showing 36 of ~574560 from 574555 documents
The cost-effectiveness of distance teaching for school equivalency
1984
International audience
The inhibition and control of aggression
1984
Archivo de arte valenciano, 1984, año 65
1984
Revista editada por Real Academia de Bellas Artes de San Carlos
Telemática: ¿Espejismo o Revolución?
1984
Intervención de José Vidal-Beneyto en el "I Simposio Nuevas Tecnologías en la Vida Cultural Española", celebrado en el Palacio de Congresos y Exposiciones de Madrid, del 11 al 13 de junio de 1984 (organizado por el Ministerio de Cultura, dirigido por Román Gubern y coordinado por César Alonso de los Ríos).
Crónica de Juan Arias (Simposio Bolonia: 29 noviembre 1984 - 3 diciembre 1984)
1984
Son notas de José Vidal-Beneyto en las que se basa la reseña de Juan Arias publicada en "El País" el 19 de diciembre de 1984 sobre el simposio "Prensa y Opinión Pública" (Bolonia, diciembre 1984), presidido por José Vidal-Beneyto.
Finlance : the Finnish journal of language learning and language teaching 1984, Vol. III
1984
Contents Green, Peter S.: Reliability in the assessment of written communicative skills, pp. 1-24 Takala, Sauli: Some perspectives on criterion-referenced measurement, pp. 25-54 Süßmilch, Edgar: Sprachleistungsmessung mittels C-Tests, pp. 55-93 Esser, Ulrich: Psychologische Aspekte der Diagnose von Fremdsprachenlernfähigkeiten – Eine Diagnose der Diagnostik, pp. 95-104 Marton, Waldemar: The contrastive analysis hypothesis and the contemporary acquisitional paradigm: a comparison with some pedagogical implications, pp. 105-113 Vanderplank, Robert N.: Seven problems of evaluation in a university language centre, pp. 115-123 Korpimies, Liisa: Zur Einschätzung des Fremdsprachenunterrichts an S…
On the validity of Friedrichs’ inequalities
1984
A standard proof of Friedrich's second inequality is based on contradiction argumentation. In this paper a direct proof is presented. Moreover, necessary and sufficient conditions for the validity of Friedrichs' first and second inequality are given for plane domains. peerReviewed
Intervenciones de José Vidal-Beneyto sobre El libro en la cultura de los años 80
1984
Comunicación: Reflexión y Praxis
1984
Se trata del texto de la intervención de José Vidal Beneyto en el "Seminario Internacional de Comunicación y Cultura", organizado por el Instituto Superior de Comunicación y Diseño de Chile, celebrado del 23 al 27 de abril de 1984 en Santiago de Chile. Se incluye el programa del congreso.
España y la OTAN
1984
Finite element approximation for a div-rot system with mixed boundary conditions in non-smooth plane domains
1984
The authors examine a finite element method for the numerical approximation of the solution to a div-rot system with mixed boundary conditions in bounded plane domains with piecewise smooth boundary. The solvability of the system both in an infinite and finite dimensional formulation is proved. Piecewise linear element fields with pointwise boundary conditions are used and their approximation properties are studied. Numerical examples indicating the accuracy of the method are given. peerReviewed
Adenosine activates a potassium conductance in guinea-pig atrial heart muscle.
1983
Adenosine shortens the action potential and diminishes the force of contraction in guinea-pig left atria. These effects may be brought about by the activation of a potassium conductance. This assumption is supported by voltage clamp and 42K release experiments.
Increased activities of prolyl 4-hydroxylase and galactosylhydroxylysyl glucosyltransferase, enzymes of collagen biosynthesis, in skeletal muscle of …
1983
The activities of prolyl 4-hydroxylase (PH) and galactosylhydroxylysyl glucosyltransferase (GGT), and the concentration of 4-hydroxyproline were measured in red and white parts of quadriceps femoris muscle of mice after 3, 10, and 20 sessions of daily endurance training. The activities of PH and GGT increased in the red part of the muscle after training for 3 and 10 times and returned to the control level after 20 training sessions. In the white muscle the increase of PH activity was less than in the red muscle. No alteration in GGT activity was observed in the white muscle. The concentration of hydroxyproline was unchanged in the both types of skeletal muscle. The results suggest that coll…
Post-post-Newtonian effects on a clean nearly-Newtonian binary
1983
Etude du taux de changement temporel moyen de l'energie newtonienne et du moment d'une binaire presque newtonienne, ponctuelle. On trouve qu'il faut ajouter quelques termes post-post newtoniens non seculaires aux flux radiatifs seculaires standards. Les termes post-post newtoniens tendent vers zero pour l'observateur du centre de masse newtonien dans le cas de l'energie mais pas dans le cas du moment. Du fait de la longue periode de ces termes ils sont observationnellement significatifs, c'est-a-dire qu'ils vont apparaitre comme s'ils etaient des effets seculaires
Effect of training on aerobic capacity of female athletes differing in muscle fibre composition
1983
Abstract The effects of endurance training were studied in two groups of female cross‐country skiers who differed in muscle fibre composition. The ST‐group (n = 10) had 56–76% slow twitch (ST) muscle fibres and the FT‐group (n= 10) 40–55% ST fibres in the m. vastus lateralis. During a four‐month period, the subjects trained on the average 81 km per week. The intensive training (heart rate 0–15 beats per min below maximum) averaged 8.5 km per week. The differences in training between the two groups were not significant. The ST‐group significantly increased their cycling maximum oxygen uptake (C max, 4.6%, P <0.01) and the anaerobic threshold (AT, 2.8%, P <0.01) during the training period whe…
�ber den Satz von Kegel und Wielandt
1983
Unendliche Gruppen mit einem lokalen System aus endlichen Ree-Gruppen vom Typ2G2
1983
Infradian rhythms of serotonin and serotonin‐N‐acetyltransferase in the pineal gland of male rats
1983
Abstract The present investigation was carried out to determine whether in the pineal gland of male Sprague‐Dawley rats infradian rhythms with respect to serotonin, serotonin‐N‐acetyltransferase (NAT) activity, and hydroxyindole‐O‐methyltransferase (HIOMT) can be detected. The serotonin data obtained over a period of 4 weeks and subjected to power spectral analysis suggest the presence of infradian rhythms in the range of 6 and 4.3 days. NAT activity, obtained over a period of 28 days, revealed a 7‐day‐rhythm. A second peak occurring at 2.3 days remained just below the significance limit. HIOMT activity studied over a period of 8 days showed no statistically significant differences between …
false
1983
Resultats preliminaires sur les polysiloxanes discotiques avec des cycles triphenylene pentasubstitue fixes au squelette par des liaisons flexibles
Relationship between radial and concentric cracking of tomato fruit
1983
Abstract A study with 62 genotypes was carried out to establish correlations existing between the percentages of fruits showing concentric cracks of more or less than 2 cm and radial cracks of more or less than 2 cm, considering both early and total production. Over a determined productive period, the susceptibility to form large or small cracks was controlled by the same genetic system (rG = 0.89 – 0.95), yet there was a genetic difference between susceptibility to radial and concentric cracking (rG = 0.53 – 0.68). Genetic systems for susceptibility to radial and concentric cracking seemed to show similarly over the first harvesting and over the total productive period ( r G ⋍ 1 ). Environ…
La production de diplômés à l'Université
1983
référence interne : 83040
The electromagnetic mass difference of pions from asymptotic QCD
1983
We show how the asymptotic behaviour of an analytic amplitude can yield information on the amplitude at small space-like momenta. Applying this to QCD two-point functions, we are able to obtain low energy parameters without using resonance saturation. In the special case considered here, we have calculated the electromagnetic mass difference of pions using only the asymptotic QCD amplitude. The result, in very good agreement with experiment is\(\Delta m_\pi = 5.3 \pm 1.5MeV.\)
Interaction of uridine with GABA binding sites in cerebellar membranes of the rat
1983
The effect of uridine, a postulated anticonvulsant agent, on GABA receptors has been investigated. Uridine inhibits [3H]GABA binding to rat cerebellar buffer-washed membranes. Pretreatment of the membranes with Triton X-100 increases the effect of uridine on GABA-binding. The Scatchard analysis reveals that both high and low affinities of GABA for its receptors are affected by 1 mM uridine, while the apparent number of binding sites remains unchanged. The ability of uridine to interact competitively with GABA binding sites, also examined by the Lineweaver-Burk analysis, suggests a possible mechanism of action of this anticonvulsant agent, so including it among those compounds characterized …
Le syndrome du diplôme et le chômage des jeunes diplômés, le cas de la Haute-Volta
1983
Référence interne : 83046
External ballistic of volcanic explosions
1983
In order to determine the kinetic energy of an explosion it is necessary to know the initial velocities of ejected fragments. Calculations of initial velocities made earlier with few exceptions did not take into account the resistance of the air and therefore, greatly underestimated the initial velocities, and consequently the energy of the explosions. A solution of the inverse problem of ballistics which takes into account air resistance makes it possible to find precise values of initial velocities of ejection, determined from the distance of ejected fragments and their ballistic coefficients. The method makes it possible to determine the kinetic energy of explosions for eruptions which w…
Synthesis of complement by macrophages and modulation of their functions through complement activation.
1983
During the last decade considerable progress has been made to characterize intimate functional links between macrophages, a major cellular component of immunoinflammatory responses, and the complement system representing the major humoral mediator of inflammation. Macrophages of various species and tissue sites have been shown to synthesize and release most of the complement components providing these cells with their own \ldpericellular\rd complement system. Circumstantial evidence for the assembly of both classical and alternative pathway convertases has been adduced. An intricate network of feedback loops involving endogenous and extrinsic factors operates to adjust complement production…
false
1983
The viscosity of solutions of poly(decyl methacrylate)s, PDMA, in 1-pentanol (thermodynamically poor solvent) and in toluence or isooctane (good solvents) was measured up to shear rates of 3 · 104s−1 by means of rotational viscosimeters. The observed pronounced shear thinning is for all solutions well described by the theory of Graessley, with the extension, introduced by Ito. Two parameters, resulting from the evaluation of the flow curves on the basis of the above theory, are discussed: τ0, a characteristic relaxation time of the polymer chain, is found to be in the range of ms. ηfric, a frictional parameter, independent of shear rate, amounts upto 50% of the zero-shear viscosity for the …
Nuclear moments and charge radii of rare-earth isotopes studied by collinear fast-beam laser spectroscopy
1983
The collinear fast-beam laser technique is being used to measure systematically hyperfine structures and isotope shifts of unstable nuclides in the rare-earth region. This brief report gives a general survey of the results obtained for the even-Z elements64Gd,66Dy,68Er and70Yb, with emphasis on the nuclear spins and moments. They allow a rather complete mapping of the single-particle structure and the development of nuclear deformation in the N > 82 region. The spins, magnetic moments and spectroscopic quadrupole moments of159–169Yb are presented in detail.
On-line high-pressure extraction-high-performance liquid chromatography
1983
Abstract A coupling unit is described that allows on-line operation of a high-pressure extraction apparatus with a high-performance liquid chromatograph. The unit consists of two high-pressure sample-injection valves, connected in series. The first valve operates as a switching valve to the loop and controls the release of pressure along a packed microbore column. Two short, packed microbore columns are positioned between the first and second valve, sampling the extracted compounds over a desired period and simultaneously operating as sample loop for the second valve; the latter is the injector for the high-performance liquid chromatographic column. The unit was tested by continuous extract…
Seasonal-variation of nitrogenous compounds in the xylem sap of citrus
1983
Samples of tracheal sap of Citrus sinensis (L.) Osbeck cv. Washington Navel were taken from field trees throughout the year and the nitrogen composition of the sap was determined. The nitrogenous fraction of the sap was composed mainly of free amino acids (92–97% of total nitrogen) and nitrates throughout the year. Proline was the most abundant amino acid during almost the entire cycle, and its concentration was especially high during the autumn and winter period. Nevertheless, a significant part (40–60%) of the total organic nitrogen was transported as arginine. Total nitrogen as well as amino acids and nitrates were maximal at spring flush. At spring flush and summer flush there was also …
Kommentar zum Beitrag von I. Klempa et al. Transplantathyperparathyreoidismus ?Tumor�hnliches Wachstum und autonome Funktion menschlicher Autotranspl…
1983
On the behaviour of measures of noncompactness with respect to differentiation and integration of vector-valued functions
1983
Inherited pericentric inversion of human chromosome 5.
1983
Une inversion pericentrique heterozygote du chromosome 5 a ete decouverte dans les cellules de la moelle osseuse et dans les lymphocytes peripheriques stimules par le phytohemagglutinine d'une femme de 75 ans atteinte de myelofibrose et de metaplasie myeloide. L'inversion etait presente dans 100% des metaphases etudiees. Les points de cessure du chromosome 5 etaient localises en k15 et q10. Une etude de la famille est presentee
Neourethra: a new two-stage procedure for reconstruction of the functional urethra.
1983
Abstract In 14 male dogs, the functional urethra was replaced by a bladder flap tube in a 2-stage procedure. In the 1st stage of the operation a bipedicle strip from the anterior bladder wall was tubularized around a 10F or 12F catheter. After 10 to 12 weeks the 2nd stage of the procedure was performed: the bladder neck was transected and sutured, and the cranial pedicle of the bipedicle tube was transected and pulled through the bluntly dissected pelvic floor muscles. From the distal end of the tube a perineal urostoma was created to facilitate radiological and urodynamic followup. Eight dogs completed a followup 5 months after the 2nd procedure. Urodynamic and x-ray studies were done preo…
New sunphotometer for network operation.
1983
A handheld sunphotometer has been developed and is described. It operates for 9 wavelengths in the visible and near infrared. The sensitivity range is rather broad, so it can be used in turbid as well as clear atmospheres. The operation is simple, and a digital readout helps prevent operator biases. The instrument is sun powered and suitable for network operations. Determination of the atmospheric turbidity due to aerosol and the column content of O3, NO2, H2O is possible.
false
1983
Poly(ethylene glycol)s grated onto suitably functionalized, crosslinked polystyrenes were introduced as a new class of multidetachably immobilized hydrophilic macromolecular supports for the synthesis of peptides. This new polymeric carrier system facilitates both the homogeneous solvation of the reaction site and the insolubilization of the substrate, which are prerequisites for an efficient multistep synthesis using polymeric supports. In these support systems, a strongly solvated hydrophilic linear chain molecule, poly(ethylene glycol) (PEG)1 , is attached to an insoluble, crosslinked polystyrene through suitable anchoring linkages. At the free chain end of this supported PEG, amino acid…