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东盟的中心地位:一个网络视角的分析

世界经济与政治 2019年第7期 77-105,157-158页

作者：董贺暨南大学国际关系学院/华侨华人研究院

东盟在东亚区域合作中的中心地位是近年来学界的重要议题,而对这一问题的刻画和测度仍然需要更加深入和细化的研究。根据社会网络理论与分析法,在关系网络的情境下,中心性指标能够量化行为体在网络结构中的位置和重要性,进而反映行为体... 详细信息

东盟在东亚区域合作中的中心地位是近年来学界的重要议题,而对这一问题的刻画和测度仍然需要更加深入和细化的研究。根据社会网络理论与分析法,在关系网络的情境下,中心性指标能够量化行为体在网络结构中的位置和重要性,进而反映行为体的地位与影响力。网络分析证明,在东亚区域合作网络中,东盟具有最高的中心性,表明东盟在同各国的直接关系数量、对资源和信息的影响以及对各国间关系的控制和调解上具有最大的优势,在制度和互动层面占据中心地位。当前的东亚区域合作可被视为一个以东盟为中心的关系网络。在这一网络结构中,各种合作机制和政治、安全、经济等具体领域的互动建构了东盟与各国之间的关系,使其能够在区域合作议程的制定与规范的形成中发挥关键性作用,引导并协调区域合作中复杂的大国关系及影响。通过建构并巩固中心地位,东盟得以在保障和实现自身利益诉求的同时,将东亚区域合作网络中的主体紧密地联结在一起,共同推动东亚一体化进程。

关键词：东盟中心地位关系网络中心性

Linking Genetic Risks to Pathologicalα-Synuclein Transmission in Parkinson's Disease

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Neuroscience Bulletin 2023年第7期39卷 1186-1188页

作者： Xiaoqing Mi Lei Chen Junxia Xie ning Song Department of Physiology School of Basic MedicineInstitute of Brain Science and DiseaseShandong Provincial Key Laboratory of Pathogenesis and Prevention of Neurological DisordersQingdao UniversityQingdao 266071China

Misfoldedα-synuclein(α-syn)hallmarks the neuropathological characteristics of Parkinson's disease(PD)and acts as a"pathological seed"that promotes the progression of the disease[1].About 15%of PD patients have a family history,5%-10%have a monogenic disorder with a Mendelian pattern of inheritance[2],and>90 independent risk signals identified by genome-wide association studies(GWASs)can be used to explain the non-monogenic risk of PD[3].

关键词： patients Pathological pattern

Fully integrated low phase noise multi-band LC-tank voltage controlled oscillator with switched-capacitor resonator

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The Journal of China Universities of Posts and Telecommunications 2012年第6期19卷 118-122页

作者： LI Bin FAN Xiang-ning WANG Zhi-gong School of Information Science and Engineering Southeast University

This paper presents the design and implementation of a fully integrated low noise multi-band LC-tank voltage-controlled-oscillator （VCO）. Multi-band operation is achieved by using switched-capacitor resonator. Additional three-bit binary weighted capacitor array is also used to extend frequency tuning range in each band. To lower phase noise, two noise filters are added and a linear varactor is adopted. Implemented in a 0.18 ~tm complementary-metal- oxide-semiconductor （CMOS） process, the VCO achieves a frequency tuning range covering 2.26-2.48 GHz, 2.48- 2.78 GHz, 2.94-3.38 GHz, and 3.45-4.23 GHz while occupies a chip area of 0.52 mm2. With a 1.8 V power supply, it draws a current of 10.9 mA, 10.6 mA, 8.8 mA, and 6.2 mA from the lowest band to the highest band respectively. The measured phase noise is - 109-- 120 dBc/Hz and - 121-- 131 dBc/Hz at a 1 MHz and 2.5 MHz offset from the carrier, respectively.

关键词： VCO multi-band phase noise linear varactor CMOS

Three-dimensional cytoplasmic calcium propagation with boundaries

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Communications in Theoretical Physics 2021年第1期73卷 87-98页

作者： Han-Yu Jiang Jun he Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing210097China Sino-U.S.Center for Grazingland Ecosystem Sustainability/Pratacultural Engineering Laboratory of Gansu Province/Key Laboratory of Grassland Ecosystem Ministry of Education/College of Pratacultural ScienceGansu Agricultural UniversityLanzhou730070China

Ca^(2+)plays an important role in cell signal *** intracellular propagation is the most basic process of Ca^(2+)signaling,such as calcium wave and double messenger *** this work,with both numerical simulation and mean field ansatz,the three-dimensional probability distribution of Ca^(2+),which is read out by phosphorylation,is studied in two scenarios with *** coverage of distribution of Ca^(2+)is found at an order of magnitude ofμm,which is consistent with experimental observed calcium spike and *** results suggest that the double messenger system may occur in the ER-PM junction to acquire great *** buffer effect of kinase is also discussed by calculating the average position of phosphorylations and free Ca^(2+).The results are helpful to understand the mechanism of Ca^(2+)signaling.

关键词： Ca^(2+)signaling diffusion Gillespie algorithm mean field ansatz

Impurity formation mechanism of silicon carbide crystals smelted by Acheson process

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Journal of Iron and Steel Research International 2024年第6期31卷 1367-1375页

作者： dong Feng Hong-qiang Ru Xu-dong Luo Jie-gang You Ling Zhang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Institute of Advanced CeramicsSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819LiaoningChina Liaoning Institute of Science and Technology Benxi 117004LiaoningChina

In order to further promote the application of SiC refractories in modern steel metallurgy,the occurrence forms and formation mechanism of impurities in SiC crystals smelted by Acheson process were *** techniques of inductively coupled plasma-atomic emission spectrometry,X-ray diffraction,and scanning electron microscopy were combined to examine the types and occurrence forms of impurities in smelted SiC *** results showed that the main impurities in the SiC are free Si,free C,oxides(CaO·Al_(2)O_(3)·2SiO_(2),3Al_(2)O_(3)·2SiO_(2),CaO·SiO_(2) and SiO_(2))and alloy phases(Fe_(x)Si_(y),Fe_(x)Si_(y)Ti_(z) and Fe_(x)Al_(y)Si_(z)).The formation process of impurities during the smelting of SiC can be described as follows:At high temperature,the SiO_(2) and Fe,Ti related oxide impurities present in the raw materials are reduced to Si,Fe,and Ti metal *** the reduction process,the free Si,Fe_(x)Si_(y) and Fe_(x)Si_(y)Ti_(z) are precipitated from the melt during *** Si primarily exists in aggregated form within the SiC crystal,while the alloy phase is predominantly found at the interface between SiC and free Si,with Fe_(x)Si_(y)Ti_(z) embedded within *** the end of the cooling process,other impurity oxides such as Al_(2)O_(3),CaO,and some unreduced SiO_(2) solidify to form calcium-aluminum-silicate glass phases,predominantly located between SiC *** remaining C from the reaction is mainly dispersed as free C within the SiC crystal and at the interface between SiC and free Si.

关键词： Impurity element Formation mechanism Smelted SiC crystal SiC refractory Occurrence form

Selective modification of two-dimensional MoS_2 nanosheets by polymer grafting

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Chinese Chemical Letters 2019年第2期30卷 311-313页

作者： Hang Bian Xuejian Zhang Dexin Huang ning Zhang School of Material Science and Engineering Jilin Jianzhu University Key Laboratory of Synthetic Rubber Changchun Institute of Applied ChemistryChinese Academy of Sciences

As an emerging two-dimensional (2D) nanomaterial, single layer ora few layers of molybdenum disulfide (MoS_2) has drawn significant attention in the past decade. In the present work, we report a strategy in direct creating polymer brushes on MoS_2 surfaces via S—C bond in the presence of UV light. The modification of MoS_2 nanosheets can be achieved bilaterally or homolaterally by performing the UVgrafting polymerization on exfoliated MoS_2 nanosheets or a single layer of MoS_2 deposited on a silicon substrate. A series of vinyl monomers including methyl methacrylate (MMA), styrene (St) and 2-isopropenyl-2-oxazoline (IPOx) could be applied to this approach, leading to the formation of poly (methyl methacrylate) (PMMA), polystyrene (PS) and poly (2-isopropenyl-2-oxazoline) (PIPOx) ***, IR, and XPS characterizations indicate the successful formation of homogeneous brush layers on MoS_2 surfaces. The polymer brushes modified MoS_2 may found potential applications in photo dynamic therapy and sensing technologies.

关键词： Molybdenum disulfide Polymer brushes SIPGP Surface modification S-C bond

New Minor Cyclopeptides from Arenaria oreophila (Caryophyllaceae)

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Chinese Chemical Letters 2006年第4期17卷 477-480页

作者： Ai Qun JIA ning Hua TAN Jun ZHOU State Key Laboratory of Phytochemistry and Plant Resources in West China Kuning Institute of Botany Graduate School of the Chinese Academy of Sciences Chinese Academy of Sciences Kunming 650204

New minor cyclic peptides, named arenariphilin C 1 and arenariphilin D 2, were isolated from the whole plants of Arenaria oreophila （Caryophyllaceae）. Their structures were determined as cyclo（Pro^1-Pro2-Leu^1-Leu2-Phe-Ser-Gly-Thr） and cyclo （Ser-Cys） on the basis of spectroscopic data, especially by two-dimension NMR （2D NMR） technologies.

关键词： Arenaria oreophila Caryophyllaceae cyclopeptide arenariphilin C arenariphilin D.

Regression Analysis of Interval-Censored Data with Informative Observation Times Under the Accelerated Failure Time Model

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Journal of Systems Science & Complexity 2022年第4期35卷 1520-1534页

作者： ZHAO Shishun dong Lijian SUN Jianguo Center for Applied Statistical Research School of MathematicsJilin UniversityChangchun130012China Department of Statistics University of MissouriColumbiaMO65211USA

This paper discusses regression analysis of interval-censored failure time data arising from the accelerated failure time model in the presence of informative *** the problem,a sieve maximum likelihood estimation approach is proposed and in the method,the copula model is employed to describe the relationship between the failure time of interest and the censoring or observation *** I-spline functions are used to approximate the unknown functions in the model,and a simulation study is carried out to assess the finite sample performance of the proposed approach and suggests that it works well in practical *** addition,an illustrative example is provided.

关键词： Accelerated failure time model copula models informative censoring interval-censored data splines

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Lewis acid-doped transition metal dichalcogenides for ultraviolet–visible photodetectors

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Chinese Physics B 2024年第9期33卷 628-635页

作者： heng Yang Mingjun Ma Yongfeng Pei Yufan Kang Jialu Yan dong he Changzhong Jiang Wenqing Li Xiangheng Xiao School of Physics and Technology Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of EducationWuhan UniversityWuhan 430072China Wuhan Research Center for Infectious Diseases and Cancer Chinese Academy of Medical SciencesWuhan 430072China

Ultraviolet photodetectors(UV PDs)are widely used in civilian,scientific,and military fields due to their high sensitivity and low false alarm *** present a temperature-dependent Lewis acid p-type doping method for transition metal dichalcogenides(TMDs),which can effectively be used to extend the optical response *** p-type doping based on surface charge transfer involves the chemical adsorption of the Lewis acid SnCl_(4)as a light absorption layer on the surface of WS_(2),significantly enhancing its UV photodetection *** 365 nm laser irradiation,WS_(2)PDs exhibit response speed of 24 ms/20 ms,responsivity of 660 mA/W,detectivity of 3.3×10^(11)Jones,and external quantum efficiency of 226%.Moreover,we successfully apply this doping method to other TMDs materials(such as MoS_(2),MoSe_(2),and WSe_(2))and fabricate WS_(2) lateral p–n heterojunction PDs.

关键词： two-dimensional(2D)materials p-type doping transition metal dichalcogenides photodetectors