bluuebunny/crossref_metadata_2025_split huggingface dataset:
High Prevalence of Seasonal and Current Groin Problems in Rink Hockey
Players
Authors: Quintana-Cepedal Marcos , de Pablo Marquez Bernat , del Valle Soto Miguel , Olmedillas Hugo 
Published: February 2024

AbstractGroin problems are common in multidirectional sports. The aim of the present
study is to assess seasonal, current, and trends for groin problems in rink
hockey players, irrespective of their playing position, age, or gender. Rink
hockey players from three countries [n=446 (162 female, 284 male)] were invited
to participate in an online questionnaire. This form evaluated the prevalence of
groin problems (time-loss and non-time-loss) for the 2022–2023 season, as well
as monthly prevalence of groin problems (time-loss and non-time-loss). All groin
problems were compared between playing position, gender, and age to assess
between-group differences. Senior males reported the highest time-loss (25%) and
non-time-loss (51%) for seasonal prevalence; while U-17 males reported the
lowest in both categories of groin problems (time-loss 9%, non-time-loss 27%).
No significant differences between playing position or gender were found for any
of the groin problems analyzed. In-season prevalence (9–15.7%) of groin problems
was significantly higher than pre-season (7.4%) prevalence (p<0.01). Seasonal
prevalence of groin problems is common in rink hockey, regardless of gender,
playing position, or age. Preventive efforts should be directed towards all
players, regardless of their individual characteristics.
Endoscopic Ultrasound-Guided Rendezvous Pancreatic Duct Stenting in Pancreas Divisum Using Modified Cannula
Authors: Kanjamala Kiran Josy , Zacharias Prakash , Mathew Shibi , Madhu Deepak , Ahamed Hasim , Mohmed Bilal , Philip Mathew 
Published: February 2024

AbstractThis video is of a 65 year old female patient with history of systemic hypertension, type 2 diabetes and coronary artery disease on medical management. She presented with features of acute pancreatitis which was managed conservatively and imaging showed features of chronic pancreatitis with dilated pancreatic duct and pancreas divisum was suggested. She had two further episodes of acute pancreatitis and was managed conservatively. Pancreatic stenting was suggested but during ERCP minor papillae couldn't be identified. Hence, EUS guided Rendez - vous pancreatic duct puncture and minor papillae stenting was done with the help of a modified cannula.
Design of a 140 GHz waveguide notch filter for millimeter-wave receiver module protection in fusion plasma diagnostics
Authors: Qiu Shasha , Himes Logan , Domier Calvin , Tang Xiaopin , Liu Xianzi , Hu Fengqi , Yu Guanying , Li Xiaoliang , Zhu Yilun , Luhmann Neville , Xie Jinlin , Wu Zhengwei 
Published: February 2024

A carefully designed waveguide-based millimeter-wave notch filter, operating at 140 GHz, safeguards plasma diagnostic instruments from gyrotron leakage. Utilizing cylindrical cavity resonators with aperture coupling, the filter efficiently resonates 140 GHz wave-power into the TE11p mode, optimizing various geometrical parameters for practical fabrication and high-yield production. Thorough thermal analysis ensures its ability to handle power. The filter achieves outstanding performance with over 90 dB rejection at 140 GHz while providing low insertion loss over the passband (110–138 GHz), which is ideally suited for system-on-chip approach F-band diagnostic system applications.
Development and analysis of two-dimensional point-ahead angle mechanism for space gravitational-wave detection
Authors: Zhu Weizhou , Xie Yong , Qian Yuchen , Jia Jianjun , Zhang Liang , Wang Xue 
Published: February 2024

To detect low-frequency gravitational waves, it is necessary to eliminate the interference of geo-noise and build a laser interference gravitational-wave detection device in space. Space gravitational-wave detection missions, namely Taiji, LISA, and Tianqin, have been planning to achieve picometer sensitivity on an interferometer arm of several million kilometers to meet the gravitational-wave detection requirements. Because of the orbit evolution and the time delay in interferometer arms, the direction of the transmitted laser beam changes; consequently, a remote telescope cannot receive the laser beam to complete the inter-satellite laser interference. In this study, a two-dimensional point-ahead angle mechanism (2DPAAM) is designed and demonstrated to solve the aforementioned problem. Based on the design concept of aligning the rotation center with the mirror surface center, the 2DPAAM employs a four-link flexible-hinge structure, length expanding and contracting piezoelectric stack actuators, and closed-loop control of capacitive sensors to realize two-dimensional picometer-stable, high-precision rotation. A static model is established to analyze the rotational characteristics, and finite element analysis is performed to study the mechanical properties and to verify the rotational characteristics. The yaw and pitch stiffness errors are ∼0.93% and 5.9%, respectively, when the theoretical results are compared with the simulation results. A series of experiments are conducted on the developed 2DPAAM, and the results show that the rotary ranges of yaw and pitch motions attain ±270 and ±268 µrad, respectively. The rotational accuracies of both yaw and pitch motions attain ∼0.35 µrad, and the optical path difference is less than 10pm/Hz when the frequency is between 1 mHz and 1 Hz, by analogy.
Mach’s principle-based model of the origin of mass
Authors: Chen Yu-Jie , Liu Yuan-Yuan , Chen Yu-Zhu , Li Wen-Du , Dai Wu-Sheng 
Published: February 2024

Abstract
In this paper, we present a Mach’s principle-based model of the origin of mass. According to Mach’s principle, the mass of matter arises from the coupling with the rest of the Universe rather than being an inherent property of matter itself. This model, in a sense, provides a model realization of Mach’s principle. In this model, the mass of matter is determined by spacetime. We illustrate the model by solving exact solutions in various spacetimes, such as static spherical, Robertson-Walker, and static cylindrical spacetimes.
The monotonicity method for inclusion detection and the time harmonic elastic wave equation
Authors: Eberle-Blick Sarah , Pohjola Valter 
Published: February 2024

Abstract
We consider the problem of reconstructing inhomogeneities in an isotropic elastic body using time harmonic waves. Here we extend the so called monotonicity method for inclusion detection and show how to determine certain types of inhomogeneities in the Lamé parameters and the density. We also included some numerical tests of the method.
Restoring the discontinuous heat equation source using sparse boundary data and dynamic sensors
Authors: Lin Guang , Ou Na , Zhang Zecheng , Zhang Zhidong 
Published: February 2024

Abstract
This study focuses on addressing the inverse source problem associated with the parabolic equation. We rely on sparse boundary flux data as our measurements, which are acquired from a restricted section of the boundary. While it has been established that utilizing sparse boundary flux data can enable source recovery, the presence of a limited number of observation sensors poses a challenge for accurately tracing the inverse quantity of interest. To overcome this limitation, we introduce a sampling algorithm grounded in Langevin dynamics that incorporates dynamic sensors to capture the flux information. Furthermore, we propose and discuss two distinct dynamic sensor migration strategies. Remarkably, our findings demonstrate that even with only two observation sensors at our disposal, it remains feasible to successfully reconstruct the high-dimensional unknown parameters.
Bi-level iterative regularization for inverse problems in nonlinear PDEs
Authors: Ngoc Nguyen Tram Thi 
Published: February 2024

Abstract
We investigate the ill-posed inverse problem of recovering unknown spatially dependent parameters in nonlinear evolution partial differential equations (PDEs). We propose a bi-level Landweber scheme, where the upper-level parameter reconstruction embeds a lower-level state approximation. This can be seen as combining the classical reduced setting and the newer all-at-once setting, allowing us to, respectively, utilize well-posedness of the parameter-to-state map, and to bypass having to solve nonlinear PDEs exactly. Using this, we derive stopping rules for lower- and upper-level iterations and convergence of the bi-level method. We discuss application to parameter identification for the Landau–Lifshitz–Gilbert equation in magnetic particle imaging.
Linear enhancement of mechanical compliance by zeolite filling in a compact loudspeaker
Authors: Chen Jin , Tan Fa , Li Ximin , Lu Xingyu , Zhao Degang , Liu Jiamei , Zhou He , Lu Qiuhong , Qian Lihua 
Published: February 2024

Abstract
A zeolite filling in the rear cavity of a compact loudspeaker enhances the sound pressure amplitude of the loudspeaker system with a frequency range up to ∼500 Hz, but its intrinsic mechanisms remain elusive. We theoretically consider the gas adsorption–desorption behavior on zeolite that can be dynamically perturbed by sound pressure from the diaphragm of the loudspeaker. By merging equivalent circuit theory with gas thermodynamic theory, a linear relationship between mechanical compliance and zeolite volume in the rear cavity is quantitatively modeled. Confirmed by electroacoustic impedance experiments, the linear relationship with a slope of 1.92 mF cm−3 reveals the intrinsic ability of porous material to enhance mechanical compliance by adsorption of gas onto the zeolite in the rear cavity. This study correlates the kinetic behavior of air molecules on zeolite and acoustic behavior; it offers a novel insight to improve the performance of a compact loudspeaker by simple filling with porous material and introduces a comprehensive method for evaluating gas adsorption–desorption dynamics in porous media.
Comparative study of variant shifting-phase coding method based on noise error model
Authors: Wu Yanxue , Mu Quan , Cheng Zhou , Li Wanyi , Yang Shichao , Yang Tian , Liu Fei 
Published: February 2024

Abstract
Phase shifting algorithm, which is well-known for its high-accuracy and high-resolution, plays a crucial role in fringe projection profilometry. A class of variant shifting-phase coding method (VSPCM) has been proposed for high-speed 3D measurement. The three kinds of VSPCM include the inner shifting-phase method (ISPM), the intensity-coded method (ICM) and the modified Carré algorithm (MCA). These methods project only four patterns avoiding the need for extra images, yet achieve accuracy comparable to the classical three-frequency heterodyne method. In VSPCM, the shifting-phase, as a key code-word for phase unwrapping, is encoded as a variable value. In practice, the noise and the encoding of shifting-phase have varying degrees of impact on the performance of these methods. But the coded ranges of the shifting-phase were previouly empirical values. Besides, there are no studies related to these factors, and also a lack of comparative researches on such methods. This paper compares three kinds of VSPCM for the first time. We derive the noise error models for shifting-phase and wrapped phase in three methods and examine the impact of variant shifting-phase on fringe orders and wrapped phase in these methods. We find that the abnormal shifting-phase errors predominantly cause fringe orders errors. Fortunately, median filtering can effectively handle shifting-phase errors to ensure successful phase unwrapping. To improve their accuracy, we also deduce that the optimal shifting-phase encoding range is [−77°, 77°] for ISPM, and is [−61°, 61°] for ICM, and is [34°, 74°] for MCA. For wrapped phase errors, the distributions of ICM and MCA exhibit a U-shaped distribution, while ISPM demonstrates a uniform distribution. Based on theoretical analysis and experiment results, this paper gives recommendations for better use of these methods to boost their accuracy and offers valuable guidance for selecting an appropriate VSPCM under the specific measurement requirements.
Optical, conductive, and ferroelectric properties of the first layer of dip-coated BiFeO3 films from methoxyethanol and acetic acid-based chemical dissolvents
Authors: Diliegros-Godines Carolina J , Flores-Ruiz Francisco Javier 
Published: February 2024

Abstract
The overall performance of the multilayer resulting in a sol-gel bismuth ferrite (BiFeO3) film will be primarily determined by the properties of the first layer, but this has yet to receive much attention, even though chemical and morphological defects of this layer can accumulate as the number of layers increases. Here, we perform an optical, conductive, and ferroelectric study of first layer (L
1) dip-coating sol-gel BiFeO3 films using two routes that vary only in the dissolvent; the first one is based on 2-methoxyethanol (MOE), and the second one on acetic acid (AA) with some MOE (AA-MOE). Tauc plots reveal a band gap of 2.43 eV and 2.75 eV for MOE (30 ± 5 nm thick) and AA-MOE (35 ± 5 nm thick) films, respectively. MOE films showed a dielectric function with features at ∼2.5 eV, ∼3.1 eV, and ∼3.9 eV, which were associated with charge-transfer transitions, but such features are absent in AA-MOE films. Advanced atomic force microscopy techniques were used to identify the fine features or defects of the BiFeO3 films: The conductive maps show that the charge transport pathways in both film routes are controlled by nanometer defects rather than grain or grain boundary defects. Current-voltage curves reveal high conductive pathway at a lower voltage for the MOE films than for AA-MOE films. The piezoelectric coefficient for MOE films was ∼20% higher than AA-MOE films. Both deposition methods yield ferroelectric films with an electromechanical strain controlled by the piezoelectric effect and minimal contribution from electrostriction. An optimization for the AA-MOE-based route in the withdrawal speed results in a significant reduction of morphological defects and a more than twofold increase in the piezoelectric coefficient. Our results broaden the understanding of optical and ferroelectric BiFeO3 films based on a chemical solution by dip-coating.
Design and simulation of a nano biosensor based on amorphous indium gallium zinc oxide (a-IGZO) thin film transistor
Authors: Ahangari Zahra 
Published: February 2024

Abstract
In this study, a biosensor utilizing a dielectric-modulated amorphous indium gallium zinc oxide (a-IGZO) thin film transistor (TFT) is introduced. TFT biosensors have garnered significant attention due to their heightened sensitivity, scalable nature, low power consumption, rapid electrical detection capabilities, and cost-effective means of mass production. By embedding a nano-cavity within the gate insulator of the TFT, biomolecules can accumulate within. As each biomolecule possesses its own dielectric constant, it modulates the effective gate capacitance and, subsequently, changes the channel conductance. To assess the sensitivity of the biosensor, variation in saturation current after the absorption of biomolecules with respect to the drain current in the case of an air-filled cavity has been considered as a precise measure. The efficient operation of a biosensor is contingent upon the sensitivity being highly dependent on the dielectric constant of the biomolecules that are accumulated within the nano-cavity. Consequently, a comprehensive evaluation has been conducted to ascertain the impact of critical design parameters which have the potential to affect the sensitivity of the biosensor. Additionally, a statistical analysis based on coefficient of variation measure has been performed to evaluate the susceptibility of the biosensor’s sensitivity to variations in geometrical and physical design parameters. The utilization of label-free detection methodology in this device presents a notable advantage due to its compatibility with the fundamental CMOS processing technology and its cost-effective potential for macro production.
Theoretical prediction of a novel hexagonal narrow-gap silicon allotrope under high pressures
Authors: Hu Huimin , Choi Jin-Ho 
Published: February 2024

Abstract
Silicon material plays a vital role in contemporary technology-related fields, including electronics and the photovoltaics. There is a growing demand for exploring new silicon structures with potential applications, and numerous metastable structures have been reported. In this study, we present the prediction of a novel stable sp
3 hybridized silicon allotrope using particle swarm optimization global structure search. The predicted Si allotrope is a semiconductor with an indirect band gap of approximately 0.21 eV. It possesses three Si basis atoms in the unit cell, and we named it Si3. Interestingly, when subjected to strain, it undergoes a transition from a semiconductive state to a metallic state. Furthermore, moderate tensile strain enhances the interactions between silicon and lithium atoms, suggesting its potential for Li-ion batteries. Additionally, Si3 exhibits exceptional sunlight absorption across a wide range of wavelengths, with a significantly higher light absorption intensity than cubic diamond silicon. These findings have important implications for photovoltaic applications.
Current driven properties and the associated magnetic domain walls manipulation in U-shaped magnetic nanowires
Authors: Gong Guangjian , Wang Yu , Gao Zhongchen , Hu Jingguo 
Published: February 2024

Abstract
Based on the extended Landau–Lifshitz–Gilbert method, the properties of current driven domain wall movement in U-shaped magnetic nanowires and the effect of spin wave assistance on their properties have been investigated. The results show that changes of the curvature radius of magnetic nanowire can cause the additional pinning action and the pinning action will weaken the speed of current driven domain wall movement. For U-shaped magnetic nanowires, the changes of curvature radius can be represented by the radius R at the bend. The results show that the decline of its speed non-monotonically increases with the decrease of the bending radius of magnetic nanowires. On the other hand, the assistance of applying spin waves not only enhances the movement of magnetic domain walls but also weakens the pinning action. Further research has shown that applying the appropriate spin waves at the bend changing point can completely eliminate the influence induced by bend changing, in order to ensure uniform and stable movement of current driven magnetic domain walls in U-shaped magnetic nanowires, and achieve the current driven three-dimensional racetrack memory technology.
Dynamics of cascading failure in cyber-physical power systems from cyber attack
Authors: Chen Lei , Guo Sijia , Dou Chunxia , Ge Hui , Cheng Zihao , Li Shengquan 
Published: February 2024

Abstract
Through communication network, cyber-physical power systems can effectively monitor and control physical power grid, but this also increases the danger to systems from cyber attack. In this paper, we study the cascading failure triggered by cyber attack, which infects cyber nodes through malware and to endanger physical nodes through coupling links. First, the flow and topology models for cyber-physical power systems are detailed. In communication network, we analyze the mechanism of diffusion and infection among cyber nodes, and differentiate cyber nodes into three types, corresponding to different state of cyber nodes before and after cyber attack. And in physical power grid, the types of physical nodes are also classified. For different state of cyber nodes, we detail their impact on physical nodes and power flows in physical power grid. Simulation analyzes the robustness of systems and dynamics of cascading failure in different attack scenes and topology structure.
The geometry, electronic and magnetic properties of Zr
n
Ni (n = 2-14) clusters: A first-principles jointed particle-swarm-optimization investigation
Authors: Du Yan , Wang Yizhi , Ji Xu , Cui Xiuhua , Duan Haiming , Cao Haibin , Jing Qun 
Published: February 2024

Abstract
Zirconium-nickel binary alloys and metal glass have superior performance like ultrahigh fracture strength, good toughness. In this paper, the structures of small-sized Zr
n
Ni (n = 2–14) clusters have been searched using the particle swarm algorithm in combination with density-functional theory (DFT). The geometrical configuration tends to form a three-dimensional structure as the number of atoms in the cluster increases. By calculating the average binding energy per atom, second-order difference of energy, and dissociation energy of Zr
n
Ni (n = 2–14) clusters, it is demonstrated that Zr
n
Ni (n = 7, 12) clusters are more stable than their neighbors, and can be used as a candidate structure for magic number clusters. The electron localization function (ELF) calculations reveal those metallic bonds of Zr-Ni and Zr-Zr atoms. The Adaptive natural density partitioning results show that there are 20 three-center and 7 seven-center two-electron orbitals which make the quenching of magnetic moments of Zr12Ni atoms.
Future changes in state-level population-weighted degree days in the U.S
Authors: Gesangyangji Gesang , Holloway Tracey , Vimont Daniel J , Acker Summer Joy 
Published: February 2024

Abstract
This study analyzes future changes in population-weighted degree-days in 48 states over the contiguous U.S. Using temperature data from the NASA Earth Exchange Global Daily Downscaled Projects and population data from NASA Socioeconomic Data and Applications Center, we computed population-weighted degree-days (PHDD and PCDD) and EDD (energy degree-days, PHDD + PCDD) over the 21st century, under a business-as-usual scenario. Results show that although the rising temperature is the primary driver, population distribution and projection play undeniable roles in estimating state-level heating and cooling demand. Throughout the 21st century, the U.S. is projected to experience a heating-to-cooling shift in energy demand, with the number of heating-dominant states dropping from 37 to 17 and the length of cooling seasons extending by 2 months (indicating a corresponding reduction in heating seasons) in all states by late-century. Meanwhile, a more homogenous EDD pattern is expected due to the increasing PCDD and decreasing PHDD, and the peak EDD month will switch from winter to summer in 15 out of 48 states. Our study provides a more nuanced understanding of future heating and cooling demand by examining both annual and monthly variations in the demands and how their relative dominance in a single framework may evolve over time. The study’s state-level perspective can provide valuable insights for policymakers, energy providers, and other stakeholders regarding the forthcoming shift in demand patterns and related building operations and energy consumption at both state and regional levels.