bluuebunny/crossref_metadata_2025 huggingface dataset:
Produksi dan Pemurnian Xilooligosakarida dari Xilan Tongkol Jagung menggunakan Xilanase Streptomyces P26B4 dan Khamir IP4
Authors: Susantri Andika , Sunarti Titi Candra , Meryandini Anja
Published: April 2021

Xylooligosaccharides (XOS) are sugar oligomers from xylan that can be used as prebiotics to improve digestive tract health. Xylan can be extracted from corncobs which are a by-product of agriculture. The purpose of this study was to produce XOS through hydrolysis of corn cobs xylan using Streptomyces P26B4 xylanase. The products of hydrolysis also consisted of monomer xylose; for that xilooligosaccharides were purified using yeast IP4. The xylan hydrolysis products are quantitatively analyzed based on the value of reducing sugars and degree of polymerization (DP), strengthened qualitatively with TLC. Sugar component was analyzed after the addition of yeast by HPLC. P26B4 xylanase isolates had the highest activity on the 7th day incubation, pH 5,5 buffer citrate and temperature of 50°C. The lowest DP value of xylan hydrolysis was 2.49 at a concentration of 6%, and the 24th hour of incubation. TLC chromatograms showed that xylose and XOS products were produced. Purification of XOS at 6%, showed a decreasing in the area of xylose before and after receiving yeast respectively 1.87% and 1.41%.Therefore, yeast IP4 has the potential to consume xylose amnd purify the XOS. 

Keywords: corncobs xylan, IP4 yeast, purification, Streptomyces P26B4 xylanase, xylooligosaccharides
Effect of Microneedling Associated With Drug Delivery on Facial Rejuvenation: Clinical and Histological Evaluation
Authors: Maia Rafaella , Silva Rodrigo , Farias Stephany , Vasconcellos Liliane , Carreiro Eneida , Meyer Patrícia , Borges Fábio , Afonso Felipe , Oliveira Fernando César , Soares Ciro , Rodrigues Joyce
Published: April 2021

Introduction: Microneedling has been used to treat different human connective tissue disorders, promoting an increase in the permeation of active ingredients, to favour local vascularization and collagen production. Objective: To investigate the effects of microneedling associated with the permeation of cosmetological actives (drug delivery) on facial rejuvenation. Method: This was a controlled clinical trial, in which 30 volunteers with facial aging were recruited and distributed into 2 groups. G1 was treated with microneedling with associated saline and G2 received microneedling with associated drug delivery (with growth factors) in the entire facial region (full face). Both groups received two treatment sessions with an interval of 30 days between them. For result evaluation, photos were clinically analysed before and after the interventions, the facial symmetry was verified through the measurement of angles and measurement of the facial region, and a histological analysis of the eyelid region of two patients who underwent surgery blepharoplasty was carried out. Results: Both groups presented satisfactory clinical results in the photographs’ visual analysis. In the evaluation of facial symmetry, G2 showed an improvement in the measurements of the paralateronasal L-projection, nasolabial F-crease, right and left lateral palpebral crease, with p<0.01. In the histological analysis, G2 showed higher collagen and elastin increase than G1, with greater predominance of better-quality collagen (type I) when drug delivery was performed. Conclusion: The association of microneedling with growth factors promotes a greater production of collagen fibres and connective tissue reorganization, compared to microneedling with no cosmetological assets.
Identity of Homo Sovieticus in Retrospective and Modernity:value and Anthropological Objectivations of Phenomenological and Literary Senses
Authors: Mudrakov Vitalii , Polishchuk Oleksandr , Popovych Mykola , Mozolev Oleksandr
Published: April 2021

The article deals with the study of Soviet identity, which the authors refer to as Homo sovieticus. The research is developed in the spatio-temporal explications of the successor states of the Soviet mentality and former satellites of the Soviet system, presented by ideological and semantic intentions from different periods of the Soviet Union’s existence to the present day. Therefore, the topicality of the research is due to cultural and civilizational transformations caused by changes in identification processes in Eastern Europe, as well as socio-political threats generated by them. The peculiarity of the article is its methodological basis: the principles of phenomenology and hermeneutics. The specificity of the use of philosophical hermeneutics was the need to reveal and interpret hidden or sharpened (overly expressive) meanings-expressions of texts, because the authors in their original theses set the task to rely solely on texts of artistic content and journalistic nature. The authorship of texts of these types determines the peculiarity of the phenomenological approach: own experience of a number of problems related to the identity of Homo sovieticus. Important in this context is the topic of time: the combination of retrospective view with modern experiences to meet the future. Based on these guidelines, the authors propose the concept of utterance to denote these literary and journalistic experiences in the broadest sense. The objective of the article is to determine the general image of Homo sovieticus in terms of retrospection and modernity. The peculiarity of this definition are the sources: (1) artistic and journalistic works of those authors who managed to escape from this method of self-identification (emigrant refugees); or (2) victims of violence with such an identity (“court poets”); respectively (3) those who in every way fixes in the past or continue to do so today, thus resisting this value orientation in the outlined region (modern intellectuals-writers). The authors of the article define such tasks as (1) the description of the contexts of the existence of the Soviet man as determining factors of the formation of Homo sovieticus identity; (2) formulation of the main constant features of Homo sovieticus; (3) modern receptions regarding the value matrix of Homo sovieticus in the dynamics of current challenges. The authors conclude that the entire post-Soviet space is experiencing contextual metamorphoses regarding the restoration renewal of the Homo sovieticus identity type to varying degrees. The means of identifying these processes is a clear articulation of the constant features of this type in the comparative context with modern events of cultural and political nature. Finally, the authors argue that the best way to objectify these processes is artistic and scientific-journalistic literature.
Environmental Sustainability and Libraries: What do the Students Think?
Authors: Radaković Jelena Andreja , Petrović Nataša , Kručičan Aleksandra , Ćirović Marko , Tomić Andrija
Published: April 2021

Nowadays, great attention is paid to the role of libraries in sustainability. Their role is especially given in promoting not only sustainable development goals (SDGs) but their achievements, too. The reason for this is in their part in necessary promotion of literacy and offering free access to information about environment, environmental protection, sustainability, and SDGs. This is easily understandable bearing in mind that libraries must have their task in providing indispensably knowledge for current and future generation about these crucial issues for survival of mankind. In addition, it is generally known that current and future generation represent the foundation of sustainable development and all of the SDGs. On the other hand, higher education is a crucial mean for creating globally competent students for a more sustainable future. Bearing this in mind, we have conducted a survey on the students’ opinion about the role of libraries in providing environmental sustainability and SDGs goals knowledge. Results of the survey were analyzed using SPSS 24 software for statistical analysis and they are presented in final parts of this paper.
ТЕПЛООБМЕННОЕ УСТРОЙСТВО ДЛЯ ПОГРУЖНЫХ ЭЛЕКТРОДВИГАТЕЛЕЙ УСТАНОВОК ЭЛЕКТРОЦЕНТРОБЕЖНЫХ НАСОСОВ
Authors: Вахитова Роза Ильгизовна , Уразаков Камил Рахматуллович , Думлер Елена Борисовна
Published: April 2021

Актуальность разработки технического устройства обусловлена необходимостью решения задач, связанных с охлаждением высокооборотных вентильных и асинхронных погружных двигателей, в том числе при выводе добывающих скважин на рабочий режим. Особенно актуальна разработка эффективных систем охлаждения таких двигателей при использовании высокооборотных двигателей в малодебитных скважинах, поскольку мощность источников теплоты резко увеличивается по квадратичному закону в зависимости от числа оборотов. Основная цель: разработать конструкцию теплообменного устройства, позволяющего интенсифицировать теплообменные процессы в погружном электродвигателе для увеличения его межремонтного периода работы. Объектом исследования является модуль-теплообменник, применяемый в серийно выпускаемых электропогружных центробежных насосных установках с асинхронными погружными маслозаполненными двигателями и в высокоборотных погружных установках с вентильными электродвигателями. Модуль-теплообменник предназначен для снижения тепловой напряженности, повышения его эффективности при работе в условиях воздействия высоких температур. Методы. Для решения поставленной задачи был использован метод проектных исследований путем модернизации существующей конструкции модуля-теплообменника с низкой эффективностью теплообмена между пластовой жидкостью и нагретым маслом в электродвигателе с небольшими перепадами температур между ними. Результаты. Предложена усовершенствованная конструкция модуля-теплообменника, которая в условиях малых внутренних габаритов скважины и относительно невысоких температурных градиентов между нагретым маслом погружного электродвигателя и омывающей его пластовой жидкостью позволяет обеспечить максимальную степень интенсификации теплообменных процессов. Для эффективного охлаждения маслосистемы электродвигателя предложено использовать двухконтурную систему охлаждения. Для увеличения общей площади поверхности активного теплообмена выполнено оребрение внутреннего канала сквозного протока пластовой жидкости. Для обеспечения активной циркуляции нагретого масла предложено на поверхности внутренних стенок маслоканалов установить элементы закрутки потока, позволяющие выровнять температурные показатели пластовой жидкости и масла.
ГИДРОГЕОЛОГИЧЕСКИЕ И ГИДРОЛОГИЧЕСКИЕ УСЛОВИЯ ФУНКЦИОНИРОВАНИЯ ОБСКОГО И БАКСИНСКОГО БОЛОТ (ЮГО-ВОСТОК ЗАПАДНО-СИБИРСКОЙ РАВНИНЫ)
Authors: Савичев Олег Геннадьевич , Хэнь Ян
Published: April 2021

Актуальность определяется важной комплексной ролью болот в формировании экологического состояния регионов Западной Сибири, включая вопросы взаимодействия подземных, речных и болотных вод. Цель: исследование гидрогеологических и гидрологических условий функционирования низинных Обского и Баксинского болот на юго-востоке Западно-Сибирской равнины. Основные задачи: 1) оценка элементов водного баланса болот; 2) оценка и анализ взаимодействия болотных, речных и подземных вод. Методы: статистический анализ, математическое моделирование гидрогеологических и гидрологических процессов. Результаты и выводы. Выполнена количественная оценка элементов водного баланса Баксинского и Обского болот и их водосборов за 1966–2019 гг. (юго-восточная часть Западно-Сибирской равнины на участках сочленения с палеозойским обрамлением). Определено внутригодовое распределение инфильтрационного питания палеоген-четвертичных отложений в междуречье рек Обь и Шегарка. Показано, что при заболачивании с преимущественным распространением низинных болот происходит уменьшение испарения с поверхности и увеличение слоя водного стока. Это приводит к дополнительному заболачиванию территории. Установлено, что взаимодействие поверхностных и подземных вод с разной степенью интенсивности в основном ограничено глубинами 110–120 м. Влияние болотных вод на подземные воды наиболее вероятно в летне-осенний период. В это время возможен переток болотных вод в подземные горизонты на участках 800–900 м, а также увеличивается инфильтрационное питание. Влияние болотных вод достигает максимумов на спаде высоких половодий, когда происходит сброс водных масс с заболоченной поймы в речное русло.
ПАРАМЕТРЫ МАКРОСТРУКТУРЫ НЕРАСТВОРИМЫХ ПРОДУКТОВ ТЕРМОЛИЗА СМОЛ И АСФАЛЬТЕНОВ УСИНСКОЙ НЕФТИ
Authors: Антипенко Владимир Родионович , Гринько Андрей Алексеевич
Published: April 2021

Актуальность исследования обусловлена тем, что процессы переработки нефтяных остатков, тяжелых нефтей и природных битумов, основанные на термической деструкции высокомолекулярных компонентов сырья, приводят не только к новообразованию дистиллятных фракций. Они всегда сопровождаются образованием нерастворимых в нефтяной среде продуктов карбонизации, обычно называемых коксом. Основными источниками для образования кокса являются смолы и асфальтены исходного сырья. Термическая деструкция смол и асфальтенов широко используются для изучения их молекулярного строения. Информация о составе и свойствах нерастворимых продуктов, полученных при термическом воздействии на смолисто-асфальтеновые вещества, позволит получить информацию о путях их образования. Особенности макроструктуры нерастворимых коксообразных продуктов, полученных в процессе термолиза смол и асфальтенов усинской нефти при различных температурах, не были установлены. Цель: установление параметров макроструктуры нерастворимых продуктов, полученных при разных температурах автоклавного термолиза смол и асфальтенов усинской нефти в инертной атмосфере. Объекты: нерастворимые в хлороформе продукты автоклавного термолиза в атмосфере аргона при 250, 450 и 650 °С смол и асфальтенов тяжелой, высокосернистой, высокосмолистой нефти Усинского месторождения. Методы: спектроскопия комбинационного рассеяния, рентгенодифракционный фазовый анализ. Результаты. С использованием спектроскопии комбинационного рассеяния и рентгенодифракционного фазового анализа охарактеризованы нерастворимые продукты автоклавного термолиза при 250, 450 и 650 °С смол и асфальтенов усинской нефти. Установлено, что продукты, полученные при температурах 450 и 650 °С, по своим характеристикам соответствуют продуктам сравнительно высокой степени карбонизации. Их спектры комбинационного рассеяния содержат полосы в области 1350 и 1580 см–1 (D- и G-полоса) и их обертоны в области 2700 и 3400 см–1, характерные для углеродных материалов с невысокой степенью упорядоченности. Параметры их макроструктуры, определенные методом рентгенофазового анализа, особенности дифрактограмм также соответствуют карбено-карбоидам и коксу. В то же время нерастворимые продукты, полученные из смол при 250 °С, проявляют флуоресценцию в условиях регистрации КР-спектра, очень близки к исходным асфальтенам по параметрам макроструктуры, рассчитанным из результатов рентгенофазового анализа. Это дает основание отнести их к асфальтеноподобным веществам, что подтверждает выводы, сформулированные нами ранее на основе их элементного состава, ИК-спектров, результатов пиролитического анализа в режиме Rock Eval и «on line» флэш-пиролиза.
МЕТОДИЧЕСКОЕ И АЛГОРИТМИЧЕСКОЕ ОБЕСПЕЧЕНИЕ АВТОМАТИЗИРОВАННОЙ ЭКСПЕРИМЕНТАЛЬНОЙ УСТАНОВКИ УДАЛЕНИЯ ГИДРАТОВ В ГАЗОКОНДЕНСАТНОЙ СМЕСИ В ТРУБОПРОВОДЕ
Authors: Волков Павел Валерьевич , Большунов Артем Владимирович , Мостокалов Кирилл Алексеевич
Published: April 2021

Актуальность исследования обусловлена тем, что в настоящее время в мировой нефтегазовой промышленности проблема образования гидратов стоит достаточно остро. Аккумулирование гидратов на участке трубопровода или в определенных узлах установок подготовки углеводородов может привести к срыву технологического процесса, выходу из строя оборудования, снижению качества готовой продукции для потребителя. Главная задача состоит в том, чтобы своевременно определять наличие гидратов в полости трубопровода или правильно прогнозировать процесс его формирования и аккумулирования. Существует множество методов борьбы с гидратообразованием, но они могут быть высокозатратны, малоэффективны или иметь высокий класс опасности. В статье рассмотрен новый способ борьбы с гидратообразованием и предложена методика по автоматизации процесса. Аппаратная часть рассматривается как имитационный экспериментальный стенд для проведения экспериментов, проверки аналитических расчетов и автоматизации. Программная часть представляет методику автоматизации определения зон возможного гидратообразования, что позволяет проводить более качественную оценку, и программу для автоматизированной работы опытно-промышленного образца в реальных условиях. Описаны алгоритмы работы, алгоритмы аварийной и нормальной остановки. Для более точного и быстрого анализа проблемных зон гидратообразования, а также безаварийной работы установки разработан строгий алгоритм. В систему команд алгоритма заложены все аварийные ситуации, возможные ошибки, предельные режимы работы. Работа всех алгоритмов была проверена практическим путем посредством имитации процесса реальной работы системы и подачи условных сигналов на вход в программный модуль установки. Цель: применение и анализ работы алгоритмического обеспечения для работы экспериментальной установки по удалению гидратов из потока газоконденсатной смеси. Объект: автономная модульная установка для борьбы с гидратообазованием. Методы: теоретические методы для обоснования закономерности течения процессов тепломассообмена, расчетно-аналитический метод для определения качества работы разработанного программного обеспечения, практические методы по проведению экспериментов. Результаты. Построен лабораторный стенд на базе Национального исследовательского Томского политехнического университета, проведены эксперименты для различных потоков газа с разными термобарическими условиями, разработано математическое и алгоритмическое обеспечение для автоматизации процесса работы установки, проведена проверка работы системы.
Prospects for the development of accelerated container transportation in Uzbekistan
Authors:   Tashkent State Transport University (TSTU), Rasulov Marufdjan X. , Ismatullaev Azizbek F. ,   Tashkent State Transport University (TSTU)
Published: April 2021

The article considers and analyzes the volume of container cargo transportation in the Republic of Uzbekistan. Trends in the development of container transportation by rail are studied. The research methodology is based on the analysis of the methods of collecting the initial information, as well as the methods of its processing. The main measures for the development and implementation of technical, technological, commercial and organizational measures to increase containerization of cargo transportation are proposed.
Features of the development of a professional singing sound of pop-jazz performers in the process of teaching performance skills
Authors: Arzamastseva Olesya V. , Tyurina Larisa A.
Published: April 2021

The urgency of vocational training for pop-jazz musicians is substantiated. The aim of the study is to determine the necessary components in the work on professional sound production in the process of teaching pop-jazz vocal, as well as to demonstrate some ways to increase the effi-ciency of work on sound in the classroom. The issues of the development of a professional singing voice in the process of teaching pop-jazz performance are considered. The research methods in-cluded: study of special literature, analysis and generalization of research and pedagogical expe-rience of the work of leading specialists in the field of music education and performance. The high degree of influence of the level of professional training of performers-vocalists on the national musical culture is proved. Practical recommendations for work on singing sound production in the process of professional training of pop-jazz singers in modern music educational institutions are presented.
Psychological features of the collocational competence development
Authors: Klochikhin Vitaliy V.
Published: April 2021

In connection with the use of the communicative method in foreign language teaching, the collocational competence development becomes especially relevant. Based on the analysis of the researchers’ works on the topic, it is revealed that one of the problems of the collocational competence development is not following the principle of the learning consciousness. The essence of this principle is that the provision of all theoretical information should precede the practice of a foreign language. Perception is highlighted as the initial level of consciousness. It is noted that the perception of the language material by the native speaker and the learner is different. Weak con-nections between the elements of the learner’s mental vocabulary explain why learners “mix” col-locations. Noticing is the next level of consciousness. The analysis of scientific literature has shown that noticing is an important component of the successful study of a foreign language. The conditions that affect operations upon noticing are highlighted. Understanding is the last level of consciousness. The next logical step in the collocational competence development, following the principle of learning consciousness, is the use of communicative and pseudocommunicative tasks to consolidate the conscious theoretical material.
Prefigurações da tecnocracia estatal (considerações sobre o pensamento autoritário brasileiro)
Authors: Silva Ricardo
Published: April 2021

Este artigo tem como objetivo discutir alguns aspectos centrais na caracterização da ideologia do autoritarismo estatal no Brasil, tal qual esta ideologia se expressa no pensamento político de Oliveira Viana, Azevedo Amaral e Francisco Campos, intelectuais de destaque nos anos 30 e associados, cada um a seu modo, ao projeto institucional do Estado Novo (1937-1945).
World Crisis and Market of Infrastructural Projects
Authors: Varnavskii V.
Published: April 2021

World financial and economic crisis had a serious impact on the production infrastructure functioning owing to the insufficient suitability of its branches to the market. The author considers details and main trends of infrastructure projects development in a down economy. Investment projects in production infrastructure, implemented as per public-private partnership flowchart, are most vulnerable during a crisis, which is determined by a complicated nature of this economic phenomenon and high risks. Pursuing such fiscal policy, the government suppresses reproduction processes in the infrastructural complex rather than increases them as it is practiced in most countries of the world.
Ethno-National and Geo-Political Identity of Caucasus
Authors: Gadzhiev K.
Published: April 2021

In the article, the problem of the Caucasus population identity is investigated, where a variety of socioeconomic, national-territorial, confessional, geopolitical and other challenges are tied up to a complicated knot. This clarifies the fact that the domestic political science has not yet given a scientifically based answer to the question: is it possible to speak about the Caucasus region as a universal Caucasus identity for representatives of all regional folks? If yes, what is its essence?
Europeanism and Atlanticism as Two Piers of Italy's Foreign Policy
Authors: Arbatova N.
Published: April 2021

In the article, the evolution of Europeanism and Atlanticism in Italy's foreign policy is examined. While assessing the formation of the European focus area in Italy's foreign policy after the collapse of bipolarity, it must be acknowledged that this process which had a distinct framework that no Italian government had gone beyond, was yet under a firm pressure of two approaches. In particular, the struggle between the adherents of the European idea, or a strong united Europe, and the Eurosceptics who strived to strengthen Italy's international positions by means of straddling not only between the EU and the U.S., but also between the EU, the U.S and Russia, determined the essence of the country's foreign policy in particular temporal rounds.
West European Social Democracy in the Early 21st Century
Authors: Rabotyazhev N.
Published: April 2021

The article is devoted to the evolution of the West European social democracy in the late 20th and early 21st century. The author analyses the causes of the social democracy crisis in 1980-90s and considers its attempts to meet the challenges of globalization and the “new economy”. Modernization of the British Labour Party under Tony Blair's leadership and updating of the German Social Democratic Party initiated by Gerhard Schröder are thoroughly examined in the article. Political and ideological processes ongoing in such parties as the French Socialist Party, the Dutch Labour Party, the Swedish Social Democratic Party, the Austrian Social Democratic Party are also considered. The author comes to a conclusion that the radical shift towards social liberalism took place merely in the British Labour Party. Schröder’s attempt to modernize the German Social Democratic Party turned out to be unsuccessful, while other European social democratic parties did not regard Blair’s “Third Way” as a suitable model for them.
Russia and USA: Prospects of Nuclear Weapon Reduction
Authors: Dvorkin V.
Published: April 2021

In the present article, the issues of weapon reduction between Russia and the U.S. in the light of the oncoming Treaty on the Reduction and Limitation of Strategic Offensive Arms (START I) extension are examined. Regardless of the further development of the situation with a new treaty-making perspectives, the analysis of application experience of such singular document as the START I Treaty appears not only insufficiently valuated, but quite timely, since many of its provisions are used and converted in one form or another during actual negotiations, and may evolve into a new treaty.
France: from Boom to Recession
Authors: Ostrovskaya H.
Published: April 2021

Measures taken by the French government to pull the country out of the financial and economic recession are analyzed and evaluated. Three moments are placed in strong relief: the efficiency of the government's reaction to the crisis; focus of the state efforts exactly on those directions where they were needed the most (countering the direct consequences of financial crisis, supporting the most damaged branches and companies, especially medium and small-sized); the principle of government regulation by dint of supplies, for the first time openly declared and carried out.
Where Venezuela Goes?
Authors: Dabagyan E.
Published: April 2021

The article is an attempt to summarize the results of Hugo Chávez's ten year rule in Venezuela. There has been a comprehensive reorganization of the political system institutional foundations. The new constitution has been approved, which proclaimed the country a Bolivarian Republic in honor of the great Latin American liberation hero. The unicameral National Assembly has replaced the National Congress. The president can now be reelected without any restraints, his term of office has been prolonged from 5 to 6 years. Typical for the Chávez's course is the use of formally democratic mechanisms in order to ensure the authoritarian rule. Prosecution of opposition figures has become commonplace. The initially proclaimed intermediate political course has been dismissed, the new slogan is the construction of a “21st century socialism”.
Crisis of Russian Business' Corporate Model
Authors: Peregudov S.
Published: April 2021

The article gives an overview of the factors that precondition the aggressive expansion of big corporate business (mostly of companies – raw materials producers) and, at the same time, stagnation in development of small and medium enterprises. The disproportions caused by these anomalies together with hierarchical character of relations between the State and the business sector greatly reduce the investment potential and the scope of Russian private and state companies’ innovative activities. The author sees the transition from a hierarchical model of business-State relations to a more balanced partnership interaction as a solution to the arising problems.
REGARDING AMORIS LAETITIA: ITS LANGUAGE, ITS RECEPTION, SOME CHALLENGES, AND AGNOSTICISM OF SOME OF THE HIERARCHY
Authors: Keenan James F.
Published: April 2021

Five years after its promulgation, the apostolic exhortation Amoris Laetitia is continuing to shape the church by reforming its pastoral ministry in particular, its work in marriage and family life. This essay looks at the key contents of the lengthy document by considering the rich language it uses as well as the varied imaginative modes of reception by bishops, theologians, and lay leaders. It investigates a sustained criticism that argues for further reform, though in line with the basic arguments of Amoris Laetitia. It notes, nonetheless, that in the United States some of the episcopacy display an indifference to the magisterial teaching and concludes suggesting that that indifference needs to be investigated.
Code-based Post-Quantum Cryptography
Authors: Balamurugan Chithralekha , Singh Kalpana , Ganesan Ganeshvani , Rajarajan Muttukrishnan
Published: April 2021

Cryptography has been used from time immemorial for preserving the confidentiality of data/information in storage or in transit. Thus, cryptography research has also been evolving from the classical Caesar cipher to the modern cryptosystems based on modular arithmetic to the contemporary cryptosystems based on quantum computing. The emergence of quantum computing imposes a major threat on the modern cryptosystems based on modular arithmetic whereby, even the computationally hard problems which constitute for the strength of the modular arithmetic ciphers could be solved in deterministic time. This threat triggered post-quantum cryptography research in order to design and develop post-quantum algorithms that can withstand quantum computing attacks. This paper provides a review of the various post-quantum cryptography and, in specific, code-based cryptography research dimensions. The research directions that are yet to be explored in code-based cryptography research is another key contribution of this paper.
Sustainable Urban Renewal and Densification in China: The Case of Suzhou in the Yangtze River Delta Region
Authors: Pellegrini Paola , Chen Jinliu
Published: April 2021

China is gradually and steadily shifting towards more sustainable development and the local governments are increasingly promoting sustainable spatial planning practices. The article debates the potential contradiction between the goal of a growing urban population and the reduced consumption of land planned by the sustainable development strategy of the city of Suzhou in the Yangtse River Delta region. The article explores the opportunities of densification of the residential urban environment as a possible solution for this contradiction. The article presents some Chinese examples of densification for land use efficiency and identifies in the resettlement communities of Suzhou some of the sites that can be efficiently redeveloped for their obsolescent conditions that do not correspond to the increasingly middle-class status of the residents in the region. The article investigates the different options of densification possible in the resettlement communities in the frame of the policies of urban renewal promoted in China in recent years for improving the urban quality of cities.
A Survey of Graphical Page Object Detection with Deep Neural Networks
Authors: Bhatt Jwalin , Hashmi Khurram Azeem , Afzal Muhammad Zeshan , Stricker Didier
Published: April 2021

In any document, graphical elements like tables, figures, and formulas contain essential information. The processing and interpretation of such information require specialized algorithms. Off-the-shelf OCR components cannot process this information reliably. Therefore, an essential step in document analysis pipelines is to detect these graphical components. It leads to a high-level conceptual understanding of the documents that makes digitization of documents viable. Since the advent of deep learning, the performance of deep learning-based object detection has improved many folds. In this work, we outline and summarize the deep learning approaches for detecting graphical page objects in the document images. Therefore, we discuss the most relevant deep learning-based approaches and state-of-the-art graphical page object detection in document images. This work provides a comprehensive understanding of the current state-of-the-art and related challenges. Furthermore, we discuss leading datasets along with the quantitative evaluation. Moreover, it discusses briefly the promising directions that can be utilized for further improvements.
Bibliometric Analysis of Composite Resin From 2000-2020
Authors: Ülkü Sultan Gizem , Ünlü Nimet
Published: April 2021

Introduction: To indentify the most effective actors(authors, countries, and journals) about composite resin restorations in the period 2000-2020.Material and Methods: An electronis research was conducted in the Scopus database by selecting the words ‘composite resin’ and ‘restoration and English language, article and review types, dentistry field. Their bibliometric data including publication title, authorship, citation count, citation dentistry, year of publication, country and institution of origin, journal of publication, study design, and keywords were extracted and analyzed.Results and Discussion: To our knowledge, this is the first bibliometric article on composite resin restorations. This study provides information about authors, institutions and countries that contribute to significant improvements in composite resin restorations. From 2000 to 2020, there were 7118 articles published from 99 countries.Articles originate primarily from the USA and Brazil. Results indicate that the USA, Brazil, Germany, Turkey, the United Kingdom, Japan, Swtizerland, Italy, Netherlands and India are the leading countries in composite resin restoration research and account for 51.8% of the total number of publications. The total number of citations are 158.404, corresponding to 22 citations per paper publication. During the time period examined, 776 hot articles and 228 classic articles on composite resin restorations were found.The journal with the most publications is ‘Operative Dentistry’. The publishing houses of the top 10 journals are from 4 countries: USA(6),Netherlands(2),Germany(1),Japan(1). The most cited article within the boundaires of this study is Ferracane’s article titled ‘Resin composite-State of the art’, which was published in Dental Materials in 2011 and received 913 citations.
$L^2$-диссипативность разностных схем для регуляризованных $\mathrm{1D}$ баротропных уравнений движения газа при малых числах Маха
Authors: Злотник Александр Анатольевич , Zlotnik Aleksandr Anatol'evich , Ломоносов Тимофей Александрович , Lomonosov Timofei Aleksandrovich
Published: April 2021

Изучаются явные двухслойные разностные схемы на разнесенных сетках для двух известных регуляризаций $\mathrm{1D}$ баротропных уравнений газовой динамики, включая схемы с дискретизациями по $x$ со свойством диссипативности по полной энергии. Выводятся критерии $L^2$-диссипативности в задаче Коши для их линеаризаций на постоянном решении с нулевой фоновой скоростью. Дается сравнение критериев для схем на неразнесенных и разнесенных сетках. Рассматривается также случай $\mathrm{1D}$ уравнений Навье--Стокса без искусственного коэффициента вязкости. Для одной из их регуляризаций максимальный шаг по времени гарантирует выбор параметра регуляризации $\tau_{opt}=\nu_*/c^2_*$, где $c_*$ и $\nu_*$ - фоновые скорость звука и кинематическая вязкость; такой выбор не зависит от сеток. Для анализа случая $\mathrm{1D}$ уравнений Навье-Стокса-Кана-Хилларда выводятся и апробируются также критерии $L^2$-диссипативности и устойчивости явной разностной схемы для нестационарного уравнения $4$-го порядка по $x$ со слагаемым $2$-го порядка по $x$. Полученные критерии могут быть полезны при расчете течений при малых числах Маха.
Алгоритм построения сетки на основе TetGen для моделирования внешнего обтекания осесимметричной модели
Authors: Широков Иван Анатольевич , Shirokov Ivan Anatol'evich
Published: April 2021

Описан оригинальный алгоритм построения расчетной сетки для моделирования внешнего газодинамического обтекания осесимметричной модели с использованием сеточного генератора TetGen. Алгоритм позволяет строить неструктурированные тетраэдральные сетки в пространстве вокруг модели таким образом, что ячейки вблизи поверхности имеют форму, близкую к правильным тетраэдрам. На таких сетках аппроксимация макроскопических уравнений осуществляется точнее, чем на сетках, содержащих тетраэдральные ячейки с малыми углами. Повышенная точность аппроксимации в области пограничного слоя может быть важным фактором изучения явлений отрыва потока и ламинарно-турбулентного перехода. Для построения такой пространственной сетки на начальном этапе строится сетка на поверхности модели, ячейки которой имеют форму, близкую к квадратам. На втором этапе на основе поверхностной сетки генератор TetGen строит пространственную тетраэдральную сетку, используя триангуляцию Делоне, при этом вводятся дополнительные точки вблизи поверхности модели, позволяющие получить тетраэдральные ячейки достаточно правильной формы в области пограничного слоя. Предлагаемый алгоритм достаточно универсален и может применяться для моделей произвольной осесимметричной формы, профиль которой задан в виде массива значений радиуса в зависимости от поперечного сечения. Пространственная сетка позволяет проводить моделирование внешнего обтекания для ненулевых углов атаки. Приведен пример расчета дозвукового обтекания модели на основе квазигазодинамического алгоритма, демонстрирующий возникновение вихревого участка в хвостовой части. Такой участок показывает возможность изучения нестационарных течений.
Investigating the English needs of law department students in English for specific purposes
Authors: Rumalessin Ummu Artha Tsary , Farah Rafika Rabba
Published: April 2021

This present study aims at investigating the students’ target needs in learning ESP Speaking of Law department students. The adapted version of Aliakbari & Boghayeri’s (2014) and Alsamadani’s (2017) questionnaire was used as the main instrument of this study to understand the 45 students’ perception about their needs in learning ESP speaking course. A mixed-method research design was implemented in this present research. Students’ responses were analyzed statistically using SPSS 16.0 by calculating the mean, frequency and percentage. To elicit more understanding on the topic, interview was implemented to senior students in order to get deeper investigation about students’ target needs. The interview data were then analyzed using NVivo 12 Plus. This study reveals that most of the students’ needs are concerned with their professional job in the future so they are able to use English in their fields. Thus, this study provides some highlighting points on what to include in course development. In such a notion, this study suggests lecturers provide specific materials related to law in order to face their professional life either in short- or long-term future needs.

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HIGHLIGHTS:

 This study pinpoints the result of Law students measurement on their self-rating towards their English competences.

This study highlights on materials related to Law department that are perceived to be strongly needed and less needed.

This study also reveals that according to students’ interview transcript, their needs in learning ESP are found to attain long-term goal compared to the short-term one.
Developing e-learning media in grammar instruction for beginner learners
Authors: Afidah Nurul , Hanifah  , Alkhoyyath Dliyauddin
Published: April 2021

The present study intended to develop E-learning media in teaching grammar for beginner learners. In developing the product, this study adapted the ADDIE model. The product that was developed using construct application focused on part of speech material. Thirty students of sixth grade enrolled on the implementation phase.  Before implemented the product, some experts gave some suggestions and critics related to the quality of the product. The final product consists of some explanations of part of speech along with exercises, and in each exercise it is provided direct feedback whether the answer is right or wrong. On the first slide, a cover is displayed with attractive and colorful background since the target learner is beginner. The language used in this product is fully in English to habituate the learners with English environment.  For the back sound, the researcher used rhythm only, not a song to avoid disturbing the learners. The researcher provides learning objectives. In this case there are three learning objectives. Then on the next slide it is showed eight part of speech that will be explained in detail. In material the researcher provided the definition and kinds of part of speech, also the example of part of speech. Moreover, the exercises were created in various types, ten questions in multiple choice and five questions in jumble word. This media can be used by anyone who needs it, and another researcher can develop similar media in different topic or level.

HIGHLIGHTS:

E-learning media that is implemented optimally can help the teacher in achieving learning objectives.

E-learning media can be used as an alternative media during class instruction especially grammar instruction.

In this digital era, the teacher is demanded to habituate to use e-learning media during class instruction.
Prediction of Field Saturations Using a Fully Convolutional Network Surrogate
Authors: Zhang Kai , Wang Yanzhong , Li Guoxin , Ma Xiaopeng , Cui Shiti , Luo Qin , Wang Jian , Yang Yongfei , Yao Jun
Published: April 2021

We are interested in the development of surrogate models for the prediction of field saturations using a fully convolutional encoder/decoder network based on the dense convolutional network (DenseNet; Huang et al. 2017), similar to the approaches used for image/image-regression tasks in deep learning. In the surrogate model, the encoder network automatically extracts the multiscale features from the raw input data, and the decoder network then uses these data to recover the input image resolution at the output of the model. The input of multiple influencing factors is considered to make our surrogate model more consistent with the physical laws, which has achieved good results in the prediction of output fields in our experiments. Various reservoir parameters including the static reservoir properties (i.e., permeability field) and dynamic reservoir properties (i.e., well placement) are used as input features, and the water-saturation distributions in different periods are taken as the output. Compared with traditional numerical reservoir simulation, which has a high computational cost and is time consuming, not only does it present the same precision, but it costs less time. At the same time, it can also be used for production optimization and history matching.
Comparative Study on Predicting Particulate Matter (PM2.5) Levels Using LSTM Models
Authors: Balamurali R. , Pachaivannan Partheeban , Elamparithi P. Navin , Hemamalini R. Rani
Published: April 2021

In recent times, air pollution has attracted the attention of policymakers and researchers as an important issue. The pollution that contaminates the air that people breathe is from pollutants such as oxides of carbon, nitrogen and sulphur as well minuscule dust particle which are smaller than 0.0025mm in diameter. The emissions contain many substances that are harmful to human health when exposed to them for a prolonged period or more than certain levels of concentration. The recent advent of technology in sensors and compact instruments to measure the concentration of pollutant levels with considerable ease. Further, this paper also predicts the air pollution for using multiple Deep Learning models that are variations of the Long Short-Term Memory (LSTM) model. In this research, only PM2.5 alone taken into consideration for prediction. Real-time air quality data were collected at selected places in the study area. It is found that the model prediction data is well matched with the other researchers' results and real-time data.
Construction of intimately coupled mesoporous Al2O3 nanosphere deposited 2D CdO with boosted charge separation, visible-light photocatalysis and bactericidal applications
Authors: B Janani , Khan S. Sudheer
Published: April 2021

Pristine Al2O3 and CdO are known to possess poor photocatalytic activity individually. The formation of CdO/Al2O3 heterojunction was investigated for the enhancement of photocatalytic performance. High resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) has been used to determine the crystalline feature and elemental composition of the NCs respectively . Peaks ascribed to Cd-O and O-Al-O was noted in fourier-transform infrared spectroscopy (FTIR) analysis. The NCs exhibits a high surface area (27.23 m2/g) to their contributing particles which was analysed using BET analyser. The band gap energy of CdO/Al2O3NCs was observed to be 2.95 eV which shows a considerable energy shift from its individual particles, CdO (2.73 eV) and Al2O3 (3.94 eV). The results displayed that the degradation efficiency of the CdO-Al2O3 NCs was enhanced 14 times than pristine Al2O3 and 3.5 times than pristine CdO. The MB dye has showed the half life period of 80 min. TOC analysis of degraded product supported high mineralization of the pollutants. The dye degradation was driven by OH. radicals and the CdO-Al2O3 nanocomposite possessed high reusability which was confirmed by six cycle test. Growth inhibition of E. coli, P. aeruginosa and B. subtilis was attained by exposure to CdO/Al2O3 NCs. The CdO-Al2O3 NCs can be a viable solution for degradation of organic contaminants effectively under natural sun light as well as an efficient antibacterial agent.
Study on the Law and Mechanism of Strata Movement Induced by Caving Mining of Slowly Inclined Large and Thick Orebody
Authors: Zhang Chao , Kang Mingchao , Fu Jianxin , Song Weidong
Published: April 2021

Taking the Western District of Chengchao Iron Mine as engineering background, based on the GPS monitoring data of 8 years and the record of the surface movement, the law of strata subsidence and movement is studied. The studies have shown that the surface movement caused by underground mining has the characteristics of time delay and displacement angle development has the law of jumping. The strata movement caused by mining is divided into the stage of overlying strata collapse and the collapse stage of surrounding rock to goaf. In the first stage, the vertical stress plays a leading role and rock failure is shown as a regular barrel collapse. In the second stage, horizontal tectonic stress plays a leading role and the collapse mechanism of rock strata can be explained by the cantilever beam theory. According to the mechanism of strata movement analysis, strata movement of Chengchao Iron is divided into six regions, which respectively included vertical subsidence area, toppling sliding zone, dumping area, deformation zone, cumulative deformation area and undisturbed zone. The results of this paper can provide a theoretical basis for the surface movement prediction of caving mining in similar metal mine.
Eotaxin-1expression in tears of thyroid-associated ophthalmopathy
Authors: haibo tan , kebo cai
Published: April 2021

Purpose To explore changes of Eotaxin-1concentration in tears of thyroid associated ophthalmopathy (TAO) patients Methods This prospective observational study.16 patients with TAO (32 eyes) and 18 healthy volunteers (36 eyes) were recruited.TAO patients were divided into active TAO (16eyes) and inactive TAO derived from the active TAO patients after corticosteroid treatment(16eyes).The tear concentration of Eotaxin-1 was measured per ELISA assay. Eotaxin-1protein expression was evaluated per Western Blot . Results The highest Eotaxin-1 concentration in tears was in inactive TAO patients, followed by patients with active TAO and the controls per ELISA. Western Blot analysis indicated that Eotaxin-1 expression in inactive TAO was also higher than in active TAO and the controls. Conclusion The changes of Eotaxin-1 expression in tears of patients with active and inactive TAO suggested that orbital inflammation may be involved in the ocular surface damage of TAO.