showing 36 of ~574560 from 574555 documents
Graphical Models for Dependencies and Associations
1992
The role of graphical representations is described in distinguishing various special forms of independency structure that can arise with multivariate data, especially in observational studies in the social sciences. Conventions for constructing the graphs and strategies for analysing three sets of data are summarized. Finally some directions for desirable future work are outlined.
Akseli Gallen-Kallela ja Serlachiukset : Akseli Gallen-Kallelan yhteistyö G. A. Serlachiuksen ja Gösta Serlachiuksen kanssa
1992
High-Resolution Photoacoustic Raman-Spectroscopy of Gases
1992
0377-0486; A high-resolution photoacoustic Raman spectroscopy experiment is described. The resolution achieved by using two single-mode pulsed lasers is about 0.0054 cm-1 (full width at half maximum intensity). The experiment was tested first on the v1/2v2 bands of CO2 and gave an increase of at least about one order of magnitude in the signal-to-noise ratio with respect to stimulated Raman spectroscopy at low pressure (ca. 10 Torr almost-equal-to 13 kPa). The sensitivity is also demonstrated by the study of the weak hot band v1 + v2 - v2 of CO2. In both cases, the experimental line shape is well reproduced by taking into account Doppler and collisional effects. A comparison with CARS spect…
Éléments pour une typologie des séquences de texte technique
1992
Rapport de contrat; Nous nous intéressons ici à l'activité de lecture dans un cadre particulier. Cette activité est essentiellement cognitive. Nous tentons d'appréhender le phénomène de la mise en relief tant au moment de la production de texte qu'à celui de la représentation que le lecteur se construit de ce qui est dit par le texte. Dans le cadre de ce compte rendu nous nous limiterons volontairement à l'aspect typologie textuelle le versant expérimental de notre recherche sera abordé ultérieurement dès lors que les bases de notre travail seront bien établies.
Evolution of black grouse leks: female preferences benefit males in larger leks
1992
El corsé de Milwaukee en la escoliosis idiopática: resultados en el plano sagital
1992
Se presentan los resultados obtenidos en el tratamiento de la escoliosis idiopática con el cors é de Milwauke e en el plano sagital. Han sido estudiado s 51 paciente s (44 mujere s y 7 varones) con una edad medi a al inicio del tratamient o de 13 años. El tipo de curva según la clasificación de King y Moe corresponde a 18 del tipo I, 16 del tipo II, 12 del III, 1 del IV, 2 del V y dos curvas lumbares. El seguimiento medio de la serie fue de 5 años. El 88% de los pacientes (45 casos) mostró una disminución del valor angular medio de la cifosis torácica. El promedio de disminución fue de 10° que representa el 32% del valor angular inicial. El 86% (44 pacientes) mostró aplanamiento de la lordo…
Osteocondroma intra-raquideo con afectación neurológica
1992
Se presenta el caso de un varón de 16 años con lumbalgia consecutiva a traumatismo vertebral, sin hallazgo s radiológicos, que no mejoraba con tratamient o conservador, y que a las 5 semanas desarrolló un cuadro de paraparesia e incontinencia de esfínteres indicativo de afectación del cono medular. En el estudio mielográfico se objetivó bloqueo completo a nivel de Ll. La tomografía axial mostró una imagen sugestiva de osteocondroma intraraquídeo, que s e confirmó quirúrgicamente . Dos año s tras la intervención, se logró la total recuperación neurológica. Se destaca la rareza de la lesión, la dificultad diagnóstica, y la probable etiología traumática de la tumoración. A 16-year-old man with…
La Junta de Contrafurs: uns inicis conflictius
1992
Matter Transport and Corrosion Kinetics of Metals and Alloys at High Temperature
1992
Evaluation of the interelemental effect in X-ray fluorescence analysis by the total addition method
1992
An algorithm for quantifying interelemental effects in X-ray fluorescence techniques is developed. By applying an addition process, the ratio between the mass absorption coefficients of the analyte and the unknown sample (μi*/μs*) is calculated to correct the fluorescence intensity of the element to be determined and linearize the I-c calibration plot. This coefficient can be calculated graphically and numerically. The method is applied to the determination of tin in lead alloys with good results over wide concentration ranges.
Biochemical Factors and Mechanisms of Secondary Brain Damage in Cerebral Ischemia and Trauma
1992
A distinction between primary and secondary manifestations of brain damage from acute insults, such as trauma, or ischemia is not only of scientific interest but also of the highest clinical significance. After all, prevention of secondary brain damage in patients with severe head injury or cerebral ischemia is the ultimate purpose of treatment, including the measures of emergency care. It can be assumed that the secondary sequelae of head injury are as important for the outcome as the primary insult is. Therefore, it is obvious that development of more effective forms of treatment requires a better understanding of the mechanisms underlying secondary brain damage. Manifestations of seconda…
Crystal and molecular structure of tris(mepirizole) copper(II) hexafluorophosphate [mepirizole = 4-methoxy-2-5-methoxy-3-methyl-1h-pyrazol-1-yl)-6-me…
1992
Abstract The X-ray crystal structure of Cu(mep)3(PF6)2 [mep = mepirizole or 4-methoxy-2-(5-methoxy-3-methyl-1H-pyrazol-1-yl)-6 methylpyrimidine], obtained from stoichiometric quantities of mep, Cu(NO3)2 and KPF6 in water/ethanol solution was determined. The trisbidentate Cu(mep)32+ cation is observed for the first time. One of the three mep molecules is disordered over two sets of positions related by crystallographic symmetry. The mep molecules exhibit two different conformations A and B: conformation B, which is observed for the first time, derives from the usual conformation A by rotating the pyrimidine ring by 180° around the central CN bond and rotating by 180° the methoxy group bonde…
Effects of 1-(halogenalkoxy)alkyl-5-fluorouracil derivatives on cell growth, cell volume and nucleus size of mouse lymphoma cells.
1992
The effects of three 1-(halogenalkoxy)alkyl-5-fluorouracil derivatives on cultured mouse lymphoma cells were studied and compared with those of N-methyl-bis-(2-chloroethyl)amine hydrochloride (Lost). The derivatives exert only little influence on cell proliferation and cell volume. However, all derivatives cause a concentration-dependent nucleus contraction, probably due to DNA cross-linkings. Bromodesoxyuridine modulates the effects of the derivatives on the DNA, leading to swelling of the nucleus, which may be caused by DNA strand-breaks. It is suggested that the derivatives exert synergistic effects with other factors. It is concluded that these studies are suitable for the prescreening …
Purification of a fetal bovine serum factor that inhibits DNA synthesis in chick embryo retinas
1992
Thermomechanical Phenomena in Extended Thermodynamics of an Ideal Monoatomic Superfluid
1992
Voltammetric behaviour of monomeric fac-trioxomolybdenum(VI) complexes with aminocarboxylic ligands in aqueous media
1992
Abstract Cyclic voltammetry, polarography and controlled-potential coulometry experiments have been used to characterize the electrochemical reduction of fac-MoO3L2− complexes (L = aspartic acid or iminodiacetic acid) in aqueous media. These complexes are reduced in two irreversible proton-assisted steps to give an oxo-bridged molybdenum(V) species and then to a molybdenum(III) dimer species. At pH 4.5, the former reduction step for the iminodiacetic acid ligand occurs at Ep = −0.75 V, while the second one appears at −1.12 V vs SCE. The overall electrochemical process can be described in terms of a homogeneous chemical reaction, coupled between two electron transfers (ECE mechanism), that i…
The Appendix as a Continence Mechanism
1992
Although we have progressed very well in creating large capacity, low pressure reservoirs, the construction of a simple and reliable continent outlet still remains a problem. The appendix vermiformis serves well as a continence mechanism for either the bladder or intestinal reservoirs for urine. The different surgical techniques described in the literature are reviewed and discussed in this context. Moreover, we report on our clinical and experimental results of using the appendix during the Mainz pouch procedure for continent urinary diversion.
Espectro de las formas biológicas de Raunkier en las dunas de Guardamar del Segura y Elche
1992
Se comenta la distribución respecto de la distancia al mar de las 12 formas biológicas (terófitos escaposos, geófitos bulbosos y rizomatosos, hemicriptófitos cespitosos, reptantesy escaposos, caméfitos fruticosos, subfruticosos y suculentos, nanofanerófitos, fanerófitos y lianas) reconocidas en las dunas de Guardamar del Segura y Elche agrupadas en 7 tipos básicos (terófitos, geófitos, hemicriptófitos, caméfitos nanofanerófitos, fanerófitos y lianas). El distinto comportamiento de las formas biológicas en relación a la variable estudiada, se explica preferentemente por el efecto antrópico sobre el área de estudio que por la variación propia de los sistemas dunares, como corrobora el hecho d…
Least-Norm Regularization For Weak Two-Level Optimization Problems
1992
In this paper, we consider a regularization for weak two-level optimization problems by adaptation of the method presented by Solohovic (1970). Existence and approximation results are given in the case in which the constraints to the lower level problems are described by a multifunction. Convergence results for the least-norm regularization under perturbations are also presented.
Centre-périphérie: un modèle efficace pour l'espace comtois
1992
Le modèle ne présente ici que le fonctionnement interne du réseau urbain régional. De ce fait. les attractions de métropoles extérieures et l'aire d'influence large de Besançon-capitale ne sont pas exprimées ; elles le seront dans le document suivant.
L'"uxoricide féminin" au 18e siècle
1992
L’enseignement du droit en Europe. Préface
1992
International audience; Résumé à venir
Marginalist analysis of Ricardian division and reasoning
1992
Pour mener à bien l' étude nous organiserons notre travail autour des trois thèmes suivants:I. La rente ricardienne et la répartition.II. La rente est-elle compatible avec l'hypothèse de la concurrence pure et l'équilibre général?III. On ne peut pas établir une analogie entre la théorie marginaliste de la répartition et la rente ricardienne
Polarization Effects in Electromagnetic Deuteron Break-Up
1992
Polarization observables of deuteron photo- and electrodisintegration with polarized photons and electrons, respectively, and oriented deuterons are investigated with respect to their sensitivity to subnuclear degrees of freedom and relativistic effects, to the different electric and magnetic multipole contributions, to various realistic potential models and — in electrodisintegration — to e.m. form factors.
Search for a very light CP-odd neutral Higgs boson of the MSSM
1992
Abstract The reactions e + e − → hZ ∗ and e + e − → hA have been used to search for the neutral Higgs bosons h and A of the MSSM in the case where the CP -odd A is lighter than 2 m μ , taking into account the large h → AA decay branching ratio. No signal was found in the data sample collected until the end of 1991 by the ALEPH experiment at LEP. For tan β ⩾, m A m μ is excluded at 95% CL for any m h .
Las sansimonianas: un grupo feminista paradigmático
1992
Se trata de un estudio sobre el feminismo dentro del movimiento utópico del sansimonismo. Mientras el positivismo comtiano daba a las mujeres un papel complementario al del varón y cantaba las excelencias femeninas de forma interesada, el sansimonismo fue una de las filosofías sociales del XIX que introdujo la idea de la incorporación de la mujeres a la construcción de la nueva sociedad de manera que se defendía la igualdad de las mujeres. Se analizan diferentes aspectos del misticismo y utopismo que defendía la doctrina sansimoniana: En espera de la Mujer-Mesías; la idea de que el individuo social es la pareja; se analizan las propuestas de las sansimonianas más relevantes como Clara Bazar…
El Maghreb: crecimiento demográfico, empleo y emigración
1992
En aras de un mayor aprovechamiento docente de la investigación, sería deseable que los geógrafos españoles ahondasen en el estudio de otras regiones. Para nosotros la importancia del Maghreb está fuera de toda duda: proximidad geográfica, flujos migratorios, etc. Desde el momento de su independencia política, esta región norteafricana ha conocido un extraordinario crecimiento demográfico, que continua en el momento actual, como resultado de la progresiva reducción de la mortalidad y del mantenimiento de una elevada fecundidad. Las diferencias entre los países del área obedecen al rol de la mujer, fuertemente condicionado por las políticas gubernamentales etc...
Cromatografía líquida de alta resolución con detector de fila de diodos en la estimación de diuréticos en muestras de orina : análisis de screening y…
1992
Nuclei Far from Stability and the R-Process Waiting-Point Concept
1992
The nucleosynthesis process by rapid neutron captures (the r-process) is responsible for the formation of about half of the nuclear species in nature beyond Fe. While the astrophysical site for the r-process is not yet unambiguously identified, its association with the cores of low-mass stars undergoing type II supernova (SN) events is strongly suggested (see, e.g., Refs.1,2).
Pico: A data acquisition program for picosecond laser spectroscopy
1992
Abstract A data acquisition and control program for picosecond pump and probe experiments has been developed. The program PICO is written in C-programming language for maximum efficiency. The software which runs on an IBM PC compatible microcomputer controls a stepper motor driven optical delay, and at the same time collects data from a digital lock-in amplifier. PICO can be used to control any experiment utilizing two-beam pump probe technique. The modular structure of the software allows for easy implementation with different hardware configurations. The program includes: measurement option, manual control of the delay line using a joystick and functions for file retrieval and editing. Ad…
Therapeutic synergism between hyaluronic acid and dexamethasone in the intra-articular treatment of osteoarthritis of the knee: a preliminary open st…
1992
In vitro studies on the effects of dexamethasone on human synovial cells have shown that with high concentrations of the steroid in the culture medium cellular activity was completely blocked whereas with low concentrations (10(-6)M), cellular density decreased but there was an increase in the synthesis of RNA, DNA, protein and hyaluronic acid. These data, coupled with clinical experience of using intra-articular hyaluronic acid to treat patients with osteoarthritis of the knee, prompted the investigators to carry out an open, randomized study of the use of very small doses of dexamethasone in association with hyaluronic acid in 40 osteoarthritic patients. Twenty patients received a weekly …
Simulación de movimientos articulares de la columna vertebral mediante ordenador
1992
Pinturas murales romanas procedentes del Grau Vell (Sagunto, Valencia)
1992
El presupuesto de la Universidad de Valencia (1598-1611)
1992
EL ANALISIS DEL PRESUPUESTO EN LOS PRIMEROS AÑOS DEL REINADO DE FELIPE III PRESENTA EL ASPECTO FINANCIERO DE LA UNIVERSIDAD QUE PERDURARA HASTA EL SIGLO XVIII, ES DECIR, DOTACION MUNICIPAL Y DE FONDOS DE PAVORDIA. LA PRIMERA SE MOSTRARA, POR LO GENERAL, ESCASA, Y LOS PROFESORES DEBERAN BUSCAR COMPLEMENTAR SUS INGRESOS. LA RENTA DE PAVORDIA SERA MAS SUSTANCIOSA Y PRIVILEGIARA LAS MATERIAS TEOLOGICAS DE ACUERDO CON LOS NUEVOS TIEMPOS DEL BARROCO CUANDO DICHA DISCIPLINA SE CONVIERTE EN COLUMNA VERTEBRAL A LA QUE SE SUBORDINAN LOS DEMAS SABERES CIENTIFICO-TECNICOS. LA DOTACION PRESUPUESTARIA ES, PUES, HASTA CIENTO PUNTO, INDICATIVA DE LA IMPORTANCIA SOCIO-CULTURAL QUE TIENEN LAS DISTINTAS MATER…
[3.3]Metacyclophane mit anti ‐Konformation
1992
[3.3]Metacyclophanes with anti Conformation The [3.3]metacyclophanes 5 and 9 with prevailing anti conformation were prepared by using different cyclisation techniques. 1H-NMR studies and X-ray structure analyses of both phanes 5 and 9 prove their unprecedented conformations.