排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
2.
发动机曲轴必须经过精确的动平衡校正,这是毫无疑义的。但是,为了达到这一点,必须正确地选择转速。一般地说,转速越高,不平衡质量产生的离心力就越大,因而动平衡灵敏度就越高。所以,刚性转子动平衡校正时,都尽可能选用较高的转速。然而,对于发动机曲轴,尤其是六缸曲轴,却应该具体地分析。曲轴动平衡校正时,动平衡机本身所提供的转速,并不是不加分析地任意采用。其中较高的转速,是不能用来进行 相似文献
3.
In the two-step vitamin C fermentation process, its precursor 2-keto-L-gulonic acid was synthesized from L-sorbose by mixed culture of Gluconobacter oxydans and Bacillus megaterium. The interaction between Gluconobacter oxydans and Bacillus megaterium remains unclear and it is a challenge to mathematically model the mixed growth of these two strains. The Monod-type equations were previously proposed to describe the coupled growth of Gluconobacter oxydans and Bacillus megaterium. However, in this study, we modeled the interaction of these two strains in a macroscopic view by introducing the population theory. Taking account of the fact that the density or concentration of Gluconobacter oxydans or Bacillus megaterium was hardly to measure accurately in the mixed culture broth, the data of concentrations of the substrate and product were used to indirectly investigate the relation between these two strains. Three batch experiments were used to validate our model. And according to the values of identified parameters, the type of interaction between Gluconobacter oxydans and Bacillus megaterium was concluded to be predation, where Gluconobacter oxydans was predator, and Bacillus megaterium was prey. 相似文献
4.
探讨了航海类院校在校学生参加海事局统一理论考试和实操评估涉及到的问题和困难,提出一些改革建议。 相似文献
5.
6.
7.
8.
9.
10.
近日,桂林海事局与相关部门联手展开漓江通航秩序整顿专项行动,对违法违规行为保持高压打击态势,全力遏制漓江“三无”船、“野马”船非法载客现象,查处船舶违章行为,最大限度维护正当经营者的合法利益,使漓江水上交通秩序好转,码头每日开航艘次增加, 相似文献