Santiago Alexander Rivera - Academia.edu (original) (raw)

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Papers by Santiago Alexander Rivera

Revista Arbitrada Interdisciplinaria Koinonía, 2020

In Ecuador, a government institution is responsible for applying regulations for official animal ... more In Ecuador, a government institution is responsible for applying regulations for official animal control of rabies and reducing to non-dangerous levels. However, in Orellana, no documented bibliography serves as a resource to assess risk. An observational study was carried out of the bovine rabies outbreaks occurrences from 2012 to 2018 period. With the SAS statistical package were obtained; descriptive statistics as well as interquartile values of the cases presented for then build an endemic channel and shows accumulated prevalence rate for each year. We resulted indicated that was presented a total of 44 cases to rabies during all period study. Finally, we can tell the frequency of the disease did not show marked seasonality due to climatic factors.

European Scientific Journal ESJ, 2019

This paper focuses on identifying and characterizing the structure, function, as well as the use ... more This paper focuses on identifying and characterizing the structure, function, as well as the use of technology of the livestock systems on the spatial, socioeconomic, and environmental dynamics in which livestock is developed in the Quijos Valley (Ecuador). The methodology was based on shows an atypical distribution in the first two typologies. This is because there is no balance according to each bovine category, thus having a significant effect on productivity. Meanwhile in the group of high use of technology, there are bovine animals of pure milk production or crosses (Jersey, Holstein). It is concluded that there is a wide divergence between the livestock systems identified and characterized in the Quijos Valley. Thus, the measure gained in intensification has been lost in conservation.

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Geoenseñanza. Universidad de los Andes. geoense@nutula.tach.ula.ve. ISSN (Versión impresa): 1316-... more Geoenseñanza. Universidad de los Andes. geoense@nutula.tach.ula.ve. ISSN (Versión impresa): 1316-6077. VENEZUELA. 2002. José Armando Santiago Rivera. REPERCUSIONES DE LA GEOGRAFÍA DE LA TELEVISIÓN EN ...

IEEE Transactions on Signal Processing, 2010

This paper describes performance bounds for compressed sensing (CS) where the underlying sparse o... more This paper describes performance bounds for compressed sensing (CS) where the underlying sparse or compressible (sparsely approximable) signal is a vector of nonnegative intensities whose measurements are corrupted by Poisson noise. In this setting, standard CS techniques cannot be applied directly for several reasons. First, the usual signal-independent and/or bounded noise models do not apply to Poisson noise, which is non-additive and signal-dependent. Second, the CS matrices typically considered are not feasible in real optical systems because they do not adhere to important constraints, such as nonnegativity and photon flux preservation. Third, the typical 2-1 minimization leads to overfitting in the high-intensity regions and oversmoothing in the low-intensity areas. In this paper, we describe how a feasible positivity-and flux-preserving sensing matrix can be constructed, and then analyze the performance of a CS reconstruction approach for Poisson data that minimizes an objective function consisting of a negative Poisson log likelihood term and a penalty term which measures signal sparsity. We show that, as the overall intensity of the underlying signal increases, an upper bound on the reconstruction error decays at an appropriate rate (depending on the compressibility of the signal), but that for a fixed signal intensity, the signal-dependent part of the error bound actually grows with the number of measurements or sensors. This surprising fact is both proved theoretically and justified based on physical intuition.

FEBS Letters, 2012

In skeletal muscle atrophy, upregulation and nuclear accumulation of the Ubiquitin E3 ligase MAFb... more In skeletal muscle atrophy, upregulation and nuclear accumulation of the Ubiquitin E3 ligase MAFbx is essential for accelerated muscle protein loss, but the nuclear/cytoplasmic shuttling of MAFbx is undefined. Here we found that MAFbx contains two functional nuclear localization signals (NLS). Mutation or deletion of only one NLS induced cytoplasmic localization of MAFbx. We identified a non-classical NES located in the leucine charged domain (LCD) of MAFbx, which is leptomycin B insensitive. We demonstrated that mutation (L169Q) in LLXXL motif of LCD suppressed cytoplasmic retention of MAFbx. Nucleocytoplasmic shuttling of MAFbx represents a novel mechanism for targeting its substrates and its cytosolic partners in muscle atrophy.

Geoenseñanza, 2005

Resumen En Venezuela, la enseñanza de la geografía es un ámbito pedagógico, notablemente, cuestio... more Resumen En Venezuela, la enseñanza de la geografía es un ámbito pedagógico, notablemente, cuestionado por su desfase con los acontecimientos del mundo contemporáneo, entre otras,.debido a la apatía para asumir desde una conciencia crítica, los cambios inducidos por el Nuevo Orden Económico Mundial; como por otra, a la falta de coherencia con la transformación de la realidad geográfica nacional. Es un problema significativo la vigencia de la transmisión de contenidos programáticos ciertamente diferente a los renovados fundamentos geográficos, pedagógicos y didácticos que promueven la elaboración crítica del conocimiento geográfico y el entendimiento desde diversos puntos de vista sobre los acontecimientos de la realidad geográfica.

... prestigious Award in Music by the American Academy of Arts and Letters. Additionally, Sierra ... more ... prestigious Award in Music by the American Academy of Arts and Letters. Additionally, Sierra became the first Puerto Rican composer nominated for a Grammy Award in the classical category in 1999.1 In recent years, Sierra has produced a significant body of instrumental ...

Animals, 2020

A study was conducted at the Escuela Superior Politècnica de Chimborazo, Ecuador, to evaluate the... more A study was conducted at the Escuela Superior Politècnica de Chimborazo, Ecuador, to evaluate the influence of litter size of guinea pigs (Cavia porcellus) on their development and to establish the economic profitability of the production system. Forty-eight animals were used, distributed into litters of two, three, and four rodents per litter, with a balanced diet and green fresh alfalfa for the weaning, growth, and fattening stage, the rodents and litters were randomly selected, applying the statistical model completely randomly and evaluating different variables across 120 days. The litters of three guinea pigs obtained the best productive responses and economic profitability. With respect to sex, the males presented better productive behavior, greater economic increase, and less cost, evidencing that mixed feeding influences the number of guinea pigs per birth in terms of growth and development. The results serve to improve guinea pig meat production for the rural population.

Earthquake Engineering and Engineering Vibration, 2014