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1
artículo
Publicado 2023
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Mining tailings are the main source of contamination of water resources due to the presence of heavy metals, which impact ecological systems and human health; Therefore, the implementation of innovative techniques that help mitigate the impact generated by these pollutants, such as lead, is urgently needed; Hence, the objective of this research was to evaluate the selective removal capacity of lead present in mining tailings using nanodendimers of humus, compost, humic acids and pure fulvic acids. A system of humus, compost, humic acids and fulvic acids was implemented to filter a solution of 200 ppm of lead obtained from a sample of mining tailings from the Samne area (La Libertad Region, Peru) that contained 3399 ppm of lead. lead. Then, the concentration of Pb in the filtrate of each system was determined using the atomic absorption spectrophotometry technique. Through this analysis, ...
2
artículo
Chankillo is an archaeological site with ceremonial, administrative and defensive aspects which also has a the oldest of America, 2400-year-old solar observatory. The geomorphology of the area occupied Chankillo consists of the following units: chains of hills, streams, reservoirs and valley wind. In terms of regional geology, the main unit is the Tonalita Huaricanga II Lower Cretaceous, which has been intruded by processes, granite dykes, pegmatites and later andesite dikes.The main rocks used in construction were Chankillo tonalite; to a lesser extent granite and others. Their sources are mainly around the site. Several methods of exploitation was used for rock blocks, including in situ extraction wells, trenches, cut slope, and even pick up loose material. To remove the rocks, fracturing his hitting them naturally hard hammers and chisels and resistant rock preyed mainly andesitic vol...
3
artículo
The diagnostic and treatment of the pieces held its necessary, to avoid later complications that could endanger the dental arc integrity. Therefore we are planning a multidisciplinary work that will include an early evaluation of the piece until the are will be in perfect line up using the Odontopediatrics and Surgery services (as a first stage). The traction orthodontic with removing devices; later to the surgery exposition could be unique or propose like the first part of the treatment more complex in agreement with the necessity of each patient. In this article we propose a short theory and the proposal of one clinic case of patient who arrived to the service of the Faculty in 2002.
4
artículo
The diagnostic and treatment of the pieces held its necessary, to avoid later complications that could endanger the dental arc integrity. Therefore we are planning a multidisciplinary work that will include an early evaluation of the piece until the are will be in perfect line up using the Odontopediatrics and Surgery services (as a first stage). The traction orthodontic with removing devices; later to the surgery exposition could be unique or propose like the first part of the treatment more complex in agreement with the necessity of each patient. In this article we propose a short theory and the proposal of one clinic case of patient who arrived to the service of the Faculty in 2002.
5
tesis de grado
En la actualidad, la restauración de imágenes submarinas sigue siendo un tópico complejo en el ámbito de la imagenología óptica subacuática. Esto se debe a que los efectos atmosféricos y de reflectividad producidos por la escena suelen generar una degradación significativa a la fotografía y limitar el rango capturado debido a la borrosidad producida en el ambiente. Con la finalidad de solucionar este problema, la siguiente tesis implementa un algoritmo de retrodispersión que busca eliminar el efecto de degradación generado por el agua. Este proceso utilizara una imagen extraída de una cámara RGB y un mapa de profundidad extraído por software de fotogrametría como puntos de entrada. Sin embargo, dada la complejidad computacional que involucra ejecutar, el tiempo de ejecución aumenta exponencialmente, especialmente para imágenes de alta resolución y matrices generados de...
6
tesis de maestría
In this study, we address a fundamental and still relatively less explored aspect in the field of neural networks for image dehazing: the unsupervised dehazing of an image. By conceiving a hazy image as the superposition of several “simpler“ layers, such as a haze-free image layer, a transmission map layer, and an atmospheric light layer, inspired by the atmospheric scattering model, we propose an approach based on the concept of layer disentangling. Our method, called XYZ, represents a substantial improvement in image quality metrics, such as SSIM and PSNR as well as BRISQUE, PIQE and NIQE. This advancement is achieved through the strategic combination of the XHOT, YOLY and ZID methods, capitalizing on the individual strengths of each. A distinctive and valuable aspect of the XYZ approach is its unsupervised nature, which implies that it does not rely on data sets containing pairs o...
7
artículo
Publicado 2020
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The aim of this study was to evaluate the effect of a parenteral treatment with vitamins and minerals on the percentage of pregnancy in heifers after a fixed-time artificial insemination (FTAI) scheme as well as to determine possible relationships between the response to the treatment and the Reproductive Tract Score (RTS). A total of 360 heifers from three farms were used (A, B and C). On day 0, the animals were divided into two groups according to their RTS. A group was supplemented via i.m. with a commercial vitamin-mineral complex (V+M Group) and the other one remained as a control group. Simultaneously, an intravaginal device with 0.5 g of progesterone was placed and 2 mg of estradiol benzoate was injected. On day 7, the device was removed and 500 µg of D(+) cloprostenol and 1 mg of estradiol cypionate were injected. The FTAI was performed between 48 and 56 h after the device was r...
8
artículo
Publicado 2020
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The aim of this study was to evaluate the effect of a parenteral treatment with vitamins and minerals on the percentage of pregnancy in heifers after a fixed-time artificial insemination (FTAI) scheme as well as to determine possible relationships between the response to the treatment and the Reproductive Tract Score (RTS). A total of 360 heifers from three farms were used (A, B and C). On day 0, the animals were divided into two groups according to their RTS. A group was supplemented via i.m. with a commercial vitamin-mineral complex (V+M Group) and the other one remained as a control group. Simultaneously, an intravaginal device with 0.5 g of progesterone was placed and 2 mg of estradiol benzoate was injected. On day 7, the device was removed and 500 µg of D(+) cloprostenol and 1 mg of estradiol cypionate were injected. The FTAI was performed between 48 and 56 h after the device was r...
9
artículo
Publicado 2019
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The odontoma is a benign tumor that comes from an alteration of differentiated epithelial and mesenchymal odontogenic cells capable of forming enamel, dentin and cement. The etiology is unknown, but it has been associated with infections, inherited abnormalities, odontoblastic hyperactivity and trauma. To small or average odontoma size, the acceptable treatment is tumor exeresis. The problem arises with large odontomas, whose removal involves the sacrifice of large amounts of bone, the potential for mandibular fracture and damage to the inferior alveolar nerve. To avoid these treatment complications, Rittersma and Van Gool introduced in 1979 the use of the sagittal-cut osteotomy technique of mandibular ramus. We report the case of a 37-year-old male patient, with no contributory systemic history, who presented increased volume of left side face associated with pain and purulent secretion...
10
artículo
Publicado 2019
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The odontoma is a benign tumor that comes from an alteration of differentiated epithelial and mesenchymal odontogenic cells capable of forming enamel, dentin and cement. The etiology is unknown, but it has been associated with infections, inherited abnormalities, odontoblastic hyperactivity and trauma. To small or average odontoma size, the acceptable treatment is tumor exeresis. The problem arises with large odontomas, whose removal involves the sacrifice of large amounts of bone, the potential for mandibular fracture and damage to the inferior alveolar nerve. To avoid these treatment complications, Rittersma and Van Gool introduced in 1979 the use of the sagittal-cut osteotomy technique of mandibular ramus. We report the case of a 37-year-old male patient, with no contributory systemic history, who presented increased volume of left side face associated with pain and purulent secretion...
11
artículo
Publicado 2021
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Introduction: Bile duct stones constitutes 20% of symptomatic gallbladder disease and difficult stones are one third of this. Endoscopic papillary large balloon dilation (EPLBD) with or without prior endoscopic sphincterotomy (EST) produces excellent outcomes for the treatment of complex or difficult common bile duct (CBD) stones, alone or combined with previous therapeutic options as mechanical lithotripsy (ML) and temporary or definitive stenting. Objectives: Show success rate, complications and adverse events. Show that higher success rates are obtained combining ERCP techniques with no increase in complications. Materials and methods: We evaluated the safety and therapeutic outcomes of EPLBD with vs. without EST and other combinations for the removal of difficult bile duct stones. We described our procedures for a decade and compare them with the previous decade without balloo...
12
artículo
Publicado 2003
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Calixarenes are condensation products of phenols to substituted and formaldehyde in an alkaline medium 1. In this work, the extraction is carried out from an aqueous phase to an organic phase through the formation of complexes of sodium metal and potassium with the macrocyclic ligand calixarene p- tbutilcalix [4 ] arene tetraetanoato acetate ( L ) dissolved in chloroform the pH of 5, 7.5 and 8.5 . The absorbance of the alkali metal picrates ( - , K + Pi - , Na + Pi Pi - = 2,4,6 trinitrophenol ) was measured , and the complexes formed L M + , Pi -org organic phase at 310 nm . Experiments show that the extraction calixarene ( L ) ligand extracted at pH 7.5 to 72.3% sodium ion (I) in an aqueous solution of 2 to 20 ppm of concentration and extraction 35.6 % for potassium ion (I ) under the same conditions.
13
artículo
Publicado 2003
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Calixarenes are condensation products of phenols to substituted and formaldehyde in an alkaline medium 1. In this work, the extraction is carried out from an aqueous phase to an organic phase through the formation of complexes of sodium metal and potassium with the macrocyclic ligand calixarene p- tbutilcalix [4 ] arene tetraetanoato acetate ( L ) dissolved in chloroform the pH of 5, 7.5 and 8.5 . The absorbance of the alkali metal picrates ( - , K + Pi - , Na + Pi Pi - = 2,4,6 trinitrophenol ) was measured , and the complexes formed L M + , Pi -org organic phase at 310 nm . Experiments show that the extraction calixarene ( L ) ligand extracted at pH 7.5 to 72.3% sodium ion (I) in an aqueous solution of 2 to 20 ppm of concentration and extraction 35.6 % for potassium ion (I ) under the same conditions.
14
artículo
Publicado 2018
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Currently, with the excessive increase in the amount of digital information, whether text, audio, video or images and the acceleration of technology, it is very easy to make some alterations in this type of data that can be visible or not. These alterations may have different objectives, such as introducing a watermark to protect the copyright, or to enter a hidden message to be sent in secret, also alterations to add or remove any information for alter the original information for any purpose, whether good or bad. Faced with all these different possibilities of alterations that often cannot be detected by a simple visual examination; that is why it is necessary to develop and implement automated methods that allow us to identify when a data is altered. In this paper we focus only on the detection of altered or manipulated images.
15
artículo
Chankillo es un sitio arqueológico con aspectos ceremoniales, administrativos y defensivos que posee además un observatorio solar, el más antiguo de América, con 2400 años de antigüedad. La geomorfología del área que ocupa Chankillo está conformada por las siguientes unidades: cadenas de cerros, quebradas, depósitos eólicos y valle. En cuanto a la geología regional, la principal unidad es la Tonalita Huaricanga II del Cretáceo Inferior, que ha sido intruida por apófisis, diques de granito, pegmatitas y posteriormente por diques de andesita.Las principales rocas usadas en la construcción de Chankillo fueron la tonalita; en menor grado el granito y otras. Sus fuentes mayoritariamente se encuentran en los alrededores del sitio. Se empleó varios métodos de explotación para conseguir los bloques de roca, entre ellos extracción in situ, pozos, trincheras, corte en ladera, e ...
16
Publicado 2024
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Introducción: Los alineadores se comercializaron como una alternativa a los aparatos fijos tradicionales. Con el tiempo, la gama de casos que se pueden tratar mediante alineadores invisibles se ha ampliado. Aún no hay consenso en cuanto a la previsibilidad del movimiento con alineadores y cómo la distribución de fuerzas transmitidas desde los alineadores a la superficie del diente se ven afectadas por la geometría y la extensión de la línea de corte, se han realizado pocos estudios para investigar la capacidad efectiva de los alineadores para lograr movimientos complejos. Objetivo: Evaluar la predictibilidad de los movimientos ortodónticos dentarios con alineadores transparentes con diferentes diseños de corte a nivel gingival, de pacientes atendidos en el servicio de Ortodoncia y Ortopedia maxilar del Centro Dental Docente Cayetano Heredia en el periodo 2024 - 2025. Materiales ...
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18
tesis de grado
Publicado 2020
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En el presente trabajo se desarrolló un aplicativo con ayuda del software MATLAB para acompañar en las fases de diseño y mantenimiento de la implementación de proyectos de humedales artificiales de flujo superficial. Dicho aplicativo se encuentra de manera libre para su descarga con el nombre HumePUCP en el siguiente link: https://bit.ly/3k2hOs7 . El trabajo de tesis propone un primer acercamiento para un diseño optimizado de humedales artificiales en función a la literatura existente. Por un lado, existen diversos autores que proponen distintas ecuaciones de diseño en función al área superficial. Dichas ecuaciones tienen constantes de diseño típicos que, debido a su naturaleza, no proporcionan diseños adecuados ya que las condiciones bajo las cuales estas se formularon varían de acuerdo a las condiciones locales de cada estudio. Esto, finalmente se traduce en sobredimension...
19
tesis de grado
Publicado 2020
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En el presente trabajo se desarrolló un aplicativo con ayuda del software MATLAB para acompañar en las fases de diseño y mantenimiento de la implementación de proyectos de humedales artificiales de flujo superficial. Dicho aplicativo se encuentra de manera libre para su descarga con el nombre HumePUCP en el siguiente link: https://bit.ly/3k2hOs7 . El trabajo de tesis propone un primer acercamiento para un diseño optimizado de humedales artificiales en función a la literatura existente. Por un lado, existen diversos autores que proponen distintas ecuaciones de diseño en función al área superficial. Dichas ecuaciones tienen constantes de diseño típicos que, debido a su naturaleza, no proporcionan diseños adecuados ya que las condiciones bajo las cuales estas se formularon varían de acuerdo a las condiciones locales de cada estudio. Esto, finalmente se traduce en sobredimension...
20
artículo
Publicado 2015
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The study’s aim was to obtain evidence of validity of the Learning Self-Regulation Questionnaire (LSRQ) internal structure and to verify metric invariance compared with a previous research study. The participants were 237 university students from the first three academic semesters of a private university in three Peruvian cities (two in the North of Peru, and one in Lima). The analysis was performed by a semi-confirmatory factor analysis, specifying as comparison matrix: a) the configuration derived from a previous study, and b) the free estimation loadings factors. The results indicate that two dimensions represent the instrument structure satisfactorily; but the metric invariance compared to a previous study was not satisfactory. The re-specification of the model, by removing two items with factorial complexity problems and the free estimation of the items, was successful. These resu...
