bluuebunny/crossref_metadata_2025 huggingface dataset:
THE USAGE OF UBVRI FILTERS AND SKY BRIGHTNESS MEASUREMENT (Study on 26 May 2021 Total Lunar Eclipse at ITERA Lampung Astronomical Observatory )
Authors: Prastyo Hendra Agus , Suraya Khabib , Putra Singgih Prana , Yusuf Aditya Abdilah , Hafizah Izatul , Oktaviandra Adhitya , Khagahdo Aziz Nugrahamuda , Kurniawan M R , Maharani Gabriella , Silahuddin Ababil
Published: September 2022

On May 26, 2021, the ITERA Lampung Astronomical Observatory (OAIL) got the opportunity to watch the Total Lunar Eclipse (TLE). The observations had two goals: determining the most efficient filter for observing the Penumbral Lunar Eclipse (PLE) and determining the influence of TLE phenomena on sky brightness. The acquired picture data is analyzed using the photometric approach. Six sample points are utilized to calculate the magnitude of the PLE. According to the findings, the blue filter is the generally ideal filter for detecting PLE. Tycho crater had the greatest magnitude of -18.1 while mare Imbrium had the highest magnitude of -17.2. When determining the intensity of the crater and mare, this value is impacted by various parameters, including the duration of the integration period and the aperture radius. As a result, this number still has to be adjusted to the full moon's intensity. The results of SQM measurements of the sky's brightness form a light curve pattern that declines during the umbra phase and continues to diminish until the Moon departs the Earth's penumbra. This shows that the value of sky brightness increases or the sky becomes significantly darker during the total phase, while the Moon's skyglow diminishes during TLE.
THE CONTRIBUTION OF DIGITALIZATION IN THE DEVELOPMENT OF ASTRONOMY IN INDONESIA
Authors: Awaludin Muhammad , Zar'ah Nur Fazriani
Published: September 2022

The Development of technology has a major impact on the development of Astronomy. The focus of this research is to analyze the impacts of the digitalization era on the development of Islamic astronomy discourses in Indonesia. This research is library research with a qualitative approach which aims to find out how the contribution of technology in the development of astronomy in Indonesia. The author's data sources in this study are scientific notes either in the form of books or notes from electronic media. The results of this study indicate that astronomy practitioners have made a new breakthrough in the development of astronomy, namely creating digital data-based applications to assist calculations. This scientific collaboration with technology and digitalization creates a harmony between astronomy and technology, thus making the study of astronomy in Indonesia more accommodating to digital era instead of just revolving around the study of science and religion.
THE IDEOLOGICAL TRANSFORMATION OF JAM'IYAH RIFA'IYAH IN DETERMINING THE QIBLA DIRECTION IN ADINUSO BATANG VILLAGE
Authors: Ikbal Muhammad
Published: September 2022

Technological developments make it easier for people to find the Qibla direction. However, the definition of the direction facing the Qibla which is varied according to fiqh causes public understanding of determining the direction of Qibla to be crowded into question. The concept of facing the Qibla taught by Ahmad Rifai in the Absyar book requires us to face the 'ayn al-ka'bah. This article discusses the concept of Qibla direction according to Ahmad Rifa'i and how the people of Adinuso-Batang Village respond to this thought. This article uses descriptive-qualitative method. This article finds that Ahmad Rifa'i's concept of Qibla direction is not in accordance with scientific theory and people prefer the results of scientific calculations over the results of their thoughts.
REVIEW ON THE TECHNIQUES OF DIRECTIONAL IDENTIFICATION THROUGH THE CELESTIAL OBJECTS AMONG ANCIENT MUSLIM ASTRONOMERS IN NORTHERN NIGERIA
Authors: Muhammad Bilyaminu
Published: September 2022

This article aims to reconstruct the old science adopted by ancient Muslim astronomers at that time due to the absence of technology to guide on sea and land. This paper adopts a qualitative method to describe the precise technique and strategy of its application for direction identification through the selection of several Stars, Satellites, Constellations and Coordinate which are visible both from the northern and southern parts of the northern Nigeria sky. On the other hand, several challenges were identified to affect the development of science in different dimensions such as total dependence on artificial innovative devices which may very well have limitations. This article recommends awakening to Astronomers, especially Nigerian Astronomers, to pay more attention to scientific aspects as the basis for the use of modern astronomical technology in every observation of celestial bodies.
Öğretmen Adaylarının Çevrimiçi Eğitmenlik Deneyimlerinin İncelenmesi
Authors: ORHAN ÖZEN Sevil , MAZMAN AKAR Sacide Güzin
Published: September 2022

Bu çalışmada öğretmen adaylarının çevrimiçi öğrenme ortamında edindikleri çevrimiçi eğitmenlik deneyimleri ve algılarının incelenmesi amaçlanmıştır. Bu amaç doğrultusunda gerçekleştirilen durum çalışmasında, öğretmen adaylarının çevrimiçi eğitmenlik deneyimlerinden yola çıkarak bu süreçte eğitmenler için ortaya çıkabilecek problemler ve olası çözüm önerileri belirlenmiştir. Çalışmaya bir devlet üniversitesinin iki farklı bölümünde okumakta olan 10’u çevrimiçi eğitmenlik deneyimi için moderatör olan ve moderatör öğrencilerin verdiği eğitimi dinleyip değerlendiren 12 kişi olmak üzere toplamda 22 öğrenci katılmıştır. Çalışmaya katılan moderatör öğretmen adayları tekno-parti adı verilen öğrenme etkinliği kapsamında çalışma odalarına ayrılarak, 20’dk süre ile çevrimiçi ortamda akranlarına eğitim verme deneyimi yaşamıştır. Uygulama sürecinin ardından öğretmen adayları ile yarı yapılandırılmış görüşmeler yapılmıştır. Katılımcılardan elde edilen görüşme verileri ve araştırmacı gözlem notları üzerinde içerik analizi yürütülmüştür. İçerik analizi sonucunda ortaya çıkan kodlar dört tema altında toplanmıştır. Buna göre birinci tema öğretmen adaylarının çevrimiçi eğitmenlik üzerine yaşadığı deneyimler, ikinci tema çevrimiçi ortamda yaşadıkları/yaşanabilecek aksaklıklara ilişkin çözüm önerileri, üçüncü tema bu deneyimin mesleki katkısına ilişkin görüşleri ve dördüncü tema gelecekte çevrimiçi eğitmenlik eğitimi üzerine verilebilecek bir program içeriği hakkındaki görüşleridir.
Memória e subjetividade
Authors: Küster Eliane , Vieira Alboni Marisa Dudeque Pianovski
Published: September 2022

O artigo tem por objetivo discutir os impactos da pandemia de Covid-19 em instituições públicas de Educação Infantil, em município da região metropolitana de Curitiba, PR, a partir da memória de gestores sobre o isolamento social, os encaminhamentos pedagógicos, a manutenção dos profissionais da educação em seus cargos, a participação dos pais e o desenvolvimento integral das crianças. A narrativa dos sujeitos foi analisada considerando suas subjetividades e seus espaços de poder. A pesquisa foi realizada na perspectiva da História Cultural, com apoio em Chartier (2002), Delory-Momberger (2014) e Lima, Geraldi e Geraldi (2015), entre outros. Do ponto de vista metodológico, o estudo teve caráter bibliográfico, documental e de campo. A pesquisa permitiu aprofundar e tensionar as diferentes subjetividades de profissionais da Educação Infantil, num espaço coletivo, por meio das memórias relativas ao momento histórico vivido.
(Im) possibilidades da formação subjetiva
Authors: Silva Alex Sander da , Canarim Guilherme Orestes , Teixeira Silvana Mazzuquello
Published: September 2022

O presente artigo investiga a problemática da condição emergencial da educação em tempos pandêmicos, sobretudo no que tange ao significado das (im)possibilidades da formação subjetiva. Nesse ínterim, delineamos alguns elementos das implicações educativas do cenário da pandemia do novo coronavírus. Delineia-se um diagnóstico das transformações sociais e educacionais no contexto atual e discute-se de que maneira isso sinaliza algo sobre os processos da formação subjetiva. A pesquisa se apresenta bibliográfica, com aspectos de revisão integrativa. Assim, trazemos autores que já vínhamos estudando juntamente com novos comentadores, que trazem elementos de contextualização para formar panorama do cenário educativo atual. Desse modo, entendemos que o recrudescimento da situação educativa é sinal do avanço de um quadro mais grave globalmente estabelecido. Uma condição social e civilizatória, grandemente agravada, pelo modelo social, ético e econômico-político, que permeia todas as dimensões no mundo contemporâneo e, consequentemente, tem fortes impactos sobre as possibilidades de formação subjetiva.
Tabu
Authors: Custódio Elivaldo Serrão , Foster Eugénia da Luz Silva
Published: September 2022

O artigo tem por objetivo (re)pensar a educação para as relações raciais em tempos que se revelam sombrios a partir do filme “Tabu”. O trabalho trata-se de uma pesquisa exploratória pautada em uma abordagem qualitativa reflexiva. Os resultados apontam que as políticas que vêm buscando instituir novas formas de se encarar e trabalhar as diferenças esbarram na ideia de uma identidade nacional homogênea, que desqualifica diferenças, impedindo que se dê o devido valor às especificidades da condição negra na sociedade. Sabemos que temos muito caminho a percorrer na criação e/ou valorização de outros modos de agir na educação, para além das tentativas de se elaborar um discurso isento, neutro e politicamente correto. É a educação sendo chamada a se posicionar.
Ensino remoto em tempos de pandemia
Authors: Rech Gislaine Zanoto , Pescador Cristina Maria
Published: September 2022

A opção pelo ensino remoto, nome atribuído à modalidade de aulas online ou à disponibilização de materiais impressos quando foi decretada a Pandemia da COVID-19, revelou-se a principal alternativa no Brasil com o intuito de manter o vínculo da escola com seus estudantes. No entanto, essa modalidade parece trazer consigo implicações no quesito relacional. Com isso em vista, o presente trabalho tem por objetivo analisar as modificações que possivelmente ocorrem no aspecto da interação professor-estudante por meio de relações dialógicas e afetivas, tendo em mente a aprendizagem dos estudantes em aulas não presenciais, sejam elas em formato de ensino remoto online síncrono ou assíncrono ou impresso. O estudo caracteriza-se como uma pesquisa teórica com foco na Teoria Freireana e se propõe a refletir sobre como as relações de diálogo e afeto interferem no processo educativo e consequentemente na aprendizagem do estudante.
Educação popular e expedições pedagógicas na prática educativa do povo indígena Gamela
Authors: Silva Maria do Socorro Pereira da , Santos Thaynan Alves dos , Silva José Wylk Brauna da
Published: September 2022

Os saberes originários e ancestrais do povo indígena Gamela, fundamentados na Educação Popular, protagonizam a luta pela permanência na terra e a autoidentificação de sua etnia, e constituem o tema central desse estudo. O questionamento de partida: como a Educação Popular contribui com processos formativos e educativos na luta do povo indígena Gamela, na comunidade Laranjeiras no Sul do Piauí? A abordagem qualitativa, a pesquisa do tipo investigação-ação participante, em Borda (1981), e a análise dialética qualificam a metodologia de descolonização do conhecimento na luta pelo direito ao território. As expedições pedagógicas reafirmam as experiências, os processos educativos e formativos do povo indígena Gamela, baseado na educação para o uso dos recursos hídricos, para o manejo sustentável das plantas nativas, como o buriti, e a luta pela posse da terra, enfatizando a diferença entre os direitos da posse da terra indígena e da terra civil, conforme prevê a constituição brasileira.
Memórias, subjetividades e diversidades culturais
Authors: Mwewa Christian Muleka , Zarbato Jaqueline Aparecida Martins
Published: September 2022

O dossiê tem como proposta entrelaçar a produção de conhecimento na educação, que envolve as dimensões analíticas com base nas memórias, nas subjetividades e nas identidades dissonantes. O COVID 19 demandou outras concepções sobre as identidades individuais e coletivas mediadas por mecanismos sociais, políticos e culturais. Os textos aqui apresentados aglutinam diálogos educativos, trajetórias subjetivas objetivadas, espaços de poder, feminismos, memórias e histórias que compõem o amplo processo de práticas discursivas acerca da inclusão, do empoderamento e do enfrentamento de situações de exclusão no contexto das diversidades culturais. Argumentamos, de forma geral, que as subjetividades, como um modo de autoanulação e/ou autoconhecimento, podem ser problematizadas, tensionadas e preteridas em diferentes âmbitos da Educação. Nesse sentido, aglutinamos nesse dossiê pesquisas (ensaios como forma) que projetam diálogos sobre como as identidades e alteridades são forjadas nas práticas a partir das memórias coletivas e das subjetividades, que no contexto pandêmico, também foram coletivas.
trabalho das professoras em tempos de pandemia Covid-19
Authors: Baptista Virgínia , Alves Paulo Marques
Published: September 2022

Ao longo da História foram vividas várias pandemias. Contudo, a atual doença covid-19 apanhou desprevenidas as sociedades e as pessoas individualmente, levando ao isolamento social e à experimentação de novas situações laborais, como no ensino a distância. Sendo a docência uma profissão feminizada, em Portugal, neste artigo procuramos discutir as consequências para as docentes da dupla jornada em casa, acumulando o trabalho laboral e o cuidar da família, o que se insere numa lógica geral do neoliberalismo. No entanto, verificámos que apesar de algumas mudanças na legislação e no quotidiano sobre a igualdade de género, coube essencialmente às mulheres o cuidar dos filhos e das filhas mais pequenas ou dos progenitores mais velhos e velhas. Logo, na prática diária, há um percurso ainda a fazer na profissão docente que conduza efetivamente à igualdade de género e de inclusão para a cidadania de todas as pessoas.
Gestão algorítmica da docência e educação em tempos de incerteza
Authors: Cechinel André , Mueller Rafael Rodrigo
Published: September 2022

Este artigo propõe-se a discutir as memórias educativas em tempos pandêmicos a partir da análise de um fenômeno recente, a saber, o crescente controle algorítmico da docência e da educação. Em poucas palavras, a pandemia da Covid-19 serviu e tem servido ao propósito de produzir o alinhamento entre, por um lado, o chamado capitalismo atencional e sua produção e acúmulo permanente de estímulos e dados, e, por outro, o espaço institucional das práticas educativas, até então pensado em termos de relativa autonomia e autocentramento. Para defender o argumento, dividimos o artigo em dois momentos: primeiro, assinalamos o surgimento de uma desconfortável figura para o campo da educação, o duplo ou Doppelgänger educacional; a seguir, discutimos o laço, cada vez mais sólido, entre gestão algorítmica e educação. O que se busca demonstrar, em suma, é que a educação constitui um campo fértil para o acúmulo de dados e a produção de estímulos segundo as demandas do capitalismo hoje, e que a pandemia da Covid-19 serviu para acelerar um processo de aclimatação e controle do campo já antes em curso.
Ensino superior e o empoderamento feminino
Authors: Zarbato Jaqueline  Aparecida Martins , Martins Lucinéia  Scremin
Published: September 2022

Esse artigo tem como objetivo refletir sobre as mulheres no Ensino Superior, apontando a contribuição do feminismo nas rupturas e continuidades da inclusão de gênero. Para tal, se analisam as possibilidades de inclusão e manutenção das ações em torno das mulheres em duas instituições do centro oeste do Brasil em tempos de pandemia de SARS-COV-19. Assim, se propõe uma análise sobre os diálogos possíveis nos aportes teóricos acerca das ondas feministas no Brasil e no Ensino Superior, as abordagens sobre igualdade de gênero, e os exemplos da busca pela manutenção e empoderamento das mulheres no Ensino Superior no período pandêmico. Metodologicamente apresentam-se as abordagens do movimento feminista, os diálogos sobre Ensino Superior brasileiro e mulheres, os percalços diante da pandemia e as ações desenvolvidas na Universidade Federal de Mato Grosso do Sul e Universidade Federal de Goiás, no centro oeste.
Diversidades, imprensa e história(s)
Authors: Pinto Adriana Aparecida , Souza Ana Clara Camargo de
Published: September 2022

As perspectivas de escrita deste artigo vão ao encontro da proposta geradora no sentido de discutir temas relacionados a diversidades, memórias e produção de sentidos múltiplos, estabelecendo uma escala temática com foco nas relações do tema, a partir da documentação de natureza impressa e periódica. Assim, o artigo tem como objetivo evidenciar elementos da pesquisa com a revista Jornal das Moças, nas edições que circularam entre os anos de 1950 e 1960, perfazendo um total de 557 edições. Foram examinadas 3 seções da publicação, Jornal da Mulher, Evangelho para as Mães e Carnet das Jovens, buscando perceber as formas de representação e tratamento atribuídas às mulheres no período. Os textos da publicação, embora com tom notadamente conservador, acompanham as mudanças sociais que favoreceram a condição feminina no período, no entanto, mantêm, como princípio, reforçar o papel da mulher com base nos pressupostos do colonialismo e patriarcado, relacionados sobretudo ao lugar da mulher na família e como administradora do lar.
Diversidade cultural em região fronteiriça
Authors: Martti Fernanda Cristina Martins , Santana Maria Luzia da Silva , Oliveira Natália Cristina
Published: September 2022

Este artigo tem como objetivo discorrer acerca dos entrelaçamentos entre sociologia da infância e educação escolar – com enfoque em regiões fronteiriças. Nosso interesse persiste à compreensão da construção cultural da infância, bem como sobre o lugar da educação escolar com intersecção à diversidade cultural. Com base no referencial bibliográfico e na literatura utilizada percebeu-se que a infância é uma construção social que varia entre os diferentes grupos de uma sociedade. Sendo assim, várias formas de se vivenciar a infância coexistem, que – por sua vez – nem sempre são consideradas nas instituições escolares. Acaba-se valorizando determinadas culturas – especificamente dominantes – em detrimento de outras, exercendo diversos formatos de violência simbólica. A concepção de criança universal, adotada pela escola, acaba por marginalizar as infâncias que fogem da convenção predominante. Com isso, a sociologia da infância deve redirecionar o olhar sobre os sujeitos a fim de contribuir com uma escola para além de reproduções sociais.
consideração da imprevisibilidade e da liberdade na construção de uma escola inclusiva
Authors: Lanuti José Eduardo de Oliveira Evangelista
Published: September 2022

As bases conceituais e legais da inclusão escolar nem sempre são problematizadas de modo a provocar uma ruptura com concepções e práticas pedagógicas voltadas à integração. Ao analisar o meu próprio trabalho de professor e pesquisador, encontrei na imprevisibilidade e na liberdade os pilares sobre os quais, a meu ver, a educação também pode ser edificada para acolher a todos, indistintamente. Neste ensaio, meu propósito é compartilhar, por meio da narratividade, o que penso sobre a inclusão no atual cenário brasileiro. Espero que as minhas experiências contribuam para que os professores repensem o que é um verdadeiro compromisso pedagógico com a inclusão e que, com isso, não admitamos toda e qualquer tentativa de retrocesso diante daquilo que o Brasil já conquistou nesse sentido.
Aile Hekimliği Performans Sisteminin İstatistiki Bölge Düzeyinde Etkinlik Analizi İle Değerlendirilmesi
Authors: Köse Aslı
Published: September 2022

Toplumun sağlık statüsünü yükseltmek için aile hekimliği önemli bir role sahiptir. 2011 yılında tüm Türkiye’de uygulanmaya başlanan aile hekimliği ile koruyucu sağlık hizmetlerine ulaşılabilirlik hedeflenir. Bu çalışma aile hekimliği performans sisteminin istatistik bölge düzeyinde etkisinin değerlendirilmesi amacıyla yapılmıştır. Bu amaçla istatistik bölgelerin aile sağlığı hizmetleri ile ilişkili bir girdi ve 6 çıktı değişkenine veri zarflama analizi uygulanmıştır. Yöntem olarak Charnes, Cooper ve Rhodes tarafından geliştirilen girdi yönelimli model kullanılmıştır. Analizler EMS paket program ile yapılmıştır. 2011-2019 yıllarını kapsayan çalışmada kullanılan veriler Sağlık İstatistik Yıllıklarından elde edilmiştir. Bölge ve yıllara göre etkin olma ya da olmama durumunun değişkenlik gösterdiği belirlenmiştir. 2018 yılında ise sabit ve değişken olmak üzere her iki ölçek türünde de etkinsizlik yaşanmıştır. 2011-2019 yılları arasında Orta Anadolu bölgesi etkin, Güneydoğu Anadolu bölgesinin ise etkin olmadığı belirlenmiştir. Aile hekimliği sisteminin etkinliği ve bölgesel farklılıkları azaltacak düzeyde kaynakların etkin kullanımını sağlayacak iyileştirmelere ihtiyaç vardır.
Stenen van betekenis: hunebedden als erfgoed en als actor
Authors: Raemaekers Daan , Bosscher Femke , Wolters Harrie
Published: September 2022

Meaningful stones: megalithic tombs as heritage and actor. The Dutch megalithic tombs have seen a long history of protective measures by the government. These measures have resulted in our present-day appreciation of these monuments. They also created the tranquil, ‘natural’ setting, and thus affect our behaviour as visitors. At the same time, these tombs are very much part of the fabric of the present-day society where people have various personal associations with these tombs and their environs memories. As a rule, both aspects (formal heritage policies and personalassociations) reinforce one another, but always within a spatial and behavioural framework defined by governmental policies.
Identification of optical magnetic resonances generated in a neon discharge by coherent transitions of spatially separated isotopically different atoms
Authors: Saprykin E. G.
Published: September 2022

Infrared (IR) transitions are identified in the neon spectrum in the range 0.76-15.8 μm, they generate resonances due to quadrature field synchronization of spatially separated isotopically different atoms. The use of numerical methods for the analysis of low-contrast IR resonances made it possible to estimate the previously unknown isotopic shifts of their parent transitions levels. A change in the amplitude sign of quadrature optical-magnetic resonances with a change in the isotopic shift sign of the transitions that generate them is found, and the dependence of the lifetime of such coherent atom pairs on the transitions wavelength is recorded, showing an unusual reaching the plateau as the wavelength decreases. It is assumed that this is due to expansion of the response time of the neighboring excited atoms of the isotopic pair to their fields interference. Keywords: neon, IR transitions, field interference, coherent atom pairs.
Vibrational Spectroscopic and Molecular Docking Studies of Amrinone, a Cardiotonic Inotropic Drug
Authors: Celik Sefa  , Akyuz Sevim  , Ozel Aysen E.  , Akalin Elif
Published: September 2022

Amrinone is a class I cardiotonic inotropic agent, which is known to increase the cyclic adenosine monophosphate (cAMP) level by inhibiting the phosphodiesterase 3 (PDE3) enzyme. In this study the theoretically possible stable conformations of the amrinone, was examined first by conformational analysis method and then the obtained most stable conformation was optimized by DFT/wb97xd/6-311++G(d,p) level of theory using Gaussian 03 program. The credibility of the theoretical model was confirmed by comparison of experimental and theoretical vibrational spectra of the title molecule. The fundamental vibrational wavenumbers, IR and Raman intensities of the optimized structure of amrinone were determined using DFT/wb97xd/6-311++G(d,p) level of theory and compared with the experimental vibrational spectra. To investigate the influence of amrinone on cAMP enhancement, the docking simulations towards PDE3B were carried out and the main binding interactions of amrinone with PDE3 were elucidated. Cytochrome P450s (CYPs) are very important phase I metabolizing enzymes.The interaction between amrinone and CYPs (CYP1A2, CYP2C9 and CYP2C19) was investigated by docking simulations. Moreover, molecular docking of the title molecule with different proteins and receptors were studied to reveal potential mechanisms for therapeutic applications. Molecular docking simulations revealed that amrinone showed strong binding affinity to integrins α5β1 (Delta G= - 6.6 kcal/mol) and αIIbβ3 (-6.6 kcal/mol), and DNA (-6.5 kcal/mol). The results correlated with its anticancer activity. The drug likeness and ADMET properties of amrinone were analyzed for the prediction of pharmacokinetic profiles. Key words: amrinone, DFT calculations, FTIR, molecular docking, ADMET.
Study of plasmon resonance in Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=- and Sb-=SUB=-2-=/SUB=-Te-=SUB=-3-=/SUB=- by infrared spectral ellipsometry
Authors: Alizade E.H.
Published: September 2022

In the infrared region of the spectrum (IR), the optical properties of single-crystal samples of narrow-gap degenerate semiconductors Bi2Se3 and Sb2Te3 are investigated by infrared spectral ellipsometry (SE). The transport properties of the Drude fitting of dielectric functions obtained by spectroscopic ellipsometry are studied. The behavior of the bulk and surface plasmon polaritons is investigated in detail. The dispersion and mean free path of the plasmon, the depth of the skin layer for the conducting and dielectric surfaces are calculated. The contribution of the plasmon to the optical properties is estimated from the spectral density for the Bi2Se3 and Sb2Te3 samples. Keywords: ellipsometry, plasmon, plasmonics, plasmon dispersion, plasmon mean free path, plasmon penetration depth.
Helmholtz-Gauss beams with quadratic radial dependence
Authors: Plachenov A. B.  , Dyakova G. N.
Published: September 2022

A new class of localized solutions of paraxial parabolic equation is introduced. Each solution is a product of some Gaussian-type localized axisymmetric function (different from the fundamental mode) and an amplitude factor. The latter can be expressed via an arbitrary solution of the Helmholtz equation on an auxiliary two-sheet complex surface. The class under consideration contains well known and novel solutions, including those describing optical vortices of various orders. Keywords: parabolic equation, quadratic beams, Gauss, Helmholtz, Bessel.
Synchronous control of transmitted and reflected light in semicomducting chromiumchalcogenide spinels
Authors: Telegin A. V.  , Sukhorukov Yu. P.
Published: September 2022

A way for synchronous control of the intensity of transmitted and reflected light in magnetic semiconductors by an external magnetic field is proposed in the infrared spectral region. For illustration, we obtained the magnetoreflection and magnetotransmission spectra of unpolarized light in single crystals of Hg(Cd)Cr2Se4 spinel. Keywords: Magnetoreflection, magnetotransmission, spinel, infrared range, unpolarized light, single crystals.
On relations of the T-matrices arising in the axisymmetric problem of light scattering by a spheroid
Authors: Farafonov V. G.  , Il'in V. B.  , Turichina D.G.
Published: September 2022

The relations between the T-matrices emerging when solving the problem of light scattering by a spheroid by applying the expansions of the electro-magnetic fields in the employing spheroidal and spherical bases are found. The behavior of the obtained relations is numerically studied, and it is noted that in a wide range of the task parameter values the calculation of the spheroidal T-matrix and its corresponding transformation is the only practical way to derive the spherical T-matrix often used in applications. Keywords: light scattering, T-matrix.
Synthesis and study of the luminescent properties of terbium-activated gadolinium tantalum-niobate
Authors: Gusev G. A.  , Masloboeva S. M.  , Yagovkina M. A.  , Zamoryanskaya M. V.
Published: September 2022

For the first time, terbium-activated gadolinium tantalo-niobates were synthesized ((Gd1-xTbx)NbyTa1-yO4). The synthesis was carried out by the liquid-phase method. All studied materials had the main crystalline modification M GdNbO4. The content of impurity phases did not exceed 2-5%. The photo- and cathodoluminescence spectra were studied. Concentration quenching of the terbium ion luminescence for a series of solid solutions containing tantalum ((Gd1-xTbx)Nb0.9Ta0.1O4) occurs earlier than for pure gadolinium niobates ((Gd1-xTbx)NbO4). The obtained materials are promising for use as scintillators. Keywords: gadolinium tantalum-niobates, liquid-phase synthesis, Tb3+, luminescence, cathodoluminescence.
Spectral optical properties of ceramic nanoporous membranes based on anodic aluminium oxide coated silver in ammonia vapors
Authors: Vasilkov M.Y.  , Mikhailov I. N.  , Nikulin Y.V.  , Volchkov S.S.  , Zimnyakov D.A.  , Ushakov N.M.
Published: September 2022

Spectral optical properties of synthesized ceramic nanoporous membranes based on anodic aluminum oxide coated silver in saturated ammonia gas flow have been experimentally investigated. Based on the measured transmission spectra and detected interference part of the spectra in wavelength range from 550 to 900 nm, temporal and spectral dependencies of the effective optical thickness and its changes in non-equilibrium conditions were obtained due to adsorption of ammonia molecules on silver film surface. According to detected and measured interference maximum shifts up to 14 nm in transmission spectra of Al2O3 + Ag membranes in ammonia gas flow, the possibility of constructing a selective interferometric optical sensors with 10-15 min response time is shown. Keywords: porous anodic aluminium oxide, membrane, silver film, light interference, ammonia vapors, effective optical thickness, interference maximum shift.
On photostability of acrylate and polymethyl methacrylate planar fiber-like structures with CUMARIN 7, 47, 120; POPOP; NOL8 luminophores for UV information systems
Authors: Britvin A. V.  , Nikitenko N. S.  , Plyusnin V. F.  , Poller  B. V.  , Poller A. B.  , Shakhov N. V.
Published: September 2022

Studies of photostability of planar fiber-like structures in the form of films 600-800 μm thick made of high-purity polymethyl methacrylate (PMMA) and acrylic resin, in which CUMARIN 7, 47, 120; POPOP, NOL8 luminophores were introduced, were carried out under long-term ultraviolet (UV) irradiation. NOL12 (KNL12) luminophore was in polymer fibers produced by "Engineering Centre for Polymer Optical Fibers" LLC. PMMA fiber-optic guides were attached to the ends of the films, from the output of these guides the luminescence radiation power was measured as a function of the UV irradiation power and time. The prospects of applying Cumarin-type luminophores for using planar fiber-like structures in UV information systems as receiving antennas for optical telecommunications and optical sensors for monitoring physical fields are shown. Keywords: photostability, planar fiber-like structures, luminophores, information systems.
Photoinduced charge transfer in layered 2D PbSe-MoS-=SUB=-2-=/SUB=- nanostructures
Authors: Skurlov I. D.  , Parfenov P. S.  , Sokolova A. V.  , Tatarinov D. A.  , Babaev A. A.  , Baranov M. A.  , Litvin A. P.
Published: September 2022

Semiconductor 2D nanostructures are a new platform for the creation of modern optoelectronic devices. Layered 2D PbSe-MoS2 nanostructures with efficient photoinduced charge transfer from PbSe nanoplatelets (NPLs) to MoS2 were created. When PbSe NPLs with short organic ligands are deposited onto a thin layer of MoS2 NPLs, a decrease in their photoluminescence intensity and a decrease in the average photoluminescence lifetime are observed. When a layered 2D PbSe-MoS2 nanostructure is illuminated with IR radiation, a photocurrent appears, which indicates the contribution of PbSe NPLs to the electrical response of the system. Ultrathin layers of transition metal dichalcogenides sensitized with nanostructures based on lead chalcogenides can be used in photodetectors with a spectral sensitivity region extended to the near-IR range. Keywords: nanoplatelets, transition metal dichalcogenides, charge transfer, near infrared region.
Identification of NV Centers in Synthetic Fluorescent Nanodiamonds and Control of Defectiveness of Crystallites Using Electron Paramagnetic Resonance
Authors: Osipov V. Yu.  , Bogdanov K.V.  , Treussart F.  , Rampersaud A. A.  , Baranov A. V.
Published: September 2022

A 100 nm synthetic diamond particle with a large (> 4 ppm) amount of nitrogen vacancy (NV) centers has been studied. The latter exhibit lines associated with forbidden Delta m_s = 2 and allowed Delta m_s = 1 transitions in the electron paramagnetic resonance (EPR) spectra of the ground state of the NV(-) center. The luminescence intensity of particles in the range 550-800 nm increases with an increase in the irradiation dose of 5 MeV electrons and correlates with the integrated intensity of the EPR line with a g-factor g = 4.27. This value is used to estimate the concentration of NV(-) centers and to select diamond powders with the highest fluorescence intensity. The dependence of the EPR signal intensity of the Delta m_s = 2 transition of the NV(-) center on the microwave power has the form of a curve with saturation and subsequent decay, and rather well characterizes the crystal quality of the local environment of the centers under study in these particles. The intensity of the x, y Delta m_s = 1 transition (at ~ 281.2 mT, 9.444 GHz) turns out to be more sensitive to changes in particle size in the submicron range and the appearance of near-surface defects obtained during mechanical processing. Keywords: luminescence, nitrogen vacancy centers, synthetic diamond, nanocrystals, electron paramagnetic resonance.
Orange dye removal efficiency by few-layer graphene: an investigation by UV-Vis spectroscopy
Authors: Motahari H.  , Mohammadi Hoorieh Shaterian  , Behjat Abbas
Published: September 2022

Nowadays, few-layer graphene (FLG) has been introduced as a new type of adsorbent. In this research the orange dyes including methyl orange (MO) as an industrial dye and the soft drink orange dye (orange Fanta soda) as a food dye have been removed by FLG adsorbent. In all steps UV-Vis spectroscopy as a valuable and fast method has been applied. The optical absorption coefficient has been decreased from 0.9 to less than 0.2 by FLG adsorbent for 50 ppm MO dye solution. Therefore, the MO solution with 50 ppm concentration converts to about 10 ppm output solution using 0.05 g of FLG adsorbent in a few minutes. It is about 80% adsorption dye removal efficiency. Also, MO dye removals have been performed in the range of 10 ppm to 500 ppm concentrations, but as the concentration of the solution increases, the dye adsorption ability of FLG decreases.The maximum efficient and optimum MO dye concentrations are about 100 ppm and 50 ppm, respectively, due to 0.05 g FLG adsorbent. It has been completely saturated at about 500 ppm concentration MO dye solution.Also, it has been observed that for 50 ppm MO dye solution increasing the amount of mass adsorbent from 0.05 g to 0.25 g can cause the output MO concentration to decrease from 10 ppm to 3 ppm. It has been revealed that about 94% of MO dye can remove by 0.25 g FLG adsorbent. The contact time due to 94% MO removal process is less than 5 minutes. Therefore, only by 0.25 g of FLG adsorbent we can purify wastewater containing 50 ppm MO dye to less than 3 ppm dye concentration, at less than a few minutes. Finally, the FLG glass tube filter can remove more than 90% food orange dye in less than 90 seconds for 50 ml of soft drink solution. Therefore, the FLG tube filtration process is so fast, easy, and high efficient. Key words: adsorption, few-layer graphene, methyl orange, UV-Vis spectroscopy, orange dye.
On the area of extremely short electromagnetic pulses in medium for problems of a finite integration region
Authors: Nikolaev V. G.
Published: September 2022

Based on the one-dimensional Maxwell equations of electrodynamics of continuous medium, the balance ratios of electric and magnetic areas for problems solved in a finite region in space and time are obtained. Keywords: extremely short pulses, electrical pulse area.
The vibrational-rotational high-resolution spectrum in the region of 3ν-=SUB=-4-=/SUB=-, ν-=SUB=-2-=/SUB=-+2ν-=SUB=-4-=/SUB=- and 2ν-=SUB=-2-=/SUB=-+ν-=SUB=-4-=/SUB=- bands of the -=SUP=-72-=/SUP=-GeH-=SUB=-4-=/SUB=- molecule
Authors: Kuznetsov A. V.  , Raspopova N. I.  , Gromova O. V.  , Bekhtereva E. S.  , Koshelev M. A.  , Velmuzhova I. A
Published: September 2022

The high-resolution spectrum of the 72GeH4 molecule was recorded on a Bruker IFS 125HR Fourier spectrometer with an optical resolution of 0.003 cm-1. The line positions were analyzed for ten interacting vibrational-rotational bands 3ν4 (1F2, F1, 2F2), ν2+ 2ν4 (1E, F1, F2, 2E) and 2ν2+ν4 (1F2, F1, 2F2) in the range 2350-2750 cm-1. As a result of the analysis, 1726 experimental lines were identified with the maximum value of the quantum number Jmax = 17; then used in the fitting procedure with parameters of the effective Hamiltonian. The resulting set of 35 spectroscopic parameters describes the vibrational-rotational structure of the spectrum with drms = 7.5· 10-4 cm-1. Keywords: GeH4, spectroscopic parameters, vibrational spectrum analysis, high-resolution Fourier spectra.
Sub-Doppler resonances caused by photoionization of atoms in thin gas cells
Authors: Izmailov A. Ch.
Published: September 2022

By analogy with the well-tested method of high-resolution spectroscopy in thin gas cells for the processes of optical pumping of atoms, this work shows the possibility of detecting narrow sub-Doppler optical resonances caused directly by straight photoionization of atoms (or molecules) in such cells. The structure of the established nontrivial resonances substantially depends on the probability of photoionization of atoms and dimensions of such a cell, the internal thickness of which is many times smaller than its diameter. Of particular interest is the broadening of the considered sub-Doppler resonances, which is determined directly by the photoionization cross section of atoms and the intensity of radiation causing ionization. Under certain conditions, such photoionization broadening can be measured experimentally with high accuracy, as a result of which it is possible to obtain new important information about ionization processes in atoms and molecules. Keywords: sub-Doppler resonances, photoionization of atoms, thin gas cell, transit-time relaxation of atoms.
Optical properties of ferroelectric films Hf-=SUB=-x-=/SUB=-Zr-=SUB=-y-=/SUB=-O-=SUB=-2-=/SUB=- and La : Hf-=SUB=-x-=/SUB=-Zr-=SUB=-y-=/SUB=-O-=SUB=-2-=/SUB=- according to ellipsometry data
Authors: Kruchinin V.N.  , Spesivtsev E.V.  , Rykhlitsky S.V.  , Gritsenko V.A.  , Mehmood F.  , Mikolajick T.  , Schroeder U.
Published: September 2022

Recently ferroelectric properties have been found in hafnia-based nanosized films. Such films are of the utmost interest for development of a universal memory, which combines the advantages of random access memory and flash memory. The paper studies optical properties of hafnia-zirconium oxide films HfxZryO2 and lanthanum-alloyed hafnia-zirconium oxide films La : HfxZryO2. Fluctuations of thickness in HfxZryO2 do not exceed 3.5%, fluctuations of thickness in La : HfxZryO2 films --- 3.2%. Optical properties are analyzed based on effective-medium theory. According to effective-medium theory data, HfxZryO2 films contain 46% HfO2, 54% ZrO2, La : HfxZryO2 films contain 47.5% HfO2, 52.4% ZrO2, 2.5% La2O3. Keywords: ferroelectric, refraction index, spectral ellipsometry, effective-medium theory.
Four-wave mixing by phase-amplitude holographic gratings in the photorefractive piezocrystal of 43m symmetry class
Authors: Naunyka V. N.
Published: September 2022

A system of coupled-wave equations for calculating the vector amplitudes of linearly polarized light waves at four-wave mixing by phase-amplitude holographic gratings in a cubic photorefractive semiconductor of an arbitrary cut belonging to the 43m symmetry class is presented. The dependencies of the intensities of the polarization components of the reversed light wave on the orientation angle for GaAs crystal of (110)-cut are calculated on the basis of the numerical solution of the system of coupled wave equations. The obtained dependences are compared with the known theoretical and experimental data. It is shown that the best agreement between the results of theoretical modeling and experimental data at calculating the contra-directional four-wave mixing in GaAs crystal of (110)-cut is achieved if formation of several phase-amplitude holographic gratings is allowed, and the contribution of the photoelastic and inverse piezoelectric effects are taken into account together with absorption of the crystal. Keywords: four-wave mixing, photorefractive semiconductor, light wave, holographic grating, coupled wave equations.
Raman lidar system for the hydrogen molecules remote sensing in atmosphere
Authors: Privalov V.E.  , Shemanin. VG
Published: September 2022

Computer simulation of the Raman lidar equation for measurement of the hydrogen molecules at the concentration level of 1013 cm-3 and higher in atmosphere at the ranging distances up to 100 m in the synchronous photon counting mode and selection of such a lidar optimal parameters have been fulfilled. It is shown that for hydrogen molecules concentration of N(z)=1013 cm-3 measurement at the distances from 5 to 100 m the measurement time t is in the range from 3.83 s to 26.5 min, for measurement of concentration N(z) = 1015 cm-3 --- from 38 ms to 15.9 s and for the concentration measurement of N(z) = 1017 cm-3 --- already from 0.4 ms to 160 ms, respectively. Keywords: Raman lidar, hydrogen molecule, concentration, ranging distance, laser radiation wavelength.
Pulsed RF excitation inductive discharge CO-=SUB=-2-=/SUB=- laser with the radiation energy of 1 J and high efficiency
Authors: Razhev A M  , Kargapol`tsev E. S.  , Trunov I. A.
Published: September 2022

An efficient pulsed gas-discharge inductive CO2-laser with a radiation energy of 1.05 J has been developed for the first time. In this case, the pulse duration of the laser radiation was about 10 msec. The maximum efficiency of 21.1% was obtained at a radiation energy of 340 mJ. HF current pulses propagated along the inductor conductor and, thus, an inductive discharge was formed to create a population inversion at the infrared (IR) transitions of CO2* molecules. The temporal and energy characteristics of the radiation of the inductive CO2-laser depending on the duration of the pump pulse are investigated. The spatial characteristics and spectrum of the radiation of the developed laser are estimated. The divergence of the laser radiation was 0.52 mrad. The cross-sectional dimension of the laser output beam was about 35 mm in diameter. Keywords: inductive discharge in a mixture of gases, high-frequency modulation of the pump voltage, population inversion, output characteristics of laser radiation.
Excitation and ionization of a particle in a one-dimensional potential well of zero radius by an extremely short light pulse
Authors: Arkhipov R. M.  , Arkhipov M. V.  , Pakhomov A. V.  , Rosanov N. N.
Published: September 2022

The Migdal sudden perturbation approximation is used to solve the problem of excitation and ionization particles in a one-dimensional potential of zero radius with an extremely short pulse. There is only one energy level in such a one-dimensional the delta-shaped potential well. It is shown that for pulse durations shorter than the characteristic period of oscillations of the wave function of the particle in the bound state, the population of the level (and the probability of ionization) is determined by the ratio of the electric area of the pulse to the characteristic "scale" of the area inversely proportional to the size of localization of the particle in a bound state. Keywords: unipolar pulses, electrical pulse area, atomic scale of electric area.
Photocontrolled reversible changes in the electronic and vibrational spectra of photochromic diarylethene in various nanostructured systems
Authors: Vasilyuk G. T.  , Karpach P. V.  , Gogoleva S. D.  , Ayt A. O.  , Barachevsky V. A.  , Maskevich S. A.
Published: September 2022

An analysis of the results of complex experimental and theoretical studies of photoinduced changes in the spectral properties of photochromic diarylethene in various nanostructured systems is presented. The properties of diarylethene were studied in solutions in the presence of colloidal metal and semiconductor nanoparticles, as well as in the form of solid-phase composite nanostructured core-shell systems based on colloidal nanoparticles with a shell of diarylethene molecules (including in a polymer matrix). A photoinduced reversible change in the electronic and vibrational spectra of diarylethene in various studied matrices was found. The results can be used to create optoelectronic photo-switchable elements for ultra-high-capacity memory devices, photo-controlled molecular switches and sensors. Keywords: photochromism, diarylethenes, nanocomposites, quantum dots, electronic spectra, vibrational spectra, fluorescence, Ferster resonance energy transfer, quantum chemical calculations.
Switching effects in plasmon circuits based on thin metal films and nanostructures with increased photoconductivity
Authors: Gubin M.Yu.  , Dzedolik I. V.  , Prokhorova T. V.  , Pereskokov V. S.  , Leksin A. Yu.
Published: September 2022

The features of optical control of surface plasmon-polariton propagation in plasmon circuits based on thin metal waveguides and semiconductor nanostructures are considered. A model of a plasmon resonator with additional elements based on semiconducting materials exhibiting strong photoconductivity is proposed. By means of numerical simulation, the possibility of switching the surface plasmon-polariton flux in the plasmon circuit by switching on/off the external optical pumping field, which changes the contribution of light-induced conduction of control elements, is shown. Keywords: surface plasmon-polaritons, metal plasmon waveguide, photoconductivity, plasmon resonator.
Influence of high pressures on the formation of new phase in the Al-=SUB=-86-=/SUB=-Ni-=SUB=-2-=/SUB=-Co-=SUB=-6-=/SUB=-Gd-=SUB=-6-=/SUB=- alloy
Authors: Menshikova S. G.  , Brazhkin V. V.
Published: September 2022

The structure, elemental and phase composition of the eutectic alloyAl86Ni2Co6Gd6 (hereinafter referred to as at.%) During the solidification of the melt from 1500oC at a rate of 1000oC/s under high pressure of 3 and 7 GPa have been investigated by X-ray diffraction analysis and electronmicroscopy. Solidification of the melt under high pressure leads to achange in the phase composition of the alloy and the formation of ananomalously supersaturated solid solution of α-Al(Gd). At a pressure of 7 GPa, new phases were synthesized: Al3Gd* (like Al3U) containing Co and Ni, with a primitive cube structure (cP4/2) with a lattice parameter a=4.285±0.002 Angstrem and Al8Co4Gd* (like Al8Cr4Gd) with a tetragonal structure (tI26/1) with parameters a=8.906±0.003 Angstrem and c=5.150±0.003 Angstrem. The structure of all the samples obtained is homogeneous, dense, finely dispersed, without shrinkage cavities and pores. The average microhardness of the samples is high due to solid solution and precipitation hardening. Keywords: high pressure, microstructure, phase, microhardness, melt.\