bluuebunny/crossref_metadata_2025 huggingface dataset:
PENGEMBANGAN E-BOOK FLIP PDF DENGAN MODEL DISCOVERY LEARNING PADA MATERI POKOK LAJU REAKSI (STUDI PADA KELAS XI SMA NEGERI 5 LUWU)
Authors: Ummul Haeriah , Jusniar Jusniar - , Hardin Hardin
Published: March 2023

Penelitian pengembangan ini bertujuan untuk menghasilkan e-book flip PDF yang valid, praktis, dan efektif. Penelitian ini adalah Researc and Development dengan menggunakan model ADDIE (Analysis, Design, Development, Implementation, and Evaluation). Instrumen yang digunakan adalah lembar validasi ahli media dan materi, angket respon peserta didik dan guru, lembar observasi keterlaksanaan pembelajaran, dan tes hasil belajar. Subjek penelitian yaitu ahli media dan materi yang masing-masing terdiri dari 2 orang, guru kimia berjumlah 1 orang dan 30 peserta didik kelas XI MIA 1. Hasil penelitian ini adalah: (1) Kevalidan e-book yang telah divalidasi diperoleh hasil kevalidan sebesar 3,71 dan 3,49 yang berada pada kategori sangat valid (ahli media maupun ahli materi), (2) Kepraktisan e-book dari presepsi pengguna masing-masing menunjukkan persentase 91,09% guru dan 90,97% siswa merespon positif (sangat praktis). Hasil kepraktisan melalui lembar observasi keterlaksanaan pembelajaran dalam model discovery learning menunjukkan ratarata persentase yakni 97,07%, dengan kategori sangat tinggi, (3) Keefektifan e-book ditentukan dengan uji empiris berdasarkan hasil belajar peserta didik diperoleh hasil memenuhi kriteria efektif (≥ 80%) berdasarkan KKM 75 mencapai ketuntasan kelas dengan persentase 87,88%. E-book flip PDF yang dikembangkan dengan model ADDIE telah memenuhi kriteria valid, praktis, dan efektif untuk digunakan dalam pembelajaran
Effects of Multi Walled Carbon Nanotube and Silicon Carbide Reinforcement on Wear Performance in Zinc-Aluminium Alloys
Authors: YALÇIN Emre Deniz , ÇANAKÇI Aykut
Published: March 2023

In this study, hybrid composite materials were produced by adding SiC (Silicon carbide) and MWCNT (Multi-walled carbon nanotube) to Zinc-Aluminium (ZA40) alloy, sintering under 700 MPa pressure and 500 °C using mechanical alloying and hot press technique. Hybrid samples were produced with 2% MWCNT constant and SiC ratio 1-2-3 and 4% by weight in the mixtures. The mechanical properties such as hardness and porosity of the produced hybrid composite materials were determined and their wear properties were investigated by traveling 300 m using 10 and 20N loads under 300 rpm constant speed in a ball-on-disc wear test setup. The obtained internal structure and wear surface images showed that the SiC and MWCNT reinforcement contributed significantly to the wear resistance of the hybrid composites, and in the SEM analyzes of the worn surfaces, there was a transition from abrasive wear to adhesive wear in the wear mechanism.
Retos del Covid
Authors: Pernet Carrillo Emir Hernando , Corral Strassmann Maria Mercedes
Published: March 2023

La Transformación Digital, cuyo origen se puede rastrear a los años 90 con el auge en el desarrollo de productos y servicios digitales, últimamente se ha convertido en una tendencia que está revolucionando los modelos de negocios, siendo un factor disruptivo para el mercado y la sociedad. Durante las dos primeras décadas de este milenio, las tecnologías sobre las que se apalancan nuevos dispositivos y el auge de las redes sociales indujeron cambios drásticos en la forma de comunicación entre las empresas y las personas, lo cual habilitó cambios que han permitido transformar los negocios hacia modelos digitales.
Madurez Digital
Authors: Pernet Carrillo Emir Hernando , Corral Strassmann Maria Mercedes
Published: March 2023

Needed en alianza con Caracol TV y la ANDI lanzaron el primer Informe de Madurez Digital en Colombia (Needed, 2023) con el propósito de dar a conocer las mejores prácticas, reflexiones, e ideas de organizaciones que están más avanzadas en sus procesos de transformación, de tal forma que sean de inspiración e impulso a aquellas que aún no han iniciado o están dando sus primeros pasos. Esta investigación busca identificar los aspectos más relevantes de dicho informe que le permitan al lector conocer los factores claves a tener en cuenta en un proceso de transformación digital organizacional, los temas principales a incluir en una agenda de transformación digital para los próximos años, el estado de madurez digital de las organizaciones colombianas, y los temas de formación y mejores prácticas en los que se debe hacer énfasis para cerrar las brechas de conocimiento más críticas diagnosticadas.
Planejamento para o desenvolvimento na América Latina:
Authors: Bortot Camila Maria , Scaff Elisângela Alves da Silva
Published: March 2023

O texto analisa o processo histórico do planejamento após a Segunda Guerra Mundial na América Latina, com foco nas políticas sociais desenvolvimentistas, no recorte entre 1945-1970. Examina como se organizou uma agenda de ações comuns entre os Estados e Organismos Multilaterais. Tem como projeto principal analisado a Aliança para o Progresso e suas intencionalidades e desdobramentos na região.  Apresenta uma síntese dos aspectos fundamentais das raízes do planejamento na América Latina no recorte histórico delimitado; na segunda trata especificamente do protagonismo da Cepal na materialização de um projeto comum de planejamento que tem como base o desenvolvimento social e econômico para o progresso. Conclui que aceitação generalizada no nível oficial de panejamento como um instrumento para 'promover o desenvolvimento' está intimamente ligada às resoluções da Conferência de Punta Del Leste (1961) e das intencionalidades capitalistas sob influência norte-americana e instrumentalizadas pelas agências da ONU, com destaque a Cepal e seus planejadores. Além disso, a estratégia da política de desenvolvimento social do período possuía duas vertentes que, num primeiro momento, pareciam opostas, mas que eram, verdadeiramente, complementares: a disseminação da lógica desenvolvida da conciliação de conceitos e práticas, da ênfase no desenvolvimento econômico pela área social e a educacional descentralizada.
Palavras-chave: Planejamento na América Latina; Planejamento Educacional; Desenvolvimento social e econômico para o progresso; Organismos Internacionais.
As habilidades linguísticas e a construção do significado nas aulas de inglês no Centro de Estudos de Línguas da Faculdade de Letras da UFAM
Authors: Pinheiro Lucas , Santos Corrêa Edith
Published: March 2023

A presente pesquisa objetivou compreender a importância das habilidades linguísticas, denominadas compreensão auditiva, expressão oral, leitura e escrita, nas aulas de inglês, tendo como território de pesquisa o Centro de Estudos de Línguas (CEL) da Faculdade de Letras da Universidade Federal do Amazonas (FLET-UFAM), a partir do pressuposto de que a ideia de interlocução resulta da construção de um conjunto de práticas de linguagem, em que a língua é o código da interação, é o que faz o uso da comunicação de forma produtiva e receptiva. O projeto norteia-se pelos princípios da abordagem comunicativa, com base nos estudos de Douglas Brown (1994), PennyUr (2006), Jeremy Harmer (2007), Almeida Filho (2008), dentre outros especialistas da linguística aplicada ao ensino e aprendizagem de línguas. Os objetivos específicos foram pautados na análise descritiva da aplicação das habilidades linguísticas no contexto do ensino e aprendizagem de línguas, mapear os parâmetros de integração das quatro habilidades e formular um quadro sobre a aplicação das habilidades linguísticas a partir das atividades desenvolvidas nas aulas de inglês do CEL. A pesquisa é de natureza qualitativa e procedimento metodológico bibliográfico. A coleta de dados foi realizada por meio do instrumento de pesquisa I com professores-estagiários do CEL e os resultados obtidos sugerem que as aulas de inglês do CEL auxiliam a construção da competência comunicativa partindo do pressuposto de que a construção do significado é um produto resultante do processo de integração das quatro habilidades linguísticas.
Palavras-chave: Ensino de línguas; Abordagem comunicativa; Línguas estrangeiras; Habilidades linguísticas; Ensino e aprendizagem.
EDUKASI PENCEGAHAN UNDERWEIGHT PADA IBU BAYI USIA 0 -<6 BULAN
Authors: P O Dwi , Simanungkalit Sintha Fransiske , Sianturi Hendry Roris P , Arini Firlia A , O Yessi Crosita
Published: March 2023

The prevalence of underweight in toddlers 0 – 59 months in Indonesia has increased from 16.3% to 17% based on the 2021 Indonesian Nutrition Status Study (SSGI) data. Underweight is a nutritional problem that is identified using the weight/age indicator (comparing the relative weight of children against age). One of the factors that causes underweight is mother's upbringing, where this can be formed if the knowledge possessed or received by the mother is practiced in daily life. For this reason, serious attention is needed and efforts to prevent underweight as early as possible through mother's knowledge. The purpose of this activity is to increase mothers' knowledge regarding underweight in children aged 0- under 6 months. The method used is to conduct counseling for groups of mothers who have babies aged 0 - <6 months who live in the Pasir Putih sub-district, Depok City, using poster media. The univariate analysis looks at the distribution of the respondent's characteristics, and the bivariate analysis looks at the differences in knowledge before and after the intervention. Based on the results of the analysis with the T-test, there were differences in the knowledge of mothers before and after being given counseling along with giving leaflets with a p value of 0.00. The average pre-test score of 67.7 increased to 92.7. Resulted in a significance value of 0.000 (<0.05) so that it can be concluded that there is a difference in the mother's knowledge score between before and after being given counseling.
PELATIHAN PENGGUNAAN INTERNET SEHAT UNTUK ANAK USIA DINI
Authors: Wulan Sri Ratna , Maspupah Asri , Fauzi Cholid , Rahmani Ani , Bakhrun Akhmad , Min Joe Lian
Published: March 2023

Sejak usia dini, anak-anak zaman sekarang telah diperkenalkan perangkat teknologi informasi untuk mengonsumsi informasi, entertainment dan game yang tersedia di internet. Namun, penggunaan internet tanpa pendampingan dan pengawasaan akan berdampak negatif terhadap perkembangan anak. Misalnya, kejahatan seksual, cyberbullying, kendala kemampuan berbicara, anti-sosial, penurunan kesehatan fisik, dan emosi anak yang mudah meledak. Di sisi lain, penggunaan internet sehat diperlukan agar penggunaan perangkat TI berdampak positif dan menekan dampak negatifnya. Sementara itu, sekelompok guru dan orang tua siswa di Yayasan kelompok bermain (KB) Baiturrahman memiliki pengetahuan penggunaan internet sehat yang rendah. Oleh karena itu, kegiatan pengabdian kepada masyarakat (PkM) melakukan pelatihan penggunaan internet secara sehat yang mencakup pembatasan konten internet, bahayanya mengunggah foto anak ke media sosial, bahaya penggunaan media sosial tanpa pendampingan, dan perlindungan privasi internet. Metode pelatihan menggunakan ceramah, diskusi, dan praktik kemampuan teknis serta pemberian penghargaan kepada peserta yang aktif. Kegiatan PkM meliputi perencanaan, persiapan, pelaksanaan dan evaluasi. Pelatihan dikatakan berhasil ketika terjadi peningkatan pengetahuan peserta dan tingkat kepuasan penyelenggaraan kegiatan. Hasil kegiatan terdiri dari profiling pengetahuan peserta pelatihan terhadap penggunaan internet sehat, modul pelatihan, dan hasil evaluasi pelatihan. Hasil profiling pengetahuan peserta menunjukkan bahwa peserta kurang memahami penanggulangan dampak negatif terhadap penggunaan internet tanpa perlindungan privasi dan pengawasan orang tua. Hasil pelatihan menunjukkan 54,55% peserta mengalami peningkatan pengetahuan dan 75,61 % peserta memberikan indeks kepuasan di atas 80% (Sangat Memuaskan). Dengan adanya kegiatan pengabdian, guru dan orang tua siswa telah menyadari pentingnya edukasi penggunaan internet sehat sejak dini dengan pemberian pembatasan, pengawasan dan pendampingan melalui pemanfaat teknologi informasi.
PENINGKATAN EKONOMI DAN PEMBERDAYAAN MASYARAKAT PAMULANG BARAT MELALUI BUDIDAYA TANAMAN ANGGUR DAN SAYURAN
Authors: Widayani Katri , Puspita Mutiara eka , Vindiana Afina Putri , Aryakusuma Muhammad Isa , Jati Langgeng Prasetyo
Published: March 2023

Adanya penurunan pendapatan masyarakat Pamulang Barat, yang disebabkan adanya pandemi COVID-19 serta pemberlakuan pembatasan kegiatan yang berkesinambungan menyebabkan berkurangnya pendapatan. Dari permasalahan tersebut, maka masyarakat harus mempunyai keahlian dan pengetahuan yang diperlukan agar dapat bertahan. Salah satunya yang dapat dilakukan adalah memanfaatkan lahan tidak produktif sehingga dapat menghasikan sesuatu yang memiliki nilai ekonomis. Salah satunya adalah budidaya anggur. Dari uraian diatas, pengetahuan dan skill yang diperlukan antara lain tentang budidaya anggur, sistem hidroponik, pengetahuan tentang manajemen mutu produk, sistem pemasaran dan keuangan hingga pengetahuan tentang agrowisata dan bagaimana pengelolaannya agar berhasil. Pada permasalahan ini, kegiatan pengabdian masyarakat dibuat sebagai penyaluran pengetahuan dan keterampilan dari dosen dan mahasiswa Institut Teknologi Indonesia kepada masyarakat Pamulang Barat. Pendekatan partisipatif dengan melihat potensi lokal dipilih agar mudah diterima oleh masyarakat. Selain itu pembentukan komunitas juga dipilih agar memudahkan dalam koordinasi dan transfer pengetahuan ke masyarakat. Dari sisi masyarakat, output yang dihasilkan adalah peningkatan pengetahuan, pemberian peralatan Teknologi Tepat Guna yang menunjang budidaya dan manajemen Agrowisata. Tim telah membuatkan logo dan branding agar kampung anggur Pamulang dapat dikenal serta media pemasaran berupa website yang memudahkan masyarakat untuk memasarkan dan melakukan transaksi pembelian. Sedangkan bagi pemerintah, hal ini sesuai dengan visi misi camat pamulang Barat yang ingin menggalakkan anggur sebagai komoditas lokal. Outcome dari kegiatan ini kedepannya dapat berpotensi terjadinya peningkatan potensi pendapatan di masyarakat kampung anggur Pamulang Barat.
BUDIDAYA TANAMAN KANGKUNG DAN IKAN NILA DENGAN SISTEM AKUAPONIK DEEP FLEW TECHNIQUE SEBAGAI KETAHANAN PANGAN DI WILAYAH PERBATASAN REPUBLIK INDONESIA-REPUBLIK DEMOKRATIK TIMOR LESTE
Authors: Andiewati Suci , Oliveira Mathilde Santos , Soares Daniel Candido Da Costa
Published: March 2023

Akuaponik merupakan salah satu alternatif menanam tanaman, memelihara ikan atau penggabungan sistem budidaya aquakultur, hidroponik yang ramah lingkungan yang menjadi solusi untuk mengatasi keterbatasan lahan, keterbatasan sumber air, dan meningkatkan ketahanan pangan. Pada sistem akuaponik ini tanaman kangkung memanfaatkan unsur hara yang berasal dari kotoran ikan nila. Tujuan dari kegiatan ini adalah mengenalkan sistem budidaya akuaponik tanaman kangkung terintegrasi ikan nila pada anggota TNI penjaga keamanan Kota Atambua perbatasan RI-RDTL; 2) Menambah keterampilan ketahanan pangan dengan bercocok tanam kangkung dengan media aquaponik. Kegiatan ini dilakukan di Kabupaten Belu, Provinsi Nusa Tenggara Timur pada bulan februari Tahun 2022. Peserta berjumlah 20 anggota TNI penjaga keamanan Kota Atambua perbatasan RI-RDTL. Metode pelaksanaan kegiatan dengan penyuluhan dan pendampingan budidaya dengan sistem akuaponik deep flew technique. Pada kegiatan ini dihasilkan populasi tanaman organik yang dapat ditanam 10 kali lipat lebih banyak. Dengan aquaponik tanaman dapat ditanam dengan kerapatan tinggi dengan sistem terapung di atas air. Sistem ini mampu menampung hingga 10 kali lipat jumlah tanaman pada luasan yang sama. Kolam yang dihasilkan dari kegiatan ini berukuran 3X4 meter dengan dilakukan penebaran benih bibit nila. Pelaksanaan kegiatan pengabdian kepada masyarakat berjalan lancar dan mendapat respon positif. Hal tersebut dapat dilihat pada saat sesi diskusi dan pendampingan dari anggota TNI penjaga keamanan Kota Atambua perbatasan RI-RDTL sangat antusias mengikuti kegiatan ini. Dengan hasil panen sayur kangkung tersebut dapat dilihat pemahaman dan ketrampilan anggota TNI penjaga keamanan Kota Atambua perbatasan RI-RDTL dalam budidaya tanaman kangkung dan ikan nila dengan sistem aquaponic deep flew technique.
Prediction of Treatment Failure in Hodgkin Lymphoma: A Machine Learning Radiomic Approach in Baseline 18F-FDG PET/CT
Authors: Machado Marcos , Queiroz Cleiton , Pita Jean , Vieira Lucas , Santana Bruno , Namias Mauro , Menezes Vinicius , Salvino Marco , Brandão Simone , Netto Eduardo
Published: March 2023

Purpose: Hodgkin Lymphoma staging and prognostic evaluation through radiomic and machine learning (ML) methods has been little explored. This study explores radiomic features and proposes a new ML radiomic model to predict treatment failure in Hodgkin lymphoma patients from PET images. Methods: 13 radiomic features were extracted from PET images of 51 subjects with Hodgkin’s Lymphoma with response to therapy and 6 subjects with treatment failure as classified by the Lugano criteria for lymphoma response. Univariate analysis was performed for feature selection by means of the areas under ROC curves (AUC), and Pearson correlation was assessed to reduce redundancy in the feature space. A ML algorithm was developed and trained-validated with a six-fold stratified cross validation. The ML performance was assessed through the results of 15 combinations of two-fold validation samples, deriving two ML methods (M1 and M2) for tumor classification at the tumor and patient levels. Results: The features zone percentage (ZP), high intensity large area emphasis (HILAE), entropy and standardized uptake value of maximum pixel (SUVmax) were independent predictors of treatment failure. The ML algorithm performed with AUC=0.86 (M1) and AUC=0.96 (M2) to classify “individual tumors” and at “patient level” performed with sensitivity = 80.0% /specificity = 88.3% (M1) and sensitivity = 100% /specificity = 100% (M2). The ML outperformed the Ann Arbor staging that achieved, respectively, 83.3% and 31.7% for sensitivity and specificity. Conclusions: Evaluation of baseline 18F-FDG PET scans of individuals with Hodgkin’s lymphoma using a ML radiomic model enabled accurate classification of patients at higher risk of treatment failure.
Survey of Invasive Mosquito Surveillance and Control Capacity in Southeastern USA Reveals Training and Resource Needs
Authors: Nguyen Valerie , Weaver-Romero Ana L. , Wang Xiaodi , Tavares Yasmin , BAUER AMELY , McDowell Richard Christos , Dorsainvil Chelsea , Eason Maya D. , Malcolm Ashley N. , Raz Camellia D. , Byrd Brian D. , Riegel Claudia , Clark Marah , Ber Jessica , Harrison Ryan L. , Evans Christopher L. , Zohdy Sarah , Allen Benjamin , Campbell Lindsay P. , Killingsworth Daniel , Grey Elmer W. , Riles Michael T. , Lee Yoosook , Giordano Bryan V.
Published: March 2023

Several invasive mosquito species that are nuisances or of medical and veterinary importance have been introduced into the Southeastern region of the USA, posing a threat to other species and the local ecosystems and/or increasing the risk of pathogen transmission to people, livestock, and domestic pets. Prompt and effective monitoring and control of invasive species is essential to prevent them from spreading and causing harmful effects. However, the capacity for invasive mosquito species surveillance is highly variable among mosquito control programs in the Southeast, depending on a combination of factors such as regional geography and climate, access to resources, and the ability to interact with other programs. To facilitate the development of invasive mosquito surveillance in the region, we, the Mosquito BEACONS (Biodiversity Enhancement and Control of Non-native Species) working group, conducted a survey on the capacities of various public health agencies and pest control agencies engaged in mosquito surveillance and control in seven Southeastern states (Alabama, Florida, Georgia, Louisiana, Mississippi, North Carolina, and South Carolina). Ninety control programs completed the survey, representing an overall response rate of 25.8%. We report key findings from our survey, emphasizing the training and resource needs, and discuss their implications for future invasive mosquito surveillance and control capacity building. By increasing communication and collaboration opportunities (e.g., real-time sharing of collection records, coordinated multistate programs), the establishment of Mosquito BEACONS and the implementation of this survey can accelerate knowledge transfer and improve decision support capacity in response to or in preparation for invasive mosquito surveillance and can establish infrastructure that can be used to inform programs around the world.
Memahami Psikologi Perkembangan Remaja sebagai Upaya Merencanakan Pelayanan Pastoral yang Peka Kesehatan Mental Remaja
Authors: Ruimassa Aleta Apriliana
Published: March 2023

Abstract. Teenage years are a phase in which humans experience significant changes in their physical, psychosocial, and spiritual aspects. If these changes are not addressed wisely and if teenagers also experience external pressures, it will certainly have an impact on mental health. Teenagers are vulnerable to mental health disorders, such as stress and depression, and even attempt to harm themselves to suicide. The Church's concern is to conduct a pastoral service that is contextual and relevant to the struggles of teenagers as members of the congregation to help teenagers' mental health by focusing on their psychological development. A literature study approach was used to analyze data on the urgency of teenage mental health as well as teenage mental health from the perspective of teenage developmental psychology. The study found that a youth-friendly pastoral service is a pastoral action that is sensitive to teenagers’ mental health.Abstrak. Masa remaja adalah sebuah fase kehidupan di mana manusia mengalami perubahan-perubahan yang signifikan dalam dirinya terkait fisik, psiko-sosial, dan spiritual. Jika perubahan-perubahan tersebut tidak disikapi dengan bijak, dan jika remaja juga mengalami tekanan-tekanan di luar dari dirinya, maka tentu akan berdampak pada kesehatan mental. Remaja akan rentan terhadap gangguan kesehatan mental seperti stres, depresi, bahkan upaya menyakiti dirinya sendiri hingga tindakan bunuh diri. Keprihatinan Gereja ialah melakukan suatu pelayanan pastoral yang kontekstual dan relevan bagi pergumulan remaja sebagai anggota jemaat dalam menolong kesehatan mental remaja dengan memperhatikan perkembangan psikologi dari remaja. Pendekatan studi pustaka digunakan untuk menganalisis data mengenai urgensi dari kesehatan mental remaja, dan juga kesehatan mental remaja dari perspektif psikologi perkembangan remaja. Kajian tersebut menemukan  sebuah pelayanan pastoral yang bersahabat kepada remaja menjadi aksi pastoral yang peka akan kesehatan mental remaja.
THE ROLE OF SIGNED LANGUAGE INTERPRETERS IN THE COMMUNICATION AND INTERACTIONS OF COACHES WITH DEAF AND HARD-OF-HEARING ATHLETES
Authors: FIRAT Berrak , OKYAYUZ Şirin , ŞAHİN Mustafa Yaşar
Published: March 2023

In the present study, based on a doctorate thesis, data obtained from practitioners was evaluated to determine the role of CODA sign-language interpreters in Deaf sports. The study includes a multifaceted analysis of the role played by sign language interpreters in the com-munication of hearing national team coaches working with athletes who are deaf in the Turk-ish Deaf Sports Federation (TIESF). For this purpose, semi-structured telephone interviews were conducted with seven experienced CODA interpreters involved in the national and inter-national activities of the TIESF. To date there have been few studies in the field of sports in-terpreting in Turkey, and particularly interpreting for athletes who are deaf. The present research is a pioneering and exemplary study that focuses on the role of signed language interpreters as sports interpreters.
Исследование жаростойкости алитированных покрытий на титане
Authors: Ковтунов А. И. , Хохлов Ю. Ю. , Журавель В. С.
Published: March 2023

Проведены исследования жаростойкости титана с покрытием на основе алюминидов титана, полученных жидкофазным алитированием с последующей высокотемпературной выдержкой. Установлено влияние времени выдержки титановых образцов в алюминиевом расплаве, а также времени последующей высокотемпературной выдержки алитированных образцов на химический и фазовый состав, структуру и жаростойкость покрытий.
Закономерности структурно-фазовых превращений в хладостойкой стали класса прочности 1100 МПа
Authors: Полецков П. П. , Копцева Н. В. , Ефимова Ю. Ю. , Кузнецова А. С. , Алексеев Д. Ю.
Published: March 2023

Исследованы закономерности структурно-фазовых превращений в новой конкурентоспособной стали 25Н2ГСМ для тяжелого и транспортного машиностроения, предназначенной для эксплуатации в экстремальных условиях Крайнего Севера и Арктики. Построена термокинетическая диаграмма распада переохлажденного аустенита. Предложен режим термической обработки, позволяющий получать прокат из стали 25Н2ГСМ класса прочности 1100 МПа с хладостойкостью KCV – 70 = 32 Дж/см2.
Структура, физические и механические свойства алюмоматричных композитов, упрочненных карбидными частицами
Authors: Гладковский С. В. , Петрова С. В. , Черкасова Т. С. , Пацелов А. М.
Published: March 2023

Исследованы физические, механические свойства и микроструктура полученных горячим прессованием алюмоматричных композитов с различным содержанием упрочняющих частиц B4C и SiC. Проведены испытания композитов на сжатие, рентгеноструктурный, металлографический и фрактографический анализы. Определены показатели кажущейся плотности, открытой пористости и микротвердость порошковых материалов. Показано, что наибольшим сопротивлением пластической деформации при сжатии и микротвердостью обладает композит Al + 12,5 % В4С + 12,5 % SiC. При этом высокая дисперсность частиц В4С обеспечивает наибольшую фрагментацию зеренной структуры твердого раствора алюминия.
Релаксационная стойкость аустенитных сталей после различной термической обработки
Authors: Гулиев, А. А. , Шарифова А. В. , Юсубов Ф. Ф.
Published: March 2023

Исследовано влияние термической обработки на релаксационные свойства аустенитных сталей с целью обоснования выбора рациональных режимов, обеспечивающих долговечность шпилек, фланцевых разъемов и других крепежных деталей. Полученные экспериментальные данные показали различную интенсивность процесса релаксации напряжения после различных режимов закалки и отпуска. Предложен наиболее эффективный и экономически обоснованный режим термической обработки исследованных сталей.
Влияние эксплуатационных факторов на усталостное разрушение стальных бурильных труб
Authors: Рублев С. С. , Швецов О. В. , Алфимов А. Д. , Кондратьев С. Ю.
Published: March 2023

Исследовано влияние наработки при эксплуатации, шероховатости поверхности и коррозионной среды на количество циклов до разрушения при испытании на усталость стальных бурильных труб групп прочности S-135 и G-105 различных диаметров. Проведены испытания на многоцикловую усталость по схеме нагружения “изгиб с вращением”, имитирующей условия эксплуатации бурильных труб. Установлено, что снижение сопротивления разрушению в результате наработки труб достигает 20 % за счет накопления внутренних дефектов в процессе эксплуатации. Показано существенное влияние масштабного фактора на предел выносливости сталей, значение которого снижается при увеличении диаметра трубы. Увеличение шероховатости поверхности и действие агрессивной среды значительно снижают циклическую долговечность за счет образования на поверхности труб концентраторов напряжений.
Микроструктурные и электрические характеристики пьезокерамики (Bi0,5Na0,5)TiO3 – ZnO
Authors: Мебрек Алима , Бухезар Скандер , Аззи Афеф , Драй Радуан
Published: March 2023

Исследованы керамические материалы BNT – xZnO системы Bi0,5Na0,5TiO3 – xZnO с 0; 2,0 % (масс.) ZnO, полученные классическим методом твердофазной реакции. Исходные порошки (Bi2O3, TiO2 и Na2CO3 ) в сочетании с добавкой ZnO измельчали в течение 10 ч; прокаливали при 850 °C, 3 ч; прессовали и затем спекали в течение 3 ч при 1050 °C. Морфологию и микроструктуру спеченных гранул исследовали с помощью дифракции рентгеновских лучей, сканирующей электронной микроскопии и гелиевого пикнометра. Установлено образование в материалах твердого раствора (Bi0,5Na0,5)TiO3 со структурой чистого перовскита и шпинели Zn2TiO4. После спекания при 1050 °C пьезокоэффициент d33 для керамики BNT составил 155 пКл/Н, а для BNT с 2,0 масc. % ZnO — 181 пКл/Н. Добавление ZnO в керамику BNT способствует повышению плотности материала и позволяет получить электропроводность 7,48 ґ 108 Ом Ч см.
Effect of zinc concentration on the growth performance of White leg shrimp, Litopenaeus vannamei Boone
Authors: Sharma Khushbu , Gulati Rachna , Bamel Karuna , Sushma
Published: March 2023

Awareness about healthy organic food is increasing, leading to research on contaminants/pollutants and their effect on aquatic fauna and mankind. The effect of zinc sulphate on the growth performance of White leg shrimp, Litopenaeus vannamei (Boone) was evaluated under six doses viz; 0.5, 1, 2, 4, 6, and 8 mg/l in in vitro study conducted from June to October 2021.  The results revealed that higher doses of zinc sulphate showed toxicity against L. vannamei. The weight (3.12gm), length (8.95cm), weight gain per shrimp (4.11g), average daily weight gain (0.032), and specific growth rate (1.1g) were significantly (5%) lower at the higher dose (8mg/l) of zinc sulphate than control 11.73g, 16.22cm, 19.75g, 0.156g, and 2.20g respectively. With an increase in zinc sulphate dose from 0 mg/l in control to 8 mg/l, survival of shrimp decreased from 100 % to 7%. The Lethal concentration (LC50) for zinc sulphate treatments was recorded at 0.71 ppm for shrimp. The water quality parameter pH (7.17-8.09), dissolved oxygen (6.13-7.58mg/l), hardness (4000-4772mg/l), and total alkalinity (162-231mg/l) were in an optimum range. The variation in Nitrite- Nitrogen, Nitrate- Nitrogen and Ammonical-Nitrogen (0-0.018, 0-0.4, 0-0.018mg/l) were within a permissible range. Thus, the present study revealed that zinc had a negative potential effect on L. vannamei at higher concentrations and may lead to serious economic loss to farmers if ignored.
An assessment of seasonal, monthly and diurnal variations of ambient air quality in the Gurugram city (Haryana)
Authors: Bhadauria Neha , Chauhan Abhishek , Ranjan Rajnish , Jindal Tanu
Published: March 2023

Gurugram is emerging as one of India's most advanced cities. The combined impact of industrial and vehicular emissions makes the environment toxic. Recently, Gurugram has experienced severe air quality. In the present work, an assessment of seasonal, monthly, and diurnal variations of ambient air quality was carried out in Gurugram during the period of March 2021 to 2022 February. Seasonal and monthly concentrations of key air pollutants like particulate matter (PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO) and ozone (O3) were examined at Vikas sadan, Gwal Pahari and Teri Gram in Gurugram city to study the most polluted seasons and months. Significantly higher mean concentrations of Particulate matter PM2.5 (406.94 μgm−3) and NO2 (353.96ppb) were seen during the colder months and seasons. O3 showed a consistent trend with variations during the year, with the highest concentration in winter (106.35µg/m3). PM2.5 and NO2 concentrations during the night were greater for all seasons when compared to diurnal values. O3 concentrations displayed diurnal tendencies that were the opposite of those of NO2 concentrations. The highest concentrations of ambient PM2.5, NO2, and CO were observed at the Vikas Sadan Monitoring Station. While the NISE Gwal Pahari station showed greater O3 values. The findings highlight the necessity of efficient air pollution control in Gurugram. To prevent public exposure to air pollutants, preventive measures like green spaces, using public transport, etc. must be adopted. The study contributes to a better understanding of air pollution by seasonal, monthly and diurnal assessment in the city of Gurugram.
A proposed Fuzzy logic model for Electrospun nanofiber pressurised membranes for water treatment- A review
Authors: Rao A.Ganapathi , Kumari V.Pavan , Karnena Manoj Kumar
Published: March 2023

Electrospun nanofiber membranes and nanocomposites for water treatment is an emerging concept growing faster in science, gaining more prominence among various scientists, and creating attention to improve water quality. The familiarity with fabricating these materials is increased, and researchers worldwide target more nanomaterial manufacturing and synthesis for several applications. The electrospinning process for nanofibers' preparation allows polymers to incorporate various functionalized materials. Scientists have recently proposed electrospun membranes using fluorinated compounds and polymers with hydrocarbons. The membranes prepared by the electrospun nanofiber to purify water created a primary research axis, and various laboratory experiments proved efficient. In recent years, the usage of fuzzy analysis in industries has increased, and these logics are applied in every unit process of the water industry. The present review primarily discusses the recent pressurized electrospun membrane technologies utilized in the water industries and machine learning methods that can be applied in the water industries. Further, it suggests a new novel way of integrating options to connect the fuzzy with water treatment to enhance the electrospun nanofiber prospects in the water industry. Implementing these fuzzy models in future by water industries might reduce maintenance costs and help in understanding the characteristics of the effluent quality in detail.
Effect of organic mulches and foliar spray of kaolin on NPK uptake in enhancing yield and economics of dry land maize (Zea mays L.)
Authors: Bhumi Reddy Divya Vani , Ramesh N. , Manimaran S. , Thangavel P.
Published: March 2023

The hot and semi-arid region is prone to meteorological droughts; the lack of rain is frequently accompanied by hot temperatures, strong winds, and low humidity, which has the impact of limiting nutrient uptake and agricultural yields. To overcome this problem a field study conducted during June, 2020 kharif season at farmers field, Chinna Dudyala village, Muddanur, Kadapa district, Andhra Pradesh aimed to determine the effect of organic mulches and foliar spray of kaolin on NPK uptake in enhancing yield and economics of dry land maize (Zea mays). One of the most important techniques for preserving soil moisture was mulching, which also reduces evapotranspiration when anti-transpirants are used. The experiment comprised nine treatments (T1 to T9) with four types of organic mulches viz., Paddy straw, Ground-nut haulm, Coir-pith, and Sugarcane trash, with foliar spray of kaolin intervals on 40 DAS, 20 & 40 DAS and farmers practice to minimize water stress and improve the nutrient uptake by plant. Among the application of the treatments, coir-pith mulch + foliar spray of kaolin @ 3.0% (T6) on 20 DAS & 40 DAS had significant effect on NPK uptake with N (187.15 kg ha-1), P (69.60 kg ha-1) and K (156.22 kg ha-1) and enhanced grain yield (6976 kg ha-1) and stover yield (10980 kg ha-1), highest gross returns (138034 ₹. ha-1) and BCR (2.63) and was superior to all the other treatments. The present study would help to effectively utilise the available resources, enhance growth and productivity in maize crop and to make economically viable to the farmers of semi-arid regions.
Impact of age dominating over the pre-existing comorbidities influencing the D-Dimer levels in SARS-COV-2 infection
Authors: Almatrooshi Ibtisam Obaid , Khan Nelofar Sami
Published: March 2023

COVID-19-related disease severity is more commonly seen in elderly patients with comorbidities, and hypercoagulability has been demonstrated to be involved in the disease progression. This study aimed to evaluate the level of D-Dimer in hospitalized SARS-COV-2 infected patients and to determine the influence of age, gender, Body Mass Index (BMI), and comorbidities on D-dimer value and correlate it with disease severity. This case-control retrospective study retrieved patient data on demographic characteristics, vital functions, comorbidities, disease severity [National Institutes of Health (NIH) classification], and D-dimer from medical records of Thumbay University Hospital, Ajman, United Arab Emirates. SPSS-Version-28 was used for data analysis; a Chi-Square test was done to compare the distribution of comorbidities and disease severity between demographic categories. An independent sample t-test and one-way ANOVA were done to compare mean levels of D-Dimer between two or more categories, respectively. The majority of patients were males, ˃40 years of age, overweight/obese, with 30% having one comorbidity and 20% having ≥2 comorbidities. Among the total, three-quarters had moderate, and one-quarter had severe disease conditions, irrespective of gender or BMI, with an increasing trend of severe cases in the older age group and with comorbidities. Increased D-dimer levels were seen in the majority of SARS-COV-2-infected hospitalized patients, with age as the primary determinant, irrespective of absence or presence of comorbidity, though the trend of higher prevalence of elevated D-dimer value in the multiple comorbid groups and more severe condition was observed. Supporting SAR-COV-2 as a coagulopathic condition, D-dimer concentrations can be a helpful marker of disease progression and can be considered to guide the clinical treatment.
Impact of the orientation of seed placement and depth of its sowing on germination: A review
Authors: Masilamani Poomaruthai , Venkatesan Subramanian , Navamaniraj K. Nelson , Rajarathinam Palanivel , Alagesan Arumugam , Thiagu Krishnasamy
Published: March 2023

Seed orientation and its impacts on germination and seedling establishment mainly depend on the type of germination (hypogeal (or) epigeal), seed size and shape. Higher germination per cent is noticed when seeds are sown in the horizontal position. Planting seeds in a downward position can lead to a variety of physiological, chemical and morphological changes in seedlings. Consequences are usually manifested as noticeable modifications in their development. Vigorous seeds have strong, resilient seedlings due to their well-balanced metabolism and coordinated subcellular activity, making them well-suited for tough environments. Proper plumule and radicle growth require additional hormones and energy to ensure seedling survival. Four necessary factors must be considered while deciding the sowing depth viz., soil moisture, optimum soil temperature, soil aeration and atmospheric humidity required for seed germination, emergence and seedling growth. Variations are observed in germination behaviour and seedling growth for different sowing depths. The necessary factors are very much important for efficient nursery seedlings production. This review looks at the effects of seed depth and orientation on the germination and growth of important agricultural, horticultural and silvicultural crops.
One pot chemical co-precipitation preparation of magnetic graphene oxide-deltamethrin nanoformulations for management of Aedes aegypti
Authors: Gautam Drashya , Samal Roopa Rani , Kumar Sarita , Hooda Sunita , Dheer Neelu
Published: March 2023

Aedes-borne diseases are of worldwide concern due to the lack of effective medicine and vaccination. Frequent use of chemical intervention has developed insecticide resistance in mosquitoes and posed health risks to humans and the environment, necessitating an effective and safer intervention. Graphene Oxide (GO) is an efficient material that can absorb pesticide particles and release pesticide macromolecules in a controlled manner. With the proposition that magnetic graphene oxide (MGO)-based nanoformulations can be an eco-safe and effective material for pesticide conjugation, the present study synthesized these nanoformulations conjugated with a pyrethroid, deltamethrin (DL) through chemical co-precipitation method. The formulations were validated using biophysical techniques and investigated for their efficacy against Aedes aegypti. The X-ray diffraction (XRD) pattern of nanocomposites showed six intense diffraction peaks of Fe3O4 particles, X-ray photoelectron spectroscopy (XPS) displayed the C1s, O1s, and Fe2p photoelectron lines in the MGO nanocomposite's spectra, while Field Emission Scanning Electron Microscopy (FESEM) revealed the small size and uniformity of Fe3O4 nanoparticles on the GO surface. The individual MGO and DL, as well as MGO-DL binary combinations (1:1, 1:2, and 1:3) imparted significant larval toxicity, demonstrating 30%, 50%, and 85% CTC (Co-toxicity coefficient), respectively. High corresponding Synergistic factor (SF) values indicated significant synergism increasing with the rise in deltamethrin proportion. The MGO-DL combinations also increased irritancy and flight response in adults, the notable synergistic effects imparted by the 1:3 combination. The effective actions of MGO-DL nanoformulations against mosquitoes suggest their possible use for mosquito management as a safer and more operative intervention.
Influence of the downwash airflow in Hexacopter Drone on the spray distribution pattern of boom sprayer
Authors: D. Yallappa , Kavitha R. , Surendrakumar A. , Suthakar B. , Kumar A P. Mohan , Kannan Balaji , Kalarani M K
Published: March 2023

The spray characteristics of drone sprayers are significantly influenced by the downwash airflow produced by Drone multi-rotors. The present study aimed to study the influence of downwash airflow and the operational parameters of Drone sprayer, viz., flight height, travel speed, rotor configuration, payload and wind velocity on the spray distribution pattern for boom sprayer attachment to Drone. The boom type sprayer consisted of four numbers of flat fan nozzles placed at three different spacing viz., 30, 45 and 60 cm between each nozzle. The spray distribution pattern of the Hexacopter Drone was studied at three different operating pressures, viz., 3.0, 4.0 and 5.0 kg cm-2. A spray patternator of 5 m x 5 m was developed per the Bureau of Indian Standards (BIS) standard to study the spray uniformity of volume distribution pattern. The best spray uniformity was found as 0.37 % CV value at 60 cm nozzle spacing and 4 kg cm-2 operating pressure. The optimised parameters viz., 60 cm of nozzle spacing and 4 kg cm-2 operating pressure, the influence of downwash airflow on the spray volume distribution of hexacopter Drone with boom spray attachment were studied. The Drone hovered at three different heights, viz., 1.0, 2.0 and 3.0 m from the top of the patternator and spray operating pressure was maintained at 4 kg cm-2. It was observed that less volume of spray was collected at the middle portion when the Unmanned Aerial Vehicle (UAV) was hovered at 1.0 m height due to the direct impact of downwash airflow of rotors. The uniform spray volume distribution pattern was observed when Drone hovered from 1.0 m to 3.0 m height. A round vertex pattern of spray pattern was generated with boom type nozzles configuration due to the direct impact of downwash airflow of rotors. This study will be helpful in the configuration of nozzles attached to the drone sprayers, optimization of spray operational parameters, and revealing spray volume distribution pattern.
Quantum Physics Correction to Relativistic Velocity Addition Formula
Authors: Apell Agona
Published: March 2023

Inspection of the relativistic velocity addition formula reveals a need for a small but consequential correction: the said formula (v_BA=(v_B -v_A )/(1 - (v_A v_B)/c^2 ) or v_BA=(v_B +v_A )/(1 + (v_A v_B)/c^2 ) ) gives different answers for v_A= v_B=c. However, logic suggests that both answers should be the indeterminate v_BA=(0 )/(0 ). Since there was no error in the derivation of the formula within the conceptual framework of The Special Theory of Relativity (STR), the error may only be revealed by deriving the velocity addition formula from a different conceptual framework. Inspired by my belief that STR is in essence a way of accounting for the effects of discrete motion in a framework of continuous motion, I set out in this paper to build a model of discrete motion and use it to re-derive the velocity addition formula. I found that my proposed model of discrete motion leads directly to a velocity addition formula similar to but suggestive of a correction to the corresponding formula in STR. Unlike the formula in STR, the new formula (v_BA=(v_B -v_A )/(1 - (v_A v_B)/c^2 ) or v_BA=(v_B +v_A -(〖 2v〗_A v_B)/c)/(1 - (v_A v_B)/c^2 ) ) gives identical answers for v_A= v_B=c in conformity with logic. To establish the soundness of this model of motion, I used it to derive all the major results of STR, complete with small but consequential corrections and was able to resolve all its paradoxes. A discussion of major results, a conclusion, and recommendation for further research follow the development of the mathematical framework of discrete motion.
Emotional Food Craving Across the Eating Disorder Spectrum – An Ecological Momentary Assessment Study
Authors: Arend Ann-Kathrin , Blechert Jens , Yanagida Takuya , Voderholzer Ulrich , Reichenberger Julia
Published: March 2023

Background. Emotional eating during negative emotions might underlie disordered eating behavior (i.e., binge eating and food restriction). Positive emotions, by contrast, seem to promote healthier eating behavior. Naturalistic research on the links between emotions and eating across individuals with Binge-Eating Disorder (BED), Bulimia Nervosa (BN), binge-purge Anorexia Nervosa (AN-BP), and restrictive Anorexia Nervosa (AN-R) is, however, lacking. Methods. Individuals without eating disorders (comparison group, CG, n=58), and patients with BED (n=41), BN (n=50), AN-BP (n=26), and AN-R (n=29) participated in an ecological momentary assessment study. Six daily notifications over eight days prompted ratings of momentary food craving and emotional states differing in valence and arousal. Results. Results supported specific emotion-food-craving patterns in each group. Compared to the CG, arousing negative emotions and higher cravings co-occurred in patients with BN. In patients with AN-BP (at trend level also in patients with AN-R) less arousing negative emotions and lower cravings co-occurred. In patients with AN, positive emotions and higher cravings co-occurred whereas in patients with BED less arousing positive emotions and lower cravings co-occurred. Conclusion. The found emotion-craving associations may underly group-specific (dys-) functional eating behaviors, i.e., binge eating and food restriction during negative emotions in patients with BN and AN, and normalized appetitive responses during positive emotions in patients with BED and AN. Therapeutic efforts could target arousing negative emotions in patients with BN, and less arousing negative emotions in patients with AN. Positive emotions could be used in a salutogenetic approach in patients with BED and AN.