检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

一类二阶微分方程的解和小函数的关系

数学年刊（A辑） 2006年第4期27卷 431-442页

作者：陈宗煊孙光镐华南师范大学数学科学学院广州510631 釜山大学自然科学学院数学系

在文中研究了一类二阶线性微分方程的解以及它们的一阶,二阶导数,微分多项式与小函数之间的关系．

关键词：微分方程收敛指数整函数

On subnormal solutions of second order linear periodic differential equations

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2007年第6期50卷 786-800页

作者： kwang ho shon Department of Mathematics College of Natural SciencesPusan National UniversityPusan 609-735Karea

In this paper, we investigate the existence and the form of subnormal solution for a class of second order periodic linear differential equations, estimate the growth properties of all solutions, and answer the questi... 详细信息

关键词： periodic differential equation subnormal solution hyper order 30D35 34M10

ON EXISTENCE OF SOLUTIONS OF DIFFERENCE RICCATI EQUATION

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2019年第1期39卷 139-147页

作者： Zongxuan CHEN kwang ho shon School of Mathematical Sciences South China Normal University Department of Mathematics College of Natural Sciences Pusan National University

Consider the difference Riccati equation f(z+1) =(A(z)f(z)+B(z))/(C(z)f(z)+D(z)),where A,B, C,D are meromorphic functions, we give its solution family with one-parameter H(f(z))={f_0(z),f(z)=((f_1(z)-f_0(z))(f_2(z)-f_0(z)))/(Q(z)(f_2(z)-f_1(z))+(f_2(z)-f_0(z)))}, where Q(z) is any constant in C or any periodic meromorphic function with period 1, and f_0(z),f_1(z),f_2(z) are its three distinct meromorphic solutions.

关键词： difference Riccati equation solution family order of growth

Some Results on Difference Riccati Equations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2011年第6期27卷 1091-1100页

作者： Zong Xuan CHEN kwang ho shon School of Mathematical Sciences South China Normal University Guangzhou 510631 P. R. China Department of Mathematics College of Natural Sciences Pusan National University Pusan 609-735 Korea

Some properties of solutions for the difference Riccati equations are obtained. The existence and forms of rational solutions, and the Borel exceptional value, zeros, poles and fixed points of transcendental solutions... 详细信息

关键词： Difference Riccati equation rational solution transcendental solution Borel exceptionalvalue

Numbers of Subnormal Solutions for Higher Order Periodic Differential Equations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2011年第9期27卷 1753-1768页

In this paper, we estimate the number of subnormal solutions for higher order linear periodic differential equations, and estimate the growth of subnormal solutions and all other solutions. We also give a representati... 详细信息

关键词： Periodic differential equation subnormal solution hyper-order

On the Growth and Fixed Points of Solutions of Second Order Differential Equations with Meromorphic Coefficients

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2005年第4期21卷 753-764页

作者： Zong Xuan CHEN kwang ho shon Department of Mathematics South China Normal University Guangzhou 510631 P. R. China Department of Mathematics College of Natural Sciences Pusan National University Pusan 609-735 Korea

In this paper, we investigate the growth and fixed points of solutions and their 1st, 2nd derivatives, differential polynomial of second order linear differential equations with meromorphic coefficients, and obtain th... 详细信息

关键词： Differential equation Meromorphic function Order of growth Fixed point

Effects of various sintering methods on microstructure and mechanical properties of CP-Ti powder consolidations

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 59-67页

作者： Je-ha shon Jong-moon PARK Kyeong-sik Cho Jae-keun hoNG Nho-kwang PARK Myung-hoon OH Department of Advanced Materials Engineering Kumoh National Institute of Technology Gumi Gyeongbuk 730-701 Korea Advanced Technology Team Pohang Institute of Metal Industry Advancement Pohang Gyeongbuk 790-834 Korea Titanium Department Korea Institute of Materials Science (KIMS) Changwon Gyeongnam 642-831 Korea

Effects of various sintering methods such as spark plasma sintering(SPS), hot pressing(HP) and electric resistance sintering(ERS) on the microstructure and mechanical properties of commercial pure titanium(CP-Ti) powder consolidations with particle size of however, in case of ERS, CP-Ti powders were densified almost at 950 °C under 30 MPa. The microstructure of sintered titanium is composed of equiaxed grains at 850-950 °C. The yield strength of sintered body composed of however, when ERS is introduced, the highest yield strength is 441 MPa at 950 °C under 30 MPa, which shows much lower values than those by SPS and HP methods. ERS method takes much less sintering time compared with SPS and HP. Nevertheless, higher sintering temperature results in lower strength and elongation because of brittle fracture.

关键词： CP-Ti powders sintering method spark plasma sintering hot pressing electrical resistance sintering

Comparison of the rheological properties of four root canal sealers

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2015年第1期7卷 56-61页

作者： Seok Woo Chang Young-Kyu Lee Qiang Zhu Won Jun shon Woo Cheol Lee Kee Yeon Kum Seung ho Baek In Bog Lee Bum-Soon Lim kwang Shik Bae Department of Conservative Dentistry School of Dentistry Kyung Hee University National Instrumentation Center for Environmental Management Seoul National University Department of Endodontology School of Dental Medicine University of Connecticut Health Center Department of Conservative Dentistry Dental Research Institute School of Dentistry Seoul National University Dental Hospital Seoul National University Dental Research Institute and Department of Dental Biomaterials School of Dentistry Seoul National University

The flowability of a root canal sealer is clinically important because it improves the penetration of the sealer into the complex root canal system. The purpose of this study was to compare the flowabilities of four root canal sealers, measured using the simple press method （ISO 6876）, and their viscosities, measured using a strain-controlled rheometer. A newly developed, calcium phosphate-based root canal sealer （Capseal） and three commercial root canal sealers （AH Plus, Sealapex and Pulp Canal Sealer EWT） were used in this study. The flowabilities of the four root canal sealers were measured using the simple press method （n= 5） and their viscosities were measured using a strain-controlled rheometer （n=5）. The correlation between these two values was statistically analysed using Spearman＇s correlation test. The flow diameters and the viscosities of the root canal sealers were strongly negatively correlated （p= -0.8618）. The viscosity of Pulp Canal Sealer EWT was the lowest and increased in the following order： AH Plus〈Sealapex〈Capseal （P〈0.05）. All of the tested root canal sealers showed characteristic time- and temperature-dependent changes in their rheological properties. The viscosities measured using the strain-controlled rheometer were more precise than the flowabilities measured using the simple press method, suggesting that the rheometer can accurately measure the rheological properties of root canal sealers.

关键词： Capseal rheological property root canal sealer strain-controlled rheometer

α1-COP modulates plasmodesmata function through sphingolipid enzyme regulation

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第8期66卷 1639-1657页

作者： Arya Bagus Boedi Iswanto Minh Huy Vu Jong Cheol shon Ritesh Kumar Shuwei Wu hobin Kang Da-Ran Kim Geon Hui Son Woe Yoen Kim Youn-Sig Kwak kwang Hyeon Liu Sang Hee Kim Jae-Yean Kim Division of Applied Life Science(BK21 FOUR Program) Plant Molecular Biology and Biotechnology Research CenterGyeongsang National UniversityJinju 52828Korea College of Pharmacy and Research Institute of Pharmaceutical Sciences Kyungpook National UniversityDaegu 702-701Korea Departement of Plant Medicine Gyeongsang National UniversityJinju 52828Korea Division of Life Science Gyeongsang National UniversityJinju 52828Korea

Callose,aβ-1,3-glucan plant cell wall polymer,regulates symplasmic channel size at plasmodesmata(PD)and plays a crucial role in a variety of plant ***,elucidating the molecular mechanism of PD callose homeostasis is *** screened and identified an Arabidopsis mutant plant with excessive callose deposition at PD and found that the mutated gene wasα1-COP,a member of the coat protein I(COPI)coatomer *** report that loss of function ofα1-COP elevates the callose accumulation at PD by affecting subcellular protein localization of callose degradation enzyme Pd *** process is linked to the functions of ERH1,an inositol phosphoryl ceramide synthase,and glucosylceramide synthase through physical interactions with theα1-COP ***,the loss of function ofα1-COP alters the subcellular localization of ERH1 and GCS proteins,resulting in a reduction of Glc Cers and Glc HCers molecules,which are key sphingolipid(SL)species for lipid raft *** findings suggest thatα1-COP protein,together with SL modifiers controlling lipid raft compositions,regulates the subcellular localization of GPI-anchored PDBG2 proteins,and hence the callose turnover at PD and symplasmic movement of *** findings provide the first key clue to link the COPI-mediated intracellular trafficking pathway to the callose-mediated intercellular signaling pathway through PD.

关键词： callose coatomer proteins membrane-bound vesicle plasmodesmata sphingolipid enzymes