bluuebunny/crossref_metadata_2025_split huggingface dataset:
Video analysis of a massive coiled spring transverse oscillations described by Fourier series
Authors: de Jesus V L B , Haubrichs C , de Oliveira A L , Sasaki D G G 
Published: July 2022

Abstract
This work presents a low-cost and straightforward experiment to visualise Fourier synthesis using a coiled metallic spring whose weight is not negligible, oscillating in a vertical plane and fixed at both ends. A massive coiled spring still obeys the standard linear differential wave equation, but a new term accounting for the effect of gravity must be introduced in the equation. Hence, if the spring is plucked vertically at its centre so that its initial configuration is a triangle, the trapezoidal shape of the resulting oscillation, typical of a spring of negligible mass, is clearly distorted by the effect of gravity, when the amplitude of the oscillation moves away from its maximum value. The hypothesis that this distortion comes from some nonlinear effect produced by the larger pluck-length ratio used in the experiment was discarded when evaluating the magnitude of a mathematical criterion to estimate the nonlinear impact of oscillations with large amplitudes. As the spring’s tension is small (∼4 N, on average) and the frequencies of transverse waves are low (close to 1 Hz), oscillations could be filmed with a basic and cheap camera (60 fps), which makes it possible to carry out the experiment without the need to purchase equipment. In addition, as the frequencies involved are low, the oscillations could be reproduced and visualised in slow motion. The free software Tracker was used to collect the position data of the massive coiled spring at each instant and compare them with the related solution of the wave equation obtained by Fourier synthesis of the first six terms.
Slow spin dynamics of cluster spin-glass spinel Zn(Fe

1−x

Ru
x
)2O4: role of Jahn–Teller active spin-1/2 Cu2+ ions at B-sites
Authors: Jena Suchit Kumar , Sarkar Tapati , RoyChowdhury Mouli , Weise Bruno , Qi Yajun , Thota Subhash 
Published: July 2022

Abstract
We report the slow spin dynamics of cluster spin-glass (SG) spinel Zn(Fe

1
−
x

Ru
x
)2O4 by means of detailed

d
c

-magnetization and

a
c

-susceptibility studies combined with the heat capacity analysis. Two specific compositions (x = 0.5, 0.75) have been investigated in detail along with the substitution of Jahn–Teller (JT) active spin-1/2 Cu2+ ions at B-sites. Measurements based on the frequency and temperature dependence of

a
c

-susceptibility (

χ

a
c

(
f
,
T
)

) and the subsequent analysis using the empirical scaling laws such as: (a) Vogel–Fulcher law and (b) Power law reveal the presence of cluster SG state below the characteristic freezing temperature

T

S
G

(17.77 K (x = 0.5) and 14 K (x = 0.75)). Relaxation dynamics of both the compositions follow the non-mean field de Almeida–Thouless (AT)-line approach

(

T

S
G

(
H
)
=

T

S
G

(
0
)
(
1
−
A

H

2

/

ϕ

)
)

, with an ideal value of φ = 3. Nevertheless, the analysis of temperature dependent high field

d
c

-susceptibility,

χ

h
f

(

2
kOe

⩽

H

DC

⩽

20
kOe

, T) provides evidence for Gabay–Toulouse type mixed-phase (coexistence of SG and ferrimagnetic (FiM)) behaviour. Further, in the case of Cu0.2Zn0.8FeRuO4 system, slowly fluctuating magnetic clusters persist even above the short-range FiM ordering temperature (

T

F
i
M

) and their volume fraction vanishes completely across ∼6

T

F
i
M

. This particular feature of the dynamics has been very well supported by the time decay of the thermoremanent magnetization and heat-capacity studies. We employed the high temperature series expansion technique to determine the symmetric exchange coupling (

J

S

) between the spins which yields

J

S

=
−
3.02
×

10

−
5

eV for Cu0.2Zn0.8FeRuO4 representing the dominant intra-sublattice ferromagnetic interactions due to the dilute incorporation of the JT active Cu2+ ions. However, the antiferromagnetic coupling is predominant in ZnFeRuO4 and Cu0.2Zn0.8Fe0.5Ru1.5O4 systems. Finally, we deduced the magnetic phase diagram in the

H

D
C

−
T

plane using the characteristic parameters obtained from the field variations of both

a
c

- and

d
c

-magnetization measurements.
Control of spoke movement in DCMS plasmas
Authors: George M , Breilmann W , Held J , von Keudell A 
Published: July 2022

Abstract
Spokes appear as zones of increased ionisation in magnetron sputtering discharges. They rotate in front of a 2″ target at a natural frequency between a few 10 kHz and several 100 kHz and move in

E

→

×

B

→

or anti

E

→

×

B

→

direction depending on plasma power. Spokes are known to cause strong gradients in plasma density and potential and can, thus, increase the ion transport from target to substrate. Here, we explore the possibility to control spokes by applying a given frequency f to a set of control probes around the plasma to lock the spoke movement. The efficiency of this locking is analyzed by diagnostic probes and energy resolved mass spectrometry, which measure the integrated ion fluxes leaving the magnetic trap region. It was found that the spoke movement could be locked to the external control signal at frequency f around the natural spoke frequencies f
0. The additional control signal affects the ion flux twofold: (i) a 15% increase in ion flux towards the substrate and a 15% reduction in radial direction irrespective of control frequency is observed, which is explained by a change in plasma confinement since electric fluctuations at the separatrix are induced; (ii) the locking at f causes an increase in ion current in normal as well as in radial direction for f < f
0 and a reduction for f > f
0. This is explained by either longer or shorter residence times of ions in the electric fields caused by the spoke, or by an enhancement of these fields caused by the control. Using this spoke controlling technique an overall increase of ion flux towards the substrate of up to 30% was realized.
A thermal tunable terahertz metamaterial absorber based on strontium titanate
Authors: Hou Xin Fu , Li Yao Yao , Wu Xiao Jing , He Guang Yu , Wang Ming Wei 
Published: July 2022

Abstract
At present, the development of metamaterials is abundant. Scientists have developed plenty of metamaterials to meet the rich needs in medicine, military and so on. A temperature sensitive dual-band absorber made of strontium titanate(SrTiO3, STO) with stacked structure is designed, and the absorbance of double modes in the range of 0–0.25 THz exceeds 99%. The absorber is insensitive to polarization and could maintain good absorption efficiency at large angle incidence. As the temperature changes from 200 K to 400 K, the resonant frequency changes significantly, and the modulation depth exceeds 40%. The proposed thermal tunable absorber can be used in radiative heat measurement, biomedical and chemical sensing, photoelectric detection and other fields. It also can be used to make thermal tunable sensors, light modulators, Terahertz absorbers and other novel devices.
Study of lead-free vacancy ordered double perovskites Cs2TeX6 (X = Cl, Br, I) for solar cells, and renewable energy
Authors: Albalawi Hind , Nazir Ghazanfar , Younas Muhammad , Al-Qaisi Samah , Ashiq M G B , Alzahrani Jameelah , Somaily H H , Morsi Manal , Ghrib T 
Published: July 2022

Abstract
Herein, the electronic, optical, mechanical, and transport properties of a double perovskites Cs2TeX6 (X = Cl, Br, I) are explored with the focus on solar cell and thermoelectric applications by the density functional theory (DFT). The feasibility of structural, thermodynamic, and elastic stabilities is arbitrated by a tolerance factor, formation energy, and elastic constant, respectively. Further, the Poisson and Pugh’s ratio display the ductile behavior of studied compounds. From the electronic properties analysis, it is revealed that the bandgap decreases by changing Cl with Br, and I from 2.67 eV to 2.52 eV and 1.73 eV, respectively which in results tune the optical properties from visible to infrared region. The shifting of maximum absorption from visible to infrared region makes them promising materials for solar cell and remote sensing devices. Moreover, various optical parameters including refractive index, reflectivity, and optical loss were also reported. Additionally, the transport characteristics were analyzed by electrical, thermal conductivities, and figure of merit (ZT) versus temperature and chemical potential effect. The ZT increases from Cl to I substitution. At the end, the thermodynamic behavior studied by specific heat capacity, Debye temperature and Hall coefficient was presented. All these characteristics have demonstrated that our studied materials are excellent choice for probing solar cell and renewable energy applications.
Skewing the CMB×LSS: a fast method for bispectrum analysis
Authors: Chakraborty Priyesh , Chen Shu-Fan , Dvorkin Cora 
Published: July 2022

Abstract
Upcoming cosmic microwave background (CMB) lensing measurements and tomographic galaxy surveys are expected to provide us with high-precision data sets in the coming years, thus paving the way for fruitful cross-correlation analyses. In this paper we study the information content of the weighted skew-spectrum, a nearly-optimal estimator of the angular bispectrum amplitude, as a means to extract non-Gaussian information on both bias and cosmological parameters from the bispectra of galaxies cross-correlated with CMB lensing, while gaining significantly on speed.
Our results show that for the combination of the Planck satellite and the Dark Energy Spectroscopic Instrument (DESI), the difference in the constraints on bias and cosmological parameters from the skew-spectrum and the bispectrum is at most 17%.
We further compare and find agreement between our theoretical skew-spectra and those estimated from N-body simulations, for which it is important to include gravitational non-linearities beyond perturbation theory and the post-Born effect for CMB lensing. We define an algorithm to apply the skew-spectrum estimator to the data and, as a preliminary step, we use the skew-spectra to constrain bias parameters and the amplitude of shot noise from the simulations through a Markov chain Monte Carlo likelihood analysis, finding that it may be possible to reach percent-level estimates for the linear bias parameter b
1.
Probing top-quark operators with precision electroweak measurements*
Authors: Liu Yiming , Wang Yuhao , Zhang Cen , Zhang Lei , Gu Jiayin 
Published: July 2022

Abstract
In the standard model effective field theory, operators involving the top quark are generally difficult to probe and can generate sizable loop contributions to electroweak precision observables measured by past and future lepton colliders. Could the high precision of electroweak measurements compensate for loop suppression and provide competitive reaches on these operators? Would the inclusion of these contributions introduce too many additional parameters for a meaningful global electroweak analysis to be performed? In this paper, we perform a detailed phenomenological study to address these two important questions. Focusing on eight dimension-6 operators that generate anomalous couplings between electroweak gauge bosons and third-generation quarks, we calculate their one loop contributions to

processes, both on and off the Z-pole, and the

process. A global analysis is performed with these eight operators and those that contribute to the above processes at tree level using measurements at the LEP, SLC, and several low energy experiments. We find that although current electroweak precision measurements are sensitive to the one-loop effects of top-quark operators, it is difficult to separate them from the operators that contribute at tree level, making a global analysis rather challenging. Under further assumptions (for instance, new physics contributes to only third generation quark operators and the S and T parameters), competitive reaches may be obtained in a global fit. Another important finding of our study is that the two operators that generate the dipole interactions of the bottom quark have a significant impact on the Z-pole measurements and should not be omitted. We also discuss the implications of the recently reported W-boson mass measurement at the CDF for our results. Finally, we estimate the reaches of future lepton colliders in probing top-quark operators with precision electroweak measurements.
Multi-scale Analysis of the Relationships between Solar Activity, CO2 and Global Surface Temperature
Authors: Li Zhen , Chang Lijun , Lou Jiahui , Shen Yi , Yan Haoming 
Published: July 2022

Abstract
To reveal whether the dynamics of solar activity precede those of global temperature, especially in terms of global warming, the relationship between total solar irradiance (TSI), which is treated as a proxy of solar activity, and global surface temperature (GST) is investigated in the frequency domain using wavelet coherence. The results suggest that the effect of TSI on GST is mainly reflected on the characteristic scale around 22 yr, and variations in TSI lead to changes in GST with some delay effect as shown by the phase difference arrows. However, this implicated relationship has been perturbed by excessive CO2 emissions since 1960. Through the combination of co-integration analysis and wavelet coherence, the hidden relationship between TSI and GST has been uncovered without the CO2 effect and the results further indicate that TSI has a positive effect on GST at the characteristic scale around 22 yr with a 3 yr lead.
A Search Technique Based on Deep Learning for Fast Radio Bursts and Initial Results for FRB 20201124A with the NSRT
Authors: Liu Yan-Ling , Li Jian , Liu Zhi-Yong , Chen Mao-Zheng , Yuan Jian-Ping , Wang Na , Yuen Rai , Yan Hao 
Published: July 2022

Abstract
The origin and phenomenology of Fast Radio Bursts (FRBs) remain unknown. Fast and efficient search technology for FRBs is critical for triggering immediate multi-wavelength follow-up and voltage data dump. This paper proposes a dispersed dynamic spectra search (DDSS) pipeline for FRB searching based on deep learning, which performs the search directly from observational raw data, rather than relying on generated FRB candidates from single-pulse search algorithms that are based on de-dispersion. We train our deep learning network model using simulated FRBs as positive and negative samples extracted from the observational data of the Nanshan 26 m radio telescope (NSRT) at Xinjiang Astronomical Observatory. The observational data of PSR J1935+1616 are fed into the pipeline to verify the validity and performance of the pipeline. Results of the experiment show that our pipeline can efficiently search single-pulse events with a precision above 99.6%, which satisfies the desired precision for selective voltage data dump. In March 2022, we successfully detected the FRBs emanating from the repeating case of FRB 20201124A with the DDSS pipeline in L-band observations using the NSRT. The DDSS pipeline shows excellent sensitivity in identifying weak single pulses, and its high precision greatly reduces the need for manual review.
Electron mobility anisotropy in (Al,Ga)Sb/InAs two-dimensional electron gases epitaxied on GaAs (001) substrates
Authors: Wei Qiqi , Wang Hailong , Zhao Xupeng , Zhao Jianhua 
Published: July 2022

Abstract
The electron mobility anisotropy in (Al,Ga)Sb/InAs two-dimensional electron gases with different surface morphology has been investigated. Large electron mobility anisotropy is found for the sample with anisotropic morphology, which is mainly induced by the threading dislocations in the InAs layer. For the samples with isotropic morphology, the electron mobility is also anisotropic and could be attributed to the piezoelectric scattering. At low temperature (below transition temperature), the piezoelectric scattering is enhanced with the increase of temperature, leading to the increase of electron mobility anisotropy. At high temperature (above transition temperature), the phonon scattering becomes dominant. Because the phonon scattering is isotropic, the electron mobility anisotropy in all the samples would be reduced. Our results provide useful information for the comprehensive understanding of electron mobility anisotropy in the (Al,Ga)Sb/InAs system.
New insights on divertor parallel flows,E × B drifts, and fluctuations from in situ, two-dimensional probe measurement in the Tokamak à Configuration Variable
Authors: De Oliveira H. , Theiler C. , Février O. , Reimerdes H. , Duval B.P. , Tsui C.K. , Gorno S. , Oliveira D.S. , Perek A. , the TCV Team  
Published: July 2022

Abstract

In situ, two-dimensional (2D) Langmuir probe measurements across a large part of the TCV outer divertor are reported in L-mode discharges with and without divertor baffles. This provides detailed insights into time averaged profiles, particle fluxes, and fluctuation behavior in different divertor regimes. The presence of the baffles is shown to substantially increase the divertor neutral pressure for a given upstream density and to facilitate the access to detachment, an effect that increases with plasma current. The detailed, 2D probe measurements allow for a divertor particle balance, including ion flux contributions from parallel flows and E × B drifts. The poloidal flux contribution from the latter is often comparable or even larger than the former, and the divertor parallel flow direction reverses in some conditions, pointing away from the target. In most conditions, the integrated particle flux at the outer target can be predominantly ascribed to ionization along the outer divertor leg, consistent with a closed-box approximation of the divertor. The exception is a strongly detached divertor, achieved here only with baffles, where the total poloidal ion flux even decreases towards the outer target, indicative of significant plasma recombination. The most striking observation from relative density fluctuation measurements along the outer divertor leg is the transition from poloidally uniform fluctuation levels in attached conditions to fluctuations strongly peaking near the X-point when approaching detachment.
Development of Landsat-8 ARD Products for User Service in Indonesia
Authors: Muchsin F , Ulfa K , Pradono KA , Hendayani  , Dianovita  , Veronica KW 
Published: July 2022

Abstract
Along with the times and technology development, the number of satellite images produced is increasing and diverse, both in terms of spatial and temporal resolution. In addition, in the last few years, LAPAN has done a mosaic of Landsat data for 16 days. The availability of extensive satellite data makes users desire data ready to use without initial processing to save time and costs. Furthermore, the medium resolution image has a comprehensive enough coverage for applications in the forestry, agriculture, plantation, and marine sectors. Therefore, the need for medium resolution Analysis Ready Data (ARD) increases. The available ARD data has been through the initial processing, including ToA and BRDF corrections. The existing Landsat-8 ARD does not cover Indonesian territory. The Landsat-8 ARD for the Indonesian region was first produced and introduced in this paper. Moreover, the development of ARD data quality is carried out by adding a topographic correction process, and image cropping become tiles with a size of 1-degree x 1-degree, which can be run automatically. This processing system produces ARD Landsat-8 to meet user requirements effectively and efficiently. These advantages are obtained because the pre-processing data load for the user has been reduced, and the user can immediately use the data according to the required scope. The software for making ARD Landsat-8 has been recognized as Intellectual Property Rights. Moreover, ARD Landsat-8 for Indonesian territory has been continuously utilized by the Indonesian Ministry of Environment and Forestry and the Indonesian Ministry of Agriculture.
Tectonic Setting of Mount Agung, Bali: Insight From Petrology and Geochemistry Analysis
Authors: Syafitri A , Sucipta I G B E , Arifa A N , Saepuloh A , Widiyantoro S 
Published: July 2022

Abstract
One of the longest arcs in the world originated from the complexity of subduction zones is the Sunda Arc that covers 80% of Indonesia's active volcanoes, from the Andaman, Sumatra, Java, and the Lesser Sunda Islands. Previous research in magmatism in Sunda Arc has conceded that the continental crust is in the west and becomes progressively oceanic towards the east. However, recent research has suggested that continental basement is more widespread than previously thought. Therefore, this study aims to re-evaluate the tectonic setting of Mount Agung, Bali, part of the Lesser Sunda Islands. Based on the results of published geochemistry data analysis and our petrological and/or mineralogical data, we found that Mount Agung was influenced by three cogenetic magmas and can be divided into 4 eruption periods, i.e., pre- 3200±60 BP, 3200±60 – 1870±40 BP, 1870±40 – 1040±50 BP, and post-1040±50 BP. These calc-alkaline magmas were derived from partial melting caused by the subduction of the Indo-Australian Plate within the Eurasian Plate. It produced basalt to dacite rocks with SiO2 varying between 51 and 63 wt%. As seen from the spider diagram, Rb, Ba, Th, K, and La – Sm contents are enriched, while Eu – Lu experienced depletion. In addition, the Nb content shows a negative anomaly, which is a characteristic of volcanic products from convergent plate boundaries. Based on the ratio of Zr to Zr/Y, it introduces that Mount Agung is affected by continental arcs. La/Sm to Th/Nb diagram reveals that in the older period (pre-1040±50 BP), the magma differentiation process is subduction-related enrichment, while in the younger period (post-1040±50 BP), there may be a slight influence from the presence of crustal contamination. Thus, these analyses presume that Bali Island has a continental basement (micro-continent basement), which may become the eastern end boundary of Sundaland.
Understanding the Oceanography Condition in Java Sea using Hydrodynamic Simulation for Patimban Port Development
Authors: Isnaeni Kholillah Y. , Diastomo Hanif , Nusantara Candidad A. D. S. , Windupranata Wiwin 
Published: July 2022

Abstract
This study's purpose is to gain knowledge and information on the hydrodynamic condition in the Java Sea, North Subang Region. The data was compiled from ECMWF for wind data and TMD for tide constituent data as a hydrodynamic model generator and the field data taken from a field survey in 2020 and 4 tide station BIG (Jakarta (3) and Cirebon (1)). The software developed by Deltares (DELFT3D) was used for hydrodynamic simulation to simulate hydrodynamic conditions (water level and current). A structured rectangular grid was used to construct domain boundary model on the north coast of West Java Province. The bathymetry data from BATNAS (BIG) has been processed to produce a 100 m resolution to accommodate the high-resolution bathymetry data in the coastal areas, especially in Patimban Port. The result shows the water level fluctuation and current movement on the north coast of the West Java Sea during 2020. The model verification shows that the tidal phase already has a similar pattern, especially on the western side of the West Java Sea. RMSE values for stations in Jakarta Sea are 0.2, 0.04, 0.21, and 0.39 with coefficient correlation are 0.94, 0.91, 0.93, and 0.69 for Pondok Dayung, Sunda Kelapa, Kolinamil, and Cirebon respectively. The monsoon seasonal phenomena affected the current condition in the study area. However, the tidal model amplitude needs to be tuned in, so that it can fit with the field data. The study of the hydrodynamic condition is necessary for Patimban Port development which is currently under construction.