bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanical properties and quantum mechanical simulations of natural rubber composites with cerium complexes under aging conditions
Authors: Li Yilin , Liu Yonggang , Hao Wei , Liu Zhaogang , Zhang Wentao , Hu Yanhong , Wu Jinxiu 
Published: May 2024

Abstract
Enhancing the service life of natural rubber (NR) products, including antioxidants, is crucial to prevent rubber degradation and enhance its oxidation resistance. Phenolic antioxidant 2246 and cerium complex of p-amino salicylic acid (PAS-Ce) are utilized as NR antioxidants. Numerous studies have qualitatively analyzed the antioxidant mechanisms of these compounds. Building upon this perspective, this study quantitatively assessed the protective mechanisms of these antioxidants by combining experimental data with molecular simulations. Additionally, it compared their impacts on the thermal oxidative aging performance of NR. The findings revealed that the PAS-Ce/NR system exhibited the highest mechanical performance retention following multiple days of thermal-oxidative aging. Analyzing the PAS-Ce/NR system through ATR-FTIR and DTA techniques demonstrated that it had the lowest C=O content after thermal-oxidative aging. Furthermore, calculating the activation energy required for thermal-oxidative aging decomposition using the Kissinger and FWO methods indicated that PAS-Ce/NR had the highest activation energy, suggesting superior inhibitory effects against thermal-oxidative aging. Quantum mechanical simulations also illustrated that the dissociation energy of the O-H bond in antioxidants 2246 and PAS-Ce was lower than that of the C-H bond in NR. However, PAS-Ce exhibited a quicker capture of radical species, effectively delaying the oxidation reaction rate of NR molecular chains and thus more efficiently inhibiting the aging process. These insights contribute significantly to comprehending the antioxidative mechanisms in NR aging.
Modeling The Volatility Of EUR/CHF Exchange Rate in The Albanian Market: An Approach Using Latent Likelihood
Authors: Todri Ardita , Biçoku Jonida 
Published: May 2024

Objective: The objective of this study is to estimate the volatility of the EUR/CHF exchange rate in Albanian market, with the purpose of forecasting it within a short time frame of one day. This is particularly important given the interesting fluctuations observed in the past year. Such information is crucial for economic agents who face exposure to this specific exchange risk, as both EURO and CHF are widely used and strong European currencies within the country.

Theoretical Framework: This topic covers studies that incorporate modifications to standard deviation errors in autoregressive models and those that address autocorrelated errors using varying variance models.

Method: The study employs the ARMA (1;1), ARCH (1;1), and GARCH (1;1) models to calculate the EUR/CHF volatility with a 95% confidence level. It employs daily EUR/CHF exchange rates, denominated in ALL, from May 4, 2022, to April 28, 2023. This period encompasses a total of 245 observations.

Results and Discussion: The results suggest that both the ARMA (1;1) and ARCH (1;1) models were inadequate in accurately estimating the volatility of the EUR/CHF exchange rate. This discrepancy is likely due to latent factors that impact volatility within the Albanian market. In contrast, the GARCH (1;1) model proved effective in capturing EUR/CHF exchange rate volatility.

Research Implications: The GARCH (1;1) model is implemented using the moving window method over a one-day timeframe. To forecast the EUR/CHF exchange rate on 02/05/2023, we utilize 244 data points spanning from 04/05/2022 to 28/04/2023. This process is repeated for the entire period from 02/05/2023 to 30/04/2024.

Originality/Value: The study evaluates the statistical robustness of three dynamic models to accurately estimate EUR/CHF exchange rate volatility in the Albanian market, filling a gap in existing literature. It provides future predictions for the EUR/CHF exchange rate within a one-day timeframe by utilizing findings from the precise GARCH (1;1) model. Moreover, the research conducts to Value at Risk (VaR) calculations, enhancing its relevance for informing risk management strategies in the Albanian market.
Normative Basis For The Implementation of Telework in A Public Productive Company of The Enery Sector
Authors: Raya Erick Hernández , García Roman Alberto Quijano , Cortés Roger Manuel Patrón , Chuc Giselle Guillermo , Martínez Fidel Ramón Alcocer 
Published: May 2024

Objective: The objective of this research is to establish the normative basis for the development of teleworking according to the needs of the organization and collaborators, since as result of SARS CoV-2 pandemic, the benefits of its implementation in a planned and structured way were identified.

Theoretical Framework: The main characteristics of teleworking were analyzed, as well as the advantages it offers for workers, organizations, and society, evaluating its context from Mexico and internationally.

Method: The methodological design used is nested case with illustrative type, since it presents or exemplifies the phenomenon that is investigated under a specific theoretical approach made up of a single case (federal public organization), with more than one unit of analysis: teleworking and regulations. The administration and operation of the Southeast Transmission Division of the Federal Electricity Commission (CFE), the problem of teleworking and the normative basis for its implementation in Campeche were studied to establish operational viability in the administrative staff in benefit of continuous electrical energy service delivery to the population and companies.

Results and Discussion: The results of the intervention revealed the benefits of teleworking when its implementation is based on the legal bases in accordance with the needs of the organization and collaborators, particularly unionized workers whose labor methodology is generally to perform on-site and not from home. The results indicate that the planned implementation has a positive impact on the labor efficiency and productivity, considering that the unit of analysis was studied under the case method.

Research Implications: One of the relevant factors for a successful implementation is resistance to change the way of how processes are executed and the implicit costs of the use of technology and the investment in equipment to perform activities in other places than central offices. The exhaustive analysis of the labor and productive benefits for all the agents facilitates the successful implementation in national organizations.

Originality/Value: This research contributes to literature by analyzing the advantages and disadvantages of the implementation of new work schemes in public organizations where processes are always intentionally executed in the office, and where the staff shows resistance to new ways to do their own activities under the conditions established by the union of workers.
Cash Flow and Its Components in Investment Valuation
Authors: Pereira Alfredo Vicente , Dias Rui , Galvão Rosa , Varela Miguel 
Published: May 2024

Objective: The objective of this study is to provide a reflection on concepts and techniques used in investment analysis and evaluation with the aim of contributing to their clarification, as well as their practical application.

Theoretical Framework: The article begins with a brief review of the literature on the concept of cash flow, continuing with the suitability of the concept in investment analysis and a detailed analysis of its components from a theoretical and practical point of view, in the context of investment appraisal.

Method: The descriptive research method was used, as it is the most appropriate to the objective, making it possible to analyze the values relating to an investment project, as a way of demonstrating the validity and relevance of the concepts presented.

Results and Discussion: Details are given of how the periodic cash flow portions are constructed, how the value of the components is determined for the times after the time of analysis and their transformation into equivalent values that make it possible to transform the periodic values into the project's cash flow.

Conclusion: The concept of cash flow was discussed and clarified, emphasizing the temporal consideration of periodic non-addable cash flows. An example was given of how periodic cash flows can be determined beyond the study periods in concrete situations involving investments in real assets.
The Antecedents and Consequences Pertaining to the Intention to Engage in Philanthropic Activities
Authors: Ulza Emaridial , Kuncoro Engkos Achmad , Furinto Asnan , Mariani Minsani 
Published: May 2024

Purpose: The objective of this study is to examine the extent to which the advancement of this theory can shape philanthropic intentions and directly influence philanthropic activities in Indonesia.

Theoretical Framework: There is an expectation that this theoretical framework will offer a resolution to the issue of philanthropy in Indonesia, which has thus far fallen short of achieving the desired philanthropic potential of 200 trillion Indonesian Rupiah. The role of non-profit institutions in soliciting donors to facilitate philanthropic endeavours, which in turn contribute to economic and social development in Indonesia, is currently not substantial. This is in contrast to the global agenda set by the Sustainable Development Goals (SDGs).

Methods: The research focuses on examining the population of donors from various generations. The criteria for selecting the sample include identifying the province with the highest level of generosity and ensuring representativeness. Additionally, the study pays attention to the level of object funding. The purposive sampling method is employed to select participants, and the analysis design involves the use of multivariate Structural Equation Modelling (SEM).

Results: This study focuses on the examination of generosity in Indonesia through the lenses of many theoretical frameworks, including generosity theory, planned behaviour theory, brand theory, social identity theory, and need of affiliations.

Conclusion: This study will hopefully provide advantages from both theoretical and scientific perspectives. The acquisition of knowledge and the cultivation of scientific reasoning are crucial in advancing our understanding of various concepts within the field of marketing.
Analisis Kesalahan Sintaksis Bahasa Indonesia Dalam Karangan Deskripsi Siswa Kelas Tinggi yang Berbahasa Ibu Bahasa Batak
Authors: Juliana Eva , Nasution Afrilliani , Apleni Rima , Syahriani Rica 
Published: May 2024

Salah satu tujuan dari penelitian ini adalah untuk (1) menjelaskan jenis kesalahan sintaksis yang terjadi pada kalimat tunggal dalam karangan deskripsi yang ditulis oleh siswa yang memenuhi standar akademik tinggi, dan (2) menjelaskan jenis kesalahan sintaksis yang terjadi pada kalimat majemuk yang ditulis oleh siswa yang memenuhi standar akademik tinggi. Penelitian ini adalah penelitian kualitatif. Penelitian ini melibatkan siswa kelas tinggi yang berbahasa ibu Batak. Data yang digunakan dalam penelitian ini adalah kalimat tunggal dan majemuk bahasa Indonesia yang melanggar bahasa pada tataran sintaksis dalam karangan bebas mereka. Hasilnya menunjukkan bahwa 13 dari 18 siswa, atau 72 persen dari siswa, melakukan kesalahan dalam karangannya. Hasil penelitian menunjukkan bahwa siswa kelas tinggi yang berbahasa ibu Batak melakukan kesalahan sintaksis pada satu kalimat tunggal. Kesalahan sintaksis tersebut adalah (1) kalimat yang tidak gramatikal, (2) kalimat yang tidak padu, (3) kalimat yang tidak efektif, dan (4) kalimat yang dipengaruhi oleh bahasa Batak. Kesalahan sintaksis pada kalimat majemuk setara adalah (1) kalimat majemuk setara yang tidak gramatikal, (2) kalimat majemuk setara yang tidak padu, dan (3) kalimat majemuk setara yang tidak efektif, dan (4) kalimat majemuk setara. Kata kunci: kesalahan sintaksis, karangan bahasa Indonesia, bahasa ibu bahasa Batak
PENERAPAN MODEL STAD UNTUK MENINGKATKAN HASIL BELAJAR PADA MATA PELAJARAN IPA KELAS VB SDIT INSANTAMA
Authors: Marsambas Marsambas , Mastori Mastori 
Published: May 2024

This research was motivated by the finding of the VB SDIT Insantama class when a science lesson on Respiratory Organs in Ruminant Animals, that 83.87% of students had not been able to reach the KKM or 16.13% of students had reached the KKM. So it is categorized as low learning outcomes. The aim of this learning improvement is to improve science learning outcomes through the application of the STAD Model Cooperative Learning Strategy. This research took place at SDIT Insantama Bogor. The research subjects were Class VB students with a total of 31 students. Implementation was carried out in two cycles, with a pre-cycle being carried out previously. The pre-cycle was held on August 24 2021. The first cycle was carried out on September 7 2021 and the second cycle was carried out on September 14 2021. The results showed an increase, the average value in the pre-cycle was 52.58% to 69.03% in the first cycle and 85.97% in the second cycle. Based on the results, it can be concluded that the implementation of the STAD Model Cooperative Learning Strategy can improve the learning outcomes of Class VB students at SDIT Insantama Bogor for the 2021/2022 academic year. Keywords: Learning Outcomes; STAD; Science.
BALLAST OF ANCIENT MERCHANT SHIPS
Authors: Петровский В.М. 
Published: May 2024

Статья посвящена обзору такого редкого типа археологического памятника как судовой балласт, сброшенный на дно моря на месте стояки древнего судна. Данный тип памятника часто встречается в районах древних портов Средиземного моря, тогда как в Северном Причерноморье в настоящее время выявлен всего один объект такого рода.
The paper analyzes the finds of ballast stones of merchant ships dating from ancient times. This is a rare archaeological find, which is sometimes found near the ancient harbors of the Mediterranean Sea, but only one object of this kind has been identified in the Northern Black Sea region.
ANALYTICAL STUDIES AND TYPOLOGICAL ATTRIBUTION OF THE ARSENICAL BRONZE KNIFE FOUND NEAR THE ERLYGAS SETTLEMENT, CHELYABINSK REGION
Authors: Петров Ф.Н. , Анкушев М.Н. , Блинов И.А. , Артемьев Д.А. 
Published: May 2024

Бронзовый нож, найденный в ходе разведочных работ в Кизильском районе Челябинской области, был изучен методами РФА, РЭМ-ЭДА и LA-ICP-MS. Установлено, что нож изготовлен из бронзы с высоким содержанием мышьяка 6,3 мас. %) и заметной долей никеля (0,24 мас. %). Выявленный комплекс маркирующих примесей Fe-Co-Ni-As-Sb с повышенными содержаниями коррелирующих с ними золота, серебра, селена и теллура по большинству элементов согласуется с наиболее распространенным составом микропримесей синташтинского металла. Отсутствие в составе значимых содержаний олова и свинца, скорее всего, указывает на уральский источник медной руды; почти весь спектр примесных элементов (Fe, Ni, Co, Sb, Au, Se, Te) может быть связан с добавками мышьяковистых руд из ультрабазитов в относительно чистую медную руду. Типологический анализ и данные о составе металла позволяют предположить, что нож был изготовлен металлургами синташтинской культуры.
NEW RESULTS OF RADIOCARBON DATING OF THE FINDS FROM THE SCYTHIAN AND SARMATIAN SITES IN THE COLLECTION OF THE STATE HISTORICAL MUSEUM
Authors: Фирсов К.Б. , Строков А.А. , Киселева Д.В. 
Published: May 2024

Статья посвящена анализу результатов AMS-датирования органических углеродсодержащих остатков из погребальных комплексов раннего железного века из собрания Исторического музея. Современная методика ускорительной масс-спектрометрии позволяет исследовать небольшие образцы, в результате чего получаются достаточно узкие доверительные интервалы. В качестве объектов исследования были отобраны органические остатки из погребений известных памятников «савромато»-сарматского времени - могильников Мечет-Сай, Герасимовка, Увак, скифского царского кургана Козёл, а также из могильника у ст. Тифлисской («Золотое кладбище»). Были исследованы остатки дерева, кожи и меха (древки стрел, детали колчанов, навершие, футляры зеркал). Выполнены определения пород древесины, а также проведен технологический анализ меховых и текстильных фрагментов. В ряде случаев результаты исследований позволяют значительно сузить или подтвердить датировки комплексов, полученных традиционными археологическими методами, в том числе даже для памятников скифской эпохи, несмотря на существование проблемы «гальштатского плато».
he paper analyzes results of the AMS-dating of organic carbon-containing remains from the Early Iron Age funerary assemblages in the collection of the State Historical Museum, Moscow. Modern methods of accelerator mass-spectrometry provide an opportunity to study small specimens helping obtain rather narrow reliable intervals. Organic remains from the graves at well-known Sauromatian-Sarmatian sites, namely, the Mechet-Sai, Gerasimovka and Uvak cemeteries, the Scythian royal kurgan known as Kozel as well as the cemetery near the Tiflisskaya Cossack village (Gold Cemetery) were selected as specimens. Remains of wood, leather and fur (arrow shafts, parts of quivers, a finial and mirror cases) were carefully examined. The project included determination of tree species, and technological analysis of the fur and textile fragments. In some cases, the data obtained through these analyses help substantially narrow down or confirm the dating of the assemblages estimated using traditional archaeological methods, even the dating of the assemblages from the Scythian sites despite the issue of «the Hallstatt plateau».
ОСОБЕННОСТИ ХИМИЧЕСКОЙ ИОНИЗАЦИИ ПРИ АТМОСФЕРНОМ ДАВЛЕНИИ МЕТИЛФОСФОНИЛДИФТОРИДА И O-ИЗОПРОПИЛМЕТИЛФТОРФОСФОНАТА В СПЕКТРОМЕТРИИ ИОННОЙ ПОДВИЖНОСТИ С ИСПОЛЬЗОВАНИЕМ ГИДРАТИРОВАННОГО АММОНИЯ В КАЧЕСТВЕ ИОНА-РЕАГЕНТА
Authors: А.В. Лебедев , И.В. Рыбальченко 
Published: May 2024

С помощью квантово-химических расчетных методов исследована химическая ионизация при атмосферном давлении (ХИАД) метилфосфонилдифторида (МФД) и O-изопропилметилфторфосфоната (ИМФФ) гидратированным аммонием, NH4+(H2O), ионом-реагентом, широко применяемым в спектрометрии ионной подвижности. Рассчитана структура нейтральных и протонированных молекул МФД и ИМФФ, их энергия сродства к протону и газофазная основность. Вычислены термодинамические параметры возможных реакций МФД и ИМФФ с гидратированным аммонием. Показано, что протекают существенно экзоэргонические реакции ассоциации и замещения лиганда. Ионами-продуктами являются гидратированные и негидратированные мономеры NH4+(H2O)B и NH4+B и димеры NH4+(H2O)B2 и NH4+B2соответственно (B = МФД или ИМФФ). Протонированные молекулы BH+ не образуются ввиду значительной эндоэргоничности реакций переноса протона. Определен изомерный состав гидратированных мономеров и димеров. Найдено два, три, семь и 28 изомеров NH4+(H2O)МФД,NH4+(H2O)(МФД)2, NH4+(H2O)ИМФФ и NH4+(H2O)(ИМФФ)2 соответственно. Установлено, что наиболее устойчивы изомеры с водородными связями между фосфорильными атомами кислорода МФД (ИМФФ) и атомами водорода иона аммония. В результате отщепления молекулы воды от наиболее устойчивых изомеров гидратированных мономеров и димеров образуются негидратированные мономеры и димеры с более прочной водородной связью. Вычислен равновесный выход ионов-продуктов для различных условий в реакционной зоне ионно-дрейфовых трубок. Установлено, что практически 100 %-ный выход и специфичное обнаружение низких (6 × 10–3 мг м–3) концентраций МФД и ИМФФ (когда значителен выход и мономеров, и димеров) могут достигаться при условии создания в реакционной зоне довольно сухого воздуха (с концентрацией паров воды 1 ppm) и температуры не более примерно 70 °C. С помощью расчетов показано, что с увеличением концентрации паров воды на несколько порядков (что характерно для прямого ввода проб атмосферного воздуха) выход ионов-продуктов должен снижаться и соответственно увеличиваться порог обнаружения (особенно значительно для МФД). В согласии с экспериментальными данными вычисленный порог специфичного обнаружения МФД при прямом вводе проб возрастает до ~6 мг м–3, что на два порядка больше, чем для ИМФФ (~6 × 10–2 мг м–3). Для преобладающих ионов-продуктов вычислены приведенные подвижности, которые согласуются с экспериментальными значениями.
IDENTIFIKASI STRUKTUR EKONOMI SEKTORAL DAN REGIONAL SELURUH PROVINSI DI INDONESIA MENGGUNAKAN ANALISIS NETWORK
Authors: Pasaribu Lamtutur Sri Paulina 
Published: May 2024

This study aims to identify key sectors in the economy of all provinces in Indonesia by network analysis using Indonesia's Inter-Regional Input-Output (IRIO) tables. The results of this study show that the most sensitive sector and the sector with the highest ranking in terms of having relationships with other important sectors are the manufacturing industry and its region is dominated by provinces on the island of Java. Furthermore, the sectors with the highest ratings in terms of their ability to influence resources among other sectors are the manufacturing, construction, transportation, and warehousing industries, and financial services and insurance sectors. As well as the results of community detection show that sectors that are in the same province and have close geographical distances tend to interact more often. The results of this study also show that the highest rankings of the sector as a whole are dominated by provinces on the island of Java while the lowest is by the Eastern Part of Indonesia.