39000DWT散货船货舱CO_2分级释放控制系统的设计

本文浅析货舱CO_2分级释放控制系统的设计方法,以增强系统实用性。同时,注重控制系统安全性能,确保船上固定式CO_2灭火系统起到应有的保护作用。

催化剂生产厂房内防爆区域如何划分

从释放源分级到爆炸危险区域划分概念分析,通过采取安装精密的易燃易爆气体检测仪表与连锁启动风机、关断易燃易爆气体管道阀门等措施将催化剂厂房降为非防爆区域,通过方案对比提出催化剂生产厂房不执行《石油化工企业设计防火规范》,从而达到即安全又节省工程费用的目的。

Single Machine Scheduling Problem with Release Dates and Two Hierarchical Criteria to Minimize Makespan and Stocking Cost

In this paper, the single machine scheduling problem with release dates and two hierarchical criteria is discussed. The first criterion is to minimize makespan, and the second criterion is to minimize stocking cost. We show that this problem is strongly NP-hard. We also give an O（n^2） time algorithm for the special case that all stocking costs of jobs in unit time are 1.