bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of service dogs on veterans’ romantic partners and relationships: A preliminary mixed-methods study
Authors: L. Williamson , G. Rath , K. Arisman , J. Moss , C.A. Dell 
Published: October 2024

Abstract

Romantic partners are often key supports for veterans diagnosed with posttraumatic stress disorder (PTSD). However, a PTSD diagnosis among veterans is often associated with lower relationship satisfaction and quality. To help reduce their PTSD symptomology, some veterans are more regularly relying on the help of service dogs (SDs). Relatively little is known about how SDs affect romantic relationships and veterans’ romantic partners. The current mixed-methods preliminary study explored the psycho-social effects of SDs on veterans’ romantic relationships and their partners from the romantic partners’ perspective. Romantic partners of veterans (
N
= 27) completed the Partnership Questionnaire and seven partners completed interviews. Scale results indicated overall low relationship quality, with relatively lower scores for couples’ tenderness/intimacy and togetherness/communication, and higher scores for their quarreling. Interview results indicated there were perceived relationship problems due to the veterans’ PTSD, but there were some relationship improvements since the SD had been supporting the veteran, including decreased quarreling and increased tenderness/intimacy and togetherness/communication. Romantic partners reported experiencing less resentment and stress, and increased relaxation, calmness, patience, happiness, and hope for the future because of the SDs. This study suggests that SDs can influence other aspects of veterans’ lives beyond their disability, such as helping veterans reconnect with their romantic partners.
A natural model for curved inflation
Authors: Vigneron Quentin , Larena Julien 
Published: October 2024

Abstract
Inflationary models with a non-zero background curvature require additional hypothesis or parameters compared to flat inflation and the procedure to construct them cannot be as simple as in the flat case. For this reason, there is no consensus on the primordial power spectrum that should be considered at large scales in a curved Universe. In this letter, we propose a model of curved inflation in which the usual canonical quantization and Bunch–Davies vacuum choice of the flat case can be considered. The framework is a recently proposed modification of general relativity (GR) in which a non-dynamical topological term is added to the Einstein equation. The model is universal as it is the same for any background curvature, and no additional parameters or hypothesis on the initial spatial curvature are introduced. This gives a natural and simple solution to the problem of constructing curved inflation, and at the same time provides an additional argument for this topological modification of general relativity.
Impact of stacking faults on the luminescence of a zincblende InGaN/GaN single quantum well
Authors: Gundimeda Abhiram , Kusch Gunnar , Frentrup Martin , Xiu Huixin , Shu Ruiying , Hofer Christina , Bagot Paul A J , Moody Michael P , Kappers Menno J , Wallis David J , Oliver Rachel A 
Published: October 2024

Abstract
In this paper, we investigate the optical properties of a zincblende InGaN single quantum well (SQW) structure containing stacking faults (SFs). Cathodoluminescence studies revealed the presence of sharp emission features adjacent to SFs, identified as quantum wires (Qwire) via their spatial anisotropy. Scanning transmission electron microscopy provided evidence of indium rich regions adjacent to SFs which intersect the QW along the [110] and [1–10] directions, whilst atom probe tomography revealed that the indium rich regions have an elongated structure, creating a Qwire. This work sheds light on the intricate relationship between SFs and Qwires in zincblende InGaN SQW structures, offering insights into the underlying mechanisms governing their optical behavior.
Design and testing of a microwave Doppler-based yield estimation system for machine-picked seed cotton
Authors: Li Yuhang , Feng Jingan , Zhang Feng , Diao Shengang , Chen Jing 
Published: October 2024

Abstract
Accurately obtaining crop yields is an important part of the precision agriculture technology system; with the increased mechanisation of cotton planting and harvesting, it has become particularly important to accurately obtain seed cotton yield data. In order to achieve accurate estimation of machine-picked seed cotton yield, this paper designs a machine-picked seed cotton yield estimation system based on microwave Doppler principle. Based on LabVIEW software, the signal acquisition circuit is designed; the power spectrum of the echo signal is estimated; the signal echo power is obtained; the relationship model between echo power and seed cotton mass is established by using multiple regression equations; and the reliability of the model is verified by using statistical methods. By adjusting the rotational speed of the fan, the wind speed at the inlet of the cotton pipeline was 10 m s−1, 15 m s−1 and 20 m s−1, and the yield estimation tests were carried out at the three wind speeds, and the data showed that the average absolute percentage errors of the estimation at the three wind speeds were 7.36%, 7.72% and 8.17%, and the mean squared errors were 2.699, 4.938 and 4.026, respectively. The test results show that the accuracy of seed cotton mass estimation under the three wind speeds basically meets the needs of the yield measurement system, and the systematic error of seed cotton yield estimation is the smallest when the wind speed is 10 m s−1.
EPVC: a novel initialization approach of visual-inertial integrated navigation
Authors: Gu Xiaobo , Zhou Yujie , Luo Dongxiang , Li Zeyu 
Published: October 2024

Abstract
The fusion of visual and inertial measurements in robotics community is growing in popularity since both of them have complementary perceptual information. Pre-initializing gyroscope bias and accelerometer bias of the inertial measurement unit (IMU) is a critical issue to achieve a better fusion performance, and the metric scale is another crucial element to be estimated. Current mainstream loosely-coupled initialization methods are unstable as they do not incorporate IMU information into the visual structure from motion. In addition, the accuracy of the tightly-coupled methods is limited since they do not use visual observations to compensate gyroscope bias and usually ignore them in close-form solution. In this paper, a visual-inertial (VI) initialization method which we refer to as epipolar plane normal vectors coplanarity constraint (EPVC) method is proposed to solve gyroscope bias. A step further, a novel analytical solution is presented to optimize other parameters. Comparing the proposed method with VI navigation systems-mono and inertial-only optimization through the publicly available EuRoC dataset, the results demonstrate that the proposed method outperforms the existing methods in estimating the gyroscope bias and scale, and with the increase of initialization time, the accelerometer bias error and gravity direction error have a clear diminishing tendency.
Delamination inspection in composite laminates with S0 Lamb wave using flexible macro-fiber composite transducers
Authors: Kou Xing , Casciaro Emanuele , Qian Cheng , Pei Cuixiang , Bettini Paolo 
Published: October 2024

Abstract
Delamination in composite laminates poses a serious threat to structural integrity in aerospace applications due to its potential to cause structural failure. Effective structural health monitoring methods are needed to identify such damage. The objective of this paper is to measure and localize delamination in a glass fiber reinforced polymer cross-ply composite laminate based on the S0 Lamb wave detection method, using the macro-fiber composite (MFC) as both actuator and receiver. To analyze the interaction behaviors between the excited S0 Lamb wave and delamination, the finite element models were established to simulate the Lamb wave propagation in composites, incorporating the local stiffness reduction method to model the delamination region. The simulation results indicate that the interaction behaviors between the excited S0 wave and the delamination occur mainly at the end of the delamination, and the generated new wave packets in the received signals can be used to identify the delamination. Furthermore, the S0 wave reflected from the end edge of delamination was used to localize the delamination. Reflection coefficients were found to vary significantly with delamination depth, and the delamination’s longitudinal position was accurately localized using time-of-flight extraction. Finally, a pitch-catch experiment with MFC transducers was conducted to detect an artificial delamination, demonstrating that it is a promising approach to inspect delamination accurately with end-edge reflected waves.
The advantages of employing i-a-SiOX:H as a buffer layer in hydrogenated amorphous silicon oxide solar cells
Authors: Belabbas Tayeb Youcef , Belfar Abbas 
Published: October 2024

Abstract
This study focuses on a p-i-n single junction solar cell made of hydrogenated amorphous silicon oxide (a-SiOx:H), aiming to enhance solar cell efficiency by mitigating the impact of discontinuities and mismatches occurring at the i/p defect-rich interface between the window layer and the absorber layer. To address this concern, the impact of adding a thin i-a-SiOx:H buffer layer between the p-a-SiOx:H window layer and the i-a-SiOx:H active layer was investigated through numerical modeling using the AMPS-1D (Analysis of Micro-electronic and Photonic Structures) computer program. Implementing these changes led to a remarkable increase in conversion efficiency, rising from 5.714% to an impressive 8.929%. The increase in short-circuit current (JSC), however, is due to improved quantum efficiency at short wavelengths between 350 and 550 nm. Furthermore, enhancing the built-in potential (Vbi) at the i/p interface, combined with the buffer layer’s appropriate band gap energy, increases VOC (open-circuit voltage) from 850 to 993 mV. The substantial improvement in the fill factor (FF) from 63.1 to 83.1% can be largely attributed to the smoothed band offset, primarily facilitated by the presence of the buffer layer at the p/i interface, which led to more efficient extraction of photogenerated holes. To ensure effective usage of the buffer layer, the thickness of a-SiOx:H (buffer layer) varied between 3 nm and 9 nm, while the p-type doping concentration of the same layer was adjusted between 0 and 1020 cm−3. In summary, adding a 3 nm thick a-SiOx:H buffer layer with an intermediate band gap and with a p-type doping concentration (NA) below 1018 cm−3 at the i/p interface improves the electrical and optical properties of the p-i-n solar cells (EFF = 8.951%; VOC = 0.994 V; FF = 83.1%; JSC = 10.842 mA.cm−2).
Design and error analysis of simple terahertz high birefringence microstructured fiber
Authors: Xu Lei-Lei , Yan De-Xian , Li Xiang-Jun , Zhang Le , Sun Shuai , Li Ji-Ning 
Published: October 2024

Abstract
High birefringence fibers are significant in the terahertz technology field, serving as waveguides for terahertz transmission. They are applicable in various fields such as communication, imaging. Integrating metal microstructures into polymer microstructured optical fibers can effectively modulate the transmission characteristics of the fiber, enhancing birefringence and reducing loss, thereby achieving better performance compared to traditional single-material fibers. This paper presents a structurally simple terahertz high birefringence microstructured fiber, where the introduction of gold microstructures enhances the birefringence of fiber, with a maximum birefringence of up to 1.089 × 10−2. We also discuss several manufacturing errors that may occur during the fiber fabrication process. The results indicate that the designed fiber exhibits significant manufacturing tolerance. Variations in the thickness and angle of the gold microstructures, as well as the angular offset of the elliptical cladding wall, peak-to-valley errors, and changes in the aspect ratio of the elliptical tube, have relatively minor effects on the overall transmission performance. The research findings provide insights for designing subsequent high birefringence terahertz fibers, thereby propelling advancements in this field. They offer a theoretical basis for the preparation of related microstructured fiber structures and provide valuable understanding for optimizing fiber manufacturing processes.
Thermal stability and anti-ablation performance of plasma spray coated-YSZ on Al2TiO5 modified novel ablative carbon-phenolic composites
Authors: Basingala Praveen Kumar , Neigapula Venkata Swamy Naidu 
Published: October 2024

Abstract
Despite ongoing challenges, ablative thermal protection systems (TPS) are among the most promising methods for safeguarding spacecraft during re-entry. The polyacrylonitrile (PAN)-based carbon fiber fabric(C)-reinforced with resorcinol phenol formaldehyde resin (RF) composites (C-RF) can be a potential candidate for TPS applications. This study investigates the influence of aluminium titanate (Al2TiO5/AT) and a highly efficient thermal barrier of coating (TB/TBCs) of yttria-stabilized zirconia (YSZ) powder on the thermal and ablative performance of the composites. The composites were prepared by compression moulding and YSZ was coated using plasma spray technique. Composites were produced with varying wt% of AT. Thermal stability and ablation performance of unmodified C-RF with modified YSZ-C-RF and YSZ-AT-C-RF composites were examined through thermogravimetric analysis (TGA) and oxyacetylene torch (OAT) test (4.0 MW m−2 for 60 s). Also, the phase composition and microstructure of the ablated surface were determined by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) techniques. The mass and linear ablation rates (MAR and LAR) of the composites after modifying the surface by YSZ-coatings were reduced. Furthermore, upon the introduction of AT particles and TBC of YSZ results in evidence of improving the thermal stability and the ablation resistance. The addition of 1 wt% AT particles and coating of YSZ have reduced MAR and LAR by 54.79% and 61.94%, respectively. This work offers a meaningful method to remarkably enhance the ablation performance of the modified C-RF and YSZ-AT-C-RF composites and can potentially find their application in aerospace industry.
Quantum circuit syntheses of Boolean matrix multiplication using only CNOT gates
Authors: Zheng Yuanmeng , Luo Qingbin , Li Qiang , Lv Yi , Liao Haoyu , Ding Lang , Shen Jinan 
Published: October 2024

Abstract
Boolean matrices and operations on Boolean matrices have become increasingly popular in quantum computing and quantum information because they can be used to represent quantum states and the corresponding operations. In this paper, we first give a quantum circuit direct synthesis of general Boolean matrix multiplication using Toffoli gates. We assign a qubit to each element of the matrix and add Toffoli gates at the corresponding positions where the matrix elements are multiplied according to the arithmetic of matrix multiplication. For n × p dimensional matrix A multiplied by p × m dimensional matrix B, np + pm + nm qubits and at most pmn Toffoli gates are used in total. Then, an improved heuristic algorithm based on matrix Hamming distance selection of CNOT gate is proposed to synthesize the quantum circuit of a matrix, without using wire switching and SWAP gates, using only CNOT gates. The results show that our method is as good as or better than the classical synthesis. Finally, the quantum circuit of Boolean matrix multiplication with at least one invertible or full-rank matrix using only CNOT gates is given, which is divided into five cases for discussion and analysis. For n × n dimensional invertible matrix A multiplied by n × m dimensional matrix B, nm qubits and at most mn
2 CNOT gates are used in total. For n × p dimensional column full-rank matrix A multiplied by p × m dimensional matrix B, nm qubits and at most pmn CNOT gates are used in total. The results show that this method uses less quantum resources to synthesize the quantum circuit of Boolean matrix multiplication. The correctness of the quantum circuits was verified by the Aer simulator of the IBM Quantum platform.
Fatigue and Autofrettage Analysis of Steel Sleeve Based on Precision Fit under Ultra High Pressure
Authors: Li Shangqing , Zhang Chunguang , Wu Ye , Wang Yu , Yu Xiaochen , An Lei 
Published: October 2024

Abstract
In order to ensure precision fit between steel sleeve and plunger, copper sleeve and the other parts of the ultra high pressure plunger pump, as well as increase the fatigue life of steel sleeve, this paper made the analysis of work process and fatigue life of ultra high pressure autofrettage steel sleeve of plunger pump based on both analytical method and FEM. The elastic-plastic boundary radius, radial stress and plastic zone displacement were obtained based on the elastic-plastic mechanics analysis of ultra high pressure steel sleeve. The functional relationship built related to precision fit among autofrettage pressure, inner diameter expectation and displacement could ensure the machining dimension of inner diameter of steel sleeve and realize the precise control of inner diameter of steel sleeve. The analytical method and FEM for calculating fatigue life was also proposed, which are verified by experiment. The research shows that machining dimension is determined by inner diameter expectation in the autofrettage process to ensure precision fit; autofrettage treatment can reduce the working stress level of the steel sleeve and extend the fatigue life remarkably. These conclusions contribute to guide the design of steel sleeve.
Effect of tensile speeds on mechanical properties of Young’s modulus and Poisson’s ratio of 3D-printed ABS-like specimens
Authors: Kajiwara Shuhei , Yamashita Shun , Matsueda Takahiro , Mizobe Koshiro , Kida Katsuyuki 
Published: October 2024

Abstract
Additive manufacturing (AM) is a well-known method of 3D printers. The AM method forms components by laminating thin layers. Therefore, this method can make prototypes of parts and does not involve any tooling or human interference. However, the mechanical parts made by the AM method have unique problems. In particular, the effect of the strain rate on the mechanical property of Young’s modulus and Poisson’s ratio has not been studied in detail. Therefore, we investigated the effect of strain rates on 3D-printed ABS-like specimens in this study. In order to investigate the effect of tensile speed on 3D-printed ABS-like specimens, tensile tests were conducted at 0.2 mm/min, 2 mm/min, 60 mm/min, 800 mm/min, and 1000 mm/min. We obtained the experimental results that Young’s modulus increased with increasing tensile speed. Also, the specimen broke at multiple points in high-speed tensile tests. Poisson’s ratio values for all tensile speeds were almost constant around 0.38.
High Temperature Oxidation Behaviours of NiCoCrAlY alloys with High Al Content
Authors: Zhang Jin , Ji Renyi , Nie Zhihua , Ning Xianjin , Mu Rende , Tan Chengwen 
Published: October 2024

Abstract
MCrAlY coatings are of paramount importance in the protection of hot-end components from thermal oxidation and corrosion. The Al content is a crucial factor in enhancing the oxidation resistance properties of the coatings. This paper studies the oxidation behaviors of Ni-27.5Co-17Cr-xAl-0.5Y (x = 12 and 16 wt.%) alloys with high Al content. Following an oxidation process at 1100 °C over a period of 100 h, both alloys exhibit the oxide scales primarily consist of Al2O3 with minor amount of Co(Ni)Al2O4 spinels. The increased Al content results in a higher proportion of β phase, thereby promoting the development of an oxide scale in response to thermal exposure. This study provides insights into the fabrication of high Al content MCrAlY coatings with potential applications in next-generation thermal barrier coatings.
Effect of Cold Rolling on the Microstructure and High Temperature Properties of 310S Heat-resistant Steel
Authors: Zhongyuan Zhao , You Yang , Zhenxin Duan , Xiaolei Song , Jingshi Zhang 
Published: October 2024

Abstract
The microstructure and high temperature properties of 310S heat-resistant steel were investigated before and after cold rolling with a deformation rate of 10% by using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometer (XRD) and tensile testing machine.The results showed that the microstructure of 310S heat-resistant steel remains unchanged with no formation of any new phase observed after cold rolling. The hardness is enhanced from 305.4HV prior to cold rolling to 321.6HV post cold rolling, exhibiting an augmentation of 16.2HV. The 310S heat-resistant steel is carried out a cold-rolling process with a deformation of 10% in the room temperature tensile test. The tensile strength exhibits an increase from 776.6MPa to 806.3MPa, with a difference of 29.7MPa.The yield strength has experienced a significant increase, from 554.4MPa to 679.6MPa, representing a substantial increment of 125.2MPa.The elongation decreased by 20.2%, from 61.9% to 41.7%, after cold rolling. The 310S heat-resistant steel with 0% deformation appears superplasticity at 750°C. The elongation rate reaches 113.1%. The 310S heat-resistant steel with 0% deformation appears fracture oxidation at 800°C. In the process of 700°C to 800°C, the tensile strength of 310S heat-resistant steel with 0% deformation is reduced by 101.9MPa, and the tensile strength of 310S heat-resistant steel with 10% deformation is reduced by 90.9MPa.
Facile synthesis of Fe3O4/Ti3C2Tx MXene/RGO aerogels with broadband microwave absorption and thermal insulation performance
Authors: Cheng Xin , Liu Xingmin , Wang Jijie , Hua Yutuo 
Published: October 2024

Abstract
The development of microwave absorbing materials with attributes such as low weight, broad absorption bandwidth, and superior thermal insulation performance is still challenging. In this study, Fe3O4 nanoparticles were anchored on Ti3C2Tx MXene/RGO nanosheets by one-step hydrothermal gelation method to prepare Fe3O4/Ti3C2Tx MXene/RGO (FeMR) hybrid aerogels. Perfect impedance matching and electromagnetic coupling effect were achieved by adjusting the composition ratio of FeMR aerogels, so exceptionally outstanding microwave absorption performance was obtained. FeMR aerogel at 2.90 mm thickness, effective absorption bandwidth (EAB) up to 8.10 GHz. Simultaneously, FeMR aerogels have has good thermal insulation performance. After heating at 300°C for 60 min, the aerogel can still isolate the thermal radiation of about 155 °C. This work demonstrates a simple method for preparing lightweight, broadband electromagnetic wave absorption and heat insulation three-dimensional MXene-based aerogels, which provides inspiration for the structural design and potential applications of EWA materials.
Effect of pre-strain on dynamic mechanical properties of Ti-6Cr-5Mo-5V-4Al titanium alloy
Authors: He Shulin , Li Rui , Xiao» Kaikai , Li Changheng , Yu Yang 
Published: October 2024

Abstract
The effect of quasi-static pre-deformation on the dynamic properties of Ti-6Cr-5Mo-5V-4Al titanium alloy was studied. The results revealed that as the pre-tension deformation increased, the average dynamic flow stress was slightly decreased while the dynamic uniform plastic strain and the maximum absorbed energy were improved obviously and the largest value existed when the deformation reached 6.8%. As the pre-tension deformation progressively increased, the dynamic performance exhibited a marked decline. Conversely, with the increase of the pre-compression deformation, the dynamic flow stress experienced a substantial enhancement, but the dynamic uniform plastic and the maximum absorbed energy significantly declined which showed that the pre-compression deformation did harm to the dynamic mechanical properties of Ti-6Cr-5Mo-5V-4Al titanium alloy.