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  • Springer  (134)
Publikationsart
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Neutrino production of same-sign dimuons at the Fermilab Tevatron (1993)
    Springer
    The European physical journal 57 (1993), S. 1-12 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The rate of neutrino- and antineutrino-induced prompt same-sign dimuon production in steel was measured using a sample of μ−μ− events and 25 μ+μ+ events withP μ〉9 GeV/c, produced in 1.5 millionv μ and 0.3 million $$\overline {v_\mu }$$ induced charged-current events with energies between 30 GeV and 600 GeV. The data were obtained with the Chicago-Columbia-Fermilab-Rochester (CCFR) neutrino detector in the Fermilab Tevatron Quadrupole Triplet Neutrino Beam during experiments E 744 and E 770. After background subtraction, the prompt rate of same-sign dimuon production is (0.53±0.24)×10−4 perv μ charged-current event and (0.52±0.33)×10−4 per $$\overline {v_\mu }$$ charged-current event. The kinematic distributions of the same-sign dimuon events after background subtraction are consistent with those of the non-prompt background due to meson decays in the hadron shower of a charged-current event. Calculations ofc $$\bar c$$ gluon bremsstrahlung, based on improved measurements of the charm mass parameter and nucleon structure functions by the CCFR collaboration, yield a prompt rate of (0.09±0.39)×10−4 perv μ charged-current event. In this case,c $$\bar c$$ gluon bremsstrahlung is probably not an observable source of prompt same-sign dimuons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01555733
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A time-course study of chemical and physiological responses in Brassicas induced by turnip root fly (Delia floralis) larval feeding (1996)
    Springer
    Entomologia experimentalis et applicata 80 (1996), S. 221-223 
    Details
    ISSN: 1570-7458
    Schlagwort(e): induced plant response ; Cruciferae ; secondary plant metabolites ; glucosinolates ; oviposition stimuli ; semiochemicals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00194761
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Fractionally differenced models for water quality time series (1987)
    Springer
    Annals of operations research 9 (1987), S. 399-420 
    Details
    ISSN: 1572-9338
    Schlagwort(e): Time series ; fractional differencing ; long memory ; water quality ; chemical pollution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Notizen: Abstract This paper deals with the selection and evaluation of statistical techniques for use in the modeling and forecasting of water quality time series. The focus is on statistical concepts relevant to the analysis of flows and concentrations. A selection of time series procedures has been used for auditing water quality archival data, including the screening of data sets, correlation and spectrum calculations, and iterative model fitting. A summary is provided of experience with analyzing archival data on the Niagara River and the use of a fractionally differenced model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02054746
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Coking and regeneration of palladium-doped H3PW12O40/SiO2 catalysts (2000)
    Springer
    Catalysis letters 66 (2000), S. 53-57 
    Details
    ISSN: 1572-879X
    Schlagwort(e): heteropoly acid ; palladium modification ; propene oligomerisation ; coke formation ; catalyst regeneration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The coking during propene oligomerisation and subsequent regeneration of both silica-supported heteropoly acid H3PW12O40 (PW) and its palladium-modified form (1.6–2.5 wt% Pd) have been studied. 31P MAS NMR studies have revealed that the Keggin structure of the catalyst was unaffected by coke deposition in both unmodified PW/SiO2 and Pd-modified form. As shown by 13C MAS NMR and TGA/TPO, the Pd modification affects the nature of the coke formed: for the standard catalyst (PW/SiO2) both soft coke, comprising mainly high molecular weight aliphatic oligomers, and hard coke, comprising polynuclear aromatics, are formed whilst on the Pd-modified catalyst only the soft coke is observed. Coke formation causes strong deactivation of the catalyst in the oligomerisation of propene. The aerobic burning of coke on the unmodified PW/SiO2 occurs in the temperature range of 470–520°C. Doping the catalyst with Pd significantly decreases this temperature to allow catalyst regeneration at temperatures as low as 350°C without loss of catalytic activity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019083103395
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Colohepatic fistula due to hydatid disease (1983)
    Springer
    World journal of surgery 7 (1983), S. 797-798 
    Details
    ISSN: 1432-2323
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé La fistulisation d'un kyste hydatique dans le colon n'a pas été décrite jusqu'à maintenant alors que la rupture du parasite géant dans la cavité péritonéale dans l'artère biliaire ou dans le poumon par l'intermédiaire du diaphragme est bien connue. Dans le cas rapporté le lavement baryté a montré à posteriori, après l'intervention une image plaidant en faveur d'une fistule colo-hépatique qui fut méconnue (fig 2). La présence d'une grande quantité de gaz dans la cavité kystique suggère son origine colique plutôt que sa formation in situ du fait de l'infection. L'extériorisation du colon après suture de la brèche colique a été jugée plus adéquate que la colostomie d'amont et que la réintégration immédiate de l'anse colique dans la cavité abdominale en raison des risques de contamination septique. Cette attitude se solda par un bon résultat. Si le traitement du kyste hydatique par les moyens médicaux est susceptible d'entrainer la guérison dans le futur, la chirurgie restera indispensable pour toutes les complications: fistule, infection, obstruction biliaire et rupture.
    Kurzfassung: Resumen Se informa el caso de un paciente originario de Yemen, pero residente en el Reino Unido durante 30 años, quien se presentó con un cuadro febril (38.5°C), hígado doloroso y aumentado de tamaño y una gran cavidad con nivel aero-líquido en el cuadrante superior del abdomen, la cual probó ser un quiste hidático del lóbulo derecho del hígado. El quiste fue aspirado, inyectado con nitrato de plata al 5% y luego abierto para extraer los quistes filiales y las membranas germinativas, después de lo cual se presentó fistulización al colon que requirió exteriorización del segmento afectado. Aun cuando el tratamiento primario de la enfermedad hidatídica pronto habrá de ser médico, la cirugía todavía será requerida para complicaciones tales como fístula, infección, obstrucción biliar o ruptura.
    Notizen: Abstract Communication of a hepatic hydatid cyst to the colon appears to be extremely rare. We report a 54-year-old male who underwent surgery for a huge hydatid cyst. Four days after the cyst was aspirated and many daughter cysts were removed, gross fecal contamination occurred as a result of a 0.5-cm defect in the right transverse colon. The defect was repaired and the colon temporarily exteriorized. Recovery was uneventful.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01655224
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Induction of brain tumours in high yield by administration of N-ethyl-N-nitrosourea to newborn rats (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1452-1453 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Zusammenfassung Durch einmalige Verabreichung von 10 mg/kg N-Äthyl-N-Nitrosoharnstoff am 1. Tag nach der Geburt wurden bei 33/34 Ratten 53 Hirntumoren, 9 Tumoren des Rückenmarkes, aber nur 9 im peripheren Nervensystem erzeugt, was eine bedeutend gesteigerte Rate von Hirntumoren bedeutet.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01957845
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Factorization inK[X 2,X 3] (1993)
    Springer
    Archiv der Mathematik 61 (1993), S. 521-528 
    Details
    ISSN: 1420-8938
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01196590
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    The transcendental meditation technique, adrenocortical activity, and implications for stress (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 618-619 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The practice of the transcendental meditation technique in subjects eliciting this state regularly for 3–5 years is correlated with acute decline of adrenocortical activity not associated with sleep during the practice.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01936994
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Altered thiol status in patients with rheumatoid arthritis (1982)
    Springer
    Rheumatology international 2 (1982), S. 107-111 
    Details
    ISSN: 1437-160X
    Schlagwort(e): Thiol ; Rheumatoid arthritis ; Sulphydryl ; Thiol reactivity ; Glutathione
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The thiol status of patients with rheumatoid arthritis is significantly different from that of controls. Plasma thiol levels are lower, albumin thiol reactivity is altered and intracellular thiol levels measured after hemoglobin precipitation are increased. These variations correlate with other indices of disease severity and are one measure of a disturbance in the degree of oxidation of the blood. Penicillamine, in common with other effective therapeutic agents, produces an increase in serum thiol concentration. It causes a greater effect on serum thiol reactivity than other drugs and in particular it increases ‘fast reacting’ thiol levels without significantly altering the ‘slow reacting’ thiol level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00541162
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Influence of leaf size, orientation, and arrangement on temperature and transpiration in three high-elevation, large-leafed herbs (1982)
    Springer
    Oecologia 53 (1982), S. 227-234 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The temperature and water relations of the largleafed, high-elevation species Frasera speciosa, Balsamorhiza sagittata, and Rumex densiflorus were evaluated in the Medicine Bow Mountains of southeast Wyoming (USA) to determine the influence of leaf size, orientation, and arrangement on transpiration. These species characteristically have low minimum stomatal resistances (〈60 s m-1) and high maximum transpiration rates (〉260 mg m-2s-1 for F. speciosa). Field measurements of leaf and microclimatic parameters were incorporated into a computer simulation using standard energy balance equations which predicted leaf temperature (T leaf) and transpiration for various leaf sizes. Whole-plant transpiration during a day was simulated using field measurements for plants with natural leaf sizes and compared to transpiration rates simulated for plants having identical, but hypothetically smaller (0.5 cm) leaves during a clear day and a typically cloudy day. Although clear-day transpiration for F. speciosa plants with natural size leaves was only 2.0% less per unit leaf area than that predicted for plants with much smaller leaves, daily transpiration of B. sagittata and R. densiflorus plants with natural leaf sizes was 16.1% and 21.1% less, respectively. The predicted influence of a larger leaf size on transpiration for the cloudy day was similar to clear-day results except that F. speciosa had much greater decreases in transpiration (12.7%). The different influences of leaf size on transpiration between the three species was primarily due to major differences in leaf absorptance to solar radiation, orientation, and arrangement which caused large differences in T leaf. Also, simulated increases in leaf size above natural sizes measured in the field resulted in only small additional decreases in predicted transpiration, indicating a leaf size that was nearly optimal for reducing transpiration. These results are discussed in terms of the possible evolution of a larger leaf size in combination with specific leaf absorptances, orientations and arrangements which could act to reduce transpiration for species growing in short-season habitats where the requirement for rapid carbon fixation might necessitate low stomatal resistances.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00545668
    Standort Signatur Einschränkungen Verfügbarkeit
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