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Chinese Journal of Structural Chemistry 2006年第9期25卷 1031-1034页

作者： CAI Wen-xuan WEN yi-Hang SU Hong FENG Yun-Long Institute of Physical Chemistry Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces Zhejiang Normal University Jinhua 321004 China

The title complex Zn（HL）（NCS）2 （C14H18N4OS2Zn, Mr = 387.81, HL = N-（3-dimethyl-aminopropyl）-salicylaldimine） has been synthesized by the reaction of ZnSO4·7H2O with the Schiff base N-（3-dimethylaminopropyl）-salicylaldimine derived from the condensation reaction of 3-dimethylamino- 1-propylamine with salicyladehyde. It crystallizes in the monoclinic system, space group P21/n with a = 9.8360（8）, b = 14.930（1）, c = 12.277（1） A, β= 101.455（2）°, V= 1767.0（3） A 3, Z = 4, F（000） = 800, Dc= 1.458 g/cm^3 and ,μ（MoKα） = 1.631 mm^-1. The structure was refined to R = 0.0463 and wR = 0.1065 for 2681 observed reflections （1 〉 2σ（I））. Crystal analyses revealed that the Zn（Ⅱ） atom is coordinated by two nitrogen atoms of two NCS^-, and an oxygen atom as well as a nitrogen atom of amine from the neutral Schiff base ligand of N-（3-dimethyl-aminopropyl）-salicylaldimine to give a distorted tetrahedral geometry.

关键词： 3-dimethylamino-1-propylamine salieylaldehyde Sehiff base,

Pretreating near infrared spectra with fractional order Savitzky–Golay differentiation(FOSGD)

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Chinese Chemical Letters 2015年第3期26卷 293-296页

作者： Kai-yi Zheng xuan Zhang Pei-Jin Tong Yuan Yao yi-Ping Du Shanghai Key Laboratory of Functional Materials Chemistry and Research Centre of Analysis and TestEast China University of Science and Technology Department of Chemical Engineering National Tsing Hua University

With the aid of Riemann–Liouville fractional calculus theory,fractional order Savitzky–Golay differentiation（FOSGD） is calculated and applied to pretreat near infrared（NIR） spectra in order to improve the performance of multivariate *** to integral order Savitzky–Golay differentiation（IOSGD）,FOSGD is obtained by fitting a spectral curve in a moving window with a polynomial function to estimate its coefficients and then carrying out the weighted average of the spectral curve in the window with the *** NIR datasets including diesel,wheat and corn datasets were utilized to test this *** results showed that FOSGD,which is easy to compute,is a general method to obtain Savitzky–Golay smoothing,fractional order and integral order *** order differentiation computation to the NIR spectra often improves the performance of the PLS model with smaller RMSECV and RMSEP than integral order ones,especially for physical properties of interest,such as density,cetane number and hardness.

关键词： Golay FOSGD fractional fitting smoothing utilized compute polynomial Liouville calibration

Multiple hierarchy risk assessment with hybrid model for safety enhancing of unmanned subscale BWB demonstrator flight test

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Chinese Journal of Aeronautics 2019年第12期32卷 2612-2626页

作者： yi LU Shuguang ZHANG Zejing ZHANG xuan ZHANG Peng TANG Shan FU Department of Automation School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Transportation Science and Engineering Beihang UniversityBeijing 100083China Airworthiness Technologies Research and Management Center China Aviation Polytechnology EstablishmentBeijing 100028China China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou 510610China School of Energy and Power Engineering Beihang UniversityBeijing 100083China

To explore the low-speed characteristics of the Blended-Wing-Body(BWB)configuration for future civil aircraft,a series of unmanned subscale demonstrators have been developed and tested by our research *** this process,specific safety risks deriving from uncertain design features,system unreliability,and insufficient personnel experience caused continuous flight test mishaps and the risk mechanism was not *** and trial-and-error learning driven safety improvements took few effects on mishap prevention,so our focus was turned to look for systematic safety *** paper establishes a systems theory based hybrid model to integrate the physical system reliability analysis techniques with the system dynamics method for illustrating the multiple risk interactions of the demonstrator flight test involving organizational,human resource and technical system *** the prior BB-5 demonstrator as a case,the hybrid model simulation represents its historical risk evolution process,which verifies the model rational*** risk control strategies reduced the mishap rate of a new demonstrator called BB-6 *** paper also shows the extended hybrid model can be applied on safety management of unmanned aerial vehicles from the initial period of vehicle development.

关键词： Blended-wing-body Demonstration flight test Markov analysis Risk assessment Strategy experiment System dynamics Systems theory

Evaluation of neural network models for landslide susceptibility assessment

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International Journal of Digital Earth 2022年第1期15卷 934-953页

作者： Yaning yi Wanchang Zhang Xiwei Xu Zhijie Zhang xuan Wu National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijingPeople’s Republic of China Key Laboratory of Crustal Dynamics China Earthquake AdministrationBeijingPeople’s Republic of China Xichang Observatory for Natural Disaster Dynamics of Strike-slip Fault System in the Tibetan Plateau XichangPeople’s Republic of China Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijingPeople’s Republic of China Department of Geography University of ConnecticutStorrsUSA University of Chinese Academy of Sciences BeijingPeople’s Republic of China

Identifying and assessing the disaster risk of landslide-prone regions is very critical for disaster prevention and *** to their special advantages,neural network algorithms have been widely used for landslide susceptibility mapping(LSM)in recent *** the present study,three advanced neural network models popularly used in relevant studies,*** neural network(ANN),one dimensional convolutional neural network(1D CNN)and recurrent neural network(RNN),were evaluated and compared for LSM practice over the Qingchuan County,Sichuan province,*** experimental results demonstrated satisfactory performances of these three neural network models in accurately predicting susceptible ***,ANN and 1D CNN models yielded quite consistent LSM results but slightly differed from those of RNN model ***,accuracy evaluations revealed that the RNN model outperformed the other two models both qualitatively and quantitatively but its complexity was relatively *** concerning training hyper-parameters on the performance of neural network models for LSM suggested that relatively small batch size values with Tanh activation function and SGD optimizer are essential to improve the performance of neural network models for LSM,which may provide a thread to help those who apply these advanced algorithms to improve their efficiency.

关键词： Deep learning landslide data-driven GIS Sichuan

Impact of Perturbation Schemes on the Ensemble Prediction in a Coupled Lorenz Model

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Advances in Atmospheric Sciences 2023年第3期40卷 501-513页

作者： Qian ZOU Quanjia ZHONG Jiangyu mao Ruiqiang DING Deyu LU Jianping LI xuan LI State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES)/Key Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies Ocean University of ChinaQingdao 266100China Laboratory for Ocean Dynamics and Climate Pilot Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China

Based on a simple coupled Lorenz model,we investigate how to assess a suitable initial perturbation scheme for ensemble forecasting in a multiscale system involving slow dynamics and fast *** initial perturbation approaches are used in the ensemble forecasting experiments:the random perturbation(RP),the bred vector(BV),the ensemble transform Kalman filter(ETKF),and the nonlinear local Lyapunov vector(NLLV)*** show that,regardless of the method used,the ensemble averages behave indistinguishably from the control forecasts during the first few time *** to different error growth in different time-scale systems,the ensemble averages perform better than the control forecast after very short lead times in a fast subsystem but after a relatively long period of time in a slow *** to the coupled dynamic processes,the addition of perturbations to fast variables or to slow variables can contribute to an improvement in the forecasting skill for fast variables and slow *** the initial perturbation approaches,the NLLVs show higher forecasting skill than the BVs or RPs *** NLLVs and ETKFs had nearly equivalent prediction skill,but NLLVs performed best by a narrow *** particular,when adding perturbations to slow variables,the independent perturbations(NLLVs and ETKFs)perform much better in ensemble *** results are simply implied in a real coupled air–sea *** the prediction of oceanic variables,using independent perturbations(NLLVs)and adding perturbations to oceanic variables are expected to result in better performance in the ensemble prediction.

关键词： ensemble prediction nonlinear local Lyapunov vector(NLLV) ensemble transform Kalman filter(ETKF) coupled air-sea models

A framework of force of information influence and application for C4KISR system

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Journal of Systems Engineering and Electronics 2024年第2期35卷 430-443页

作者： mao Shaojie DIAO Lianwang SUN Yu WANG Heng yi Kan XU Xin mao Xiaobin ZHANG Kecheng SHENG Long Science and Technology on Information Systems Engineering Laboratory The 28th Research Institute of China Electronics Technology Group CorporationNanjing 210007China Unit 94860 of the PLA Nanjing 210008China

The subversive nature of information war lies not only in the information itself, but also in the circulation and application of information. It has always been a challenge to quantitatively analyze the function and effect of information flow through command, control, communications, computer, kill, intelligence,surveillance, reconnaissance (C4KISR) system. In this work, we propose a framework of force of information influence and the methods for calculating the force of information influence between C4KISR nodes of sensing, intelligence processing,decision making and fire attack. Specifically, the basic concept of force of information influence between nodes in C4KISR system is formally proposed and its mathematical definition is provided. Then, based on the information entropy theory, the model of force of information influence between C4KISR system nodes is constructed. Finally, the simulation experiments have been performed under an air defense and attack scenario. The experimental results show that, with the proposed force of information influence framework, we can effectively evaluate the contribution of information circulation through different C4KISR system nodes to the corresponding tasks. Our framework of force of information influence can also serve as an effective tool for the design and dynamic reconfiguration of C4KISR system architecture.

关键词： information warfare command control communications computer kill intelligence surveillance reconnaissance(C4KISR)system information circulation force of information influence information entropy

Can Hybrid Synapse be Formed between Rat Spinal Motor Neurons and Major Pelvic Ganglion Neurons in vitro?

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Wuhan University Journal of Natural Sciences 2021年第6期26卷 521-526页

作者： CHENG Shigang XIANG xuan LV Zemin mao Xiaowen YANG Xinghai Department of Surgery Maternal and Child Health Hospital of Hubei ProvinceTongji Medical College of Huazhong University of Science and TechnologyWuhan 430070HubeiChina

The purpose of this study is to determine whether synapses can be formed between spinal motor neurons(SMNs)and major pelvic ganglion(MPG)neurons of a rat in *** green fluorescent protein(GFP)-labelled MPG cells were cultured together with SMNs in a specific *** synaptic-like contacts established between SMNs and MPG neurons were studied in co-cultures using morphologic and immunocytochemistry ***-contrast observation of co-cultures showed apparent SMNs-MPG neurons contacts as early as three or four days in *** demonstrate some evidence of synaptic contacts between SMNs and MPG neurons in vitro by immunostaining with antibody directed against postsynaptic density protein 95(PSD-95).We describe the development process of a defined SMNs-MPG neurons co-culture *** results suggest that the hybrid synapse formation that may occur between SMNs and MPG neurons in vitro played an essential role in the mechanisms of a regenerated bladder with an artificial somatic-autonomic reflex arc.

关键词： spinal motor neurons major pelvic ganglion co-culture synapse

Fast quantum state transfer and entanglement for cavity-coupled many qubits via dark pathways

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Frontiers of physics 2022年第4期17卷 91-98页

作者： yi-xuan Wu Zi-Yan Guan Sai Li Zheng-Yuan Xue Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials and School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong–Hong Kong Joint Laboratory of Quantum Matter and Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China

Quantum state transfer(QST)and entangled state generation(ESG)are important building blocks for modern quantum information *** achieve these tasks,convention wisdom is to consult the quantum adiabatic evolution,which is time-consuming,and thus is of low ***,using the shortcut to adiabaticity technique,we propose a general method to realize high-fidelity fast QST and ESG in a cavity-coupled many qubits system via its dark pathways,which can be further designed for high-fidelity quantum tasks with different optimization ***,with a proper dark pathway,QST and ESG between any two qubits can be achieved without decoupling the others,which simplifies experimental ***,ESG among all qubits can also be realized in a single *** addition,our scheme can be implemented in many quantum systems,and we illustrate its implementation on superconducting quantum ***,we propose a powerful strategy for selective quantum manipulation,which is promising in cavity coupled quantum systems and could find many convenient applications in quantum information processing.

关键词： entanglement generation quantum information processing cavity QED

Characterization and performance of graphene-PbSe thin film heterojunction

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Rare Metals 2021年第1期40卷 219-224页

作者： Bo He yi-xuan Ren Tian-Jun Dai Shuang Hou Xing-Zhao Liu School of Electronics Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Electronic Thin Films and Integrated Devices Chengdu 611731China

An infrared detector with high responsivity based on graphene-PbSe thin film heterojunction was ***-quality PbSe thin film and graphene were prepared by molecular beam epitaxy and chemical vapor deposition,*** physical characteristics of PbSe thin film and graphene were performed using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and Raman *** photo transistor using PbSe thin film as a sensitizer and graphene as a channel to transport excitons exhibits peak responsivity and detectivity up to~420 A·W^(-1) and 5.9×10^(11) Jones(radiation intensity:0.75 mW·cm^(-2))at room temperature in the near-infrared(NIR)region,*** high optical response is attributed to the photo-excited holes transferring from PbSe film to graphene under ***,it is revealed that the responsivity of graphene-PbSe photo transistor is gate-tunable which is important in photodetectors.

关键词： PbSe Graphene Heterojunction Infrared photodetectors

The effect of betaine surfactants on the association behavior of associating polymer

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Petroleum Science 2021年第5期18卷 1441-1449页

作者： Ji-Jiang Ge Tian-Ci Zhang yi-Ping Pan xuan Zhang College of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina

The interfacial properties and rheological behavior of surfactant/polymer complex systems were measured to investigate the association behavior of the associating *** with the pure surfactant solution,there are two inflection points in the surface tension curve for the surfactant/polymer complex *** two inflection points are dependent on the surfactant type and polymer *** effect of surfactant on the rheological behavior of polymer can be divided into two ***,the addition of short-chain betaine surfactant is detrimental to the viscosity of polymer solution due to the electrostatic shielding ***,long-chain betaine surfactant also reduces the viscosity of polymer solutions at low ***,when the concentration of the long-chain betaine surfactant is relatively high,the long-chain betaine surfactant could form worm-like micelles that promote the intermolecular association and thus increase the number of associating junctions,thereby resulting in the augmentation of *** it is necessary to apply the long-chain betaine surfactant to build the polymer/surfactant flooding *** interaction model between surfactant and polymer is proposed,which is different from the traditional‘Three-Region Model’.

关键词： Betaine surfactant Associating polymer Surface tension Viscosity Intermolecular association