检索结果-内蒙古大学图书馆

Topological surface states in γ-PtBi2 evidenced by scanning tunneling microscopy

science Bulletin 2025年

作者： Guo, Yunkai Yan, Jingming Dong, Wen-Han Li, Yongkai Peng, Yucong Di, Xuetao Li, Caizhen Wang, Zhiwei Xu, Yong Tang, Peizhe Yao, Yugui Duan, Wenhui Xue, Qi-Kun Li, Wei State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China International Center for Quantum Materials Beijing Institute of Technology Zhuhai519000 China School of Materials Science and Engineering Beihang University Beijing100191 China Beijing Academy of Quantum Information Sciences Beijing100193 China Southern University of Science and Technology Shenzhen518055 China Hefei National Laboratory Hefei230088 China

来源：评论

学校读者我要写书评

暂无评论

Effect of pre-deformation on microstructure and mechanical properties of WE43 magnesium alloy II: Aging at 250 and 300℃

引用

Journal of Magnesium and Alloys 2020年第1期8卷 103-110页

作者： Y.H.Kang Z.H.Huang S.C.Wang H.Yan R.S.Chen J.C.Huang Guangdong-Hong Kong Joint Research and Development Center on Advanced Manufacturing Technology for Light Alloys Guangdong Institute of Materials and ProcessingGuangzhou 510650China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016China Hong Kong Institute for Advanced Study Department of Materials Science and EngineeringCity University of Hong KongHong KongChina

In this work,the microstructural evolution and mechanical properties of a pre-deformed WE43 magnesium alloy when aged at 250 and 300℃ were further *** is found that the abundant deformation twins introduced by pre-deformation were maintained within the alloy during the aging *** particles formed at the twin boundaries and coarsened with aging time,especially at 300℃.When peak-aged at 250℃,the fine metastable β'''and β' precipitates formed in the un-deformed alloy have been transformed into relatively large β1 and β precipitates by the *** peak-aged at 300℃,the pre-deformation obviously refined the β *** properties indicate that pre-deformation can increase the yield strength by 19MPa and 54MPa for the peak-aged alloy at 250℃ and 300℃,respectively,and will not obviously deteriorate the tensile elongations.

关键词： WE43 magnesium alloy Pre-deformation Aging Microstructure Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Ab initio study on changing behaviors of lithium-rich layered composite cathode materials

引用

Electrochimica Acta 2024年 500卷

作者： Chuang, Yu-cheng Tran, Ngoc Thanh Thuy Tsai, Ping-chun Lin, Shih-kang Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Research Center National Cheng Kung University Tainan70101 Taiwan Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Core Facility Center National Cheng Kung University Tainan70101 Taiwan

The lithium-rich composite-layered oxide, xLi2MnO3•(1-x)LiM'O2, where M’ represents transition metals, is a promising cathode material with excellent capacity at high working voltage for lithium-ion batteries (LIBs). Nevertheless, an unusual charge-discharge feature is observed for this material with sloping and plateau regions during the initial charging. In this work, ab initio calculations based on density functional theory were employed to examine the stability of xLi2MnO3•(1-x)Li(Ni1/3Co1/3Mn1/3)O2 composite-layered cathode materials during the first charging. Optimized atomistic models for different compositions (x = 0.0, 0.3, 0.4, 0.5, 0.7, and 1) unveil a pseudo-rhombohedral or monoclinic-like structure within the solid solution phase, with simulated X-ray diffraction patterns closely matching experimental data. Using these atomistic models, the first charging process of the 0.4Li2MnO3•0.6Li(Ni1/3Co1/3Mn1/3)O2 cathode were investigated. There exists phase transition from a layered to a spinel structure. Additionally, Bader charge analysis reveals intriguing trends during the first delithiation process, where the valence states of Ni and Co gradual increase, while that of Mn almost remains unchanged. Simultaneously, significant oxidation of O is observed. This finding leads to further evaluations on oxygen vacancy formation in comparison to the energy required for delithiation. Defect formation energy calculations demonstrate that the plateau in charging curve is resulted from oxygen vacancy formation during the first charging. By empirical fitting oxygen chemical potential at μO = -1.200 eV, the calculated charging-discharging curves aligned well with experimental data during the first and second charging. Furthermore, the pathways of lithium and oxygen deintercalation are elucidated. This work contributes fundamental understandings on the xLi2MnO3•(1-x)LiM'O2 composite-layered oxides as cathode for LIBs, providing valuable guidance for further developments

关键词： Cathodes

来源：评论

学校读者我要写书评

暂无评论

Thermoresponsive mobility of liquid crystals and reactive mesogens during photopolymerization-induced phase separation

引用

Physical Review E 2022年第4期106卷 044704-044704页

作者： Hiroshi Kakiuchida Akihiko Matsuyama Eiichi Kobayashi Akifumi Ogiwara Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology Nagoya 463-8560 Japan Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820-8502 Japan Kyushu Synchrotron Light Research Center Tosu 841-0005 Japan Department of Electronic Engineering Kobe City College of Technology Kobe 651-2194 Japan

Molecular interactions between liquid crystals (LCs) and reactive mesogens (RMs) at temperatures across the phase transition regions were comprehensively studied during photopolymerization-induced phase separation (PPIPS) beginning with raw mixtures until the formation of polymer network liquid crystals (PNLCs). Then, the molecules were found to be nonuniformly more and less mobile in response to temperature as PPIPS progressed. Optical birefringence and infrared absorption were carefully measured throughout PPIPS, using 4-cyano-4′-hexylbiphenyl (6CB) and 1,4bis-[4-(3-acryloyloxypropyloxy) benzoyloxy]-2-methylbenzene (RM257) as typical LCs and RMs. Microscopic views of thermoresponsive changes in the molecular orientation order of both LCs and RMs were obtained: LCs and RMs in raw mixtures interacted with one another but uniformly transformed their molecular orientation. Such interactions continuously change to become nonuniform with progress in PPIPS. At the incipient stages of PPIPS, RMs, which are polymerized but not completely networked, inhibit LCs from changing their molecular orientation and vice versa. As PPIPS progresses, some LCs become more mobile and some less mobile owing to RM constraints. The domain configuration of the submicrometer phase separation affects the thermoresponsive mobility of LCs and RMs, that is, LCs become more mobile in LC-richer areas. The quantitative knowledge here provides comprehensive insight that LCs and RMs are mutually constrained and that such interactive behavior varies nonuniformly as PPIPS progresses.

关键词： Birefringence Liquid crystal phase transitions Nematic phase transition Order parameters Phase separation Polymerization Stimuli-responsive materials Liquid crystalline polymers Liquid crystals Nematic liquid crystals Thermotropic liquid crystals Fourier transform infrared spectroscopy Optical spectroscopy Polarized optical microscopy Scanning electron microscopy

来源：评论

学校读者我要写书评

暂无评论

Low-lying electronic states with giant linear dichroic ratio observed in PdSe2

引用

Physical Review B 2022年第12期106卷 L121110-L121110页

作者： Chenyi Gu Xiaowei Liu Cheng Chen Aiji Liang Wei Guo Xinrui Yang Jian Zhou Chris Jozwiak Aaron Bostwick Zhongkai Liu Shi-Jun Liang Yulin Chen Feng Miao Eli Rotenberg Yuefeng Nie National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Institute of Brain-Inspired Intelligence National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China ShanghaiTech Laboratory for Topological Physics Shanghai 201210 China Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of Oxford Oxford OX1 3PU United Kingdom

Palladium diselenide (PdSe2), a recently exploited transition metal dichalcogenide material with a thickness-dependent band gap, anisotropic optical response, and high air stability, has shown excellent performance in electronics and polarization photodetection. However, the origin of the intriguing optical response in this material from a perspective of electronic band structure, including the orbital character and the experimental demonstration of its indirect band gap, has not yet been explored. By applying polarization-dependent, angle-resolved photoemission spectroscopy and density functional theory calculations, we measured an indirect band gap of bulk PdSe2 to be ∼0.36eV. Moreover, the orbital-resolved electronic band structure reveals a top valence band dominated by Pd-d3z2−r2 and Se-pz orbitals, which gives rise to an unprecedented giant linear dichroic ratio of 10, showing a huge orbital-induced anisotropy. Our results elucidate the semiconducting nature of PdSe2 and propose PdSe2 to be an intrinsically orbital-engineered material with giant anisotropy for polarization-related optical applications.

关键词： Band gap Density functional theory Electronic structure Layered semiconductors Polarization Angle-resolved photoemission spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Visualized Degradation of CO_(2)-Based Unsaturated Polyesters toward Structure-Controlled and High-Value-Added Fluorophores

引用

CCS Chemistry 2022年第1期4卷 237-249页

作者： Bo Song Tianwen Bai Dongming Liu Rong Hu Dan Lu Anjun Qin Jun Ling Ben Zhong Tang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSCUT-HKUST Joint Research InstituteAIE InstituteCenter for Aggregation-Induced EmissionSouth China University of Technology(SCUT)Guangzhou 510640 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027 Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science&Technology(HKUST)Clear Water BayKowloonHong Kong 999077

In comparing with traditional polymer degradation toward unknown or unvalued products(i.e.,downcycling),new methods to degrade polymers into monomers or high-value-added materials(i.e.,upcycling)are preferable for sustainable *** this work,CO_(2)-based linear and cross-linked unsaturated polyesters,that is,poly(alkynoate)s,were successfully degraded by benzamidine into diols and high-value-added pyrimidone or imidazolone derivatives through controlled reaction *** degradation process could be visualized under UV light via gradually increased luminescent intensity of the reaction mixtures and fluorescence patterns could be generated through microcontact printing of the stamp on the thin films of poly(alkynoate)***,the pyrimidone derivatives could be applied in bioimaging and inhibiting bacteria,and the imidazolone derivatives could be used for the detection and recovery of gold(III)ions from electronic waste and serve as the fluorescent sensor to detect in situ-generated amines from food ***,this work presents a visualized and high value productselective degradation to solve the end-of-life issue of polymers.

关键词： visualized degradation N-heterocyclic compounds aggregation-induced emission microcontact printing gold enrichment

来源：评论

学校读者我要写书评

暂无评论

3D porous V2O5 architectures for high-rate lithium storage

引用

Journal of Energy Chemistry 2020年第1期29卷 15-21,I0002页

作者： Qifei Li Dong Chen Huiteng Tana Xianghua Zhang Xianhong Rui Yan Yu Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006GuangdongChina Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and EngineeringKey Laboratory of Materials for Energy ConversionChinese Academy of Sciences(CAS)University of Science and Technology of ChinaHefei 230026AnhuiChina State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000SichuanChina Dalian National Laboratory for Clean Energy(DNL) Chinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Guangdong University of Technology Guangzhou 510006GuangdongChina University of Science and Technology of China Hefei 230026Anhui.China

The discovery of novel electrode materials promises to unleash a number of technological advances in lithium-ion batteries.V2O5 is recognized as a high-performance cathode that capitalizes on the rich redox chemistry of vanadium to store *** unlock the full potential of V2O5,nanotechnology solution and rational electrode design are used to imbue V2O5 with high energy and power density by addressing some of their intrinsic disadvantages in macroscopic crystal ***,we demonstrate a facile and environmental-friendly method to prepare nanorods-constructed 3D porous V2O5 architectures(3 D-V2O5)in *** 3D porous architecture is found to be responsible for the enhanced charge transfer kinetics and Li-ion diffusion rate of the 3D-V2O5 *** the result,the 3D-V2O5 surpasses the conventional bulk V2O5 by showing enhanced discharge capacity and rate capability(delivering 154 and 127 m Ah g^-1 at 15 and 20 C,respectively).

关键词： Lithium storage V2O5 cathode Porous structure Mass production High rate

来源：评论

学校读者我要写书评

暂无评论

Effect of pyrolysis temperature on characteristics of tunable magnetic biochar synthesized from watermelon rind and its tetracycline adsorption performance

引用

Journal of the Taiwan Institute of Chemical Engineers 2024年 160卷

作者： Thairattananon, Phisit Le, Giang T.T. Matsumura, Yukihiko Wu, Kevin C.W. Charinpanitkul, Tawatchai Department of Chemical Engineering Faculty of Engineering Center of Excellence in Particle and Material Processing Technology Chulalongkorn University Bangkok10330 Thailand Institute of Fundamental and Applied Sciences Duy Tan University Ho Chi Minh700000 Viet Nam Faculty of Environmental and Chemical Engineering Duy Tan University Da Nang550000 Viet Nam Mechanical Engineering Program Graduate School of Advanced Science and Engineering Kagamiyama Hiroshima Higashi-Hiroshima739-8527 Japan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan Taiwan Research Network of NANOTEC-KU on Nanocatalyst and Nanomaterials for Sustainable Energy and Environment Bangkok10900 Thailand

Background: Tetracycline is an emerging contaminant in water reservoirs, causing undesirable influences on human society. The promising usage of magnetic biochar (MBC) derived from watermelon rind has been explored in the adsorption of various contaminants owing to its high specific surface area and separability;however, the temperature-dependent changes of MBC and its sorption ability toward antibiotics have not been widely examined. Method: Tunable MBCs could be synthesized via simple pyrolysis of watermelon rind impregnated with FeCl3 at different temperatures (700–900 °C). The as-synthesized MBCs were characterized using scanning electron microscopy (SEM), an elemental analyzer, N2 adsorption/desorption, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffractometry (XRD), and vibrating sample magnetometry (VSM). Then Tetracycline, an emerging contaminant in water reservoirs, was employed as the target contaminant, while adsorption kinetics, isotherm, the effect of pH, and reusability were investigated. Significant findings: The tunability of as-synthesized MBCs could be observed by their distinct changes in structural characteristics when varying pyrolysis temperature. MBC synthesized at 900 °C (MBC900) possessed a high-specific surface area (401 m2.g−1) and saturation magnetization (55.29 emu.g−1), resulting in a greater amount of sorption sites. Tetracycline adsorption by MBCs followed a pseudo-second-order kinetic model and fitted well with the Freundlich model. MBC900 is an excellent adsorbent with a maximum adsorption capacity of 77.6 mg.g−1 and could be used for at least five cycles with an insignificant decrease in the adsorption capacity. © 2024 Taiwan Institute of Chemical Engineers

关键词： Adsorption

来源：评论

学校读者我要写书评

暂无评论

Multi-modal Long-Short Distance Attention-based Transformer-GAN for PET Reconstruction with Auxiliary MRI

引用

IEEE Transactions on Circuits and Systems for Video technology 2025年

作者： Zeng, Pinxian Zeng, Xinyi Wang, Yan Zhou, Luping Zu, Chen Wu, Xi Zhou, Jiliu Shen, Dinggang Sichuan University School of Computer Science China University of Sydney School of Electrical and Information Engineering Australia Department of Risk Controlling Research *** China Chengdu University of Information Technology School of Computer Science China ShanghaiTech University School of Biomedical Engineering State Key Laboratory of Advanced Medical Materials and Devices Shanghai201210 China Shanghai United Imaging Intelligence Co. Ltd Shanghai200232 China Shanghai Clinical Research and Trial Center Shanghai201210 China

To obtain high-quality PET scans while minimizing potential radiation hazards for patients, various GAN-based methods have been developed to reconstruct high-quality standard-count PET (SPET) images from low-count PET (LPET) ones. While recent efforts try to integrate MRI or CT to enhance reconstruction in a multi-modal way, current architectures mainly face two limitations: (1) CNN backbones or simple Transformer bottleneck layers are insufficient for robust semantic understanding, and (2) the identical strategies for multi-modal feature extraction and fusion overlook each modality's respective importance for the reconstruction task. In this work, we propose the Multi-modal Long-Short Distance Attention-based Transformer-GAN (MLSDA-GAN), a novel network combining 3D transformer and CNN architecture for PET image reconstruction. Specifically, to extract fine-grained features with a small number of parameters, our MLSDA-GAN integrates multi-scale convolution into the embedding part of the transformer. As for our multi-modal design, given the strong correlation between LPET and SPET in structural characteristics, we treat MRI as an auxiliary modality to LPET and achieve effective multi-modal extraction and fusion strategies. These strategies include (1) a PET-specific Self-attention Extraction (PSE) block for comprehensive feature extraction of the primary LPET and (2) a Multi-modality Cross-attention Fusion (MCF) block for effective multi-modal interaction and fusion, enabling us to more efficiently model both long- and short-range relationships in the corresponding feature extraction and fusion processes. Experiments demonstrate superiority of our method quantitatively and qualitatively. Code is available at https://***/Aru321/MLSDA-GAN. © 1991-2012 IEEE.

关键词： Radiation hazards

来源：评论

学校读者我要写书评

暂无评论

Thermoelectric Transportation in Cu-Added Ca3co4o9 Ceramics Consolidated by Spark Plasma Sintering

SSRN

引用

SSRN 2022年

作者： Iqbal, Muhammad Umer Sumayya Butt, Sajid Farooq, Muhammad Umer Hussain, Shahid Irfan, Syed Ali, Nazakat Basit, Muhammad Abdul Akram, Muhammad Aftab Yasir, Muhammad Department of Materials Science and Engineering Institute of Space Technology Islamabad44000 Pakistan Department of Space Science Institute of Space Technology Islamabad44000 Pakistan Department of Physics University of Education Lahore Pakistan School of Materials Science and Engineering Jiangsu University Zhenjiang212013 China Shenzhen Key Laboratory of Advanced Thin Films and Applications College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Institute of Space Technology Islamabad44000 Pakistan Pak-Austria Fachhochschule: Institute of Applied Sciences Department of Materials Science and Engineering Mang Khanpur Road KPK Haripur Pakistan

During the last decade, misfit layered calcium cobaltite (Ca3Co4O9) has appeared as a potential candidate for oxide thermoelectric materials. In the present work, we report improved thermoelectric properties of Ca3Co4O9 through a facile synthesis route. Ca3Co4O9 based composites have been prepared by mixing different wt. % of Cu using ball-milling. The pure and composite powdered samples have been consolidated into bulk ceramics by spark plasma sintering (SPS). The detailed structural investigations reveal multiphase system comprising of Cu, Ca3Co4O9, Ca3Co4-xCuxO9 and along with a minority phase of Co3O4.. The simultaneous improvement in the electrical conductivity and Seebeck coefficient results in an improved power factor and the highest value of 384μW/m.K2 at 973K have been obtained for sample containing 5% Cu by wt. The conduction mechanisms have been discussed in details in order to investigate the reasons associated with the improved thermoelectric properties. © 2022, The Authors. All rights reserved.

关键词： Seebeck coefficient

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：