bluuebunny/crossref_metadata_2025_split huggingface dataset:
Power system stability improvement considering drive train oscillations of virtual synchronous generator‐regulated type‐4 wind turbines
Authors: Yazdi Seyed Saeied Heidari , Shokri‐Kalandaragh Yaser , Bagheri Mehdi 
Published: October 2022

AbstractThe type‐4 wind turbine generators (WTGs) can provide inertial frequency response by implementing the virtual synchronous generator (VSG) concept. However, unstable torsional oscillations (TOs) would be induced in the multi‐mass‐spring drive‐train which can destabilize the entire power system. In this study, participation factor analyses are performed for a power system inclusive of a thermal unit and aggregated WTG system. The system's eigenvalues are characterized and the possible detrimental impacts of TOs on the inertia provision process and overall power system stability are demonstrated and the related stability limits are identified. A comprehensive active torsional oscillations damper (CA‐TOD) and a supercapacitor‐based energy storage system (ESS) are presented and discussed to implement the CA‐TOD. A state of charge (SoC) regulator is also employed to set the reference speed difference for the turbine‐generator. Small‐signal studies and electro‐magnetic transient (EMT) simulations are performed to evaluate the functionality of the CA‐TOD and SoC controller and estimate their impacts on the system's dynamics. The robust performance of the CA‐TOD is compared to the band‐pass filter‐based TOD by sweeping key control parameters of the VSG and emulating drive‐train parameter uncertainty. Key results are cross‐verified by EMT simulations of a multimachine power system.
Kinematic analysis of the Large Magellanic Cloud using Gaia DR3
Authors: Jiménez-Arranz Ó. , Romero-Gómez M. , Luri X. , McMillan P. J. , Antoja T. , Chemin L. , Roca-Fàbrega S. , Masana E. , Muros A. 
Published: October 2022

Context. The high quality of the Gaia mission data has allowed for studies of the internal kinematics of the Large Magellanic Cloud (LMC) to be undertaken in unprecedented detail, providing insights into the non-axisymmetric structure of its disc. Recent works by the Gaia Collaboration have already made use of the excellent proper motions of Gaia DR2 and Gaia EDR3 for a first analysis of this sort, but these were based on limited strategies aimed at distinguishing the LMC stars from the Milky Way foreground that did not use all the available information. In addition, these studies could not access the third component of the stellar motion, namely, the line-of-sight velocity – which has now become available via Gaia DR3 for a significant number of stars.
Aims. Our aim is twofold: 1) to define and validate an improved, more efficient and adjustable selection strategy to distinguish the LMC stars from the Milky Way foreground; 2) to check the possible biases that assumed parameters or sample contamination from the Milky Way can introduce in analyses of the internal kinematics of the LMC based on Gaia data.
Methods. Our selection was based on a supervised neural network classifier, using as much as of the Gaia DR3 data as possible. Based on this classifier, we selected three samples of candidate LMC stars with different degrees of completeness and purity. We validated these classification results using different test samples and we compared them with the results from the selection strategy used in the Gaia Collaboration papers, based only on the proper motions. We analysed the resulting velocity profiles and maps for the different LMC samples and we checked how these results change when we use the line-of-sight velocities that are available for a subset of stars.
Results. We show that the contamination in the samples from Milky Way stars basically affects the results for the outskirts of the LMC. We also show that the analysis formalism used in absence of line-of-sight velocities does not bias the results for the kinematics in the inner disc. Here, for the first time, we performed a kinematic analysis of the LMC using samples with the full three dimensional (3D) velocity information from Gaia DR3.
Conclusions. The detailed 2D and 3D kinematic analysis of the LMC internal dynamics demonstrate that: 1) the dynamics in the inner disc is mainly bar dominated; 2) the kinematics on the spiral arm overdensity seems to be dominated by an inward motion and a rotation that is faster than that of the disc in the part of the arm attached to the bar; 3) the contamination of Milky Way stars seem to dominate the outer parts of the disc and mainly affects old evolutionary phases; and 4) uncertainties on the assumed disc morphological parameters and line-of-sight velocity of the LMC can (in some cases) have significant effects on the results of the analysis.
Safety, Efficacy, and Predictors for Late Reintervention After Embolization of Renal Angiomyolipomas – Embolization renal angiomyolipoma
Authors: Claesen Evelien , Bonne Lawrence , Laenen Annouschka , Bammens Bert , Albersen Maarten , De Wever Liesbeth , Maleux Geert 
Published: October 2022

Purpose To retrospectively analyze the procedural and long-term clinical outcome of the selective embolization of renal angiomyolipoma. In addition, potential predictive factors for higher risk of late re-intervention were analyzed.
Methods Retrospective monocentric study, including 34 consecutive patients, analyzing the safety, efficiency, and long-term clinical outcome of catheter-directed embolization of renal AML. Additionally, the difference in postembolization renal function between patients embolized in the acute and in the elective setting was analyzed. Secondly, we also evaluated whether volume/diameter of the AML and presence of intralesional aneurysms are risk factors for late re-intervention.
Results Embolization of renal AML was performed to control volume (n = 21; 62 %) or to stop spontaneous hemorrhage (n = 13; 38 %) with angiographic success in all cases but was associated with renal abscess (n = 1) and pulmonary embolism (n = 1) without a significant difference in renal function before and after embolization (P = 0.513). Volume/diameter (P = 0.276/P = 0.21) and presence of aneurysms before embolization (P = 0.37) are not predictive for a higher risk of late re-intervention.
Conclusion Catheter-directed embolization is a safe and effective treatment modality for asymptomatic and bleeding renal AML, without a negative impact on renal function. Initial mass volume/diameter or presence/absence of intralesional aneurysms does not seem to be predictive for late re-intervention.
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Patellar Tendon Repair Using a Patellar Tendon Allograft and External Fixator in Three Dogs
Authors: Tidwell Samuel J. , Franklin Samuel P. 
Published: October 2022

Abstract
Objective The aim of this study was to report on complications and outcomes with repair of ruptured canine patellar tendons using primary tenorrhaphy coupled with patellar tendon allograft transplantation and use of a transarticular external skeletal fixator.
Materials and Methods This report includes three dogs with acutely ruptured patellar tendons, all of whom had surgical repair using a patellar tendon allograft. Dogs were assessed postoperatively by physical examination, owner input, and/or video review. Functional outcomes were classified as full, acceptable, or unacceptable based on previously established criteria.
Results Follow-up time was between 24 and 46 weeks. Two dogs obtained full function and one dog reached acceptable function. The acrylic connecting bars of the external fixator fractured and needed to be replaced in one dog. There were no other problems or complications. There was no evidence of rejection of any allograft.
Clinical Significance Primary tenorrhaphy supported by patellar tendon allograft transplantation and transarticular skeletal fixation appears to be a viable option without evidence of patellar tendon allograft rejection and acceptable or full recovery in the three dogs of this report.
Butterfly Graft Technique for Addressing the Internal Nasal Valve
Authors: Varman Rahul , Clark Madison 
Published: October 2022

AbstractNasal airway obstruction is a common presenting complaint to otolaryngology clinics, with the internal valve a commonly implicated anatomic area of obstruction. The nasal butterfly graft is a robust technique to address this subsite with good reported functional and aesthetic outcomes in both primary and secondary rhinoplasty. We describe our approach to patient evaluation, surgical candidate selection, operative technique, and outcomes assessment for this technique.
Talking with racists: insights from discourse and communication studies on the containment of far-right movements
Authors: Herzog Benno , Lance Porfillio Arturo 
Published: October 2022

AbstractThe rise of the far right is threatening the antifascist consensus that helped rebuild Europe and the world following World War II. Discourse studies have done much to further the understanding of the success as well as the fallacies of the discourses of far-right movements and have provided the means by which to comprehend right-wing communicative strategies. However, it has also been said that the reactions of the democratic majority and the mainstream media have contributed—mainly involuntarily—to the success of right-wing politics. The role of the reactions of society, the democratic majority and the mainstream media in trying to counter right-wing discourses is widely underexplored. The aim of this contribution is to understand the diverse material and symbolic effects of certain practices of political contestation. It aims to help elaborate counterstrategies against the threat of the far right and to present communicative strategies against hate. With the help of such diverse authors as Foucault, Goffman or Habermas, we will show how democratic positions seem to be in an ideological dilemma in which the speech acts that try to counter far-right discourses very often produce the opposite effect. The article can help to overcome the pitfalls and performative contradictions of some discursive practices especially in public communications.
An automated system for the assessment and grading of adolescent delinquency using a machine learning-based soft voting framework
Authors: Jenasamanta Abhinash , Mohapatra Subrajeet 
Published: October 2022

AbstractAdolescent (or juvenile) delinquency is defined as the habitual engagement in unlawful behavior of a minor under the age of majority. According to studies, the likelihood of acquiring a deviant personality increases significantly during adolescence. As a result, identifying deviant youth early and providing proper medical counseling makes perfect sense. Due to the scarcity of qualified clinicians, human appraisal of individual adolescent behavior is subjective and time-consuming. As a result, a machine learning-based intelligent automated system for assessing and grading delinquency levels in teenagers at an early stage must be devised. To solve this problem, a soft voting-based ensemble classification model has been developed that includes a Decision Tree, Multi-layer Perceptron, and Support Vector Machine as base classifiers to accurately classify teenagers into three groups based on severity levels, viz., low, medium, and high. Over the normalized structured behavioral data, the proposed soft voting-based model outperforms all other individual classifiers with 87.50% accuracy, an AUC of 0.94, 0.81 Kappa value, and an F-score of 0.88.
“The war phone”: mobile communication on the frontline in Eastern Ukraine
Authors: Horbyk Roman 
Published: October 2022

AbstractOne of the problems in the growing subfield of mediatization of war is evidence on how exactly civilian communication devices become integrated with warfare. In this article, I focus on patterns of use of mobile phones on the frontline in Eastern Ukraine. Based on qualitative in-depth interviews with Ukrainian servicemen and women, this article presents a typology for the frontline use of mobiles in the spirit of actor–network theory. The omnipresence of mobiles on the battlefield creates a set of unique participatory media practices. A variety of personal purposes, such as private communication and entertainment, are combined in the same device with wiretapping, fire targeting, minefield mapping and combat communication. Mobiles supplant old or unavailable equipment and fill gaps in military infrastructure, becoming weaponized and contributing to the hybridization of the military and the intimate, and of war and peace. These results imply the role of mobiles as a mediated extension of battlefield and question the very definition of what constitutes weapon as tool of combat.
Electronic excitation spectra of jet-cooled phenyl isocyanate, m-tolyl isocyanate, and p-phenylene diisocyanate: Assignment of the cis and trans rotational isomers
Authors: Chiba Kohei , Naganuma Yuto , Ishibashi Daisuke , Okuyama Katsuhiko 
Published: October 2022

To assign cis and trans isomers of m-tolyl isocyanate (mTI) and p-phenylene diisocyanate (pPDI) in the electronic excitation transition, we measured the time-of-flight mass-selected resonant ionization spectra of jet-cooled phenyl isocyanate (PI), mTI, and pPDI in the region of the 275 nm first ππ* absorption system. In the excitation spectra of jet-cooled mTI and pPDI, cis- and trans-rotational isomers appeared as doublets. Isomers were assigned by analyzing the methyl-group internal rotation for mTI and by applying low-frequency bending vibrations to the mutual exclusion rule between the one- and two-photon spectra for pPDI. The electronic spectra of the three molecules observed in the jet were assigned to the transition to the first ππ* and third singlet excited states with the aid of time-dependent (TD)-B3LYP/aug-cc-pVDZ and TD-CAM-B3LYP/aug-cc-pVDZ calculations. The 0 − 0 band of PI was observed at 36 354 cm−1, those of the cis and trans isomers of mTI at 36 018 and 35 853 cm−1, respectively, and those of the cis and trans isomers of pPDI at 34 437 and 34 383 cm−1, respectively. All vibronic bands were diffuse, probably because of internal conversion to two singlet nπ* states. For mTI, based on changes in the barrier height of methyl-group internal rotation upon excitation, the Hammett-σm of PI was determined to be −0.12.
Combining quasielastic neutron scattering and molecular dynamics to study methane motions in ZSM-5
Authors: Hawkins Alexander P. , Zachariou Andrea , Silverwood Ian P. , Yong Chin , Collier Paul , Todorov Ilian , Howe Russell F. , Parker Stewart F. , Lennon David 
Published: October 2022

Quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulations are applied in combination to investigate the dynamics of methane in H-ZSM-5 zeolite catalysts used for methanol-to-hydrocarbons reactions. Methane is employed as an inert model for the methanol reaction feedstock, and studies are made of the fresh catalyst and used catalysts with varying levels of coke buildup to investigate the effect of coking on reactant mobility. Measurements are made in the temperature range from 5 to 373 K. Methane mobility under these conditions is found to be extremely high in fresh ZSM-5, with the majority of movements occurring too fast to be resolved by the QENS instrument used. A small fraction of molecules undergoing jump diffusion on QENS time scales is identified and found to correspond with short-range jump diffusion within single zeolite pores as identified in MD simulations. Agreement between QENS and MD mobility measurements is found to be within 50%, validating the simulation approach employed. Methane diffusion is found to be minimally affected by moderate levels of coke buildup, while highly coked samples result in the confinement of methane to single pores within the zeolite with minimal long-range diffusion.
Growing self-assisted GaAs nanowires up to 80 μm long by molecular beam epitaxy
Authors: Becdelievre Jeanne , Guan Xin , Dudko I , Regreny Philippe , Chauvin Nicolas , Patriarche Gilles , Gendry Michel , Danescu Alexandre , Penuelas José 
Published: October 2022

Abstract
Ultralong GaAs nanowires were grown by molecular beam epitaxy using the vapor–liquid–solid method. In this ultralong regime we show the existence of two features concerning the growth kinetic and the structural properties. Firstly, we observed a non-classical growth mode, where the axial growth rate is attenuated. Secondly, we observed structural defects at the surface of Wurtzite segments located at the bottom part of the nanowires. We explain these two phenomena as arising from a particular pathway of the group V species, specific to ultralong nanowires. Finally, the optical properties of such ultralong nanowires are studied by photoluminescence experiments.
Extreme on-demand contactless modulation of elastic properties in magnetostrictive lattices
Authors: Singh A , Mukhopadhyay T , Adhikari S , Bhattacharya B 
Published: October 2022

Abstract
2D lattices are widely popular in micro-architected metamaterial design as they are easy to manufacture and provide lightweight multifunctional properties. The mechanical properties of such lattice structures are predominantly an intrinsic geometric function of the microstructural topology, which are generally referred to as passive metamaterials since there is no possibility to alter the properties after manufacturing if the application requirement changes. A few studies have been conducted recently to show that the active modulation of elastic properties is possible in piezoelectric hybrid lattice structures, wherein the major drawback is that complicated electrical circuits are required to be physically attached to the micro-beams. This paper proposes a novel hybrid lattice structure by incorporating magnetostrictive patches that allow contactless active modulation of Young’s modulus and Poisson’s ratio as per real-time demands. We have presented closed-form expressions of the elastic properties based on a bottom-up approach considering both axial and bending deformations at the unit cell level. The generic expressions can be used for different configurations (both unimorph or bimorph) and unit cell topologies under variable vertical or horizontal magnetic field intensity. The study reveals that extreme on-demand contactless modulation including sign reversal of Young’s modulus and Poisson’s ratio (such as auxetic behavior in a structurally non-auxetic configuration, or vice-versa) is achievable by controlling the magnetic field remotely. Orders of difference in the magnitude of Young’s modulus can be realized actively in the metamaterial, which necessarily means that the same material can behave both like a soft polymer or a stiff metal depending on the functional demands. The new class of active mechanical metamaterials proposed in this article will bring about a wide variety of design and application paradigms in the field of functional materials and structures.
Evanescent-field assisted photon collection from quantum emitters under a solid immersion lens
Authors: Bishop S G , Cannon J K , Yağcı H B , Clark R N , Hadden J P , Langbein W , Bennett A J 
Published: October 2022

Abstract
Solid-state quantum light sources are being intensively investigated for applications in quantum technology. A key challenge is to extract light from host materials with high refractive index, where efficiency is limited by refraction and total internal reflection. Here we show that an index-matched solid immersion lens can, if placed sufficiently close to the semiconductor, extract light coupled through the evanescent field at the surface. Using both numerical simulations and experiments, we investigate how changing the thickness of the spacer between the semiconductor and lens impacts the collection efficiency (CE). Using automatic selection and measurement of 100 s of individually addressable colour centres in several aluminium nitride samples we demonstrate spacer-thickness dependent photon CE enhancement, with a mean enhancement factor of 4.2 and a highest measured photon detection rate of 743±4kcps.
One hundred years ago Alfred Landé unriddled the Anomalous Zeeman Effect and presaged electron spin
Authors: Schmidt-Böcking Horst , Gruber Gernot , Friedrich Bretislav 
Published: October 2022

Abstract
In order to commemorate Alfred Landé’s unriddling of the anomalous Zeeman Effect a century ago, we reconstruct his seminal contribution to atomic physics in light of the atomic models available at the time. Landé recognized that the coupling of quantized electronic angular momenta via their vector addition within an atom was the origin of all the apparent mysteries of atomic structure as manifested by the anomalous Zeeman effect. We show to which extent Landé’s ideas influenced the development of quantum physics, particularly Wolfgang Pauli’s path to the exclusion principle. We conclude with Landé’s brief biography.
Simulation study of the effect of electrode embedded with magnesia-carbon material on the breakdown process in micro-gap and electric field in arc
Authors: Yan Zhaozhao , Zhang Jiongming , Liu Qiang , Yin Yanbin , Ma Haitao , Liu Huayang 
Published: October 2022

Abstract
The breakdown plays an important role in the process of arc striking, which can form an early conductive channel between electrode and molten pool. In this paper, a two-dimensional transient micro-gap breakdown model of argon gas under atmospheric pressure and a two-dimensional calculation model of electric field in arc were established, and the effect of the electrode embedded with magnesia-carbon material on the breakdown process and electric field in arc are studied. It is found that the breakdown process between the electrode and the molten pool develops in the form of positive streamer, whether using ordinary electrode or electrode embedded with magnesia-carbon material. The electrode embedded with magnesia-carbon material can accelerate the development of head of electron avalanche in the process of breakdown in micro-gap, increase the electron density of head of electron avalanche and shorten the time consumed in the process of breakdown. Under the external voltage in AC arc, the maximum value of electric field strength changes periodically, the region of the maximum value and maximum value increases with the increase of the radius of the magnesia-carbon material, resulting in serious distortion in the distribution of electric field, which can effectively reduce the breakdown voltage threshold.
Structural and spectroscopic analysis of HoMn2O5 multiferroics
Authors: Ahmad Javed , Afzal Vardah , Nissar Umair , Bukhari S H , Jamil M T , Khan J Alam , Abbas Hammad , Hina Maryam 
Published: October 2022

Abstract
HoMn2O5 was synthesized using sol-gel auto combustion method and characterized through X-ray diffraction, Fourier transform infrared reflectivity, Raman, UV–visible, Photoluminescence spectroscopies at room temperature and transport properties (utilising dc- and ac- electric fields) at high temperatures. The investigation validates the crystal structure by Rietveld refinement with orthorhombic symmetry, and structural characterizations indicated a single-phase nature (space group Pbnm). The Lorentz oscillator model fitted the reflectivity spectrum to account for the infrared active optical phonons. The Raman spectrum was also measured to calculate the optical phonons. The intermediate bandgap value (1.54 eV) of HoMn2O5 indicates its ability to absorb UV radiations and make it suitable for light harvesting material. At last, the transport (dc, ac) properties have been discussed in detail within the temperature range (293–473K) and the variable range hopping conduction mechanism is confirmed in this material.