bluuebunny/crossref_metadata_2025 huggingface dataset:
Aplicación de indicadores de conocimiento sobre biodiversidad para el diagnóstico y comparación de colecciones biológicas.
Authors: Vallejo Martha Yaneth , Acosta Rueda PhD José Alberto
Published: May 2017

La mayoría de colecciones biológicas de los museos en Colombia carecen de elementos de diagnóstico, lo que impide analizarlas y determinar su estado en términos cuantitativos y cualitativos. Para suplir esta carencia se proponen indicadores de biodiversidad aplicables a las bases de datos de las colecciones biológicas que permitan a los museos definir sus condiciones, prioridades y registrar su aporte a la biodiversidad. Es así, como existen criterios básicos para elaborar dichos indicadores: validez científica, disponibilidad y fiabilidad de los datos, este último incluye; representatividad, sensibilidad a cambios, sencillez, comparabilidad, relevancia y utilidad entre otros. Estos criterios son necesarios para soportar cada indicador como parte de la hoja metodológica.Los indicadores de conocimiento sobre biodiversidad propuestos sirven para comparar el mismo grupo biológico: (i) entre diferentes colecciones, como el caso de estudio escleractinios del Museo Javeriano – MUJ y Museo de Historia Natural Marina de Colombia- MHNMC; (ii) comparar una colección frente a un total reportado para el país o el mundo. Los indicadores usados fueron los de: representatividad y complementariedad, tanto taxonómica como geográfica, especies en peligro, identificación taxonómica, completitud de datos, intensidad de muestreo e índice de metadatos. Los indicadores utilizados arrojaron los siguientes resultados para la colección del MUJ: especies con las que cuenta, 30 corales hermatípicos; carece de, 52 corales ahermatípicos en muestreos en 3 ecorregiones del país; distribución temporal de colecta, 91.6% de las colectas recientes; distribución espacial de colecta, 6 ecorregiones a lo largo del Caribe colombiano; representatividad taxonómica 50% frente al MHNMC y 26% frente al total reportado en el Caribe; nivel de curatoría, 94.4% de ejemplares identificados hasta especie; especies en amenaza presentes, 17.6%; familia con mas repeticiones, Faviidae y mas representativa, Agariciidae. El uso de indicadores incrementa la utilización y divulgación de la biodiversidad de un país y permite la especialización de la colección a través de la información documentada, permitiendo a los museos generar un diagnostico por colección y establecer prioridades de manejo y optimización de los recursos económicos.
Estrategias diagnósticas utilizadas para detectar deficiencias de hierro subclínicas y asociadas a enfermedades crónicas
Authors: Coy Velandia, MSC Luz Stella , Castillo Bohórquez, MSC Martha , Mora Bautista, MSC Ana Isabel , Oliveros R. MSC Ana Lucía , Vélez Zulay
Published: May 2017

La homeostasis y las variaciones fisiológicas horarias en el metabolismo del hierro se constituyen en verdaderos desafíos para los expertos, quienes intentan diseñar pruebas altamente sensibles y específicas que cuantifiquen los niveles circulantes y de depósito de este elemento, su repercusión en la eritropoyesis, cuantificación de las proteínas, transportadores y receptores involucrados en el proceso, a fin de descartar la presencia de estados carenciales. Las deficiencias de hierro pasan por tres fases; las dos primeras son las más difíciles de identificar porque son subclínicas, más aún, cuando pueden cursar simultáneamente con enfermedades crónicas inflamatorias, infecciosas y neoplásicas que de por sí son anemizantes. En este trabajo se revisarán las principales pruebas de laboratorio utilizadas para la identificación de deficiencias de hierro, sensibilidad, especificidad, ventajas y limitaciones para su uso
Lista de corales hermatípicos del Museo Javeriano de Historia Natural Lorenzo Uribe S.J., Colombia
Authors: Acosta Rueda, PhD José Alberto , Vallejo Martha Yaneth
Published: May 2017

Las colecciones biológicas de diferentes museos en un país son material complementario que sirven para estudios e investigaciones sobre biodiversidad, ya que además de la información sobre los especimenes preservados, ofrecen instrumentos para crear vínculos y relaciones entre sí. La presente nota, ilustra la importancia de la complementariedad entre colecciones: Museo Javeriano; MUJ y Museo de Historia Natural Marino de Colombia; MHNMC, para un mismo grupo biológico, los corales hermatípicos. La nomenclatura de especies utilizadas fue siguiendo a Veron (2000). El MUJ busca participar con su colección de referencia (29 especies, 129 registros biológicos) en proyectos nacionales e internacionales, compartiendo información, para de esta manera aportar al conocimiento y estudio de la biodiversidad.
Memorias del III Simposio Nacional y I Internacional de Actualización e Investigación en Ciencias Biomédicas
Authors: NOVA Editor
Published: May 2017

La Revista NOVA en formato electrónico publica los resúmenes de las conferencias magistrales de los módulos de genética, bioquímica, bioinformática, microbiología, parasitología, bioética y los resúmenes de los trabajos libres.En formato impreso encontrará las memorias publicadas así:el volumen 4: Resúmenes de trabajos libres. 2. En el volumen 5: Resúmenes de conferencias de los módulos de genética, bioquímica y bioinformática. 3. En el volumen 6: Resúmenes de las conferencias de los módulos de microbiología, parasitología y bioética.Este evento se llevó acabo en el mes de agosto de 2005 y fue organizado por la Universidad de la Sabana, la Universidad Colegio de Cundinamarca, la Universidad de Los Andes, la Universidad INCCA de Colombia, la Asociación Colombiana de Genética Humana – Grupo de Mutagénesis y Carcinogénesis y la Asociación Colombiana de Ciencias Biológicas
Construcción de una base de datos electrocardiográfica para caninos residentes en Bogotá, con apoyo ecocardiográfico
Authors: Ortega Mauricio , Gómez Leonardo , Cerquera Alexander , Gutiérrez Rafael
Published: May 2017

El siguiente trabajo presenta la base de datos VETUAN_I, de medidas obtenidas en datos de reseña, electrocardiogramas y ecocardiogramas correspondientes a pacientes caninos sin deficiencias cardiacas evaluados en la Clínica Veterinaria .Veteriland. de la ciudad de Bogotá, mediante la utilización de equipos de diagnóstico de la Universidad Antonio Nariño. Esta base de datos está constituida por los parámetros o medidas cardiacas más utilizadas y por otros adicionales, lo cual permite comparar, revaluar y ajustar los valores estándares establecidos desde los años 60, comprender mejor su utilidad de diagnóstico, realizar análisis comparativos entre razas y otros factores, así como establecer diferentes correlaciones que mejoren la capacidad de diagnóstico.
HLA-G: Su importancia inmunológica
Authors: Rincón Verónica , Manrique Edwin
Published: May 2017

HLA-G es una molécula clase I no clásica (Ib) del Complejo Mayor de Histocompatibilidad Humano (CMH), adopta siete isoformas, resultado del empalme alternativo de un mismo RNA inmaduro, cuatro se encuentran ligadas a la membrana (HLA-G1,-G2, -G3, -G4) y las otras tres formas son solubles (HLA-G5, - G6, -G7), teniendo en común el dominio extracelular a1. Se expresa de forma selectiva en la interfase materno fetal desempeñando un papel crucial en la inducción de un estado de tolerancia del feto semialogénico por el sistema inmune materno. Está molécula inhibe la citólisis de las NK mediante la interacción con uno o varios receptores inhibidores presentes en las NK (KIR), presenta un limitado polimorfismo, se han descrito 15 alelos, 14 de los cuales asignados por la nomenclatura del HLA. El HLA-G está asociado con algunas patologías en la gestación, tales como las infecciones intrauterinas; pre-eclampsia y en aborto recurrente espontáneo. Los estudios van dirigidos a controlar mejor las interacciones HLA G/células NK en la inducción de un estado de tolerancia inmunitaria en el campo del transplante y la inmunología de los tumores.
Aislamiento e identificación de diez cepas bacterianas desnitrificantes a partir de un suelo agrícola contaminado con abonos nitrogenados proveniente de una finca productora de cebolla en la Laguna de Tota, Boyacá, Colombia
Authors: Benavides López de Mesa Joaquín L. , Quintero Gladys M. , Ostos Ortiz Olga Lucía
Published: May 2017

Este articulo presenta los resultados de la versatilidad adaptativa y tolerancia de una consorcio bacteriano constituido por 10 cepas bacterianas endémicas de un suelo agrícola contaminado, proveniente de una finca productora de cebolla ubicada en la laguna de Tota en Aquitania, Boyacá, Colombia, expuesto al uso incontrolado de fertilizantes nitrogenados. La consorcio bacteriano aislado del suelo está conformado por: Bacillus megaterium, Bacillus licheniformis, Pseudomonas stutzeri, Acinetobacter sp, Propionibacterium sp, Peptoestreptococcus sp, Sthaphylococcus coagulasa negativa, Corynebacterium sp, Clostridium sp y Actinomyces sp. Se demostró que los microorganismos aislados tienen capacidad desnitrificante in vitro, transformando el nitrato a nitrógeno molecular. La consorcio bacteriano aislado se constituye en una alternativa de biorremediación para recuperar suelo agrícola contaminado con exceso de fertilizantes nitrogenados.
Presencia de Integrones Clase 1 en Aislamientos de Staphylococcus epidermidis de las unidades de neonatología del Instituto Materno Infantil de Bogotá
Authors: Pinilla MSC Gladys , Muñoz Molina MSC Liliana , Gallego Eva Amanda , Chavarro B. Bibiana , Fandiño Jennifer
Published: May 2017

a multiresistencia a los antibióticos por bacterias Gram positivas, especialmente el Staphylococcus epidermidis, constituye un problema creciente de salud pública en las unidades neonatales. Uno de los mecanismos de resistencia bacteriana recientemente descrito es la presencia de integrones y cassettes genéticos. Existen más de 9 clases de integrones, siendo el de clase 1 el que con mayor frecuencia se encuentra implicado en cepas causantes de infección hospitalaria.En este estudio, se determinó la presencia de integrones clase 1 en Staphylococcus epidermidis, provenientes de hemocultivos y puntas de catéter, que causaron infección nosocomial en las unidades neonatales del Instituto Materno Infantil de Bogotá, Colombia. De las 46 cepas estudiadas, se detectó la presencia del gen intI 1 en 21 de los aislamientos (45.7%). Este hallazgo, pionero en cepas bacterianas aisladas en neonatos, sugiere la necesidad de buscar cassettes genéticos que confieren resistencia a los diferentes antimicrobianos, para definir esquemas de tratamiento de infecciones nosocomiales causadas por estos microorganismos.
Neumonia Nosocomial
Authors: Ostos Olga Lucía , Cifuentes Yolanda , Hernández Barbosa Rubinsten , Muñoz Molina Liliana
Published: May 2017

Se definen como infecciones nosocomiales las que ocurren después de 48 horas de hospitalización. Las Unidades de Cuidados Intensivos neonatales, pediátricas y de adultos son las áreas de mayor prevalencia debido al perfil del paciente, a las terapias y a los procedimientos invasivos a los que son sometidos quienes ingresan. De las infecciones intrahospitalarias, una de las más conocidas y caracterizadas es la neumonía, la cual representa la segunda causa de infección nosocomial, con un aumento en la morbi-mortalidad cuando se encuentra asociada a ventilación mecánica. Su epidemiología está muy bien documentada en adultos, pero existe poca información en niños y neonatos.
Determinación de la asociación entre Chlamydia trachomatis y Neisseria gonorrhoeae, en muestras de orina mediante técnicas debiología molecular
Authors: Coy BSC Gabriela , Ostos Ortiz MSC Olga Lucia , Pinzón BSC Janeth , Sánchez, MSC Ruth Mélida
Published: May 2017

En el presente estudio se evaluó la asociación entre Chlamydia trachomatis (CT) y Neisseriae gonorrhoeae (NG), utilizando la técnica de COBAS AMPLICOR CT/NG Molecular System, en muestras de orina de 355 mujeres con un promedio de edad de 23.9 años; 20 muestras fueron positivas para CT, informándose una prevalencia de de 5.63%. Aunque estudios epidemiológicos han reportado relación entre la infección por Chlamydia trachomatis y las causadas por otros microorganismos como Neisseriae gonorrhoeae; en este estudio no se encontró asociación. Factores como el tipo de muestra y la presencia de inhibidores en la orina disminuyen la sensibilidad en la detección de Neisseriae gonorrhoeae.
Evaluación de la prueba ELISA usando una cepa de campo como antígeno, para detectar anticuerpos contra el virus de la Rinotraqueitis Bovina Infecciosa
Authors: Navarrete MSC Jeannette , Vera, PhD Víctor , Ramírez Gloria , Villamil PhD Luis Carlos
Published: May 2017

El siguiente estudio estableció un inmunoensayo enzimático ELISA, usando partículas virales fraccionadas de una cepa de campo del virus IBR, este mostró una alta sensibilidad y especificidad y una baja tasa de falsos negativos y positivos. Los sueros bovinos positivos y negativos, con los cuales se normalizó la técnica de ELISA, fueron analizados por seroneutralización para determinar anticuerpos anti IBR; se recolectaron sueros negativos y positivos con títulos 1:4 a 1:128 y se consideró la dilución del suero bovino 1:50, como la dilución óptima para la técnica de ELISA. Por otra parte, se utilizó el coeficiente de variación BR, para analizar el grado de repetitibilidad de las absorbancias obtenidas de los sueros positivos y negativos, se obtuvo resultados menores del 20%, lo que indico una adecuada repetitibilidad y un bajo coeficiente de variación.La sensibilidad y especificidad encontrada fue de 96 y 98% respectivamente, teniendo como prueba de referencia la seroneutralización. Los resultados obtenidos, determinan que la prueba de ELISA con partículas virales fraccionadas de una cepa de campo, detecta anticuerpos anti IBR con alta sensibilidad y especificidad, siendo una herramienta para el mejoramiento diagnóstico de la enfermedad.
Actividades hidrolíticas y caracterización isoenzimática de poblaciones microbianas aisladas del patrimonio documental del Archivo General de Colombia
Authors: Villalba MSC Luz Stella , Mikán PhD José Fernando , Sánchez; MSC Jimena
Published: May 2017

Este trabajo presenta un modelo para el aislamiento y evaluación de microorganismos agentes deteriorantes del acervo documental. Se recuperaron e identificaron 28 aislamientos tanto de las unidades de conservación con biodeterioro como de la atmósfera del depósito 15 del Archivo General de la Nación de Colombia (AGN). De este grupo, 16 aislamientos microbianos mostraron capacidad hidrolítica sobre fibras vegetales cuando se cultivaron en medios con paredes celulares al 1% como única fuente de carbono. A las poblaciones microbianas recuperadas se les evaluó su capacidad para hidrolizar celulosa, xilano, almidón y proteínas, considerando los halos de degradación y el número de sustratos hidrolizados, se seleccionaron cuatro aislamientos: dos de Penicillium sp., uno de Bacillus sp. y uno de Actinopolyspora sp.A los aislamientos se les cuantificó las actividades depolimerasas y accesorias y se les determinó el perfil isoenzimático para celulasas y xilanasas. Los resultados sugieren: (i) los hongos filamentosos y actinomycetes son más eficientes en la degradación de polímeros complejos, (ii) posiblemente las poblaciones bacterianas actúan como colonizadores secundarios y (iii) el perfil isoenzimático permite descartar microorganismos saprófitos, de especializados en degradar soporte celulolítico.
Mindful Eating With Diabetes
Authors: Miller Carla K.
Published: May 2017

IN BRIEF This article provides a description of mindfulness and mindful eating and addresses the application of mindful eating as a component of diabetes self-management education. Mindful eating helps individuals cultivate awareness of both internal and external triggers to eating, interrupt automatic eating, and eat in response to the natural physiological cues of hunger and satiety. Mindful eating interventions have been effective in facilitating improvement in dysregulated eating and dietary patterns. Through practice over time, eating mindfully can interrupt habitual eating behaviors and provide greater regulation of food choice. More research is needed to determine the long-term impact of mindful eating programs.
Insights From the National Diabetes Education Program National Diabetes Survey: Opportunities for Diabetes Self-Management Education and Support
Authors: Piccinino Linda J. , Devchand Roshni , Gallivan Joanne , Tuncer Diane , Nicols Christina , Siminerio Linda M.
Published: May 2017

IN BRIEF Diabetes self-management education and support (DSMES) provides the foundation to help people with diabetes (PWD) navigate the numerous self-management decisions and complex care activities they face daily and has been shown to improve outcomes. Without DSMES, PWD often lack the skills and knowledge necessary to handle the demands of managing this chronic disease. Understanding self-management behaviors and responses to DSMES is essential for improving DSMES processes and diabetes outcomes. This article provides the most recent findings from questions regarding self-management behaviors and DSMES practices obtained through the National Diabetes Education Program National Diabetes Survey. Insights and gaps in self-management behaviors and DSMES delivery are examined to identify challenges and offer opportunities for improvement.
Utilization of laser beam oscillation to enhance the process efficiency for deep-penetration welding in aluminum
Authors: Sommer Martin , Weberpals Jan-Philipp , Müller Steffen
Published: May 2017

Laser beam remote welding is an established process in modern production plants. For instance, remote welding is used as a fast joining technology with rather large structural welds in car body manufacturing. Besides the advantages, such as noncontact machining and low process times, laser beam processing is also characterized by a low efficiency in contrast to other joining technologies. Therefore, this research has drawn attention to the improvement of the process efficiency for laser beam welding of the aluminum alloy AlMgSi1. The experiments were performed using a high power diode laser with a beam converter. The used scanning unit allowed a lateral beam oscillation perpendicular to the feed direction. Thereby, a new process was developed on the basis of high frequent beam oscillation. Hence, the sinusoidal beam oscillation enabled a defined heat input, whereas the laser beam was accelerated and the molten pool was widened. As a consequence, the process design leads to a significant preheating of the process zone, which contributes to a reduction in the deep-penetration welding threshold. Accordingly, low laser power is necessary to generate comparably large molten pools by means of laser beam oscillation. Correlating the amount of molten material with the deposited laser power, the results clearly show an increased process efficiency for the deep-penetration welding regime.
HUBUNGAN ANTARA KELAINAN SIKLUS MENSTRUASI DENGAN KEJADIAN AKNE VULGARIS PADA SANTRIWATI SMA ISLAM TERPADU NUR HIDAYAH KARTASURA
Authors: Siregar Ersi Dwi Utami , Ramona Flora , Dewi Listiana Masyta
Published: May 2017

Akne vulgaris (AV) merupakan penyakit kulit yang meradang berasal dari folikel pilosebasea. Insidensi terbesar terjadi pada umur 14-17 tahun pada wanita, 16-19 tahun pada pria. Kejadian AV berkaitan dengan peningkatan produksi sebum oleh hormon androgen serta hormon estrogen dan progesteron yang merupakan pemacu terjadinya AV sebelum menstruasi. Penelitian ini bertujuan untuk mengetahui hubungan antara kelainan siklus menstruasi dengan kejadian akne vulgaris. Penelitian ini merupakan penelitian observasional analitik dengan rancangan cross sectional. Populasi penelitian adalah santriwati SMA-IT Nur Hidayah Kartasura yang berusia 15-18 tahun yang telah mengalami menstruasi.Pemilihan sampel dengan metode simple random sampling dan didapatkan 55 responden yang sesuai dengan kriteria inklusi.Data primer menggunakan kuesioner dan foto wajah responden.Uji analisis yang digunakan adalah uji chi square. Hasil uji statistik dengan menggunakan uji chi square didapatkan nilai p= 0,103 (p>0,05). Pada penelitian ini insidensi siklus menstruasi normal dengan AV sebesar 43,6% lebih tinggi dibandingkan dengan kelainan siklus menstruasi dengan AV sebesar 30,9%. Tidak terdapat hubungan yang signifikan antara kelainan siklus menstruasi dengan kejadian akne vulgaris pada santriwati SMA-IT Nur Hidayah Kartasura. Kata Kunci: akne vulgaris, menstruasi.
HUBUNGAN PEKERJA BASAH DENGAN KEJADIAN DERMATITIS KONTAK AKIBAT KERJAPADA PETUGAS KESEHATAN DI RUMAH SAKIT X TANJUNG, TABALONG, KALIMANTAN SELATAN
Authors: Anshar Rizadin , Pramuningtyas Ratih , Usdiana Devi
Published: May 2017

Prevalensi dermatitis kontak akibat kerja (DKAK) di dunia terbilang tinggi. Kontak kulit terhadap iritan atau alergen di tempat kerja dapat mengakibatkan terjadinya DKAK.Petugas kesehatan merupakan salah satu profesi yang berisiko terjadinya DKAK. Hasil survei pendahuluan yang dilakukan di RS X, Tanjung, didapatkan 6 orang menderita DKAK dari 20 petugas kesehatan yang diwawancarai. Penelitian ini bertujuan untuk mengetahui hubungan antara pekerjaan basah dengan kejadian DKAK pada petugas kesehatan. Desain penelitian menggunakan metode observasional analitik dengan pendekatan cross sectional. Jumlah responden penelitian sebanyak 80 petugas kesehatan. Teknik pengambilan sampel menggunakan simple random sampling. Data primer dianalisis dengan uji Chi Square menggunakan program SPSS 17.Hasil penelitian menunjukkan bahwa nilai p = 0,001 (p < 0,05) yang menunjukkan bahwa terdapat hubungan yang bermakna antara pekerjaan basah dengan kejadian DKAK.Terdapat hubungan yang bermakna antara pekerjaan basah dengan kejadian DKAK pada petugas kesehatan di RS X Tanjung, Tabalong, Kalimantan Selatan. Kata Kunci : Pekerja Basah, Petugas Kesehatan, Dermatitis Kontak Akibat Kerja
UJI EFEK EKSTRAK ETANOL 96% ANGGUR MERAH (Vitis vinifera) TERHADAP PENURUNAN KADAR TRIGLISERIDA PADA TIKUS PUTIH (Rattus Novergicus) YANG DIINDUKSI TRITON X-100
Authors: Saputra Frans , Sutrisna EM , Nurhayani Nurhayani
Published: May 2017

Buah anggur merah diduga memiliki kandungan pterostilbene, resveratrol, proantosianidin dan likopen yang memiliki efek terhadap penurunan kadar trigliserida. Penelitian ini bersifat eksperimental laboratorium dengan metode pre and post test with control group design. Objek penelitian 25 ekor tikus putih jantan, Rattus Novergicus, berat badan 150-200 gram, berumur 3-4 bulan yang dibagi menjadi 5 kelompok dengan teknik simple random sampling, kontrol negatif (aquadest), kontrol positif (Simvastatin 0,2mg/200gramBB/hari), kelompok perlakuan dosis I (100mg/200gramBB/hari), dosis II (250mg/200gramBB/hari), dosis III (500mg/200gramBB/ hari). Ekstrak etanol anggur merah dosis I, dosis II, dosis IIIdapat menurunkan kadar trigliserida darah dengan rerata penurunan secara berturut-turut adalah 147,4mg/dL, 135,2mg/dL, 97,2mg/dL. Pada uji statistic menggunakan one-way ANOVA didapatkan nilai p=0,000 (p<0,05), sehingga terdapat perbedaan signifikan kadar trigliserida darah tikus putih antar kelompok. Ekstrak etanol 96% anggur merah dosis 100mg; 250 dan 500 /200 gramBB/hari dapat menurunkan kadar trigliserida darah tikus putih. Kata kunci :Ekstrak Anggur Merah, Trigliserida, Rattus Novergicus
To Know or Better Not to
Authors: Fernandez Pinto Manuela
Published: May 2017

With an innovative perspective on the social character of ignorance production, agnotology has been a fruitful approach for understanding the social and epistemological consequences of the interaction between industry and scientific research. In this paper, I argue that agnotology, or the study of ignorance, contributes to a better understanding of commercially driven research and its societal impact, showing the ways in which industrial interests have reshaped the epistemic aims of traditional scientific practices, turning them into mechanisms of ignorance production. To do so, I examine some of the main contributions to agnotology and provide a taxonomy of practices of ignorance construction common in commercially driven research today. In particular, I present the tobacco industry’s campaign against the health hazards of smoking as a paradigmatic case of ignorance production, identifying five central strategies. I then argue that the same strategies have been used in three other cases—global warming, pharmaceuticals, and the 2008 financial crisis.
A Practical Comparative Evaluation of Different Active Harmonic Filter Topologies
Authors: P. Salmerón  , S. P. Litrán  , R.S. Herrera  , J. R. Vázquez
Published: May 2017

- Along the last years, the practical use of active filters to mitigate harmonics has been extended in electric power systems. Different configurations of series active filters versus shunt active filters have been proposed, among them, hybrid topologies which combine active and passive filters. Nevertheless, there is not any clear accordance about the most suitable configuration for each type of harmonic sources. In this paper, four different topologies of active power filters to eliminate harmonics have been analyzed. An experimental prototype has been implemented to each configuration and have been submitted to different performance tests. With this objective, a test bank has been developed, which includes nonlinear loads kind harmonic current source, ahrmonic voltage source, and other whose behavior is between they both. The analysis of experimental results obtained allows the most suitable active filter power topology to be determined for each type of load.
Biodiesel production performance estimation from simple viscosity measurements
Authors: L. Díaz  , M.E. Borges  , A. Brito
Published: May 2017

In a biodiesel production industry a quick monitorization of the reaction extent achieved in the process it is important. The usual way to determine the reaction yield is to analyze the FAME content in the biodiesel reaction product. Analytic methods used, mainly gas chromatography, require previous sample treatment or tedious calibrations. Recently, less complicated analytic methods (nuclear magnetic resonance, infrared spectrophotometry) have been developed but they require costly equipment and analysis. The aim of this paper is to develop a cheap and fast method in order to quantify the FAME content in the reaction mixture from simple dynamic viscosity measurements and then the transesterification reaction yield. Therefore, experimentally obtained correlations from biodiesel proceeding of several oil feedstocks are presented in order to estimate the biodiesel FAME content from its dynamic viscosity, a fast determination parameter.
ANALYSIS OF INTERCONNECTED POWER SYSTEMS BY HYBRID CALCULATION
Authors: E. Ortjohann  , P. Wirasanti  , W. Sinsukthavorn  , S. Jaloudi  , D. Morton
Published: May 2017

Distributed Energy Resources (DERs) are being added to the existing power supply systems to compensate for the growing electricity demand. This results in new power supply systems such as mini-grids and micro-grids being implemented into existing grids. In order to manage and optimize the operation of these new systems, power system analysis is utilized. However, the analysis model structure has to be recreated, once a new system joins the existing system. This results in an increased complexity of power system analysis, which calls for its simplification. The objective of this paper is to present a power system analysis method, which does not require restructuring of the analysis model in order to simplify the analysis of interconnected power systems. Hybrid calculation is applied in order to analyze the grid connecting points. This results the proposed analysis method can be performed by exchanging several parameters between the grid connecting points. The simulation results of the proposed method are compared with the general analysis in order to provide proof that the proposed method can be utilized as the general analysis method.
HYBRID SINGLE-STAGE TRIPLE PRESSURE LEVEL ABSORPTION/COMPRESSION CYCLE OPERATED BY LOW GRADE HEAT SOURCES
Authors: M. Jelinek  , A. Levy  , I. Borde
Published: May 2017

The performance of the triplepressure level (TPL) single stage absorption cycle operated with organic refrigerants and absorbents showed many advantages over the common double pressure level (DPL) absorption cycle. In order to enhance these advantages (increased COP) a mechanical compressor and a mixing device were inserted in the super heated refrigerant line between the evaporator and the absorber. The influence of the elevated pressure on the performance of the TPL absorption cycle with the working fluid pentafluoroethane (R125) and N,N'-dimethylethylurea (DMEU) was predicted by a computerized simulation program. The performances of two configurations of the TPL absorption cycle operated with mechanical compressor were compared; a) with common solution heat exchanger (HS) and b) divided solution heat exchanger (pApG). Based on the analysis, in the first configuration a significant reduction of the required generator temperature with increased coefficient of performance (COP), reduction in the circulation ratio (f) and reduction of the actual size of the solution heat exchanger was found. In the second configuration a significant increasing of the COP with less reduction of the required generator temperature but with increased actual size of the solution heat exchanger was found. The disadvantage of inserting the compressor is the increased electrical consumption.
Hydrogen production by aluminum corrosion: Experimental investigation and mathematical modeling
Authors: C.B. Porciúncula  , N.R. Marcilio  , I.C. Tessaro  , M. Gerchmann
Published: May 2017

The search for new energy sources has been a great focus lately because of concerns about climate change caused mainly by fossil fuels gas emissions. The hydrogen is a promising energy source due its clean and high energy combustion. However, the major drawbacks to use hydrogen are the difficulty of formation, transportation and storage. The objective of this work is the study of hydrogen formation by aluminium reaction with water by using strong alkalis as catalysts (NaOH and KOH), and the development of a mathematical model that accounts the evolution of hydrogen at each time. Different alkali concentrations were used (1, 1.5, 2, 2.5 and 3 mol. L-1 ). The reactions were carried out with aluminum in different samples: foils, plates with 0.5 mm and 1 mm width each. The range of temperatures studied was: 295, 305, 315 and 325 K for foils and 0.5 mm plates; 315, 325, 335 and 345 K for 1 mm plates. The results showed a strong dependence of the reaction rate on the temperature, alkali concentration and shape of the samples. The model predictions of hydrogen formation agreed with the experimental data of volume versus time, as well as the peaks observed in the reaction rates.
Induction Motor Capacitances Calculation Using FEA for Common Mode Current Studies in ATP
Authors: C. S. Chaves  , J. R. Camacho  , H. de Paula  , M. L. R. Chaves  , E. Saraiva
Published: May 2017

The prediction of common-mode currents in inverter-driven induction motors is necessary to propose mitigating solutions in order to prevent failures and ensure the proper operation of the entire electrical system. The motor model for these high-frequency studies is relatively simple; however, to find its parameters accurately is a very complex task. In this context, this paper presents an alternative to estimate leakage capacitances in induction motors, based on the finite element technique, through computational simulation using FEMM (Finite Element Methods Magnetics). Then, an application of the motor capacitances in an appropriate model for common-mode quantities determination is shown as an example, using the ATP (Alternative Transients Program).
Photoabsorption Efficiency Improvement for Photovoltaic Solar Cells by Using the Honeycomb Nanostructures
Authors: Alexander I. Fedoseyev  , Frantisek Cajko
Published: May 2017

In this paper we propose a designs of solar cells based on III-V semiconductors which can deliver more efficient, less expensive solar cells. Recently proposed approaches to enhance the efficiency utilize the novel III-V nanomaterials containing quantum dots, and new concepts like intermediate bandgap quantum dot based solar cells promise the efficiency over 50% [1]. Needs for thin flexible space solar cells are supposed to be fulfilled with Inverted Metamorphic Multijunction (IMM) solar [2]. In this paper we consider the alternative design of flexible solar cells, which is based on a honeycomb nanostructure consisting of embedded semiconductor pillars in a flexible film [3]. Such nanostructures are flexible and solar cells therefore are suitable for wider range of applications compared to ones with solid panel design, and are less expensive due to the smaller fraction of the active semiconductor material. However this kind of design may reduce the efficiency of the solar cell due to the volume filling factor.
Modelling and Analysis of Electromechanical Stress in Transformers Caused by Short-Circuits
Authors: Rosentino Jr. A. J. P  , Saraiva E  , Delaiba A. C  , Guimarães R  , Lynce M  , De Oliveira J. C  , Fernandes  Jr. D  , Neves W
Published: May 2017

A common reason for internal faults in transformers windings is the weakness insulation caused by vibration / deformation related to electromechanical forces produced by high short circuit currents. This phenomenon significantly reduces the transformer life expectancy and may even lead to its instantaneous or timing destruction. Focusing this subject this paper is aimed at presenting the performance of a time domain model inserted in a finite element program i.e. the 3D software package and the investigation of the relationship between high current levels occurring at transformer windings and the internal mechanical stresses. To highlight the overall model and the software performance, a laboratory 15 kVA transformer is utilized to show the programme facilities and potentially. The transformer has been built with concentric double-layer windings and ferromagnetic core with three columns and this equipment has been submitted to a balanced three-phase short- circuit. In addition, the computational simulations were carried out using distinct geometries to the windings i.e. with and without deformation.
Optimisation of Concentrator in the Solar Photonic Optoelectronic Transformer: Comparison of Geometrical Performance and Cost of Implementation
Authors: F. Muhammad-Sukki  , R. Ramirez-Iniguez  , S. G. McMeekin  , B. G. Stewart  , B. Clive
Published: May 2017

The Solar Photonic Optoelectronic Transformer (SPOT) is one of the components of the SolarBrane, a Building Integrated Photovoltaic (BIPV) system developed by SolarEmpower Ltd. The SPOT employs 2-D linear dielectric totally internally reflecting concentrator (DTIRC) to increase the collection efficiency of the sun’s rays and reduce the amount of photovoltaic (PV) material used. In this paper, an optimised DTIRC design for the SPOT, based on the maximum concentration method (MCM), is discussed. Next, the geometrical properties of the optimised DTIRC design are explained and compared to a DTIRC based on the phase conserving method (PCM). A cost analysis of implementing the MCM is also presented. The results obtained from simulations in MATLAB show that the MCM offers higher geometrical concentration gains and at the cost of increasing the concentrator size. The new optimised concentrator offers a lower cost of implementation, shorter payback period and an even higher annual return as compared to the existing design.
Concept study of offshore wind and tidal hybrid conversion based on real time simulation
Authors: G. Caraiman  , C. Nichita  , V. Mînzu  , B. Dakyio  , C.H. Jo
Published: May 2017

This paper deals with a conversion system concept based on the real time simulation of a hybrid offshore wind and tidal current system. In order to provide reliable, environmental, and costeffective electrical energy we present a simulation research device composed by two real time emulators:, one for each type of energy: a wind turbine emulator and a tidal turbine emulator. The wind turbine emulator based on a permanent magnet synchronous machine, is used to simulate the characteristics of a working turbine and an electrical generator. The tidal turbine emulator has in its composition 3 electrical drives: an asynchronous drive with vector control used to simulate the behaviour of a tidal turbine, a double feed asynchronous generator and an active break. Both of them are using the “hardware-in the-loop” techniques.
Cost Estimation of Wind Farm with Battery-supported Output Power Limit Operation
Authors: Y. Yasuda  , T. Funabashi
Published: May 2017

. Due to shortage of a controllable capacity during night, a secondary battery is strongly expected to a newly installed grid-connected wind farms in some areas of Japan. However, the battery is nowadays too expensive for a wind farm developer to keep their generation cost competitive. It is therefore strictly needed to establish an optimal battery strategy to satisfy both of stability of output and cost-effective installation. In this reports, a fundamental case study is discussed to estimate the cost for battery installation to a wind farm with output power limit operation. Using real wind condition data from a typical meteorological observatory, an annual electric energy generated from wind farms with various battery capacities is estimated regarding with a nighttime wind condition. As the result of the annual production estimation, it became clear the relationship between the battery capacity and the energy production cos
Annealing of ZnO and SnO2 transparent conductive oxides
Authors: K. Lagha  , MS. Belkaid  , M. Pasquinelli  , D. Barakel  , L. Escoubas
Published: May 2017

Transparent Conductive Oxide (TCO) are used in different field [1], especially as antireflective layers on the surface of solar cells [2,3].But in the solar cells process, annealing steps are often used , i.e ; the front metallic contacts of solar cells are obtained by serigraphy at high temperature (800 – 830°C). In this case what happen in TCOs used as antireflective layers ?. In this work we present the comparison of changes in physical properties of two TCOs: tin oxide SnO2 and zinc oxide ZnO when they are annealed at low and high temperatures. These films are deposited by the Atmospheric Pressure Chemical Vapour Deposition APCVD technique. Tin oxide is deposited from tin dichloride (SnCl2, 2H2O) precursor and zinc oxide is obtained by the use of zinc acetylacetonate Zn(C5H7O2)2. The electrical and optical properties of tin oxide and zinc oxide are determined by the four points probes method and spectrophotometry measurement. The values of the resistivity of tin oxide and zinc oxide are 10-4 Ω.cm and 10-3 Ω.cm respectively. These films present an optical transmission higher than 80%. The scanning electronic microscopy images show that the films have a polycrystalline aspect. A post annealing of these TCOs at 450°C improves their electrical properties, while an annealing at higher temperature damage them.
Modelling and Power Control of Wind Turbine Driving DFIG connected to the Utility Grid
Authors: Karim Belmokhtar  , Mamadou Lamine Doumbia  , Kodjo Agbossou
Published: May 2017

In this paper, the modelling and power transfer control of the variable speed wind energy system are presented. Firstly, a Maximum Power Point Tracking (MPPT) method is developed in order to maximize the energy generation of wind system based on doubly fed induction generator (DFIG). Then, the control of both Rotor Side Converter (RSC) and Grid Side Converter (GSC) is studied and the design of a multivariable selective filter is presented. Finally, simulation of a 850 kW doubly fed induction generator wind system was performed in the Matlab / Simulink / SimPowerSystems environment
Quality of Ashes Produced in the Co-Combustion of Coal and MBM in a Fluidized Bed Reactor
Authors: R. Barbosa  , N. Lapa  , H. Lopes  , I. Gulyurtlu  , B. Mendes
Published: May 2017

Since the 90’s decade there are severe restrictions to the use of MBM, due to BSE. The co-combustion of Meat and Bone Meal (MBM) and coal is a possible energetic valorization route for MBM. However, the chemical and ecotoxicological properties of the ashes produced in this co-combustion process need to be more characterized. In order to evaluate the chemical and ecotoxicological properties of this type of ashes, three combustion tests were performed in a fluidized bed reactor (FBR): 1) combustion of coal; 2) co-combustion of coal and MBM; 3) combustion of MBM. The characterization of the ashes was focused on the following aspects: (1) the bulk content of metals; and (2) the chemical and ecotoxicological characterization of eluates. The ashes were classified according to their ecotoxicity levels based on the French regulation CEMWE. According to Council Decision (CD) 2003/33/EC, all fly ashes need stabilization prior to landfilling, except the 1st cyclone ash produced in the co-combustion test that could be landfilled in a hazardous waste landfill. The bottom ashes were classified as non-hazardous residues. The novelty of this paper is related with two aspects: 1) the use of MBM as co-fuel; and 2) both chemical and ecotoxicological characterization of the ashes produced during the combustion of coal and MBM
Artificial Intelligence Techniques for Controlling Spacecraft Power System
Authors: Hanaa T. El-Madany  , Faten H. Fahmy  , Ninet M. A. El-Rahman  , Hassen T. Dorrah
Published: May 2017

Advancements in the field of artificial intelligence (AI) made during this decade have forever changed the way we look at automating spacecraft subsystems including the electrical power system. AI have been used to solve complicated practical problems in various areas and are becoming more and more popular nowadays. In this paper, a mathematical modeling and MATLAB–SIMULINK model for the different components of the spacecraft power system is presented. Also, a control system, which includes either the Neural Network Controller (NNC) or the Fuzzy Logic Controller (FLC) is developed for achieving the coordination between the components of spacecraft power system as well as control the energy flows. The performance of the spacecraft power system is evaluated by comparing two control systems using the NNC and the FLC.
Fuzzy Multi-Agent Based Voltage and Reactive Power Control
Authors: Bessie Monchusi  , Adedayo Yusuff  , Josiah Munda  , Adisa Jimoh
Published: May 2017

. Variations in load and generation profiles cause
overvoltages leading to equipment insulation failure and
undervoltages, which impact voltage stability margin. Voltage
and reactive power control aims to keep the voltage profiles
within desired limits and reduce power losses. In this paper
multi-agent system based on Java technology and adaptive fuzzy
logics algorithms are implemented to control voltage and reactive
power. Agents communicate with each other using Foundation
for Intelligent Physical Agents (FIPA) to be able to achieve their
objectives. A fuzzy agent controls the voltage at the busbars.
Multi-agent systems make it possible to do three hierarchal
voltage control in distribution systems.
Meat and Bone Meal as a Renewable Energy Source in Cement Kilns: Investigation of Optimum Feeding Rate
Authors: W.K.H. Ariyaratne  , M.C. Melaaen  , K. Eine  , L.A. Tokheim
Published: May 2017

Meat and Bone Meal (MBM) is a CO2 neutral fuel, and hence is a good candidate for substituing fossil fuels like pulverized coal in rotary kiln burners used in cement kiln systems. MBM is used in several cement plants, but the optimum substitution rate has apparently not yet been fully investigated. The present study aims to find the maximum possible replacement of coal by MBM, without negatively affecting the product quality, emissions and overall operation of the process. A full-scale experiment was carried out in the rotary kiln burner of a cement plant by varying the MBM substitution rate from 0 to 7 t/hr. Clinker quality, emissions and other relevant operational data from the experiment were analysed. Additionally, coal and MBM were compared by laboratory experiments. The results revealed that MBM could safely replace more than 40% of the coal energy without giving negative effects. The limiting factor is the free lime content of the clinker. Possible explanations to the free lime increase are given. If 40% of the coal in the rotary kiln burner was replaced by MBM on a long-term basis, the total annual CO2 emissions of the plant could be reduced by 10%.
A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables
Authors: F. N. Lima  , A. P. Finazzi  , B. C. Carvalho  , Iago de Moura Faria  , Gabriela Pessoa Campos
Published: May 2017

It is widely recognized that water tree degradation would cause serious problems and it is generally agreed that is one of the most hazardous factor in the life of XLPE power cables and hence a major cause of MV power insulation premature failure. Such accidents affect the power supply system operation and reliability. Therefore, many techniques have been developed and employed in order to detect water tree at the early stages. In this context, the loss current technique is a suitable method for investigating slight degradation, since the cable degradation by water tree gives rise to harmonics components in the loss current. A comparative analysis of the values of various performance parameters that has been used in studies to evaluate the water tree degradation in power cables, obtained from the different loss current measuring circuits, is presented. This comparative analysis is made through a mathematical procedure and confirms the possibility to identify, with a very good accuracy, the loss current only from the measured leakage current without the need for specific measurement circuit used to distinguish the loss current that flows in the insulation layer. Furthermore opens the possibility to use the Fryze’s equivalent conductance to eliminate in real cases the fundamental capacitive current of the total leakage current and perform online diagnosis only from the applied voltage and total leakage current measurements.
Wind flow around a wind turbine system over hilly terrain and its environmental effects: wind tunnel tests
Authors: M. Jiménez-Portaz  , F.J. Bello-Millán  , P. Folgueras  , M. Clavero  , M.A. Losada
Published: May 2017

Wind tunnel tests were performed in order to study the wind flow field over hilly terrain and the effects of a wind turbine on a typical Mediterranean ecosystem. Cross-wire anemometry was used to measure wind speed and turbulence intensity, and Reynolds stress was estimated over the ground as well. The tests show changes in the wake behind the wind turbine, showing a decrease of wind speed and an increase of turbulence intensity caused by the system. Theoretical formulations allow to relate the measured disturbances in the Atmospheric Boundary Layer (ABL) to seed dispersion by wind and evaporation rate. Results are in concordance with previous studies.
Mission Profile-Oriented Design of Battery Systems for Electric Vehicles in MATLAB/Simulink®
Authors: T. Debreceni  , G. Gy. Balázs  , I. Varjasi
Published: May 2017

Due to the nonlinear characteristics of the battery cells and the non-static power demand of the electric vehicles (EV) during their mission profiles, the dynamic behavior of the system cannot be statically calculated and analyzed in course of the electrical design of the battery system (BS). In this paper, a simulation environment is presented as a tool for mission profile oriented electrical design and performance analysis of BS in drives of e-cars and e-aircrafts. This allows effective design and rapid verification of the system level requirements. The model design is submitted through the introduction of the operation with equations and simulation results in MATLAB/Simulink®. The paper describes a case study, the model performance is investigated, where the New European Driving Cycle (NEDC) is taken as basis. The BS contains a battery pack (BP) of lithium ion cells with relatively high energy- and power density.