Educação matemática pela arte
Gusmão, Lucimar Donizete
2013-08-28
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14,882 records were found.
Also PCMA Working Paper #15.
We have conducted a multi-model intercomparison of cloud-water in five state-of-the-art AGCMs run for control and doubled carbon dioxide climates. The most notable feature of the differences between the control and doubled carbon dioxide climates is in the distribution of cloud-water in the mixed-phase temperature band. The difference is greatest at mid and high latitudes. We found that the amount of cloud ice in the mixed phase layer in the control climate largely determines how much the cloud-water distribution changes for the doubled carbon dioxide climate. Therefore evaluation of the cloud ice distribution by comparison with data is important for future climate sensitivity studies. Cloud ice and cloud liquid both decrease in the layer below the melting layer, but only cloud liquid increases in the mixed-phase layer. Although the de...
The quadratic variation of functionals of the two-parameter Wiener process of the form f(W(s, t)) is investigated, where W(s, t) is the standard two-parameter Wiener process and f is a function on the reals. The existence of the quadratic variation is obtained under the condition that f' is locally absolutely continuous and fN is locally square integrable.
No abstract.
The interpenetration function Psi of a dilute solution of long randomly coiling molecules may be calculated by renormalisation group methods. This quantity is of special interest since it is entirely due to excluded volume effects. Two renormalisation methods give values for the excluded volume limit of Psi which are consistent with current experimental values. This indicates that the limiting value of Psi is easier to measure than previously thought. The experimental deviations from this limit can be well represented by a simple standard corrections-to-scaling formula. The authors also calculate the limiting ratio of average end-to-end distance to radius of gyration of these molecules. There is a small difference from the random chain value.
The spectral-fitting method of correction for gamma-ray Compton scattering within objects separates the unscattered and scattered components of locally measured energy spectra. Here, the authors employ a third-order polynomial for the scattering and an approximately constant fitting window. A scatter fraction, defined as total scattered over total unscattered counts within a 20% window, is calculated for each point in the Anger camera images. These scatter fractions are tested against those from Monte-Carlo simulation for 99mTc and against results from semiconductor detector measurements for 131I. A radioactive sphere at several locations within a non-radioactive cylinder and the inverse are imaged for the testing. For one case, reproducibility of the spectral-fitting scatter fraction as a function of the number of unscattered counts w...
The human health component of an LCIA aims to assess in a comparative way the multiple impacts and large number of toxic substances that are involved in the life cycle of products. This often differs from the scope of regulatory toxicological assessments, which generally focus on ensuring that safe doses are not surpassed by exposures at any location or point in time.
