排序方式: 共有35条查询结果,搜索用时 15 毫秒
11.
12.
介绍清洁生产的概念及其产生的背景。针对江汉石油管理局的现状,提出了实施清洁生产的几点设想,以期尽快将清洁生产付诸实施的同时带来经济效益和环境效益。 相似文献
13.
14.
A new procedure of determining optimal C/N (the rate of carbon source to nitrogen source) of mixed distillers‘ grains for combined bacteria synergic fermentation is established.At the same time an improved method evaluating bacteria growth,called method of dry cell weighing by filtering is developed.For each combination of C and N,their initial and residual contents before and after fermentation respectively are determined.Then followed the calculation of utilization of C and N sources by the compound bacteria.The optimal C/N is finally located from among the utilization of C and N of several combinations and the weight of produced mass of oven-dried thallus.The conditions of fermentation are:inoculum size 10%,temperature 30.0℃,rotational speed 170 r/min,shake culture time 48h.The best results obtained from orthogonal experiments are:maximum mass of oven dried thallus is 14.693g in a liter liquid medium,maximum utilization rate of carbon source is 98.13% and maximum utilization rate of nitrogen is 78.14%.Optimal C/N is 5.1。 相似文献
15.
16.
17.
18.
将每天TSP、SO_2两种污染物各采四次样并分别进行测定,简化为每天各采一个“日混合样”进行测定,对测定结果进行数理统计检验结果表明:测定值之间不存在显著性差异、两种方法的测值波动是由偶然因素造成的,因此,简化方法即采日混合样进行分析是一种可靠的监测方法,它适用于煤质中含硫份较低的地区。 相似文献
19.
应用数理统计中抽样理论,对瑞安市环境噪声监测点进行了优化组合,方法简单易行,兼顾了功能区特征,减少了测点数,并能达到要求的准确性。 相似文献
20.