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Search Results: 1 - 10 of 5178 matches for " Rodolfo;Alvarado Nava "
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"CEZAC 06": nueva variedad de ajo tipo Jaspeado para la región norte centro de México
Reveles-Hernández, Manuel;Velásquez-Valle, Rodolfo;Alvarado Nava, María Dolores;Rubio-Díaz, Salvador;
Revista mexicana de ciencias agrícolas , 2011,
Abstract: about 5 200 hectares of garlic are cultivated in mexico; the north-central region is one of the main producing areas of this vegetable. the lack of locally adapted varieties of garlic is a serious disadvantage for garlic producers. in this paper are mentioned the main agronomic characteristics of "cezac 06", a new garlic variety available for producers of zacatecas, aguascalientes, durango, chihuahua and coahuila. the main advantages of this variety are higher yield, consistently round bulbs, fewer numbers of cloves per bulb and homogeneous maturation. in commercial plots, yield has improved in 9-17% and there have been achieved yields of up to 30 t ha-1 using "cezac 06".
"CEZAC 06": nueva variedad de ajo tipo Jaspeado para la región norte centro de México "CEZAC 06": new Jaspeado garlic cultivar for the northem-central region of Mexico
Manuel Reveles-Hernández,Rodolfo Velásquez-Valle,María Dolores Alvarado Nava,Salvador Rubio-Díaz
Revista mexicana de ciencias agrícolas , 2011,
Abstract: Alrededor de 5 200 hectáreas de ajo son cultivadas en México donde la región norte centro, es una de las principales áreas productoras de esta hortaliza. La falta de variedades de ajo localmente adaptadas es una seria desventaja para los productores de ajo. En este reporte se mencionan las principales características agronómicas de "CEZAC 06", una nueva variedad de ajo disponible para los productores de los estados de Zacatecas, Aguascalientes, Durango, Chihuahua y Coahuila. Las principales ventajas de esta variedad son rendimientos más altos, bulbos consistentemente redondos, menor número de dientes por bulbo y maduración homogénea. En parcelas comerciales el rendimiento se ha mejorado en 9-17% y se han alcanzado rendimientos de hasta 30 t ha-1 con el uso de "CEZAC 06". About 5 200 hectares of garlic are cultivated in Mexico; the north-central region is one of the main producing areas of this vegetable. The lack of locally adapted varieties of garlic is a serious disadvantage for garlic producers. In this paper are mentioned the main agronomic characteristics of "CEZAC 06", a new garlic variety available for producers of Zacatecas, Aguascalientes, Durango, Chihuahua and Coahuila. The main advantages of this variety are higher yield, consistently round bulbs, fewer numbers of cloves per bulb and homogeneous maturation. In commercial plots, yield has improved in 9-17% and there have been achieved yields of up to 30 t ha-1 using "CEZAC 06".
Complicaciones Vasculares del Paciente Diabético
Rodolfo Alvarado-Herrera
Acta Médica Costarricense , 2001,
Abstract:
VALOR NUTRICIONAL DEL HENO DE TRANSVALA INOCULADO CON EL HONGO Pleurotus ostreatus sp
Rodolfo WingChing-Jones,Giselle Alvarado Retana
Agronomía Costarricense , 2009,
Abstract: Se analizó el valor nutricional del heno de Transvala utilizado en la producción del hongo comestible Pleurotus ostreatus. El heno fue analizado antes de inocular el hongo y después de la cosecha. Se determinó: materia seca (MS), proteína cruda (PC), extracto etéreo (EE), ceniza (Ce), digestibilidad in vitro de la MS (DIVMS), carbohidratos no fibrosos (CNF), fibra detergente neutro (FDN), fibra detergente ácido (FDA), lignina, nitrógeno ligado a la fibra detergente neutro (N-FDN) y a la fibra detergente ácida (N-FDA), nutrimentos digestibles totales (NDT) (1X), energía digestible (ED), energía metabolizable (EM), energía neta de lactancia (ENl), energía de mantenimiento (ENm) y energía neta de ganancia (ENg). Sobresalen niveles bajos de PC, DIVMS y NDT; y valores altos de lignina, FDN y FDA. El contenido de MS, FDN, hemicelulosa (He), lignina, CNF y EE presentó diferencias significativas, debidas al crecimiento del hongo. La variación en calidad en estas variables fue de (-) 48,75%, (-) 24,76%, (-) 80,22%, (-) 27,94%, (+) 51,52% y (-) 26,13%, respectivamente. La mejoría en la calidad nutricional del heno, después de la cosecha del hongo, no es tan significativa como para cambiar la perspectiva en su uso dentro de la ración total de rumiantes, por lo que el beneficio del heno se basa más en aspectos físicos que nutricionales.
A Study on the Influence of Luminance L* in the L*a*b* Color Space during Color Segmentation  [PDF]
Rodolfo Alvarado-Cervantes, Edgardo M. Felipe-Riveron, Vladislav Khartchenko, Oleksiy Pogrebnyak
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.43005
Abstract:

In this paper an evaluation of the influence of luminance L* at the L*a*b* color space during color segmentation is presented. A comparative study is made between the behavior of segmentation in color images using only the Euclidean metric of a* and b* and an adaptive color similarity function defined as a product of Gaussian functions in a modified HSI color space. For the evaluation synthetic images were particularly designed to accurately assess the performance of the color segmentation. The testing system can be used either to explore the behavior of a similarity function (or metric) in different color spaces or to explore different metrics (or similarity functions) in the same color space. From the results is obtained that the color parameters a* and b* are not independent of the luminance parameter L* as one might initially assume.


Shedding light on the prompt high efficiency paradox - self consistent modeling of GRB afterglows
Paz Beniamini,Lara Nava,Rodolfo Barniol Duran,Tsvi Piran
Physics , 2015,
Abstract: We examine GRBs with both Fermi-LAT and X-ray afterglow data. Assuming that the 100MeV (LAT) emission is radiation from cooled electrons accelerated by external shocks, we show that the kinetic energy of the blast wave estimated from the 100MeV flux is 50 times larger than the one estimated from the X-ray flux. This can be explained if either: i) electrons radiating at X-rays are significantly cooled by SSC (suppressing the synchrotron flux above the cooling frequency) or ii) if the X-ray emitting electrons, unlike those emitting at 100MeV energies, are in the slow cooling regime. In both cases the X-ray flux is no longer an immediate proxy of the blast wave kinetic energy. We model the LAT, X-ray and optical data and show that in general these possibilities are consistent with the data, and explain the apparent disagreement between X-ray and LAT observations. All possible solutions require weak magnetic fields: $10^{-6}< \epsilon_B < 10^{-3}$ (where $\epsilon_B$ is the fraction of shocked plasma energy in magnetic fields). Using the LAT emission as a proxy for the blast wave kinetic energy we find that the derived prompt efficiencies are of order 15%. This is considerably lower compared with previous estimates (87% and higher for the same bursts). This provides at least a partial solution to the "prompt high efficiency paradox".
Energies of GRB blast waves and prompt efficiencies as implied by modeling of X-ray and GeV afterglows
Paz Beniamini,Lara Nava,Rodolfo Barniol Duran,Tsvi Piran
Physics , 2015, DOI: 10.1093/mnras/stv2033
Abstract: We consider a sample of ten GRBs with long lasting ($\gtrsim10^2\rm\,sec$) emission detected by Fermi/LAT and for which X-ray data around $1\,$day are also available. We assume that both the X-rays and the GeV emission are produced by electrons accelerated at the external forward shock, and show that the X-ray and the GeV fluxes lead to very different estimates of the initial kinetic energy of the blast wave. The energy estimated from GeV is on average $\sim50$ times larger than the one estimated from X-rays. We model the data (accounting also for optical detections around $1\,$day, if available) to unveil the reason for this discrepancy and find that good modelling within the forward shock model is always possible and leads to two possibilities: either the X-ray emitting electrons (unlike the GeV emitting electrons) are in the slow cooling regime or ii) the X-ray synchrotron flux is strongly suppressed by Compton cooling, whereas, due to the Klein-Nishina suppression, this effect is much smaller at GeV energies. In both cases the X-ray flux is no longer a robust proxy for the blast wave kinetic energy. On average, both cases require weak magnetic fields ($10^{-6}\lesssim \epsilon_B \lesssim 10^{-3}$) and relatively large isotropic kinetic blast wave energies $10^{53}\rm\,erg
A High-Resolution Modeling Strategy to Assess Impacts of Climate Change for Mesoamerica and the Caribbean  [PDF]
Robert Oglesby, Clinton Rowe, Alfred Grunwaldt, Ines Ferreira, Franklyn Ruiz, Jayaka Campbell, Luis Alvarado, Francisco Argenal, Berta Olmedo, Alejandro del Castillo, Pilar Lopez, Edwards Matos, Yosef Nava, Carlos Perez, Joel Perez
American Journal of Climate Change (AJCC) , 2016, DOI: 10.4236/ajcc.2016.52019
Abstract: Mesoamerica and the Caribbean are low-latitude regions at risk for the effects of climate change. Global climate models provide large-scale assessment of climate drivers, but, at a horizontal resolution of 100 km, cannot resolve the effects of topography and land use as they impact the local temperature and precipitation that are keys to climate impacts. We developed a robust dynamical downscaling strategy that used the WRF regional climate model to downscale at 4 - 12 km resolution GCM results. Model verification demonstrates the need for such resolution of topography in order to properly simulate temperatures. Precipitation is more difficult to evaluate, being highly variable in time and space. Overall, a 36 km resolution is inadequate; 12 km appears reasonable, especially in regions of low topography, but the 4 km resolution provides the best match with observations. This represents a tradeoff between model resolution and the computational effort needed to make simulations. A key goal is to provide climate change specialists in each country with the information they need to evaluate possible future climate change impacts.
OBTENCIóN DE ESCLEROCIOS DE MORILLA (Morchella esculenta) EN DIFERENTES MEDIOS DE CULTIVO
Alvarado-Castillo,Gerardo; Mata,Gerardo; Nava Tablada,Martha Elena; Martínez-Carrera,Daniel; Platas Rosado,Diego Esteban;
Interciencia , 2008,
Abstract: morchella esculenta is an edible mushroom of high commercial value and obtaining sclerotia is considered important for its cultivation. in this work, the growth of the ie-750 strain was studied in eight solid and six liquid culture media. parameters assessed were mycelial growth, production of biomass, and ability to produce sclerotia and their biomass. the best mycelial growth was obtained in the treatment containing compost extract (t7: 53.87cm2), while the highest production of biomass was recorded in the treatment containing yeast (t3: 80.3mg). treatments with poultry manure and compost showed 40 and 80% of sclerotia in solid and liquid media, respectively, and the highest sclerotia biomass was recorded in the compost treatment (solid medium). sclerotia were obtained in periods of 9-12 days (solid medium) and 7-9 days (liquid medium).
Sintomatología persistente en trabajadores industrialmente expuestos a plaguicidas organofosforados
Palacios-Nava,Martha Edilia; Paz-Román,Pilar; Hernández-Robles,Silvia; Mendoza-Alvarado,Laura;
Salud Pública de México , 1999, DOI: 10.1590/S0036-36341999000100007
Abstract: objective. to describe the patterns of persistent symptomatology in workers industrially exposed to organophosphate pesticides. material and methods. an observational, descriptive and cross-sectional study was performed. a questionnaire was applied to managers of a factory and to 89 workers, whose erythrocytic cholinesterase level was measured with the magnotti and lovibond method. information is described through rates, central tendency measures and dispersion. differences between groups were evaluated with the c2 test and the odds ratio was calculated. results. persistent symptomatology was found in 6.3 per 10 workers. 50% had six or more symptoms. no significant differences were found as to the risk of suffering from persistent symptomatology with respect to age, length of service or position at work. however, the highest proportion of symptoms was found in workers of 31 to 40 years of age, with 6 to 13 years of service, from the maintenance area, working as general operators or supervisors. among the 13 workers with previous intoxication, the prevalence of persistent symptomatology was 6.9 against 6.1 in workers who had not been intoxicated before. the risk of acute poisoning in workers with more than 14 years of service was 4 times greater than in workers with less than 14 years of service (p<0.005). average level of blood cholinesterase was normal (4.4 u/ml). conclusions. results show a relationship between exposure to organophosphate pesticides and presence of persistent symptoms. it is necessary to study the prevalence of this symptomatology in exposed and non-exposed populations.
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