bluuebunny/crossref_metadata_2025_split huggingface dataset:
Transverse kink oscillations of inhomogeneous prominence threads: Numerical analysis and Hαforward modelling
Authors: Martínez-Gómez David , Soler Roberto , Terradas Jaume , Khomenko Elena 
Published: November 2021

Context.Prominence threads are very long and thin flux tubes that are partially filled with cold plasma. Observations have shown that transverse oscillations are frequent in these solar structures. The observations are usually interpreted as the fundamental kink mode, while the detection of the first harmonic remains elusive.Aims.The properties of oscillations in threads are greatly affected by the density distribution along the flux tube. Here, we aim to study how the density inhomogeneities in the longitudinal and radial directions modify the periods and damping times of kink oscillations and how this effect would be reflected in the observations.Methods.We solved the ideal magnetohydrodynamics equations using two different methods: (a) performing 3D numerical simulations and (b) solving a 2D generalised eigenvalue problem. We studied the dependence of the periods, damping times, and amplitudes of transverse kink oscillations on the ratio between the densities at the centre and at the ends of the tube, and also on the average density. We applied forward modelling to our 3D simulations to compute synthetic Hαprofiles.Results.We confirm that the ratio of the period of the fundamental oscillation mode to the period of the first harmonic increases as the ratio of the central density to the footpoint density is increased, or as the averaged density of the tube is decreased. We find that the damping times due to resonant absorption decrease as the central-to-footpoint density ratio increases. Contrary to the case of longitudinally homogeneous tubes, we find that the damping-time-to-period ratio also increases as the density ratio is increased or the average density is reduced. We present snapshots and time-distance diagrams of the emission in the Hαline.Conclusions.The results presented here have implications for the field of prominence seismology. While the Hαemission can be used to detect the fundamental mode, the first harmonic is barely detectable in Hα. This may explain the lack of detections of the first harmonic. A combination of different spectral lines is required to obtain information about the period ratio and to use it to infer physical properties of the threads.
Approach to Radiculopathy
Authors: Mustafa Rafid , Kissoon Narayan R. 
Published: November 2021

AbstractLow back pain and neck pain, often with associated radiculopathy, are two of the most common reasons for referral to the outpatient neurology clinic. A thorough clinical evaluation remains paramount in establishing an accurate diagnosis and subsequently an appropriate treatment plan. In this article, we review anatomic considerations for spondylotic radiculopathy; outline the clinical approach for the evaluation of these patients, including discussion of electrodiagnostic and imaging modalities; and address treatment options based on a stratified treatment approach.
Discrete dynamic pricing and application of network revenue management for FlixBus
Authors: Barz Christiane , Laumer Simon , Freyschmidt Marcel , Martínez-Blanco Jesús 
Published: November 2021

AbstractWe consider a real discrete pricing problem in network revenue management for FlixBus. We improve the company's current pricing policy by an intermediate optimization step using booking limits from standard deterministic linear programs. We pay special attention to computational efficiency. FlixBus' strategic decision to allow for low-cost refunds might encourage large group bookings early in the booking process. In this context, we discuss counter-intuitive findings comparing booking limits with static bid price policies. We investigate the theoretical question whether the standard deterministic linear program for network revenue management does provide an upper bound on the optimal expected revenue if customer's willingness to pay varies over time.
Love thy ‘populist’
Authors: Čapinská Barbora 
Published: November 2021

Abstract
This article aims to deepen our understanding of scandals involving both transgression of accepted speech and
populist logic by analysing the origins, development, and outcome of a 2018 Czech media controversy. The scandal erupted when a
public service radio station was accused of airing pornographic content. It escalated when the accuser added a xenophobic,
homophobic and nativist commentary to his complaint. By analysing each party’s arguments, the contested and silenced ideas, and
the fantasmatic dimension, I demonstrate how each actor contributed to the escalation of the conflict and facilitated a shift in
accepted public conduct. I propose to view such scandals as attempts to break hegemonic silence that reveal the lack of acceptance
of a new norm, in this case homosexuality. I conclude that such scandals can support dialogue and reduce the polarization of
society if dissenting views are taken into consideration and divisive language avoided by all sides.
Polymedia in interaction
Authors: Androutsopoulos Jannis 
Published: November 2021

AbstractThis Special Issue on “Polymedia in interaction” theorizes and empirically investigates practices and ideologies of digitally mediated interaction under conditions of polymedia. We argue that the proliferation of mobile interpersonal communication in the 2010s calls for, and is reflected in, conceptual and methodological shifts in empirical research on digital language and communication in pragmatics and sociocultural linguistics. In this introduction, these shifts are crystallized in five interrelated themes: (1) a turn from ‘computer-mediated communication’ to ‘digitally mediated interaction’ as a bracket category; (2) a move beyond the on/offline divide and focus on the integration of mediated interaction in everyday communication in micro-units of social structure (e.g. transnational families, business or academic communication); (3) an empirical downscaling towards private and small-scale public data; (4) a shift from the study of single modes of digital communication to polymedia; and (5) a focus on semiotic repertoires and registers of digital mediation. Research that orients to (some or all of) these focal points is compared with other trends in digital language research, including computational methods. The papers in this issue flesh out these five dimensions with findings from qualitative research, based on multi-sited linguistic and digital ethnographies in various sociolinguistic settings.
Validation of evaporation-determined model of arc-cathode coupling in the peak current phase in pulsed GMA welding
Authors: Simon Marek , Mokrov Oleg , Sharma Rahul , Reisgen Uwe , Zhang Guokai , Gött Gregor , Uhrlandt Dirk 
Published: November 2021

Abstract
A first experimental validation of the evaporation-determined arc-cathode coupling (EDACC) model is performed by comparing the experimental and simulated current in the peak current phase of a pulsed gas metal arc welding process. For this, the EDACC model was extended to limit the cathode surface temperature to a realistic value of <2400 K. The information on the plasma for the EDACC model was gathered from literature and extrapolated and extended according to qualitative reasoning. The information on the cathode surface of the EDACC model was derived from a steady-state simulation of the weld pool, using an averaging approach over time for the energy and current. The weld pool surface temperature was compared to pyrometric measurements, that were performed for this work, and the agreement was found to be fair. The observed agreement between the modeled and experimentally determined current was within 10%. As strong assumptions were made for the comparison, the validation cannot be considered as final, but the assumptions are thoroughly analyzed and discussed. However the critical link between surface temperature, plasma temperature and total current transmitted could be reconstructed.
A vision transformer for emphysema classification using CT images
Authors: Wu Yanan , Qi Shouliang , Sun Yu , Xia Shuyue , Yao Yudong , Qian Wei 
Published: November 2021

AbstractObjective. Emphysema is characterized by the destruction and permanent enlargement of the alveoli in the lung. According to visual CT appearance, emphysema can be divided into three subtypes: centrilobular emphysema (CLE), panlobular emphysema (PLE), and paraseptal emphysema (PSE). Automating emphysema classification can help precisely determine the patterns of lung destruction and provide a quantitative evaluation.Approach. We propose a vision transformer (ViT) model to classify the emphysema subtypes via CT images. First, large patches (61×61) are cropped from CT images which contain the area of normal lung parenchyma, CLE, PLE, and PSE. After resizing, the large patch is divided into small patches and these small patches are converted to a sequence of patch embeddings by flattening and linear embedding. A class embedding is concatenated to the patch embedding, and the positional embedding is added to the resulting embeddings described above. Then, the obtained embedding is fed into the transformer encoder blocks to generate the final representation. Finally, the learnable class embedding is fed to a softmax layer to classify the emphysema.Main results. To overcome the lack of massive data, the transformer encoder blocks (pre-trained on ImageNet) are transferred and fine-tuned in our ViT model. The average accuracy of the pre-trained ViT model achieves 95.95% in our lab’s own dataset, which is higher than that of AlexNet, Inception-V3, MobileNet-V2, ResNet34, and ResNet50. Meanwhile, the pre-trained ViT model outperforms the ViT model without the pre-training. The accuracy of our pre-trained ViT model is higher than or comparable to that by available methods for the public dataset.Significance. The results demonstrated that the proposed ViT model can accurately classify the subtypes of emphysema using CT images. The ViT model can help make an effective computer-aided diagnosis of emphysema, and the ViT method can be extended to other medical applications.
Investigation of degradation mechanism after negative bias temperature stress in Si/SiGe channel metal–oxide–semiconductor capacitors induced by hydrogen diffusion
Authors: Ciou Fong-Min , Chang Yen-Cheng , Chen Po-Hsun , Lin Chien-Yu , Lin Yun-Hsuan , Chen Kuan-Hsu , Jin Fu-Yuan , Lin Yu-Shan , Hung Wei-Chun , Chang Kai-Chun , Kuo Ting-Tzu , Yeh Chien-Hung , Chang Ting-Chang 
Published: November 2021

Abstract
In this research, based on I–V and C–V measurement at different temperatures, the interface defect density in the device with the Si/SiGe channel was discussed. In addition, negative bias temperature instability (NBTI) is also studied. In previous research, most of the flat-band voltage (V
FB) shifts during NBTI stress was attributed to hole injection. In this article, however, the release of atomic hydrogen from the Si–H bonds at the SiO2/Si interface and at the SiGe interface produces a fixed oxide charge, which causes V
FB shifts which vary with material.
Novel anomalous diffusion phenomena of underdamped Langevin equation with random parameters
Authors: Chen Yao , Wang Xudong 
Published: November 2021

Abstract
The diffusion behavior of particles moving in complex heterogeneous environment is a very topical issue. We characterize particle’s trajectory via an underdamped Langevin system driven by a Gaussian white noise with a time dependent diffusivity of velocity, together with a random relaxation timescale τ to parameterize the effect of complex medium. We mainly concern how the random parameter τ influences the diffusion behavior and ergodic property of this Langevin system. Besides, the comparison between the fixed and random initial velocity v
0 is conducted to show the effect of different initial ensembles. The heavy-tailed distribution of τ with finite mean is found to suppress the decay rate of the velocity correlation function and promote the diffusion behavior, playing a competition role to the time dependent diffusivity. More interestingly, a random v
0 with a specific distribution depending on random τ also enhances the diffusion. Both the random parameters τ and v
0 influence the dynamics of the Langevin system in a non-obvious way, which cannot be ignored even they have finite moments.
Charged black holes in the infinite derivative theory of gravity
Authors: Xiao Yong , Zhang Longting 
Published: November 2021

Abstract
The infinite derivative theory of gravity is a generalization of Einstein gravity with many interesting properties, but the black hole solutions in this theory are still not fully understood. In the paper, we concentrate on studying the charged black holes in such a theory. Adding the electromagnetic field part to the effective action, we show how the black hole solutions around the Reissner–Nordström metric can be solved perturbatively and iteratively. We further calculate the corresponding temperature, entropy and electrostatic potential of the black holes and verify the first law of thermodynamics.
Universal single-server blind quantum computation for classical clients
Authors: Xu Hai-Ru , Wang Bang-Hai 
Published: November 2021

Abstract
Blind quantum computation (BQC) allows a client without enough quantum technologies to delegate her quantum computation to a remote quantum server, while keeping her input, output and algorithm secure. In this paper, we propose a universal single-server and almost-classical-client BQC protocol. In this protocol, the client interfaces with only one server and the only ability of the client required is to get particles from the trusted center and forward them to the server. We present an analysis of this protocol and modify it to a universal single-server and fully-classical-client BQC protocol by improving the ability of the trusted center. Based on our protocols and recent works, a new ‘Cloud + Certificate Authority (CA)’ style is proposed for the BQC.
Influence of LDA+U on band dispersion in monolayer MCl2 (M: Fe, Co)
Authors: Prayitno T B , Budi E , Fahdiran R 
Published: November 2021

Abstract
We investigated the effect of LDA+U on the band dispersions in 1T monolayer FeCl2 and CoCl2 within the self-consistent noncollinear calculation. As shown in the band dispersed, FeCl2 is metallic while CoCl2 is insulating. When the effective Coulomb energy takes into account, FeCl2 is metallic without band gap while the band gap in CoCl2 increases as the Coulomb energy increases. Thus, the band gap in CoCl2 can be effectively controlled by the Coulomb energy, thus it is feasible for spontaneous development.
Model Selection in Peptide-receptor Radionuclide Therapy for an Accurate Determination of Time Integrated Activity Coefficients
Authors: Atikah N , Riana A , Dwi A , Anwari Z , Misrawati  , Hardiansyah D 
Published: November 2021

Abstract
Calculation of accurate time-integrated activity coefficients (TIACs) is desirable in nuclear medicine dosimetry. The accuracy of the calculated TIACs is highly dependent on the fit function. However, systematic studies of determining a good function for peptide-receptor radionuclide therapy (PRRT) in different patients have not been reported in the literature. The aim of this study was to individually determine the best function for the calculation of TIACs in tumor and kidneys using a model selection based on the goodness of fit criteria and Corrected Akaike Information Criterion (AICc). The data used in this study was pharmacokinetic data of 111In-DOTATATE in tumor and kidneys obtained from 4 PRRT patients. Eleven functions with various parameterizations were formulated to describe the biokinetic data of 111In-DOTATATE in tumor and kidneys. The model selection was performed by choosing the best function from the function with sufficient goodness of fit based on the smallest AICc. Based on the results of model selection, function A
1
-(λ
1+λphys
)t
was selected as the best function for all tumor and kidneys in patients with meningioma tumors. By using this function, the calculated of TIACs could be more accurate for future patients with meningioma tumor.
Pseudo-hermitian random matrix theory: a review
Authors: Feinberg Joshua , Riser Roman 
Published: November 2021

Abstract
We review our recent results on pseudo-hermitian random matrix theory which were hitherto presented in various conferences and talks. (Detailed accounts of our work will appear soon in separate publications.) Following an introduction of this new type of random matrices, we focus on two specific models of matrices which are pseudo-hermitian with respect to a given indefinite metric B. Eigenvalues of pseudo-hermitian matrices are either real, or come in complex-conjugate pairs. The diagrammatic method is applied to deriving explicit analytical expressions for the density of eigenvalues in the complex plane and on the real axis, in the large-N, planar limit. In one of the models we discuss, the metric B depends on a certain real parameter t. As t varies, the model exhibits various ‘phase transitions’ associated with eigenvalues flowing from the complex plane onto the real axis, causing disjoint eigenvalue support intervals to merge. Our analytical results agree well with presented numerical simulations.
Surface characterization of laser-induced molten area in micro-grooving of silicon by ultraviolet (UV) laser
Authors: Raman N S A , Nordin I H W , Majid M S A , Razlan Z M , Abdullah S S C 
Published: November 2021

Abstract
The objective of this research is to understand the fundamental mechanisms that govern the formation of laser-induced molten area during the micro-grooved fabrication on silicon material. In this research work, micro grooves were fabricated on silicon wafer by using ultraviolet (UV) laser of 248nm wavelength. Influence of lasing parameters such as pulse duration, laser pulse energy and scanning speed on the surface of micro-grooved was characterized. It is found that, the width of the micro grooves become wider with increasing laser pulse energy when ultraviolet laser was irradiated on silicon material. On the other hand, heat affected zone (HAZ) can be found at the surface of micro groove line at high pulse energy, high pulse repetition rate and lower scanning speed irradiation condition. This is considered due to the excessive heat input of the laser irradiation condition. It is concluded that proper selection of laser processing parameters of pulse energy, E, pulse repetition rate, R

p
, and scanning speed is necessary to achieve high quality micro-grooves.
Numerical analysis of Darrieus vertical axis wind turbine using omni-direction guide vane
Authors: Sathiyamoorthy K , Nandha Sri Varma N , Showrinath M 
Published: November 2021

Abstract
The performance of Darrieus turbine is studied in this paper with the attachment of ODGV to enhance its performance. The angles of guided vanes are chosen from the literature as α=20° beta=55°. According to this hypothesis the airfoil section of S1046 chosen for performance analysis. The K-ε SST 2 equation model is used for generating the moment for 5 blades turbine with the radius of 0.25m in the 2D configuration. The Chord length is chosen as 78mm and Air velocity is considered as 6m/s for the entire transient simulation. The study of performance and operational parameters have been done on turbine with presence and absence of ODGV.
Optimal Allocation Algorithm of Grid Side Energy Storage Capacity under Large Scale Wind Farm Connection
Authors: Ma Junpeng , Sha Jianjun , Liu Feiyan 
Published: November 2021

Abstract
For grid energy storage capacity configuration is not reasonable, problems such as instability in crossing the river power fluctuations, are proposed based on a large scale wind power grid side under the condition of energy storage capacity of the optimal allocation algorithm, through the use of large-scale wind farm access method to achieve the optimal design of power grid model, so as to quickly solve the micro grid energy storage capacity planning cost and energy consumption data, according to the results. The operation parameters, energy loss and other numerical values of the model in the power grid are controlled, and according to the calculation results. Finally, the experiment proves that the optimization configuration algorithm of the power grid side energy storage capacity under the large-scale wind farm access has higher practicability and accuracy in the practical application process, and fully meets the research requirements.
Research on Site Selection Method of Battery Energy Storage System Based on Critical CutSet Identification
Authors: Zeng Jingjie , Li Peiqiang , Zhang Zhongkai , Liu Xinke 
Published: November 2021

Abstract
Under different operating conditions, the influence of energy storage battery on the power grid is different, and the location and capacity determination methods are also different. Therefore, how to scientifically and reasonably select the location is of great significance. This paper proposes a candidate set identification method for the most vulnerable branch and critical cut set of power system transient stability based on branch potential energy, and uses the improved comprehensive index to identify the critical cut set. This method does not need to wait for the end of time domain simulation to determine the most vulnerable lines and critical cut sets, thus providing the basis for the location of battery energy storage system (BESS). Through the power system comprehensive analysis program (PSASP) simulation, the accuracy of theoretical analysis and engineering practicability are verified.
Research on the full-load joint regulation strategy of coal-fired generating units and electrolyzed hydrogen production
Authors: Sun Haijie , Ren Jianxing , Li Fangqin , Cheng Mengping , Wang Ze 
Published: November 2021

Abstract
As the installed capacity of wind power and other renewable energy sources continues to increase, the intermittent and volatility of their output has put tremendous pressure on the safe and stable operation of the power grid. The demand for peak shaving is becoming increasingly urgent. In this paper, the electrolysis hydrogen production system participates in the deep peak shaving of coal-fired generators. Through the participation of load regulation of the electrolysis hydrogen production system, according to the requirements of the power grid on the different loads of the unit, the load of the electrolysis hydrogen production system is adjusted to adjust the load of the unit. In order to realize full-load regulation of coal-fired thermal power plants and improve the power generation efficiency of units.
Test and Research on Noise Distribution Characteristics of 220kV Oil-immersed Transformer
Authors: Ma Yuchao , Mo Juan , Han Li , Li Xiang , Xiao Qingming 
Published: November 2021

Abstract
Large power transformer is the main noise source of substation. With the increase of voltage grade and rated capacity, the noise radiation value of power equipment continues to increase, which has a great influence on the noise standard of substation boundary. In this paper, two test conditions of no-load voltage and load current are considered. The transformer noise testing datum is constructed. The distribution law of factory noise SPL of 220kV oil-immersed transformer is obtained. The test results provide accurate test data for transformer factory noise evaluation.