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新时代城乡融合发展:“三生融合”演进及其驱动因素

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国土资源科技管理 2024年第4期41卷 18-34页

作者：王丽英何嘉南吴倩成都理工大学管理科学学院四川成都610059 成都理工大学数理学院四川成都610059

生产融合—生活融合—生态融合(简称“三生融合”)是新时代大力推进城乡深度融合和实现城乡共同富裕的必由之路。运用改进CRITIC法、改进耦合协调度模型、剪刀差模型、莫兰指数和地理探测器模型,深入探究2012—2021年我国城乡“三生融... 详细信息

生产融合—生活融合—生态融合(简称“三生融合”)是新时代大力推进城乡深度融合和实现城乡共同富裕的必由之路。运用改进CRITIC法、改进耦合协调度模型、剪刀差模型、莫兰指数和地理探测器模型,深入探究2012—2021年我国城乡“三生融合”的演进特征及驱动因素。结果表明:(1)城乡“三生融合”总体水平和子系统水平均出现不同程度上升,但生态融合与生产融合、生活融合演化速率剪刀差不断拉大,三者极差呈现“V”型变化;(2)生态融合是制约“三生融合”系统耦合的主要因素;(3)城乡“三生融合”耦合协调度在观察期内上升速率放缓,整体陷入发展困境,而且区域异质性明显,高值区域由东中部地区向西部地区和东北地区扩展;(4)政府干预程度等显著影响城乡“三生融合”耦合协调度,各个因素对子系统存在不同的影响;(5)子系统水平和耦合协调度水平问题区域分析表明,我国城乡融合发展主要问题区域集中在西部地区和东北地区。

关键词：城乡融合发展 “三生融合” 耦合协调度驱动因素问题区域识别

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The change in thickness of the solidified liquid layer rather than the immobilized mass determines the frequency response of a quartz crystal microbalance

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Science China Chemistry 2012年第1期55卷 175-181页

作者： he jianan LU YuDong FANG Jing MA HongWei Department of Biomedical Engineering College of EngineeringPeking UniversityBeijing 100871China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China Biomed-X Research Center Academy of Advanced Interdisciplinary StudiesPeking UniversityBeijing 100871China

The "solidified liquid layer" model has been examined using a quartz crystal microbalance(QCM) with a polymeric *** model is shown to give a reasonable explanation for the following experimental observations:(i) The opposite response of the QCM and surface plasmon resonance(SPR) for the activation process;(ii) the marked difference in the responses for IgG/anti-IgG interaction between QCM and *** analysis and experimental results indicated that QCM is sensitive to the thickness change of the "solidified liquid layer" but not the mass of captured biomolecules(i.e.,the immobilized mass),implying caution must be taken in interpreting QCM results.

关键词： quartz crystal microbalance solidified liquid layer matrix biosensor

Quartz crystal microbalance study of the kinetics of surface initiated polymerization

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Science China Chemistry 2009年第12期52卷 2307-2322,1-5页

作者： CheN XinAn ZHANG YaoZhong he jianan XIONG ChunYang MENG YongHong JIN Gang MA HongWei Department of Biomedical Engineering College of EngineeringPeking UniversityBeijing 100871China National Microgravity Laboratory Institute of MechanicsChinese Academy of SciencesBeijing 100190China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215125China

Surface initiated polymerization (SIP) is a valuable tool in synthesizing functional polymer brushes,yet the kinetic understanding of SIP lags behind the development of its application. We apply quartz crystal microbalance (QCM) to address two issues that are not fully addressed yet play a central role in the rational design of functional polymer brushes,namely quantitative determination of the kinetics and the initiator efficiency (IE) of SIP. SIP are monitored online using QCM. Two quantitative frequencythickness (f-T) relations make the direct determination and comparison of the rate of polymerization possible even for different monomers. Based on the bi-termination model,the kinetics of SIP is simply described by two variables,which are related to two polymerization constants,namely a = 1/(kp,s,app-[M][R·]0) and b = kt,s,app/(kp,s,app[M]). Factors that could alter the kinetics of SIP are studied,including (i) the molecular weight of monomers,(ii) the solvent used,(iii) the initial density of the initiator,(iv) the concentration of monomer,[M],and (v) the catalyst system (ratio among the ingredients,metal,ligands,and additives). The dynamic nature of IE is also described by these two variables,IE = a/(a + bt). Instead of the molecular weight and the polydispersity,we suggest that film thickness,the two kinetic parameters (a and b),and the initial density of the initiator and IE be the parameters that characterize ultrathin polymer brushes. Besides the kinetics study of SIP,the reported method has many other applications,for example,in the fast screening of catalyst system for SIP and other polymerization systems.

关键词： surface initiated polymerization quartz crystal microbalance kinetics controlled living radical polymerization

基于两样本孟德尔随机化研究血脂水平和子宫内膜异位症之间的关系

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成都医学院学报 2024年第3期19卷 424-427页

作者：李永红何家楠许俊晖张圆青郑群何跃东四川大学华西第二医院妇产科 610041 成都市温江区人民医院妇产科 611130 成都医学院临床医学院 610500

目的采用两样本孟德尔随机化研究,探索血脂水平和子宫内膜异位症之间的因果关系。方法利用大样本全基因组关联研究(GWAS)汇总数据,选择与各类血脂水平密切相关的遗传位点为工具变量,采用逆方差加权法进行两样本孟德尔随机化分析,以OR... 详细信息

目的采用两样本孟德尔随机化研究,探索血脂水平和子宫内膜异位症之间的因果关系。方法利用大样本全基因组关联研究(GWAS)汇总数据,选择与各类血脂水平密切相关的遗传位点为工具变量,采用逆方差加权法进行两样本孟德尔随机化分析,以OR值评价各类血脂水平与子宫内膜异位症间的因果关系。结果除了极小极低密度脂蛋白(VLDL)胆固醇外,其余与VLDL有关的血脂水平升高会增加子宫内膜异位症的发病风险(OR>1)。高密度脂蛋白(HDL)中与胆固醇有关的血脂类型、小低密度脂蛋白(LDL)中总胆固醇水平升高可减少子宫内膜异位症的发病风险(OR1)。结论多种类型的血脂水平会影响子宫内膜异位症的发生,HDL中与胆固醇或甘油三酯相关的血脂水平可作筛查子宫内膜异位症的生物指标。

关键词：孟德尔随机化研究子宫内膜异位症血脂水平因果关系

风-储孤岛微电网的虚拟同步电机模型预测频率波动抑制

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宁夏电力 2024年第1期 1-10页

作者：罗美玲韩忠修黄伟兵赫嘉楠寿邵安国网宁夏电力有限公司宁夏银川750001 国电南瑞南京控制系统有限公司江苏南京211100 国网宁夏电力有限公司电力科学研究院宁夏银川750011

随着我国风力发电系统装机容量的增加,其在电网中的比重也越来越高,高渗透率带来了并网系统频率稳定性问题,对此提出一种虚拟同步电机的多目标预测控制策略。虚拟同步电机控制在频率波动时往往通过设置虚拟旋转方程提供频率支撑,难以达... 详细信息

随着我国风力发电系统装机容量的增加,其在电网中的比重也越来越高,高渗透率带来了并网系统频率稳定性问题,对此提出一种虚拟同步电机的多目标预测控制策略。虚拟同步电机控制在频率波动时往往通过设置虚拟旋转方程提供频率支撑,难以达到很好的频率波动抑制效果。为进一步减小频率波动对电网稳定性威胁,考虑到模型预测控制的诸多优点,提出一种基于模型预测控制思想的连续控制集多目标优化方法。该方法利用虚拟同步电机旋转方程建立功率预测模型,可在频率波动情况下预测功率变化。通过设计成本函数和考虑输出约束条件,求解得到最优功率增量,将其用于修改功率指令,使储能电池组在公共接入点处提供更多有功功率,减小系统频率变化。半实物仿真实验证明,该方法可有效降低系统频率波动,提高风-储孤岛微电网系统频率稳定性。

关键词：风力发电系统虚拟同步电机模型预测控制

基于最小二乘法的变电站故障录波测距系统设计

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自动化仪表 2024年第7期45卷 89-93页

作者：赫嘉楠栗磊牛健郭东霞刘海涛钟旭国网宁夏电力有限公司电力科学研究院宁夏银川750001 北京四方继保工程技术有限公司北京100085

当前,变电站故障区域受录波器性能的影响,阻抗值获取难度较大,导致故障区域测距效率较低。为提高变电站故障区域的测距效率、确保变电站的供电稳定,设计了基于最小二乘法的变电站故障录波测距系统。在系统硬件部分,采用分布式的电力故... 详细信息

当前,变电站故障区域受录波器性能的影响,阻抗值获取难度较大,导致故障区域测距效率较低。为提高变电站故障区域的测距效率、确保变电站的供电稳定,设计了基于最小二乘法的变电站故障录波测距系统。在系统硬件部分,采用分布式的电力故障录波器装置,收集变电站电力数据,利用以太网后台机完成数据传输。在系统软件部分,凭借最小二乘法计算模拟量通道的变比参数,校正电力录波装置通道间的相位误差,以提高录波器模拟量的测量精度。通过故障相电流差与相电压差获得阻抗值结果,计算出变电站故障录波的准确距离。试验结果表明:所设计系统的步角误差与测距误差均较小,故障录波测距误差降到了1%以内。该系统可以有效完成变电站故障点的精准定位,具有较高的参考价值。

关键词：变电站故障最小二乘法故障录波测距录波装置通道故障选相分散式录波装置

Grasp the New Normal and Guide the New Silk Road

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China International Business 2015年第4期 48-51页

作者： WANG jianan he ZHANHUA

Situated in the geographical geometry center of China, Shaanxi has played an important role in gathering and radiating regional economy with its regional advantage as the center of the mainland since ancient times. Especially in the history of Silk Road, as then political and economic center of China, Shaanxi brought in commodities from various countries. Meanwhile, China＇s silk, porcelain, tea and other products which attracted countries along the Silk Road most were shipped from here to various countries along the Silk Road, which has laid the foundation of Shaanxi as the trade and logistics center of Silk Road.

关键词：丝绸之路标准引导几何中心区域优势区域经济经济中心物流中心

Recurrent Neural Network Inspired Finite-Time Control Design

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1527-1529页

作者： jianan Liu Shihua Li Rongjie Liu School of Automation Southeast UniversityNanjing 210096China Department of Statistics Florida State UniversityFL 32304 USA IEEE

Dear Editor,This letter is concerned with the role of recurrent neural networks(RNNs)on the controller design for a class of nonlinear *** by the architectures of RNNs,the system states are stacked according to the dynamic along with time while the controller is represented as the neural network *** build the bridge between RNNs and finite-time controller,a novel activation function is imposed on RNNs to drive the convergence of states at finite-time and propel the overall control process *** stability proof is briefly provided for the convergence of the proposed finite-time *** last,a numerical simulation example is presented to illustrate the efficiency of the proposed *** networks can be classified as static(feedforward)and dynamic(recurrent)nets[1].The former nets do not perform well in dealing with training data and using any information of the local data structure[2].In contrast to the feedforward neural networks,RNNs are constituted by high dimensional hidden states with dynamics.

关键词： dynamics finite proof

电磁脉冲应力下MOSFET器件退化机制研究

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集成电路与嵌入式系统 2024年第5期24卷 55-59页

作者：宋斌斌王凯鹿祥宾单书珊罗宗兰栗磊赫嘉楠北京芯可鉴科技有限公司北京102200 国网宁夏电力有限公司电力科学研究院银川750011

针对电力应用场景中电磁脉冲导致芯片性能异常退化、芯片内MOSFET(Metal Oxide Semiconductor Field Effect Transistor)等器件失效机理不清晰等问题,本研究采用幅值和宽度分别为8 V和100 ns的TLP(Transmission Line Pulse)脉冲施加至5 ... 详细信息

针对电力应用场景中电磁脉冲导致芯片性能异常退化、芯片内MOSFET(Metal Oxide Semiconductor Field Effect Transistor)等器件失效机理不清晰等问题,本研究采用幅值和宽度分别为8 V和100 ns的TLP(Transmission Line Pulse)脉冲施加至5 V NMOS器件栅氧层,测量了不同脉冲循环次数下器件输出特性曲线I d V d和转移特性曲线I d V g,通过分析不同TLP脉冲条件下跨导的变化规律研究了阈值电压和载流子迁移率随TLP脉冲个数的退化规律。研究结果表明,相同漏电压V d和栅极电压V g下,器件漏电流I d随TLP脉冲次数的增加而升高;TLP脉冲导致阈值电压V T降低显著,施加20000次TLP脉冲后V T降低约25.66%;TLP脉冲造成器件阈值电压的变化量呈指数升高,通过拟合指数为0.11~0.15;TLP脉冲对沟道内载流子迁移率的影响不明显。

关键词：金属氧化物半导体场效应管电磁脉冲阈值电压跨导迁移率