检索结果-内蒙古大学图书馆

Strengthening-softening transition and maximum strength in Schwarz nanocrystals

Nano Materials Science 2024年第3期6卷 320-328页

作者： Hanzheng Xing Jiaxi Jiang Yujia Wang Yongpan Zeng Xiaoyan Li Center for Advanced Mechanics and Materials Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A*STAR)Singapore138632Singapore

Recently,a Schwarz crystal structure with curved grain boundaries(GBs)constrained by twin-boundary(TB)networks was discovered in nanocrystalline Cu through experiments and atomistic *** Cu with nanosized Schwarz crystals exhibited high strength and excellent thermal ***,the grainsize effect and associated deformation mechanisms of Schwarz nanocrystals remain ***,we performed large-scale atomistic simulations to investigate the deformation behaviors and grain-size effect of nanocrystalline Cu with Schwarz *** simulations showed that similar to regular nanocrystals,Schwarz nanocrystals exhibit a strengthening-softening transition with decreasing grain *** critical grain size in Schwarz nanocrystals is smaller than that in regular nanocrystals,leading to a maximum strength higher than that of regular *** simulations revealed that the softening in Schwarz nanocrystals mainly originates from TB migration(or detwinning)and annihilation of GBs,rather than GB-mediated processes(including GB migration,sliding and diffusion)dominating the softening in regular *** analyses of simulation data further showed that compared with those in regular nanocrystals,the GB-mediated processes in Schwarz nanocrystals are suppressed,which is related to the low volume fraction of amorphous-like GBs and constraints of TB *** smaller critical grain size arises from the suppression of GB-mediated processes.

关键词： Schwarz nanocrystal Curved grain boundary Atomistic simulation Grain size effect Maximum strength

来源：评论

学校读者我要写书评

暂无评论

Interpretable machine learning optimization(InterOpt)for operational parameters:A case study of highly-efficient shale gas development

引用

Petroleum Science 2023年第3期20卷 1788-1805页

作者： Yun-Tian Chen Dong-Xiao Zhang Qun Zhao De-Xun Liu Eastern Institute for Advanced Study Zhejiang315200China Department of Mathematics and Theories Peng Cheng LaboratoryGuangdong518055China National Center for Applied Mathematics Shenzhen(NCAMS) Southern University of Science and TechnologyGuangdong518055China Research Institute of Petroleum Exploration and Development CNPCBejing100083China

An algorithm named InterOpt for optimizing operational parameters is proposed based on interpretable machine learning,and is demonstrated via optimization of shale gas *** consists of three parts:a neural network is used to construct an emulator of the actual drilling and hydraulic fracturing process in the vector space(i.e.,virtual environment);:the Sharpley value method in inter-pretable machine learning is applied to analyzing the impact of geological and operational parameters in each well(i.e.,single well feature impact analysis):and ensemble randomized maximum likelihood(EnRML)is conducted to optimize the operational parameters to comprehensively improve the efficiency of shale gas development and reduce the average *** the experiment,InterOpt provides different drilling and fracturing plans for each well according to its specific geological conditions,and finally achieves an average cost reduction of 9.7%for a case study with 104 wells.

关键词： Interpretable machine learning Operational parameters optimization Shapley value Shale gas development Neural network

来源：评论

学校读者我要写书评

暂无评论

A survey on federated learning:a perspective from multi-party computation

引用

Frontiers of Computer Science 2024年第1期18卷 93-103页

作者： Fengxia LIU Zhiming ZHENG Yexuan SHI Yongxin TONG Yi ZHANG Institute of Artificial Intelligence and Key Laboratory of Mathematics Informatics Behavioral Semantics Beihang UniversityBeijing 100191China State Key Laboratory of Software Development Environment and Advanced Innovation Center for Future Blockchain and Privacy Computing Beihang UniversityBeijing 100191China Pengcheng Laboratory Shenzhen 518055China Zhongguancun Laboratory Beijing 100190China Institute for Mathematical Sciences and Engineering Research Center of Financial Computing and Digital Engineering Renmin University of ChinaBeijing 100872China

Federated learning is a promising learning paradigm that allows collaborative training of models across multiple data owners without sharing their raw *** enhance privacy in federated learning,multi-party computation can be leveraged for secure communication and computation during model *** survey provides a comprehensive review on how to integrate mainstream multi-party computation techniques into diverse federated learning setups for guaranteed privacy,as well as the corresponding optimization techniques to improve model accuracy and training *** also pinpoint future directions to deploy federated learning to a wider range of applications.

关键词： sfederated learning multi-party ycomputation privacy-preserving data mining distributed learning

来源：评论

学校读者我要写书评

暂无评论

Phonon-limited mobility for electrons and holes in highly-strained silicon

引用

npj Computational Materials 2024年第1期10卷 673-683页

作者： Nicolas Roisin Guillaume Brunin Gian-Marco Rignanese Denis Flandre Jean-Pierre Raskin Samuel Poncé Institute of Information and Communication Technologies Electronics and Applied MathematicsUniversitécatholique de LouvainLouvain-la-NeuveBelgium European Theoretical Spectroscopy Facility Institute of Condensed Matter and NanosciencesUniversitécatholique de LouvainLouvain-la-NeuveBelgium Matgenix A6K Advanced Engineering CenterCharleroiBelgium WEL Research Institute WavreBelgium

Strain engineering is a widely used technique for enhancing the mobility of charge carriers in semiconductors,but its effect is not fully *** this work,we perform first-principles calculations to explore the variations of the mobility of electrons and holes in silicon upon deformation by uniaxial strain up to 2%in the[100]crystal direction.

关键词： mobility strained electrons

来源：评论

学校读者我要写书评

暂无评论

Multi-source data fusion evaluation method based on Uncertainty Quantification and Bayes method for success-failure type test 5

Multi-source data fusion evaluation method based on Uncertai...

引用

5th International Conference on Computer Information Science and Artificial Intelligence, CISAI 2022

作者： Wang, Jiajia He, Jingyuan Ma, Jing Beijing Jinghang Research Institute of Computing and Communication Beijing China Applied Mathematics Research Center of China Aerospace Science and Industry Group Beijing China

ISBN: (纸本)9781510662520

In this paper, we use Uncertainty Quantification method to analyse the data from three types of success-failure type test sources: physical test, semi-physical test and computer simulation test. Bayes method is used to evaluate the data fusion of multiple source test, and the validity and applicability of the method are verified by experiments. © 2023 SPIE.

关键词： Data fusion

来源：评论

学校读者我要写书评

暂无评论

Prediction of Success Probability of Multivariate Tests Based on Lasso 3

Prediction of Success Probability of Multivariate Tests Base...

引用

3rd International Conference on applied mathematics, Modelling, and Intelligent computing, CAMMIC 2023

作者： Wang, Jiajia Ma, Jing Liang, Hange Hou, Jian Li, Na Beijing Jinghang Research Institute of Computing and Communication Beijing China Applied Mathematics Research Center of China Aerospace Science and Industry Group Beijing China

This paper predicts the success probability of successful or unsuccessful multivariate tests, uses Lasso regression method to fit the input data, mining information from different dimensions of input data to analyze t... 详细信息

ISBN: (数字)9781510667617

ISBN: (纸本)9781510667600

关键词： Regression analysis

来源：评论

学校读者我要写书评

暂无评论

research on Fusion evaluation of numerical and real tests based on prior information reliability

Research on Fusion evaluation of numerical and real tests ba...

引用

2023 International Conference on Electronic Information Engineering and Data Processing, EIEDP 2023

作者： Ma, Jing Wang, Jiajia Hou, Jian Liang, Hange Beijing Jinghang Research Institute of Computing and Communication Beijing China Applied Mathematics Research Center of China Aerospace Science and Industry Group Beijing China

ISBN: (纸本)9781510666160

In view of the characteristics of multiple test types and evaluation indexes of information equipment performance, this paper studies the reliability measurement of prior information from different sources of test information, such as physical test, semi-physical test, simulation test and physical substitution test, starting from the distribution difference of test data, and carries out the research on the fusion evaluation method of numerical and real tests based on prior information, to improve the test efficiency, shorten the development period, reduce the test cost, and provide technical and theoretical support for obtaining more reliable equipment test evaluation results. © 2023 SPIE.

关键词： Numerical methods

来源：评论

学校读者我要写书评

暂无评论

A survey on lattice‑based digital signature

引用

Cybersecurity 2025年第2期8卷 42-59页

作者： Fengxia Liu Zhiyong Zheng Zixian Gong Kun Tian Yi Zhang Zhe Hu Jia Li Qun Xu Institute of Artificial Intelligence Beihang UniversityBeijing 100191People’s Republic of China Beijing Advanced Innovation Center for Future Blockchain and Privacy Computing BeijingPeople’s Republic of China Engineering Research Center of Ministry of Education for Financial Computing and Digital Engineering Renmin University of ChinaBeijing 100872People’s Republic of China School of Mathematics Renmin University of ChinaBeijing 100872People’s Republic of China

Lattice-based digital signature has become one of the widely recognized post-quantum algorithms because of its simple algebraic operation,rich mathematical foundation and worst-case security,and also an important tool for constructing *** survey explores lattice-based digital signatures,a promising post-quantum resistant alternative to traditional schemes relying on factoring or discrete logarithm problems,which face increasing risks from quantum *** study covers conventional paradigms like Hash-and-Sign and Fiat-Shamir,as well as specialized applications including group,ring,blind,and proxy *** analyzes the versatility and security strengths of lattice-based schemes,providing practical *** chapter summarizes advancements in schemes,identifying emerging *** also pinpoint future directions to deploy lattice-based digital signatures including quantum cryptography.

关键词： Post-quantum cryptography Lattice-based cryptography Lattice-based digital signatures

来源：评论

学校读者我要写书评

暂无评论

Phase-coherence dynamics of frequency-comb emission via high-order harmonic generation in few-cycle pulse trains

引用

Chinese Physics B 2023年第3期32卷 205-211页

作者：梁畅通张晶晶李鹏程 Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of the Ministry of Education Shantou UniversityShantou 515063China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Frequency-comb emission via high-order harmonic generation(HHG)provides an alternative method for the coherent vacuum ultraviolet(VUV)and extreme ultraviolet(XUV)radiation at ultrahigh repetition *** particular,the temporal and spectral features of the HHG were shown to carry profound insight into frequency-comb emission *** we present an ab initio investigation of the temporal and spectral coherence of the frequency comb emitted in HHG of He atom driven by few-cycle pulse *** find that the emission of frequency combs features a destructive and constructive coherences caused by the phase interference of HHG,leading to suppression and enhancement of frequency-comb *** results reveal intriguing and substantially different nonlinear optical response behaviors for frequency-comb emission via *** dynamical origin of frequency-comb emission is clarified by analyzing the phase coherence in HHG processes in *** results provide fresh insight into the experimental realization of selective enhancement of frequency comb in the VUV–XUV regimes.

关键词： high-order harmonic generation frequency comb time-dependent Schro¨dinger equation intense laser field systems

来源：评论

学校读者我要写书评

暂无评论

Comprehensive optimization of piezoelectric coefficient and depolarization temperature in Mn-doped Bi_(0.5)Na_(0.5)TiO_(3)-Bi_(0.5)K_(0.5)TiO_(3)-BaTiO_(3)lead-free piezoceramics

引用

Journal of Materials Science & Technology 2024年第5期172卷 255-263页

作者： Huashan Zheng Enwei Sun Huajie Luo Xiaoyu Zhang Yixiao Yang Bin Yang Rui Zhang Shantao Zhang Wenwu Cao Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin150080China Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing100083China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Mathematics and Materials Research Institute The Pennsylvania State UniversityUniversity ParkPennsylvania16802United States of America

Lead-free Bi_(_(0.5))Na_(_(0.5))TiO_(3)(BNT)piezoelectric ceramics have the advantages of large coercive fields and high Curie *** the improvement of piezoelectric coefficient(d 33)is usually accompanied by a huge sacrifice of depolarization temperature(T d).In this work,a well-balanced performance of d 33 and T d is achieved in MnO_(2)-doped 0.79(Bi_(_(0.5))Na_(_(0.5))TiO_(3))-0.14(Bi_(0.5)K_(0.5)TiO_(3))-0.07BaTiO_(3)ternary *** in-corporation of 0.25 mol%MnO_(2)enhances the d 33 by more than 40%,while T d remains almost unchanged(i.e.,d 33=181 pC/N,T d=184℃).X-ray diffraction(XRD)shows that an appropriate fraction of the small axis-ratio ferroelectric phase(pseudo-cubic,P c)coexists with the long-range ferroelectric phase(tetrag-onal,T)under this MnO_(2)*** force microscopy(PFM)has revealed a special domain configuration,namely large striped and layered macro domains embedded with small *** study provides a distinctive avenue to design BNT-based piezoelectric ceramics with high piezoelectric performance and temperature stability.

关键词： BNT-BKT-BT ceramics Mn doping Piezoelectric Depolarization temperature Phase structure

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：