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Graphene photonic crystal fiber with large modulation depth

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Science China Chemistry 2020年第1期63卷 5-6页

作者： Yang Xu chao Gao College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027China

Optical fiber communication has become an important pillar of information technology in the 21 st century due to its advantages of large communication capacity,small signal in terference and good *** the increasing demand for larger capacity,multi-function and security of optical network,the advantages of photonic crystal fiber(PCF)in optical transmission and regulation are gradually emerging[1,2].In particular,the combination of PCF with some functional materials has greatly broadened the application fields of optical ***,as a functional film with high mobility,broadband absorption and adjustable electrical properties,is a promising material for the next generation of photonic and photoelectronic applications[3-5].

关键词： fiber communication network

A Machine Learning Framework with Feature Selection for Floorplan Acceleration in IC Physical Design

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Journal of Computer Science & Technology 2020年第2期35卷 468-474页

作者： Shu-Zheng Zhang Zhen-Yu Zhao chao-chao Feng Lei Wang College of Computer Science and Technology National University of Defense TechnologyChangsha 410003China

Floorplan is an important process whose quality determines the timing closure in integrated circuit(IC)physical *** generating a floorplan with satisfying timing result is time-consuming because much time is spent on the generation-evaluation *** machine learning to the floorplan stage is a potential method to accelerate the floorplan ***,there exist two challenges which are selecting proper features and achieving a satisfying model *** this paper,we propose a machine learning framework for floorplan acceleration with feature selection and model stacking to cope with the challenges,targeting to reduce time and effort in integrated circuit physical ***,the proposed framework supports predicting post-route slack of static random-access memory(SRAM)in the early floorplan ***,we introduce a feature selection method to rank and select important *** both feature importance and model accuracy,we reduce the number of features from 27 to 15(44%reduction),which can simplify the dataset and help educate novice ***,we build a stacking model by combining different kinds of models to improve *** 28 nm technology,we achieve the mean absolute error of slacks less than 23.03 ps and effectively accelerate the floorplan process by reducing evaluation time from 8 hours to less than 60 *** on our proposed framework,we can do design space exploration for thousands of locations of SRAM instances in few seconds,much more quickly than the traditional *** practical application,we improve the slacks of SRAMs more than 75.5 ps(177%improvement)on average than the initial design.

关键词： physical design machine learning feature selection design space exploration

The Linear Unicyclic Hypergraph with the Second or Third Largest Spectral Radius

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维普期刊数据库

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Acta Mathematica Sinica,English Series 2020年第10期36卷 1140-1150页

作者： chao DING Yi Zheng FAN Jiang chao WAN School of Mathematics and Physics Anqing Normal UniversityAnqing 246133P.R.China School of Mathematical Sciences Anhui UniversityHefei 230601P.R.China

The spectral radius of a uniform hypergraph is defined to be that of the adjacency tensor of the *** is known that the unique unicyclic hypergraph with the largest spectral radius is a nonlinear hypergraph,and the unique linear unicyclic hypergraph with the largest spectral radius is a power *** this paper we determine the unique linear unicyclic hypergraph with the second or third largest spectral radius,where the former hypergraph is a power hypergraph and the latter hypergraph is a non-power hypergraph.

关键词： Linear unicyclic hypergraph adjacency tensor spectral radius weighted incident matrix

APPLICATION OF MAXIMUM ENTROPY PRINCIPLE METHOD TO THE STUDY OF WAVE CLIMATE STATISTICAL CHARACTERISTICS

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Journal of Hydrodynamics 2004年第4期16卷 417-422页

作者： XUFu-min XUEHong-chao CollegeofTrafficandOceanEngineering HohaiUniversityNanjing210098China

The Maximum Entropy Principle (MEP) method is elaborated, and thecorresponding probability density evaluation method for the random fluctuation system is introduced,the goal of the article is to find the best fitting method for the wave climate statisticaldistribution. For the first time, a kind of new maximum entropy probability distribution (MEPdistribution) expression is deduced in accordance with the second order moment of a random *** from all the fitting methods in the past, the MEP distribution can describe theprobability distribution of any random fluctuation system conveniently and reasonably. If themoments of the random signal is limited to the second order, that is, the ratio of theroot-mean-square value to the mean value of the random variable is obtained from the random sample,the corresponding MEP distribution can be computed according to the deduced expression in thisessay. The concept of the wave climate is introduced here, and the MEP distribution is applied tofit the probability density distributions of the significant wave height and spectral peak *** the Mexico Gulf as an example, three stations at different locations, depths and wind wavestrengths are chosen in the half-closed gulf, the significant wave height and spectral peak perioddistributions at each station are fitted with the MEP distribution, the Weibull distribution and theLog-normal distribution respectively, the fitted results are compared with the field observations,the results show that the MEP distribution is the best fitting method, and the Weibull distributionis the worst one when applied to the significant wave height and spectral peak period distributionsat different locations, water depths and wind wave strengths in the Gulf. The conclusion shows thefeasibility and reasonability of fitting wave climate statistical distributions with the deduced MEPdistributions in this essay, and furthermore proves the great potential of MEP method to the studyof wave sta

关键词： maximum entropy principle wave climate significant wave height spectralpeak period

Fragmentation for selection: how the deleterious mt DNA is removed in the female germline

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Science Bulletin 2019年第22期64卷 1646-1648页

作者： chao Tong MOE Key Laboratory for Biosystems Homeostasis & Protection and Innovation Center for Cell Signaling Network Life Sciences Institute Zhejiang University The Second Affiliated Hospital School of Medicine Zhejiang University

Mitochondria are the energy factories and metabolic centers of cells,and their malfunction can lead to multiple human *** highly dynamic organelles,mitochondria undergo frequent fission and fusion processes[1].The fusion process enables the exchange of inner materials between individual *** materials from healthy mitochondria could potentially compensate for the defects found in the defective *** processes not only increase the mitochondrial number but also separate the damaged parts of mitochondria from the healthy ones,thus,facilitating the elimination of the defective mitochondria through a process known as *** fusion leads to extra connections and branching of the mitochondria,whereas extra fission results in fragmentation of *** fusion and fission processes are differently tuned in various tissues to adapt to different physiological requirements[2].

关键词： removed branching elimination

Methods and advances in the study of aeroelasticity with uncertainties

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Chinese Journal of Aeronautics 2014年第3期27卷 461-474页

作者： Dai Yuting Yang chao School of Aeronautic Science and Engineering Beihang University

Uncertainties denote the operators which describe data error, numerical error and model error in the mathematical methods. The study of aeroelasticity with uncertainty embedded in the subsystems, such as the uncertainty in the modeling of structures and aerodynamics, has been a hot topic in the last decades. In this paper, advances of the analysis and design in aeroelasticity with uncertainty are summarized in detail. According to the non-probabilistic or probabilistic uncer- tainty, the developments of theories, methods and experiments with application to both robust and probabilistic aeroelasticity analysis are presented, respectively. In addition, the advances in aeroelastic design considering either probabilistic or non-probabilistic uncertainties are introduced along with aeroelastic analysis. This review focuses on the robust aeroelasticity study based on the structured singular value method, namely the ~t method. It covers the numerical calculation algo- rithm of the structured singular value, uncertainty model construction, robust aeroelastic stability analysis algorithms, uncertainty level verification, and robust flutter boundary prediction in the flight test, etc. The key results and conclusions are explored. Finally, several promising problems on aeroelasticity with uncertainty are proposed for future investigation.

关键词： Polynomial chaos expansion Probabilisticity Robustness Structured singular value Uncertainty

Micro-mixing in chemical reactors:A perspective

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Chinese Journal of Chemical Engineering 2017年第4期25卷 381-390页

作者： Zaisha Mao chao Yang Key Laboratory of Green Process and Engineering institute of Process Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Micro-mixing is an important mechanism, which works simultaneously with macro-mixing in chemical reactors in process industries, for achieving the best selectivity with respect to desired products. In about a half century, a huge amount of data and knowledge has been accumulated from theoretical and experimental studies on micromixing. Nevertheless, those results are mostly composites of simplified theoretical and empirical models, and the true nature of interactions of flow inhomogeneity and micro-mixing with chemical reaction has not been fully unveiled. This article reviews the progress in micro-mixing study in chemical reactors to date. A few important topics related to the nature, experimental evaluation, and numerical simulation of micro-mixing are *** suggestions are given hopefully to motivate more chemical engineers to devote their efforts to better understanding of micro-mixing in chemical reactors.

关键词： mixing simplified desired selectivity devote turbulence addressed accumulated reactant dispersed

Doping Electron Transporting Layer:An Effective Method to Enhance J_(SC)of All-Inorganic Perovskite Solar Cells

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Energy & Environmental Materials 2021年第4期4卷 500-501页

作者： chao Liang Guichuan Xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina

All-inorganic metal-halide CsPbBr_(3)perovskite has emerged as an attractive photovoltaic material for its outstanding environmental ***,due to the wide bandgap,the performance of CsPbBr_(3)perovskite solar cells(PSCs)is limited,especially for the short-circuit current density(J_(SC)).In this issue of Energy&Environmental Materials,Guo et *** Nb-doped SnO_(2)as electron transporting layers(ETLs),which could greatly improve the J_(SC)of the PSCs based on all-inorganic CsPbBr_(3).

关键词： all-inorganic perovskite depletion region width doping planar heterojunction

Single probes and resonant four-wave-mixing enabling novel correlative light electron microscopy workflow

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Light(Science & Applications) 2023年第6期12卷 933-934页

作者： Long Chen chao He Division of Structural Biology Wellcome Trust Centre for Human GeneticsUniversity of OxfordOxford OX37BNUK Department of Engineering Science University of OxfordOxford OX13PJUK

Correlative light electron microscopy prefers single probes with stable performance in both optical and electron *** researchers have shown how to harness gold nanoparticles featuring exceptional photostability and fo... 详细信息

关键词： mixing wave exceptional