检索结果-内蒙古大学图书馆

On-demand reverse design of polymers with PolyTAO

npj Computational Materials 2024年第1期10卷 317-327页

作者： Haoke Qiu Zhao-Yan Sun State Key Laboratory of Polymer Physics and Chemistry&Key Laboratory of Polymer Science and Technology Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022 JilinChina School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026 AnhuiChina

The forward screening and reverse design of drug molecules,inorganic molecules,and polymers with enhanced properties are vital for accelerating the transition from laboratory research to market ***,due to the scarcity of large-scale datasets,the discovery of polymers via materials informatics is particularly ***,scientists have developed various machine learning models for polymer structure-property relationships using only small polymer datasets,thereby advancing the forward screening process of ***,the success of this approach ultimately depends on the diversity of the candidate pool,and exhaustively enumerating all possible polymer structures through human imagination is ***,achieving on-demand reverse design of polymers is *** this work,we curate an immense polymer dataset containing nearly one million polymeric structure-property pairs based on expert knowledge.

关键词： property thereby inorganic

来源：评论

学校读者我要写书评

暂无评论

Contribution of the Chinese Meridian Project to space environment research:Highlights and perspectives

引用

science China Earth sciences 2023年第7期66卷 1423-1438页

作者： Chi WANG Jiyao XU Libo LIU Xianghui XUE Qinghe ZHANG Yongqiang HAO Gang CHEN Hui LI Guozhu LI Bingxian LUO Yajun ZHU Jiangyan WANG State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth and Space Sciences University Science and Technology of ChinaHefei 230026China Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China School of Earth and Space Sciences Peking UniversityBeijing 100191China Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China Key Laboratory of Science and Technology on Environmental Space Situation Awareness National Space Science CenterChinese Academy of SciencesBeijing 100190China

The Chinese Meridian Project(CMP)is devoted to establishing a comprehensive ground-based monitoring network for China’s space weather *** is a major national science and technology infrastructure project with the participation of more than 10 research institutions and universities led by the National space science Center of the Chinese Academy of *** is planned to be constructed in two phases:CMP phasesⅠandⅡ.The first phase(CMP-Ⅰ)started construction in2008 and completed in 2012,after which it entered the operation *** 10-year observation of CMP-Ⅰhas made significant scientific discoveries and achievements in the research fields of the middle and upper atmospheric fluctuations,metal layers in the mesosphere and lower thermosphere,ionospheric disturbances and irregularities,geomagnetic disturbances,and influences of solar *** review summarizes the main observations and research achievements,space weather forecast modeling and methods based on CMP-Ⅰover the past 10 years,and presents a future extension perspective along with the construction of CMP-Ⅱ.

关键词： Chinese Meridian Project Ground-based observation network space weather Solar-terrestrial physics

来源：评论

学校读者我要写书评

暂无评论

Jet tagging with more-interaction particle transformer

引用

Chinese physics C 2025年第1期49卷 164-176页

作者： Yifan Wu Kun Wang Congqiao Li Huilin Qu Jingya Zhu College of Science University of Shanghai for Science and TechnologyShanghai 200093China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China CERN EP DepartmentCH-1211 Geneva 23Switzerland School of Physics and Electronics Henan UniversityKaifeng 475004China

In this paper,we introduce the More-Interaction Particle Transformer(MIParT),a novel deep-learning neural network designed for jet *** framework incorporates our own design,the More-Interaction Attention(MIA)mechanism,which increases the dimensionality of particle interaction *** tested MIParT using the top tagging and quark-gluon *** results show that MIParT not only matches the accuracy and AUC of LorentzNet and a series of Lorentz-equivariant methods,but also significantly outperforms the ParT model in background ***,it improves background rejection by approximately 25% with a signal efficiency of 30% on the top tagging dataset and by 3% on the quark-gluon ***,MIParT requires only 30% of the parameters and 53% of the computational complexity needed by ParT,proving that high performance can be achieved with reduced model *** very large datasets,we double the dimension of particle embeddings,referring to this variant as MIParT-Large(MIParT-L).We found that MIParT-L can further capitalize on the knowledge from large *** a model pre-trained on the 100M JetClass dataset,the background rejection performance of fine-tuned MIParT-L improves by 39% on the top tagging dataset and by 6% on the quark-gluon dataset,surpassing that of fine-tuned ***,the background rejection of fine-tuned MIParT-L improves by an additional 2% compared to that of fine-tuned *** results suggest that MIParT has the potential to increase the efficiency of benchmarks for jet tagging and event identification in particle physics.

关键词： jet tagging collider physics machine learning

来源：评论

学校读者我要写书评

暂无评论

Rare-Earth Chalcogenides:An Inspiring Playground for Exploring Frustrated Magnetism

引用

Chinese physics Letters 2024年第11期41卷 208-220页

作者： Mingtai Xie Weizhen Zhuo Yanzhen Cai Zheng Zhang Qingming Zhang School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The rare-earth chalcogenide ARECh_(2) family(A=alkali metal or monovalent ions,RE=rare earth,Ch=chalcogen)has emerged as a paradigmatic platform for studying frustrated magnetism on a triangular *** family members exhibit a variety of ground states,from quantum spin liquid to exotic ordered phases,providing fascinating insight into quantum *** simple crystal structure and chemical tunability enable systematic exploration of competing interactions in quantum *** neutron scattering and thermodynamic studies have revealed rich phase diagrams and unusual excitations,refining theoretical models of frustrated *** review provides a succinct introduction to ARECh_(2)*** summarizes key findings on crystal structures,single-ion physics,magnetic Hamiltonians,ground states,and low-energy *** highlighting current developments and open questions,we aim to catalyze further exploration and deeper physical understanding on this frontier of quantum magnetism.

关键词： quantum excitation crystal

来源：评论

学校读者我要写书评

暂无评论

Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3（001） via metallic δ-doping

引用

National science Review 2024年第3期11卷 119-127页

作者： Xiaotong Jiao Wenfeng Dong Mingxia Shi Heng Wang Cui Ding Zhongxu Wei Guanming Gong Yanan Li Yuanzhao Li Binjie Zuo Jian Wang Ding Zhang Minghu Pan Lili Wang Qi-Kun Xue State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University School of Physics&Information Technology Shaanxi Normal University Beijing Academy of Quantum Information Sciences Department of Physics Southern University of Science and Technology International Center for Quantum Materials School of Physics Peking University Department of Physics The Pennsylvania State University Collaborative Innovation Center of Quantum Matter Hefei National Laboratory

Superconductivity transition temperature（Tc） marks the inception of a macroscopic quantum phase-coherent paired state in fermionic systems. For 2D superconductivity, the paired electrons condense into a coherent superfluid state at Tc, which is usually lower than the pairing temperature, between which intrinsic physics including Berezinskii–Kosterlitz–Thouless transition and pseudogap state are hotly debated. In the case of monolayer FeSe superconducting films on SrTiO3（001）, although the pairing temperature（Tp） is revealed to be 65–83 K by using spectroscopy characterization, the measured zero-resistance temperature（Tc0） is limited to 20 K. Here, we report significantly enhanced superconductivity in monolayer FeSe films by δ-doping of Eu or Al on SrTiO3（001） surface, in which Tc0is enhanced by 12 K with a narrowed transition width ΔTc～8 K, compared with non-doped samples. Using scanning tunneling microscopy/spectroscopy measurements, we demonstrate lowered work function of the δ-doped SrTiO3（001） surface and enlarged superconducting gaps in the monolayer FeSe with improved morphology/electronic homogeneity. Our work provides a practical route to enhance 2D superconductivity by using interface engineering.

关键词： monolayer FeSe interface superconductivity δ-doping zero-resistance temperature superconductivity transition temperature

来源：评论

学校读者我要写书评

暂无评论

Physical mechanism of secondary-electron emission in Si wafers

引用

Chinese physics B 2024年第4期33卷 677-681页

作者：赵亚楠孟祥兆彭淑婷苗光辉高玉强彭斌崔万照胡忠强 State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research LaboratoryKey Laboratory of the Ministry of EducationEngineering Research Center of Spin Quantum Sensor ChipsUniversities of Shaanxi ProvinceSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China College of Aeronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China National Key Laboratory of Science and Technology on Space Microwave China Academy of Space TechnologyXi'an 710100China Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241000China

CMOS-compatible RF/microwave devices,such as filters and amplifiers,have been widely used in wireless communication ***,secondary-electron emission phenomena often occur in RF/microwave devices based on silicon(Si)wafers,especially in the high-frequency *** this paper,we have studied the major factors that influence the secondary-electron yield(SEY)in commercial Si wafers with different doping *** show that the SEY is suppressed as the doping concentration increases,corresponding to a relatively short effective escape depthλ.Meanwhile,the reduced narrow band gap is beneficial in suppressing the SEY,in which the absence of a shallow energy band below the conduction band will easily capture electrons,as revealed by first-principles ***,the new physical mechanism combined with the effective escape depth and band gap can provide useful guidance for the design of integrated RF/microwave devices based on Si wafers.

关键词： secondary-electron yield doping concentration escape depth Si wafer

来源：评论

学校读者我要写书评

暂无评论

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

引用

Nuclear science and Techniques 2024年第8期35卷 58-68页

作者： Qiang Li Li‑Jiao Wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑Jun Ning Kai Pan Wei Xu Tao Li Su‑Peng Lu Han Yi Rui‑Rui Fan Chang‑Qing Feng Rong Zhang Xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Gong Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu Yi‑Na Liu Guang‑Yuan Luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng Wang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui Zhang Hang‑Chang Zhang Lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

来源：评论

学校读者我要写书评

暂无评论

Experimental test of an extension of the Rosenzweig-Porter model to mixed integrable-chaotic systems experiencing time-reversal invariance violation

引用

中国物理B（英文版） 2024年第12期33卷 228-239页

作者：张晓东车炯宁 Barbara Dietz Lanzhou Center for Theoretical Physics Lanzhou University Key Laboratory of Theoretical Physics of Gansu ProvinceKey Laboratory of Quantum Theory and Applications of the Ministry of Education Lanzhou 730000 Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Korea Daejeon 34126 Yangtze Delta Region Institute University of Electronic Science and Technology of China Huzhou 313001 Basic Science Program Korea University of Science and Technology (UST) Korea Daejeon 34113

We report on the theoretical and experimental investigations of the transition of a typical quantum system with mixed regular-integrable classical dynamics to one with violated time-reversal(T)*** measurements are performed with a flat superconducting microwave resonator with circular shape in which chaoticity is induced by using either long antennas or inserting two circular disks into the cavity,and by magnetizing a ferrite disk placed at its center,which leads to violation of T *** propose an extension of the Rosenzweig-Porter(RP)model,which interpolates between mixed regular-chaotic instead of integrable dynamics and fully chaotic dynamics with violated T-invariance,and derive a Wigner-surmise like analytical expression for the corresponding nearest-neighbor spacing *** propose a procedure involving this result and those for the RP model to determine the size of(Γ)-invariance violation and chaoticity and validate it employing the experimental eigenfrequency spectra.

关键词： wave chaos quantum chaos quantum billiards microwave billiards random matrix theory mi-crowave experiments

来源：评论

学校读者我要写书评

暂无评论

Central role of d-band energy level in Cu-based intermetallic alloys

引用

npj Computational Materials 2024年第1期10卷 2497-2504页

作者： Jing Zhao Wenming Xia Zhi Zeng Xianlong Wang Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefei 230026China

Cu-Au intermetallic alloys are classic paradigms in the history of alloy theory for studying orderdisorder transition,phase stability,and so ***,density functional theory with a generalized gradient approximation(GGA)fails to describe their formation energies and Au-rich ground states,e.g.,calculated formation energies are nearly 40%smaller than experimental *** this work,we found that these discrepancies,which are also common in other Cu-transition metal(TM)intermetallic alloys,are actually caused by the fact that GGA produces Cu-3d bands with a shallower energy level than the experimental results,leading to incorrect d-d *** using the Hubbard U correction to adjust the d-bands to the correct position,the discrepancies in GGA calculations are *** finding that the correct d-bands position is the key to characterize Cu-TMs,which can be achieved efficiently by applying the Hubbard U correction.

关键词： intermetallic alloys alloy

来源：评论

学校读者我要写书评

暂无评论

3D near-surface P-wave velocity structure imaging with Distributed Acoustic Sensing and electric hammer source

引用

Earthquake Research Advances 2024年第3期4卷 27-33页

作者： Heting Hong Fu Yin Yuhang Lei Yulan Li Baoshan Wang Deep Space Exploration Laboratory University of Science and Technology of ChinaHefei230026China School of Earth and Space Sciences University of Science and Technology of ChinaHefei230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei230026China

Distributed Acoustic Sensing(DAS) is an emerging technique for ultra-dense seismic observation, which provides a new method for high-resolution sub-surface seismic imaging. Recently a large number of linear DAS arrays have been used for two-dimensional S-wave near-surface imaging in urban areas. In order to explore the feasibility of three-dimensional(3D) structure imaging using a DAS array, we carried out an active source experiment at the Beijing National Earth Observatory. We deployed a 1 km optical cable in a rectangular shape, and the optical cable was recast into 250 sensors with a channel spacing of 4 m. The DAS array clearly recorded the P, S and surface waves generated by a hammer source. The first-arrival P wave travel times were first picked with a ShortTerm Average/Long-Term Average(STA/LTA) method and further manually checked. The P-wave signals recorded by the DAS are consistent with those recorded by the horizontal components of short-period seismometers. At shorter source-receiver distances, the picked P-wave arrivals from the DAS recording are consistent with vertical component recordings of seismometers, but they clearly lag behind the latter at greater *** is likely due to a combination of the signal-to-noise ratio and the polarization of the incoming wave. Then,we used the Tomo DD software to invert the 3D P-wave velocity structure for the uppermost 50 m with a resolution of 10 m. The inverted P-wave velocity structures agree well with the S-wave velocity structure previously obtained through ambient noise tomography. Our study indicates the feasibility of 3D near-surface imaging with the active source and DAS array. However, the inverted absolute velocity values at large depths may be biased due to potential time shifts between the DAS recording and seismometer at large source-receiver distances.

关键词： Distributed Acoustic Sensing(DAS) Near-surface structure First-arrival travel time tomography Body wave Active source

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：