bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel ultra-wideband end-fire antenna based on spoof surface plasma polaritons
Authors: Yan Bao , You-bao Wang , Tian-hao Zhang , Liu-yisi Zhao 
Published: October 2024

Abstract
A novel ultra-wideband end-shot antenna based on artificial surface-isolated excitations (SSPP) is designed. The antenna adopts a coplanar waveguide structure and introduces an SSPP transmission line consisting of a symmetric exponential Gaussian curve reference ground and an elliptical aperture-type cell, which effectively improves the bandwidth of the SSPP antenna and realizes the high-frequency operating characteristics of this antenna. In addition, the design combines the asymmetric structure of the SSPP transmission line and the guided branch structure to enhance the directivity of the antenna. The measured results of the antenna show that the antenna operates in the bandwidth range of 21.5–34.0 GHz, and the average gain of the antenna in the whole operating bandwidth range reaches 9.4 dBi, and the average radiation efficiency is 92.6 %, which can be better applied in the field of high-frequency communication.
Product Oversight and Governance’s Actual Trends and Value for Money Provisions Within the IDD Framework
Authors: Petrosino Francesco 
Published: October 2024

Abstract
The article focuses on the renewed discipline of product oversight and governance in insurance law. Specifically, the contribution examines the significance of the value for money principle, which, through acts by the European Insurance and Occupational Pensions Authority (EIOPA), has had a considerable impact on the organization of insurance companies as well as on the policies ultimately distributed. Regarding the structure of the article, the first part addresses the contractual characterization provided by the Court of Justice of the European Union (CJEU) of so-called IBIPs (investment-based insurance products), for which the value for money principle is particularly impactful. The second part of the article focuses on the operation of product oversight and governance and the influence of the value for money principle on it. Finally, the last part of the analysis centers on the relationship between the CJEU’s precedents and their integration into the harmonizing policy conducted by European institutions, which inevitably also affects the field of financial and insurance law.
An updated review on carbon nanomaterials: Types, synthesis, functionalization and applications, degradation and toxicity
Authors: Roy Arpita , Gupta Aaryan , Haque Benazeer , Qureshi Absar Ahmed , Verma Devvret , Sharma Kuldeep , Lee Siaw Foon , Hee Cheng Wan , Roy Amit , Verma Rajan 
Published: October 2024

Abstract
As carbon-based nanomaterials have such remarkable physical, chemical, and electrical capabilities, they have become a major focus of materials science study. A thorough examination of several carbon nanomaterial varieties, such as carbon nanotubes, graphene, fullerenes, and carbon nanodiamonds, is given in this review work. These materials all have distinctive qualities that qualify them for particular uses. This work starts by examining the synthesis processes of these nanomaterials, outlining the ways by which they are made and the variables affecting their ultimate characteristics. The specific features of each kind of carbon nanomaterial will then be briefly discussed in this study, along with their size, structure, and special physical and chemical properties. These materials have a wide range of possible uses in several fields. They are employed in the electronics industry to fabricate sensors, high-speed transistors, and other devices. Their high surface area and electrical conductivity make them useful in energy storage devices like supercapacitors and batteries. They are applied to environmental remediation and water purification in environmental science. They are employed in biomedicine for biosensing, bioimaging, and medication delivery. Notwithstanding the encouraging uses, the large-scale synthesis and functionalization of carbon nanomaterials present several difficulties. This review discusses the importance of carbon nanomaterials by studying their multifaceted properties and potential applications in industries. The novelty of this work lies in its detailed examination of the degradation and toxicity of these materials, which is essential for their safe integration into various technological and biomedical applications. By thoroughly analysing recent experimental results, this review aims to bridge the gap between fundamental research and practical applications.
Structural, rheological and thermal properties of crude palm oil obtained in pressed, sifted and clarification stages using ultrasound-assisted
Authors: Campo-Vera Yesenia , Gelvez Victor M. , Murillo Edwin A. 
Published: October 2024

Abstract
Crude palm oil (CPO) is commonly used in the oil industry. This study presents a comparison of the structural, rheological, and thermal properties of clarified CPO (CCPO) sample obtained using the conventional method and ultrasound-assisted (UA)-treated samples. These samples were obtained in the pressed (press liquor, PL), sifted (sifted liquor, SL), and clarification (outlet sludge, OS) stages. The frequencies used for the UA-treated samples were 40 and 80 kHz for 30 min. The PL and SL samples exhibited higher resistance to oxidative deterioration and nutritional quality than the CCPO sample did. The maximum oil extractability percentage (OEP) of the UA-treated samples relative to that of CCPO was 7.4 %. The bleachability index (DOBI) values of the UA-treated samples were higher (between 2.06 and 2.58) than that of the CCPO sample (1.43). However, the viscosity (η) displayed opposite trend. The thermal stability did not exhibit consistent patterns with increasing frequency.
Comparison of cord blood alarin levels of full-term infants according to birth weight
Authors: Buyukeren Melek , Ozcan Beyza , Can Ummugulsum , Kenar Aytac , Kececi Ramazan , Bayman Melike Geyik , Gunenc Oguzhan 
Published: October 2024

Abstract

Objectives
To compare the cord blood alarin levels of infants in different birth weight groups with those of infants born to mothers diagnosed with gestational diabetes mellitus (GDM) who were not subgrouped according to birth weight.

Methods
This prospective study was conducted between September 2023 and January 2024. Healthy term babies whose families agreed to participate in the study were divided into four groups according to their birth weight (small for gestational age (SGA), appropriate for gestational age (AGA) and large for gestational age (LGA)) and whether their mothers had GDM.

Results
There was a significant difference between the cord blood alarin levels of the AGA and SGA groups (p=0.014). There was also a significant difference between the cord blood alarin levels of the AGA and GDM groups (p=0.012). However, the cord blood alarin levels of the LGA group (whose mothers did not have GDM) were similar to those of the AGA group (p=0.394).

Conclusions
We found evidence that alarin levels in umbilical cord blood are associated with low birth weight and GDM.
Thermally tunable add-drop filter based on valley photonic crystals for optical communications
Authors: Sun Lu , Li Xingfeng , Hu Pan , Wang Hongwei , Zhang Yong , Tang Guojing , He Xintao , Dong Jianwen , Su Yikai 
Published: October 2024

Abstract
Valley photonic crystals (VPCs) provide an intriguing approach to suppress backscattering losses and enable robust transport of light against sharp bends, which could be utilized to realize low-loss and small-footprint devices for on-chip optical communications. However, there are few studies on how to achieve power-efficient tunable devices based on VPCs, which are essential for implementing basic functions such as optical switching and routing. Here, we propose and experimentally demonstrate a thermally tunable add-drop filter (ADF) based on VPCs operating at telecommunication wavelengths. By leveraging the topological protection of the edge state and the distinct property of negligible scattering at sharp bends, a small footprint of 17.4 × 28.2 μm2 and a low insertion loss of 2.7 dB can be achieved for the proposed device. A diamond-shaped microloop resonator is designed to confine the light and enhance its interaction with the thermal field generated by the microheater, leading to a relatively low power of 23.97 mW needed for switching the output signal from one port to the other. Based on the thermally tunable ADF under the protection of band topology, robust data transmission is implemented with an ultrahigh data rate of 132 Gb/s. Our work shows great potential for developing high-performance topological photonic devices with the thermally tunable silicon-based VPCs, which offers unprecedented opportunities for realizing topologically protected and reconfigurable high-speed datalinks on a chip.
Étude comparée du sentiment d’efficacité personnelle, du stress et de la satisfaction au travail entre les personnes enseignantes détenant ou non le brevet en enseignement
Authors: Beaudoin Manon , Granger Nancy , Lessard Anne 
Published: October 2024

Le sentiment d’efficacité personnelle et le stress déterminent la satisfaction au travail. Ces constats ont été bien documentés pour les personnes ayant le brevet d’enseignement, mais ils le sont moins pour celles qui ne le détiennent pas encore, de plus en plus nombreuses dans les écoles. Cette étude par questionnaire a comparé le sentiment d’efficacité personnelle, le stress et la satisfaction au travail de personnes détenant un brevet (n=144) ou non (n=369). Les analyses par test t montrent des différences significatives entre ces groupes : les personnes ayant leur brevet ont un plus grand sentiment d’efficacité, mais rapportent vivre plus de stress et moins de satisfaction au travail. Seules certaines sous-échelles du sentiment d’efficacité et de stress prédisent la satisfaction au travail.
МЕТОДИЧЕСКИЕ ОСНОВЫ ОБЕСПЕЧЕНИЯ УСТОЙЧИВОСТИ УСТУПОВ И УЧАСТКОВ БОРТОВ КАРЬЕРОВ
Authors: В.Л. ЯКОВЛЕВ , А.В. ЯКОВЛЕВ , Е.С. ШИМКИВ 
Published: October 2024

Для обоснования условий обеспечения устойчивости уступов и участков бортов карьеров приведены этапы развития соответствующей нормативной базы. Рассмотрены дополнительные факторы, влияющие на устойчивость уступов и участков бортов карьеров в гравитационно-тектоническом поле напряжений. Представлены основные направления изучения прибортовых массивов на действующих карьерах и показана необходимость определения тектонических напряжений в прибортовых массивах скальных горных пород и учета их воздействия на устойчивость карьерных откосов. Разработан алгоритм обоснования параметров уступов и участков бортов карьеров в тектонически напряженных массивах горных пород, сформулированы принципы ведения буровзрывных работ в приконтурных зонах и способы уменьшения воздействия взрывных работ на законтурный массив.
The article describes the development stages of an adequate regulatory structure for the slope stability in open pit mines. Some supplementary factors that have influence on stability of slopes in open pit mines in the gravity-tectonic stress field are discussed. The main trends of research of pitwall rock mass in operating surface mines are presented, and the necessity of determining the tectonic stresses in pitwall rock mass and taking into account their impact on slope stability is emphasized. The algorithm is developed for justifying slope parameters for open pit mines under tectonic stresses, the drilling-and-blasting principles are formulated for the operation in pitwall rock mass, and the methods are proposed to mitigate the blasting-induced impact on adjacent rocks.
РАСЧЕТ ТЕРМОНАПРЯЖЕННОГО СОСТОЯНИЯ МАССИВА ГОРНЫХ ПОРОД В ОКРЕСТНОСТИ ОЧИСТНЫХ ВЫРАБОТОК
Authors: В.М. СЕРЯКОВ 
Published: October 2024

Рассмотрена постановка задачи об определении теплового и напряженно-деформированного состояния породного массива при ведении горных работ на больших глубинах. Предложен подход к определению стационарного поля температур, возникающих в районе отработки запасов полезных ископаемых с закладкой выработанного пространства твердеющими смесями, с однократным формированием матрицы жесткости расчетной системы. Установлено, что учет изменения температуры в массиве с глубиной приводит к увеличению исходных горизонтальных напряжений, а исходные вертикальные напряжения не изменяются. Метод расчета перераспределения напряженного состояния массива горных пород в ходе ведения очистных и закладочных работ, в котором на всех этапах расчета используется одна и та же матрица жесткости, модернизирован для случая учета температурных напряжений. Проведены расчеты теплового и напряженного состояний породного и закладочного массивов для одного из вариантов отработки пологопадающего рудного тела с закладкой выработанного пространства.
The article addresses the problem on thermal stresses and stress-strain behavior of rock mass during deep-level mining. The author proposes an approach to determining the stationary field of temperatures in the zone of mining with cemented paste backfill with single formation of stiffness matrix in the calculation. It is found that inclusion of the temperature change depthward rock mass in the analysis results in the increase in the initial horizontal stresses while the initial vertical stresses remain unaltered. The calculation method of stress redistribution in the course of mining with backfill, with the same stiffness matrix used at all calculation stages, is modified for taking into account the thermal stresses. The calculation of the thermal stress state of surrounding rocks and backfill is carried out for a variant of mining with backfill in a gently dipping ore body.
ЧИСЛЕННОЕ МОДЕЛИРОВАНИЕ НАПРЯЖЕННО-ДЕФОРМИРОВАННОГО СОСТОЯНИЯ МАССИВА ГОРНЫХ ПОРОД ПРИ ОТРАБОТКЕ НИЖНИХ ПЛАСТОВ СВИТЫ
Authors: С.В. РИБ , О.А. ПЕТРОВА , А.М. НИКИТИНА , В.А. ВОЛОШИН , В.Н. ФРЯНОВ 
Published: October 2024

Описаны особенности отработки свиты угольных пластов. Проведена оценка напряженно-деформированного состояния массива горных пород при отработке нижних пластов свиты с учетом влияния угольных целиков и выработок на верхних пластах. Рассмотрены различные варианты расположения подготовительной выработки на нижнем пласте свиты, охраняемой целиком. Выполнен прогноз напряженно-деформированного состояния массива горных пород, адаптированный к условиям шахт юга Кузбасса, на основе которого осуществляется выбор наиболее безопасного с геомеханической точки зрения варианта расположения подготовительной выработки.
The features of mining of a coal series are described. The stress-strain behavior of rock mass during mining of the lower strata in the series is assessed with regard to the influence of coal pillars and upper level roadways. Different variants of location of a temporary roadway on the lower stratum in a series protected by a pillar are discussed. The implemented prediction of the stress-strain behavior of rock mass is adapted to the conditions of mines in the south of Kuzbass. This prediction is used to select the geomechanically safest variant of location of the temporary roadway.
ТЕОРЕТИЧЕСКОЕ И ЭКСПЕРИМЕНТАЛЬНОЕ ОБОСНОВАНИЕ МЕТОДОВ ПОЛУЧЕНИЯ ВТОРИЧНЫХ ПРОДУКТОВ ИЗ САПОНИТСОДЕРЖАЩИХ ТЕХНОГЕННЫХ ВОД
Authors: В.А. ЧАНТУРИЯ , В.Г. МИНЕНКО 
Published: October 2024

Теоретически и экспериментально обоснованы перспективные методы модификации сапонита - пилларинг и термическая обработка, обеспечивающие получение сорбентов с высокой емкостью катионного обмена по отношению к катионам тяжелых металлов. Механизм пилларинга и термической модификации при температуре 625 °С сапонитсодержащего продукта заключается в расширении слоев минерала, образовании дополнительных кислотных или окислительно-восстановительных центров (пилларинг), в изменении структуры с образованием метастабильных фаз (термическая обработка). Модификация сапонита обеспечивает повышение статической обменной емкости по отношению к катионам меди при пилларинге - в 2 раза, при термической модификации - в 2.6 раза.
The authors provide the theoretical and experimental justification for the effective methods of modification of saponite-pillaring and thermal treatment-which ensure production of sorbents possessing high cation exchange capacity relative to cations of heavy metals. The mechanism of pillaring and thermal modification of a saponite-containing product at the temperature of 625 °С involves expansion of layers of the mineral, formation of additional acid or redox sites (pillaring) and restructuring with generation of metastable phases (thermal treatment). Modification of saponite increases static exchange capacity relative to copper cations by 2 times after pillaring and by 2.6 times after thermal treatment.
ИСПОЛЬЗОВАНИЕ ГЕОПРОСТРАНСТВЕНЫХ ДАННЫХ ДЛЯ ОЦЕНКИ СОСТОЯНИЯ ТЕХНОГЕННО НАРУШЕННЫХ ЗЕМЕЛЬ
Authors: Н.С. КОСАРЕВ , А.А. КОЛЕСНИКОВ , А.В. РЕЗНИК , Н.А. НЕМОВА , Д.С. ОЖИГИН 
Published: October 2024

Предложен порядок получения и интерпретации различными средствами и методами геопространственных данных при ведении горных работ, повышающих точность оценки техногенно нарушенных земель. Разработанный подход базируется на принципе поэтапного перехода от территорий технологических объектов к их отдельным участкам. Показаны примеры интеграции данных спутниковой съемки местности, наземного лазерного сканирования и съемки с беспилотных авиационных систем в цифровые модели местности. Отмечено, что рациональное сочетание различных методов получения и интерпретации геопространственных данных позволяет формировать высокоточную геоинформационную основу цифровых двойников различных объектов, связанных с недропользованием.
The authors propose a sequence of acquisition and interpretation of geospatial data obtained using different methods and means during mineral mining toward the accuracy increase in evaluation of industrially disturbed land. This approach uses the concept of stage-wise transition from the areas of industrial facilities to their individual points. The integration of data of satellite surveys, ground-based laser scanning and unmanned aerial surveillance in the digital models of land areas is described. It is highlighted that the rational combination of different methods of geospatial data acquisition and interpretation produces a high-accurate geoinformation system of digital twins of various subsoil use facilities.
РЕЗУЛЬТАТЫ ВЕРИФИКАЦИИ ТОЧНОСТИ МОДЕЛИ ПРОГНОЗА ПРОЧНОСТИ ОСАДОЧНЫХ ПОРОД ЮЖНОЙ ЯКУТИИ МЕТОДОМ ДИСТАНЦИОННОГО ИНДУКТИВНОГО ЗОНДИРОВАНИЯ
Authors: Л.Г. НЕРАДОВСКИЙ 
Published: October 2024

Рассмотрен результат ретроспективной верификации модели прогноза прочности водонасыщенных осадочных пород, слагающих в Южной Якутии основания инженерных сооружений. Модель разработана для условий г. Нерюнгри. Исходными данными для модели служила мера затухания гармонического поля вертикального магнитного диполя, определенная методом дистанционного индуктивного зондирования на частоте 1.125 МГц. Ошибки модели близки к допустимой ошибке лабораторной оценки средней прочности образцов пород, равной ±20 %. С вероятностью около 70 % ошибки модели в разных условиях строительства и эксплуатации инженерных сооружений составляют ±(16.8-33.5) %. Общая ошибка модели при принятой вероятности равна 27.2 % с максимальным разбросом единичных значений в сторону завышения лабораторной прочности слабых пород на 120.5 % или занижения прочности крепких пород на 86.8 %. Точнее всего (ошибки 22.8 и 21.9 %) задача прогноза прочности решается в условиях преимущественного распространения пород средней (15-50 МПа) и прочной (50-120 МПа) категорий. Полученная статистика доказывает региональный статус модели с практическим применением в Южной Якутии в областях распространения мерзлых высоко- и низкотемпературных осадочных пород с целью быстрого и экономичного решения задачи районирования застраиваемых территорий по категории прочности скально-полускальных грунтов.
This article discusses the results of retrospective verification of the strength prediction model for saturated rocks of southern Yakutia. The model was developed for the geotechnical conditions of the city of Neryungri. The input data for the model consisted of the decay rate coefficients of the harmonic field of a vertical magnetic dipole measured at a 1.125 MHz frequency using the geometric electromagnetic induction sounding method. The error of model predictions was close to the allowable error of ±20 % for average laboratory estimates of rock sample strength and ranged from ±16.8 to ±33.5 % for different site conditions with a probability of about 70 %. The total error of the model at this probability is 27.2 % with maximum outliers overestimating the laboratory strength of weak rocks by 120.5 % or underestimating the strength of strong rocks by 86.8 %. The model predictions were more accurate (errors of 22.8 and 21.9 %) for the rock masses composed predominantly of moderately strong (15-50 MPa) and strong (50-120 MPa) rocks. The statistical results indicate that the model is regionally representative and can be applied in the areas of warm and cold permafrost sedimentary rocks of southern Yakutia for rapid, cost-effective terrain evaluation by rock strength.
ПОДМЕРЗЛОТНЫЕ ВОДЫ СЕВЕРО-ВОСТОЧНОЙ ЧАСТИ ЛЕНО-АМГИНСКОГО МЕЖДУРЕЧЬЯ
Authors: М.А. ФЕДОРОВ , А.А. ФЕДОРОВ , Н.А. ПАВЛОВА 
Published: October 2024

Цель работы состояла в уточнении гидрогеологических условий малоизученной северо-восточной части Лено-Амгинского междуречья. Для этого проведен анализ архивных (1965-1995 гг.) и опубликованных данных о подмерзлотных водах и мощности многолетнемерзлых пород на территории Чурапчинского и Таттинского районов Республики Саха (Якутия), с привлечением новых результатов полевых исследований (2009-2022 гг.). Основой для исследования послужили результаты бурения на подмерзлотные воды 19 поисковых скважин глубиной 450-650 м. Показано различие пьезометрических напоров и дана характеристика химического состава подмерзлотных вод юрского и среднекембрийского водоносных комплексов. Обосновывается смещение ранее установленной границы между этими водоносными комплексами на 50-80 км севернее. Выделена зона с особыми мерзлотно-гидрогеологическими условиями, приуроченная к Татта-Томпонскому тектоническому разлому. Предположительно, дизъюнктив формировался в условиях горизонтального сжатия, что привело к уплотнению пород, их пониженной проницаемости вдоль разлома и увеличению интенсивности промерзания.
The purpose of this work was to specify the hydrogeological conditions in the poorly studied northeastern part of the Lena-Amga interfluve. We analyzed archival (1965-1995) and published data on subpermafrost waters and permafrost thickness in the Churapcha and Tattinsky districts of the Republic of Sakha (Yakutia), including new field studies (2009-2022). The research was based on the data from 19 groundwater exploration wells, 450 to 650 m in depth. It is shown that the Jurassic and Middle Cambrian aquifer complexes differ in piezometric pressures and chemical composition. Based on the new information, it is suggested that the boundary between these two aquifer complexes should be shifted northward by 50-80 km. A zone with distinct specific hydrogeological conditions confined to the Tatta-Tompo fault was identified. Presumably, the fault was formed under conditions of horizontal compression, which resulted in the compaction of the rocks and their reduced permeability along the fault, as well as in the increased freezing intensity in the strata with a low water content during periods of decreased global temperatures.