RRAF Report

Smith-Yoshimura K, Altman M, Conlon M, et al. Registering Researchers in Authority Files. online: OCLC Research; 2014.Registering researchers in some type of authority file or identifier system has become more compelling as both institutions and researchers recognize the need to compile their scholarly output. The report presents functional requirements and recommendations for six stakeholders: researchers, funders, university administrators, librarians, identity management systems, and aggregators (including publishers). It also provides an overview of the researcher identifier landscape, changes in the field, emerging trends, and opportunities

SACO and Subject gateways [English version presented at the International Conference] = SACO e i Subject gateways [Versione italiana presentata alla Conferenza internazionale]

In researching the topic of my presentation it was my task to determine if the SACO Program component of the Program for Cooperative Cataloging (PCC) could be related to subject gateways or if it might be considered a subject gateway in its own right. SACO is described as the subject component of the Program for Cooperative Cataloging. Within the PCC framework it is SACO that allows catalogers to submit subject heading proposals for possible inclusion in the list of Library of Congress Subject Headings (LCSH) and allows for the modification of existing subject headings and/or modification of the existing subject heading hierarchy

Wavelet Packet Thresholding and Spectrum Estimation

We consider the recent suggestion that spectrum estimation can be accomplished by applying wavelet denoising methodology to wavelet packet coefficients derived from the logarithm of a spectrum estimate. The particular algorithm we consider consists of computing the logarithm of the multitaper spectrum estimator,applying an orthonormal transform derived from a wavelet packet table to the log multitaper spectrum ordinates, thresholding the empirical wavelet packet coefficients,and then inverting the transform. For a small number of tapers suitable partitions/bases for different stationary time series are all similar,and easily derived,and any differences between the wavelet packet and DWT approaches are minimal. For a larger number of tapers, where the chosen parameters satisfy the conditions of a proven theorem,nothing can be gained over the simpler discrete wavelet transform (DWT) thresholding approach. We thus conclude that the DWT approach is a very adequate wavelet-based approach,and that nothing substantial will be gained by using more complicated wavelet packets

Evaluación comparativa de la producción de un cultivo experimental de maíz fertilizado con vermicompost frente al agro químico triple 15 en el departamento del Meta, estudio de caso San Martín

Las actividades de los seres humanos, a través de los años se han caracterizado por la explotación de los recursos naturales y la utilización desmesurada de sustancias contaminantes y tóxicas, para obtener una mayor producción industrial, sin pensar en el agotamiento de dichos recursos. Como consecuencia, se afectan negativamente los ecosistemas y se atenta contra la salud pública. En la actualidad, la aplicación de mecanismos de los efectos ambientales negativos producidos por el uso excesivo de agro químicos altamente tóxicos. A nivel mundial, se están realizando varias investigaciones sobre nuevas alternativas ecológicas, entre ellas se encuentra los biofertilizantes.Tesis de grado.PregradoIngeniero(a) Ambienta

On some stationary models: construction and estimation

We propose a simple yet powerful method to construct strictly stationary Markovian models with given, but arbitrary, invariant distributions. The idea is based on a Poisson transform modulating the dependence structure in the model. An appealing feature of our approach is that we are able to fully control the underlying transition probabilities and therefore incorporate them within standard estimation methods. We analyze some specific cases in both discrete and continuous time. Given our proposed representation of the transition density, a Gibbs sampler algorithm, based on the slice method, is proposed and implemented. In particular, the resulting methodology is of interest for the estimation of certain continuous time models, such as diffusion processes