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On-chip silicon photonic signaling and processing: a review

Science Bulletin 2018年第19期63卷 1267-1310页

作者： Jian Wang Yun long Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology

The arrival of the big data era has driven the rapid development of high-speed optical signaling and processing, ranging from long-haul optical communication links to short-reach data centers and highperformance computing, and even micro-/nano-scale inter-chip and intra-chip optical ***-chip photonic signaling is essential for optical data transmission, especially for chip-scale optical interconnects, while on-chip photonic processing is a critical technology for optical data manipulation or processing, especially at the network nodes to facilitate ultracompact data management with low power consumption. In this paper, we review recent research progress in on-chip photonic signaling and processing on silicon photonics platforms. Firstly, basic key devices (lasers, modulators, detectors)are introduced. Secondly, for on-chip photonic signaling, we present recent works on on-chip data transmission of advanced multi-level modulation signals using various silicon photonic integrated devices(microring, slot waveguide, hybrid plasmonic waveguide, subwavelength grating slot waveguide).Thirdly, for on-chip photonic processing, we summarize recent works on on-chip data processing of advanced multi-level modulation signals exploiting linear and nonlinear effects in different kinds of silicon photonic integrated devices (strip waveguide, directional coupler, 2D grating coupler, microring,silicon-orga.ic hybrid slot waveguide). Various photonic processing functions are demonstrated, such as photonic switch, filtering, polarization/wavelength/mode (de)multiplexing, wavelength conversion,signal regeneration, optical logic and computing. Additionally, we also introduce extended silicon+photonics and show recent works on on-chip graphene-silicon photonic signal processing. The advances in on-chip silicon photonic signaling and processing with favorable performance pave the way to integrate complete optical communication systems on a monolithic chip and integrate silicon

关键词： Photonic integration Silicon photonics Photonic signaling Photonic processing Optical communications Optical interconnects

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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

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DEVELOPMENT OF COUPLED 1D-2D MATHEMATICAL MODELS FOR TIDAL RIVERS

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Journal of Hydrodynamics 2004年第6期16卷 767-776页

作者： XUZu-xin YINHai-long StateKeyLaboratoryofPollutionControlandResourceReuse TongjiUniversityShanghai200092.China

Some coupled 1D-2D hydrodynamic and water quality models depicting tidalwater bodies with complex topography were presented. For the coupled models, finite element methodwas used to solve the governing equations so as to study tidal rivers with complex topography. Sincethe 1D and 2D models were coupled, the principle of model coupling was proposed to accountappropriately for the factors of water level, flow and pollutant flux and the related dynamicalbehavior was simulated. Specifically the models were used to probe quantitative pollutioncontribution of receiving water from neighboring Jiangsu and Zhejiang Provinces to the pollution inthe Huangpu River passing through Shanghai City, Numerical examples indicated that the developedcoupled 1D-2D models are applicable in tidal river network region of Shanghai.

关键词： tidal river hydrodynamic water quality coupled model Huangpu River Shanghai

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Biological object recognition approach using space variant resolution and pigeon-inspired optimization for UAV

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Science China(Technological Sciences) 2017年第10期60卷 1577-1584页

作者： XIN long XIAN Ning State Key Laboratory of 14rtual Reality Technology and Systems Beihang University Beijing 100191 China

Recognizing the target from a rotated and scaled image is an important and difficult task for computer vision. Visual system of humans has a unique space variant resolution mechanism(SVR) and log-polar transformations(LPT) is a mapping method that is invariant to rotation and scale. Motivated by biological vision, we propose a novel global LPT based template-matching algorithm(GLPT-TM) which is invariant to rotational and scale changes; and with pigeon-inspired optimization(PIO) used to optimize search strategy, a hybrid model of SVR and pigeon-inspired optimization(SVRPIO) is proposed to accomplish object recognition for unmanned aerial vehicles(UAV) with rotational and scale changes of the target. To demonstrate the efficiency, effectiveness and reliability of the proposed method, a series of experiments are carried out. By rotating and scaling the sample image randomly and recognizing the target with the method, the experimental results demonstrate that our proposed method is not only efficient due to the optimization, but effective and accurate in recognizing the target for UAV.

关键词： biological vision space variant resolution mechanism (SVR) log-polar transformations (LPT) pigeon-inspiredoptimization (PIO) object recognition

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Entropic force between biomembranes

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Acta Mechanica Sinica 2016年第5期32卷 970-975页

作者： long Li Fan Song State Key Laboratory of Nonlinear Mechanics (LNM) and Beijing Key Laboratory of Engineered Construction and Mechanobiology Institute of Mechanics Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Undulation force, an entropic force, stems from thermally excited fluctuations, and plays a key role in the essential interactions between neighboring surfaces of objects. Although the characteristics of the undulation force have been widely studied theoretically and experimentally,the distance dependence of the force, which constitutes its most fundamental characteristic, remains poorly *** this paper, first, we obtain a novel expression for the undulation force by employing elasticity and statistical mechanics and prove it to be in good agreement with existing experimental results. Second, we clearly demonstrate that the two representative forms of the undulation force proposed by Helfrich and Freund were respectively the upper and lower bounds of the present expression when the separation between membranes is sufficiently small, which was intrinsically different from the existing results where Helfrich＇s and Freund＇s forms of the undulation force were only suitable for the intermediate and small separations. The investiga.ions show that only in a sufficiently small separation does Helfrich＇s result stand for the undulation force with a large wave number and Freund＇s result express the force with a small wave number. Finally, a critical acting distance of the undulation force, beyond which the entropic force will rapidly decay approaching zero, is presented.

关键词： Undulation force Flexible membrane Entropic force Confined fluctuations

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In situ deformation behavior of TC21 titanium alloy with different α morphologies(equiaxed/lamellar)

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Rare Metals 2021年第5期40卷 1173-1181页

作者： Wei long Mei-Gui Ou Xi-Qin Mao Yi-long Liang College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of Guizhou Province Guizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology Guizhou UniversityGuiyang 550025China

To study the effect ofαphase morphology(equiaxedα(αE)/lamellarα(αL))on the in situ tensile behavior of TC21 alloy,the slip band,dislocation,crack initiation,and propaga.ion were analyzed by scanning electron microscopy(SEM)with in situ tensile stage and transmission electron microscopy(TEM).The results show that the slip bands first concentrate in theαE phases and easily truncate at theα/βphase boundaries,whereas the slip bands move across theαlamellae in theαL *** are easily generated inαE orα/βphase boundaries with large plastic *** the quantity ofαL is more thanαE,the crack tip is more easily deflected atαphases orαclusters with different orientations,making the main crack propaga.ion path more *** the volume fraction ratio ofαE toαL is~3:4,i.e.,the volume fraction ofαE is close to that ofαL,TC21 alloy exhibits better strength and slower crack propaga.ion rate.

关键词： In situ tensile TC21 alloy Equiaxed Lamellar αPhase

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Scale-Scale Correlation as Discriminant Among the Biased ga.axy Formation Models

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Chinese Physics Letters 2001年第5期18卷 711-714页

作者： FENG long-long XIANG Shou-Ping Centre for Astrophysics University of Science and Technology of ChinaHefei 230026 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

Using the mock ga.axy catalogues created from the N-body simulations,various biasing prescriptions for modeling the relative distribution between the ga.axies and the underlying dark matter are statistically tested by using scale-scale *** found that the scale-scale correlation is capable of breaking the model degeneracy indicated by the low order clustering statistics,and could be taken as an effective discriminant among a variety of biasing ***,comparing with the APM bright ga.axy catalogue,we infer that the two parameter Lagrangian biasing model gives the best fit to the observed clustering features.

关键词： ga.axy ga.axy breaking

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The effect of inlet conditions on the flow and heat transfer in multiple rotating cavity with axial throughflow

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航空动力学报 2007年第5期22卷 683-693页

作者： Christopher long Peter Childs TFMRC Department of Engineering and Design University of Sussex Brighton BN1 9QT UK

This paper discusses experimental results from two different build configurations of a heated multiple rotating cavity test rig. Measurements of heat transfer from the discs and tangential velocities are presented. The test rig is a 70% full scale version of a high pressure compressor stack of an axial ga. turbine engine. Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of these with a central axial throughflow of cooling air. Tests were carried out for a range of non-dimensional parameters representative of high pressure compressor internal air system flows (Reφup to 5×106 and ReΦup to 2×105).Two different builds have been tested. The most significant difference between these two build configurations is the size of the annular ga. between the (non-rotating) drive shaft and the bores of the discs. The heat transfer data were obtained from thermocouple measurements of surface temperature and a conduction solution method. The velocity measurements were made using a two component, LDA system. The heat transfer results from the discs show differences between the two builds. This is attributed to the wider annular ga. allowing more of the throughflow to penetrate into the cavity. There are also significant differences between the radial distributions of tangential velocity in the two builds of the test rig. For the narrow annular ga., there is an increase of non-dimensional tangential velocity Vφ/Ωr with radial location to solid body rotation Vφ/Ωr=*** the wider annular ga., the non-dimensional velocities show a decrease with radial location to solid body rotation.

关键词：轴向直流热转移旋转式孔进口接头

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Identification of multiple inputs single output errors-in-variables system using cumulant

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Journal of Systems Engineering and Electronics 2014年第6期25卷 921-933页

作者： Haihui long Jiankang Zhao Shanghai Key Laboratory of Naviga.ion and Location Based Services Shanghai Jiao Tong University

A higher-order cumulant-based weighted least square（HOCWLS） and a higher-order cumulant-based iterative least square（HOCILS） are derived for multiple inputs single output（MISO） errors-in-variables（EIV） systems from noisy input/output data. Whether the noises of the input/output of the system are white or colored, the proposed algorithms can be insensitive to these noises and yield unbiased estimates. To realize adaptive parameter estimates, a higher-order cumulant-based recursive least square（HOCRLS） method is also studied. Convergence analysis of the HOCRLS is conducted by using the stochastic process theory and the stochastic martinga.e theory. It indicates that the parameter estimation error of HOCRLS consistently converges to zero under a generalized persistent excitation condition. The usefulness of the proposed algorithms is assessed through numerical simulations.

关键词： parameter estimation multiple input systems recur-sive identification higher-order cumulant convergence analysis

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SP3-Hybridization Feature of Ag4 Superatom in Superatomic Molecules

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Li-juan Yan long-jiu Cheng Jin-long Yang Hefei National Laboratory of Physical Science at the Microscale University of Science and Technology of China Hefei 230026 China Department of Chemistry Anhui University Hefei 230601 China Hefei National Laboratory of Physical Science at the Microscale University of Science and Technology of China Hefei 230026 ChinaSynergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China

Analogous to atoms, superatoms can be used as building blocks to compose molecules and materials. To demonstrate this idea, the possibility of using tetrahedral Ag4 cluster to form a series of superatomic molecules Ag4X4 (X=H, Li, Na, K, Cu, Ag, Au and F, Cl, Br) is discussed. Based on the super valence bond model, a tetrahedral Ag4 cluster can be viewed as a 4-electron superatom, which can mimic a sp3 hybridization C atom. By comparison of the representative superatomic molecules Ag4X4 (X=Au, Cl) with the corresponding simple molecules CX4 (X=H, Cl), the similarities in terms of chemical bonding patterns and molecular orbitals (MOs) are conspicuous. Energy calculations predict that the Ag4 superatom can bind with all the involved liga.ds. Furthermore, the stabilities of superatomic molecules are enhanced by the large ga.s of the highest occupied molecular orbital and the lowest unoccupied molecular orbital (HOMO-LUMO ga.s) and high aromaticity. Our studies may find applications in assembling materials with superatoms.

关键词： Superatom Magic numbers Super valence bond Binding energy Aromaticity

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