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1
artículo
Publicado 2016
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In this study, waste hairs of the enzymatic unhairing process (PPE) of tannery were used as adsorbents to remove lead of a solution. Waste hairs were treated with acid hydrolysis and used in the type batch adsorption experiments, to be examined the effect of pH on the adsorption and also to investigate the mechanism of adsorption for which studies adsorption isotherms and the adsorption kinetics of Pb (II) were performed on treated hairs. The results showed that adsorption of Pb (II) was pH dependent with the optimum pH of 7. Isotherm studies showed that experimental data match the pattern of the Langmuir isotherm for the case of treated hairs of the enzymatic unhairing process (PTPE). The maximum adsorption capacity was 321.20 mg Pb (II)/g of bioadsobent (PTPE). The kinetic studies showed that the reaction model of pseudo-second order best describes the adsorption process. Finally, the ...
2
artículo
Publicado 2003
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This work compare the efficiency of water treatment from Rimac river. Samples from different phases of water treatment (decanted, filtered and chlorinated) were compared with not treated samples. Coliphages quantification was made by Simple Layer and Membrane Filter methods. Most Probable Number (NMP) and Membrane Filter methods were used to assessment of Total Coliforms, Coliforms Thermotolerants and Heterotrophic Bacteria. The standard strain of E. coli C ATCC 13706 was used as coliphages host. The averages of quantified coliphages were of 2267,25 UFP/100 mL in samples with out treatment; 2,11, 2,04 and 1,07 UFP/100 mL in the water samples from decanted, filtered and chlorinated treatment respectively. Total Coliforms and Coliforms Thermotolerants were not detected in samples of chlorinated water. The correlation between coliphages and Total Coliforms in samples of decanted and filtere...
3
artículo
Publicado 2020
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The response surface methodology was applied to evaluate the optimal experimental conditions to remove persistent organic compounds from a synthetic textile wastewater using a batch photochemical reactor on a laboratory scale. Four factors at three levels were studied: Fenton H2O2/Fe2+ reagent ratio (11,25, 18,75, 26,25 mg/L/mg/L), UV lamp power (4, 11, 18 W), pH (2, 3, 4) and treatment time (60, 120, 180 min). The optimum levels found for the four factors were: ratio of Fenton H2O2/Fe2+ reagents equal to 17 mg/L/mg/L, UV lamp power equal to 4 W, pH equal to 3 and treatment time of 180 min. It was found that the photo- Fenton process is very effective in treating synthetic textile wastewater, with a removal of 86 %, with respect to COD.
4
artículo
Publicado 2016
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This paper presents a study that aimed to determine the mechanism of a process for Cr(VI) removal from aqueous solutions, using compost of carnation crop residues as the adsorbent. We assessed whether the microbiota present in the absorbent material affected the removal of Cr(VI) using respirometric measurements and evaluating the removal capacity using sterilized and not sterilized compost. Additionally, the compost was analysed before and after carrying out the Cr(VI) removal process, by quantification of the acidic functional groups and kinetic monitoring of pH, conductivity and redox potential difference. The results showed that, under the conditions used, the microorganisms present in the compost did not affect the process of Cr(VI) removal and that the mechanism can be described by an adsorption model coupled to the reduction, were this adsorption is mainly done on the acidic funct...
5
tesis doctoral
Publicado 2018
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La coagulación y floculación constituyen la base en los tratamientos de agua, para la separación de mezclas sólido-líquido, así como un medio de disminución de la turbidez. En la presente investigación, se evalúo el efecto que ejerce la velocidad y dosis aplicada de sulfato de aluminio Al2 (SO4)3, así como la ejercida por el cloruro férrico FeCl3-floculante. Para la obtención de los datos experimentales, se utilizó un equipo de “Test de Jarras”, realizando pruebas a 06 niveles de dosis aplicada (1, 2, 3, 4, 5 y 6 mL), y a 05 niveles de velocidad de agitación (100, 150, 200, 250 y 300 r.p.m.). Los resultados reportan que las mejores condiciones, con Sulfato de Aluminio, se lograron con una dosis de 120 mg/L y a una velocidad de 100 r.p.m. de mezcla rápida y 25 r.p.m. de mezcla lenta, disminuyendo el color inicial de 213 UPC hasta 10 UPC, una turbidez inicial de 66.6 has...
6
artículo
In the process of copper -molybdenum separation is sometimes used reactive phosphorus pentasulfide P2S5 as copper depressant , which causes pollution problems in the final match molybdenite concentrates . The further processing that is performed to these concentrates to produce molybdenum trioxide , produces an increase in the concentration of this element in the final product of 0.05% by hampering commercialization. Due to the above, a study was conducted to hydrometallurgical laboratory scale aimed at finding the optimum conditions of the present process to remove phosphorus so that the content in the molybdenite concentrate is less than 0.04% . The study contemplated a sulfuric acid leaching environment, under different experimental conditions , which were able to remove about 51 % of the phosphorus present in the molybdenite concentrate , lowering the phosphorus content less than 0.0...
7
artículo
In the process of copper -molybdenum separation is sometimes used reactive phosphorus pentasulfide P2S5 as copper depressant , which causes pollution problems in the final match molybdenite concentrates . The further processing that is performed to these concentrates to produce molybdenum trioxide , produces an increase in the concentration of this element in the final product of 0.05% by hampering commercialization. Due to the above, a study was conducted to hydrometallurgical laboratory scale aimed at finding the optimum conditions of the present process to remove phosphorus so that the content in the molybdenite concentrate is less than 0.04% . The study contemplated a sulfuric acid leaching environment, under different experimental conditions , which were able to remove about 51 % of the phosphorus present in the molybdenite concentrate , lowering the phosphorus content less than 0.0...
8
artículo
Publicado 2016
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At present an environmental problem are refractory organic compounds such as dyes, which interfere with photosynthetic processes carried out by organisms in water bodies. Contaminants present in wastewater from industries such as textiles, paper, and pharmaceutical tannery among others, whose processes generate large volumes. The objective of this research was to remove dyes synthetic effluent textile, applying advanced technology to which electrocoagulation is used, this research allows to carry out a treatment without reagents, using electrical charges which destabilize the colloidal particles facilitating their precipitation, for which iron electrodes used with 0,8 mm spacing. The methodology is based on variations in current density, pH and residence time, the response variables are percentage of color removal and chemical oxygen demand. As a result of the experimentations removal ef...
9
artículo
Publicado 2016
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At present an environmental problem are refractory organic compounds such as dyes, which interfere with photosynthetic processes carried out by organisms in water bodies. Contaminants present in wastewater from industries such as textiles, paper, and pharmaceutical tannery among others, whose processes generate large volumes. The objective of this research was to remove dyes synthetic effluent textile, applying advanced technology to which electrocoagulation is used, this research allows to carry out a treatment without reagents, using electrical charges which destabilize the colloidal particles facilitating their precipitation, for which iron electrodes used with 0,8 mm spacing. The methodology is based on variations in current density, pH and residence time, the response variables are percentage of color removal and chemical oxygen demand. As a result of the experimentations removal ef...
10
artículo
Publicado 2017
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Removal of trivalent chromium and chemical oxygen demand (DQO) of tannery wastewater samples by electrocoagulation (EC) from discontinuous operation electrochemical reactor were studied. The influence of times (15 to 45 min), voltages (5 to 10 V), dilutions (0 to 2) and their interactions in EC process were significant (p <0.05). Increases in pH, temperature, and decreases of conductivity of the samples during the EC process were observed. The maximum removal of trivalent chromium (~98 %) and DQO (~48 %) was obtained with the treatment (45 min, 10 V and dilution of 2). Likewise, the experimental results allowed to develop mathematical models for the removal of trivalent chromium and DQO, respectively.
11
artículo
Publicado 2012
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A rule of customary international law is commonly believed to consist in «a general practice accepted as law», as stated in Art. 38, para. 1, b, of the Statute of the International Court of Justice. In studying the process that leads to the creation of a new customary rule where no rule existed or the replacement of an old rule by a new one, particularly important is the «first time» instance, that is the case when the need for a new regime is publicly manifested for the first time. As such a need cannot be grounded on legal precedents, for the simple reason that they do not exist, reasons of moral, political, social, economic or cultural character are often put forward to explain the innovation and make it acceptable for other States.
12
artículo
In this paper, the concept of improvisation in psychotherapy is reviewed. The concepts of effective therapist (a) and improvisation are described, distinguishing the resources that influence both elements are linked, becoming in the psychotherapeutic success. 3 Creative methodologies therapeutic work are described. Literature from psychology and policy was reviewed and it was concluded that a (an) effective therapist improvising successfully establishes a positive link with the person and makes flexible use of psychological technique and their own knowledge based on the needs presents person served. Finally, some thoughts are raised to visualize the cross-influence exercise paradigm, gender and class in the therapeutic process.
13
artículo
In this paper, the concept of improvisation in psychotherapy is reviewed. The concepts of effective therapist (a) and improvisation are described, distinguishing the resources that influence both elements are linked, becoming in the psychotherapeutic success. 3 Creative methodologies therapeutic work are described. Literature from psychology and policy was reviewed and it was concluded that a (an) effective therapist improvising successfully establishes a positive link with the person and makes flexible use of psychological technique and their own knowledge based on the needs presents person served. Finally, some thoughts are raised to visualize the cross-influence exercise paradigm, gender and class in the therapeutic process.
14
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...
15
artículo
Publicado 2016
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At present an environmental problem are refractory organic compounds such as dyes, which interfere with photosynthetic proces-ses carried out by organisms in water bodies. Contaminants present in wastewater from industries such as textiles, paper, and pharmaceutical tannery among others, whose processes generate large volumes. The objective of this research was to remove dyes synthetic effluent textile, applying advanced technology to which electrocoagulation is used, this research allows to carry out a treatment without reagents, using electrical charges which destabilize the colloidal particles facilitating their precipitation, for which iron electrodes used with 0,8 mm spacing. The methodology is based on variations in current density, pH and residence time, the response variables are percentage of color removal and chemical oxygen demand. As a result of the experimentations removal e...
16
artículo
Publicado 2023
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Objetivo: El objetivo de este estudio fue desarrollar e implementar un software educativo bidimensional para el proceso de aprendizaje del diseño de Prótesis Parciales Removibles. Materiales y métodos: Se utilizó el método científico y procedimientos de evaluación educativa para abordar las necesidades de la asignatura de Prótesis Parcial Removible en la Facultad de Odontología de la UNMSM de Perú en el año 2022. Se utilizó análisis, síntesis y encuestas. Se examinó la aplicabilidad del software y el cumplimiento de los requerimientos de enseñanza y aprendizaje, no sólo en la UNMSM sino en cualquier universidad con requerimientos y características similares. Resultados: La aplicación interna del software arrojó un valor final del 96%, mientras que la evaluación de alumnos y docentes mostró un 90% de aceptación, al considerar que el SEDUPPR es sencillo para instalar...
17
artículo
Publicado 2024
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Disinfection is achieved through procedures such as instrumentation, irrigation, and intra-canal medication; however, these are not enough since several studies have reported E. faecalis as one of the most prevalent persistent microorganisms in root canal treatments that have not achieved healing of the periapical tissues. Efforts have been made to improve disinfection protocols by including different technological tools, as in the case of photodynamic therapy, which uses a light source and photosensitizing substances that favor the process of elimination of the remaining bacteria within the root canal system. The present review of scientific literature delves into the clinical importance of photodynamic therapy and its effect on the disinfection and inhibition of E. faecalis within the root canal system, which has become a key element for the success of endodontic treatment.
18
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...
19
artículo
Publicado 2021
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One of the main residues generated in the dairy industry is whey, due to its high organic load it represents a serious environmental problem when it is disposed of to receiving natural bodies, altering its environmental quality. The efficiency of a combined system composed of electrocoagulation andbiological filter was evaluated; for which the electrocoagulation process was carried out in a batch reactor with aluminum and iron electrodes, the biological filter was packed with biomass composed of: Bacillus spp, Acinetobacter spp, Lactobacillus spp and Streptococcus spp. Electrocoagulation was responsible forreducing the organic load by more than 80% and the biological filter working with an average organic load of 1405 mg / L of BOD5 contributed to the reduction of the remaining organic load; the combined electrocoagulation-biological filter system with recir...
20
artículo
Publicado 2021
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One of the main residues generated in the dairy industry is whey, due to its high organic load it represents a serious environmental problem when it is disposed of to receiving natural bodies, altering its environmental quality. The efficiency of a combined system composed of electrocoagulation and biological filter was evaluated; for which the electrocoagulation process was carried out in a batch reactor with aluminum and iron electrodes, the biological filter was packed with biomass composed of: Bacillus spp, Acinetobacter spp, Lactobacillus spp and Streptococcus spp. Electrocoagulation was responsible for reducing the organic load by more than 80% and the biological filter working with an average organic load of 1405 mg / L of BOD5 contributed to the reduction of the remaining organic load; the combined electrocoagulation-biological filter system with recirculation achieved a removal ...
