空间阻碍

关于空间阻碍在Stephen反应中所起的作用及一些芳香醛的合成

The effect of steric hindrance in the Stephen reaction and the syntheses of some substituted benzaldehydes

但N-甲基壳聚糖例外，其Tg略高于壳聚糖，空间阻碍在这里起决定的作用。

But N , methyl chitosan is an exception , its Tg is slightly higher than chitosan because of the steric hindrance of side group .

BMAT的烯两基起到空间阻碍的作用。

Allyl of BMAT played a role in the inhibition effect by the steric hindrances .

能生成相对稳定的正碳离子和离去基团的反应物容易发生SN1，中心碳原子空间阻碍小的反应物容易发生SN2。

Can generate is relatively stable carbon-left groups and the response of vulnerable SN1 , central carbon atom space hampered the response of small-prone SN2 .

表明非链相互作用可克服空间阻碍导致有序结构形成。

Thus the non-bonding interaction between chromophores may induce th formation of ordered structure .

由于染料分子较低的氧化还原电位，复杂的结构和空间阻碍使得还原断键反应成为偶氮染料整个矿化过程的限速步骤。

The cleavage of the azo bond is the limited step of the mineralization processes because of the low oxidation-reduction potentials and complex structure .

这和凝胶型离子交挟树脂的反应特征是相似的，是交联网络空间阻碍的结果。

The reaction characteristics is exactly the same as a crosslinked ion exchange resin , whose space hindrance of the crosslinked network effects the rate of exchanging .

另一种顾虑是使用UPP及类似方法可能给了反托拉斯者太多空间去阻碍本可能造福消费者的合并。

Another fear is that the use of UPP and the like will give trust busters too much leeway to block mergers that might benefit consumers .

他说，干涉电视节目的制作会限制制作人的创作空间，阻碍行业的发展。

Interference with TV program production will limit the creative space of producers and hinder the industry 's development , ' he said .

纤维丛全空间的Wall阻碍

Wall obstruction of the total space of a fiber bundle

在航天活动中，空间辐射环境是阻碍航天活动成功的至关重要因素，尤其在载人航天方面。

During space activities , space radiation is a vital aspect of hazards , especially in manned space-flight .

村村像城镇、镇镇像农村的地域空间组织形式已阻碍了城市郊区地带的经济社会发展，已影响了当地产业结构的转型升级和民生环境的改善提升。

The area space layout with " each village looks like a town , and each town looks like a village " has been hampering the economic and social development of the suburbs , and has affected the industrial structure upgrading and living condition improvement .

通过对上海城市空间结构、环境状况的分析，针对上海的世界级城市战略，指出空间结构失衡是阻碍上海发展的重要因素。

With an analysis of Shanghai spatial structure and environment conditions , this paper points out that the unbalanced spatial structure is the biggest hindrance in shanghai development .

文章从补偿和政府职能目标对改制的利益空间产生影响这一角度，来分析民营化的障碍，指出补偿要求和多重政府职能会影响改制的利益空间，从而阻碍了国企民营化的顺利推进。

This paper analyzes the obstacle of privatization and points out that compensation and multiple government targets negatively influence the benefit space , which in turn obstructs the privatization .