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Complex dynamic behaviors in hyperbolic-type memristor-based cellular neural network

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Chinese Physics B 2022年第2期31卷 255-268页

作者： ai-Xue qi Bin-Da Zhu Guang-Yi Wang Faculty of Aerospace Engineering Binzhou UniversityBinzhou 256603China Institute of Modern Circuits and Intelligent Information Hangzhou Dianzi UniversityHangzhou 310018China

This paper presents a new hyperbolic-type memristor model,whose frequency-dependent pinched hysteresis loops and equivalent circuit are tested by numerical simulations and analog integrated operational amplifier *** on the hyperbolic-type memristor model,we design a cellular neural network(CNN)with 3-neurons,whose characteristics are analyzed by bifurcations,basins of attraction,complexity analysis,and circuit *** find that the memristive CNN can exhibit some complex dynamic behaviors,including multi-equilibrium points,state-dependent bifurcations,various coexisting chaotic and periodic attractors,and offset of the positions of *** calculating the complexity of the memristor-based CNN system through the spectral entropy(SE)analysis,it can be seen that the complexity curve is consistent with the Lyapunov exponent spectrum,i.e.,when the system is in the chaotic state,its SE complexity is higher,while when the system is in the periodic state,its SE complexity is ***,the realizability and chaotic characteristics of the memristive CNN system are verified by an analog circuit simulation experiment.

关键词： memristor cellular neural network chaos

Gold-Nanoparticles/Boron-Doped-Diamond Composites as Surface-Enhanced Raman Scattering Substrates

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Chinese Physics Letters 2020年第6期37卷 107-110页

作者： ai-qi Zhang qi-Liang Wang Ying Gao Shao-Heng Cheng Hong-Dong Li State Key Lab of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

By vacuum sputtering and annealing processes of gold(Au)films on boron-doped diamond(BDD)surfaces,Aunanoparticles/BDD(AuNP/BDD)composite substrates were prepared as surface-enhanced Raman scattering(SERS)*** SERS performances of the substrate were investigated using methylene blue molecule as a *** the AuNPs having an average diameter of 20 nm,high performance of SERS was achieved at an enhancement factor of 9×10~5,arising from the synergistic effect of electromagnetic enhancement from Au NPs and chemical enhancement from *** AuNP/BDD substrate is demonstrated to be highly sensitive,reproducible,stable,and reusable for the SERS *** to the facile preparation process and controllable surface morphology,the AuNP/BDD substrates are favorable as a high performance SERS platform performed in practical applications.

关键词： boron synergistic annealing

Static and Dynamic Analysis of Lasing Action from Single and Coupled Photonic Crystal Nanocavity Lasers

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Chinese Physics Letters 2017年第2期34卷 30-33页

作者： Peng-Chao Zhao Fan qi ai-Yi qi Yu-Fei Wang Wan-Hua Zheng State key Laboratory on Integrated Optoeleetronics Institute of Semiconductors Beijing 100083 Laboratory of Solid-state Optoelectronics Information Technology Institute of Semiconductors Beijing 100083

The single and coupled photonic crystal nanocavity lasers are fabricated in the InGaAsP material system and their static and dynamic features are compared. The coupled-cavity lasers show a larger lasing e^ciency and generate an output power higher than the single-cavity lasers, results that are consistent with the theoretical results obtained by rate equations. In dynamic regime, the single-cavity lasers produce pulses as short as 113 ps, while the coupled-cavity lasers show a significantly longer lasing duration. These results indicate that the photonic crystal laser is a promising candidate for the light source in high-speed photonic integrated circuit.

关键词： Static and Dynamic Analysis of Lasing Action from Single and Coupled Photonic Crystal Nanocavity Lasers

Defining region-specific heatwave in China based on a novel concept of “avoidable mortality for each temperature unit decrease”

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Advances in Climate Change Research 2021年第5期12卷 611-618页

作者： LIU Jiang-Mei ai Si-qi qi Jin-Lei WANG Li-Jun ZHOU Mai-Geng WANG Chong-Jian YIN Peng LIN Hua-Liang National Center for Chronic and Noncommunicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing100050China Department of Epidemiology School of Public HealthSun Yat-sen UniversityGuangzhou510080China Department of Epidemiology School of Public HealthZhengzhou UniversityZhengzhou450000China

The distribution of temperature and temperature-health association varied largely across different regions in China,a region-specific definition for heatwave was therefore *** collected the data on daily mortality,meteorological factors and air pollution in 84 Chinese cities during 2013–2016,which was divided into seven *** on the association between daily maximum temperature and mortality in each city in a threshold distributed lag non-linear model,where the threshold was defined as the temperature corresponding to the lowest mortality risk,we calculated the number of deaths that could be avoided for 1℃ decrease in maximum temperature under different thresholds,then a random-effect meta-analysis was used to generate regional results,in which the temperature with the highest avoidable mortality number for 1℃ decrease was considered as the most appropriate heatwave *** observed an immediate detrimental effect of high temperature within three lag *** analysis suggested to use 29.5℃,31.5℃,29.0℃,31.5℃,30.0℃,and 28.5℃ as the heatwave standard for east,north,northeast,central,south,and southwest region,with the avoidable mortality number of 1.54(95%Confidence interval(CI):0.88,2.19),0.55(95%CI:0.16,0.94),0.59(95%CI:0.32,0.86),1.14(95%CI:0.68,1.59),1.22(95%CI:0.54,1.90),and 0.78(95%CI:0.01,1.55),respectively,while the estimated number 0.19(95%CI:−0.02,0.40)in northwest region was not statistically *** concept of‘avoidable mortality for 1℃ decrease’was proposed to define the heatwave event,and varied maximum temperature between 28.5 and 31.5℃ was suggested for region-specific heatwave definition in China.

关键词： Heatwave Mortality burden Distributed lag non-linear model

China’s foreign direct investment in BRICS countries:status,problems and prospects

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China Finance and Economic Review 2014年第1期3卷 70-82页

作者： Sang Bai-chuan Zheng Wei Tan Hui ai qi University of International Business and Economics BeijingChina University of London LondonUnited Kingdom

The emerging economies,represented by the BRICS,have risen rapidly in post-crisis era in both economic development and national *** order to ensure a stable and sustainable long-term development of national economy,the governments of BRICS countries have shown positive attitude to foreign direct *** is a great opportunity for China to increase its direct investment in these countries,which will not only provide strong support to China’s“going global”strategy,but also help avoid risks arising from intensive investment in its traditional investment *** article focuses on the status of Chinese outward direct investment in the BRICS countries by analyzing existing problems in investment process and providing forecast as well as future agenda on China’s direct investment in these countries.

关键词： China BRICS countries outward foreign direct investment

Thermal behaviors of deactivation catalysts for synthesizing 2, 3, 5-trimethylhydroquinone

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Journal of Central South University of Technology 2005年第z1期12卷 65-67页

作者： qiAN Dong SHI ai-hua CHEN qi-yuan LIU Zhi-jian School of Chemistry and Chemical Engineering Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Sinopec Changling Catalyst Division Yueyang 414012 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China School of Chemistry and Chemical Engineering Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

The thermal behaviors of the deposits on supported noble metal catalysts for synthesizing 2, 3, 5-trimethylhydroquinone by DSC were studied. The results show that the supported Pd catalysts have two exothermic peaks at around 312 ℃ and 435 ℃ in the DSC thermograms, respectively, while the supported Pt catalysts have one exothermic peak at approximately 345 ℃. Therefore, it is supposed that the adsorptive states of deposits on supported Pt catalysts and supported Pd catalysts are different, which may be one reason leading to the stability difference between supported Pt catalysts and supported Pd catalysts.

关键词： deposit supported Pd catalysts supported Pt catalysts DSC

A dual-switching spin-crossover framework with redox regulation and guest response

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Science China Chemistry 2023年第6期66卷 1744-1749页

作者： Long-Fei Wang Si-Guo Wu Ze-Yu Ruan ai-qi Jian Wen Cui Zhao-Ping Ni Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China CNRS Centre de Recherche Paul PascalPessac F-33600France

A dual-switching spin crossover metal-organic framework(SCO-MOF)[Fe(TPB){Pt^(Ⅱ)(CN)_(4)}]·3iPrOH·4H_(2)O(TPB=1,2,4,5-tetra(pyridin-4-yl)benzene)is developed via the combination of redox-active framework and tunable *** reversible structural transformation between[Pt^(Ⅱ)(CN)_(4)]^(2-) and[Pt^(Ⅳ)Br_(2)(CN)_(4)]^(2-)moieties can be manipulated by redox post-synthetic modification(PSM),which results in the change of SCO behaviors from step-wise to *** influences of the oxidative addition of bromides on the ligand field splitting of Fe side are further explored by density functional theory ***,the modulation of hysteretic four-/three-step,one-step and four-step SCO behaviors can be achieved by tuning the composition of guest ***,the combination of electronic bistability,redox reaction and guest recognition in a homogeneous lattice provides a utility platform for designing multi-responsive molecule-based materials.

关键词： spin crossover iron(Ⅱ) post-synthetic modification redox host-guest interaction

Mapping of QTL conferring leaf rust resistance in Chinese wheat lines W014204 and Fuyu 3 at adult plant stage

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Journal of Integrative Agriculture 2016年第1期15卷 18-28页

作者： qi ai-yong ZHANG Pei-pei ZHOU Yue YAO Zhan-jun LI Zai-feng LIU Da-qun Department of Plant Pathology College of Plant Protection Agricultural University of Hebei Department of Biochemistry Baoding University College of Agronomy Agricultural University of Hebei

Wheat leaf rust is a destructive foliar disease of common wheat （Triticum aestivum L.） worldwide. The most effective, economical s to control the disease is growing resistant cultivars with adult plant resistance （APR）. The Chinese wheat tines W014204 and Fuyu 3 showed high leaf rust resistance in the field. To identify leaf rust APR genes in the two lines, two mapping populations with 215 and 163 F2：3 lines from the crosses W014204/Zhengzhou 5389 and Fuyu 3/Zhengzhou 5389, respectively, were phenotyped for leaf rust severities during the 2010-2011, 2011-2012 and 2012-2013 cropping seasons in the field at Baoding, Hebei Province, China. A total of 1 215 SSR markers were used to identify the quantitative trait loci （QTLs） for leaf rust APR in the two populations. In the W014204/Zhengzhou 5389 population, three QTLs were detected and designated as ***-lBL.1, ***-2BS.1 and ***-7DS, and explained 2.9-8.4, 11.5-38.3 and 8.5-44.5% of the phenotypic variance, respectively; all the resistance alleles at these loci were derived from W014204. In the Fuyu 3/Zhengzhou 5389 population, three QTLs, ***-lBL.2, ***-2BS.2 and ***-7BL, explained 12.0-19.2, 22.3-38.9 and 4.1-4.3% of the phenotypic variance, respectively, and all resistance alleles were contributed by Fuyu 3. Based on chromosome positions of closely linked markers, both ***-lBL. 1 and ***-lBL.2 are Lr46, and ***-7DS is Lr34. ***-7BL was mapped on chromosome 7BL near to Lr68 and they are likely the same gene. Based on chromosome positions, pedigree and field reactions, the two 2BS QTLs are different from all the known APR genes and are likely to be newAPR QTL for leaf rust. These QTLs and their closely linked markers are potentially useful for improving leaf rust resistance in wheat breeding.

关键词： Triticum aestivum Puccinia triticina APR SSR marker

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CPU空气强迫对流冷却系统设计

电子学报 2007年第8期35卷 1592-1597页

作者：周建辉杨春信 ai qi 鲁俊勇北京航空航天大学航空科学与工程学院北京100083 奇宏电子（深圳）有限公司广东深圳518104

根据空气强迫对流冷却系统一体化设计理念,对9238CPU风扇进行空气动力设计,由Fortran程序输出三维空间曲线文件,导入Pro/E实现实体造型.通过标准风洞对CNC铣床雕刻出的样品进行风扇性能测试.根据风扇数值模拟结果(风扇出口流场特性)设... 详细信息

根据空气强迫对流冷却系统一体化设计理念,对9238CPU风扇进行空气动力设计,由Fortran程序输出三维空间曲线文件,导入Pro/E实现实体造型.通过标准风洞对CNC铣床雕刻出的样品进行风扇性能测试.根据风扇数值模拟结果(风扇出口流场特性)设计系列放射状散热器.采用分块六面体网格技术,应用多参考旋转坐标系模型和RNGk-ε模型对风扇和曲线型散热器进行整体数值模拟,模拟结果表明曲线型散热器相对传统垂直型散热器热阻值降低15.9%,最后通过实验证明数值模拟的可信性.一体化设计思想指导下的系列散热器能达到高性能散热效果.

关键词：计算流体力学熵产最小化原理一体化设计风扇曲线型散热器