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1
tesis de grado
O bentazon (3-isopropil-1H-2,1,3 benzothiadizin-4-(3H)-ona-2,2-dióxido) é um herbicida pós-emergente é utilizado no controle de ervas que possui alta solubilidade em água e não se une às partículas do solo. Este trabalho propõe uma análise alternativa para sua detecção, através da titulação condutométrica do sal sódico de Bentazon em formulação comercial de herbicida. Os resultados indicaram que o ácido clorídrico entre os ácidos estudados se apresenta como o melhor ácido a ser utilizado como titulante com realização a temperatura de 5ºC e o tempo de 90 segundos. Este conjunto de parâmetros apresenta as melhores curvas condutométricas, menor tempo para estabilização das medidas, volume de equivalência mais preciso e a concentração mais próxima da rotulada na formulação comercial fornecida pelo fabricante.
2
tesis de grado
Los hábitos alimenticios son de gran importancia en la calidad de la salud de las personas. La población del estado de San Pablo (SP), la cual ofrece diversidad económica y cultural, representa un escenario importante de estudio para verificar el potencial de consumo de productos agroindustriales. Es reportado reducción del consumo de productos frescos, como frutas y vegetales, y aumento de productos ultraprocesados. Una alternativa de alimento saludable es la quinua que presenta una importante fuente de nutrientes. El objetivo fue verificar la aceptación de la quinoa como producto nutritivo, natural e saludable por los habitantes de SP. Fue realizada la evaluación de los hábitos de consumo usando un cuestionario online. Los resultados muestran que la quinua es reconocida como un grano bueno para la salud y que más del 60% de los entrevistados estarían dispuestos a incorporar la...
3
tesis de maestría
Descargue el texto completo en el repositorio institucional de la Universidade de São Paulo: DOIhttps://doi.org/10.11606/D.10.2021.tde-08022022-103242
4
tesis doctoral
El camu-camu es un recurso genético en la Amazonía con un gran potencial de uso por sus propiedades nutracéuticas, sin embargo, al ser un cultivo en proceso de domesticación, se deben desarrollar técnicas que ayuden en la adaptación ex situ. En este sentido, el objetivo fue determinar el coeficiente de cultivo (Kc) para el manejo del agua y domesticación del camu-camu (Myrciaria dubia (Kunth) McVaugh) en tierra firme, tanto por los métodos de lisimetría como por medición indirecta de la humedad en campo final. Para ambos métodos se utilizaron 6 plantas de camu-camu, cada una de 2, 4 y 6 años con características similares en altura, área foliar, diámetro del tallo y número de ramas basales y terminales. Para determinar Kc, fue necesario calcular ETo por el método Penman-Monteith / FAO, y ETc por balance hídrico en lisímetros y en campo final. El Kc determinado con ambos...
5
tesis de maestría
Analiza la estabilidad de las soluciones de Ni y de Pb en diferentes medios orgánicos a nivel de ngmL-1, investigando la influencia de la composición de estos medios en la estabilidad y respuesta analítica. Se investigó de Ni y Pb por GFAAS de algunos líquidos orgánicos en mezclas de n-octano con acetona, bromoformo y disulfuro de carbono. En relación a la estabilidad se prepararon soluciones por disolución directa de estándares orgánicos presentando pérdidas de Ni y Pb después de algunos minutos. Se observó una excelente estabilidad en los diferentes medios orgánicos con la formación de microemulsiones. Se agregaron Ni y Pb en forma acuosa y orgánica y se aplicó la modificación química convencional y permanente. Las etapas de secado y rampa presentaron influencia en la sensibilidad y se optimizaron. Las curvas analíticas acuosas presentaron mayores sensibilidades que...
6
artículo
Objective: To measure the influence of adopting digital wallets on the financial inclusion of street vendors in Cusco. Methods: A quantitative approach with an explanatory, prospective and analytical scope was employed. The design was non-experimental and cross-sectional. Information was collected through surveys, using a questionnaire as the instrument, which was applied to 242 participants. Data analysis was conducted using a linear regression model. Results: It was determined that the adoption of digital wallets has a significant and positive influence on financial inclusion (β = 1.938, p < 0.05); additionally, an optimal degree of determination was observed (R2 = 99 %). Regarding the dimensions of financial inclusion, a significant and positive influence of digital wallet adoption was also found (p < 0.05). Conclusion: The adoption of digital wallets has a significant...
7
tesis de grado
El consumo de Benzodiazepinas se encuentra relacionado a los aspectos médico-legales porque está asociado a actos delictivos como hurto, delitos contra la integridad sexual, dopajes, y desde el punto de vista clínico legal a la dependencia. Objetivo: Determinar una técnica selectiva por Cromatografía en Capa Fina para identificar Benzodiazepinas. Método: Se empleo la cromatografía en capa fina como una técnica selectiva de identificación de Benzodiazepinas, para ello se recolectaron muestras de orina de 26 personas voluntarias sanas que previamente se les había administrado Benzodiazepinas. El análisis se realizó en el laboratorio de toxicología de la Universidad Norbert Wiener y UNMSM. Resultado: La cromatografía en capa fina dio positivo para Benzodiazepinas y otras sustancias (Fenobarbital y Fenitoina) en 80% de las muestras de orina analizadas, se sugiere utilizar la t...
8
tesis de grado
La investigación titulada “Optimización de los gastos no deducibles para la determinación del impuesto a la renta en una empresa Hidrobiológica, Lima 2020”, tuvo como objetivo optimizar aquellos gastos no deducibles que incrementan el pago del impuesto a la renta. Hay que mencionar que todos los gastos que realiza una empresa son basadas a principios como la causalidad, objetividad, materialidad, Aplicando estos principios se evita realizar gastos y generar pago en exceso. Este trabajo de investigación se realizó con una metodología de enfoque mixto realizando análisis cuantitativas y cualitativas, así mismo basado en un sintagma Holístico, llegando a un nivel comprensivo de la investigación aplicando los diseños deductivos como inductivos basados al resultado encontrado de la población que es una empresa Hidrobiológica y la muestra del Estado de resultados y las hojas ...
9
tesis doctoral
As cascas dos frutos de Syzygium malaccense (pomarrosa), Myrciaria dubia (camu camu) e Pourouma cecropiifolia (uvilla), coletadas nos arredores da cidade de Iquitos, foram processadas e acondicionadas como matéria-prima para obtenção de extratos. A extração foi realizada utilizando n-etanol (96° GA) como solventes e, posteriormente, os extratos etanólicos foram concentrados em sistema de evaporador rotativo a 65°C, 750 mbar e 60 rpm, até a obtenção dos corantes naturais. A identificação dos compostos foi realizada por meio de ensaios químicos e análise espectrofotométrica UV-Vis. Os resultados da determinação de compostos fenólicos totais e da capacidade antioxidante, avaliados pelos métodos DPPH e ABTS, mostraram alta atividade antioxidante em todas as espécies analisadas. Antocianinas e flavonoides do tipo flavona são identificados em Syzygium malaccense; Em Myrci...
10
tesis doctoral
Descargue el texto completo en el repositorio institucional de la Universidade Estadual Paulista: http://hdl.handle.net/11449/152169
11
artículo
The present work was centred on the study of potassium ethylxanthate, EtX-K+, which displays a remarkable selectivity and is widely employed in the treatment of sulphide ore. It was synthesised in our laboratory and its characterisation was performed, alongside with purity assessment, by analytical assays (IR,UV) as well as by decomposition studies. In particular, we aimed to develop the polarography procedure: DC(tast) method coupled with a modern dropping mercury electrode. (SMDE) for the determination of EtX-K+, enabled us to obtain defined and reproducible anodic waves. The investigation was carried out in the presence of NaOH as a supporting electrolyte at pH 12.6 within a broad concentration range (2x10^(-6)-1x10^(-4) M). In a following stage, a flow injection analysis (FIA) system with amperometric detection with wall-jet type cells operated at -0.1 V fixed-potential was implement...
12
artículo
The present work was centred on the study of potassium ethylxanthate, EtX-K+, which displays a remarkable selectivity and is widely employed in the treatment of sulphide ore. It was synthesised in our laboratory and its characterisation was performed, alongside with purity assessment, by analytical assays (IR,UV) as well as by decomposition studies. In particular, we aimed to develop the polarography procedure: DC(tast) method coupled with a modern dropping mercury electrode. (SMDE) for the determination of EtX-K+, enabled us to obtain defined and reproducible anodic waves. The investigation was carried out in the presence of NaOH as a supporting electrolyte at pH 12.6 within a broad concentration range (2x10^(-6)-1x10^(-4) M). In a following stage, a flow injection analysis (FIA) system with amperometric detection with wall-jet type cells operated at -0.1 V fixed-potential was implement...
13
artículo
In this research, the objective was to describe the perceptions that university students manifest of their formative process when moving from a face-to-face modality to a virtual one in the time of the SARS-CoV2 pandemic. The object of study was constructed from a sociological perspective that associated objective conditions and the corresponding production of subjectivities. Methodologically, three moments were recovered: 1) determination of social and technological capital; 2) construction of social classes from the determination of the volume and structure of capital; and 3) detection of student perceptions. The results (Cronbach's alpha of 0.913) establish that the lower the volume and structure of the students, the lower the academic performance, the less proclivity to an online work, the greater the need for academic accompaniment and the lower the institutional follow-up. By way o...
14
tesis de maestría
Amostras de poluentes particulados foram irradiadas con nêutroes têrmico e analizados por espectometria de raios gama. Descreve~se os dois métodos experimentais usados para determinação desses poluentes, sendo que ambos os métodos de analise, foram nao destrutivos. No primeiro método se irradiaram amostras no Reator Argonauta do Instituto de Engenharia Nuclear, e foram realizadas medidas absolutas das atividades induzidas. Os resultados indicaram a presenca de bromo, sodio e cloro em concentrações acima dos limites de determinação quantitativa. Na descrição do método se faz um exame geral das interferencias, e da sensibilidade do método assim como também da precisão dos resultados obtidos o segundo método foi o método comparativo de analise, tendo sido as amostras irradiadas do Reactor Pulstar da North Carolina State University, num fluxo medio de 5 x 10(12) n/cm2 s. F...
15
tesis de grado
El presente estudio tuvo como finalidad cuantificar los niveles de plomo, cadmio y arsénico en la especia en polvo de Cuminum cyminum (comino) expendidos en el Mercado Huamantanga-Puente Piedra, durante el periodo febrero 2022. El diseño del trabajo de investigación fue descriptiva, prospectivo y transversal. La muestra fue recolectada en el Mercado de Huamantanga-Puente Piedra de un total de 10 puestos; luego la muestra fue llevada para el análisis de los metales pesados al laboratorio LABICER de la Universidad Nacional de Ingeniería. Para la determinación de los metales pesados en polvo de Cuminum cyminum (comino), se recurrió a la técnica de la Espectrofotometría de Absorción Atómica. Las concentraciones de metales pesados hallados en polvo de Cuminum cyminum (comino) fueron: plomo menor a 0.64 ppm, cadmio menor a 0.03 ppm y arsénico menor a 2.46 ppm.
16
artículo
Two of the main indices used when doing a psychometric analysis of a performance test are the index of difficulty and the index of discrimination. These indices become indicators of the quality of a test as long as they are within acceptable ranges. This has two consequences, first the determination of the formula for the calculation of the indices, and secondly, the interpretation of them according to certain standards. This work shows the way how these indices are determined and related, as well as the way in which the discrimination rule influences the valuation of the test. Recommendations are also proposed for the use of both indices based on the analysis performed.
17
artículo
Two of the main indices used when doing a psychometric analysis of a performance test are the index of difficulty and the index of discrimination. These indices become indicators of the quality of a test as long as they are within acceptable ranges. This has two consequences, first the determination of the formula for the calculation of the indices, and secondly, the interpretation of them according to certain standards. This work shows the way how these indices are determined and related, as well as the way in which the discrimination rule influences the valuation of the test. Recommendations are also proposed for the use of both indices based on the analysis performed.
18
artículo
Two of the main indices used when doing a psychometric analysis of a performance test are the index of difficulty and the index of discrimination. These indices become indicators of the quality of a test as long as they are within acceptable ranges. This has two consequences, first the determination of the formula for the calculation of the indices, and secondly, the interpretation of them according to certain standards. This work shows the way how these indices are determined and related, as well as the way in which the discrimination rule influences the valuation of the test. Recommendations are also proposed for the use of both indices based on the analysis performed.
19
tesis doctoral
Peru's business community is comprised of 99.50% micro, small, and medium sized enterprises, which are the main source of employment for the population, but their wealth generation and contribution to the Gross Domestic Product (GDP) is limited to only 20.70%. The objective of this doctoral thesis is to demonstrate whether the sales of Peruvian MSMEs are determined by the number of establishments registered as Natural Persons with Businesses, belonging to the period 2019-2022. Motivated by this purpose, the values of the variables during the four aforementioned years are analyzed. Therefore, this research is quantitative and, at the same time, correlational, because it studies the correlation between variables. The data are taken without any modification, so the research design is non-experimental. It is concluded that MSME sales are not associated with the number of companies organized ...
20
artículo
The percentage of saccharose apparent "POL" is an important variable for the determination of sugar production, and its value differs among the cultivars, plant parts and growth seasons. The study aimed to compare values of POL and estimate productive potential of sugar in juice extracted from nodes and internodes of the sugarcane cultivars sugar during the 2010/2011 crop season. We used the experimental design of randomized blocks in factorial scheme 3x2x6, with four replications. The main treatments were cultivars of sugarcane, the secondary treatments two parts of the stalks of sugarcane, and third the seasons of analysis distributed over the harvest. The cultivars RB72454 and SP81-3250 showed the highest values POL. Conversely, the RB867515 obtained less satisfactory results, showing lower value of POL throughout the study period, and the two parts of the stalk. The internode was gre...