球Couette流的数值模拟

该文利用谱方法对同心旋转球间轴对称Couette流进行数值模拟.给出Navier Stokes方程的流函数涡度形式,利用Stokes流把边界条件齐次化, 选取Stokes算子的特征函数做为逼近子空间的基函数,对同心旋转球间轴对称Couette流进行谱逼近     

Existence and multiplicity of nontrivial solutions for an elliptic equation on ℝ<Superscript><Emphasis Type="Italic">N</Emphasis></Superscript> with indefinite linear part

 Via the Linking Theorem and Pseudo-index theory, we consider the existence and multiplicity of nontrivial solutions for a class of elliptic problems in all of ℝ ^N with indefinite linear part involving resonance and non-resonance at any eigenvalue. Received: 9 September 2002 / Revised version: 14 February 2003 Published online: 24 April 2003 Mathematics Subject Classification (2000): 35J20, 35J70     

实验教学中的计算机仿真系统

阐述了实验教学中计算机仿真系统的基本内容、结构、特点、实现原理及其推广应用价值     

Existence of the non-radially symmetric ground state for p-Laplacian equations involving Choquard type

We consider some p-Laplacian type equations with sum of nonlocal term and subcritical nonlinearities. We prove the existence of the ground states, which are positive. Because of including p=2, these results extend the results of Li, Ma and Zhang [Nonlinear Analysis: Real World Application 45(2019) 1-25]. When p=2, N=3, by a variant variational identity and a constraint set, we can prove the existence of a non-radially symmetric solution. Moreover, this solution u(x₁, x₂, x₃) is radially symmetric with respect to (x₁, x₂) and odd with respect to x₃.     

Fabrication and Fluorescence Study of Sensitizing Dye/TiO_2 Films

Apromisingapproachusingthehydrolysisoftitaniumalkoxideinethanolicsolutionforthepreparationoftitaniumdioxide(TiO,)atroomtemperaturehasbeengivenmuchattelltionl,2.HerewedescribethefabricationandcharacterizationofbilayerusingcolloidalTiO,filmdye-sensitizedwithasymmetTicallysubstitutedtram4-(2,4-his-tert-amylphenoxy)]-(8-quinoIinolyl)copperphthalocyanineor(Cl,H,5),-N-@H=CH-the-CH,-CH,-COO-whicharedenotedasdyeaanddyebrespectively.Thebilayer,composedofthesize-fixedTiO,ultrafineparticles(UFP)…     

微波消解-FAAS测定蒺藜及含蒺藜蒙成药中钾

微波消解-FAAS法测定蒺藜及含蒺藜蒙成药中钾。实验结果表明,微波消解方法简便、快捷,测试具有良好的精密度和准确度。     

PDP用BaMgAl10O17：Eu蓝粉的表面包覆研究

采用硅酸钠水解法对BaMgAl10O17∶Eu^2＋（BAM）蓝粉进行了表面包覆,通过XRD,TEM和AES等分析手段对包膜荧光粉物相、微观形貌及表面元素进行分析。研究结果表明,BAM蓝粉表面包覆了一层厚薄均匀、表面光滑且致密度高的硅氧化合物无机膜,膜厚约为16-20 nm。BAM蓝粉经包覆处理后,抗热劣化性能得以显著提高,在600℃煅烧1 h后,包膜BAM蓝粉的发光亮度和色坐标分别为91%和0.0609,明显优于未包膜蓝粉的75%和0.0633。     

A REVIEW OF OXYGEN-CONTAINING SURFACE GROUPS AND SURFACE MODIFICATION OF ACTIVATED CARBON

This review focused on the recent reports related to the function, characterization and modification of axygen-containing surface groups of activated carbon (AC). The Oxygen-containing surface groups were briefly described, and the most frequently used techniques for characterization of the oxygen-containing surface groups on .ACs were also briefly stated .4 detailed discussion of the effects of the oxygen-containing snrface groups on the adsorptive capacity of .4C was given. The recent progresses in modification of the oxygen-containing surface groups of AC were also reviewed     

THE EFFECT OF IONIC STRENGTH ON THE UPTAKE OF TAURINE ON A STRONG-BASIC ANION EXCHANGE RESIN

1. INTRODUCTION Taurine (NH2CH2CH2SO3H) is one of the most important amino acids in the human body, and plays an important role in a variety of physiological functions, pharmacological actions and pathological conditions, such as in controlling epilepsy, hypertension and arrhythmia. It is also often used to recover osmotic pressure and promote cerebrum growth [1,2]. As one of amino acids, taurine had the amphoteric characteristic which can be utilized in the ion-exchange technique to e…     

A New Quaternary Ammonium Heteropolyoxotungstate Catalyst for Propylene Epoxidation to Propylene Oxide

A new quaternary ammonium heteropolyoxotungstant (cat.C) is prepared and characterized. And the cat.C also is an reaction-controlled phase-transfer catalyst. The catalytic system of O2/EAHQ (2-ethylanthrahydroquinone)/cat.c is used for the epoxidation of propylene. Under the optimal conditions, the yield of propylene oxide based on EAHQ is 84.1%, theselectivity for propylene oxide based on propylene is 99.8% and the conversion of propylene based on EAHQ is 84.3%. The cat.c precipitates after the epoxidation reaction for easy separation. The cat. C is stable enough to be recycled three times without any loss in selectivity.