bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Two-Dimensional Multibeam Scanning Leakage Antenna Design Based on Amplitude Weighting
Authors: Hou Shunhu , Fang Shengliang , Dong Yaoyao , Tian Jinlong , Wang Yuxin , Xu Zhaojing , Li Jinxuan 
Published: June 2024

Abstract

This article designs a 20*20 beam-scanning leakage antenna square array operating at 32.1 GHz based on the amplitude weighting technique with the holographic antenna principle. We propose the microstrip line antenna cell with etched complementary split ring resonator (CSRR), use the liquid crystal(LC) material to realize the switching of the antenna cell state, and analyze the cell resonance characteristics. By arranging the units in a two-dimensional (2D) periodic manner and using amplitude weighting technology to control the state of each unit, beam scanning of the 2D antenna can be achieved. In the experimental process, we solve the problem of beam center depression due to the phase cancellation of front and back radiating waves, while a Python-HFSS (PH) control coding method is proposed to improve the coding efficiency during the design process. Simulation experiments show that the 2D antenna array can realize single-beam switching with its beam azimuth angle φ from − 36° to 40° and pitch angle θ from − 60° to 38°. After realizing the single-beam scanning, this paper establishes the theoretical system of multibeam scanning of 2D leakage antenna arrays based on amplitude weighting for the first time. After experimental verification, the antenna array can realize its dual/triple beam scanning with beam azimuth φ from − 30° to 30° and pitch angle θ from − 60° to 30°, which indicates that the theoretical system can be well applied to the design and application of 2D beam-scanning leakage antenna arrays.
AHP Celebrity Recommendation Based On Luscher Color Theory: Twitter Use Case
Authors: Tajbakhsh Mir Saman , Solouk Vahid 
Published: June 2024

Abstract

Social Networks are among the emerging services in the current virtual world which are used as a connecting medium between users over the Internet. Users generally connect to social networks to interact with their family members, coworkers, or even for commercial goals. Hence, the key for the success of every social network provider lies on satisfying user interest and thereby, expanding the network. Accordingly, one way to increase users' interest toward a social network is introducing them to other users with the similar characteristics using recommender systems. The current article introduces a recommender system based on AHP method and semantic similarities as well as color psychology between users in an online social network. To evaluate the proposed system, we used 5705 real Twitter celebrity profiles as alternative for recommendation, together with 100 virtual profiles as ordinary users. The experimental results indicate maximum recommendations error rate as low as 12.5.
1H, 13C, and 15N resonance assignments of a the amyloidogenic peptide SEM2(49-107) by NMR spectroscopy
Authors: Troshkina Anastasia , Klochkov Vladimir , Bikmullin Aydar , Klochkova Evelina , Blokhin Dmitriy 
Published: June 2024

Abstract

It has been shown that human seminal fluid is a major factor in enhancing HIV activity. The SEM2(49–107) peptide is a product of cleavage after ejaculation by internal prostheses of the semenogelin 2 protein, expressed in seminal vesicles. It is established that the peptide SEM2(49–107) forms amyloid fibrils, which increase probability of contracting HIV infection. In this nuclear magnetic resonance (NMR) study, we present almost complete (86%) resonance distributions for the 1H, 15N and 13C atoms of the backbone and side-chain of the SEM2peptide (49–107) (BioMagResBank accession number 52356). The secondary structure of SEM2(49–107) peptide was estimated by using two approaches, secondary chemical shifts analysis (CSI) and TALOS-N prediction. Analysis of the secondary structure of the SEM2(49–107) peptide using both methods revealed that the peptide contains helical segments at the C-terminal. Also in this work, we used phase-sensitive 2D HSQC 1H-15N experiments measuring longitudinal T1 and transverse T2 NMR relaxation times to report predicted secondary structure and backbone dynamics of the SEM2(49–107) peptide. This resonance assignment will form the basis of future NMR research, contributing to a better understanding of the peptide structure and internal dynamics of molecule.
Development, validation, and cut-off points for a questionnaire to measure Sources of Stress in Veterinary Medicine (SOS-Vetmed)
Authors: Osca A. , Millán L. , Vela L. , Barrado J. 
Published: June 2024

Abstract

Background
Occupational stress is a serious problem in veterinary medicine; however, validated instruments to measure this problem are lacking. The aim of the current study was to address this literature gap by designing and validating a questionnaire and establishing the cut-off points for identifying veterinarians with high and low levels of stress.
Methods
The study involved two sub-studies with two Spanish samples. The first study (N = 30 veterinarians; 66.7% women; 63.33% from small animal clinics) investigated the factors related to the work environment that caused the most stress; the results were analyzed using thematic content analysis. The second study (N = 1082; 70.8% women; 71.4% from small animal clinics) involved designing and validating a questionnaire to measure sources of stress in veterinary medicine, as well as establishing the cut-off points for interpreting the results using receiver operating characteristics (ROC) curve analysis.
Results
The first study showed the main sources of stress and allowed items to be defined for the questionnaire. The second study validated the Sources of Stress in Veterinarian Medicine (SOS-VetMed) questionnaire and confirmed five sources of stress with adequate reliability and validity indices: “work overload,” “work–family conflict,” “emotional burden of work,” “organizational factors,” and “emergency problems.” The confirmatory factor analysis verified their structure with χ2(265) = 1967.23, χ 2/degree of freedom = 7.42, comparative fit index = 0.89, and standardized root mean square residual = 0.073. The five subscales of the SOS-VetMed questionnaire were positively correlated with two indicators of distress: “psychological complaints” and “psychosomatic complaints.” The cut-off points indicated that 45.83% and 19.95% of the veterinarians surveyed had high and low levels of stress, respectively.
Conclusions
The results confirmed that the SOS-VetMed questionnaire could be used to determine the stress levels of veterinarians and to design intervention programs to improve their workplace health.
Contamination and Sources of Surface Water in Korba Coal Basin, Chhattisgarh, India
Authors: Patel Khageshwar Singh , Pandey Piyush Kumar , Sahu Bharat Lal , Ramteke Shobhana , Wysocka Irena , Yurdakul Sema , Jhariya Dalchand , Martín-Ramos Pablo , Rahman Mohammad Mahmudur 
Published: June 2024

Abstract

In India, surface water reservoirs are widely harnessed to meet a variety of needs, including domestic, agricultural, and industrial applications. The quality of these resources, particularly in coal mine regions, undergoes substantial deterioration due to the discharge of various wastes (industrial, municipal, and runoff water) and coal ash deposition. The Korba basin, shaped by mining activities, shallow groundwater levels, and the flow of the expansive Hasedo River, features numerous ponds, pit lakes, and canals. A significant health concern in this area is the prevalence of fluorosis disease among the local population. The main aim of this study was to evaluate the water quality of reservoirs, including ponds, pit lakes, canals, and rivers, with a focus on identifying contaminant levels and tracing the sources of chemical species such as carbonate and organic carbons, anions, and metals. During the period from 2012 to 2017, elevated carbon contents (varying from 1010 to 4420 mg·L− 1) markedly contributed to increased total dissolved solids (TDS), with values ranging between 2865 and 5540 mg·L− 1. fluoride (F−), aluminum (Al), iron (Fe), and manganese (Mn) concentrations in all surface water bodies exhibited variations within the ranges of 1.8–4.4, 0.42–1.91, 0.3–1.22, and 1.0–2.1 mg·L− 1, respectively. This study delves into the temporal and seasonal variations, water quality indices, and toxicities associated with the identified contaminants.
Quantifying Water Footprint: A Study on the Academic and Administrative Personel at Konya Technical University
Authors: Mesutoğlu Özgül Çimen 
Published: June 2024

Abstract

This study endeavours to quantify the water footprint of academic and administrative personnel at Konya Technical University. Water footprint assessment, a critical metric for evaluating human impact on water resources, is increasingly recognized as a vital aspect of sustainable resource management. The research involves surveying participants on their water consumption habits, particularly focusing on preferences related to food and sugar intake. Preliminary findings indicate diverse responses in terms of food preference, with a majority favouring low intake. Likewise, the survey reveals varying patterns in sugar and sweets consumption, shedding light on the frequency and extent of such practices. By systematically analysing the water footprint within the university community, this study contributes to a broader understanding of water resource utilization and offers insights for sustainable practices in academic and administrative settings. The study aimed to determine the water footprint of the campus in relation to personal consumption behaviours by asking the questions in the "Water Footprint Network (WFN)" to a total of 476 people at the campus, including both the academic and administrative staff. According to the WFN, the average water footprint of the staff was determined as 1694 m3/year.
Analysis of the Seismic Impact of the Atrium Steel Suspension Bridge System on a Museum
Authors: Zheng Zhitao , Shen Wenbing , Li Sheng , Li Chuang 
Published: June 2024

Abstract

The structure of a large museum is novel, with a zigzag-shaped steel suspension bridge system in the atrium. To study the impact of this system on the overall seismic performance of the museum, ABAQUS software was used to create two 3D models: Model I without the system and Model II with the system. An in-depth analysis was conducted on the time-history response laws of maximum roof displacement, inter-story drift angle, and roof acceleration under frequently and rarely occurring earthquake conditions, providing a comprehensive study of the seismic performance. The study found that the maximum roof displacement and acceleration increased with the floor height in both models. Model II showed an average reduction of over 44.85% in roof displacement response and 35.77% in acceleration response compared to Model I. The inter-story drift angle in both models initially increased and then decreased with floor height, reaching a maximum on the second floor. Model II exhibited an average reduction of over 33.07% in inter-story drift angle compared to Model I. The inter-story shear force decreased with floor height, with an average reduction of over 40.03% in Model II compared to Model I. The results indicate that the suspension bridge system constrains the displacement of the museum's outer frame structure, thereby reducing the overall structural displacement, inter-story drift angle, and significantly enhancing the overall structural stiffness and seismic performance.
Adaptive Hip Exoskeleton Control using Heart Rate Feedback Reduces Oxygen Cost during Ecological Locomotion
Authors: Manzoori Ali Reza , Malatesta Davide , Mortier Alexandre , Garcia Johan , Ijspeert Auke , Bouri Mohamed 
Published: June 2024

Abstract

Despite their potential, exoskeletons have not reached widespread adoption in daily life, partly due to the challenge of seamlessly adapting assistance across various tasks and environments. Task-specific designs, reliance on complex sensing and extensive data-driven training often limit the practicality of the existing control strategies. To address this challenge, we introduce an adaptive control strategy for hip exoskeletons, emphasizing minimal sensing and rapid deployability. Using only insole pressure and heart rate (HR) sensing, the controller modulates assistance across various locomotion tasks. We evaluated this strategy with twelve able-bodied participants in a real-world scenario including level walking, stairs, and inclines. The controller successfully adapted assistance timing and amplitude to different activities. This resulted in effort intensity reductions (measured by oxygen uptake) of up to 12.6\% compared to normal walking, and up to 25.5\% compared to walking with the passive exoskeleton. Cardiodynamic response of HR, although delayed, proved sufficient for adaptation in most tasks, and delay-induced limitations primarily affected brief bouts of abrupt change in intensity. However, we found discernible patterns in HR shortly after the onset of such changes that can be exploited to improve responsiveness. Our findings underscore the potential of HR as a promising measure of user effort intensity, encouraging future research to explore its integration into advanced adaptive algorithms.
Variational Quantum Kolmogorov-Arnold Network
Authors: Wakaura Hikaru , Suksmono Andriyan B. 
Published: June 2024

Abstract

We implemented a quantum version of the Kolmogorov-Arnold Network (KAN) on a quantum circuit. It optimizes the weight of each synaptic connection to enhance the overall performance of the neurons. This approach offers a significant boost in efficiency over traditional neural networks, as it can be optimized more accurately and requires only a few neurons to solve complex problems. The KAN is a multi-layer network, similar to a traditional neural network, with each layer represented as a matrix containing parameters and feedback. This structure is linear and mirrors the form of Variational Quantum Algorithms. Thus, we propose the Variational Quantum Kolmogorov-Arnold Network (VQKAN) as a quantum version of the Kolmogorov-Arnold Network. We demonstrated the optimization of VQKAN for the fitting of the given function in various ways, such as by using ansatzes and comparisons.
Photocatalytic and Adsorption Performance of Averrhoa carambola Leaf mediated AC@ZnO Nanomaterial: A green approach
Authors: B Jebanisha , Devi V N Meena , Ani M 
Published: June 2024

Abstract

Averrhoa carambola L. leaf extract was used in this study to synthesis zinc oxide nanoparticles and activated carbon loaded zinc oxide. The prepared nanomaterial was used as a photocatalytic degradation and biosorbent to remove the cationic dye, Methylene Blue (MB) from aqueous solutions. UV-visible spectroscopy, X-ray diffraction, and FTIR were used to confirm the formation of zinc oxide nanoparticles and AC@ZnO. The experimental procedure involved a batch adsorption process, wherein several key parameters such as contact time, biosorbent dosage, dye concentration, and pH were systematically varied to investigate their impact on both photocatalytic and adsorption capacities. The MB may bond more successfully in an alkaline pH environment. When tested the Boyd, intra particle diffusion, and pseudo-second order kinetic models accurately represented the adsorption kinetics. The equilibrium data were modelled with the Harkins-Jura, Freundlich, D-R, and Langmuir isotherms. In comparison to ZnO NPs, the AC@ZnO sample has higher photocatalytic activity, as evidenced by the photocatalytic degradation of MB dye and the results. AC@ZnO out performed ZnO in terms of both adsorption and photocatalytic degradation. These findings show the cooperative action of ZnO (photocatalysts) and AC (adsorption) in the synthesis of the AC@ZnO sample. The results provide conclusive proof that AC@ZnONps is an effective material for removing MB dye from waste water.
THE SCOTTISH TRACE IN THE HISTORY OF DANISH-RUSSIAN DIPLOMACY OF THE END OF THE 15 – FIRST QUARTER OF THE 16 CENTURIES
Authors: Ласкова Н.В. 
Published: June 2024

На фоне развития датско-русских дипломатических контактов конца XV – первой четверти XVI вв. анализируется участие в переговорах на высшем уровне датского посла Дэвида Кокрана. Поскольку в документальных источниках и исторических исследованиях его посольства в Россию представлены, как правило, в свете развития русско-датских отношений, акцентируется внимание на биографии «герлада Давида» и факту признания его шотландского происхождения. На основе русского, датского и шотландского документального материала, сделан вывод о том, что в 90-е годы XV века и в первой четверти XVI столетия послом «о любви и дружбе» от датских монархов Иоганна и Кристиана II в Московии являлся шотландец по происхождению, называемый в русских летописях Давыд или Давид. Датский герольд-шотландец имел непосредственное отношение к процессу развития внешнеполитических связей Дании и России в конце XV- нач. XVIвв., являясь связующим звеном между Копенгагеном и Москвой. С одной стороны, данное обстоятельство позволило дополнить сведения о британцах, посещавших Московию до официального установления англо-русских дипломатических контактов в XVI в., с другой – проследить основания, способствовавшие факту признания в историографии данного лица в качестве первого шотландца, побывавшего в России.
Against the background of the development of Danish-Russian diplomatic contacts at the end of the XV – first quarter of the XVI centuries, the participation of Danish Ambassador David Cochran in high-level negotiations is analyzed. Since documentary sources and historical studies of his embassies to Russia are presented, as a rule, in the light of the development of Russian-Danish relations, attention is focused on the biography of "Gerlad David" and the fact of recognition of his Scottish origin. Russian, Danish and Scottish documentary material led to the conclusion that in the 90s of the XV Сentury and in the first quarter of the XVI Сentury, the ambassador of “love and friendship” from the Danish monarchs Johann and Christian II in Muscovy was a Scot by origin, called David in Russian chronicles. The Danish herald-Scotsman was directly involved in the development of foreign policy relations between Denmark and Russia at the end of the XV-beginning XVI century, being a link between Copenhagen and Moscow. On the one hand, this circumstance allowed us to supplement information about the British who visited Muscovy before the official establishment of Anglo-Russian diplomatic contacts in the XVI century, on the other hand, to trace the grounds that contributed to the fact of recognition in historiography of this person as the first Scot to visit Russia.
Optimizing pipeline systems with surge tanks using a dimensionless transient model
Authors: Kim Sanghyun 
Published: June 2024

ABSTRACT
The design factor of surge tank installation is a practical issue in the management of pressurized pipeline systems. To determine the general criteria for surge tank design in pipeline systems, dimensionless governing equations for unsteady flow and their solutions were developed for two widely used pipeline systems equipped with surge tanks. One is the reservoir pipeline surge tank valve and the other is the pipeline system with a pumping station and check valve protected by the surge tank. Two distinct time-domain responses, point- and line-integrated pressure, can be used as objective functions to optimize the surge tank area. The developed formulations were integrated into a metaheuristic engine, particle swarm optimization, to explore a general solution for a wide range of dimensionless resistances that comprehensively address various flow features into one dimensionless parameter. Depending on the dimensionless location of the surge tank, the optimum dimensionless surge tank areas were delineated for a range of dimensionless resistances for the two pipeline systems with and without a pumping station protected by a surge tank.
Perceived public service performance, trust in the government, and citizens' willingness to participate: Evidence from water governance in Visakhapatnam, India
Authors: Ati Srilekha , Satpathy Suchismita , Saxena Srishti 
Published: June 2024

ABSTRACT

The present paper analyzes the relationship between perceived public service performance, trust in the government, and citizens' willingness to participate in water governance with insights into broader state–citizen relations. The study is based on a household survey conducted in June 2022 that employed a multistage stratified random sampling within the Greater Visakhapatnam Municipal Corporation limits of Andhra Pradesh, a southern state of India. The analysis reveals that citizens' perception of water service delivery performance positively affects trust in water managers while negatively affecting their willingness to participate in water governance. In contrast, the citizens' trust in water managers positively correlates to their willingness to participate. Moreover, the identified correlations among the three variables elucidate a circular pattern. The intricate circular pattern observed among these three variables complicates the citizen–state relationship. Understanding and navigating this complex web of relationships is crucial for policymakers and researchers seeking to enhance citizen participation and trust in water services. The circular nature of these interactions underscores the need for holistic and integrated approaches in addressing the multifaceted dynamics within the citizen–state relationship.
Compounds from Natural Products Candidates to Drug for Chikungunya
Virus Infection: A Systematic Review
Authors: de Mattos Oliveira Larissa , Araújo Janay Stefany Carneiro , de Andrade Kaio Vinicius Freitas , Guerrero Moureau Ana Tereza Gomes , dos Santos Junior Manoelito Coelho 
Published: June 2024

Introduction:
Chikungunya fever is a disease caused by infection with the Chikungunya
virus, transmitted by Aedes aegypti and Aedes albopictus mosquitoes. Despite its self-limited
character, more than 60% of patients have chronic recurrent arthralgia with debilitating pain that
lasts for years.

Aim:
The objective of this review was to gather and analyze evidence from the literature on potential
therapeutic strategies with molecules from natural products for the treatment of Chikungunya
fever.

Methods:
A search was performed for clinical trials, observational studies, in vitro or in vivo, without
restriction of the year of publication or language in electronic databases (Medline/PubMed,
EMBASE, Google Scholar, The Cochrane Library, LILACS (BVS), clinical trial registries (Clinical
Trials.gov), digital libraries from CAPES theses and dissertations (Coordenação de Aperfeiçoamento
de Pessoal de Nível Superior, Brazil) and conference abstracts. A quality assessment of the
selected studies was performed using the SYRCLE, RoB2 and SciRAP tools.

Results:
42 studies were included, which showed molecules with potential antiviral pharmacological
activity or with activity in reducing the joint complications caused by CHIKV infection.

Conclusions:
Among the molecules found in the survey of references, regarding the class of secondary
metabolites, flavonoids stood out and for this reason, the molecules may be promising
candidates for future clinical trials. Overall, evidence from in vitro studies was of acceptable quality;
in vivo and intervention studies showed a high risk of bias, which is a limitation of these
studies.