bluuebunny/crossref_metadata_2025_split huggingface dataset:
LIVS: a tightly coupled LiDAR, IMU, and camera-based SLAM system under scene degradation
Authors: Cheng Guangtao , Li Peiqing , Li Qipeng , Wang Debao , Li Zhuoran , Wang Zhiwei 
Published: October 2024

Abstract
In increasingly complex environments, single-sensor-based SLAM systems face scene degradation problems such as strong light, dynamic obstacle interference, and lack of structural features in the environment, which severely constrain the localization accuracy and mapping effectiveness of SLAM systems. To address this problem, this paper proposes a tightly coupled laser-IMU-visual SLAM system (LIVS) based on factor graph optimization. LIVS consists of two subsystems: the laser inertial system (LIS) and the visual inertial system (VIS). The pose estimation of the LIS can provide an initialization for the VIS; LiDAR suffers scene degradation in environments lacking structural features, while the VIS provides better constraints for Lidar in this environment. Firstly, a method of selecting keyframes based on ORB features and the relative motion of the mobile robot is proposed as a means of improving the positioning accuracy and tracking ability of the system in the case of strenuous motion, and a strategy of local sliding window optimization is adopted to effectively improve the real-time performance and robustness of the system. Meanwhile, in order to further improve the global map consistency and positioning accuracy, a hybrid closed-loop detection method based on laser and vision is proposed, which utilizes the geometrical features of laser and the image features of vision to accomplish the hybrid closed-loop detection. Secondly, the laser inertia factor, IMU pre-integration factor, vision inertia factor, and closed-loop factor are globally optimized in a factor map framework to achieve accurate estimation of the robot pose. Finally, this paper presents experimental evaluations on both public and homemade datasets and compares the performance of the proposed algorithm with that of other algorithms. Experimental results show that the algorithm in this paper exhibits better performance in both localization accuracy and mapping effectiveness.
Firing patterns transitions and resonance effects of the extended Hindmarsh-Rose neural model with Gaussian noise and transcranial magneto-acousto-electrical stimulation
Authors: Fu Yan , Wang Guowei 
Published: October 2024

Abstract
Considering the fact that the typical three-variable Hindmarsh-Rose(HR) neural model has limitations in describing the complex non-linear features and precise behavior patterns of neuron, the influences of transcranial magneto-acousto-electrical stimulation(TMAES) on firing patterns and resonance effects are analyzed based on an extended HR neural model in this paper. Obtained results show that TMAES can induce transitions in the firing patterns of extended HR neuron, such as spiking and multi-periodic bursting state, etc If appropriate parameters are selected, the multimodal discharge modes can also be observed. Coefficient of variation is calculated to further investigate the effect of TMAES and Gaussian white noise on the firing rhythm of extended HR neuron, and relevant results indicate that TMAES can induce coherent resonance phenomena in HR neuronal systems similar to the effects of Gaussian white noise, which reveals a new mechanism of coherent resonance induced by TMAES. Further more, TMAES can also regulate coefficient of variation to exhibit anti-coherent resonance and multiple anti-coherent resonance structures, exhibiting richer regulatory functions than Gaussian white noise in regulating neuronal firing rhythm. This study seeks to enhance the understanding of the processes that influence the firing patterns and coherence degree of neuron under TMAES in neuroses or psychoses.
Study of integral type implicit multi term fractional delay differential equation with multi strip conditions
Authors: ur Rahman Ghaus , Naz Humaira , Alrabaiah Hussam , Gómez-Aguilar J F 
Published: October 2024

Abstract
This paper is concerned with the existence and functional stability of solutions to some class of integral-type implicit fractional-order differential equations using multi-strip subsidiary conditions. Contrary to the single-term fractional-order differential operators, in the present study, multi-term operators are involved, and the effect of the past time by a proportional delay is taken into consideration. The problem under investigation is converted into a fixed-point problem. The results are based on Krasnoselskii’s fixed-point theorem, which establishes the existence of the solution, and Banach’s, which establishes its uniqueness. The Ulam-Hyers type stability analysis is used in the study of the behavior of the solutions under perturbations. An example is given at the end to confirm the reliability of the results obtained.
Probing the structural, mechanical, electro-magnetic, thermodynamic and thermoelectric properties of inner-transition based RaXO3 (X: Pr and U) cubic perovskites via first principle calculations
Authors: Gautam Sakshi , Gupta Dinesh C 
Published: October 2024

Abstract
Here, we present ab-initio calculations of the structural, mechanical, electronic, magnetic, thermodynamic and thermoelectric properties of two radium-based perovskites by using density functional theory. These compounds are cubic in nature. Computation of tolerance factor, structural optimization by using the equation of state assures the stability of the materials. Further, we have checked the mechanical stability of the materials by computing the different mechanical parameters. The observed data of B/G and Cauchy pressure for the present materials reveals the ductile nature. The spin polarized band structures and density of states illustrate the half-metallic nature of these materials with the band gap of (3.74 and 4.80) eV in spin down channel for RaPrO3 and RaUO3 alloys respectively. The total magnetic moments calculated via GGA and mBJ approximations were found to be integral in nature (1 and 2) μB, for RaPrO3 and RaUO3 alloys respectively which also is an indication of the half-metallic character of these materials. The effect of temperature and pressure on the different thermodynamic properties like the specific heat capacity, thermal expansion and Gruneisen parameter were studied using the quasi-harmonic Debye model. Finally, we have speculated the temperature dependent thermoelectric properties in terms of Seebeck coefficient, electrical conductivity, thermal conductivity and power factor. The summed -up properties suggest the applications of these materials in thermoelectrics, spintronics and thermoelectric generators outlooks.
A hybrid protocol by a single measurement in noisy environment with simulation
Authors: Mandal Manoj Kumar , Metwally Nasser , Choudhury Binayak S 
Published: October 2024

Abstract
In this paper, a hybrid protocol for teleportation and remote state preparation of an unknown and a known qubits is introduced. The suggested protocol depends on only a single measurement and a single entangled channel which makes the protocol operationally convenient. The protocol has been implemented on the IBM platform. Moreover, a quantum circuit is designed to generate the quantum channel between the sender and the receivers. The fidelity of the receiver’s channel is investigated in the presence of different types of noises which are Bit-flip noise, Phase-flip noise, Bit-phase-flip noise, Depolarizing noise and Two-Pauli noise. It is shown that the fidelities decrease gradually with the strength of the noise.
Optical, dielectric and electrical properties of Ba/Sb nanosheets designed for electro-optical application
Authors: Qasrawi A F , Najar Sarah Hakam , Elayyat Shadia M S 
Published: October 2024

Abstract
Herein, stacked nanosheets of barium and antimony are fabricated using a vacuum deposition technique under a vacuum pressure of 10−5 mbar onto cleaned glass substrates. The Zintl Ba/Sb nanosheets exhibit an amorphous nature of growth with equal atomic contents. Notably, they present interesting properties such as low average roughness, high light transmittance and absorption, and low reflectance. Two optical transitions within energy bands with values of 3.40 eV and 0.75 eV are determined for these stacked nanosheets. Additionally, Ba/Sb nanosheets displayed dielectric lens and optical filter characteristics with high optical conductivity exceeding 5.0 (Ωcm)−1, 20 (Ωcm)−1, and 100 (Ωcm)−1 in the infrared, visible, and ultraviolet ranges of light, respectively. The optical conductivity parameters, including the free charge carrier density, drift mobility, and plasmon frequency, exhibit values in the ranges of 1.3–25×1019 cm−3, 3.53–9.41 cm2/versus, and 3.92–17.18 GHz, respectively. Moreover, Ba/Sb nanosheets display characteristics of terahertz band filters, demonstrating terahertz cutoff frequency values of 18–100 THz in the incident photon energy range of 1.13–3.64 eV. On the other hand, temperature-dependent electrical conductivity measurements on these stacked nanosheets reveal the domination of two impurity levels centered at 136 meV and 500 meV, with one being dominant below and the other above 380 K, respectively. The features of the Ba/Sb nanosheets reported here highlight their potential as optical filters, surface plasmon resonators, and terahertz band filters.
On the exploration of new solitary wave solutions for the classical integrable Kuralay-IIA system of equations
Authors: Okposo Newton I , K Raghavendar , Gómez-Agullar J F , Khan Naveed , Jonathan Abel M 
Published: October 2024

Abstract
In this paper, we derive various new optical soliton solutions for the coupled Kuralay-IIA system of equations using an innovative solution approach known as the ϕ
6 − model expansion technique. This solution methodology employs a traveling wave transformation to reduce the considered problem into an easily solvable higher-order ordinary differential equation. Unlike other existing related methods, this solution approach adopted here allows us to extract a rich list of diverse exact soliton solutions for the considered problem. The obtained solutions incorporate the Jacobi elliptic functions which are shown to degenerate into trigonometric and hyperbolic function solutions. These solutions exhibit distinct wave structures consisting of dark, bright, rational, periodic, singular and mixed optical solitons profiles. In exploring the impact of spatial and temporal variables on the wave patterns of the considered model, physical structures of some of the obtained solitons solutions are characterized through 3D, contour and 2D wave profiles for selected parameter values. This not only ensures the validity of the solutions as well as the constraints arising from the solution technique but also offers researchers a deeper understanding of the properties of the considered problem. The outcomes here demonstrate the applicability, versatility and efficiency of the considered solution approach for deriving diverse new soliton solutions for even more complex systems of nonlinear evolution equations.
Fabricating 3D Si nanostructure via a novel Ga+ implantation enabled maskless dry etching process
Authors: Shi Huimin , Wang Zilong , Chen Haicheng , Hong Yuhao , Liu Gaowa , Zhu Xupeng , Wang Tao , Wang Yasi 
Published: October 2024

Abstract
Three-dimensional (3D) nanostructure is the key to the miniaturization of nonlinear photonic and electronic devices. Because of the great demand on the ultra-small nanostructures, the novel nanofabrication technologies with flexible 3D silicon (Si) fabrication capability are of great importance. Herein, by combining Ga+ FIB implantation and ICP dry etching processes, we proposed a novel Ga+ FIB implantation assisted maskless dry etching technology for direct fabrication of 3D Si nanostructures. We found that the implanted Ga+ induced amorphization layer in Si substrate acts as the ‘quasi-mask’ during the ICP dry etching process. The increase of Ga+ concentration in amorphization layer of Si substrate improves the etching resistance of the area. Moreover, enabled by high resolution and flexibility of FIB, the proposed technology is capable of directly fabricating various 3D Si nanostructures in a simple way, such as 3D nanoscale artificial bowtie arrays with sub-10 nm gaps, multi-scale 3D Si nanostructures with arbitrary patterns. More importantly, the proposed technology is compatible to current semiconductor manufacturing process. Benefiting by the advantages of simplicity and high efficiency, the proposed maskless dry etching process promises great application potential in the fields of nonlinear photonics and micro-electronics.
Flexible UWB circular polarized six-port MIMO antenna for internet of medical things-based smart belts
Authors: Geyikoglu M Dilruba 
Published: October 2024

Abstract
The present study presents a six-port multiple-input and multiple-output (MIMO) antenna developed to meet the diversity requirements of body-centered communication in the Internet of Medical Things (IoMT)-based smart belts. The proposed antenna consists of six identical elements having a coplanar waveguide (CPW) structure. The antenna has a small profile area of 36 × 42 mm and a height of 0.76 mm with the careful placement of its elements. There are circular patches and a CPW feed structure at the center of the antenna. The ground-patch distance was set intuitively by considering the mutual coupling effect. The effect of the current distribution was increased, and a wide operating range was achieved by adding symmetrical circular slots to soil surfaces. As a proof of configuration, the simulation results are supported by a mesh network equivalent circuit model. The proposed antenna has a bandwidth of 177% in the 0.9–15 GHz frequency range at −6 dB reference. Moreover, it also has an omnidirectional radiation pattern and circular polarization. The peak gain value was found to be 7.8 dBi and the efficiency value to be approximately 90%. ECC, DG, TARC, and CCL parameter measurements were analyzed for performance evaluation of MIMO antennas. In addition, bending tests are also examined. The specific absorption rate (SAR) of the proposed antenna in tissues is evaluated by using infrared thermography. The results indicate that the SAR values are lower than international standards. The antenna design is specifically optimized to exhibit robust behavior when worn by an individual.
The impact of charge carrier dynamics on the outdoor performance of cesium-lead-halide perovskite photovoltaics
Authors: Meheretu Getnet M , Yihunie Moges T , Wubetu Getasew A 
Published: October 2024

Abstract
We investigated the optoelectronic characteristics of cesium-based perovskite using various techniques. The steady-state photoluminescence (PL) spectroscopy of this perovskite solar cell composition shows the presence of strong peaks at a wavelength of 759 nm, which that corresponds to a band gap energy 1.63 eV. This band gap energy was estimated using two complementary methods, the PL emission spectra and the UV–vis absorption spectra. The study describes the dependence of photon energy on wavelength using a Gaussian mathematical model. Real-outdoor performance testing was conducted in Ethiopia’s climate during the hottest seasons to study the device performance under outdoor conditions at varying irradiances. Moreover, we investigated power generation from the devices using current–time measurements and analyzed charge carrier dynamics through transient photocurrent measurements.
Comparing sharp and smooth transitions of the second slow-roll parameter in single-field inflation
Authors: Kristiano Jason , Yokoyama Jun'ichi 
Published: October 2024

AbstractIn single-field inflation, violation of the slow-roll approximation can lead to growth of curvature perturbation outside the horizon. This violation is characterized by a period with a large negative value of the second slow-roll parameter. At an early time, inflation must satisfy the slow-roll approximation, so the large-scale curvature perturbation can explain the cosmic microwave background fluctuations. At intermediate time, it is viable to have a theory that violates the slow-roll approximation, which implies amplification of the curvature perturbation on small scales. Specifically, we consider ultraslow-roll inflation as the intermediate period. At late time, inflation should go back to the slow roll period so that it can end. This means that there are two transitions of the second slow-roll parameter. In this paper, we compare two different possibilities for the second transition: sharp and smooth transitions. Focusing on effects generated by the relevant cubic self-interaction of the curvature perturbation, we find that the bispectrum and one-loop correction to the power spectrum due to the change of the second slow-roll parameter vanish if and only if the Mukhanov-Sasaki equation for perturbation satisfies a specific condition called Wands duality. We also find in the case of sharp transition that, even though this duality is satisfied in the ultraslow-roll and slow-roll phases, it is severely violated at the transition so that the resultant one-loop correction is extremely large inversely proportional to the duration of the transition.
Research on the traceability of the value of the six-dimensional accelerometer
Authors: Li Haibin 
Published: October 2024

Abstract
With the rapid development of intelligent and electronic social development, people have proposed new and higher requirements for the multi-dimensional and comprehensive measurement of carrier acceleration. Based on the emergence of a new multi-dimensional sensor structure, this paper proposes a six-dimensional accelerometer measurement verification device and a traceability method for its value. Using the six-dimensional characteristics of the standard shaker, multiple accelerometers collect the multi-dimensional acceleration signal, and the six-dimensional acceleration of the standard shaker is obtained by solving the matrix and processing the acceleration signal. This method provides a direct verification method with strong compatibility and high feasibility, which can solve the problems caused by the current verification methods.
Structure design and analysis of circle wheel angle fine-tuning mechanism
Authors: Jiang Bo , Zhou Shun , Guo Yifan , Dong Yiming 
Published: October 2024

Abstract
In this paper, an angle fine-tuning mechanism for a monochromator is designed. Through finite element analysis, three kinds of flexure hinges are simulated and analyzed respectively, which are bow, chamfered straight beam, and oval. The results show that the chamfered straight beam hinge is the optimal design. The test results of the prototype show that the resolution of the designed angle fine-tuning mechanism can reach 0.1 arcsec and the repetition accuracy is less than 0.441 arcsec. All the indexes meet the needs of the monochromator. Therefore, the angle fine-tuning structure meets the requirements of sub-micro radian motion.
Single-channel high-precision laser rangefinder
Authors: Hayrapetyan Y. , Hunanyan H. 
Published: October 2024

Abstract
The article deals with the construction of a single-channel light rangefinder. At the same time, one of the main difficulties is the presence of depolarization of light, which forms residual light at the output of the analyzer, which greatly affects the measurement accuracy. It is shown that in order to exclude residual light by compensating for depolarization, a KDP crystal plate with the possibility of rotation in a plane parallel to the optical axis is installed at the input of the demodulator.

The possibility of using an optical delay line on a single mirror with the possibility of moving along the axis of the radiation source is also considered. The normal to the mirror surface and the optical axes of the KDP crystals are located to the axis of the light source at an angle of 0.7–0.9∘.
Sustainable bioinspired materials for regenerative medicine: balancing toxicology, environmental impact, and ethical considerations
Authors: Singh Ajay Vikram , Chandrasekar Vaisali , Prabhu Varsha M , Bhadra Jolly , Laux Peter , Bhardwaj Preeti , Al-Ansari Abdulla A , Aboumarzouk Omar M , Luch Andreas , Dakua Sarada Prasad 
Published: October 2024

Abstract
The pursuit of sustainable bioinspired materials for regenerative medicine demands a nuanced balance between scientific advancement, ethical considerations, and environmental consciousness. This abstract encapsulates a comprehensive perspective paper exploring the intricate dynamics of toxicology, environmental impact, and ethical concerns within the realm of bioinspired materials. As the landscape of regenerative medicine evolves, ensuring the biocompatibility and safety of these materials emerges as a pivotal challenge. Our paper delves into the multidimensional aspects of toxicity assessment, encompassing cytotoxicity, genotoxicity, and immunotoxicity analyses. Additionally, we shed light on the complexities of evaluating the environmental impact of bioinspired materials, discussing methodologies such as life cycle assessment, biodegradability testing, and sustainable design approaches. Amid these scientific endeavors, we emphasize the paramount importance of ethical considerations in bioinspired material development, navigating the intricate web of international regulations and ethical frameworks guiding medical materials. Furthermore, our abstract underscores the envisioned future directions and challenges in toxicology techniques, computational modeling, and holistic evaluation, aiming for a comprehensive understanding of the synergistic interplay between sustainable bioinspired materials, toxicity assessment, environmental stewardship, and ethical deliberation.
Uncertainty in model estimates of global groundwater depth
Authors: Reinecke Robert , Gnann Sebastian , Stein Lina , Bierkens Marc , de Graaf Inge , Gleeson Tom , Essink Gualbert Oude , Sutanudjaja Edwin H , Ruz Vargas Claudia , Verkaik Jarno , Wagener Thorsten 
Published: October 2024

Abstract
Knowing the depth at which groundwater can be found below the land surface is critical for understanding its potential accessibility by ecosystems and society. Uncertainty in global scale water table depth (WTD) limits our ability to assess groundwater’s role in a water cycle altered by changing climate, land cover, and human water use. Global groundwater models offer a top–down pathway to gain this knowledge, but their uncertainty is currently poorly quantified. Here, we investigate four global groundwater models and reveal steady-state WTD disagreements of more than 100 m for one-third of the global land area. We find that model estimates of land areas with shallow groundwater at <10 m depth vary from 10% to 71% (mean of 23%). This uncertainty directly translates into subsequent assessments, as land areas with potential groundwater accessibility for forests, population, and areas equipped for irrigation, differ substantially depending on the chosen model. We explore reasons for these differences and find that contrary to observations, 3 out of 4 models show deeper water tables in humid than in arid climates and greatly overestimate how strongly topographic slope controls WTD. These results highlight substantial uncertainty associated with any global-scale groundwater analysis, which should be considered and ultimately reduced.