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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 3793-3795 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 72 (1950), S. 2122-2124 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 63 (1994), S. 25-61 
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 50 (1985), S. 4432-4439 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3875-3876 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physiology 40 (1978), S. 279-306 
    ISSN: 0066-4278
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Biology
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Pseudotachylitische Brekzien, entweder an schicht-parallelen oder normalen Verwerfungen, kommen häufig im nördlichen und nordwestlichen Teil des Gold- und Uranreichen Witwatersrand Beckens in Südafrika vor. Man hat sie hauptsächlich von einem tangentialen Bereich um den Vredefort Dom beschrieben. Der Dom ist der tieferodierte Rest der zentralen Aufwölbung der Vredefort Impaktstruktur, die ursprünglich linen Durchmesser von mindestens 250 Km hatte. Einige dieser Verwerfungszonen wurden entlang von Traversen beprobt, die Verwerfungsbrekzien sowie deren Nebengesteine beinhalteten, und geochemisch mit dem Ziel untersucht, die Prozesse bei der Brekzien-Bildung und die zeitlichen Verhältnisse von Verwerfungen und regionalgeologischen Ereignissen zu erfassen. Petrographische Analysen zeigten, daß die Verwerfungszonen im Zusammenhang mit der Brekzierungsphase stark hydrothermal überprägt wurden (ein Prozess, der daher als Autometasomatose bezeichnet wird) und eine zweite Überprägungsphase erfahren haben, die nach der Brekzierung stattfand. Es wird gezeigt, daß sowohl Mischung von wenigstens zwei Mutter-Gesteinskomponenten und Flüssigkeitsüberprägung, die Verwerfungszonen und Nebengesteine betraf, wichtige Rollen in der Bestimmung der chemischen Charakteristiken der untersuchten Zonen spielten. Viele Elemente, darunter Gold und Uran, wurden durch diese Prozesse lokal mobilisiert und wieder abgelagert. Diese Verwerfungszonen, von denen einige eine beckenweite Bedeutung besitzen, agierten als wichtige Kanäle für Flüssigkeiten, die die Verbreitung von wichtigen Metallen im Witwatersrand Becken modifizieren konnten. Da unsere Untersuchungsorte weit voneinander getrennt liegen, muß angenommen werden, daß diese Prozesse wenigstens weite Teile des Beckens beeinflußten. Da jedoch die chemischen Charakteristika der untersuchten Zonen von Fall zu Fall unterschiedlich sind, liegt die Vermutung nahe, daß Metalle höchstens lokal mobilisiert und umgelagert wurden und daß dies vermutlich im wesentlichen in der Nähe von existierenden Reefs stattfand. Es ist ferner klar, daß die Umlagerung von Metallen auf die unmittelbaren Bereiche dieser Verwerfungszonen beschränkt war.
    Notes: Summary Pseudotachylitic breccias, associated with either bedding-parallel or normal faults, are abundant in the northern and northwestern parts of the gold- and uranium-rich Witwatersrand Basin in South Africa. They are particularly abundant in a zone tangential to the Vredefort Dome, a structure which is now widely accepted to be the eroded remnant of the central uplift of the originally 250 to 300 km wide Vredefort impact structure. Several of these fault zones were sampled along vertical traverses that included both fault breccias and host rocks. Geochemical analyses were undertaken to investigate the processes involved in fault rock formation. In addition, the temporal relationships of fault activity to regional geological events was studied. Detailed petrographic analysis shows evidence for strong hydrothermal overprints of the faults related to breccia formation (thus termed ‘autometasomatism’), as well as post-formational alteration. Mixing between two or more precursor lithologies and fluid alteration affected both the fault zones and their wall-rocks. A wide spectrum of trace elements, including Au and U, has been locally mobilised and redeposited by these processes. These fault zones, some of which are of basin-wide significance, were important channels for fluids that also modified the distribution of base metals in the Witwatersrand Basin. The regionally separated locations of our study areas suggest that these processes affected at least a major part of the basin. However, as the chemical characteristics determined for the fault zones differ from site to site, it is likely that the metals were only locally remobilised in the vicinity of fault zones or to previously hydrothermally altered country rock. Subsequent redeposition of metals was limited to the regimes in and around such fault zones.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 178-180 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We describe here a third method of defibrination which avoids frothing or a marked rise in pH. When the method was extended for 60 min at room temperature no haemolysis occurred, which suggests that there is less cell damage than with the other two methods. The three methods are compared, ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Boundary layer meteorology 27 (1983), S. 163-169 
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Recent papers by Wilson et al. (1981b) and Legg and Raupach (1982) give methods for the calculation of particle trajectories in turbulence with a gradient in vertical velocity variance Σ 2 w. However the two methods seem contradictory. This paper demonstrates that in systems in which l(dΣ w /dz) (where / is the length scale) varies only slowly with height z, the two methods give similar predictions, and indicates why this is the case. For a particular system in which the restriction on l(dΣ w /dz) is not satisfied, it is shown that neither method is correct but that a simple modification of the method of Wilson et al. (1981b) gives reasonable predictions.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This paper considers the ground area which affects the properties of fluid parcels observed at a given spot in the Planetary Boundary Layer (PBL). We examine two source-area functions; the “footprint,” giving the source area for a measurement of vertical flux: and the distribution of “contact distance”, the distance since a particle observed aloft last made contact with the surface. We explain why the distribution of contact distance extends vastly farther upwind than the footprint, and suggest for the extent of the footprint the inequalities: % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqaqpepeea0xe9qqVa0l% b9peea0lb9Lq-JfrVkFHe9peea0dXdarVe0Fb9pgea0xa9W8qr0-vr% 0-viWZqaceaabiGaciaacaqabeaadaqaaqaaaOabaeqabaGaamyvam% aalaaabaGaamiAaaqaaiabeo8aZnaaBaaaleaacaWGxbaabeaakiaa% cIcacaWGObGaaiykaaaacqGH8aapcaWG4bGaeyipaWJaamyvaKazaa% iadaGabaqaamaaDaaajqwaacqaaiaadIgacaGGVaGabmOEayaacaGa% aiilaiaabccacaGGVbGaaiiDaiaacIgacaGGLbGaaiOCaiaacEhaca% GGPbGaai4CaiaacwgaaeaacaWGubWaaSbaaKazcaiabaGaamitaaqa% baqcKfaGaiaacIcacaWGObGaaiykaiaabYcacaqGGaGaaeiAaiaabc% cacaGGHbGaaiOyaiaac+gacaGG2bGaaiyzaiaabccacaGGZbGaaiyD% aiaackhacaGGMbGaaiyyaiaacogacaGGLbGaeyOeI0IaaiiBaiaacg% gacaGG5bGaaiyzaiaackhaaaaajqgaacGaay5EaaaakeaaaeaacaGG% 8bGaamyEaiaacYhacqGH8aapcqaHdpWCdaWgaaWcbaGaamODaaqaba% GccaGGOaGaamiAaiaacMcadaWcaaqaaiaadIhaaeaacaWGvbaaaaaa% aa!7877!\[\begin{array}{l} U\frac{h}{{\sigma _W (h)}} 〈 x 〈 U\left\{ {_{h/\dot z,{\rm{ }}otherwise}^{T_L (h){\rm{, h }}above{\rm{ }}surface - layer} } \right. \\ \\ |y| 〈 \sigma _v (h)\frac{x}{U} \\ \end{array}\] where U is the mean streamwise (x) velocity, h is the observation height, ΤL is the Lagrangian timescale, Σ v and Σ w are the standard deviations of the cross-stream horizontal (y) and vertical (z) velocity fluctuations, and ż is the Lagrangian Similarity prediction for the rate of rise of the centre of gravity of a puff released at ground. Simple analytical solutions for the contact-time and the footprint are derived, by treating the PBL as consisting of two sub-layers. The contact-time solutions agree very well with the predictions of a Lagrangian stochastic model, which we adopt in the absence of measurements as our best estimate of reality, but the footprint solution offers no improvement over the above inequality.
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