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1
artículo
We present a first approach to a new method to compute the motion estimation in digital videos using the two-dimensional instantaneous frequency information computed using amplitude-modulation frequency-modulation (AM-FM) methods. The optical flow vectors are computed using an iteratively reweighted norm for total variation (IRN-TV) algorithm. We compare the proposed method using synthetic videos versus a previous three-dimensional AM-FM based method and available motion estimation methods such as a phase-based, Horn-Schunck and the Lucas-Kanade methods. The results are promising producing a full density estimation with more accurate results than the other methods.
2
tesis de maestría
Image restoration consists in recovering a high quality image estimate based only on observations. This is considered an ill-posed inverse problem, which implies non-unique unstable solutions. Regularization methods allow the introduction of constraints in such problems and assure a stable and unique solution. One of these methods is Total Variation, which has been broadly applied in signal processing tasks such as image denoising, image deconvolution, and image inpainting for multiple noise scenarios. Total Variation features a regularization parameter which defines the solution regularization impact, a crucial step towards its high quality level. Therefore, an optimal selection of the regularization parameter is required. Furthermore, while the classic Total Variation applies its constraint to the entire image, there are multiple scenarios in which this approach is not the most adequat...
3
tesis de maestría
Image restoration consists in recovering a high quality image estimate based only on observations. This is considered an ill-posed inverse problem, which implies non-unique unstable solutions. Regularization methods allow the introduction of constraints in such problems and assure a stable and unique solution. One of these methods is Total Variation, which has been broadly applied in signal processing tasks such as image denoising, image deconvolution, and image inpainting for multiple noise scenarios. Total Variation features a regularization parameter which defines the solution regularization impact, a crucial step towards its high quality level. Therefore, an optimal selection of the regularization parameter is required. Furthermore, while the classic Total Variation applies its constraint to the entire image, there are multiple scenarios in which this approach is not the most adequat...
4
artículo
The aim of this research was to determine the content of total phenolic compounds (CFT), flavonoids (F), betalamic pigments (PB) and antioxidant capacity of quinoa grains (Chenopodium quinoa W.), after washing, drying and cooking process. Two varieties of quinoa (Pasankalla and Black Collana) were evaluated, which were provided by the Regional Department of Agriculture of Cajamarca, Peru. The initial content of CFT, F and PB was higher in the Black Collana variety than in the Pasankalla variety and the behavior was similar after all the processing stages, with the exception of the antioxidant capacity, which increased after drying and cooking process. PB, of the two varieties of quinoa under study, were degraded and diffused in the water of cooking following first order kinetics. Although there were significant losses of CFT, F and PB (p<0.05) after cooking process, the two varieties ...
5
artículo
Attenuation imaging using spectral techniques such as the spectral log difference (SLD) method suffers from a severe trade-off between spatial resolution and estimation variance. Recently, the regularized spectral log difference (RSLD) method was proposed as a technique that extends such trade-off by incorporating spatial priors (i.e., total variation) in the inversion process. However, the reduction of the variance of attenuation images could also be accomplished by post-processing of the attenuation maps using noise reduction techniques. The main goal of this study is to determine which strategy (i.e., noise handling during or after the attenuation image reconstruction) provides attenuation maps of better quality, both with synthetic data and experimental data obtained from calibrated physical phantoms. The results suggest that the noise rejection mechanism of RSLD significantly outper...
6
artículo
The aim of this review was to systematically explore the scientific evidence of the immunological changes associated with anesthesia in clinically healthy canines, whether or not they underwent surgical procedures, in order to provide information of interest about tools, protocols and processes that allow patients to veterinary anesthesiologists take an additional point of view in patient care. From the PRISMA methodology, an initial search process was carried out on the OVID®, SciELO Citation Index® and Redalyc® search platforms. Based on a research question, a search for relevant titles was carried out, considering only original articles and case reports published in indexed journals and under peer review processes. Subsequently, the reference lists of the definitive articles were searched for additional information (snowballing). Four articles were considered for the presentation o...
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artículo
The aim of this review was to systematically explore the scientific evidence of the immunological changes associated with anesthesia in clinically healthy canines, whether or not they underwent surgical procedures, in order to provide information of interest about tools, protocols and processes that allow patients to veterinary anesthesiologists take an additional point of view in patient care. From the PRISMA methodology, an initial search process was carried out on the OVID®, SciELO Citation Index® and Redalyc® search platforms. Based on a research question, a search for relevant titles was carried out, considering only original articles and case reports published in indexed journals and under peer review processes. Subsequently, the reference lists of the definitive articles were searched for additional information (snowballing). Four articles were considered for the presentation o...
8
artículo
This study was conducted in the Crustacean Sector of the Aquaculture Center (CAUNESP) at the São Paulo State University, Jaboticabal (21 ° 15’22”S and 48 ° 18’48”W) São Paulo, Brazil, from December 2003 to May 2004. The aim was to examine the water quality parameters of importance to freshwater prawn culture, operated in a semi-intensive system in Amazon River. Nine 0.01-ha earthen ponds were stocked with 20 juveniles.m -2 . Prawns were fed commercial diet at a rate of 7 to 9% of biomass until the 14th week. After 145 days of stocking, all ponds were drained and harvested. The following water parameters were determined weekly: dissolved oxygen, oxygen biochemical demand, pH, total alkalinity, electrical conductivity, suspended total solids and turbidity, N-nitrate, N-nitrite, N-nitrogen ammonia, N- total, soluble ortophosphate, total phosphorus, chlorophyll and pheophytin. In...
9
artículo
This study was conducted in the Crustacean Sector of the Aquaculture Center (CAUNESP) at the São Paulo State University, Jaboticabal (21 ° 15’22”S and 48 ° 18’48”W) São Paulo, Brazil, from December 2003 to May 2004. The aim was to examine the water quality parameters of importance to freshwater prawn culture, operated in a semi-intensive system in Amazon River. Nine 0.01-ha earthen ponds were stocked with 20 juveniles.m -2 . Prawns were fed commercial diet at a rate of 7 to 9% of biomass until the 14th week. After 145 days of stocking, all ponds were drained and harvested. The following water parameters were determined weekly: dissolved oxygen, oxygen biochemical demand, pH, total alkalinity, electrical conductivity, suspended total solids and turbidity, N-nitrate, N-nitrite, N-nitrogen ammonia, N- total, soluble ortophosphate, total phosphorus, chlorophyll and pheophytin. In...
10
artículo
The purpose of this study is to know the composition of the fractions of distillates wort for the production of Pisco, two of the main grape varieties for their manufacture: Torontel and broken. The analysis was performed by the method of gas chromatography to follow the standard technique for the analysis of Peruvian Pisco. We analyzed 24 of distillate fractions obtained from two grape must Torontel and shakes, obtained by natural fermentation.The grape shakes presents a greater concentration of higher alcohols that must of torontel, but lesser amount of esters that the latter. The analysis on samples from both distillations, show a decrease in the concentration of higher alcohols and esters passes under the process of distillation, while the concentrations of acetaldehyde and methanol remained virtually constant. Considering the total volume of each fraction analyzed, all components di...
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artículo
The application of edible coatings obtainable from alternative biodegradable materials has gained attention as a promising treatment to prolong the shelf-life of fresh-cut vegetables. Thus, this work aimed to develop a biodegradable coating based on fruit and vegetable residues flour. Immersion coating strategy was studied on the quality of minimally fresh-cut carrots during refrigeration storage by means of weight loss, color variation, pH, titratable acidity and soluble solids content. Better performance was obtained for coated carrots, which exhibited a tendency to have lower whiteness index than uncoated counterparts and enhanced overall quality. Despite a drop in color saturation expressed by chroma values (varying from 59 to 46) was observed, color index presented a positive value for all samples (varying from 13 to 15) indicating orange color preservation throughout storage. Altho...
12
artículo
The application of edible coatings obtainable from alternative biodegradable materials has gained attention as a promising treatment to prolong the shelf-life of fresh-cut vegetables. Thus, this work aimed to develop a biodegradable coating based on fruit and vegetable residues flour. Immersion coating strategy was studied on the quality of minimally fresh-cut carrots during refrigeration storage by means of weight loss, color variation, pH, titratable acidity and soluble solids content. Better performance was obtained for coated carrots, which exhibited a tendency to have lower whiteness index than uncoated counterparts and enhanced overall quality. Despite a drop in color saturation expressed by chroma values (varying from 59 to 46) was observed, color index presented a positive value for all samples (varying from 13 to 15) indicating orange color preservation throughout storage. Altho...
13
tesis de grado
Antecedentes: El odontólogo general se centra en el diagnóstico definitivo y por tanto utiliza radiografías panorámicas como método auxiliar para examinar y planificar tratamientos. Este tipo de evaluación imagenológica es crucial para identificar alteraciones y procesos patológicos. La técnica panorámica, tanto convencional como digital, ofrece ventajas como baja exposición a la radiación, rapidez y amplia cobertura anatómica. Es útil en exámenes rutinarios de pacientes edéntulos y detecta hallazgos incidentales como fragmentos radiculares, dientes retenidos, lesiones radiolúcidas, entre otros. Objetivo: Evaluar los hallazgos en radiografías panorámicas de pacientes edéntulos que buscan prótesis total en el Centro Dental Docente de la Facultad de Estomatología de la Universidad Peruana Cayetano Heredia en el periodo 2022-2023. Material y métodos: se realizó un es...
14
tesis de grado
El objetivo general de esta investigación fue estimar una evaluación comparativa del costo, precisión y tiempo entre el levantamiento topográfico con RPAS y el levantamiento con Estación Total en la APV José Carlos Mariátegui del distrito de Oropesa, Quispicanchis, Cusco - 2023. La metodología utilizada fue de enfoque experimental y de nivel descriptivo utilizando una población que corresponde al distrito de Quispicanchis de la ciudad del Cusco y una muestra centrada en el centro poblado de Oropesa, los instrumentos utilizados fueron una estación total con trípode, jalones con prismas, radios de comunicación, drones voladores, GPS y el software de procesamiento conocido como Civil 3D, ArcGis y Pix4D Enterprise. Los resultados de la investigación se centraron en obtener que la diferencia entre los levantamientos con RPAS y estación total fue de S/. 20.10, aunque la diferenci...
15
tesis de maestría
La presente investigación tuvo como objetivo conocer la variación del nivel de efectividad bajo el modelo Deming en un proceso de mantenimiento de una empresa minera en la Región Cajamarca, 2020. La unidad de estudio estuvo conformada por el proceso de mantenimiento de mandos finales de la flota de tractores de marca Caterpillar modelo D11R de una empresa minera, la técnica que se utilizó para la recolección de datos fue la observación directa y análisis documental, la cual contó con el instrumento registro para la variable individual efectividad. El estudio se apoyó en el enfoque cuantitativo, de diseño no experimental, transversal, descriptivo. Obteniendo como resultado que la efectividad sufre incrementos en cada una de las tres vueltas del ciclo Deming en 3.6%, 5.7% y 34.6% respectivamente. Se concluyó que la variación del nivel de efectividad bajo el modelo Deming en un...
16
tesis de grado
Se realizo un estudio prospectivo y cuasi experimental para determinar si el uso de la Técnica de Colgajo Mixto proporcionaría mejores resultados generales (dolor, reacción inflamatoria, apertura bucal) y locales (profundidad del surco gingival, recesión gingival y cicatrización) en exodoncia de terceros molares inferiores retenidos frente a la Técnica de Colgajo habitual que es a Espesor Total. La Técnica de Colgajo Mixto es presentado con el objetivo de minimizar la injuria realizada en el tejido adyacente a la zona operatoria. Junto a los resultados y descripción de la técnica se discute la literatura concerniente al papel del periostio en los procesos cicatrizales, así como las secuelas de la elevación de colgajos a Espesor Total sobre el tejido adyacente. Los resultados mostraron que la variación del edema, la intensidad del dolor y la variación de la limitación en la ...
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artículo
En la bahía de Huarmey se desarrollan las actividades: industrial, pesquera artesanal y minera, por ello Imarpe realizó una caracterización física, química y biológica de las masas de agua que entran en la bahía y que luego, se mezclan con las aguas continentales y antropogénicas. El objetivo del estudio fue detectar la calidad del ambiente marino y costero de la bahía, para conocer el impacto del estado ambiental en el mar costero y evaluar los efectos de la contaminación en el ecosistema marino del 2015 al 2019. Esta bahía, se caracteriza por ser abierta, al centro se encuentra la isla Corcovado y al norte la isla Manache. Mayores profundidades se hallaron en el extremo sur y menores en el borde costero. En el ecosistema marino, se localizaron valores termohalinos de aguas costeras frías superficiales (acf) y aguas superficiales subtropicales (ASS) con ligeras influencias d...
18
tesis de grado
El presente trabajo tuvo como objetivo incrementar la utilidad de una empresa de servicios tecnológicos B2B mediante la implementación integrada de Business Process Management (BPM) y el ciclo PDCA bajo el enfoque Lean Service. Para ello se desarrolló una investigación aplicada con estudio de caso, que permitió identificar los factores que originaban una baja utilidad, entre ellos: la deficiente gestión del servicio postventa, la deficiente gestión de ventas y el incremento de costos operativos. En función a dicho diagnóstico, se diseñó e implementó una metodología basada en BPM y PDCA, bajo el enfoque Lean service, orientada a la estandarización de procesos críticos, la reducción de tiempos operativos y la eliminación de reprocesos. Los resultados demostraron una mejora significativa en los indicadores vinculados a las causas principales. La utilidad anual pasó de S/ 1...
19
tesis de grado
La presente investigación tiene como objetivo general mejorar en el proceso de desalado de la alcachofa conservada, para mantener la calidad e incrementar el rendimiento en la planta salsas de la empresa Virú S.A”. En primer lugar, se efectuó un diagnóstico situacional de la empresa para identificar los problemas existentes usando este fin el Diagrama Ishikawa; donde luego se exponen las diferentes causas raíz que inciden en dichos problemas. Se empleó la tecnología de los métodos de estadística de calidad observando la variación de parámetros de tiempos, temperatura, pH y porcentaje de sal en la alcachofa desalada que permitan mantener y garantizar las propiedades organolépticas en el producto final para asegurar su estabilidad y calidad .Se empleó la técnica de blanqueado a una temperatura de 75°C a 80°C por un tiempo de 3 a 7 minutos lográndose acelerar el tiempo de...
20
tesis de grado
El presente estudio trata del diseño de una zaranda separadora regulable, la cual tiene propiedades que ayudan a agilizar el proceso de selección del maíz, convirtiendo en un proceso flexible la selección de materia prima, con este equipo se podrá elegir la granulometría deseada del producto de una manera fácil y rápida, haciendo uso de equipos eléctricos y electrónicos, controlado mediante un PLC con una interfaz gráfica, mediante programación, el aspecto mecánico común de una zaranda vibratoria sumado al control de movimiento de las mallas perforadas superpuestas logran la variación del diámetro de selección del maíz, además del control de velocidad de los motovibradores que tendrán un efecto en la fuerza ejercida sobre la bandeja móvil, la cual determina la cantidad de polvo extraído por el equipo. Son importantes los cálculos de resistencia del equipo, así com...