showing 36 of ~574560 from 574555 documents
Gothards Frīdrihs Stenders: 275 gadu atceres izstāde ZA Fundamentālās bibliotēkas Rokrakstu un reto grāmatu nodaļā, 1989. gada maijs-augusts: buklets
1989
Temptative Modeling of Surface Reactivity with Oxidizing-Reducing Mixtures on Rutile TiO2-δ
1989
Rutile bears some unique features in regard to oxygen transfer with the outer atmosphere, at high temperatures. It possesses very high chemical diffusivity. This diffusivity becomes apparent while performing reequilibration experiments in a final atmosphere of pure oxygen. Conversely, the oxidizing-reducing reaction with CO/CO2 mixtures at the rutile surface is always a slow process.
Accertamento sintetico e rilevanza del giudicato penale nel processo tributario
1989
La condena a presidio en Melilla: Aproximación a la criminalidad valenciana del setecientos
1989
Hacia una conceptualización del valor
1989
Hacia una conceptualización del valor
Que faire des enquêtes sur la réussite à l'université ?
1989
International audience; Ce texte propose une réflexion sur les possibilités et les limites de l'utilisation des données empiriques de plus en plus nombreuses dont on dispose aujourd'hui tant sur le passage secondaire / supérieur que sur les conditions de réussite dans le supérieur lui-même. On y recense les problèmes méthodologiques qui se posent à qui veut utiliser ces enquêtes, tout en soulignant combien il est délicat de les intégrer dans le débat politique sur l'accès à l'enseignement supérieur. L'objectif est de faire en sorte que le conseiller d'orientation puisse jouer en l'occurence un rôle d'"utilisateur averti", extrêmement précieux tant au niveau individuel qu'au niveau instituti…
The role of resonances in chiral perturbation theory
1989
32 páginas, 2 figuras, 5 tablas.-- BUTP-88-18 ; CERN-TH-5185-88 ; CPT-2158 ; UWTHPH-1988-29.
Osteocondroma Gigante del Lóbulo Adiposo de Hoffa : (a propósito de un caso)
1989
The authors present a case of osteocartilaginous metaplasia in the fat pad of the knee. They make a review of the literature and they expose the clinical and pathological findings.
Osteocondroma del Lóbulo Adiposo de la Rodilla : (a propósito de un caso)
1989
The authors communicate a case of osteochondroma located in the fat pad of the knee, treated by surgical excision. They analize its oddity, and make a review of the most interesting aspects with respect to pathogenesis and pathology.
Receptores purinérgicos en la circulación cerebral
1989
High Resolution Sorption Studies of Argon and Nitrogen on Large Crystals of Aluminophosphate AlPO4-5 AND ZEOLITE ZSM-5
1989
High resolution adsorption (HRADS) with argon and nitrogen at 77 K in the pressure range of 10−6 < p/p° < 0.5 were performed on large crystals of zeolite ZSM-5 (180 μm) and aluminophosphate AlPO4-5 (150 μm) using a novel volumetric device. Multi-step isotherms of both adsorptives on ZSM-5 could be observed for the first time. The adsorption followed by low temperature microcalorimetry resulted in distinct exothermic signals at the steps in the adsorption isotherms. Based on the results of atom-atom potential energy calculations (AAP) as well as independent model building it was shown that 24 ‘kinetic’ adsorbate molecules can be filled into a ZSM-5 unit cell. Experimental results are reasona…
The Intervention of Hydrogeophysics in the Economics of Groundwater Exploitation and Management in Sicily
1989
Abstract The problem of the preservation of water resources in Sicily presents various aspects, some of which have been treated by a number of works. Among the different applied methodologies, the geophysical ones occupy an important place. Their contribution, directed to an economic and efficient exploitation and management of groundwaters, can be useful for selected “risk” areas as well as for more regional programmes. In fact, uncontrolled drillings on relatively rich aquifers occur in several zones of this island; the economically disadvantageous exploitation causes also heavy impoverishment and pollution phenomena. The fragmentation of charges and the lack of a planning Regional Body m…
Ureterosciatic Hernia A Rare Cause of Pyonephrosis
1989
A female patient presented as an emergency case with pyonephrosis and septicemia as a result of ureterosciatic hernia. Septicemia was treated successfully by immediate percutaneous nephrostomy tubing. After complete disappearance of symptoms, the hernia was closed operatively. Topographic anatomy of ureterosciatic hernia is presented.
Ceļš: Teoloģisks rakstu krājums. 1989 (Nr.3/4; 5)
1989
Rakstu krājuma 3/4 laidienā publicēts teologa N.Plātes konfesionālais darbs - Mārtiņa Lutera "Mazā katehisma" iztirzājums. 5. laidienā lasāms: Andris Rubenis " Neoprotestantiskā ortodoksija", Arvīds Ziedonis "Pauls Tillihs, viņa dzīve un darbi".
Análisis de los métodos de monitorización de la mecánica ventilatoria, implicaciones debidas al atrapamiento intrapulmonar de gas : un estuidio sobre…
1989
A RELIABILITY MODEL FOR OPTIMAL ALLOCATION OF SPARE TOOLS IN FMS
1989
ABSTRACT A model for the dynamic management of the tool set of an FMS workstation is developed. The proposed approach processing the on-line recorded tool failure data updates the estimate of the parameters of the probability density functions of tool life and selects, at the occurence of each failure, the code of the tool to be allocated in the workstation storage devices in order to maximize its reliability over a planned horizon.
Isolation and concentration of organophosphorus pesticides from water using a c18 reversed phase
1989
Abstract A simple, rapid and effective method for the extraction and enrichment of organophosphorus pesticides based on the use of Sep-Pak C 18 cartridges was studied as alternative method to those based on extraction with organic solvents. The influence of the elution solvent, pH, salinity and volume of water filtered was studied for ten organophosphorus pesticides. The pesticides were determined by gas chromatography with a BP-1 capillary column and a thermionic detector. Recoveries at the 100 and 200 ng/1 spiking levels were greater than 85%, except for disulfoton.
Profesors Edgars Meļķisis: personālais bibliogrāfiskais rādītājs
1989
Saturs: Priekšvārds. Juridisko zinātņu doktors profesors Edgars Meļķisis. /R. Apsītis/ Juridisko zinātņu doktora profesora E. Meļķiša publicētie darbi. (1964.-1989.) Juridisko zinātņu doktora profesora E. Meļķiša rediģētie un recenzētie darbi. Raksti par juridisko zinātņu doktoru profesoru E. Meļķisi. Profesora E. Meļķiša publicēto darbu alfabētiskais rādītājs. Personu rādītājs.
Una vejez prematura
1989
Reflexión en torno a la rápida conversión en pasado de las series televisivas y su reciclaje en el propio dispositivo de la pequeña pantalla.
Papaverine in Human Bladder Muscle
1989
It is generally assumed that drugs which induce relaxation of smooth muscles may be of clinical importance in some urological disorders; such drugs are indeed widely used, for example, in the therapy of unstable bladders or to facilitate the passage of ureteral stones. Recently, papaverine has been shown to be very effective, e.g., in relaxing smooth muscles of the corpus cavernosum penis, thereby inducing erections in many impotent men (Virag 1982). The purpose of this study is to determine the relaxing properties of papaverine in isolated muscle strips from the human detrusor and to evaluate its potential clinical importance.
Cycloalkin-vinylidencycloalkan-umlagerungen
1989
Abstract Flash pyrolysis of the strained cyclic alkynes 1 leads to ring systems 2 with an exocyclic allene group and in a further isomerization step to the conjugated vinyl compounds 3 .
Fetal calf serum and retinoic acid affect proliferation and terminal differentiation of a rat rhabdomyosarcoma cell line (BA-HAN-1C)
1989
We report on the establishment of a model for differentiation induction in sarcomas, using the clonal rhabdomyosarcoma cell line BA-HAN-1C. This rhabdomyosarcoma cell line is composed of morphologically undifferentiated mononuclear stem cells, some of which spontaneously fuse to form terminally differentiated multinuclear myotube-like giant cells. The deprivation of fetal calf serum (FCS) or the exposure to retinoic acid, respectively, resulted in a significant inhibition of proliferation (P less than 0.001) and a marked increase in cellular differentiation as shown by a significant increase in the number of myotube-like giant cells (P less than 0.001) and in the creatine kinase activity (P…
Od Wydawcy
1989
Etude de l'extraction au dioxyde de carbone supercritique des composes volatils
1989
70 ref. *INRA Unite Regionale de Documentation, B.V. 1540, 21034 Dijon Cedex Diffusion du document : INRA Unite Regionale de Documentation, B.V. 1540, 21034 Dijon Cedex Diplôme : Dr. d'Université
Flush-Crash Experiments in Drosophila
1989
In 1968, Hampton Carson (1968) proposed the founder-flush-crash model, a new model of speciation, which readily lends itself to experimental testing in the laboratory (Carson 1971).
Zur Reaktion von ?Pyrazolonblau? mit Diazomethan
1989
About the Reaction of „Pyrazolone Blue” with Diazomethane The reaction of “pyrazolone blue” with diazomethane was investigated. A pyridazinone derivative 3, a heterocyclic spiro-cyclopropyl product 4 and a compound 7, which contains three pyrazolone and two diazomethane entities, are formed. 3 reacts with an excess of diazomethane to the methoxy derivative 6. The spiro-cyclopropyl compound 4 is not stable and isomerizes to the corresponding 4,4′-methylidene-bispyrazolone 5. The structures of the products were established by spectroscopic methods and X-ray analysis.
Factorial Design in the Ammonia Based Synthesis of Large Uniform MFI, MEL, DOH, and DOH/DDR Type Zeolite Crystals
1989
This study reports the synthesis of large and uniform crystals of high-silica zeolite materials. Statistic factorial design was applied in order to determine significant parameters for the rapid growth of alkali-free crystals out of ammonia-based synthesis systems. For silicalite-I, high ammonia contents at low water concentrations yielded crystals up to 300 μm in size. The number of crystal nuclei in type MFI synthesis systems was found to be significantly reduced by increasing ammonia and aluminium contents. MEL-type zeolites could be prepared only with the smaller size of 15 μm. Low water concentrations improved the product yield. Aminoadamantane as a guest molecule nucleated highly unif…
Vergleich von Duplexsonographie und CT zur Beurteilung des Tumoreinbruchs in Vena renalis und Vena cava inferior bei Nierentumoren
1989
Die praoperative Kenntnis der Tumorinvasion von Nierentumoren in Vena renalis und Vena cava inferior ist fur die Operationsstrategie von entscheidender Bedeutung.
Bibliographia medica hispanica, 1475-1950. Vol. II, Libros y folletos, 1601-1700
1989
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…
Interaction between plasma membrane H+ -ATPase and phytotoxins : use of reconstituted systems
1989
International audience
The Nonlinear σ Model
1989
The nonlinear (principal) σ model has been for a long time a theoretical laboratory to test different approaches for quantizing classical field theories. Here we shall discuss as an application of the current algebra representation theory a construction of the quantized σ model.
New structural aspects of 3-vinyl-1H-indoles for predicting the outcome of Diels-Alder reactions
1989
Some selected 3-vinyl-1H-indoles have been synthesised and the first13C-NMR studies performed; in addition He(Iα) photoelectron spectra and the results of perturbation MO calculations of some examples of this class of compounds are presented. The molecular characteristics obtained thereby can be used to predict the results of [π4s+π2s]-cycloaddition reactions with 3-vinylindoles.
Les relations entre formation et emploi en France
1989
International audience
Veränderungen des pulmonalen Gasaustausches und der Hämodynamik während Osophagusresektion — abhängig von der Operationsmethode?
1989
Sowohl die thoracoabdominelle als auch die stumpfe Osophagusresektion sind postoperativ haufig mit pulmonalen Komplikationen verbunden.
Kontinenzverhalten nach Anal- und Rektumatresie und Lebensqualität
1989
Inkontinenz, auch in partiellem Ausmas bedeutet immer eine Einschrankung der Lebensqualitat. In den verschiedenen Lebensabschnitten verandert sich die Leidensart. Beim Kleinkind steht der lokale Wundschmerz, im Schulalter die Beziehung zur Umwelt im Vordergrund. Beim Adoleszenten sind Berufsaussichten und Partnerschaftsbeziehungen eingeschrankt. Dem Kinderchirurgen kommt die Aufgabe zu, in einer subtilen Erstoperation, durch geeignete Korrekturverfahren und durch Forderung der psychologischen Entwicklung die Lebensqualitat entscheidend zu beeinflussen.
Reaction of the bone structure to methotrexate-Palacos flow y. Experimental investigations in animals.
1989
With the combined osteosynthesis of pathological fractures in association with tumors and/or metastases in mind, E. Merck (Darmstadt, FRG) developed a bone cement containing a cytostatic agent, methotrexate-Palacos flow y (MTX-Pf). The animal-experimental study presented here investigates the tolerability of MTX-Pf in the femurs of rabbits with lateral comparison. In these investigations we used both the concentration of 0.63% MTX, as is currently used in standard clinical surgery, as well as a much higher concentration of 2.5% MTX. The histological sections were investigated using microradiographic methods and provided no indication of any significant differences between the femora with th…