bluuebunny/crossref_metadata_2025 huggingface dataset:
Developing the system of instruments for business sector in order to transfer the environmental innovations effectively: case of Ukraine
Authors: Shkarupa Olena , Kalchenko Yelyzaveta , Shkarupa Ivan
Published: January 2020

The article analyzes the need to transfer the environmental innovations effectively in the system “enterprise-region-state” and to establish the relevant innovative changes promotion channels for the country’s sustainable development. The authors study this problem in the context of priority directions of UNO Sustainable Development Strategy and Sustainable Development Strategy “Ukraine – 2020”. Its solution is a key factor of influence on Ukraine’s economic growth and security. The study is based on methods for defining the influence of national economy innovative activity on the choice of relevant ecological modernization state regulation channels for sustainable development. FCM analysis was used for the study. Six groups of instruments were defined and characterized depending on the influence on sustainable development subjects. The system of instruments was formed, and the approach towards making the managerial decisions in order to ensure Ukraine’s national economy sustainable development was proposed. Practical value of the obtained results is that the established relevant channels can ensure the fastest reaction of business environment to state regulatory impact, which is the main constituent of state administration and sustainable development processes regulation system.
Модификация структурно-фазового состояния и электрических свойств медьсодержащих фуллеритовых пленок при термическом отжиге в вакууме
Authors: Баран Л. В.
Published: January 2020

Методами растровой и атомно-силовой микроскопии, рентгеновской дифракции, рентгеноспектрального микроанализа и дифракции отраженных электронов исследованы изменения структуры, элементного и фазового состава пленок фуллерит–медь с атомной долей металла 0.5, 1, 2 и 4%, осажденных на окисленные монокристаллические подложки кремния и подвергнутых термическому воздействию в вакууме при разных температурах (470, 520, 570 и 620 К). Установлено, что в результате термического отжига при Т = 520 К (t = 1 ч) формируется нанокристаллическая структура со средним размером структурных элементов 33, 42, 50 и 65 нм для пленок фуллерит–медь с атомной долей металла 0.5, 1, 2 и 4% соответственно. Повышение температуры и времени отжига приводит к увеличению размера структурных элементов и образованию новой фазы Cux C60, относящейся к моноклинной пр. гр. P2/m. Методом электросиловой микроскопии и четырехзондовым методом исследованы изменения локальных электрических свойств и удельного электросопротивления медьсодержащих фуллеритовых пленок при отжиге в вакууме.
Новые перспективные материалы на основе рекомбинантного и регенерированного шелка для медицины и конструкционных тканей
Authors: Тенчурин Т. Х. , Шариков Р. В. , Чвалун С. Н.
Published: January 2020

Одним из наиболее прочных природных материалов является паутина. Прочность ее нитей может достигать 1.3–1.5 ГПа, что сопоставимо с прочностью стали. Энергия ее разрушения достигает огромных значений 194–283 МДж/м3 , поэтому текстиль на основе паучьих нитей может найти применение в изготовлении композиционных элементов для летательных аппаратов и автомобилей. Волокна паука обладают высокой биосовместимостью, поддерживают жизнеспособность клеток и обладают антибактериальными свойствами и не вызывают иммунного ответа. Таким образом, они могут быть использованы для изготовления трехмерных пористых клеточных каркасов для целей тканевой инженерии. К несомненным достоинствам волокон паука относится то, что они не плавятся. Поэтому текстильные изделия из паучьего шелка можно использовать для изготовления армейской экипировки. К сожалению, производить паучий шелк с помощью массового разведения пауков невозможно. В связи с этим ведется разработка его синтетических аналогов с помощью технологии рекомбинантной ДНК. С целью создания отечественной технологии изготовления искусственного шелкового волокна и медицинских материалов в данном обзоре приводятся основные работы в области исследования реологических свойств растворов спидроина (основной материал паутины) и фиброина шелка, показывающие, как структурные превращения спидроина, индуцированные изменением pH, содержанием соли и напряжением сдвига, определяют его способность к самоорганизации в водных растворах. Приводится анализ важнейших работ в области мокрого, сухо-мокрого формования и электроформования волокон, а также сравнение механических свойств волокон рекомбинантного спидроина с соответствующими показателями природных волокон паука. Значительные успехи, достигнутые в последнее время в этой области, позволяют перейти к созданию волокнистых материалов нового поколения.
Морфология, химическая структура и катодные свойства наноструктурированных покрытий железа на высокоразвитой поверхности алюминия и пористого оксида алюминия
Authors: Валеев Р. Г. , Алалыкин А. С.
Published: January 2020

Представлены результаты исследований морфологии и химической структуры покрытий железа, осажденных методом термического осаждения на наноструктурированные поверхности алюминия и пористого оксида алюминия, до и после проведения катодных реакций выделения водорода. Показано, что увеличение диаметров пор на поверхности оксида алюминия не приводит к изменению плотности катодного тока вследствие различного вклада границ между порами в общую площадь образца, тогда как увеличение размеров полусферических углублений на поверхности пластин алюминия приводит к возрастанию плотности катодного тока, что свидетельствует об увеличении эффективности выделения водорода. Изменений морфологии и химической структуры поверхности до и после проведения реакции не выявлено.
Adsorption behavior of Cr(VI) by N-doped biochar derived from bamboo
Authors: Chu Bei , Terao Kento , Amano Yoshimasa , Machida Motoi
Published: January 2020

In this study, N-doped biochar BZ-9.5AG-30 min was prepared from bamboo by using ZnCl2 as activator and heat treated at 950 °C under NH3 gas flow for the removal of Cr(VI). The adsorbent was characterized by BET, and the amount of introduced nitrogen content and nitrogen species on BZ-9.5AG-30 min was examined by CHN elemental analyzer and X-ray photoelectron spectroscopy, respectively. Herein, the obtained BZ-9.5AG-30 min had a high specific surface area (1,610 m2/g) and high N content (4.52%). The pH of the solution had a great influence on the adsorption process, indicating that the acid condition is conducive to the adsorption process of Cr(VI). Adsorption equilibrium data of Cr(VI) were analyzed by the Langmuir and the Freundlich models. The adsorption equilibrium data were well described by the Langmuir model, and BZ-9.5AG-30 min has excellent adsorption capacity for Cr(VI) (4.31 mmol/g). BZ-9.5AG-30 min showed superior recyclability, and after five times regenerations, the adsorption capacity of BZ-9.5AG-30 min still had 63% of the initial adsorption capacity.
Geleneksel Tekstil Ürün Tasarımlarının Değerlendirilmesi: Şanlıurfa Elbise Örtüleri
Authors: Akpınarlı Feriha , Arslan Pınar
Published: January 2020

Kültür bir milletin kendine ait yaşamındaki parçalardan oluşturmaktadır. Gelenek, görenek, din, dil, tasarım, tekstil sanatları vb. olmak üzere farklı alanları kapsayan kültür kavramı, toplumsal değerleri yaşatan ve geleceğe aktaran bir iletişim aracıdır. Çeşitli yöresel nitelikleri yansıtan zengin ve eşsiz özelliğe sahip geleneksel tekstil ürünleri (halı, kilim, işleme, oya vb.) kültür aktarımını sağlamaktadır. Güneydoğu Anadolu Bölgesi’nde yer alan Şanlıurfa ilinde geleneksel tekstil ürünlerine rastlamak mümkündür. Kültürel kimliği yansıtan, desen tasarım açısından özgün olan Şanlıurfa elbise örtüleri kumaşı ve üzerindeki yüzey bezeme teknikleri ile tekstil ürünleri arasında yer almaktadır. Çalışmada yöntem olarak tarama yöntemi kullanılmıştır. Araştırmanın evrenini Güneydoğu Anadolu Bölgesi Şanlıurfa ilindeki geleneksel tekstil ürünleri oluştururken, araştırmanın örneklemi ise Şanlıurfa yöresine ait 14 adet elbise örtüsüdür. Bu çalışmanın amacı Şanlıurfa elbise örtülerinin motif, kompozisyon, renk vb. olmak üzere tasarım özelliklerini incelemektir. Alan çalışması sonucunda Şanlıurfa yöresinde ulaşılabilen elbise örtü örneklerinin bitkisel, geometrik, figürlü, sembolik, nesneli, yazılı olmak üzere 6 farklı motif özelliğine sahip olduğu anlaşılmaktadır. Genellikle zemin rengi olarak beyaz renk, motiflerde ise genellikle canlı ve sıcak renkler tercih edilmektedir. Örtülerde kompozisyon olarak tam, ayna simetri ve birim raport kullanıldığı tespit edilmiştir.
An Overview on Predicting Protein Subchloroplast Localization by using Machine Learning Methods
Authors: Liu Meng-Lu , Su Wei , Guan Zheng-Xing , Zhang Dan , Chen Wei , Liu Li , Ding Hui
Published: January 2020

:

The chloroplast is a type of subcellular organelle of green plants and eukaryotic algae,
which plays an important role in the photosynthesis process. Since the function of a protein correlates
with its location, knowing its subchloroplast localization is helpful for elucidating its functions. However,
due to a large number of chloroplast proteins, it is costly and time-consuming to design biological
experiments to recognize subchloroplast localizations of these proteins. To address this problem, during
the past ten years, twelve computational prediction methods have been developed to predict protein
subchloroplast localization. This review summarizes the research progress in this area. We hope the
review could provide important guide for further computational study on protein subchloroplast localization.
Comprehensive Review and Comparison of Anticancer Peptides Identification Models
Authors: Song Xiao , Zhuang Yuanying , Lan Yihua , Lin Yinglai , Min Xiaoping
Published: January 2020

Anticancer peptides (ACPs) eliminate pathogenic bacteria and kill tumor cells, showing no
hemolysis and no damages to normal human cells. This unique ability explores the possibility of ACPs
as therapeutic delivery and its potential applications in clinical therapy. Identifying ACPs is one of the
most fundamental and central problems in new antitumor drug research. During the past decades, a
number of machine learning-based prediction tools have been developed to solve this important task.
However, the predictions produced by various tools are difficult to quantify and compare. Therefore, in
this article, a comprehensive review of existing machine learning methods for ACPs prediction and fair
comparison of the predictors is provided. To evaluate current prediction tools, a comparative study was
conducted and analyzed the existing ACPs predictor from the 10 public works of literature. The comparative
results obtained suggest that the Support Vector Machine-based model with features combination
provided significant improvement in the overall performance when compared to the other machine
learning method-based prediction models.
Progress in the Development of Antimicrobial Peptide Prediction Tools
Authors: Ao Chunyan , Zhang Yu , Li Dapeng , Zhao Yuming , Zou Quan
Published: January 2020

Antimicrobial peptides (AMPs) are natural polypeptides with antimicrobial activities and
are found in most organisms. AMPs are evolutionarily conservative components that belong to the
innate immune system and show potent activity against bacteria, fungi, viruses and in some cases display
antitumor activity. Thus, AMPs are major candidates in the development of new antibacterial
reagents. In the last few decades, AMPs have attracted significant attention from the research community.
During the early stages of the development of this research field, AMPs were experimentally
identified, which is an expensive and time-consuming procedure. Therefore, research and development
(R&D) of fast, highly efficient computational tools for predicting AMPs has enabled the rapid identification
and analysis of new AMPs from a wide range of organisms. Moreover, these computational
tools have allowed researchers to better understand the activities of AMPs, which has promoted R&D
of antibacterial drugs. In this review, we systematically summarize AMP prediction tools and their
corresponding algorithms used.
A Brief Overview of the Oral Delivery of Insulin as an Alternative to the Parenteral Delivery
Authors: Macedo Ana , Filipe Patrícia , Thomé Natália G. , Vieira João , Oliveira Carolina , Teodósio Catarina , Ferreira Raquel , Roque Luís , Fonte Pedro
Published: January 2020

:

Diabetes mellitus greatly affects the quality of life of patients and has a
worldwide prevalence. Insulin is the most commonly used drug to treat diabetic patients
and is usually administered through the subcutaneous route. However, this route of
administration is ineffective due to the low concentration of insulin at the site of action.
This route of administration causes discomfort to the patient and increases the risk of
infection due to skin barrier disturbance caused by the needle. The oral administration of
insulin has been proposed to surpass the disadvantages of subcutaneous
administration. In this review, we give an overview of the strategies to deliver insulin by
the oral route, from insulin conjugation to encapsulation into nanoparticles. These
strategies are still under development to attain efficacy and effectiveness that are
expected to be achieved in the near future.
MiR-340 Reduces the Accumulation of Amyloid-β Through Targeting BACE1 (β-site Amyloid Precursor Protein Cleaving Enzyme 1) in Alzheimer’s Disease
Authors: Tan Xianpei , Luo Yi , Pi Dingfang , Xia Liexin , Li Zhilian , Tu Qiang
Published: January 2020

Background:

Alzheimer’s disease (AD) is the most common neurodegenerative disease,
and the accumulation of amyloid-β is the initial process in AD. MicroRNAs (miRNAs) are
widely known as key regulators of the accumulation of amyloid-β in AD. This study analyzed the
potential effects and possible internal mechanisms of miR-340 on AD.

Methods:

The expression of miR-340 in senescence-accelerated mouse prone-8 (SAMP8) mouse
and senescence-accelerated mice/resistant-1 (SAMR1) mouse was evaluated by qRT-PCR (quantitative
real-time polymerase chain reaction). The expression of β-site amyloid precursor protein
cleaving enzyme 1 (BACE1) was determined by qRT-PCR and western blot. The binding ability
between miR-340 and BACE1 was verified by dual-luciferase reporter assay. In vitro cell model
of AD was established in human neuroblastoma SH-SY5Y cells transfected with Swedish mutant
form of amyloid precursor protein (APPswe). The effect of miR-340 on the accumulation of amyloid-
β was investigated by western blot analysis. Flow cytometry was conducted to detect cell
apoptosis.

Results:

MiR-340 was down-regulated in the hippocampus of AD model SAMP8 mouse compared
to SAMR1 mouse, while BACE1 was up-regulated in SAMP8, suggesting a negative correlation
between miR-340 and BACE1 in SAMP8 mouse. MiR-340 could directly bind with BACE1, and
over-expression of miR-340 decreased expression of BACE1 in SH-SY5Y/APPswe cells. MiR-
340 reduced the accumulation of amyloid-β and suppressed cell apoptosis through targeting
BACE1 in SH-SY5Y/APPswe cells.

Conclusion:

MiR-340 was downregulated in AD and reduced the accumulation of amyloid-β
through targeting BACE1, suggesting a potential therapeutic target for AD.
An Efficient Synthesis of Benzimidazole and Benzothiazole Derivatives Using a Nickel(II) Metal-Organic Framework
Authors: Janani Marzieh , Senejani Masumeh Abdoli , Isfahani Tahereh Momeni
Published: January 2020

Background:

The benzimidazoles and benzothiazoles have shown relatively high pharmaceutical
and biological activities. In recent years, numerous methods have been developed for synthesis of
benzimidazole and benzothiazole derivatives using different catalysts. However, only some of the reported
procedures are quite satisfactory and most of them have drawbacks. Herein, we report a convenient method for
synthesis of benzimidazole and benzothiazole derivatives using a nickel (II) metal-organic framework (Ni-
MOF) as a novel and reusable catalyst. The presence of unsaturated metal centers makes metal-organic
frameworks to be used as Lewis acid catalysts.

Objective:

The primary objective of this study was to describe an efficient method for synthesis of
benzimidazole and benzothiazole derivatives.

Methods:

Ni-MOF was prepared using the modified evaporation method and was characterized by FE-SEM,
FT-IR, TGA, and XRD techniques.The catalyst was then used to test the synthesis of some benzimidazole and
benzothiazole derivatives. The benzimidazoles and benzothiazoles were characterized by Elemental analyses,
HNMR and IR techniques.

Results:

A variety of aromatic aldehydes bearing electron donating groups or electron-withdrawing were
reacted with 1,2-phenylenediamine or 2-aminothiophenol using Ni-MOF in good to excellent yields.

Conclusion:

In summary, a new and highly efficient method was developed and reported for the synthesis of
benzimidazole and benzothiazole derivatives using nickel(II) metal-organic framework. The advantages are
short reaction times, good to excellent yields, the environmentally benign and simple procedure, stability, nontoxicity,
recyclability, and easy separation of the catalyst.
A Deep Convolutional Neural Network to Improve the Prediction of Protein Secondary Structure
Authors: Guo Lin , Jiang Qian , Jin Xin , Liu Lin , Zhou Wei , Yao Shaowen , Wu Min , Wang Yun
Published: January 2020

Background:

Protein secondary structure prediction (PSSP) is a fundamental task in
bioinformatics that is helpful for understanding the three-dimensional structure and biological
function of proteins. Many neural network-based prediction methods have been developed for
protein secondary structures. Deep learning and multiple features are two obvious means to improve
prediction accuracy.

Objective:

To promote the development of PSSP, a deep convolutional neural network-based
method is proposed to predict both the eight-state and three-state of protein secondary structure.

Methods:

In this model, sequence and evolutionary information of proteins are combined as multiple
input features after preprocessing. A deep convolutional neural network with no pooling layer and
connection layer is then constructed to predict the secondary structure of proteins. L2 regularization,
batch normalization, and dropout techniques are employed to avoid over-fitting and obtain better
prediction performance, and an improved cross-entropy is used as the loss function.

Results:

Our proposed model can obtain Q3 prediction results of 86.2%, 84.5%, 87.8%, and 84.7%,
respectively, on CullPDB, CB513, CASP10 and CASP11 datasets, with corresponding Q8
prediction results of 74.1%, 70.5%, 74.9%, and 71.3%.

Conclusion:

We have proposed the DCNN-SS deep convolutional-network-based PSSP method,
and experimental results show that DCNN-SS performs competitively with other methods.
Evaluation of Putative Toxin-antitoxins Systems in Clinical Brucella melitensis in Iran
Authors: Moradkasani Safoura , Kouhsari Ebrahim , Jazi Faramarz Masjedian , Kalani Behrooz Sadeghi , Pakzad Iraj
Published: January 2020

Background:

Toxin-antitoxin systems (TAs) are two-component elements, which are
extensive in the bacterial genome and have a regulatory role in many cellular activities including,
growth arrest, survival, biofilm formation, and bacterial persistence.

Objective:

TAs have not well studied in Brucella spp.

Methods:

We evaluated the presence of different toxin-antitoxin systems, including relE- rhhlike,
Fic- Phd, Cog- Rhh, and cogT- cogAT in 40 clinical Brucella melitensis isolates using PCRbased
sequencing assay.

Results:

Our results showed the high presence of relE-rhh-like, Fic-Phd, Cog-rhh, and cogTcogAT
s TAs genes in B. melitensis isolates that were 96.25%, 92.5%, 96.25%, and 95%, respectively.

Conclusion:

A high presence of TAs genes in clinical B. melitensis isolates revealed that the TA
system could be an antibacterial target in B. melitensis but more investigation is necessitated to
elucidate the exact roles of these genes.
Квантовые точки "ядро--оболочка" Ge/Si в матрице оксида алюминия: влияние температуры отжига на оптические свойства
Authors: Сресели О.М. , Берт Н.А. , Неведомский В.Н. , Лихачев А.И. , Яссиевич И.Н. , Ершов А.В. , Нежданов А.В. , Машин А.И. , Андреев Б.А. , Яблонский А.Н.
Published: January 2020

Structures with Ge/Si nanoparticles (quantum dots)
in an alumina matrix are interesting for researchers due to the
combination of two main semiconductors, as well as the use
of a matrix with high dielectric permittivity and strong oxygen
oxygen–metal bonding. Nanoperiodic multilayer structures in
the sequence substrate/Al2O3/Ge/Si/Al2O3 . . .Al2O3 (period —
Al2O3/Ge/Si, the number of periods was up to 20) annealed at
different temperatures were prepared in this work. It was shown
that nanocrystalline particles of both Ge and Si were observed
in the structures after annealing. Nanocrystal sizes and quantity
were determined by the thicknesses of deposited layers and the
annealing temperatures. The results obtained by various optical
techniques indicate a quantum-size effect in the structures, which
is confirmed by high-resolution microscopy.
Влияние температуры на характеристики 4H-SiC-фотоприемника
Authors: Калинина Е.В. , Виолина Г.Н. , Никитина И.П. , Иванова Е.В. , Забродский В.В. , Шварц М.З. , Левина С.А. , Николаев А.В.
Published: January 2020

Abstract The influence exerted by the carrier concentration in the range (1–50) × 10^14 cm^–3 in n -4 H -SiC chemical-vapor deposited (CVD) epitaxial layers on the spectral characteristics of UV photodetectors with Cr Schottky barriers in the range of 200–400 nm is revealed and explained in terms of the photoconductivity theory. Schottky barriers with a Cr film thickness of 20 nm and diameter of 8 mm are formed by thermal evaporation in vacuum through masks. A noticeable effect of the carrier concentration in the CVD epitaxial layers on the spectral characteristics of photodetectors upon heating to 200°C is also observed and accounted for by a difference between the generation-recombination processes. The irradiation of photodetectors with 15-MeV protons at a fluence of 4 × 10^12 cm^–2 and a temperature of 200°C leads to an increase in the quantum efficiency as compared to samples irradiated in similar modes at 25°C. This is indicative of an increase in the radiation hardness and service life of 4 H -SiC devices at elevated temperatures.
Влияние радиационных дефектов, созданных низкоэнергетическими протонами при температуре 83 K, на характеристики кремниевых фотоэлектрических структур
Authors: Богатов Н.М. , Григорьян Л.Р. , Коваленко А.И. , Коваленко М.С. , Колоколов Ф.А. , Лунин Л.С.
Published: January 2020

Irradiation with low-energy protons leads to a change in the electrophysical, optical, and other properties of the surface region of semiconductor structures, which creates additional possibilities for modifying semiconductor devices. The work is devoted to the study of the effect of radiation defects created by low-energy protons at a sample temperature of 83 K on the properties of two-sided silicon photovoltaic structures with a diffusion n^+-p junction. Samples of n^+-p-p^+ type were irradiated with a flux of protons with an energy of 40 keV or 180 keV and a dose of 1015 cm^-2. To explain the observed regularities in the variation of the parameters of the current-voltage characteristics and the transmission coefficients, the distribution of the average number of interstitial silicon, vacancies, divacancies, and disordering regions created under these conditions on the unit projective path length by one proton in the diffusion layer and the space charge region of the n^+-p junction was calculated. It is shown that protons with an initial energy of 40 keV predominantly change the physical properties of a layer with a high concentration of donors, and protons with an initial energy of 180 keV are properties of the space-charge region in a layer containing acceptors. The number of radiation defects in the maximum spatial distribution in the n-region is much smaller than in the p-region.
Энергоэффективные газовые сенсоры на основе нанокристаллического оксида индия
Authors: Форш Е.А. , Гусева Е.А.
Published: January 2020

The influence of grain size on the sensitivity of indium oxide with extremely small grains in range of 7–40 nm to nitrogen dioxide in low concentration at room temperature is investigated under the UV illumination. It is found that the sample with the intermediate size of nanocrystals shows the greatest response to nitrogen dioxide. The possibility of using nanocrystalline In2O3 to create a sensor for detecting NO2 in air at room temperature under UV illumination is demonstrated. It is shown that pulsed illumination may be used for NO2 detection at room temperature that significantly reduces the sensor power consumption.
Возможности характеризации кристаллических параметров структур Cd-=SUB=-x-=/SUB=-Hg-=SUB=-1-x-=/SUB=-Te на подложке из GaAs методом генерации на отражение второй гармоники зондирующего излучения
Authors: Ступак М.Ф. , Михайлов Н.Н. , Дворецкий С.А. , Якушев М.В. , Икусов Д.Г. , Макаров С.Н. , Елесин А.Г. , Верхогляд А.Г.
Published: January 2020

Abstract Comparative results of computational simulation and experiment are provided, concerning the azimuthal angle dependency of the registered signal second harmonic reflected from CdxHg1–xTe structures and GaAs substrates at the normal incidence of probing laser radiation and azimuthal rotation of its polarization plane. The study of (013) GaAs substrate and buffer layers of CdTe|ZnTe|GaAs has revealed that the deviations from the (013) surface orientation with regard to crystal physics angles ϴ and φ are ~1–3° for GaAs substrates and up to 8° for buffer layers of CdTe|ZnTe|GaAs, while the amplitude of the signal second harmonic reflected from buffer layers can well be considered as inversely related to the full width of X-ray rocking curves at half-maximum. Experimental data show that the values of non-linear susceptibility tensor components for CdxHg1–xTe crystalline structure significantly exceed those for CdTe and GaAs.
Синтез и магнитные свойства наночастиц Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/CoFe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- со структурой ядро/оболочка
Authors: Балаев Д.А. , Семенов С.В. , Дубровский А.А. , Красиков А.А. , Попков С.И. , Якушкин С.С. , Кириллов В.Л. , Мартьянов О.Н.
Published: January 2020

Fe3O4 / CoFe2O4 nanoparticles with a core-shell structure with an average size of 5 nm were obtained by co-precipitation from solutions of iron and cobalt chlorides. An analysis of the magnetic properties of the resulting system and their comparison with the data for single-phase Fe3O4 (4 nm) and CoFe2O4 (6 nm) nanoparticles led to the conclusion that there is a noticeable interaction between the soft magnetic (Fe3O4) and magnetically hard (CoFe2O4) phases that form the core and the shell of hybrid particles, correspondingly.
Дальний порядок в двумерных O(n)-моделях, индуцированный случайными полями, и состояние Имри-Ма
Authors: Берзин А.А. , Морозов А.И. , Сигов А.С.
Published: January 2020

A.A. Berzin, A.I. Morosov, and A.S. Sigov

The influence of defects of the “random local field” type with an anisotropic distribution of random fields on two-dimensional models with continuous symmetry of the vector order parameter is considered. In the case of weak anisotropy of random fields, with decreasing temperature there takes place a smooth transition from the paramagnetic phase with dynamic fluctuations of the order parameter to the Imry-Ma phase with static fluctuations caused by fluctuations of the random field of defects. In the case of strong anisotropy of random fields, defects lead to an effective decrease in the number of components of the order parameter and the appearance of a phase transition to an ordered state at finite temperature.
Свойства мемристивных структур на основе нанокомпозита (Co-=SUB=-40-=/SUB=-Fe-=SUB=-40-=/SUB=-B-=SUB=-20-=/SUB=-)-=SUB=-x-=/SUB=-(LiNbO-=SUB=-3-=/SUB=-)-=SUB=-100-x-=/SUB=-, синтезированных на SiO-=SUB=-2-=/SUB=-/Si-подложках
Authors: Николаев С.Н. , Емельянов А.В. , Чумаков Р.Г. , Рыльков В.В. , Ситников А.В. , Пресняков М.Ю. , Кукуева Е.В. , Демин В.А.
Published: January 2020

The structural features and I-V curves of a metal/nanocomposite/metal (M/NC/M) sandwiches based on NC (Co40Fe40B20)x(LiNbO3)100-x synthesized on SiO2/Si substrates are investigated. Samples M/NC/M were obtained by the method of ion beam sputtering of a composite target which allows to form NC of different composition in the range x = 5–48 at. %. Electron microscopic analysis showed that the matrix consists of metal granules in an amorphous nonstoichiometric matrix. The granules have a size of d~2–3 nm and have a shape close to spherical with a slight elongation along the growth direction. The local chemical composition of NC films was studied by X-ray photoelectron spectroscopy. The structures demonstrate the effect of resistive switching with the maximum value Roff / Ron≈10, observed at the metal content is x ~ 13 at. %. The number of write/erase cycles was more than 10^4. Observed effect of resistive switching is explain by the oxygen vacancies action on the tunnel conductivity of the contacts of granules percolation chains with one of structure electrode separated from the NC by a strongly oxidized layer.
Разработка технологии и исследование сверхвысокочастотных переключателей на основе 4H-SiC p-i-n-диодов
Authors: Лебедев А.А. , Кириллов А.В. , Романов Л.П. , Зубов А.В. , Стрельчук А.М.
Published: January 2020

Разработана технология СВЧ p-i-n-диодов на основе карбида кремния (SiC). С использованием данных диодов изготовлены переключатели для трехсантиметрового диапазона. Показано, что разработанные приборы по величине рабочей мощности примерно в 10 раз превышают рабочую мощность переключателей на базе Si-диодов при одинаковой толщине базы, равной 5 μm. Намечены пути дальнейшей оптимизации технологии данных приборов. Ключевые слова: карбид кремния, СВЧ диоды, модуляторы, переключатели, аттенюаторы.
Нелинейная динамика параметрических осцилляций экситон-поляритонов в полупроводниковом микрорезонаторе при учете затухания
Authors: Васильева О.Ф. , Зинган А.П. , Васильев В.В.
Published: January 2020

We studied the dynamics of polaritons in a microcavity in the parametric oscillator mode, when the pump is carried out by two laser pulses with close frequencies. Analytical solutions of a system of nonlinear differential equations are found for equal damping constants
Влияние микропримесей d-элементов на электронную структуру кристаллитов оксида бария в катодах СВЧ-приборов
Authors: Капустин В.И. , Ли И.П. , Шуманов А.В. , Москаленко С.О. , Залялиев Р.Р. , Кожевникова Н.Е.
Published: January 2020

Using the electron spectroscopy method for chemical analysis, it was experimentally established for the first time that microimpurities of d elements (W, Re, Ni, Pd, Os) in BaO crystallites from the composition of cathodes of microwave devices lead to the formation of donor-type surface states on the crystallite surface, which can partially compensate acceptor-type surface states due to surface oxygen vacancies, which leads to a decrease in the potential barrier on the crystallite surface and, accordingly, to a decrease the magnitude of the work function of the cathode. Key words: cathodes of microwave devices, crystallites of barium oxide, trace elements of d-elements, surface states of donor and acceptor type.
Влияние поверхностного натяжения на разрушение макрообъема жидкости при его свободном падении
Authors: Архипов В.А. , Басалаев С.А. , Золоторёв Н.Н. , Перфильева К.Г. , Усанина А.С.
Published: January 2020

The technique and results of an experimental study of the effect of the surface tension coefficient and the initial volume of a water core on the dynamics of its destruction at free settling in air with a non-zero initial velocity are presented. It is shown that the distance over which the water core completely collapses with the formation of the cloud of droplets decreases by 30% at two-fold decrease in the surface tension coefficient of a liquid. It is shown that the dependence of distance of complete destruction on the initial core volume has a minimum.
Исследование динамических пороговых характеристик VO-=SUB=-2-=/SUB=--переключателя в осцилляторном контуре
Authors: Беляев М.А. , Величко А.А.
Published: January 2020

This paper investigates the dependence of the dynamic threshold characteristics of a VO2-switch on the oscillation frequency of a self-oscillating circuit. A transitional oscillation regime related to the self-heating of the substrate is discovered. Proposed analytical formulas allow consider these regularities and having practical significance in designing oscillator neural networks based on VO2-switches.
AlInSb/InSb-гетероструктуры для ИК-фотоприемников, выращенные методом молекулярно-лучевой эпитаксии
Authors: Суханов М.А. , Бакаров А.К. , Протасов Д.Ю. , Журавлёв К.С.
Published: January 2020

A photodetector heterostructure based on AlInSb / InSb grown by molecular beam epitaxy was presented. Mesastructures of various diameters were fabricated and the temperature dependence of the dark current was measured. It was shown that the built-in barrier blocks the flow of the main charge carriers, thereby reducing the dark current density, in comparison with the pin structure based on InSb. By measuring the dependence of the dark current on the size of the mesastructure, it was shown that the bulk component of the current prevails over the surface component.
Маска на основе эпитаксиального слоя Si для самокаталитического роста нитевидных нанокристаллов на подложках GaAs (111)B и (100)
Authors: Емельянов Е.А. , Настовьяк А.Г. , Петрушков М.О. , Есин М.Ю. , Гаврилова Т.А. , Путято М.А. , Шварц Н.Л. , Швец В.А. , Васев А.В. , Семягин Б.Р. , Преображенский В.В.
Published: January 2020

GaAs nanowire (NW) self-catalyzed growth on GaAs (111) B and GaAs (100) substrates was carried out by molecular beam epitaxy. A mask for the self-catalyzed NW growth was created by oxidizing an epitaxial silicon layer grown on the GaAs surface by molecular beam epitaxy (MBE). Silicon oxidation was realized in an atmosphere of purified air under normal conditions without moving the structures out from the vacuum system volume of the molecular beam epitaxy chamber. The oxidation process of a silicon layer was studied using single-wave and spectral ellipsometry and the surface morphology of oxidized silicon was studied by atomic force microscopy. Substrates with NWs were studied by scanning electron microscopy. The NW density was demonstrated to be 2.6•107 cm-2 and 3•107 cm-2 for (111)B and (100), respectively.
Резонансная перезарядка в электростатическом поле
Authors: Девдариани А.З. , Артамонова А.О. , Беляев А.К.
Published: January 2020

The estimation of the electrostatic field influence that exits, e.g., in plasma, on resonant charge exchange under collision velocities substantially less than that of an active electron is made in the frame of the zero range potential model. It is determined that the electric field of sufficient value leads to decreasing the charge exchange cross section. For example, the field about 10^7V/cm decreases the cross section on an order of magnitude.
Параметрическое усиление магнитоакустических колебаний в структуре ферромагнетик-пьезоэлектрик
Authors: Бурдин Д.А. , Чашин Д.В. , Экономов Н.А. , Фетисов Ю.К.
Published: January 2020

Parametric amplification of magnetoacoustic oscillations was observed in a disk resonator containing a ferromagnetic layer of FeBSiC and a piezoelectric layer of lead zirconate-titanate. Oscillations with a frequency of 3.08 kHz were excited and recorded using two coils with orthogonal axes. Pumping was performed by an electric field with a double frequency applied to the piezoelectric layer. The amplification of vibrations arises due to a change in the rigidity of the structure under influence of an electric field. It is shown that the gain can be changed using a permanent bias magnetic field applied to the structure.
An Electronic Health Platform for Monitoring Health Conditions of Patients With Hypertension in the Brazilian Public Health System: Protocol for a Nonrandomized Controlled Trial
Authors: De Marchi Ana Carolina Bertoletti , Alves Ana Luisa Sant' Anna , Gonçalves Carla Beatrice Crivellaro , Cervi Cristiano Roberto , Biduski Daiana , Bellei Ericles Andrei , Madalozzo Guilherme Afonso , Da Cruz Ivana Beatrice Mânica , Veiga Jeangrei Emanoelli , Rodriguez João Pedro Mazuco , Ferretto Luciano Rodrigo , Bin Luiz Carlos Pereira , Rebonatto Marcelo Trindade , Portella Marilene Rodrigues , Roman Mateus Klein , Cechetti Nathália Pinto , Rieder Rafael , Debon Raquel , Volpi Simiane Salete
Published: January 2020

Background

Chronic noncommunicable diseases such as arterial hypertension have a high impact in the context of public health. Previous studies have shown improvements in blood pressure due to simple lifestyle changes, which were supported by electronic health (eHealth) solutions.

Objective

The aim of this study is to develop an eHealth platform and assess the effects of its use on the health conditions of patients with hypertension, with assistance from health professionals in the public health system of a Brazilian city.

Methods

The platform will include a server that centralizes all the data and business rules, a website dashboard for health professionals, and a mobile app for patients. We will analyze the effects of its use through a controlled, nonrandomized, nonblind, prospective, monocentric clinical trial. We will enroll 68 participants diagnosed with arterial hypertension and under medical follow-up and categorize them into two groups. The participants of the intervention group will use the platform as a monitoring method, whereas the participants of the control group will use conventional methods. In both groups, we will assess and compare the evolution of blood pressure and treatment adherence before, during, and after the intervention.

Results

The project was funded at the end of 2018. We have been developing the software since 2019 with plans to complete it in 2020, and we will enroll patients between 2020 and 2021. We expect to submit the first results for publication in 2020.

Conclusions

For the primary outcome, we expect a reduction and stabilization of blood pressure. For the secondary outcomes, we hope to see improvements in treatment adherence, physical activities and dietary practices, and acceptance of the eHealth platform. In public health, the technology that favors disease control also helps reduce complications and, consequently, treatment costs. The platform might encourage the adaptation of medical assistance to incorporate this technology into patient monitoring.

International Registered Report Identifier (IRRID)

PRR1-10.2196/15299
Optimasi Tablet Lepas Cepat Levofloksasin Hidroklorida Menggunakan Crospovidone Sebagai Disintegran dan Studi Disolusi Efisiensi
Authors: Pratiwi Puspa Dwi , Nugroho Akhmad Kharis , Lukitaningsih Endang
Published: January 2020

Tablet mengandung zat aktif dan eksipien yang berfungsi untuk meningkatkan sifat fisik tablet sehingga perlunya optimasi dan pengaruhnya terhadap sifat fisik tablet. Crospovidone merupakan salah satu disintegran yang diklaim dapat meningkatkan waktu hancur dan disolusi obat. Tujuan dari penelitian ini adalah melakukan optimasi tablet dan menentukan efek dari perbedaan jumlah crospovidone terhadap respon untuk mendapatkan formula optimal. Optimasi tablet dilakukan metode simplex lattice design dari perangkat lunak Design Expert versi 11 menggunakan dua variabel independen, yaitu crospovidone 2-10% dan laktosa monohidrat (45-53%). Preparasi tablet dilakukan menggunakan metode granulasi basah. Semua formula dilakukan uji sifat alir serbuk, kekerasan tablet, kerapuhan tablet, waktu hancur tablet, penentuan kadar levofloksasin dalam tablet, dan DE60. Formula optimal didapatkan dari respon kekerasan tablet, kerapuhan tablet, waktu hancur tablet, dan DE60. Formula optimal yang didapatkan adalah formula dengan jumlah crosspovidone 10% ditandai dengan nilai desirability 0,546 menghasilkan sifat fisik tablet berupa rata-rata kekerasan 4,33 kg, kerapuhan 0,49%, waktu hancur 6,36 menit, dan rata rata DE60 sebesar 75,00%. Terdapat perbedaan signifikan adanya perbedaan jumlah crospovidone terhadap waktu hancur. Tidak terdapat perbedaan signifikan antara respon prediksi yang diberikan perangkat lunak Design Expert versi 11 dengan hasil observasi sehingga simplex lattice design dari perangkat lunak Design Expert versi 11  mampu memprediksi respon secara akurat.
Assessment of the Current Pollution Status of Jabi Lake in the Federal Capital Territory, Abuja, Nigeria
Authors: Ezeamaka Cyril Kanayochukwu , Queen Sadiq , Mwanret Daful , Moses Ogbole , Wado Anjide Theresa
Published: January 2020

This paper was aimed at providing the pollution status of Jabi Lake, FCT Abuja. 13 parameters were tested from raw water collected four sampling points. The physicochemical parameters were measured using Hanna multiparametric meter, while transparency was measured using Secchi disc. Dissolved oxygen, Biological and Chemical oxygen demand were measured titrimetrically using standard method. The concentrations of the metals were determined in triplicates. Flame atomic absorption spectrometer was used in the analysis as well as descriptive statistics (mean, standard deviation) and standard error. The Nigerian Industrial Standard and WHO guidelines for domestic water were used to compare the results of the water from the lake. The study reveals that the mean turbidity ranged between 21.6 – 24.2cm and is above the recommended limits of both WHO and NIS. The range of pH was between 6.3 and 8.8. pH is within a neutral range. The study reveals that the mean value of TDS and electrical conductivity is below the recommended limit of both WHO and NIS guidelines. The study shows that there is high concentration of some heavy metals (Cd, Cu, Ni, Mn, Zn, and Fe) in Jabi Lake. Cd, Zn, Fe and Ni are above the permissible limits of the NIS and WHO guidelines, which is an indication of pollution. The study, therefore, recommends that proactive measures be taken on environmental laws in FCT and that environmental/health worker and non-governmental bodies be active in enlightenment campaigns that will alert members of the public to the harm being caused to this important ecosystem.
Education among Scheduled Caste Population in India
Authors: Sahoo Harihar , Acharya Sumana
Published: January 2020

Lack of education among the scheduled castes (SC) population in India may be the main reason for remaining at the lower end of the social structure. Therefore, this study attempts to explore the changing trends in literacy among the SC to find out the determinants of higher education and to explore the major reasons for never enrolling or discontinuing/dropping out from educational institutions among the SC population in India. Using the data from the Census of India and also from National Sample Survey and employing both bivariate and multivariate analysis, the results reveal that though there is an increasing trend in the literacy rate among the SC population, but the rates remain quite below the national average. Gender disparity in literacy is quite evident. The low level of higher education mainly due to reasons like failing in examinations, heavy drop-outs and stagnation caused by their poor socio-economic background. Despite various efforts by the central and state governments to eradicate differences in educational attainment among the social groups through several constitutional steps from time to time there still remain gaps to be bridged.
Characterization of municipalities with high road traffic fatality rates using macro level data and the CART algorithm
Authors: De Campos Cintia Isabel , Dos Santos Murilo Castanho , Pitombo Cira Souza
Published: January 2020

Road traffic accidents occur daily caused by different factors leading to varying degrees of injury severity. Considering this, many studies have been developed to identify and understand these factors to implement preventive actions. A Decision Tree (DT) is one of the techniques that can generate classifications and predictions by detecting a priori unknown patterns. This study aims to identify the characteristics of municipalities with high and very high fatality rates caused by traffic accidents, using a macro level dataset and a DT algorithm (CART - Classification And Regression Tree). Therefore, macro level data from the municipalities of São Paulo state (Brazil) were used, such as demographic and socioeconomic data, fatality rates and other variables related to traffic. The results indicated the Gross Domestic Product (GDP) as the most important variable, and the municipalities were characterized mainly considering the size of the highway network and vehicle fleet (trucks, minibuses, cars, motorcycles). These characteristics could provide support to the government to plan mitigating actions in municipalities with the highest tendency to high traffic fatality rates.
Design and implementation of an alternative measurement system for MOSFET-Like sensors characterization
Authors: Zorrilla Luighi Viton , Lezama Jinmi , Acosta Rubén
Published: January 2020

This paper describes the design and implementation of an alternative system to measure electrical parameters (voltage and current) in order to characterize MOSFET-Like sensors. To design a signal conditioning circuit is necessary to understand the sensor behavior, therefore knowing its characteristics is essential. As sensor manufacturers do not usually provide the whole technical information about them, a measurement system is proposed to obtain those sensor characteristics with the aim of modeling the sensor device. This system is based on a MCU which generates voltages and measures currents via an external transimpedance amplifier, and it is supported by a software platform developed upon python based open source tools. Such combination offers a low cost system to stimulate and capture sensor responses which could be processed later to extract the characteristic parameters. The system was tested principally with an Ion Sensitive Field Effect Transistor (ISFET) and results show the VDS-IDS and VGS curves obtained with it.
Optimization of friction stud welding process parameters by integrated Grey-Fuzzy logic approach
Authors: Hynes N. Rajesh Jesudoss , Kumar R. , Velu P. Shenbaga , Sujana J. Angela Jennifa
Published: January 2020

In this work, an integrated grey fuzzy logic technique is employed for solving the multi objective function of friction stud welding machine process parameters. This technique converts the multi-objectives into a grey fuzzy reasoning grade. According to the grey fuzzy reasoning grade, an optimal combination of process parameters is concluded. Here, Taguchi L9 orthogonal array is used to design the experiments. The objective of this work is to maximize impact strength and minimize metal loss during the joining of AA 6063 and AISI 1030 steel. Rotational speed, friction time, and friction pressure are considered as the input process parameters. The outcomes of the confirmation test show that good joining strength is accomplished by the optimal level of process parameters.