bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sparsity-driven deterministic sampling strategy for coded aperture x-ray computed tomography
Authors: Sonkar Munnu , Sasmal Pradip , Theeda Prasad , Sastry C S 
Published: November 2021

Abstract
The sub-sampling strategies in x-ray computed tomography (CT) have gained importance due to their practical relevance. In this direction of research, also known as coded aperture x-ray computed tomography (CAXCT), both random and deterministic strategies have been proposed in the literature. Of the techniques available, those based on compressive sensing (CS) have recently gained more traction because CS-based ideas efficiently exploit inherent duplication present in the system. The quality of the reconstructed CT images nevertheless depends on the sparse signal recovery properties of the sub-sampled Radon matrices. In the present work, we optimize CAXCT deterministically in such a way that the corresponding sub-sampled Radon matrices remain close to the equiangular tight frames for better numerical behaviour. We show that this optimization, involving the Khatri–Rao product, leads to a non-negative sparse approximation. While comparing and contrasting our method with its existing counterparts, we show that the proposed algorithm is computationally less involved. Finally, we demonstrate efficacy of the proposed deterministic sub-sampling strategy in recovering CT images in both noiseless and noisy cases.
Nano-dendrite structured cobalt phosphide based hybrid supercapacitor with high energy storage and cycling stability
Authors: Chen Xiaoyu , Chang Pu , Zhang Shuo , Guan Lixiu , Ren Guohe , Tao Junguang 
Published: November 2021

Abstract
The supercapacitors possessing high energy storage and long serving period have strategic significance to solve the energy crisis issues. Herein, fluffy nano-dendrite structured cobalt phosphide (CoP) is grown on carbon cloth through simple hydrothermal and electrodeposition treatments (CoP/C-HE). Benefit from its excellent electrical conductivity and special structure, CoP/C-HE manifests a high specific capacity of 461.4 C g−1 at 1 A g−1. Meanwhile, the capacity retention remains 92.8% over 10 000 cycles at 5 A g−1, proving the superior cycling stability. The phase conversion of Co2P during the activation process also contributes to the improved performance. The assembled two-electrode asymmetric supercapacitor demonstrates excellent performance in terms of energy density (42.4 W h kg−1 at a power density of 800.0 W kg−1) and cycling stability (86.3% retention over 5000 cycles at 5 A g−1), which is superior to many reported cobalt-based supercapacitors. Our work promotes the potential of transition metal phosphides for the applications in supercapacitors.
Investigation of the laser-induced breakdown plasma, acoustic vibrations and dissociation processes of water molecules caused by laser breakdown of colloidal solutions containing Ni nanoparticles
Authors: Baimler I V , Simakin A V , Gudkov S V 
Published: November 2021

Abstract
In this work the process of optical breakdown under laser irradiation by nanosecond pulses with an energy of 650 mJ of aqueous solutions of Ni nanoparticles is investigated. A monotonic change in the number of breakdowns, the average distance between closest breakdowns, the average plasma size of an individual breakdown, the luminosity of a plasma flash, the intensity of acoustic signals, and the rate of formation of dissociation products—O2, H2, OH•, and H2O2 with an increase in the irradiation time was established. With an increase in the concentration of nanoparticles, the measured values change non-monotonically. The maximum luminosity of a plasma flash is observed at a nanoparticle concentration of 109 NP ml−1 and 1010 NP ml−1 and reaches 350 cd m−2. The maximum pressure at the shock front is 1.5–2 MPa at a nanoparticle concentration of 1010 NP ml−1. The maximum rates of generation of O2, H2, OH• and H2O2 are observed at concentrations of 109 NP ml−1 and 1010 NP ml−1. Correlation analysis of the studied physicochemical phenomena shows that the formation of molecular gases is associated with acoustic processes, and the formation of radical products and hydrogen peroxide correlates with the physicochemical properties of plasma.
Molecular motor-driven filament transport across three-dimensional, polymeric micro-junctions
Authors: Reuther Cordula , Steenhusen Sönke , Meinecke Christoph Robert , Surendiran Pradheebha , Salhotra Aseem , Lindberg Frida W , Månsson Alf , Linke Heiner , Diez Stefan 
Published: November 2021

Abstract
Molecular motor-driven filament systems have been extensively explored for biomedical and nanotechnological applications such as lab-on-chip molecular detection or network-based biocomputation. In these applications, filament transport conventionally occurs in two dimensions (2D), often guided along open, topographically and/or chemically structured channels which are coated by molecular motors. However, at crossing points of different channels the filament direction is less well determined and, though crucial to many applications, reliable guiding across the junction can often not be guaranteed. We here present a three-dimensional (3D) approach that eliminates the possibility for filaments to take wrong turns at junctions by spatially separating the channels crossing each other. Specifically, 3D junctions with tunnels and overpasses were manufactured on glass substrates by two-photon polymerization, a 3D fabrication technology where a tightly focused, femtosecond-pulsed laser is scanned in a layer-to-layer fashion across a photo-polymerizable inorganic–organic hybrid polymer (ORMOCER®) with µm resolution. Solidification of the polymer was confined to the focal volume, enabling the manufacturing of arbitrary 3D microstructures according to computer-aided design data. Successful realization of the 3D junction design was verified by optical and electron microscopy. Most importantly, we demonstrated the reliable transport of filaments, namely microtubules propelled by kinesin-1 motors, across these 3D junctions without junction errors. Our results open up new possibilities for 3D functional elements in biomolecular transport systems, in particular their implementation in biocomputational networks.
Dynamics of string-like states of a hole in a quantum antiferromagnet: a diagrammatic Monte Carlo simulation
Authors: Diamantis Nikolaos G , Manousakis Efstratios 
Published: November 2021

Abstract
The dynamics of a hole motion in a quantum antiferromagnet has been studied in the past three decades because of its relationship to models related to superconductivity in cuprates. The same problem has received significant attention because of its connection to very recent experiments of the dynamics of ultra-cold atoms in optical lattices where models of strongly correlated electrons can be simulated. In this paper we apply the diagrammatic Monte Carlo method to calculate the single-hole Green’s function in the t–J model, where the J term is linearized, in a wide range of imaginary-time with the aim to examine the polaron formation and in particular the details of the contribution of the so-called string excitations found in such recent experiments. We calculate the single-hole spectral function by analytic continuation from imaginary to real time and study the various aspects that constitute the string picture, such as, the energy–momentum dependence of the main quasiparticle peak and its residue, the internal excitations of the string which appear as multiple peaks in the spectral function as well as their momentum dependence. We find that the earlier analysis of the spectral function based on a mobile-hole connected with a string of overturn spins and the contribution of the internal string excitations as obtained from the non-crossing approximation is accurate.
Coexistence of ferromagnetism and superconductivity in MWCNT/Bi2SiO5 nanocomposites
Authors: Haldar Toton , Kumar V V Ravi Kanth 
Published: November 2021

Abstract
This work explores the temperature and field-dependent magnetic properties of Bi2SiO5 (BSO)/multiwall carbon nanotube (MWCNT) nanocomposites prepared by hydrothermal method using different content of magnetic MWCNT (from 1 to 20 wt%). A pure BSO prepared by the same method was also studied as a reference. Phase purity and structure of the pure BSO and CBSO nanocomposites were analyzed by employing the Rietveld refinement of an X-ray diffraction pattern. DC magnetization analysis confirms the co-existence of multiple magnetic phases in CBSO nanocomposites, where a paramagnetic (PM) to ferromagnetic (FM) transition experiences at ∼33 K, and a cluster spin glass behavior at near Curie temperature (i.e., TC ∼25 K). A weak superconducting transition (TSC) at around ∼23 K was observed for all the CBSO nanocomposite samples (i.e., 2.5 wt% MWCNT and above samples). Moreover, a novel feature of these nanocomposites is that they exhibit a complex magnetism corresponding to the co-existence of ferromagnetism and superconductivity. This behavior can be exploited to engineer a magnetic CBSO composites system with the magnetic transition tune by compositional structure, with interesting potential applications.
Swampland conjecture and inflation model from brane perspective
Authors: Sadeghi J , Pourhassan B , Noori Gashti S , Upadhyay S 
Published: November 2021

Abstract
Over the past few decades, inflation models have been studied by researchers from different perspectives and conditions in order to introduce a model for the expanding universe. In this paper, we introduce a modified f(R) gravitational model as (R + γ
R

p
) in order to examine a new condition for inflation models. Given that our studies are related to a modified f(R) gravitational model on the brane, therefore we will encounter modified cosmological parameters. So, we first introduce these modified cosmological parameters such as spectral index, a number of e-folds and etc. Then, we apply these conditions to our modified f(R) gravitational model in order to adapt to the swampland criteria. Finally, we determine the range of each of these parameters by plotting some figures and with respect to observable data such as Planck 2018.
Magnetic properties of a fullerene-like X20 structure with embedded metal atom
Authors: Gao Zhong-yue , Lv Dan , Wang Wei , Yang Lin-mei , Sun Lei , Wang Feng 
Published: November 2021

Abstract
Monte Carlo simulation has been used to study magnetic and thermodynamic properties of a ferrimagnetic mixed-spin (1, 3/2) Ising fullerene-like X20 structure with embedded metal atom. Under the influence of the anisotropy and the concentration of surface shell atom, the system tends to show the multiple stable saturation values of magnetization (M = 0.91, 0.85, 0.77, 0.64, 0.50 and 0.023) and the values of intermediate metastable magnetization (M = 0.88, 0.76 and 0.60) at zero temperature. The blocking temperature T

B
becomes higher by decreasing the anisotropies (∣D

C
∣, ∣D

S
∣), or increasing the exchange coupling ∣J

CS
∣, the magnetic field h and the concentration of surface shell atom P

S
. Some interesting phenomena have been found such as the double-loop hysteresis behavior for the relatively large values of ∣D

S

∣ (≥2.0), originating from the competition between different physical parameters.
Cosmological parameters from the likelihood analysis of the galaxy power spectrum and bispectrum in real space
Authors: Oddo Andrea , Rizzo Federico , Sefusatti Emiliano , Porciani Cristiano , Monaco Pierluigi 
Published: November 2021

Abstract
We present a joint likelihood analysis of the halo power spectrum and bispectrum in real space. We take advantage of a large set of numerical simulations and of an even larger set of halo mock catalogs to provide a robust estimate of the covariance properties. We derive constraints on bias and cosmological parameters assuming a theoretical model from perturbation theory at one-loop for the power spectrum and tree-level for the bispectrum. By means of the Deviance Information Criterion, we select a reference bias model dependent on seven parameters that can describe the data up to k
max,P = 0.3 h Mpc-1 for the power spectrum and k
max,B = 0.09 h Mpc-1 for the bispectrum at redshift z = 1. This model is able to accurately recover three selected cosmological parameters even for the rather extreme total simulation volume of 1000h
-3 Gpc3. With the same tools, we study how relations among bias parameters can improve the fit while reducing the parameter space. In addition, we compare common approximations to the covariance matrix against the full covariance estimated from the mocks, and quantify the (non-negligible) effect of ignoring the cross-covariance between the two statistics. Finally, we explore different selection criteria for the triangular configurations to include in the analysis, showing that excluding nearly equilateral triangles rather than simply imposing a fixed maximum k
max,B on all triangle sides can lead to a better exploitation of the information contained in the bispectrum.
Quantum gravity effects on spectroscopy of Kerr-Newman black hole in gravity’s rainbow
Authors: Liu Cheng-Zhou , Tao Jin-Jun 
Published: November 2021

Abstract
The effects of quantum gravity on spectroscopy for the charged rotating gravity’s rainbow are investigated in this paper. By utilizing an action invariant obtained from particles tunneling through the event horizon, the entropy and area spectrum for the modified Kerr-Newman black hole are derived. The equally spaced entropy spectrum characteristic of Bekenstein’s original derivation is recovered. And, the entropy spectrum is independent of the energy of the test particles, although the gravity’s rainbow itself is the energy dependent. Such that, the quantum gravity effects of gravity’s rainbow has no influence on the entropy spectrum. On the other hand, due to the spacetime quantum effects, the obtained area spectrum is different from the original Bekenstein spectrum. It is not equidistant and is dependent on the horizon area. And that, by analyzing the area spectrum from a specific rainbow function, a minimum area with a Planck scale is derived for the event horizon. At this point, the area quantum is zero and the black hole radiation stops. Thus, the black hole remnant for the gravity’s rainbow is obtained from the area quantization. In addition, the entropy for the modified Kerr-Newman black hole is calculated and the quantum correction to the area law is obtained and discussed.
Effects of brain-computer interface with functional electrical stimulation for gait rehabilitation in multiple sclerosis patients: preliminary findings in gait speed and event-related desynchronization onset latency
Authors: Carrere L Carolina , Taborda Melisa , Ballario Carlos , Tabernig Carolina 
Published: November 2021

Abstract

Objective. Brain-computer Interfaces (BCI) with functional electrical stimulation (FES) as a feedback device might promote neuroplasticity and hence improve motor function. Novel findings suggested that neuroplasticity could be possible in people with multiple sclerosis (pwMS). This preliminary study explores the effects of using a BCI-FES in therapeutic intervention, as an emerging methodology for gait rehabilitation in pwMS. Approach. People with relapsing-remitting, primary progressive or secondary progressive MS were evaluated with the inclusion criteria to enroll the nine participants required by the statistically computed sample size. Each patient trained with a BCI-FES during 24 sessions distributed in eight weeks. The effects were evaluated on gait speed (Timed 25 Foot Walk), walking ability (12-item Multiple Sclerosis Walking Scale), quality of life measures, the true positive rate as the BCI-FES performance metric and the event-related desynchronization (ERD) onset latency of the sensorimotor rhythms. Main results. Seven patients completed the therapeutic intervention. A statistically and clinically significant post-treatment improvement was observed in gait speed, as a result of a reduction in the time to walk 25 feet (−1.99 s, p = 0.018), and walking ability (−31.25 score points, p = 0.028). The true positive rate showed a statistically significant improvement (+15.87 score points, p = 0.018). An earlier ERD onset latency (−180 ms) after treatment was found. Significance. This is the first study that explored gait rehabilitation using BCI-FES in pwMS. The results showed improvement in gait which might have been promoted by changes in functional brain connections involved in sensorimotor rhythm modulation. Although more studies with a larger sample size and control group are required to validate the efficacy of this approach, these results suggest that BCI-FES technology could have a positive effect on MS gait rehabilitation.
Forced Response Approach on Parametric Vibration with Time Periodic Coefficient
Authors: Huang Dishan , Li Yingxue 
Published: November 2021

Abstract
In this study, based on Galerkin discretization and frequency splitting, the forced vibration response of a large span cable with time periodic tension is approached as a closed-form solution, i.e. a special trigonometric series with mode functions. According to the principle of modulation feedback, the forced vibration response solution can be expressed as a series of linear combination of external excitation frequency and parametric excitation frequency with modes. Using orthogonality relation, the formula of forced vibration response approach is obtained. Investigations show that the presented approach computes the forced vibration response with higher accuracy. Therefore, this study is available to analyze the vibration of a large span cable with time periodic tension, and the characteristics of vibration response could be used as an important information source for the failure diagnosis and the health monitoring of cable structure.
Has the ultra low emission zone in London improved air quality?
Authors: Ma Liang , Graham Daniel J , Stettler Marc E J 
Published: November 2021

Abstract
London introduced the world’s most stringent emissions zone, the Ultra Low Emission Zone (ULEZ), in April 2019 to reduce air pollutant emissions from road transport and accelerate compliance with the EU air quality standards. Combining meteorological normalisation, change point detection, and a regression discontinuity design with time as the forcing variable, we provide an ex-post causal analysis of air quality improvements attributable to the London ULEZ. We observe that the ULEZ caused only small improvements in air quality in the context of a longer-term downward trend in London’s air pollution levels. Structural changes in nitrogen dioxide (NO2) and ozone (O3) concentrations were detected at 70% and 24% of the (roadside and background) monitoring sites and amongst the sites that showed a response, the relative changes in air pollution ranged from −9% to 6% for NO2, −5% to 4% for O3, and −6% to 4% for particulate matter with an aerodynamic diameter less than 2.5 μm (PM2.5). Aggregating the responses across London, we find an average reduction of less than 3% for NO2 concentrations, and insignificant effects on O3 and PM2.5 concentrations. As other cities consider implementing similar schemes, this study implies that the ULEZ on its own is not an effective strategy in the sense that the marginal causal effects were small. On the other hand, the ULEZ is one of many policies implemented to tackle air pollution in London, and in combination these have led to improvements in air quality that are clearly observable. Thus, reducing air pollution requires a multi-faceted set of policies that aim to reduce emissions across sectors with coordination among local, regional and national government.
Evaluation of coastal pollution in Banda Aceh based on BOD5 and DO approach
Authors: Wisha U J , Kurnianda V 
Published: November 2021

Abstract
The demand for preserving the aquatic environment is a top priority for the Indonesian government. The Banda Aceh coast has experienced anthropogenic developments since the 2004 tsunami hit. During the preliminary investigation in 2017, it indicated that the Banda Aceh coast had been contaminated. Here, we investigated water quality in Banda Aceh coast has been conducted during 2018-2019. We employed the Winkler titration for determining Biological Oxygen Demand (BOD5) and Dissolved Oxygen (DO). Furthermore, we generated spatial analysis to show the distribution of BOD5 and DO around the Banda Aceh coast. As a result, BOD5 has been decreased with the value of 1.33 mg/L. Interestingly, the increased DO value of 1.48 mg/L indicated the presence of autotroph biota producing an oxygen atom during 2018-2019. A contrary influence of BOD5 and DO on NO3- was identified, which approximately 50% concentration of nutrient determined by oxygen availability in 2018, while it was less than 5% for the 2019 survey. In conclusion, we suspect that the Banda Aceh coast is categorized as polluted waters for marine biota and tourism.
Seaweed farming and seaweed capture fishermen phenomenon in Sebatik Strait, Nunukan Regency
Authors: Muawanah U , Syafitri N , Zulham A , Yanti B V I , Setyawidati N A R 
Published: November 2021

Abstract
Nunukan Regency - North Kalimantan, is currently one of the biggest producers of Kappaphycus alvarezii in Indonesia. The large number of seaweed farmers showed that the seaweed business economically increases the Nunukan and surrounding community’s income. An interesting phenomenon in the Nunukan Regency is the fishermen who capturing seaweed drifted due to sea currents. Conflicts of sea area utilization are still an issue in Sebatik Strait. This paper aims to analyze the prevalence of conflicts arising from space competition between seaweed catcher and seaweed farmer. This study was conducted using existing field data and reviewing secondary data usinga descriptive and quantitative approach. The field data was obtained by in-depth interviews and distributed questionnaires to seaweed farmers and seaweed stakeholders in Nunukan region. The recommendations for seaweed business development strategies are divided into three strategies: short-term, mid-term, and long-term strategies in the Sebatik Strait, presented at the end of this paper.
Optimization of an effective growth medium for biomass production of Bacillus cereus
Authors: Feliatra F , Batubara U M , Effendi I , Adelina A 
Published: November 2021

Abstract
Protein is the main source of nutrition in fish feed. It is necessary to use bacterial single-cell protein (SCPs) as a substitute for conventional protein. This study aims to determine the effectiveness of tofu liquid waste as a growth medium for biomass production of Bacillus cereus as an SCPs. The isolates used were B. cereus SN7 and B. cereus consortium (combination of 5 isolates of B. cereus with different strains). The method used was experimental where isolates were cultured in a medium containing tofu liquid waste with different concentrations (8%, 10%, and 12%) enriched with 10% skim milk. Furthermore, the analysis of an effective growth medium was carried out by three methods, namely total plate count, optical density, and cell-dry weight. Cell biomass measurements were carried out for 24 hours with an observation time of every 6 hours. The results showed the best growth medium used in the culture of B. cereus SN7 and B. cereus consortium was tofu liquid waste at a concentration of 12% enriched with 10% skim milk. In conclusion, the cell mass of B. cereus SN7 and B. cereus consortium significantly increased at 6 to 12 hours.