un rango de longitud de onda comprendido entre los 400 y 890 nm. Los valores iniciales de temperatura efectiva y gravedad superficial se calculan con la fotometría uvbyβ. Las abundancias se calculan usando WIDTH9 y SYNTHE. Los resultados se comparan análisis realizados por los autores usando espectros obtenidos con el espectrógrado REOSC del CASLEO, el espectrógrafo echelle del Telescopio Anglo-Australiano y el espectrógrafo Coudé del Dominion Astrophysical Observatory.

  5. Oscilaciones acústicas y el espectro de potencias

    Directory of Open Access Journals (Sweden)

    L. Castañeda

    2007-01-01

    Full Text Available En el paradigma actual de la cosmología, el modelo que goza de mayor aceptación, dadas las pruebas observacionales, es conocido co- mo ΛCDM (Cosmic Microwave Background. Este modelo está dominado principalmente por dos constituyentes de los cuales la física sabe muy poco de ellos. La energía oscura, con un 70 %, es la principal componente y la causante de la expansión acelerada del Universo, mientras que la materia oscura, con un 25 % aproximadamente, es la componente principal de las estructuras auto-gravitantes. En mucho menos proporción se tiene la com- ponente bariónica, la principal constituyente de las estrellas y por ende de la parte luminosa de las galaxias. Otras especies con menor proporción son las constituyentes relativistas entre las cuales se tienen los neutrinos y fotones. Después del periodo de expansión acelerada del universo, de- nominado periodo inflacionario, debido a las altas temperaturas el plasma primordial constituído de especies relativistas fué el componente dominante en el Universo. En dicho plasma, la materia bariónica se encuentra ionizada y se acopla a la radiación via dispersión de Compton. Tal plasma caliente desarrolla inestabilidades manifiestas en ondas de sonido y rarefacciones. Estas perturbaciones son soportadas hasta cuando el Universo en su ex- pansión se ha enfriado lo suficiente para formar materia neutra. Después de esta recombinación, la radiación se desacopla formando el mar de fotones de CMB. Junto con perturbaciones métricas colocadas por inflación en el potencial de la materia oscura, las oscilaciones del plasma quedaron im- presas tanto en la temperatura de CMB como en el espectro de potencias de materia. Aquí se muestra como el Weak Lensing puede ser usado para estudiar estas oscilaciones.

  6. TRASTORNOS DEL ESPECTRO AUTISTA Y EXPOSICIONES OCUPACIONALES DE LOS PROGENITORES

    Directory of Open Access Journals (Sweden)

    Manuel Pino-López

    2013-01-01

    Full Text Available Fundamentos: Estudios con hermanos y gemelos sugieren un componente genético en el origen del autismo que no explica su crecimiento actual. El objetivo es investigar si factores ambientales como algunas exposiciones profesionales (trabajo nocturno, manejo de disolventes y/o campos electromagnéticos incrementan la probabilidad de trastornos del espectro autista (TEA en los hijos. Métodos: Estudio observacional de casos y controles mediante análisis de expedientes de 206 niños entre 16 y 36 meses de edad evaluados en el Servicio de Atención Temprana de Ciudad Real (70 con TEA y 136 no afectados. Para medir el riesgo de TEA asociado al trabajo nocturno, con disolventes y/o campos electromagnéticos se calculó la odds ratio (OR con un intervalo de confianza (IC del 95%. Resultados: El riesgo de TEA se multiplica por 2,22 cuando un progenitor trabaja en las ocupaciones estudiadas (OR=2,22, IC 95%=1,42-3,48, destacando trabajo con disolventes (OR=2,81, IC 95%=1,28-6,17 y nocturno (OR=2,18, IC 95%=1,21-3,93. El riesgo se multiplica por 3 si la madre trabaja en estas ocupaciones (OR=3, IC95%=1,44-6,26, destacando trabajo nocturno (OR=3,47, IC 95%=1,39-8,63 y con disolventes (OR=2,88, IC 95%=1,28-6,17. El riesgo se multiplica por 1,94 si el padre trabaja en estas ocupaciones(OR=1,94, IC 95%=1,07-3,53 y por 2,81 con disolventes (OR=2,81, IC 95%=1,01-7,86. Se encontró asociación positiva entre nivel educativo de los progenitores y TEA. Conclusiones: Encontramos relación significativa entre exposición de los progenitores a los riesgos estudiados y TEA en los hijos. Los resultados sugieren la participación de alteraciones genéticas ocasionadas por factores ambientales en el origen del trastorno.

  7. Espectro de Lyapunov de un Oscilador Colpitts en Base Común

    Directory of Open Access Journals (Sweden)

    Camilo Andrés Florez

    2013-09-01

    Full Text Available En el presente documento se presenta la definición de exponentes de Lyapunov de un sistema autónomo no lineal de tiempo continuo y una técnica recomendada para medir dicho conjunto de exponentes (espectro, con la finalidad de detectar la existencia de ciclos límites o de caos en un circuito oscilador Colpitts implementado con un transistor BJT. A partir del modelo de Ebers-Möll del transistor BJT se derivaron las ecuaciones de estado que rigen al circuito, luego se adoptó un caso numérico de estudio, y mediante el uso de un programa de simulación matemática se aplicó la metodología propuesta para determinar el espectro de Lyapunov del oscilador. Los resultados obtenidos evidencian la existencia de caos para algunos conjuntos de valores de los parámetros del circuito.

  8. Trastorno del Espectro Autista y competencia comunicativa: expresión emocional

    OpenAIRE

    Fernández Alonso, Lara

    2017-01-01

    El Trastorno del Espectro Autista (TEA) es un déficit que implica diferentes alteraciones a nivel comunicativo y emocional. La adquisición de estas habilidades es fundamental para un adecuado desarrollo personal y social y su integración plena en la sociedad. En consecuencia, el presente estudio pretende mostrar las principales características y dificultades comunicativas y emocionales que se dan en las personas con TEA. Asimismo, el estudio de diversos modelos de intervenci...

  9. Respuesta educativa a los alumnos con trastornos del espectro autista en la escuela ordinaria

    OpenAIRE

    Seseña Cuerda, María

    2013-01-01

    En las aulas, cada vez son más frecuentes alumnos que presentan necesidades educativas especiales derivadas del Trastorno del Espectro Autista. Estos trastornos se caracterizan por su gran heterogeneidad, presentando déficits persistentes en la comunicación e interacción social, así como patrones de comportamiento, intereses o actividades restringidas y repetitivas. Todo ello se manifiesta en edades tempranas, condicionando en gran medida el funcionamiento cotidiano y por tanto el proceso edu...

  10. Sondeo compresivo aplicado al sondeo de espectro de banda ancha eficiente en sistemas de radio cognitivo

    Directory of Open Access Journals (Sweden)

    Evelio Astaiza Hoyos

    2017-01-01

    Full Text Available Contexto: El sondeo de espectro es universalmente conocido como el principal habilitador de radio cognitivo (CR, dado que dota al dispositivo de CR de la capacidad de conocimiento del entorno de radio. Objetivo: En este artículo se presenta un algoritmo diseñado para realizar el sondeo de espectro de banda ancha en sistemas de radio cognitivo (CR. Método: El sondeo de espectro está basado en sondeo compresivo (CS, mediante el cual los usuarios cognitivos, sin necesidad de conocimiento a priori de características de la señal en el entorno de radio, minimizan la cantidad de muestras a procesar y, con ello, reducen de forma proporcional los tiempos de detección, consumos de energía y capacidades de procesamiento requeridas en los dispositivos de radio cognitivo (CRD. Resultados:  El desempeño del algoritmo propuesto se evalúa mediante la obtención de las curvas de probabilidad de detección, probabilidad de omisión de detección, probabilidad de falsa alarma y las características operativas del receptor (ROC en comparación con otros algoritmos propuestos en el estado del arte. Conclusión: Los resultados de simulación demuestran que el método propuesto permite realizar el sondeo de espectro de manera eficiente, mejorando el desempeño del sondeo en función de la probabilidad de detección y de las características operacionales del receptor con respecto a otros algoritmos propuestos basados en muestreo sub-Nyquist.

  11. Improved Techniques for Low-Flux Measurement of Prompt Neutron Lifetime, Conversion Ratio and Fast Spectra; Methodes Perfectionnees de Mesure de la Duree de Vie des Neutrons Instantanes, du Rapport de Conversion et des Spectres de Neutrons Rapides, dans un Reacteur a Bas Flux; Usovershenstvovannye metody izmereniya vremeni zhizni mgnovennykh nejtronov, koehffitsienta konversii i spektra bystrykh nejtronov pri slabykh potokakh nejtronov; Tecnicas Perfeccionadas para la Determinacion del Periodo de los Neutrones Inmediatos, la Razon de Conversion y los Espectros de Neutrones Rapidos, con Flujos Reducidos

    Energy Technology Data Exchange (ETDEWEB)

    Armani, R. J.; Bennett, E. F.; Brenner, M. W.; Bretscher, M. M.; Cohn, C. E.; Huber, R. J.; Kaufmann, S. G.; Redman, W. C. [Argonne National Laboratory, Argonne, IL (United States)

    1964-02-15

    Various statistical methods for the measurement of the ratio of prompt neutron lifetime to delayed fraction have been used in the zero-power reactor programme. One method was originated here, i.e. analysis of reactor noise with a bandpass filter, and others such as the measurement of the frequency of delayed coincidences among counter pulses as a function of delay time and the measurement of the relative variance of time integrals of the neutron flux as a function of integrating time have been refined. The areas of most advantageous application of the various methods have been studied. Attention has also been given to the interpretation of the results of these measurements, and it has been shown that interpretation based on a simple kinetics model is applicable to a wide range of practical cases. Several improvements in our original activation method for the low flux determination of the ratio of production to destruction of fissile material are described. These include the application of very sensitive radiochemical techniques as a confirming procedure; correction for extraneous counts, utilizing foils of different enrichments for the contribution of fission of the fertile material to the fission- product activity and foils exposed to different spectra for fission-related counts in the capture determination; and the use of coincidence counting for the detection of Np{sup 239} decay. Obtaining a value for conversion ratio from the activation data requires a knowledge of the ratio of captures to fissions in the fuel, {alpha}. No accurate experimental method now exists for the measurement of this quantity in a low flux reactor, but several methods which might make feasible such a determination are being explored. Three of the more promising techniques are outlined. Efforts to develop a small fast neutron spectrometer of good stability, resolution and sensitivity for in-pile measurements of neutron spectra in the energy region of tens and hundreds of kilovolts have

  12. Transtornos alimentares e os espectros do humor e obsessivo-compulsivo Eating disorders and the mood and obsessive-compulsive spectrum

    Directory of Open Access Journals (Sweden)

    Leonardo F Fontenelle

    2002-12-01

    Full Text Available Revisamos os estudos clínicos e biológicos que sugerem que os transtornos alimentares (TA são expressões fenotípicas de outros transtornos psiquiátricos e parte de espectros de psicopatologia, em especial dos espectros dos transtornos do humor e do transtorno obsessivo-compulsivo. A investigação da relação entre os TA e outros transtornos psiquiátricos através dos modelos espectrais pode proporcionar um melhor entendimento da fisiopatologia destas síndromes e a elaboração de tratamentos mais eficazes. Entretanto, o reconhecimento de que os TA possuem características peculiares e a adoção de uma postura crítica em relação a modelos que eliminam limites diagnósticos são também fundamentais para a evolução do conhecimento no campo.We reviewed the clinical and biological studies which have suggested that eating disorders (ED are phenotypical expressions of other psychiatric disorders and part of the spectra of other psychopathologies, specially the mood and obsessive-compulsive spectrum disorders. The study of the relationship between ED and other psychiatric disorders using the spectrum model of psychopathology may allow a better understanding of the pathophysiology of such syndromes and tailoring more effective treatments. However, the recognition that ED display particular characteristics and the adoption of a critical view with regard to models that eliminate diagnostic limits may also be important for the advancement in the area of eating behaviors.

  13. Taxonomía de asteroides y cometas basada en los espectros de Lyapunov

    Science.gov (United States)

    Tancredi, G.; Motta, V.; Froeschlé, C.

    Estudiaremos dos familias de objetos que sufren encuentros cercanos con planetas, a saber: la familia de cometas de Júpiter (JF) y los asteroides cercanos a la Tierra (NEAs). El movimiento de estos objetos es caótico en una escala de tiempo corta. Más aún, debido a los cambios erráticos en los elementos orbitales, la comparación de los valores actuales da poca información acerca de la posible vinculación dinámica entre los objetos de una misma familia. Calculamos una estimación finita de los Exponentes Característicos de Lyapunov (LCE), los llamamos Indicadores Característicos de Lyapunov (LCI) para ambas familias y analizamos las características del espacio de fase donde tiene lugar el movimiento de estos objetos. Integrando en un período suficientemente largo (e.g. 20000 años), encontramos que el LCI alcanza un valor cuasi-constante. La mayoría de los miembros de ambas familias muestran una concentración de los tiempos de Lyapunov (inverso del LCI) de alrededor de 50-100 años (Tancredi, 1995, Astron & Astrop., 299, 288). La concentración de los tiempos de Lyapunov es mayor para la familia de Júpiter que para los NEAs. Entre estos últimos, la menor dispersión se da para aquellos que cruzan la órbita de la Tierra. Se demostró que el espectro de los `indicadores locales' (Froeschlé et. al., 1990, Cel. Mec. 56, 307) o ``números de estiramiento'' (Voglis and Contopoulos, 1994, J. Phys. A 26, 4899) (relacionados con el LCI) son invariantes y nos dan una información más completa sobre el comportamiento caótico. Mediante la comparación de espectros discutimos la similitud entre los objetos de una misma familia y analizamos las diferentes posibles rutas al caos. Los espectros se clasifican mediante la comparación de los momentos de las distribuciones de los `números de estiramiento'. Aplicamos un método de agrupamiento jerárquico (Zappala et. al., 1990, Astron. J. 100, 2030) para identificar ``familias'' de espectros (grupos de espectros

  14. Necesidades de aprendizaje de los especialistas de Medicina General Integral sobre los trastornos del espectro autista

    Directory of Open Access Journals (Sweden)

    Víctor Tadeo Pérez Martínez

    Full Text Available Introducción: las necesidades de aprendizaje resultan de contrastar un desempeño ideal o propuesto con el real, bien sea para un individuo o un grupo determinado. Constituyen el punto de partida para la búsqueda de una solución pedagógica, capacitante, a fin de contribuir a la transformación cualitativa de los servicios de salud, y su oportuna identificación una trascendental herramienta de la educación permanente. Objetivo: identificar las necesidades de aprendizaje que sobre los trastornos del espectro autista, tienen los médicos que laboran en los Equipos de Atención Primaria de Salud, del municipio Playa. Método: se aplicó un cuestionario con carácter anónimo, en forma de examen escrito, a 20 especialistas de MGI seleccionados al azar, que laboran en tres policlínicas del extremo Este, del municipio Playa. Resultados: se puntualizaron las deficiencias e insuficiencias de los conocimientos y habilidades profesionales sobre los trastorno del espectro autista, fundamentalmente en lo que respecta a su detección temprana, diagnóstico precoz y escalas de evaluación psicoevolutiva. Conclusiones: a pesar de que los principales problemas de salud de nuestros niños y adolescentes constituyen, en el primer nivel de atención, programas priorizados, sobre todo los que a salud mental infanto-juvenil se refieren, la mayoría de los especialistas exhibió dificultades en el tratamiento integral de estos pacientes, persistiendo el espectro autista como un desorden habitualmente mal explorado y tardíamente diagnosticado, cuya evaluación adolece, en ocasiones, de elementos de obligatoria indagación y conocimiento, lo que afecta el adecuado seguimiento de los menores y su calidad de vida.

  15. Trastornos del Espectro Autista : Guía para padres y profesionales

    OpenAIRE

    Alcantud Marín, Francisco; Rico, D.; Lozano, L.

    2012-01-01

    A lo largo de los últimos años he sido testigo de múltiples intervenciones psico-educativas con familias que tienen que asumir el reto de educar un niño/a con Trastorno del Espectro Autista. Las primeras señales de alerta siempre son comunicadas a los profesionales por los padres con mucha angustia y pidiendo consejo, manifestando su falta de competencia en la educación de sus hijos/as. Efectivamente, primero antes de saber qué es lo que le pasa a su hijo/a los padres dudan de su ...

  16. Estrés parental e impacto familiar del trastorno del espectro autista: factores psicosociales implicados

    OpenAIRE

    Tijeras Iborra, María Amparo

    2017-01-01

    El Trastorno del Espectro Autista (TEA) constituye un diagnóstico encuadrado en el DSM-5 (APA, 2013) dentro de los trastornos del neurodesarrollo que se caracteriza fundamentalmente por la presencia de dificultades en la comunicación e interacción social, así como por la presencia de patrones repetitivos y restringidos de conductas, actividades e intereses. Tiene su inicio en la infancia, afecta a todas las áreas del desarrollo de la persona y sigue un patrón evolutivo diferente en cada caso,...

  17. Trastorno de espectro autista de alto funcionamiento y su relación con la familia

    OpenAIRE

    González Villafáñez, María Felisa

    2014-01-01

    El objetivo de este trabajo consiste en analizar las dificultades que tienen los adolescentes con Trastorno del Espectro Autista de Alto Funcionamiento (TEA-AF), en sus relaciones sociales y familiares. Este análisis ha requerido la revisión de las diversas definiciones y teorías explicativas del citado trastorno. A su vez también se describen las terapias conocidas hasta hoy para crear un programa de apoyo a los familiares (padres, hermanos, abuelos…) que se relacionan con dicho adolescente....

  18. Trastorno del espectro autista: Síndrome de Asperger. Programa de intervención comunitaria.

    OpenAIRE

    Rivera Mayoral, Sonia

    2017-01-01

    El Síndrome de Asperger es un trastorno neurobiológico, caracterizado por falta de sociabilización, intereses restringidos, y déficit lingüístico, así como dificultades para expresar y comprender emociones. Este Trabajo de Fin de Grado, describe en su primera parte, los Trastornos del Espectro Autista y sus rasgos clínicos, y en la segunda parte, el diseño y desarrollo de un Programa de intervención comunitaria en escuelas e institutos. El objetivo es sensibilizar y formar al e...

  19. Escuela Inclusiva: estudio de caso sobre la inclusión del Trastorno de Espectro Autista

    OpenAIRE

    Ortuñez Vegas, Sonia

    2016-01-01

    La educación inclusiva sigue siendo hoy una asignatura pendiente. Este trabajo plantea, un estudio de casos en dos colegios de Zaragoza, respecto a las dificultades y las necesidades que tienen los docentes a la hora de trabajar con niños autistas y de qué manera podría ser posible la inclusión de este alumnado en centros ordinarios. En primer lugar realizamos un breve resumen del trastorno del espectro autista y la evolución de la educación inclusiva. En segundo lugar, se pres...

  20. Trastorno del espectro autista: trabajo social y recursos en la ciudad de Valladolid

    OpenAIRE

    Cuevas Gordo, Alberto

    2016-01-01

    El presente trabajo en primera instancia, presenta la correcta conceptualización del Trastorno del Espectro Autista y sus criterios diagnósticos actuales, diferenciándolo de los dispares términos y divisiones utilizadas hasta ahora, y acompañado de las dificultades tanto diagnósticas como de heterogeneidad que presenta este colectivo. Partiendo de esta base, se realiza una búsqueda de recursos específicos para personas con TEA en la ciudad de Valladolid, para su posterior análisis y refle...

  1. Conceptos generales sobre aba en niños con trastorno del espectro autista

    OpenAIRE

    Piñeros Ortiz, Sandra Elizabeth; Toro Herrera, Sandra Milena

    2012-01-01

    Los trastornos del espectro autista (TEA) son entidades que generan discapacidad. Diversas intervenciones psicofarmacológicas y psicosociales modulan algunas de las alteraciones comportamentales asociadas y mejoran la calidad de vida de las personas afectadas y de sus cuidadores. La terapia ABA es una de las intervenciones psicosociales más conocidas y utilizada en población con TEA. Mediante de la  formulación de preguntas clave y sus respuestas, este artículo realiza una breve descripción d...

  2. Propriedades psicométricas da Escala de Responsividade Social-2 para Transtornos do Espectro Autista

    OpenAIRE

    Barbosa, Izabela Guimarães; Rodrigues, David Henrique; Rocha, Natália Pessoa; Simões-e-Silva, Ana Cristina; Teixeira, Antônio Lúcio; Kummer, Arthur

    2015-01-01

    Objetivo O objetivo deste trabalho foi avaliar as propriedades psicométricas da versão em português da Escala de Responsividade Social-2 (ERS-2) para crianças e adolescentes com transtorno do espectro autista (TEA). Métodos A ERS-2 foi respondida pelos pais de 90 pacientes com TEA e 25 controles saudáveis. Análises quanto à validade discriminante, índices de confiabilidade e separação, de adequação e calibração dos itens pelo modelo Rasch foram realizadas. Resultados A ERS-2 demonstrou b...

  3. Espectro clínico de tuberculosis cutánea Clinic spectrum of cutaneous tuberculosis

    OpenAIRE

    G Pizzariello; P Fernández Pardal; G D´Atri; V Novac; A Uranga

    2008-01-01

    La Tuberculosis (TBC) es producida por el Mycobacterium tuberculosis o bacilo de Koch, y se ha observado en las últimas décadas, una reemergencia de casos pulmonares y extrapulmonares. La TBC cutánea es infrecuente, y presenta un amplio espectro clínico dependiendo del interjuego existente entre el agente, el huésped y el ambiente. TBC cutánea, ilustrándola con casos clínicos de pacientes que concurrieron a nuestro servicio.Tuberculosis (TBC) is caused by Mycobacterium tuberculosis or Koch's ...

  4. El diagnóstico de la psicosis en adultos con trastornos del espectro autista

    OpenAIRE

    Lugo, J.

    2017-01-01

    Existe cierta controversia en el diagnóstico diferencial de dos entidades aparentemente bien delimitadas como son la psicosis y el autismo, especialmente cuando se trata de población adulta. Se presentan tres casos de pacientes en edad adulta que fueron atendidos en una unidad de internamiento breve y en los que se evidenció la presencia de un posible trastorno del espectro autista de base. En la evaluación de la presencia de un trastorno psicótico en el autismo se debe atender a las caracter...

  5. Influencia del solvente en el espectro ultravioleta de nitro y amino bifenilos

    Directory of Open Access Journals (Sweden)

    María Cristina B. de Gómez

    2009-07-01

    Full Text Available Los nitro y amino bifenilos fueron sintetizados, caracterizados y usados como solutos, para determinarles su espectro U.V. Los solventes empleados corresponden a la serie de los alcoholes, como son: Metanol, Etanol, n- e iso-Propanol, n-, iso- y sec-Butanol. Se encontró que la posición de la banda de máxima absorción de cada una de las soluciones se relaciona tanto con las características del soluto como del solvente. Estos efectos se resumen en la ecuación de Rao (12, cuya aplicabilidad queda confirmada para este caso.

  6. Measurements of the Asymptotic Spectrum of a Multiplying Medium; Mesures du Spectre Asymptotique d'Un Milieu Multiplicateur; Izmereniya asimptoticheskogo spektra umnozhayushchej sredy; Mediciones del Espectro Asintotico en un Medio Multiplicador

    Energy Technology Data Exchange (ETDEWEB)

    Slovacek, R. E.; Cerbone, R. J.; Gaerttner, E. R.; Fullwood, R. R.; Bach, D. R. [Rensselaer Polytechnic Institute, Troy, NY (United States)

    1965-08-15

    The asymptotic (in time) spectrum of a multiplying medium is of interest not only for analysing pulsed neutron experiments but also for investigating the neutron diffusion properties of the medium. The pulse-neutron-source mechanical chopper-technique has been developed to measure the asymptotic neutron spectrum in a multiplying assembly. The surface and centre (scalar) spectra were measured for each of four multiplying assemblies and comparisons were made with spectrum calculations. All of the multiplying systems contained enriched U{sup 235} and hydrogen as the moderator. Two of the assemblies were constructed of zirconium-clad fuel strips in water; the other two assemblies consisted of a mixture of UO{sub 2} and ZrO{sub 2} powders dispersed in paraffin. The sizes and hydrogen-to-U{sup 285} ratios were made different so that absorption, leakage and scattering were varied. The scalar spectrum was calculated by means of a steady state diffusion theory calculation. The agreement between the measured and scalar spectra was satisfactory when the measured value of the asymptotic decay constant was used to calculate the spectrum. The calculated asymptotic spectrum was found to be extremely sensitive to the decay constant; a 7% change in the decay constant for one of the assemblies resulted in a 47% change in the ratio of the thermal flux to the slowing-down flux. The surface spectra for two of the assemblies were obtained using a double P{sub 1} calculation. The surface spectrum calculation agreed with the data in the thermal region up to 0.2 eV. However, upon extending the range of comparison to higher energies, the measured leakage flux was about 50% harder than the calculated flux. Measurements of the surface spectrum have recently been obtained with better statistics to compare with other surface spectrum calculations. The asymptotic-spectrum measuring technique has been demonstrated as a useful method for studying position-dependent spectra. Steady state spectrum

  7. Formación de una asociación para personas con transtorno el espectro autista en Ecuador

    OpenAIRE

    Arroyo Stael, Ana María

    2014-01-01

    El Trastorno del Espectro Autista es una alteración del neurodesarrollo que se caracteriza por la presencia de un conjunto de dificultades en la interacción social, comunicación y conductuales. Numerosos estudios constatan que la prevalencia es mayor de lo que se piensa. La estimación de la prevalencia en la población general para trastornos del espectro autista más aceptada actualmente en las revisiones es de 6,7 casos por cada 1000 habitantes, de los cuales 4 corresponden al trastorno au...

  8. Ácido mandélico: Modelado de su estructura y espectro de rotación

    OpenAIRE

    Lirio Martínez, Ángel

    2016-01-01

    En este trabajo, se ha realizado el modelado teórico del panorama conformacional de la molécula del ácido mandélico, mediante el uso de diversos tipos de métodos computacionales. Una vez obtenidos los confórmeros más estables, todos con energías menores a 1000 cm-1, se llevado a cabo un análisis de las interacciones intramoleculares que se dan. A partir de los datos obtenidos se ha realizado el modelado del espectro de rotación de cada confórmero, en el rango del espectro de 1...

  9. Interfaces naturales como factor de progreso cognitivo y social en personas que padecen Trastorno del Espectro Autista

    OpenAIRE

    Pons, Claudia; Contreras, Víctor; Zavala, Gonzalo; Fernández, Daniel; Holc, Matías; Passarelli, Cinthya

    2015-01-01

    El trastorno de espectro autista (TEA) es una alteración del desarrollo que se especifica por deficiencias cualitativas en la comunicación y en la interacción social, comportamiento caracterizado por patrones repetitivos y estereotipados. Los niños con trastorno del espectro autista (TEA), como también otros niños que no padecen este trastorno, presentan una característica bien definida por la aceptación a las Tecnologías de la Información y la Comunicación (TIC). Objetivo. Este proyecto t...

  10. Agendas visuales y procesos, elementos básicos en la vida del alumnado con Trastorno del Espectro del Autismo

    OpenAIRE

    Rodríguez Molino, Joana

    2014-01-01

    Este Trabajo Fin de Grado comienza haciendo un repaso de las definiciones y características asociadas a los Trastornos del Espectro del Autismo para poder considerar las pautas de intervención más acertadas a seguir con este alumnado. También se hace hincapié en los Sistemas Alternativos y Aumentativos de Comunicación como medio de comunicación y aprendizaje para estos niños/as. Se presenta una propuesta de intervención educativa llevada a cabo con un niño con Trastorno del Espectro del A...

  11. EFECTIVIDAD DE LA MUSICOTERAPIA EN EL TRASTORNO DE ESPECTRO AUTISTA: ESTUDIO DE REVISIÓN

    Directory of Open Access Journals (Sweden)

    Marta Calleja-Bautista

    2016-05-01

    Full Text Available Este trabajo incluye una revisión de la literatura existente sobre intervenciones en musicoterapia en personas con Trastorno de Espectro Autista (TEA con el objetivo de analizar el grado de efectividad de estas intervenciones. Para llevar a cabo esta revisión, se realizó una búsqueda bibliográfica en las bases de datos pertinentes, y considerando los criterios de inclusión delimitados se incluyeron un total de 18 estudios, cuyos resultados han sido analizados. En 11 de las 18 intervenciones se obtienen mejoras estadísticamente significativas, mientras que en las 7 intervenciones restantes, o bien la mejoría no alcanza la significación estadística, o bien existe algún tipo de limitación en cuanto a la efectividad de la intervención en evaluaciones de seguimiento. Considerando estos resultados se concluye que la musicoterapia puede llegar a convertirse en una práctica prometedora para mejorar la comunicación e interacción social de las personas con TEA. Sin embargo, todavía es necesario un mayor volumen de investigación para aclarar qué tipo de intervenciones y en qué ámbitos del espectro autista en concreto son realmente eficaces estas intervenciones.

  12. POTENCIAL FISIOLÓGICO DE ESPÉCIES OLERÍCOLAS SUBMETIDAS A DIFERENTES ESPECTROS DE LUZ

    Directory of Open Access Journals (Sweden)

    Mauricio Ferrari

    2016-10-01

    Full Text Available O objetivo do trabalho foi avaliar o efeito de diferentes espectros de luz sobre o potencial fisiológico de espécies olerícolas. O experimento foi conduzido em delineamento inteiramente casualizado, no esquema fatorial três por cinco, com quatro repetições. As três espécies testadas foram alface (Lactuca sativa L., rúcula (Eruca sativa Mill. e couve chinesa (Brassica rapa var. pekinensis. Os cinco espectros de luz utilizados foram: vermelho, azul, amarelo, branco e ausência de luz. O teste de germinação foi conduzido em germinador tipo BOD, com temperatura constante de 25°C. Para a alface o espectro azul revela efeito negativo sobre as variáveis primeira contagem, percentual de germinação e comprimento de radícula. Para espécies de rúcula e couve chinesa, o espectro de luz vermelha e amarela apresentaram os melhores resultados para as variáveis estudadas.

  13. Espectros de emisión de radioluminiscencia y termoluminiscencia de una leucita de Monte Somma (Italia

    Directory of Open Access Journals (Sweden)

    Correcher, V.

    2004-12-01

    Full Text Available Natural leucite (KAlSi2O6, one of the main components of dental ceramics, shows similar radioluminescence (RL and thermoluminescence (TL response than other aluminosilicates (in the 200-800nm region employed for dosimetric purposes. Despite the complex structure of the emission spectra, both glow curves can be fitted to six gaussian functions peaked at 300, 380, 430, 480, 550 and 680nm. We infer that the involved electronic traps are of the same origin regardless of the luminescence process. The chemical analysis performed by X-ray fluorescence (XRF allows us to seek relationships between the content of the impurities of the crystal lattice and the emission bands.

    La leucita natural (KAlSi2O6, materia prima para la fabricación de cerámicas dentales, es un material potencialmente válido para su utilización con fines dosimétricos ya que su respuesta luminiscente (radioluminiscencia -RL- y termoluminiscencia -TL- en la región espectral del visible (200-800nm es similar a la de otros aluminosilicatos utilizados también con fines dosimétricos. A pesar de la complejidad de las curvas, los espectros de emisión de TL y RL obtenidos con una leucita del Monte Somma (Nápoles, Italia se pueden ajustar a un número máximo de seis funciones gaussianas situadas a 300, 380, 430, 480, 550 y 680 nm con significado físico. Este ajuste indica que en ambos procesos las trampas electrónicas que intervienen tienen el mismo origen. El análisis químico realizado por Fluorescencia de Rayos X (FRX de la leucita estudiada permite intentar vincular el contenido de impurezas presentes en la red cristalina del material con las bandas de emisión que se producen como consecuencia de las distorsiones estructurales que se generan en la red cristalográfica formada por los tetraedros de SiO4 y [AlO4].

  14. Espectro clínico de tuberculosis cutánea Clinic spectrum of cutaneous tuberculosis

    Directory of Open Access Journals (Sweden)

    G Pizzariello

    2008-09-01

    Full Text Available La Tuberculosis (TBC es producida por el Mycobacterium tuberculosis o bacilo de Koch, y se ha observado en las últimas décadas, una reemergencia de casos pulmonares y extrapulmonares. La TBC cutánea es infrecuente, y presenta un amplio espectro clínico dependiendo del interjuego existente entre el agente, el huésped y el ambiente. TBC cutánea, ilustrándola con casos clínicos de pacientes que concurrieron a nuestro servicio.Tuberculosis (TBC is caused by Mycobacterium tuberculosis or Koch's bacillus, and there was a re-emergence of pulmonary and extrapulmonary cases in the last decades. Cutaneous TBC is uncommon, there is a broad clinical spectrum and an interrelationship between the agent, the guest and the environment. A description of each form of cutaneous TBC was made, illustrating it with clinical cases of patients who were attended in our service.

  15. Comunicación y lenguaje en personas que se ubican dentro del espectro autista

    Directory of Open Access Journals (Sweden)

    Ronald Soto Calderón

    2007-01-01

    Full Text Available Una de las mayores dificultades de las personas que se ubican dentro del espectro autista, está relacionado con los elementos semántico pragmáticos de la comunicación, no obstante, quienes tienen relación con ellas en un afán de satisfacer sus necesidades procuran darle “entender lo que ellas dicen” sin tener en cuenta que muchas veces son meras interpretaciones propias, situación que afecta el desarrollo y utilización de un método o una estrategia de enseñanza del lenguaje y la comunicación a estas personas. Con este artículo se pretende realizar un corto recorrido por las características del lenguaje en personas con autismo, y algunos métodos que podrían favorecer el desarrollo de destrezas comunicativas en ellas.

  16. Conceptos generales sobre ABA en niños con trastorno del espectro autista

    Directory of Open Access Journals (Sweden)

    Sandra Elizabeth Piñeros Ortiz

    2012-01-01

    Full Text Available Los trastornos del espectro autista (TEA son entidades que generan discapacidad. Diversas intervenciones psicofarmacológicas y psicosociales modulan algunas de las alteraciones comportamentales asociadas y mejoran la calidad de vida de las personas afectadas y de sus cuidadores. La terapia ABA es una de las intervenciones psicosociales más conocidas y utilizada en población con TEA. Mediante de la  formulación de preguntas clave y sus respuestas, este artículo realiza una breve descripción de los aspectos históricos, las principales características y los fundamentos teóricos del ABA. Se discuten los resultados de diversos estudios que señalan las limitaciones metodológicas de las investigaciones sobre  la efectividad de esta terapia y sus implicaciones para la práctica clínica.

  17. Propriedades psicométricas da Escala de Responsividade Social-2 para Transtornos do Espectro Autista

    Directory of Open Access Journals (Sweden)

    Izabela Guimarães Barbosa

    2015-09-01

    Full Text Available Objetivo O objetivo deste trabalho foi avaliar as propriedades psicométricas da versão em português da Escala de Responsividade Social-2 (ERS-2 para crianças e adolescentes com transtorno do espectro autista (TEA. Métodos A ERS-2 foi respondida pelos pais de 90 pacientes com TEA e 25 controles saudáveis. Análises quanto à validade discriminante, índices de confiabilidade e separação, de adequação e calibração dos itens pelo modelo Rasch foram realizadas. Resultados A ERS-2 demonstrou boa consistência interna (alfa de Cronbach = 0,952, um ponto de corte de 41, sensibilidade de 96,8%, especificidade de 100% e valor preditivo negativo de 99,9% para a identificação de TEA. As subescalas apresentaram, de forma geral, adequação ao modelo. No entanto, alguns itens se apresentaram pouco consistentes do ponto de vista estatístico (correlação item-total negativas e misfitting. O mapa de itens mostrou má cobertura da variável latente, especialmente no espectro mais leve do TEA. Conclusão Os resultados deste estudo mostraram que a versão em português da ERS-2 pode ser utilizada como ferramenta de triagem para o reconhecimento de TEA em crianças e adolescentes brasileiros. A escala pode ter versões futuras aprimoradas com a substituição dos itens com pior desempenho.

  18. CALIDAD DE VIDA EN PERSONAS CON TRASTORNO DEL ESPECTRO DEL AUTISMO

    Directory of Open Access Journals (Sweden)

    Coral García-Hortal

    2017-03-01

    Full Text Available El objetivo de este estudio es la aplicación de la Escala Kidslife (Gómez et al., 2016 en niños y adolescentes con diagnóstico de trastorno del espectro del autismo y discapacidad, y analizar la influencia de variables personales como edad, sexo, grado de discapacidad y necesidades de apoyo sobre su calidad de vida. Materiales y métodos. Se utiliza una metodología cuantitativa con una muestra intencionada de 35 participantes, pertenecientes a un “centro de educación especial”. La escala fue cumplimentada por personal de este centro. Resultados. La Escala Kidslife es útil para estudiar la calidad de vida en esta población, siendo significativas las variables personales entre las dimensiones de inclusión social, bienestar físico, bienestar material, bienestar emocional y relaciones interpersonales de calidad de vida. Conclusiones. Existe una diferencia de puntuación entre el personal de atención directa como los auxiliares y los profesionales como educadores, psicólogos, etc. Recomendaciones. Se sugiere la necesidad de realizar escalas que puedan ser autocumplimentadas por los propios participantes.

  19. Autocuidado da criança com espectro autista por meio das Social Stories

    Directory of Open Access Journals (Sweden)

    Patricia Maria da Silva Rodrigues

    Full Text Available Resumo Objetivos: Aplicar o processo de enfermagem da teoria do autocuidado, de Dorothea Orem, e utilizar a Social Stories como ferramenta de aprendizagem aliada à teoria do autocuidado pela criança com Transtorno do Espectro Autista. Métodos: Estudo qualitativo, descritivo, caso único de uma criança com Síndrome de Asperger. Realizado no domicílio, fundamentado na teoria de Dorothea Orem, com utilização da Social Stories. Coleta de dados feita por meio de entrevistas semiestruturadas, anamnese e intervenções de enfermagem. Resultados: Realizaram-se três intervenções semanais para o estímulo ao autocuidado e avaliações com a mãe acerca da evolução da criança. Constatou-se a evolução da criança do sistema parcialmente compensatório para o sistema de apoio-educação, devido ao aumento da capacidade de autocuidado no banho, na escovação dos dentes e na higienização após as eliminações intestinais. Conclusão: A associação da teoria de Orem com a Social Stories apresentou-se como uma estratégia efetiva no estímulo ao autocuidado pela criança.

  20. Caracterización parcial y espectro antimicrobiano de substancias inhibitorias producidas por Alteromonas marinas

    Directory of Open Access Journals (Sweden)

    Jorge León

    2014-06-01

    Full Text Available Se caracterizan parcialmente substancias inhibitorias producidas por cepas marinas del género Alteromonas spp. Pruebas de precipitación de extractos crudos de sobrenadantes de las cepas N22.C y N11.6 con concentraciones saturantes de sulfato de amonio y filtrados en columnas de Sephadex G-25 muestran la producción de substancias inhibitorias (SI de naturaleza proteinácea. Otros ensayos de caracterización revelan que dichas substancias tienen un amplio espectro de actividad antibiótica frente a cepas de colección patógenas de peces, moluscos y crustáceos. Asimismo, muestran a las SI como termosensibles a 90oC en 45 min y con capacidad de mantener estabilidad inhibitoria dentro, del rango de pH de 3,0 a 9,0 hasta por 15 min. La actividad antibiótica de las substancias frente a Vibrio anguillarum NCMB 2133, V. anguillarum ATCC 19264 y Aeromonas salmonicida 67,79 fueron comparativamente equivalentes a 30 ppm del antibiótico oxitetraciclina (OTC.

  1. La psicopatología del trastorno del espectro autista en perspectiva de segunda persona

    Directory of Open Access Journals (Sweden)

    Ana María Giraldo Giraldo

    2014-01-01

    Full Text Available Ha sido ampliamente estudiado, cómo el estudio de la psicopatología del trastorno del espectro autista (TEA tiene grandes consecuencias para algunas teorías de filosofía de la mente. Empero, no solo los estudios en psicología dejan huella en la filosofía, sino que también algunos estudios en filosofía surten efecto en la psicología. El caso que se presenta en este artículo es de doble vía. Por un lado, cómo la psicopatología del TEA obliga a la filosofía de la mente a repensar la vida mental y, por otro, cómo un cambio de perspectiva en la explicación de la interpretación psicológica, de la mano de Wittgenstein, obliga a la psicología a repensar la psicopatología del TEA.

  2. Beta spectra. II-Positron spectra

    International Nuclear Information System (INIS)

    Grau, A.; Garcia-Torano, E.

    1981-01-01

    Using the Fermi theory of beta decay, the beta spectra for 30 positron emitters have been computed, introducing a correction factor for unique forbidden transitions. The spectra are ploted vs. energy, once normalised, and tabulated with the related Fermi functions. The average and median energies are calculated. (author)

  3. Transtornos do Espectro Autista e sexualidade: um estudo de caso na perspectiva do cuidador

    Directory of Open Access Journals (Sweden)

    Rafael De Tilio

    2017-06-01

    Full Text Available Los Trastornos del Espectro Autista (TEA son un grupo de trastornos del neurodesarrollo que afecta, entre otros aspectos la interacción social y la comunicación. La rutina y dinámica familiar de los portadores de TEA son afectados y, a veces, sus familiares/cuidadores no reconocen sus posibilidades de desarrollo (biológico y psicológico, incluyendo su sexualidad que pasa a ser infantilizada, negada o rechazada. El objetivo de esta investigación fue pesquisar como un cuidador comprende un individuo con TEA, específicamente en la vivencia de su sexualidad. Los datos fueron obtenidos por medio de una entrevista semiestructurada, gravada y transcripta integralmente con la hermana cuidadora de un adulto de 35 años, diagnosticado a menos de una década. Después de un análisis de contenido temático los resultados mostraron que hay una aceptación parcial de la sexualidad de aquel individuo por sus familiares (respeto por su privacidad y masturbación al mismo tiempo en que hay muchos conflictos (vergüenza, miedo de comportamientos hipersexualizados no adecuados en público; mas allá de eso, la cuidadora o familiares no recibieron formación especializada para cuidar de acometidos por TEA, lo que aumenta las dificultades. En este sentido, y delante de esta tención, se refuerza la importancia de más acciones educativas en cuidados en salud y educación y de investigaciones entre sexualidad, familia, TEA y cuidados que busquen la consolidación de derechos (sexuales y reproductivos de estos sujetos.

  4. Comunicación y lenguaje en personas que se ubican dentro del espectro autista

    Directory of Open Access Journals (Sweden)

    Soto Calderón, Ronald

    2007-08-01

    Full Text Available Resumen: Una de las mayores dificultades de las personas que se ubican dentro del espectro autista, está relacionado con los elementos semántico pragmáticos de la comunicación, no obstante, quienes tienen relación con ellas en un afán de satisfacer sus necesidades procuran darle “entender lo que ellas dicen” sin tener en cuenta que muchas veces son meras interpretaciones propias, situación que afecta el desarrollo y utilización de un método o una estrategia de enseñanza del lenguaje y la comunicación a estas personas. Con este artículo se pretende realizar un corto recorrido por las características del lenguaje en personas con autismo, y algunos métodos que podrían favorecer el desarrollo de destrezas comunicativas en ellas.Abstract: One of the biggest difficulties that lie in to the autistic spectre, is related to the semantic pragmatic elements of communication, nevertheless, those who are related to those fundamentals of communication, in the need to satisfy their needs procure giving “understanding to what they say” without realizing that most times those are nothing but insightful interpretations, which affect the development and method employment or a language teaching strategy and communication of such people. This article is intended to take a short look into the language characteristics from people with autism and some methods that might favour their communication skills development.

  5. Presencia de beta-lactamasas de espectro extendido en dos hospitales de Lima, Perú

    Directory of Open Access Journals (Sweden)

    José-Luis Morales

    2005-03-01

    Full Text Available Objetivo: Estudiar la presencia de beta-lactamasas de espectro extendido (BLEE e identificar los tipos Temoniera (TEM y sulfidrilo variable (SHV producidas por cepas de Escherichia coli y Klebsiella pneumoniae en dos hospitales de Lima. Material y Métodos: La selección y confirmación de cepas productoras de BLEE se realizó mediante pruebas de susceptibilidad antimicrobiana, utilizando los criterios de la National Committee for Clinical Laboratory Standards (NCCLS; la identificación de los genes blaTEM y blaSHV se realizó mediante el análisis de la reacción en cadena de la polimerasa (PCR para su posterior secuenciamiento genético. Resultados: Se recolectó consecutivamente entre julio y septiembre de 2000, 137 cepas de Escherichia coli y 18 cepas de Klebsiella pneumoniae. La mayoría mostró alta resistencia a las cefalosporinas de tercera generación y aztreonam; 2,9% del total de E.coli y 44,4% del total de K.pneumoniae aisladas fueron confirmadas como productoras de BLEE. Todas las cepas productoras de BLEE fueron multirresistentes y la mayoría presentó co-resistencia a sulfametoxazol/trimetoprim, amikacina, gentamicina y ciprofoxacina. Se identificó la presencia del gen blaTEM en 4 cepas (3 K. pneumoniae y 1 E. coli y el gen blaSHV en 6 cepas (3 K. pneumoniae y 3 E. coli. El secuenciamiento de los correspondientes genes confirmó las BLEEs TEM-10 y SHV-5. Conclusión: Se demostró la presencia de BLEE tipo TEM y SHV, asociado a multirresistencia antibiótica.

  6. Espectro de gotas de pontas de pulverização com adjuvantes de uso agrícola

    OpenAIRE

    Cunha,J.P.A.R.; Bueno,M.R.; Ferreira,M.C.

    2010-01-01

    O sucesso de uma boa aplicação de produtos fitossanitários depende da sinergia entre fatores como tamanho de gota, tipo de ponta, pressão, volume e composição da calda e características do alvo. Assim, o objetivo deste trabalho foi avaliar o espectro de gotas produzidas por pontas de jato plano defletor (TT 11002) e jato plano defletor com indução de ar (TTI 11002), com diferentes adjuvantes adicionados à calda de pulverização, pela técnica de difração de raio laser. O experimento foi conduzi...

  7. Caracterización neuropsicológica para mejorar la comunicación en Trastornos de Espectro Autista

    OpenAIRE

    García-Gallego, Laura

    2016-01-01

    Los Trastorno de Espectro Autista (TEA) son trastornos del neurodesarrollo que se detectan en los primeros años de vida afectando y alterando de forma muy significativa las áreas de la comunicación, la interacción social y la conducta (DSM-V, 2013). Con el presente estudio se pretende realizar un programa de intervención para la mejora de la dimensión comunicativa, a través de la realización de un protocolo de evaluación, constituido por 8 pruebas neuropsicológicas. Debido a la amplia vari...

  8. Calidad de vida en niños y adolescentes con trastorno del espectro autista sin discapacidad intelectual

    OpenAIRE

    Cuesta-Gómez, José Luis; Vidriales-Fernández, Ruth; Carvajal-Molina, Fernando

    2016-01-01

    Introducción. El concepto de calidad de vida tiene gran importancia en la intervención dirigida a las personas con discapacidad. Resulta indiscutible que el alcance de una calidad de vida satisfactoria debe ser el objetivo de las intervenciones clínicas dirigidas al colectivo de personas con trastorno del espectro autista (TEA), y un elemento clave para diseñar los tratamientos necesarios que mejoren el pronóstico de desarrollo futuro. A pesar de ello, el conocimiento sobre las condi...

  9. Evaluación de la asistencia social y sanitaria en personas con trastorno del espectro autista

    OpenAIRE

    Solano Sánchez, María; Jenaro Río, Cristina

    2013-01-01

    [ES] Autismo, más utilizado actualmente Trastornos del Espectro Autista (TEA),se estudia la realidad clínica y social que afrontan las personas diagnosticadas con autismo y sus familiares, a través de un estudio cualitativo y cuantitativo, con el objetivo de poder ayudar a la creación de estrategias en el ámbito educacional y sanitario, que sean más eficientes y ayuden a su integración y desarrollo. Trabajo Fin de Master Curso 2012/2013

  10. Programa para la mejora de la capacidad comunicativa en el alumnado con Trastorno del Espectro Autista. Competencia descriptiva

    OpenAIRE

    Martín Moreno, Lucía

    2014-01-01

    El trabajo Fin de Grado, “Programa para la Mejora de las Descripciones en el Alumnado con TEA” está centrado en el caso de un niño con Trastorno del espectro autista (TEA), que presenta problemas socio-comunicativos, principalmente a nivel pragmático que le afectan fundamentalmente a su relación y comunicación con los compañeros. Se ha diseñado un programa específico basado en el uso de las descripciones. Para ello se ha realizado una revisión teórica, alrededor de los diferentes problemas de...

  11. El papel de la enfermería en niños con Trastorno del Espectro Autista

    OpenAIRE

    Sánchez Pérez, Alba

    2016-01-01

    Actualmente el Síndrome de Asperger, el autismo, el trastorno desintegrativo infantil y los trastornos generalizados del desarrollo no especificados, se aúnan en el DSM.V y este les define como un único diagnóstico, denominado Trastorno del Espectro Autista (TEA) , de origen aún desconocido y caracterizado por una perturbación socio-comunicativa. Dicho trastorno posee unos niveles de prevalencia que van en aumento, con unos tratamientos y terapias no curativas, pero que pueden mejorar en gran...

  12. Efectos de los cúmulos ionizantes de baja masa en el espectro de regiones H II y galaxias

    OpenAIRE

    Villaverde Aparicio, Marcos

    2012-01-01

    Para estudiar estos efectos de muestreo, ver en que caso son relevantes y como influyen en el espectro integrado de líneas de emisión de galaxias espirales, hemos realizado un total de dos millones de simulaciones Monte Carlo de cúmulos con edad cero y metalicidad solar con masas entre 20 y 106 M¿. Las masas de los cúmulos se han asignado muestreado aleatoriamente un función inicial de masas de cúmulos (ICMF). Para cada cúmulo la masa de las estrellas individuales se han obtenido muestreando ...

  13. Método para sensado del espectro basado en separación ciega de fuentes para ambientes de radio cognitiva

    OpenAIRE

    Sepúlveda Cano, Lina María; Quiza Montealegre, Jhon Jair; Gil Taborda, Camilo; Gómez García, Jorge Andrés

    2016-01-01

    El uso eficiente del espectro se ha convertido en un área de investigación activa, debido a la escasez de este recurso y a su subutilización. En un escenario en el que el espectro es un recurso compartido como en la radio cognitiva (CR), los espacios sin uso dentro de las bandas de frecuencias con licencia podrían ser detectados y posteriormente utilizados por un usuario secundario a través de técnicas de detección y sensado del espectro. Generalmente, estas técnicas de detección se utilizan ...

  14. Perfil nutricional de crianças portadoras do transtorno do espectro autista

    Directory of Open Access Journals (Sweden)

    Maria Vanuza Caetano

    2018-02-01

    Full Text Available Objetivo: Avaliar o estado nutricional e o consumo alimentar de crianças portadoras do transtorno do espectro autista (TEA. Métodos: O estudo teve abordagem de natureza quantitativa, descritiva, exploratória e transversal. Participaram 26 crianças, de 3 a 10 anos de idade, com diagnóstico do TEA, de ambos os sexos, atendidas no município de Limoeiro do Norte, Ceará. Os dados foram coletados através de entrevistas, ordenadas por um questionário sociodemográfico (idade, renda familiar, escolaridade dos participantes, tratamento psicofarmacológico, idade recebida do diagnóstico do TEA, classificação da CID-10 e histórico clínico; histórico nutricional; aplicação de 3 recordatórios de 24 horas; e medidas antropométricas (peso, altura, circunferência do braço e as dobras cutâneas tricipital e subescapular, com posterior cálculo do índice de massa corporal (IMC. Utilizou-se análise descritiva e as variáveis contínuas foram expressas em média ± desvio padrão e coeficiente de variação. Resultados: Das crianças avaliadas, 10 (38,5% apresentaram sobrepeso (23,1%, n=6 e obesidade (15,38%, n=4 pelo IMC/I (Índice de Massa Corporal para Idade, bem como 10 crianças (38,5% apresentaram risco de sobrepeso. O consumo de energia (EER esteve acima do recomendado para 14 (53,85% dos autistas. Identificou-se inadequação no consumo de vitamina A (77%, n=20, vitamina B6 (58%, n=15 e cálcio (50%, n=13. Conclusão: As crianças com o TEA demonstram elevados índices de sobrepeso, obesidade e elevada inadequação na ingestão de vitaminas e minerais.

  15. CARACTERÍSTICAS PERINATAIS DE CRIANÇAS COM TRANSTORNO DO ESPECTRO AUTISTA

    Directory of Open Access Journals (Sweden)

    Gabriela Foresti Fezer

    Full Text Available RESUMO Objetivo: Analisar características perinatais de crianças com transtorno do espectro autista (TEA. Métodos: Revisão retrospectiva dos prontuários medicos de 75 crianças com TEA, entre janeiro de 2008 e janeiro de 2015. Os critérios de inclusão foram o diagnóstico de TEA baseado no DSM-5 e o termo de consentimento assinado pelo responsável legal. O critério de exclusão foi ausência de todos os dados no prontuário médico. As variáveis analisadas foram: idade materna, prematuridade (idade gestacional menor que 37 semanas, baixo peso ao nascer (<2.500 g e asfixia perinatal (Apgar menor que 7 no quinto minuto. Os dados foram avaliados por meio do teste de diferença entre as proporções (nível de significância de p<0,05. Resultados: Setenta e cinco pacientes foram incluídos no estudo. A idade materna variou de 21,4 a 38,6 anos (29,8±4,1 anos. O parto prematuro ocorreu em 14 (18,7% pacientes, asfixia perinatal em 6 (8,0% e baixo peso ao nascer em 32 (42,6%. As prevalências de prematuridade, asfixia perinatal e baixo peso ao nascer entre as crianças com TEA neste estudo foram maiores do que as prevalências gerais dessas condições entre todos os nascidos vivos em nosso país, região e estado, as quais são, respectivamente, 11,5, 2,3 e 8,5% no Brasil, 11,0; 2,2 e 8,5% na região Sul e 10,5, 2,0 e 8,4% no estado do Paraná. Conclusões: Nossos achados mostraram maior prevalência de prematuridade, baixo peso ao nascer e asfixia perinatal em crianças com TEA. Algumas limitações são o desenho retrospectivo do estudo e a amostra de pequeno tamanho. Grandes estudos prospectivos são necessários para esclarecer a possível associação entre intercorrências perinatais e TEA.

  16. Algunos aspectos del espectro Autista. Un trastorno inusitadamente frecuente y doloroso.

    Directory of Open Access Journals (Sweden)

    Daniel Jácome Roca

    2008-07-01

    Full Text Available

    El autismo (o espectro autista es un desorden neuro-conductual –hereditario y heterogéneo-
    del desarrollo del cerebro, que comienza en niños menores de tres años de edad y que deteriora
    su comunicación e interacción social causando un comportamiento restringido y repetitivo. Pueden jugar
    un papel en estos síndromes, algunas anormalidades cromosómicas. Las soluciones ni son simples ni
    uniformes en los diferentes síndromes, que algunas veces se asocian con patologías conocidas como el
    síndrome de Down, rubéola congénita, síndromes de Rett o de la X frágil, embriopatía por valproato, etc.
     
    Para hacer un diagnóstico de autismo, el DSM-IV –de la Asociación Americana de Psiquiatría- indica que es necesario encontrar las siguientes características:
    A. Un total de seis o más manifestaciones de (1, (2 y (3, con l menos dos de (1, al menos una
    de (2, y al menos una de (3.
    1. Trastorno cualitativo de la relación, expresado como mínimo en dos de las siguientes manifestaciones:
    a. Trastorno importante en muchas conductas de relación no verbal, como la mirada a los ojos, la
    expresión facial, las posturas corporales y los gestos para regular la interacción social.
    b. Incapacidad para desarrollar relaciones con iguales adecuadas al nivel de desarrollo.
    c. Ausencia de conductas espontáneas encaminadas a compartir placeres

  17. Personas con Trastorno del Espectro del Autismo con necesidades intensas y generalizadas de apoyo: estrategias para mejorar su calidad de vida

    Directory of Open Access Journals (Sweden)

    Ruth Vidriales Fernández

    2015-12-01

    Full Text Available Vidriales, R. et al. (2015: “Personas con Trastorno del Espectro del Autismo con necesidades intensas y generalizadas de apoyo: estrategias para mejorar su calidad de vida”, Revista Española de Discapacidad, 3 (2: 101-115.

  18. Precursores conductuales infantiles de los trastornos del espectro esquizofrénico : esquizofrenia y trastorno esquizotípico de la personalidad

    OpenAIRE

    Ballespí Sola, Sergi; Barrantes-Vidal, Neus; Obiols, Jordi E.

    1999-01-01

    Dada la extensa y creciente aparición de trabajos sobre marcadores bioconductuales de los trastornos del espectro esquizofrénico, hemos pretendido realizar una tarea de síntesis de los datos aportados y orientarla a la cuestión de posibles diferencias

  19. Espectro de gotas de pulverização e controle da ferrugem-asiática-da-soja em cultivares com diferentes arquiteturas de planta

    Directory of Open Access Journals (Sweden)

    Mônica Paula Debortoli

    2012-07-01

    Full Text Available O objetivo deste trabalho foi determinar o espectro de gotas de pulverização ideal para o controle da ferrugem-asiática-da-soja (Phakopsora pachyrhizi, em cultivares com diferentes arquiteturas de planta. O experimento foi conduzido na safra de 2009/2010. A aplicação de fungicida (piraclostrobina + epoxiconazol, com óleo mineral foi avaliada com quatro espectros de gotas de pulverização - muito fino, <119 μm; fino, 119 a 216 μm; médio, 217 a 352 μm; e grosso, 353 a 464 μm -, em quatro cultivares de soja (BMX Apollo RR, NA 7636 RR, Fcep 53 RR e TMG 4001 RR contrastantes quanto a índice de área foliar, estatura de plantas e número de ramos por planta. Foram quantificadas as variáveis: número de gotas por cm², diâmetro mediano volumétrico das gotas, área abaixo da curva de progresso da ferrugem-asiática e produtividade da soja. A definição do espectro de gotas a ser utilizado deve considerar a cultivar e as condições ambientais em que a pulverização será realizada. A magnitude da proteção exercida pelo fungicida varia de acordo com a cobertura de plantas e a penetração de gotas no dossel, proporcionada pelos diferentes espectros de gota. O espectro de gotas fino proporciona boa deposição de gotas, controle da doença e produtividade, independentemente da cultivar avaliada.

  20. La detección e intervención tempranas en menores con trastorno del espectro autista

    OpenAIRE

    Patricia GARCÍA PRIMO; Manuel POSADA DE LA PAZ; M.ª Victoria MARTÍN CILLEROS; José SANTOS BORBUJO; Gloria BUENO CARRERA; Ricardo CANAL BEDIA

    2015-01-01

    La importancia de la detección y de la intervención precoz en los trastornos del espectro autista (TEA) ha adquirido gran interés tanto para las sociedades profesionales como por la administración sanitaria. Con el propósito de facilitar la puesta en marcha de dispositivos de detección y de atención e intervención a edades tempranas de estos niños, es necesaria una información actualizada y sintetizada sobre los procedimientos de cribado y las técnicas de atención temprana para niños con TEA,...

  1. Presencia de B-lactamasas de espectro extendido en enterobacterias aisladas de casos de infección nosocomial

    Directory of Open Access Journals (Sweden)

    Sergio Pavón Romero

    2011-01-01

    Full Text Available Las enterobacterias son los microorganismos etiologicos mas frecuentemente asociados a las infecciones nosocomiales (in, caracterizandose por su alta resistencia a los antibioticos B-lactamicos, mediada por la produccion de B-lactamasas de Espectro Extendido (blee. Su uso excesivo aumenta la seleccion de cepas multirresistentes, favoreciendo su propagacion e incremento de las complicaciones de casos de in. En algunos casos las cepas productoras de blee presentan resistencia adicional a aminoglucosidos, quinolonas, tetraciclinas y trimetoprim-sulfametoxazol, reduciendo las opciones terapeuticas de las in. Con la finalidad de conocer localmente la magnitud de este problema, se estudiaron 87 cepas de enterobacterias aisladas de casos de in, encontrandose que el 26.43% son productoras de blee y en este caso fenotipicamente multirresistentes.

  2. Efecto de la sincronización rítmica en pacientes con Trastorno del Espectro Autista

    OpenAIRE

    Díaz, V.

    2017-01-01

    Las investigaciones realizadas en los últimos años ponen el énfasis en la relación existente entre las alteraciones sensoriales y del movimiento en los trastornos del espectro autista, adjudicando el déficit a una alteración a nivel cortical y a una disfunción cerebelosa temprana. Desde el campo de la musicoterapia, se ha abordado el déficit sensorio-motor a través de técnicas para la compensación y/o rehabilitación de funciones cognitivas. El propósito de este trabajo es presentar un abordaj...

  3. SOFTWARE EDUCATIVO PARA LA ENSEÑANZA DE COMPETENCIAS EMOCIONALES EN ALUMNADO CON TRASTORNOS DEL ESPECTRO AUTISTA

    Directory of Open Access Journals (Sweden)

    Josefina Lozano Martínez

    2011-01-01

    que utiliza un software educativo para alumnado con trastornos del espectro autista. Dos alumnos con trastorno autista y dos con síndrome de Asperger de educación primaria y secundaria participaron en un diseño de investigación colaborativa entre docentes universitarios y no universitarios a lo largo de dos cursos académicos. Tras el proceso de enseñanza, los alumnos mejoraron su rendimiento para superar tareas que evalúan la capacidad de reconocer y comprender emociones. Estos resultados pueden ser explicados por la organización del contenido, la presentación de las tareas y la estimulación y motivación que proporciona el uso del software educativo en la intervención educativa con alumnado con TEA.

  4. Spectra of Graphs

    NARCIS (Netherlands)

    Brouwer, A.E.; Haemers, W.H.

    2012-01-01

    This book gives an elementary treatment of the basic material about graph spectra, both for ordinary, and Laplace and Seidel spectra. The text progresses systematically, by covering standard topics before presenting some new material on trees, strongly regular graphs, two-graphs, association

  5. Spectra of alkali atoms

    International Nuclear Information System (INIS)

    Santoso, Budi; Arumbinang, Haryono.

    1981-01-01

    Emission spectra of alkali atoms has been determined by using spectrometer at the ultraviolet to infra red waves range. The spectra emission can be obtained by absorption spectrophotometric analysis. Comparative evaluations between experimental data and data handbook obtained by spark method were also presented. (author tr.)

  6. Reconstruction of Spectra Using X-ray Flat Panel Detector; Reconstruccion de Espectros de Rayos X Utilizando un Detector Flat Panel

    Energy Technology Data Exchange (ETDEWEB)

    Gallardo, S.; Querol, A.; Pozuelo, F.; Juste, B.; Rodenas, J.; Verdu, G.

    2013-07-01

    In this work, we used a flat panel detector with a wedge of PMMA for absorbed dose curve for given working conditions of X-ray tube The relationship between absorbed dose curve recorded by the flat panel and primary X-ray spectrum is defined by a response function that can be obtained using the Monte Carlo method, namely the MCNP5 code. However there are some problems that affect the applicability of this method such as: flat panel characteristics and the characteristics of the physical process (ill-conditioned problem). Both aspects are discussed in this paper.

  7. PROGRAMA PARA VISUALIZAÇÃO DE IMAGENS E ESPECTROS ASTRONÔMICOS DO TIPO FITS

    Directory of Open Access Journals (Sweden)

    Felipe Gonçalves de Toledo

    2015-03-01

    Full Text Available This work presents a proposal to manipulate astronomical images and spectra of type FITS format commonly used in astronomy. It generates a colored image of objects in space (stars, galaxies, nebulae, etc. with the concept of false color, from three gray scale images captured with different wavelength filters, and makes brief analysis of the electromagnetic spectrum to obtain some information, such as the composition and movement of the observed object. The software was developed in Java including some libraries to manipulate images, graphics and FITS file.

  8. Graphics of (X,Y) spectrum for microcomputer; Graficado de espectro (X,Y) para microcomputadora

    Energy Technology Data Exchange (ETDEWEB)

    Macias B, L.R

    1991-08-15

    When carrying out diffraction works is frequently required to visualize the spectra of the data obtained in order to analyzing them. The design for the obtaining of data in the neutron diffractometer by means of the microcomputer allows to store them in a file by means of the one which transferring to the CYBER system so that by means of its utilities the mentioned spectrum is observed in a graph. In diffraction works, it is sought to study crystalline materials by means of the execution of the Bragg law by that the mounted sample on the diffractometer is subjected to a scanning of the sample with a radiation of a well-known wavelength and this way varying the angles, the corresponding interplanar distances are determined. The main objective of this work, is starting of a data set generated by the diffractometer, to generate the graph of the corresponding (X,Y) spectra in visual form in the screen of a microcomputer and if it is required, to obtain the graph in printed form by means of the same computer program for microcomputer. (Author)

  9. Tabla de frecuencias y espectros de absorción infrarroja de compuestos relacionados con la química del cemento

    Directory of Open Access Journals (Sweden)

    Vázquez-Moreno, T.

    1981-06-01

    Full Text Available Not available

    En los núms. 175, 177 y 179 de esta Revista "Materiales de Construcción" se ha publicado un trabajo con el título "Aplicaciones prácticas de la espectroscopia de absorción infrarroja en el estudio de los crudos, del clinker y del cemento portland anhidro"; en él se decía textualmente que... "se dará, en forma de tablas las frecuencias y asignaciones correspondientes a los espectros IR tanto de los compuestos que se van estudiando como otros muchos que se consideran de interés. Asimismo se incluirán los respectivos espectros IR". A causa de la extensión y de las propias características del anexo, se consideró oportuno el publicarlo separadamente, incluso bajo un título más explicativo.

  10. Resistencia antimicrobiana en aislamientos clínicos de Klebsiella spp. y producción de B-lactamasas de espectro extendido en hospitales de Cuba

    OpenAIRE

    Quiñones Pérez, Dianelys; Carmona Cartaya, Yenisel; Zayas Illas, Arnaldo; Abreu Capote, Miriam; Salazar Rodriguez, Daniel; García Giro, Sandra; Torres Tamayo, Dalia; Kobayashi, Nobumichi; Valverde de Francisco, Aránzazu; del Campo Moreno, Rosa

    2014-01-01

    Introducción: el género Klebsiella causa brotes hospitalarios, por cepas multidrogorresistentes en diferentes continentes y conlleva a un aumento en la morbimortalidad. Objetivos: identificar las especies de Klebsiella causantes de infecciones en hospitales cubanos, determinar la procedencia de los aislamientos según el servicio, y la susceptibilidad antimicrobiana, conocer la prevalencia de aislamientos productores de ß-lactamasas de espectro extendido (BLEE), y tipos, así como la susceptibi...

  11. Aplicación de los métodos mecanocuánticos al espectro de emisión del Ca I

    OpenAIRE

    C. Blume; M. Ewert

    2009-01-01

    Hemos reestudiado las asignaciones del espectro de emisióndel Ca I mediante el cálculo de los valores de las integrales radialesF(k), G(k) y f(n, 1) a partir de los valores experimentales paratodas las series con un número suficiente de términos. En general,las asignaciones de Moore están en mejor acuerdo que las de Risbergcon las previsiones teóricas.

  12. Aplicación de los métodos mecanocuánticos al espectro de emisión del ca i

    OpenAIRE

    Blume, C.; Ewert, M.

    2009-01-01

    Hemos reestudiado las asignaciones del espectro de emisióndel Ca I mediante el cálculo de los valores de las integrales radialesF(k), G(k) y f(n, 1) a partir de los valores experimentales paratodas las series con un número suficiente de términos. En general,las asignaciones de Moore están en mejor acuerdo que las de Risbergcon las previsiones teóricas.

  13. Líneas ciclo trónicas en el espectro de rayos y pulsado

    Directory of Open Access Journals (Sweden)

    Jorge Paez

    2016-03-01

    Full Text Available If the magnetic Bremsstrahlung process is responsable for the lines observes in the spectra of two y-ray bursts, GB880205 and GB870303 detected by the spectrometer of the GINGA satelite, then the fundamental and primary harmonics (transition between the excited Landau levels N=2,1 to the ground-state N´=0 may be identified as the cause of those features detected in those y-ray bursts. We use the transition rate for this process in order to prove our asseveration. We suppose that this process is occurring under the presence of an external magnetic field of order 2*10 12 Gauss. The numerical results for the energy average of the emitted photons are: 22.41 Kev and 43.86 Kev. These energies correspond to the fundamental and primary harmonics transition respectively. Subjet headings: y-rays- magnetic fields- radiation mechanisms.

  14. Solar Energetic Particle Spectra

    Science.gov (United States)

    Ryan, J. M.; Boezio, M.; Bravar, U.; Bruno, A.; Christian, E. R.; de Nolfo, G. A.; Martucci, M.; Mergè, M.; Munini, R.; Ricci, M.; Sparvoli, R.; Stochaj, S.

    2017-12-01

    We report updated event-integrated spectra from several SEP events measured with PAMELA. The measurements were made from 2006 to 2014 in the energy range starting at 80 MeV and extending well above the neutron monitor threshold. The PAMELA instrument is in a high inclination, low Earth orbit and has access to SEPs when at high latitudes. Spectra have been assembled from these high-latitude measurements. The field of view of PAMELA is small and during the high-latitude passes it scans a wide range of asymptotic directions as the spacecraft orbits. Correcting for data gaps, solid angle effects and improved background corrections, we have compiled event-integrated intensity spectra for twenty-eight SEP events. Where statistics permit, the spectra exhibit power law shapes in energy with a high-energy exponential roll over. The events analyzed include two genuine ground level enhancements (GLE). In those cases the roll-over energy lies above the neutron monitor threshold ( 1 GV) while the others are lower. We see no qualitative difference between the spectra of GLE vs. non-GLE events, i.e., all roll over in an exponential fashion with rapidly decreasing intensity at high energies.

  15. Medidas directas e indirectas de las funciones ejecutivas en niños con trastorno de espectro autista

    Directory of Open Access Journals (Sweden)

    María Fernanda Pérez Pichardo

    2018-01-01

    Full Text Available INTRODUCCIÓN: los niños con trastorno del espectro autista (TEA tienen dificultades en las funciones ejecutivas (FE pero se han sugerido discrepancias entre las medidas directas e indirectas.   OBJETIVO: conocer si existen diferencias en las funciones ejecutivas mediante medidas directas e indirectas entre niños con y sin TEA.   MÉTODO: se incluyeron 14 varones entre primero y tercero de primaria, 50% con diagnóstico de TEA y 50% con desarrollo neurotípico, seleccionados por emparejamiento en edad y grado escolar. El promedio de edad de la muestra fue de 7.43 (DE 0.98 años. Se aplicaron las pruebas de Evaluación neuropsicológica de funciones ejecutivas en niños (ENFEN y el Inventario de clasificación comportamental de las funciones ejecutivas (BRIEF.   RESULTADOS: se encontraron diferencias significativas en las medidas de las FE indirectas, pero no en las directas, entre los grupos (p < 0.05. Así mismo, las correlaciones entre las medidas directas e indirectas fueron mayores en el grupo con TEA.   CONCLUSIONES: los niños con TEA son evaluados con más dificultades en las medidas indirectas de las funciones ejecutivas, pero obtienen puntuaciones similares a los niños con desarrollo neurotípico cuando son evaluados en condiciones estructuradas empleando medidas directas.

  16. Inclusão escolar de estudantes com transtorno do espectro autista (TEA no ensino fundamental II

    Directory of Open Access Journals (Sweden)

    Relma Urel Carbone Carneiro

    2017-11-01

    Full Text Available Este estudo apresenta uma reflexão sobre a inclusão escolar de alunos com Transtorno do Espectro Autista TEA, clientela pertencente ao público alvo da Educação Especial, discutindo essa realidade no Ensino Fundamental II. Apresenta uma visão geral sobre o TEA e a análise de uma entrevista semiestruturada realizada com um professor que possuía um aluno com TEA, verificando qual sua visão sobre seu papel e como o aluno é visto e trabalhado na escola.  Utilizamos uma abordagem qualitativa de pesquisa e como procedimento metodológico o Estudo de Caso. Buscamos verificar como tem se dado a inclusão nesta realidade. Após a análise dos dados constatou-se que ainda há muitos aspectos que devem ser mudados para que ocorra uma inclusão efetiva, principalmente na formação do grupo gestor, dos docentes, e inciativas governamentais, a fim de que a inclusão seja sinônimo de desenvolvimento e aprendizagem significativos.

  17. Intervención psicoeducativa en alumnos con trastornos del espectro del autismo en educación primaria

    Directory of Open Access Journals (Sweden)

    Alvaro Bejarano Martín

    2017-12-01

    Full Text Available Aunque existen intervenciones psicoeducativas basadas en investigaciones para alumnado con trastornos del espectro autista (TEA validadas empíricamente, muchos maestros y especialistas a menudo carecen de los conocimientos, capacidades y oportunidades necesarias para aplicarlos de forma correcta (Simpson, 2004; Sack-Min, 2008. El objetivo de este estudio es determinar el conocimiento y aplicación que tienen los profesionales que trabajan con alumnado con TEA sobre estos programas. En base a revisiones sistemáticas actuales sobre intervenciones en TEA se desarrolló una lista de programas basada en los diferentes niveles de evidencia empírica. En función a esta lista y al estudio de Hess et al. (2008 se creó un cuestionario para recoger datos sobre el conocimiento y aplicación de dichos programas. Los resultados muestran que los profesionales de centros de educación especial conocen y aplican programas de intervención adecuados, no encontrándose diferencias en el conocimiento de programas entre maestros de pedagogía terapéutica, pero sí en su aplicación. Un aumento de redes de colaboración entre centros, así como formación a través de asociaciones y servicios sería de esencial interés para trasladar conocimiento y experiencias a centros con menos recursos.

  18. La inclusión de un estudiante con trastorno del espectro autista en educación superior

    Directory of Open Access Journals (Sweden)

    Silvia Estela Yon Guzmán

    2018-02-01

    Full Text Available Mediante un estudio etnográfico se describe y analiza el proceso para sensibilizar a docentes y estudiantes universitarios en torno a la inclusión de un estudiante con la condición de Trastorno del Espectro Autista (TEA, en la Universidad Autónoma del Carmen, Campeche. Participaron el estudiante, docentes y estudiantes del 1er semestre de la licenciatura de Comunicación y Gestión Cultural y del 5to semestre de la Licenciatura en Educación. Se utilizó la entrevista abierta, la observación participante, y un taller donde se abordó los conceptos, fundamentos, características y estrategias del TEA. La metodología empleada permitió comprender el funcionamiento del estudiante con TEA, considerar las teorías que lo fundamentan, que confirman las debilidades y fortalezas en las personas con esta condición, identificar las necesidades del estudiante, sensibilizar y proponer estrategias para minimizar las barreras para el aprendizaje y la participación que favorezcan la inclusión en las IES. El taller de sensibilización puede ser una acción a desarrollar en las instituciones de educación superior para favorecer la inclusión, para lo cual se deben considerar las condiciones del contexto y las particularidades de los estudiantes.

  19. Parameterization of rotational spectra

    International Nuclear Information System (INIS)

    Zhou Chunmei; Liu Tong

    1992-01-01

    The rotational spectra of the strongly deformed nuclei with low rotational frequencies and weak band mixture are analyzed. The strongly deformed nuclei are commonly encountered in the rare-earth region (e. g., 150 220). A lot of rotational band knowledge are presented

  20. Atomic Spectra Database (ASD)

    Science.gov (United States)

    SRD 78 NIST Atomic Spectra Database (ASD) (Web, free access)   This database provides access and search capability for NIST critically evaluated data on atomic energy levels, wavelengths, and transition probabilities that are reasonably up-to-date. The NIST Atomic Spectroscopy Data Center has carried out these critical compilations.

  1. X-ray absorption spectra and emission spectra of plasmas

    International Nuclear Information System (INIS)

    Peng Yonglun; Yang Li; Wang Minsheng; Li Jiaming

    2002-01-01

    The author reports a theoretical method to calculate the resolved absorption spectra and emission spectra (optically thin) of hot dense plasmas. Due to its fully relativistic treatment incorporated with the quantum defect theory, it calculates the absorption spectra and emission spectra for single element or multi-element plasmas with little computational efforts. The calculated absorption spectra of LTE gold plasmas agree well with the experimental ones. It also calculates the optical thin emission spectra of LTE gold plasmas, which is helpful to diagnose the plasmas of relevant ICF plasmas. It can also provide the relevant parameters such as population density of various ionic stages, precise radiative properties for ICF studies

  2. Lattice vibration spectra. 16

    International Nuclear Information System (INIS)

    Lutz, H.D.; Willich, P.

    1977-01-01

    The FIR absorption spectra of pyrite type compounds RuS 2 , RuSsub(2-x)Sesub(x), RuSe 2 , RuTe 2 , OsS 2 , OsSe 2 , and PtP 2 as well as loellingite type phosphides FeP 2 , RuP 2 , and OsP 2 are reported. For RuS 2 , RuSe 2 , RuTe 2 , OsS 2 , and PtP 2 all of the five infrared allowed modes (k = 0) are observed. As a first result of a numerical normal coordinate treatment vibration forms of pyrite structure are communicated. The spectra show that lattice forces of corresponding sulfides, tellurides, and phosphides are about the same strength, but increase strongly by substitution of iron by ruthenium and especially of ruthenium by osmium. The lattice constants of the RuSsub(2-x)Sesub(x) solid solution obey Vegard's rule. (author)

  3. Deconvoluting double Doppler spectra

    International Nuclear Information System (INIS)

    Ho, K.F.; Beling, C.D.; Fung, S.; Chan, K.L.; Tang, H.W.

    2001-01-01

    The successful deconvolution of data from double Doppler broadening of annihilation radiation (D-DBAR) spectroscopy is a promising area of endeavour aimed at producing momentum distributions of a quality comparable to those of the angular correlation technique. The deconvolution procedure we test in the present study is the constrained generalized least square method. Trials with computer simulated DDBAR spectra are generated and deconvoluted in order to find the best form of regularizer and the regularization parameter. For these trials the Neumann (reflective) boundary condition is used to give a single matrix operation in Fourier space. Experimental D-DBAR spectra are also subject to the same type of deconvolution after having carried out a background subtraction and using a symmetrize resolution function obtained from an 85 Sr source with wide coincidence windows. (orig.)

  4. Spectra, Winter 2014

    Science.gov (United States)

    2014-01-01

    additional copies or more information, please email spectra@nrl.navy.mil. LEADINGEDGE 1 Contents 30 Navy Launches UAV from Submerged Submarine 31... multitasking have become mainstream concerns. For example, the New York Times in 2005 and Time magazine in 2006 both reported stories about...interruptions and multitasking , and how they affect performance by increasing human er- ror. In 2005, the information technol- ogy research firm Basex

  5. Thermoluminescence spectra of amethyst

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Q. [Suzhou Railway Teachers College (China). Dept. of Physics; Yang, B. [Beijing Normal University (China). Dept. of Physics; Wood, R.A.; White, D.R.R.; Townsend, P.D.; Luff, B.J. [Sussex Univ., Brighton (United Kingdom). School of Mathematical and Physical Sciences

    1994-04-01

    Thermoluminescence and cathodoluminescence data from natural and synthetic amethyst and synthetic quartz samples are compared. The spectra include features from the quartz host lattice and from impurity-generated recombination sites. Emission features exist throughout the wavelength range studied, 250-800 nm. The near infrared emission at 740-750 nm appears to be characteristic of the amethyst and is proposed to be due to Fe ion impurity. (Author).

  6. Auger spectra of alkanes

    International Nuclear Information System (INIS)

    Rye, R.R.; Jennison, D.R.; Houston, J.E.

    1980-01-01

    The gas-phase Auger line shapes of the linear alkanes C 1 through C 6 and of neopentane are presented and analyzed. The general shape of the spectra are characteristic of carbon in a tetrahedral environment with the major feature in all cases occurring at approx.249 eV. The relatively large spectral changes found between methane and ethane results from the direct interaction of the terminal methyl groups in ethane, and the spectra of the higher alkanes are shown to be a composite of contributions from terminal methyl and interior methylene group carbon atoms. Theoretical analysis based on a one-electron approximation is shown to be capable of making a molecular orbital assignment by comparing calculated vertical transitions to features in the Auger spectra of ethane and propane, and, in the case of ethane, of differentiating between the 2 E/sub g/ and 2 A/sub 1g/ assignment of the ground state of (C 2 H 6 ) + . A one-electron based molecular orbital treatment, however, is shown to partially break down in propane and neopentane. Analysis of neopentane and the observed absence of any noticeable major peak energy shift with increasing molecular size (as predicted by the one-electron treatment) suggests that some Auger final states occur in which both valence holes are localized on the same subunit of the molecule

  7. Pattern recognition in spectra

    International Nuclear Information System (INIS)

    Gebran, M; Paletou, F

    2017-01-01

    We present a new automated procedure that simultaneously derives the effective temperature T eff , surface gravity log g , metallicity [ Fe/H ], and equatorial projected rotational velocity v e sin i for stars. The procedure is inspired by the well-known PCA-based inversion of spectropolarimetric full-Stokes solar data, which was used both for Zeeman and Hanle effects. The efficiency and accuracy of this procedure have been proven for FGK, A, and late type dwarf stars of K and M spectral types. Learning databases are generated from the Elodie stellar spectra library using observed spectra for which fundamental parameters were already evaluated or with synthetic data. The synthetic spectra are calculated using ATLAS9 model atmospheres. This technique helped us to detect many peculiar stars such as Am, Ap, HgMn, SiEuCr and binaries. This fast and efficient technique could be used every time a pattern recognition is needed. One important application is the understanding of the physical properties of planetary surfaces by comparing aboard instrument data to synthetic ones. (paper)

  8. DESARROLLO DE UN SISTEMA DE MONITOREO DE RADIACIÓN SOLAR BASADO EN UN ESPECTRÓMETRO DE AMPLIO ESPECTRO

    Directory of Open Access Journals (Sweden)

    Faviola Romero

    2011-01-01

    Para la construcción mecánica del sistema, se utilizaron perfiles de aluminio de 60x30 mm. Esta estructura metálica sujeta a una fibra óptica de cuarzo lleva la radiación solar al espectrómetro Ocean Optics USB4000 (200-900 nm. La electrónica del sistema de control, está gobernada por un microcontrolador Arduino UNO, el cual se encarga de sincronizar el movimiento de dos motores PAP bipolares y la toma de datos en el espectrómetro que se activa con un trigger externo. La característica principal del sistema es permitir la medición del espectro de los componentes global y difuso de la radiación solar en diferentes ángulos de incidencia. El sistema mecánico ajusta un extremo de una fibra óptica de 0 a 90 grados en dirección norte, cada nueve grados, midiendo la radiación global y mediante una banda mecánica que produce sombra sobre la fibra óptica, mide la radiación difusa. Las medidas son tomadas cada hora y el rango espectral abarcado es del UVA, VIS y parte del IR cercano. Se realizaron pruebas preliminares en dos ciudades de Bolivia y se demostró que la cantidad de radiación UVA es mayor en el El Alto (4062 msnm, la ciudad con mayor elevación, en comparación con Cochabamba que se encuentra a 2570 msnm.

  9. El alumnado con trastorno de espectro autista en los centros educativos: un estudio de casos desde la perspectiva familiar

    Directory of Open Access Journals (Sweden)

    Javier Cortés Moreno

    2017-11-01

    Full Text Available Resumen. Actualmente en el ámbito educativo, el alumnado con algún tipo de discapacidad puede llegar a considerarse como un grupo vulnerable de población debido a las carencias inclusivas que existen en los centros educativos. El conocimiento parcial sobre los Trastornos de Espectro Autista (en adelanta, TEA, por parte de la comunidad educativa, dificulta la comprensión sobre la atención que precisa este alumnado en su etapa de aprendizaje. Esta investigación trata de determinar qué dificultades han experimentado los familiares de este alumnado en los centros educativos de sus menores, al mismo tiempo que persigue conocer cuál es el nivel de satisfacción que tienen las familias con la respuesta recibida desde el ámbito educativo. La metodología que se ha empleado ha sido cualitativa, mediante un estudio de casos que ha utilizado la técnica de entrevistas en profundidad enfocadas a los familiares del alumnado con TEA. La muestra se ha establecido mediante muestreo intencional y han participado un total de 30 sujetos, de los cuales 19 son madres y 11 padres de menores con TEA. En definitiva, el artículo presenta un informe de los resultados que se han obtenido en la investigación realizada en la provincia de Jaén (España en relación a las percepciones y experiencias que han tenido los familiares del alumnado con TEA sobre las distintas vulnerabilidades que tienen sus menores en los centros educativos. La totalidad de la muestra coincide que resulta insuficiente la atención especializada que se ofrece desde los centros educativos.

  10. La detección e intervención tempranas en menores con trastorno del espectro autista

    Directory of Open Access Journals (Sweden)

    Patricia GARCÍA PRIMO

    2015-12-01

    Full Text Available La importancia de la detección y de la intervención precoz en los trastornos del espectro autista (TEA ha adquirido gran interés tanto para las sociedades profesionales como por la administración sanitaria. Con el propósito de facilitar la puesta en marcha de dispositivos de detección y de atención e intervención a edades tempranas de estos niños, es necesaria una información actualizada y sintetizada sobre los procedimientos de cribado y las técnicas de atención temprana para niños con TEA, reflejando los aspectos más relevantes que se deduzcan de las experiencias y estudios llevados a cabo hasta el momento. Tras la revisión realizada en nuestro estudio sobre las experiencias de detección precoz de autismo, se obtiene un grupo de consideraciones importantes, para realizar análisis críticos de programas de cribado en marcha así como recomendaciones para experiencias futuras. Así mismo, la revisión de los estudios sobre la eficacia de los programas de atención temprana nos proporciona una visión esperanzadora, indicando que éstos son cada vez más frecuentes, sistemáticos y metodológicamente más apropiados. Llevamos mucho camino recorrido, pero aún queda mucho por hacer.

  11. Análisis del procesamiento local y global en adolescentes con trastorno del espectro autista de alto funcionamiento (síndrome de Asperger)

    OpenAIRE

    Blázquez Garcés, Juan Vicente

    2017-01-01

    El síndrome de Asperger (SA), actualmente incluido en el Trastorno del Espectro Autista (TEA), es el perfil cognitivo dentro del autismo que más cercano se encuentra al perfil de desarrollo típico, debido a que no muestra deterioro intelectual ni del lenguaje (a excepción de los procesos más complejos). La adolescencia es un período del desarrollo en el que la maduración física y sexual así como los cambios psicológicos y sociales se van dando progresivamente en la persona, que abandona la in...

  12. Adaptación psicológica en madres y padres de personas con trastornos del espectro autista : un estudio multidimensional

    OpenAIRE

    Pozo Cabanillas, María del Pilar

    2010-01-01

    Esta tesis tiene como objetivo principal el análisis multidimensional de la adaptación psicológica de las madres y padres que tienen hijos con trastornos del espectro autista (TEA). La tesis se sustenta en los resultados de tres estudios empíricos: a) un estudio multidimensional del estrés en las madres; b) un estudio más complejo en madres y padres, examinando como adaptación tanto variables negativas (estrés, ansiedad, depresión) como positivas (bienestar psicológico y calidad de vida famil...

  13. Identificação precoce do Transtorno do Espectro Autista por meio da Puericultura em uma Unidade Básica de Saúde

    OpenAIRE

    Murari, Silvia Cristiane

    2014-01-01

    O Transtorno do Espectro Autista (TEA) é um transtorno sem etiologia definida. As variáveis que o determinam relacionam-se com a história de vida da criança, principalmente, intercorrências médicas e das interações sociais. O grau de seu comprometimento depende, em parte, do quão precocemente os primeiros sinais de seu desenvolvimento são detectados e de a criança ser encaminhada, o quanto antes, para tratamento adequado. Os primeiros profissionais a terem contado com a criança...

  14. Fluorescencia molecular. Fundamentos teóricos. Obtención de espectros y análisis de una sustancia fluorescente

    OpenAIRE

    Espada Bellido, Estrella; Mendiguchía Martínez, Carolina; López López, José Antonio; Pinto, Juan J.

    2012-01-01

    En este video se explican detalladamente los fundamentos teóricos de la fluorescencia molecular, la disposición de cada uno de los componentes dentro un espectrofluorímetro mostrando las diferencias con respecto a un espectrofotómetro. Por otro lado, se muestran los distintos pasos para obtener los espectros de excitación y emisión, así como las etapas a llevar a cabo en el análisis de una sustancia fluorescente como la quinina.

  15. Atención a menores con trastorno del espectro autista. Una propuesta de atención integral e integradora en un modelo comunitario

    OpenAIRE

    Iglesias Mateos, Sara

    2017-01-01

    El Trastorno del Espectro Autista es un trastorno neurológico que abarca numerosos síntomas. Estos síntomas no se presentan con la misma incidencia en todos aquellos que lo padecen. Tampoco aparece el mismo número de síntomas, ni concurren siempre de manera conjunta. Es por ello que la intervención debe ser individual y estar adaptada a sus características tanto personales como socioculturales. Este trabajo se presenta como una propuesta de intervención desde una perspectiva comunitaria...

  16. Trastorno del espectro autista y trastorno específico del lenguaje ¿Dos entidades diferentes o un continuo de manifestaciones neuropsicológicas?

    OpenAIRE

    Newra Tellechea Rotta

    2013-01-01

    El estudio de los niños con retraso en el desarrollo del lenguaje amerita un gran conocimiento del desarrollo neurológico típico; muchas veces, niños con retraso del lenguaje pueden presentar dificultades sociales y conductuales y puede ser difícil, en especial en etapas tempranas, diferenciar entre trastorno del espectro autista (TEA) y trastorno específico del lenguaje (TEL). Justamente por ello, teniendo en cuenta que muchas veces comparten síntomas comunes se ha postulado que estos trasto...

  17. Consecuencias del cuidado de personas con Trastorno del Espectro Autista sobre la salud de los cuidadores: estado actual de la cuestión

    OpenAIRE

    Ruiz Robledillo, Nicolás; Antón-Torres, P.; González Bono, Esperanza; Moya Albiol, Luis

    2012-01-01

    Los Trastornos del Espectro Autista (TEA) conforman un grupo de trastornos caracterizados por la aparición de problemas en la socialización, dificultades en la comunicación y el desarrollo de patrones e intereses restringidos. Esta sintomatología suele asociarse con diversos problemas de conducta, factores que han mostrado una gran relevancia a la hora de explicar las consecuencias del cuidado sobre el estado de salud de los cuidadores. Sin embargo, esta relación se ve modulada por diversas v...

  18. Guía de Intervención para el Desarrollo Comunicativo - Lingüístico de los alumnos con Trastorno Del Espectro Autista

    OpenAIRE

    Escribano Tébar, Inmaculada

    2015-01-01

    El presente Trabajo Fin de Grado está basado en el estudio de los Trastornos del Espectro Autista (TEA). Se realiza una revisión bibliográfica sobre el tema utilizando libros, artículos, guías y otras fuentes relacionadas con el tema, los cuales se pueden ver reflejados en la bibliografía de este trabajo. A partir de este estudio, se pretende que pueda servir de guía de intervención sobre alumnos con TEA pertenecientes al segundo ciclo de Educación Infantil y dirigida principalmente a maes...

  19. Implicaciones clínicas y asistenciales de la nueva clasificación DSM 5 para trastorno del espectro autistas

    OpenAIRE

    Romero González, Marina

    2015-01-01

    OBJETIVOS 1. Estudiar el cumplimiento de los nuevos criterios diagnósticos para Trastorno del Espectro Autista recogidos en el DSM 5 en una muestra de pacientes escolarizados y diagnosticados de Trastorno General del Desarrollo del DSM IV-TR. 2. Estudiar la clasificación de los diferentes subtipos en pacientes diagnosticados con Trastorno General del Desarrollo del DSM IV-TR (Autismo, Síndrome de Asperger y Trastorno general no especificado) entre los pacientes que cumplían los crite...

  20. La musicoterapia como una vía de expresión y comunicación en el Trastorno del Espectro Autista

    OpenAIRE

    Sánchez Martínez, Elías

    2017-01-01

    El TFG en cuestión es una revisión teórica que trata dos temas fundamentalmente, estos son: el Trastorno del Espectro Autista, definición, criterios...etc, y la musicoterapia como medida terapeútica válida para este trastorno. Este documento recoge teorías y estudios que avalan los notables beneficios del uso terapeútico de la música, en especial en las personas que presentan TEA, produciendo cambios significativos en el ámbito social, emociona y académico.

  1. Modalidades de difusión de la discapacidad : El rol de los actores en relación con el Trastorno del Espectro Autista

    OpenAIRE

    Lucero, Silvana Isabel

    2014-01-01

    El trabajo que se propone presenta la intervención que adoptan los medios masivos de comunicación y las organizaciones sociales en relación con la temática de la discapacidad, específicamente del Trastorno del Espectro Autista. Para ello, hemos tomado en principio la decisión de hacer un recorrido histórico por las legislaciones sobre discapacidad existentes en la Argentina, para luego continuar con la caracterización de los portales gráficos y de las organizaciones sociales seleccionados, in...

  2. Estudio preliminar de PEP-3 como instrumento de evaluación funcional de niños con Trastorno del Espectro Autista

    OpenAIRE

    Orobal Císcar, Paloma

    2013-01-01

    En el presente estudio, además de traducir, adaptar lingüísticamente y realizar una aplicación preliminar de un instrumento de evaluación funcional del Trastorno del Espectro Autista (TEA) llamado PEP-3 (Perfil Psicoeducativo-3ªEdición); se han realizado dos aplicaciones del instrumento a un grupo de 10 niños y niñas con TEA atendidos en un Centro de Atención Temprana de Valencia con el objetivo de analizar la sensibilidad del instrumento para medir cambios tras tres meses de intervención bas...

  3. Influencia de las Redes Sociales en la Integración Social de jóvenes con Trastornos del Espectro Autista.

    OpenAIRE

    Legorburu-Fernández, Idoia

    2013-01-01

    El presente estudio versa sobre la influencia que ejercen las Redes Sociales (RRSS) en la socialización de las personas con Trastorno del Espectro Autista (TEA). Se investiga si mediante las nuevas herramientas existentes en la red los jóvenes con TEA podrían mejorar sus lazos sociales. Más concretamente, tiene como objeto conocer el uso que le dan dichos alumnos a las plataformas sociales, para poder optimizar, posteriormente, las metodologías que utilizan los profesionales en el entrenamien...

  4. Host range findings on Beauveria bassiana and Metarhizium anisopliae (Ascomycota: Hypocreales in Argentina Espectro de hospedadores hallado en Beauveria bassiana y Metarhizium anisopliae (Ascomycota: Hypocreales en Argentina

    Directory of Open Access Journals (Sweden)

    A. V. Toledo

    2008-12-01

    Full Text Available The natural insect host range of the entomopathogenic fungi (EPF Beauveria bassiana (Bb and Metarhizium anisopliae (Ma was investigated in Argentina during the winter of 2003 through spring of 2004. Fungi- infected insect samples (153 were collected from cornfields and the surrounding uncultivated areas in different localities of Buenos Aires (7, Tucumán (2, and Corrientes (3 provinces. The rates of Bb-infected host range varied among the Coleoptera (37%, Hemiptera (27% and Dermaptera (1.3%. While the rates of Ma-infected host range varied between the Coleoptera (0.7% and Hemiptera (34%. The greater host range resulted with B. bassiana found from eight species of Coleoptera (four families, one species of Dermaptera and four species of Hemiptera (three families, than the host range of M. anisopliae found infecting one species of Coleoptera and three species of Hemiptera (two families. We obtained 75 pure fungal isolates (48 Bb-isolates and 27 to Ma-isolates, and 56 of them (33 Bb-isolates and 23 Ma-isolates were morphologically characterized.El espectro natural de hospedadores de los hongos entomopatógenos (HEP Beauveria bassiana (Bb y Metarhizium anisopliae (Ma fue investigado en Argentina desde el invierno de 2003 hasta la primavera de 2004. Las muestras de insectos con infecciones fúngicas (153 fueron recolectadas a partir de campos de maíz y las áreas no cultivadas circundantes a los mismos, en diferentes localidades de las provincias de Buenos Aires (7, Tucumán (2 y Corrientes (3. El espectro de hospedadores infectados con Bb varió entre los Coleoptera (37%, Hemiptera (27% y Dermaptera (1,3%. Mientras que el espectro de hospedadores infectados con Ma varió entre los Coleoptera (0,7% y los Hemiptera (34%. El mayor espectro lo presentó Bb, encontrado en ocho especies de Coleoptera (cuatro familias, una especie de Dermaptera y cuatro especies de Hemiptera (tres familias, mientras que Ma fue encontrado infectando una especie de

  5. Aplicación de los métodos mecanocuánticos al espectro de emisión del Ca I

    Directory of Open Access Journals (Sweden)

    C. Blume

    2009-07-01

    Full Text Available Hemos reestudiado las asignaciones del espectro de emisióndel Ca I mediante el cálculo de los valores de las integrales radialesF(k, G(k y f(n, 1 a partir de los valores experimentales paratodas las series con un número suficiente de términos. En general,las asignaciones de Moore están en mejor acuerdo que las de Risbergcon las previsiones teóricas.

  6. Deconvolution of Positrons' Lifetime spectra

    International Nuclear Information System (INIS)

    Calderin Hidalgo, L.; Ortega Villafuerte, Y.

    1996-01-01

    In this paper, we explain the iterative method previously develop for the deconvolution of Doppler broadening spectra using the mathematical optimization theory. Also, we start the adaptation and application of this method to the deconvolution of positrons' lifetime annihilation spectra

  7. Vibrational spectra of aminoacetonitrile

    International Nuclear Information System (INIS)

    Bak, B.; Hansen, E.L.; Nicolaisen, F.M.; Nielsen, O.F.

    1975-01-01

    The preparation of pure, stable aminoacetonitrile(1-amino, 1'-cyanomethane)CH 2 NH 2 CN (1) is described. The Raman spectrum, now complete, and a novel infrared spectrum extending over the 50-3600 cm -1 region are reported. A tentative normal vibration analysis is presented and supported by Raman and infrared data from the spectra of CH 2 NHDCN (2) and CH 2 ND 2 CN (3). The predominance of the trans rotamer may be attributed to intramolecular hydrogen bonding but this is too unimportant to influence the vibrational frequencies of gaseous 1, 2, and 3. However, large gas/liquid frequency shifts occur. (author)

  8. Comunicação, vigilância e infraestrutura: tecnopolíticas do espectro eletromagnético | Communication, surveillance and infrastructure: techno-politics of the electromagnetic spectrum

    Directory of Open Access Journals (Sweden)

    Adriano Belisário

    2016-11-01

    Full Text Available RESUMO Este trabalho analisa algumas dinâmicas técnicas e políticas em torno dos usos e aplicações do espectro eletromagnético. Argumentando que a vigilância é parte intrínseca do desenvolvimento de certo modelo e arquitetura tecnológica em um nível infraestrutural, exploramos conceitos e práticas que buscam novas perspectivas de entendimento e ação dentro dessa camada essencial para os processos de comunicação que é o espectro. Iniciamos apresentando o espectro radioelétrico e seu gerenciamento para em seguida debater a noção de “espectro aberto” e seus usos mais recentes. Ao final, apresentamos exemplos que ilustram concepções alternativas técnicas e políticas por meio da noção de “espectro livre”. Palavras-Chave: Vigilância; Comunicação; Rádio; Espectro Eletromagnético; Tecnologia. ABSTRACT This paper examines technical and political dynamics around the uses and applications of the electromagnetic spectrum. Arguing that surveillance is an intrinsic part of the development of a certain technological model and architecture at an infrastructural level, we explore concepts and practices that seek new prospects for understanding and acting in this essential layer for communication processes that is the spectrum. We begin presenting the radio spectrum and its management to then discuss the notion of 'open spectrum' and its most recent uses. At the end, we present examples that illustrate alternative technical and political conceptions by means of the notion of a "free spectrum". Keywords: Surveillance; Communication; Radio, Electromagnetic Spectrum; Technology.

  9. Espectro óculo-aurículo-vertebral em pacientes com defeitos cardíacos congênitos

    Directory of Open Access Journals (Sweden)

    Rafael Fabiano Machado Rosa

    2010-10-01

    Full Text Available FUNDAMENTO: Há poucos estudos avaliando a frequência do espectro óculo-aurículo-vertebral (EOAV nos pacientes com defeitos cardíacos congênitos (DCC. OBJETIVO: Verificar a frequência do EOAV em uma amostra de pacientes com malformações cardíacas graves. MÉTODOS: Avaliamos uma coorte prospectiva de pacientes com DCC, admitidos em uma unidade de terapia intensiva (UTI cardiopediátrica no Brasil. O diagnóstico de EOAV foi feito com base em dados clínicos, considerando critérios padrões. Os pacientes que preenchiam esses critérios foram submetidos ao cariótipo de alta resolução com bandamento GTG e hibridização fluorescente in situ para a microdeleção 22q11.2. O teste exato de Fisher (P < 0,05 foi usado para as análises estatísticas. RESULTADOS: Durante o período de avaliação, 330 pacientes foram hospitalizados pela primeira vez na UTI, mas trinta deles não participaram deste estudo. Dos 300 pacientes que constituíram a amostragem final, o EOAV foi verificado em três casos (1%. Todos apresentaram estudos citogenéticos normais. CONCLUSÃO: O EOAV parece ser uma condição frequente em pacientes com DCC. Contudo, não podemos excluir a possibilidade de que a frequência de EOAV encontrada em nosso estudo possa ter sido subestimada devido à baixa taxa de detecção pré-natal de DCC e ao acesso limitado dos pacientes ao tratamento médico apropriado em nosso meio. Estudos prospectivos futuros com critérios clínicos bem definidos e pacientes com defeitos leves e graves serão importantes para avaliar o papel do EOAV na população em geral de indivíduos com malformações cardíacas.

  10. Fenomenología de los Recuerdos Autobiográficos en el Espectro Depresivo: Una Revisión

    Directory of Open Access Journals (Sweden)

    María Lolich

    2015-07-01

    Full Text Available La experiencia de rememoración es distintiva de los recuerdos autobiográficos. Si bien memoria y afectividad se encuentran íntimamente relacionadas, son recientes los estudios que buscan indagar en los perfiles fenomenológicos de evocación durante la ocurrencia de alteraciones afectivas. El presente trabajo expone una revisión de las características fenomenológicas de los recuerdos autobiográficos en presencia de alteraciones del espectro depresivo. Se llevo a cabo una revisión bibliográfica en más de 10 bases de datos  (Academic Search Complete, Cambridge Journals Online, Directory of Open Access Journals, PsycArticles, PsycINFO, PUBMED, SCOPUS, SwetsWise, Taylor, Francis Online y Wiley Online Library de aquellos artículos que abordaron la fenomenología de los recuerdos autobiográficos en individuos con alteraciones depresivas publicados durante los años 2000–2014. Fueron incluidos para el análisis un total de 13 publicaciones. Los estudios concluyen que durante la presencia de sintomatología depresiva clínicamente significativa los recuerdos de valencia positiva son evocados desde una perspectiva de tercera persona, con bajos niveles de intensidad emocional y escasa vivacidad. Por otro lado, los recuerdos negativos de tipo intrusivo resultan altamente vívidos y emocionalmente intensos, acompañados por distintos componentes sensoriales. Los resultados preliminares sugieren que los atributos fenomenológicos, tanto de los recuerdos positivos como negativos, se encontrarían relacionados con la aparición y evolución a corto plazo de los cuadros depresivos. Además, una modalidad de evocación de tipo generalizada, en contraposición con una evocación específica, se encontró asociada con la presencia de sintomatología afectiva. Considerando los vínculos entre el sí mismo y la memoria autobiográfica y, dado que los modelos psicoterapéuticos requieren que los individuos exploren su pasado personal, el promover un

  11. Catalogue of neutron spectra

    International Nuclear Information System (INIS)

    Buxerolle, M.; Massoutie, M.; Kurdjian, J.

    1987-09-01

    Neutron dosimetry problems have arisen as a result of developments in the applications of nuclear energy. The largest number of possible irradiation situations has been collected: they are presented in the form of a compilation of 44 neutron spectra. Diagrams show the variations of energy fluence and energy fluence weighted by the dose equivalent/fluence conversion factor, with the logarithm of the corresponding energy. The equivalent dose distributions are presented as percentages for the following energy bins: 0.01 eV/0.5 eV/50 keV/1 MeV/5 MeV/15 MeV. The dose equivalent, the mean energy and the effective energy for the dose equivalent for 1 neutron cm -2 are also given [fr

  12. Design energy spectra for Turkey

    OpenAIRE

    López Almansa, Francisco; Yazgan, Ahmet Utku; Benavent Climent, Amadeo

    2012-01-01

    This work proposes design energy spectra in terms of velocity, derived through linear dynamic analyses on Turkish registers and intended for regions with design peak acceleration 0.3 g or higher. In the long and mid period ranges the analyses are linear, taking profit of the rather insensitivity of the spectra to the structural parameters other than the fundamental period; in the short period range, the spectra are more sensitive to the structural parameters and nonlinear analyses would be re...

  13. Identificación genotípica de β-lactamasas de espectro espectro extendido (BLEE (blaTEM y blaSHV en Escherichia coli uropatógena

    Directory of Open Access Journals (Sweden)

    Yeffersson Grandas Franco

    2016-06-01

    Full Text Available Introducción: Las infecciones de tracto urinario (ITU son consideradas un problema de salud pública a nivel mundial debido a su incidencia y morbilidad. Entre los agentes causales que se aíslan con mayor frecuencia, se encuentra E. coli, con una prevalencia que va desde 40% al 95%. Actualmente, la problemática de las ITU ha venido en aumento, debido a la aparición de resistencia bacteriana a agentes antimicrobianos, influenciado por la presión selectiva, la preexistencia de genes de resistencia y el uso indiscriminado de antibióticos. Objetivo: Identificar molecularmente β-lactamasas de espectro extendido (blaTEM y blaSHV, en E. coli uropatógena, aislada en pacientes ambulatorios que asisten a un laboratorio clínico de tercer nivel de complejidad. Materiales y métodos: Estudio descriptivo de corte transversal. En este trabajo se estudiaron 250 cepas de las cuales 120 eran presuntivas de producir β-lactamasas de acuerdo al método de Kirby-bauer que se realizó años anteriores por el semillero de Inmunidad e Infección. Los genes de interés se amplificaron mediante PCR. Se utilizó Klebsiella pneumoniae ATCC 700603 como control positivo. Una vez amplificado el gen se llevó a cabo el corrido electroforético en gel de agarosa donde el producto amplificado fue de 470 pb en el caso de blaSHV y de 1080 pb para blaTEM. Los fenotipos compatibles con producción de β-lactamasas se analizaron por medio de distribución de frecuencia usando el software WHONET 5,6. La distribución de frecuencia de los genes analizados se calculó usando el software MedCalc versión 15.2.2 (Bélgica – Software BBVA. Resultados: De las cepas analizadas, el 52,8% portadoras del gen blaTEM y el 2,8% del gen blaSHV-2. Se encontró co-existencia de los genes blaSHV-2 y blaTEM en el 1,68% del total de las cepas. De todas las cepas presuntivas de producir BLEE (n=120, 94 fueron productoras de BLEE, lo que nos indicaría que las 21 cepas restantes, implementan

  14. Trastorno del espectro autista

    OpenAIRE

    Mendoza Mendoza, María Yésica

    2012-01-01

    Se explica qué es el autismo, sus causas, tipos, síntomas, tratamiento, detección temprana, técnicas y programas específicos de intervención. A continuación, se analiza el resultado de unos cuestionarios pasados a los padres que tienen hijos con autismo para identificar y conocer el impacto de dicho trastorno en los miembros que conviven con el paciente diagnosticado de autismo y otras comorbilidades asociadas: ansiedad, presión psicológica y trastornos del estado de ánimo

  15. Spectra of chemical trees

    International Nuclear Information System (INIS)

    Balasubramanian, K.

    1982-01-01

    A method is developed for obtaining the spectra of trees of NMR and chemical interests. The characteristic polynomials of branched trees can be obtained in terms of the characteristic polynomials of unbranched trees and branches by pruning the tree at the joints. The unbranched trees can also be broken down further until a tree containing just two vertices is obtained. The effectively reduces the order of the secular determinant of the tree used at the beginning to determinants of orders atmost equal to the number of vertices in the branch containing the largest number of vertices. An illustrative example of a NMR graph is given for which the 22 x 22 secular determinant is reduced to determinants of orders atmost 4 x 4 in just the second step of the algorithm. The tree pruning algorithm can be applied even to trees with no symmetry elements and such a factoring can be achieved. Methods developed here can be elegantly used to find if two trees are cospectral and to construct cospectral trees

  16. Sequencing BPS spectra

    Energy Technology Data Exchange (ETDEWEB)

    Gukov, Sergei [Walter Burke Institute for Theoretical Physics, California Institute of Technology,1200 E California Blvd, Pasadena, CA 91125 (United States); Max-Planck-Institut für Mathematik,Vivatsgasse 7, D-53111 Bonn (Germany); Nawata, Satoshi [Walter Burke Institute for Theoretical Physics, California Institute of Technology,1200 E California Blvd, Pasadena, CA 91125 (United States); Centre for Quantum Geometry of Moduli Spaces, University of Aarhus,Nordre Ringgade 1, DK-8000 (Denmark); Saberi, Ingmar [Walter Burke Institute for Theoretical Physics, California Institute of Technology,1200 E California Blvd, Pasadena, CA 91125 (United States); Stošić, Marko [CAMGSD, Departamento de Matemática, Instituto Superior Técnico,Av. Rovisco Pais, 1049-001 Lisbon (Portugal); Mathematical Institute SANU,Knez Mihajlova 36, 11000 Belgrade (Serbia); Sułkowski, Piotr [Walter Burke Institute for Theoretical Physics, California Institute of Technology,1200 E California Blvd, Pasadena, CA 91125 (United States); Faculty of Physics, University of Warsaw,ul. Pasteura 5, 02-093 Warsaw (Poland)

    2016-03-02

    This paper provides both a detailed study of color-dependence of link homologies, as realized in physics as certain spaces of BPS states, and a broad study of the behavior of BPS states in general. We consider how the spectrum of BPS states varies as continuous parameters of a theory are perturbed. This question can be posed in a wide variety of physical contexts, and we answer it by proposing that the relationship between unperturbed and perturbed BPS spectra is described by a spectral sequence. These general considerations unify previous applications of spectral sequence techniques to physics, and explain from a physical standpoint the appearance of many spectral sequences relating various link homology theories to one another. We also study structural properties of colored HOMFLY homology for links and evaluate Poincaré polynomials in numerous examples. Among these structural properties is a novel “sliding” property, which can be explained by using (refined) modular S-matrix. This leads to the identification of modular transformations in Chern-Simons theory and 3d N=2 theory via the 3d/3d correspondence. Lastly, we introduce the notion of associated varieties as classical limits of recursion relations of colored superpolynomials of links, and study their properties.

  17. Sequencing BPS spectra

    International Nuclear Information System (INIS)

    Gukov, Sergei; Nawata, Satoshi; Saberi, Ingmar; Stošić, Marko; Sułkowski, Piotr

    2016-01-01

    This paper provides both a detailed study of color-dependence of link homologies, as realized in physics as certain spaces of BPS states, and a broad study of the behavior of BPS states in general. We consider how the spectrum of BPS states varies as continuous parameters of a theory are perturbed. This question can be posed in a wide variety of physical contexts, and we answer it by proposing that the relationship between unperturbed and perturbed BPS spectra is described by a spectral sequence. These general considerations unify previous applications of spectral sequence techniques to physics, and explain from a physical standpoint the appearance of many spectral sequences relating various link homology theories to one another. We also study structural properties of colored HOMFLY homology for links and evaluate Poincaré polynomials in numerous examples. Among these structural properties is a novel “sliding” property, which can be explained by using (refined) modular S-matrix. This leads to the identification of modular transformations in Chern-Simons theory and 3d N=2 theory via the 3d/3d correspondence. Lastly, we introduce the notion of associated varieties as classical limits of recursion relations of colored superpolynomials of links, and study their properties.

  18. Distribución de genes codificadores de β-lactamasas de espectro extendido en aislamientos de Klebsiella pneumoniae de hospitales de Bogotá, D.C., Colombia

    Directory of Open Access Journals (Sweden)

    Ingrid Yamile Pulido

    2011-04-01

    Conclusión. Se identificaron once genes bla, de los cuales, ocho eran codificadores de beta-lactamasas de espectro extendido. La diversidad encontrada de los genes bla sugiere la continua exposición de K. pneumoniae a fuertes presiones antibióticas, como las observadas en nuestros hospitales.

  19. Transtornos do espectro do autismo e educação inclusiva: análise de atitudes sociais de professores e alunos frente à inclusão

    Directory of Open Access Journals (Sweden)

    Maria Cláudia Brito

    2017-11-01

    Full Text Available O objetivo deste estudo foi descrever as atitudes sociais de professores e alunos que compõem o ambiente escolar de crianças com transtornos do espectro do autismo, acerca da inclusão. Participaram 73 educadores e 116 alunos, de quatro escolas públicas, sendo duas escolas sem experiência de educação inclusiva e duas escolas com crianças com transtornos do espectro do autismo, de 5º. ano, gênero masculino, 10 anos de idade. Foram utilizadas com as duas crianças com transtornos do espectro do autismo provas de avaliação de linguagem e de comportamentos. Para verificar as atitudes sociais dos professores, empregou-se a Escala Likert de Atitudes Sociais em relação à Inclusão e dos alunos a Escala Infantil de Atitudes Sociais. Os resultados mostraram que não houve diferenças nas atitudes sociais dos professores, e que as atitudes sociais expressas pelos colegas da criança com transtornos do espectro do autismo de quadro clínico menos severo foram mais positivas do que as dos outros três grupos.

  20. Terapia de linguagem no espectro autístico: a interferência do ambiente terapêutico Language therapy and autism spectrum: the therapeutic environment interference

    Directory of Open Access Journals (Sweden)

    Andréa Regina Nunes Misquiatti

    2011-06-01

    Full Text Available OBJETIVO: Analisar o perfil funcional da comunicação de crianças e adolescentes com distúrbios do espectro autístico em dois ambientes de terapia de linguagem, que se diferenciam quanto ao aspecto físico. MÉTODOS: Participaram dez sujeitos com distúrbios do espectro autístico, seis do gênero masculino e quatro do gênero feminino, com idades entre 4 e 13 anos. Na coleta de dados, foram realizadas filmagens de oito sessões de terapia de linguagem individual com duração de 30 minutos, sendo quatro sessões em uma sala comum e quatro em uma sala com ambientação específica (sala NIC, intercaladamente, durante um mês. Para a análise dos dados foi empregado o Protocolo de Pragmática, e os resultados receberam tratamento estatístico. RESULTADOS: Verificou-se que não houve diferença significativa entre o perfil pragmático apresentado pelos dez sujeitos na sala comum e na sala NIC. CONCLUSÃO: O contexto físico aqui estudado não influenciou significativamente no perfil funcional da comunicação de indivíduos do espectro autístico, ainda que se tenha verificado tendências individuais apresentando melhor desempenho em uma sala ou em outra.PURPOSE: To analyze the functional communicative profile of children and adolescents with autistic spectrum disorders in two different language therapy environments which differ from each other on the physical environment. METHODS: Participants were ten subjects with autistic spectrum disorders, six male and four female, with ages varying from 4 to 13 years. For data gathering, eight 30-minute individual language therapy sessions were videotaped: four sessions in regular therapy settings (common room interspersed with four sessions in a specific environment setting (NIC room, for one month. Results were registered on the Pragmatic Protocol, and statistical analysis was carried out. RESULTS: No significant differences were found between the pragmatic profile presented by the subjects in the

  1. Relações familiares e habilidades sociais de irmãos de indivíduos com transtorno do espectro autístico: estudo comparativo

    OpenAIRE

    Feltrin, Aline Beatriz Silva [UNESP

    2007-01-01

    Por meio do convívio diário, os irmãos podem adquirir habilidades sociais e cognitivas fundamentais para o desenvolvimento social saudável. As contingências que configuram estas relações podem ser diferentes daquelas a que estão submetidos irmãos de crianças com desenvolvimento normal ou irmãos de indivíduos com outros tipos de deficiência, o que justifica estudos envolvendo interações entre irmãos de crianças com Transtorno do Espectro Autístico (TEA). O acervo de investigações desenvolvidas...

  2. Espectro polínico y análisis fisicoquímico de mieles de la Región del Biobío, Chile

    OpenAIRE

    Navarrete, Carolina; Muñoz-Olivera, Gladys; Wells, Guillermo; Becerra, Julio; Alarcón, Julio; Finot, Víctor L.

    2016-01-01

    RESUMEN Se analizó el espectro polínico y las características fisicoquímicas de 13 muestras de mieles producidas por Apis mellifera en dos áreas con diferente grado de intervención antrópica en la Región del Biobío, Provincia de Ñuble, Chile: a) Depresión Intermedia y b) zonas precordilleranas de la Cordillera de los Andes. Los datos polínicos y físicoquímicos se sometieron a análisis de componentes principales y la diversidad polínica se calculó con el índice de diversidad de Shannon-Weaver ...

  3. Os efeitos da música em biomarcadores de estresse, imunológicos e comportamentais em portadores do espectro autista

    OpenAIRE

    Juliane Neves Fiorezi; Silvia Isabel Rech Franke; Daniel Prá; Edna Linhares Garcia; Jane Dagmar Pollo Renner

    2018-01-01

    Resumo: A utilização da Musicoterapia em portadores do Transtorno do Espectro Autista (TEA) teve início na década de 60 e mostrou promover benefícios, tais como: diminuição de crises comportamentais, diminuição de resistência ao tratamento, melhora nos relacionamentos interpessoais, aquisição de liberdade expressiva, aquisição da melhora vocal, melhora na comunicação, aquisição de confiança verbal e vocal, aquisição de ordem rítmica e melhora na produção da fala e mutualidade (BRANDALISE, 201...

  4. EL AJUSTE CONDUCTUAL, EMOCIONAL Y SOCIAL EN HERMANOS DE NIÑOS CON UN TRASTORNO DEL ESPECTRO AUTISTA. UNA REVISIÓN TEÓRICA

    Directory of Open Access Journals (Sweden)

    Raquel Ruiz Aparicio

    2015-09-01

    Full Text Available Las personas con Trastorno del Espectro Autista (TEA tienen características únicas y hay una falta de conocimiento sobre cómo estas características podrían influir en sus familias y en el ajuste conductual, emocional y social de sus hermanos. El presente estudio tiene el objetivo de centrarse en los hermanos de estas personas con TEA y realizar una revisión teórica relacionada con el ajuste conductual, emocional y social de hermanos de niños con TEA. Un total de 24 artículos han sido incluidos y analizados con el fin de encontrar resultados relevantes que puedan ayudar a entender las necesidades de estos hermanos. El estudio sugiere, en ocasiones, resultados diferentes pero identifica aquellos factores de riesgo que podrían impactar en el núcleo familiar y, principalmente, en los hermanos de niños con TEA.

  5. Rejeição e vitimização por pares em crianças com deficiência intelectual e transtorno do espectro autista

    Directory of Open Access Journals (Sweden)

    Deisy Ribas Emerich

    2017-08-01

    Full Text Available Crianças com necessidades educacionais especiais, como Deficiência Intelectual (DI e Transtornos do Espectro Autista (TEA, participam cada vez mais de classes regulares. Apesar da relevância desta inclusão, tais crianças podem enfrentar dificuldades como rejeição e vitimização pelos pares. Por meio de uma revisão da literatura, o presente trabalho teve como objetivo identificar a prevalência, o impacto e os fatores associados à rejeição e vitimização em crianças com DI e TEA. A busca foi realizada nas bases de dados Web of Science, Pubmed, Medline, Lilacs e Scielo, com os descritores: rejeição por pares, vitimização por pares, deficiência intelectual, criança com deficiência e necessidades especiais, Transtorno do Espectro do Autismo e seus correlatos em inglês nas bases internacionais. Foram identificados 196 artigos, dos quais 32 preencheram os critérios de inclusão. Verificou-se elevada prevalência de vitimização e alta taxa de rejeição em relação a crianças com necessidades educacionais especiais, independentemente da idade. Déficits nas habilidades sociais e nas funções executivas, comportamento desatento e hiperativo e queixas internalizantes mostraram-se associados às dificuldades no relacionamento com os pares nessa população. Estes indicadores devem ser incluídos em programas de prevenção e/ou tratamento para viabilizar a adequada inclusão de crianças com necessidades educacionais especiais em salas de aula regulares.

  6. Avaliação audiológica comportamental e eletrofisiológica no transtorno do espectro do autismo

    Directory of Open Access Journals (Sweden)

    Ana Carla Leite Romero

    2014-06-01

    Full Text Available Objetivo descrever os achados das avaliações audiológicas comportamentais e eletrofisiológicas de pacientes com diagnóstico de transtorno do espectro do autismo. Métodos estudo descritivo, de coorte contemporânea com corte transversal, composto por nove pacientes com diagnóstico de transtorno do espectro do autismo, submetidos a avaliação comportamental e eletrofisiológica da audição. Os resultados foram analisados por meio de estatística descritiva. Resultados todos os pacientes avaliados apresentaram limiares audiométricos dentro dos padrões de normalidade. Oito pacientes apresentaram curva timpanométrica do tipo A, e um do tipo C. Observou-se emissões otoacústicas por produto de distorção presentes em todos os pacientes avaliados. Os resultados do potencial evocado auditivo de tronco encefálico demonstraram integridade das vias auditiva. Conclusão a população estudada apresentou resultados compatíveis com a normalidade tanto na avaliação comportamental como na avaliação eletrofisiológica da audição. Pelo fato de não haver consenso, na literatura especializada, quanto aos achados audiológicos nesta população, principalmente no que se refere à avaliação eletrofisiológica do processamento auditivo, sugere-se a realização de novos estudos.

  7. El uso de la musicoterapia para la mejora de la comunicación de niños con Trastorno del Espectro Autista en Aulas Abiertas Especializadas

    Directory of Open Access Journals (Sweden)

    Paloma del Rocío TALAVERA JARA

    2016-01-01

    Full Text Available Los beneficios que aporta la musicoterapia en alumnos con Trastorno del Espectro Autista, han sido demostrados profusamente por los distintos autores, si bien carecemos de literatura suficiente sobre su utilización en las Aulas Abiertas Especializadas en colegios ordinarios (Aulas TEA. En este sentido, el objetivo del trabajo, ha consistido en analizar qué mejoras aporta la musicoterapia al desarrollo de la comunicación en los alumnos con Trastorno del Espectro Autista dentro de las Aulas Abiertas de los CEIPs de Castilla-La Mancha y la Comunidad Autónoma de Madrid. Para ello, se ha realizado una amplia revisión documental de fuentes de referencia y se ha entrevistado a los docentes responsables de las Aulas Abiertas Especializadas que utilizan actividades de musicoterapia como recurso en el aula. Se concluye el artículo manifestando, en primer lugar, la escasa integración de la musicoterapia en las aulas TEA (menos del 20% de los centros. En aquellas aulas que sí se programa con actividades de musicoterapia, los beneficios que ésta aporta se ven reflejados en un incremento claro de la intención comunicativa en los alumnos. Además, a la hora de planificar las actividades se tiene muy en cuenta conocer las preferencias y la historia musical del niño. No obstante, existen factores que impiden el aprovechamiento total de las posibilidades terapéuticas de la musicoterapia debido, especialmente a: a una escasa formación del profesorado y b un espacio inadecuado para poner en práctica una sesión de musicoterapia.

  8. Interpretation of recent positron-electron measurements between 20 and 800 MeV

    International Nuclear Information System (INIS)

    Pellerin, C.J.; Hartman, R.C.

    1975-01-01

    The recent positron and negatron spectra measured by Hartman and Pellerin (see pages 402-407) are discussed with regard to the problem of solar modulation. At energies above 180 MeV, the spherically symmetric Fokker-Planck equation with a diffusion coefficient proportional to particle rigidity provides reasonable fits to both the positron and total electron data. At energies below 180 MeV the data are consistent with a continuation of the same diffusion coefficient and local source of negatrons, or a change in the diffusion coefficient to a constant value. (orig.) [de

  9. Raman spectra of lithium compounds

    Science.gov (United States)

    Gorelik, V. S.; Bi, Dongxue; Voinov, Y. P.; Vodchits, A. I.; Gorshunov, B. P.; Yurasov, N. I.; Yurasova, I. I.

    2017-11-01

    The paper is devoted to the results of investigating the spontaneous Raman scattering spectra in the lithium compounds crystals in a wide spectral range by the fibre-optic spectroscopy method. We also present the stimulated Raman scattering spectra in the lithium hydroxide and lithium deuteride crystals obtained with the use of powerful laser source. The symmetry properties of the lithium hydroxide, lithium hydroxide monohydrate and lithium deuteride crystals optical modes were analyzed by means of the irreducible representations of the point symmetry groups. We have established the selection rules in the Raman and infrared absorption spectra of LiOH, LiOH·H2O and LiD crystals.

  10. FSFE: Fake Spectra Flux Extractor

    Science.gov (United States)

    Bird, Simeon

    2017-10-01

    The fake spectra flux extractor generates simulated quasar absorption spectra from a particle or adaptive mesh-based hydrodynamic simulation. It is implemented as a python module. It can produce both hydrogen and metal line spectra, if the simulation includes metals. The cloudy table for metal ionization fractions is included. Unlike earlier spectral generation codes, it produces absorption from each particle close to the sight-line individually, rather than first producing an average density in each spectral pixel, thus substantially preserving more of the small-scale velocity structure of the gas. The code supports both Gadget (ascl:0003.001) and AREPO.

  11. Infrared spectra of mineral species

    CERN Document Server

    Chukanov, Nikita V

    2014-01-01

    This book details more than 3,000 IR spectra of more than 2,000 mineral species collected during last 30 years. It features full descriptions and analytical data of each sample for which IR spectrum was obtained.

  12. Correlation Functions and Power Spectra

    DEFF Research Database (Denmark)

    Larsen, Jan

    2006-01-01

    The present lecture note is a supplement to the textbook Digital Signal Processing by J. Proakis and D.G. Manolakis used in the IMM/DTU course 02451 Digital Signal Processing and provides an extended discussion of correlation functions and power spectra. The definitions of correlation functions...... and spectra for discrete-time and continuous-time (analog) signals are pretty similar. Consequently, we confine the discussion mainly to real discrete-time signals. The Appendix contains detailed definitions and properties of correlation functions and spectra for analog as well as discrete-time signals....... It is possible to define correlation functions and associated spectra for aperiodic, periodic and random signals although the interpretation is different. Moreover, we will discuss correlation functions when mixing these basic signal types. In addition, the note include several examples for the purpose...

  13. Comunicação e transtornos do espectro do autismo: análise do conhecimento de professores em fases pré e pós-intervenção

    Directory of Open Access Journals (Sweden)

    Andréa Regina Nunes Misquiatti

    2014-04-01

    Full Text Available Objetivo analisar o conhecimento de professores de ensino fundamental sobre a comunicação de pessoas com transtornos do espectro do autismo, em dois momentos distintos, pré e pós-intervenção. Métodos trata-se de um estudo descritivo comparativo, em que participaram 160 professores de escolas municipais de ensino fundamental, de ambos os gêneros, com idades entre 23 e 65 anos. Para verificar o conhecimento dos professores sobre a comunicação nos transtornos do espectro do autismo, foi elaborado e aplicado um questionário especificamente para este estudo. O instrumento, oferecido aos professores, foi aplicado em dois momentos distintos, pré e pós-intervenção. O procedimento de intervenção constou de dois encontros, de quatro horas cada, conduzidos por fonoaudiólogos e entrega de manual de orientação sobre os transtornos do espectro do autismo, com ênfase em aspectos da comunicação e linguagem. Foram analisadas e comparadas as respostas pré e pós-intervenção. Os resultados foram tratados estatisticamente (p<0,05 e em alguns casos p<0,01; foi utilizado o teste de Qui-quadrado para Proporções. Resultados foi possível observar que os professores apresentavam conhecimento restrito sobre a comunicação nos transtornos do espectro do autismo e sobre esses quadros clínicos de modo geral. Além disso, verificou-se aumento significante de respostas corretas por parte dos professores após a intervenção. Conclusão constatou-se um restrito conhecimento dos professores sobre a comunicação nos transtornos do espectro do autismo e efeitos positivos do procedimento de intervenção, por meio da análise comparativa entre as fases pré e pós-intervenção, que evidenciou aumento significante de respostas adequadas sobre os transtornos do espectro do autismo.

  14. Influence of blue light spectrum filter on short-wavelength and standard automated perimetries Influência de filtro para o espectro azul da luz na perimetria computadorizada branco-branco e azul-amarelo

    Directory of Open Access Journals (Sweden)

    Leonardo Cunha Castro

    2006-10-01

    Full Text Available PURPOSE: To evaluate the influence of a blue light spectrum filter (BLSF, similar in light spectrum transmittance to the intraocular lens Acrysof NaturalTM, on standard automated perimetry (SAP and short-wavelength automated perimetry (SWAP. METHODS: Twenty young individuals (OBJETIVO: Avaliar a influência de um filtro para o espectro azul da luz, semelhante à lente intra-ocular Acrysof Natural®, nos exames de perimetria automatizada padrão (branco-no-branco e de comprimento de onda curto (azul-no-amarelo. MÉTODOS: Vinte pacientes jovens sem alterações oculares (20 olhos realizaram seqüência de 4 exames de campo visual: perimetria automatizada padrão e azul-no-amarelo com e sem o filtro para o espectro azul da luz. Os índices de limiar foveal (FT, desvio médio (MD e desvio-padrão (PSD obtidos em todos os exames e a diferença causada pela excentricidade nos exames de perimetria automatizada azul-no-amarelo foram analisados. Variabilidade interindivíduos (desvio-padrão dos pontos testados foi calculada. RESULTADOS: Observou-se redução estatisticamente significante no desvio médio (p<0.001 e no limiar foveal (p<0.001 medidos pela perimetria automatizada azul-no-amarelo com o uso do filtro para o espectro azul da luz comparado quando realizado sem o filtro. Nenhum outro índice avaliado apresentou diferença estatisticamente significante nos exames de perimetria automatizada padrão ou azul-no-amarelo. Foi notado aumento da variabilidade interindivíduos com a excentricidade nos exames de perimetria automatizada azul-no-amarelo com e sem o uso do filtro para o espectro azul da luz, assim como a diferença de sensibilidade entre os hemisférios inferior e superior (hemisfério inferior menos superior, mas não houve diferença estatisticamente significante quando comparados os exames com e sem o uso do filtro. Quando foram comparados os 4 pontos mais inferiores e os 4 pontos mais superiores, a diferença inferior-superior aumentou

  15. Multifractal spectra in shear flows

    Science.gov (United States)

    Keefe, L. R.; Deane, Anil E.

    1989-01-01

    Numerical simulations of three-dimensional homogeneous shear flow and fully developed channel flow, are used to calculate the associated multifractal spectra of the energy dissipation field. Only weak parameterization of the results with the nondimensional shear is found, and this only if the flow has reached its asymptotic development state. Multifractal spectra of these flows coincide with those from experiments only at the range alpha less than 1.

  16. Sequential Analysis of Gamma Spectra

    International Nuclear Information System (INIS)

    Fayez-Hassan, M.; Hella, Kh.M.

    2009-01-01

    This work shows how easy one can deal with a huge number of gamma spectra. The method can be used for radiation monitoring. It is based on the macro feature of the windows XP connected to QBASIC software. The routine was used usefully in generating accurate results free from human errors. One hundred measured gamma spectra were fully analyzed in 10 minutes using our fast and automated method controlling the Genie 2000 gamma acquisition analysis software.

  17. Response spectra in alluvial soils

    International Nuclear Information System (INIS)

    Chandrasekharan, A.R.; Paul, D.K.

    1975-01-01

    For aseismic design of structures, the ground motion data is assumed either in the form of ground acceleration as a function of time or indirectly in the form of response spectra. Though the response spectra approach has limitations like not being applicable for nonlinear problems, it is usually used for structures like nuclear power plants. Fifty accelerograms recorded at alluvial sites have been processed. Since different empirical formulas relating acceleration with magnitude and distance give a wide scatter of values, peak ground acceleration alone cannot be the parameter as is assumed by a number of authors. The spectra corresponding to 5% damping have been normalised with respect to three parameters, namely, peak ground acceleration, peak ground velocity and a nondimensional quantity ad/v 2 . Envelopee of maxima and minima as well as average response spectra has been obtained. A comparison with the USAEC spectra has been made. A relation between ground acceleration, ground velocity and ad/v 2 has been obtained which would nearly give the same magnification of the response. A design response spectra for alluvial soils has been recommended. (author)

  18. Biological Action Spectra (invited paper)

    International Nuclear Information System (INIS)

    Gruijl, F.R. de

    2000-01-01

    Ultraviolet (UV) radiation induces a wide variety of biological responses: ranging in humans from well-known short-term effects like sunburn to long-term effects like skin cancer. The wavelength dependencies ('action spectra') of the responses can differ significantly, depending on the UV-targeted molecules (their absorption spectra), their localisation (transmission to the target depth) and the photochemical reactions involved (e.g. quantum yields, competing reaction). An action spectrum (e.g. of sunburn) is usually determined in a wavelength by wavelength analysis of the response. This is not always possible (e.g. in case of skin cancer), and an action spectrum may then be extracted mathematically from differences in responses to broadband UV sources of various spectral compositions (yielding 'biological spectral weights'). However, relative spectral weights may shift with exposure levels and contributions from different wavelengths may not always add up. Under these circumstances conventional analyses will yield different action spectra for different experimental conditions. (author)

  19. Double photoionisation spectra of molecules

    CERN Document Server

    Eland, John

    2017-01-01

    This book contains spectra of the doubly charged positive ions (dications) of some 75 molecules, including the major constituents of terrestrial and planetary atmospheres and prototypes of major chemical groups. It is intended to be a new resource for research in all areas of molecular spectroscopy involving high energy environments, both terrestrial and extra-terrestrial. All the spectra have been produced by photoionisation using laboratory lamps or synchrotron radiation and have been measured using the magnetic bottle time-of-flight technique by coincidence detection of correlated electron pairs. Full references to published work on the same species are given, though for several molecules these are the first published spectra. Double ionisation energies are listed and discussed in relation to the molecular electronic structure of the molecules. A full introduction to the field of molecular double ionisation is included and the mechanisms by which double photoionisation can occur are examined in detail. A p...

  20. QUALITATIVE INTERPRETATION OF GALAXY SPECTRA

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez Almeida, J.; Morales-Luis, A. B. [Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife (Spain); Terlevich, R.; Terlevich, E. [Instituto Nacional de Astrofisica, Optica y Electronica, Tonantzintla, Puebla (Mexico); Cid Fernandes, R., E-mail: jos@iac.es, E-mail: abml@iac.es, E-mail: rjt@ast.cam.ac.uk, E-mail: eterlevi@inaoep.mx, E-mail: cid@astro.ufsc.br [Departamento de Fisica-CFM, Universidade Federal de Santa Catarina, P.O. Box 476, 88040-900 Florianopolis, SC (Brazil)

    2012-09-10

    We describe a simple step-by-step guide to qualitative interpretation of galaxy spectra. Rather than an alternative to existing automated tools, it is put forward as an instrument for quick-look analysis and for gaining physical insight when interpreting the outputs provided by automated tools. Though the recipe is for general application, it was developed for understanding the nature of the Automatic Spectroscopic K-means-based (ASK) template spectra. They resulted from the classification of all the galaxy spectra in the Sloan Digital Sky Survey data release 7, thus being a comprehensive representation of the galaxy spectra in the local universe. Using the recipe, we give a description of the properties of the gas and the stars that characterize the ASK classes, from those corresponding to passively evolving galaxies, to H II galaxies undergoing a galaxy-wide starburst. The qualitative analysis is found to be in excellent agreement with quantitative analyses of the same spectra. We compare the mean ages of the stellar populations with those inferred using the code STARLIGHT. We also examine the estimated gas-phase metallicity with the metallicities obtained using electron-temperature-based methods. A number of byproducts follow from the analysis. There is a tight correlation between the age of the stellar population and the metallicity of the gas, which is stronger than the correlations between galaxy mass and stellar age, and galaxy mass and gas metallicity. The galaxy spectra are known to follow a one-dimensional sequence, and we identify the luminosity-weighted mean stellar age as the affine parameter that describes the sequence. All ASK classes happen to have a significant fraction of old stars, although spectrum-wise they are outshined by the youngest populations. Old stars are metal-rich or metal-poor depending on whether they reside in passive galaxies or in star-forming galaxies.

  1. Os efeitos da música em biomarcadores de estresse, imunológicos e comportamentais em portadores do espectro autista

    Directory of Open Access Journals (Sweden)

    Juliane Neves Fiorezi

    2018-02-01

    Full Text Available Resumo: A utilização da Musicoterapia em portadores do Transtorno do Espectro Autista (TEA teve início na década de 60 e mostrou promover benefícios, tais como: diminuição de crises comportamentais, diminuição de resistência ao tratamento, melhora nos relacionamentos interpessoais, aquisição de liberdade expressiva, aquisição da melhora vocal, melhora na comunicação, aquisição de confiança verbal e vocal, aquisição de ordem rítmica e melhora na produção da fala e mutualidade (BRANDALISE, 2013. Objetivo: embora os resultados em nível comunicacional sejam de amplo conhecimento e na busca por compreender o impacto da música nos biomarcadores imunológicos e de estresse nesses indivíduos, o presente artigo tem por objetivo apresentar uma breve revisão dos estudos recentes acerca dessa temática. Método: Foram utilizadas ferramentas de busca nas bases de dados PubMed, Lilacs, Cochrane e Scielo. A busca foi realizada em artigos publicados em português e inglês, por meio dos descritores “imunoglobulina”, “cortisol salivar”, “dano celular” e “autismo”. Resultado: por meio da pesquisa foi possível constatar a influência da música como um meio complementar no cuidado de portadores do TEA, enquanto instrumento de promoção da saúde e melhoria de qualidade de vida desses indivíduos. Considerações finais: Embora os estudos apontem os benefícios da música em portadores do TEA, sugere-se que sejam realizadas mais pesquisas nesse campo, sobretudo no Brasil. Portanto, o presente artigo se propõe como base teórica para uma posterior pesquisa-intervenção a fim de verificar os possíveis efeitos provocados por diferentes tipos de escuta musical sobre os indicadores de cortisol salivar, imunoglobulina A e dano celular de células epiteliais, bem como nos aspectos comportamentais, em crianças portadoras do Transtorno do Espectro Autista. A segunda fase da pesquisa já está em desenvolvimento, por meio do

  2. Estudio sísmico de los edificios agregados de obra de fábrica utilizando el método del espectro de capacidad

    Directory of Open Access Journals (Sweden)

    Moreno-González, R.

    2014-03-01

    Full Text Available In this work a study about the seismic behaviour of a set of masonry aggregates buildings located in the city of Barcelona, Spain, is presented. Considering the age of these buildings (more than 70 years two mechanical properties for the masonry were defined. The seismic action considered is defined by elastic response spectrum defined by Eurocode 8 for the seismic acceleration of Barcelona. To analyze these buildings the capacity spectrum method was used, from which the capacity curve and the fragility curves are obtained for evaluating the seismic expected damage. Damage probability matrices quantified the seismic damage and they are obtained from the fragility curves and the performance point. Considering that the city of Barcelona is located in an area of low seismicity, the results show an important seismic damage.Se presenta un estudio sobre el comportamiento sísmico de un conjunto de edificios agregados de obra de fábrica situados en la ciudad de Barcelona, España. Considerando la edad que tienen estos edificios (más de 70 años se definen dos propiedades mecánicas para la mampostería. La acción sísmica considerada se define a partir del espectro elástico de respuesta definido en el Eurocódigo 8 para la aceleración sísmica de Barcelona. Para analizar los edificios se utiliza el método del espectro de capacidad, a partir del cual se obtienen la curva de capacidad y las curvas de fragilidad para evaluar el daño sísmico esperado. Las matrices de probabilidad de daño cuantifican el daño sísmico y se obtienen a partir de las curvas de fragilidad y el punto de capacidad por demanda. Teniendo en cuenta que Barcelona se encuentra en una zona de baja sismicidad, los resultados obtenidos muestran un daño sísmico importante.

  3. Comorbilidades psiquiátricas en los trastornos del espectro autista: estudio comparativo entre los criterios DSM-IV-TR y DSM-5

    Directory of Open Access Journals (Sweden)

    Marina Romero

    2016-01-01

    Full Text Available Antecedentes/Objetivo: Los Trastornos del Espectro Autista (TEA incluyen un grupo heterogéneo en cuanto a su presentación clínica, lo que supone un desafío a nivel de caracterización diagnóstica. Por consiguiente, el objetivo principal de la clasificación DSM-5 debería de ser identificar subgrupos de ASD que incluyan severidad y comorbilidades psiquiátricas. El objetivo principal de este estudio es explorar las comorbilidades diagnósticas que pueden ser relevantes como descriptores de fenotipos autistas así como la severidad de los síntomas de autismo y comparar los resultados de las diferentes criterios de clasificación entre el DSM-IV-TR y el DSM-5. Método: Se realiza un estudio comparati - vo de severidad y comorbilidades psiquiátricas entre una muestra con diagnóstico de Trastorno Generalizado del Desarrollo, según criterios DSM-IV-TR, y una muestra que cumplía también criterios para TEA según la clasificación DSM-5. La muestra fue obtenida en centros educativos ( n =123. Las comorbilidades psiquiátricas y la severidad de los síntomas se evaluaron a través del The Nisonger Child Behavior Rating Form , entrevista clínica y el Inventario de Trastorno del Espectro Autista, respectivamente. Las comorbi - lidades estudiadas fueron ansiedad, alteraciones de la conducta alimentaria, auto-agre - sividad, hetero-agresividad, autolesiones, trastorno obsesivo-compulsivo y déficit de atención e hiperactividad. Resultados: Se encontraron diferencias estadísticamente sig - nificativas entre ambos grupos para trastorno obsesivo-compulsivo , alteraciones de la conducta alimentaria y severidad . Conclusiones: Se apoya la hipótesis de que los indivi - duos que cumplen criterios diagnósticos según DSM-5 tienen mayor severidad sintomáti - ca, no sólo con respecto a los síntomas autistas centrales, sino también en relación con comorbilidades psiquiátricas.

  4. ESPECTROS DE CARGA DE CAMIONES PARA EL ANALISIS Y DISEÑO DE PAVIMENTOS EN LA REGIÓN ANDINA COLOMBIANA

    Directory of Open Access Journals (Sweden)

    Luis Macea

    2015-01-01

    Full Text Available Para el adecuado dimensionamiento de las estructuras de pavimento, se requiere la estimación de los efectos agrupados de las cargas del tránsito, por lo cual se debe conocer el número y tipo de vehículos que circularán por la vía, así como la intensidad del peso y la configuración del eje que la aplica, aspecto que es abordado cuando se hace la caracterización del tránsito a través de espectros de carga. En razón de esto en el presente artículo se construyen espectros de la capacidad por tipo de eje de camiones para diferentes rutas y departamentos de la región andina colombiana, de igual forma se Identifican los porcentajes de sobrecarga y las zonas donde se sobrepasa el límite máximo de peso permitido, así como los tipos de productos transportados en condiciones de exceso de peso. Para esto, se realizaron veintiséis (26 operativos de pesaje móvil de camiones en distintos corredores de carga de la región andina en el año 2013, con lo cual se obtuvo una muestra de 94.132 ejes pesados, a partir de los cuales se agruparon las capacidades por cada tipo de eje y se determinaron sus respectivas frecuencias de arrumaje. Los resultados encontrados indicaron que el eje sencillo direccional de llanta sencilla presenta un solo pico máximo con cierto grado de asimetría, el cual se encuentra regularmente por debajo de la carga máxima legal establecida para este tipo de eje, Por otro lado, los ejes sencillo de llanta doble presentan una bimodalidad con dos picos máximos muy parejos, uno en el sentido de las cargas bajas y el otro en el sentido de las cargas altas, mientras que los ejes tándem y tridem de llanta doble presentan una bimodalidad caracterizada por el predominio de un pico máximo absoluto del lado de las cargas altas lo que indica que los camiones están circulando con carga al límite permitido.

  5. The structure of BPS spectra

    Science.gov (United States)

    Longhi, Pietro

    In this thesis we develop and apply novel techniques for analyzing BPS spectra of supersymmetric quantum field theories of class S. By a combination of wall-crossing, spectral networks and quiver methods we explore the BPS spectra of higher rank four-dimensional N = 2 super Yang-Mills, uncovering surprising new phenomena. Focusing on the SU(3) case, we prove the existence of wild BPS spectra in field theory, featuring BPS states of higher spin whose degeneracies grow exponentially with the energy. The occurrence of wild BPS states is surprising because it appears to be in tension with physical expectations on the behavior of the entropy as a function of the energy scale. The solution to this puzzle comes from realizing that the size of wild BPS states grows rapidly with their mass, and carefully analyzing the volume-dependence of the entropy of BPS states. We also find some interesting structures underlying wild BPS spectra, such as a Regge-like relation between the maximal spin of a BPS multiplet and the square of its mass, and the existence of a universal asymptotic distribution of spin-j irreps within a multiplet of given charge. We also extend the spectral networks construction by introducing a refinement in the topological classification of 2d-4d BPS states, and identifying their spin with a topological invariant known as the "writhe of soliton paths". A careful analysis of the 2d-4d wall-crossing behavior of this refined data reveals that it is described by motivic Kontsevich-Soibelman transformations, controlled by the Protected Spin Character, a protected deformation of the BPS index encoding the spin of BPS states. Our construction opens the way for the systematic study of refined BPS spectra in class S theories. We apply it to several examples, including ones featuring wild BPS spectra, where we find an interesting relation between spectral networks and certain functional equations. For class S theories of A 1 type, we derive an alternative technique for

  6. Automatic identification of mass spectra

    International Nuclear Information System (INIS)

    Drabloes, F.

    1992-01-01

    Several approaches to preprocessing and comparison of low resolution mass spectra have been evaluated by various test methods related to library search. It is shown that there is a clear correlation between the nature of any contamination of a spectrum, the basic principle of the transformation or distance measure, and the performance of the identification system. The identification of functionality from low resolution spectra has also been evaluated using several classification methods. It is shown that there is an upper limit to the success of this approach, but also that this can be improved significantly by using a very limited amount of additional information. 10 refs

  7. Investigation of gamma spectra analysis

    International Nuclear Information System (INIS)

    Wu Huailong; Liu Suping; Hao Fanhua; Gong Jian; Liu Xiaoya

    2006-01-01

    In the investigation of radiation fingerprint comparison, it is found out that some of the popular gamma spectra analysis software have shortcomings, which decrease the radiation fingerprint comparison precision. So a new analysis software is developed for solving the problems. In order to display the advantage of developed program, some typical simulative warhead gamma spectra are analyzed respectively by present software and GAMMAVISION and GENNIE2000. Present software can be applied not only in nuclear warheads deep-cuts verification, but also in any radiation measurement field. (authors)

  8. Ultraviolet spectra of planetary nebulae

    International Nuclear Information System (INIS)

    Adams, S.; Seaton, M.J.

    1982-01-01

    Features observed in infrared spectra suggest that certain very low excitation (VLE) nebulae have low C/O abundance ratios (Cohen and Barlow 1980; Aitken and Roche 1982). Fluxes in the multiplets [O II] lambda 2470 and C II] lambda 2326 have been measured for the VLE nebula He He 2-131 = HD 138403 using IUE high-dispersion spectra. An analysis similar to that of Harrington et al. (1980) for IC 418 gives C/O = 0.3 for He 2-131, compared with C/O = 1.3 for IC 418 and 0.6 for the Sun. (author)

  9. Investigation of gamma spectra analysis

    International Nuclear Information System (INIS)

    Wu Huailong; Liu Suping; Hao Fanhua

    2006-12-01

    During the investigation of radiation fingerprint comparison, it is found out that the popular gamma spectra analysis softwares are faultful, which decrease the precision of radiation fingerprint comparison. So a new analysis software is development for solving the problems. In order to display the advantage of new program, some typical simulative gamma spectra of radiation source are analyzed respectively by our software and GAMMAVISION and GENNIE2000. The software can be applied not only in nuclear warheads deep-cuts verification, but also in any radiation measurement field. (authors)

  10. Raman spectra studies of dipeptides

    International Nuclear Information System (INIS)

    Blanchard, Simone.

    1977-10-01

    This work deals with the homogenous and heterogeneous dipeptides derived from alanine and glycine, in the solid state or in aqueous solutions, in the zwitterions or chlorhydrates form. The Raman spectra comparative study of these various forms of hydrogenated or deuterated compounds allows to specify some of the attributions which are necessary in the conformational study of the like tripeptides. These compounds contain only one peptidic group; therefore there is no possibility of intramolecular hydrogen bond which caracterise vibrations of non bonded peptidic groups and end groups. Infrared spectra of solid dipeptides will be presented and discussed in the near future [fr

  11. Classical Trajectories and Quantum Spectra

    Science.gov (United States)

    Mielnik, Bogdan; Reyes, Marco A.

    1996-01-01

    A classical model of the Schrodinger's wave packet is considered. The problem of finding the energy levels corresponds to a classical manipulation game. It leads to an approximate but non-perturbative method of finding the eigenvalues, exploring the bifurcations of classical trajectories. The role of squeezing turns out decisive in the generation of the discrete spectra.

  12. Vibrational spectra of ordered perovskites

    NARCIS (Netherlands)

    Corsmit, A.F.; Hoefdraad, H.E.; Blasse, G.

    1972-01-01

    The vibrational spectra of the molecular M6+O6 (M = Mo, Te, W) group in ordered perovskites of the type Ba2M2+M6+O6 are reported. These groups have symmetry Oh, whereas their site symmetry is also Oh. An assignment of the internal vibrations is presented.

  13. Raman spectra of graphene ribbons

    International Nuclear Information System (INIS)

    Saito, R; Furukawa, M; Dresselhaus, G; Dresselhaus, M S

    2010-01-01

    Raman spectra of graphene nanoribbons with zigzag and armchair edges are calculated within non-resonant Raman theory. Depending on the edge structure and polarization direction of the incident and scattered photon beam relative to the edge direction, a symmetry selection rule for the phonon type appears. These Raman selection rules will be useful for the identification of the edge structure of graphene nanoribbons.

  14. Explanation of earthquake response spectra

    OpenAIRE

    Douglas, John

    2017-01-01

    This is a set of five slides explaining how earthquake response spectra are derived from strong-motion records and simple models of structures and their purpose within seismic design and assessment. It dates from about 2002 and I have used it in various introductory lectures on engineering seismology.

  15. Skyshine spectra of gamma rays

    International Nuclear Information System (INIS)

    Swarup, Janardan

    1980-01-01

    A study of the spectra of gamma photons back-scattered in vertical direction by infinite air above ground (skyshine) is presented. The source for these measurements is a 650 Ci Cobalt-60 point-source and the skyshine spectra are reported for distances from 150 m to 325 m from the source, measured with a 5 cm x 5 cm NaI(Tl) detector collimated with collimators of 12 mm and 20 mm diameter and 5 cm length. These continuous spectra are unfolded with Gold's iterative technique. The photon-spectra so obtained have a distinct line at 72 keV due to multiply-scattered photons. This is an energy where photoelectric and Compton cross-sections for multiply-scattered photons balance each other. The intensity of the line(I) decreases exponentially with distance (d) from the source obeying a relation of the type I = Isub(o)esup(-μd) where μ is called as ''Multiply-Scatter Coefficient'', a constant of the medium which is air in these measurements. This relationship is explained in terms of a halo around the source comprising of multiply-scattered gamma photons, Isub(0) being the intensity of these scattered photons at the location of cobalt-source. A fraction called as ''Back-scattered Fraction'', the ratio of Isub(0) to the number of original photons from the cobalt-source entering the infinite air, is also calculated. It is shown that with a properly calibrated detector system, this fraction can be used to determine the strength of a large gamma source, viz. a nuclear explosion in air, and for mineral prospecting. These conclusions are general and can be applied to any other infinite medium. Some forward-scatter (transmission) spectra of cobalt-60 source through 10 cm of Pb and 2.5 cm of Al are also reported. (auth.)

  16. Betalactamasas de espectro extendido tipo TEM y CTX-M en Klebsiella spp y Escherichia coli aisladas de superficies de ambientes hospitalarios

    Directory of Open Access Journals (Sweden)

    Marco Rivera-Jacinto

    Full Text Available El objetivo del estudio fue determinar el genotipo BLEE de 15 cepas de enterobacterias resistentes a betalactámicos, aisladas de superficies inanimadas y caracterizadas fenotípicamente como productoras de betalactamasas de espectro extendido. Previa evaluación y tamizaje de las cepas bacterianas, se hizo un PCR para amplificar fragmentos de 1078 pb y 544 pb correspondientes a BLEE tipo TEM y CTX-M. Once cepas presentaron ambos fragmentos a la vez y tres presentaron solamente blaCTX-M. En conclusión, se demostró la presencia de genes BLEE en cultivos de origen ambiental, algunos de los cuales podrían pertenecer a más de un tipo; esta información podría servir de base para implementar medidas de prevención que eviten la trasmisión de bacterias multirresistentes desde superficies inanimadas a los pacientes, principalmente en áreas hospitalarias críticas

  17. O Fenótipo Ampliado do Autismo em genitores de crianças com Transtorno do Espectro Autista - TEA

    Directory of Open Access Journals (Sweden)

    Renata Giuliani Endres

    Full Text Available RESUMOPesquisadores têm identificado expressões mais leves de traços do Transtorno do Espectro do Autismo - TEA em pais e irmãos destes indivíduos, que são definidas como Fenótipo Ampliado do Autismo (FAA. Este estudo investigou o perfil de personalidade de 20 genitores de crianças com o diagnóstico de TEA, utilizando a Bateria Fatorial de Personalidade e o Broad Autism Phenotype Questionnaire. Os resultados apontam para a presença de alguns traços de personalidade (ex: tendência à rigidez e ao retraimento social que podem, em alguma medida, corresponder às áreas de comprometimento presentes no TEA. Estes achados refletem um campo promissor de estudos no Brasil, sobretudo porque se utilizou um instrumento brasileiro, ainda não empregado em investigações na área do autismo.

  18. Determination of the neutron spectrum at different locations in the Argentine RA-1 Reactor; Determinacion del espectro neutronico en distintas posiciones del reactor RA-1

    Energy Technology Data Exchange (ETDEWEB)

    Lerner, A M; Madariaga, M R [Autoridad Regulatoria Nuclear, Buenos Aires (Argentina)

    1999-12-31

    Radiodosimetria de la Autoridad Regulatoria Nuclear (ARN) utiliza la columna rapida del reactor para el disenio, calibracion y puesta a punto de dosimetros de criticidad asi como de los metodos de evaluacion rapida de las dosis absorbida por el personal en el caso de accidentes. Con este objeto se irradiaron hojuelas de Au(1), Au bajo Cd e In(2), para estimar los flujos neutronicos absolutos termico, epitermico y rapido respectivamente en la posicion de irradiacion. Esta estimacion es tanto mas precisa cuanto mejor se conocen las respuestas de los distintos materiales de los detectores al espectro de neutrones presente. Esto a su vez requiere el conocimiento previo de dicho espectro (dependencia detallada del flujo neutronico con la energia) en la posicion que se analiza. En este trabajo se presenta el calculo neutronico que fue oportunamente requerido al Grupo de Reactores de Investigacion y Conjuntos Criticos de la ARN, con el objeto de determinar el espectro neutronico en la posicion de irradiacion rapida del RA-1. Se ha evaluado el espectro neutronico en diferentes posiciones del reactor, utilizando dos lineas de calculo diferentes y considerando, a los fines de este analisis, una potencia de 40 kW. Se ha representado al reactor y al recinto que lo aloja con un modelo simplificado, unidimensional, como un conjunto de regiones circulares concentricas. Se muestran los graficos de los flujos rapido y termico (con corte en 0,4 eV) en funcion de la distancia al centro del reactor. Se muestra asimismo el grafico del flujo neutronico (en n/cm{sup 2}.seg.eV) en funcion de la energia en la posicion de irradiacion rapida. Se consignan tambien los valores del flujo (en n/cm{sup 2}.seg.eV) en funcion de la energia en otras posiciones tipicas, asi como los valores equivalentes de los flujos integrados (en n/cm{sup 2}.seg). ((1) De acuerdo con la reaccion Au{sup 197}(n, {gamma})Au{sup 198}, con una seccion eficaz de {sigma}{sub 0}=98.8b para neutrones termicos. (2) De acuerdo con la

  19. INCLUSÃO ESCOLAR DE CRIANÇAS COM TRANSTORNO DO ESPECTRO AUTISTA: UMA REVISÃO SISTEMÁTICA DA LITERATURA

    Directory of Open Access Journals (Sweden)

    Cristiane Soares Cabral

    Full Text Available RESUMO: Este estudo teve como objetivo realizar uma revisão sistemática da literatura nacional e internacional quanto a artigos de periódicos científicos sobre a inclusão escolar de crianças com Transtorno do Espectro Autista (TEA, atentando-se para o período e o periódico, os temas investigados e suas metodologias. Foram localizados 25 estudos nacionais, nas bases LILACS, BVS, SCIELO e Portal de Periódicos da CAPES, publicados entre 1998 e 2014, e 92 internacionais, localizados nas bases EBSCOhost e Medline, publicados entre 1993 e 2013. As pesquisas nacionais e internacionais foram agrupadas de acordo com os temas de investigação e os seus objetivos. A maioria dos estudos localizados caracterizou-se como empírico e de abordagem qualitativa. De modo geral, a revisão da literatura realizada possibilitou o resgate de experiências sobre a inclusão escolar de crianças com TEA, além de esboçar um breve panorama dos principais temas que estão sendo investigados.

  20. Relaciones interpersonales en niños y jóvenes con trastornos del espectro del autismo y discapacidad intelectual

    Directory of Open Access Journals (Sweden)

    Lucía Morán Suárez

    2015-06-01

    Full Text Available Las personas con discapacidad severa y profunda han sido un colectivo poco estudiado en el ámbito de la investigación y, menos aún, en las etapas de la infancia y adolescencia. Este estudio evalúa las relaciones interpersonales de una muestra de 55 personas con Trastorno del Espectro Autismo (TEA y discapacidad intelectual (DI entre 4 y 20 años. Para ello se utilizó la subescala de relaciones interpersonales de la Escala KidsLife (Gómez et al., en prensa que evalúa calidad de vida. Las puntuaciones más altas se obtuvieron en los ítems relacionados con la comunicación, mientras que las más bajas se observaron en los ítems relacionados con las interacciones sociales. Además, las personas con DI profunda obtuvieron puntuaciones significativamente más bajas que aquellos con mayores niveles de funcionamiento. Se discute acerca de las implicaciones del estudio y se realizan recomendaciones específicas para mejorar las prácticas profesionales y organizacionales dirigidas a la mejora de la calidad de vida.

  1. La inclusión educativa desde la voz de madres de estudiantes con Trastornos del Espectro Autista en una muestra chilena

    Directory of Open Access Journals (Sweden)

    Marcela Villegas Otárola

    2014-12-01

    Full Text Available El objetivo del estudio es mostrar la perspectiva de madres chilenas sobre la inclusión educativa de sus hijos escolarizados en centros de educación primaria, quienes presentan un Trastorno del Espectro Autista. Se recogen evidencias, desde la voz de las familias, que pueden servir como punto de partida para reflexionar sobre cómo avanzar hacia una educación más inclusiva y cómo contribuir a mejorar los apoyos que se brindan a estudiantes con discapacidad. El estudio se enmarca en un paradigma cualitativo de investigación, utilizando entrevistas no estructuradas para acceder a la información. Se ha contado con la participación de ocho madres chilenas de la Región de Valparaíso. Los resultados muestran que la valoración de la escolarización está estrechamente relacionada con el bienestar emocional, ámbito al que se le otorga mayor relevancia que al de los resultados académicos. Se destaca la importancia de los apoyos adaptados a las necesidades del sistema familiar.

  2. Neutron spectrum for neutron capture therapy in boron; Espectro de neutrones para terapia por captura de neutrones en boro

    Energy Technology Data Exchange (ETDEWEB)

    Medina C, D.; Soto B, T. G. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Programa de Doctorado en Ciencias Basicas, 98068 Zacatecas, Zac. (Mexico); Baltazar R, A. [Universidad Autonoma de Zacatecas, Unidad Academica de Ingenieria Electrica, Programa de Doctorado en Ingenieria y Tecnologia Aplicada, 98068 Zacatecas, Zac. (Mexico); Vega C, H. R., E-mail: dmedina_c@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas, Zac. (Mexico)

    2016-10-15

    Glioblastoma multiforme is the most common and aggressive of brain tumors and is difficult to treat by surgery, chemotherapy or conventional radiation therapy. One treatment alternative is the Neutron Capture Therapy in Boron, which requires a beam modulated in neutron energy and a drug with {sup 10}B able to be fixed in the tumor. When the patients head is exposed to the neutron beam, they are captured by the {sup 10}B and produce a nucleus of {sup 7}Li and an alpha particle whose energy is deposited in the cancer cells causing it to be destroyed without damaging the normal tissue. One of the problems associated with this therapy is to have an epithermal neutrons flux of the order of 10{sup 9} n/cm{sup 2}-sec, whereby irradiation channels of a nuclear research reactor are used. In this work using Monte Carlo methods, the neutron spectra obtained in the radial irradiation channel of the TRIGA Mark III reactor are calculated when inserting filters whose position and thickness have been modified. From the arrangements studied, we found that the Fe-Cd-Al-Cd polyethylene filter yielded a ratio between thermal and epithermal neutron fluxes of 0.006 that exceeded the recommended value (<0.05), and the dose due to the capture gamma rays is lower than the dose obtained with the other arrangements studied. (Author)

  3. Effects of X-rays spectrum on the dose; Efectos del espectro de rayos X sobre la dosis

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez I, J. L.; Hernandez A, P. L.; Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Rivera M, T., E-mail: johann_greenday@hotmail.com [IPN, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Av. Legaria No. 694, 11500 Mexico D. F. (Mexico)

    2015-10-15

    The X-ray equipment for diagnosis comes in different sizes and shapes depending on the scan type to perform. The X-ray spectrum is the energy distribution of the beam photons and consists of a continuous spectrum of photons braking and discrete spectrum due to the characteristic photons. The knowledge of the X-rays spectrum is important to understand like they affect the voltage changes (k Vp), current (m A), time (s) and the type of filter in the interaction mechanisms between X-rays and patient's body, the image receptor or other material that gets in the beam. Across the spectrum can be estimated the absorbed dose in any point of the patient, the quality of the image and the scattered radiation (which is related to the dose received by the equipment operator). The Monte Carlo method was used by MCNP5 code to calculate the spectrum of X-rays that occurs when a monoenergetic electron beam of 250 keV interact with targets of Mo, Rh and W. The spectra were calculated with and without filter, and the values of ambient dose equivalent were estimated, as well as the air kerma. (Author)

  4. ACCELERATED FITTING OF STELLAR SPECTRA

    Energy Technology Data Exchange (ETDEWEB)

    Ting, Yuan-Sen; Conroy, Charlie [Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Rix, Hans-Walter [Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany)

    2016-07-20

    Stellar spectra are often modeled and fitted by interpolating within a rectilinear grid of synthetic spectra to derive the stars’ labels: stellar parameters and elemental abundances. However, the number of synthetic spectra needed for a rectilinear grid grows exponentially with the label space dimensions, precluding the simultaneous and self-consistent fitting of more than a few elemental abundances. Shortcuts such as fitting subsets of labels separately can introduce unknown systematics and do not produce correct error covariances in the derived labels. In this paper we present a new approach—Convex Hull Adaptive Tessellation (chat)—which includes several new ideas for inexpensively generating a sufficient stellar synthetic library, using linear algebra and the concept of an adaptive, data-driven grid. A convex hull approximates the region where the data lie in the label space. A variety of tests with mock data sets demonstrate that chat can reduce the number of required synthetic model calculations by three orders of magnitude in an eight-dimensional label space. The reduction will be even larger for higher dimensional label spaces. In chat the computational effort increases only linearly with the number of labels that are fit simultaneously. Around each of these grid points in the label space an approximate synthetic spectrum can be generated through linear expansion using a set of “gradient spectra” that represent flux derivatives at every wavelength point with respect to all labels. These techniques provide new opportunities to fit the full stellar spectra from large surveys with 15–30 labels simultaneously.

  5. Reconstruction of neutron spectra through neural networks

    International Nuclear Information System (INIS)

    Vega C, H.R.; Hernandez D, V.M.; Manzanares A, E.

    2003-01-01

    A neural network has been used to reconstruct the neutron spectra starting from the counting rates of the detectors of the Bonner sphere spectrophotometric system. A group of 56 neutron spectra was selected to calculate the counting rates that would produce in a Bonner sphere system, with these data and the spectra it was trained the neural network. To prove the performance of the net, 12 spectra were used, 6 were taken of the group used for the training, 3 were obtained of mathematical functions and those other 3 correspond to real spectra. When comparing the original spectra of those reconstructed by the net we find that our net has a poor performance when reconstructing monoenergetic spectra, this attributes it to those characteristic of the spectra used for the training of the neural network, however for the other groups of spectra the results of the net are appropriate with the prospective ones. (Author)

  6. Biological Action Spectra (invited paper)

    Energy Technology Data Exchange (ETDEWEB)

    Gruijl, F.R. de

    2000-07-01

    Ultraviolet (UV) radiation induces a wide variety of biological responses: ranging in humans from well-known short-term effects like sunburn to long-term effects like skin cancer. The wavelength dependencies ('action spectra') of the responses can differ significantly, depending on the UV-targeted molecules (their absorption spectra), their localisation (transmission to the target depth) and the photochemical reactions involved (e.g. quantum yields, competing reaction). An action spectrum (e.g. of sunburn) is usually determined in a wavelength by wavelength analysis of the response. This is not always possible (e.g. in case of skin cancer), and an action spectrum may then be extracted mathematically from differences in responses to broadband UV sources of various spectral compositions (yielding 'biological spectral weights'). However, relative spectral weights may shift with exposure levels and contributions from different wavelengths may not always add up. Under these circumstances conventional analyses will yield different action spectra for different experimental conditions. (author)

  7. Measurements of the neutron energy spectra in the core of IPEN/MB-01 reactor; Medida do espectro de energia dos neutrons no nucleo do reator IPEN/MB-01

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Fernando Prat Goncalves

    2006-07-01

    This work presents the neutron spectrum measurements in the Reactor IPEN/MB-01 using very thin activation detectors in the metallic form, in reactor core, in moderator region. An articulated device allows that the foils are inserted in the central position of reactor core, ensuring that all the foils are irradiated in the same position. The activation detectors of different materials such Au{sup 197}, Mg{sup 24}, Ti{sup 4}'8, In{sup 115}, Sc{sup 45} and others, were selected to cover a large range of neutron spectrum. After the irradiation, the activation detectors were submitted to a spectrometry gamma by using a system of counting with high purity Germanium, to obtain the saturation activity per target nuclide. The saturation activity is one of the main data of input of unfolding code SANDBP, that through an iterative adjustment, modify the spectrum that better agree with the dataset of code input, composition mainly for measure reaction rate per target nuclide and a initial input spectrum, calculated for Hammer-Technion code, supplying a solution spectrum. (author)

  8. Determination of the neutron spectra in the treatment room of a linear accelerator for radiotherapy; Determinacion de los espectros de neutrones en la sala de tratamiento de un acelerador lineal para radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H.R. [Universidad Autonoma de Zacatecas, Cuerpo Academico de Radiobiologia, A.P. 336, 98000 Zacatecas (Mexico); Barquero, R. [Hospital Universitario Rio Hortega, Valladolid (Spain); Mendez, R.; Iniguez, M.P. [Depto. de Fisica Teorica, Atomica, Molecular y Nuclear, Universidad de Valladolid, 47011 Valladolid (Spain)

    2003-07-01

    By means of a series of measures and Monte Carlo calculations the dosimetric characteristics of the photoneutrons have been determined that take place in volume to a linear accelerator of radiotherapy of 18 MV, LINAC, mark Siemens Mevatron model. The measures were carried out with thermoluminescent dosemeters TLD 600 and TLD 700 that were naked exposed and confined with cover of Cd and Sn, inside a sphere of paraffin and inside spheres Bonner. (Author)

  9. Powderspec, a program for the efficient simulation of spectra of electron paramagnetic resonance of powders with orthorhombic symmetry; Powderspec, un programa para la simulacion eficiente de espectros de resonancia paramagnetica electronica de polvos con simetria ortorrombica

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez T, L.; Beltran L, V

    1991-09-15

    In this report a FORTRAN source program which simulates the second order powder pattern and spectrum of electron paramagnetic resonance (EPR) in crystal fields with orthorhombic symmetry using Gauss-Legendre quadratures is given. Also the commentaries which describe each step in detail are presented. (Author)

  10. Measurements of the neutron energy spectra in the core of IPEN/MB-01 reactor; Medida do espectro de energia dos neutrons no nucleo do reator IPEN/MB-01

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Fernando Prat Goncalves

    2006-07-01

    This work presents the neutron spectrum measurements in the Reactor IPEN/MB-01 using very thin activation detectors in the metallic form, in reactor core, in moderator region. An articulated device allows that the foils are inserted in the central position of reactor core, ensuring that all the foils are irradiated in the same position. The activation detectors of different materials such Au{sup 197}, Mg{sup 24}, Ti{sup 4}'8, In{sup 115}, Sc{sup 45} and others, were selected to cover a large range of neutron spectrum. After the irradiation, the activation detectors were submitted to a spectrometry gamma by using a system of counting with high purity Germanium, to obtain the saturation activity per target nuclide. The saturation activity is one of the main data of input of unfolding code SANDBP, that through an iterative adjustment, modify the spectrum that better agree with the dataset of code input, composition mainly for measure reaction rate per target nuclide and a initial input spectrum, calculated for Hammer-Technion code, supplying a solution spectrum. (author)

  11. Espectro trófico de la tilapia Oreochromis aureus (Perciformes: Cichlidae en la presa Infiernillo, Michoacán-Guerrero, México

    Directory of Open Access Journals (Sweden)

    Ma. de Lourdes Jiménez-Badillo

    2000-06-01

    Full Text Available Se determinó el espectro trófico de la tilapia Oreochromis aureus (Steindachner 1864, a través del análisis del contenido estomacal de una muestra de 153 especímenes recolectados durante 1993. El estado de alimentación se evaluó por la proporción de grasa alrededor del estómago e intestino, la replexión gástrica y el coeficiente de condición. La evaluación cuantitativa del alimento, se realizó a través de los métodos Volumétrico (V y Frecuencia de Aparición (FA y los Indices Medio Volumétrico (IMV e Importancia Relativa (IIR, los cuales se combinaron para determinar el espectro trófico de la tilapia. Se determinó que su dieta en la presa Infiernillo está constituida por: detritus y plantas vasculares como alimentos preferentes; algas unicelulares como alimento secundario y peces, insectos, semillas de gramíneas, algas filamentosas, cladóceros, ostrácodos, rotíferos y copépodos, como alimentos ocasionales. Se detectaron diferencias alimentarias entre juveniles y adultos y variaciones en el consumo de elementos alimentarios en la época de secas y lluvias. Se concluye que Oreochromis aureus es una especie omnívora con preferencia hacia el detritus y los restos de plantas vasculares. La alimentación esta determinada por la abundancia de las presas en el medio y en los adultos se basa preferentemente en el detritus. La alimentación no es un factor que limite el desarrollo de la tilapia en la presa Infiernillo.The trophic spectrum of tilapia Oreochromis aureus (Steindachner 1864, was determined by stomach content analysis in 153 organisms collected during 1993 in Michoacán-Guerrero, México. The feeding status of the fish at the time of observation was evaluated by the examination of fat surrounding the gut, gastric replection and the condition coefficient. The quantitative evaluation of the food items was carried out by the combination of the following analysis: Frequency of Occurrence, Volumetric Method, Volumetric

  12. Perfil pragmático longitudinal de uma criança no espectro da neuropatia auditiva Longitudinal pragmatic profile of a child with auditory neuropathy spectrum disorder

    Directory of Open Access Journals (Sweden)

    Andreza Carolina Bretanha

    2011-06-01

    Full Text Available A maior parte da comunicação humana depende da conversão de ideias em linguagem, envolvendo a interação de todos os seus componentes - fonológico, semântico, sintático e pragmático. A pragmática estuda a relação entre o significado social da linguagem e seu conteúdo semântico, manifestado pelo ato comunicativo em si. O espectro da neuropatia auditiva gera uma dessincronia na condução nervosa, contribuindo para o prejuízo na percepção da fala. Na criança deficiente auditiva, o processo de aquisição e desenvolvimento da linguagem pode ser estimulado com a intervenção. O objetivo dessa pesquisa foi realizar acompanhamento longitudinal do uso das habilidades pragmáticas de comunicação por uma criança com espectro da neuropatia auditiva. A criança realizou intervenção fonoaudiológica por três anos na área de Audiologia Educacional. Foram gravadas conversações espontâneas, ao início de cada ano, transcritas e analisadas segundo protocolo de habilidades comunicativas verbais. Na gravação inicial, a criança apresentou maior número de habilidade de respostas diretas; porém, estas foram ampliadas com o fornecimento de respostas mais complexas ao longo da intervenção. Na última gravação, já propõe novos tópicos de discurso, realiza narrativas e argumentações. O surgimento de habilidades comunicativas refinadas é explicado pelo desenvolvimento da linguagem, que é potencializado pela terapia com deficientes auditivos. Pode-se concluir que para o caso apresentado a intervenção fonoaudiológica proporcionou melhora nas habilidades pragmáticas de comunicação.Human communication depends mostly on the conversion of ideas into language, involving the interaction among all its components - phonological, semantic, syntactic and pragmatic. Pragmatics studies the relationship between the social meaning of language and its semantic content, expressed by the communicative act itself. Auditory neuropathy

  13. Epidemiología molecular de infección nosocomial por Klebsiella pneumoniae productora de beta-lactamasas de espectro extendido.

    Directory of Open Access Journals (Sweden)

    Paula Andrea Espinal

    2004-09-01

    Full Text Available La epidemiología molecular aplicada al estudio de las infecciones nosocomiales ha sido fundamental para la formulación y la evaluación de las medidas de control; con este fin, se caracterizaron microbiológica y molecularmente aislamientos de Klebsiella pneumoniae productores de beta-lactamasas de espectro extendido (BLEE obtenidos de pacientes en un hospital de tercer nivel de Bogotá, D.C., Colombia. Se tipificaron quince aislamientos por electroforesis en gel de campo pulsado (PFGE y por amplificación de secuencias de ADN repetidas (REP-PCR. La susceptibilidad antimicrobiana y la producción de BLEE se determinaron de acuerdo con las normas de NCCLS. Las beta-lactamasas se evaluaron por isoelectroenfoque y PCR. El 80% de estos aislamientos se asociaron con infección nosocomial y de éstos, el 91,7% provenía de unidades de cuidado intensivo. La susceptibilidad antibiótica mostró 13 patrones de resistencia; 87% de los aislamientos presentó corresistencia a amikacina, 53% a gentamicina, 33,3% a ciprofloxacina, 40% a cefepime, 66,7% a piperacilina/tazobactam, 60% trimetoprim/sulfametoxazol y 46,7% a cloranfenicol. Todos fueron sensibles a imipenem. En la mayoría de los aislamientos se detectó producción simultánea de beta-lactamasas del tipo TEM y SHV y el 93,3% produjo ceftazidimasa de pI 8.2 del tipo SHV-5. Los 15 aislamientos fueron agrupados por PFGE y REP-PCR en 11 y 12 patrones electroforéticos, respectivamente. Esta variabilidad genética está relacionada con infecciones nosocomiales de origen endógeno más que por infecciones cruzadas.

  14. A mediação lúdica no espectro autista: uma possibilidade comunicativa e de intervenção psicopedagógica

    Directory of Open Access Journals (Sweden)

    Ana Beatriz Machado de Freitas

    2009-04-01

    Full Text Available O artigo relata a experiência profissional da autora junto a três crianças com espectro autista que freqüentavam uma clínica-escola para pessoas com deficiência mental. Não havia, entretanto, um programa específico voltado às necessidades das crianças com quadro autístico. Propôs-se, então, um atendimento mais sistemático e diretivo. Foi percebido, entretanto, que antes de qualquer implementação era necessária a construção de vínculos. Assim, a autora iniciou atendimentos psicopedagógicos individualizados de cunho lúdico seguindo as predileções e focos de interesse de cada criança, procurando interagir e brincar. O objetivo prioritário passou a ser a constituição de vínculo interpessoal e com o espaço de modo a favorecer a percepção e interatividade com o meio – físico e humano. A autora partiu da premissa, ancorada na experiência pessoal e em fundamentos teóricos psicológicos e psicopedagógicos, que a atenção compartilhada, a comunicação e a aprendizagem se constituem à medida que o sujeito interage e aprende a brincar em contextos significativos e sob mediação, produzindo sentidos de afetividade. Palavras-chave: Autismo. Psicopedagogia. Educação Especial. Ludoterapia.

  15. VALE-Emotions: Aplicación móvil de enseñanza para individuos con Desordenes del Espectro Autista

    Directory of Open Access Journals (Sweden)

    Diana Olmedo-Vizueta

    2017-02-01

    Full Text Available En este artículo, se presenta el desarrollo de una aplicación móvil interactiva para fortalecer el aprendizaje de reconocimiento de emociones en niños con Desordenes del Espectro Autista (ASD, en inglés. Esta App forma parte de un Avanzado Ambiente Virtual de Aprendizaje (VALE, en inglés, propuesto por los autores para soportar actividades de enseñanza y aprendizaje. La App VALE-Emotions está fundamentada en las seis emociones básicas estudiadas por (Paul Ekman, 1992, pero no está limitada solo al reconocimiento de tales emociones en sus máximos niveles de intensidad. De hecho, la App permite determinar el reconocimiento efectivo de estas emociones a diferentes niveles de intensidad. Tales niveles de intensidad son generados por una codificación propuesta por los autores mediante un DFE (Expresiones Faciales Dinámicas, en español usando avatars virtuales. Cada actividad de aprendizaje es realizada a través de aplicaciones de entrenamiento y evaluación, dando la oportunidad a los usuarios de desarrollar, aprender y fortalecer libremente habilidades sociales de una manera entretenida.  Además, se reportan los resultados de experimentación usando VALE-Emotions en individuos con ASD. En general, los participantes mostraron una eficiente respuesta a los estímulos durante las actividades desarrolladas obteniendo un alto y rápido reconocimiento de ciertas emociones.

  16. Trastorno del espectro autista y trastorno específico del lenguaje ¿Dos entidades diferentes o un continuo de manifestaciones neuropsicológicas?

    Directory of Open Access Journals (Sweden)

    Newra Tellechea Rotta

    2013-09-01

    Full Text Available El estudio de los niños con retraso en el desarrollo del lenguaje amerita un gran conocimiento del desarrollo neurológico típico; muchas veces, niños con retraso del lenguaje pueden presentar dificultades sociales y conductuales y puede ser difícil, en especial en etapas tempranas, diferenciar entre trastorno del espectro autista (TEA y trastorno específico del lenguaje (TEL. Justamente por ello, teniendo en cuenta que muchas veces comparten síntomas comunes se ha postulado que estos trastornos podrían tener una base etiológica común. En este trabajo analizaré en base a una revisión de la literatura, los aspectos clínicos, los avances en técnicas de diagnóstico y las investigaciones más recientes en las áreas de los TEA y TEL con el objeto de aclarar aspectos que hagan a su diagnóstico más preciso. No obstante, a pesar de los importantes contribuciones en el área de la observación clínica y de estudios complementarios, quedan todavía muchas dificultades para poder identificar tempranamente a estos niños, en especial antes de los dos años de vida, momento en que aún no podemos definir más que si un niño está en riesgo de padecer autismo o si tiene solo un retraso en el desarrollo de su lenguaje con algunas dificultades sociales.

  17. “COOPEDALEANDO”: UNA ACTIVIDAD FÍSICA EN BICICLETA PARA NIÑOS Y NIÑAS CON TRASTORNOS DEL ESPECTRO AUTISTA

    Directory of Open Access Journals (Sweden)

    Irene María Villalba Urbaneja,

    2015-05-01

    Full Text Available Las personas con necesidades educativas especiales, particularmente con Trastornos del Espectro Autista (TEA, se han sentido alejados de las actividades físicas y lúdicas, a pesar de que la legislación vigente exige tenerlos en cuenta (Ley Orgánica 2/2006.El autismo es “una de las alteraciones más graves del desarrollo durante la primera infancia que constituye uno de los problemas más serios desde el punto de vista personal, familiar y social” (Crespo, 2001. Según señala el DSM-IV-TR (2000, los TEA son una serie de Trastornos Neuropsiquiátricos catalogados como Trastornos Generalizados del Desarrollo. Por todo ello, “todos los sujetos que presentan rasgos autistas tienen una enorme necesidad de practicar y desarrollar sus capacidades motoras de manera regular y el deterioro de las mismas es consecuencia de su discapacidad en establecer mecanismos propios para desarrollarlas por medio de juegos, educación psicomotriz o actividad física” (Molina, 2006.“Coopedalenado” fue una propuesta físico-educativa llevada a cabo con los niños y niñas de la Asociación Autismo Palencia durante el año 2014 en las instalaciones deportivas del Complejo Universitario de La Yutera, Palencia.Objetivos: Desarrollar las Habilidades Motrices Básicas y las Habilidades Perceptivas de los participantes, Mejorar las Habilidades Sociales a partir de actividades físicas específicamente diseñadas; Adquirir una mayor autonomía en el área psíquico y sensorial a partir de su estimulación.

  18. Design spectra development considering short time histories

    International Nuclear Information System (INIS)

    Weiner, E.O.

    1983-01-01

    The need for generation of seismic acceleration histories to prescribed response spectra arises several ways in structural dynamics. For example, one way of obtaining floor spectra is to generate a history from a foundation spectra and then solve for the floor motion from which a floor spectrum can be obtained. Two separate programs, MODQKE and MDOF, were written to provide a capability of obtaining equipment spectra from design spectra. MODQKE generates or modifies acceleration histories to conform with design spectra pertaining to, say, a foundation. MDOF is a simple linear modal superposition program that solves for equipment support histories using the design spectra conforming histories as input. Equipment spectra, then, are obtained from the support histories using MODQKE

  19. Gamma-ray burst spectra

    International Nuclear Information System (INIS)

    Teegarden, B.J.

    1982-01-01

    A review of recent results in gamma-ray burst spectroscopy is given. Particular attention is paid to the recent discovery of emission and absorption features in the burst spectra. These lines represent the strongest evidence to date that gamma-ray bursts originate on or near neutron stars. Line parameters give information on the temperature, magnetic field and possibly the gravitational potential of the neutron star. The behavior of the continuum spectrum is also discussed. A remarkably good fit to nearly all bursts is obtained with a thermal-bremsstrahlung-like continuum. Significant evolution is observed of both the continuum and line features within most events

  20. Wavelet spectra of JACEE events

    International Nuclear Information System (INIS)

    Suzuki, Naomichi; Biyajima, Minoru; Ohsawa, Akinori.

    1995-01-01

    Pseudo-rapidity distributions of two high multiplicity events Ca-C and Si-AgBr observed by the JACEE are analyzed by a wavelet transform. Wavelet spectra of those events are calculated and compared with the simulation calculations. The wavelet spectrum of the Ca-C event somewhat resembles that simulated with the uniform random numbers. That of Si-AgBr event, however, is not reproduced by simulation calculations with Poisson random numbers, uniform random numbers, or a p-model. (author)

  1. Uranium spectra in the ICP

    Energy Technology Data Exchange (ETDEWEB)

    Ghazi, A.A.; Qamar, S.; Atta, M.A. (Khan (A.Q.) Research Labs., Rawalpindi (Pakistan))

    1994-05-01

    Uranium spectra have been studied by inductively coupled plasma atomic emission spectroscopy (ICP-AES). In total, 8361 uranium lines were observed in the wavelength range of 235-500 nm. This article is an electronic publication in Spectrochimica Acta Electronica (SAE), the electronic section of Spectrochimica Acta Part B (SAB). The hard copy text is accompanied by a disk with data files and test files for an IBM-compatible computer. The main article discusses the scientific aspects of the subject and explains the purpose of the data files. (Author).

  2. Identified hadron spectra from PHOBOS

    Science.gov (United States)

    Veres, Gábor I.; the PHOBOS Collaboration; Back, B. B.; Baker, M. D.; Ballintijn, M.; Barton, D. S.; Becker, B.; Betts, R. R.; Bickley, A. A.; Bindel, R.; Busza, W.; Carroll, A.; Decowski, M. P.; García, E.; Gburek, T.; George, N.; Gulbrandsen, K.; Gushue, S.; Halliwell, C.; Hamblen, J.; Harrington, A. S.; Henderson, C.; Hofman, D. J.; Hollis, R. S.; Hołyński, R.; Holzman, B.; Iordanova, A.; Johnson, E.; Kane, J. L.; Khan, N.; Kulinich, P.; Kuo, C. M.; Lee, J. W.; Lin, W. T.; Manly, S.; Mignerey, A. C.; Nouicer, R.; Olszewski, A.; Pak, R.; Park, I. C.; Pernegger, H.; Reed, C.; Roland, C.; Roland, G.; Sagerer, J.; Sarin, P.; Sedykh, I.; Skulski, W.; Smith, C. E.; Steinberg, P.; Stephans, G. S. F.; Sukhanov, A.; Tonjes, M. B.; Trzupek, A.; Vale, C.; van Nieuwenhuizen, G. J.; Verdier, R.; Wolfs, F. L. H.; Wosiek, B.; Wozniak, K.; Wysłouch, B.; Zhang, J.

    2004-08-01

    Transverse momentum spectra of pions, kaons and protons, as well as antiparticle to particle ratios near mid-rapidity from d+Au collisions at \\sqrt{sNN} = 200 GeV have been measured by the PHOBOS experiment at RHIC. The transverse momentum range of particle identification was extended to beyond 3 GeV/c using the TOF detector and a new trigger system. The pseudorapidity dependence of the nuclear modification factor for charged hadrons in d+Au collisions is presented.

  3. Uranium spectra in the ICP

    International Nuclear Information System (INIS)

    Ghazi, A.A.; Qamar, S.; Atta, M.A.

    1994-01-01

    Uranium spectra have been studied by inductively coupled plasma atomic emission spectroscopy (ICP-AES). In total, 8361 uranium lines were observed in the wavelength range of 235-500 nm. This article is an electronic publication in Spectrochimica Acta Electronica (SAE), the electronic section of Spectrochimica Acta Part B (SAB). The hard copy text is accompanied by a disk with data files and test files for an IBM-compatible computer. The main article discusses the scientific aspects of the subject and explains the purpose of the data files. (Author)

  4. Operator functions and localization of spectra

    CERN Document Server

    Gil’, Michael I

    2003-01-01

    "Operator Functions and Localization of Spectra" is the first book that presents a systematic exposition of bounds for the spectra of various linear nonself-adjoint operators in a Hilbert space, having discrete and continuous spectra. In particular bounds for the spectra of integral, differential and integro-differential operators, as well as finite and infinite matrices are established. The volume also presents a systematic exposition of estimates for norms of operator-valued functions and their applications.

  5. Raman spectra of SDW superconductors

    Energy Technology Data Exchange (ETDEWEB)

    Rout, G.C. [Condensed Matter Physics Group, Department of Physics, Government Science College, Chatrapur, Orissa 761 020 (India)]. E-mail: gcr@iopb.res.in; Bishoyi, K.C. [P.G. Department of Physics, F.M. College (Autonomous), Balasore, Orissa 756 001 (India); Behera, S.N. [Institute of Physics, Bhubaneswar 751 005 (India)

    2005-03-15

    We report the calculation of the phonon response of the coexistent spin density wave (SDW) and superconducting (SC) state and predict the observation of SC gap in the Raman spectra of rare-earth nickel borocarbide superconductors. The SDW state normally does not couple to the lattice and hence, the phonons in the system are not expected to be affected by the SDW state. But there is a possibility of observing SC gap mode in the Raman spectra of a SDW superconductor due to the coupling of the SC gap excitation to the Raman active phonons in the system via the electron-phonon (e-p) interaction. A theoretical model is used for the coexistent phase and electron-phonon interaction. Phonon Green's function is calculated by Zubarev's technique and the phonon self-energy due to e-p interaction which is given by electron density response function in the coexistent state corresponding to the SDW wave vector q = Q is evaluated. The results so obtained exhibit agreement with the experimental observations.

  6. Raman spectra of SDW superconductors

    International Nuclear Information System (INIS)

    Rout, G.C.; Bishoyi, K.C.; Behera, S.N.

    2005-01-01

    We report the calculation of the phonon response of the coexistent spin density wave (SDW) and superconducting (SC) state and predict the observation of SC gap in the Raman spectra of rare-earth nickel borocarbide superconductors. The SDW state normally does not couple to the lattice and hence, the phonons in the system are not expected to be affected by the SDW state. But there is a possibility of observing SC gap mode in the Raman spectra of a SDW superconductor due to the coupling of the SC gap excitation to the Raman active phonons in the system via the electron-phonon (e-p) interaction. A theoretical model is used for the coexistent phase and electron-phonon interaction. Phonon Green's function is calculated by Zubarev's technique and the phonon self-energy due to e-p interaction which is given by electron density response function in the coexistent state corresponding to the SDW wave vector q = Q is evaluated. The results so obtained exhibit agreement with the experimental observations

  7. Eficacia y seguridad del aripiprazol en trastornos del espectro autista en población infanto-juvenil: revisión sistemática de la literatura

    OpenAIRE

    Parra Osorio, María del Pilar; Hoyos López, Violeta

    2015-01-01

    Aunque han pasado cinco años desde su aprobación en Estados Unidos para el manejo de los Trastornos del Espectro Autista (TEA), en Colombia el uso de aripiprazol para esta indicación continúa siendo off-label. En este contexto, se ha propuesto la ejecución de una revisión sistemática de la literatura con el fin de conocer la eficacia y seguridad de esta estrategia terapéutica a la luz de la evidencia disponible en el manejo de niños y adolescentes con TEA

  8. Relaciones tróficas, espectro alimentario y ración de alimentación de las principales especies pelágicas en el verano 1996

    OpenAIRE

    Alamo, Alejandro; Navarro, Iván; Espinoza, Pepe; Zubiate, Patricia

    1996-01-01

    Se analiza la dieta de Engraulis ringens, Sardinops sagax sagax, Trachurus picturatus murphyi, Scomber japonicus peruanus durante el verano de 1996. La ración diaria se determinó mediante el modelo de SAINSBURY (1986), utilizando el Software MAXIMS y el espectro alimentario siguiendo lo descrito por HYSLOP (1980). En la anchoveta y sardina los items presa estuvieron compuestos por copépodos de los géneros Centropages, Oncaea, Eucalanus y el crustáceo planctónico Euphausia mucronata entre los ...

  9. Habilidades funcionais de autocuidado, mobilidade e função social em crianças com fissura labiopalatina e Espectro Óculo-Aurículo-Vertebral (EOAV)

    OpenAIRE

    Luciana Alves de Souza Carvalho

    2016-01-01

    As anomalias craniofaciais ocasionam comprometimentos estéticos e funcionais com grande impacto na saúde e na integração social da criança, com interferência no desenvolvimento global e social. Das anomalias craniofaciais este estudo abordou as Fissuras Labiopalatinas (FLP) e o Espectro Óculo Aurículo Vertebral (EOAV). As FLP constituem malformações resultantes de falta do fechamento completo dos tecidos que compõe o lábio e o palato. O EOAV, também conhecido como Síndrome de Goldenhar, é um...

  10. La detección precoz de Trastornos del Espectro Autista (TEA). El programa de cribado con M-CHAT en España y revisión de otros programas en Europa

    OpenAIRE

    García Primo, Patricia

    2014-01-01

    [ES]Los Trastornos del Espectro Autista (TEA) constituyen un conjunto de alteraciones graves del desarrollo neurológico que se caracterizan por la concurrencia de dificultades en la interacción social y en la comunicación y por patrones restringidos y repetitivos de comportamiento, siendo una de las discapacidades del desarrollo más frecuentes en la infancia temprana. El trabajo aquí presentado es una compilación de cuatro publicaciones (un capítulo de libro en español y 3 artículos, 2 de ell...

  11. Programa de intervención de habilidades de interacción social para personas con trastorno del espectro autista de alto funcionamiento a través del teatro: "Sentimos como actuamos"

    OpenAIRE

    Casado Sabugo, María Cristina

    2013-01-01

    Este trabajo consiste en un programa-taller de intervención Psicopedagógica para adolescentes con Trastorno del Espectro Autista de alto funcionamiento en un contexto de educación no formal. El objetivo de esta propuesta es el entrenamiento de habilidades de interacción social a través del teatro, como vehículo para facilitar la inserción social de este colectivo. Está basado en el modelo de orientación ecológico de investigación-acción que permite un continuo seguimiento del programa y una r...

  12. Cambios en los índices de desarrollo del aprendizaje en niños pequeños con desórdenes del espectro autista / Changes in developmental rates of learning in young children with autistic spectrum disorders

    OpenAIRE

    Alessandri, Michael; Universidad de Miami (Estados Unidos)

    2002-01-01

    Se midieron los índices de desarrollo del aprendizaje en 20 niños pequeños con desórdenes del espectro autista, con una batería de pruebas objetivas de aprendizaje, lenguaje y adaptación, en un programa de intervención temprana. Estos niños recibieron entre tres y diez horas este programa altamente estructurado, con una estrategia básica de capacitación discreta por ensayo. Los datos obtenidos apoyan la hipótesis de que la intervención temprana con base conductual tiene un impacto tanto clíni...

  13. Bases genéticas de la discapacidad intelectual y los trastornos del espectro autista: aplicación de las nuevas tecnologías al análisis de variantes del número de copias (CNVs)

    OpenAIRE

    Quintela García, Inés

    2017-01-01

    La discapacidad intelectual (DI) es un trastorno del neurodesarrollo complejo y fenotípicamente heterogéneo caracterizado por deficiencias significativas en el funcionamiento intelectual y en las habilidades adaptativas de inicio en el período del desarrollo. El trastorno del espectro autista (TEA) es un trastorno del neurodesarrollo caracterizado por deficiencias en las habilidades para la comunicación, en la interacción social y en el desarrollo del lenguaje y por la presencia de intereses ...

  14. Health in informal caregivers of people with Autism Spectrum Disorder: intervention effects = Salud en cuidadores informales de personas con Trastorno del Espectro Autista: efectos de la intervención

    OpenAIRE

    Ruiz Robledillo, Nicolás

    2015-01-01

    Introducción En las últimas décadas se ha producido un incremento alarmante de la prevalencia del Trastorno del Espectro Autista (TEA) (Elsabbagh et al., 2012), caracterizado por dificultades en la socialización, la comunicación y un patrón de intereses y conductas restringidos y repetitivos (American Psychiatric Association, 2013). La especificidad de la sintomatología característica del TEA y los problemas de conducta que conllevan se asocian generalmente a diversos grados de discapacida...

  15. Atención a pacientes con trastorno del espectro autista en la unidad de urgencias pediátricas del Hospital Clínico Universitario de Valladolid propuesta de protocolo

    OpenAIRE

    Pérez Mateos, Sergio

    2017-01-01

    Los Trastornos del Espectro del Autismo (TEA) constituyen un conjunto amplio de alteraciones graves que afectan al neurodesarrollo, provocando deficiencias en la comunicación e interacción social. El concepto del TEA ha ido variando a lo largo de la historia, hasta su clasificación actual descrita por el Manual Diagnóstico y Estadístico de los Trastornos Mentales (DSM-V), que engloba el Trastorno Autista, el Síndrome de Asperger, el Trastorno Generalizado de la Infancia y el Trastorno Atíp...

  16. Multiscale climate emulator of multimodal wave spectra: MUSCLE-spectra

    Science.gov (United States)

    Rueda, Ana; Hegermiller, Christie A.; Antolinez, Jose A. A.; Camus, Paula; Vitousek, Sean; Ruggiero, Peter; Barnard, Patrick L.; Erikson, Li H.; Tomás, Antonio; Mendez, Fernando J.

    2017-02-01

    Characterization of multimodal directional wave spectra is important for many offshore and coastal applications, such as marine forecasting, coastal hazard assessment, and design of offshore wave energy farms and coastal structures. However, the multivariate and multiscale nature of wave climate variability makes this complex problem tractable using computationally expensive numerical models. So far, the skill of statistical-downscaling model-based parametric (unimodal) wave conditions is limited in large ocean basins such as the Pacific. The recent availability of long-term directional spectral data from buoys and wave hindcast models allows for development of stochastic models that include multimodal sea-state parameters. This work introduces a statistical downscaling framework based on weather types to predict multimodal wave spectra (e.g., significant wave height, mean wave period, and mean wave direction from different storm systems, including sea and swells) from large-scale atmospheric pressure fields. For each weather type, variables of interest are modeled using the categorical distribution for the sea-state type, the Generalized Extreme Value (GEV) distribution for wave height and wave period, a multivariate Gaussian copula for the interdependence between variables, and a Markov chain model for the chronology of daily weather types. We apply the model to the southern California coast, where local seas and swells from both the Northern and Southern Hemispheres contribute to the multimodal wave spectrum. This work allows attribution of particular extreme multimodal wave events to specific atmospheric conditions, expanding knowledge of time-dependent, climate-driven offshore and coastal sea-state conditions that have a significant influence on local nearshore processes, coastal morphology, and flood hazards.

  17. Scikit-spectra: Explorative Spectroscopy in Python

    Directory of Open Access Journals (Sweden)

    Adam Hughes

    2015-06-01

    Full Text Available Scikit-spectra is an intuitive framework for explorative spectroscopy in Python. Scikit-spectra leverages the Pandas library for powerful data processing to provide datastructures and an API designed for spectroscopy. Utilizing the new IPython Notebook widget system, scikit-spectra is headed towards a GUI when you want it, API when you need it approach to spectral analysis. As an application, analysis is presented of the surface-plasmon resonance shift in a solution of gold nanoparticles induced by proteins binding to the gold’s surface. Please refer to the scikit-spectra website for full documentation and support: http://hugadams.github.io/scikit-spectra/

  18. An RGB approach to extraordinary spectra

    Science.gov (United States)

    Grusche, Sascha; Theilmann, Florian

    2015-09-01

    After Newton had explained a series of ordinary spectra and Goethe had pointed out its complementary counterpart, Nussbaumer discovered a series of extraordinary spectra which are geometrically identical and colourwise analogous to Newton’s and Goethe’s spectra. To understand the geometry and colours of extraordinary spectra, the wavelength composition is explored with filters and spectroscopic setups. Visualized in a dispersion diagram, the wavelength composition is interpreted in terms of additive colour mixing. Finally, all spectra are simulated as the superposition of red, green, and blue images that are shifted apart. This RGB approach makes it easy to understand the complex relationship between wavelengths and colours.

  19. Different spectra with the same neutron source

    International Nuclear Information System (INIS)

    Vega C, H. R.; Ortiz R, J. M.; Hernandez D, V. M.; Martinez B, M. R.; Hernandez A, B.; Ortiz H, A. A.; Mercado, G. A.

    2010-01-01

    Using as source term the spectrum of a 239 Pu-Be source several neutron spectra have been calculated using Monte Carlo methods. The source term was located in the centre of spherical moderators made of light water, heavy water and polyethylene of different diameters. Also a 239 Pu-Be source was used to measure its neutron spectrum, bare and moderated by water. The neutron spectra were measured at 100 cm with a Bonner spheres spectrometer. Monte Carlo calculations were used to calculate the neutron spectra of bare and water-moderated spectra that were compared with those measured with the spectrometer. Resulting spectra are similar to those found in power plants with PWR, BWR and Candu nuclear reactors. Beside the spectra the dosimetric features were determined. Using moderators and a single neutron source can be produced neutron spectra alike those found in workplaces, this neutron fields can be utilized to calibrate neutron dosimeters and area monitors. (Author)

  20. Schottky spectra and crystalline beams

    International Nuclear Information System (INIS)

    Pestrikov, D.V.

    1996-01-01

    In this paper we revise the current dependence of the Schottky noise power of a cooled proton beam previously measured at NAP-M. More careful study of experimental data indicates a linear decrease in the inverse Schottky noise power with an increase in the beam intensity (N). The root of this function determines a threshold current which occurs at N = N th ≅1.2 x 10 8 particles. The inspection of measured Schottky spectra shows that this threshold does not correspond to some collective instability of the measured harmonic of the linear beam density. The found value of N th does not depend on the longitudinal beam temperature. For the case of NAP-M lattice, the study of the spectral properties of the Schottky noise in the crystalline string predicts the current dependence of the equilibrium momentum spread of the beam, which qualitatively agrees with that, recalculated from the NAP-M data. (orig.)

  1. Fractal analysis of power spectra

    International Nuclear Information System (INIS)

    Johnston, S.

    1982-01-01

    A general argument is presented concerning the Hausdorff dimension D of the power spectrum curve for a system of N weakly-coupled oscillators. Explicit upper and lower bounds for D are derived in terms of the number N of interacting modes. The mathematical reasoning relies upon the celebrated KAM theorem concerning the perturbation of Hamiltonian systems and the finite measure of the set of destroyed tori in phase space; this set can be related to Hausdorff dimension by certain mathematical theorems. An important consequence of these results is a simple empirical test for the applicability of Hamiltonian perturbation theory in the analysis of an experimentally observed spectrum. As an illustration, the theory is applied to the interpretation of a recent numerical analysis of both the power spectrum of the Sun and certain laboratory spectra of hydrodynamic turbulence. (Auth.)

  2. Spectra processing with computer graphics

    International Nuclear Information System (INIS)

    Kruse, H.

    1979-01-01

    A program of processng gamma-ray spectra in rock analysis is described. The peak search was performed by applying a cross-correlation function. The experimental data were approximated by an analytical function represented by the sum of a polynomial and a multiple peak function. The latter is Gaussian, joined with the low-energy side by an exponential. A modified Gauss-Newton algorithm is applied for the purpose of fitting the data to the function. The processing of the values derived from a lunar sample demonstrates the effect of different choices of polynomial orders for approximating the background for various fitting intervals. Observations on applications of interactive graphics are presented. 3 figures, 1 table

  3. Adaptação materna ao transtorno do espectro autismo: relações entre crenças, sentimentos e fatores psicossociais = Maternal adaptation to autism spectrum disorder: relationships between beliefs, feelings and psychosocial factors = Adaptación materna al trastorno del espectro autista: las relaciones entre las creencias, los sentimientos y los factores psicosociales

    Directory of Open Access Journals (Sweden)

    Meimes, Maíra Ainhoren

    2015-01-01

    Full Text Available Crenças e sentimentos relacionados ao desenvolvimento do filho com Transtorno do Espectro Autismo (TEA exercem importante papel na adaptação materna. Entretanto, estes fatores nem sempre são compreendidos com base nos aspectos psicossociais associados. Objetivo: investigar crenças e sentimentos de mães de crianças com TEA relacionando-os a fatores psicossociais, com base no metamodelo biopsicossocial de Bradford. Delineamento: estudo de casos múltiplos, transversal e exploratório. Participantes: quatro mães (idade: 38 a 45 anos de meninos com TEA (idades: 3 anos e 5 meses a 6 anos e 9 meses. Instrumentos: Entrevista de Percepção Materna, Entrevista de Dados Demográficos e Desenvolvimento Infantil e Questionário de Saúde Geral de Goldberg (QSG. Resultados: crenças maternas sobre o desenvolvimento infantil, capacidade para identificar habilidades e seu senso de autoeficácia relacionam-se a diversos fatores psicossociais, como percepção dos recursos intra e extrafamiliares, qualidade dos sistemas de saúde. Discute-se que o impacto do diagnóstico pode ser mediado pelos fatores psicossociais

  4. Factores de riesgo asociados al aislamiento de Escherichia coli o Klebsiella pneumoniae productoras de betalactamasas de espectro extendido en un hospital de cuarto nivel en Colombia

    Directory of Open Access Journals (Sweden)

    Adriana Jiménez

    2014-04-01

    Full Text Available Introducción. Las betalactamasas de espectro extendido (BLEE son un fenómeno de resistencia emergente de particular incidencia en América Latina. En Colombia existe poca información sobre los factores de riesgo asociados con su adquisición. Objetivo. Determinar los factores de riesgo que están asociados a la infección o colonización por Escherichia coli o Klebsiella pneumoniae productoras de BLEE en pacientes mayores de 18 años. Materiales y métodos. Se llevó a cabo un estudio de casos y controles con relación 1:1 en pacientes con aislamientos de E. coli o K. pneumoniae productoras de BLEE en cualquier tipo de muestra durante el periodo de enero de 2009 a noviembre de 2011 en el Hospital Universitario de San José. Resultados. Se estudiaron 110 casos y 110 controles; 62,7 % correspondió a E. coli y 37,3 %, a K. pneumoniae. Como factores de riesgo independiente en el análisis multivariado se encontraron la insuficiencia renal crónica (OR=2,99; IC95%, 1,10-8,11; p=0,031, la cirugía urológica (OR=4,78; IC95%, 1,35-16,87; p=0,015, el antecedente de uso de antibióticos en los tres meses anteriores (OR=2,24; IC95%, 1,09-4,60; p=0,028, el origen hospitalario de la infección (OR=2,92; IC95%, 1,39-6,13; p=0,004 y la hospitalización previa (OR=1,59; IC95%, 1,03-2,46; p=0,036. Conclusión. Anticiparse al patrón de resistencia del microorganismo que infecta a un paciente con base en los factores de riesgo asociados permitiría la elección de un tratamiento antibiótico empírico apropiado, con el fin de lograr la disminución de la morbimortalidad de los pacientes.

  5. Prevalencia y factores de riesgo para infecciones del tracto urinario de inicio en la comunidad causadas por Escherichia coli productor de betalactamasas de espectro extendido en Colombia

    Science.gov (United States)

    Blanco, Victor M.; Maya, Juan J.; Correa, Adriana; Perenguez, Marcela; Muñoz, Juan S.; Motoa, Gabriel; Pallares, Christian J.; Rosso, Fernando; Matta, Lorena; Celis, Yamile; Garzon, Martha; Villegas, y María V.

    2016-01-01

    RESUMEN Introducción Las infecciones del tracto urinario (ITU) son frecuentes en la comunidad. Sin embargo, la información de aislamientos resistentes en este contexto es limitada en Latinoamérica. Este estudio tiene como objetivo determinar la prevalencia y los factores de riesgo asociados con ITU de inicio en la comunidad (ITU-IC) causadas por Escherichia coli productor de betalactamasas de espectro extendido (BLEE) en Colombia. Materiales y métodos Entre agosto y diciembre de 2011 se realizó un estudio de casos y controles en 3 instituciones de salud de tercer nivel en Colombia. Se invitó a participar a todos los pacientes admitidos a urgencias con diagnóstico probable de ITU-IC, y se les pidió una muestra de orina. En los aislamien-tos de E. coli se realizaron pruebas confirmatorias para BLEE, susceptibilidad antibiótica, caracterización molecular (PCR en tiempo real para genes bla, repetitive element palindromic PCR [rep-PCR], multilocus sequence typing [MLST] y factores de virulencia por PCR). Se obtuvo información clínica y epidemiológica, y posteriormente se realizó el análisis estadístico. Resultados De los 2.124 pacientes seleccionados, 629 tuvieron un urocultivo positivo, en 431 de estos se aisló E. coli, 54 fueron positivos para BLEE y 29 correspondieron a CTX-M-15. La mayoría de los aislamientos de E. coli productor de BLEE fueron sensibles a ertapenem, fosfomicina y amikacina. La ITU complicada se asoció fuertemente con infecciones por E. coli productor de BLEE (OR = 3,89; IC 95%: 1,10–13,89; p = 0,03). E. coli productor de CTX-M-15 mostró 10 electroferotipos diferentes; de estos, el 65% correspondieron al ST131. La mayoría de estos aislamientos tuvieron 8 de los 9 factores de virulencia analizados. Discusión E. coli portador del gen blaCTX-M-15 asociado al ST131 sigue siendo frecuente en Colombia. La presencia de ITU-IC complicada aumenta el riesgo de tener E. coli productor de BLEE, lo cual debe tenerse en cuenta para ofrecer

  6. Sistemas de ayuda entre iguales con poblaciones de niños del espectro autista en escuelas inclusivas. Una revisión sistemática

    Directory of Open Access Journals (Sweden)

    Marta Liesa Orús

    2018-01-01

    Full Text Available Como resultado de las políticas de orientación inclusiva, en los últimos años se detecta un creciente interés por que todos los niños aprendan juntos en las escuelas. Concretizando para la población de niños con Trastorno de Espectro Autista, este enfoque ha provocado una desestimación de las intervenciones de carácter más individualizado para dejar surgir a una perspectiva de inclusión escolar, destacando así la importancia de la influencia de los iguales con desarrollo típico (DT en sus habilidades sociales y comunicativas. La utilización pedagógica de los sistemas de ayuda entre iguales implica la enseñanza de una serie de estrategias y pautas a niños sin dificultades para facilitar la interacción social de niños con TEA. De este modo, en esta revisión sistemática se expone el análisis sistemático de 11 trabajos empíricos que utilizan el apoyo y ayuda entre iguales con niños con TEA en situaciones escolares de carácter inclusivo. Tras la extracción de datos se encuentran ciertas diferencias en cuanto al tipo de entrenamiento que reciben los niños con DT y las actividades puestas en práctica con sus compañeros con TEA, en función de la etapa educativa en la que se encuentran y el lugar en que la intervención es puesta en marcha. Para ambas etapas educativas (Infantil y Primaria, el role-playing y el modelado son los dos procedimientos más habitualmente adoptados en el entrenamiento a los iguales que posteriormente van a implementar el sistema de ayudas con sus compañeros con TEA. En el momento de poner en práctica estas intervenciones, el tipo de actividad por excelencia utilizada en la etapa de Infantil, es el juego, mientras que en Primaria se introducen otras actividades más complejas como el refuerzo de intentos comunicativos y la captación de atención.

  7. Determination of the optical absorption spectra of thin layers from their photoacoustic spectra

    Science.gov (United States)

    Bychto, Leszek; Maliński, Mirosław; Patryn, Aleksy; Tivanov, Mikhail; Gremenok, Valery

    2018-05-01

    This paper presents a new method for computations of the optical absorption coefficient spectra from the normalized photoacoustic amplitude spectra of thin semiconductor samples deposited on the optically transparent and thermally thick substrates. This method was tested on CuIn(Te0.7Se0.3)2 thin films. From the normalized photoacoustic amplitude spectra, the optical absorption coefficient spectra were computed with the new formula as also with the numerical iterative method. From these spectra, the value of the energy gap of the thin film material and the type of the optical transitions were determined. From the experimental optical transmission spectra, the optical absorption coefficient spectra were computed too, and compared with the optical absorption coefficient spectra obtained from photoacoustic spectra.

  8. ERX: a software for editing files containing X-ray spectra to be used in exposure computational models

    International Nuclear Information System (INIS)

    Cabral, Manuela O.M.; Vieira, Jose W.; Silva, Alysson G.; Leal Neto, Viriato; Oliveira, Alex C.H.; Lima, Fernando R.A.

    2011-01-01

    Exposure Computational Models (ECMs) are utilities that simulate situations in which occurs irradiation in a given environment. An ECM is composed primarily by an anthropomorphic model (phantom), and a Monte Carlo code (MC). This paper presents a tutorial of the software Espectro de Raios-X (ERX). This software performs reading and numerical and graphical analysis of text files containing diagnostic X-ray spectra for use in algorithms of radioactive sources in the ECMs of a Grupo de Dosimetria Numerica. The ERX allows the user to select one among several X-ray spectrums in the energy range Diagnostic radiology X-Ray most commonly used in radiology clinics. In the current version of the ERX there are two types of input files: the contained in mspectra.dat file and the resulting of MC simulations in Geant4. The software allows the construction of charts of the Probability Density Function (PDF) and Cumulative Distribution Function (CDF) of a selected spectrum as well as the table with the values of these functions and the spectrum. In addition, the ERX allows the user to make comparative analysis between the PDF graphics of the two catalogs of spectra available, besides being can perform dosimetric evaluations with the selected spectrum. A software of this kind is an important computational tool for researchers in numerical dosimetry because of the diversity of Diagnostic radiology X-Ray machines, which implies in a mass of input data highly diverse. And because of this, the ERX provides independence to the group related to the data origin that is contained in the catalogs created, not being necessary to resort to others. (author)

  9. Structure of high-resolution NMR spectra

    CERN Document Server

    Corio, PL

    2012-01-01

    Structure of High-Resolution NMR Spectra provides the principles, theories, and mathematical and physical concepts of high-resolution nuclear magnetic resonance spectra.The book presents the elementary theory of magnetic resonance; the quantum mechanical theory of angular momentum; the general theory of steady state spectra; and multiple quantum transitions, double resonance and spin echo experiments.Physicists, chemists, and researchers will find the book a valuable reference text.

  10. Reflectance spectra of subarctic lichens

    International Nuclear Information System (INIS)

    Petzold, D.E.; Goward, S.N.

    1988-01-01

    Lichens constitute a major portion of the ground cover of high latitude environments, but little has been reported concerning their in situ solar spectral reflectance properties. Knowledge of these properties is important for the interpretation of remotely sensed observations from high latitude regions, as well as in studies of high latitude ecology and energy balance climatology. The spectral reflectance of common boreal vascular plants is similar to that of vascular plants of the mid latitudes. The dominant lichens, in contrast, display variable reflectance patterns in visible wavelengths. The relative reflectance peak at 0.55 μm, common to green vegetation, is absent or indistinct in spectra of pervasive boreal forest and tundra lichens, despite the presence of chlorophyll in the inner algal cells. Lichens of the dominant genus, Cladina, display strong absorption of ultraviolet energy and short-wavelength blue light relative to their absorption in other visible wavelengths. Since the Cladinae dominate both the surface vegetation in open woodlands of the boreal forest and the low arctic tundra, their unusual spectral reflectance patterns will enable accurate monitoring of the boreal forest-tundra ecotone and detection of its vigor and movement in the future. (author)

  11. Energy spectra of quantum rings.

    Science.gov (United States)

    Fuhrer, A; Lüscher, S; Ihn, T; Heinzel, T; Ensslin, K; Wegscheider, W; Bichler, M

    2001-10-25

    Quantum mechanical experiments in ring geometries have long fascinated physicists. Open rings connected to leads, for example, allow the observation of the Aharonov-Bohm effect, one of the best examples of quantum mechanical phase coherence. The phase coherence of electrons travelling through a quantum dot embedded in one arm of an open ring has also been demonstrated. The energy spectra of closed rings have only recently been studied by optical spectroscopy. The prediction that they allow persistent current has been explored in various experiments. Here we report magnetotransport experiments on closed rings in the Coulomb blockade regime. Our experiments show that a microscopic understanding of energy levels, so far limited to few-electron quantum dots, can be extended to a many-electron system. A semiclassical interpretation of our results indicates that electron motion in the rings is governed by regular rather than chaotic motion, an unexplored regime in many-electron quantum dots. This opens a way to experiments where even more complex structures can be investigated at a quantum mechanical level.

  12. Reflectance spectra of subarctic lichens

    Science.gov (United States)

    Petzold, Donald E.; Goward, Samuel N.

    1988-01-01

    Lichens constitute a major portion of the ground cover of high latitude environments, but little has been reported concerning their in situ solar spectral reflectance properties. Knowledge of these properties is important for the interpretation of remotely sensed observations from high latitude regions, as well as in studies of high latitude ecology and energy balance climatology. The spectral reflectance of common boreal vascular plants is similar to that of vascular plants of the midlatitudes. The dominant lichens, in contrast, display variable reflectance patterns in visible wavelengths. The relative reflectance peak at 0.55 microns, common to green vegetation, is absent or indistinct in spectra of pervasive boreal forest and tundra lichens, despite the presence of chlorophyll in the inner algal cells. Lichens of the dominant genus, Cladina, display strong absorption of ultraviolet energy and short-wavelength blue light relative to their absorption in other visible wavelengths. Since the Cladinae dominate both the surface vegetation in open woodlands of the boreal forest and the low arctic tundra, their unusual spectral reflectance patterns will enable accurate monitoring of the boreal forest-tundra ecotone and detection of its vigor and movement in the future.

  13. Ultraviolet spectra of planetary nebulae

    International Nuclear Information System (INIS)

    Harrington, J.P.; Seaton, M.J.; Adams, S.; Lutz, J.H.

    1982-01-01

    A detailed study of NGC 7662 is based on UV results obtained from 15 IUE spectra and on observations of other workers at optical, IR and radio wavelengths. Improved techniques are used to extract IUE data for an extended source. Relative fluxes in the different apertures which have been used are obtained using the brightness contours of Coleman, Reay and Worswick. There is close agreement between the reddening deduced from the ratios He II (lambda 1640)/(lambda 4686) and (radio)/(Hβ) and the nebular continuum emission observed with the IUE large slots agrees closely with that predicted using absolute radio and Hβ fluxes. The fluxes in nebular emission lines observed with the small slots are smaller than expected from brightness distributions; it is concluded that, for an extended source, the small slots have aperture transmission factors of 0.85 for SWP and 0.46 for LWR. The central star is fainter than has been previously supposed (by more than two magnitudes). The blackbody He II Zanstra temperature of 113 000 K is consistent with the UV colour temperature. Previous work on colour temperatures of central stars is discussed critically. Two models are discussed. (author)

  14. Methodology for analyzing weak spectra

    International Nuclear Information System (INIS)

    Yankovich, T.L.; Swainson, I.P.

    2000-02-01

    There is considerable interest in quantifying radionuclide transfer between environmental compartments. However, in many cases, it can be a challenge to detect concentrations of gamma-emitting radionuclides due to their low levels in environmental samples. As a result, it is valuable to develop analytical protocols to ensure consistent analysis of the areas under weak peaks. The current study has focused on testing how reproducibly peak areas and baselines can be determined using two analytical approaches. The first approach, which can be carried out using Maestro software, involves extracting net counts under a curve without fitting a functional form to the peak, whereas the second approach, which is used by most other peak fitting programs, determines net counts from spectra by fitting a Gaussian form to the data. It was found that the second approach produces more consistent peak area and baseline measurements, with the ability to de-convolute multiple, overlapping peaks. In addition, programs, such as Peak Fit, which can be used to fit a form to spectral data, often provide goodness of fit analyses, since the Gaussian form can be described using a characteristic equation against which peak data can be tested for their statistical significance. (author)

  15. Neutron and photon spectra in LINACs

    International Nuclear Information System (INIS)

    Vega-Carrillo, H.R.; Martínez-Ovalle, S.A.; Lallena, A.M.; Mercado, G.A.; Benites-Rengifo, J.L.

    2012-01-01

    A Monte Carlo calculation, using the MCNPX code, was carried out in order to estimate the photon and neutron spectra in two locations of two linacs operating at 15 and 18 MV. Detailed models of both linac heads were used in the calculations. Spectra were estimated below the flattening filter and at the isocenter. Neutron spectra show two components due to evaporation and knock-on neutrons. Lethargy spectra under the filter were compared to the spectra calculated from the function quoted by Tosi et al. that describes reasonably well neutron spectra beyond 1 MeV, though tends to underestimate the energy region between 10 –6 and 1 MeV. Neutron and the Bremsstrahlung spectra show the same features regardless of the linac voltage. - Highlights: ► With MCNPX code realistic models of two LINACs were built. ► Photon and neutron spectra below the flattening filter and at the isocenter were calculated. ► Neutron spectrum at the flattening filter was compared against the Tosi et al. source-term model. ► Tosi et al. model underestimates the neutron contribution below 1 MeV. ► Photon spectra look alike to those published in literature.

  16. Optical absorption spectra of Ag-11 isomers

    DEFF Research Database (Denmark)

    Martinez, Jose Ignacio; Fernandez, E. M.

    2009-01-01

    The optical absorption spectra of the three most; stable structural isomers of the Ag-11 cluster were calculated using the time-dependent, density functional theory within the Casida formalism. The slightly different, spectra, of the isomers may permit the identification of the ground-stale confi......The optical absorption spectra of the three most; stable structural isomers of the Ag-11 cluster were calculated using the time-dependent, density functional theory within the Casida formalism. The slightly different, spectra, of the isomers may permit the identification of the ground...

  17. TEA, Trastorno del Espectro Autista :

    OpenAIRE

    Vegas Martín, Irene

    2015-01-01

    La autora expone los aspectos fundamentales sobre el concepto del TEA para posteriormente mostrarnos un caso práctico y su tratamiento durante unos meses con la finalidad que sea un trabajo de consulta práctico

  18. Fluctuation analysis of rotational spectra

    International Nuclear Information System (INIS)

    Doessing, T.; Bracco, A.; Broglia, R.A.; Matsuo, M.

    1996-01-01

    The compound state rotational degree of freedom is ''damped'' in the sense that the electric quadrupole decay of a single quantum state with angular momentum I exhibits a spectrum of final states all having spin I-2. In actual experiments, the cascade of γ-rays associated with each of the members of the ensemble of compound nuclei uses each of the ''discrete'' transitions many more times than the ''continuum'' transitions. Relatively large and small fluctuations in the recorded coincidence spectrum ensue, respectively. The analysis of the fluctuations will be shown to be instrumental to gain insight into the phenomenon of rotational damping. For this purpose, two- and higher-fold coincidence spectra emitted from rotating nuclei are analyzed with respect to the count fluctuations. The coincidences from consecutive γ-rays emitted from discrete rotational bands generate ridges in the E γ1 .E γ2 spectrum, and the fluctuation analysis of the ridges is based upon the ansatz of a random selection of transition energies from band to band. This ansatz is supported by a cranked mean-field calculation for the nucleus 168 Yb, as well as by analyzing resolved bands in 168 Yb and its neighbors. The fluctuation analysis of the central valley (E γ1 =E γ2 ) is based upon the ansatz of fluctuations in the intensity of the transitions of Porter-Thomas type superposed on a smooth spectrum of transition energies. This ansatz is again supported by a mixed-band calculation. The mathematical treatment of count fluctuations is formulated in general (orig.)

  19. Area spectra of near extremal black holes

    International Nuclear Information System (INIS)

    Chen, Deyou; Yang, Haitang; Zu, Xiaotao

    2010-01-01

    Motivated by Maggiore's new interpretation of quasinormal modes, we investigate area spectra of a near extremal Schwarzschild-de Sitter black hole and a higher-dimensional near extremal Reissner-Nordstrom-de Sitter black hole. The result shows that the area spectra are equally spaced and irrelevant to the parameters of the black holes. (orig.)

  20. Composite Spectra Paper 1: HR 6902

    Indian Academy of Sciences (India)

    tribpo

    spectra; in many cases we have used the maximum width permitted by the optics of ... 10 mЕ, corresponding to 1 µm the plate, are the norm. ..... an inequality ..... on the spectra of HR 6902, we have thought it appropriate to weight the four ...

  1. Thermoluminescence spectra measured with a Michelson interferometer

    International Nuclear Information System (INIS)

    Haschberger, P.

    1991-01-01

    A Michelson interferometer was redesigned to prove its capabilities in the measurement of short-lived, low-intensity thermoluminescence spectra. Interferograms are collected during heating up the thermoluminescent probe in a heater plate. A personal computer controls the data acquisition and processes the Fourier transform. As the results show, even a comparatively simple and limited setup leads to relevant and reproducible spectra. (author)

  2. Near IR spectra of symbiotic stars

    International Nuclear Information System (INIS)

    Andrillat, Y.

    1982-01-01

    The author reports on recent observations from the near IR spectra of symbiotic stars. The helium and oxygen lines useful for the construction of theoretical models are identified. Observations for cool stars and novae (nebular phase) are outlined and the spectra of specific symbiotic stars between lambdalambda 8000-11000 are presented and discussed. (Auth./C.F.)

  3. Aircraft Measurements of Atmospheric Kinetic Energy Spectra

    DEFF Research Database (Denmark)

    Lundtang Petersen, Erik; Lilly, D. K.

    1983-01-01

    Wind velocity data obtained from a jet airliner are used to construct kinetic energy spectra over the range of wavelengths from 2.5 to 2500 km. The spectra exhibit an approximate -5/3 slope for wavelengths of less than about 150 km, steepening to about -2.2 at larger scales. These results support...

  4. PCA: Principal Component Analysis for spectra modeling

    Science.gov (United States)

    Hurley, Peter D.; Oliver, Seb; Farrah, Duncan; Wang, Lingyu; Efstathiou, Andreas

    2012-07-01

    The mid-infrared spectra of ultraluminous infrared galaxies (ULIRGs) contain a variety of spectral features that can be used as diagnostics to characterize the spectra. However, such diagnostics are biased by our prior prejudices on the origin of the features. Moreover, by using only part of the spectrum they do not utilize the full information content of the spectra. Blind statistical techniques such as principal component analysis (PCA) consider the whole spectrum, find correlated features and separate them out into distinct components. This code, written in IDL, classifies principal components of IRS spectra to define a new classification scheme using 5D Gaussian mixtures modelling. The five PCs and average spectra for the four classifications to classify objects are made available with the code.

  5. General Notes on Processes and Their Spectra

    Directory of Open Access Journals (Sweden)

    Gustav Cepciansky

    2012-01-01

    Full Text Available The frequency spectrum performs one of the main characteristics of a process. The aim of the paper is to show the coherence between the process and its own spectrum and how the behaviour and properties of a process itself can be deduced from its spectrum. Processes are categorized and general principles of their spectra calculation and recognition are given. The main stress is put on power spectra of electric and optic signals, as they also perform a kind of processes. These spectra can be directly measured, observed and examined by means of spectral analyzers and they are very important characteristics which can not be omitted at transmission techniques in telecommunication technologies. Further, the paper also deals with non electric processes, mainly with processes and spectra at mass servicing and how these spectra can be utilised in praxis.

  6. Design spectra development considering short time histories

    International Nuclear Information System (INIS)

    Weiner, E.O.

    1983-01-01

    Two separate programs, MODQKE and MDOF, were written to provide a capability of obtaining equipment spectra from design spectra. MODQKE generates or modifies acceleration histories to conform with design spectra pertaining to, say, a foundation. MDOF is a simple linear modal superposition program that solves for equipment support histories using the design spectra conforming histories as input. Equipment spectra, then, are obtained from the support histories using MODQKE. MODQKE was written to modify or provide new histories with special attention paid to short seismic records. A technique from the open literature was borrowed to generate an initial history that approximates a given response spectrum. Further refinement is done with smoothing cycles in which several correction signals are added to the history in a way that produces a least squares fit between actual and prescribed spectra. Provision is made for history shaping, a baseline correction, and final scaling. MODQKE performance has been demonstrated with seven examples having zero to ten percent damping ratios, and 2.5 seconds to 20 seconds durations and a variety of target spectra. The examples show the program is inexpensive to use. MDOF is a simple modal superposition program. It has no eigensolver, and the user supplies mode shapes, frequencies, and participation factors as input. Floor spectra can be generated from design spectra by using a history from MODQKE that conforms to the design spectrum as input to MDOF. Floor motions from MDOF can be fed back to MODQKE without modification to obtain the floor spectra. A simple example is given to show how equipment mass effects can be incorporated into the MDOF solution. Any transient solution capability can be used to replace MDOF. For example, a direct transient approach may be desirable if both the equipment and floor structures are to be included in the model with different damping fractions. (orig./HP)

  7. Espectro óculo-aurículo-vertebral e malformações cardíacas Oculo-auriculo-vertebral spectrum and cardiac malformations

    Directory of Open Access Journals (Sweden)

    Rafael Fabiano Machado Rosa

    2010-01-01

    Full Text Available OBJETIVO: Verificar a frequência e tipos de cardiopatias congênitas em uma amostra de pacientes portadores de espectro óculo-aurículo-vertebral (EOAV, tentando correlacionar a presença desta malformação com suas demais características clínicas e evolução. MÉTODOS: A amostra foi composta por 33 indivíduos, todos atendidos em um mesmo centro, no período de janeiro de 1975 a dezembro de 2007. Vinte e dois deles eram do sexo masculino e 11 do feminino e suas idades variaram de 1 dia a 17 anos. Todos apresentavam avaliação cariotípica normal por bandas GTG. Realizou-se uma coleta de dados referentes à sua história clínica, exame físico e resultado de avaliações complementares. RESULTADOS: Anormalidades cardíacas foram observadas em 13 pacientes (39,4%. Dessas, cinco (38,5% eram do tipo conotruncal, sendo o principal defeito a tetralogia de Fallot (n=2. Malformações não usuais identificadas incluíram o cor triatriatum e a dupla via de entrada de ventrículo esquerdo. Diferenças significativas entre as características clínicas do grupo com e sem cardiopatia foram verificadas somente em relação à idade na primeira avaliação, que foi mais baixa naqueles com malformações cardíacas. Cinco indivíduos foram a óbito, quatro deles portadores desses defeitos. CONCLUSÃO: Malformações cardíacas, em especial dos tipos conotruncal e septal, são frequentes entre pacientes com EOAV. A frequência encontrada em nosso estudo foi estatisticamente similar à da maior parte dos trabalhos descritos na literatura, que oscila de 18% a 58%. As cardiopatias congênitas também representam a principal causa de óbito desses indivíduos. Portanto, uma avaliação cardiológica, especialmente precoce, deveria ser sempre realizada nesses pacientes.OBJECTIVE: To verify the frequency and types of congenital heart defects in a sample of patients with oculo-auriculo-vertebral spectrum (OAVS, in an effort to correlate presence of these

  8. Software para enseñar emociones al alumnado con trastorno del espectro autista Software for Teaching Emotions to Students with Autism Spectrum Disorder

    Directory of Open Access Journals (Sweden)

    Josefina Lozano Martínez

    2011-03-01

    Full Text Available En este artículo se presentan los resultados de una investigación en la que se ha utilizado un software educativo para apoyar el proceso de enseñanza y aprendizaje de competencias emocionales y sociales en alumnado con trastornos del espectro autista (TEA escolarizado en educación primaria y secundaria. Los participantes, con dificultades en el reconocimiento de estados emocionales, han sido nueve alumnos de edades comprendidas entre los 8 y 18 años, de ambos sexos y con un rango de índice de edad mental entre 5 y 7 años de edad. Para ello, se utilizó un diseño de grupo único con pretest-postest. Así, antes del proceso de enseñanza, el alumnado fue evaluado con relación a sus niveles de competencia emocional y social, con la finalidad de establecer, también, el nivel de inicio del proceso de enseñanza para cada uno de ellos. El proceso de enseñanza se desarrolló a lo largo de dos sesiones semanales de 45 minutos, cada una, en un intervalo de dos cursos académicos (2006/08. Tras el proceso de intervención educativa, los alumnos fueron nuevamente evaluados. Los resultados obtenidos confirman que la utilización del software educativo en la enseñanza de competencias emocionales y sociales ayuda a los alumnos a mejorar su capacidad para superar tareas encaminadas a la comprensión de competencias emocionales. Además, los participantes mejoraron sus competencias sociales ya que docentes y familiares apreciaron progresos significativos en esta área.This paper reports the results of a research project in which educational software was used to teach social and emotional skills to primary and secondary school students with autism spectrum disorders (ASD. The participants with difficulties in recognizing emotional states were nine male and female students aged between 8 and 18, with a mental age range of between 5 and 7 years. A single group design with pre-test/post-test was used. The students were assessed before teaching in

  9. Spectra of conformal sigma models

    International Nuclear Information System (INIS)

    Tlapak, Vaclav

    2015-04-01

    In this thesis the spectra of conformal sigma models defined on (generalized) symmetric spaces are analysed. The spaces where sigma models are conformal without the addition of a Wess-Zumino term are supermanifolds, in other words spaces that include fermionic directions. After a brief review of the general construction of vertex operators and the background field expansion, we compute the diagonal terms of the one-loop anomalous dimensions of sigma models on semi-symmetric spaces. We find that the results are formally identical to the symmetric case. However, unlike for sigma models on symmetric spaces, off diagonal terms that lead to operator mixing are also present. These are not computed here. We then present a detailed analysis of the one-loop spectrum of the supersphere S 3 vertical stroke 2 sigma model as one of the simplest examples. The analysis illustrates the power and simplicity of the construction. We use this data to revisit a duality with the OSP(4 vertical stroke 2) Gross-Neveu model that was proposed by Candu and Saleur. With the help of a recent all-loop result for the anomalous dimension of (1)/(2)BPS operators of Gross-Neveu models, we are able to recover the entire zero-mode spectrum of the supersphere model. We also argue that the sigma model constraints and its equations of motion are implemented correctly in the Gross-Neveu model, including the one-loop data. The duality is further supported by a new all-loop result for the anomalous dimension of the ground states of the sigma model. However, higher-gradient operators cannot be completely recovered. It is possible that this discrepancy is related to a known instability of the sigma model. The instability of sigma models is due to symmetry preserving high-gradient operators that become relevant at arbitrarily small values of the coupling. This feature has been observed long ago in one-loop calculations of the O(N)-vector model and soon been realized to be a generic property of sigma models

  10. Statistical properties of Fermi GBM GRBs' spectra

    Science.gov (United States)

    Rácz, István I.; Balázs, Lajos G.; Horvath, Istvan; Tóth, L. Viktor; Bagoly, Zsolt

    2018-03-01

    Statistical studies of gamma-ray burst (GRB) spectra may result in important information on the physics of GRBs. The Fermi GBM catalogue contains GRB parameters (peak energy, spectral indices, and intensity) estimated fitting the gamma-ray spectral energy distribution of the total emission (fluence, flnc), and during the time of the peak flux (pflx). Using contingency tables, we studied the relationship of the models best-fitting pflx and flnc time intervals. Our analysis revealed an ordering of the spectra into a power law - Comptonized - smoothly broken power law - Band series. This result was further supported by a correspondence analysis of the pflx and flnc spectra categorical variables. We performed a linear discriminant analysis (LDA) to find a relationship between categorical (spectral) and model independent physical data. LDA resulted in highly significant physical differences among the spectral types, that is more pronounced in the case of the pflx spectra, than for the flnc spectra. We interpreted this difference as caused by the temporal variation of the spectrum during the outburst. This spectral variability is confirmed by the differences in the low-energy spectral index and peak energy, between the pflx and flnc spectra. We found that the synchrotron radiation is significant in GBM spectra. The mean low-energy spectral index is close to the canonical value of α = -2/3 during the peak flux. However, α is ˜ -0.9 for the spectra of the fluences. We interpret this difference as showing that the effect of cooling is important only for the fluence spectra.

  11. Desarrollo de la capacidad de memoria semántica a través de la formación de redes relacionadas en estudiantes con trastorno del espectro autista

    Directory of Open Access Journals (Sweden)

    Manuel Ojea Rúa

    2017-07-01

    Full Text Available Este estudio presenta el análisis de la efectividad de un programa, cuya finalidad es facilitar el desarrollo de la memoria semántica y sus relaciones en estudiantes con trastorno del espectro autista, diseñado bajo los principios teóricos de la teoría de la percepción y la teoría de la coherencia central cognitiva. Para llevarlo a cabo, se ha utilizado un diseño experimental pretests-programa-postests de dos grupos, uno experimental y otro de control, en el cual han participado 14 estudiantes de 13 años de edad, distribuidos equitativamente entre ambos grupos. Los resultados muestran que el programa responde positivamente a los objetivos de la investigación, ya que los estudiantes que integran el grupo experimental han mejorado significativamente en relación con sus pares del grupo control.

  12. Scaling properties of the transverse mass spectra

    International Nuclear Information System (INIS)

    Schaffner-Bielich, J.

    2002-01-01

    Motivated from the formation of an initial state of gluon-saturated matter, we discuss scaling relations for the transverse mass spectra at BNL's relativistic heavy-ion collider (RHIC). We show on linear plots, that the transverse mass spectra for various hadrons can be described by an universal function in m t . The transverse mass spectra for different centralities can be rescaled into each other. Finally, we demonstrate that m t -scaling is also present in proton-antiproton collider data and compare it to m t -scaling at RHIC. (orig.)

  13. IRAS low-resolution spectra of galaxies

    International Nuclear Information System (INIS)

    Cohen, M.; Volk, K.

    1989-01-01

    The spectra of external galaxies are selected and extracted from the IRAS LRS database. Twenty-one objects present viable spectra. One is a peculiar star-forming E-S0 galaxy. The remainder are all starburst or H II region galaxies. Their average spectrum demonstrates the importance of the PAH emission bands in the 8-23-micron region and reinforces the conclusion reached from ground-based spectra, that there is a strong correlation between the PAH bands and the starburst or H II region character of a galaxy. 32 refs

  14. Parametrization relating the fermionic mass spectra

    International Nuclear Information System (INIS)

    Kleppe, A.

    1993-01-01

    When parametrizing the fermionic mass spectra in terms of the unit matrix and a recursive matrix scrR 0 , which corresponds to an underlying scaling pattern in the mass spectra, each fermionic sector is characterized by three parameters: k, α, and R. Using the set of relations displayed by the parameters of the different sectors, it is possible to formulate a ''family Lagrangian'' which for each sector encompasses all the families. Relations between quark masses are furthermore deduced from these ''family Lagrangians.'' Using the relations between the parameters of the different charge sectors, it is also possible to ''derive'' the quark mass spectra from the (charged) leptonic mass spectrum

  15. Efecto de la curvatura espacial del universo en el espectro angular de las anisotropías en la temperatura de la radiación cósmica de fondo

    Directory of Open Access Journals (Sweden)

    Gabriel A. Mariño

    2007-01-01

    Full Text Available El paradigma inflacionario resuelve los tres problemas clásicos de la cosmología estándar: el problema de planitud, el problema de hori- zonte y el problema de las reliquias no deseadas. En particular, el problema de planitud se resuelve al explicar cómo la contribución relativa de la cur- vatura espacial del Universo a2K 2 a la densidad total de energía decrece H exponencialmente durante la inflación. Además, el escenario inflacionario nos ofrece un mecanismo eficiente para generar pequeñas perturbaciones en la curvatura espacial que explicarían las anisotropías en la temperatura de la radiación cósmica de fondo (RCF observadas hoy en día. Los tradi- cionales modelos inflacionarios que desprecian la contribución relativa a2K 2 H reproducen las recientes observaciones del satélite WMAP sobre el espectro angular Cl de las anisotropías en la temperatura de la RCF, pero fallan en los multipolos más pequeños, en donde las observaciones presentan una inesperada caída. Este extraño comportamiento nos conduce a proponer un análisis del espectro angular Cl a grandes escalas (pequeños multipolos teniendo en cuenta la contribución relativa a2K 2 , y ofrecer un mejor ajuste H a los datos experimentales, evidenciando así la topología característica del Universo observado.

  16. Da cor à cor inexistente: uma reflexão sobre espectros eletrônicos e efeitos cromáticos

    Directory of Open Access Journals (Sweden)

    Toma Henrique E.

    2005-01-01

    Full Text Available Inexistent colors have been the inspiring theme of investigation by Israel Pedrosa, a Brazilian artist, who has devoted his life to creative painting, exploiting the chemical and physical effects associated with light, especially those generated in the light refraction domain. In this article, by focusing on the electronic spectra of phthalocyanines and gold nanoparticles, we discuss how such effects can influence the spectroscopic measurements, leading to inexistent bands and transitions.

  17. Power spectra of currents off Bombay

    Digital Repository Service at National Institute of Oceanography (India)

    Varkey, M.J.

    Current measurements were carried out using a recording current meter across the continental shelf off Bombay, Maharashtra, India at 4 stations from an anchored ship. Power spectra were computed for selected lengths of records. Spectral energy...

  18. Contribution to the study of turbulence spectra

    Science.gov (United States)

    Dumas, R.

    1979-01-01

    An apparatus suitable for turbulence measurement between ranges of 1 to 5000 cps and from 6 to 16,000 cps was developed and is described. Turbulence spectra downstream of the grills were examined with reference to their general characteristics, their LF qualities, and the effects of periodic turbulence. Medium and HF are discussed. Turbulence spectra in the boundary layers are similarly examined, with reference to their fluctuations at right angles to the wall, and to lateral fluctuations. Turbulence spectra in a boundary layer with suction to the wall is discussed. Induced turbulence, and turbulence spectra at high Reynolds numbers. Calculations are presented relating to the effect of filtering on the value of the correlations in time and space.

  19. Experimental phase diagram for random laser spectra

    International Nuclear Information System (INIS)

    El-Dardiry, Ramy G S; Mooiweer, Ronald; Lagendijk, Ad

    2012-01-01

    We systematically study the presence of narrow spectral features in a wide variety of random laser samples. Less gain or stronger scattering are shown to lead to a crossover from spiky to smooth spectra. A decomposition of random laser spectra into a set of Lorentzians provides unprecedented detail in the analysis of random laser spectra. We suggest an interpretation in terms of mode competition that enables an understanding of the observed experimental trends. In this interpretation, smooth random laser spectra are a consequence of competing modes for which the loss and gain are proportional. Spectral spikes are associated with modes that are uncoupled from the mode competition in the bulk of the sample. (paper)

  20. On two-spectra inverse problems

    OpenAIRE

    Guliyev, Namig J.

    2018-01-01

    We consider a two-spectra inverse problem for the one-dimensional Schr\\"{o}dinger equation with boundary conditions containing rational Herglotz--Nevanlinna functions of the eigenvalue parameter and provide a complete solution of this problem.

  1. Angular Spectra of Polarized Galactic Foregrounds

    OpenAIRE

    Cho, Jung; Lazarian, A.

    2003-01-01

    It is believed that magnetic field lines are twisted and bend by turbulent motions in the Galaxy. Therefore, both Galactic synchrotron emission and thermal emission from dust reflects statistics of Galactic turbulence. Our simple model of Galactic turbulence, motivated by results of our simulations, predicts that Galactic disk and halo exhibit different angular power spectra. We show that observed angular spectra of synchrotron emission are compatible with our model. We also show that our mod...

  2. Generation of synthetic gamma spectra with MATLAB

    International Nuclear Information System (INIS)

    Palmerio, Julian J.; Coppo, Anibal D.

    2009-01-01

    Objectives: The aim of this work is the simulation of gamma spectra using the MATLAB program to generate the calibration curves in efficiency, which will be used to measure radioactive waste in drums. They are necessary for the proper characterization of these drums. A Monte Carlo simulation was basically developed with the random number generator Mersenne Twister and nuclear data obtained from NIST. This paper shows the results obtained and difficulties encountered until today. The physical correction of the simulated spectra has been the only aspect we have been working, up to this moment. Procedures: A simplified representation of the 'Laboratorio de Verificacion y Control de la Calidad' was chosen. Drums with cemented liquid waste are routinely measured in this laboratory. The commercial program MCNP was also used to get a valid reference in the field of simulation of spectra. We analyzed the spectra obtained by MATLAB in the light of classical literature photon detection and the spectrum obtained by MCNP. Conclusions: Currently the program developed seems adequate to simulate a measurement in the 'Laboratorio de Verificacion y Control de la Calidad'. The spectra obtained by MATLAB seem to physically represent what is observed in real spectra. However, it is a slow program. The current development efforts are directed to improve the speed of simulation. An alternative is to use the CUDA language for NVIDIA video cards to parallelized the simulation. An adequate simulation of the electronic measuring chain is also needed to obtain better representations of the shapes of the peaks. (author)

  3. Identifying Broadband Rotational Spectra with Neural Networks

    Science.gov (United States)

    Zaleski, Daniel P.; Prozument, Kirill

    2017-06-01

    A typical broadband rotational spectrum may contain several thousand observable transitions, spanning many species. Identifying the individual spectra, particularly when the dynamic range reaches 1,000:1 or even 10,000:1, can be challenging. One approach is to apply automated fitting routines. In this approach, combinations of 3 transitions can be created to form a "triple", which allows fitting of the A, B, and C rotational constants in a Watson-type Hamiltonian. On a standard desktop computer, with a target molecule of interest, a typical AUTOFIT routine takes 2-12 hours depending on the spectral density. A new approach is to utilize machine learning to train a computer to recognize the patterns (frequency spacing and relative intensities) inherit in rotational spectra and to identify the individual spectra in a raw broadband rotational spectrum. Here, recurrent neural networks have been trained to identify different types of rotational spectra and classify them accordingly. Furthermore, early results in applying convolutional neural networks for spectral object recognition in broadband rotational spectra appear promising. Perez et al. "Broadband Fourier transform rotational spectroscopy for structure determination: The water heptamer." Chem. Phys. Lett., 2013, 571, 1-15. Seifert et al. "AUTOFIT, an Automated Fitting Tool for Broadband Rotational Spectra, and Applications to 1-Hexanal." J. Mol. Spectrosc., 2015, 312, 13-21. Bishop. "Neural networks for pattern recognition." Oxford university press, 1995.

  4. X-Rays spectrum and air kerma during a mammography study;Espectro de los rayos X y kerma en aire durante un estudio mamografico

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez G, J. [Instituto Nacional de Estadistica Geografia e Informatica, Direccion General de Innovacion y Tecnologia de Informacion, Av. Heroes de Nacozari Sur No. 2301, Fracc. Jardines del Parque, 20276 Aguascalientes (Mexico); Hernandez V, R.; Chacon R, A.; Vega C, H. R., E-mail: ramirezgonzalezjaime@yahoo.com.m [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2009-10-15

    The X-rays spectrum produced in a mammography has been calculated by means of Monte Carlo methods. In this calculation series it is modeled the electrons source, the target and the filter. The spectra were calculated for an energy of the electrons of 28 keV and for targets of W, Mo and Rh. The calculations extended to analyze the effect that produces the filters inclusion in the spectra; the spectra of W-A1, Rh-Rh, Mo-Mo, Mo-Rh and Mo-Be were calculated this way. Using thermoluminescent dosemeters of ZrO{sub 2}+PTFE the air kerma was measured in five points located on a phantom made with acrylic and water when it is was exposed to a X-rays beam produced by electrons of 24 keV and 10 m A of current that it produces a mammography. The values of the air kerma on the entrance surface of the phantom were compared with the calculated values by means of Monte Carlo methods. The calculated spectra present a continuous component and another discreet and its form is similar to the reported spectra in the literature. The filters inclusion allows the elimination of the low energy photons that do not have utility in the obtaining of the mammography image and only they contribute to deposit a dose in the mamma. The values of the measured air kerma indicate that the five points receive the same air kerma approximately, what means that the beam is homogeneous, of the Monte Carlo calculations we find that the center receives a bigger dose which implies that the beam is not uniform, the explanation on this fact it is attributed to that a simple model was used in the calculations, nevertheless, the average of the air kerma measured on the entrance surface of the phantom was of 0.96 +- 0.03 m G, while the obtained by means of the calculations was of 0.96 +- 0.06 mGy, when comparing both significant differences do not exist. (Author)

  5. Good abundances from bad spectra - I. Techniques

    Science.gov (United States)

    Jones, J. Bryn; Gilmore, Gerard; Wyse, Rosemary F. G.

    1996-01-01

    Stellar spectra derived from multiple-object fibre-fed spectroscopic radial-velocity surveys, of the type feasible with, among other examples, AUTOFIB, 2dF, HYDRA, NESSIE, and the Sloan survey, differ significantly from those traditionally used for determination of stellar abundances. The spectra tend to be of moderate resolution (around 1A) and signal-to-noise ratio (around 10-20 per resolution element), and cannot usually have reliable continuum shapes determined over wavelength ranges in excess of a few tens of Angstroms. None the less, with care and a calibration of stellar effective temperature from photometry, independent of the spectroscopy, reliable iron abundances can be derived. We have developed techniques to extract true iron abundances and surface gravities from low-signal-to-noise ratio, intermediate-resolution spectra of G-type stars in the 4000-5000A wavelength region. Spectroscopic indices sensitive to iron abundance and gravity are defined from a set of narrow (few-several A wide) wavelength intervals. The indices are calibrated theoretically using synthetic spectra. Given adequate data and a photometrically determined effective temperature, one can derive estimates of the stellar iron abundance and surface gravity. We have also defined a single abundance indicator for the analysis of very low-signal-to-noise ratio spectra; with the further assumption of a value for the stellar surface gravity, this is able to provide useful iron abundance information from spectra having signal-to-noise ratios as low as 10 (1-A elements). The theoretical basis and calibration using synthetic spectra are described in this paper. The empirical calibration of these techniques by application to observational data is described in a separate paper (Jones, Wyse & Gilmore). The technique provides precise iron abundances, with zero-point correct to ~0.1 dex, and is reliable, with typical uncertainties being <~0.2 dex. A derivation of the in situ thick disc metallicity

  6. Differential dpa calculations with SPECTRA-PKA

    Science.gov (United States)

    Gilbert, M. R.; Sublet, J.-Ch.

    2018-06-01

    The processing code SPECTRA-PKA produces energy spectra of primary atomic recoil events (or primary knock-on atoms, PKAs) for any material composition exposed to an irradiation spectrum. Such evaluations are vital inputs for simulations aimed at understanding the evolution of damage in irradiated material, which is generated in cascade displacement events initiated by PKAs. These PKA spectra present the full complexity of the input (to SPECTRA-PKA) nuclear data-library evaluations of recoil events. However, the commonly used displacements per atom (dpa) measure, which is an integral measure over all possible recoil events of the displacement damage dose, is still widely used and has many useful applications - as both a comparative and correlative quantity. This paper describes the methodology employed that allows the SPECTRA-PKA code to evaluate dpa rates using the energy-dependent recoil (PKA) cross section data used for the PKA distributions. This avoids the need for integral displacement kerma cross sections and also provides new insight into the relative importance of different reaction channels (and associated different daughter residual and emitted particles) to the total integrated dpa damage dose. Results are presented for Fe, Ni, W, and SS316. Fusion dpa rates are compared to those in fission, highlighting the increased contribution to damage creation in the former from high-energy threshold reactions.

  7. Climatology of tropospheric vertical velocity spectra

    Science.gov (United States)

    Ecklund, W. L.; Gage, K. S.; Balsley, B. B.; Carter, D. A.

    1986-01-01

    Vertical velocity power spectra obtained from Poker Flat, Alaska; Platteville, Colorado; Rhone Delta, France; and Ponape, East Caroline Islands using 50-MHz clear-air radars with vertical beams are given. The spectra were obtained by analyzing the quietest periods from the one-minute-resolution time series for each site. The lengths of available vertical records ranged from as long as 6 months at Poker Flat to about 1 month at Platteville. The quiet-time vertical velocity spectra are shown. Spectral period ranging from 2 minutes to 4 hours is shown on the abscissa and power spectral density is given on the ordinate. The Brunt-Vaisala (B-V) periods (determined from nearby sounding balloons) are indicated. All spectra (except the one from Platteville) exhibit a peak at periods slightly longer than the B-V period, are flat at longer periods, and fall rapidly at periods less than the B-V period. This behavior is expected for a spectrum of internal waves and is very similar to what is observed in the ocean (Eriksen, 1978). The spectral amplitudes vary by only a factor of 2 or 3 about the mean, and show that under quiet conditions vertical velocity spectra from the troposphere are very similar at widely different locations.

  8. Artificial intelligence analysis of paraspinal power spectra.

    Science.gov (United States)

    Oliver, C W; Atsma, W J

    1996-10-01

    OBJECTIVE: As an aid to discrimination of sufferers with back pain an artificial intelligence neural network was constructed to differentiate paraspinal power spectra. DESIGN: Clinical investigation using surface electromyography. METHOD: The surface electromyogram power spectra from 60 subjects, 33 non-back-pain sufferers and 27 chronic back pain sufferers were used to construct a back propagation neural network that was then tested. Subjects were placed on a test frame in 30 degrees of lumbar forward flexion. An isometric load of two-thirds maximum voluntary contraction was held constant for 30 s whilst surface electromyograms were recorded at the level of the L(4-5). Paraspinal power spectra were calculated and loaded into the input layer of a three-layer back propagation network. The neural network classified the spectra into normal or back pain type. RESULTS: The back propagation neural was shown to have satisfactory convergence with a specificity of 79% and a sensitivity of 80%. CONCLUSIONS: Artificial intelligence neural networks appear to be a useful method of differentiating paraspinal power spectra in back-pain sufferers.

  9. Background noise spectra of global seismic stations

    Energy Technology Data Exchange (ETDEWEB)

    Wada, M.M.; Claassen, J.P.

    1996-08-01

    Over an extended period of time station noise spectra were collected from various sources for use in estimating the detection and location performance of global networks of seismic stations. As the database of noise spectra enlarged and duplicate entries became available, an effort was mounted to more carefully select station noise spectra while discarding others. This report discusses the methodology and criteria by which the noise spectra were selected. It also identifies and illustrates the station noise spectra which survived the selection process and which currently contribute to the modeling efforts. The resulting catalog of noise statistics not only benefits those who model network performance but also those who wish to select stations on the basis of their noise level as may occur in designing networks or in selecting seismological data for analysis on the basis of station noise level. In view of the various ways by which station noise were estimated by the different contributors, it is advisable that future efforts which predict network performance have available station noise data and spectral estimation methods which are compatible with the statistics underlying seismic noise. This appropriately requires (1) averaging noise over seasonal and/or diurnal cycles, (2) averaging noise over time intervals comparable to those employed by actual detectors, and (3) using logarithmic measures of the noise.

  10. Seismic spectra of events at regional distances

    International Nuclear Information System (INIS)

    Springer, D.L.; Denny, M.D.

    1976-01-01

    About 40 underground nuclear explosions detonated at the Nevada Test Site (NTS) were chosen for analysis of their spectra and any relationships they might have to source parameters such as yield, depth of burial, etc. The sample covered a large yield range (less than 20 kt to greater than 1 Mt). Broadband (0.05 to 20 Hz) data recorded by the four-station seismic network operated by Lawrence Livermore Laboratory were analyzed in a search for unusual explosion signatures in their spectra. Long time windows (total wave train) as well as shorter windows (for instance, P/sub n/) were used as input to calculate the spectra. Much variation in the spectra of the long windows is typical although some gross features are similar, such as a dominant peak in the microseismic window. The variation is such that selection of corner frequencies is impractical and yield scaling could not be determined. Spectra for one NTS earthquake showed more energy in the short periods (less than 1 sec) as well as in the long periods (greater than 8 sec) compared to those for NTS explosions

  11. FAST INVERSION OF SOLAR Ca II SPECTRA

    International Nuclear Information System (INIS)

    Beck, C.; Choudhary, D. P.; Rezaei, R.; Louis, R. E.

    2015-01-01

    We present a fast (<<1 s per profile) inversion code for solar Ca II lines. The code uses an archive of spectra that are synthesized prior to the inversion under the assumption of local thermodynamic equilibrium (LTE). We show that it can be successfully applied to spectrograph data or more sparsely sampled spectra from two-dimensional spectrometers. From a comparison to a non-LTE inversion of the same set of spectra, we derive a first-order non-LTE correction to the temperature stratifications derived in the LTE approach. The correction factor is close to unity up to log τ ∼ –3 and increases to values of 2.5 and 4 at log τ = –6 in the quiet Sun and the umbra, respectively

  12. Tunneling spectra of graphene on copper unraveled

    DEFF Research Database (Denmark)

    Zhang, Xin; Stradi, Daniele; Liu, Lei

    2016-01-01

    mechanisms, etc. The interpretation of the spectra can be complicated, however. Specifically for graphene grown on copper, there have been conflicting reports of tunneling spectra. A clear understanding of the mechanisms behind the variability is desired. In this work, we have revealed that the root cause...... of the variability in tunneling spectra is the variation in graphene-substrate coupling under various experimental conditions, providing a salutary perspective on the important role of 2D material-substrate interactions. The conclusions are drawn from measured data and theoretical calculations for monolayer, AB......-stacked bilayer, and twisted bilayer graphene coexisting on the same substrates in areas with and without intercalated oxygen, demonstrating a high degree of consistency. The Van Hove singularities of the twisted graphene unambiguously indicate the Dirac energy between them, lending strong evidence to our...

  13. Rotational structure in molecular infrared spectra

    CERN Document Server

    di Lauro, Carlo

    2013-01-01

    Recent advances in infrared molecular spectroscopy have resulted in sophisticated theoretical and laboratory methods that are difficult to grasp without a solid understanding of the basic principles and underlying theory of vibration-rotation absorption spectroscopy. Rotational Structure in Molecular Infrared Spectra fills the gap between these recent, complex topics and the most elementary methods in the field of rotational structure in the infrared spectra of gaseous molecules. There is an increasing need for people with the skills and knowledge to interpret vibration-rotation spectra in many scientific disciplines, including applications in atmospheric and planetary research. Consequently, the basic principles of vibration-rotation absorption spectroscopy are addressed for contemporary applications. In addition to covering operational quantum mechanical methods, spherical tensor algebra, and group theoretical methods applied to molecular symmetry, attention is also given to phase conventions and their effe...

  14. Calculation of the detection efficiency in liquid scintillators. I.- Single negatrons emitters; Calculo de la eficiencia de deteccion en liquidos centelleadores. I. Nucleidos que se desintegran por emision simple de negatrones

    Energy Technology Data Exchange (ETDEWEB)

    Grau Malonda, A.; Garcia-torano, E.

    1981-07-01

    Counting efficiency for 62 single beta emitters has been computed from the beta energy distribution, the figure of merit and the ionization quenching. Efficiency v.s. figure of merit is plotted and tabulated. (Author) 16 refs.

  15. Observed and theoretical spectra in the 10-100 A interval. [of solar spectra

    Science.gov (United States)

    Brown, W. A.; Bruner, M. E.; Acton, L. W.

    1988-01-01

    The soft X-ray spectra recorded in two sounding-rocket flights in 1982 and 1985 are compared with predicted spectra. The processed densitometer trace of the full spectrum is presented, together with the new spectrum from the 1985 experiment. The intensities of the lines are then compared with predictions.

  16. Algorithms for classification of astronomical object spectra

    Science.gov (United States)

    Wasiewicz, P.; Szuppe, J.; Hryniewicz, K.

    2015-09-01

    Obtaining interesting celestial objects from tens of thousands or even millions of recorded optical-ultraviolet spectra depends not only on the data quality but also on the accuracy of spectra decomposition. Additionally rapidly growing data volumes demands higher computing power and/or more efficient algorithms implementations. In this paper we speed up the process of substracting iron transitions and fitting Gaussian functions to emission peaks utilising C++ and OpenCL methods together with the NOSQL database. In this paper we implemented typical astronomical methods of detecting peaks in comparison to our previous hybrid methods implemented with CUDA.

  17. Nonlinear FMR spectra in yttrium iron garnet

    Directory of Open Access Journals (Sweden)

    Yu.M. Bunkov, P.M. Vetoshko, I.G. Motygullin, T.R. Safin, M.S. Tagirov, N.A. Tukmakova

    2015-12-01

    Full Text Available Results of demagnetizing effect studies in yttrium iron garnet Y3Fe5O12 thin films are reported. Experiments were performed on X-Band of electron paramagnetic resonance spectrometer at room temperature. The ferromagnetic resonance (FMR spectra were obtained for one-layer single crystal YIG films for different values of the applied microwave power. Nonlinear FMR spectra transformation by the microwave power increasing in various directions of magnetic field sweep was observed. It is explained by the influence of the demagnetization action of nonequilibrium magnons.

  18. Virtual photon spectra for finite nuclei

    International Nuclear Information System (INIS)

    Wolynec, E.; Martins, M.N.

    1988-01-01

    The experimental results of an isochromat of the virtual photon spectrum, obtained by measuring the number of ground-state protons emitted by the 16.28 MeV isobaric analogue state in 90 Zr as a function of electron incident energy in the range 17-105 MeV, are compared with the values predicted by a calculation of the E1 DWBA virtual photon spectra for finite nuclei. It is found that the calculations are in excellent agreement with the experimental results. The DWBA virtual photon spectra for finite nuclei for E2 and M1 multipoles are also assessed. (author) [pt

  19. IUE Archival Spectra of 31 Cygni

    Directory of Open Access Journals (Sweden)

    Young Woon Kang

    1991-06-01

    Full Text Available UV light curve of 31 Cygni has been made from the IUE high dispersion spectra. The depth of primary minimum of the light curve is 5.2 magnitudes because the B4 star's steep spectral gradient. The light curve has been analyzed by the method of Wilson and Devinney Differential Correction (WD. The radial velocities have been measured using the Mg II h lines. The spectroscopic elements have been determined by the method of WD. The change of the Mg II resonance doublet has been investigated based on the eight representative spectra taken at well distributed orbital phases.

  20. Approximation of Moessbauer spectra of metallic glasses

    International Nuclear Information System (INIS)

    Miglierini, M.; Sitek, J.

    1988-01-01

    Moessbauer spectra of iron-rich metallic glasses are approximated by means of six broadened lines which have line position relations similar to those of α-Fe. It is shown via the results of the DISPA (dispersion mode vs. absorption mode) line shape analysis that each spectral peak is broadened owing to a sum of Lorentzian lines weighted by a Gaussian distribution in the peak position. Moessbauer parameters of amorphous metallic Fe 83 B 17 and Fe 40 Ni 40 B 20 alloys are presented, derived from the fitted spectra. (author). 2 figs., 2 tabs., 21 refs

  1. What can we learn from inclusive spectra

    International Nuclear Information System (INIS)

    Nagamiya, S.

    1981-05-01

    The present experimental status on single particle inclusive measurements is described. Then, the geometrical aspect of the collision is discussed from the data of total integrated cross sections of nuclear charge or mass. The dynamical aspect of the collision, especially that for the participating region is discussed in connection with proton spectra, composite fragment spectra, pion production, ratios of π - /π + , n/p and t/ 3 He, and production of strange particles. The spectator physics is described from the data on projectile fragments

  2. Photoacoustic spectra of rare earth pentaphosphates

    International Nuclear Information System (INIS)

    Strek, W.; Lukowiak, E.; Marchewka, M.; Ratajczak, H.

    1987-01-01

    The photoacoustic (PA) spectra of raee earth pentaphosphates of the general formula REP 5 O 14 , where RE = Pr,Nd,Ho,Er,Tm, are reported. The photoacoustic bands were identified and compared with the absorption spectra. For quantitative analysis of PA bands of lanthanide (III) ions, the intensity ratio vector is introduced characterizing the intensity distribution of f-f transitions. It was found that the relative intensities of photoacoustic bands are comparable with the intensities of absorption bands. It is concluded that the nonradiative relaxation mechanism leading to the PA signal is independent of the manifold-to-manifold J-J' radiationless transitions

  3. Questionário sobre dificuldades comunicativas percebidas por pais de crianças do espectro do autismo Questionnaire about communicative difficulties perceived by parents of children of the autism spectrum

    Directory of Open Access Journals (Sweden)

    Juliana Izidro Balestro

    2012-01-01

    Full Text Available OBJETIVO: Elaborar um questionário para o levantamento de dificuldades comunicativas percebidas por pais e/ou cuidadores de crianças do espectro do autismo em relação a seus filhos. MÉTODOS: Os aspectos específicos abordados no questionário foram identificados a partir da literatura e da experiência clínica das autoras em dois serviços especializados. As questões foram organizadas segundo diferentes domínios e as respostas registradas numa escala tipo Likert. Foi realizado um estudo piloto com 40 pais, 20 pais de crianças do espectro do autismo e 20 pais de crianças sem queixas de linguagem, como forma de verificar a aplicabilidade do questionário construído e sua utilidade na identificação de dificuldades específicas da população alvo. Foi calculado o nível de concordância das questões e os resultados dos grupos foram comparados entre si (teste t Student. RESULTADOS: O questionário foi desenvolvido de maneira a abranger aspectos fundamentais para o relacionamento interpessoal, tanto no âmbito comunicativo quanto social. Foi dividido em 24 questões fechadas que abrangem quatro domínios; e uma questão aberta, com espaço para que os pais relatassem algo relevante e que não tenha sido perguntado. O estudo possibilitou testar a compreensão do instrumento e a análise estatística indicou que 19 questões apresentaram diferença. CONCLUSÃO: O questionário elaborado identificou diferenças na percepção e atitude de pais de crianças do espectro do autismo e de crianças sem queixa de linguagem, em relação às dificuldades de comunicação com seus filhos. Dessa forma, mostrou-se útil para o levantamento dessas dificuldades em um grupo maior de indivíduos.PURPOSE: To develop a questionnaire to the assessment of communicative difficulties perceived by parents and/or caregivers of children on the autism spectrum in relation to their children. METHODS: The specific aspects addressed by the questionnaire derived from

  4. Avaliação do espectro semântico de instrumentos para organização da informaçãoEvaluation of the semantic spectrum for information organization instruments

    Directory of Open Access Journals (Sweden)

    Renato Rocha Souza

    2011-05-01

    Full Text Available O termo "semântica" tem sido amplamente utilizado nos últimos anos em diversas áreas de pesquisa e, em particular, em áreas relacionadas à tecnologia da informação. Um dos motivadores de tal apropriação é a visão da Web Semântica, originada na expansão da web e nas limitações dos instrumentos de busca baseados em sintaxe. Cabe questionar, entretanto, qual é esta "semântica" de que trata a Web Semântica, uma vez que o estudo do assunto é complexo e controverso. O presente artigo se insere nesse contexto, analisando o que é semântica, discutindo-a no âmbito da tecnologia da informação e propondo alternativas interpretativas. Avalia-se criticamente um espectro, o qual propõe a ordenação de instrumentos (modelos, linguagens, estruturas taxonômicas, etc. de acordo com uma escala semântica. Espera-se tornar claro o uso do termo em contextos diversos, bem como propor um novo espectro a partir das considerações do presente artigo.The term “semantics” has been used over the past years in several areas of research and, more specifically, in those related to information technology. One reason for that appropriation is the Semantic Web vision, which originated from the expansion of the web and the inherent limitations of the syntax-based search engines. However, it is reasonable to demand an explanation about which is the semantics addressed in the Semantic Web since the study of the subject is complex and controversial. The present article aims to make a contribution towards this sense, analyzing what semantic is, discussing it within the scope of information technology and proposing explanatory alternatives. We intend to critically evaluate a spectrum that suggests a classification of instruments (models, languages, taxonomic structures, etc in a semantic-based scale of graduated rates. We hope to provide a better understanding about the use of the term in different contexts, as well as offer a new spectrum from the

  5. Espectro polínico de amostras de mel de Melipona mandacaia Smith, 1863 (Hymenoptera: Apidae = Pollen spectrum from honey samples of Melipona mandacaia Smith, 1863 stingless bee (Hymenoptera: Apidae

    Directory of Open Access Journals (Sweden)

    Rogério Marcos de Oliveira Alves

    2006-01-01

    Full Text Available O espectro polínico de amostras de mel da abelha Melipona mandacaia foi analisado com objetivo de elucidar os recursos alimentares utilizados por essa espécie. A identificação das plantas visitadas foi realizada com base na análise dos tipos polínicos encontrados nas amostras de mel coletadas em 11 colônias localizadas no município de São Gabriel, em área de caatinga do Estado da Bahia, Brasil (11º14’S e 41º52’W. As análises quantitativas e qualitativas foram realizadas com o objetivo de determinar as porcentagens e classes de freqüência dos tipos polínicos presentes nas amostras de mel. Foram encontrados 26 tipos polínicos, sendo o tipo Piptadenia rigida (Mimosaceae considerado dominante. Ricinus communis (Euphorbiaceae, Mimosa verrucata (Mimosaceae e M. arenosa (Mimosaceae foram considerados pólen isolado importante. As famílias mais representativas no espectro polínico das amostras de mel foram Mimosaceae, Euphorbiaceae, Asteraceae e Anacardiaceae.The pollen spectrum from honey samples of Melipona mandacaia stingless bee was analyzed aiming at elucidating the alimentaryresources used by that species. The identification of the visited plants was based on the analysis of pollen from honey samples collected in 11 hives located in São Gabriel county, in the semiarid area of Bahia State, Brazil (11º14’S and 41º52’W. The quantitative and qualitative analyses of honey samples were conducted in order to determine the pollen types percentages and frequency classes. Twenty-six pollen types were found, being the Piptadenia rigida type (Mimosaceae considered dominant. Ricinus communis (Euphorbiaceae, Mimosa verrucata (Mimosaceae and M. arenosa (Mimosaceae were considered important isolated pollen. The most representative families found in the pollen spectrum of the honey samples were Mimosaceae, Euphorbiaceae, Asteraceae and Anacardiaceae.

  6. Autismo y epigenética: Un modelo de explicación para la comprensión de la génesis en los trastornos del espectro autista

    Directory of Open Access Journals (Sweden)

    Claudia Arberas

    2013-09-01

    Full Text Available Los trastornos del espectro autista (TEA se caracterizan por presentar compromiso en la integración social, el desarrollo del lenguaje e intereses restringidos. Se expresan durante la infancia y van variando su expresión clínica a lo largo de los años; estas variaciones pueden relacionarse a los abordajes terapéuticos, drogas utilizadas para modificar conductas y factores ambientales, entre otros. Hasta el momento, las diversas alteraciones genéticas identificadas no son suficientes para explicar la génesis de todos estos procesos, incluso muchas de las mutaciones encontradas también están presentes en personas no afectadas. A través de la comprensión de las bases biológicas y fisiopatológicas de entidades fuertemente asociadas a los TEA como los síndromes de Rett, Frágil X, Angelman y Alcohol fetal, entre otros, es que se ha jerarquizado el rol de los cambios epigenéticos en los trastornos del neurodesarrollo. Los fenómenos epigenéticos son procesos biológicos normales, necesarios para la vida de la célula y del individuo, muy especialmente vinculados con el desarrollo embrionario. Los fenómenos que comprometen los distintos procesos epigenéticos (alteraciones que cambian el funcionamiento o expresión de un gen, sin haber modificado la estructura del ADN han demostrado también tener importancia en la génesis de los trastornos del neurodesarrollo. Las alteraciones del mecanismo epigenético pueden ser reversibles, lo que podría explicar la variación del fenotipo autista a lo largo del tiempo. En este trabajo analizaremos los mecanismos epigenéticos normales, los trastornos del espectro autista, su asociación con entidades específicas asociadas a mecanismos epigenéticos alterados y posibles abordajes terapéuticos relacionados a estas alteraciones.

  7. Functional Communication Profile - Revised: uma proposta de caracterização objetiva de crianças e adolescentes do espectro do autismo Functional Communication Profile - Revised: objective description of children and adolescents of the autism spectrum

    Directory of Open Access Journals (Sweden)

    Thaís Helena Ferreira Santos

    2012-12-01

    Full Text Available OBJETIVO: Caracterizar objetivamente as alterações de crianças e adolescentes incluídos no espectro do autismo de acordo com o grau de severidade definido a partir das respostas ao Functional Communication Profile - Revised (FCP-R. MÉTODOS: Foram selecionadas 50 crianças (idade média 7 anos e 11 meses com diagnósticos no espectro do autismo que foram avaliados segundo os critérios do FCP-R. As respostas obtidas foram pontuadas e classificadas de acordo com a severidade e realizada análise estatística pertinente. RESULTADOS: A caracterização dessa população evidenciou dados concordantes com a literatura, mostrando prejuízos nas áreas de linguagem (expressiva e receptiva, comportamento e pragmática, principalmente. Os indivíduos que não possuem habilidades verbais evidenciaram, ainda, alterações referentes aos domínios fala e fluência. CONCLUSÃO: O FCP-R foi sensível para caracterizar a população estudada, mostrando-se ainda mais eficaz para a avaliação individualizada.PURPOSE: To objectively characterize the alterations of autistic children and adolescents as to their severity degree, according to the answers to the Functional Communication Profile - Revised (FCP-R. METHODS: Subjects were 50 children (mean age 7 years 11 months with diagnosis within the autism spectrum that were assessed according to the FCP-R criteria. Answers were scored and classified according to severity, and the results were statistically analyzed. RESULTS: This group characterization evidenced results that agree with the literature, showing disorders mainly in the areas of language (expressive and receptive, behavior and pragmatics. Individuals without verbal communication also showed speech and fluency disorders. CONCLUSION: The FCP-R was sensitive to characterize the studied population, and even more efficient for individual assessment.

  8. Estudo do espectro sonoro nos limiares de altas frequências em trabalhadores expostos ao ruído Study of the noise spectrum on high frequency thresholds in workers exposed to noise

    Directory of Open Access Journals (Sweden)

    Aurea Oliveira Canha Ottoni

    2012-08-01

    Full Text Available O grau de nocividade do ruído pode ser quantificado e qualificado com base em algumas características do som como sua intensidade, o tipo de espectro, duração e a distribuição da exposição ao ruído durante a jornada de trabalho. OBJETIVO: Avaliar o espectro de ruído e a configuração audiométrica em trabalhadores. MATERIAIS E MÉTODOS: Estudo de coorte contemporânea com corte transversal, realizado no Distrito Federal. Realizou-se avaliação ambiental (análise espectral do ruído em empresas de diferentes ramos de atividade econômica e avaliação audiológica em 347 trabalhadores. RESULTADOS: A análise espectral revelou picos em diferentes frequências em cada ramo de atividade (8 kHz-metalúrgico, 4 kHz-marmoraria e 2 kHz-madeireira. Verificou-se que as frequências de 14 kHz e 16 kHz apresentaram diferenças significativas entre os ramos de atividade, com maior prevalência no metalúrgico. CONCLUSÃO: A utilização de medidor de nível de pressão sonora, acoplado a analisador de frequência e a avaliação audiométrica de altas frequências possibilitam a detecção precoce de danos auditivos que, por sua vez, viabiliza melhor direcionamento das ações preventivas.Noise level can be quantified and qualified based on sound characteristics such as intensity, type of spectrum, duration and distribution of the noise exposure during one's working hours. OBJECTIVE: To assess noise spectrum and the audiometric configuration of workers. MATERIALS AND METHODS: Contemporary cross-sectional cohort carried out in the Federal District - Brazil. We did an environmental analysis (spectral analysis of the noise in companies from different industries, with audiological assessment of 347 workers. RESULTS: The spectral analysis revealed peaks at different frequencies for each industry investigated (8 kHz-metallurgical, 4 kHz-stone Works and 2 kHz-wood works. We noticed that the frequencies of 14 kHz and 16 kHz had significant differences

  9. Adjuvantes nas propriedades físicas da calda, espectro e eficiência de eletrificação das gotas utilizando a pulverização eletrostática

    Directory of Open Access Journals (Sweden)

    Robson Shigueaki Sasaki

    2015-02-01

    Full Text Available Os adjuvantes têm sido empregados na pulverização de agrotóxicos, entretanto, ainda se carece de informações sobre o efeito destes produtos, principalmente quando se emprega o sistema eletrostático. O presente trabalho foi conduzido com o objetivo de avaliar dez soluções de pulverização (nove adjuvantes e uma testemunha, quanto às propriedades físicas (viscosidade e condutividade elétrica e quanto ao espectro e a eficiência de eletrificação da gota na pulverização eletrostática. Utilizou-se um pulverizador eletrostático da marca Electrostatic Spraying Systems e modelo MB 4.0. Para avaliar a viscosidade, a metodologia de Ostwald foi utilizada, enquanto a condutividade elétrica foi determinada com uso de um condutivímetro, marca Marte e modelo MB-11. Na análise da carga elétrica presente na gota, utilizou-se a metodologia da gaiola de Faraday e a avaliação do espectro foi realizada por meio de um analisador de partículas a laser (Spraytech Malvern(r. Os adjuvantes testados alteraram a viscosidade da calda, variando entre 0,94 e 1,03mPa s. Para a condutividade elétrica, observou-se que a água apresentou 67,7µS cm-1 e, com o uso de adjuvantes, o valor obtido foi de até 607,5µS cm-1. Quanto à eletrificação das gotas, houve aumento de até 50,14% na relação Q/M com o uso de adjuvantes, demonstrando que auxiliam na pulverização eletrostática. De forma geral, os adjuvantes reduziram o diâmetro das gotas pulverizadas

  10. Analysis of COSIMA spectra: Bayesian approach

    Directory of Open Access Journals (Sweden)

    H. J. Lehto

    2015-06-01

    secondary ion mass spectrometer (TOF-SIMS spectra. The method is applied to the COmetary Secondary Ion Mass Analyzer (COSIMA TOF-SIMS mass spectra where the analysis can be broken into subgroups of lines close to integer mass values. The effects of the instrumental dead time are discussed in a new way. The method finds the joint probability density functions of measured line parameters (number of lines, and their widths, peak amplitudes, integrated amplitudes and positions. In the case of two or more lines, these distributions can take complex forms. The derived line parameters can be used to further calibrate the mass scaling of TOF-SIMS and to feed the results into other analysis methods such as multivariate analyses of spectra. We intend to use the method, first as a comprehensive tool to perform quantitative analysis of spectra, and second as a fast tool for studying interesting targets for obtaining additional TOF-SIMS measurements of the sample, a property unique to COSIMA. Finally, we point out that the Bayesian method can be thought of as a means to solve inverse problems but with forward calculations, only with no iterative corrections or other manipulation of the observed data.

  11. Vibrational spectra for hydrogenated amorphous semiconductors

    International Nuclear Information System (INIS)

    Kamitakahara, W.A.; Bouchard, A.M.; Biswas, R.; Gompf, F.; Suck, J.B.

    1990-01-01

    Hydrogen vibration spectra have been measured by neutron scattering for several amorphous semiconductor materials, including a-Ge:H and a-SiC:H samples containing about 10 at. % H. The data for a-Ge:H are compared in detail with the results of realistic computer simulations

  12. RAMAN-SPECTRA OF HUMAN DENTAL CALCULUS

    NARCIS (Netherlands)

    TSUDA, H; ARENDS, J

    1993-01-01

    Raman spectra of human dental calculus have been observed for the first time by use of micro-Raman spectroscopy. The spectral features of calculus were influenced easily by heating caused by laser irradiation. Therefore, the measurements were carried out at relatively low power (5 mW, 1-mu m spot

  13. Automatic analysis of charged particle spectra

    International Nuclear Information System (INIS)

    Seres, Z.; Kiss, A.

    1975-11-01

    A computer program system is developed for off-line automatic analysis of a series of charged particle spectra measured by solid-state detectors and collected on magnetic tapes. The procedure results in complete angular distributions for the excited levels of the final nucleus up to about 15 MeV. (orig.) [de

  14. An adaptive method for γ spectra smoothing

    International Nuclear Information System (INIS)

    Xiao Gang; Zhou Chunlin; Li Tiantuo; Han Feng; Di Yuming

    2001-01-01

    Adaptive wavelet method and multinomial fitting gliding method are used for smoothing γ spectra, respectively, and then FWHM of 1332 keV peak of 60 Co and activities of 238 U standard specimen are calculated. Calculated results show that adaptive wavelet method is better than the other

  15. INTRAMOLECULAR ISOTOPE EFFECTS IN HYDROCARBON MASS SPECTRA

    Energy Technology Data Exchange (ETDEWEB)

    Stevenson, D. P.; Schachtschneider, J. H.

    1963-07-15

    Approximate calculations based on the quasi-equilibrium rate theory of the origin of mass spectra are shown to lead to an approximately correct magnitude for the intramolecular ( pi /sup -/) isotope effect on C--H bond dissociation probabilities of various deuterohydrocarbons. (auth)

  16. Library search with regular reflectance IR spectra

    International Nuclear Information System (INIS)

    Staat, H.; Korte, E.H.; Lampen, P.

    1989-01-01

    Characterisation in situ for coatings and other surface layers is generally favourable, but a prerequisite for precious items such as art objects. In infrared spectroscopy only reflection techniques are applicable here. However for attenuated total reflection (ATR) it is difficult to obtain the necessary optical contact of the crystal with the sample, when the latter is not perfectly plane or flexible. The measurement of diffuse reflectance demands a scattering sample and usually the reflectance is very poor. Therefore in most cases one is left with regular reflectance. Such spectra consist of dispersion-like feature instead of bands impeding their interpretation in the way the analyst is used to. Furthermore for computer search in common spectral libraries compiled from transmittance or absorbance spectra a transformation of the reflectance spectra is needed. The correct conversion is based on the Kramers-Kronig transformation. This somewhat time - consuming procedure can be speeded up by using appropriate approximations. A coarser conversion may be obtained from the first derivative of the reflectance spectrum which resembles the second derivative of a transmittance spectrum. The resulting distorted spectra can still be used successfully for the search in peak table libraries. Experiences with both transformations are presented. (author)

  17. Chaotic spectra: How to extract dynamic information

    International Nuclear Information System (INIS)

    Taylor, H.S.; Gomez Llorente, J.M.; Zakrzewski, J.; Kulander, K.C.

    1988-10-01

    Nonlinear dynamics is applied to chaotic unassignable atomic and molecular spectra with the aim of extracting detailed information about regular dynamic motions that exist over short intervals of time. It is shown how this motion can be extracted from high resolution spectra by doing low resolution studies or by Fourier transforming limited regions of the spectrum. These motions mimic those of periodic orbits (PO) and are inserts into the dominant chaotic motion. Considering these inserts and the PO as a dynamically decoupled region of space, resonant scattering theory and stabilization methods enable us to compute ladders of resonant states which interact with the chaotic quasi-continuum computed in principle from basis sets placed off the PO. The interaction of the resonances with the quasicontinuum explains the low resolution spectra seen in such experiments. It also allows one to associate low resolution features with a particular PO. The motion on the PO thereby supplies the molecular movements whose quantization causes the low resolution spectra. Characteristic properties of the periodic orbit based resonances are discussed. The method is illustrated on the photoabsorption spectrum of the hydrogen atom in a strong magnetic field and on the photodissociation spectrum of H 3 + . Other molecular systems which are currently under investigation using this formalism are also mentioned. 53 refs., 10 figs., 2 tabs

  18. Polarization Spectra of Extrasolar Giant Planets

    NARCIS (Netherlands)

    Stam, D.M.

    2004-01-01

    We present simulated spectra of the flux and degree of polarization of starlight that is reflected by extrasolar giant planets (EGPs). In particular the polarization depends strongly on the structure of the planetary atmosphere, and appears to be a valuable tool for the characterization of EGPs.

  19. Temperatures of fragment kinetic energy spectra

    International Nuclear Information System (INIS)

    Bauer, W.

    1995-01-01

    Multifragmentation reactions without large compression in the initial state (proton-induced reactions, reverse kinematics, projectile fragmentation) are examined, and it is verified quantitatively that the high temperatures obtained from fragment kinetic energy spectra and lower temperatures obtained from observables such as level population or isotope ratios can be understood in a common framework

  20. A comparison of floor response spectra techniques

    International Nuclear Information System (INIS)

    Yan, M.J.; Galford, J.E.

    1983-01-01

    Floor response spectra (FRS) conventionally have been generated using a time-history method. Babcock and Wilcox has developed a new technique, the Fast Floor Response Spectra (FFRS) method, in which dynamic analyses are done entirely in the frequency domain. This paper compares the two techniques and demonstrates that the FFRS method complies with the 'equivalency' and 'conservatism' requirements of the US NRC's Standard Review Plan. The upper end of a once-through steam generator in the B and W 205 nuclear steam supply system (NSSS) was used to demonstrate that the FFRS method is equivalent to the time-history technique. The two techniques were compared with respect to frequency content and magnitude of response for a given point on the structure. First, the specified forcing function was described in terms of an acceleration time history and an acceleration spectra enveloping that time history. The time-history forcing function was then used in a direct transient analysis to determine the response at the specified point on the NSSS. The resultant response was subsequently converted to a floor response spectra for that point. To show that the FFRS method gave equivalent and conservative results, the FFRS technique was used to determine the modal response directly from the spectral description of the forcing function. The FFRS- and time-history-generated data agreed to within 13 (worst case on conservative side) of each other with the former cutting analytical costs by 99%. (orig./HP)

  1. Microdosimetric spectra measurements of JANUS neutrons

    Energy Technology Data Exchange (ETDEWEB)

    Marshall, I.R.; Williamson, F.S.

    1985-01-01

    Neutron radiation from the JANUS reactor at Argonne National Laboratory is being used with increasing frequency for major biological experiments. The fast neutron spectrum has a Kerma-weighted mean energy of 0.8 MeV and low gamma-ray contamination. In 1984 the JANUS fission converter plate of highly enriched uranium was replaced by one made of low-enriched uranium. We recorded microdosimetric spectra at several different positions in the high-flux irradiation room of JANUS before the change of the converter plate. Each set of measurements consisted of spectra taken at three different site diameters (0.5, 1.0, and 5.0 ..mu..m) and in both ''attenuator up'' and ''attenuator down'' configurations. At two conventional dosimetry reference positions, two sets of measurements were recorded. At three biological reference positions, measurements simulating several biological irradiation conditions, were taken. The dose rate at each position was estimated and compared with dose rates obtained previously by conventional dosimetry. Comparison of the different measurements showed no major change in spectra as a function of position or irradiation condition. First results from similar sets of measurements recorded after the installment of the new converter plate indicate no major change in the spectra. 11 refs., 4 figs., 5 tabs.

  2. Mass Spectra of Tetraselenafulvalenes, Diselenadithiafulvalenes and Tetrathiafulvalenes

    DEFF Research Database (Denmark)

    Andersen, Jan Rud; Egsgaard, Helge; Larsen, Elfinn

    1978-01-01

    fragmentation of the molecular ion, as the selenium fulvalenes lose an alkyne molecule, whereas the sulphur fulvalenes first lose an (SĊR) radical. An important feature of the spectra of the simple heterofulvalenes is the formation of a rearrangement ion by migration of a heteroatom. The mechanism...

  3. Analysis of low-intensity scintillation spectra

    International Nuclear Information System (INIS)

    Muravsky, V.; Tolstov, S.A.

    2002-01-01

    The maximum likelihood algorithms for nuclides activities estimation from low intensity scintillation γ-ray spectra have been created. The algorithms treat full energy peaks and Compton parts of spectra, and they are more effective than least squares estimators. The factors that could lead to the bias of activity estimates are taken into account. Theoretical analysis of the problem of choosing the optimal set of initial spectra for the spectrum model to minimize errors of the activities estimation has been carried out for the general case of the N-components with Gaussian or Poisson statistics. The obtained criterion allows to exclude superfluous initial spectra of nuclides from the model. A special calibration procedure for scintillation γ-spectrometers has been developed. This procedure is required for application of the maximum likelihood activity estimators processing all the channels of the scintillation γ-spectrum, including the Compton part. It allows one to take into account the influence of the sample mass density variation. The algorithm for testing the spectrum model adequacy to the processed scintillation spectrum has been developed. The algorithms are realized in Borland Pascal 7 as a library of procedures and functions. The developed library is compatible with Delphi 1.0 and higher versions. It can be used as the algorithmic basis for analysis of highly sensitive scintillation γ- and β-spectrometric devices. (author)

  4. Ultraviolet spectra of Mg in liquid helium

    International Nuclear Information System (INIS)

    Moriwaki, Y.; Morita, N.

    1999-01-01

    Emission and absorption spectra of Mg atoms implanted in liquid helium have been observed in the ultraviolet region. We have presented a model of exciplex formation of Mg-He 10 and found that this model is more suitable for understanding the dynamics in the 3s3p 1 P→3s 21 S transition than the bubble model. (orig.)

  5. Raman spectra of lignin model compounds

    Science.gov (United States)

    Umesh P. Agarwal; Richard S. Reiner; Ashok K. Pandey; Sally A. Ralph; Kolby C. Hirth; Rajai H. Atalla

    2005-01-01

    To fully exploit the value of Raman spectroscopy for analyzing lignins and lignin containing materials, a detailed understanding of lignins’ Raman spectra needs to be achieved. Although advances made thus far have led to significant growth in application of Raman techniques, further developments are needed to improve upon the existing knowledge. Considering that lignin...

  6. Microdosimetric spectra measurements of JANUS neutrons

    International Nuclear Information System (INIS)

    Marshall, I.R.; Williamson, F.S.

    1985-01-01

    Neutron radiation from the JANUS reactor at Argonne National Laboratory is being used with increasing frequency for major biological experiments. The fast neutron spectrum has a Kerma-weighted mean energy of 0.8 MeV and low gamma-ray contamination. In 1984 the JANUS fission converter plate of highly enriched uranium was replaced by one made of low-enriched uranium. We recorded microdosimetric spectra at several different positions in the high-flux irradiation room of JANUS before the change of the converter plate. Each set of measurements consisted of spectra taken at three different site diameters (0.5, 1.0, and 5.0 μm) and in both ''attenuator up'' and ''attenuator down'' configurations. At two conventional dosimetry reference positions, two sets of measurements were recorded. At three biological reference positions, measurements simulating several biological irradiation conditions, were taken. The dose rate at each position was estimated and compared with dose rates obtained previously by conventional dosimetry. Comparison of the different measurements showed no major change in spectra as a function of position or irradiation condition. First results from similar sets of measurements recorded after the installment of the new converter plate indicate no major change in the spectra. 11 refs., 4 figs., 5 tabs

  7. Nuclear Neutrino Spectra in Late Stellar Evolution

    Science.gov (United States)

    Misch, G. Wendell; Sun, Yang; Fuller, George

    2018-05-01

    Neutrinos are the principle carriers of energy in massive stars, beginning from core carbon burning and continuing through core collapse and after the core bounce. In fact, it may be possible to detect neutrinos from nearby pre-supernova stars. Therefore, it is of great interest to understand the neutrino energy spectra from these stars. Leading up to core collapse, beginning around core silicon burning, nuclei become dominant producers of neutrinos, particularly at high neutrino energy, so a systematic study of nuclear neutrino spectra is desirable. We have done such a study, and we present our sd-shell model calculations of nuclear neutrino energy spectra for nuclei in the mass number range A = 21 - 35. Our study includes neutrinos produced by charged lepton capture, charged lepton emission, and neutral current nuclear deexcitation. Previous authors have tabulated the rates of charged current nuclear weak interactions in astrophysical conditions, but the present work expands on this not only by providing neutrino energy spectra, but also by including the heretofore untabulated neutral current de-excitation neutrino pairs.

  8. Variations on supersymmetry breaking and neutrino spectra

    International Nuclear Information System (INIS)

    Borzumati, F.; Hamaguchi, K.; Nomura, Y.; Yanagida, T.

    2000-01-01

    The problem of generating light neutrinos within supersymmetric models is discussed. It is shown that the hierarchy of scales induced by supersymmetry breaking can give rise to suppression factors of the correct order of magnitude to produce experimentally allowed neutrino spectra

  9. Autonomous System Design for Moessbauer Spectra Acquisition

    International Nuclear Information System (INIS)

    Morales, A. L.; Zuluaga, J.; Cely, A.; Tobon, J.

    2001-01-01

    An autonomous system for Moessbauer spectroscopy based in a microcontroller has been designed. A timer of the microcontroller was used to generate the control signal for the Moessbauer linear motor, and a counter for the spectra acquisition. Additionally, the system has its own memory for data storage and a serial port to transmit the data to a computer for its later processing and display

  10. Fitting PAC spectra with a hybrid algorithm

    Energy Technology Data Exchange (ETDEWEB)

    Alves, M. A., E-mail: mauro@sepn.org [Instituto de Aeronautica e Espaco (Brazil); Carbonari, A. W., E-mail: carbonar@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (Brazil)

    2008-01-15

    A hybrid algorithm (HA) that blends features of genetic algorithms (GA) and simulated annealing (SA) was implemented for simultaneous fits of perturbed angular correlation (PAC) spectra. The main characteristic of the HA is the incorporation of a selection criterion based on SA into the basic structure of GA. The results obtained with the HA compare favorably with fits performed with conventional methods.

  11. Savannah River Site disaggregated seismic spectra

    International Nuclear Information System (INIS)

    Stephenson, D.E.

    1993-02-01

    The objective of this technical note is to characterize seismic ground motion at the Savannah River Site (SRS) by postulated earthquakes that may impact facilities at the site. This task is accomplished by reviewing the deterministic and probabilistic assessments of the seismic hazard to establish the earthquakes that control the hazard to establish the earthquakes that control the hazard at the site and then evaluate the associated seismic ground motions in terms of response spectra. For engineering design criteria of earthquake-resistant structures, response spectra serve the function of characterizing ground motions as a function of period or frequency. These motions then provide the input parameters that are used in the analysis of structural response. Because they use the maximum response, the response spectra are an inherently conservative design tool. Response spectra are described in terms of amplitude, duration, and frequency content, and these are related to source parameters, travel path, and site conditions. Studies by a number of investigators have shown by statistical analysis that for different magnitudes the response spectrum values are different for differing periods. These facts support Jennings' position that using different shapes of design spectra for earthquakes of different magnitudes and travel paths is a better practice than employing a single, general-purpose shape. All seismic ground motion characterization results indicate that the PGA is controlled by a local event with M w < 6 and R < 30km. The results also show that lower frequencies are controlled by a larger, more distant event, typically the Charleston source. The PGA of 0.2 g, based originally on the Blume study, is consistent with LLNL report UCRL-15910 (1990) and with the DOE position on LLNL/EPRI

  12. Improving interpretation of infrared spectra for OM characterization by subtraction of spectra from incinerated samples

    Science.gov (United States)

    Ellerbrock, Ruth H.; Gerke, Horst H.; Leue, Martin

    2017-04-01

    Non-destructive methods such as diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) have been applied to characterize organic matter (OM) at intact structural surfaces among others. However, it is often difficult to distinguish effects of organic components on DRIFT signal intensities from those of mineral components. The objective of this study was to re-evaluate DRIFT spectra from intact earthworm burrow walls and coated cracks to improve the interpretation of C-H and C=O bands. We compared DRIFT and transmission Fourier transform infrared (FTIR) spectra of entire samples that were from the same pedogenetic soil horizon, but different in mineral composition and texture (i.e., glacial till versus loess). Spectra of incinerated samples were subtracted from the original spectra. Transmission FTIR and DRIFT spectra were almost identical for entire soil samples. However, the DRIFT spectra were affected by the bulk mode bands (i.e., wavenumbers 2000 to 1700 cm-1) that affected spectral resolution and reproducibility. The ratios between C-H and C=O band intensities as indicator for OM quality obtained with DRIFT were smaller than those obtained from transmission FTIR. A spectral subtraction procedure was found to reduce effects of mineral absorption bands on DRIFT spectra allowing an improved interpretation. DRIFT spectroscopy as a non-destructive method for analyzing OM composition at intact surfaces in structured soils could be calibrated with information obtained with the more detailed transmission FTIR and complementary methods.

  13. Observational and theoretical spectra of supernovae

    Science.gov (United States)

    Wheeler, J. Craig; Swartz, Douglas A.; Harkness, Robert P.

    1993-05-01

    Progress in nuclear astrophysics by means of quantitative supernova spectroscopy is discussed with special concentration on type Ia, Ib and Ic and on SN 1987A. Spectral calculations continue to support an exploding C/O white dwarf as the best model of a SN Ia. Deflagration model W7 produces good maximum light spectra of SN Ia and seems to have a better composition distribution compared to delayed detonation models, but proper treatment of opacity remains a problem and the physical basis of SN Ia explosions is still not completely understood. All models for SN Ia predict large quantities of 56Co in the ejecta, but it is not clear that observations confirm this. Although the evolutionary origin of SN Ia remains uncertain, there is recent evidence that transfer of hydrogen in a binary system may be involved, as long suspected. There has been progress in comparing dynamical models with the optical/IR spectra of SN 1987A. The evolution of the [OI] λλ6300, 6364 feature and the presence of strong persistent HeI λ10 830 indicate that both the envelope and core material contribute substantially to the formation of emission lines in the nebular phase and that neither the core nor the envelope can be neglected. Blending with nearby hydrogen lines may affect both of these spectral features, thereby complicating the analysis of the lines. The effects of continuum transfer and photoionization have been included and are under study. The discrepancies between theoretical and observed spectra are due primarily to the one-dimensional hydrodynamic models. The spectral data are not consistent with the high density ``spike'' (in radial coordinate) of the core material that is predicted by all such models. Analysis of the light curves of SN Ib and SN Ic supernovae implies that there are significant differences in their physical properties. Some SN Ib have considerably more ejecta mass than SN Ic events. SN Ib require He-rich atmospheres to produce the observed strong optical lines of

  14. Epidemiology of extended spectrum β-lactamase producing Enterobacter bacteremia in a brazilian hospital Epidemiologia de bacteremia causadas por Enterobacter produtores de β-lactamases de espectro estendido em um hospital brasileiro

    Directory of Open Access Journals (Sweden)

    Felipe Francisco Tuon

    2010-08-01

    Full Text Available INTRODUCTION: Enterobacter can be included in the group of extended spectrum β-lactamases (EBSL-producing bacteria, though few studies exist evaluating risk factors associated with this microorganism. A retrospective cohort study was conducted to determine risk factors associated with ESBL-producing-Enterobacter and mortality METHODS: A retrospective cohort study with 58 bacteremia caused by ESBL-producing-Enterobacter (28 cases and non-ESBL (30 cases RESULTS: Risk factors associated with ESBL-Enterobacter were trauma, length of hospitalization, admission to the intensive care unit, urinary catheter and elective surgery (pINTRODUÇÃO: Enterobacter pode ser incluído no grupo de bactérias produtoras de β-lactamases de espectro estendido (ESBL, mas existem poucos estudos avaliando fatores de risco para ESBL. Nós realizamos uma coorte retrospective para determiner fatores de risco associados com Enterobacter produtores de ESBL MÉTODOS: Uma coorte retrospectiva com 58 bacteremias por Enterobacter ESBL (28 casos e não-ESBL (30 casos RESULTADOS: Fatores de risco para ESBL-Enterobacter foram trauma, tempo de internação, admissão em UTI, sonda vesical e cirurgia eletiva (p<0.05. A mortalidade foi similar entre ESBL e não-ESBL CONCLUSÕES: Enterobacter produtor de ESBL é prevalente e a curva de mortalidade foi semelhante com o grupo não-ESBL.

  15. Acoso escolar como factor limitante en la inclusión educativa de niños, niñas y jóvenes con trastornos del espectro autista

    Directory of Open Access Journals (Sweden)

    Maribel Uribarrí Vázquez

    2016-01-01

    Full Text Available Esta investigación tuvo como propósito analizar el acoso escolar como factor limitante en la inclusión educativa de niños, niñas y jóvenes con Trastornos del Espectro Autista (TEA. La sustentación teórica se basó en la doctrina de Delgado,  Serrano, Olweusy,  Roldan,  entre otros. El tipo de investigación fue cualitativo con  método fenomenológico a través de entrevistas a profundidad y notas de campo. La  selección de informantes clave fue de7 estudiantes con TEA  asistentes a escuelas regulares. Se concluye que el acoso escolar genera en alumnos con TEA, sentimientos de inadecuación e inadaptación que conllevan al  aislamiento,    exclusión social, resistencia y deserción escolar.

  16. Communication system and spectral analysis for Ge-Li and GeHp detectors; Sistema de comunicaciones y analisis de espectros para detectores Ge-Li y GeHp

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, J; Castano, P; Bonino, A D; Righetti, M A

    1991-12-31

    An integral communication and spectral analysis system (SICADE) was developed and implemented to satisfy the need to optimize and automate the measurement system used in Atucha I nuclear power plant for the activity in the primary loop`s water extracted by the TV system. The importance of these measurements is based on the fact that from the spectrometric analysis of the samples extracted, the Iodines-GN and Iodines-Iodines relations, which allow to detect the presence of deficient fuel elements, are calculated. The system developed is based on two modules integrated in a unique set commanded by the operators through the screen dialogue. (Author). [Espanol] Dada la necesidad de optimizar y automatizar el sistema de medicion utilizado en la Central Nuclear Atucha I para la actividad en el agua del circuito primario extraida a traves del sistema TV se desarrollo e implemento un sistema integral de Comunicacion y Analisis de espectros (SICADE). La importancia de estas mediciones radica en el hecho que del analisis espectrometrico de las muestras extraidas se calculan las relaciones entre Iodos-GN e Iodos-Iodos que permiten detectar la presencia de elementos combustibles fallados. El sistema desarrollado esta basado en dos modulos integrados en un unico conjunto comandado por el operador a traves del dialogo por pantalla. (Autor).

  17. Ajuste de parámetros libres en teorías de campos camaleones a partir de espectros de nubes moleculares galácticas y experimentos terrestres

    Science.gov (United States)

    Teppa Pannia, F. A.; Landau, S. J.

    Resultados recientes, basados en el análisis de espectros moleculares de nubes galácticas a través del método del amoníaco, han arrojado nuevos límites sobre la variación del parámetro adimensional μ=m_e /m_p. Los resultados indican Δ μ/μ = (μ_{obs}-μ_{lab})/μ_{lab}= (2.2± 0.4_{est} ±0.3_{sist}) times 10 ^{-8}, en acuerdo con una variación no nula de dicha cantidad (Levshakov et al. 2010). En este trabajo, motivado por los datos astronómicos, estudiamos la solución lineal del modelo teórico fenomenológico de campo escalar camaleón, presentado por Mota y Shaw (2007), que predice variaciones en μ. Con el fin de cotejar estas predicciones con los resultados observacionales, utilizamos datos de experimentos terrestres que testean violaciones al Principio de Equivalencia para analizar el valor de los parámetros libres presentes en el modelo. El trabajo realizado muestra que la solución estudiada no se puede ajustar a los datos experimentales, sugiriendo que el modelo lineal debe ser descartado para explicar las observaciones astronómicas. FULL TEXT IN SPANISH

  18. Remarks about the displaced spectra techniques

    International Nuclear Information System (INIS)

    Behringer, K.; Pineyro, J.

    1989-01-01

    In a recent paper a new method, called displaced spectra techniques, was presented for distinguishing between sinusoidal components and narrowband random noise contributions in otherwise random noise data. It is based on Fourier transform techniques, and uses the power spectral density (PSD) and a newly-introduced second-order displaced power spectra density (SDPSD) function. In order to distinguish between the two peak types, a validation criterion has been established. In this note, three topics are covered: a) improved numerical data for the validation criterion are given by using the refined estimation procedure of the PSD and SDPSD functions by the Welch method; b) the validation criterion requires the subtraction of the background below the peaks. A semiautomatic procedure is described; c) it was observed that peaks in the real part of the SDPSD function can be accompanied by fine structure phenomena which are unresolved in the PSD function. A few remarks are made about this problem. (author)

  19. EPR spectra of some irradiated polycrystalline perrhenate

    International Nuclear Information System (INIS)

    Zaitseva, N.G.; Constantinescu, M.; Georgescu, R.; Constantinescu, O.

    1978-10-01

    An EPR study of the paramagnetic centers formed by γ, electron and neutron irradiation of the NaReO 4 and KReO 4 was made. In the EPR spectra of the powder samples irradiated γ, with electrons and neutrons, the presence of three types of paramagnetic centers was observed. From the EPR parameters, the centers were attributed to the ReOsub(4)sup(.), ReOsub(3)sup(.) and ReOsub(2)sup(.) radicals respectively. The lower intensity of the spectra observed by KReO 4 samples irradiation showed a higher radioresistance of the KReO 4 than that of NaReO 4 . A radiolitical scheme taking into account the paramagnetic centers formation was proposed. (author)

  20. Raman spectra of filled carbon nanotubes

    International Nuclear Information System (INIS)

    Bose, S.M.; Behera, S.N.; Sarangi, S.N.; Entel, P.

    2004-01-01

    The Raman spectra of a metallic carbon nanotube filled with atoms or molecules have been investigated theoretically. It is found that there will be a three way splitting of the main Raman lines due to the interaction of the nanotube phonon with the collective excitations (plasmons) of the conduction electrons of the nanotube as well as its coupling with the phonon of the filling material. The positions and relative strengths of these Raman peaks depend on the strength of the electron-phonon interaction, phonon frequency of the filling atom and the strength of interaction of the nanotube phonon and the phonon of the filling atoms. Careful experimental studies of the Raman spectra of filled nanotubes should show these three peaks. It is also shown that in a semiconducting nanotube the Raman line will split into two and should be observed experimentally

  1. Interpreting peptide mass spectra by VEMS

    DEFF Research Database (Denmark)

    Mathiesen, Rune; Lundsgaard, M.; Welinder, Karen G.

    2003-01-01

    the calculated and the experimental mass spectrum of the called peptide. The program package includes four accessory programs. VEMStrans creates protein databases in FASTA format from EST or cDNA sequence files. VEMSdata creates a virtual peptide database from FASTA files. VEMSdist displays the distribution......Most existing Mass Spectra (MS) analysis programs are automatic and provide limited opportunity for editing during the interpretation. Furthermore, they rely entirely on publicly available databases for interpretation. VEMS (Virtual Expert Mass Spectrometrist) is a program for interactive analysis...... of peptide MS/MS spectra imported in text file format. Peaks are annotated, the monoisotopic peaks retained, and the b-and y-ion series identified in an interactive manner. The called peptide sequence is searched against a local protein database for sequence identity and peptide mass. The report compares...

  2. Benchmarking statistical averaging of spectra with HULLAC

    Science.gov (United States)

    Klapisch, Marcel; Busquet, Michel

    2008-11-01

    Knowledge of radiative properties of hot plasmas is important for ICF, astrophysics, etc When mid-Z or high-Z elements are present, the spectra are so complex that one commonly uses statistically averaged description of atomic systems [1]. In a recent experiment on Fe[2], performed under controlled conditions, high resolution transmission spectra were obtained. The new version of HULLAC [3] allows the use of the same model with different levels of details/averaging. We will take advantage of this feature to check the effect of averaging with comparison with experiment. [1] A Bar-Shalom, J Oreg, and M Klapisch, J. Quant. Spectros. Rad. Transf. 65, 43 (2000). [2] J. E. Bailey, G. A. Rochau, C. A. Iglesias et al., Phys. Rev. Lett. 99, 265002-4 (2007). [3]. M. Klapisch, M. Busquet, and A. Bar-Shalom, AIP Conference Proceedings 926, 206-15 (2007).

  3. The new NIST atomic spectra database

    International Nuclear Information System (INIS)

    Kelleher, D.E.; Martin, W.C.; Wiese, W.L.; Sugar, J.; Fuhr, J.R.; Olsen, K.; Musgrove, A.; Mohr, P.J.; Reader, J.; Dalton, G.R.

    1999-01-01

    The new atomic spectra database (ASD), Version 2.0, of the National Institute of Standards and Technology (NIST) contains significantly more data and covers a wider range of atomic and ionic transitions and energy levels than earlier versions. All data are integrated. It also has a new user interface and search engine. ASD contains spectral reference data which have been critically evaluated and compiled by NIST. Version 2.0 contains data on 900 spectra, with about 70000 energy levels and 91000 lines ranging from about 1 Aangstroem to 200 micrometers, roughly half of which have transition probabilities with estimated uncertainties. References to the NIST compilations and original data sources are listed in the ASD bibliography. A detailed ''Help'' file serves as a user's manual, and full search and filter capabilities are provided. (orig.)

  4. Graphics based PC analysis of alpha spectra

    International Nuclear Information System (INIS)

    Chapman, T.C.

    1991-01-01

    New personal computer (PC) software performs interactive analysis of alpha spectra using EGA graphics. Spectra are collected with a commercial MCA board and analyzed using the software described here. The operator is required to approve each peak integration area before analysis proceeds. Sample analysis can use detector efficiencies or spike yields or both. Background corrections are made and upper limit values are calculated when specified. Nuclide identification uses a library of up to 64 nuclides with up to 8 alpha lines for each nuclide. Any one of 32 subset libraries can be used in an analysis. Analysis time is short and is limited by interaction with the operator, not by calculation time. Utilities include nuclide library editing, library subset editing, energy calibration, efficiency calibration, and background update

  5. Predicting transmittance spectra of electrophotographic color prints

    Science.gov (United States)

    Mourad, Safer; Emmel, Patrick; Hersch, Roger D.

    2000-12-01

    For dry toner electrophotographic color printers, we present a numerical simulation model describing the color printer responses based on a physical characterization of the different electrophotographic process steps. The proposed model introduces a Cross Transfer Efficiency designed to predict the color transmittance spectra of multi-color prints by taking into account the transfer influence of each deposited color toner layer upon the other layers. The simulation model leads to a better understanding of the factors that have an impact on printing quality. In order to avoid the additional optical non-linearities produced by light reflection on paper, we have limited the present investigation to transparency prints. The proposed model succeeded to predict the transmittance spectra of printed wedges combining two color toner layers with a mean deviation less than CIE-LAB (Delta) E equals 2.5.

  6. Measurement and interpretation of plutonium spectra

    International Nuclear Information System (INIS)

    Blaise, J.; Fred, M.S.; Carnall, W.T.; Crosswhite, H.M.; Crosswhite, H.

    1982-01-01

    The atomic spectroscopic data available for plutonium are among the rickest of any in the periodic system. They include high-resolution grating and Fourier-transform spectra as well as extensive Zeeman and isotope-shift studies. We summarize the present status of the term analysis and cite the configurations that have been identified. A least-squares adjustment of a parametric Hamiltonian for configurations of both Pu I and Pu II has shown that almost all of the expected low levels are now known. The use of a model Hamiltonian applicable to both lanthanide and actinide atomic species has been applied to the low configurations of Pu I and Pu II making use of trends predicted by ab initio calculations. This same model has been used to describe the energy levels of Pu 3+ in LaCl 3 , and an extension has permitted preliminary calculations of the spectra of other valence states

  7. The XUV spectra of highly ionised molybdenum

    International Nuclear Information System (INIS)

    Mansfield, M.W.D.; Peacock, N.J.; Smith, C.C.; Hobby, M.G.; Cowan, R.D.

    1978-01-01

    The spectra of molybdenum ions produced in Tokamaks in the wavelength range 10-200 A have been reproduced in a plasma formed by laser beam irradiation of solid molybdenum targets. Lines from highly ionised stages of molybdenum (Mo XXX to Mo XXXII) have been distinguished by varying the laser beam intensity. Detailed analyses of the simpler ions, Mo XV (Ni-like), Mo XVI (Co-like), Mo XXXII (Na-like), and to a lesser extent Mo XXXI (Mg-like) and Mo XVII (Fe-like), have been achieved by comparison with ab initio calculations. A general interpretation of intermediate ion stages is also given but it is shown that most of these spectra are so complex, as a result of inner-subshell excitation, that detailed term-scheme analyses are nearly impossible. (author)

  8. Graphics of diffraction spectra for PC

    International Nuclear Information System (INIS)

    Macias B, L.R.

    1991-09-01

    The materials can be studied by means of diffraction if these are crystalline; of the type of study will depend the technique to apply, the first step is the obtaining of a digital register that allows to build the corresponding spectra. The digital register should have well-known the initial and final angular data. The main objective of this work, is starting of a digital register of data or an arrangement CPSi type (counts per second measured by the detection system) generated by means of the diffractometer, to create the graph of the corresponding spectra in visual form in the screen of a microcomputer and if is required, to obtain the graph in printed form by means of the same computer program for microcomputer. (Author)

  9. Hadronic spectra from collisions of heavy nuclei

    International Nuclear Information System (INIS)

    Jacobs, P.

    1997-03-01

    Hadronic spectra from collisions of heavy ions at ultrarelativistic energies are discussed, concentrating on recent measurements at the SPS of central Pb+Pb collisions at 158 GeV/nucleon, which are compared to collisions of lighter ions and at lower beam energies. Baryon stopping is seen to be larger for heavier systems and lower energies. Total yields of pions and kaons scale with the number of participants in central collisions at the SPS; in particular, the K/π ratio is constant between central S+S and Pb+Pb at the SPS. Transverse mass spectra indicate significantly larger radial flow for the heavier systems. At midrapidity, an enhancement of - >/ + > and - >/ + > at low P T are best explained by final state Coulomb interaction with the residual charge of the fireball

  10. Absorption spectra of AA-stacked graphite

    International Nuclear Information System (INIS)

    Chiu, C W; Lee, S H; Chen, S C; Lin, M F; Shyu, F L

    2010-01-01

    AA-stacked graphite shows strong anisotropy in geometric structures and velocity matrix elements. However, the absorption spectra are isotropic for the polarization vector on the graphene plane. The spectra exhibit one prominent plateau at middle energy and one shoulder structure at lower energy. These structures directly reflect the unique geometric and band structures and provide sufficient information for experimental fitting of the intralayer and interlayer atomic interactions. On the other hand, monolayer graphene shows a sharp absorption peak but no shoulder structure; AA-stacked bilayer graphene has two absorption peaks at middle energy and abruptly vanishes at lower energy. Furthermore, the isotropic features are expected to exist in other graphene-related systems. The calculated results and the predicted atomic interactions could be verified by optical measurements.

  11. XUV spectra of highly ionised molybdenum

    Energy Technology Data Exchange (ETDEWEB)

    Mansfield, M W.D.; Peacock, N J; Smith, C C; Hobby, M G [UKAEA, Abingdon. Culham Lab.; Cowan, R D

    1978-05-14

    The spectra of molybdenum ions produced in Tokamaks in the wavelength range 10-200 A have been reproduced in a plasma formed by laser beam irradiation of solid molybdenum targets. Lines from highly ionised stages of molybdenum (Mo XXX to Mo XXXII) have been distinguished by varying the laser beam intensity. Detailed analyses of the simpler ions, Mo XV (Ni-like), Mo XVI (Co-like), Mo XXXII (Na-like), and to a lesser extent Mo XXXI (Mg-like) and Mo XVII (Fe-like), have been achieved by comparison with ab initio calculations. A general interpretation of intermediate ion stages is also given but it is shown that most of these spectra are so complex, as a result of inner-subshell excitation, that detailed term-scheme analyses are nearly impossible.

  12. Digital dynamic amplitude-frequency spectra analyzer

    International Nuclear Information System (INIS)

    Kalinnikov, V.A.; )

    2006-01-01

    The spectra analyzer is intended for the dynamic spectral analysis of signals physical installations and noise filtering. The recurrence Fourier transformation algorithm is used in the digital dynamic analyzer. It is realized on the basis of the fast logic FPGA matrix and the special signal ADSP microprocessor. The discretization frequency is 2 kHz-10 MHz. The number of calculated spectral coefficients is not less 512. The functional fast-action is 20 ns [ru

  13. Fourier evaluation of broad Moessbauer spectra

    International Nuclear Information System (INIS)

    Vincze, I.

    1981-01-01

    It is shown by the Fourier analysis of broad Moessbauer spectra that the even part of the distribution of the dominant hyperfine interaction (hyperfine field or quadrupole splitting) can be obtained directly without using least-square fitting procedures. Also the odd part of this distribution correlated with other hyperfine parameters (e.g. isomer shift) can be directly determined. Examples for amorphous magnetic and paramagnetic iron-based alloys are presented. (author)

  14. Fourier evaluation of broad Moessbauer spectra

    International Nuclear Information System (INIS)

    Vincze, I.

    1981-09-01

    It is shown by the Fourier analysis of broad Moessbauer spectra that the even part of the distribution of the dominant hyperfine interaction (hyperfine field or quadrupole splitting) can be obtained directly without using least-square fitting procedures. Also the odd part of this distribution correlated with other hyperfine parameters (e.g. isomer shift) can be directly determined. Examples covering the case of amorphous magnetic and paramagnetic iron-based alloys are presented. (author)

  15. Ghost lines in Moessbauer relaxation spectra

    International Nuclear Information System (INIS)

    Price, D.C.

    1985-01-01

    The appearance in Moessbauer relaxation spectra of 'ghost' lines, which are narrow lines that do not correspond to transitions between real hyperfine energy levels of the resonant system, is examined. It is shown that in many cases of interest, the appearance of these 'ghost' lines can be interpreted in terms of the relaxational averaging of one or more of the static interactions of the ion. (orig.)

  16. Automation of the Analysis of Moessbauer Spectra

    International Nuclear Information System (INIS)

    Souza, Paulo A. de Jr.; Garg, R.; Garg, V. K.

    1998-01-01

    In the present report we propose the automation of least square fitting of Moessbauer spectra, the identification of the substance, its crystal structure and the access to the references with the help of a genetic algorith, Fuzzy logic, and the artificial neural network associated with a databank of Moessbauer parameters and references. This system could be useful for specialists and non-specialists, in industry as well as in research laboratories

  17. GRETEL, Ge(Li) Gamma Spectra Unfolding

    International Nuclear Information System (INIS)

    1975-01-01

    1 - Nature of physical problem solved: The program performs the quantitative analysis of gamma-ray spectra obtained by Ge(Li) detectors, using special libraries which are prepared for each particular problem. 2 - Method of solution: The computer routines which detect and evaluate peak areas perform the following operations: - local smoothing of the spectrum; - first derivative of the smoothed spectrum, - peak location according to the change of sign of the first derivative; - computation of the net area of each peak found

  18. Electronic spectra of astrophysically interesting cations

    Energy Technology Data Exchange (ETDEWEB)

    Maier, John P., E-mail: j.p.maier@unibas.ch; Rice, Corey A., E-mail: j.p.maier@unibas.ch; Mazzotti, Fabio J., E-mail: j.p.maier@unibas.ch; Johnson, Anatoly, E-mail: j.p.maier@unibas.ch [Department of Chemistry, University of Basel, Klingelbergstr. 80, CH-4056 Basel (Switzerland)

    2015-01-22

    The electronic spectra of polyacetylene cations were recorded at 20K in the laboratory in an ion trap instrument. These can then be compared with diffuse interstellar band (DIB) absorptions. Examination of recently published data shows that the attribution of a weak DIB at ∼506.9 nm to diacetylene cation is not justified. Study of the higher excited electronic states of polyacetylene cations shows that their widths can still be sufficiently narrow for consideration as DIB carriers.

  19. Dynamical analysis of highly excited molecular spectra

    Energy Technology Data Exchange (ETDEWEB)

    Kellman, M.E. [Univ. of Oregon, Eugene (United States)

    1993-12-01

    The goal of this program is new methods for analysis of spectra and dynamics of highly excited vibrational states of molecules. In these systems, strong mode coupling and anharmonicity give rise to complicated classical dynamics, and make the simple normal modes analysis unsatisfactory. New methods of spectral analysis, pattern recognition, and assignment are sought using techniques of nonlinear dynamics including bifurcation theory, phase space classification, and quantization of phase space structures. The emphasis is chaotic systems and systems with many degrees of freedom.

  20. The Rovibronic Spectra of the Cyclopentadienyl Radical

    Science.gov (United States)

    Sharma, Ketan; Miller, Terry A.; Stanton, John F.; Nesbitt, David

    2017-06-01

    Cyclopentadienyl (Cp) radical has been subject to numerous studies for the greater part of half a century. Experimental work has involved photo-electron spectroscopy, laser induced fluorescence excitation and emission, infrared absorption spectroscopy, and recently rotationally resolved spectra in the CH stretch region taken at JILA. Even more theoretical works appear in the literature, but substantial advances in computation have occurred since their completion. Cp's highly symmetric (D_{5h}) structure and doubly degenerate electronic ground (˜{X}^2E_1^{''}), which is subject to linear Jahn-Teller distortion, have been a great motivation for work on it. We have commenced new computational work to obtain a broad understanding of the electronic, vibrational, and rotational, i.e. rovibronic, structure of the Cp radical as revealed by its spectra, with particular emphasis on the new infrared spectra. The goal is to guide experiments and their analyses and reconcile results from spectroscopy and quantum chemistry calculations. T. Ichino, et al. J. Chem. Phys. 129, 084310 (2008) L. Yu, S. C. Foster, J. M. Williamson, M. C. Heaven and T. A. Miller J. Phys. Chem. 92, 4263 (1988) B. E. Applegate, A. J. Bezant and T. A. Miller J. Chem. Phys 114, 4869 (2001) D. Leicht, M. Kaufmann, G. Schwaab, and M. Havenith J. Chem. Phys. 145, 7 (2016), 074304.

  1. MAGNETIC ENERGY SPECTRA IN SOLAR ACTIVE REGIONS

    International Nuclear Information System (INIS)

    Abramenko, Valentyna; Yurchyshyn, Vasyl

    2010-01-01

    Line-of-sight magnetograms for 217 active regions (ARs) with different flare rates observed at the solar disk center from 1997 January until 2006 December are utilized to study the turbulence regime and its relationship to flare productivity. Data from the SOHO/MDI instrument recorded in the high-resolution mode and data from the BBSO magnetograph were used. The turbulence regime was probed via magnetic energy spectra and magnetic dissipation spectra. We found steeper energy spectra for ARs with higher flare productivity. We also report that both the power index, α, of the energy spectrum, E(k) ∼ k -α , and the total spectral energy, W = ∫E(k)dk, are comparably correlated with the flare index, A, of an AR. The correlations are found to be stronger than those found between the flare index and the total unsigned flux. The flare index for an AR can be estimated based on measurements of α and W as A = 10 b (αW) c , with b = -7.92 ± 0.58 and c = 1.85 ± 0.13. We found that the regime of the fully developed turbulence occurs in decaying ARs and in emerging ARs (at the very early stage of emergence). Well-developed ARs display underdeveloped turbulence with strong magnetic dissipation at all scales.

  2. VARIABILITY IN OPTICAL SPECTRA OF ε ORIONIS

    International Nuclear Information System (INIS)

    Thompson, Gregory B.; Morrison, Nancy D.

    2013-01-01

    We present the results of a time series analysis of 130 échelle spectra of ε Ori (B0 Ia), acquired over seven observing seasons between 1998 and 2006 at Ritter Observatory. The equivalent widths of Hα (net) and He I λ5876 were measured and radial velocities were obtained from the central absorption of He I λ5876. Temporal variance spectra (TVS) revealed significant wind variability in both Hα and He I λ5876. The He I TVS have a double-peaked profile consistent with radial velocity oscillations. A periodicity search was carried out on the equivalent width and radial velocity data, as well as on wavelength-binned spectra. This analysis has revealed several periods in the variability with timescales of two to seven days. Many of these periods exhibit sinusoidal modulation in the associated phase diagrams. Several of these periods were present in both Hα and He I, indicating a possible connection between the wind and the photosphere. Due to the harmonic nature of these periods, stellar pulsations may be the origin of some of the observed variability. Periods on the order of the rotational period were also detected in the He I line in the 1998-1999 season and in both lines during the 2004-2005 season. These periods may indicate rotational modulation due to structure in the wind.

  3. Secondary charged particle spectra and kerma calculations

    International Nuclear Information System (INIS)

    Coyne, J.J.; Gerstenberg, H.M.; Hennen, L.A.

    1985-01-01

    The calculation of kerma factors from known cross sections is not as simple as is often implied. The kerma factors are strongly influenced by the reaction mechanism assumed. An important example of this dependence on the reaction mechanism is the contribution of the 12 C(n,n')3α reaction to the total kerma in carbon. First, a short review will be given of the ENDF/B-V carbon cross sections which were used in the calculation of carbon kerma factors. Using the reaction channels implied in the ENDF/B-V evaluation, the contribution of various reactions to the total kerma factors in carbon will be given. A detailed analysis of the reaction mechanisms which could contribute to the (n,n')3α reaction in carbon has been carried out. First their contribution to kerma, independent of cross section, will be calculated and then the initial spectra of alpha particles produced by the various reaction mechanisms will be given. A discussion of possible ways of experimentally distinguishing the reaction mechanisms will be made by comparing their different initial spectra and their variation in kerma with neutron energy. Finally, the event-size spectra for tissue-equivalent proportional counters will be presented, giving only the contributions from the (n,n')3α reaction and its various possible reaction channels. 3 refs., 11 figs., 4 tabs

  4. Optical spectra analysis for breast cancer diagnostics

    Science.gov (United States)

    Belkov, S. A.; Kochemasov, G. G.; Lyubynskaya, T. E.; Maslov, N. V.; Nuzhny, A. S.; da Silva, L. B.; Rubenchik, A.

    2011-11-01

    Minimally invasive probe and optical biopsy system based on optical spectra recording and analysis seem to be a promising tool for early diagnostics of breast cancer. Light scattering and absorption spectra are generated continuously as far as the needle-like probe with one emitting and several collecting optical fibers penetrates through the tissues toward to the suspicious area. That allows analyzing not only the state of local site, but also the structure of tissues along the needle trace. The suggested method has the advantages of automated on-line diagnosing and minimal tissue destruction and in parallel with the conventional diagnostic procedures provides the ground for decision-making. 165 medical trials were completed in Nizhny Novgorod Regional Oncology Centre, Russia. Independent diagnoses were the results of fine biopsy and histology. Application of wavelet expansion and clasterization techniques for spectra analysis revealed several main spectral types for malignant and benign tumors. Automatic classification algorithm demonstrated specificity ˜90% and sensitivity ˜91%. Large amount of information, fuzziness in criteria and data noisiness make neural networks to be an attractive analytic tool. The model based on three-layer perceptron was tested over the sample of 29 `cancer' and 29 `non-cancer' cases and demonstrated total separation.

  5. Photon and photoneutron spectra produced in radiotherapy Linacs

    International Nuclear Information System (INIS)

    Vega C, H. R.; Martinez O, S. A.; Benites R, J. L.; Lallena, A. M.

    2011-10-01

    A Monte Carlo calculation, using the MCNPX code, was carried out in order to estimate the photon and neutron spectra in two locations of two linacs operating at 15 and 18 MV. Detailed models of both linac heads were used in the calculations. Spectra were estimated below the flattening filter and at the isocenter. Neutron spectra show two components due to evaporation and knock-on neutrons. Lethargy spectra under the filter were compared to the spectra calculated from the function quoted by Tosi et al. that describes reasonably well neutron spectra beyond 1 MeV, though tends to underestimate the energy region between 10 -6 and 1 MeV. Neutron and Bremsstrahlung spectra show the same features regardless of the linac voltage. The amount of photons and neutrons produced by the 15 MV linac is smaller than that found for the 18 MV linac. As expected, Bremsstrahlung spectra ends according to the voltage used to accelerate the electrons. (Author)

  6. Time-of-flight neutron spectra measurements in Zenith

    Energy Technology Data Exchange (ETDEWEB)

    Barclay, F R; Coates, M S; Diment, K M; Durrani, S A; Gayther, D B; Poole, M J; Reed, D L

    1962-01-15

    Neutron spectra in the second core loading of ZENITH have been measured using a neutron chopper. Spectra at two positions in the reactore core were obtained over a range of temperatures extending to 650 deg C.

  7. Quantum synchrotron spectra from semirelativistic electrons in teragauss magnetic fields

    International Nuclear Information System (INIS)

    Brainerd, J.J.

    1987-01-01

    Synchrotron spectra are calculated from quantum electrodynamic transition rates for thermal and power-law electron distributions. It is shown that quantum effects appear in thermal spectra when the photon energy is greater than the electron temperature, and in power-law spectra when the electron energy in units of the electron rest mass times the magnetic field strength in units of the critical field strength is of order unity. These spectra are compared with spectra calculated from the ultrarelativistic approximation for synchrotron emission. It is found that the approximation for the power-law spectra is good, and the approximation for thermal spectra produces the shape of the spectrum accurately but fails to give the correct normalization. Single photon pair creation masks the quantum effects for power-law distributions, so only modifications to thermal spectra are important for gamma-ray bursts. 13 references

  8. Evaluation of secondary and prompt fission neutron spectra

    Energy Technology Data Exchange (ETDEWEB)

    Porodzinskij, Yu.V.; Sukhovitskij, E.Sh. [Radiation Physics and Chemistry Problems Inst., Minsk-Sosny (Belarus)

    1997-03-01

    A simple model allowing to split neutron emission spectra into reaction partials is suggested. Predicted spectra of (n,n`{gamma}), (n,n`f), etc appear to be much harder than usually evaluated. (author)

  9. Study on Moessbauer spectra of hemoglobin in thalassemia

    International Nuclear Information System (INIS)

    Guo Xuanhui; Zhao Nanming; Zhang Xiufang

    1988-01-01

    The 57 Fe Moessbauer spectra of erythrocytes in normal subjects and nine patients of different thalassemias were studied. Together with clinical analysis, the correlation between the components in the spectra and different types of anemias was discussed. (orig.)

  10. Study on Mössbauer spectra of hemoglobin in thalassemia

    Science.gov (United States)

    Xuanhui, Guo; Nanming, Zhao; Xiufang, Zhang; Naifei, Gao; Youwen, Huang; Rongxin, Wang

    1988-02-01

    The57Fe Mössbauer spectra of erythrocytes in normal subjects and nine patients of different thalassemias were studied. Together with clinical analysis, the correlation between the components in the spectra and different types of anemias was discussed.

  11. Photon and photoneutron spectra produced in radiotherapy Linacs

    Energy Technology Data Exchange (ETDEWEB)

    Vega C, H. R. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Calle Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico); Martinez O, S. A. [Universidad Pedagogica y Tecnologica de Colombia, Grupo de Fisica Nuclear Aplicada y Simulacion, Av. Central del Norte Km. 1, Via Paipa Tunja, Boyaca (Colombia); Benites R, J. L. [Universidad Autonoma de Nayarit, Postgrado CBAP, Carretera Tepic Compostela Km. 9, Xalisco, Nayarit (Mexico); Lallena, A. M., E-mail: fermineutron@yahoo.com [Universida de Granada, Departamento de Fisica Atomica, Molecular y Nuclear, E-18071 Granada (Spain)

    2011-10-15

    A Monte Carlo calculation, using the MCNPX code, was carried out in order to estimate the photon and neutron spectra in two locations of two linacs operating at 15 and 18 MV. Detailed models of both linac heads were used in the calculations. Spectra were estimated below the flattening filter and at the isocenter. Neutron spectra show two components due to evaporation and knock-on neutrons. Lethargy spectra under the filter were compared to the spectra calculated from the function quoted by Tosi et al. that describes reasonably well neutron spectra beyond 1 MeV, though tends to underestimate the energy region between 10{sup -6} and 1 MeV. Neutron and Bremsstrahlung spectra show the same features regardless of the linac voltage. The amount of photons and neutrons produced by the 15 MV linac is smaller than that found for the 18 MV linac. As expected, Bremsstrahlung spectra ends according to the voltage used to accelerate the electrons. (Author)

  12. Theoretical microcontact spectra of metal electron-phonon coupling

    International Nuclear Information System (INIS)

    Kulagina, T.N.; Zhernov, A.P.

    1987-01-01

    Theoretical and experimental microcontact spectra of simple and certain transition metals are discussed. The Eliashberg thermodynamic functions for the metals are considered, as well as correlations between spectra peculiarities and parameters of metals and microbridge models

  13. Development of site specific response spectra

    International Nuclear Information System (INIS)

    Bernreuter, D.L.; Chen, J.C.; Savy, J.B.

    1987-03-01

    For a number of years the US Nuclear Regulatory Commission (NRC) has employed site specific spectra (SSSP) in their evaluation of the adequacy of the Safe Shutdown Earthquake (SSE). These spectra were developed only from the spectra of the horizontal components of the ground motion and from a very limited data set. As the data set has considerably increased for Eastern North America (ENA) and as more relevant data has become available from earthquakes occurring in other parts of the world (e.g., Italy), together with the fact that recent data indicated the importance of the vertical component, it became clear that an update of the SSSP's for ENA was desirable. The methodology used in this study is similar to the previous ones in that it used actual earthquake ground motion data with magnitudes within a certain range and recorded at distances and at sites similar to those that would be chosen for the definition of an SSE. An extensive analysis of the origin and size of the uncertainty is an important part of this study. The results of this analysis of the uncertainties is used to develop criteria for selecting the earthquake records to be used in the derivation of the SSSP's. We concluded that the SSSPs were not very sensitive to the distribution of the source to site distance of the earthquake records used in the analysis. That is, the variability (uncertainty) introduced by the range of distances was relatively small compared to the variability introduced by other factors. We also concluded that the SSSP are somewhat sensitive to the distribution of the magnitudes of these earthquakes, particularly at rock sites and, by inference, at shallow soil sites. We found that one important criterion in selecting records to generate SSSP is the depth of soil at the site

  14. Characterizing Sky Spectra Using SDSS BOSS Data

    Science.gov (United States)

    Florez, Lina Maria; Strauss, Michael A.

    2018-01-01

    In the optical/near-infrared spectra gathered by a ground-based telescope observing very faint sources, the strengths of the emission lines due to the Earth’s atmosphere can be many times larger than the fluxes of the sources we are interested in. Thus the limiting factor in faint-object spectroscopy is the degree to which systematics in the sky subtraction can be minimized. Longwards of 6000 Angstroms, the night-sky spectrum is dominated by multiple vibrational/rotational transitions of the OH radical from our upper atmosphere. While the wavelengths of these lines are the same in each sky spectrum, their relative strengths vary considerably as a function of time and position on the sky. The better we can model their strengths, the better we can hope to subtract them off. We expect that the strength of lines from common upper energy levels will be correlated with one another. We used flux-calibrated sky spectra from the Sloan Digital Sky Survey Baryon Oscillation Spectroscopic Survey (SDSS BOSS) to explore these correlations. Our aim is to use these correlations for creating improved sky subtraction algorithms for the Prime Focus Spectrograph (PFS) on the 8.2-meter Subaru Telescope. When PFS starts gathering data in 2019, it will be the most powerful multi-object spectrograph in the world. Since PFS will be gathering data on sources as faint as 24th magnitude and fainter, it's of upmost importance to be able to accurately measure and subtract sky spectra from the data that we receive.

  15. Prediction of peak overlap in NMR spectra

    International Nuclear Information System (INIS)

    Hefke, Frederik; Schmucki, Roland; Güntert, Peter

    2013-01-01

    Peak overlap is one of the major factors complicating the analysis of biomolecular NMR spectra. We present a general method for predicting the extent of peak overlap in multidimensional NMR spectra and its validation using both, experimental data sets and Monte Carlo simulation. The method is based on knowledge of the magnetization transfer pathways of the NMR experiments and chemical shift statistics from the Biological Magnetic Resonance Data Bank. Assuming a normal distribution with characteristic mean value and standard deviation for the chemical shift of each observable atom, an analytic expression was derived for the expected overlap probability of the cross peaks. The analytical approach was verified to agree with the average peak overlap in a large number of individual peak lists simulated using the same chemical shift statistics. The method was applied to eight proteins, including an intrinsically disordered one, for which the prediction results could be compared with the actual overlap based on the experimentally measured chemical shifts. The extent of overlap predicted using only statistical chemical shift information was in good agreement with the overlap that was observed when the measured shifts were used in the virtual spectrum, except for the intrinsically disordered protein. Since the spectral complexity of a protein NMR spectrum is a crucial factor for protein structure determination, analytical overlap prediction can be used to identify potentially difficult proteins before conducting NMR experiments. Overlap predictions can be tailored to particular classes of proteins by preparing statistics from corresponding protein databases. The method is also suitable for optimizing recording parameters and labeling schemes for NMR experiments and improving the reliability of automated spectra analysis and protein structure determination.

  16. Molecular geometry in the ultraviolet absorption spectra

    International Nuclear Information System (INIS)

    Albuquerque, S.F. de; Monteiro, L.S.; Adamis, L.M.B.; Baltar, M.C.P.; Silva, R.M. da

    1977-01-01

    The ultraviolet absorption spectra may be sensibly affected by steric effects. These effects can cause a lot of difficulties and unexpected changes in spectrum. The most general source of such difficulties is steric inhibition of resonance. In addition to this, ultraviolet epectra may be markedly changed by steric factors which change the positions of dipoles in the molecule with respect to each other and by the interaction of nonconjugated chromophores suitably located in space. We have studied in detail each of these effects presenting a lot of usual and importants examples in Organic Chemistry. Others relevants subjects were not considerated in this present work [pt

  17. Maximum entropy decomposition of quadrupole mass spectra

    International Nuclear Information System (INIS)

    Toussaint, U. von; Dose, V.; Golan, A.

    2004-01-01

    We present an information-theoretic method called generalized maximum entropy (GME) for decomposing mass spectra of gas mixtures from noisy measurements. In this GME approach to the noisy, underdetermined inverse problem, the joint entropies of concentration, cracking, and noise probabilities are maximized subject to the measured data. This provides a robust estimation for the unknown cracking patterns and the concentrations of the contributing molecules. The method is applied to mass spectroscopic data of hydrocarbons, and the estimates are compared with those received from a Bayesian approach. We show that the GME method is efficient and is computationally fast

  18. Spectra from foil-excited molybdenum ions

    International Nuclear Information System (INIS)

    Johnson, B.M.; Jones, K.W.; Cecchi, J.L.; Kruse, T.H.

    1978-01-01

    The extreme-ultraviolet spectra (5 to 55 nm) for foil-excited molybdenum ions have been measured using 22 to 200 MeV beams from the Brookhaven National Laboratory MP tandem Van de Graaff accelerator facility, 20 μg/cm 2 C stripping foils, and a grazing incidence spectrometer. The mean ion charge states (13 to 28) and the narrow distribution widths (about 2 charge states) were accurately predictable from experimental parameters. Where possible, comparisons are given with Mo radiation from tokamaks, vacuum sparks, and laser-excited plasmas

  19. Perturbative description of inclusive energy spectra

    Energy Technology Data Exchange (ETDEWEB)

    Lupia, S. [Max-Planck-Institut fuer Physik, Muenchen (Germany). Werner-Heisenberg-Institut

    1996-03-01

    The recent LEP-1.5 data of charged particle inclusive energy spectra are analyzed within the analytical QCD approach based on modified leading log approximation plus local parton hadron duality. The shape, the position of the maximum and the cumulant moments of the inclusive energy spectrum are well described within this model. The sensitivity of the results to the running of the coupling is pointed out. A scaling law for the one-particle invariant density E dn/d{sup 3}p at small momenta is observed, consistently with the predictions of colour coherence in soft gluon bremsstrahlung. (orig.).

  20. Perturbative description of inclusive energy spectra

    International Nuclear Information System (INIS)

    Lupia, S.

    1996-01-01

    The recent LEP-1.5 data of charged particle inclusive energy spectra are analyzed within the analytical QCD approach based on modified leading log approximation plus local parton hadron duality. The shape, the position of the maximum and the cumulant moments of the inclusive energy spectrum are well described within this model. The sensitivity of the results to the running of the coupling is pointed out. A scaling law for the one-particle invariant density E dn/d 3 p at small momenta is observed, consistently with the predictions of colour coherence in soft gluon bremsstrahlung. (orig.)

  1. Process and apparatus for determining molecular spectra

    International Nuclear Information System (INIS)

    Boesl, U.; Neusser, H.J.; Schlag, E.W.

    1984-01-01

    A process for determining molecular spectra in unseparated mixtures, in particular unseparated isotopic mixtures, which comprises allowing said mixture to successively flow through a photoreactor which is irradiated by an adjustable-wavelength laser and then through a mass spectrometer wherein the concentration of particles of specified mass is determined by variation of the wavelength of the laser or variation of the mass setting of the mass spectrometer in such a manner that a two-dimensional spectrum results having the parameters of wavelength and mass

  2. Multifractal spectra in homogeneous shear flow

    Science.gov (United States)

    Deane, A. E.; Keefe, L. R.

    1988-01-01

    Employing numerical simulations of 3-D homogeneous shear flow, the associated multifractal spectra of the energy dissipation, scalar dissipation and vorticity fields were calculated. The results for (128) cubed simulations of this flow, and those obtained in recent experiments that analyzed 1- and 2-D intersections of atmospheric and laboratory flows, are in some agreement. A two-scale Cantor set model of the energy cascade process which describes the experimental results from 1-D intersections quite well, describes the 3-D results only marginally.

  3. Inelastic response spectra of simple degrading systems

    International Nuclear Information System (INIS)

    Andreaus, U.; Ceradini, G.; D'Asdia, P.; Gaudenzi, P.

    1985-01-01

    Ductility was first stated, for single-degree-of-freedom elastic-perfectly plastic systems as the ratio of maximum to yield displacements. An alternative approach, aimed to reduce design forces for ductile structures and based on the energy dissipated during earthquake allows to obtain more reliable ductility factors even when system restoring characteristics are affected by deterioration during loading history. Inelastic response of SDOF systems has been investigated under seimic excitation, assuming stable and degrading constitutive laws to model their structural behaviour. Energy spectra and ductility requirent diagrams are generated and compared with those of the corresponding elastic-perfectly plastic systems. (orig.)

  4. Beamstrahlung spectra in next generation linear colliders

    Energy Technology Data Exchange (ETDEWEB)

    Barklow, T.; Chen, P. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)); Kozanecki, W. (DAPNIA-SPP, CEN-Saclay (France))

    1992-04-01

    For the next generation of linear colliders, the energy loss due to beamstrahlung during the collision of the e{sup +}e{sup {minus}} beams is expected to substantially influence the effective center-of-mass energy distribution of the colliding particles. In this paper, we first derive analytical formulae for the electron and photon energy spectra under multiple beamstrahlung processes, and for the e{sup +}e{sup {minus}} and {gamma}{gamma} differential luminosities. We then apply our formulation to various classes of 500 GeV e{sup +}e{sup {minus}} linear collider designs currently under study.

  5. Exclusion Statistics in Conformal Field Theory Spectra

    International Nuclear Information System (INIS)

    Schoutens, K.

    1997-01-01

    We propose a new method for investigating the exclusion statistics of quasiparticles in conformal field theory (CFT) spectra. The method leads to one-particle distribution functions, which generalize the Fermi-Dirac distribution. For the simplest SU(n) invariant CFTs we find a generalization of Gentile parafermions, and we obtain new distributions for the simplest Z N -invariant CFTs. In special examples, our approach reproduces distributions based on 'fractional exclusion statistics' in the sense of Haldane. We comment on applications to fractional quantum Hall effect edge theories. copyright 1997 The American Physical Society

  6. Far-infrared spectra of acetanilide revisited

    Science.gov (United States)

    Spire, A.; Barthes, M.; Kellouai, H.; De Nunzio, G.

    2000-03-01

    A new investigation of the temperature dependence of the far-infrared spectra of acetanilide and some isotopomers is presented. Four absorption bands are considered at 31, 42, 64, and 80 cm-1, and no significant change of their integrated intensity is observed when reducing the temperature. The temperature induced frequency shift values and other properties of these bands are consistent with an assignment as anharmonic lattice phonons. These results rule out the assignment of the 64, 80, and 106 cm-1 bands as normal modes of the polaronic excitation, as previously suggested.

  7. SIMULATION OF PARTICLE SPECTRA AT RHIC

    International Nuclear Information System (INIS)

    KAHANA, D.E.; KAHANA, S.H.

    2001-01-01

    A purely hadronic simulation is performed of the recently reported data from PHOBOS at energies of √s = 56, 130 GeV using the relativistic heavy ion cascade LUCIFER which had previously given a good description of the NA49 inclusive spectra at √s = 17.2 GeV/A. The results compare well with these early measurements at RHIC and indeed successfully predict the increase in multiplicity now seen by PHOBOS and the other RHIC detectors at the nominal maximum energy of √s = 200 GeV/A, suggesting that evidence for quark-gluon matter remains elusive

  8. Boundary layer heights derived from velocity spectra

    Energy Technology Data Exchange (ETDEWEB)

    Hoejstrup, J.; Barthelmie, R.J. [Risoe National Lab., Roskilde (Denmark); Kaellstrand, B. [Univ. of Uppsala, Uppsala (Sweden)

    1997-10-01

    It is a well-known fact that the height of the mixed layer determines the size of the largest and most energetic eddies that can be observed in the unstable boundary layer, and consequently a peak can be observed in the power spectra of the along-wind velocity component at scales comparable to the mixed layer depth. We will now show how the mixed layer depth can be derived from the u-specta and the results will be compared with direct measurements using pibal and tethersonde measurements. (au)

  9. Photographic infrared spectra of symbiotic stars

    International Nuclear Information System (INIS)

    Andrillat, Y.; Houziaux, L.

    1982-01-01

    The authors have observed six symbiotic stars during the period 1962-1977 with a grating spectrograph attached to the newtonian focus of the 120-cm telescope at Observatoire de Haute Provence. The reciprocal dispersion is 230 A.mm -1 and the region 5800 to 8800 A has been covered using hypersensitized IN plates. The minimum equivalent width for an emission line to be seen is about 0.5 A. The spectra are displayed and the main spectral characteristics are reviewed briefly. (Auth.)

  10. The use of synthetic spectra to test the preparedness to evaluate and analyze complex gamma spectra

    International Nuclear Information System (INIS)

    Nikkinen, M

    2001-10-01

    This is the report of two exercises that were run under the NKS BOK-1.1 sub-project. In these exercises synthetic gamma spectra were developed to exercise the analysis of difficult spectra typically seen after a severe nuclear accident. The spectra were analyzed twice; first, participants were given short time to give results to resemble an actual emergency preparedness situation, then a longer period of time was allowed to tune the laboratory analysis results for quality assurance purposes. The exercise did prove that it is possible to move measurement data from one laboratory to another if second opinion of the analysis is needed. It was also felt that this kind of exercise would enhance the experience the laboratories have in analyzing accident data. Participants expressed the need for additional exercises of this type, this is inexpensive and an easy way to exercise quick emergency response situations not normally seen in daily laboratory routines. (au)

  11. Vibronic spectra of Gd3+ in metaphosphate glasses: Comparison with Raman and infrared spectra

    International Nuclear Information System (INIS)

    Hall, D.W.; Brawer, S.A.; Weber, M.J.

    1982-01-01

    Vibronic sidebands associated with the 6 P/sub 7/2/→ 8 S/sub 7/2/ transition of Gd 3+ -doped metaphosphate glasses are observed using line-narrowed fluorescence techniques. Glasses having metal cations of different mass and charge (La,Al,Mg,Ba) are examined. Vibronic spectra, which probe vibrations about the rare-earth element site, are compared with polarized Raman scattering data and the infrared dielectric constant obtained from near-normal reflectance measurements. Results indicate that in metaphosphate glasses vibronic selection rules are similar to HV (vertical height) Raman selection rules. The wavelengths and relative intensities of peaks in the high-frequency portion of the vibronic spectra change with respect to corresponding peaks in the Raman spectra when the mass and/or charge of Gd 3+ differs significantly from that of the metal cation

  12. Generate floor response spectra, Part 2: Response spectra for equipment-structure resonance

    International Nuclear Information System (INIS)

    Li, Bo; Jiang, Wei; Xie, Wei-Chau; Pandey, Mahesh D.

    2015-01-01

    Highlights: • The concept of tRS is proposed to deal with tuning of equipment and structures. • Established statistical approaches for estimating tRS corresponding to given GRS. • Derived a new modal combination rule from the theory of random vibration. • Developed efficient and accurate direct method for generating floor response spectra. - Abstract: When generating floor response spectra (FRS) using the direct spectra-to-spectra method developed in the companion paper, probability distribution of t-response spectrum (tRS), which deals with equipment-structure resonance or tuning, corresponding to a specified ground response spectrum (GRS) is required. In this paper, simulation results using a large number of horizontal and vertical ground motions are employed to establish statistical relationships between tRS and GRS. It is observed that the influence of site conditions on horizontal statistical relationships is negligible, whereas the effect of site conditions on vertical statistical relationships cannot be ignored. Considering the influence of site conditions, horizontal statistical relationship suitable for all site conditions and vertical statistical relationships suitable for hard sites and soft sites, respectively, are established. The horizontal and vertical statistical relationships are suitable to estimate tRS for design spectra in USNRC R.G. 1.60 and NUREG/CR-0098, Uniform Hazard Spectra (UHS) in Western North America (WNA), or any GRS falling inside the valid coverage of the statistical relationship. For UHS with significant high frequency spectral accelerations, such as UHS in Central and Eastern North America (CENA), an amplification ratio method is proposed to estimate tRS. Numerical examples demonstrate that the statistical relationships and the amplification ratio method are acceptable to estimate tRS for given GRS and to generate FRS using the direct method in different practical situations.

  13. Generate floor response spectra, Part 2: Response spectra for equipment-structure resonance

    Energy Technology Data Exchange (ETDEWEB)

    Li, Bo, E-mail: b68li@uwaterloo.ca; Jiang, Wei, E-mail: w46jiang@uwaterloo.ca; Xie, Wei-Chau, E-mail: xie@uwaterloo.ca; Pandey, Mahesh D., E-mail: mdpandey@uwaterloo.ca

    2015-11-15

    Highlights: • The concept of tRS is proposed to deal with tuning of equipment and structures. • Established statistical approaches for estimating tRS corresponding to given GRS. • Derived a new modal combination rule from the theory of random vibration. • Developed efficient and accurate direct method for generating floor response spectra. - Abstract: When generating floor response spectra (FRS) using the direct spectra-to-spectra method developed in the companion paper, probability distribution of t-response spectrum (tRS), which deals with equipment-structure resonance or tuning, corresponding to a specified ground response spectrum (GRS) is required. In this paper, simulation results using a large number of horizontal and vertical ground motions are employed to establish statistical relationships between tRS and GRS. It is observed that the influence of site conditions on horizontal statistical relationships is negligible, whereas the effect of site conditions on vertical statistical relationships cannot be ignored. Considering the influence of site conditions, horizontal statistical relationship suitable for all site conditions and vertical statistical relationships suitable for hard sites and soft sites, respectively, are established. The horizontal and vertical statistical relationships are suitable to estimate tRS for design spectra in USNRC R.G. 1.60 and NUREG/CR-0098, Uniform Hazard Spectra (UHS) in Western North America (WNA), or any GRS falling inside the valid coverage of the statistical relationship. For UHS with significant high frequency spectral accelerations, such as UHS in Central and Eastern North America (CENA), an amplification ratio method is proposed to estimate tRS. Numerical examples demonstrate that the statistical relationships and the amplification ratio method are acceptable to estimate tRS for given GRS and to generate FRS using the direct method in different practical situations.

  14. Comparison of fish-community size spectra based on length ...

    African Journals Online (AJOL)

    Estimates of fish-community size spectra are promising indicators of the impact of fishing on fish assemblages. Size spectra consist of logarithmic graphs of abundance plotted against fish body size. Size spectra may either be constructed from length frequency data or estimated from the mean sizes and abundances of the ...

  15. Pathological gambling and obsessive-compulsive disorder: towards a spectrum of disorders of volition Jogo patológico e transtorno obsessivo-compulsivo: rumo a um espectro de transtornos da volição

    Directory of Open Access Journals (Sweden)

    Hermano Tavares

    2007-06-01

    Full Text Available OBJECTIVE: Pathological gambling is proposed as a participant of an impulsive-compulsive spectrum related to obsessive-compulsive disorder. This study aims to contrast pathological gambling and obsessive-compulsive disorder regarding course, comorbidity, and personality, hence testing the validity of the impulsive-compulsive spectrum. METHOD: 40 pathological gambling and 40 obsessive-compulsive disorder subjects matched to 40 healthy volunteers according to gender, age, and education were assessed with the Temperament Personality Questionnaire and the Barratt Impulsiveness Scale. Psychiatric patients were also assessed for course and comorbidity data. RESULTS: Obsessive-compulsive disorder presented an earlier onset, but the full syndrome took longer to evolve. Pathological gambling had higher comorbidity with substance-related disorders, and obsessive-compulsive disorder higher comorbidity with somatoform disorders. Gamblers scored higher than controls on the sub-factors Impulsiveness, Extravagance, Disorderliness, and Fear of Uncertainty. Obsessive-compulsive patients scored higher than controls on Fear of Uncertai-nty. Impulsiveness, Extravagance, and Disorderliness significantly correlated with the Barratt Impulsiveness Scale total score, Fear of Uncertainty did not. DISCUSSION: The course and comorbidity profiles of pathological gambling resemble an addiction and differ from obsessive-compulsive disorder. Pathological gambling combines impulsive and compulsive traits. Impulsivity and compulsivity should be regarded as orthogonal constructs, and as drives implicated in volition aspects of behavioral syndromes.OBJETIVO: Propõe-se que o jogo patológico faça parte de um espectro impulsivo-compulsivo relacionado ao transtorno obsessivo-compulsivo. O presente estudo propõe-se a comparar o jogo patológico e o transtorno obsessivo-compulsivo em relação a curso, comorbidade e personalidade, a fim de testar a validade do espectro impulsivo

  16. SISTEMA DE PESAGEM EM MOVIMENTO – WIM: INSTALAÇÃO E CALIBRAÇÃO EM PISTA EXPERIMENTAL PARA MONITORAMENTO E CLASSIFICAÇÃO DO ESPECTRO DE CARGAS RODANTES DA BR-290/RS - FREEWAY

    Directory of Open Access Journals (Sweden)

    Lelio Brito

    2014-08-01

    Full Text Available O tráfego de veículos representa um dos importantes papéis no dimensionamento de pavimentos bem como no desempenho da sua vida útil. Métodos empíricos, como o atualmente vigente no Brasil, especificado pelo IPR-719 do DNIT consideram o tráfego de projeto a partir de um “eixo padrão rodoviário”, no qual as configurações e magnitudes de cargas de eixo são convertidas em um número equivalente de solicitações de carga padrão – hoje um eixo simples de rodas duplas (ESRD com 80kN, através de fatores de equivalência de carga. Métodos de dimensionamento mais atuais, como AASHTO 2002, caracterizam o trafego através de espectros de carga por eixo; para isto é necessário que sejam determinados os vários tipos de carregamentos e suas magnitudes para caracterização do tráfego rodante. O uso de sistema de pesagem em movimento, conhecidos como “Weigh-in-motion”, são equipamentos que permitem a determinação do peso dos eixos rodantes em vias em serviço a velocidade operacional da via; estes equipamentos associados a classificadores de tráfego, permitem a completa classificação do espectro de cargas nas rodovias. Este estudo investigou a sensibilidade de um sistema de pesagem em movimento através de sua implantação em uma pista experimental através do Simulador de Tráfego DAER/UFRGS na Universidade Federal do Rio Grande do Sul para avaliar a acurácia deste sistema e suas limitações com vistas à implantação posterior em uma via em serviço na BR-290/RS. Com os resultados obtidos foi possível estabelecer um protocolo de instalação e coleta de dados para futura instalação em campo e verificar a sensibilidade dos sistemas em condições características do estado. Os resultados mostraram uma variação de até 57% nas leituras de carga para variação uma variação de 17°C na temperatura do pavimento e também sensibilidade da carga em função do posicionamento do rodado na seção transversal do

  17. Espectro polínico de mel de tiúba (Melipona fasciculata Smith, 1854, Hymenoptera, Apidae Pollen spectrum of honey of "tiúba" (Melipona fasciculata Smith, 1854, Hymenoptera, Apidae

    Directory of Open Access Journals (Sweden)

    Adriana Cecília Lima Martins

    2011-01-01

    Full Text Available O espectro polínico do mel de Melipona fasciculata Smith foi analisado com o objetivo de identificar os recursos nectaríferos utilizados por essa espécie. A identificação das plantas visitadas foi realizada com base na análise dos tipos polínicos encontrados em 12 amostras de mel coletadas, mensalmente, em uma colônia localizada no município de Palmeirândia, na área da Baixada Ocidental Maranhense (02º40'47,6S, 44º52'39,8"W, Brasil. As análises quantitativas e qualitativas foram realizadas com o objetivo de determinar as porcentagens e classes de frequência dos tipos polínicos presentes nas amostras de mel. Foram encontrados 45 tipos polínicos, sendo Pontederia parviflora Alexander (Pontederiaceae, espécie mais frequente em todo o período de amostragem (38,6%, pólen dominante em Outubro (86%, Junho (85%, Julho (76%, Agosto (49% e Setembro (51% e pólen acessório em Dezembro, Janeiro e Março. Mimosa caesalpiniifolia Benth (Mimosaceae foi a segunda espécie mais frequente (22,8% sendo pólen dominante em Novembro (46%, Abril (74% e Maio (72%. Myrcia eximia DC (Myrtaceae foi considerada pólen isolado importante. As famílias mais representativas no espectro polínico das amostras de mel foram Pontederiaceae e Mimosaceae. 50% dos méis foram biflorais, havendo também méis monoflorais (41,7% e heteroflorais (8,3%.The pollen spectrum of honey of the Melipona fasciculata was analyzed aiming to elucidate the nectariferous resources used by this species. The identification of the visited plants was based upon the analysis of the pollen spectrum of 12 honey samples collected in one meliponarium located in Palmeirândia county, lowland area of Maranhão State, Brazil (02º40'47,6S, 44º52'39,8"W. The quantitative and qualitative analysis of honey samples was conducted in order to determine the pollen type percentages and frequency classes. Forty-five pollen types were found, being Pontederia parviflora Alexander (Pontederiaceae the

  18. Adaptação sócio-comunicativa no espectro autístico: dados obtidos com pais e terapeutas Social communicative adaptation in the autistic spectrum: data provided by parents and therapists

    Directory of Open Access Journals (Sweden)

    Priscilla Faria Sousa-Morato

    2009-01-01

    Full Text Available OBJETIVO: Verificar a efetividade da aplicação do protocolo de adaptação sócio-comunicativa a diferentes fontes de informação, neste caso, pais e terapeutas, na identificação de diferenças individuais em crianças com Distúrbios do Espectro Autístico. MÉTODOS: Participaram deste estudo 48 crianças, entre três anos e 11 anos e dez meses de idade, com diagnóstico clínico incluído no espectro autístico. Foram também sujeitos deste trabalho, 46 mães e dois pais, bem como 15 terapeutas, responsáveis legais e pelo atendimento fonoaudiológico especializado, respectivamente, das mesmas crianças, por um período mínimo de aproximadamente 12 meses, sendo que estes participaram respondendo a um questionário sobre o relacionamento social das crianças, sujeitos deste estudo. RESULTADOS: Genericamente, pode-se dizer que as respostas sobre a adaptação sócio-comunicativa, obtidas por meio de diferentes fontes de informação, ou seja, pais e terapeutas foram semelhantes. Entretanto, analisando os dados brutos observa-se que os pais apresentaram consistentemente um número maior de respostas positivas do que as terapeutas, para as questões relativas ao desempenho social. CONCLUSÃO: O estabelecimento de dados de adaptação sócio-comunicativa pode caracterizar esta população, demonstrando que este instrumento pode ser aplicado a diferentes informantes; as respostas dadas pelos mesmos foram homogêneas, reforçando a fidedignidade dos dados, apesar de existirem diferenças significativas na comparação entre os níveis e estágios sócio-comunicativos. A aplicação do questionário e protocolo de adaptação sócio-comunicativa a diferentes informantes pode fornecer um resultado bastante homogêneo, sendo possível realizar de forma fidedigna a caracterização das habilidades de relacionamento social dessas crianças.PURPOSE: To verify if the application of the social-communicative adaptation protocol with different

  19. Automated element identification for EDS spectra evaluation using quantification and integrated spectra simulation approaches

    International Nuclear Information System (INIS)

    Eggert, F

    2010-01-01

    This work describes first real automated solution for qualitative evaluation of EDS spectra in X-ray microanalysis. It uses a combination of integrated standardless quantitative evaluation, computation of analytical errors to a final uncertainty, and parts of recently developed simulation approaches. Multiple spectra reconstruction assessments and peak searches of the residual spectrum are powerful enough to solve the qualitative analytical question automatically for totally unknown specimens. The integrated quantitative assessment is useful to improve the confidence of the qualitative analysis. Therefore, the qualitative element analysis becomes a part of integrated quantitative spectrum evaluation, where the quantitative results are used to iteratively refine element decisions, spectrum deconvolution, and simulation steps.

  20. Mapping SOC in a river catchment by integrating laboratory spectra wavelength with remote sensing spectra

    DEFF Research Database (Denmark)

    Peng, Yi; Xiong, Xiong; Knadel, Maria

    There is potential to use soil ·-proximal and remote sensing derived spectra concomitantly to develop soil organic carbon (SOC) models. Yet mixing spectral data from different sources and technologies to improve soil models is still in its infancy. The objective of this study was to incorporate...... soil spectral features indicative of SOC from laboratory visible near-infrared reflectance (vis-NlR) spectra and incorporate them with remote sensing (RS) images to improve predictions of top SOC in the Skjem river catchment, Denmark. The secondary objective was to improve prediction results...

  1. Estimación de variables biofísicas del pastizal en un ecosistema de dehesa a partir de espectro-radiometría de campo e imágenes hiperespectrales aeroportadas

    Directory of Open Access Journals (Sweden)

    J. R. Melendo-Vega

    2017-06-01

    Full Text Available Este trabajo aborda la estimación de variables biofísicas de un pastizal de dehesa a partir de información óptica generada por sensores próximos y remotos. Las variables de contenido de humedad del combustible (FMC, contenido de agua del dosel (CWC, índice de área foliar (LAI, materia seca (Cm y biomasa superficial (AGB fueron estimadas en laboratorio a partir de muestras de vegetación tomadas simultáneamente a la adquisición de datos hiperespectrales del sensor Compact Airbone Spectrographic Imager (CASI y del espectro-radiómetro de campo ASD FieldSpec® 3. A partir de la información espectral se han calculado diversos índices extraídos de la literatura y se han analizado las relaciones lineales existentes con las variables biofísicas medidas en campo. Los resultados muestran relaciones consistentes entre las variables biofísicas y los índices espectrales, especialmente en el caso de los índices basados en bandas del infrarrojo medio de onda corta (SWIR y del red-edge, poniendo de manifiesto la importancia de estas regiones en la estimación de variables biofísicas en cubiertas de pastizal. Se han obteniendo coeficientes de determinación (R2 superiores a 0,91 y un error cuadrático medio relativo (RRMSE de 21,4%, para los índices espectrales calculados con datos ASD; y R2 de 0,91 y RRMSE de 15,5% para los índices espectrales calculados con datos CASI. .

  2. O modelo atômico de Bohr e as suas limitações na interpretação do espectro do átomo de hélio

    Directory of Open Access Journals (Sweden)

    Danielle Nicolodelli Tenfen

    2017-05-01

    Full Text Available A inserção de tópicos de física moderna e contemporânea na Educação Básica já não é mais algo tão distante. Os livros didáticos aprovados no último Plano Nacional contemplam, de formas distintas, discussões a esse respeito. Porém, sabe-se que a efetiva implementação desses conteúdos em sala de aula depende da formação – tanto conceitual quanto pedagógica – dos professores. Nesse sentido, o presente artigo visa contribuir com professores e estudantes de graduação em Física, apresentando um breve delineamento histórico que enfatiza o contexto de surgimento do modelo atômico de Niels Bohr, conhecido por situar-se em um período de transição entre Física Clássica e Moderna. Ainda, mostram-se detalhadamente as limitações do modelo de Bohr, evidenciando a necessidade das explicações oriundas da nova Mecânica Quântica para uma descrição adequada do espectro do átomo de hélio. Por fim, apresenta-se uma proposta experimental que consiste na construção de um espectroscópio de baixo custo e problematizam-se alguns dados coletados a partir desse aparato.

  3. A tecnologia assistiva scala como recurso para produção de narrativas e registro de dados nas pesquisas em educação: uma experiência com pessoas adultas com transtorno do espectro autista

    Directory of Open Access Journals (Sweden)

    Ivanise Gomes de Souza Bittencourt

    2017-08-01

    Full Text Available O presente artigo tem por objetivo apresentar o Sistema de Comunicação Alternativa para Letramento de Pessoas com Autismo (SCALA enquanto recurso de produção de narrativas e registro de dados nas pesquisas em educação. Essa tecnologia assistiva foi desenvolvida em 2009 por pesquisadores da Universidade Federal do Rio Grande do Sul (UFRGS e nos anos subsequentes adquiriu novas versões, acrescentando um módulo de narrativas visuais para a construção de histórias nas plataformas web e android/tablet. Através do módulo de narrativas visuais é possível que participantes de pesquisas, principalmente com déficits de comunicação, construam histórias relacionadas a diversos objetos de estudos de pesquisa em educação. Esse estudo foi desenvolvido, entre os meses de abril e maio de 2016, com quatro participantes com Transtorno do Espectro Autista (TEA, com idades entre 30 e 36 anos, sendo uma do sexo feminino e três do sexo masculino. Os resultados evidenciaram o SCALA como uma ferramenta relevante de investigação em educação, especialmente na realização de pesquisas envolvendo alunos com TEA, pois permitiu conhecer as percepções dos participantes quanto aos professores, escola e amigos, seus interesses e dificuldades, experiências positivas e negativas e sentimentos quanto à interrupção do processo de escolarização.

  4. Uso de antimicrobianos de amplio espectro en un hospital pediátrico de Santiago de Cuba Use of wide spectrum antimicrobials in a children hospital from Santiago de Cuba

    Directory of Open Access Journals (Sweden)

    Erlis Mengana López

    2012-09-01

    Full Text Available Se realizó un estudio descriptivo y transversal de los 1 311 pacientes que recibieron antimicrobianos de amplio espectro en el Hospital Infantil Norte Docente "Dr. Juan de la Cruz Martínez Maceira" de Santiago de Cuba, desde enero hasta diciembre de 2009, a fin de analizar el uso de estos medicamentos, para lo cual se revisaron las historias clínicas correspondientes y los controles del Departamento de Farmacia. En la casuística predominaron la ceftriaxona como medicamento más empleado (64,8 %, la Unidad de Cuidados Intensivos como el servicio que más lo utilizó (41,7 %, la neumonía bacteriana como entidad clínica más común (42,0 % y la evolución favorable de los afectados (98,5 %.A descriptive and cross-sectional study of the 1 311 patients who received wide spectrum antimicrobials in "Dr. Juan de la Cruz Martínez Maceira" Teaching Northern Children Hospital in Santiago de Cuba was carried out from January to December, 2009, in order to analyze the use of these drugs. For this aim, the corresponding medical records and the controls of the Pharmacy Department were reviewed. Ceftriaxone as the most used medication (64.8 %, the Intensive Care Unit as the most used service (41.7 %, the bacterial pneumonia as the most common clinical entity (42.0 % and the favorable clinical course of those affected (98.5 % prevailed in the case material.

  5. As Contribuições do Uso da Comunicação Alternativa no Processo de Inclusão Escolar de um Aluno com Transtorno do Espectro do Autismo

    Directory of Open Access Journals (Sweden)

    Cláudia Miharu TOGASHI

    Full Text Available RESUMO: o presente estudo é a continuidade de uma pesquisa maior, cujo objetivo foi implementar um programa de capacitação oferecido a professores da rede municipal do RJ, atuando no Atendimento Educacional Especializado (AEE para introduzir o uso do sistema PECS-Adaptado junto aos alunos com Transtorno do Espectro do Autismo (TEA. Ao término da pesquisa, surgiram questionamentos, dando origem a esta investigação, que foi dividida em dois estudos: primeiro foi o follow-up da pesquisa maior e teve como objetivo verificar a eficácia e continuidade do uso do PECS-Adaptado pela professora do AEE com seu aluno com TEA. Foi realizado em uma sala de recursos no município do RJ e participaram da pesquisa a professora e o aluno com TEA. Ocorreram sete sessões, que foram analisadas a partir de um protocolo de registro dos níveis de apoio oferecido nas fases do PECS-Adaptado. Os resultados sinalizaram continuidade no uso do sistema pela professora. O Estudo II objetivou analisar as interações comunicativas do mesmo aluno do estudo I com uma professora e uma estagiária em ambiente de sala de aula regular. Foram realizadas 10 sessões de observação e intervenção quanto aos atos comunicativos e estes foram categorizados e dispostos em quadros para melhor visualização. Os resultados mostraram maior interação comunicativa do aluno com a estagiária na fase de intervenção, além de generalizar o uso do PECS-Adaptado na sala de aula regular. Concluiu-se que a comunicação é um dos fatores fundamentais para que a inclusão escolar de um aluno com TEA ocorra de forma mais efetiva.

  6. On statistical fluctuations in the dibaryon spectra

    International Nuclear Information System (INIS)

    Bazhanskij, I.I.; Luk'yanov, V.K.; Reznik, B.L.; Titov, A.I.

    1988-01-01

    The aim of this report is to show, that idea about statistical nature of dibaryon resonances corresponds to the present experimental data. Condition for cross section fluctuation occurrence is linked with value of decay width for isolated dibaryon in nucleon channel. Γ in terms of dibaryon potential quark model and q 6 → NN dibaryon decay for q 6 state with S 6 orbital symmetry and (S=I, I=0) deuteron quantum numbers are calculated as an example. np → ppπ - , dp → ppn and elastic pp-scattering are considered and distributions of cross sections and correlation functions obtained from these reactions are presented to investigate cross section fluctuations in spectra of effective masses of two-nucleon systems. Supposition about fluctuation pattern does not contradict the experiment. Curves, calculated with x l α < or approx. 0.05 partial amplitude parameter and full width of Γ < or approx. 20 MeV dibaryon resonances comply to the present experiment best. Fluctuation peculiarities -peaks in cross sections have approximately the same energy width (Γ ∼ 15-20 MeV) as the observed narrow peak in effective mass spectra of some reactions. 16 refs.; 3 figs

  7. [Fluorescence spectra analysis of the scrophularia soup].

    Science.gov (United States)

    Yan, Li-hua; Song, Feng; Han, Juan; Su, Jing; Qu, Fei-fei; Song, Yi-zhan; Hu, Bo-lin; Tian, Jian-guo

    2008-08-01

    The cold-water and boiled-water soaked scrophularia soups have been prepared. The emission and excitation spectra of each scrophularia soup under different conditions have been measured at room temperature. The pH values of the different scrophularia soups have been also detected. There are obvious differences between the cold-water soaked scrophularia soup and the boiled-water soaked scrophularia. For both soups the emission wavelength increases with the wavelength of the excitation, but the peaks of the emission spectra for cold-water and boiled-water soaked scrophularia soup are different, which are 441 and 532 nm, respectively. Excitation spectrum has double peaks in the cold-water soaked scrophularia soup while only one peak with longer wavelength in the boiled-water soaked one. The pH value changes from 5.5 to 4.1. According to the organic admixture fluorescence mechanism we analyzed the reasons of the experimental results. Through heating, the interaction in different fluorescence molecular and the energy transfer process in the same fluorescence molecular become more active, and the conjugate structures and the generation of hydrogen bonds, increase. The fluorescence measurement is of value for the scrophularia pharmacology analysis and provides an analytical method for the quality identification of scrophularia soup.

  8. Primordial spectra from sudden turning trajectory

    Science.gov (United States)

    Noumi, Toshifumi; Yamaguchi, Masahide

    2013-12-01

    Effects of heavy fields on primordial spectra of curvature perturbations are discussed in inflationary models with a sudden turning trajectory. When heavy fields are excited after the sudden turn and oscillate around the bottom of the potential, the following two effects are generically induced: deformation of the inflationary background spacetime and conversion interactions between adiabatic and isocurvature perturbations, both of which can affect the primordial density perturbations. In this paper, we calculate primordial spectra in inflationary models with sudden turning potentials taking into account both of the two effects appropriately. We find that there are some non-trivial correlations between the two effects in the power spectrum and, as a consequence, the primordial scalar power spectrum has a peak around the scale exiting the horizon at the turn. Though both effects can induce parametric resonance amplifications, they are shown to be canceled out for the case with the canonical kinetic terms. The peak feature and the scale dependence of bispectra are also discussed.

  9. Interstellar dehydrogenated PAH anions: vibrational spectra

    Science.gov (United States)

    Buragohain, Mridusmita; Pathak, Amit; Sarre, Peter; Gour, Nand Kishor

    2018-03-01

    Interstellar polycyclic aromatic hydrocarbon (PAH) molecules exist in diverse forms depending on the local physical environment. Formation of ionized PAHs (anions and cations) is favourable in the extreme conditions of the interstellar medium (ISM). Besides in their pure form, PAHs are also likely to exist in substituted forms; for example, PAHs with functional groups, dehydrogenated PAHs etc. A dehydrogenated PAH molecule might subsequently form fullerenes in the ISM as a result of ongoing chemical processes. This work presents a density functional theory (DFT) calculation on dehydrogenated PAH anions to explore the infrared emission spectra of these molecules and discuss any possible contribution towards observed IR features in the ISM. The results suggest that dehydrogenated PAH anions might be significantly contributing to the 3.3 μm region. Spectroscopic features unique to dehydrogenated PAH anions are highlighted that may be used for their possible identification in the ISM. A comparison has also been made to see the size effect on spectra of these PAHs.

  10. Blind Source Separation For Ion Mobility Spectra

    International Nuclear Information System (INIS)

    Marco, S.; Pomareda, V.; Pardo, A.; Kessler, M.; Goebel, J.; Mueller, G.

    2009-01-01

    Miniaturization is a powerful trend for smart chemical instrumentation in a diversity of applications. It is know that miniaturization in IMS leads to a degradation of the system characteristics. For the present work, we are interested in signal processing solutions to mitigate limitations introduced by limited drift tube length that basically involve a loss of chemical selectivity. While blind source separation techniques (BSS) are popular in other domains, their application for smart chemical instrumentation is limited. However, in some conditions, basically linearity, BSS may fully recover the concentration time evolution and the pure spectra with few underlying hypothesis. This is extremely helpful in conditions where non-expected chemical interferents may appear, or unwanted perturbations may pollute the spectra. SIMPLISMA has been advocated by Harrington et al. in several papers. However, more modern methods of BSS for bilinear decomposition with the restriction of positiveness have appeared in the last decade. In order to explore and compare the performances of those methods a series of experiments were performed.

  11. Beta-energy averaging and beta spectra

    International Nuclear Information System (INIS)

    Stamatelatos, M.G.; England, T.R.

    1976-07-01

    A simple yet highly accurate method for approximately calculating spectrum-averaged beta energies and beta spectra for radioactive nuclei is presented. This method should prove useful for users who wish to obtain accurate answers without complicated calculations of Fermi functions, complex gamma functions, and time-consuming numerical integrations as required by the more exact theoretical expressions. Therefore, this method should be a good time-saving alternative for investigators who need to make calculations involving large numbers of nuclei (e.g., fission products) as well as for occasional users interested in restricted number of nuclides. The average beta-energy values calculated by this method differ from those calculated by ''exact'' methods by no more than 1 percent for nuclides with atomic numbers in the 20 to 100 range and which emit betas of energies up to approximately 8 MeV. These include all fission products and the actinides. The beta-energy spectra calculated by the present method are also of the same quality

  12. Spectra of γ rays feeding superdeformed bands

    International Nuclear Information System (INIS)

    Lauritsen, T.; Khoo, T.L.; Henry, R.G.

    1995-01-01

    The spectrum of γrays coincident with SD transitions contains the transitions which populate the SD band. This spectrum can provide information on the feeding mechanism and on the properties (moment of inertia, collectivity) of excited SD states. We used a model we developed to explain the feeding of SD bands, to calculate the spectrum of feeding γrays. The Monte Carlo simulations take into account the trigger conditions present in our Eurogam experiment. Both experimental and theoretical spectra contain a statistical component and a broad E2 peak (from transitions occurring between excited states in the SD well). There is good resemblance between the measured and calculated spectra although the calculated multiplicity of an E2 bump is low by ∼30%. Work is continuing to improve the quality of the fits, which will result in a better understanding of excited SD states. In addition, a model for the last steps, which cool the γ cascade into the SD yrast line, needs to be developed. A strong M1/E2 low-energy component, which we believe is responsible for this cooling, was observed

  13. Low resolution infrared spectra of quasars

    International Nuclear Information System (INIS)

    Soifer, B.T.; Neugebauer, G.; Oke, J.B.; Matthews, K.

    1980-01-01

    Low resolution spectra of a significant sample of quasars show that the Paschen α and Balmer line ratios do not agree with the radiative recombination case B result and vary widely within the quasars sampled. The range in Pα:Hβ ratios is a factor of approximately 6, while the range in Lyα:Hα ratios is a factor of approximately 5. For the Pα:Balmer series, the deviations from case B recombination are not consistent with reddening, but appear, within large dispersions, to be consistent with optical depth effects in the Balmer lines affecting the line ratios. The Lyα:Hα ratio is, however, correlated with the continuum spectral index, and can be explained as due to reddening affecting both the lines and continuum. Recent observational results based on a joint infrared/optical survey of the hydrogen line spectra of a significant number of the brightest low and high redshift quasars are summarised. This survey includes 12 quasars in the redshift range 0.07 1.5, where Hα and/or Hβ is redshifted into the 1.65μm or 2.2μm atmospheric windows. (Auth.)

  14. Continuous particle spectra and their angular distributions

    International Nuclear Information System (INIS)

    Sastry, Ch.V.; Jain, R.K.; Rama Rao, J.; Ernst, J.; Machner, H.

    1996-01-01

    The angular distribution of continuous particle spectra in pre-equilibrium reactions is still an unsolved problem, particularly so at forward angles. In the present work, the angular distributions of alpha particles emitted in (α, α',x) reactions in the target elements gold and rhodium have been studied in detail. Alpha particle beams of energy 60 MeV from the Variable Energy Cyclotron of Calcutta were used in these experiments. The theoretical calculations were done using an extended exciton model of Kalbach incorporated into the Computer Code PRECO-D2. The formalism used in the exciton model was modified to include division of pre equilibrium cross section into multi-step direct (MSD) and multi-step compound (MSC) components. These MSD and MSC cross sections were used to calculate the angular distributions in terms of Legendre polynomials whose coefficients are given by simple phenomenological relations. Even with a reasonable set of parameters, the agreement between theory and experiment was far from satisfactory at forward angles. Similar conclusion was also drawn in the case of continuous particle spectra of deuterons in (d, d'x) reactions at 25 MeV in various targets. (author). 10 refs., 2 figs

  15. Fourier transform spectra of quantum dots

    Science.gov (United States)

    Damian, V.; Ardelean, I.; Armăşelu, Anca; Apostol, D.

    2010-05-01

    Semiconductor quantum dots are nanometer-sized crystals with unique photochemical and photophysical properties that are not available from either isolated molecules or bulk solids. These nanocrystals absorb light over a very broad spectral range as compared to molecular fluorophores which have very narrow excitation spectra. High-quality QDs are proper to be use in different biological and medical applications (as fluorescent labels, the cancer treatment and the drug delivery). In this article, we discuss Fourier transform visible spectroscopy of commercial quantum dots. We reveal that QDs produced by Evident Technologies when are enlightened by laser or luminescent diode light provides a spectral shift of their fluorescence spectra correlated to exciting emission wavelengths, as shown by the ARCspectroNIR Fourier Transform Spectrometer. In the final part of this paper we show an important biological application of CdSe/ZnS core-shell ODs as microbial labeling both for pure cultures of cyanobacteria (Synechocystis PCC 6803) and for mixed cultures of phototrophic and heterotrophic microorganisms.

  16. Spectra of {gamma} rays feeding superdeformed bands

    Energy Technology Data Exchange (ETDEWEB)

    Lauritsen, T.; Khoo, T.L.; Henry, R.G. [and others

    1995-08-01

    The spectrum of {gamma}rays coincident with SD transitions contains the transitions which populate the SD band. This spectrum can provide information on the feeding mechanism and on the properties (moment of inertia, collectivity) of excited SD states. We used a model we developed to explain the feeding of SD bands, to calculate the spectrum of feeding {gamma}rays. The Monte Carlo simulations take into account the trigger conditions present in our Eurogam experiment. Both experimental and theoretical spectra contain a statistical component and a broad E2 peak (from transitions occurring between excited states in the SD well). There is good resemblance between the measured and calculated spectra although the calculated multiplicity of an E2 bump is low by {approximately}30%. Work is continuing to improve the quality of the fits, which will result in a better understanding of excited SD states. In addition, a model for the last steps, which cool the {gamma} cascade into the SD yrast line, needs to be developed. A strong M1/E2 low-energy component, which we believe is responsible for this cooling, was observed.

  17. Radio spectra of pulsars. Pt. 1

    International Nuclear Information System (INIS)

    Izekova, V.A.; Kuzmin, A.D.; Malofeev, V.M.; Shitov, Yu.P.

    1981-01-01

    The results of flux pulsar radioemission measurements at meter wavelength, made at Pushchino Radio Astronomical Observatory of the Lebedev Physical Institute, are presented. Flux densities at 102, 85, 61 and 39 MHz have been measured for 85, 29, 37 and 23 pulsars correspondingly. Some of them were performed at all frequencies simultaneously. On the basis of these data and high frequencies data obtained by other authors, spectra of 52 pulsars were plotted. In practically all investigated pulsars we have detected a turn-over frequency at which the flux density of pulsar radioemission attained its maximum. Its mean value is vsub(m) = 130 +- 80 MHz. Averaged on many pulsars, the spectral index is negative in the 39-61 MHz frequency range (anti ALPHA 39 sub(-) 61 = -1.4 +- 0.4) and passes through zero at frequencies of about 100 MHz, becoming positive in the 100-400 MHz frequency range. It was noticed that the spectral index in the 100-400 MHz interval depends upon such pulsar periods as α 100 sub(-) 400 = 0.7 log p + 0.9. Using the spectra, more precise radio luminosities of pulsars have been computed. (orig.)

  18. Vibration spectra of single atomic nanocontacts

    International Nuclear Information System (INIS)

    Bourahla, B; Khater, A; Rafil, O; Tigrine, R

    2006-01-01

    This paper introduces a simple model for an atomic nanocontact, where its mechanical properties are analysed by calculating numerically the local spectral properties at the contact atom and the nearby atoms. The standard methodology for calculating phonon spectral densities is extended to enable the calculation of localized contact modes and local density of states (DOS). The model system considered for the nanocontact consists of two sets of triple parallel semi-infinite atomic chains joined by a single atom in between. The matching method is used, in the harmonic approximation, to calculate the local Green's functions for the irreducible set of sites that constitute the inhomogeneous nanocontact domain. The Green's functions yield the vibration spectra and the DOS for the atomic sites. These are numerically calculated for different cases of elastic hardening and softening of the nanocontact domain. The purpose is to investigate how the local dynamics respond to local changes in the elastic environment. The analysis of the spectra and of the DOS identifies characteristic features and demonstrates the central role of a core subset of these sites for the dynamics of the nanocontact. The system models a situation which may be appropriate for contact atomic force microscopy

  19. Analysis of the FF Aqr spectra

    Science.gov (United States)

    Shimanskaya, N. N.; Bikmaev, I. F.; Shimansky, V. V.

    2011-07-01

    We determine the atmospheric parameters of the secondary in the close binary system FF Aqr and analyze its chemical composition. A series of high-resolution spectra are taken at different orbital phases using the coude echelle spectrometer of the 1.5-m Russian-Turkish Telescope (RTT150). We show that the absorption line intensity of heavy elements varies with phase due to the spotty nature of the cool component. We determine the abundances of heavy elements in the star's atmosphere by modelling the synthetic spectra and performing a differential analysis of the chemical composition of FF Aqr relative to the solar composition. Our analysis of the averaged spectrum of FF Aqr yielded 539 abundance estimates for 21 chemical elements. We found the metallicity of the star ([ Fe/H] = -0.11 ± 0.08) to be close solar, in agreement with the hypothesis that FF Aqr should belong to the Galactic disk. The inferred chemical composition of the objects exhibits no anomalous abundances of the α-, r-, and s-process elements like those earlier found in other systems (IN Com, LW Hya, V471 Tau). The lack of such anomalies in FF Aqr must be due to the fact that the elements heavier than 16 O cannot be synthesized in the core of the primary during the last stages of its evolution.

  20. Stellar parametrization from Gaia RVS spectra

    Science.gov (United States)

    Recio-Blanco, A.; de Laverny, P.; Allende Prieto, C.; Fustes, D.; Manteiga, M.; Arcay, B.; Bijaoui, A.; Dafonte, C.; Ordenovic, C.; Ordoñez Blanco, D.

    2016-01-01

    Context. Among the myriad of data collected by the ESA Gaia satellite, about 150 million spectra will be delivered by the Radial Velocity Spectrometer (RVS) for stars as faint as GRVS~ 16. A specific stellar parametrization will be performed on most of these RVS spectra, I.e. those with enough high signal-to-noise ratio (S/N), which should correspond to single stars that have a magnitude in the RVS band brighter than ~14.5. Some individual chemical abundances will also be estimated for the brightest targets. Aims: We describe the different parametrization codes that have been specifically developed or adapted for RVS spectra within the GSP-Spec working group of the analysis consortium. The tested codes are based on optimisation (FERRE and GAUGUIN), projection (MATISSE), or pattern-recognition methods (Artificial Neural Networks). We present and discuss each of their expected performances in the recovered stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity) for B- to K-type stars. The performances for determining of [α/Fe] ratios are also presented for cool stars. Methods: Each code has been homogeneously tested with a large grid of RVS simulated synthetic spectra of BAFGK-spectral types (dwarfs and giants), with metallicities varying from 10-2.5 to 10+ 0.5 the solar metallicity, and taking variations of ±0.4 dex in the composition of the α-elements into consideration. The tests were performed for S/N ranging from ten to 350. Results: For all the stellar types we considered, stars brighter than GRVS~ 12.5 are very efficiently parametrized by the GSP-Spec pipeline, including reliable estimations of [α/Fe]. Typical internal errors for FGK metal-rich and metal-intermediate stars are around 40 K in Teff, 0.10 dex in log(g), 0.04 dex in [M/H], and 0.03 dex in [α/Fe] at GRVS = 10.3. They degrade to 155 K in Teff, 0.15 dex in log(g), 0.10 dex in [M/H], and 0.1 dex in [α/Fe] at GRVS~ 12. Similar accuracies in Teff and [M/H] are

  1. Frequency Spectrum of Liquids and Cold Neutron Scattering; Spectre de frequences des liquides et diffusion de neutrons froids; Chastotnyj spektr zhidkostej i rasseyanie kholodnykh nejtronov; Espectro de frecuencias de los liquidos y dispersion de neutrones frios

    Energy Technology Data Exchange (ETDEWEB)

    Singwi, K S; Sjolander, A; Rahman, A [Argonne National Laboratory, Argonne, IL (United States)

    1963-01-15

    neutrons lents par les liquides comme l'ont souligne Egelstaff et ses colllaborateurs. Les auteurs calculent, a l'aide d'un modele stochastique, le spectre des frequences f({omega}) de la fonction d'auto-correlation des vitesses dans l'eau a 300{sup o}K et dans le plomb liquide a 620{sup o}K. Dans le cas de l'eau ils prevoient un maximum de la fonction f({omega}) correspondant a {Dirac_h} {omega}75{sup o}K. Dans le plomb, le maximum se manifeste a une valeur a peu pres analogue. II existe aussi un minimum de la fonction f({omega}) dans les deux cas. Larsson et Dahlborg ont observe un maximum de la fonction f({omega}) a la valeur d'{omega} prevue ci-dessus. Des observations faites recemment dans du plomb liquide par Cotter et al. confirment vraisemblablement les previsions des auteurs. (author) [Spanish] Una cuestion importante que se plantea respecto de la dispersion de neeutrones lentos por los liquidos es la siguiente: Existe un espectro de frecuencia de los liquidos analogo al de los solidos? para contestar a esta pregunta, basta demostrar que la funcion de amplitud {gamma}(t) de la funcion gaussiana de autocorrelacion espacio G{sup s}(r,t) puede expresarse, utilizando el espectro de frecuencias de la funcion de autocorreclation de velocidad, en form identica a la correspondiente a un solido armonico. Es decir, si se conoce el especro de frecuencias de la funcion de autocorrelacion de velocidad, se debe poder calcular la dispersion de neutrones lentos por los liquidos, como han senalado Egelstaff y colaboradores. Los autores calculan, utilizando un modelo estocastico de liquido, el espectro de frecuencia f({omega}) de la funcion de autocorrelacion de velocidad, en el caso del agua a 300{sup o}K y del plomo liquido a 620{sup o}K. Predicen para la primera un maximo de f({omega}) correspondiente a {Dirac_h}{omega} 75{sup o}K. Enel caso del plomo, el maximo se presenta tambien para el mismo valor de oj, aproximadamente. Ademas, en ambos casos f({omega})pasa por un minimo

  2. An experiment on multibubble sonoluminescence spectra in sodium chloride solution

    Institute of Scientific and Technical Information of China (English)

    CHEN Zhan; XU JunFeng; HUANG Wei; CHEN WeiZhong; MIAO GuoQing

    2008-01-01

    We investigated experimentally the spectra of MBSL in sodium chloride water solution with krypton as dissolved gas. We observed and compared the spectra of hydroxyl ion at 310 nm and that of sodium atom at 589 nm. It has been found that under the same experimental condition, the intensity of sodium atom spectra is obviously higher than that of the hydroxyl ion spectra, and is more sensitive to the experimental condition. The krypton content, the concentration of sodium chloride solution, and the driving sound pressure obviously affect the spectra intensity in certain range.

  3. Raman Spectra from Pesticides on the Surface of Fruits

    International Nuclear Information System (INIS)

    Zhang, P X; Zhou Xiaofang; Cheng, Andrew Y S; Fang Yan

    2006-01-01

    Raman spectra of several vegetables and fruits were studied by micro-Raman spectrometer (514.5 nm) and Near-infrared Fourier Transform Raman spectrometer (FTRaman). It is shown that at 514.5 nm excitation, most of the spectra are from that of carotene with some very strong fluorescence in some cases. While at 1064 nm wavelength excitation, the spectra from the different samples demonstrate different characteristic Raman spectra without fluorescence. We discuss the spectroscopic difference by the two excitation wavelengths, and the application of Raman spectra for detection of pesticides left on the surface of vegetables and fruits. Raman spectra of fruits and pesticides were successfully recorded, and using the FT-Raman spectra the pesticides left on the surface of the fruits can be detected conveniently

  4. Energetic Proton Spectra Measured by the Van Allen Probes

    Science.gov (United States)

    Summers, Danny; Shi, Run; Engebretson, Mark J.; Oksavik, Kjellmar; Manweiler, Jerry W.; Mitchell, Donald G.

    2017-10-01

    We test the hypothesis that pitch angle scattering by electromagnetic ion cyclotron (EMIC) waves can limit ring current proton fluxes. For two chosen magnetic storms, during 17-20 March 2013 and 17-20 March 2015, we measure proton energy spectra in the region 3 ≤ L ≤ 6 using the RBSPICE-B instrument on the Van Allen Probes. The most intense proton spectra are observed to occur during the recovery periods of the respective storms. Using proton precipitation data from the POES (NOAA and MetOp) spacecraft, we deduce that EMIC wave action was prevalent at the times and L-shell locations of the most intense proton spectra. We calculate limiting ring current proton energy spectra from recently developed theory. Comparisons between the observed proton energy spectra and the theoretical limiting spectra show reasonable agreement. We conclude that the measurements of the most intense proton spectra are consistent with self-limiting by EMIC wave scattering.

  5. Estudio Te\\'orico del espectro de emisi\\'on para un sistema microcavidad-punto cu\\'antico en una aproximaci\\'on de campo medio (Theoretical study of emission spectrum for a quantum dot-microcavity system in a mean field approximation)

    OpenAIRE

    Rojas-Arias, Juan S.; Rodriguez, B.; Vinck-Posada, Herbert

    2015-01-01

    En este trabajo, se obtiene una expresi\\'on num\\'erica para calcular el espectro de emisi\\'on de un sistema microcavidad-punto cu\\'antico usando una teor\\'ia de campo medio en el formalismo de la matriz densidad. El sistema modelado es un micropilar semiconductor que contiene un \\'unico punto cu\\'antico en el interior de la microcavidad, este sistema presenta p\\'erdida de fotones a trav\\'es de los espejos de la cavidad y bombeo de excitones al punto cu\\'antico. Obtenemos una ecuaci\\'on maestr...

  6. Running of featureful primordial power spectra

    Science.gov (United States)

    Gariazzo, Stefano; Mena, Olga; Miralles, Victor; Ramírez, Héctor; Boubekeur, Lotfi

    2017-06-01

    Current measurements of the temperature and polarization anisotropy power spectra of the cosmic microwave background (CMB) seem to indicate that the naive expectation for the slow-roll hierarchy within the most simple inflationary paradigm may not be respected in nature. We show that a primordial power spectrum with localized features could in principle give rise to the observed slow-roll anarchy when fitted to a featureless power spectrum. From a model comparison perspective, and assuming that nature has chosen a featureless primordial power spectrum, we find that, while with mock Planck data there is only weak evidence against a model with localized features, upcoming CMB missions may provide compelling evidence against such a nonstandard primordial power spectrum. This evidence could be reinforced if a featureless primordial power spectrum is independently confirmed from bispectrum and/or galaxy clustering measurements.

  7. Boundary spectra in superspace σ-models

    International Nuclear Information System (INIS)

    Quella, T.; Schomerus, V.; Creutzig, T.

    2007-12-01

    In this note we compute exact boundary spectra for D-instantons in σ-models on the supergroup PSL(22). Our results are obtained through an explicit summation of the perturbative expansion for conformal dimensions to all orders in the curvature radius. The analysis exploits several remarkable properties of the perturbation series that arises from rescalings of the metric on PSL(22) relative to a fixed Wess- Zumino term. According to Berkovits, Vafa and Witten, the models are relevant in the context of string theory on AdS 3 with non-vanishing RR-flux. The note concludes with a number of comments on various possible generalizations to other supergroups and higher dimensional supercoset theories. (orig.)

  8. Automated analysis of slitless spectra. II. Quasars

    International Nuclear Information System (INIS)

    Edwards, G.; Beauchemin, M.; Borra, F.

    1988-01-01

    Automated software have been developed to process slitless spectra. The software, described in a previous paper, automatically separates stars from extended objects and quasars from stars. This paper describes the quasar search techniques and discusses the results. The performance of the software is compared and calibrated with a plate taken in a region of SA 57 that has been extensively surveyed by others using a variety of techniques: the proposed automated software performs very well. It is found that an eye search of the same plate is less complete than the automated search: surveys that rely on eye searches suffer from incompleteness at least from a magnitude brighter than the plate limit. It is shown how the complete automated analysis of a plate and computer simulations are used to calibrate and understand the characteristics of the present data. 20 references

  9. Assessment of smoothed spectra using autocorrelation function

    International Nuclear Information System (INIS)

    Urbanski, P.; Kowalska, E.

    2006-01-01

    Recently, data and signal smoothing became almost standard procedures in the spectrometric and chromatographic methods. In radiometry, the main purpose to apply smoothing is minimisation of the statistical fluctuation and avoid distortion. The aim of the work was to find a qualitative parameter, which could be used, as a figure of merit for detecting distortion of the smoothed spectra, based on the linear model. It is assumed that as long as the part of the raw spectrum removed by the smoothing procedure (v s ) will be of random nature, the smoothed spectrum can be considered as undistorted. Thanks to this feature of the autocorrelation function, drifts of the mean value in the removed noise vs as well as its periodicity can be more easily detected from the autocorrelogram than from the original data

  10. Closed N-shell alkali spectra

    International Nuclear Information System (INIS)

    Ellis, D.G.; Curtis, L.J.

    1982-01-01

    Term values and ionization potentials have been calculated for several ions in the promethium (N = 61) isoelectronic sequence. As the nuclear charge is increased, the ground configuration changes from 4f 13 5s 2 to 4f 14 5s giving the upper portion of the sequence an alkali-like character. According to our most recent Hartree-Fock calculations with first-order relativistic corrections, the ground term is 5s 2 S for Z > 77 (Ir XVII) and the first excited term is 5p 2 P 0 for Z > 84 (P 0 XXIV). Comparisons are made with calculations of Cowan in W XIV. The prospects for observation of these spectra in fast ion beams are discussed. (orig.)

  11. Dielectric spectra of proteins in conducting media

    International Nuclear Information System (INIS)

    Ruderman, G.; Xammar Oro, J.R. de

    1990-10-01

    Dielectric measurements of serum albumin and myoglobin in solutions of varying conductivities were performed. The results presented confirm that also for protein solutions, the Maxwell predictions of a threshold frequency in conducting materials holds. The threshold frequency of a serum albumin solution was experimentally determined. Attention should be recalled that, if the dielectric spectra of proteins solutions want to be measured, three distinct frequency regions are to be observed: a low frequency region, where the sample behaves like a conductor; an intermediate region centered around the threshold frequency, where the free charges partially screen the fixed ones; and a high frequency region where the sample behaves like a good dielectric. (author). 8 refs, 5 figs

  12. Conformal Symmetry Patterns in Baryon Spectra

    International Nuclear Information System (INIS)

    Kirchbach, Mariana; Compean, Cliffor B

    2011-01-01

    Attention is drawn to the fact that the spectra of the baryons of the lightest flavors, the nucleon and the Δ, carry quantum numbers characteristic for an unitary representation of the conformal group. We show that the above phenomenon is well explained for baryons whose internal structure is dominated by a quark-diquark configuration that resides in a conformally compactified Minkowski space time, R 1 x S 3 , and is described by means of the conformal scale equation there. The R 1 x S 3 space-time represents the boundary of the conformally compactified AdS 5 , on which one expects to encounter a conformal theory in accord with the gauge-gravity duality. Within this context, our model is congruent with AdS 5 /CFT 4 .

  13. Automated analysis of objective-prism spectra

    International Nuclear Information System (INIS)

    Hewett, P.C.; Irwin, M.J.; Bunclark, P.; Bridgeland, M.T.; Kibblewhite, E.J.; Smith, M.G.

    1985-01-01

    A fully automated system for the location, measurement and analysis of large numbers of low-resolution objective-prism spectra is described. The system is based on the APM facility at the University of Cambridge, and allows processing of objective-prism, grens or grism data. Particular emphasis is placed on techniques to obtain the maximum signal-to-noise ratio from the data, both in the initial spectral estimation procedure and for subsequent feature identification. Comparison of a high-quality visual catalogue of faint quasar candidates with an equivalent automated sample demonstrates the ability of the APM system to identify all the visually selected quasar candidates. In addition, a large population of new, faint (msub(J)approx. 20) candidates is identified. (author)

  14. Modeling degradation in SOEC impedance spectra

    DEFF Research Database (Denmark)

    Jensen, Søren Højgaard; Hauch, Anne; Knibbe, Ruth

    2013-01-01

    Solid oxide cell (SOC) performance is limited by various processes. One way to investigate these processes is by electrochemical impedance spectroscopy. In order to quantify and characterize the processes, an equivalent circuit can be used to model the SOC impedance spectra (IS). Unfortunately......, the optimal equivalent circuit is often unknown and to complicate matters further, several processes contribute to the SOC impedance - making detailed process characterization difficult. In this work we analyze and model a series of IS measured during steam electrolysis operation of an SOC. During testing......, degradation is only observed in the Ni/YSZ electrode and not in the electrolyte or the LSM/YSZ electrode. A batch fit of the differences between the IS shows that a modified Gerischer element provides a better fit to the Ni/YSZ electrode impedance than the frequently used RQ element - albeit neither...

  15. Infrared Model Spectra for Evolving Red Supergiants

    Directory of Open Access Journals (Sweden)

    Kyung-Won Suh

    1993-06-01

    Full Text Available The space and ground based infrared spectra of red supergiants are modeled and arranged in order of their evolutionary status with their theoretical model parameters. The chemical compositions of the dust shells around red supergiants are affected by the nuclear reaction and dredge-up processes of the cental stars. The processes are sensitively dependent on the initial mass, the initial chemical composition, and the evolutionary status. Miras, infrared carbon stars, and OH/IR stars have close link in their evolution in manu aspects, i,e., the chemical composition, the optical depths and the mass loss rates. The evolutionary tracks for the three classes of red supergiants on infrared two-color diagrams have been made from model calculations and IRAS observational data.

  16. Increased Elemental Specificity of Positron Annihilation Spectra

    International Nuclear Information System (INIS)

    Asoka-Kumar, P.; Alatalo, M.; Ghosh, V.J.; Kruseman, A.C.; Nielsen, B.; Lynn, K.G.

    1996-01-01

    Positron annihilation spectroscopy (PAS) is a sensitive probe for studying the electronic structure of defects in solids. We show that the high-momentum part of the Doppler-broadened annihilation spectra can be used to distinguish different elements. This is achieved by using a new two-detector coincidence system to examine the line shape variations originating from high-momentum core electrons. Because the core electrons retain their atomic character even when atoms form a solid, these results can be directly compared to simple theoretical predictions. The new approach adds increased elemental specificity to the PAS technique, and is useful in studying the elemental variations around a defect site. copyright 1996 The American Physical Society

  17. Parameterization of MARVELS Spectra Using Deep Learning

    Science.gov (United States)

    Gilda, Sankalp; Ge, Jian; MARVELS

    2018-01-01

    Like many large-scale surveys, the Multi-Object APO Radial Velocity Exoplanet Large-area Survey (MARVELS) was designed to operate at a moderate spectral resolution ($\\sim$12,000) for efficiency in observing large samples, which makes the stellar parameterization difficult due to the high degree of blending of spectral features. Two extant solutions to deal with this issue are to utilize spectral synthesis, and to utilize spectral indices [Ghezzi et al. 2014]. While the former is a powerful and tested technique, it can often yield strongly coupled atmospheric parameters, and often requires high spectral resolution (Valenti & Piskunov 1996). The latter, though a promising technique utilizing measurements of equivalent widths of spectral indices, has only been employed with respect to FKG dwarfs and sub-giants and not red-giant branch stars, which constitute ~30% of MARVELS targets. In this work, we tackle this problem using a convolution neural network (CNN). In particular, we train a one-dimensional CNN on appropriately processed PHOENIX synthetic spectra using supervised training to automatically distinguish the features relevant for the determination of each of the three atmospheric parameters – T_eff, log(g), [Fe/H] – and use the knowledge thus gained by the network to parameterize 849 MARVELS giants. When tested on the synthetic spectra themselves, our estimates of the parameters were consistent to within 11 K, .02 dex, and .02 dex (in terms of mean absolute errors), respectively. For MARVELS dwarfs, the accuracies are 80K, .16 dex and .10 dex, respectively.

  18. A climatology of visible surface reflectance spectra

    International Nuclear Information System (INIS)

    Zoogman, Peter; Liu, Xiong; Chance, Kelly; Sun, Qingsong; Schaaf, Crystal; Mahr, Tobias; Wagner, Thomas

    2016-01-01

    We present a high spectral resolution climatology of visible surface reflectance as a function of wavelength for use in satellite measurements of ozone and other atmospheric species. The Tropospheric Emissions: Monitoring of Pollution (TEMPO) instrument is planned to measure backscattered solar radiation in the 290–740 nm range, including the ultraviolet and visible Chappuis ozone bands. Observation in the weak Chappuis band takes advantage of the relative transparency of the atmosphere in the visible to achieve sensitivity to near-surface ozone. However, due to the weakness of the ozone absorption features this measurement is more sensitive to errors in visible surface reflectance, which is highly variable. We utilize reflectance measurements of individual plant, man-made, and other surface types to calculate the primary modes of variability of visible surface reflectance at a high spectral resolution, comparable to that of TEMPO (0.6 nm). Using the Moderate-resolution Imaging Spectroradiometer (MODIS) Bidirection Reflectance Distribution Function (BRDF)/albedo product and our derived primary modes we construct a high spatial resolution climatology of wavelength-dependent surface reflectance over all viewing scenes and geometries. The Global Ozone Monitoring Experiment–2 (GOME-2) Lambertian Equivalent Reflectance (LER) product provides complementary information over water and snow scenes. Preliminary results using this approach in multispectral ultraviolet+visible ozone retrievals from the GOME-2 instrument show significant improvement to the fitting residuals over vegetated scenes. - Highlights: • Our goals was visible surface reflectance for satellite trace gas measurements. • Captured the range of surface reflectance spectra through EOF analysis. • Used satellite surface reflectance products for each given scene to anchor EOFs. • Generated a climatology of time/geometry dependent surface reflectance spectra. • Demonstrated potential to

  19. Spectra of small Koronis family members

    Science.gov (United States)

    Thomas, C.; Rivkin, A.; Trilling, D.; Moskovitz, N.

    2014-07-01

    The space-weathering process and its implications for the relationships between S- and Q-type asteroids and ordinary chondrite meteorites are long-standing problems in asteroid science. Although the visible and near-infrared spectra of S- and Q-type objects qualitatively show the same absorption features and quantitatively show evidence of the same minerals, the S types display increased spectral slopes and muted absorption features compared to the Q types. This spectral mismatch is consistent with the effects of the space weathering process. Binzel et al. provided the missing link between Q- and S-type bodies in near-Earth space by showing a reddening of spectral slope in objects from 0.1 to 5 km that corresponded to the transition from Q- to S-type spectra. This result implied that size, and therefore age, is related to the relationship between Q- and S-type. The existence of Q-type objects in the main belt was not confirmed until Mothe-Diniz and Nesvorny (2008) found them in young S-type clusters. To investigate the trend from Q to S in the main belt, we examined space weathering within the old main-belt Koronis family using a spectrophotometric survey (Rivkin et al. 2011, Thomas et al. 2011). Rivkin et al. (2011) identified several potential Q-type objects within the Koronis family. Our Q-type candidates were identified using broad-band spectrophotometry and could not be taxonomically classified on that basis alone. We obtained follow-up visible and near-infrared spectral observations of our potential Q-type objects, (26970) Elias, (45610) 2000 DJ_{48}, and (37411) 2001 XF_{152}, using Gemini and Magellan. We will present the results of these spectral follow-up observations. Observations of (26970) Elias demonstrate that the object is more consistent with the average Q-type spectrum than the average S-type spectrum.

  20. Strong ground motion spectra for layered media

    International Nuclear Information System (INIS)

    Askar, A.; Cakmak, A.S.; Engin, H.

    1977-01-01

    This article presents an analytic method and calculations of strong motion spectra for the energy, displacement, velocity and acceleration based on the physical and geometric ground properties at a site. Although earthquakes occur with large deformations and high stress intensities which necessarily lead to nonlinear phenomena, most analytical efforts to date have been based on linear analyses in engineering seismology and soil dynamics. There are, however, a wealth of problems such as the shifts in frequency, dispersion due to the amplitude, the generation of harmonics, removal of resonance infinities, which cannot be accounted for by a linear theory. In the study, the stress-strain law for soil is taken as tau=G 0 γ+G 1 γ 3 +etaγ where tau is the stress, γ is the strain, G 0 and G 1 are the elasticity coefficients and eta is the damping and are different in each layer. The above stress-strain law describes soils with hysterisis where the hysterisis loops for various amplitudes of the strain are no longer concentric ellipses as for linear relations but are oval shapes rotated with respect to each other similar to the materials with the Osgood-Ramberg law. It is observed that even slight nonlinearities may drastically alter the various response spectra from that given by linear analysis. In fact, primary waves cause resonance conditions such that secondary waves are generated. As a result, a weak energy transfer from the primary to the secondary waves takes place, thus altering the wave spectrum. The mathematical technique that is utilized for the solution of the nonlinear equation is a special perturbation method as an extension of Poincare's procedure. The method considers shifts in the frequencies which are determined by the boundedness of the energy

  1. Spectroscopic modeling for tungsten EUV spectra

    International Nuclear Information System (INIS)

    Murakami, Izumi; Kato, Daiji; Sakaue, Hiroyuki A.; Suzuki, Chihiro; Morita, Shigeru; Goto, Motoshi; Sasaki, Akira; Nakamura, Nobuyuki; Yamamoto, Norimasa; Koike, Fumihiro

    2014-01-01

    We have constructed an atomic model for tungsten extreme ultraviolet (EUV) spectra to reconstruct characteristic spectral feature of unresolved transition array (UTA) observed at 4-7 nm for tungsten ions. In the tungsten atomic modeling, we considered fine-structure levels with the quantum principal number n up to 6 as the atomic structure and calculated the electron-impact collision cross sections by relativistic distorted-wave method, using HULLAC atomic code. We measured tungsten EUV spectra in Large Helical Device (LHD) and Compact Electron Beam Ion Trap device (CoBIT) and compared them with the model calculation. The model successfully explain series of emission peaks at 1.5-3.5 nm as n=5-4 and 6-4 transitions of W"2"4"+ - W"3"2"+ measured in CoBIT and LHD and the charge state distributions were estimated for LHD plasma. The UTA feature observed at 4-7 nm was also successfully reconstructed with our model. The peak at ∼5 nm is produced mainly by many 4f-4d transition of W"2"2"+ - W"3"5"+ ions, and the second peak at ∼6 nm is produced by 4f-4d transition of W"2"5"+ - W"2"8"+ ions, and 4d-4p inner-shell transitions, 4p"54d"n"+"1 - 4p"64d"n, of W"2"9"+ - W"3"5"+ ions. These 4d-4p inner-shell transitions become strong since we included higher excited states such as 4p"54d"n4f state, which ADAS atomic data set does not include for spectroscopic modeling with fine structure levels. (author)

  2. Curved Radio Spectra of Weak Cluster Shocks

    Science.gov (United States)

    Kang, Hyesung; Ryu, Dongsu

    2015-08-01

    In order to understand certain observed features of arc-like giant radio relics such as the rareness, uniform surface brightness, and curved integrated spectra, we explore a diffusive shock acceleration (DSA) model for radio relics in which a spherical shock impinges on a magnetized cloud containing fossil relativistic electrons. Toward this end, we perform DSA simulations of spherical shocks with the parameters relevant for the Sausage radio relic in cluster CIZA J2242.8+5301, and calculate the ensuing radio synchrotron emission from re-accelerated electrons. Three types of fossil electron populations are considered: a delta-function like population with the shock injection momentum, a power-law distribution, and a power law with an exponential cutoff. The surface brightness profile of the radio-emitting postshock region and the volume-integrated radio spectrum are calculated and compared with observations. We find that the observed width of the Sausage relic can be explained reasonably well by shocks with speed {u}{{s}}˜ 3× {10}3 {km} {{{s}}}-1 and sonic Mach number {M}{{s}}˜ 3. These shocks produce curved radio spectra that steepen gradually over (0.1-10){ν }{br} with a break frequency {ν }{br}˜ 1 GHz if the duration of electron acceleration is ˜60-80 Myr. However, the abrupt increase in the spectral index above ˜1.5 GHz observed in the Sausage relic seems to indicate that additional physical processes, other than radiative losses, operate for electrons with {γ }{{e}}≳ {10}4.

  3. [Raman spectra of monkey cerebral cortex tissue].

    Science.gov (United States)

    Zhu, Ji-chun; Guo, Jian-yu; Cai, Wei-ying; Wang, Zu-geng; Sun, Zhen-rong

    2010-01-01

    Monkey cerebral cortex, an important part in the brain to control action and thought activities, is mainly composed of grey matter and nerve cell. In the present paper, the in situ Raman spectra of the cerebral cortex of the birth, teenage and aged monkeys were achieved for the first time. The results show that the Raman spectra for the different age monkey cerebral cortex exhibit most obvious changes in the regions of 1000-1400 and 2800-3000 cm(-1). With monkey growing up, the relative intensities of the Raman bands at 1313 and 2885 cm(-1) mainly assigned to CH2 chain vibrational mode of lipid become stronger and stronger whereas the relative intensities of the Raman bands at 1338 and 2932 cm(-1) mainly assigned to CH3 chain vibrational mode of protein become weaker and weaker. In addition, the two new Raman bands at 1296 and 2850 cm(-1) are only observed in the aged monkey cerebral cortex, therefore, the two bands can be considered as a character or "marker" to differentiate the caducity degree with monkey growth In order to further explore the changes, the relative intensity ratios of the Raman band at 1313 cm(-1) to that at 1338 cm(-1) and the Raman band at 2885 cm(-1) to that at 2 932 cm(-1), I1313/I1338 and I2885/I2932, which are the lipid-to-protein ratios, are introduced to denote the degree of the lipid content. The results show that the relative intensity ratios increase significantly with monkey growth, namely, the lipid content in the cerebral cortex increases greatly with monkey growth. So, the authors can deduce that the overmuch lipid is an important cause to induce the caducity. Therefore, the results will be a powerful assistance and valuable parameter to study the order of life growth and diagnose diseases.

  4. Spectra and physical properties of Taurid meteoroids

    Science.gov (United States)

    Matlovič, Pavol; Tóth, Juraj; Rudawska, Regina; Kornoš, Leonard

    2017-09-01

    Taurids are an extensive stream of particles produced by comet 2P/Encke, which can be observed mainly in October and November as a series of meteor showers rich in bright fireballs. Several near-Earth asteroids have also been linked with the meteoroid complex, and recently the orbits of two carbonaceous meteorites were proposed to be related to the stream, raising interesting questions about the origin of the complex and the composition of 2P/Encke. Our aim is to investigate the nature and diversity of Taurid meteoroids by studying their spectral, orbital, and physical properties determined from video meteor observations. Here we analyze 33 Taurid meteor spectra captured during the predicted outburst in November 2015 by stations in Slovakia and Chile, including 14 multi-station observations for which the orbital elements, material strength parameters, dynamic pressures, and mineralogical densities were determined. It was found that while orbits of the 2015 Taurids show similarities with several associated asteroids, the obtained spectral and physical characteristics point towards cometary origin with highly heterogeneous content. Observed spectra exhibited large dispersion of iron content and significant Na intensity in all cases. The determined material strengths are typically cometary in the KB classification, while PE criterion is on average close to values characteristic for carbonaceous bodies. The studied meteoroids were found to break up under low dynamic pressures of 0.02-0.10 MPa, and were characterized by low mineralogical densities of 1.3-2.5 g cm-3. The widest spectral classification of Taurid meteors to date is presented.

  5. Path spectra derived from inversion of source and site spectra for earthquakes in Southern California

    Science.gov (United States)

    Klimasewski, A.; Sahakian, V. J.; Baltay, A.; Boatwright, J.; Fletcher, J. B.; Baker, L. M.

    2017-12-01

    A large source of epistemic uncertainty in Ground Motion Prediction Equations (GMPEs) is derived from the path term, currently represented as a simple geometric spreading and intrinsic attenuation term. Including additional physical relationships between the path properties and predicted ground motions would produce more accurate and precise, region-specific GMPEs by reclassifying some of the random, aleatory uncertainty as epistemic. This study focuses on regions of Southern California, using data from the Anza network and Southern California Seismic network to create a catalog of events magnitude 2.5 and larger from 1998 to 2016. The catalog encompasses regions of varying geology and therefore varying path and site attenuation. Within this catalog of events, we investigate several collections of event region-to-station pairs, each of which share similar origin locations and stations so that all events have similar paths. Compared with a simple regional GMPE, these paths consistently have high or low residuals. By working with events that have the same path, we can isolate source and site effects, and focus on the remaining residual as path effects. We decompose the recordings into source and site spectra for each unique event and site in our greater Southern California regional database using the inversion method of Andrews (1986). This model represents each natural log record spectra as the sum of its natural log event and site spectra, while constraining each record to a reference site or Brune source spectrum. We estimate a regional, path-specific anelastic attenuation (Q) and site attenuation (t*) from the inversion site spectra and corner frequency from the inversion event spectra. We then compute the residuals between the observed record data, and the inversion model prediction (event*site spectra). This residual is representative of path effects, likely anelastic attenuation along the path that varies from the regional median attenuation. We examine the

  6. Peakr: simulating solid-state NMR spectra of proteins

    International Nuclear Information System (INIS)

    Schneider, Robert; Odronitz, Florian; Hammesfahr, Bjorn; Hellkamp, Marcel; Kollmar, Martin

    2013-01-01

    When analyzing solid-state nuclear magnetic resonance (NMR) spectra of proteins, assignment of resonances to nuclei and derivation of restraints for 3D structure calculations are challenging and time-consuming processes. Simulated spectra that have been calculated based on, for example, chemical shift predictions and structural models can be of considerable help. Existing solutions are typically limited in the type of experiment they can consider and difficult to adapt to different settings. Here, we present Peakr, a software to simulate solid-state NMR spectra of proteins. It can generate simulated spectra based on numerous common types of internuclear correlations relevant for assignment and structure elucidation, can compare simulated and experimental spectra and produces lists and visualizations useful for analyzing measured spectra. Compared with other solutions, it is fast, versatile and user friendly. (authors)

  7. Principal spectra describing magnetooptic permittivity tensor in cubic crystals

    Energy Technology Data Exchange (ETDEWEB)

    Hamrlová, Jana [Nanotechnology Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); IT4Innovations Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Legut, Dominik [IT4Innovations Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Veis, Martin [Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, Prague, 121 16 Czech Republic (Czech Republic); Pištora, Jaromír [Nanotechnology Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Hamrle, Jaroslav, E-mail: jaroslav.hamrle@vsb.cz [IT4Innovations Centre, VSB – Technical University of Ostrava, listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic); Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, Prague, 121 16 Czech Republic (Czech Republic); Department of Physics, VSB – Technical University of Ostrava, 17. listopadu 15, Ostrava, 708 33 Czech Republic (Czech Republic)

    2016-12-15

    We provide unified phenomenological description of magnetooptic effects being linear and quadratic in magnetization. The description is based on few principal spectra, describing elements of permittivity tensor up to the second order in magnetization. Each permittivity tensor element for any magnetization direction and any sample surface orientation is simply determined by weighted summation of the principal spectra, where weights are given by crystallographic and magnetization orientations. The number of principal spectra depends on the symmetry of the crystal. In cubic crystals owning point symmetry we need only four principal spectra. Here, the principal spectra are expressed by ab initio calculations for bcc Fe, fcc Co and fcc Ni in optical range as well as in hard and soft x-ray energy range, i.e. at the 2p- and 3p-edges. We also express principal spectra analytically using modified Kubo formula.

  8. Inclusive sum rules and spectra of neutrons at the ISR

    International Nuclear Information System (INIS)

    Grigoryan, A.A.

    1975-01-01

    Neutron spectra in pp collisions at ISR energies are studied in the framework of sum rules for inclusive processes. The contributions of protons, π- and E- mesons to the energy sum rule are calculated at √5 = 53 GeV. It is shown by means of this sum rule that the spectra of neutrons at the ISR are in contradiction with the spectra of other particles also measured at the ISR

  9. A method to enhance the resolution of broadened spectra

    Energy Technology Data Exchange (ETDEWEB)

    Cabral P, A.; Jimenez D, H.; Torres V, M.; Azorin N, J.; Gutierrez C, A.; Gonzalez M, P.R.; Lopez E, J. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico); Fuentes Z, G.A.; Cordoba, A. [UAM-I, 09340 Mexico D.F. (Mexico)

    1992-02-15

    A deconvolution method to analyze line overlapping broadened spectra is presented. Two approximation expressions from which the user can remove, either a Lorentzian or a Gaussian line from observed spectra are utilized. Moessbauer spectra, EPR and Thermoluminescence spectroscopies are analyzed. It is shown that in each case, the de convolved spectrum may provide valuable data to get a much closer characterization of a substance. (Author)

  10. A method to enhance the resolution of broadened spectra

    International Nuclear Information System (INIS)

    Cabral P, A.; Jimenez D, H.; Torres V, M.; Azorin N, J.; Gutierrez C, A.; Gonzalez M, P.R.; Lopez E, J.; Fuentes Z, G.A.; Cordoba, A.

    1992-02-01

    A deconvolution method to analyze line overlapping broadened spectra is presented. Two approximation expressions from which the user can remove, either a Lorentzian or a Gaussian line from observed spectra are utilized. Moessbauer spectra, EPR and Thermoluminescence spectroscopies are analyzed. It is shown that in each case, the de convolved spectrum may provide valuable data to get a much closer characterization of a substance. (Author)

  11. Geal: A general program for the analysis of alpha spectra

    International Nuclear Information System (INIS)

    Garcia-Torano, E.; Acena Barrenechea, M.L.

    1978-01-01

    A computing program for analysis and representation of alpha spectra obtained with surface barrier detectors is described. Several methods for fitting spectra are studied. A monoenergetic line or a doublet previously fitted has been used as a standard for the analyses of all kind of spectra. Some examples of application as well as a list of the program are shown. The program has been written in Fortran V language. (author)

  12. Incorporating Nuisance Parameters in Likelihoods for Multisource Spectra

    CERN Document Server

    Conway, J.S.

    2011-01-01

    We describe here the general mathematical approach to constructing likelihoods for fitting observed spectra in one or more dimensions with multiple sources, including the effects of systematic uncertainties represented as nuisance parameters, when the likelihood is to be maximized with respect to these parameters. We consider three types of nuisance parameters: simple multiplicative factors, source spectra "morphing" parameters, and parameters representing statistical uncertainties in the predicted source spectra.

  13. Atomic and molecular effects in the VUV spectra of solids

    International Nuclear Information System (INIS)

    Sonntag, B.

    1977-10-01

    The VUV spectra of solids are often dominated by atomic or molecular effects, which clearly manifest themselves in the gross features of the spectra and the fine structure at inner shell excitation thresholds. Evidence for the influence of atomic and molecular matrix elements, multiplet-splitting and correlation is presented. Special emphasis is given to the direct experimental verification based on the comparison of atomic and solid state spectra. (orig.) [de

  14. Espectro polínico de amostras de mel de Apis mellifera L., coletadas na Bahia Pollen spectrum of samples of Apis mellifera L., honey collected in Bahia State, Brazil

    Directory of Open Access Journals (Sweden)

    AUGUSTA CAROLINA DE CAMARGO CARMELLO MORETI

    2000-01-01

    Full Text Available O espectro polínico encontrado em amostras de mel provenientes de seis municípios do Estado da Bahia foi analisado com o objetivo de contribuir para o conhecimento da flora visitada por Apis mellifera L. 1758 (Hymenoptera: ApidaeA identificação dos tipos polínicos foi feita por meio de literatura especializada e de informações de campo. Foram encontrados 43 tipos de pólen, sendo consideradas como dominantes as espécies Eucalyptus sp. (Myrtaceae, Mimosa verrucosa Benth. (Mimosaceae, M. scabrella Benth. (Mimosaceae e Bauhinia sp. (Caesalpiniaceae. Os tipos acessórios foram Alternanthera ficoidea R.Br. (Amaranthaceae, tipo Compositae (Asteraceae e Cecropia sp. (Moraceae. Destacou-se a participação de Mimosa sp. (Mimosaceae e de outras espécies silvestres na composição dos méis nos municípios considerados, registrando-se ainda a espécie Eucalyptus sp. (Myrtaceae como uma das principais fontes de alimento das abelhas dessa região.Pollen spectrum found in honey samples from six localities of Bahia State, Brazil, was analyzed with the objective to contribute for the knowledge of the plants used by Apis mellifera L., 1758 (Hymenoptera: Apidae. The identification of the pollen types was made by specialized literature and by field information. Two hundred pollen grains were studied in order to determine the percentage and the occurrence of each type. Forty three pollen types were identified, being considered as the predominant types Eucalyptus sp. (Myrtaceae, Mimosa verrucosa Benth. (Mimosaceae, M. scabrella Benth. (Mimosaceae and Bauhinia sp. (Caesalpiniaceae. The accessory pollen types were Alternanthera ficoidea R.Br. (Amaranthaceae, Compositae type (Asteraceae and Cecropia sp. (Moraceae. It is intense the participation of Mimosa sp. (Mimosaceae and other wild species in the honey composition of the six localities considered. Eucalyptus sp. (Myrtaceae is one of the dominant sources of bee food in some regions of Bahia State.

  15. Factores de riesgo para el desarrollo de infección de vías urinarias por microorganismos productores de betalactamasas de espectro extendido adquiridos en la comunidad, en dos hospitales de Bogotá D.C., Colombia

    Directory of Open Access Journals (Sweden)

    Mariana Pineda-Posada

    Full Text Available Abstract Objetivo: Determinar factores de riesgo para infección urinaria por microorganismos productores de betalactamasas de espectro extendido (BLEE adquirida en la comunidad en pacientes adultos. Material y método: Estudio de casos y controles, en el período comprendido entre enero de 2012 a mayo de 2015, en dos hospitales de Bogotá D.C., Colombia. Pareo por edad, año del aislamiento, microorganismo y género. Se excluyeron pacientes con antecedente de infección por un microorganismo productor de BLEE en el último mes e infección urinaria asociada al cuidado de la salud. Resultados: Se analizaron 555 pacientes: 185 casos y 370 controles. 462 pacientes (83,2% de la Fundación Clínica Shaio y 93 (16,8% del Hospital Santa Clara. Factores de riesgo identificados: Infección urinaria recurrente (OR 2,13 con IC de 1,48 a 3,07, enfermedad renal crónica (OR 1,56, IC del 95% de 1,07 a 2,27, uso previo de antibióticos (OR 3,46, IC del 95% de 2,48 a 5,35, hospitalización reciente (OR 3,0, IC del 95% de 1,96 a 2,45, diabetes mellitus (OR 1,61 con IC del 95% de 1,06 a 2,45 e infección urinaria alta (OR 2,64 con IC del 95% de 1,61 a 4,32. Conclusiones: Los factores de riesgo para microorganismos productores de BLEE adquiridos en la comunidad fueron en orden de frecuencia: antecedente de antibioticoterapia reciente, hospitalización previa, presencia de infección urinaria alta, así como los antecedentes de infección urinaria recurrente, enfermedad renal crónica y diabetes mellitus, lo que concuerda con los principales hallazgos descritos en la literatura mundial.

  16. Central nervous system abnormalities in patients with oculo-auriculo-vertebral spectrum (Goldenhar syndrome Anormalidades do sistema nervoso central em pacientes com espectro óculo-aurículo-vertebral (síndrome de Goldenhar

    Directory of Open Access Journals (Sweden)

    Rafael Fabiano Machado Rosa

    2010-02-01

    Full Text Available OBJECTIVE: To describe the central nervous system (CNS alterations present in a sample of oculo-auriculo-vertebral spectrum (OAVS patients, trying to correlate them with other clinical features. METHOD: Seventeen patients with diagnosis of OAVS were evaluated. All presented radiological evaluation of the CNS, normal GTG-Banding karyotype and clinical features involving at least two from the four following areas: oro-cranio-facial, ocular, auricular and vertebral. RESULTS: CNS alterations were verified in eight from seventeen patients (47%. Diffuse cerebral hypoplasia, dilated lateral cerebral ventricles (asymptomatic hydrocephalus, corpus callosum dysgenesis and frontal hypodensities were the most frequent abnormalities. Presence of ophthalmologic abnormalities was the only clinical association observed, being significantly more frequent among patients with cerebral alterations (63% versus 11%. CONCLUSION: CNS abnormalities are frequent in patients with OAVS, especially in carriers of ophthalmologic alterations. However, the absence of detectable cerebral abnormalities did not exclude the possibility that these subjects will subsequently present neurological symptoms.OBJETIVO: Descrever as alterações do sistema nervoso central (SNC presentes em uma amostra de pacientes com espectro óculo-aurículo-vertebral (EOAV, tentando correlacioná-las com os demais achados clínicos. MÉTODO: Foram avaliados dezessete pacientes com diagnóstico de EOAV. Todos apresentavam avaliação radiológica do SNC, cariótipo por bandas GTG normal e achados clínicos em pelo menos duas das quatro das seguintes áreas: oro-crânio-facial, ocular, auricular e vertebral. RESULTADOS: Alterações do SNC foram verificadas em oito dos dezessete pacientes (47%. Hipoplasia cerebral difusa, dilatação dos ventrículos cerebrais laterais (hidrocefalia assintomática, disgenesia do corpo caloso e hipondesidades frontais foram as anormalidades mais frequentes. A presença de

  17. Métodos alternativos para detecção de betalactamase de espectro estendido em Escherichia coli e Klebsiella pneumoniae Alternative methods for the detection of extended-spectrum-beta-lactamase in Escherichia coli and Klebsiella pneumoniae

    Directory of Open Access Journals (Sweden)

    Alexsander Costa Martins

    2011-08-01

    Full Text Available INTRODUÇÃO: A resistência a antimicrobianos tem aumentado rapidamente nos últimos anos no Brasil e no mundo e, embora exista uma variedade de mecanismos de resistência, destaca-se a produção de betalactamase de espectro estendido (ESBL como um dos principais. Essas enzimas são mediadas por plasmídios, conferem resistência a vários antimicrobianos betalactâmicos e são inibidas por compostos, como ácido clavulânico, sulbactam e tazobactam. OBJETIVO: O objetivo deste estudo foi comparar metodologias alternativas à técnica padrão preconizada pelo Clinical and Laboratory Standards Institute (CLSI para detecção de ESBL. MATERIAL E MÉTODO: Foram realizados testes com 36 isolados (26 de E. coli e 10 de K. pneumoniae mediante disco combinado (CLSI e técnicas alternativas designadas meio disco (MD e substituição de discos (SD. CONCLUSÃO: As duas metodologias propostas apresentaram resultados satisfatórios com sensibilidade superior a 90% e custo inferior à técnica de referência (disco combinado, podendo ser utilizadas na pesquisa de ESBL.INTRODUCTION: Antimicrobial resistance has increased apace in Brazil and worldwide in the last years, even though there is a great variety of resistance mechanisms and extended spectrum beta-lactamases (ESBL is among the main ones. These enzymes are plasmid mediated, which causes resistance to some beta-lactam antimicrobials and are inhibited by compounds such as clavulanic acid, sulbactam and tazobactam. OBJECTIVE: The objective of this study was to compare alternative methods to the standard ESBL detection technique recommended by the Clinical and Laboratory Standards Institute (CLSI. MATERIAL AND METHOD: Tests with 36 isolates (26 E. coli and 10 K. pneumoniae were performed by means of CLSI disk diffusion method and alternative techniques designated as half disk (HD and disk substitution (SD. CONCLUSION: Both methods yielded satisfactory results with higher sensitivity (90% and lower costs

  18. A Eficácia de um Programa de Treino de Trampolins na Proficiência Motora de Crianças com Transtorno do Espectro do Autismo1

    Directory of Open Access Journals (Sweden)

    Carla Cristina Vieira LOURENÇO

    2016-03-01

    Full Text Available RESUMO: crianças com transtorno do espectro do autismo (TEA apresentam um desempenho motor inferior às crianças em geral. Com este estudo pretende-se avaliar a eficácia de um programa de treino de trampolins, com a duração de 20 semanas, na proficiência motora e índice de massa corporal (IMC de crianças com TEA. Participaram um total de 17 crianças (entre os 4 e os 10 anos de idade com diagnóstico de TEA, que foram distribuídas por dois grupos: grupo experimental (n=6, e controlo (n=11. O grupo experimental foi submetido a uma sessão de treino de trampolins por semana com uma duração de 45 minutos. O grupo de controlo compreende crianças cuja atividade física foi limitada ao currículo obrigatório. A proficiência motora foi avaliada através da bateria de testes Bruininks - Oseretsky. O IMC foi calculado recorrendo à fórmula internacionalmente referenciada. Para análise de variância de medidas repetidas (ANOVA. Ambos os grupos apresentaram características idênticas na avaliação inicial. No que se refere à proficiência motora foram evidentes e significativas as melhorias no GE após o programa de trampolins de 20 semanas (p0.05. Relativamente ao IMC não se registraram alterações significativas em ambos os grupos com a realização do programa de trampolins (p>0.05. Em face deste quadro de resultados é possível concluir que a participação em um programa de trampolins com a duração de 20 semanas contribuiu para melhorar significativamente a proficiência motora de crianças com TEA.

  19. Theory of optical spectra of solvated electrons

    International Nuclear Information System (INIS)

    Kestner, N.R.

    1975-01-01

    During the last few years better theoretical models of solvated electron have been developed. These models allow one to calculate a priori the observable properties of the trapped electron. One of the most important and most widely determined properties is the optical spectrum. In this paper we consider the predictions of the theories not only as to the band maximum but line shape and width. In addition we will review how the theories predict these will depend on the solvent, pressure, temperature, and solvent density. In all cases extensive comparisons will be made with experimental work. In addition four new areas will be explored and recent results will be presented. These concern electrons in dense polar gases, the time development of the solvated electron spectrum, solvated electrons in mixed solvents, and photoelectron emission spectra (PEE) as it relates to higher excited states. This paper will review all recent theoretical calculations and present a critical review of the present status and future developments which are anticipated. The best theories are quite successful in predicting trends, and qualitative agreement concerning band maximum. The theory is still weak in predicting line shape and line width

  20. Mass spectra of alicylic compounds Pt. 8

    International Nuclear Information System (INIS)

    Remane, H.; Haufe, G.

    1980-01-01

    Mass spectrometric fragmentation of C 5 -C 8 as well as C 12 ring systems of tBHC and tBMC is discussed and compared to the fragmentation of Br-, hydroxy- and methoxy cycloalkanes of similar ring sizes. The dominant processes are the splitting of the functional groups yielding M-H 2 O 1+ , M-HOCH 3 1+ and M-Br 1+ fragments, and the disintegration of the rings producing C 3 H 4 X 1+ fragments (X=Br, OH, OCH 3 ). Intensities of the more important fragments correspond to the size of the ring. The isomers can be distinguished by their mass spectra due to the inequality of the intensities of the trans- and cis-forms of BHC and BMC. Functional groups influence mass spectrometric fragmentation as it is indicated by the correlation of the fragments of the bis-functional tBHC and tBMC and the fragments of monofractional compounds. (Sz.J.)

  1. On temperature spectra in grid turbulence

    International Nuclear Information System (INIS)

    Jayesh; Tong, C.; Warhaft, Z.

    1994-01-01

    This paper reports wind tunnel measurements of passive temperature spectra in decaying grid generated turbulence both with and without a mean transverse temperature gradient. The measurements cover a turbulence Reynolds number range 60 l 3/4 l . The remarkably low Reynolds number onset (Re l ∼70) of Kolmogorov--Obukhov--Corrsin scaling in isotropic grid turbulence is contrasted to the case of scalars in (anisotropic) shear flows where KOC scaling only appears at very high-Reynolds numbers (Re l ∼10 5 ). It is also shown that when the temperature fluctuations are inserted very close to the grid in the absence of a gradient (by means of a mandoline), the temperature spectrum behaves in a similar way to the linear gradient case, i.e., a spectrum with a scaling exponent close to -5/3 is observed, a result noted earlier in heated grid experiments. However, when the scalar is inserted farther downstream of the grid (in the fully developed turbulence), the spectrum has a scaling region of -1.3 and its dilation with Re is less well defined than for the other cases. The velocity spectrum is also shown to have a scaling region, of slope -1.3, and its onset occurs at higher Reynolds number than for the case of the scalar experiments that exhibit the KOC scaling

  2. System of pattern analysis of PIXE spectra

    Energy Technology Data Exchange (ETDEWEB)

    Murozono, K; Iwasaki, S; Inoue, J; Ishii, K; Kitamura, M [Tohoku Univ., Sendai (Japan). Faculty of Engineering; Sera, K; Futatsugawa, S

    1996-07-01

    We have developed an analysis system based on the pattern analysis method. By testing the system, several difficulties of the present method have been identified. We found the following solutions for them: pre-selection of candidate elements in a sample and the use of a proper absorber. The pre-selection of the candidate elements will not be a serious drawback in the industrial PIXE, because it will be easy to pre-process the spectra for a few samples in the beginning of the mass processing of samples of the same kind. On the other hand, reduction of the efficiency due to the use of funny filter is significant only in the lower energy region, where we usually do not suffer from insufficient yields of lighter elements in common samples. The selection of the most suitable filter requires PIXE user to be deeply experienced. In particular, it is not easy to choose the best filter to suppress the yield of peak of an abundant element as the absorption edge filter. It will be important task to find a set of suitable combination of representative samples and corresponding filters. Furthermore, the peak profile model should be improved from the simple Gaussian approximation to more realistic ones with exponential tail, flat component below the peak and escape peaks, etc. It is also necessary to develop a theoretical approach for the background shape of the bremsstrahlung. (J.P.N.)

  3. Evaluating Lyapunov exponent spectra with neural networks

    International Nuclear Information System (INIS)

    Maus, A.; Sprott, J.C.

    2013-01-01

    Highlights: • Cross-correlation is employed to remove spurious Lyapunov exponents from a spectrum. • Neural networks are shown to accurately model Lyapunov exponent spectra. • Neural networks compare favorably to local linear fits in modeling Lyapunov exponents. • Numerical experiments are performed with time series of varying length and noise. • Methods perform reasonably well on discrete time series. -- Abstract: A method using discrete cross-correlation for identifying and removing spurious Lyapunov exponents when embedding experimental data in a dimension greater than the original system is introduced. The method uses a distribution of calculated exponent values produced by modeling a single time series many times or multiple instances of a time series. For this task, global models are shown to compare favorably to local models traditionally used for time series taken from the Hénon map and delayed Hénon map, especially when the time series are short or contaminated by noise. An additional merit of global modeling is its ability to estimate the dynamical and geometrical properties of the original system such as the attractor dimension, entropy, and lag space, although consideration must be taken for the time it takes to train the global models

  4. Estimating Eulerian spectra from pairs of drifters

    Science.gov (United States)

    LaCasce, Joe

    2017-04-01

    GPS-tracked surface drifters offer the possibility of sampling energetic variations at the ocean surface on scales of only 10s of meters, much less than that resolved by satellite. Here we investigate whether velocity differences between pairs of drifters can be used to estimate kinetic energy spectra. Theoretical relations between the spectrum and the second-order longitudinal structure function for 2D non-divergent flow are derived. The structure function is a natural statistic for particle pairs and is easily calculated. However it integrates contributions across wavenumber, and this tends to obscure the spectral dependencies when turbulent inertial ranges are of finite extent. Nevertheless, the transform from spectrum to structure function is robust, as illustrated with Eulerian data collected from aircraft. The inverse transform, from structure function to spectrum, is much less robust, yielding poor results in particular at large wavenumbers. This occurs because the transform involves a filter function which magnifies contributions from large pair separations, which tend to be noisy. Fitting the structure function to a polynomial improves the spectral estimate, but not sufficiently to distinguish correct inertial range dependencies. Thus with Lagrangian data, it is appears preferable to focus on structure functions, despite their shortcomings.

  5. Absorption Spectra of Gold Nanoparticle Suspensions

    Science.gov (United States)

    Anan'eva, M. V.; Nurmukhametov, D. R.; Zverev, A. S.; Nelyubina, N. V.; Zvekov, A. A.; Russakov, D. M.; Kalenskii, A. V.; Eremenko, A. N.

    2018-02-01

    Three gold nanoparticle suspensions are obtained, and mean radii in distributions - (6.1 ± 0.2), (11.9 ± 0.3), and (17.3 ± 0.7) nm - are determined by the transmission electron microscopy method. The optical absorption spectra of suspensions are obtained and studied. Calculation of spectral dependences of the absorption index of suspensions at values of the gold complex refractive index taken from the literature showed a significant deviation of experimental and calculated data in the region of 450-800 nm. Spectral dependences of the absorption of suspensions are simulated within the framework of the Mie-Drude theory taking into account the interband absorption in the form of an additional term in the imaginary part of the dielectric permittivity of the Gaussian type. It is shown that to quantify the spectral dependences in the region of the plasmon absorption band of nanoparticles, correction of the parameters of the interband absorption is necessary in addition to the increase of the relaxation parameter of the Drude theory. Spectral dependences of the dielectric permittivity of gold in nanodimensional state are refined from the solution of the inverse problem. The results of the present work are important for predicting the special features of operation of photonic devices and optical detonators based on gold nanoparticles.

  6. Program for the surface muon spectra calculation

    International Nuclear Information System (INIS)

    Arkatov, Yu.M.; Voloshchuk, V.I.; Zolenko, V.A.; Prokhorets, I.M.; Soldatov, S.A.

    1987-01-01

    Program for the ''surface'' muon spectrum calculation is described. The algorithm is based on simulation of coordinates of π-meson birth point and direction of its escape from meson-forming target (MFT) according to angular distribution with the use of Monte Carlo method. Ionization losses of π-(μ)-mesons in the target are taken into account in the program. Calculation of ''surface'' muon spectrum is performed in the range of electron energies from 150 MeV up to 1000 MeV. Spectra of π-mesons are calculated with account of ionization losses in the target and without it. Distributions over lengths of π-meson paths in MFT and contribution of separate sections of the target to pion flux at the outlet of meson channel are calculated as well. Meson-forming target for calculation can be made of any material. The program provides for the use of the MFT itself in the form of photon converter or photon converter is located in front of the target. The program is composed of 13 subprograms; 2 of them represent generators of pseudorandom numbers, distributed uniformly in the range from 0 up to 1, and numbers with Gauss distribution. Example of calculation for copper target of 3 cm length, electron beam current-1 μA, energy-300 MeV is presented

  7. Inflationary power spectra with quantum holonomy corrections

    Energy Technology Data Exchange (ETDEWEB)

    Mielczarek, Jakub, E-mail: jakub.mielczarek@uj.edu.pl [Institute of Physics, Jagiellonian University, Reymonta 4, Cracow, 30-059 Poland (Poland)

    2014-03-01

    In this paper we study slow-roll inflation with holonomy corrections from loop quantum cosmology. It was previously shown that, in the Planck epoch, these corrections lead to such effects as singularity avoidance, metric signature change and a state of silence. Here, we consider holonomy corrections affecting the phase of cosmic inflation, which takes place away from the Planck epoch. Both tensor and scalar power spectra of primordial inflationary perturbations are computed up to the first order in slow-roll parameters and V/ρ{sub c}, where V is a potential of the scalar field and ρ{sub c} is a critical energy density (expected to be of the order of the Planck energy density). Possible normalizations of modes at short scales are discussed. In case the normalization is performed with use of the Wronskian condition applied to adiabatic vacuum, the tensor and scalar spectral indices are not quantum corrected in the leading order. However, by choosing an alternative method of normalization one can obtain quantum corrections in the leading order. Furthermore, we show that the holonomy-corrected equations of motion for tensor and scalar modes can be derived based on effective background metrics. This allows us to show that the classical Wronskian normalization condition is well defined for the cosmological perturbations with holonomy corrections.

  8. Collapse postulate for observables with continuous spectra

    International Nuclear Information System (INIS)

    Srinivas, M.D.; Madras Univ.

    1980-01-01

    In order to provide a mathematical framework for discussing the statistical correlations between the outcomes, when an arbitrary sequence of observables are measured, it is necessary to generalize the conventional von Neumann-Lueders collapse postulate to observables with a continuous spectrum. It is shown that the standard prescription in conventional quantum theory for the joint probabilities of compatible observables is sufficient to characterize, more or less completely, the appropriate 'generalized collapse postulate' which associates with each observable a unique 'finitely additive expectation valued measure'. An interesting feature of the collapse associated with observables with continuous spectra, which again follows from the basic principles of conventional quantum theory, is that it must be formulated in terms of the so-called non-normal conditional expectations, which implies that the joint probabilities associated with successive observations of such observables are not in general sigma-additive. The implications of this non-sigma-additivity on the determination of expectation values, correlation functions etc., are also investigated. It is demonstrated that the basic prescriptions introduced in this paper constitute a natural completion of the framework of conventional quantum theory for discussing the statistics of an arbitrary sequence of observations. (orig.) 891 HJ/orig. 892 CKA

  9. Efficiency and yield spectra of inorganic scintillates

    International Nuclear Information System (INIS)

    Rodnyi, P.A.

    1998-01-01

    Recent developments in the field of energy loss in inorganic scintillators are reviewed. The main parameters, which control the fundamental limit of the scintillator energy efficiency, are determined. It is shown that together with simple cascade processes one should take into account the production of plasmons to estimate the energy efficiency of scintillators or other phosphors excited by an ionizing radiation. Core-to-valence luminescence related to 5pCs→3pCl transitions is investigated in some chlorides: CsCl, KCl, RbCl, NaCl, KCaCl 3 , RbCaCl 3 . The yield spectra of the crystals in the VUV and X-ray regions are also studied. It is shown that the 4pRb-core states are involved in the process of creation of holes in the 5pCs-core band in Rb-based crystals. The formation of holes in the potassium core band acts as a competing process and suppresses the radiative core-to-valence transitions

  10. The Global Signature of Ocean Wave Spectra

    Science.gov (United States)

    Portilla-Yandún, Jesús

    2018-01-01

    A global atlas of ocean wave spectra is developed and presented. The development is based on a new technique for deriving wave spectral statistics, which is applied to the extensive ERA-Interim database from European Centre of Medium-Range Weather Forecasts. Spectral statistics is based on the idea of long-term wave systems, which are unique and distinct at every geographical point. The identification of those wave systems allows their separation from the overall spectrum using the partition technique. Their further characterization is made using standard integrated parameters, which turn out much more meaningful when applied to the individual components than to the total spectrum. The parameters developed include the density distribution of spectral partitions, which is the main descriptor; the identified wave systems; the individual distribution of the characteristic frequencies, directions, wave height, wave age, seasonal variability of wind and waves; return periods derived from extreme value analysis; and crossing-sea probabilities. This information is made available in web format for public use at http://www.modemat.epn.edu.ec/#/nereo. It is found that wave spectral statistics offers the possibility to synthesize data while providing a direct and comprehensive view of the local and regional wave conditions.

  11. Emissive spectra of shock-heated argon

    International Nuclear Information System (INIS)

    Tang Jingyou; Gu Yan; Peng Qixian; Bai Yulin; Li Ping

    2003-01-01

    To study the radiant properties of argon under weak shock compression, an aluminum target filled with gaseous argon at ambient states was impacted by a tungsten alloy projectile which was launched from a two-stage light gun to 2.00 km/s. The radiant signals of single shock-compressed argon were recorded by a six-channel pyrometer and oscilloscopes, which varied with time linearly for the five channels from 405 nm to 700 nm and exponentially for the channel 800 nm, and the corresponding velocity of shock wave was determined to be 4.10 ± 0.09 km/s. By the present experiment, it has been shown that the absorbability of the shock-heated argon is low for visual light and the optical depths of argon gas turn from thin to thick as wavelengths gradually increase. The time-resolved spectra in the rising-front of the radiant signal in the re-shocked argon were recorded by means of an OMA, and strong emissive spectrum bands near 450 nm light-wave length but no linear spectrum were found. The emissive spectrum properties of shock-compression argon were qualitatively explained by the state parameters and ionization degree

  12. [Experimental study on spectra of compressed air microwave plasma].

    Science.gov (United States)

    Liu, Yong-Xi; Zhang, Gui-Xin; Wang, Qiang; Hou, Ling-Yun

    2013-03-01

    Using a microwave plasma generator, compressed air microwave plasma was excited under 1 - 5 atm pressures. Under different pressures and different incident microwave power, the emission spectra of compressed air microwave plasma were studied with a spectra measuring system. The results show that continuum is significant at atmospheric pressure and the characteristic will be weakened as the pressure increases. The band spectra intensity will be reduced with the falling of the incident microwave power and the band spectra were still significant. The experimental results are valuable to studying the characteristics of compressed air microwave plasma and the generating conditions of NO active groups.

  13. Avaliação da comunicação no espectro autístico: interferência da familiaridade no desempenho de linguagem Assessing communication in the autistic spectrum: interference of familiarity in language performance

    Directory of Open Access Journals (Sweden)

    Camila Ramos Moreira

    2010-01-01

    Full Text Available OBJETIVO: Analisar a interferência da familiaridade da situação de avaliação na funcionalidade da comunicação de sujeitos com diagnóstico incluído no Espectro Autístico, buscando o melhor procedimento para avaliação da comunicação desta população. MÉTODOS: Participaram da presente pesquisa 18 sujeitos com diagnóstico incluído nos Distúrbios do Espectro Autístico, com idades entre três anos e 11 meses e 17 anos e 11 meses, com média etária de oito anos e nove meses (DP: 3,6 anos. Inicialmente foi realizada a filmagem da interação de cada participante com sua terapeuta em situação rotineira de avaliação (Situação Familiar, semelhante às sessões semanais de atendimento, e nas sessões seguintes foi realizada outra filmagem de cada sujeito em interação com uma fonoaudióloga não-familiar, com materiais lúdicos pré-determinados (Situação Não-Familiar. Os dados de interação foram transcritos e analisados e as variáveis foram selecionadas a partir do protocolo do Perfil Funcional da Comunicação (PFC. RESULTADOS: A comparação entre as situações demonstrou diferença apenas para quatro variáveis (23%, dentre as dezessete analisadas; três dessas mostraram resultado superior na Situação Familiar: atos comunicativos expressados por minuto, número de respostas e porcentagem de utilização da função comunicativa Não-Focalizada, e uma delas se mostrou superior na Situação Não-Familiar: porcentagem de utilização da função comunicativa Jogo. CONCLUSÃO: A interferência da familiaridade da situação comunicativa no desempenho comunicativo de sujeitos autistas é mínima, sendo que o procedimento de avaliação nos mesmos moldes da Situação Familiar mostrou-se ligeiramente melhor para a avaliação da comunicação dessa população.PURPOSE: To identify the best technique to assess the communication of autistic spectrum individuals, analyzing the interference of the familiarity of the situation

  14. Indirect measurements of X-ray spectra

    International Nuclear Information System (INIS)

    Mainardi, R.T.

    2006-01-01

    To the effects of measuring the spectral distribution of the radiation emitted by the x-ray tubes and electron accelerators, numerous procedures that are grouped in two big categories exist at the present time: direct and indirect methods. The first ones use high resolution detectors that should be positioned, together with the appropriate collimator, in the direction of the x ray beam. The user should be an expert in the use and correction of the obtained data by the different effects that affect the detector operation such as efficiency and resolution in terms of the energy of the detected radiation. The indirect procedures, although its are more simple to use, its also require a considerable space along the beam to position the ionization chamber and the necessary absorbents to construct by this way the denominated attenuation curve. We will analyze the operation principle of the indirect methods and a new proposal in which such important novelties are introduced as the beam dispersion to avoid to measure along the main beam and that of determination of the attenuation curve in simultaneous form. By this way, with a single shot of the tube, the attenuation curve is measured, being necessary at most a shot of additional calibration to know the relative response of the detectors used in the experimental array. The physical processes involved in the obtaining of an attenuation curve are very well well-known and this it finishes it can be theoretically calculated if the analytic form of the spectrum is supposed well-known. Finally, we will see a spectra reconstruction example with the Kramers parametric form and comparisons with numeric simulations carried out with broadly validated programs as well as the possibility of the use of solid state dosemeters in the obtention of the attenuation curve. (Author)

  15. Use and generation of floor response spectra

    International Nuclear Information System (INIS)

    Ordonez Villalobos, A.

    1983-01-01

    One of the main objectives of the dynamic analysis of the structures of a nuclear power plant is the determination of the dynamic input that these structures transmit to the equipment and substructures they support, usually given as Floor Response Spectra (FRS). A close collaboration and feedback between the different groups that use and develop the FRS, is considered to be a very important factor in order to adapt the scope and content of the FRS to the precision required for a proper analysis or testing of the equipment; not only for the action of simple events but also for multiple combined actions. These aspects should be evaluated not only in the final stages of qualification of the equipment users schedules do not coincide with the schedules of the analysis group that develops the FRS. Different mechanisms of interchange of information and colaboration are suggested in order to optimize the availability, use and production of FRS. In the aspect of FRS generation, different procedures are reviewed including the direct procedures, not only for FRS but also for secondary FRS that are needed for the evaluation of equipment supported on other equipment or subsystems. It is concluded that in many cases, the direct procedures can be developed economically with the advantage that is easy to take into account the variability not only of the transfer function (including damping, stiffness and modal mass ratio). Different probabilities of excedence levels can be stabilized in order to obtain a more realistic dynamic response of the equipment. These last aspects can contribute to a more flexible procedure for the availability and generation of the FRS. (orig./HP)

  16. Specdata: Automated Analysis Software for Broadband Spectra

    Science.gov (United States)

    Oliveira, Jasmine N.; Martin-Drumel, Marie-Aline; McCarthy, Michael C.

    2017-06-01

    With the advancement of chirped-pulse techniques, broadband rotational spectra with a few tens to several hundred GHz of spectral coverage are now routinely recorded. When studying multi-component mixtures that might result, for example, with the use of an electrical discharge, lines of new chemical species are often obscured by those of known compounds, and analysis can be laborious. To address this issue, we have developed SPECdata, an open source, interactive tool which is designed to simplify and greatly accelerate the spectral analysis and discovery. Our software tool combines both automated and manual components that free the user from computation, while giving him/her considerable flexibility to assign, manipulate, interpret and export their analysis. The automated - and key - component of the new software is a database query system that rapidly assigns transitions of known species in an experimental spectrum. For each experiment, the software identifies spectral features, and subsequently assigns them to known molecules within an in-house database (Pickett .cat files, list of frequencies...), or those catalogued in Splatalogue (using automatic on-line queries). With suggested assignments, the control is then handed over to the user who can choose to accept, decline or add additional species. Data visualization, statistical information, and interactive widgets assist the user in making decisions about their data. SPECdata has several other useful features intended to improve the user experience. Exporting a full report of the analysis, or a peak file in which assigned lines are removed are among several options. A user may also save their progress to continue at another time. Additional features of SPECdata help the user to maintain and expand their database for future use. A user-friendly interface allows one to search, upload, edit or update catalog or experiment entries.

  17. Lyman Limit Absorbers in GALEX Spectra

    Science.gov (United States)

    Williger, Gerard M.; Haberzettl, Lutz G.; Ribaudo, Joseph; Kuchner, Marc J.; Burchett, Joseph; Clowes, Roger G.; Lauroesch, James T.; Mills, Brianna; Borden, Jeremy

    2018-01-01

    We describe the method and early results for crowdsourcing a search for low-redshift partial and complete Lyman Limit Systems (pLLSs and LLSs) in the GALEX spectral archive. LLSs have been found in large numbers at z>3 and traced to lower redshift through a relatively small number of QSO spectra from spaced-based telescopes. From a sample of 44 pLLSs and 11 LLSs at 0.1 = -0.32 +/- 0.07 and the low-metallicity portion centered at = -1.87 +/- 0.11.The GALEX spectral archive offers a vast dataset potentially containing hundreds of LLSs, which may be leveraged to search for such a bimodality and track its evolution within the unconstrained near-UV gap at 1data coverage and signal-to-noise ratio are highly variable, which hampers an automated search. We have therefore begun crowdsourcing a subset of the GALEX archive for LLSs and pLLSs via a Zooniverse project. Initially, undergraduate physics majors are performing a pilot project before releasing to citizen scientists in the public at large. We will then vet candidate systems and estimate column densities in a follow-up analysis. Upon assessing the accuracy of the physics majors’ identifications, the results will be used to devise a larger program with the help of the general public. The resulting data set would then provide the best available link between the HST-selected far-UV and ground-based pLLS+LLS samples and provide an ideal sample for consequent metallicity determinations.

  18. BASACF, Integral Neutron Spectra Adjustment and Dosimetry

    International Nuclear Information System (INIS)

    Tichy, Milos

    1996-01-01

    1 - Description of program or function: Adjustment of a neutron spectrum based on integral detector measurements and calculation of an integral dosimetric quantity (integral flux, d.p.a., dose equivalent) and its variance. The program requires measured data (activities and their covariance matrix) and a priori information (spectrum, dosimetry cross sections, integral quantity conversion factor and their covariance matrices). All a priori covariance matrices can be read in from a file prepared by some other code or can be generated by means of three different methods (by subroutines included in the program). A subroutine which can normalize the a priori flux to measured data is also included. The program provides also adjusted dosimetry cross sections (with covariance matrix) so that it can be used for an adjustment of cross sections (or response functions of e.g. Bonner balls) by measurements in well-known neutron spectra. 2 - Method of solution: Bayesian theorem on conditional probability applied to linearized relation between activities, dosimetry cross sections and flux. All probability distributions are supposed to be normal and this supposition leads to minimizing of the same functional as least squares method (STAY'SL). This task is solved by a covariance filter method which avoids any matrix inversion and is numerically robust and stable. 3 - Restrictions on the complexity of the problem: This version can use 45 energy groups and 5 detectors and occupies 310 kB of main memory. This restriction can be modified according to available memory. The covariance matrix of activities is supposed diagonal. A solution is produced for any set of input data but in the case of non-consistent data, when measured activities do not match the a priori flux, the solution is not very meaningful

  19. Measuring Transmission Spectra from the Ground

    Science.gov (United States)

    Jordan, Andres; Espinoza, Nestor; Eyheramendy, Susana

    2015-08-01

    Transmission spectroscopy allows study of the atmospheres of exoplanets without the need of spatially resolving them from their parent stars and is one of the most valuable follow-up possibilities offered by transiting systems. The measurement of a transmission spectrum, i.e. the apparent planetary size in units in the stellar radius as a function of wavelength, is conceptually simple, but the expected features that need to be discerned are on the order of one part in a thousand or less, and need to be extracted against a background of (potentially correlated) noise and systematic effects with amplitudes greatly exceeding that of the sought signal. In this talk I will describe how we have tackled the estimation of transmission spectra in a ground based survey we are carrying out with IMACS at Las Campanas Observatory, the Arizona-CfA-Catolica Exoplanet Spectroscopy Survey. Our treatment assumes an additive model consisting of the signal, common systematics and one of a set of stochastic processes with different memory characteristics for the noise. Common systematics are estimated from comparison stars using principal component analysis and the model parameter posterior distributions are estimated using MCMC. Model comparison is used to let the data select the model with the most appropriate noise component. I will illustrate the performance of our approach, and discuss possible avenues of improvement. I will also illustrate the importance of potential biases arising from our incomplete knowledge of stellar properties. In particular, I will show that limb darkening assumptions can limit the accuracy of our estimates of planetary radii above the achievable precisions in regimes currently being probed.

  20. Theoretical modelling of actinide spectra in solution

    International Nuclear Information System (INIS)

    Danilo, Cecile

    2009-01-01

    The framework of this PhD is the interpretation of Nuclear Magnetic Relaxation Dispersion experiments performed on solvated U"4"+, NpO_2"+ and PuO_2"2"+, which all have a f"2 configuration. Unexpectedly the two actinyl ions have a much higher relaxivity than U"4"+,. One possible explanation is that the electronic relaxation rate is faster for Uranium(IV) than for the actinyl ions. We address this problem by exploring the electronic spectrum of the three compounds in gas phase and in solution with a two-step SOCI (Spin-Orbit Configuration-Interaction) method. The influence of electron correlation (treated in the first step) and spin-orbit relaxation effects (considered in the second step) has been discussed thoroughly. Solvent effects have been investigated as well. Another issue that has been questioned is the accuracy of Density Functional Theory for the study of actinide species. This matter has been discussed by comparing its performance to wave-function based correlated methods. The chemical problem chosen was the water exchange in [UO_2"2"+ (H_2O)_5]. We looked at the associative and at the dissociative mechanisms using a model with one additional water in the second hydration sphere. The last part of the thesis dealt with the spectroscopy of coordinated Uranyl(V). Absorption spectrum of Uranyl(V) with various ligands has been recorded. The first sharp absorption bands in the Near-Infrared region were assigned to the Uranium centered 5f-5f transitions, but uncertainties remained for the assignment of transitions observed in the Visible region. We computed the spectra of naked UO_2"+ and [UO_2(CO_3)_3]"5"- to elucidate the spectral changes induced by the carbonate ligands. (author) [fr