Phytochemical Constituents,Attenuated Total Reflectance Fourier Transform Infrared Analysis and Antimicrobial Activity of Four Plant Leaves Used for Preparing Rice Beer in Assam,India

Phytochemicals content and antimicrobial activity of Artocarpus heterophyllus, Cyclosorus extensa, Oldendia corymbosa, and Alpinia malaccensis were investigated. Maximum alkaloids and terpenoids were found in A. heterophyllus; tannins and saponins in C. extensa; flavonoids, polyphenols, and phytosterols in O. corymbosa and anthraquinone, glycosides, and anthocyaninin A. malaccensis. Aqueous, methanolic, ethyl acetate, and hexane extracts were prepared from all the leaves. Attenuated total reflectance Fourier transform infrared spectrophotometric (ATR-FTIR) analysis revealed that alkanes and alkyl halides were prevalent in all the extracts and the ethyl acetate extracts contained comparatively higher number of functional groups, which were also more effective against Candida albicans, Escherichia coli, and Staphylococcus aureus. The minimum inhibitory concentration values of A. malaccensis against the tested pathogens were found to be lesser than the other species.     

常见电气二次控制原理图设计思路

结合工程案例图．对常见的电气二次控制原理图的基本设计思路、易被忽视的细节问题,以及常见控制电器二次图的设计特点、常用备用相互切换互锁原理进行说明。     

新型矿用隔爆双回路真空磁力起动器的应用

本文在介绍双回路真空磁力起动器主要用途基础上,重点阐述了研究内容、工作原理与技术特点,对中、小煤矿的井下水泵和自吸水泵的推广应用提供了安全生产的有效途径。     

LOGO!在矿用电磁起动器中的应用

由于煤矿井下条件恶劣 ,多数矿井含有瓦斯气体 ,容易引起爆炸。所以 ,对矿用电磁起动器的要求十分严格 ,这就极大地限制了它的推广使用。介绍一种新型器件LOGO !(Siemens公司生产的通用逻辑控制模块 ) ,在矿用电磁起动器中的应用。     

矿用智能真空磁力启动器的研究

对真空磁力启动器的现状进行全面分析 ,介绍了基于 80C196KC单片机的智能型真空磁力启动器的各种功能及实现原理 ,而后给出了相应的硬件和软件设计以及抗干扰措施     

一种小型防爆起动器

针对目前煤矿中的电动机违章操作的问题，设计了一种小型防爆起动器，介绍了共工作 原理及结构，电气设计。     

矿用隔爆型电磁启动器用电子保护器选型

对目前煤矿井下使用的3种电动机综合保护装置进行了比较，并提出了最佳选型。     

QJZ-4×60/660C型真空电磁起动器实现双风机双电源的探讨

使用QJZ-4×60/660C型矿真空电磁起动器,可实现2台轴流式风机自动切换控制,对掘进工作面不间断通风和风电、瓦斯电闭锁。     

磁流变液软启动器原理探讨

本文论述了磁流变液的特性,利用磁流变液屈服应力的Bingham塑性模型,分析了用磁流变液实现电动机软启动的原理。