992 resultados para 48-406
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The behavior of bottomonium state correlators at non-zero temperature, 140.4(β = 6.664) ≤ T ≤ 221(β = 7.280) (MeV), where the transition temperature is 154(9) (MeV), is studied, using lattice NRQCD on 48³ ×12 HotQCD HiSQ action configurations with light dynamical Nf = 2+1 (mu,s/ms = 0.05) staggered quarks. In order to understand finite temperature effects on quarkonium states, zero temperature behavior of bottomonium correlators is compared based on 32⁴ (β = 6.664,6.800 and 6.950) and 48³ ×64 (β = 7.280) lattices. We find that temperature effects on S-wave bottomoniumstates are small but P-wave bottomoniumstates show a noticeable temperature dependence above the transition temperature.
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The 146Sm–142Nd system plays a central role in tracing the silicate differentiation of the Earth prior to 4.1 Ga. After this time, given its initial abundance, the 146Sm can be considered to be extinct. Upadhyay et al. (2009) reported unexpected negative 142Nd anomalies in 1.48 Ga rocks of the Khariar nepheline syenite complex (India) and inferred that an early enriched, low-Sm/Nd reservoir must have contributed to the mantle source rocks of the Khariar complex. As 146Sm had been effectively extinct for about 2.6 billion years before the crystallisation of the Khariar samples, this Nd signature should have remained isolated from the convective mantle for at least that long. It was thus suggested that the source rock of Khariar samples had been sequestered in the lithospheric root of the Indian craton. Using a different chemical separation method, and a different Thermal Ionization Mass Spectrometry (TIMS) analysis protocol, the present study attempted to replicate these negative 142Nd anomalies, but none were found. To determine which data set is correct, we investigated three possible sources of bias between them: imperfect cancellation of Faraday collector efficiencies during multidynamic TIMS analysis, rapid sample fractionation between the sequential measurement of 146Nd/144Nd and 142Nd/144Nd, and non-exponential law behaviour resulting from so-called “domain mixing.” Incomplete cancellation of collector efficiencies was found unlikely to cause resolvable biases at the estimated level of variation among collector efficiencies. Even in the case of highly variable efficiency and resolvable biases, there is no reason to suspect that they would reproducibly affect only four rocks out of 10 analysed by Upadhyay et al. (2009). Although domain mixing may explain apparent “reverse” fractionation trends observed in some TIMS analyses, it cannot be the cause of the apparent negative anomalies in the study of Upadhyay et al. (2009). It was determined that rapid mass fractionation during the course of a multidynamic TIMS analysis can bias all measured Nd ratios. After applying an approximate correction for this effect, only one rock from Upadhyay et al. (2009) retained an apparent negative 142Nd anomaly. This, in conjunction with our new, anomaly-free data set measured at fractionation rates too low to cause bias, leads to the conclusion that the anomalies reported by Upadhyay et al. (2009) are a subtle and reproducible analytical artefact. The absence of negative 142Nd anomalies in these rocks relaxes the need for a mechanism (other than crust formation) that can isolate a Nd reservoir from the convective mantle for billions of years.
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Vorbesitzer: Isaak Markus Jost
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Vorbesitzer: Bartholomaeusstift Frankfurt am Main
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Vorbesitzer: Ratsbibliothek Frankfurt am Main
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Welsch (Projektbearbeiter): Einladung an die Wahlglieder der Berliner Wahlbezirke 42 bis 45 und 48 zur Vorberatung über die Ausübung des Urwählerrechts für die erste Kammer
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Welsch (Projektbearbeiter): Aufruf von 7 unterzeichnenden Urwählern zu Anerkennung der oktroyierten Verfassung (mit der Option einer späteren Revision), der konstitutionellen Monarchie sowie einer starken Regierung. Inaussichtstellung einer freien Gemeindeordnung. Im Interesse der arbeitenden Bevölkerung ist der Schutz des Eigentums
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Welsch (Projektbearbeiter): Verurteilung des Schauspielers Freiherr von Brand sowie des Hausmeisters Halmdienst zu zehn- bzw. sechsmonatiger Kerkerhaft wegen bewaffneten Aufruhrs
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Welsch (Projektbearbeiter): Festgedicht anläßlich eines 'demokratischen Balls', das auch angesichts der Niederschlagung der Revolution trotzige Siegesgewißheit für die Zukunft ausdrückt
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M. Adler
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Frank
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M. Adler
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Israele Zoller