bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of a Practical Straightening Simulation for Welded Structures Using Inherent Strain Method
Authors: Hector Ruiz , Naoki Osawa , Hidekazu Murakawa , Hidekazu Murakawa , Sherif Rashed 
Published: March 2018

Welding is the most widely used assembly method available to industries in the construction of metal structures, ships, and offshore platforms. However, this method always produces a certain amount of distortion that will not only degrade the performance but also increase the building cost of the structure, and it should be straightened. Murakawa [1] developed a thermal elastic plastic based and inherent strain based welding simulation FE code JWRIAN. Coarse shell FE models are usually used in the inherent strain based JWRIAN elastic analyses. This drastically reduces the manpower needed for modeling and computer resources needed for the calculation. However, it is not easy to perform straightening analysis using JWRIAN because gas heating’s inherent strain distributes over a range much smaller than element sizes of the shell model.RUIZ [2] modified JWRIAN’s code so that the inherent strain equivalent nodal forces along the heating line are calculated and applied in the elastic shell analysis. However, a discrepancy between 3-dimensional thermal-elastic-plastic analysis and elastic analysis was observed. This is mainly because of the nature of solid and shell elements. RUIZ [3] proposed a linearized inherent strain and applied it to both 3-d and 2d analysis, getting matching results between solid and shell element models. In this study, as a working example, a thin plate panel with an opening is considered utilizing the developed system at the same time a friendly user interface for staffs and workers on a production site is developed. Keywords: Inherent strain, straightening, finite element method, Gauss-Legendre quadrature
Photoluminescence in Raman Scattering: Effects of HfO2 Template Layer on Ultrananocrystalline Diamond (UNCD) Films Grown on Stainless Steel Substrates
Authors: De Obaldia Elida , Tirado Pablo , Alcantar Jesús , Montes Jorge , Auciello Orlando 
Published: March 2018

The growth of polycrystalline diamond films can play an important role in industry if they can be grown on industrially used materials like aluminum (Al) or stainless steel (SS). A critical issue related to the growth of ultrananocrystalline diamond (UNCD) thin films on metals like SS, in a Hydrogen rich environment like the one present during growth of UNCD films, is the diffusion of Hydrogen (H) into the SS substrate, as it has been observed in prior research, which results in hydride formation in the SS that induce brittleness in the SS substrate. Several interface layers have been proposed described to avoid the H diffusion into the SS. However, HfO2 has not been explored. The work reported here was focused on investigating the growth of UNCD films on commercially available SS substrates by using an interface layer of HfO2, which was found to be a good diffusion barrier for H to inhibit penetration into the SS substrate. The samples where characterized with SEM and Raman spectroscopy. A photoluminescence (PL) effect, observed in the Raman scattering analysis, is present in all the samples. The PL effect may be due to the interaction of the UNCD / HfO2 interface. and the SS substrate rather than UNCD film alone. The novel result from the experiments described here, is the fact that it is possible to grow UNCD films on unseeded HfO2 layers on SS substrates.Keywords: Poly-crystalline diamond, photoluminescence, UNCD, Stainless Steel, Hafnium Dioxide
Estudio de Materiales Nanoestructurados por Metalurgia de Polvos del Ternario Zn-Al-Ag
Authors: Hernández Nancy Badillo , Bustos Estela Sarmiento , Ocampo Arturo Molina , Casolco Said Robles 
Published: March 2018

In this work one presents the study realized to the compound materials: a) Zn77.0-Al22.0-Ag1.0 (wt. %) [Ternary Alloy], b) Zn77.0-Al22.0-Ag-1.0 (wt. %) [Compound Material 1] reinforced with 5 % of NaCl, and c) Al77.0-Zn22.0-Ag1.0 (wt. %)/Si [compound Material 2], the materials were incorporated by means of the alloyed mechanic in a time of grinding of 7 hours. The microstructural characterization was realized by means of: a) Diffraction of beams-X (DRX), b) Scanning Electronic Microscopy (SEM) and c) Microhardness Vickers (HV). The aim of this work was to study the effect of the microstructure and the hardness of a materials composed bases zinc and his comparison with a ternary alloy. Materials were obtained nanostructure by sizes of crystal in the ternary alloy of 94nm, and for the compound materials 1 and 2, 116 and 121 nm respectively. The values of hardness obtained for three systems have direct relation with the size of crystal. The image obtained to SEM at 7 hours of grinding suggests that the ternary alloy presents in the morphology bigger agglomerated particles and the compound material 2 particles small flakes. The results suggest that porous materials were obtained in three studied systems. Keywords: Mechanical alloy, Metallurgy of powders, Nanocomposite, Reinforcement with particles.
Identificación de Parámetros de Desempeño de un UAV a Través de Vuelos de Prueba
Authors: Castillo Oscar Daniel Garibaldi , Beltrán Ana 
Published: March 2018

The design and implementation of a autonomous navigation and control system for UAV, mandates simulating the system before in-flight testing. These simulations require a computational model of the aircraft, that can be obtained from the computation of aerodynamic parameters such as the drag polar. In this paper we present the identification of these parameters using two methods: one by flight testing techniques; the other by a combination of semi-empirical methods and computational fluid dynamics, dubbed the hybrid method. The hybrid method, which produces a parabolic polar drag, had the same qualitative trend compared to experiments. However, a detailed analysis of the parameters that shapes the polar drag, had significant differences, particularly in the parasite drag. This is probably due to propeller effects, low Reynolds Number and limitations of the piloting technique.Keywords: Drag polar, flight testing, parasite drag, UAV, VLM
Segmentación de Imágenes Basada en Entropía de Pixel
Authors: Caballero Rony , Berbey Aránzazu , Cogley Alberto 
Published: March 2018

In this research, a new methodology for color image segmentation is proposed. In this approach, a pixel entropy derivative based rule is used. The algorithm is tested not only with good quality images, but also with some of them with light scattering and absortion problems. Preliminary results shows good performance of this algorithm.Keywords: Image processing, segmentation, entropy, feedback.
Métodos de Interpolación Basados en Funciones de Base Radial con Aplicaciones a la Reconstrucción de Imágenes
Authors: Combe Rodrigo , Arrocha Idulfo 
Published: March 2018

This article presents the Radial Base Functions (RBFs) as a functional interpolation method for implicit surface reconstruction from points cloud. These methods allow not only to improve inaccuracies resulting from scanners, but also possible discontinuities that occur in the point clouds. The complexity of three-dimensional objects makes reconstruction difficult since devices such as scanners do not always faithfully reproduce the objects, which can lead to information gaps or an incomplete reconstruction. Interpolation methods based on RBFs allow to correct these errors. Three-dimensional surface reconstruction has wide applications in biomedical engineering, in the design of industrial parts, among others. With the algorithm, we developed we have been able to make reconstructions of both explicit and implicit functions, in two and three dimensions.Keywords: Radial Basis Functions, Three-dimensional reconstruction, Interpolation Methods.
Experimental Study of a natural ventilation strategy in a Full-Scale Enclosure Under Meteorological Conditions: A Buoyancy-Driven Approach
Authors: Austin Miguel Chen , Bruneau Denis , Sempey Alain , Mora Laurent , Sommier Alain 
Published: March 2018

The performance of a natural ventilation strategy, in a full-scale enclosure under meteorological conditions is studied through an experimental study, a buoyancy-driven approach, by means of the estimation of the air exchange rate per hour and ventilation power. A theoretical and an empirical model are proposed based on the airflow theory in buildings and blower-door tests. A preliminary validation, by comparing our results with standards in air leakage rate determination, is made. The experimental study conducted here has shown that the natural ventilation strategy implemented reach promising air exchange rate levels, as they are rather high compared to other experimental studies found in the literature. The proposed models have shown good potential and further analysis should take place. Also, other methods for validating these models should be implemented (for instants: CFD simulation or tracer gas methods), as the one in the standards is rather rough estimations.Keywords: Buoyancy-driven, natural ventilation, ventilation power, blower-door test, airflow in buildings.
Análisis del Potencial Energético Solar Basado en Mediciones in Situ en el Municipio de Acacías - Meta
Authors: Aya Angel Alejandro Rodriguez , Luna John Alejandro Figueredo , García Juan Alejandro Chica 
Published: March 2018

This research presents the preliminary results of the research entitled Design and implementation of a fixed and mobile photovoltaic system to capture the solar power, determining the cost-benefit ratio for the Acacías CEAD, a study that will determine the solar power that affects the University National Open and Distance - UNAD of the municipality of Acacías and deliver a study to determine the solar radiation of the area, in order to verify the potentiality and feasibility of installing solar energy systems in the University and nearby areas; It has been possible to determine that solar power in the area per m² is close to 45% of that measured by IDEAM (Hydrology, Meteorology and Environmental Studies Institute in Colombia), with a potential absorption of 331W per day in an area of 1m², which makes feasible a possible implementation of a solar energy system. Keywords: Solar power, solar energy, solar panel, energy efficiency.
Occupancy profiles modelling based on Indoor Measurements and Clustering Analysis: Application in an Office Building
Authors: Mora Dafni , De Simone Marilena , Fajilla Gianmarco , Fábrega José R. 
Published: March 2018

Sensors were applied in an office building to obtain information regarding user presence and absence intervals. Occupancy was also recorded by manual observation, and indoor parameters such as air temperature, relative humidity, carbon dioxide (CO2), volatile organic compounds (VOC) were monitored. Occupants’ behaviors regarding door/window (open/closed) and electric power were considered. Clustering analysis by manual observation was employed to identify similarities in daily or monthly occupancy and to describe possible occupancy profiles. Similar approach was carried out with each monitored parameter and the results of clustering elaboration were compared with the real occupancy profiles to identify which sensor is more effective to measure office occupancy. Furthermore, data were analyzed to explore relationships between occupancy and the magnitude of indoor environmental changes with the objective to identify daily, weekly, or monthly patterns. Single-linkage, complete-linkage, and average-linkage clustering were applied to each dataset. The cophenetic correlation coefficient was used to verify the quality of the results obtained for each variable, and the complete linkage was selected to define the groups. Comparison between occupancy real data clustering and VOC and open/closed door groups demonstrated not similarities. The electricity consumption and CO2 data showed some similarities.Keywords: Occupancy detection, environmental sensor, clustering analysis, Office buildings
Zeolitas Naturales: Una Alternativa para la Remediación Ambiental
Authors: Espinosa Licda. Yahaira , Olmos M.Sc. Jorge , Hernández B. Dr. Cecilio 
Published: March 2018

A brief abstract of the research work not more than 200 words in length should be typed here. Must include a statement of relevance, the main objective, the scope of work to be presented, and most significant findings. Do not include figures, tables or illustrations in this section. The conference will accept papers in English, Portuguese and Spanish. If the papers is written in a language different than English, a translation of the abstract and the keywords must be included after the abstract.Keywords: Natural zeolites, heavy metals, contamination, remediation, adsorption.
Real World Data en la Sanidad Española
Authors: Díez Isabel De la Torre , Rodríguez Guillermo Fernández , Castillo Gema , Alvarez Aranzazu Berbey 
Published: March 2018

In recent years, thanks to the progress of electronics and computing, it is possible to process a large volume of clinical data. As a result of this scenario, real world data (RWD) are gaining enormous relevance. RWD are the data, whose origin is the usual clinical practice, used to make medical decisions about drugs or medical practice. This research is aimed to study the current situation of RWD in Spain. To achieve this objective, we have assessed the data sources on which these are fed. We have also analyzed the main publications based on RWD. Our findings are: firstly, both records and databases as well as medical histories have a high level of computerization and have also a great deal of information to be used for research; and secondly, the scientific studies carried out are of a great quality, but society is not aware of the importance RWD have and there is discoordination between the Autonomies and the Government. Keywords: RWD, clinical data, medical decisions, practical decisions, medical histories
Herramienta para el Análisis de la Calidad de Servicio de Una Red Simple
Authors: Felipe Marely del Rosario Cruz , Ortega Maricela Pinargote , Ureta Gabriel Demera 
Published: March 2018

El crecimiento de las redes y la incorporación de nuevos servicios a las mismas, hace necesario implementar técnicas de calidad de servicio (Quality of Service, QoS) para satisfacer las necesidades siempre crecientes de los usuarios informáticos. A su vez esto trae aparejado la necesidad de implementar mecanismos de evaluación de la QoS dentro de ellos uno de los más efectivos la simulación, para así poder predecir el comportamiento de las redes y aparejado a esto tomar todas las medidas necesarias para su correcto funcionamiento. Es por esto que la presente investigación tiene como objetivo elaborar una herramienta para la simulación de una red simple, la cual permitirá calcular los parámetros de QoS. Esta herramienta se encuentra sustentada en un modelo de una red simple, desarrollado para la simulación y muestra resultados de la misma, arrojando la comparación con resultados obtenidos a partir de un modelo analítico de una red simple lo cual permite corroborar la efectividad de la herramienta desarrollada. Palabras claves: Calidad de servicio, red, herramienta, modelo.
Monitoreo de la Actividad Física a Partir de un Modelo Basado en Redes Neuronales, con Dispositivo "Wearable"
Authors: Rodríguez Humberto , Grimaldo Gabriel , Manzano Andrés 
Published: March 2018

The smart devices used for health and physical activities monitoring are elements with high presence in the market of wearables. This work presents an estimaton method for walking speed based on a multilayer artificial neural netwok, which has been trained to obtain the ratio between this speed and the frequency of the arms motion, characteristics of each person. In spite of using only 3 input variables (hight weight and gender), errors than less than 10% were obtained for the mentioned ratio. In addition, the estimation algorith has been incorporated into a low cost, wrist weareable device, ehich uses a inertial measurement unit (IMU) to measure the angular velocity of one arm. These IMUs are not common for these type of devices, but can be used to obtain more accurate speed measures than those obtained by meas of GPS units. Thus, the system can be used to record the physical activity with higher accuracy.Keywords: Artificial neural network, walking speed measurement, health monitoring, IMU, GPS.
Prevalence and Clinical Characteristics of Molar-Incisor-Hypomineralization in School Children in Riyadh, Saudi Arabia
Authors: Al-Hammad Nouf S. , Al-Dhubaiban Mohammed , Alhowaish Latifa , Bello Lanre L. 
Published: March 2018

Objective: To evaluate molar-incisor-hypomineralization (MIH) prevalence, clinical characteristics, and severity amongst school children in Riyadh, Saudi Arabia.
Subjects and Methods: Randomly selected, healthy third- and fourth-grade students (aged 8–10 years) attending elementary schools in Riyadh, and children of the same age attending dental clinics at the College of Dentistry, King Saud University, were examined for the presence of MIH, its clinical characteristics, and severity.
Results: The sample studied consisted of 924 children, 447 (48.4%) of whom were boys. There were 376 children, (199 females and 177 males), with at least 2 index teeth affected (prevalence = 40.7%). A total of 133 (35.4%) had only molar hypomineralization (MH), whereas 243 (64.6%) had molars and incisors involved (MIH). The mean number of affected teeth per child was 6.6 ±3.6 (3.3 for molars and 3.2 for incisors). The chi-Square test showed no association between the distribution of hypomineralization and age (P = 0.115). Children with severe hypomineralization predominated across all age groups, with the 10-year-old group having more severely affected children (71.9%) compared to 8- and 9-year-old groups (P = 0.000). Proportional t-test showed no statistically significant difference (P>0.05) between males and females in the occurrence of MH or MIH, and in the severity of the hypomineralization. Upper molars were more affected than lower molars, whilst upper incisors were more affected than lower incisors.
Conclusion: Enamel hypomineralization is a common feature in the dentition of 8–10-year-old children in Riyadh, Saudi Arabia. There is no association with age and no gender predilection.
Assessment of risk factors contributing to urinary tract infections in women
Authors: Mishra Dr. Vishal , Singh Dr. Alok Pratap , Singh Dr. Lal Mani 
Published: March 2018

Introduction : Urinary tract infection is a common contagion among men and women but incidence is quite high among women due to their anatomy. The incidence of the infection is higher among sexually active women and the possibilities of encountering the infection after a sexual intercourse is higher. Identified risk factors for such infections include sexual activity, spermicide-based contraception, delayed postcoital micturition, and a history of previous UTIs.
OBJECTIVES :

To assess socio demographic factors among patients of urinary tract infection.
To assess risk factors contributing to urinary tract infection.

Material and methods :
Total 91 female patients, who were diagnosed to have urinary tract infection were selected in our study. Data regarding socio-demographic and various risk factors was collected and frequency distribution tables were prepared.
RESULTS : Majority females (68%) were between 18-45 years old. About 64% patients belonged to rural area, and 90% patients belong to lower, or lower middle class. About 68% patient’s education was below high school and about 74% patients were married. Among risk factors for UTI, we found that sexual activity (in 83%) was most common risk factor for UTI.
CONCLUSION: Patient who are exposed to risk factors, should be given special attention by the visiting clinicians, so that early diagnosis can be made and early treatment can be started. Early diagnosis and treatment leads to less complications, morbidities and mortality.
La curiosidad de los alumnos en las clases de ciencias biológicas
Authors: Klimavicius Susana 
Published: March 2018

La búsqueda de las preguntas de los alumnos como reflejo de su curiosidad y las estrategias docentes que las promueven, fueron el corazón de la investigación. Sólo alumnos motivados, curiosos, creativos, con capacidad de hacerse preguntas y pensar estarán preparados para interpretar y comprender el mundo que los rodea. Para el marco teórico se transitó por diferentes dimensiones y el diseño metodológico combinó instrumentos de la investigación cualitativa: observación de clases, entrevistas a tres profesores, dirección, bibliotecóloga y el relato de 157 alumnos que fueron una inagotable fuente de expresiones sobre cómo sienten la vida en el aula de Biología. En el ecosistema liceal hemos percibido que muchos pueden ser los factores que inciden en la formulación de preguntas. El profesor desde su rol posee en sus manos la llave que abre la puerta de la curiosidad. La tarea no es sencilla, pero es posible; dependerá de las estrategias que se desplieguen.
Enhancing Spiritually Based Care through Gratitude Practices: A Health-Care Improvement Project
Authors: Beese Rebecca J. , Ringdahl Deborah 
Published: March 2018

Addressing spirituality in health care is important as it improves health outcomes; however, several provider barriers exist to providing spiritually based care. A chart audit at a multidisciplinary wellness center serving a population with chronic mental health problems identified a need to improve the number of spiritually based interventions provided to clients by the nurse practitioner. A quasi-experimental design and pre- and post-test questionnaire were used to measure outcomes including the number of spiritually based interventions and provider attitudes. Providers, including a nutritionist, exercise physiologist, pharmacist, acupuncturist, and nurse practitioner, participated in two, 1-hour interactive educational sessions on providing spiritually based care, emphasizing the use of gratitude practices. The mean number of spiritually based interventions charted per visit by the nurse practitioner increased from 0.4 pre-implementation to 1.1 post-implementation (rate ratio = 2.57, with 95% CI [1.75, 3.87]; p < .001). Descriptive statistics from all providers show improvements in attitudes and comfort level in addressing spiritually based care. Several intervention areas documented by the nurse practitioner decreased significantly, including mind/body, which may be related to the study, as many spiritually based interventions are also mind/body interventions. Interactive educational sessions on spirituality can improve a health-care team's attitudes, comfort level, and practice of providing spiritually based care. Generalizability is limited to the project site, but the process could be implemented in other facilities to determine if similar results can be achieved.