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Reconstruction of power spectrum of primordial curvature perturbations on small scales from primordial black hole binaries scenario of LIGO/VIRGO detection

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science China(Physics,Mechanics & Astronomy) 2023年第6期66卷 87-93页

作者： Xinpeng Wang Ying-li Zhang Rampei Kimura Masahide Yamaguchi School of Physics Science and Engineering Tongji UniversityShanghai200092China Institute for Advanced Study of Tongji University Shanghai200092China Kavli Institute for the Physics and Mathematics of the Universe(WPI) Chiba277-8583Japan Center for Gravitation and Cosmology Yangzhou UniversityYangzhou225009China Waseda Institute for Advanced Study Waseda UniversityTokyo169-8050Japan Department of Physics Tokyo Institute of TechnologyTokyo152-8551Japan

As a candidate bound for the Binary Black Hole(BBH) merger events detected by LIGO/Virgo, Primordial Black Holes(PBHs)provide a useful tool to investigate the primordial curvature perturbations on small scales. Using the GWTC-1 to GWTC-3 catalogs, under the scenario that PBHs originate from large primordial curvature perturbations on small scales during infiationary epoch, we for the first time reconstruct the power spectrum of primordial curvature perturbations on small scales. It is found that the value of the amplitude of the primordial power spectrum is enhanced to O(10-2)on scales O(1) pc. This may imply the validity of PBH as a possible BBH merger candidate.

关键词： primordial black hole primordial curvature perturbation gravitational wave inflation

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Effective numerical simulations of synchronous generator system (FEB, 10.1177/00375497241231986, 2024)

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SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION INTERNATIONAL 2024年第6期100卷 639-639页

作者： Zhang, J. Zhu, A. Ji, F. Lin, C. Tang, Y. LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences China School of Mathematical Sciences University of Chinese Academy of Sciences China State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd China

Synchronous generator system is a complicated dynamic system for energy transmission, which plays an important role in modern industrial production. In this article, we propose some predictor-corrector methods and structure-preserving methods for a generator system based on the first benchmark model of subsynchronous resonance, among which the structure-preserving methods preserve a Dirac structure associated with the so-called port-Hamiltonian descriptor systems. To illustrate this, the simplified generator system in the form of index-1 differential-algebraic equations has been derived. Our analyses provide the global error estimates for a special class of structure-preserving methods called Gauss methods, which guarantee their superior performance over the PSCAD/EMTDC and the predictor-corrector methods in terms of computational stability. Numerical simulations are implemented to verify the effectiveness and advantages of our methods.

关键词： Synchronous generator system predictor-corrector method structure-preserving method port-Hamiltonian descriptor system differential-algebraic equations

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MXene ink hosting zinc anode for high performance aqueous zinc metal batteries

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Journal of Energy Chemistry 2023年第1期76卷 187-194,I0005页

作者： Jae Min Park Milan Jana Sang Ha Baek Taehun Kang Peixun Xiong Jeong Hee Park Jun Soo Kim Ali Shayesteh Zeraati Mikhail Shekhirev Paul V.Braun Yury Gogotsi Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea Department of Chemical and Petroleum Engineering University of Calgary2500 University Dr NWCalgary T2N 1N4Canada Department of Materials Science and Engineering Materials Research LaboratoryBeckman Institute for Advanced Science and TechnologyUniversity of Ilinois at Urbana-ChampaignUrbanaIL61801USA A.J.Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel UniversityPhiladelphiaPA 19104USA SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University 2066SeoburoJangan-guSuwon 440-746Republic of Korea

Despite the safety,low cost,and high theoretical capacity(820 mA h g^(-1))of Zn metal anodes,the practical application of aqueous Zn metal batteries remains a critical challenge due to the Zn dendrite growth,corrosion,and hydrogen evolution ***,we demonstrate the MXene ink hosting Zn metal anodes(MX@Zn)for high-performance and patternable Zn metal full *** as-designed MX@Zn electrode is more facile and reversible than bare Zn and CC@Zn,as verified by better cyclic stability and lower overpotentials of symmetric cells with the plating capacity of 0.05 mA h cm^(-2)at 0.1 m A cm^(-2)and of 1 m A h cm^(-2)at 1 m A cm^(-2).The MX@Zn|MnO_(2)full cells deliver a high specific capacity of 281.9 m A h g^(-1),91.5%of the theoretical capacity,achieving 50%capacity retention from 60 mA g^(-1)to 300 mA g^(-1)and 79.7%of initial capacity after 200 ***,the patterned devices based on the MX@Zn electrode achieve high energy and power densities of 348.57 Wh kg^(-1)and 1556 W kg^(-1),respectively,along with a capacity retention of 64%and Coulombic efficiency of 99%over 500 *** high performance of MX@Zn is attributed to the high electrical conductivity and hydrophilicity of MXene and rapid ion diffusion through the 3D interconnected porous channels.

关键词： MXene ink Zinc anode Metal batteries Patterning Electrodeposition

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Research on Fault Localization for Cable-Overhead Line Hybrid Transmission System Based on Sheath Current 4

Research on Fault Localization for Cable-Overhead Line Hybri...

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4th International Conference on New Energy and Power Engineering, ICNEPE 2024

作者： Zhang, Yaodong Ren, Xiang Huang, Zeqi Xu, Haotian Liu, Ruiqi Lin, Fuchang Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Hubei Wuhan430077 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Province Wuhan430074 China Huazhong University of Science and Technology Ministry of Education Key Laboratory of Pulsed Power Technology China

ISBN: (纸本)9798331516086

With the development of the power grid, the application of overhead line-cable hybrid transmission lines has become increasingly widespread. However, there has been limited research on fault localization methods for such lines. In this paper, we propose a method for differentiating quickly whether a fault occurs in the overhead line or the cable line segment when a single-phase short-circuit fault occurs in hybrid lines. This method combines the amplitude and phase of the sheath currents. It also locates the fault within the range of the cross-bonded cable subsection. © 2024 IEEE.

关键词： Overhead lines

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Influence of Alloying Elements Content on High Temperature Properties of Ti-V-Cr and Ti-Al-V Series Titanium Alloys: A JMatPro Program Calculation Study

Influence of Alloying Elements Content on High Temperature P...

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Chinese Materials Conference 2022-2023

作者： Sun, Ruochen Mi, Guangbao Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing100095 China

For the issues of high temperature performance affected by the alloying elements content in Ti-V-Cr and Ti-V-Cr alloys, the thermodynamic calculation method based on JMatPro program was applied in this study. The research is mainly focused on the analysis of phase composition, thermodynamic parameters and mechanical properties of Ti-Al-V and Ti-V-Cr series alloys with different element proportions under high temperature environment. Those obtained results show that the proportion of Al in Ti-Al-V alloys has a great influence on the high temperature properties. Increasing the content of Al not only increases the transformation temperature of β single-phase structure and delays the transformation process of α/β microstructure to β single-phase structure, but also helps to improve the high temperature thermal conductivity and elastic deformation resistance of the alloy. In Ti-V-Cr alloys, the influence of V element on high temperature properties is mainly focused on the improvement of thermal conductivity and high temperature deformation properties, while the influence of Cr element is relatively weak. Besides, adding a small amount of Al element to Ti-V-Cr alloy can further improve the thermal conductivity of the alloy. The Young's modulus of the Ti-V-Cr alloy increases when 0.3%-1% of C element is added. Finally, the effect of Si element on the high temperature elastic deformation of the alloy is relatively weak. © Published under licence by IOP Publishing Ltd.

关键词： Titanium alloys

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Design and Preparation of Ultra-Thin Conformal Shielding Coatings with Sandwich Structure for System in Packaging (SiP)

Design and Preparation of Ultra-Thin Conformal Shielding Coa...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Xuelong Zhang Hao Wu Baotan Zhang Rong Sun Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Nano Science and Technology Institute University of Science and Technology of China Shenzhen China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

In this study, we designed and printed an ultra-thin conformal shielding coating with a sandwich structure using inkjet printing, and studied the effects of resistivity, the number of conductive layers, and the thickness and type of dielectric layers on shielding performance. The results demonstrated that the shielding effectiveness of the sandwich structure coating can reach up to 95dB, which is 8–10dB greater than that of a single metallized shielding layer. At the same time, it was found that its overall thickness did not exceed 6 µm. These studies will provide a reference and basis for the design and preparation of thinner and more effective shielding coatings.

关键词： Packaging Conductivity Dielectrics Ink jet printing Coatings Electromagnetic shielding Sandwich structures

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Enhancement of osteogenic potential and surface wettability of polycaprolactone using hydroxyapatite co-doped with vanadium and yttrium

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Ceramics International 2025年第15期51卷 20575-20594页

作者： Megha, M. Joy, Anjumol Mohan, Chandni C. Unnikrishnan, Gayathri Thomas, Jibu Haris, M. Bhatt, Sarita G. Kolanthai, Elayaraja Muthuswamy, Senthilkumar Department of Physics Karunya Institute of Technology and Sciences Coimbatore India College of Engineering Abu Dhabi University Abu Dhabi United Arab Emirates Department of Biotechnology Cochin University of Science and Technology Kochi India Department of Biotechnology Karunya Institute of Technology and Sciences Coimbatore India Department of Applied Physics School of Arts and Natural Sciences Joy University Tirunelveli India Department of Materials Sciences and Engineering Advanced Materials Processing and Analysis Centre University of Central Florida OrlandoFL United States

Although advanced composites are becoming more common in therapeutic applications, there is still a significant need for materials that combine improved mechanical properties with biological functionality for successful bone tissue engineering. This study aimed to develop a novel polymeric nanocomposite by incorporating vanadium and yttrium co-doped hydroxyapatite (HVY) into a polycaprolactone (PCL) matrix using the solvent casting method. For the first time, rare-earth metal yttrium was co-doped with vanadium to enhance the mechanical and biological performance of polymer composites for bone tissue engineering. The incorporation of HVY significantly improved mechanical strength from 26.30 ± 0.37 MPa to 48.58 ± 0.42 MPa, while enhancing surface hydrophilicity, as evidenced by a reduction in the contact angle from 102.98° to 62.16°. Porosity and degradation studies over 21 days demonstrated a satisfactory and controlled degradation rate suitable for bone regeneration applications. Biomineralization capacity was confirmed through the deposition of calcium and phosphate on the composite surface after immersion in simulated body fluid (SBF). Antibacterial tests revealed potent activity against S. aureus and P. aeruginosa, with inhibition zones of 9.05 ± 0.8 mm and 7.15 ± 0.6 mm, respectively. Hemocompatibility testing indicated a hemolysis rate of less than 5 %, while over 80 % viability of rat bone marrow-derived stromal cells (rBMSC) confirmed the non-toxic nature of the composites. Osteogenic differentiation assays, including ALP and ARS, showed outstanding performance, suggesting the significant potential of the prepared material for promoting bone development and regeneration. This study bridges a critical gap in the development of biomaterials by introducing a rare-earth metal co-doping strategy, providing a promising biomaterial for bone tissue engineering applications. The findings underscore its potential as a highly effective, easily fabricated biomaterial tha

关键词： Yttrium

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Thermally Oxidized AlxGa2-xO3/n-Al0.6Ga0.4N:Si Unipolar Resistive Random-Access Memory

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ACS Applied Electronic Materials 2024年第5期6卷 3688-3694页

作者： Wang, Tien-Yu Lai, Wei-Chih Xie, Qiao-Ju Chang, Sheng-Po Kuo, Cheng-Huang Sheu, Jinn-Kong Department of Photonics National Cheng Kung University Tainan70101 Taiwan Advanced Optoelectronic Technology Center Research Center for Energy Technology and Strategy National Cheng Kung University Tainan70101 Taiwan Department of Microelectronics Engineering National Kaohsiung University of Science and Technology Kaohsiung81157 Taiwan Institute of Lighting and Energy Photonics College of Photonics National Yang Ming Chiao Tung University Tainan71150 Taiwan

Thermally oxidized AlxGa2-xO3/n-Al0.6Ga0.4N:Si resistive random access memory (RRAM) presented unipolar resistive switching characteristics. The resistance ratio of the high-resistance state (HRS) to the low-resistance state (LRS) was higher than 104 for the RRAM device. After a retention time of 10000 s, the ratio of HRS/LRS exhibited no obvious degradation. The thickness of the Ti layer on the top electrode affected the switching cycles of the RRAM. The resistive switching cycles increased from 17 to 45 times with increasing Ti thickness from 1 to 5 nm. In addition to the effect of Ti thickness, the oxygen (O2) plasma treatment on the thermally oxidized AlxGa2-xO3 layer improved the resistive switching cycles of the RRAM. The resistive switching cycles increased from 45 to 165 times with increasing the O2 plasma treatment time from 0 to 90 min. Ti formed a TiOx layer, which could act as an oxygen reservoir. Thick Ti and O2 plasma treatment could increase the amount of oxygen in the TiOx layer. Oxygen could be supplied to the conductive filaments for redox reactions, leading to an improvement in the resistive switching cycle of RRAM. © 2024 The Authors. Published by American Chemical Society

关键词： Gallium compounds

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Influence of different rolling processes on microstructure and strength of the Al–Cu–Li alloy AA2195

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Progress in Natural science:Materials International 2022年第1期32卷 87-95页

作者： Fan Ye Ling Mao Jian Rong Baoshuai Zhang Lijun Wei Sihan Wen Haojun Jiao Sujun Wu International Research Center for Advanced Structural and Biomaterials School of Materials Science and Engineering Beihang University School of Materials Science and Engineering Beihang University Aerospace Research Institute of Materials & Processing Technology

The influence of different rolling processes on precipitation behaviour, crystallography texture, grain morphology,and their consequent effects on tensile properties for Al–Cu–Li alloy AA2195 was investigated in the present *** H-T8 samples(hot rolled + T8) presented better tensile strength and ductility(with serious strength anisotropy) than the HC-T8 samples(hot rolled + cold rolled + T8), due to their different microstructures and textures. The higher dislocation density was found in the H-T8 samples, which promoted the nucleation of main strengthening phase T1in the matrix and suppressed the grain boundary precipitation, resulted in better strength and ductility. The increase of the dynamic recovery(DRV) during hot rolling enhanced the generation of Brass texture, and brought serious strength anisotropy. The cold rolling was performed after the hot-rolling process for the HC-T8 samples which increased deformation energy and resulted in full recrystallization of the deformed microstructure during the following solution treatment. The formation of recrystallized microstructure reduced the dislocation density and the heterogeneous precipitate nucleation positions which limited the strengthening phase precipitation in matrix and accelerated the precipitation along grain boundaries, resulted in fewer T1precipitates, coarse grain-boundary precipitates(GBPs), and wider precipitate-free zones(PFZs). The localized strain may be concentrated on the grain boundary to induce the dislocation pile-up, breaking of the GBPs, and intergranular fracture during stretching.

关键词： Al-Cu-Li alloys Rolling Mechanical properties Microstructure evolution Fracture

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Improving Hybrid Model Accuracy for Structural Analysis: The Effects of Parameterized Joint Stiffness on System Equivalent Model Mixing 14

Improving Hybrid Model Accuracy for Structural Analysis: The...

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14th International Workshop on Structural Health Monitoring: Designing SHM for Sustainability, Maintainability, and Reliability, IWSHM 2023

作者： Park, Kang-Jae Park, Yong-Hwa Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 291 Daehak-ro Yuseong-gu Daejeon Korea Republic of

ISBN: (纸本)9781605956930

System equivalent model mixing (SEMM) is a hybrid model that integrates experimental data and numerical analysis to obtain an unmeasured degree-of-freedom (DoF). SEMM extends the frequency response functions obtained from experimental data to a finite element method (FEM) model, resulting in a highly accurate and precise hybrid model that enables the measurement of joint behavior and characteristics. By leveraging the precision of experimental data and the expansion of numerical models, SEMM can acquire frequency response functions from inaccessible joints. This approach provides researchers with more complete information on joint behavior and characteristics than traditional modeling approaches that rely solely on either experimental or numerical data, allowing for more accurate and comprehensive analysis. A common method for implementing SEMM involves using a virtual point transformation (VPT) that accounts for the rotational degrees of freedom of the joint by employing three tri-axial sensors near the joint, or by attaching a transmission simulator (TS) to the joint to mitigate the influence of rotational degrees of freedom. However, the accuracy of the expansion DoF using SEMM is determined not only by the initial boundary condition of the analytical model but also by the boundary condition error between the experiment and the analytical model. Therefore, the accurate establishment of system boundary conditions in the numerical model is crucial for SEMM modeling to improve the reliability and correctness of the resulting hybrid model. This paper describes the development of hybrid models for structural analysis by incorporating parameterized joint stiffness to optimize boundary conditions in numerical models and enhance the accuracy of the resulting hybrid models. The accuracy of the proposed approach based on SEMM is evaluated using the frequency response assurance criterion (FRAC). The results show that the FRAC is sensitive to changes in boundary stiffness an

关键词： Boundary conditions

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