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Sample records for bogota dc colombia

  1. Mobility, environment and heritage sites: A reflection about the sector of the Candelaria, Bogota DC, Colombia

    International Nuclear Information System (INIS)

    Martinez de V, Beatriz; Aguilar M, Maria del Pilar

    2008-01-01

    This article is part of the first bibliographic revision of the Sustainable mobility in historic centers in Colombia research, which proposes the inclusion of the concepts of technology, mobility,transport and environment, with emphasis on the impact of transport technologies on the built environment and the architectural heritage. The objective is to build a panoramic vision of the problem and so call attention to the important relationships that exist between technology, mobility, transport, environment and historic centers. Initially, a brief reference to the context and the sector of La Candelaria on the south Eastern part of Bogota DC, Colombia, with an extension of 188.12 Hectares and an altitude of 2,600 meters above sea level, declared a National Monument in 1963. Further on, aspects concerning aspects associated with mobility and transport in Bogota during the 19 th and 20 th centuries, and the effect of transport methods on the environment and architectural heritage. Finally, a brief description of some projects, plans and mobility and transport studies searching for solutions to the problems created in the historic center by transport technologies

  2. Fire incidence on vegetation in Cundinamarca and Bogota D.C. (Colombia) during the 2001 - 2010 period

    International Nuclear Information System (INIS)

    Amaya Villabona, Diego; Armenteras Pascual, Dolores

    2012-01-01

    This work aims to use remote sensing as a method for determining fire dynamics in the department of Cundinamarca and the city of Bogota D.C. in Colombia, by analyzing the temporal and spatial distribution of fires and the different types of vegetation affected in the 2001 - 2010 period. Based on modis fire hotspots, we found that the pattern fires in the study area are within the national standard, which includes increased number of events during the dry seasons (January - March and July-September). The fire incidence is caused by low rainfall that complements the root causes of ignition, which are mainly started by human intervention. The most affected populations are Caparrapi with 159 fires; Bogota with 152 fires and Guaduas with 101 fires. Bogota recorded most of their fires within protected areas in the south, in the area of Sumapaz. Sumapaz national park (84), followed by the district integrated management Cuchilla de San Antonio (21) and protective forest reserve Paramo Grande (9). Among the vegetation affected we can find grasses, shrubs, bushes and mosaics, emphasizing high values of impact on vegetation of paramo and subparamo. The central and northwestern parts, south and southeast parts of the department are those with more outbreaks, and most of them are between 0 to 1,000 masl and 3,000 to 4,000 masl. Finally active fires in the study area follow a pattern associated to the climate and in particular to the dry season but also show an altitudinal pattern. National and regional protected areas are effective against fires.

  3. Results of Global Youth Tobacco Surveys in Public Schools in Bogota, Colombia

    Science.gov (United States)

    Pardo, Constanza; Pineros, Marion; Jones, Nathan R.; Warren, Charles W.

    2010-01-01

    Background: The purpose of this paper is to use data from the Global Youth Tobacco Survey (GYTS) conducted in Bogota, Colombia, in 2001 and 2007 to examine changes in tobacco use among youth 13-15 years of age. The current tobacco control effort in Bogota will be accessed relative to Colombia ratifying the World Health Organization Framework…

  4. Adolescents' Expectations for Higher Education in Bogota, Colombia, and La Paz, Bolivia

    Science.gov (United States)

    Forste, Renata; Heaton, Tim B.; Haas, David W.

    2004-01-01

    Drawing on status attainment models, the authors examine the effects of family, peer, and school factors on expectations to graduate from a university for a sample of high school students in Bogota, Colombia, and La Paz, Bolivia. The expansion of higher education in these countries has followed different strategies. In Bolivia, the policy has been…

  5. Alcohol, Tobacco, and Other Psychoactive Drug Use among High School Students in Bogota, Colombia.

    Science.gov (United States)

    Perez, Miguel A.; Pinzon-Perez, Helda

    2000-01-01

    Investigated health behaviors practiced by 10th graders in Bogota, Colombia. Data from a modified version of the Youth Risk Behavior Survey indicated that there was a high use of gateway substances (tobacco and alcohol) among respondents, but lower usage, when compared to U.S. students, of other mind-altering substances such as marijuana,…

  6. Computer aided solar house design made of ``Guadua`` in Bogota, Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Lozano, M.C.; Chalfoun, N.V. [Univ. of Arizona, Tucson, AZ (United States). College of Architecture

    1995-11-01

    Bogota, Colombia, is the third highest capital in South America, its location near the equator assures high altitudes over the horizon and almost 5 hours of daily mean sunshine. Since 1981, efforts for using natural energy instead of nonrenewable fuel have been targeted to Colombia`s residential construction industry. This paper focuses on a computer aided design process for passive solar low-income row housing in Bogota. Thermal comfort for this tropical climate has been achieved through employing ``Guadua,`` a strong bamboo specie,as an alternative wall system to the traditional brick, adobe, or concrete structures. Through computer analysis, several energy conservation and passive solar strategies have been optimized for a case study row housing type common to the region. The load savings compared to a 6 inch CMU house totaled 72%, while the operating cost has been reduced by 71%. Furthermore, this lightweight and inexpensive ``Guadua`` material has reduced the construction cost by 30%.

  7. [Medication use among older adults in Bogota, Colombia].

    Science.gov (United States)

    Cano-Guitierrez, Carlos; Samper-Ternent, Rafael; Cabrera, Javier; Rosselli, Diego

    2016-01-01

    To determine the frequency and types of medication used by older adults living in the Colombian capital, Bogota, and to identify the use of potentially inappropriate medications according to the revised Beers criteria. Data were obtained from the health, welfare, and aging (SABE, Spanish: salud, bienestar y envejecimiento) study conducted in both urban and rural areas of Bogota in 2012. The Mann-Whitney U test was used to analyze sex-related differences in the number of medications used among age-stratified subgroups. Of 2 000 subjects, 1,268 (63.4%) were women; furthermore, 1,514 (75.7%) of the total participants had ≤5 years of basic education. The self-reported prevalence rates of hypertension and diabetes were 56.9% and 17.5%, respectively. The average number of medications per subject was 3.24, and it was higher in women (3.50) than in men (2.79). A total of 549 subjects (27.4%) reported using ≥5 medications. Only 311 subjects (15.6%) reported not using any medication. According to the Beers criteria, 443 (6.9%) of the medications were potentially inappropriate. The use of inappropriate medications is a major problem among older adults in Bogota. Further studies should identify factors that increase the risks of polypharmacy and inappropriate medication use and design interventions that would allow older adults to avoid these risks.

  8. Fluoride Concentration in Children’s Toothpaste and Mouthwash sold in Bogota, Colombia

    OpenAIRE

    Baez-Quintero, Liliana Carolina; Carlos-Botazzo, Delbem Alberto; Nagata, Emi Mariana; Pelim-Pessan, Juliano

    2016-01-01

    Introduction: Toothpaste and mouthwash are obviously the most used means offluoride application by the general population. Objective: To determine fluoride concentrations in toothpaste and mouthwash for children sold in the supermarkets of Bogota, Colombia, and to verify if said values are consistent with the values informed by the manufacturer.Material and Methods: 17 toothpastes and 4 mouthwashes were evaluated. The total amount of fluoride (ft) and of ionic fluoride (fi) was evaluated; and...

  9. A Sub-category Disaggregated Greenhouse Gas Emission Inventory for the Bogota Region, Colombia

    Science.gov (United States)

    Pulido-Guio, A. D.; Rojas, A. M.; Ossma, L. J.; Jimenez-Pizarro, R.

    2012-12-01

    Several international organizations, such as UNDP and UNEP, have recently recognized the importance of empowering sub-national decision levels on climatic governance according to the subsidiarity principle. Regional and municipal authorities are directly responsible for land use management and for regulating economic sectors that emit greenhouse gases (GHG) and are vulnerable to climate change. Sub-national authorities are also closer to the population, which make them better suited for educating the public and for achieving commitment among stakeholders. This investigation was developed within the frame of the Regional Integrated Program on Climate Change for the Cundinamarca-Bogota Region (PRICC), an initiative aimed at incorporating the climate dimension into the regional and local decision making. The region composed by Bogota and its nearest, semi-rural area of influence (Province of Cundinamarca) is the most important population and economic center of Colombia. Our investigation serves two purposes: a) to establish methodologies for estimating regional GHG emissions appropriate to the Colombian context, and b) to disaggregate GHG emissions by economic sector as a mitigation decision-making tool. GHG emissions were calculated using IPCC 1996 - Tier 1 methodologies, as there are no regional- or country-specific emission factors available for Colombia. Top-Down (TD) methodologies, based on national and regional energy use intensity, per capita consumption and fertilizer use, were developed and applied to estimate activities for following categories: fuel use in industrial, commercial and residential sectors (excepting NG and LPG), use of ozone depleting substances (ODS) and substitutes, and fertilizer use (for total emissions of agricultural soils). The emissions from the remaining 22 categories were calculated using Bottom-Up (BU) methodologies given the availability of regional information. The total GHG emissions in the Cundinamarca-Bogota Region on 2008 are

  10. Air Pollution alongside Bike-Paths in Bogota - Colombia

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    Juan Felipe Franco

    2016-11-01

    Full Text Available The study we present in this paper aims at characterizing the range of fine particulate matter (PM2.5 and black carbon (BC concentrations to which bike-path users in Bogotá are exposed to. Using a bike equipped with a DustTrak and a micro-aethalometer we measured PM2.5 and BC concentration levels along bike-paths corridors, during weekdays and weekends. Experiments were conducted in fours streets, representing four typical configurations of bike-paths in the city. Traffic data for workdays was also available from local mobility authority. Results indicate that bike-paths users in Bogota are exposed to air pollution levels far exceeding the threshold values established as potentially dangerous for human health. Average concentrations for PM2.5 ranged between 80 and 136 ug/m3 in workdays and between 30 and 72 ug/m3 in weekends. BC mean concentrations were between 16 and 38 µg/m3 during workdays and in the range 10 to 32 µg/m3 during weekends. A statistically significant difference exists in the levels of pollutants concentrations measured during workdays and weekends for all the considered bike paths. According to our results, both traffic volume and diffusions conditions, which are affected by many factors including street geometry, affect bike-path user’s exposure levels. Taking into account the important role that bicycling is playing as an alternative transport mode in Latin American cities, we consider these results provide useful insights to increase the appreciation of the excessive bikers´ exposure to air pollution in Bogotá. Moreover, these findings contribute with technical elements that should lead to the inclusion of air quality variable when designing and planning sustainable urban mobility infrastructures.

  11. Frequency of tuberculous and non-tuberculous mycobacteria in HIV infected patients from Bogota, Colombia

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    León Clara I

    2001-11-01

    Full Text Available Abstract Background The prevalence of infections by Mycobacterium tuberculosis and non-tuberculous Mycobacterium species in the HIV-infected patient population in Colombia was uncertain despite some pilot studies. We determined the frequency of isolation of Mycobacterium tuberculosis and of non-tuberculous Mycobacterium species in diverse body fluids of HIV-infected patients in Bogota, Colombia. Methods Patients who attended the three major HIV/AIDS healthcare centres in Bogota were prospectively studied over a six month period. A total of 286 patients were enrolled, 20% of them were hospitalized at some point during the study. Sixty four percent (64% were classified as stage C, 25% as stage B, and 11% as stage A (CDC staging system, 1993. A total of 1,622 clinical samples (mostly paired samples of blood, sputum, stool, and urine were processed for acid-fast bacilli (AFB stain and culture. Results Overall 43 of 1,622 cultures (2.6% were positive for mycobacteria. Twenty-two sputum samples were positive. Four patients were diagnosed with M. tuberculosis (1.4%. All isolates of M. tuberculosis were sensitive to common anti-tuberculous drugs. M. avium was isolated in thirteen patients (4.5%, but only in three of them the cultures originated from blood. The other isolates were obtained from stool, urine or sputum samples. In three cases, direct AFB smears of blood were positive. Two patients presented simultaneously with M. tuberculosis and M. avium. Conclusions Non-tuberculous Mycobacterium infections are frequent in HIV infected patients in Bogota. The diagnostic sensitivity for infection with tuberculous and non-tuberculous mycobacteria can be increased when diverse body fluids are processed from each patient.

  12. Mobility environment and urban centers: A reflection about the sector of the Candelaria, Bogota, Colombia

    International Nuclear Information System (INIS)

    Martinez de V, Beatriz; Aguilar, Maria del pilar

    2007-01-01

    This article is part of the first bibliographic revision of the Sustainable mobility in historic centers in Colombia research, which proposes the inclusion of the concepts of technology, mobility, transport and environment, with emphasis on the impact of transport technologies on the built environment and the architectural heritage. The objective is to build a panoramic vision of the problem and so call attention to the important relationships that exist between technology, mobility, transport, environment and historic centers. Initially, a brief reference to the context and the sector of La Candelaria on the south eastern part of Bogota, Colombia, with an extension of 188.12 Hectares and an altitude of 2,600 meters above sea level, declared a National Monument in 1963. Further on, aspects concerning aspects associated with mobility and transport in Bogota during the 19th and 20th centuries, and the effect of transport methods on the environment and architectural heritage. Finally, a brief description of some projects, plans and mobility and transport studies searching for solutions to the problems created in the historic center by transport technologies

  13. Energy assessment of peri-urban horticulture and its uncertainty: Case study for Bogota, Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Bojaca, C.R. [Centro de Investigaciones y Asesorias Agroindustriales, Facultad de Ciencias Naturales, Universidad de Bogota Jorge Tadeo Lozano, P.O. Box: 140196, Chia (Colombia); Schrevens, E. [Department of Biosystems, Faculty of Applied Bioscience Engineering, Katholieke Universiteit Leuven, Geo-Institute, Celestijnenlaan 200 E, 3001 Heverlee (Belgium)

    2010-05-15

    Scarce information is available about the energy use pattern of horticultural commodities in general and more specifically for peri-urban horticulture. Peri-urban horticulture in the outskirts of Bogota is an important source of vegetables for Colombia's capital city. Based on detailed follow-ups and periodic field measurements an output-input energy balance was performed with the main objective to study the energy use efficiency of those systems. An uncertainty analysis on the input factors and on the energy equivalents was then applied. Over a measurement period of 18-month, the energy use for coriander, lettuce, radish and spinach was investigated, respectively 12.1, 18.8, 6.6 and 10.7 GJ ha{sup -1} were consumed in these cropping systems. Negative balances were observed for all species exception made for spinach where an output:input ratio of 1.16 was found. The two-way uncertainty analysis showed the highest uncertainty for N-based fertilization while no significant effect was observed for seeds in direct sowing crops. Sustainability of peri-urban horticulture around Bogota is compromised not only because of the city expansion but also due to its inefficient energy use. Technical improvements are required to ensure the environmental subsistence of this important sector for the metropolitan area of the city. (author)

  14. Microscopic Study of Skin Diseases in Horses from the Bogota Savanna, Colombia

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    Iovana Castellanos Londoño

    2014-06-01

    Full Text Available Horses hold third place in number of cases of skin disease after cats and dogs; however, there is little information about the demographic aspects of dermatological diseases in this species in Colombia. The purpose of this work was to carry out a preliminary study in order to determine the dermatological diseases that affect horses in the Bogota Savanna, through biopsy, skin scraping and trichogram, in order to approach the diagnosis and thus to establish therapeutic and prophylactic measures that benefit the animal’s health and productivity in commercial farms. Thirty-nine skin biopsies, thirty-nine cutaneous scraping and thirtyseven samples of hairy peel from horses with some kind of skin disease were received, all of which were processed by the Histopathology Laboratory from La Salle University. The inflammatory injuries were sorted taking into account the histological patterns of inflammatory skin disease and tumors, according to the classification by the World Health Organization (WHO. Allergic dermatitis was the most common pathology (46% and neoplasia was observed in 13% of the cases; fungal spores in ectothrix position were found in 10% of the cutaneous scrapes. Mites of the type Psoroptes spp were identified in one of the trichograms. This is the first report of microscopic diagnosis of skin diseases of horses in the country with the goal of contributing with the demographic knowledge of skin diseases in the Bogota Savanna.

  15. Urban air pollution in school-related microenvironments in Bogota, Colombia

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    Juan Felipe Franco

    2013-05-01

    Full Text Available Particle-related pollution (PM10, PM2.5 and soot was measured in both indoor and outdoor microenvironments at four public elementary schools in Bogota, Colombia. Three of these schools were located alongside major urban roads in which different types of public transit systems are used (bus rapid transit system and conventional transit buses. The fourth school was located on a non-congested road (background school. Pollutant levels at schools situated on major-roads were higher than those found at the low-congestion-road school. Outdoor black carbon daily mean concentrations at the schools located near major roads were up to six times higher than those recorded at the background school. Mean particulate matter concentrations at schools near major roads were above international standards, suggesting that school-age children in Bogota are exposed to pollution levels that are considered to be harmful by environmental and public health authorities. Elevated indoor and outdoor pollutant concentrations documented in this study suggested that traffic has a direct impact on air quality regarding the schools’ characterised microenvironments.

  16. Triceps and subscapular skinfold thicknesses percentiles and cut-offs for overweight and obesity in a population-based sample of schoolchildren in Bogota, Colombia

    OpenAIRE

    Lopez Cifuentes, Mario Ferney

    2016-01-01

    OBJECTIVES: The aims of this study were to establish a Colombian smoothed centile charts and LMS tables for tríceps, subscapular and sum tríceps+subscapular skinfolds; appropriate cut-offs were selected using receiver operating characteristic analysis based in a populationbased sample of schoolchildren in Bogota, Colombia and to compare them with international studies. METHODS: A total of 9 618 children and adolescents attending public schools in Bogota, Colombia (55.7% girl...

  17. Personal dosimetry TLD 100 in orthopedic surgeons exposed to ionizing radiation in Bogota - Colombia; Dosimetria personal TLD 110 en medicos ortopedistas expuestos a radiacion ionizante en Bogota - Colombia

    Energy Technology Data Exchange (ETDEWEB)

    Sierra C, B. Y.; Jimenez, Y. [Universidad Nacional de Colombia, Departamento de Fisica, Grupo de Fisica Medica, Carrera 45 No. 26-85, Bogota (Colombia); Plazas, M. C. [Hospital Universitario Fundacion Santa Fe de Bogota, Instituto de Oncologia Carlos Ardila Lulle, Calle 119, No. 7-90, 220246 Bogota (Colombia); Eslava S, J. [Universidad Nacional de Colombia, Instituto de Investigaciones Clinicas, Grupo Equidad en Salud, Carrera 45 No. 26-85, Bogota (Colombia); Groot R, H., E-mail: brigith.sierra@gmail.com [Universidad de los Andes, Laboratorio de Genetica Humana, Carrera 1 No. 18A -12, Bogota (Colombia)

    2014-08-15

    Orthopedic surgeons should be considered as professionals occupationally exposed to ionizing radiation, for using C arc (fluoroscope) an equipment of X type radiation emission, during surgical procedures for imaging generation. Some health institutes, use of C arc under uncontrolled circumstances, such a lack of dosimetry control, incomplete or absence of personnel protective elements and protective measures, which in turn, lead to a high exposition to the personnel. Materials and methods. Study of double match cohort by age and gender, was conducted, in four health institutions of second and third level of attention in Bogota city. Personal dosimetry measurements with TLD-100 dosimetry crystals in both cohorts and environmental dosimetry in each of operation rooms used for orthopedic procedures, were carry out during six months of follow up. Dosimetry crystals were read in a Harshaw 4500 - Bicron equipment, in the Medical Physics Laboratory of National University of Colombia. Results. Dosimetry measurements are compatibles with those of occupationally exposed personnel 3.44 mSv/6 m CI 95% (1.66-3.99), even does not overpass ICRP recommendations, are higher as were expect at the beginning of the study. The median of effective accumulative dose in thorax is 3,4 mSv CI 95% (1,66-3,99), higher in comparison with neck value 2,7 mSv CI 95% (1,73-3,80) and hand dosimetry 1,42 mSv CI 95% (0,96-2,34). Conclusions: Orthopedic surgeons should be considered occupational exposed to ionizing radiation, who has to accomplish to the radiological protection measures, dosimetric follow up and maintenance of the used X ray equipment. It was confirm throughout this study that dosimetry shows higher levels as expected at the beginning of the study, compatible with occupationally exposed personnel. (Author)

  18. Genotyping Klebsiella pneumoniae isolated from hepatic abscesses in three patients from Bogota, Colombia

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    Dora I. Ríos

    2013-01-01

    Full Text Available Pyogenic liver abscess caused by Klebsiella pneumoniae represents an ever increasing entity which has mainly been described as occurring in Asia, even though, on a smaller scale, cases are being more frequently described from the USA and Europe, 13% overall mortality being reached worldwide. Affected patients are severely sick, suffering from fever, sweating, having increased acute phase reactants and risk factors such as Diabetes Mellitus, alcoholism and the inherent characteristics of the bacteria causing the disease. Objective: in this work we used a Multilocus Sequencing Typing (MLST, a nucleotide sequence-based method in order to characterize the genetic relationships among bacterial isolates. Materials and methods: the report is focused on three cases involving patients suffering from pyogenic liver abscess caused by Klebsiella pneumoniae in two hospitals in Bogota, Colombia, where phenotyping and hypermucoviscosity studies were carried out, as well as the genotyping of cultured Klebsiella isolates. Reults: it was found that the isolated microorganism in cases I and II corresponded to the same K. pneumoniae strain, having 100% sequence identity for the 5 genes being studied while the strain in Case III was genotypically different. Conclusion: it is important to carry out multidisciplinary studies allowing all pyogenic liver abscess cases reported in Colombia to be complied to ascertain the frequency of microorganisms causing this pathology in our country, as well as a genotyping study of different K. pneumoniae strains to compare them and confirm clonal and pathogenicity relationships through housekeeping gene analysis.

  19. Effect of socioeconomic status on the association between air pollution and mortality in Bogota, Colombia

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    Luis Camilo Blanco-Becerra

    2014-07-01

    Full Text Available Objective. To evaluate the modification effect of socioeconomic status (SES on the association between acute exposure to particulate matter less than 10 microns in aerodynamic diameter (PM10 and mortality in Bogota, Colombia. Materials and methods. A time-series ecological study was conducted (1998-2006. The localities of the cities were stratified using principal components analysis, creating three levels of aggregation that allowed for the evaluation of the impact of SES on the relationship between mortality and air pollution. Results. For all ages, the change in the mortality risk for all causes was 0.76% (95%CI 0.27-1.26 for SES I (low, 0.58% (95%CI 0.16-1.00 for SES II (mid and -0.29% (95%CI -1.16-0.57 for SES III (high per 10μg/m3 increment in the daily average of PM10 on day of death. Conclusions. The results suggest that SES significantly modifies the effect of environmental exposure to PM10 on mortality from all causes and respiratory causes.

  20. [Characterization of patients who died of invasive pneumococcal disease in the child population of Bogota, Colombia].

    Science.gov (United States)

    Rojas, Juan Pablo; Leal, Aura Lucia; Patiño, Jaime; Montañez, Anita; Camacho, Germán; Beltrán, Sandra; Bonilla, Carolina; Barrero, Rocio; Mariño, Cristina; Ramos, Nicolás

    2016-01-01

    Streptococcus pneumoniae (S. pneumoniae), also known as pneumococcus, is one of the main bacteria associated with mortality in children under 2 years of age, with a morbidity and mortality incidence that varies according to demographics and exposure to risk, or protective factors. To describe the child mortality due to invasive pneumococcal disease (IPD) between 2008 -2014 (6 years), in 8 Medical Centres in Bogotá, Colombia. Descriptive observational case series of patients who died of IPD, aged 28 days to 18 years, in 8 tertiary care institutions in Bogota, Colombia. The study period was from 1 January 2008 to 15 January 2014. 239 patients. A total of 239 registered cases of IPD were reviewed, showing a mortality of 8% (n 18). The mean age of patients that died was 43.7 months, with an age range from 2 to 176 months (14 years), with 66% of the cases being male. Serotypes were identified in 8 patients, finding: 6A, 6B, 10A, 14, 18C, 23B, 23F, and 35B. The most common clinical presentation of the cases was meningitis with mortality of 33% (6 cases), followed by bacteraemia without focus in 28% (5 cases), and pneumonia with 27% (5 cases). Combined clinical situations were presented, such as pneumonia and meningitis in 11% (2 cases). Two of the patients had clearly documented risk factors for IPD (asplenia and chronic respiratory disease). IPD mortality is particularly high in children under 2 years in male patients, especially when presented with a meningeal focus (44%). Serotyping was not possible in all patients who died, since no strain isolated was sent to the National Institute of Health. Continuous and systematic vigilance is required to evaluate the impact of vaccination and possible changes in the pattern of presentation of disease. Copyright © 2015 Sociedad Chilena de Pediatría. Publicado por Elsevier España, S.L.U. All rights reserved.

  1. Heaths and forests of the western hills of Chia, Bogota savanna, Colombia

    International Nuclear Information System (INIS)

    Cortes S, Sandra P.; Van der Hammen, Thomas; Rangel Ch, J Orlando

    2000-01-01

    The authors make a study of the heaths and forests of the western hills of the population of Chia, located in the savanna of Bogota and the presence or absences of these in the same Bogota savanna; the authors treat topics like their physiognomy and composition, distribution and ecology among other topics

  2. Notes of records about yellow-green vireo (vireo flavoviridis: vireonidae) at the Sabana de Bogota, Cundinamarca (Colombia)

    International Nuclear Information System (INIS)

    Acevedo Charry, Orlando A; Echeverri Mallarino, Laura

    2013-01-01

    The Yellow-green Vireo (Vireo flavoviridis) is migrant bird species, previously none reported to Cundinamarca Department. Distribution known in Colombia only includes localities below 1500 masl. Two individuals of the Yellow-green Vireo were observed at 2600 masl in the Universidad Nacional de Colombia Bogota Campus, at the Sabana de Bogota in Cundinamarca Department in 2011. In addition, we found 18 unpublished records for this species in the Cundinamarca Department above 2500 masl. Ten records were museum specimens (Instituto de Ciencias Naturales de la Universidad Nacional de Colombia, Vertebrate collection (Ornitology) Universidad de los Andes and Instituto de Investigacion en Recursos Biologicos Alexander von Humboldt Museum), and the other eight were birdwatching records. The oldest record was in 1964, but the great majority of records were collected between 2008 and 2013. We consider that the Yellow-green Vireo has been unnoticed in the Cundinamarca Department because of its morphological similarities with the Red-eye Vireo (V. olivaceus). Furthermore, the lack of review of scientific collections, and the deposition of specimens discontinuous there, make gap information about biodiversity distribution. Apparently, Yellow-green Vireo could be more common than expected above 1500 m during its migration, such as it was observed in at Cundinamarca Department.

  3. Primary health care contribution to improve health outcomes in Bogota-Colombia: a longitudinal ecological analysis

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    Mosquera Paola A

    2012-08-01

    Full Text Available Abstract Background Colombia has a highly segmented and fragmented national health system that contributes to inequitable health outcomes. In 2004 the district government of Bogota initiated a Primary Health Care (PHC strategy to improve health care access and population health status. This study aims to analyse the contribution of the PHC strategy to the improvement of health outcomes controlling for socioeconomic variables. Methods A longitudinal ecological analysis using data from secondary sources was carried out. The analysis used data from 2003 and 2007 (one year before and 3 years after the PHC implementation. A Primary Health Care Index (PHCI of coverage intensity was constructed. According to the PHCI, localities were classified into two groups: high and low coverage. A multivariate analysis using a Poisson regression model for each year separately and a Panel Poisson regression model to assess changes between the groups over the years was developed. Dependent variables were infant mortality rate, under-5 mortality rate, infant mortality rate due to acute diarrheal disease and pneumonia, prevalence of acute malnutrition, vaccination coverage for diphtheria, pertussis, tetanus (DPT and prevalence of exclusive breastfeeding. The independent variable was the PHCI. Control variables were sewerage coverage, health system insurance coverage and quality of life index. Results The high PHCI localities as compared with the low PHCI localities showed significant risk reductions of under-5 mortality (13.8% and infant mortality due to pneumonia (37.5% between 2003 and 2007. The probability of being vaccinated for DPT also showed a significant increase of 4.9%. The risk of infant mortality and of acute malnutrition in children under-5 years was lesser in the high coverage group than in the low one; however relative changes were not statistically significant. Conclusions Despite the adverse contextual conditions and the limitations imposed by the

  4. Personal dosimetry TLD 100 in orthopedic surgeons exposed to ionizing radiation in Bogota - Colombia

    International Nuclear Information System (INIS)

    Sierra C, B. Y.; Jimenez, Y.; Plazas, M. C.; Eslava S, J.; Groot R, H.

    2014-08-01

    Orthopedic surgeons should be considered as professionals occupationally exposed to ionizing radiation, for using C arc (fluoroscope) an equipment of X type radiation emission, during surgical procedures for imaging generation. Some health institutes, use of C arc under uncontrolled circumstances, such a lack of dosimetry control, incomplete or absence of personnel protective elements and protective measures, which in turn, lead to a high exposition to the personnel. Materials and methods. Study of double match cohort by age and gender, was conducted, in four health institutions of second and third level of attention in Bogota city. Personal dosimetry measurements with TLD-100 dosimetry crystals in both cohorts and environmental dosimetry in each of operation rooms used for orthopedic procedures, were carry out during six months of follow up. Dosimetry crystals were read in a Harshaw 4500 - Bicron equipment, in the Medical Physics Laboratory of National University of Colombia. Results. Dosimetry measurements are compatibles with those of occupationally exposed personnel 3.44 mSv/6 m CI 95% (1.66-3.99), even does not overpass ICRP recommendations, are higher as were expect at the beginning of the study. The median of effective accumulative dose in thorax is 3,4 mSv CI 95% (1,66-3,99), higher in comparison with neck value 2,7 mSv CI 95% (1,73-3,80) and hand dosimetry 1,42 mSv CI 95% (0,96-2,34). Conclusions: Orthopedic surgeons should be considered occupational exposed to ionizing radiation, who has to accomplish to the radiological protection measures, dosimetric follow up and maintenance of the used X ray equipment. It was confirm throughout this study that dosimetry shows higher levels as expected at the beginning of the study, compatible with occupationally exposed personnel. (Author)

  5. Monotony, Isolation and Backward Agriculture. Travel Accounts of 19th Century and Agrarian History of Bogota Plateau (Colombia

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    Katherinne Giselle Mora Pacheco

    2015-07-01

    Full Text Available Different works of Agrarian History reproduce a similar description of Bogota Plateau (Colombia throughout the nineteenth century: agricultural use since colonial times; vast fields of wheat and barley; abrupt replacement of crops by cattle; agricultural crisis linked to the agro-export booms and the demand for tropical products that could not be obtained above 2000 meters. This paper discusses how this approach has perpetuated descriptions of travelers who visited the region during the nineteenth century and wrote up their notebooks based on their origins, objectives, political and economic interests, or from affirmations of their guides and informants. This article rebuilds a profile of travelers that are most often quoted by historians, their views about the Plateau landscape and its farming and ranching, and their influence on today reconstructions of the agrarian history of Bogota Plateau along nineteenth century. This text invites to contrast the travel accounts among themselves and with another sources, and also to incorporate the results of the research about the Colonial period and the biophysical conditions of the regions under study in the analysis.

  6. Latin American Clinical Epidemiology Network Series - Paper 5: Years of life lost due to premature death in traffic accidents in Bogota, Colombia.

    Science.gov (United States)

    Quitian-Reyes, Hoover; Gómez-Restrepo, Carlos; Gómez, Maria Juliana; Naranjo, Salome; Heredia, Patricia; Villegas, John

    2017-06-01

    This study aimed to quantify the number of years of life lost in traffic accidents in Bogota, Colombia. The years of life lost were calculated using the 'age-standardized expected years of life lost' method, the table of Japanese adjusted life expectancy and the database of the Institute of Legal Medicine and Forensic Science between September 2012 and August 2013. During a period of 1 year, 430 people died and 10,056.3 years of life were lost in Bogota due to traffic accidents. The mortality burden of traffic accidents in Bogota is high. Further studies are required in order to characterize the accidents and develop effective policy decisions. Copyright © 2016 Elsevier Inc. All rights reserved.

  7. Spatial and temporal disaggregation of transport-related carbon dioxide emissions in Bogota - Colombia

    Science.gov (United States)

    Hernandez-Gonzalez, L. A.; Jimenez Pizarro, R.; Néstor Y. Rojas, N. Y.

    2011-12-01

    As a result of rapid urbanization during the last 60 years, 75% of the Colombian population now lives in cities. Urban areas are net sources of greenhouse gases (GHG) and contribute significantly to national GHG emission inventories. The development of scientifically-sound GHG mitigation strategies require accurate GHG source and sink estimations. Disaggregated inventories are effective mitigation decision-making tools. The disaggregation process renders detailed information on the distribution of emissions by transport mode, and the resulting a priori emissions map allows for optimal definition of sites for GHG flux monitoring, either by eddy covariance or inverse modeling techniques. Fossil fuel use in transportation is a major source of carbon dioxide (CO2) in Bogota. We present estimates of CO2 emissions from road traffic in Bogota using the Intergovernmental Panel on Climate Change (IPCC) reference method, and a spatial and temporal disaggregation method. Aggregated CO2 emissions from mobile sources were estimated from monthly and annual fossil fuel (gasoline, diesel and compressed natural gas - CNG) consumption statistics, and estimations of bio-ethanol and bio-diesel use. Although bio-fuel CO2 emissions are considered balanced over annual (or multi-annual) agricultural cycles, we included them since CO2 generated by their combustion would be measurable by a net flux monitoring system. For the disaggregation methodology, we used information on Bogota's road network classification, mean travel speed and trip length for each vehicle category and road type. The CO2 emission factors were taken from recent in-road measurements for gasoline- and CNG-powered vehicles and also estimated from COPERT IV. We estimated emission factors for diesel from surveys on average trip length and fuel consumption. Using IPCC's reference method, we estimate Bogota's total transport-related CO2 emissions for 2008 (reference year) at 4.8 Tg CO2. The disaggregation method estimation is

  8. [DIFFERENCES IN PHYSICAL ACTIVITY AND IN PHYSICAL CONDITION BETWEEN SCHOOL AGE STUDENTS OF TWO PUBLIC CURRICULUM PROGRAMS IN BOGOTA, COLOMBIA].

    Science.gov (United States)

    Carrillo Cubides, Raúl; Aldana Alarcón, Luis Gonzalo; Gutiérrez Galvis, Adriana Rocío

    2015-11-01

    During the past five decades there has been an increased in the prevalence of obesity and over weight, also in physical inactivity and /or low cardiorespiratory fitness within the population in school age from diverse regions of the planet, including Bogota-Colombia. The general objective of this study was to compare the physical condition and the levels of physical activity from students who belonged to two curriculum programs of the Public Schools Network from Bogota, one of which includes two sessions per week, each session of 90 minutes of physical activity. We developed a research of unlike cross-sectional groups. There were 178 children evaluated from the regular curriculum and 170 kids belonging to the program 40 x 40. The physical condition was evaluated applying the protocol of high priority from the ALPHA -Fitness test Battery. The weight, height, body mass index, the waist circumference, the standing long jump, the handgrip in both hands and the motor fitness 20 meter shuttle run test were developed under standardized conditions. The Global School Health Survey (GSHS) was used to evaluate the levels of AF. No significant statistical differences were founded between P-40x40 and the regular curriculum regarding: weight, height, the body mass index, the waist circumference, the handgrip in both hands and the explosive strength in lower limbs. Nevertheless the cardiorespiratory fitness was significantly lower within de P-40x40. In conclusion the participation in the curricular program 40 x 40 was not associated with better levels of physical condition. Copyright AULA MEDICA EDICIONES 2014. Published by AULA MEDICA. All rights reserved.

  9. Findings on education in Bogota (Colombia based on a 2014 multipurpose survey

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    Sandra Patricia Barragán Moreno

    2017-06-01

    Full Text Available This paper presents a study on education of the Multipurpose Survey of the year 2014, financed by the District Department of Planning of the city of Bogotá and developed by the National Statistics Department. This study focuses on determining the main reasons why people of school age did not do so at the time of the survey, and in characterizing the educational levels of household heads and their spouses or partners as referring adults in the households surveyed. The survey was applied to a sample of 61,725 people, who according to the sample design represent 7,794,463 inhabitants of urban areas in Bogota. Using descriptive and data mining techniques, it is stated that the two main reasons for not studying are the lack of money and the need to work. In addition, marital status is a more determinant predictor than sex or socioeconomic stratum. Single people are motivated to earn a college degree when they have had access to higher education at some point in their life. When studying the information of household heads, a similar behavior was observed, because the reasons for not studying were practically the same. Unplanned pregnancy and living with a partner are not outstanding reasons.

  10. Where Latin Americans are physically active, and why does it matter? Findings from the IPEN-adult study in Bogota, Colombia; Cuernavaca, Mexico; and Curitiba, Brazil.

    Science.gov (United States)

    Salvo, Deborah; Sarmiento, Olga L; Reis, Rodrigo S; Hino, Adriano A F; Bolivar, Manuel A; Lemoine, Pablo D; Gonçalves, Priscilla B; Pratt, Michael

    2017-10-01

    Latin America (LA) has a unique structural, political, cultural and social environment. This study aimed to identify the places where Latin American adults are physically active; and to determine the association of using public- and restricted-access places with physical activity (PA). We used data from the International PA Environment Network study in Bogota, Colombia (n=1000, accelerometry=249); Cuernavaca, Mexico (n=677, accelerometry=652); and Curitiba, Brazil (n=697, accelerometry=331) (2010-2011). Walking and moderate-to-vigorous PA for leisure were measured with the International Physical Activity Questionnaire. Overall PA and PA within 10-minute bouts were measured with accelerometers. Participants reported use of public- and restricted-access places for PA. Mixed-effects regression models were used to determine the association of using public- and restricted-access places with PA. The streets were the most frequently-reported place for PA, and walking was the most common PA in the studied places. 'Informal', non-exercise-or-sports places (e.g., shopping malls) ranked high for use for PA in Bogota and Cuernavaca. In Curitiba, use of 'formal' places for sports/exercise (e.g., gyms) was more prevalent. Using public-access places was directly related to walking for leisure in all cities, and to additional PA outcomes in Bogota and Cuernavaca. In Cuernavaca and Curitiba, using restricted-access places was also associated with PA. Our study highlights the importance of public-access places for PA in LA. In some contexts, places for social interaction may be as important for PA as places for exercise/sport. Strategies increasing the availability, accessibility and quality of these places may effectively promote PA in LA. Copyright © 2016 Elsevier Inc. All rights reserved.

  11. Assessing the effect of physical activity classes in public spaces on leisure-time physical activity: "Al Ritmo de las Comunidades" A natural experiment in Bogota, Colombia.

    Science.gov (United States)

    Torres, Andrea; Díaz, María Paula; Hayat, Matthew J; Lyn, Rodney; Pratt, Michael; Salvo, Deborah; Sarmiento, Olga L

    2017-10-01

    The Recreovia program provides free physical activity (PA) classes in public spaces in Bogota, Colombia. The purpose of this study was to assess the effectiveness of the Recreovia program in increasing PA among users of nine parks in Bogota. This study was a natural experiment conducted between 2013 and 2015 in Bogota. Community members and park users living nearby three groups of parks were compared: Group 1 were parks implementing new Recreovias (n=3), Group 2 were control parks (n=3) without Recreovias, and Group 3 were parks with existing Recreovías. Individuals in the "intervention" group were exposed to newly implemented Recreovia programs in parks near their homes. Measurements were collected at baseline and 6-8months after the intervention started. A total of 1533 participants were enrolled in the study: 501 for the existing Recreovias (included in a cross-sectional assessment) and 1032 participants (from the new Recreovias and control parks) included in the cross-sectional and pre-post study. Most participants were low income females. Twenty-three percent of the intervention group started participating in the program. Users of existing Recreovias were significantly more active and less likely to be overweight/obese compared to new Recreovia users at baseline. No changes on PA were found when comparing the intervention and control groups. Recreovias may have potential for increasing PA at the population level in urban areas given their rapid scalability, the higher levels of PA observed among program users, and its potential to reach women, low-income, less educated populations, and the overweight and obese. Copyright © 2016 Elsevier Inc. All rights reserved.

  12. Challenges of implementing a primary health care strategy in a context of a market-oriented health care system: the experience of Bogota, Colombia.

    Science.gov (United States)

    Mosquera, Paola A; Hernández, Jineth; Vega, Román; Labonte, Ronald; Sanders, David; Dahlblom, Kjerstin; San Sebastián, Miguel

    2014-01-01

    Although Colombia has a health system based on market and neoliberal principles, in 2004, the government of the capital-Bogota-took the decision to formulate a health policy that included the implementation of a comprehensive primary health care (PHC) strategy. This study aims to identify the enablers and barriers to the PHC implementation in Bogota. The study used a qualitative multiple case study methodology. Seven Bogota's localities were included. Eighteen semi-structured interviews with key informants (decision-makers at each locality and members of the District Health Secretariat) and fourteen FGDs (one focus group with staff members and one with community members) were carried out. Data were analysed using a thematic analysis approach. The main enablers found across the district and local levels showed a similar pattern, all were related to the good will and commitment of actors at different levels. Barriers included the approach of the national policies and a health system based on neoliberal principles, the lack of a stable funding source, the confusing and rigid guidelines, the high turnover of human resources, the lack of competencies among health workers regarding family focus and community orientation, and the limited involvement of institutions outside the health sector in generating intersectoral responses and promoting community participation. Significant efforts are required to overcome the market approach of the national health system. Interventions must be designed to include well-trained and motivated human resources, as well as to establish available and stable financial resources for the PHC strategy. © 2013 The Authors. International Journal of Health Planning and Management published by John Wiley & Sons, Ltd.

  13. Normative reference values for the 20 m shuttle‐run test in a population‐based sample of school‐aged youth in Bogota, Colombia: the FUPRECOL study

    Science.gov (United States)

    Palacios‐López, Adalberto; Humberto Prieto‐Benavides, Daniel; Enrique Correa‐Bautista, Jorge; Izquierdo, Mikel; Alonso‐Martínez, Alicia; Lobelo, Felipe

    2016-01-01

    Abstract Objectives Our aim was to determine the normative reference values of cardiorespiratory fitness (CRF) and to establish the proportion of subjects with low CRF suggestive of future cardio‐metabolic risk. Methods A total of 7244 children and adolescents attending public schools in Bogota, Colombia (55.7% girls; age range of 9–17.9 years) participated in this study. We expressed CRF performance as the nearest stage (minute) completed and the estimated peak oxygen consumption (V˙O2peak). Smoothed percentile curves were calculated. In addition, we present the prevalence of low CRF after applying a correction factor to account for the impact of Bogota's altitude (2625 m over sea level) on CRF assessment, and we calculated the number of participants who fell below health‐related FITNESSGRAM cut‐points for low CRF. Results Shuttles and V˙O2peak were higher in boys than in girls in all age groups. In boys, there were higher levels of performance with increasing age, with most gains between the ages of 13 and 17. The proportion of subjects with a low CRF, suggestive of future cardio‐metabolic risk (health risk FITNESSGRAM category) was 31.5% (28.2% for boys and 34.1% for girls; X2 P = .001). After applying a 1.11 altitude correction factor, the overall prevalence of low CRF was 11.5% (9.6% for boys and 13.1% for girls; X2 P = .001). Conclusions Our results provide sex‐ and age‐specific normative reference standards for the 20 m shuttle‐run test and estimated V˙O2peak values in a large, population‐based sample of schoolchildren from a large Latin‐American city at high altitude. PMID:27500986

  14. Effect of size and vegetation cover in urban parks in the richness and diversity of bird life in Bogota, Colombia

    International Nuclear Information System (INIS)

    Berget, Carolina

    2006-01-01

    In one section of Bogota city some characteristics of urban recreational areas (size, distance to the east hills, coverage and diversity of vegetation) and their effects over the bird fauna diversity were studied between April and June of 2004. The samplings were made in 18 recreational areas of different sizes (100 m2 1 300000 m2), and at different distances (1.40 km -7.0 km) from two native vegetation patches to the east hills in Bogota, which were thought to be habitat sources. Lineal regression analysis showed that bird fauna diversity is affected by the size of the recreational area and, to a lesser extent, the vegetation cover, but not by other variables. These recreational areas are not considered fragments but human made islands and, therefore, they do not contain many relict forest bird species. I concluded that the east hills are not source habitat of bird species for the urban recreational areas studied. These habitats are suitable for the establishment of species associated to open areas

  15. Medición e interpretación de vibraciones producidas por el tráfico en Bogotá D.C. Measurement and interpretation of vibrations produced by the traffic in Bogota D.C.

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    Hermes Vacca Gámez

    2011-01-01

    Full Text Available Debido al desarrollo de Bogotá (ciudad principal de Colombia y a su incremento de población, se han construido en la última década sistemas de transporte. A pesar de que estos sistemas incrementan el bienestar de los ciudadanos, el tráfico vehicular podría generar problemas de vibraciones. Estas vibraciones afectarían negativamente a las personas y a las edificaciones cercanas. Estos efectos pueden ser importantes si se presentan altos niveles de amplitud de las vibraciones. Estas vibraciones, dependen, entre otros aspectos, de las características mecánicas de los suelos. Teniendo en cuenta los planes futuros de construcción de sistemas transporte en Bogotá, se registraron vibraciones de tráfico vehicular y ferroviario en 6 sitios de Bogotá. En estos lugares se identificaron suelos típicos del estudio de microzonificación sísmica. Se hicieron mediciones para registrar las vibraciones debidas al tren de la sabana, Transmilenio (buses articulados y servicio público principalmente. Se determinaron curvas de atenuación en aceleración y velocidad. Se determinó que para las condiciones actuales las vibraciones pueden llegar a ser molestas para las personas pero no generan problemas a las estructuras. No obstante, estos valores deben tomarse como punto de referencia de mediciones futuras cuando se incremente el tráfico, el peso de los vehículos (metro y las velocidades de circulación.Due to the development of Bogota (main city of Colombia and to its increase of population, transport systems have been constructed in the last decade. Although these systems increase the well-being of the citizens, the traffic could generate vibrations problems. These vibrations could affect the people and the constructions near to highways. These effects can be important for high levels of vibrations. These vibrations, depend, among others aspects, of the mechanical characteristics of the soils. Considering the future plans of construction of

  16. Effect of particulate matter less than 10μm (PM10 on mortality in Bogota, Colombia: a time-series analysis, 1998-2006

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    Luis Camilo Blanco-Becerra

    2014-07-01

    Full Text Available Objective. To analyze the association between daily mortality from different causes and acute exposure to particulate matter less than 10 microns in aerodynamic diameter (PM10, in Bogota, Colombia. Materials and methods. A time-series ecological study was conducted from 1998 to 2006. The association between mortality (due to different causes and exposure was analyzed using single and distributed lag models and adjusting for potential confounders. Results. For all ages, the cumulative effect of acute mortality from all causes and respiratory causes increased 0.71% (95%CI 0.46-0.96 and 1.43% (95%CI 0.85-2.00, respectively, per 10μg/m3 increment in daily average PM10 with a lag of three days before death. Cumulative effect of mortality from cardiovascular causes was -0.03% (95%CI -0.49-0.44% with the same lag. Conclusions. The results suggest an association between an increase in PM10 concentrations and acute mortality from all causes and respiratory causes.

  17. Conciliation of top-down and bottom-up methodologies to estimate mobile source emissions in Bogota, Colombia

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    Luis Gabriel Carmona Aparicio

    2016-09-01

    Full Text Available Aim: This study presents the reconciliation of inventories of mobile emission in Bogota in 2013, applying top-down and bottom-up methodologies. Method: It was conducted  a comparison of emissions from different vehicle categories as well as the geographical and temporal distribution of them, by creating a processing code in JAVA. The process employed the largest amount of information available from the authorities of the Capital District, and previous studies. The innovation of this research is the estimation of the traffic flows in secondary roads. It was made from an algorithm that considers road geometry, interaction between arterial and secondary roads, and legal restrictions on traffic. Results: The results show the estimated emissions for pollutants CO, CO2, VOCs, NOx, SO2 and PM, and its comparison with other studies for the city. The values obtained can be classified as minimum and maximum references of the emissions generated in 2013, due to data uncertainty. Conclusions: The project provides an upmost useful tool as input for the authorities in order to identify areas with significant emissions and to develop strategies for emissions reduction, towards improving the air quality of citizens. This method can be replicated in the generation of protocols for estimating emissions from mobile sources but results need to be carefully reviewed given the quality of information sources.

  18. Rate Proposal for Remuneration of Air Pollutants Emissions From Stationary Sources Located in Bogota D.C.

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    Gabriel Herrera Torres

    2011-04-01

    Full Text Available The objective of this project is to develop a methodological proposal for the establishment of the retributive rate for the direct use of the atmosphere as the receptor of pollutant emissions that come from stationary resources on Bogotá D.C. By means of the emissions from stationary sources inventory and the air quality analysis, the pollutant that are emitted by the industries and the ones that are regulated by the network observations of the were identified selecting the particulated matter (PM10, sulfur oxides (SOx, and nitrogen oxides (NOx as the atmospheric pollutants that should be the object of payment in the retributive rate. Besides the selection of the pollutants that should be in the payment, the analysis of the retributive rate structure was made witch was based on the description or four key elements the generated fact, the tax base, the passive subject, and the fee of the rate. taking into account the social costs which are related to the investment being made by the district for the treatment of patients that present acute respiratory diseases ERA´s, associated and the costs of program control and monitoring of the air quality in Bogotá, the tariffs of the payment of the retributive rate were redefined in 281 $/Kg for the PM10, 2816 $/kg for the SOX and 2866 $/kg for NOX. Finally a new model of the payment was established, which is the result of the multiplication of the respective tariff for each of the pollutants that were selected as object of payment, expressed in ($/kg times, the charge of the pollutants emitted by the source expressed in (kg/ day.times the total number of days of the operation of the source emissions in a year.

  19. Building a common sense within the human resource management department of a university hospital in Bogota, Colombia

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    Hernán Camilo Pulido-Martínez

    2011-05-01

    Full Text Available Around the world, healthcare organizations have had to accommodate tonational and international regulations governing work and health. This process has been accompanied by the introduction of knowledge and practices coming from social and administrative sciences. In this encounter between the liberal reforms and the particular ways of managing the workforce, the circulating meanings play an important role because, to a large extent, the agendas, programs and interventions geared to towards workforce management depend on these circulating meanings to succeed. In this paper, meanings about work, worker, organization, human resources management and hiring that are currently circulating in a human resources department of a university hospital in Bogotá, Colombia, are presented. The qualitative design used in this paper aimed to collect the circulating meanings as wellas their emotional correlative elements.

  20. The management of water providing strategic ecosystems. The case of the basins that supply Medellin and Bogota in Colombia

    International Nuclear Information System (INIS)

    Cardenas Agudelo, Maria Fernanda

    2013-01-01

    The population growth and the urban concentration involve a sustained increment in water demand, which requires an adequate effort and management of the ecosystems that provide the liquid to guarantee a plenty future offer. The performance of the entities in charge of the management of such ecosystems and the results obtained in the basins that supply drinkable water to two cities in Colombia are analyzed; financial topics and their relation with the local community are considered. Management is delegated to governmental entities, whose work is insufficient and unsatisfactory. Thus, application of economical, legal and social tools is proposed in order to improve ecosystem's conservation and life quality of farmers that inhabit in their influence areas, partially transferring management to the local community's orbit.

  1. Uso de hierbas medicinales en mujeres gestantes y en lactancia en un hospital universitario de Bogotá (Colombia The use of herbal medicine among pregnant and lactating women attending a university hospital in Bogota, Colombia

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    Gloria Paulina Pulido Acuña

    2012-12-01

    Full Text Available Las mujeres durante la gestación y lactancia utilizan diferentes hierbas y es escasa la información en el ámbito clínico en Colombia. Objetivo: Describir las prácticas relacionadas con el uso de hierbas en mujeres gestantes y en lactancia del Hospital de San José, Bogotá (Colombia. Metodología: Estudio de corte transversal. Con un cuestionario estructurado se indagó el uso, la frecuencia, el modo y razones de uso, de las hierbas medicinales y de quién se aprendió la práctica. Resultados: El uso de hierbas en mujeres gestantes y en lactancia fue de 33.6% (IC95%: 29.2% - 38% y 36.6% (IC95%: 30.8% - 42.3%, respectivamente. En el grupo de gestantes la hierba más usada fue la manzanilla (36.7% y en las mujeres en lactancia fue el hinojo (65%. Conclusión: Las mujeres gestantes y en lactancia, utilizan hierbas para las molestias del embarazo, acelerar el parto, disminuir el frío y promover la producción de leche.The use of herbal supplements is a common practice about pregnant and lactating women, however in Colombia there is limited data regarding the extent of women's use of herbal medicines during pregnancy and breastfeeding. The aim of this study was to describe the patterns of herbal medication use among pregnant and lactating women at the Hospital San Jose in Bogota, Colombia. Methods: Cross-sectional study. A questionnaire was designed to measure the frequency of herbal supplementation, why women took the herbal medicine, form of supplements, and who recommended the supplements or how did they learn about the herbal supplements. Results: The use of herbal supplements among pregnant and lactating women is 33.6% (CI 95%: 29.2%-38% and 36.6 (CI 95%: 30.8%-42.3%, respectively. The most common supplement used by pregnant women is Chamomile (36,7%, and among lactating women is Fennel (Foeniculum vulgare (65%. Conclusion: Pregnant and breastfeeding women use herbal supplements for specific pregnancy-related problems, to induce labor, to

  2. HIV knowledge and risk behaviors among women in law enforcement in Bogota, Colombia: potential role as community educators.

    Science.gov (United States)

    Míguez-Burbano, María Jose; de Pool, Ivette; Hadrigan, Sonya; Jackson, Jimmey; Angarita, Ivan; Then, Eddy Perez; Burbano, Ximena; Shor-Posner, Gail

    2005-09-01

    As HIV infection is increasing among women, evaluation, prevention, and education campaigns need to target this vulnerable population. Because of their frequent and accepted contact with members of the community, female law officers, if knowledgeable, could be well suited to provide information/education related to HIV/STD transmission. A survey of HIV/AIDS knowledge and risk behaviors was administered to 120 law enforcement women (LEW) and 60 women from the general population (GPW) in Bogotá, Colombia. LEW indicated a very high (90%) understanding of basic HIV knowledge. Although most (52%) of the LEW did not report high-risk behaviors, 29% indicated having unprotected sex during menses, and 17% had unprotected anal sex. This contrasts, however, with GPW, who were of similar age, but had a significantly higher prevalence (73%) of risky behaviors (P=.004). Moreover, 52% of the GPW reported having unprotected anal sex, and approximately half of this group (55%) indicated having unprotected sex during menses. Alcohol and drug users were also more prevalent in the GPW: 14% frequently used alcohol and 3% inhaled drugs during sexual encounters, contrasted to 2% of LEW reporting alcohol use. GPW were four times more likely than LEW, to engage in high-risk sexual practices [95% confidence interval (CI)=1.9-10.4, P=0.034]. Multivariate analyses indicated that alcohol and/or drug use were significantly associated with high-risk sexual practices [odds ratio (OR)=4.7, 95% confidence intervals (CI)=1.3-18.4, P=.02). Improved educational HIV/AIDS programs are needed, particularly for women in the general population, who use alcohol/drugs during sexual encounters, which account, at least in part, for their high-risk behaviors. Women in law enforcement, who appear knowledgeable and exhibit safer behaviors, could be useful educators for GPW. Because of their professional role in the community, training for LEW in HIV/AIDS education/prevention programs should be considered.

  3. Elaboration of a velocity model of the Bogota basin (Colombia) based on microtremors arrays measurements, gravity data, and geological information

    Science.gov (United States)

    Pulido Hernandez, N. E.; Senna, S.; Garcia, H. Mr; Montejo, S.; Reyes, J. C.

    2017-12-01

    Bogotá, a megacity with almost 8 million inhabitants is prone to a significant earthquake hazard due to nearby active faults as well as subduction megathrust earthquakes. The city has been severely affected by many historical earthquakes in the last 500 years, reaching MM intensities of 8 or more in Bogotá. The city is also located at a large lacustrine basin composed of extremely soft soils which may strongly amplify the ground shaking from earthquakes. The basin extends approximately 40 km from North to South, is bounded by the Andes range to the East and South, and sharply deepens towards the West of Bogotá. The city has been the subject of multiple microzonations studies which have contributed to gain a good knowledge on the geotechnical zonation of the city and tectonic setting of the region. To improve our knowledge on the seismic risk of the city as one of the topics, we started a 5 years project sponsored by SATREPS (a joint program of JICA and JST), entitled "Application of state of the art technologies to strengthen research and response to seismic, volcanic and tsunami events and enhance risk management in Colombia (2015-2019)". In this paper we will show our results for the elaboration of a velocity model of the city. To construct a velocity model of the basin we conducted multi-sized microtremors arrays measurements (radius from 60 cm up to 1000 m) at 41 sites within the city. We calculated dispersion curves and inferred velocity profiles at all the sites. We combine these results with gravity measurements as well as geological information to obtain the initial velocity model of the basin. Ackowledgments This research is funded by SATREPS (a joint program of JICA and JST).

  4. The biodiversity from Bogota

    International Nuclear Information System (INIS)

    Calvachi Zambrano, Byron

    2002-01-01

    It is about the flora biodiversity and fauna that it occupied the savannah of Bogota originally, about the flora and extinct fauna and of the flora and fauna that still persist in spite of the colonization

  5. Chemical composition and source apportionment of PM10at an urban background site in a high-altitude Latin American megacity (Bogota, Colombia).

    Science.gov (United States)

    Ramírez, Omar; Sánchez de la Campa, A M; Amato, Fulvio; Catacolí, Ruth A; Rojas, Néstor Y; de la Rosa, Jesús

    2018-02-01

    Bogota registers frequent episodes of poor air quality from high PM 10 concentrations. It is one of the main Latin American megacities, located at 2600 m in the tropical Andes, but there is insufficient data on PM 10 source contribution. A characterization of the chemical composition and the source apportionment of PM 10 at an urban background site in Bogota was carried out in this study. Daily samples were collected from June 2015 to May 2016 (a total of 311 samples). Organic carbon (OC), elemental carbon (EC), water soluble compounds (SO 4 2- , Cl - , NO 3 - , NH 4 + ), major elements (Al, Fe, Mg, Ca, Na, K, P) and trace metals (V, Cd, Pb, Sr, Ba, among others) were analyzed. The results were interpreted in terms of their variability during the rainy season (RS) and the dry season (DS). The data obtained revealed that the carbonaceous fraction (∼51%) and mineral dust (23%) were the main PM 10 components, followed by others (15%), Secondary Inorganic Compounds (SIC) (11%) and sea salt (0.4%). The average concentrations of soil, SIC and OC were higher during RS than DS. However, peak values were observed during the DS due to photochemical activity and forest fires. Although trace metals represented <1% of PM 10 , high concentrations of toxic elements such as Pb and Sb on RS, and Cu on DS, were obtained. By using a PMF model, six factors were identified (∼96% PM 10 ) including fugitive dust, road dust, metal processing, secondary PM, vehicles exhaust and industrial emissions. Traffic (exhaust emissions + road dust) was the major PM 10 source, accounting for ∼50% of the PM 10 . The results provided novel data about PM 10 chemical composition, its sources and its seasonal variability during the year, which can help the local government to define control strategies for the main emission sources during the most critical periods. Copyright © 2017 Elsevier Ltd. All rights reserved.

  6. A new case of alert about a possible menace to native fauna of amphibians in Colombia: first report of the bull frog (Lithobates catesbeianus) in the savanna of Bogota

    International Nuclear Information System (INIS)

    Mueses Cisneros, Jhon Jairo; Ballen, Gustavo

    2007-01-01

    Two specimens of bullfrog (Lithobates catesbeianus) in two different localities of Bogota are reported. Knowing the devastating effect that this species produces to the native populations of amphibians where it is introduced, we warn of the possible danger that the species of amphibians of the sabana of Bogota can suffer if no controls on the management and trade of this species are done

  7. Bogota - Urban Expansion Social Segregation and Land Degradation

    Science.gov (United States)

    Czerny, Mirosława; Czerny, Andrzej

    2016-01-01

    Colombia's capital city Bogota was founded in 1538 by Gonzalo Jiménez de Quesada, a Spanish Conquistador who came down from the north to reach the Sabana de Bogotá, i.e. the intermountain plateau (and "Savannah") around Bogota. The whole region was already well-developed by then, and inhabited by the Muisca people. Their settlements were dispersed across the plateau, though only rarely did these encompass flat areas suitable for crop-growing. Today's Bogota is the largest metropolitan area in the country, with more than 8 million residents currently, and occupying a considerable part of the extensive high plateau. Processes which have resulted in Bogota's present spatial form and its - in some ways - unique functional and spatial structure, are manifold, and highly complex. They include environmental, political, social and economic factors. Nevertheless, among all of these cause-and-effect processes, institutionalized segregation (called estratificación in Colombia) is the reason why rigid spatial structures are maintained, while the spontaneous and uncontrolled movement of groups of people within the city and from one social class to another is restricted.

  8. Triceps and Subscapular Skinfold Thickness Percentiles and Cut-Offs for Overweight and Obesity in a Population-Based Sample of Schoolchildren and Adolescents in Bogota, Colombia

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    Robinson Ramírez-Vélez

    2016-09-01

    Full Text Available The assessment of skinfold thickness is an objective measure of adiposity. The aims of this study were to establish Colombian smoothed centile charts and LMS L (Box–Cox transformation, M (median, and S (coefficient of variation tables for triceps, subscapular, and triceps + subscapular skinfolds; appropriate cut-offs were selected using receiver operating characteristic (ROC analysis based on a population-based sample of children and adolescents in Bogotá, Colombia. A cross-sectional study was conducted in 9618 children and adolescents (55.7% girls; age range of 9–17.9 years. Triceps and subscapular skinfold measurements were obtained using standardized methods. We calculated the triceps + subscapular skinfold (T + SS sum. Smoothed percentile curves for triceps and subscapular skinfold thickness were derived using the LMS method. ROC curve analyses were used to evaluate the optimal cut-off point of skinfold thickness for overweight and obesity, based on the International Obesity Task Force definitions. Subscapular and triceps skinfolds and T + SS were significantly higher in girls than in boys (p < 0.001. The ROC analysis showed that subscapular and triceps skinfolds and T + SS have a high discriminatory power in the identification of overweight and obesity in the sample population in this study. Our results provide sex- and age-specific normative reference standards for skinfold thickness values from a population from Bogotá, Colombia.

  9. Triceps and Subscapular Skinfold Thickness Percentiles and Cut-Offs for Overweight and Obesity in a Population-Based Sample of Schoolchildren and Adolescents in Bogota, Colombia

    Science.gov (United States)

    Ramírez-Vélez, Robinson; López-Cifuentes, Mario Ferney; Correa-Bautista, Jorge Enrique; González-Ruíz, Katherine; González-Jiménez, Emilio; Córdoba-Rodríguez, Diana Paola; Vivas, Andrés; Triana-Reina, Hector Reynaldo; Schmidt-RioValle, Jacqueline

    2016-01-01

    The assessment of skinfold thickness is an objective measure of adiposity. The aims of this study were to establish Colombian smoothed centile charts and LMS L (Box–Cox transformation), M (median), and S (coefficient of variation) tables for triceps, subscapular, and triceps + subscapular skinfolds; appropriate cut-offs were selected using receiver operating characteristic (ROC) analysis based on a population-based sample of children and adolescents in Bogotá, Colombia. A cross-sectional study was conducted in 9618 children and adolescents (55.7% girls; age range of 9–17.9 years). Triceps and subscapular skinfold measurements were obtained using standardized methods. We calculated the triceps + subscapular skinfold (T + SS) sum. Smoothed percentile curves for triceps and subscapular skinfold thickness were derived using the LMS method. ROC curve analyses were used to evaluate the optimal cut-off point of skinfold thickness for overweight and obesity, based on the International Obesity Task Force definitions. Subscapular and triceps skinfolds and T + SS were significantly higher in girls than in boys (p < 0.001). The ROC analysis showed that subscapular and triceps skinfolds and T + SS have a high discriminatory power in the identification of overweight and obesity in the sample population in this study. Our results provide sex- and age-specific normative reference standards for skinfold thickness values from a population from Bogotá, Colombia. PMID:27669294

  10. Determination of Magnitude and Location of Earthquakes With Only Five Seconds of a Three Component Broadband Sensor Signal Located Near Bogota, Colombia Using Support Vector Machines

    Science.gov (United States)

    Ochoa Gutierrez, L. H.; Vargas Jiménez, C. A.; Niño Vasquez, L. F., Sr.

    2017-12-01

    Early warning generation for earthquakes that occur near the city of Bogotá-Colombia is extremely important. Using the information of a broadband and three component station, property of the Servicio Geológico Colombiano (SGC), called El Rosal, which is located very near the city, we developed a model based on support vector machines techniques (SVM), with a standardized polynomial kernel, using as descriptors or input data, seismic signal features, complemented by the hipocentral parameters calculated for each one of the reported events. The model was trained and evaluated by cross correlation and was used to predict, with only five seconds of signal, the magnitude and location of a seismic event. With the proposed model we calculated local magnitude with an accuracy of 0.19 units of magnitude, epicentral distance with an accuracy of about 11 k, depth with a precision of approximately 40 km and the azimuth of arrival with a precision of 45°. This research made a significant contribution for early warning generation for the country, in particular for the city of Bogotá. These models will be implemented in the future in the "Red Sismológica de la Sabana de Bogotá y sus Alrededores (RSSB)" which belongs to the Universidad Nacional de Colombia.

  11. Ácidos grasos, vitamina e y rotulado nutricional de margarinas y esparcibles comercializados en Bogotá, Colombia Fatty acids, vitamin E and nutritional labeling of margarines and spreads commercialized in Bogota, Colombia

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    Lorena A Bolívar C

    2010-06-01

    Full Text Available INTRODUCCIÓN: en Colombia es escasa la información sobre el contenido de ácidos grasos y vitaminas en margarinas y esparcibles comercializados en el ámbito local. OBJETIVO: analizar el perfil de ácidos grasos y de vitamina E de las margarinas y esparcibles más comercializados en Bogotá, Colombia, y su situación actual de rotulado nutricional según la Resolución 0288 de 2008. MATERIALES Y MÉTODOS: en 2008 se realizó un conteo de caras de las margarinas y esparcibles más comercializados en supermercados de cadena de cinco localidades de Bogotá que incluyeron diferentes estratos socioeconómicos, y se escogieron las primeras diecisiete marcas comerciales y tres marcas propias para el estudio. De cada producto se tomaron y analizaron cinco repeticiones, una por localidad, entre agosto y noviembre de 2008. RESULTADOS: los ácidos grasos mayoritarios son palmítico, oleico y linoleico, y cuatro productos son fuente de ácidos grasos trans (4,4 g y 6,9 g/100 g. El contenido de vitamina E varía de 2,3 mg a 39,9 mg/100 g de producto. De 74,3% a 96,2% de los nutrientes de declaración obligatoria son efectivamente declarados en la etiqueta de los productos analizados. RESULTADOS: 91% de las margarinas y esparcibles más comercializados en cinco localidades de Bogotá en agosto de 2008 es libre de ácidos grasos trans (INTRODUCTION: information on the content of fatty acids and vitamins in margarines and spreads locally commercialized in Colombia is scarse. OBJECTIVE: analyze the fatty acids and vitamin E profile in margarines and spreads most commercialized in Bogotá, Colombia and its current nutritional labeling under Resolution 0288 of 2008. MATERIALS AND METHODS: a counting of labels of margarines and spreads most commercialized in chain supermarkets of five localities in Bogotá that included different socio-economical strata, was made. The first seventeen trademarks and three study brand marks were chosen for the study. Five samples

  12. Towards programs for alcohol consumption prevention in college students in Bogota, Colombia [Elementos para programas de prevención en consumo de alcohol en universitarios en Bogotá, Colombia

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    María Liliana Muñoz Ortega

    2012-03-01

    Full Text Available This non–experimental study, aimed to propose from university students items for prevention programs of alcohol consumption obtain by examining levels, situations and characteristics of alcohol consumption of 2910 students in ten universities of Bogotá – Colombia who answered the features tab in consumption, the Ceal and the Isca, participating in 15 focus groups, 80 students. Consumption is high, begins at early ages, approved by parents, associated by academic pressures loneliness and culture. There are indexes of abuse and dependence. The situations associated with consumption are emotions and good times, the urge to consume and social pressure. Preventive programs should be implemented by youth-oriented, responsible consumption using a variety of activities with responsibility from the actors.

  13. Largest clinic in the world? (Bogota).

    Science.gov (United States)

    1971-01-01

    The IPPF member, the Asociacion Pro-Bienestar de la Familia Colombiana (Profamilia), is discussed and its clinic, the Pilot Center in Bogota, reputed to be the largest family clinic in the world, is described. From January 1966 until the end of 1970, the Pilot Center served 59,469 new acceptors. Of the 31 Profamilia clinics in Colombia, the Pilot Center was visited by 22% of all new acceptors during 1970. Profamilia established the first vasectomy clinic in Latin America in February 1970. By the end of 1970, 92 vasectomies had been performed. Profamilia has expanded its family planning program, and part of this expansion is a result of Profamilia's extensive use of mass media in its education campaign. In 1970, there was a 24% increase in new acceptors over 1969 and a 66% increase in follow-up visits. 62,292 radio spots and 7 television programs were broadcast and announcements about family planning were shown in public cinemas in the latter half of 1970. Nearly 300,000 women attended talks, meetings, and film shows on family planning, and approximately 2 million leaflets and information sheets were distributed. To increase community involvement, Profamilia held 26 short courses for various groups including religious and community leaders. Profamilia also conducted a training course for doctors and sociologists from Colombia and other Latin American countries.

  14. MODELACIÓN HIDROLÓGICA DEL HUMEDAL DE JABOQUE – BOGOTÁ, D.C. (COLOMBIA

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    Beltrán Julio

    2013-07-01

    Full Text Available Se propone un modelo de simulación dinámico para explicar los procesos hidrológicosdel humedal Jaboque – Bogotá D.C., Colombia, en tres secciones con característicasfísicas y químicas particulares. El modelo incluye los caudales de entrada y salidade agua para cada una de las secciones del humedal. La modelación dinámica sebasó en ecuaciones diferenciales. Se utilizó el método Euler de integración con elprograma computacional Stella 9.1®. El comportamiento hidrológico del humedaltiene una alta dependencia de los aportes de la cuenca aferente que a su vez obedecenfundamentalmente a las condiciones climáticas de la cuenca. En el año 1992 (añoNiño la precipitación fue 432.7 mm/año con una descarga de agua estimada de lacuenca aferente de 905 225 m3/año, siendo el valor más bajo en los últimos 39 años.En el 2010 (año Niña la precipitación anual fue de 1251.3. mm, con una descargade la cuenca aferente de 2 471 634 m3/año, que corresponde al dato más alto para elmismo periodo. La comparación entre los caudales de entrada y salida del humedalJaboque muestran una diferencia bruta de 82 165 m3/mes para un total anual de 985980 m3/año. El tiempo hidráulico de retención modelado (THR se estimó en quincepara la primera sección, 36 y 42 días para la segunda y tercera sección. El promedioen el humedal fue de 93 días/año. El análisis de sensibilidad mostró que entre loslimites de 800 mm/año y 900 mm/año, valores entre los cuales oscila el promediomultianual de la precipitación, el comportamiento del THR es de 13 a 15 días/año enla primera sección, en la segunda de 32 a 36 días/año y la tercera de 38 a 43 días. Secorrobora así la relación que existe entre la precipitación y los factores morfométricosdel humedal.

  15. Colombia.

    Science.gov (United States)

    1986-10-01

    This report of background notes for Colombia concentrates on political history, but also summarizes geography, people, economy, defense and foreign relations. Colombia, linking Panama to the northwest tip of South America, has 26.5 million people, growing at 1.3% per year, expected to be the third most populous nationon the continent soon. Infant mortality rate is 65/1000 and life expectancy is 62 years. Literacy is reported at 80% although less than 40% of children complete 2.5 years of school. Geographically, Colombia has flat coastal areas, several mountain ranges, highlands and hot eastern plains. 70% of the population live in cities. There are 2 major political parties, in existence since the early 19th century. Recently there have been violent inter-party differences, punctuated by even more contentious guerrilla attacks. Colombia possesses resources of oil, gas coal, nickel, gold, emeralds, platinum, iron. Agricultural products are dominated by coffee, but also include a wide variety of tropical and temperate grains, fruits, vegetables, dairy and meat products, timber and flowers.

  16. Bio indication of water quality in the Bogota Sabane using fuzzy logic sagging and aquatic micro invertebrates

    International Nuclear Information System (INIS)

    Gutierrez, Juan David; Riss Wolfgang; Ospina Rodolfo

    2002-01-01

    An application of the Sagging-type fuzzy logic to calculate biological water quality in Bogota, Colombia is presented 28 sites corresponding to 9 watersheds in the Bogota area were used. The organisms selected were: Leptoceridae and Hidrobiosidae as indicators of clean waters, Planariidae and Amphipoda as indicators of polluted waters and Psychodida and Syrphidae as indicators of highly polluted waters Chironomids were also included. In order to prove the degree of reliability of Sugeno-type fuzzy logic, the results obtained were compared with values for the Cfq index, and a highly significant correlation was obtained

  17. Selección de una tecnología de banda ancha para la Universidad Nacional de Colombia — Sede Bogota, usando una técnica de decisión multicriterio

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    Félix Antonio Cortés Aldana

    2007-01-01

    Full Text Available La Universidad Nacional de Colombia Sede Bogotá (U.N. Bogotá ha planteado un proyecto para mejorar sus servicios de acceso a Internet mediante el empleo de una tecnología de banda ancha. En una fase inicial del proyecto se ha tenido que seleccionar la tecnología más adecuada entre las cuatro disponibles en Colombia: LMDS, ADSL, Cable Modem y Fibra óptica. Para adoptar esta decisión se ha aplicado el proceso analítico le- rárquico (AHP. Este método, basado en el análisis de decisiones multicriterio (MCDA, permite establecer los criterios de decisión, ponderarlos y valorar las alternativas en función de las prioridades que el decisor establezca para cada criterio. Como apoyo en todo el proceso de decisión se ha considerado la opinión de diferentes expertos. En la presente comunicación se expone el proceso seguido con el objetivo de mostrar que el empleo de métodos basados en el análisis de decisiones multicriterio (MCDA puede resultar útil a la hora de adoptar decisiones complejas.

  18. Influences of the trees plantation in structures of Santa Fe of Bogota

    International Nuclear Information System (INIS)

    Acuna, John Fabio

    1999-01-01

    Through the project - Evaluation of damages caused by forest species planted in Santa Fe of Bogota and of the publication: Lungs for Santa Fe de Bogota; the Agricultural Engineering Department of the National University of Colombia, in collaboration with the Botanical Garden of Bogota Jose Celestino Mutis, offers to the capital a valuable contribution on trees plantation and its influence on the structures. Keeping in mind that trees are vital for any city, because they constitute a relating a fundamental for the appropriate use of the senses because forms behave, scents, colors and natural flavors in a means where the rest of the landscape is artificial. They contribute with the health when purifying the air; with the ecology and environment because they are hosts of many other forms of life, they are source of beauty, recreation and harmony, also giving a stamp of identity to the city; however, their implantation and handle, demands knowledge and cares, to assure a harmonious and lasting integration with the city

  19. El papel de los profesionales en centros de atención en drogas en ambulatorios de la ciudad de Bogotá, Colombia Papéis de profissionais, em centros de atenção ambulatorial em drogas, na cidade de Bogotá, Colômbia Roles of professionals in drug outpatient care centers, in the city of Bogota, Colombia

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    Luz Patricia Díaz Heredia

    2010-06-01

    ço dentro da equipe de atenção aos usuários de drogas.The aim of this descriptive, cross-sectional study, developed with 93 professionals, was to characterize the roles of the professionals who were working in the drug addiction outpatient centers of the city of Bogota, Colombia. The results showed that psychologists were the predominant professionals (38%, followed by occupational therapists (34%. Nurses corresponded to 8% of the professionals, with their roles predominantly in the aspects of health promotion and self care (100%, in the administrative area (43% and in prevention (57% and very little in rehabilitation and social rehabilitation (14%. The roles of the professionals agreed with the expected activities of the different professions, with the exception of the occupational therapists. It is considered that nurses need to gain more space within the team to focus on drug users.

  20. The Pact of Bogota: Cases and Practice

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    María Teresa Infante Caffi

    2017-03-01

    Full Text Available The jurisdiction of the International Court of Justice (ICJ under the Pact of Bogota (1948 is part of a system of norms attributing competenceto the referenced tribunal along with other means of settlement. The system sets out principles and general exceptions applicable to all the means of peaceful settlement embodied in the Pact. This study will topic relates to the theory of dispute settlement and treaty interpretation hemispheric politics and diplomacy.

  1. Uribe, M. (2013. La Nación Vetada. Estado, desarrollo y guerra civil en Colombia. Bogotá, D.C: Universidad Externado de Colombia, 343 pp.

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    Juan Carlos Villamizar

    2017-01-01

    Full Text Available El libro plantea una tesis sugestiva que será objeto de discusión en la futura historiografía acerca del proceso político colombiano en la segunda mitad del siglo XX: la explicación de las causas de la persistencia de la guerra civil en Colombia por cerca de sesenta años. Uribe explica cómo la sociedad colombiana ha mantenido una guerra civil prolongada desde 1964, la cual se ha configurado por la coexistencia del veto de las élites a la Nación, un estilo de desarrollo concentrador de la riqueza con sesgo anti-campesino y una adopción irrestricta de las élites a la política norteamericana. Los anteriores elementos se retroalimentan mutuamente generando una ruta, en la cual, la guerra civil es la marca distintiva.

  2. La salud en Colombia. Marcela Vélez. Bogotá, D.C.: Penguin Random House Grupo Editorial; 2016

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    Omar Segura

    2016-04-01

    Full Text Available Colombia afronta una crisis en su sistema de seguridad social en salud prácticamente desde cuando fue promulgada la Ley 100 el 20 diciembre de 1993. Casi una generación después, Marcela Vélez quiere explicar en 207 páginas la crisis de un modelo de aseguramiento, prestación de servicios y salud pública que ha resultado inadecuado para el desarrollo social y económico del país. La autora también pretende mostrar cómo este conocimiento puede servir para argumentar su rechazo al sistema y proponer cambios, ya que nuevas componendas legales disfrazadas de reforma solo empeorarán las cosas.

  3. Bogota Bag in Abdominal Compartment Syndrome at Kathmandu Model Hospital.

    Science.gov (United States)

    Joshi, Bijendra Dhoj; Koirala, Udaya; Upadhyaya, Amit M; Joshi, Arbin; Dhital, Saroj

    2017-09-08

    The gold standard of quick and definitive treatment of Abdominal compartment syndrome (ACS) is surgical decompression by opening the abdomen and leaving it open until intra-abdominal pressure decreases. Temporary abdominal closure techniques are used to postpone definite closure until predisposing factors causing pathologic elevation of intra-abdominal pressure are resolved.This study aim to analyze feasibility of Bogota Bag placement as a way of temporary abdominal closure. Cases admitted in the period of eight years that were diagnosed to have or at risk to develop ACS and managed with 'Bogota Bag', irrespective of primary diagnosis were reviewed retrospectively. Cause of ACS, reasons to place Bogota bag, its complications and final outcome in terms of mortality related or not related with Bogota Bag placement were assessed. Total of ten patients had placement of Bogota Bag in the period of eight years. Laparotomy for bowel perforation with peritonitis was the most common primary condition contributing to ACS. Bogota bag was placed in two cases after emergency decompression as a therapeutic measure whereas others were done as prophylactic measure. There were two mortalities (20%) which were not directly related to abdominal compartment syndrome. Abdomen closure with Bogota Bag for patients with ACS or likely to develop ACS is a feasible technique with minimal procedure related morbidities.

  4. Muertes por causas violentas y ciclo económico en Bogotá, Colombia: un estudio de series de tiempo, 1997-2006 Death from violent causes and economic cycles in Bogota, Colombia: a time-series study, 1997-2006

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    José Moreno Montoya

    2009-07-01

    Full Text Available OBJETIVOS: Caracterizar las tendencias temporales del número de muertes por causas violentas en la ciudad de Bogotá entre 1997 y 2006 y analizar su posible asociación con los ciclos económicos de la ciudad. MÉTODOS: Estudio ecológico a partir de las cifras absolutas de muertes violentas registradas entre enero de 1997 y septiembre de 2006 en Santa Fe de Bogotá, Colombia. Se utilizaron modelos ARIMA de series de tiempo trimestrales para caracterizar el comportamiento de las muertes violentas. Como variables explicativas del ciclo económico de la ciudad se utilizaron las series trimestrales del índice de precios al consumidor, la tasa de desempleo y el número total de personas ocupadas; se evaluó su asociación con las series de muertes mediante modelos de función de transferencia. RESULTADOS: Del total de 36575 muertes por causas violentas en Bogotá, 57,7% fueron por homicidios y 23,7% por accidentes de tránsito. Las series de homicidios, suicidios y muertes por accidentes de tránsito mostraron tendencias decrecientes, con un marcado comportamiento estacional en las series de muertes por accidentes de tránsito y suicidios, con picos en los dos últimos trimestres de cada año. Se hallaron asociaciones significativas entre todas las series de muertes por las diferentes causas con al menos una serie económica y en cada caso se identificó el modelo de función de transferencia respectivo. CONCLUSIONES: Los homicidios constituyen la mayor parte de las muertes por causas violentas y revelan la existencia de patrones temporales en este tipo de muertes. Se encontraron asociaciones significativas entre las muertes por causas violentas y algunas variables económicas que describen el ciclo de la actividad en la ciudad. Se confirmó que diferentes circunstancias socioeconómicas que afectan a una sociedad pueden influir en el nivel de violencia.OBJECTIVES: To determine seasonal trends in the number of deaths from violence in Bogot

  5. Correlación de protoporfirina zinc y plomo en sangre en trabajadores de fábricas de baterías, de Bogotá, Colombia Correlation of zinc protoporphyrin with blood lead levels in car battery industry workers in Bogota, Colombia

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    Omayda Cárdenas-Bustamante

    2001-06-01

    Full Text Available Objetivo. Determinar la utilidad de la protoporfirina zinc en sangre (PPz como indicador de exposición a plomo en trabajadores de fábricas de baterías. Material y métodos. Se hizo un estudio transversal en 116 trabajadores de fábricas de baterías del sector informal en Bogotá, Colombia. La información sobre variables generales, ocupacionales y de salud fue obtenida por medio de una entrevista con los trabajadores. Se establecieron dos categorías para los valores de PPz: aquellos por debajo del valor límite de (70 µg/dl, y aquellos por arriba de este valor. Se empleó análisis de regresión lineal para medir la correlación entre los valores logarítmicos de PPz (>70 µg/dl y plomo en sangre (PbS (>38 µg/dl. Resultados. Se encontró un coeficiente de correlación semilogarítmica r=0.54, además de posibles asociaciones estadísticamente significativas entre los niveles elevados de PPz y el oficio actual de exposición directa (RM:3.35, IC 95% 1.02-11.91; p:0.02, emplear plomo como materia prima (RM:7.80, IC 95% 2.96-21.03; phttp://www.insp.mx/salud/index.htmlObjective. To determine the usefulness of zinc protoporphyrin in blood (PPz as an indicator of lead exposure in workers of the homemade car battery industry. Material and methods. A cross-sectional study was performed in 116 workers of the car battery industry in Bogotá, Colombia. Data on general, occupational, and health variables were collected by interview. Two categories of PPz values were established: Those below the cutoff value (70 µg/dL and those above it. A linear regression analysis was performed to measure the correlation between logarithm values of PPz (>70 µg/dL and lead in blood (PbB (>38 µg/dL. Results. A semi-logarithmic correlation coefficient of r=0.54 was found, and statistically significant associations between high levels of PPz and direct exposure to lead were observed (OR:3.35, 95% IC 1.02-11.91; p:0.02; for workers who often use lead as a raw material

  6. MODELACIÓN DEL ESTADO TRÓFICO DEL HUMEDAL DE JABOQUE, BOGOTÁ D.C., COLOMBIA

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    Julio Eduardo Beltrán Vargas

    2013-01-01

    Full Text Available Se construyó un modelo de simulación dinámica con la intención de explicar el comportamiento del fósforo total en el agua y su relación con el estado trófico del humedal de Jaboque, Bogotá D. C., Colombia. En el modelo se incluyen los flujos de entrada y salida del agua y los aportes de fósforo total en cada una de las tres secciones de la cubeta con características morfométricas y condiciones físicas y químicas del agua muy diferentes. La modelación dinámica se basó en ecuaciones diferenciales y para ella se utilizó el programa computacional Stella 9.1® . En los meses con mayores caudales (época de lluvias, la carga de fósforo disminuye en las tres secciones del humedal, mientras que en los meses con menores caudales (época de sequía, la misma se incrementa. En la sección uno (tercio alto el valor del índice de estado trófico fue de 45,09 mg/m3  y el tiempo de retención hidráulica de 14 días/año. En la segunda sección (tercio medio el valor del mencionado índice fue de 35,89 mg/m3  y el THR fue de 34 días/año. Finalmente, en la tercera sección (tercio bajo los valores fueron 19,5 mg/m3  y 40 días/año respectivamente. Estos valores indican que la primera y segunda sección se encuentran en condiciones de eutrofía y la tercera de mesotrofía. El análisis de sensibilidad permitió estimar que con una carga de 0,62 mg/m3  de fósforo total se podrían mantener las condiciones de mesotrofía en la tercera sección y que para las dos primeras secciones se debería reducir la carga hasta 0,2 mg/m3, para alcanzar un estado de mesotrofía.

  7. Caracterización sociodemográfica del cuidador familiar de la persona mayor en una localidad de Bogotá-Colombia / Socio-demographic Characteristics of the Caregiver for Elderly People in a Location in Bogota-Colombia / Caracterização sociodemográfica do cuidador familiar da pessoa idosa numa região da cidade de Bogotá-Colômbia

    Directory of Open Access Journals (Sweden)

    Blanca Nieves Piratoba-Hernández, Enf., Esp., MSc.

    2015-07-01

    caregivers. [Piratoba-Hernández BN, Rozo-Gutiérrez JN. Socio-demographic characteristics of the caregiver for elderly people in a location in Bogota-Colombia. MedUNAB 2015; 18 (1: 51-57]. Introdução: O aumento da população idosa e das doenças crônicas não transmissíveis tem aumentado a procura de cuidados permanentes realizados por mulheres. O reconhecimento das características sociodemográficas permite identificar a situação vivida pelas cuidadoras. Objetivo: Caracterizar os familiares cuidadores das pessoas idosas em situação de dependência, para ajudar a desenvolver programas adaptáveis às necessidades das pessoas cuidadoras. Metodologia: Elaboração de um projeto quantitativo, descritivo e transversal de agosto de 2010 a março de 2011. A informação foi adquirida através de entrevistas domiciliares e das respostas ao questionário de caracterização sociodemográfica. A amostra intencional foi de 91 cuidadores. Para a análise estatística utilizou-se o programa SPSS em sua versão 15. Resultados: Foi evidente a faixa etária das pessoas familiares cuidadoras entre os 36 e 59 anos (53%; na sua maioria são mulheres (81%, com níveis de escolaridade fundamental ou ensino médio incompleto (45%, casados (36%, com total dedicação ao lar (53%, afiliadas ao seguro social subsidiado ou do Estado (87%. O trabalho de familiares cuidadores tem sido exercido por mais de 37 meses (87%; com uma dedicação diária de 24 horas (54% e a maioria é cuidado pelo filho (a. Estes cuidadores não têm os conhecimentos suficientes para lidar com situações negativas decorrentes da assistência às pessoas idosas. Conclusões: Características como idade, nível de escolaridade, tempo dedicado ao cuidado, rede de apoio, ocupação e status socioeconômico fazem urgente a procura de alternativas para os cuidadores que não têm os recursos para obter níveis ótimos de informação; estes resultados permitem que diferentes setores possam implementar ações e criar

  8. Terrorism in Colombia.

    Science.gov (United States)

    Paredes Zapata, Gabriel Darío

    2003-01-01

    Colombia is a poor country that has been plagued by ongoing violence for more than 120 years. During the 1940s, subversive terrorist groups emerged in rural areas of the country when criminal groups came under the influence of Communism, and were later transformed into contemporary groups, such as the Ejercito de Liberacion Nacional (ELN) or National Liberation Army and Fuerzas Armadas Revolucionares de Colombia (FARC) or Revolutionary Armed Forces of Colombia). Paramilitary terrorist groups emerged in response to subversive groups and were later transformed into contemporary groups, such as the Autodefensas Unidas de Colombia (AUC) or United Self-Defense Forces of Colombia. Terrorism has placed an enormous burden on modern Colombia. From 1995 to 2002, 9,435 people were killed by terrorism-related events, of which 5,864 were killed by subversive terrorist activities and 3,571 were killed by paramilitary terrorist activities. In 2002, at least nineteen attacks produced 10 or more casualties, of which 18 were bombings. In 2002, terrorists killed at least 12 mayors, 71 legislators, and internally displaced 300,000 persons from their homes. Since terrorist groups in Colombia are typically supported by drug manufacturing and trafficking, it has been difficult at times to distinguish violence due to terrorism from violence due to illicit drug trafficking. Terrorism has also had a major adverse effect on the economy, with restricted travel, loss of economic resources, and lack of economic investment. In addition to political, military, and commercial targets, terrorists have specifically targeted healthcare infrastructure and personnel. At the national and local levels, much emergency planning and preparedness has taken place for terrorism-related events. The Centro Regulador de Urgencias (CRU) or Emergency Regulation Center in Bogota plays a major role in coordinating local prehospital and hospital emergency response in the capital city and the national level where

  9. Identifying explanatory variables of structural state for optimum asset management of urban drainage networks: a pilot study for the city of Bogota

    Directory of Open Access Journals (Sweden)

    H Angarita

    2017-05-01

    Full Text Available The aim of this work is to identify and quantify physical and environmental explanatory variables for the structural state of urban drainage networks in a pilot study located in Bogota, Colombia. The analysis used information from 2291 CCTV inspections collected by the Water and Sewerage Company of Bogota (EAAB, from its Spanish initials using tele-operated equipment during 2008-2010. Linear regression models were established to identify the environmental and physical characteristics of the pipes that are significantly associated with the occurrence, magnitude and type of the failures commonly found. Despite the fact that the correlation levels show that the developed model has a very low predictive capacity, it was found that the process of selecting assets for CCTV inspection can be optimized, increasing the success rate in failure detection.

  10. [Detection of transgenic proteins in maize flour marketed in Bogotá, Colombia].

    Science.gov (United States)

    Tabima-Cubillos, Lizeth Y; Chaparro-Giraldo, Alejandro; Trujillo-Güiza, Martha L

    2016-06-01

    Objective To detect the presence or absence of transgenic proteins derived from GM crops in maize flour marketed in Bogota D.C., Colombia. Methods 11 extraction protocols for total protein were evaluated in 17 precooked flour, two uncooked and three positive controls. Subsequently, the presence of 7 transgenic proteins (CP4-EPSPS, Cry1Ab, Cry1Ac, Cry1F, Cry2A, Cry34Ab1 and Cry3Bb1) using commercial ELISA kits was determined. Results It was determined that the best protocol for total protein extraction was buffer with Triton X-100, which allowed obtaining protein concentrations greater than 0.5 mg per gram of flour and does not generate interference with the ELISA technique. Four transgenic proteins were detected: CP4EPSPS, Cry1F, Cry1Ab and Cry34Ab1 in precooked and uncooked flour with percentages varying between 20 and 100 %. Conclusion Seven of the 19 maize flours contain traces of transgenic protein (B2,B8,A3,O3,O1,C1 and C2) that provide resistance to lepidopterans and coleopterans, and tolerance to glyphosate herbicide, (CP4EPSPS- Cry1Ab, Cry1F, Cry34Ab1 and Cry3Bb1). All detected events are approved for human consumption in Colombia, according to the Ministry of Health and Social Protection.

  11. Correlation of global solar radiation values estimated and measured on an inclined surface for clear days in Bogota

    Energy Technology Data Exchange (ETDEWEB)

    Forero, N.L. [Licenciatura en Fisica, Universidad Distrital, Bogota (Colombia); Caicedo, L.M.; Gordillo, G. [Departamento de Fisica, Universidad Nacional de Colombia, Bogota (Colombia)

    2007-12-15

    An empirical expression developed to estimate global solar radiation in clear days, on inclined surfaces located at any geographical position, is presented. This expression allows determining the global solar radiation in a specific day of the year, considering the attenuation of radiation in the atmosphere, the air mass factor, astronomic geometric and geographic parameters, and in particular, the altitude. Data calculated with this expression were correlated with those obtained experimentally in Bogota, Colombia (74 4'W, 4 35'N and 2580 m altitude). The correlation of the calculated with the experimental data yielded a coefficient of 0.9980, which indicates the reliability of the former and that the developed expression facilitates the construction of data bases with information on solar radiation potential in ample regions characterized by their locations at different altitudes above sea level. These data bases will supply preliminary information on sites adequate for the installation of photovoltaic systems. (author)

  12. Genetic Structure of Anopheles (Nyssorhynchus) marajoara (Diptera: Culicidae) in Colombia

    Science.gov (United States)

    2010-01-01

    Salud , Bogotá DC, Colombia; Facultad de Agronomía, Universidad Nacional de Colombia, Ciudad Universitaria, Bogotá DC, Colombia; Division of Entomology...Colombia . Manual de Manejo integral de la malaria. Instituto Nacional de Salud Ed . Bogotá, Columbia: Instituto Nacional de Salud . 3. Herrera...Control Assoc 21: 182 – 186 . 7. Servicio de Erradicación de la Malaria (SEM) , 1957 . Plan de erradi- cación de la

  13. Assessment of environmental projects in official schools in the locality 18 in Bogota

    International Nuclear Information System (INIS)

    Herrera R, Juan Francisco; Reyes S, Lucia; Amaya, Hector Oswaldo T .Gerena Oscar Arturo

    2006-01-01

    It was investigated the current state of de School Environment Projects in the public educational institutions of de Town 18 Rafael Uribe Uribe in Bogota (Colombia). The participation grade was measured in the design o execution and evaluation of the environmental projects, the registration and systematising of experiences, the generation of reflection spaces and the structuring to the Institutional Educational Project. By means of the test pilot the variables were determined for the sample design and the validation of the mensuration instrument. Three populations study object were determined and for each was designed a for through which the information of the variable was gathered by means of the method of direct interview. The results show that the overwhelming majority of the considered population didn't participated in the design in the execution of the environmental projects. The registration and systematizing of experiences are minimum, as well as the reflection spaces and conceptualization. There is not articulation from the environmental project to the Institutional Educational Project. The little participation, systematizing of experiences and lack of reflection spaces and conceptualization limit the impact of the School Environmental Projects in the formation of favorable attitudes to the environment

  14. On the Threshold of Colombian Modern Art: the French Exhibition of 1922 in Bogota and Medellin

    Directory of Open Access Journals (Sweden)

    Carlos Arturo Fernández Uribe

    2017-01-01

    Full Text Available This article intends to make a analysis of the development of french exhibition in Colombia during 1922. Its was particularly important in the advancement of modern artistic taste at home and became a vital link in the advance of modern art in the country. The article will analyze the objectives of the exhibition and guiding concepts marked by the event organizers. Then,  it will  establish a comparative study of the circumstances and the effects that the exhibition had in  the two cities which welcomed them: Bogota and Medellin. In the first city, the exhibition produced a significant number of critical reflections and modern taste had the acceptance of a connoisseur group. In the case of Medellin, the exhibition was preceded by a series of explanatory texts in a local magazine. These texts showed a vision influence by the artistic conservatism and they did not indicate precisely the implications of trends involving the exhibition. The reception and the consequences of its display were different in both cities which shaped a different development of modern art in each city.

  15. Nuclear Medicine week in Colombia

    International Nuclear Information System (INIS)

    Padhy, A.K.

    2003-01-01

    During the week of 6-12 October 2003 the IAEA organized a Research Coordination Meeting on 'Relationship between lower Respiratory Tract Infection, Gastroesophageal reflux and bronchial Asthma in children' at Hospital San Ignacio in Bogota. Besides there were four workshops in Bogota; workshops on Bone infection and Bone scan in Pediatric ortopaedics at Hospital Militar and Fundacion CardioInfantil, a workshop for Nuclear Medicine Technologists and a workshop on Sentinel Lymph Node mapping and Surgical Gamma Probe Application at Institute of Oncology. A nuclear cardiology workshop was organized in Medellin, and finally crowning them all was the 9th Congress of the Colombian Association of Nuclear Medicine at Cali from 10-12 October, 2003; probably the largest and best Colombian nuclear medicine congress every held in the country. A workshop was also organized in Cali for nuclear medicine technologists in conjunction with the Annual Convention. It was a mix of IAEA's Technical Cooperation and Regular Budget activities along with the activities of Colombian Association of Nuclear Medicine, bringing in absolute synergy to galvanize the entire nuclear medicine community of the country. The week saw nuclear medicine scientists from more than 20 IAEA Member States converging on Colombia to spread the message of nuclear medicine, share knowledge and to foster International understanding and friendship among the nuclear medicine people of the world

  16. 75 FR 54696 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2010-09-08

    ...., Bogota, Colombia; c/o DIRECCION COMERCIAL Y MARKETING CONSULTORIA EMPRESA UNIPERSONAL, Bogota, Colombia... COLOMBIA LTDA., Bogota, Colombia; c/o ASOCIACION TURISTICA INTERNACIONAL S.C.S., Bogota, Colombia; c/o...

  17. L-Moments Regional Frequency Analysis Methodology Application in maximum rainfall values over the Bogota River's basin

    Science.gov (United States)

    Romero, Claudia; Mesa, Duvan

    2015-04-01

    L-Moments Regional Frequency Analysis Methodology Application in maximum rainfall values over the Bogota River's basin 1°Claudia Patricia Romero Hernández; 2°Duvan Javier Mesa Fernández Universidad Santo Tomas; Colombia The application area of this methodology is the Bogota River's basin, which is located in Cundinamarca; a Colombian department with a total surface area of 589.143 hectares. This basin includes 19 sub-basins, and it is the most densely urbanized of the country. Including its metropolitan area, this region boasts a population of 9.000.000 inhabitants; which composes approximately 23% of Colombia's population and possesses around 19% of the country's industries. This basin has shown a notorious increase of complicated floods frequency in the last few years due to climatic variations. These climatic periods correspond to a weather pattern called Niña Phenomenon (2010-2011), which affected 57.000 citizens in this department and 4,900 people directly in Bogota city, with an estimated economic damage of 277'121,052 USD. The Regional Frequency Analysis methodology is a statistics procedure that consists in adding information from multiple samples in a single large sample, assuming previously that all of these come from the same probability model, except for a difference between them due to a scale factor. These samples are defined by a "regionalization" procedure known as the "Avenue Index" or "Flood Index". This procedure groups several kinds of information that comes from a common probability model, such as temperature, rainfall, and water flow. This model must be similar for all of the weather stations located in a homogeneous region. Maps for each of 4 return periods (5, 10, 50 and 100 years) were developed based on 120 weather stations located on this basin. The information used in this process comes from median monthly rainfall data, based on historical series between 30 and 40 years average. An increase in the annual median rainfall was

  18. Metabolic syndrome and associated factors in a population-based sample of schoolchildren in Colombia: The FUPRECOL Study

    OpenAIRE

    Anzola Zamudio, Jose Alejandro

    2016-01-01

    In contrast to the definition of metabolic syndrome (MetS) in adults, there is no standard definition of MetS in pediatric populations. We aimed to assess the differences in the prevalence of MetS in children and adolescents aged 9–17 years in the city of Bogota (Colombia) using four different operational definitions for these age groups and to examine the associated variables. A total of 673 children and 1,247 adolescents attending public schools in Bogota (54.4% girls; age range 9–17.9 year...

  19. Advanced DC/DC converters

    CERN Document Server

    Luo, Fang Lin

    2003-01-01

    DC/DC conversion techniques have undergone rapid development in recent decades. With the pioneering work of these authors, DC/DC converters have now moved into their sixth generation. This book offers a concise, practical presentation of DC/DC converters, summarizing the spectrum of conversion tecnologies and presentingmany new ideas and more than 100 new topologies. Nowhere else in the literature are DC/DC converters so logically sorted and systematically introduced, and nowhere else can readers find detailed information on prototype topologies that represent a major contribution to modern power engineering. More than 320 figures, 60 tables, and 500 formulae facilitate understand and provide precise data.

  20. Plan Colombia: A Case For Political Warfare To Defeat Transnational Criminal Organizations In The Gray Zone

    Science.gov (United States)

    2016-05-26

    https://www.mindefensa.gov.co/irj/go/ km/docs/Mindefensa/Documentos/descargas/ estudios %20ssectoriale/info_estadistica/Logros_Sec tor_Defensa.pdf. Of...Departamento Administrativo Nacional de Estadística (Colombian National Administrative Department of Statistics), Mercado Laboral: Principales...Department of Statistics). Mercado Laboral: Principales Resultados Diciembre de 2015. Bogota: Gobierno de Colombia, 2016. Accessed February 17, 2016

  1. ?Strange Attractors (chaos) in the hydro-climatology of Colombia?

    International Nuclear Information System (INIS)

    Poveda Jaramillo, German

    1997-01-01

    Inter annual hydro-climatology of Colombia is strongly influenced by extreme phases of ENSO, a phenomenon exhibiting many features of chaotic non-linear system. The possible chaotic nature of Colombian hydrology is examined by using time series of monthly precipitation at Bogota (1866-1992) and Medellin (1908-1995), and average stream flows of the Magdalena River at Puerto Berrio. The power spectrum, the Haussdorf-Besikovich (fractal) dimension, the correlation dimension, and the largest Lyapunov exponent are estimated for the time series. Ideas of hydrologic forecasting and predictability are discussed in the context of nonlinear dynamical systems exhibit chaotic behavior

  2. Bidirectional DC/DC Converter

    Science.gov (United States)

    Pedersen, F.

    2008-09-01

    The presented bidirectional DC/DC converter design concept is a further development of an already existing converter used for low battery voltage operation.For low battery voltage operation a high efficient low parts count DC/DC converter was developed, and used in a satellite for the battery charge and battery discharge function.The converter consists in a bidirectional, non regulating DC/DC converter connected to a discharge regulating Buck converter and a charge regulating Buck converter.The Bidirectional non regulating DC/DC converter performs with relatively high efficiency even at relatively high currents, which here means up to 35Amps.This performance was obtained through the use of power MOSFET's with on- resistances of only a few mille Ohms connected to a special transformer allowing paralleling several transistor stages on the low voltage side of the transformer. The design is patent protected. Synchronous rectification leads to high efficiency at the low battery voltages considered, which was in the range 2,7- 4,3 Volt DC.The converter performs with low switching losses as zero voltage zero current switching is implemented in all switching positions of the converter.Now, the drive power needed, to switch a relatively large number of low Ohm , hence high drive capacitance, power MOSFET's using conventional drive techniques would limit the overall conversion efficiency.Therefore a resonant drive consuming considerable less power than a conventional drive circuit was implemented in the converter.To the originally built and patent protected bidirectional non regulating DC/DC converter, is added the functionality of regulation.Hereby the need for additional converter stages in form of a Charge Buck regulator and a Discharge Buck regulator is eliminated.The bidirectional DC/DC converter can be used in connection with batteries, motors, etc, where the bidirectional feature, simple design and high performance may be useful.

  3. The relationship between mobility and public space. Transmilenio in Bogota

    Directory of Open Access Journals (Sweden)

    Myriam Stella Díaz Osorio

    2016-04-01

    Full Text Available Las relaciones entre la movilidad y el espacio público. Transmilenio en BogotáResumenEl desarrollo urbano de las ciudades ha estado ligado al desarrollo de los sistemas de movilidad, destacando aspectos relacionados con la extensión territorial, la funcionalidad, la estética, la experiencia de viaje, entre otros. De esta manera, las dos estructuras definen el paisaje urbano que será apreciado por los habitantes. En el presente artículo se expondrán los intereses, las prácticas y los alcances del semillero espacio público y movilidad urbana, que buscan identificar las relaciones existentes entre las estructuras del sistema de Movilidad Transmilenio, en Bogotá, y el espacio público adyacente a dicha estructura. Se determinará el marco conceptual para la investigación, seguido de la presentación del análisis del caso Transmilenio a través de herramientas de registro e interpretación de las situaciones relacionadas con el espacio público y la estructura de movilidad, identificando las relaciones existentes.Palabras claves: desarrollo urbano, vida urbana, transporte público, espacio urbano.The relationship between mobility and public space. Transmilenio in BogotaAbstractThe urban development of cities has been linked to the development of mobility systems, highlighting issues related to territorial extent, functionality, aesthetics, the experience of travel, among others. Thus, two structures define the urban landscape that will be appreciated by its inhabitants. In this article the interests, practices and scope of the research hotbed in public space and urban mobility, which seek to identify the relationships between the structures of the mobility system Transmilenio in Bogota, and the adjacent public space to that structure will be shown. The conceptual framework for research will be determined, followed by the presentation of the Transmilenio case analysis through logging tools and interpretation of situations related to

  4. Citibikes de Colombia. La bicicleta publica: sistema alternativo de transporte para Santafe de Bogota

    Directory of Open Access Journals (Sweden)

    Javier Enrique Ramos

    2000-12-01

    Full Text Available EI objetivo del presente artículo es presentar una nueva propuesta en materia de transporte urbano, teniendo en cuenta el cada vez más restringido uso del automóvil particular y la ineficiencia de los actuales médicos de transporte público. En la primera parte del trabajo se presenta un panorama general de la importancia de los sistemas de transporte en las ciudades y cómo afectan la vida de sus habitantes. También se muestra la situación actual del transite en Bogotá y la necesidad de implantar sistemas alternativos de transporte. En la segunda parte, se propone el diseño de un sistema en línea de alquiler de bicicletas denominado Bicicleta Publica, que sea parte integral del Sistema integrado de transporte para Santafé de Bogotá. Para cumplir con este propósito se presentan los lineamientos generales mediante un plan de negocios, que conduzca a la creación de una empresa que administre el sistema y los servicios conexos. EI plan de negocios pretende cubrir la mayor parte de la ciudad, ubicando estaciones de bicicleta publica en diferentes lugares, principalmente en las áreas de influencia de las universidades, parques, centros comerciales y, en un futuro, en las estaciones de Transmilenio y el Metro. Esto le brinda al usuario la posibilidad de tomar una bicicleta en un punto determinado y retornarla en otra estación diferente a donde la alquiló inicialmente. Las ventajas de este mecanismo son apreciables, ya que no representa complicación alguna para el usuario debido a que puede usar la bicicleta el tiempo deseado sin preocuparse por aspectos tales como el estacionamiento, el clima o las diferentes actividades, para lo cual la bicicleta propia sería un completo inconveniente.

  5. Autoverification of the automated blood cell counter (CBC in a reference laboratory in Bogota, Colombia

    Directory of Open Access Journals (Sweden)

    Oscar Martinez-Nieto

    2015-12-01

    Full Text Available ABSTRACT Introduction: The clinical laboratory is part of the group of actors in health systems that are under increasing pressure by users and administrators to increase their productivity in order to respond efficiently to the increased volume of patients, optimizing costs and professional time. This pressure forced laboratories to perform a full review of their procedures and develop technical, logistical and computational tools to enable excellent response times. Objective: This study aimed to evaluate the implementation of the automated blood cell counter autoverification process and its impact on the safety of patients. Methods: Verification rules were designed in the connectivity software, based on manual validation criteria for laboratory professionals, according to the guidelines of the Clinical and Laboratory Standards Institute (CLSI Guideline Auto10-A and the International Consensus Group for Hematology Review (ISLH. The autoverification percentage was established, and non-conforming product (NCP percentages were estimated before and after the procedure. Pilot tests were also performed in different days so as to adjust the process. Results: 53.4% of automated blood cell counters autoverification were achieved, and, subsequently in the audit of 18 months, 60% was reached due to verification adjustments in the delta programmed filter. The NCPs rose from 0.065% to 0.0036% from the beginning to the end of the process. Conclusion: The autoverification process enabled to reduce the variability associated with human intervention, therefore the professional is able to focus on the pathological report analysis, reducing the risk of errors and advocating greater importance on patient safety.

  6. Self-reported vaccination in the elderly: SABE Bogota study, Colombia.

    Science.gov (United States)

    Cano Gutierrez, Carlos; Reyes-Ortiz, Carlos; Borda, Miguel German; Arciniegas, Antonio

    2016-03-30

    To determine the frequency of vaccination in older adults within the city of Bogotá and to estimate the association with sociodemographic and health factors. This is a secondary data analysis from the SABE-Bogotá Study, a cross-sectional population-based study that included a total of 2,000 persons aged 60 years. Weighted percentages for self-reported vaccination [influenza, pneumococcal, tetanus] were determined. The association between vaccination and covariates was evaluate by logistic regression models. A total of 73.0% of respondents received influenza, 57.8% pneumococcal and 47.6% tetanus vaccine. Factors independently associated with vaccination included: 1- age (65-74 years had higher odds of receiving vaccinations, compared to 60-64 years); 2- socioeconomic status (SES) (higher SES had lower odds of having influenza and pneumococcal vaccines, compared to those with lower SES); 3- health insurance (those with contributive or subsidized health insurance had higher odds (between 3 and 5 times higher) of having vaccinations, compared to those with no insurance); 4- older adults with better functional status (greater Lawton scores) had increased odds for all vaccinations; 5- older adults with higher comorbidity had increased odds for influenza and pneumococcal vaccinations. Vaccination campaigns should be strengthened to increase vaccination coverage, especially in the group more reticent to vaccination or vulnerable to reach it such as the disabled elder.

  7. Colombia: Emerging Labor Movement and the State Colombian Drug Problem: Effect on the Peace Process between the M19 and the State

    Science.gov (United States)

    1990-05-01

    de la Energia en Colombia. 1537-1930 (Bogota,1985), 1. 39 Steam navigation in the inland rivers, Magdalena and Cauca Rivers, used wood as a fuel to...Cartagena, 325. 72 Table 5. Cartagena-Oil Refining Co. 1912 Prod Rates (Monthly) ° Product Octane Amount Gasoline 72 Kerosene "Luz Solar " 110 Kerosene "Luz...1987. De La Pedraja, Ren6. Energy Politics in Colombia, San Francisco : Westview Press, 1989. De La Pedraja, Ren6. Historia de la Energia en Colombia

  8. Colombian Strategies and Operational Concepts Used in Today’s Counterterrorism Warfare

    Science.gov (United States)

    2009-06-12

    Grupo editorial norma. Medina, Carlos. 2001. Elementos para una Historia de las Ideas Políticas del. Bogota D.C.: Rodríguez Quito Editores...Crimen Violento Y Actividad Criminal En Colombia. Analisis, Bogota , D.C. FARC, Secretariat. 1990. Estrategia Fuerzas armadas Revolucionarias de ...Uribe. 2000. Democratic security policy. Bogota : Presidenci de la Republica. 78 Walser, Ray. 2008. The Heritage Foundation. 30 June. http

  9. Milliwatt dc/dc Inverter

    Science.gov (United States)

    Mclyman, C. W.

    1983-01-01

    Compact dc/dc inverter uses single integrated-circuit package containing six inverter gates that generate and amplify 100-kHz square-wave switching signal. Square-wave switching inverts 10-volt local power to isolated voltage at another desired level. Relatively high operating frequency reduces size of filter capacitors required, resulting in small package unit.

  10. Colombia: Updating the Mission

    Science.gov (United States)

    2011-09-01

    or La Violencia . Bogota was nearly destroyed, and the bloodshed spilled into the countryside where it reached its greatest intensity. The machete...role and its commitment to its assigned mission. Army Mission During La Violencia (1948–1962) Of course, it is the army that we are par- ticularly...result was Colombia’s costli- est civil war, termed simply The Violence, or La Violencia . Bogota was nearly destroyed, and the bloodshed spilled into

  11. History of medical micology in Colombia, 1930-1970 = Historia de la micología médica en Colombia, 1930-1970

    Directory of Open Access Journals (Sweden)

    Galvis Pérez, Yeisson

    2013-04-01

    Full Text Available The overall objective of this research was to understand the events that made possible the creation, diffusion and appropriation of medical mycology in Colombia between 1930 and 1970. It was based on the review of scientific journals and theses in different libraries, archives and documentation centers in Medellin and Bogota. The report includes the different problems faced by physicians and laboratory personnel concerning the classification of fungi, the relationship between dermatology and mycology, the development of the study of systemic mycoses and the role played by some persons in the institutionalization of medical mycology.

  12. Strategies for the implementation of an environmental mining plan of the construction materials in Bogota. Phase 1 Diagnostic

    International Nuclear Information System (INIS)

    Gonzalez Oviedo, Leopoldo; Parrado L, Guillermo; Cardenas, John Fernan

    1995-01-01

    The study contains the geologic aspects, miners and environmental of 10 areas selected in Bogota where construction materials exist, like they are sands, clays, and gravels, in each area a definition is made, the productive units are described, reserves, mining production and environmental impacts are given generated by the material exploitation; a prioritizing of potential areas is included to implement a miner-environmental plan of this industry in Bogota

  13. Social Stratification in Bogota: From Public Politics to the Dynamics of Social Segregation

    Directory of Open Access Journals (Sweden)

    Consuelo Uribe-Mallarino

    2008-02-01

    Full Text Available This paper presents results from two research projects aimed at inquiring about socioeconomic stratification in Bogota from the perspective of its value as representation of social order and hierarchy. Although socioeconomic stratification was implemented as a targeting mechanism of subsidies for the poorest households with the objective to enable them to have domiciliary potable water, electricity, sewer, gas and telephone, the policy has deeply affected the way social differences are collectively evoked. Research results from projects conducted in Bogota between 2005 and 2007, based on a variety of sources and methods, are approached with a view on social representations as a group of ideas and practices that are collectively shared and socially generated. Conclusions deal with issues of stratification and socio-spatial segregation, as well as the present configuration of representations about social differences.

  14. Genetic architecture of male sterility and segregation distortion in Drosophila pseudoobscura Bogota-USA hybrids.

    Science.gov (United States)

    Phadnis, Nitin

    2011-11-01

    Understanding the genetic basis of reproductive isolation between recently diverged species is a central problem in evolutionary genetics. Here, I present analyses of the genetic architecture underlying hybrid male sterility and segregation distortion between the Bogota and USA subspecies of Drosophila pseudoobscura. Previously, a single gene, Overdrive (Ovd), was shown to be necessary but not sufficient for both male sterility and segregation distortion in F(1) hybrids between these subspecies, requiring several interacting partner loci for full manifestation of hybrid phenomena. I map these partner loci separately on the Bogota X chromosome and USA autosomes using a combination of different mapping strategies. I find that hybrid sterility involves a single hybrid incompatibility of at least seven interacting partner genes that includes three large-effect loci. Segregation distortion involves three loci on the Bogota X chromosome and one locus on the autosomes. The genetic bases of hybrid sterility and segregation distortion are at least partially--but not completely--overlapping. My results lay the foundation for fine-mapping experiments to identify the complete set of genes that interact with Overdrive. While individual genes that cause hybrid sterility or inviability have been identified in a few cases, my analysis provides a comprehensive look at the genetic architecture of all components of a hybrid incompatibility underlying F(1) hybrid sterility. Such an analysis would likely be unfeasible for most species pairs due to their divergence time and emphasizes the importance of young species pairs such as the D. pseudoobscura subspecies studied here.

  15. Towards a radiation safety culture at Universidad Nacional de Colombia

    International Nuclear Information System (INIS)

    Poveda, Jairo F.; Munera, Hector A.

    2008-01-01

    Full text: During the 20th century, nuclear and radiation techniques for research, teaching, and medical and engineering practice slowly appeared at the National University of Colombia, mainly at the Bogota, Medellin and Manizales branches. Each individual laboratory or researcher obtained the license for the use of the radioactive source, or radiation emitting apparatus. However, the University as a whole does not have as yet a Radiation Safety Manual, nor an inventory of laboratories using radiation. From the viewpoint of radiation safety and culture, this situation is undesirable, and may easily lead to inappropriate waste management practices, including the possibility of orphan sources (one such source has been already found). As part of the program of environmental management of dangerous wastes promoted by the National Division of Laboratories of our University, an office of radiation safety was created in the year 2006. This paper describes the situation that was found, the activities that have been carried out, some of the difficulties that we have met, and the plans that we have to help shape a safety culture at our institution. Currently we are pursuing an inventory of laboratories using radioactive sources and radiation emitting apparatuses, starting with the branches in Bogota and Manizales which are perceived as the most urgent to deal with. Fortunately, the branch in Medellin has been for about a decade under the care of a former radiation safety officer of our national Institute of Nuclear Affairs, who presently teaches there. During 2006 and 2007, 13 laboratories using radioactive sources were visited in the Bogota branch. Safety procedures and waste handling protocols were checked, safety manuals prepared and/or revised, and recommendations for safety culture provided. During 2008 we will visit Manizales, and will continue visiting a number of X-ray machines used in the Bogota branch for engineering, veterinary, and diagnostic, and surgery medical

  16. DC Home Appliances for DC Distribution System

    Directory of Open Access Journals (Sweden)

    MUHAMMAD KAMRAN

    2017-10-01

    Full Text Available This paper strengthens the idea of DC distribution system for DC microgrid consisting of a building of 50 apartments. Since the war of currents AC system has been dominant because of the paucity of research in the protection of the DC system. Now with the advance research in power electronics material and components, generation of electricity is inherently DC as by solar PV, fuel cell and thermoelectric generator that eliminates the rectification process. Transformers are replaced by the power electronics buck-boost converters. DC circuit breakers have solved the protection problems for both DC transmission and distribution system. In this paper 308V DC microgrid is proposed and home appliances (DC internal are modified to operate on 48V DC from DC distribution line. Instead of using universal and induction motors in rotary appliances, BLDC (Brushless DC motors are proposed that are highly efficient with minimum electro-mechanical and no commutation losses. Proposed DC system reduces the power conversion stages, hence diminishes the associated power losses and standby losses that boost the overall system efficiency. So in view of all this a conventional AC system can be replaced by a DC system that has many advantages by cost as well as by performance

  17. Latin American Clinical Epidemiology Network Series - Paper 6: The influence of alcohol in traffic accidents and health care costs of it in Bogotá-Colombia.

    Science.gov (United States)

    Gómez-Restrepo, Carlos; Naranjo-Lujan, Salomé; Rondón, Martín; Acosta, Andrés; Maldonado, Patricia; Arango Villegas, Carlos; Hurtado, Jaime; Hernández, Juan Carlos; Angarita, María Del Pilar; Peña, Marcela; Saavedra, Miguel Ángel; Quitian, Hoover

    2017-06-01

    In Colombia, some studies have estimated medical costs associated to traffic accidents. It is required to assess results by city or region and determine the influence of variables such as alcohol consumption. The main objective of this study was to identify health care costs associated to traffic accidents in Bogota and determine whether alcohol consumption can increase them. Cross-sectional costs study conducted in patients over 18 years treated in the emergency rooms of six different hospitals in Bogota, Colombia. The average total cost of medical care per patient was 628 USD, in Bogota-Colombia. The average cost per accident was estimated at 1,349 USD. On average, the total cost for health care for patients with positive blood alcohol level was 1.8 times higher than those who did not consume alcohol. The indirect costs were on average 115.3 USD per injured person. Numbers are expressed in 2011 U.S. dollars. Alcohol consumption increases the risk of traffic accidents and direct medical health costs. Copyright © 2016 Elsevier Inc. All rights reserved.

  18. "Forback" Dc-To-Dc Converters

    Science.gov (United States)

    Lukemire, Alan T.

    1992-01-01

    Dc-to-dc power-converter circuits called "forback" resemble circuits of standard configurations called "forward", "flyback", and "Cuk". Circuit employs minor modifications to existing topologies, combines advantages, while eliminating disadvantages, of older circuits.

  19. [Risk of Eating Behavior Disorder among Medical Students in Colombia].

    Science.gov (United States)

    Campo-Arias, Adalberto; Villamil-Vargas, Miryam

    2012-06-01

    An important number of medical students are at Risk of suffering an Eating Behavior Disorder (REBD). However, research has been limited regarding associated variables in Colombian students. To estimate the prevalence and related demographic and psychosocial variables associated to the REBD among medicine students in a university of Bogota, Colombia. Transversal study. Demographic variables, academic performance, level of physical activity, daily cigarette smoking, and abuse of alcohol, personal health and observed stress were quantified. The SCOFF questionnaire was used to quantify REBD. Logistic regression was applied to adjust the associations. 289 students participated with an average age of 21.7 years (SD = 2.8), 63.7% were female students. It was observed that 82 students (28.4%) reported unsuccessful academic performance; 35 of them (12.1%), showed high level of physical activity; 39 (13.5%), reported daily cigarette smoking; 86 (29.8%), abused alcohol; 47 (16.3%), showed poor personal health; 23 (8.0%) high stress level observed; and 59 (20.4% 95% CI 15.8-25.0), REBD. High stress level observed (OR = 5.58; 95% CI 2.08-14.95), female (OR = 2.83; 95% CI 1.35-5.95) and alcohol abuse (OR = 2.18; 95% CI 1.10-4.11) were associated to REBD, after adjusting concerning personal health. Approximately one out of five medical students reports REBD in a private university of Bogota, Colombia reported REBD. High levels of stress observed, female gender and alcohol abuse are associated to REBD. Further research is necessary. Copyright © 2012 Asociación Colombiana de Psiquiatría. Publicado por Elsevier España. All rights reserved.

  20. Contamination with Cadmium and Arsenic in soils and vegetables of a sector of the Bogota River Basin

    International Nuclear Information System (INIS)

    Gonzalez G, Saul; Mejia, Leonidas

    1995-01-01

    Soils of six different horticultural sites of the Savanna of Bogota (Cundinamarca) traditionally watered with the highly polluted waters of the Bogota River, were sampled to quantify Cd and As accumulated with irrigation. Soil of site six representatives of Rio Bogota series (fine clay, mixed, isothermic family of Fluventic tropaquepts) was selected for greenhouse experiments directed to show: a) Actual content of Cd and As in one of the most representative horticultural soil sites of the plain savanna. b) The accumulation level of Cd and As in the edible parts of three different vegetables (lettuce, cucumber and carrots) watered with polluted waters with know and variable Cd and As concentrations. c) The effects of Cd and As on vegetable's yields

  1. DC electric springs with DC/DC converters

    DEFF Research Database (Denmark)

    Wang, Qingsong; Cheng, Ming; Jiang, Yunlei

    2016-01-01

    The concept of DC electric spring (DCES) was recently proposed to solve the stability issue caused by integrating intermittent renewable energy sources (RESs) to DC microgrids. In this paper, a new topology of DCES is proposed based on DC/DC converters. The proposed DCES consists of a bi-directio......The concept of DC electric spring (DCES) was recently proposed to solve the stability issue caused by integrating intermittent renewable energy sources (RESs) to DC microgrids. In this paper, a new topology of DCES is proposed based on DC/DC converters. The proposed DCES consists of a bi...... and/or constant discharging for batteries is adopted and four operating modes are analyzed as charging-positive, charging-negative, discharging-positive and discharging-negative modes. An additional mechanism for fast charging or fast discharging is also designed to secure normal operation...... of batteries. With the proposed DCES, the power fluctuations due to intermittent RESs can be passed to non-critical loads (NCLs) and batteries while power on critical loads (CLs) is kept stable. This is possibly the first attempt to design a DCES with only DC/DC converters. The performances of the proposed...

  2. REDESCUBRIMIENTO DE MYRRHINIUM ATROPURPUREUM VAR. OCTANDRUM (MYRTACEAE: MYRTINAE EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    PARRA-O. CARLOS

    2003-12-01

    Full Text Available Se documenta el redescubrimiento de Myrrhinium atropurpureum var. octandrum(Myrteae DC., Myrtaceae, taxón prácticamente desconocido en Colombia. Se presentala descripción del taxón, así como notas sobre su distribución en Colombia, elhábitat en que se desarrolla y su posible estatus dentro de las categorías de la ListaRoja de la UICN.

  3. High HIV Burden in Men Who Have Sex with Men across Colombia's Largest Cities: Findings from an Integrated Biological and Behavioral Surveillance Study.

    Science.gov (United States)

    Rubio Mendoza, Martha Lucía; Jacobson, Jerry Owen; Morales-Miranda, Sonia; Sierra Alarcón, Clara Ángela; Luque Núñez, Ricardo

    2015-01-01

    Among Latin America's concentrated HIV epidemics, little is known about men who have sex with men (MSM) in Colombia, the region's third largest country. To date, surveillance studies have been limited to Bogota, while 80% of HIV cases and deaths originate from Colombia's other cities and departments. The extent to which interventions should prioritize MSM outside of Bogota is unknown. We recruited 2603 MSM using respondent-driven sampling from seven of Colombia's largest cities. HIV prevalence was estimated by site from dried blood spot samples. Behavioral data were collected through face-to-face interviews and risk factors for HIV infection analyzed using weighted, multi-level logistical regression models accounting for recruitment patterns. Across cities, HIV prevalence averaged 15%, varied from 6% to 24% and was highest in Cali, Bogota, and Barranquilla. In the past 12 months, 65% of MSM had ≥ 5 casual male partners and 23% had a female partner. Across partnerships (i.e., casual, stable, and commercial), the proportion of MSM engaging in unprotected sex was ≥ 52% with male partners and ≥ 66% with female partners. Self-reported history of STI (24%) and past-year illicit drug use (38%) were also common. In multivariate analysis, age ≥ 35 (adjusted odds ratio [AOR], 19.2) and 25-39 (AOR, 5.6) relative to ≤ 18-24 years, identifying as homosexual relative to heterosexual (AOR 0.1), meeting casual partners on the Internet (adjusted odds ratio [AOR], 3.1) and age of sexual debut of ≤ 13 years (AOR, 3.1) predicted HIV infection. HIV testing and prevention messaging reached just 24% of MSM in the past year. Findings support consistently elevated HIV burden among MSM throughout Colombia's largest cities and a need for enhanced behavioral prevention and HIV testing, emphasizing men who use the Internet as well as physical venues to meet sex partners.

  4. 77 FR 41479 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2012-07-13

    ..., Maria Teresa), c/o INVERSIONES MPS S.A., Bogota, Colombia; c/o PROYECTOS Y SOLUCIONES INMOBILIARIA LTDA., Bogota, Colombia; c/o GERENCIA DE PROYECTOS Y SOLUCIONES LTDA., Bogota, Colombia; DOB 3 Aug 1957; POB...

  5. Plan Colombia

    Directory of Open Access Journals (Sweden)

    Noam Chomsky

    2000-12-01

    Full Text Available Colombia recibe más ayuda militar de Estados Unidos que el resto de América Latina y el Caribe unidos, y esta situación puede profundizarse con la ejecución del Plan Colombia, fundamentado en la lucha antidrogas. Sin embargo, el pais ha sido calificado con el récord en violación de derechos humanos. En este contexto se aplica la reforma económica más significativa en la década de los noventa, generando condicionantes en los procesos de integración con sus vecinos. En concordancia con el secretario de Defensa, Henry Stimson, desde los años 60 Estados Unidos estaba autorizado para controlar su propio sistema regional, mientras todos los demás intenlos serian desmantelados. La presentación ambigua de esta política del gobierno estadounidense en Colombia es cómo disociar esta guerra contra la droga y la lucha irregular contrainsurgente En Estados Unidos hay otra opinión que debe conocerse para comprender las divergencias en e! interior de dicho país. Este artículo del prestigioso profesor universitario del MU, Noam Chomsky, es un referente obligado en términos de opinión pública y académica de dimensión internacional, por el inmenso respeto que infunde tanto en América como en Europa

  6. Incidence of public expenditure on the human development index in Bogota, 1995-2010

    Directory of Open Access Journals (Sweden)

    Mónica Consuelo Rodríguez Torres

    2012-01-01

    Full Text Available This paper seeks to test the hypothesis that social public expenditure per capita invested in Bogota has had a significant influence on the improvement of the city’s human development. For this purpose, the Human Development Index (HDI for the capital between 1995-2010 is estimated, using the new methodology proposed by the UNDP in 2010. Thus, a retrospective estimation of the life expectancy, salaries, and educational achievement rates is carried out, the last as a combination between the average years of education and expected years of instruction. A qualitative analysis is then presented, between the HDI components and the social public expenditure invested through politics, programs, projects carried out in the city, according to the District Development Plan “Bogotá positiva, para vivir mejor (Positive Bogota, to Live Better”. Finally, a quantitative analysis of this relation is made and it is concluded that social public spending per capita is significant to explain the HDI, since there is a long-term and stable relation between the two variables.

  7. Breast Cancer Screening Coverage with clinical examination and Mammography Among insured women in Bogota

    International Nuclear Information System (INIS)

    Arboleda, Walter; Murillo Raul; Pinero, Marion

    2009-01-01

    The objective is to determine the coverage of clinical breast examination (CBE) and mammography for screening of breast cancer among a group of insured women in Bogota. Methods: A telephone survey was carried out with 4,526 women between the ages of 50 and 69, residing in Bogota or its suburbs, who were insured by one of three commercial health plans. Women with a history of breast cancer were excluded. Screening coverage was estimated as the proportion of women who had had a mammography or CBE. Estimates were established for lifetime frequency, two years prior the survey, and one year prior the survey. Factors associated with screening procedures were analyzed with calculations based on adjusted OR. Results: Lifetime frequency of CBE was 59.3% and 79.8% for mammography; and 49.7% and 65.6% of women respectively underwent the tests for screening purposes; the remainder, for diagnostic purposes (breast symptoms). CBE reported a 34.2% one year coverage and mammography reported a 54% two years coverage. Screening was associated to cancer education and family history of breast cancer. Conclusion: Coverage of CBE for screening purposes is low. Mammography coverage is above that required by the Colombian Health Ministry, but below that reported by developed countries.

  8. Spatiotemporal variability and meteorological control of particulate matter pollution in a large open-pit coal mining region in Colombia

    Science.gov (United States)

    Morales Rincon, L. A.; Jimenez-Pizarro, R.; Porras-Diaz, H.

    2012-12-01

    Luis Morales-Rincon (1), Hernan Porras-Diaz (1), Rodrigo Jiménez (2,*) (1) Geomatic Research Group, Department of Civil Engineering, Universidad Industrial de Santander, Bucaramanga, Santander 680002, Colombia; (2) Air Quality Research Group, Department of Chemical and Environmental Engineering, Universidad Nacional de Colombia, Bogota, DC 111321, Colombia *Corresponding author: phone +57-1-316-5000 ext. 14099, fax +57-1-316-5334, e-mail rjimenezp@unal.edu.co The semi-desertic area of Central Cesar, Colombia, produced approximately 44 million tons of coal in 2011. This mining activity has been intensively developed since 2005. There are currently 7 large-scale mining projects in that area. The coal industry has strongly impacted not only the ecosystems, but also the neighboring communities around the coal mines. The main goal of the research work was to characterize spatial and temporal variations of particulate matter (total suspended particulates - TSP - and particulate matter below 10 μm - PM10) as measured at various air quality monitoring stations in Cesar's coal industry region as well as to study the relationship between these variability and meteorological factors. The analysis of the meteorological time series of revealed a complex atmospheric circulation in the region. No clear repetitive diurnal circulation patterns were observed, i.e. statistical mean patterns do not physically represent the actual atmospheric circulation. We attribute this complexity to the interdependence between local and synoptic phenomena over a low altitude, relatively flat area. On the other hand, a comparison of air quality in the mining area with a perimeter station indicates that coal industry in central Cesar has a mayor effect on the levels of particulate matter in the region. Particulate matter concentration is highly variable throughout the year. The strong correlation between TSP and PM10 indicates that secondary aerosols are of minor importance. Furthermore, particle

  9. Mediating Pathways in the Socio-Economic Gradient of Child Development: Evidence from Children 6-42 Months in Bogota

    Science.gov (United States)

    Rubio-Codina, Marta; Attanasio, Orazio; Grantham-McGregor, Sally

    2016-01-01

    Research has previously shown a gap of near 0.5 of a standard deviation (SD) in cognition and language development between the top and bottom household wealth quartile in children aged 6-42 months in a large representative sample of low- and middle-income families in Bogota, using the Bayley Scales of Infant and Toddler Development. The gaps in…

  10. A clinical study of ADHD symptoms with relation to symptoms of learning disorders in schoolchildren in Bogota, Colombia.

    Science.gov (United States)

    Talero-Gutierrez, Claudia; Van Meerbeke, Alberto Velez; Reyes, Rodrigo González

    2012-02-01

    To investigate possible relationships between symptoms of ADHD and of learning disorder (LD) in a population geographically, culturally, and linguistically distinct from previous studies. The authors evaluated a cross section of 834 Colombian schoolchildren for childhood neurological pathologies on the basis of a medical examination and performance with reference to the Diagnostic and Statistical Manual (4th ed.) attention checklist, the General and Differential Aptitudes Battery, and the Visual-Motor Integration (VMI) test. Of the total sample, 382 were classified as "ADHD only," 54 as "LD only," and 75 as "ADHD + LD." A total of 459 had low VMI scores. ADHD, LD, and low VMI were significantly interrelated. Among the children with ADHD, the attention deficit subtype tended to have more learning problems than the hyperactive subtype, who showed no major deficiencies in their learning ability. This study provides additional evidence demonstrating a relationship between LD and ADHD, particularly with respect to verbal reasoning, visual-auditory memory, and VMI.

  11. Retardo del crecimiento intrauterino asociado con el consumo de pasta básica de cocaína por mujeres gestantes de Bogotá, D.C., Colombia

    Directory of Open Access Journals (Sweden)

    Oscar Ramírez

    2000-12-01

    Full Text Available El objetivo de este estudio fue identificar una posible asociación entre el consumo de pasta ásica de cocaína o 'basuco' entre mujeres embarazadas y el crecimiento intrauterino de sus productos vivos en dos hospitales de tercer nivel en Bogotá, Colombia. Con un diseño de cohorte retrospectiva, se encuestaron 1.878 mujeres en el puerperio mediato para indagar, entre otras variables, la historia sobre el consumo de drogas ilicitas. Tanto a las madres como a sus recién nacidos se les realizaron mediciones antropométricas estandarizadas. Se comparó la prevalencia de bajo peso al nacer (BPN, parto prematuro (PP y retardo del crecimiento intrauterino (RCIU con la historia de consumo de drogas ilicitas durante el embarazo por medio de modelos de regresión lineal múltiple y regresión logística múltiple, para ajustar el efecto de posibles confusores como edad materna, estado nutricional y patologias maternas, nivel socioeconómico, escolaridad y tabaquismo, entre otros. Los resultados mostraron que una de cada 189 mujeres consumió sustancias ilegales durante el embarazo, comúnmente Cannabis safiva o pasta básica de cocaina. Las consumidoras de ostos productos tipicamente tenían menor escolaridad, eran de nivel socioeconomico más bajo. eran más delgadas, con una historia de control prenatal inadecuado, primigestantes o multigestantes y, con frecuencia, también fumaban tabaco y bebían alcohol. Se halló una asociación entre el consumo de las sustancias ilegales con RCIU (cociente de suertes de prevalencias de 5.24, IC95%: 1,3-21.0, y un déficit de 0.7 desvios estándares del peso para la edad gestacional (p=0.03. Además, se encontró un cociente de suertes ajustado de 7,78 con IC95%: 1,O-62, entre el consumo de pasta básica de cocaina y RCIU. Aunque es probable que a través de entrevistas se subestime la prevalencia de consumo de drogas y a pesar del limitado poder del estudio, éste fue capaz de identificar un efecto importante

  12. 76 FR 31462 - Airworthiness Directives; The Boeing Company Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10...

    Science.gov (United States)

    2011-06-01

    ... Model DC-10-10, DC- 10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F.... Applicability (c) This AD applies to all The Boeing Company Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10- 40, DC-10-40F, MD-10-10F, MD-10-30F, MD-11, and MD-11F airplanes...

  13. Study of the mobilization of pollutants in soils of the Bogota Savanna - phase 1, Heavy Metals

    International Nuclear Information System (INIS)

    Gonzalez, Luz Myrian; Vargas Zarate, Orlando

    1997-01-01

    In this study the soils contamination of the Bogota Savanna was evaluated by heavy metals, that they have importance to be this the area of population's of the country bigger density, where the use of the soils has suffered changes in the last years that have affected its properties, as consequence of the not controlled growth of the urban area, of the industrialization and of the agricultural use not planned. As a first stage toward the risk evaluation for the presence of metals weighed in the soils of the Bogota Savanna, the concentrations of cadmium, cobalt, chromium, copper, manganese, nickel, lead, zinc, molybdenum, arsenic and mercury were measured. It was also measured the movilizable fraction and the mobile fraction, that is to say, the quantity of metals that can be taken by the roots of the plants or that it can be leached toward the water bodies. Equally, the soils of the Savanna were characterized in an area of the plane part that covers 800 km 2 , as for the physical and chemical properties that can affect the retention and mobilization of heavy metals. The results obtained shows elements, that will allow in a future to develop mobilization and transport models, adapted for our specific conditions and to make an risks evaluation for the population's health, foods consumption on these soils or for the possibility of contamination of the underground waters. The obtained data of levels of heavy metals and other properties of the soils will serve as base for future studies of the conditions of the Savanna soils and for the establishment of standard of quality in our country. During 1997 it plans to enlarge the study area to 1200 km 2 and to begin the sampling and analysis of the soils. In the first phase of the study were found levels of heavy metals that overcome the world averages especially cadmium, cobalt, nickel, lead and zinc and in some cases chromium and mercury, levels that put in evidence the existence an ecological risk and for the population

  14. Social responsability of the Bogota companies and their relation to employement and poverty

    Directory of Open Access Journals (Sweden)

    Adriana Patricia López Velázquez

    2006-07-01

    Full Text Available This article shows the main results , conclusions and recommendations from two researches about Entrepreneurial Social Responsibility (RSE, and its relation to poverty and employment in the specific case of Bogotá. These results were obtained from a field work and literature revision about RSE, both nationally and internationally. It is worth noting that most of the Bogota companies do not know or do not have any interest in RSE, for them RSE implies high costs and little economic revenue. Out of the total of companies, only 1,3% have participated in programs to reduce poverly applied by district administration, where the common points of public and private investmetl have been education, nutrition and housing programs. The companies that include RSE programs for their workers consider it positive, because the work environment improved and the employees' productivity increased, which contributed for the welfare of both parties.

  15. Heat island and spatio-temporal changes of temperature in the city of Bogota

    International Nuclear Information System (INIS)

    Angel, L; Ramirez, A; Dominguez, E.

    2010-01-01

    The planet Earth, as a whole, has experienced a warming process caused principally by the accumulation of atmospheric greenhouse gases. Otherwise, it has been well demonstrated that thermic islands exist inside of cities, essentially as a result of the replacement of forest areas with urban materials such as asphalt, concrete, bricks, etc. Based on this foundation, this research evaluated the minimum, median and maximum temperature changes that occurred in the city of Bogota over the last 40 years. This research makes evident the presence of a heat island 3o Cover the periphery median temperature in most of the city. There were also periods with increases and decreases in city temperatures, not affected in its main tendency by the Nino Phenomena which in contrast affected the periphery.

  16. Extra corporeal lithotripsy for shock waves: Experience in the Santa Fe de Bogota Foundation

    International Nuclear Information System (INIS)

    Serrano, Adolfo; Gomez, Rafael

    1992-01-01

    Extra corporeal shock wave lithotripsy is currently the first treatment option in the majority of urinary stones. Shock-wave generation is done with different sources: electrohidraulic, electromagnetic and piezoelectric. Conduction of the waves is done through water. The patient receives shock waves being submerged in water or through a water cushion that is attached to his flank. Stone localization is done with fluoroscopy or ultrasound. Pain intensity varies depending on the lithotripter used. Stone fragmentation varies also and is directly proportional to the pain elicited. At the Fundacion Santa Fe de Bogota we use tripper Xl by oirex since June 1990. The machine has an electrohidraulic generator; uses fluoroscopic localization and shock trans-mission is done with a water cushion. We have had success in the treatment of 97% of renal calculi and in 88% of those located in the urethra; our overall success rate is 92%

  17. ESTUDIO DE LAS VISITAS DE LAS MOSCAS DE LAS FLORES (DIPTERA: SYRPHIDAE EN Salvia bogotensis (LAMIACEAE EN EL JARDÍN BOTÁNICO JOSÉ CELESTINO MUTIS (BOGOTÁ D.C., COLOMBIA

    Directory of Open Access Journals (Sweden)

    Zamora Monica

    2011-12-01

    Full Text Available El objetivo de esta investigación fue describir la interacción entre Salvia bogotensis (Lamiaceae y las moscas de las flores (Diptera: Syrphidae en un ambiente urbano, el jardín botánico "José Celestino Mutis" (Bogotá D.C.. Una vez comprobada la existencia del síndrome de entomofilia, se caracterizó la morfología floral, la composición taxonómica, la riqueza y la abundancia de las especies de sírfidos identificadas como visitantes florales, así como la morfometría cefálica y bucal. S. bogotensis presenta el síndrome de la entomofilia con ausencia de autofecundación. La comunidad de sírfidos asociada con esta comprende nueve especies, agrupadas en cinco géneros. Las especies son Allograpta neotropica Curran, 1936, Allograpta exotica Wiedermann, 1830, Allograpta annulipes Macquart, 1850, Allograpta aenea Hull, 1937, Lejops mexicana Macquart, 1842, Platycheirus ecuadoriensis Fluke, 1945, Platycheirus fenestrata Macquart, 1842, Syrphus shoree Fluke, 1950 y Toxomerus sp. 1. Las especies de moscas identificadas presentan en su conjunto características conductuales y morfológicas asociadas a polinizadores de baja eficiencia, con una baja tasa de visitas, incapacidad de activación de los balancines y un mínimo contacto corporal del insecto con las anteras y el estigma de la flor. Adicionalmente, las moscas presentan una carga muy baja de granos de polen de S. bogotensis sobre el cuerpo y alta inversión de tiempo en la limpieza de su cuerpo (acicalamiento. Las flores visitadas por estos insectos no dieron origen a frutos. Todo lo anterior permite concluir que dichas moscas no son polinizadores efectivos de S. bogotensis. Además de dípteros, se observaron varias especies de insectos visitantes florales de S. bogotensis pertenecientes a las familias Apidae, Halictidae y Megachilidae. Los sírfidos se benefician por el consumo de polen de S. bogotensis, pero no interfieren en el crecimiento y el desarrollo de la planta, por lo cual

  18. Reference Values of Arterial Gases and Electrolytes in Canines from the Bogota Savanna

    Directory of Open Access Journals (Sweden)

    Carlos Andrés Trujillo Jurado

    2014-06-01

    Full Text Available Due to the lack of arterial gas values that meet our environmental conditions and the wide variety of out-of-date data in literature and used in everyday practice, obtained with different heights, breeds and equipment to the ones available in our context, it becomes necessary to generate our own knowledge adjusted to our reality. A random systematic measurement of arterial and venous blood was made on 100 healthy canines in the Bogota Savanna (Chia: 2652 m.a.s.l.; Cajica: 2558 m.a.s.l.; Sopo: 2650 m.a.s.l.; La Calera: 2718 m.a.s.l.; and Bogota: 2630 m.a.s.l.;, using the I-STAT® analyzer with EG7+ cartridge. Reference values were found for gasometry, electrolytes, effective basis and pH. The values were compared between four groups by weight. Descriptive statistics were made for each parameter based on average, standard deviation and standard error, and the trust limits (95% and the intervals with standard deviation (one and two deviations were found. A decrease on PCO2, PO2, SO2, bicarbonate and BE was evident. The pH was found to be slightly increased, similar to the one reported by authors at great heights and different (not statistically confirmed from reports in literature, where height was not a variable. Even so, they are frequently used as reference in the practice of small animals; only PO2 presented statistical differences by groups of weight. As a conclusion, effective regulation of blood pH was evident at 2600 m.a.s.l., with different bicarbonate values, PCO2, PO2, BE, which suggest the need to obtain and use reference values consistent with local conditions.

  19. Charge pump DC-DC converter comprising solid state batteries

    NARCIS (Netherlands)

    Reefman, D.; Roozeboom, F.; Notten, P.H.L.; Klootwijk, J.H.

    2013-01-01

    An electronic device is provided which comprises a DC-DC converter. The DC-DC converter comprises at least one solid-state rechargeable battery (B1, B2) for storing energy for the DC-DC conversion and an output capacitor (C2).

  20. DC source assemblies

    Science.gov (United States)

    Campbell, Jeremy B; Newson, Steve

    2013-02-26

    Embodiments of DC source assemblies of power inverter systems of the type suitable for deployment in a vehicle having an electrically grounded chassis are provided. An embodiment of a DC source assembly comprises a housing, a DC source disposed within the housing, a first terminal, and a second terminal. The DC source also comprises a first capacitor having a first electrode electrically coupled to the housing, and a second electrode electrically coupled to the first terminal. The DC source assembly further comprises a second capacitor having a first electrode electrically coupled to the housing, and a second electrode electrically coupled to the second terminal.

  1. VENTAQUEMADA, COLOMBIA

    Directory of Open Access Journals (Sweden)

    Sergio D. Fonseca

    2017-01-01

    Full Text Available Con el objetivo de someter los residuos de maíz al proceso termoquímico llamado gasificación, en este trabajo se muestran resultados de diferentes análisis para conocer algunas propiedades físico-químicas que son de gran importancia antes de realizar este proceso. Se determinó el contenido de lignina la cual registro un valor de 14,7%, se determinó el poder calorífico de esta biomasa obteniendo un valor de 17,965 MJ kg-1, análisis TGA con tres velocidades de calentamiento diferentes, se realiza un análisis ultimo para revelar la composición química de la biomasa; estos resultados fueron comparados con estudios realizados en otros países. Los resultados obtenidos contribuyen a la investigación de este tipo de biomasa en Colombia, ya que no se registra información bibliográfica de la caracterización de esta; se debe aprovechar su uso en la utilización en el proceso de gasificación, ya que poseen las características necesarias para obtener un producto como el “syngas”.

  2. Dosquebradas, Colombia

    Directory of Open Access Journals (Sweden)

    Edgar Diego Erazo Caicedo

    2007-01-01

    Full Text Available Una investigación fenomenológica, adelantada desde la perspectiva latinoamericana de los Estudios Culturales en Pereira y Dosquebradas, en el Departamento de Risaralda, Colombia, tendiente a comprender la relación entre mediaciones tecnológicas y procesos de subjetivación juvenil, permitió identificar que estos procesos adoptan hoy una forma que hemos denominado «subjetivaciones tecnojuveniles», categoría ésta que refiere la interdependencia existente entre ambos fenómenos, es decir, la necesidad que experimentan los jóvenes de interactuar cotidianamente con las tecnologías, pero, así mismo, la necesidad que experimentan los mediadores que están detrás del fenómeno respecto al aporte de los jóvenes para la transformación permanente de tales discursos y prácticas no discursivas (de poder. Estos procesos de subjetivación se están transformando a un ritmo vertiginoso y están produciendo formas emergentes de dialogicidad y de estilos de vida juvenil, caracterizados, entre otros rasgos, por una sensación de poder sobre el propio trayecto vital, expresado, entre otras manifestaciones, por expectativas favorables sobre sí mismos, su presente y su futuro

  3. Prevalence of Alcohol Problem Drinking Among the Indigenous Population in Colombia.

    Science.gov (United States)

    Arévalo, Nadia Milena; Beltrán, Sandra Dolores; Chavarro, Yuri Lizeth; Medina, Alix Lorena; Herazo, Edwin; Campo-Arias, Adalberto

    2013-12-01

    Some studies have reported a high prevalence of alcohol drinking problem among indigenous populations in Latin America. However, there is no available information on some of the variables associated with alcohol problem drinking. To determine the prevalence and some factors associated with alcohol problem drinking among a sample of Colombian indigenous population in Bogotá, Colombia. A cross-sectional study was conducted using a Colombian indigenous population sample over 15 years old living in the community. Alcohol problem drinking was quantified with the Alcohol Use Disorders Identification Test (AUDIT) (Cut-off point of 8). Non conditional logistic regression was computed to adjust associated variables. A total of 184 subjects from the indigenous population participated in this research. The mean age was 32.0±14.0 years and educated for 6.0±3.7 years. A total of 84 participants (45.7%) reported alcohol problem drinking. The AUDIT showed Cronbach alpha of 0.877. Male sex (OR=4.2; 95%CI, 2.2-7.6), and longer time living in Bogota (OR=1.8; 95%CI, 1.0-3.2) were associated with alcohol problem drinking. Almost 50% of the Colombian indigenous population living in Bogota meet criteria for alcohol problem drinking. Male gender and longer time living in Bogota are related to alcohol problem drinking. Further studies are needed to formally identify alcohol abuse or dependence. Copyright © 2013 Asociación Colombiana de Psiquiatría. Publicado por Elsevier España. All rights reserved.

  4. A methodology of design for a one-variable neural network model to forecast the minimum temperature on the Mosquera zone, Cundimarca, Colombia

    International Nuclear Information System (INIS)

    Bonilla, Jose Ebert; Ramirez, Jairo; Ramirez, Oscar; Leon, Gloria and others

    2006-01-01

    The meteorological phenomena are factors that affect the economy, especially on a country like Colombia, which sustainability is based highly on agricultural products like corns, potato and flowers, plants of a paramour landscape like Bogota savannah. Among this phenomenon is the extreme minimum temperature (frost damage) it is a result of the non-lineal interactions of many atmospheric phenomena, for all that, frost damage forecast is very hard to accomplish with traditional methods. The approach of the project is to process this time series with an artificial neural network; it generals a now casting forecast on the zone of Mosquera

  5. Molecular Epidemiology of Epidemic Severe Malaria Caused by Plasmodium vivax in the State of Amazonas, Brazil

    Science.gov (United States)

    2005-01-01

    Suarez, C.F., Florez, C., del Portillo, H.A.; Andrade, L.E. Direct Submission to NCBI gene bank. Submitted 03-JAN-1997. Laboratorio de Biologia Molecular...Departamento de Biologia , Universidad Nacional de Colombia, Ciudad Universitaria, Santa Fe de Bogota, D.C., Colombia. Nardin, E.H.; Zavala, F

  6. Environmental quality evaluation for towns in Bogota; An approach to the construction of indexes of environmental quality

    International Nuclear Information System (INIS)

    Escobar, Luis; Bermudez, Tatiana

    2004-01-01

    This paper is a conceptual and methodological estimate for the construction of a synthetic indicator that allows one to come a step closer to the diagnosis of the environmental conditions of the nineteen administrative units of Bogota known as localidades. Here the contained information is synthesized in eight simple selected indicators, the index is constructed by applying analysis of principal components, of which the alignment of the localidades is derived in accordance with the value that it takes in the environmental quality index. Once the method of calculation is applied, the results indicate that the conditions of environmental quality if Bogota are not homogeneous, clearly existing environmental differences between localidades in the north and south. Also prioritization and analysis index of environmental qualities per localidades introduced, of which the principal determinants of the index of each localidad are introduced, thus providing the decision makers with important input, in order to define the base line as a stating point of the urban environmental management

  7. en Colombia?

    Directory of Open Access Journals (Sweden)

    William Andrés Ocampo Duque

    2006-01-01

    Full Text Available El Ministerio de Minas y Energía aprobó la comercialización de biogasolina en Colombia a partir del día 1.º de noviembre de 2005. La biogasolina (gasohol o mezcla E10 es una mezcla que contiene 90% de gasolina y 10% de etanol en volumen. El etanol se origina a partir de la fermentación natural, luego de extraer los jugos de cultivos como la caña de azúcar, el maíz, el trigo o la yuca. Tanto el Gobierno nacional como los productores interesados han manifestado que la biogasolina se presenta como una alternativa para reducir los efectos negativos sobre el medio ambiente que producen las grandes ciudades debido a la quema de combustibles fósiles en el sector del transporte. Sin embargo, en la literatura científica especializada la evidencia de efectos ambientales favorables por el uso de gasolina oxigenada con un 10% de etanol es escasa. Por el contrario, hay gran controversia a nivel mundial acerca del uso de este combustible modificado. En este trabajo se hace una extensa revisión científica en la que se muestra que la mezcla etanol-gasolina presenta cuestionables beneficios ambientales ya que puede incrementar la producción de contaminantes altamente tóxicos y smog fotoquímico, ofrece pocos beneficios en cuanto a reducciones de gases de efecto invernadero y sostenibilidad ambiental, además de incrementar el riesgo de la contaminación de las aguas subterráneas.

  8. Drugs of abuse consumption in health professionals (physicians and nurses) from two outpatient services of first level attention in Bogota

    OpenAIRE

    Lara-Hidalgo Catalina; Vargas-Casas Gina Milena; Salcedo-Monsalve Alejandra

    2012-01-01

    We conducted a study to establish the prevalence of drugs of abuse consumption in physiciansand nurses in two health institutions in Bogota outpatient identify the frequency of consumption,to establish the prevalence of alcoholism using the CAGE questionnaire and explore the interestparticipate in prevention or reduction of consumption in the workplace. Materials and methods: Across-sectional study by applying an anonymous survey. Results: There were 58 questionnaires (38in physicians and 20 ...

  9. (Colombia 2010

    Directory of Open Access Journals (Sweden)

    Sandra Constanza Cañón

    2011-01-01

    Full Text Available El presente estudio pretende indagar sobre las prácticas y comportamientos sexuales en una población universitaria, ya que comportamientos positivos pueden desarrollar mejores habilidades para la prevención de conductas de alto riesgo, mayor satisfacción sexual y, por ende, vivir más plenamente. La presente investigación es de tipo transversal y en ella participaron estudiantes de todas las facultades de la Universidad de Manizales (Caldas, Colombia, que estaban cursando entre primero y noveno semestre. La muestra de esta investigación la constituyeron 267 personas sobre una población de 3600 estudiantes regulares; se obtuvo mediante un muestreo probabilístico estratificado por género y facultad. La edad media fue de 21.69 años; la mayor proporción fue de mujeres en un 58.8%; 1.5% eran homosexuales y un 5%, bisexuales, el método de anticoncepción más usado fueron los métodos de barrera en un 41.3%; el 15.2% habían tenido alguna infección de transmisión sexual. En lo que se refiere a las prácticas sexuales el 22.8% realizan todas las prácticas (masturbación, sexo oral, sexo anal, sexo vaginal; en cuanto al promedio de edad de inicio de relaciones sexuales fue de 16.09 años; están de acuerdo con la despenalización total del aborto en un 53.1%; el 73.2% adoptan una posición de aceptación y tolerancia hacia la homosexualidad. El estudio permitió ver la influencia de varias variables como género, familia, religión y formación educativa sobre el comportamiento y la práctica sexual responsable.

  10. 75 FR 63040 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-30, DC...

    Science.gov (United States)

    2010-10-14

    ... Corporation Model DC- 10-10, DC-10-10F, DC-10-30, DC-10-30F (KDC-10), DC-10-40, and DC-10-40F Airplanes AGENCY...-10F, DC-10-30, DC-10-30F (KDC-10), DC-10-40, and DC-10- 40F airplanes, certificated in any category...

  11. Counterterrorism policy in Colombia

    OpenAIRE

    Self, Kevin A.

    2007-01-01

    The purpose of this thesis is to suggest a coherent, credible, and long-term counterterrorism policy in Colombia. The events of September 11, 2001 heightened U.S. awareness of Colombian terrorist organizations, the most powerful being the Revolutionary Armed Forces of Colombia (FARC). The U.S. counterterror approach in Colombia appears fragmented, with only minor changes to its previous drug control policies. In contrast, the Colombian government has developed and implemented a policy to ...

  12. Counterterrorism Policy in Colombia

    Science.gov (United States)

    2007-06-01

    transport abroad to intermediary points such as Mexico or to final destinations, such as the U.S. or Europe; sale in large quantities; sale in small...Group, "War and Drugs in Colombia," 12. 66 Raúl Reyes and others, "Memorando al gobierno nacional sobre la Paz y el futuro de Colombia," FARC-EP...92 Connie Veillette, "Plan Colombia," (2005): 9. 93 Ibid., 9-10. 94 "Informe Especial: La Seguridad en los

  13. Programmable dc motor controller

    Science.gov (United States)

    Hopwood, J. E.

    1982-11-01

    A portable programmable dc motor controller, with features not available on commercial instruments was developed for controlling fixtures during welding processes. The controller can be used to drive any dc motor having tachometer feedback and motor requirements not exceeding 30 volts, 3 amperes. Among the controller's features are delayed start time, upslope time, speed, and downslope time.

  14. Multilevel DC link inverter

    Science.gov (United States)

    Su, Gui-Jia

    2003-06-10

    A multilevel DC link inverter and method for improving torque response and current regulation in permanent magnet motors and switched reluctance motors having a low inductance includes a plurality of voltage controlled cells connected in series for applying a resulting dc voltage comprised of one or more incremental dc voltages. The cells are provided with switches for increasing the resulting applied dc voltage as speed and back EMF increase, while limiting the voltage that is applied to the commutation switches to perform PWM or dc voltage stepping functions, so as to limit current ripple in the stator windings below an acceptable level, typically 5%. Several embodiments are disclosed including inverters using IGBT's, inverters using thyristors. All of the inverters are operable in both motoring and regenerating modes.

  15. [Case study: school meals' management in Santiago de Cali and Bogota].

    Science.gov (United States)

    Díaz, Mónica del Pilar; Montoya, Iván A; Montoya, Luz A

    2011-10-01

    This research was aimed at ascertaining the state's role regarding hunger and how it manages to combat this matter; a food security program in two Colombian cities was thus assessed (i.e. school meals' provision in Cali and Bogota). A qualitative approach was adopted; documentary analysis, participant observation and in-depth interviews with various actors for both selected cases were used as data collection techniques. It was found that several measures taken in this area were not covered by regulatory principles aimed at covering all the dimensions of food security. Serious weaknesses in school meals' management in Cali were associated with a weak environment regarding the fight against hunger. School meals' management in Bogotá was aimed at recognizing the right to food as being supported by an institutional process where the issue of reducing hunger has become a firm purpose. School meals' program management was associated with the characteristics of its product, thereby affecting the program and the population's food and nutritional status; state management thus becomes another dimension of food security.

  16. Critical revision of the technical aspects of sanitation of the Bogota river 1994 project

    International Nuclear Information System (INIS)

    Giraldo Eugenio

    1996-01-01

    A moral obligation exists on the part of the human societies of having designed to remove the contamination the environment that has been commended to manage and that it represents the inheritance that guarantees the survival of the species in the earth planet. It exists a growing recognition of this imperious necessity at the present time on the part of all the societies in the world that immediately opens the roads for the political exploitation of so praiseworthy feelings. Paradoxically, the environmentalist feelings don't always redound in a better protection for the nature and the environment, natural or urban. The reparation plan to continue for the Decontamination of the Bogot River; hired by the concession system the first stage of the same one, it is summarized in making three plants of treatment of located residual waters, each one of them in the outlets on the Bogota river of the main basins of drainage of the sanitary sewer system of the city. The treatment plants are of a conventional technology, mud activated that basically are designed to remove 90% of the contamination for organic matter that takes the sanitary sewer system of the respective basin. This level of achieved treatment is denominated in the technical literature as secondary treatment

  17. Implementation of a WRF-CMAQ Air Quality Modeling System in Bogotá, Colombia

    Science.gov (United States)

    Nedbor-Gross, R.; Henderson, B. H.; Pachon, J. E.; Davis, J. R.; Baublitz, C. B.; Rincón, A.

    2014-12-01

    Due to a continuous economic growth Bogotá, Colombia has experienced air pollution issues in recent years. The local environmental authority has implemented several strategies to curb air pollution that have resulted in the decrease of PM10 concentrations since 2010. However, more activities are necessary in order to meet international air quality standards in the city. The University of Florida Air Quality and Climate group is collaborating with the Universidad de La Salle to prioritize regulatory strategies for Bogotá using air pollution simulations. To simulate pollution, we developed a modeling platform that combines the Weather Research and Forecasting Model (WRF), local emissions, and the Community Multi-scale Air Quality model (CMAQ). This platform is the first of its kind to be implemented in the megacity of Bogota, Colombia. The presentation will discuss development and evaluation of the air quality modeling system, highlight initial results characterizing photochemical conditions in Bogotá, and characterize air pollution under proposed regulatory strategies. The WRF model has been configured and applied to Bogotá, which resides in a tropical climate with complex mountainous topography. Developing the configuration included incorporation of local topography and land-use data, a physics sensitivity analysis, review, and systematic evaluation. The threshold, however, was set based on synthesis of model performance under less mountainous conditions. We will evaluate the impact that differences in autocorrelation contribute to the non-ideal performance. Air pollution predictions are currently under way. CMAQ has been configured with WRF meteorology, global boundary conditions from GEOS-Chem, and a locally produced emission inventory. Preliminary results from simulations show promising performance of CMAQ in Bogota. Anticipated results include a systematic performance evaluation of ozone and PM10, characterization of photochemical sensitivity, and air

  18. 75 FR 38943 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-30, DC...

    Science.gov (United States)

    2010-07-07

    ... Corporation Model DC- 10-10, DC-10-10F, DC-10-30, DC-10-30F (KDC-10), DC-10-40, and DC-10-40F Airplanes AGENCY... propose to adopt a new airworthiness directive (AD) for certain Model DC-10-10, DC-10-10F, DC-10-30, DC-10-30F (KDC-10), DC-10- 40, and DC-10-40F airplanes. This proposed AD would require installing a support...

  19. 75 FR 79440 - Additional Designations, Foreign Narcotics Kingpin Designation Act

    Science.gov (United States)

    2010-12-20

    ... (Colombia) (individual) [SDNTK] 4. GALEANO JEREZ, Nohora, c/o ADN CONSULTORES LTDA., Bogota, Colombia; DOB...-07, Bogota, Colombia; Matricula Mercantil No 1978075 (Colombia) [SDNTK] 2. ADN CONSULTORES LTDA...

  20. 78 FR 47489 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to the Foreign...

    Science.gov (United States)

    2013-08-05

    ... Pompeyo, c/o COLCHONES SUNMOONS LTDA, Bogota, Colombia; DOB 29 Nov 1965; POB Ubala, Cundinamarca, Colombia...]. Entities 1. COLCHONES SUNMOONS LTDA, Carrera 50 No. 37-45 Sur, Bogota, Colombia; NIT 830073142-1 (Colombia...

  1. A pollen diagram from “Laguna de la Herrera” (Sabana de Bogota)

    NARCIS (Netherlands)

    Hammen, van der T.; Gonzalez, E.

    1965-01-01

    The Laguna de La Herrera (alt. ca 2550 m) is a lake situated on the western border of the Sabana de Bogotá, near Mosquera (dept. of Cundinamarca, Colombia) (fig. 2). This part of the Sabana has a relatively dry climate (appr. 600—700 mm rainfall), as it lies in the rain-shadow of the hills that

  2. El IDRC en Colombia

    International Development Research Centre (IDRC) Digital Library (Canada)

    Duración: 2008–2012. Beneficiario: Fundación Para la Educación y el Desarrollo Social, Colombia. Aunque enfermedades crónicas como el cáncer y la diabetes son hoy la causa principal de muerte en Colombia y otras partes del mundo, tradicionalmente han sido descuidadas. Gracias al Premio de la Iniciativa Global de.

  3. Colombia: Issues for Congress

    National Research Council Canada - National Science Library

    Veillette, Connie

    2005-01-01

    ... into sharper focus after the attacks of September 11, 2001. The United States has made a significant commitment of funds and material support to help Colombia and the Andean region fight drug trafficking since the development of Plan Colombia in 1999...

  4. Colombia: Issues for Congress

    Science.gov (United States)

    2011-03-18

    Suelo y la Competividad del Sector Agrario Colombiano, 2004. Colombia: Issues for Congress Congressional Research Service 4 Colombia is a...the oil, manufacturing and mining sectors . Nevertheless, income inequality and land ownership concentration are still significant problems.6 Drug...rural civilian population, the ELN has targeted the country’s infrastructure, especially its oil and electricity sectors . Its operations are mainly

  5. Arms Trafficking and Colombia

    Science.gov (United States)

    2003-01-01

    chronology of the intensification of violence in the area, see Noche Y Niebla: Panorama De Derechos Humanos Y Violencia Politica En Colombia, Bogotá...Arms, London, UK: Zed Books, 2000, pp. 155–178. Noche Y Niebla: Panorama De Derechos Humanos Y Violencia Politica En Colombia, Bogotá: Cinep & Justicia

  6. Radiation-Tolerant DC-DC Converters

    Science.gov (United States)

    Skutt, Glenn; Sable, Dan; Leslie, Leonard; Graham, Shawn

    2012-01-01

    A document discusses power converters suitable for space use that meet the DSCC MIL-PRF-38534 Appendix G radiation hardness level P classification. A method for qualifying commercially produced electronic parts for DC-DC converters per the Defense Supply Center Columbus (DSCC) radiation hardened assurance requirements was developed. Development and compliance testing of standard hybrid converters suitable for space use were completed for missions with total dose radiation requirements of up to 30 kRad. This innovation provides the same overall performance as standard hybrid converters, but includes assurance of radiation- tolerant design through components and design compliance testing. This availability of design-certified radiation-tolerant converters can significantly reduce total cost and delivery time for power converters for space applications that fit the appropriate DSCC classification (30 kRad).

  7. Forback DC-to-DC converter

    Science.gov (United States)

    Lukemire, Alan T.

    1995-05-01

    A pulse-width modulated DC-to-DC power converter including a first inductor, i.e. a transformer or an equivalent fixed inductor equal to the inductance of the secondary winding of the transformer, coupled across a source of DC input voltage via a transistor switch which is rendered alternately conductive (ON) and nonconductive (OFF) in accordance with a signal from a feedback control circuit is described. A first capacitor capacitively couples one side of the first inductor to a second inductor which is connected to a second capacitor which is coupled to the other side of the first inductor. A circuit load shunts the second capacitor. A semiconductor diode is additionally coupled from a common circuit connection between the first capacitor and the second inductor to the other side of the first inductor. A current sense transformer generating a current feedback signal for the switch control circuit is directly coupled in series with the other side of the first inductor so that the first capacitor, the second inductor and the current sense transformer are connected in series through the first inductor. The inductance values of the first and second inductors, moreover, are made identical. Such a converter topology results in a simultaneous voltsecond balance in the first inductance and ampere-second balance in the current sense transformer.

  8. A DC Transformer

    Data.gov (United States)

    National Aeronautics and Space Administration — The goal of the project was to demonstrate a true direct current (DC) transformer, a new electro-mechanical component with potentially high power applications; in...

  9. Synchronous DC Power Supply.

    Science.gov (United States)

    The patent describes a synchronous direct current (dc) power supply which has the power supply input drive synchronized with the pulse repetition...frequency (PRF) of the amplifying or load circuit requiring the dc power for operation. This limits the occurrence of ripple components in the power ... supply output to the spectral positions of the PRF lines, eliminating ripple interference with signal processing in the load. An astable multivibrator is

  10. Impact of payroll taxes for small shoe manufacturing enterprises profit generation in Bogota city 15th district

    Directory of Open Access Journals (Sweden)

    José Armando Hernández Bernal

    2016-04-01

    Full Text Available In this paper we illustrate the financial difficulties that payroll taxes would impose on small shoe manufacturing enterprises in Bogota City 15th district and how this would impose some restrictions for firms profit generation, when such contributions turns out to be a fixed cost. We present a brief on the legal framework as well as an econometric exercise that shows the relations between labor costs and profit generation for the footwear industry in the 15th urban district of Bogotá city.

  11. Sleep disorders and sleep quality in female victims of rape in Bogota

    Directory of Open Access Journals (Sweden)

    Franklin Escobar Córdoba

    2006-01-01

    Full Text Available Background: sleep disorders area present in victims of sexual assault, being important to determinc ist possible frequency, comorbidity and associations. Objective: to determine the prevalence of sleep disorders and explore the sleep quality in a group of female victims of rape in Bogota. Material and methods: a cross-sectional descriptive study was conducted in 2004 with a sample of female victims of rape who provided their consent to participate in the study. Nationwide validated self-rating scales were used as measures: Pittsburgh Sleep Quality Index and Epworth Sleepiness Scale. Results. The young women who were recruited had the following characteristics: they had a low-moderate socio-economical condition; the majority had no partner; mean height = 1.59 m. (IC 95%=1.55-1.61; mean weight = 52 Kg. (IC 95%=48.77-55.45 and mean BMI=21.28 (IC 95%= 20.16-21.77. Daily excessive somnolence was found in 10/34 (29.41% victims; low quality of sleep, in 22/34 (64.71% victims; reduced sleep efficiency, in 18/34 (52.94% victims; sleep perturbations, in 20/34 (52.94%; presumptive symptoms of respiratory sleep disorders and consumption of hypnotics, in 9/34 (26.47% victims; and insomnia and nightmares in 23/34 (67.65% victims. These findings are similar to others reported by different authors. Conclusion. The prevalence of sleep disorders and the disturbance of quality of sleep in the study sample were quantitatively significant and similar to other studies.

  12. Three new DC-to-DC Single-Switch Converters

    Directory of Open Access Journals (Sweden)

    Barry W. Williams

    2017-06-01

    Full Text Available This paper presents a new family of three previously unidentified dc-to-dc converters, buck, boost, and buck-boost voltage-transfer-function topologies, which offer advantageous transformer coupling features and low capacitor dc voltage stressing. The three single-switch, single-diode, converters offer the same features as basic dc-to-dc converters, such as the buck function with continuous output current and the boost function with continuous input current. Converter time-domain simulations and experimental results (including transformer coupling support and extol the dc-to-dc converter concepts and analysis presented.

  13. 75 FR 21153 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2010-04-22

    ... INVERSIONES RODRIGUEZ MORENO Y CIA. S. EN C., Cali, Colombia; c/o DEPOSITO POPULAR DE DROGAS S.A., Cali, Colombia; c/o DISTRIBUIDORA DE DROGAS CONDOR LTDA., Bogota, Colombia; DOB 5 Feb 1953; Cedula No. 19194691..., Colombia; c/o DISTRIBUIDORA DE DROGAS CONDOR S.A., Bogota, Colombia; c/o COOPCREAR, Bogota, Colombia; DOB 2...

  14. Macroinvertebrate trophic groups in an Andean wetland of Colombia

    International Nuclear Information System (INIS)

    Rivera Usme, John Jader; Pinilla Agudelo, Gabriel Antonio; Camacho Pinzon, Diana Lucia

    2013-01-01

    In the wetland Jaboque (Bogota, Colombia) the physical and chemical properties of the water and the food dietary guilds of the aquatic macroinvertebrate community were analyzed from April 2009 to January 2010. The wetland waters had a slightly acid character with high values of nitrate, ammonia and orthophosphate, so this ecosystem is classified as eutrophic to hypereutrophic. In the aquatic macroinvertebrate community six food groups were recorded; they were confirmed by 27 families, 26 confirmed genera and nine to be confirmed, with a total of 6,403 individuals collected in 28 samples of macrophytes. the highest abundances corresponded to detritivores (43.5 %), collector-scrapers (31.5 %), and collector-shredders (14.1 %), which were more abundant in the months of low rainfall. stomach contents of some of the organisms showed that most of these individuals consumed more than one food type and high amounts of organic matter. Detrended correspondence analysis (DCA) showed a spatial (stations) and temporal (climatic seasons) organization, in which trophic guilds are grouped according to their niche requirements, environmental fluctuations or anthropogenic factors. variations in dietary groups reflected changes in the macroinvertebrate community from a functional perspective and indicated that the wetland is very disturbed by urban activities.

  15. [Colombia 2015 National Mental Health Survey. Study Protocol].

    Science.gov (United States)

    Gómez-Restrepo, Carlos; de Santacruz, Cecilia; Rodriguez, María Nelcy; Rodriguez, Viviana; Tamayo Martínez, Nathalie; Matallana, Diana; Gonzalez, Lina M

    2016-12-01

    The 2015 National Mental Health Survey (NMHS) is the fourth mental survey conducted in Colombia, and is part of the National System of Surveys and Population Studies for health. A narrative description is used to explain the background, references, the preparation, and characteristics of the 2015 NMHS. The 2015 NMHS and its protocol emerge from the requirements that support the national and international policies related to mental health. Together with the Ministry of Health and Social Protection, the objectives, the collection tools, the sample, and the operational plan are defined. The main objective was to obtain updated information about the mental health, mental problems and disorders, accessibility to health services, and an evaluation of health conditions. Participants were inhabitants from both urban and rural areas, over 7 years old, and in whom the comprehension of social determinants and equity were privileged. An observational cross-sectional design with national, regional and age group representativity, was used. The age groups selected were 7-11, 12-17, and over 18 years old. The regions considered were Central, Orient, Atlantic, Pacific, and Bogota. The calculated sample had a minimum of 12,080 and a maximum of 14,496 participants. A brief summary of the protocol of the 2015 NMHS is presented. The full document with all the collection tools can be consulted on the Health Ministry webpage. Copyright © 2016. Publicado por Elsevier España.

  16. The bamboo in Colombia

    Directory of Open Access Journals (Sweden)

    Ximena Londoño

    2011-07-01

    Full Text Available Bamboo is a self-sustaining plant of fast growing which works in network. With the bamboo can be solved the environmental, social and economic problems affecting a place, a country or region. Colombia is the second country in America in bamboo, after Brazil, with 18 genera, 105 species. This paper describes the development of bamboo / guadua in Colombia over the past 25 years, noting the factors that have contributed positively to its development. This paper describes the diversity of Bambusoideae in Colombia and highlights the priority species with emphasis in Guadua angustifolia Kunth, the most used and promising species. Key words: Bambusoideae, Guadua angustifolia

  17. Calentamiento global en Colombia

    OpenAIRE

    Duque Escobar, Gonzalo

    2011-01-01

    En atención a los conocidos eventos invernales que asolan la Patria, me he permitido adaptar este material sobre los efectos del Calentamiento global para el caso de Colombia, a partir de una conferencia que titulara Cambio climático y turismo en Colombia (2008), como una colaboración de la Universidad Nacional de Colombia Sede Manizales para conmemorar el Día Mundial del Medio Ambiente, invitando a reflexionar sobre la importancia de la adaptación ambiental.

  18. 75 FR 68246 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-15, DC...

    Science.gov (United States)

    2010-11-05

    ... Corporation Model DC- 10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F... to supersede an existing airworthiness directive (AD) that applies to all Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, MD-10- 10F, MD-10-30F, MD-11...

  19. 75 FR 20790 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-15, DC...

    Science.gov (United States)

    2010-04-21

    ... Corporation Model DC- 10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F... (AD) for certain Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC- 10A and KDC-10), DC-10-40, DC-10-40F, MD-10-10F, MD-10-30F, MD-11, and MD-11F airplanes. This proposed AD would require...

  20. 75 FR 23571 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-15, DC...

    Science.gov (United States)

    2010-05-04

    ... Corporation Model DC- 10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F.... ACTION: Final rule. SUMMARY: We are adopting a new airworthiness directive (AD) for certain Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, MD-10-10F, MD...

  1. 75 FR 60602 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-15, DC...

    Science.gov (United States)

    2010-10-01

    ... Corporation Model DC- 10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F.... ACTION: Final rule. SUMMARY: We are adopting a new airworthiness directive (AD) for certain Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, MD-10-10F, MD...

  2. Contribución al conocimiento de los Machiloidea de Colombia (Archaeognatha: Insecta Contribución al conocimiento de los Machiloidea de Colombia (Archaeognatha: Insecta

    Directory of Open Access Journals (Sweden)

    Sturm Helmut

    1983-09-01

    Full Text Available Se describen cuatro nuevas especies y una subespecie de Meinertellidae recolectadas en Colombia y en un bosque pluvial cerca de Manaos, Brasil. Son las siguientes: Meinertellus adisi, M. bogotensis santaemartae, Neomachilellus aboucbaari, N. amazonicus y N. rangeli. Se discute la posición sistemática de los ejemplares recolectados cerca de Bogotá, en el valle del río Magdalena y en la Cordillera Oriental cerca de Neiva. Se da una clave para los géneros suramericanos de la familia.Four new species and one new subspecies of Meinertellidae occurring respectively in Colombia and in the rain forest near Manaus, Brazil, are described:  Meinertellus adisi, M. bogotensis santaemartae , Neomachilellus abouchaari, N. amazonicus and N. rangeli. The systematical position of specimens collected near Bogota, in the Magdalena Valley and in the Eastern Andes near Neiva is discussed. A key for the South American genera of the family is given.

  3. Characteristics of the technical parameters in the realization of computed tomography studies in pediatric patients in Bogota

    International Nuclear Information System (INIS)

    Triana, Gustavo; Romero, Javier; Rivero, Oscar; Sosa, Daniel; Patarroyo, Edith

    2005-01-01

    The use of Computed Tomography (CT) examinations for the diagnosis of common pathologies in pediatric patients has increase. This implies an increase in the radiation doses that pediatric patients received, therefore increasing the risk of secondary mortality due to cancer throughout life. In recent papers, the recommended radiation doses for pediatric patients in agreement with the concept ALARA (As Low As Reasonably Achievable) has settled down. This study evaluates the CT technical parameters of pediatric examinations in Bogota city, and review if they have been fitted with parameters recommended according to age and body weight. Materials and methods: A non-probabilistic sampling of 46 scanning tests were applied to children in six different institutions in Bogota; the technical parameters of kv and second mAs were checked of studies in abdomen, thorax and skeletal muscle system. Results: It was found that the technical parameters used in TC in children are higher of the recommended; the group of 4-year-old is the most affected by dos e of unnecessary radiation. Discussion and conclusions: The information from the protection of the radiation must be spread to the whole radiology personnel of the institutions that fulfill scanning tests of pediatric patients. ar zones that influences the wetland

  4. Dental education in Colombia.

    Science.gov (United States)

    Jaramillo, Jorge A; Pulido, Jairo H Ternera; Castro Núñez, Jaime A; Bird, William F; Komabayashi, Takashi

    2010-03-01

    This article describes Colombia's development of formal dentistry, its dental school system, curriculum, and dental licensure, and current issues in oral health care. In 1969, there were only 4 dental schools in Colombia; at this writing there are 21. Five dental schools are public and the other 16 are private. Nearly all classes are conducted in Spanish. Undergraduate pre-dental coursework is not a prerequisite for dental school in Colombia. To obtain licensure, Colombian dental students must complete 5 years of study in dental school, earn a diploma, and work for the government for 1 year. There are approximately 41,400 dentists in Colombia, and the number is increasing quickly. However, the unemployment rate among dentists is very high, even though graduation from dental school is extremely difficult. Although the 1,100:1 ratio of citizens to dentists is considered satisfactory, access to dental care is limited due to the high rate of poverty.

  5. Colombia: Issues for Congress

    National Research Council Canada - National Science Library

    Veillette, Connie

    2005-01-01

    .... The Congress has expressed concern with respect to a number of Colombia-related issues including human rights, the aerial eradication of illicit drug crops, interdiction programs, the situation of U.S...

  6. Strategic ecosystems of Colombia

    International Nuclear Information System (INIS)

    Marquez Calle German

    2002-01-01

    The author relates the ecosystems in Colombia, he makes a relationship between ecosystems and population, utility of the ecosystems, transformation of the ecosystems and poverty and he shows a methodology of identification of strategic ecosystems

  7. Dental education in Colombia

    Science.gov (United States)

    Jaramillo, Jorge A.; Pulido, Jairo H. Ternera; Núñez, Jaime A. Castro; Bird, William F.; Komabayashi, Takashi

    2014-01-01

    This article describes Colombia's development of formal dentistry, its dental school system, curriculum, and dental licensure, and current issues in oral health care. In 1969, there were only 4 dental schools in Colombia; at this writing there are 21. Five dental schools are public and the other 16 are private. Nearly all classes are conducted in Spanish. Undergraduate pre-dental coursework is not a prerequisite for dental school in Colombia. To obtain licensure, Colombian dental students must complete 5 years of study in dental school, earn a diploma, and work for the government for 1 year. There are approximately 41,400 dentists in Colombia, and the number is increasing quickly. However, the unemployment rate among dentists is very high, even though graduation from dental school is extremely difficult. Although the 1,100:1 ratio of citizens to dentists is considered satisfactory, access to dental care is limited due to the high rate of poverty. PMID:20339245

  8. Colombia: Issues for Congress

    National Research Council Canada - National Science Library

    Veillette, Connie

    2005-01-01

    Recent debate on U.S. policy toward Colombia has taken place in a context of concern for the volume of drugs readily available in the United States and elsewhere in the world, and security concerns that have come...

  9. Design and Testing of Boost Type DC/DC Converter for DC Motor Control Applications

    OpenAIRE

    Samman, Faizal Arya; Akil, Yusri Syam; Noor, Nirwan A.

    2017-01-01

    in The Proceeding of The 2nd International Symposium on Smart Material and Mechatronics 2015 This paper presents the design and testing of a boost type DC/DC converter circuit, which can be used for DC motor control applications. The Boost converter is designed using DC chopper and DC chopper cascade configurations. The experimental setup was made by connecting the boost converter circuit with four types of DC motor, i.e. self-excited DC motor shunt, series, compound and separately exci...

  10. Shadow Toll in Colombia

    OpenAIRE

    González Ruiz, Juan David; Botero Botero, Sergio; Arboleda, Carlos Alejandro; Duque Grisales, Eduardo Alexander

    2015-01-01

    The growing development in infrastructure projects in Colombia has been linked to legal adjustments and capital markets. These two last factors have provided important elements for project developers to design funding strategies. Based on the shadow toll scheme, this paper proposes a new financing strategy for funding highway projects. This strategy may be implemented in Colombia. Finally, the paper proposes future research on shadow toll schemes as a financial mechanism.

  11. Overview of Multi-DC-Bus Solutions for DC Microgrids

    DEFF Research Database (Denmark)

    Ricchiuto, D.; Mastromauro, R.A.; Liserre, Marco

    2013-01-01

    DC Microgrids have recently received a lot of attention in the last years due to high penetration of renewable energy sources as well as distributed energy storage systems. In the future DC microgrids could be preferable respect to AC microgrids in terms of redundancy since multi-DC-Bus solutions...... could provide a continuative power supply to the loads. An overview of Multi-DC-Bus solutions is presented in this paper. The performances are compared on the basis of possible DC microgrid configurations, redundancy, different DC voltage levels....

  12. Finding common ground: redefining women's work in Colombia.

    Science.gov (United States)

    Donaldson, J K

    1992-01-01

    Colombia's women's organizations which help household workers are profiled. In Bogota the Asociacion de Mujeres Trabajadoras del Hogar (AMUTRAHOGAR) provides legal counseling, educational courses, and a friendly gathering place. The experiences of several women are highlighted, e.g., Emma Ojeda comes to the weekly meetings for legal and moral support. AMUTRAHOGAR is an alliance of unskilled and largely rural workers and professional and urban women who are concerned with the joint recognition of the importance of domestic service. The stigma is by gender, social rank, and sometimes race. This informal economy does not have very accurate figures on workers. The estimate is half a million of mostly rural migrants. Another important organization is the Asociacion Colombiana para el Estudio de la Poplacion (ACEP) which is a nongovernmental organization in Bogota begun in 1981. The aim was to review existing labor laws and evaluate how well the code was meeting women's needs. Magdalena Leon has been a research sociologist studying women's issues for 20 years through ACEP. ACEP has worked with the Sindicato de Trabajadoras del Servicio Domesticao (SINTRASEDOM) which represents and lobbies for household workers. Violation of the law on live-ins, wages, and time off duty was discovered a common occurrence. In the application of the law, employers found loopholes, and, for instance, subtracted food, clothing, and shelter which left little pocket money. The ACEP program was expanded to other cities in 1983. Program expansion included informal courses on citizenship, sexuality, and the role of women in Colombian society. When the social security code was reformed in 1977, household workers became eligible for benefits, but many employers were unaware of it. The law also excluded those with wages under the minimum wage. A public campaign was begun in 1985 by ACEP and SINTRASEDOM to inform people about the law. Community action was disrupted by unrelated political violence and

  13. Chemical speciation of Pb, Ni Cr, Cu, Co and V in two natural soils and in an antropic agricultural soil contaminated by irrigation with the polluted Rio Bogota waters in its High Basin

    International Nuclear Information System (INIS)

    Matamoros, Adriana; Vargas, O; Mejia, L

    1999-01-01

    Traditional and continuous irrigation with the highly polluted waters of Rio Bogota in its upper basin has induced in soils, grasses and crops grown next to the river, a gradually increasing accumulation of highly toxic elements like Pb, Ni, Cr, Cu, Cd, Co, V and some others, which represents a real and very high risk for public health whenever grasses and edible crops growing on them absorb these elements above critical or permissible limits. To evaluate the magnitude of this problem three different soils of the Sabana were subjected to the chemical speciation procedure proposed by Tessier (1979) in order to determine: 1) the total content of essential and/or structural elements like Al, Fe, Ca, K, P, Mn and Ti, and the trace elements Pb, Ni, Cr, Cu, Cd, Co and V accumulated through time in the soils; 2) the relative proportion on which each one of them are linked to the different components or fractions of soils (ex. exchangeable, CO 3 , Fe/Mn oxides, O.M. and sulfides, and residual fraction) and 3) the bioavailability or amount of each that could be really absorbed by plants or able to go down to the underground water. Results showed in general for all soils normal values for the essential and/or structural elements and high to very high levels of Pb, Ni, Cu, Cd, Cr, Co y V, higher in Jardines de Colombia and Las Parcelas farms soils than in el Recreo farm soils. This situation is aggravated by the relatively high mobility and high concentration and bioavailability of some of these elements, which increase the risk for public health and the possibility of its migration down to the underground waters

  14. Asociacion de leveduras del genero Cryptococcus con especies de Eucalyptus en Santafe de Bogota Isolation of Cryptococcus sp. associated with Eucalyptus trees in Santafé de Bogota

    Directory of Open Access Journals (Sweden)

    A. Duarte

    1994-04-01

    Full Text Available El aislamiento de Cryptococcus neoformans var. gattii, serotipo B, a partir del medio ambiente se estableció inicialmente en Australia en 1989, en asocio con el Eucalyptus camaldulensis y posteriormente con E. tereticornis. Con estos hallazgos se postuló que desde allí, el hongo se ha podido exportar, por medio de las semillas contaminadas, a otras regiones geográficas, incluyendo Colombia. El objetivo de éste estudio fue identificar las levaduras del género Cryptococcus asociadas con especies de Eucalyptus sp., como primera evaluación en la ecología de C. neoformans var. gattii en nuestro país. Se realizó en Santafé de Bogotá, con una población de 100 árboles ubicados al centro, nororiente, oriente y occidente de la ciudad, recolectando de cada uno de ellos flores, frutos, hojas, cortezas y detritos; el procesamiento de las muestras incluyó extracción del material con una solución salina con antibióticos, siembra en medios selectivos e identificación de las especies con base en las características morfológicas, macro y microscópicas y bioquímicas. Se aislaron 27 cepas de Cryptococcus pertenecientes a 9 especies de Cryptococcus, a partir de 21 árboles ubicados en 5 zonas diferentes de la ciudad. Se aisló C. neoformans y se identificó como C. neoformans var. neoformans serotipo A. Estos datos iniciales son importantes como primera evaluación de la asociación de Cryptococcus sp. con los Eucalyptus en nuestro país.Environmental isolation of Cryptococcus neoformans var. gattii was first made in Australia in 1989 by ELLIS. He established a specific association with the tree species Eucalyptus camaldulensis and E. tereticornis. Based on his findings, ELLIS proposed that the fungus could be exported from Australia to others regions, including Colombia, by means of infected seeds. The purpose of this study was to isolate and identify Cryptococcus sp., associated with Eucalyptus trees; this is the first ecological evaluation

  15. DC arc weld starter

    Science.gov (United States)

    Campiotti, Richard H.; Hopwood, James E.

    1990-01-01

    A system for starting an arc for welding uses three DC power supplies, a high voltage supply for initiating the arc, an intermediate voltage supply for sustaining the arc, and a low voltage welding supply directly connected across the gap after the high voltage supply is disconnected.

  16. First record of Takecallis taiwana (Takahashi) and T. arundinariae (Essig) (Hemiptera: Aphididae) in Colombia

    Science.gov (United States)

    The aphids Takecallis taiwanus (Takahashi, 1926) and T. arundinariae (Essig, 1917) were collected from two locations in the Department of Cundinamarca and one in Bogotá D.C. within 90km of the city of Bogotá, Colombia. These represent the first records from the northern half of South America. All th...

  17. dc Arc Fault Effect on Hybrid ac/dc Microgrid

    Science.gov (United States)

    Fatima, Zahra

    The advent of distributed energy resources (DER) and reliability and stability problems of the conventional grid system has given rise to the wide spread deployment of microgrids. Microgrids provide many advantages by incorporating renewable energy sources and increasing the reliability of the grid by isolating from the main grid in case of an outage. AC microgrids have been installed all over the world, but dc microgrids have been gaining interest due to the advantages they provide over ac microgrids. However the entire power network backbone is still ac and dc microgrids require expensive converters to connect to the ac power network. As a result hybrid ac/dc microgrids are gaining more attention as it combines the advantages of both ac and dc microgrids such as direct integration of ac and dc systems with minimum number of conversions which increases the efficiency by reducing energy losses. Although dc electric systems offer many advantages such as no synchronization and no reactive power, successful implementation of dc systems requires appropriate protection strategies. One unique protection challenge brought by the dc systems is dc arc faults. A dc arc fault is generated when there is a gap in the conductor due to insulation degradation and current is used to bridge the gap, resulting in an arc with very high temperature. Such a fault if it goes undetected and is not extinguished can cause damage to the entire system and cause fires. The purpose of the research is to study the effect of the dc arc fault at different locations in the hybrid ac/dc microgrid and provide insight on the reliability of the grid components when it is impacted by arc faults at various locations in the grid. The impact of dc arc fault at different locations on the performance of the PV array, wind generation, and constant power loads (CPL) interfaced with dc/dc converters is studied. MATLAB/Simulink is used to model the hybrid ac/dc microgrid and arc fault.

  18. Early Oscillation Detection for DC/DC Converter Fault Diagnosis

    Science.gov (United States)

    Wang, Bright L.

    2011-01-01

    The electrical power system of a spacecraft plays a very critical role for space mission success. Such a modern power system may contain numerous hybrid DC/DC converters both inside the power system electronics (PSE) units and onboard most of the flight electronics modules. One of the faulty conditions for DC/DC converter that poses serious threats to mission safety is the random occurrence of oscillation related to inherent instability characteristics of the DC/DC converters and design deficiency of the power systems. To ensure the highest reliability of the power system, oscillations in any form shall be promptly detected during part level testing, system integration tests, flight health monitoring, and on-board fault diagnosis. The popular gain/phase margin analysis method is capable of predicting stability levels of DC/DC converters, but it is limited only to verification of designs and to part-level testing on some of the models. This method has to inject noise signals into the control loop circuitry as required, thus, interrupts the DC/DC converter's normal operation and increases risks of degrading and damaging the flight unit. A novel technique to detect oscillations at early stage for flight hybrid DC/DC converters was developed.

  19. Pesticide flow analysis to assess human exposure in greenhouse flower production in Colombia.

    Science.gov (United States)

    Lesmes-Fabian, Camilo; Binder, Claudia R

    2013-03-25

    Human exposure assessment tools represent a means for understanding human exposure to pesticides in agricultural activities and managing possible health risks. This paper presents a pesticide flow analysis modeling approach developed to assess human exposure to pesticide use in greenhouse flower crops in Colombia, focusing on dermal and inhalation exposure. This approach is based on the material flow analysis methodology. The transfer coefficients were obtained using the whole body dosimetry method for dermal exposure and the button personal inhalable aerosol sampler for inhalation exposure, using the tracer uranine as a pesticide surrogate. The case study was a greenhouse rose farm in the Bogota Plateau in Colombia. The approach was applied to estimate the exposure to pesticides such as mancozeb, carbendazim, propamocarb hydrochloride, fosetyl, carboxin, thiram, dimethomorph and mandipropamide. We found dermal absorption estimations close to the AOEL reference values for the pesticides carbendazim, mancozeb, thiram and mandipropamide during the study period. In addition, high values of dermal exposure were found on the forearms, hands, chest and legs of study participants, indicating weaknesses in the overlapping areas of the personal protective equipment parts. These results show how the material flow analysis methodology can be applied in the field of human exposure for early recognition of the dispersion of pesticides and support the development of measures to improve operational safety during pesticide management. Furthermore, the model makes it possible to identify the status quo of the health risk faced by workers in the study area.

  20. 75 FR 6160 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-10, DC-10-10F, DC-10-15, DC...

    Science.gov (United States)

    2010-02-08

    ... Douglas Corporation Model DC- 10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, MD-10-10F, MD-10-30F, MD-11, and MD-11F Airplanes AGENCY: Federal Aviation... airworthiness directive (AD) for certain Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F (KC- 10A and...

  1. 75 FR 65557 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2010-10-25

    ... 2 Jan 1956; Cedula No. 16259623 (Colombia) (individual) [SDNT]. 7. HUERTAS RAMIREZ, Jorge Luis, c/o REPRESENTACIONES Y DISTRIBUCIONES HUERTAS Y ASOCIADOS S.A., Bogota, Colombia; c/o DECAFARMA S.A., Bogota, Colombia...

  2. Cultures of space and collective and participative artistic processes. recent cases in mexico city, bogota and medellin

    Directory of Open Access Journals (Sweden)

    Fernando Escobar Neira

    2012-06-01

    Full Text Available this article covers different aspects related to the spacialization of some cases of collective and participative artistic practices in specific places of three latin american cities: mexico city, bogota and medellin. therefore, the article questions the presence of different social ideologies and representations concerning the artistic field in its local and global dimensions, which establish meanings for the artistic, the political and social matters and, at the same time, fight among themselves when associating with certain contemporary artistic practices and its agents and institutions. in order to do so, it is proposed a focus that, to a certain extent, is separated from art theory and history, placing itself in a constant to and fro movement between the assumptions of artistic practices and social sciences.

  3. TOPOLOGICAL REVIEW AND ANALYSIS OF DC-DC BOOST CONVERTERS

    Directory of Open Access Journals (Sweden)

    V. INDRA GANDHI

    2017-06-01

    Full Text Available DC voltage boost up is essential in numerous applications; especially considering Photovoltaic (PV based renewable power generation system. The conventional DC-DC boost converter is the most admired configuration for this scheme, even if the converter efficiency is restricted at duty cycle near to maximum value. In order to find solution to the problem and improve its conversion capability, many converter configurations have been implemented so far. With this circumstance, this research work proposes to give overview of a few most imperative research works related to DC-DC boost converters. Some configurations are covered and classified basically based on the application. The major benefits and disadvantages related to the available techniques are also briefly conveyed. At last, a proper evaluation is recognized among the important types of DC-DC boost converters in terms of efficiency, number of components, and stability.

  4. Revisio Violacearum Colombiae

    Directory of Open Access Journals (Sweden)

    Smith Lyman B.

    1954-04-01

    Full Text Available Con el propósito de presentar un estudio crítico al Tercer Congreso Botánico Suramericano que debía celebrarse en Bogotá en el año de 1953, iniciamos en 1950 una revisión de la familia VIOLACEAE en Colombia. Aunque oportunamente se anunció que este Congreso no se realizaría, continuamos en nuestro empeño considerando que ésta sería una contribución útil al estudio de la Flora de Colombia.

  5. Promoción de la salud en la primera infancia: estrategia jardines infantiles promotores de la salud para la localidad de Santa Fe - Bogota D.C.

    OpenAIRE

    Camargo, Ramos; Tique, Zubieta

    2012-01-01

    La primera infancia ha sido considerada la fase de desarrollo más importante de todo el ciclo vital. Es un período fundamental en la constitución del ser humano, de sus competencias, habilidades y de su manera de relacionarse con el mundo. Durante la niñez se llevan a cabo importantes procesos de maduración y aprendizaje que son los que permiten interactuar, integrarse y desarrollar al máximo las potencialidades como persona. El sano desarrollo infantil, se ha relacionado con la disminución d...

  6. [Cooperative learning for improving healthy housing conditions in Bogota: a case study].

    Science.gov (United States)

    Torres-Parra, Camilo A; García-Ubaque, Juan C; García-Ubaque, César A

    2014-01-01

    This was a community-based effort at constructing an educational proposal orientated towards self-empowerment aimed at improving the target population's sanitary, housing and living conditions through cooperative learning. A constructivist approach was adopted based on a programme called "Habitat community manger". The project involved working with fifteen families living in the Mochuelo Bajo barrio in Ciudad Bolívar in Bogotá, Colombia, for identifying the most relevant sanitary aspects for improving their homes and proposing a methodology and organisation for an educational proposal. Twenty-one poor housing-related epidemiological indicators were identified which formed the basis for defining specific problems and establishing a methodology for designing an educational proposal. The course which emerged from the cooperative learning experience was designed to promote the community's skills and education regarding health aimed at improving households' living conditions and ensuring a healthy environment which would allow them to develop an immediate habitat ensuring their own welfare and dignity.

  7. Colombia: una paz esquiva

    Directory of Open Access Journals (Sweden)

    Daniel Pécaut

    2000-07-01

    Full Text Available En Colombia, el problema de la paz estuvo en el centro del debate presidencial de 1998. Un año más tarde, al terminar las conversaciones preliminares, las negociaciones propiamente dichas no habían comenzado. De hecho, desde 1995 el problema de la confron

  8. Colombia : Accounting and Auditing

    OpenAIRE

    World Bank

    2003-01-01

    This report is based on the findings of a review of accounting and auditing standards and practices in Colombia. The review exercise focused mainly on the strengths and weaknesses of the institutional framework that supports a corporate financial reporting system in the country. The current legal and regulatory requirements on accounting have led to issuance of conflicting accounting stand...

  9. Astronomy in Colombia

    Science.gov (United States)

    Higuera-G., Mario A.

    2017-07-01

    More than two centuries ago, José Celestino Mutis and Francisco José de Caldas initiated the Colombian Astronomical Expedition. Today, Colombia has a community of over 50 scientists, linked to six institutions nationwide, and more than 250 students and researchers (PhDs and Postdocs), having high-impact astronomical research around the world.

  10. Colombia: Issues for Congress

    National Research Council Canada - National Science Library

    Cook, Colleen W

    2007-01-01

    Recent debate on U.S. policy toward Colombia has taken place in a context of concern for the volume of drugs readily available in the United States and elsewhere in the world, security issues in the Andean region, and the U.S...

  11. Auxiliary resonant DC tank converter

    Science.gov (United States)

    Peng, Fang Z.

    2000-01-01

    An auxiliary resonant dc tank (ARDCT) converter is provided for achieving soft-switching in a power converter. An ARDCT circuit is coupled directly across a dc bus to the inverter to generate a resonant dc bus voltage, including upper and lower resonant capacitors connected in series as a resonant leg, first and second dc tank capacitors connected in series as a tank leg, and an auxiliary resonant circuit comprising a series combination of a resonant inductor and a pair of auxiliary switching devices. The ARDCT circuit further includes first clamping means for holding the resonant dc bus voltage to the dc tank voltage of the tank leg, and second clamping means for clamping the resonant dc bus voltage to zero during a resonant period. The ARDCT circuit resonantly brings the dc bus voltage to zero in order to provide a zero-voltage switching opportunity for the inverter, then quickly rebounds the dc bus voltage back to the dc tank voltage after the inverter changes state. The auxiliary switching devices are turned on and off under zero-current conditions. The ARDCT circuit only absorbs ripples of the inverter dc bus current, thus having less current stress. In addition, since the ARDCT circuit is coupled in parallel with the dc power supply and the inverter for merely assisting soft-switching of the inverter without participating in real dc power transmission and power conversion, malfunction and failure of the tank circuit will not affect the functional operation of the inverter; thus a highly reliable converter system is expected.

  12. PENGGUNAAN FUZZY LOGIC UNTUK KONTROL PARALLEL CONVERTER DC-DC

    Directory of Open Access Journals (Sweden)

    Bambang Prio Hartono

    2012-09-01

    Full Text Available Abstract: Using system fuzzy logic as control  technology have been used on low load dc-dc converter with combined parallel compiled  dc-dc converter can  obtain big load.   With existence of differrence of component parameter and each parallel compiled converter can obtained different current  and voltage output.  Function of controller  for to do adjustment, so that current which is applied  to  load by each converter  can be obtained  difference error as small as possible or same. The object of research is developing design of large signal dc-dc converter which is  combined with using  FLC so that  obtain  better performance.  To get better performance have been made plant model and simulation with CDE method.  The more systematic  system and design is needed to overcome bigger load  on dc-dc converter, so that parallel  compiled current master slave control system on dc-dc converter with using fuzzy logic  controller is used. Result of  research showed that error or difference of  current  which is applied to load can handled by fuzzy logic  controller.  Technic of current and voltage controller co to do adjustment current and voltage distribution  equally to load.  Distribution of iL1,iL2 and  output voltage Vo on dc-dc  converter with load 2,25 until  7,875 and voltage  100  until 120 volt,  load current beetwen  12 until 48, % relatif  error  Vo  0,4% until  0,9%.

  13. The caves of Cunday (Colombia, South America)

    NARCIS (Netherlands)

    Hammen, van der Th.; Nelson, H.W.

    1955-01-01

    A short time ago rumors reached Bogota that a big cavesystem had been discovered by some farmers in the southwest of the department of Tolima, between the villages of Cunday and Purificación. This region belongs morphologically and geologically to the Eastern Cordillera, and forms the westernmost

  14. An estimation of Iodine 131 intakes for occupational workers of nuclear medicine group at the Instituto Nacional de Cancerologia, Bogota, Colombia

    International Nuclear Information System (INIS)

    Nino, Nelcy Yasmin; Lagares, Luis Carlos; Veloza, Luz Stella; Martinez, Maria Cristina; Reyes, Amelia de los

    2008-01-01

    Full text: In nuclear medicine, unsealed radioactive substances are administered to patients for diagnosis, treatment or research. The manipulation of these radionuclides, particularly those volatile, like iodine 131 (I-131), generates a risk of internal contamination by ingestion and inhalation. The inhaled radioactive particles are retained in the lungs or uptake by the thyroid tissue and could produce health effects. The IAEA provides regulatory practices in handling radioactive material to reduce internal contamination in the staff, based on the radiation protection principle to achieve occupational doses as low as reasonably achievable (ALARA). A quality assurance program in radioprotection should include the monitoring of occupational intakes. This paper describes a pilot study which determined quantitative methods to monitoring the nuclear medicine staff. The estimates of intakes and doses of I-131 were derived from the review and interpretation of urine monitoring data, using a Ludlum model 203 Shielded Well Scintillator (2 inches diameter x 1.8 inches thick), with a ratemeter model 2200. This study included workers occupationally exposed to I-131: physicians, technicians, radio pharmacists and physicists. The initial tests of the activity levels of I-131 in urine showed an average MPBB (Maximum Permissible Body Burden) of 0.035%, i.e. 0.025 μCi. Comparing with the maximum value of whole body 0.7μCi, the percentages of I-131 MPBB indicate the presence of small activities of I-131 in the urine, suggesting low-level chronic exposures from occupational workers in Nuclear Medicine. The higher values are the medical personnel who perform treatments for thyroid disorders. Conclusion: To do statistically significant the sampling and to protect individuals in each area it should be considered the daily urinary excretion, which is due to implement a protocol for regular assessment of the levels of incorporation of iodine 131 for jobs and activities, personnel in nuclear medicine. The training of the workers in safety principles and good practice in handling iodine should be continuously reinforced. The Instituto Nacional de Cancerologia will have a Thyroid Uptake Systems Captus 3000 Capintec for direct measurements of internal contamination. (author)

  15. Factores de riesgo psicosocial en médicos de una institución prestadora de servicios de salud en Bogota-Colombia 2014

    OpenAIRE

    Mora Marín, Nubia Esperanza

    2016-01-01

    Los factores de riesgo psicosocial se pueden definir como las condiciones del individuo, del medio extra laboral o del medio laboral, que bajo determinadas condiciones de intensidad y tiempo de exposición, generan efectos negativos en el trabajador y en la organización. Objetivo: Determinar la relación entre los factores de riesgo psicosocial intralaboral, extra laboral y los síntomas de estrés en médicos de una institución prestadora de servicios de salud en la ciudad de Bogotá, duran...

  16. Adherence to Guidelines for Acute Myocardial Infarction with ST Segment Elevation in a University Hospital of 4th level in Bogota (Colombia) between January 2008 and July 2011

    OpenAIRE

    Mosquera Klinger, Gabriel Alonso; Pontificia Universidad Javeriana; García, Ángel Alberto; Hospital Universitario San Ignacio; Bohórquez Rodríguez, Ricardo; Pontificia Universidad Javeriana; Muñoz Velandia, Óscar; Pontificia Universidad Javeriana

    2014-01-01

    Introduction: The ST Segment Elevation Myocardial Infarction (STEMI) is associated with high morbidity and mortality, identifying disease early, and adherence to management guidelines have impacted clinical outcomes in this entity.Objectives: To evaluate adherence to guidelines in the management of STEMI al Hospital Universitario San Ignacio and to identify 7 performance indicators in the care of patients with STEMI.Methods: An observational, descriptive, and cross-sectional study. The statis...

  17. Music therapy intervention to promote prosociality and to reduce the risk of aggression in children of primary basic and preschool in Bogota, Colombia

    OpenAIRE

    Guevara Parra, Mónica del Pilar; Diagonal 5A No. 37B – 60 Int 16A Apto 301, Bogotá, Colombia

    2015-01-01

    Our purpose in this intervention was to promote prosociality and to reduce the aggressiveness risk between primary and preschool students by implementing music therapy sessions. A quasi experimental study was adopted, considering pre-test and pos-test, as part of a model program of early prevention of aggressiveness at a secondary level focused on a specific group of children. Eighteen subjects between 5 and 9 years old were divided into three groups. The first group received the whole music ...

  18. Basic Space Science; United Nations/European Space Agency Workshops for Developing Countries, 2nd, Bogota, Colombia, November 9-13, 1992

    Science.gov (United States)

    Haubold, Hans J. (Editor); Torres, Sergio (Editor)

    1994-01-01

    The conference primarily covered astrophysical and astronomical topics on stellar and solar modeling and processes, high magnetic field influence on stellar spectra, cosmological topics utilizing Cosmic Background Explorer (COBE) data and radioastronomic mapping as well as cosmic gravitational instability calculations, astrometry of open clusters amd solar gravitational focusing, extremely energetic gamma rays, interacting binaries, and balloon-borne instrumentation. Other papers proposed an active Search for Extraterrestrial Intelligence (SETI) communication scheme to neighboring solar-like systems and more direct involvement of and with the public in astronomy and space exploration projects.

  19. Loodushariduse mammutkongress Colombias / Aarne Tõldsepp

    Index Scriptorium Estoniae

    Tõldsepp, Aarne

    2009-01-01

    Sel suvel toimunud rahvusvahelisest matemaatika- ja loodushariduse kongressist Colombia ajaloolises sadamalinnas Cartagenas, mille peakorraldajaks oli 19 aastat tagasi Valgevenest Colombiasse emigreerunud professor Juri Orlik

  20. Interseccionalidad y políticas públicas LGBTI en Colombia: usos y desplazamientos de una noción crítica

    Directory of Open Access Journals (Sweden)

    Camila Esguerra Muelle

    2014-08-01

    Full Text Available This article offers an approach to the experiences of public policy formation that have used the concept of intersectionality, in particular, those policies aimed at LGBTI people in Bogota, Valle del Cauca and Colombia in general. We propose an analytical exercise of these experiences, in which we have each participated at different times. These exercises have challenged us in terms of bringing proposals from social movements and academia—such as black feminism and feminisms of color, among other actors—to the realm of the state. Our participation in the formation of these policies, and in writing this article, let us seek strategies that allow for movements among different political arenas and discursive practices, illuminating porosities in and linkages among different scenarios: the state, academia and social movements.

  1. Power flow analysis for DC voltage droop controlled DC microgrids

    DEFF Research Database (Denmark)

    Li, Chendan; Chaudhary, Sanjay; Dragicevic, Tomislav

    2014-01-01

    This paper proposes a new algorithm for power flow analysis in droop controlled DC microgrids. By considering the droop control in the power flow analysis for the DC microgrid, when compared with traditional methods, more accurate analysis results can be obtained. The algorithm verification...

  2. SCM Handbooks for dc-to-dc Converters

    Science.gov (United States)

    Lee, F.; Mohmoud, M.; Yu, Y.

    1984-01-01

    Two documents aid in design of control modules for dc-to-dc converters. Features of SCM include: Adaptive stability, power component stress limiting, implementation of various control laws, unified design approach. Analysis and quidelines contained in handbooks enable engineer to design SCM circuit and confidently predict resulting overall performance.

  3. Sheppard-Taylor Isolated High Boost DC-DC Converter

    DEFF Research Database (Denmark)

    Chub, Andrii; Siwakoti, Yam Prasad; Vinnikov, Dmitri

    2017-01-01

    This paper presents a new galvanically isolated step-up dc-dc converter intended for low-power but high step-up applications. The proposed converter is capable of regulating output voltage within a wide range of the input voltage or load variations. In contrast to competitors, the converter can b...

  4. Very High Frequency Half Bridge DC/DC Converter

    DEFF Research Database (Denmark)

    Madsen, Mickey Pierre; Knott, Arnold; Andersen, Michael A. E.

    2014-01-01

    This paper presents the first, off chip, class DE (resonant half bridge) converter working in the Very High Frequency (VHF) range. The benefits of using half bridge circuits both in the inverter and rectifier part of a VHF resonant dc/dc converter are analyzed and design equations for all...

  5. Non - Vegetated Standard Bioretention Structure Hydrodynamic Soil Characterization For Ponding - Layer Optimum Thickness Determination With A Distinctive Urban - Region Rainfall Event In Bogota

    Science.gov (United States)

    Velasco Ávila, Frank; Acero Rivero, Germán Eduardo; Angulo Jaramillo, Rafael

    2017-04-01

    Aiming to propose a system, in accordance with Best Management Practices (BMP) kind of structures, specifically a standard bioretention system in Bogota city, and in order to apply the inverse solution methodology on Hydrus - 1D, it is mandatory to determine each θ_s; θ_r; α;n and ks parameters in van Genuchten - Mualem function, without considering the hysteresis phenomenon, for a standard bioretention system composing soils, as well as required components and dimensions to implement the bioretention structure in Bogota. First, a bioretention structure general dimensioning was carried out based on current urban landscaping regulations and recommendations given by the sewage - system service provider in Bogota city. Soil composing and design were performed after information gathering and previous investigation on bioretention systems dimensioning from different sources such as manuals. To give an adequate interpretation of the vadose zone, a soil column experimental prototype was built to be able to control and measure the intervening parameters in the subsoil unidimensional flow description, such as capillary pressure, soil water saturation, inflow and outflow. Thirteen sensor - based devices were built to measure the inverse model required parameters. It is important to underline that all the designed instrumentation was based on low cost electronic development. In addition, the whole instrumentation system is controlled by an Arduino Mega PLC and was designed and built as a personal initiative by the author of this work. For signal processing and data capturing, a commercial Lab View version intuitive program was designed, to be able to create a user-friendly interface to make real-time sensor visualisation and control. Finally, all the hydrodynamic characterisation for the studied soils was made through a Hydrus-1D inverse model and laboratory experimenting and obtained results. In addition, several direct models were run in order to determinate both

  6. Control of improved full-bridge three-level DC/DC converter for wind turbines in a DC grid

    DEFF Research Database (Denmark)

    Deng, Fujin; Chen, Zhe

    2013-01-01

    This paper presents an improved full-bridge three-level (IFBTL) dc/dc converter for a wind turbine in a dc grid by inserting a passive filter into the dc/dc converter to improve the performance of the converter. The passive filter can effectively reduce the voltage stress of the medium frequency...

  7. A DC Transformer

    Science.gov (United States)

    Youngquist, Robert C.; Ihlefeld, Curtis M.; Starr, Stanley O.

    2013-01-01

    A component level dc transformer is described in which no alternating currents or voltages are present. It operates by combining features of a homopolar motor and a homopolar generator, both de devices, such that the output voltage of a de power supply can be stepped up (or down) with a corresponding step down (or up) in current. The basic theory for this device is developed, performance predictions are made, and the results from a small prototype are presented. Based on demonstrated technology in the literature, this de transformer should be scalable to low megawatt levels, but it is more suited to high current than high voltage applications. Significant development would be required before it could achieve the kilovolt levels needed for de power transmission.

  8. An improved dc SQUID

    International Nuclear Information System (INIS)

    Clarke, J.; Goubau, W.M.; Ketchen, M.B.

    1975-01-01

    Cylindrical thin film dc SQUIDS that make use of resistively shunted Nb-NbOx-Pb tunnel junctions have been constructed and tested. These junctions are very robust: the SQUIDs can be thermally cycled repeatedly and stored at room temperature indefinitely. The weak temperature dependence of the critical current allows SQUID operation at any temperature below about 6K. The resolution is typically 4x10 -5 phi 0 /√Hz above 2x10 -2 Hz; at lower frequencies the noise power spectrum is 1/f. The long-term drift is less than 2x10 -5 phi 0 /hr. The 1/f noise and drift are lower than any values reported for other types of SQUIDs. (Auth.)

  9. 78 FR 62948 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2013-10-22

    ... AGROPECUARIA DEL SUR LTDA., Bogota, Colombia; c/o INVERSIONES AGROINDUSTRIALES DEL OCCIDENTE LTDA., Bogota, Colombia; c/o AGROPECUARIA LINDARAJA S.A., Cali, Colombia; c/o INVERSIONES BRASILAR S.A., Bogota, Colombia.... 2013-24130 Filed 10-21-13; 8:45 am] BILLING CODE 4810-AL-P ...

  10. 77 FR 54948 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2012-09-06

    ...., Bogota, Colombia; c/ o INVERSIONES AGROINDUSTRIALES DEL OCCIDENTE LTDA., Bogota, Colombia; c/o CANADUZ S... COLOMBO-ANDINAS LTDA., Bogota, Colombia; c/o INVERSIONES Y CONSTRUCCIONES ABC S.A., Cali, Colombia; c/ o.... 2012-21888 Filed 9-5-12; 8:45 am] BILLING CODE 4810-AL-P ...

  11. From Colombia For You

    OpenAIRE

    Arteaga-Held, Rodolfo

    2013-01-01

    From Colombia For You es un proyecto nacido a partir de la fusión de varios proyectos existentes. La fusión de Moda Store, Creaciones Artísticas La Bonanza y Bezaleel art. Se decide seguir el esquema originalmente hecho para Moda Store en el cual se decide crear una página web y un aplicativo móvil en el que se puedan integrar los productos de cada uno de los proyectos.

  12. Colombia vista desde afuera

    Directory of Open Access Journals (Sweden)

    Boletín Cultural y Bibliográfico Banco de la República

    1984-06-01

    Full Text Available Mucha de la bibliografía sobre Colombia no se conoce en el país. Cada año se realizan centenares de trabajos acerca de diferentes aspectos de las ciencias naturales, sociales, o sobre literatura, que a la postre quedan archivadas en bibliotecas europeas o estadounidenses, como ocurre de manera específica con los trabajos presentados como tesis de grado en universidades extranjeras.

  13. Colombia: Issues for Congress

    Science.gov (United States)

    2008-09-12

    appropriations and $20 million in FMF supplemental funds that were transferred to the ACI account. CRS-30 Caribbean Sea Pacific Ocean Golfo De Panama... Golfo de Venezuela Lago de Maracaibo Aruba (Neth.) Curacao Bonaire Netherlands Antilles (Neth.) Colombia Venezuela Brazil Peru Ecuador Panama Willemstad...the ELN and the Colombian government accepted an offer from Mexican President Vicente Fox to facilitate peace negotiations. In June 2004, Mexico

  14. HEALTH PSYCHOLOGY IN COLOMBIA

    OpenAIRE

    LUIS FLÓREZ-ALARCÓN

    2006-01-01

    An historical analysis about the evolution of health psychology in Colombia is made, taking as starting point someinvestigations carried out in the field of the behavioral medicine in the decade of the 70’s, and concluding with thedescription of 25 investigation groups that right now exist in many universities of the country, which carry out researchactivities in psychology and health. It is underlined that the development of this investigation field and practice inpsychology have been bound ...

  15. Three-port DC-DC converter with new integrated transformer for DC Distribution Systems

    DEFF Research Database (Denmark)

    Ouyang, Ziwei; Andersen, Michael A. E.

    2014-01-01

    A new integrated transformer for three-port dc-dc converter is proposed to overcome the power coupling effect existed in some known multiple inputs dc-dc converters. Orthogonal primary windings arrangement and in series connection of diagonal secondary Windings enables a fully power decoupling...... between the multiple inputs while the output power is still coupled with all inputs. The energy is accordingly allowed to deliver into the output load simultaneously or at any time-multiplexing scheme. 1-kW experimental prototypes have been built to demonstrate a well-managed power flow for photovoltaic...... (PV) and battery standalone system....

  16. The performance of the DC motor by the PID controlling PWM DC-DC boost converter

    OpenAIRE

    Can, Erol; Sayan, Hasan Hüseyin

    2017-01-01

    This paper presents the PID controlling direct current (DC) to the direct current boost converter feds DC motor which has a 3.68 kW and 240 V of DC voltage input on its characteristics. What is first formed is the boost converter mathematical model at the design stage. Secondly, a mathematical model of the DC motor is created so that the boost converter with the machine can be established and modeled at the Matlab Simulink. The PID controller is considered for arranging a pulse width modulati...

  17. DC Distribution Systems and Microgrids

    DEFF Research Database (Denmark)

    Dragicevic, Tomislav; Anvari-Moghaddam, Amjad; Quintero, Juan Carlos Vasquez

    2017-01-01

    A qualitative overview of different hardware topologies and control systems for DC MGs has been presented in this chapter. Some challenges and design considerations of DC protections systems have also been discussed. Finally, applications of DC MGs in emerging smart grid applications have been su...... in different industries and gradually lead to new ways of rethinking of the future power distribution philosophies, especially with the emergence of SSTs. Research in DC systems, especially in the power electronics-based technologies will be highly attractive in the future.......A qualitative overview of different hardware topologies and control systems for DC MGs has been presented in this chapter. Some challenges and design considerations of DC protections systems have also been discussed. Finally, applications of DC MGs in emerging smart grid applications have been...... summarized. Due to its attractive characteristics in terms of compliance with modern generation, storage and electronic load technologies, high reliability and current carrying capacity, as well as simple control, DC systems are already an indispensable part of power systems. Moreover, the existing...

  18. The decision of the International Court of Justice related to preliminary exceptions in the Nicaragua v. Colombia case

    Directory of Open Access Journals (Sweden)

    Rafael Nieto Navia

    2010-05-01

    Full Text Available This article is divided into three main parts. The fi rst part presents the precedents in the case relating to delimiting the Caribbean Sea boundary between Nicaragua and Colombia. It analyzes the competence of the International Court of Justice – ICJ (the Court in accordance with Article 36 of the Statute of the Court; consequently, it studies the Declaration of the acceptance of the Competence of the Court presented by Colombia to the Permanent Court of International Justice in 1937 as well as the Bogota Pact of 1948 as to its applicability and breadth as regards the 1928 EsguerraBárcenas Treaty. The second part presents a detailed analysis of the decision of the Court on the preliminary exceptions in which it was determined that the sovereignty of the islands of San Andres, Providencia, and Santa Catalina was Colombian, that the Esguerra-Bárcenas Treaty was not treaty delimiting maritime boundaries and that it (the Court was competent to get to the foundation of the matter. The third part sets out the actions which still must be completed relative to the foundation of the case.

  19. Modular Power System Configured with Standard Product Hybrid DC-DC Converters, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — VPT proposes an innovative concept whereby complex, multiple-output, DC-DC converter systems can be configured through use of only 2 standard product hybrid DC-DC...

  20. Drugs of abuse consumption in health professionals (physicians and nurses from two outpatient services of first level attention in Bogota

    Directory of Open Access Journals (Sweden)

    Lara-Hidalgo Catalina

    2012-03-01

    Full Text Available We conducted a study to establish the prevalence of drugs of abuse consumption in physiciansand nurses in two health institutions in Bogota outpatient identify the frequency of consumption,to establish the prevalence of alcoholism using the CAGE questionnaire and explore the interestparticipate in prevention or reduction of consumption in the workplace. Materials and methods: Across-sectional study by applying an anonymous survey. Results: There were 58 questionnaires (38in physicians and 20 nurses. The substances most consumed in both groups were alcohol, cigarettesand energy drinks, followed on medical by marijuana in nursing followed by barbiturates, antidepressants,amphetamines and opiates. The prevalence of alcoholism was greater than 8% in bothgroups. 58% of physicians and 70% of nurses would participate in the design of occupational healthprograms to reduce the consumption of psychoactive substances. Conclusions: The use of drugs ofabuse is higher that found in the literature for most of the substances in the general population andis similar to the revised health personnel. It recommends the formulation and implementation ofcorporate policy within the framework of occupational health work of these institutions, aimed atreducing and preventing the consumption of psychoactive substances.

  1. Triple voltage dc-to-dc converter and method

    Science.gov (United States)

    Su, Gui-Jia

    2008-08-05

    A circuit and method of providing three dc voltage buses and transforming power between a low voltage dc converter and a high voltage dc converter, by coupling a primary dc power circuit and a secondary dc power circuit through an isolation transformer; providing the gating signals to power semiconductor switches in the primary and secondary circuits to control power flow between the primary and secondary circuits and by controlling a phase shift between the primary voltage and the secondary voltage. The primary dc power circuit and the secondary dc power circuit each further comprising at least two tank capacitances arranged in series as a tank leg, at least two resonant switching devices arranged in series with each other and arranged in parallel with the tank leg, and at least one voltage source arranged in parallel with the tank leg and the resonant switching devices, said resonant switching devices including power semiconductor switches that are operated by gating signals. Additional embodiments having a center-tapped battery on the low voltage side and a plurality of modules on both the low voltage side and the high voltage side are also disclosed for the purpose of reducing ripple current and for reducing the size of the components.

  2. Efectos de una intervención educativa en la promoción de la actividad física, otros comportamientos saludables y los conocimientos para la prevención del cáncer de pulmón en jóvenes del colegio La Merced en Bogotá D.C., Colombia

    OpenAIRE

    Alba Ramírez, Pedro Alejandro

    2016-01-01

    Introducción: El cáncer de pulmón es el tipo de cáncer más mortal a nivel mundial, al cual se atribuyen una de cada cinco muertes anualmente. El objetivo de este estudio fue determinar los efectos de una intervención educativa en la promoción de la actividad física, otros comportamientos saludables y los conocimientos para la prevención del cáncer de pulmón en jóvenes estudiantes de una institución educativa pública en Bogotá, Colombia. Métodos: Estudio experimental no controlado en 243 e...

  3. Bi-Directional DC-DC Converter for PHEV Applications

    Energy Technology Data Exchange (ETDEWEB)

    Abas Goodarzi

    2011-01-31

    Plug-In Hybrid Electric Vehicles (PHEV) require high power density energy storage system (ESS) for hybrid operation and high energy density ESS for Electric Vehicle (EV) mode range. However, ESS technologies to maximize power density and energy density simultaneously are not commercially feasible. The use of bi-directional DC-DC converter allows use of multiple energy storage, and the flexible DC-link voltages can enhance the system efficiency and reduce component sizing. This will improve fuel consumption, increase the EV mode range, reduce the total weight, reduce battery initial and life cycle cost, and provide flexibility in system design.

  4. single-phase dc phase dc-ac boost converter ac boost converter

    African Journals Online (AJOL)

    User

    supply (UPS) AC motor drives and other power sup systems, need to step-up the DC input voltage. increase the output voltage level in order requirements, DC-DC boost converter is used provide DC bus voltage for PWM inverters. Hence, conventional design always cascades DC and a separate DC-AC converter.

  5. Decentralized Interleaving of Paralleled Dc-Dc Buck Converters: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Johnson, Brian B [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Rodriguez, Miguel [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Sinha, Mohit [University of Minnesota; Dhople, Sairaj [University of Minnesota; Poon, Jason [University of California at Berkeley

    2017-09-01

    We present a decentralized control strategy that yields switch interleaving among parallel connected dc-dc buck converters without communication. The proposed method is based on the digital implementation of the dynamics of a nonlinear oscillator circuit as the controller. Each controller is fully decentralized, i.e., it only requires the locally measured output current to synthesize the pulse width modulation (PWM) carrier waveform. By virtue of the intrinsic electrical coupling between converters, the nonlinear oscillator-based controllers converge to an interleaved state with uniform phase-spacing across PWM carriers. To the knowledge of the authors, this work represents the first fully decentralized strategy for switch interleaving of paralleled dc-dc buck converters.

  6. Active pre-filters for dc/dc Boost regulators

    Directory of Open Access Journals (Sweden)

    Carlos Andrés Ramos-Paja

    2014-05-01

    Full Text Available This paper proposes an active pre-filter to mitigate the current harmonics generated by classical dc/dc Boost regulators, which generate current ripples proportional to the duty cycle. Therefore, high output voltage conditions, i.e., high voltage conversion ratios, produce high current harmonics that must be filtered to avoid damage or source losses. Traditionally, these current components are filtered using electrolytic capacitors, which introduce reliability problems because of their high failure rate. The solution introduced in this paper instead uses a dc/dc converter based on the parallel connection of the Boost canonical cells to filter the current ripples generated by the Boost regulator, improving the system reliability. This solution provides the additional benefits of improving the overall efficiency and the voltage conversion ratio. Finally, the solution is validated with simulations and experimental results.

  7. Fuzzy Control of DC-DC Converters with Input Constraint

    Directory of Open Access Journals (Sweden)

    D. Saifia

    2012-01-01

    Full Text Available This paper proposes a method for designing fuzzy control of DC-DC converters under actuator saturation. Because linear control design methods do not take into account the nonlinearity of the system, a T-S fuzzy model and a controller design approach is used. The designed control not only handles the external disturbance but also the saturation of duty cycle. The input constraint is first transformed into a symmetric saturation which is represented by a polytopic model. Stabilization conditions for the state feedback system of DC-DC converters under actuator saturation are established using the Lyapunov approach. The proposed method has been compared and verified with a simulation example.

  8. DC Microgrids—Part II

    DEFF Research Database (Denmark)

    Dragicevic, Tomislav; Lu, Xiaonan; Quintero, Juan Carlos Vasquez

    2016-01-01

    distribution applications such as traction, telecom, vehicular and distributed power systems can be classified under DC MG framework and ongoing development and expansion of the field is largely influenced by concepts used over there. This paper aims firstly to shed light on the practical design aspects of DC...... MG technology concerning typical power hardware topologies and their suitability for different emerging smart grid applications. Then, an overview of the state of the art in DC MG protection and grounding is provided. Owing to the fact that there is no zero current crossing, an arc that appears upon...

  9. Hybrid battery with bi-directional DC/DC converter

    Directory of Open Access Journals (Sweden)

    DUDRIK Jaroslav

    2010-05-01

    Full Text Available Bi-directional buck-boost DC/DC converterfor hybrid battery is described in this paper. The firstpart of the paper is aimed at concept of hybrid battery;main advance compared to conventional accumulatoris explained there. Control circuit with UC3637 andpower circuit of the converter are described in thesecond part of the paper. Experimental results frommeasuring of converter are mentioned in the last part.

  10. DC injection into low voltage AC networks

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    This report summarises the results of a study investigating the impact of levels of injected DC current injections on a low voltage AC distribution network systems in order to recommend acceptable limits of DC from microgeneration. Relevant literature is reviewed, and the impact of DC levels in distribution transformers, transformer modelling, and instrumental transformers are discussed. The impact of DC in residual current devices (RCD) and in domestic electricity watt hour meters is examined along with DC enhanced corrosion, corrosion failure, and the measurement of DC current injection. Sources of DC injection outlined include DC from computer power supplies, network faults, geomagnetic phenomena, lighting circuits/dimmers, and embedded generators.

  11. Serpientes de colombia

    OpenAIRE

    M., Rodrigo Ángel

    2013-01-01

    En este libro es una guía práctica sobre las serpientes de Colombia en cuanto a su clasificación y tratamiento del envenenamiento causado por sus mordeduras. Contiene los siguientes capítulos: 1. Características generales, 2. Serpiente Colombianas, 3. Aparato venenoso, 4. Clasificación fisiopatología de los efectos del veneno, 5. Mordedura por serpientes venenosas en Antioquía, listas de nombres populares y científicos, la bibliografía. Esta es una introducción a esta práctica guí...

  12. Isolated step-down DC -DC converter for electric vehicles

    Science.gov (United States)

    Kukovinets, O. V.; Sidorov, K. M.; Yutt, V. E.

    2018-02-01

    Modern motor-vehicle industrial sector is moving rapidly now towards the electricity-driving cars production, improving their range and efficiency of components, and in particular the step-down DC/DC converter to supply the onboard circuit 12/24V of electric vehicle from the high-voltage battery. The purpose of this article - to identify the best circuitry topology to design an advanced step-down DC/DC converters with the smallest mass, volume, highest efficiency and power. And this will have a positive effect on driving distance of electric vehicle (EV). On the basis of computational research of existing and implemented circuit topologies of step-down DC/DC converters (serial resonant converter, full bridge with phase-shifting converter, LLC resonant converter) a comprehensive analysis was carried out on the following characteristics: specific volume, specific weight, power, efficiency. The data obtained was the basis for the best technical option - LLC resonant converter. The results can serve as a guide material in the process of components design of the traction equipment for electric vehicles, providing for the best technical solutions in the design and manufacturing of converting equipment, self-contained power supply systems and advanced driver assistance systems.

  13. Vasculitis renal en Colombia / Renal vasculitis in Colombia

    OpenAIRE

    Ramirez Rubio , Fabian Alberto

    2010-01-01

    Las vasculitis se caracterizan por la inflamación de las paredes vasculares y el riñón puede estar afectado de varias formas. La información epidemiológica en Colombia de la vasculitis renal es escasa. Objetivos: Identificar las causas de vasculitis renal en pacientes Colombianos. Métodos: Varios centros de Reumatología en Colombia, liderado por la Universidad Nacional de Colombia, recolectaron desde el año 2000, pacientes con diagnóstico de vasculitis primaria. Para el diagnóstico, cada c...

  14. [Assessment of the spatial accessibility to the rabies vaccination campaign in Bogotá, Colombia].

    Science.gov (United States)

    Monsalve, Stefany; Rucinque, Santiago; Polo, Luis; Polo, Gina

    2016-09-01

    The access of Bogota's population to health services is unknown, and this hinders the planning of health prevention strategies. Objective: To estimate the spatial accessibility to the vaccination sites of the 2011 campaign against rabies in Bogotá, Colombia, and to compare its efficiency with two other spatial coverage methodologies. Materials and methods: Spatial accessibility was determined using the two-step floating catchment area model (2SFCA). We calculated spatial coverage by establishing circular buffer zones using Euclidean distances, and irregular zones around the vaccination sites using Dijkstra's algorithm on the city's street network. Results: The spatial coverage of the program was 78.4% using the circular buffer zones, and 60.2% using Dijsktra's algorithm. The spatial accessibility analysis revealed that the periphery of the city had the lowest accessibility to the program. This peripheral area is a very critical zone because it is an urban-rural interface, which represents a risk for the re-introduction of rabies in the city. Conclusions: The 2SFCA spatial accessibility model is an effective tool to identify isolated areas, evaluate health services use more precisely, and provide basis for their strategic location. We concluded that this approach had the potential to improve resource efficiency when planning rabies control programs in urban environments such as Bogotá. The findings emphasize the need for surveillance and intervention in isolated areas with low access to services.

  15. Una Colombia imaginada

    Directory of Open Access Journals (Sweden)

    Miguel A. Ramiro Avilés

    2014-01-01

    Full Text Available José Antonio Osorio Lizarazo, José Félix Fuenmayor y Manuel Francisco Sliger Vergara escribieron, respectivamente, Barranquilla 2132, Una triste aventura de 14 sabios y Viajes interplanetarios en Zepelines que tendrán lugar el año 2009. Se trata de tres novelas de ciencia ficción que fueron publicadas en Colombia en la década de 1930. En estas obras se perfila una Colombia imaginada, muchas veces deseada y, por suerte o desgracia, nunca alcanzada. El objetivo de este texto es presentar las propuestas de reforma política anunciadas por estos tres autores en sus obras de ciencia ficción, centrando la atención en la obra de José Antonio Osorio Lizarazo por ser la más compleja y elaborada de las tres, así como por estar directamente ligada al pensamiento político de Jorge Eliécer Gaitán.

  16. A propósito de la introducción de aislamientos de Phytophthora infestans para investigación en Colombia Sorne thoughts concerning the import of the mating type A2 of Phytophthora infestans into Colombia

    Directory of Open Access Journals (Sweden)

    García Dominguez Celsa

    1997-12-01

    Full Text Available Phitophthora infestans es un patógeno heterotálico que requiere dos tipos de apareamiento, A 1 y A2, para que haya reproducción sexual. El tipo A 1 se encontraba distribuido en todas las zonas productoras de papa del mundo; pero, al final de los años 1970s el tipo A2 salió de México (su centro de origen, hacia Europa y al resto del mundo. Como en Colombia no se conocía la composición de las poblaciones de este patógeno, dos grupos de investigación de la Universidad Nacional iniciaron su estudio. El grupo de la Sede Bogotá optó por la importación del tipo A2 para realizar los trabajos de investigación. El presente comunicado es una reflexión sobre los riesgos y los cuidados que se deben tener al importar un patógeno que no está
    presente en el país.Phytophthora infestans is an heterothallic pathogen that requires the presence oftwo mating types, A1 and A2, for sexual reproduction. The A1 type had a worldwide distribution, but at the end of the 70s the A2 migrated from Mexico (the center of origin to Europe and from there to the rest of the world. Since in Colombia there was no information conceming the composition of the population of this pathogen, two research groups from the Universidad Nacional de Colombia initiated studies to determine the composition of the population of this pathogen. The group from Bogota imported the A2 type. The present work contains some thoughts on the risk involved when importing alien and exotic pathogens.

  17. Improved Control Strategy for T-type Isolated DC/DC Converters

    DEFF Research Database (Denmark)

    Liu, Dong; Deng, Fujin; Wang, Yanbo

    2017-01-01

    T-type isolated DC/DC converters have recently attracted attention due to their numerous advantages, including few components, low cost, and symmetrical operation of transformers. This study proposes an improved control strategy for increasing the efficiency of T-type isolated DC/DC converters....../DC converters. The operation principles and performances of T-type isolated DC/DC converters under the proposed control strategy are analyzed in detail and verified through the simulation and experimental results....

  18. SMALL-SIGNAL ANALYZING OF SEPARATELY EXCITED DC MOTOR FED DC - DC CHOPPER

    Directory of Open Access Journals (Sweden)

    İSMAİL COŞKUN

    1999-12-01

    Full Text Available Choppers are widely used in order to get smooth speed characteristics of DC motors. If the load or input voltage is changed, a feedback control technique is used to get the constant speed. To design the proper feedback control, the transfer function of the chopper-motor combination should be kno\\vn. ln this study, the effort was given to obtain the general black diagram, inciurling the field current and aı1na ture current of chopper-fed DC motor. It can be seen from the black diagram that the chopper circuit modifies the transfer function of the DC motor. DC-DC DARBEL E YİCİ iLE YABANCI UYARTIMLI DC KÜÇÜK SİNY AL ANALİZİ ÖZET BESLENEN MOT O RUN DC motorlardan düzgün bir hız karakteristiği elde etmek için darbeleyiciler çok kullamlır. Eğer yük ya da giriş gerilimi de ği şirse, sabit hız elde etmek için geribeslemeli kontrol tekniği kuJlanılır. Uygun bir geribesleme kontrolu tasarlamak iç� darbeliyici-motor kombinasy onunun transfer fonksiyonu bilinmelidir. -Bu çalışma da, darbeleyici ile beslenen DC motorun alan akımı ve endüvi akımını da kapsayan genel blok diyağraınını elde etıııek için çaba gösterilmiştir. Blok diyagramından görülebilec eği gibi, darbeleyici devresi DC motorun tra nsfer fonksiyonunu değiştirmektedir. I. INTRODUCTI ON Choppers are widely used for speed control of DC separately excited motors as they offer high efficiency, quick response, wide speed control range and regeneration down to very low speeds [ 1] . All chopper circuits can be classified into two groups. (a Load ind ependent choppers� in which the output voltage waveform is either a square wave or can be approximated by a square \\vave. (b Load dependent choppers, in which charging of the commutating capacitor is govemed by load current. In such cases, the output voltage wavefoım is neither a square wave nor can be approximated by a square wave. Various methods of analyzing of DC motors fed by a chopper with

  19. PLAN COLOMBIA: Some Differing Perspectives

    National Research Council Canada - National Science Library

    Marcella, Gabriel

    2001-01-01

    This monograph, with an introduction by Dr. Gabriel Marcella, includes four short, but interesting and important papers presented at a conference on Plan Colombia, sponsored by the Strategic Studies Institute of the U.S...

  20. Gravity Data For Colombia 1997

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The gravity station data (9,050 records), were observed and processed by the Instituto Geografico Agustin Codazzi(IGAC), in Colombia from 1958 to 1996. This data...

  1. Catalogue of Tephritidae of Colombia

    Science.gov (United States)

    The present Catalogue includes 93 species and 23 genera of Tephritidae that have been recorded in Colombia. Four subfamilies (Blepharoneurinae, Dacinae, Trypetinae and Tephritinae), and eight tribes (Acrotaeniini, Carpomyini, Dacini, Eutretini, Myopitini, Noeetini, Tephritini, and Toxotrypanini) are...

  2. Sistem Kontrol Torsi pada Motor DC

    OpenAIRE

    Wahid Ibrahim, Arifin; Wahyu Widodo, Triyogatama; Wahyu Supardi, Tri

    2016-01-01

    The use of a DC motor in the industrialized world is very important. Speed of DC motor and torque of DC motor greatly affects quality and quantity of product. Therefore, we need control system of a DC motor that can be set speed and torque. The number of industry players complained about damage to the DC motor because transported load torque of motor exceeds capabilities of torque of DC motor. Based on these problem, we should make torque control system in DC motor.Torque control system made ...

  3. Decentralization and Bailouts in Colombia

    OpenAIRE

    Juan José Echavarría; Carolina Rentería; Roberto Steiner

    2002-01-01

    This paper examines the decentralization process in Colombia, particularly as it relates to reforms embodied in the 1991 Constitution, and the bailouts of territorial entities that have occurred in subsequent years as a result of perverse incentive structures. The paper provides a summary of the basic features of the decentralization process in Colombia, including an analysis of revenue and expenditure assignments, the intergovernmental transfer system and recent developments in terms of terr...

  4. Control and dynamic analysis of a parallel-connected single active bridge DC-DC converter for DC-grid wind farm application

    DEFF Research Database (Denmark)

    Park, Kiwoo; Chen, Zhe

    2015-01-01

    This study presents a control strategy and its dynamic analysis of a high-power dc-dc converter, which is constructed with the parallel-connected single active bridge (SAB) dc-dc converters for dc-grid wind farm applications. The structural and operational characteristics of the SAB dc-dc converter...

  5. Pulsewidth modulated DC-to-DC power conversion circuits, dynamics, and control designs

    CERN Document Server

    Choi, Byungcho

    2013-01-01

    This is the definitive reference for anyone involved in pulsewidth modulated DC-to-DC power conversion Pulsewidth Modulated DC-to-DC Power Conversion: Circuits, Dynamics, and Control Designs provides engineers, researchers, and students in the power electronics field with comprehensive and complete guidance to understanding pulsewidth modulated (PWM) DC-to-DC power converters. Presented in three parts, the book addresses the circuitry and operation of PWM DC-to-DC converters and their dynamic characteristics, along with in-depth discussions of control design of PWM DC-to

  6. LAS MIGRACIONES INTERNACIONALES EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Maguemati Wabgou

    2012-01-01

    Full Text Available El artículo expone los resultados de una investigación sobre los flujos migratorios internacionales que han estado llegando a Colombia desde el siglo XVI hasta la actualidad. La metodología investigativa se fundamenta en la recolección y el análisis de datos derivados de investigaciones anteriores. Los resultados son significativos en lamedida que presentan el estado de las migraciones en Colombia entre los siglos XVI y XIX y desde la primera mitad del siglo XX hasta la actualidad. Por un lado, engloban a la inmigración británica, jamaiquina y africana en las islas de San Andrés y Providencia; junto con la inmigración árabe, judía, alemana, francesa, italiana y gitana en Colombia continental. Por otro, aluden a las migraciones japonesas, suramericanas, junto con los crecientes asentamientos de migrantes norteamericanos, europeos y las nuevas oleadas de migraciones asiáticas y africanas en Colombia. Todo ello lleva a aprehender la envergadura del papel jugado por Colombia como un país de destino de las migraciones internacionales, lo que contrasta con la imagen más conocida de Colombia como un país expulsor de emigrantes.

  7. LAS MIGRACIONES INTERNACIONALES EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Maguemati Wabgou

    2011-10-01

    Full Text Available El artículo expone los resultados de una investigación sobre los flujos migratorios internacionales que han estado llegando a Colombia desde el siglo XVI hasta la actualidad. La metodología investigativa se fundamenta en la recolección y el análisis de datos derivados de investigaciones anteriores. Los resultados son significativos en la medida que presentan el estado de las migraciones en Colombia entre los siglos XVI y XIX y desde la primera mitad del siglo XX hasta la actualidad. Por un lado, engloban a la inmigración británica, jamaiquina y africana en las islas de San Andrés y Providencia; junto con la inmigración árabe, judía, alemana, francesa, italiana y gitana en Colombia continental. Por otro, aluden a las migraciones japonesas, suramericanas, junto con los crecientes asentamientos de inmigrantes norteamericanos, europeos y las nuevas oleadas de migraciones asiáticas y africanas en Colombia. Todo ello lleva a aprehender la envergadura del papel jugado por Colombia como un país de destino de las migraciones internacionales, lo que contrasta con la imagen más conocida de Colombia como un país expulsor de emigrantes.

  8. Epidemiology of rosacea in Colombia.

    Science.gov (United States)

    Rueda, Lili J; Motta, Adriana; Pabón, Juan G; Barona, Maria I; Meléndez, Esperanza; Orozco, Beatriz; Rojas, Ricardo F

    2017-05-01

    Prevalence of rosacea has been estimated around the world in the range of 0-22%. In Colombia, the prevalence of rosacea remains unknown. The aim of this study was to determine the prevalence of rosacea and the frequencies of its subtypes in Colombia. This cross-sectional, multicenter study was conducted in six outpatient dermatology clinics across Colombia. A total of 33 dermatologists conducted a comprehensive medical history and physical examination for all rosacea patients seen at their offices over the course of 2 months. All patients who accepted to participate were encouraged to answer a survey about the history of their illness. Of 10,204 outpatients evaluated for rosacea between July and August 2014, 291 rosacea patients were included in this study. The prevalence of rosacea subtypes in this cohort was: 45.3% erythematotelangiectatic (ETR) (n = 132), 48.7% papulopustular (PPR) (n = 142), 4.8% phymatous (n = 14), and 1% ocular (n = 3). Overall, the prevalence in Colombia was 2.85%. Our data represent an important first step to understanding the current state of rosacea in Colombia. The prevalence of rosacea in Colombia is the highest in Latin America among a few reports published, which might be explained by geographic features. However, contrary to our expectations, the prevalence is lower than that in some European countries. We postulate that this finding may be due to methodological differences. © 2017 The International Society of Dermatology.

  9. Marine biodiversity in Colombia

    International Nuclear Information System (INIS)

    Diaz, Juan Manuel

    2002-01-01

    One decade ago, the seas and oceans were considered biologically less diverse that the terrestrial environment. Now it is known that it is on the contrary; 33 of the 34 categories of animals (phylum), they are represented in the sea, compared with those solely 15 that exist in earth. The investigation about the diversity of life in the sea has been relatively scorned, but there are big benefits that we can wait if this is protected. The captures of fish depend on it; the species captured by the fisheries are sustained of the biodiversity of their trophic chains and habitats. The marine species are probably the biggest reservoir of chemical substances that can be used in pharmaceutical products. The genetic material of some species can be useful in biotechnical applications. The paper treats topics like the current state of the knowledge in marine biodiversity and it is done a diagnostic of the marine biodiversity in Colombia

  10. Las Serpientes en Colombia

    Directory of Open Access Journals (Sweden)

    Daniel H.

    1949-12-01

    Full Text Available El estudio de las serpientes en Colombia no deja de tener su particular interés; existe una inmensa variedad de especies que se escalonan desde los valles ardientes hasta alturas relativamente considerables; en estos últimos puntos disminuye notablemente la variedad de formas y de modo especial las especies provistas de veneno. Hacer una distinción entre las especies venenosas y las inofensivas, resulta un tanto difícil; en algunos textos se dan unas cuántas reglas, pero la mayor parte de ellas sólo tienen aplicación con especies exóticas ya que la mayor parte de esas distinciones se han tomado de obras que hacen referencia a la fauna europea.

  11. Derecho Electoral en Colombia

    Directory of Open Access Journals (Sweden)

    Carlos Ariel Sanchez-Torres

    2010-03-01

    Full Text Available El artículo quiere demostrar que la afirmación y profundización de las normas electorales, en orden a la democracia y su progreso, han constituido en Colombia una forma institucional de cambio.  Si bien es cierto que no puede desconocerse el paréntesis del Frente Nacional que limitó el libre juego de las fuentes políticas, la legislación en temas como financiación política, publicidad y encuestas de opinión actualmente vigentes, son vitales para  que la democracia  y las normas electorales sean el camino Institucional  del cambio.

  12. Mucormicosis (ficomicosis en Colombia

    Directory of Open Access Journals (Sweden)

    Carlos E. Peña

    1965-10-01

    Full Text Available Se presentan dos casos de mucormicosis (ficomicosis, entidad que ha sido muy raramente encontrada en Colombia. El primer caso se refiere a un prematuro con deshidratación consecutiva a vómito y diarrea. A la autopsia se encontró una mucormicosis del intestino delgado con necrosis del mismo e invasión al bazo, a la vez que una candidiasis esofágica. El segundo caso es el de un niño de 5 meses de edad, con diarreas, vómito, acidosis y signos de trombosis del seno cavernoso derecho y de meningitis. La autopsia reveló una mucormicosis ocular y meningo-encefálica acompañada de trombosis de la arteria cerebral media derecha y del seno cavernoso del mismo lado.

  13. Sertula Florae Colombiae, II

    Directory of Open Access Journals (Sweden)

    Uribe Uribe Lorenzo

    1955-08-01

    Full Text Available En el presente artículo el autor registra como nuevas para Colombia varias especies pertenecientes a las Familias botánicas Aristolochiaceae, Passifloraceae y Solanaceae; provee de una diagnosis latina a Aristolochia argyroneura con el fin de revalidar ese binomio empleado irreglamentariamente desde hace medio siglo por carecer de la debida descripción; y discute brevemente el problema suscitado en torno al género Dilkea (de las Pasifloráceas, al cual se han atribuido varias especies por algunos botánicos, mientras otros sospechan que se trata de simples formas de una misma entidad específica por lo cual el genero debe ser considerado como monotípico.

  14. A SOFT SWITCHED INTERLEAVED HIGH GAIN DC-DC CONVERTER

    Directory of Open Access Journals (Sweden)

    SHESHIDHAR REDDY ADDULA

    2017-09-01

    Full Text Available In this paper, a novel soft-switched interleaved DC-DC converter which provides a high voltage gain of 12 is proposed. Voltage gain of the basic interleaved boost converter is extended by using diode-capacitor multiplier (DCM cells. The switches are operated at a nominal duty ratio of 0.5. The voltage stress on the power switches and diodes is only a fraction of the output voltage. To enhance the operating power conversion efficiency, the switches are turned ON at zero voltage condition. Experimental results of 18-216V, 100W prototype converter validate the operating principle and the advantageous features of the presented converter.

  15. Light-weight DC to very high voltage DC converter

    Science.gov (United States)

    Druce, R.L.; Kirbie, H.C.; Newton, M.A.

    1998-06-30

    A DC-DC converter capable of generating outputs of 100 KV without a transformer comprises a silicon opening switch (SOS) diode connected to allow a charging current from a capacitor to flow into an inductor. When a specified amount of charge has flowed through the SOS diode, it opens up abruptly; and the consequential collapsing field of the inductor causes a voltage and current reversal that is steered into a load capacitor by an output diode. A switch across the series combination of the capacitor, inductor, and SOS diode closes to periodically reset the SOS diode by inducing a forward-biased current. 1 fig.

  16. Pulse-width modulated DC-DC power converters

    CERN Document Server

    Kazimierczuk, Marian K

    2008-01-01

    This book studies switch-mode power supplies (SMPS) in great detail. This type of converter changes an unregulated DC voltage into a high-frequency pulse-width modulated (PWM) voltage controlled by varying the duty cycle, then changes the PWM AC voltage to a regulated DC voltage at a high efficiency by rectification and filtering. Used to supply electronic circuits, this converter saves energy and space in the overall system. With concept-orientated explanations, this book offers state-of-the-art SMPS technology and promotes an understanding of the principle operations of PWM converters,

  17. Low dose failures of hardened DC-DC power converters

    Science.gov (United States)

    Lehman, J.; Yui, C.; Rax, B. G.; Miyahira, T. F.; Weideman, M.; Schrick, P.; Swift, G. M.; Johnston, A. H.

    2002-01-01

    Box-level total dose testing of the FOG (Fiber Optic Gyro) by IXSEA at ESA's GammabeamFacility were abruptly terminated at 8krad (Si) due to catastrophic failure (complete shutdown). This was unexpected because all components within the gyro were supposedly radiation tolerant. Further testing showed that the components responsible for the failure were two DC-DC converters, manufactured by Interpoint, that stopped regulating shortly before shutdown. This paper summarizes diagnostic test results for the converters to determine the underlying cause of the unexpected failure at low levels of radiation.

  18. DC grid for home applications

    Science.gov (United States)

    Elangovan, D.; Archana, R.; Jayadeep, V. J.; Nithin, M.; Arunkumar, G.

    2017-11-01

    More than fifty percent Indian population do not have access to electricity in daily lives. The distance between the power generating stations and the distribution centers forms one of the main reasons for lack of electrification in rural and remote areas. Here lies the importance of decentralization of power generation through renewable energy resources. In the present world, electricity is predominantly powered by alternating current, but most day to day devices like LED lamps, computers and electrical vehicles, all run on DC power. By directly supplying DC to these loads, the number of power conversion stages was reduced, and overall system efficiency increases. Replacing existing AC network with DC is a humongous task, but with power electronic techniques, this project intends to implement DC grid at a household level in remote and rural areas. Proposed work was designed and simulated successfully for various loads amounting to 250 W through appropriate power electronic convertors. Maximum utilization of the renewable sources for domestic and commercial application was achieved with the proposed DC topology.

  19. Economic geology of the Zipaquira quadrangle and adjoining area, Department of Cundinamarca, Colombia

    Science.gov (United States)

    McLaughlin, Donald H.; Arce Herrera, Marino

    1970-01-01

    At least four evaporite sequences are interbedded with Cretaceous strata in the Bogotga area of the Cordillera Oriental of Colombia. The easternmost and oldest evaporite interval is of probable Berriasian-Valanglnian age; the next oldest is of probable late Barremian-early Aptian age, and is followed by a possible late Aptian sequence. The westernmost and best known sequence is Turonian-early Coniacian in age, in the Sabana de Bogota. This youngest sequence contains the thickest known salt deposits and is probably the most widespread geographically. Three gypsum deposits of probable Barremian-Valanginian age are in the eastern part of the area under investigation. These deposits may have been leached from former salt accumulations. No other evaporites are exposed, but numerous brine springs are known, That the sources of these brines are neither deep not distant is suggested by the generally high concentrations, of the brines, the local presence of rute (leached salt residue), and the commonly significant amounts of H2S gas emitted at these springs. The rock salt exposed in three accessible mines commonly has a characteristic lamination caused by alternating layers of relatively pure halite and very argillaceous halite. Ubiquitously scattered throughout all salt deposits are small clasts of black, commonly pyritic, marly claystone. This lithology is also present as large claystone bodies conformably interbedded in the salt strata. Anhydrite is rare and is apparently more abundant at the Zipaquira mine that at the Nemocon and Upin mine. Paleontologic evidence in the Sabana de Bogota demonstrates that the salt-claystone series, hematite impregnated strata, and carbonaceous to locally coaly claystone are coeval. The salt-claystone facies may have been deposited in shallow evaporite pans that were separated within the overall evaporite interval by barriers on which the locally hematitic strata were deposited. The carbonaceous facies may also have formed in barrier

  20. Linking DC together with TRSL

    DEFF Research Database (Denmark)

    Haxthausen, Anne Elisabeth; Yong, X.

    2000-01-01

    Duration Calculus (DC) is an interval-based real-time logic, which can be used in capturing and eliciting users' real-time requirements. The Timed RAISE Specification Language (TRSL) is an extension of the RAISE Specification Language with real-time features. This paper links DC and TRSL together...... in a method for real-time developments. An operational semantics with behavior is specified for TRSL. It is defined what its means for a TRSL process to satisfy a DC requirement, and a method for verifying whether the satisfaction relation holds or not is provided. Our contribution also demonstrates a general...... approach for linking state-based real-time logics together with event-based, timed process algebra languages....

  1. Land Reform and Conflict Resolution in Colombia

    National Research Council Canada - National Science Library

    Nieswiadomy, Mark

    2003-01-01

    One of the leading arguments explaining the current rural conflict in Colombia is that it stems from deeply rooted peasant grievances over lack of land, As is true in much of Latin America, Colombia...

  2. United States Strategy in Colombia: New Opportunities

    National Research Council Canada - National Science Library

    Roberts, Lee C

    2003-01-01

    .... Despite decades of U.S. support to the Government of Colombia, the troika of guerrilla insurgency, civil disorder by paramilitaries, and illegal drug activities has brought Colombia close to becoming a failed State. U.S...

  3. Foundations of DC plasma sources

    Science.gov (United States)

    Tomas Gudmundsson, Jon; Hecimovic, Ante

    2017-12-01

    A typical dc discharge is configured with the negative cathode at one end and a positive anode at the other end, separated by a gas filled gap, placed inside a long glass cylinder. A few hundred volts between the cathode and anode is required to maintain the discharge. The type of discharge that is formed between the two electrodes depends upon the pressure of the working gas, the nature of the working gas, the applied voltage and the geometry of the discharge. We discuss the current–voltage characteristics of the discharge as well as the distinct structure that develops in the glow discharge region. The dc glow discharge appears in the discharge current range from μA to mA at 0.5–300 Pa pressure. We discuss the various phenomena observed in the dc glow discharge, including the cathode region, the positive column, and striations. The dc glow discharge is maintained by the emission of secondary electrons from the cathode target due to the bombardment of ions. For decades, the dc glow discharge has been used as a sputter source. Then it is often operated as an obstructed abnormal glow discharge and the required applied voltage is in the range 2–5 kV. Typically, the cathode target (the material to be deposited) is connected to a negative voltage supply (dc or rf) and the substrate holder faces the target. The relatively high operating pressure, in the range from 2 to 4 Pa, high applied voltages, and the necessity to have a conductive target limit the application of dc glow discharge as a sputter source. In order to lower the discharge voltage and expand the operation pressure range, the lifetime of the electrons in target vicinity is increased through applying magnetic field, by adding permanent magnets behind the cathode target. This arrangement is coined the magnetron sputtering discharge. The various configurations of the magnetron sputtering discharge and its applications are described. Furthermore, the use of dc discharges for chemical analysis, the

  4. Switching coordination of distributed dc-dc converters for highly efficient photovoltaic power plants

    Science.gov (United States)

    Agamy, Mohammed; Elasser, Ahmed; Sabate, Juan Antonio; Galbraith, Anthony William; Harfman Todorovic, Maja

    2014-09-09

    A distributed photovoltaic (PV) power plant includes a plurality of distributed dc-dc converters. The dc-dc converters are configured to switch in coordination with one another such that at least one dc-dc converter transfers power to a common dc-bus based upon the total system power available from one or more corresponding strings of PV modules. Due to the coordinated switching of the dc-dc converters, each dc-dc converter transferring power to the common dc-bus continues to operate within its optimal efficiency range as well as to optimize the maximum power point tracking in order to increase the energy yield of the PV power plant.

  5. Application of Distributed DC/DC Electronics in Photovoltaic Systems

    Science.gov (United States)

    Kabala, Michael

    In a typical residential, commercial or utility grade photovoltaic (PV) system, PV modules are connected in series and in parallel to form an array that is connected to a standard DC/AC inverter, which is then connected directly to the grid. This type of standard installation; however, does very little to maximize the energy output of the solar array if certain conditions exist. These conditions could include age, temperature, irradiance and other factors that can cause mismatch between PV modules in an array that severely cripple the output power of the system. Since PV modules are typically connected in series to form a string, the output of the entire string is limited by the efficiency of the weakest module. With PV module efficiencies already relatively low, it is critical to extract the maximum power out of each module in order to make solar energy an economically viable competitor to oil and gas. Module level DC/DC electronics with maximum power point (MPP) tracking solves this issue by decoupling each module from the string in order for the module to operate independently of the geometry and complexity of the surrounding system. This allows each PV module to work at its maximum power point by transferring the maximum power the module is able to deliver directly to the load by either boosting (stepping up) the voltage or bucking (stepping down) the voltage. The goal of this thesis is to discuss the development of a per-module DC/DC converter in order to maximize the energy output of a PV module and reduce the overall cost of the system by increasing the energy harvest.

  6. Street youth in Colombia: lifestyle, attitudes and knowledge.

    Science.gov (United States)

    Ruiz, J

    1994-01-01

    Gamines in Bogota, Colombia, are youths who live on the streets sometimes keeping loose family ties. They belong to informal gangs, use drugs, and survive by doing itinerant informal sector work, begging, and stealing. The New Life Program (NLP) of the Corporacion SOS Aldea de Ninos worked with three other agencies to investigate the lifestyle, attitudes, and knowledge of gamines about HIV/STDs for the purpose of designing AIDS/STD educational activities for the population. Focus group discussions and educational activities were conducted with 12 girls and 18 boys aged 14-25 years who had started living in NLP's shelter while working on the streets. Participants had spent an average of 7 years on the street typically from age 10. Concentrating primarily upon daily survival, these youths act on the basis of intuition and emotions. Verbal communication is essential to gain and maintain their trust. Although their sexual lives are influenced by the family of origin, institutions in which they have resided, and peers, and their daily lifestyles have much influence. Steady partners are sought for affection and romance, while sexual intercourse is had for pleasure and to satisfy biological need. Some homosexuality and prostitution are tolerated. Gangs also gang-rape and expel members thought to be traitors. The idea of birth control exists among the girls, but the boys overwhelmingly reject condom use. The boys got information on sex from prostitutes, erotic magazines, and adults, but girls rarely talk about sex. Many have had STDs and are generally aware about AIDS, but misinformed about transmission modes, symptoms, and treatment. The boys were especially negative about meeting a person with AIDS. Overall, the youths did not perceive themselves as being at risk for HIV infection. Participants also strongly distrusted the health system because many had been turned away for being dirty or received only callous treatment. The author concludes that we must acknowledge that

  7. The Colombia Seismological Network

    Science.gov (United States)

    Blanco Chia, J. F.; Poveda, E.; Pedraza, P.

    2013-05-01

    The latest seismological equipment and data processing instrumentation installed at the Colombia Seismological Network (RSNC) are described. System configuration, network operation, and data management are discussed. The data quality and the new seismological products are analyzed. The main purpose of the network is to monitor local seismicity with a special emphasis on seismic activity surrounding the Colombian Pacific and Caribbean oceans, for early warning in case a Tsunami is produced by an earthquake. The Colombian territory is located at the South America northwestern corner, here three tectonic plates converge: Nazca, Caribbean and the South American. The dynamics of these plates, when resulting in earthquakes, is continuously monitored by the network. In 2012, the RSNC registered in 2012 an average of 67 events per day; from this number, a mean of 36 earthquakes were possible to be located well. In 2010 the network was also able to register an average of 67 events, but it was only possible to locate a mean of 28 earthquakes daily. This difference is due to the expansion of the network. The network is made up of 84 stations equipped with different kind of broadband 40s, 120s seismometers, accelerometers and short period 1s sensors. The signal is transmitted continuously in real-time to the Central Recording Center located at Bogotá, using satellite, telemetry, and Internet. Moreover, there are some other stations which are required to collect the information in situ. Data is recorded and processed digitally using two different systems, EARTHWORM and SEISAN, which are able to process and share the information between them. The RSNC has designed and implemented a web system to share the seismological data. This innovative system uses tools like Java Script, Oracle and programming languages like PHP to allow the users to access the seismicity registered by the network almost in real time as well as to download the waveform and technical details. The coverage

  8. Voltage Weak DC Distribution Grids

    NARCIS (Netherlands)

    Hailu, T.G.; Mackay, L.J.; Ramirez Elizondo, L.M.; Ferreira, J.A.

    2017-01-01

    This paper describes the behavior of voltage weak DC distribution systems. These systems have relatively small system capacitance. The size of system capacitance, which stores energy, has a considerable effect on the value of fault currents, control complexity, and system reliability. A number of

  9. Experiments with a DC Motor

    Science.gov (United States)

    Kraftmakher, Yaakov

    2010-01-01

    Experiments with an electric motor provide good opportunity to demonstrate some basic laws of electricity and magnetism. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the rotation velocity. The tight relationship between the…

  10. Electricity-AC versus DC

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 2; Issue 10. Electricity - AC versus DC. D P Sen Gupta. General Article Volume 2 Issue 10 October 1997 pp 46-53. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/002/10/0046-0053. Author Affiliations.

  11. Burden of epilepsy in Colombia.

    Science.gov (United States)

    Méndez-Ayala, Alejandro; Nariño, Daniel; Rosselli, Diego

    2015-01-01

    Epilepsy lays an important burden on healthcare systems and society in general. Disability adjusted life years (DALYs) have been developed to compare the burden of this disease both between conditions and between geographical boundaries. With improving data on disease incidence and prevalence in Colombia, we can refine our DALYs-based estimates. Using different strategies, including the official healthcare provision database and death certificates, as well as extrapolation from published neuroepidemiologic studies, we estimated the incidence and prevalence by age groups, disease duration and attributable mortality. With this information we calculated DALYs for the year 2012. Overall, it was found that epilepsy was responsible for 0.88% of all deaths in Colombia. A total of 5.25 DALYs per 1,000 person-years are lost due to epilepsy in Colombia, 75% of which (3.91 DALYs) are due to premature mortality, with a higher burden in men (6.12 DALYs) than in women (4.41 DALYs). We reported new estimations on epilepsy incidence and prevalence by age groups in Colombia and conclude that DALYs lost due to epilepsy in Colombia are almost double the previous figure, mostly because of the underestimation of attributable mortality. With this figure, epilepsy ranks 12th instead of 19th in the list of the most important causes of DALYs lost. © 2015 S. Karger AG, Basel.

  12. Enfermedad cerebrovascular en Colombia Cerebrovascular disease in Colombia

    Directory of Open Access Journals (Sweden)

    Federico A Silva

    2006-10-01

    Full Text Available Introducción: la enfermedad cerebrovascular constituye un problema de salud pública mundial. En Colombia es la cuarta causa de muerte en la población adulta y genera una alta discapacidad en estos pacientes. Objetivo: describir algunos resultados obtenidos por el grupo de Ciencias Neurovasculares de la Fundación Cardiovascular de Colombia. Desarrollo y conclusiones: la enfermedad cerebrovascular es una entidad con una alta prevalencia en la población colombiana y genera discapacidad mental, motora y del lenguaje. Es necesaria la implementación de unidades de cuidado neurovascular con personal entrenado, protocolos definidos, tratamientos adecuados y tecnología de punta. En Colombia deben imponerse este tipo de unidades dentro del cuidado básico de los pacientes para disminuir la morbilidad, mortalidad y discapacidad generada en estos pacientes. La Fundación Cardiovascular de Colombia es pionera en la implementación de este tipo de cuidados.Introduction: cerebrovascular disease constitutes a worldwide public health problem. In Colombia, it is the fourth leading cause of death in the adult population and generates high disability in these patients. Objective: to describe some results obtained by the Neurovascular Sciences group from the Colombian Cardiovascular Foundation. Development and conclusions: cerebrovascular disease has a high prevalence in the Colombian population and generates mental, motor, and language disabilities. The implementation of neurovascular care units with trained personnel, defined protocols, adequate treatments and high technology, are necessary. This kind of units must be imposed in Colombia as a basic care for these patients in order to decrease morbidity, mortality and disability. The Colombian Cardiovascular Foundation is pioneer in the implementation of these care units.

  13. 75 FR 27401 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-9-30, DC-9-40, and DC-9-50...

    Science.gov (United States)

    2010-05-17

    ... Corporation Model DC- 9-30, DC-9-40, and DC-9-50 Series Airplanes AGENCY: Federal Aviation Administration (FAA... DC-9-30, DC-9-40, and DC-9-50 series airplanes. This AD requires inspecting to determine the part...-30, DC-9-40, and DC-9-50 series airplanes. That NPRM was published in the Federal Register on August...

  14. DC motor operation controlled from a DC/DC power converter in pulse mode with low duty cycle

    OpenAIRE

    Stefanov, Goce; Kukuseva, Maja; Citkuseva Dimitrovska, Biljana

    2016-01-01

    In this paper pulse mode of operation of DC motor controlled by DC/DC power converter is analyzed. DC motor operation with time intervals in which the motor operates without output load is of interest. In this mode it is possible the motor to restore energy. Also, in the paper are represented calculations for the amount of the restored energy in the pulse mode operation of the motor for different duty cycles.

  15. Environmental information in Colombia

    International Nuclear Information System (INIS)

    Velez S, Andres

    2005-01-01

    This article is a chapter from the paper, Elements for the description of an environmental information system, which was written by the author as a requirement for the degree of specialist on environment and Geoinformatics at the school of engineering. Universidad de Antioquia. The original paper attempted a description of the context and development of a particular environmental information system, built at the eastern region of Antioquia by CORNARE (a regional autonomous corporation for the environment and the natural resources). This article refers to the Colombian institutional context for environmental information. With particular emphasis laid on the strategic character that must be conceded to the administration of information. Towards the construction of equitable and sustainable development models under autonomous orientation an efficient and transparent environmental administration as is needed by such models is only attainable through the design and application of environmental information systems committed to the pursuit of collective interests. Here a balance is sought between accomplishments and failures reached during the long standing discussion held in Colombia around the formulation of public policies that acknowledge and strengthen the role of information as a cornerstone of environmental administration, and a contribution towards the goal of human sustainable development

  16. de Cali, Colombia

    Directory of Open Access Journals (Sweden)

    Mauricio Jaramillo Ayerbe

    2007-01-01

    Full Text Available En este trabajo se presentan los resultados de la modelación para la predicción a corto plazo de la concentración de ozono troposférico en la zona urbana de la ciudad de Cali, Colombia, mediante el análisis univariante de series de tiempo. El método se aplicó a una serie de 2.496 datos horarios de concentración de ozono, obtenida en una de las estaciones de la Red de Monitoreo de Calidad del Aire (RMCA de Cali, correspondiente a 104 días consecutivos durante el período abril a julio de 2003. Los datos de los primeros 93 días se utilizaron para la estimación del modelo, y los de los 11 días restantes para la validación del mismo. El modelo propuesto podría ser utilizado por las autoridades ambientales de la región para predecir y alertar a la población sobre posibles episodios de altas concentraciones de ozono que puedan poner en riesgo la salud pública con hasta 8 horas de anticipación.

  17. DC to DC power converters and methods of controlling the same

    Science.gov (United States)

    Steigerwald, Robert Louis; Elasser, Ahmed; Sabate, Juan Antonio; Todorovic, Maja Harfman; Agamy, Mohammed

    2012-12-11

    A power generation system configured to provide direct current (DC) power to a DC link is described. The system includes a first power generation unit configured to output DC power. The system also includes a first DC to DC converter comprising an input section and an output section. The output section of the first DC to DC converter is coupled in series with the first power generation unit. The first DC to DC converter is configured to process a first portion of the DC power output by the first power generation unit and to provide an unprocessed second portion of the DC power output of the first power generation unit to the output section.

  18. Speed Control of DC Motor using AC/AC/DC Converter Based on Intelligent Techniques

    Directory of Open Access Journals (Sweden)

    Rakan Kh Antar

    2013-05-01

    Full Text Available    This paper describes the application of ac/ac/dc and ac/dc converters to control the speed of a separately excited DC motor. Artificial neural network and PI controller are trained to select the desired values of firing angles for triggering thyristors of the ac/ac/dc and ac/dc bridge converters in order to control the speed of the dc motor at a desired value with constant and different load torques in order to obtain the best speed response. Simulation results show that the rising time for ac/dc and ac/ac/dc converters at 250rpm are reduced about 79% and 89% respectively, while delay time it reduced about 69% and 64% respectively. Therefore, speed response of the dc motor is more efficient for closed loop system compared with open loop also the response of ac/ac/dc converter is better than ac/dc converter.

  19. El Patentamiento Universitario en Colombia

    Directory of Open Access Journals (Sweden)

    Diana Milena González Gélvez

    2013-04-01

    Full Text Available El artículo presenta un panorama general del patentamiento que realizan las Universidades en Colombia. Para ello, se realiza un análisis de la información de la base de datos de patentes de la Superintendencia de Industria y Comercio de Colombia desde 1970 hasta 2010. Los resultados permiten observar el estado real del patentamiento Universitario en Colombia, así como identificar las Universidades más exitosas en el proceso de patentamiento y los tiempos reales requeridos para proteger las nuevas creaciones. Así mismo, los resultados son un insumo importante en la determinación de la estrategia de protección que adopten las Universidades Colombianas en cuanto a la protección de sus creaciones.

  20. A Current-Fed Isolated Bidirectional DC-DC Converter

    DEFF Research Database (Denmark)

    Sun, Xiaofeng; Wu, Xiaoying; Shen, Yanfeng

    2017-01-01

    This paper proposes a current-fed isolated bidirectional DC-DC converter (CF-IBDC) which has the advantages of wide input voltage range, low input current ripple, low conduction losses, and soft switching over the full operating range. Compared with conventional CF-IBDCs, the voltage spikes...... of the low-voltage (LV) side switches in the proposed converter can be eliminated without additional clamp circuits. The converter adopts the pulse width modulation (PWM) plus hybrid phase-shift control scheme such that the bus voltage can match the output voltage by means of the transformer. Thus......, the current stresses and conduction losses of the converter become lower. In addition, the practical ZVS of the secondary-side switches can be realized by adjusting the phase-shift angle within the secondary side when in light load or no load condition. The operating principles and characteristics including...

  1. RESONANT STEP-DOWN DC-DC POWER CONVERTERS

    DEFF Research Database (Denmark)

    2015-01-01

    charged from the input voltage and discharged to the output capacitor through the galvanic isolation barrier by a semiconductor switch arrangement in accordance with a switch control signal to produce the converter output voltage. The resonant step-down DC-DC power converter comprises an electrical short...... and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. A resonant network is con- figured for alternatingly being......-circuit connection across the galvanic isolation barrier connecting, in a first case, the second negative electrode of the output capacitor to the positive input terminal of the primary side circuit or, in a second case, connecting the second positive electrode of the output capacitor to the negative input terminal...

  2. Step-Up DC-DC Power Converter

    DEFF Research Database (Denmark)

    2015-01-01

    being charged from the input voltage and discharged to the output capacitor through the galvanic isolation barrier in accordance with a switch control signal to produce the converter output voltage. The step-up DC-DC power converter comprises an electrical short-circuit connection across the galvanic...... capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. A switched energy storage network is configured for alternatingly...... isolation barrier connecting, in a first case, the second negative electrode of the output capacitor to the positive input terminal of the primary side circuit or, in a second case, connecting the second positive electrode of the output capacitor to the negative input terminal of the primary side circuit...

  3. NAMMA DC-8 DROPSONDE V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The NAMMA DC-8 Dropsonde dataset were collected by the DC-8 dropsonde system, which uses an integrated, highly accurate, GPS-located atmospheric profiling dropsonde...

  4. Renewable energy potential in Colombia

    Science.gov (United States)

    Correa Guzman, Jose Luis

    2008-12-01

    Renewable energy flows are very large in comparison with humankind's use of energy. In principle, all our energy needs, both now and into the future, can be met by energy from renewable sources. After many years trying to develop the alternative energy potential of Colombia, a major effort is principally being made since 2000 to explore and assess the renewable resources of the entire country. Until 2000, the availability of conventional energy sources in Colombia prevented renewable energy exploration from reaching a higher level. However, the extreme energy crisis of 1992 - 1993 alerted the authorities and the community to the necessity for exploring alternative energy sources. This energy study is a general approach to the current and future renewable energy scenario of Colombia. It was prepared in response to the increased interest around the world and in particular in Colombia to develop its non-fossil energy prospective. It, therefore, represents a working document giving an initial impression of the possible scale of the main renewables sources as a response to the concern about energy security and fossil fuel dependence problems. The assumptions made and calculations reported may therefore be subject to revision as more information becomes available. The aim of this dissertation is not only to improve the public understanding and discussion of renewable energy matters in Colombia but also to stimulate the development and application of renewable energy, wherever they have prospects of economic viability and environmental acceptability. To achieve such goal this paper reviews several renewable technologies, their availability, contribution and feasibility in Colombia.

  5. Colombia: Who will blink first?

    Directory of Open Access Journals (Sweden)

    Gerhard Drekonja-Kornat

    2014-06-01

    Full Text Available Un presidente que aparenta exteriormente la timidez de un estudiante de bachillerato. Una mujer, Marta Lucía Ramírez, ministra de Defensa por primera vez en la historia de Colombia. Otras seis mujeres en puestos ministeriales, entre ellas Carolina Barco, responsable de la política exterior, cuya madre es ciudadana estadounidense. ¿Es éste el “giro hacia la derecha radical” que, según la interpretación de muchos observadores europeos, atraviesa Colombia luego de la sorprendente victoria electoral del outsider Álvaro Uribe Vélez en mayo de 2002?

  6. Violencia y salud en Colombia

    OpenAIRE

    Saúl Franco Agudelo

    1997-01-01

    La violencia en Colombia parece incontenible. A las masacres y asesinatos colectivos, de una crueldad desconcertante, se suman los secuestros y desapariciones, el maltrato de niños y ancianos y las violaciones de adolescentes. Cada día, sin tregua, los colombianos son espectadores o víctimas de atracos callejeros y de discriminación racial, sexual y socioeconómica. Sin quererlo, se convierten en agentes de agresiones en el transporte urbano, el hogar, la escuela y el trabajo. Colombia tiene l...

  7. Mesoscopic electronics beyond DC transport

    Science.gov (United States)

    di Carlo, Leonardo

    Since the inception of mesoscopic electronics in the 1980's, direct current (dc) measurements have underpinned experiments in quantum transport. Novel techniques complementing dc transport are becoming paramount to new developments in mesoscopic electronics, particularly as the road is paved toward quantum information processing. This thesis describes seven experiments on GaAs/AlGaAs and graphene nanostructures unified by experimental techniques going beyond traditional dc transport. Firstly, dc current induced by microwave radiation applied to an open chaotic quantum dot is investigated. Asymmetry of mesoscopic fluctuations of induced current in perpendicular magnetic field is established as a tool for separating the quantum photovoltaic effect from classical rectification. A differential charge sensing technique is next developed using integrated quantum point contacts to resolve the spatial distribution of charge inside a double quantum clot. An accurate method for determining interdot tunnel coupling and electron temperature using charge sensing is demonstrated. A two-channel system for detecting current noise in mesoscopic conductors is developed, enabling four experiments where shot noise probes transmission properties not available in dc transport and Johnson noise serves as an electron thermometer. Suppressed shot noise is observed in quantum point contacts at zero parallel magnetic field, associated with the 0.7 structure in conductance. This suppression evolves with increasing field into the shot-noise signature of spin-lifted mode degeneracy. Quantitative agreement is found with a phenomenological model for density-dependent mode splitting. Shot noise measurements of multi-lead quantum-dot structures in the Coulomb blockade regime distill the mechanisms by which Coulomb interaction and quantum indistinguishability correlate electron flow. Gate-controlled sign reversal of noise cross correlation in two capacitively-coupled dots is observed, and shown to

  8. Implementation of hierarchical control in DC microgrids

    DEFF Research Database (Denmark)

    Jin, Chi; Wang, Peng; Xiao, Jianfang

    2014-01-01

    DC microgrids are becoming popular in low-voltage distribution systems due to the better compatibility with photovoltaic panels, electric vehicles, and dc loads. This paper presents a practical dc microgrid developed in the Water and Energy Research Laboratory (WERL) in the Nanyang University...

  9. Five-Level Active-Neutral-Point-Clamped DC/DC Converter for Medium-Voltage DC Grids

    DEFF Research Database (Denmark)

    Liu, Dong; Deng, Fujin; Chen, Zhe

    2017-01-01

    /dt, reduce voltage stress on the transformer, and thus reduce the electromagnetic interference (EMI) and increase reliability. An elimination method for the dead time effect is also proposed along with the proposed modulation strategy by employing a switch in series with the flying capacitor, which can......This paper proposes a five-level active-neutralpoint- clamped (5L-ANPC) dc/dc converter for applications in medium voltage dc (MVDC) grids. A modulation strategy is proposed for the 5L-ANPC dc/dc converter to generate multilevel voltage waveforms, which can effectively reduce voltage change rate dv...

  10. Serpientes de Colombia

    Directory of Open Access Journals (Sweden)

    M. Rodrigo Ángel

    1983-06-01

    Full Text Available En este libro es una guía práctica sobre las serpientes de Colombia en cuanto a su clasificación y tratamiento del envenenamiento causado por sus mordeduras. Contiene los siguientes capítulos: 1. Características generales, 2. Serpiente Colombianas, 3. Aparato venenoso, 4. Clasificación fisiopatología de los efectos del veneno, 5. Mordedura por serpientes venenosas en Antioquía, listas de nombres populares y científicos, la bibliografía. Esta es una introducción a esta práctica guía sobre las serpientes Colombianas: Desde el origen del hombre, a través de la evolución de las distintas culturas y aún en la época actual en un amplio sector sociocultural, la serpiente ha sido considerada como un animal dotado de ciertos poderes sobrenaturales, bien sea como fuente de mal, de beneficio, de poder, de sabiduría o de salud. Considerada por su aspecto tóxico, la influencia en la patología humana es evidente y de gran importancia como causa de morbilidad sobre todo en aquellos países donde se le considera animal sagrado. En el aspecto simbólico, el folklor es abundante en creencias y tradiciones, que generalmente coinciden en la mayoría de los pueblos. En un país tropical como Colombia, con diversidad de climas y bosques, las serpientes venenosas de gran poder tóxico son también abundantes y significan un peligro real para nuestra población campesina en lucha abierta con la naturaleza. Los envenenamientos causados por sus mordeduras, graves de por sí, empeoran frecuentemente debido a diversos factores tales como la escasez y alto costo del suero antiofídico y la demora en la atención médica, condicionada esta última no sólo por la deficiencias de nuestras vías de comunicación, sino por la influencia nefasta del curandero. Sobre tema tan importante de nuestra patología, es entonces necesario que nuestras instituciones educativas y las encargadas de velar por la salud, se preocupen no sólo por su

  11. EL ADOLESCENTE EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Antonio Ucros Cuellar

    1982-10-01

    Full Text Available

    Variables fisiológicas del desarrollo Pondo - Estatural y Sexual


    Los estudios que hasta ahora se han hecho en Colombia sobre adolescencia son fragmentarios e incompletos por no decir que inexistentes; sin embargo ésta no es una situación particular de nuestro país porque en otros países de América Latina tampoco existen estudios sistemáticos y los que hay también son incompletos. Para llenar una
    parte de este vacío elaboramos (Ucrós y Casas un trabajo con el objeto de fijar las variables fisiológicas el adolescente en nuestro medio; se tomó un grupo de 2.500 sujetos que se estudiaron en forma longitudinal durante un lapso de 7 años con un total de 23.000 registros. Hasta donde es posible establecer, este es el estudio más completo que se
    ha efectuado en Colombia ya que tuvo un diseño metodológico pre-establecido, un análisis estadístico riguroso y una muestra suficientemente numerosa.
    La metodología de la investigación se describe en las secciones pertinentes.

    FORMA DE ESTUDIAR AL ADOLESCENTE
    Al adolescente hay que estudiarlo integralmente, es decir, valorando simultáneamente la maduración de cada una de sus variables. El concepto armónico de ese desarrollo debe ser fijado por el examen médico y sicológico, ayudado por métodos paraclínicos.
    Como punto de partida debe fijarse la fecha de nacimiento, variable de la cual van a depender las otras. Esquemáticamente debemos establecer las siguientes edades:
    1. Edad cronológica
    2. Edad por estatura-variables antropométricas
    3. Desarrollo sexual
    4. Edad ósea
    5. Edad mental
    6. Edad dentaria

    Si bien en la niñez y en el estado adulto las distintas edades coinciden cronológicamente dando una idea de la madurez armónica, en el adolescente no suelen coincidir y la disarmonía del desarrollo es casi la regla. Es frecuente y normal observar que a una misma edad

  12. de Manizales, Colombia

    Directory of Open Access Journals (Sweden)

    Hernán Humberto Vargas López

    2007-01-01

    Full Text Available El presente artículo se deriva de una investigación realizada con 29 jóvenes escolarizados de la ciudad de Manizales, Colombia, en la cual se indagó por los sentidos y significados de la ciudadanía. Para la recolección de información se utilizó el taller pedagógico, en tanto permitió combinar diversas técnicas e instrumentos tales como la entrevista semiestructurada, la entrevista a profundidad y la discusión. El estudio concluye que las y los jóvenes significan y comprenden la ciudadanía desde cuatro referentes: el lugar del sujeto en la sociedad y la cultura, el sentido del derecho y la ley en la organización y la convivencia, las percepciones del actuar moral y político de los líderes y de los políticos, y las percepciones y consumos de ciudad que hacen los ciudadanos. Se concluye que las y los jóvenes sitúan la ciudadanía desde un referente de la acción, manifestado fundamentalmente en la participación, el enjuiciamiento político y la posibilidad de ser representados por otros. Igualmente, se plantea que las y los jóvenes orientan la ciudadanía desde los principios y marcos de significación cultural de ciudad, expresados en los vínculos y compromisos que adquieren los ciudadanos con su ciudad y viceversa. Finalmente, se afirma que se trata de una ciudadanía significada en el respeto, la libertad, la justicia social y el reconocimiento del potencial humano universal

  13. Phytochemical research of leaves and flowers of Smallanthus pyramidalis (Triana) H. Rob. (Arboloco) and its use in the recovery of wetlands in Bogota

    International Nuclear Information System (INIS)

    Guzman Avendano, Antonio J; Barrera Adame, Diana A.

    2011-01-01

    This research focused on the phytochemical characterization of the species Smallanthus pyramidalis (Triana) H. Rob. in order to identify the secondary metabolites of flowers and leaves. This is due to the importance these trees on the sustainable development of the wetlands in the Sabana de Bogota, and its possible application as a promising species in the use and conservation of these ecosystems. We performed preliminary chemical tests, fractionation using conventional techniques, identification of physical and chemical properties, and structural analysis using spectroscopic and spectrometric techniques, such as UV, 1H-RMN, 13C-RMN and GC-MS. We identified alkane-type compounds, steroids, terpenoids and flavonoids mainly, and their role in the plant and the ecosystem.

  14. A Family of Four Quadrant DC/DC Converters with Reduced Number of Components

    DEFF Research Database (Denmark)

    Mostaan, Ali; Soltani, Mohsen

    2015-01-01

    A family of four quadrant DC/DC converters is presented in this paper. Compare with existing four quadrant DC/DC converters that have been introduced in literature, the proposed converters have lower number of components. There are two bidirectional switches, two coupled inductors and one capacitor...

  15. A Survey on Voltage Boosting Techniques for Step-Up DC-DC Converters

    DEFF Research Database (Denmark)

    Forouzesh, Mojtaba; Siwakoti, Yam Prasad; Gorji, Saman Asghari

    2016-01-01

    Step-up dc-dc converters are used to boost the voltage level of the input to a higher output level. Despite of its features such as simplicity of implementation, the fundamental boost dc-dc converter has shortcomings such as low boost ability and low power density. With these limitations, researc...

  16. A Fixed-Frequency Bidirectional Resonant DC-DC Converter Suitable for Wide Voltage Gain Range

    DEFF Research Database (Denmark)

    Shen, Yanfeng; Wang, Huai; Blaabjerg, Frede

    2017-01-01

    This paper proposes a new bidirectional resonant dc-dc converter suitable for wide voltage gain range applications (e.g., energy storage systems). The proposed converter overcomes the narrow voltage gain range of conventional resonant DC-DC converters, and meanwhile achieves high efficiency. It i...

  17. A DC-DC Conversion Powering Scheme for the CMS Phase-1 Pixel Upgrade

    CERN Document Server

    Feld, Lutz Werner; Marcel Friedrichs; Richard Hensch; Karpinski, Waclaw; Klein, Katja; Sammet, Jan Domenik; Wlochal, Michael

    2012-01-01

    The powering scheme of the CMS pixel detector will be described, and the performance of prototype DC-DC buck converters will be presented, including power efficiency, system tests with DC-DC converters and pixel modules, thermal management, reliability at low temperature, and studies of potential frequency locking betwe...

  18. DC Microgrids – Part I

    DEFF Research Database (Denmark)

    Dragicevic, Tomislav; Lu, Xiaonan; Quintero, Juan Carlos Vasquez

    2016-01-01

    This paper presents a review of control strategies, stability analysis and stabilization techniques for DC microgrids (MGs). Overall control is systematically classified into local and coordinated control levels according to respective functionalities in each level. As opposed to local control...... strategies to achieve various control objectives are reviewed in the paper. Moreover, properties of DC MG dynamics and stability are discussed. The paper illustrates that tightly regulated point-of-load (POL) converters tend to reduce the stability margins of the system since they introduce negative...... which relies only on local measurements, some line of communication between units needs to be made available in order to achieve coordinated control. Depending on the communication method, three basic coordinated control strategies can be distinguished, i.e. decentralized, centralized and distributed...

  19. Linking DC together with TRSL

    DEFF Research Database (Denmark)

    Haxthausen, Anne; Yong, Xia

    1999-01-01

    (parts of) the history of the observables of the system,and then define a satisfaction relation in terms of behaviours. DC has previously been linked together with subsets of other event-based process algebra languages, but using another approach:the event-based languages were given a denotational...... of constraints on the durations of states of the system, i.e. at a high level of abstraction.However, as a state-based logic, it lacks the ability to specifysequential programs and communicating concurrent processes at a concrete level. The Timed RAISE Specification Language (TRSL) [XG99] has this ability.......TRSL is a real-time extension of the RAISE Specification Language (RSL) [Rlg92] which together with its associated method [Rmg95]and tools has shown to be very useful in the industrial development of software systems. Therefore, a promising approach for the development of real-time systemscould be to use DC...

  20. A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

    Directory of Open Access Journals (Sweden)

    Haojie Wang

    2016-07-01

    Full Text Available It is a common practice for storage batteries to be connected to DC microgrid buses through DC-DC converters for voltage support on islanded operation mode. A feed-forward control based dual-loop constant voltage PI control for three-branch interleaved DC-DC converters (TIDC is proposed for storage batteries in DC microgrids. The working principle of TIDC is analyzed, and the factors influencing the response rate based on the dual-loop constant voltage control for TIDC are discussed, and then the method of feed-forward control for TIDC is studied to improve the response rate for load changing. A prototype of the TIDC is developed and an experimental platform is built. The experiment results show that DC bus voltage sags or swells caused by load changing can be reduced and the time for voltage recovery can be decreased significantly with the proposed feed-forward control.

  1. AC-DC PFC Converter Using Combination of Flyback Converter and Full-bridge DC-DC Converter

    Directory of Open Access Journals (Sweden)

    Moh. Zaenal Efendi

    2014-06-01

    Full Text Available This paper presents a combination of power factor correction converter using Flyback converter and Full-bridge dc-dc converter in series connection. Flyback converter is operated in discontinuous conduction mode so that it can serve as a power factor correction converter and meanwhile Full-bridge dc-dc converter is used for dc regulator. This converter system is designed to produce a 86 Volt of output voltage and 2 A of output current. Both simulation and experiment results show that the power factor of this converter achieves up to 0.99 and meets harmonic standard of IEC61000-3-2. Keywords: Flyback Converter, Full-bridge DC-DC Converter, Power Factor Correction.

  2. 75 FR 36579 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-30, DC-10-30F, DC-10-30F (KC...

    Science.gov (United States)

    2010-06-28

    ... Corporation Model DC- 10-30, DC-10-30F, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, and MD-10-30F...). SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Model DC-10-30, DC-10-30F, DC-10-30F (KC-10A and KDC-10), DC- 10-40, DC10-40F, and MD-10-30F airplanes. This proposed AD would...

  3. 75 FR 61352 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-10-30, DC-10-30F, DC-10-30F (KC...

    Science.gov (United States)

    2010-10-05

    ... Corporation Model DC- 10-30, DC-10-30F, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC-10-40F, and MD-10-30F... new airworthiness directive (AD) for certain Model DC-10-30, DC-10-30F, DC-10-30F (KC-10A and KDC-10), DC-10-40, DC- 10-40F, and MD-10-30F airplanes. This AD requires doing a one-time inspection of the...

  4. Caracterización citogenética de lucilia sericata (Meigen, 1826 (Diptera: calliphoridae, Cepa Bogotá, Colombia

    Directory of Open Access Journals (Sweden)

    Yisethe Acuña Morera

    2011-08-01

    Full Text Available Objective: Lucilia sericata is an important species for medical and forensic purposes, it is used in maggot therapy in the treatment of chronic wounds and in medical-legal studies for establishing the post-mortem interval and the transfer of corpses. Currently there are no records of the cytogenetic characteristics of this fly in Neotropical region. The main objective of this study wasto identify morphometric characteristics and primary structures fromkaryotype of L. sericata strain Bogota, Colombia. Methods and materials: Embryonated eggs were taken, which were previously surface sterilized, macerated and then seeded in L-15 medium culture, supplemented with 20% fbs and incubated at 28 ºC, without C02 atmosphere. The preparation of chromosomeswas obtained from semiconfluent monolayers, pretreated with various solutions: antimitotic (Colchicine, hypotonic (KCl 0.075 M and fixative (Carnoy, methanol and acetic acid, 3:1. C-banding technique was carried out to identify chromosomal regions of constitutive heterochromatin. Results: Morphometric parameters were obtained from each pair of chromosomes. The diploid karyotype number obtained from cell cultures was 2n = 12; they were classified morphologically,according to patterns established previously, as follows: pairs I,ç II, IV and V were metacentric and pair III was submetacentric. On the other hand, the sexual pair was heteromorphic, being X chromosome metacentric and Y chromosome submetacentric. C banding was positive for all chromosome pairs. Conclusions: The cytogenetic characteristics of L. sericata, strain Bogotá, were established according to number, shape, centromer position and heterochromatic regions.

  5. Preliminary methodological proposal for estimating environmental flows in projects approved by the ministry of environment and sustainable development (MADS), Colombia

    International Nuclear Information System (INIS)

    Pinilla Agudelo, Gabriel A; Rodriguez Sandoval, Erasmo A; Camacho Botero, Luis A

    2014-01-01

    A methodological proposal for estimating environmental flows in large projects approved by Agencia Nacional de Licencias Ambientales (ANLA) in Colombian rivers was developed. The project is the result of an agreement between the MADS and the Universidad Nacional de Colombia, Bogota (UNC). The proposed method begins with an evaluation of hydrological criteria, continues with a hydraulic and water quality validation, and follows with the determination of habitat integrity. This is an iterative process that compares conditions before and after the project construction and allows to obtain the magnitude of a monthly flow that, besides preserving the ecological functions of the river, guarantees the water uses downstream. Regarding to the biotic component, the proposal includes the establishment and monitoring of biotic integrity indices for four aquatic communities (periphyton, macro invertebrates, riparian vegetation, and fish). The effects that flow reduction may produce in the medium and long term can be assessed by these indices. We present the results of applying the methodology to several projects licensed by the MADS.

  6. Colombia es una cosa penetrable

    Directory of Open Access Journals (Sweden)

    Gilberto Loaiza Cano

    2007-10-01

    Full Text Available Colombia es una cosa impenetrable. Raíces de la intolerancia y otros ensayos sobre historia política y vida intelectual. Juan Guillermo Gómez García. Bogotá, Diente de León, 2006, 454 pág.

  7. Pseudotectites from Colombia and Peru

    NARCIS (Netherlands)

    Martin, R.; Sitter-Koomans, de C.

    1955-01-01

    In a previous note on “Americanites” (Martin, 1934) from Colombia and Peru, the writer came to the conclusion, on the basis solely of published data, that it was very likely that these so-called tectites are in reality obsidian of terrestrial origin. He stated, however, that “before it is possible

  8. Studies about paramilitarism in colombia

    OpenAIRE

    Cruz Rodríguez, Edwin

    2007-01-01

    This article presents focuses, conceptions, hypotheses and methodologies that build up the bibliography of paramilitarism in Colombia, also briefing a series of new study perspectives of the phenomenon such as discourse analysis, complexity centered focus, organizational analysis, and theoretical perspectives. Finally, some gaps in the literature are highlighted.

  9. Solving Colombia’s Problems

    Science.gov (United States)

    2003-04-07

    parties for political control during the period from 1948 to 1953.15 “During this period, referred to as ‘La Violencia ,’ groups of armed men paid by...surprise to those familiar with the Colombia government history of mishandling foreign aid in the war against drugs and in their parallel inability to

  10. [Burnout Syndrome, Family and Work Related Variables on General Practitioners in Bogota. A Strategy of Work Quality].

    Science.gov (United States)

    Aguirre Roldán, Adriana María; Quijano Barriga, Ana María

    2015-01-01

    The burnout syndrome is a set of work-related symptoms related to weariness and exhaustion, in response to the emotional stress at work and its consequences. The aim of the study was to measure the frequency of burnout in General Practitioners (GPs) from 3 private institutions in Bogotá, Colombia and to determine the associated factors according to the variables taken into account. It is a descriptive cross-sectional study which was used to analyse the Questionnaire for Burnout Syndrome (CESQT). The population was 106 GPs. The level of burnout was at a critical level in 6.6% of the GP population. The variables showed that having a stable partner and children are a protective factor. By contrast, work in emergency rooms is a risk factor. Copyright © 2014 Asociación Colombiana de Psiquiatría. Publicado por Elsevier España. All rights reserved.

  11. VENTAJAS ARANCELARIAS OTORGADAS POR ESTADOS UNIDOS POR MEDIO DEL ATPDEA, APROVECHABLES PARA LAS PyMES DE BOGOTA Y CUNDINAMARCA

    Directory of Open Access Journals (Sweden)

    Mario Ernesto

    2003-07-01

    Full Text Available En medio de la crisis de desempleo, pobreza y desigualdad que afronta Colombia, las pequeñas y medianas empresas se han convertido en una alternativa importante de generación de trabajo y valor agregado. Sin embargo, éstas deben aprovechar las ventajas que se otorgaron al país en el marco del ATPDEA, por medio del cual los Estados Unidos concedió preferencias arancelarias a más de cinco mil seiscientos productos que estuvieron vigentes durante más de diez años, y que luego, a partir de septiembre del 2002, se ampliaron en más de seiscientos productos. En este trabajo se presentan los rubros de la lista adicional, que presentan posibilidades de exportación a los Estados Unidos por parte de las PyMES de Bogotá y Cundinamarca.

  12. 77 FR 14594 - Additions to the Identifying Information for an Individual Previously Designated Pursuant to the...

    Science.gov (United States)

    2012-03-12

    ...., Bogota, Colombia; c/o CUBICAFE S.A., Bogota, Colombia; c/o CUBI CAFE CLICK CUBE MEXICO, S.A. DE C.V., Mexico City, Distrito Federal, Mexico; c/o DESARROLLO MINERO RESPONSABLE C.I. S.A.S., Bogota, Colombia; c..., Colombia; c/o INVERPUNTO DEL VALLE S.A., Cali, Colombia; c/o INVERSIONES CIFUENTES Y CIA. S. EN C...

  13. Mining Taxation in Colombia

    Directory of Open Access Journals (Sweden)

    Duanjie Chen

    2015-02-01

    Full Text Available This paper first assesses the current Colombian mining tax-and-royalty regime in comparison with other countries from the points of view of efficiency, competitiveness and revenue performance. It then discusses the theoretical convenience of introducing alternative designs for a resource rent tax (RRT to be applied to new mining projects, together with a reduced common royalty rate for all minerals, and simulates their potential efficiency, competitiveness and revenue-performance effects. In particular, it examines alternative interactions between the RRT, the royalty regime and the corporate income tax (royalties creditable against the RRT or deductible from its tax base; accepting or not corporate income tax deductibility from the RRT tax base, under alternative RRT tax rates. It also discusses alternative capital return allowances and the pros and cons of project-by-project versus sectorial ring fencing, and sharing RRT revenues between the national and sub-national governments. It concludes with a detailed blueprint for reform based on these discussions, assessments and simulations, as well as political economy and administrative considerations for the specific case of Colombia. Este trabajo evalúa la eficiencia, competitividad y capacidad de recaudo del régimen tributario y de regalías colombiano en comparación con el de otros países mineros relevantes. Posteriormente, propone la implementación de un “Resource Rent Tax” (RRT para proyectos mineros futuros (junto con una reducción y unificación de la tasa de regalías entre minerales y modela el impacto que tendría éste sobre la eficiencia y el recaudo. Se examinan la interacción entre el RRT, las regalías y el impuesto de renta bajo distintos diseños y tasas de RRT y costo de oportunidad del capital. También se analiza si es preferible tener “ringfencing” a nivel de proyecto o a nivel sectorial. El trabajo concluye con una propuesta de reforma junto con consideraciones

  14. A Feedback Passivation Design for DC Microgrid and Its DC/DC Converters

    Directory of Open Access Journals (Sweden)

    Feifan Ji

    2016-12-01

    Full Text Available There are difficulties in analyzing the stability of microgrids since they are located on various network structures. However, considering that the network often consists of passive elements, the passivity theory is applied in this paper to solve the above-mentioned problem. It has been formerly shown that when the network is weakly strictly positive real (WSPR, the DC microgrid is stable if all interfaces between the microgrid and converters are made to be passive, which is called interface passivity. Then, the feedback passivation method is proposed for the controller design of various DC–DC converters to achieve the interface passivity. The interface passivity is different from the passivity of closed-loop systems on which the passivity based control (PBC concentrates. The feedback passivation design is detailed for typical buck converters and boost converters in terms of conditions that the controller parameters should satisfy. The theoretical results are verified by a hardware-in-loop real-time labotray (RTLab simulation of a DC microgrid with four generators.

  15. 77 FR 25536 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2012-04-30

    ... (Colombia) (individual) [SDNT]. 6. RODRIGUEZ CONRADO, Elmer Martin, c/o COPSERVIR LTDA., Bogota, Colombia; c... MIGUEL RODRIGUEZ E HIJO, Cali, Colombia; c/o RADIO UNIDAS FM S.A., Cali, Colombia; c/o REVISTA DEL...

  16. Pasteur en Colombia

    Directory of Open Access Journals (Sweden)

    Alfredo Bárcenas lsaacs

    1986-08-01

    Full Text Available

    Simposio Internacional sobre Inmunización y Producción de Vacunas, Bogotá, 29 de Septiembre de 1985.

    La Sociedad Colombiana de Historia de la Medicina recibió del Comité Organizador de la reunión que hoy nos congrega, la solicitud de presentar el tema de la influencia de Luís Pasteur en la América Latina. La Sociedad mencionada tuvo a bien encargarme de tan honroso cometido; sin embargo, habida cuenta de la vastedad de nuestro continente, del largo tiempo que se requiere para consultar responsable y juiciosamente archivos y bibliotecas en los diferentes países, además de los viajes que hubiera sido necesario realizar, decliné tan atractiva y desafiante tarea, pero propuse, en cambio, que se me permitiera abordar el tema circunscribiéndolo a Colombia.

    Me doy cuenta cabal de que lo que diga pudiera parecer estrecho o parroquial a este distinguido concurso de personalidades provenientes de tan diversas latitudes. No obstante, me atrevo a creer que lo que aconteció en Colombia al advenimiento de las ideas y de los descubrimientos de Pasteur, no debe diferir demasiado de lo sucedido en otras naciones, a las cuales Bolívar agrupó en una sola cuando dijo “para nosotros la patria es América”.

    Con la salvedad expresada, trataré de cumplir con la generosa designación que he recibido de la Sociedad Colombiana de Historia de la Medicina, a la cual me complazco en pertenecer y a cuyo presidente y Junta Directiva agradezco la distinción que me hacen.

    En este año de 1985 se cumplen y se celebran cien de la primera aplicación humana de la vacuna antirrábica debida a Pasteur. Se conmemora también el centenario de la muerte de Víctor Hugo, uno de los más grandes escritores y poetas de la humanidad. Siempre he creído que estos dos hijos insignes de la Francia del Siglo XIX, se distinguieron por el respeto, el afecto y la admiración que les profesaron sus contemporáneos y entre

  17. Outlook of the process of storage of oncology drugs from the logistic operator in Colombia

    Directory of Open Access Journals (Sweden)

    Pedro Vicente Sánchez-Calvera

    2014-05-01

    Full Text Available This article mainly on the problem of  storage of oncology drugs, which is an important element in the supply chain, applied in the context of warehouse management of oncology drugs, in the logistics operator and providers of health services institutions (IPS for its acronym in Spanish of Bogotá DC and in the contex of a macro project "Methodological proposal for the definition of policies , rules of negotation and coordination in supply management of oncology drugs in Colombia," funded by Colciencias and the Universidad Nacional of Colombia. This article presents the current situation of oncology drugs, marking a characterization, diagnosis and identification and startegies evaluated under different scenarios. Finally, it is presented a proposal of improvement applied tranversely to storage processes including labels such as just in Time and the application of information and communication technologies (ICT.

  18. The consequences of hospital autonomization in Colombia: a transaction cost economics analysis.

    Science.gov (United States)

    Castano, Ramon; Mills, Anne

    2013-03-01

    Granting autonomy to public hospitals in developing countries has been common over recent decades, and implies a shift from hierarchical to contract-based relationships with health authorities. Theory on transactions costs in contractual relationships suggests they stem from relationship-specific investments and contract incompleteness. Transaction cost economics argues that the parties involved in exchanges seek to reduce transaction costs. The objective of this research was to analyse the relationships observed between purchasers and the 22 public hospitals of the city of Bogota, Colombia, in order to understand the role of relationship-specific investments and contract incompleteness as sources of transaction costs, through a largely qualitative study. We found that contract-based relationships showed relevant transaction costs associated mainly with contract incompleteness, not with relationship-specific investments. Regarding relationships between insurers and local hospitals for primary care services, compulsory contracting regulations locked-in the parties to the contracts. For high-complexity services (e.g. inpatient care), no restrictions applied and relationships suggested transaction-cost minimizing behaviour. Contract incompleteness was found to be a source of transaction costs on its own. We conclude that transaction costs seemed to play a key role in contract-based relationships, and contract incompleteness by itself appeared to be a source of transaction costs. The same findings are likely in other contexts because of difficulties in defining, observing and verifying the contracted products and the underlying information asymmetries. The role of compulsory contracting might be context-specific, although it is likely to emerge in other settings due to the safety-net role of public hospitals.

  19. Assessing the deep drilling potential of Lago de Tota, Colombia, with a seismic survey

    Science.gov (United States)

    Bird, B. W.; Wattrus, N. J.; Fonseca, H.; Velasco, F.; Escobar, J.

    2015-12-01

    Reconciling orbital-scale patterns of inter-hemispheric South American climate during the Quaternary requires continuous, high-resolution paleoclimate records that span multiple glacial cycles from both hemispheres. Southern Andean Quaternary climates are represented by multi-proxy results from Lake Titicaca (Peru-Bolivia) spanning the last 400 ka and by pending results from the Lago Junin Drilling Project (Peru). Although Northern Andean sediment records spanning the last few million years have been retrieved from the Bogota and Fúquene Basins in the Eastern Cordillera of the Colombian Andes, climatic reconstructions based on these cores have thus far been limited to pollen-based investigations. When viewed together with the Southern Hemisphere results, these records suggest an anti-phased hemispheric climatic response during glacial cycles. In order to better assess orbital-scale climate responses, however, independent temperature and hydroclimate proxies from the Northern Hemisphere are needed in addition to vegetation histories. As part of this objective, an effort is underway to develop a paleoclimate record from Lago de Tota (3030 m asl), the largest lake in Colombia and the third largest lake in the Andes. One of 17 highland tectonic basins in Eastern Cordillera, Lago de Tota formed during Tertiary uplift that deformed pre-foreland megasequences, synrift and back-arc megasequences. The precise age and thickness of sediments in the Lago de Tota basin has not previously been established. Here, we present results from a recent single-channel seismic reflection survey collected with a small (5 cubic inch) air gun and high-resolution CHIRP sub-bottom data. With these data, we examine the depositional history and sequence stratigraphy of Lago de Tota and assess its potential as a deep drilling target.

  20. Experiments with a dc motor

    International Nuclear Information System (INIS)

    Kraftmakher, Yaakov

    2010-01-01

    Experiments with an electric motor provide good opportunity to demonstrate some basic laws of electricity and magnetism. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the rotation velocity. The tight relationship between the mechanical and electrical parameters of the motor is clearly seen. The measurements are carried out with the ScienceWorkshop data-acquisition system and the DataStudio software from PASCO scientific. The experiments are well related to university courses of electricity and magnetism and can be used in undergraduate laboratories or for lecture demonstrations.

  1. Using PBL to Improve Educational Outcomes and Student Satisfaction in the Teaching of DC/DC and DC/AC Converters

    Science.gov (United States)

    Martinez-Rodrigo, Fernando; Herrero-De Lucas, Luis Carlos; de Pablo, Santiago; Rey-Boue, Alexis B.

    2017-01-01

    This paper examines the question of how to use project-based learning to increase student performance and satisfaction in a power electronics course addressing the topics of dc/dc and dc/ac converters, the assembly of a dc/dc converter, and the use of a commercial speed drive. A detailed presentation of the methodology is shown, and the results…

  2. Chaos analysis and chaotic EMI suppression of DC-DC converters

    CERN Document Server

    Zhang, Bo

    2014-01-01

    Introduces chaos theory, its analytical methods and the means to apply chaos to the switching power supply design DC-DC converters are typical switching systems which have plenty of nonlinear behaviors, such as bifurcation and chaos. The nonlinear behaviors of DC-DC converters have been studied heavily over the past 20 years, yet researchers are still unsure of the practical application of bifurcations and chaos in switching converters. The electromagnetic interference (EMI), which resulted from the high rates of changes of voltage and current, has become a major design criterion in DC-DC co

  3. Elimination of output voltage oscillations in DC-DC converter using PWM with PI controller

    Directory of Open Access Journals (Sweden)

    Sreenivasappa Veeranna Bhupasandra

    2010-01-01

    Full Text Available In this paper the SIMULINK model of a PWM controlled DC-DC converter is modeled using switching function concept to control the speed of the DC motor. The presence of the voltage oscillation cycles due to higher switching frequency in the DC-DC converter is identified. The effect of these oscillations on the output voltage of the converter, Armature current, Developed torque and Speed of the DC motor is analyzed. In order to minimize the oscillation cycles the PI controller is proposed in the PWM controller.

  4. Hierarchical Velocity Control Based on Differential Flatness for a DC/DC Buck Converter-DC Motor System

    Directory of Open Access Journals (Sweden)

    R. Silva-Ortigoza

    2014-01-01

    Full Text Available This paper presents a hierarchical controller that carries out the angular velocity trajectory tracking task for a DC motor driven by a DC/DC Buck converter. The high level control is related to the DC motor and the low level control is dedicated to the DC/DC Buck converter; both controls are designed via differential flatness. The high level control provides a desired voltage profile for the DC motor to achieve the tracking of a desired angular velocity trajectory. Then, a low level control is designed to ensure that the output voltage of the DC/DC Buck converter tracks the voltage profile imposed by the high level control. In order to experimentally verify the hierarchical controller performance, a DS1104 electronic board from dSPACE and Matlab-Simulink are used. The switched implementation of the hierarchical average controller is accomplished by means of pulse width modulation. Experimental results of the hierarchical controller for the velocity trajectory tracking task show good performance and robustness against the uncertainties associated with different system parameters.

  5. High current DC ion beams

    International Nuclear Information System (INIS)

    Shubaly, M.R.; de Jong, M.S.

    1983-01-01

    Development of high-current cw accelerators such as ZEBRA and FMIT, use of high current dc ion beams in industry for sputtering and material treatment, and scientific applications such as heavy-ion fusion and plasma physics diagnostics have provided the impetus for ion source development programs at many laboratories. At Chalk River, development of efficient plasma generators and reliable extraction columns to provide high quality beams of hydrogen, nitrogen, argon and xenon is underway. DC beams of up to 850 mA (limited by available power supplies) of hydrogen, 200 mA of nitrogen, 155 mA of argon and 100 mA of xenon have been produced with good reliability. DuoPIGatrons, with and without magnetic cusps, are used to generate a high density, reasonably quiescent plasma. Multi-aperture accel-decel columns are used for extraction with shaped apertures and beamlet steering to improve beam quality. This paper describes the performance of these sources and identifies some of the remaining problems. Guidelines for extraction column design, and experience with transporting high current beams are also presented

  6. Violencia y salud en Colombia

    Directory of Open Access Journals (Sweden)

    Saúl Franco Agudelo

    1997-02-01

    Full Text Available La violencia en Colombia parece incontenible. A las masacres y asesinatos colectivos, de una crueldad desconcertante, se suman los secuestros y desapariciones, el maltrato de niños y ancianos y las violaciones de adolescentes. Cada día, sin tregua, los colombianos son espectadores o víctimas de atracos callejeros y de discriminación racial, sexual y socioeconómica. Sin quererlo, se convierten en agentes de agresiones en el transporte urbano, el hogar, la escuela y el trabajo. Colombia tiene las tasas de mortalidad por homicidio más altas del mundo. Independientemente de la enorme sobrecarga institucional que impone a los servicios de salud y medicina legal, la violencia constituye actualmente en Colombia el principal problema de salud pública. Para hacerle frente, el sector de la salud debe elaborar políticas y financiar acciones; crear nuevos procesos de formación de personal, poner en marcha procesos de educación pública, y dedicar mayor esfuerzo y creatividad al campo de la investigación, que hasta ahora ha dado respuestas importantes pero aún insuficientes. Al reflexionar sobre la violencia, que es la sustitución de toda argumentación por la fuerza, es necesario ubicarla en el contexto de la vida y la salud. No se pretende solo racionalizarla, y menos aún sustituir la acción por la palabra o por las reflexiones, sino tratar de comprenderla a fondo con el objeto de buscarle alternativas. En el presente artículo se analiza, con esta finalidad, el tema de la violencia en Colombia, principalmente desde el punto de vista de su efecto en la salud de los colombianos y de sus implicaciones para el sector sanitario. El autor expone sus puntos de vista con plena conciencia de su subjetividad y limitaciones.

  7. El Primer Ferrocarril En Colombia

    Directory of Open Access Journals (Sweden)

    Gabriel Poveda

    2002-01-01

    Full Text Available Se presenta la historia de los preparativos, la construcción y el funcionamiento del primer ferrocarril que existió en el territorio de la actual Colombia (sin incluir a Panamá que unió a Barranquilla con el mar Caribe. Se muestra la importancia tecnológica y económica que esta obra tuvo para el país mientras existió (de 1869 a 1941

  8. La industria maltera en colombia

    OpenAIRE

    Parra Restrepo, Bernardo

    2011-01-01

    Este artículo estudia la industria maltera de Colombia, su origen, evolución y el estado en que se encuentra. Presenta cifras respecto al comportamiento de la producción y ventas. Muestra las relaciones de propiedad y describe la importancia relativa de la empresa con las otras subsidiarias del grupo económico al que pertenece. De otra parte analiza las relaciones obrero/patronales en el contexto actual y las relaciones con la agroindustria colombiana.

  9. Seismological observations at the Northern Andean region of Colombia: Evidence for a shallowly subducting Caribbean Slab and an extensional regime in the upper plate

    Science.gov (United States)

    Monsalve, G.; Cardona, A.; Yarce, J.; Alvira, D.; Poveda, E.

    2013-05-01

    A number of seismological observations, among which we can mention teleseismic travel time residuals, P to S receiver functions and Pn velocity quantification, suggest a clear distinction between the seismic structure of the crust and uppermost mantle between the plains on the Caribbean coast of Colombia and the mountains at the Northern Andean region. Absolute and relative travel time residuals indicate the presence of a seismically fast material in the upper mantle beneath northern Colombia; preliminary results of Pn studies show a region of relatively slow Pn velocities (between 7.8 and 7.9 km/s) underneath the Caribbean coast, contrasting with values greater than 8 km/s beneath the Central and Western cordilleras of Colombia, and the Pacific coast; receiver functions suggest a significantly thinner crust beneath the Caribbean coast, with a crustal thickness between 25 and 30 km, than beneath the Northern Andean zone at the cordilleras of Colombia, where it exceeds 40 km and reaches about 57 km at the location of Bogota. Besides the obviuos discrepancies that appear in response to different topography, we think that the seismological observations are a consequence of the presence of two very distinct slab segments beneath Colombia and contrasting behaviors of the upper plate, which correspond to Caribbean and Nazca subductions. Our seismic observations can be explained by a shallowly subducting Caribbean Plate, in the absence of an asthenospheric wedge, that steepens at about the location of the Bucaramanga nest, and a thinned continental crust that reflects an extensional component linked to oblique convergence of the Caribbean, which contrasts with the crustal thickening in the Andean Cordillera linked to crustal shortening and Nazca plate subuction. These new data are consistent with the idea of of a relatively warm Nazca slab of Neogene age which seems to have a relatively frontal convergence, and a colder, more buoyant Caribbean slab which represents an

  10. High gain high efficiency resonant DC-DC converter

    Science.gov (United States)

    Shang, Fei

    Low voltage power sources have played an important role in applications such as automotive system, renewable energy power generation and so on, where require a high gain DC-DC step-up converter. The converter is going to sustain a very high input current which can bring many design challenges in the existing topologies, such as high component current stress and power loss, complex and costly design for magnetic components, high input current ripple, etc. A new topology of high gain DCDC step-up converter proposed in this dissertation. The topology has many merits such as high gain capability, high efficiency, low components stress and requirement of the transformer, simple topology with less number of active switching devices, and easy to control. The dissertation carries out theoretical analysis of the proposed topology under different operating modes and the voltage gain has been deduced for each mode. The design of circuit components has been well studied, including the power devices current stress and power, the selection of transformer turns-ratio, the design method of the resonant tank and input current ripple. System dynamic state-space models are acquired by using generalized averaging method. Small signal model of the converter is achieved by linearization of the dynamic model around the operating points. The stability study indicates that the open loop system is stable at all operating points, except some operating points containing RHP zeros which can cause closed loop system unstable. The parameter sensitivity study shows that the system transfer function is not greatly affected by the variation of the leakage inductance and load resistance. A design of PI controller is implemented to achieve the output voltage regulation. Simulations have been carried out to validate the circuit operation and support the design analysis. A 2kW prototype has been built for experimental testing. The experimental results are in a good agreement with the theoretical

  11. Violencia y salud en Colombia Violence and health in Colombia

    Directory of Open Access Journals (Sweden)

    Saúl Franco Agudelo

    1997-02-01

    Full Text Available La violencia en Colombia parece incontenible. A las masacres y asesinatos colectivos, de una crueldad desconcertante, se suman los secuestros y desapariciones, el maltrato de niños y ancianos y las violaciones de adolescentes. Cada día, sin tregua, los colombianos son espectadores o víctimas de atracos callejeros y de discriminación racial, sexual y socioeconómica. Sin quererlo, se convierten en agentes de agresiones en el transporte urbano, el hogar, la escuela y el trabajo. Colombia tiene las tasas de mortalidad por homicidio más altas del mundo. Independientemente de la enorme sobrecarga institucional que impone a los servicios de salud y medicina legal, la violencia constituye actualmente en Colombia el principal problema de salud pública. Para hacerle frente, el sector de la salud debe elaborar políticas y financiar acciones; crear nuevos procesos de formación de personal, poner en marcha procesos de educación pública, y dedicar mayor esfuerzo y creatividad al campo de la investigación, que hasta ahora ha dado respuestas importantes pero aún insuficientes. Al reflexionar sobre la violencia, que es la sustitución de toda argumentación por la fuerza, es necesario ubicarla en el contexto de la vida y la salud. No se pretende solo racionalizarla, y menos aún sustituir la acción por la palabra o por las reflexiones, sino tratar de comprenderla a fondo con el objeto de buscarle alternativas. En el presente artículo se analiza, con esta finalidad, el tema de la violencia en Colombia, principalmente desde el punto de vista de su efecto en la salud de los colombianos y de sus implicaciones para el sector sanitario. El autor expone sus puntos de vista con plena conciencia de su subjetividad y limitaciones.In Colombia, violence seems uncontrollable. Along with massacres and group killings of astonishing cruelty, there are also kidnappings and disappearances, abuse of children and the elderly, and rape of young adolescents. Every day

  12. Violence and health in Colombia Violencia y salud en Colombia

    Directory of Open Access Journals (Sweden)

    Saúl Franco Agudelo

    1997-09-01

    Full Text Available In Colombia, violence seems uncontrollable. Along with massacres and group killings of astonishing cruelty, there are also kidnappings and disappearances, abuse of children and the elderly, and rape of young adolescents. Every day, without respite, Colombians are witnesses or victims of street crimes as well as racial, sexual, and socioeconomic discrimination. Unwillingly, they become agents of aggression in public transport, at home, at school, and at work. Colombia has the highest rates of mortality from homicide in the world. Apart from the enormous institutional burden that violence imposes on the health services and forensic medicine, it now constitutes the principal public health problem in the country. To confront it, the health sector must develop policies and finance actions, develop innovative ways to train personnel, implement public education processes, and devote more effort and greater creativity to research, which up to now has provided some important, albeit insufficient, responses. Violence, which is the substitution of force for any type of dialogue, must be considered within the context of life and health. Doing so is not an attempt to rationalize violence, much less to substitute words or reflection for action, but rather an attempt to understand it in depth in order to search for alternatives. With that goal, this article analyzes the subject of violence in Colombia, principally from the perspective of its effect on the health of the citizens and its implications for the health sector. The author fully recognizes the subjectivity and limitations of the views he expresses herein.La violencia en Colombia parece incontenible. A las masacres y asesinatos colectivos, de una crueldad desconcertante, se suman los secuestros y desapariciones, el maltrato de niños y ancianos y las violaciones de adolescentes. Cada día, sin tregua, los colombianos son espectadores o víctimas de atracos callejeros y de discriminación racial, sexual

  13. Two new families of high-gain dc-dc power electronic converters for dc-microgrids

    Science.gov (United States)

    Prabhala, Venkata Anand Kishore

    Distributing the electric power in dc form is an appealing solution in many applications such as telecommunications, data centers, commercial buildings, and microgrids. A high gain dc-dc power electronic converter can be used to individually link low-voltage elements such as solar panels, fuel cells, and batteries to the dc voltage bus which is usually 400 volts. This way, it is not required to put such elements in a series string to build up their voltages. Consequently, each element can function at it optimal operating point regardless of the other elements in the system. In this dissertation, first a comparative study of dc microgrid architectures and their advantages over their ac counterparts is presented. Voltage level selection of dc distribution systems is discussed from the cost, reliability, efficiency, and safety standpoints. Next, a new family of non-isolated high-voltage-gain dc-dc power electronic converters with unidirectional power flow is introduced. This family of converters benefits from a low voltage stress across its switches. The proposed topologies are versatile as they can be utilized as single-input or double-input power converters. In either case, they draw continuous currents from their sources. Lastly, a bidirectional high-voltage-gain dc-dc power electronic converter is proposed. This converter is comprised of a bidirectional boost converter which feeds a switched-capacitor architecture. The switched-capacitor stage suggested here has several advantages over the existing approaches. For example, it benefits from a higher voltage gain while it uses less number of capacitors. The proposed converters are highly efficient and modular. The operating modes, dc voltage gain, and design procedure for each converter are discussed in details. Hardware prototypes have been developed in the lab. The results obtained from the hardware agree with those of the simulation models.

  14. Violence and health in Colombia

    Directory of Open Access Journals (Sweden)

    Saúl Franco Agudelo

    1997-09-01

    Full Text Available In Colombia, violence seems uncontrollable. Along with massacres and group killings of astonishing cruelty, there are also kidnappings and disappearances, abuse of children and the elderly, and rape of young adolescents. Every day, without respite, Colombians are witnesses or victims of street crimes as well as racial, sexual, and socioeconomic discrimination. Unwillingly, they become agents of aggression in public transport, at home, at school, and at work. Colombia has the highest rates of mortality from homicide in the world. Apart from the enormous institutional burden that violence imposes on the health services and forensic medicine, it now constitutes the principal public health problem in the country. To confront it, the health sector must develop policies and finance actions, develop innovative ways to train personnel, implement public education processes, and devote more effort and greater creativity to research, which up to now has provided some important, albeit insufficient, responses. Violence, which is the substitution of force for any type of dialogue, must be considered within the context of life and health. Doing so is not an attempt to rationalize violence, much less to substitute words or reflection for action, but rather an attempt to understand it in depth in order to search for alternatives. With that goal, this article analyzes the subject of violence in Colombia, principally from the perspective of its effect on the health of the citizens and its implications for the health sector. The author fully recognizes the subjectivity and limitations of the views he expresses herein.

  15. ECONOMIA POLITICA DEL PLAN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Jesús Martínez Betancourt

    2000-05-01

    Full Text Available 1. El Plan Colombia, una política imperialista. El verdadero plan de desarrollo de Colombia no es el que aprobó el Congreso de la República en octubre del año pasado, sino el que se deriva de los acuerdos sobre créditos y “ayudas” del Gobierno del Dr. Pastrana con el Fondo Monetario Internacional, con el Banco Interamericano de Desarrollo y especialmente con el Gobierno de los Estados Unidos, ya conocido como Plan Colombia. Una de las características del imperialismo, formuladas por V. I. Lenin en su libro “El imperialismo fase superior del capitalismo”, de vigencia en este mundo globalizado por la hegemonía ultraimperialista, es que simultáneamente con el reparto económico del mundo se hace el reparto territorial, para afianzar el dominio económico, cultural y político. El reparto territorial fundamentado en las pretensiones económicas, por las fuentes de materias primas y alimentos y/o por mercados para vender los productos de las metrópolis, generalmente se ha hecho por la vía bélica, como las dos guerras mundiales del siglo XX, o las regionales, como la del Golfo Pérsico, entre otras.

  16. Caracterización de la gestión de residuos hospitalarios y similares en cami vista hermosa, Bogota

    Directory of Open Access Journals (Sweden)

    Juan Carlos Hernández-Criado

    2016-01-01

    Full Text Available Background. The environmental management of residues is defined within the public policy, which involves the hazardous waste from a general standpoint. Only until 2000, the mandatory guidelines were established for the comprehensive management of hospital waste and similar in Colombia. Objective. To characterize the management of hospitaland similar waste in CAMI VISTA HERMOSA, Bogotá. Methods. Research was performed at the first level healthcare provider CAMI VISTA HERMOSA, a public social company. A cross – section type study was performed, where the daily-base generated waste was characterized qualitatively and quantitatively, through the consolidation of the information in the RH1 form, established by the Manual for the Comprehensive Management of Hospital Solid Waste and Similar. Results. Biosanitary, sharps, drug, heavy metal, ordinary, recyclable and anatomic-pathological wastes were identified by using the RH1 form; similarly, they were quantified in each of the areas involved in the service providing process, showing the fluctuation in the behavior related to weights and each of their classes, determined by several factors including: the increasing number of medical appointments regarding respiratory diseases associated with raining seasons and the inappropriate waste disposal in different areas. Conclusions. Data collection was a tool that allowed to identify critical points such as the inappropriate waste disposal. Besides, the information was useful as a strategy to reorganize processes of change according to the Plan of Management of Hospital Waste and Similar.

  17. 50 Years of the Aesthetic Research Institute, Nowadays Carlos Arbelaez Camacho Institute for the architectural and urban heritage in Bogota

    Directory of Open Access Journals (Sweden)

    Olimpia Niglio

    2014-01-01

    Full Text Available Con los primeros 50 años del Instituto de Investigaciones Estéticas, hoy Instituto Carlos Arbeláez Camacho para el patrimonio arquitectónico y urbano en Bogotá, este artículo tiene como finalidad recorrer las etapas fundamentales del desarrollo de la cultura de la restauración en Colombia gracias a la obra del profesor Carlos Arbeláez Camacho.Su obra se desarolló en un contexto cultural muy complejo donde la práctica de la conservación del patrimonio cultural no era de interés para la comunidad más interesada a la modernización del país. Sin embargo el trabajo de sensibilización desarrollado por Carlos Arbeláez Camacho con sus alumnos ha puesto las bases por una cultura de la restauración, hoy con más de cincuenta años de historia y de experiencias muy interesantes. 

  18. Drilling history core hole DC-8

    Energy Technology Data Exchange (ETDEWEB)

    1978-10-01

    Core hole DC-8 was completed in August, 1978 by Boyles Brothers Drilling Company, Spokane, Washington, under subcontract to Fenix and Scission, Inc. The hole was cored for the US Department of Energy and the Rockwell Hanford Operations' Basalt Waste Isolation Program. Fenix and Scisson, Inc. furnished the engineering, daily supervision of the core drilling activities, and geologic core logging for hole DC-8. Core hole DC-8 is located on the Hanford Site near the Wye Barricade and 50 feet northwest of rotary hole DC-7. The Hanford Site vation coordinates for DC-8 are North 14,955.94 feet and West 14,861.92 coordinates for DC-8 are North 14,955.94 feet and West 14,861.92 mean sea level. The purpose of core hole DC-8 was to core drill vertically through the basalt and interbed units for stratigraphic depth determination and core collection, and to provide a borehole for hydrologic testing and cross-hole seismic shear and pressure wave velocity studies with rotary hole DC-7. The total depth of core hole DC-8 was 4100.5 feet. Core recovery exceeded 97 percent of the total footage cored.

  19. Teaching about operation of brushless DC motors

    OpenAIRE

    Čufar, Aleksandra

    2013-01-01

    Brush DC motor is being replaced by brushless DC motors on every area of application. My diploma thesis is a presentation of brushless DC motor, how it works and its application. Within first part we describe various electric motors and their application. There are several types of electric motors division. Last to be added is a brushless motor. Within second part of thesis we look into a brushless DC motor, how it works, its application and control. In the third part of thesis we construct a...

  20. Drilling history core hole DC-8

    International Nuclear Information System (INIS)

    1978-10-01

    Core hole DC-8 was completed in August, 1978 by Boyles Brothers Drilling Company, Spokane, Washington, under subcontract to Fenix and Scission, Inc. The hole was cored for the US Department of Energy and the Rockwell Hanford Operations' Basalt Waste Isolation Program. Fenix and Scisson, Inc. furnished the engineering, daily supervision of the core drilling activities, and geologic core logging for hole DC-8. Core hole DC-8 is located on the Hanford Site near the Wye Barricade and 50 feet northwest of rotary hole DC-7. The Hanford Site vation coordinates for DC-8 are North 14,955.94 feet and West 14,861.92 coordinates for DC-8 are North 14,955.94 feet and West 14,861.92 mean sea level. The purpose of core hole DC-8 was to core drill vertically through the basalt and interbed units for stratigraphic depth determination and core collection, and to provide a borehole for hydrologic testing and cross-hole seismic shear and pressure wave velocity studies with rotary hole DC-7. The total depth of core hole DC-8 was 4100.5 feet. Core recovery exceeded 97 percent of the total footage cored

  1. Simultaneous distribution of AC and DC power

    Science.gov (United States)

    Polese, Luigi Gentile

    2015-09-15

    A system and method for the transport and distribution of both AC (alternating current) power and DC (direct current) power over wiring infrastructure normally used for distributing AC power only, for example, residential and/or commercial buildings' electrical wires is disclosed and taught. The system and method permits the combining of AC and DC power sources and the simultaneous distribution of the resulting power over the same wiring. At the utilization site a complementary device permits the separation of the DC power from the AC power and their reconstruction, for use in conventional AC-only and DC-only devices.

  2. Sexual and reproductive health for young adults in Colombia: teleconsultation using mobile devices.

    Science.gov (United States)

    Lopez, Catalina; Ramirez, Daniel Camilo; Valenzuela, Jose Ignacio; Arguello, Arturo; Saenz, Juan Pablo; Trujillo, Stephanie; Correal, Dario Ernesto; Fajardo, Roosevelt; Dominguez, Cristina

    2014-09-25

    Sexual risk behaviors associated with poor information on sexuality have contributed to major public health problems in the area of sexual and reproductive health in teenagers and young adults in Colombia. To report our experience with the use of DoctorChat Mobile to provide sexual education and information among university students in Bogota, Colombia, and knowledge about the sexual risk factors detected among them. A mobile app that allows patients to ask about sexual and reproductive health issues was developed. Sexual and reproductive risk behaviors in a sample of young adults were measured before and after the use of the app through the validated survey Family Health International (FHI) Behavioral Surveillance Survey (BSS) for Use With Adults Between 15 and 49 Years. A nonprobabilistic convenience recruitment was undertaken through the study´s webpage. After completing the first survey, participants were allowed to download and use the app for a 6-month period (intervention), followed by completion of the same survey once again. For the inferential analysis, data was divided into 3 groups (dichotomous data, discrete quantitative data, and ordinal data) to compare the results of the questions between the first and the second survey. The study was carried out with a sample of university students between 18 and 29 years with access to mobile phones. Participation in the study was voluntary and anonymous. A total of 257 subjects met the selection criteria. The preintervention survey was answered by 232 subjects, and 127 of them fully answered the postintervention survey. In total, 54.3% (69/127) of the subjects completed the survey but did not use the app, leaving an effective population of 58 subjects for analysis. Of these subjects, 53% (31/58) were women and 47% (27/58) were men. The mean age was 21 years, ranging between 18 and 29 years. The differences between the answers from both surveys were not statistically significant. The main sexual risk behaviors

  3. DIAGNOSTIC/PROGNOSTIC EXPERIMENTS FOR CAPACITOR DEGRADATION AND HEALTH MONITORING IN DC-DC CONVERTERS

    Data.gov (United States)

    National Aeronautics and Space Administration — Studying and analyzing the ageing mechanisms of electronic components avionics in systems such as the GPS and INAV are of critical importance. In DC-DC power...

  4. Modular Power System Configured with Standard Product Hybrid DC-DC Converters, Phase II

    Data.gov (United States)

    National Aeronautics and Space Administration — VPT proposes an innovative concept whereby complex NASA space power electronic systems can be configured using a small number of qualified hybrid DC-DC converter and...

  5. Decentralized Nonlinear Controller Based SiC Parallel DC-DC Converter, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — This proposal is aimed at demonstrating the feasibility of a Decentralized Control based SiC Parallel DC-DC Converter Unit (DDCU) with targeted application for...

  6. Digitally intensive DC-DC converter for extreme space environments, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — The Space Micro –Arizona State University (ASU) team will develop an all-digitally controlled, wide temperature range point-of-load switch-mode DC-DC regulator core...

  7. Digitally intensive DC-DC converter for extreme space environments, Phase II

    Data.gov (United States)

    National Aeronautics and Space Administration — The Space Micro-Arizona State University (ASU) team will develop an all-digitally controlled, wide temperature range point-of-load switch-mode DC-DC regulator core...

  8. Wide Temperature Range DC-DC Boost Converters for Command/Control/Drive Electronics, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — We shall develop wide temperature range DC-DC boost converters that can be fabricated using commercial CMOS foundries. The boost converters will increase the low...

  9. Bidirectional DC-DC conversion device use at system of urban electric transport

    Science.gov (United States)

    Vilberger, M. E.; Vislogusov, D. P.; Kotin, D. A.; Kulekina, A. V.

    2017-10-01

    The paper considers questions of energy storage devices used in electric transport, especially in the electric traction drive of a trolley bus, in order to provide an autonomous motion, overhead system’s load leveling and energy recovering. For efficiency of the proposed system, a bidirectional DC-DC converter is used. During the simulation, regulation characteristics of the bidirectional DC-DC converters were obtained.

  10. Regulation of DC development and DC-mediated T-cell immunity via CISH

    OpenAIRE

    Miah, Mohammad Alam; Bae, Yong-Soo

    2013-01-01

    Cytokine inducible SH2-containing protein (CISH) plays a crucial role in type 1 dendritic cell (DC) development as well as in the DC-mediated activation of cytotoxic T lymphocytes (CTLs). CISH expression at late DC developmental stages shuts down the proliferation of DC progenitors by negatively regulating signal transducer and activator of transcription 5 (STAT5) and facilitates the differentiation of DCs into potent stimulators of CTLs.

  11. Regulation of DC development and DC-mediated T-cell immunity via CISH.

    Science.gov (United States)

    Miah, Mohammad Alam; Bae, Yong-Soo

    2013-03-01

    Cytokine inducible SH2-containing protein (CISH) plays a crucial role in type 1 dendritic cell (DC) development as well as in the DC-mediated activation of cytotoxic T lymphocytes (CTLs). CISH expression at late DC developmental stages shuts down the proliferation of DC progenitors by negatively regulating signal transducer and activator of transcription 5 (STAT5) and facilitates the differentiation of DCs into potent stimulators of CTLs.

  12. High voltage DC power supply

    Science.gov (United States)

    Droege, Thomas F.

    1989-01-01

    A high voltage DC power supply having a first series resistor at the output for limiting current in the event of a short-circuited output, a second series resistor for sensing the magnitude of output current, and a voltage divider circuit for providing a source of feedback voltage for use in voltage regulation is disclosed. The voltage divider circuit is coupled to the second series resistor so as to compensate the feedback voltage for a voltage drop across the first series resistor. The power supply also includes a pulse-width modulated control circuit, having dual clock signals, which is responsive to both the feedback voltage and a command voltage, and also includes voltage and current measuring circuits responsive to the feedback voltage and the voltage developed across the second series resistor respectively.

  13. A Dual-Buck–Boost AC/DC Converter for DC Nanogrid With Three Terminal Outputs

    DEFF Research Database (Denmark)

    Wu, Weimin; Wang, Houqing; Liu, Yuan

    2017-01-01

    Due to the widely used dc characterized loads and more distributed power generation sources, the dc nanogrid becomes more and more popular, and it is seen as an alternative to the ac grid. For safety considerations, the dc nanogrid should provide reliable grounding for the residential loads...

  14. Fuzzy Logic Controlled DC-DC Converter Based Dynamic Voltage Restorer

    Directory of Open Access Journals (Sweden)

    Mustafa İnci

    2015-12-01

    Full Text Available This paper presents fuzzy logic controlled dc-dc boost converter based Dynamic Voltage Restorer (DVR to compensate severe voltage sag problems in an electrical system. DVR absorbs real power from battery to compensate voltage sags in the system. This condition causes reduction in voltage magnitude of dc-link capacitor. Additionally, DVR requires large dc capacitors to compensate long and severe voltage sags in the system. In this study, dc-dc boost converter is connected to DVR for keeping dc link voltage constant. For this propose, a control algorithm based on Fuzzy Logic (FL control is developed for dc-dc boost converter. The main contribution of this study is that Fuzzy Logic (FL is firstly used to generate reference signal for PWM signals of dc-dc converter applied in DVR. FL is a very flexible controller which keeps the dc link voltage constant during voltage sag. The performance results of proposed study are verified with PSCAD/EMDTC.

  15. Extra-High-Voltage DC-DC Boost Converters Topology with Simple Control Strategy

    Directory of Open Access Journals (Sweden)

    P. Sanjeevikumar

    2008-01-01

    Full Text Available This paper presents the topology of operating DC-DC buck converter in boost mode for extra-high-voltage applications. Traditional DC-DC boost converters are used in high-voltage applications, but they are not economical due to the limited output voltage, efficiency and they require two sensors with complex control algorithm. Moreover, due to the effect of parasitic elements the output voltage and power transfer efficiency of DC-DC converters are limited. These limitations are overcome by using the voltage lift technique, opens a good way to improve the performance characteristics of DC-DC converter. The technique is applied to DC-DC converter and a simplified control algorithm in this paper. The performance of the controller is studied for both line and load disturbances. These converters perform positive DC-DC voltage increasing conversion with high power density, high efficiency, low cost in simple structure, small ripples, and wide range of control. Simulation results along theoretical analysis are provided to verify its performance.

  16. Plan Colombia or development as security

    Directory of Open Access Journals (Sweden)

    Juan Pablo Guevara Latorre

    2015-01-01

    the most relevant policy for the construction of the State in 21st-century Colombia from a critical standpoint. The document makes it possible to show that Plan Colombia is a privatized form of development, interpreted in terms of security based on an incomplete understanding of the Colombian conflict that prevails into our present

  17. Barriers to Combating Human Trafficking in Colombia

    Science.gov (United States)

    2015-03-01

    Migraciones , 2011), 46, http://www.oim.org.co/trata-de-personas/1522-trata-de-personas-en-colombia-una- aproximacion-a-la-magnitud-y-comprension-del... Migraciones , 2011. http://www.oim.org.co/trata-de-personas/1522-trata-de- personas-en-colombia-una-aproximacion-a-la-magnitud-y-comprension-del

  18. Modelling of flow phenomena during DC casting

    NARCIS (Netherlands)

    Zuidema, J.

    2005-01-01

    Modelling of Flow Phenomena during DC Casting Jan Zuidema The production of aluminium ingots, by semi-continuous casting, is a complex process. DC Casting stands for direct chill casting. During this process liquid aluminium transforms to solid aluminium while cooling down. This is not an

  19. Dual wound dc brush motor gearhead

    Science.gov (United States)

    Henson, Barrie W.

    1986-01-01

    The design requirements, the design, development tests and problems, the qualification and life test and the findings of the strip examination of a dual wound DC brushed motor gearhead are described. It is the only space qualified dual wound dc brushed motor gearhead in Europe.

  20. Pulsed-DC DBD Plasma Actuators

    Science.gov (United States)

    Duong, Alan; Corke, Thomas; Thomas, Flint

    2017-11-01

    A power system for dielectric barrier discharge (DBD) plasma actuators that utilizes a pulsed-DC waveform is presented. The plasma actuator arrangement is identical to most typical AC-DBD designs with staggered electrodes that are separated by a dielectric insulator. A key difference is that the pulsed-DC actuator utilizes a DC voltage source to drive the actuator instead of an AC voltage input. The DC source is supplied to both electrodes. The exposed electrode remains constant in time while the encapsulated electrode is periodically grounded for short instances then is allowed to rise to the source DC level. Further investigation of the pulsed-DC plasma actuator was conducted. Time-resolved velocity measurements were done to characterize the induced velocity field generated by the pulsed-DC plasma actuator. A model of the pulsed-DC plasma actuator is developed in LTspice for further study. The work presented are intended in developing a model to be used in CFD flow control simulations. NASA SBIR NNX14CC12C.

  1. Electronic DC transformer with high power density

    NARCIS (Netherlands)

    Pavlovský, M.

    2006-01-01

    This thesis is concerned with the possibilities of increasing the power density of high-power dc-dc converters with galvanic isolation. Three cornerstones for reaching high power densities are identified as: size reduction of passive components, reduction of losses particularly in active components

  2. Analysis of a Hybrid DC Comparator

    Directory of Open Access Journals (Sweden)

    Li Web

    2006-06-01

    Full Text Available The traditional controllable saturation reactor (CSR consists of single toroidal core, DC (direct current controlled loop (including DC controlled winding and DC biasing source and AC (alternating current excitation loop (including excitation winding and AC source. A detection winding and secondary winding are added up to the CSR configuration and form a hybrid DC comparator. The excitation current is asymmetric waveform when the CSR core is commonly stimulated by both AC and DC biasing sources, which just is the fundamental characteristic for the proposed comparator. Research shows the terminal voltage of the detection winding is asymmetric waveform when the secondary winding of the comparator is open and the CSR core is stimulated both by AC and DC biasing sources. Both theory analysis and experiment verify the feasibility of the differential RMS (root-mean-square between positive and negative half waves of the terminal voltage from the detection winding fitting for the feedback variance to balance DC biasing magnetic potential and form a self-balancing comparator. The zero-flux technique that the primary ampere-turn is equal to the secondary is the function base for the comparator. The operation details of the comparator including the control characteristics both of open-loop and close loop, the satiability judgment criterion, static error property and test range are introduced. The experimental results testify to the truth of the principle of the proposed DC comparator.

  3. DC/DC converters for integration of double-layer condensers in onboard power supply; DC/DC-Wandler zur Einbindung von Doppelschichtkondensatoren in das Fahrzeugenergiebordnetz

    Energy Technology Data Exchange (ETDEWEB)

    Polenov, Dieter

    2010-01-15

    The paper discusses DC/DC converters for integration of double layer condensers into the onboard power system. First, requirements on DC/DC converters are listed and compared on the basis of three exemplary applications. A DC/DC converter concept is developed for decoupling transient high-power loads like electric steering systems. Three different topologies are compared using a specially developed method in order to find the best solution for the given application. In order to establish adequate criteria for selecting the switching frequency and inductivities of storage throttles, the influence of the trottle power change on the switching characteristics of the MOSFETs and on certain ranges of EMP interference emissions is investigated. As methods of optimising the operation of the synchronous rectifiers, parallel connection of Schottky diodes and synchronous rectifiers as well as the variation of the shut-off dead times of synchronous rectifiers were investigated. Further, a concept for converter control was developed in consideration of the intended application and topology. Finally, selected aspects for implementation of the DC/DC converter concept are presented as well as the results of experimental investigations.

  4. DC-based magnetic field controller

    Science.gov (United States)

    Kotter, Dale K.; Rankin, Richard A.; Morgan, John P,.

    1994-01-01

    A magnetic field controller for laboratory devices and in particular to dc operated magnetic field controllers for mass spectrometers, comprising a dc power supply in combination with improvements to a hall probe subsystem, display subsystem, preamplifier, field control subsystem, and an output stage.

  5. 75 FR 61989 - Airworthiness Directives; McDonnell Douglas Corporation Model DC-8-31, DC-8-32, DC-8-33, DC-8-41...

    Science.gov (United States)

    2010-10-07

    ... 125 airplanes of the affected design in the worldwide fleet. The following table provides the... 30-1 ``DC-8 Pneumatic System Decay Check'' in Appendix C of Boeing DC-8 Special Compliance Item... contained in Table 1 of this AD to do the actions required by this AD, unless the AD specifies otherwise...

  6. DC KIDS COUNT e-Databook Indicators

    Science.gov (United States)

    DC Action for Children, 2012

    2012-01-01

    This report presents indicators that are included in DC Action for Children's 2012 KIDS COUNT e-databook, their definitions and sources and the rationale for their selection. The indicators for DC KIDS COUNT represent a mix of traditional KIDS COUNT indicators of child well-being, such as the number of children living in poverty, and indicators of…

  7. Hierarchical Power Sharing Control in DC Microgrids

    DEFF Research Database (Denmark)

    Peyghami, Saeed; Mokhtari, Hossein; Blaabjerg, Frede

    2016-01-01

    Because of the advances in power electronics, DC-based power systems, have been used in industrial applications such as data centers [18], space applications [10], aircraft [12], offshore wind farms, electric vehicles [56], DC home systems [5, 20], and high-voltage DC transmission systems....... To provide such sensitive loads with more reliability, efficiency, and controllability for future power systems, AC microgrid and more recently DC microgrid and smart-grid technologies have been employed [ , , , and ]. To obtain stable and optimal operation in DC power systems (microgrids), proper load...... sharing among different energy units and acceptable voltage regulation across the microgrid is required. This can be achieved by use of a hierarchical power management structure. The highest level in this hierarchy (tertiary) is responsible for the power flow control between the microgrid and the utility...

  8. DC Voltage Droop Control Implementation in the AC/DC Power Flow Algorithm: Combinational Approach

    DEFF Research Database (Denmark)

    Akhter, F.; Macpherson, D.E.; Harrison, G.P.

    2015-01-01

    of operational flexibility, as more than one VSC station controls the DC link voltage of the MTDC system. This model enables the study of the effects of DC droop control on the power flows of the combined AC/DC system for steady state studies after VSC station outages or transient conditions without needing...... to use its complete dynamic model. Further, the proposed approach can be extended to include multiple AC and DC grids for combined AC/DC power flow analysis. The algorithm is implemented by modifying the MATPOWER based MATACDC program and the results shows that the algorithm works efficiently....

  9. The south territory; the city limits as recognition in new ways of urban-regional growth between Bogota and the Municipality of Soacha

    International Nuclear Information System (INIS)

    Acebedo R, Luis Fernando

    2002-01-01

    The purpose of this paper is to study the context of the great urban developments occurring in the south of Bogota and Soacha, as two towns that form an extremely complex urban, continuum, emerging from the spread of residential areas and diverse productive activities, during five decades. The Tunjuelito River basin-being part of the Savanna's main ecological structure became the foundation for these settlements. To acknowledge the process of urban expansion, taking the river as a natural borderline, allowed us to identify certain social and functionally homogeneous areas that we named the South Territory. Advances in the understanding of the of Colombian cities we the passing and coming into operation of the first generation of the territorial ordering plans, have allowed us to identify, at least, two shortcomings. The first one has to do with an inherent weakness in regional analyses, which to the present day has hindered progress towards a rational distribution of metropolitan territories; the second one has to do with the lack of adequate tools to interpret the so-called peripheral spaces; spaces which, actually, constitute a complex urban and rural system having extraordinary regional impact. The study of the South Territory helps to prove the truth of this hypothesis and suggests new interpretations and ways to approach the problem

  10. [Respiratory disease risk factors in the 5-14 year-old population in an area of Bogota, 2012-2013].

    Science.gov (United States)

    Rodríguez-Moreno, Natalia; Martínez-Morales, Viviana; Sarmiento-Suarez, Rodrigo; Medina-Palacios, Katalina; Hernández, Luis J

    2013-01-01

    Establishing the prevalence of respiratory symptoms, asthma and rhinitis, possibly associated with air pollution, in 5- to 14-year-old children in Bosa (a conurbation of Bogota), between 2012 and 2013. A sample was taken of 553 children living in the conurbation. The results indicated that when a child lives with people who smoke there was a 1.5 times risk of coughing at night (compared to living in a non-smoking home) such night-time coughing being different to that produced by respiratory infections such as colds, bronchitis and pneumonia. Children living in homes having fireplaces/open cooking areas located less than 100 m apart had 1.6 times greater probability of presenting symptoms. Children attending schools having greater PM10 exposure and living near buildings being constructed or having roads in a poor state of repair less than 100 meters from their homes were 2.5 times more likely to suffer respiratory disease. Children living in damp rooms were 4 times more likely to have wheezed during the past year. The risk of wheezing became increased by 80 % when a child lived within 100 meters of buildings being constructed or near unpaved roads and attended a school having greater exposure. Government intervention is critical for changing respiratory disease-associated extramural risk factors, such as improvements benefitting children which should be carried out in urban areas.

  11. Enfermedad de Chagas en Colombia

    Directory of Open Access Journals (Sweden)

    Fernando Serpa Florez

    1985-12-01

    Full Text Available

    Generalidades.

    La tripanosomiasis americana o enfermedad de Chagas se halla ampliamente distribuida en Centro y Sur América. La Organización Mundial de la Salud considera que pueden haber doce millones de casos de esta dolencia en el continente (1, estudiados principalmente en Argentina, Brasil y Venezuela. Se calcula que en Colombia tendríamos una incidencia muy alta de casos, (Marinkelle (2 estima que 7.140/0 de la población podría estar infectada o sea cerca de dos millones de personas, distribuidos en las zonas rurales del nordeste del país (cuenca del Catatumbo Magdalena Medio y Llanos Orientales (Piedemonte, Macarena y Meta cercano (3 (4 (5 Y que seis millones de nuestros compatriotas -22.30/0 de la población total- (2 corren el riesgo de adquirir la enfermedad pues habitan en regiones donde se dan las condiciones para que ésta se propague.


    RESEÑA HISTORICA DE LA ENFERMEDAD EN COLOMBIA
    La existencia de casos de tripanosomiasis americana y de sus vectores fue comprobada en Colombia desde 1929 cuando César Uribe Piedrahita (6 encontró en Prado, Tolima, vectores del mal infectados con T.

    cruzi e Ignacio Moreno Pérez observó dicho hemoflagelado en sangre de seres humanos en Cali (4. En los años siguientes Hernando Ucrós, Benjamín Otálora, Hernando Groot, Santiago Renjifo, Hernando Osorno, Carlos Duarte Rangel, C.J. Marinkelle, Augusto Corredor, Ernesto Suescún y varios otros investigadores colomb iano s describieron diversos focos de la enfermedad en Colombia y estudiaron la distribución de sus vectores y huéspedes intermediarios. En 1947 1. Caicedo y C. Hernández publicaron su informe sobre los primeros casos crónicos de enfermedad de Chagas comprobados en nuestro país, procedentes de la región de Fusagasugá, Cundinamarca (7 en tanto que, en 1961, Marcos Duque inicia los estudios sobre cardiopatía chagásica (8 y Hernando Rocha, en 1971, comunica

  12. Helmintiasis y protozoasis en colombia

    OpenAIRE

    Patiño Camargo, Luis

    2011-01-01

    Sabre un territorio de más de un millón de kilómetres cuadrados caracrerizado por la multiplicidad de climas y la variedad topográfica de su relieve, habita el pueblo de Colombia de cerca de nueve millones de personas de un tipo humano con caracteres propios en via de eetabilización. El parasitismo intestinal por helmintos y protozoarios es una pandemia de todos los climas colombianos, pera alcanza su intensidad maxima en las zonas extendidas del nivel del mar a 2.000 metros de elevación con ...

  13. MICROCRÉDITO EN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Bernardo Barona Z

    2004-01-01

    Full Text Available El artículo tiene como propósitos: proporcionar una visión general de la forma en que el financiamiento de los microempresarios y los estratos más vulnerables de la población ha sido abocada en Colombia; resumir los grandes retos que enfrenta en la actualidad el programa de microfinanzas en el mundo, presentar el programa de investigación que están adelantando las Universidades Icesi y del Valle en Colombia en asocio con la Universidad de Laval en Canadá y con algunos centros de Investigación de Filipinas, Marruecos y Benin y algunos resultados parciales de este esfuerzo investigativo; y, presentar algunas recomendaciones tendientes a fortalecer a las organizaciones microfinancieras en el país. Una revisión de la historia y el estado actual del microcrédito en Colombia indica que los esfuerzos hasta ahora realizados parecen haberse quedado muy cortos frente a las necesidades de financiación de los microempresarios: la cobertura de microemepresarios alcanzada por instituciones gubernamentales, ONG y la banca convencional ha sido muy baja. En cuanto a los retos que afronta el movimiento microfinanciero en el mundo dos muy importantes son (i, clarificar el efecto de los diferentes esfuerzos de microcrédito realizados en la reducción de la pobreza de la población del país y, (ii, identificar mecanismos para lograr un aumento significativo de la cobertura mediante un balance adecuado entre regulación, supervisión y disciplina de mercado. Los principales resultados (parciales obtenidos en la línea de investigación descrita en este artículo son (i, contrario a lo que con frecuencia se asume, a medida que una organización cooperativa crece en tamaño no necesariamente se torna más eficiente: los posibles beneficios de la mayor escala fueron más que compensados en las empresas estudiadas por nosotros por la propensión al gasto excesivo que exhiben los gerentes en caso de instituciones de mayor tamaño (ii, las cooperativas

  14. La industria maltera en Colombia

    Directory of Open Access Journals (Sweden)

    Bernardo Parra Restrepo

    2002-06-01

    Full Text Available Este artículo estudia la industria maltera de Colombia, su origen, evolución y el estado en que se encuentra. Presenta cifras respecto al comportamiento de la producción y ventas. Muestra las relaciones de propiedad y describe la importancia relativa de la empresa con las otras subsidiarias del grupo económico al que pertenece. De otra parte analiza las relaciones obrero/patronales en el contexto actual y las relaciones con la agroindustria colombiana.

  15. Los desequilibrios territoriales en Colombia

    OpenAIRE

    Alfonso Roa, Óscar A.; A. Alfonso R., Óscar; Revéiz Roldán, Édgar

    2016-01-01

    Colombia es un país de regiones metropolitanas. Si a cada región que es habitada por una población le es inmanente un gobierno, las formas de ocupación territorial por la población y las actividades humanas deberían contar con la forma de gobierno más pertinente. Por tanto, un nuevo modelo territorial de Estado tendrá que organizarse en torno a gobiernos metropolitanos cuyas funciones de alcance supralocal se construirían con base en las que ya poseen las jurisdicciones involucradas en el pol...

  16. Food Innocuousness: Prospect In Colombia

    Directory of Open Access Journals (Sweden)

    Ana Elvira Ortiz Amaya

    2011-12-01

    Full Text Available Food innocuousness, on all over the world, is receiving more attention due to the increment in the incidence of food borne diseases (ETAs, the worry about emergent known dangers and the globalization of trade. Consequently, this literature review shows the progress in relation to this thematic, in Colombia. It covers topics as the relation between food innocuousness and safety, the international and national organizations involved, the developments, in legislation, the system of epidemiological surveillance of ETAs and their perspectives, as cornerstones to ensure food quality

  17. La seguridad social en Colombia

    OpenAIRE

    Roa Vanegas, Katherine

    2014-01-01

    Artículo de reflexión como (requisito para optar el título de Contador Público).-- Universidad de San Buenaventura, Facultad de Ciencias Administrativas y Contables, Programa de Contaduría Pública, 2014 Este artículo, aborda el tema de La seguridad Social laboral en Colombia, con el objetivo principal de que los administradores de empresa, los gerentes del departamento de recursos humanos y en especial los colaboradores de las diferentes compañías ubicadas a lo largo y ancho del territorio...

  18. Banca y Region en Colombia

    Directory of Open Access Journals (Sweden)

    Juan Santiago Correa

    2009-06-01

    Full Text Available Este artículo analiza el desarrollo del sistema monetario y bancario de Colombia entre 1850 y 1880. El debate político y la lucha de poder entre las élites regionales, y entre los grupos políticos en el ámbito nacional, configuraron el modelo económico de la época. Más allá de su viabilidad técnica, las decisiones económicas estuvieron asociadas a la visión de nación que cada grupo de poder quería imponer a los demás.

  19. Military Civic Action in Colombia

    Science.gov (United States)

    1985-08-01

    gamonales, y campesinos: El caso de la violencia en Colombia (Bogotd: El Ancora Editores, 1983), p. 199. Guz~n, Fals Borda, and Umaha Luna, La violencia , p...p. 73. 49Octava Brigada, De la violencia a la paz (Manizales: Imprenta Departamental de Caldas, 1965), p. 17. 103 50Ramsey, "Violence," pp. 423-242...Review 43 (July 1963): 20-25. Octava Brigada. De la violencia a la paz . Manizales: Imprenta Departamental de Caldas, 1965. 123 O’Meara, Andrew P

  20. DC-10 winglet flight evaluation

    Science.gov (United States)

    Taylor, A. B.

    1983-01-01

    Results of a flight evaluation of winglets on a DC-10 Series 10 aircraft are presented. For sensitive areas of comparison, effects of winglets were determined back-to-back with and without winglets. Basic and reduced-span winglet configurations were tested. After initial encounter with low-speed buffet, a number of acceptable configurations were developed. For maximum drag reduction at both cruise and low speeds, lower winglets were required, having leading edge devices on upper and lower winglets for the latter regime. The cruise benefits were enhanced by adding outboard aileron droop to the reduced-span winglet aircraft. Winglets had no significant impact on stall speeds, high-speed buffet boundary, and stability and control. Flutter test results agreed with predictions and ground vibration data. Flight loads measurement, provided in a concurrent program, also agreed with predictions. It was estimated that a production version of the aircraft, using the reduced-span winglet and aileron droop, would yield a 3-percent reduction in fuel burned with capacity payload. This range was 2% greater than with winglets. A 5% reduction in takeoff distance at maximum takeoff weight would also result.

  1. The effect of dementia patient's physical, cognitive, and emotional/ behavioral problems on caregiver well-being: findings from a Spanish-speaking sample from Colombia, South America.

    Science.gov (United States)

    Arango Lasprilla, Juan Carlos; Moreno, Alexander; Rogers, Heather; Francis, Kathryn

    2009-01-01

    The current study aims to (1) determine whether there is a relationship between the problems of patients with dementia and the psychosocial functioning of the caregiver, (2) determine whether these relationships exist independent of sociodemographic and caregiving-related variables, and (3) determine which type of problems of patients with dementia best predict the psychosocial functioning of the caregiver. In all, 73 family caregivers were recruited from Bogota, Colombia. The caregivers completed a checklist of problems presented by the person with dementia, Patient Health Questionnaire (PHQ-9), Zarit Burden Interview (ZBI), Interpersonal Support Evaluation List (ISEL-12), and Satisfaction with Life Scale (SWLS). Number of cognitive and behavioral/emotional problems presented by the person with dementia was positively correlated with caregiver PHQ-9 and ZBI scores. Number of behavioral/emotional problems was negatively correlated with ISEL-12 scores. Cognitive and behavioral/emotional problems, but not physical, presented by the person with dementia were associated with higher levels of depression and burden of caregiver. Behavioral/emotional difficulties were associated with lower caregiver-perceived social support rating.

  2. ConstitutionalJustice: Cases of Protection of Freedom and Personal Security in Colombia

    Directory of Open Access Journals (Sweden)

    Viridiana Molinares Hassan

    2014-07-01

    Full Text Available In this paper we present the results of an investigation about judicial protection of freedom and personal security granted by the Constitutional Court (cc of Colombia, with a comparative analysis between the period 1992-2001, to which governments have appointed period of postconstitucionales, which coincides with the issuance of the 1991 Constitution, and the creation of constitutional jurisdiction, and the period 2002-2010, during which it ran the Democratic Security Policy (dsp as a government policy proposal by former president Álvaro Uribe, whose aim was to achieve peace through the declaration of war to the guerrilla group Revolutionary Armed Forces of Colombia (farc. Our interest is to show that the protection of freedom and personal security as the basis of the Constitutional (ec finds in the cc his greatest guarantor, even against closing courts in other jurisdictions that are still rooted in the failed legal positivist paradigm, ignoring the postulates of neoconstitutionalism dc sufficiently developed from a process of creative interpretation and decision-making. This coupled with the importance for the branches of power and knowledge associated scope of freedom and personal security developed by the cc in the difficult context of irregular warfare that exists in Colombia, yet it is, for universal constitutionalism, an example of the development of legal guarantor in the context of current constitutionalism.

  3. Pulsed-DC selfsputtering of copper

    International Nuclear Information System (INIS)

    Wiatrowski, A; Posadowski, W M; Radzimski, Z J

    2008-01-01

    At standard magnetron sputtering conditions (argon pressure ∼0.5 Pa) inert gas particles are often entrapped in the formed films. Inert gas contamination can be eliminated by using the self-sustained magnetron sputtering process because it is done in the absence of the inert gas atmosphere. The self-sustained sputtering (SSS) gives also a unique condition during the transport of sputtered particles to the substrate. It is especially useful for filling high aspect ratio submicron scale structures for microelectronics. So far it has been shown that the self-sputtering process can be sustained in the DC operation mode (DC-SSS) only. The main disadvantage of DC-SSS process is instability related to possible arc formation. Usage of pulsed sputtering, similarly to reactive pulsed magnetron sputtering, could eliminate this problem. In this paper results of pulsed-DC self-sustained magnetron sputtering (pulsed DC-SSS) of copper are presented for the first time. The planar magnetron equipped with a 50 mm in diameter and 6 mm thick copper target was powered by DC-power supply modulated by power switch. The maximum target power was about 11 kW (∼550W/cm 2 ). The magnetron operation was investigated as a function of pulsing frequency (20-100 kHz) and duty factor (50-90%). The discharge extinction pressure was determined for these conditions. The plasma emission spectra (400-410nm range) and deposition rates were observed for both DC and pulsed DC sustained self-sputtering processes. The presented results illustrate that stable pulsed DC-SSS process can be obtained at pulsing frequency in the range of 60-100 kHz and duty factor of 70-90%

  4. Expression of DC-SIGN and DC-SIGNRs in placentas of HIV-positive patients

    Directory of Open Access Journals (Sweden)

    Komala Pillay

    2014-09-01

    Full Text Available Background. Human dendritic cell-specific intracellular adhesion molecule-3 (ICAM3-grabbing non-integrin (DC-SIGN is a mannose-binding lectin that initiates interaction between dendritic cells and resting T-lymphocytes. DC-SIGN is highly expressed in placental tissue on dendritic cells and Hofbauer cells, and it is suggested that HIV may become adsorbed to DC-SIGN on Hofbauer cells as part of the mechanism of mother-to-child HIV transmission. A possible mechanism of transfer of the virus from the Hofbauer cells to the fetus is the subsequent adsorption to DC-SIGN-related molecules (DC-SIGNRs, present on immediately adjacent capillary vascular endothelium. However, data on DC-SIGN and DC-SIGNR expression in the placenta are few. Methods. Forty term placentas from HIV-positive mothers and 21 term placentas from HIV-negative mothers underwent immunohistochemistry staining for DC-SIGN and DC-SIGNR expression. Five random sets of 10 villi were assessed, and the average number of positive cells were counted in each case. In addition, where possible, maternal and cord blood viral loads and maternal CD4+ counts were performed in the HIV-positive group only. Results. The median maternal CD4+ count was 377 cells/µl and 27% of participants had undetectable viral loads; the median detectable viral load was 3.72 log. Most (97% of the cord bloods tested in infants from HIV-positive mothers had lower than detectable viral loads. HIV-positive cases had significantly greater expression of both DC-SIGNRs (median values in HIV-positive cases, 14.5 positive cells/10 villi (pc/10villi, compared with 11 pc/10villi in HIV-negative cases, p=0.020 and DC-SIGN (median value in HIV-positive cases, 26.5 pc/10villi, compared with 23 pc/10villi in HIV-negative cases, p=0.037. DC-SIGNR expression was also noted in Hofbauer cells and decidual macrophages in addition to endothelium (reported currently. There was no difference in expression of DC-SIGN and DC-SIGNRs in patients

  5. DC-Compensated Current Transformer †

    Science.gov (United States)

    Ripka, Pavel; Draxler, Karel; Styblíková, Renata

    2016-01-01

    Instrument current transformers (CTs) measure AC currents. The DC component in the measured current can saturate the transformer and cause gross error. We use fluxgate detection and digital feedback compensation of the DC flux to suppress the overall error to 0.15%. This concept can be used not only for high-end CTs with a nanocrystalline core, but it also works for low-cost CTs with FeSi cores. The method described here allows simultaneous measurements of the DC current component. PMID:26805830

  6. Road traffic injuries in Colombia.

    Science.gov (United States)

    Rodríguez, Deysi Yasmin; Fernández, Francisco José; Acero Velásquez, Hugo

    2003-01-01

    Road traffic injuries are a leading public health problem in Colombia. Pedestrians are the most vulnerable road users, especially in the main urban centers of Bogotá, Medellin and Cali. Data analyzed in this report include official statistics from the National Police and the National Institute of Legal Medicine and Forensic Sciences for 1996-2000, and results of a study conducted at the National University of Colombia in 2000. Methods from the Highway Capacity Manual were used for determining physical and technical variables, and a Geographical Information System tool was used for the location and spatial analysis of the road traffic crashes. Pedestrians accounted for close to 32% of injuries and 40% of the deaths from road traffic crashes. The problem of road traffic crashes existed predominately in urban areas. In the main urban centers, pedestrians constituted nearly 68% of road traffic crash victims. The high level of risky road use behaviors demonstrated by pedestrians and drivers, and inadequate infrastructure for safe mobility of pedestrians in some sections of the road network were the main contributing factors. Major improvements were achieved in Bogotá following enhancements to the municipal transport system and other policies introduced since 1995. In conclusion, policies and programs for improving road safety, in particular pedestrian safety, and strengthening urban planning are top priority.

  7. EL TLC COLOMBIA-USA

    Directory of Open Access Journals (Sweden)

    Alberto Romero

    2006-07-01

    Full Text Available En el artículo se evalúan los alcances del tratado de libre comercio entre Colombia y los Estados Unidos, a partir del esclarecimiento de lo que representa el mal llamado libre comercio entre la primera potencia económica del mundo y un país atrasado como el nuestro. Con base en la experiencia del TLC entre México y EE.UU. se muestra cómo en la práctica este tratado ha profundizado los desequilibrios estructurales de la economía y la sociedad mexicanas, lo cual es un ejemplo de lo que nos espera a los colombianos. Al analizar el impacto que tendrá el TLC en Colombia, se corrobora cómo este proceso intensificará aún más el carácter apendicular de nuestro desarrollo económico y social dentro de la actual división transnacional del trabajo. Finalmente, se resalta la incapacidad del país para enfrentar exitosamente los retos del TLC, debido a las condiciones socioeconómicas y políticas imperantes.

  8. Transient slab flattening beneath Colombia

    Science.gov (United States)

    Wagner, L. S.; Jaramillo, J. S.; Ramírez-Hoyos, L. F.; Monsalve, G.; Cardona, A.; Becker, T. W.

    2017-07-01

    Subduction of the Nazca and Caribbean Plates beneath northwestern Colombia is seen in two distinct Wadati Benioff Zones, one associated with a flat slab to the north and one associated with normal subduction south of 5.5°N. The normal subduction region is characterized by an active arc, whereas the flat slab region has no known Holocene volcanism. We analyze volcanic patterns over the past 14 Ma to show that in the mid-Miocene a continuous arc extended up to 7°N, indicating normal subduction of the Nazca Plate all along Colombia's Pacific margin. However, by 6 Ma, we find a complete cessation of this arc north of 3°N, indicating the presence of a far more laterally extensive flat slab than at present. Volcanism did not resume between 3°N and 6°N until after 4 Ma, consistent with lateral tearing and resteepening of the southern portion of the Colombian flat slab at that time.

  9. Design and Implementation of Digital Current Mode Controller for DC-DC Converters

    DEFF Research Database (Denmark)

    Taeed, Fazel

    In the recent decades, shortage of fossil fuels and global warming have increased the demand for renewable energy resources. Dc-dc converters are widely used in renewable energy systems, electric vehicles, and battery chargers. In practical applications, dc-dc converters are required to be regula......In the recent decades, shortage of fossil fuels and global warming have increased the demand for renewable energy resources. Dc-dc converters are widely used in renewable energy systems, electric vehicles, and battery chargers. In practical applications, dc-dc converters are required...... to be regulated by a closed-loop controller. The Peak Current Mode Control (PCMC) is one of the most promising control methods for dc-dc converters. It has been known for high bandwidth (speed), and inherent current protection. Increasing the controller bandwidth decreases the output filter size and cost. Analog...... controllers (including PCMC) are sensitive to temperature drift, component aging and noise. Digital controllers do not have the aforementioned drawbacks of analog controllers; but they have lower bandwidth than analog controllers due to the sampling and calculation delays. Generally, analog controllers have...

  10. CISH is induced during DC development and regulates DC-mediated CTL activation.

    Science.gov (United States)

    Miah, Mohammad Alam; Yoon, Cheol-Hee; Kim, Joonoh; Jang, Jinah; Seong, Young-Rim; Bae, Yong-Soo

    2012-01-01

    The cytokine inducible SH2-domain protein (CISH) is a well-known STAT5 target gene, but its role in the immune system remains uncertain. In this study, we found that CISH is predominantly induced during dendritic cell (DC) development from mouse bone marrow (BM) cells and plays a crucial role in type 1 DC development and DC-mediated CTL activation. CISH knockdown reduced the expression of MHC class I, co-stimulatory molecules and pro-inflammatory cytokines in BMDCs. Meanwhile, the DC yield was markedly enhanced by CISH knockdown via cell-cycle activation and reduction of cell apoptosis. Down-regulation of cell proliferation at the later stage of DC development was found to be associated with CISH-mediated negative feedback regulation of STAT5 activation. In T-cell immunity, OT-1 T-cell proliferation was significantly reduced by CISH knockdown in DCs, whereas OT-2 T-cell proliferation was not affected by CISH knockdown. CTLs generated by DC vaccination were also markedly reduced by CISH knockdown, followed by significant impairment of DC-based tumor immunotherapy. Taken together, our data suggest that CISH expression at the later stage of DC development triggers the shutdown of DC progenitor cell proliferation and facilitates DC differentiation into a potent stimulator of CTLs. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  11. Study on the Control Algorithm of Two-Stage DC-DC Converter for Electric Vehicles

    Directory of Open Access Journals (Sweden)

    Changhao Piao

    2014-01-01

    Full Text Available The fast response, high efficiency, and good reliability are very important characteristics to electric vehicles (EVs dc/dc converters. Two-stage dc-dc converter is a kind of dc-dc topologies that can offer those characteristics to EVs. Presently, nonlinear control is an active area of research in the field of the control algorithm of dc-dc converters. However, very few papers research on two-stage converter for EVs. In this paper, a fixed switching frequency sliding mode (FSFSM controller and double-integral sliding mode (DISM controller for two-stage dc-dc converter are proposed. And a conventional linear control (lag is chosen as the comparison. The performances of the proposed FSFSM controller are compared with those obtained by the lag controller. In consequence, the satisfactory simulation and experiment results show that the FSFSM controller is capable of offering good large-signal operations with fast dynamical responses to the converter. At last, some other simulation results are presented to prove that the DISM controller is a promising method for the converter to eliminate the steady-state error.

  12. Studi Komparasi Fungsi Keanggotaan Fuzzy sebagai Kontroler Bidirectional DC-DC Converter pada Sistem Penyimpan Energi

    Directory of Open Access Journals (Sweden)

    Eka Prasetyono

    2015-09-01

    Full Text Available Bidirectional DC-DC converter is needed in the energy storage system. The converter topology used in this paper was a non-isolated bidirectional DC-DC buck-boost converter. This converter worked in two ways, which the charging mode stored energy into battery when load current was less than nominal main DC current (set point and discharging mode transferred energy from battery to the load when its current exceeded set point value. Both of these modes worked automatically according to the load current. The charging and discharging currents were controlled by fuzzy logic controller which was implemented on microcontroller ARM Cortex-M4F STM32F407VG. This paper compares two types of fuzzy membership function (triangular and sigmoid in controlling bidirectional DC-DC converter. The results showed that fuzzy logic controller with triangle membership function and sigmoid as control bidirectional DC-DC converter had no significant different response, both had an average error for charging and discharging process under 4% with ripple current on the main DC bus around 0.5%. The computing time of program for fuzzy logic controller with triangular membership functions had 19.01% faster than sigmoid, and fuzzy logic computation time on a microcontroller with hardware floating point was 60% faster than software floating point.

  13. Médicos, prostitución y enfermedades venéreas en Colombia (1886-1951 Physicians, prostitution, and venereal disease in Colombia (1886-1951

    Directory of Open Access Journals (Sweden)

    Diana Obregón

    2002-01-01

    Full Text Available Este trabajo examina la lucha del cuerpo médico colombiano contra las enfermedades 'venéreas' entre 1886 y 1951. En este período, Colombia sufrió procesos de urbanización, crecimiento de población, nacimiento de la industria y aparición de una clase media y de un proletariado urbano. Los médicos encontraron una conexión estrecha entre la difusión del contagio de la sífilis y la gonorrea, y el aumento del ejercicio de la prostitución en las ciudades. A finales del siglo XIX, los médicos y los organismos de higiene asumieron la prostitución como inevitable; en 1907 consiguieron reglamentarla y fundaron dispensarios para aplicar los tratamientos de mercurio y compuestos arsenicales. Hacia los años 1930 y 1940, la curación de las enfermedades venéreas se asumió como un deber estatal de defensa de la raza y a favor de la civilización y del progreso. Hacia 1950, el uso eficaz de la penicilina hizo que la cuestión de la prostitución se volviera a plantear en términos más morales y estéticos, y se impuso la abolición de las normas que regulaban su ejercicio, por lo menos en Bogotá.The article examines the Colombian medical field's fight against so-called venereal diseases between 1886 and 1951, a period when the country was undergoing processes of urbanization, population growth, and the emergence both of industry as well as of a middle class and an urban proletariat. Physicians found a close connection between the spread of syphilis and gonorrhea and the rise of prostitution in cities. At the close of the 19th century, doctors and public health bodies assumed prostitution was inevitable. In 1907 they managed to have it legalized and they opened clinics to dispense mercury therapy and treatment with arsenic compounds. Starting in the 1930s and 1940s, treatment of venereal diseases was viewed as the State's duty, necessary to protect "la raza" and safeguard progress and civilization. As of 1950, the efficient use of penicillin

  14. EVALUACIÓN DEL IMPACTO PRESUPUESTAL DE UNA NUEVA TÉCNICA DIAGNÓSTICA PARA LA VIGILANCIA EPIDEMIOLÓGICA DE LA ENFERMEDAD RESPIRATORIA AGUDA EN UN LABORATORIO DE REFERENCIA EN BOGOTÁ, COLOMBIA

    Directory of Open Access Journals (Sweden)

    Liliana Patricia Díaz Cuevas

    2016-04-01

    Full Text Available

    Objetivo: Evaluar el impacto presupuestal de introducir una nueva técnica diagnóstica para la vigilancia epidemiológica en la enfermedad respiratoria aguda en un laboratorio de referencia en Bogotá, Colombia.

    Materiales y métodos: Estudio de impacto presupuestario desde la perspectiva del tercero pagador, para la patología de ERA con criterios de Infección respiratoria aguda grave (IRAG, con un horizonte temporal de cinco años (2013-2017, determinando los costos directos de las pruebas y su impacto en la población.

    Resultados: Al introducir la nueva técnica en forma progresiva hasta llegar al 75%, a los cinco años, el impacto fue un incremento del presupuesto en un 27% ($203.463.717 más que con el costo de las pruebas actuales. El análisis de sensibilidad univariado, modificando la variable porcentaje de introducción de la nueva prueba, permitió establecer que a un menor porcentaje de inversión de las pruebas actuales y un porcentaje mayor de introducción de la nueva prueba, el impacto en el costo del presupuesto al término de los cinco años será mayor.

    Conclusiones: La introducción de la nueva técnica diagnóstica hasta el 75% en el horizonte temporal de cinco años, tendrá un impacto del 27% en el presupuesto, comparado con la utilización de las pruebas actuales. La ampliación del perfil viral y el acercamiento a la realidad, permitirá formular nuevas políticas públicas en el tratamiento y pronóstico de la ERA en la población de Bogotá.

    BUDGET IMPACT ASSESSMENT OF A NEW DIAGNOSTIC TECHNIQUE FOR SURVEILLANCE OF ACUTE RESPIRATORY DESEASE IN A LABORATORY REFERENCE IN BOGOTA-COLOMBIA

    ABSTRACT

    Objective: To evaluate the budget impact of the introduction of a new diagnostic test for epidemiological surveillance for acute respiratory illness in a reference

  15. GRIP DC-8 DROPSONDE V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The DC-8 dropsonde system uses an integrated, highly accurate, GPS-located atmospheric profiling dropsonde, which measures and records current atmospheric conditions...

  16. dc power system for deuteron accelerator

    Energy Technology Data Exchange (ETDEWEB)

    Creek, K.O.; Liska, D.J.

    1981-01-01

    The Fusion Materials Irradiation Test (FMIT) Facility dc power system provides excitation current for all linac and High-Energy Beam Transport (HEBT) quadrupole and bending magnets, excitation for horizontal and vertical beam steering, and current-bypass shunts.

  17. NAMMA DC-8 DROPSONDE V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The DC-8 dropsonde system uses an integrated, highly accurate, GPS-located atmospheric profiling dropsonde, which measures and records current atmospheric conditions...

  18. GRIP DC-8 DROPSONDE V3

    Data.gov (United States)

    National Aeronautics and Space Administration — The GRIP DC-8 Dropsonde V3 dataset consists of atmospheric pressure, dry-bulb temperature, dew point temperature, relative humidity, wind direction, wind speed, and...

  19. COMERCIO DE FAUNA SILVESTRE EN COLOMBIA WILDLIFE TRADE IN COLOMBIA

    Directory of Open Access Journals (Sweden)

    Néstor Javier Mancera Rodríguez

    2008-12-01

    Full Text Available Este trabajo ofrece un panorama sobre las actividades relacionadas con el comercio de bienes derivados de las especies de fauna silvestre en Colombia, abordando el tema desde el desarrollo que ha tenido su actividad productiva, el aprovechamiento extractivo, así como la dinámica de su comercio legal e ilegal en el país y el desarrollo y promoción de alternativas productivas sustentadas en su aprovechamiento. Se analizó la información secundaria de entidades como el Ministerio de Ambiente, Vivienda y Desarrollo Territorial, las Corporaciones Autónomas Regionales y Autoridades Ambientales Urbanas, el Instituto Colombiano de Desarrollo Rural-INCODER, las Autoridades Policiales, los Institutos de Investigación, el Departamento Administrativo Nacional de Estadística, la Dirección de Impuestos y Aduanas Nacionales-DIAN, el Ministerio de Comercio, Industria y Turismo, y PROEXPORT. entre otras. En Colombia, el comercio de especies de fauna silvestre está centrado principalmente en la extracción de ejemplares de forma ilegal, lo cual ha generado desequilibrios en las poblaciones naturales y ha repercutido en el deterioro de la dinámica de los ecosistemas. El comercio legal de fauna silvestre se basa en la producción de unas pocas especies entre las que se destacan la babilla (Caiman crocodilus, el chigüiro (Hydrochaeris hydrochaeris, cerca de 200 especies de peces ornamentales y en menor medida el lobo pollero (Tupinambis nigropunctatus, la iguana (Iguana iguana, la boa (Boa constrictor, escarabajos (Dynastes hercules y mariposas. En el país no se tiene información exacta sobre el número de incautaciones realizadas en los operativos de control al tráfico ilegal de fauna, y no existe un conocimiento de la dinámica de este comercio ilegal.This work offers a current view on the activities related to the trade of derived from the wildlife species in Colombia, approaching the topic from the development that has had its productive activity

  20. Application handbook for a Standardized Control Module (SCM) for DC-DC converters, volume 1

    Science.gov (United States)

    Lee, F. C.; Mahmoud, M. F.; Yu, Y.

    1980-01-01

    The standardized control module (SCM) was developed for application in the buck, boost and buck/boost DC-DC converters. The SCM used multiple feedback loops to provide improved input line and output load regulation, stable feedback control system, good dynamic transient response and adaptive compensation of the control loop for changes in open loop gain and output filter time constraints. The necessary modeling and analysis tools to aid the design engineer in the application of the SCM to DC-DC Converters were developed. The SCM functional block diagram and the different analysis techniques were examined. The average time domain analysis technique was chosen as the basic analytical tool. The power stage transfer functions were developed for the buck, boost and buck/boost converters. The analog signal and digital signal processor transfer functions were developed for the three DC-DC Converter types using the constant on time, constant off time and constant frequency control laws.

  1. Ultra-high Efficiency DC-DC Converter using GaN Devices

    DEFF Research Database (Denmark)

    Ramachandran, Rakesh

    2016-01-01

    for many decades. However, the rate of improvement slowed as the silicon power materials asymptotically approached its theoretical bounds. Compared to Si, wideband gap materials such as Silicon Carbide (SiC) and Gallium Nitride (GaN) are promising semiconductors for power devices due to their superior...... properties of GaN devices can be utilized in power converters to make them more compact and highly efficient. This thesis entitled “Ultra-high Efficiency DC-DC Converter using GaN devices” focuses on achieving ultra-high conversion efficiency in an isolated dc-dc converter by the optimal utilization of Ga...... in this thesis. Efficiency measurements from the hardware prototype of both the topologies are also presented in this thesis. Finally, the bidirectional operation of an optimized isolated dc-dc converter is presented. The optimized converter has achieved an ultra-high efficiency of 98.8% in both directions...

  2. Early Oscillation Detection for Hybrid DC/DC Converter Fault Diagnosis

    Science.gov (United States)

    Wang, Bright L.

    2011-01-01

    This paper describes a novel fault detection technique for hybrid DC/DC converter oscillation diagnosis. The technique is based on principles of feedback control loop oscillation and RF signal modulations, and Is realized by using signal spectral analysis. Real-circuit simulation and analytical study reveal critical factors of the oscillation and indicate significant correlations between the spectral analysis method and the gain/phase margin method. A stability diagnosis index (SDI) is developed as a quantitative measure to accurately assign a degree of stability to the DC/DC converter. This technique Is capable of detecting oscillation at an early stage without interfering with DC/DC converter's normal operation and without limitations of probing to the converter.

  3. Optimized photovoltaic generator-water electrolyser coupling through a controlled DC-DC converter

    Energy Technology Data Exchange (ETDEWEB)

    Garcia-Valverde, R.; Miguel, C.; Urbina, A. [Universidad Politecnica de Cartagena, Departamento de Electronica, Tecnologia de Computadoras y Proyectos, Plaza del Hospital, 1, Cartagena, 30203 Murcia (Spain); Martinez-Bejar, R. [Universidad de Murcia, Departamento de Ingenieria de la Informacion y las Comunicaciones, Facultad de Informatica, Campus de Espinardo, 30071 Murcia (Spain)

    2008-10-15

    The coupling of a photovoltaic generator and an electrolyser is one of the most promising options for obtaining hydrogen from a renewable energy source. Both are well known technologies, however, since the high variability of the solar radiation, an efficient coupling still presents some challenges. Direct or through a DC-DC converter couplings are the options in isolated applications. In this work, three models, respectively, for a photovoltaic (PV) generator, a controlled DC-DC converter and a complete proton exchange membrane (PEM) electrolyser have been designed by using Matlab/Simulink. A PV-electrolyser specific algorithm to search for the optimum and safe working point for both elements is presented. Simulation results demonstrate that the use of a controlled DC-DC converter with the proposed algorithm shows better adaptability to the variable radiation conditions than the other coupling options. Therefore, it leads to a better compliance between the electrolyser and the sizing of the PV generator. (author)

  4. Test Results of Selected Commercial DC/DC Converters under Cryogenic Temperatures - A Digest

    Science.gov (United States)

    Patterson, Richard; Hammoud, Ahmad

    2010-01-01

    DC/DC converters are widely used in space power systems in the areas of power management and distribution, signal conditioning, and motor control. Design of DC/DC converters to survive cryogenic temperatures will improve the power system performance, simplify design, and reduce development and launch costs. In this work, the performance of nine COTS modular, low-tomedium power DC/DC converters was investigated under cryogenic temperatures. The converters were evaluated in terms of their output regulation, efficiency, and input and output currents. At a given temperature, these properties were obtained at various input voltages and at different load levels. A summary on the performance of the tested converters was given. More comprehensive testing and in-depth analysis of performance under long-term exposure to extreme temperatures are deemed necessary to establish the suitability of these and other devices for use in the harsh environment of space exploration missions.

  5. The Topologies Research of a Soft Switching Bidirectional DC/DC Converter

    DEFF Research Database (Denmark)

    Zhang, Qi; Zhang, Yongping; Sun, Xiangdong

    2017-01-01

    A soft-switching solution implemented to the traditional bidirectional DC/DC converter is developed. The soft-switching cell, which composed of three auxiliary switches, one resonant capacitor and one resonant inductor, is equipped in the traditional bidirectional DC/DC converter to realize circuit...... from a hard turning off process in one of the auxiliary switches, while the others experience the soft operation. As for the other method, the zero voltage or zero current transmissions in all switches are realized, however, the relative higher but fixed conduction losses are introduced by the resonant...... circle. And the proposed topology of bidirectional soft-switching dc-dc converter(TASBC) performs ideal soft switching at boost operations. The characteristics of the proposed converter has been verified by MATLAB simulations and experimental results....

  6. The DC-DC converter reduces its size and increases its efficiency; Le convertisseur DC-DC reduit sa taille et augmente son rendement

    Energy Technology Data Exchange (ETDEWEB)

    Feste, J.P.

    2000-03-01

    The DC to DC converters built by the US SynQor company use a dual stage conversion technique. One stage is devoted to regulation and the other to insulation. This technique allows to combine a high efficiency (up to 90%) with small dimensions. Instead of the classical Schottky diodes, a synchronous MOSFET is used for the rectification of the low voltage current. A simple air flow is required for the cooling of these converters. Short paper. (J.S.)

  7. dc illusion and its experimental verification

    Science.gov (United States)

    Liu, Min; Lei Mei, Zhong; Ma, Xiang; Cui, Tie Jun

    2012-07-01

    Based on the transformation optics method, we propose a dc illusion device, which can transform a metallic object into a magnified dielectric object using anisotropic conducting materials. Utilizing the analogy between electric conductivities and resistor networks, we design and fabricate the device using metal film resistors. The practical measurement data agree very well with simulation results. The proposed dc illusion device is easy to process and measure, and thus has potential applications in various sectors.

  8. DC-Link Compensation Method for Slim DC Link Drives Fed by Soft Grid

    DEFF Research Database (Denmark)

    Mathe, Laszlo; Rosendahl Andersen, Henrik; Lazar, Radu

    2010-01-01

    Slim DC-link PWM (AC) drives for lowperformance applications are emerging on the market. Such drives equipped with a small DC-link capacitance exhibit instability tendencies, if installed on a soft line, giving a degraded performance. The total harmonic distortion (THD) and the partially weighted...... method, which ensures the stability of the slim DC-link on a soft grid. The proposed compensation method may be used for open- and closedloop control schemes, requiring a small overhead in the digital implementation....

  9. Tightening the Screws: Restoring Security in Colombia

    National Research Council Canada - National Science Library

    Stough, Michael S

    2003-01-01

    .... As the source for 80 percent of the cocaine imported into the U.S., and a nation in conflict with American-designated terrorist groups, Colombia represents a convergence of major American interests...

  10. Colombia: durable solutions for the forcibly displaced

    Directory of Open Access Journals (Sweden)

    Amaya Valcárcel

    2017-10-01

    Full Text Available Colombia has a sophisticated body of law and a wealth of experience in the development of policies for the forcibly displaced. However, numerous obstacles stand in the way of attaining permanent solutions to displacement.

  11. Plan Colombia, Consequences for Venezuelan Natonal Security

    National Research Council Canada - National Science Library

    Arroyo, Alfredo

    2002-01-01

    ...% reduction in cocaine production), and narcotics trafficking groups move into Venezuela, the government will have to commit its Armed Forces but, under unequal military and technological conditions when compared to Colombia...

  12. Colombia test cases strengthen IDP protection

    Directory of Open Access Journals (Sweden)

    Maria Beatriz Nogueira

    2007-07-01

    Full Text Available Ground-breaking decisions in two cases brought against the state of Colombia have demonstrated the potential of human rights jurisprudence in clarifying IDP rights and establishing new mechanisms and standards in domestic and international protection.

  13. Bartoneliasis: fiebre verrucosa del guaitara en colombia

    OpenAIRE

    Patiño Camargo, Luis

    2011-01-01

    En Colombia, al descubrirla, diósele (1) a esta dolencia los siguientes nombres: Bartonellosis, Fiebre verrucosa del Guaitara y Verruga, análoga a la enfermedad de Carrión, Fiebre de Oroya y Verruga Peruana.

  14. Future scenarios of energy for Colombia

    International Nuclear Information System (INIS)

    Smith, Ricardo A; Vesga, Daniel; Cadena, Angela I

    2000-01-01

    The author includes topics as, requirements for the scenarios; process of scenarios, certainty and uncertainty to the horizon of the 2020, definition of axis for the histories and energy scenario for Colombia

  15. Colombia: More Than Just a Drug Problem

    National Research Council Canada - National Science Library

    Wynne, Charles E

    2003-01-01

    ... of $45 billion in the year 2000. While estimates vary, most experts agree between 80-90 percent of the cocaine and more than 50 percent of the heroin used in the United States comes from Colombia...

  16. Guerrilla Violence in Colombia: Examining Causes and Consequences

    Science.gov (United States)

    1994-06-01

    34Perfil de Coyntura Econ6mica", in Revista Economia Colombiana # 4, Contraloria General de la Repi~blica, 1988. 67 TABLE I. MINIMUM SALARY ANNUAL...Sciences Faculty of Antioquia University, "Perfil de Coyntura Econ6mica", in Revista Economia Colombiana # 4, Contraloria General de la Repifblica, 1988...and offering support to all initiatives that contributed 3 Pecaut, Daniel, Cr6nica de dos D&adas de Polftica Colombiana , Siglo XXI editores, Bogota

  17. Evaluation of the contamination for Hg and Pb in horticultural soils of the Bogota Savanna and of the effect of the Hg and Pb of the watering water and of the soils in several vegetables

    International Nuclear Information System (INIS)

    Vargas Zarate, Orlando; Mejia C, Leonidas

    1998-01-01

    Soils of six different horticultural zones of the Sabanna of Bogota were studied to quantify Hg and Pb accumulation in soils and crops caused by traditional and continuous irrigation with the highly polluted waters of Bogota River and its effluents. Soils of site No.6 representative of Rio Bogota is series (a fine clayed, mixed, isothermic family of aeric fluventic tropaquepts) was selected for greenhouse experiments conducted to show: a) The amounts of Hg and Pb absorbed by 3 different vegetables (lettuce, cucumber and carrots) grown under greenhouse conditions, irrigated with waters with variable Hg and Pb concentrations; b) the effects of increased levels of Hg and Pb in irrigation water on the accumulation level of both metals in soils at the harvest; and c) the individual effect and interactions of Hg and Pb on yields of each one vegetable. Results afforded this conclusions: 1) soils of all six sites have average Hg and Pb concentrations (0.5 and 110 ppm respectively) which exceed normal levels for soils (who, 1976); site 6 has the highest level of Hg and Pb accumulation (1.6 and 3.36 ppm); 2) for all three vegetables Hg and Pb accumulation level was almost proportional to Hg and Pb concentration in irrigation water; 3) Hg and Pb concentration in edible parts was different for each vegetable. Average contents of Hg and Pb were respectively 33 ppb and 172 ppm in lettuce; 24 ppb and 10 ppm in cucumber and 36 ppb and 48 ppm in carrots. Average absorption of Pb in lettuce was 17 times higher than in cucumber and 3.5 times higher than in carrots; Pb absorption levels widely surpass those recommended as permissible by WHO (1976) 4) high correlation coefficients were found between Hg and Pb absorption by lettuce (R=0.94 and 0.97 respectively), cucumber (R=0.89 and R=0.80 respectively) and carrots (R=0.99 y R=0.85 respectively) and the corresponding Hg and Pb accumulation levels in soils at harvest; 5) Effects of Hg and Pb levels in irrigation water on yields was

  18. Digital peak current mode control with adaptive slope compensation for DC-DC converters

    DEFF Research Database (Denmark)

    Andersen, Karsten Holm; Nymand, Morten

    2017-01-01

    This paper presents an adaptive slope compensation method for peak current mode control of digital controlled DC-DC converters, which controls the quality factor of the complex conjugated poles at half the switching frequency. Using quality factor control enables optimization of the dynamic...... performance and stability of current mode control. The presented method adapt to DC-DC converter operating conditions by estimating the rising and falling inductor current slopes, to apply a current slope compensation value to obtain a constant quality factor. The experimental results verifies the theoretical...

  19. The application of standardized control and interface circuits to three dc to dc power converters.

    Science.gov (United States)

    Yu, Y.; Biess, J. J.; Schoenfeld, A. D.; Lalli, V. R.

    1973-01-01

    Standardized control and interface circuits were applied to the three most commonly used dc to dc converters: the buck-boost converter, the series-switching buck regulator, and the pulse-modulated parallel inverter. The two-loop ASDTIC regulation control concept was implemented by using a common analog control signal processor and a novel digital control signal processor. This resulted in control circuit standardization and superior static and dynamic performance of the three dc-to-dc converters. Power components stress control, through active peak current limiting and recovery of switching losses, was applied to enhance reliability and converter efficiency.

  20. Egr2 induced during DC development acts as an intrinsic negative regulator of DC immunogenicity.

    Science.gov (United States)

    Miah, Mohammad Alam; Byeon, Se Eun; Ahmed, Md Selim; Yoon, Cheol-Hee; Ha, Sang-Jun; Bae, Yong-Soo

    2013-09-01

    Early growth response gene 2 (Egr2), which encodes a zinc finger transcription factor, is rapidly and transiently induced in various cell types independently of de novo protein synthesis. Although a role for Egr2 is well established in T-cell development, Egr2 expression and its biological function in dendritic cells (DCs) have not yet been described. Here, we demonstrate Egr2 expression during DC development, and its role in DC-mediated immune responses. Egr2 is expressed in the later stage of DC development from BM precursor cells. Even at steady state, Egr2 is highly expressed in mouse splenic DCs. Egr2-knockdown (Egr2-KD) DCs showed increased levels of major histocompatability complex (MHC) class I and II and co-stimulatory molecules, and enhanced antigen uptake and migratory capacities. Furthermore, Egr2-KD abolished SOCS1 expression and signal transducer and activator of transcription 5 (STAT5) activation during DC development, probably resulting in the enhancement of IL-12 expression and Th1 immunogenicity of a DC vaccine. DC-mediated cytotoxic T lymphocyte (CTL) activation and antitumor immunity were significantly enhanced by Egr2-KD, and impaired by Egr2 overexpression in antigen-pulsed DC vaccines. These data suggest that Egr2 acts as an intrinsic negative regulator of DC immunogenicity and can be an attractive molecular target for DC vaccine development. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  1. Electrostatic Energy Harvesting Circuit with DC-DC Convertor for Vibration Power Generation System

    Science.gov (United States)

    Wei, J.; Lefeuvre, E.; Mathias, H.; Costa, F.

    2016-11-01

    This paper presents an interface circuit with power control features for electrostatic vibration energy harvesting. A DC-DC convertor is used to control the output voltage of a diode-based charge pump circuit. Therefore, the maximum and minimum voltage across the variable capacitor of the energy harvester may be adjusted to track the maximum power point of the system. The power conversion function of the DC-DC convertor depends on the switches configuration. An example of Maximum Power Point Tracking (MPPT) for different conversion function is presented in this paper. Simulation results show that at least 10 μW is generated.

  2. Climate protection in Colombia. An overview

    International Nuclear Information System (INIS)

    Lemberg, Katrin

    2014-01-01

    The effects of the climatic change in Colombia includes the increase of sea level at the Caribbean and the Pacific coast, the increase of temperature, the increase of precipitation, effecting the agricultures, the ecosystems, the water supply and the public health. Colombia has already started specific programs, adaptation measures with respect to the effects of the climatic change, reduction of the greenhouse gas emissions and projects with respect to the reduction of emissions due to deforestation and degradation.

  3. Determination of an efficient irrigation schedule for the cultivation of rose cv. Freedom under greenhouse conditions in Colombia

    Directory of Open Access Journals (Sweden)

    Jhon Jairo Arévalo

    2014-04-01

    Full Text Available An experiment on rose (Rosa sp. cv. Freedom was performed in a greenhouse on the Bogota Plateau, Colombia, to identify an efficient irrigation regime for this crop. The tested treatments were based on three irrigation doses, applying different fractions of the estimated crop evapotranspiration (ETc, calculated using a class A evaporation tank: i 100% ETc (ETc100, ii 80% ETc (ETc80 and iii 70% ETc (ETc70. During the entire experimental period, from mid-May to early September, the crop had a constant production of floral stems. In all of the irrigation treatments, the soil and plant water status were monitored using tensiometers and the midday stem water potential, respectively (ystem. In the fully irrigated roses, the actual water use was determined using a drainage lysimeter in order to obtain the local crop coefficients (Kc by means of a water balance. From June to August, the obtained monthly Kc values varied between 1.10 and 1.26. Compared to the ETc100 treatment, 14.5 and 21.8% less water was applied in treatments ETc80 and ETc70, respectively. Despite this fact, no statistically significant differences were found among the treatments for rose production or quality. Finally, in the more irrigated roses, tight relationships between the stem water potential and vapor pressure deficit were obtained. The reported base-line equations can be used for predicting the optimum rose plant water status, depending on the environmental conditions. Overall, the reported results can be used for an efficient irritation schedule for rose crops under greenhouse conditions, using the local Kc and direct determinations of plant water status corrected for the evaporative demand.

  4. Evaluation of the Perception of a University Group of Teachers about Education as a Social Phenomenon in Colombia

    Directory of Open Access Journals (Sweden)

    Jorge Enrique Moreno-Collazos

    2016-09-01

    Full Text Available Objective: This paper aims to evaluate the perception of a university group of teachers about education as a social phenomenon. An analytical cross-sectional study was conducted with a group of university teachers in Bogota, Colombia, in October 2014. A survey was applied in order to evaluate the perception about education as a social phenomenon; the data analysis was performed using SPSS software version 19. The population studied consisted of 60 university professors with an average age of 42.2 ± 14.4 years, and with 6.15 years of teaching practice. Male gender was predominant with 53% (n = 32. There were statistically significant differences in the results related to the concept of education (p = 0.05 to 0.00 and to the following items: “Do you consider that investment in public education is enough?” (p = 0.02, “Is education a political model?” (P = 0.03; in aggregate age, “Is access to higher education conceived by the Colombian government with social concern?”, “Does the environment influence the Colombian student’s education development?” (p = 0.02 to 0.00; it was the same case for the interpretive sociology for the item “Are patterns of educational assessment adequate in the country?” (p = 0.04. In conclusion, it was found that there are differences in teachers’ conceptions about the construction of education as a social phenomenon.f education as a social phenomenon by finding differences between the conceptions of it in teaching.

  5. The dual burden of malnutrition in Colombia.

    Science.gov (United States)

    Sarmiento, Olga L; Parra, Diana C; González, Silvia A; González-Casanova, Inés; Forero, Ana Y; Garcia, Johnattan

    2014-12-01

    Almost all nutrition policies in Colombia currently focus on either undernutrition or obesity, with the predominant emphasis on undernutrition. It is crucial to assess the prevalence of the dual burden of malnutrition in Colombia to better target programs and policies. The aim was to estimate the national prevalence of the dual burden of malnutrition in Colombia at the individual and household levels in children aged Colombia, low to high prevalences of overweight and obesity (3.4-51.2%) coexist with moderate to high prevalences of anemia (8.1-27.5%) and stunting (13.2%). The observed prevalence of the dual burden was lower than expected. Approximately 5% of households had at least one stunted child aged Colombia are lower than expected. Despite the independence of the occurrence of these conditions, the fact that the dual burden coexists at the national, household, and intraindividual levels suggests that public policies should address both conditions through multiple strategies. It is imperative to evaluate the current nutrition policies to inform malnutrition prevention efforts in Colombia and to share lessons with other countries at a similar stage of nutritional transition. © 2014 American Society for Nutrition.

  6. Known uraniferous occurrences in Colombia

    International Nuclear Information System (INIS)

    Rodriguez, H.; Aluja, J.A.; Pfeiffer, J.; Cortes, L.A.

    1981-01-01

    On the basis of an internal report entitled 'Possibilities of Uranium in Colombia' compiled by the author in 1973, and as a result of work done by the foreign companies TOTAL-MINATOME (France) and ENUSA (Spain) using carborne radiometric techniques, ground surveys (plus occasional aerial prospecting) and geochemical methods (sediments and waters), approximately 260 uranium anomalies (in 1973 the figure was 106) have been discovered after covering 30% of the areas considered under priorities I, II and III (321,000 km 2 ), together with 16,000 km of the national road network (+-44,000 km). In addition to supporting the original selection, these results indicate considerable variation in the geological conditions and metallogenic associations, which IAN, MINATOME and ENUSA have now begun to evaluate in the hope of obtaining specific data by the end of 1980. (author)

  7. Regional economic disparities in Colombia

    Directory of Open Access Journals (Sweden)

    Jaime Bonet

    2009-06-01

    Full Text Available This paper advances the analysis of regional income convergence inColombia, through the use of the income data recently estimated for the departments,the main subnational political units. The results show a polarization process betweenBogotá and the rest of the departments. The preponderance of Bogotá during the periodanalyzed is also discussed: its per capita income is more than double that of thenational average, and more than eight times the per capita income of the poorest department,Chocó. Persistence in the departmental per capita income ranking is observed:Bogotá is always ahead, while the departments in the periphery are in the last places.The findings lead to the conclusion that it is necessary to design policies to correctthe significant disparities in per capita income between Colombian regions.

  8. Helmintiasis y protozoasis en Colombia

    Directory of Open Access Journals (Sweden)

    Luis Patiño Camargo

    1940-02-01

    Full Text Available Sabre un territorio de más de un millón de kilómetres cuadrados caracrerizado por la multiplicidad de climas y la variedad topográfica de su relieve, habita el pueblo de Colombia de cerca de nueve millones de personas de un tipo humano con caracteres propios en via de eetabilización. El parasitismo intestinal por helmintos y protozoarios es una pandemia de todos los climas colombianos, pera alcanza su intensidad maxima en las zonas extendidas del nivel del mar a 2.000 metros de elevación con temperaturas medias de 32° a 16° grados oentígrados.

  9. Las marcas propias en Colombia

    Directory of Open Access Journals (Sweden)

    Carlos Felipe Payán Rodríguez

    2013-11-01

    Full Text Available El artículo analiza la situación actual de las marcas propias en Colombia, teniendo en cuenta su creciente auge al interior de las grandes superficies. Mediante este tipo de marcas el mismo distribuidor vende productos y servicios con su nombre o recurriendo a una marca de su propiedad, compitiendo con las marcas ya posicionadas en el mercado de los fabricantes. El texto se articula, primero, en una contextualización con base en doctrina comparada respecto de las marcas propias. Luego, se aplican las reglas de dichos conceptos doctrinales a la situación actual colombiana. Por último, se plantean dos problemas jurídicos respecto de las marcas propias, uno, analizado desde la propiedad industrial, y el otro, desde las reglas del Estatuto del Consumidor.

  10. 75 FR 61573 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2010-10-05

    ... 16689631 (Colombia) (individual) 3. BAEZA MOLINA, Carlos Alberto, c/o DERECHO INTEGRAL Y CIA. LTDA., Cali..., Colombia; c/o INTERCONTINENTAL DE AVIACION S.A., Bogota, Colombia; DOB 9 Mar 1938; POB Riofrio, Valle...

  11. Colombia - The Quality of Education in Colombia : An Analysis and Options for a Policy Agenda

    OpenAIRE

    World Bank

    2008-01-01

    The main objective of this report is to analyze student learning in Colombia in order to foster policies to improve education quality that are grounded in research and the Colombian context. In 2006, Colombia participated for the first time in the Programme for International Student Assessment (PISA) of the Organization for Economic Cooperation and Development (OECD), which provides an imp...

  12. A comparative analysis of costs of single and dual rapid HIV and syphilis diagnostics: results from a randomised controlled trial in Colombia.

    Science.gov (United States)

    Obure, Carol Dayo; Gaitan-Duarte, Hernando; Losada Saenz, Ricardo; Gonzalez, Lina; Angel-Muller, Edith; Laverty, Maura; Perez, Freddy

    2017-11-01

    HIV and congenital syphilis are major public health burdens contributing to substantial perinatal morbidity and mortality globally. Although studies have reported on the costs and cost-effectiveness of rapid diagnostic tests (RDTs) for syphilis screening within antenatal care in a number of resource-constrained settings, empirical evidence on country-specific cost and estimates of single RDTs compared with dual RDTs for HIV and syphilis are limited. A cluster randomised controlled study design was used to compare the incremental costs of two testing algorithms: (1) single RDTs for HIV and syphilis and (2) dual RDTs for HIV and syphilis, in 12 health facilities in Bogota and Cali, Colombia. The costs of single HIV and syphilis RDTs and dual HIV and syphilis RDTs were collected from each of the health facilities. The economic costs per woman tested for HIV and syphilis and costs per woman treated for syphilis defined as the total costs required to test and treat one woman for syphilis were estimated. A total of 2214 women were tested in the study facilities. Cost per pregnant woman tested and cost per woman treated for syphilis were US$10.26 and US$607.99, respectively in the single RDT arm. For the dual RDTs, the cost per pregnant woman tested for HIV and syphilis and cost per woman treated for syphilis were US$15.89 and US$1859.26, respectively. Overall costs per woman tested for HIV and syphilis and cost per woman treated for syphilis were lower in Cali compared with Bogota across both intervention arms. Staff costs accounted for the largest proportion of costs while treatment costs comprised <1% of the preventive programme. Findings show lower average costs for single RDTs compared with dual RDTs with costs sensitive to personnel costs and the scale of output at the health facilities. NCT02454816; results. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/.

  13. Research and Construction of DC Energy Measurement Traceability Technology

    Science.gov (United States)

    Zhi, Wang; Maotao, Yang; Jing, Yang

    2018-02-01

    With the implementation of energy saving and emission reduction policies, DC energy metering has been widely used in many fields. In view of the lack of a DC energy measurementtraceability system, in combination with the process of downward measurement transfer in relation to the DC charger-based field calibration technology and DC energy meter and shunt calibration technologies, the paper proposed DC fast charging, high DC, small DC voltage output and measuring technologies, and built a time-based plan by converting high DC voltage into low voltage and high current into low current and then into low voltage, leaving DC energy traceable to national standards in terms of voltage, current and time and thus filling in the gap in DC energy measurement traceability.

  14. The Revolutionary Armed Forces of Colombia - People’s Army (FARC-EP): Marxist-Leninist Insurgency or Criminal Enterprise

    Science.gov (United States)

    2005-12-01

    Landazábal’s public defiance of civil authority, the general was relieved of his position and subsequently retired. 32 Socorro Ramírez, “El proceso de...Bogotá D.C., 2003), 273. 33 Socorro Ramírez, “El proceso de paz de Belisario Betancur”, in Tiempos de Paz: Acuerdos en Colombia, 1902-1994, eds...José Miguel Narvaéz Martínez, Deputy Director of the Departamento Administrativo de Seguridad (Colombian equivalent of U.S. FBI), interview by author

  15. A Novel Quadratic Buck-Boost DC-DC Converter without Floating Gate-Driver

    DEFF Research Database (Denmark)

    Mostaan, Ali; A. Gorji, Saman; N. Soltani, Mohsen

    2016-01-01

    A novel buck-boost dc-dc converter with high voltage step-up and step-down ability has been introduced in this paper. There are two switches in this converter, of which the sources are connected together and also connected to the ground of the input voltage source. Hence, there is no need for flo...

  16. A Novel Single Switch Transformerless Quadratic DC/DC Buck-Boost Converter

    DEFF Research Database (Denmark)

    Mostaan, Ali; A. Gorji, Saman; N. Soltani, Mohsen

    2017-01-01

    A novel quadratic buck-boost DC/DC converter is presented in this study. The proposed converter utilizes only one active switch and can step-up/down the input voltage, while the existing single switch quadratic buck/boost converters can only work in step-up or step-down mode. First, the proposed ...

  17. Interleaved Self-Oscillating Class E Derived Resonant DC/DC Converters

    DEFF Research Database (Denmark)

    Kovacevic, Milovan; Knott, Arnold; Andersen, Michael A. E.

    2012-01-01

    A new method for achieving self-oscillating, self-interleaved operation of class E derived resonant DC/DC converters is presented. The proposed method is suitable for operation at frequencies in the Very High Frequency (VHF) band. Interleaved and self-oscillating modes of operation are achieved......% in continuous operation....

  18. SEE Transient Response of Crane Interpoint Single Output Point of Load DC-DC Converters

    Science.gov (United States)

    Sanders, Anthony B.; Chen, Dakai; Kim, Hak S.; Phan, Anthony M.

    2011-01-01

    This study was undertaken to determine the single event effect and transient susceptibility of the Crane Interpoint Maximum Flexible Power (MFP) Single Output Point of Load DC/DC Converters for transient interruptions in the output signal and for destructive and non destructive events induced by exposing it to a heavy ion beam..

  19. Magnetically integrated high step-up resonant DC-DC converter for distributed photovoltaic systems

    DEFF Research Database (Denmark)

    Vinnikov, Dmitri; Chub, Andrii; Liivik, Elizaveta

    2017-01-01

    In this paper magnetically integrated resonant single-switch quasi-Z-source DC-DC converter is evaluated as a candidate topology for the low-cost photovoltaic microconverter. The derivation of the topology and its basic operation principle are explained. Generalized design guidelines...

  20. Very High Frequency Resonant DC/DC Converters for LED Lighting

    DEFF Research Database (Denmark)

    Madsen, Mickey Pierre; Knott, Arnold; Andersen, Michael A. E.

    2013-01-01

    This paper presents a very high frequency DC/DC converter for LED lighting. Several resonant topologies are compared and their usability discussed. At the end the resonant SEPIC converter is chosen based on the achievable power density and total bill of material. Simulations of a 51 MHz converter...

  1. GaN-based High Efficiency Bidirectional DC-DC Converter with 10 MHz Switching Frequency

    DEFF Research Database (Denmark)

    Kruse, Kristian; Zhang, Zhe; Elbo, Mads

    2017-01-01

    -isolated bidirectional DC-DC converter equipped with Gallium Nitride (GaN) semiconductor transistors is presented. The converter’s operation principles, zero-voltage switching (ZVS) constraints and dead-time effects are studied. Moreover, the optimization and tradeoffs on the adopted high-frequency inductor...

  2. Area-Efficiency Trade-Offs in Integrated Switched-Capacitor DC-DC Converters

    DEFF Research Database (Denmark)

    Spliid, Frederik Monrad; Larsen, Dennis Øland; Knott, Arnold

    2016-01-01

    This paper analyzes the relationship between efficiency and chip area in a fully integrated switched capacitor voltage divider dc-dc converter implemented in 180nm-technology and a 1/2 topology. A numerical algorithm for choosing the optimal sizes of individual components, in terms of power loss,...

  3. DC-DC converter with a wide load range and a wide input-voltage range

    NARCIS (Netherlands)

    Ting, Y.

    2015-01-01

    This thesis investigated the possibility of increasing the efficiency of a DC-DC converter over a wide load range and a wide input-voltage range based on the Single Active Bridge (SAB) topology with two approaches. The first approach involved making changes to the topology whereas the second made

  4. Modelling, simulation and construction of a dc/dc boost power converter: a school experimental system

    International Nuclear Information System (INIS)

    Silva-Ortigoza, R; Marciano-Melchor, M; Silva-Ortigoza, G; Hernández-Guzmán, V M; Saldaña-González, G; Marcelino-Aranda, M

    2012-01-01

    We introduce a dc/dc boost power converter as a didactic prototype intended to support courses on electric circuit analysis experimentally. The corresponding mathematical model is obtained, the converter is designed and an experimental setup is described, constructed and tested. Simplicity of construction as well as low cost of components renders the feasible introduction of this equipment in undergraduate laboratories. (paper)

  5. A novel DC-DC convertor using LTCC technology for magnetic integration application

    Energy Technology Data Exchange (ETDEWEB)

    Xu, Z Q [Research Institutes, University of Electronic Science and Technology of China, Chengdu (China); Shi, Y; Guo, H P; Yang, B C, E-mail: nanterxu@uestc.edu.cn [State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu (China)

    2011-01-01

    A compact DC-DC convertor is proposed and fabricated in multilayer ferrite substrate using LTCC technology. The spiral conductors are buried into the ferrite substrate with a multilayer 3-D structure to reduce the volume of convertor. The passive integration of magnetic components and surface circuitry are achieved in a whole substrate and the size of module can be reduced markedly. The whole height of module is only 3mm, 1/3 of the height of conventional modules. Testing results indicate that the performance of the module is excellent in Point-of-Load (POL) field. The step-down DC-DC converter converts input voltage of 5V to output voltage of 3.3V. It is confirmed that the maximum conversion efficiency of 93.2% is sufficient for actual DC-DC converter application. Such a compact DC-DC convertor provides a compact, low cost and high reliability approach for power supply and magnetic integration application.

  6. Selection of DC/DC converter for offshore wind farms with MVDC power collection

    DEFF Research Database (Denmark)

    Dincan, Catalin Gabriel; Kjær, Philip Carne; Chen, Yu-Hsing

    2017-01-01

    Four DC/DC converters are analyzed and compared with respects to availability, efficiency, ratings, repair costs and power density. Intended application is offshore wind farms with MVDC power collection. The selected topology is a new series resonant converter, which offers 99% efficiency across...... the entire operational range, but needs components designed for high voltage stress....

  7. A New Sliding Mode Controller for DC/DC Converters in Photovoltaic Systems

    Directory of Open Access Journals (Sweden)

    M. Sarvi

    2013-01-01

    Full Text Available DC/DC converters are widely used in many industrial and electrical systems. As DC/DC converters are nonlinear and time-variant systems, the application of linear control techniques for the control of these converters is not suitable. In this paper, a new sliding mode controller is proposed as the indirect control method and compared to a simple direct control method in order to control a buck converter in photovoltaic applications. The solar arrays are dependent power sources with nonlinear voltage-current characteristics under different environmental conditions (insolation and temperature. From this point of view, the DC/DC converter is particularly suitable for the application of the sliding mode control in photovoltaic application, because of its controllable states. Simulations are performed in Matlab/Simulink software. The simulation results are presented for a step change in reference voltage and input voltage as well as step load variations. The simulations results of proposed method are compared with the conventional PID controller. The results show the good performance of the proposed sliding mode controller. The proposed method can be used for the other DC/DC converter.

  8. Expression of DC-SIGN and DC-SIGNRs in placentas of HIV ...

    African Journals Online (AJOL)

    ICAM3)-grabbing non-integrin (DC-SIGN) is a mannose-binding lectin that initiates interaction between dendritic cells and resting T-lymphocytes. DC-SIGN is highly expressed in placental tissue on dendritic cells and Hofbauer cells, and it is ...

  9. Analysis and design of PPFHB bidirectional DC-DC converter with coupled inductors

    DEFF Research Database (Denmark)

    Zhang, Zhe; Thomsen, Ole Cornelius; Andersen, Michael Andreas E.

    2009-01-01

    In this paper, a novel push-pull-forward half-bridge (PPFHB) bi-directional DC-DC converter with coupled inductors is proposed. All switches can operate under zero-voltage-switching (ZVS). The operation principle with phase-shift modulation scheme, characteristics of coupled inductors, the steady...

  10. A Novel Quasi-SEPIC High-Voltage Boost DC-DC Converter

    DEFF Research Database (Denmark)

    Siwakoti, Yam Prasad; N. Soltani, Mohsen; Blaabjerg, Frede

    2017-01-01

    This paper proposes a modified coupled-inductor SEPIC dc-dc converter for low power and high voltage gain applications such as for piezoelectric drive systems. The converter uses the same components as of SEPIC converter with an additional diode. Compared to conventional topologies with similar...

  11. Y-Source Boost DC/DC Converter for Distributed Generation

    DEFF Research Database (Denmark)

    Siwakoti, Yam P.; Loh, Poh Chiang; Blaabjerg, Frede

    2015-01-01

    This paper introduces a versatile Y-source boost dc/dc converter intended for distributed power generation, where high gain is often demanded. The proposed converter uses a Y-source impedance network realized with a tightly coupled three-winding inductor for high voltage boosting that is presently...

  12. A Bidirectional Multi-Port DC-DC Converter Integrating Voltage Equalizer

    DEFF Research Database (Denmark)

    Chen, Jianfei; Hou, Shiying; Deng, Fujin

    2015-01-01

    A novel bidirectional multi-port dc-dc converter integrating voltage equalizer based on switched-capacitor voltage accumulator (SCVA) is proposed. It has two operating modes of charging and discharging for battery modules. All battery modules are connected in series indirectly and can be equalized...

  13. Five-Level Active-Neutral-Point-Clamped DC/DC Converter

    DEFF Research Database (Denmark)

    Liu, Dong; Deng, Fujin; Chen, Zhe

    2016-01-01

    Multi-level converters are getting more and more attentions because of their obvious merits such as lower voltage stress and harmonic, smaller size of output filters, and so on. In this paper, a five-level active-neutral-point-clamped (5L-ANPC) dc/dc converter is proposed for power transfer...

  14. Integrated S-band transmitter with on-chip DC-DC converter and control loop

    NARCIS (Netherlands)

    Brouzes, H.; Geurts, S.; Besselink, M.; Telli, A.; Hek, A.P. de; Bent, G. van der; Vliet, F.E. van

    2012-01-01

    A highly integrated high-power transmitter has been designed in a high breakdown GaAs MMIC technology. The transmitter includes, on top of an S-Band 10 W class-F HPA, a DC/DC converter and its associated gate driver, the full voltage regulation control loop, which provides a significant step for

  15. Magnetically coupled high-gain Y-source isolated DC/DC converter

    DEFF Research Database (Denmark)

    Siwakoti, Yam P.; Loh, Poh Chiang; Blaabjerg, Frede

    2014-01-01

    A new form of magnetically coupled DC/DC converter is proposed for medium power applications (250 W to 2 kW), requiring a high-voltage gain, short inductive charging time and galvanic isolation. The proposed converter can be realised using a unique Y-source impedance network and a two-switch push...

  16. Design of current source DC/DC converter and inverter for 2kW fuel cell application

    DEFF Research Database (Denmark)

    Andreiciks, A.; Steiks, I.; Krievs, O.

    2013-01-01

    of a DC/DC converter and an inverter. In this paper a detailed simulation study of such interfacing converter system comprising a double inductor push-pull step-up DC/DC converter and a cascaded H-bridge inverter has been carried out and further confirmed with experimental results. The power converter...

  17. A Double Phase-Shift Control Strategy for A Full-Bridge Three-Level DC/DC Converter

    DEFF Research Database (Denmark)

    Liu, Dong; Deng, Fujin; Gong, Zheng

    2016-01-01

    In this paper, a double phase-shift control strategy is proposed for the full-bridge three-level (FBTL) DC/DC converter applied into DC distribution systems with the medium DC bus voltage. By utilizing the proposed control strategy, the voltage change rate dv/dt and voltage stress of the transfor...

  18. Research on Two-channel Interleaved Two-stage Paralleled Buck DC-DC Converter for Plasma Cutting Power Supply

    DEFF Research Database (Denmark)

    Yang, Xi-jun; Qu, Hao; Yao, Chen

    2014-01-01

    As for high power plasma power supply, due to high efficiency and flexibility, multi-channel interleaved multi-stage paralleled Buck DC-DC Converter becomes the first choice. In the paper, two-channel interleaved two- stage paralleled Buck DC-DC Converter powered by three-phase AC power supply...

  19. U.S. Support to Plan Colombia: A Heading Check

    National Research Council Canada - National Science Library

    Buckley, Kevin

    2004-01-01

    .... For some Latin American countries like Colombia these ideals fall quite short of reality. Colombia is plagued by internal problems which restrict its ability to adequately govern its population and territory...

  20. Guest Editorial Special Issue on Structured DC Microgrids

    DEFF Research Database (Denmark)

    Guerrero, Josep M.; Tan, Don F. D.

    2017-01-01

    With the development of dc coupled devices, such as photovoltaic generations, batteries, supercapacitors, LEDs, computers, and electronics equipment, low-voltage dc distribution networks, structured dc microgrids are emerging as a natural platform to integrate renewable energy sources. However...... in either series/parallel, forming a number of dc busses with different voltage levels. Recently, with the advance of new dc power technologies, several ongoing standards, alliances, and initiatives are bringing the possibility of developing future homes, offices, buildings, campuses, datacenters, ships...

  1. Pulsed dc self-sustained magnetron sputtering

    International Nuclear Information System (INIS)

    Wiatrowski, A.; Posadowski, W. M.; Radzimski, Z. J.

    2008-01-01

    The magnetron sputtering has become one of the commonly used techniques for industrial deposition of thin films and coatings due to its simplicity and reliability. At standard magnetron sputtering conditions (argon pressure of ∼0.5 Pa) inert gas particles (necessary to sustain discharge) are often entrapped in the deposited films. Inert gas contamination can be eliminated during the self-sustained magnetron sputtering (SSS) process, where the presence of the inert gas is not a necessary requirement. Moreover the SSS process that is possible due to the high degree of ionization of the sputtered material also gives a unique condition during the transport of sputtered particles to the substrate. So far it has been shown that the self-sustained mode of magnetron operation can be obtained using dc powering (dc-SSS) only. The main disadvantage of the dc-SSS process is its instability related to random arc formation. In such case the discharge has to be temporarily extinguished to prevent damaging both the magnetron source and power supply. The authors postulate that pulsed powering could protect the SSS process against arcs, similarly to reactive pulsed magnetron deposition processes of insulating thin films. To put this concept into practice, (i) the high enough plasma density has to be achieved and (ii) the type of pulsed powering has to be chosen taking plasma dynamics into account. In this article results of pulsed dc self-sustained magnetron sputtering (pulsed dc-SSS) are presented. The planar magnetron equipped with a 50 mm diameter and 6 mm thick copper target was used during the experiments. The maximum target power was about 11 kW, which corresponded to the target power density of ∼560 W/cm 2 . The magnetron operation was investigated as a function of pulse frequency (20-100 kHz) and pulse duty factor (50%-90%). The discharge (argon) extinction pressure level was determined for these conditions. The plasma emission spectra (400-410 nm range) and deposition

  2. Optimization of Shielded PCB Air-Core Toroids for High-Efficiency DC-DC Converters

    CERN Document Server

    Orlandi, S; Buso, S; Michelis, S; Fuentes, C A; Kayal, M; Faccio, F; Spiazzi, G

    2011-01-01

    The paper describes the design of optimized printed circuit board (PCB) air-core toroids for high-frequency dc-dc converters with strict requirements in terms of volume and noise. The effect of several design parameters on the overall inductor volume, on dc and ac winding resistance, and on the radiated noise will be investigated. PCB toroids are compared to standard air-core solenoids and other state-of-the-art air-core toroids both theoretically and experimentally: at first, using ANSOFT Maxwell and ANSOFT Q3D simulation tools, and subsequently, with laboratory measurements (irradiated noise, efficiency, and frequency response) on several prototypes. These very flexible and rather easy to manufacture inductors appear very attractive for compact high-frequency dc-dc converters where high efficiency, low volume, and low noise are of primary concern.

  3. A suitable model plant for control of the set fuel cell-DC/DC converter

    Energy Technology Data Exchange (ETDEWEB)

    Andujar, J.M.; Segura, F.; Vasallo, M.J. [Departamento de Ingenieria Electronica, Sistemas Informaticos y Automatica, E.P.S. La Rabida, Universidad de Huelva, Ctra. Huelva - Palos de la Frontera, S/N, 21819 La Rabida - Palos de la Frontera Huelva (Spain)

    2008-04-15

    In this work a state and transfer function model of the set made up of a proton exchange membrane (PEM) fuel cell and a DC/DC converter is developed. The set is modelled as a plant controlled by the converter duty cycle. In addition to allow setting the plant operating point at any point of its characteristic curve (two interesting points are maximum efficiency and maximum power points), this approach also allows the connection of the fuel cell to other energy generation and storage devices, given that, as they all usually share a single DC bus, a thorough control of the interconnected devices is required. First, the state and transfer function models of the fuel cell and the converter are obtained. Then, both models are related in order to achieve the fuel cell+DC/DC converter set (plant) model. The results of the theoretical developments are validated by simulation on a real fuel cell model. (author)

  4. Analysis of DC/DC Converter Efficiency for Energy Storage System Based on Bidirectional Fuel Cells

    DEFF Research Database (Denmark)

    Pittini, Riccardo; Zhang, Zhe; Andersen, Michael A. E.

    2013-01-01

    interface to the grid. In power electronics, the converter efficiency is characterized at fixed operating voltage for various output power. This type of characterization is not suitable for fuel cells, since as the power from the fuel cell increases, the cell voltage decreases. This paper analyses how......Renewable energy sources are fluctuating depending on the availability of the energy source. For this reason, energy storage is becoming more important and bidirectional fuel cells represent an attractive technology. Fuel cells require highcurrent low-voltage dc-dc or dc-ac converters as power...... the fuel cell I-V characteristics influences the power electronics converter efficiency and their consequence on the overall system. A loaddependent efficiency curve is presented based on experimental results from a 6 kW dc-dc converter prototype including the most suitable control strategy which maximizes...

  5. Operation and control of a DC-grid offshore wind farm under DC transmission system faults

    DEFF Research Database (Denmark)

    Deng, Fujin; Chen, Zhe

    2013-01-01

    . Consequently, the protection and control strategies of dc systems need to be established. This paper studies a dc-grid offshore wind farm, where the wind power collection system and power transmission system adopt dc technology. In this paper, the redundancy of the HVDC transmission system under faults...... is studied, and a fault ridethrough strategy for the dc-grid offshore wind farm is proposed. The proposed strategy can effectively minimize the impacts of the power transmission system disturbance on the offshore wind farm, and on the ac grid. A dc-grid offshore wind farm example is simulated with PSCAD....../EMTDC, and the results validate the feasibility of the presented redundancy configuration and operation approach, and the fault ridethrough control strategy....

  6. An Epidemiologic Analysis of Diabetes in Colombia.

    Science.gov (United States)

    Vargas-Uricoechea, Hernando; Casas-Figueroa, Luz Ángela

    2015-01-01

    The burden of diabetes is a global problem, wherein the significant growth of diabetes in Colombia reflects a complex pathophysiology and epidemiology found in many other South American nations. The aim of this study was to analyze epidemiologic data from Colombia and the South American region in general to identify certain disease drivers and target them for intervention to curb the increasing prevalence of diabetes. A detailed search was conducted using MEDLINE, SciELO, HINARI, LILACS, IMBIOMED, and Latindex databases, in addition to clinical practice guidelines, books, manuals, and other files containing relevant and verified information on diabetes in Colombia. According to the International Diabetes Federation and the World Health Organization, the prevalence of diabetes in Colombia is 7.1% and 8.5%, respectively. In contrast, a national survey in Colombia shows a prevalence ranging from 1.84% to 11.2%, depending on how the diagnosis is made, the criteria used, and the age range studied. The prevalence exclusively in rural areas ranges from 1.4% to 7.9% and in urban areas from 1% to 46%. The estimated mean overall (direct and indirect) cost attributed to type 2 diabetes is 5.7 billion Colombian pesos (US $2.7 million). Diabetes is the fifth leading cause of death in Colombia with a rate of 15 deaths per 100,000 individuals. Based on a clustering of factors, 4 relevant disease drivers emerge that may account for the epidemiology of diabetes in Colombia: demographic transition, nutritional transition, forced displacement/internal migration and urban development, and promotion of physical activity. Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved.

  7. Contribución al estudio de la biología y capacidad de control de Encarsia Formosa Gahan en la Sabana de Bogotá Biology ano control activity ,of Encarsia formosa Gahan in Bogota (Colombia

    Directory of Open Access Journals (Sweden)

    Español Jeannette Amparo

    1988-12-01

    Full Text Available Con la introducción de Encarsia formosa Ganan.(Hvrnenóptero-Aphelinidae, parásito espec ífico de la mosca blanca Trisleurodes vaporariorum (Westwood Ouaintance
    & Baker, se realizó un estudio de biología, comportamiento y adaptación del parásito en condiciones de laboratorio e invernadero a nivel de la Sabana de Bogotá, A partir de las primeras liberaciones de Encsrsie, se observó una buena capacidad de búsqueda, dispersión, adaptación y eficiencia
    de control sobre la mayoría de hospederos vegetales muestreados, En condiciones de la boratorio sobre plantas de tomate, se obtuvo una fecundidad promedia de 63 huevos/
    hembra/20 días, una longevidad promedia de 41,4 días, una relación de sexos de 361: 1 Hembras/macho, una duración del ciclo de vida de 22,1 días cuando parasitó ninfas en tercer instar y de 12,7 días cuando parasitó ninfas de mosca blanca en cuarto instar, En la evaluación del control ejercido sobre las ninfas de mosca blanca en plantas de tomate se determinó un mayor porcentaje de parasitismo en los folíolos medios y apicales y un mayor porcentaje de predación en los folíolos basales, En cuanto al control ejercido por Encarsia formosa sobre plantas de tomate y tabaco en laboratorio y tomate,  milflores y alstroemeria bajo condiciones de
    invernadero y sometidas a libre infestación de la plaga y el parásito se determinó un buen control expresado en un alto porcentaje de parasitismo superior al 70% y un bajo
    porcentaje de predación.
    Some preliminary studies on behavior and adaptation of the newly introduced Encarsia formosa Gahan as a parasite of the greenhouse whitefly Trisleurodes vaporariorum (Westwood under laboratory and greenhouse conditions were determined. Different plant hosts of T. vaporariorum were considered. Using tomato as a host for the greenhouse whitefly it was found that E. formosa showed and average
    fecundity of 63 eggs per female in 20 days, an adult longevity of 41,4 days, a sexual ratio of 361 females to 1 male and alife
    cycle of 22,1 days when paresitation occurred on the third instar of T. vaporariorum and 12,7 days when parasitation was on the fourth instar. Greater rate of parasitism was found on the middle and upper third of the tomato plant and a greater rate of predation was observed on the lower third of the tomato plant. E. formosa showed a parásitation rate higher than 70% on the total number of greenhouse whitefly nymhs when measured on tomato and tobbaco under
    laboratory conditions and on alstroemeria under greenhouse conditions.

  8. Research borehole drilling activity for boreholes DH-18, DH-19, DC-12, DC-13, DC-14, DC-15, and deepening of existing borehole DC-7

    International Nuclear Information System (INIS)

    1979-09-01

    This report is an environmental evaluation of the impacts of proposed borehole drilling activities at the Hanford Site, northwest of Richland, Washington. The proposed action is to drill six research boreholes ranging in depth from 137 to 1372 meters (m) [250 to 4500 +- feet (ft)]. In addition, an existing borehole (DC-7) will be extended from 1249 to 1524 m (4099 to 5000 +- ft). The purpose of the US Department of Energy's (DOE) borehole drilling activities is to collect data on in situ rock formations that are considered potentialy suitable for nuclear waste repositories. The technical program efforts necessary to identify and qualify specific underground waste facility sites in candidate rock formations include geologic and hydrologic studies (seismicity and tectonics, rock structure and stratigraphy, lithology, etc.). Borehole drilling is an integral part of the geological studies and is essential to a thorough understanding of potentially suitable geologic formations. The purpose of the proposed drilling activities is to obtain data for evaluating Columbia River basalts that are being evaluated by the National Waste Terminal Storage (NWTS) Program to determine their suitability potential for nuclear waste repositories. Unavoidable impact to the environment is limited primarily to the clearing of land needed for access and drilling operations. Considerations exercised during site preparation, drilling, and subsequent site restoration will limit modification of the natural environment to the minimum required for accomplishment of test objectives

  9. Current state of uranium exploration in central Colombia: Regional perspective and selected case studies

    International Nuclear Information System (INIS)

    Moreno, G.; Perez, A.

    2014-01-01

    The Colombian Geological Survey has been working in a regional exploration program focus on the ancients massifs of the Eastern Cordillera. The general geology distribution in these massifs (Santander and Quetame) includes a core of meta sedimentary to medium grade metamorphic rocks of pellitic origin presumed to be of Cambro – Ordovician age, intruded by Ordovician age plutons that grade from granodiorite to quartz diorite. This igneous – metamorphic core is unconformable overlain by a Devonian age sedimentary cover that includes conglomerates of continental origin, black mudstone of marine origin and red sandstones of deltaic environments with some calcareous intervals. In the Santander Massif a sequence of continental red beds of Jurasic age is present and in the Zapatoca (Santander) area contains uranium. In the Santander Massif, mineral exploration in an area on 1300 km 2 with 1235 sample locations, gives average uranium values of 5.44 ppm, an a maximum of 20 ppm, located in Ordovician plutonic rocks. In the Quetame Massif, mineral exploration in an area on 1000 km 2 with 1274 samples locations, gives average uranium values of 6.13 ppm, and a maximum of 2763 ppm, located in Devonian to Carboniferous sedimentary rocks. In the Paipa area, 140 kilometers from Bogota, the Colombian Geological Survey has undertaken exploratory drilling. As a result there is an anomalous area of 500 m 2 with values of 2000 ppm uranium and rare earth associations has been identified. The volcanic system has been studied by several authors and is important for its location and extention. In recent years, exploration by private companies was reactivated. In early 2000 several junior companies such as KPS/Energentia Resources Inc., Mega Uranium, U3O8 Corp, Energentia Resources Inc., Blue Sky Uranium Corp, Sprott Resource Corp. and UrAmericaLtd and began exploratory work in Colombia. The Berlin project, located in the central mountain range, is perhaps the most developed in the

  10. New Experimental Data in DC745U

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz-Acosta, Denisse [Los Alamos National Laboratory; Cady, Carl [Los Alamos National Laboratory; Densmore, Crystal [Los Alamos National Laboratory

    2012-06-18

    The objectives of this project are: (1) study the molecular and mechanical properties of DC745U - (a) DC745U is a silicone elastomer used in several weapons systems, (b) depending on their chemistry and formulation, polymers can be susceptible to damage and failures due to weak chemical linkages and physical interactions, (c) inefficient production processes can generate heterogeneities throughout the material that can contribute negatively to the overall performance and lifetime of the polyer, (d) aging, long-term thermal and radioactive conditions, and mechanical strains can affect the materials network structure and contribute to the degradation of the production; (2) characterization of DC745U materials cured under different conditions to determine possible differences to the polymer structure; and (3) this work is relevant to mission-critical programs and for supporting programmatic work for weapon research.

  11. All projects related to Colombia | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Security for women and the lesbian, gay, bisexual, transgender and intersex people in the conflict-affected regions in Colombia. Project. Colombia is currently in the process of concluding peace negotiations with the guerrilla group Colombian Revolutionary Armed Forces (FARC). Region: Colombia. Program: Governance ...

  12. 77 FR 74918 - Unblocking of Specially Designated Nationals and Blocked Persons Pursuant to Executive Order 12978

    Science.gov (United States)

    2012-12-18

    ..., Estado de Mexico C.P. 56580, Mexico; R.F.C. IPU-030318-C6A (Mexico) [SDNT]. 6. INVERSIONES FLOREZ Y.... 806, Bogota, Colombia; c/o COLOMBO ANDINA COMERCIAL COALSA LTDA., Bogota, Colombia; c/o INVERSIONES..., Elkin de Jesus, c/o FLOREZ HERMANOS LTDA., Medellin, Colombia; c/o INVERSIONES FLOREZ Y FLOREZ Y CIA S.C...

  13. 75 FR 27118 - Additional Designations, Foreign Narcotics Kingpin Designation Act

    Science.gov (United States)

    2010-05-13

    ... VALORES INTEGRADOS LTDA, Bogota, Colombia; c/o JUAN SEBASTIAN Y CAMILA ANDREA JIMENEZ RAMIREZ Y CIA S.C.S.../o MERCADO DE VALORES INTEGRADOS LTDA, Bogota, Colombia; c/o JUAN SEBASTIAN Y CAMILA ANDREA JIMENEZ... (Colombia); (ENTITY) [SDNTK] 6. MERCADO DE VALORES INTEGRADOS LTDA (a.k.a. VALINTEGRADOS LTDA); Calle 24D...

  14. Strategi Counterinsurgency Kolombia terhadap Farc (Fuerzas Armadas Revolucionarias De Colombia) 2010-2012

    OpenAIRE

    Olivia, Yessi; Miranda, Dea

    2014-01-01

    This paper is analysing about counterinsurgency Colombia to against paramilitary group in Colombia to help address the humanitarian crisis that occurred because of civil conflict in Colombia. Conflict in Colombia involving the Fuerzas Armadas Revolucionaries de Colombia (FARC) and the Government of Colombia is one example of a threat to human security in this case is a citizen of Colombia. Thousands of people confirmed dead, and hundreds more injured and displaced into the surrounding area. C...

  15. C-type lectin DC-SIGN

    OpenAIRE

    Jeras, Matjaž; Švajger, Urban; Obermajer, Nataša; Anderluh, Marko

    2015-01-01

    The dendritic cell-specific intercellular adhesion molecule-3-grabbing non-integrin (DC SIGN) is a type II C-type lectin whose expression is restricted to the most potent antigen-presenting cells (APCs), the dendritic cells (DCs). In recent years, DC-SIGN has gained an exponential increase in attention because of its involvement in multiple aspects of immune function. Besides being an adhesion molecule, particularly in binding ICAM-2 and ICAM-3,it is also crucial in recognizing several endoge...

  16. Three phase full wave dc motor decoder

    Science.gov (United States)

    Studer, P. A. (Inventor)

    1977-01-01

    A three phase decoder for dc motors is disclosed which employs an extremely simple six transistor circuit to derive six properly phased output signals for fullwave operation of dc motors. Six decoding transistors are coupled at their base-emitter junctions across a resistor network arranged in a delta configuration. Each point of the delta configuration is coupled to one of three position sensors which sense the rotational position of the motor. A second embodiment of the invention is disclosed in which photo-optical isolators are used in place of the decoding transistors.

  17. DC Motor Drive with PFC Rectifier

    Directory of Open Access Journals (Sweden)

    Lascu Mihaela

    2008-05-01

    Full Text Available The goal of this work is to study theperformances of a hybrid controller used to controlDC Motor drive with a single-phase power factorcorrection rectifier. This study is made usingcomputer simulation (Simulink. The first part isdevoted to the control system of the DC Motors. Inthe second part, the design of the hybrid controllerwill be presented. The third part is the design ofthe fast response single-phase boost power factorcorrection rectifier. The last parts are devoted tosimulation and experimental results.

  18. RF and dc desensitized electroexplosive device

    Science.gov (United States)

    Krainiak, John W.; Speaks, Paul D.; Cornett, Michael S.

    1989-07-01

    This patent application relates to electroexplosive devices (EEDs) such as detonators, blasting caps and squibs, in particular to a method and device for desensitizing EEDs to electromagnetic radiation and electrostatic charges with the added ability to desensitize the device to essentially dc currents. An insensitive electroexplosive device to electrically ignite explosive is disclosed. This device is inherently immune to radio frequency (RF) radiation, and also provides protection against dc or very low frequency RF induced by arcing. A central feature is use of zeners and capacitors to form a reactively balanced bridge circuit. When constructed in semiconductor form, as described in this application, the device is capable of incorporation in small caliber ordnance.

  19. A Feed-Forward Control Realizing Fast Response for Three-Branch Interleaved DC-DC Converter in DC Microgrid

    DEFF Research Database (Denmark)

    Wang, Haojie; Han, Minxiao; Yan, Wenli

    2016-01-01

    for storage batteries in DC microgrids. The working principle of TIDC is analyzed, and the factors influencing the response rate based on the dual-loop constant voltage control for TIDC are discussed, and then the method of feed-forward control for TIDC is studied to improve the response rate for load...

  20. Homopolar dc motor and trapped flux brushless dc motor using high temperature superconductor materials

    Science.gov (United States)

    Crapo, Alan D.; Lloyd, Jerry D.

    1991-03-01

    Two motors have been designed and built for use with high-temperature superconductor (HTSC) materials. They are a homopolar dc motor that uses HTSC field windings and a brushless dc motor that uses bulk HTSC materials to trap flux in steel rotor poles. The HTSC field windings of the homopolar dc motor are designed to operate at 1000 A/sq cm in a 0.010-T field. In order to maximize torque in the homopolar dc motor, an iron magnetic circuit with small air gaps gives maximum flux for minimum Ampere turns in the field. A copper field winding version of the homopolar dc motor has been tested while waiting for 575 A turn HTSC coils. The trapped flux brushless dc motor has been built and is ready to test melt textured bulk HTSC rings that are currently being prepared. The stator of the trapped flux motor will impress a magnetic field in the steel rotor poles with warm HTSC bulk rings. The rings are then cooled to 77 K to trap the flux in the rotor. The motor can then operate as a brushless dc motor.

  1. Design and modelling of high gain DC-DC converters for fuel cell hybrid electric vehicles

    Science.gov (United States)

    Elangovan, D.; Karthigeyan, V.; Subhanu, B.; Ashwin, M.; Arunkumar, G.

    2017-11-01

    Transportation (Diesel and petrol internal combustion engine vehicles) approximately contributes to 25.5% of total CO2 emission. Thus diesel and petrol engine vehicles are the most dominant contributors of CO2 emission which leads global warming which causes climate change. The problem of CO2 emission and global warming can be reduced by focusing on renewable energy vehicles. Out of the available renewable energy sources fuel cell is the only source which has reasonable efficiency and can be used in vehicles. But the main disadvantage of fuel cell is its slow response time. So energy storage systems like batteries and super capacitors are used in parallel with the fuel cell. Fuel cell is used during steady state vehicle operation while during transient conditions like starting, acceleration and braking batteries and super capacitors can supply or absorb energy. In this paper a unidirectional fuel cell DC-DC converter and bidirectional energy storage system DC-DC converter is proposed, which can interface dc sources at different voltage levels to the dc bus and also it can independently control the power flow from each energy source to the dc bus and vice versa. The proposed converters are designed and simulated using PSIM version 9.1.1 and gate pulse pattern, input and output voltage waveforms of the converters for steady state operation are studied.

  2. los pobres de barranquilla (Colombia

    Directory of Open Access Journals (Sweden)

    José Luis Ramos R.

    2007-01-01

    Full Text Available En esta investigación se analizan las características socioeconómicas relevantes que tiene la población pobre del distrito de Barranquilla (Colombia, y se destacan en el análisis las aspiraciones y la percepción que estas personas tienen sobre las instituciones de carácter público que se dedican a atender las demandas sociales. El estudio examina la relación entre los ciudadanos menos favorecidos y la institucionalidad social en sus múltiples manifestaciones y dimensiones, siguiendo los preceptos de la teoría institucional. Metodológicamente el estudio responde a un diseño cualitativocuantitativo, de carácter descriptivo-analítico. Para la interpretación de la información recogida a través de las encuestas se realizó un análisis de correspondencias múltiples.

  3. Timeline: environmental education in Colombia

    Directory of Open Access Journals (Sweden)

    Luz Adriana Pita-Morales

    2016-12-01

    Full Text Available The environmental education is a process that allows the individual to understand the relations of interdependence with the environment in the one that develops, is like that, since the reality bears biophysics in mind, social, political, economic in this respect it is necessary to generate in the company activities of valuation and respect for the environment. The environmental education is a dynamic and participative process orientated to the formation of critical and reflexive persons with aptitude to understand the environmental problematics of the local, regional and national context. In this frame the need is born of contextualized the labor that has become national in the construction of instruments that allow him the condition to look at the environmental education as a fundamental tool for the care of the natural resources and not as an isolated concept foreign to the community. In the present review their approaches the historical frame of the environmental education in Colombia his challenges, challenges and the way like are opening formative spaces and of projection for the suitable managing of the environment. In conclusion environmental education is a participatory process that must be born of the group in order to give management the natural resources of a region and community where professionals to do is oriental these processes in society.

  4. en Colombia, 2002-2012

    Directory of Open Access Journals (Sweden)

    Camilo Tamayo

    2014-01-01

    Full Text Available El presente artículo ofrece una mirada interpretativa de las principales ten- dencias que han guiado el estudio sobre la relación entre los medios de co- municación, el periodismo y la confrontación armada en Colombia entre 2002 y 2012. ¿Cuál es la agenda investigativa que la academia, las organiza- ciones sociales y de periodistas han elaborado sobre esta problemática? El estudio reúne 89 trabajos que se pueden agrupar en tres tendencias prin- cipales: las miradas al oficio: riesgos, libertades y garantías para informar en medio del conflicto; las agendas del conflicto: fuentes, lenguajes y pú- blicos de la información, y los escenarios emergentes: (posconflicto, víc- timas y memoria. El artículo cierra con 12 aprendizajes que resultaron de la interpretación de las tendencias encontradas, y que pretenden propiciar puntos de atención sobre los lugares de mirada del periodismo, la academia y las organizaciones de la sociedad en contextos de conflicto armado.

  5. The coal sector in Colombia

    International Nuclear Information System (INIS)

    Anon

    1998-01-01

    Inside the plan of development of the sub-sector coal, implemented by the Ministry of Mines and Energy, has like one of the objectives to achieve that in the year 2001, this is the energy second in order of importance for the consumption of the country, overcome alone for the petroleum and their derived. The consumption of this energy in Colombia has shown a stable behavior in the last 15 years, period in which incursions of the coal have not been observed in new markets of the national economy, having a growth of so single 2.1% a year. Inside the plan of development of the sub-sector coal, implemented by the Ministry of Mines and Energy, the coal is had as one of the objectives to achieve that in the year 2001, this it is the energy second in order of importance for the consumption of the country, overcome alone for the petroleum and their derived. The author also refers to the role of the state; the coal in the national economy and it shows charts related with the exports and demand, among other items

  6. Comparison of solar panel cooling system by using dc brushless fan and dc water

    International Nuclear Information System (INIS)

    Irwan, Y M; Leow, W Z; Irwanto, M; M, Fareq; Hassan, S I S; Amelia, A R; Safwati, I

    2015-01-01

    The purpose of this article is to discuss comparison of solar panel cooling system by using DC brushless fan and DC water pump. Solar photovoltaic (PV) power generation is an interesting technique to reduce non-renewable energy consumption and as a renewable energy. The temperature of PV modules increases when it absorbs solar radiation, causing a decrease in efficiency. A solar cooling system is design, construct and experimentally researched within this work. To make an effort to cool the PV module, Direct Current (DC) brushless fan and DC water pump with inlet/outlet manifold are designed for constant air movement and water flow circulation at the back side and front side of PV module representatively. Temperature sensors were installed on the PV module to detect temperature of PV. PIC microcontroller was used to control the DC brushless fan and water pump for switch ON or OFF depend on the temperature of PV module automatically. The performance with and without cooling system are shown in this experiment. The PV module with DC water pump cooling system increase 3.52%, 36.27%, 38.98%in term of output voltage, output current, output power respectively. It decrease 6.36 °C compare than to PV module without DC water pump cooling system. While DC brushless fan cooling system increase 3.47%, 29.55%, 32.23%in term of output voltage, output current, and output power respectively. It decrease 6.1 °C compare than to PV module without DC brushless fan cooling system. The efficiency of PV module with cooling system was increasing compared to PV module without cooling system; this is because the ambient temperature dropped significantly. The higher efficiency of PV cell, the payback period of the system can be shorted and the lifespan of PV module can also be longer. (paper)

  7. Comparison of solar panel cooling system by using dc brushless fan and dc water

    Science.gov (United States)

    Irwan, Y. M.; Leow, W. Z.; Irwanto, M.; M, Fareq; Hassan, S. I. S.; Safwati, I.; Amelia, A. R.

    2015-06-01

    The purpose of this article is to discuss comparison of solar panel cooling system by using DC brushless fan and DC water pump. Solar photovoltaic (PV) power generation is an interesting technique to reduce non-renewable energy consumption and as a renewable energy. The temperature of PV modules increases when it absorbs solar radiation, causing a decrease in efficiency. A solar cooling system is design, construct and experimentally researched within this work. To make an effort to cool the PV module, Direct Current (DC) brushless fan and DC water pump with inlet/outlet manifold are designed for constant air movement and water flow circulation at the back side and front side of PV module representatively. Temperature sensors were installed on the PV module to detect temperature of PV. PIC microcontroller was used to control the DC brushless fan and water pump for switch ON or OFF depend on the temperature of PV module automatically. The performance with and without cooling system are shown in this experiment. The PV module with DC water pump cooling system increase 3.52%, 36.27%, 38.98%in term of output voltage, output current, output power respectively. It decrease 6.36 °C compare than to PV module without DC water pump cooling system. While DC brushless fan cooling system increase 3.47%, 29.55%, 32.23%in term of output voltage, output current, and output power respectively. It decrease 6.1 °C compare than to PV module without DC brushless fan cooling system. The efficiency of PV module with cooling system was increasing compared to PV module without cooling system; this is because the ambient temperature dropped significantly. The higher efficiency of PV cell, the payback period of the system can be shorted and the lifespan of PV module can also be longer.

  8. Medidas de control de tuberculosis en una institución de salud de Bogotá D.C

    Directory of Open Access Journals (Sweden)

    Alba I. Muñoz-Sánchez

    2016-02-01

    Full Text Available Resumen Objetivo: evaluar la implementación de medidas de control, de tipo administrativo, ambiental y de protección respiratoria, de la infección de tuberculosis en un hospital de III nivel de atención en la ciudad de Bogotá D.C. Metodología: estudio de tipo descriptivo, transversal. Para la recolección de datos se aplicó una herramienta de autorreporte a 158 trabajadores de la salud del hospital, se realizó una entrevista estructurada al responsable del programa institucional de control de tuberculosis y una visita de observación de un experto en salud y seguridad laboral a las diferentes áreas de trabajo, para indagar por la implementación de medidas de control de infección de tuberculosis en la institución. Resultados: el responsable del programa institucional de control de tuberculosis y 158 trabajadores de la salud del hospital objeto de estudio reportaron una deficiente implementación de medidas de control de tuberculosis, de tipo administrativo, ambiental y de protección respiratoria en la institución, lo cual fue corroborado por el experto. Conclusiones: la deficiente implementación de medidas de control de infección de tuberculosis en instituciones de la salud, y algunas condiciones de trabajo presentes pueden favorecer la exposición ocupacional de los trabajadores de la salud al Mycobacterium Tuberculosis. Abstract Objective: to evaluate the implementation of tuberculosis infection control measures in administrative, environmental and respiratory protection equipment in a third level hospital in Bogota D.C. Methodology: a descriptive, cross-sectional study. Data were collected through a self-reporting instrument applied on 158 health care workers. The chief officer of the institutional program for tuberculosis control participated in a structured interview. In addition, an expert in occupational health and safety conducted an observational visit to the different workplaces in order to inquire on the implementation

  9. Transition towards DC micro grids: From an AC to a hybrid AC and DC energy infrastructure

    Directory of Open Access Journals (Sweden)

    Evi Ploumpidou

    2017-12-01

    Full Text Available Our electricity is predominantly powered by alternating current (AC, ever since the War of Currents ended in the favor of Nicola Tesla at the end of the 19th century. However, lots of the appliances we use, such as electronics and lights with light-emitting diode (LED technology, work internally on direct current (DC and it is projected that the number of these appliances will increase in the near future. Another contributor to the increase in DC consumption is the ongoing electrification of mobility (Electric Vehicles (EVs. At the same time, photovoltaics (PV generate DC voltages, while the most common storage technologies also use DC. In order to integrate all these appliances and technologies to the existing AC grid, there is a need for converters which introduce power losses. By distributing DC power to DC devices instead of converting it to AC first, it is possible to avoid substantial energy losses that occur every time electricity is converted. This situation initiated the concept for the implementation of the DC-Flexhouse project. A prototype DC installation will be developed and tested in one of the buildings of the developing living lab area called the District of Tomorrow (De Wijk van Morgen which is located in Heerlen, the Netherlands. A neighborhood cooperative (Vrieheide cooperatie is also part of the consortium in order to address the aspect of social acceptance. Although DC seems to be a promising solution for a more sustainable energy system, the business case is still debatable due to both technology- and market-related challenges. The current energy infrastructure is predominantly based on AC, manufacturers produce devices based on AC standards and people are using many AC products across a long life span. This Smart Energy Buildings & Cities (SEB&C PDEng project is a contribution to the DC-Flexhouse project. The aim is to analyze the challenges in the transition to DC micro grids, assess the market potential of DC

  10. Properties of DLC coatings deposited by dc and dc with superimposed pulsed vacuum arc

    International Nuclear Information System (INIS)

    Zavaleyev, V.; Walkowicz, J.; Aksyonov, D.S.; Luchaninov, A.A.; Reshetnyak, E.N.; Strel'nitskij, V.E.

    2014-01-01

    Comparative studies of the structure, mechanical and tribological properties of DLC coatings deposited in DC and DC with superimposed high current pulse modes of operation vacuum-arc plasma source with the graphite cathode are presented. Imposition the pulses of high current on DC vacuum-arc discharge allows both increase the deposition rate of DLC coating and reduce the residual compressive stress in the coatings what promotes substantial improvement the adhesion to the substrate. Effect of vacuum arc plasma filtration with Venetian blind filter on the deposition rate and tribological characteristics of the coatings analyzed.

  11. The century of the Petroleum in Colombia

    International Nuclear Information System (INIS)

    Carta Petrolera

    1999-01-01

    A recount of the big changes is made with hydrocarbons in Colombia during the X X century. The X X century it meant everything for Colombia in oil matter. In this century it took off and it consolidated their industry of the hydrocarbons and with her great part of the industrialization process and development of the country. It is undeniable that the petroleum was one of the big main characters of the century X X and Colombia has not been unaware to the sways of a highly changing industry. The creation of the OPEC, the warlike conflicts, the times of high and low prices, the technological advances, the processes of energy integration and the mega coalitions are hardly some of the ingredients that seasoned the Oil Industry in the years 1900

  12. Power Quality in DC Power Distribution Systems and Microgrids

    Directory of Open Access Journals (Sweden)

    Stephen Whaite

    2015-05-01

    Full Text Available This review paper discusses power quality considerations for direct current (DC electric power distribution systems, particularly DC microgrids. First, four selected sample DC architectures are discussed to provide motivation for the consideration of power quality in DC systems. Second, a brief overview of power quality challenges in conventional alternating current (AC distribution systems is given to establish the field of power quality. Finally, a survey of literature addressing power quality issues in DC systems is presented, and necessary power quality considerations in DC distribution system design and operation are discussed.

  13. Modeling and simulation for micro DC motor based on simulink

    Science.gov (United States)

    Shen, Hanxin; Lei, Qiao; Chen, Wenxiang

    2017-09-01

    The micro DC motor has a large market demand but there is a lack of theoretical research for it. Through detailed analysis of the commutation process of micro DC motor commutator, based on micro DC motor electromagnetic torque equation and mechanical torque equation, with the help of Simulink toolkit, a triangle connection micro DC motor simulation model is established. By using the model, a sample micro DC motor are simulated, and an experimental measurements has been carried on the sample micro DC motor. It is found that the simulation results are consistent with theoretical analysis and experimental results.

  14. Hierarchical Control for Multiple DC-Microgrids Clusters

    DEFF Research Database (Denmark)

    Shafiee, Qobad; Dragicevic, Tomislav; Vasquez, Juan Carlos

    2014-01-01

    DC microgrids (MGs) have gained research interest during the recent years because of many potential advantages as compared to the ac system. To ensure reliable operation of a low-voltage dc MG as well as its intelligent operation with the other DC MGs, a hierarchical control is proposed in this p......DC microgrids (MGs) have gained research interest during the recent years because of many potential advantages as compared to the ac system. To ensure reliable operation of a low-voltage dc MG as well as its intelligent operation with the other DC MGs, a hierarchical control is proposed...

  15. Sistema de salud de Colombia The health system of Colombia

    Directory of Open Access Journals (Sweden)

    Ramiro Guerrero

    2011-01-01

    Full Text Available En este trabajo se presenta una breve descripción de las condiciones de salud de Colombia y una descripción detallada del sistema colombiano de salud. Esta última incluye una descripción de su estructura y cobertura, sus fuentes de financiamiento, el gasto en salud, los recursos con los que cuenta, quién vigila y evalúa al sector salud y qué herramientas de participación tienen los usuarios. Dentro de las innovaciones más recientes del sistema se incluyen las modificaciones al Plan Obligatorio de Salud y a los montos de la unidad de pago por capitación, la integración vertical entre empresas promotoras de salud y las instituciones prestadoras de servicios, así como el establecimiento de nuevas fuentes de recursos para lograr la universalidad e igualar los planes de beneficios entre los distintos regímenes.This document briefly describes the health conditions of the Colombian population and, in more detail, the characteristics of the Colombian health system. The description of the system includes its structure and coverage; financing sources; expenditure in health; physical material and human resources available; monitoring and evaluation procedures; and mechanisms through which the population participates in the evaluation of the system. Salient among the most recent innovations implemented in the Colombian health system are the modification of the Compulsory Health Plan and the capitation payment unit, the vertical integration of the health promotion enterprises and the institutions in charge of the provision of services and the mobilization of additional resources to meet the objectives of universal coverage and the homologation of health benefits among health regimes.

  16. New Logic Circuit with DC Parametric Excitation

    Science.gov (United States)

    Sugahara, Masanori; Kaneda, Hisayoshi

    1982-12-01

    It is shown that dc parametric excitation is possible in a circuit named JUDO, which is composed of two resistively-connected Josephson junctions. Simulation study proves that the circuit has large gain and properties suitable for the construction of small, high-speed logic circuits.

  17. Intelligent Power Control of DC Microgrid

    DEFF Research Database (Denmark)

    Hajizadeh, Amin; N. Soltani, Mohsen; Norum, Lars

    2017-01-01

    In this paper, an intelligent power management strategy is proposed for hybrid DC microgrid, including wind turbine, fuel cell and battery energy storage. The considered wind turbine has a permanent magnet synchronous generator (PMSG). In the considered structure, wind turbine operates as the main...

  18. Protection of AC and DC Microgrids

    DEFF Research Database (Denmark)

    Beheshtaein, Siavash; Savaghebi, Mehdi; Quintero, Juan Carlos Vasquez

    2015-01-01

    and DC microgrids, and then investigates the existing and promising solutions for the corresponding challenges. To the authors’ knowledge, three parts of smart grids are required to be developed to facilitate implementation of protection scheme in microgrids. The main requirements and open issues...

  19. Gravity Compensation Technique Uses Small dc Motor

    Science.gov (United States)

    Hollow, Richard

    1988-01-01

    Small dc servomotor powered by simple constant-current source and with suitable gearing used to cancel effect of gravity upon load. Lead-screw positioning system has load counterbalanced by small supplementary motor powered by constant current source. Motor lighter and more compact alternative to counterbalance. Used in variety of mechanical systems where load positioned or accelerated in vertical plane.

  20. Computerized Torque Control for Large dc Motors

    Science.gov (United States)

    Willett, Richard M.; Carroll, Michael J.; Geiger, Ronald V.

    1987-01-01

    Speed and torque ranges in generator mode extended. System of shunt resistors, electronic switches, and pulse-width modulation controls torque exerted by large, three-phase, electronically commutated dc motor. Particularly useful for motor operating in generator mode because it extends operating range to low torque and high speed.