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Weak Periodic Solutions of Non-Newtonian Viscous Incompressible Fluids

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Communications in Nonlinear Science and Numerical Simulation 1999年第1期4卷 56-60页

作者： Boling guo* and guoguang LTN** (Institute of Applied Physics and Computational Mathematics, Be1Jing 100088, China) and guoguang LTN (Graduate School of China Academy of Engineering Physics, Beijing 100088, China) + (Department of Mathematics, Yunnan Univ Inst. Appl. Phys. and Compl. Math. Beijing 100088 China Graduate School China Academy of Engineering Physics Beijing 100088 China Department of Mathematics Yunnan University Kunming 650091 China

The existence of weak periodic solution in time of non-Newtonian fluids with a time periodic forcing is established.

关键词： periodic solution weak periodic solution bipolar fluid

Steady State Solution for the Weakly Damped Forced Korteweg-de Vries Equation

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Communications in Nonlinear Science and Numerical Simulation 1998年第2期 71-76页

作者： Boling guo * and guoguang LIN **, * (Center for Nonlinear Studies,Institute of Applied Physics and Computational Mathematics, Beijing 100088, China) ** (Graduate School of China Academy of Engineering Physics, Beijing 100

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ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｗｅａｋｌｙｄａｍｐｅｄｆｏｒｃｅｄＫｏｒｔｅｗｅｇｄｅＶｒｉｅｓｅｑｕａｔｉｏｎｓｗａｓｓｔｕｄｉｅｄ［１］ｕｔ＋ｕｘｘｘ＋γｕ＋βｕｕｘ＝ｆ（ｘ）（１ｗｈｅｒｅγ＞０ａｎｄβａｒｅｒｅａｌｃｏｎｓｔａｎｔｓ．Ｗｅｃ...

关键词： KdV equation steady state solution third order boundary value problem asymptotic behavior

Structural analysis of receptor-like kinase SOBIR1 reveals mechanisms that regulate its phosphorylation-dependent activation

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Plant Communications 2022年第2期3卷 34-51页

作者： Xue Wei Yulu Wang Su Zhang Tianyi Gu Gabryel Steinmetz Haiyan Yu guoguang guo Xin Liu Shilong Fan Fengzhong Wang Yangnan Gu Fengjiao Xin Laboratory of Biomanufacturing and Food Engineering Institute of Food Science and TechnologyChinese Academy of Agricultural SciencesBeijing 100193China Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing Forestry UniversityBeijing 100083China Department of Plant and Microbial Biology University of CaliforniaBerkeleyCA 94720USA Innovative Genomics Institute University of CaliforniaBerkeleyCA 94720USA Key Laboratory of Ministry of Education for Protein Science School of Life SciencesTsinghua UniversityBeijing 100084China Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences University of Science and Technology of ChinaHefeiAnhui 230026China The Center of Protein Science Tsinghua UniversityBeijing 100084China

Plant leucine-rich repeat(LRR)receptor-like kinases(RLKs)and LRR receptor-like proteins(RLPs)comprise a large family of cell surface receptors that play critical roles in signal perception and *** LRR-RLKs and LRR-RLPs rely on regulatory LRR-RLKs to initiate downstream signaling *** INSENSITIVE 1-ASSOCIATED KINASE 1/SOMATIC EMBRYOGENESIS RECEPTOR KINASE 3(BAK1/SERK3)and SUPPRESSOR OF BIR1-1(SOBIR1)are important and extensively studied regulatory LRR-RLKs with distinct *** the regulatory mechanism of BAK1 activation has been studied in detail,the activation mechanism of SOBIR1 remains poorly ***,the crystal structures of the catalytically inactive kinase domain of SOBIR1(SOBIR1-KD)from Arabidopsis thaliana were determined in complexes with AMP-PNP and Mg^(2+).The results show that SOBIR1-KD contains a uniquely long β3-αC loop and adopts an Src-like inactive conformation with an unusual architecture at the activation segment,which comprises three *** studies revealed that SOBIR1 is transphosphorylated by BAK1 following its autophosphorylation via an intermolecular mechanism,and the phosphorylation of Thr529 in the activation segment and the β3-αC loop are critical for SOBIR1 *** functional analysis confirmed the importance of Thr529 and the β3-αC loop for the SOBIR1-induced cell death response in Nicotiana *** together,these findings provide a structural basis for the regulatory mechanism of SOBIR1 and reveal the important elements and phosphorylation events in the special stepwise activation of SOBIR1-KD,the first such processes found in regulatory LRR-RLKs.

关键词： LRR-RLK SOBIR1 crystal structure unusual architecture autophosphorylation stepwise activation

农民工返乡创业何以缩小县域城乡收入差距——基于返乡创业试点政策的考察

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中国人口科学 2024年第5期 50-65页

作者：郭东李琳庞国光乔璐湖南大学经济与贸易学院山东理工大学经济学院

引导农民工返乡创业，既是改善劳动力空间错配的有效手段，又是缩小城乡收入差距的重要路径。文章使用全国县级面板数据，运用双重差分法考察了农民工返乡创业试点政策对城乡收入差距的影响及其空间溢出效应。研究发现，农民工返乡创业... 详细信息

引导农民工返乡创业，既是改善劳动力空间错配的有效手段，又是缩小城乡收入差距的重要路径。文章使用全国县级面板数据，运用双重差分法考察了农民工返乡创业试点政策对城乡收入差距的影响及其空间溢出效应。研究发现，农民工返乡创业试点政策能显著缩小城乡收入差距，这一结果经过一系列稳健性检验后依然成立。农民工返乡创业试点政策缩小城乡收入差距的作用在中西部县域、粮食主产县和劳务输出县中更为突出。机制分析表明，农民工返乡创业试点政策可以通过促进产业结构升级、缓解融资约束和提高创新水平来缩小城乡收入差距。进一步研究发现，农民工返乡创业试点政策存在空间溢出效应，在缩小本地城乡收入差距的同时，拉大了邻近县域的城乡收入差距。文章研究结论为优化农民工返乡创业政策、缩小城乡收入差距提供了重要的经验证据。

关键词：返乡创业城乡收入差距双重差分法空间溢出效应

不同退火氛围下MgZnO-TFT的制备及其性能

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液晶与显示 2024年第10期39卷 1295-1303页

作者：王超郝云鹏郭亮杨帆乔国光吉林建筑大学寒地建筑综合节能教育部重点实验室吉林长春130118 吉林建筑大学电气与计算机学院吉林长春130118 纬湃汽车电子(长春)有限公司吉林长春130033

为探求退火氛围对镁锌氧化物薄膜晶体管性能的影响,本文采用射频磁控溅射法制备了MgZnO薄膜,并以其为沟道层构建了底栅顶接触结构的MgZnO-TFT器件。将所制备的MgZnO薄膜分别在空气、真空、氧气、氮气4种不同氛围下进行500℃、时长1 h的... 详细信息

为探求退火氛围对镁锌氧化物薄膜晶体管性能的影响,本文采用射频磁控溅射法制备了MgZnO薄膜,并以其为沟道层构建了底栅顶接触结构的MgZnO-TFT器件。将所制备的MgZnO薄膜分别在空气、真空、氧气、氮气4种不同氛围下进行500℃、时长1 h的退火处理,通过原子力显微镜扫描(AFM)和X射线光电子能谱(XPS)技术对薄膜进行表征分析,结果表明,在真空氛围下退火处理后,MgZnO薄膜质量较好,器件性能最佳,场效应迁移率为0.29 cm^(2)·V^(-1)·s^(-1),阈值电压为2.28 V,亚阈值摆幅为3.6 V·dec^(-1),电流开关比为1.68×10^(6)。分析认为,这可能是由于在真空氛围下退火时可以在一定程度上隔绝外界干扰,有效避免了有源层薄膜缺陷的产生。同时我们研究测试了器件的正偏压应力(PBS)和负偏压应力(NBS)的稳定性。在不同栅偏压应力下,TFT均展现了良好的稳定性。在正偏置压力为10 V、应力时间为3000 s时,相比ZnO-TFT,真空氛围下进行退火优化的MgZnO-TFT阈值电压漂移从1.38 V降低至0.54 V。结果表明,在氧化锌中掺杂镁元素制备MgZnO薄膜作为TFT的有源层对TFT器件的电学稳定性有一定程度的改善。

关键词： MgZnO-TFT 退火氛围 XPS 稳定性

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中国农民农村共同富裕:特征事实及障碍因素

湖南农业大学学报（社会科学版） 2024年第3期25卷 30-42页

作者：李琳庞国光郭东湖南大学经济与贸易学院湖南长沙410082

在系统阐述农民农村共同富裕理论内涵的基础上,从物质富裕、精神富裕、协调发展、成果共享四个维度构建评价指标体系,并基于2006—2022年中国31个省(区、市)的面板数据测度农民农村共同富裕水平,考察其演化特征及障碍因素。研究发现:农... 详细信息

在系统阐述农民农村共同富裕理论内涵的基础上,从物质富裕、精神富裕、协调发展、成果共享四个维度构建评价指标体系,并基于2006—2022年中国31个省(区、市)的面板数据测度农民农村共同富裕水平,考察其演化特征及障碍因素。研究发现:农民农村共同富裕水平稳步提升,区域间呈现“东高、中次、西低”的梯度分布格局,但西部地区后发优势显著;富裕方面是推动农民农村共同富裕的主导力量,物质富裕、成果共享、协调发展、精神富裕的水平依次递减;农民农村共同富裕的绝对差异在扩大,相对差异逐渐缩小,极化现象有所减弱,区域间差异是构成总体差异的主要来源;农民农村共同富裕水平呈现“高-高”和“低-低”的空间集聚模式,“先富带动后富”的空间辐射效应逐渐增强;共同方面是制约农民农村共同富裕的主要障碍,协调发展维度是核心障碍,农村社会保障、农村公共文化设施、地区农民收入包容水平、农民收入水平和农村教育资源则是主要障碍因素。

关键词：共同富裕农民农村特征事实时空演变障碍因素

Fixed-Time Adaptive Time-Varying Matrix Projective Synchronization of Time-Delayed Chaotic Systems with Different Dimensions

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Computer Modeling in Engineering & Sciences 2022年第6期131卷 1451-1463页

作者： Peng Zheng Xiaozhen guo guoguang Wen Department of Computer Science University of LiverpoolLiverpoolL693BXUK ORDOS No.1 High School East Campus Erdos017010China Department of Mathematics Beijing Jiaotong UniversityBeijing100044China

This paper deals with the fixed-time adaptive time-varying matrix projective synchronization(ATVMPS)of different dimensional chaotic systems(DDCSs)with time delays and unknown ***,to estimate the unknown parameters,adaptive parameter updated laws are ***,to realize the fixed-time ATVMPS of the time-delayed DDCSs,an adaptive delay-unrelated controller is designed,where time delays of chaotic systems are known or ***,some simple fixed-time ATVMPS criteria are deduced,and the rigorous proof is provided by employing the inequality technique and Lyapunov ***,the settling time of fixed-time synchronization(Fix-TS)is obtained,which depends only on controller parameters and system parameters and is independent of the system’s initial ***,simulation examples are presented to validate the theoretical analysis.

关键词： Time-varying matrix projective synchronization(TVMPS) fixed-time control unknown parameters different dimensions time-delayed chaotic systems(TDCSs)

LaSr_2Mn_2O_7 Ruddlesden-Popper manganites for oxygen reduction and electrochemical capacitors

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Journal of Rare Earths 2020年第7期38卷 763-769,I0003页

作者： Qin Li Meitian guo Kaiyuan Wang Zhiqiang Wei guoping Du guoguang Zhang Nan Chen School of Materials Science and Engineering Nanchang UniversityNanchang 330031China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

LaSr2 Mn2 O7,a Ruddlesden-Popper type bilayered perovskite,was investigated as oxygen catalyst for oxygen reduction reaction(ORR) and active electrode material for electrochemical capacitors in KOH *** results show that Mn takes a mixed Mn2+,Mn3+and Mn4+valence state with an average valence of *** catalyst towards ORR,LaSr2 Mn2 O7 and LaSr2 Mn2 O7/acetylene black composite favor four electron pathways for ***2 Mn2 O7/C composite shows a comparable onset potential for ORR to that of Pt/C *** improved ORR activity of LaSr2 Mn2 O7/acetylene black composite is attributed to the synergy between catalytic LaSr2 Mn2 O7 and conductive acetylene *** electrode material for electrochemical capacitors,LaSr2 Mn2 O7 exhibits a maximum specific capacitance of 167.2 F/g with 62%faradic contribution at a scan rate of 1 mV/s in cyclic voltammetry test.

关键词： LaSr2Mn2O7 Oxygen reduction reaction Electrochemical capacitor Rare earths

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铸态铝及铝合金三辊斜轧穿孔工艺的研究

上海金属 1987年第2期 13-18页

作者：杨守山李玉芝肖寅昕曹铁荣郭宝印吕培成郭国光吴殿英西安冶金建筑学院宝鸡有色金属加工厂

采用三辊斜轧穿孔法将铸态铝及铝合金制成毛管后,可直接进行冷加工,成品管机械性能达到YB611-66标准,效率、产量和质量等经济技术指标均比挤压管及空心锭轧制管更高,成本更低。

关键词：铝合金斜轧穿孔轻有色金属合金铸态轧辊倾角毛管辊型设计轧辊辊型成品管轧件