bluuebunny/crossref_metadata_2025_split huggingface dataset:
A comparative investigation of the effects of temperature on the oxidation resistance of high-velocity oxy-fuel coating on AISI316L
Authors: Kumar Naveen , Alam Md Sarfaraz , Mishra Vishwesh , Vasudev Hitesh , Yadav Prabhat Chand , Choubey Vikas Kumar 
Published: April 2024

Abstract
This paper examines the 50 cycles of the oxidation characteristics of WC-10Co-4Cr feedstock powder coatings applied by HVOF on AISI316L at three different temperatures: 750 °C, 850 °C, and 950 °C. The oxidation kinetics were established, and the results for the bare and coated specimens were compared using the weight change measurements of the coated samples. The surface morphology of the coated austenite steel samples was examined using x-ray diffraction (XRD), scanning electron microscopy, and EDS after the oxidation cycle. Severe peeling-off, sputtering, and spalling from the oxide scale were seen in the AISI 316 L steel that was not coated. In addition, the scale was rich in Fe2O3, which contributed to the significant weight gain. The protective WO3 and Cr2O3 phases formed on the oxide scale were revealed to have more excellent oxidation resistance.
Investigation of HTL-free perovskite solar cell under LED illumination: interplay between energy bandgap and absorber optimization
Authors: Alanazi Tarek I , Zein Walid , Azab Karim , Shaker Ahmed , Salah Mostafa M , Selim Dalia 
Published: April 2024

Abstract
In this paper, we introduce an efficient perovskite solar cell (PSC) designed for indoor applications, which does not incorporate a hole transport layer (HTL). The perovskite material studied in this work is MAPbI3-xClx, whose bandgap energy can be adjusted to match the spectrum of white LEDs. While the removal of the HTL initially leads to a decline in cell performance, a subsequent enhancement is achieved in performance when the work function of the rear contact is increased. This improvement can be attributed to the increased electric field at the back contact interface. The performance of the HTL-free PSC is further optimized by adjusting various technological and physical factors of the perovskite absorber. These parameters include thickness, bulk defects, doping level, and energy gap of the perovskite material. Our results demonstrate that the HTL-free PSC structure exhibits superior performance metrics under a white LED environment at 1000 lux and a color temperature of 2700 K. In this context, a power conversion efficiency (PCE) above 34% can be obtained upon proper optimization procedures. Further, the interplay between the energy gap (E

g
) of the absorber and the optimization procedures is investigated, highlighting its importance in the context of HTL-free designs for indoor applications. Practical recommendations stemming from this study include an emphasis on optimization for HTL-free cells and caution against applying ideal E

g
ranges to non-optimized configurations.
Control of spin on ferromagnetism and thermoelectric properties of Sr(V/Cr)2S4; emergent spintronic aspirant
Authors: Nazir Ghazanfar , Mahmood Q , Zelai Taharh , Rehman Adeela , Albalawi Hind , Kattan Nessrin A , Bouzgarrou S , Boukhris Imed 
Published: April 2024

Abstract
Strontium-based spinel chalcogenides are promising materials for energy harvesting and spintronics. Therefore, the electronic, ferromagnetic, and thermoelectric properties of SrZ2S4 (Z = V, Cr) spinels are thoroughly investigated. The formation energy and energy released during optimization demonstrate the stability of the cubic phase in a ferromagnetic state. The spin polarisation and the Curie temperature have been calculated using the density of states (DOSs) and the Heisenberg model. To explore ferromagnetism, exchange energies, the double exchange mechanism, exchange constants, and the hybridization process have all been used. The decrease in the magnetic moment for V/Cr and its shift to nonmagnetic (Sr, S) sites show that ferromagnetism is caused by electron exchange rather than V/Cr atom clustering. In the end, electrical and thermal conductivities, Seeback coefficient (S), and power factor have been used to explain the thermoelectric analysis for energy applications. Ultralow thermal conductivity values lessen the impact of heat on electron spin, extending the device’s useful life. All of these aspects, when taken together, provide a comprehensive picture of the role electron exchange plays in ferromagnetism and its application in energy devices.
Study of traveling soliton and fronts phenomena in fractional Kolmogorov-Petrovskii-Piskunov equation
Authors: Ullah Ikram , Shah Kamal , Abdeljawad Thabet 
Published: April 2024

Abstract
The present research work presents the modified Extended Direct Algebraic Method (m-EDAM) to construct and analyze propagating soliton solutions for fractional Kolmogorov-Petrovskii-Piskunov equation (FKPPE) which incorporates Caputo’s fractional derivatives. The FKPPE has significance in various disciplines such as population growth, reaction-diffusion mechanisms, and mathematical biology. By leveraging the series form solution, the proposed m-EDAM determines plethora of travelling soliton solutions through the transformation of FKPPE into Nonlinear Ordinary Differential equation (NODE). These soliton solutions shed light on propagation processes in the framework of the FKPPE model. Our study also offers some graphical representations that facilitate the characterization and investigation of propagation processes of the obtained soliton solutions which include kink, shock soliton solutions. Our work advances our understanding of complicated phenomena across multiple academic disciplines by fusing insights from mathematical biology and reaction-diffusion mechanisms.
Dynamics of the atom-polyatomic molecule conversion with quantum decoherence
Authors: Yang Chenglong , Zhang Qi , Cui Bo 
Published: April 2024

Abstract
Based on the mean-field approximation and the two-mode Bose–Hubbard model, we investigate the dynamical properties of atom-polyatomic molecule conversion systems under dissipation and dephasing. For such a many-body system problem, we partition phase space based on the states of fixed points, study the movement of fixed points and the transition to attractors in an open system. Additionally, for all the atoms that constitute a molecule, depending on whether the species of these atoms are identical or not, we introduce the innovative concepts of unbiased and biased systems. We discover that in biased conversion systems under particle losses, the evolution trajectories are distributed on a three-dimensional Bloch sphere with an internal structure. There exists a significant difference from the two-dimensional Hilbert space of an unbiased system. Finally, we discuss the sweeping rate of the time-varying magnetic field applied externally to the conversion system, and analyze a feasible scheme for the quantum coherent synthesis of triatomic molecules.
Turbulent spot formation in three-dimensional yukawa liquids using large-scale molecular dynamics simulation—effect of system size
Authors: Kalita Suruj , Ganesh Rajaraman 
Published: April 2024

Abstract
We have performed classical ‘first principles’ 3D Molecular Dynamics (MD) simulation of plane-Couette flow (PCF) in a 3D Yukawa liquid. The main aim of the present investigation is to study the effect of stream-wise (flow-direction) and span-wise (transverse direction to the flow) width on the subcritical transition to turbulence in plane Couette flow (PCF), separately. In the past, taking very large-aspect ratio systems, subcritical transition to turbulence in PCF has been studied in great detail. However, the effect of stream-wise and span-wise width on the turbulent dynamics separately, have not been studied in detail. In the present work, we have investigated the effect of stream-wise and span-wise width or length and found that the stream-wise length enhances the large-scale energy, which gives rise to strong large-scale flow, and span-wise width enhances the small-scale energy, which gives rise to strong small-scale structures. In other words, topology of the turbulent spot is observed to change with the change in system size. The spectral separation between the modes governing the large and small-scale dynamics improves with the increase in system sizes. The connection between the stream-wise vortices and the stream-wise velocity streaks is investigated in details. We have found that the number stream-wise velocity streaks is one unit larger than the number of stream-wise vortices. A qualitative comparison between the results obtained from the MD simulation and the hydrodynamics experiment is presented in this article. The behavior of the system was observed to vary with the range of interactions among the dust grains.
Searching for Exploding black holes
Authors: Boluna Xavier , Profumo Stefano , Blé Juliette , Hennings Dana 
Published: April 2024

Abstract
The observation of the final stages of the evaporation of a light black hole, which
Hawking referred to as “black hole explosion”, would offer critical insights on quantum gravity
and high-energy physics phenomena. Here, we explore, review, and revisit the observational
features and rates expected for nearby, light, evaporating black holes, and we assess and compare
the expected sensitivity of a broad range of observatories. We then focus on the search for
candidate black hole explosions in archival data from the Fermi Large Area Telescope and Gamma-ray
Burst Monitor, and outline possible future observational campaigns.
Semiclassical approach to spin dynamics of a ferromagnetic S = 1 chain
Authors: Li 李 Chengchen 承晨 , Cui 崔 Yi 祎 , Yu 于 Weiqiang 伟强 , Yu 俞 Rong 榕 
Published: April 2024

Abstract
Motivated by recent experimental progress on the quasi-one-dimensional quantum magnet NiNb2O6, we study the spin dynamics of an S = 1 ferromagnetic Heisenberg chain with single-ion anisotropy by using a semiclassical molecular dynamics approach. This system undergoes a quantum phase transition from a ferromagnetic to a paramagnetic state under a transverse magnetic field, and the magnetic response reflecting this transition is well described by our semiclassical method. We show that at low temperature the transverse component of the dynamical structure factor depicts clearly the magnon dispersion, and the longitudinal component exhibits two continua associated with single- and two-magnon excitations, respectively. These spin excitation spectra show interesting temperature dependence as effects of magnon interactions. Our findings shed light on the experimental detection of spin excitations in a large class of quasi-one-dimensional magnets.
Neutrino oscillations in the Non-Kerr black hole with quantum phenomenon*
Authors: Alibekov Husan , Atamurotov Farruh , Abdujabbarov Ahmadjon , Khamidov Vokhid 
Published: April 2024

Abstract
In this study, we have investigated the mathematical components of the Dirac equation in curved spacetime and how they can be applied to the analysis of neutrino oscillations. More specifically, we have developed a method for calculating the phase shift in flavor neutrino oscillations by utilizing a Taylor series expansion of the action that takes into account

orders. In addition, we have used this method to assess how the phase difference in neutrino mass eigenstates changes according to the gravitational field described by the Johannsen spacetime.
Production of higher excited quarkonium pair at the super Z factory*
Authors: Liao 廖 Qi-Li 其力 , Jiang 蒋 Jun 军 
Published: April 2024

Abstract
The heavy constituent quark pair of the heavy quarkonium is produced perturbatively and subsequently undergoes hadronization into the bound state non-perturbatively. The production of the heavy quarkonium is essential to testing our understanding of quantum chromodynamics (QCD) in both perturbative and non-perturbative aspects. The electron-positron collider will provide a suitable platform for the precise study of the heavy quarkonium. The higher excited heavy quarkonium may contribute significantly to the ground states, which should be considered for sound estimation. We study the production rates of the higher excited states quarkonium pair in

(

- or b-quarks) at the future Z factory under the non-relativistic QCD (NRQCD) framework, where the

/

represents the color-singlet states

, and

(

). The differential angle distribution of cross sections

is given. We also discuss the uncertainties of cross sections caused by the varying quark masses and the renormalization scale μ. We show that significant numbers of events for pairs of higher excited state quarkonia can be generated at the super Z factory.
Inelastic Scattering of Dark Matter with Heavy Cosmic Rays
Authors: Lu Keyu , Tsai Yue-Lin Sming , Yuan Qiang , Zhang Le 
Published: April 2024

Abstract
We investigate the impact of inelastic collisions between dark matter (DM) and heavy cosmic ray (CR) nuclei on CR propagation. We approximate the fragmentation cross-sections for DM-CR collisions using collider-measured proton-nuclei scattering cross-sections, allowing us to assess how these collisions affect the spectra of CR boron and carbon. We derive new CR spectra from DM-CR collisions by incorporating their cross-sections into the source terms and solving the diffusion equation for the complete network of reactions involved in generating secondary species. In a specific example with a coupling strength of b

χ
= 0.1 and a DM mass of m

χ
= 0.1 GeV, considering a simplified scenario where DM interacts exclusively with oxygen, a notable modification in the boron-to-carbon spectrum due to the DM-CR interaction is observed. Particularly, the peak within the spectrum, spanning from 0.1 to 10 GeV, experiences an enhancement of approximately 1.5 times. However, in a more realistic scenario where DM particles interact with all CRs, this peak can be amplified to twice its original value. Utilizing the latest data from AMS-02 and DAMPE on the boron-to-carbon ratio, we estimate a 95% upper limit for the effective inelastic cross-section of DM-proton as a function of DM mass. Our findings reveal that at m

χ
≃ 2 MeV, the effective inelastic cross-section between DM and protons must be less than

O
(

10

−
32

)

cm

2

.
Orthogonal extended infomax algorithm
Authors: Ille Nicole 
Published: April 2024

Abstract

Objective. The extended infomax algorithm for independent component analysis (ICA) can separate sub- and super-Gaussian signals but converges slowly as it uses stochastic gradient optimization. In this paper, an improved extended infomax algorithm is presented that converges much faster. Approach. Accelerated convergence is achieved by replacing the natural gradient learning rule of extended infomax by a fully-multiplicative orthogonal-group based update scheme of the ICA unmixing matrix, leading to an orthogonal extended infomax algorithm (OgExtInf). The computational performance of OgExtInf was compared with original extended infomax and with two fast ICA algorithms: the popular FastICA and Picard, a preconditioned limited-memory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) algorithm belonging to the family of quasi-Newton methods. Main results. OgExtInf converges much faster than original extended infomax. For small-size electroencephalogram (EEG) data segments, as used for example in online EEG processing, OgExtInf is also faster than FastICA and Picard. Significance. OgExtInf may be useful for fast and reliable ICA, e.g. in online systems for epileptic spike and seizure detection or brain-computer interfaces.
Dielectrophoretic force characteristics toward Lactobacillus casei on an oblique-patterned electrode
Authors: Khazanna  , Fitriyani S , Safitri R , Lahna K , Yusibani E , Irwansyah  , Iswardy E 
Published: April 2024

Abstract
Dielectrophoresis-based biochips with various microelectrode configurations have been extensively studied within the last five deca des. However, wide-field application is still challenging. This study aims to fabricate an oblique-configuration microelectrode and then utilizes it to determine the dielectrophoretic (DEP) characteristics of Lactobacillus casei based on the generated non-uniform electric field. The electric field distribution on microelectrodes was simulated with Quickfield 6.6 student version. The microelectrodes were fabricated using a copper film on a glass substrate. The DEP characteristic of Lactobacillus casei was investigated by applying a sinusoidal AC signal to microelectrodes in medium solution with an electrical conductivity of 0.05 S/m. The electric-field simulations show that the strongest electric-field was generated on the tip of electrodes spacing, and the weakest electric-field was generated on the inner of electrodes spacing. The negative-DEP force on Lactobacillus casei was observed at the frequency of 60–130 kHz, while the positive-DEP force was observed at the frequency of 380–700 kHz, both at voltage of 2–6 Vpp. The nDEP force led Lactobacillus casei to be pushed toward the weak electric field on the inner of electrodes spacing, and the pDEP force induced Lactobacillus casei to be attracted toward the strong electric-field on the tip of electrodes spacing. This study implies that the proposed oblique-microelectrode platform has promising application for bioparticles separation.
Identification of shale gas existence based on 2-dimensional magnetotelluric data in the Kutai basin, East Kalimantan, Indonesia
Authors: Putri S N , Hawan S I , Hapsoro C A , Laksono Y A 
Published: April 2024

Abstract
Research on unconventional methods in the shale gas exploration process has begun to be developed to meet the demand for oil and natural gas sustainability. The research area is located in the Kutai Basin, East Kalimantan, Indonesia. The current study from the Geological Survey Center shows that the Kutai Basin has 46.79 TCF of shale gas potential. The magnetotelluric (MT) method was applied in this study to describe the distribution of subsurface resistivity values. The inversion schemes performed in the MT method are 1-dimensional and 2-dimensional inversions. In this study, there are 8 measurement stations in one line. The presence of low resistivity values or conductive zones identifies the potential for black shale layers. The potential for shale gas is suspected to be detected at station KT29, which is included in the Pamaluan Formation, and at stations KT12, KT31, KT13, and KT15, which are included in the Pulaubalang Formation, because it is associated with source rock from petroleum in the Kutai Basin system, as supported by previous research data.
Sanding phenomena vulnerability observations due to CO2 injection at the Air Benakat reservoir in South Sumatera
Authors: Aziz Prasandi Abdul , Marhaendrajana Taufan , Siagian Utjok W. R. 
Published: April 2024

Abstract
Carbon sequestration using carbon capture storage (CCS) is one of the most important operational activities in the oil and gas industry to reduce greenhouse gas emissions and increase hydrocarbon production. Carbon Capture Utilization & Storage (CCUS) can be utilized for both enhancing oil recovery (CO2-EOR), as well as gas recovery (CO2-EGR) by injecting CO2 into the reservoir. However, the CO2 injection into reservoir rock can raise potential sanding problems in both injection and production wells. The phenomena of sanding may be induced dominantly due to carbonic acid injection in the reservoir. The reaction between CO2 and water will form carbonic acid in the reservoir, which can cause the dissolution of rock minerals, especially carbonate cementation (such as calcite and dolomite). We have investigated the sanding effect when CO2 was injected into the reservoir using several laboratory-scale measurements and observations on the Air Benakat reservoir sample in South Sumatera. The sanding vulnerability was measured by observing pore structure, changes in elastic properties, and rock strength through Rock Physics and Rock Mechanics measurements. XRD analysis showed the presence of CaMg(CO3)2 (dolomite) minerals in the Air Benakat sandstone sample, which resulted in the possibility of a chemical reaction of the sample, either matrix or pores. The pore structure dissolution was detected from microscale images when the rock was injected with CO2 dissolved in brine water. The changes in rock’s pores due to the dissolution process were also clearly observed from measurements of the changes in rock mass during the injection process of carbonic acid fluid into rock samples from time-to-time measurement.
Microstructure and Electrochemical Performance of Supercapacitor Based on Nickel/Activated Carbon Composite Electrode
Authors: Diantoro M , Rahmadani H , Nasikhudin  , Maharani T 
Published: April 2024

Abstract
Supercapacitors are promising electrochemical energy storage devices because they have higher energy than conventional capacitors and higher power than rechargeable batteries. Based on material for supercapacitors, activated Carbon (AC) has large specific surface area, high conductivity, and chemical stability, but still shows less than optimal specific capacitance and energy density. In this work, AC was composited with nickel (Ni) and Carbon Black (CB) to modify microstructure and optimize its electrochemical performance. Initially, synthesis of Ni-AC (cathode) and AC (anode) slurry was carried out by blending method in different mass percentages of Ni (5, 10, 15, 20, 25 %). The slurry was coated using doctor blade on aluminum foil. Then, Ni-AC//AC was fabricated and tested by Galvanostatic Charge-Discharge (GCD) instrument to analyze the electrochemical performance changes of supercapacitor. Based on XRD pattern, AC peak was found at 26.5° and Ni-AC composite had additional peaks in 44.4°, 51.7°, and 76.2°. The crystal size and porosity of electrode were in range of 23.2 – 45.4 nm and 66.6 – 75.7%, respectively. Based on the electrochemical evaluation, addition of 20% Ni mass in activated carbon electrode has the optimum performance, which increases active sites of the electrode and ion electrolyte adsorption capacity. Further, the GCD revealed that the prepared Ni-AC//AC electrode have excellent capacitive behavior with specific capacitance of 56.6 F/g, power density of 308.8 W/kg, energy density of 20.8 Wh/kg, and specific retention of 69.6% until 50 cycles.