نتایج جستجو برای: n14
تعداد نتایج: 120 فیلتر نتایج به سال:
We present the results of measurements of the angular distribution lg7 and Bi of fission fragments produced by irradiation of Au 209 with 11 various heavy ions. The projectiles, B , G'l2, N14, and 016, had energies from a few MeV above the Coulomb barrier to 10.4 MeV per nucleon. The gross features of these results can be explained by use of a model and parameters that have been used by others ...
This study introduces advertisement into the dynamic nonlinear duopoly model. It demonstrates three major findings. The first is that the model can be destabilized via either flip bifurcation or Hopf bifurcation, the second is that a half-pitchfork bifurcation of output occurs when the advertisement dynamics is periodic and the nonlinearity of the output dynamics becomes stronger, and the third...
There is renewed interest in ethanol production, and sugarcane promises to be a sustainable ethanol source. Few studies have been done on the effect of season on biomass production, and no studies have quantified yields of a range of cultivars in terms of intercepted radiation. The objective of this study was therefore to assess how season affects the biomass yields of a number of commercial cu...
We study the classic transfer problem of predicting the effects of an international transfer on the terms of trade and the current account. A two-countrymodel with debt and capital allows for realistic features of historical transfers: they follow wartime increases in government spending and are financed partly by borrowing. The model is applied to the largest historical transfer, the Franco-Pr...
Was Germany Ever United? Evidence from Intraand International Trade, 1885 -1933* This paper asks whether Germany was ever an economically integrated area. I explore the geography of trade costs in a new data set of about 40,000 observations on regional trade flows within and across the borders of Germany over the period 1885 – 1933. There are three key results. First, the German Empire before 1...
The severity of the Great Depression in Germany has sometimes been blamed on reparations in simplistic fashion. Alternative interpretations relied on American capital exports, the demise of the Gold Standard, or on malfunctions of the domestic economy, such as excessive wage increases during the 1920s. This paper argues for a more subtle link between Germany's slump and these policies. I explai...
Temperature variations impact on the balance between photosynthetic electron transport and electron-consuming assimilation reactions and transiently increase generation of reactive oxygen species (ROS). Previous studies demonstrated that the expression of C-repeat binding factors (CBFs), which activate cold acclimation reactions, respond to chloroplast ROS signals and that cold deacclimation is...
12 We present a novel application for quantitatively apportioning sources of organic matter in streambed 13 sediments via a coupled δH and δC compound-specific isotope analysis (CSIA) of leaf wax n14 alkane biomarkers using a Bayesian mixing model. Leaf wax extracts of 13 plant species were 15 collected from across three sub-environments (aquatic, bankside and terrestrial) and four plant 16 fun...
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