bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of a discrete memristive chaotic map: fractional-order memory, dynamics and application
Authors: Wang Huihai , Xin Zuyi , He Shaobo , Sun Kehui 
Published: July 2024

Abstract
In this paper, a discrete fracmemristor (DFM) model is derived based on the Caputo difference, and a new fractional-order chaotic map is designed. Dynamics of the proposed map is investigated in detail by means of Lyapunov exponent spectra, bifurcation diagrams, PE complexity and multistability analyses. Compared with the coupled discrete integer-order memristor (DIM), the map coupled with the DFM products richer dynamics, including larger attractor distribution, fewer numerically periodic windows, and higher complexity. Besides, the order becomes additional bifurcation parameter. Finally, the proposed map is implemented on Field-Programmable Gate Array (FPGA) platform, and applied in a pseudorandom number generator (PRNG), which further demonstrates its application value.
The Symbiotic X-Ray Binary IGR J16194-2810: A Window on the Future Evolution of Wide Neutron Star Binaries From Gaia
Authors: Nagarajan Pranav , El-Badry Kareem , Lam Casey , Reggiani Henrique 
Published: July 2024

Abstract
We present optical follow-up of IGR J16194-2810, a hard X-ray source discovered by the INTEGRAL mission. The optical counterpart is a ∼500 L
⊙ red giant at a distance of 2.1 kpc. We measured 17 radial velocities (RVs) of the giant over a period of 271 days. Fitting these RVs with a Keplerian model, we find an orbital period of P
orb = 192.73 ± 0.01 days and a companion mass function f(M
2) = 0.365 ± 0.003 M
⊙. We detect ellipsoidal variability with the same period in optical light curves from the ASAS-SN survey. Joint fitting of the RVs, light curves, and the broadband spectral energy distribution allows us to robustly constrain the masses of both components. We find a giant mass of

M

⋆

=

0.99

−
0.03

+
0.02

M

⊙

and a companion mass of

M

2

=

1.23

−
0.03

+
0.05

M

⊙

, implying that the companion is a neutron star (NS). We recover a 4.06 hr period in the system’s TESS light curve, which we tentatively associate with the NS spin period. The giant does not yet fill its Roche lobe, suggesting that current mass transfer is primarily via winds. Modules for Experiments in Stellar Astrophysics evolutionary models predict that the giant will overflow its Roche lobe in 5–10 Myr, eventually forming a recycled pulsar + white dwarf binary with a ∼900 days period. IGR J16194-2810 provides a window on the future evolution of wide NS + main sequence binaries recently discovered via Gaia astrometry. As with those systems, the binary’s formation history is uncertain. Before the formation of the NS, it likely survived a common envelope episode with a donor-to-accretor mass ratio ≳10 and emerged in a wide orbit. The NS likely formed with a weak kick (v
kick ≲ 50 km s−1), as stronger kicks would have disrupted the orbit.
Investigating the level structure of 206Rn: evolution from seniority regime to collective dynamics*
Authors: Guo 郭 Rui 瑞 , Zhu 竺 Li-Hua 礼华 , Lu 陆 Jing-Bin 景彬 , Fu 傅 Guan-Jian 冠健 , Wang 王 Meng 萌 , Sun 孙 Bao-Hua 保华 , Zhang 张 Gao-Long 高龙 , Ren 任 Zhen 臻 , Wu 吴 Yi-Heng 义恒 , Zheng 郑 Yun 云 , He 贺 Chuang-Ye 创业 , Wang 汪 Jin-Long 金龙 , Wu 吴 Xiao-Guang 晓光 , Yao 姚 Shun-He 顺和 
Published: July 2024

Abstract
Excited states of

have been examined via the

(

, 5n)

fusion reaction at a beam energy of 78 MeV. A number of transitions and levels are identified by the γ-γ coincidence measurement, further enriching the level scheme of

. The full configuration shell model and nucleon-pair approximation (NPA) were utilized to investigate the single-particle configurations and seniority structures in

. The results of these two calculations suggest that

and

states exhibit only a 50% component of a seniority-two state associated with a broken neutron pair. The collectivity of these two states primarily arises from configuration mixing due to residual proton-neutron interactions. Furthermore,

and

states are predominantly characterized by a seniority-two state marked by a broken proton pair.
Effects of torsion charge on optical appearance and additional photon rings of an asymmetric thin-shell wormhole
Authors: Jing 景 Qi-Qin 琪钦 , He 何 Ke-Jian 柯腱 , Luo 罗 Zhi 智 
Published: July 2024

Abstract
In this paper, we study the optical properties of asymmetric thin-shell wormholes (ATWs) under torsion charge. Utilizing the cut-and-paste method developed by Visser, we construct these wormholes and determine their key physical properties, such as the radius of the photon sphere and critical impact parameters, under different torsion charges. Furthermore, we investigate the effective potential and behavior of photon motion within the wormhole spacetime, identifying a relationship between photon trajectories and impact parameters. The study focuses on scenarios where thin accretion disks act as the primary light source. It reveals that the optical features of ATWs under torsion charge significantly differ from those of black holes (BHs). Notably, an increase in torsion charge leads to a reduction in the sizes of both extra photon rings and lensing bands, which serve as important markers for distinguishing and characterizing ATW spacetimes from those of BHs.
Heat currents in qubit systems
Authors: Fogedby Hans C 
Published: July 2024

Abstract
There is a current interest in quantum thermodynamics in the context of open quantum systems. An important issue is the consistency of quantum thermodynamics, in particular the second law of thermodynamics, i.e. the flow of heat from a hot reservoir to a cold reservoir. Here recent emphasis has been on composite system and in particular the issue regarding the application of local or global master equations. In order to contribute to this discussion we discuss two cases, namely as an example a single qubit and as a simple composite system two coupled qubits driven by two heat reservoirs at different temperatures, respectively. Applying a global Lindblad master equation approach we present explicit expressions for the heat currents in agreement with the second law of thermodynamics. The analysis is carried out in the Born–Markov approximation. We also discuss issues regarding the possible presence of coherences in the steady state.
Effect of different forms of calcium sulfate on the properties of cement
Authors: Staněk T , Szklorzová H , Kubátová D , Rybová A 
Published: July 2024

Abstract
In our conditions, mainly flue gas desulfurization gypsum (FGD gypsum) is used as a cement setting regulator. When cement is ground, it decomposes into hemihydrate or even anhydrite as the temperature rises. The ground cement is placed in a storage silo where the increased temperature is compounded by increased pressure and the cement properties are affected by the moisture released and by the change in the phase composition of the setting regulator. Under laboratory conditions, hemihydrate and anhydrite II and III were prepared from one type of FGD gypsum. Their purity was monitored by X-ray diffraction analysis and differential thermal analysis. The prepared calcium sulfates were used in different proportions as setting regulators in the laboratory preparation of Portland cements. Technological properties such as strength and solidification were then determined for cements. The hydration process was monitored by the calorimetric method.
Effect of thermo-oxidative ageing on changes of physical-mechanical parameters of aramid and UHMWPE laminates
Authors: Beránková Irena , Mikulíková Regina , Křest’an Jan 
Published: July 2024

Abstract
This work is focused on monitoring of the effect of thermo-oxidative ageing of laminates on their physical-mechanical parameters, such as tensile strength, tensile modulus of elasticity, flexural strength, flexural modulus of elasticity and hardness. Changes of mentioned parameters were observed on two types of laminates based on aramid and two types based on UHMWPE (Ultra High Molecular Weight Polyethylene). The laminates were exposed to the accelerated thermo-oxidative ageing under higher temperature in the presence of atmospheric oxygen. The aim of the work was to find the physical-mechanical parameter with the greatest changes caused by thermo-oxidative ageing. This parameter was consequently chosen for the prediction of laminates lifetime. From the obtained results, it can be seen that aramid laminates show a significantly higher temperature resistance compared to UHWPE-based laminates.
Impedance Spectroscopy – comparison of experimental ceramic results with model parameters
Authors: Kusak I , Lunak M , Dvorak R , Nekorancova A , Mizerova C , Rovnanik P 
Published: July 2024

Abstract
Impedance spectroscopy is a non-destructive test method belonging to the group of electrical engineering measurements. The method is suitable for monitoring the quality of building materials even with low conductivity. Although the method focuses on the intrinsic conductivity of systems, most IS techniques, including data analysis methods, conceive of the material in terms of a lossy dielectric. In selecting the material for testing with the IS method, an attempt was made to bring the IS capabilities as close as possible to practical, real-world materials. This paper is devoted to a comparison of the impedance characteristics of ceramics with three types of dielectric models that are described in theory or referenced in the literature. The ceramic samples were fabricated using different material additions, such as bentonite, phosphoric acid, or sodium water glass. Experimental curves of the loss factor versus frequency for all samples are described and then approximations of selected samples are shown successively for all three models considered. Experimental results were obtained from more than 50 points in each characterization. Measurements were performed for frequencies from 40 Hz to 1 MHz.
Examples of dynamic test procedures for steel fibre reinforced concrete
Authors: Šperl M , Gajdoš L’ , Drdlová M , Řídký R 
Published: July 2024

Abstract
The aim of this work is to present some examples of experimental tests, which can be usefull for characterizing the resistance to failure of special steel fibre reinforced concrete – SFRC, intended especially for security use in the framework of ballistic and explosion protection. The first type of the tests was the strain gauge - based characterization of the dynamic response of the SFRC concrete block under ballistic loading. The tests were aimed at measuring the deformation response of a concrete specimen of 500 x 500 x 105 mm in dimensions upon the impact of a projectile. The tests were used to support the development and verification of numerical simulation models. For numerical simulations 3D models of individual projectiles were developed. Four T-type strain gauges were glued according to the geometric scheme on the opposite side of a specimen, i.e. on the side behind the impact of the projectile, and they measured the deflection of the plate after the impact of the projectile. The strain response records obtained from the strain gauges were subsequently used for numerical analyses by the use of the LS-DYNA software. The average maximum deflection of the plate at the impact of the projectile was characterized by the strain 400 µm/m. The second type of the tests was concerned with the method of measuring the quasi-dynamic tensile strength of special concrete specimens using an instrumented Charpy tester. The results compare both the breaking energy and the maximum force achieved for hobby concrete (HB) and hobby concrete with wires (HBD) specimens. These were pilot tests to develop the most suitable testing method. For the HB and HBD specimens the maximum force in the tests was found to be 55 N vs. 600 N, and the breaking energy to be 0.4 J vs. 1.3 J.
Effect of silages on concrete and process of its corrosion in the course of time
Authors: Chromková Ivana , Čechmánek René , Krejčí Kotlánová Michaela 
Published: July 2024

Abstract
Silages are important juicy bulky feedstuff, that has irreplaceable role in nutrition of farm animals – cattle, pigs and horses. The silages are made of a fresh plant mass (e.g. corn, alfalfa, rape, clover or grass), that is in a chopped form in an exactly given way ensiled, i.e. in a tamped or pressed form without access of air subjected to a fermentation process. Within this process acid juices are created and enter into a construction of containers aimed for the ensilage process. These containers are mainly from a reinforced concrete. Influence of the silage on the concrete is a difficult process and it depends on several factors. From the point of view of durability/resistance to the silage effect, a concrete composition is a significant factor, the other factors are silage properties as well as time of a contact of the concrete with the silage. In this paper we describe findings on a state of 3 concrete compositions, which were repeatedly subjected to a corn silage for 3 years. In a 1-year interval, an effect of the silages on physico-mechanical properties of the concrete (e.g. strength, absorptivity, porosity) was observed. The highest resistance to effect of the silages in the course of time was proven for the concrete with a higher content of Portland cement.
Universal optimal design in the vertebrate limb pattern and lessons for bioinspired design
Authors: Burgess Stuart 
Published: July 2024

Abstract
This paper broadly summarizes the variation of design features found in vertebrate limbs and analyses the resultant versatility and multifunctionality in order to make recommendations for bioinspired robotics. The vertebrate limb pattern (e.g. shoulder, elbow, wrist and digits) has been proven to be very successful in many different applications in the animal kingdom. However, the actual level of optimality of the limb for each animal application is not clear because for some cases (e.g. whale flippers and bird wings), the basic skeletal layout is assumed to be highly constrained by evolutionary ancestry. This paper addresses this important and fundamental question of optimality by analysing six limbs with contrasting functions: human arm, whale flipper, bird wing, human leg, feline hindlimb and frog hindlimb. A central finding of this study is that the vertebrate limb pattern is highly versatile and optimal not just for arms and legs but also for flippers and wings. One key design feature of the vertebrate limb pattern is that of networks of segmented bones that enable smooth morphing of shapes as well as multifunctioning structures. Another key design feature is that of linkage mechanisms that fine-tune motions and mechanical advantage. A total of 52 biomechanical design features of the vertebrate limb are identified and tabulated for these applications. These tables can be a helpful reference for designers of bioinspired robotic and prosthetic limbs. The vertebrate limb has significant potential for the bioinspired design of robotic and prosthetic limbs, especially because of progress in the development of soft actuators.
An assessment of recent peat forest disturbances and their drivers in the Cuvette Centrale, Africa
Authors: Nesha Karimon , Herold Martin , Reiche Johannes , Masolele Robert N , Hergoualc’h Kristell , Swails Erin , Murdiyarso Daniel , Ewango Corneille E N 
Published: July 2024

Abstract
The largest tropical peatland complex in the Cuvette Centrale is marked by persistent knowledge gaps. We assessed recent peat forest disturbances and their direct drivers from 2019 to 2021 in Cuvette Centrale, spanning the Republic of Congo (ROC) and the Democratic Republic of Congo (DRC). Utilizing peatland maps and Radar for Detecting Deforestation alert data, we analyzed spatial and temporal patterns of disturbances. Further, we examined 2267 randomly sampled peat forest disturbance events through visual interpretation of monthly Planet and Sentinel 2A data to identify direct drivers. Our findings revealed that between 2019 and 2021, about 91% of disturbances occurred in DRC, with hotspots concentrated in the northwest Sud-Ubangi district. Disturbances predominantly followed a sharp seasonal pattern, recurring during the first half of each year with temporal hotspots emerging between February and May, closely associated with smallholder agriculture activities. Smallholder agriculture accounted for over 88% of disturbances in Cuvette Centrale, representing a leading role both in ROC (∼77%) and DRC (∼89%). While small-scale logging contributed 7% to the disturbances in the region, it constituted an important driver (18%) in the ROC. Other drivers included floods, roads, and settlements. Approximately 77% of disturbances occurred outside managed forest concessions in Cuvette Centrale, with 40% extending into protected areas. About 90% of disturbances were concentrated within 1 km of peat forest edges and ∼76% of the disturbances occurred within 5 km of road or river networks. The insights underscore the crucial need for effective peat forest conservation strategies in Cuvette Centrale and can inform national policies targeting peatland protection, aligning with commitments in the Brazzaville Declaration and the Paris Agreement. Further, our findings on direct driver assessment could serve as a reference dataset for machine learning models to automate the visual interpretation and upscale the assessment across the entire region.
Ocean feedback on 50–80-day boreal winter intraseasonal oscillation in the Indian Ocean: comparison of atmospheric and coupled CESM2 simulations
Authors: Liang Yun , Xia Ruixue , Du Yan 
Published: July 2024

Abstract
The role of sea surface temperature (SST) variability in the boreal winter intraseasonal oscillation (ISO) over the tropical Indian Ocean (TIO) is investigated in this study using the Community Earth System Model Version 2. An atmospheric general coupled model (AGCM) run forced by daily SSTs derived from a parallel coupled circulation model (CGCM) run is compared with reanalysis and the original coupled simulation. The comparison of atmospheric-coupled GCMs reveals the frequency and spatial tendency of the SST effect on the atmospheric ISO. The 50–80 d component of the ISO over the TIO is significantly intensified in the AGCM run. The SST-to-atmosphere effect is most prominent over the southeastern TIO. In the AGCM run, low-level wind anomalies related to SST appear west of the ISO convection center, contrasting with the previous findings that the SST effect appears east of the convection center.
Simulation of mode transitions in capacitively coupled Ar/O2 plasmas
Authors: LIU 刘 Xiangmei 相梅 , ZHANG 张 Shuren 树人 , ZHAO 赵 Shuxia 书霞 , LI 李 Hongying 洪影 , REN 任 Xiaohui 晓辉 
Published: July 2024

Abstract
In this work, the effects of the frequency, pressure, gas composition, and secondary-electron emission coefficient on the discharge mode in capacitively coupled Ar/O2 plasmas were carefully studied through simulations. Three discharge modes, i.e., α, γ, and drift-ambipolar (DA), were considered in this study. The results show that a mode transition from the γ-DA hybrid mode dominated by the γ mode to the DA-α hybrid mode dominated by the DA mode is induced by increasing the frequency from 100 kHz to 40 MHz. Furthermore, the electron temperature decreases with increasing frequency, while the plasma density first decreases and then increases. It was found that the electronegativity increases slightly with increasing pressure in the low-frequency region, and it increases notably with increasing pressure in the high-frequency region. It was also observed that the frequency corresponding to the mode transition from γ to DA decreased when the secondary-electron emission coefficient was decreased. Finally, it was found that increasing the oxygen content weakens the γ mode and enhances the DA mode. More importantly, the density of oxygen atoms and ozone will increase greatly with increasing oxygen content, which is of great significance for industrial applications.
Impact of voluntary environmental regulation on green innovation from the perspective of enterprise life cycle: evidence from China
Authors: Ma Hedan , Dong Yuxin , Zhou Mingming , Fang Na 
Published: July 2024

Abstract
From the perspective of enterprise life cycle, the impact of voluntary environmental regulation on enterprise green innovation was examined in this study based on the data of manufacturing enterprises listed on China’s A-share market from 2012 to 2021. The results indicate that: (1) voluntary environmental regulation has a significant positive impact on enterprise green innovation as a whole. (2) Among all stages of enterprise life cycle, voluntary environmental regulation has a significant impact on enterprise green innovation in the growth and maturity stages, but has a relatively small impact on enterprise green innovation in the formation and decline stages. (3) The results of a segmented sample study on this basis show that voluntary environmental regulation has heterogeneity in property rights and factor density in promoting enterprise green innovation. It significantly promotes green innovation by state-owned enterprises in the maturity stage, green innovation by non-state-owned enterprises in the maturity and decline stages, and green innovation by capital and technology intensive manufacturing enterprises, but have no significant impact on other types of enterprises. These research conclusions are expected to provide decision-making reference for improving the voluntary environmental regulation system and promoting the level of enterprise green innovation.
From Jihad to Politics
Authors: Drevon Jerome 
Published: July 2024

Abstract
The Syrian regime unleashed unprecedented violence to suppress large-scale non-violent protests amid the Arab uprisings. Hundreds of armed groups formed throughout the country to defend the protesters and fight back. However, in contrast to other conflicts previously dominated by al-Qaeda and Islamic State, the two largest Syrian Jihadi groups, Ahrar al-Sham and then Jabhat al-Nusra, rejected global jihad and began to cultivate new ties with the population, other armed opposition groups, and even foreign states. This strategic shift is a response to the Jihadi paradox--a realization that while Jihadis excel at leading insurgencies, they fail to achieve political victories. In From Jihad to Politics, Jerome Drevon offers an examination of the Syrian armed opposition, tracing the emergence of Jihadi groups in the conflict, their dominance, and their political transformation. Drawing upon field research and interviews with Syrian insurgents in northwestern Syria and Turkey, Drevon demonstrates how the context of a local conflict can shape armed groups' behaviour in unexpected ways. Further, he marshals unique evidence from the Arab world's most intense conflict to explain why the trajectory of the transnational Jihadi movement has altered course in recent years.
Mandatory Disclosures and Substantive Consumer Rights
Authors: Pflücke Felix 
Published: July 2024

Abstract
Chapter 4 focuses on the rights consumers derive from the national rules implementing the minimum harmonization E-Commerce Directive and maximum harmonization Consumer Rights Directive. The part concerning the E-Commerce Directive examines whether the Member States decide to surpass the Directive’s level of protection. The part of the chapter exploring legal duties in the Consumer Rights Directive focuses solely on the EU level because the Directive’s standard does not permit Member States to deviate. From an evidence-driven law and policy perspective and alignment with consumer theories, the chapter illustrates a growing trend in both the utilization and enhancement of evidence, transitioning from the E-Commerce Directive to the Consumer Rights Directive.