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Search Results: 1 - 10 of 299197 matches for " J. Patrocinio;Valadez-Montoya "
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Biomasa y rendimiento de frijol tipo flor de junio bajo riego y sequía
Acosta-Díaz, Efraín;Amador-Ramírez, Mario Domingo;Padilla-Ramírez, José Saúl;Gómez-Delgado, J. Patrocinio;Valadez-Montoya, Heladio;
Agricultura técnica en México , 2007,
Abstract: in the state of zacatecas, mexico 200 thousand ha of dry bean flor de junio class are annually sown, and its yield average is 315 kg ha-1. this low yield is due to intermittent drought during the growing season. the objective was to determine the effect of different soil moisture levels on plant maturity, shoot and root dry weight per plant, root-shoot ratio and yield of four bean genotypes. in 2002, two trials were conducted; one under greenhouse conditions and the other in the field at the unidad de agronomía of the universidad autónoma de zacatecas. in the greenhouse four soil moisture levels in 3 kg pots were evaluated; one without drought and three from moderate to severe stress: a) irrigated (r), 100% of the evapotranspired water was restituted every 12 h during the cycle, b) moderate drought (sm), 75% of the volume of r was restituted, c) severe drought (ss), 50% of the volume of r was restituted and d) moderate drought during the vegetative stage and severe drought during the reproductive stage (smv+ssr). in the field, two treatments were tested: rainfed (s), depending on rainfall and rainfed plus supplemental irrigation (s+r), with rainfall, contribution and three irrigations as needed. the stress treatments affected negatively all traits in the genotypes in comparison with r and s+r treatments in greenhouse and field, respectively. in the greenhouse; in comparison to the control (r) the average reductions observed with the smv+ssr treatment were: seven days to mature, 26% in shoot dry weight, 44% in root dry weight and 53% in yield. the negative effects increased accordingly to the drought level applied, except for root-shoot ratio, which increased with the stress. under field conditions, the average reductions under the rainfed treatment (s) as compared to (s+r) were: 13 days for maturity, 34% in shoot dry weight and 48% in yield. on the basis of yield reduction, drought susceptibility index and geometric mean of yield, lines uaz fj 2 and uaz fj 3 resulte
Multiple Category-Lot Quality Assurance Sampling: A New Classification System with Application to Schistosomiasis Control
Casey Olives,Joseph J. Valadez ,Simon J. Brooker,Marcello Pagano
PLOS Neglected Tropical Diseases , 2012, DOI: 10.1371/journal.pntd.0001806
Abstract: Background Originally a binary classifier, Lot Quality Assurance Sampling (LQAS) has proven to be a useful tool for classification of the prevalence of Schistosoma mansoni into multiple categories (≤10%, >10 and <50%, ≥50%), and semi-curtailed sampling has been shown to effectively reduce the number of observations needed to reach a decision. To date the statistical underpinnings for Multiple Category-LQAS (MC-LQAS) have not received full treatment. We explore the analytical properties of MC-LQAS, and validate its use for the classification of S. mansoni prevalence in multiple settings in East Africa. Methodology We outline MC-LQAS design principles and formulae for operating characteristic curves. In addition, we derive the average sample number for MC-LQAS when utilizing semi-curtailed sampling and introduce curtailed sampling in this setting. We also assess the performance of MC-LQAS designs with maximum sample sizes of n = 15 and n = 25 via a weighted kappa-statistic using S. mansoni data collected in 388 schools from four studies in East Africa. Principle Findings Overall performance of MC-LQAS classification was high (kappa-statistic of 0.87). In three of the studies, the kappa-statistic for a design with n = 15 was greater than 0.75. In the fourth study, where these designs performed poorly (kappa-statistic less than 0.50), the majority of observations fell in regions where potential error is known to be high. Employment of semi-curtailed and curtailed sampling further reduced the sample size by as many as 0.5 and 3.5 observations per school, respectively, without increasing classification error. Conclusion/Significance This work provides the needed analytics to understand the properties of MC-LQAS for assessing the prevalance of S. mansoni and shows that in most settings a sample size of 15 children provides a reliable classification of schools.
El teorema de Cayley revisitado
MONTOYA,J. ANDRéS;
Revista Colombiana de Matemáticas , 2009,
Abstract: en este artículo probamos que no existe un n∈ n tal que todo grupo finito puede ser embebido en gl\mathbbc( n).
El teorema de Cayley revisitado The theorem of Cayley revisited
J. ANDRéS MONTOYA
Revista Colombiana de Matemáticas , 2009,
Abstract: En este artículo probamos que no existe un N∈ N tal que todo grupo finito puede ser embebido en GLmathbbC( N). In this paper we prove that there not exists N∈ N such that any finite group can be embbeded into GLmathbbC( N).
O desenho e suas rela es com a linguagem escrita em alunos portadores de deficiência mental
Wanda Pereira Patrocinio
ETD : Educa??o Temática Digital , 2001,
Abstract:
The almost-entropic regions are not semialgebraic
Carolina Mejia,J. Andres Montoya
Mathematics , 2015,
Abstract: We prove that the almost-entropic region of order four is not semialgebraic, we get as a corollary the well-known Theorem of Matus, which asserts that this region is not polyhedral
Relationship between the Environment and Economic Growth in China via Exports: A Perspective of Ecological Impact (2000-2014)  [PDF]
Guillermo Velázquez Valadez, Jiaqi Hu
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.711136
Abstract:
China’s swift and substantial economic growth over the past 20 years has made the country one of the top industrial powers in the world, second only the United States. From the perspective of ecology and the impact on the environment produced by economic and industrial growth, the exports that have driven rapid growth have also resulted in an alarming level of environmental pollution in major Chinese cities. Research has shown that the Chinese government’s investment in bringing down pollution levels has been insufficient and ineffective. The monetary amount allocated for pollution reduction has barely reached 0.15% of the country’s GDP and has failed to meaningfully reverse the effects of industrialization, including increased exports and economic growth rates affecting China’s ecology. The present study investigated China’s ecological situation in terms of the industrial production that has generated its level of exports, with special focus on problems related to water, air, and solid waste. An econometric analysis was conducted to determine the relationship between the main variables. The exports and GDP (dependent variable), air pollution, water pollution, and industrial solid waste (independent variables) were provided by the Institute of Statistics and the Environment Institute of China for this study. The data was managed in Econometric Eviews 7.0 software and yielded an adjusted R2 of 96.09% (high correlation) with an interesting correlation between the exports and three independent variables; after subsequent variable analysis, we found that investments in water and industrial solid waste were not significant (i.e., that said investments have failed to solve the pollution problem). It is necessary to review the Chinese investment policy with special attention to these variables to appropriately respond to China’s ecological crisis.
Lipid Modifications of Sonic Hedgehog Ligand Dictate Cellular Reception and Signal Response
Vandana K. Grover,J. Gerardo Valadez,Aaron B. Bowman,Michael K. Cooper
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0021353
Abstract: Sonic hedgehog (Shh) signaling regulates cell growth during embryonic development, tissue homeostasis and tumorigenesis. Concentration-dependent cellular responses to secreted Shh protein are essential for tissue patterning. Shh ligand is covalently modified by two lipid moieties, cholesterol and palmitate, and their hydrophobic properties are known to govern the cellular release and formation of soluble multimeric Shh complexes. However, the influences of the lipid moieties on cellular reception and signal response are not well understood.
Are Patent Medicine Vendors Effective Agents in Malaria Control? Using Lot Quality Assurance Sampling to Assess Quality of Practice in Jigawa, Nigeria
Sima Berendes, Olusegun Adeyemi, Edward Adekola Oladele, Olusola Bukola Oresanya, Festus Okoh, Joseph J. Valadez
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044775
Abstract: Background Patent medicine vendors (PMV) provide antimalarial treatment and care throughout Sub-Saharan Africa, and can play an important role in the fight against malaria. Their close-to-client infrastructure could enable lifesaving artemisinin-based combination therapy (ACT) to reach patients in time. However, systematic assessments of drug sellers’ performance quality are crucial if their role is to be managed within the health system. Lot quality assurance sampling (LQAS) could be an efficient method to monitor and evaluate PMV practice, but has so far never been used for this purpose. Methods In support of the Nigeria Malaria Booster Program we assessed PMV practices in three Senatorial Districts (SDs) of Jigawa, Nigeria. A two-stage LQAS assessed whether at least 80% of PMV stores in SDs used national treatment guidelines. Acceptable sampling errors were set in consultation with government officials (alpha and beta <0.10). The hypergeometric formula determined sample sizes and cut-off values for SDs. A structured assessment tool identified high and low performing SDs for quality of care indicators. Findings Drug vendors performed poorly in all SDs of Jigawa for all indicators. For example, all SDs failed for stocking and selling first-line antimalarials. PMV sold no longer recommended antimalarials, such as Chloroquine, Sulfadoxine-Pyrimethamine and oral Artesunate monotherapy. Most PMV were ignorant of and lacked training about new treatment guidelines that had endorsed ACTs as first-line treatment for uncomplicated malaria. Conclusion There is urgent need to regularly monitor and improve the availability and quality of malaria treatment provided by medicine sellers in Nigeria; the irrational use of antimalarials in the ACT era revealed in this study bears a high risk of economic loss, death and development of drug resistance. LQAS has been shown to be a suitable method for monitoring malaria-related indicators among PMV, and should be applied in Nigeria and elsewhere to improve service delivery.
Demodulation of Interferograms of Closed Fringes by Zernike Polynomials using a technique of Soft Computing
Luis Ernesto Mancilla Espinosa,Juan Martin Carpio Valadez,F.J. Cuevas
Engineering Letters , 2007,
Abstract:
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