Two-stream counter-flow heat exchanger equation with time-varying velocities

We study the two-stream counter-flow heat exchanger equation with time-varying fluid velocities. Formulating it into a time-varying boundary control system, a representation formula of the solution is obtained.     

In situ deposition of Pd nanoparticles on carbon paper and their electroactivity for ethanol oxidation

Ionics - In this work, Pd and PdNi nanostructured particles have been deposited on the carbon paper (CP) by a novel and simple method of in situ deposition. The prepared catalysts were named as...     

Cesium-catalyzed highly regioselective synthesis of (Z)-vinylic selenosulfides via thioselenation of alkynes with unsymmetrical diorganoyl dichalcogenides

A novel one-pot approach for the synthesis of (Z)-vinylic selenosulfides is demonstrated through the thioselenation of a wide range of alkynes with unsymmetrical diorganoyl dichalcogenides (RSSePh) catalyzed by cesium hydroxide monohydrate, avoiding the use of the transition metal catalyst and the previous preparation of chalcogen alkynes. Other outstanding features include mild reaction conditions, high regio- and stereo-selectivity, excellent yields and wide functional group tolerance.     

Synthesis of Novel 4ʹ-Hydroxy-2ʹ,3-diaryl-3,4,4ʹ,5ʹ-tetrahydro-2H,2ʹH,6H-spiro[thiazolo[3,2-a][1,3,5]triazine-7,3ʹ-thiophen]-6-one Derivatives via Sulfa-Michael/Aldol Cascade Reactions

Russian Journal of General Chemistry - The sulfa-Michael/aldol cascade reaction of (Z)-7-arylidene -3-aryl-3,4-dihydro-2H-thiazolo[3,2-a][1,3,5]triazin-6(7H)-one with 1,4-dithiane-2,5-diol leads to...     

Input-to-state stability of impulsive systems and their networks

This paper considers input-to-state stability (ISS) characterization for a class of impulsive systems which jump map depends on time. We provide sufficient conditions in terms of exponential ISS-Lyapunov functions equipped with an appropriate dwell-time condition for establishing ISS property. Some modifications of dwell times which are more conservative, but easy to be verified are being introduced. We also show that impulsive system with multiple jump maps can naturally represent an interconnection of several impulsive systems with different impulse time sequences. Then we present a procedure to verify ISS of such networks.     

时滞影响下受控斜拉索的参数振动稳定性

研究了轴向激励作用下受控斜拉索系统主参数共振的时滞效应,考虑了拉索垂度和几何非线性的影响,基于Hamilton变分原理建立了受控斜拉索系统轴向激励下的非线性参数振动方程,利用Galerkin方法得到时滞动力系统,运用多尺度法对受控系统的主参数共振进行了分析,得到了不同时滞值、控制增益时参数振动稳定域和受控拉索的时程曲线.研究表明,时滞影响下斜拉索振动控制系统的效果变差,参数共振的稳定域发生偏移,对受控斜拉索系统的控制效果随着时滞的增大而变差,从而对控制系统的参数设计起到指导作用.