Fibre-Optic Links For A Measurement And Control System At A HV Laboratory

1990

The paper presents a fibre-optic linking system for a measurement and control system installed at an industrial HV laboratory. The indirect voltage and current measurement system is furnished with the E0/0E transducers and FO links. The exploitation requirements on the adequate measurement accuracy and reliability have necessitated the inclusion of additional, digital PO link feedback from the computer control system. The proposed measurement system with the FO link has been installed at an HV laboratory transformer of an electric power station and successfully tested together with the overall equipment.

Fiber-Optic Insulating Link In A Telecommunication System For An Electric Power Plant

1990

The paper presents a fiber-optic insulating link coupling electric power substation with a dispa-tching telecommunication center. The advantages of employing the FO link in the power plant telecommunication system include insulating properties, resistance to EMI and high transmission capacity. The technical and economical analyses are complemented with the example of an application of the link to the 110/15 kV station. The two-directional communication system provides transmission of voice, telemetry, telesignalization and remote control signals.

Fiber - Optic Loop Network With Active Nodes For An Electrical Power Plant

1990

This paper presents a fiber optic loop network for a measurement and control system of an electric power plant. The network consists of the central computer terminal, the set of specially distributed digital FO links and local station installed at the important power facilities. The well-known FO link advantages contribUte to high reliability and safety of work of the system. The operation of the loop network, treated as an autonomous one, is controlled by a microcomputer system. Transmission protocols and the cooperation with the local station are also described. The proposed loop network model is illustrated with an example of the laboratory - scale system.

Effets d'huiles sur les paramètres d'efficacité du diclofop-méthyl appliqué sur ray-grass

1990

National audience

Effet d'un mélange d'adjuvants sur les paramètres d'éfficacité du diclofop-methyl

1990

National audience

Nuclear moments and laser spectroscopy

1990

Laser spectroscopy measurements have yielded a wealth of new information about the moments and charge radii of unstable isotopes. The procedures of evaluating these moments from the magnetic dipole and electric quadrupole terms of the hyperfine structure arew discussed. Examples are presented, with emphasis on the isotopic chains of odd-proton nuclei, and their essential features are put into the context of current theoretical model descriptions for spherical and deformed nuclei. Finally, new developments of extremely sensitive experimental techniques are discussed with regard to an application to nuclei very far from stability.

Effet de basses températures sur le devenir du 2,4-D dans le Maïs

1990

National audience

First measurement of the lifetime of the charmed strange baryon Ξc0

1990

Abstract We have observed four unambiguous decays of the charmed strange baryon Ξco in the NA32 experiment at CERN. Charge- coupled devices and silicon microstrip detectors were used to reconstruct the decay mode Ξ c o → pK − K ∗ (892) o seen in events produced by the interaction of 230 GeV/c negative poins and kaons on a copper target. We present the first measurement of the lifetime of the Ξco, together with a determination of its mass and production cross section. The resonant components of the Ξco decay are studied. We use our earlier measurement of the mass of the Ξc+ in the determination of the isospin mass splitting of the Ξc states.

Multidirectional differentiation in a newly established human epithelioid sarcoma cell line (GRU-1) with co-expression of vimentin, cytokeratins and …

1990

A new permanent cell line (GRU-1) derived from the lymph-node metastasis of a human epithelioid sarcoma was established in tissue culture. Immunohistochemically, the original tumor had exhibited an intriguing potential for multidirectional differentiation with features of mesenchymal, epithelial and neural differentiation, evidenced by the co-expression of vimentin, cytokeratins and neurofilament proteins, respectively. This capability for multidirectional differentiation was fully preserved in the cultured cells. GRU-1 tumor cells proved to be uniformly positive for vimentin and a considerable proportion of the tumor cells exhibited a positive reaction for cytokeratins and neurofilament pr…

Electronic structure of phthalocyanines : Theoretical investigation of the optical properties of phthalocyanine monomers, dimers, and crystals

1990

We present valence effective Hamiltonian (VEH) calculations on the optical absorptions of a series of phthalocyanine compounds: the metal‐free phthalocyanine molecule, a model system for the lithium phthalocyanine molecule, the metal‐free phthalocyanine dimer, and model systems for the lutetium diphthalocyanine and the lithium phthalocyanine crystal. For these compounds, it is found that the major factor influencing the evolution of the optical transitions is not the electronic structure of the metal but rather the geometric structure: phthalocyanine intraring geometry and, in the dimers and crystals, interring separation and staggering angle. The origin of the so‐called Soret or B absorpti…

Low light level in vitro monitoring of cellular and antigen-antibody reactions using a photon detection camera system — New perspectives for clinical…

1990

This article briefly describes the use of a photon counting system (ARGUS-100) in the detection of low levels of light. The ARGUS-100 was used in determining ATP in cell sections from tumor tissues and in measuring a luminescence-enhanced immunoluminometric assay, using ferritin as the analyte, based on the luminol-peroxide-4-iodophenol reaction with peroxidase as the enzyme. The aim is not so much the presentation of data, but rather to show the potentials of the photon counting camera in increasing our knowledge of the cellular and subcellular levels, as well as lowering the detection limits in already sensitive systems, such as immunoassays.

The role of vagus activity in the presynaptic control of noradrenaline release from rabbit atria.

1990

Abstract On various heart preparations with the autonomic innervation left intact, vagus nerve stimulation (VNS) has been found to reduce the amount of noradrenaline (NA) that is released in response to sympathetic nerve stimulation (SNS). The following experiments were carried out on an innervated rabbit perfused atria preparation in which the overflow of NA and acetylcholine (ACh) could be determined simultaneously. VNS impulses applied at a fixed time interval before the corresponding SNS impulses reduced NA overflow when the interval was 3–10 ms (early peak) or 200–283 ms (late peak of inhibition). VNS applied 30–167 ms before SNS had no significant effect (“ineffectual period”). Both i…

Sant Gregori. Borriana, la Plana Baixa

1990

Se dan a conocer los resultados de un sondeo realizado en la villa romana de Sant Gregori (Burriana, Castelló) en el año 1987,

Tau decays to pions

1990

Semileptonic τ decays to two and three pions are considered. Based on recent data for the pion form factor a new prediction for Γ(τ→vπ-0)/Γ(τ→veve) of 1.32±0.05 is derived. The chiral model-supplemented by vector dominance-is used to predict rate and differential distributions for the three pion mode in good agreement with present data. The parity violating asymmetry which has been predicted theoretically and observed experimentally is studied and found to be fairly insensitive towards the details of the model for the hadronic decays.

La personalidad artística de Vicente Castelló y Amat

1990

LA OBRA DEL PINTOR VALENCIANO VICENTE CASTELLO Y AMAT (1787-1860), DISCIPULO DE VICENTE LOPEZ, SE ESTUDIA AQUI POR PRIMERA VEZ EN SU TOTALIDAD. ESTO PERMITE ENCUADRAR SU PERSONALIDAD MAS ALLA DE LA CONSIDERACION DE MERO SEGUIDOR DEL ACADEMICISMO LOCAL. SE ANALIZA SU PRODUCCION Y SE CONTRIBUYE A LA MISMA CON OBRAS NUEVAS. INCLUYE SU ACTIVIDAD COMO COPISTA DE PINTURAS DEL SIGLO XVII, DURANTE LOS AÑOS DE FORMACION; COMO PINTOR DE TEMAS RELIGIOSOS, DESTACANDO EL IMPORTANTE GRUPO DE FRESCOS DE LA IGLESIA DEL SALVADOR, DE VALENCIA; COMO RETRATISTA; Y FINALMENTE, COMO PINTOR DE BODEGONES, GENERO EN EL QUE SE APRECIAN INFLUENCIAS DE ARTISTAS NAPOLITANOS Y HOLANDESES DEL SIGLO XVII. (A.B.C./ L.A.G.)

Profesors Vitolds Rajevskis: biobibliogrāfiskais rādītājs

1990

Saturs: Priekšvārds. Vēstures zinātņu doktors profesors Vitolds Rajevskis. / A. Favorskis / Profesora V. Rajevska publicētie darbi (1955.-1988.). Raksti par profesoru V. Rajevski. Profesora V. Rajevska publicēto darbu alfabētiskais rādītājs. Personu rādītājs.

La prostitución valenciana en la segunda mitad del siglo XIV

1990

Flame atomic absorption analysis of gold in jewelry samples

1990

A new procedure is proposed for the determination of gold by flame atomic absorption in jewelry samples. The method is based on the acid digestion of 10 mg of sample in a microwave oven and on the on-line dilution, using a three-way valve. The dynamic range of the technique is extended to 100 mg/l gold solutions and using a weighted bracketing method for the treatment of the results, accuracy errors lower than 2% can be found in the analysis of real samples as compared with those obtained by fire assay. The method is very fast and implies only little damage to the jewelry samples.

Common antigenic determinant on ductular cells of normal pancreas, on mucosal cells of the gastrointestinal tract and on CEA

1990

CEA is widely used as a human tumour marker and was first defined by Gold and Freedman in 1965 as an antigenic component in cancers derived from gastrointestinal tract epithelium. It is a member of a large family of immunologically related glycoproteins that vary in size and tissue distribution. Studies with c-DNA clones for CEA and NCA reveal that this family consist only of a limited number of different proteins with variable glycosylation, due to post-transcriptional modifications. The complete gene family includes about 10 closely related genes. Recently it was published that in contrast to mRNA coding for CEA, mRNA coding for NCA was expressed predominantly in cancerous tissues. A mono…

Historiankirjoitus, politiikka, uskonto = Historiography, politics, religion

1990

Locust neuropeptides stimulating sex pheromone production in female European corn borer moth, Ostrinia nubilalis

1990

Abstract The presence of a pheromonotropically active hormone (PBAN-like substance) from locust organs, ( Locusta migratoria ) has been demonstrated. Extracts of brain, corpora cardiaca, corpora allata, suboesophageal ganglia and thoracic ganglia of L. migratoria caused highly pheromonotropic responses in decapitated females of the European corn borer moth ( Ostrinia nubilalis ). The highest activity per unit weight of tissue was found in the corpora cardiaca and corpora allata of the locust followed by the brain plus suboesophageal ganglion of O. nubilalis . Following 8 days of disconnection, separating the corpora allata from the corpora cardiaca and suboesophageal ganglion, the pheromono…

Quantum and Classical Statistical Mechanics of the Integrable Models in 1 + 1 Dimensions

1990

In a short but remarkable paper Yang and Yang [1] showed that the free energy of a model system consisting of N bosons on a line with repulsive δ-function interactions was given by a set of coupled integral equations. The Yangs’ chosen model is in fact the repulsive version of the quantum Nonlinear Schrodinger (NLS) model. We have shown that with appropriate extensions and different dispersion relations and phase shifts similar formulae apply to ‘all’ of the integrable models quantum or classical. These models include the sine-Gordon (s-G) and sinh-Gordon (sinh-G) models, the two NLS models (attractive and repulsive), the Landau-Lifshitz (L-L’) model which includes all four previous models,…

The reaction of 2-methoxy-3-nitrothiophene with N-benzylmethylamine in methanol

1990

The kinetics of the title reaction has been studied in methanol as a function of amine and methoxide ion concentrations. The kinetic coefficients obtained point out that the reaction is catalysed by methoxide through a SB catalysis mechanism.

Transport of dipertides through supported liquid membranes

1990

Tautas saimniecība: Latvijas PSR reģionālā politika un tās ekonomiskā nodrošinājuma plānošana

1990

Zinātniskie raksti aplūko aktuālas teorētiskas un praktiskas republikas sociālās infrastruktūras attīstības problēmas, tās plānošanas un organizēšanas apstākļos, kad palielinās republikas un tās rajonu ekonomiskā patstāvība un notiek pāreja uz saimniecisko aprēķinu.

The influence of land use on the genetic structure of populations of the common frog Rana temporaria

1990

In order to find out the influence of land use and topographic distance on the genetic structure of populations of the common frog Rana temporaria L. in the Saar-Palatinate lowlands (Federal Republic of Germany), tissue of larvae was examined by means of horizontal starch gel electrophoresis. A total of 24 loci coding for 14 different enzymes were studied. Genotype frequencies, allele frequencies and mean heterozygosity were calculated, and genetic distances using Nei's formula. Strong deviations from the Hardy-Weinberg equilibrium were found; the degree of homozygosity was higher than expected. Separation by highways reduced average heterozygosity as well as genetic polymorphism of local p…

High-performance liquid chromatography of amino acids, peptides and proteins

1990

Abstract The thermodynamic constants, associated with the interaction of three proteins with triazine dye affinity sorbents, have been derived from bath and frontal analysis experiments. In cases where mass-transfer restrictions are very high, calculation of the thermodynamic constants directly from frontal analysis experiments could not be achieved. In such cases, a portion of the adsorbate was always present in the effluent, a situation which has its effect as the split peak phenomenon. With Fractogel-based triazine dye affinity sorbents none of the test proteins applied in frontal analysis were adsorbed. A similar behaviour was observed for a Cellufine sorbent during the adsorption of hu…

Energy-energy correlations in hadronic final states from Z0 decays

1990

We have studied the energy-energy angular correlations in hadronic final states from Z0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ(5)/MS = 104-20 +25 (stat.)-20 +25(syst.)-00 +30(theor.) MeV, which corresponds to αs(91 GeV) = 0.106± 0.003 (stat.)±0.003(syst.)-0.000 +0.003(theor.). The theoretical error stems from different choices for the renormalization scale of αs. In the Monte Carlo simulation the scale of αs as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.

El descubrimiento del Dr. Ferrán la vacuna anticolérica

1990

Estudi del còlera des d'una perspectiva històrica fins a la vacuna del doctor Ferrán en l'últim terç del segle XIX. //. Estudio del cólera desde una perspectiva histórica hasta la vacuna del doctor Ferrán en el último tercio del siglo XIX.

The synthesis of metallocene-labelled drugs for biological assays

1990

Several drugs (amphetamine, desipramine, nortriptyline, phenobarbital) have been labelled with metallocenic fragments in order to develop a new immunoassay method. The metallocenic fragments are cymantrenic or benchrotrenic derivatives: the linkage between the organic and organometallic moieties has been achieved by reactions between amino and acidic functional groups. All the products (metallohaptens), purified by different chromatography techniques, have been fully characterized by IR and 1H NMR spectroscopy and their mass spectra.

Phylogenèse et biogéographie deRetinella (Lyrodiscus) Pilsbry (Gasteropoda: Zonitidae)

1990

Resume Les especes fossiles (ouest-europeennes) et actuelles (endemiques des Iles Canaries) du sous-genre Lyrodiscus (Neogene — Quaternaire) ont ete revisees sur les memes bases methodologiques. La premiere partie propose un historique de Retinella (Lyrodiscus) et des differents taxons qui lui sont apparentes. Cette revue aborde la creation de Retinella (Riediella) par Schlickum, sour-genre destine a accueillir l'espece Helix jourdani creee par Michaud . La deuxieme partie permet, sur les bases d'une analyse morphologique comparative, de reconsiderer cette attribution generique en rejetant Riedeliella et en proposant d'integrer l'espece de Michaud a Lyrodiscus. Cette confrontation a permis …

Energiehaushalt und Arbeitsphysiologie

1990

Zur Aufrechterhaltung der Korperfunktionen und der Korperstruktur ist eine standige Energiezufuhr in Form von Nahrstoffen erforderlich. Die beim Abbau der Nahrstoffe anfallende Energie kann nur teilweise in Arbeit umgesetzt werden, ein anderer Teil wird zwangslaufig — dem 2. Hauptsatz der Thermodynamik entsprechend — als Warme frei. Daruber hinaus dient die Stoffwechselenergie zur Biosynthese von Enzymen, Hormonen und zellularen Strukturelementen sowie zur Anlage von Nahrstoffdepots.

The oxygen status of arterial human blood

1990

The oxygen status of arterial human blood is described at least by four variables: Oxygen partial pressure (pO2, mmHg), oxygen saturation (sO2, %), hemoglobin content (cHb, g/dL) and oxygen content (cO2, mL/dL). Beside perfusion, however, the oxygen supply of all organs is decisively determined by the mean capillary pO2 which itself is primarily dependent on the arterial cO2. Therefore, the oxygen availability (cardiac output x caO2, mL/min) may be described by the cO2 value in arterial blood or those variables who determine the latter one. The diagnostic significance of the O2 variables of the oxygen status consequently increases in the order of pO2, sO2 (cHb) and cO2. In arterial blood, o…

Analytic solution for a class of discrete-time Riccati equations arising in Nash games

1990

Астрономия: Анализ движения небесных тел

1990

Сборник содержит научные работы по небесной механике, астрометрии и астрономическим приборам.

Didáctica de las ciencias experimentales y sociales

1990

Planteamiento de un curso de Química Orgánica basado en una clasificación funcional, ofreciendo con los hidrocarburos una gran utilidad didáctica pudiendo hacer su explicación gratificante tanto para el profesor como para el alumno. Hace una representación de la química de los hidrocarburos ya que dota al alumno del conocimento necesario en los carbonados, alifáticos y aromáticos. Su ensamblaje centra al alumno en la realidad, más instructiva que deductiva. 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