bluuebunny/crossref_metadata_2025_split huggingface dataset:
Media events, speech events and propagandistic techniques of legitimation: a multimodal analysis of the Greek Prime Minister Kyriakos Mitsotakis’ public addresses on the SARS-CoV-2 pandemic
Authors: Poulakidakos Stamatis 
Published: October 2021

AbstractThe increased information need after the outburst of the SARS-CoV-2 pandemic has led to the enhanced role of public addresses and press conferences that can broadcast important information simultaneously to a large number of people through a number of different media outlets (TV, radio, internet). Thus, government leaders worldwide have opted for the frequent broadcast of public addresses, reviving the rationale of media events as a way to disseminate their messages concerning the pandemic as widely as possible. The current paper focuses on the Greek case, scrutinizing the public addresses of the Greek PM Kyriakos Mitsotakis in terms of both structural and content characteristics. Through the use of multimodal analysis, we figure out the visual and linguistic characteristics in K. Mitsotakis public addresses. At the same time, we setup a research framework for the qualitative and quantitative examination of similar public addresses in various countries, by combining the theories of media events, propaganda, and linguistic techniques of political legitimization. Our main findings suggest that K. Mitsotakis in his public addresses has made use of direct visual and verbal connections to aspects of “Greekness” in a nation-centric rationale. He relies predominantly on the evocation of positive sentiments and rationalization (as a means of legitimization), in order to achieve political benefits by incorporating the management of the pandemic into the Greek government’s nationalist agenda.
Climate change and food security in Sri Lanka: towards food sovereignty
Authors: Gunaratne Mahinda Senevi , Radin Firdaus R. B. , Rathnasooriya Shamila Indika 
Published: October 2021

AbstractThis study explored food security and climate change issues and assessed how food sovereignty contributes to addressing the climate change impacts on entire food systems. The study aimed to contextualise food security, climate change, and food sovereignty within Sri Lanka’s current development discourse by bringing global learning, experience, and scholarship together. While this paper focused on many of the most pressing issues in this regard, it also highlighted potential paths towards food sovereignty in the context of policy reforms. This study used a narrative review that relied on the extant literature to understand the underlying concepts and issues relating to climate change, food security and food sovereignty. Additionally, eight in-depth interviews were conducted to obtain experts’ views on Sri Lanka’s issues relating to the thematic areas of this study and to find ways forward. The key findings from the literature review suggest that climate change has adverse impacts on global food security, escalating poverty, hunger, and malnutrition, which adversely affect developing nations and the poor and marginalised communities disproportionately. This study argues that promoting food sovereignty could be the key to alleviating such impacts. Food sovereignty has received much attention as an alternative development path in international forums and policy dialogues while it already applies in development practice. Since the island nation has been facing many challenges in food security, poverty, climate change, and persistence of development disparities, scaling up to food sovereignty in Sri Lanka requires significant policy reforms and structural changes in governance, administrative systems, and wider society.
The association of opening K–12 schools with the spread of COVID-19 in the United States: County-level panel data analysis
Authors: Chernozhukov Victor , Kasahara Hiroyuki , Schrimpf Paul 
Published: October 2021

Significance
This paper examines whether the opening of K–12 schools may lead to the spread of COVID-19. Analyzing how an increase of COVID-19 cases is related to the timing of opening K–12 schools in the United States, we find that counties that opened K–12 schools with in-person learning experienced an increase in the growth rate of cases by 5 percentage points on average, controlling for a variety of policies, past infection rates, and other factors. This association of K–12 school visits with case growth is stronger when mask wearing is not mandated for staff at school. These findings support policies that promote masking and other precautionary measures at schools and giving vaccine priority to education workers.
A preliminary description of mood in Welsh
Authors: Fontaine Lise , Williams Lowri 
Published: October 2021

Abstract
In this paper we propose a functional account of the Welsh mood system, focussing on responsives in particular.
The discourse functions of responsives are interpreted through the concept of negotiation within the systemic functional
linguistic framework, which offers a rich model for accounting for both initiations and responses, including possible tracking and
challenging moves. By examining the interaction of mood together with specific features of Welsh, e.g. a dominant VSO clause
ordering, mood particles, Subject ellipsis and a complex system of negation, we are able to show that Welsh tends to highlight
interpersonal meanings in clause initial position. As the first functional description of Welsh, we also set out important
directions for future research, based on the findings presented in this paper.
Inner-shell photoionization of free and confined Mg in the region of the 2p thresholds
Authors: Padukka P , Zhou H-L , Gorczyca T W , Manson S T 
Published: October 2021

Abstract
Photoionization of the free and confined Mg (Mg@C60) have been calculated in the vicinity of the inner-shell 2p thresholds using R-matrix at the Breit–Pauli R-matrix level with a particular emphasis on the various resonance series leading up to the two lowest inner-shell thresholds and the changes resulting from the confinement. For free Mg, the calculated resonance positions agree well with NIST values, and a number of new resonances are identified. For confined Mg, the calculation was done for various depths of the confining potential well in order to follow the trajectories of the resonances as a function of well depth. The results for the well depth corresponding to Mg@C60 showed that most of the resonances moved to higher photon energy, as a result of the confinement, but a few moved to lower energies. This phenomenology was found to result from the fact that the 3p, 3d and 4s excitations are trapped by the confining potential well, while the higher excitations were not.
Dynamical particle ratio fluctuations in Au + Au interaction at E
lab
= 30 A GeV using transport models
Authors: Ghosh S , Pal I , Thakur J , Mukhopadhyay A , Mali P 
Published: October 2021

Abstract
We present a simulation study on the dynamical fluctuations of conserved charges in a baryon-rich environment that is expected to be created in high-energy nucleus–nucleus (AB) collisions. Microscopic transport models like the ultra-relativistic quantum molecular dynamics and a multi-phase transport model are used to generate Au + Au collision events at an incident beam energy of 30 A GeV in the laboratory system. We investigate the centrality and rapidity window size dependence of the event-by-event (e-by-e) fluctuations of the multiplicity ratios of particles belonging to different species. It is observed that e-by-e dynamical fluctuations in the K/π, K/p and π/p ratios diminish with increasing centrality. Our results in this regard indicate that an AB collision can not be viewed as a mere superposition of many incoherent nucleon–nucleon (NN) collisions. Similarly, due to diffusion process the dynamical fluctuations get diluted with increasing window size of rapidity. The simulation results in general could be interpreted in terms of conventional mechanisms of particle production like resonance decays. Our simulation based analysis provides a useful reference baseline to the compressed baryonic matter experiment to be held at the Facility for Antiproton and Ion Research (FAIR).
Berry curvature induced magnetotransport in 3D noncentrosymmetric metals
Authors: Pal Ojasvi , Dey Bashab , Ghosh Tarun Kanti 
Published: October 2021

Abstract
We study the magnetoelectric and magnetothermal transport properties of noncentrosymmetric metals using semiclassical Boltzmann transport formalism by incorporating the effects of Berry curvature (BC) and orbital magnetic moment (OMM). These effects impart quadratic-B dependence to the magnetoelectric and magnetothermal conductivities, leading to intriguing phenomena such as planar Hall effect, negative magnetoresistance (MR), planar Nernst effect and negative Seebeck effect. The transport coefficients associated with these effects show the usual oscillatory behavior with respect to the angle between the applied electric field and magnetic field. The bands of noncentrosymmetric metals are split by Rashba spin–orbit coupling except at a band touching point (BTP). For Fermi energy below (above) the BTP, giant (diminished) negative MR is observed. This difference in the nature of MR is related to the magnitudes of the velocities, BC and OMM on the respective Fermi surfaces, where the OMM plays the dominant role. The absolute MR and planar Hall conductivity show a decreasing (increasing) trend with Rashba coupling parameter for Fermi energy below (above) the BTP.
Atomic configurations and energies of Mg symmetric tilt grain boundaries: ab initio local analysis
Authors: Xu Zhuo , Tanaka Shingo , Kohyama Masanori 
Published: October 2021

Abstract
Mg alloys are highly expected for the wide application in the next-generation industry, while significant improvement of the plasticity of polycrystalline Mg alloys is crucial. For this purpose, it is essential to get insights into the atomic configurations, energetics, and mechanical responses of Mg grain boundaries (GBs). In this study, we investigated the overall features of atomic configurations and energies of

[

1

1

¯

00

]

and

[

1

2

¯

10

]

symmetric tilt GBs in hcp Mg by density-functional theory. We systematically constructed atomic models of coincidence-site lattice GBs by the arrangement of structural units in the full range of rotation angles. We observed that special GBs show clear cusps in both the GB-energy and excess-volume curves against the rotation angle. The reason of the stability/instability of each GB configuration was analyzed by ab initio local energy and local stress based on Bader partitioning. The features of local energies and stresses in Mg GBs are quite different from those in other materials with covalent or partial-covalent bonding nature. We observed substantial variations of local energies, local stresses and Bader charges of GB atoms, and charge inhomogeneity in a GB region, reflecting the structural disorder. Stable GBs are characterized by modest ranges of such variations and by moderate charge homogeneity. These results could be utilized in general to understand the interface stability and deformation mechanism of Mg and other simple metals.
Fractional elliptic systems with critical nonlinearities
Authors: Bhakta Mousomi , Chakraborty Souptik , Miyagaki Olimpio H , Pucci Patrizia 
Published: October 2021

Abstract
This paper deals with existence, uniqueness and multiplicity of positive solutions to the following nonlocal system of equations:

(

−
Δ

)

s

u
=

α

2

s

*

|
u

|

α
−
2

u
|
v

|

β

+
f

(

x

)

in

R

N

,

(

−
Δ

)

s

v
=

β

2

s

*

|
v

|

β
−
2

v
|
u

|

α

+
g

(

x

)

in

R

N

,

u
,

v
>
0

in

R

N

,

(

S

)

where 0 < s < 1, N > 2s, α, β > 1, α + β = 2N/(N − 2s), and f, g are nonnegative functionals in the dual space of

H

˙

s

(

R

N

)

, i.e.,

〈

(

H

˙

s

)

′

f

,
u

〉

H

˙

s

⩾
0

, whenever u is a nonnegative function in

H

˙

s

(

R

N

)

. When f = 0 = g, we show that the ground state solution of

(

S

)

is unique. On the other hand, when f and g are nontrivial nonnegative functionals with ker(f) = ker(g), then we establish the existence of at least two different positive solutions of

(

S

)

provided that

‖
f

‖

(

H

˙

s

)

′

and

‖
g

‖

(

H

˙

s

)

′

are small enough. Moreover, we also provide a global compactness result, which gives a complete description of the Palais–Smale sequences of the above system.
Thermal stability of quasi-isotropic strands with different cross-sections and with/without metal sheaths
Authors: Zhang Guangyi , Wang Yinshun , Liu Wei , Wang Jian , Wang Jiawen 
Published: October 2021

Abstract
This paper mainly focuses on the thermal stability performance, such as minimum quench energy (MQE) and normal zone propagation velocity (NZPV), of a quasi-isotropic strand (Q-IS) with three different configurations made from 2G high-temperature superconducting (HTS) tapes in the adiabatic approximation. Due to the anisotropic performance of thermal conductivity in 2G HTS tapes, the tensor form of the heat conduction equation was used instead of conventional isotropic forms. We first measured the MQE and NZPV of three strands in the adiabatic approximation. Subsequently, the experimental results were verified by finite element analysis and compared with the values of MQE and NZPV in a liquid nitrogen (LN2) bath. Finally, the effect of a metal sheath on the current distribution and generation of Joule heat during the quench process were analyzed through simulation. The results show that the arc-shaped aluminum filler brings slightly higher thermal stability of Q-IS while the copper sheath largely improves stability. Moreover, compared with the thermal stability of the strand fully exposed to the LN2 bath, for the strand in the adiabatic approximation, the MQE decreases a lot while the maximum of NZPV is increased by 2–3 times.
Measurement of (n,α) and (n,2n) reaction cross sections at a neutron energy of 14.92 ± 0.02 MeV for potassium and copper with uncertainty propagation *
Authors: Gandhi A. , Sharma Aman , Pachuau Rebecca , Singh Namrata , Danu L. S. , Suryanarayana S. V. , Nayak B. K. , Kumar A. 
Published: October 2021

Abstract
Experimentally measured neutron activation cross sections are presented for the

(n,α)

,

(n,α)

, and

(n,2n)

reactions with detailed uncertainty propagation. The neutron cross sections were measured at an incident energy of 14.92 ± 0.02 MeV, and the neutrons were based on the t(d,n)α fusion reaction. The

(n,α)

reaction was used as a reference reaction for the normalization of the neutron flux. The pre-calibrated lead-shielded HPGe detector was used to detect the residues' γ-ray spectra. The data from the measured cross sections are compared to the previously measured cross sections from the EXFOR database, theoretically calculated cross sections using the TALYS and EMPIRE codes, and evaluated nuclear data.
Improve P300-speller performance by online tuning stimulus onset asynchrony (SOA)
Authors: Gao Pin , Huang Yihao , He Feng , Qi Hongzhi 
Published: October 2021

Abstract

Objective. The P300-Speller is a classic brain–computer interface paradigm that has been subjected to numerous clinical trials. Some studies have reported that the performance of the P300-Speller is closely related to stimulus onset asynchrony (SOA), but very few studies have attempted to improve the performance of the P300-Speller by optimizing SOA. Approach. In this paper, we designed a P300-Speller system based on a variable SOA and dynamic stop strategy, which can automatically adjust SOA according to real-time operational performance. Main results. The online experiment results of 18 subjects showed that the event-related potential classifier and the dynamic stop algorithm established at 200 ms SOA can maintain the performance at a certain level among 50–300 ms SOA. The system can then reduce the SOA from an initial 200 ms to an average of about 98.5 ms while maintaining letter output accuracy. The average theoretical information transfer rate was significantly improved from 42.4 to 85 bit min−1 (the maximum was 232 bit min−1). Significance. These results demonstrate that the system established in this paper can automatically optimize the SOA settings, and this personalized SOA adjustment can effectively improve the performance of the P300-Speller.
Stellarator coil design using cubic splines for improved access on the outboard side
Authors: Lonigro Nicola , Zhu Caoxiang 
Published: October 2021

Abstract
In recent years many efforts have been undertaken to simplify coil designs for stellarators due to the difficulties in fabricating non-planar coils. The FOCUS code removes the need for a winding surface and represents the coils as arbitrary curves in 3D. In the following work, the implementation of a spline representation for the coils in FOCUS is described, along with the implementation of a new engineering constraint to design coils with a straighter outer section. The new capabilities of the code are shown as an example on HSX, NCSX, and a prototype quasi-axisymmetric reactor-sized stellarator. The flexibility granted by splines along with the new constraint will allow for stellarator coil designs with improved accessibility and simplified maintenance.
Towards fully-predictive transport modelling in ASDEX Upgrade H-modes
Authors: Tardini G. , Angioni C. , Kiefer C.K. , Luda T. , Bonanomi N. , Dunne M. , Fable E. , Ryter F. , the ASDEX Upgrade Team  
Published: October 2021

Abstract
The common way to predict energy confinement in future devices such as ITER is to use scaling laws, based on parameters regression of large cross-machine databases. However, this approach is limited: the regression variables are not purely engineering parameters, physics quantities such as the plasma density n
e are also input; power regressions fail to capture important physics such as regime transitions; profile effects such as T
i/T
e or reverse magnetic shear are not retained. As a consequence, the scatter is large, but even some dependences are known to be of limited validity, such as the n
e or P dependences of the IPB98(y, 2) scaling. Dimensionless physics, if validated, provides a reliable basis for predicting confinement in a future device. However, there are no experimental data to use as boundary condition, nor empirical knowledge based on that device. Also, the use of full gyro-kinetic codes with all relevant ingredients is computationally unfeasible for a full-radius modelling. Integrated modelling with the recently developed IMEP workflow allows to simulate from the separatrix to the plasma centre, without making use of any experimental input. Although physics-based models are used to predict core transport, core transport is shown to be predicted with less accuracy than the pedestal energy. Therefore, we validate the most established quasi-linear models TGLF and QuaLiKiZ in different regimes and experimental conditions, assessing their strengths and limits. The quasi-linear models are shown to predict transport accurately in a variety of experimental conditions, including dominant ion and electron heating, respectively. The well-known shortcoming near the pedestal top is solved, while a new collision operator in the QuaLiKiZ model improves the electron temperature simulation significantly. Also the Neural Network version of QuaLiKiZ, with very fast computation time, appears to be well applicable in ion heated H-modes.
Fast collective evasion in self-localized swarms of unmanned aerial vehicles
Authors: Novák Filip , Walter Viktor , Petráček Pavel , Báča Tomáš , Saska Martin 
Published: October 2021

Abstract
A novel approach for achieving fast evasion in self-localized swarms of unmanned aerial vehicles (UAVs) threatened by an intruding moving object is presented in this paper. Motivated by natural self-organizing systems, the presented approach of fast and collective evasion enables the UAV swarm to avoid dynamic objects (interferers) that are actively approaching the group. The main objective of the proposed technique is the fast and safe escape of the swarm from an interferer discovered in proximity. This method is inspired by the collective behavior of groups of certain animals, such as schools of fish or flocks of birds. These animals use the limited information of their sensing organs and decentralized control to achieve reliable and effective group motion. The system presented in this paper is intended to execute the safe coordination of UAV swarms with a large number of agents. Similar to natural swarms, this system propagates a fast shock of information about detected interferers throughout the group to achieve dynamic and collective evasion. The proposed system is fully decentralized using only onboard sensors to mutually localize swarm agents and interferers, similar to how animals accomplish this behavior. As a result, the communication structure between swarm agents is not overwhelmed by information about the state (position and velocity) of each individual and it is reliable to communication dropouts. The proposed system and theory were numerically evaluated and verified in real-world experiments.
Structural, dielectric, impedance, complex modulus, and optical study of Ni-doped Zn(1−x)NixO nanostructures at high temperatures
Authors: Ahmad Fiaz , Maqsood Asghari 
Published: October 2021

Abstract
This experiment addressed the effect of Nickel-doped on the dielectric, ac conductivity, and optical properties of pure and doped Zn (1−x) Nix O (x = 0, 3 and 6%) nanostructures. The un-doped and Ni-doped ZnO nanostructures were synthesized using co-precipitation. In this paper, the frequency-dependent dielectric and the electrical conductivity of un-doped and Ni-doped Zn (1−x) Nix O nanostructures were examined at various temperatures ranging from 320 K to 460 K using an LCR meter. For the morphological and optical investigation, the prepared samples were analyzed using field emission-scanning electron microscopy (FE-SEM), and UV visible Spectroscopy was used at room temperature. The dielectric constant (

ε
′

), dielectric loss (

ε

″

), tangent loss (tan δ), the real as well as the imaginary part of the impedance against the frequency ranging from 100 Hz to 2 × 106 Hz that declines with increases in frequency at different temperatures ranging from 320–460 K. However, the electrical conductivity (

σ

a
c

) increased with the increase in frequency was examined. The ac conductivity (

σ

a
c

) follows Jonscher,s power law that the electrical conductivity is enhanced with increasing doping concentration. The optical transmission area also improved due to an increase in Ni-doping concentration in ZnO. The optical bandgap of pure and Ni-doped ZnO nanostructures is in the range lies 3.30–3.12 eV found that to decrease with the increase in Ni doping concentrations.
Study on mechanism of carbonaceous gold ore during oxidation roasting by kinetics: phase transformation and structure evolution
Authors: Li Hui , Jin Jianping , Han Yuexin , Xiao Wei , Zhou Zhenya 
Published: October 2021

Abstract
The pretreatment and effective utilization of carbonaceous gold ore is of significant to refractory gold resources. In this work, the calcination kinetics was employed to investigate the relationship between phase transformation and structure evolution of carbonaceous gold ore during roasting process. Mechanism functions were determined and the fact that roasting process was controlled by chemical reaction in the initial 90 min and dominated by internal diffusion as time reached to 120 min was uncovered. In addition, the apparent activation energies for initial and latter roasting stage were 212.11 kJ·mol−1 and 163.73 kJ·mol−1, respectively. Combined with the analysis of phase transformation and structure evolution, the removal of carbonaceous matter and appearance of new tiny pores contributed to the change of calcination kinetics. Moreover, phase transformation and structure evolution were beneficial for elevating Au recovery during leaching experiment. These findings helped to understand the mechanism of carbonaceous minerals during roasting and provided new insight for the utilization of refractory gold resource.