showing 36 of ~574560 from 574555 documents
Kokkolan nuorisoasteen koulutuskokeilun alkuvaiheet opiskelijoiden näkökulmasta
1993
A propos des journées de l'AFSE à Dijon : le retour de l'économie des ressources humaines
1993
International audience
L'habitat La Tène ancienne de Rosheim "Mittelweg" (Bas-Rhin)
1993
Análisis de la mortalidad en pacientes con fracturas subcapitales de cadera
1993
El objetivo del presente trabajo es realizar un estudio analítico restrospectivo de la mortalidad de una serie de 528 fracturas subcapitales de cadera en 523 pacientes tratados en nuestro centro mediante prótesis cérvico-cefálica cementada durante el periodo de 1978-1986. De estos 523 pacientes, 190 (36%) habían fallecido en el momento de realizar el estudio. Hemos analizado la mortalidad hospitalaria, 47 casos (9%) y 6 meses después de la intervención, 104 (20%). Se han demostrado como factores de alto riesgo: edad superior a 85 años, presentar tres o más enfermedades asociadas, complicaciones generales en el postoperatorio (escaras, tromboembolismo pulmonar, infarto agudo de miocardio, ne…
Reconciling dark matter, solar and atmospheric neutrinos
1993
We present models that can reconcile the solar and atmospheric neutrino data with the existence of a hot dark matter component in the universe. This dark matter is a quasi-Dirac neutrino whose mass $m_{DM}$ arises at the one-loop level. The solar neutrino deficit is explained via nonadiabatic conversions of electron neutrino to a sterile neutrino and the atmospheric neutrino data via maximal muon neutrino to tau neutrino oscillations generated by higher order loop diagrams. For $m_{DM} \sim 30$ eV the radiative neutrino decay can lead to photons that can ionize interstellar hydrogen. In one of the models one can have observable $\nu_e$ to $\nu_\tau$ oscillation rates, with no appreciable mu…
Uses of change-over designs and repeated measurements in sensory and consumer studies
1993
Abstract The paper illustrates two statistical methods, the design and analysis of sensory experiments taking into account the effects of serving order and previously assessed treatment and the analysis of experiments with time repeated measurements. Change-over design experiments balance both presentation order and carry-over effects. The proper analysis of variance allows the testing of these effects and the estimation of product means adjusted for carry-over effect. Repeated measurements occur when groups are being compared over time. Either a corrected split-plot or a multivariate analysis of variance (MANOVA) with measurements at different times forming the variable should be adopted t…
Dal Prater al Danubio
1993
L'escriptura àrab en la pintura gótica
1993
Altruisme et modèle métaphorique
1993
This article addresses the relationship between economics and biology from the specific methodological perspective of concept transfers. To understand in what way biological theories may prove useful for the study of economic problems, we define, with reference to the work of some philosophers of science, a methodological tool which we call the "metaphorical model". This instrument is then used to elucidate some aspects of Becker's model on altruism as well as the reasons why his analysis has not been considered in the end to be fully convincing or relevant.
¿Qué sucede con la enseñanza de la óptica?
1993
This article provides an analysis about the introduction of basic conceptions of optics, the degree of comprehension by students and the preconceptions they already have. In order to chek our hypothesis we have made use of questionnaires to evaluate textbook, teachers and students.
La ejecución provisional laboral en Italia después de la reforma de 1990
1993
A diferencia del proceso laboral español, donde es potestativo pronunciar in voce la sentencia (bien de forma completa o bien sólo el fallo), en el proceso laboral italiano, al terminar el juicio oral y de acuerdo con el art. 429 del Codice di procedura civile (C.p.c.), el juez debe dictar oralmente la sentencia aunque sólo el fallo, mientras el texto completo de la misma se ha de depositar en la cancelleria en el plazo de quince días desde su pronunciamiento (art. 430 C.p.c.). Por otra parte, es importante resaltar que, según el art. 431 C.p.c., la sentencia tiene eficacia ejecutiva inmediata cuando es de condena y a favor del trabajador o del empresario. Por tanto, podemos afirmar que est…
Présentation des exploitations locales des enquêtes CEREQ
1993
International audience
La localització de la indústria taulellera a la Plana de Castelló
1993
El gran creixement económic asolfi per la Plana de Castelló es deu principalent l’auge de la seua indústria taulellera. Dins el País Valencià, aquest subsector industrial és el que més ha crescut durant els últims anys, havent duplicat el seu volum d’exportació en el curt període comprés entre 1986 i 1992. La indústria taulellera en aquesta comarca es çaracteritza per una llarga tradició d’artesans, i posteriorment industrials, que culmina als anys vuitantes amb una adequada reconversió que ha possibilitat un alt grau de modernització i competitivitat en la mateixa. En aquest article s’estudia primerament la localització daquesta indústria a nivell de la C.E.E., on la Plana produeix quasi u…
¿Málaga o Màlega? El problema de l'exotoponímia a la llum de la llengua antiga
1993
Analysis of resveratrol in Burgundy wines
1993
Recent studies have shown that resveratrol (3,5,4'‐trihydroxystilbene), a phytoalexin related to grape disease resistance, could occur in American and Bordeaux wines. It was also suggested that resveratrol might have cardioprotective activities in humans, as a result of drinking wine. We report here the presence of this compound in Burgundy wines. Analysis of resveratrol in wine was carried out using gas chromatography and gas chromatography—mass spectrometry.
Definition des Endes einer Major Depression in DSM-III-R
1993
Bereits 1981 forderten Keller und Shapiro eine auf klinischen Daten basierende Definition des Endes einer Major Depression Episode. Frank et al. betonten 1991 die Notwendigkeit empirisch validierter Definitionen fur die Verlaufserfassung depressiver Erkrankungen. Wir haben an den Verlaufsdaten von 66 Patienten mit einer nonbipolaren Major Depression Episode nach DSM-III-R die 5 anhand des Diagnosekonstrukts moglichen Definitionen eines Episodenendes miteinander verglichen und anhand zweier unabhangiger Ausenkriterien bewertet. Es zeigte sich, das je nach Definition des Episodenendes die Episodenlange stark variiert. So liegt der Median der Episodenlange unter der Forderung des volligen Vers…
En torno a la novela histórica: aproximación a un inventario
1993
Weiterentwicklung der maschinellen Beatmung mit Hilfe des nichtlinearen Zweikompartimentmodells
1993
Unter der folgenden Hypothese tragen die Modellstudien zur Weiterentwicklung der maschinellen Beatmung bei: Das nichtlineare Zweikompartimentmodell der Lunge eroffnet die Moglichkeit, die maschinelle Beatmung anhand der Modellparameter der beiden Lungenkompartimente einzustellen bzw. hierdurch zu steuern.
Penile Abflußvenenokklusion: Vergleich von erektiler Funktion und Kavernosometrie vor und nach perkutanen Eingriffen
1993
After percutaneous transpenile or retrograde venous occlusion for the treatment of a cavernous leak, the clinical results were correlated with cavernosometric flow measurements in 27 patients. In 15 patients, venous occlusion led to a reduction of the maintenance flow: in patients who showed improvement there was an average reduction of 30 ml/min, in those without improvement or deterioration it averaged 0.3 or 13 ml/min respectively. In 7 patients there was increased flow (up to +21 ml/min). One of these patients showed improved erectile function; the remaining 6 showed no change as was also the case in 5 other patients who had no change in cavernosometric measurements. Our findings sugges…
Le militantisme communiste durant l'entre-deux-guerres, permanences et transformations
1993
Diners i crèdit: els jueus d'Alzira en la segona meitat del segle XIV
1993
Monnaie endogène, refinancement bancaire et offre de crédit
1993
Post Keynesians have developped the view that credit availability is fundamentally determined by demand-side pressures. However, two aproaches o f money supply endogeneity are here distinguished : full and partial accommodation by central banks of reserve needs arising from bank lending. In the first case, central banks only set the supply price but not the supply quantity of reserves, in the second they can and do control reserve quantities. We examine the major implications of these theories on short term interest rates determination, management practices (particularly liability management) of commercial banks, financial innovations and quantity rationing by banks. We try to show that bot…
La política de telecomunicaciones en el País Valenciano y su impacto sobre el territorio
1993
El presente artículo analiza el impacto espacial de la política de telecomunicaciones llevada a cabo por la Generalitat Valenciana bajo el nombre del Programa IRTA, patrocinado en parte por la Comunidad Europea. El impacto de las nuevas tecnologías puede perjudicar a un desarrollo regional equilibrado si no existe una buena política en este sentido, por otra parte sus múltiples posibilidades de uso las convierten en un instrumento clave en las zonas más desfavorecidas.
Microscopic calculations of the hipernucleus λ5He
1993
Ground state results for the hypernucleus λ5He are reported. They have been calculated with a variatonal Jastrow-like trial wave function and also within the Diffusion Monte Carlo method. Simple central potential have been used to describe NN and λN interactions. The validity of the rigid core approximation is discussed. Guardiola Barcena, Rafael, Rafael.Guardiola@ific.uv.es Navarro Salas, Jose, Jose.Navarro@ific.uv.es
Bestimmt die Episodenzahl den Ausgang unipolarer Depressionen?
1993
Bei affektiven Psychosen wissen wir noch nicht ausreichend, wie eng die verschiedenen Parameter des Verlaufs und des Ausgangs miteinander korreliert sind. Eine wichtige, bisher nicht geklarte Frage ist, ob die psychosoziale Anpassung bei unipolaren Depressionen von einem phasenhaften Krankheitsverlauf abhangig ist. Ziel unserer Untersuchung war es, zu prufen, ob Patienten mit der Erstmanifestation einer Major Depression funf Jahre nach Indexuntersuchung eine bessere psychosoziale Anpassung erreichen als Patienten mit fruheren Episoden.
Ziel der eigenen vorliegenden Arbeiten
1993
Ziel dieser Untersuchung ist es, die verschiedenen Versionen der Hamilton-Depressionsskala (17-Item-Version, 21-Item-Version, die isolierten Subskalen der HAMD) und die neuen alternativen Skalen MADRS und BRMS an demselben Kollektiv depressiver Patienten vergleichend auf ihre Reliabilitat und Validitat zu prufen. Vergleichende Analysen von Schweregradskalen sind notwendig, um unter den konkurrierenden Schweregradskalen jene zu finden, die am besten als Indikator fur die Intensitat depressiver Syndrome geeignet ist. Mit Ausnahme der Arbeit von Maier und Philipp (1985a) vergleichen die in der Literatur verfugbaren Arbeiten maximal 2 Skalen; die verwendeten Reliabilitats- und Validitatskriteri…
Effects of cadmium exposure on the ultrastructure of hepatopancreatic cells of Thais haemastoma (gastropoda, prosobranchia)
1993
Abstract Specific histopathological parameters have been proposed as good indicators of heavy-metal pollution. Hence the study of ultrastructural alterations in target organs from sentinel animals after heavy-metal exposure may provide a useful tool in understanding the cellular role in heavy-metal metabolism. The main purpose of this study was the determination of the ultrastructural changes in the different hepatopancreatic-cell types of Thais haemastoma after experimental exposure to cadmium. Specimens of this species from the Gulf of Valencia were exposed to sublethal doses of cadmium during a period of 96 h. The hepatopancreas was excised and prepared in a routine manner for electron m…
Didáctica de las ciencias experimentales y sociales
1993
Resumen tomado del autor. Resumen también en inglés Los problemas experimentales reúnen las virtudes de los problemas de lápiz y papel y de las prácticas de laboratorio en Física; ellos pueden ser utilizados para introducir conocimientos teóricos sobre una base experimental y también para aplicar en la práctica dichos conocimientos. El propósito de este artículo es analizar la importancia de tales problemas y mostrar algunos ejemplos de ellos. Valencia Universidad de León. Facultad de Educación. Servicio de Biblioteca; Campus de Vegazana, s. n.; 24071 León; Tel. +34987291146; Fax +34987291145; bufed@unileon.es ; bufed1@unileon.es ESP
Bellbergite?a new mineral with the zeolite structure type EAB
1993
The new mineral bellbergite, (K, Ba, Sr)2Sr2Ca2(Ca, Na)4Al18Si18O72 · 30H2O, has been found in Ca-rich xenoliths at the Bellberg volcano near Mayen, Eifel, Germany. It occurs as well formed bipyramids with a length up to 0.3 mm. Possible space groups are P63/mmc, P62c and P63mc with a = 13.244(1) A, c = 15.988(2) A, V = 2429 A3, Z = 1. The density is: Dm, = 2.20(2) Mg/m3, Dc = 2.19 Mg/m3. The empirical formula based on 72 oxygen atoms is: Ba0.26Na0.72K1.33Sr2.36Ca5.32Al17.55Si18.36O72 · 30H2O. The mineral is uniaxial negative with ω = 1.522(2) and e = 1.507(2) (λ = 589 nm). The strongest lines in the X-ray powder pattern are (d (A), I, hkl): 3.80 (100) (300, 212, 104), 6.58 (80) (102), 2.95…
On the Mechanism of Xylene Isomerization and its Limitations as Reaction Test for Solid Acid Catalysts
1993
The kinetics of the gas-phase isomerization of m-xylene, over a series of ultraestable Y zeolites, has been studied in a fixed-bed flow reactor under initial conditions. Using deuterated p-xylene as reactant it has been seen that more than 20% of the m- and o-xylene obtained, are formed via a bimolecular mechanism. The relative proportion of uni- to bimolecular mechanism depends on the zeolite composition. The relation between the turnover number, calculated from the kinetic rate constant for the unimolecular mechanism, and the framework Al content of the zeolite, was coincident with the topological zeolite model. Besides, the values of the adsorption constants indicate that dealumination h…
Els diners dels jueus: activitats econòmiques d'una família hebrea al món rural valencià
1993
La progresiva institucionalización del sistema antártico
1993
Las controversias sobre la soberanía antártica determinaron que el Tratado de la Antártida se celebrara con unos objetivos muy limitados. Sin embargo, el incremento de la cooperación internacional propiciado por este Tratado ha determinado que el inmenso desarrollo normativo que ha surgido del Tratado de la Antártida se haya desarrollado sobre la base de crear diversas instituciones internacionales, competentes en materias antárticas específicas, que llaman a la creación de una Secretaría Antártica permanente
Abschließende Diskussion zur Reliabilität und Validität der Schweregradbeurteilung
1993
In Ubereinstimmung mit anderen Untersuchungen (Bech et al. 1976, 1981, Maier und Philipp, 1985a, Cichetti und Prusoff, 1982, Rehm und O’Hara, 1984) belegen die vorgelegten Untersuchungen Mangel in der Reliabilitat und Validitat der gangigen Versionen der Hamilton-Depressionsskala (21-Item-Version und 17-Item-Version). Insbesondere die unzureichende interne Konstruktvaliditat belegt, das der Globalsummenscore dieser Skala in unterschiedlichen Stichproben depressiver Patienten eine unterschiedliche Bedeutung haben kann; so reprasentiert der Globalsummenscore in der Stichprobe von leichteren depressiven Syndromen vorwiegend die mit der depressiven Symptomatik assoziierte korperliche Symptomati…
Seedoil derivatives as adjuvants : influence of methyl to octadecyl oleates on the penetration of herbicides through various plant cuticles
1993
International audience
À propos d'un complot pro-bourguignon à Lyon : les révélations et les méthodes d'un cordelier espion (1423-1424)
1993
Neural Network Techniques for Metal Forming Design
1993
Neural networks are computing structures able to predict the behaviour of a system on the basis of the knowledge of facts; main characteristic of a network is the capability to find a rule in a very complex environment. In the paper a neural network, based on the results of FEM simulations, is utilized to predict the occurrence of defects in a forward extrusion metal forming process. In particular a three layers neural network, relating the operative parameters with the failure or the success of the working process, has been used and the back-propagation algorithm has been employed to train the network. Few experimental data were enough to train the neural network allowing to achieve better…