检索结果-内蒙古大学图书馆

AIAA science and technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Hatashita, Luis H. Jain, Suhas S. Daniel Guggenheim School of Aerospace Engineering Flow Physics and Computational Science Lab Georgia Institute of Technology 270 Ferst Drive NW Atlanta30332 Georgia George W. Woodruff School of Mechanical Engineering Flow Physics and Computational Science Lab Georgia Institute of Technology 801 Ferst Drive NW Atlanta30332 Georgia

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Classical diffuse interface methods for non-equilibrium formulations of two-phase flows are not capable of preserving interface-thickness. Furthermore, when coupled with shockcapturing schemes, the interface may diffuse in its entirety. Thus, it is of utmost importance for accurate simulation of two-phase flows to describe interface-preserving formulations. Herein, a conservative interface-regularization formulation based on the phase-field method is proposed, and it analytically guarantees boundedness of volume fraction, absence of spurious oscillations of phasic kinetic energy and mixture entropy preservation in the absence of relaxation. The formulation is shown to stabilize dispersion errors originated due to the interface jumps and to preserve interface thickness when discretized with low lost and low dissipation second-order schemes. A possible issue with this formulation and discretization is the possibility of failing to preserve positivity of quantities of interests, hence, a blending strategy with a Lax-Friedrichs flux is also proposed and tested. In highly compressible scenarios such as shock-drop interaction, the interface regularization when applied to the positive-preserving flux is demonstrated to improve qualitative results on coarser grids. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Kinetic energy

来源：评论

学校读者我要写书评

暂无评论

Delineation of profoundly birefringent nonlinear photonic crystal fiber in terahertz frequency regime

引用

Journal of Optical Communications 2025年第1期46卷 41-49页

作者： Yadav, Sapana Singh, Sachin Lohia, Pooja Umar, Ahmad Dwivedi, Dilip Kumar Photonics and Photovoltaic Research Lab Department of Physics and Material Science Madan Mohan Malaviya University of Technology Gorakhpur273010 India Department of Electronics and Communication Engineering Madan Mohan Malaviya University of Technology Gorakhpur273010 India Najran University Najran11001 Saudi Arabia Department of Materials Science and Engineering The Ohio State University Columbus OH43210 United States

The photonic aspects of semiconducting hexagon-shaped photonic crystal fiber including effective mode area, effective mode index, dispersion, and confinement loss, have already been investigated. The finite element method has been used to compute the maximum distribution of the studied photonic crystal fiber by COMSOL software. The linear modifications from both the effective mode index and an effective mode area have been investigated. Dispersion and confinement loss are examined in terms of air hole ring number and wavelength. For every wavelength, the effective-index model implies that the studied fiber can indeed be single mode. Even though its practical single-mode range inside the opacity aperture of silica appears large, it is eventually confined by a bend-loss edge at both brief & medium wavelengths. Moreover, the reported fiber offers minimal confinement loss of almost 10-8 dB/cm, birefringence 0.0012, and dispersion around 10-11 ps/km nm. © 2022 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Birefringence

来源：评论

学校读者我要写书评

暂无评论

Robust A1 superconductivity in the kagome lattice

引用

Physical Review B 2024年第21期109卷 214501-214501页

作者： Yi Gao Center for Quantum Transport and Thermal Energy Science Jiangsu Key Lab on Opto-Electronic Technology School of Physics and Technology

We theoretically studied the superconducting pairing in a single-orbital kagome lattice. By taking the electron-electron correlation as the pairing mechanism, we obtained the spin and charge fluctuations based on the random-phase approximation and calculated the preferred pairing function based on the linearized Eliashberg equation. It turns out that the frequency dependence of the Eliashberg equation is of great importance in this model, and may lead to spin-triplet and odd-frequency pairing state. We further found a robust A1 pairing symmetry, with respect to the correlation strength and Fermi surface variation. This pairing state does not break the time-reversal symmetry and can be nodal or nodeless. We concluded that, in the recently discovered kagome superconductors, the preferred pairing symmetry is A1, even if the pairing originates from the electron-electron interaction.

关键词： Electron-mediated pairing Odd-frequency superconductivity Kagome lattice Eliashberg theory

来源：评论

学校读者我要写书评

暂无评论

Coupling Co-Ni phosphides for energy-saving alkaline seawater splitting

引用

Nano Research 2024年第6期17卷 4797-4806页

作者： Weijia Liu Wenxian Liu Tong Hou Junyang Ding Zhigui Wang Ruilian Yin Xingyuan San Ligang Feng Jun Luo Xijun Liu State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured MaterialsMOE Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Hebei Key Laboratory of Optic-electronic Information and Materials the College of Physics Science and TechnologyHebei UniversityBaoding 071002China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China

The coupling of energy-saving small molecule conversion reactions and hydrogen evolution reaction(HER)in seawater electrolytes can reduce the energy consumption of seawater electrolysis and mitigate chlorine corrosion ***,the fabrication of efficient multifunctional catalysts for this promising technology is of great ***,a heterostructured catalyst comprising CoP and Ni_(2)P on nickel foam(CoP/Ni_(2)P@NF)is reported for hydrazine oxidation(HzOR)-assisted alkaline seawater *** coupling of CoP and Ni_(2)P optimizes the electronic structure of the active sites and endows excellent electrocatalytic performance for HzOR and ***,the two-electrode HzOR-assisted alkaline seawater splitting(OHzS)cell based on the CoP/Ni_(2)P@NF required only 0.108 V to deliver 100 mA·cm^(−2),much lower than 1.695 V for alkaline seawater electrolysis ***,the OHzS cell exhibits satisfactory stability over 48 h at a high current density of 500 mA·cm^(−2).Furthermore,the CoP/Ni_(2)P@NF heterostructured catalyst also efficiently catalyzed glucose oxidation,methanol oxidation,and urea oxidation in alkaline seawater *** work paves a path for high-performance heterostructured catalyst preparation for energy-saving seawater electrolysis for H_(2) production.

关键词： seawater splitting heterostructure electrocatalysis hydrazine oxidation reaction hydrogen evolution reaction

来源：评论

学校读者我要写书评

暂无评论

Coordination and interface engineering to boost catalytic property of two-dimensional ZIFs for wearable Zn-air batteries

引用

Journal of Energy Chemistry 2022年第5期31卷 78-86页

作者： Hang Lei Shangjing Yang Qixiang Wan Liang Ma Muhammad Sufyan Javed Shaozao Tan Zilong Wang Wenjie Mai Guangdong Engineering&Technology Research Centre of Graphene-Like Materials and Products Department of ChemistryCollege of Chemistry and Materials ScienceJinan UniversityGuangzhou 510632GuangdongChina Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina School of Physical Science and Technology Lanzhou UniversityLanzhou 730000GansuChina

Metal organic frameworks(MOFs) have been considered as compelling precursor for miscellaneous applications. However, their unsatisfied electrocatalytic performance limits their direct application as electrocatalyst. Herein, by incorporating the cobalt-oxide bonds and polyaniline(PANI) with two-dimension zeolitic imidazolate frameworks(ZIFs), a novel bifunctional catalyst(Co-O-ZIF/PANI) for Zn-air battery was designed based on a facile and eco-friendly method. This Co-O-ZIF/PANI with optimized surface adsorption effect and suitable Co^(3+)/Co^(2+)ratio, exhibits eminent electrocatalytic activity toward both oxygen reduction and evolution reaction. The as-assembled liquid ZABs based on Co-O-ZIF/PANI achieves a remarkable maximum power density of 123.1 m W cm^(-2) and low discharge-charge voltage gap of 0.81 V at 5 m A cm^(-2) for over 300 cycles. Operando Raman spectroscopy reveals that the excellent performance origins from the optimized surface chemisorption property of O_(2) and H_(2)O brought by Co–O bonds and PANI. This work provides a novel prospect to develop efficient MOF derived bifunctional electrocatalysts by optimizing surface chemisorption properties.

关键词： Zn-air batteries Wearable batteries Bifunctional electrocatalyst Operando Raman Zeolitic imidazolate frameworks

来源：评论

学校读者我要写书评

暂无评论

Design of wavelength-locking module for VCSEL

Design of wavelength-locking module for VCSEL

引用

International Conference on Mechanical Engineering, Measurement Control, and Instrumentation 2021

作者： Lin, Jing Dong, Pengling Wang, Shijia Cai, Zhiwei Zhang, Jinhai Lian, Jiqing Lanzhou Institute of Physics Lip China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou China

ISBN: (数字)9781510647299

ISBN: (纸本)9781510647282

Aiming at the wavelength locking of vertical cavity surface emitting lasers (VCSEL), the principle of atomic transition spectrum locking based on low frequency modulation and demodulation was analyzed, and the laser wavelength locking circuits were designed and realized by using digital phase detection algorithm. VCSEL wavelength locking circuits were mainly composed of temperature control circuit, laser driven current source and digital phase detector, and the principle design of each circuit was given respectively. The designed VCSEL wavelength locking circuits have been tested and successfully applied to coherent population trapping (CPT) atomic clock, locked the multi-spectrum of 133Cs and realized the observation of CPT signal. © 2021 SPIE.

关键词： Surface emitting lasers

来源：评论

学校读者我要写书评

暂无评论

Ultrafast multi-target control of tightly focused light fields

引用

Opto-Electronic Advances 2022年第3期5卷 76-87页

作者： Yanxiang Zhang Xiaofei Liu Han Lin Dan Wang Ensi Cao Shaoding Liu Zhongquan Nie Baohua Jia Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China Department of Physics Harbin Institute of TechnologyHarbin 150001China Centre of Translational Atomaterials(CTAM) Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia

The control of ultrafast optical field is of great interest in developing ultrafast optics as well as the investigation on vari-ous light-matter interactions with ultrashort ***,conventional spatial encoding approaches have only lim-ited steerable targets usually neglecting the temporal effect,thus hindering their broad *** we present a new concept for realizing ultrafast modulation of multi-target focal fields based on the facile combination of time-depend-ent vectorial diffraction theory with fast Fourier *** is achieved by focusing femtosecond pulsed light carrying vectorial-vortex by a single objective lens under tight focusing *** is uncovered that the ultrafast temporal de-gree of freedom within a configurable temporal duration(~400 fs)plays a pivotal role in determining the rich and exotic features of the focused optical field at one time,namely,bright-dark alternation,periodic rotation,and longitudinal/trans-verse polarization *** underlying control mechanisms have been *** being of academic in-terest in diverse ultrafast spectral regimes,these peculiar behaviors of the space-time evolutionary beams may underpin prolific ultrafast-related applications such as multifunctional integrated optical chip,high-efficiency laser trapping,micro-structure rotation,super-resolution optical microscopy,precise optical measurement,and liveness tracking.

关键词： ultrafast optical field vectorial diffraction theory fast Fourier transform vectorial vortex beam space-time shaping

来源：评论

学校读者我要写书评

暂无评论

Research on Single Event Effects of Ethernet MAC Controller on Manned Spacecraft 3

Research on Single Event Effects of Ethernet MAC Controller ...

引用

2020 3rd International Symposium on Power Electronics and Control Engineering, ISPECE 2020

作者： Bo, Zhu Jialiang, Li Hongxiang, Chen Shijia, Wang Xin'An, Qiu Mingyu, Cheng Jiagao, Xia Jiaqi, Gao Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou Gansu730000 China

In order to realize higher speed and large flow network communication on the new manned spacecraft independently developed in China, it is necessary to apply Ethernet technology. Considering the cost and application prospect, it is planned to use industrial Ethernet control chip. So it is necessary to verify whether it can meet the special requirements of the space environment. According to the space environment of the manned spacecraft design orbit, and the sensitive characteristics of the Ethernet controller chip itself, it is necessary to focus on verifying its single-particle effect. This paper introduces in detail the single-event effect of the Ethernet controller in China for the first time. The Bi-ion and Kr ions of the HIRFL cyclotron are used to carry out the single-event effect on the KSZ8851-16MLLJ Ethernet MAC controller produced by MICREL. The evaluation test, including the single-particle test design, hardware platform, software functions and test data, finally gave the test conclusion. © Published under licence by IOP Publishing Ltd.

关键词： Controllers

来源：评论

学校读者我要写书评

暂无评论

Extremely strong coupling s-wave superconductivity in the medium-entropy alloy TiHfNbTa

引用

science China(physics,Mechanics & Astronomy) 2023年第7期66卷 127-135页

作者： Lingyong Zeng Xunwu Hu Mebrouka Boubeche Kuan Li Longfu Li Peifeng Yu Kangwang Wang Chao Zhang Kui Jin Dao-Xin Yao Huixia Luo School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and TechnologiesKey Lab of Polymer Composite&Functional MaterialsGuangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSun Yat-Sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices Center for Neutron Science and TechnologySchool of PhysicsSun Yat-Sen UniversityGuangzhou 510275China Songshan Lake Materials Laboratory University Innovation TownDongguan 523808China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Vacuum Physics School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China

Here we report a TiHfNbTa bulk medium-entropy alloy(MEA)superconductor crystallized in the body-centered cubic structure with the unit cell parameter a=3.35925?,which is synthesized by an arc melting *** properties of the TiHfNbTa are studied by employing magnetic susceptibility,resistivity,and specific heat *** results show a bulk superconducting transition temperature(Tc)of around 6.75 *** lower and upper critical fields for TiHfNbTa are45.8 m T and 10.46 T,***-principles calculations show that the d electrons of Ti,Hf,Nb,and Ta are the main contribution to the total density of states near the Fermi *** results indicate that the superconductivity is a conventional swave type with extremely strong coupling(△C_(el)/γ_(n)T_(c)=2.88,2△_(0)/k_(B)T_(c)=5.02,and λ_(ep)=2.77).The extremely strong coupling behavior in the s-wave type Ti Hf Nb Ta MEA superconductor is unusual because it generally happens in cuprates,pnictides,and other unconventional superconductors.

关键词： medium-entropy alloy superconductivity s-wave type TiHfNbTa

来源：评论

学校读者我要写书评

暂无评论

Influence of surface modification technique on the properties of jute – Sisal fibre filled epoxy composites

引用

Materials Today: Proceedings 2022年 65卷 2578-2580页

作者： Nigrawal, Archana Kumar Sharma, Arun Haque, Fozia Z. Optical Nano Materials Lab Department of Physics Maulana Azad National Institute of Technology India Department of Mechanical Engineering Laxmipati Institute of Science and Technology India

Natural fibers have gain a lot of consciousness as potential alternative for the substitution of man-made fibers, as reinforcement of a range of resins for highly developed application as they are having little density, renewable, sustainable, and eco-friendly. Throughout processing, natural fibers are not having any harmful effects and are not coarse to the dispensation apparatus. In this paper hybrid composite by using jute fibre and sisal fibre reinforced with epoxy resin has been prepared and their mechanical properties and dc conductivity have been measured. Measurements have been conducted on the hybrid composites by using Electrometer. It is observed that the hybrid composite having unidirectional orientation of jute fibre and sisal fibre gives better mechanical properties. It was observed that the surface treatment of fibres eliminates some quantity of lignin, wax and oils on both sides of the cell wall of the fibres and the alteration of certain amount of alpha to beta cellulose. Due to these changes there is an improvement in tensile strength of the composites and increase in conductivity was also observed. © 2022

关键词： Jute fibers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：