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Application of the Störmer–Verlet-Like Symplectic Method to the Wave Equation

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Chinese Physics Letters 2013年第8期30卷 9-12页

作者： QIU Yu-Fen wu Xin School of Science Nanchang UniversityNanchang 330031

A fourth-order three-stage symplectic integrator similar to the second-order Störmer–Verlet method has been proposed and used before[***.28(2011)070201;*** 126(2011)73].Continuing the work initiated in the publications,we investigate the numerical performance of the integrator applied to a one-dimensional wave equation,which is expressed as a discrete Hamiltonian system with a fourth-order central difference approximation to a second-order partial derivative with respect to the space *** is shown that the Störmer–Verlet-like scheme has a larger numerical stable zone than either the Störmer–Verlet method or the fourth-order Forest–Ruth symplectic algorithm,and its numerical errors in the discrete Hamiltonian and numerical solution are also smaller.

关键词： Hamiltonian symplectic numerical

A New Feature in Some Quasi-discontinuous Systems

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Chinese Physics Letters 2000年第6期17卷 398-400页

作者： wu Shun-Guang HE Da-Ren Complexity Science Center Yangzhou UniversityYangzhou 225002 Institute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing 100875

Many systems can display a very short,rapid changing stage(quasi-discontinuous region)inside a relatively very long and slowly changing process.A quantitative definition for the"quasi-discontinuity"in these systems has been *** have shown by a simplified model that extra-large Feigenbaum constants can be found inside some period-doubling cascades due to the *** an example,this phenomenon has also been observed in Rose-Hindmash model describing neuron activities.

关键词： process. discontinuous quasi

Fluorescence emission modulation in cyanido-bridged Fe(Ⅱ)spin crossover coordination polymers

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Science China Chemistry 2022年第8期65卷 1569-1576页

作者： Xue-Ru wu Zhi-Kun Liu Min Zeng Ming-Xing Chen Jun Tao Shu-Qi wu Hui-Zhong Kou Department of Chemistry Tsinghua UniversityBeijing 100084China Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringLiangxiang CampusBeijing Institute of TechnologyBeijing 102488China Analytical Instrumentation Center College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Institute for Materials Chemistry and Engineering&IRCCS Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan

Synergistic fluorescent spin crossover(SCO)bifunctional molecular materials have novel applications in the molecule-based magneto-optical ***,we report two novel three-dimensional(3D)Hofmann-type fluorescent SCO complexes[Fe^(II)-(tppe)MI(CN)_(2)]ClO_(4)·nSolv(tppe=tetra-(4-pyridylphenyl)ethene,M=Ag(tppe-Ag),Au(tppe-Au)).Both complexes show one-step abrupt SCO with the transition temperature of 230 K for tppe-Ag,and 245 K for tppe-Au accompanied by a color change from red to light *** SCO process is confirmed by the variable-temperature single-crystal X-ray diffraction analysis on *** the first time,the abnormal increase in emission intensity and concomitant large bathochromic shifts in the fluorescence spectra during the SCO process are realized in the 3D Hofmann-type coordination polymers expanded by the tetradentate tppe ***,tppe-Ag exhibits the unprecedented fluorescence emission from green to the edge of yellow.

关键词： fluorescence spin crossover multifunctional materials coordination polymers synergetic effect

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The Rites of Mourning in Archaic and Classical Greece and in Pre-Qin China

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Fudan Journal of the Humanities and Social Sciences 2015年第2期8卷 235-270页

作者： Xiaoqun wu Department of History Fudan University 220 Handan Road Shanghai 200433 Chinae-mail: xqwu@ ***

This article attempts to compare the mourning of the dead before burial in Archaic and Classical Greece with that in Pre-Qin China. It focuses on three main subjects of mourning before burial--lamentation, mourners＇ gestures and behaviors, and mourning apparel--to demonstrate the cultural function and social influence of the mourning rituals through the analysis of the function and purpose of the mourning of two ancient peoples. We find that there are some differences in these two ancient societies, although the rites of mourning share some basic and similar procedures and functions.

关键词： Archaic and Classical Greece Pre-Qin China Mourning apparel Lamentation Mourners' gestures and behaviors Cultural function

Facile fabrication of drug-loaded PEGDA microcapsules for drug evaluation using droplet-based microchip

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Chinese Chemical Letters 2022年第5期33卷 2697-2700页

作者： Xindi Sun Qirui wu Wei Li Xiuqing Gong Jun-Yi Ge Jinbo wu Xinghua Gao Materials Genome Institute Shanghai UniversityShanghai 200444China

Droplet-based microfluidic technology can be utilized as a microreactor to prepare novel functional monodisperse *** this study,a droplet-based microfluidic chip with surface modification,which allowed the one-step preparation of double emulsion *** O/W/O double emulsion using polyethylene(glycol)diacrylate(PEGDA)solution as the intermediate water phase was prepared by regulating the hydrophilicity and hydrophobicity of the chip surface,with PEGDA microcapsules prepared using UV *** then anti-tumor drug paclitaxel and neurotoxin 6-OHDA were encapsulated in microcapsules for drug and toxicology evaluation,*** to controls,drug-loaded mi-crocapsules caused a significant increase in the death rate of PC12 *** indicates that the obtained drug-loaded microcapsules could be used in drug evaluation and potentially in drug screening and deliv-ery.

关键词： PEGDA microcapsule Droplet-based microfluidic PC12 cells Drug evaluation

Thermal,Mechanical and Rheological Properties of Biodegradable Poly(propylene carbonate) and Poly(butylene carbonate) Blends

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Chinese Journal of Polymer Science 2015年第3期33卷 444-455页

作者： Dan-dan wu wu Li Yan Zhao Yun-jiao Deng 张会良 Hui-xuan Zhang Li-song Dong Changchun University of Technology Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied Chemistry

Poly（propylene carbonate）（PPC） was melt blended in a batch mixer with poly（butylene carbonate）（PBC） in an effort to improve the toughness of the PPC without compromising its biodegradability and biocompatibility. DMA results showed that the PPC/PBC blends were an immiscible two-phase system. With the increase in PBC content, the PPC/PBC blends showed decreased tensile strength, however, the elongation at break was increased to 230% for the 50/50 PPC/PBC blend. From the tensile strength experiments, the Pukanszky model gave credit to the modest interfacial adhesion between PPC and PBC, although PPC/PBC was immscible. The impact strength increased significantly which indicated the toughening effects of the PBC on PPC. SEM examination showed that cavitation and shear yielding were the major toughening mechanisms in the blends subjected the impact tests. TGA measurements showed that the thermal stability of PPC decreased with the incorporation of PBC. Rheological investigation demonstrated that the addition of PBC reduced the value of storage modulus, loss modulus and complex viscosity of the PPC/PBC blends to some extent. Moreover, the addition of PBC was found to increase the processability of PPC in extrusion. The introduction of PBC provided an efficient and novel toughened method to extend the application area of PPC.

关键词： Biodegradable Poly(propylene carbonate) Poly(butylene carbonate) Blends,

Chinese patients with adult onset leukodystrophy caused by CST3 variants

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Journal of Genetics and Genomics 2024年第7期51卷 778-780页

作者： Yi Zhang Zhi-Ying wu Department of Medical Genetics and Center for Rare Diseases Zhejiang Key Laboratory of Rare Diseases for Precision Medicine and Clinical TranslationSecond Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiang 310009China Nanhu Brain-computer Interface Institute HangzhouZhejiang 314050China Department of Neurology Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiang 310009China MOE Frontier Science Center for Brain Science and Brain-machine Integration School of Brain Science and Brain MedicineZhejiang UniversityHangzhouZhejiang 310012China

Leukodystrophies represent a group of cerebral white matter disorders that mainly affect axon-glia *** disorders are clinically diverse and display significant genetic *** is challenging to differentiate hereditary leukodystrophies,particularly those that present in adulthood,from acquired leukodystrophies and other genetic disorders,such as multiple sclerosis(MS)or hereditary spastic paraplegia(HSP)(Wei et al.,2021).Over the past few decades,a series of causative genes associated with leukodystrophies have been identified(Kohler et al.,2018).Nevertheless,a significant proportion of patients still lack a precise molecular diagnosis.

关键词： al. patients Kohler

How Does the Government Facilitate the Co-Production of Digital Public Safety Services?——Based on Empirical Evidence from Shenzhen

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Social Sciences in China 2024年第2期45卷 113-134页

作者： wu Xiaolin Zhou Enlai School of Government Nankai University

The application of big data technology provides support for the co-production of public safety *** research often focuses on how technology influences co-production,but lacks attention to the key actors that drive co-production and the mechanisms that facilitate *** study examines the role of government in the digital co-production of public safety services,using the practice of Shenzhen as a case *** has built 125 information systems based on over 100 billion pieces of big data,forming a model of digital safety service *** study reveals three types of digital co-production,characterized by"government-business joint planning,passive participation of businesses and the public,and active cooperation among government,businesses,and the public"in the"design-production-application"*** study shows that the government is not only a co-producer but also a proactive actor in activating the willingness of non-governmental entities to *** governments mobilize non-governmental participation through three mechanisms:empowerment,profit enhancement,and value ***"power-interest-value"paradigm is applicable for analyzing the co-production of public services and helps to explain the transformation mechanisms of co-production behavior.

关键词： public safety co-production smart emergency response digital public safety

Evaluation of numerical earthquake forecasting models

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Earthquake Science 2022年第4期35卷 293-296页

作者： Zhongliang wu Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China

Evaluation of numerical earthquake forecasting models needs to consider two issues of equal importance:the application scenario of the simulation,and the complexity of the *** of the evaluation-based model selection f... 详细信息

关键词： numerical earthquake forecasting model selection Akaike information criteria(AIC)