检索结果-内蒙古大学图书馆

2nd International Workshop on High Performance Computing for Advanced Modeling and Simulation in Nuclear Energy and Environmental science, HPCMS 2018, and 1st International Workshop on HPC Supported Data Analytics for Edge Computing, HiDEC 2018 held at the 32nd ACM International Conference on Supercomputing, ACM ICS 2018

作者： Wang, Xianmeng Hu, Changjun Yang, Wen Liu, Tiancai Wang, Zhaoshun Wang, Xuesong Yang, Hongwei Wu, Mingyu Wang, Jue Wang, An Zhou, Zhifeng School of Computer and Communication Engineering University of Science and Technology Beijing China Beijing Key Laboratory of Knowledge Engineering for Material Science Beijing China China Institute of Atomic Energy Beijing China Computer Network Information Center Chinese Academy of Science Beijing China

ISBN: (纸本)9789813299863

Virtual reactor is an interplanetary research field, which leverages the leading supercomputers to provide a profound understanding of existing reactors and design guidance for future reactors. Virtual reactor is at the cutting-edge of high performance computing and nuclear engineering research fields. The United States, European Union and China have put great effort into virtual reactor research. The research areas of virtual reactors include integrated platform, safety analysis, system analysis, core physics components, database, uncertainty quantification, verification and validation. Typically, core physics consist of thermal-hydraulics, mechanics, neutronics, fuel, and material performance software. Virtual reactor requires enormous computing and storage resource. The computing capabilities of Exascale supercomputers enables realistic models and high-resolution numerical methods come into play. Compared to traditional way, virtual reactor makes simulation more accurate (high-fidelity models are used, such as LES, multi-group transport theory), larger scaled (such as more atoms in molecular dynamics) and tighter coupled. Meanwhile, great challenges have been posed to models, numerical methods, algorithms and programing, especially considering the complicated modern architectures of supercomputers. The paper focuses on the research areas, computing and storage requirements, challenges of virtual reactors. © Springer Nature Singapore Pte Ltd 2019.

关键词： Numerical methods

来源：评论

学校读者我要写书评

暂无评论

In-situ study of the temperature effects on the magneto-structural transition in the MnCoGe-based magnetocaloric compounds

引用

Acta Materialia 2025年 296卷

作者： Xiaowen Hao Ying Zhao Xiaoming Huang Kang Liu Binru Zhao Cuiping Zhang Jie Ma Fengjiao Qian Xuefei Miao Yafei Kuang Haile Yan Zongbin Li Liang Zuo Xin Tong Bo Yang Qingyong Ren Institute of High Energy Physics Chinese Academy of Sciences 100049 Beijing China Spallation Neutron Source Science Center 523803 Dongguan China Guangdong Provincial Key Laboratory of Extreme Conditions Dongguan 523803 China Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) School of Material Science and Engineering Northeastern University Shenyang 110819 China Department of Applied Physics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Key Laboratory of Artificial Structures and Quantum Control School of Physics and Astronomy Shanghai Jiao Tong University Shanghai China School of Materials Science and Engineering Nanjing University of Science and Technology 200 Xiaolingwei Street Nanjing 210094 China School of Materials Science & Engineering Taiyuan University of Science and Technology Taiyuan 030024 China

The first-order magneto-structural transition with large adiabatic magnetic entropy change shows great potential for magnetocaloric refrigeration but is hindered by large thermal and magnetic hysteresis effects, such as in the MM'X alloys (M, M' = 3d transition element, X = Si, Ge). While progress has been made in reducing thermal hysteresis through improved geometric compatibility, the joint effects of thermal and magnetic hysteresis are not well understood, which is a crucial issue in the practical operation of magnetocaloric refrigeration. In this work, we present an in-situ study of the temperature effects on the magnetic-field-driven magneto-structural transition in MnCoGe-based compounds. Our results show that the metamagnetic transition from paramagnetic hexagonal to ferromagnetic orthorhombic structures is more easily driven by an external magnetic field during cooling compared to heating. The magnetization loop exhibits larger hysteresis losses during cooling, while the magneto-structural transition temperature determined from iso-field magnetizations is more affected by the magnetic field. Additionally, the negative thermal expansion behavior displays a more uniform distribution within the entire phase transition temperature window during cooling. In-situ X-ray diffraction measurements and geometric nonlinear theory analysis suggest that those discrepancies during heating and cooling originate from smaller lattice geometric incompatibilities, particularly along the a -axis of the orthorhombic structure. Furthermore, it is found that the transformation stretch tensor eigenvalues exhibit linear behavior, converging towards 1 and indicating improved compatibility, potentially leading to reduced thermal hysteresis effects at lower temperatures. These findings offer insights into magneto-structural transitions and hysteresis behaviors, informing the development of high-performance magnetocaloric materials.

关键词：

来源：评论

学校读者我要写书评

暂无评论

CoordField: Coordination Field for Agentic UAV Task Allocation In Low-altitude Urban Scenarios

arXiv

引用

arXiv 2025年

作者： Zhang, Tengchao Tian, Yonglin Lin, Fei Huang, Jun Süli, Patrik P. Qin, Rui Wang, Fei-Yue Department of Engineering Science Faculty of Innovation Engineering Macau University of Science and Technology 999078 China State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China Doctoral School of Applied Informatics and Applied Mathematics Óbuda University Hungary Laboratory of Computation and Analytics of Complex Management Systems Tianjin University Tianjin300072 China Research Center for Chinese Economics and Social Security The University of Chinese Academy of Sciences Beijing100190 China

With the increasing demand for heterogeneous Unmanned Aerial Vehicle (UAV) swarms to perform complex tasks in urban environments, system design now faces major challenges, including efficient semantic understanding, flexible task planning, and the ability to dynamically adjust coordination strategies in response to evolving environmental conditions and continuously changing task requirements. To address the limitations of existing approaches, this paper proposes coordination field agentic system for coordinating heterogeneous UAV swarms in complex urban scenarios. In this system, large language models (LLMs) is responsible for interpreting high-level human instructions and converting them into executable commands for the UAV swarms, such as patrol and target tracking. Subsequently, a Coordination field mechanism is proposed to guide UAV motion and task selection, enabling decentralized and adaptive allocation of emergent tasks. A total of 50 rounds of comparative testing were conducted across different models in a 2D simulation space to evaluate their performance. Experimental results demonstrate that the proposed system achieves superior performance in terms of task coverage, response time, and adaptability to dynamic changes. Copyright © 2025, The Authors. All rights reserved.

关键词： Drones

来源：评论

学校读者我要写书评

暂无评论

Hunting for the host galaxy groups of binary black holes and the application in constraining hubble constant

arXiv

引用

arXiv 2020年

作者： Yu, Jiming Wang, Yu Zhao, Wen Lu, Youjun CAS Key Laboratory for Researches in Galaxies and Cosmology Department of Astronomy University of Science and Technology of China Chinese Academy of Sciences Hefei Anhui230026 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China CAS Key Laboratory for Computational Astrophysics National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China School of Astronomy and Space Science University of Chinese Academy of Sciences Beijing100049 China

The discovery of gravitational-wave (GW) signals, produced by the coalescence of stellar-mass binary black holes (SBBHs), opens a new window to study the astrophysical origins and dynamical evolutions of compact binaries. In addition, these GW events can be treated as the standard sirens to constrain various cosmological parameters. Both issues require the host identification for these GW events, with help of the spatial resolution of GW detector networks. In this paper, we investigate the capabilities of various detector networks for identifying the SBBHs' host galaxy groups, rather than their host galaxies, which can overcome the influence of galaxies' proper motions in dark matter halos for measuring the cosmological parameters. In our analysis, the group catalog of SDSS DR7 with redshift z ∈ (0:01;0:1) is considered as an example of the application. We find that for the second-generation (2G) detector network, the host galaxy groups of around 17% 30 - 30 Mo SBBHs can be identified. For the 3G detector network, this fraction becomes ∼ 99%. We also investigate the potential constraint on the Hubble constant H0 by these GW events, if their redshift information is extracted from the candidates of host galaxy groups. We find that, by five-year observations, 2G detector network is expected to give a constraint of ΔH0=H0 ∼ (1%;4%), which can be more than two order smaller if considering the 3G detector network. Copyright © 2020, The Authors. All rights reserved.

关键词： Stars

来源：评论

学校读者我要写书评

暂无评论

HR-GO I: Comprehensive NLTE abundance analysis of the Cetus stream

arXiv

引用

arXiv 2024年

作者： Sitnova, T.M. Yuan, Z. Matsuno, T. Mashonkina, L.I. Alexeeva, S.A. Holmbeck, E. Sestito, F. Lombardo, L. Banerjee, P. Martin, N.F. Jiang, F. Institute of Astronomy Russian Academy of Sciences Pyatnitskaya 48 Moscow119017 Russia School of Astronomy and Space Science Nanjing University Nanjing210093 China Key Laboratory of Modern Astronomy and Astrophysics Nanjing University Ministry of Education Nanjing210093 China Université de Strasbourg CNRS Observatoire astronomique de Strasbourg UMR 7550 StrasbourgF-67000 France Astronomisches Rechen-Institut Zentrum für Astronomie Universität Heidelberg Mönchhofstraße 12-14 Heidelberg69120 Germany CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China The Observatories of the Carnegie Institution for Science 813 Santa Barbara Street PasadenaCA91101 United States Department of Physics and Astronomy University of Victoria PO Box 3055 STN CSC VictoriaBCV8W 3P6 Canada Max-von-Laue-Str. 12 Frankfurt am Main60438 Germany Department of Physics Indian Institute of Technology Palakkad Kerala 678558 India Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China

Context. Dwarf galaxy streams encode vast amounts of information essential to understanding early galaxy formation and nucleosynthesis channels. Due to the variation in the timescales of star formation history in their progenitors, stellar streams serve as ‘snapshots’ that record different stages of galactic chemical evolution. Aims. This study focusses on the Cetus stream, stripped from a low-mass dwarf galaxy. We aim to uncover its chemical evolution history as well as the different channels of its element production from detailed elemental abundances. Methods. We carried out a comprehensive analysis of the chemical composition of 22 member stars based on their high-resolution spectra. We derived abundances for up to 28 chemical species from C to Dy and, for 20 of them, we account for the departures from local thermodynamic equilibrium (NLTE effects). Results. We confirm that the Cetus stream has a mean metallicity of [Fe/H] = −2.11 ± 0.21. All observed Cetus stars are α enhanced with [α/Fe] 0.3. The absence of the α-‘knee’ implies that star formation stopped before iron production in type Ia supernovae (SNe Ia) became substantial. Neutron capture element abundances suggest that both the rapid (r-) and the main slow (s-) processes contributed to their origin. The decrease in [Eu/Ba] from a typical r-process value of [Eu/Ba] = 0.7 to 0.3 with increasing [Ba/H] indicates a distinct contribution of the r- and s-processes to the chemical composition of different Cetus stars. For barium, the r-process contribution varies from 100% to 20% in different sample stars, with an average value of 50%. Conclusions. Our abundance analysis indicates that the star formation in the Cetus progenitor ceased after the onset of the main s-process in low- to intermediate-mass asymptotic giant branch stars but before SNe Ia played an important role. A distinct evolution scenario is revealed by comparing the abundances in the Ursa Minor dwarf spheroidal galaxy, showing the diversity in —a

关键词： Supernovae

来源：评论

学校读者我要写书评

暂无评论

Training Time Minimization for Federated Edge Learning with Optimized Gradient Quantization and Bandwidth Allocation

arXiv

引用

arXiv 2021年

作者： Liu, Peixi Jiang, Jiamo Zhu, Guangxu Cheng, Lei Jiang, Wei Luo, Wu Du, Ying Wang, Zhiqin State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Shenzhen Research Institute of Big Data Shenzhen China China Academy of Information and Communications Technology China College of Information Science and Electronic Engineering Zhejiang University Hangzhou China

Training a machine learning model with federated edge learning (FEEL) is typically time-consuming due to the constrained computation power of edge devices and limited wireless resources in edge networks. In this paper, the training time minimization problem is investigated in a quantized FEEL system, where the heterogeneous edge devices send quantized gradients to the edge server via orthogonal channels. In particular, a stochastic quantization scheme is adopted for compression of uploaded gradients, which can reduce the burden of per-round communication but may come at the cost of increasing number of communication rounds. The training time is modeled by taking into account the communication time, computation time and the number of communication rounds. Based on the proposed training time model, the intrinsic trade-off between the number of communication rounds and per-round latency is characterized. Specifically, we analyze the convergence behavior of the quantized FEEL in terms of the optimality gap. Further, a joint data- and-model-driven fitting method is proposed to obtain the exact optimality gap, based on which the closed-form expressions for the number of communication rounds and the total training time are obtained. Constrained by total bandwidth, the training time minimization problem is formulated as a joint quantization level and bandwidth allocation optimization problem. To this end, an algorithm based on alternating optimization is proposed, which alternatively solves the subproblem of quantization optimization via successive convex approximation and the subproblem of bandwidth allocation via bisection search. With different learning tasks and models, the validation of our analysis and the near-optimal performance of the proposed optimization algorithm are demonstrated by the experimental results. © 2021, CC BY-NC-SA.

关键词： Economic and social effects

来源：评论

学校读者我要写书评

暂无评论

Comprehensive analysis of T-2 toxin contamination in maize from Northeast China using automated immunomagnetic beads system coupled with LC-MS/MS

引用

Food Chemistry 2025年 490卷

作者： Jinnan Chen Di Cai Peng Li Jin Ye Meng Wang Yu Wu Li Li Hongmei Liu Qinghui Zhang Yao Qin Quan Pan Songxue Wang Academy of National Food and Strategic Reserves Administration NFSRA Key Laboratory of Grain and Oil Quality and Safety Beijing 100037 PR China College of Information Science and Engineering Henan University of Technology Zhengzhou 450001 PR China School of Automation Northwestern Polytechnical University Xi'an 710072 PR China

This study developed an immunomagnetic beads (IMB)-based high-throughput, automated, magneto-controlled pretreatment system coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) for accurate analysis of T-2 toxin in grains and feeds. The method demonstrated good linearity and sensitivity toward T-2 toxin, with detection and quantification limits of 0.13 and 0.43 μg/kg, respectively. Under optimized conditions, the recovery rates of spiked T-2 toxin in samples ranged from 85.2 % to 103.3 %, with relative standard deviations below 7.2 %. To our knowledge, this is the first large-scale regional investigation in China on the contamination of T-2 toxin in maize. analysis of 842 samples using this method showed a 10.8 % detection rate for T-2 toxin, with contamination levels increasing at higher latitude. Historical climatic data and risk assessments suggest that relatively low temperatures may be one of favorable factors of T-2 toxin growth.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An ionic covalent organic framework showing super-performance for recovery of gold from e-waste

引用

Separation and Purification technology 2025年 375卷

作者： Liu, Xing Liu, Yuxuan Guo, Liecheng Gong, Lele Xie, Xianqing Yu, Zhiwu Luo, Feng School of Chemistry and Materials Science East China University of Technology Nanchang330013 China State Key Laboratory of NBC Protection for Civilian Beijing100191 China National Engineering Research Center for Carbonhydrate Synthesis Jiangxi Normal University Nanchang330027 China High Magnetic Field Laboratory Chinese Academy of Sciences Anhui Hefei230031 China

Recovery of gold from e-waste is now highly desirable from the viewpoint of both environmental protection and sustainable development. Herein, we report a novel ionic COF (covalent organic framework, ECUT-COF-26) for such use. Through both electrostatic interaction and photocatalytic reduction, ECUT-COF-26 enables an ultrafast gold extraction efficiency with a removal efficiency of >99 % within 1 min and a super-high extraction capacity of 5.3 g/g. Such value far exceeds most of the established materials for such use. ECUT-COF-26 is also found to give an impressively ultrastrong concentrating ability with a reduction of gold concentration down to 1.2 ug/L within 60 min, a super-high selectivity (SAu/M = ∼106) and a good recycling ability. Its practical application is confirmed by a gold recovery from e-waste with a 100 % gold recovery and a gold production in a 23.8 Karat purity (99.3 %). © 2025 Elsevier B.V.

关键词： Recycling

来源：评论

学校读者我要写书评

暂无评论

Diversified rotation systems improve grain yield and water use efficiency of winter wheat under limited irrigation in the North China Plain

引用

Crop Journal 2025年

作者： Yang, Lei Cheng, Lang Wang, Pin Zhao, Huiling Zhao, Jie Zang, Huadong Yang, Yadong Zeng, Zhaohai State Key Laboratory of Maize Bio-breeding College of Agronomy and Biotechnology China Agricultural University Beijing 100193 China Crop Research Institute Anhui Academy of Agricultural Sciences Anhui Hefei 230031 China College of Plant Science and Technology Huazhong Agricultural University Hubei Wuhan 430070 China

Diversifying crop rotation aims to balance production and ecological concerns. However, yield and water use efficiency (WUE) of crop in diversified rotation systems have not been well documented, especially under limited irrigation. Here, we conducted a 6-year experiment with five treatments: 1) wheat-maize cropping system (WM), as control;2) WMME, spring maize → WM rotation;3) WMML, spring millet → WM rotation;4) WMMP, spring peanut → WM rotation;and 5) WMMS, spring soybean → WM rotation, to explore how diversified rotations affected yield and WUE of wheat. Results showed that approximately 60% higher precipitation during wheat growing season in Cycle 1 (2015–2017) resulted in yield increases by 33.8%–55.7% compared to those in Cycle 2 (2017–2019) and Cycle 3 (2019–2021). Grain yield and WUE of wheat were 16.7% and 9.6% higher in Cycle 1, 81.5% and 86.8% higher in Cycle 2, and 56.1% and 78.7% higher in Cycle 3 on average in diversified rotations compared to those in WM, respectively. Further analysis revealed that spike number and aboveground biomass were the main contributors to the increments, which can be explained by the increased evapotranspiration during the middle-late wheat growth stages (e.g., regreening, jointing, and anthesis) in diversified rotations. In general, diversified rotations enhanced synchronization of soil water supply with crop water demand by affecting the spatiotemporal dynamics of soil moisture under varied precipitation conditions, thereby increasing yield and WUE of wheat. Hence, diversified spring crops → WM rotations offer a sustainable and efficient strategy for enhancing wheat production and water conservation in dry areas. © 2025 Crop science Society of China and Institute of Crop science, CAAS

关键词： Evapotranspiration Rotation system Soil water storage Yield component

来源：评论

学校读者我要写书评

暂无评论

[email protected] mineralized MOF as a sensing immunoprobe in detection of aflatoxin B 1

引用

Biosensors and Bioelectronics 2023年 220卷

作者： Xiaoning Liao Xue Zhang Wenjun Wang Chanjuan Liu Wuying Yang Dan Wang Research Center of Mycotoxins Jiangxi Agricultural University Nanchang 330045 China Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables/Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits &Vegetables in Jiangxi Province Jiangxi Agricultural University Nanchang 330045 China Key Lab for Agro-product Processing and Quality Control of Nanchang City College of Food Science and Engineering Jiangxi Agricultural University Nanchang 330045 China Agricultural Biotechnology Analysis and Testing Center Jiangxi Agricultural University Nanchang 330045 China

Nanobody(Nb) is too small to carry more signal reporters, which often leads to low sensitivity in immunoassay. Herein, we proposed a novel immunoprobe integration of Nb and biomimetic mineralized metal-organic frameworks(MOF), in which plenty of succinylated horseradish peroxidase(sHRP) were encapsulated within a single MOF and the Nb was assembled on the biomimetic mineralized MOF. It overcomes the dilemma that the Nb is difficult to carry more signal reporters. Meanwhile, the mineralized MOF can protect the sHRP from denaturation and facilitate the transport of substrates to the active sites of sHRP. Electrosensing of aflatoxin B 1 (AFB 1 ) was realized with a competitive format in which the target AFB 1 and immobilized artificial antigen were competing for binding with the immunoprobe. Additionally, the detection signal was enlarged by the catalysis of this immunoprobe to 4-chloro-1-naphthol for producing precipitations, which blocked the channels of the immunoprobe and the redox probes of Fe(CN) 6 3−/4− was difficult to reach the electrode surface through the channels. Hence, the as-prepared immunosensor exhibited good voltammetry responses towards the determined AFB 1 in a linear range of 50.0 fg/mL - 20.0 ng/mL with a detection limit of 20.0 fg/mL. The specificity, stability, and reproducibility of this immunosensor were satisfactory. This work may provide an alternative idea for the application of Nb in immunoassay, and the idea may also be applicable to other bio-recognition elements for immunoassay.

关键词： Nanobody Aflatoxin B 1 Immunoprobe Immunoassay Biomimetic mineralization of MOF

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：