专门用于各种手工和计算机化的文献情报 存储检索系统,表达文献主题概念和检索课题 概念的人工语言

一、发展阶段: (1)脱机检索阶段 (2)联机检索阶段 (3)国际联机检索阶段 (4)个人计算机发展 (5)通信网络飞速发展

一、基本概念 情报 情报检索 情报检索类型 接着来 二、科技文献的概念和特点

一、信息检索、文献检索与数据检索 二、二科技文献及其主要类型 三、索引与索引法 四、容四文献检索工具

THE TWO BASIC INVESTMENT CONCERNS PROFITABILITY (HOW MUCH MONEY WILL I MAKE?) risK (WHAT ARE MY CHANCES OF MAKING IT?)

DESIGN METHODOLOGY goaL-- Produce design for chemical plant that: Is economically acceptable and Is operable,ie., eIs safe → Is controllable Is reliable,and Is environmentally acceptable

DESIGN METHODOLOGY: INPUT-OUTPUT DECISIONS goaL-- Choose the process chemistry and feedstock most appropriate to the plant to be designed and determine the associated economic potential

DESIGN METHODOLOGY III: RECYCLE STRUCTURE OF THE PROCESS goAL-- Determine alternate recycle structures for the process based on reactor operating requirements

.Unsteady, aperiodic motion in which all three velocity components fluctuate→ mixing matter, momentum, and energy. Decompose velocity into mean and fluctuating parts:

DESIGN METHODOLOGY: CHOICE OF PROCESS TYPE goaL-- Choose the process type appropriate to the plant to be designed