Optical emission spectrographic analysis of thulium oxide for rare earth impurities

International Nuclear Information System (INIS)

Chandola, L.C.; Khanna, P.P.; Dixit, V.C.

1988-01-01

An optical emission spectrographic method has been developed for the analysis of high purity thulium oxide to determine rare earth elements Er, Yb, Lu and Y. A 1200 groove/mm grating blazed at 3300 A is used to record the spectrum on Kodak SA-1 photographic plates after the excitation of the graphite-sample (1:1) mixture in DC arc. The determination range is 0.008 per cent to 0.1 per cent and the relative standard deviation is 17.6 per cent. (author). 15 refs., 5 tables, 5 figs

Usabilidad en aplicaciones móviles

Directory of Open Access Journals (Sweden)

Juan Gabriel Enriquez

2014-06-01

Full Text Available La usabilidad es considerada uno de los factores más importantes dentro de la calidad de un producto de software. Debido a esto es de interés poder contar con metodologías para medir la usabilidad de las aplicaciones. Los métodos de análisis de usabilidad que actualmente se utilizan, métodos clásicos, fueron desarrollados para aplicaciones de escritorio. Con la aparición, el uso masivo y el crecimiento de los dispositivos móviles, especialmente los Smartphones, la medición de usabilidad en aplicaciones móviles se tornó un tema de investigación. Los métodos y métricas actualmente utilizados para medir usabilidad pueden no ser directamente aplicables a este tipo de productos. Los estudios de usabilidad se han efectuado sobre diferentes contextos, recientemente se empezó a considerar la usabilidad en un contexto móvil. Este trabajo examina los métodos y las métricas utilizados para medir usabilidad y pretende analizar que desafíos existen al momento de realizar pruebas de usabilidad en aplicaciones móviles, donde el contexto que cambia continuamente pasa a tener un rol preponderante.

Using commercial amateur astronomical spectrographs

CERN Document Server

Hopkins, Jeffrey L

2014-01-01

Amateur astronomers interested in learning more about astronomical spectroscopy now have the guide they need. It provides detailed information about how to get started inexpensively with low-resolution spectroscopy, and then how to move on to more advanced  high-resolution spectroscopy. Uniquely, the instructions concentrate very much on the practical aspects of using commercially-available spectroscopes, rather than simply explaining how spectroscopes work. The book includes a clear explanation of the laboratory theory behind astronomical spectrographs, and goes on to extensively cover the practical application of astronomical spectroscopy in detail. Four popular and reasonably-priced commercially available diffraction grating spectrographs are used as examples. The first is a low-resolution transmission diffraction grating, the Star Analyser spectrograph. The second is an inexpensive fiber optic coupled bench spectrograph that can be used to learn more about spectroscopy. The third is a newcomer, the ALPY ...

Optimization of a space spectrograph main frame and frequency response analysis of the frame

Science.gov (United States)

Zhang, Xin-yu; Chen, Zhi-yuan; Yang, Shi-mo

2009-07-01

A space spectrograph main structure is optimized and examined in order to satisfy the space operational needs. The space spectrograph will be transported into its operational orbit by the launch vehicle and it will undergo dynamic environment in the spacecraft injection period. The unexpected shocks may cause declination of observation accuracy and even equipment damages. The main frame is one of the most important parts because its mechanical performance has great influence on the operational life of the spectrograph, accuracy of observation, etc. For the reason of cost reduction and stability confirming, lower weight and higher structure stiffness of the frame are simultaneously required. Structure optimization was conducted considering the initial design modal analysis results. The base modal frequency raised 10.34% while the whole weight lowered 8.63% compared to the initial design. The purpose of this study is to analyze the new design of main frame mechanical properties and verify whether it can satisfy strict optical demands under the dynamic impact during spacecraft injection. For realizing and forecasting the frequency response characteristics of the main structure in mechanical environment experiment, dynamic analysis of the structure should be performed simulating impulse loads from the bottom base. Therefore, frequency response analysis (FRA) of the frame was then performed using the FEA software MSC.PATRAN/NASTRAN. Results of shock response spectrum (SRS) responses from the base excitations were given. Stress and acceleration dynamic responses of essential positions in the spacecraft injection course were also calculated and spectrometer structure design was examined considering stiffness / strength demands. In this simulation, maximum stresses of Cesic material in two acceleration application cases are 45.1 and 74.1 MPa, respectively. They are all less than yield strengths. As is demonstrated from the simulation, strength reservation of the frame is

Tomographic extreme-ultraviolet spectrographs: TESS.

Science.gov (United States)

Cotton, D M; Stephan, A; Cook, T; Vickers, J; Taylor, V; Chakrabarti, S

2000-08-01

We describe the system of Tomographic Extreme Ultraviolet (EUV) SpectrographS (TESS) that are the primary instruments for the Tomographic Experiment using Radiative Recombinative Ionospheric EUV and Radio Sources (TERRIERS) satellite. The spectrographs were designed to make high-sensitivity {80 counts/s)/Rayleigh [one Rayleigh is equivalent to 10(6) photons/(4pi str cm(2)s)}, line-of-sight measurements of the oi 135.6- and 91.1-nm emissions suitable for tomographic inversion. The system consists of five spectrographs, four identical nightglow instruments (for redundancy and added sensitivity), and one instrument with a smaller aperture to reduce sensitivity and increase spectral resolution for daytime operation. Each instrument has a bandpass of 80-140 nm with approximately 2- and 1-nm resolution for the night and day instruments, respectively. They utilize microchannel-plate-based two-dimensional imaging detectors with wedge-and-strip anode readouts. The instruments were designed, fabricated, and calibrated at Boston University, and the TERRIERS satellite was launched on 18 May 1999 from Vandenberg Air Force Base, California.

Aplicaciones farmacéuticas del quitosano

OpenAIRE

Montalvo Aique, Pedro Luis; Montalvo Aique, Pedro Luis; Montalvo Aique, Pedro Luis

2009-01-01

Entre los temas que se trataran en este informe es sobre el quitosano como una breve reseña histórica donde hablaré sobre las fuentes y métodos de obtención de la quitina, caracterización del quitosano, aplicaciones generales del quitosano, derivados del quitosano de mayor importancia, modificación química del quitosano, quitosanos en diversas formas y las aplicaciones farmacéuticas del quitosano como la liberación de fármacos. La actividad industrial de procesado de los productos de la pe...

Solar glint suppression in compact planetary ultraviolet spectrographs

Science.gov (United States)

Davis, Michael W.; Cook, Jason C.; Grava, Cesare; Greathouse, Thomas K.; Gladstone, G. Randall; Retherford, Kurt D.

2015-08-01

Solar glint suppression is an important consideration in the design of compact photon-counting ultraviolet spectrographs. Southwest Research Institute developed the Lyman Alpha Mapping Project for the Lunar Reconnaissance Orbiter (launch in 2009), and the Ultraviolet Spectrograph on Juno (Juno-UVS, launch in 2011). Both of these compact spectrographs revealed minor solar glints in flight that did not appear in pre-launch analyses. These glints only appeared when their respective spacecraft were operating outside primary science mission parameters. Post-facto scattered light analysis verifies the geometries at which these glints occurred and why they were not caught during ground testing or nominal mission operations. The limitations of standard baffle design at near-grazing angles are discussed, as well as the importance of including surface scatter properties in standard stray light analyses when determining solar keep-out efficiency. In particular, the scattered light analysis of these two instruments shows that standard "one bounce" assumptions in baffle design are not always enough to prevent scattered sunlight from reaching the instrument focal plane. Future builds, such as JUICE-UVS, will implement improved scattered and stray light modeling early in the design phase to enhance capabilities in extended mission science phases, as well as optimize solar keep out volume.

Uso de las TIC en el Trastorno de Espectro Autista: aplicaciones

Directory of Open Access Journals (Sweden)

Susana García Guillén

2016-11-01

Full Text Available A través de este trabajo de investigación se ha realizado una revisión bibliográfica detallada sobre el uso de las aplicaciones y el autismo. En primer lugar se ha realizado un recorrido histórico a través del concepto autismo y las aplicaciones disponibles. Los objetivos generales han sido conocer la evolución del término autismo, conocer la bibliografía relacionada con el autismo y el uso de aplicaciones, así como las aplicaciones disponibles para niños autistas. A través de las dos bases de datos, dialnet y google aplicaciones, se presenta la revisión sistemática realizada. Como resultado, se han seleccionado cuatro artículos a través de la base de datos dialnet y treinta y cinco aplicaciones. Las Tecnologías de la Información y Comunicación (TIC ofrecen a los usuarios diferentes beneficios como la estimulación de los sentidos y el desarrollo de habilidades que le ayuden a la integración, mejorando sus habilidades sociales para lograr una mejor relación con sus iguales.

Usabilidad en aplicaciones móviles

OpenAIRE

Juan Gabriel Enriquez; Sandra Isabel Casas

2014-01-01

La usabilidad es considerada uno de los factores más importantes dentro de la calidad de un producto de software. Debido a esto es de interés poder contar con metodologías para medir la usabilidad de las aplicaciones. Los métodos de análisis de usabilidad que actualmente se utilizan, métodos clásicos, fueron desarrollados para aplicaciones de escritorio. Con la aparición, el uso masivo y el crecimiento de los dispositivos móviles, especialmente los Smartphones, la medición de usabilidad en ap...

Aplicaciones industriales de la tecnología nuclear

OpenAIRE

Vargas, Celso

2013-01-01

Las aplicaciones industriales de la tecnología nuclear son muydiversas a nivel mundial. En Costa Rica se ha comenzado a introducir este tipo de tecnología para evaluar y mejorar diferentes procesos industriales. Estas aplicaciones se clasifican en dos o en tres categorías, según el criterio utilizado. Están los sistemasde control nucleónico, el perfilaje gamma y los radiotrazadores.

Sky Subtraction with Fiber-Fed Spectrograph

Science.gov (United States)

Rodrigues, Myriam

2017-09-01

"Historically, fiber-fed spectrographs had been deemed inadequate for the observation of faint targets, mainly because of the difficulty to achieve high accuracy on the sky subtraction. The impossibility to sample the sky in the immediate vicinity of the target in fiber instruments has led to a commonly held view that a multi-object fibre spectrograph cannot achieve an accurate sky subtraction under 1% contrary to their slit counterpart. The next generation of multi-objects spectrograph at the VLT (MOONS) and the planed MOS for the E-ELT (MOSAIC) are fiber-fed instruments, and are aimed to observed targets fainter than the sky continuum level. In this talk, I will present the state-of-art on sky subtraction strategies and data reduction algorithm specifically developed for fiber-fed spectrographs. I will also present the main results of an observational campaign to better characterise the sky spatial and temporal variations ( in particular the continuum and faint sky lines)."

The deterministic optical alignment of the HERMES spectrograph

Science.gov (United States)

Gers, Luke; Staszak, Nicholas

2014-07-01

The High Efficiency and Resolution Multi Element Spectrograph (HERMES) is a four channel, VPH-grating spectrograph fed by two 400 fiber slit assemblies whose construction and commissioning has now been completed at the Anglo Australian Telescope (AAT). The size, weight, complexity, and scheduling constraints of the system necessitated that a fully integrated, deterministic, opto-mechanical alignment system be designed into the spectrograph before it was manufactured. This paper presents the principles about which the system was assembled and aligned, including the equipment and the metrology methods employed to complete the spectrograph integration.

Optical emission spectrographic analysis of lutetium oxide for rare earth impurities

International Nuclear Information System (INIS)

Chandola, L.C.; Dixit, V.S.

1986-01-01

An optical emission spectrographic (OES) method has been developed for the analysis of high purity lutetium oxide to determine rare earths Er, Tm, Yb and Y. The spectra are excited by a d.c. arc run at 10 A current after mixing the sample with graphite buffer in the weight ratio 1:1. A 1200 grooves/mm grating blazed at 3300 A is used for dispersion and a Kodak SA-1 plate for recording the spectrum. The detection limit is 0.001 per cent for Tm, Yb and Y while it is 0.005 per cent for Er. The relative standard deviation of the method is ± 13.4 per cent. (author)

Aplicaciones multimedia para rehabilitación cognitiva

OpenAIRE

Ortega Bastida, Javier

2016-01-01

Diseño de aplicaciones multimedia que posibilitan la rehabilitación de los pacientes a través de aplicaciones de realidad virtual e interfaces 3D: manipulación virtual de entidades, texto predictivo y dibujo guiado sobre entrono integrado para sistema multisensor para rehabilitación e interacción de personas con discapacidad, tanto motora, como cognitiva. El sistema permite la realización de terapias utilizando distintos modos de interacción hombre-máquina, posibilitando múltiples modos de in...

NRES: The Network of Robotic Echelle Spectrographs

Science.gov (United States)

Siverd, Robert; Brown, Tim; Henderson, Todd; Hygelund, John; Barnes, Stuart; de Vera, Jon; Eastman, Jason; Kirby, Annie; Smith, Cary; Taylor, Brook; Tufts, Joseph; van Eyken, Julian

2018-01-01

Las Cumbres Observatory (LCO) is building the Network of Robotic Echelle Spectrographs (NRES), which will consist of four (up to six in the future) identical, optical (390 - 860 nm) high-precision spectrographs, each fiber-fed simultaneously by up to two 1-meter telescopes and a Thorium-Argon calibration source. We plan to install one at up to 6 observatory sites in the Northern and Southern hemispheres, creating a single, globally-distributed, autonomous spectrograph facility using up to ten 1-m telescopes. Simulations suggest we will achieve long-term radial velocity precision of 3 m/s in less than an hour for stars brighter than V = 11 or 12 once the system reaches full capability. Acting in concert, these four spectrographs will provide a new, unique facility for stellar characterization and precise radial velocities.Following a few months of on-sky evaluation at our BPL test facility, the first spectrograph unit was shipped to CTIO in late 2016 and installed in March 2017. After several more months of additional testing and commissioning, regular science operations began with this node in September 2017. The second NRES spectrograph was installed at McDonald Observatory in September 2017 and released to the network after its own brief commissioning period, extending spectroscopic capability to the Northern hemisphere. The third NRES spectrograph was installed at SAAO in November 2017 and released to our science community just before year's end. The fourth NRES unit shipped in October and is currently en route to Wise Observatory in Israel with an expected release to the science community in early 2018.We will briefly overview the LCO telescope network, the NRES spectrograph design, the advantages it provides, and development challenges we encountered along the way. We will further discuss real-world performance from our first three units, initial science results, and the ongoing software development effort needed to automate such a facility for a wide array of

Spectrographic analysis of uranium-molybdenum alloys; Analisis espectrografico de aleaciones uranio-molibdeno

Energy Technology Data Exchange (ETDEWEB)

Roca, M

1967-07-01

A spectrographic method of analysis has been developed for uranium-molybdenum alloys containing up to 10 % Mo. The carrier distillation technique, with gallium oxide and graphite as carriers, is used for the semiquantitative determination of Al, Cr, Fe, Ni and Si, involving the conversion of the samples into oxides. As a consequence of the study of the influence of the molybdenum on the line intensities, it is useful to prepare only one set of standards with 0,6 % MoO{sub 3}. Total burning excitation is used for calcium, employing two sets of standards with 0,6 and 7.5 MoO{sub 3}. (Author) 5 refs.

Seguridad de aplicaciones híbridas para dispositivos móviles

OpenAIRE

Pérez-Pérez, Iván

2014-01-01

El presente Trabajo Fin de Máster consiste en un estudio comparativo de las distintas soluciones para el desarrollo de aplicaciones híbridas para móviles (esto es, aplicaciones diseñadas con tecnologías web, pero empaquetadas en contenedores nativos) desde el punto de vista de la seguridad. Se realizará un análisis sobre el estado actual de las aplicaciones híbridas y las tecnologías que se emplean en la creación de las mismas. Se desarrollará una prueba de concepto usando u...

Reconfigurando aplicaciones multi-cloud con líneas de producto software dinámicas

OpenAIRE

Cubo, Javier; Gámez,Nadia; Pimentel, Ernesto; Fuentes, Lidia

2016-01-01

La reconfiguración dinámica de aplicaciones multi-cloud es un reto complejo aún no suficientemente explorado. En estos entornos las aplicaciones o sus módulos pueden estar desplegados en diferentes proveedores. Por lo tanto, reconfigurar en tiempo de ejecución estas aplicaciones puede requerir la modificación de la distribución en múltiples y heterogéneos proveedores. Obtener la nueva distribución para que sigan funcionando correctamente las aplicaciones no es una tarea senc...

Micro photometer`s automation for quantitative spectrograph analysis; Automatizacion de un microfotometro para analisis espectrografico cuantitativo

Energy Technology Data Exchange (ETDEWEB)

Gutierrez E, C Y.A.

1997-12-31

A Microphotometer is used to increase the sharpness of dark spectral lines. Analyzing these lines one sample content and its concentration could be determined and the analysis is known as Quantitative Spectrographic Analysis. The Quantitative Spectrographic Analysis is carried out in 3 steps, as follows. 1. Emulsion calibration. This consists of gauging a photographic emulsion, to determine the intensity variations in terms of the incident radiation. For the procedure of emulsion calibration an adjustment with square minimum to the data obtained is applied to obtain a graph. It is possible to determine the density of dark spectral line against the incident light intensity shown by the microphotometer. 2. Working curves. The values of known concentration of an element against incident light intensity are plotted. Since the sample contains several elements, it is necessary to find a work curve for each one of them. 3. Analytical results. The calibration curve and working curves are compared and the concentration of the studied element is determined. The automatic data acquisition, calculation and obtaining of resulting, is done by means of a computer (PC) and a computer program. The conditioning signal circuits have the function of delivering TTL levels (Transistor Transistor Logic) to make the communication between the microphotometer and the computer possible. Data calculation is done using a computer programm.

Seguridad de las aplicaciones web

OpenAIRE

Luján Mora, Sergio

2016-01-01

Conferencia "Seguridad de las aplicaciones web" impartida en las III Jornadas Informáticas - UTE 2016 en la Facultad de Ciencias de la Ingeniería e Industrias de la Universidad Tecnológica Equinoccial (Quito, Ecuador) el 5 de julio de 2016.

Magnetic spectrograph for the Holifield heavy ion research facility

International Nuclear Information System (INIS)

Ford, J.L.C. Jr.; Enge, H.A.; Erskine, J.R.; Hendrie, D.L.; LeVine, M.J.

1977-01-01

The need for a new generation magnetic spectrograph for the Holifield Heavy Ion Research Facility is discussed. The advantages of a magnetic spectrograph for heavy ion research are discussed, as well as some of the types of experiments for which such an instrument is suited. The limitations which the quality of the incident beam, target and spectrograph itself impose on high resolution heavy ion measurements are discussed. Desired features of an ideal new spectrograph are: (1) intrinsic resolving power E/ΔE greater than or equal to 3000; (2) maximum solid angle greater than or equal to 20 msr; (3) dispersion approx. 4-8m; (4) maximum energy interval approx. 30%; and (5) mass-energy product greater than or equal to 200. Various existing and proposed spectrographs are compared with the specifications for a new heavy ion magnet design

Second generation spectrograph for the Hubble Space Telescope

Science.gov (United States)

Woodgate, B. E.; Boggess, A.; Gull, T. R.; Heap, S. R.; Krueger, V. L.; Maran, S. P.; Melcher, R. W.; Rebar, F. J.; Vitagliano, H. D.; Green, R. F.; Wolff, S. C.; Hutchings, J. B.; Jenkins, E. B.; Linsky, J. L.; Moos, H. W.; Roesler, F.; Shine, R. A.; Timothy, J. G.; Weistrop, D. E.; Bottema, M.; Meyer, W.

1986-01-01

The preliminary design for the Space Telescope Imaging Spectrograph (STIS), which has been selected by NASA for definition study for future flight as a second-generation instrument on the Hubble Space Telescope (HST), is presented. STIS is a two-dimensional spectrograph that will operate from 1050 A to 11,000 A at the limiting HST resolution of 0.05 arcsec FWHM, with spectral resolutions of 100, 1200, 20,000, and 100,000 and a maximum field-of-view of 50 x 50 arcsec. Its basic operating modes include echelle model, long slit mode, slitless spectrograph mode, coronographic spectroscopy, photon time-tagging, and direct imaging. Research objectives are active galactic nuclei, the intergalactic medium, global properties of galaxies, the origin of stellar systems, stelalr spectral variability, and spectrographic mapping of solar system processes.

Curved VPH gratings for novel spectrographs

Science.gov (United States)

Clemens, J. Christopher; O'Donoghue, Darragh; Dunlap, Bart H.

2014-07-01

The introduction of volume phase holographic (VPH) gratings into astronomy over a decade ago opened new possibilities for instrument designers. In this paper we describe an extension of VPH grating technology that will have applications in astronomy and beyond: curved VPH gratings. These devices can disperse light while simultaneously correcting aberrations. We have designed and manufactured two different kinds of convex VPH grating prototypes for use in off-axis reflecting spectrographs. One type functions in transmission and the other in reflection, enabling Offnerstyle spectrographs with the high-efficiency and low-cost advantages of VPH gratings. We will discuss the design process and the tools required for modelling these gratings along with the recording layout and process steps required to fabricate them. We will present performance data for the first convex VPH grating produced for an astronomical spectrograph.

Quantitative spectrographic analysis of impurities in antimonium

International Nuclear Information System (INIS)

Brito, J. de; Gomes, R.P.

1978-01-01

An emission spectrographic method is describe for the determination of Ag, Al, As, Be, Bi, Cd, Cr, Cu, Ga, Ni, Pb, Sn, Si, and Zn in high purity antimony metal. The metal sample ia dissolved in nitric acid(1:1) and converted tp oxide by calcination at 900 0 C for one hour. The oxide so obtained is mixed with graphite, which is used as a spectroscopic buffer, and excited by a direct current arc. Many parameters are studied optimum conditions are selected for the determination of the impurities mentioned. The spectrum is photographed in the second order of a 15.000 lines per inch grating and the most sensitive lines for the elements are selected. The impurities are determined in the concentration range of 1 - 0,01% with a precision of approximately 10% [pt

La estructura del fullereno C60 y sus aplicaciones

OpenAIRE

Vasilievna Kharissova, Oxana; Ortiz Méndez, Ubaldo

2002-01-01

Se revisan los datos reportados de una nueva clase de materiales basados en los fullerenos. Se explica la estructura del fullereno C60 y sus compuestos con metales alcalinos, sus propiedades y aplicaciones. Se señala que estos compuestos tienen propiedades de superconducción comparable con la de los tradicionales cupratos. Se indica que esta modificación del carbono puede formar nanotubos que tienen varias aplicaciones prácticas debido a sus propiedades.

Aplicaciones sobre plataformas de redes neuronales en tiempo real

OpenAIRE

Tosini, Marcelo Alejandro; Acosta, Nelson

2003-01-01

El presente trabajo pretende el diseño de una metodología para la construcción de aplicaciones basadas en redes neuronales sobre una plataforma Muren. Las aplicaciones se restringen a sistemas de control y reconocimiento de patrones por imágenes. Se describe la arquitectura del sistema de desarrollo Muren, basado en 2 procesadores ZISC de 78 neuronas cada uno, una FPGA Spartan II, bancos de memoria y lógica adicional de comunicación.

Desarrollo de aplicaciones web

OpenAIRE

Luján Mora, Sergio

2010-01-01

Agradecimientos 1. Introducción a las aplicaciones web 2. Instalación del servidor 3. Diseño de páginas web 4. Formato estructurado de texto: XML 5. Contenido dinámico 6. Acceso a bases de datos: JDBC 7. Servicios web 8. Utilización y mantenimiento 9. Monitorización y análisis Bibliografía GNU Free Documentation License

Lead shielded cells for the spectrographic analysis of radioisotope solutions; Descripcion de un equipo, con recintos blindados, para el analisis espectrografico de soluciones de radioisotopos

Energy Technology Data Exchange (ETDEWEB)

Roca, M; Capdevila, C; Cruz, F de la

1967-07-01

Two lead shielded cells for the spectrochemical analysis of radioisotope samples are described. One of them is devoted to the evaporation of samples before excitation and the other one contains a suitable spectrographic excitation stand for the copper spark technique. A special device makes it possible the easy displacement of the excitation cell on wheels and rails for its accurate and reproducible position as well as its replacement by a glove box for plutonium analysis. In order to guarantee safety the room in which the spectrograph and the source are set up in separated from the active laboratory by a wall with a suitable window. (Author) 1 refs.

Digital TV-echelle spectrograph for simultaneous multielemental analysis using microcomputer control

International Nuclear Information System (INIS)

Davidson, J.B.; Case, A.L.

1980-12-01

A digital TV-echelle spectrograph with microcomputer control was developed for simultaneous multielemental analysis. The optical system is a commercially available unit originally equipped for film and photomultiplier (single element) readout. The film port was adapted for the intensifier camera. The camera output is digitized and stored in a microcomputer-controlled, 512 x 512 x 12 bit memory and image processor. Multiple spectra over the range of 200 to 800 nm are recorded in a single exposure. Spectra lasting from nanoseconds to seconds are digitized and stored in 0.033 s and displayed on a TV monitor. An inexpensive microcomputer controls the exposure, reads and displays the intensity of predetermined spectral lines, and calculates wavelengths of unknown lines. The digital addresses of unknown lines are determined by superimposing a cursor on the TV display. The microcomputer also writes into memory wavelength fiducial marks for alignment of the TV camera

Uso y aplicaciones de drones en minería

OpenAIRE

Sánchez García, Manuel

2017-01-01

Los drones son una tecnología actual y en pleno desarrollo con múltiples aplicaciones pero ¿conocemos todas las posibilidades que nos ofrecen dentro de la minería? Este proyecto pretende dar respuesta a esta pregunta y poner de manifiesto todas las aplicaciones potenciales. Los drones, también conocidos como VANT (Vehículo Aéreo No Tripulado) o UAV (Unmaned Aerial Vehicle), son aeronaves que vuelan sin tripulación, reutilizables, capaz de mantener de manera autónoma un vuelo controlado y ...

Estudio de las aplicaciones de gestión de la red WAN de un operador de telecomunicaciones

OpenAIRE

González Medina, Mariano

2012-01-01

Este proyecto se basa en analizar y estudiar exhaustivamente las aplicaciones de gestión de la red WAN de un operador de telecomunicaciones (OdT). Dichas aplicaciones se dividen en dos fases importantes: provisión y mantenimiento. Aquest projecte es basa en analitzar i estudiar exhaustivament les aplicacions de gestió de la xarxa WAN d'un operador de telecomunicacions (OdT). Aquestes aplicacions es divideixen en dues fases importants: provisió i manteniment.

The spectrographic analysis of inorganic impurities in heavy water

International Nuclear Information System (INIS)

Artaud, J.; Normand, J.; Vie, R.

1961-01-01

Inorganic impurities in heavy water are determined by two spectrographic methods. First is described the copper-spark method which is sensitive and directly applicable, and is particular useful because of the absence of a support. Secondly the graphite impregnation method is given; this is used when the first method is not applicable (determination of copper) and for the alkali metals. For the usual elements, the sensitivity of the copper spark method is of the order of 0,1 μg/ml whereas for the graphite impregnation method the sensitivity is only 0,3 μg/ml. (author) [fr

LRS2: A New Integral Field Spectrograph for the HET

Science.gov (United States)

Tuttle, Sarah E.; Hill, Gary J.; Chonis, Taylor S.; Tonnesen, Stephanie

2016-01-01

Here we present LRS2 (Low Resolution Spectrograph) and highlight early science opportunities with the newly upgraded Hobby Eberly telescope (HET). LRS2 is a four-channel optical wavelength (370nm - 1micron) spectrograph based on two VIRUS unit spectrographs. This fiber-fed integral field spectrograph covers a 12" x 6" field of view, switched between the two units (one blue, and one red) at R~2000. We highlight design elements, including the fundamental modification to grisms (from VPH gratings in VIRUS) to access the higher resolution. We discuss early science opportunities, including investigating nearby "blue-bulge" spiral galaxies and their anomalous star formation distribution.

Evaluación de los Frameworks en el Desarrollo de Aplicaciones Web con Python

OpenAIRE

Jimmy Rolando Molina Ríos; Nancy Magaly Loja Mora; Mariuxi Paola Zea Ordóñez; Erika Lizbeth Loaiza Sojos

2016-01-01

Debido a la creciente interacción de los usuarios con sistemas web, surge la necesidad de combinar las funcionalidades de aplicaciones clásicas de escritorio, con la accesibilidad y bajo costo de la publicación de aplicaciones web; dando origen a la elección del mejor marco de trabajo que se adopte a las necesidades de los desarrolladores. Esta investigación presenta un análisis comparativo de los frameworks que trabajan con el lenguaje Python para el desarrollo de aplicaciones web. Para ello...

Quantitative imaging through a spectrograph. 1. Principles and theory.

NARCIS (Netherlands)

Tolboom, R.A.L.; Dam, N.J.; Meulen, J.J. ter; Mooij, J.M.; Maassen, J.D.M.

2004-01-01

Laser-based optical diagnostics, such as planar laser-induced fluorescence and, especially, Raman imaging, often require selective spectral filtering. We advocate the use of an imaging spectrograph with a broad entrance slit as a spectral filter for two-dimensional imaging. A spectrograph in this

Wavelets y sus aplicaciones

OpenAIRE

Castro, Liliana Raquel; Castro, Silvia Mabel

1995-01-01

Se presenta una introducción a la teorfa de wavelets. Ademas, se da una revisión histórica de cómo fueron introducidas las wavelets para la representación de funciones. Se efectúa una comparación entre la transformada wavelet y la transformada de Fourier. Por último, se presentan también algunas de los múltiples aplicaciones de esta nueva herramienta de análisis armónico.

Mashup d'aplicacions basat en un buscador intel·ligent

OpenAIRE

Sancho Piqueras, Javier

2010-01-01

Mashup de funcionalitats, basat en un cercador intel·ligent, en aquest cas pensat per a cursos, carreres màsters, etc. La finalitat és adjuntar diverses aplicacions amb l'únic propòsit que en aquest cas és un buscador però que també ens permet utilitzar eines per a la connectivitat mitjançant web Services, o xarxes socials. Mashup de funcionalidades, basado en un buscador inteligente, en este caso pensado para cursos, carreras másters, etc. La finalidad es juntar diversas aplicaciones con ...

The Mitchell Spectrograph: Studying Nearby Galaxies with the VIRUS Prototype

Directory of Open Access Journals (Sweden)

Guillermo A. Blanc

2013-01-01

Full Text Available The Mitchell Spectrograph (a.k.a. VIRUS-P on the 2.7 m Harlan J. Smith telescope at McDonald Observatory is currently the largest field of view (FOV integral field unit (IFU spectrograph in the world (1.7′×1.7′. It was designed as a prototype for the highly replicable VIRUS spectrograph which consists of a mosaic of IFUs spread over a 16′ diameter FOV feeding 150 spectrographs similar to the Mitchell. VIRUS will be deployed on the 9.2 meter Hobby-Eberly Telescope (HET and will be used to conduct the HET Dark Energy Experiment (HETDEX. Since seeing first light in 2007 the Mitchell Spectrograph has been widely used, among other things, to study nearby galaxies in the local universe where their internal structure and the spatial distribution of different physical parameters can be studied in great detail. These observations have provided important insight into many aspects of the physics behind the formation and evolution of galaxies and have boosted the scientific impact of the 2.7 meter telescope enormously. Here I review the contributions of the Mitchell Spectrograph to the study of nearby galaxies, from the investigation the spatial distribution of dark matter and the properties of supermassive black holes, to the studies of the process of star formation and the chemical composition of stars and gas in the ISM, which provide important information regarding the formation and evolution of these systems. I highlight the fact that wide field integral field spectrographs on small and medium size telescopes can be powerful cost effective tools to study the astrophysics of galaxies. Finally I briefly discuss the potential of HETDEX for conducting studies on nearby galaxies. The survey parameters make it complimentary and competitive to ongoing and future surveys like SAMI and MANGA.

Spectrographic analysis of uranium-based alloys; Analyse spectrographique d'alliages a base d'uranium

Energy Technology Data Exchange (ETDEWEB)

Baudin, G.; Blum, P.

1959-07-01

The authors describe a spectrographic method for dosing cobalt in cobalt-uranium alloys with cobalt content from 0.05 to 10 per cent. They describe sample preparation, alloy solution, spectrographic conditions, and photometry operations. In a second part, they address the dosing of boron in uranium borides. They implement the so-called 'porous cup' method. Boride is dissolved by fusion with Co{sub 3}-NaK [French] Uranium-Cobalt: il est decrit une methode spectrographique de dosage de cobalt dans des alliages cobalt-uranium pour des teneurs de 0,05 pour cent a 10 pour cent de Co. On opere sur solution avec le fer comme standard interne. Borure d'Uranium: ici encore on opere par la methode dite 'porous cup', le fer etant conserve comme standard interne. Le borure est mis en solution par fusion avec Co{sub 3}NaK. (auteurs)

Identificación de prestaciones en nuevas aplicaciones de vidrio estructural

OpenAIRE

Abascal Capilla, Alba

2016-01-01

El presente Trabajo Fin de Grado consiste en la identificación de las prestaciones que se deben cumplir de cara al diseño de los elementos de vidrio estructural para aplicaciones actuales, novedosas e innovadoras. Para la identificación de las prestaciones se comienza por una evaluación del estado actual del vidrio; posteriormente se hace una selección de obras innovadoras en aplicaciones existentes con vidrio estructural (fachadas, cubiertas, barandillas, suelos, escaleras, pilares y viga...

Creación de un Framework de desarrollo de aplicaciones para la web con lenguaje PHP

OpenAIRE

Henríquez Chavarría, José Antonio

2013-01-01

El desarrollo de Frameworks, para desarrollo de aplicaciones en ambiente web, ha tenido un notable aumento, en los últimos años, debido a la necesidad de crear aplicaciones web y la urgencia de muchos por conseguir desarrollos con un ciclo de vida rápido, de forma que actualmente muchos desarrolladores de software requieren herramientas como un Framewok para lograr programar sus aplicaciones y dar seguimiento para siguientes versiones. El presente proyecto se plantea como una alternativa s...

Improved Emission Spectrographic Facility

International Nuclear Information System (INIS)

Goergen, C.R.; Lethco, A.J.; Hosken, G.B.; Geckeler, D.R.

1980-10-01

The Savannah River Plant's original Emission Spectrographic Laboratory for radioactive samples had been in operation for 25 years. Due to the deteriorated condition and the fire hazard posed by the wooden glove box trains, a project to update the facility was funded. The new laboratory improved efficiency of operation and incorporated numerous safety and contamination control features

Princeton Cyclotron QDDD spectrograph system

International Nuclear Information System (INIS)

Kouzes, R.T.

1985-01-01

A review of experiments involving the Princeton Quadrupole-Dipole-Dipole- Dipole (QDDD) spectrograph is given. The QDDD is a high resolution, large solid angle device which is combined with the azymuthally varying field (AVF) cyclotron. Some reactions involving 3 He beams are discussed

First light results from the Hermes spectrograph at the AAT

NARCIS (Netherlands)

Sheinis, A.; Barden, S.; Birchall, M.; Carollo, D.; Bland-Hawthorn, J.; Brzeski, J.; Case, S.; Cannon, R.; Churilov, V.; Couch, W.; Dean, R.; De Silva, G.; D'Orazi, V.; Farrell, T.; Fiegert, K.; Freeman, K.; Frost, G.; Gers, L.; Goodwin, M.; Gray, D.; Heald, R.; Heijmans, J.A.C.; Jones, D.; Keller, S.; Klauser, U.; Kondrat, Y.; Lawrence, J.; Lee, S.; Mali, S.; Martell, S.; Mathews, D.; Mayfield, D.; Miziarski, S.; Muller, R.; Pai, N.; Patterson, R.; Penny, E.; Orr, D.; Shortridge, K.; Simpson, J.; Smedley, S.; Smith, G.; Stafford, D.; Staszak, N.; Vuong, M.; Waller, L.; Wylie de Boer, E.; Xavier, P.; Zheng, J.; Zhelem, R.; Zucker, D.

2014-01-01

The High Efficiency and Resolution Multi Element Spectrograph, HERMES is an facility-class optical spectrograph for the AAT. It is designed primarily for Galactic Archeology [21], the first major attempt to create a detailed understanding of galaxy formation and evolution by studying the history of

Spectrographic analysis of plutonium (1960); L'analyse spectrographique du plutonium (1960)

Energy Technology Data Exchange (ETDEWEB)

Artaud, J; Chaput, M; Robichet, J [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

1960-07-01

Various possibilities for the spectrographic determination of impurities in plutonium are considered. The application of the 'copper spark' method, of sparking on graphite and of fractional distillation in the arc are described and discussed in some detail (apparatus, accessories, results obtained). (author) [French] On examine diverses possibilites pour le dosage spectrographique des impuretes dans le plutonium. On decrit et discute plus particulierement de l'application des methodes 'copper spark', de l'etincelage sur graphite et de la distillation fractionnee dans l'arc (montages, accessoires, resultats obtenus). (auteur)

Evaluation of spectrographic standards for the carrier-distillation analysis of PuO2

International Nuclear Information System (INIS)

Martell, C.J.; Myers, W.M.

1976-05-01

Three plutonium metals whose impurity contents have been accurately determined are used to evaluate spectrographic standards. Best results are obtained when (1) highly impure samples are diluted, (2) the internal standard, cobalt, is used, (3) a linear curve is fitted to the standard data that bracket the impurity concentration, and (4) plutonium standards containing 22 impurities are used

Design of a simple magnetic spectrograph for the Karlsruhe isochronous cyclotron

International Nuclear Information System (INIS)

Gils, H.J.

1980-12-01

The ion-optical design of a simple magnetic spectrograph for studies of nuclear reactions on the Karlsruhe cyclotron is described. The spectrograph allows to determine the nuclear charge, the mass number, the reaction angle and the impulse (energy) of charged particles, which are emitted from the target. The spectrographs possibilities cover an appropriate range of likely nuclear reactions which are induced by light and heavy particles up to mass number A=20 and energies of 26 MeV per nucleon [de

Resinas acetálicas: diversas aplicaciones en odontoestomatología

OpenAIRE

Puigpelat Martí, Ana M.; Casanellas Bassols, Josep M. (Josep Maria)

1994-01-01

La resina acetálica o Polioxime­tileno (POM) es un nuevo material estético de reciente aplicación en el campo de la Odontoestomatolo­gía. En este artículo presentamos al­gunas de las aplicaciones donde la estética desempeña una función importante. Una de las aplicaciones de las re­sinas acetálicas es el campo de la Prótesis Parcial Removible, cuan­do queremos sustituir los retene­dores vestibulares convencionales (metálicos) por retenedores más es­téticos. Otra posible aplicación puede ser la...

Auroral spectrograph data annals of the international geophysical year, v.25

CERN Document Server

Carrigan, Anne; Norman, S J

1964-01-01

Annals of the International Geophysical Year, Volume 25: Auroral Spectrograph Data is a five-chapter text that contains tabulations of auroral spectrograph data. The patrol spectrograph built by the Perkin-Elmer Corporation for the Aurora and Airglow Program of the IGY is a high-speed, low-dispersion, automatic instrument designed to photograph spectra of aurora occurring along a given magnetic meridian of the sky. Data from each spectral frame were recorded on an IBM punched card. The data recorded on the cards are printed onto the tabulations in this volume. These tabulations are available

Neurofeedback, aplicaciones y eficacia

OpenAIRE

Fajardo, Alexandra; Guzmán, Ana Lucía

2016-01-01

El objetivo del estudio que se informa fue describir la técnica de neurofeedback, sus aplicaciones y usos, como así también determinar su eficacia a lo largo de los estudios revisados. De esta forma se encuentra la compilación de 53 artículos científicos acerca de la técnica, que describen cómo los autores han demostrado su funcionalidad, cuando se trata de proyectar de manera tangible el rendimiento de algún tipo de población para la posterior formulación de un tratamiento o intervención par...

Spectrographical method for determining temperature variations of cosmic rays

International Nuclear Information System (INIS)

Dorman, L.I.; Krest'yannikov, Yu.Ya.; AN SSSR, Irkutsk. Sibirskij Inst. Zemnogo Magnetizma Ionosfery i Rasprostraneniya Radiovoln)

1977-01-01

A spectrographic method for determining [sigmaJsup(μ)/Jsup(μ)]sub(T) temperature variations in cosmic rays is proposed. The value of (sigmaJsup(μ)/Jsup(μ)]sub(T) is determined from three equations for neutron supermonitors and the equation for the muon component of cosmic rays. It is assumed that all the observation data include corrections for the barometric effect. No temperature effect is observed in the neutron component. To improve the reliability and accuracy of the results obtained the surface area of the existing devices and the number of spectrographic equations should be increased as compared with that of the unknown values. The value of [sigmaJsup(μ)/Jsup(μ)]sub(T) for time instants when the aerological probing was carried out, was determined from the data of observations of cosmic rays with the aid of a spectrographic complex of devices of Sib IZMIR. The r.m.s. dispersion of the difference is about 0.2%, which agrees with the expected dispersion. The agreement obtained can be regarded as an independent proof of the correctness of the theory of meteorological effects of cosmic rays. With the existing detection accuracy the spectrographic method can be used for determining the hourly values of temperature corrections for the muon component

Spectrographic Determination of Trace Constituents in Rare Earths

International Nuclear Information System (INIS)

Capdevila, C.; Alvarez, F.

1962-01-01

A spectrographic method was developed for the determination of 18 trace elements in lanthanum, cerium, praseodimium, neodimium and samarium compounds. The concentrations of the impurities cover the range of 0,5 to 500 ppm. Most of these impurities are determined by the carrier distillation method. Several more refractory elements have been determined by total burning of the sample with a direct current arc or by the conduction briquet excitation technique with a high voltage condensed spark. The work has been carried out with a Hilger Automatic Large Quartz Spectrograph. (Author) 5 refs

Spectrographic analysis of waste waters; Analisis espectrografico de aguas residuales

Energy Technology Data Exchange (ETDEWEB)

Alvarez Alduan, F; Capdevila, C

1979-07-01

The Influence of sodium and calcium, up to a maximum concentration of 1000 mg/1 Na and 300 mg/1 Ca, in the spectrographic determination of Cr, Cu, Fe,Mn and Pb in waste waters using graphite spark excitation has been studied. In order to eliminate this influence, each of the elements Ba, Cs, In, La, Li, Sr and Ti, as well as a mixture containing 5% Li-50% Ti, have been tested as spectrochemical buffers. This mixture allows to obtain an accuracy better than 25%. Sodium and calcium enhance the line intensities of impurities, when using graphite or gold electrodes, but they produce an opposite effect if copper or silver electrodes are used. (Author) 1 refs.

Rapid spectrographic method for determining microcomponents in solutions

International Nuclear Information System (INIS)

Karpenko, L.I.; Fadeeva, L.A.; Gordeeva, A.N.; Ermakova, N.V.

1984-01-01

Rapid spectrographic method foe determining microcomponents (Cd, V, Mo, Ni, rare earths and other elements) in industrial and natural solutions has been developed. The analyses were conducted in argon medium and in the air. Calibration charts for determining individual rare earths in solutions are presented. The accuracy of analysis (Sr) was detection limit was 10 -3 -10 -4 mg/ml, that for rare earths - 1.10 -2 mg/ml. The developed method enables to rapidly analyze solutions (sewages and industrialllwaters, wine products) for 20 elements including 6 rare earths, using strandard equipment

The problem of scattering in fibre-fed VPH spectrographs and possible solutions

Science.gov (United States)

Ellis, S. C.; Saunders, Will; Betters, Chris; Croom, Scott

2014-07-01

All spectrographs unavoidably scatter light. Scattering in the spectral direction is problematic for sky subtraction, since atmospheric spectral lines are blurred. Scattering in the spatial direction is problematic for fibre fed spectrographs, since it limits how closely fibres can be packed together. We investigate the nature of this scattering and show that the scattering wings have both a Lorentzian component, and a shallower (1/r) component. We investigate the causes of this from a theoretical perspective, and argue that for the spectral PSF the Lorentzian wings are in part due to the profile of the illumination of the pupil of the spectrograph onto the diffraction grating, whereas the shallower component is from bulk scattering. We then investigate ways to mitigate the diffractive scattering by apodising the pupil. In the ideal case of a Gaussian apodised pupil, the scattering can be significantly improved. Finally we look at realistic models of the spectrograph pupils of fibre fed spectrographs with a centrally obstructed telescope, and show that it is possible to apodise the pupil through non-telecentric injection into the fibre.

SPRAT: Spectrograph for the Rapid Acquisition of Transients

Science.gov (United States)

Piascik, A. S.; Steele, Iain A.; Bates, Stuart D.; Mottram, Christopher J.; Smith, R. J.; Barnsley, R. M.; Bolton, B.

2014-07-01

We describe the development of a low cost, low resolution (R ~ 350), high throughput, long slit spectrograph covering visible (4000-8000) wavelengths. The spectrograph has been developed for fully robotic operation with the Liverpool Telescope (La Palma). The primary aim is to provide rapid spectral classification of faint (V ˜ 20) transient objects detected by projects such as Gaia, iPTF (intermediate Palomar Transient Factory), LOFAR, and a variety of high energy satellites. The design employs a volume phase holographic (VPH) transmission grating as the dispersive element combined with a prism pair (grism) in a linear optical path. One of two peak spectral sensitivities are selectable by rotating the grism. The VPH and prism combination and entrance slit are deployable, and when removed from the beam allow the collimator/camera pair to re-image the target field onto the detector. This mode of operation provides automatic acquisition of the target onto the slit prior to spectrographic observation through World Coordinate System fitting. The selection and characterisation of optical components to maximise photon throughput is described together with performance predictions.

Sistema para la monitorización y estudio de aplicaciones maliciosas para Android

OpenAIRE

Gutiérrez Hernández, Sergio

2014-01-01

Los teléfonos móviles inteligentes (smartphones) se han posicionado como aparatos altamente populares con grandes capacidades de cómputo, comunicación y sensorización. Estos dispositivos se caracterizan por su habilidad para incorporar aplicaciones desarrolladas por terceras partes, capaces de acceder a los servicios proporcionados por el smartphone. En este contexto, hemos podido observar durante los últimos años un crecimiento exponencial en el número de muestras de aplicaciones haciendo un...

Workshop for cascade project, physics using large acceptance spectrograph and its technical considerations

International Nuclear Information System (INIS)

1989-03-01

The Workshop for Cascade, subtitled 'Physics Using Large Acceptance Spectrograph and Its Technical Considerations', was held on July 13, 1988 by the Nuclear Physics Research Center, Osaka University. The present proceedings carry a total of 18 reports, which are entitled 'RCNP Large Acceptance Spectrograph (plan)', 'Correlation Experiments with a System Consisting of a Small Number of Nucleons', 'Measurement of (d,d) and (d, 2 He) Reactions with Large Solid Angle Spectrograph', 'The (p,2p) and (p,pn) Reactions', 'Correlation Experiments with Large Acceptance Spectrograph', 'Efforts at Determination of Various Correlations in Alpha Particles', 'Two-Nucleon Correlation in Nucleus', 'A Study on Particle Migration Reaction with Broad-Band Spectrograph', 'Measurement of Response in Highly Excited State during Nucleon Migration Reaction', 'A Study on Δ-Excitation within Nucleus', 'A Few Problems Related with Response in Highly Excited State', 'Spin-Isospin Modes in Continuum', '(p,π) and (p,xπ) Reactions', 'Formation of π - in (p,2p) Reaction', 'Formation of π-Mesonic Atom with Consistent Momentum', 'Measurement of Excitation Functions by Means of 'Inconsistent' Dispersion in Magnetic Spectrograph', 'Deeply Bound π - States by 'π - Transfer' (n,p) Reactions', and 'On High Resolution (n,p) Facilities'. (N.K.)

X-ray spectrometer spectrograph telescope system. [for solar corona study

Science.gov (United States)

Bruner, E. C., Jr.; Acton, L. W.; Brown, W. A.; Salat, S. W.; Franks, A.; Schmidtke, G.; Schweizer, W.; Speer, R. J.

1979-01-01

A new sounding rocket payload that has been developed for X-ray spectroscopic studies of the solar corona is described. The instrument incorporates a grazing incidence Rowland mounted grating spectrograph and an extreme off-axis paraboloic sector feed system to isolate regions of the sun of order 1 x 10 arc seconds in size. The focal surface of the spectrograph is shared by photographic and photoelectric detection systems, with the latter serving as a part of the rocket pointing system control loop. Fabrication and alignment of the optical system is based on high precision machining and mechanical metrology techniques. The spectrograph has a resolution of 16 milliangstroms and modifications planned for future flights will improve the resolution to 5 milliangstroms, permitting line widths to be measured.

Análisis de la calidad y seguridad de la información de aplicaciones móviles en prevención terciaria

Directory of Open Access Journals (Sweden)

Martínez-Moreno J

2015-12-01

Full Text Available Objetivo: Analizar la calidad y seguridad de la información de las aplicaciones móviles en la App Store de Apple® destinadas a prevención terciaria. Material y métodos: Estudio observacional transversal de las aplicaciones móviles más populares en la categoría de medicina disponibles en Apple Store® a día de 21 de diciembre de 2014. Las aplicaciones fueron evaluadas con los criterios establecidos en el programa AppSaludable. Se seleccionaron aquellos criterios relacionados con la evaluación de la calidad y seguridad de la información. Resultados: De las 160 aplicaciones recogidas, sólo 12 aplicaciones estaban incluidas en la prevención terciaria. Todas las aplicaciones recuperadas estaban relacionadas con la adherencia, diabetes, hipertensión y alergia. Las aplicaciones desarrolladas por equipos multidisciplinares fueron las que presentaron mayor rigor en su información, Conclusiones: La presencia de un profesional sanitario como colaborador de la aplicación parece mejorar la calidad de la información.

Ingeniería de software en el desarrollo de aplicaciones para dispositivos móviles

OpenAIRE

Thomas, Pablo Javier; Galdámez, Nicolás; Delía, Lisandro Nahuel; Cristina, Federico; Dapoto, Sebastián H.; Tinetti, Fernando Gustavo; Pesado, Patricia Mabel; De Giusti, Armando Eduardo

2013-01-01

Se presenta una línea de investigación y desarrollo que tiene por objeto estudiar temas relacionados con aplicaciones para dispositivos móviles, fundamentalmente aspectos de Ingeniería de Software orientados al desarrollo e implementación de aplicaciones móviles, sobre diversos entornos operativos y el estudio y desarrollo de aspectos de conectividad entre dispositivos móviles.

Design and realization of the real-time spectrograph controller for LAMOST based on FPGA

Science.gov (United States)

Wang, Jianing; Wu, Liyan; Zeng, Yizhong; Dai, Songxin; Hu, Zhongwen; Zhu, Yongtian; Wang, Lei; Wu, Zhen; Chen, Yi

2008-08-01

A large Schmitt reflector telescope, Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST), is being built in China, which has effective aperture of 4 meters and can observe the spectra of as many as 4000 objects simultaneously. To fit such a large amount of observational objects, the dispersion part is composed of a set of 16 multipurpose fiber-fed double-beam Schmidt spectrographs, of which each has about ten of moveable components realtimely accommodated and manipulated by a controller. An industrial Ethernet network connects those 16 spectrograph controllers. The light from stars is fed to the entrance slits of the spectrographs with optical fibers. In this paper, we mainly introduce the design and realization of our real-time controller for the spectrograph, our design using the technique of System On Programmable Chip (SOPC) based on Field Programmable Gate Array (FPGA) and then realizing the control of the spectrographs through NIOSII Soft Core Embedded Processor. We seal the stepper motor controller as intellectual property (IP) cores and reuse it, greatly simplifying the design process and then shortening the development time. Under the embedded operating system μC/OS-II, a multi-tasks control program has been well written to realize the real-time control of the moveable parts of the spectrographs. At present, a number of such controllers have been applied in the spectrograph of LAMOST.

Aplicaciones científicas numéricas: El (ciclo de vida del) Software heredado

OpenAIRE

Méndez, Mariano; Tinetti, Fernando Gustavo

2012-01-01

El objetivo de esta línea de investigación es el estudio de las aplicaciones científicas de cómputo numérico desde el punto de vista de la Ingeniería de Software y del Procesamiento Paralelo. Además, se orienta a desarrollar técnicas y herramientas destinadas a reestructurar dichas aplicaciones permitiendo que éstas evolucionen a través del tiempo mejorando sus prestaciones y su estructura.

Optical design and performance of a dual-grating, direct-reading spectrograph for spectrochemical analyses

International Nuclear Information System (INIS)

Steinhaus, D.W.; Kline, J.V.; Bieniewski, T.M.; Dow, G.S.; Apel, C.T.

1979-01-01

An all-mirror optical system is used to direct the light from a variety of spectroscopic sources to two 2-m spectrographs that are placed on either side of a sturdy vertical mounting plate. The gratings were chosen so that the first spectrograph covers the ultraviolet spectral region, and the second spectrograph covers the ultraviolet, visible, and near-infrared regions. With the over 2.5 m of focal curves, each ultraviolet line is available at more than one place. Thus, problems with close lines can be overcome. The signals from a possible maximum of 256 photoelectric detectors go to a small computer for reading and calculation of the element abundances. To our knowledge, no other direct-reading spectrograph has more than about 100 fixed detectors. With an inductively-coupled-plasma source, our calibration curves, and detection limits, are similar to those of other workers using a direct-reading spectrograph

Optical Design And Performance Of A Dual-Grating, Direct-Reading Spectrograph For Spectrochemical Analyses

Science.gov (United States)

Steinhaus, David W.; Kline, John V.; Bieniewski, Thomas M.; Dow, Grove S.; Apel, Charles T.

1980-11-01

An all-mirror optical system is used to direct the light from a variety of spectroscopic sources to two 2-m spectrographs that are placed on either side of a sturdy vertical mounting plate. The gratings were chosen so that the first spectrograph covers the ultraviolet spectral region, and the second spectrograph covers the ultraviolet, visible, and near-infrared regions. With the over 2.5 m of focal curves, each ultraviolet line is available at more than one place. Thus, problems with close lines can be overcome. The signals from a possible maximum of 256 photoelectric detectors go to a small computer for reading and calculation of the element abundances. To our knowledge, no other direct-reading spectrograph has more than about 100 fixed detectors. With an inductively-coupled-plasma source, our calibration curves, and detection limits, are similar to those of other workers using a direct-reading spectrograph.

Diseño de una arquitectura para redes de sensores con soporte para aplicaciones de detección de eventos

OpenAIRE

LINO RAMIREZ, CARLOS

2012-01-01

Las aplicaciones para redes de sensores inalámbricas, o Wireless Sensor Networks (WSNs), han mostrado un crecimiento significativo en los últimos años. Actualmente constituyen una alternativa tecnológica interesante para el desarrollo de aplicaciones que requieren monitorizar constantemente el estado de cualquier variable relacionada con escenarios de diversos ámbitos. Si las aplicaciones detectan cambios en los valores de dichas variables, pueden activar la ejecución de acciones preventivas ...

Optical design of a versatile FIRST high-resolution near-IR spectrograph

Science.gov (United States)

Zhao, Bo; Ge, Jian

2012-09-01

We report the update optical design of a versatile FIRST high resolution near IR spectrograph, which is called Florida IR Silicon immersion grating spectromeTer (FIRST). This spectrograph uses cross-dispersed echelle design with white pupils and also takes advantage of the image slicing to increase the spectra resolution, while maintaining the instrument throughput. It is an extremely high dispersion R1.4 (blazed angle of 54.74°) silicon immersion grating with a 49 mm diameter pupil is used as the main disperser at 1.4μm -1.8μm to produce R=72,000 while an R4 echelle with the same pupil diameter produces R=60,000 at 0.8μm -1.35μm. Two cryogenic Volume Phase Holographic (VPH) gratings are used as cross-dispersers to allow simultaneous wavelength coverage of 0.8μm -1.8μm. The butterfly mirrors and dichroic beamsplitters make a compact folding system to record these two wavelength bands with a 2kx2k H2RG array in a single exposure. By inserting a mirror before the grating disperser (the SIG and the echelle), this spectrograph becomes a very efficient integral field 3-D imaging spectrograph with R=2,000-4,000 at 0.8μm-1.8μm by coupling a 10x10 telescope fiber bundle with the spectrograph. Details about the optical design and performance are reported.

Spectra of Th/Ar and U/Ne hollow cathode lamps for spectrograph calibration

Science.gov (United States)

Nave, Gillian; Shlosberg, Ariel; Kerber, Florian; Den Hartog, Elizabeth; Neureiter, Bianca

2018-01-01

Low-current Th/Ar hollow cathode lamps have long been used for calibration of astronomical spectrographs on ground-based telescopes. Thorium is an attractive element for calibration as it has a single isotope, has narrow spectral lines, and has a dense spectrum covering the whole of the visible region. However, the high density of the spectrum that makes it attractive for calibrating high-resolution spectrographs is a detriment for lower resolution spectrographs and this is not obvious by examination of existing linelists. In addition, recent changes in regulations regarding the handling of thorium have led to a degradation in the quality of Th/Ar calibration lamps, with contamination by molecular ThO lines that are strong enough to obscure the calibration lines of interest.We are pursuing two approaches to these problems. First, we have expanded and improved the NIST Standard Reference Database 161, "Spectrum of Th-Ar Hollow Cathode Lamps" to cover the region 272 nm to 5500 nm. Spectra of hollow cathode lamps at up to 3 different currents can now be displayed simultaneously. Interactive zooming and the ability to convolve any of the spectra with a Gaussian or uploaded instrument profile enable the user to see immediately what the spectrum would look like at the particular resolution of their spectrograph. Second, we have measured the spectrum of a recent, contaminated Th/Ar hollow cathode lamp using a high-resolution Echelle spectrograph (Madison Wisconsin) at a resolving power (R~ 250,000). This significantly exceeds the resolving power of most astronomical spectrographs and resolves many of the molecular lines of ThO. With these spectra we are measuring and calibrating the positions of these molecular lines in order to make them suitable for spectrograph calibration.In the near infrared region, U/Ne hollow cathode lamps give a higher density of calibration lines than Th/Ar lamps and will be implemented on the upgraded CRIRES+ spectrograph on ESO’s Very Large

The Use of Color Sensors for Spectrographic Calibration

Science.gov (United States)

Thomas, Neil B.

2018-04-01

The wavelength calibration of spectrographs is an essential but challenging task in many disciplines. Calibration is traditionally accomplished by imaging the spectrum of a light source containing features that are known to appear at certain wavelengths and mapping them to their location on the sensor. This is typically required in conjunction with each scientific observation to account for mechanical and optical variations of the instrument over time, which may span years for certain projects. The method presented here investigates the usage of color itself instead of spectral features to calibrate a spectrograph. The primary advantage of such a calibration is that any broad-spectrum light source such as the sky or an incandescent bulb is suitable. This method allows for calibration using the full optical pathway of the instrument instead of incorporating separate calibration equipment that may introduce errors. This paper focuses on the potential for color calibration in the field of radial velocity astronomy, in which instruments must be finely calibrated for long periods of time to detect tiny Doppler wavelength shifts. This method is not restricted to radial velocity, however, and may find application in any field requiring calibrated spectrometers such as sea water analysis, cellular biology, chemistry, atmospheric studies, and so on. This paper demonstrates that color sensors have the potential to provide calibration with greatly reduced complexity.

A color spectrographic phonocardiography (CSP applied to the detection and characterization of heart murmurs: preliminary results

Directory of Open Access Journals (Sweden)

Hassani Kamran

2011-05-01

Full Text Available Abstract Background Although cardiac auscultation remains important to detect abnormal sounds and murmurs indicative of cardiac pathology, the application of electronic methods remains seldom used in everyday clinical practice. In this report we provide preliminary data showing how the phonocardiogram can be analyzed using color spectrographic techniques and discuss how such information may be of future value for noninvasive cardiac monitoring. Methods We digitally recorded the phonocardiogram using a high-speed USB interface and the program Gold Wave http://www.goldwave.com in 55 infants and adults with cardiac structural disease as well as from normal individuals and individuals with innocent murmurs. Color spectrographic analysis of the signal was performed using Spectrogram (Version 16 as a well as custom MATLAB code. Results Our preliminary data is presented as a series of seven cases. Conclusions We expect the application of spectrographic techniques to phonocardiography to grow substantially as ongoing research demonstrates its utility in various clinical settings. Our evaluation of a simple, low-cost phonocardiographic recording and analysis system to assist in determining the characteristic features of heart murmurs shows promise in helping distinguish innocent systolic murmurs from pathological murmurs in children and is expected to useful in other clinical settings as well.

Sistemas ubiquos: desarrollo y aplicaciones

OpenAIRE

Ramón, Hugo Dionisio; Charne, Javier; Di Cicco, Carlos; Riva, Diego Germán de la; Smail, Ana; Osella Massa, Germán Leandro

2013-01-01

Se presenta un proyecto de investigación aplicada al cómputo ubiquo (ubicomp), abarcando aspectos que van desde los fundamentos del desarrollo (técnicas de Ingeniería de requerimientos, metodologías de gestión, desarrollo de proyectos, técnicas de planificación, métricas, normas de calidad, redes de sensores y algoritmos inteligentes y procesamiento de señales) hasta la concepción de aplicaciones específicas orientadas a los procesos productivos de la región y el país, procesos de egobierno y...

Spectrographic determination of impurities in beryllium oxide

International Nuclear Information System (INIS)

Paula Reino, L.C. de; Lordello, A.R.; Pereira, A.S.A.

1986-03-01

A method for the spectrographic determination of Al, B, Cd, Co, Cu, Cr, Fe, Mg, NaNi, Si and Zn in nuclear grade beryllium oxide has been developed. The determination of Co, Al, Na and Zn is besed upon a carrier distillation technique. Better results were obtained with 2% Ga 2 O 3 as carrier in beryllium oxide. For the elements B, Cd, Cu, Fe, Cr, Mg, Ni and Si the sample is loaded in a Scribner-Mullin shallow cup electrode, covered with graphite powder and excited in DC arc. The relative standard deviation values for different elements are in the range of 10 to 20%. The method fulfills requirements of precision and sensitivity for specification analysis of nuclear grade beryllium oxide.(Author) [pt

Aplicaciones de caucho reciclado: Una revisión de la literatura

Directory of Open Access Journals (Sweden)

Gabriel Jaime Peláez Arroyave

2017-01-01

Full Text Available La generación de residuos de caucho se ha convertido en una preocupación global por su impacto negativo en el medio ambiente y en la salud humana. La legislación ambiental sobre la disposición de este tipo de residuos ha venido aumentando las exigencias a los fabricantes, comercializadores y usuarios, con lo cual se ha acelerado la búsqueda de alternativas para el reaprovechamiento de los residuos de caucho. Este artículo presenta una revisión bibliográfica acerca de las principales tendencias en la utilización del caucho reciclado, incluyendo aplicaciones actualmente comercializadas y otras derivadas tanto de estudios terminados como de líneas de investigación en desarrollo. Las aplicaciones con mayor potencial de volumen consumido son del sector infraestructura y construcciones civiles, especialmente asfaltos, concretos y materiales aislantes para construcción liviana. Algunas aplicaciones con potencial en el futuro cercano son los filtros para la limpieza de aguas contaminadas y como componente en materiales compuestos con matriz termoplástica o en poliuretano. Se evidencia la pertinencia de continuar investigando sobre esta temática, que posee unos retos científicos de alta relevancia, los cuales ameritan la mayor atención por el problema ambiental significativo asociado al manejo de los residuos de caucho.

The influence of calcium magnesium, and sodium on the spectrographic analysis of natural waters

International Nuclear Information System (INIS)

Diaz Guerra, J. P.; Capdevilla, C.

1969-01-01

The influences of 1000 μg/ml of calcium and sodium and 300 μg/ml of magnesium, on the spectrographic determination of Al, Ba, Cr, Fe, Li , Mn, Ni, Pb, Sr and Ti, minor constituents in natural waters, have been studied, In order to eliminate them, the elements Ga, In, La, Ti and Zn, as well as a mixture containing 30 % Tl-70 % In, have been tested as spectrochemical buffers. (Author) 7 refs

Evaluación de los Frameworks en el Desarrollo de Aplicaciones Web con Python

Directory of Open Access Journals (Sweden)

Jimmy Rolando Molina Ríos

2016-09-01

Full Text Available Debido a la creciente interacción de los usuarios con sistemas web, surge la necesidad de combinar las funcionalidades de aplicaciones clásicas de escritorio, con la accesibilidad y bajo costo de la publicación de aplicaciones web; dando origen a la elección del mejor marco de trabajo que se adopte a las necesidades de los desarrolladores. Esta investigación presenta un análisis comparativo de los frameworks que trabajan con el lenguaje Python para el desarrollo de aplicaciones web. Para ello el análisis se formuló mediante un modelo de evaluación que se basa en las características de calidad propuestas en la norma ISO/IEC 9126. Estas a su vez permiten establecer sub-características, atributos y métricas para evaluar la calidad de las aplicaciones web. Permitiendo obtener como resultado una matriz para la Evaluación de Frameworks: Django, Pyramid, Turbogear y Web2PY. Los resultados obtenidos mostraron las fortalezas y debilidades de cada framework y fue la base para determinar que Django es el mejor framework para la implementación de desarrollo de sistemas web. Este framework cumplió con todos los indicadores del modelo de evaluación, los resultados redactados al final del documento determinan que tomando en cuenta las métricas de calidad se puede elegir qué marco de trabajo es el que mejor se adapta para el desarrollo de aplicaciones web en la Ciudad de Machala. Antes de realizar una evaluación se considera indispensable conocer y comprender el funcionamiento de los elementos que se vaya a cotejar, para ello es recomendable emplear tablas para la comparación de las características, teniendo como referencia sitios web confiables que aporten documentación sobre los frameworks y el empleo de estándares de calidad para su determinación.

PATRONES DE MULTICULTURALIDAD PARA EL DISEÑO DE APLICACIONES WEB

Directory of Open Access Journals (Sweden)

Víctor Alfonso Zapata

2014-01-01

Full Text Available La diversidad cultural en la Web surge como resultado del crecimiento de internet en los últimos años, logrando que los servicios y aplicaciones Web sean cada vez más utilizados por usuarios de diversas culturas, que en muchos casos terminan siendo diferentes a los usuarios iniciales en los que se basó su diseño y construcción. Este trabajo analiza las diferencias que se presentan en la comunicación multicultural a través de la Web, tomando como punto de partida las dimensiones culturales propuestas por Victor, Hofstede, Trompenaars y Hall. Se identificaron los elementos de diseño Web que están relacionados con las dimensiones culturales y su comportamiento en sitios Web representativos de Argentina, Colombia y España para finalmente construir un conjunto de Patrones de Multiculturalidad para el Diseño de Aplicaciones Web.

Seguridad y privacidad en aplicaciones Android

OpenAIRE

Piñeiro Ramos, Ismael

2017-01-01

Este trabajo explora las vulnerabilidades existentes en los dispositivos móviles tomando como plataforma el sistema operativo Android. Se pretende estudiar en profundidad las posibilidades de inoculación de código de mal comportamiento y el control del hardware de forma remota. La necesidad de estar permanentemente conectado a través del correo electrónico, las herramientas y aplicaciones para redes sociales, la integración de la grabadora de sonido, vídeo y cámara fotográfica en el propio di...

Lenguaje específico de dominio para aplicaciones de modelación glaciológica

OpenAIRE

Gel, Matías; Urciuolo, Adriana Beatriz; Iturraspe, Rodolfo Javier

2014-01-01

Las aplicaciones de software de modelado de la naturaleza se caracterizan por la complejidad propia de la información y procesos ambientales. Se requiere un nivel de abstracción adecuado y flexibilidad para la modelación de los procesos naturales. Algunas limitaciones del software del dominio provienen del uso de herramientas y lenguajes que carecen de facilidades para representar los conceptos particulares de estas aplicaciones. El Modelado específico del dominio (DSM) propone elevar el nive...

The Oxford SWIFT Spectrograph: first commissioning and on-sky results

OpenAIRE

Thatte, Niranjan; Tecza, Mathias; Clarke, Fraser; Goodsall, Timothy; Fogarty, Lisa; Houghton, Ryan; Salter, Graeme; Scott, Nicholas; Davies, Roger L.; Bouchez, Antonin; Dekany, Richard

2010-01-01

The Oxford SWIFT spectrograph, an I & z band (6500-10500 A) integral field spectrograph, is designed to operate as a facility instrument at the 200 inch Hale Telescope on Palomar Mountain, in conjunction with the Palomar laser guide star adaptive optics system PALAO (and its upgrade to PALM3000). SWIFT provides spectra at R(≡λ/▵λ)~4000 of a contiguous two-dimensional field, 44 x 89 spatial pixels (spaxels) in size, at spatial scales of 0.235";, 0.16", and 0.08" per spaxel. It employs two 250μ...

Using a new, free spectrograph program to critically investigate acoustics

Science.gov (United States)

Ball, Edward; Ruiz, Michael J.

2016-11-01

We have developed an online spectrograph program with a bank of over 30 audio clips to visualise a variety of sounds. Our audio library includes everyday sounds such as speech, singing, musical instruments, birds, a baby, cat, dog, sirens, a jet, thunder, and screaming. We provide a link to a video of the sound sources superimposed with their respective spectrograms in real time. Readers can use our spectrograph program to view our library, open their own desktop audio files, and use the program in real time with a computer microphone.

Investigación en Progreso: Ingeniería de Software en el Desarrollo de Aplicaciones Sensibles al Contexto

Directory of Open Access Journals (Sweden)

Marisa D. Panizzi

2015-10-01

Full Text Available Las aplicaciones han ido evolucionando independientemente de cuál sea su dominio de aplicación, actualmente nos encontramos con aplicaciones que pueden brindar servicios de acuerdo a la ubicación, tiempo y perfil del usuario. Este tipo de aplicaciones que brindan estos servicios se las conoce como Aplicaciones Sensibles al Contexto (CA – Context Aware, en este tipo de aplicaciones predominan los dispositivos móviles y el perfil del usuario. La evolución varía en función de la forma de uso de la computadora, es decir que se brinden servicios a pedido del usuario o que se brinden servicios de manera automática. Para acompañar la evolución de este tipo de aplicaciones, la Ingeniería de Software ha focalizado sus esfuerzos en aspectos relacionados a separar la aplicación de todo lo concerniente a la captación, interpretación, control y supervisión de la información contextual. Es decir que desde el punto de vista del diseño, se separe la conducta sensible al contexto de la conducta propia de la aplicación con el propósito de que ambos tipos de aplicaciones pueden evolucionar en forma independiente además de reducir el tiempo de desarrollo en este tipo de sistemas. Este proyecto presenta una sub línea, la cual orientará sus aportes, en la consolidación de un framework de gestión contextual de dos o tres variables de contexto como por ejemplo: la ubicación, considerando la construcción de la documentación relevante que lo respalde como así también su fase de experimentación con una aplicación que permitirá a los usuarios de la comunidad universitaria UM hacer uso de los servicios ofrecidos por la misma. La segunda sub línea, se vincula al Área de la Ingeniería de Requisitos, pretendiendo obtener un modelo para la especificación de requisitos de software para sistemas sensibles al contexto.

Spectrographic determination of impurities in uranium tetrafluoride matrices

International Nuclear Information System (INIS)

Reino, Luiz Carlos de Paula

1980-01-01

A direct spectrographic method for the determination of UF 4 impurities was developed. Investigations using spectrochemical carriers were carried out so to avoid uranium distillation, which as fluoride is much more volatile than the U 3 O 8 refractory matrix. The best results were obtained by using a mixture of MgO and NaCl carriers in the proportion of 20% and 10%, respectively, with respect to UF 4 matrix. An original spectrographic technique was introduced aiming to avoid the projection of sample particles outside the electrode during excitation. This new technique is based on the addition of a small quantity of a 0.5% gelatinous solution on the UF 4 tablet. The precision of the method was studied for each element analysed. The variation coefficients are within the range of 10 of 20%

Application of frequency converters in industry; Aplicacion de convertidores de frecuencia en la industria

Energy Technology Data Exchange (ETDEWEB)

Adame Gonzalez, A.; Aguilar Galvan, A. [Ingenieria Energetica Integral, S.A. de C.V. (Mexico)

1997-12-31

Some of the applications of the frequency converters will be analyzed, as well as the parameters to be considered for the feasibility of its application evaluation. It is also described how an energy evaluation is accomplished and finally a series of actions are enlisted conducting to the energy savings. [Espanol] Se presentaran algunas de las aplicaciones de los convertidores de frecuencia. Ademas se indicaran los parametros a registrar para evaluar la factibilidad de aplicacion de los mismos, se describe como ejecutar la evaluacion energetica y finalmente se listan una serie de acciones que conducen a lograr ahorros de energia.

Application of frequency converters in industry; Aplicacion de convertidores de frecuencia en la industria

Energy Technology Data Exchange (ETDEWEB)

Adame Gonzalez, A; Aguilar Galvan, A [Ingenieria Energetica Integral, S.A. de C.V. (Mexico)

1998-12-31

Some of the applications of the frequency converters will be analyzed, as well as the parameters to be considered for the feasibility of its application evaluation. It is also described how an energy evaluation is accomplished and finally a series of actions are enlisted conducting to the energy savings. [Espanol] Se presentaran algunas de las aplicaciones de los convertidores de frecuencia. Ademas se indicaran los parametros a registrar para evaluar la factibilidad de aplicacion de los mismos, se describe como ejecutar la evaluacion energetica y finalmente se listan una serie de acciones que conducen a lograr ahorros de energia.

Technical aspects of the Space Telescope Imaging Spectrograph Repair (STIS-R)

Science.gov (United States)

Rinehart, S. A.; Domber, J.; Faulkner, T.; Gull, T.; Kimble, R.; Klappenberger, M.; Leckrone, D.; Niedner, M.; Proffitt, C.; Smith, H.; Woodgate, B.

2008-07-01

In August 2004, the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) ceased operation due to a failure of the 5V mechanism power converter in the Side 2 Low Voltage Power Supply (LVPS2). The failure precluded movement of any STIS mechanism and, because of the earlier (2001) loss of the Side 1 electronics chain, left the instrument shuttered and in safe mode after 7.5 years of science operations. A team was assembled to analyze the fault and to determine if STIS repair (STIS-R) was feasible. The team conclusively pinpointed the Side 2 failure to the 5V mechanism converter, and began studying EVA techniques for opening STIS during Servicing Mission 4 (SM4) to replace the failed LVPS2 board. The restoration of STIS functionality via surgical repair by astronauts has by now reached a mature and final design state, and will, along with a similar repair procedure for the Advanced Camera for Surveys (ACS), represent a first for Hubble servicing. STIS-R will restore full scientific functionality of the spectrograph on Side 2, while Side 1 will remain inoperative. Because of the high degree of complementarity between STIS and the new Cosmic Origins Spectrograph (COS, to be installed during SM4)), successful repair of the older spectrograph is an important scientific objective. In this presentation, we focus on the technical aspects associated with STIS-R.

Vacuum Predisperser For A Large Plane-Grating Spectrograph

Science.gov (United States)

Engleman, R.; Palmer, B. A.; Steinhaus, D. W.

1980-11-01

A plane grating predisperser has been constructed which acts as an "order-sorter" for a large plane-grating spectrograph. This combination can photograph relatively wide regions of spectra in a single exposure with no loss of resolution.

Análisis del comportamiento contextual del usuario y su relación con el consumo de aplicaciones móviles

OpenAIRE

Luis Antonio Rojas-Potosí; Leandro Krug Wives; Alejandro Fernández; Juan Carlos Corrales

2014-01-01

El mercado de aplicaciones móviles crece aceleradamente, captando la atención sobre el análisis del consumo de las mismas para mejorar su recomendación y la satisfacción del usuario, soportado en la búsqueda de información que permita explicar la ocurrencia de eventos del ciclo de vida de las aplicaciones. En este sentido algunos estudios muestran una fuerte relación entre dichos eventos e información sobre la situación contextual actual del usuario y su registro de consumo de aplicaciones. S...

bHROS: A New High-Resolution Spectrograph Available on Gemini South

Science.gov (United States)

Margheim, S. J.; Gemini bHROS Team

2005-12-01

The Gemini bench-mounted High-Resolution Spectrograph (bHROS) is available for science programs beginning in 2006A. bHROS is the highest resolution (R=150,000) optical echelle spectrograph optimized for use on an 8-meter telescope. bHROS is fiber-fed via GMOS-S from the Gemini South focal plane and is available in both a dual-fiber Object/Sky mode and a single (larger) Object-only mode. Instrument characteristics and sample data taken during commissioning will be presented.

Autoría de aplicaciones móviles para el análisis de datos

OpenAIRE

Person Montero, Tatiana

2018-01-01

La incorporación de aplicaciones móviles en diversos entornos genera una gran cantidad de información resultante de la interacción de los usuarios con estas aplicaciones. El análisis de esta información puede ser de gran utilidad para el profesional, ya que le puede facilitar la toma de decisiones o la valoración del proceso que esté aplicando, permitiendo mejorar los resultados o detectar determinados patrones. La información recogida se puede definir siguiendo una serie de características: ...

Spectrographic study of neodymium complexing with ATP and ADP

International Nuclear Information System (INIS)

Svetlova, I.E.; Dobrynina, N.A.; Martynenko, L.N.

1989-01-01

By spectrographic method neodymium complexing with ATP and ADP in aqueous solutions at different pH values has been studied. The composition of the complexes was determined by the method of isomolar series. On the basis of analysis of absorption spectra it has been ascertained that at equimolar ratio of Nd 3+ and ATP absorption band of L278A corresponds to monocomplex, and the band of 4290 A - to biscomplex. For the complexes with ADP the absorption band of 4288 A is referred to bicomplexes. The character of ATP and ADP coordination by Nd 3+ ion is considered. Stability constants of the complexes are calculated

Improvement of spectrographic analyses by the use of a mechanical packer in the arc distillation technique

International Nuclear Information System (INIS)

Buffereau, M.; Deniaud, S.; Pichotin, B.; Violet, R.

1965-01-01

One studies improvement of spectrographic analysis by the 'carrier distillation' method with the help of a mechanical device. Experiments and advantages of such an apparatus are given (precision and reproducibility improvement, operator factor suppression). A routine apparatus (French patent no 976.493) is described. (authors) [fr

Spectrographic determination of impurities in uranium tetrafluoride matrices

International Nuclear Information System (INIS)

Reino, L.C.P.; Lordello, A.R.

1980-01-01

A direct spectrographic method for the determination of UF 4 impurities was developed. Investigations using spectrochemical carriers were carried out so to avoid uranium distillation, which as fluoride is much more volatile than the U 3 O 8 refractory matrix. The best results were obtained by using a mixture of MgO and NaCl carriers in the proportion of 20 and 10%, respectively, with respect to UF 4 matrix. An original spectrographic technique was introduced aiming to avoid the projection of sample particles outside the electrode during excitation. This new technique is based on the addition of a small quantity of a 0.5% gellatinous solution on the UF 4 tablet. The precision of the method was studied for each element analysed. The variation coefficients are within the range of 10 of 20%. (C.L.B.) [pt

Semiquantitative spectrographic analysis of nuclear interest minerals and of various products; Analisis espectrografico semicuantitativo de minerales de interes nuclear y productos diversos

Energy Technology Data Exchange (ETDEWEB)

Alvarez Gonzalez, F; Roca Adell, M; Fernandez Cellini, R

1958-07-01

Because the great number of samples of various kinds receiving in the Chemical Division, minerals in the most part, for its complete analysis, a rapid spectrographic method has been developed. It permits the determination of the following elements with a semiquantitative character. Al, As, Ag, Au, B, Be, Bi, Ca, Cd, Ce, Co, Cr, Cu, Fe, Ga, Ge, Hf, Hn, In, K, La, Li, Mg, Mn, Mo, Na, Nb, P, Pb, Pt, Sb, Si, Sn, Sr, Ta, Ti, V, W, Y, Zn and Zr. (Author) 14 refs.

Development of a Web application for a real time information system; Desarrollo de una aplicacion web para un sistema de informacion en tiempo real

Energy Technology Data Exchange (ETDEWEB)

Espinosa R, Alfredo; Silva F, Brisa M; Quintero R, Agustin [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

2007-07-01

In this article its is described a technique for the development of a Web application for a real time information system that allows the remote and concurrent connection of different equipment to the network historical data base of the system, without the need of the installation of any software component in the remote equipment of the user who makes the consultation. It defines and establishes the software architecture that allows the development of the Web application, the analysis stages, the operation of the technology to be used, as well as the design, development and implementation of the application. Finally, the accomplishments obtained with the development of the Web application for a real time information system are described. [Spanish] En este articulo se describe una tecnica para el desarrollo de una aplicacion web para un sistema de informacion en tiempo real, que permita la conexion remota y concurrente de diferentes equipos en la red a la base de datos historica del sistema, sin necesidad de que se instale ningun componente de software en el equipo remoto del usuario que realiza la consulta. Se define y establece la arquitectura de software que permite el desarrollo de la aplicacion web, las etapas de analisis, el funcionamiento de la tecnologia a utilizar, asi como el diseno, desarrollo e implementacion de la aplicacion. Finalmente, se describen los logros obtenidos con el desarrollo de la aplicacion web para un sistema de informacion en tiempo real.

Study of an integral field spectrograph for the SNAP satellite. Prototype, simulation and performances

International Nuclear Information System (INIS)

Aumeunier, Marie-Helene

2007-01-01

The SNAP (Supernovae/Acceleration Probe) project plans to measure very precisely the cosmological parameters and to determine the nature of dark energy by observations of type Ia supernovae and weak lensing. The SNAP instrument consists in a 2-meter telescope with a one square-degree imager and a spectrograph in the visible and infrared range. A dedicated optimized integral field spectrograph based on an imager slicer technology has been developed. To test and validate the performances, two approaches have been developed: a complete simulation of the complete instrument at the pixel level and the manufacturing and test of a spectrograph prototype operating at room temperature and in cryogenic environment. In this thesis we will test the optical and functional performances of the SNAP spectrograph: especially diffraction losses, stray-light and spectro-photometric calibration. We present an original approach for the spectro-photometric calibration adapted for the slicer and the optical performances resulting from the first measurement campaign in the visible range. (author) [fr

Ultraviolet spectrographs for thermospheric and ionospheric remote sensing

International Nuclear Information System (INIS)

Dymond, K.F.; McCoy, R.P.

1993-01-01

The Naval Research Laboratory (NRL) has been developing far- and extreme-ultraviolet spectrographs for remote sensing the Earth's upper atmosphere and ionosphere. The first of these sensors, called the Special Sensor Ultraviolet Limb Imager (SSULI), will be flying on the Air Force's Defense Meteorological Satellite Program (DMSP) block 5D3 satellites as an operational sensor in the 1997-2010 time frame. A second sensor, called the High-resolution ionospheric and Thermospheric Spectrograph (HITS), will fly in late 1995 on the Air Force Space Test Program's Advanced Research and Global Observation Satellite (ARGOS, also known as P91-1) as part of NRL's High Resolution Airglow and Auroral Spectroscopy (HIRAAS) experiment. Both of these instruments are compact and do not draw much power and would be good candidates for small satellite applications. The instruments and their capabilities are discussed. Possible uses of these instruments in small satellite applications are also presented

Application of charge coupled devices as spatially-resolved detectors for X-ray spectrograph

Energy Technology Data Exchange (ETDEWEB)

Attelan-Langlet, S; Etlicher, B [Ecole Polytechnique, Palaiseau (France); Mishenskij, V O; Papazyan, Yu V; Smirnov, V P; Volkov, G S; Zajtsev, V I [Inst. for Thermonuclear and Innovation Investigations, Troitsk (Russian Federation)

1997-12-31

An X-ray crystal spectrograph which contains a CCD linear array as the position-sensitive detector is described. Radiation detection is performed directly onto CCD. The spectrograph has a limit of sensitivity at about 2 J/(A.ster), spectral resolution about 1000 and dynamic range 100-120. The device operates on-line with IBM-PC based control system. Software provides all data acquisition and treatment. Output spectra are presented in absolute units. The device was used during composite Z-pinch experiments at pulse-power installations ``Angara-5-1`` (TRINITI, Troitsk, Russia) and ``GAEL`` (Ecole Polytechnique, Palaiseau, France). Currently the spectrograph is included in the set of diagnostics of the ``Angara-5-1`` facility. Some of the spectra obtained are presented and discussed. (author). 4 figs., 9 refs.

General method of quantitative spectrographic analysis; Estudio de un metodo general de analisis espectrografico cuantitativo

Energy Technology Data Exchange (ETDEWEB)

Capdevila, C; Roca, M

1966-07-01

A spectrographic method was developed to determine 23 elements in a wide range of concentrations; the method can be applied to metallic or refractory samples. Previous melting with lithium tetraborate and germanium oxide is done in order to avoid the influence of matrix composition and crystalline structure. Germanium oxide is also employed as internal standard. The resulting beads ar mixed with graphite powder (1:1) and excited in a 10 amperes direct current arc. (Author) 12 refs.

A soft X-Ray flat field grating spectrograph and its experimental applications

International Nuclear Information System (INIS)

Ni Yuanlong; Mao Chusheng

2001-01-01

The principle, structure, and application results of a flat field grating spectrograph for X-ray laser research is presented. There are two kinds of the spectrograph. One uses a varied space grating with nominal line spacing 1200 l/mm, the spectral detection range is 5 - 50 nm, and another uses a 2400 l/mm varied line space grating, detection range is 1 - 10 nm. The experimental results of the former is introduced only. Both experimental results of this instrument using the soft X-ray film and a streak camera as the detecting elements are given. The spectral resolutions are 0.01 nm and 0.05 nm, respectively. The temporal resolution is 30 ps. Finally, the stigmatic structure of the spectrograph is introduced, which uses cylindrical mirror and spherical mirror as a focusing system. The magnification is 5, spatial resolution is 25 μm. The experimental results are given as well

Sistema de realidad aumentada para aplicaciones Android

OpenAIRE

Fernández Sánchez, Natalia Mercedes

2012-01-01

El objetivo principal de este proyecto es la creación de un sistema de realidad aumentada para el sistema operativo Android con idea de que sea utilizado para la creación de un videojuego, pero que a su vez sea lo suficientemente versátil como para poder utilizarse en otro tipo de aplicaciones. De este objetivo principal podemos obtener los objetivos secundarios: - Conocer las características que ofrecen los teléfonos móviles y como éstas pueden ser aprovechadas para la crea...

La evaluación de las aplicaciones de lectura web: un paso más en el proceso de editorialización de la web

Directory of Open Access Journals (Sweden)

Noelia Patón Rodríguez

2016-11-01

Full Text Available En el desarrollo de la lectura digital confluyen una serie de factores que pasan entre otras cuestiones por la evolución tecnológica de los dispositivos y el desarrollo de numerosas aplicaciones que facilitan la lectura al tiempo que está provocando cambios en los hábitos de lectura tal y como lo demuestran los diferentes informes. Uno de los desarrollos tecnológicos está relacionado con el diseño de aplicaciones específicas para la lectura en la pantalla del ordenador, son las llamadas aplicaciones de lectura web. En este artículo, tras definir qué son las aplicaciones de lectura web se explican los objetivos y el proceso seguido para la selección, definición y sistematización de los parámetros que servirán para la evaluación de las aplicaciones de lectura web.

Receptor GNSS multiantena para aplicaciones aeroespaciales

OpenAIRE

Cogo, Jorge; López La Valle, Ramón G.; Puga, Gerardo L.; Smidt, Javier A.; Díaz, Juan G.; García, Javier Gonzalo; Roncagliolo, Pedro Agustín; Muravchik, Carlos Horacio

2013-01-01

La determinación de la posición y velocidad del vehículo es una de las tareas críticas en las aplicaciones aeroespaciales como es el caso de aviones, satélites o cohetes. En los últimos años esta tarea se ha visto favorecida por el despliegue de los Sistemas de Navegación Global por Satélite (GNSS). Estos sistemas, utilizando como base una constelación de satélites que envían señales a la superficie terrestre, permiten que un usuario que cuente con un receptor adecuado pueda obtener esta info...

Desarrollo de aplicaciones móviles bajo la plataforma de Iphone

Directory of Open Access Journals (Sweden)

Jaime Esteban Roa Castañeda

2011-07-01

Full Text Available El iPhone es un dispositivo móvil que lleva cerca de cinco años en el mercado de celulares, y sus funciones van más allá del uso como tal de un teléfono celular, gracias al App Store, que ofrece miles de aplicaciones creadas por desarrolladores alrededor del mundo. La arquitectura y el sistema operativo del iPhone permiten que las aplicaciones creadas por desarrolladores usen tecnologías especializadas para diferentes tipos de usuarios, permitiendo incluir características como gráficos de alta definición o usar accesorios de hardware, haciendo uso de los frameworks soportados por la arquitectura del dispositivo; todo esto es posible crearlo gracias a las herramientas de desarrollo provistas por Apple. El almacenamiento y la persistencia de datos se ven plasmados en el desarrollo de una aplicación caso de estudio que hace uso de Core Data para el manejo de la información.

Spectrographic determination of impurities in magnesium metal

International Nuclear Information System (INIS)

Capdevila, C.; Diaz-Guerra, J. P.

1979-01-01

The spectrographic determination of trace quantities of Al, B, Cd, Co, Cr, Cu, Fe, Li, Hn, Mo, Ni and Si in magnesium metal is described. Samples are dissolved with HNO 3 and calcinate into MgO. In order to avoid losses of boron NH 4 OH is added to the nitric solution. Except for aluminium and chromium the analysis is performed through the use of the carrier distillation technique. These two impurities are determined by burning to completion the MgO. Among the compounds studied as carriers (AgCl, AgF, CsCl, CuF 2 , KCl and SrF 2 ) AgCl allows, In general, the best volatilization efficiency. Lithium determination is achieved by using KC1 or CsCl. Detection limits, on the basis of MgO, are in the range 0,1 to 30 ppm, depending on the element. (Author) 8 refs

miCole, Social Media for Schools: Estudio de tecnologías para el desarrollo de aplicaciones móviles híbridas.

OpenAIRE

Bárcena Díez, Jaime

2017-01-01

El objetivo de este proyecto consiste en dar al lector una visión global sobre los diferentes tipos de aplicaciones para dispositivos móviles según su forma de desarrollo. Grado en Ingeniería Informática de Servicios y Aplicaciones

Project overview of OPTIMOS-EVE: the fibre-fed multi-object spectrograph for the E-ELT

NARCIS (Netherlands)

Navarro, R.; Chemla, F.; Bonifacio, P.; Flores, H.; Guinouard, I.; Huet, J.-M.; Puech, M.; Royer, F.; Pragt, J.H.; Wulterkens, G.; Sawyer, E.C.; Caldwell, M.E.; Tosh, I.A.J.; Whalley, M.S.; Woodhouse, G.F.W.; Spanò, P.; Di Marcantonio, P.; Andersen, M.I.; Dalton, G.B.; Kaper, L.; Hammer, F.

2010-01-01

OPTIMOS-EVE (OPTical Infrared Multi Object Spectrograph - Extreme Visual Explorer) is the fibre fed multi object spectrograph proposed for the European Extremely Large Telescope (E-ELT), planned to be operational in 2018 at Cerro Armazones (Chile). It is designed to provide a spectral resolution of

The Using of Used Battery as Alternative Electrode for Emission Spectrograph

International Nuclear Information System (INIS)

Arif Artadi; Sudaryo; Aryadi

2007-01-01

Analysis of boron (B) and cadmium (Cd) in U 3 O 8 has been carried out by using used battery electrode at emission spectrograph method. Analysis was done with the DC-Arc method, 10 Ampere current, 220 voltage, 25 second exposure time, and 2 mm electrode apart. The sample was extracted using TBP-Kerosine with the ratio of 70 : 30 volume of 200 ml. Water phase as the extraction result was dripped on electrode and excited. Intensity of the samples were compared to its standard, then it was obtained boron and cadmium concentration in sample were 0.07 ppm and 0.15 ppm respectively. The analysis result of boron and cadmium concentration in the sample using battery electrode were 0.21 ppm and 0.14 ppm respectively. (author)

Spectrographic determination of lithium in nuclear grade calcium

International Nuclear Information System (INIS)

Artaud, J.; Cittanova, J.

1957-01-01

A method is described for the spectrographic determination of lithium in calcium. The samples are converted directly to CaCO 3 . A method of fractional distillation in the arc, using KCl as carrier, makes it possible to detect and measure the Li content to 0,1 ppm. (author) [fr

Near InfraRed Imaging Spectrograph (NIRIS) for ground-based ...

Indian Academy of Sciences (India)

54

NIRIS is a large field-of-view imaging spectrograph which is sensitive to fluctuation in ..... enhancement over low-latitudes has been shown to be developed as a ..... step forward towards passive remote sensing of the mesospheric dynamics.

Formación de usuarios de la información mediante aplicaciones Web 2.0

Directory of Open Access Journals (Sweden)

Eder Ávila Barrientos

2015-04-01

Full Text Available Objetivo: Analizar las aplicaciones web 2.0 para estimar su utilización en los programas de formación de usuarios de la información. Método: Análisis documental y la hermenéutica del discurso aplicados a los documentos impresos y digitales que abordan la temática del objeto de estudio. Resultados: se responden una serie de cuestionamientos relacionados con la integración de las aplicaciones Web 2.0 en el diseño de programas de formación de usuarios de la información. En lo que respecta a la selección de aplicaciones web 2.0, se empleo la técnica de análisis de atributos basada en las variables de uso didáctico. Concluisones: Las tecnologías de la web 2.0 y su integración en los programas de formación de usuarios de la información, representan un nicho de oportunidad para los bibliotecólogos. Una oportunidad para alcanzar el futuro y romper viejos paradigmas de la formación de usurios.

Aplicaciones Web para el desarrollo sostenible a través de ONG

OpenAIRE

García Miguel, Daniel

2008-01-01

La meta de este proyecto es facilitar el acceso de las ONG a la tecnología Web, y concretamente las aplicaciones Web, para que aquellas que no tengan acceso a servicios profesionales, puedan ser autosufidentes en el desarrollo de sus propias soluciones.

WAS: the data archive for the WEAVE spectrograph

NARCIS (Netherlands)

Guerra, Jose; Molinari, Emilio; Lodi, Marcello; Martin, Adrian; Dalton, Gavin B.; Trager, Scott C.; Jin, Shoko; Abrams, Don Carlos; Bonifacio, Piercarlo; López Aguerri, Jose Alfonso; Vallenari, Antonella; Carrasco Licea, Esperanza E.; Middleton, Kevin F.

2016-01-01

The WAS1(WEAVE Archive System) is a software architecture for archiving and delivering the data releases for the WEAVE7 instrument at WHT (William Herschel Telescope). The WEAVE spectrograph will be mounted at the 4.2-m WHT telescope and will provide millions of spectra in a 5-year program, starting

Magnetic spectrograph with a semicircular focusing for studies on the energy distribution of a high-current relativistic electron beam

International Nuclear Information System (INIS)

Gosteva, T.S.; Zablotskaya, G.R.; Ivanov, B.A.; Kolyubakin, S.A.; Chernobrovin, V.I.

1975-01-01

Specific features of a magnetic spectrograph with a semicircular focusing are described; the spectrograph has been designed to study, using the REP-5 pulsed accelerator, the energy spectra of electrons with a current of 50 kA, pulse duration of 20 ns in the energy range 0.2 to 3 MeV. The beam has been transported in a drift chamber where the air pressure varies from 10 -3 to 40 torr. The chamber is 50 cm long and 12 cm in diameter. The spectrograph vacuum chamber is made in the form of a plane rectangular box with a degassing fitting. The uniform magnetic field in the spectrograph gap is provided with permanent magnets (ferrite-barium plates). The collimator and the chamber walls on which the magnets are located, are made of low-carbon electrotechnical steel. The diameters of the collimator entrance and exit windows are 2 and 0.2 mm, respectively. To screen the photofilm in the spectrograph chamber from x-radiation, there are three disks on the spectrograph flange on the part of the drift chamber, they are made of lead, steel, and aluminium. The steel disk, besides, screens the space in front of the collimator entrance window from the scattered magnetic field. During the experiments the pressure in the spectrograph chamber has varied from 7x10 -3 to 10 -1 torr. Electrons are registered using the RT-1 and RT-5 x-ray films 1x18 cm in size. The spectrograph described makes it possible to have well-resolved electron spectrum during a pulse. The electron spectra obtained by means of the spectrograph at a pressure of 4.10 -1 torr in the drift chamber and a charge voltage of 3.2 MV in the line, are shown [ru

The Coude spectrograph and echelle scanner of the 2.7 m telescope at McDonald observatory

Science.gov (United States)

Tull, R. G.

1972-01-01

The design of the Coude spectrograph of the 2.7 m McDonald telescope is discussed. A description is given of the Coude scanner which uses the spectrograph optics, the configuration of the large echelle and the computer scanner control and data systems.

Gestión de organizaciones: enfoques y aplicaciones

OpenAIRE

Zárate, Rodrigo; Argüelles Pabón, Denise Caroline; Aparicio García, Santiago; Largacha Martínez, Carlos; Pérez Uribe, Rafael; de la Hoz, Gerardo A.

2013-01-01

Una buena gestión puede transformar una organización. El libro Gestion de organizaciones enfoques y aplicaciones, realiza un análisis de todos los aspectos relevantes que llevan a una organización a generar nuevas y mejores prácticas para el impulso de su productividad y competitividad. se estudian diferentes modelos de gestión con el fin de potencializar el aprendizaje organizacional, es decir la gestión del conocimiento, del talento y la gestión por competencias....

Spectrographic determination of trace impurities in reactor grade aluminium

International Nuclear Information System (INIS)

Chandola, L.C.; Machado, I.J.

1975-01-01

A spectrographic method enabling the determination of 21 trace impurities in aluminium oxide is described. The technique involves mixing the sample with graphite buffer in the ratio 1:1, loading it in a graphite electrode and arcing it for 30 sec. in a dc arc to 10 A current against a pointed graphite cathode. The spectra are photographed on Ilford N.30 emulsion employing a large quartz spectrograph. The aluminium line at 2669.2 A 0 serves as the internal standard. The impurities determined are Ag, B, Bi, Cd, Co, Cr, Cu, Fe, Ga, In, Mg, Mo, Ni, Pb, Sb, Si, Sn, Ti, V and Zn. The sensitivity varies from 5 to 100 ppm and the precision from +- 5 to +- 22% for different elements. A method for converting aluminium metal to aluminium oxide is described. It is found that boron is not lost during this conversion. (author)

Desarrollo de aplicaciones móviles bajo la plataforma de Iphone

Directory of Open Access Journals (Sweden)

Karen Melissa Rojas Lizarazo

2012-05-01

Full Text Available El iPhone es un dispositivo móvil que lleva cerca de cinco años en el mercado de celulares, y sus funciones van más allá del uso como tal de un teléfono celular, gracias al App Store, que ofrece miles de aplicaciones creadas por desarrolladores alrededor del mundo. La arquitectura y el sistema operativo del iPhone permiten que las aplicaciones creadas por desarrolladores usen tecnologías especializadas para diferentes tipos de usuarios, permitiendo incluir características como gráficos de alta definición o usar accesorios de hardware, haciendo uso de los frameworks soportados por la arquitectura del dispositivo; todo esto es posible crearlo gracias a las herramientas de desarrollo provistas por Apple. El almacenamiento y la persistencia de datos se ven plasmados en el desarrollo de una aplicación caso de estudio que hace uso de Core Data para el manejo de la información.

DESCRIPCIÓN DE UN FRAMEWORK METODOLOGICO PARA EL DESARROLLO DE APLICACIONES RELACIONADAS CON EL PATRIMONIO CULTURAL

Directory of Open Access Journals (Sweden)

Edwin Mauricio Hincapié-Montoya

2014-01-01

Full Text Available Preservar los espacios y difundirlos es una función social que debe mantener unidos a los pueblos y que no puede dejarse a un lado por el clamor y la voz del desarrollo. Para ello la tecnología juega un papel de facilitador mediático a través de la cual se puede llegar a diferentes espacios y lugares históricamente importantes pero físicamente inaccesibles por su desaparición. En los últimos años se han desarrollado aplicaciones que buscan reactivar el patrimonio cultural y hacen uso de tecnologías como realidad virtual, realidad aumentada o juegos serios. Sin embargo, la mayoría son casos de estudio en un tema particular y el área carece de un framework metodológico, que guie y facilite el desarrollo de este tipo de aplicaciones. En este articulo proponemos un framework metodológico conceptual, el cual busca guiar el desarrollo de aplicaciones relacionadas con la reactivación del patrimonio cultural al tiempo que maximiza el aprendizaje de los usuarios en este tema.

Un modelo de coordinación cliente-servidor, de apoyo a la construcción de aplicaciones colaborativas portables

OpenAIRE

Ochoa, Sergio; Fuller, David A.

2001-01-01

En la actualidad existe una gran variedad de plataformas de apoyo al desarrollo de aplicaciones colaborativas, que trabajan bajo una arquitectura cliente-servidor [Chabert 98, Guerrero 98, Licea 98, Trevor 97]. Estas poseen un alto grado de incompatibilidad entre ellas, lo cual produce una fuerte dependencia de la aplicación cliente, hacia el servidor usado. Debido a esto, las capacidades de las aplicaciones están sometidas a la funcionalidad permitida por el servidor. Esto entorpece el avanc...

Laboratory Testing and Performance Verification of the CHARIS Integral Field Spectrograph

Science.gov (United States)

Groff, Tyler D.; Chilcote, Jeffrey; Kasdin, N. Jeremy; Galvin, Michael; Loomis, Craig; Carr, Michael A.; Brandt, Timothy; Knapp, Gillian; Limbach, Mary Anne; Guyon, Olivier;

The spectrographic orbit of the eclipsing binary HH Carinae

International Nuclear Information System (INIS)

Mandrini, C.H.; Mendez, R.H.; Niemela, V.S.; Ferrer, O.E.

1985-01-01

We present a radial velocity study of the eclipsing binary system HH Carinae, and determine for the first time its spectrographic orbital elements. Using the results of a previous photometric study by Soderhjelm, we also determine the values of the masses and dimensions of the binary components. (author)

Quantitative analysis of selected minor and trace elements through use of a computerized automatic x-ray spectrograph

International Nuclear Information System (INIS)

Fabbi, B.P.; Elsheimer, H.N.; Espos, L.F.

1976-01-01

Upgrading a manual X-ray spectrograph, interfacing with an 8K computer, and employment of interelement correction programs have resulted in a several-fold increase in productivity for routine quantitative analysis and an accompanying decrease in operator bias both in measurement procedures and in calculations. Factors such as dead time and self-absorption also are now computer corrected, resulting in improved accuracy. All conditions of analysis except for the X-ray tube voltage are controlled by the computer, which enhances precision of analysis. Elemental intensities are corrected for matrix effects, and from these the percent concentrations are calculated and printed via teletype. Interelement correction programs utilizing multiple linear regression are employed for the determination of the following minor and trace elements: K, S, Rb, Sr, Y, and Zr in silicate rocks, and Ba, As, Sb, and Zn in both silicate and carbonate rock samples. The last named elements use the same regression curves for both rock types. All these elements are determined in concentrations generally ranging from 0.0025 percent to 4.00 percent. The sensitivities obtainable range from 0.0001 percent for barium to 0.001 percent for antimony. The accuracy, as measured by the percent relative error for a variety of silicate and carbonate rocks, is on the order of 1-7 percent. The exception is yttrium

An echelle spectrograph for middle ultraviolet solar spectroscopy from rockets.

Science.gov (United States)

Tousey, R; Purcell, J D; Garrett, D L

1967-03-01

An echelle grating spectrograph is ideal for use in a rocket when high resolution is required becaus itoccupies a minimum of space. The instrument described covers the range 4000-2000 A with a resolution of 0.03 A. It was designed to fit into the solar biaxial pointing-control section of an Aerobee-150 rocket. The characteristics of the spectrograph are illustrated with laboratory spectra of iron and carbon are sources and with solar spectra obtained during rocket flights in 1961 and 1964. Problems encountered in analyzing the spectra are discussed. The most difficult design problem was the elimination of stray light when used with the sun. Of the several methods investigated, the most effective was a predispersing system in the form of a zero-dispersion double monochromator. This was made compact by folding the beam four times.

Framework Orientado a Aspectos de Recopilación Automática de Datos para la Evolución de Usabilidad en Aplicaciones Web

Directory of Open Access Journals (Sweden)

Roberto Farias

2016-08-01

Full Text Available La Usabilidad consiste de un conjunto de atributos que permiten evaluar el esfuerzo que deberá invertir un usuario para realizar una tarea determinada a través de la utilización de un software específico. En este sentido, una aplicación se considerará más usable cuanto menos esfuerzo requiera para su utilización. En la actualidad, la World Wide Web, se ha constituido como un enorme repositorio de información que es presentada y puesta a disposición de los usuarios a través de diversos sitios o páginas web cuya finalidad es promover el acceso a la información y de esta manera,  garantizar la igualdad de oportunidades a quienes la consumen. Por otro lado, la evolución de las tecnologías que le dan soporte, la han convertido en una plataforma tecnológica sobre la cual es posible desarrollar aplicaciones con un nivel de interacción y funcionalidad similar al de las aplicaciones de escritorio (WIMP. Existen una gran variedad de trabajos sobre usabilidad web, centrados principalmente en aspectos tales como la navegación y la arquitectura de información de los sitios o páginas web. Sin embargo, la usabilidad de las aplicaciones web, que experimentan un alto grado de interacción con el usuario (action-oriented similar al de las aplicaciones de escritorio, no puede ser evaluadas de la misma manera que en un sitio web (information-oriented donde la interacción con el usuario es escasa y limitada. Si bien pueden encontrarse una diversidad de trabajos que tratan como objeto de estudio a la usabilidad en aplicaciones, en entornos de escritorio ó moviles, no se han reconocido trabajos referidos a la usabilidad de aplicaciones en entornos web. En este trabajo, se propone un framework basado en AOP, capaz de dar soporte al proceso de evaluación de usabilidad, en aplicaciones web, durante la ejecución de tareas de usuario.

Spectrographic temperature measurement of a high power breakdown arc in a high pressure gas switch

Energy Technology Data Exchange (ETDEWEB)

Yeckel, Christopher; Curry, Randy [Department of Computer and Electrical Engineering, Center for Physical and Power Electronics, University of Missouri--Columbia, Columbia, Missouri 65211 (United States)

2011-09-15

A procedure for obtaining an approximate temperature value of conducting plasma generated during self-break closure of a RIMFIRE gas switch is described. The plasma is in the form of a breakdown arc which conducts approximately 12 kJ of energy in 1 {mu}s. A spectrographic analysis of the trigger-section of the 6-MV RIMFIRE laser triggered gas switch used in Sandia National Laboratory's ''Z-Machine'' has been made. It is assumed that the breakdown plasma has sufficiently approached local thermodynamic equilibrium allowing a black-body temperature model to be applied. This model allows the plasma temperature and radiated power to be approximated. The gas dielectric used in these tests was pressurized SF{sub 6}. The electrode gap is set at 4.59 cm for each test. The electrode material is stainless steel and insulator material is poly(methyl methacrylate). A spectrum range from 220 to 550 nanometers has been observed and calibrated using two spectral irradiance lamps and three spectrograph gratings. The approximate plasma temperature is reported.

Proton polarimetry using an Enge split-pole spectrograph

Energy Technology Data Exchange (ETDEWEB)

Moss, J M; Brown, D R; Cornelius, W D [Texas Agricultural and Mechanical Univ., College Station (USA). Cyclotron Inst.

1976-05-15

A high-efficiency (4 x 10/sup -5/ at A=0.4) high resolution (150 keV) polarimeter used in conjunction with an Enge split-pole spectrograph is described. This device permits for the first time polarization transfer studies in elastic scattering. Spectra are shown for /sup 11/B(p(pol),p(pol)')/sup 11/B (2.14 MeV)at Esub(p)=31 MeV.

Aplicaciones de redes neuronales en economía.

Directory of Open Access Journals (Sweden)

Pacheco Bonrostro, J.

1997-01-01

Full Text Available La metodología de las Redes Neuronales Artificiales, está siendo usada con profusión, dentro del campo de la Economía, hasta tal punto que existe una publicación bimensual, que trata específicamente estas aplicaciones a los mercados financieros: Neurove$t Journal. En este trabajo, se presentan las principales líneas de investigación existentes, a continuación la que nosotros estamos siguiendo, con algunos resultados iniciales, para finalizar con las líneas a seguir y una selección bibliográfica.

Haré un dibujo aprovechando esta nada. Aplicaciones de dibujo en freeware y opensource

OpenAIRE

Horcajada González, Ricardo

2012-01-01

Breve presentación de la tipología más común de los diferentes programas de sofware libre dedicados al dibujo que pueden encontrarse como freeware en internet. Aplicaciones y distribución de las imágenes.

Implantes personalizados de polimetilmetacrilato (PMMA) para aplicaciones en craneoplastia

OpenAIRE

Arango Ospina, Marcela

2014-01-01

Los implantes a la medida para aplicaciones en craneoplastias tienen el objetivo de restaurar la protección del cerebro que el cráneo proporcionaba y mejorar el aspecto de la superficie después de sufrir un traumatismo o para corregir una malformación. Los principales inconvenientes del procedimiento de craneoplastia incluyen la individualización de la geometría y las propiedades mecánicas del implante para que sea funcional. El objetivo de nuestra investigación fue proponer un...

First observations from a CCD all-sky spectrograph at Barentsburg (Spitsbergen

Directory of Open Access Journals (Sweden)

S. A. Chernouss

2008-05-01

Full Text Available A digital CCD all-sky spectrograph was made by the Polar Geophysical Institute (PGI to support IPY activity in auroral research. The device was tested at the Barentsburg observatory of PGI during the winter season of 2005–2006. The spectrograph is based on a cooled CCD and a transmission grating. The main features of this spectrograph are: a wide field of view (~180°, a wide spectral range (380–740 nm, a spectral resolution of 0.6 nm, a background level of about 100 R at 1-min exposure time. Several thousand spectra of nightglow and aurora were recorded during the observation season. It was possible to register both the strong auroral emissions, as well as weak ones. Spectra of aurora, including nitrogen and oxygen molecular and atomic emissions, as well as OH emissions of the nightglow are shown. A comparison has been conducted of auroral spectra obtained by the film all-sky spectral camera C-180-S at Spitsbergen during IGY, with spectra obtained at Barentsburg during the last winter season. The relationship between the red (630.0 nm and green (557.7 nm auroral emissions shows that the green emission is dominant near the minimum of the solar cycle activity (2005–2006. The opposite situation is observed during 1958–1959, with a maximum solar cycle activity.

Spectrographic determination of impurities in copper and copper oxide

International Nuclear Information System (INIS)

Sabato, S.F.; Lordello, A.R.

1990-11-01

An emission spectrographic method for the determination of Al, Bi, Ca, Cd, Cr, Fe, Ge, Mg, Mn, Mo, Ni, Pb, Sb, Si, Sn and Zn in copper and copper oxide is described. Two mixtures (Graphite and ZnO: graphite and GeO sub(2)) were used as buffers. The standard deviation lies around 10%. (author)

Initial results from the fast imaging solar spectrograph (FISS)

CERN Document Server

2015-01-01

This collection of papers describes the instrument and initial results obtained from the Fast Imaging Solar Spectrograph (FISS),  one of the post-focus instruments of the 1.6 meter New Solar Telescope at the Big Bear Solar Observatory. The FISS primarily aims at investigating structures and dynamics of  chromospheric features. This instrument is a dual-band Echelle spectrograph optimized for the simultaneous recording of the H I 656.3 nm band and the Ca II 854.2 nm band. The imaging is done with the fast raster scan realized by the linear motion of a two-mirror scanner, and its quality is determined by the performance of the adaptive optics of the telescope.    These papers illustrate the capability of the early FISS observations in the study of chromospheric features. Since the imaging quality has been improved a lot with the advance of the adaptive optics, one can obtain much better data with the current FISS observations.        This volume is aimed at graduate students and researchers working in...

Las aplicaciones interactivas multimedia en España: ¿hacia dónde evoluciona el mercado?

Directory of Open Access Journals (Sweden)

Lic. Nati Ramajo Hernández

1998-01-01

Full Text Available El despegue del sector multimedia en nuestro país (entendiendo como tal las aplicaciones interactivas multimedia ha sido espectacular en los últimos tiempos. El número de títulos publicados en CD-ROM, al igual que el número de productores, ha aumentado considerablemente. Pero, ¿cómo es esa nueva industria?, ¿qué productos ofrece?, ¿hacia dónde evoluciona el mercado? El presente trabajo pretende hacer un repaso a la breve historia de las aplicaciones interactivas multimedia en España hasta llegar al momento actual, analizando por el camino la tipología de los productos y concluyendo con los nuevos formatos que están cambiando el mercado.

Arquitecturas multiprocesador en HPC: software, métricas y aplicaciones

OpenAIRE

De Giusti, Armando Eduardo; Tinetti, Fernando Gustavo; Naiouf, Marcelo; Chichizola, Franco; De Giusti, Laura Cristina; Villagarcía Wanza, Horacio A.; Montezanti, Diego Miguel; Encinas, Diego; Pousa, Adrián; Rodriguez, Ismael Pablo; Eguren, Sebastián; Iglesias, Luciano; Paniego, Juan Manuel; Pi Puig, Martín; Dell'Oso, Matías

2016-01-01

Caracterizar las arquitecturas multiprocesador distribuidas enfocadas especialmente a cluster y cloud computing, con énfasis en las que utilizan procesadores de múltiples núcleos (multicores, GPUs y Xeon Phi), con el objetivo de modelizarlas, estudiar su escalabilidad, analizar y predecir performance de aplicaciones paralelas, estudiar el consumo energético y su impacto en la perfomance así como desarrollar esquemas para detección y tolerancia a fallas en las mismas. Profundizar el estudio...

Mass production of volume phase holographic gratings for the VIRUS spectrograph array

Science.gov (United States)

Chonis, Taylor S.; Frantz, Amy; Hill, Gary J.; Clemens, J. Christopher; Lee, Hanshin; Tuttle, Sarah E.; Adams, Joshua J.; Marshall, J. L.; DePoy, D. L.; Prochaska, Travis

2014-07-01

The Visible Integral-field Replicable Unit Spectrograph (VIRUS) is a baseline array of 150 copies of a simple, fiber-fed integral field spectrograph that will be deployed on the Hobby-Eberly Telescope (HET). VIRUS is the first optical astronomical instrument to be replicated on an industrial scale, and represents a relatively inexpensive solution for carrying out large-area spectroscopic surveys, such as the HET Dark Energy Experiment (HETDEX). Each spectrograph contains a volume phase holographic (VPH) grating with a 138 mm diameter clear aperture as its dispersing element. The instrument utilizes the grating in first-order for 350 VPH gratings has been mass produced for VIRUS. Here, we present the design of the VIRUS VPH gratings and a discussion of their mass production. We additionally present the design and functionality of a custom apparatus that has been used to rapidly test the first-order diffraction efficiency of the gratings for various discrete wavelengths within the VIRUS spectral range. This device has been used to perform both in-situ tests to monitor the effects of adjustments to the production prescription as well as to carry out the final acceptance tests of the gratings' diffraction efficiency. Finally, we present the as-built performance results for the entire suite of VPH gratings.

Aplicaciones Nutraceúticas y cosmeceúticas de las algas

OpenAIRE

López-Figueroa, Félix

2017-01-01

El uso de la biomasa algal en diversas aplicaciones biotecnológicas ha experimentado un gran desarrollo en los últimos años. El crecimiento de las publicaciones científicas con contenidos como “extractos de algas”, “compuestos bioactivos de algas”, “biorremediación” o ”cosmética con algas” ha sido exponencial. Dentro de la Biotecnología azul se ha generado un mercado muy dinámico en el que la acuicultura, cosméticos, nutracéuticos e ingredientes funcionales tienen un gran peso. Los campos ...

Mindfulness: Conceptos generales, psicoterapia y aplicaciones clínicas.

OpenAIRE

Vásquez-Dextre, Edgar R.

2016-01-01

El objetivo de este artículo es presentar una revisión sobre el concepto de Mindfulness, su uso en la psicoterapia y sus aplicaciones clínicas. Mindfulness es una técnica de meditación que consiste en observar la realidad en el momento presente, sin intenciones de juzgar y conplena apertura y aceptación. Existen terapias que usan Mindfulness dentro de su estructura y sus programas, tales como como la Terapia Dialéctico-Conductual y la Reducción del Estrés basada en Mindfulness. Mindfulness ha...

The Oxford SWIFT Spectrograph: first commissioning and on-sky results

Science.gov (United States)

Thatte, Niranjan; Tecza, Mathias; Clarke, Fraser; Goodsall, Timothy; Fogarty, Lisa; Houghton, Ryan; Salter, Graeme; Scott, Nicholas; Davies, Roger L.; Bouchez, Antonin; Dekany, Richard

2010-07-01

The Oxford SWIFT spectrograph, an I & z band (6500-10500 A) integral field spectrograph, is designed to operate as a facility instrument at the 200 inch Hale Telescope on Palomar Mountain, in conjunction with the Palomar laser guide star adaptive optics system PALAO (and its upgrade to PALM3000). SWIFT provides spectra at R(≡λ/▵λ)~4000 of a contiguous two-dimensional field, 44 x 89 spatial pixels (spaxels) in size, at spatial scales of 0.235", 0.16", and 0.08" per spaxel. It employs two 250μm thick, fully depleted, extremely red sensitive 4k X 2k CCD detector arrays (manufactured by LBNL) that provide excellent quantum efficiency out to 1000 nm. We describe the commissioning observations and present the measured values of a number of instrument parameters. We also present some first science results that give a taste of the range of science programs where SWIFT can have a substantial impact.

Application of frequency converters in industry; Aplicacion de convertidores de frecuencia en la industria

Energy Technology Data Exchange (ETDEWEB)

Delmar Saavedra, Alejandro [Eficiencia Energetica, S.A. de C.V., Mexico, D. F. (Mexico)

1999-07-01

Next an analysis methodology for the application of a frequency converter in equipment that handles flows, as they can be pumps, fans, blowers and extractors is presented. Measurements of some practical cases that we have had in the industry are shown. Some of the types of applications in which the control of speed with the frequency converter is used, are the following ones: pumps, fans, mills, crushing machines, extruders, Banbury mixers, spinning machines, conveyors, mixers, electrical vehicles, lime furnaces, injection machines, blowers and extractors. The purpose of a frequency converter is of controlling the speed and/or torque of an electrical motor. The reasons for which a frequency converter is used can be classified, in two large fields: the necessary and those that provide energy saving. [Spanish] A continuacion se presenta una metodologia de analisis para la aplicacion de un convertidor de frecuencia en equipos que manejan flujos, como pueden ser bombas, ventiladores, sopladores y extractores. Se muestran mediciones de algunos casos practicos que hemos tenido en la industria. Algunos de los tipos de aplicaciones en donde se usa el control de velocidad con el convertidor de frecuencia, son los siguientes: bombas, ventiladores, molinos, trituradoras, extrusoras, mezcladoras banbury, maquinas de hilado, transportadoras, mezcladoras, vehiculos electricos, horno de cal, maquinas de inyeccion, sopladores y extractores. El proposito de un convertidor de frecuencia es el de controlar la velocidad y/o par en un motor electrico. Se pueden, clasificar las razones por las que se usa un convertidor de frecuencia, en dos grandes campos: las necesarias y las que proporcionan ahorros de energia.

Paralelización de aplicaciones econométricas que requieren estimación de los modelos de elección discreta

OpenAIRE

Trigila, Mariano; Di Pasquale, Ricardo

2016-01-01

En las últimas dos décadas, el uso eficiente del hardware para aplicaciones científicas fue creciendo en dificultad. Además, muchas de estas aplicaciones requieren mejorar el rendimiento del procesamiento y tratar datos masivos. Estos son sistemas complejos de implementar y en especial para aquellos que no son especialista en computación. Es necesario desarrollar e implementar abstracciones de programación de alto nivel que permitan modelos de programación simples de usar. Las aplica...

Opto-mechanical design of an image slicer for the GRIS spectrograph at GREGOR

Science.gov (United States)

Vega Reyes, N.; Esteves, M. A.; Sánchez-Capuchino, J.; Salaun, Y.; López, R. L.; Gracia, F.; Estrada Herrera, P.; Grivel, C.; Vaz Cedillo, J. J.; Collados, M.

2016-07-01

An image slicer has been proposed for the Integral Field Spectrograph [1] of the 4-m European Solar Telescope (EST) [2] The image slicer for EST is called MuSICa (Multi-Slit Image slicer based on collimator-Camera) [3] and it is a telecentric system with diffraction limited optical quality offering the possibility to obtain high resolution Integral Field Solar Spectroscopy or Spectro-polarimetry by coupling a polarimeter after the generated slit (or slits). Considering the technical complexity of the proposed Integral Field Unit (IFU), a prototype has been designed for the GRIS spectrograph at GREGOR telescope at Teide Observatory (Tenerife), composed by the optical elements of the image slicer itself, a scanning system (to cover a larger field of view with sequential adjacent measurements) and an appropriate re-imaging system. All these subsystems are placed in a bench, specially designed to facilitate their alignment, integration and verification, and their easy installation in front of the spectrograph. This communication describes the opto-mechanical solution adopted to upgrade GRIS while ensuring repeatability between the observational modes, IFU and long-slit. Results from several tests which have been performed to validate the opto-mechanical prototypes are also presented.

Effect of Acoustic Spectrographic Instruction on Production of English /i/ and /I/ by Spanish Pre-Service English Teachers

Science.gov (United States)

Quintana-Lara, Marcela

2014-01-01

This study investigates the effects of Acoustic Spectrographic Instruction on the production of the English phonological contrast /i/ and / I /. Acoustic Spectrographic Instruction is based on the assumption that physical representations of speech sounds and spectrography allow learners to objectively see and modify those non-accurate features in…

Exact optics - III. Schwarzschild's spectrograph camera revised

Science.gov (United States)

Willstrop, R. V.

2004-03-01

Karl Schwarzschild identified a system of two mirrors, each defined by conic sections, free of third-order spherical aberration, coma and astigmatism, and with a flat focal surface. He considered it impractical, because the field was too restricted. This system was rediscovered as a quadratic approximation to one of Lynden-Bell's `exact optics' designs which have wider fields. Thus the `exact optics' version has a moderate but useful field, with excellent definition, suitable for a spectrograph camera. The mirrors are strongly aspheric in both the Schwarzschild design and the exact optics version.

Propiedades y aplicaciones de los materiales aislantes a base de vidrio espumado

Directory of Open Access Journals (Sweden)

Sánchez Castro, Carlos

1958-02-01

Full Text Available Not availableEn un artículo precedente, aparecido en el núm. 82 de U. A. M. C., se definieron y estudiaron brevemente los materiales aislantes a base de vidrio espumado -Foamglas-, dedicándose una atención más amplia a los procedimientos y ensayos de laboratorio, realizados para obtener la máxima espumación del producto. Entonces sólo se mencionaron algunas de sus características y propiedades más importantes; también se indicaron, sin entrar en detalles, algunas de sus aplicaciones. Seguidamente, y como complemento de lo anteriormente dicho, se van a enumerar: las características de este material, pesos específicos, coeficientes de aislamiento, resistencias, etc.; los productos que con él se fabrican, bloques, planchas, coquillas, etc.; y las distintas aplicaciones que tiene en la construcción y en otras industrias, a las cuales beneficia con su colaboración, resolviendo problemas de aislamiento, aligeramiento de peso, etc. En distintas fotografías se presentan algunos ejemplos de aislamiento, de edificios, fijación de piezas y enlucido o revestimiento de los paramentos realizados con este producto.

Potenciales aplicaciones de Moringa oleifera. Una revisión crítica

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C Martín

Full Text Available Moringa oleifera es un árbol originario de la India al que se le atribuyen múltiples beneficios para el bienestar humano. Es de crecimiento rápido, de relativamente poca exigencia hacia el suelo y se cultiva en toda la franja intertropical. Uno de los principales usos de sus hojas y de la torta de prensado de su semilla es en la formulación de raciones para la alimentación animal. Sin embargo, prácticamente todas las partes del árbol tienen diversas aplicaciones, sobre lo cual existen testimonios que se remontan a la Antigüedad. En este trabajo se hace una revisión de la literatura disponible sobre la utilización de esta planta. Se presentan distintos campos de aplicación de M. oleifera a la luz del creciente interés científico que ha generado en los últimos lustros. El objetivo es presentar las evidencias aportadas por la literatura científica que confirman y explican las propiedades y aplicaciones de la moringa, las cuales se distancian de versiones sin confirmar aportadas por la literatura popular y la publicidad.

MSE spectrograph optical design: a novel pupil slicing technique

Science.gov (United States)

Spanò, P.

2014-07-01

The Maunakea Spectroscopic Explorer shall be mainly devoted to perform deep, wide-field, spectroscopic surveys at spectral resolutions from ~2000 to ~20000, at visible and near-infrared wavelengths. Simultaneous spectral coverage at low resolution is required, while at high resolution only selected windows can be covered. Moreover, very high multiplexing (3200 objects) must be obtained at low resolution. At higher resolutions a decreased number of objects (~800) can be observed. To meet such high demanding requirements, a fiber-fed multi-object spectrograph concept has been designed by pupil-slicing the collimated beam, followed by multiple dispersive and camera optics. Different resolution modes are obtained by introducing anamorphic lenslets in front of the fiber arrays. The spectrograph is able to switch between three resolution modes (2000, 6500, 20000) by removing the anamorphic lenses and exchanging gratings. Camera lenses are fixed in place to increase stability. To enhance throughput, VPH first-order gratings has been preferred over echelle gratings. Moreover, throughput is kept high over all wavelength ranges by splitting light into more arms by dichroic beamsplitters and optimizing efficiency for each channel by proper selection of glass materials, coatings, and grating parameters.

Opto-mechanical design of a new cross dispersion unit for the CRIRES+ high resolution spectrograph for the VLT

Science.gov (United States)

Lizon, Jean Louis; Klein, Barbara; Oliva, Ernesto; Löwinger, Tom; Anglada Escude, Guillem; Baade, Dietrich; Bristow, Paul; Dorn, Reinhold J.; Follert, Roman; Grunhut, Jason; Hatzes, Artie; Heiter, Ulrike; Ives, Derek; Jung, Yves; Kerber, Florian; Lockhart, Matt; Marquart, Thomas; Origlia, Livia; Pasquini, Luca; Paufique, Jerome; Piskunov, N.; Pozna, Eszter; Reiners, Ansgar; Smette, Alain; Smoker, Jonathan; Seemann, Ulf; Stempels, Eric; Valenti, Elena

2014-07-01

CRIRES is one of the few IR (0.92-5.2 μm) high-resolution spectrographs in operation at the VLT since 2006. Despite good performance it suffers a limitation that significantly hampers its ability: a small spectral coverage per exposure. The CRIRES upgrade (CRIRES+) proposes to transform CRIRES into a cross-dispersed spectrograph while maintaining the high resolution (100000) and increasing the wavelength coverage by a factor 10 compared to the current capabilities. A major part of the upgrade is the exchange of the actual cryogenic pre-disperser module by a new cross disperser unit. In addition to a completely new optical design, a number of important changes are required on key components and functions like the slit unit and detectors units. We will outline the design of these new units fitting inside a predefined and restricted space. The mechanical design of the new functions including a description and analysis will be presented. Finally we will present the strategy for the implementation of the changes.

Quantitative imaging through a spectrograph. 2. Stoichiometry mapping by Raman scattering.

NARCIS (Netherlands)

Tolboom, R.A.L.; Dam, N.J.; Meulen, J.J. ter

2004-01-01

The Bayesian deconvolution algorithm described in a preceding paper [Appl. Opt. 43, 5669-5681 (2004)] is applied to measurement of the two-dimensional stoichiometry field in a combustible methane-air mixture by Raman imaging through a spectrograph. Stoichiometry (fuel equivalence ratio) is derived

EL COMPROMISO EN LA TEORÍA DE LA VALORACIÓN: CONCEPTOS Y APLICACIONES PEDAGÓGICAS

Directory of Open Access Journals (Sweden)

Jesús David Guerra Lyons

2017-01-01

Full Text Available El presente artículo revisa el concepto de compromiso desde la Teoría de la Valoración propuesta por Martin y White y de algunas de sus aplicaciones pedagógicas. Desde la perspectiva bajtiniana de dialogismo, Martin y White definen el compromiso como el conjunto de recursos mediante los cuales los usuarios del lenguaje entran en diálogo con las múltiples voces que inevitablemente permean sus textos, aceptándolas, rebatiéndolas, retomándolas o distanciándose de ellas. El compromiso se divide en dos tipos: monoglosia y heteroglosia. Este último se desagrega en varias subcategorías, que son definidas e ilustradas con ejemplos tomados del corpus del español de Davies. Consideramos algunas aplicaciones pedagógicas del concepto de compromiso mediante la revisión de estudios desarrollados principalmente en el contexto latinoamericano.

Fiber Scrambling for High Precision Spectrographs

Science.gov (United States)

Kaplan, Zachary; Spronck, J. F. P.; Fischer, D.

2011-05-01

The detection of Earth-like exoplanets with the radial velocity method requires extreme Doppler precision and long-term stability in order to measure tiny reflex velocities in the host star. Recent planet searches have led to the detection of so called "super-Earths” (up to a few Earth masses) that induce radial velocity changes of about 1 m/s. However, the detection of true Earth analogs requires a precision of 10 cm/s. One of the largest factors limiting Doppler precision is variation in the Point Spread Function (PSF) from observation to observation due to changes in the illumination of the slit and spectrograph optics. Thus, this stability has become a focus of current instrumentation work. Fiber optics have been used since the 1980's to couple telescopes to high-precision spectrographs, initially for simpler mechanical design and control. However, fiber optics are also naturally efficient scramblers. Scrambling refers to a fiber's ability to produce an output beam independent of input. Our research is focused on characterizing the scrambling properties of several types of fibers, including circular, square and octagonal fibers. By measuring the intensity distribution after the fiber as a function of input beam position, we can simulate guiding errors that occur at an observatory. Through this, we can determine which fibers produce the most uniform outputs for the severest guiding errors, improving the PSF and allowing sub-m/s precision. However, extensive testing of fibers of supposedly identical core diameter, length and shape from the same manufacturer has revealed the "personality” of individual fibers. Personality describes differing intensity patterns for supposedly duplicate fibers illuminated identically. Here, we present our results on scrambling characterization as a function of fiber type, while studying individual fiber personality.

A fast new cadioptric design for fiber-fed spectrographs

Science.gov (United States)

Saunders, Will

2012-09-01

The next generation of massively multiplexed multi-object spectrographs (DESpec, SUMIRE, BigBOSS, 4MOST, HECTOR) demand fast, efficient and affordable spectrographs, with higher resolutions (R = 3000-5000) than current designs. Beam-size is a (relatively) free parameter in the design, but the properties of VPH gratings are such that, for fixed resolution and wavelength coverage, the effect on beam-size on overall VPH efficiency is very small. For alltransmissive cameras, this suggests modest beam-sizes (say 80-150mm) to minimize costs; while for cadioptric (Schmidt-type) cameras, much larger beam-sizes (say 250mm+) are preferred to improve image quality and to minimize obstruction losses. Schmidt designs have benefits in terms of image quality, camera speed and scattered light performance, and recent advances such as MRF technology mean that the required aspherics are no longer a prohibitive cost or risk. The main objections to traditional Schmidt designs are the inaccessibility of the detector package, and the loss in throughput caused by it being in the beam. With expected count rates and current read-noise technology, the gain in camera speed allowed by Schmidt optics largely compensates for the additional obstruction losses. However, future advances in readout technology may erase most of this compensation. A new Schmidt/Maksutov-derived design is presented, which differs from previous designs in having the detector package outside the camera, and adjacent to the spectrograph pupil. The telescope pupil already contains a hole at its center, because of the obstruction from the telescope top-end. With a 250mm beam, it is possible to largely hide a 6cm × 6cm detector package and its dewar within this hole. This means that the design achieves a very high efficiency, competitive with transmissive designs. The optics are excellent, as least as good as classic Schmidt designs, allowing F/1.25 or even faster cameras. The principal hardware has been costed at $300K per

THE MULTI-OBJECT, FIBER-FED SPECTROGRAPHS FOR THE SLOAN DIGITAL SKY SURVEY AND THE BARYON OSCILLATION SPECTROSCOPIC SURVEY

International Nuclear Information System (INIS)

Smee, Stephen A.; Barkhouser, Robert H.; Gunn, James E.; Carr, Michael A.; Lupton, Robert H.; Loomis, Craig; Uomoto, Alan; Roe, Natalie; Schlegel, David; Rockosi, Constance M.; Leger, French; Owen, Russell; Anderson, Lauren; Dawson, Kyle S.; Olmstead, Matthew D.; Brinkmann, Jon; Long, Dan; Honscheid, Klaus; Harding, Paul; Annis, James

2013-01-01

We present the design and performance of the multi-object fiber spectrographs for the Sloan Digital Sky Survey (SDSS) and their upgrade for the Baryon Oscillation Spectroscopic Survey (BOSS). Originally commissioned in Fall 1999 on the 2.5 m aperture Sloan Telescope at Apache Point Observatory, the spectrographs produced more than 1.5 million spectra for the SDSS and SDSS-II surveys, enabling a wide variety of Galactic and extra-galactic science including the first observation of baryon acoustic oscillations in 2005. The spectrographs were upgraded in 2009 and are currently in use for BOSS, the flagship survey of the third-generation SDSS-III project. BOSS will measure redshifts of 1.35 million massive galaxies to redshift 0.7 and Lyα absorption of 160,000 high redshift quasars over 10,000 deg 2 of sky, making percent level measurements of the absolute cosmic distance scale of the universe and placing tight constraints on the equation of state of dark energy. The twin multi-object fiber spectrographs utilize a simple optical layout with reflective collimators, gratings, all-refractive cameras, and state-of-the-art CCD detectors to produce hundreds of spectra simultaneously in two channels over a bandpass covering the near-ultraviolet to the near-infrared, with a resolving power R = λ/FWHM ∼ 2000. Building on proven heritage, the spectrographs were upgraded for BOSS with volume-phase holographic gratings and modern CCD detectors, improving the peak throughput by nearly a factor of two, extending the bandpass to cover 360 nm < λ < 1000 nm, and increasing the number of fibers from 640 to 1000 per exposure. In this paper we describe the original SDSS spectrograph design and the upgrades implemented for BOSS, and document the predicted and measured performances

THE MULTI-OBJECT, FIBER-FED SPECTROGRAPHS FOR THE SLOAN DIGITAL SKY SURVEY AND THE BARYON OSCILLATION SPECTROSCOPIC SURVEY

Energy Technology Data Exchange (ETDEWEB)

Smee, Stephen A.; Barkhouser, Robert H. [Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States); Gunn, James E.; Carr, Michael A.; Lupton, Robert H.; Loomis, Craig [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States); Uomoto, Alan [Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Roe, Natalie; Schlegel, David [Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Rockosi, Constance M. [UC Observatories and Department of Astronomy and Astrophysics, University of California, Santa Cruz, 375 Interdisciplinary Sciences Building (ISB) Santa Cruz, CA 95064 (United States); Leger, French; Owen, Russell; Anderson, Lauren [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 09195 (United States); Dawson, Kyle S.; Olmstead, Matthew D. [Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112 (United States); Brinkmann, Jon; Long, Dan [Apache Point Observatory, Sunspot, NM 88349 (United States); Honscheid, Klaus [Department of Physics and Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210 (United States); Harding, Paul [Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106 (United States); Annis, James, E-mail: smee@pha.jhu.edu [Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States); and others

2013-08-01

We present the design and performance of the multi-object fiber spectrographs for the Sloan Digital Sky Survey (SDSS) and their upgrade for the Baryon Oscillation Spectroscopic Survey (BOSS). Originally commissioned in Fall 1999 on the 2.5 m aperture Sloan Telescope at Apache Point Observatory, the spectrographs produced more than 1.5 million spectra for the SDSS and SDSS-II surveys, enabling a wide variety of Galactic and extra-galactic science including the first observation of baryon acoustic oscillations in 2005. The spectrographs were upgraded in 2009 and are currently in use for BOSS, the flagship survey of the third-generation SDSS-III project. BOSS will measure redshifts of 1.35 million massive galaxies to redshift 0.7 and Ly{alpha} absorption of 160,000 high redshift quasars over 10,000 deg{sup 2} of sky, making percent level measurements of the absolute cosmic distance scale of the universe and placing tight constraints on the equation of state of dark energy. The twin multi-object fiber spectrographs utilize a simple optical layout with reflective collimators, gratings, all-refractive cameras, and state-of-the-art CCD detectors to produce hundreds of spectra simultaneously in two channels over a bandpass covering the near-ultraviolet to the near-infrared, with a resolving power R = {lambda}/FWHM {approx} 2000. Building on proven heritage, the spectrographs were upgraded for BOSS with volume-phase holographic gratings and modern CCD detectors, improving the peak throughput by nearly a factor of two, extending the bandpass to cover 360 nm < {lambda} < 1000 nm, and increasing the number of fibers from 640 to 1000 per exposure. In this paper we describe the original SDSS spectrograph design and the upgrades implemented for BOSS, and document the predicted and measured performances.

THE MULTI-OBJECT, FIBER-FED SPECTROGRAPHS FOR THE SLOAN DIGITAL SKY SURVEY AND THE BARYON OSCILLATION SPECTROSCOPIC SURVEY

Energy Technology Data Exchange (ETDEWEB)

Smee, Stephen A.; Gunn, James E.; Uomoto, Alan; Roe, Natalie; Schlegel, David; Rockosi, Constance M.; Carr, Michael A.; Leger, French; Dawson, Kyle S.; Olmstead, Matthew D.; Brinkmann, Jon; Owen, Russell; Barkhouser, Robert H.; Honscheid, Klaus; Harding, Paul; Long, Dan; Lupton, Robert H.; Loomis, Craig; Anderson, Lauren; Annis, James; Bernardi, Mariangela; Bhardwaj, Vaishali; Bizyaev, Dmitry; Bolton, Adam S.; Brewington, Howard; Briggs, John W.; Burles, Scott; Burns, James G.; Castander, Francisco Javier; Connolly, Andrew; Davenport, James R. A.; Ebelke, Garrett; Epps, Harland; Feldman, Paul D.; Friedman, Scott D.; Frieman, Joshua; Heckman, Timothy; Hull, Charles L.; Knapp, Gillian R.; Lawrence, David M.; Loveday, Jon; Mannery, Edward J.; Malanushenko, Elena; Malanushenko, Viktor; Merrelli, Aronne James; Muna, Demitri; Newman, Peter R.; Nichol, Robert C.; Oravetz, Daniel; Pan, Kaike; Pope, Adrian C.; Ricketts, Paul G.; Shelden, Alaina; Sandford, Dale; Siegmund, Walter; Simmons, Audrey; Smith, D. Shane; Snedden, Stephanie; Schneider, Donald P.; SubbaRao, Mark; Tremonti, Christy; Waddell, Patrick; York, Donald G.

2013-07-12

We present the design and performance of the multi-object fiber spectrographs for the Sloan Digital Sky Survey (SDSS) and their upgrade for the Baryon Oscillation Spectroscopic Survey (BOSS). Originally commissioned in Fall 1999 on the 2.5-m aperture Sloan Telescope at Apache Point Observatory, the spectrographs produced more than 1.5 million spectra for the SDSS and SDSS-II surveys, enabling a wide variety of Galactic and extra-galactic science including the first observation of baryon acoustic oscillations in 2005. The spectrographs were upgraded in 2009 and are currently in use for BOSS, the flagship survey of the third-generation SDSS-III project. BOSS will measure redshifts of 1.35 million massive galaxies to redshift 0.7 and Lyman-alpha absorption of 160,000 high redshift quasars over 10,000 square degrees of sky, making percent level measurements of the absolute cosmic distance scale of the Universe and placing tight constraints on the equation of state of dark energy. The twin multi-object fiber spectrographs utilize a simple optical layout with reflective collimators, gratings, all-refractive cameras, and state-of-the-art CCD detectors to produce hundreds of spectra simultaneously in two channels over a bandpass covering the near ultraviolet to the near infrared, with a resolving power R = \\lambda/FWHM ~ 2000. Building on proven heritage, the spectrographs were upgraded for BOSS with volume-phase holographic gratings and modern CCD detectors, improving the peak throughput by nearly a factor of two, extending the bandpass to cover 360 < \\lambda < 1000 nm, and increasing the number of fibers from 640 to 1000 per exposure. In this paper we describe the original SDSS spectrograph design and the upgrades implemented for BOSS, and document the predicted and measured performances.

Spectrographic determination of chlorine and fluorine

International Nuclear Information System (INIS)

Contamin, G.

1965-04-01

Experimental conditions have been investigated in order to obtain the highest sensitivity in spectrographic determination of chlorine and fluorine using the Fassel method of excitation in an inert atmosphere. The influence of the nature of the atmosphere, of the discharge conditions and of the matrix material has been investigated. The following results have been established: 1. chlorine determination is definitely possible: a working curve has been drawn between 10 μg and 100 μg, the detection limit being around 5 μg; 2. fluorine determination is not satisfactory: the detection limit is still of the order of 80 μg. The best operating conditions have been defined for both elements. (author) [fr

Banco de ensayos para materiales piezoeléctricos en aplicaciones viales

Directory of Open Access Journals (Sweden)

de Frutos, J.

2011-04-01

Full Text Available The test bench system described in this paper performs experiments on piezoelectric materials used in road traffic applications, covering a range between 14 and 170 km/h, which is considered enough for testing under standard traffic conditions. A software has been developed to control the three phase induction motor driver and to acquire all the measurement data of the piezoelectric materials. The mass over each system’s axis can be selected, with a limit of 60 kg over each wheel. The test bench is used to simulate the real behaviour of buried piezoelectric cables in road traffic applications for both light and heavy vehicles. This new test bed system is a powerful research tool and can be applied to determine the optimal installation and configuration of the piezoelectric cable sensors and opens a new field of research: the study of energy harvesting techniques based on piezoelectric materials.

En este trabajo se define y propone un banco de ensayos que permite testar materiales piezoeléctricos para aplicaciones viales en sus diferentes configuraciones en un rango de velocidad entre los 14 y los 170 km/h, lo que cubre sobradamente las condiciones de tráfico real. Tanto el control del variador de velocidad del motor trifásico que realiza el accionamiento del banco, como la recogida de resultados de medida en las pruebas de excitación y de fatiga de los compuestos piezoeléctricos, se realiza de forma automatizada mediante código informatico. El peso que soporta cada eje del banco es configurable, permitiendo reproducir las señales obtenidas en aplicaciones donde los materiales piezoeléctricos actúan de sensores enterrados en la calzada para vehículos tanto pesados como ligeros. Gracias a esta nueva herramienta se facilita la investigación con materiales de este tipo en aplicaciones viales optimizando tanto el tipo como la disposición e instalación de los mismos, además de abrir el camino a la novedosa investigación sobre

Quantitative imaging through a spectrograph : 2. stoichiometry mapping by Raman scattering

NARCIS (Netherlands)

Tolboom, R.A.L.; Dam, N.J.; Meulen, ter J.J.

2004-01-01

The Bayesian deconvolution algorithm described in a preceding paper [Appl. Opt. 43, 5669–5681 (2004)] is applied to measurement of the two-dimensional stoichiometry field in a combustible methane-air mixture by Raman imaging through a spectrograph. Stoichiometry (fuel equivalence ratio) is derived

Development of micro-mirror slicer integral field unit for space-borne solar spectrographs

Science.gov (United States)

Suematsu, Yoshinori; Saito, Kosuke; Koyama, Masatsugu; Enokida, Yukiya; Okura, Yukinobu; Nakayasu, Tomoyasu; Sukegawa, Takashi

2017-12-01

We present an innovative optical design for image slicer integral field unit (IFU) and a manufacturing method that overcomes optical limitations of metallic mirrors. Our IFU consists of a micro-mirror slicer of 45 arrayed, highly narrow, flat metallic mirrors and a pseudo-pupil-mirror array of off-axis conic aspheres forming three pseudo slits of re-arranged slicer images. A prototype IFU demonstrates that the final optical quality is sufficiently high for a visible light spectrograph. Each slicer micro-mirror is 1.58 mm long and 30 μm wide with surface roughness ≤1 nm rms, and edge sharpness ≤ 0.1 μm, etc. This IFU is small size and can be implemented in a multi-slit spectrograph without any moving mechanism and fore optics, in which one slit is real and the others are pseudo slits from the IFU. The IFU mirrors were deposited by a space-qualified, protected silver coating for high reflectivity in visible and near IR wavelength regions. These properties are well suitable for space-borne spectrograph such as the future Japanese solar space mission SOLAR-C. We present the optical design, performance of prototype IFU, and space qualification tests of the silver coating.

Aplicaciones del Just-In-Time en la Argentina

OpenAIRE

Enrique Yacuzzi; Carolina Fajntich; María Pía Romeo

2013-01-01

Este trabajo presenta el concepto de JIT (Just-In-Time, o justo a tiempo) y ofrece aplicaciones en la Argentina. En la Parte I, pone el JIT en el contexto de la gestión japonesa (management japonés): destaca las características de esta gestión, y resume su evolución a lo largo de las últimas décadas. Hace hincapié en la gestión de la producción y analiza los desafíos, críticas y las teorías de la convergencia con los sistemas occidentales que se han examinado a lo largo de los últimos 20 años...

Evaluation of a compact spectrograph for in-situ and stand-off Laser-Induced Breakdown Spectroscopy analyses of geological samples on Mars missions

International Nuclear Information System (INIS)

Salle, Beatrice; Cremers, David A.; Maurice, Sylvestre; Wiens, Roger C.; Fichet, Pascal

2005-01-01

Laser-induced Breakdown Spectroscopy (LIBS) is actively under development for future use on surface probes to Mars. The analytical method can be deployed for in-situ and/or stand-off analysis with the latter embodiment providing the greatest advantages compared to previous and current elemental analysis methods used for planetary surface analysis. For this application, LIBS must be thoroughly investigated in terms of analytical capabilities and flight-rated instruments must be developed. Because of the low pressure of the predominantly CO 2 atmosphere on Mars, studies are needed to understand analytical requirements and to determine performance under these conditions. Stand-off analysis demands the most stringent requirements on instrumentation. Therefore, it must be determined if the high performance components that are normally used in a typical LIBS laboratory setup, which are generally not optimized for small size and weight, are essential to obtain the maximum scientific return from a mission. A key component of a LIBS apparatus is the detection system consisting of a spectrograph and a detector. Here we present an evaluation of one design of a compact spectrograph (Ocean Optics HR2000) for in-situ and stand-off LIBS analyses of geological samples under Mars atmospheric conditions

Study of airborne particles by emission spectrographic method

Energy Technology Data Exchange (ETDEWEB)

Chao, C N; Lee, S L; Tsai, H T; Wu, S C

1975-03-01

A rapid spectrographic method was developed to analyze cadmium, lead, nickel, zinc, tin, titanium, and vanadium collected in glass fiber air filters. A direct excitation method is used for volatile elements, while graphite powder is added for determining involatile elements, such as Ti and V in a dc arc source. Limits of detection for analyzed elements are between 0.01-0.1 micrograms. This simple and sensitive method was used to analyze samples from 15 air sampling stations in different areas of Taiwan.

Performance testing of an off-plane reflection grating and silicon pore optic spectrograph at PANTER

Science.gov (United States)

Marlowe, Hannah; McEntaffer, Randall L.; Allured, Ryan; DeRoo, Casey T.; Donovan, Benjamin D.; Miles, Drew M.; Tutt, James H.; Burwitz, Vadim; Menz, Benedikt; Hartner, Gisela D.; Smith, Randall K.; Cheimets, Peter; Hertz, Edward; Bookbinder, Jay A.; Günther, Ramses; Yanson, Alex; Vacanti, Giuseppe; Ackermann, Marcelo

2015-10-01

An x-ray spectrograph consisting of aligned, radially ruled off-plane reflection gratings and silicon pore optics (SPO) was tested at the Max Planck Institute for Extraterrestrial Physics PANTER x-ray test facility. SPO is a test module for the proposed Arcus mission, which will also feature aligned off-plane reflection gratings. This test is the first time two off-plane gratings were actively aligned to each other and with an SPO to produce an overlapped spectrum. We report the performance of the complete spectrograph utilizing the aligned gratings module and plans for future development.

Spectrographic Determination of Trace Constituents in Rare Earths; Determinacion espectrografica de impurezas en tierras raras

Energy Technology Data Exchange (ETDEWEB)

Capdevila, C; Alvarez, F

1962-07-01

A spectrographic method was developed for the determination of 18 trace elements in lanthanum, cerium, praseodimium, neodimium and samarium compounds. The concentrations of the impurities cover the range of 0,5 to 500 ppm. Most of these impurities are determined by the carrier distillation method. Several more refractory elements have been determined by total burning of the sample with a direct current arc or by the conduction briquet excitation technique with a high voltage condensed spark. The work has been carried out with a Hilger Automatic Large Quartz Spectrograph. (Author) 5 refs.

Sensitivity Calibration of Far-Ultraviolet Imaging Spectrograph

Directory of Open Access Journals (Sweden)

I. -J. Kim

2004-12-01

Full Text Available We describe the in-flight sensitivity calibration of the Far ultraviolet Imaging Spectrograph (FIMS, also known as SPEAR onboard the first Korean science satellite, STSAT-1, which was launched in September 2003. The sensitivity calibration is based on a comparison of the FIMS observations of the hot white dwarf G191B2B, and two O-type stars Alpha-Cam, HD93521 with the HUT (Hopkins Ultraviolet Telescope observations. The FIMS observations for the calibration targets have been conducted from November 2003 through May 2004. The effective areas calculated from the targets are compared with each other.

MuSICa: the Multi-Slit Image Slicer for the est Spectrograph

Science.gov (United States)

Calcines, A.; López, R. L.; Collados, M.

2013-09-01

Integral field spectroscopy (IFS) is a technique that allows one to obtain the spectra of all the points of a bidimensional field of view simultaneously. It is being applied to the new generation of the largest night-time telescopes but it is also an innovative technique for solar physics. This paper presents the design of a new image slicer, MuSICa (Multi-Slit Image slicer based on collimator-Camera), for the integral field spectrograph of the 4-m aperture European Solar Telescope (EST). MuSICa is a multi-slit image slicer that decomposes an 80 arcsec2 field of view into slices of 50 μm and reorganizes it into eight slits of 0.05 arcsec width × 200 arcsec length. It is a telecentric system with an optical quality at diffraction limit compatible with the two modes of operation of the spectrograph: spectroscopic and spectro-polarimetric. This paper shows the requirements, technical characteristics and layout of MuSICa, as well as other studied design options.

Extracción y aplicaciones alimentarias de membranas de cáscaras de huevo

OpenAIRE

García Campos, Tania

2015-01-01

Caracterización físico-química de la membrana de la cáscara de huevo, seguida del estudio y desarollo de posibles aplicaciones de la membrana en diversos campos, entre los que destaca la formación de geles y la retención de cobre y proteínas.

E parallel B energy-mass spectrograph for measurement of ions and neutral atoms

International Nuclear Information System (INIS)

Funsten, H.O.; McComas, D.J.; Scime, E.E.

1997-01-01

Real-time measurement of plasma composition and energy is an important diagnostic in fusion experiments. The Thomson parabola spectrograph described here utilizes an electric field parallel to a magnetic field (E parallel B) and a two-dimensional imaging detector to uniquely identify the energy-per-charge and mass-per-charge distributions of plasma ions. An ultrathin foil can be inserted in front of the E parallel B filter to convert neutral atoms to ions, which are subsequently analyzed using the E parallel B filter. Since helium exiting an ultrathin foil does not form a negative ion and hydrogen isotopes do, this spectrograph allows unique identification of tritium ions and neutrals even in the presence of a large background of 3 He. copyright 1997 American Institute of Physics

Spectrographic determination of impurities in ammonium bifluoride. III. Study of the processes of vaporization, transport and excitation of the elements Al, B, Cu and Cr

International Nuclear Information System (INIS)

Alduan, F. A.; Roca, M.; Capdevila, C.

1979-01-01

The influences of the processes of vaporization, transport and excitation on the shape of the volatilization-excitation curves and on the values of the spectral-line intensities have been investigated in a method for the spectrographic determination of Al, B, Cu and Cr In ammonium bifluoride samples by direct current are excitation in Scribner type electrodes, with addition of different matrices (graphite, 63203, GeO 2 , MgO and Zn0). The reaction products in the electrode cavity have been identified by X-ray powder diffraction analysis and the percentages of vaporized and diffused element evaluated through analysis by total-burning spectrographic methods. In addition, the values of both the number of particles entering the discharge column and the transport efficiencies have been calculated. Thus, the origin of most observed differences has been explained. (Author) 11 refs

Proposal for the ion optics and for the kinematical fitting at the magnetic spectrograph BIG KARL

International Nuclear Information System (INIS)

Hinterberger, F.

1986-01-01

For the magnetic spectrograph BIG KARL the installation of an additional quadrupole lens is purposed. From this the possibility of a telescopic ion optic results. For future experiments a standard focusing with a spatial dispersion of 6.6 m and vanishing angular dispersion is proposed. The D/M ratio (dispersion/magnification) extends to 14.0 m, the maximal spatial angle lies at 3 msr. The energy range extends at a focal plane length of 0.66 m to 20%. For the kinematical fitting of the spectrograph the focal plane is shifted. This shift can be simply and rapidly realized for different K values by means of a software correction, if generally two spatial spectra in the focal plane are taken up. By this additionally for each event the actual scattering angle can be determined with relatively good resolution. The dispersion fit is completely decoupled from the kinematical fitting of the magnetic spectrograph. (orig.) [de

El papel de las variables sociodemográficas en el uso de las aplicaciones basadas en Internet por los Mayores

Directory of Open Access Journals (Sweden)

Begoña Peral Peral

2013-06-01

Full Text Available La población mundial está envejeciendo progresivamente. Se prevé que en 2050 el número de personas mayores de 60 años alcance los dos mil millones en el mundo. El empleo de las Tecnologías de la Información y Comunicación (TIC puede suponer para la población de mayor edad un impacto significativo en su calidad de vida, contribuyendo a conseguir mayores activos, disminuyendo la marginalización y el aislamiento social. Aunque existen diferencias importantes en el uso que los Mayores hacen de Internet y sus aplicaciones respecto al resto de la población, hay que considerar que este segmento no constituye un grupo homogéneo. Este trabajo busca comprobar si dentro del grupo de los Mayores existen diferencias en la frecuencia de uso de distintas aplicaciones basadas en Internet, en función de la edad, el sexo, el nivel de estudios alcanzados y la actividad laboral desarrollada en el pasado. Los resultados demuestran que existen diferencias significativas en el empleo de algunas aplicaciones en función de las variables sociodemográficas analizadas.

Análisis de Desarrollo de Software Orientado a Feature - Línea de Producto de Software para Aplicaciones de TVDI

Directory of Open Access Journals (Sweden)

Mirtha Fabiana Miranda

2015-08-01

Full Text Available El Desarrollo de Software Orientado a Features (FOSD consiste en la construcción de sistemas a partir de un conjunto de características, cada feature o característica es una unidad funcional que satisface un requisito de software. Las fases son análisis del dominio, diseño e implementación del dominio, configuración y generación del producto de software, obteniendo así una Línea de Productos de Software (SPL. El presente trabajo realiza una comparación de herramientas para su implementación y, se analiza un conjunto de aplicaciones que modelan features. Resultando un espacio de estudio abierto para modelar aplicaciones para la Televisión Digital Interactiva (TVDi. Además se han encontrado diversos métodos, artefactos y patrones de diseño para el modelado de una aplicación de TVDi en particular, reflejando un estudio para el modelado de variabilidad. El objetivo principal es estudiar SPL / FOSD, empleando los Patrones de Diseño de Interacción (PDI para el dominio de las aplicaciones de TVDi.

Observations of the radial velocity of the Sun as measured with the novel SONG spectrograph

DEFF Research Database (Denmark)

Pallé, P. L.; Grundahl, F.; Hage, A. Triviño

2013-01-01

Deployment of the prototype node of the SONG project took place in April 2012 at Observatorio del Teide (Canary Islands). Its key instrument (echelle spectrograph) was installed and operational a few weeks later while its 1 m feeding telescope suffered a considerable delay to meet the required...... specifications. Using a fibre-feed, solar light could be fed to the spectrograph and we carried out a 1-week observing campaign in June 2012 to evaluate its performance for measuring precision radial velocities. In this work we present the first results of this campaign by comparing the sensitivity of the SONG...

Spectrographic determination of niobium in uranium - niobium alloys

International Nuclear Information System (INIS)

Charbel, M.Y.; Lordello, A.R.

1984-01-01

A method for the spectrographic determination of niobium in uranium-niobium alloys in the concentration range 1-10% has been developed. The metallic sample is converted to oxide by calcination in a muffle furnace at 800 0 C for two hours. The standards are prepared synthetically by dry-mixing. One part of the sample or standard is added to nineteen parts of graphite powder and the mixture is excited in a DC arc. Hafnium has been used as internal standard. The precision of the method is + - 4.8%. (Author) [pt

Spectrographic determination of impurities in ammonium bifluoride. IV.Study of the processes of vaporization, transport and excitation of the elements Fe, Mn, Mo, Ni, Pb and Si

International Nuclear Information System (INIS)

Alduan, F.A.; Capdevila, C.; Roca, M.

1981-01-01

The influences of the processes of vaporization, transport and excitation on the shape of the volatilization-excitation curves and on the values of the spectra-line intensities have been investigated in a method for the spectrographic determination of Fe, Mn, Mo, Ni, Pb and Si in ammonium bifluoride samples by direct current arc Ga 2 O 3 , GeO 2 , MgO and ZnO. The reaction products in the electrode cavity have been identified by X-ray powder diffraction analysis and the porcentages of vaporized and diffused element evaluated through analysis by total-burning spectrographic methods. In addition, the values of both the number of particles entering the discharge column and the transport efficiencies have been calculated. Thus, the origin of most observed differences has been explained. (author)

Using an integral-field unit spectrograph to study radical species in cometary coma

Science.gov (United States)

Lewis, Benjamin; Pierce, Donna M.; Vaughan, Charles M.; Cochran, Anita

2015-01-01

We have observed several comets using an integral-field unit spectrograph (the George and Cynthia Mitchell Spectrograph) on the 2.7m Harlan J. Smith telescope at McDonald Observatory. Full-coma spectroscopic images were obtained for various radical species (C2, C3, CN, NH2). Various coma enhancements were used to identify and characterize coma morphological features. The azimuthal average profiles and the Haser model were used to determine production rates and possible parent molecules. Here, we present the work completed to date, and we compare our results to other comet taxonomic surveys. This work was funded by the National Science Foundation Graduate K-12 (GK-12) STEM Fellows program (Award No. DGE-0947419), NASA's Planetary Atmospheres program (Award No. NNX14AH18G), and the Fund for Astrophysical Research, Inc.

OBSERVATION AND ANALYSIS OF BALLISTIC DOWNFLOWS IN AN M-CLASS FLARE WITH THE INTERFACE REGION IMAGING SPECTROGRAPH

Energy Technology Data Exchange (ETDEWEB)

Brannon, Sean R. [Department of Physics, Montana State University, Bozeman, MT 59717 (United States)

2016-12-10

Despite significant advances in instrumentation, there remain no studies that analyze observations of on-disk flare loop plasma flows covering the entire evolution from chromospheric evaporation, through plasma cooling, to draining downflows. We present results from an imaging and spectroscopic observation from the Interface Region Imaging Spectrograph ( IRIS ) of the SOL2015–03–12T11:50:00 M-class flare, at high spatial resolution and time cadence. Our analysis of this event reveals initial plasma evaporation at flare temperatures indicated by 100–200 km s{sup −1} blueshifts in the Fe xxi line. We subsequently observe plasma cooling into chromospheric lines (Si iv and O iv) with ∼11 minute delay, followed by loop draining at ∼40 km s{sup −1} as indicated by a “C”-shaped redshift structure and significant (∼60 km s{sup −1}) non-thermal broadening. We use density-sensitive lines to calculate a plasma density for the flare loops, and estimate a theoretical cooling time approximately equal to the observed delay. Finally, we use a simple elliptical free-fall draining model to construct synthetic spectra, and perform what we believe to be the first direct comparison of such synthetic spectra to observations of draining downflows in flare loops.

A CCD fitted to the UV Prime spectrograph: Performance

International Nuclear Information System (INIS)

Boulade, O.

1986-10-01

A CCD camera was fitted to the 3.6 m French-Canadian telescope in Hawai. Performance of the system and observations of elliptic galaxies (stellar content and galactic evolution in a cluster) and quasars (absorption lines in spectra) are reported. In spite of its resolution being only average, the extremely rapid optics of the UV spectrograph gives good signal to noise ratios enabling redshifts and velocity scatter to be calculated with an accuracy better than 30 km/sec [fr

Recording {gamma} spectrometer with elimination of compton background; Spectrographe {gamma} enregistreur avec elimination du bruit de fond compton

Energy Technology Data Exchange (ETDEWEB)

Julliot, C [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

1960-07-01

This instrument, derived from the recording {gamma} spectrograph, gives better definition of photoelectric peaks by elimination of pulses caused by {gamma} photons incompletely absorbed in the scintillator (Compton effect). This system uses an original method devised by Peirson: the spectrum, devoid of photoelectric peak, supplied by a detector equipped with an anthracene scintillator, is cut off from the spectrum provided by a conventional detector equipped with a Nal (T1) scintillator. The regulation of the mechanical system, detector support and source allows the detection yields to be adjusted. The electronic system is identical in presentation with that of the recording spectrograph. (author) [French] Cet appareil derive du spectrographe {gamma} enregistreur permet d'obtenir une meilleure definition des pics photoelectriques, par elimination des impulsions provenant des photons {gamma} incompletement absorbes dans le scintillateur (effet Compton). Cet ensemble met en oeuvre une methode originale due a Peirson: le spectre, depourvu de pic photoelectrique, fourni par un detecteur, equipe avec un scintillateur d'anthracene, est retranche du spectre donne par un detecteur classique, equipe avec un scintillateur de NaI (T1). Le reglage de l'ensemble mecanique, support des detecteurs et de la source, permet d'ajuster les rendements de detection. L'ensemble electronique se presente sous un aspect identique a celui du spectrographe enregistreur. (auteur)

Caracterización del proceso y herramientas metodológicas de la ingeniería de requerimientos para aplicaciones de sistemas de información geográfica

Directory of Open Access Journals (Sweden)

Luis Fernando Medina Cardonal

2007-01-01

Full Text Available Este artículo describe el proceso de la ingeniería de requerimientos y las herramientas metodológicas usadas en aplicaciones de sistemas de información geográfica (SIG ante la ausencia de una alternativa integral y consistente específica para este dominio. Para ello, por un lado, se introduce la problemática de la ingeniería de requerimientos en aplicaciones SIG, se exhiben los tipos de requerimientos, actores involucrados y aspectos comunicativos relevantes en el proceso de requerimientos y se clasifican las metodologías existentes en lenguajes de modelamiento y especificación. Adicionalmente, se presentan los estándares geomáticos como un elemento transversal a tener en cuenta en las aplicaciones SIG.

Los jóvenes como usuarios de aplicaciones de marca en dispositivos móviles

Directory of Open Access Journals (Sweden)

Francisco Javier Ruiz del Olmo

2014-07-01

Full Text Available El presente trabajo analiza el papel de los jóvenes consumidores en el contexto de los nuevos procesos comunicativos que surgen de tecnologías emergentes: el uso de las aplicaciones de marca en los dispositivos móviles. Éstos incorporan funcionalidades sociales y comunicativas cada vez más complejas y, entre ellas, las aplicaciones para teléfonos inteligentes que vinculan publicidad comercial y pagos forman un campo novedoso pero de interés prioritario para distintos actores comunicativos, como son las marcas comerciales, los servicios bancarios y las propias compañías tecnológicas. En ese contexto la presente investigación describe y codifica cualitativamente cómo los usuarios entienden, perciben y utilizan, como prosumidores, las aplicaciones de marca corporativa y los pagos. Para ello se aplican técnicas de investigación en cuatro grupos focales, de edades comprendidas entre los 18 y 24 años, compuestos por jóvenes universitarios españoles estudiantes en Comunicación, como usuarios que muestran una predisposición y una adopción temprana de estas prácticas. Las respuestas de las reuniones del grupo de discusión permitieron una clasificación de las prácticas comunicativas. En conclusión, se constata una alta predisposición de estos consumidores activos por interactuar con contenidos comerciales, estableciendo redes sociales bajo el amparo de una cultura e imagen de marca, como forma de cohesión grupal. Otros usos se relacionan con el entretenimiento y la información, al tiempo que aún se muestran reticentes al pago de productos o servicios mediante el dispositivo móvil.

Diseño de planos indoor para aplicaciones móviles

OpenAIRE

Romagnoli, Nicolás

2013-01-01

Investigando el contexto de las aplicaciones de navegación indoor, encontramos que uno de los problemas en este dominio, es la generación de planos navegables. Este trabajo busca desarrollar una herramienta que permita la creación de planos de interiores, como así también la definición de marcadores posicionados espacialmente que permitan posteriormente brindar servicios de navegación para recorrerlo, a través de la definición de “caminos” entre el usuario y el destino seleccionado. El objeti...

Aplicaciones de la inteligencia artificial en la Medicina: perspectivas y problemas

OpenAIRE

Expósito Gallardo, María del Carmen; Ávila Ávila, Rafael

2008-01-01

Los avances experimentados en el campo de la informática médica en Cuba comprenden la investigación, la docencia, la asistencia secundaria y primaria; así como la gerencia de las instituciones de salud. En este campo, las aplicaciones pertenecientes a la denominada área de la inteligencia artificial despiertan un gran interés, debido a sus posibilidades para involucrarse en situaciones donde se requiere un gran acervo de conocimientos médicos, el veloz procesamiento de los datos y la toma efe...

Aplicaciones bibliotecológicas para el acceso abierto a la información científica en el entorno digital

Directory of Open Access Journals (Sweden)

Eder Ávila Barrientos

2016-01-01

Full Text Available Se presentan las aplicaciones bibliotecológicas actuales para el libre acceso a la información científica en el entorno digital. Mediante el análisis descriptivo, se presentan algunas de las tendencias bibliotecológicas actuales para el libre acceso a la información científica y académica en la web. Se ha identificado que las aplicaciones impactan en las siguientes áreas de la Bibliotecología y los Estudios de la Información: tecnologías de la información; sistemas y servicios bibliotecarios y de información; búsqueda y recuperación de información; acceso a la información. Las actividades desarrolladas en cada área, tienen el objetivo de proporcionar a la persona usuaria de las bibliotecas el acceso a la información sin ningún tipo de restricción; no obstante, nuevos fenómenos informativos han surgido mediante la aplicación de dichas tendencias. De esta manera, el presente artículo tiene como objetivo analizar las aplicaciones bibliotecológicas actuales, para el libre acceso a la información científica a través de la web.

Fortalecimiento en la seguridad de web services para aplicaciones críticas

OpenAIRE

Casanovas, Eduardo; Boiero, Fernando; Tapia, Carlos

2015-01-01

Reconociendo a las propiedades de la Seguridad de la Información (confidencialidad, integridad y disponibilidad) como elementos esenciales de cualquier transferencia de datos, haciendo foco en el conjunto de protocolos y estándares utilizados para intercambiar datos entre aplicaciones web, es decir, Web Services, para el presente trabajo definimos el objetivo general de asegurar dichas comunicaciones, teniendo en consideración que la información intercambiada es igual o más crítica y confiden...

A UV prime focus spectrograph for the CFHT

International Nuclear Information System (INIS)

Boulade, O.; Vigroux, L.

1986-03-01

The UV prime spectrograph at the Canada-France-Hawaii Telescope is the first instrument to be designed with an aspherized diffraction grating. This technique leads to all reflective Schmidt designs with a very small amount of optical surface on fast aperture ratio. A thin backside illuminated RCA CCD is now used as the detector. Since the detector is at the focus of an f/1 mounting, within the optical path, a minicryostat (5 cm x 5 cm x 3 cm) was designed to minimize the central obscuration. This paper describes this new instrument and its performances

Performance testing of a novel off-plane reflection grating and silicon pore optic spectrograph at PANTER

Science.gov (United States)

Marlowe, Hannah; McEntaffer, Randall L.; Allured, Ryan; DeRoo, Casey; Miles, Drew M.; Donovan, Benjamin D.; Tutt, James H.; Burwitz, Vadim; Menz, Benedikt; Hartner, Gisela D.; Smith, Randall K.; Günther, Ramses; Yanson, Alex; Vacanti, Giuseppe; Ackermann, Marcelo

2015-05-01

An X-ray spectrograph consisting of aligned, radially ruled off-plane reflection gratings and silicon pore optics (SPO) was tested at the Max Planck Institute for extraterrestrial Physics PANTER X-ray test facility. The SPO is a test module for the proposed Arcus mission, which will also feature aligned off-plane reflection gratings. This test is the first time two off-plane gratings were actively aligned to each other and with a SPO to produce an overlapped spectrum. We report the performance of the complete spectrograph utilizing the aligned gratings module and plans for future development.

Rocket studies of solar corona and transition region. [X-Ray spectrometer/spectrograph telescope

Science.gov (United States)

Acton, L. W.; Bruner, E. C., Jr.; Brown, W. A.; Nobles, R. A.

1979-01-01

The XSST (X-Ray Spectrometer/Spectrograph Telescope) rocket payload launched by a Nike Boosted Black Brant was designed to provide high spectral resolution coronal soft X-ray line information on a spectrographic plate, as well as time resolved photo-electric records of pre-selected lines and spectral regions. This spectral data is obtained from a 1 x 10 arc second solar region defined by the paraboloidal telescope of the XSST. The transition region camera provided full disc images in selected spectral intervals originating in lower temperature zones than the emitting regions accessible to the XSST. A H-alpha camera system allowed referencing the measurements to the chromospheric temperatures and altitudes. Payload flight and recovery information is provided along with X-ray photoelectric and UV flight data, transition camera results and a summary of the anomalies encountered. Instrument mechanical stability and spectrometer pointing direction are also examined.

Far-ultraviolet Spectroscopy of Recent Comets with the Cosmic Origins Spectrograph on the Hubble Space Telescope

Science.gov (United States)

Feldman, Paul D.; Weaver, Harold A.; A’Hearn, Michael F.; Combi, Michael R.; Dello Russo, Neil

2018-05-01

Since its launch in 1990, the Hubble Space Telescope (HST) has served as a platform with unique capabilities for remote observations of comets in the far-ultraviolet region of the spectrum. Successive generations of imagers and spectrographs have seen large advances in sensitivity and spectral resolution enabling observations of the diverse properties of a representative number of comets during the past 25 years. To date, four comets have been observed in the far-ultraviolet by the Cosmic Origins Spectrograph (COS), the last spectrograph to be installed in HST, in 2009: 103P/Hartley 2, C/2009 P1 (Garradd), C/2012 S1 (ISON), and C/2014 Q2 (Lovejoy). COS has unprecedented sensitivity, but limited spatial information in its 2.″5 diameter circular aperture, and our objective was to determine the CO production rates from measurements of the CO Fourth Positive system in the spectral range of 1400–1700 Å. In the two brightest comets, 19 bands of this system were clearly identified. The water production rates were derived from nearly concurrent observations of the OH (0,0) band at 3085 Å by the Space Telescope Imaging Spectrograph. The derived CO/{{{H}}}2{{O}} production rate ratio ranged from ∼0.3% for Hartley 2 to ∼22% for Garradd. In addition, strong partially resolved emission features due to multiplets of S I, centered at 1429 Å and 1479 Å, and of C I at 1561 Å and 1657 Å, were observed in all four comets. Weak emission from several lines of the {{{H}}}2 Lyman band system, excited by solar Lyα and Lyβ pumped fluorescence, were detected in comet Lovejoy.

MOONS: a multi-object optical and near-infrared spectrograph for the VLT

NARCIS (Netherlands)

Cirasuolo, M.; Afonso, J.; Bender, R.; Bonifacio, P.; Evans, C.; Kaper, L.; Oliva, Ernesto; Vanzi, Leonardo; Abreu, Manuel; Atad-Ettedgui, Eli; Babusiaux, Carine; Bauer, Franz E.; Best, Philip; Bezawada, Naidu; Bryson, Ian R.; Cabral, Alexandre; Caputi, Karina; Centrone, Mauro; Chemla, Fanny; Cimatti, Andrea; Cioni, Maria-Rosa; Clementini, Gisella; Coelho, João.; Daddi, Emanuele; Dunlop, James S.; Feltzing, Sofia; Ferguson, Annette; Flores, Hector; Fontana, Adriano; Fynbo, Johan; Garilli, Bianca; Glauser, Adrian M.; Guinouard, Isabelle; Hammer, Jean-François; Hastings, Peter R.; Hess, Hans-Joachim; Ivison, Rob J.; Jagourel, Pascal; Jarvis, Matt; Kauffman, G.; Lawrence, A.; Lee, D.; Li Causi, G.; Lilly, S.; Lorenzetti, D.; Maiolino, R.; Mannucci, F.; McLure, R.; Minniti, D.; Montgomery, D.; Muschielok, B.; Nandra, K.; Navarro, R.; Norberg, P.; Origlia, L.; Padilla, N.; Peacock, J.; Pedicini, F.; Pentericci, L.; Pragt, J.; Puech, M.; Randich, S.; Renzini, A.; Ryde, N.; Rodrigues, M.; Royer, F.; Saglia, R.; Sánchez, A.; Schnetler, H.; Sobral, D.; Speziali, R.; Todd, S.; Tolstoy, E.; Torres, M.; Venema, L.; Vitali, F.; Wegner, M.; Wells, M.; Wild, V.; Wright, G.

MOONS is a new conceptual design for a Multi-Object Optical and Near-infrared Spectrograph for the Very Large Telescope (VLT), selected by ESO for a Phase A study. The baseline design consists of ~1000 fibers deployable over a field of view of ~500 square arcmin, the largest patrol field offered by

Estudio de capacidades y aplicaciones de nuevos estándares web en soluciones empresariales

OpenAIRE

Morales Tua, Joan Manuel

2011-01-01

Castellano: Este proyecto muestra un estudio de la nueva generación de estándares web conocidos como HTML5, con la finalidad de evaluar las posibilidades tecnológicas que estos ofrecen en el desarrollo de aplicaciones web corporativas, además se presenta el desarrollo de una aplicación prototipo.

Volatilization mechanism of certain elements in a method of semiquantitative spectrographic analysis; Mecanismo de volatilizacion de ciertos elementos en un metodo de analisis espectrografico semicuantitativo

Energy Technology Data Exchange (ETDEWEB)

Diaz-Guerra, J P

1972-07-01

The efficiency of the compounds GeO{sub 2}, Li{sub 2}B{sub 4}O{sub 7}, Li{sub 2}CO{sub 3}, SiO{sub 2} and SrCO{sub 3} as spectrochemical buffers, in the development of a semiquantitative spectrographic method of analysis, that can be applied to the determination of 47 elements in different matrices, has been tested. It has been shown that trough the use of Li{sub 2}B{sub 4}O{sub 7} or Geo{sub 2} adequate accuracy is obtained, attaining with the latter the detection of much lower concentrations, specially for the elements Mo. Ti, V and W. In order to account for the different behaviour of these elements their volatilization mechanism has been studied. MoB{sub 2}, TiB{sub 2}, VB{sub 2}.{delta}WB and {epsilon}-WB were found, by x-ray diffraction analysis, to be reaction products in the case of mixtures with Li{sub 2}B{sub 4}O{sub 7}. (Author)

Spectrographic determination of impurities in enriched uranium solutions

International Nuclear Information System (INIS)

Capdevila, C.; Roca, M.

1980-01-01

A spectrographic procedure for the determination of trace amounts of Al, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, K, L i , Hg, Mn, Mo, Na, Nb, Ni, P, Pb, Ru, Sb, Sn, Sr, Ti, V, Zn, and Zr in enriched uranyl nitrate solutions from the reprocessing of spent nuclear fuels is described. After removal of uranium by either TBP or TNOA solvent extraction, the aqueous phase Is analysed by the graphite spark technique. TBP is adequate for all impurities, excepting boron and phosphorus; both of these elements can sat is factory be determined by using TNOA after the addition of mannitol to avoid boron losses. (Author) 4 refs

La evaluación de las aplicaciones de lectura web: un paso más en el proceso de editorialización de la web

OpenAIRE

Noelia Patón Rodríguez; Raquel Gómez-Diaz

2016-01-01

[ES]En el desarrollo de la lectura digital confluyen una serie de factores que pasan entre otras cuestiones por la evolución tecnológica de los dispositivos y el desarrollo de numerosas aplicaciones que facilitan la lectura al tiempo que está provocando cambios en los hábitos de lectura tal y como lo demuestran los diferentes informes. Uno de los desarrollos tecnológicos está relacionado con el diseño de aplicaciones específicas para la lectura en la pantalla del ordenador, son las llamadas a...

A High Resolution Solar Spectrograph for the Berkeley Undergraduate Astronomy Lab

Science.gov (United States)

Strickler, R.; Bresloff, C.; Graham, J.

2005-05-01

The discovery of extra-solar planets has stimulated interest amongst undergraduates. The Doppler method for detecting exoplanets requires extraction of signals at the 1/1000 of a pixel level. To illustrate this technique, we used a newly built spectrometer to extract sub-pixel Doppler shifts in the solar photosphere. We have used this spectrograph to measure the velocity gradient across the sun and hence infer the solar radius. The limb-to-limb Doppler shift is only 1.8 km/s. A spectral resolution > 100,000 would be required to manifest this motion. Achieving such high spectral resolution is unnecessary since even a small telescope can record high SNR (> 100) spectra. Within a few seconds it is possible to discern solar rotational Doppler shifts at resolutions as low as 10,000. We must also understand coordinate transformation to convert the Doppler signal along the observed diameter to the equatorial rotation speed assuming solid body rotation. The spectrograph system includes an 8-inch Schmidt-Cassegrain stationary telescope; a 100-micron diameter multi-mode fiber; aspheric f-number reformatting optics; a collimating lens; a 110 mm, 80 grooves/mm, θ blaze = 64.5 degree replica echelle grating; and an Apogee 1024 x 1024 thermo-electrically cooled CCD. The spectrometer optics are mounted on a 5-ft x 3-ft optical bench. Operating the spectrometer remotely using VNC and a wireless laptop, we pointed the telescope so that the fiber scanned across a diameter of the solar disk while the CCD took repeated exposures. Although we were "guinea pigs," using the spectrograph for the first time in a class, it worked remarkably well. Combining measurement of the solar radius with observation of the rotation period from sunspots, the earth-sun distance can be deduced. In the future, students may measure the eccentricity of earth's orbit by measuring the sun's radial velocity over the course of a year. This work was supported by the NSF through award DUE-0311536.

The infrared imaging spectrograph (IRIS) for TMT: latest science cases and simulations

Science.gov (United States)

Wright, Shelley A.; Walth, Gregory; Do, Tuan; Marshall, Daniel; Larkin, James E.; Moore, Anna M.; Adamkovics, Mate; Andersen, David; Armus, Lee; Barth, Aaron; Cote, Patrick; Cooke, Jeff; Chisholm, Eric M.; Davidge, Timothy; Dunn, Jennifer S.; Dumas, Christophe; Ellerbroek, Brent L.; Ghez, Andrea M.; Hao, Lei; Hayano, Yutaka; Liu, Michael; Lopez-Rodriguez, Enrique; Lu, Jessica R.; Mao, Shude; Marois, Christian; Pandey, Shashi B.; Phillips, Andrew C.; Schoeck, Matthias; Subramaniam, Annapurni; Subramanian, Smitha; Suzuki, Ryuji; Tan, Jonathan C.; Terai, Tsuyoshi; Treu, Tommaso; Simard, Luc; Weiss, Jason L.; Wincentsen, James; Wong, Michael; Zhang, Kai

2016-07-01

The Thirty Meter Telescope (TMT) first light instrument IRIS (Infrared Imaging Spectrograph) will complete its preliminary design phase in 2016. The IRIS instrument design includes a near-infrared (0.85 - 2.4 micron) integral field spectrograph (IFS) and imager that are able to conduct simultaneous diffraction-limited observations behind the advanced adaptive optics system NFIRAOS. The IRIS science cases have continued to be developed and new science studies have been investigated to aid in technical performance and design requirements. In this development phase, the IRIS science team has paid particular attention to the selection of filters, gratings, sensitivities of the entire system, and science cases that will benefit from the parallel mode of the IFS and imaging camera. We present new science cases for IRIS using the latest end-to-end data simulator on the following topics: Solar System bodies, the Galactic center, active galactic nuclei (AGN), and distant gravitationally-lensed galaxies. We then briefly discuss the necessity of an advanced data management system and data reduction pipeline.

Quantitative spectrographic analysis of Li, Na and Ca in uranium base materials, using the carrier distillation technique

International Nuclear Information System (INIS)

Gomes, R.P.; Brito, J. de.

1978-01-01

A spectrographic method for the quantitative determination of Ca, Li and Na in uranium base materials is described. The carrier destillation technique is used and a study is made for the selection of best carrier compounds. In U 3 O 8 matrix, the best results are obtained with 4% In 2 O 3 for the determination of Na and a 15% mixed carrier (3 NaCl + 1 Y 2 O 3 ) for the determination of Ca and Li. The minium determination limit for Ca and Li is 1 ppm while for Na it is 15 ppm. The precision of the method is calculated and the relative standard deviation is found to be 11, 16 and 6,5% for Ca, Li and Na respectively [pt

Aplicaciones actuales de la hipnosis clínica en Latinoamérica: una revisión sistemática de la literatura

Directory of Open Access Journals (Sweden)

Estefania Castañeda

2018-05-01

Full Text Available La hipnosis es un tema controversial y estigmatizado. Las múltiples investigaciones de las últimas décadas han permitido tanto derrumbar mitos, como evidenciar sus mecanismos y aplicaciones, y cómo estos contribuyen al bienestar de las personas. El objetivo de este trabajo es describir las aplicaciones actuales de la hipnosis clínica en el contexto latinoamericano. Con este fin se realizó una revisión sistemática de la literatura en las bases de datos Lilacs y SciELo, empleando los términos “hipnosis”, “hipnosis clínica” y “Latinoamé- rica”. Se incluyeron revisiones de la literatura, artículos originales que tuvieran poblaciones latinoamericanas y presentaciones de caso, publicados entre 1990 y el 2016, escritos en español. La búsqueda inicial arrojó 202 artículos; después de eliminar replicaciones y los que no cumplían criterios de inclusión, 20 artículos fueron incluidos en la revisión. Las aplicaciones de la hipnosis descritas incluyen manejo del dolor, preparación a la cirugía, tabaquismo, problemas gastrointestinales y otras condiciones médicas, aplicaciones en niños y adolescentes, etcétera. Desafortunadamente, los estudios revisados tienen importantes falencias metodológicas, lo que dificulta extraer conclusiones sólidas. A pesar de que la hipnosis es eficaz, práctica, costo-efectiva y aplicada en una gran variedad de problemas clínicos, la evidencia que avala su uso en el contexto latinoamericano es muy limitada. Se requieren investigaciones con una metodología más rigurosa que permitan evidenciar su eficacia en este contexto.

Sistemas operativos móviles: funcionalidades, efectividad y aplicaciones útiles en Colombia

OpenAIRE

2011-01-01

Sistemas operativos móviles más utilizados actualmente con sus funcionalidades, características y descripciones generales, efectividad y análisis realizado a 2 aplicaciones de uso masivo en Colombia. La situación planteada según las investigaciones iniciales, dan a conocer que a pesar de la gran acogida que han tenido el ingreso de los sistemas operativos móviles en Colombia (que ha sido de gran impacto en el mercado mundial) los usuarios no pueden explotar al máximo sus capacidades, debido p...

Spectrographic determination of some rare earths in thorium compounds

International Nuclear Information System (INIS)

Brito, J. de.

1977-01-01

A method for spectrographic determination of Gd, Sm, Dy, Eu, Y, Yb, Tm and Lu in thorium compounds has been developed. Sensibilities of 0.01 μg rare earths/g Th02 were achieved. The rare earth elements were chromatographycally separated in a nitric acid-ether-cellulose system. The solvent mixture was prepared by dissolving 11% of concentrated nitric acid in ether. The method is based upon the sorption of the rare earths on activated cellulose, the elements being eluted together with 0.01 M HNO 3 . The retention of the 152 , 154 Eu used as tracer was 99,4%. The other elements showed recoveries varying from 95 to 99%. A direct carrier destillation procedure for the spectrochemical determination of the mentioned elements was used. Several concentrations of silver chloride were used to study the volatility behavior of the rare earths. 2%AgCl was added to the matrix as definite carrier, being lantanum selected as internal standard. The average coefficient of variation for this method was +- -+ 7%. The method has been appleid to the analysis of rare earths in thorium coumpounds prepared by Thorium Purification Pilot Plant at Atomic Energy Institute, Sao Paulo [pt

A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

Energy Technology Data Exchange (ETDEWEB)

Ito, Y., E-mail: yito@riken.jp [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Schury, P. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); New Mexico State University, Department Chemistry and Biochemistry, Las Cruces, NM 88003 (United States); Wada, M.; Naimi, S. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Smorra, C. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Sonoda, T. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Mita, H. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Takamine, A. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Aoyama Gakuin University, 4-4-25 Shibuya, Shibuya-ku, Tokyo 150-8366 (Japan); Okada, K. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554 (Japan); Ozawa, A. [University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Wollnik, H. [SLOWRI Team, Nishina Accelerator-Based Research Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); New Mexico State University, Department Chemistry and Biochemistry, Las Cruces, NM 88003 (United States)

2013-12-15

Highlights: • Fast cooling time: 2 ms. • High efficiency: ≈27% for {sup 23}Na{sup +} and ≈5.1% for {sup 7}Li{sup +}. • 100% Duty cycle with double trap system. -- Abstract: A radiofrequency quadrupole ion trap system for use with a multi-reflection time-of-flight mass spectrograph (MRTOF) for short-lived nuclei has been developed. The trap system consists of two different parts, an asymmetric taper trap and a flat trap. The ions are cooled to a sufficient small bunch for precise mass measurement with MRTOF in only 2 ms cooling time in the flat trap, then orthogonally ejected to the MRTOF for mass analysis. A trapping efficiency of ≈27% for {sup 23}Na{sup +} and ≈5.1% for {sup 7}Li{sup +} has been achieved.

Two Solar Tornadoes Observed with the Interface Region Imaging Spectrograph

Science.gov (United States)

Yang, Zihao; Tian, Hui; Peter, Hardi; Su, Yang; Samanta, Tanmoy; Zhang, Jingwen; Chen, Yajie

2018-01-01

The barbs or legs of some prominences show an apparent motion of rotation, which are often termed solar tornadoes. It is under debate whether the apparent motion is a real rotating motion, or caused by oscillations or counter-streaming flows. We present analysis results from spectroscopic observations of two tornadoes by the Interface Region Imaging Spectrograph. Each tornado was observed for more than 2.5 hr. Doppler velocities are derived through a single Gaussian fit to the Mg II k 2796 Å and Si IV 1393 Å line profiles. We find coherent and stable redshifts and blueshifts adjacent to each other across the tornado axes, which appears to favor the interpretation of these tornadoes as rotating cool plasmas with temperatures of 104 K–105 K. This interpretation is further supported by simultaneous observations of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory, which reveal periodic motions of dark structures in the tornadoes. Our results demonstrate that spectroscopic observations can provide key information to disentangle different physical processes in solar prominences.

Design of FHiRE: the Fiber High Resolution Echelle Spectrograph

Science.gov (United States)

Pierce, Michael J.; McLane, Jacob N.; Pilachowski, C. A.; Kobulnicky, Henry; Jang-Condell, Hannah

2018-01-01

The enormous success of the Kepler mission in the discovery of transiting exoplanets implies that the majority of stars have planetary systems. NASA's upcomming Transiting Exoplanet Survey Satellite (TESS) is designed to survey the brightest stars over the entire sky, systems that are accessible to spectroscopic follow-up with mid-sized telescopes. We have undertaken the development of a precision radial velocity spectrograph with the goal of providing ground-based suppoert for TESS. The instrument, known as FHiRE (Fiber High Resolution Echelle spectrograph), is being developed in collaboration with Indiana University and will deployed at the 2.3-meter telescope of the Wyoming InfraRed Observatory (WIRO). FHiRE features a traditional white pupil echelle design with R ~ 60,000 that is fed via two optical fibers from the telescope. Both the science fiber and a simultaneously sampled Thorium-Argon comparison fiber will make use of double mode scramblers. FHiRE itself will be housed within a vacuum enclosure in order to minimize any temperatue variations of the instrument and maximize its radial velocity precision. Together, these two features should enable FHiRE to reach a long-term velocity precision of < 1 m/s. We present the design of FHiRE and its expected performance. In a companion poster (Jang-Condell et al.) we will present the exoplanet science goals of the project.

PREPARACIÓN ELECTROQUÍMICA DE CAPAS NANOESTRUCTURADAS DE ZnO PARA APLICACIONES FOTOVOLTAICA

OpenAIRE

Moya Forero, Mónica Mercedes

2012-01-01

En esta tesis se centra en el estudio de capas delgadas basadas en óxido de zinc (ZnO) para aplicaciones fotovoltaicas, en concreto células solares sensibilizadas con colorante (DSSC). Se optimizaron los parámetros de crecimiento de estas nanoestructuras hibridas depositadas mediante la técnica de electrodeposición catódica para posteriormente desarrollar un dispositivo eficiente para la conversión de la luz. OBJETIVOS Los objetivos principales de la tesis son: - Establecer las co...

Spectrographic determination of dysprosium in doped crystals of calcium sulfate used for dosimetric material

International Nuclear Information System (INIS)

Grigoletto, T.; Lordello, A.R.

1984-01-01

A spectrographic method is described for the quantitative determination of dysprosium in doped crystals of calcium sulphate. The consequences of the changes in some parameters of the excitation conditions, such as arc current, electrode type and total or partial burning of sample, in the analytical results are discussed. Matrix effects are investigated. Variations in the intensity of the spectral lines are verified by recording the spectrum in distinct photographic plates. The role of internal standard in analytical reproducibility and in counterbalance of the variations in the arc current and in the weight of sample is studied. Accuracy is estimated by comparative analysis of two calcium sulphate samples by X-Ray Fluorescence, Neutron Activation and Inductive Coupled Plasma Emission Spectroscopy. (M.A.C.) [pt

CARMENES-NIR channel spectrograph cooling system AIV: thermo-mechanical performance of the instrument

Science.gov (United States)

Becerril, S.; Mirabet, E.; Lizon, J. L.; Abril, M.; Cárdenas, C.; Ferro, I.; Morales, R.; Pérez, D.; Ramón, A.; Sánchez-Carrasco, M. A.; Quirrenbach, A.; Amado, P.; Ribas, I.; Reiners, A.; Caballero, J. A.; Seifert, W.; Herranz, J.

2016-07-01

CARMENES is the new high-resolution high-stability spectrograph built for the 3.5m telescope at the Calar Alto Observatory (CAHA, Almería, Spain) by a consortium formed by German and Spanish institutions. This instrument is composed by two separated spectrographs: VIS channel (550-1050 nm) and NIR channel (950- 1700 nm). The NIR-channel spectrograph's responsible is the Instituto de Astrofísica de Andalucía (IAACSIC). It has been manufactured, assembled, integrated and verified in the last two years, delivered in fall 2015 and commissioned in December 2015. One of the most challenging systems in this cryogenic channel involves the Cooling System. Due to the highly demanding requirements applicable in terms of stability, this system arises as one of the core systems to provide outstanding stability to the channel. Really at the edge of the state-of-the-art, the Cooling System is able to provide to the cold mass ( 1 Ton) better thermal stability than few hundredths of degree within 24 hours (goal: 0.01K/day). The present paper describes the Assembly, Integration and Verification phase (AIV) of the CARMENES-NIR channel Cooling System implemented at IAA-CSIC and later installation at CAHA 3.5m Telescope, thus the most relevant highlights being shown in terms of thermal performance. The CARMENES NIR-channel Cooling System has been implemented by the IAA-CSIC through very fruitful collaboration and involvement of the ESO (European Southern Observatory) cryo-vacuum department with Jean-Louis Lizon as its head and main collaborator. The present work sets an important trend in terms of cryogenic systems for future E-ELT (European Extremely Large Telescope) large-dimensioned instrumentation in astrophysics.

MEGARA: a new generation optical spectrograph for GTC

Science.gov (United States)

Gil de Paz, A.; Gallego, J.; Carrasco, E.; Iglesias-Páramo, J.; Cedazo, R.; Vílchez, J. M.; García-Vargas, M. L.; Arrillaga, X.; Carrera, M. A.; Castillo-Morales, A.; Castillo-Domínguez, E.; Eliche-Moral, M. C.; Ferrusca, D.; González-Guardia, E.; Lefort, B.; Maldonado, M.; Marino, R. A.; Martínez-Delgado, I.; Morales Durán, I.; Mujica, E.; Páez, G.; Pascual, S.; Pérez-Calpena, A.; Sánchez-Penim, A.; Sánchez-Blanco, E.; Tulloch, S.; Velázquez, M.; Zamorano, J.; Aguerri, A. L.; Barrado y Naváscues, D.; Bertone, E.; Cardiel, N.; Cava, A.; Cenarro, J.; Chávez, M.; García, M.; Guichard, J.; Gúzman, R.; Herrero, A.; Huélamo, N.; Hughes, D.; Jiménez-Vicente, J.; Kehrig, C.; Márquez, I.; Masegosa, J.; Mayya, Y. D.; Méndez-Abreu, J.; Mollá, M.; Muñoz-Tuñón, C.; Peimbert, M.; Pérez-González, P. G.; Pérez Montero, E.; Rodríguez, M.; Rodríguez-Espinosa, J. M.; Rodríguez-Merino, L.; Rosa-González, D.; Sánchez-Almeida, J.; Sánchez Contreras, C.; Sánchez-Blázquez, P.; Sánchez Moreno, F. M.; Sánchez, S. F.; Sarajedini, A.; Serena, F.; Silich, S.; Simón-Díaz, S.; Tenorio-Tagle, G.; Terlevich, E.; Terlevich, R.; Torres-Peimbert, S.; Trujillo, I.; Tsamis, Y.; Vega, O.; Villar, V.

2014-07-01

MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the GTC 10.4m telescope in La Palma. MEGARA offers two IFU fiber bundles, one covering 12.5x11.3 arcsec2 with a spaxel size of 0.62 arcsec (Large Compact Bundle; LCB) and another one covering 8.5x6.7 arcsec2 with a spaxel size of 0.42 arcsec (Small Compact Bundle; SCB). The MEGARA MOS mode will allow observing up to 100 objects in a region of 3.5x3.5 arcmin2 around the two IFU bundles. Both the LCB IFU and MOS capabilities of MEGARA will provide intermediate-to-high spectral resolutions (RFWHM~6,000, 12,000 and 18,700, respectively for the low-, mid- and high-resolution Volume Phase Holographic gratings) in the range 3650-9700ÅÅ. These values become RFWHM~7,000, 13,500, and 21,500 when the SCB is used. A mechanism placed at the pseudo-slit position allows exchanging the three observing modes and also acts as focusing mechanism. The spectrograph is a collimator-camera system that has a total of 11 VPHs simultaneously available (out of the 18 VPHs designed and being built) that are placed in the pupil by means of a wheel and an insertion mechanism. The custom-made cryostat hosts an E2V231-84 4kx4k CCD. The UCM (Spain) leads the MEGARA Consortium that also includes INAOE (Mexico), IAA-CSIC (Spain), and UPM (Spain). MEGARA is being developed under a contract between GRANTECAN and UCM. The detailed design, construction and AIV phases are now funded and the instrument should be delivered to GTC before the end of 2016.

A mass spectrographic investigation of the methods for obtaining quantitative analyses for the mass balance of P and B through a submerged arc silicon smelter

International Nuclear Information System (INIS)

Rogers, D.E.C.; Jones, D.S.; Wegman, J.W.; Brain, L.; Van Wamelen, J.

1983-11-01

Mass spectrographic analyses of silica, silicon and silica reducing agents have been made using an arc discharge mass spectrograph. Analyses of certified standards and standard mixtures are given. An evaluation of doping techniques shows that the solid doping technique is satisfactory and that the liquid doping technique leads to significant errors. The amount of liquid dopant absorbed onto the substrate matrix varied from one compound to another and from one matrix to another. Comparison of analyses of solid-doped and undoped certified standards shows that all of the solid dopant is taken up by the sample. Analysis of silica reducing agents used in the arc reduction furnace shows that the major source of contamination by B and P is likely to be the coal and wood. Silica contains 0.4 ppm of B and 4 ppm of P and is a minor source of contamination. The levels in silicon are about 10 ppm for B and 20 ppm for P. A mass balance on P cannot be made and the missing amount is larger than the inaccuracy of the analysis. For analyses of feedstocks where the smelter outlet fumes are not sampled an accuracy of analysis to a factor of two is sufficient for the analysis of the coal and wood chips

Evaluating interactive digital television applications through usability heuristics Evaluando aplicaciones de televisión digital interactiva a través de heurísticas de usabilidad

Directory of Open Access Journals (Sweden)

Andrés Solano

2013-04-01

Full Text Available Interactive Digital Television (iDT is considered as the convergence of television and computer technologies. Usability evaluation for applications based on emerging information technology brings new challenges. The main iDT feature is that the user may interact with the application; therefore usability should be a main concern when designing iDT applications. Current research usually focuses on iDT applications from a technical point of view, rather than a user-centered approach. There is a need for new usability evaluation methods or at least for the use of traditional evaluations in novel ways. A set of specific usability heuristics was defined and validated, in order to help the usability evaluations of iDT applications. A usability checklist to be used when applying iDT heuristics is also proposed.La Televisión Digital Interactiva (TDi es considerada como la convergencia de la televisión y las tecnologías de la computación. La evaluación de usabilidad para aplicaciones basadas en tecnologías emergentes trae nuevos retos. La principal característica de la TDi es que los usuarios pueden interactuar con las aplicaciones; de esta manera la usabilidad es el principal aspecto a considerar cuando se diseñan aplicaciones de TDi. Las investigaciones actuales normalmente están enfocadas sobre las aplicaciones de TDi desde un punto de vista técnico, y no desde un enfoque centrado en el usuario. Hay una necesidad de nuevos métodos de evaluación de usabilidad o, por lo menos, utilizar de nuevas formas los métodos de evaluación existentes. Un conjunto de heurísticas de usabilidad específicas ha sido definido y validado, con el objetivo de ayudar en la evaluación de usabilidad de aplicaciones de TDi. También se ha propuesto una lista de verificación para ser usada al momento de aplicar las heurísticas de usabilidad.

Spectrographic determination of traces of boron in steels

International Nuclear Information System (INIS)

Alduan, F.A.; Roca, M.

1976-01-01

A spectrographic method has been developed to determine quantitatively boron in steels in the 0.5 to 250 ppm concentration range. The samples are dissolved in acids and transformed into oxides, avoiding boron losses by the addition of mannitol. For the fluoride evolution of boron in the dc arc the following compounds have been considered: CuF 2 , LiF, NaF, and SrF 2 . CuF 2 , at a concentration of 10%, provides the highest line-to-background intensity ratio. An arc current of 5 amperes eliminates the interference from iron spectrum on the most sensitive boron line - B 2497.7 A. Variations in chromium and nickel contents have no effect on the analytical results. (author)

Effectiveness of using a magnetic spectrograph with the Trojan Horse method

Science.gov (United States)

Manwell, S.; Parikh, A.; Chen, A. A.; de Séréville, N.; Adsley, P.; Irvine, D.; Hammache, F.; Stefan, I.; Longland, R. F.; Tomlinson, J.; Morfuace, P.; Le Crom, B.

2018-01-01

The Trojan Horse method relies on performing reactions in a specific kinematic phase space that maximizes contributions of a quasi-free reaction mechanism. The hallmark of this method is that the incident particle can be accelerated to high enough energies to overcome the Coulomb barrier of the target, but once inside the target nucleus the relative motion of the clustered nuclei allows the reaction of interest to proceed at energies below this Coulomb Barrier. This method allows the experimentalist to probe reactions that have significance in astrophysics at low reaction energies that would otherwise be impossible due to the vanishing cross section. Traditionally the Trojan Horse method has been applied with the use of silicon detectors to observe the reaction products. In this study we apply the Trojan Horse method to a well studied reaction to examine the potential benefits of using a splitpole magnetic spectrograph to detect one of the reaction products. We have measure the three body 7Li(d,αn)α reaction to constrain the energy 7Li(d,α)α cross section. Measurements were first made using two silicon detectors, and then by replacing one detector with the magnetic spectrograph. The experimental design, limitations, and early results are discussed.

Diseño e implmentación de maletas didácticas con los Mini PLCS LOGO y ZELIO para aplicaciones en secuencia de motores.

OpenAIRE

Mestanza Ortiz, Joan Jorge; Cruz Lindao, Bolivar Geovanny

2015-01-01

El presente trabajo de tesis contempla el diseño e implementación de módulos didácticos utilizando los mini PLCS LOGO y ZELIO, para aplicaciones en secuencia de motores de manera manual o automática, el cual tendrá como tarea única y primordial, las aplicaciones de arranque de motores existentes en la industria, de forma manual o automática los cuales serán implementados por los estudiantes de la carrera Ingeniería Electrónica e Ingeniería Eléctrica de la Universidad Politécnica Salesiana se...

Electrostatic Spectrograph with a Wide Range of Simultaneously Recorded Energies Composed of Two Coaxial Electrodes with Closed End Faces and a Discrete Combined External Electrode

Science.gov (United States)

Fishkova, T. Ya.

2018-01-01

An optimal set of geometric and electrical parameters of a high-aperture electrostatic charged-particle spectrograph with a range of simultaneously recorded energies of E/ E min = 1-50 has been found by computer simulation, which is especially important for the energy analysis of charged particles during fast processes in various materials. The spectrograph consists of two coaxial electrodes with end faces closed by flat electrodes. The external electrode with a conical-cylindrical form is cut into parts with potentials that increase linearly, except for the last cylindrical part, which is electrically connected to the rear end electrode. The internal cylindrical electrode and the front end electrode are grounded. In the entire energy range, the system is sharply focused on the internal cylindrical electrode, which provides an energy resolution of no worse than 3 × 10-3.

Aplicaciones de los autómatas celulares a la generación de bits

OpenAIRE

Hernández Encinas, Luis; Martín del Rey, Angel; Rodríguez Sánchez, Gerardo

2002-01-01

Se presentan en este artículo la principales propiedades de los autómatas celulares lineales, y en particular de los llamados de Wolfram. Se definen, además, algunas nociones de criptografía con el fin de señalar las principales aplicaciones de los autómatas celulares a la misma, como la generación de números pseudoaleatorios para los cifrados en flujo o la generación de claves.

Aplicaciones web para móvil: Estudio y desarrollo de una plataforma web orientada a la telemedicina

OpenAIRE

Gutiérrez Díez, Pablo

2013-01-01

En el presente Trabajo Fin de Máster, se realiza un estudio y desarrollo de una plataforma web para dispositivos móviles orientada a la telemedicina, concretamente en el campo de la salud mental. Las aplicaciones mHealth (Mobile Health) se encuentran en auge y continuarán siendo un factor importante en la asistencia sanitaria, dado que ...

Biotecnologia Ambiental. Aplicacions biotecnològiques a la millora del medi ambient

OpenAIRE

Blanch i Gisbert, Anicet

2010-01-01

La biotecnología ambiental comprende el conjunto de actividades tecnológicas que facilitan la comprensión y la gestión de los sistemas biológicos en el medio ambiente, con el fin de proveer productos y servicios. Actualmente, la gestión del medio ambiente y de sus recursos naturales no se comprende si no se realiza de manera sostenible. Los avances científicos y tecnológicos le están permitiendo a la biotecnología ambiental, el desarrollo de nuevas herramientas y aplicaciones con los que resp...

APRENDIZAJE BASADO EN EJEMPLOS: DESARROLLO DE APLICACIONES EMPRESARIALES CON TECNOLOGÍAS .NET

Directory of Open Access Journals (Sweden)

Marcos Gestal

2015-06-01

Full Text Available RESUMEN: El framework J2EE ha sido el gran dominador, durante mucho tiempo, en el desarrollo de aplicaciones empresariales. Esto hecho originó la aparición de un rico ecosistema de herramientas, manuales, tutoriales, etc., que explican las diferentes alternativas o peculiaridades a la hora de su implementación. La irrupción de .NET Framework, en el ámbito empresarial, ha producido una fuerte demanda de implementación de aplicaciones bajo dicha arquitectura. Sin embargo, la cantidad o calidad de la documentación disponible dista considerablemente con respecto a la existente, su principal alternativa (J2EE. Esta laguna de documentación, es especialmente visible y preocupante cuando se establece como objetivo dar a conocer los conceptos del framework, desde un punto de vista docente, a los futuros egresados del Grado en Ingeniería en Informática. Este trabajo describe el enfoque docente seguido, para alcanzar el citado objetivo de familiarizar a los alumnos con este framework alternativo y las prácticas habituales de modelo dentro de éste. Para ello, se basa principalmente de un conjunto de sencillos tutoriales con los que mostrar los fundamentos de la tecnología y dos aplicaciones completas (miniportal y minibank en las que se muestra cómo aplicar patrones de diseño, a la hora de abordar una aplicación empresarial. ABSTRACT: For a long time, J2EE has been the dominating framework for the development of business applications. This fact resulted in a rich ecosystem of tools, manuals, tutorials, etc. that explain different implementation alternatives or peculiarities. The incursion of .NET Framework in the business environment has generated a strong demand of application implementation under this architecture. However, the quantity and quality of documents available significantly differs from its main alternative (J2EE. This documentation gap is especially visible and worrying when the objective is to teach the concepts of Framework

Implementación de un sistema de desarrollo de aplicaciones en contenedores Docker y su automatización a través de un bot de Slack

OpenAIRE

Redondo de Álvaro, Eloy

2017-01-01

Este trabajo trata del desarrollo y la implementación de un nuevo sistema de automatización para el desarrollo de aplicaciones en la empresa MADISON Experience Marketing en la que me encuentro realizando una beca. El sistema de automatización empleará un sistema de desarrollo de aplicaciones en contenedores Docker. Gracias a este sistema, el desarrollo por parte de los distintos equipos de la empresa, podrá realizarse de una forma más ágil e independiente. El sistema consistirá en tres ...

Performances of X-shooter, the new wide-band intermediate resolution spectrograph at the VLT

NARCIS (Netherlands)

Vernet, J.; Dekker, H.; D'Odorico, S.; Mason, E.; Di Marcantonio, P.; Downing, M.; Elswijk, E.; Finger, G.; Fischer, G.; Kerber, F.; Kern, L.; Lizon, J.-L.; Lucuix, C.; Mainieri, V.; Modigliani, A.; Patat, F.; Ramsay, S.; Santin, P.; Vidali, M.; Groot, P.; Guinouard, I.; Hammer, F.; Kaper, L.; Kjærgaard-Rasmussen, P.; Navarro, R.; Randich, S.; Zerbi, F.

2010-01-01

X-shooter is the first second-generation instrument newly commissioned a the VLT. It is a high efficiency single target intermediate resolution spectrograph covering the range 300 - 2500 nm in a single shot. We summarize the main characteristics of the instrument and present its performances as

ANÁLISIS COMPARATIVO DE FRAMEWORKS PARA EL DESARROLLO DE APLICACIONES WEB EN JAVA

OpenAIRE

Sánchez Acosta, Carlos; Universidad Señor de Sipán; Tuesta Monteza, Victor; Universidad Señor de Sipán; Mejía Cabrera, Iván

2015-01-01

En éste documento se presenta un análisis comparativo de frameworks en Java para el desarrollo de aplicaciones web, aplicando una matriz de un modelo de evaluación. Para analizar los frameworks y seleccionarlos se realizó en base a criterios de madurez y documentación, obteniendo como resultado los Frameworks Spring, Struts, JSF, Angular JS para su evaluación.  Asimismo para el análisis teórico de frameworks se formuló un método QSOS, concebido para definir características comparativas del so...

Sistema de autenticidad para aplicaciones de análisis de eventos para seguridad.

OpenAIRE

ESCAMILLA PARDO, TONI

2017-01-01

[ES] En este proyecto se afronta la creación de un sistema distribuido capaz de garantizar, en aplicaciones empleadas para el análisis de eventos de seguridad, la autenticidad de los datos transmitidos entre el host cliente y servidor con el fin de asegurar la integridad de los mismos en la transmisión entre ambas partes, así como evitar la posible alteración en el destino. Para ello, se utilizará la tecnología blockchain a modo de base de datos en la que se almacenen los hashe...

Potenciales singulares en sistemas cuánticos tridimensionales y aplicaciones físicas.

OpenAIRE

Santamaría Sanz, Lucía

2017-01-01

El presente trabajo pretende abordar el análisis de un problema de mecánica cuántica con interés por sus potenciales aplicaciones en física de materiales (en especial aislantes topológicos) y en física de agujeros negros. Fundamentalmente se trata de resolver la ecuación de Schrödinger (caso no relativista) en tres dimensiones espaciales (3D) para un potencial singular con simetría radial del tipo V (r) = A δ(r − r0) Interesan tanto sus estados ligados (interpretados como...

Semi-quantitative spectrographic determination of traces of elements in igneous rocks

International Nuclear Information System (INIS)

Costa, M.Q. da; Eichhoff, H.-J.

1982-01-01

A semi-quantitative spectrographic technique based on Harveys'method, using background radiation as internal standard is described for the analysis of trace elements in igneous rocks by the total energy method. A certain amount of the sample was completely vapourized in a DC arc with anodic excitation under argon and oxygen atmosphere, using graphite electrodes of standard dimensions. In the processed film, selected lines and adjancent backgrounds were evaluated by densitometry and the corresponding intensity ratios were calculated. Sensitivity factors were determined for the analytical lines of Co, Cu, Ga, Ni, Sc, Sr, V, Y, Zn, and Zr in geological standards (G-2, BCR-1, AGV-1, GSP-1) from the United States Geological Survey. Matrix effects between samples and standards were minimized by using the above mentioned geological standards. An average value of the sensitivity factors was employed for the calculation of the concentration of the elements in the samples. A comparison between the results obtained by this method and those from the analysis of zinc by atomic absorption is presented. This method enabled the analyses of igneous rock samples having SiO2 contents between 40 and 80%, with an error in the determinations of trace elements less than 30%.(Author) [pt

"Slit Mask Design for the Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph"

Science.gov (United States)

Williams, Darius; Marshall, Jennifer L.; Schmidt, Luke M.; Prochaska, Travis; DePoy, Darren L.

2018-01-01

The Giant Magellan Telescope Multi-object Astronomical and Cosmological Spectrograph (GMACS) is currently in development for the Giant Magellan Telescope (GMT). GMACS will employ slit masks with a usable diameter of approximately 0.450 m for the purpose of multi-slit spectroscopy. Of significant importance are the design constraints and parameters of the multi-object slit masks themselves as well as the means for mapping astronomical targets to physical mask locations. Analytical methods are utilized to quantify deformation effects on a potential slit mask due to thermal expansion and vignetting of target light cones. Finite element analysis (FEA) is utilized to simulate mask flexure in changing gravity vectors. The alpha version of the mask creation program for GMACS, GMACS Mask Simulator (GMS), a derivative of the OSMOS Mask Simulator (OMS), is introduced.

Exoplanets search and characterization with the SOPHIE spectrograph at OHP

Directory of Open Access Journals (Sweden)

Hébrard G.

2011-02-01

Full Text Available Several programs of exoplanets search and characterization have been started with SOPHIE at the 1.93-m telescope of Haute-Provence Observatory, France. SOPHIE is an environmentally stabilized echelle spectrograph dedicated to high-precision radial velocity measurements. The objectives of these programs include systematic searches for exoplanets around different types of stars, characterizations of planet-host stars, studies of transiting planets through RossiterMcLaughlin effect, follow-up observations of photometric surveys. The instrument SOPHIE and a review of its latest results are presented here.

Gas turbine application in power plants of Mexican refineries; Aplicacion de turbinas de gas en plantas de fuerza de refinerias mexicanas

Energy Technology Data Exchange (ETDEWEB)

Alcaraz Calderon, A. M.; Rodriguez Martinez, H.; Garcia Paredes, Job; Morales Guillen, Magdalena; Manzanares Papayanapolous, Emilio [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: malcaraz@iie.org.mx; jhrm@iie.org.mx; jgarcia@iie.org.mx; mmmg@iie.org.mx; emp@iie.org.mx

2010-11-15

This article presents an overview of the application to have the gas turbine power generation systems, electric and steam for Mexican refineries. First there is a general description of the gas turbines and heat recovery (system components CHP) and CHP schemes are based on gas turbines capable of use in Mexican refineries. Subsequently referred to the characteristics of energy consumption (steam and electricity) from Mexican refineries and performs a technical analysis of CHP schemes based on gas turbines from the point of view of rates Q/W, power efficiencies and combined concluded that by their nature are very useful for refinery and gives some recommendations for improved implementation. [Spanish] En este articulo se presenta una vision general de la aplicacion que tienen las turbinas de gas en sistemas de generacion de energia electrica y vapor para refinerias mexicanas. Primeramente se da una descripcion general de las turbinas de gas y recuperadores de calor (componentes principales del sistema de cogeneracion) y se muestran los esquemas de cogeneracion basados en turbinas de gas susceptibles de utilizar en refinerias mexicanas. Posteriormente se mencionan las caracteristicas de consumos energeticos (vapor y energia electrica) de las refinerias mexicanas y se realiza un analisis tecnico de los esquemas de cogeneracion basado en turbinas de gas desde el punto de vista de tasas Q/W, eficiencias electricas y combinadas, concluyendose que por sus caracteristicas son muy utiles para refinerias y se dan algunas recomendaciones para su mejor aplicacion.

The Performance and Scientific Rationale for an Infrared Imaging Fourier Transform Spectrograph on a Large Space Telescope

National Research Council Canada - National Science Library

Graham, James R; Abrams, Mark; Bennett, C; Carr, J; Cook, K; Dey, A; Najita, J; Wishnow, E

1998-01-01

.... We consider the relationship between pixel size, spectral resolution, and diameter of the beam splitter for imaging and nonimaging Fourier transform spectrographs and give the condition required...

Spectrographic determination of impurities in ammonium hydrogen fluoride samples

International Nuclear Information System (INIS)

Roca, M.; Capdevila, C.; Alduan, F.A.

1976-01-01

The quantitative spectrographic trace determination of Al, B, Cr, Cu, Fe, Mn, Mo, Ni, Pb and Si in ammonium hydrogen fluoride samples is considered. 10 A dc arc excitation and graphite electrodes with crate either 4.5 mm or 8 mm deep are employed. A comparison of various matrices such as graphite, gallium oxide, germanium oxide, magnesium oxide and zinc oxide, in the ratios 1:1 and 1:3, as well as a mixture 50% graphite - 50% zinc oxide in the ratio 1:1 is included. Zinc oxide in the ratio 1:1 and 4x8 mm craters show the best over-all results. (author)

Spectrographic mask for digital registration of bright source spectra

Directory of Open Access Journals (Sweden)

Ademir Xavier

2017-08-01

Full Text Available In this work we present schematic diagrams for the construction of a spectrographic mask attachable to a camera objective in order to capture spectra using simple CD or DVD gratings. The mask is made of two parts: an adapter ring and elbow-shaped blockage for suitable registration of spectra in the lab and outdoors. By using a free software, we analyze and discuss the calibration of the wavelength scale of the solar spectrum, which allows us to identify many chemical elements in it. In the conclusion, we further discuss some interesting projects to be carried out by students using the idea.

The SLICE, CHESS, and SISTINE Ultraviolet Spectrographs: Rocket-Borne Instrumentation Supporting Future Astrophysics Missions

Science.gov (United States)

France, Kevin; Hoadley, Keri; Fleming, Brian T.; Kane, Robert; Nell, Nicholas; Beasley, Matthew; Green, James C.

2016-03-01

NASA’s suborbital program provides an opportunity to conduct unique science experiments above Earth’s atmosphere and is a pipeline for the technology and personnel essential to future space astrophysics, heliophysics, and atmospheric science missions. In this paper, we describe three astronomy payloads developed (or in development) by the Ultraviolet Rocket Group at the University of Colorado. These far-ultraviolet (UV) (100-160nm) spectrographic instruments are used to study a range of scientific topics, from gas in the interstellar medium (accessing diagnostics of material spanning five orders of magnitude in temperature in a single observation) to the energetic radiation environment of nearby exoplanetary systems. The three instruments, Suborbital Local Interstellar Cloud Experiment (SLICE), Colorado High-resolution Echelle Stellar Spectrograph (CHESS), and Suborbital Imaging Spectrograph for Transition region Irradiance from Nearby Exoplanet host stars (SISTINE) form a progression of instrument designs and component-level technology maturation. SLICE is a pathfinder instrument for the development of new data handling, storage, and telemetry techniques. CHESS and SISTINE are testbeds for technology and instrument design enabling high-resolution (R>105) point source spectroscopy and high throughput imaging spectroscopy, respectively, in support of future Explorer, Probe, and Flagship-class missions. The CHESS and SISTINE payloads support the development and flight testing of large-format photon-counting detectors and advanced optical coatings: NASA’s top two technology priorities for enabling a future flagship observatory (e.g. the LUVOIR Surveyor concept) that offers factors of ˜50-100 gain in UV spectroscopy capability over the Hubble Space Telescope. We present the design, component level laboratory characterization, and flight results for these instruments.

Interactive applications for energy saving; Aplicaciones interactivas para ahorro de energia

Energy Technology Data Exchange (ETDEWEB)

Adame Gonzalez, Alejandro; Ramirez Anaya, Cesar; Gutierrez, Hector; Dominguez Ojeda, Xerxes; Aguilar Galvan, Alfredo [Ingenieria Energetica Integral S. A. de C. V., Mexico, D. F. (Mexico)

1998-12-31

A series of ideas are presented that can help in the development of interactive applications for energy saving. Emphasis is made on the Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE)`s Interactive Course on Demand Management and Power Factor Compensation, in order to demonstrate how far one can go with the multimedia development. [Espanol] Se presenta un conjunto de ideas que pueden auxiliar en la elaboracion de aplicaciones interactivas para ahorro de energia. Se hace principal enfasis sobre el curso interactivo Administracion de la Demanda y Compensacion del Factor de Potencia del Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE) con la finalidad de mostrar hasta donde puede llegarse con un desarrollo multimedia.

Interactive applications for energy saving; Aplicaciones interactivas para ahorro de energia

Energy Technology Data Exchange (ETDEWEB)

Adame Gonzalez, Alejandro; Ramirez Anaya, Cesar; Gutierrez, Hector; Dominguez Ojeda, Xerxes; Aguilar Galvan, Alfredo [Ingenieria Energetica Integral S. A. de C. V., Mexico, D. F. (Mexico)

1999-12-31

A series of ideas are presented that can help in the development of interactive applications for energy saving. Emphasis is made on the Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE)`s Interactive Course on Demand Management and Power Factor Compensation, in order to demonstrate how far one can go with the multimedia development. [Espanol] Se presenta un conjunto de ideas que pueden auxiliar en la elaboracion de aplicaciones interactivas para ahorro de energia. Se hace principal enfasis sobre el curso interactivo Administracion de la Demanda y Compensacion del Factor de Potencia del Fideicomiso de Apoyo al Programa de Ahorro de Energia (FIDE) con la finalidad de mostrar hasta donde puede llegarse con un desarrollo multimedia.

Herramientas y recursos para la creación y consumo musical en la web 2.0. Aplicaciones y potencialidades educativas

Directory of Open Access Journals (Sweden)

Felipe Gértrudix Barrio

2014-01-01

Full Text Available Desde la aparición de Internet, y en especial el desarrollo de los servicios y herramientas que caracterizan a la web 2.0, la creación y el consumo musical se han expandido significativamente. En ese proceso, los nativos digitales, usuarios activos de estos nuevos medios, experimentan e innovan continuamente con nuevas formas de producir y disfrutar la música de forma colectiva en entornos distribuidos de Red. El articulo evalúa las posibilidades de integración de esta realidad como un activo educativo en las aulas de música de Enseñanza Secundaria, analizando cuales son los servicios y herramientas que ofrecen mejores posibilidades para facilitar dinámicas y estrategias didácticas innovadoras de aprendizaje musical. Para ello, se ha realizado una amplia revisión documental de fuentes de referencia publicadas en los últimos 15 anos referidas a las potencialidades didácticas musicales de la creación colaborativa en Red, se ha elaborado un corpus de servicios y aplicaciones web 2.0 de creación y consumo musical, y se ha analizado una muestra de estas para determinar sus características y aplicaciones educativas concretas. Se concluye el articulo manifestando la oportunidad que el uso de estas aplicaciones representa para mejorar la predisposición de los estudiantes hacia la materia, la incentivan de los procesos creativos musicales, el desarrollo de competencias especificas de análisis y composición y la capacidad critica y reflexiva tanto sobre el proceso creador como sobre el producto musical alcanzado.

Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST-AFTA

Science.gov (United States)

Gong, Qian; Mcelwain, Michael; Greeley, Bradford; Grammer, Bryan; Marx, Catherine; Memarsadeghi, Nargess; Stapelfeldt, Karl; Hilton, George; Sayson, Jorge Llop; Perrin, Marshall;

Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) for WFIRST/AFTA

Science.gov (United States)

Gong, Qian; Mcelwain, Michael; Greeley, Bradford; Grammer, Bryan; Marx, Catherine; Memarsadeghi, Nargess; Stapelfeldt, Karl; Hilton, George; Sayson, Jorge Llop; Perrin, Marshall;

The Oxford SWIFT integral field spectrograph

Science.gov (United States)

Thatte, Niranjan; Tecza, Matthias; Clarke, Fraser; Goodsall, Timothy; Lynn, James; Freeman, David; Davies, Roger L.

2006-06-01

We present the design of the Oxford SWIFT integral field spectrograph, a dedicated I and z band instrument (0.65μm micron - 1.0μm micron at R~4000), designed to be used in conjunction with the Palomar laser guide star adaptive optics system (PALAO, and its planned upgrade PALM-3000). It builds on two recent developments (i) the improved ability of second generation adaptive optics systems to correct for atmospheric turbulence at wavelengths less than or equal to 1μm micron, and (ii) the availability of CCD array detectors with high quantum efficiency at very red wavelengths (close to the silicon band edge). Combining these with a state-of-the-art integral field unit design using an all-glass image slicer, SWIFT's design provides very high throughput and low scattered light. SWIFT simultaneously provides spectra of ~4000 spatial elements, arranged in a rectangular field-of-view of 44 × 89 pixels. It has three on-the-fly selectable pixel scales of 0.24", 0.16" and 0.08'. First light is expected in spring 2008.

Spectrographic determination of impurities in magnesium metal; Determinacion espectrografica de impurezas en magnesio

Energy Technology Data Exchange (ETDEWEB)

Capdevila, C.; Diaz-Guerra, J. P.

1979-07-01

The spectrographic determination of trace quantities of Al, B, Cd, Co, Cr, Cu, Fe, Li, Hn, Mo, Ni and Si in magnesium metal is described. Samples are dissolved with HNO{sub 3} and calcinate into MgO. In order to avoid losses of boron NH{sub 4}OH is added to the nitric solution. Except for aluminium and chromium the analysis is performed through the use of the carrier distillation technique. These two impurities are determined by burning to completion the MgO. Among the compounds studied as carriers (AgCl, AgF, CsCl, CuF{sub 2}, KCl and SrF{sub 2}) AgCl allows, In general, the best volatilization efficiency. Lithium determination is achieved by using KC1 or CsCl. Detection limits, on the basis of MgO, are in the range 0,1 to 30 ppm, depending on the element. (Author) 8 refs.

Desenvolupament d'aplicacions web en Django sobre servidor apache, gestionades amb mòdul WSGI i relacionades amb base de dades Postgresql

OpenAIRE

Bosch Gascón, Carlos

2013-01-01

Desenvolupament d'aplicacions web en Django per al Segon Concurs de fotografia matemàtica FotoMath 2011. Allotjades en servidor Apachez, gestionades amb mòdul wsgi i relacionades amb una base de dades postgresql.

Métodos matriciales en óptica : aplicaciones en óptica geométrica, ondulatoria y estadística

NARCIS (Netherlands)

Alieva, T.; Rodrigo Martín-Romo, J.A.; Martínez Matos, O.; Bastiaans, M.J.; Cámara Iglesias, A.; Asenjo García, A.; Calvo, M.L.

2009-01-01

Este proyecto de innovación educativa se centra en la descripción y caracterización de sistemas ópticos paraxiales así como en el estudio de sus principales aplicaciones en procesado de información. El lector encontrará un nivel creciente en dificultad y exigencia a lo largo de los capítulos

Near InfraRed Imaging Spectrograph (NIRIS) for ground-based mesospheric OH(6-2) and O2(0-1) intensity and temperature measurements

Science.gov (United States)

Singh, Ravindra P.; Pallamraju, Duggirala

2017-08-01

This paper describes the development of a new Near InfraRed Imaging Spectrograph (NIRIS) which is capable of simultaneous measurements of OH(6-2) Meinel and O2(0-1) atmospheric band nightglow emission intensities. In this spectrographic technique, rotational line ratios are obtained to derive temperatures corresponding to the emission altitudes of 87 and 94 km. NIRIS has been commissioned for continuous operation from optical aeronomy observatory, Gurushikhar, Mount Abu (24.6°N, 72.8°E) since January 2013. NIRIS uses a diffraction grating of 1200 lines mm^{-1} and 1024× 1024 pixels thermoelectrically cooled CCD camera and has a large field-of-view (FOV) of 80° along the slit orientation. The data analysis methodology adopted for the derivation of mesospheric temperatures is also described in detail. The observed NIRIS temperatures show good correspondence with satellite (SABER) derived temperatures and exhibit both tidal and gravity waves (GW) like features. From the time taken for phase propagation in the emission intensities between these two altitudes, vertical phase speed of gravity waves, cz, is calculated and along with the coherent GW time period `τ ', the vertical wavelength, λ z, is obtained. Using large FOV observations from NIRIS, the meridional wavelengths, λ y, are also calculated. We have used one year of data to study the possible cause(s) for the occurrences of mesospheric temperature inversions (MTIs). From the statistics obtained for 234 nights, it appears that in situ chemical heating is mainly responsible for the observed MTIs than the vertical propagation of the waves. Thus, this paper describes a novel near infrared imaging spectrograph, its working principle, data analysis method for deriving OH and O2 emission intensities and the corresponding rotational temperatures at these altitudes, derivation of gravity wave parameters (τ , cz, λ z, and λ y), and results on the statistical study of MTIs that exist in the earth's mesospheric

Ecarga y la estrategia de marketing digital para aplicaciones móviles

OpenAIRE

Hervella Baturone, Beatriz

2013-01-01

RESUMEN: Ecarga y la estrategia de marketing digital para aplicaciones móviles es un proyecto que trata de recoger cuáles son las principales aspectos que se deben tener en cuenta a la hora de promocionar una aplicación móvil. El trabajo consta de una primera parte, de contenido más teórico, que trata el contexto actual del mercado móvil y una segunda parte, de contenido más práctico, que consta de la descripción y documentación real de la estrategia de promoción seguida por la aplicación móv...

Características generales, propiedades, yacimientos y aplicaciones de pirofilita. II. Yacimientos, aplicaciones y utilización como materia prima cerámica

Directory of Open Access Journals (Sweden)

Sánchez Soto, P. J.

1998-10-01

Full Text Available In this work, the main world deposits of pyrophyllite are indicated according to the literature, showing the available production data. It is emphasized the research focusing on mining and characterization of raw materials containing pyrophyllite, which shows a marked applied interest. It is described and reviewed the most relevant applications of pyrophyllite and pyrophyllite raw materials, in especial refractories and ceramics, fillers, building materials, catalysts and as a high-pressure medium for synthesis of materials. Finally, it is also described and reviewed its use as raw material for the preparation of advanced materials, such as sialon, emphasizing the possibilities of application of pyrophyllite raw materials in our country as a result of distinct investigations of relevant interest performed by several Research Institutes and University Departments. It is deduced that pyrophyllite and pyrophyllite raw materials are increasing in relative importance in many applied fields, as compared with other layer silicates, such as talc and kaolinite.

En este trabajo se indican los principales yacimientos mundiales de pirofilita según la bibliografía, los datos de producción disponibles, además de revisar las investigaciones más destacadas sobre prospección y caracterización de materias primas que contienen pirofilita y que presentan un marcado interés aplicado. Se realiza una amplia revisión de las principales aplicaciones a las que se destinan dichas materias primas, en especial para la preparación de materiales cerámicos y refractarios, su uso como carga, en la construcción, obtención de catalizadores y síntesis de materiales a alta presión debido a sus propiedades. Por último, se describen y revisan sus aplicaciones en la preparación de nuevos materiales y materiales avanzados, como son los sialones, destacando su potencial de utilización en nuestro país como resultado de diversas investigaciones de inter

PEPSI, the High-Resolution Optical-IR Spectrograph for the LBT

Science.gov (United States)

Andersen, Michael; Strassmeier, Klaus; Hoffman, Axel; Woche, Manfred; Spano, Paolo

PEPSI is a high resolution fibre feed optical-IR polarimetric echelle spectrograph for the Large Binocular Telescope (LBT). PEPSI utilizes the two 8.4m LBT apertures to simultaneously record four polarization states at a resolution of 120.000. The extension of the coverage towards the IR is mainly motivated by the larger Zeeman splitting of IR lines, which would allow to study weaker/fainter magnetic structures on stars. The two optical arms, which also have an integral light mode with R up to 300.000, are under construction, while the IR arm is being designed.

Quantitative spectrographic determination of traces of manganese in ferric oxide

International Nuclear Information System (INIS)

Capdevila, C.; Roca, M.

1968-01-01

In order to enhance the sensitivity, different electrode types and sweeping substances have been studied. Graphite anodes, with 5 x 2,5, 4 x 4,5, 4 x 8 and 7 x 10 mm crater, as well as CuF 2 , AgCl, ZnO and graphite powder as sweeping materials, have been tested. A JACO-Ebert grating spectrograph and 10 amp. d.c. arc have been employed, choosing the proper exposure times from moving-plate studies. Using 4 x 4,5 mm electrodes and 75% AgCl a detection limit of 0,2 ppm is attainable. (Author) 7 refs

Application techniques of coatings by thermal projection; Tecnicas de aplicacion de recubrimientos por proyeccion termica

Energy Technology Data Exchange (ETDEWEB)

Porcayo Calderon, Jesus [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1995-12-31

The coatings applied by thermal projection have an important number of applications in different industries (chemical, oil, electric, nuclear, etc.). The main purpose of the protection by means of coatings is to alter the surface characteristics of a component so as to resist corrosive environments, abrasion and erosion, among others. The coatings can be applied by different methods, but due to the fact that its characteristics appreciably differ from the base metal, it is important the knowledge of its properties when a coating is selected for a specific use. In this article the characteristics of the applied coatings by thermal projection, the factors that affect its performance and the principal application techniques, are described. [Espanol] Los recubrimientos aplicados por proyeccion termica tienen un numero importante de aplicaciones en diferentes industrias (quimica, petrolera, electrica, nuclear, etc.). El proposito principal de la proteccion por medio de recubrimientos es alterar las caracteristicas de la superficie de un componente de manera que resista ambientes corrosivos, abrasion y erosion, entre otros. Los recubrimientos pueden aplicarse por diferentes metodos, pero debido a que sus propiedades difieren apreciablemente de las del metal base, es importante el conocimiento de sus propiedades cuando se selecciona un recubrimiento para un uso especifico. En este articulo se describen las caracteristicas de los recubrimientos aplicados por proyeccion termica, los factores que afectan su desempeno y las principales tecnicas de aplicacion.

Application techniques of coatings by thermal projection; Tecnicas de aplicacion de recubrimientos por proyeccion termica

Energy Technology Data Exchange (ETDEWEB)

Porcayo Calderon, Jesus [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1996-12-31

The coatings applied by thermal projection have an important number of applications in different industries (chemical, oil, electric, nuclear, etc.). The main purpose of the protection by means of coatings is to alter the surface characteristics of a component so as to resist corrosive environments, abrasion and erosion, among others. The coatings can be applied by different methods, but due to the fact that its characteristics appreciably differ from the base metal, it is important the knowledge of its properties when a coating is selected for a specific use. In this article the characteristics of the applied coatings by thermal projection, the factors that affect its performance and the principal application techniques, are described. [Espanol] Los recubrimientos aplicados por proyeccion termica tienen un numero importante de aplicaciones en diferentes industrias (quimica, petrolera, electrica, nuclear, etc.). El proposito principal de la proteccion por medio de recubrimientos es alterar las caracteristicas de la superficie de un componente de manera que resista ambientes corrosivos, abrasion y erosion, entre otros. Los recubrimientos pueden aplicarse por diferentes metodos, pero debido a que sus propiedades difieren apreciablemente de las del metal base, es importante el conocimiento de sus propiedades cuando se selecciona un recubrimiento para un uso especifico. En este articulo se describen las caracteristicas de los recubrimientos aplicados por proyeccion termica, los factores que afectan su desempeno y las principales tecnicas de aplicacion.

Exploración de viabilidad sobre ideas de aplicaciones en el mercado colombiano

OpenAIRE

Tarazona Ocampo, Andrés Felipe; Soto Florez, María Paz; Camacho Cala, Paula Vanessa

2016-01-01

La economía mundial cambia a un ritmo vertiginoso y exponencial gracias a la rápida transformación de la tecnología. Diferentes dinámicas como el crecimiento en cobertura del internet; la creciente facilidad de obtención de una tarjeta de crédito; la popularización del uso de smartphones; y el crecimiento en uso del comercio electrónico; han dado cabida a la aparición de nuevos tipos de negocio, como el de servicios electrónicos y aplicaciones, que hace algunas décadas atrás eran inviables. ...

Conditional-sampling spectrograph detection system for fluorescence measurements of individual airborne biological particles

Science.gov (United States)

Nachman, Paul; Pinnick, R. G.; Hill, Steven C.; Chen, Gang; Chang, Richard K.; Mayo, Michael W.; Fernandez, Gilbert L.

1996-03-01

We report the design and operation of a prototype conditional-sampling spectrograph detection system that can record the fluorescence spectra of individual, micrometer-sized aerosols as they traverse an intense 488-nm intracavity laser beam. The instrument's image-intensified CCD detector is gated by elastic scattering or by undispersed fluorescence from particles that enter the spectrograph's field of view. It records spectra only from particles with preselected scattering-fluorescence levels (a fiber-optic-photomultiplier subsystem provides the gating signal). This conditional-sampling procedure reduces data-handling rates and increases the signal-to-noise ratio by restricting the system's exposures to brief periods when aerosols traverse the beam. We demonstrate these advantages by reliably capturing spectra from individual fluorescent microspheres dispersed in an airstream. The conditional-sampling procedure also permits some discrimination among different types of particles, so that spectra may be recorded from the few interesting particles present in a cloud of background aerosol. We demonstrate such discrimination by measuring spectra from selected fluorescent microspheres in a mixture of two types of microspheres, and from bacterial spores in a mixture of spores and nonfluorescent kaolin particles.

Calculation of the performance of the INS iron-free π√2 spectrometer as a spectrograph

International Nuclear Information System (INIS)

Fujioka, M.; Hirasawa, M.; Kawakami, H.

1983-02-01

The performance of the INS iron-free π√2 beta-ray spectrometer of the current-loop type is calculated with a view of using it as a spectrograph, i.e., in a multichannel mode with a position-sensitive proportional counter. For the momentum resolution of R = 0.01 and 0.1 % the usable momentum range as a spectrograph ( + epsilon + 0 ) and the line shapes on the focal plane are calculated. The transmission of the baffle is 0.025 and 0.13 % of 4π and the expected gain of data-collection efficiency over the single-channel mode is 140 and 40 for R = 0.01 and 0.1%, respectively. An effective tilting of the focal plane due to the entrance baffle is discussed as well as the problems with arrangement and testing of the position detector. (author)

Status and Performance Updates for the Cosmic Origins Spectrograph

Science.gov (United States)

Snyder, Elaine M.; De Rosa, Gisella; Fischer, William J.; Fix, Mees; Fox, Andrew; Indriolo, Nick; James, Bethan; Oliveira, Cristina M.; Penton, Steven V.; Plesha, Rachel; Rafelski, Marc; Roman-Duval, Julia; Sahnow, David J.; Sankrit, Ravi; Taylor, Joanna M.; White, James

2018-01-01

The Hubble Space Telescope's Cosmic Origins Spectrograph (COS) moved the spectra on the FUV detector from Lifetime Position 3 (LP3) to a new pristine location, LP4, in October 2017. The spectra were shifted in the cross-dispersion direction by -2.5" (roughly -31 pixels) from LP3, or -5" (roughly -62 pixels) from the original LP1. This move mitigates the adverse effects of gain sag on the spectral quality and accuracy of COS FUV observations. Here, we present updates regarding the calibration of FUV data at LP4, including the flat fields, flux calibrations, and spectral resolution. We also present updates on the time-dependent sensitivities and dark rates of both the NUV and FUV detectors.

Aplicaciones de la tecnologia de control termico y de madurez del concreto en Colombia

OpenAIRE

Quimbay Herrera, Rodrigo

2009-01-01

La Tecnología del control térmico y de madurez del concreto (TCTM) tiene un potencial muy amplio en la industria del cemento y del concreto en Colombia, tanto por sus múltiples aplicaciones en los procesos de control de calidad en obra (instrumentación de elementos, control de probetas), como en el control de calidad de recepción en planta para la materia prima (control en tiempo real del cemento). Igualmente, en el control de producción de las diferentes mezclas (e...

Aplicaciones del Caos y la Complejidad en la Cadena de Suministros del Sector Agroindustrial

OpenAIRE

Lara Atencia, Manuel Santiago

2016-01-01

La presente investigación consiste en determinar las aplicaciones existentes de las teorías del caos y las teorías de la complejidad en la cadena de suministro del sector agroindustrial colombiano. Además, tiene como propósito describir el sector de la agroindustria y la cadena de suministro, identificar los modelos de caos y complejidad y posteriormente determinar cuáles de éstos son aplicables al sector. Se define el caos como una sub-disciplina de las matemáticas que estudia sistemas compl...

APLICACIONES FOLIARES DE NITRATO DE CALCIO EN LA MADURACIÓN Y DAÑOS POR FRÍO EN AGUACATE 'FUERTE'

Directory of Open Access Journals (Sweden)

L. Saucedo-Hernández

2005-01-01

Full Text Available Con la finalidad de estudiar el efecto del calcio sobre la poscosecha de frutos de aguacate, árboles del cv. 'Fuerte' se asperjaron con Ca(NO32 al 0, 0.3 y 0.5 %. Se realizaron seis aplicaciones precosecha a partir del 4 de mayo del 2001, la cosecha se realizó en enero del 2002, una vez cosechados los frutos se almacenaron a temperatura ambiente y a 5 °C por cinco semanas, realizando evaluaciones a las 0, 3 y 5 semanas. Los resultados obtenidos indicaron que existió un incremento en el contenido de calcio en cáscara y pulpa en los frutos de aguacate tratados con nitrato de calcio. Las aplicaciones precosecha de nitrato de calcio al 0.3 y 0.5 % mejoraron la firmeza y redujeron la pérdida de peso de los frutos siendo diferentes al testigo, así también diminuyó la producción de CO2, etileno y daños por frío.

X-shooter: UV-to-IR intermediate-resolution high-efficiency spectrograph for the ESO VLT

NARCIS (Netherlands)

D'Odorico, S.; Andersen, M.I.; Conconi, P.; De Caprio, V.; Delabre, B.; Di Marcantonio, P.; Dekker, H.; Downing, M.D.; Finger, G.; Groot, P.; Hanenburg, H.H.; Hammer, F.; Horville, D.; Hjorth, J.; Kaper, L.; Klougart, J.; Kjaergaard-Rasmussen, P.; Lizon, J.-L.; Marteaud, M.; Mazzoleni, R.; Michaelsen, N.; Pallavicini, R.; Rigal, F.; Santin, P.; Norup Soerensen, A.; Spano, P.; Venema, L.; Vola, P.; Zerbi, F.M.; Hasinger, G.; Turner, M.J.L.

2004-01-01

X-shooter is a single target spectrograph for the Cassegrain focus of one of the VLT UTs. It covers in a single exposure the spectral range from the UV to the H band with a possible extension into part of the K band. It is designed to maximize the sensitivity in this spectral range through the

Volume phase holographic gratings for the Subaru Prime Focus Spectrograph: performance measurements of the prototype grating set

Science.gov (United States)

Barkhouser, Robert H.; Arns, James; Gunn, James E.

2014-08-01

The Prime Focus Spectrograph (PFS) is a major instrument under development for the 8.2 m Subaru telescope on Mauna Kea. Four identical, fixed spectrograph modules are located in a room above one Nasmyth focus. A 55 m fiber optic cable feeds light into the spectrographs from a robotic fiber positioner mounted at the telescope prime focus, behind the wide field corrector developed for Hyper Suprime-Cam. The positioner contains 2400 fibers and covers a 1.3 degree hexagonal field of view. Each spectrograph module will be capable of simultaneously acquiring 600 spectra. The spectrograph optical design consists of a Schmidt collimator, two dichroic beamsplitters to separate the light into three channels, and for each channel a volume phase holographic (VPH) grating and a dual- corrector, modified Schmidt reimaging camera. This design provides a 275 mm collimated beam diameter, wide simultaneous wavelength coverage from 380 nm to 1.26 µm, and good imaging performance at the fast f/1.1 focal ratio required from the cameras to avoid oversampling the fibers. The three channels are designated as the blue, red, and near-infrared (NIR), and cover the bandpasses 380-650 nm (blue), 630-970 nm (red), and 0.94-1.26 µm (NIR). A mosaic of two Hamamatsu 2k×4k, 15 µm pixel CCDs records the spectra in the blue and red channels, while the NIR channel employs a 4k×4k, substrate-removed HAWAII-4RG array from Teledyne, with 15 µm pixels and a 1.7 µm wavelength cutoff. VPH gratings have become the dispersing element of choice for moderate-resolution astronomical spectro- graphs due their potential for very high diffraction efficiency, low scattered light, and the more compact instru- ment designs offered by transmissive dispersers. High quality VPH gratings are now routinely being produced in the sizes required for instruments on large telescopes. These factors made VPH gratings an obvious choice for PFS. In order to reduce risk to the project, as well as fully exploit the performance

Aplicaciones del GRC en España y Argelia

Directory of Open Access Journals (Sweden)

Rodríguez Santiago, Jesús

1986-09-01

Full Text Available Not Available.Este artículo resume la experiencia obtenida en la utilización del mortero de cemento reforzado con fibra de vidrio (GRC en el campo de la construcción. Se describen en primer lugar las características del material y el proceso de fabricación en factoría de paneles de GRC. Se exponen a continuación algunas realizaciones llevadas a cabo con este material destacando, por su volumen y rapidez de ejecución, el conjunto de fachadas para edificios de viviendas, hospitales y centros escolares construidos en Argelia. También se comentan otras aplicaciones del GRC para la rehabilitación y decoración interior de edificios y para la construcción de elementos singulares. Finalmente, en el apartado de las conclusiones se menciona la necesidad de seguir investigando en el comportamiento a largo plazo de este material para poder aumentar su utilización en la construcción.

X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope

DEFF Research Database (Denmark)

Vernet, J.; Dekker, H.; D'Odorico, S.

2011-01-01

X-shooter is the first 2nd generation instrument of the ESO Very Large Telescope (VLT). It is a very efficient, single-target, intermediate-resolution spectrograph that was installed at the Cassegrain focus of UT2 in 2009. The instrument covers, in a single exposure, the spectral range from 300 t...

X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope

NARCIS (Netherlands)

Vernet, J.; Dekker, H.; D'Odorico, S.; Kaper, L.; Kjaergaard, P.; Hammer, F.; Randich, S.; Zerbi, F.; Groot, P.J.; Hjorth, J.; Guinouard, I.; Navarro, R.; Adolfse, T.; Albers, P.W.; Amans, J.-P.; Andersen, J.J.; Andersen, M.I.; Binetruy, P.; Bristow, P.; Castillo, R.; Chemla, F.; Christensen, L.; Conconi, P.; Conzelmann, R.; Dam, J.; De Caprio, V.; de Ugarte Postigo, A.; Delabre, B.; Di Marcantonio, P.; Downing, M.; Elswijk, E.; Finger, G.; Fischer, G.; Flores, H.; François, P.; Goldoni, P.; Guglielmi, L.; Haigron, R.; Hanenburg, H.; Hendriks, I.; Horrobin, M.; Horville, D.; Jessen, N.C.; Kerber, F.; Kern, L.; Kiekebusch, M.; Kleszcz, P.; Klougart, J.; Kragt, J.; Larsen, H.H.; Lizon, J.-L.; Lucuix, C.; Mainieri, V.; Manuputy, R.; Martayan, C.; Mason, E.; Mazzoleni, R.; Michaelsen, N.; Modigliani, A.; Moehler, S.; Møller, P.; Norup Sørensen, A.; Nørregaard, P.; Péroux, C.; Patat, F.; Pena, E.; Pragt, J.; Reinero, C.; Rigal, F.; Riva, M.; Roelfsema, R.; Royer, F.; Sacco, G.; Santin, P.; Schoenmaker, T.; Spano, P.; Sweers, E.; ter Horst, R.; Tintori, M.; Tromp, N.; van Dael, P.; van Vliet, H.; Venema, L.; Vidali, M.; Vinther, J.; Vola, P.; Winters, R.; Wistisen, D.; Wulterkens, G.; Zacchei, A.

2011-01-01

X-shooter is the first 2nd generation instrument of the ESO Very Large Telescope (VLT). It is a very efficient, single-target, intermediate-resolution spectrograph that was installed at the Cassegrain focus of UT2 in 2009. The instrument covers, in a single exposure, the spectral range from 300 to

Spectrographic determination of dysprosium dopant in calcium sulphate used as dosimetric material

International Nuclear Information System (INIS)

Grigoletto, T.

1982-01-01

A spectrographic method is described for the quantitative determination of dysprosium in doped crystals of calcium sulphate. The consequences of the changes in some parameters of the excitation conditions, such as arc current, electrode type and total or partial burning of sample, in the analytical results are discussed. Matrix effects are investigated by comparison among analytical curves obtained from three different methods of standard preparations. Variations in the intensity of the spectral lines are verificated by recording the spectrum in distinct photographic plates (SA-1). The role of internal standard in analytical reproducibility and in counterbalance of the variations in the arc current and in the weight of sample are studied. The great similarity in excitation behavior of many of the rare earths is used to provide a high degree of internal standardization. Precision studies show a standard deviation of about + - 2,4 percent by use of lanthanum as an internal standard. Accuracy is estimate by comparative analysis of two calcium sulphate samples by X-Rays Fluorescence, Neutron Activation and Inductive Coupled Plasma (ICP) Emission Spectroscopy. (Author) [pt

Materiales nanocompuestos de polipropileno y nitruros de carbono, procedimiento para su obtención y aplicaciones

OpenAIRE

Naffakh, Mohammed; Zamora Abanades, Felix; López Fernández, Vicente; Gómez Rodríguez, Mª Ángeles

2009-01-01

Materiales nanocompuestos de polipropileno y nitruros de carbono, procedimiento para su obtención y aplicaciones. La presente invención se refiere a un material nanocompuesto que comprende una matriz polimérica de polipropileno y nanopartículas de nitruro de carbono, con forma esférica o elipsoidal, a su procedimiento de obtención y a sus usos en la fabricación de artículos termoplásticos, ultraligeros y ultraduros.

Aplicaciones Móviles: Mejorar la imagen corporativa de los aeropuertos y diferenciarlos ante la competencia

OpenAIRE

Florido-Benítez, Lázaro

2017-01-01

La imagen que proyectan los aeropuertos a través de sus apps afectan directa e indirectamente en la satisfacción del pasajero. Hoy día los aeropuertos compiten entre si para captar un mayor números de aerolíneas y pasajeros, con el objetivo de incrementar sus ingresos comerciales. Las aplicaciones aeroportuarias como herramienta de marketing están ofreciendo un abanico de oportunidades al binomio pasajero y aeropuerto. Si los aeropuertos quieren mejorar la experiencia del pasajero y diferenci...

Materiales piezoeléctricos: formas de presentación ventajas y desventajas en las aplicaciones

OpenAIRE

Jiménez, B.

1995-01-01

El enorme desarrollo que han experimentado las aplicaciones de los materiales piezoeléctricos en las nuevas tecnologías se ha debido, fundamentalmente, al descubrimiento de las propiedades ferroeléctricas en los materiales con estructura tipo perovskita de composiciones basadas en el Titanato de Plomo. La posibilidad de preparar soluciones sólidas en forma cerámica y más recientemente el polímero PVDF y los materiales compuestos por una fase activa piezoeléctrica y otra fase no activa , "comp...

Determination of rare earth impurities in thorium by spectrographic methods

Energy Technology Data Exchange (ETDEWEB)

Wray, L W

1957-08-15

A method for determining rare earth impurities in thorium in the fractional ppm range is described. Before spectrographic examination is possible, the impurities must be freed from the thorium matrix. This is accomplished by removing the bulk of the thorium by extraction with TBP-CCl{sub 4} and the remainder by extraction with TTA-C{sub 6}H{sub 6}. This results in a consistent recovery of rare earths of about 85% with an average sensitivity of 0.2 ppm. The experimental error is within 10%. Details of the procedure are given together with working curves for the major neutron absorbing rare earths; i.e. dysprosium, europium, gadolinium and samarium. (author)

Substation automation. Integration of applications of the SICLE; Automatizacion de subestaciones. Integracion de aplicaciones sobre el SICLE

Energy Technology Data Exchange (ETDEWEB)

Gutierrez, Gustavo; Vega, Miguel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1997-12-31

This paper presents the first applications developed by the Instituto de Investigaciones Electricas (IIE) on the infrastructure of the SICLE (Sistema de Informacion y Control Local de la Estacion) (Station Information and Local Control System), that Comision Federal de Electricidad (CFE) is now acquiring in order to automate its transmission substations. A computer infrastructure was obtained similar to the existing in the substation for the development of program testing at the IIE; the personnel of the same was trained; the applications in conjunction with the CFE specialists were defined; the agreed developments were made and installed at the Temascal II Substation. [Espanol] En el presente articulo se presentan las primeras aplicaciones desarrolladas por el Instituto de Investigaciones Electricas (IIE) sobre la infraestructura del SICLE (Sistema de Informacion y Control Local de Estacion) que esta adquiriendo la Comision Federal de Electricidad (CFE) a fin de automatizar sus subestaciones de transmision. Se obtuvo una infraestructura de computo similar a la existente en la subestacion para el desarrollo de prueba de programas en el IIE; se capacito al personal en la misma; se definieron las aplicaciones conjuntamente con los especialistas de la CFE; se hicieron los desarrollos acordados y se instalaron en la subestacion Temascal II.

Substation automation. Integration of applications of the SICLE; Automatizacion de subestaciones. Integracion de aplicaciones sobre el SICLE

Energy Technology Data Exchange (ETDEWEB)

Gutierrez, Gustavo; Vega, Miguel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1998-12-31

This paper presents the first applications developed by the Instituto de Investigaciones Electricas (IIE) on the infrastructure of the SICLE (Sistema de Informacion y Control Local de la Estacion) (Station Information and Local Control System), that Comision Federal de Electricidad (CFE) is now acquiring in order to automate its transmission substations. A computer infrastructure was obtained similar to the existing in the substation for the development of program testing at the IIE; the personnel of the same was trained; the applications in conjunction with the CFE specialists were defined; the agreed developments were made and installed at the Temascal II Substation. [Espanol] En el presente articulo se presentan las primeras aplicaciones desarrolladas por el Instituto de Investigaciones Electricas (IIE) sobre la infraestructura del SICLE (Sistema de Informacion y Control Local de Estacion) que esta adquiriendo la Comision Federal de Electricidad (CFE) a fin de automatizar sus subestaciones de transmision. Se obtuvo una infraestructura de computo similar a la existente en la subestacion para el desarrollo de prueba de programas en el IIE; se capacito al personal en la misma; se definieron las aplicaciones conjuntamente con los especialistas de la CFE; se hicieron los desarrollos acordados y se instalaron en la subestacion Temascal II.

Development of infrared Echelle spectrograph and mid-infrared heterodyne spectrometer on a small telescope at Haleakala, Hawaii for planetary observation

Science.gov (United States)

Sakanoi, Takeshi; Kasaba, Yasumasa; Kagitani, Masato; Nakagawa, Hiromu; Kuhn, Jeff; Okano, Shoichi

2014-08-01

We report the development of infrared Echelle spectrograph covering 1 - 4 micron and mid-infrared heterodyne spectrometer around 10 micron installed on the 60-cm telescope at the summit of Haleakala, Hawaii (alt.=3000m). It is essential to carry out continuous measurement of planetary atmosphere, such as the Jovian infrared aurora and the volcanoes on Jovian satellite Io, to understand its time and spatial variations. A compact and easy-to-use high resolution infrared spectrometer provide the good opportunity to investigate these objects continuously. We are developing an Echelle spectrograph called ESPRIT: Echelle Spectrograph for Planetary Research In Tohoku university. The main target of ESPRIT is to measure the Jovian H3+ fundamental line at 3.9 micron, and H2 nu=1 at 2.1 micron. The 256x256 pixel CRC463 InSb array is used. An appropriate Echelle grating is selected to optimize at 3.9 micron and 2.1 micron for the Jovian infrared auroral observations. The pixel scale corresponds to the atmospheric seeing (0.3 arcsec/pixel). This spectrograph is characterized by a long slit field-of-view of ~ 50 arcsec with a spectral resolution is over 20,000. In addition, we recently developed a heterodyne spectrometer called MILAHI on the 60 cm telescope. MILAHI is characterized by super high-resolving power (more than 1,500,000) covering from 7 - 13 microns. Its sensitivity is 2400 K at 9.6 micron with a MCT photo diode detector of which bandwidth of 3000 MHz. ESPRIT and MILAHI is planned to be installed on 60 cm telescope is planned in 2014.

Metodología de modelado de aplicaciones web móviles basada en componentes

OpenAIRE

Vera, Pablo Martín; Pons, Claudia; González González, Carina Soledad; Giulianelli, Daniel Alberto; Rodríguez, Rocío Andrea

2013-01-01

Esta línea de investigación busca crear una metodología de modelado utilizando una extensión conservativa de UML (Lenguaje Unificado de Modelado) que permita diseñar aplicaciones web móviles centrándose en el modelado de la interfaz de usuario mediante la utilización de componente configurables. El objetivo final es la generación automática del código fuente completo de la aplicación. Para lograr tal fin se extienden los diagramas de clases y componentes de UML. El diagrama de clases es exten...

Los costos de la calidad: conceptos y aplicaciones en la industria farmacéutica

OpenAIRE

Enrique Yacuzzi; Fernando Martín

2003-01-01

Este documento de trabajo es una introducción práctica al estudio de los costos de la calidad (CC). En las primeras secciones se describen algunos métodos y aplicaciones sencillas. Utilizando ejemplos de la implantación de un sistema de CC en el área de acondicionamiento de un laboratorio farmacéutico multinacional que opera en la Argentina, se presentan definiciones y cálculos de costos, con ejemplos de los informes y planillas más comunes. Se estudia la clasificación de los costos y se brin...

La web, las aplicaciones de las Matemáticas y las metodologías activas: Una propuesta para el aula

Directory of Open Access Journals (Sweden)

María José Pérez Peñalver

2013-04-01

Full Text Available Con el objetivo de implicar a los estudiantes en su aprendizaje y de que relacionen los contenidos que se imparten en las clases de matemáticas, se ha creado una pequeña práctica de aula en primero de Ingeniería Civil de la Universidad Politécnica de Valencia. En la tarea, los estudiantes investigan en grupo las aplicaciones de las cónicas y las cuádricas a través de la red. Posteriormente eligen varias aplicaciones y elaboran una pequeña presentación que comparten con el resto de grupos. Finalmente realizan la evaluación de la tarea, que ha sido una responsabilidad compartida entre el profesor y los grupos y se ha organizado en forma de concurso con un premio para el mejor. En el artículo se muestra la descripción detallada del proceso, los resultados obtenidos, el grado de satisfacción de los alumnos y del docente, los problemas que surgieron y las propuestas de mejora.

The infrared imaging spectrograph (IRIS) for TMT: volume phase holographic grating performance testing and discussion

Science.gov (United States)

Chen, Shaojie; Meyer, Elliot; Wright, Shelley A.; Moore, Anna M.; Larkin, James E.; Maire, Jerome; Mieda, Etsuko; Simard, Luc

2014-07-01

Maximizing the grating efficiency is a key goal for the first light instrument IRIS (Infrared Imaging Spectrograph) currently being designed to sample the diffraction limit of the TMT (Thirty Meter Telescope). Volume Phase Holographic (VPH) gratings have been shown to offer extremely high efficiencies that approach 100% for high line frequencies (i.e., 600 to 6000l/mm), which has been applicable for astronomical optical spectrographs. However, VPH gratings have been less exploited in the near-infrared, particularly for gratings that have lower line frequencies. Given their potential to offer high throughputs and low scattered light, VPH gratings are being explored for IRIS as a potential dispersing element in the spectrograph. Our team has procured near-infrared gratings from two separate vendors. We have two gratings with the specifications needed for IRIS current design: 1.51-1.82μm (H-band) to produce a spectral resolution of 4000 and 1.19-1.37μm (J-band) to produce a spectral resolution of 8000. The center wavelengths for each grating are 1.629μm and 1.27μm, and the groove densities are 177l/mm and 440l/mm for H-band R=4000 and J-band R=8000, respectively. We directly measure the efficiencies in the lab and find that the peak efficiencies of these two types of gratings are quite good with a peak efficiency of ~88% at the Bragg angle in both TM and TE modes at H-band, and 90.23% in TM mode, 79.91% in TE mode at J-band for the best vendor. We determine the drop in efficiency off the Bragg angle, with a 20-23% decrease in efficiency at H-band when 2.5° deviation from the Bragg angle, and 25%-28% decrease at J-band when 5° deviation from the Bragg angle.

Desarrollo de materiales poliméricos nanocompuestos para aplicaciones eléctricas y electrónicas

OpenAIRE

Chinè, Bruno

2007-01-01

Se reportan algunos resultados y procedimientos experimentales de laboratorio obtenidos en el marco de investigaciones desarrolladas para la obtención de nuevos materiales compuestosnanoestructurados. Estos nuevos materiales, formados por una fase orgánica el polímero y una fase inorgánica el silicato, están siendo fuertemente investigados en la actualidad pues se espera que puedan brindar, entre otras, mejores propiedades de aislamiento eléctrico y de retardo a la flama en aplicaciones eléct...

APLICACION DE TECNICAS DE INGENIERIA METABOLICA AL MEJORAMIENTO DE LA PRODUCCION DE TREHALOSA POR CORYNEBACTERIUM GLUTAMICUM.

OpenAIRE

PADILLA IGLESIAS, LEANDRO MAURICIO

2004-01-01

La Trehalosa es un disacárido con tremendas aplicaciones en la industria biotecnológica y alimenticia. Este compuesto se encuentra en muchos organismos, a causa de su capacidad de proteger las células contra el calor y la deshidratación. Un ejemplo, es la bacteria Gram-positiva Corynebacterium glutamicum, la cual sintetiza trehalosa a través de dos rutas principales, TreYZ y OtsBA, usando ADP-glucosa (especulativamente) y UDP-glucosa, respectivamente, como dadores de unidades de ...

Adolescentes y cibermedios: Una didáctica basada en aplicaciones periodísticas para smartphones

OpenAIRE

Vázquez-Cano, Esteban; Calvo-Gutiérrez, Elvira

2015-01-01

La investigación analiza el uso por parte del alumnado y profesorado de enseñanza secundaria de aplicaciones periodísticas en smartphones para el desarrollo curricular de las diferentes materias. Presentamos un estudio de casos en el que, por medio de una investigación de corte cuantitativo, se estudian las variables principales que afectan al desarrollo didáctico y social de los smartphones en la enseñanza desde una perspectiva sociodidáctica e informativa. Los resultados muestran cómo la es...

Arquitectura de software basada en microservicios para desarrollo de aplicaciones web de la Asamblea Nacional

OpenAIRE

López Hinojosa, José Daniel

2017-01-01

Proponer una arquitectura de software basada en microservicios para el desarrollo de aplicaciones web en la Coordinación General de Tecnologías de la Información y Comunicación de la Asamblea Nacional del Ecuador. Actualmente, el proceso de desarrollo de software que realiza la Coordinación General de Tecnologías de la Información y Comunicación (CGTIC) de la Asamblea Nacional del Ecuador (ANE) constituye el empleo de una arquitectura de software tradicional o monolítica que ha sido ...

Generación automática de aplicaciones web móviles mediante componentes configurables

OpenAIRE

Vera, Pablo Martín; Pons, Claudia; González, Carina; Rodríguez, Rocío Andrea; Giulianelli, Daniel Alberto

2014-01-01

Teniendo como objetivo final la generación completa del código fuente de una aplicación, se ha desarrollado CBDHM (Metodología de Modelado Hipermedia Basada en Componentes). Esta metodología está basada en UML (Lenguaje Unificado de Modelado) y permite diseñar y construir aplicaciones web móviles utilizando dos modelos: el modelo de datos y el modelo de interfaz de usuario. El modelo de datos está basado en el diagrama de clases UML extendido para poder generar la base de datos y sus relacion...

Del telegrama a los tweets: investigación sobre la interacción del adulto mayor con las redes sociales y aplicaciones Google considerando aspectos de usabilidad y accesibilidad web

OpenAIRE

Díaz, Francisco Javier; Harari, Ivana

2015-01-01

En este artículo se presenta el estado de avance de la tesina “Del Telegrama a los Tweets: Investigación sobre la Interacción del Adulto Mayor con las Redes Sociales y Aplicaciones Google, considerando Aspectos de Usabilidad y Accesibilidad Web” para el magister de Redes de Datos de la Fac.de Informática de la Universidad Nacional de La Plata. La misma consiste en una investigación integral sobre la interacción entre los adultos mayores y las aplicaciones de Web 2.0 actuales como Facebook y T...

SpecOp: Optimal Extraction Software for Integral Field Unit Spectrographs

Science.gov (United States)

McCarron, Adam; Ciardullo, Robin; Eracleous, Michael

2018-01-01

The Hobby-Eberly Telescope’s new low resolution integral field spectrographs, LRS2-B and LRS2-R, each cover a 12”x6” area on the sky with 280 fibers and generate spectra with resolutions between R=1100 and R=1900. To extract 1-D spectra from the instrument’s 3D data cubes, a program is needed that is flexible enough to work for a wide variety of targets, including continuum point sources, emission line sources, and compact sources embedded in complex backgrounds. We therefore introduce SpecOp, a user-friendly python program for optimally extracting spectra from integral-field unit spectrographs. As input, SpecOp takes a sky-subtracted data cube consisting of images at each wavelength increment set by the instrument’s spectral resolution, and an error file for each count measurement. All of these files are generated by the current LRS2 reduction pipeline. The program then collapses the cube in the image plane using the optimal extraction algorithm detailed by Keith Horne (1986). The various user-selected options include the fraction of the total signal enclosed in a contour-defined region, the wavelength range to analyze, and the precision of the spatial profile calculation. SpecOp can output the weighted counts and errors at each wavelength in various table formats using python’s astropy package. We outline the algorithm used for extraction and explain how the software can be used to easily obtain high-quality 1-D spectra. We demonstrate the utility of the program by applying it to spectra of a variety of quasars and AGNs. In some of these targets, we extract the spectrum of a nuclear point source that is superposed on a spatially extended galaxy.

CRITERIOS PARA LA EVALUACIÓN DE SUPERFICIES MULTITÁCTILES Y SUS APLICACIONES

Directory of Open Access Journals (Sweden)

YENNY A. MÉNDEZ

2012-06-01

Full Text Available Las superficies multitáctiles son tecnologías que empiezan a tener un elevado uso. Se toman como referentes aspectos utilizados para la evaluación de usabilidad de sistemas interactivos, así como las característicasque los investigadores y desarrolladores sugieren que deberían tener las superficies multitáctiles y las aplicaciones desarrolladas. Se presenta una propuesta inicial de criterios que deberían tenerse en cuenta para incluir  aspectos de ergonomía, usabilidad y colaboración en el momento de realizar evaluaciones para estas tecnologías. Se ilustra cómo se pueden aplicar los criterios propuestos a través de un caso de estudio que cuenta con resultados promisorios.

The vacuum system of the Karlsruhe magnetic spectrograph 'Little John'

International Nuclear Information System (INIS)

Buschmann, J.; Gils, H.J.; Jelitto, H.; Krisch, J.; Ludwig, G.; Manger, D.; Rebel, H.; Seith, W.; Zagromski, S.

1985-02-01

The vacuum equipment of the magnetic spectrograph Little John is described. The system is characterized by the following special features: The sliding exit flange of the target chamber can be moved to the desired angle of observation without affecting the high vacuum. The pressure maintained is less by a factor of ten than the pressure in the incoming beam tubing. The vacuum system is divided into several separate pumping sections. Ground loops are strictly avoided. All actual states of relevance are fed back to the control panels. The vacuum installation is protected by hardware interlocking systems as well as by a real time program written in FORTRAN in cooperation with CAMAC interfacing. (orig.) [de

Codificación de red y sus aplicaciones

Directory of Open Access Journals (Sweden)

Francisco de Asís López Fuentes

2014-01-01

Full Text Available Este documento presenta una revisión general de una nueva técnica en el campo de la teoría de la información, llamada “codificación de red”. La codificación de red se presenta como una técnica prometedora y de activa investigación en la teoría de redes. Diversos beneficios relacionados al flujo de información, tales como un óptimo aprovechamiento del ancho de banda y la reducción de retardos en redes de extremo a extremo han sido reportados en la literatura. Nuestro trabajo en este documento se enfoca principalmente a los siguientes aspectos de codificación de red: planteamiento del modelo, áreas de aplicación y beneficios obtenidos al usar esta técnica. Los aspectos discutidos en este trabajo cubren tanto a las redes fijas como móviles. El objetivo de este artículo es mostrar al lector la relevancia y potencial de esta técnica y las aplicaciones que se están desarrollando a su alrededor.

Use of gamma spectroscopy in activation analysis; Utilisation de la spectrographie gamma dans l'analyse par activation

Energy Technology Data Exchange (ETDEWEB)

Leveque, [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

1959-07-01

Brief review of the principles of activation analysis: calculation of activities, decay curves, {beta} absorption curves, examples of application. - Principle and description of the {gamma} spectrograph. - Practical utilisation of the {gamma} spectrograph: analysis by activation, analysis by {beta} - x fluorescence. - Sensitivity limit of the method and precision of the measurements. - Possible improvements to the method: {gamma} spectroscopy with elimination of the Compton effect. (author) [French] Bref rappel des principes de l'analyse par activation: calcul des activites, courbes de decroissance, courbes d'absorption {beta}, exemples d'utilisation. - Principe et description du spectrographe {gamma}. - Utilisation pratique de la spectrographie {gamma}: analyse par activation, analyse par fluorescence {beta} - x. - Limite de sensibilite de la methode et precision des mesures. - Ameliorations possibles de la methode: spectrographe {gamma} avec elimination de l'effet Compton. (auteur)

Energy saving in hotels by means of heat pumps application; Ahorro de energia en hoteles mediante la aplicacion de bombas de calor

Energy Technology Data Exchange (ETDEWEB)

Romero Paredes R, Hernando; Ambriz G, Juan Jose [Universidad Autonoma Metropolitana, Unidad Iztapalapa (Mexico)

2005-07-15

The thermal energy is presented as an alternate saving technology for utilities by means of the acute implementation of heat pumps. The objective is to demonstrate the technical and economical feasibility of the application of commercial heat pumps to installations where the handling of opposite temperatures for the conditioning of a space and/or of a fluid is required. In this article it is described the functioning of a heat pump, its different operation principles or types as well as the large diversity of applications they can have in industry, utilities and residential buildings. As an application example the substitution of an electric boiler by a heat pump is presented in a hotel installation and its differences in performance regarding the environmental conditioning of a nearby area and the heating of swimming pool water are analyzed. [Spanish] Se presenta la energia termica como una tecnologia de ahorro alterna para empresas de servicios valiendose de la implementacion agudizada de bombas de calor. El objetivo es demostrar la factibilidad tecnica y economica de la aplicacion de bombas de calor comerciales a instalaciones donde se requiere la manipulacion de temperaturas opuestas para el acondicionamiento de un espacio y/o un fluido. Se describe el funcionamiento de una bomba de calor, sus diferentes principios de operacion o tipos, asi como la gran diversidad de aplicaciones que pueden tener en la industria, empresas de servicios y edificios residenciales. Como ejemplo de aplicacion se presenta la sustitucion de una caldera electrica por una bomba de calor en una instalacion hotelera y sus diferencias de rendimiento en el calentamiento de agua de alberca y el acondicionamiento ambiental de un area cercana.

The Development of Replicated Optical Integral Field Spectrographs and their Application to the Study of Lyman-alpha Emission at Moderate Redshifts

Science.gov (United States)

Chonis, Taylor Steven

In the upcoming era of extremely large ground-based astronomical telescopes, the design of wide-field spectroscopic survey instrumentation has become increasingly complex due to the linear growth of instrument pupil size with telescope diameter for a constant spectral resolving power. The upcoming Visible Integral field Replicable Unit Spectrograph (VIRUS), a baseline array of 150 copies of a simple integral field spectrograph that will be fed by 3:36 x 104 optical fibers on the upgraded Hobby-Eberly Telescope (HET) at McDonald Observatory, represents one of the first uses of large-scale replication to break the relationship between instrument pupil size and telescope diameter. By dividing the telescope's field of view between a large number of smaller and more manageable instruments, the total information grasp of a traditional monolithic survey spectrograph can be achieved at a fraction of the cost and engineering complexity. To highlight the power of this method, VIRUS will execute the HET Dark Energy Experiment (HETDEX) and survey & 420 degrees2 of sky to an emission line flux limit of ˜ 10-17 erg s-1 cm -2 to detect ˜ 106 Lyman-alpha emitting galaxies (LAEs) as probes of large-scale structure at redshifts of 1:9 production of the suite of volume phase holographic (VPH) diffraction gratings for VIRUS is presented, which highlights the challenge and success associated with producing of a very large number of highly customized optical elements whose performance is crucial to meeting the efficiency requirements of the spectrograph system. To accommodate VIRUS, the HET is undergoing a substantial wide-field upgrade to increase its field of view to 22' in diameter. The previous HET facility Low Resolution Spectrograph (LRS), which was directly fed by the telescope's previous spherical aberration corrector, must be removed from the prime focus instrument package as a result of the telescope upgrades and instead be fiber-coupled to the telescope focal plane. For a

COSMIC ORIGINS SPECTROGRAPH OBSERVATIONS OF TRANSLUCENT CLOUDS: Cyg OB2 8A

International Nuclear Information System (INIS)

Snow, Theodore P.; Destree, Joshua D.; Burgh, Eric B.; Ferguson, Ryan M.; Danforth, Charles W.; Cordiner, Martin

2010-01-01

Data from the Cosmic Origins Spectrograph (COS) are presented for the first highly reddened target (Cyg OB2 8A) under the COS Science Team's guaranteed time allocation. Column densities of ionic, atomic, and molecular species are reported and implications are discussed. Data from Cyg OB2 8A demonstrate the ability to analyze highly reddened interstellar sight lines with the COS that were unavailable to previous UV instruments. Measured column densities indicate that the Cyg OB2 8A line of sight contains multiple diffuse clouds rather than a dominant translucent cloud.

Absolute calibration of a SPRED [Spectrometer Recording Extended Domain] EUV [extreme ultraviolet] spectrograph for use on the DIII-D tokamak

International Nuclear Information System (INIS)

Wood, R.D.; Allen, S.L.

1988-01-01

We have performed an absolute intensity calibration of a SPRED multichannel EUV spectrograph using synchrotron radiation from the NBS SURF-II electron storage ring. The calibration procedure and results for both a survey grating (450 g/mm) and a high-resolution (2100 g/mm) grating are presented. The spectrograph is currently in use on the DIII-D tokamak with a tangential line-of-sight at the plasma midplane. Data is first acquired and processed by a microcomputer; the absolute line intensities are then sent to the DIII-D database for comparison with data from other diagnostics. Representative data from DIII-D plasma operations will be presented. 6 refs., 3 figs., 1 tab

Optical Design of the far Ultraviolet Imaging Spectrograph

Directory of Open Access Journals (Sweden)

K. S. Ryu

1998-12-01

Full Text Available We present the design specifications and the performance estimation of the FUVS (Far Ultraviolet Spectrograph proposed for the observations of aurora, day/night airglow and astronomical objects on small satelltes in the spectral range of . The design of FUVS is carried out with the full consideration of optical characteristics of the grating and the aspheric substrate. Two independent methods, ray-tracing and the wave front aberration theory, are employed to estimate the performance of the optical design and it is verified that both procedures yield the resolution of in the entire spectral range. MDF (Minimum Detectable Flux is also estimated using the known characteristics of the reflecting material and MCP, to study the feasibility of detection for faint emission lines from the hot interstellar plasmas. The results give that the observations from 1 day to 1 week, depending on the line intensity, can detect such faint emission lines from diffuse interstellar plasmas.

Tecnología Móvil: desarrollo de sistemas y aplicaciones para las Unidades de Información

Directory of Open Access Journals (Sweden)

Raúl Alberto Garita-Araya

2013-07-01

Full Text Available Las Unidades de Información han enfrentado cambios con el pasar de los años, lograron adaptarse, crecer y en la mayoría de los casos evolucionar. Algunas mejoran sus servicios, productos y llegan a una mayor cantidad y calidad de usuarios. Sin embargo, esta evolución no ha sido igual para todas, muchas se han quedado en el camino. La evolución ha sido provocada principalmente por los avances en la tecnología; los sistemas rígidos de administración y descripción bibliográfica deberían ser historia. En la actualidad, los sistemas son en ambiente web y permiten utilizar las herramientas, el almacenaje y acceso en la nube. Es necesario que las bibliotecas exploten las oportunidades que las tecnologías, herramientas y plataformas móviles proporcionan; accesos ilimitados, mayor captura de usuarios según sus intereses individuales o grupales. Las aplicaciones móviles son un mercado que las bibliotecas deben aprovechar, su desarrollo debe dejar de ser un obstáculo para los profesionales de la información. En el momento que las unidades de información desarrollen y personalicen sus propias herramientas y aplicaciones web, la brecha informacional de sus usuarios gradualmente desaparecerá, un desafío que vale la pena el esfuerzo.

Tecnología Móvil: desarrollo de sistemas y aplicaciones para las Unidades de Información

Directory of Open Access Journals (Sweden)

Raúl Alberto Garita-Araya

2013-01-01

Full Text Available Las Unidades de Información han enfrentado cambios con el pasar de los años, lograron adaptarse, crecer y en la mayoría de los casos evolucionar. Algunas mejoran sus servicios, productos y llegan a una mayor cantidad y calidad de usuarios. Sin embargo, esta evolución no ha sido igual para todas, muchas se han quedado en el camino. La evolución ha sido provocada principalmente por los avances en la tecnología; los sistemas rígidos de administración y descripción bibliográfica deberían ser historia. En la actualidad, los sistemas son en ambiente web y permiten utilizar las herramientas, el almacenaje y acceso en la nube. Es necesario que las bibliotecas exploten las oportunidades que las tecnologías, herramientas y plataformas móviles proporcionan; accesos ilimitados, mayor captura de usuarios según sus intereses individuales o grupales. Las aplicaciones móviles son un mercado que las bibliotecas deben aprovechar, su desarrollo debe dejar de ser un obstáculo para los profesionales de la información. En el momento en que las unidades de información desarrollen y personalicen sus propias herramientas y aplicaciones web, la brecha informacional de sus usuarios gradualmente desaparecerá, un desafío que vale la pena el esfuerzo.

Análisis de eficiencia en arquitecturas multiprocesador para aplicaciones de transmisión y procesamiento de datos

OpenAIRE

Osio, Jorge R.; Salvatore, Juan Eduardo; Kunysz, Eduardo; Guarepi, V. L.; Morales, Daniel Martín

2016-01-01

Los principales lineamientos de investigación de este proyecto se orientan a las Arquitecturas que posibilitan el procesamiento paralelo, principalmente en sistemas multi-core. Por otro lado, la optimización de estos sistemas se orienta a determinadas aplicaciones de telemedicina y de sistemas ópticos basados en MIOC , (Multifunction Integrated Optical Chip), que requieren procesamiento y transmisión de datos de forma remota. Paralelamente a estos lineamientos el proyecto contempla el e...

Cosmic Origins Spectrograph: On-Orbit Performance of Target Acquisitions

Science.gov (United States)

Penton, Steven V.

2010-07-01

COS is a slit-less spectrograph with a very small aperture (R=1.2500). To achieve the desired wavelength accuracies, HST+COS must center the target to within 0.100 of the center of the aperture for the FUV channel, and 0.0400 for NUV. During SMOV and early Cycle 17 we fine-tuned the COS target acquisition (TA) procedures to exceed this accuracy for all three COS TA modes; NUV imaging, NUV spectroscopic, and FUV spectroscopic. In Cycle 17, we also adjusted the COSto- FGS offsets in the SIAF file. This allows us to recommend skipping the time consuming ACQ/SEARCH in cases where the target coordinates are well known. Here we will compare the on-orbit performance of all COS TA modes in terms of centering accuracy, efficiency, and required signal-to-noise (S/N).

UNA INTERPRETACIÓN DE LA PSICOLOGÍA CULTURAL: APLICACIONES PRÁCTICAS Y PRINCIPIOS TEÓRICOS

OpenAIRE

Guitart, Moises Esteban

2011-01-01

En el siguiente trabajo se exponen las bases teóricas y se ilustran algunas aplicaciones de una visión de la psicología cultural alrededor del concepto de "vivencia" y "geografía vital". Según esta perspectiva, el desarrollo humano es el resultado de la participación en prácticas educativas a través de las cuales nos apropiamos de los "signos", "tecnología cultural" o formas explícitas e implícitas de vida compartida. Se postulan dos supuestos y tres características. Los supuestos son que la ...

Aplicaciones de normas no cuadráticas en tratamiento digital de la señal

OpenAIRE

Páez Borrallo, José Manuel

1987-01-01

La mayoría de los problemas de estimación están basados en la minimización de una función de coste cuadrática del error de estimación. Este criterio de calidad posee la propiedad de proporcionar el mejor y más sencillo estimador posible en un gran número de aplicaciones. Sin embalo, existen situaciones concretas donde la selección de funciones de costo más generales ofrecen similares o incluso mejores prestaciones que la minimización cuadrática. El presente trabajo introduce criterios de opti...

Plan de Auditoría del desarrollo de aplicaciones en una empresa informática

OpenAIRE

AGUILAR ESCOBÍ, MARÍA AMPARO

2012-01-01

El proceso de la auditoría requiere una gran recopilación de datos, realización de pruebas y comprobación de requisitos de control. En este trabajo pretendemos, primero mostrar una visión global de la auditoría para posteriormente centrarnos en la auditoría que nos interesa en este proyecto, la auditoría de los Sistemas de desarrollo de aplicaciones informáticas, explicaremos las características que tiene la organización a la que le vamos a realizar el plan de auditoría junt...

THE SPITZER INFRARED SPECTROGRAPH DEBRIS DISK CATALOG. I. CONTINUUM ANALYSIS OF UNRESOLVED TARGETS

Energy Technology Data Exchange (ETDEWEB)

Chen, Christine H. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Mittal, Tushar [Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA 94720-4767 (United States); Kuchner, Marc [NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory, Code 667, Greenbelt, MD 20771 (United States); Forrest, William J.; Watson, Dan M. [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627 (United States); Lisse, Carey M. [Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 (United States); Manoj, P. [Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 (India); Sargent, Benjamin A., E-mail: cchen@stsci.edu [Center for Imaging Science and Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, NY 14623 (United States)

2014-04-01

During the Spitzer Space Telescope cryogenic mission, Guaranteed Time Observers, Legacy Teams, and General Observers obtained Infrared Spectrograph (IRS) observations of hundreds of debris disk candidates. We calibrated the spectra of 571 candidates, including 64 new IRAS and Multiband Imaging Photometer for Spitzer (MIPS) debris disks candidates, modeled their stellar photospheres, and produced a catalog of excess spectra for unresolved debris disks. For 499 targets with IRS excess but without strong spectral features (and a subset of 420 targets with additional MIPS 70 μm observations), we modeled the IRS (and MIPS data) assuming that the dust thermal emission was well-described using either a one- or two-temperature blackbody model. We calculated the probability for each model and computed the average probability to select among models. We found that the spectral energy distributions for the majority of objects (∼66%) were better described using a two-temperature model with warm (T {sub gr} ∼ 100-500 K) and cold (T {sub gr} ∼ 50-150 K) dust populations analogous to zodiacal and Kuiper Belt dust, suggesting that planetary systems are common in debris disks and zodiacal dust is common around host stars with ages up to ∼1 Gyr. We found that younger stars generally have disks with larger fractional infrared luminosities and higher grain temperatures and that higher-mass stars have disks with higher grain temperatures. We show that the increasing distance of dust around debris disks is inconsistent with self-stirred disk models, expected if these systems possess planets at 30-150 AU. Finally, we illustrate how observations of debris disks may be used to constrain the radial dependence of material in the minimum mass solar nebula.

Electrodo biológico con la enzima hidrogenasa, procedimiento de obtención y sus aplicaciones

OpenAIRE

Fernández López, Víctor Manuel; López de Lacey, Antonio; Rüdiger Ortiz, Olaf

2005-01-01

Electrodo biológico con la enzima hidrogenasa, procedimiento de obtención y sus aplicaciones. En la presente invención se protegen electrodos biológicos modificados con enzimas hidrogenasas (ánodos) mediante los cuales es posible obtener energía eléctrica del hidrógeno en una configuración típica de pilas de combustible; asimismo, con estos electrodos modificados con hidrogenasa (cátodos) es posible producir hidrógeno a partir de agua en una configuración típica de cél...

Técnicas de fermentación y aplicaciones de la celulosa bacteriana: una revisión

OpenAIRE

Carreño Pineda, Luz Dary; Caicedo Mesa, Luis Alfonso; Martínez Riascos, Carlos Arturo

2012-01-01

La celulosa bacteriana es un polímero obtenido por fermentación con microrganismos de los géneros Acetobacter, Rhizobium, Agrobacterium y Sarcina, de las cuales la especie más eficiente es la Acetobacter Xylinum. Este polímero presenta la misma estructura química de la celulosa de origen vegetal, pero difiere en su conformación y propiedades fisicoquímicas, lo que lo hace atractivo para diversas aplicaciones, especialmente en las áreas de alimentos, procesos de separación, catálisis y en medi...

Aplicaciones, servicios y procesos distribuidos : Una visión para la construcción de software

OpenAIRE

Bazán, Patricia

2017-01-01

En los orígenes de la ciencia de la computación todo el énfasis estuvo puesto en desarrollar sistemas que automatizaran tareas que se hacían manualmente. Este era suficiente desafío. En la actualidad, se han automatizado muchas tareas y el gran desafío es cómo mejorar la capacidad de los sistemas para alcanzar nuevos requerimientos: agregar nuevas interfaces, combinar múltiples fuentes de datos en una sola, interactuar con dispositivos móviles y reemplazar viejas aplicaciones con nuevas. ...

Endo-β-1,4-glucanasa para la fabricación de micro/nanocelulosa: propiedades y aplicaciones

OpenAIRE

Tarrés Farrés, Joaquim Agustí

2017-01-01

En els darrers anys, entre la comunitat científica i tecnològica s’ha despertat un gran interès en la producció, caracterització i utilització de nanofibres de cel·lulosa. Aquesta especial atenció es deu, principalment, al seu caràcter biodegradable, el seu origen renovable i la versatilitat que presenten, fent-les aptes per ser utilitzades en multitud d’aplicacions. L’esclat d’aquesta temàtica de recerca va tenir lloc aproximadament deu anys enrere, doncs només cal observar el creixement exp...

THE SPITZER INFRARED SPECTROGRAPH DEBRIS DISK CATALOG. II. SILICATE FEATURE ANALYSIS OF UNRESOLVED TARGETS

Energy Technology Data Exchange (ETDEWEB)

Mittal, Tushar [Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA 94720-4767 (United States); Chen, Christine H. [Space Telescope Science Institute, 3700 San Martin Drive Baltimore, MD 21218 (United States); Jang-Condell, Hannah [Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States); Manoj, P. [Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 (India); Sargent, Benjamin A. [Center for Imaging Science and Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, NY 14623 (United States); Watson, Dan M. [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627 (United States); Lisse, Carey M., E-mail: cchen@stsci.edu [Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 (United States)

2015-01-10

During the Spitzer Space Telescope cryogenic mission, astronomers obtained Infrared Spectrograph (IRS) observations of hundreds of debris disk candidates that have been compiled in the Spitzer IRS Debris Disk Catalog. We have discovered 10 and/or 20 μm silicate emission features toward 120 targets in the catalog and modeled the IRS spectra of these sources, consistent with MIPS 70 μm observations, assuming that the grains are composed of silicates (olivine, pyroxene, forsterite, and enstatite) and are located either in a continuous disk with power-law size and surface density distributions or thin rings that are well-characterized using two separate dust grain temperatures. For systems better fit by the continuous disk model, we find that (1) the dust size distribution power-law index is consistent with that expected from a collisional cascade, q = 3.5-4.0, with a large number of values outside this range, and (2) the minimum grain size, a {sub min}, increases with stellar luminosity, L {sub *}, but the dependence of a {sub min} on L {sub *} is weaker than expected from radiation pressure alone. In addition, we also find that (3) the crystalline fraction of dust in debris disks evolves as a function of time with a large dispersion in crystalline fractions for stars of any particular stellar age or mass, (4) the disk inner edge is correlated with host star mass, and (5) there exists substantial variation in the properties of coeval disks in Sco-Cen, indicating that the observed variation is probably due to stochasticity and diversity in planet formation.

Applications of the renewable energies; Aplicaciones de las energias renovables

Energy Technology Data Exchange (ETDEWEB)

Gomez Rocha, Luis Martin [Comision Nacional para el Ahorro de Energia, Mexico, D.F. (Mexico)

2001-07-01

The solar energy manifests itself in different forms and its application has been fundamental for the humankind development. These forms are known as renewable energies, since they are energy forms that are renewed or remade with time or that are so abundant on Earth, that they will last for hundreds or thousands of years, either we use them or not. The main advantage of the utilization of the renewable energies in comparison with hydrocarbons is the one of having smaller impact on the environment, which brings about the conservation of nonrenewable resources, and to postpone its exhaustion. They allow the distributed generation, diminishing the power losses in the transmission and distribution systems, which increases the overall efficiency. In addition they can be the drive for regional development and generation of employment, because when having applications in remote zones and being a field still not completely developed in Mexico, the possibility exists of enabling professionals and technicians. From the point of view of the power sector, the renewable energies extend the supply and availability of energy, making more flexible and independent the operation and reliability of the national power system. [Spanish] La energia solar se manifiesta de diversas formas y su aplicacion ha sido fundamental para el desarrollo de la humanidad. A estas formas se les conoce como energias renovables, ya que son formas de energia que se van renovando o rehaciendo con el tiempo o que son tan abundantes en la tierra, que perduraran por cientos o miles de anos, las usemos o no. La principal ventaja del aprovechamiento de las energias renovables en comparacion con los hidrocarburos es la de tener menor impacto al medio ambiente, lo que trae consigo la conservacion de recursos no renovables, y posponer su termino. Permiten la generacion distribuida, disminuyendo las perdidas energeticas en los sistemas de transmision y distribucion, lo que incrementa la eficiencia general. Ademas

Top down viewing of the inductively coupled plasma using a dual grating, direct reading spectrograph and an all mirror optical system

International Nuclear Information System (INIS)

Apel, C.T.; Duchane, D.V.; Palmer, B.A.

1980-01-01

Using an all-mirror optical system, an inductively coupled plasma is viewed top down and the light is directed to a dual grating, direct reading spectrograph. Top down viewing of the plasma, with masking of the image of the argon plasma torus at the spectrograph entrance slit, significantly reduces background signal from the source and permits the use of the depth of field of the optical system to achieve compromise conditions for viewing the plasma. Light from the plasma source is introduced to the optical system by means of a mirror situated directly over the plasma. The system is exhausted in such a way that cool air flowing past the mirror forms a thermal barrier between the mirror and the plasma. Elements such as copper and lead have atomic and ionic lines which tend to exhibit self absorption when viewed top down through the cooler ground state atoms in the plume of the plasma. One of the approaches to this problem is to shear off the plume of the plasma with a jet of air directed across the tip of the plasma. A second approach is to make use of the dual grating, direct reading spectrograph and real-time computer system which easily permits the setting of alternate lines for each element so that self absorption and matrix effects are minimized. The design of the dual-grating, direct-reading spectrograph allows for the mounting of more than 200 13-mm-dia photomultiplier tubes along the focal curves. In an effort to demonstrate the use of fiber optics as a viable technique for the closer placement of exit slits, a red sensitive photomultiplier tube was coupled with a 30-cm fiber-optic ribbon to detect light from the Li 670.784 nm line on the focal curve. It was successful and had the added advantages of absorbing second-order ultraviolet light

Arquitecturas multiprocesador en computación de alto desempeño: software, métricas, modelos y aplicaciones

OpenAIRE

De Giusti, Armando Eduardo; Tinetti, Fernando Gustavo; Naiouf, Marcelo; Chichizola, Franco; De Giusti, Laura Cristina; Villagarcía Wanza, Horacio A.; Montezanti, Diego Miguel; Encinas, Diego; Pousa, Adrián; Rodriguez, Ismael Pablo; Rodriguez Eguren, Sebastián; Iglesias, Luciano; Paniego, Juan Manuel; Pi Puig, Martín; Dell'Oso, Matías

2017-01-01

Caracterizar las arquitecturas multiprocesador distribuidas enfocadas especialmente a cluster y cloud computing, con énfasis en las que utilizan procesadores de múltiples núcleos (multicores, GPUs y Xeon Phi), con el objetivo de modelizarlas, estudiar su escalabilidad, analizar y predecir performance de aplicaciones paralelas, estudiar el consumo energético y su impacto en la perfomance así como desarrollar esquemas para detección y tolerancia a fallas en las mismas. Profundizar el estudio...

INTEGRACIÓN DE APLICACIONES OPEN SOURCE Y PROTOCOLOS DE RED PARA UN SISTEMA DE RECUPERACIÓN AUTOMÁTICO DE SERVIDORES

Directory of Open Access Journals (Sweden)

Richard Lobo

2015-07-01

Full Text Available En una red coexisten diversos dispositivos de comunicación tales como switch (conmutadores, routers (enrutadores, firewall y los servidores; estos últimos garantizan el funcionamiento de los servicios de una red que son instalados por los administradores de redes, utilizando para ello un elevado número de herramientas y requiriendo un elevado grado de especialización para su correcta configuración. Cuando surge un problema en los servicios, la detección, diagnóstico y posterior solución dependerán de la disponibilidad de los encargados de administrar la red de datos, solución que podría tardar algún tiempo. Si algunos de estos servicios dejan de funcionar, traería como consecuencia la inoperatividad del servicio prestado, provocando el descontento de los usuarios. En el presente artículo, se desarrolla un sistema de recuperación automático de servidores (SIRAS realizando reinstalación remota y desatendida para el mejoramiento de los servicios de la Red de Datos del Rectorado la Universidad de los Andes (ULA Mérida, Venezuela. Para ello, se utilizan varias aplicaciones tales como sistemas de archivos remotos, protocolos de autoconfiguración de red, protocolo de transferencia de archivos, entre otros, que ayudan a optimizar los servicios de las redes en cuestión, sobre la infraestructura ya existente. Los datos se recolectaron directamente del lugar donde ocurren los hechos. Los resultados indican un comportamiento estable tanto para GNU/Linux en la interconexión de las aplicaciones, como para las comunicaciones en red, independientemente del sistema operativo utilizado. Además, el sistema SIRAS permitió mejorar los servicios de la red. Asimismo, se demostró que el hardware que aloja al sistema de recuperación no se vio afectado en su rendimiento al momento de la ejecución simultánea de todas las aplicaciones y protocolos de red que intervinieron en el sistema.

Implementación de un entorno cloud en las infraestructuras del laboratorio de aplicaciones telemáticas

OpenAIRE

Pereira Diéguez, Martín

2017-01-01

RESUMEN: En este trabajo se expone el procedimiento de despliegue de un entorno Cloud OpenStack utilizando dos soluciones de virtualización distintas. Citrix XenServer con Mirantis OpenStack y CentOS 7 con RDO PackStack ambas sobre servidores Huawei. Se integra dicha infraestructura en el Laboratorio de Aplicaciones de Telemáticas y se configuran los equipos de red para permitir el acceso desde el Laboratorio de Telemática. Además, se configuran el direccionamiento de los servidores para que ...

Spectrally resolved detection of sodium in the atmosphere of HD 189733b with the HARPS spectrograph

Science.gov (United States)

Wyttenbach, A.; Ehrenreich, D.; Lovis, C.; Udry, S.; Pepe, F.

2015-05-01

Context. Atmospheric properties of exoplanets can be constrained with transit spectroscopy. At low spectral resolution, this technique is limited by the presence of clouds. The signature of atomic sodium (Na i), known to be present above the clouds, is a powerful probe of the upper atmosphere, where it can be best detected and characterized at high spectral resolution. Aims: Our goal is to obtain a high-resolution transit spectrum of HD 189733b in the region around the resonance doublet of Na i at 589 nm, to characterize the absorption signature that was previously detected from space at low resolution. Methods: We analyzed archival transit data of HD 189733b obtained with the HARPS spectrograph (ℛ = 115 000) at the ESO 3.6-m telescope. We performed differential spectroscopy to retrieve the transit spectrum and light curve of the planet, implementing corrections for telluric contamination and planetary orbital motion. We compared our results to synthetic transit spectra calculated from isothermal models of the planetary atmosphere. Results: We spectrally resolve the Na i D doublet and measure line contrasts of 0.64 ± 0.07% (D2) and 0.40 ± 0.07% (D1) and FWHMs of 0.52 ± 0.08 Å. This corresponds to a detection at the 10σ level of excess of absorption of 0.32 ± 0.03% in a passband of 2 × 0.75 Å centered on each line. We derive temperatures of 2600 ± 600 K and 3270 ± 330 K at altitudes of 9800 ± 2800 and 12 700 ± 2600 km in the Na i D1 and D2 line cores, respectively. We measure a temperature gradient of ~0.2 K km-1 in the region where the sodium absorption dominates the haze absorption from a comparison with theoretical models. We also detect a blueshift of 0.16 ± 0.04 Å (4σ) in the line positions. This blueshift may be the result of winds blowing at 8 ± 2 km s-1 in the upper layers of the atmosphere. Conclusions: We demonstrate the relevance of studying exoplanet atmospheres with high-resolution spectrographs mounted on 4-m-class telescopes. Our

Spectrographic observations of solar microwave bursts in the 5.3-7.4 GHz range

International Nuclear Information System (INIS)

Kaverin, N.S.; Korshunov, A.I.; Shushunov, V.V.; Aurass, H.; Detlefs, H.; Hartmann, H.; Krueger, A.; Kurths, J.

1983-01-01

The first results of the Gorky-type microwave spectrograph of Tremsdorf solar radioastronomy observatory are given, observed after the reconstruction of the instrument to get a higher time resolution for the spectral observations. Two 5.3-7.4 GHz microwave burst spectral diagrams are shown having 20 s time resolution. Broad-bond spectral structures of the microwave burst development have been observed. Explanation of a 'pseudo-drift' phenomenon due to individual peaks is given. (D.Gy.)

SPECTROGRAPHIC DETERMINATION OF BERYLLIUM IN OILFIELD WATERS USING A PLASMA ARC

Energy Technology Data Exchange (ETDEWEB)

Collins, A. G.; Pearson, C. A.

1963-10-15

Geochemical studies of the distribution of the trace, minor, and major constituents of oilfield waters aid in the exploration for petroleum and other minerals, determination of the origin and distribution of oilfield waters and petroleum, and location of casing leaks and of water pollution sources. The determination of the beryllium and related data should be useful in these studies. An emission spectrographic method utilizing a plasma arc assembly for determining beryllium in oilfield waters, with a sensitivity permitting detection of less than 1 ppb, was developed. Beryllium was extracted from synthetic and natural oilfield waters with chloroform and acetylacetone. The extracts were aspirated directly into the plasma arc, and the beryllium emission intensity was recorded on photographic plates. (auth)

The spectrographic analysis of plutonium oxide or mixed plutonium oxide/uranium oxide fuel pellets by the dried residue technique

International Nuclear Information System (INIS)

Jarbo, G.J.; Faught, P.; Hildebrandt, B.

1980-05-01

An emission spectrographic method for the quantitative determination of metallic impurities in plutonium oxide and mixed plutonium oxide/uranium oxide is described. The fuel is dissolved in nitric acid and the plutonium and/or uranium extracted with tributyl phosphate. A small aliquot of the aqueous residue is dried on a 'mini' pyrolitic graphite plate and excited by high voltage AC spark in an oxygen atmosphere. Spectra are recorded in a region which has been specially selected to record simultaneously lines of boron and cadmium in the 2nd order and all the other elements of interest in the 1st order. Indium is used as an internal standard. The excitation of very small quantities of the uraniumm/plutonium free residue by high voltage spark, together with three separate levels of containment reduce the hazards to personnel and the environment to a minimum with limited effect on sensitivity and accuracy of the results. (auth)

Modelo de Sistema Basado en Conocimiento en el Dominio de la Seguridad de Aplicaciones

Directory of Open Access Journals (Sweden)

María Victoria Bajarlía

2013-12-01

Full Text Available El objetivo es proponer un modelo de un sistema basado en conocimiento (SBC aplicado al análisis de seguridad de aplicaciones de gestión. El modelo se fundamenta en un sistema basado en conocimiento (SBC que cuenta con un componente cognitivo que le permite incorporar conocimiento. En virtud de que las amenazas y los ataques informáticos representan un problema constante y creciente se puede suponer que el SBC, a través del aprendizaje dinámico que lo mantendrá actualizado, podrá asistir a los especialistas en Seguridad de la Información, en el área de competencia, a la elaboración de Especificación de Requerimientos.

Spectrographic study of λ 4200 silicon particular stars

International Nuclear Information System (INIS)

Didelon, Pierre

1983-01-01

This research thesis reports a spectrographic study of sample of particular stars belonging to the Si(II) λ 4200 subgroup which builds up the hot end of conventional 'Ap,Bp' stars. Twenty snapshots taken at the Haute-Provence observatory have been studied and compared with the observation of 17 standard stars. All these snapshots have been digitalised and processed. This allowed the identification of lines which indicated the presence of gallium and the absence of manganese which contradicts the close correlation between these elements that was generally admitted. An inexplicable and until now non observed duplication of Si(II) lines has also been observed. The problem of spectral classification of these stars has been studied. In order to study the concerned stars without calculation of atmospheric models, a comparative method between group stars and reference stars has been used. Results are discussed and seem to indicate an erratic and non-correlated behaviour of light elements (C, Mg, Ca, Si), and a presence of heavier elements (Ga, Sr) and rare earths (Eu, Gd) only when elements of the iron peak are stronger [fr

A Search for Rarely Seen Ultraviolet Coma Emissions and New Species Upper Limits at Comet 67P/Churyumov-Gerasimenko Using the Rosetta-Alice Ultraviolet Spectrograph

Science.gov (United States)

Noonan, J.; Stern, S. A.; Parker, J. W.; Keeney, B. A.; Weaver, H. A., Jr.; Feldman, P.; Steffl, A.; Feaga, L. M.; Bertaux, J. L.

2017-12-01

The Alice far/extreme-UV spectrograph aboard Rosetta is one of three US instruments provided by NASA; it is the first UV spectrograph to reach any comet. Numerous scientific results have been obtained regarding 67P/Churyumov-Gerasimenko by this instrument. Here we summarize two new sets of results from a search for rarely appearing atomic and molecular spectral emission features and a grand sum spectrum allowing us to place new atomic and molecular neutral and ionized species upper limits in the comet's coma.

Efecto de la química superficial del óxido de grafeno en el desarrollo de aplicaciones

OpenAIRE

Ramos Fernández, Gloria

2017-01-01

Las excelentes propiedades del grafeno, y la predicción de que este material pueda dar solución a todas las necesidades tecnológicas ha supuesto una gran revolución. Dada la versatilidad de este material, como consecuencia de los distintos métodos de producción disponibles, que generaran un material final con propiedades muy distintas, este se postula como un buen candidato para el desarrollo de distintas aplicaciones. Uno de los productos derivados de grafeno más usados es el óxido de grafe...

Investigating the Lyman photon escape in local starburst galaxies with the Cosmic Origins Spectrograph ★

Science.gov (United States)

Hernandez, Svea; Leitherer, Claus; Boquien, Médéric; Buat, Véronique; Burgarella, Denis; Calzetti, Daniela; Noll, Stefan

2018-04-01

We present a study of 7 star-forming galaxies from the Cosmic Evolution Survey (COSMOS) observed with the Cosmic Origins Spectrograph (COS) on board the Hubble Space Telescope (HST). The galaxies are located at relatively low redshifts, z ˜0.3, with morphologies ranging from extended and disturbed to compact and smooth. To complement the HST observations we also analyze observations taken with the VIMOS spectrograph on the Very Large Telescope (VLT). In our galaxy sample we identify three objects with double peak Lyman-α profiles similar to those seen in Green Pea compact galaxies and measure peak separations of 655, 374, and 275 km s-1. We measure Lyman-α escape fractions with values ranging between 5-13%. Given the low flux levels in the individual COS exposures we apply a weighted stacking approach to obtain a single spectrum. From this COS combined spectrum we infer upper limits for the absolute and relative Lyman continuum escape fractions of f_abs(LyC) = 0.4^{+10.1}_{-0.4}% and f_res(LyC) = 1.7^{+15.2}_{-1.7}%, respectively. Finally, we find that most of these galaxies have moderate UV and optical SFRs (SFRs ≲ 10 M⊙ yr-1).

XEROGELES DE CARBONO COMPETITIVOS DISEÑADOS PARA APLICACIONES ESPECÍFICAS

Directory of Open Access Journals (Sweden)

Ángel H. Moreno

2013-01-01

Full Text Available A pesar de su gran potencial, los xerogeles de carbono no se producen a gran escala debido a los largos y tediosos procesos tradicionales de obtención. El objetivo ha sido desarrollar un nuevo método de síntesis que permita su producción a gran escala de forma competitiva, sin perder el control de las propiedades y la posibilidad de producirlos a medida de cada aplicación. En este trabajo se presenta un nuevo proceso de obtención que permite reducir notablemente el tiempo del proceso de síntesis (>75% y utilizando un único dispositivo, constituyendo un paso muy importante para la implementación a escala industrial de la producción de xerogeles de carbono. En este trabajo se presentan resultados notables de dichos xerogeles de carbono en aplicaciones tan diversas como el almacenamiento de hidrógeno, como material activo en supercondensadores o como material de relleno en columnas de separación de gases, mostrando la gran versatilidad de estos materiales.

Hardening en servidor web Linux Apache, PHP y configurar el firewall de aplicaciones modsecurity para mitigar ataques al servidor

OpenAIRE

Espol; Delgado Quishpe, Byron Alberto

2017-01-01

Realizar un hardening al servidor web, se procederá a revisar las directivas en los archivos de configuración del servicio Apache, PHP, y se procederá a realizar instalación y configuración de un firewall de aplicaciones llamado mod_security la cual nos permitirá mitigar ataques a nuestro servidor web. realizando un análisis de vulnerabilidades encontrado en el servidor. Guayaquil Magíster en Seguridad Informática Aplicada

Calibrating the SNfactory Integral Field Spectrograph (SNIFS) with SCALA

Science.gov (United States)

Küsters, Daniel; Lombardo, Simona; Kowalski, Marek; Aldering, Greg; Nordin, Jakob; Rigault, Mickael

2016-08-01

The SNIFS CALibration Apparatus (SCALA), a device to calibrate the Supernova Integral Field Spectrograph on the University Hawaii 2.2m telescope, was developed and installed in Spring 2014. SCALA produces an artificial planet with a diameter of 1° and a constant surface brightness. The wavelength of the beam can be tuned between 3200 Å and 10000 Å and has a bandwidth of 35 Å. The amount of light injected into the telescope is monitored with NIST calibrated photodiodes. SCALA was upgraded in 2015 with a mask installed at the entrance pupil of the UH88 telescope, ensuring that the illumination of the telescope by stars is similar to that of SCALA. With this setup, a first calibration run was performed in conjunction with the spectrophotometric observations of standard stars. We present first estimates for the expected systematic uncertainties of the in-situ calibration and discuss the results of tests that examine the influence of stray light produced in the optics.

The application of spectrographic analysis to the radioisotope production control; Aplicacion del analisis espectrografico al control de produccion de radioisotopos

Energy Technology Data Exchange (ETDEWEB)

Capdevila, C; Roca, M

1972-07-01

The copper spark technique has been employed for both semi-quantitative and quantitative determinations of twelve usual impurities in the p.p.m. range, in Solutions of Mn-54, Fe-55, Fe-59 and Cr-51. The effect of the HCl concentration has previously been investigated: for the majority of elements the line intensities attain a maximum at 0.3 N HCl. To compensate for the influence of the concentration of the radioactive element, as well as of Na in the Cr-51 samples, Bi, 6a, In, Mo, Pd, TI and Y have been tested. Finally, the quantitative determination of each radioelement has been performed using the above-mentioned elements as internal standards, Ga and Ko giving the best results. (Author) 2 refs.

Análisis de eficiencia en arquitecturas multiprocesador para aplicaciones de transmisión y procesamiento de datos

OpenAIRE

Osio, Jorge R.; Salvatore, Juan Eduardo; Kunysz, Eduardo; Montezanti, Diego Miguel; Alonso, Daniel; Guarepi, V. L.; Morales, Daniel Martín

2017-01-01

Las principales líneas de investigación de este proyecto están orientadas a la utilización de arquitecturas multicore para cómputo paralelo en aplicaciones de Telemedicina, Procesamiento de Imágenes Médicas, robótica y de sistemas ópticos basados en MIOC, (Multifunctional Integrated Optical Chip), que requieren procesamiento y transmisión de datos de forma remota. Paralelamente a estos lineamientos, dentro del marco del proyecto se exploran nuevas tendencias en cómputo paralelo, siendo las...

KiwiSpec - an advanced spectrograph for high resolution spectroscopy: prototype design and performance

Science.gov (United States)

Gibson, Steve; Barnes, Stuart I.; Hearnshaw, John; Nield, Kathryn; Cochrane, Dave; Grobler, Deon

2012-09-01

A new advanced high resolution spectrograph has been developed by Kiwistar Optics of Industrial Research Ltd., New Zealand. The instrument, KiwiSpec R4-100, is bench-mounted, bre-fed, compact (0.75m by 1.5m footprint), and is well-suited for small to medium-sized telescopes. The instrument makes use of several advanced concepts in high resolution spectrograph design. The basic design follows the classical white pupil concept in an asymmetric implementation and employs an R4 echelle grating illuminated by a 100mm diameter collimated beam for primary dispersion. A volume phase holographic grating (VPH) based grism is used for cross-dispersion. The design also allows for up to four camera and detector channels to allow for extended wavelength coverage at high eciency. A single channel prototype of the instrument has been built and successfully tested with a 1m telescope. Targets included various spectrophotometric standard stars and several radial velocity standard stars to measure the instrument's light throughput and radial velocity capabilities. The prototype uses a 725 lines/mm VPH grism, an off-the-shelf camera objective, and a 2k×2k CCD. As such, it covers the wavelength range from 420nm to 660nm and has a resolving power of R ≍ 40,000. Spectrophotometric and precision radial velocity results from the on-sky testing period will be reported, as well as results of laboratory-based measurements. The optical design of KiwiSpec, and the various multi-channel design options, will be presented elsewhere in these proceedings.

Desarrollo de un algoritmo en MATLAB para la optimización de la resolución de una tarjeta USRP B210 para aplicaciones SDRadar

Directory of Open Access Journals (Sweden)

David Moreno Avilés

2017-11-01

Full Text Available En este documento se analizan las limitaciones y características que tiene la tarjeta USRP (Universal Software Radio Peripheral B210 para desarrollar aplicaciones de radar definidos por software (SDRadar. Para el desarrollo del algoritmo se utilizó un radar de onda continua modulada en frecuencia (FMCW que implementa una señal chirp, al considerar que 25 MHz es el máximo ancho de banda que la tarjeta puede proporcionar se obtiene como resultado una resolución de 6 metros. El método utilizado para optimizar la resolución de la tarjeta fue transmitir un determinado número de señales con distintos anchos de banda, lo que resulta en una resolución diferente, al detectar y almacenar el objetivo en una matriz. Después de las pruebas correspondientes el algoritmo estableció que con 14 mediciones con variaciones de ancho de banda de 0.5 MHz, entre cada señal, se obtiene la mayor optimización para mejorar la resolución de la tarjeta. Se obtuvo finalmente dos zonas de optimización, donde la primera zona está limitada por un error de medición menor a 1 metro, y en la segunda zona con un error de medición entre 1 y 2 metros con 69.15% y 30.85% de objetivos detectados respectivamente, lo que determina su efectividad y confiabilidad. Este trabajo ha demostrado que el algoritmo utilizado es útil en aplicaciones SDRadar para detectar objetivos para aplicaciones topográficas o sistemas SAR.

Microencapsulación con alginato en alimentos. Técnicas y aplicaciones

Directory of Open Access Journals (Sweden)

Bryshila Lupo Pasin

2012-01-01

Full Text Available El objetivo de este trabajo fue realizar una revisión de las técnicas de microencapsulación con alginato para aplicaciones en alimentos. El alginato ha sido uno de los polímeros más empleado en la microencapsulación, este forma una matriz altamente versátil, biocompatible y no tóxica para la protección de componentes activos, células o microorganismos sensibles al calor, pH, oxígeno y luz, entre otros factores, a los que son expuestos los alimentos durante el procesamiento y almacenaje. El proceso de microencapsulación con alginato se lleva a cabo a través de dos mecanismos de gelificación iónica: la gelificación externa y la gelificación interna, dependiendo de si el calcio se suministra desde fuera de las cápsulas o en el interior de las mismas. Para la preparación de microcápsulas de alginato de calcio con aplicaciones alimentarias, se tienen las técnicas por extrusión, en emulsión y secado por atomización. Aunque el secado por atomización ha sido para la industria un proceso práctico y económico, su aplicación con alginato se ha visto limitada por la viscosidad y velocidad de gelificación. Por el contrario, la técnica por extrusión ha sido la técnica tradicional empleada en las últimas décadas, debido a la uniformidad de las microcápsulas en su forma y tamaño. En este sentido, la técnica en emulsión es la aplicada más recientemente, la cual ha demostrado ser sencilla y de producción a gran escala. En la actualidad se desarrollan nuevas tecnologías a fin de disminuir el tamaño de las microcápsulas para así ampliar sus usos en la industria. Entre las últimas tendencias de microencapsulación, se estudian sistemas mixtos de matrices poliméricas con la finalidad de obtener propiedades físico-químicas combinadas, permitiendo hacer el proceso de encapsulación más eficiente tanto para la protección como para la liberación controlada del principio activo.

Microencapsulación con alginato en alimentos. Técnicas y aplicaciones

Directory of Open Access Journals (Sweden)

Bryshila Lupo Pasin

2012-06-01

Full Text Available El objetivo de este trabajo fue realizar una revisión de las técnicas de microencapsulación con alginato para aplicaciones en alimentos. El alginato ha sido uno de los polímeros más empleado en la microencapsulación, este forma una matriz altamente versátil, biocompatible y no tóxica para la protección de componentes activos, células o microorganismos sensibles al calor, pH, oxígeno y luz, entre otros factores, a los que son expuestos los alimentos durante el procesamiento y almacenaje. El proceso de microencapsulación con alginato se lleva a cabo a través de dos mecanismos de gelificación iónica: la gelificación externa y la gelificación interna, dependiendo de si el calcio se suministra desde fuera de las cápsulas o en el interior de las mismas. Para la preparación de microcápsulas de alginato de calcio con aplicaciones alimentarias, se tienen las técnicas por extrusión, en emulsión y secado por atomización. Aunque el secado por atomización ha sido para la industria un proceso práctico y económico, su aplicación con alginato se ha visto limitada por la viscosidad y velocidad de gelificación. Por el contrario, la técnica por extrusión ha sido la técnica tradicional empleada en las últimas décadas, debido a la uniformidad de las microcápsulas en su forma y tamaño. En este sentido, la técnica en emulsión es la aplicada más recientemente, la cual ha demostrado ser sencilla y de producción a gran escala. En la actualidad se desarrollan nuevas tecnologías a fin de disminuir el tamaño de las microcápsulas para así ampliar sus usos en la industria. Entre las últimas tendencias de microencapsulación, se estudian sistemas mixtos de matrices poliméricas con la finalidad de obtener propiedades físico-químicas combinadas, permitiendo hacer el proceso de encapsulación más eficiente tanto para la protección como para la liberación controlada del principio activo.

Diseño y desarrollo de una pasarela de interoperabilidad 802.15.4/802.3 para aplicaciones de sensores

OpenAIRE

López López, Gregorio Ignacio

2008-01-01

En los últimos años, las redes de sensores inalámbricas o WSNs (Wireless Sensor Networks) están ganando importancia en el sector de las telecomunicaciones debido a sus muchas y muy variadas aplicaciones. Se trata de redes de dimensiones reducidas, que requieren anchos de banda escasos, bajo consumo y bajo coste de despliegue y mantenimiento. Para promocionar y potenciar la incorporación de este tipo de redes al mercado de forma competitiva, el IEEE (Institute of Electrical and ...

Experimental studies of the break-up of 156 MeV 6Li-ions at extreme forward angles using the Karlsruhe magnetic spectrograph 'Little John'

International Nuclear Information System (INIS)

Jelitto, H.

1987-05-01

6 Li-induced break-up reactions have been investigated at reaction angles in extreme forward direction including O 0 with the Karlsruhe Magnetic Spectrograph 'Little John'. The experiments were characterized by the minimization of the high experimental background that dominates at small emission angles. Inclusive alpha-particle and deuteron spectra from the bombardement of 12 C- and 208 Pb-targets with 156 MeV 6 Li-ions have been measured. Below the grazing angle the Coulomb interaction shows a distinct influence on the angular distributions of the fragments. A simple spectator-model and a more realistic description within the DWBA-formalism largely allows a reproduction of the data. In the light of the reverse reaction α + d → 6 Li + γ at small α-d-relative energies, which is of considerable interest for astrophysics, a particle-particle-coincidence measurement with θ α = 5 0 and θ d = -2 0 has been performed. The result could be reproduced reasonably well by a simple Monte-Carlo-simulation. Beside the treatment of a physical problem this work deals with the start-up of the magnetic spectrograph and the clarification of spectrograph specific questions concerning the data reduction. (orig.) [de

Documentación y análisis de los principales frameworks de arquitectura de software en aplicaciones empresariales

OpenAIRE

Sarasty España, Hugo Fernando

2016-01-01

Este documento se enfoca en un tema común hoy en día en el ambiente tecnológico y empresarial, el cual es la arquitectura de software y su aplicabilidad a través de frameworks a proyectos empresariales. Este documento de investigación servirá de base para obtener un conocimiento y entendimiento de los frameworks de arquitectura de software más usados en el desarrollo de aplicaciones empresariales, determinando su aplicabilidad según el proyecto que se esté abordando. Facultad de Informátic...

Aplicaciones de los registros de resonancia magnética nuclear (nmrl) en la evaluación de yacimientos

OpenAIRE

Landi Torres, Richard Paúl

2008-01-01

La extraordinaria tecnología de adquisición de registros o perfilaje de resonancia magnética nuclear (RMN) ha estado en continua evolución durante los últimos 10 años. Las compañías petroleras utilizan las mediciones de RMN en una variedad de aplicaciones cada vez más numerosa; por ejemplo, para caracterizar los fluidos de las formaciones durante la evolución de los yacimientos y determinar la producibilidad de la formación. Hoy en día, las mediciones obtenidas con estas herramien...

The re-flight of the Colorado high-resolution Echelle stellar spectrograph (CHESS): improvements, calibrations, and post-flight results

Science.gov (United States)

Hoadley, Keri; France, Kevin; Kruczek, Nicholas; Fleming, Brian; Nell, Nicholas; Kane, Robert; Swanson, Jack; Green, James; Erickson, Nicholas; Wilson, Jacob

2016-07-01

In this proceeding, we describe the scientific motivation and technical development of the Colorado High- resolution Echelle Stellar Spectrograph (CHESS), focusing on the hardware advancements and testing supporting the second flight of the payload (CHESS-2). CHESS is a far ultraviolet (FUV) rocket-borne instrument designed to study the atomic-to-molecular transitions within translucent cloud regions in the interstellar medium (ISM). CHESS is an objective f/12.4 echelle spectrograph with resolving power > 100,000 over the band pass 1000 - 1600 Å. The spectrograph was designed to employ an R2 echelle grating with "low" line density. We compare the FUV performance of experimental echelle etching processes (lithographically by LightSmyth, Inc. and etching via electron-beam technology by JPL Microdevices Laboratory) with traditional, mechanically-ruled gratings (Bach Research, Inc. and Richardson Gratings). The cross-dispersing grating, developed and ruled by Horiba Jobin-Yvon, is a holographically-ruled, "low" line density, powered optic with a toroidal surface curvature. Both gratings were coated with aluminum and lithium fluoride (Al+LiF) at Goddard Space Flight Center (GSFC). Results from final efficiency and reflectivity measurements for the optical components of CHESS-2 are presented. CHESS-2 utilizes a 40mm-diameter cross-strip anode readout microchannel plate (MCP) detector fabricated by Sensor Sciences, Inc., to achieve high spatial resolution with high count rate capabilities (global rates 1 MHz). We present pre-flight laboratory spectra and calibration results. CHESS-2 launched on 21 February 2016 aboard NASA/CU sounding rocket mission 36.297 UG. We observed the intervening ISM material along the sightline to epsilon Per and present initial characterization of the column densities, temperature, and kinematics of atomic and molecular species in the observation.

Successful "First Light" for VLT High-Resolution Spectrograph

Science.gov (United States)

1999-10-01

control system, cf. ESO PR Photos 44/98 , were made in the laboratories of the ESO Headquarters in Garching (Germany) before it was fully dismounted and shipped (some parts by air, others by ship) to the ESO Paranal Observatory, 130 km south of Antofagasta (Chile). Here, the different pieces of UVES (with a total weight of 8 tons) were carefully reassembled on the Nasmyth platform of KUEYEN and made ready for real observations (see ESO PR Photos 36p-t/99 ). UVES is a complex two-channel spectrograph that has been built around two giant optical (echelle diffraction) gratings, each ruled on a 84 cm x 21 cm x 12 cm block of the ceramic material Zerodur (the same that is used for the VLT 8.2-m main mirrors) and weighing more than 60 kg. These echelle gratings finely disperse the light from celestial objects collected by the telescope into its constituent wavelengths (colours). UVES' resolving power (an optical term that indicates the ratio between a given wavelength and the smallest wavelength difference between two spectral lines that are clearly separated by the spectrograph) may reach 110,000, a very high value for an astronomical instrument of such a large size. This means for instance that even comparatively small changes in radial velocity (a few km/sec only) can be accurately measured and also that it is possible to detect the faint spectral signatures of very rare elements in celestial objects. One UVES channel is optimized for the ultraviolet and blue, the other for visual and red light. The spectra are digitally recorded by two highly efficient CCD detectors for subsequent analysis and astrophysical interpretation. By optimizing the transmission of the various optical components in its two channels, UVES has a very high efficiency all the way from the UV (wavelength about 300 nm) to the near-infrared (1000 nm or 1 µm). This guarantees that only a minimum of the precious light that is collected by KUEYEN is lost and that detailed spectra can be obtained of even

Application of the identification methods from Hilbert and Prony to the study of oscillatory phenomena in electrical power systems; Aplicacion de los metodos de identificacion de Hilbert y Prony al estudio de fenomenos oscilatorios en sistemas electricos de potencia

Energy Technology Data Exchange (ETDEWEB)

Andrade Soto, Manuel Antonio

2002-10-15

In the present thesis work the application of identification techniques is investigated based on methods of spectral analysis to the study of the instantaneous characteristics of signals obtained by means of digital simulation of the dynamic behavior of the power system. The study focuses on the perspectives developed from two different approaches of analysis: the use of lineal methods of spectral analysis and the use of methods of non-lineal analysis, based on the concept of an analytical signal. The developed tools are applied to the study of two phenomena of electromechanical origin of different characteristics in complex power systems. A comparison between the results obtained is performed for these techniques and the possibility of its application is discussed for the problem of on-line identification in power systems. [Spanish] En el presente trabajo de tesis se investiga la aplicacion de tecnicas de identificacion basadas en metodos de analisis espectral al estudio de las caracteristicas instantaneas de senales obtenidas mediante simulacion digital del comportamiento dinamico del sistema de potencia. El estudio se centra en las aproximaciones desarrolladas desde dos enfoques distintos de analisis: la utilizacion de metodos lineales de analisis espectral y la utilizacion de metodos de analisis no lineal, basados en el concepto de una senal analitica. Las herramientas desarrolladas se aplican al estudio de dos fenomenos de origen electromecanico de caracteristicas distintas en sistemas complejos de potencia. Se hace una comparacion entre los resultados obtenidos por estas tecnicas y se discute la posibilidad de su aplicacion al problema de identificacion en linea en sistemas de potencia.

A flux calibration device for the SuperNova Integral Field Spectrograph (SNIFS)

Science.gov (United States)

Lombardo, Simona; Aldering, Greg; Hoffmann, Akos; Kowalski, Marek; Kuesters, Daniel; Reif, Klaus; Rigault, Michael

2014-07-01

Observational cosmology employing optical surveys often require precise flux calibration. In this context we present SNIFS Calibration Apparatus (SCALA), a flux calibration system developed for the SuperNova Integral Field Spectrograph (SNIFS), operating at the University of Hawaii 2.2 m telescope. SCALA consists of a hexagonal array of 18 small parabolic mirrors distributed over the face of, and feeding parallel light to, the telescope entrance pupil. The mirrors are illuminated by integrating spheres and a wavelength-tunable (from UV to IR) light source, generating light beams with opening angles of 1°. These nearly parallel beams are flat and flux-calibrated at a subpercent level, enabling us to calibrate our "telescope + SNIFS system" at the required precision.

La Seguridad en Internet de las Cosas: Analizando el Tráfico de Información en Aplicaciones para iOS

Directory of Open Access Journals (Sweden)

Juan-Manuel Martínez

2017-05-01

Full Text Available En los últimos años se ha observado un gran avance tecnológico y el servicio de Internet no es la excepción (en México el servicio doméstico básico es 180 veces más rápido que hace 15 años. Esto ha permitido conectar cada vez más dispositivos, surgiendo así el Internet de las cosas (IoT. De esta manera, el número de dispositivos conectados ha alcanzado una cifra aproximada de 20 mil millones, y se espera que para 2020 llegue a 50 mil millones. Esto ha generado grandes retos para mantener la seguridad y privacidad de la información ya que la mayoría de los dispositivos de IoT se centran en la conectividad y están incluyendo configuraciones por defecto donde la seguridad se ve gravemente afectada. Este artículo presenta los resultados del análisis de tráfico realizado a diversas aplicaciones para iOS, con el objetivo de informar lo fácil que puede ser capturar el tráfico, aunque se utilice el protocolo https y que aún existen muchas aplicaciones que transmiten información sin cifrar.

Non-Maxwellian Analysis of the Transition-region Line Profiles Observed by the Interface Region Imaging Spectrograph

Energy Technology Data Exchange (ETDEWEB)

Dudík, Jaroslav; Dzifčáková, Elena [Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 251 65 Ondřejov (Czech Republic); Polito, Vanessa; Testa, Paola [Smithsonian Astrophysical Observatory, 60 Garden Street, MS 58, Cambridge, MA 02138 (United States); Zanna, Giulio Del, E-mail: dudik@asu.cas.cz [Department of Applied Mathematics and Theoretical Physics, CMS, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)

2017-06-10

We investigate the nature of the spectral line profiles for transition-region (TR) ions observed with the Interface Region Imaging Spectrograph (IRIS) . In this context, we analyzed an active-region observation performed by IRIS in its 1400 Å spectral window. The TR lines are found to exhibit significant wings in their spectral profiles, which can be well fitted with a non-Maxwellian κ distribution. The fit with a κ distribution can perform better than a double-Gaussian fit, especially for the strongest line, Si iv 1402.8 Å. Typical values of κ found are about 2, occurring in a majority of spatial pixels where the TR lines are symmetric, i.e., the fit can be performed. Furthermore, all five spectral lines studied (from Si iv, O iv, and S iv) appear to have the same full-width at half-maximum irrespective of whether the line is an allowed or an intercombination transition. A similar value of κ is obtained for the electron distribution by the fitting of the line intensities relative to Si iv 1402.8 Å, if photospheric abundances are assumed. The κ distributions, however, do not remove the presence of non-thermal broadening. Instead, they actually increase the non-thermal width. This is because, for κ distributions, TR ions are formed at lower temperatures. The large observed non-thermal width lowers the opacity of the Si iv line sufficiently enough for this line to become optically thin.

Contribuciones a estándares y tecnologías de comunicación en dispositivos médicos para e-Salud: Integración en aplicaciones de telemonitorización y gestión de la información

OpenAIRE

Escayola Calvo, Javier; García Moros, José; Martínez Ruiz, Ignacio

2012-01-01

La salud electrónica o e-Salud está llamada a ser la nueva plataforma sobre la que se base la sanidad de las próximas generaciones y cada día surgen nuevos proyectos y aplicaciones que proponen diferentes formas de implementar esta nueva doctrina. Está claro que los recursos tecnológicos puestos al alcance para el desarrollo distan en gran medida de los de generaciones anteriores y, por lo tanto, cabe esperar en el futuro el surgimiento de numerosas e interesantes aplicaciones. En este sentid...

Explorando nuevos recursos virtuales con alumnos de Informática: aplicaciones educativas a las clases de Inglés

OpenAIRE

Martín, Clemencia Adriana Nelly

2012-01-01

El hecho innegable que los recursos de la Web Social han impactado positivamente en la enseñanza de lenguas extranjeras, nos hace abrirnos a la perspectiva que supone la transferencia de dichas tecnologías al campo educativo. A tal efecto, sostenemos que los actuales quehaceres y prácticas educativas resultan fértiles para ser potenciados con la adopción de aplicaciones tecnológicas innovadoras, que signifiquen una ganancia cognitiva tanto para los que aprenden como para los que enseñan. ...

Electrochemical techniques application in corrosion problems of fossil power plants; Aplicacion de tecnicas electroquimicas en problemas de corrosion en centrales termoelectricas

Energy Technology Data Exchange (ETDEWEB)

Cano Castillo, Ulises; Garcia Ochoa, Esteban Miguel; Martinez Villafane, Alberto; Mariaca Rodriguez, Liboria; Malo Tamayo, Jose Maria; Uruchurtu Chavarin, Jorge [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1991-12-31

Some aspects of the electrochemical techniques employed to evaluate the corrosion at low temperature in fossil power plants are commented, as well as the results obtained with the application of them in three power plants of this type. [Espanol] Se comentan algunos aspectos de tecnicas electroquimicas utilizadas para evaluar la corrosion en baja temperatura en centrales termoelectricas, asi como los resultados de la aplicacion de las mismas en tres centrales de este tipo.

Electrochemical techniques application in corrosion problems of fossil power plants; Aplicacion de tecnicas electroquimicas en problemas de corrosion en centrales termoelectricas

Energy Technology Data Exchange (ETDEWEB)

Cano Castillo, Ulises; Garcia Ochoa, Esteban Miguel; Martinez Villafane, Alberto; Mariaca Rodriguez, Liboria; Malo Tamayo, Jose Maria; Uruchurtu Chavarin, Jorge [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

1990-12-31

Some aspects of the electrochemical techniques employed to evaluate the corrosion at low temperature in fossil power plants are commented, as well as the results obtained with the application of them in three power plants of this type. [Espanol] Se comentan algunos aspectos de tecnicas electroquimicas utilizadas para evaluar la corrosion en baja temperatura en centrales termoelectricas, asi como los resultados de la aplicacion de las mismas en tres centrales de este tipo.

El potencial de las aplicaciones educativas en el proceso de evaluación formativa

Directory of Open Access Journals (Sweden)

Mayara Lustosa de Oliveira

2017-07-01

Full Text Available El debate sobre los objetivos reales de la evaluación no es nuevo. Sin embargo, todavía predominan aspectos como la excesiva valoración de la memoria, lo que refleja una visión tradicional y limitada. Es necesario superar el uso exclusivo de la evaluación tradicional con el fin de adoptar una evaluación formativa, modalidad que busca identificar las fallas y necesidades de los estudiantes durante el proceso educativo con el fin de recibir retroalimentación para tomar las medidas necesarias que permitan mejorar la enseñanza y el aprendizaje. Siguiendo esta necesidad, y buscando ayudar a los profesores en la aplicación de una evaluación formativa, algunos recursos tecnológicos han sido desarrollados. El presente trabajo tiene como objetivo describir el potencial de tres aplicaciones (Armet, The Cell y 3DClass en el proceso de evaluación formativa usando las bases de datos asociadas a cada aplicación. Los resultados muestran que estas aplicaciones proporcionan métricas de evaluación más transparentes, coherentes y que permiten al profesor sistematizar criterios e indicadores, lo que reduce la subjetividad del proceso de evaluación formativa y el tiempo necesario para la preparación, tabulación y análisis de datos. Gracias a que con esta tecnología es posible verificar en tiempo real el número de errores totales y por pregunta preguntas con el mayor número de errores recurrentes, preguntas con el mayor y menor índice de aciertos y el tiempo que los alumnos emplean para desarrollar la actividad, es posible determinar el progreso de los alumnos a lo largo del tiempo e identificar puntualmente dónde ocurren los errores; esto permite una investigación minuciosa sobre sus posibles causas. Esta información facilita la retroalimentación para los alumnos, ya sea como intervenciones puntuales o direccionadas por parte del profesor.

Aplicaciones de la agricultura de precisión en palma de aceite "Elaeis Guineensis" e hibrido O x G

OpenAIRE

Lizarazo Salcedo, Iván Alberto; Alfonso Carvajal, Oscar Alberto

2011-01-01

La agricultura de precisión está basada en el reconocimiento de la variabilidad espacial y temporal del clima, los suelos y los cultivos, y consecuentemente, de la importancia de proporcionar un manejo agronómico específico que tenga en cuenta esas diferencias. En este artículo se describe la perspectiva y los conceptos de agricultura de precisión que se están desarrollando en el sector de la palma de aceite en Colombia. En particular, se presentan dos aplicaciones que resuelven las limitacio...

Design and fabrication of a Czerny-Turner monochromator-cum-spectrograph

International Nuclear Information System (INIS)

Murty, M.V.R.K.; Shukla, R.P.; Bhattacharya, S.S.; Krishnamurthy, G.

1987-01-01

The design and fabrication of a Czerny-Turner monochromator cum spectrograph is described. It consists of a classically ruled grating having 1200 grooves/mm. The collimator is a concave spherical mirror having a radius of curvature 1.025 metre while the focusing element is a concave spherical mirror of radius of curvature 0.925 metre. The design of two unequal radii of curvature for collimating and focusing mirrors is chosen to eliminate the chromatic aberration at the wavelength of 5000A. The linear reciprocal dispersion on the focal surface is about 8A/mm. The resolution of the instrument at the coma corrected wavelength i.e. 5000A is 0.1A. The resolution at the other wavelengths is limited by the residual chromatic aberration which increases linearly with wavelength on either side of the 5000A. Therefore the resolution at the wavelength 2000A and 8000A is about 0.2A. 7 figures. (author)

evaluación de conceptos y aplicaciones

Directory of Open Access Journals (Sweden)

Naomar Almeida-Filho

2006-01-01

Full Text Available Varios elementos epistemológicos y metodológicos han sido propuestos como tendencia alternativa a la ciencia contemporánea, agrupados bajo el rótulo de "nuevo paradigma" y con diferentes grados de interarticulación. Estos elementos sugieren que una nuova scienza se encuentra en desarrollo, demandando categorías epistemológicas propias (como la categoría de la complejidad, nuevos modelos teóricos (como la "teoría del caos" y nuevas formas lógicas de análisis (como los modelos matemáticos no lineales, la geometría fractal, la lógica borrosa y la teoría de redes. También en el campo de la Salud Colectiva, varios autores han defendido la necesidad de nuevos paradigmas. Esas propuestas vienen siendo ampliadas y difundidas con el objetivo de fomentar una producción científica concreta, capaz de alimentar efectivamente un posible paradigma nuevo. En este texto se pretende presentar brevemente los principales enfoques que representan algún tipo de cambio paradigmático de un modo general en el seno de la ciencia. También se discuten algunos de los diversos elementos constitutivos del paradigma de la complejidad, desde sus posibles aplicaciones a la problemática de la salud en poblaciones, buscando examinar estas cuestiones en el ámbito de nuestro interés específico e indicando algunas tentativas en el sentido de producir evidencias empíricas para el análisis de la situación de salud, sus efectos y sus determinantes a partir de estos abordajes.

The spectrographic analysis of inorganic impurities in heavy water; Analyse spectrographique des impuretes minerales dans l'eau lourde

Energy Technology Data Exchange (ETDEWEB)

Artaud, J; Normand, J [Commissariat a l' Energie Atomique, Service d' Analyses et de Recherches Chimiques Appliquees, Saclay (France). Centre d' Etudes Nucleaires; Vie, R [Commissariat a l' Energie Atomique, Service d' Etude de Traitement des Combustibles Irradies, Saclay (France). Centre d' Etudes Nucleaires

1961-07-01

Inorganic impurities in heavy water are determined by two spectrographic methods. First is described the copper-spark method which is sensitive and directly applicable, and is particular useful because of the absence of a support. Secondly the graphite impregnation method is given; this is used when the first method is not applicable (determination of copper) and for the alkali metals. For the usual elements, the sensitivity of the copper spark method is of the order of 0,1 {mu}g/ml whereas for the graphite impregnation method the sensitivity is only 0,3 {mu}g/ml. (author) [French] Les impuretes minerales dans l'eau lourde sont dosees au moyen de deux methodes spectrographiques. On decrit en premier lieu la methode 'copper spark' sensible directement applicable, et particulierement favorable du fait de l'absence de matrice. En second lieu, on decrit la methode d'impregnation du graphite, utilisee lorsque la methode precedente tombe en defaut (recherche du cuivre) et pour les alcalins. Avec la methode 'copper spark' nous obtenons pour les elements courants, des sensibilites de l'ordre de 0,1 {mu}g/ml, alors qu'elles ne sont que de 0,3 {mu}g/ml pour les alcalins doses a l'arc sur graphite impregne. (auteur)

Anales jAUTI'17 : 6ª Jornadas de Aplicaciones y Usabilidade de la Televisión Digital Interativa

OpenAIRE

Ferraz de Abreu, Jorge; Abásolo Guerrero, María José; Almeida, Pedro; Silva, Telmo

2017-01-01

Damos as boas-vindas a todos os participantes da 6ª Conferência Ibero Americana em Usabilidade e Aplicações de TV Interativa - jAUTI’2017. Esta conferência é uma organização conjunta do grupo Social iTV da Unidade de Investigação DigiMedia da Universidade de Aveiro e da RedAUTI (Red temática en Aplicaciones y Usabilidad de la Television digital Interactiva). A edição deste ano (12 e 13 de outubro de 2017 - Universidade de Aveiro, Portugal), reúne investigadores de várias universidades e da...

KiwiSpec: The Design and Performance of a High Resolution Echelle Spectrograph for Astronomy

Science.gov (United States)

Gibson, Steven Ross

This document describes the design, analysis, construction and testing of KiwiSpec, a fibre-fed, high resolution astronomical spectrograph of an asymmetric white pupil design. The instrument employs an R4, 31.6 groove mm-1 échelle grating for primary dispersion and a 725 lines mm-1 volume phase holographic (VPH) based grism for cross-dispersion. Two versions of the prototype were designed and constructed: an 'in-air' prototype, and a prototype featuring a vacuum chamber (to increase the stability of the instrument). The KiwiSpec optical design is introduced, as well as a description of the theory behind a cross-dispersed échelle spectrograph. The results of tolerancing the optical design are reported for alignment, optical fabrication, and optical surface quality groups of parameters. The optical windows of an iodine cell are also toleranced. The opto-mechanical mounts of both prototypes are described in detail, as is the design of the vacuum chamber system. Given the goal of 1 m/s radial velocity stability, analyses were undertaken to determine the allowable amount of movement of the vacuum windows, and to determine the allowable changes in temperature and pressure within and outside of the vacuum chamber. The spectral efficiency of the instrument was estimated through a predictive model; this was calculated for the as-built instrument and also for an instrument with ideal, high-efficiency coatings. Measurements of the spectral efficiency of various components of the instrument are reported, as well as a description of the measurement system developed to test the efficiency of VPH gratings. On-sky efficiency measurements from use of KiwiSpec on the 1-m McLellan telescope at Mt John University Observatory are reported. Two possible exposure meter locations are explored via an efficiency model, and also through the measurement of the zero-order reflectivity of the échelle grating. Various stability aspects of the design are investigated. These include the

The Behavior of Warm Molecules in Planet-forming Disks and CHESS: a Pathfinder UV Spectrograph for the LUVOIR Surveyor

Science.gov (United States)

Hoadley, Keri; France, Kevin

2017-01-01

Understanding the evolution of gas over the lifetime of protoplanetary disks provides us with important clues about how planet formation mechanisms drive the diversity of exoplanetary systems observed to date. In the first part of my talk, I will discuss how we use emission line observations of molecular hydrogen (H2) in the far-ultraviolet (far-UV) with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope to study the warm molecular regions (a CHESS), built as a demonstration of one component of the LUVOIR spectrograph and new technological improvements to UV optical components for the next generation of near- to far-UV astrophysical observatories. CHESS is a far-UV sounding rocket experiment designed to probe the warm and cool atoms and molecules near sites of recent star formation in the local interstellar medium. I will talk about the science goals, design, research and development (R&D) components, and calibration of the CHESS instrument. I will end by presenting the initial data reduction and results of the flight observations taken during the second launch of CHESS.

SCALA: In situ calibration for integral field spectrographs

Science.gov (United States)

Lombardo, S.; Küsters, D.; Kowalski, M.; Aldering, G.; Antilogus, P.; Bailey, S.; Baltay, C.; Barbary, K.; Baugh, D.; Bongard, S.; Boone, K.; Buton, C.; Chen, J.; Chotard, N.; Copin, Y.; Dixon, S.; Fagrelius, P.; Feindt, U.; Fouchez, D.; Gangler, E.; Hayden, B.; Hillebrandt, W.; Hoffmann, A.; Kim, A. G.; Leget, P.-F.; McKay, L.; Nordin, J.; Pain, R.; Pécontal, E.; Pereira, R.; Perlmutter, S.; Rabinowitz, D.; Reif, K.; Rigault, M.; Rubin, D.; Runge, K.; Saunders, C.; Smadja, G.; Suzuki, N.; Taubenberger, S.; Tao, C.; Thomas, R. C.; Nearby Supernova Factory

2017-11-01

Aims: The scientific yield of current and future optical surveys is increasingly limited by systematic uncertainties in the flux calibration. This is the case for type Ia supernova (SN Ia) cosmology programs, where an improved calibration directly translates into improved cosmological constraints. Current methodology rests on models of stars. Here we aim to obtain flux calibration that is traceable to state-of-the-art detector-based calibration. Methods: We present the SNIFS Calibration Apparatus (SCALA), a color (relative) flux calibration system developed for the SuperNova integral field spectrograph (SNIFS), operating at the University of Hawaii 2.2 m (UH 88) telescope. Results: By comparing the color trend of the illumination generated by SCALA during two commissioning runs, and to previous laboratory measurements, we show that we can determine the light emitted by SCALA with a long-term repeatability better than 1%. We describe the calibration procedure necessary to control for system aging. We present measurements of the SNIFS throughput as estimated by SCALA observations. Conclusions: The SCALA calibration unit is now fully deployed at the UH 88 telescope, and with it color-calibration between 4000 Å and 9000 Å is stable at the percent level over a one-year baseline.

Efecto del calcio en aplicaciones precosecha y poscosecha sobre la severidad de antracnosis (Colletotrichum gloeosporioides y la calidad de frutos de papaya (Carica papaya

Directory of Open Access Journals (Sweden)

Daniel Saborío

2000-01-01

Full Text Available Se evalu6 el efecto de aplicaciones pre- cosecha y poscosecha de calcio en papaya va- riedad "criolla" sabre la severidad de antracno- sis (CoUetotrichum gloeosporioides y varia- hIes de calidad del fruto. Los tratamientos pre- cosecha fueron 4: aspersi6n de CaCl2 al 1% Y 4% (2 aplicaciones: <40 dfas posantesis (dpa y entre 100-140 dpa con el penetrante alquilaril- polimero (NP- 7 Bayer (0.4 mIlL, CaCO3 al suelo (1 ton/ha, 70 dpa y testigo (0% Ca. El diseno experimental fue un BCA (4 repeticio- nes de 20 frutos. Los tratamientos poscosecha fueron 3: inmersiones par 5 min con 0%, 1 % Y 4% de CaCI2, con el mismo penetrante. El dise- no experimental fue un BCA (3 repeticiones de 15 frutas. Se evalu6 severidad, % calcio en cascara, brix, pH, % acidez, firmeza (cascara y pulpa y % de madurez. En la aplicaci6n de cal- cia precosecha la severidad fue: 1 % CaC12 con 6%, testigo 7%, CaCO3 9% y 4% CaC12 con 11 %, no se encontr6 que el Ca tuviera un efec-

The Goddard Integral Field Spectrograph at Apache Point Observatory: Current Status and Progress Towards Photon Counting

Science.gov (United States)

McElwain, Michael W.; Grady, Carol A.; Bally, John; Brinkmann, Jonathan V.; Bubeck, James; Gong, Qian; Hilton, George M.; Ketzeback, William F.; Lindler, Don; Llop Sayson, Jorge; Malatesta, Michael A.; Norton, Timothy; Rauscher, Bernard J.; Rothe, Johannes; Straka, Lorrie; Wilkins, Ashlee N.; Wisniewski, John P.; Woodgate, Bruce E.; York, Donald G.

2015-01-01

We present the current status and progress towards photon counting with the Goddard Integral Field Spectrograph (GIFS), a new instrument at the Apache Point Observatory's ARC 3.5m telescope. GIFS is a visible light imager and integral field spectrograph operating from 400-1000 nm over a 2.8' x 2.8' and 14' x 14' field of view, respectively. As an IFS, GIFS obtains over 1000 spectra simultaneously and its data reduction pipeline reconstructs them into an image cube that has 32 x 32 spatial elements and more than 200 spectral channels. The IFS mode can be applied to a wide variety of science programs including exoplanet transit spectroscopy, protostellar jets, the galactic interstellar medium probed by background quasars, Lyman-alpha emission line objects, and spectral imaging of galactic winds. An electron-multiplying CCD (EMCCD) detector enables photon counting in the high spectral resolution mode to be demonstrated at the ARC 3.5m in early 2015. The EMCCD work builds upon successful operational and characterization tests that have been conducted in the IFS laboratory at NASA Goddard. GIFS sets out to demonstrate an IFS photon-counting capability on-sky in preparation for future exoplanet direct imaging missions such as the AFTA-Coronagraph, Exo-C, and ATLAST mission concepts. This work is supported by the NASA APRA program under RTOP 10-APRA10-0103.

Posicionamiento y proyección actual del motor de paso en aplicaciones industriales. // Position and proyection in actual industrial applications of stepping motors.

OpenAIRE

A. Codina García

2002-01-01

El presente trabajo aborda el empleo del motor de paso en las aplicaciones industriales actuales, los recientesavances y tendencias en la construcción de los mismos así como sus principales características y variantes másconocidas.Palabras claves: Motores de paso, control de movimiento.______________________________________________________________________Abstract.This paper focuses on the position of stepping motors in current industrial applications, recent advances andgeneral trends in desi...

DARKNESS: A Microwave Kinetic Inductance Detector Integral Field Spectrograph for High-contrast Astronomy

Science.gov (United States)

Meeker, Seth R.; Mazin, Benjamin A.; Walter, Alex B.; Strader, Paschal; Fruitwala, Neelay; Bockstiegel, Clint; Szypryt, Paul; Ulbricht, Gerhard; Coiffard, Grégoire; Bumble, Bruce; Cancelo, Gustavo; Zmuda, Ted; Treptow, Ken; Wilcer, Neal; Collura, Giulia; Dodkins, Rupert; Lipartito, Isabel; Zobrist, Nicholas; Bottom, Michael; Shelton, J. Chris; Mawet, Dimitri; van Eyken, Julian C.; Vasisht, Gautam; Serabyn, Eugene

2018-06-01

We present DARKNESS (the DARK-speckle Near-infrared Energy-resolving Superconducting Spectrophotometer), the first of several planned integral field spectrographs to use optical/near-infrared Microwave Kinetic Inductance Detectors (MKIDs) for high-contrast imaging. The photon counting and simultaneous low-resolution spectroscopy provided by MKIDs will enable real-time speckle control techniques and post-processing speckle suppression at frame rates capable of resolving the atmospheric speckles that currently limit high-contrast imaging from the ground. DARKNESS is now operational behind the PALM-3000 extreme adaptive optics system and the Stellar Double Coronagraph at Palomar Observatory. Here, we describe the motivation, design, and characterization of the instrument, early on-sky results, and future prospects.

Spectrographic determination of impurities in ammonium bifluoride. III. Study of the processes of vaporization, transport and excitation of the elements Al, B, Cu and Cr; Determinacion espectrografico de impurezas en bifluoruro amonico. III. Estudio de los procesos de volatilizacion, transporte y excitacion de los elementos Al, B, Cu, Cr

Energy Technology Data Exchange (ETDEWEB)

Alduan, F A; Roca, M; Capdevila, C

1979-07-01

The influences of the processes of vaporization, transport and excitation on the shape of the volatilization-excitation curves and on the values of the spectral-line intensities have been investigated in a method for the spectrographic determination of Al, B, Cu and Cr In ammonium bifluoride samples by direct current are excitation in Scribner type electrodes, with addition of different matrices (graphite, 63203, GeO{sub 2}, MgO and Zn0). The reaction products in the electrode cavity have been identified by X-ray powder diffraction analysis and the percentages of vaporized and diffused element evaluated through analysis by total-burning spectrographic methods. In addition, the values of both the number of particles entering the discharge column and the transport efficiencies have been calculated. Thus, the origin of most observed differences has been explained. (Author) 11 refs.

APLICACIONES EN TRATAMIENTO DE AGUA DE LOS MICROSTRAINERS: REVISIÓN

Directory of Open Access Journals (Sweden)

Diana Lucía Cristancho

2007-01-01

Full Text Available Se presenta una revisión sobre el desarrollo histórico de los microstrainers y sus principales aplicaciones en tratamiento de agua, así mismo, se plantea la posibilidad de utilizar esta tecnología en 'pulimento' de efluentes de sistemas de tratamiento de aguas residuales que emplean lagunas de estabilización, en particular, para reducir el contenido de algas. Se concluye que los microstrainers permiten alcanzar eficiencias de reducción de sólidos en suspensión y algunas especies de algas satisfactoriamente, además de representar una alternativa que en combinación con los procesos convencionales podría mejorar el rendimiento de las plantas de tratamiento de agua.This article presents the historical development of microstrainers and their main application in water treatment. It also proposes the possibility to use technology in 'polishing' the effluent of wastewater treatment that uses stabilization ponds to particularly reduce the content of algae. And the article concludes that the microstrainers allow us to reach satisfactory reduction efficiencies of suspended solids and some species of algae. They also represent an alternative that, in combination with the conventional processes, could improve the performance of water treatment plants.

A mask quality control tool for the OSIRIS multi-object spectrograph

Science.gov (United States)

López-Ruiz, J. C.; Vaz Cedillo, Jacinto Javier; Ederoclite, Alessandro; Bongiovanni, Ángel; González Escalera, Víctor

2012-09-01

OSIRIS multi object spectrograph uses a set of user-customised-masks, which are manufactured on-demand. The manufacturing process consists of drilling the specified slits on the mask with the required accuracy. Ensuring that slits are on the right place when observing is of vital importance. We present a tool for checking the quality of the process of manufacturing the masks which is based on analyzing the instrument images obtained with the manufactured masks on place. The tool extracts the slit information from these images, relates specifications with the extracted slit information, and finally communicates to the operator if the manufactured mask fulfills the expectations of the mask designer. The proposed tool has been built using scripting languages and using standard libraries such as opencv, pyraf and scipy. The software architecture, advantages and limits of this tool in the lifecycle of a multiobject acquisition are presented.

Aplicaciones de la agricultura de precisión en palma de aceite “Elaeis Guineensis” e hibrido O x G

OpenAIRE

Iván Alberto Lizarazo Salcedo; Oscar Alberto Alfonso Carvajal

2011-01-01

La agricultura de precisión está basada en el reconocimiento de la variabilidad espacial y temporal del clima, los suelos y los cultivos, y consecuentemente, de la importancia de proporcionar un manejo agronómico específico que tenga en cuenta esas diferencias. En este artículo se describe la perspectiva y los conceptos de agricultura de precisión que se están desarrollando en el sector de la palma de aceite en Colombia. En particular, se presentan dos aplicaciones que resuelven las limit...

Desarrollo de material didáctico multimedia del cultivo de tejidos vegetales con aplicaciones agrarias y ambientales

Directory of Open Access Journals (Sweden)

Oscar Agudelo Varela

2017-09-01

Full Text Available Las aplicaciones pedagógicas tradicionales se fundamentan en el desarrollo de la clase con marcador y tablero, y con leves avances en el manejo de diapositivas; sin embargo, las tecnologías digitales presentan una serie de novedades que complementan el trabajo de la enseñanza con aprendizaje autónomo, que puede desarrollar el educando en áreas agrarias y ambientales. El desarrollo de material didáctico multimedia MDM complementa las actividades curriculares de los cursos, particularmente, los que tienen laboratorio, y por otro lado, generan en el estudiante habilidades para el aprendizaje autónomo. Se desarrolló un MDM para el aprendizaje de las prácticas realizadas en el laboratorio de cultivos vegetales, con arquitectura cliente/ servidor, usando tecnologías actuales en el desarrollo de software, con características de tiempo real y bajo el paradigma de desarrollo de aplicaciones isomórficas. Con base al MDM, se realizó evaluación cualitativa por parte de estudiantes de Licenciatura en Producción Agropecuaria, la cual reporto un 86% de aprobación del material. Se encontró que las herramientas digitales para el aprendizaje, facilitan y mejoran en cierta medida el aprendizaje de los educandos. El uso de tecnologías nuevas como React, permite mejorar el renderizado de las páginas y optimiza la carga del servidor en las peticiones necesarias por parte del aprendiz, y hace más eficiente el engranaje de enseñanza-aprendizaje. De esta manera, el MDM permitirá fundamentar el desarrollo de habilidades y destrezas en la producción agraria y en el manejo de especies de ecosistemas con ambientes naturales.

Optical design of the PEPSI high-resolution spectrograph at LBT

Science.gov (United States)

Andersen, Michael I.; Spano, Paolo; Woche, Manfred; Strassmeier, Klaus G.; Beckert, Erik

2004-09-01

PEPSI is a high-resolution, fiber fed echelle spectrograph with polarimetric capabilities for the LBT. In order to reach a maximum resolution R=120.000 in polarimetric mode and 300.000 in integral light mode with high efficiency in the spectral range 390-1050~nm, we designed a white-pupil configuration with Maksutov collimators. Light is dispersed by an R4 31.6 lines/mm monolithic echelle grating mosaic and split into two arms through dichroics. The two arms, optimized for the spectral range 390-550~nm and 550-1050~nm, respectively, consist of Maksutov transfer collimators, VPH-grism cross dispersers, optimized dioptric cameras and 7.5K x 7.5K 8~μ CCDs. Fibers of different core sizes coupled to different image-slicers allow a high throughput, comparable to that of direct feed instruments. The optical configuration with only spherical and cylindrical surfaces, except for one aspherical surface in each camera, reduces costs and guarantees high optical quality. PEPSI is under construction at AIP with first light expected in 2006.

An integral field spectrograph utilizing mirrorlet arrays

Science.gov (United States)

Chamberlin, Phillip C.; Gong, Qian

2016-09-01

An integral field spectrograph (IFS) has been developed that utilizes a new and novel optical design to observe two spatial dimensions simultaneously with one spectral dimension. This design employs an optical 2-D array of reflecting and focusing mirrorlets. This mirrorlet array is placed at the imaging plane of the front-end telescope to generate a 2-D array of tiny spots replacing what would be the slit in a traditional slit spectrometer design. After the mirrorlet in the optical path, a grating on a concave mirror surface will image the spot array and provide high-resolution spectrum for each spatial element at the same time; therefore, the IFS simultaneously obtains the 3-D data cube of two spatial and one spectral dimensions. The new mirrorlet technology is currently in-house and undergoing laboratory testing at NASA Goddard Space Flight Center. Section 1 describes traditional classes of instruments that are used in Heliophysics missions and a quick introduction to the new IFS design. Section 2 discusses the details of the most generic mirrorlet IFS, while section 3 presents test results of a lab-based instrument. An example application to a Heliophysics mission to study solar eruptive events in extreme ultraviolet wavelengths is presented in section 4 that has high spatial resolution (0.5 arc sec pixels) in the two spatial dimensions and high spectral resolution (66 mÅ) across a 15 Å spectral window. Section 4 also concludes with some other optical variations that could be employed on the more basic IFS for further capabilities of this type of instrument.

An Integral Field Spectrograph Utilizing Mirrorlet Arrays

Science.gov (United States)

Chamberlin, Phillip C.; Gong, Qian

2016-01-01

An integral field spectrograph (IFS) has been developed that utilizes a new and novel optical design to observe two spatial dimensions simultaneously with one spectral dimension. This design employs an optical 2-D array of reflecting and focusing mirrorlets. This mirrorlet array is placed at the imaging plane of the front-end telescope to generate a 2-D array of tiny spots replacing what would be the slit in a traditional slit spectrometer design. After the mirrorlet in the optical path, a grating on a concave mirror surface will image the spot array and provide high-resolution spectrum for each spatial element at the same time; therefore, the IFS simultaneously obtains the 3-D data cube of two spatial and one spectral dimensions. The new mirrorlet technology is currently in-house and undergoing laboratory testing at NASA Goddard Space Flight Center. Section 1 describes traditional classes of instruments that are used in Heliophysics missions and a quick introduction to the new IFS design. Section 2 discusses the details of the most generic mirrorlet IFS, while section 3 presents test results of a lab-based instrument. An example application to a Heliophysics mission to study solar eruptive events in extreme ultraviolet wavelengths is presented in section 4 that has high spatial resolution (0.5 arc sec pixels) in the two spatial dimensions and high spectral resolution (66 m) across a 15 spectral window. Section 4 also concludes with some other optical variations that could be employed on the more basic IFS for further capabilities of this type of instrument.

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain) on the South African Astronomical Observatory's 74-inch telescope

Science.gov (United States)

Crause, Lisa A.; Carter, Dave; Daniels, Alroy; Evans, Geoff; Fourie, Piet; Gilbank, David; Hendricks, Malcolm; Koorts, Willie; Lategan, Deon; Loubser, Egan; Mouries, Sharon; O'Connor, James E.; O'Donoghue, Darragh E.; Potter, Stephen; Sass, Craig; Sickafoose, Amanda A.; Stoffels, John; Swanevelder, Pieter; Titus, Keegan; van Gend, Carel; Visser, Martin; Worters, Hannah L.

2016-08-01

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain) is the extensively upgraded Cassegrain Spectrograph on the South African Astronomical Observatory's 74-inch (1.9-m) telescope. The inverse-Cassegrain collimator mirrors and woefully inefficient Maksutov-Cassegrain camera optics have been replaced, along with the CCD and SDSU controller. All moving mechanisms are now governed by a programmable logic controller, allowing remote configuration of the instrument via an intuitive new graphical user interface. The new collimator produces a larger beam to match the optically faster Folded-Schmidt camera design and nine surface-relief diffraction gratings offer various wavelength ranges and resolutions across the optical domain. The new camera optics (a fused silica Schmidt plate, a slotted fold flat and a spherically figured primary mirror, both Zerodur, and a fused silica field-flattener lens forming the cryostat window) reduce the camera's central obscuration to increase the instrument throughput. The physically larger and more sensitive CCD extends the available wavelength range; weak arc lines are now detectable down to 325 nm and the red end extends beyond one micron. A rear-of-slit viewing camera has streamlined the observing process by enabling accurate target placement on the slit and facilitating telescope focus optimisation. An interactive quick-look data reduction tool further enhances the user-friendliness of SpUpNI

Reduction of spectra exposed by the 700mm CCD camera of the Ondřejov telescope coudé spectrograph

Science.gov (United States)

Skoda, Petr; Slechta, Miroslav

We present a brief cook-book for the reduction of spectra exposed by the Ondřejov 2-meter telescope coudé spectrograph. For the data reduction, we use standard IRAF packages running on Solaris and Linux. The sequence of commands is given for the typical reduction session together with short explanation and detailed list of parameter settings. The reduction progress is illustrated by example plots.

Spectrographic determination of impurities in high-purity tantalum oxide and niobium oxide

International Nuclear Information System (INIS)

Anderson, S.T.G.; Russell, G.M.

1990-01-01

The development of spectrographic methods by direct current arc excitation and carrier distillation for the determination of impurities in tantalum and niobium oxides are described. Iron, silicon, aluminium, titanium, calcium, silver, tin, magnesium, and manganese can be determined in tantalum oxide and niobium oxide in concentrations ranging from 3 to 300 p.p.m. Niobium can be determined in tantalum oxide in concentrations ranging from 10 to 300 p.p.m. Tantalum cannot be determined in niobium oxide, and tungsten cannot be determined in either matrix as a result of the absence of sensitive lines in the spectra of these elements. Relative standard deviations of analyte element concentrations are in the region of 0,18 for tantalum oxide samples, and 0,13 for niobium oxide samples. A detailed laboratory method is included. 4 figs., 4 tabs., 3 refs

Mechanical time-shutter for spectrograph with exposure times from 1.5 {mu}s to 3 ms; Un obturateur mecanique pour spectrographe dont le temps d'exposition varie de 1,5 microseconde a 3 millisecondes

Energy Technology Data Exchange (ETDEWEB)

Becker, L; Drawin, H W [Commissariat a l' Energie Atomique, Association Euratom - CEA, Groupe de Recherches sur la Fusion Controlee, Fontenay-aux-Roses (France). Centre d' Etudes Nucleaires

1965-07-01

A mechanical time-shutter for exposure-times ranging from l,5 {mu}s to 3 ms is described. The apparatus is designed for spectrographic observations of pulsed electrical discharges which show rapidly varying spectral emissivities. For the mechanical part of the shutter we used a specially formed fast rotating disk having a slit. Triggering of the discharge is achieved by the rotating disk - in connection with photocells. Both the instant at which - after the beginning of the electrical discharge - the exposure shall begin, and the duration of exposure which will then follow can be 'preselected' on a special electronic control device. All functions: rotation of the disk - ignition of the discharge - exposure - switch-off of the disk are controlled electronically. The principle and the main electronic control parts of this versatile instrument are described. (authors) [French] On decrit un obturateur spectrographique rapide ayant des temps d'exposition allant de 1,5 {mu}s a 3 ms. L'obturateur est concu pour faire des observations spectrographiques de decharges pulsees dont l'emission spectrale varie rapidement. En ce qui concerne la partie mecanique nous avons utilise un disque comprenant une fente, qui tourne devant la fente d'entree du spectrographe. L'amorcage de la decharge est assure par le disque lui-meme, a l'aide de cellules photoelectriques. L'instant a partir duquel l'observation doit commencer - apres avoir amorce la decharge -, ainsi que la duree d'exposition qui suit, peuvent etre preselectionnes sur un tiroir electronique. Toutes les fonctions: mise en rotation du disque - amorcage de la decharge - exposition - freinage du disque se suivent automatiquement. Le principe ainsi que les circuits electroniques de controle de cet appareil sont decrits. (auteur)

Spectrographic measurement of beryllium in the atmosphere; Dosage spectrographique du beryllium dans l'atmosphere

Energy Technology Data Exchange (ETDEWEB)

Artaud, J; Cittanova, J [Commissariat a l' Energie Atomique, Service d' Analyses et Recherches Chimiques Appliquees, Saclay (France). Centre d' Etudes Nucleaires; Crehange, G; Frequelin, S [Commissariat a l' Energie Atomique, Dir. des Applications Militaires, Service Chimie, Saclay (France). Centre d' Etudes Nucleaires; Baudin, G [Commissariat a l' Energie Atomique, Grenoble (France). Centre d' Etudes Nucleaires

1961-07-01

We describe here a method for the spectrographic determination of beryllium on filters which is valid for amounts varying between 0,01 and 30 {mu}g of beryllium and which is independent of the nature of the beryllium compound involved. This is a flux method (graphite-lithium carbonate mixture), the excitation being by a direct current arc. (author) [French] Nous decrivons ici, une methode de dosage spectrographique de beryllium sur filtre, valable pour des teneurs comprises entre 0,01 et 30 {mu}g de beryllium et independante de la nature du compose de beryllium a doser. C'est une methode de 'flux' (melange graphite-carbonate de lithium) l'excitation etant un arc a courant continu. (auteur)

Development and construction of a focal-plane detector for the Munich Q3D spectrograph

International Nuclear Information System (INIS)

Lindner, H.

1989-01-01

For the Munich Q3D magnet spectrograph a focal-plane detector was developed, constructed, and taken in operation. It is primary layed out for light ions like p, d, t 3 He, and 4 He, but can be also applied for heavy ions. The position resolution amounts to about 0.1 mm at counting rates of about 10 kHz. In the detector filled with counting gas on anode wires along the focal plane charge avalanches are formed, which influence in several neighbouring cathode stripes of the dimension (3x25) mm 2 signals. These signals are singularily read out and digitized, i.e. to each of the at the whole 114 cathode strips is assigned an own preamplifier, puls shaper, peak detector, and analog-to-digital converter (ADC). After the digitization in a hardware-like constructed calculator unit the center of mass of the charge distribution influenced by the charge avalanche is calculated, the position of the incident particle is obtained. The detector yields beyond the position signal yet also a signal ΔE form the anode wires, which gives the energy loss of the particle in the gas space, as well as a residual-energy signal E rest from a scintillator, in which the particles are stopped. By this the radiation background (γ's and n) can be separated very well from the required particles. With the focal-plane detector the 103 Rh(d, p) 104 Rh transfer reaction was measured at three different spectrograph angles. The measured level energies and angular momentum transfers are compared with (n, γ) data and discussed. (orig.) [de

Determination of trace elements in uranium and aluminum by emission spectrographic methods

Energy Technology Data Exchange (ETDEWEB)

Chao, C N; Lee, S L; Tsai, H T

1976-07-01

Owing to its simplicity and sensitivity, emission spectrographic method is used to analyze the impurities in nuclear grade uranium rod and aluminum tubings for their strict specifications. With higher quantities of impurities, reactor fuel cladding, aluminum flow-tube, is analyzed by a.c. spark, point to plane method which is developed in quality control without damage for large scale samples. D.C. arc method, either carrier-distillation or without carrier, is developed to determine the limited impurities and it is especially good for analyzing irregular shaped samples. Both standard and sample are converted to oxide form and special standards matching sample matrix are not required. One of the requirements of good reactor fuel and sheathing materials is that, non-fission capture of neutrons by impurities should be held to a minimum. Some of the elements such as boron, cadmium, lithium and rare earths have very great absorption power. It has been shown by calculation that some of them should not exist more than a few parts per million or even a fraction of a part per million. Lithium seldom exists in uranium fuel rod and aluminum sheathing material and is not sought after; the determination of boron and cadmium are included in these reports. Among the carrier-distillation methods, mixture of 3 percent gallium oxide--graphite (2:1) carrier is used in uranium determination and 10 percent silver chloride--lithium fluoride (1:1) carrier is adoped in aluminum analysis. Analytical lines, concentration range and precision data are shown.

Study of the magnetic spectrograph BIG KARL on image errors and their causes

International Nuclear Information System (INIS)

Paul, D.

1987-12-01

The ionoptical aberrations of the QQDDQ spectrograph BIG KARL are measured and analyzed in order to improve resolution and transmission at large acceptance. The entrance phasespace is scanned in a cartesian grid by means of a narrow collimated beam of scattered deuterons. The distortions due to the nonlinear transformation by the system are measured in the detector plane. A model is developed which describes the measured distortions. The model allows to locate nonlinearities in the system responsible for the observed distortions. It gives a good understanding of geometrical nonlinearities up to the fifth order and chromatical nonlinearities up to the third order. To confirm the model, the magnetic field in the quadrupoles is measured including the fringe field region. Furthermore, nonlinearities appearing in ideal magnets are discussed and compared to experimental data. (orig.) [de

A technique using a stellar spectrographic plate to measure terrestrial ozone column depth

Energy Technology Data Exchange (ETDEWEB)

Wong, Alec Y. [Univ. of California, Berkeley, CA (United States)

1995-08-01

This thesis examines the feasibility of a technique to extract ozone column depths from photographic stellar spectra in the 5000--7000 Angstrom spectral region. A stellar spectrographic plate is measured to yield the relative intensity distribution of a star`s radiation after transmission through the earth`s atmosphere. The amount of stellar radiation absorbed by the ozone Chappuis band is proportional to the ozone column depth. The measured column depth is within 10% the mean monthly value for latitude 36{degree}N, however the uncertainty is too large to make the measurement useful. This thesis shows that a 10% improvement to the photographic sensitivity uncertainty can decrease the column depth uncertainty to a level acceptable for climatic study use. This technique offers the possibility of measuring past ozone column depths.

Fiber link design for the NASA-NSF extreme precision Doppler spectrograph concept "WISDOM"

Science.gov (United States)

Fżrész, Gábor; Pawluczyk, Rafal; Fournier, Paul; Simcoe, Robert; Woods, Deborah F.

2016-08-01

We describe the design of the fiber-optic coupling and light transfer system of the WISDOM (WIYN Spectrograph for DOppler Monitoring) instrument. As a next-generation Precision Radial Velocity (PRV) spectrometer, WISDOM incorporates lessons learned from HARPS about thermal, pressure, and gravity control, but also takes new measures to stabilize the spectrograph illumination, a subject that has been overlooked until recently. While fiber optic links provide more even illumination than a conventional slit, careful engineering of the interface is required to realize their full potential. Conventional round fiber core geometries have been used successfully in conjunction with optical double scramblers, but such systems still retain a memory of the input illumination that is visible in systems seeking sub-m/s PRV precision. Noncircular fibers, along with advanced optical scramblers, and careful optimization of the spectrograph optical system itself are therefore necessary to study Earth-sized planets. For WISDOM, we have developed such a state-of-the-art fiber link concept. Its design is driven primarily by PRV requirements, but it also manages to preserve high overall throughput. Light from the telescope is coupled into a set of six, 32 μm diameter octagonal core fibers, as high resolution is achieved via pupil slicing. The low-OH, step index, fused silica, FBPI-type fibers are custom designed for their numerical aperture that matches the convergence of the feeding beam and thus minimizes focal ratio degradation at the output. Given the demanding environment at the telescope the fiber end tips are mounted in a custom fused silica holder, providing a perfect thermal match. We used a novel process, chemically assisted photo etching, to manufacture this glass fiber holder. A single ball-lens scrambler is inserted into the 25m long fibers. Employing an anti-reflection (AR) coated, high index, cubic-zirconia ball lens the alignment of the scrambler components are

Aplicaciones de la teoría del control a la economía

Directory of Open Access Journals (Sweden)

Wolf Kerpel S.

1986-01-01

Full Text Available La teoría del control se ha desarrollado y aplicado ampliamente en muchas áreas de la Ingeniería. En los últimos años se ha venido aplicando también, en campos diferentes a los de la ingeniería como por ejemplo en Ecología, Economía, diversas áreas de Biología, Sicología, etc.; con excelentes resultados. Los éxitos conseguidos derivan entre otros del hecho de que dichos campos encierran procesos claramente identificables como de control, y, evidentemente también, del gran avance logrado en el desarrollo de la teoría del control. En este articulo nos ocuparemos de las aplicaciones de la teoría del control a la Economía, específicamente a los modelos macroeconómicos. El trabajo es básicamente una recopilación de información relacionada con el tema, y pretende despertar el interés por él en nuestro medio. Al final se presenta una bibliografía extensa.

Los composites. Caractetísticas y aplicaciones en la edificación

Directory of Open Access Journals (Sweden)

Roa Fernández, J.

2003-04-01

Full Text Available In this paper; the authors analyse composite materials from the point of view of their applications in the building construction field. An overview through the different distinctive aspects of composites is presented: concepts, types and characteristics of their components. Following, and from a practical point of view, advantages and disadvantages of the application of composites in construction are analysed. The article includes also a number of cases, real applications of these composite materials in the construction industry.En este artículo los autores analizan los materiales compuestos desde el punto de vista de sus aplicaciones en el campo de la construcción. Se realiza un recorrido por los diferentes aspectos definitorios de los mismos: conceptos, tipos y características de cada uno de sus componentes, para, a continuación, desde un punto de vista práctico, analizar las propiedades, ventajas e inconvenientes de su aplicación en la construcción arquitectónica. Finalmente, se completa el trabajo con una exposición de casos reales en los que han sido aplicados estos materiales en el mundo de la construcción.

Spectrographic determination of lithium in nuclear grade calcium; Determination spectrographique du lithium dans le calcium nucleaire

Energy Technology Data Exchange (ETDEWEB)

Artaud, J; Cittanova, J [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

1957-07-01

A method is described for the spectrographic determination of lithium in calcium. The samples are converted directly to CaCO{sub 3}. A method of fractional distillation in the arc, using KCl as carrier, makes it possible to detect and measure the Li content to 0,1 ppm. (author) [French] On decrit une methode de determination spectrographique de Li dans Ca. Les echantillons sont transformes d'une facon simple en CO{sub 3}Ca. Une methode de distillation fractionnee dans l'arc utilisant KCl comme entraineur permet la detection et le dosage de teneurs de Li jusqu'a 0,1 ppm. (auteur)

Analizar el aporte a las soluciones en aplicaciones móviles para el comercio electrónico en la ciudad de Quito

OpenAIRE

Vizuete Flores, Milton Renato

2012-01-01

Los antecedentes que podemos mencionar es el gran auge que ha tenido las comunicaciones móviles, desde hace varios años atrás comenzando con los primeros Smartphone’s con acceso a Internet muy básico y de muy poca utilidad pero siendo un pilar fundamental para el desarrollo de nuevas y mejores tecnologías móviles cada vez con mejores prestaciones hasta llegar a disponer de aplicaciones desarrolladas para equipos móviles que es el objeto de estudio de esta tesis, cuando una empresa dispone de ...

Calidad de vida para personas con discapacidad intelectual y otras discapacidades del desarrollo. Aplicaciones para personas, organizaciones, comunidades y sistemas. Serie: Feaps

OpenAIRE

Schalock, Robert L.; Gardner, James F.; Bradley, Valerie J.

2008-01-01

Las perspectivas de mejora de la calidad de vida de las personas con discapacidad intelectual y otras discapacidades del desarrollo han ido variando de forma continua desde los comienzos del movimiento en los primeros años de la década de los ochenta. Todos estos cambios de perspectiva han forzado una nueva estructura y mejora de los procesos de la calidad en el desarrollo del concepto, sus aplicaciones lógicas, mediciones y resultados. Este nuevo libro de la colección FEAPS es una traducción...

Propuesta de un modelo de negocio en base a la identificación y caracterización de los factores más influyentes en el crecimiento del sector de descargas de aplicaciones y juegos en dispositivos móviles entre universitarios de clase media – alta de Quito

OpenAIRE

Romero Bedón, Félix Alberto

2015-01-01

El propósito de la presente tesis es identificar y diseñar un modelo de negocio que permita aprovechar las oportunidades del mercado de descarga de aplicaciones y juegos en dispositivos móviles entre universitarios de clase media-alta de Quito en sistemas iOS y Android. Entre los propósitos específicos se encuentran el esquematizar la evolución de los dispositivos móviles y el mercado de aplicaciones y juegos. Analizar el mercado de los dispositivos móviles y las descargas de juegos y aplicac...

CRYSTALLINE SILICATES IN EVOLVED STARS. I. SPITZER/INFRARED SPECTROGRAPH SPECTROSCOPY OF IRAS 16456-3542, 18354-0638, AND 23239+5754

Energy Technology Data Exchange (ETDEWEB)

Jiang, B. W.; Zhang, Ke [Department of Astronomy, Beijing Normal University, Beijing 100875 (China); Li, Aigen [Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211 (United States); Lisse, C. M., E-mail: bjiang@bnu.edu.cn, E-mail: kzhang@caltech.edu, E-mail: lia@missouri.edu, E-mail: carey.lisse@jhuapl.edu [Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 (United States)

2013-03-01

We report the Spitzer Infrared Spectrograph (IRS) observations of three evolved stars: IRAS 16456-3542, 18354-0638, and 23239+5754. The 9.9-37.2 {mu}m Spitzer/IRS high-resolution spectra of these three sources exhibit rich sets of enstatite-dominated crystalline silicate emission features. IRAS 16456-3542 is extremely rich in crystalline silicates, with >90% of its silicate mass in crystalline form, the highest to date ever reported for crystalline silicate sources.

Células tronco mesenquimales: definiciones, cultivo y aplicaciones potenciales

Directory of Open Access Journals (Sweden)

Willy Ceron

Full Text Available En los últimos años, las células troncales mesenquimales (Mesenchymal Stem Cells, MSC han adquirido mucha importancia debido a su gran plasticidad y su capacidad de liberar factores paracrinos con capacidad de interactuar con diversos tipos celulares, tejidos y órganos. El uso de MSC en medicina regenerativa es importante debido a que, al no expresar las moléculas del complejo mayor de histocompatibilidad (MHC clase II ni moléculas co-estimuladoras y tener baja expresión del MHC clase I, haría que no sean rechazadas por individuos de la misma especie, es posible utilizarlas no sólo de manera autóloga, sino también, eventualmente, alogénica. Sin embargo, es importante demostrar científicamente muchas de sus propiedades, entre ellas las inmunomoduladoras. Al tener varias fuentes de obtención, se debe estandarizar la que sea la mejor para garantizar la pureza y calidad de las MSC. Finalmente, es importante que cuando se trabaje con estas células se demuestre completamente las características del cultivo celular, la inmunotipificación y su capacidad de diferenciación. Se están ensayando muchas aplicaciones clínicas de las MSC. Dentro de ellas, su capacidad para mejorar la recuperación y potencial curación de úlceras crónicas como las diabéticas, ha atraído la atención por su potencial impacto terapéutico.

Incorporation of a PbSe Array Based Spectrograph into EPICS using LabView at the JLab FEL Facility

International Nuclear Information System (INIS)

Hardy, D.; Benson, S.V.; Shinn, M.D.; Zhang, S.

2005-01-01

A real-time spectrograph with a 1Hz update rate was designed and installed at the JLab FEL facility using a Cal Sensors PbSe array and a Roper Scientific SpectraPro 300 monochrometer. This paper describes the implementation of EPICS channel access on a remote PC running LabView with modification of vendor supplied LabView VI's to allow display of FEL light spectra in real-time on a remote workstation. This allows PC based diagnostics to be used in EPICS

Radial Velocity Fiber-Fed Spectrographs Towards the Discovery of Compact Planets and Pulsations on M Stars

Science.gov (United States)

Berdiñas, Zaira M.

2016-11-01

This thesis is developed in the framework of the paradigm that seeks for the discovery of an Earth analog. Nowadays, low mass stars, and in particular M dwarf stars, are key targets towards achieving this goal. In this thesis, I focus on the study of the short-time domain of M dwarf stars with the aim of searching for short period planets, but also for the first detection of stellar pulsations on this spectral type. Both science goals are the primary objectives of the “Cool Tiny Beats” (CTB) survey, which has produced most of the data used in this thesis. CTB data consist in high resolution and high-cadence spectroscopic Doppler measurements taken either with HARPS or HARPS-N spectrographs. First of all, a thorough understanding of the spectrographs response in the short time domain was performed to characterize the sources of noise in our range of study. Our first approach to the goals of this thesis consisted in the design of an observational experiment to delve into the HARPS-N sub-night performance. Results unveiled variability of the spectra continuum correlated with instabilities of the spectrograph illumination associated to the airmass. Such distortions, which are wavelength and time dependent, are also present in at least one of the data-products given by the HARPS-N reduction software: the width of the mean-line profiles (i.e. the so-called FWHM index), an index commonly used as a proxy of the stellar activity. As a consequence, we searched for an alternative approach to measure the width index. In particular, we calculated the mean-line profile of the spectrum with a least-squares-deconvolution technique and we obtained the profile indices as the moments of the profile distribution. As part of this study, we also corroborated that the radial velocities calculated with our template matching algorithm TERRA are not affected by the illumination stability. This work unveiled a possible failure of the HARPS-N atmospheric dispersion corrector (or ADC) and

Propuesta de una Arquitectura y un Componente Genérico para Acceso a Bases de Datos en Aplicaciones Orientadas a Objetos

OpenAIRE

Molina Villa, Andreas

2000-01-01

Muchas aplicaciones requieren el acceso a información almacenada en bases de datos. En la actualidad las bases de datos más usadas son las bases de datos relaciónales, y los ambientes de desarrollo orientados a objetos son los que predominan en el mercado. Ambas tecnologías están basadas en paradigmas diferentes, lo que ocasiona que la comunicación e integración entre ambas sea difícil de lograr. En un desarrollo orientado a objetos con el uso de bases de datos relaciónales, gran parte del có...

Polímeros de Coordinación con Centros Metálicos en Entornos de Coordinación Variables: Posibles Aplicaciones.

OpenAIRE

Serrano Larrea, Edurne; Fernández de Luis, Roberto; Fidalgo Marijuan, Arkaitz; Llano Tomé, Francisco; Amayuelas López, Eder; Bravo García, Laura; Bazán Blau, Begoña del Pilar; Barandika Argoitia, Miren Gotzone; Urtiaga Greaves, Miren Karmele; Arriortua Marcaida, María Isabel

2015-01-01

Presentación de power point. Comunicación oral presentada en el 1er Simposium sobre Propiedades y Aplicaciones de MOFs y COFs, celebrado en Granada en abril de 2015 El grupo de investigación IMaCris/MaKrisI de la UPV/EHU, atesora una amplia experiencia en el estudio de estructuras metal-orgánicas en diferentes tipos de materiales: • Clústeres y polímeros de coordinación, con conectores magnéticos, como el aziduro, el cianato y el tiocianato, en combinación con ligandos bipiridínicos como l...

General Astrophysics Science Enabled by the HabEx Ultraviolet Spectrograph (UVS)

Science.gov (United States)

Scowen, Paul; Clarke, John; Gaudi, B. Scott; Kiessling, Alina; Martin, Stefan; Somerville, Rachel; Stern, Daniel; HabEx Science and Technology Definition Team

2018-01-01

The Habitable Exoplanet Imaging Mission (HabEx) is one of the four large mission concepts being studied by NASA as input to the upcoming 2020 Decadal Survey. The mission implements two world-class General Astrophysics instruments as part of its complement of instrumentation to enable compelling science using the 4m aperture. The Ultraviolet Spectrograph has been designed to address cutting edge far ultraviolet (FUV) science that has not been possible with the Hubble Space Telescope, and to open up a wide range of capabilities that will advance astrophysics as we look into the 2030s. Our poster discusses some of those science drivers and possible applications, which range from Solar System science, to nearby and more distant studies of star formation, to studies of the circumgalactic and intergalactic mediums where the ecology of mass and energy transfer are vital to understanding stellar and galactic evolution. We discuss the performance features of the instrument that include a large 3’x3’ field of view for multi-object spectroscopy, and some 20 grating modes for a variety of spectral resolution and coverage.

The assembly, calibration, and preliminary results from the Colorado high-resolution Echelle stellar spectrograph (CHESS)

Science.gov (United States)

Hoadley, Keri; France, Kevin; Nell, Nicholas; Kane, Robert; Schultz, Ted; Beasley, Matthew; Green, James; Kulow, Jen; Kersgaard, Eliot; Fleming, Brian

2014-07-01

The Colorado High-resolution Echelle Stellar Spectrograph (CHESS) is a far ultraviolet (FUV) rocket-borne experiment designed to study the atomic-to-molecular transitions within translucent interstellar clouds. CHESS is an objective echelle spectrograph operating at f/12.4 and resolving power of 120,000 over a band pass of 100 - 160 nm. The echelle flight grating is the product of a research and development project with LightSmyth Inc. and was coated at Goddard Space Flight Center (GSFC) with Al+LiF. It has an empirically-determined groove density of 71.67 grooves/mm. At the Center for Astrophysics and Space Astronomy (CASA) at the University of Colorado (CU), we measured the efficiencies of the peak and adjacent dispersion orders throughout the 90 - 165 nm band pass to characterize the behavior of the grating for pre-flight calibrations and to assess the scattered-light behavior. The crossdispersing grating, developed and ruled by Horiba Jobin-Yvon, is a holographically-ruled, low line density (351 grooves/mm), powered optic with a toroidal surface curvature. The CHESS cross-disperser was also coated at GSFC; Cr+Al+LiF was deposited to enhance far-UV efficiency. Results from final efficiency and reflectivity measurements of both optics are presented. We utilize a cross-strip anode microchannel plate (MCP) detector built by Sensor Sciences to achieve high resolution (25 μm spatial resolution) and data collection rates (~ 106 photons/second) over a large format (40mm round, digitized to 8k x 8k) for the first time in an astronomical sounding rocket flight. The CHESS instrument was successfully launched from White Sands Missile Range on 24 May 2014. We present pre-flight sensitivity, effective area calculations, lab spectra and calibration results, and touch on first results and post-flight calibration plans.

GEMINI NEAR INFRARED FIELD SPECTROGRAPH OBSERVATIONS OF THE SEYFERT 2 GALAXY MRK 573: IN SITU ACCELERATION OF IONIZED AND MOLECULAR GAS OFF FUELING FLOWS

Energy Technology Data Exchange (ETDEWEB)

Fischer, Travis C.; Straughn, A. N. [Astrophysics Science Division, Goddard Space Flight Center, Code 665, Greenbelt, MD 20771 (United States); Machuca, C.; Crenshaw, D. M.; Baron, F.; Revalski, M.; Pope, C. L. [Department of Physics and Astronomy, Georgia State University, Astronomy Offices, 25 Park Place, Suite 605, Atlanta, GA 30303 (United States); Diniz, M. R.; Riffel, R. A. [Departamento de Física, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS (Brazil); Kraemer, S. B. [Institute for Astrophysics and Computational Sciences, Department of Physics, The Catholic University of America, Washington, DC 20064 (United States); Schmitt, H. R. [Naval Research Laboratory, Washington, DC 20375 (United States); Storchi-Bergmann, T., E-mail: travis.c.fischer@nasa.gov [Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, IF, CP 15051, 91501-970 Porto Alegre, RS (Brazil)

2017-01-01

We present near-infrared and optical emission-line and stellar kinematics of the Seyfert 2 galaxy Mrk 573 using the Near-Infrared Field Spectrograph (NIFS) at Gemini North and Dual Imaging Spectrograph at Apache Point Observatory, respectively. By obtaining full kinematic maps of the infrared ionized and molecular gas and stellar kinematics in a ∼700 × 2100 pc{sup 2} circumnuclear region of Mrk 573, we find that kinematics within the Narrow-Line Region are largely due to a combination of both rotation and in situ acceleration of material originating in the host disk. Combining these observations with large-scale, optical long-slit spectroscopy that traces ionized gas emission out to several kpcs, we find that rotation kinematics dominate the majority of the gas. We find that outflowing gas extends to distances less than 1 kpc, suggesting that outflows in Seyfert galaxies may not be powerful enough to evacuate their entire bulges.

Gemini Near Infrared Field Spectrograph Observations of the Seyfert 2 Galaxy MRK 573: In Situ Acceleration of Ionized and Molecular Gas Off Fueling Flows

Science.gov (United States)

Fischer, Travis C.; Machuca, C.; Diniz, M. R.; Crenshaw, D. M.; Kraemer, S. B.; Riffel, R. A.; Schmitt, H. R.; Baron, F.; Storchi-Bergmann, T.; Straughn, A. N.;

Obtención y aplicaciones de hidrolizados protéicos

Directory of Open Access Journals (Sweden)

Millán, Francisco

2001-04-01

Full Text Available A review on the obtention of plant protein hydrolysates for food use has been carried out. First, the components and factors that participate in the hydrolysis are described. Then a description of the different types of hydrolysates is done: limited hydrolysates (between 1% and 10% degree of hydrolysis that are used to improve functional properties of foods; hydrolysates with variable degree of hydrolysis that are used as flavourings; by last, extensive hydrolysates (degree of hydrolysis above 10% that are used as protein suplement in the diet or with a defined composition for the treatment of specific illness.Se ha realizado una revisión de la obtención de hidrolizados proteicos de origen vegetal para su uso en alimentación humana. Se describe en primer lugar cuales son los componentes y factores que intervienen en dicha hidrólisis. A continuación se realiza una descripción de los distintos tipos de hidrolizados producidos y sus aplicaciones: hidrolizados limitados (entre el 1% y el 10% de grado de hidrólisis que son usados para mejorar las propiedades funcionales del alimento en cuestión; hidrolizados con grado de hidrólisis variable para ser usados como flavorizantes; por último, hidrolizados extensivos (con grado de hidrólisis superior al 10% que pueden ser usados como suplemento proteico en la dieta o con una composición definida para el tratamiento de enfermedades o síndromes específicos.

Aplicaciones innovadoras de la madera en la construcción

Directory of Open Access Journals (Sweden)

García Navarro, Justo

1996-12-01

Full Text Available The use of wooden products in construction has experienced significant changes during the last decades. New technologies have allowed to produce better and more predictable products for structural applications while have improved transformation processes to make more efficient use of the available raw resource. This paper describes current applications of new wooden materials uncommon in the Spanish construction. The Fundación Cultural COAM has channeled this information to designers in a number of seminars and courses during the last two years with special attention to the innovative applications.

La utilización de la madera como material de construcción ha sufrido un profundo cambio en el último medio siglo. Las nuevas tecnologías y procesos industriales han provocado, junto a la optimización de las características intrínsecas del material, un mejor aprovechamiento y utilización de la madera, tanto para usos estructurales como para usos no resistentes. Este artículo, que recoge algunos de los temas desarrollados en las distintas Jornadas y Cursos sobre Construcción en Madera, organizados por la Fundación Cultural COAM durante los últimos dos años, pretende hacer un repaso no exhaustivo a las diferentes aplicaciones del material, haciendo especial hincapié en los aspectos más innovadores que, por diversas circunstancias, no han sido, hasta la fecha, suficientemente utilizados en España.

Posicionamiento y proyección actual del motor de paso en aplicaciones industriales. // Position and proyection in actual industrial applications of stepping motors.

Directory of Open Access Journals (Sweden)

A. Codina García

2002-05-01

Full Text Available El presente trabajo aborda el empleo del motor de paso en las aplicaciones industriales actuales, los recientesavances y tendencias en la construcción de los mismos así como sus principales características y variantes másconocidas.Palabras claves: Motores de paso, control de movimiento.______________________________________________________________________Abstract.This paper focuses on the position of stepping motors in current industrial applications, recent advances andgeneral trends in design and manufacturing such motors. Their most outstanding features and different typesare also shown.Key words: Stepping motors, motion control.

The LUVOIR Ultraviolet Multi-Object Spectrograph (LUMOS): instrument definition and design

Science.gov (United States)

France, Kevin; Fleming, Brian; West, Garrett; McCandliss, Stephan R.; Bolcar, Matthew R.; Harris, Walter; Moustakas, Leonidas; O'Meara, John M.; Pascucci, Ilaria; Rigby, Jane; Schiminovich, David; Tumlinson, Jason

2017-08-01

The Large Ultraviolet/Optical/Infrared Surveyor (LUVOIR) is one of four large mission concepts currently undergoing community study for consideration by the 2020 Astronomy and Astrophysics Decadal Survey. LUVOIR is being designed to pursue an ambitious program of exoplanetary discovery and characterization, cosmic origins astrophysics, and planetary science. The LUVOIR study team is investigating two large telescope apertures (9- and 15-meter primary mirror diameters) and a host of science instruments to carry out the primary mission goals. Many of the exoplanet, cosmic origins, and planetary science goals of LUVOIR require high-throughput, imaging spectroscopy at ultraviolet (100 - 400 nm) wavelengths. The LUVOIR Ultraviolet Multi-Object Spectrograph, LUMOS, is being designed to support all of the UV science requirements of LUVOIR, from exoplanet host star characterization to tomography of circumgalactic halos to water plumes on outer solar system satellites. LUMOS offers point source and multi-object spectroscopy across the UV bandpass, with multiple resolution modes to support different science goals. The instrument will provide low (R = 8,000 - 18,000) and medium (R = 30,000 - 65,000) resolution modes across the far-ultraviolet (FUV: 100 - 200 nm) and nearultraviolet (NUV: 200 - 400 nm) windows, and a very low resolution mode (R = 500) for spectroscopic investigations of extremely faint objects in the FUV. Imaging spectroscopy will be accomplished over a 3 × 1.6 arcminute field-of-view by employing holographically-ruled diffraction gratings to control optical aberrations, microshutter arrays (MSA) built on the heritage of the Near Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST), advanced optical coatings for high-throughput in the FUV, and next generation large-format photon-counting detectors. The spectroscopic capabilities of LUMOS are augmented by an FUV imaging channel (100 - 200nm, 13 milliarcsecond angular resolution, 2 × 2

APLICACIONES PARA REDES VANET ENFOCADAS EN LA SOSTENIBILIDAD AMBIENTAL, UNA REVISIÓN SISTEMÁTICA

Directory of Open Access Journals (Sweden)

Oscar Orozco Sarasti

2014-01-01

Full Text Available La alta demanda de energía en sectores clave de la productividad incita a una búsqueda permanente de nuevas formas de utilizar los recursos naturales no renovables, que contribuya al mejoramiento de aspectos como sostenibilidad y eficiencia. Los Sistemas Inteligentes de Transporte Verdes buscan el mejoramiento de la movilidad, la reducción de la accidentalidad y la mitigación del impacto ambiental mediante la gestión inteligente del tráfico vehicular a través de las Tecnologías de la Información y las Comunicaciones (TIC. Este artículo presenta una revisión de las Redes Vehiculares Ad hoc (VANET, sus características y enfoques, además de la clasificación de sus aplicaciones, los modelos de movilidad utilizados, y una caracterización para el modelado del tráfico vehicular, junto con sus particularidades, en Colombia. Se concluye con la tendencia actual de simulación y el desarrollo futuro del proyecto de investigación.

The lick-index calibration of the Gemini multi-object spectrographs

International Nuclear Information System (INIS)

Puzia, Thomas H.; Miller, Bryan W.; Trancho, Gelys; Basarab, Brett; Mirocha, Jordan T.; Butler, Karen

2013-01-01

We present the calibration of the spectroscopic Lick/IDS standard line-index system for measurements obtained with the Gemini Multi-Object Spectrographs known as GMOS-North and GMOS-South. We provide linear correction functions for each of the 25 standard Lick line indices for the B600 grism and two instrumental setups, one with 0.''5 slit width and 1 × 1 CCD pixel binning (corresponding to ∼2.5 Å spectral resolution) and the other with 0.''75 slit width and 2 × 2 binning (∼4 Å). We find small and well-defined correction terms for the set of Balmer indices Hβ, Hγ A , and Hδ A along with the metallicity sensitive indices Fe5015, Fe5270, Fe5335, Fe5406, Mg 2 , and Mgb that are widely used for stellar population diagnostics of distant stellar systems. We find other indices that sample molecular absorption bands, such as TiO 1 and TiO 2 , with very wide wavelength coverage or indices that sample very weak molecular and atomic absorption features, such as Mg 1 , as well as indices with particularly narrow passband definitions, such as Fe4384, Ca4455, Fe4531, Ca4227, and Fe5782, which are less robustly calibrated. These indices should be used with caution.

Study of the efficiency of AgCl, In2O3, Ga2O3, NaF, LiF and SrF2 as spectrographic carriers in the quantitative analysis of eighteen microcompound elements in uranium

International Nuclear Information System (INIS)

Gomes, R.P.; Lordello, A.R.; Abrao, A.

1977-01-01

A comparative study of the efficiency of some spectrochemical carriers (AgCl, In 2 O 3 , Ga 2 O 3 , NaF, LiF and SrF 2 ) is presented for the quantitative spectrographic analysis of Ag, Al, B, Bi, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Ni, P, Pb, Si, Sn, V and Zn in uranium and its compounds. The volatility behaviour of the eighteen elements was verified by means of the moving plate technique for each of the mentioned carriers. The final aim was the selection of the carriers for the determination of trace amounts of the impurities. The best results were obtained with 4% In 2 O 3 , 6% AgCl and 6% NaF in a U 3 O 8 matrix. The sensitivities for some elements were extended to fractions of p.p.m. The precision, accuracy and acceptability of the method were calculated for all elements. The total error values are approximately in the range of 16-45% [pt

Elementos mínimos que debe incluir un plan de marketing digital. Una investigación sobre los elementos, conceptos y aplicaciones disponibles para complementar un plan de mercadeo tradicional, parte 2: verificar las clases de aplicaciones que se deberían utilizar y las que actualmente se aplican en las estrategias del mercadeo digital

OpenAIRE

2013-01-01

El desarrollo del internet como un “nuevo” medio de comunicación se traducirá en un cambio de poder de los consumidores y en importantes modificaciones en los canales de ventas tradicionales hacia los consumidores. Esto genera unas nuevas reglas de juego en el mercadeo, al crearse la necesidad de incorporar la parte digital en la forma de contactar a los consumidores. El objetivo de la investigación es explorar, describir y detallar las aplicaciones, técnicas y herramientas de E-marketing que...

The photo refractive polymers, physics and photonic applications of these new materials; Los polimeros fotorrefractivos, fisica y aplicaciones fotonicas de estos nuevos materiales

Energy Technology Data Exchange (ETDEWEB)

Maldonado, J. L. [Centro de Investigacion en Optica, Leon, Guanajuato (Mexico); Garcia M, J. [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

2001-12-01

This paper is a review about the new photo refractive organic materials and their potential photonic applications, the photo refractive polymers. The physical properties required for observing photo refractivity, including charge generation, transport, and nonlinear optical properties are discussed for amorphous polymers. The nonlinear optical properties on a macroscopic level are related to the microscopic properties by using the Oriented Gas model. Four Wave Mixing (FWM) and Two Beam Coupling (TBC) experiments, to investigate the photo refractive properties of the material by measuring the diffraction efficiency {eta} of the polymeric gratings, and the optical gain coefficient {eta} are described. Kogelnik's Coupled Wave model to describe the photo refractive polymeric gratings is reviewed. Finally some applications of these new polymers are presented. [Spanish] Este articulo es una revision sobre los nuevos materiales organicos fotorrrefractivos y sus potenciales aplicaciones fotonicas: los polimeros fotorrefractivos. Se discuten las propiedades fisicas requeridas para observar fotorrefractividad, incluyendo la generacion de cargas, el transporte y las propiedades opticas no lineales en polimeros amorfos. Usando el modelo de gas orientado, se muestra como se relacionan las propiedades opticas no lineales a nivel marcoscopico con las propiedades microscopicas. Se describen los experimentos de mezcla de cuatro ondas (FWM) y dos ondas (TBC) para investigar las propiedades fotorrefractivas del material, midiendo la eficiencia de difraccion {eta} de las rejillas polimericas y el coeficiente de ganancia optica {eta}. Se revisa el modelo de ondas acopladas de Kogelnik para describir las rejillas polimericas fotorrefractivas. Finalmente se presentan algunas aplicaciones de estos nuevos polimeros.

The third flight of the Colorado high-resolution echelle stellar spectrograph (CHESS): improvements, calibrations, and preliminary results

Science.gov (United States)

Kruczek, Nicholas; Nell, Nicholas; France, Kevin; Hoadley, Keri; Fleming, Brian; Kane, Robert; Ulrich, Stefan; Egan, Arika; Beatty, Dawson

2017-08-01

In this proceeding, we describe the scientific motivation and technical development of the Colorado HighResolution Echelle Stellar Spectrograph (CHESS), focusing on the hardware advancements and testing of components for the third launch of the payload (CHESS-3). CHESS is a far ultraviolet rocket-borne instrument designed to study the atomic-to-molecular transitions within translucent cloud regions in the interstellar medium. CHESS is an objective echelle spectrograph, which uses a mechanically-ruled echelle and a powered (f/12.4) crossdispersing grating, and is designed to achieve a resolving power R > 100,000 over the bandpass λλ 1000-1600 Å. Results from final efficiency and reflectivity measurements for the optical components of CHESS-3 are presented. An important role of sounding rocket experiments is the testing and verification of the space flight capabilities of experimental technologies. CHESS-3 utilizes a 40mm-diameter cross-strip anode microchannel plate detector fabricated by Sensor Sciences LLC, capable of achieving high spatial resolution and a high global count rate (˜1 MHz). We present pre-flight laboratory spectra and calibration results, including wavelength solution and resolving power of the instrument. The fourth launch of CHESS (CHESS-4) will demonstrate a δ-doped CCD, assembled in collaboration with the Microdevices Laboratory at JPL and Arizona State University. In support of CHESS-4, the CHESS-3 payload included a photomultiplier tube, used as a secondary confirmation of the optical alignment of the payload during flight. CHESS-3 launched on 26 June 2017 aboard NASA/CU sounding rocket mission 36.323 UG. We present initial flight results for the CHESS-3 observation of the β1 Scorpii sightline.

Calibration Efforts and Unique Capabilities of the HST Space Telescope Imaging Spectrograph

Science.gov (United States)

Monroe, TalaWanda R.; Proffitt, Charles R.; Welty, Daniel; Branton, Doug; Carlberg, Joleen K.; debes, John Henry; Lockwood, Sean; Riley, Allyssa; Sohn, Sangmo Tony; Sonnentrucker, Paule G.; Walborn, Nolan R.; Jedrzejewski, Robert I.

2018-01-01

The Space Telescope Imaging Spectrograph (STIS) continues to offer the astronomy community the ability to carry out innovative UV and optical spectroscopic and imaging studies, two decades after its deployment on the Hubble Space Telescope (HST). Most notably, STIS provides spectroscopy in the FUV and NUV, including high spectral resolution echelle modes, imaging in the FUV, optical spectroscopy, and coronagraphic capabilities. Additionally, spatial scanning on the CCD with the long-slits is now possible to enable very high S/N spectroscopic observations without saturation while mitigating telluric and fringing concerns in the far red and near-IR. This new mode may especially benefit the diffuse interstellar bands and exoplanet transiting communities. We present recent calibration efforts for the instrument, including work to optimize the calibration of the echelle spectroscopic modes by improving the flux agreement of overlapping spectral orders affected by changes in the grating blaze function since HST Servicing Mission 4. We also discuss considerations to maintain the wavelength precision of the spectroscopic modes, and the current capabilities of CCD spectroscopic spatial trails.

Spectro-photometric calibration of the SuperNova Integral Field Spectrograph in the Nearby Supernova Factory collaboration framework

International Nuclear Information System (INIS)

Buton, Clement

2009-01-01

Ten years ago, type Ia supernovae used as distances indicators led to the discovery of the accelerating expansion of the universe. Today, a second generation of surveys has significantly increased the high-redshift type Ia supernovae sample. The low-redshift sample was however still limiting the cosmological analysis using SNe. In this framework, the Nearby Supernova Factory has followed 200 nearby type Ia supernovae using the dedicated Supernovae Integral Field Spectrograph with spectro-photometric capacities. My PhD thesis has been carried out at the Institut de Physique Nucleaire de Lyon and at the Lawrence Berkeley National Laboratory in the framework of the international cosmological project SNfactory. In order to reach the design spectrophotometric accuracy, attention has been focused on several key aspects of the calibration procedure, including: determination of a dedicated point spread function for 3D point source extraction, estimating the nightly photometric quality, derivation of the nightly sky extinction over the extended optical domain, its modeling in terms of physical components and its variability within a given night. A full multi-standards calibration pipeline has been implemented using approximately 4000 observations of spectrophotometric standard stars taken throughout the night over nearly 500 individual nights. Preliminary scientific results of the whole SNfactory collaboration will be presented at the end of this thesis. (author)

Nanopartículas de plata con potenciales aplicaciones en materiales implantables: síntesis, caracterización fisicoquímica y actividad bactericida

OpenAIRE

Flores, Constanza Y.

2014-01-01

El objetivo general del presente Trabajo de Tesis fue la preparación y caracterización de superficies sólidas modificadas con nanopartículas de plata con potenciales aplicaciones en Biomedicina. Para esto se optimizó el método de síntesis de nanopartículas de plata (NPs Ag) recubiertas con citrato, obteniendo NPs Ag monodispersas de 6 ± 2 nm de diámetro recubiertas con citrato y estables en medios acuosos. Asimismo, se estudió la inmovilización de estas NPs Ag sobre superficies de Ti/TiO2, en...

Spectrographic determination of impurities in enriched uranium solutions; Determinacion espectrografica de impurezas en soluciones de uranio enriquecido

Energy Technology Data Exchange (ETDEWEB)

Capdevila, C; Roca, M

1980-07-01

A spectrographic procedure for the determination of trace amounts of Al, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, K, L i , Hg, Mn, Mo, Na, Nb, Ni, P, Pb, Ru, Sb, Sn, Sr, Ti, V, Zn, and Zr in enriched uranyl nitrate solutions from the reprocessing of spent nuclear fuels is described. After removal of uranium by either TBP or TNOA solvent extraction, the aqueous phase Is analysed by the graphite spark technique. TBP is adequate for all impurities, excepting boron and phosphorus; both of these elements can sat is factory be determined by using TNOA after the addition of mannitol to avoid boron losses. (Author) 4 refs.

Space Telescope and Optical Reverberation Mapping Project.I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope

NARCIS (Netherlands)

De Rosa, G.; Peterson, B.M.; Ely, J.; Kriss, G.A.; Crenshaw, D.M.; Horne, K.; Korista, K.T.; Netzer, H.; Pogge, R.W.; Arévalo, P.; Barth, A.J.; Bentz, M.C.; Brandt, W.N.; Breeveld, A.A.; Brewer, B.J.; Dalla Bontà, E.; De Lorenzo-Cáceres, A.; Denney, K.D.; Dietrich, M.; Edelson, R.; Evans, P.A.; Fausnaugh, M.M.; Gehrels, N.; Gelbord, J.M.; Goad, M.R.; Grier, C.J.; Grupe, D.; Hall, P.B.; Kaastra, J.; Kelly, B.C.; Kennea, J.A.; Kochanek, C.S.; Lira, P.; Mathur, S.; McHardy, I.M.; Nousek, J.A.; Pancoast, A.; Papadakis, I.; Pei, L.; Schimoia, J.S.; Siegel, M.; Starkey, D.; Treu, T.; Uttley, P.; Vaughan, S.; Vestergaard, M.; Villforth, C.; Yan, H.; Young, S.; Zu, Y.

2015-01-01

We describe the first results from a six-month long reverberation-mapping experiment in the ultraviolet based on 171 observations of the Seyfert 1 galaxy NGC 5548 with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Significant correlated variability is found in the continuum and

15x optical zoom and extreme optical image stabilisation: diffraction limited integral field spectroscopy with the Oxford SWIFT spectrograph

OpenAIRE

Tecza, Matthias; Thatte, Niranjan; Clarke, Fraser; Lynn, James; Freeman, David; Roberts, Jennifer; Dekany, Richard

2012-01-01

When commissioned in November 2008 at the Palomar 200 inch Hale Telescope, the Oxford SWIFT I and z band integral field spectrograph, fed by the adaptive optics system PALAO, provided a wide (3×) range of spatial resolutions: three plate scales of 235 mas, 160 mas, and 80 mas per spaxel over a contiguous field-of-view of 89×44 pixels. Depending on observing conditions and guide star brightness we can choose a seeing limited scale of 235 mas per spaxel, or 160 mas and 80 mas per spaxel for ver...

Fundamentos y aplicaciones del diseño de casos cruzados Case-crossover design: Basic essentials and applications

Directory of Open Access Journals (Sweden)

Eduardo Carracedo-Martínez

2009-04-01

Full Text Available El diseño de casos cruzados es un diseño epidemiológico observacional propuesto por Maclure en 1991 para valorar si alguna exposición intermitente o inusual ha desencadenado un evento agudo a muy corto plazo. En este trabajo se presentan los fundamentos de los diseños de casos cruzados, con sus aplicaciones y limitaciones. El diseño de casos cruzados se basa en seleccionar sólo sujetos caso. Para calcular el riesgo relativo se compara la exposición durante el periodo de tiempo previo al evento (periodo caso con la exposición del mismo sujeto en uno o varios periodos control. Este método únicamente es adecuado cuando las exposiciones son cambiantes en el tiempo, con efectos a corto plazo, y el efecto es agudo. Para exposiciones en que no existe tendencia, el planteamiento unidireccional es el más frecuente, y consiste en seleccionar uno o varios periodos control previos al momento caso. Cuando la exposición tiene una tendencia temporal (por ejemplo las de contaminación atmosférica, el planteamiento unidireccional proporciona estimaciones sesgadas, por lo que se utilizan diseños de casos cruzados bidireccionales, que seleccionan periodos de tiempo control anteriores y posteriores al del evento. Es un método que cuenta con una creciente utilización en amplios campos: desencadenantes de accidentes de tráfico, laborales y domésticos, o de infarto agudo de miocardio, contaminación atmosférica y salud, farmacoepidemiología, etc. Para el análisis de datos, generalmente se pueden considerar los diseños de casos cruzados como estudios de casos y controles emparejados, por lo que se aplica regresión logística condicional. Finalmente, en este trabajo se analizan ejemplos prácticos de diferentes aplicaciones del diseño de casos cruzados.Case-crossover analysis is an observational epidemiological design that was proposed by Maclure in 1991 to assess whether a given intermittent or unusual exposure may have triggered an immediate

Analysis of pumping systems to large flows of cooling water in power plants; Analisis de sistemas de bombeo para grandes flujos de agua de enfriamiento en centrales termoelectricas

Energy Technology Data Exchange (ETDEWEB)

Sanchez Sanchez, Ramon; Herrera Velarde, Jose Ramon; Gonzalez Sanchez, Angel [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: rsanchez@iie.org.mx; jrhv@iie.org.mx; ags@iie.org.mx

2010-11-15

Accurate measurement of large water flows remains being a challenge in the problems of implementation of circulating water systems of power plants and other applications. This paper, presents a methodology for the analysis in pumping systems with high rates of water in power plants, as well as their practical application and results in pipelines water flow of a thermoelectrical power plant of 350 MW. In this power plant, the water flow per pipeline for a half of condenser oscillates around 7 m{sup 3}/s (14 m{sup 3}/s per power generating unit). In this analysis, we present the techniques used to measure large flows of water with high accurately, as well as the computational model for water circulating system using PIPE FLO and the results of practical application techniques. [Spanish] La medicion precisa de grandes flujos de agua, sigue siendo un reto en los problemas de aplicacion de sistemas de agua de circulacion de centrales termoelectricas, entre otras aplicaciones. En este articulo, se presenta una metodologia para el analisis de sistemas de bombeo con grandes flujos de agua en centrales termoelectricas, asi como, su aplicacion practica y los resultados obtenidos en los ductos de agua de circulacion de una central generadora con unidades de 350 MW. En esta central, los flujos por caja de agua oscilan alrededor de los 7 m{sup 3}/s (14 m{sup 3}/s por unidad generadora). En el analisis, se presentan las tecnicas utilizadas para medir con precision grandes flujos de agua (tubo de Pitot), asi como, el modelado del sistema de agua de circulacion por medio de un paquete computacional (PIPE FLO) y resultados obtenidos de la aplicacion de dichas tecnicas.

Energy saving by means of air conditioning equipment replacement and the household application of thermal insulation; Ahorro de energia electrica por reemplazo de equipos de aire acondicionado y aplicacion de aislamiento termico en viviendas

Energy Technology Data Exchange (ETDEWEB)

Peralta Solorio, Jose Luis [Fideicomiso para el Ahorro de la Energia (Mexico)

2005-07-15

An extension study of the Financing Program for Energy Saving looked for the evaluation of the electric energy saving potential obtained by the replacement of air conditioning equipment and the application of thermal insulation in 30 houses of two Mexican cities with warmth climate. In a joint effort with Comision Federal de Electricidad the consumption files of the users were analyzed and field measurements of electric demand and of refrigeration were made. As a following step the change of the refrigeration necessities derived from the application of thermal insulation were evaluated as well as the energy efficiency improvement obtained by the substitution of the air conditioning equipment and the favorable results obtained by the implementation of both measures - thermal insulation and change of air conditioning equipment in a joint form. This way, as a conclusion, the optimum sequence of application of these measures is revealed. [Spanish] Un estudio extension del Programa de Financiamiento para el Ahorro de Energia Electrica busco evaluar el potencial de ahorro de energia electrica alcanzado por el reemplazo de equipos de aire acondicionado y la aplicacion de aislamiento termico en 30 viviendas de dos ciudades mexicanas con clima calido. En un esfuerzo conjunto con la Comision Federal de Electricidad se analizaron los historiales de consumo de los usuarios y se efectuaron las mediciones de campo de demanda electrica y de refrigeracion. Como paso siguiente se valoro el cambio en las necesidades de refrigeracion derivado de la aplicacion de aislamiento termico al igual que la mejora en eficiencia energetica obtenida por la sustitucion de aire acondicionado y se identificaron los resultados favorecedores arrojados por la implementacion de ambas medidas -aislamiento termico y cambio de equipo de aire acondicionado- en forma conjunta. De esta manera, como conclusion, se devela la mas optima secuencia de aplicacion de estas medidas.

La traducció automàtica en la pràctica: aplicacions, dificultats i estratègies de desenvolupament

Directory of Open Access Journals (Sweden)

Mireia Ginestí Rossell

2014-04-01

Full Text Available En aquest article es descriuen els sistemes de traducció automàtica, les seves aplicacions actuals i les principals dificultats que ha d’afrontar aquesta tecnologia lingüística. Es presenta el sistema Apertium, una plataforma de traducció automàtica de codi obert sobre la qual s’han construït diversos traductors automàtics entre diferents parells d’idiomes, en els quals està inclòs el català. Basant-se en l’experiència dels autors, es descriuen algunes tensions que es donen en el desenvolupament de les dades lingüístiques d’un traductor automàtic i les solucions de compromís a què cal arribar per a construir sistemes útils.

GALACTIC-SCALE ABSORPTION OUTFLOW IN THE LOW-LUMINOSITY QUASAR IRAS F04250-5718: HUBBLE SPACE TELESCOPE/COSMIC ORIGINS SPECTROGRAPH OBSERVATIONS

International Nuclear Information System (INIS)

Edmonds, Doug; Borguet, Benoit; Arav, Nahum; Dunn, Jay P.; Penton, Steve; Kriss, Gerard A.; Korista, Kirk; Bautista, Manuel; Costantini, Elisa; Kaastra, Jelle; Steenbrugge, Katrien; Ignacio Gonzalez-Serrano, J.; Benn, Chris; Aoki, Kentaro; Behar, Ehud; Micheal Crenshaw, D.; Everett, John; Gabel, Jack; Moe, Maxwell; Scott, Jennifer

2011-01-01

We present absorption line analysis of the outflow in the quasar IRAS F04250-5718. Far-ultraviolet data from the Cosmic Origins Spectrograph on board the Hubble Space Telescope reveal intrinsic narrow absorption lines from high ionization ions (e.g., C IV, N V, and O VI) as well as low ionization ions (e.g., C II and Si III). We identify three kinematic components with central velocities ranging from ∼-50 to ∼-230 km s -1 . Velocity-dependent, non-black saturation is evident from the line profiles of the high ionization ions. From the non-detection of absorption from a metastable level of C II, we are able to determine that the electron number density in the main component of the outflow is ∼ -3 . Photoionization analysis yields an ionization parameter log U H ∼ -1.6 ± 0.2, which accounts for changes in the metallicity of the outflow and the shape of the incident spectrum. We also consider solutions with two ionization parameters. If the ionization structure of the outflow is due to photoionization by the active galactic nucleus, we determine that the distance to this component from the central source is ∼>3 kpc. Due to the large distance determined for the main kinematic component, we discuss the possibility that this outflow is part of a galactic wind.

Aplicaciones del equipo automático de difracción de polvo marca Philips modelo PW-1700 instalado en el Instituto "Eduardo Torroja" de la construcción y del cemento

Directory of Open Access Journals (Sweden)

Sagrera, José Luis

1984-12-01

Full Text Available In this article, the author has the purpose to give a general view of the applications of the automatic equipment of X ray diffraction purchased by the I.E.T.c.c., quoting the main software programs used by the team in its qualitative, quantitative and crystallographic analysis, as well as to give a simplified account of the data that can be obtained from de computer storage.

El autor pretende, en este artículo, dar una visión general de las aplicaciones del equipo automático de difracción de rayos X adquirido por el I.E.T.c.c., citando los principales programas del software que utiliza el equipo en sus análisis cualitativos, cuantitativos y cristalográficos, además de una relación simplificada de datos que pueden obtenerse de la memoria del ordenador.

The spectrographic determination of minor and trace elements in copper, lead, and zinc concentrates

International Nuclear Information System (INIS)

Breckenridge, R.L.; Russell, G.M.; Watson, A.E.

1976-01-01

This report deals with the development of a method for the determination, by an emission-spectrographic technique, of magnesium, manganese, aluminium, silver, calcium, chromium, cobalt, titanium, antimony, cadmium, molybdenum, zirconium, nickel, boron, vanadium, arsenic, beryllium, tin, germanium, and bismuth in copper, lead, and zinc sulphide concentrates. The method involves the preparation of complex standards in which the volatile elements arsenic, antimony, cadmium, tin, and bismuth are incorporated as sulphide compounds at temperatures of 800 degrees Celsius in evacuated silica tubes together with a synthetic sulphide matrix. These standards are then mixed with the other minor and trace elements to form composite standards. The conditions for excitation with a direct-current arc, and the analytical lines for the elements and internal standards, are given. The procedure is rapid and convenient, and involves the minimum of sample preparation. The accuracy is about 10 per cent, and the method has a coefficient of variation for the various elements of between 2 and 13 per cent

Desarrollo de materiales poliméricos nanocompuestos para aplicaciones eléctricas y electrónicas

Directory of Open Access Journals (Sweden)

Bruno Chinè

2007-05-01

Full Text Available Se reportan algunos resultados y procedimientos experimentales de laboratorio obtenidos en el marco de investigaciones desarrolladas para la obtención de nuevos materiales compuestosnanoestructurados. Estos nuevos materiales, formados por una fase orgánica el polímero y una fase inorgánica el silicato, están siendo fuertemente investigados en la actualidad pues se espera que puedan brindar, entre otras, mejores propiedades de aislamiento eléctrico y de retardo a la flama en aplicaciones eléctricas y electrónicas. El trabajo experimental de laboratorio ha sido desarrollado a partir de dos familias de polímeros, los termoplásticos y los termoestables y de las arcillas que proporcionan los silicatos de tipo lamelar. Se cuenta ya con algunos resultados preliminares, como son la obtención de películas delgadas de estos materiales nanocompuestos, su completa caracterización mediante difractometría de rayos X, microscopía de barrido y análisistermogravimétrico, que hacen bien esperar para futuras actividades de investigación.

Automated Recognition of Bioacoustic Signals: a Review of Methods and Applications Reconocimiento automatizado de señales bioacústicas: Una revisión de métodos y aplicaciones

Directory of Open Access Journals (Sweden)

Paula Catalina Caycedo-Rosales

2013-11-01

Full Text Available During the past decade, numerous research studies and applications on automated bioacoustic monitoring have been published; however, such studies are scattered in the literature of engineering and life sciences. This paper presents a review on fundamental concepts of automated acoustic monitoring. Our aim is to compare and categorize —in a taxonomy of techniques DSP/PR— the contributions of published research studies and applications; in order to suggest some directions for future research and highlight challenges and opportunities related to the deployment of this technology in Colombia.Durante la última década se ha publicado una gran cantidad de estudios de investigación y aplicaciones sobre monitoreo bioacústico automatizado. No obstante, tales estudios están dispersos en la literatura de ingeniería y ciencias biológicas. En este artículo se presentan conceptos fundamentales sobre monitoreo bioacústico automatizado; se revisan, comparan y categorizan —en una taxonomía de técnicas de DSP/PR— las contribuciones de las investigaciones y las aplicaciones publicadas; se sugieren algunas direcciones para investigaciones futuras y se resaltan los retos y las oportunidades relacionados con la instalación de esta tecnología en Colombia.

The application of computers to the processing of data in spectrographic analysis; Aplicacion de la informatica al tratamiento de datos en el analisis espectrografico

Energy Technology Data Exchange (ETDEWEB)

Rucandio, M. I.; Roca, M.

1988-07-01

Two mutually connected programs have been written in BASIC language for performing the following tasks: 1) Calibration of the photographic emulsion by the two step procedure, being obtained by the least squares fit method both the preliminary curve and the calibration curve (the latter in polynomial steps of first to third degree). 2) Establishment, also in polynomial steps, of the working curve for each element and calculation of the corresponding concentrations in the samples, being used the calibration equations obtained and stored by the preceding program for converting the transmittances to intensities. (Author) 6 refs.

Evaluación de hidrogeles para aplicaciones agroforestales

Directory of Open Access Journals (Sweden)

Andrés Barón Cortés

2007-09-01

Full Text Available Con hidrogeles sintetizados por medio de la técnica de polimerización en suspensión inversa (PSI, compuestos por acrilamida y acrilato de potasio entrecruzados con N, N’ metilen-bis-acrilamida y que presentan diferentes comportamientos desde el punto de vista de capacidad y velocidad de hinchamiento, módulo elástico y propie-dades de liberación, se estudia la modificación de las propiedades hidráulicas de un suelo tipo franco arcilloso realizando curvas de retención de humedad, empleando ollas de presión de plato cerámico, y se desarrollan montajes para evaluar la modificación en la retención de los mismos, ante condiciones de dosificación prolongada e instantánea de agua de irrigación. Adicionalmente, se realizan cultivos de acacia y rábano en fase vivero en suelos acondicionados con diferentes hidrogeles, en el primer cultivo se evalúa el retraso en la marchitez de la especie y en el segundo la diferencia en crecimiento; simultáneamente para los cultivos, se hace el seguimiento del contenido de humedad in situ del suelo con respecto al tiempo. Se logra un método para la medición del módulo elástico y las propiedades de liberación y se establece un modelo para predecir el comportamiento de los hidrogeles en el suelo con el conocimiento de sus propiedades básicas en el estado libre. Finalmente, los resultados muestran la bondad del uso de hidrogeles en estas aplicaciones: hay mayor facilidad de liberación y retención de agua aprovechable por el suelo, retraso notable del marchitamiento en condiciones hostiles, y es mayor el crecimiento de las especies, entre otros beneficios, además se establecen pautas para definir las características del hidrogel más adecuado dependiendo de la aplicación deseada y se realiza una proyección hacia la disminución del consumo de agua para el mantenimiento de un cultivo.

DETAILED ANALYSIS OF NEAR-IR WATER (H2O) EMISSION IN COMET C/2014 Q2 (LOVEJOY) WITH THE GIANO/TNG SPECTROGRAPH

International Nuclear Information System (INIS)

Faggi, S.; Brucato, J. R.; Tozzi, G. P.; Oliva, E.; Massi, F.; Sanna, N.; Tozzi, A.; Villanueva, G. L.; Mumma, M. J.

2016-01-01

We observed the Oort cloud comet C/2014 Q2 (Lovejoy) on 2015 January 31 and February 1 and 2 at a heliocentric distance of 1.3 au and geocentric distance of 0.8 au during its approach to the Sun. Comet Lovejoy was observed with GIANO, the near-infrared high-resolution spectrograph mounted at the Nasmyth-A focus of the TNG (Telescopio Nazionale Galileo) telescope in La Palma, Canary Islands, Spain. We detected strong emissions of radical CN and water, along with many emission features of unidentified origin, across the 1–2.5 μ m region. Spectral lines from eight ro-vibrational bands of H 2 O were detected, six of them for the first time. We quantified the water production rate [ Q (H 2 O), (3.11 ± 0.14) × 10 29 s −1 ] by comparing the calibrated line fluxes with the Goddard full non-resonance cascade fluorescence model for H 2 O. The production rates of ortho-water [ Q (H 2 O) ORTHO , (2.33 ± 0.11) × 10 29 s −1 ] and para-water [ Q (H 2 O) PARA , (0.87 ± 0.21) × 1029 s −1 ] provide a measure of the ortho-to-para ratio (2.70 ± 0.76)). The confidence limits are not small enough to provide a critical test of the nuclear spin temperature.

Detailed Analysis of Near-IR Water (H2O) Emission in Comet C/2014 Q2 (LOVEJOY) with the GIANO/TNG Spectrograph

Science.gov (United States)

Faggi, S.; Villanueva, G. L.; Mumma, M. J.; Brucato, J.R.; Tozzi, G. P.; Oliva, E.; Massi, F.; Sanna, N.; Tozzi, A.

2016-01-01

We observed the Oort cloud comet C/2014 Q2 (Lovejoy) on 2015 January 31 and February 1 and 2 at a heliocentric distance of 1.3 au and geocentric distance of 0.8 au during its approach to the Sun. Comet Lovejoy was observed with GIANO, the near-infrared high-resolution spectrograph mounted at the Nasmyth-A focus of the TNG (Telescopio Nazionale Galileo) telescope in La Palma, Canary Islands, Spain. We detected strong emissions of radical CN and water, along with many emission features of unidentified origin, across the 1-2.5 micron region. Spectral lines from eight ro-vibrational bands of H2O were detected, six of them for the first time. We quantified the water production rate [Q(H2O), (3.11+/- 0.14) x 10(exp 29)/s] by comparing the calibrated line fluxes with the Goddard full non-resonance cascade fluorescence model for H2O. The production rates of ortho-water [Q(H2O)ORTHO, (2.33+/- 0.11) x 10(exp 29)/s] and para-water [Q(H2O)PARA, (0.87+/-0.21) x 10(exp 29)/s] provide a measure of the ortho-to-para ratio (2.70+/- 0.76)). The confidence limits are not small enough to provide a critical test of the nuclear spin temperature.

Update on the Status of the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope

Science.gov (United States)

Hernandez, Svea; Aloisi, A.; Bostroem, K. A.; Cox, C.; Debes, J. H.; DiFelice, A.; Roman-Duval, J.; Hodge, P.; Holland, S.; Lindsay, K.; Lockwood, S. A.; Mason, E.; Oliveira, C. M.; Penton, S. V.; Proffitt, C. R.; Sonnentrucker, P.; Taylor, J. M.; Wheeler, T.

2013-06-01

The Space Telescope Imaging Spectrograph (STIS) has been on orbit for approximately 16 years as one of the 2nd generation instruments on the Hubble Space Telescope (HST). Its operations were interrupted by an electronics failure in 2004, but STIS was successfully repaired in May 2009 during Service Mission 4 (SM4) allowing it to resume science observations. The Instrument team continues to monitor its performance and work towards improving the quality of its products. Here we present updated information on the status of the FUV and NUV MAMA and the CCD detectors onboard STIS and describe recent changes to the STIS calibration pipeline. We also discuss the status of efforts to apply a pixel-based correction for charge transfer inefficiency (CTI) effects to STIS CCD data. These techniques show promise for ameliorating the effects of ongoing radiation damage on the quality of STIS CCD data.

EL ENFOQUE CRÍTICO: Una revisión de su historia, naturaleza y algunas aplicaciones

Directory of Open Access Journals (Sweden)

Nora Cebotarev

2003-05-01

Full Text Available La intención de este artículo es explorar las bases filosóficas e históricas de los múltiples y complejos significados y usos del Pensamiento Crítico (PC. El PC es definido como un método, analítico y autoreflexivo, teóricamente sustentado, de crítica de ideologías y prácticas convencionales, incluyendo la vida cotidiana, los sistemas políticos, el método científico de crear conocimientos y los del mismo PC. Su propósito es reunir valores morales y científicos. El artículo contiene cuatro partes. La primera discute las diversas acepciones de PC. La segunda traza el origen histórico del PC, su articulación teórica por la Escuela de Frankfurt y las múltiples contribuciones filosóficas que enriquecieron y ampliaron su significado. La tercera parte discute sus requisitos epistemológicos, morales y metodológicos y la última parte presenta algunos ejemplos de las múltiples aplicaciones del PC en varios campos.

Revisión Sistemática de Literatura: Inyección SQL en Aplicaciones web

Directory of Open Access Journals (Sweden)

Jesennia Iñiguez Banegas

2016-11-01

Full Text Available La inyección SQL es una vulnerabilidad de seguridad que afecta a las aplicaciones web. Esto ocurre cuando se inserta una consulta SQL (código malicioso, por medio de las entradas de una interfaz de cliente permitiendo leer y modificar la información. El presente artículo detalla el proceso de la revisión sistemática de literatura sobre estudios primarios que plantean propuestas y solución acerca de inyección SQL. Se siguió el protocolo propuesto por Bárbara Kitchenham y se revisó un total de 9 estudios de varias revistas y conferencias. Las investigaciones sobre inyecciones SQL es todavía un tema abierto, se ha obtenido propuestas para la prevención y detección de la misma. Una de ellas es Hibrid Modeling Framework que hace frente a las vulnerabilidades de inyección SQL en la fase de diseño. Las soluciones expuestas son muchas y diversas, enfocadas en la prevención y detección de vulnerabilidades de inyección SQL.

VULNERABILIDAD DE REDES COMPLEJAS Y APLICACIONES AL TRANSPORTE URBANO: UNA REVISIÓN DE LA LITERATURA

Directory of Open Access Journals (Sweden)

Laura Lotero Vélez

Full Text Available El interés de investigadores y profesionales de diversas disciplinas en el análisis de sistemas sociales, biológicos y artificiales desde la perspectiva de las redes complejas ha crecido notablemente en los últimos años. Algunas de estas redes son la base de muchas de las actividades del ser humano, como es el caso de las redes de transporte urbano que hacen parte de la infraestructura crítica. Una de las propiedades de mayor relevancia práctica de las redes complejas es su capacidad para mantener algunas funciones cuando ocurren fallas, errores o ataques a sus nodos o vínculos, la cual ha sido denominada robustez, resiliencia o vulnerabilidad por distintos autores. En este artículo se presenta una revisión de la literatura sobre el concepto de vulnerabilidad en el formalismo de las redes complejas y algunas aplicaciones al transporte urbano. El propósito de este artículo de revisión es el de dar a conocer a académicos y tomadores de decisión nuevos enfoques para el análisis del sistema de movilidad.

Temporal Variations of Water Vapor in the Coma of 67P/Churyumov-Gerasimenko as Observed by Rosetta’s Alice FUV Spectrograph

Science.gov (United States)

Steffl, Andrew J.; Feaga, Lori M.; A'Hearn, Michael; Bertaux, Jean-Loup; Feldman, Paul D.; Keeney, Brian A.; Knight, Matthew M.; Medina, Richard; Noonan, John; Parker, Joel Wm.; Pineau, Jon; Schindhelm, Eric; Stern, S. Alan; Versteeg, Maarten H.; Vervack, Ronald J.; Weaver, Harold A.

2017-10-01

During the Rosetta mission, the Alice far-ultraviolet (FUV) imaging spectrograph obtained spatially-resolved spectra of the coma and nucleus of comet 67P/Churyumov-Gerasimenko over the wavelength range of 700-2050Å. Typically, Alice detected emissions from the neutral atomic daughter and granddaughter products (H, O, C, and S) of the primary molecular species in the coma: H2O, CO2, CO, and O2. However, during a six-month period centered near perihelion, Alice directly detected water vapor in absorption of sunlight reflected from the nucleus. We present here analyses of the water vapor column density as measured by the Alice FUV spectrograph. Alice is sensitive to water vapor at column densities greater than ~1016 cm-2 along the sum of the Sun-nucleus and nucleus-spacecraft lines of sight. Due to the excellent temporal coverage provided by the Alice instrument (exposures were typically obtained every 5-10 minutes), we are able to show variations of water vapor in the coma caused by the changing heliocentric distance of the comet, the comet’s ~12-hour rotation period, and short-term outbursts. We compare our water vapor column densities to those derived from other instruments aboard the Rosetta spacecraft and use models to estimate the water production rate.Rosetta is an ESA mission with contributions from its member states and NASA. The Alice team acknowledges continuing support from NASA’s Jet Propulsion Laboratory through contract 1336850 to the Southwest Research Institute.

Applications of portals in the energetic sector; Aplicaciones de portales en el sector energetico

Energy Technology Data Exchange (ETDEWEB)

Santos Dominguez, Martin; Arroyo Figueroa, Gustavo [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

2000-07-01

An operative portal joins the applications, contents and services of the company in a single page of Intranet such way that promises to change deeply the information technology in the next years. The corporative portals will change what people visualize in the screen of their computer at the beginning of every working day. Unlike seeing the network (Web) only with pages of language of hypertext bearing (HTML), the corporative portal acts as a gate between Internet and the private networks. This article presents a general vision of the benefits of the corporative portals, the existing technologies and the potential markets. [Spanish] Un portal operativo une las aplicaciones, contenidos y servicios de la empresa en una sola pagina de Intranet, de tal forma que promete cambiar, profundamente la tecnologia de la informacion en los proximos anos. Los portales corporativos cambiaran lo que la gente visualiza en la pantalla de su computadora al comienzo de cada dia de trabajo. A diferencia de ver la red (Web) solo con paginas de lenguaje de marcacion de hipertexto (HTML), el portal corporativo actua como compuerta entre Internet y las redes privadas. Este articulo presenta una vision general de los beneficios de los portales corporativos, las tecnologias y los mercados potenciales existentes.

The results of spectrographic analysis of pigments from known aboriginal quarries and other outcrops in South Australia, and from painting sites in the Olary district of South Australia

International Nuclear Information System (INIS)

Nobbs, J.M.; Nobbs, M.F.; Moyle, D.W.

1997-01-01

Full text: Pigments are minerals that provide the colour to paints and the pigments most commonly used by Aboriginal people are derived from red and yellow ochre and white minerals for example, gypsum and kaolin. During the early 1980s, the opportunity arose to collect pigments from many sources in South Australia. The sources included samples from known Aboriginal quarries and other outcrops. Pinhead-size samples of paint were collected from figures in some of the rock painting sites in the Olary District. These samples were analysed using Emission Spectrography with the aim of determining the nature of the pigments that is their constituent elements, and to investigate the possibility of finger-printing the sources of the pigments used by Aboriginal people. The ability of being able to source pigments found on the decorated surface of artefacts; pieces of ochre found in archaeological deposits or painted figures in a rock painting is important for understanding the trading and exchange network known to criss-cross Australia in the past. Facilities for Emission Spectrographic analyses were readily available and the capability to analyse (for twenty six elements) samples in milligram proportions suggested its use for the determination of the composition of material from unlimited sources and the compilation of a data-base detailing the results of the analyses in a form suitable for comparison. Examination of this database could then lead to further investigations with narrower and more specific aims. The results of the spectrographic analyses for red ochre from eighteen sources and yellow ochres from eight sources were tabulated as: strongly present >10%; present 1-10%; strong trace 0.1-1% ; trace 0.01-0.1%; faint trace <0.01%. Major elements, for example iron, aluminium, and silica showed in the Strongly Present and Present categories, while Trace and Faint Trace elements were variable. The results of the analyses of seventeen samples of red pigment and five

AN INTERFACE REGION IMAGING SPECTROGRAPH FIRST VIEW ON SOLAR SPICULES

Energy Technology Data Exchange (ETDEWEB)

Pereira, T. M. D.; De Pontieu, B.; Carlsson, M.; Hansteen, V. [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, NO-0315 Oslo (Norway); Tarbell, T. D.; Lemen, J.; Title, A.; Boerner, P.; Hurlburt, N.; Wülser, J. P.; Martínez-Sykora, J.; Kleint, L. [Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Org. A021S, Bldg. 252, Palo Alto, CA 94304 (United States); Golub, L.; McKillop, S.; Reeves, K. K.; Saar, S.; Testa, P.; Tian, H. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Jaeggli, S.; Kankelborg, C., E-mail: tiago.pereira@astro.uio.no [Department of Physics, Montana State University, P.O. Box 173840, Bozeman, MT 59717 (United States)

2014-09-01

Solar spicules have eluded modelers and observers for decades. Since the discovery of the more energetic type II, spicules have become a heated topic but their contribution to the energy balance of the low solar atmosphere remains unknown. Here we give a first glimpse of what quiet-Sun spicules look like when observed with NASA's recently launched Interface Region Imaging Spectrograph (IRIS). Using IRIS spectra and filtergrams that sample the chromosphere and transition region, we compare the properties and evolution of spicules as observed in a coordinated campaign with Hinode and the Atmospheric Imaging Assembly. Our IRIS observations allow us to follow the thermal evolution of type II spicules and finally confirm that the fading of Ca II H spicules appears to be caused by rapid heating to higher temperatures. The IRIS spicules do not fade but continue evolving, reaching higher and falling back down after 500-800 s. Ca II H type II spicules are thus the initial stages of violent and hotter events that mostly remain invisible in Ca II H filtergrams. These events have very different properties from type I spicules, which show lower velocities and no fading from chromospheric passbands. The IRIS spectra of spicules show the same signature as their proposed disk counterparts, reinforcing earlier work. Spectroheliograms from spectral rasters also confirm that quiet-Sun spicules originate in bushes from the magnetic network. Our results suggest that type II spicules are indeed the site of vigorous heating (to at least transition region temperatures) along extensive parts of the upward moving spicular plasma.

ULTRAVIOLET DISCOVERIES AT ASTEROID (21) LUTETIA BY THE ROSETTA ALICE ULTRAVIOLET SPECTROGRAPH

International Nuclear Information System (INIS)

Stern, S. A.; Parker, J. Wm.; Steffl, A.; Birath, E.; Graps, A.; Feldman, P. D.; Weaver, H. A.; A'Hearn, M. F.; Feaga, L.; Bertaux, J.-L.; Slater, D. C.; Versteeg, M.; Scherrer, J. R.; Cunningham, N.

2011-01-01

The NASA Alice ultraviolet (UV) imaging spectrograph on board the ESA Rosetta comet orbiter successfully conducted a series of flyby observations of the large asteroid (21) Lutetia in the days surrounding Rosetta's closest approach on 2010 July 10. Observations included a search for emission lines from gas, and spectral observations of the Lutetia's surface reflectance. No emissions from gas around Lutetia were observed. Regarding the surface reflectance, we found that Lutetia has a distinctly different albedo and slope than both the asteroid (2867) Steins and Earth's moon, the two most analogous objects studied in the far ultraviolet (FUV). Further, Lutetia's ∼10% geometric albedo near 1800 A is significantly lower than its 16%-19% albedo near 5500 A. Moreover, the FUV albedo shows a precipitous drop (to ∼4%) between 1800 A and 1600 A, representing the strongest spectral absorption feature observed in Lutetia's spectrum at any observed wavelength. Our surface reflectance fits are not unique but are consistent with a surface dominated by an EH5 chondrite, combined with multiple other possible surface constituents, including anorthite, water frost, and SO 2 frost or a similar mid-UV absorber. The water frost identification is consistent with some data sets but inconsistent with others. The anorthite (feldspar) identification suggests that Lutetia is a differentiated body.

Analysis and application of equivalents in power systems; Analisis y aplicacion de equivalentes en sistemas de potencia

Energy Technology Data Exchange (ETDEWEB)

Salinas Barrera, Humberto

1987-09-01

The main objective of this thesis is to present a network reduction model that can be used in the simulation of diverse phenomena that occur in the operation of the electric power systems (EPS). The work shows the development and the application of the equivalent in studies of: power flows in steady state, transient stability, generalized dynamic behavior and simplified frequency behavior. This model arises as a result of the EPS behavior observation and analysis, separating loads, generations, electric networks and its elements in derivation, effects. The algorithm uses an alternative approach to the equivalent's traditional presentation, where the loads are weighed in the process of elimination of their neighboring nodes, based on a vectorial reduction of the lines or transformers that become involved in the eliminated node. Similarly the effects of the elements are transferred to the derived elements. The results thus obtained have a small maladjustment in reactive power, becoming then necessary to compensate the reduced base case. The compensation is only necessary in the nodes that were neighbors to one that was eliminated during the process, and this compensation is made considering the branches that finally resulted connected to such node. The algorithm utilizes the obtained voltages in the original base case to calculate the output complex potencies of each one of the branches connected to the compensated node. The summation of the resulting potencies are the adjustments to the reduced base case. The proposed model of equivalents allows the analysis of contingencies in points where the traditional equivalents do not allow it, because of losing the sensibility in bringing close together the contingencies to the equivalent, the method allows analyzing any contingency in the center of the equivalent without concerning their proximity to the external area, inclusively contingencies in the center of the equivalent can be studied. The equivalent proposed was

Influencia del rayado sobre la resistencia electroquímica de les aleaciones de NiTi tratadas por un nuevo tratamiento térmico para aplicaciones biomédicas

OpenAIRE

Soualah, Lakhdar

2005-01-01

Las aleaciones de níquel-titanio son aleaciones que se utilizan cada vez más en aplicaciones biomédicas, por sus propiedades interesantes de superelasticidad, de memoria de forma, de resistencia a la corrosión y de biocompatibilidad. Sin embargo, los resultados obtenidos de su resistencia a la corrosión son muy variables, dependiendo del estado de superficie. Así, para mejorar, la resistencia a la corrosión de este material, se diseñó en un trabajo anterior un nuevo tratamie...

Protection of structures and buildings against the effect of electrical storms: basic concepts, evolution and application in Mexico; Proteccion contra el efecto de las tormentas electricas de estructuras y edificios: conceptos basicos, evolucion y aplicacion en Mexico

Energy Technology Data Exchange (ETDEWEB)

Galvan Diego, Arturo; Velazquez Sanchez, Raul [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

2001-07-01

The applied technology, supported by the analysis, the experimentation and the scientific observation, has demonstrated its effectiveness in the modernization of hundreds of industrial and commercial processes, of communication and services, as well as of the materials and methodologies used for the protection of diverse equipment and processes; from the protection in systems and equipment in high tension to systems that handle very low energy, among them are included electronic and digital devices. Nevertheless, fundamental laws like the Ohm's Law, the gravity law or the universal gas law exist that, although they were discovered many years ago, still are effective and their validity provides invaluable elements for the development of new methods, technological processes and developments. One of the most relevant cases than amalgamates the application of fundamental criteria and the development of new technologies and its application in the so-called no conventional protective devices, constitute the protection against the effect of electrical storms in buildings and structures. The worldwide application of these devices has generated skepticism of a great part of the scientific community, diverse reactions among the users and a firm position on the part of the manufacturers so that these technologies are included in international standards. The objective of this article is to offer the reader the basic information on the beginnings of the protection, the evolution that the protection methods against electrical storms have had since the XVIII century, the application of the fundamental criteria of protection in structures or modern buildings and their content, as well as the situation that prevails at the moment in the committees of the diverse national and international normative organizations with respect to the inclusion of the new technologies in the design guides. [Spanish] La tecnologia aplicada, apoyada en el analisis, la experimentacion y la

Planteamiento y evaluación de las aplicaciones de los productos obtenidos en la hidrólisis alcalina de las virutas de cromo generadas durante el procesamiento del cuero

OpenAIRE

Díaz, Andrea; Jiménez, Juliana; Pérez, Monica; Narváez Rincón, Paulo César

2010-01-01

Considerando el concepto de maximizar la reutilización de residuos sólidos de curtiembres en diversos usos industriales y la minimización del impacto ambiental que estos generan, se evalúan algunas aplicaciones de los subproductos obtenidos por la hidrólisis alcalina de las “virutas de cromo”5 generadas durante la etapa de rebalado en el procesamiento del cuero. El hidróxido de cromo obtenido transformado en sulfato de cromo mo- nobasico puede reutilizarse en el procesamiento del cuero co...

Binned level-3 Sea Surface Salinity from Aquarius/Satélite de Aplicaciones Científicas (SAC)-D mission in support of the National Centers for Environmental Information (NCEI) data quality monitoring system (DQMS) from 2011-08-28 to 2015-06-10 (NCEI Accession 0151631)

Data.gov (United States)

National Oceanic and Atmospheric Administration, Department of Commerce — The data quality monitoring system (DQMS) for the Aquarius/Satélite de Aplicaciones Científicas (SAC)-D satellites level-2 sea-surface salinity (SSS) swath data...

Aplicaciones de aluminio mantienen el crecimiento de fresa (Fragaria × ananassa Duch. suplementada con roca fosfórica en condiciones de cultivo sin suelo

Directory of Open Access Journals (Sweden)

Martín Alejandro Tucuch Pérez

2017-07-01

Full Text Available Se estima que en los próximos años a nivel mundial habrá carencia de las fuentes de fósforo (P utilizadas para fabricar los fertilizantes fosforados. Aunque el P puede encontrarse en el suelo, la mayor parte se encuentra en forma no asimilable por las plantas, por lo que para absorberlo éstas exudan ácidos orgánicos (AO para facilitar su solubilización. Por otro lado, se ha reportado que la presencia de aluminio (Al se relaciona con un aumento en la exudación de AO por la raíz. Dado la capacidad solubilizadora de los AO, en el presente estudio se planteó evaluar el efecto de la aplicación de Al sobre la exudación de AO y el uso de P en forma no soluble (roca fosfórica, RF en el crecimiento y rendimiento de plantas de fresa. El experimento constó de ocho tratamientos que resultaron de combinar dos cantidades de RF, mezcladas en el sustrato, con aplicaciones de Al. Los tratamientos con RF se irrigaron con una solución que contenía 0.25 meq L‑1 H2PO4‑. Los resultados mostraron que con aplicaciones de Al vía riego se obtienen mayores rendimientos, hasta 380 g planta-1, lo cual estuvo correlacionado positivamente con la concentración de ácido cítrico y negativamente con la concentración de ácido málico en el sustrato. Se concluye que el citrato exudado por la raíz debido a la aplicación de Al, favorece el rendimiento de plantas de fresa cuando el P se encuentra en forma de RF.

Spitzer Infrared Spectrograph Observations of the Galactic Center: Quantifying the Extreme Ultraviolet/Soft X-ray Fluxes

Science.gov (United States)

Simpson, Janet P.

2018-04-01

It has long been shown that the extreme ultraviolet spectrum of the ionizing stars of H II regions can be estimated by comparing the observed line emission to detailed models. In the Galactic Center (GC), however, previous observations have shown that the ionizing spectral energy distribution (SED) of the local photon field is strange, producing both very low excitation ionized gas (indicative of ionization by late O stars) and also widespread diffuse emission from atoms too highly ionized to be found in normal H II regions. This paper describes the analysis of all GC spectra taken by Spitzer's Infrared Spectrograph and downloaded from the Spitzer Heritage Archive. In it, H II region densities and abundances are described, and serendipitously discovered candidate planetary nebulae, compact shocks, and candidate young stellar objects are tabulated. Models were computed with Cloudy, using SEDs from Starburst99 plus additional X-rays, and compared to the observed mid-infrared forbidden and recombination lines. The ages inferred from the model fits do not agree with recent proposed star formation sequences (star formation in the GC occurring along streams of gas with density enhancements caused by close encounters with the black hole, Sgr A*), with Sgr B1, Sgr C, and the Arches Cluster being all about the same age, around 4.5 Myr old, with similar X-ray requirements. The fits for the Quintuplet Cluster appear to give a younger age, but that could be caused by higher-energy photons from shocks from stellar winds or from a supernova.

Testing como Práctica para Evaluar la Eficiencia en Aplicaciones Web

Directory of Open Access Journals (Sweden)

Delvis Echeverría Perez

2014-10-01

Full Text Available La investigación está asociada al Testing como práctica para evaluar uno de los atributos de calidad que describe la Norma ISO/IEC 9126 como característica la “Eficiencia”, que es según esta norma: La capacidad del producto de software para proporcionar una ejecución o desempeño apropiado, en relación con la cantidad de recursos utilizados usados, bajo condiciones establecidas. Para evaluar esta característica se han identificado un conjunto de tipos de Test, teniendo en cuenta las sub-características de la misma ellas son: Rendimiento, Carga y Estrés, además se propone un procedimiento que guía la gestión y ejecución de los diferentes test. Para las No Conformidades (errores generados se ha elaborado una clasificación dependiendo de su tipo. Se propone el uso de herramientas automatizadas para la ejecución de los diferentes test, específicamente la herramienta JMETER, usada para analizar y medir el desempeño de una variedad de servicios, con énfasis en aplicaciones web. Se creó una Base de Casos de posibles soluciones que dan respuesta a errores HTTP. Todos estos elementos descritos anteriormente proveen de un marco para la evaluación final de la característica en cuestión en productos de software, proponiéndose un conjunto de métricas que arrojan resultados cuantitativos por cada sub-característica de la Norma o por tipos de test propuestos.

K-KIDS: K Dwarfs and Their Companions. First Results from Radial Velocity Survey with CHIRON Spectrograph

Science.gov (United States)

Paredes, Leonardo; Henry, Todd; Nusdeo, Daniel; Winters, J.; Dincer, Tolga

2018-01-01

We present the K-KIDS project, an effort to survey a large sample of K dwarfs and their companions, the KIDS. We are observing a carefully vetted equatorial sample (DEC = -30 to +30) of more than 1000 K dwarfs within 50 pc to make a comprehensive assessment of stellar, substellar and planetary companions with separations of 0.1 to 10,000 AU.The initial sample of 1048 stars has been compiled using astrometric data from Hipparcos and photometric data from Tycho-2 and 2MASS. Four different imaging and spectroscopic surveys are underway. Here we present the strategy and initial results for our high-precision radial velocity survey for the closest companions using the CHIRON spectrograph on the CTIO/SMARTS 1.5m telescope. Individual measurements with CHIRON at R = 80,000 using ThAr wavelength calibration, indicate that for K dwarf radial velocity standards with V = 5.8, 7.0 and 8.0 yield precisions over 6 weeks of observing of 7.4 m/s, 9.8 m/s and 5.7 m/s. In the first two months, a core sample of 42 K dwarfs, including carefully selected calibration systems as well as previously unobserved stars, was observed every few nights to detect the radial velocity signals of close companions. In our calibration stellar systems, we have confirmed the suitability of CHIRON for our studies, by having found periodic radial velocity perturbations consistent with hot Jupiter and stellar companions previously detected. This set forms the foundation of our one-year survey of 100 K dwarfs with magnitudes as faint as V = 11.5, for which we should detect companions with masses as low as Jupiter.In light of the promising performance and efficiency of the CHIRON spectrograph for a long-term radial velocity survey, we have expanded our initial sample using Gaia Data Release 1 to 1824 K dwarfs within 50 pc. Ultimately, the combination of all four surveys will provide an unprecedented portrait of K dwarfs and their kids.This effort has been supported by the NSF through grant AST-1517413, and

The ICE spectrograph for PEPSI at the LBT: preliminary optical design

Science.gov (United States)

Pallavicini, Roberto; Zerbi, Filippo M.; Spano, Paolo; Conconi, Paolo; Mazzoleni, Ruben; Molinari, Emilio; Strassmeier, Klaus G.

2003-03-01

We present a preliminary design study for a high-resolution echelle spectrograph (ICE) to be used with the spectropolarimeter PEPSI under development at the LBT. In order to meet the scientific requirements and take full advantage of the peculiarities of the LBT (i.e. the binocular nature and the adaptive optics capabilities), we have designed a fiber-fed bench mounted instrument for both high resolution (R ≍ 100,000; non-AO polarimetric and integral light modes) and ultra-high resolution (R ≍ 300,000; AO integral light mode). In both cases, 4 spectra per order (two for each primary mirror) shall be accomodated in a 2-dimensional cross dispersed echelle format. In order to obtain a resolution-slit product of ≍ 100,000 as required by the science case, we have considered two alternative designs, one with two R4 echelles in series and the other with a sigle R4 echelle and fiber slicing. A white-pupil design, VPH cross-dispersers and two cameras of different focal length for the AO and non-AO modes are adopted in both cases. It is concluded that the single-echelle fiber-slicer solution has to be preferred in terms of performances, complexity and cost. It can be implemented at the LBT in two phases, with the long-camera AO mode added in a second phase depending on the availability of funds and the time-scale for implementation of the AO system.

Framework para desarrollo de aplicaciones educativas móviles, basado en modelos de enseñanza

Directory of Open Access Journals (Sweden)

William Oswaldo Cuervo Gómez

2017-05-01

Full Text Available Los adelantos tecnológicos registrados en los últimos años en el sector de los dispositivos móviles han permitido contar con mejores especificaciones de hardware y software. Iniciativas como la del gobierno de Colombia, que tiene el propósito de dotar con tabletas a las instituciones educativas oficiales del país, motivaron el interés de docentes y demás actores del proceso educativo por proponer estrategias para la incorporación de dispositivos móviles en contextos educativos. En esta perspectiva, la presente investigación tiene como propósito proponer un framework, que permite combinar aspectos pedagógicos y tecnológicos en el proceso de desarrollo de aplicaciones educativas móviles, que respondan a las necesidades del entorno educativo al cual serán incorporadas. Este documento muestra los resultados obtenidos en la investigación desarrollada en cuatro etapas metodológicas: diagnóstico, conceptualización y caracterización, propuesta e implementación del framework, y análisis de resultados.

El enfoque crítico: una revisión de su historia, naturaleza y algunas aplicaciones

Directory of Open Access Journals (Sweden)

Eleanora A. Cebotarev

2003-01-01

Full Text Available La intención de este artículo es explorar las bases filosóficas e históricas de los múltiples y complejos significados y usos del Pensamiento Critico (PC. El PC es definido como un método, analítico y autoreflexivo, teóricamente sustentado, de crítica de ideologías y prácticas convencionales, incluyendo la vida cotidiana, los sistemas políticos, el método científico de crear conocimientos y los del mismo PC. Su propósito es reunir valores morales y científicos. El artículo contiene cuatro partes. La primera discute las diversas acepciones de PC. La segunda traza el origen histórico del PC, su articulación teórica por la Escuela de Frankfurt y las múltiples contribuciones filosóficas que enriquecieron y ampliaron su significado. La tercera parte discute sus requisitos epistemológicos, morales y metodológicos y la última parte presenta algunos ejemplos de las múltiples aplicaciones del PC en varios campos

Advances and applications of rock physics for hydrocarbon exploration; Avances y aplicaciones en fisica de rocas para exploracion de hidrocarburos

Energy Technology Data Exchange (ETDEWEB)

Vargas-Meleza, L.; Valle-Molina, C. [Instituto Mexicano del Petroleo (Mexico)]. E-mails: lvargasm@imp.mx; cvallem@imp.mx

2012-10-15

Integration of the geological and geophysical information with different scale and features is the key point to establish relationships between petrophysical and elastic characteristics of the rocks in the reservoir. It is very important to present the fundamentals and current methodologies of the rock physics analyses applied to hydrocarbons exploration among engineers and Mexican students. This work represents an effort to capacitate personnel of oil exploration through the revision of the subjects of rock physics. The main aim is to show updated improvements and applications of rock physics into seismology for exploration. Most of the methodologies presented in this document are related to the study the physical and geological mechanisms that impact on the elastic properties of the rock reservoirs based on rock specimens characterization and geophysical borehole information. Predictions of the rock properties (lithology, porosity, fluid in the voids) can be performed using 3D seismic data that shall be properly calibrated with experimental measurements in rock cores and seismic well log data. [Spanish] Se discuten los fundamentos de fisica de rocas y las implicaciones analiticas para interpretacion sismica de yacimientos. Se considera conveniente difundir, entre los ingenieros y estudiantes mexicanos, los fundamentos y metodologias actuales sobre el analisis de la fisica de rocas en exploracion de hidrocarburos. Este trabajo representa un esfuerzo de capacitacion profesional en exploracion petrolera en el que se difunde la relevancia de la fisica de rocas. El interes principal es exponer los avances tecnologicos y aplicaciones actuales sobre fisica de rocas en el campo de sismologia de exploracion. La mayoria de las metodologias estudia los mecanismos fisicos y geologicos que controlan las propiedades elasticas de los yacimientos de hidrocarburos, a partir de nucleos de roca y registros geofisicos de pozo. Este conocimiento se usa para predecir propiedades de la

Fermentation Tecniques and Applications of Bacterial Cellulose: a Review Técnicas de fermentación y aplicaciones de la celulosa bacteriana: una revisión

Directory of Open Access Journals (Sweden)

Luz Dary Carreño Pineda

2012-12-01

Full Text Available Bacterial cellulose is a polymer obtained by fermentation with microorganismsfrom Acetobacter, Rhizobium, Agrobacterium and Sarcina genera. Amongthem, Acetobacter xylinum is the most efficient specie. This polymer hasthe same chemical composition of plant cellulose, but its conformation andphysicochemical properties are different, making it attractive for several applications, especially in the areas of food, separation processes, catalysis andhealth, due to its biocompatibility. However, the main problem is the production in mass that is constrained by low yield. It is therefore necessaryto develop some alternatives. This paper presents a review about synthesis,production, properties and principal applications of bacterial cellulose, as wellas some alternatives to reduce the difficulties for process scaling.La celulosa bacteriana es un polímero obtenido por fermentación con microrganismosde los géneros Acetobacter, Rhizobium, Agrobacterium y Sarcina, delas cuales la especie más eficiente es la Acetobacter Xylinum. Este polímero presenta la misma estructura química de la celulosa de origen vegetal, pero difiereen su conformación y propiedades fisicoquímicas, lo que lo hace atractivo para diversas aplicaciones, especialmente en las áreas de alimentos, procesosde separación, catálisis y en medicina, gracias a su biocompatibilidad. Sin embargo, el principal problema es la producción a gran escala limitada por losbajos rendimientos, lo que genera la necesidad de desarrollar alternativas que permitan disminuir o eliminar las causas de esta limitación. En este artículo se hace una revisión acerca de la síntesis, producción, propiedades y principales aplicaciones de la celulosa bacteriana, así como de algunas alternativas estudiadas para disminuir los inconvenientes en el escalamiento del proceso.

Field Raman spectrograph for environmental analysis

International Nuclear Information System (INIS)

Carrabba, M.M.

1995-01-01

The use of Raman Spectroscopy in the screening of soils, ground water, and surface waters for pollutants is described. A probe accessory for conducting surface enhanced Raman Spectroscopy is undergoing testing for dilute chlorinated solvents

Graph matching using position coordinates and local features for image analysis

OpenAIRE

Sanromà Güell, Gerard

2012-01-01

Trobar les correspondències entre dues imatges és un problema crucial en el camp de la visió per ordinador i el reconeixement de patrons. És rellevant per un ampli ventall de propòsits des d’aplicacions de reconeixement d’objectes en les àrees de biometria, anàlisi de documents i anàlisi de formes fins aplicacions relacionades amb geometria des de múltiples punts de vista tals com recuperació de pose, estructura des del moviment i localització i mapeig. La majoria de les tècniques existents ...

Application of electro-technology in heating industrial processes; Aplicacion de electrotecnologia en procesos industriales de calentamiento

Energy Technology Data Exchange (ETDEWEB)

Gonzalez Milla, Guillermo [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

2001-07-01

produccion, aumentar la productividad asi como mejorar la seguridad y condiciones de trabajo. Aunado a lo anterior, las electrotecnologias ofrecen otras ventajas adicionales como facilitar la automatizacion, robotizacion y supervision computarizada de produccion industrial. La gran variedad de estas tecnologias y sus amplios campos de aplicacion hacen dificil una presentacion de ellas mostrando sus ventajas en el campo de la eficiencia energetica y con respecto al valor agregado del producto a ser terminado, asi como su impacto en el medio ambiente al disminuir los contaminantes a la atmosfera. El presente articulo menciona diversos tipos de electrotecnologias, haciendo enfasis en aquellas dedicadas a proporcionar calor debido al impacto que, por su aplicacion, pueden producir en el sistema electrico y a la deduccion de contaminantes al medio ambiente. La tabla 1 muestra el diverso rango de industrias que pueden usar electrotecnologias. Se muestra la tabla del tipo de industrias que pueden usar electrotecnologias, asi como de la evaluacion de estas.

Sistema Oscilador Mejorado para Aplicaciones de Microbalanza (QCM) en Medios Líquidos y Propuesta de un Nuevo Método de Caracterización para Biosensores Piezoeléctricos

OpenAIRE

MONTAGUT FERIZZOLA, YEISON JAVIER

2011-01-01

La microbalanza de cristal de cuarzo (QCM) se usa como técnica alternativa de análisis químico, donde las aplicaciones dependen directamente de la sensibilidad del cristal. Por tanto, es el parámetro más importante que determina el uso de los cristales de cuarzo frente a otras técnicas. La ecuación de Sauerbrey, teóricamente relaciona la variación de la densidad de masa en la superficie del cristal con el cambio de la frecuencia y al mismo tiempo predice que la sensibilidad aumenta en la mis...

Diseño e implementación de maletas didácticas con los mini PLCS logo y Zelio para aplicaciones de arranque e inversión de giro de motores.

OpenAIRE

Hermenegildo Cedeño, Byron Jose; Orellana Apolinario, Andrés Octavio

2015-01-01

La presente tesis: “Diseño e implementación de maletas didácticas con mini plc logo para aplicaciones de arranque e inversión de giro de motores” representa el desarrollo de tres módulos didácticos de pruebas para que los estudiantes fortalezcan sus conocimientos teóricos en la parte práctica implemantando y reconociendo el comportamiento de diferentes tipos de actuadores existentes en el mercado como lo son: contactares, guarda motores, temporizadores, LOGOs programables. Este trabajo b...

Production and analysis of some atomic emission spectra in the vacuum ultraviolet

International Nuclear Information System (INIS)

Meijer, F.G.

1979-01-01

The development of technical facilities for spectra analysis are described including the design, construction and adjustment of a grazing incidence spectrograph for the extreme ultraviolet and the improvements in light sources. The investigations of the fifth and fourth spectra of tantalum, the analysis of the sixth spectrum of tungsten, the extension of the analysis of the fourth spectrum of hafnium and a start of the analysis of the seventh spectrum of rhenium are presented. (C.F.)

Analytical data and sample locality map for aqua-regia leachates of stream sediments analyzed by ICP, and emission spectrographic and ICP results for many NURE stream sediments from the Killik River Quadrangle, Alaska

International Nuclear Information System (INIS)

Motooka, J.M.; Adrian, B.M.; Church, S.E.; McDougal, C.M.; Fife, J.B.

1989-01-01

A U.S. Geological Survey report is presented giving analytical data and sample locality map for aqua-regia leachates of stream sediments analyzed by ICP, and emission spectrographic and ICP results for many NURE stream sediments from the Killik River Quadrangle, Alaska

DETAILED ANALYSIS OF NEAR-IR WATER (H{sub 2}O) EMISSION IN COMET C/2014 Q2 (LOVEJOY) WITH THE GIANO/TNG SPECTROGRAPH

Energy Technology Data Exchange (ETDEWEB)

Faggi, S.; Brucato, J. R.; Tozzi, G. P.; Oliva, E.; Massi, F.; Sanna, N.; Tozzi, A. [Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Firenze (Italy); Villanueva, G. L.; Mumma, M. J., E-mail: sfaggi@arcetri.astro.it [NASA Goddard Space Flight Centre, 8800 Greenbelt Rd, Greenbelt, MD 20771 (United States)

2016-10-20

We observed the Oort cloud comet C/2014 Q2 (Lovejoy) on 2015 January 31 and February 1 and 2 at a heliocentric distance of 1.3 au and geocentric distance of 0.8 au during its approach to the Sun. Comet Lovejoy was observed with GIANO, the near-infrared high-resolution spectrograph mounted at the Nasmyth-A focus of the TNG (Telescopio Nazionale Galileo) telescope in La Palma, Canary Islands, Spain. We detected strong emissions of radical CN and water, along with many emission features of unidentified origin, across the 1–2.5 μ m region. Spectral lines from eight ro-vibrational bands of H{sub 2}O were detected, six of them for the first time. We quantified the water production rate [ Q (H{sub 2}O), (3.11 ± 0.14) × 10{sup 29} s{sup −1}] by comparing the calibrated line fluxes with the Goddard full non-resonance cascade fluorescence model for H{sub 2}O. The production rates of ortho-water [ Q (H{sub 2}O){sup ORTHO}, (2.33 ± 0.11) × 10{sup 29} s{sup −1}] and para-water [ Q (H{sub 2}O){sup PARA}, (0.87 ± 0.21) × 1029 s{sup −1}] provide a measure of the ortho-to-para ratio (2.70 ± 0.76)). The confidence limits are not small enough to provide a critical test of the nuclear spin temperature.

Spectrographic determination of beryllium in the atmosphere; Dosage spectrographique du beryllium dans l'atmosphere

Energy Technology Data Exchange (ETDEWEB)

Soudain, G; Morawek, T [Commissariat a l' Energie Atomique, Saclay (France).Centre d' Etudes Nucleaires

1959-07-01

Since the apparatus for continuous determination of beryllium is not yet perfect, a discontinuous method has been developed. The air to be analysed is filtered, and the dust laden filter is dissolved in a mixture of sulphuric and nitric acid. The pH and the conductivity of the solution obtained were adjusted to standard values, and it was then analysed spectro-graphically by the rotating sector method. Up to 0.01 x 10{sup 6} of Be per cm{sup 3} of solution can be detected. The precision is of the order of 10 per cent. (author) [French] Les appareils de dosage du beryllium en continu n'etant pas encore suffisamment au point, on a elabore une methode discontinue. L'air a analyser est filtre et le filtre charge de poussieres est mis en solution par une attaque sulfo-nitrique. La solution obtenue est normalisee par ajustage de son PH et de sa conductivite puis analysee spectrographiquement par la methode du disque tournant. On peut detecter jusqu'a 0,01.10{sup 6} de Be par cm{sup 3} de solution. La precision est de l'ordre de 10 pour cent. (auteur)

Improvement of spectrographic analyses by the use of a mechanical packer in the arc distillation technique; Amelioration de l'analyse spectrograpique par l'utilisation d'un tasseur mecanique dans la methode de distillation dans l'arc

Energy Technology Data Exchange (ETDEWEB)

Buffereau, M; Deniaud, S; Pichotin, B; Violet, R [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

1965-07-01

One studies improvement of spectrographic analysis by the 'carrier distillation' method with the help of a mechanical device. Experiments and advantages of such an apparatus are given (precision and reproducibility improvement, operator factor suppression). A routine apparatus (French patent no 976.493) is described. (authors) [French] On etudie l'amelioration des analyses spectrographiques par la methode de distillation avec entra eur dans l'arc au moyen d'un tasseur mecanique. On indique les experiences realisees et les avantages de l'emploi d'un tel appareil (amelioration de la precision et de la reproductibilite, suppression du facteur operateur). On decrit l'appareil de routine objet du brevet no 976.493 du 29 mai 1964. (auteurs)

Análisis de la detección de colisiones en un entorno virtual para aplicaciones hápticas de asistencia quirúrgica

Directory of Open Access Journals (Sweden)

María Luisa Pinto Salamanca

2011-01-01

Con base en los resultados de algunos trabajos relacionados con la obtención, procesamiento y análisis de imágenes para la construcción de modelos, se desarrollan aplicaciones hápticas de interacción con sólidos rígidos de interés médico, que incluyen herramientas para la marcación de puntos y trayectorias sobre una superficie, y un algoritmo de reflexión de fuerzas para la simulación de interacción con órganos modelados por medio de técnicas hibridas (renderizado superficial y volumétrico. Se hace especial énfasis en la representación de los instrumentos virtuales quirúrgicos, integrando herramientas con geometría 3D.

Spectroscopic Characterization of GEO Satellites with Gunma LOW Resolution Spectrograph

Science.gov (United States)

Endo, T.; Ono, H.; Hosokawa, M.; Ando, T.; Takanezawa, T.; Hashimoto, O.

The spectroscopic observation is potentially a powerful tool for understanding the Geostationary Earth Orbit (GEO) objects. We present here the results of an investigation of energy spectra of GEO satellites obtained from a groundbased optical telescope. The spectroscopic observations were made from April to June 2016 with the Gunma LOW resolution Spectrograph and imager (GLOWS) at the Gunma Astronomical Observatory (GAO) in JAPAN. The observation targets consist of eleven different satellites: two weather satellites, four communications satellites, and five broadcasting satellites. All the spectra of those GEO satellites are inferred to be solar-like. A number of well-known absorption features such as H-alpha, H-beta, Na-D,water vapor and oxygen molecules are clearly seen in thewavelength range of 4,000 - 8,000 Å. For comparison, we calculated the intensity ratio of the spectra of GEO satellites to that of the Moon which is the natural satellite of the earth. As a result, the following characteristics were obtained. 1) Some variations are seen in the strength of absorption features of water vapor and oxygen originated by the telluric atmosphere, but any other characteristic absorption features were not found. 2) For all observed satellites, the intensity ratio of the spectrum of GEO satellites decrease as a function of wavelength or to be flat. It means that the spectral reflectance of satellite materials is bluer than that of the Moon. 3) A characteristic dip at around 4,800 Å is found in all observed spectra of a weather satellite. Based on these observations, it is indicated that the characteristics of the spectrum are mainly derived from the solar panels because the apparent area of the solar cell is probably larger than that of the satellite body.

Rotational temperature of N2+ (0,2 ions from spectrographic measurements used to infer the energy of precipitation in different auroral forms and compared with radar measurements

Directory of Open Access Journals (Sweden)

D. Lummerzheim

2008-05-01

Full Text Available High resolution spectral data are used to estimate neutral temperatures at auroral heights. The data are from the High Throughput Imaging Echelle Spectrograph (HiTIES which forms part of the Spectrographic Imaging Facility (SIF, located at Longyearbyen, Svalbard in Norway. The platform also contains photometers and a narrow angle auroral imager. Quantum molecular spectroscopy is used for modelling N2+ 1NG (0,2, which serves as a diagnostic tool for neutral temperature and emission height variations. The theoretical spectra are convolved with the instrument function and fitted to measured rotational transition lines as a function of temperature. Measurements were made in the magnetic zenith, and along a meridian slit centred on the magnetic zenith. In the results described, the high spectral resolution of the data (0.08 nm allows an error analysis to be performed more thoroughly than previous findings, with particular attention paid to the correct subtraction of background, and to precise wavelength calibration. Supporting measurements were made with the Svalbard Eiscat Radar (ESR. Estimates were made from both optical and radar observations of the average energy of precipitating electrons in different types of aurora. These provide confirmation that the spectral results are in agreement with the variations observed in radar profiles. In rayed aurora the neutral temperature was highest (800 K and the energy lowest (1 keV. In a bright curling arc, the temperature at the lower border was about 550 K, corresponding to energies of 2 keV. The radar and modelling results confirm that these average values are a lower limit for an estimation of the characteristic energy. In each event the energy distribution is clearly made up of more than one spectral shape. This work emphasises the need for high time resolution as well as high spectral resolution. The present work is the first to provide rotational temperatures using a method which pays particular

First Direct Mass Measurements of Nuclides around Z =100 with a Multireflection Time-of-Flight Mass Spectrograph

Science.gov (United States)

Ito, Y.; Schury, P.; Wada, M.; Arai, F.; Haba, H.; Hirayama, Y.; Ishizawa, S.; Kaji, D.; Kimura, S.; Koura, H.; MacCormick, M.; Miyatake, H.; Moon, J. Y.; Morimoto, K.; Morita, K.; Mukai, M.; Murray, I.; Niwase, T.; Okada, K.; Ozawa, A.; Rosenbusch, M.; Takamine, A.; Tanaka, T.; Watanabe, Y. X.; Wollnik, H.; Yamaki, S.

2018-04-01

The masses of 246Es, 251Fm, and the transfermium nuclei Md-252249 and 254No, produced by hot- and cold-fusion reactions, in the vicinity of the deformed N =152 neutron shell closure, have been directly measured using a multireflection time-of-flight mass spectrograph. The masses of 246Es and 249,250,252Md were measured for the first time. Using the masses of Md,250249 as anchor points for α decay chains, the masses of heavier nuclei, up to 261Bh and 266Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter δ2 n derived from three isotopic masses was updated with the new masses and corroborates the existence of the deformed N =152 neutron shell closure for Md and Lr.

Desarrollo y aplicaciones de las tecnologías de radiotrazadores y ESCANEO gamma

Directory of Open Access Journals (Sweden)

Mario Conejo

2008-04-01

Full Text Available Las tecnologías de radiotrazadores y de escaneo gamma representan herramientas muy consolidadas para el estudio, análisis y evaluación de los procesos industriales. En este trabajo se reportan los resultados del desarrollo de las tecnologías de escaneo gamma y radiotrazadores en algunas aplicaciones de laboratorio y en sistemas de mayor complejidad. La tecnología de radiotrazadores fue empleada para estudiar la difusión de boro durante el proceso de curado de la madera, evaluar una laguna de tratamiento de aguas negras con plantas de lirio acuático y realizar experimentos con variables controladas en un circuito hidráulico de laboratorio (flow-rig. La técnica de escaneo gamma se utilizó para analizar una torre prototipo de nuestros laboratorios. Los principales resultados obtenidos en los experimentos fueron los siguientes: 1 la absorción de boro como agente de curado de la madera, es muy variable según sea la sección de la madera expuesta a la solución de curado; 2 durante las pruebas con radiotrazador Yodo 131 las plantas de lirio acuático de la laguna de tratamiento absorben parte del radiotrazador, lo que dificulta la determinación de los tiempos de residencia; 3 la sensibilidad que se obtiene al emplear un sistema con fuente de Cesio-137 y detector es lo suficientemente alta como para permitir detectar la presencia de materiales de baja absorción de radiación, dentro de columnas con paredes de acero.

La protección de datos en las aplicaciones móviles de diagnóstico de enfermedades genéticas. Un estudio jurídico

Directory of Open Access Journals (Sweden)

Francisca Ramón Fernández

2017-07-01

Full Text Available En el presente trabajo se realiza un análisis de los principales problemas jurídicos relativos a la protección de datos de carácter personal en el caso de las aplicaciones móviles de diagnóstico de enfermedades. El acceso a app por parte de consumidores que están interesados en la salud y diagnóstico puede provocar el hecho de que proporcionen información especialmente protegida, vulnerándose sus derechos. En la era de la denominada Internet de las cosas, el acceso ilimitado a la información contrasta con la necesidad de cumplir la legislación aplicable

Beyond the Score: Timbre Analysis in Avant-garde Music

Directory of Open Access Journals (Sweden)

Mario Baroni

2016-02-01

Full Text Available The article examines perceptual aspects of timbre within the context of avant-garde XX century music. An excerpt from a work by Luciano Berio was taken into account. We recorded it on 8 separate channels each of them devoted to small groups of homogeneous sounds, in order to obtain a global result that we could modify by subtracting one or more of the recorded groups. We prepared four different excerpts: one with the original version and three with modified versions. 50 participants (25 experts, 25 non-experts were invited to fill in a semantic differential bipolar scale made of 12 adjectives, 6 concerning emotional and 6 sensorial aspects of perception. We interpreted the subjects’ responses with the help of a spectrographic analysis and of studies on timbre verbalization. The main aim of our research was to explore the possibilities of timbre analysis, a field that so far has no solid scientific background. The research obtained promising responses from expert listeners, while non-experts manifested a sort of aesthetic refusal of this genre of music. Positive results were obtained also in the critical observations of possibilities and limits of spectrographic analysis and verbalizations of timbre. We hope that our initial data can be useful for future studies on timbre perception.

Microshutter Array Development for the Multi-Object Spectrograph for the New Generation Space Telescope, and Its Ground-based Demonstrator

Science.gov (United States)

Woodgate, Bruce E.; Moseley, Harvey; Fettig, Rainer; Kutyrev, Alexander; Ge, Jian; Fisher, Richard R. (Technical Monitor)

2001-01-01

The 6.5-m NASA/ESA/Canada New Generation Space Telescope to be operated at the L2 Lagrangian point will require a multi-object spectrograph (MOS) operating from 1 to 5 microns. Up to 3000 targets will be selected for simultaneous spectroscopy using a programmable cryogenic (approx. 35K) aperture array, consisting of a mosaic of arrays of micromirrors or microshutters. We describe the current status of the GSFC microshutter array development. The 100 micron square shutters are opened magnetically and latched open or closed electrostatically. Selection will be by two crossed one-dimensional addressing circuits. We will demonstrate the use of a 512 x 512 unit array on a ground-based IR MOS which will cover 0.6 to 5 microns, and operate rapidly to include spectroscopy of gamma ray burst afterglows.

Medidas de complejidad y de información como herramientas para el análisis de series temporales : aplicaciones al estudio de señales de origen electrofisiológicos

OpenAIRE

Mateos, Diego Martín

2016-01-01

Tesis (Doctor en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2016. El estudio estadístico de las series temporales ha sido abordado desde la matemática pura y en el contexto de diversas aplicaciones (metereología, finanzas, etc.). En los últimos años los métodos de estudio de las series temporales se han visto enriquecidos con conceptos y técnicas provistos por la Teoría de la Información y por herramientas provenientes de distintos c...

The Low-Resolution Spectrograph of the Hobby-Eberly Telescope. II. Observations of Quasar Candidates from the Sloan Digital Sky Survey

International Nuclear Information System (INIS)

Schneider, D. P.; Hill, Gary J.; Fan, X.; Ramsey, L. W.; MacQueen, P. J.; Weedman, D. W.; Booth, J. A.; Eracleous, M.; Gunn, J. E.; Lupton, R. H.

2000-01-01

This paper describes spectra of quasar candidates acquired during the commissioning phase of the Low-Resolution Spectrograph of the Hobby-Eberly Telescope. The objects were identified as possible quasars from multicolor image data from the Sloan Digital Sky Survey. The 10 sources had typical r' magnitudes of 19-20, except for one extremely red object with r ' ≅23. The data, obtained with exposure times between 10 and 25 minutes, reveal that the spectra of four candidates are essentially featureless and are not quasars, five are quasars with redshifts between 2.92 and 4.15 (including one broad absorption line quasar), and the red source is a very late M star or early L dwarf. (c) (c) 2000. The Astronomical Society of the Pacific

THE SPITZER INFRARED SPECTROGRAPH SURVEY OF T TAURI STARS IN TAURUS

International Nuclear Information System (INIS)

Furlan, E.; Luhman, K. L.; Espaillat, C.

2011-01-01

We present 161 Spitzer Infrared Spectrograph (IRS) spectra of T Tauri stars and young brown dwarfs in the Taurus star-forming region. All of the targets were selected based on their infrared excess and are therefore surrounded by protoplanetary disks; they form the complete sample of all available IRS spectra of T Tauri stars with infrared excesses in Taurus. We also present the IRS spectra of seven Class 0/I objects in Taurus to complete the sample of available IRS spectra of protostars in Taurus. We use spectral indices that are not significantly affected by extinction to distinguish between envelope- and disk-dominated objects. Together with data from the literature, we construct spectral energy distributions for all objects in our sample. With spectral indices derived from the IRS spectra we infer disk properties such as dust settling and the presence of inner disk holes and gaps. We find a transitional disk frequency, which is based on objects with unusually large 13-31 μm spectral indices indicative of a wall surrounding an inner disk hole, of about 3%, and a frequency of about 20% for objects with unusually large 10 μm features, which could indicate disk gaps. The shape and strength of the 10 μm silicate emission feature suggests weaker 10 μm emission and more processed dust for very low mass objects and brown dwarfs (spectral types M6-M9). These objects also display weaker infrared excess emission from their disks, but do not appear to have more settled disks than their higher-mass counterparts. We find no difference for the spectral indices and properties of the dust between single and multiple systems.

DYNAMICS IN SUNSPOT UMBRA AS SEEN IN NEW SOLAR TELESCOPE AND INTERFACE REGION IMAGING SPECTROGRAPH DATA

Energy Technology Data Exchange (ETDEWEB)

Yurchyshyn, V.; Abramenko, V. [Big Bear Solar Observatory, New Jersey Institute of Technology, Big Bear City, CA 92314 (United States); Kilcik, A. [Department of Space Science and Technologies, Akdeniz University, 07058 Antalya (Turkey)

2015-01-10

We analyze sunspot oscillations using Interface Region Imaging Spectrograph (IRIS) slit-jaw and spectral data and narrow-band chromospheric images from the New Solar Telescope (NST) for the main sunspot in NOAA AR 11836. We report that the difference between the shock arrival times as measured by the Mg II k 2796.35 Å and Si IV 1393.76 Å line formation levels changes during the observed period, and peak-to-peak delays may range from 40 s to zero. The intensity of chromospheric shocks also displays long-term (about 20 min) variations. NST's high spatial resolution Hα data allowed us to conclude that, in this sunspot, umbral flashes (UFs) appeared in the form of narrow bright lanes stretched along the light bridges and around clusters of umbral bright points. The time series also suggested that UFs preferred to appear on the sunspot-center side of light bridges, which may indicate the existence of a compact sub-photospheric driver of sunspot oscillations. The sunspot's umbra as seen in the IRIS chromospheric and transition region data appears bright above the locations of light bridges and the areas where the dark umbra is dotted with clusters of umbral dots. Co-spatial and co-temporal data from the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory showed that the same locations were associated with bright footpoints of coronal loops suggesting that the light bridges may play an important role in heating the coronal sunspot loops. Finally, the power spectra analysis showed that the intensity of chromospheric and transition region oscillations significantly vary across the umbra and with height, suggesting that umbral non-uniformities and the structure of sunspot magnetic fields may play a role in wave propagation and heating of umbral loops.

GLOBAL SAUSAGE OSCILLATION OF SOLAR FLARE LOOPS DETECTED BY THE INTERFACE REGION IMAGING SPECTROGRAPH

International Nuclear Information System (INIS)

Tian, Hui; He, Jiansen; Young, Peter R.; Reeves, Katharine K.; Wang, Tongjiang; Antolin, Patrick; Chen, Bin

2016-01-01

An observation from the Interface Region Imaging Spectrograph reveals coherent oscillations in the loops of an M1.6 flare on 2015 March 12. Both the intensity and Doppler shift of Fe xxi 1354.08 Å show clear oscillations with a period of ∼25 s. Remarkably similar oscillations were also detected in the soft X-ray flux recorded by the Geostationary Operational Environmental Satellites ( GOES ). With an estimated phase speed of ∼2420 km s −1 and a derived electron density of at least 5.4 × 10 10 cm −3 , the observed short-period oscillation is most likely the global fast sausage mode of a hot flare loop. We find a phase shift of ∼ π /2 (1/4 period) between the Doppler shift oscillation and the intensity/ GOES oscillations, which is consistent with a recent forward modeling study of the sausage mode. The observed oscillation requires a density contrast between the flare loop and coronal background of a factor ≥42. The estimated phase speed of the global mode provides a lower limit of the Alfvén speed outside the flare loop. We also find an increase of the oscillation period, which might be caused by the separation of the loop footpoints with time.

MSU 1.6 GeV/c beam analysis system

International Nuclear Information System (INIS)

Nolen, J.A. Jr.

1981-01-01

This report describes the design of the beam analysis system which is to prepare the beam for the large high-resolution spectrograph to be used with the superconducting heavy ion cyclotrons at MSU. The system has a momentum resolving power of over 20,000 with a 1 mm object slit and is of a very flexible, modular design which is readily adaptable to other applications

Aplicaciones del colgajo frontonasal para la cobertura de defectos nasales

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M. Pérez

2015-12-01

Full Text Available Presentamos una revisión retrospectiva de los pacientes a los cuales se realizó un colgajo frontonasal para la cobertura de defectos nasales intervenidos en la Unidad de Tumores Cutáneos de nuestro Servicio en el periodo comprendido entre enero de 2010 y mayo de 2014. El objetivo es analizar nuestras aplicaciones y resultados además de describir un algoritmo que permita indicar los distintos diseños en función de la localización y el tamaño del defecto a reparar. Empleamos el colgajo frontonasal en 78 pacientes (49 mujeres y 29 varones con un rango de edad de 47 a 92 años (media de 73 años. Creamos un total de 81 defectos, puesto que en 3 casos se resecaron simultáneamente 2 tumoraciones, todos de etiología tumoral (64 carcinomas basocelulares, 16 carcinomas espinocelulares y 1 caso de léntigo maligno melanoma, localizados en el área nasal, con un tamaño mínimo de 12 x 17 mm y máximo de 30 x 35 mm (media de 22 x 25 mm. El periodo de seguimiento fue de entre 2 meses y 4 años (media de 2,5 años. Respecto a las complicaciones observadas, todas ellas menores, hubo 6 casos de necrosis marginal, 8 de dehiscencia parcial de la herida y 1 de cicatrización hipertrófica, tratándose en su mayor parte de varones fumadores. Todos los colgajos sobrevivieron con resultado estético satisfactorio. El colgajo frontonasal permite la cobertura en un sólo tiempo quirúrgico de defectos nasales independientemente de su localización, de hasta 30 x 35 mm en nuestra serie. Se trata de un colgajo seguro y versátil en sus múltiples modificaciones, con unos resultados estéticos satisfactorios. Estas ventajas son de especial importancia en pacientes de edad avanzada como alternativa a técnicas más complejas. Se trata por lo tanto, a nuestro juicio, de una opción a tener en cuenta para la reconstrucción en un único tiempo quirúrgico de defectos nasales.

Radiochemical studies in chemical separation and spectrographic determination of rare earths in thorium oxide matrix (Preprint No. RA.06)

International Nuclear Information System (INIS)

Adya, V.C.; Dhawale, B.A.; Rajeshwari, B.; Bangia, T.R.; Sastry, M.D.

1989-01-01

A chemical separation procedure was standardised for the separation of traces of rare earths from ThO 2 matrix using HDEHP (Di 2-ethyl hexyl phosphoric acid). The studies were carried out using both nitric acid and hydrochloric acid medium in different concentrations. The extraction studies were also carried out using radioactive isotopes of rare earths viz. 141 Ce, 152-154 Eu, 153 Gd, 170 Tm etc. The extraction was effective in both media. In 0.1 M HDEHP/xylene and 3 M HNO 3 , Ce was partially extracted into organic phase. So HCl/xylene medium was chosen for extraction purposes. The recovery was confirmed by both gamma counting and emission spectropgraphic method. It was found to be quantitative within experimental error. The separation procedure development here was used for determination of rare earths in thorium oxide matrix by emission spectrographic method. (author)

Caracterización de la superaleación ODS MA 956 para aplicaciones biomédicas

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Escudero, M. I.

1998-05-01

Full Text Available Since the MA 956 was proposed as a possible new biomaterial due to its good corrosion resistance values in physiological fluids a long way, still not finished, has been done. An exhaustive characterization of this alloy at room temperature has been developed. The technological objectives are well established: the possible use of this material for biomedical applications as hip or knee prostheses and as dental implants. The study was performed comparing the results of this alloy with the materials used nowadays as surgical implants, i.e., titanium alloys and polyethylene.

Desde que la MA 956 fue propuesta como posible nuevo biomaterial en base a su buena resistencia a la corrosión frente a sueros fisiológicos, un largo camino, aún sin finalizar, se ha recorrido, en el que se ha llevado a cabo una caracterización exhaustiva de esta aleación a temperatura ambiente con fines tecnológicos bien definidos: su posible uso en aplicaciones biomédicas, bien sea como prótesis de cadera o de rodilla y para implantes dentales. Los estudios se han llevado a cabo comparando esta aleación con los materiales más comúnmente utilizados en implantes ortopédicos como aleaciones de titanio y polietileno.

Algumas aplicaciones del método cluster a la organización de la producción en talleres de tratamiento térmico

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Roberto Cespón Castro

1994-06-01

Full Text Available El trabajo expone algunas aplicaciones del método CLUSTER a la solución de problemas que se presentan en los talleres y secciones de tratamiento térmico, enfatizándose en las cuestiones relacionadas con el agrupamiento de piezas y la formación de células flexibles de fabricación, lo cual constituye la base para la introducción de todo un conjunto de técnicas y criterios de avanzada en la actividad productiva de estas instalaciones.This work deals with some applications of CLUSTER method for problem-solving in heat treatment workshoops and sections. The main aspects related to parts grouping and manufacturing flexible cells building are explained, as a basis for implementing a set of tools and advanced criteria to manufacturing activities at these facilities.

Hubble Space Telescope: Faint object spectrograph instrument handbook. Version 1.1

Science.gov (United States)

Ford, Holland C. (Editor)

1990-01-01

The Faint Object Spectrograph (FOS) has undergone substantial rework since the 1985 FOS Instrument Handbook was published, and we are now more knowledgeable regarding the spacecraft and instrument operations requirements and constraints. The formal system for observation specification has also evolved considerably, as the GTO programs were defined in detail. This supplement to the FOS Instrument Handbook addresses the important aspects of these changes, to facilitate proper selection and specification of FOS observing programs. Since the Handbook was published, the FOS red detector has been replaced twice, first with the best available spare in 1985 (which proved to have a poor, and steadily degrading red response), and later with a newly developed Digicon, which exhibits a high, stable efficiency and a dark-count rate less than half that of its predecessors. Also, the FOS optical train was realigned in 1987-88 to eliminate considerable beam-vignetting losses, and the collimators were both removed and recoated for greater reflectivity. Following the optics and detector rework, the FOS was carefully recalibrated (although only ambient measurements were possible, so the far-UV characteristics could not be re-evaluated directly). The resulting efficiency curves, including improved estimates of the telescope throughput, are shown. A number of changes in the observing-mode specifications and addition of several optional parameters resulted as the Proposal Instructions were honed during the last year. Target-brightness limitations, which have only recently been formulated carefully, are described. Although these restrictions are very conservative, it is imperative that the detector safety be guarded closely, especially during the initial stages of flight operations. Restrictions on the use of the internal calibration lamps and aperture-illumination sources (TA LEDs), also resulting from detector safety considerations, are outlined. Finally, many changes have been made to

Cool transition region loops observed by the Interface Region Imaging Spectrograph

Science.gov (United States)

Huang, Z.; Xia, L.; Li, B.; Madjarska, M. S.

2015-12-01

An important class of loops in the solar atmosphere, cool transition region loops, have received little attention mainly due to instrumental limitations. We analyze a cluster of these loops in the on-disk active region NOAA 11934 recorded in a Si IV 1402.8 Å spectral raster and 1400Å slit-jaw (SJ) images taken by the Interface Region Imaging Spectrograph. We divide these loops into three groups and study their dynamics, evolution and interaction.The first group comprises geometrically relatively stable loops, which are finely scaled with 382~626 km cross-sections. Siphon flows in these loops are suggested by the Doppler velocities gradually changing from -10 km/s (blue-shifts) in one end to 20 km/s (red-shifts) in the other. Nonthermal velocities from 15 to 25 km/s were determined. The obtained physical properties suggest that these loops are impulsively heated by magnetic reconnection occurring at the blue-shifted footpoints where magnetic cancellation with a rate of 1015 Mx/s is found. The released magnetic energy is redistributed by the siphon flows. The second group corresponds to two active footpoints rooted in mixed-magnetic-polarity regions. Magnetic reconnection in both footpoints is suggested by explosive-event line profiles with enhanced wings up to 200 km/s and magnetic cancellation with a rate of ~1015 Mx/s. In the third group, an interaction between two cool loop systems is observed. Mixed-magnetic polarities are seen in their conjunction area where explosive-event line profiles and magnetic cancellation with a rate of 3×1015 Mx/s are found. This is a clear indication that magnetic reconnection occurs between these two loop systems. Our observations suggest that the cool transition region loops are heated impulsively most likely by sequences of magnetic reconnection events.

UNDERCOVER EUV SOLAR JETS OBSERVED BY THE INTERFACE REGION IMAGING SPECTROGRAPH

Energy Technology Data Exchange (ETDEWEB)

Chen, N.-H. [Korea Astronomy and Space Science Institute, Daejeon (Korea, Republic of); Innes, D. E. [Max-Planck-Institut für Sonnensystemforschung, D-37077 Göttingen (Germany)

2016-12-10

It is well-known that extreme ultraviolet (EUV) emission emitted at the solar surface is absorbed by overlying cool plasma. Especially in active regions, dark lanes in EUV images suggest that much of the surface activity is obscured. Simultaneous observations from the Interface Region Imaging Spectrograph, consisting of UV spectra and slit-jaw images (SJI), give vital information with sub-arcsecond spatial resolution on the dynamics of jets not seen in EUV images. We studied a series of small jets from recently formed bipole pairs beside the trailing spot of active region 11991, which occurred on 2014 March 5 from 15:02:21 UT to 17:04:07 UT. Collimated outflows with bright roots were present in SJI 1400 Å (transition region) and 2796 Å (upper chromosphere) that were mostly not seen in Atmospheric Imaging Assembly (AIA) 304 Å (transition region) and AIA 171 Å (lower corona) images. The Si iv spectra show a strong blue wing enhancement, but no red wing, in the line profiles of the ejecta for all recurrent jets, indicating outward flows without twists. We see two types of Mg ii line profiles produced by the jets spires: reversed and non-reversed. Mg ii lines remain optically thick, but turn optically thin in the highly Doppler shifted wings. The energy flux contained in each recurrent jet is estimated using a velocity differential emission measure technique that measures the emitting power of the plasma as a function of the line-of-sight velocity. We found that all the recurrent jets release similar energy (10{sup 8} erg cm{sup −2} s{sup −1}) toward the corona and the downward component is less than 3%.

Evaluación de las aplicaciones aéreas de abamectin para el control químico del minador de los cítricos en la provincia de Tucumán Evaluation of aerial abamectin applications to control citrus leafminer in Tucumán province

Directory of Open Access Journals (Sweden)

Hernán Salas

2008-06-01

Full Text Available Desde fines de 1995, el minador de la hoja se ha convertido en una de las plagas más importantes de los cítricos de la región. El corto tiempo en que desarrolla sus generaciones, la disponibilidad de brotes nuevos durante el verano y la relación entre la plaga y la dispersión de la cancrosis obliga al productor a realizar hasta seis aplicaciones para su control. Operativamente, solo es posible pulverizar en forma terrestre 4 hectáreas por hora, mientras que por avión, en el mismo tiempo se tratan 100 hectáreas. El objetivo del presente trabajo fue evaluar la eficiencia del control de la plaga mediante un programa de manejo que incluye monitoreo y aplicaciones aéreas de abamectin entre los años 2002 y 2006. Se seleccionaron seis fincas comerciales aplicadas y seis sin tratar en dos zonas de la provincia. La aplicación se realizó con un avión Air Tractor equipado con micronaires empleando 20 l de agua, 5 l de aceite mineral y 1,8 g i.a. de abamectin (Vertimec 1,8%® por hectárea. El número de aplicaciones por campaña y por zona varió dependiendo de los resultados del monitoreo. Se extrajeron muestras semanalmente y se evaluó el porcentaje de hojas con larvas vivas. Al final de la experiencia se estimó el daño foliar en brotes previamente marcados. En las fincas tratadas con aplicaciones aéreas de abamectin, en todas las campañas evaluadas, el porcentaje de infestación del minador varió entre 15 y 34% y el de daño foliar entre 2 y 8% mientras que en las fincas testigo la infestación fue entre 35 y 60% y el daño foliar, entre 18 y 30%. El monitoreo de la plaga permitió ajustar el número de aplicaciones en cada año y zona para lograr un manejo racional del minador.Since 1995, the citrus leafminer has become one of the most important citrus pests in the region. Its short generation time, the availability of new flushes during summer and the relationship between the pest and canker spread, force citrus farmers to make up

THE DEEP BLUE COLOR OF HD 189733b: ALBEDO MEASUREMENTS WITH HUBBLE SPACE TELESCOPE/SPACE TELESCOPE IMAGING SPECTROGRAPH AT VISIBLE WAVELENGTHS

Energy Technology Data Exchange (ETDEWEB)

Evans, Thomas M.; Aigrain, Suzanne; Barstow, Joanna K. [Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH (United Kingdom); Pont, Frederic; Sing, David K. [School of Physics, University of Exeter, EX4 4QL Exeter (United Kingdom); Desert, Jean-Michel; Knutson, Heather A. [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States); Gibson, Neale [European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany); Heng, Kevin [University of Bern, Center for Space and Habitability, Sidlerstrasse 5, CH-3012 Bern (Switzerland); Lecavelier des Etangs, Alain, E-mail: tom.evans@astro.ox.ac.uk [Institut d' Astrophysique de Paris, UMR7095 CNRS, Universite Pierre et Marie Curie, 98 bis Boulevard Arago, F-75014 Paris (France)

2013-08-01

We present a secondary eclipse observation for the hot Jupiter HD 189733b across the wavelength range 290-570 nm made using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We measure geometric albedos of A{sub g} = 0.40 {+-} 0.12 across 290-450 nm and A{sub g} < 0.12 across 450-570 nm at 1{sigma} confidence. The albedo decrease toward longer wavelengths is also apparent when using six wavelength bins over the same wavelength range. This can be interpreted as evidence for optically thick reflective clouds on the dayside hemisphere with sodium absorption suppressing the scattered light signal beyond {approx}450 nm. Our best-fit albedo values imply that HD 189733b would appear a deep blue color at visible wavelengths.

Adaptación de un motor de combustión interna alternativo de gasolina para su funcionamiento con hidrógeno como combustible. Aplicaciones energética y de automoción

OpenAIRE

Sáinz Casas, David

2016-01-01

En esta tesis doctoral se presentan los trabajos de investigación realizados recientemente en la Universidad Pública de Navarra sobre la conversión de motores de gasolina para su funcionamiento con hidrógeno, así como el desarrollo de aplicaciones demostrativas prácticas empleando estos motores. Esta línea de investigación es continuación de la producción electrolítica de hidrógeno con energía eólica [15-17]. El objetivo principal de esta tesis es la demostración práctica de la viabilidad de ...

Análise visual de parâmetros espectrográficos pré e pós-fonoterapia para disfonias Visual analysis of spectrographic parameters before and after dysphonia therapy

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Marcela Guimarães Côrtes

2010-01-01

analyzed voice recordings of 67 dysphonic patients that had attended vocal therapy. Pre- and post-treatment spectrograms were analyzed by four speech-language pathologists. The following parameters were analyzed: spectrogram regularity, harmonic colors, spectrogram stability, presence of noise components, presence of harmonic and sub-harmonics. Data were submitted to statistical analysis, which aimed at identifying different patterns between genders and diagnoses. RESULTS: There was no difference between pre and post-therapy conditions for spectrogram regularity, however, most patients (58% showed improvement. Harmonic colors remained stable (p=0.000. Significant improvement was observed, after voice therapy, regarding spectrogram stability (p=0.006, and presence of noise (p=0.007, harmonics (p=0.000 and sub-harmonics components (p=0.001. No relation was found between patient's gender and spectrographic improvement. Regarding diagnoses, differences caused by therapy were only significant for spectrogram regularity. CONCLUSIONS: Not all evaluated parameters showed significant improvements with therapy, however, acoustic spectrography proved to be an efficient tool to evaluate patients' progresses during vocal rehabilitation, complementing auditory-perceptual evaluation and composing a multidimensional assessment protocol.

Principios de laboratorio y aplicaciones en la práctica clínica de las técnicas moleculares, genómicas y proteómicas

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Jenny Hernández Betancourt

2014-10-01

Full Text Available La heterogénea expresión clínica de las enfermedades, la necesidad de la interpretación de los procesos fisiológicos y fisiopatológicos, así como la búsqueda incesante de nuevas estrategias diagnósticas y terapéuticas, han conducido al desarrollo de las biociencias, en particular de la genética, la genómica, la biología molecular y las tecnologías asociadas. Han emergido en los últimos años disciplinas como la trascriptómica, la epigenómica, la proteómica y la metabolómica, cada una con un objeto de estudio determinado, que deriva de los tipos moleculares específicos y sus relaciones y todas con aplicaciones potenciales dentro de una nueva medicina con un enfoque personalizado. Hoy se dispone de técnicas moleculares que se basan en la hibridación de ácidos nucleicos, tanto in situ como el dot-blot, el Southern blot y el Northern blot. Otros métodos requieren la amplificación del ADN, como la reacción en cadena de la polimerasa, los microarreglos y la secuenciación. La proteómica se perfila como una potente herramienta para el estudio de aspectos fisiológicos y patológicos del ser humano; sus técnicas incluyen la electroforesis bidimensional, la espectrometría de masas y las micromatrices de proteínas. La búsqueda activa de biomarcadores a partir de casi todos los líquidos biológicos y tejidos de varias naturalezas es una de las principales aplicaciones de la proteómica. Es importante atender, comprender e introducir estos nuevos métodos en la práctica clínica por sus potencialidades para el diagnóstico, el desarrollo de estrategias terapéuticas, la predicción y estratificación de riesgo, de la resistencia al tratamiento y las posibilidades de supervivencia

Metodología y aplicaciones de la citometría de flujo para el inmunofenotipaje de las leucemias agudas

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Vianed Marsán Suárez

Full Text Available La citometría de flujo (CMF es una técnica de avanzada, altamente sensible y automatizada, que se emplea para el inmunofenotipaje de las células normales y leucémicas. En este artículo se muestran los principales aspectos metodológicos a tener en cuenta para un mejor desarrollo e interpretación del inmunofenotipo por CMF, entre los que se encuentran: tipo, cantidad, conservación y transportación de la muestra, uso de anticoagulantes, empleo de anticuerpos monoclonales y fluorocromos, lisado de hematíes, fijación celular, así como la calibración y compensación de la auto-fluorescencia. Finalmente, se exponen las principales aplicaciones de esta metodología para definir el estado de maduración celular leucémico, clasificar las leucemias agudas en distintos subtipos inmunológicos, identificar subgrupos de mal pronóstico y detectar fenotipos aberrantes. Todo lo anterior resulta de gran utilidad para el diagnóstico de la enfermedad mínima residual que permite estratificar a los pacientes en diferentes grupos de riesgo e individualizar el tratamiento antileucémico.

Structure and Dynamics of Cool Flare Loops Observed by the Interface Region Imaging Spectrograph

Energy Technology Data Exchange (ETDEWEB)

Mikuła, K.; Berlicki, A. [Astronomical Institute, University of Wrocław, Kopernika 11, 51–622 Wrocław (Poland); Heinzel, P.; Liu, W., E-mail: mikula@astro.uni.wroc.pl [Astronomical Institute, The Czech Academy of Sciences, 25165 Ondřejov (Czech Republic)

2017-08-10

Flare loops were well observed with the Interface Region Imaging Spectrograph ( IRIS ) during the gradual phase of two solar flares on 2014 March 29 and 2015 June 22. Cool flare loops are visible in various spectral lines formed at chromospheric and transition-region temperatures and exhibit large downflows which correspond to the standard scenario. The principal aim of this work is to analyze the structure and dynamics of cool flare loops observed in Mg ii lines. Synthetic profiles of the Mg ii h line are computed using the classical cloud model and assuming a uniform background intensity. In this paper, we study novel IRIS NUV observations of such loops in Mg ii h and k lines and also show the behavior of hotter lines detected in the FUV channel. We obtained the spatial evolution of the velocities: near the loop top, the flow velocities are small and they are increasing toward the loop legs. Moreover, from slit-jaw image (SJI) movies, we observe some plasma upflows into the loops, which are also detectable in Mg ii spectra. The brightness of the loops systematically decreases with increasing flow velocity, and we ascribe this to the effect of Doppler dimming, which works for Mg ii lines. Emission profiles of Mg ii were found to be extremely broad, and we explain this through the large unresolved non-thermal motions.

A SEARCH FOR SHORT-PERIOD ROCKY PLANETS AROUND WDs WITH THE COSMIC ORIGINS SPECTROGRAPH (COS)

Energy Technology Data Exchange (ETDEWEB)

Sandhaus, Phoebe H.; Debes, John H.; Ely, Justin; Hines, Dean C.; Bourque, Matthew [Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 (United States)

2016-05-20

The search for transiting habitable exoplanets has broadened to include several types of stars that are smaller than the Sun in an attempt to increase the observed transit depth and hence the atmospheric signal of the planet. Of all spectral types, white dwarfs (WDs) are the most favorable for this type of investigation. The fraction of WDs that possess close-in rocky planets is unknown, but several large angle stellar surveys have the photometric precision and cadence to discover at least one if they are common. Ultraviolet observations of WDs may allow for detection of molecular oxygen or ozone in the atmosphere of a terrestrial planet. We use archival Hubble Space Telescope data from the Cosmic Origins Spectrograph to search for transiting rocky planets around UV-bright WDs. In the process, we discovered unusual variability in the pulsating WD GD 133, which shows slow sinusoidal variations in the UV. While we detect no planets around our small sample of targets, we do place stringent limits on the possibility of transiting planets, down to sub-lunar radii. We also point out that non-transiting small planets in thermal equilibrium are detectable around hotter WDs through infrared excesses, and identify two candidates.

Fusión Borrosa de Estimadores para Aplicaciones de Control Basado en Imagen

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Carlos Perez-Vidal

2010-04-01

Full Text Available Resumen: El control visual es una disciplina de gran actualidad dentro del control de robots, y dentro de ésta, los algoritmos de predicción se usan para estimar la localización de objetos o características visuales proporcionadas por un sensor con retardo (cámara. Algunos de los algoritmos más utilizados son: el filtro de Kalman; los filtros alpha-beta/gamma (αβ/γ; el AKF; el SKF; etc. El mayor problema de algunos de ellos es conseguir que su implementación permita trabajar en aplicaciones con fuertes restricciones temporales o de tiempo real. En este artículo se presenta un nuevo método de predicción, denominado FMF, basado en la fusión o combinación borrosa de varios filtros, y por tanto con un alto coste computacional. En el artículo se estudia a través de simulación la mejora obtenida con la predicción del FMF respecto a los filtros individuales, lo que justifica su interés. Así mismo, se desarrolla su implementación de tiempo real en una FPGA empleando técnicas de paralelización y segmentado. La viabilidad, robustez y fiabilidad del algoritmo propuesto se ha comprobado mediante una aplicación experimental de control visual. Palabras clave: Métodos predictivos, algoritmos paralelos, sistemas fuzzy, visión por computador, control automático

Desarrollo rápido de software libre de alta calidad : Ingeniería de software asistida por computadora, enfocada en tareas, para agilizar el ciclo de vida de las aplicaciones, mediante mejora continua disciplinada a nivel personal

OpenAIRE

Reingart, Mariano A.

2015-01-01

El presente artículo resume el estudio, desarrollo e implementación de un marco de trabajo teórico/práctico para creación y mantenimiento ágil de software libre, orientado al desarrollo de aplicaciones empresariales centradas en datos (principalmente transaccionales, con bases de datos relacionales, lenguaje de programación dinámico e interfaces web y visuales). Se analiza el estado del arte respecto a proyectos libres y abiertos (producción por pares, fomento, motivación, diversidad, goberna...

Arcillas cerámicas: una revisión de sus distintos tipos, significados y aplicaciones

Directory of Open Access Journals (Sweden)

Díaz Rodríguez, L. A.

2002-10-01

Full Text Available Clay is a word which has many meanings depending on the use to which it is put. However, it is in the ceramic field where the application of clay began and so it is here where this work will try to find a definition and establish a classification based on ceramic-geological criteria. The different kinds of clays found in Nature and their mineralogy are discussed in detail. Their properties and main uses are pointed out and finally the geographical and geological distribution of Spanish clays which have ceramic applications is presented.

La palabra arcilla posee un significado muy distinto según sea el ámbito industrial o científico de su utilización. Aunque hoy en día las aplicaciones de las materias primas arcillosas son muy variadas, es en el ámbito cerámico donde reside el primer origen de su consumo. Por tanto, es aquí donde se ha centrado este trabajo para exponer, en primer lugar, una definición del concepto arcilla y, con posterioridad, establecer una clasificación de las arcillas según criterios cerámico-geológicos. Se describen los distintos tipos existentes en la Naturaleza y se hace mención a su mineralogía, propiedades en general y usos principales. Finalmente, se exponen las arcillas españolas de aplicación cerámica, y su distribución dentro del territorio español.

Assessment methodology of the summer time schedule change (CHV) in Mexico: 10 years of application; Metodologia de evaluacion del cambio de horario de verano (CHV) en Mexico: 10 anos de aplicacion

Energy Technology Data Exchange (ETDEWEB)

Maqueda Zamora, Martin Roberto; Perez Rebolledo, Hugo [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

2008-07-01

medio ambiente dependen del uso eficiente de la energia. Con la aplicacion del horario de verano, todo el pais participa en el cuidado de los recursos energeticos que se derivan de su aplicacion y genera en la poblacion una cultura del cuidado de la energia y el medio ambiente. Este programa se aplica a nivel mundial, incluyendo a los paises industrializados. En este trabajo se presenta la metodologia implementada por el Instituto de Investigaciones Electricas (IIE), para realizar los calculos de ahorro en consumo de energia electrica y la cuantificacion de la demanda evitada, asi como los principales resultados obtenidos en 10 anos de aplicacion de la medida en Mexico.

Mass spectrographic analysis of selected chemical elements by microbial leaching of zircon

International Nuclear Information System (INIS)

Becker, S.; Dietze, H.J.; Bullmann, M.; Iske, U.

1986-01-01

Spark source mass spectrometry is a useful method for chemical element analysis of geological and biological samples. This sensitive technique (detection limit down to the ppb-range) is used to analyze leaching processes by means of several microorganisms. The problem of microbial leaching of chemical resistent materials was tested under laboratory conditions with regard to possible analytical and technical applications. Leaching of metals with chemolithotrophic and heterotrophic, organic acids producing microorganisms has been investigated with zircon from the Baltic Shield containing 0.7% rare earth elements and 1.67% hafnium. When zircon is leached with strains of thiobacillus ferrooxidans about 80% of the rare earth elements, Hf, Th and U can be recovered. (orig.) [de

Extended analysis of six-times ionized barium (Ba VII)

International Nuclear Information System (INIS)

Sharma, M.K.; Tauheed, A.; Rahimullah, K.

2013-01-01

The seventh spectrum of barium (Ba VII) has been investigated using experimental recordings made on a 3-m normal incidence vacuum spectrograph in Canada in the wavelength region 300–2000 Å. The data below 350 Å was supplemented from the spectrograms recorded on a 10.7-m grazing incidence spectrograph of NIST laboratory USA. The sources used to excite the spectra in both the cases were triggered spark. Previously reported levels of 5s 2 5p 2 , 5s5p 3 , 5s 2 5p5d and 5s 2 5p6s in Ba VII have been confirmed except the 1 P 1 level of 5s 2 5p5d. The analysis has been extended considerably to include new configurations 5s 2 5p6d and 5s 2 5p7s in odd parity configuration and doubly excited configurations 5s 2 5p6p, 5s 2 5p4f, 5s 2 5p5f, 5p 4 , 5s5p 2 5d and 5s5p 2 6s in even parity configuration. The 3 F 4 level of 5s 2 5p5d configuration has now been established through the identification of transitions from 5s 2 5p6p. In all, one hundred twenty-two levels have been established in this spectrum out of which ninety-two are new. A configuration interaction Hartree–Fock calculation supports the analysis. -- Highlights: ► The spectrum of Ba was recorded on a 3-m spectrograph with triggered spark source. ► Atomic transitions for Ba VII were identified to established new energy levels. ► CI calculations with relativistic corrections were made for theoretical predictions. ► Weighted oscillator strength (gf) and transition probabilities (gA) were calculated

Hibernate and spring - An analysis of maintainability against performance

Directory of Open Access Journals (Sweden)

Danny Alejandro Alvarez-Eraso

2016-01-01

Full Text Available Los frameworks para el desarrollo de aplicaciones web y las herramientas ORM permiten reducir el tiempo y esfuerzo al producir aplicaciones de software de calidad. Se han hecho estudios comparativos sobre estas herramientas pero dado que son numerosas y heterogéneas, escoger la más adecuada no es fácil. Hay estudios comparativos sobre estas herramientas, sin embargo no consideraron un dominio suficientemente complejo que permitan medir más precisamente sus ventajas y desventajas. Para aportar en la solución, comparamos el tiempo de respuesta de diferentes consultas en un dominio más complejo y con diferentes tamaños de base de datos. La comparación basada en este aspecto es importante ya que los ORM son un factor de mantenibilidad importante y porque consultas no optimizadas pueden conducir a cuellos de botella.