检索结果-内蒙古大学图书馆

Distinct MLT asymmetry of auroral kilometric radiation observed by the FAST satellite

Earth and Planetary physics 2025年第1期9卷 188-193页

作者： JiaWen Tang Sai Zhang FuLiang Xiao HongMing Yang Si Liu YiHua He Chang Yang YuYue Jin ZhouKun Deng Ping Li Archie James Johnston School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410114China Hunan Province Higher Education Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments Changsha University of Science and TechnologyChangsha 410114China School of Electrical and Information Engineering Changsha University of Science and TechnologyChangsha 410114China

Auroral Kilometric Radiation (AKR) is a common radio emission,which can contribute to the magnetosphere-ionosphereatmosphere co u *** emissions have been observed in all magnetic planet magnetospheres of the solar *** this study,using observations from the FAST satellite from 30 August 1996 to 9 September 2001,the distribution of AKR in altitude=500-4500 km and invariant latitude (|ILAT|)=60°-80°has been analyzed.63045 AKR samples have been identified with~48%(52%) samples on the dayside (nightside).Of considerable interest,there is a distinct MLT asymmetry with the high occurrence rate in MLT=05-08 and 18-22(02-05 and 12-17) in the northern (southern) *** distinct MLT asymmetry is associated with the direction of Bxof the interplaneta ry magnetic *** addition,the occurrence rate on the nightside clearly increases as the AE^(*) index *** study further enriches the information and understanding of AKR in the magnetosphere as well as other similar radio emissions.

关键词： asymmetry auroral kilometric radiation interplanetary magnetic field

来源：评论

学校读者我要写书评

暂无评论

A Scalable and Effective Strategy for Boosting the Initial Coulombic Efficiency of Silicon Suboxide Anode

引用

Energy Material Advances 2024年第1期5卷 374-383页

作者： Zhao Yang Yaozong Yang Zhaolin Li Jie Wang Ying Luo Jingying Xie Hailei Zhao School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Municipal Key Lab for Advanced Energy Materials and Technologies Beijing 100083China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghai 200245China

Silicon suboxide(SiO_(x))is one of the most attractive candidates for anode materials for high-energy-density lithium-ion batteries due to its high specific capacity and its relatively lower volume expansion than that of ***,its low initial Coulombic efficiency(ICE)seriously affects its practical *** this work,we demonstrate a scalable and effective strategy to enable a high ICE of the SiO_(x) electrode through a MnO-assisted disproportionation *** obtained Mn_(2)SiO_(4)-Si-SiO_(x)@C(MSS@C)material shows a reduced lithium irreversible consumption in the first *** Mn_(2)SiO_(4) phase can store lithium through a conversion reaction with a smaller volume change(33%)than SiO_(x),which helps to maintain the structural stability of MSS@C during ***,the metallic Mn nanoparticles generated from Mn_(2)SiO_(4) during the lithiation process facilitate electron conduction,thus improving the electrode reaction *** to the synergetic effects,the MSS@C material exhibits a higher ICE(79.51%)compared to 60.91%of pure SiO_(x),and a superior cyclic performance(832 mAh g^(−1) at 0.5 A g^(−1) after 350 cycles with a capacity retention of 90.4%).This work offers a new approach to increase the ICE while improving the electrode reaction kinetics and cycling stability of SiO_(x)-based materials.

关键词： coulombic efficiency ice seriously effective strategy lithium ion batteries silicon suboxide sio x anode materials anode material initial coulombic efficiency scalable strategy

来源：评论

学校读者我要写书评

暂无评论

Unlocking Co3O4–ZnO p-n heterojunction for superior acetone gas sensing detection

引用

Progress in Natural science:Materials International 2024年第5期34卷 990-999页

作者： Xingxing Liu Tingting Shao Juntang Dong Huirong Kou Fuchun Zhang Yuyang Cheng Jiaming Guo Shuwei Tian Kuldeep K.Saxena Xinghui Liu School of Physics and Electronic Information Yan'an University Division of Research and Development Lovely Professional University Science and Technology on Aerospace Chemical Power Laboratory Laboratory of Emergency Safety and Rescue Technology Hubei Institute of Aerospace Chemotechnology Department of Materials Physics Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences (SIMTS)

In this study, we synthesized pure ZnO and Co3O4–ZnO precursors with varied Co, Zn ratios via solvothermal method, and then the precursors were calcined at 400°C for 2 h in a muffle furnace under air to obtain composites for acetone detection. The structure, morphology, elemental composition, microstructure and chemical state of these materials were systematically studied by various characterization techniques. Additionally, we also evaluated the gas sensing performance of the composites-based sensors, focusing on optimal operating temperature,baseline resistance, repeatability, stability, selectivity, response/recovery time, and resistance under varying relative humidity. The findings reveal that 3 % Co3O4–ZnO-based sensor exhibit the highest response value to 100 ppm acetone（74）, showing an enhancement of approximately 9.3 times compared to the pure ZnO-based sensor（8）. Furthermore, the 3 % Co3O4–ZnO-based sensor demonstrate the advantages of rapid response/recovery times（15 s/2 s）, outstanding selectivity, and remarkable stability. The gas sensing mechanism of the composite material is also discussed in detail, which provides insights into the observed enhancement of gas sensing performance. It provides an idea for the follow-up study on gas sensing performance of acetone sensors.

关键词： Heterojunction Acetone Co_3O_4-ZnO Gas sensing Solvothermal method

来源：评论

学校读者我要写书评

暂无评论

The global lithospheric field modeling based on MSS-1 and other satellites' gradient data

引用

Earth and Planetary physics 2025年第3期9卷 677-685页

作者： YuXuan Lin Yan Feng JiaXuan Zhang XinWu Li Ya Huang Institute of Space Weather School of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China State Key Laboratory of Environment Characteristics and Effects for Near-space Nanjing University of Information Science&TechnologyNanjing 210044China Macao Institute of Space Technology and Application Macao University of Science and TechnologyMacao 999078China

We combine gradient data from the Macao science Satellite-1(MSS-1),CHAllenging Minisatellite Payload(CHAMP),Swarm-A,and Swarm-C satellites to develop a 110-degree lithospheric magnetic field *** then comprehensively evaluate the performance of the model by power spectral comparisons,correlation analyses,sensitivity matrix assessments,and comparisons with existing lithospheric field *** showed that using near east–west gradient data from MSS-1 significantly enhances the model correlation in the spherical harmonic degree(N) range of 45–60 while also mitigating the decline in correlation at higher degrees(N > 60).Furthermore,the unique orbital characteristics of MSS-1 enable its gradient data to provide substantial contributions to modeling in the mid-to low-latitude *** continued data acquisition from MSS-1 and further optimization of data processing methods,the performance of the model is expected to improve.

关键词： lithospheric magnetic field Macao science Satellite-1 gradient data LCS-1

来源：评论

学校读者我要写书评

暂无评论

Producing high performance TiB2 ceramics by high-pressure sintering forging

引用

Ceramics International 2025年第15期51卷 20116-20123页

作者： Liu, Bing Chen, Shilong Ma, Mengdong Pan, Yilong Zhao, Song Zhou, Hang Sun, Lei Chen, Shuai Guo, Xiaogang Tong, Ke Zou, Yitong Huo, Langlang Dong, Xiao Zhao, Zhisheng Key Laboratory of Weak-Light Nonlinear Photonics and School of Physics Nankai University Tianjin300071 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China State Key Laboratory of Crane Technology Yanshan University Qinhuangdao066004 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

The densification of ultra-high temperature ceramics (UHTCs) has been a historical challenge due to their inherent refractory nature. In this study, we propose a novel approach, high-pressure sintering forging (HPSF), for the preparation of a typical UHTC: TiB2. Unlike traditional sintering methods, HPSF technology can achieve full densification at a relatively low temperature of 1650 °C. The TiB2 ceramics fabricated via HPSF exhibit exceptional mechanical properties, including a nanoindentation hardness of 30.8 GPa and a flexural strength of 586 MPa, both notably higher than those prepared by conventional sintering methods. Microstructural analysis demonstrates that these enhancements are primarily attributed to grain boundary strengthening and grain refinement caused by the fragmentation and plastic deformation of particles through high pressure forging. This study demonstrates the potential of HPSF as an effective technique for the densification of TiB2 ceramics. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Brinell Hardness

来源：评论

学校读者我要写书评

暂无评论

Einstein-de Haas effect:a bridge linking mechanics,magnetism,and topology

引用

science Bulletin 2025年第3期70卷 301-304页

作者： Xin Nie Dao-Xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and TechnologiesCenter for Neutron Science and TechnologySchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China

The Einstein-de Haas(EdH)effect,which establishes that changes in magnetization induce mechanical rotation,was experimentally demonstrated in 1915[1],independently of Richardson’s[2]earlier conceptual prediction rela... 详细信息

关键词： effect linking topology

来源：评论

学校读者我要写书评

暂无评论

Spatial and temporal evolution of electromagnetic pulses from solid target irradiated with multi-hundred-terawatt laser pulse inside target chamber

引用

Plasma science and technology 2024年第2期26卷 62-69页

作者：何强友邓志刚张智猛夏亚东张博孟令彪贺书凯黄华杨雷刘红杰范伟林晨周维民李廷帅颜学庆 State Key Laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of EducationCAPTPeking UniversityBeijing 100871People's Republic of China Science and Technology on Plasma Physics Laboratory Research Center of Laser FusionChina Academy of Engineering PhysicsMianyang 621900People's Republic of China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731People's Republic of China Beijing Laser Acceleration Innovation Center Beijing 101400People's Republic of China

Giant electromagnetic pulses(EMPs) induced by high-power laser irradiating solid targets interfere with various experimental diagnoses and even damage equipment,so unveiling the evolution of EMPs inside the laser chamber is crucial for designing effective EMP *** this work,the transmission characteristics of EMPs as a function of distances from the target chamber center(TCC) are studied using B-dot *** mean EMP amplitude generated by picosecond laser-target interaction reaches 561 kV m^(-1),357 kV m^(-1),395 kV m^(-1),and 341 kV m^(-1)at 0.32 m,0.53 m,0.76 m,and 1 m from TCC,which decreases dramatically from 0.32 m to 0.53 ***,it shows a fluctuation from 0.53 m to 1 *** temporal features of EMPs indicate that time-domain EMP signals near the target chamber wall have a wider full width at half maximum compared to that close to TCC,mainly due to the echo oscillation of electromagnetic waves inside the target chamber based on simulation and *** conclusions of this study will provide a new approach to mitigate strong electromagnetic pulses by decreasing the echo oscillation of electromagnetic waves inside the target chamber during laser coupling with targets.

关键词： target electromagnetic pulses spatial distribution

来源：评论

学校读者我要写书评

暂无评论

Superconductivity in Cubic La_(3)Al with Interstitial Anionic Electrons

引用

Chinese physics Letters 2025年第2期42卷 88-97页

作者： Zhijun Tu Peihan Sun Donghan Jia Huiyang Gou Kai Liu Hechang Lei School of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceHebei University of Science and TechnologyShijiazhuang 050018China Center for High Pressure Science and Technology Advanced Research Beijing 100193China

We observed superconductivity in a cubic La_(3)Al single crystal that exhibits metallic behavior in the normal state without an observable structural transition and enters the superconducting state below T_(c)~6.32 *** characterization and analysis indicate that cubic La_(3)Al is a bulk type-Ⅱ BCS ***,theoretical calculations show that it can host interstitial anionic electrons located at the body center of the cubic unit cell,which confirms electron-phonon coupling as the superconducting ***,cubic La_(3)Al can be considered as a novel electride superconductor.

关键词： mechanism cubic

来源：评论

学校读者我要写书评

暂无评论

Improved Plasticity of Fe_(25)Co_(25)Ni_(25)(Si_(0.3)B_(0.7))_(25) High Entropy Bulk Metallic Glass through the Addition of Cu

引用

Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 417-425页

作者： Xueru Fan Lei Xie Qiang Li Chuntao Chang Hongxiang Li School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work was focused on enhancement in the plasticity of Fe_(25)Co_(25)Ni_(25)(Si_(0.3)B_(0.7))_(25) high entropy bulk metallic glass(HE-BMG)by adding minor Cu(0–1.2,in at.%).It is found that the appropriate addition of Cu can efficiently improve the plasticity of the present HE-BMG while the excessive addition of Cu will deteriorate again the plasticity,and especially,the plastic strain of the present HE-BMG is improved from 0.8%for the Cu-free alloy to 4.7%for the 0.3 at.%Cu-added *** transmission electron microscopy observation shows that there are manyα-Fe(Co,Ni)clusters with sizes of less than 5 nm dispersed in the glassy matrix in the 0.3 and 0.6 at.%Cu-added alloys,which may account for the significant improvement in the plasticity of the two alloys,and further increase in Cu content more than 0.9 at.%leads to the precipitation ofα-Fe(Co,Ni)and Fe(Co,Ni)B compound grains with diameters of tens of nanometers,in which the plasticity of the present HE-BMGs has deteriorated rapidly.

关键词： High entropy alloys Bulk metallic glasses Glass forming ability Nano-crystallization Plasticity Microstructure

来源：评论

学校读者我要写书评

暂无评论

Effect of attack angle on the electromagnetic wave transmission characteristics in the hypersonic plasma sheath of a re-entry vehicle

引用

Plasma science and technology 2024年第12期26卷 49-62页

作者： Xin AI Qiuyue NIE Zhonglin ZHANG Peiqi CHEN Shulei ZHENG Changshi YAN Guoqiang WEI School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001People’s Republic of China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Physics Harbin Institute of TechnologyHarbin 150001People’s Republic of China

The attack angle may greatly affect the hypersonic plasma sheaths around the re-entry vehicle,thereby affecting the transmission characteristics of electromagnetic(EM)waves in the *** this paper,we propose an integrated three-dimensional(3D)model with various attack angles and realistic flying conditions of radio attenuation measurement C-II(RAM C-II)re-entry tasks for analyzing the effect of the attack angle on the transmission characteristics of EM waves in the *** is shown that the electron density and collision frequency of the sheath on the windward side can be increased by an order of magnitude with the increase of the attack ***,the thickness of the sheath on the leeward side is increased where the electron density and collision frequency are *** EM waves are mainly reflected on the windward plasma sheath due to the cutoff effect,and the radio-frequency(RF)blackout is mitigated if the antenna is positioned on the leeward ***,by planning the trajectory properly and installing the antenna accordingly during the re-entry,it is possible to provide an approach for mitigation of the RF blackout problem to an extent.

关键词： attack angle hypersonic plasma sheath re-entry vehicle transmission characteristics

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：