Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
a condiciones » las condiciones (Expander búsqueda), en condiciones (Expander búsqueda), de condiciones (Expander búsqueda)
composites a » composites _ (Expander búsqueda), composite _ (Expander búsqueda), compositos de (Expander búsqueda)
a condiciones » las condiciones (Expander búsqueda), en condiciones (Expander búsqueda), de condiciones (Expander búsqueda)
composites a » composites _ (Expander búsqueda), composite _ (Expander búsqueda), compositos de (Expander búsqueda)
1
artículo
Publicado 2024
Enlace
Enlace
Objective: This systematic review aimed to investigate the changes in the composition of the subgingival microbiota among subjects with normo-weight, overweight and obesity, in conditions of periodontal health and disease. Materials and Methods: The protocol for this study was designed following PRISMA guidelines. Records were identified using different search engines (PubMed/MedLine, Scopus and Web of Science). Observational studies, in human subjects diagnosed with obesity (BMI >30kg/m2) and periodontal disease (gingivitis and periodontitis), on the analysis of subgingival microbiota were selected. Eight articles were included. Results: The subgingival microbiota of 1,229 subjects (n=894 exposure group and n=335 control group) was analyzed. Periodontal pathogens were the most common bacteria detected in subjects with obesity and periodontitis (Porphyromonas gingivalis, Tannerella fo...
2
artículo
Publicado 2024
Enlace
Enlace
Compost piles were evaluated at different compositions to take advantage of household organic waste from the city of Puno in the period from June to September 2015. Three compost piles were evaluated at different composition and one cell vermiculture without worms, in order to determine what conditions produce an organic fertilizer higher quality, using organic waste Domiciliarios (ROD), Poda of Parks and Gardens of the city (PPJ) and sheep Dung (EGO), the three compost piles with a volume of 4.5 m3; P4 has 100% of 0.8 m3 ROD placed in a cell vermiculture and P5 has 100% ROD 2.6 m3 which was located on the outside of the plant. To accelerate decomposition, an infrastructure greenhouse conditions. After three months, three samples of P1, P2, P3 and P4 was removed and taken to the laboratory. The parameters were compared with the analysis of variance, the pile contains more Nitrogen, %Orga...
3
artículo
Publicado 2024
Enlace
Enlace
Compost piles were evaluated at different compositions to take advantage of household organic waste from the city of Puno in the period from June to September 2015. Three compost piles were evaluated at different composition and one cell vermiculture without worms, in order to determine what conditions produce an organic fertilizer higher quality, using organic waste Domiciliarios (ROD), Poda of Parks and Gardens of the city (PPJ) and sheep Dung (EGO), the three compost piles with a volume of 4.5 m3; P4 has 100% of 0.8 m3 ROD placed in a cell vermiculture and P5 has 100% ROD 2.6 m3 which was located on the outside of the plant. To accelerate decomposition, an infrastructure greenhouse conditions. After three months, three samples of P1, P2, P3 and P4 was removed and taken to the laboratory. The parameters were compared with the analysis of variance, the pile contains more Nitrogen, %Orga...
4
documento de trabajo
Publicado 2014
Enlace
Enlace
Este trabajo desarrolla un modelo económico-político de equilibrio general dinámico para el tamaño y la composición óptima del gasto público. Una solución analítica es derivada de la votación por mayoría para tres categorías de gasto público: bienes de consumo público y transferencias (valorados por las familias), como también servicios públicos productivos (complementando al capital privado en una tecnología de crecimiento endógeno). La desigualdad se refleja en una distribución discreta de agentes que viven innatamente y dieren por sus tenencias de capital inicial. En contraste a la literatura previa que deriva relaciones monótonas (típicamente negativas) entre desigualdad y crecimiento en ambientes con votación unidimensional, este trabajo establece las condiciones, en un entorno de votación multidimensional, en virtud del cual una relación no monótona, forma ...
5
artículo
Publicado 2019
Enlace
Enlace
The behavior of the composite steel deck is conditioned, mainly, to the interaction that exists between the concrete and the steel deck, the shear connection between these two materials is provided by the mechanical adherence, which exists in its interface. In order to study these characteristics, a series of full-scale slab tests have been carried out, such as bending tests to identify the slipping load, which is directly related to the shear bond strength of the slab. The study of the shear bond strength is very important because in most cases the geometric conditions of the section and the slenderness of the slab will lead to this type of failure. For this reason, this research will be in charge of studying this failure condition, based on previously full-scale slab tests and newly constructed specimens, in order to cover as many situations as possible. The experimental results of the...
6
artículo
Publicado 2022
Enlace
Enlace
The following study is for living knowledge about the chemical and nutritional content of maca and cañihua coming of the principal areas of production in our country, and for diffuseness of its nutritional value inside the population contributing to improve the level and quality of life of Peruvians.For this we took 25 samples of maca from the soils of Junín, Puno, Ancash y Cerro de Paseo. They were obtained at random from the cultivated fields. The circunstances of this work was when the crop of this species was carried out and taken to the regional markets.We proceed to the determination of the protein content by the method of Microkjeldhal, aminoacids content by liquid chromatography of high performance, fat, carbohydrates, ash, fiber, humidity determination according to Peruvian Thecnical norms and determination of mineral by spectrophotometric in atomic absortion.We obtained as co...
7
tesis de maestría
Publicado 2024
Enlace
Enlace
El emergente y exponencial crecimiento en el campo de las tecnologías avanzadas y "verdes" contribuye a un aumento global en la demanda de materias primas críticas de origen mineral, como lo son el manganeso y el cobalto. Los nódulos de manganeso han ganado reconocimiento recientemente como fuentes potenciales de estos elementos y otras materias críticas. Sin embargo, su presencia en los fondos marinos representa un dilema para los responsables políticos debido a su ubicación, con frecuencia más allá de las zonas económicas exclusivas de las naciones, y a las posibles amenazas de la minería submarina para los ecosistemas marinos abisales. La presente tesis tiene como objetivo realizar una caracterización estratigráfica, textural, mineralógica y composicional de los óxidos de Mn, incluidos los nódulos y concreciones, recubrimientos y venillas en la cuenca onshore de antearc...
8
tesis de maestría
Publicado 2016
Enlace
Enlace
La presente investigación tuvo como finalidad el estudio y la remoción de aminas con cadenas alifáticas, especialmente la dimetilamina (DMA), la cual, bajo ciertas condiciones que se dan durante el tratamiento de aguas potables y residuales pueden formar la N-nitrosodimetilamina (NDMA). La importancia de la disposición de DMA radica en el hecho de que una vez que se transforma en NDMA esta última es exponencialmente más nociva al mostrar cierta actividad carcinogénica incluso a concentraciones tan bajas como 0,7 ng.L-1. Los materiales adsorbentes desarrollados en este estudio constan de carbón activado (CA) preparado a partir de semilla de aguaje (Mauritia Flexuosa) por activación química con ácido fosfórico y posteriores modificaciones. Estas consiguen primero en introducir grupos sulfónicos (-SO3H) sobre su superficie formando el denominado carbón activado funcionalizado ...
9
tesis de maestría
Publicado 2016
Enlace
Enlace
Al Consejo Nacional de Ciencia, Tecnología e innovación Tecnológica por la subvención otorgada para realizar mis estudios de maestría, viaje de especialización al congreso de adsorción en Cartagena-Colombia y sobre todo por el soporte económico global para el desarrollo del presente trabajo de tesis en virtud del convenio de gestión PUCP-FONDECYT N°012-2013-FONDECYT. Al vicerrectorado de Investigación PUCP, por la oportunidad de permitirme trabajar en el proyecto DGI-2013-2016.
10
tesis de maestría
Publicado 2016
Enlace
Enlace
La presente investigación tuvo como finalidad el estudio y la remoción de aminas con cadenas alifáticas, especialmente la dimetilamina (DMA), la cual, bajo ciertas condiciones que se dan durante el tratamiento de aguas potables y residuales pueden formar la N-nitrosodimetilamina (NDMA). La importancia de la disposición de DMA radica en el hecho de que una vez que se transforma en NDMA esta última es exponencialmente más nociva al mostrar cierta actividad carcinogénica incluso a concentraciones tan bajas como 0,7 ng.L-1. Los materiales adsorbentes desarrollados en este estudio constan de carbón activado (CA) preparado a partir de semilla de aguaje (Mauritia Flexuosa) por activación química con ácido fosfórico y posteriores modificaciones. Estas consiguen primero en introducir grupos sulfónicos (-SO3H) sobre su superficie formando el denominado carbón activado funcionalizado ...
11
artículo
Publicado 2012
Enlace
Enlace
The aim of the present work was to optimize the sensorial and technological features of ice cream. The experimental work was performed in two stages: 1) optimization of lactose enzymatic hydrolysis, and 2) optimization of the process and product. For the first stage a complete factorial design was developed, optimized using both response surface and the steepest ascent method. In the second stage a mixture design was performed, combining the process variables. The product with the best sensorial acceptance, high yield and low cost was selected. The acceptance of the product was developed by an untrained taster’s panel. As a main result the sensorial and technological features of the final product were improved, establishing the optimum parameters for its elaboration.
12
artículo
Publicado 2012
Enlace
Enlace
The aim of the present work was to optimize the sensorial and technological features of ice cream. The experimental work was performed in two stages: 1) optimization of lactose enzymatic hydrolysis, and 2) optimization of the process and product. For the first stage a complete factorial design was developed, optimized using both response surface and the steepest ascent method. In the second stage a mixture design was performed, combining the process variables. The product with the best sensorial acceptance, high yield and low cost was selected. The acceptance of the product was developed by an untrained taster’s panel. As a main result the sensorial and technological features of the final product were improved, establishing the optimum parameters for its elaboration.
13
artículo
Publicado 2018
Enlace
Enlace
The objective of this study was to determine the optimal parameters of decolorization of crude oil to obtain a semi-refined fish oil of acceptable quality; response surface methodology was used, considering a central composite design with two factors: Vacuum pressure (0.13-0.7 bar) and drying temperature (96-124°C); having as dependent variables the percentage of free fatty acids (% AGL) and color of the oil. The raw material and the optimum finished product were characterized physico-chemically, which was obtained under the operating conditions: drying temperature of 110 ° C and 0.13 bar vacuum. The finished product indicated a percentage of free fatty acids of 0.27 ± 0.01% and CieLab colour with coordinates L: 48.69 ± 0.88, a: -4.28 ± 0.26 and b: 35.03 ± 0.85, which Is equivalent to color 6 -7 in Gardner scale, compliance with the industrial specifications.
14
artículo
Publicado 2018
Enlace
Enlace
The objective of this study was to determine the optimal parameters of decolorization of crude oil to obtain a semi-refined fish oil of acceptable quality; response surface methodology was used, considering a central composite design with two factors: Vacuum pressure (0.13-0.7 bar) and drying temperature (96-124°C); having as dependent variables the percentage of free fatty acids (% AGL) and color of the oil. The raw material and the optimum finished product were characterized physico-chemically, which was obtained under the operating conditions: drying temperature of 110 ° C and 0.13 bar vacuum. The finished product indicated a percentage of free fatty acids of 0.27 ± 0.01% and CieLab colour with coordinates L: 48.69 ± 0.88, a: -4.28 ± 0.26 and b: 35.03 ± 0.85, which Is equivalent to color 6 -7 in Gardner scale, compliance with the industrial specifications.
15
artículo
Publicado 2018
Enlace
Enlace
The objective of this study was to determine the optimal parameters of decolorization of crude oil to obtain a semi-refined fish oil of acceptable quality; response surface methodology was used, considering a central composite design with two factors: Vacuum pressure (0.13-0.7 bar) and drying temperature (96-124°C); having as dependent variables the percentage of free fatty acids (% AGL) and color of the oil. The raw material and the optimum finished product were characterized physico-chemically, which was obtained under the operating conditions: drying temperature of 110 ° C and 0.13 bar vacuum. The finished product indicated a percentage of free fatty acids of 0.27 ± 0.01% and CieLab colour with coordinates L: 48.69 ± 0.88, a: -4.28 ± 0.26 and b: 35.03 ± 0.85, which Is equivalent to color 6 -7 in Gardner scale, compliance with the industrial specifications.
16
artículo
Publicado 2018
Enlace
Enlace
The objective of this study was to determine the optimal parameters of decolorization of crude oil to obtain a semi-refined fish oil of acceptable quality; response surface methodology was used, considering a central composite design with two factors: Vacuum pressure (0.13-0.7 bar) and drying temperature (96-124°C); having as dependent variables the percentage of free fatty acids (% AGL) and color of the oil. The raw material and the optimum finished product were characterized physico-chemically, which was obtained under the operating conditions: drying temperature of 110 ° C and 0.13 bar vacuum. The finished product indicated a percentage of free fatty acids of 0.27 ± 0.01% and CieLab colour with coordinates L: 48.69 ± 0.88, a: -4.28 ± 0.26 and b: 35.03 ± 0.85, which Is equivalent to color 6 -7 in Gardner scale, compliance with the industrial specifications.
17
artículo
Publicado 2017
Enlace
Enlace
Microbial proteases are the most important group in the enzymes world market, because have several industrial applications. Moreover, they have some advantages respect to proteases produced by other sources, such as to have more stability and to be excreted to fermentation medium. The genus Pseudomonas has been studied as a protease producer of enzymes with industrial potential. Nevertheless, the production is affected by factors such as medium composition and culture conditions, and their optimization lead to reduce costs and increase yield. In this context, medium components that influenced significantly in production of Pseudomonas sp. M211 extracellular proteases in submerged fermentation were determined. In this work, one-factor-at-a-time method was used to assess the effect of different carbon, nitrogen and ions sources in proteases production. The highest level of extracellular pr...
18
tesis de grado
Publicado 2023
Enlace
Enlace
Los minerales pertenecientes al supergrupo de la turmalina son muy útiles para registrar las condiciones fisicoquímicas de su cristalización y rastrear los procesos geológicos asociados a la formación de depósitos minerales. Este estudio presenta nuevos resultados sobre la petrografía y geoquímica de turmalina en el distrito Triásico de Chacaltaya-Kellhuani-Milluni (oeste de Bolivia), ubicado en el segmento norte de la Cordillera Real dentro del Cinturón Estannífero de los Andes Centrales. El área de estudio se encuentra alrededor del stock granítico de Chacaltaya, aproximadamente 5 km al sur del granito de Huayna-Potosí. En este distrito, la mineralización hidrotermal está asociada a greisen, brechas y vetas. Se distinguen tres tipos principales de turmalina hidrotermal, de acuerdo a la petrografía: i) Tur-1, que presenta un color naranja y se manifiesta como cristales ...
19
tesis de grado
Publicado 2023
Enlace
Enlace
Los minerales pertenecientes al supergrupo de la turmalina son muy útiles para registrar las condiciones fisicoquímicas de su cristalización y rastrear los procesos geológicos asociados a la formación de depósitos minerales. Este estudio presenta nuevos resultados sobre la petrografía y geoquímica de turmalina en el distrito Triásico de Chacaltaya-Kellhuani-Milluni (oeste de Bolivia), ubicado en el segmento norte de la Cordillera Real dentro del Cinturón Estannífero de los Andes Centrales. El área de estudio se encuentra alrededor del stock granítico de Chacaltaya, aproximadamente 5 km al sur del granito de Huayna-Potosí. En este distrito, la mineralización hidrotermal está asociada a greisen, brechas y vetas. Se distinguen tres tipos principales de turmalina hidrotermal, de acuerdo a la petrografía: i) Tur-1, que presenta un color naranja y se manifiesta como cristales ...
20
artículo
Publicado 2025
Enlace
Enlace
Bulk-fill composite resins have emerged as a key innovation in restorative dentistry, offering an efficient and modern alternative for direct dental restorations. These resins allow for the placement of thicker layers, reducing clinical time. Among their main features are their adaptability, adequate depth of polymerization, and mechanical properties, which meet clinical requirements for functional and durable restorations. The clinical benefits of bulk-fill resins include reduced polymerization shrinkage stress and simplified handling, making them particularly useful for deep cavity restorations. However, despite these advantages, controversies have arisen regarding their long-term performance, such as color stability and wear resistance in areas of high occlusal load. This article reviews the fundamental characteristics of bulk-fill resins, their clinical benefits, and the controversie...
