La2O3/CaO catalysts were prepared at different weight percentages of La2O3.Por the coprecipitation method described porRaO, CaCO3 is prepared and then it was impregnated in a solution of La (NO) 3.6H2O thus obtaining the catalyst precursor . precursors dried at 393K and calcined at 973K, obtaining 0-15% La2O3/CaO catalysts. XRF elemental qualitative analysis was performed. By FTIR carbonates adsorbed species was observed. The presence of La2O3 and CaO phases was confirmed by XRD and BET surface area of the catalyst giving values ​​less than 9m2 / g The measurement of the activity for La2O3/CaO cataluzador 15% was measured, it was performed in a microreactor quartz, using a feed rate of methane / oxygen ratio of 4:1 and the reaction temperatures of 923, 973 and 1023 K, resulting in a maximum conversion temperature of 1023K of 26.84% methane conversion and selectivity to C2 + of 38.17%...

lt has been prepared six multiphasic masic catalysts of the Fe-Mo-Sb system, which were characterized by X-ray difraction, Mossbauer Spectroscopy, BET and scanning electronic microscopy. All catalysts were tested in the reaction of oxidative dehydrogenation of ethanol to acetaldehyde. The catalyst Fe2(MoO4)3 + α-Sb2O4 was showed the highest yield and selectivity to acetaldehyde following by FeSbO4 of all prepared catalysts.

In the present work are synthesized a series of oxides of the system of MgO/CaO, with different proportions in the cations, by the method of coprecipitation of Rao on carbonates precursors and their subsequent calcination to 1173 ºK. The carbonates precursors as the final oxides were analyzed by X Ray Fluorescence, Atomic Absorption and Neutronic Activation. The identification of the different crystalline phases are realized by X-rays Difraction and the presence of adsorbates carbonates species by Fourier Transformed lnfrared Spectroscopy.

Nickel -based catalysts were prepared by impregnation and subsequent calcination at a concentration of 10 % by weight on the following substrates : clay , Ti02 , Si02 and Al 203 . These were reduced in a stream of 20 % hydrogen / nitrogen at a temperature of 350 ° C for 2 hours and were characterized by X-ray diffraction with activity measurements determined that the different supports affects performance . The increasing order of performance of the catalysts with different supports in oil hydrogenation process is as follows: clay > Ti02 > at 20 3> Si02 . Activity results show that the clay has a good performance in the hydrogenation process reaching iodine decrease of sunflower oil from 150 076 to the value of 56.77 to a temperature of 280 ° C

The objective of this work is the transformation of fructose to 4-hydroxymethylfurfural by a dehydratation process using the 4-toluenesulfonic acid as catalyst . The reaction was carried out using solutions of fructose in water and fructose in water-acetone (50% volume) in a batch reactor at temperatures of 372 K and 348 K respectively. The yield reached a maximum of 16% to hydroxymethylfurfural, an intermediate for obtaining fuel furan.

La2O3/CaO catalysts were prepared at different weight percentages of La2O3.Por the coprecipitation method described porRaO, CaCO3 is prepared and then it was impregnated in a solution of La (NO) 3.6H2O thus obtaining the catalyst precursor . precursors dried at 393K and calcined at 973K, obtaining 0-15% La2O3/CaO catalysts. XRF elemental qualitative analysis was performed. By FTIR carbonates adsorbed species was observed. The presence of La2O3 and CaO phases was confirmed by XRD and BET surface area of the catalyst giving values ​​less than 9m2 / g The measurement of the activity for La2O3/CaO cataluzador 15% was measured, it was performed in a microreactor quartz, using a feed rate of methane / oxygen ratio of 4:1 and the reaction temperatures of 923, 973 and 1023 K, resulting in a maximum conversion temperature of 1023K of 26.84% methane conversion and selectivity to C2 + of 38.17%...

lt has been prepared six multiphasic masic catalysts of the Fe-Mo-Sb system, which were characterized by X-ray difraction, Mossbauer Spectroscopy, BET and scanning electronic microscopy. All catalysts were tested in the reaction of oxidative dehydrogenation of ethanol to acetaldehyde. The catalyst Fe2(MoO4)3 + α-Sb2O4 was showed the highest yield and selectivity to acetaldehyde following by FeSbO4 of all prepared catalysts.

In the present work are synthesized a series of oxides of the system of MgO/CaO, with different proportions in the cations, by the method of coprecipitation of Rao on carbonates precursors and their subsequent calcination to 1173 ºK. The carbonates precursors as the final oxides were analyzed by X Ray Fluorescence, Atomic Absorption and Neutronic Activation. The identification of the different crystalline phases are realized by X-rays Difraction and the presence of adsorbates carbonates species by Fourier Transformed lnfrared Spectroscopy.

Nickel -based catalysts were prepared by impregnation and subsequent calcination at a concentration of 10 % by weight on the following substrates : clay , Ti02 , Si02 and Al 203 . These were reduced in a stream of 20 % hydrogen / nitrogen at a temperature of 350 ° C for 2 hours and were characterized by X-ray diffraction with activity measurements determined that the different supports affects performance . The increasing order of performance of the catalysts with different supports in oil hydrogenation process is as follows: clay > Ti02 > at 20 3> Si02 . Activity results show that the clay has a good performance in the hydrogenation process reaching iodine decrease of sunflower oil from 150 076 to the value of 56.77 to a temperature of 280 ° C

The objective of this work is the transformation of fructose to 4-hydroxymethylfurfural by a dehydratation process using the 4-toluenesulfonic acid as catalyst . The reaction was carried out using solutions of fructose in water and fructose in water-acetone (50% volume) in a batch reactor at temperatures of 372 K and 348 K respectively. The yield reached a maximum of 16% to hydroxymethylfurfural, an intermediate for obtaining fuel furan.

The aim of the study was the hydrogenation reaction on a catalyst Citral Pd-Fe/MgO and the reaction selectivity towards the different products obtained. Citral hydrogenation is performed in a batch reactor at 60° C with a solution of 2-propanol as solvent. The results show that the catalyst is Pd-Fe/MgO very active in the hydrogenation of the double bond adjacent to the carbonyl in the Citral and that catalyst activity sharply declines last 10 minutes of the reaction.

El objetivo del trabajo es estudiar la reacción dehidrogenación del Citral sobre un catalizador de Pd-Fe/MgO y la selectividad de la reacción hacia los diferentes productos obtenidos.La hidrogenación de Citral se realiza en un reactor batcha 60°C con una solución con 2-propanol como solvente. Los resultados demuestran que el catalizador de Pd-Fe/MgO es muy activo en la hidrogenación del enlacedoble adyacente al carbonilo en el Citral y que la actividad del catalizador decae fuertemente pasado los 10 minutos de reacción.

Intermittent photic stimulation (IPS) is one of the most common and well-known activation methods used during routine EEG recordings. However, although it is the most straightforwardly standardized activation technique, its methodology still has significant variability, and the interpretation and classification of photoparoxysmal response (PPR) remain largely subjective. Objective: This review aims to provide an updated reference about the standardized methodology to perform the IPS procedure. Additionally, it intends to provide an update on the interpretation and classification of the PPR. A critical analysis about current practical/clinical challenges is formulated, and some potential operational criteria to improve the interrater agreement for the confirmation of PPR are proposed. Conclusions: Proposed operational criteria include, but are not limited to morphology, amplitude, duratio...

En la investigación realizada el objetivo fue determinar la influencia de los factores ambientales como temperatura y humedad relativa, en la distribución temporal de las especies de trips y controladores biológicos. Las especies reportadas pertenecen al Orden Thysanoptera, familia Thripidae: Frankliniella parvula y Chaetanaphotrips signipennis, en Controladores biológicos se reporta a la especie Karnyothrips flavipes, que fueron identificadas morfológicamente en el Laboratorio de Entomología de la Facultad de Ciencias Agrarias de la Universidad Nacional de Tumbes y corroborada en el Laboratorio de Entomología del Departamento de Sanidad Vegetal de la Facultad de Agronomía de la Universidad Nacional de Piura. Siendo la segunda de las especies antes mencionadas la más importante debido a las altas poblaciones y económicamente debido a los daños que ocasiona a la fruta, así com...

En la investigación realizada el objetivo fue determinar la influencia de los factores ambientales como temperatura y humedad relativa, en la distribución temporal de las especies de trips y controladores biológicos. Las especies reportadas pertenecen al Orden Thysanoptera, familia Thripidae: Frankliniella parvula y Chaetanaphotrips signipennis, en Controladores biológicos se reporta a la especie Karnyothrips flavipes, que fueron identificadas morfológicamente en el Laboratorio de Entomología de la Facultad de Ciencias Agrarias de la Universidad Nacional de Tumbes y corroborada en el Laboratorio de Entomología del Departamento de Sanidad Vegetal de la Facultad de Agronomía de la Universidad Nacional de Piura. Siendo la segunda de las especies antes mencionadas la más importante debido a las altas poblaciones y económicamente debido a los daños que ocasiona a la fruta, así com...

Propone actualizar los estudios literarios peruanos a través de una perspectiva contemporánea de la investigación en las humanidades: la multiplicidad de enfoques críticos desde los cuales se reflexiona en torno a la literatura.