bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantitative assessment of carotid ultrasound diameter measurements in the operating room: a comparable analysis of long-axis versus rotated and tilted orientation
Authors: de Boer Esmée C , Dinis Fernandes Catarina , van Neerven Danihel , Pennings Christoph , Joshi Rohan , Manzari Sabina , Shulepov Sergei , van Knippenberg Luuk , van Rooij John , Bouwman R Arthur , Mischi Massimo 
Published: February 2024

Abstract

Objective. Carotid ultrasound (US) has been studied as a non-invasive alternative for hemodynamic monitoring. A long-axis (LA) view is traditionally employed but is difficult to maintain and operator experience may impact the diameter estimates, making it unsuitable for monitoring. Preliminary results show that a new, i.e. rotated and tilted (RT) view is more robust to motion and less operator-dependent. This study aimed to quantitatively assess common carotid diameter estimates obtained in a clinical setting from an RT view and compare those to corresponding estimates obtained using other views. Approach. Carotid US measurements were performed in 30 adult cardiac-surgery patients (26 males, 4 females) with short-axis (SA), LA, and RT probe orientations, the first being used as a reference for measuring the true vessel diameter. Per 30 s acquisition, the median and spread in diameter values were computed, the latter representing a measure of robustness, and were statistically compared between views. Main results. The median (IQR) over all the patients of the median diameter per 30 s acquisition was 7.15 (1.15) mm for the SA view, 7.03 (1.51) mm for the LA view, and 6.99 (1.72) mm for the RT view. The median spread in diameter values was 0.18 mm for the SA view, 0.16 mm for the LA view, and 0.18 mm for the RT view. There were no statistically significant differences between views in the median diameter values (p = 0.088) or spread (p = 0.122). Significance. The RT view results in comparable and equally robust median carotid diameter values compared to the reference. These findings open the path for future studies investigating the use of the RT view in new applications, such as in wearable ultrasound devices.
Respiratory gating improves correlation between pulse wave transit time and pulmonary artery pressure in experimental pulmonary hypertension
Authors: Mueller-Graf Fabian , Frenkel Paul , Merz Jonas , Reuter Susanne , Vollmar Brigitte , Tusman Gerardo , Pulletz Sven , Böhm Stephan H. , Zitzmann Amelie , Reuter Daniel A , Adler Andy 
Published: February 2024

Abstract

Objective. Since pulse wave transit time (PWTT) shortens as pulmonary artery pressure (PAP) increases it was suggested as a potential non-invasive surrogate for PAP. The state of tidal lung filling is also known to affect PWTT independently of PAP. The aim of this retrospective analysis was to test whether respiratory gating improved the correlation coefficient between PWTT and PAP. Approach. In each one of five anesthetized and mechanically ventilated pigs two high-fidelity pressure catheters were placed, one directly behind the pulmonary valve, and the second one in a distal branch of the pulmonary artery. PAP was raised using the thromboxane A2 analogue U46619 and animals were ventilated in a pressure controlled mode (I:E ratio 1:2, respiratory rate 12/min, tidal volume of 6 ml kg−1). All signals were recorded using the multi-channel platform PowerLab®. The arrival of the pulse wave at each catheter tip was determined using a MATLAB-based modified hyperbolic tangent algorithm and PWTT calculated as the time interval between these arrivals. Main results. Correlation coefficient for PWTT and mean PAP was r = 0.932 for thromboxane. This correlation coefficient increased considerably when heart beats either at end-inspiration (r = 0.978) or at end-expiration (r = 0.985) were selected (=respiratory gating). Significance. The estimation of mean PAP from PWTT improved significantly when taking the respiratory cycle into account. Respiratory gating is suggested to improve for the estimation of PAP by PWTT.
Cerebral asymmetry representation learning-based deep subdomain adaptation network for electroencephalogram-based emotion recognition
Authors: Wang Zhe , Wang Yongxiong , Wan Xin , Tang Yiheng 
Published: February 2024

Abstract

Objective. Extracting discriminative spatial information from multiple electrodes is a crucial and challenging problem for electroencephalogram (EEG)-based emotion recognition. Additionally, the domain shift caused by the individual differences degrades the performance of cross-subject EEG classification. Approach. To deal with the above problems, we propose the cerebral asymmetry representation learning-based deep subdomain adaptation network (CARL-DSAN) to enhance cross-subject EEG-based emotion recognition. Specifically, the CARL module is inspired by the neuroscience findings that asymmetrical activations of the left and right brain hemispheres occur during cognitive and affective processes. In the CARL module, we introduce a novel two-step strategy for extracting discriminative features through intra-hemisphere spatial learning and asymmetry representation learning. Moreover, the transformer encoders within the CARL module can emphasize the contributive electrodes and electrode pairs. Subsequently, the DSAN module, known for its superior performance over global domain adaptation, is adopted to mitigate domain shift and further improve the cross-subject performance by aligning relevant subdomains that share the same class samples. Main Results. To validate the effectiveness of the CARL-DSAN, we conduct subject-independent experiments on the DEAP database, achieving accuracies of 68.67% and 67.11% for arousal and valence classification, respectively, and corresponding accuracies of 67.70% and 67.18% on the MAHNOB-HCI database. Significance. The results demonstrate that CARL-DSAN can achieve an outstanding cross-subject performance in both arousal and valence classification.
Electronic transport properties of WS2 using ensemble Monte Carlo method
Authors: Alyörük M Derya 
Published: February 2024

Abstract
The electronic transport characteristics of tungsten disulfide (WS2) sheets are studied using the ensemble Monte Carlo technique in the presence of intrinsic scattering mechanisms only. The transport properties of the material are obtained in a two-valley model where intra- and inter-valley scatterings are considered in K and Q valleys. The velocity overshoot effect is observed for some applied field values. Negative differential phenomena are seen for some values of the energy difference between K and Q valleys (

Δ

E

K
Q

), therefore

Δ

E

K
Q

and the effective mass of carriers in the Q valley has a critical role in the transport and mobility characteristics of WS2. The mobility of carriers is calculated as a function of temperature and the results are compatible with some existing theoretical and experimental predictions.
Bayesian approach of elliptical loci and RAPID for damage localization in wind turbine blade
Authors: Lu Jieshan , Zheng Yuqiao , Zhang Heyu , Cao Yongyong 
Published: February 2024

Abstract
This investigation addresses the issue of damage detection and localization in wind turbine blade laminates. This paper proposes a novel approach that integrates the elliptical trajectory and probabilistic imaging method using the Bayesian framework. This method employs multiple damage-sensitive features to enhance the reliability and robustness of sensor arrays. The algorithm is optimized by analyzing the propagation characteristics of Lamb waves in composite blade laminates. A numerical simulation is conducted on a 1.5 MW wind turbine blade laminate model, incorporating the scattered wave signal, wave arrival time, and correlation coefficient as damage characteristic signals. Markov Chain Monte Carlo sampling method is adopted to obtain the posterior distribution of the damage location and achieve accurate localization of blade delamination damage. The experimental results indicate that the damage localization algorithm, which utilizes the Bayesian approach, achieves an accuracy of approximately 97.04% in localizing delamination damage in blade laminates.
A fast actuated soft gripper based on shape memory alloy wires
Authors: Li Xiaozheng , Ma Yongxian , Wu Chuang , Wang Youzhan , Zhou Shoujun , Gao Xing , Cao Chongjing 
Published: February 2024

Abstract
The application of shape memory alloy (SMA) actuated soft grippers is limited by their slow recovery speed. In order to further expand their application range, as one of the solutions to address this limitation, this paper proposes a fast actuated soft gripper based on SMA wire active heat dissipation and elastic rib combination to meet the rapid actuation and recovery. The structure primarily consists of a heat dissipation module capable of winding SMA wire and a soft structure resembling a scorpion tail with embedded supper elastic SMA wire. The geometric structure model, dynamics and SMA constitutive model and finite element model of the soft gripper are established, and the lateral deformation of soft bionic scorpion tail end is analyzed through simulations and experiments. In addition, the force in designed soft gripper tip and its ability to grasp different objects are also studied through experiments. The results show that the addition of a cooling fan increased the recovery rate by about 25%, and the force in soft bionic scorpion tail end can reach about 0.12 N. The designed soft gripper can successfully grasp objects with different softness, shape, size and weight. It lays a theoretical foundation and technical support for the development of soft grippers actuated by SMA in the future.
A superconducting switch using induced current in the closed loop circuit
Authors: Li Gengyao , Li Chao , Xin Ying , Li Bin 
Published: February 2024

Abstract
Superconducting magnets have been applied in many fields because of the high magnetic field and the low loss. In order to energize superconducting magnets and operate them in the persistent current mode, the superconducting switch is essential. Recently, a superconducting switch using the interaction between the DC transport current and induced current in a closed loop circuit has been proposed, which cannot only respond fast, but also operate efficiently. In this work, an analytical model based on equivalent circuit is proposed to explain the working principle of this type of superconducting switch. An experimental protype is built to investigate its electromagnetic behaviors and working performance. Impacting factors of the voltage across the superconducting switch have been clarified based on experimental results. The method based on asymmetric AC magnetic field is proposed to enhance the average voltage across the superconducting switch and its performance has been verified through experimental tests. Besides, the advantages and application prospects of the superconducting switch are discussed.
Competition between drift and topological transport of colloidal particles in twisted magnetic patterns
Authors: Stuhlmüller Nico C X , Fischer Thomas M , de las Heras Daniel 
Published: February 2024

Abstract
We simulate the motion of paramagnetic particles between two magnetic patterns with hexagonal symmetry that are twisted at a magic angle. The resulting Morié pattern develops flat channels in the magnetic potential along which colloidal particles can be transported via a drift force of magnitude larger than a critical value. Colloidal transport is also possible via modulation loops of a uniform external field with time varying orientation, in which case the transport is topologically protected. Drift and topological transport compete or cooperate giving rise to several transport modes. Cooperation makes it possible to move particles at drift forces weaker than the critical force. At supercritical drift forces the competition between the transport modes results e.g. in an increase of the average speed of the particles in integer steps and in the occurrence of subharmonic responses. We characterize the system with a dynamical phase diagram of the average particle speed as a function of the direction of the topological transport and the magnitude of the drift force.
Deficiency-induced absence of topological insulator behavior in antiperovskite Dirac metal oxide Sr3-x SnO: a DFT study
Authors: Zergou Ismail , Zaari Halima , Benyoussef Abdelilah , El Kenz Abdallah 
Published: February 2024

Abstract
This study focuses on Sr3SnO (SSO), an antiperovskite Dirac metal-oxide (ADMO), that exhibits improved and enhanced physical properties when decreasing the number of Strontium (Sr) atoms in the crystal structure Sr3-xSnO. Stability and electronic properties calculations were performed using the density functional theory (DFT). Furthermore, transport and thermoelectric properties were determined by solving the Boltzmann transport equation implemented in BoltzTraP code. We report a topological insulator behavior when applying spin–orbit coupling (SOC) to pristine SSO. This behavior became absent when Sr concentration decreased. Moreover, when increasing oxygen concentration (Sr3SnO2), we reveal an improvement in the system’s stability. Electrical conductivity enhanced, for both Sr deficient SSO and for oxygen excess, reaching a value of

1.8
×

10

20

1
/
Ω
.
m
.
s

for x = 1. In addition, we show that Sr3-xSnO possesses both p-type and n-type nature, depending on the value of Sr deficiency concentration x, which makes this compound a suitable candidate for a thermoelectric generator (TEG) module.
Design and analysis of hetero-dielectric Junctionless-TFET(JL-TFET) with N+ pocket as label free biosensors
Authors: Kumawat Meghna , Gopal Girdhar , Varma Tarun 
Published: February 2024

Abstract
This paper includes sensitivity assessment of label-free biosensors using hetero dielectric Junctionless-TFET (HD-JL-TFET) thorough TCAD simulator. The fundamental structure, operation and design of a Junctionless-TFET (HD-JL-TFET) as biosensor are investigated in this paper. For the purpose of detecting the biomolecule, a nano-gap is added close to the source end between the gate and channel. To test the sensing potential, we adjusted the charge density and material dielectric constant (K) by comprehensive calibrated device simulation. For several biomolecules, the device’s sensitivity was examined as surface potential, electron tunnelling rate, and conduction-valence band edge fluctuation. Additionally, the Id versus VGS features, the sensitivity to the drain current, and the ION/IOFF fluctuation are also examined. By contrasting neutral or charged biomolecules using various dielectric constants, the sensitivity characteristics of positive, negative, and neutral biomolecules are examined. The development of biosensors, which enable the rapid and precise detection of multiple biomolecules, has revolutionized the field of bioanalysis.
Enhanced interfacial polarization through the conversion of Co@C into Co@Co1−xS@C nanocapsules utilizing a facile sulfidation process
Authors: Zhou Yuanliang , Javid Muhammad , Saleem Muhammad Farooq , Shi Yonghua , Wang Hesheng , Kashif Muhammad , Jiang Xishun 
Published: February 2024

Abstract
The design and development of efficient Co-based electromagnetic (EM) absorbents with double-shell structures have received relatively less attention in the literature. The construction of multiple heterointerfaces gives rise to a unique morphology that holds significant potential in expanding the absorbing frequency range. Co@Co1−xS@C nanocapsules (NCs) with Co as the cores, Co1−xSx and C as the middle and outside shells separately, were successfully prepared using a facile two step process: synthesizing Co@C core–shell NCs by arc-discharge method and subsequently converting them into Co@Co1−xS@C NCs through chemical sulfidation reaction. The experimental results indicate that the thickness of the carbon shell exhibits a decreasing trend (from 1 ± 0.1 nm to 0.6 ± 0.02 nm) following the post-sulfidation process, lasting for approximately two hours. The defect density of the carbon shell also declines from 1.88 × 1011 cm−2 to 1.14 × 1011 cm−2. The reduction in thickness of the carbon shell and the formation of new Co1-xS not only enable efficient manipulation of impedance matching between the dielectric shells and magnetic cores but also facilitate the construction of multiple interfacial polarizations. The study provides evidence that the multi-interfacial Co@Co1−xS@C nanocomposite serves as an effective EM absorbent achieving a minimum reflection loss (RL) up to –78.6 dB at a thickness of merely 1.52 mm within the frequency range of 2~18 GHz.
An in-beam Source-frequency Phase Referencing VLBI Positioning Method for China’s First Martian Rover
Authors: Tong Fengxian , Zheng Weimin , Zhang Juan 
Published: February 2024

Abstract
Very long baseline interferometry (VLBI) plays a crucial role in geodesy and astrometry, and it is also being successfully used in spacecraft tracking. Phase referencing VLBI is a technique that uses phase information rather than the traditional VLBI group time delay to achieve higher measurement accuracy. The newly developed source-frequency phase referencing (SFPR) VLBI has been proven to be a powerful method to eliminate errors, but for positioning purposes, only “core shifts” are left in SFPR. Therefore, in this paper, an in-beam SFPR (IB-SFPR) VLBI method based on SFPR is proposed to overcome the positioning deficiency in SFPR, and to achieve high positioning accuracy. The proposed IB-SFPR method is further researched in more detail and shown to have the ability to achieve high positioning accuracy. For the first Martian rover of China, the IB-SFPR is first applied in its positioning. The positioning results of the rover have shown that the 1σ formal position error is hundreds of meters, with a formal error of post-fitted phase time delay of about 1.3 ps. However, the position discrepancies among the results of IB-SFPR, the guidance, navigation and control system, and the visual localization are at kilometer level, which are mainly affected by the orbit error of the orbiter. Therefore, considering the external reference’s (the obiter) orbit error, the final positioning accuracy of the Martian rover is at the kilometer level.
Study of scalar particles through the Klein–Gordon equation under rainbow gravity effects in Bonnor–Melvin-Lambda space-time
Authors: Ahmed Faizuddin , Bouzenada Abdelmalek 
Published: February 2024

Abstract
In our investigation, we explore the quantum dynamics of charge-free scalar particles through the Klein–Gordon equation within the framework of rainbow gravity, considering the Bonnor–Melvin-Lambda (BML) space-time background. The BML solution is characterized by the magnetic field strength along the axis of the symmetry direction which is related to the cosmological constant Λ and the topological parameter α of the geometry. The behavior of charge-free scalar particles described by the Klein–Gordon equation is investigated, utilizing two sets of rainbow functions: (i)

f
(
χ
)
=

(

e

β

χ

−
1
)

β

χ

, h(χ) = 1 and (ii) f(χ) = 1,

h
(
χ
)
=
1
+

β

χ

2

. Here

0
<

χ
=

∣
E
∣

E

p

≤
1

with E representing the particle’s energy, E

p
is the Planck’s energy, and β is the rainbow parameter. We obtain the approximate analytical solutions for the scalar particles and conduct a thorough analysis of the obtained results. Afterwards, we study the quantum dynamics of quantum oscillator fields within this BML space-time, employing the Klein–Gordon oscillator. Here also, we choose the same sets of rainbow functions and obtain the approximate eigenvalue solution for the oscillator fields. Notably, we demonstrate that the relativistic approximate energy profiles of charge-free scalar particles and oscillator fields get influenced by the topology of the geometry and the cosmological constant. Furthermore, we show that the energy profiles of scalar particles receive modifications from the rainbow parameter and the quantum oscillator fields by both the rainbow parameter and the frequency of oscillation.
Patterned collagen films loaded with miR-133b@MBG-NH2 for potential applications in corneal stromal injury repair
Authors: Zhan Guancheng , Yu Lixia , Wang Qiqi , Jin Longyang , Yin Xiaohong , Cao Xiaodong , Gao Huichang 
Published: February 2024

Abstract
Corneal stromal injury is a common surgical disease. With the development of tissue engineering materials, many artificial corneal scaffolds have been developed to replace allograft corneal transplantation and solve the problem of corneal donor shortage. However, few researchers have paid attention to corneal stromal wound healing. Herein, a nanocomposite of amino modified mesoporous bioactive glass (MBG-NH2) and microRNA-133b (miR-133b) was introduced into the patterned collagen films to achieve corneal stromal injury repair. MBG-NH2 nanoparticles as a nano delivery carrier could efficiently load miR-133b and achieve the slow release of miR-133b. The physicochemical properties of collagen films were characterized and found the microgrooved collagen films loaded with miR-133b@MBG-NH2 nanoparticles possessed similar swelling properties, optical clarity, and biodegradability to the natural cornea. In vitro cell experiments were also conducted and proved that the patterned collagen films with miR-133b@MBG-NH2 possessed good biocompatibility, and miR-133b@MBG-NH2 nanoparticles could be significantly uptake by rabbit corneal stromal cells (RCSCs) and have a significant impact on the orientation, proliferation, migration, and gene expression of RCSCs. More importantly, the patterned collagen films with miR-133b@MBG-NH2 could effectively promote the migration of RCSCs and accelerate wound healing process, and down-regulate the expression levels of α-SMA, COL-I, and CTGF genes associated with myofibroblast differentiation of corneal stromal cells, which has a potential application prospect in the repair of corneal stromal injury.