负载液相催化剂的研究进展

负载液相催化剂是一种新型的“混合型”催化剂,它结合了均相催化高活性、高选择性和多相催化接触面积大、容易分离的优点,有广阔的应用前景。综述了迄今为止关于负载液相催化剂的研究进展,总结了负载液相催化剂的特点及其在许多重要化学反应中的应用。     

用SLPC改进酸碱比值控制

酸碱比值控制是氰化钠生产中关键的控制回路,论述了控制对象的工艺特性和主要扰动因素及其应用SLPC改善比值控制品质的方法.     

煤气熔铝炉控制系统的设计与分析

介绍煤气熔铝炉流量比值控制系统的组成、控制原理及系统比值系数的确定，着重分析SLPC可编程调节器功能及其在控制系统中的应用。生产运行表明，整个系统控制精度高，既可以实现煤气熔铝炉的安全运行，又可以降低能源消耗。     

煤气熔铝炉燃烧控制系统的改进实践

本文主要阐述煤气熔铝炉流量比值控制系统的组成、控制原理、系统比值系数的确定及改进实践，改进后整个系统控制精度高，既实现了煤气熔铝炉的安全运行，又降低了能源消耗。     

轴流风机防喘振分析及基于SLPC的防喘振控制系统设计

在分析轴流风机喘振产生原因和防喘振机理的基础上,运用单回路可编程调节器(SLPC),设计了适用于机后放风、静叶调节和转速调节的防喘振控制系统。控制系统结构简单、功能可靠实用、成本低,得到广泛应用。     

Structure-dependent membrane interaction of flavonoids associated with their bioactivity

Plant foods contain various flavonoids with nutraceutical and health benefits. Structurally different flavonoids were compared by the potency to interact with liposomal membranes in the context of their mode of action. A series of fluorescence polarisation measurements showed that flavonoids (1–10 μM) structure-dependently acted on the deeper regions of lipid bilayers to decrease membrane fluidity. Their comparative effects on cell-mimetic membranes, consisting of unsaturated phospholipids and cholesterol, characterised the structure–membrane interactivity relationship: 3-hydroxylation of the C ring, non-modification of the B ring and 5,7-dihydroxylation of the A ring led to the greatest membrane interactivity, followed by 3′,4′-dihydroxylation of the B ring. Galangin and quercetin, meeting such a structural requirement, inhibited the proliferation of tumour cells at 10–100 μM, together with rigidifying cell membranes, but not membrane-inactive flavonoids. The structure-dependent membrane interaction, which modifies the fluidity, is mechanistically associated with flavonoid bioactivity in a membranous lipid phase.     

SLPC在压缩机防喘振控制系统中的应用

在简要阐述压缩机喘振区域及限制流量防喘振控制算法的基础上,着重介绍了单回路可编程调节器(SLPC)在多级离心式压缩机防喘振控制系统中的应用及其取得的效果。     

In situ XAFS Characterization of Supported Homogeneous Catalysts

Heterogenization of homogeneous catalysts explores the cross-fertilization of homogeneous and heterogeneous catalysts to combine most of their advantages. The molecular dispersion of active sites in these materials limits the application of conventional spectroscopic techniques utilized for the characterization of heterogeneous catalysts. The X-ray absorption spectroscopy is the most suitable tool to characterize the molecular species present in these catalysts because this technique is sensitive to short-range structural orders, element-specific and amenable to in situ studies. X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) studies for selective examples of supported homogeneous catalysts are reviewed. Supported liquid phase catalysts (supported Wacker-type catalysts for CO oxidation), intercalated homogeneous catalysts, supported metal complexes for the olefin polymerization and tethered homogeneous catalysts are included.     

年产40万t重钙装置料浆反应器自动配比控制系统

采用ｙｓ－８０系列的ＳＬＰＣ－２８１Ｅ可编程调节器和ＳＭＲＴ－１４０Ｅ型比率给定器实现重钙装置料浆反应器物料自动配比控制,其控制效果良好。     

SLPC在状态反馈控制系统中的应用

状态反馈控制(SFC)系统是一种先进控制系统．文章主要介绍了SFC系统状态控制器的设计方法．利用SLPC可编程数字调节器进行实施．结果表明．对于SFC系统．只要状态控制器各参数整定恰当,可以得到良好的控制质量．