bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and development of high precision four roll CNC roll bending machine and automatic control model
Authors: Jing Yigang , Jiang Shangsheng , Sun Qun , Zhao Ying , Song Zhihao , Meng Xiangyan , Li Hengzhen 
Published: August 2023

AbstractIn recent years, advancements in industries such as aerospace, military weaponry, automobiles, locomotives, and shipbuilding have led to a surge in the demand for bent and rolled components, along with increasingly stringent requirements for rolling precision. However, the traditional hydraulic cylinder feeding solution has hindered further enhancements in the accuracy of rolled profile contours. Additionally, owing to variations in profile specifications, material properties, and an assortment of random factors during the forming process, the applicability of existing forming formulas remains limited, rendering them suitable only for profile processing under specific circumstances. To address these challenges, servo electric cylinders have been introduced as a replacement for traditional hydraulic cylinders, and the mechanical structure of a four-roll bending machine has been re-engineered. This innovation has demonstrated the feasibility of employing servo electric cylinders in four-roll CNC bending machines for profile bending, resulting in higher control precision and faster response times, ultimately providing a comprehensive design solution for four-roll CNC bending machines. In response to the limited universality of existing forming formulas, the actual R (profile forming curvature) and d (servo electric cylinder feed) values from the four-roll CNC bending machine have been utilized, and curve fitting methods have been implemented as the foundation for the automatic control model. This approach offers a high degree of universality, making it suitable for a wide range of applications. Moreover, as the number of trials increased, forming precision progressively improved.
Finite element analysis and structure optimization of a gantry-type high-precision machine tool
Authors: Chan Tzu-Chi , Ullah Aman , Roy Bedanta , Chang Shinn-Liang 
Published: August 2023

AbstractThe high-precision machine tool’s dynamic, static, and rigid nature directly affects the machining efficiency and surface quality. Static and dynamic analyses are essential for the design and improvement of precision machine to ensure good tool performance under difficult and demanding machining conditions. In this study, the performance of a high-precision machine tool was analyzed using its virtual model created using CAD. Static and model analysis using ANSYS Workbench software was conducted to establish the tool's static deformation and static stiffness. Furthermore, the static and dynamic characteristics of the tool were explored using a finite element modeling approach to study their performance. In particular, the structure, static force, modal, frequency spectrum, and topology optimization of machine tools were primarily analyzed. Using model analysis, we found the first four different frequencies (22.5, 28.9, 40.6, and 47.4 Hz) and vibration type, which suggested of a weak link. Further static structural analysis revealed that the deformation of the spindle was 67.26 μm. An experimental static rigidity analysis was performed, and the experimental deformation values of the tool and spindle were obtained. The static and dynamic characteristics, as well as the accuracy and efficiency of the finite element model, were verified by comparing the data with the finite element analysis (FEA) results. Subsequently, we modified the settings and analysis model to ensure that the analysis results were consistent with the experimental findings. The error between the two results was within 1.56%. For an applied load of 5000 N on the spindle nose, the tool nose transient response was 0.5 s based on transient analysis. Under the condition that the structural deformation is as constant as possible, the lightweight structure may achieve the minimum weight and enhance the natural frequency; thus, the ideal structure will be obtained, and finite element analysis will then be performed. The optimal conditions for topology optimization include a lightweight structure, reduced structural deformation, and increased natural frequency of the structure. The developed method improves structural optimization, increases the ability of the product to be manufactured, and offers designers a variety of price-effective options.
Machine learning and metagenomics reveal shared antimicrobial resistance profiles across multiple chicken farms and abattoirs in China
Authors: Baker Michelle , Zhang Xibin , Maciel-Guerra Alexandre , Dong Yinping , Wang Wei , Hu Yujie , Renney David , Hu Yue , Liu Longhai , Li Hui , Tong Zhiqin , Zhang Meimei , Geng Yingzhi , Zhao Li , Hao Zhihui , Senin Nicola , Chen Junshi , Peng Zixin , Li Fengqin , Dottorini Tania 
Published: August 2023

AbstractChina is the largest global consumer of antimicrobials and improving surveillance methods could help to reduce antimicrobial resistance (AMR) spread. Here we report the surveillance of ten large-scale chicken farms and four connected abattoirs in three Chinese provinces over 2.5 years. Using a data mining approach based on machine learning, we analysed 461 microbiomes from birds, carcasses and environments, identifying 145 potentially mobile antibiotic resistance genes (ARGs) shared between chickens and environments across all farms. A core set of 233 ARGs and 186 microbial species extracted from the chicken gut microbiome correlated with the AMR profiles ofEscherichia colicolonizing the same gut, includingArcobacter, AcinetobacterandSphingobacterium, clinically relevant for humans, and 38 clinically relevant ARGs. Temperature and humidity in the barns were also correlated with ARG presence. We reveal an intricate network of correlations between environments, microbial communities and AMR, suggesting multiple routes to improving AMR surveillance in livestock production.
A study of bandgap-graded CZTGSe kesterite thin films for solar cell applications
Authors: Scaffidi Romain , Brammertz Guy , Wang Yibing , Zaman Arman Uz , Sasikumar Keerthi , de Wild Jessica , Flandre Denis , Vermang Bart 
Published: August 2023

The sustainable and harmless Cu2ZnSn(S,Se)4 kesterite materials for thin-film photovoltaics are still lacking efficiency, which may be solved by bandgap grading, herein obtained by two-step annealing in H2Se gas of metallic precursors.
SwarmAd: A decentralised content management system
Authors: Baldo Tommaso , Migliardi Mauro 
Published: August 2023

AbstractOnline presence is becoming an important part of everyday's life and online communities may represent a significant source of engagement for the elderlies. Nevertheless, many may struggle to be online due to a lack of expertise, and a decentralised architecture may provide a solution by removing intermediaries, such as a webmaster, while not requiring expensive cloud solutions. However, issues concerning accessibility, security, and user experience have to be tackled. The paper focuses mainly on three issues: providing a human‐readable domain, moderating content, and creating a reward system based on user reputation. An architecture is proposed based on Ethereum and Swarm. Smart contracts provide an automated set of rules to handle enterprise registration, content creation, and decision‐making process, while Swarm serves both as distributed storage and the web host. Besides, in combination with Ethereum Name Service, Swarm provides a secure, distributed, and human‐readable point of access to the web interface. The paper also describes an innovative two‐token system where one token is meant to be a trustworthy reputation metre and the other is a spendable coin to get rewards. The final result is a fully decentralised, authenticated and moderated platform where users can aggregate and share their content presentations on the Internet.
A novel protection scheme for doubly fed induction generator‐based wind turbines during the fault occurrence in the rotor‐circuit
Authors: Rostami Ali , Rezaei Navid 
Published: August 2023

AbstractThe rotor‐circuit (RC) of the doubly fed induction generator‐based wind turbine (DFIG‐WT) consists of various equipment in which faulty conditions must be immediately identified, because this faulty status leads to the loss‐of‐excitation (LOE) phenomenon and may cause some serious damages. In this regard, this paper develops a novel solution to protect the DFIG‐WT during such a condition. For this purpose, a comprehensive investigation on behavior of the DFIG‐WT during the conditions of the RC failures has been carried out. The results show that, the output active power of the machine (Pdfig) can be considered as a suitable initial indicator for detecting the RC failures. However, to reliable detection of the partial‐LOE (PLOE), complete‐LOE (CLOE) and discrimination from the other power system disturbance (PSD), a directional over‐current (DOC) and an under voltage (UV) relays are suggested to be installed in the RC, at both ends of the back‐to‐back converters. Consequently, by detecting the Pdfig decrement, the provided DOC and UV relays in the RC will be triggered to classify the occurred events. The outlined protection scheme is exhaustively investigated on a typical power system which the obtained simulation results show the high reliability in discriminating the RC failures and PSD events with an acceptable detection time.
A GPU‐based real‐time processing system for frequency division multiple‐input‐multiple‐output radar
Authors: Liu Gaogao , Bao Yuqian , Yue Ning , Wang Sitian , Wu Hui , Liu Qiang , Yang Wenbo 
Published: August 2023

AbstractMultiple‐Input‐Multiple‐Output (MIMO) radar has the characteristic of multiple antenna channels, bringing on a big data volume for signal processing. Therefore, the trade‐off between detection ability and computational efficiency is always considered. In this article, an optimisation system is proposed to enhance the real‐time performance of frequency division MIMO radar without compromising accuracy. For the scenario of low‐altitude small target detection, a signal processing acceleration method is proposed and a MIMO radar optimisation system based on graphics processing unit (GPU) architecture is built. The signal model of frequency division MIMO radar is first established, improving the classical signal processing flow efficiency from the perspective of reducing fast Fourier transform (FFT) times and windowing operation times. To achieve an advanced acceleration, the parallel architecture of ArrayFire‐library in GPU is then employed. Distinct minimum parallel units are extracted by analysing the principle of digital beamforming (DBF), pulse compression, moving target detection (MTD), and constant false‐alarm rate (CFAR) algorithms. And the corresponding parallel algorithms are designed to constitute a parallel acceleration system of frequency division MIMO. Simulation results indicate that the proposed method significantly improves the efficiency of MIMO system with a maximum acceleration ratio of 65 times, meeting the real‐time processing requirements.
A shared channel access protocol with energy saving in hybrid Radio‐Frequency Identification networks and wireless sensor networks for use in the internet of things platform
Authors: Rezaie Hadiseh , Golsorkhtabaramiri Mehdi 
Published: August 2023

AbstractRadio‐Frequency Identification and Wireless Sensor Networks (WSN) are two basic pillars in the Internet of Things (IOT); they are used to identify and track objects, and collect information from the environment in various applications of the IOT. One of the architectures used for combining these two technologies is the combination of readers with wireless sensor nodes. In the combination of Radio‐Frequency Identification and WSN, we face issues concerning reader collision, tag rereading and load imbalance. In the dense environments of this hybrid network, due to congestion and the possible mobility of nodes, controlling access to the shared channel is one of the basic challenges. In addition, owing to the energy limitations of these networks, data redundancy and tag re‐reading are critical issues. An effective anti‐collision protocol suitable for RFID‐WSN networks is proposed to avoid the above‐mentioned issues. The Energy‐saving and Anti‐collision Protocol (EAP) method is a CSMA‐based multi‐channel protocol that not only solves the issue of readback collisions, but also, through tagging, it prevents the rereading of the tags. To evaluate the performance of the EAP method, this protocol is compared with the most prominent reader anti‐collision protocols ever presented. The results indicate that due to the better throughput and higher energy efficiency that the proposed protocol has, when compared to other multi‐channel protocols, it will be a better option for use in the IOT platform with dense conditions.
Long-period radial velocity variations of nine M red giants
Authors: Lee Byeong-Cheol , Do Hee-Jin , Park Myeong-Gu , Lim Beomdu , Choi Yeon-Ho , Koo Jae-Rim , Bang Tae-Yang , Oh Hyeong-Ill , Han Inwoo , Chang Heon-Young 
Published: August 2023

Context. Certain periodic variations of radial velocities (RVs) of wobbling giants originate from exoplanets. A number of exoplanets have been discovered around giant stars.
Aims. The purpose of our study is to find low-amplitude and long-period RV variations around bright M (super) giants in the red giant branch (or asymptotic giant branch) stage, which are long-period variables (LPVs) or high proper motion stars.
Methods. The high-resolution fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at the Bohyunsan Optical Astronomy Observatory (BOAO) was used to record numerous spectra of nine giants. The observation period for the targets spanned 16 yr, from 2005 to 2022.
Results. We found two substellar companions from the precise RV observations of nine M giants. One companion has a 28.26−2.17+2.05 MJ orbiting period of 663.87−4.31+4.61 days at a distance of 2.03−0.01+0.01 AU (HD 6860), and the other has a 15.83−2.74+2.33 MJ orbiting period of 466.63−1.28+1.47 days at a distance of 1.33−0.11+0.08 AU (HD 112300). Our estimate of the stellar parameters for HD 6860 makes it the currently largest star with a substellar companion. We also found RV variations mimicking a planetary companion in HD 18884 and confirmed LPVs in two stars, HD 39801 and HD 42995. The RV variations of some stars seem to be associated with stellar activities rather than reflex orbital motion due to their companions. Variations like this are also detected for HD 6860 and HD 112300, which host substellar companions.
The impact of H II regions on giant molecular cloud properties in nearby galaxies sampled by PHANGS ALMA and MUSE
Authors: Zakardjian Antoine , Pety Jérôme , Herrera Cinthya N. , Hughes Annie , Oakes Elias , Kreckel Kathryn , Faesi Chris , Glover Simon C. O. , Groves Brent , Klessen Ralf S. , Meidt Sharon , Barnes Ashley , Belfiore Francesco , Bešlić Ivana , Bigiel Frank , Blanc Guillermo A. , Chevance Mélanie , Dale Daniel A. , den Brok Jakob , Eibensteiner Cosima , Emsellem Eric , García-Rodríguez Axel , Grasha Kathryn , Koch Eric W. , Leroy Adam K. , Liu Daizhong , Mc Elroy Rebecca , Neumann Lukas , Pan Hsi-An , Querejeta Miguel , Razza Alessandro , Rosolowsky Erik , Saito Toshiki , Santoro Francesco , Schinnerer Eva , Sun Jiayi , Usero Antonio , Watkins Elizabeth J. , Williams Thomas 
Published: August 2023

Context. The final stages of molecular cloud evolution involve cloud disruption due to feedback by massive stars, with recent literature suggesting the importance of early (i.e., pre-supernova) feedback mechanisms.
Aims. We aim to determine whether feedback from massive stars in H II regions has a measurable impact on the physical properties of molecular clouds at a characteristic scale of ~ 100 pc, and whether the imprint of feedback on the molecular gas depends on the local galactic environment.
Methods. We identified giant molecular clouds (GMCs) associated with H II regions for a sample of 19 nearby galaxies from catalogs of GMCs and H II regions released by the PHANGS-ALMA and PHANGS-MUSE surveys, using the overlap of the CO and Hα emission as the key criterion for physical association. We compared the distributions of GMC and H II region properties for paired and non-paired objects. We investigated correlations between GMC and H II region properties among galaxies and across different galactic environments to determine whether GMCs that are associated with H II regions have significantly distinct physical properties compared to the parent GMC population.
Results. We identify trends between the Hα luminosity of an H II region and the CO peak brightness and molecular mass of GMCs that we tentatively attribute to a direct physical connection between the matched objects, and which arise independently of the underlying environmental variations of GMC and H II region properties within galaxies. The study of the full sample nevertheless hides a large galaxy-to-galaxy variability.
Conclusions. At the ~100 pc scales accessed by the PHANGS-ALMA and PHANGS-MUSE data, pre-supernova feedback mechanisms in H II regions have a subtle but measurable impact on the properties of the surrounding molecular gas, as inferred from CO observations.
The MUSE-Faint survey
Authors: Júlio Mariana P. , Brinchmann Jarle , Zoutendijk Sebastiaan L. , Read Justin I. , Vaz Daniel , Kamann Sebastian , Krajnović Davor , Boogaard Leindert A. , Steinmetz Matthias , Bouché Nicolas 
Published: August 2023

Aims. We use the stellar line-of-sight velocities of Antlia B (Ant B), a faint dwarf galaxy in the NGC 3109 association, to derive constraints on the fundamental properties of scalar field dark matter (SFDM), which was originally proposed to solve the small-scale problems faced by cold dark matter models.
Methods. We used the first spectroscopic observations of Ant B, a distant (d ∼ 1.35 Mpc) faint dwarf (MV = −9.7, M⋆ ∼ 8 × 105 M⊙), from MUSE-Faint, a survey of ultra-faint dwarfs conducted using the Multi Unit Spectroscopic Explorer. By measuring the line-of-sight velocities of stars in the 1′×1′ field of view, we identified 127 stars as members of Ant B, which enabled us to model its dark matter density profile with the Jeans modelling code GRAVSPHERE. We implemented a model for SFDM into GRAVSPHERE and used this to place constraints on the self-coupling strength of this model.
Results. We find a virial mass of M200 ≈ 1.66−0.92+2.51 × 109 M⊙ and a concentration parameter of c200 ≈ 17.38−4.20+6.06 for Ant B. These results are consistent with the mass-concentration relations in the literature. We constrain the characteristic length scale of the repulsive self-interaction RTF of the SFDM model to RTF ≲ 180 pc (68% confidence level), which translates to a self-coupling strength of g/m2c4 ≲ 5.2 × 10−20 eV−1 cm3. The constraint on the characteristic length scale of the repulsive self-interaction is inconsistent with the value required to match observations of the cores of dwarf galaxies in the Local Group, suggesting that the cored density profiles of those galaxies are not caused by SFDM.
Ambulante und stationsersetzende Eingriffe in der Gefäßchirurgie – was ist machbar und wo liegen die Grenzen? Bisherige und neue gesetzliche Vorgaben sowie deren Umsetzung in der Praxis
Authors: Meyer Frank , Halloul Zuhir , Barth Udo , Lehmann Martin , Tautenhahn Jörg 
Published: August 2023

Zusammenfassung
Einleitung: Auch in der Gefäßchirurgie werden in Zukunft mehr Leistungen und Prozeduren aus dem bisherigen stationären in den ambulanten Bereich verlagert werden müssen. Es sollen daher die bisherigen und neuen gesetzlichen Vorgaben sowie deren Umsetzung in der Gefäßchirurgie erläutert und beurteilt werden.
Material und Methoden: Berufspolitische Analyse aus ärztlicher gefäßchirurgischer Sicht.
Ergebnisse: Der AOP-Katalog ab 01.01.2023 wurde um 208 zusätzliche OPS-Kodes erweitert. Die stationäre Durchführung von Leistungen, die nach dem AOP-Vertrag regelhaft ambulant durchgeführt werden müssen, sollen nun anhand von Kontextfaktoren begründet werden. Eine spezielle sektorengleiche Vergütung, die unabhängig davon erfolgt, ob die vergütete Leistung ambulant oder stationär erbracht wird, ist eine Voraussetzung für eine kostendeckende Ausweitung ambulanter Operationen und stationsersetzender Leistungen. Die Sanierung der primären Varicosis unter ambulanten Bedingungen ist zweifelsfrei der Standard. Der überwiegende Teil der AV-Shuntanlagen erfolgt stationär. Es wurden keine neuen OPS-Kodes in den AOP-Katalog 2023 für die Varizen-, Shunt- sowie endovaskuläre Chirurgie eingefügt.
Diskussion: Die Verlagerung stationärer Leistungen in den ambulanten Sektor kann in Anlehnung an die Erfahrungen anderer europäischer Länder ein gangbarer Weg sein. Jedoch sollten zunächst die Strukturen, ökonomischen Voraussetzungen und Anreize geschaffen werden, um die Ambulantisierung erfolgreich voranzutreiben. Die integrierte Versorgung bietet die Möglichkeit, dass die Krankenkassen Verträge mit den in § 140a des Sozialgesetzbuches Absatz 3 genannten Leistungserbringern über eine besondere Versorgung abschließen können. Der Einsatz der Telemedizin im Sinne der Tele-Prämedikation oder des Tele-Monitorings kann gerade in ländlichen Regionen eine Möglichkeit sein, ambulante Operationen auszuweiten. Um Therapiekonzepte aus einer gefäßmedizinisch versierten Hand zu ermöglichen, ist die ambulante Leistungsabrechnung interventioneller Prozeduren auch durch vaskuläre Chirurgen und Spezialisten zu fordern.
Schlussfolgerung: Das Potenzial, stationäre Leistungen ins ambulante Setting der Leistungserbringung umzuwandeln, ist in der Gefäßchirurgie in den Kernbereichen Varizenchirurgie, Shuntchirurgie und periphere interventionelle Prozeduren unter spezifischen Voraussetzungen umsetzbar.
Studienevidenz zu Vitamin-C-Infusionen in der Onkologie
Authors: Vollbracht Claudia 
Published: August 2023

ZusammenfassungEin Vitamin-C-Mangel ist bei onkologischen Patientinnen und Patienten häufig und korreliert mit einer verminderten Lebensqualität und einer schlechteren Überlebensrate. Die Infusionsbehandlung kann Mangelzustände schnell beheben. Studien zeigen eine deutliche Verbesserung der Lebensqualität – insbesondere eine signifikante Linderung von Fatigue, Schmerzen, Appetitmangel, Schlafstörungen und Depressionen. Darüber hinaus kommt es unter Vitamin-C-Therapie zu einer geringeren Myelosuppression und einer klinisch relevanten Erhöhung der Lymphozytenzahl bei Lymphopenie. Erste klinische Studiendaten zeigen auch eine verlängerte Überlebenszeit. Letzteres wird durch experimentelle Studien unterstützt, die eine direkte selektive tumorzytotoxische Wirkung über die Bildung von Wasserstoffperoxid, eine Verschiebung des epigenetischen Profils in Richtung Tumorsuppression und eine Abnahme metastasierungsrelevanter Prozesse beobachten.
Asthma bronchiale: „Druck lass nach!“
Authors: Corts Magga 
Published: August 2023

SummaryAsthma bronchiale führt als entzündlich-obstruktive Atemwegserkrankung zu intermittierenden Bronchialspasmen mit anfallsweiser Dyspnoe und exspiratorischem Stridor, in vielen Fällen auch zur Lungenüberblähung. Durch eine Harmonisierung und Druckentlastung mittels osteopathischer Techniken soll der Thorax wieder befähigt werden, ein Höchstmaß an Stabilität, Mobilität und physiologischer Atmung herzustellen. Zu den bewährten osteopathischen Methoden zählen unter anderem Muskel-Energie-Techniken, Tenderpointbehandlung, myofasziale Techniken, Recoiltechnik, CV4, Sakrumrelease sowie ergänzend Ernährungs- und Stoffwechselregulationstherapien
Die Darm-Lungen-Achse
Authors: Rüffer Andreas 
Published: August 2023

SummaryLunge und Darm sind phylogenetisch sowie über das Schleimhautimmunnetzwerk miteinander verbunden. Daher wird auch von der Darm-Lungen-Achse gesprochen. In der Verbindung von Lunge und Darm spielt offensichtlich die Darmmikrobiota eine wichtige Rolle, insbesondere beim Asthma und bei Infekten der Atemwege. Bei der Behandlung von Asthma und Atemwegsinfekten ist unterstützend die Berücksichtigung der Darmmikrobiota diagnostisch und therapeutisch hilfreich.