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Addition Reactions of Sulfenyl and Sulfinyl Chlorides with 3‐Phenyl‐1‐azabicyclo[1.1.0]butane

The reactions of 3‐phenyl‐1‐azabicyclo[1.1.0]butane with α‐chlorosulfenyl chlorides and sulfinyl chlorides lead to the corresponding sulfenamides and sulfinamides, respectively, which possess an azetidine ring. It is proposed that a two‐step mechanism occurs involving an intermediate carbenium ion, which is formed by the addition of the electrophile at the N‐atom and cleavage of the N(1)? C(3) bond. The structures of 9b and 10b are established by X‐ray crystallography.     

基于毫米波辐射特性的水面植被检测方法

针对采用3mm波段辐射计对水面植被辐射特性进行检测的问题,在研究分析了水面的亮度温度和水面植被的介电特性的基础上,采用相干法建立了水面植被辐射特性的多层介质模型,与3层介质模型相比,仿真结果与实验数据更加吻合,表明多层介质模型能更精确地模拟水面植被的辐射特性。通过实验得出,在不同的入射角下,水面植被亮温相比水面亮温均有上升,说明水面相比植被具有亮温低、冷目标的毫米波辐射特征,可利用毫米波辐射特性监测区域内水面植被。     

Synthesis and structure of novel copper(II) complexes with pyrazole derived ligands and metal–ligand interaction in solution

Two new ligands of the coumarin type have been synthesized and characterized by ¹H, ¹³C NMR, IR and MS. The crystal and molecular structures of ligand 2, determined by the X-ray diffraction method, are presented. With copper(II) these ligands create solid complexes of the type CuLCl₂, where L is 5-(2-hydroxybenzoyl)-3-methyl-1-(2-pyridinyl)pyrazol-4-carboxylic acid methyl ester (2) or 3-methyl-1-(2-pyridinyl)-1H-chromene[4,3-c]pyrazol-4-on (3). The new copper(II) complexes have been characterized by elemental analysis and solid state FT-IR. The protonation constants of ligands 2 and 3 have been determined in 5% v/v 1,4-dioxane–water solution (25 °C). The coordination modes in the complexes with copper(II) are discussed for 2 on the basis of potentiometric and UV–Vis data.     

Time-of-flight studies of emission of μt from frozen hydrogen films

In recent TRIUMF experiments, a μ^- beam is stopped in a solid hydrogen film with a small fraction of T₂. The Ramsauer-Townsend (RT) mechanism allows μt to escape into vacuum with a few eV of energy. To study the emission process, an imaging system was used to determine the position of muon decays. Experimental histograms are in good agreement with a Monte Carlo simulation. This revised version was published online in August 2006 with corrections to the Cover Date.     

Note on the Stability of a Slowly Rotating Timoshenko Beam with Damping

This paper continues the senior author's previous investigation of the slowly rotating Timoshenko beam in a horizontal plane whose movement is controlled by the angular acceleration of the disk of the driving motor into which the beam is rigidly clamped. It was shown before that this system preserves the total energy. We consider the problem of stability of the system after introducing a particular type of damping. We show that the energy of only part of the system vanishes. We illustrate obtained solution with the critical case of the infinite value of the damping coefficient.     

Elastic shallow shells with functionally graded structure

Main objects of considerations are linear-elastic thin shallow shells with a tolerance-periodic structure along one direction. Moreover, their properties along the perpendicular direction can be described by continuous, slowly-varying functions. Hence, these objects can be treated as shells with a functionally graded structure. Here, the tolerance model of these shells is proposed. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)     

非线性奇异三阶微分方程周期边值问题的正解

讨论非线性奇异三阶微分方程的周期边值问题{u″＋ρ^3u=f（t,u）,t∈I=（0,2π）,ρ∈（0,1/√3）是常数 u^（i）（0）=u^（t）（2π）,i=0,1,2 的正解存在性问题．通过与一个线性算子相关的第一特征值的讨论,运用不动点指数定理,得到了正解存在的结果．