bluuebunny/crossref_metadata_2025 huggingface dataset:
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.
Волноводно-планарный Е-плоскостной фильтр со сверхширокой полосой заграждения
Authors: Омельяненко Михаил Юрьевич , Романенко Тарас Владимирович , Туреева Ольга Васильевна
Published: October 2021

В статье предложен, разработан и экспериментально исследован волноводно-планарный полосно-пропускающий фильтр 2-см диапазона длин волн (13,5–14,5 ГГц) со сверхширокой полосой заграждения, достигающей 6-ой гармоники центральной частоты полосы пропускания. Фильтр с указанной полосой пропускания реализован на основе антиподальной волноводно-щелевой линии (АВЩЛ) с крайне высоким перекрытием гребней, характеризующимся отношением размера перекрытия к высоте волновода равным 0,773. Это позволило значительно уменьшить сечение волноводной камеры фильтра. В качестве входного и выходного трансформаторов фильтра использованы расположенные на той же подложке компактные волноводно-планарные трансформаторы, исключающие влияние неточности установки фильтрующей структуры относительно стыков с подводящими волноводами. Показано, что, несмотря на малость продольных размеров резонаторов по сравнению с половиной длины волны в АВЩЛ, синтез фильтра с приемлемой для практики точностью может быть проведен по методике Кона, модифицированной с целью учета указанной особенности. Вместе с тем, снижение собственной добротности резонаторов фильтра, связанное с сильным перекрытием гребней АВЩЛ, приводит к необходимости некоторой коррекции размеров. Показано, что необходимая коррекция может быть выполнена в одном из распространенных пакетов программ электродинамического анализа на основании результатов измерения собственной добротности резонаторов фильтра.
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.
Прогнозирование тренда затухания из-за дождя в связи с изменением климата в некоторых районах на юго-западе Нигерии
Authors: Семире Ф. А. , Адекюнле А. Дж. , Аболаде Р. О. , Адегбола О. А.
Published: October 2021

В последние годы проблема изменения климата становится глобальным явлением, оказывающим влияние на стабильность условий радиосвязи. Радиосигнал, передающий большой объем информации, замирает вследствие поглощения атмосферными газами, и рассеяния гидрометеорами, которые ограничивают доступность канала. Данная работа исследует эффекты, связанные с затуханием сигнала из-за дождя на пути «спутник–земля», с учетом тренда изменения климата в Нигерии. Интенсивности осадков, рассчитанные с использованием функции компенсации в модели Семире–Росмивати (Semire–Rosmiwati), применялись для оценки затухания сигнала из-за дождя, и определения длин эквивалентного пути при использовании модели ITU-R P.618-13 на спутнике NIGCOMSAT-1R при недоступности 0,01% для выбранных частот в Ku- и K-диапазонах. Кроме того, разработаны модели линейных трендов для годичных затуханий из-за дождя. В случае времени недоступности 0,01%, прогнозированное затухание из-за дождя в канале NIGCOMSAT-1R при использовании модели ITU-R P.618-13 находилось в диапазоне 14–28 дБ для Ku-диапазона, и превышало 40 дБ для K-диапазона. Проведенное исследование позволило установить, что тренды распределений интенсивности осадков соответствуют трендам затухания из-за дождя, и сделать вывод о том, что возрастающие годичные тренды пропадания сигнала на пути «земля–космос», вследствие возрастающей интенсивности дождевых осадков, обусловлены изменением климата в районе проведения исследований. Этот результат может быть использован для лучшего планирования и конструирования систем связи с тем, чтобы создать надежные каналы связи для удовлетворения спроса потребителей на качественную радиосвязь.
Ефективний високоточний аналіз тонкої несиметричної індуктивної діафрагми у прямокутному хвилеводі методом інтегральних рівнянь
Authors: Мартинюк Сергій Євстафійович , Дубровка Федір Федорович , Захарченко Оксана Степанівна , Степаненко Петро Якович
Published: October 2021

В статті запропоновано розв’язок електродинамічної задачі знаходження узагальненої матриці розсіювання нескінченно тонкої несиметричної односторонньої індуктивної діафрагми у прямокутному хвилеводі методом інтегральних рівнянь. Задача зведена до розв’язання системи інтегральних рівнянь по числу хвиль, що падають на неоднорідність із лівої часткової області. Ефективність нового розв’язку електродинамічної задачі досягається завдяки коректному врахуванню особливості тангенціального електричного поля у вікні діафрагми за допомогою поліномів Гегенбауера. Кожне інтегральне рівняння методом Гальоркіна зводиться до системи лінійних алгебраїчних рівнянь відносно комплексних коефіцієнтів розкладання тангенціального електричного поля у вікні діафрагми. Проведено чисельне дослідження отриманого розв’язку для визначення еквівалентних параметрів діафрагми в діапазоні частот, у якому уздовж хвилеводу може поширюватися без згасання лише основна хвиля. Підтверджено можливість ефективного високоточного обчислення узагальненої матриці розсіювання нескінченно тонкої несиметричної індуктивної діафрагми у прямокутному хвилеводі з урахуванням особливості тангенціального електричного поля на гострому ребрі у вікні діафрагми.
China Factor in Tajikistan: Prospects and Threats
Authors: Titarenko A.
Published: October 2021

Lately China has achieved impressive results in the utilization of logistical and natural resources of Tajikistan. The influence of Chinese “soft power” is also growing in the republic. The security cooperation has become a new important sphere of bilateral ties. Beijing has become an almost single source of financial and other resources for the leadership of Tajikistan trying to use it for social and internal stability purposes. As a result an economic, mainly debt, dependence of Dushanbe on China is growing. However the government of RT continues to follow the same course which may lead to the loss of the economic independence and even of the political one.
The Second Karabakh War and the Situation in the South Caucasus
Authors: Pritchin S.
Published: October 2021

The 44-day armed confrontation around Nagorno-Karabakh in September–November 2020 between Armenia and Azerbaijan was called the Second Karabakh War. A new full-fledged confrontation has radically changed the geopolitical situation around the region and, for the first time since the beginning of the conflict in the 90s of the last century, created prerequisites for the normalization of relations between the warring parties. The trilateral truce statement signed on November 10, 2020 by the heads of Russia, Azerbaijan and Armenia lays down the conditions for opening the borders blocked due to the confrontation, launching transport links in the region and gradually restoring relations between neighbors. At the same time, the contradictions accumulated during the conflict, distrust and negative mutual perception of Armenians and Azerbaijanis are still a serious obstacle to the full-fledged normalization of relations in the South Caucasus.
Byelorussian-Ukrainian Economic Relations: Political Aspect
Authors: Gronsky A.
Published: October 2021

After the Byelorussian presidential elections in 2020, there was a turning point in the Ukrainian- Byelorussian relations, but there were almost no changes in the sphere of economic cooperation. In the first half of 2020, Byelorussia and Ukraine actively cooperated in the economic sphere. Minsk's resistance to integration with Russia was supported by Ukraine. Kiev also depended on fuel supplies from Byelorussia. Despite the political confrontation that began in August 2020, Minsk and Kiev have maintained stable economic relations. In the first half of 2021, political antagonism intensified. However, this situation did not have a clear negative impact on the economic relations between Byelorussia and Ukraine.
Quantitative Microbiological Analysis of Artisanal Stretched Cheese Manufacture
Authors: Lehotová Veronika , Antálková Veronika , Medveďová Alžbeta , Valík Ľubomír
Published: October 2021

To evaluate the behaviour of the relevant microbial populations during stretched cheese production, the quantitative microbiological analysis was performed during the critical steps of the preparation. The obtained data distributions proved statistically significant increases in all indicators, on average by 4.55 ± 0.64 log CFU/g of presumptive lactococci counts, 4.06 ±0.61 of lactobacilli, 1.53 ± 0.57 log CFU/g of coliforms, 2.42 ± 0.67 log CFU/g of Escherichia coli, 1.53 ± 0.75 log CFU/g of yeasts and moulds, and 0.99 ± 0.27 log CFU/g of presumptive Staphylococcus aureus, from the early stage of milk coagulation until curd ripening (0–24 h). The following steaming/stretching process caused reductions in viable counts with the most significant inactivation effect on coliform bacteria, including E. coli (-4.0 ± 1.0 log CFU/g). Total viable counts and yeasts and moulds showed 2 and almost 3 log reduction (-2.2 ± 1.1 log CFU/g and -2.6 ± 0.9 log CFU/g), respectively. The lowest decreases in presumptive S. aureus counts were estimated at the level of -1.50 ± 0.64 log CFU/g. The counts of yeasts and moulds showed the best indicatory function during the entire storage period of vacuum-packaged cheeses at 6 °C.
Exact Solutions for a Novel H2 Optimal Design of Electromagnetic Tuned Mass Damper
Authors: Li Ge , Mao Qibo , Luo Yifan , Wang Yong , Liu Lei
Published: October 2021

To realize structural vibration control,a two parameters H2 optimization design was proposed to optimize the tuning ratio and damping ratio for electromagnetic tuned mass damper (EMTMD). The control effect of this two parameters optimization design is better than that of classical tuned mass damper (TMD).For this two parameters optimization,the most important thing is that the inductance of the coil can be set very small and the external load resistance can be positive ,which can avoid the use of complex negative impedance circuit. If Ref.[6] were designed according to the H2 optimization of two parameters, the EMTMD can be used for multi-modal vibration control of structures without connecting negative inductance and negative resistance spontaneously.
The Role of the School in Preparing Students to Lead a Healthy Lifestyle
Authors: Umiastowska Danuta , Kopeć-Pławińska Lila
Published: October 2021

Preparation of students for adult life also includes the area of health care. Health education is part of the core curriculum of Polish schools. The leading role of the health educator is assumed by the physical education teacher, but many other educational tasks are carried out by all school staff. The present study attempts to answer the question: How is health education implemented at school? The research project was carried out among students of various colleges in the city of Szczecin in Poland. At the same time, similar studies were conducted among students from other university in other cities. The research method was a diagnostic survey, with the main assessment tool being the ‘Questionnaire for Assessment of Implementation of Physical Education at Secondary School’ by Krystyna Górna-Łukasik from the Jerzy Kukuczka Academy of Physical Education in Katowice. On the basis of the study results, an attempt was made to determine the forms and methods of work and the involvement of various types of teachers in health education. The statistical analysis sought correlations between the students' opinions about the ways in which the curriculum content was implemented, university majors, and PE teachers’ sex.
A Hybrid Methodology Based on Smart Management Energy Consumption in Irrigation Systems
Authors: Scarlatache Florina , Grigoras Gheorghe , Scarlatache Vlad-Andrei , Neagu Bogdan-Constantin , Ivanov Ovidiu
Published: October 2021

Innovative practices in irrigation systems can bring improvements in terms of economic efficiency and in the same time can reduce environmental impact. Investment in high tech technologies frequently involves additional costs, but an efficient water management can increase the lifetime of the equipment. The main objective of this article is to reduce the energy consumption by one thousand cubic meters pumped and automatically to increase the economic efficiency of the pumping groups. This paper develops a new operating algorithm that ensures the operation of the pumping group at safe operating intervals and in the same time identifies the equivalent pump operating points for the entire flow range and pumping height of the pumping group. This methodology is based on the principles of an Expert System to perform the optimization process of the energy consumption in pumping groups. The resulting methodology avoids the combinatorial explosion of the solutions to be analyzed and determines the point of maximum efficiency without violation of any of the system constraints under any operating condition. The proposed methodology is tested on an irrigation system that includes a pumping group with 5 pumps, showing its effectiveness in obtaining the optimal solution with a relatively low computational burden.
Role of Disulfide Bonds and Sulfhydryl Blocked by N-Ethylmaleimide on the Properties of Different Protein-Stabilized Emulsions
Authors: Wu Mangang , Li Zhikun , Wei Ranran , Luan Yi , Hu Juan , Wang Qingling , Liu Rui , Ge Qingfeng , Yu Hai
Published: October 2021

To investigate the role of sulfhydryl groups and disulfide bonds in different protein-stabilized emulsions, N-ethylmaleimide (NEM) was used as sulfhydryl-blocking agent to be added in the emulsion. The addition of NEM to block the sulfhydryl groups resulted in a reduction of the content of disulfide bonds formation, which enabled destruction of the internal structure of the protein molecule, and then decreased the restriction of protein membrane on the oil droplets. Furthermore, with NEM content increasing in the emulsion, a reduction of protein emulsifying activity and emulsion stability also occurred. At the same time, the intermolecular interaction of the protein on the oil droplet interface membrane was destroyed, and the emulsion droplet size increased with the NEM content in the emulsion. Although NEM blocking sulfhydryl groups not to form disulfide bonds has similar effects on three types of protein emulsion, the degree of myofibrillar protein (MP), egg-white protein isolate (EPI), and soybean protein isolate (SPI) as emulsifier had a subtle difference.
Recommendations for Effective and Sustainable Regulation of Biopesticides in Nigeria
Authors: Ashaolu Christine Abey , Okonkwo Chibuzor , Njuguna Elizabeth , Ndolo Dennis
Published: October 2021

The global trend towards increased demand for organic food, greener environments, and the integration of biological control agents into pest management strategies has greatly enhanced the need for biological pesticides (biopesticides). Biopesticides are generally environmentally friendly and are made from micro-organisms or other natural substances. Despite their great potential, relatively few have been registered and commercialised in Nigeria compared to other African countries such as South Africa and Kenya. Biological active agents are so diverse such that ap-plying the same safety standards or environmental conditions to all of them is almost impossible. A review of risk assessment processes and comparative assessments of Nigeria's biopesticide regulations with other developing African countries and developed regions was conducted. Prolonged field testing, lack of bridged risk assessments and technical checklists have been identified as key factors hampering the timely development and commercialisation of biopesti-cides in Nigeria. Recommendations on necessary changes to the existing Nigeria biopesticide regulations have been made. Risk assessment matrices for microbial and biochemical biopesti-cides and a scientific/technical checklist have also been developed. Harmonisation and data ex-change among other countries in the region will also enhance the advancement of scientific and technical knowledge for sustainable regulation and cross-border trade.
Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration
Authors: Bolyukh V. F. , Schukin I. S. , Lasocki J.
Published: October 2021

Purpose. The purpose of the article is to determine the influence of the initial displacement of the windings on the indicators of an electromechanical induction accelerator of a cylindrical configuration with pulsed excitation from a capacitive energy storage and with short-term excitation from an alternating voltage source. Methodology. To take into account the interrelated electrical, magnetic, mechanical and thermal processes, as well as a number of nonlinear dependencies, we use the lumped parameters of the windings, and the solutions of the equations describing these processes are presented in a recurrent form. The mathematical model of the accelerator takes into account the variable magnetic coupling between the windings during the excitation of the inductor winding. When calculating the parameters and characteristics of the accelerator, a cyclic algorithm is used. Results. At a frequency of an alternating voltage source of 50 Hz, the current amplitude in the armature winding is less than in the inductor winding. With an increase in the source frequency to 250 Hz, the phase shift between the winding currents decreases. The current in the inductor winding decreases, and in the armature winding it increases. The accelerating components of the force increase, and the braking ones decrease. With an increase in the source frequency to 500 Hz, the current density in the armature winding exceeds that in the inductor winding. In this case, the phase shift between the windings is further reduced. Originality. When a cylindrical accelerator is excited, the largest amplitude of the current density in the inductor winding occurs at the maximum initial displacement of the windings, but the amplitude of the current density in the armature winding is the smallest. The largest value of the current density in the armature winding occurs in the absence of an initial displacement. When excited from a capacitive energy storage, the electrodynamic force between the windings has an initial accelerating and subsequent braking components. As a result, the speed of the armature initially increases to a maximum value, but decreases towards the end of the electromagnetic process. When a cylindrical accelerator is excited from an alternating voltage source, a phase shift occurs between the currents in the windings, which leads to the appearance of alternating accelerating and decelerating components of electrodynamic forces. The accelerating components of the force prevail over the braking components, which ensures the movement of the armature. Practical value. At a frequency of an alternating voltage source of 50 Hz, the highest speed at the output of the accelerator vzf=0.5 m/s is realized at an initial displacement of the windings z0=6.2 mm, at a frequency of 250 Hz, the highest speed vzf=2.4 m/s is realized at z0=3.1 mm, and at a frequency of 500 Hz the highest speed vzf=2.29 m/s is realized at z0=2.3 mm.
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.
Energy efficiency of a 3-level shunt active power filter powered by a fuel-cell / battery DC bus with regulated duty cycles
Authors: Bourouis B. , Djeghloud H. , Benalla H.
Published: October 2021

Introduction. Nowadays, electrical energy is indispensable in industrial, tertiary and domestic appliances. However, its efficiency is becoming affected by the presence of the disturbances that appear in the electrical networks such as harmonics, unbalance, sags/swells, flickers …etc. Indeed, the disturbances cause a decrease in the power factor and an increase in the power losses. In this paper, the harmonic disturbance is considered and a 3-level shunt active power filter powered by a hybrid fuel-cell/battery DC is applied to mitigate current harmonic components from the electrical feeder. Aim. Studying the energy efficiency of a system based on a 3-level shunt active filter powered by a hybrid fuel-cell / battery DC bus. Methodology. It is a matter of finding the suitable formulas that express the efficiency and the relative power losses according to the load factor (which is the ratio between the short-circuit active power and the load active power) and the load power factor. The DC bus energy is controlled using an energy management algorithm that contributes in generating the required reference input currents and output voltages of the fuel-cell and the battery. The DC/DC converters control circuits are performed in a closed loop by means of regulated duty cycles. Results. The simulation results carried-out under MATLAB/Simulink environment show better filtering quality if compared with the case of open loop control of the DC/DC converters and lesser differences between the fuel-cell power, the battery power and their respective reference powers. Which concerns the energy efficiency, the results demonstrate that higher efficiency and lower relative power losses can be achieved only when higher load factor and load power factor are attained. Therefore, the compensating system of the power factor is very important to improve the energy efficiency.
Adaptive maximum power point tracking using neural networks for a photovoltaic systems according grid
Authors: Sahraoui H. , Mellah H. , Drid S. , Chrifi-Alaoui L.
Published: October 2021

Introduction. This article deals with the optimization of the energy conversion of a grid-connected photovoltaic system. The novelty is to develop an intelligent maximum power point tracking technique using artificial neural network algorithms. Purpose. Intelligent maximum power point tracking technique is developed in order to improve the photovoltaic system performances under the variations of the temperature and irradiation. Methods. This work is to calculate and follow the maximum power point for a photovoltaic system operating according to the artificial intelligence mechanism is and the latter is used an adaptive modified perturbation and observation maximum power point tracking algorithm based on function sign to generate an specify duty cycle applied to DC-DC converter, where we use the feed forward artificial neural network type trained by Levenberg-Marquardt backpropagation. Results. The photovoltaic system that we chose to simulate and apply this intelligent technique on it is a stand-alone photovoltaic system. According to the results obtained from simulation of the photovoltaic system using adaptive modified perturbation and observation – artificial neural network the efficiency and the quality of the production of energy from photovoltaic is increased. Practical value. The proposed algorithm is validated by a dSPACE DS1104 for different operating conditions. All practice results confirm the effectiveness of our proposed algorithm.
Fitoplancton de la provincia oceánica del mar Caribe colombiano. Diez años de historia
Authors: Ayala Galván Karen Del Carmen , Gutiérrez Salcedo José Manuel , Montoya Cadavid Erika
Published: October 2021

El Instituto de Investigaciones Marinas y Costeras y la Agencia Nacional de Hidrocarburos de Colombia han llevado a cabo investigaciones de línea base ambiental en bloques de exploración de hidrocarburos aguas afuera del mar Caribe colombiano, entre los años 2008 y 2018. Estas investigaciones han generado información taxonómica y ecológica del fitoplancton marino, obtenida bajo diferentes métodos. El objetivo del presente trabajo fue unificar dicha información, certificando su veracidad. Para ello se organizaron matrices de datos, depurando la información, actualizando la taxonomía, categorizándola al nivel taxonómico de género, y estandarizando la abundancia. Aquí se pone a disposición una base de datos del fitoplancton oceánico del mar Caribe colombiano, con 5720 registros, a 2440 de los cuales se adicionaron abundancias. En general, este conjunto de datos recopila información de 8 proyectos, 14 cruceros, 12 bloques de exploración, 120 estaciones, y 304 lotes de muestras mixtas de fitoplancton, donde se registraron 135 géneros distribuidos en 80 familias, 45 órdenes, 9 clases y 7 fila. La abundancia se estandarizó a células por litro, obteniéndose un rango entre 9.6 y 7790.0 cél.L-1.
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.
Diversity of Geadephaga (Coleoptera: Carabidae and Cicindelidae) in Colombia: an approach from existing literature
Authors: Arenas Anderson , Montoya-Lerma James , Moret Pierre
Published: October 2021

The beetle families Carabidae and Cicindelidae, with about 40 000 species worldwide, play an increasing role in biodiversity conservation and ecological studies in Colombia, which makes a faunistic update all the more necessary. We present and analyze a checklist of the species so far described or registered from Colombia until 2020, based on published studies, and their distribution data at the department level. Carabidae are represented by 625 species and Cicindelidae by 100. Magdalena, Cundinamarca and Valle del Cauca are the departments with the highest record numbers of Carabidae, while Cicindelidae are most frequently cited from Valle del Cauca, Antioquia and Meta. The greater sampling effort in these regions is likely due to the accessibility of their natural areas from the main towns. The geographical distribution of Cicindelidae is better documented, with only 17 % of the species without mention of specific localities within the country, against 40 % in Carabidae. Hyper-diverse regions, such as the Chocó and the Amazon, are underrepresented. The number of species currently recorded is therefore estimated to be much lower than true diversity for both families.
The Relationship Between Emotional Support With Psychological Well-Being In Students In Vocational High Schools
Authors: Agustina Faizatul , Widyastuti Widyastuti
Published: October 2021

This study aims to determine the relationship between emotional support and psychological well-being in students. This research method is quantitative with a correlational approach. The variables in this study are emotional support as the independent variable and psychological well-being as the dependent variable. This research was conducted at SMKN 1 Grati with a sample of 333 students who were taken by the sampling method used was probability sampling method with simple random sampling technique. namely the sampling technique by providing equal opportunities for each element. Data analysis was performed by Pearson product moment correlation analysis using SPSS 23 for windows program. The results showed that there was a positive relationship between emotional support and psychological well-being for students at SMKN 1 Grati. The results showed that the correlation coefficient was 0.562 with a significance level of 0.000 <0.05, which means that the hypothesis in this study can be accepted. With an effective contribution of 31.6%, which means that emotional support affects the level of psychological well-being of students.
A Comparative Study on the Behavior of Adolescents Raised by Normal Families and Broken Home Families in Keboan Anom Village, Gedangan, Sidoarjo
Authors: Hariyadi Anita Tri Maharani , Istikomah Istikomah
Published: October 2021

The purpose of this study is (1) to find out the behavior of adolescents who are raised by normal families. (2) knowing the behavior of teenagers who are raised by broken home families and (3) knowing the comparison or differences in the behavior of teenagers who are raised by normal families and broken home families. The research method used a mixed method research or a combination of quantitative and qualitative with a population of 150 teenagers living in RW.03, RW.05 and RW.06 and obtained a sample of 60 teenagers to study. Then the data analysis technique used in the study used the independent sample t-test formula. Based on the research that has been done, the results of the research are as follows: (1) the behavior of adolescents who are cared for by normal families using an average analysis technique that has been through validity and reliability tests gets a score of 3.95 which is in the interval of 3.67 – 5.00 which means that the behavior of adolescents is quite good. (2) and the behavior of adolescents who are cared for by broken home families using an average analysis technique that has been through validity and reliability tests obtains a score of 2.72 which is in the interval 2.34 - 3.66, which means that adolescent behavior is classified as poor. . (3) based on the independent sample t-test test output in the equal variances assumed section, it is known that the value of sig.(2-tailed) is 0.000 <0.05.
The Relationship Between Body Image And Psychological Well Being In Senior High School Students
Authors: Syabana Amaliyah , Ansyah Eko Hardi
Published: October 2021

This research is motivated by the phenomenon of psychological well being experienced by students. The purpose of this study was to determine the relationship between body image and psychological well being in students of SMA Muhammadiyah 4 Porong. This research is a quantitative research with correlational quantitative method. The population in this study were all students of SMA Muhamadiyah 4 Porong, totaling 62 students. The sample in this study amounted to 62 students with saturated sampling technique. In the data collection technique, the researcher uses a psychological scale, this type of data collection uses a Likert scale in the form of a body image scale (ɑ = 0.797) and a psychological well being scale (ɑ = 0.948). The data analysis technique used Pearson's product-moment correlation with the help of SPSS 22.0. The results of the data analysis of this study indicate that the correlation coefficient (rxy) is 0.246 with a significance of 0.027 <0.05, which means that there is a significant positive relationship between body image and psychological well being in students of SMA Muhamadiyah 4 Porong. The effect of body image on psychological well being in this study was 6.1%.
Strategies to Improve Mathematics Learning Outcomes Through Flipped Classroom
Authors: Afdillah Nurin , Rindaningsih Ida
Published: October 2021

The purpose of this study was to analyze the presence or absence of and how much influence the flipped classroom learning model had on the mathematics learning outcomes of fractions. This research was conducted at MI Nurul Huda Candi Sidoarjo for the 2020/2021 Academic Year. This study uses quantitative research with a sample of 40 students. The data collection after the treatment was carried out using the Mathematics Learning Outcomes Test for fractions. The results showed that there were differences in learning outcomes between students who were taught using the flipped classroom learning model and students who were taught using the conventional learning model with a value (tcount = 2,041 > ttable = 2, 024) at a significance level of 5%. it can be concluded that there is an effect of the flipped classroom learning model on the mathematics learning outcomes of fifth grade students at MI Nurul Huda Candi Sidoarjo. The large influence of the flipped classroom learning model on the mathematics learning outcomes of fifth grade students at MI Nurul Huda Candi Sidoarjo is 6.87%.
A Massively Parallel Restriction-Smoothed Basis Multiscale Solver on Multicore and GPU Architectures
Authors: Manea A. M.
Published: October 2021

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

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

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

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

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.