bluuebunny/crossref_metadata_2025 huggingface dataset:
Enhancing vibration control in stay cables: a modified damping formulation with NS-HDR damper
Authors: Luu Xuan Le , Hiroshi Katsuchi , Binh Xuan Luong , Linh Ngoc Vu , Quan Van Ha
Published: January 2024

Cables in cable-stayed bridges have low intrinsic damping, and dampers are often used as a countermeasure for cable vibration control. This paper presents an innovative asymptotic formula for calculating the additional damping in stay cables equipped with Negative Stiffness High Damping Rubber dampers (NS-HDR). The NS-HDR damper incorporates negative stiffness through a pre-compressed spring. The analysis employs models of flexural cables with fixed-fixed or hinged-hinged ends to derive the formulation of attainable damping ratio. The results of the study reveal that the NS-HDR damper, with its negative stiffness feature, exhibits a significantly higher added damping ratio in comparison to the conventional HDR damper configuration. To quantify this increased added damping resulting from negative stiffness, a modification factor is proposed. The accuracy and effectiveness of the proposed damping formula are successfully validated using the Finite Difference Method (FDM). Subsequently, the methodology is applied to design the damping of two existing stay cables (137.82m and 167.18m in length). Field measurements reveal that the damping in these cables falls below the required threshold of 0.5%. The proposed NS-HDR damper offers a viable solution to achieve the required damping ratio. These findings contribute significantly to the understanding and optimization of damping in stay cables employing HDR dampers, presenting potential applications in the field of bridge engineering. The research opens up new possibilities for enhancing vibration control and safety in cable-stayed bridges.
Work-Life Balance and Service Delivery
Authors: Ndua Esther Wambui , Wanyoike Rosemary
Published: January 2024

Purpose: Police officers in Kenya face a wide array of stressors in the line of duty, including exposure to high levels of crime, violence, and the ever-present threat of traumatic incidents. Inadequate resources, long working hours, and the burden of meeting performance targets further contribute to elevated stress levels among officers. This study aimed to determine the effect of Work-Life Balance on service delivery at National Police Service in Nairobi City County, Kenya. The study was grounded based on Servqual model.

Methodology: The study adopted desk review of empirical literature. Target population was National police officers working in Nairobi City County. The findings were derived from reviewed empirical literature.

Results: The findings show that Work-Life Balance impacted the service delivery. The inspector general of police should work closely with inspectors for regularly assess the workload.

Unique contribution to theory, practice and policy:  The inspectors should conduct regular assessments of workload and staffing levels to ensure they are balanced and manageable.
ЭКСПЕРИМЕНТАЛЬНЫЕ ИССЛЕДОВАНИЯ ПРОЦЕССА ГИДРОАБРАЗИВНОЙ РЕЗКИ
Authors: Г. М. Базенов  , Г. Т. Итыбаева  , Ж. К. Мусина  , С. И. Деревягин  , А. Л. Галиновский
Published: January 2024

В статье показано, каким образом подача при гидроабразивной резке влияет на шероховатость поверхности реза. Резание выполняется смесью воды и абразива, испускаемых из сопла с высокой скоростью и под высоким давлением. Под действием режущей струи происходит эрозионное разрушение материала, частицы абразива снимают слой микростружки, а вода эвакуирует их из зоны резания. Методом гидроабразивной резки можно обрабатывать практически любые материалы. Процесс резки – «холодный», отсутствует термическое воздействие на металл. Возможна резка сложной геометрии. Анализ показал отсутствие зависимостей для прогнозирования шероховатости поверхности реза от основных технологических параметров обработки (давление струи, зернистость, размер, расход абразива, физико - механические параметры материала и т д). Технолог на производстве сталкивается с трудностью определения не только шероховатости поверхности реза, но и размеров зоны гладкого и волнистого реза. Отсутствие адекватных теоретических моделей формирования профиля шероховатости не позволяет выполнять оптимизацию процесса резки, с учетом требований заданной шероховатости. Возможность оптимизации процесса резки по заданному значению шероховатости делает возможность практического применения при разработке технологических процессов. В результате исследований установлено, что шероховатость обработанной поверхности ухудшается с увеличением подачи. При этом ухудшение неравномерно распределено вдоль сечения реза. Для уменьшения ширины волнистого реза необходимо уменьшать значение подачи. Ключевые слова: гидроабразивная резка, качество поверхности, режимы резания, подача, сопло, режущая головка, расход абразива, эрозионное разрушение металла.
CAST HOLLOW BILLET STRUCTURE SIMULATION MODELING FOR OIL GRADE PIPES
Authors: А. Т. Zhakupova  , А. N. Zhakupov
Published: January 2024

Simulation modeling of hollow billet casting processes for the production of seamless oil grade pipes was performed. The aim of the work was to study the influence of geometric shape on the quality and properties of a continuously cast pipe billet. Modeling parameters, initial and boundary conditions were selected taking into account the conditions of the current production. The object of the study was a pipe billet with a diameter of 210 mm. When modeling the process of casting and solidification of billets, low-alloy structural chromium-molybdenum steel was used. For the simulation processes, three-dimensional models of billets were created, as well as models of shapes. Several factors were taken into account when modeling continuous casting and crystallization of a hollow billet: casting speed, chemical composition of the alloy being poured; casting temperature; geometric dimensions of the billet section. Modeling of hollow billet casting in the «LVM Flow» software package predicted the non-shrinking structure formation a decrease in microporosity (more than 0.85 according to the Niyama criterion) of the billet. As a result of simulation modeling, the improvement of the structure is theoretically confirmed when using a hollow steel billet as a starting point for the production of seamless hot-rolled pipes. There were no signs of shrinkage and microporosity on the hollow billet exceeding the permissible value according to the Niyama criterion. Keywords: hollow billet, steel, modeling, pipe, 25CrMoV.
ТЕОРЕТИЧЕСКИЕ РАСЧЕТЫ И ПОСТРОЕНИЕ ФАЗОВЫХ ДИАГРАММ МНОГОКОМПОНЕНТНОЙ СИСТЕМЫ Ti-Al-Mo-V-Zr
Authors: А. Ж. Терликбаева  , А. М. Алимжанова  , Р. А. Шаяхметова  , А. А. Мухаметжанова  , Б. Т. Сахова
Published: January 2024

В данной работе были проведены расчеты изотермических и политермических расчетов системы Ti-2,5Al-5Mo-5V с добавлением различных масс.% Zr с помощью программы Thermo-Calc Perpetual SUNLL 2023a с использованием базы данных TCS Ti-and TiAl Alloys Datebase, Perpetual DSUNLL 5. Расчетным путем определены показатели изменения фазового состава сплава системы Ti-Al-Mo-V-Zr в зависимости от условия охлаждения и состава. Введение циркония в титановый сплав системы Ti-2,5Al-5Mo-5V в количестве 1 % приводит к значительному изменению фазового состава. Установлено, что легированные небольшим количеством циркония титановые сплавы являются двухфазными, и в связи с этим увеличивать содержание циркония выше 1 % нерационально. Политермическими расчетами определен оптимальный состав титанового сплава, масс. %: 2,5 Al, 5 Mo, 5 V, 1Zr, остальное титан. Установлено, что в диапазоне температур 660-700 °С происходит равное распределение количества α и β фаз. Для того чтобы зафиксировать необходимую двойную α + β область необходимо провести дополнительную термическую обработку сплава при 660–700 °С, а процесс дальнейшей прокатки сплава в листы дает возможность получить ультрамелкозернистую структуру, благодаря которой достигаются повышенные прочностные, пластичные и усталостные свойства. Ключевые слова: Ультрамелкозернистость, интенсивная пластическая деформация, структура, наноразмеры, сверхпластичность.
НАТРИЙ ХЛОРИДІНІҢ ДИНАМИКАЛЫҚ ТҰТҚЫРЛЫҒЫНЫҢ ТЕМПЕРАТУРАҒА ТӘУЕЛДІЛІГІНІҢ КЛАСТЕРЛІ-АССОЦИАТТЫҚ МОДЕЛІ
Authors: Л. А. Бекбаева  , А. М. Макашева
Published: January 2024

Мақалада авторлар күрделі бейорганикалық зат - натрий хлориді тұтқырлығының температураға тәуелділігін алды және ұсынылған математикалық модельді тексерді. Тұтқырлық сұйықтықтың қозғалыста және тыныштықта болатын хаосқа сезімтал қасиеті ретінде қарастырылады. Тұтқырлықтың математикалық моделі Больцманның таралуы мен ретсіз қозғалатын бөлшектер тұжырымдамасын қолдану арқылы жасалды. Осы негізде тұтқырлықтың иерархиялық кластерлі-ассоциаттық моделі құрылды, ол тек бастапқы кластерлердің түзілуін ғана емес, сонымен қатар кластерлердің ассоциациялану дәрежесін анықтау мүмкіндігімен оларға қатысы бойынша екінші ретті ассоциаттарды да ескереді. Кластерлі-ассоциаттық модельді эксперименттік деректерге бейімдеу үшін модельдің белгісіз параметрлерін анықтау үшін деректерді өңдеудің белгілі бір әдістері жасалды. Тұтқырлық бойынша деректерді өңдеу әдісі барлық жиынтық ішінен тек үш негізгі нүктелерді қолдана отырып, ассоциаттардың агрегация дәрежесі көрсеткішін анықтауға мүмкіндік береді. Натрий хлоридінің тұтқырлығы бойынша деректерді өңдеу кезінде анықтамалық шамалармен есептелген шамаларды салыстырғанда корреляцияның жоғары коэффициенті анықталды, бұл жаңа тәуелділіктің адекваттылығын, барабарлығын көрсетеді. Берілген модель натрий хлориді тұтқырлығының әрекетін әлдеқайда жоғары температуралар аймағында болжауға мүмкіндік береді. Тұтастай тұтқырлыққа және ассоциаттардың бұзылу динамикасына сәйкес, температураның жоғарылауымен кластерлердің ассоциация дәрежесі төмендейді. Кілтті сөздер: Больцманның таралуы, динамикалық тұтқырлық, хаотикалық бөлшектер, ассоциат, кластер, натрий хлориді.
ИССЛЕДОВАНИЕ ЗАВИСИМОСТИ ПРОЧНОСТНЫХ СВОЙСТВ ДЛИННОМЕРНЫХ СТАНИН МРС ОТ СОСТАВА ПОЛИМЕРБЕТОННЫХ СМЕСЕЙ
Authors: А. С. Берг  , А. А. Берг  , В. В. Юрченко
Published: January 2024

В данной статье представлен анализ различных составов полимербетона. Рассмотрены достоинства и недостатки полимербетона, применяемого для проектирования длинномерных металлорежущих станков (МРС). Были исследованы шесть заполнителей (базальт, сподумен, летучая зола, речной гравий, песок и мел). Образцы полимербетона были приготовлены с различными составами заполнителей, содержащих одинаковую объемную долю смолы (заполнители 83% и смола 17%). Для измерения прочности образцов полимербетона на изгиб был использован четырехточечный тест на изгиб. КТР полимербетона был измерен с помощью специально изготовленного устройства. Был рассмотрен оптимальный состав позволил снизить вариации деформации оснований до достаточно низкого уровня, что способствует дальнейшему повышению точности станков с прецизионным инструментом. Это улучшение условий эксплуатации для прецизионной обработки инструмента ускоряет уровень точности до более высокого пика при получении точных изделий. Были проведены численные исследования динамических свойств и анализ статических прочностных свойств двух корпусов станка. Во время теоретических исследований метод конечных элементов использовался для анализа гибридного корпуса, состоящего из двух материалов. Это представляет собой некоторое упрощение, поскольку модель контакта чугуна и полимербетона требует экспериментальной идентификации. Такая идентификация охватывала свойства конструкционных материалов. Ключевые слова: полимерный материал, полимербетон, металлорежущий станок, состав полимербетона, прочность на изгиб, коэффициент теплового расширения.
SITUAÇÃO DE USO E OCUPAÇÃO DO SOLO NAS ÁREAS DE PRESERVAÇÃO PERMANENTE NA ZONA URBANA DE IPIAÚ, ESTADO DA BAHIA, BRASIL
Authors: SARAH ANDRADE SAMPAIO  , SIRIUS OLIVEIRA SOUZA  , REGINA CÉLIA DE OLIVEIRA
Published: January 2024

A zona urbana de Ipiaú desenvolveu-se nas planícies e terraços fluviais dos rios de Contas e Água Branca e, tem ocupado, paulatinamente, topos de morros e encostas com declividade acentuada, definidas como Áreas de Preservação Permanente. Diante desse cenário, o objetivo desse trabalho é compreender tipos de uso e ocupação na zona urbana, suas alterações ambientais e implicações legais, utilizando-se de técnicas de geoprocessamento. Foi elaborado o Mapa de Uso e Ocupação do Solo Intraurbano, em escala de 1:25.000, a partir de imagens do satélite CBERS 04A, cuja metodologia é baseada em trabalhos de Kuinchtner, Camponogara e Franco-Trevisan (2004) e Franco et al. (2011), e delimitadas as categorias de adequações de APPs conforme proposto por Campos e Matias (2012). Entre os resultados, destaca-se que, apesar do município possuir um Plano Diretor, houve a redução drástica dos ambientes florestados e um aumento expressivo áreas impermeabilizadas para ampliação de novos loteamentos em APPs de topos de morros e de canais fluviais. Tais aspectos potencializam o efeito dos processos erosivos nas vertentes, tendo como consequências diretas o assoreamento dos canais fluviais, maiores riscos associados a enchentes e inundações, além da maior frequência de alagamentos nas áreas centrais.
Efeito da osteopatia nas patologias respiratórias: revisão sistemática
Authors: Ferreira David , Costa Mariana , Couto Miguel , Barreira Rafaela , Pereira Sara , Campelo Natália , Sousa Helena
Published: January 2024

Introdução: As principais causas respiratórias de doença severa e morte a nível mundial são o cancro no pulmão, na traqueia e nos brônquios, a tuberculose, a doença pulmonar obstrutiva crónica (DPOC), a asma e a pneumonia, as quais são maioritariamente tratadas com a intervenção farmacológica. O tratamento manipulativo osteopático (TMO) tem vindo a ser relacionado com a melhoria da biomecânica da caixa torácica (Lago et al., 2015). Objetivo: Sistematizar a evidência disponível para determinar, mediante uma análise qualitativa da metodologia, os efeitos da intervenção osteopática na sintomatologia e qualidade de vida de indivíduos com patologias respiratórias, incluindo asma, DPOC, pneumonia, cancro da traqueia, pulmão e brônquios, além da tuberculose. Métodos: Procedeu-se a uma pesquisa sistemática na base de dados Pubmed a 30 de abril de 2022 e, com base nos critérios de inclusão e elegibilidade, selecionaram-se estudos experimentais randomizados e controlados. A análise dos artigos, recolha de dados e avaliação da qualidade metodológica, com recurso à Cochrane Risk of Bias Tool, foram realizadas por dois revisores independentes, intervindo um terceiro em caso de discordância (Donato & Donato, 2019). Resultados: Identificaram-se vinte e quatro ensaios clínicos randomizados (RCT), dos quais oito foram incluídos. Em relação à asma (Jones et al., 2021), verificaram-se melhorias estatisticamente significativas apenas num dos três artigos apurados. Nos três artigos relativos à DPOC, os investigadores verificaram melhorias significativas, porém, apenas em alguns dos parâmetros avaliados. Nos dois artigos referentes à pneumonia não se verificaram melhorias estatisticamente significativas. Os artigos apresentavam uma qualidade metodológica com alguns riscos de viés altos ou incertos. Conclusão: Pelas evidências estatisticamente significativas, parece indicar eficácia no uso de TMO na melhoria da sintomatologia e qualidade de vida de indivíduos com asma, DPOC e pneumonia. A qualidade metodológica dos estudos é limitada, pelo que não se pode assumir que a utilização da intervenção com recurso à TMO é eficaz na melhoria destas condições.
Looking Back to Move Forward
Authors: Roschelle Jeremy , Schellinger Adam
Published: January 2024

SEERNet digital learning platforms (DLPs) are developing new infrastructure to support research in authentic contexts where student learning is happening. In order to contextualize this work within the larger field, we trace historical precedents along four main categories: data repositories, data collection services, research design interfaces, and research communities. By situating this innovative movement alongside its predecessors, we can identify the opportunities for SEERNet and others to progress and sustain the mission of making research more scalable, equitable, and rigorous.
COUNSELLING AS A TOOL FOR OVERCOMING BARRIERS IN STEM EDUCATION AMONG UNDERREPRESENTED GROUPS
Authors: Nancy Mohd Al Hamad  , Ololade Elizabeth Adewusi  , Chika Chioma Unachukwu  , Blessing Osawaru  , Onyebuchi Nneamaka Chisom
Published: January 2024

This research explores the pivotal role of counselling in overcoming barriers faced by underrepresented groups in Science, Technology, Engineering, and Mathematics (STEM) education. Recognizing the multifaceted challenges, we delve into the historical context, prevalent barriers, and existing gaps in the literature, emphasizing the importance of addressing academic, socioemotional, and systemic factors. A comprehensive review of counselling models and approaches reveals a diverse toolkit that provides tailored support for individuals navigating STEM education. The benefits of counselling extend beyond academic achievement to encompass emotional well-being, career development, and the creation of inclusive STEM communities. By examining policy implications, including institutional commitments, curricular integration, and cultural competence, we propose actionable steps to foster a supportive environment within STEM education. We envision integrating technology, data-driven strategies, and holistic wellness programs as promising directions toward the future. Community engagement, advocacy for policy changes, and a commitment to lifelong learning underscore the collaborative efforts required to shape a more equitable and empowering STEM education landscape. In conclusion, counselling in STEM education emerges as a transformative tool, offering a pathway toward inclusivity, resilience, and success. Through ongoing research, innovation, and a commitment to cultural competence, we strive to create a future where counselling becomes an integral part of the educational journey, unlocking the full potential of every aspiring STEM professional, irrespective of their background or identity.

Keywords: STEM Education, Underrepresented Groups, Counselling Models, Inclusivity, Academic Barriers
BLOCKCHAIN IN SUPPLY CHAIN MANAGEMENT: A SYSTEMATIC REVIEW: EVALUATING THE IMPLEMENTATION, CHALLENGES, AND FUTURE PROSPECTS OF BLOCKCHAIN TECHNOLOGY IN SUPPLY CHAINS
Authors: Osato Itohan Oriekhoe  , Ganiyu Bolawale Omotoye  , Oluwaseun  Peter Oyeyemi  , Sunday Tubokirifuruar Tula  , Andrew Ifesinachi Daraojimba  , Adedayo Adefemi
Published: January 2024

This study presents a comprehensive analysis of the implementation, challenges, and future prospects of blockchain technology in supply chain management (SCM). Amidst the evolving landscape of global supply chains, the integration of blockchain technology has emerged as a pivotal innovation, offering transformative potential in enhancing transparency, efficiency, and security. The advent of blockchain technology has revolutionized traditional supply chain systems, introducing new paradigms of operation and management. This study explores the historical evolution of SCM systems and the comparative effectiveness of blockchain-based models against traditional systems. The primary aim is to systematically review and synthesize current research on blockchain in SCM, focusing on its implementation, inherent challenges, and future development prospects. The paper delves into various aspects of blockchain in SCM, including its current state of implementation across industries, the challenges and solutions in adoption, comparative performance analysis with non-blockchain systems, emerging trends, stakeholder perspectives, and geographical variations in adoption. Strategic implications for businesses, pathways for effective implementation, and policy recommendations are also thoroughly examined.The study identifies blockchain's significant impact on enhancing supply chain transparency and efficiency. Key challenges include technological barriers, regulatory uncertainties, and the need for stakeholder collaboration. The research highlights the strategic advantage of blockchain in supply chains, particularly in terms of cost reduction, operational effectiveness, and environmental sustainability. The study concludes with a call for a multi-faceted approach to blockchain integration in SCM, emphasizing collaborative efforts, educational advancements, infrastructural support, and policy development. Recommendations are geared towards leveraging blockchain's potential for competitive advantage and sustainable supply chain practices.

Keywords: Blockchain, Supply Chain Management, Technology Adoption, Strategic Implications, Innovation, Sustainability.
Rancang Bangun Alat Pengering Gabah Berbasis Arduino Uno
Authors: Kusumawardani Dyah , Izzuddin Ahmad , Hikmah Nuzul , Sunyoto Andrik
Published: January 2024

Salah satu kendala yang dihadapi petani dalam pasca panen padi adalah proses pengeringan. Selama ini, pengeringan gabah secara tradisional dilakukan di bawah sinar matahari. Secara tradisional proses pengeringan mengalami kendala pada saat musim hujan yaitu kurangnya sinar matahari. Pada permasalahan tersebut penulis membuat alat pengering gabah yang diharapkan dapat membantu mengatasi permasalahan pada proses pengeringan gabah. Sistem ini menggunakan Arduino Uno R3 untuk mengontrol suhu, kelembaban dan menggunakan heater, blower dan motor DC. Sistem ini bekerja dengan cara menerima data suhu dan kelembaban dari sensor DHT22. Data dari sensor ini digunakan sebagai parameter untuk menggerakkan aktuator heater, blower, dan stirrer. LCD kemudian menampilkan data tersebut sebagai informasi kondisi kelembaban dan suhu pada ruang pengering. Sehingga diharapkan alat pengering gabah ini dapat diterapkan di kehidupan nyata untuk membantu petani dalam proses pengeringan gabah terutama pada saat musim hujan.
Analisis Biaya Standar Sebagai Alat Pengedalian Biaya Produksi Pada CV. Pia Manalagi Probolinggo
Authors: Rahman Anita , Elly Mohammad Iskak , Koeshardjono R Hery
Published: January 2024

Penelitian ini punya tujuan untuk mencaritahu analisis biaya standar sebagai alat pengendalian biaya pengolahan di CV. Pia Manalagi Probolinggo. Metode penelitian yang dipakai yakni deskriptif kuantitatif. Sumber data didalam penelitian ini yakni data sekunder dengan mengenakan teknik tanya jawab serta dokumentasi. Analisis data yang dipakai yakni analisis perbandingan (varians). Hasil penelitian menampakkan jika perbandingan biaya pengolahan yang terjadi di CV. Pia Manalagi Probolinggo yakni perbandingan biaya bahan baku tahun 2021 serta 2022 mengalami perbandingan tidak menguntungkan (Unfavorable/UF), perbandingan biaya tenaga kerja langsung tahun 2021 serta 2022 tidak ada selisih, serta perbandingan BOP tahun 2021 mengalami perbandingan tidak menguntungkan (Unfavorable/UF) serta tahun 2022 mengalami perbandingan menguntungkan (Favorable/F).
PENGGUNAAN METODE PROBLEM BASED LEARNING UNTUK MENINGKATKAN HASIL BELAJAR PESERTA DIDIK PADA PEMBELAJARAN MATEMATIKA KELAS VIII DI SMPN 1 KETUNGAU HULU
Authors: YOPPIYANA AGNES
Published: January 2024

The low student mathematics learning outcomes are caused by less innovative learning media and a lack of connection between learning material and real life contexts. Based on this, research was conducted which aimed to improve the mathematics learning outcomes of class VIII students after implementing the problem based learning model. This research is classroom action research carried out in two cycles. Each cycle has four stages, namely: planning, implementation, observation and reflection. The subjects of this research were 21 class VIIIa students, consisting of 11 men and 10 women. The object of the research is students' mathematics learning outcomes, data analyzed using descriptive statistics. The research results show that the problem basic learning model can improve mathematics learning outcomes for class VIIIa. This is known from the pre-cycle student learning results with an average result of 71.09 and learning completeness of 30% in the low category. In cycle one, the average score was 75.20 and learning completeness was 54%, which was in the sufficient category. The research continued in cycle II and obtained an average score of 82.11 and learning completeness of 95% which was in the high category and had met the success indicator criteria. So, it can be concluded that the application of the problem based learning model can improve student learning outcomes.
ABSTRAKRendahnya hasil belajar matematika siswa disebabkan oleh media pembelajaran yang kurang inovatif dan kurangnya keterkaitan antara materi pembelajaran dan kontek kehidupan nyata. Berdasarkan hal tersebut, maka diadakan penelitian yang bertujuan untuk meningkatkan hasil belajar matematika siswa kelas VIII setelah penerapan model  pembelajaran problem based learning. Penelitian ini merupakan penelitian tindakan kelas yang dilaksanakan dalam dua siklus. Setiap siklus memiliki empat tahapan yaitu : perencanaan, pelaksanaan, observasi dan repleksi. Subjek penelitian ini adalah siswa kelas VIIIa yang berjumlah 21 orang, terdiri atas 11 laki – laki dan 10 perempuan. Objek penelitian adalah hasil belajar matematika siswa data dianalisis menggunakan statistic deskripsiptif. Hasil penelitian menunjukan bahwa model pembelajaran problem basic learning dapat meningkatkan hasil belajar matematika kelas VIIIa. Hal ini diketahui dari hasil belajar siswa pra siklus dengan hasil rata rata 71,09 dan ketuntasan belajar 30% beada pada kategori rendah. Pada siklus satu dengan nilai rata rata 75,20 dan ketuntasan belajar 54 % yang berada pada kategori cukup. Penelitian dilanjutkan pada siklus II dan memperoleh nilai rata rata 82,11 serta ketuntasan belajar 95 % yang berada pada kategori tinggi dan sudah memenuhi kriteria indicator keberhasilan. Jadi, dapat disimpulkan bahwa penerapan model pembelajaran problem based learning dapat meningkatkan hasil belajar siswa.
Échange de clé authentifié par mot de passe : protocoles et modèles de sécurité
Authors: JARECKI Stanislaw
Published: January 2024

Afin d’authentifier son interlocuteur lors d’un échange de clé, plusieurs méthodes sont possibles, de la clé symétrique long-terme à la clé publique. Mais la plus pratique est l’utilisation d’un mot de passe commun. Néanmoins, la sécurité devient délicate à définir et à garantir. Ce chapitre présente tout cela en détails.
Calcul multi-parties sécurisé
Authors: LINDELL Yehuda
Published: January 2024

Le calcul multi-parties permet à plusieurs personnes de calculer conjointement une fonction sur leurs entrées secrètes, en ne révélant à chacun que les sorties. Plusieurs notions de sécurité sont présentées, avec différents niveaux d’exigences. Bien qu’à priori théorique, ce type de protocole est ensuite illustré par plusieurs cas d’usage concrets.
Cryptographie à base de couplages
Authors: BLAZY Olivier
Published: January 2024

Après s’être illustrés en cryptanalyse, pour attaquer le problème du logarithme discret sur courbes elliptiques, les couplages se sont également révélés précieux pour construire des mécanismes cryptographiques jusqu’alors inaccessibles. La théorie mathématique est présentée, avec quelques schémas cryptographiques concrets.
Échange de clé
Authors: BOYD Colin
Published: January 2024

La première instanciation concrète de la cryptographie asymétrique est le protocole d’échange de clé Diffie-Hellman, qui permet à deux individus d’établir une clé secrète commune via un canal de communication public. Cela permet ensuite l’usage de cryptographie symétrique à ce secret commun. Ce chapitre formalise cette primitive, avec plusieurs exemples.
Déformation tardi-orogénique et réorganisation structurale de la chaîne varisque au Carbonifère supérieur
Authors: DENÈLE Yoann , COCHELIN Bryan
Published: January 2024

L’intégration des marqueurs structuraux tardifs de la chaîne varisque (320-300 Ma) souligne une restructuration orogénique majeure affectant une lithosphère faible. La formation de l’arc ibéro-armoricain encadré par des décrochements ductiles, s’accompagne d’un transfert de matière par fluage de la croûte inférieure orogénique. Ce transfert est dirigé de la chaîne en cours de démantèlement vers la subduction supposée de la Paléotéthys.
Bassins sédimentaires et évolution du relief associés au cycle varisque en France et dans les pays limitrophes
Authors: ARETZ Markus , NARDIN Élise , CHRISTOPHOUL Frédéric , DENAYER Julien
Published: January 2024

Les bassins sédimentaires sont les témoins incontournables de l’évolution spatio-temporelle de la chaîne varisque. Au Dévonien terminal les marges passives laissent la place aux bassins d’avant-pays qui sont suivis par les bassins paraliques pendant le Carbonifère. Le remplissage et faciès sédimentaires enregistrent l’évolution des prismes orogéniques. L’effondrement gravitaire de la chaîne s’enregistre finalement dans les bassins stéphaniens.
Détournement de l’outil : une transformation de la représentation architecturale
Authors: BERNIER-LAVIGNE Samuel
Published: January 2024

Ce chapitre aborde la transformation de la représentation architecturale à l’ère numérique, sous l’angle du détournement de l’outil. Après une réflexion sur les concepts clés, l’étude se porte sur l’influence du détournement du logiciel, puis de la machine, comme moyen d’explorer de nouveaux potentiels liés au dessin et à l’image architecturale.
Vulnérabilités plurielles : approches en sciences humaines et sociales
Authors: BECERRA Sylvia , PELTIER Anne
Published: January 2024

Une grande variété de concepts et de problématiques sont mobilisés par les sciences sociales pour approcher la vulnérabilité. L’émergence des concepts de résilience ou adaptation traduit des postures différentes. Le développement dans des recherches interdisciplinaires de notions comme souffrance environnementale ou zones de sacrifice témoigne de l’exacerbation de la vulnérabilité et de sa difficile réduction opérationnelle.
De la vulnérabilité sanitaire des territoires à la réduction des inégalités de santé
Authors: VAILLANT Zoé , RICAN Stéphane
Published: January 2024

Cerner la géographie des vulnérabilités sanitaires revient à resituer les déterminants de la santé dans toute l’épaisseur des territoires (contextes politiques et économiques, configurations socio-urbanistiques, jeux d’acteurs, constructions locales des risques etc.). C’est dans ce sens qu’il devient possible d’agir sur les inégalités sociales et territoriales de santé.
À quoi servent les cartes de vulnérabilité ?
Authors: RUFAT Samuel , PIGEON Patrick
Published: January 2024

Ce chapitre identifie les objectifs des cartes de vulnérabilité, en France ou à l’international. L’opérationnalisation du concept cherche à légitimer et à suivre les effets des politiques publiques. Des choix théoriques et politiques sous-tendent la production des cartes comme leurs effets concrets sur les territoires.
Sensitivity of the polar boundary layer to transient phenomena
Authors: Kaiser Amandine , Vercauteren Nikki , Krumscheid Sebastian
Published: January 2024

Abstract. Numerical weather prediction and climate models encounter challenges in accurately representing flow regimes in the stably stratified atmospheric boundary layer and the transitions between them, leading to an inadequate depiction of regime occupation statistics. As a consequence, existing models exhibit significant biases in near-surface temperatures at high latitudes. To explore inherent uncertainties in modeling regime transitions, the response of the near-surface temperature inversion to transient small-scale phenomena is analyzed based on a stochastic modeling approach. A sensitivity analysis is conducted by augmenting a conceptual model for near-surface temperature inversions with randomizations that account for different types of model uncertainty. The stochastic conceptual model serves as a tool to systematically investigate which types of unsteady flow features may trigger abrupt transitions in the mean boundary layer state. The findings show that the incorporation of enhanced mixing, a common practice in numerical weather prediction models, blurs the two regime characteristic of the stably stratified atmospheric boundary layer. Simulating intermittent turbulence is shown to provide a potential workaround for this issue. Including key uncertainty in models could lead to a better statistical representation of the regimes in long-term climate simulation. This would help to improve our understanding and the forecasting of climate change in high-latitude regions.
Warm conveyor belt activity over the Pacific: modulation by the Madden–Julian Oscillation and impact on tropical–extratropical teleconnections
Authors: Quinting Julian F. , Grams Christian M. , Chang Edmund Kar-Man , Pfahl Stephan , Wernli Heini
Published: January 2024

Abstract. Research in the last few decades has revealed that rapidly ascending airstreams in extratropical cyclones – so-called warm conveyor belts (WCBs) – play an important role in extratropical atmospheric dynamics. However on the subseasonal timescale, the modulation of their occurrence frequency, henceforth referred to as WCB activity, has so far received little attention. Also, it is not yet clear whether WCB activity may affect tropospheric teleconnection patterns, which constitute a source of predictability on this subseasonal timescale. Using reanalysis data, this study analyzes the modulation of WCB activity by the Madden–Julian Oscillation (MJO). A key finding is that WCB activity increases significantly over the western North Pacific when the convection of the MJO is located over the Indian Ocean. This increased WCB activity, which is stronger during La Niña conditions, is related to enhanced poleward moisture fluxes driven by the circulation of subtropical Rossby gyres associated with the MJO. In contrast, when the convection of the MJO is located over the western North Pacific, WCB activity increases significantly over the eastern North Pacific. This increase stems from a southward shift and eastward extension of the North Pacific jet stream. However, while these mean increases are significant, individual MJO events exhibit substantial variability, with some events even exhibiting anomalously low WCB activity. Individual events of the same MJO phase with anomalously low WCB activity over the North Pacific tend to be followed by the known canonical teleconnection patterns in the Atlantic–European region; i.e., the occurrence frequency of the positive phase of the North Atlantic Oscillation (NAO) is enhanced when convection of the MJO is located over the Indian Ocean and similarly for the negative phase of the NAO when MJO convection is over the western North Pacific. However, the canonical teleconnection patterns are modified when individual events of the same MJO phase are accompanied by anomalously high WCB activity over the North Pacific. In particular, the link between MJO and the negative phase of the NAO weakens considerably. Reanalysis data and experiments with an idealized general circulation model reveal that this is related to anomalous ridge building over western North America favored by enhanced WCB activity. Overall, our study highlights the potential role of WCBs in shaping tropical–extratropical teleconnection patterns and underlines the importance of representing them adequately in numerical weather prediction models in order to fully exploit the sources of predictability emerging from the tropics.
Brain abscess as an otorhinolaryngological complication
Authors: Hernández Miguel , Zambrano Leal Mildred P.
Published: January 2024

Introduction: A brain abscess can be fatal if not diagnosed or treated promptly. It is more common in children than in adults and has a high mortality rate. Respiratory infections, such as otitis and sinusitis, usually precede brain abscesses. In most cases, double treatment, antibiotics, and surgery are necessary. Complications can be fatal even with proper treatment.
Clinical case: This was a 3-year-old girl with a history of respiratory infection. His parents took her to the emergency room due to a severe headache and a seizure episode. Clinical examination revealed left ear otalgia associated with pain and sensitivity to palpation of the mastoid region. Laboratory tests revealed leukocytosis of 18,770/MMC with neutrophilia, thrombocytosis of 628,000/MMC, elevated C-reactive protein of 8.35 mg/dl (average value 0.10-0.30 mg/dl) and elevated ferritin of 250.20 ng/dl (standard value 7-140 ng/dl). Due to the patient’s history and clinical findings, the skull's computed tomography (CT) was performed, revealing an image of evident hypodensity in the left hemisphere. MRI was also performed and revealed that the lesion was previously associated with left breast thrombosis. She received antibiotics and low-molecular-weight heparin with neurosurgical therapy, which produced good results.
Evolution: Despite the extent of the injury, he had two episodes of seizures. He promptly received appropriate antibiotic therapy and surgical treatment, which produced good results. Three months later, during the follow-up, he looked normal and had no long-term complications.
Conclusions: Complications of brain abscess, even with adequate treatment, can be severe and include epilepsy or death. Early treatment minimizes lethal risks.
Síndrome Inflamatorio Multisistémico Pediátrico asociado a COVID-19
Authors: Carrasco Ronquillo Isabel , Muñoz López Greta , Carrasco Ronquillo Gabriela
Published: January 2024

Introducción: El Síndrome Inflamatorio Multisistémico (MIS) es un trastorno de hiperinflamación que ha emergido como una preocupación significativa durante la pandemia de la COVID-19. Este síndrome afecta también a la población pediátrica, y las notificaciones de casos de Síndrome Inflamatorio Multisistémico en Niños (MIS-C) han aumentado en todo el mundo. Se observa una incidencia particularmente elevada en pacientes hispanos y afrodescendientes, alcanzando hasta un 23 % en Latinoamérica. Aunque no se ha establecido un vínculo directo entre MIS-C y el virus SARS-CoV-2, las investigaciones sugieren una conexión inmunológica tardía, mediada por un desequilibrio en la expresión de Th17/Threg, autoanticuerpos y complejos inmunes, especialmente en niños genéticamente susceptibles y/o con un medio endógeno alterado.
Métodos: En esta revisión teórica, se llevó a cabo una exhaustiva búsqueda bibliográfica en las bases de datos MEDLINE, LILACS y Google Académico. Se recopilaron datos relevantes sobre los mecanismos patogénicos e inmunológicos que contribuyen al desarrollo del MIS-C, así como información sobre su presentación clínica y su relación con otros síndromes inflamatorios de la infancia.
Resultados: MIS-C afecta predominantemente el sistema digestivo, cardiovascular y/o neurológico, manifestándose con fiebre, marcadores inflamatorios significativamente elevados y síntomas de disfunción orgánica. Comparte similitudes con la Enfermedad de Kawasaki, el Síndrome de Choque Tóxico y el Síndrome de Activación de Macrófagos; las investigaciones han confirmado que MIS-C presenta perfiles inmunes y de laboratorio singulares, estableciéndolo como una entidad clínica distinta.
Conclusiones: Esta revisión destaca la importancia de reconocer el Síndrome Inflamatorio Multisistémico en Niños como consecuencia de la infección por SARS-CoV-2. No se ha establecido completamente la conexión causal, los datos iniciales respaldan la existencia de MIS-C como una entidad clínica única. Comprender los mecanismos inmunológicos involucrados, así como las características clínicas distintivas, es esencial para la identificación temprana y el manejo adecuado de esta enfermedad en la población pediátrica.
UPAYA MENINGKATKAN PRESTASI DAN MOTIVASI BELAJAR MATEMATIKA MELALUI PEMBELAJARAN KOOPERATIF
Authors: Minarni Cicik
Published: January 2024

Tujuan penelitian tindakan kelas ini adalah untuk meningkatkan kemampuan siswa Kelas IV semester II tahun ajaran 2017/2018   SD Negeri Sidorejo II  Kecamatan Sugio  Kabupaten Lamongan  dalam membandingkan pecahan melalui pembelajaran kooperatif berbantuan benda-benda konkret. Penelitian ini menggunakan penelitian tindakan (action research) sebanyak dua siklus. Setiap siklus terdiri dari empat tahap, yaitu : perencanaan, plelaksanaan, pengamatan, dan refleksi. Sasaran penelitian ini adalah siswa kelas IV SDN Sidorejo II  Kecamatan Sugio  Kabupaten Lamongan  Tahun Pelajaran 2017/2018. Data yang diperoleh berupa hasil tes formatif dan lembar observasi kegiatan belajar mengajar. Hasil analisis data menunjukkan bahwa prestasi belajar siswa mengalami peningkatan dari siklus I ke siklus II, yaitu siklus I nilai rata-rata mencapai 70 dan siklus II mencapai 79,17. Sedangkan untuk ketuntasan belajar juga meningkat dari 66,7%  pada siklus I menjadi 91,67% pada siklus II.
IMPLEMENTASI METODE PEMBELAJARAN SQ3R DALAM UPAYA MENINGKATKAN HASIL BELAJAR BIOLOGI MATERI POKOK SISTEM PENCERNAAN MAKANAN
Authors: Ikhsan Mohammad
Published: January 2024

Penelitian ini  bertujuan untuk mengetahui dampak implementasi metode pembelajaran SQ3R terhadap peningkatan hasil belajar biologi materi sistem pencernaan makanan pada peserta didik kelas XI IPA di SMA Negeri 1 Paciran. Penelitian ini merupakan penelitian tindakan kelas (Classroom Action Research) yang dilaksanakan dalam 2 siklus.. Prosedur penelitian terdiri dari 4 tahap di setiap siklusnya, yakni perencanaan, pelaksanaan tindakan, observasi dan refleksi. Proses pembelajaran biologi dilaksanakan dengan menggunakan metode pembelajaran SQ3R. Indikator hasil belajar pada penelitian ini berupa tercapainya ketuntasan belajar secara individual maupun klasikal. Hasil penelitian menunjukkan bahwa: Hasil belajar biologi siswa melalui penerapan metode pembelajaran SQ3R mengalami peningkatan, khususnya pada materi pokok sistem pencernaan makanan. Pada siklus I diperoleh nilai diskusi individu < KKM sebanyak 7 anak sedangkan > KKM 22 anak dengan rata-rata 62,17 dan ketuntasan belajar 75,86% meningkat menjadi 75,62 dengan ketuntasan belajar 90,9% pada siklus II yaitu < KKM sebanyak 3 anak sedangkan > KKM 29 anak. Serta nilai evaluasi dengan rata-rata 65,84 dengan ketuntasan belajar 75% dan meningkat menjadi 76,56 dengan ketuntasan belajar 93,75% pada siklus II. Sehingga bisa disimpulkan bahwa terjadi peningkatan nilai rata-rata dari siklus I ke siklus II.
The Students’ Writing Anxiety at The Fourth Semester Students in Academic Writing Class
Authors: Paramarti Prajna Fawwaza Alya , Tusino Tusino , Widodo Sri , Masykuri Edi Sunjayanto
Published: January 2024

The purpose of this study was to find out how much writing anxiety exists among students, what causes it, and how to deal with it in academic writing courses. This research uses qualitative. This study was done at Universitas Muhammadiyah Purworejo using fourth-semester students who took an academic writing course as subjects. The findings revealed that the students' writing anxiety was in the high range (67.23). "High frequency of assignment" is a major cause of student writing anxiety in academic writing. The percentage obtained (31%), which was the highest among the components, showed this. Students overcame their writing anxieties by seeking assistance from friends, interacting with instructors, and reviewing journal references. It is possible to deduce that the students who took the academic writing course expressed worry.
EFL Teachers’ Voice about the Pedagogical Competencies in Teaching English Grammar Context
Authors: Hustiana Hustiana , Asdar Asdar , Ahyadi Ahyadi
Published: January 2024

This research was focused on understanding pedagogical competence voiced by EFL teachers in teaching grammar context. The research was conducted in Makassar. This study was descriptive qualitative research that involved six teachers in Makassar as participants which chose randomly. The instrument of this research was an interview which was analyzed with a qualitative method. The result of the current study showed that four indicators including pedagogical competence owned by the teachers namely the competence in understanding the students’ need in learning grammar, competence in preparing teaching grammar, competence in choosing method and technique in teaching grammar, and competence in choosing assignment and evaluating the students’ outcome after learning grammar. This research would have a great theoretical and practical contribution to undergraduate students and future researchers in the English language department, especially students from the education department or candidates of teachers in terms of understanding pedagogical competence.
The Language Relativity on Students' Essay Writing by Utilizing Mind Mapping Technique in EFL Learning
Authors: Hafidz Moh. , Ulfa Siti Maria
Published: January 2024

This article discusses essay writing techniques, preposition and transitional words, and terms that cannot be lexically or syntactically comprehended but can be culturally understood. The purpose of this study is to discover language relativity in students' essay paragraphs utilizing a mind mapping technique in EFL learning. The researcher employed a descriptive strategy, observing and documenting the writing process in class. The participants were distinguished by their diverse living, educational, and professional backgrounds.  These writings were descriptively assessed using appropriate literature, and observations were also undertaken to arrive at a reasonable interpretation. As a result, mind mapping with language relativity integrates meaningful students' knowledge such as history, linguistics such as preposition and transition word usage, and Indonesian cultural types and values such as Sarabi, Gempol Ice, and Rujak Cingur are Indonesian  iconic culinary to organize and structure into essay writing fluently in EFL learning.
Students’ Perception toward Using Canva in EFL Business Correspondence Class
Authors: Hapsari Anita Dwi
Published: January 2024

Integration of ICT into ELT is something inevitable in this information era. This had been started years ago with the emergence of CALL. Now, with the ubiquity of mobile devices, MALL has started to emerge. This research analyzed the students’ perception of using Canva in Business Correspondence class. The researcher formulated the research problem as: How is the student’s perception toward using Canva in EFL Business Correspondence class? This could lead to other English lecturers realizing how useful* Canva is for Business Correspondence class. Additionally, it helps to evaluate the teaching and learning process to improve it going forward by seeing the viewpoints of the students. This study was a content analysis of qualitative research. Ten statements representing students’ opinions about using Canva served as the study’s instrument in the Business Correspondence class. The indicators are divided into three, they are usefulness, ease, and suitability of Canva for Business Correspondence class. The findings indicated that while 8,75% of students were neutral, 91,25% of all students agreed and strongly agreed that Canva is helpful for Business Correspondence classes. At that point, 95% of the students who agreed or strongly agreed that the Business Correspondence class would be easier for them overall received that score. In the Business Correspondence class, 91,67% of students responded positively about its applicability, with only 8,33% somewhat agreeing. In light of this, it can be said that Canva is a useful visual design tool that may be used in Business Correspondence classes. The study’s findings ought to shed light on the pedagogical implications of utilizing Canva in language teaching as well as the possible advantages of doing so from the student’s perception.
THE ART OF NUMBERS: A MATHEMATICAL EXPLORATION
Authors:   Glocal university, saharnpur, MISHRA Prof. (Dr.) PANKAJ KUMAR
Published: January 2024

WELCOME TO "THE ART OF NUMBERS: A Mathematical Exploration, As you hold this book in your hands or view it on your screen, you embark on a journey into the intriguing, beautiful, and creative world of mathematics. This book is an invitation to explore the profound connection between mathematics and art, where numbers and equations become strokes on a canvas, and mathematical concepts transform into masterpieces of human imagination.