以高产量、高产率、高生产强度为目标的发酵过程优化技术

以高产量、高底物转化率和高生产强度为目标,综合运用微生物反应计量学、生化反应和传递动力学、生物反应器工程及代谢工程理论,开发了:(1)基于微生物反应计量学的培养环境优化技术;(2)基于微生物代谢特性的分阶段培养技术;(3)基于反应动力学模型的优化技术;(4)基于代谢通量分析的优化技术;(5)基于系统观点的生物反应系统优化技术。将这些技术广泛应用于多种产品的发酵过程优化研究中并取得了成功。在此基础上总结出“简化、定量化、模型化和阶段化”的发酵过程优化基本原理,这一基本原理对提高我国发酵工业技术水平、促进生物食品产业的健康发展将起重要作用。

首钢高强度机械制造用钢生产线简介

介绍了首钢新建高强度机械制造用钢生产线的基本情况,分析了该生产线的工艺和设备特点,并根据该生产线投产以来的实际情况,对生产线的优势和存在问题进行了总结。

三峡二期工程左厂#11～#14坝段的温控技术

三峡工程质量控制至关重要.由于顶带机、平仓机等一批高强度现代化设备的使用,已使三峡工程的混凝土日产量和年产量连续刷新世界记录,而大体积、高强度的混凝土生产使得温控防裂工作更加重要、突出.为了做好三峡工程的温度控制,我们主要从以下6个方面入手:(1)优化设计配合比,控制混凝土水化热;(2)拌和制冷,控制出机口温度;(3)遮阳、覆盖与仓面喷雾,调节环境温度,控制温升;(4)混凝土通水冷却,削减其内部水化热;(5)混凝土表面养护与保温,防止裂缝产生;(6)科学施工组织,是实施温控极其重要的环节.实践证明,三峡二期工程左厂#11～#14坝段的温控效果良好.

Research on the mechanical property test of a new high-strength metal bolt

In order to study how to improve the overall performance of the operational metal bolt, based on the production process of an ordinary metal bolt used in understructure engineering, this paper focused on the existing problems of ordinary metal bolts identified by some survey and analysis. The results show that the structure of operational metal bolts is so unrea- sonable that the bolt tail is easily fractured by low load capacity. Furthermore, a new type of strong big-end metal bolt and its heat treatment and roughing processing technology were introduced. Through bolt tensile and metallographic tests, the property of the new big-end bolt was analyzed. The new findings indicate that after a special processing, the overall strength and plasticity of the bolt is greatly improved, and the grain of the bolt tail structure is refined, which would help build up favorable working conditions for bolt tails.