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  • 1
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 19 (1933), S. 1-25 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Im Anschluß an eigene Versuche wird ein kurzer kritischer Überblick über den gegenwärtigen Stand der mitogenetischen Forschung von der Detektorseite aus gegeben. Es werden die wichtigsten biologischen und physikalischen Nachweismethoden in bezug auf ihre Brauchbarkeit und Zuverlässigkeit untersucht. Bei der Zwiebelmethode muß aus neuen Versuchen Moissejewas geschlossen werden, daß die Zwiebelwurzel nicht als Detektor für die Gurwitsch-Strahlung dienen kann. Auch die Sprossungsintensität von Hefezellen kommt wegen ihrer Schwankungsbreite in der bisher geübten Art und Weise nicht als Meßinstrument für mitogenetische Strahlen in Frage. Bei Methoden, die auf einer direkten oder indirekten Bestimmung der Generationsdauer von Protisten basieren, muß zur Erlangung einwandfreier Ergebnisse ebenfalls die normale Schwankungsbreite berücksichtigt werden. Da dies bisher nicht in genügendem Maße bzw. überhaupt nicht getan wurde, muß die Richtigkeit der auf diesem Wege erhaltenen Ergebnisse bezweifelt werden. Auch mit anderen biologischen und physikalischen Methoden (Seeigeleier, Gewebekulturen, photographische Platte, Liesegangsche Ringe, lichtelektrische Erscheinungen) erhaltene Ergebnisse, die sich auf die Strahlennatur des mitogenetischen Reizfaktors beziehen, müssen teils als widerlegt, teils als in keiner Weise gesichert gelten. Es werden allgemeine Richtlienien für künftige mitogenetische Versuche aufgestellt und die Forderung erhoben, daß statt Zusammentragung weiterer nicht beweisbarer Einzelheiten zunächst die Fundamente der gesamten mitogenetischen Forschung besser und einwandfreier gesichert werden müssen. Solange dies nicht geschehen ist, liegt keine Berechtigung vor, die Gurwitsch-Strahlung als Tatsache hinzustellen.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The suitability of standard grass as bioaccumulator for different elements was investigated theoretically as well as experimentally using INAA and XRFA. The calculation is based on the annual mean values of elemental mass concentration in air at three sites with various characteristics and on the published data for deposition velocity. The potential contaminations computed in this way and supported by our experimental results were compared with the average mass contents in the standard grass. The resulting “degrees of potential contamination” show that for elements as Cr, Fe, Hg, Pb and Sb the monitoring with standard grass is normally possible, while for other elements (e.g. Br, Ca, Co, K, Mn, Na, Ni, S, Zn) the separation of contamination by film stripping method is indispensable. There is also an intermediate group (As, Ba, Se).
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  • 5
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Environmental monitoring requires reliable and effective analytical techniques for widely different concentration ranges. Two such methods (INAA and XRFA) were applied in a comparative environmental study on air dust filters and grass. The samples were collected during one year at two locations (near Bucharest/Romania and near Stuttgart/Germany) with different levels of air pollution. Seventeen environmentally relevant elements (As, Ba, Br, Ca, Co, Cr, Cu, Fe, K, Mn, Ni, Pb, S, Sb, Se, V, Zn) were determined. The aim was to test the suitability of INAA and XRFA methods for different elements in these kinds of samplesaat realistical pollution levels. The results were statistically compared for 13 elements, which were determined by both analytical techniques. They were also used to characterize the air pollution level and its variation at the two locations, and to compare them. Generally, concentrations in air of the elements studied are higher in Bucharest than in Stuttgart.
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  • 6
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results of calculations of all tree-level Standard Model diagrams for the reaction $$e^ + e^ - \to e^ + e^ - b\bar b$$ in the energy range of LEPII and the Nexte + e − Linear Collider are presented. The complete matrix element was calculated by means of the software package CompHEP; phase space integration and event generation were carried out with the computer programs BASES/SPRING with additional regularizations necessary in order to handle singularities. The contributions of the dominating subsets of diagrams, the possible interference terms and their with results of previous calculations as well as with those derived from simple analytical approximations is demonstrated. Encouraging results are obtained regarding the extraction of the Higgs signal from the overwhelming background.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We examine the prospects for measuring the $H Z \gamma$ coupling of a standard model-like Higgs boson with a mass between 120 and 160 GeV at the future TESLA linear e + e - collider, assuming an integrated luminosity of 1 ab-1 and a center-of-mass energy of 500 GeV. We consider the Higgs boson produced in association with $\nu_e \bar{\nu_e}$ via the W W fusion reaction $e^+e^- \rightarrow \nu_e \bar{\nu_e} H$ , followed by the rare decay into a Z boson and a photon, $H \rightarrow Z \gamma$ . Accounting for all main background contributions, a precision of 27% can be achieved in unpolarized e + e - collisions for M H = 140 GeV. With appropriate initial state polarisations $\Delta$ BF( $H \rightarrow Z \gamma$ )/BF( $H \rightarrow Z \gamma$ ), or the precisions on the $H \rightarrow Z \gamma$ partial width, can be improved to 17% and provide valuable information on the $H Z \gamma$ coupling. For M H = 120 and 160 GeV, the small significance of the signals in unpolarized collisions sets upper limits of 79% respectively 72% at 90% confidence level on the $H \rightarrow Z \gamma$ branching fraction.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1435-3725
    Keywords: not given
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Assuming an integrated luminosity of 500 fb−1 and a center-of-mass energy of 350 GeV, we examine the prospects for measuring branching fractions of a Standard Model-like Higgs boson with a mass of 160 GeV at the future linear e+e−collider TESLA when the Higgs boson is produced via the Higgsstrahlung mechanism, e+e− → HZ. The Higgs boson mass chosen close to the W pair threshold covers a mass regime with complicated background structures. We study in detail including some detector responds the precisions achievable for the branching fractions of the Higgs boson into WW(*), ZZ* and $$b{\bar b}$$ , whereas the measurement of BF(H → γ γ) remains a great challenge. Expectations for the total Higgs width are discussed using either the BF(Z → ZZ*) measurement of this study and the expected error for the inclusive Higgsstrahlung cross section or in addition the precise cross section expected for the weak boson fusion process, e+e− → v $${\bar v}$$ H, or W,Z-universality.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 58 (1929), S. 619-650 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Bei der Röntgenemissionsanalyse mit Kathodenstrahlenanregnng, die hinsichtlich ihrer Fehlerquellen untersucht wird, werden chemische Umsetzungen auf der Antikathode festgestellt. Eine neue Analysenmethode wird ausgebildet und geprüft, bei welcher Temperatureffekte nicht möglich sind. Die neue „Fluoreszenzmethode“ gestattet also ohne weiteres, leichtflüchtige Stoffe und auch Losungen zu untersuchen.
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  • 10
    ISSN: 1434-6036
    Keywords: 79.20.Kz ; 61.46.+w ; 61.16.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The crystal and electronic structure of solidC 76 has been studied using transmission electron microscopy and electron energy-loss spectroscopy in transmission. C76 forms a close packed structure with an average facecentred cubic symmetry. From valence band and core electron excitations information on the dielectric function and the unoccupied density of states has been obtained.
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