showing 36 of ~574560 from 574555 documents
Mechanism of the Ne-22 (d, Li-6) O-18 reaction
1984
As part of a systematic study, the (d,Li6) reaction has been measured at a bombarding energy of 80 MeV on Ne22. Angular distributions were obtained in an angular range of 8° to 35° (lab). In the framework of finite-range distorted-wave Born approximation calculations, alpha spectroscopic factors were extracted. The strong collectivity of the low-lying states suggests the necessity of employing a coupled reaction channels formalism in the analysis. Indeed spectroscopic information arising from one-channel distorted-wave Born approximation calculations reveals significant differences between experimental and theoretical results. Furthermore, the shapes of some experimental angular distributio…
Charge-Induced Deformation of the 4He Solid-Superfluid Interface
1984
The interface between solid and superfluid 4He has revealed unusual dynamic properties. Characteristic of this quantum system are the very high thermal conductivity of the superfluid phase, and an extremely small heat of fusion below temperatures of about 1 K. As a result, equilibrium at the solid-superfluid 4He interface is established quite rapidly, which gives rise, e.g., to melting — crystallization waves [1,2] — similar in appearance to surface waves on a free liquid surface — and to anomalous transmission of sound [3].
Towards a Neofunctionalist Theory of Psychology?
1984
The contemporary study of human activity comprises various levels of description. Three levels are distinguished for the purpose of the present paper: (1) single acts and interaction episodes; (2) individual activity structures; (3) life process. Regardless of the level of analysis the theoretical models correspond to each other. Activity is examined in relation to goals and conditions which include both situational and environmental inputs. It is suggested that different types of explanations are fruitful for each aspect of activity, but they do not exclude each other. The action-oriented approach represents a continuation to the functionalist tradition while emphasizing intentional activi…
Synthesis, characterization and a voltammetric study of (Bu4N)2[Mo2Br6]. Oxidation-reduction mechanism of related compounds
1984
The synthesis and characterization of (Bu4N)2[Mo2Br6], obtained from Mo(CO)6, (Bu4N)Br and 1,2-dibromoethane, is described. The electrochemical behaviour of [Mo2Br6]−2 and related species is studied, and an oxidation-reduction mechanism is proposed.
Evidence for Impaired Hepatic Vitamin K1 Metabolism in Patients Treated with N-Methyl-Thiotetrazole Cephalosporins
1984
SummaryIn 8 patients on no oral intake and with parenteral alimentation, administration of cephalosporins with N-methyl-thiotetrazole side chain (moxalactam, cefamandole), was associated with prolongation of prothrombin time, appearance in the circulation of descarboxy-prothrombin (counter immunoelectrophoresis and echis carinatus assay) and diminution of protein C. Acute administration of 10 mg vitamin Ki was followed by the transient appearance of vitamin K1 2,3-epoxide, indicating an impaired hepatocellular regeneration of vitamin K1 from the epoxide. Impaired hepatic vitamin K1 metabolism, tentatively ascribed to the N-methyl-thiotetrazole group, is one (but possibly not the only) cause…
Cancellation, pumping and permutation in formal languages
1984
La obra científica del astrónomo Fausto Vallés y Vega, Barón de la Puebla
1984
Una nueva inscripción latina de Bejís
1984
Las primeras noticias sobre la epigrafía latina de Bejís aparecen publicadas por F. Diago en 1613, quién cita dos inscripciones conservadas entonces 'en la granja que llaman Mas de Alcaydón'. Posteriormente, estas dos inscripciones serán recogidas por numerosos autores, como A. Ponz, hijo ilustre de Bejís. También a fines del siglo XVIII, P. de Saboya y Valcárcel -cuyo trabajo no será publicado hasta 1852- incorpora a este breve inven· tario una nueva inscripción fragmentada.
La Cova Negra de Xátiva y el musteriense de la región central del Mediterráneo español
1984
Esta publicación constituye la Tesis Doctoral del autor presentada en la Facultad de Geografía e Historia de la Universidad de Valencia en 1983.
The Influence of Brassinosteroid, a Growth-promoting Steroidal Lactone, on Development and CO2-fixation Capacity of Intact Wheat and Mustard Seedlings
1984
In 1970, Mitchell et al. isolated a lipoidal complex from the pollen of rape (Brassica napus L.). This complex, called “Brassins” was found to have partly powerful growth-promoting properties. The novel growth response of young bean plants in the second internode assay (Worley, Mitchell 1971; Mitchell, Gregory 1972) and other physiological changes following Brassin-treatment have been studied under several aspects (Krizek, Worley 1981; Gregory 1981).
La administración real y los antecedentes históricos de la audiencia moderna
1984
The Problem of the Transfer of the Results of Research and Innovations into the Sector Of Energy Conservation
1984
The manifold and different “barriers” that must be overcome to let the innovations deriving from research become widely known by users and operators alike, are being made the object of consideration all over the industrialized world and by the European Community itself.
Frequency-Analysis of Precursors of Cytotoxic T Lymphocytes in Radiation Chimeras: Enumeration of Antigenspecific CTL-P Restricted to Thymic MHC- and…
1984
The mechanisms controlling the acquisition of T cell restriction specificity and immunocompetence are, despite of numerous investigations, not well understood. From studies of the CTL-immune responsiveness in thymus- and bone marrow-grafted chimeric mice, it became apparent, that it is the thymus which is crucial not only for the maturation or T cells, but also for the specificity repertoire of the T cells (1,2). From these data it was suggested, that during intra-thymic maturation both mutational events and positive selection mechanisms influence the repertoire such that only T cells restricted to thymic epithelial cell MHC determinants mature and will be exported to the peripheral lymphoi…
Volumen y procedencia de la moneda romana del 313 al 318 d.C. en el territorio Valenciano
1984
Sprachlenkung oder Sprachpflege? Zur Situation der germanistischen Sprachpflege heute
1984
SUMMARY Directing a Language or Cultivating It? On German Language Cultivation Today The cultivation of the German language outside Germany is, as is well known, the task of the Goethe Institute. But how is German cultivated at home, that is, within the German-language area? Indeed, is there any need to cultivate a language internally, "intralingually"? And if so, how can language cultivation be organized? In Germany there is no institution corresponding to the Académie française. Finally we may ask the basic question as to the meaning of "language cultivation." What is it? Cultivation of the German language within the large, self-contained community of people whose native language it is? T…
Racemische Histamin-H1-Agonisten
1984
Es wurden racemische α- und β-methylverzweigte 2-(2-Aminoethyl)-thiazole und 2-(2-Aminoethyl)-imidazole (Isohistamine) dargestellt und auf Histamin-H1- und -H2-agonistische Aktivitat gepruft. Histamine Analogues, XXVI: Racemic Histamine H1-Agonists Racemic α or β-methylated 2-(2-aminoethyl)thiazoles and 2-(2-aminoethyl)imidazoles (isohistamines) were prepared and tested for histamine H1- and H2-agonistic activity.
Charakterystyka produktów polimeryzacji etylenu otrzymanych wobec metaloorganicznych katalizatorów Ti-Al zawierających ligandy izopropoksylowe
1984
Uretero-Sigmoideostomie im Kindesalter — klinische, psychische und soziale Aspekte
1984
Zwischen 1967 und 1983 wurde an der Urologischen Klinik Mainz bei 40 Patienten mit Blasenekstrophie bzw. Epispadie die Uretero-Sigmoidostomie durchgefuhrt. Das Verhaltnis mannlicher zu weiblichen Patienten war 3:1.
The rheological behaviour of HDPE/LDPE blends. II. Die swell and normal stresses
1984
Die swell data are presented for different high-density/low-density polyethylene blends. The data relating to samples with frozen-in stresses are represented, collected as a function of the usual operational parameters (L/D ratio, flow rate, temperature). Data obtained with annealed samples are used to derive, through a theoretical approach, normal stresses. Die Strahlaufweitung wurde fur verschiedene Mischungen aus Polyethylenen hoher und niedriger Dichte gemessen. Die an Proben mit eingefrorenen Spannungen erhaltenen Werte wurden in Abhangigkeit von technologischen Parametern (Lange/Durchmesser-Verhaltnis, Fliesgeschwindigkeit, Temperatur) dargestellt. An getemperten Proben gemessene Wert…
Contributo alla conoscenza della flora somala
1984
Nell'ambito di ricerche sulla flora dell'Africa orientale è stata accertata la presenza di alcune specie nuove per il territorio somalo. Nel presente contributo vengono segnalate nel distretto di Mogadiscio tre graminacee, rinvenute in habitat sinantropici. Si tratta in particolare di Perotis hildebrandtii Mez e Cenchrus setigerus Vahl, nuove per l'intero territorio somalo, e di Aristida protensa Henrard, sinora nota in una singola stazione della Somalia nord-orientale.
Muon Knight shift at a structural defect in zinc crystals
1984
The interaction of a light hydrogen isotope with a structural defect is traced for the first time by means of the temperature dependence of the muon Knight shiftKμ in the hcp metal Zn. A surprising result is the huge and negativeKμ (−520 ppm) at the defect site, probably a multivacancy cluster.
The glucose-dependent transport of L-malate in Zygosaccharomyces bailii.
1984
Zygosaccharomyces bailii possesses a constitutive malic enzyme, but only small amounts of malate are decomposed when the cells ferment fructose. Cells growing anaerobically on glucose (glucose cells) decompose malate, whereas fructose cells do not. Only glucose cells show an increase in the intracellular concentration of malate when suspended in a malate-containing solution. The transport system for malate is induced by glucose, but it is repressed by fructose. The synthesis of this transport system is inhibited by cycloheximide. Of the two enantiomers L-malate is transported preferentially. The transport of malate by induced cells is not only inhibited by addition of fructose but also inac…
Crystal and molecular structures of hexaaquazinc(II)isonicotinate n-oxide and catena-diaquabis-μ-(isonicotinato n-oxide)cadmium(II)
1984
Abstract [Zn(H2O)6](N-inicO)2 is an ionic compound made up of hexaaqua metal cations and isonicotinate N-oxide anions. It forms an isomorphic series with the corresponding Mg2+, Fe2+, Co2+ and Ni2+ compounds. In [Cd(N-inicO)2(H2O)2]n complex, coordination takes place through the NO oxygen and one of the (COO) oxygens with ligand forming thus a double bridge between Cd2+ ions. The structure is an endless chain stretching diagonally through the unit cell. The coordination polyhedron in both compounds is almost undistorted octahedron.
Niveles sociolingüísticos de Sagunto : análisis de las inferencias morfosintácticas en la comunidad de habla de Sagunto (Valencia)
1984
MICROPROCESSOR-BASED SUBOPTIMAL CONTROL OF CONVERTER-FED HYPO-HYPERSYNCHRONOUS CASCADE DRIVES
1984
This work consists ofi a theoretic and experimental study o£ a possible practical realization oi a micro pro cess or-based control system using a converter-fad hypo-hypersynchronous cascade. drive. Vlrstly, the design o£ a microprocessor-based controller Is carried out considering an approximate mathematical model, linear-type, o& the drive -In question, by using optimal control techniques. Several physical constraints, -buck as -input variables constraints, state variables constraints and processing time. o& microprocessor are taken -into account. The approach followed attorn us to obtain a suboptimal, closed-loop control system. In addition, In order to carry out a more accurate study ofa…
Polymeric Monolayers and Liposomes as Models for Biomembranes and Cells
1984
Conventional model membrane systems based on natural lipids usually lack long term stability. Polymer chemistry can help to overcome this disadvantage introducing polymerizable lipids into these systems. Polymerizable lipids used are diacetylenes, butadienes, acrylates or lipids which can undergo polycondensation.
Il contributo dell'epidemiologia analitica alla conoscenza della patologia da esposizione alle radiofrequenze (RF) e microonde (MO)
1984
Thermotropic polyesters with mesogenic groups based on substituted hydroquinone units and highly flexible siloxan spacer in the main chain
1984
New thermotropic Polyesters having mesogenic groups based on substituted hydroquinone units and highly flexible oligosiloxan spacer in the main chain, are synthesized and characterized. The mesophase formed at low temperature are studied by differential scanning calorimetry (DSC) and polarized light microscopy. The liquid crystalline behaviour of these polyesters, particulary their transition temperatures and the mesophase width could be explained on the basis of their structural features.
Microelectrode Measurements of Oxygen Tension Distributions in Multicellular Spheroids Cultured in Spinner Flasks
1984
Since multicellular spheroids were introduced into cancer research by Sutherland et al. (1970, 1971), they have been widely used for studying the susceptibility of cancer cells to various treatment modalities. Many of these investigations provided evidence for a major role of oxygen in controlling the metabolic and cell cycle state of the tumor cells, thus modifying the responsiveness of the cells to therapy. Several investigators have measured O2 tension (PO2) distributions in spheroids with O2-sensitive microelectrodes (Carlsson et al. 1979; Kaufman et al. 1981; Mueller-Klieser and Sutherland 1982a, b, 1983; Mueller-Klieser et al. 1983). The measurements produced PO2 values that varied co…
A Singular Multi-Grid Iteration Method for Bifurcation Problems
1984
We propose an efficient technique for the numerical computation of bifurcating branches of solutions of large sparse systems of nonlinear, parameter-dependent equations. The algorithm consists of a nested iteration procedure employing a multi-grid method for singular problems. The basic iteration scheme is related to the Lyapounov-Schmidt method and is widely used for proving the existence of bifurcating solutions. We present numerical examples which confirm the efficiency of the algorithm.
Совершенствование методов борьбы с преступностью
1984
Narratividad clásica y poética de la modernidad
1984
El presente artículo analiza la figura poética del 'correlato objetivo' a partir de un western clásico norteamericano: Shane (Raíces profundas, George Stevns, 1953). Poniendo en relación de contraste la narrativa hollowoodiense y la retórica de la modernidad, el texto subraya las fisuras poéticas que pueden hallarse en un relato canónicamente clásico.
La signification de Bibracte dans la cité des Éduens
1984
Guillaumet Jean-Paul. La signification de Bibracte dans la cité des Éduens. In: Archéologie et rapports sociaux en Gaule : Protohistoire et Antiquité. Table ronde de CNRS de Besançon, mai 1982. Besançon : Université de Franche-Comté, 1984. pp. 69-76. (Annales littéraires de l'Université de Besançon, 290)
Nierenfunktionsuntersuchungen mit der Sequenz-CT
1984
Die CT hat sich als hervorragendes Diagnostikum zur Darstellung der Morphologie bewahrt, eine Verfeinerung der computertomographischen Diagnostik kann noch durch die Kontrastmittelinjektion in Bolusform erreicht werden.