bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oscillatory translational instabilities of spot patterns in the Schnakenberg system on general 2D domains
Authors: Tzou J C , Xie S 
Published: March 2023

Abstract
For a bounded 2D planar domain Ω, we investigate the impact of domain geometry on oscillatory translational instabilities of N-spot equilibrium solutions for a singularly perturbed Schnakenberg reaction-diffusion system with

activator-inhibitor diffusivity ratio. An N-spot equilibrium is characterized by an activator concentration that is exponentially small everywhere in Ω except in N well-separated localized regions of

extent. We use the method of matched asymptotic analysis to analyze Hopf bifurcation thresholds above which the equilibrium becomes unstable to translational perturbations, which result in

-frequency oscillations in the locations of the spots. We find that stability to these perturbations is governed by a nonlinear matrix-eigenvalue problem, the eigenvector of which is a 2N-vector that characterizes the possible modes (directions) of oscillation. The

2
N
×
2
N

matrix contains terms associated with a certain Green’s function on Ω, which encodes geometric effects. For the special case of a perturbed disk with radius in polar coordinates

r
=
1
+
σ
f
(
θ
)

with

0
<
ε
≪
σ
≪
1

,

θ
∈
[
0
,
2
π
)

, and

f
(
θ
)

2π-periodic, we show that only the mode-2 coefficients of the Fourier series of f impact the bifurcation threshold at leading order in σ. We further show that when

f
(
θ
)
=
cos
2
θ

, the dominant mode of oscillation is in the direction parallel to the longer axis of the perturbed disk. Numerical investigations on the full Schnakenberg PDE are performed for various domains Ω and N-spot equilibria to confirm asymptotic results and also to demonstrate how domain geometry impacts thresholds and dominant oscillation modes.
Saturation correction for a piezoelectric shunt absorber based on 2:1 internal resonance using a cubic nonlinearity
Authors: Shami Zein Alabidin , Giraud-Audine Christophe , Thomas Olivier 
Published: March 2023

Abstract
In this study, we present a theoretical and experimental analysis of an antiresonance detuning correction for a nonlinear piezoelectric shunt absorber based on a two-to-one internal resonance. Thanks to this purely nonlinear feature, the oscillations of the primary system become independent of the forcing at a particular antiresonance frequency, thus creating an efficient reduction of the vibration. Past works of the literature present the design of the piezoelectric shunt and show that it is subjected to a softening behavior that detunes the antiresonance frequency as a function of the amplitude and thus degrades the performance. It is also shown that this softening behavior is caused by some non-resonant terms present in the equations, linked to the piezoelectric coupling. To counteract this undesired effect, we propose in this work to add a cubic nonlinearity in the shunt circuit, in addition to the quadratic one already present. Its tuning is based on a normal form analysis already published, which shows how cubic nonlinearities can cancel the effect of quadratic non-resonant terms. The present article describes the main features of the theory and focuses on the experimental proof of concept of this antiresonance detuning correction as well as the analysis of its range of validity. It is applied to the damping of the first bending mode of a hydrodynamic foil structure.
Non-destructive Elemental Analysis of Lunar Materials with Negative Muon Beam at J-PARC
Authors: Chiu I-Huan , Terada Kentaro , Takahito Osawa , Park Changkun , Takeshita Soshi , Miyake Yasuhiro , Ninomiya Kazuhiko 
Published: March 2023

Abstract
In the last decade, non-destructive elemental analysis using negative muon beams advanced significantly. This method can be used to determine the elemental composition of bulk materials without causing damage. In this study, we performed a negative muon irradiation experiment for a Northwest Africa 482 lunar meteorite (NWA482), which was installed in a stainless steel analysis chamber. The analysis chamber was filled with helium gas to suppress the background signals caused by air-scattering muons. The muonic X-rays from Al, Fe, Ca, Mg, Si, and O in the samples were detected using six high-purity germanium semiconductor detectors arranged around the analysis chamber. To correct the X-ray self-absorption effect of the samples, a Monte-Carlo simulation using Geant4 toolkit was used. Based on the quantitative analysis for muonic X-ray measurement with the correction application from the simulation, we successfully investigated the analytical sensitivity of each element in meteorites based on the NWA482 data.
Design of the surface muon beamline of MELODY
Authors: Chen Cong , Bao Yu , Vassilopoulos Nikolaos 
Published: March 2023

Abstract
A Muon station for sciEnce, technoLOgy and inDustrY (MELODY) has been listed in the CSNS upgrade plan. Up to 5Hz of proton pulses will be extracted from the RCS ring to a stand-alone target station. One surface muon will be constructed during CSNS II and another decay muon beamline and more terminals are designed for the future. In this report, we describe the design of the surface muon beamline.
The Ultra-Slow Muon beamline at J-PARC: present status and future prospects
Authors: Kanda S , Teshima N , Adachi T , Ikedo Y , Miyake Y , Nagatani Y , Nakamura S , Oishi Y , Shimomura K , Strasser P , Umezawa T 
Published: March 2023

Abstract
At J-PARC MLF, MUSE provides the world-highest flux of pulsed muon beams. U-Line, one of the four beamlines in the facility, features an intense surface muon beam from Super-Omega and Ultra-slow muon generated by laser ionization of thermal muonium in vacuo. The Ultra-slow muon beam is characterized by variable energy from sub-keV to tens of keV and a time resolution of several tens of times better than that of ordinary pulsed beams. These features enable the study of interesting phenomena localized at surfaces and near interfaces and fast dynamics that cannot be observed with ordinary pulsed beams. Commissioning of the beamline and instruments is underway in preparation for the start of user programs. This paper presents an overview of the facility, its current status, and its prospects.
A simulation study of muon transport in the Ultra-Slow Muon beamline at J-PARC
Authors: Teshima N , Kanda S , Adachi T , Ikedo Y , Miyake Y , Nagatani Y , Oishi Y , Shimomura K , Strasser P 
Published: March 2023

Abstract
The Super-Omega beamline at J-PARC Materials and Life Science Experimental Facility provides an intense pulsed slow positive muon beam. Combined with a muonium production target and laser light for muonium ionization, the pulsed ultra-slow muon facility has been developed. At the facility, a spectrometer for muon spin rotation measurements using ultra-slow muons is under commissioning. In this paper, we will report on the current status of the beam optics optimization of slow muon transport and ultra-slow muon extraction to improve the intensity and quality of the ultra-slow muon beam.
Magnetic ground state of YbCo2Zn20 probed by muon spin relaxation
Authors: Higemoto Wataru , Satoh Kazuhiko , Ito Takashi U , Ohishi Kazuki , Saiga Yuta , Kosaka Masashi , Matsubayashi Kazuyuki , Uwatoko Yoshiya 
Published: March 2023

Abstract
The cubic compound YbCo2Zn20 has huge electronic specific heat coefficient γ=7900 mJ/molK2 and its ground state could be located in the vicinity of the quantum critical point. To investigate magnetic ground state, we have carried out muon spin relaxation measurements and confirmed non-magnetic ground state with fluctuating tiny magnetic moment.
Impact of Mn-Pn intermixing on magnetic properties of an intrinsic magnetic topological insulator: the µSR perspective
Authors: Sahoo M , Salman Z , Allodi G , Isaeva A , Folkers L , Wolter AUB , Büchner B , De Renzi R 
Published: March 2023

Abstract
We investigated the magnetic properties of polycrystalline samples of the intrinsic magnetic topological insulators MnPn2Te4, with pnictogen Pn = Sb, Bi, by bulk magnetization and µSR. DC susceptibility detects the onset of magnetic ordering at TN
= 27 K and 24 K and a field dependence of the macroscopic magnetization compatible with ferri- (or ferro-) and atiferro- magnetic ordering, respectively. Weak transverse field (wTF) Muon Spin Rotation (µSR) confirms the homogeneous bulk nature of magnetic ordering at the same two distinct transition temperatures. Zero Field (ZF) µSR shows that the Sb based material displays a broader distribution of internal field at the muon, in accordance with a larger deviation from the stoichiomectric composition and a higher degree of positional disorder (Mn at the Pn(6c) site), which however does not affect significantly the sharpness of the thermodynamic transition, as detected by the muon magnetic volume fraction and the observability of a critical divergence in the longitudinal and transverse muon relaxation rates.
The interaction between a positive muon and multiple quadrupolar nuclei
Authors: Bentley Nathan P , Blundell Stephen J 
Published: March 2023

Abstract
A positively charged muon implanted in copper sits at an octahedral interstitial site and experiences a magnetic dipolar coupling with six nearest-neighbour quadrupolar I = 3/2 copper nuclei. The resulting avoided level crossing resonance observed as a function of magnetic field provides a means of studying these interactions and understanding the effect of the electric-field gradient due to the muon acting on the quadrupolar nuclei. The effect is usually modelled by considering the interaction between the positive muon and a single copper nucleus, but the other five copper nuclei are equally important. By solving the problem in the full 2(2I + 1)6 = 8192-dimensional Hilbert space, we demonstrate the effect of these additional interactions.
Sodium Diffusion in Hard Carbon Studied by Small- and Wide-Angle Neutron Scattering and Muon Spin Relaxation
Authors: Ohishi Kazuki , Igarashi Daisuke , Tatara Ryoichi , Kawamura Yukihiko , Hiroi Kosuke , Suzuki Jun-ichi , Umegaki Izumi , Nishimura Shoichiro , Koda Akihiro , Komaba Shinichi , Sugiyama Jun 
Published: March 2023

Abstract
Hard carbon is the most common anode material for Na-ion battery. The structure of the hard carbon and the dynamics of Na-ion in hard carbon were studied with small- and wide-angle neutron scattering and muon spin relaxation technique. The neutron scattering revealed the increase of interlayer distance between graphenes and decrease of the size of nanopores with increasing sodium intercalation in hard carbon. The muon spin relaxation revealed that a systematic increase in the field fluctuation rate with increasing temperature evidenced a thermally activated sodium diffusion. Assuming the two-dimensional diffusion of Na-ion in the graphene layers, the self-diffusion coefficient of Na-ion was estimated to be 2.6 × 10−11 cm2/s at 310 K, with a thermal activation energy of 39(7) meV.
Comparison of the efficacy of different biodegradable membranes in guided bone/tissue regeneration: a systematic review and network meta-analysis
Authors: Zhou Zili , Yun Jiahao , Li Jie , Chen Yimeng , Duan Tingting , Wang Liqiao , Han Jianmin , Jiang Heng Bo , Niu Guangliang 
Published: March 2023

Abstract
Guided bone/tissue regeneration (GBR/GTR) is commonly used in dental treatment. The desired bone/tissue regeneration is achieved by placing a barrier membrane over the defect to avoid the downward growth of faster-growing connective and epithelial tissue into the defect. This review aimed to evaluate osteogenic properties, degradation characteristics, and postoperative complications of eight biodegradable membranes in animal experiments, including non-crosslinked collagen membrane (NCCM), crosslinked collagen membrane (CCM), silk membrane (SM), polylactic-co-glycolic acid, polylactic acid, polyethylene glycol hydrogel, polycaprolactone (PCL), and magnesium alloys. Seven electronic databases (PubMed, Embase, Web of Science, Cochrane Library, Science Direct, Wiley, Scopus and Google Scholar) were screened. Study selection, data extraction and quality assessment were made in duplicate. The SYRCLE assessment tool, CERQual (Confidence in the Evidence from Reviews of Qualitative Research) tool and GRADE tool were used to grade the risk of bias and level of evidence. A total of 2512 articles were found in the electronic database. Finally, 94 articles were selected, of which 53 were meta-analyzed. Surface under the cumulative ranking curve showed the best results for new bone formation in the magnesium barrier membrane group, followed by SM, PCL, NCCM, and CCM. Qualitative analysis showed good biocompatibility for natural polymer membranes and a longer degradation time for synthetic polymer membranes. In addition, 34 studies all showed high bias risks, while other studies had unclear bias risks. Natural polymer membranes were more effective for bone regeneration and magnesium alloys were proved to be promising barrier materials that warrant future research.
3D printed hydrogel scaffold promotes the formation of hormone-active engineered parathyroid tissue
Authors: Gokyurek Mervesu , Guler Sumeyra , Gokyer Seyda , Yazihan Nuray , Akıncı Melih , Gülçelik Mehmet Ali , Yilmaz Kerim Bora , Yilgor Pinar 
Published: March 2023

Abstract
The parathyroid glands are localized at the back of the thyroid glands in the cervical region and are responsible for regulation of the calcium level in the blood, through specialized cells that sense Ca2+ and secrete parathyroid hormone (PTH) in response to a decline in its serum level. PTH stimulates the skeleton, kidneys and intestines and controls the level of Ca2+ through specialized activities. Iatrogenic removal of the parathyroid gland, as well as damage to its vascular integrity during cauterization are some of the common complications of thyroid surgery. Therefore, regeneration and/or replacement of malfunctioning parathyroid tissue is required. Tissue engineering is an emerging and promising field for patients with organ failure with recent pioneering clinical applications. The success of tissue engineering strategy depends on the use of proper cells, bioactive factors that stimulate the activities of these cells and scaffolds that are produced to recapitulate the tissue structure and support the function of the engineered tissues. 3D printing is a developing strategy for the production of these scaffolds by providing a delicate control over their structure and properties. In this study, human primary parathyroid cells were successfully isolated and their viability and ability to secrete PTH upon stimulation with different levels of Ca2+ were shown in vitro. These cells were then seeded onto 3D printed alginate scaffolds and 3D bioprinted within alginate bioink, and cell viability as well as the ability to secrete PTH upon stimulation were also demonstrated. Therefore, functional hormone-active parathyroid tissue substitute was engineered in vitro through 3D printed hydrogels and autologous cells.
Nano-hydroxyapatite/collagen composite as scaffold material for bone regeneration
Authors: Kavitha Sri A , Arthi C , Neya N R , Hikku G S 
Published: March 2023

Abstract
Regenerative medicine is one of the applications of tissue engineering technology that has upsurged the hope of reforming defective organs, especially bones. Bone regeneration is a natural process but becomes complicated under trauma and disease conditions. Even though there are various conventional methods, the usage of scaffolds serves to be a promising technique where they act as the supporting material and the necessary nutrient factors are supplemented alongside, which facilitates the attachment and growth of cells over the scaffold’s surface. Human bone is mainly comprised of a hydroxyapatite (HA)/collagen complex. Recently, reports validated that the HA in the nano regime showed higher cell adherence and subsequent growth. Therefore, while using nano-HA/collagen complex as a scaffold material, the limitations of conventional routes of bone regeneration can be minimized. In this context, the present review focuses on the use and fabrication of nano-HA/collagen complex as a scaffold material for the bone regeneration process.
A possible deforestation-induced synoptic-scale circulation that delays the rainy season onset in Amazonia
Authors: Commar Luiz Felipe Sant’Anna , Abrahão Gabriel Medeiros , Costa Marcos Heil 
Published: March 2023

Abstract
The physical hydroclimate system of the Amazon functions on several spatial and temporal scales. Large-scale processes control the main seasonal patterns of atmospheric circulation and rainfall. Seasonal variability in solar forcing, associated with the low rainforest albedo, provides energy for continental heating, convection, and the onset of the South American monsoon. Mesoscale processes cause localized circulations such as river breeze and deforestation breeze. We assessed the impact of different deforestation scenarios for the mid-century last decade rainy season. Here we describe a yet unreported synoptic-scale circulation that delays the rainy season onset in southern Amazonia. This model-predicted circulation is driven by extensive (ca. 40%) deforestation patterns and may last as long as two months. This persistent anomalous circulation may result in a rainy season onset delay of 30–40 d compared to the historical period. Like other synoptic-scale phenomena, differences in surface heating drive this circulation. Given the unabated deforestation trends, the consequences for local ecosystems, agriculture, and power generation of delayed rainy season onset associated with this circulation may be difficult to revert.
Maintenance process for the joint seismic-and-electromagnetic monitoring in low-ambient noise areas: the seismic gradient system
Authors: Nepeina K S , Rybin A K , Kaznacheev P A 
Published: March 2023

Abstract
The project of the joint seismic-and-electromagnetic monitoring in low-ambient noise areas is aimed at studying the phenomena associated with the deformation of the Earth’s crust. The arrangements set of the geophysical monitoring in low-ambient noise areas is proposed. The paper describes in detail the technological scheme being of monitoring of the modern geodynamic activity with a magnetotelluric soundings method and a small seismic array presented as the seismic gradient system (SGS). Technical explanations, safety rules, equipment calibration and maintenance, and the technological schemes of the method of obtaining and archiving data are given. Maintenance procedures using SGS with geophones in Tien Shan to determine the endogenous component of the seismic field are described. We investigate a common workflow chart for SGS and main programs for the data caption and data processing. The proposed scheme has been tested and requires the application and adoption to the passive geophysical monitoring routine.
Intelligent control System wide-reach Sprinklers circular action
Authors: Zhuravleva L A 
Published: March 2023

Abstract
The relevance of the introduction of intelligent control systems for agricultural machinery in the modern world is increasing every year due to the development of more and more global projects in the field of automation and robotics. The purpose of the research was to develop algorithmic software for an intelligent control system for wide-reach sprinkler machines for autonomous operation in the implementation of environmentally safe, high-quality irrigation. The article considers the possibility of matching the irrigation norm issued by the machine to the level of moisture reserves of the field for circular-acting machines, reducing the environmental load on the soil and preserving fertility. The use of an intelligent control system with the proposed algorithm of operation will improve the quality and environmental safety of irrigation, as well as ensure resource savings, in particular irrigation water savings.
Biodiversity of the microbiome as an indicator of phytomeliorative soil transformation
Authors: Riksen V S , Korobova L N 
Published: March 2023

Abstract
40% of the territory of Western Siberia is occupied by solonetzes, used mainly for growing forage grasses. The phytomeliorative effect of yellow sweet clover (cultivated in crop rotation at the Siberian Federal Research Center of Agrobiotechnologies (SFSCA) of the Russian Academy of Sciences (RAS) for 31 years), as well as post crop rotation grassing with a mixture of brome and alfalfa (the mixture was sown after twenty years of crop rotation) on the microflora of medium solonetz was studied. It is shown that the cultivation of phytomeliorants has led to an increase in the representation of classes and orders of bacteria in the microbiome of the medium solonetz, associated with nitrogen fixation and mineralization activity of the soil in relation to nitrogen-containing substances. In the post crop rotation grassing variant, a low bacterization of the soil with Verrucomicrobia and a high, as in virgin soil, Acidobacteria were found.
Fish fauna of North European Russia’s water ecosystems affected by artificially-induced pollution
Authors: Ilmast N V , Sterligova O P 
Published: March 2023

Abstract
The composition of the fish population of three water bodies in the Kenti River system (White Sea basin), polluted by waste from a mining concentration plant, was analyzed. Only four out of 12 fish species of the Kenti River system (pike, burbot, bleak and roach) occur in all the water bodies studied. The fish population is dominated by roach. Smelt and dace were shown to be most sensitive to industrial waste. The closer to the source of pollution, the smaller the number of fish species in the lake. The impoverishment of the fish fauna is largely due to its (alkaline) habitat and the loss of spawning and growing conditions for juveniles (small areas occupied by aquatic vegetation).
Probabilistic assessment of water quality by total hardness
Authors: Yalaletdinova A V , Malkova M A , Vozhdaeva Y S , Kantor E A 
Published: March 2023

Abstract
Monitoring of the total water hardness in the river was carried out by means of mathematical modeling and statistical processing. The distribution laws of the total hardness are found separately for each month, which more accurately reflects the impact on the seasonality index. It is determined that the obtained empirical distribution functions of the indicator do not correspond to normal and log-normal distributions, but are quite accurately described by polynomials, which is confirmed by Kolmogorov’s goodness-of-fit criterion. The resulting distribution functions of the total hardness of water make it possible to predict the probabilities that the indicator will take certain values.
Dynamics of landslide processes within the Borisov Plateau of the East Manchurian Highlands
Authors: Kvashuk S V , Bogdanov A I , Trapeznikov V S 
Published: March 2023

Abstract
The activation of unfavorable exogenous processes within the Borisov Plateau of the East Manchurian Highlands (landslides, which are the leading ones in the area, karst processes, ravine formations, etc.) is determined by the specific geological structure of the territory, in which eluvial-deluvial formations of the Quaternary age participate in the upper part of the section. They intensively change their physical and mechanical properties when moistened in a typical coastal climate, which causes unfavorable processes and phenomena that lead to deformations of artificial structures and subgrade. The currently used standard and innovative anti-landslide protection structures do not give a positive effect due to the deep bedrock. Recommendations are given for the development of anti-landslide measures.