bluuebunny/crossref_metadata_2025_split huggingface dataset:
Macroscopic Zeno Effect in a Su–Schrieffer–Heeger Photonic Topological Insulator
Authors: Ivanov Sergey K. , Zhuravitskii Sergei A. , Skryabin Nikolay N. , Dyakonov Ivan V. , Kalinkin Alexander A. , Kulik Sergei P. , Kartashov Yaroslav V. , Konotop Vladimir V. , Zadkov Victor N. 
Published: September 2023

AbstractThe quantum Zeno effect refers to the slowdown of the decay of a quantum system due to frequent measurements. It has been extended beyond quantum systems, manifesting itself in such phenomena as the suppression of output beam decay by sufficiently strong absorption introduced in guiding optical systems. In this case, the phenomenon is termed as macroscopic Zeno effect. Here the observation of the macroscopic Zeno effect in a topological photonic system is reported. The phenomenon is based on the suppression of decay for only a subspace of edge modes that can propagate in the system and does not rely on the existence of exceptional points. By introducing controlled losses in one of the arms of a topological insulator comprising two closely positioned Su–Schrieffer–Heeger arrays, the macroscopic Zeno effect is demonstrated, which manifests itself in an increase of the transparency of the system with respect to the topological modes created at the interface between two arrays. The phenomenon remains robust against disorder in the non‐Hermitian topological regime. In contrast, coupling a topological array with a non‐topological one results in a monotonic decrease in output power with increasing absorption.
Strong Self‐Enhancement of Optical Nonlinearity in a Topological Insulator with Generation of Tamm State
Authors: Lu Hua , Shi Shouhao , Li Dikun , Hou Liping , Bo Shuwen , Zhao Jianxu , Xiao Fajun , Mao Dong , Zhao Jianlin 
Published: September 2023

AbstractAs new states of matter currently attracting broad attention in the optics field, topological insulators (TIs) present topologically‐protected conducting surface states surrounding insulating bulk and prominent third‐order optical nonlinearities in an ultrawide frequency range. Optical frequency conversion in TI nanofilms plays a crucial role in TI nonlinear optical functionalities, whose enhancement is in demand for high‐performance devices. Herein, an optical Tamm state is observed between the Sb2Te3 TI nanofilm and 1D photonic crystal (PC) with a self‐enhancement behavior of optical nonlinearity in the TI nanofilm. The experiments demonstrate that there exists a distinct reflection dip in the forbidden band of the PC, which is attributed to the appearance of Tamm state in the TI/PC structure. The wavelength of the TI‐based Tamm state possesses a nearly linear redshift with increasing TI film thickness. The measurements are in excellent agreement with simulation and theoretical calculations. Moreover, a strong third‐harmonic generation reinforcement of 30‐fold is experimentally observed in a 90 nm Sb2Te3 film, which stems from the field enhancement induced by the TI self‐excited Tamm state at the fundamental frequency. This work opens a new door for generation of optical Tamm states and applications of TIs in high‐efficiency nonlinear optical functionalities, especially frequency conversion.
Recent Progress of Organic–Inorganic Hybrid Perovskite Quantum Dots: Preparation, Optical Regulation, and Application in Light‐Emitting Diodes
Authors: Han Ying , Chang Xuerui , Cheng Xiaohua , Lin Yufan , Cui Bin‐Bin 
Published: September 2023

AbstractOrganic–inorganic hybrid perovskite quantum dots (QIHP‐QDs) have aroused widespread interest due to their superior photoelectric performance, quantum confinement effect, excellent photoelectric property, color‐tunability, and high photoluminescence quantum yield (PLQY) especially for QD‐based light‐emitting diodes (QLEDs). It is worth noting that a diverse selection of organic cations brings more adjustable optical properties to OIHP‐QDs compared with all‐inorganic perovskite QDs; thus the research on OIHP‐QDs has become a hit subject over recent years. This review summarizes the latest progress in synthesis strategy and optical property regulation of OIHP‐QDs in conjunction with the recent developments of their application in QLEDs. In addition, the current challenges limiting the applicability of QIHP‐QDs are discussed, and the development of OIHP‐QDs in the future is proposed.
Controllable Deformation Modulated Multi‐Functionality for Phase‐Gradient Metamaterials
Authors: Han Donghai , Li Wenkang , Liu Min , Chen Xiaoming , Zhang Liuyang , Chen Xuefeng 
Published: September 2023

AbstractTunable metamaterials offer versatile approaches to achieve the dynamic manipulation of electromagnetic waves with various dimensionality. Recently, mechanical approaches have been extensively employed to construct reconfigurable metamaterials with simple composition and superior mechanical characteristics. Mechanical modulation methods in phase‐gradient metamaterials are even more worthy of being investigated to facilitate valuable applications. Here, an in‐plane rotational deformation principle is proposed to assist the structural design of reconfigurable phase‐gradient metamaterials by integrating split ring resonators (SRRs) on the hyperelastic kirigami substrate. The orientations and split angles of SRRs are explored to manipulate the amplitudes and phases of cross‐polarized transmittance under x‐polarized incidence, respectively. The tensile strains dramatically modulate the amplitudes yet not the gradient phase. As proof‐of‐concept, a reconfigurable metalens is elaborately designed to realize tunable focus location and number by regulating the transmittance amplitudes of meta‐atoms via stretching the kirigami substrate. Furthermore, a holographic metamaterial is developed to perform dynamic hologram on the imaging plane under the strain 0% and 40%. The proposed mechanical deformation principle offers a promising platform for dynamic manipulation of the wavefront and may promote the conformal and flexible designs in certain cases and enlarge the potential applications of meta‐devices in imaging and information encryption.
Phonon‐Assisted Negative Thermal Quenching in a One‐Photon Up‐Conversion Phosphor for Thermometry
Authors: Wang Chao , Zhang Hao , Cai Yiyu , Wang Qingyuan , Zhou Bo , Xu Xuhui , Yu Xue 
Published: September 2023

AbstractThermal disturbance deteriorates the radiative transitions of up‐conversion phosphor, leading to decreased emission intensity at high operation temperatures. In this work, a thermal‐favored Yb3+/Nd3+ co‐doped KGaGeO4 up‐conversion phosphor with a negative thermal quenching behavior is explored. The as‐developed phosphor performs a one‐photon anti‐Stokes emission and exhibits a remarkable enhancement for the rise of ambient temperature reaching 653 K. It is demonstrated that the fascinating thermal behavior of the up‐conversion procedure is attributed to the enhanced energy transfer from the corresponding sensitizers to the activators by phonon assistance. Moreover, the microscopic dynamical process of phonon assistance and annihilation is revealed by introducing Er3+ ions as a probe. These results not only shed light on the phonon‐assisted strategy to build a highly efficient anti‐Stokes emission system but also open prospects for constructing phonon‐favored transitions with nonthermally coupled emissions to realize luminescence thermometry for their distinct thermal responsivity.
Impact of altruism preference difference on the optimal reward structure in online referral marketing
Authors: Jiang Fenfen , Zhu Shuting , Zhang Yuxiang 
Published: September 2023

AbstractSocial media have significantly boosted the prevalence of online referral marketing, through which firms use referral reward programs (RRPs) to promote their existing customers to disseminate or refer product information within social connections. We start with the idea that customer referral motives include firm‐offered rewards and altruistic motives to examine the optimal RRPs by developing nested Stackelberg game models among a firm, a rational (absolute) altruistic sender, and a recipient. The findings show that both product factors and customer factors influence the effectiveness of RRPs, and taking customers altruistic motives into account helps avoid reward waste and makes the optimal reward structure shift away from rewarding the sender. Furthermore, the optimal reward structure is closely related to the tie strength between the sender and the recipient and varies with altruism preference differences.
Fahr's disease linked to a novel mutation in MYORG variants manifesting as paroxysmal limb stiffness and dysarthria: Case report and literature review
Authors: Zhao Tianxue , Xu Shaokun , Liu Siyue , Xu Juan , Zhang Xianfeng , Zhan Yuhong 
Published: September 2023

AbstractBackgroundPrimary familial brain calcification (PFBC) is a rare hereditary neurodegenerative disorder associated with the MYORG gene; however, the clinical and radiological characteristics of MYORG‐PFBC remain unclear.MethodsWe present relevant medical data obtained from a patient affected by PFBC with a novel MYORG variant and conducted a mutational analysis of MYORG in her family members. We reviewed all reported PFBC cases with biallelic MYORG mutations until April 1, 2023, and summarized the associated clinical and radiological features and mutation sites.ResultsThe patient (22‐year‐old woman) exhibited paroxysmal limb stiffness and dysarthria for 3 years. Computed tomography revealed calcifications in the paraventricular white matter, basal ganglia, thalamus, and cerebellum. Whole‐exome sequencing revealed a novel homozygous frameshift variant (c.743delG: p.G248Afs*32) in exon 2 of the MYORG gene (NM_020702.5). To date, 62 families and 64 mutation sites have been reported. Among the reported biallelic MYORG mutations, 57% were homozygous and 43% were compound heterozygous. Individuals with biallelic MYORG mutations experience more severe brain calcification with approximately 100% clinical penetrance. Ten single heterozygous mutation sites are associated with significant brain calcifications.ConclusionAll patients with primary brain calcification, particularly younger patients without a family history of the disease, should be screened for MYORG mutations.
Yield uncertainty and strategic formation of supply chain networks
Authors: Amelkin Victor , Vohra Rakesh 
Published: September 2023

AbstractTo understand how supply uncertainty affects the structure of supply chain networks we consider a setting where retailers and suppliers must establish a costly relationship with each other prior too engaging in trade. Suppliers, with uncertain yield, announce wholesale prices, while retailers must decide which suppliers to link to based on their wholesale prices. Subsequently, retailers compete with each other in Cournot fashion to sell the acquired supply to consumers. We find that in equilibrium retailers concentrate their links among too few suppliers, that is, there is insufficient diversification of the supply base. We find that either reduction in supply variance or increase in mean supply, increases a supplier's profit. However, these two ways of improving service have qualitatively different effects on welfare: improvement of the expected yield by a supplier makes everyone better off, whereas change in the variance of the yield impacts system members differently.
Integration of in‐mine seismic and GPR surveys to gain advanced knowledge of Bushveld Complex orebodies
Authors: Onyebueke Emmanuel O. , Manzi Musa S. D. , Rapetsoa Moyagabo K. , Kgarume Thabang , Westgate Michael , Durrheim Raymond J. , Pienaar Michelle , Sihoyiya Mpofana , Mpofu Mvikeli , Schoor Michael Van , Kubeka Phumlani 
Published: September 2023

AbstractImproving the exploration of deep‐seated mineral deposits and assessing the stability of the mine pillars require that geophysical techniques are deployed in a fast and cost‐effective manner with minimal environmental impact. This research presents results from in‐mine reflection seismic experiments and a ground penetrating radar (GPR) survey conducted at the Maseve platinum mine, South Africa. The research aims to develop and implement methods to image platinum group metal (PGM) deposits and geological structures near mine tunnels and assess the stability of pillars. The seismic experiments were conducted using a sledgehammer source (10 lb), conventional cabled geophones (14 Hz), and a landstreamer with 4.5 Hz vertical component geophones. The GPR survey was conducted using a Noggin 500 GPR system with 500 MHz centre frequency. An image of the underlying orebody and geological structures down to 100 m from the mine tunnel floor (∼500 m below ground surface) was produced. We correlated the coherent reflections beneath the tunnel floor with a known Upper Group (UG2) PGM orebody. The final seismic section shows that the UG2 mineralisation is dissected by near‐vertical dykes, faults and fractures. These structures, faults in particular, are interpreted to have been active post‐mineralisation, implying that they may have contributed to the current complex geometry of the deposit. Four GPR profiles were collected around a stability pillar adjacent to the seismic lines. The radargram sections were processed to improve the signal‐to‐noise ratio (S/N). The results show different patterns of fracturing and stress‐induced structures. These fractures were shown to be sub‐vertical and, possibly, constitute complex micro‐structures within the pillar, which could compromise the pillar stability and integrity. The study demonstrates that in‐mine seismic and GPR surveys can be cost‐effective and valuable for mineral exploration.
Stability analysis of wall‐attached Bénard–Marangoni convection in a vertical magnetic field
Authors: Boeck Thomas 
Published: September 2023

AbstractThe threshold for the onset of thermocapillary flow in a planar liquid layer heated from below is increased by a vertical magnetic field when the liquid is a good electric conductor. The magnetic damping effect is reduced when the induced eddy currents are blocked by insulating side walls. Neutral conditions for this specific Bénard–Marangoni stability problem with a vertical field and side walls are obtained numerically for three‐dimensional perturbations assumed periodic in one horizontal direction. The domain is bounded by a free‐slip wall at the bottom, a free surface at the top and two free‐slip lateral walls in the other horizontal direction. Buoyancy forces and surface deformations are neglected and a constant heat flux is imposed on the free surface. Upon increasing the magnetic induction, the least stable modes become localized near the side walls and the convective threshold increases at a lower rate than for the least stable bulk mode.
On the lever law of Archimedes in the mechanics of bodies
Authors: Balke Herbert 
Published: September 2023

AbstractThe lever law of Archimedes is widely known since classical antiquity. It is used in many practical applications. Ample experience confirms its validity. Therefore, the lever law sometimes appears obvious or trivial. Its manifestation in the literature of physics ranges from common ignorance through rare marked appreciation to erroneous application of its mathematical content. Since medieval times, the groundbreaking findings of Galilei and Newton concerning the motion of bodies have shaped mechanics as an important branch of physics. On the contrary, it appears that the statics of antiquity with its essential element, the lever law, has gained less popularity despite its importance. In the following, this is demonstrated in terms of citations. For engineering mechanics, this implies to base the fundamental assumptions on the ideas of Archimedes and Newton as consistently as possible.
Continuous modelling of single layer 2D carbon nanostructures based on a modified Cauchy–Born rule
Authors: Ochs Julian , Wackerfuß Jens 
Published: September 2023

AbstractGraphene is the thinnest known structure. It consists of a single layer of carbon atoms and has unique mechanical properties. The carbon atoms form bonds with neighbouring atoms that can be described by interatomic potentials. A simulation of molecular mechanical processes can be performed by applying the formalism of the finite element method to the interatomic potentials. Neglecting local effects, a continuum formulation is an efficient alternative to a discrete model. The continuum formulation requires a connection between the discrete atomic lattice and the continuum. One way of doing this is to use the Cauchy–Born rule. This paper reviews the extensions of the Cauchy–Born rule, in particular, the exponential Cauchy–Born rule, and adds an alternative approach. It is shown that all contributions dealing with the exponential Cauchy–Born rule inevitably lead to shell models with Kirchhoff–Love kinematics. The approach presented here instead uses a shell model with Reissner–Mindlin kinematics, which has the major advantage of a much simpler mesh generation and a simpler application of the boundary condition.
Stability analysis of the Robust model order reduction algorithm for parametric linear dynamical systems
Authors: Ahuja Kapil , Singh Navneet Pratap , Choudhary Rajendra 
Published: September 2023

AbstractWe study stability of a interpolatory model order reduction (MOR) algorithm for first‐order and second‐order parametric linear dynamical systems, with respect to inexact linear solves. This analysis is easily extendible to other MOR algorithms for such systems. Besides deriving the two conditions for stability, and subsequent experimentation, our most novel contribution here is achieving a backward stable algorithm.
Properties and preparation of TiO2‐HAP@PVDF composite ultrafiltration membranes
Authors: Li Jian , Sun Jing , Ren Lulu , Lei Ting , Li Juan , Jin Jinbo , Luo Shanshan , Qin Shuhao , Gao Chengtao , Lei Ting 
Published: September 2023

AbstractThe non‐solvent induced phase separation technology was introduced to formulate titanium dioxide (TiO2)‐hydroxyapatite (HAP) composite modified polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes, and research was conducted to explore the effect on PVDF UF membrane performance exerted by different addition amounts (0–1.0 wt%) of TiO2‐HAP composite. The results indicated that when 0.3% TiO2‐HAP composite was added, the composite membranes had a through‐channel structure, with a uniform pore structure on the surface, so that they possessed a certainly raised pure water flux. Specifically, in contrast to the pure PVDF membrane, 0.3%‐TiO2‐HAP@PVDF UF membrane exhibited an incremented pure water flux by 59.09%. Besides, TiO2‐HAP@PVDF UF membranes had decreased rejection rate of bovine serum albumin (BSA) together with water contact angle to 58.62% and 70.17°, respectively, compared to the pure PVDF membrane (85.52% & 92.75°), showing good hydrophilicity. Several pure water flux tests on the composite UF membranes revealed that the flux tended to be stable after the 4th test. In summary, the addition of TiO2‐HAP composite is capable of efficiently ameliorating PVDF base membranes from the aspects of microstructure, hydrophilicity, antifouling properties, as well as stability, allowing a good application prospect in actual water treatment.Highlights
The HAP can solve the poor adsorption of TiO2.
The TiO2 can improves the interfacial adhesion between HAP and polymer.
The TiO2‐HAP composite with excellent stability, corrosion resistance and et al.
The TiO2‐HAP@PVDF UF membrane with anti‐pollution performance and stability.
Preparation and characterization of novel boron containing nanocomposites with neutron radiation shielding properties
Authors: Saltan Fehmi , Şirin Kamil , Aydin Selim , Yildirim Yeliz 
Published: September 2023

AbstractPVA/PEO/PVP‐B4C and PVA/PEO/PVP‐BN polymer nanocomposites were prepared using boron nitrite (BN), boron carbide (B4C), polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and polyethylene oxide (PEO). B4C and BN nanopowders were added to the mixture at three different percentages: 5%, 10%, and 20%. Thermal characterization was performed by differential scanning calorimetry, differential thermal analysis and thermogravimetry. Scanning electron microscopy, X‐ray photoelectron spectroscopy, and X‐ray diffraction were used for surface analysis and crystal structure characterization. The atomic distribution was determined by elemental analysis. Neutron shielding properties were performed at three different gamma peak areas, 1293.56 keV, 1097.33 keV, 416.86 keV, and calculated total macroscopic cross‐section ∑T and half‐value layer. The ∑T values were found to be in the range of 7.99–14.37 for all synthesized composites. B4C‐doped composites show higher protection efficiency against slow thermal neutrons than BN‐doped samples.Highlights
Poly(vinyl alcohol)/poly(ethylene oxide)/polyvinylpyrrolidone composites containing boron nanoparticles are flexible and workable.
Nanocomposites were prepared with a simple, cheap, and fast method.
Prepared boron nanocomposites exhibit slow thermal neutron stopping even at 3 mm thickness.
PVA90/PEO5/PVP5‐BN and PVA90/PEO5/PVP5‐B4C composites are good candidates for demanding military applications such as vehicle and body armor.
Physico‐mechanical and thermo‐mechanical analysis of zinc borate filled glass fiber reinforced polymer composites
Authors: Chellamuthu K. , Vasanthanathan A. 
Published: September 2023

AbstractThe potential benefits of using zinc borate powder as filler material in the production of glass fiber‐reinforced composites were explored in this study. The epoxy matrix was filled with zinc borate powder at 5%, 10%, and 15% by weight, as part of the hand lay‐up approach followed by a compression molding process. Ultrasonication was used to mix the epoxy resin with zinc borate fillers. Both the elemental composition and morphological characteristics were studied using a scanning electron microscope and energy‐dispersive X‐ray analysis. The composite's density, tensile behavior, flexural behavior, impact resistance, and hardness were all measured experimentally. The potential incorporation of zinc borate particles resulted in a modest reduction in the void contents, in addition to enhancing the interfacial bonding in glass fiber‐reinforced composites as also a significant improvement in both the mechanical and thermal properties of the hybrid composites produced. The 10 wt.% zinc borate‐ filled glass fiber‐reinforced composites exhibited a significant rise in both ultimate tensile strength (227 MPa), ultimate compressive strength (239 MPa), and ultimate flexural strength (406 MPa) compared to the unfilled counterpart. The performance of the laminated composites was greatly improved by adding zinc borate powder particles to the matrix.Highlights
In the present work glass fiber was reinforced with zinc borate to explore the morphological, mechanical, and thermal properties.
Ultrasonication was used to mix the epoxy resin and zinc borate fillers and the composites were manufactured by compression molding process.
The addition of zinc borate resulted in an increase in tensile strength, flexural strength, and compressive strength.
The thermal stability of the composites was increased by the addition of zinc borate to the glass matrix.
The good bonding between the matrix and fiber resulted in improvements in various properties.