Educação matemática pela arte
Gusmão, Lucimar Donizete
2013-08-28
Search results
84,984 records were found.
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.
Evaluation research is a form of applied research that scrutinises how well a particular programme, practice, procedure or policy is operating. Evaluation researchers use both quantitative and qualitative research data to construct a collective picture of the programme under evaluation.Medical educators need to provide information about a particular programme using the methods of evaluation research in order to make a decision on the potential adoption, improvements and refinements of the programme. Improving curricula and pedagogical methods using these methods may enhance health care education.We provide an overview of the methods of evaluation research in the context of medical education. We discuss the application, general methodology, methods of collecting data and analysis for each type of evaluation research.The methods of evalu...
The emergency medicine (EM) and prehospital environments are unlike any other clinical environments and require special consideration to allow the successful implementation of clinical trials. This article reviews the specific issues involved in EM clinical trials and provides strategies from EM and non-EM trials to maximize recruitment and retention. While the evidence supporting some of these strategies is deficient, addressing recruitment and retention issues with specific strategies will help researchers deal with these issues in their funding applications and in turn develop the necessary infrastructure to participate in EM clinical trials.ACADEMIC EMERGENCY MEDICINE 2010; 17:1104–1112 © 2010 by the Society for Academic Emergency Medicine
