bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative analysis of surface roughness level for bearing coating using VMD of vibration signal
Authors: Cambow Rameshwar , Singh Manpreet 
Published: July 2024

Abstract
Degradation in surface finish of the material is an important concern in engineering applications. However, most of the conventional techniques available to monitor the surface roughness requires dismantling of the machine element. Though in rotary components like bearing, it is practically not feasible. Therefore, in this work, an on-board technique is proposed to compare the level of surface roughness based on vibration signature. To demonstrate, five different industrial standard coatings (Nickel, Copper, Zinc phosphate (ZnP), Silver, and Black oxide) were carried out on raw five ball bearings (NBC6205). Two sets of coated bearing were prepared, where first set was utilised for experimentation and second for the purpose of measuring surface roughness of bearing surface. These coated bearings were tested at five different RPMs ranging from 300 RPM to 1500 RPM and their vibration signals were recorded. The recorded vibration signals must be having characteristics originated from ball rolling on different level of surface roughness and hence distributed in nature. Further, to target distributed characteristics present in the signal, commonly used statistical parameters for vibration signature analysis (RMS, Crest factor, Variance, Skewness, Kurtosis, Shannon entropy and Log energy) were calculated. Then, correlation of the parameters was checked in relation to the different levels of surface roughness but no relation was found. The signals were then decomposed into six intrinsic mode functions (IMFs) using Variational Mode Decomposition (VMD) method. Again, same statistical parameters were calculated for these decomposed levels, it has been noted that Shannon entropy have shown correlation to surface roughness in at least one decomposed level between 900 to 1500 RPM with minimum value of chain index as 176.65. Moreover, in this RPM range, responsive frequency bands found to be shifted towards higher side i.e. from 567 to 4590 Hz.
Design and performance analysis of double gate vertically stacked MoS2 nanosheet field effect transistor
Authors: Rudravaram Srikanth , Shukla Rajendra P , Satish Maheshwaram 
Published: July 2024

Abstract
In this work we report a vertically stacked nanosheet Field Effect Transistor (NSFET) in double gate configuration using transition metal dichalcogenide (TMD) based molybdenum disulphide (MoS2) as the conducting channel. The performance of the NSFET is analysed for number of channels, different channel thickness, different source/drain contacts. The performance of the device at different temperatures (T) also analysed. The proposed NSFET with three vertically stacked channels, exhibits a ON current (ION) of 30.6 μA μm−1, Subthreshold swing (SS) of 69 mV/dec and ON to OFF current ratio of more than 108 at Vds = 1V. Further the ION can be improved with multi-layer channel thickness. The performance of the vertically stacked MoS2 NSFET in junction less (JL) and inversion mode (IM) is compared, it is concluded from the simulations that JL vertically stacked MoS2 NSFET more immune to short channel effects such as threshold voltage (Vth) roll-off and drain induced barrier lowering (DIBL).
Laser driven wake wave in pair-ion electron plasma with inclusion of ion dynamics
Authors: Bhardwaj Priyank , Karmakar Mithun , Saini L K 
Published: July 2024

Abstract
The generation of laser driven plasma wake wave has been investigated in hydrogen pair-ion electron plasma. The consideration of dynamics of the positive and negative ion pair have been adopted. Inclusion of the ion motion has the effect of modifying the electric field and density profiles of the wake wave. This has been demonstrated by observing the variation of the electron density and electric field profiles with the change in positive ion/negative ion concentration. High density spikes and sawtooth like electric field profiles (indication of wave breaking) are observed to transform into sinusoidal electric field profile and low amplitude density profile when the positive ion density in the plasma system is kept higher. Furthermore, we observe the variation of the electric field amplitude of the wake wave with the laser pulse width. This feature is the indication of the possibility of hybrid acceleration (Direct Laser Acceleration and wake field acceleration) of accelerated beam. The results are quite relevant in laser plasma interaction field in experimental physics and also in planetary environment.
Bifurcation analysis with chaotic attractor for a special case of jerk system
Authors: Rasul Tahsin I , Salih Rizgar H 
Published: July 2024

Abstract
This article focuses on investigating local bifurcations in a special type of chaotic jerk system. It examines the occurrence and non-occurrence of saddle-node, transcritical, zero-Hopf, Hopf, and pitchfork bifurcations at the origin. The parameters that result in a zero-Hopf equilibrium point at the origin are characterized for the proposed system. Additionally, a demonstration is provided to show that the utilization of the first-order averaging theory leads to the emergence of a single periodic solution branching out from the zero-Hopf equilibrium located at the origin. Furthermore, the focus quantities method is applied to explore the periodicity of the cubic part of the system. This method helps determine the number of periodic solutions that can emerge from the Hopf point. Due to the computational load for computing singular quantities, only three singular quantities are found. Under specific conditions, it is shown that three periodic solutions can bifurcate from the origin of the system. Finally, the study also examines the chaotic attractors of the system.
Novel exact traveling wave solutions of Newton-Schrödinger system using Nucci reduction and Sardar sub-equation methods
Authors: Chahlaoui Younes , Butt Asma Rashid , Abbas Hafsa , Bekir Ahmet 
Published: July 2024

Abstract
The main theme of this piece of research is to tackle a coupled Newton-Schrödinger type model. Two analytical techniques namely, Nucci reduction method and Sardar sub-equation methods have been employed to scrutinize exact traveling wave solutions. Through the application of these approaches, various solitary and traveling wave solutions including bright, dark and singular periodic solitons, have been obtained. Further, we have not only discussed the physical depiction of specific solutions but have also visually presented them through two dimensional (2D), three dimensional (3D), and density plots utilizing relevant parameter values. The extracted solutions show that the proposed methods are effective, simple, and successful in pinpointing the exact solution of models in engineering, optics, and other nonlinear disciplines.
Linear and nonlinear exciton polariton dispersion in MoS2 nanosheets and its nickel doping dependence
Authors: Kaddour Sondes , Mastour Nouha , Zaimia Randa , Ridene Said , Raouafi Noureddine 
Published: July 2024

Abstract
In this paper, we study the influence of Ni-doping on A- and B-exciton polariton dispersion in MoS2 nanosheets. In particular, we have calculated the effect of the Ni-concentration on the energy dispersion and therefore we have deduced the effective masses by adjusting the hopping parameter. The E

A
, E

B
-exciton transition energies and the hopping parameter are discerned from the PL of Ni-MoS2 nanosheets. It is shown that the Ni changes considerably the bandgap and as a result the electronic band structure, the effective masses, the optical transition, and the hopping term. We found that the increasing concentration of Ni-dopant can modulate and favors the mixture of A- and B-exciton peaks of MoS2 nanosheets. The diverging Ni-concentration of A- and B-exciton polariton dispersion are also discerned and discussed. Finaly, we can predict that these changes caused by the influence of Ni-doping can be used in most applications involving exciton polariton dispersion for photonics and optoelectronics devices.
Observability of CMB spectrum distortions from dark matter annihilation
Authors: Li Shao-Ping 
Published: July 2024

Abstract
Even after dark matter chemically freezes out in the early universe, electromagnetic cascades from dark matter annihilation can still perturb the background photon spectrum when the universe temperature cools down to 0.5 keV. We revisit the CMB spectrum distortions caused by s-wave dark matter annihilation under the updated Planck data and the future CMB sensitivity, concluding that s-wave annihilation cannot create observable distortions under forecast sensitivities of the (Super-)PIXIE missions. We further detail the case of p-wave dark matter annihilation, demonstrating the observability of the primordial μ-distortion. Taking current constraints from primordial light elements, structure formations, cosmic electron-positron rays, and gamma rays, we find that the μ-distortion reaching the observational limit as large as μ ≃ 3 × 10-8 can only be realized with a dark matter mass at 10–50 MeV and a kinetic decoupling temperature around 1 keV. The upper bound of the p-wave annihilation cross section can be strengthened by an order of magnitude if the μ-distortion is not detected.
Reconstructing the long-wavelength matter density fluctuation modes from the scalar-type clustering fossils
Authors: Wang Zhenyuan , Jeong Donghui 
Published: July 2024

Abstract
Revealing the large-scale structure from the 21cm intensity mapping surveys is only possible after the foreground cleaning. However, most current cleaning techniques relying on the smoothness of the foreground spectrum lead to a severe side effect of removing the large-scale structure signal along the line of sight. On the other hand, the clustering fossil, a coherent variation of the small-scale clustering over large scales, allows us to recover the long-wavelength density modes from the off-diagonal correlation between short-wavelength modes. In this paper, we revisit the reconstruction based on the short-wavelength matter density modes in real space and scrutinize the requirements for an unbiased and optimal clustering-fossil estimator. We show that (A) the estimator is unbiased only when using an accurate bispectrum model for the long-short-short mode coupling and (B) including the connected four-point correlation functions is essential for characterizing the noise power spectrum of the estimated long mode. For matter in real space, the clustering fossil estimator based upon the leading-order bispectrum yields an unbiased estimation of the long-wavelength (k ≲ 0.01 [h/Mpc]) modes with the cross-correlation coefficient of 0.7 at redshifts z = 0 to 3.
Pushing the Limits of the Cosmic Origin Spectrograph (COS) with an Optimized Background Correction
Authors: Hernandez Svea , Igoshev Andrei , Taylor Jo , Sahnow David , Jones Logan 
Published: July 2024

Abstract
Observations utilizing the ultraviolet capabilities of the Cosmic Origin Spectrograph (COS) onboard the Hubble Space Telescope are of unique value to the astronomy community. Spectroscopy down to 900 Å with COS has enabled new science areas. However, contrary to the situation at longer wavelengths, these observations are limited by detector background noise. The background correction currently applied by the standard calibration pipeline (CalCOS) is not optimized for faint targets, limiting the scientific value of low signal-to-noise ratio (S/N) observations. In this work we investigate a possible dependence of the variations of the dark rate in both segments of the COS far-ultraviolet detector on time, detector high voltage (HV), and solar activity. Through our analysis we identified a number of detector states (on a configuration basis, e.g., HV and segment) characterizing the spatial distribution of dark counts, and created superdarks to be used in an optimized two-dimensional (2D) background correction. We have developed and tested Another COS Dark Correction (ACDC), a dedicated pipeline to perform a 2D background correction based on statistical methods, producing background-corrected and flux-calibrated spectra. While our testing of ACDC showed an average improvement in S/N values of ∼10%, in a few cases the improvements in S/N reached 60% across the whole wavelength range of individual segments.
Plasma control for the step prototype power plant
Authors: Lennholm M. , Aleiferis S. , Bakes S. , Bardsley O.P. , van Berkel M. , Casson F.J. , Chaudry F. , Conway N.J. , Hender T.C. , Henderson S.S. , Hudoba A. , Kool B. , Lafferty M. , Meyer H. , Mitchell J. , Mitra A. , Osawa R. , Otin R. , Parrott A. , Thompson T. , Xia G. ,   the STEP Team
Published: July 2024

AbstractIn 2019 the UK launched the Spherical Tokamak for Energy Production (STEP) programme to design and build a prototype electricity producing nuclear fusion power plant, aiming to start operation around 2040. The plant should lay the foundation for the development of commercial nuclear fusion power plants. The design is based on the spherical tokamak principle, which opens a route to high pressure, steady state, operation. While facilitating steady state operation, the spherical design introduces some specific plasma control challenges: (i) All plasma current during the burn phase should to be generated through non-inductive means, dominated by bootstrap current. This leads to operation at high normalised plasma pressureβNwith high plasma elongation, which in turn imposes effective active stabilisation of the vertical plasma position. (ii) The tight aspect ratio means very limited space for a central solenoid, imposing that even the current ramp up must be non-inductively generated. (iii) The compact design leads to extreme heat loads on plasma facing components. A double null design has been chosen to spread this load, putting strict demands on the control of the unstable vertical plasma position. (iv) The heat pulses associated with unmitigated ELMs are unlikely to be acceptable imposing ELM free operation or active ELM control. (v) To reduce and spread heat loads, core and divertor radiation and momentum loss has to be controlled, aiming to operate with simultaneously detached upper and lower divertors. (vi) High pressure operation is likely to require active resistive wall mode (RWM) stabilisation. (vii) The conductivity distribution in structures near the plasma must be carefully selected to reduce the growth rates for the vertical instability and the RWM without damping the penetration of the of magnetic fields from active control coils too much. This article describes the initial work carried out to develop a STEP plasma control system.
Metal-organic frameworks: synthesis, properties, wound dressing, challenges and scopes in advanced wound dressing
Authors: Khan Muhammad Umar Aslam , Aslam Muhammad Azhar , Yasin Tooba , Abdullah Mohd Faizal Bin , Stojanović Goran M , Siddiqui Humaira Masood , Hasan Anwarul 
Published: July 2024

Abstract
Wound healing is a critical but complex biological process of skin tissue repair and regeneration resulting from various systems working together at the cellular and molecular levels. Quick wound healing and the problems associated with traditional wound repair techniques are being overcome with multifunctional materials. Over time, this research area has drawn significant attention. Metal-organic frameworks (MOFs), owning to their peculiar physicochemical characteristics, are now considered a promising class of well-suited porous materials for wound healing in addition to their other biological applications. This detailed literature review provides an overview of the latest developments in MOFs for wound healing applications. We have discussed the synthesis, essential biomedical properties, wound-healing mechanism, MOF-based dressing materials, and their wound-healing applications. The possible major challenges and limitations of MOFs have been discussed, along with conclusions and future perspectives. This overview of the literature review addresses MOFs-based wound healing from several angles and covers the most current developments in the subject. The readers may discover how the MOFs advanced this discipline by producing more inventive, useful, and successful dressings. It influences the development of future generations of biomaterials for the healing and regeneration of skin wounds.
Heteroploid F1 hybrids generated from Coffea canephora × C. arabica interploidy crossing
Authors: Dani  , Rokhmah D N , Supriadi H , Randriani E 
Published: July 2024

Abstract
Distant hybrids between two coffee species was considered promising for breeders to select novel genotypes highly resilient to changing global climate, despite pre- and or post-zygotic barriers. However, the different ploidy between C. arabica (2n=4x=44) and its diploid counterparts was another challenging barrier. The expected ploidy level for developed F1 hybrid was triploid. This study was aimed to identify ploidy level of F1 hybrids generated from Coffea canephora × C. arabica interploidy crossing. Ploidy determination was held using indirect methods, i.e. based on morphometric analysis of pollen and stomatal guard cells. Polar and equatorial diameter of 300 freshly collected pollen from each of six individuals of F1 hybrids were measured using ImageJ software. Stomatal frequency was measured as the number of guard cells on leaf area of 1 mm2. Pollen and stomatal guard cells of their diploid maternal and tetraploid paternal were also measured to be used as a standard for ploidy level determination. Generated datasets were immediately analysis statistically using t-Test procedure. The results shows that four of six F1 hybrid individuals had similar pollen size as well as stomatal density to diploid maternal. Meanwhile, another single individual was similar to tetraploid paternal. However, the rest of single individuals were similar to both of maternal and paternal. Based on those results, it could be inferred that there weres three different ploidy levels among F1 hybrid individuals, namely diploid, triploid, and tetraploid.
Antimicrobial Assessment of Hand Sanitizers Formulated from Neem Leaf Extract (Azadirachta indica) and Coconut Shell Liquid Smoke
Authors: Akbar S , Faisal M , Desvita H 
Published: July 2024

Abstract
The widespread use of alcohol/ethanol-based hand sanitizers has raised concerns due to the concurrent issues of skin irritation, allergies, childhood poisoning risks, and the potential for bacterial resistance to antibiotics, which may disrupt the human digestive system. This study explores the potential of Neem leaves (Azadirachta indica) and liquid smoke as natural alternatives to alcohol-based antiseptics. The objective is to assess the antimicrobial efficacy of hand sanitizers containing Neem leaf extract and coconut shell liquid smoke against Escherichia coli and Salmonella typhimurium. Hand sanitizers were prepared by mixing 4g of Neem leaf extract with varying quantities of coconut shell liquid smoke (labeled as A1, A2, A3, A4, and A5, corresponding to 0g, 1g, 3g, 5g, and 7g, respectively). distilled water was then added until the total volume reached 100 ml. The solution was then stabilized with 0.5g of Carboxyl Methyl Cellulose (CMC) and 10g of glycerin. Results indicate that formulations A1, A2, A3, and A5 exhibit moderate inhibitory activity against Escherichia coli, with inhibition zone diameters of 6.02 mm, 8.17 mm, 9.67 mm, and 9.11 mm, respectively. Notably, formulation A4 displays strong inhibitory activity (11.15 mm). For Salmonella typhimurium, formulations A4 and A5 demonstrate very strong antimicrobial properties with inhibition zones measuring 11.68 mm and 12.59 mm, respectively. These findings suggest that hand sanitizers comprising Neem leaf extract and liquid smoke possess the potential as environmentally friendly, natural antiseptics.
What is carbonic maceration coffee? A mini review on production and quality
Authors: Azmi N , Abubakar Y , Widayat HP , Nilda C , Yunika M , Andini S , Rahmi F , Muzaifa M 
Published: July 2024

Abstract
Currently there is very rapid development in the processing of coffee beans. Various types of coffee processing are currently available to produce higher quality coffee. This is related to the increasing market demand for coffee. Carbonic Maceration is a coffee processing method that is starting to develop in Indonesia. The fermentation process using the carbonate maceration method actually adapts the fermentation process implemented in the wine industry. The goal is quite simple, produce a consistent final product and add a unique and new taste compared to using conventional methods. As a relatively new process, we are trying to describe the knowledge regarding the process and quality of macerated carbonic coffee products which are still rarely studied. The purpose of this mini review is to provide an overview of the principles of carbonic maceration coffee processing, including methods, types and product quality both chemically and sensory. It is hoped that this study will provide an initial understanding of carbonic maceration coffee processing.
Edible coating effect on physicochemical properties of banana (Musa sapientum L.) during storage
Authors: Refilda R , Gustira D , Yefrida Y , Hanifa D 
Published: July 2024

Abstract
Banana (Musa sp.) is very important fruit crops in the tropical world. It is recognized for its potential health benefits and nutritional richness. Banana fruit is semi perishable food that rot quickly. Edible coating is a very useful technique to extend the shelf life of fruit and maintain quality for processing post-harvest fruits. In this research, coating of banana fruit (Musa sapientum L.) was carried out using aloe vera gel as a base material and modified by water extract of sungkai leaves. The aim of this research is to obtain the right composition of coating material to extend the shelf life of bananas. Five formulas (F1, F2, F3, F4, and F5 of coating material were prepared and coated on the Banana fruit. The coated banana fruit was evaluated for physicochemical properties using the Standard Methods at storage times of 0, 3, 6, 9, and 12 days. Banana fruit coating with formula F3 (30% Aloe vera gel, 40% Sungkai leaf extract, 2.0% CMC and 1.0% glycerol) showed the best performance on the days 9 with the weight loss 10.28+0.05%, fruit hardness 10.3+0.05 Newton, total acid titration 0.27+0.01%, Total Soluble Solid 27.67+0.58 °Brix, total antioxidants of 18.84+0.12 mgAAE/gFW and total phenolics 33.27+0.20 mgGAE/gFW compared to other compositions. In conclusion, coating Banana fruit with this coating material can extend the shelf life from 3 to 9 days.
Fairtrade coffee and the path to prosperity: a study of smallholder farmers in Bener Meriah Regency
Authors: Aulia M R , Syahputra R A , Siregar M P A , Nasution A , Bagio  
Published: July 2024

Abstract
This study delves into the causal effect of Fairtrade affiliation on coffee productivity. It employs treatment effect and propensity score matching models, utilizing data gathered from 128 randomly selected smallholder coffee farmers in Bener Meriah Regency. This study significantly expands our understanding of the role Fairtrade affiliation plays in boosting the productivity of smallholder coffee farms, all the while ensuring it has no adverse effects on the environment and its underlying factors. The findings unequivocally demonstrate that Fairtrade affiliation leads to a substantial increase in coffee productivity. Expanding Fairtrade’s reach emerges as a crucial strategy to bolster the positive impact on coffee farmers.