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

基于符号计算的变系数KP方程的孤子解

计算机技术与发展 2019年第2期29卷 73-76页

作者：薛瑞梅王书敏姚若侠陕西师范大学计算机科学学院陕西西安710119

计算机代数是数学和计算机科学以及人工智能的交叉学科,致力于研究在计算机上进行符号计算。Maple是世界上应用最广泛的符号计算系统,可以将复杂繁琐的计算过程算法化,交由计算机处理,将人类的双手解放出来,极大地提高了计算效率。文中... 详细信息

计算机代数是数学和计算机科学以及人工智能的交叉学科,致力于研究在计算机上进行符号计算。Maple是世界上应用最广泛的符号计算系统,可以将复杂繁琐的计算过程算法化,交由计算机处理,将人类的双手解放出来,极大地提高了计算效率。文中以符号计算系统Maple为工作平台,采用修正的CK直接约化方法,将变系数KP方程约化为等价常系数方程,获得到了变系数与常系数方程的关系及解。通过推广的Painlevé非标准截断方法求得相应的常微分方程的解,进而得到变系数微分方程的解,分析了常系数KP方程的孤子解。研究表明,借助符号计算Maple系统,修正的CK直接约化方法和Painlevé非标准截断方法的结合不仅能对变系数偏微分方程轻松求解,还可节省计算时间,并广泛应用于若干数学物理模型中。

关键词：符号计算变系数KP方程 CK约化 Painlevé非标准截断展开孤子解

Invariant Functions, Symmetries and Primary Branch Solutions of First Order Autonomous Systems

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2017年第7期67卷 21-28页

作者： Sen-Yue Lou ruo-xia yao Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai 200062 China Ningbo Collabrative Innovation Center of Nonlinear Harzard System of Ocean and Atmosphere and Faculty of Science Ningbo University Ningbo 315211 China School of Computer Science Shaanxi Normal University Xi＇an 710062 China

An invariant function （IF） is defined as a multiplier of a symmetry that means a symmetry multiplied by an IF is still a symmetry. Primary branch solutions of arbitrary first order scalar systems can be obtained by means of the IF and its related symmetry approach. Especially, one recursion operator and some sets of infinitely many high order symmetries are also explicitly given for arbitrary （l q-1）-dimensional first order autonomous systems. Because of the intrusion of the arbitrary function, various implicit special exact solutions can be found by fixing the arbitrary functions and selecting different seed solutions.

关键词： invariant functions symmetries exact solutions invariant operators recursion Operators

在线全文

学校读者我要写书评

暂无评论

伴3号染色体异常的18例恶性血液病分析

热带医学杂志 2017年第8期17卷 1060-1062,1074页

作者：王述文饶若姚红霞吴莉芳海南省人民医院血液病研究室海南海口570311

目的探讨3号染色体异常在恶性血液病中的发生及预后意义。方法采用R带常规显带技术进行染色体检查,对18例恶性血液病患者的核型进行分析。结果 2254例恶性血液病患者中检出伴3号染色体异常18例(0.8%),其中伴3q异常12例(66.7%),3p异常6例... 详细信息

目的探讨3号染色体异常在恶性血液病中的发生及预后意义。方法采用R带常规显带技术进行染色体检查,对18例恶性血液病患者的核型进行分析。结果 2254例恶性血液病患者中检出伴3号染色体异常18例(0.8%),其中伴3q异常12例(66.7%),3p异常6例(33.3%),前者检出率明显高于后者;伴3q异常的12例患者中,有3q21或3q26异常者6例(50.0%),包括2例t(3;3)。12例进行化疗的患者中只有2例获得完全缓解。结论累及3q异常是3号染色体最为常见的核型改变,其中又以3q21和3q26异常检出率最多;伴3号染色体异常的恶性血液病患者预后较差。

关键词： 3号染色体异常细胞遗传学恶性血液病

3D Printing of Tough Hydrogel Scaffolds with Functional Surface Structures for Tissue Regeneration

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 18-45页

作者： Ke yao Gaoying Hong Ximin Yuan Weicheng Kong Pengcheng xia Yuanrong Li Yuewei Chen Nian Liu Jing He Jue Shi Zihe Hu Yanyan Zhou Zhijian Xie Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Liangzhu Laboratory Zhejiang UniversityHangzhou 310027People’s Republic of China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province College of Mechanical EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Stomatology Hospital School of StomatologyZhejiang University School of MedicineHangzhou 310027People’s Republic of China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001People’s Republic of China Institute of Digital Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006People’s Republic of China

Hydrogel scaffolds have numerous potential applications in the tissue engineering ***,tough hydrogel scaffolds implanted in vivo are seldom reported because it is difficult to balance biocompatibility and high mechanical *** by Chinese ramen,we propose a universal fabricating method(printing-P,training-T,cross-linking-C,PTC&PCT)for tough hydrogel scaffolds to fill this ***,3D printing fabricates a hydrogel scaffold with desired structures(P).Then,the scaffold could have extraordinarily high mechanical properties and functional surface structure by cycle mechanical training with salting-out assistance(T).Finally,the training results are fixed by photo-cross-linking processing(C).The tough gelatin hydrogel scaffolds exhibit excellent tensile strength of 6.66 MPa(622-fold untreated)and have excellent ***,this scaffold possesses functional surface structures from nanometer to micron to millimeter,which can efficiently induce directional cell ***,this strategy can produce bionic human tissue with mechanical properties of 10 kPa-10 MPa by changing the type of salt,and many hydrogels,such as gelatin and silk,could be improved with PTC or PCT *** experiments show that this scaffold can effectively promote the new generation of muscle fibers,blood vessels,and nerves within 4 weeks,prompting the rapid regeneration of large-volume muscle loss injuries.

关键词： 3D printing Tough hydrogel scaffold Functional surface structure Tissue regeneration Biomaterials

New Bilinear B?cklund Transformation and Higher Order Rogue Waves with Controllable Center of a Generalized(3+1)-Dimensional Nonlinear Wave Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第2期71卷 161-169页

作者： Ya-Li Shen ruo-xia yao Yan Li School of Computer Science Shaanxi Normal UniversityXi’an 710119China School of Mathematics and Information Technology Yuncheng UniversityYuncheng 044000China

In this paper, we first obtain a bilinear form with small perturbation u_0 for a generalized(3+1)-dimensional nonlinear wave equation in liquid with gas bubbles. Based on that, a new bilinear B?cklund transformation which consists of four bilinear equations and involves seven arbitrary parameters is constructed. After that, by applying a new symbolic computation method, we construct the higher order rogue waves with controllable center to the generalized(3+1)-dimensional nonlinear wave equation. The rogue waves present new structure, which contain two free parametersα and β. The dynamic properties of the higher order rogue waves are demonstrated graphically. The graphs tell that the parameters α and β can control the center of the rogue waves.

关键词： generalized(3+1)-dimensional nonlinear wave equation bilinear B¨acklund transformation symbolic computation method rogue wave

Sulforaphane modulates TGFβ2-induced conjunctival fibroblasts activation and fibrosis by inhibiting PI3K/Akt signaling

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第10期13卷 1505-1511页

作者： Han-ruo Liu Zi-yao xia Ning-Li Wang Beijing Institute of Ophthalmology Beijing Tongren Eye CenterBeijing Tongren Hospital of Capital Medical UniversityBeijing Key Laboratory of Ophthalmology&Visual SciencesBeijing 100005China

AIM:To examine the effects of sulforaphane on fibrotic changes of transforming growth factor(TGFβ2)induced human conjunctival fibroblast(HCon Fs).METHODS:HCon Fs were cultured and divided into control,TGFβ2(1 ng/m L),sulforaphane and TGFβ2+sulforaphane *** viability and apoptosis were detected using the MTT and Apo Tox-Glo Triplex *** migration was detected using scratch and Transwell ***-time quantitative PCR method was used to evaluate m RNA expression of TGFβ2,matrix metalloproteinase-2(MMP2),myosin light chain kinase(MYLK),integrinαV,integrinα5,fibronectin 1 andα-smooth muscle actin(α-SMA).The protein expression ofα-SMA,p-PI3 K,PI3 K,p-Akt,and Akt were detected by Western ***:The proliferation of HCon Fs was significantly(P<0.05)suppressed by sulforaphane compared to control cells with the increase of the concentration and treatment *** proliferation after 48 h incubation was significantly reduced with 100μmol/L sulforaphane treatment by 17.53%(P<0.05).The Transwell assay showed sulforaphane decreased cell migration by 18.73%compared with TGFβ2-induced HCon F(P<0.05).TGFβ2-induced the increasing expression of fibronectin,type I collagen andα-SMA,and the phosphorylation of PI3 K and Akt were all significantly suppressed by sulforaphane ***:Sulforaphane inhibits proliferation,migration,and synthesis of the extracellular matrix in HCon Fs,and inhibiting the PI3 K/Akt signaling *** could be a potential therapeutic drug for prevention of scar formation in filtering bleb after trabeculectomy.

关键词： human conjunctival fibroblasts sulforaphane transforming growth factorβ2 PI3K/Akt signaling

A Drain Current Model Based on the Temperature Effect of a-Si:H Thin-Film Transistors

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

Chinese Physics Letters 2012年第9期29卷 162-165页

作者： QIANG Lei yao ruo-He School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510640

Based on the differential Ohm's law and Poisson's equation,an analytical model of the drain current for a-Si:H thin-film transistors is *** model is proposed to elaborate the temperature effect on the drain current,which indicates that the drain current is linear with temperature in the range of 290–360 K,and the results fit well with the experimental data.

关键词： drain film law

Synthesis and electrochemical properties of 2,6-bis(6-aryl-[1,2,4]- triazolo[3,4-b][1,3,4]-thiadiazole-3-yl)pyridines

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

Chinese Chemical Letters 2007年第5期18卷 505-508页

作者： Chun xia Tan ruo Fei Feng xiao xia Peng The College of Traditional Medicine of Gansu Lanzhou 730030 China Life Science ＆ Engineering College Northwest University for Nationalities Lanzhou 730030 China

By the condensation of 2,6-bis（4-amino-5-mercapto-[1,2,4]-triazoles-2）pyridine with aromatic acid in the presence of phosphorus oxychloride. Compounds of 2,6-bis（6-aryl-[1,2,4]-triazolo[3,4-b][1,3,4]-thiadiazole-3-yl）pyridines were synthesized. Their structures were confirmed by IR, ^1H NMR spectroscopies and elemental analysis. Their electrochemical behavior and cyclic voltammogram also were be studied. The results showed that they have high ionization potentials and good affinity.

关键词： Synthesis Triazolo-thiadiazoles Electrochemical properties

ARobust Riemann Solver for Multiple Hydro-Elastoplastic Solid Mediums

在线全文

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2020年第1期12卷 212-250页

作者： ruo Li Yanli Wang Chengbao yao HEDPS&CAPT LMAM&School of Mathematical SciencesPeking UniversityBeijingChina College of Engineering Peking UniversityBeijingChina School of Mathematical Sciences Peking UniversityBeijingChina and Northwest Institute of Nuclear TechnologyXi’anShaanxi 710024China

We propose a robust approximate solver for the hydro-elastoplastic solid material,a general constitutive law extensively applied in explosion and high speed impact dynamics,and provide a natural transformation between the fluid and solid in the case of phase *** hydrostatic components of the solid is described by a family of general Mie-Gruneisen equation of state(EOS),while the deviatoric component includes the elastic phase,linearly hardened plastic phase and fluid *** approximate solver provides the interface stress and normal velocity by an iterative *** well-posedness and convergence of our solver are proved with mild assumptions on the equations of *** proposed solver is applied in computing the numerical flux at the phase interface for our compressible multi-medium flow simulation on Eulerian *** numerical examples,including Riemann problems,shock-bubble interactions,implosions and high speed impact applications,are presented to validate the approximate solver.

关键词： Riemann solver Mie-Gruneisen hydro-elastoplastic solid multi-medium flow