bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of bell plate structure on high- and low-frequency characteristics of hydraulic mount
Authors: Lin Zhihong , Huang Yuedong 
Published: September 2024

Abstract
This study introduces a novel hydraulic mount designed to achieve broad-spectrum engine vibration isolation. While previous studies have focused on vibration isolation using hydraulic mounts, there is a scarcity of research on achieving wideband vibration isolation with such mounts. To address this gap, this article proposes a new bell plate hydraulic mount structure that includes an inertia channel, a decoupler membrane, and two bell plates. First, the study analyzes the impact of structural parameters on the dynamic characteristics of the new bell plate hydraulic mount across high and low frequencies. Second, it compares how varying the number of bell plates affects the hydraulic mount’s dynamic behavior across different frequency ranges. The findings reveal the following key points: (1) The number of bell plates has minimal influence on the low-frequency dynamic characteristics of the hydraulic mount. (2) Increasing the number of high-frequency bell plates from n = 0 to n = 2 reduces the peak dynamic stiffness of the hydraulic mount by 69.88% and decreases the hysteresis angle by 37.71%. (3) At higher frequencies, the dynamic characteristics of the hydraulic mount are notably influenced by parameters such as the equivalent cross-sectional area A

m2 of the second bell plate, the surrounding equivalent cross-sectional area of the hole A

t2, and the fluid inertia coefficient I

t2 associated with bell plate 2.
Synthesis methods and description for new derivatives associated with 8-hydroxyquinoline and their use as acidic corrosion inhibitors for steel and other alloys: a review
Authors: Rbaa Mohamed , Berdimurodov Elyor , Tüzün Burak , Berdimuradov Khasan , Zarrouk Abdelkader 
Published: September 2024

Abstract
The field of corrosion has recently been considered a productive field for scientific research. With the increasing use of metals in several industrial fields, such as metal construction, the construction of arches and the automobile industry, the problem of corrosion is an important issue. To solve the corrosion problem of metal materials, several methods have been discovered to combat this phenomenon, such as process control, cathodic protection, organic and inorganic coatings. Nonetheless, the presentation of corrosion inhibitors, particularly organic inhibitors, stays the least expensive and simplest technique for the insurance of metals against consumption in acidic media. In this work, it was summed up the strategies for amalgamation and portrayal of newly innovative heterocyclic complexes from 8-hydroxyquinoline, their inhibition performances for M-steel, C40E steel and C35E steel in acidic conditions, for example, hydrochloric acid, sulfuric acid, etc.
Official Misconduct – An Entrepreneurial Explanation
Authors: Sløk-Madsen Stefan Kirkegaard , Jensen Cecilie Barner , Stærk Christensen Trine 
Published: September 2024

Abstract
This article takes a unique perspective on official misconduct, viewing official misconduct as an entrepreneurial manifestation. We propose a typology of misconduct based on discovery and creation, structured around three dimensions that represent entrepreneurial choices to explore or exploit. We empirically apply this typology through an analysis of 11 official misconduct cases in Danish municipalities, a robust institutional context. This research enhances understanding of the relationship between strong institutions and unproductive entrepreneurial behavior, offering practical insights for policymakers and public administrators.
Mongolian Foreign Trade History from the Silk Road
Authors: Jargalsaikhan Tungalag , Ryenchin Sharbandi , Selenge Tuul , Ulzii-Ochir Nomintsetseg 
Published: September 2024

Abstract
Foreign trade is a “mirror” of the historical situation of a country. From foreign trade turnover, trading partners, the structure of export and import goods, and trade flows, it is possible to make conclusions about the country’s industrialization, acquired technology, consumption of the population, the standard of living and development. In this article, we intended to make a conclusion that the characteristics of Mongolia’s social and economic situation, production, trade, and consumption at that time were determined, through the historical conditions of Mongolia’s foreign trade at the beginning of the 20th century, as well as how foreign trade and foreign trade policies influenced the country’s choice of a new path of historical development.
Crystal structure of methyl 1-phenyl-9H-pyrido[3,4-b]indole-3-carboxylate, C19H14N2O2
Authors: Tian Hangzhou , Chen Geyu , Chen Sen , Tang Wenqiang , Liu Bin 
Published: September 2024

Abstract
C19H14N2O2, monoclinic, P21/n (no. 14), a = 11.3111(5) Å, b = 7.2906(3) Å, c = 18.0875(10) Å, β = 102.935(2)°V = 1,453.73(12) Å3, Z = 4, Rgt
(F) = 0.0545, wRref
(F
2) = 0.1389, T = 150 K.
Navigating waves: Advancing ocean dynamics through the nonlinear Schrödinger equation
Authors: Iqbal Ifrah , Boulaaras Salah Mahmoud , Rehman Hamood Ur , Saleem Muhammad Shoaib , Chou Dean 
Published: September 2024

Abstract
The nonlinear Schrödinger equation, held in high regard in the realms of plasma physics, fluid mechanics, and nonlinear optics, reverberates deeply within the field of ocean engineering, imparting profound insights across a plethora of phenomena. This article endeavours to establish a connection between the equation’s theoretical framework and its practical applications in ocean engineering, presenting a range of solutions tailored to grasp the intricacies of water wave propagation. By employing three methodologies, namely, the simplest equation method, the ratio technique, and the modified extended tanh-function method, we delineate various wave typologies, encompassing solitons and periodic manifestations. Enhanced by visual representations, our findings have the potential to deepen the comprehension of wave dynamics, with promising implications for the advancement of ocean engineering technologies and the refinement of marine architectural design.
Demanda de inversión y evaluación de riesgos de proyectos de cooperación en infraestructura entre China y países latinoamericanos y sugerencias relevantes
Authors: Liu Peng 
Published: September 2024

Resumen
Durante mucho tiempo, los países latinoamericanos han enfrentado un déficit en la construcción de infraestructuras, lo cual se ha convertido en un “cuello de botella” que ha restringido su desarrollo económico sostenible. Hasta ahora, aún existe una gran brecha entre la inversión en la construcción de infraestructuras y la demanda en la región, y la calidad de la construcción deja mucho que desear. Comparando los diferentes niveles de riesgos de los proyectos de infraestructuras entre los países de América Latina y China, se revela que el nivel de gestión gubernamental de los proyectos de infraestructuras de China es inferior al promedio de los países latinoamericanos, y que los riesgos en aspectos de mercado, legal y comunitario en China son respectivamente menores que el promedio de los riesgos que las empresas afrontan en los países latinoamericanos. Por lo tanto, China debería aprovechar las oportunidades de recuperación económica post-pandemia de América Latina para explorar de forma dinámica cooperaciones en nuevas áreas de infraestructuras, priorizar la inversión en proyectos de infraestructuras relacionados estrechamente con el bienestar social, y asimismo prevenir efectivamente los riesgos asociados a dichos proyectos.
On the minimum spectral radius of connected graphs of given order and size
Authors: Cioaba Sebastian M. , Gupta Vishal , Marques Celso 
Published: September 2024

Abstract
In this article, we study a question of Hong from 1993 related to the minimum spectral radii of the adjacency matrices of connected graphs of given order and size. Hong asked if it is true that among all connected graphs of given number of vertices

n

n

and number of edges

e

e

, the graphs having minimum spectral radius (the minimizer graphs) must be almost regular, meaning that the difference between their maximum degree and their minimum degree is at most one. In this article, we answer Hong’s question positively for various values of

n

n

and

e

e

, and in several cases, we determined the graphs with minimum spectral radius.
How do AI and human users interact? Positioning of AI and human users in customer service
Authors: Ahn So-Yeon , Kim Seonghoon , Lee Eun-Young , Lee Hyunjong , Song Eun-Young , Song Junehwa , Won Jongseo 
Published: September 2024

Abstract
Situated at the intersection of language, discourse, and communication studies, the present study delves into the dynamics of human-artificial intelligence (AI) interactions. Our study centers on AI-based voice assistants which employ natural language processing to communicate with human users. With a dataset derived from 200 recorded interactions between human users and AI-based voice assistants of a leading Korean telecommunications provider, we investigate the intricate dialogue patterns that emerge within these exchanges. Employing the lens of conversation analysis, especially focusing on adjacency pairs, first pair-part (FPP) and second pair-part (SPP), our analysis elucidates how AI agents and human users negotiate meaning and interactional roles. We identify four distinct response types from the users’ SPP, revealing a variety of interactional patterns. The findings reveal that the users frequently respond to AI-initiated prompts with keywords, reflecting a strategy to efficiently retrieve information, and highlight instances of no verbal response. Additionally, the use of honorifics in Korean AI voice assistants underlines the influence of linguistic and cultural norms on the dynamics of human-AI interaction, emphasizing the need for AI systems to navigate social hierarchies effectively. Our study underscores the importance of enhancing human-AI dialogue and provides valuable implications for interdisciplinary research and practice in the rapidly evolving field of AI-based communication.
The visceral fat area/subcutaneous fat area ratio is positively associated with carotid atherosclerosis in patients with type 2 diabetes mellitus
Authors: Hu Dandan , Cong Xiangguo , Gao Beibei , Wu Ying , Shen Qiong , Chen Lei 
Published: September 2024

Background
Evidence has demonstrated that visceral fat area (VFA) and subcutaneous fat area (SFA) have different influences on cardiovascular disease (CVD) risk in patients with type 2 diabetes mellitus (T2DM). We aimed to investigate the relationship between the visceral fat area (VFA), the subcutaneous fat area (SFA) ratio (V/S), and carotid atherosclerosis (CAS) in patients with T2DM.

Methods
From January 2018 to May 2023, 1838 patients with T2DM admitted to the National Metabolic Management Centre in our hospital were assigned to two groups based on comorbid CAS. Dual bioelectrical impedance analysis was used to measure the VAF and SFA, and the V/S was calculated. Patient characteristics and serum biochemical indices were compared between groups. Factors influencing comorbid CAS were determined, and correlations between V/S and other clinical indices were analyzed.

Results
The group with comorbid CAS included 858 individuals and 980 without comorbid CAS. Those with comorbid CAS were older and had a longer disease duration, more significant systolic blood pressure, and greater V/S. The proportions of patients with comorbid hypertension increased significantly with the V/S ratio. The V/S ratio positively correlated with triglyceride (TG), low-density lipoprotein cholesterol levels, and waist circumference. According to binary logistic regression analysis, V/S was an independent risk factor for CAS.

Conclusion
Elevated V/S is an independent risk factor for CAS in patients with T2DM.
IMPROVEMENT OF MINING AND PROCESSING FLOWSHEETS AT STRUCTURALLY COMPLEX ORE DEPOSITS
Authors: РАССКАЗОВ И.Ю. , ЧЕБАН А.Ю. , ЛИТВИНОВА Н.М. , КОНАРЕВА Т.Г. , АНДРЮЩЕНКО А.С. 
Published: September 2024

Представлены результаты комплексных аналитических исследований и геотехнологического тестирования проб взорванной руды одного из золоторудных месторождений с разделением их по классам крупности. Определены параметры объединенных фракций для переработки по различным технологиям. Разработана схема добычи и переработки руд сложноструктурного выемочного блока. Предложена усовершенствованная технология освоения сложноструктурных месторождений. После селективной выемки руд проводится грохочение с разделением на фракции, обогащенные и обедненные полезным компонентом. Полученные фракции рудной массы шихтуются, при этом шихта с рядовым содержанием полезного компонента перерабатывается с применением флотации, а бедная рудная масса направляется на кучное выщелачивание. Выделенная из богатых руд фракция с повышенным содержанием полезного компонента перерабатывается с применением двухстадийного сорбционного выщелачивания с предокислением, обеспечивающим высокое извлечение металла.
The article describes the integrated analytical studies and geotechnical assaying of blasted ore samples with size classification at a gold deposit. The parameters of mixed fractions for processing using different technologies are determined. The ore mining and processing flowsheet is developed for a structurally complex extraction block. An improved technology is proposed for the structurally complex ore deposit. Selective ore extraction is followed with screening and size classification into fractions with high and low contents of useful component. The fractions are blended, the blend with the high content of useful component is subjected to flotation, and the blend with the low content of useful component goes to heap leaching. The fraction with the increased content of useful component from rich ore is treated by two-stage sorption and leaching pre-oxidation, which ensures high metal recovery.
JUSTIFICATION OF EFFICIENT ENGINEERING DATA FOR MULTI-DRIVE HIGH-DUTY BELT CONVEYORS
Authors: ОРДИН А.А. , НИКОЛЬСКИЙ А.М. , ПОДУГОЛЬНИКОВ Е.В. 
Published: September 2024

Изложена постановка и приведено решение задачи по обоснованию рациональных технических параметров многоприводных высокопроизводительных ленточных конвейеров для транспортирования насыпной угольной массы. Рассмотрены теоретические основы тягового расчета ленточных конвейеров, включающие в себя основное уравнение динамики работы ленточных конвейеров, особенности расчета при стационарном и пусковом режимах работы с учетом кривизны трассы в плане и по профилю. Дано обоснование рациональной ширины ленты и производительности ленточного конвейера. Рассчитаны силы тяги и мощности электродвигателей многоприводного ленточного конвейера. Осуществлена проверка выбранной конвейерной ленты по условиям прочности. Приведен пример расчета с помощью разработанной программы “ЛЕНТА 1.0” многоприводного ленточного конвейера шахты “Инаглинская” Южно-Якутского угольного бассейна.
The authors present the formulation and solution of a problem on the efficient engineering data of multi-drive high-duty belts for bulk coal. The theoretical framework for calculating the belt thrust includes the main equation of the belt conveyor dynamics, and features of calculations in stationary mode and in starting conditions with the regard to horizontal and vertical curvature of the belt route. The rational width and production capacity of a belt conveyor are substantiated. The hauling power and capacity of drives of a multi-drive belt are calculated. The strength test of a selected belt is performed. The calculation using the developed program LENTA 1.0 is presented as a case-study of a multi-drive belt conveyor in Inaglinskaya Mine in the South Yakutia coal field.
FORMATION OF UNDERSPOIL WATER COMPOSITION AT COPPER-PYRITE DEPOSIT IN THE MIDDLE URALS
Authors: РЫБНИКОВА Л.С. , РЫБНИКОВ П.А. , ГАЛИН А.Н. 
Published: September 2024

Рассмотрена концентрация химических элементов в подотвальной воде в зависимости от сезона и климатических условий. Особенности состава подотвальных вод проанализированы по сравнению с химическим составом пород отвала с помощью их водной и кислотной вытяжек. Для большинства изученных элементов наблюдается хорошая корреляция между их содержанием в кислотной вытяжке и содержанием в породе отвала. При этом результаты водной вытяжки не могут использоваться в качестве надежного основания для прогноза состава подотвальных вод.
The authors discuss concentration of chemical elements in underspoil water subject to a season and to climatic conditions. The features of underspoil water composition are analyzed with respect to chemical composition of spoil rocks in water and acid extracts. Majority of the test elements correlate well with their composition in the acid extract and with the spoil rocks composition. The water extract is assumed to be unreliable to predict composition of underspoil water.
Factors Affecting Length of Stay for Children Hospitalized After Pediatric Surgical Procedures
Authors: Berry Jay G. , Staffa Steven J. , Hong Peter , Stringfellow Isabel , Leahy Izabela , Ferrari Lynne 
Published: September 2024

BACKGROUND
Understanding the postoperative length of stay (LOS) by surgical procedure is important for hospital medicine clinicians involved in surgical co-management. We assessed variation in postoperative LOS for children after elective surgical procedures and risk factors for prolonged LOS.

METHODS
This study is a retrospective analysis of pediatric patients undergoing elective surgical procedures between January 1, 2018 and October 1, 2021 with postoperative hospitalization for recovery at a freestanding children’s hospital. The postoperative LOS (number of days) was compared across types of surgery and by the number of chronic conditions (assessed with the Agency for Healthcare Research and Quality Condition Indicator system) using multivariable quantile regression.

RESULTS
The median (interquartile range) LOS across all 347 types of surgical procedures combined was 2 (interquartile range 1–4). Surgical procedures (n = 85) with a median LOS between 3.0 and &lt;5.0 days (eg, spinal fusion, Chiari decompression) accounted for 20.9% of all hospitalizations (N = 12 139) and 23.1% of all postoperative bed days. Procedures (n = 46) with a median LOS of ≥5.0 days (eg, femoral osteotomy, bladder reconstruction) accounted for 15.0% and 46.8% of all hospitalizations and bed days, respectively. After controlling for the type of procedure, having ≥4 (versus none) chronic conditions was significantly associated with experiencing a prolonged LOS (90th percentile: 5.2 days); patients with 4 to 6, versus no, chronic conditions stayed a median of 1.4 (95% confidence interval [CI] 0.7–2.2) days longer, those with 7 to 9 chronic conditions stayed a median of 1.9 (95% CI 1.0–2.7) days longer, and those with ≥10 chronic conditions stayed a median of 4.0 (95% CI 3.3–4.7) days longer.

CONCLUSIONS
Hospital medicine clinicians can use the type of surgery in combination with the number of chronic conditions to estimate postoperative LOS after elective surgical procedures in children.
How to b-Significant When Analyzing b-Value Variations
Authors: Mirwald Aron , Mizrahi Leila , Wiemer Stefan 
Published: September 2024

Abstract
Variations of the b-value of the Gutenberg–Richter law are highly relevant in the context of earthquake forecasting because they directly translate into varying probabilities of future large earthquakes. However, when analyzing a specific earthquake catalog, it is difficult to know whether the observed b-value variation is due to random fluctuation or actual physical changes. We address this problem by developing a simple autocorrelation-based method that can quantify the significance of b-value variation objectively (b-significant). Our synthetic tests reveal that the method performs well at detecting b-value variations of various shapes, and we characterize its resolution by identifying the smallest detectable b-value change for a given catalog size. The method also allows finding the ideal number of magnitudes per b-value estimate (or, equivalently, a length- or timescale), for which the pattern of b-values is maximized. For synthetic data, we found that this length scale could be related to the optimal number of magnitudes per estimate in terms of information gain when forecasting magnitudes of future earthquakes. Finally, we revisit the temporal and spatial b-value patterns in the Parkfield section of the San Andreas fault and evaluate their significance using our new approach. We find significant spatial variations along strike and with depth. However, the temporal variation is not significant, despite the visual appearance that change is occurring. We argue that before interpreting any b-value change, it should first b-significant.
Avaliação e aprimoramento do sistema de água quente em moradia universitária: Um exemplo de intervenção
Authors: Emanuel Rodrigues da Silva Rodrigo , Martins de Paula Heber , De Pádua Castro Metsavaht Yan 
Published: September 2024

A utilização de sistemas de aquecimento solar de água pode trazer economia, diminuindo impactos ambientais em comparação com fontes convencionais de energia. O objetivo principal do trabalho foi identificar patologias no sistema predial de água quente da Moradia Universitária do Cerrado (MUC) em Catalão-GO, e corrigi-las por meio de intervenções, avaliando a eficiência antes e após. Durante catorze meses, foram coletados dados do consumo de água fria, água quente, e energia dos apartamentos e do número de moradores do edifício. Na intervenção houve substituição da tubulação de CPVC por tubos de PEX, mudança nas interligações das placas, introdução de bomba hidráulica e válvulas para melhorar a recirculação, e a troca da resistência elétrica. Após as modificações, houve uma tendência de redução no consumo total de água quente e no índice de consumo (IC). O tempo médio de aquecimento dos chuveiros foi reduzido de 2 minutos para 20 segundos. Além disso, o consumo médio de água quente por morador diminuiu em 23,47%. O consumo de energia, que apresentava uma tendência de aumento, estabilizou-se após as modificações, indicando uma melhoria na eficiência energética do prédio. Assim, as intervenções contribuíram para aumentar a eficiência das instalações.
Improving environmental literacy through the development of problem-based learning models that incorporate local wisdom
Authors: Lubis Silvi Puspa Widya Lubis , Suryadarma Gusti Putu , Paidi  , Yanto Bagus Endri 
Published: September 2024

This study aimed to determine the validity of the problem-based learning with local wisdom in Acehnese oriented to socio-scientific issues to improve students' environmental literacy, and to find out the practicality of the problem-based learning with local wisdom oriented to socio-scientific issues model, to improve students' environmental literacy. This research used the design of developmental research stages according to Branch that consists of Define, Design, Develop, Disseminate (4D). Data collection was conducted by using instruments in the form of tests, questionnaire sheets, and product validation sheets. The data was analyzed by adopting qualitative data with content analysis techniques and quantitative data were analyzed with descriptive statistics. The results showed that problem-based learning with local wisdom oriented to a socio-scientific issues model was proven to have a level of validity and practicality to improve students' environmental literacy. This study concludes that the design of problem-based learning with local wisdom oriented to socio-scientific issues models and its supporting tools are feasible to use to improve students' environmental literacy skills with good categories.
Keywords: Environmental literacy; local wisdom; problem-based learning; socio-scientific issue