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Journal of Advanced Dielectrics 2015年第3期5卷 54-58页

作者： Cheng Zhang Dan Xie Jianlong Xu Yilin Sun yongyuan zang Xiaowen Zhang Xingsen Gao Institute of Microelectronics Tsinghua National Laboratory for Information Science and Technology(TNList)Tsinghua University Beijing 100084P.R.China Electrical and Computer Engineering McGill University MontrealQuebec H3A 2T8Canada Virgiltech MontrealQuebec H4B 0A1Canada Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials South China Normal University Guangzhou 510006P.R.China

Multiferroic BiFeO_(3)(BFO)and Y,Zr codoped BFO(Bi_(1-x)Y_(x)Fe_(0.95)Zr_(0.05)O_(3)ceramics were prepared and the influence of codoping on the crystal structure and magnetic properties were investigated in this *** by the evolution of X-ray diffraction and Raman modes,the codoping has changed the crystal structure from rhombohedral to tetragonal in bulk BFO *** enhancement of magnetic behaviors is demonstrated by the damage of space-modulated spiral spin structure,and it can be attributed to the crystal structure change and size ***,Raman spectra from 300 to 800K demonstrates that lower frequency phonon modes show rapid softening near the Neel temperature.

关键词： BiFeO_(3) ceramics codoping magnetization temperature

Inducing effect of Pb(Zr0.4Ti0.6)O3 thin film derived by different processes in BiFeO3/Pb(Zr0.4Ti0.6)O3 multilayer capacitor at room temperature

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中国科学:技术科学 2010年第4期 427-427页

作者： XIE Dan 1,zang yongyuan 1,LUO YaFeng 1,REN TianLing 1,LIU LiTian 1 & DANG ZhiMin 2 1Institute of Microelectronics,Tsinghua University,Beijing 100084,China 2College of Material Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China

BiFeO3/PZT multilayer capacitor was prepared on Pt(100) /Ti/SiO2/Si(100) *** buffer layer was derived by MOCVD method(label:PZT1) and sputtering method(label:PZT2) *** analysis indicated that high(110) orientation of BFO in the BFO/PZT1 structure was *** analysis indicated a better microstructure in the BFO/PZT1 structure compared with BFO/*** remnant polarization of the BFO/PZT1 was 82.5μC/cm2 at an applied voltage of 8 V,compared with that of 25.2μC/cm2 in the BFO/PZT 2 *** BFO/PZT1 multilayer exhibited little polarization fatigue(<1.5%) upon 1×101 0switching cycles,at an applied voltage of 4 *** leakage current density was about 2×10-7A/cm 2 at an applied voltage 4 V,in the BFO/PZT1 *** the results indicated that PZT can act as an inducing layer to the BFO and the MOCVD derived PZT has more inducing effect to the BFO thin film at room temperature.

关键词： BFO PZT MOCVD properties FeRAM

High-resolution Solar Image Reconstruction Based on Non-rigid Alignment

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Research in Astronomy and Astrophysics 2022年第9期22卷 63-71页

作者： Hui Liu Zhenyu Jin yongyuan Xiang Kaifan Ji Yunnan Observatories Chinese Academy of SciencesKunming 650216China

Suppressing the interference of atmospheric turbulence and obtaining observation data with a high spatial resolution are an issue to be solved urgently for ground observations. One way to solve this problem is to perform a statistical reconstruction of short-exposure speckle images. Combining the rapidity of Shift-Add and the accuracy of speckle masking, this paper proposes a novel reconstruction algorithm-NASIR(Non-rigid Alignment based Solar Image Reconstruction). NASIR reconstructs the phase of the object image at each frequency by building a computational model between geometric distortion and intensity distribution and reconstructs the modulus of the object image on the aligned speckle images by speckle interferometry. We analyzed the performance of NASIR by using the correlation coefficient, power spectrum, and coefficient of variation of intensity profile in processing data obtained by the NVST(1 m New Vacuum Solar Telescope). The reconstruction experiments and analysis results show that the quality of images reconstructed by NASIR is close to speckle masking when the seeing is good, while NASIR has excellent robustness when the seeing condition becomes worse. Furthermore, NASIR reconstructs the entire field of view in parallel in one go, without phase recursion and block-by-block reconstruction, so its computation time is less than half that of speckle masking. Therefore, we consider NASIR is a robust and highquality fast reconstruction method that can serve as an effective tool for data filtering and quick look.

关键词： methods:data analysis techniques:image processing Sun:chromosphere Sun:photosphere instrumentation:high angular resolution

GROWTH AND TWO-WAVE COUPLING PROPERTIES OF POTASSIUM SODIUM STRONTIUM BARIUM NIOBATE WITH A-SITES NOT FULLY-OCCUPIED

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Chinese Physics Letters 1990年第6期7卷 272-275页

作者： JIANG Quanzhong CHEN Huanchu SONG yongyuan SUN Daliang Institute of Crystal Materials Shandong UniversityJinan 250100

This paper reports the growth and two-wave coupling properties of(K_(0.5)-Na_(0.5))2z(Sr_(0.75)Ba_(0.25))_(1-z)Nb_(2)O_(6)(z=0.1,0.05 and 0.03)*** to the others,the crystal at z=0.05 has shorter response time and larg... 详细信息

关键词： coefficient coupling shorter

Spatiotemporal evolution of urban carbon emission performance in China and prediction of future trends

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Journal of Geographical Sciences 2020年第5期30卷 757-774页

作者： WANG Shaojian GAO Shuang HUANG yongyuan SHI Chenyi Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation School of Geography and PlanningSun Yat-sen UniversityGuangzhou 510275China College of Urban and Environmental Sciences Peking UniversityBeijing 100871China

Climate change resulting from CO_2 emissions has become an important global environmental issue in recent *** carbon emission performance is one way to reduce carbon *** carbon emission performance has been discussed at the national and industrial levels,city-level studies are lacking due to the limited availability of statistics on energy *** this study,based on city-level remote sensing data on carbon emissions in China from 1992–2013,we used the slacks-based measure of super-efficiency to evaluate urban carbon emission *** traditional Markov probability transfer matrix and spatial Markov probability transfer matrix were constructed to explore the spatiotemporal evolution of urban carbon emission performance in China for the first time and predict long-term trends in carbon emission *** results show that urban carbon emission performance in China steadily increased during the study period with some ***,the overall level of carbon emission performance remains low,indicating great potential for improvements in energy conservation and emission *** spatial pattern of urban carbon emission performance in China can be described as"high in the south and low in the north,"and significant differences in carbon emission performance were found between *** spatial Markov probabilistic transfer matrix results indicate that the transfer of carbon emission performance in Chinese cities is stable,resulting in a"club convergence"***,neighborhood backgrounds play an important role in the transfer between carbon emission performance *** on the prediction of long-term trends in carbon emission performance,carbon emission performance is expected to improve gradually over ***,China should continue to strengthen research and development aimed at improving urban carbon emission performance and achieving the national energy conservation and emission reducti

关键词： urban carbon emission performance super-efficiency SBM model spatial Markov chain spatiotemporal patterns trend prediction China

Further results on dynamic-algebraic Boolean control networks

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Science China(Information Sciences) 2019年第1期62卷 177-190页

作者： Sen WANG Jun-E FENG yongyuan YU Jianli ZHAO School of Mathematics Shandong University School of Mathematical Science Liaocheng University

Restricted coordinate transformation, controllability, observability and topological structures of dynamic-algebraic Boolean control networks are investigated under an assumption. Specifically, given the input-state at some point, assume that the subsequent state is certain or does not exist. First, the system can be expressed in a new form after numbering the elements in admissible set. Then, restricted coordinate transformation is raised, which allows the dimension of new coordinate frame to be different from that of the original one. The system after restricted coordinate transformation is derived in the proposed ***, three types of incidence matrices are constructed and the results of controllability, observability and topological structures are obtained. Finally, two practical examples are shown to demonstrate the theory in this paper.

关键词： controllability dynamic-algebraic Boolean control network fixed point and cycle observability restricted coordinate transformation

Time-asynchrony identification between inertial sensors in SIMU

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Journal of Systems Engineering and Electronics 2015年第2期26卷 346-352页

作者： Gongmin Yan Xi Sun Jun Weng Qi Zhou yongyuan Qin School of Automation Northwestern Polytechnical University Xi'an Flight Automatic Control Research Institute

Traditional strapdown inertial navigation system （SINS） algorithm studies are based on ideal measurements from gy- ros and accelerometers, while in the actual strapdown inertial measurement unit （SIMU）, time-asynchrony between each iner- tial sensor is inevitable. Testing principles and methods for time- asynchrony parameter identification are studied. Under the single- axis swaying environment, the relationships between the SINS platform drift rate and the gyro time-asynchrony are derived using the SINS attitude error equation. It is found that the gyro time- asynchrony error can be considered as a kind of pseudo-coning motion error caused by data processing. After gyro testing and synchronization, the single-axis tumble test method is introduced for the testing of each accelerometer time-asynchrony with respect to the ideal gyro triad. Accelerometer time-asynchrony parame- ter identification models are established using SINS specific force equation. Finally, all of the relative time-asynchrony parameters between inertial sensors are well identified by using fiber optic gyro SIMU as experimental verification.

关键词： strapdown inertial navigation system(SINS) time-asynchrony pseudo-coning error velocity error

Data set approach for solving logical equations

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Science China(Information Sciences) 2020年第6期63卷 235-237页

作者： Sen WANG Jun-E FENG yongyuan YU Xinhong WANG School of Mathematics Shandong University School of Information Science and Engineering University of Jinan

Dear editor,Since Kauffman built a Boolean network model to simulate the interaction of genes in 1969 [1],Boolean networks have been used to describe relationships of cells, proteins, DNA and RNA in biological systems [2–5]. In virtue of semi-tensor product (STP), an algebraic framework was developed to analyze Boolean networks [6, 7].Logical equations arise when some variables are

关键词： Data set approach for solving logical equations

Fault detectability of Boolean control networks via nonaugmented methods

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Science China(Information Sciences) 2023年第12期66卷 94-106页

作者： Rong ZHAO Caixia WANG yongyuan YU Jun-E FENG School of Mathematics Shandong University

This study is concerned with the fault detectability of Boolean control networks(BCNs) by two nonaugmented methods. Firstly, the equivalent system-based approach is considered, and the equivalence of BCNs is applied to analyze weak active fault detectability. Further, an iterative matrix set-based approach is proposed, by which, several novel criteria for strong and weak active fault detectability are ***, effective algorithms are designed to check strong and weak active fault detectability and generate all feasible input sequences with the minimum length. In comparison, our results reduce the computational complexity dramatically than the existing studies.

关键词： Boolean control network fault detectability equivalent system nonaugmented method semi-tensor product

Testing a participatory integrated assessment(PIA) approach to select climate change adaptation actions to enhance wetland sustainability: The case of Poyang Lake region in China

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Advances in Climate Change Research 2015年第2期6卷 141-150页

作者： HUANG Li YIN yongyuan DU De-Bin School of Urban and Regional Science East China Normal University

The necessity of mainstreaming climate adaptation strategies or policies into natural resource management plans has been recognized by the *** IPCC AR5 report suggests a growing demand for research to provide information for a deeper and more useful understanding of climate adaptation options,and indicates a lack of effective methods to meet this increasing demand of *** this respect,a participatory integrated assessment(PIA) approach is presented in this paper to provide an effective means to mainstream wetland climate change adaptation in rural sustainable development strategies,and thus to reduce climate vulnerability and to enhance rural community *** PIA approach includes a series of research activities required to assess climate impacts on wetland ecosystems,and to prioritize adaptation responses.A range of adaptation options that address key aspects of the wetland ecosystem resilience and concerns are evaluated against community based on sustainable development *** PIA approach is able to identify desirable adaptation options which can then be implemented to improve wetland ecosystem health and to enhance regional sustainable development in a changing *** illustration purpose,the PIA was applied in a case study in Poyang Lake(PYL) region,a critical wetland and water ecosystem in central China with important international biodiversity linkages,and a locale for key policy experiments with ecosystem *** PIA was used to facilitate the integration of wetland climate change adaptation in rural sustainable development actions with multi-stakeholders *** particular,the case shows how the PIA can be designed and implemented to select effective and practical climate change adaptation options to enhance ecosystem services management and to reduce resource use conflicts and rural *** in partnership with multi-stakeholders and assisted with a multi-criteria decision making tool,the cas

关键词： Climate adaptation Wetland ecosystem Participatory