bluuebunny/crossref_metadata_2025 huggingface dataset:
Импульсное лазерное облучение светоизлучающих структур со слоем (Ga,Mn)As
Authors: Звонков Б.Н. , Вихрова О.В. , Данилов Ю.А. , Демина П.Б. , Дорохин М.В. , Дроздов М.Н. , Здоровейщев Д.А. , Калентьева И.Л. , Кузнецов Ю.М. , Кудрин А.В. , Нежданов А.В. , Парафин А.Е. , Хомицкий Д.В.
Published: June 2021

InGaAs/GaAs heteronanostructures with a (Ga,Mn)As layer on the surface were fabricated by MOCVD epitaxy and pulsed laser deposition, and the effect of a pulsed excimer laser (wavelength 248 nm, pulse duration ~ 30 ns) on their radiative, structural and galvanomagnetic properties was studied. The radiation energy density was varied in the range from 200 to 360 mJ/cm2. In the studies, photoluminescence spectroscopy was used, which makes it possible to analyze the polarization characteristics of the radiation of the structures. The crystalline perfection of the initial and laser-irradiated samples was studied using Raman spectroscopy. The elemental composition of the structures and its depth distribution were studied by secondary ion mass spectrometry. The effect of pulsed laser annealing on the ferromagnetic properties of heteronanostructures was characterized by the behavior of the magnetic field dependences of the Hall resistance and magnetoresistance at temperatures of 10–300 K in the range of magnetic fields ± 3600 Oe. At room temperature, the study was carried out in magnetic fields reaching values of ± 28000 Oe. To obtain the calculated temperature distributions along the sample thickness and in time using a model of the laser annealing process based on solving the problem of heat propagation in a one-dimensional GaAs system taking into account the (Ga,Mn)As layer on the surface, we used the original data on the thermal conductivity coefficient of structures with a layer (Ga,Mn)As obtained using a modified frequency separation technique (3ω-method).
Отрицательное магнитосопротивление в структуре n-InSb/ЖИГ
Authors: Никулин Ю.В. , Кожевников А.В. , Хивинцев Ю.В. , Селезнев М.Е. , Филимонов Ю.А.
Published: June 2021

It is shown that for the n-InSb/YIG/GGG (YIG - yttrium iron garnet, GGG - gallium-gadolinium garnet) structure in the tangent to the substrate plane geometry of magnetization (H <10 kOe) at a temperature T≈300 K the magnetoresistance of about 1% is negative, while for n-InSb/GGG structure, in the same magnetization geometry, the magnetoresistance is positive (an increase in electrical resistance in a magnetic field). The negative magnetoresistance effect in the InSb/YIG/GGG structure is due to the influence of the YIG magnetization on the conduction electrons of InSb (proximity effect) and the magnitude of the effect is determined by the value of YIG magnetization and parameters of InSb films.
Интерференция магнитоупругих волн в пленке железо-иттриевого граната
Authors: Высоцкий С.Л. , Кожевников А.В. , Филимонов Ю.А.
Published: June 2021

Экспериментально исследована интерференция встречно распространяющихся в пленке железо-иттриевого граната магнитоупругих волн, возбуждаемых и принимаемых токовыми антеннами. Показано, что с помощью регулировки фазы и амплитуды одной из взаимодействующих волн на частотах вблизи частот магнитоупругих резонансов может быть обеспечена чувствительность уровня сигнала на выходной антенне к изменению величины поля подмагничивания более 250 dB/Oe. Обнаруженный эффект может быть полезен при разработке датчиков магнитного поля. Ключевые слова: интерференция, магнитоупругие волны, датчик магнитного поля.
Магнитоиндуцированный нелинейно-оптический отклик плeнок на основе нанослоeв тяжeлых и ферромагнитного металлов
Authors: Радовская В.В. , Мамонов Е.А. , Новиков В.Б. , Копылов Д.А. , Колмычек И.А. , Гусев Н.С. , Пашенькин И.Ю. , Мурзина T.В.
Published: June 2021

We present the results of the experimental studies of magnetization-induced effects in optical second harmonic generation (SHG) from three-layer W/Co/Pt films with different thicknesses of the cobalt layer (2-10 nm) influenced by longitudinal dc magnetic field. The intensity effect in the p-polarized second harmonic that is odd in magnetization was observed, which reveals an increase in the corresponding magnetic contrast of the SHG intensity with an increase of the cobalt layer thickness from 2 nm to 10 nm. A phenomenological description of the observed effects was carried out when considering the bulk nonlinear polarization at the SHG frequency, which is proportional to the magnetization gradient in the direction normal to the structure, as well as the interface contribution, which is proportional to the square of the magnetization of the films.
Термоиндуцированное изменение поля переключения планарных CoNi-микрочастиц, сформированных на поверхности монокристаллического ниобата лития
Authors: Бизяев Д.А. , Нургазизов Н.И. , Бухараев А.А. , Чукланов А.П. , Шур В.Я. , Ахматханов А.Р.
Published: June 2021

Методами магнитно-силовой микроскопии были исследованы магнитные свойства (поле переключения) и переходы из многодоменного в однодоменное состояние планарных микрочастиц Co18Ni82 размером 7.5x7.5x0.03 μm3 при различных температурах. Использование в качестве подложки гексагонального монокристалла ниобата лития, обладающего отличающимися температурными коэффициентами линейного расширения вдоль разных кристаллографических осей, позволило индуцировать одноосные механические напряжения в микрочастицах путем относительно небольшого нагрева или охлаждения образца по сравнению с его температурой напыления. Показано, что за счет термоиндуцированного магнитоупругого эффекта увеличение температуры всего на 50 K может привести к семикратному уменьшению величины поля переключения. Ключевые слова: магнитоупругий эффект, магнитная силовая микроскопия, перемагничивание, ниобат лития, температура.
Управляемая электрическим полем спин-волновая связь в латеральных ансамблях магнитных микроструктур
Authors: Грачев А.А. , Бегинин Е.Н. , Шешукова С.Е. , Садовников А.В.
Published: June 2021

In this work, using numerical and experimental studies, we have demonstrated the possibility of controlling the dipole spin-wave coupling in a lateral array of ferromagnetic stripes using local deformations. As an experimental demonstration of the investigated physical processes, a configuration of a magnonic structure with a piezoelectric layer and structured electrodes on its surface is proposed, and the technique of laser ablation with spatial resolution is used to structure the piezoelectric layer. The mechanisms for controlling the dipole coupling of spin waves by creating elastic deformations localized in the region of the maximums of the electric field are revealed. From an applied point of view, the results obtained can be used to create a class of information processing devices, such as demultiplexing systems with frequency-space selectivity, controlled simultaneously by an electric and magnetic field.
Оптимизация параметров системы ферромагнетик/туннельный барьер/неколлинеарный ферромагнетик для генерации электромагнитного излучения
Authors: Караштин Е.А.
Published: June 2021

Исследована возможность генерации электромагнитного излучения при переходе электронов проводимости между спиновыми подзонами неколлинеарного ферромагнетика в системе ферромагнетик/туннельный барьер/неколлинеарный ферромагнетик. В такой системе инжекция неравновесного спина в неколлинеарный ферромагнетик осуществляется с помощью электрического тока, поляризованного по спину первым однородным ферромагнетиком. Показано, что в случае, когда оба ферромагнетика являются "плохими" металлами или полупроводниками, можно добиться существенного снижения критического тока генерации по сравнению со случаем, когда ферромагнетики --- "хорошие" металлы. Полученные оценки для критического тока являются экспериментально реализуемыми. Прикладывая к системе напряжение различной величины, можно управлять частотой излучаемой системой электромагнитной волны. Ключевые слова: неколлинеарный ферромагнетик, обменное взаимодействие, спин-орбитальное взаимодействие, туннельный магнитный контакт.
Синтез, структура и магнитные свойства многослойных наногетероструктур Fe|MgO|Cr|MgO|Fe
Authors: Якунина Е.М. , Кравцов Е.А. , Khaydukov Yu.N. , Антропов Н.О. , Проглядо В.В.
Published: June 2021

Layered nanoheterostructures Fe | MgO | Cr | MgO | Fe is an artificial ferromagnetic material in which the exchange interaction of the magnetic moments of Fe layers through intermediate dielectric and metal layers can lead to magnetic configurations that are not realized in the well-studied Fe | MgO | Fe and Fe | Cr | Fe. In this work, we investigated the correlations of the structural and magnetic properties of layered nanoheterostructures Fe (10 nm) | MgO (1.5 nm) | Cr (t nm) | MgO (1.5 nm) | Fe (7 nm) (thickness t = 0.9 and 1.8 nm). Structural studies performed using X-ray diffractometry and high-resolution reflectometry confirmed the formation of a textured structure and revealed its well-defined layered character with sharp interlayer boundaries.
Температурная зависимость напряжения, вызванного спиновым током в гетероструктуре манганит/иридат
Authors: Шайхулов Т.А. , Станкевич К.Л. , Константинян К.И. , Демидов В.В. , Овсянников Г.А.
Published: June 2021

The temperature dependence of the voltage induced by the spin current was studied in an epitaxial thin-film La0.7Sr0.3MnO3 / SrIrO3 heterostructure deposited on a single-crystal NdGaO3 substrate. The spin current was generated by microwave pumping under conditions of ferromagnetic resonance in the La0.7Sr0.3MnO3 ferromagnetic layer and was detected in the SrIrO3 layer due to inverse spin Hall effect. A significant increase of half-width of the spin current spectrum along with the rise of amplitude of the spin current upon cooling from room temperature (300 K) to 135 K were observed.
Оценка характеристик однофотонного детектора в зависимости от параметров сверхпроводящей пленки W-=SUB=-x-=/SUB=-Si-=SUB=-1-x-=/SUB=-
Authors: Хыдырова С.Ю. , Степанов И.А. , Васильев Д.Д. , Моисеев К.М.
Published: June 2021

The absorption efficiency, cut-off wavelength, and recovery time of a superconducting nanowire single-photon detector were calculated as functions of the surface resistance Rs and the critical temperature Tc of the WxSi1-x film. The calculated dependences for the SNSPD on WxSi1-x films show that films with Tc > 3.5 K and 300 < Rs < 420 Ω/sq will provide ηabs ≈ 15...20%, ηIDE = 100% at a wavelength of 1550 nm and the recovery time τ < 40 ns, which corresponds to the possible SNSPD count rate CRmax = 25 MHz.
Описание степени усиления нанокомпозитов полимер/углеродные нанотрубки: предел "термита"
Authors: Козлов Г.В. , Долбин И.В.
Published: June 2021

For the description of properties of nanocomposites polyurethane/carbon nanotube the model of two-component random blends in limit of “termite” (random superconductive network) was used. This model is correct and gives precise enough quantitative description of reinforcement degree of the considered nanocomposites. For receiving of precise description of the indicated characteristic it is necessary to consider the structure of carbon nanotubes as ring-like formations and critical index in “termite” limit is defined by fractal dimension of these formations. The proposed model allows to elucidate the criterion of creation of high-modulus nanocomposites of this class.
Немонотонная скоростная зависимость динамического предела текучести сплавов в условиях высокоскоростной деформации
Authors: Малашенко В.В.
Published: June 2021

Теоретически исследовано скольжение краевых дислокаций в состаренном бинарном сплаве в условиях высокоскоростной деформации (high strain rate deformation). Получено аналитическое выражение для скоростной зависимости динамического предела текучести. Получены условия, при которых график скоростной зависимости может иметь два максимума и два минимума. Существование двух максимумов связано с наличием двух типов дефектов, значительно отличающихся своими размерами (атомы второго компонента и зоны Гинье-Престона). Минимумы имеют место при переходе от доминирования динамического торможения (drag) одним типом дефектов к доминированию дефектов другого типа. Максимумы возникают при изменении характера торможения доминирующими дефектами. Ключевые слова: дислокации, высокоскоростная деформация, дефекты, зоны Гинье-Престона.
Сверхтонкое и квадрупольное взаимодействия в ЭПР изотопов -=SUP=-153-=/SUP=-Eu-=SUP=-2+-=/SUP=- и -=SUP=-151-=/SUP=-Eu-=SUP=-2+-=/SUP=- в иттрий-алюминиевом гранате
Authors: Потапов А.П. , Важенин В.А. , Петросян А.Г. , Ованесян К.Л. , Асатрян Г.Р. , Артёмов М.Ю.
Published: June 2021

In specially grown single crystals of yttrium-aluminum garnet, the orthorhombic centers 153Eu2+ and 151Eu2+ were investigated. The parameters of hyperfine and quadrupole interactions, which describe the hyperfine structure of the EPR spectrum of both isotopes, are determined.
Упругие свойства нанокристаллических кубических сульфидов Ag-=SUB=-2-=/SUB=-S и ZnS
Authors: Садовников С.И.
Published: June 2021

The structure of Ag2S/ZnS heteronanostructures is considered taking into account the anisotropy of the elastic properties of Ag2S and ZnS sulfides. It is shown that a large amount of cubic zinc sulfide stabilizes the cubic structure of beta-Ag2S argentite at 300 K during the deposition of Ag2S/ZnS heteronanostructures from colloidal solutions. The elastic stiffness constants c11, c12, and c44 of cubic argentite beta-Ag2S and sphalerite ZnS are estimated at a temperature of 300 K. Physically possible variants of the arrangement of silver atoms at fixed crystallographic positions of cubic argentite are determined. It is shown that the energetically most favorable is the formation of beta-Ag2S heterostructures, in which the interface is formed by the (hk0) plane of ZnS sphalerite and the (hk 0.5) plane of beta-Ag2S argentite. Calculation of the universal criterion for the anisotropy of the elastic properties of cubic argentite beta-Ag2S and sphalerite ZnS showed that the studied silver and zinc sulfides are elastically anisotropic.
Фотофизические свойства тонких пленок перилена, модифицированного функциональными группами диангидрида и диимида тетракарбоновой кислоты
Authors: Комолов А.С. , Лазнева Э.Ф. , Жижин Е.В. , Алиджанов Э.К. , Лантух Ю.Д. , Летута С.Н. , Раздобреев Д.А.
Published: June 2021

The morphology of organic semiconductor films of perylenetetracarboxylic acid dianhydride (PTCDA) and perylenetetracarboxylic acid dibenzyl-diimide (N, N`-DBPTCDI) formed by thermal vacuum deposition was studied by atomic force microscopy. It was shown that annealing of films at 420 K leads to rearrangement of their structure and crystallization. The optical absorption spectra of the films under study were used to estimate the optical band gap. The temperature dependence of the dark conductivity of PTCDA and N, N-DBPTCDI films before and after annealing (Т = 420 K) was established. The values of the activation energy of charge carrier traps are determined. The computer simulation of the density of localized states in the band gap of the films studied was carried out using the photoconductivity spectra in the constant photocurrent mode. Model photovoltaic cells based on PTCDA / СuPc and N, N-DBPTCDI / СuPc structures were formed. The kinetics of decay of the interfacial photo-voltage of the cells prepared was measured using pulsed light as an excitation source. On the basis of the performed measurements, the charge carrier mobility values in the investigated semiconductor materials were estimated.
Модовая фильтрация поверхностных магнитостатических волн в YIG/FeRh
Authors: Одинцов С.А. , Амиров А.А. , Грачев А.А. , Родионова В.В. , Садовников А.В.
Published: June 2021

A numerical study of the features of the propagation of spin waves in a waveguide made of yttrium-ron garnet (YIG) and Fe-Rh alloy in the form of a plate, located on top of the central part of the YIG, has been carried out. Based on the simulation results, the possibilities of controlling the dynamics of spin waves in the structure under study were also revealed. Micromagnetic numerical simulation was used to study the transfer of a spin-wave signal in a multimode mode by numerically solving the Landau – Lifshitz – Hilbert equation. Transformation of the transmission spectra of spin waves shows that the proposed structure will make it possible to control the propagation of spin-wave modes due to a sharp change in the Fe-Rh magnetization in the region of the magnetic phase transition temperature close to room temperature. In addition, the spin wave signal can be controlled by a small temperature change in the Fe-Rh plate generated by laser radiation. The two-layer structure of YIG/Fe-Rh, from an applied point of view, can be used as a functional unit in planar magnon networks performing space-frequency demultiplexing and filtering of spin-wave modes.
Магнитокалорический эффект в окрестности температуры магнитной компенсации аморфных ферримагнитных пленок Gd-Co
Authors: Свалов А.В. , Архипов А.В. , Лепаловский В.Н. , Степанова Е.А. , Васьковский В.О. , Курляндская Г.В.
Published: June 2021

The magnetic and magnetocaloric properties of amorphous ferrimagnetic Gd-Co films with perpendicular magnetic anisotropy were studied in a wide range of fields and temperatures. The change in the sign of the magnetocaloric effect near the compensation temperature occurs almost abruptly when the magnetic field is oriented perpendicular to the film plane. In a certain temperature range, it happens when the field is oriented along the plane of the sample. The most probable reason for the blurring of this transition is the appearance of a non-collinear magnetic structure.
Магнон-фононное взаимодействие в переходном слое эпитаксиальной пленки ЖИГ
Authors: Тихонов В.В. , Губанов В.А. , Садовников А.В.
Published: June 2021

Показано, что в переходном слое эпитаксиальной пленки ЖИГ возникают эффекты коллинеарного магнитоупругого взаимодействия обменных спиновых (ОСВ) и акустических волн (АВ). Наиболее интенсивное взаимодействие происходит на частотах фазового синхронизма ОСВ и АВ. При этом появляются эффекты гибридизации и преобразования энергии ОСВ -> АВ. Выполнение условия синхронизма обеспечивается трансформацией длин ОСВ в пределах толщины переходного слоя. Вдали от точек синхронизма связь ослабляется, волны распространяются независимо друг от друга. При этом акустическая волна может беспрепятственно излучаться вглубь немагнитной подложки пленки железоиттриевого граната. В перспективе это может быть полезным для обеспечения фононной связи спин-волновых возбуждений в пленках, расположенных на противоположных сторонах немагнитной подложки. Ключевые слова: спиновые волны, магноника, фотоника, эпитаксиальные пленки.
Особенности вырождения основного состояния спин-псевдоспиновой модели двумерного магнетика вблизи точки фрустрации
Authors: Ясинская Д.Н. , Улитко В.А. , Панов Ю.Д.
Published: June 2021

The classical Monte Carlo method is used for the study of properties of the ground state and phase transitions of the spin-pseudospin model describing a two-dimensional Ising magnet with competing charge and spin interactions. This competition causes ground state degeneracy and frustration. It is shown that the ground state degeneracy is observed in the frustration area with nonzero probabilities of the formation of two different ordered states. Based on histogram analysis of Monte-Carlo data, the type of phase transitions is analyzed. It is found that first order phase transitions are observed near the frustration point, depending on the relationship between the spin s = 1/2 and pseudospin S = 1 interactions.
Исследование диэлектрического отклика, проводимости и тока термостимулированной деполяризации в релаксорном сегнетоэлектрике PbNi-=SUB=-1/3-=/SUB=-Nb-=SUB=-2/3-=/SUB=-O-=SUB=-3-=/SUB=-
Authors: Полушина А.Д. , Обозова Е.Д. , Залесский В.Г. , Смирнова Т.А. , Лушников С.Г.
Published: June 2021

This paper presents results of a study of temperature dependences of dielectric response and DC and AC - conductivity in single crystals of the relaxor ferroelectric PbNi1/3Nb2/3O3 (PNN) in a wide range of frequencies (10 Hz - 100 kHz) and temperatures (80 - 750 K). Anomalies in the dielectric response in the form of broad frequency-dependent maxima in the vicinity of 153 and 730 K are observed. The thermal activation character of DC conductivity has been obtained, and activation energies determined as Ea = 770 meV (T > 310 K) and Ea = 23 meV (T <310 K). The analysis of conductivity gives reason to assume the existence of local conductivity in the low-temperature region. It is shown that the conductivity character changes above 350 K from the local to the bulk one. Measurement by thermally stimulated depolarization has shown the presence of a residual polarization below 130 K.
Анизотропия оптических свойств пленок гексагонального нитрида бора
Authors: Котова Л.В. , Алтынбаев Л.А. , Жукова М.О. , Hogan B.T. , Балдычева А. , Курбатов Д.М. , Кочерешко В.П.
Published: June 2021

Тонкие пленки гексагонального нитрида бора толщиной несколько моноатомных слоев были изготовлены путем расщепления объемных образцов в ультразвуковой ванне. Исследовались спектры пропускания, отражения и фотолюминесценции таких пленок. Были измерены спектральные зависимости линейной и круговой поляризации прошедшего через образец света. Исследование с помощью сканирующей электронной микроскопии показало однородность полученных образцов. Однако исследование параметров Стокса прошедшего через образец света позволило установить наличие скрытой анизотропии оптических свойств этих пленок. Ключевые слова: нитрид бора, оптическая анизотропия, спектроскопия, поляризация, тонкие пленки.
The Effectiveness of a Multidisciplinary Electronic Discharge Readiness Tool: Prospective, Single-Center, Pre-Post Study
Authors: Keniston Angela , McBeth Lauren , Pell Jonathan , Bowden Kasey , Metzger Anna , Nordhagen Jamie , Anthony Amanda , Rice John , Burden Marisha
Published: June 2021

Background

In the face of hospital capacity strain, hospitals have developed multifaceted plans to try to improve patient flow. Many of these initiatives have focused on the timing of discharges and on lowering lengths of stay, and they have met with variable success. We deployed a novel tool in the electronic health record to enhance discharge communication.

Objective

The aim of this study is to evaluate the effectiveness of a discharge communication tool.

Methods

This was a prospective, single-center, pre-post study. Hospitalist physicians and advanced practice providers (APPs) used the Discharge Today Tool to update patient discharge readiness every morning and at any time the patient status changed throughout the day. Primary outcomes were tool use, time of day the clinician entered the discharge order, time of day the patient left the hospital, and hospital length of stay. We used linear mixed modeling and generalized linear mixed modeling, with team and discharging provider included in all the models to account for patients cared for by the same team and the same provider.

Results

During the pilot implementation period from March 5, 2019, to July 31, 2019, a total of 4707 patients were discharged (compared with 4558 patients discharged during the preimplementation period). A total of 352 clinical staff had used the tool, and 84.85% (3994/4707) of the patients during the pilot period had a discharge status assigned at least once. In a survey, most respondents reported that the tool was helpful (32/34, 94% of clinical staff) and either saved time or did not add additional time to their workflow (21/24, 88% of providers, and 34/34, 100% of clinical staff). Although improvements were not observed in either unadjusted or adjusted analyses, after including starting morning census per team as an effect modifier, there was a reduction in the time of day the discharge order was entered into the electronic health record by the discharging physician and in the time of day the patient left the hospital (decrease of 2.9 minutes per additional patient, P=.07, and 3 minutes per additional patient, P=.07, respectively). As an effect modifier, for teams that included an APP, there was a significant reduction in the time of day the patient left the hospital beyond the reduction seen for teams without an APP (decrease of 19.1 minutes per patient, P=.04). Finally, in the adjusted analysis, hospital length of stay decreased by an average of 3.7% (P=.06).

Conclusions

The Discharge Today tool allows for real time documentation and sharing of discharge status. Our results suggest an overall positive response by care team members and that the tool may be useful for improving discharge time and length of stay if a team is staffed with an APP or in higher-census situations.
Toward a Central Bank Collateral Framework for ABMI
Authors: Choi Gongpil
Published: June 2021

The post-global financial crisis highlighted the importance of engaging in collateralized securities financing to meet the ever-increasing market needs for liquidity and risk management. Given the heavy reliance on volatile Eurodollar system and the fragmented governance and limited cross-border usability of the collateral among ASEAN+3 countries, it is important to relax prevailing constraints on collateral and mobilize cross-border transactions. To address the imperatives for securing collateral-based cross-border financial markets in the region, Asia needs the initiatives of central banks to develop a regional collateral framework for better financial plumbing. By collaborating on common grounds for cross-border collateral utilization, some of the prevailing constraints on collateral use can be relaxed. The inclusive collateral framework that incorporates CBCA (Central Bank Collateral Arrangement) would provide strong initial market support for the ABMI, thus help achieve sustainable financial stability.
Variations in Low Electrical Stimulator Voltage Settings Minimally Influence Beef Longissimus Muscle Slice Shear Force Values
Authors: Arp Travis S. , Rice Emily , Woerner Dale R. , Kathoh Kenichi , Smith Gary C. , Belk Keith E. , Nair Mahesh N.
Published: June 2021

The objective of the current study was to evaluate the effect of differing electrical stimulation (ES) voltage levels on beef longissimus muscle tenderness, postmortem temperature, pH decline, and carcass quality. Beef carcasses from 3 commercial beef processing plants (A, B, C) were exposed to 3 varying voltage levels: (1) control (no ES), (2) ES level 1 (ES1; 60 Hz for 17 s each at 16, 20, 24, and 28 V), and (3) ES level 2 (ES2; 60 Hz for 17 s each at 25, 35, 45, and 55 V) prior to chilling. Ninety beef carcasses were selected from each of the 3 plants, and within a carcass, paired sides were randomly assigned to one of 3 ES treatments (n = 60 sides/treatment/plant). The results indicated that ES affected (P < 0.05) muscle pH at 3 h postmortem in 2 of the 3 plants. However, ES did not affect (P > 0.05) pH at the time of grading (postrigor). Although the slice shear force (SSF) values were lower (P < 0.05) for ES steaks compared with controls, voltage did not affect (P > 0.05) SSF values. Variation in SSF was observed among the plants (P < 0.05), with steaks from Plant C having greater (P < 0.05) SSF values compared with steaks from Plants A and B, which exhibited similar (P > 0.05) SSF values. Overall, although ES steaks had lower SSF values compared with control steaks, the lack of difference in postmortem tenderness between ES1 and ES2 voltage settings indicated that the low ES voltages minimally influenced SSF values.
Perimembranous ventricular septal defect closure via ultra-minimal trans intercostal incision in children
Authors: Gao Zhan , Yu Jin , Zhang Zewei , Li Jianhua , Yu Jiangen
Published: June 2021

Aims：This study aimed to investigate the safety, feasibility and
availability of perimembranous ventricular septal defect (PmVSD) closure
via a left parasternal ultra-minimal trans intercostal incision in
children. Methods and results：From January 2015 to January 2019, 131
children with restrictive PmVSDs were enrolled in this study and
successfully done in 126 patients (96.18%). PmVSDs were occluded via an
ultra-minimal trans intercostal incision (≤1 cm), and the entire
occlusive process was guided and monitored by TEE. A pericardium hanging
technique was employed without sternal incision. PmVSDs were closed
through a short delivery sheath assembled using a concentric occluder
device. All patients were followed up for a perid ranging from18 months
to 24 months. Thirteen patients with PmVSD had aneurysm of membranous
septum (AMS). Multistream (more than or equal to 2) PmVSDs with AMS were
found in eleven cases. After the operation, mild residual shunt beside
the amplatzer occluder in one patient was found and had self-healing
result during the 5-month follow-up period. Five patients transferred to
ventricular septal defect repair operation under direct visualization
with a cardiopulmonary bypass. One reason was ventricular fibrillation
when guide wire passed the PmVSD, another was device dislocation, and
others were the guide wire cannot pass through the PmVSD.
Conclusions：PmVSDs closure using a concentric occluder via a left
parasternal ultra-minimal trans intercostal incision under TEE guidance
is feasible, safe, and effective in children. This approach can be
considered as an alternative treatment to open-heart surgery for
restrictive PmVSDs.
Molecular detection and phylogenetic analysis of Marek's disease virus oncogenes from vaccinated flocks in southern India reveals circulation of very virulent MDV genotype
Authors: Ramasamy Kannaki , Priyanka E. , Nishitha Y. , Krishna S. Vamshi , Haunshi Santosh , Subbiah Madhuri
Published: June 2021

Marek’s disease (MD) is a re-emerging viral disease of chicken and a
serious economic threat to poultry industry worldwide. Continuous
surveillance with molecular investigation is mandatory to monitor the
emergence of virulent MDV strains and to devise any appropriate
vaccination strategy and implement bio-security programs. In the present
study, we investigated the cases of MD outbreaks in vaccinated poultry
flocks. The MD outbreak was confirmed through necropsy (majorily
visceral tumors), histopathology and viral gene specific PCR. The
pathotypes of the field MDV strains were assessed by molecular analysis
of three oncogenes -Meq, pp38 and vIL-8. The Meq sequence of the field
strains analyzed in this study lacked the 59 aa unique to mild strains
indicating that they are virulent strains. Mutation at position 71 and
presence of five proline rich repeats in the transactivation domain,
both associated with virulence were observed in these strains, however,
the signature sequences specific to very virulent plus strains were
absent. Phylogenetic analysis of Meq gene sequences revealed clustering
of the field strains with North Indian strains and with a very virulent
plus ATE 2539 strain from Hungary. Analyses of pp38 protein at positions
107 and 109 and vIL-8 protein at positions 4 and 31 showed signatures of
virulence. Sequence and phylogenetic analysis of oncogenes from field
MDVs from vaccinated flock indicated these strains possessing molecular
features of very virulent strains. Our data shows here that Meq, vIL-8
and pp38 genes can be used as markers for molecular analysis to decipher
the pathotype of MDV strains. Our present study suggests evolution of
virulent MDV induced by vaccination.
Surgical excision of a cardiac hydatid cyst from the right ventricle in a child
Authors: Al-Dairy Alwaleed , Kasem Rahim Abo
Published: June 2021

Cardiac Hydatid Cysts are uncommonly encountered entity of hydatid
disease. Presentation may be with non-specific symptoms and sometimes
with life threatening events. We present a rare case of a 9-year-old
female who was diagnosed with a Cardiac Hydatid Cyst in the right
ventricle, and underwent successful surgical excision
Upper Gastrointestinal obstruction as an Unusual Presentation of Thoracoabdominal Huge Aortic Aneurysm; a Case Report
Authors: Jahanshahi Fatemeh , Davani Sam Zeraatian
Published: June 2021

We reported a case with complaint of abdominal pain, nausea, vomiting,
and oral intake intolerance due to a giant thoracoabdominal aortic
aneurysm with contained leak and acute rupture within the
circumferential mural thrombus which presented with upper
gastrointestinal obstruction manifestation. The rupture led to the
patient undergoing emergency aneurysm repair.
Red Blood Cell Distribution Width in Patients with Chronic Obstructive Lung Diseases: Alteration due to Severity of Exacerbation
Authors: Bekir Sumeyye Alparslan , Acaturk Eylem , Gungor Sinem , Yalcinsoy Murat , Sogukpinar Ozlem , Gundogus Baran , Aksoy Emine , Agca Meltem , Agca Sinem , Turker Hatice , Karakurt Zuhal
Published: June 2021

Background: Elevated red blood cell distribution width (RDW) levels were
associated with mortality in patients with stable chronic obstructive
lung diseases (COPD). There are limited data about RDW levels in COPD
exacerbation. Aim/Objective: The association of the RDW levels with the
severity of the acute exacerbation of COPD (AECOPD) were evaluated
according to admission location, (outpatient-clinic, ward and intensive
care unit (ICU). Methods: Cross sectional retrospective study designed
in tertiary chest dieases hospital. COPD patients admitted to hospital
outpatiens-clinic, ward and ICU due to AECOPD were included. Patients
demographics, RDW, C-reactive protein (CRP), biochemistry values were
recorded. RDW values were subdivided below 0.11% (low), above and equal
0.15% (high) and between 0.11-0.15% (normal). Neutrophile to
lymphocyte ratio (NLR) and platelet to mean platelet volume (PLT-MPV)
were also calculated. Recorded values were compared according to where
AECOPD was treated. Results: 2771 COPD patients (33% female) and 1429
outpatients-clinic, 1156 ward and 186 ICU were enrolled in the study.
The median RWD values in outpatients-clinic, ward and ICU were 0.16
(0.09-0.26), 0.07 (0.01-0.14) and 0.01 (0.00-0.07) respectively
(p<0.001). In outpatient to ward and ICU, low RDW values were
significantly increased (31%, 66%, 83% respectively) and high RDW
values significantly decreased (54%, 24%, 10%) (p<0.001).
According to attack severity, low RDW values were determined.
Conclusion: Patients with AECOPD, lower RDW values should be considered
carefully. Lower RDW can be used for decision of COPD exacerbation
severity and follow up treatment response. What is already known about
this topic; In current studies, elevated RDW levels were associated with
mortality in patients with stable COPD. What does this article add;
Currently , there are limited data about RDW levels in COPD
exacerbation. In the present study, the association of the RDW levels
according to the severity of AECOPD were evaluated due to admission
location.
Motivasi dan Hasil Belajar Bahasa Indonesia dalam Pembelajaran Make A Match Berbantuan Media Cerita Bergambar
Authors: Qomariyah Siti
Published: June 2021

Rendahnya motivasi belajar dan hasil belajar siswa pada pelajaran Bahasa Indonesia merupakan kendala yang dihadapi oleh guru. Akibatnya banyak siswa yang minat dalam belajar masih kurang dan kewalahan dalam menghadapi kesulitan. Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran make a match berbantuan media cerita bergambar terhadap motivasi belajar dan hasil belajar pelajaran Bahasa Indonesia siswa kelas IV. Populasi penelitian ini berjumlah 126 orang siswa di kelas IV. Teknik pengumpulan data yaitu tes esai dalam mengukur hasil belajar Bahasa Indonesia dan non tes berupa angket untuk mengukur motivasi belajar. Teknik analisis data menggunakan MANOVA. Hasil penelitian menunjukkan bahwa: Pertama, terdapat pengaruh yang signifikan model pembelajaran make a match berbantuan media cerita bergambar terhadap motivasi belajar (F=761,807, dengan Sig. <0,05). Kedua, terdapat pengaruh yang signifikan model pembelajaran make a match berbantuan media cerita bergambar terhadap hasil belajar Bahasa Indonesia (F=220,418, dengan Sig. <0,05). Ketiga, terdapat pengaruh model pembelajaran make a match berbantuan media cerita bergambar terhadap motivasi belajar dan hasil belajar Bahasa Indonesia (F=446,095, dengan Sig. <0,05). Jadi, dengan adanya model pembelajaran make a match berbantuan media cerita bergambar mempengaruhi motivasi belajar dan hasil belajar pelajaran Bahasa Indonesia siswa. Penggunaan model pembelajaran make a match berbantuan media cerita bergambar dapat mempermudah guru dalam melaksanakan pembelajaran dikarenakan pembelajaran akan berpusat pada siswa serta sebagai bahan untuk memilih model pembelajaran agar lebih bervariasi dengan tetap menyesuaikan dengan karakteristik siswa.
Pengembangan Media Kartu Bergambar Berorientasi Pendidikan Karakter Pada Mata Pelajaran Bahasa Bali
Authors: Nida Dewa Made Adi Andhika , Parmiti Desak Putu , Sukmana Adrianus I Wayan Ilia Yuda
Published: June 2021

Dilaksanakannya penelitian pengembangan ini pada dasarnya dilatarbelakangi oleh rendahnya hasil belajar Bahasa Bali siswa yang disebabkan oleh kurangnya media pembelajaran yang relevan. Tujuan dari penelitian ini yaitu untuk mendeskripsikan rancang bangun media kartu bergambar berorientasi pendidikan karakter, mendeskripsikan hasil uji validasi media kartu bergambar berorientasi pendidikan karakter, serta mengetahui efektivitas penerapan media kartu bergambarberorientasi pendidikan karakter. Model yang digunakan dalam penelitian pengembangan ini adalah model ADDIE. Data dikumpulkan dengan metode pencatatan dokumen, kuesioner, wawancara, dan tes tertulis. Hasil uji validasi yang dilakukan oleh para ahli dan kelompok mahasiswa subyek uji coba produk menunjukkan bahwa media kartu bergambar dinyatakan valid dengan rincian hasil yaitu: ahli mata pelajaran 100%, ahli desain pembelajaran 95,71%, ahli media pembelajaran 95,00%, uji coba perorangan 97,33%, uji coba kelompok kecil 97,55%, dan uji lapangan 98,00% dengan kualifikasi sangat baik. Berdasarkan uji efektifitas yang telah dilakukan menunjukkan bahwa media kartu bergambar berorientasi pendidikan karakter terbukti efektif meningkatkan hasil belajar Bahasa Bali siswa.
Sistem Personalisasi E-Learning Berorientasi Felder Silverman Learning Style Model Pada Mata Pelajaran Teknik Pengambilan Gambar
Authors: Pardomuan Gusti Nyoman Pardomuan Nyoman
Published: June 2021

Perkembangan e-learning saat ini terus semakin innovative, namun media e-learning masa kini kurang memperhatikan karakteristik belajar siswa salah satunya karakteristik gaya belajar menjadi suatu masalah belajar baru bagi peserta didik. Maka dari itu dikembangkan E-learning yang mampu mengakomodasi gaya belajar siswa sehingga menjadi semakin adaptif (menyesuaikan) dengan adanya personalisasi e-learning yang dapat mendeteksi karakteristik dan kebutuhan individu dari siswa. Penelitian ini bertujuan menciptakan sebuah personalisasi e-learning untuk lingkungan sekolah menengah kejuruan, Penelitian ini bertujuan untuk mengembangkan sebuah media ajar berupa system perosonalisasi e-learning berorientasi Felder Silverman Learning Style Model (FSLSM) pada siswa kelas XI jurusan multimedia di SMK Negeri 1 Sukasada yang menjadi salah satu solusi untuk meningkatkan hasil belajar siswa. Metode penelitian yang digunakan adalah metode pengembangan ADDIE. Subjek dalam penelitian ini adalah ahli isi pembelajaran, ahli media pembelajaran, ahli desain pembelajaran, siswa perorangan, siswa kelompok kecil, dan siswa dalam uji coba lapangan. Variabel yang diteliti dalam penelitian ini adalah e-learning berorientasi FSLSM dan hasil belajar siswa kelas XI Multimedia di SMK Negeri 1 Sukasada. Data penelitian dikumpulkan dengan menggunakan instrumen wawancara lisan, kuisioner, dan tes hasil belajar. Data hasil penelitian dianalisis secara deskriptif kualitatif, deskriptif kuantitatif, dan statistik inferensial (uji-t). Hasil analisis data menunjukkan bahwa telah berhasil dirancang sebuah system personalisasi e-learning berorientasi FSLSM untuk pembelajaran teknik pengambilan gambar dan telah valid untuk digunakan. Hasil analisis statistik inferensial menunjukkan bahwa e-learning berorientasi FSLSM efektif untuk meningkatkan hasil belajar siswa.
Pengembangan Multimedia Pembelajaran Interaktif untuk Meningkatkan Hasil Belajar IPS
Authors: Rahman Abdur , I Nyoman Jamper
Published: June 2021

Kurangnya media pembelajaran yang digunakan oleh guru dalam menyampaikan materi pelajaran IPS terpadu mengakibatkan siswa pasif dalam mengikuti kegiatan pembelajaran. Tujuan penelitian ini adalah menjelaskan rancang bangun pengembangan multimedia interaktif dengan model pengembangan ADDIE. Metode pengumpulan data yang digunakan adalah observasi, wawancara, kuesioner, dan tes. Analisis data yang digunakan adalah teknik deskriptif kualitatif, deskriptif kuantitatif dan analisis statistik inferensial dengan dilakukan uji prasyarat. Validitas media diuji coba kepada ahli isi mata pelajaran diperoleh 96,00% dalam kategori sangat baik, ahli media pembelajaran diperoleh 78,00% dalam kategori baik, uji coba perorangan diperoleh 86,88  % dalam kategori sangat baik, kelompok kecil diperoleh 94,33% dalam kategori sangat baik dan uji coba lapangan diperoleh 87,11 dalam kategori sangat baik. Berdasarkan uji efektivitas terdapat perbedaan yang signifikan antara hasil pretest dan posttest.  Dengan demikian dapat disimpulkan bahwa multimedia pembelajaran interaktif dapat meningkatkan hasil belajar siswa pada mata pelajaran IPS Terpadu sehingga multimedia pembelajaran interaktif efektif digunakan dalam proses pembelajaran sehingga multimedia pembelajaran intaraktif efektif digunakan dalam proses pembelajaran.
Penerapan Model Pembelajaran Kooperatif Tipe STAD Untuk Meningkatkan Hasil Belajar Tematik Pada Siswa Kelas III SD
Authors: Sukerti Ni Nyoman
Published: June 2021

Permasalahan umum yang seringkali terjadi dalam proses pembelajaran adalah kurang siapnya siswa dalam memulai pelajaran, walaupun mereka telah mengetahui materi yang akan disampaikan oleh guru dalam pembelajaran. Hal ini secara langsung terlihat dari kurang aktifnya siswa dalam mengikuti pembelajaran, Hal ini berdampak pada kurang optimalnya hasil belajar siswa. Permsalahan ini semakin diperkuat oleh pemanfaatan metode pembelajaran yang masih konvensional oleh guru. Guru lebih memilih menggunakan metode ceramah dan tanya jawab yang bersifat klasikal. Akibatnya siswa kurang antusias dalam mengikuti pelajaran sehingga suasana kelas nampak pasif. Untuk mengoptimalkan hasil belajar siswa maka perlu dilakukan inovasi pembelajaran yakni dengan menerapkan menerapkan model pembelajaran kooperatif tipe STAD. Penelitian ini adalah penelitian tindakan kelas yang  bertujuan untuk meningkatkan hasil belajar siswa kelas III SD dengan menerapkan model pembelajaran kooperatif tipe Student Teams Achievement Division (STAD).  Penelitian ini dilaksanakan sebanyak 2 siklus. Rancangan masing-masing siklus terdiri dari perencanaan, pelaksanaan, observasi/evaluasi dan refleksi. Berdasarkan data yang diperoleh dapat disimpulkan bahwa bahwa penerapan model pembelajaran kooperatif tipe STAD dapat meningkatkan hasil belajar tematik siswa  kelas III SD Negeri 2 Kampung Baru semester II tahun pelajaran 2019/2020. Hal ini terlihat dari peningkatan hasil belajar siswa yaitu pra siklus sebesar 66,33% yang tergolong cukup, siklus I sebesar 74,00% yang tergolong cukup dan meningkat pada siklus II sebesar 79,33% yang tergolong baik.
Peran Model Pembelajaran Group Investigation Berbasis Media Lingkungan Terhadap Kompetensi Pengetahuan IPA
Authors: Mulyadinata I Putu Lagas , Wiyasa I Komang Ngurah , Suniasih Ni Wayan
Published: June 2021

Pada muatan materi IPA masih banyak ditemukan siswa yang asyik mengobrol dengan teman kelompoknya sehingga hanya beberapa orang saja yang memperhatikan materi yang dijelaskan oleh guru. Penelitian ini memiliki tujuan untuk mengetahui pengaruh model pembelajaran group investigation berbasis media lingkungan terhadap kompetensi pengetahuan IPA. Jenis pada penelitian ini ialah eksperimen semu dengan menggunakan rancangan non-equivalent control grup design. Polulasi yang terdapat pada penelitian ini adalah sebanyak 174. Sampel diambil menggunakan teknik cluster random sampling untuk menentukan kelompok eksperimen dan juga kelompok kontrol. Pengumpulan data untuk kompetensi pengetahuan IPA mempergunakan instrumen tes objektif sebanyak 30 soal yang sudah diujikan instrumen dengan validitas, uji daya beda, indeks kesukaran, dan reliabilitas. Hasil perolehan data kemudian dianalisis dengan uji-t polled varians. Perolehan dari analisis data yaitu thitung = 2,979 > ttabel = 1,993 pada taraf signifikansi 5% dengan dk = 72, jadi, H0 ditolak dan Ha diterima. Maka, terdapat perbedaan yang signifikan kompetensi pengetahuan IPA antara kelompok eksperimen dan kelompok kontrol. Jika dilihat dari nilai rata-rata gain skor ternormalisasi kompetensi pengetahuan IPA kelompok eksperimen adalah 0,4 lebih dari kelompok kontrol adalah 0,23. Simpulan dari hal tersebut adalah model pembelajaran group investigation berbasis media lingkungan berpengaruh terhadap kompetensi pengetahuan IPA. Hasil penelitian ini dapat digeneralisasikan di populasi penelitian. Hal ini berarti bahwa model pembelajaran Group Investigation berbasis media lingkungan dapat diterapkan.
Peran Pembelajaran CLIS Menggunakan Media Animasi Bagi Kompetensi Pengetahuan IPA
Authors: Dewi Ni Luh Iin Shinta , Suniasih Ni Wayan
Published: June 2021

Tujuan dari penelitian ini adalah untuk mengkaji pengaruh model pembelajaran Children Learning in Science (CLIS) menggunakan media animasi terhadap kompetensi pengetahuan IPA. Jenis penelitian ini menggunakan eksperimen semu dengan desain penelitian Nonequivalent Control Group Design. Sampel pada penelitian ini ditentukan dengan teknik classter random sampling, yang menghasilkan dua kelompok sampel yakni kelompok eksperimen dengan jumlah siswa 31 orang dan kelompok kontrol dengan jumlah siswa 30 orang. Data kompetensi pengetahuan IPA siswa dikumpulkan dengan metode tes objektif. Rata – rata gain skor ternormalisasi pada kelompok ekperimen adalah  = 0,829 dan pada kelompok kontrol adalah  = 0,545. Data yang diperoleh dianalisis dengan menggunakan uji-t (polled varians) pada taraf signifikansi 5% dan derajat kebebasan 59 diperoleh thitung = 7,888 dan ttabel = 2,000. Dikarenakan thitung > ttabel maka, dapat disimpulkan bahwa model pembelajaran CLIS menggunakan media animasi berpengaruh terhadap kompetensi pengetahuan IPA.
Model Pembelajaran Team Assisted Individualization Berbantuan Multimedia Dalam Meningkatkan Kompetensi Pengetahuan IPA Kelas IV
Authors: Triyanti Komang , Asri I G.A. Agung Sri , Sujana I Wayan
Published: June 2021

Penelitian ini dilatar belakangi oleh rendahnya kompetensi pengetahuan IPA siswa. Penelitian ini dilaksanakan dengan tujuan untuk menganalisis pengaruh model pembelajaran team assisted individualization berbantuan multimedia terhadap kompetensi pengetahuan IPA kelas IV SD Gugus VI Blahbatuh Tahun Pelajaran 2019/2020 dengan jenis penelitian eksperimen semu menggunakan rancangan non-equivalent posttest only control group design. Populasi yang dilibatkan adalah seluruh kelas IV SD sebanyak 159 siswa. Penentuan sampel dipergunakan teknik cluster random sampling dengan melakukan pengundian. Jumlah sampel secara keseluruhan yaitu 64 siswa. Pengumpulan data menggunakan instrumen kompetensi pengetahuan IPA sejumlah 34 soal valid. Data berupa skor posttest kompetensi pengetahuan IPA dianalisis menggunakan uji t polled varian. Berdasarkan hasil analisis uji t, diperoleh thitung = 4,06 > ttabel = 2,00 pada taraf signifikansi 5% dengan dk = 62 maka H0 ditolak. Hal tersebut menyatakan bahwa terdapat perbedaan yang signifikan kompetensi pengetahuan IPA antara kelompok yang dibelajarkan dengan model team assisted individualization berbantuan multimedia dengan kelompok yang dibelajarkan dengan pembelajaran konvensional pada kelas IV SD Gugus VI Blahbatuh Tahun Pelajaran 2019/2020. Dengan demikian, simpulannya bahwa terdapat pengaruh model pembelajaran team assisted individualization berbantuan multimedia terhadap kompetensi pengetahuan IPA kelas IV SD Gugus VI Blahbatuh Tahun Pelajaran 2019/2020.