bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comportamiento físico y mecánico de elementos no estructurales a base de concreto elaborado con fibra de cáscara de arroz
Authors: Martínez-Gatica Pala A. , Hans Stephane , Araya-Rodríguez Mauricio 
Published: October 2021

En el presente trabajo de investigación se estudió el comportamiento físico y mecánico de dosificaciones de concreto con fibras naturales utilizadas para la elaboración de elementos tipo bloques no estructurales. Las dosificaciones fueron elaboradas con un ligante tipo cemento Portland y como único agregado la cáscara de arroz sin ningún tipo de tratamiento previo, en este proyecto, a esta mezcla se le denomina bio-concreto. Este proyecto se realizó en la Escuela Nacional de Trabajos Públicos (ENTPE) de la Universidad de Lyon en alianza de investigación con la Escuela de Ingeniería en Construcción del Tecnológico de Costa Rica. Se estudiaron diferentes dosificaciones de bio-concreto en donde se analizó el comportamiento mecánico ante la compresión en especímenes cilíndricos con el fin de elegir dos dosificaciones, una para Costa Rica y una para Francia.
Una vez elegidas las dosificaciones, se procedió a estudiar el comportamiento mecánico a compresión en cilindros, la flexión en prismas, el comportamiento térmico en especímenes de ambas formulaciones, culminando con el comportamiento mecánico a compresión de bloques de 15x20x40 cm (ancho, alto y largo). Los resultados muestran el cumplimiento con la resistencia mínima ante la compresión de las normas vigentes para Costa Rica y Francia, ambas formulaciones permiten además tener un material con alta capacidad de aislamiento térmico y densidades menores a 1 500 kg/m3. Por lo que el uso de este material no se limita a muros no estructurales sino también podría ser utilizado en techos, pisos y acabados.
Relación entre la fuerza de agarre y pinza con dinamometría isométrica y los desórdenes músculoesqueléticos en la población adulta de Bogotá, Colombia
Authors: Pacheco-Arias Kevin 
Published: October 2021

El contar con entornos de trabajo saludables se ha vuelto un desafío importante para la mayoría de las empresas. Dentro de los elementos de promoción que establece la Organización Mundial de la Salud (OMS) se encuentra el adecuado diseño de los puestos de trabajo y el conocimiento de las principales limitaciones de los trabajadores. Por ello, el estudio de las habilidades físicas, como la fuerza de agarre y pinza lateral o palmar se ha vuelto un tema de interés, dado el alto índice de enfermedad laboral en la población adulta de Bogotá. El presente artículo muestra la relación estadística entre la fuerza de agarre y pinza dinamométrica, aspectos como el género, la edad y aquellas afectaciones como el dolor en el cuello, hombro, medio brazo; codo, antebrazo y dedos de los trabajadores del Instituto Colombiano de Bienestar Familiar (ICBF). Esto, mediante un estudio correlacional de corte transversal donde se estudió un N de 317 participantes; 204 mujeres y 113 hombres entre los 18-57 años. Se obtuvo como resultado que no existe relación estadística entre la fuerza de agarre con mano derecha y mano izquierda , dado que p=0.006 era menor al α=0.05. De igual forma sucedió para la fuerza de pinza lateral con mano derecha y mano izquierda, donde se obtuvo un valor de p=0.01, menor al α=0.05. Al analizar la relación entre la fuerza (agarre, pinza lateral y palmar) con respecto al género se obtuvo que existía diferencia estadística entre hombres y mujeres. Finalmente, se analizó su relación con diferentes afectaciones del sistema musculoesquelético.
Тhe operability analysis of spindle-motor hybrid electromechanical systems
Authors: Oliinyk Katerina 
Published: October 2021

Motor-spindles are belong to a special class of complex dynamic systems of natural and natural-anthropogenic origin, which can be realized both translational and rotational motion, and represent a variety of developing species. Such systems are used in metalworking complexes, lathes, milling, drilling, grinding, multi-purpose and other machines. In modern designs of spindle units rolling bearings, hydrostatic, hydrodynamic, gas-static (aerostatic), gas-dynamic (aerodynamic), magnetic bearings and their combinations (hybrids) are used, for example, gas-magnetic (gas-static bearings with a magnetic suspension that allows to provide rotational frequencies) up to 10-20 thousand rpm, and in drilling and milling and grinding up to 100-200 thousand rpm and above. With the further development of technology in the machine-building industry, motor-spindles began to appear, which are able to realize the movement of the feed by means of gears and couplings, using pneumatic systems. They are also able to realize the movement of in using hydraulic systems, using screw gears. The design concepts of hybrid and combined the motor spindles, received by results of structural anticipation on the basis of use of innovative synthesis methods of hybrid electromechanical systems are considered. Results of mechanical calculations of rigidity and electromagnetic calculations are presented in the article. On the ground of the calculation data the operability analysis of the electromechanical systems of motor spindles is made. To develop a morphological model, functional features were selected, which are systematized and divided into three groups in accordance with the modular principle.
Impoving the quality of products created by additive technologies on the basisi of tig welding
Authors: Salenko Alexander , Kostenko А. , Tsurkan D. , Samoilenko Oleksii , Chencheva Olga , Shchetinin Viktor 
Published: October 2021

The paper deals with the issues of obtaining the minimum waviness of surfaces formed by additive processes of TIG welding. It is known that the geometric parameters of the melt bead, which form a reproducible workpiece layer by layer, are determined by both the energy and kinematic characteristics of the process. In this case, the laying of the rollers occurs with optimal overlap, as a result of which it is possible to achieve the maximum density of the model, however, with the simultaneous appearance of a certain waviness due to thermodynamic phenomena in the melt bath. The proposed model of the formation of a bead of melt, the use of which made it possible to establish the rational conditions for laying out the layers. Experimental studies of the process of argon-arc surfacing of models of a given, regression equations for determining the controlled waviness parameter are obtained.
It is shown that the waviness parameter is influenced by dynamic phenomena and wave processes that develop under the action of a system of forces during the formation of a melt bead. An improvement in the quality of products is seen in the optimization of the methods of forming the rollers, in ensuring the dynamic stability of the movement of the working head, ensuring the appropriate overlap of the trajectories of movement along the layers of the layout by an amount of 0.5e, establishing a rational arc length, and maintaining the dynamic stability of the arc burning.
The response surfaces of the objective functions in the planes of the process parameters are constructed, which provide a clear illustration of the dependence of the controlled geometric parameters on the welding modes.
Сверхширокополосная СВЧ биконическая антенна с высоким усилением для двухдиапазонных систем кругового радиомониторинга
Authors: Дубровка Федор Федорович , Пильтяй Степан Иванович 
Published: October 2021

В работе предложена, разработана, оптимизирована и экспериментально исследована новая всенаправленная сверхширокополосная СВЧ биконическая антенна с коэффициентом усиления больше 10 дБ. Главной особенностью разработанной биконической антенны является возможность ее использования в соосных двухдиапазонных системах кругового радиомониторинга. Возможность размещения двух всенаправленных антенн с разными рабочими диапазонами частот на одной оси обеспечивается подачей питания в биконической антенне с помощью коаксиальной линии передачи, во внутреннем проводнике которой проходит коаксиальная линия питания второй антенны с меньшими размерами проводников. Для обеспечения высокого коэффициента усиления биконической антенны (более 10 дБ при диаметре 21λ0) в конструкции использована осесимметричная диэлектрическая линза, предназначенная для выравнивания фазового фронта на апертуре в сверхшироком диапазоне частот с коэффициентом перекрытия 2,3:1. Применение оптимальной диэлектрической линзы позволяет достичь того же значения коэффициента усиления при диаметре антенны, который в 5 раз меньше, чем при отсутствии линзы. Достоверность полученных теоретических результатов подтверждена хорошим согласованием рассчитанных характеристик с измеренными характеристиками разработанного экспериментального образца биконической антенны. Предлагаемая сверхширокополосная всенаправленная биконическая антенна может быть рекомендована для применения в современных и перспективных системах кругового радиомониторинга, радиоразведки, передачи информации и радиопротиводействия.
8-канальный направленный ответвитель ортогональных мод Н21 в круглом волноводе для квазимоноимпульсных антенных систем Х-диапазона
Authors: Дубровка Федор Федорович , Пильтяй Степан Иванович , Овсяник Юрий Антонович , Дубровка Роман Ростиславович 
Published: October 2021

В статье представлены результаты численных исследований и оптимизации характеристик 8-канального направленного ответвителя (НО) ортогональных типов волн H21 в круглом многомодовом волноводе для квазимоноимпульсной системы высокоточного автоматического сопровождения низкоорбитальных спутников дистанционного зондирования Земли. Разработана конструкция и проведены испытания опытного образца, работающего в Х-диапазоне частот 8–8,5 ГГц. Предлагаемая простая и надежная конструкция НО обеспечивает одновременное, практически идеальное деление мощности волны H21 на 4 равные части. При этом получены коэффициент связи в пределах от –6,04 до –6,2 дБ, хорошее согласование (КСВН < 1,12), высокая развязка (I > 31 дБ) и направленность (D > 25 дБ). Коэффициенты трансформации рабочей волны Н21 в волны других типов в круглом волноводе НО меньше –70 дБ. Изготовленный опытный образец разработанного 8-канального направленного ответвителя испытан в расширенном Х-диапазоне частот 7,7–8,5 ГГц. Измеренные значения КСВН не превышают 1,25 для волн типа H11 с ортогональными круговыми поляризациями. Измеренная развязка прямоугольных волноводных каналов трекингового сигнала от информационного сигнала в круглом волноводе превышает 32 дБ.
A robust control design approach for altitude control and trajectory tracking of a quadrotor
Authors: Gulshan Z. A. , Ali M. Z. H. , Shah M. S. , Nouman D. , Anwar M. , Ullah M. F. 
Published: October 2021

Introduction. Unmanned aerial vehicles as quadcopters, twin rotors, fixed-wing crafts, and helicopters are being used in many applications these days. Control approaches applied on the quadrotor after decoupling the model or separate altitude control and trajectory tracking have been reported in the literature. A robust linear H∞ controller has been designed for both altitude control and circular trajectory tracking at the desired altitude. Problem. The ability of the quadrotor system to hover at a certain height and track any desired trajectory makes their use in many industrial applications in both military and civil applications. Once a controller has been designed, it may not be able to maintain the desired performance in practical scenarios, i.e. in presence of wind gusts. Originality. This work presents the control strategy to ensure both altitude control and trajectory tracking using a single controller. Purpose. However, there is a need for a single controller that ensures both altitude control and trajectory tracking. Novelty. This paper presents a robust H∞ control for altitude control and trajectory tracking for a six degree of freedom of unmanned aerial vehicles quadrotor. Methodology. Multi input multi output robust H∞ controller has been proposed for the quadrotor for altitude control and tracking the desired reference. For the controller validation, a simulation environment is developed in which a 3D trajectory is tracked by the proposed control methodology. Results. Simulation results depict that the controller is efficient enough to achieve the desired objective at minimal control efforts. Practical value. To verify that the proposed approach is able to ensure stability, altitude control, and trajectory tracking under practical situations, the performance of the proposed control is tested in presence of wind gusts. The ability of the controller to cater to the disturbances within fractions of seconds and maintaining both transient and steady-state performance proves the effectiveness of the controller.
Nuevos registros y hospederos del isópodo Telotha henselii (Isopoda: Cymothoidae) en la Amazonia ecuatoriana
Authors: Anaguano Yancha Fernando , Pilatasig Chusin Ana Lucia 
Published: October 2021

En Ecuador, el conocimiento del parasitismo de isópodos sobre peces es escaso. Hasta la fecha, se tiene conocimiento de que únicamente cuatro especies de este orden parasitan peces en la Amazonía ecuatoriana. En este artículo, se reportan los primeros registros de infestación de Telotha henselii sobre loricáridos para la región Amazónica ecuatoriana, con base en especímenes recolectados en el Río Quimi, sureste del país. Telotha henselii es un ectoparásito hematófago, que se localiza principalmente en la cavidad branquial o en la musculatura de los peces. La intensidad parasitaria varió de uno a dos isópodos por hospedero y la prevalencia fue de 16.6 % en Chaetostoma breve y 12.5 % en Chaetostoma carrioni.
A Massively Parallel Restriction-Smoothed Basis Multiscale Solver on Multicore and GPU Architectures
Authors: Manea A. M. 
Published: October 2021

Abstract
Due to its simplicity, adaptability, and applicability to various grid formats, the restriction-smoothed basis multiscale method (MsRSB) (Møyner and Lie 2016) has received wide attention and has been extended to various flow problems in porous media. Unlike the standard multiscale methods, MsRSB relies on iterative smoothing to find the multiscale basis functions in an adaptive manner, giving it the ability to naturally adjust to various complex grid orientations often encountered in real-life industrial applications. In this work, we investigate the scalability of MsRSB on various state-of-the-art parallel architectures, including multicore systems and GPUs. While MsRSB is-like most other multiscale methods-directly amenable to parallelization, the dependence on a smoother to find the basis functions creates unique control- and data-flow patterns. These patterns require careful design and implementation in parallel environments to achieve good scalability. We extend the work on parallel multiscale methods in Manea et al. (2016) and Manea and Almani (2019) to map the MsRSB special kernels to the shared-memory parallel multicore and GPU architectures. The scalability of our optimized parallel MsRSB implementation is demonstrated using highly heterogeneous 3D problems derived from the SPE10 Benchmark (Christie and Blunt 2001). Those problems range in size from millions to tens of millions of cells. The multicore implementation is benchmarked on a shared memory multicore architecture consisting of two packages of Intel® Cascade Lake Xeon® Gold 6246 CPU, while the GPU implementation is benchmarked on a massively parallel architecture consisting of NVIDIA Volta V100 GPUs. We compare the multicore implementation to the GPU implementation for both the setup and solution stages. Finally, we compare our parallel MsRSB scalability to the scalability of the parallel algebraic multiscale solver (AMS) on multicore (Manea et al. 2016) and GPU (Manea and Almani 2019) architectures. To the best of our knowledge, this is the first parallel implementation and demonstration of the versatile MsRSB method on the GPU architecture.
Analysis of PCDDs/PCBs by AhR-CALUX assay in Indian dietary food and environment ash
Authors: Nakamura Masafumi , Ko Shunkei , Govarthanan Muthusamy , Krishnamoorthi Vimalkumar 
Published: October 2021

Abstract
This study found distribution of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDD/Fs) and dioxin like polychlorinated biphenyls (DL-PCBs) in bovine milk and ash samples collected from 9 different major districts namely Erode, Salem, Namakkal, Coimbatore, Trippur, Madurai, Chennai, Dindigul and Tiruchirappalli, which were highly populated and industrialized districts of South India (Tamil Nadu). The total toxic equivalency (TEQ) for PCDD/Fs and DL-PCBs in the bovine milk samples were ranged from 0.028 to 7.331-pg TEQ/g fat. Some of the districts showed higher PCDD/Fs and DL-PCBs concentration in milk and ash samples. Further, BM14 (7.331 pg-TEQ/g fat) and BM21 (6.406 pg-TEQ/g fat) sampling sites showed exceed level of PCDD/Fs and DL-PCBs than WHO regulation limits (6 pg-TEQ/g fat). Similarly, Total dioxins and DL-PCBs concentration in the ash sample were between 0.003-1. ng TEQ/g. Samples from AS3 (1.2 ng-TEQ/g) and AS11 (1.06 ng-TEQ/g) showed higher total dioxins and DL-PCBs level among other sampling sites. This study provides an overview of dioxins and dioxin-related compounds contamination in bovine milk and ash samples in south Tamil Nadu. Further, the CALUX assay method validation has simplified the monitoring of dioxin contamination in the environment.
Psychological Distress of Testing Positive for Human Papillomavirus at Routine Prenatal Visits: A Prospective Observational Study among Chinese Pregnant Women with Normal Cytology
Authors: Hu Yifan , Gu Liying , Hong Zubei , Yu Hong , Zhang Yu , Lin Jianhua , Qiu Lihua , Di Wen 
Published: October 2021

Abstract
Background To explore the psychological impact of the positive HPV result on pregnant women with normal cytology. Methods The psychological distress level of HPV-positive women was compared with those of HPV-negative women before the results were notified. After the notification, the distress level of women in the HPV-positive group was assessed for the 2nd time and 3rd time before colposcopy and 2 weeks post-colposcopy. The lifestyle characteristics, knowledge of cervical cancer and screening behavior were compared between groups. Logistic regression was used to assess associations between socio-demographic, lifestyle, knowledge and risk of elevated distress level. Results No statistical difference of the distress level (as measured by PHQ-9 and GAD-7) was found between HPV-positive and -negative women. Within HPV-positive group, low distress level remained through all three time-points, regardless of HPV subtypes or colposcopy diagnoses. Half of the participants were suboptimally screened before this study conducted; 7.6% were aware of the causal relationship between HPV and cervical cancer. Post-graduate degree was associated with elevated PHQ-9 score. Conclusions HPV screening was unlikely to cause additional psychological distress among pregnant population in China.
The Effect of a Life Care Specialist on Pain Management and Opioid-Related Outcomes Among Patients with Orthopaedic Trauma: Study Protocol for a Randomized Controlled Trial
Authors: Giordano Nicholas A. , Aspang Jesse Seilern und , Baker J'Lynn , Rice Cammie Wolf , Barrell Bailey , Kirk Lauren , Ortega Erika , Wallace Michelle , Steck Alaina , Schenker Mara 
Published: October 2021

Abstract
Background:Orthopaedic trauma patients face complex pain management needs and are frequently prescribed opioids, leaving them at-risk for prolonged opioid use. To date, post-trauma pain management research has placed little emphasis on individualized risk assessments for misuse and systematically implementing non-pharmacologic pain management strategies. Therefore, a community-academic partnership was formed to design a novel position in the healthcare field (Life Care Specialist (LCS)), who will educate patients on the risks of opioids, tapering usage, safe disposal practices, and harm reduction strategies. In addition, the LCS teaches patients behavior-based strategies for pain management, utilizing well-described techniques for coping and resilience. This study aims to determine the effects of LCS intervention on opioid utilization, pain control, and patient satisfaction in the aftermath of orthopaedic trauma.Methods: In total, 200 orthopaedic trauma patients will be randomized to receive an intervention (LCS) or a standard-of-care control at an urban level 1 trauma center. All patients will be assessed with comprehensive social determinants of health and substance use surveys immediately after surgery (baseline). Follow-up assessments will be performed at 2-, 6-, and 12-weeks postoperatively, and will include pain medication utilization (morphine milligram equivalents), pain scores, and other substance use. In addition, overall patient wellness will be evaluated with objective actigraphy measures and patient-reported outcomes. Finally, a survey of patient understanding of risks of opioid use and misuse will be collected, to assess the influence of LCS opioid education.Discussion: There is limited data on the role of individualized, multimodal, non-pharmacologic, behavioral-based pain management intervention in opioid related risk-mitigation in high-risk populations, including the orthopaedic trauma patients. The findings from this randomized controlled trial will provide scientific and clinical evidence on the efficacy and feasibility of the LCS intervention. Moreover, the final aim will provide early evidence into which patients benefit most from LCS intervention. Trial registration: ClinicalTrials.gov NCT04154384. Registered on 11/6/2019 (last updated on 6/10/2021). https://clinicaltrials.gov/ct2/show/NCT04154384?term=life+care+specialist&draw=2&rank=1
Educational Intervention regarding Osteoporosis Knowledge among Nurses: A Comparative Cross-Sectional Survey
Authors: Nisa khair un , rehman atta , hani ume 
Published: October 2021

Abstract
Summary

We observed a positive relationship between awareness and educational intervention based on the facts on osteoporosis quiz. There are notable gaps in current nursing knowledge, particularly in terms of preventative strategies.
Purpose/Introduction

Osteoporosis is one of the main public health concerns and informative health intervention remains important in management of osteoporosis due to modifiable risk factors through non pharmacological approach. The purpose of the survey was to evaluate the awareness and intervention effect on knowledge regarding osteoporosis among nursing professionals.
Methods

The design of the research investigation was comparative cross-sectional. The Systematic technique was selected for data sampling from 278 nurses using roasoft. Facts on osteoporosis quiz was used for data collection before and after intervention. Health information brochure was used for educating nurses regarding osteoporosis.
Results

The response rate was 100 percent as all the 278 questionnaires were received back from respondents. Osteoporosis affects both genders was correctly identified by 70.9% nurses before intervention and 82.4% nurses after intervention. There is a weak relationship between bone health (r = 0.35, p = 0.000) strong association between risk factors (r = 0.70, p = 0.000) and treatment and prevention (r = 0.89, p = 0.000). Significant differences were observed by applying paired t-test statistics.
Conclusions

The findings of the survey concluded a statistically significant association between knowledge and educational intervention. There should be improved teaching in nurses’ syllabi in addition to ongoing nursing instruction programs such as seminars and workshops as deficiency of responsiveness related to osteoporosis was a barrier to adequate patient care.