14 research outputs found
Ubicación óptima de SVC considerando escenarios de expansión del sistema de transmisión
El presente trabajo muestra una
metodología para la ubicación de
compensadores de potencia reactiva SVC
en base a un proceso de optimización que
minimiza los costos asociados a la
implementación de los dispositivos de
control electrónicos a ser ubicados en la
red tomando en cuenta escenarios de
expansión del sistema de transmisión, para
así determinar el efecto en los aspectos
económicos y técnicos bajo la operación
en estado estable de un sistema de
potencia.
La proyección de la expansión de los
sistemas de transmisión se realiza
mediante la utilización del flujo óptimo de
potencia AC, el cual proporciona una
descripción de mayor precisión al flujo de
potencia de la red, teniendo como función
final la minimización de las pérdidas de
potencia y costos asociados a la
instalación de equipos compensadores al
sistema eléctrico, lo que ocasiona una
mejora en el perfil de voltaje nodal en cada
uno de los escenarios de expansión. La
metodología del control de voltaje y
redistribución de los flujos en las líneas de
transmisión tiene como objetivo principal
alcanzar una mejora en las variables de
calidad y eficiencia de los sistemas eléctricos.This work shows a methodology for the
location of SVC reactive power
compensators based on an optimization
process that minimizes the costs
associated with the implementation of the
electronic control devices to be located in
the network, taking into account system
expansion scenarios. transmission, in
order to determine the effect on economic
and technical aspects under the steady
state operation of a power system.
The projection of the expansion of the
transmission systems is carried out by
using the optimal AC power flow, which
provides a more accurate description of
the power flow of the network, with the
final function of minimizing power losses
and costs associated with the installation
of compensating equipment to the
electrical system, which causes an
improvement in the nodal voltaje profile
in each of the expansion scenarios. The
main objective of the voltaje control and
redistribution of fluxes in transmission
lines is to achieve an improvement in the
variables of quality and efficiency of
electrical systems
Advantages of a Free Software Culture for Qualitative Researchers in the Social Sciences
This paper aims to show the characteristics of free software and its implications for qualitative analysis in social research, especially in the case of new researchers and researchers with limited financial resources, as happens in third-world countries. First, the elements of qualitative research are described and understood as an approach linked to the interpretation and meanings that are given to the world. Secondly, the functions and handling of the RQDA software are explained. The main feature of RQDA is the fact that it is a free and open-source cross-platform tool, which allows project administration for data management purposes. The results show that even with the limitations that this type of tool may have, they offer a series of advantages that make their use possible and desirable to develop quality social research. Regarding the conclusions section, a reflection is offered on the use of technology based on free software for social research purposes, which must consider the pros and cons during its implementation. Concepts such as that of open access, or free culture, incorporate various forms of attending to historical problems suffered by science and education
Inmunoterapia contra el cáncer. identificación de genes esenciales
La relación entre el cáncer y el sistema inmunológico se ha descrito y estudiado desde el siglo XIX. El sistema inmune tiene por un lado la capacidad de detectar y eliminar células tumorales y por el otro, puede proveer un microambiente favorable para el crecimiento tumoral. Mediante el proceso de inmunoedición, el hospedero puede amoldar la inmunogenicidad de tumores a través del sistema inmune innato y adaptativo. La proliferación de células tumorales es modificada por medio de la actividad de efectores y vías de señalización pro- y antitumorales. La inmunoterapia contra el cáncer ofrece opciones terapéuticas específicas para algunas enfermedades malignas previamente intratables
Índice de contraste morfológico basado en el análisis de los contornos y el fondo de la imagen
Resumen. En este artículo se presenta un índice para
cuantificar el contraste que se percibe en una imagen.
El índice está basado en la ley de Weber y toma en
consideración una estimación del fondo de la imagen
mediante la erosión de la apertura por reconstrucción.
El desempeño de la propuesta se ilustra con un
conjunto de imágenes procesadas por un mapeo de
contraste y se compara con dos medidas de contraste
dadas en la literatura
A study on the degree of compliance to infection control standards of hospital personnel in two selected hospitals in Cavite
A descriptive, non-experimental type of research was employed in this study. Using purposive sampling technique, the subjects of this study were the nurses, midwives, and orderlies of two (2) selected hospitals and the researchers themselves. A checklist type of questionnaire was utilized to gather data on the presented problem. Data was analyzed through mean and t-test of independent means. Based on the findings of this study, the researchers concluded that hospital personnel, specifically the nurses and orderlies, of Hospital 1 have a higher degree of compliance with Infection Control Standard as compared to nurses and orderlies of Hospital2. Findings also showed that the midwives of the two (2) hospitals have the same degree of compliance with Infection Control Standard. The researchers concluded that nurses and midwives in Hospital 1 observe the handling of blood and body fluids because these were infectious. They likewise observed handwashing techniques, wearing gloves when touching body fluids, blood and mucous membranes or non-intact skin of all patients and wearing mask and gown during procedures of mucous membranes of mouth, nose and eyes. Nurses of Hospital 1 also observed to have sharp precautions 65-85% of the time such as the use of disposable needles and syringes. They only used sterile needles and one (1) sterile syringe for injection and handled used needles and sharp instruments as infected materials. It can also be concluded that nurses of Hospital 1 follow handling/disposal of infected waste material 65-85% of the time such as refraining from all direct patient care and from handling patient care equipment when there is a presence of exudes of weeping dermatitis. The researchers concluded that orderlies in the two hospitals comply with Laundry and Housekeeping precautions and that the perception of the hospital personnel of the two (2) selected hospitals regarding that degree of compliance to Infection Control Standard is different from the observation of the researchers, where hospital personnel of Hospital 1 and 2 rated their degree of compliance higher than the ratings given by the researchers
Procedimientos administrativos en materia aduanera
La función de autoridad administrativa que tiene como finalidades ya sea ampliar o restringir las facultades de las personas o exigir el entero de contribuciones, derechos sobre todo en un trámite aduanero, pero también de almacenaje oficial, están sujetos necesariamente a procedimientos definidos en la ley. Esto es aplicable desde luego y de una manera particularmente importante en el despacho aduanero