showing 36 of ~574560 from 574555 documents
Enantiomeric ratios of pantolactone, solerone, 4-carboethoxy-4-hydroxy-butyrolactone and of sotolon a flavour impact compound of flor-sherry and botr…
1992
La comunicación y el conflicto en las organizaciones
1992
Localization within chloroplasts of protoporphyrinogen oxidase, the target enzyme for diphenylether-like herbicides
1992
International audience
On Fixed Point (Trial) Methods for Free Boundary Problems
1992
In this note we consider the trial methods for solving steady state free boundary problems. For two test examples (electrochemical machining and continuous casting) we discuss the convergence of a fixed point method. Moreover, using the techniques of shape optimization we introduce a modification of the method, which gives us superlinear convergence rate. This is also confirmed numerically.
La utilización educativa en la formación del profesorado de ciencias
1992
Carte sensorielle d'eaux gazeuses : une application du vocabulaire libre et de l'analyse procusteenne
1992
National audience
Bis-cyclohexyl-crown-ethers as allosteric carriers
1992
Abstract Several bis-cyclohexyl-crown-ethers have been synthesized and used as carriers for alkaline cations. These compounds should all show negative allosteric cooperativity, but only 1 exhibits an odd cation transport behavior across the liquid organic membranes.
The global cracking laws for a finite-element model of no-tension material
1992
Abstract For perfect no-tension materials (NRT) the validity of the local stability postulate of Drucker, well known in plasticity, has been assumed so far and utilized to derive the local cracking laws, which relate cracking strain states and stress states to each other. On this base a finite-element (FE) model with suitable constitutive behaviour for the single FE is presented. Classical FE approaches enforce the cracking laws at the Gauss points of the FEs. In this work it is shown that taking into account cracking strains, suitably modelled, over the whole domain of the FE and making use of an energy approach lead to general cracking laws describing the constitutive behaviour of the who…
La selection et la formation d'un jury de degustateurs
1992
National audience
Cavanilles y los problemas sanitarios de la Ilustración
1992
El presente trabajo aborda un acercamiento a la situación sanitaria de las poblaciones valencianas durante la Ilustración y algunos de sus principales problemas, a través del testimonio del naturalista Antonio Jose Cavanilles. Se analiza la noción de contagio, la dimensión social y económica de un problema sanitario, como era el paludismo vinculado al cultivo del arroz, sus testimonios acerca de la incidencia de determinadas enfermedades, las epidemias de viruela y la variolizacion, el empleo de aguas minero-medicinales, los remedios populares contra la rabia y la mordedura de serpiente y su testimonio de las condiciones higiénicas y asistenciales de la población.
Les sacrifices d'animaux chez les Gaulois.
1992
Ouvrage de vulgarisation
Estrategias de automanejo en situaciones aversivas : un estudio comparativo
1992
A note on Δn ≠ 0 Stark transitions in hydrogenlike atoms
1992
In a gaseous helium or hydrogen target slow muons or antiprotons are captured into orbits with a high principal quantum number (n = 15 to 50) to form (μ− α)+ ions, (pα)+ ions, or (pp) atoms respectively. In the subsequent deexcitation process Stark mixing of the intermediary states plays an important role. The successful Mainz Cascade Model assumed Δn = 0 for the Stark transitions, although formally no such selection rule exists. This note examines the reasons why Δn ≠ 0 Stark transitions play only a negligible role in the deexcitation cascade.
Cardiovascular effects of impulse noise, road traffic noise, and intermittent pink noise at LAeq = 75 dB, as a function of sex, age, and level of anx…
1992
In a previous paper, in which the experimental conditions of the present research are fully described (Parrot et al., this issue), heart rate (HR) was studied in 60 male and in 60 female subjects in response to a pile-driver noise (P), a gunfire noise (G), a road traffic noise (T), and an intermittent pink noise (R), all noises being emitted at the same LAeq = 75 dB for 15 min. Digital pulse level (PL) responses were concomitantly surveyed by the use of pulse oximetry, allowing continuous arterial oxygen saturation (SaO2) readings. An index of pulse reactivity (PRI) could be calculated. Arterial blood pressure was measured 7 times from the beginning to the end of each trial. At rest, within…
The Asynchronous Leontief Model
1992
International audience; The traditional dynamic Leontief model is synchronous: every vertex acts simultaneously. A model with delays of action has been proposed, but it still remains synchronous. In this paper we propose an asynchronous version of the model that allows realistic computations. We fiurnish an algorithm and a program.
Bibliographia medica hispanica 1475-1950 :Volumen III, Libros y Folletos, 1701-1800
1992
Los repertorios y bases de datos de publicaciones científicas españolas, asociados a su análisis bibliométrico, semántico-documental y prosopográfico, constituyen una de las principales líneas de trabajo del Instituto de Estudios Documentales e Históricos sobre la Ciencia. En los siete primeros volúmenes de la “Bibliographia Medica Hispanica” se han incluido libros y folletos de tema médico impresos hasta 1950 y publicados en España o escritos por españoles desde el último cuarto del siglo XV hasta la primera mitad del XX. El volumen octavo está dedicado a las revistas médicas impresas en España hasta 1950. //. Els repertoris i bases de dades de publicacions científiques espanyoles, associa…
El XV Congreso Internacional de Psicologia (Bruselas, 1957)
1992
En una época especialmente relevante para el surgimiento de la moderna Psicología, se celebró en Bruselas el XV Congreso Internacional de Psicología. El presidente de esta reunión fue Albert Michotte y a ella asistieron un total de 1256 investigadores. En la reunión se presentaron un total de 329 trabajos, siendo la sensación y percepción, la Psicometría, la Psicología social y la Psicología fisiológica, los ámbitos que despertaron mayor interés entre los Investigadores. En este congreso destaca el gran número de trabajos presentados por investigadores de Estados Unidos, lo que muestra de manera clara el gran despliegue de la psicología Americana frente a la Europea.
What does computer support for cooperative work mean? a structurational analysis of computer supported cooperative work
1992
Abstract Technical developments in electronic communication and computing coupled with new understanding of relationships between computers and work processes has given impetus to a significant amount of research in the area of Computer Supported Cooperative Work (CSCW). Much of this work, however, lacks strong theoretical foundations, and there is no clear definition of CSCW, the major research questions of the field, or appropriate strategies for research. In this paper we suggest Giddens' theory of structuration as a conceptual foundation for CSCW research and propose a formal definition for CSCW. We conclude by discussing seven implications of the framework for future research into: (a)…
Evolución del área cívica saguntina
1992
Apphton Klage Um Das Tote Kind
1992
Light exposure patterns in schizophrenia
1992
Spontaneous light exposure patterns were studied in 10 chronic schizophrenic patients. Half of our schizophrenic patients exposed themselves to bright light exceeding ordinary indoor illumination. There was a significant positive correlation between the percentage of exposure to bright light and the Brief Psychiatric Rating Scale subscore anergia and a significant negative correlation with depression.
Production of strange particles in the hadronic decays of the Z0
1992
Abstract An analysis of the production of strange particles from the decays of the Z 0 boson into multihadronic final states is presented. The analysis is based on about 90 000 selected hadronic Z 0 decays collected by the DELPHI detector at LEP in 1990. K s 0 , K ∗± , Λ( Λ ) and Ξ − ( Ξ + ) have been identified by their characteristic decays. The measured production cross sections are compared with predictions of the Lund Monte Carlo tuned to data at PEP/PETRA energies.
Aufnahme und Phototoxizität von Hämatoporphyrinderivat in normalen und malignen Zellen
1992
Die Photodynamische Therapie (PDT) stellt neben der Chemo-, Radio- und chirurgischen Therapie ein neues alternatives Therapiekonzept in der Behandlung von malignen Tumoren dar. Das Prinzip beruht auf der systemischen Applikation (i.v. Injektion) einer photosensibilisierenden Substanz, z.B. Hamatoporphyrinderivat (HPD), und der nachfolgenden Bestrahlung mit Licht geeigneter Wellenlange, z.B. Laserlicht (630 nm). Fur die tumorselektive Wirkung dieser Therapie werden die selektive Aufnahme bzw. vermehrte Speicherung der photoaktiven Substanzen im Tumorgewebe [1] sowie auch eine im Vergleich zum Normalgewebe erhohte Sensibuitat von Tumorgewebe gegenuber der PDT postuliert. Ungeklart ist, ob die…
Myoedema
1992
Stationary muscle mounding after muscle percussion without electrical muscle activity is called myoedema. Out of 105 patients with different neurological diseases, 88% had this phenomenon. Muscle conduction velocity and stimulated single fiber EMG disclosed no abnormalities. Myoedema is a normal physiological phenomenon, and its presence does not indicate a neuromuscular disorder.
LOCAL-MOMENT AND ITINERANT ANTIFERROMAGNETISM IN THE HEAVY-FERMION SYSTEM CE(CU1-XNIX)2GE2
1992
Elastic and inelastic neutron-scattering studies on the system Ce(Cu1−xNix)2Ge2 are reported. These measurements are complemented by measurements of the magnetic susceptibility, high-field magnetization, heat capacity, thermal expansion, electrical resistivity and thermopower. The results reveal an interesting T-x phase diagram consisting of two different antiferromagnetic phases for x 0.5. Further experimental evidence for different types of antiferromagnetic ordering derives from a line-shape analysis of the quasielastic neutron-scattering intensity, from magnetization and thermopower experiments.
Centralismo borbónico y pervivencias forales: La reforma del gobierno municipal de la ciudad de Alicante (1747)
1992
Capital y depreciación : una aproximación endógena
1992
Fiabilidad diagnóstica comparativa de la mielografía y de la tomografía axial computarizada en la hernia discal lumbar
1992
Un grupo de 137 pacientes con hernia discal lumbar fue estudiado retrospectivamente , contrastando los hallazgos quirúrgicos con los proporcionado s por la mielografía y la tomografía axial computarizada (TAC), con objeto de comparar la fiabilidad de ambas técnicas de diagnóstico. La hernia discal correspondió al nivel L5-S1 en 76 pacientes y al L4-L5 en 61. Preoperatoriamente se había efectuado una TAC lumbar en 99 paciente s y una mielografía en 77. En 39 casos se efectuaron ambas exploraciones. La fiabilidad diagnóstica cuantificada por el porcentaje de resultados "verdaderos positivos" fue similar en ambas exploraciones, elevándose al 89% y 90% para la TAC y la mielografía respectivamen…
Justice et inégalités: un amendement à la théorie de John Rawls
1992
National audience; On se demande si les principes de justice de Rawls ne sont pas exagérément inégalitaires, malgré leur côté "juste". On examine donc ce qu'il advient de l'optimum de Rawls, le maximin, quand de l'aversion pour l'inégalité" apparaît. Le maximin consiste à se placer sur un certain point de la courbe d'efficience, en admettant une certaine dose d'inégalité, pourvu que l'on donne le maximum possible aux plus défavorisés. On tient compte d'externalités en reprenant la notion d'envie sous la forme d'une aversion pour l'inégalité, essentiellement de la part des plus défavorisés. On ne peut plus raisonner sur la courbe frontière des rémunérations possibles et on démontre la validi…
Überprüfung der Präzision von Kapnometern
1992
Capnometry, i.e. measurement of CO2 concentration (cCO2, vol%) and calculation of the respective CO2 partial pressure (pCO2, mmHg), is simple to apply, but the user must understand its principles of operation in order to appreciate its power and its limitations. However, sidestream capnometers use to dry the humidified respired gas (37 degrees C, pH2O 47 mmHg) for methodological reasons, thus increasing pCO2 by ca. 6% which, in turn, requires correction. With infrared spectroscopy, overestimation of pCO2 in presence of N2O and underreporting of pCO2 in presence of O2 also require to be corrected. These require either knowledge of the respective gas concentrations (mainstream analyzers) or a…
Organochlorines as Environmental Tainting Substances: Taste Panel Study and Chemical Analyses of Incubated Mussels
1992
Lake mussels (Anodonta piscinalis) incubated in freshwater stations upstream and downstream of a large pulp mill were studied for tainting by a panel of 18 persons. The tasted animal muscle and tissue water samples, and composites of other simultaneously incubated mussels were analyzed for organochlorine compounds. Bad taste scores were obtained for mussels from the nearest station downstream to the pulp mill and were significantly (p < 0.001 **) higher than those from other stations. A similar difference was observed for the measured chlorophenol, chloroanisole and chloroveratrole, chlorocymene and PCB contents. Chloroanisoles and chloroveratroles were indicated to form the main tai…
HERMIA - GENERAL DESCRIPTION
1992
Valencia y Sevilla en el sistema económico genovés de finales del siglo XV
1992
Metafísica y Teoría del conocimiento
1992
El estatuto de la Teoría del Conocimiento dentro de la República, afortunadamente un tanto anárquica. de la Filosofía ha sido cuestionado desde su aparición en la segunda mitad del siglo XIX hasta hoy. Cuando el hegelianismo la desterraba del saber filosófico, los neokantianos la reivindicaban como area específica de análisis del alcance y límites del conocimiento humano. En el siglo XX el Círculo de Viena discutió el estatuto epistemológico de la Teoría del Conocimiento (con una evidente huida hacia el campo de la «meta»: metaepistemología de la epistemología), justamente porque quería convertirla en el fundamento del fuego antimetafisico; pero una vez fracasado el proyecto inquisitorial d…
Actitudes y discursos sobre la maternidad en la España del siglo XVIII: la cuestión de la lactancia
1992
Actitudes y discursos sobre la maternidad en la España del siglo XVIII: la cuestión de la lactancia
Polarization effects in exclusive semi-leptonic Λc and Λb charm and bottom baryon decays
1992
Abstract We discuss polarization effects in semi-leptonic decays of polarized and unpolarized heavy Λ-type baryons into heavy and into light Λ-type baryons. We use the non-leptonic decay of the daughter baryon and the leptonic decay of the Woff-shell into a lepton pair as polarization analyzers to analyze the polarization of the daughter baryon and the Woff-shell. Technically this is done by writing down joint angular decay distributions. We calculate the values of the various asymmetry parameters that characterize the angular dependence of the angular decay distributions where we use the predictions of the heavy quark effective theory (HQET) supplemented by simple ansatze for the q2-depend…