bluuebunny/crossref_metadata_2025 huggingface dataset:
Kehidupan Masyarakat Pasca Penutupan Lokalisasi Pakem Banyuwangi Tahun 2013
Authors: Setyoningrum Wulandari , Nurullita Hervina
Published: August 2024

Lokalisasi adalah tempat yang dikhususkan oleh pemerintah kota bagi pekerja seks komersial. Lokalisasi atau komplek pelacuran itu umumnya terdiri dari rumah kecil yang berlampu warna-warni, yang dikelola oleh mucikari atau germo. Para germo ini sering dipanggil dengan sebutan “mami dan papi”. Tempat tersebut disediakan tempat tidur, kursi tamu, pakaian dan alat-alat berhias, juga tersedia gadis-gadis dengan tipe, karakter dan suku bangsa yang berbeda. Prostitusi atau pekerja seks komersial (PSK) sebagai salah satu penyakit masyarakat mempunyai sejarah yang panjang sejak adanya kehidupan manusia, pekerja seks komersial (PSK) sebagai salah satu penyimpangan dari pada norma-norma perkawinan, dan tidak ada habis-habisnya yang terdapat di semua negara di dunia. Prostitusi ini memberikan dampak yang signifikan terhadap masyarakat sekitar lokalisasi khusunya pada bidang sosial. dalam penelitian ini merujuk pada dampak yang terjadi di masyarakat setelah penutupan lokalisasi Pakem Banyuwangi.
Rancang Bangun Sistem Informasi E-Learning di SMK Pasundan Rancaekek
Authors: Rohman Rohman , Atmoko Dwi
Published: August 2024

The design of an E-Learning information system is a system created to solve the problems being faced by SMK Pasundan Rancaekek in teaching and learning activities offline or face to face in front of the class. At least there are several problems that often occur during teaching and learning activities using the lecture method or explaining material in front of the class. So that it can cause some students to feel bored and some even fall asleep in class, besides that some students who can't go to school that day will miss the material, apart from students, the offline method can also have an impact on students if the teacher is unable to attend, so that the material on that day can't be delivered. The system development used in this research is OOAD (Object oriented analysis design) with the RUP (Rational unified process) model. And the system modeling tools it uses are UML (Unified Modeling Language) with the tools used are Use Case Diagrams, Class Diagrams, Activity Diagrams, and Sequence Diagrams. The results showed that With the design of this E-Learning information system, it is hoped that it can help solve the problems being faced by teachers and students at Pasundan Rancaekek Vocational School and teaching and learning activities can become more interesting and students who learn do not feel bored.
Inovasi Sistem Pembelajaran Masa Pandemi COVID-19 Pada Pendidikan Anak Usia Dini Di RA Hibah
Authors: Adistiarachma Nazila , Purwati Purwati
Published: August 2024

The global covid-19 pandemic has had far-reaching effects on education as well. Whole education, including early childhood education, makes it impossible to engage in face-to-face teaching, so an innovation of learning systems is needed to hold it. Contrary to current circumstances, some schools already carry out face-to-face learning but with strict health protocols. So RA Hibah has carried out face-to-face study with health protocol. Thus, the study is carried out with a view to discovering the innovation of the different learning systems that RA Hibah made during the pandemic, since the pandemic is not over and so the study is carried out according to conditions. Research methods use qualitative research methods, with data collection techniques of observation, interviews, and literature studies. Observations and interviews have found that innovation in learning systems during pandemics in RA Hibah, which is online learning, rolling learning, and offline learning.
Efektivitas Multimedia Interaktif Dalam Meningkatkan Kemampuan Bahasa Anak Usia 4-5 Tahun
Authors: Nizrina Elena Himma , Rusdiyani Isti , Fadlullah Fadlullah
Published: August 2024

One of the factors that support the process of renewal and novelty is technology and information, especially utilization and novelty in the field of education. In the process, many learning activities in schools still use direct instructional (conventional) methods and media in the delivery of material for developing children's language skills, one of which is. Annizhomiyyah Kindergarten at Pandeglang Banten is the focus of this research. Aims to determine the effectiveness of using interactive multimedia in improving language skills of children aged 4-5 years. Using an experimental quantitative approach with a one group pre-test post-test design for a sample of 16 children. Data were collected through questionnaires and documentation. The initial results of the pre-test resulted in an achievement rate of 54% and after treatment the post-test results obtained an achievement rate of 95%. This concluded that the use of interactive multimedia in the process can significantly improve the language skills of children aged 4-5 years and based on the existing rating scale. on the criteria of a high level of effectiveness.
Analysis of The Influence of Service Quality and Customer Satisfaction on the Intention to Buy 3kg LPG at Pangkalan Rizky Inayah
Authors: Cholis Nur , Fitrianty Rifda
Published: August 2024

Good service is the key to customer satisfaction so good service must be considered. Good service provides satisfaction and trust to customers who use the company's services or products. The purpose of this study is to find out the impact of good customer satisfaction, the benefits of good customer service satisfaction, high customer satisfaction, high customer satisfaction with purchases, and the benefits of good customer service satisfaction. Happy buying drivers. In accordance with its purpose, this research is used in many ways. The study has different independent service models, when the difference between customer satisfaction and customer satisfaction is different. The purpose of this study is to find out the benefits of service quality and customer satisfaction towards the purpose of purchasing 3kg LPG from Pengklan Rizki Anaya. The results of the study show that the service has been effective and efficient for satisfied customers. Satisfaction is good and important. It has an impact on resilience, and good service. Positive and negative impacts in thinking will return.
Analysis of the Influence of Work-Life Balance Policy on Employee Performance in Service Companies
Authors: Saputra Helmi
Published: August 2024

This study investigates the effect of work-life balance on personnel performance in Service companies. The research method is qualitative method, sampling through observation and interview method, data analysis technique is multiple linear regression analysis. This research also shows the existence of concurrent influence, which indicates the existence of work- life balance variables that have a significant concurrent influence on employee performance
Analysis of Disruption of Consumer Buying Interest in Cake Products at Mom's Shop During the Pandemic
Authors: Urbach Hesti Ningrum Naufal
Published: August 2024

This study aims to find out what can affect the decline in consumer buying interest in pastry products at MSME Mom's Shop during the pandemic. The type of research used in this research is descriptive qualitative. In this study, researchers conducted interviews with consumers of the MSME Mom's Shop business as well as the owners and processors of the business. Researchers analyzed some that have been found, how are the factors that can affect consumer buying interest. In this study, researchers found four factors that influence consumer buying interest in pastries. Four factors were found, namely, the factor of making their own, being skilled at other stores, economic factors, and switching to online stores rather than the MSME Mom's Shop business which had to leave the house.
The Influence of Compensation and Work Motivation on Employee Productivity at The Naura Seafood Frozen Sidoarjo Store
Authors: Hartanti Elsa Putri
Published: August 2024

To increase profits for the company, a highly motivated workforce is needed. Profits will increase if supported by good worker productivity. Achieving these goals depends on the policies taken by the company. However, on the other hand, workers' work productivity decreases due to low work motivation and compensation that is relatively only sufficient for workers' basic living needs; this results in targeted production not being achieved according to the targets set. Company, regarding goals. This research aims to determine (1) the compensation provided by the Naura Frozen Seafood Shop in Sidoarjo, (2) the work motivation of workers at the Naura Frozen Seafood Shop in Sidoarjo, (3) work productivity at the Naura Frozen Seafood Shop in Sidoarjo, and (4) the influence of compensation and motivation both collectively and individually on work productivity at the Naura frozen seafood shop in Sidoarjo. The method used is descriptive and an expansive survey of the Naura Seafood Frozen Sidoarjo shop workers analysis unit. Sampling used a simple random sampling method with a sample size (n) of 85 workers. The type of research in this research is causality, the time horizon in this research is cross-sectional, and the analysis methods used are frequency distribution and path analysis. The findings of this research are that compensation and motivation both jointly and individually influence the work productivity of workers at the Naura Seafood Frozen Sidoarjo shop. However, partial motivation is more dominant in influencing work productivity than compensation.
Improving Sales Performance Using SWOT Analysis in Surabaya Digital Marketing Services
Authors: Nabilah Elvina Shafa , Wahjoedi Tri
Published: August 2024

Digital marketing is an advertising activity that uses quality online media on the internet network. By using the company's theme products, your atmosphere can be edited through the Canva application, Adobe Photoshop to make video content as attractive as possible. With an application that makes it easy for business people to sell products and promote their products directly on a regular basis using existing media. All business leaders will compete with those who really strengthen technological progress, so your business can survive in this digitalization era successfully and purposefully to achieve company goals by taking the right steps so that consumers are not disappointed with producer performance services. Behind the popularity of digital technology, it is making it easier for people to sell various services and business products. In compiling this internship report, a qualitative method uses information gathering by the author by direct observation at "Prior ads Digital Marketing Services Surabaya" in gathering information. From the Cartesian diagram above, the position of the company "Prior ads Digital Marketing Services Surabaya" is in the quadrant which indicates that the company's position is in a position of considerable internal strength, but also has the greatest threat, so it must use a strategy. which aims to increase sales through employee performance, service production, and existing content development.
The Effect of Product Quality, Price, Sales Promotion on Repurchase Interest in the Maternal Disaster Distro Brand in the Instagram Application
Authors: Alamsyah Ahmad Yusuf Rafi'i , Fadhli Khotim , Qomariyah Siti Nur
Published: August 2024

Aplikasi Instagram merupakan salah satu bentuk pemasaran yang berkembang pesat pada platform media sosial. Penelitian ini bertujuan untuk menganalisis pengaruh kualitas produk, harga, dan promosi penjualan terhadap minat beli ulang pada merek distro maternal disaster pada aplikasi Instagram. Penelitian ini menggunakan pendekatan kuantitatif dengan metode survei terhadap pengguna aplikasi Instagram yang merupakan pengikut akun Instagram maternal disaster dan telah membeli produknya. Pengumpulan data dilakukan melalui kuesioner yang disebarkan secara online kepada 100 responden. Uji analisis regresi linier berganda digunakan dalam penelitian ini dengan alur uji asumsi klasik, uji hipotesis (uji-t) dan uji koefisien determinasi (R2). Berdasarkan hasil pengujian, variabel kualitas produk (X1) secara parsial berpengaruh positif dan signifikan terhadap minat beli ulang produk merek distro maternal disaster. Sedangkan hasil pengujian variabel harga (X2) tidak berpengaruh secara parsial terhadap minat beli ulang produk merek distro maternal disaster. Sedangkan hasil pengujian variabel promosi penjualan (X3) secara parsial berpengaruh positif dan signifikan terhadap minat beli ulang produk merek distro maternal disaster. Secara simultan, hal tersebut menunjukkan bahwa kualitas produk, harga, dan promosi penjualan memiliki pengaruh positif dan signifikan terhadap minat beli ulang pada merek distro maternal disaster. Faktor kualitas produk merupakan faktor yang paling dominan dalam mempengaruhi minat beli ulang, diikuti oleh faktor promosi penjualan.
Analysis of Lampung Export Value 2015-2023 with The Arima Method Approach (Autoregressive Integrated Moving Average)
Authors: Agmadeni Royiv
Published: August 2024

One indicator to see the economic development of a country is to look at the value of international trade or what is commonly referred to as export-import activities. This activity is one of the foreign exchanges for the country. Proper planning will increase this activity which will also have an impact on increasing the country's foreign exchange. To improve the welfare of the Indonesian people, one alternative is to increase the rate of economic activity in Indonesia, one of which is export activity. Increasing export activities is inseparable from the right economic strategy. The strategy can be formed by knowing the economic market conditions, namely by forecasting. One of the forecasting methods that can be applied is the Autoregressive Integrated Moving Average or ARIMA method. The best ARIMA model that fulfills is the ARIMA (2,1,0) model because of the smallest AIC value.
Analysis of E-Commerce Utilization in Consumers as Culinary MSMEs in East Jakarta
Authors: Alia Rahma , Hoholongan Rutinaias , Pratama Erlangga Aldi , Akbar Maulana , Alfaqih Muhammad Arifin , Alang Herlando Hosea , Zulfikar Zulfikar
Published: August 2024

The purpose of this study research is to analyze the use of E-Commerce in consumers  MSMEs which is based on the current development of globalization and its impact on technological progress and economic income. Analysis used to identification of the internal and external environment of culinary MSMEs. The Analysis we use in the study is qualitative research combined with descriptive analysis of the depiction of the object study in depth. So,  a depiction of the object study can be provided. This data collection method is through survey information, and interviews. The results of this research show that e-commerce can provide broader information about culinary MSME products. An E-commerce system can also be a promotion for culinary MSME business actors to the establishment of buying  online.
Pengabdian Masyarakat Bertajuk Satu Langkah Kecil untuk Semangat Berbagi
Authors: Lumbantoruan Rachel Mia Lorenza , Napitupulu Evi Enitari
Published: August 2024

Community service activities carried out by lecturers and students of Sari Mutiara Indonesia University at the Elsadai Indonesia Orphanage with the theme "One Small Step for the Spirit of Sharing" have been carried out well on October 13, 2023. The target of this social service or social service activity is to focus on orphans and orphans. The form of this service activity is introductions, briefings or lectures, discussions and competitions or games. This social service activity aims to increase the sense of concern of lecturers and students in helping others in facing social problems such as limited education, economy, and social inequality. The community service that has been carried out is expected to inspire and motivate lecturers, especially the general public to share and care for each other.
Analyzing the Directions of Transformation of the Mining and Metallurgical Complex of Ukraine
Authors:   Research Centre for Industrial Problems of Development of NAS of Ukraine, Kyzym Mykola O. , Khaustova Viktoriia Ye. ,   Research Centre for Industrial Problems of Development of NAS of Ukraine, Kotliarov Yevhen I. ,   Research Centre for Industrial Problems of Development of NAS of Ukraine, Shulha Ihor V. ,   Ukrainian State Research Institute for Carbochemistry (UKHIN)
Published: August 2024

The aim of the article is to select and substantiate the technology of blast-furnace (coke-free) steel production, which can be used in Ukraine, taking into account the existing raw material base, the provision of the necessary energy resources and other specific conditions of the country. Technologies of direct reduction of iron (coke-free metallurgy), which are of industrial importance, are based on the interaction of iron ore (in the form of pellets) with synthesis gas (a mixture of hydrogen and carbon monoxide). In this case, hydrogen is used as an iron reducing agent, and carbon monoxide is burned with the release of heat necessary for the chemical reaction to take place. Synthesis gas on an industrial scale is produced either by steam catalytic conversion of natural gas or by coal gasification. Production of synthesis gas from natural gas can significantly reduce greenhouse gas emissions compared to coke oven metallurgy (from 1.4–1.7 to 0.328 tons of carbon dioxide per 1 ton of iron). Yet, in the current conditions of Ukraine, this technology cannot be used due to the shortage of natural gas and high prices for it. Direct reduction of iron by synthesis gas obtained from coal in Ukrainian conditions has great prospects due to the presence of large reserves and developed coal mining of those grades of coal that are most suitable for gasification. Reduction of greenhouse gas emissions with this technology can be achieved if synthesis gas with a hydrogen content of more than 67% is obtained at the gasification stage. The article also discusses the prospects of hydrogen metallurgy, in which only hydrogen obtained by electrolysis of water is used as a reducing agent and a source of heat necessary for the reaction. Under the current conditions of Ukraine, the only source of electricity for electrolysis can be considered a specially built solar power plant. It is calculated that a power plant with a capacity of more than 100 MW is required to produce 1 million tons of direct reduced iron. The possibility of constructing a complex for the production of direct reduced iron using only hydrogen requires further research.
Trastornos de conciencia asociados a lesiones cerebrales traumáticas: nociones básicas
Authors: García-Molina Alberto , Enseñat-Cantallops Antonia
Published: August 2024

Las personas con lesiones cerebrales graves de origen traumático pueden experimentar trastornos de conciencia. En este artículo se describen los más habituales: Coma, Síndrome de Vigilia sin Respuesta, Estado de Mínima Conciencia y Estado Confusional Postraumático. El Coma es un trastorno de conciencia caracterizado por la ausencia total de respuestas. El Síndrome de Vigilia sin Respuesta comporta la ausencia de conciencia de uno mismo y del entorno, con presencia de ciclos sueño-vigilia. Mientras que en el Estado de Mínima Conciencia se observan evidencias conductuales mínimas sugestivas de autoconciencia. Por último, el Estado Confusional Postraumático tiene como rasgos distintivos la desorientación (en persona, espacio y/o tiempo), las alteraciones atencionales y la afectación de la memoria. Si bien esta taxonomía es sumamente útil, la realidad clínico-asistencial demanda nuevas aproximaciones que entiendan la conciencia desde una perspectiva que aúne intereses diagnósticos y rehabilitadores.
Narrativas de familiares sobre el duelo y la muerte por COVID-19 en chile: un estudio psicoanalítico
Authors: Pérez Carrasco Eduardo
Published: August 2024

Antecedentes: La pandemia COVID-19 presentó graves consecuencias a nivel mundial, con más de 6.81 millones de muertos y 681 millones de contagiados. En Chile, los efectos también fueron devastadores, especialmente en la pérdida y el duelo. Propósito: Conocer las narrativas de los familiares de fallecidos por COVID-19 en Chile y su experiencia de duelo bajo una mirada psicoanalítica. Método: Se utilizó una metodología cualitativa con enfoque narrativo temático, empleando entrevistas en profundidad. Se realizó un análisis narrativo temático, con el uso de Atlas.ti, desde la codificación a la categorización. Resultados: Se identificaron cinco categorías narrativas temáticas que son: Características de la muerte en pandemia por COVID-19 en Chile; Destinos del duelo (duelo patológico, duelo, melancolía); Factores que afectan la muerte y el duelo en el contexto de pandemia por COVID-19; La relación entre los familiares y las instituciones de salud; y Sobre las experiencias traumáticas y la desmentida. Conclusiones: El duelo de familiares de personas fallecidas por COVID-19 se traumatiza cuando los contextos carecen de: entrega de información oportuna, contención emocional, conversaciones directas y cuidadosas sobre la muerte, presencia de espacios físicos de cuidado y por último preparación a las familias en cada uno de los pasos del rito mortuorio.
The Impact of Integrating Process Writing with Analytical Reading of Informational Texts on Improving Academic Essay Writing among Palestinian English Majors and their Attitudes Towards it
Authors: Zulfa Sh. Badereddeen
Published: August 2024

The purpose of the current study is to investigate the impact of integrating process writing with analytical reading of informational texts on improving academic essay writing among Palestinian English majors and their attitudes towards it. The study is a quasi-experimental research. To illustrate, an intact class consisting of 30 freshmen English majors are the participants in the experiment. The instruments used are a pre-and-post focusing on writing academic cause and effect essay and a focus group discussion designed to gain deeper insights into the participants' perception of academic writing pre and post intervention. The intervention includes an analytical reading of informational texts, particularly cause and effect essays, and training on process writing use; then, the participants will integrate the information they have gotten through analytical reading with process writing to produce cause and effect essays. The result shows that the post-test scores outperform the pretest scores, and the focus group discussion reveals that the participants' attitudes toward academic writing improved after the intervention.
Research on the Development Process and Prospects of Hong Kong, China's International Financial Center
Authors: Lu Lishan
Published: August 2024

This article aims to delve into the development history and future prospects of Hong Kong, China's international financial center. Since opening up to the outside world for port construction, Hong Kong has leveraged its unique geographical location, historical background, and free economic system to rapidly develop its modern financial industry, gradually evolving into a globally renowned international financial center. The rise of a financial center to its current status is primarily attributed to two factors: the sophistication of economic and financial systems, and the pivotal turning points in industry development. While the initial accumulation of capital is crucial to the development of a financial center, Hong Kong's pre-colonial era was marked by a low level of social development and a small population, meaning that the initial accumulation of capital was relatively later-stage. Consequently, the impact of industrial transformation on Hong Kong's overall financial sector can be deemed negligible. This article primarily analyzes the reasons behind Hong Kong's secure position as an international financial center from three angles: its development history, current status, and future prospects, as well as the potential opportunities and challenges it may encounter.
Analisis Strategi Pemasaran Produk Gadai Syariah dan Minat Nasabah di Pegadaian Syariah Kabupaten Bantaeng
Authors: Sumiati Sumiati
Published: August 2024

Penelitian ini merupakan penelitian kualitatif. Hasil penelitian menunjukkan bahwa strategi pemasaran yang dilakukan oleh Pegadaian Syariah Unit Pasar Baru Kabupaten Bantaeng tersebut dengan menggunakan konsep strategi pemasaran marketing mix atau yang disebut dengan bauran pemasaran yaitu strategi pemasaran, strategi pemasaran produk, strategi pemasaran tempat dan strategi pemasaran promosi. Kemudian dalam menarik minat nasabah PT. Pegadaian Syariah unit pasar baru kabupaten Bantaeng menggunakan strategi dengan cara pihak pegadaian syariah mnggunakan kegiatan promosi yang dilakukan berupa memberikan browsur kepada masyarakat, dengan begitu bisa memudahkan memberikan informasi dengan masyarakat yang berada disana. Kemudian ditinjau dari hukum islam strategi yang dilakukan oleh PT. Pegadaian syariah unit pasar baru Bantaeng menggunakan etika bisnis islam untuk menghindari terjerumusnya dari bermuamalah yang mengandung riba atau bisa merugikan banyak pihak.
Izin Poligami Berdasarkan Putusan Nomor: 248/Pdt.G/2021/PA.Sgm dalam Prespektif Syariah
Authors: Maryati Maryati , Dewi Nirsa , Akil M , Hasibuddin Muhammad
Published: August 2024

Tujuan dari penelitian ini adalah pertama, untuk mengetahui bagaimana kedudukan izin poligami berdasarkan putusan Nomor 248/Pdt.G/2021/PA.Sgm. Kedua, untuk mengetahui bagaimana putusan Nomor 248/Pdt.G/2021/PA.Sgm tentang izin poligami dalam hukum Islam. Penelitian ini menggunakan metode penelitian Kualitatif dengan pendekatan deskriptif kualitatif. Teknik pengumpulan data yang digunakan adalah dengan metode wawancara mendalam serta analisis dokumen. Hasil penelitian ini menunjukkan bahwa pertama, kedudukan izln poligami Majelis Hakim Pengadilan Agama Sungguminasa memutuskan mengabulkan izin poligami terhadap perkawinan pemohon dan termohon, sebab poligami adalah suatu sistem perkawinan dimana seorang laki-laki menikahi lebih dari satu orang perempuan dalam waktu bersamaan. Kedua, Putusan tentang izin poligami dalam hukum islam adalah izin kepada istri pertama itu bukan syarat dan bukan sebuah kewajiban. Artinya jika ada suami tanpa izin istri dia berpoligami, nikahnya sah selama syarat dan rukun nikah terpenuhi. Kesimpulan dari penelitian ini yakni baik dari kedudukan prespektif hukum islam dalam izin poligami adalah apabila permohonan pemohon telah memenuhi persyaratan izin poligami sebagaimana yang dikehendaki oleh Pasal 5 (1) Undang-Undang Nomor 1 Tahun 1974 Tentang Perkawinan. Pasal 41 Peraturan Pemerintah Nomor 9 Tahun 1975. Pasal 57 Kompilasi Hukum Islam, sehingga permohonan pemohon untuk menikah lagi dapat dikabulkan dan menetapkan harta bersama
Kajian Temporal dan Spasial Sebagai Deiksis Konvensional dalam Novel Tokyo dan Perayaan Kesedihan Karya Ruth Priscilia Agelina
Authors: Ratri Risalah Damar , Rumilah Siti
Published: August 2024

This study aims to analyze temporal deixis and spatial deixis in the novel Tokyo dan Perayaan Kesedihan by Ruth Priscilia Angelina and find out how the temporal and spatial deixis presented by the author in the novel Tokyo dan Perayaan Kesedihan can create indirect communication between the author and the reader. The research design applies descriptive qualitative data as sources of speech texts in the novels Tokyo dan Perayaan Kesedihan by Ruth Priscilia Angelina. Data collection utilizes documentation techniques and data analysis, classifying data according to the problem formulation and drawing conclusions after the analysis process using Yule's theory regarding temporal deixis and partial deixis. The results of the research are first: 8 temporal deixes, namely in words, and 8 spatial deixes, including the words now, tomorrow, a year, here, then, earlier, and spatial deixis, totaling 8 words, namely here, in the middle, this way, next to, around here, in the forest, and in the city. The two attempts to present temporal deixis and spatial deixis in the novels Tokyo and Celebration of Sadness by the author are given references according to the context of the speech between the characters so that the reader is able to understand the intent and meaning of the temporal deixis and spatial deixis in the speech events between the characters.
Моделирование изгиба пластины из сплава с памятью формы с учетом влияния скрытой теплоты превращения и теплообмена с окружающей средой
Authors:   Санкт-Петербургский государственный университет, Санкт-Петербург, Россия, Вуколов Е. А. , Волков А. Е. ,   Санкт-Петербургский государственный университет, Санкт-Петербург, Россия, Евард М. Е. ,   Санкт-Петербургский государственный университет, Санкт-Петербург, Россия, Беляев Ф. С. ,   Санкт-Петербургский государственный университет, Санкт-Петербург, Россия,   ФГБУН Институт проблем машиноведения РАН
Published: August 2024

Решена полностью связная краевая задача об изгибе пластины из сплава с памятью формы в условиях теплообмена с окружающей средой и диффузии тепла вдоль толщины пластины, а также с учетом влияния скрытой теплоты мартенситного превращения. Задача включает в себя решение уравнений механического равновесия, теплопроводности и определяющих соотношений для деформации сплава с памятью формы, реализованных микроструктурной моделью. Данная модель учитывает упругую, температурную и фазовую деформации материала, последняя - связанная с протекающими в нем фазовыми переходами. Выполнен расчет поля температур в пластине, испытывающей прямое мартенситное превращение при ее охлаждении с поверхности. Найдены распределения температуры по толщине пластины для ряда последовательных моментов времени, соответствующих различным значениям температуры окружающей среды. В частности, найдены зависимости от времени температуры на поверхности и в центре пластины. Показано, что без учета выделения скрытой теплоты превращения получаются значительные погрешности в расчете времени, необходимого для завершения прямого превращения. Выполнено моделирование быстрого изгиба пластины при температуре sM (начала прямого мартенситного превращения) и последующей выдержке при постоянном изгибающем моменте в условиях постоянной температуры окружающей среды. Показано, что нейтральный слой, в котором напряжения равны нулю, не находится в середине поперечного сечения, а смещен в сторону сжатых слоев из-за асимметрии свойств рассматриваемого сплава по отношению к растяжению-сжатию. В результате теплопередачи происходит снижение температуры во внутренних слоях пластины, сопровождаемое прямым фазовым превращением и накоплением деформации во времени. Это явление можно формально трактовать как ползучесть. При выдержке в условиях фиксированного прогиба происходит релаксация напряжений во времени. Данные эффекты следует учитывать при проектировании функциональных устройств с рабочим телом из сплава с памятью формы.
Пластические эффекты при разрушении на границе нанокристаллического и кристаллического сплавов при криогенных температурах
Authors:   ФГАОУ ВО «Национальный исследовательский технологический университет «МИСИС», Москва, Россия, Ошоров А. Д. , Ушаков И. В. ,   ФГАОУ ВО «Национальный исследовательский технологический университет «МИСИС», Москва, Россия, Хозром И. М. ,   ФГАОУ ВО «Национальный исследовательский технологический университет «МИСИС», Москва, Россия, Сафронов И. С. ,   ФГАОУ ВО «Национальный исследовательский технологический университет «МИСИС», Москва, Россия
Published: August 2024

В статье анализируется физика деформирования и разрушения на границе композиционного соединения на основе нанокристаллического/аморфного и кристаллического сплава при температуре жидкого азота. Для исследования подготовлены слоистые композиты на основе нанокристаллического сплава торговой марки 5БДСР и аморфного металлического сплава торговой марки 82К3ХСР с легкоплавкими сплавами. Проведены механические испытания подготовленных образцов на одноосное растяжение при комнатной температуре и температуре жидкого азота. При растяжении композиционных соединений было выявлено, что часть образцов имеют вязкий характер разрушения вне зависимости от температуры испытания. На основании полученных экспериментальных результатов выдвинута теория саморазогрева в вершине трещины композита, объясняющая вязкий характер разрушения при температурах жидкого азота. На основании предложенной теории проведено моделирование, которое показало, что энергии, выделяемой перед вершиной трещины достаточно для разогрева материала на 100-200 K и перехода к вязкому разрушению. Это процесс вероятностный и может определяться характером роста трещины в начале процесса разрушения. В случае, если росту трещины предшествуют атомные перестройки, то разрушение будет вязким даже при криогенной температуре композиционного образца в целом. Предложена физическая модель деформирования и разрушения на границе между нанокристаллической/аморфной и кристаллической фазой в композиционных соединениях «легкоплавкий кристаллический сплав - нанокристаллические/аморфные пленки», объясняющая сохранение вязкого характера разрушения в температурном диапазоне 77 К и 293 К в условиях одноосного растяжения.
Characteristics and outcomes associated with CD2 and CD25 expression on bone marrow mast cells in patients with systemic mastocytosis
Authors: Rossignol Julien , Georgin-Lavialle Sophie , Canioni Danielle , Beganovic Omer , Brouzes Chantal , Fain Olivier , Heiblig Maël , Gourguechon Clément , Guilpain Philippe , Bulai-Livideanu Cristina , Barete Stéphane , Agopian Julie , Brenet Fabienne , Dubreuil Patrice , Lemal Richard , Tournilhac Olivier , Terriou Louis , Launay David , Bouillet Laurence , Chatain Catharina , Damaj Ghandi , Ballul Thomas , Greco Celine , Polivka Laura , Frenzel Laurent , Meni Cécile , Bouktit Hassiba , Benabou Dina , Devin Clotilde , Gaudy-Marqueste Caroline , Gousseff Marie , Le Mouel Edwige , Neel Antoine , Ranta Dana , Jaussaud Roland , Jo Molina Thierry , Bruneau Julie , Javier Rose-Marie , Pelletier Fabien , Castelain Florence , Retornaz Frederique , Cabrera Quentin , Zunic Patricia , Gourin Marie Pierre , Wierzbicka-Hainaut Ewa , Viallard Jean François , Lavigne Christian , Hoarau Cyrille , Durieu Isabelle , Dimicoli-Salazar Sophie , Torregrosa-Diaz Jose Miguel , Duval Audrey , Garcelon Nicolas , Lespinasse Jeremie , Soria Angèle , Chantran Yannick , Arock Michel , Bodemer Christine , Lortholary Olivier , Asnafi Vahid , Hermine Olivier , Lhermitte Ludovic
Published: August 2024

Not available.
Influence of rock shear processes on the methane content of longwall faces
Authors: Maussymbaeva A. D , Portnov V. S , Imanbayeva S. B , Rabatuly M , Rakhimova G. M
Published: August 2024

Purpose. To establish patterns of change in methane content during formation of zones of unloading of rock mass caused by a longwall face progression. Methodology. Determination of gas content (methane content) of coal seams, ash content of Karaganda basin coals, methane content of mine workings was made on the basis of taking and cutting samples from the coal massif in the laboratory of “Management of special maintenance and gasification” of the Coal Department of JSC “Qarmet” according to the DMT methodology (Germany). The chemical structure of gases of k10 seam was determined in the laboratory of Scientific Research Center “Ugol” (Karaganda), as well as by samples of air-gas mixture of degassing wells and in the working area of Saranskaya mine. Findings. A model of geomechanical structurization of rock massif was developed, patterns of methane content changes were established, obtained in specific mining-technological conditions of the mine, which were used for productive and safe work on coal excavation. Originality. For the first time a model of geomechanical structurization of the coal-rock massif in the conditions of longwall faces was developed; a parametric model determining the intervals of the mining pillar to increased methane flows into the mined-out space was developed; a connection between the dynamics of geomechanical processes in the mined-out coal-rock massif and the methane content of the mine face was established. Practical value. The established regularities of change in methane content of mining pillar areas arising at rock shear make it possible to plan degassing of mining area, to provide safe working conditions for miners on gas factor, to forecast the moment of formation of the main roof vaults of different levels and methane emission into the mine face to control mining, which were tested at Saranskaya mine Coal Department of JSC “Qarmet”.
Implementation of a mathematical component in the device development for operational control of the dump truck
Authors: Shcherbakov P , Tymchenko S , Moldabayev S , Sarybayev N , Klymenko D , Ulanova N
Published: August 2024

Purpose. To create a device for weighing mining rock loaded into the body of a dump truck after each cycle of its excavation. To develop a mathematical block for calculating the net mass of the rock without taking into account extraneous factors affecting the accuracy of the obtained result. To provide operational control of the nominal load of the dump truck by the driver and excavator operator. Methodology. The methodological basis for solving the task is a comprehensive approach which includes electronic modeling of technical processes, methods of mathematical statistics, analysis of results in a mathematical package and their applied application. Findings. A functional and principled electrical diagram of the device for weighing the mining rock loaded into the body of a dump truck and transferring the final information to this excavator has been compiled. A mathematical block of the device was created, capable of memorizing the signals received from the primary information sensors before weighing, and subtracting them from the signals received from these sensors after each weighing cycle. As sensors of primary information, it is proposed to use selsyns, which are part of the transformer mode, which are mass-produced by the industry, reliable in operation and easy to maintain. Originality. The proposed device is made at the level of the invention; its priority is determined by the constructive development and technical solution. Namely, the device is equipped with a multistable memory transformer, to the erasing winding of which a tachogenerator (or tachometer generator) is connected through an amplifier, a chain of series-connected trigger, multivibrator waiting and key, whose output is connected to the recording winding of the multistable memory transformer, as well as the transformer connected to the input winding of the multistable memory transformer. Moreover, the storage capacitor is connected to one of the key inputs, and the input windings of the transformer are connected to the weight sensor. Practical value. The use of the presented device allows for operational control of the nominal load of the dump truck, objective accounting of transported cargo and realized labor costs, as well as for applying optimal maintenance of cargo and transport works in quarries. In the future, this device will form the basis of a radio telemetry system for dispatching the operation of dump trucks.
Environmental toxicity assessment of mining waste from an abandoned Zn-Pb mine
Authors: Hamrani F , Boutaleb A , Hamou M. Ould , Merchichi A , Bouras A , Babczynska A
Published: August 2024

Purpose. To assess the impact of mining waste on the heavy metal content of water surfaces, plants, and topsoil near the tailings dam of a Zn-Pb mine using both biotests and analytical methods. Methodology. A battery of microbiotests on different animal and plant species was carried out, making it possible to evaluate the toxic effect of residues and surrounding soils on living organisms. Furthermore, the possible relationship between the observed toxicity and the results of the physicochemical analysis of the samples was studied. Findings. The tests showed that the topsoil in contact with the tailings dam is slightly toxic to the living organisms used while the mining tailings are toxic or even very toxic. The heavy metal content of the samples is particularly high for Fe, Zn, Pb and Cu. The correlation of physic-chemical parameters and the results of microbiotests using the principal components analysis (PCA) and the multiple correspondence factor analysis (MCFA) indicate that the toxicity of tailings and the surrounding topsoil can be associated with anthropogenic mining activity. Originality. The study aimed to assess the impact of mining waste on the heavy metal content using biotests and analytical methods. The evaluation considers the concentrations of the samples (highly concentrated samples and samples after dilution) and the different phases of exposure (solid, liquid) for a more detailed assessment of the potential toxicity of the samples. Practical value. It is important to conduct a comprehensive assessment of mining waste and the risks it may pose to humans and the environment in order to develop an adequate rehabilitation plan.
On the issue of load’s external ballistics under low-speed transportation
Authors: Aziukovskyi O. O , Gryshchak V. Z , Ziborov K. A , Fedoriachenko S. O , Harkavenko D. V
Published: August 2024

Purpose. Solution of the three-dimensional nonlinear problem of external ballistics and development of an approximate mathematical model of the dynamic process for cargo falling from low-speed aircraft, which makes it possible to obtain an analytical solution, which is possible in combination with a geometric representation of the dynamic process using computer algebra. Methodology. Utilizing a blend of analytical and numerical research algorithms, an innovative model was devised, grounded in a nonlinear system of differential equations characterized by time-varying coefficients. The applied three-dimensional approach to the dynamic problem with an initial velocity from a UAV, in the presence of frontal and side wind loading, made it possible to use the nonlinear theory of external ballistics. This streamlining of the problem involved solving a related system of differential equations with variable coefficients along corresponding coordinates, leveraging an asymptotic approach. Furthermore, the formulation of the problem incorporated applied mathematical analysis and modeling, accommodating various pertinent environmental parameters. Findings. The creation of mathematical models and algorithms for calculating the parameters of the dynamic process of falling loads from low-speed aircraft within the framework of the theory of nonlinear external ballistics is an urgent problem both from the point of view of the development of the dynamic theory of the specified class of systems, and the creation of effective calculation algorithms with the possibility of practical application. As a result of the research, characteristic valuations of the influence of variable coefficients on the results of estimated accuracy of landing as a derivative of time were obtained. The obtained analytical and graphical dependences with the provision of appropriate assessments of the applied approach make it possible to establish the correlation of methods and results. Originality. The relevance of scientific research in the field of nonlinear external ballistics is based both on the internal trends of the development of this science and on the urgent needs of modern industry. In this paper, an approximate analytical solution of the nonlinear problem of external ballistics is proposed, which is subject to the applied conditions of motion. The resulting dependencies made it possible to establish the relationship between the parameters and find the degree of their influence on the landing time function. Practical value. The derived analytical findings and solution methodology can be integrated into practical applications within the realms of mathematical physics and engineering computations. This is particularly pertinent in the advancement of control algorithms for ballistic systems.
Measurement of Axial Length in the Calculation of Intraocular Lens Power for Biometry
Authors: Abedin Md Jainal , Dhali Balayat Hossain
Published: August 2024

Background: Intraocular Lenses (IOLS) are permanent artificial lenses that can replace the eye's natural lens to restore both near and distant vision. The aim of the study is to compare the accuracy of a single high quality. A scan measurement with that of the average three acceptable measurements in the calculation of IOL power.
Materials and methods: Studied 180 eyes of 180 patients who underwent IOL surgery. All these patients underwent preoperative ocular biometry. Phacosurgery with posterior chamber intra ocular lens (PC IOL) implantation and clinical refraction was done in all patients between 4 to 12 weeks post operatively. The  duration of the study was from January 2018 to December 2020 at Chittagong Parkview  Hospital Ltd, Chattogram.
Results: There was no significant difference between the two study group in measured  axial length calculated emmertopic IOL power and the prediction of post operative refraction.
Conclusion: The use of single high quality axial  length measurement was as accurate  as the mean of the three acceptable axial length measurement in the calculation of IOL power.
IAHS Medical Journal Vol 6(1), June 2023; 30-33
School closures and student achievement, evidence from a high stakes exam
Authors: Riudavets-Barcons Marc , Uusitalo Roope
Published: August 2024

We study the effect of school closures and the transition from on-site to on-line teaching during the Covid-19 pandemic in the Finnish upper secondary schools. To identify the effects we exploit variation in the length of school closure periods across schools between autumn 2020 and spring 2021. Using a difference-in-difference design, we show that the students who studied on-line for longer periods performed equally well in the Matriculation exam at the end of upper-secondary education than the students who experienced shorter school closures. Moreover, we show that inequalities across Finnish students from different socioeconomic backgrounds did not exacerbate during this period.
PENGARUH KEMAMPUAN REPRESENTASI MATEMATIS TERHADAP KEMAMPUAN PEMBUKTIAN MATEMATIS SISWA
Authors: Wulandari Trisno Siti , Lestari Karunia Eka
Published: August 2024

Kemampuan pembuktian matematis merupakan salah satu kemampuan dasar yang harus dimiliki siswa dalam belajar matematika. Salah satu faktor yang mempengaruhi kemampuan pembuktian matematis yaitu dengan kemampuan representasi matematis. Kemampuan representasi merupakan aspek dalam membangun konsep, memahami konsep, dan mengemukakan ide-ide matematis. Penelitian ini bertujuan untuk mengetahui pengaruh kemampuan representasi matematis terhadap kemampuan pembuktian matematis siswa yang dilihat dari hubungan linier dan seberapa besar pengaruh kemampuan representasi matematis dalam menjelaskan variabilitas kemampuan pembuktian matematis. Pendekatan yang digunakan adalah pendekatan kuantitatif dengan metode penelitian korelasional. Sampel pada penelitian ini terdiri dari 35 siswa dari salah satu kelas X TKJ di SMK PGRI 2 Karawang yang dipilih secara acak dengan menggunakan teknik cluster random sampling. Instrumen yang digunakan untuk mengumpulkan data yaitu berupa instrumen tes dan analisis yang digunakan yaitu analisis regresi sederhana. Hasil penelitian ini, berdasarkan pada taraf signifikan 95%, memiliki cukup bukti untuk menunjukkan terdapat hubungan yang linier dan signifikan antara kemampuan representasi matematis terhadap kemampuan pembuktian matematis dengan besar pengaruh 46,2%.