1) unsupported roof distance
空顶距
1.
To study the stability of surrounding rock in coal entries,rational unsupported roof distance was obtained ty thin plate theory;which supplied the theoritical base for the surrounding rock control in Daning mine,helped to raise exacavation efficiency and insure safe production.
为了进一步研究全煤巷大断面围岩的稳定性 ,针对大宁矿在掘巷道的情况 ,采用薄板理论分析 ,确定了其巷道掘进的合理空顶距 ,为大宁煤矿煤巷围岩控制提供了理论依据 ;有利于大宁矿进一步发挥掘巷机械的效率 ,保证了安全生
2) zenith distance
顶距
1.
just by pressing a button without the sea horizon to turn to,we should know clearly the relationship between the accuracy of zenith distance observed and the accuracy of a position fixed,the causes of the errors of zenith distance observed,what accuracy of zenith distance observed could be obtained and what accuracy standard should be used.
要在无水天线测天时一按按钮就可定出较精确的船位经纬度,必须弄清天体顶距测量精度对定位精度的影响,弄清顶距测量误差产生的原因,可达到的精度及选用适当的精度标准。
2.
The paper expounds the principle and the method of measuring zenith distance for celestial positioning based on the direction of gravitational force line.
论述了在海上进行天文定位时以重力线作基准直接测定天体顶距的原理和方法。
3) apex distance
顶距
1.
The pipe driving construction method characteristics,pipe material choice,pipe driving force calculation and apex distance determination,working pit and receiving pit selection and size determination were analyzed.
对顶管施工方法工艺的特点、管材选择、顶力计算和顶距确定、工作坑和接收坑选用及尺寸确定等方面进行了分析,并提出了顶管法施工应注意的一些事项,以推广顶管技术的应用。
4) Headspace
[英]['hedspeis] [美]['hɛd,spes]
顶空
1.
AutoHS Automatic Headspace Sampler and Its Applications;
AutoHS自动顶空进样器及其应用
2.
Comparison of Static Headspace and Headspace-SPME-GC-MS Methods for Tobacco Flavors Analysis;
静态顶空与顶空-SPME-气质联用法在烟用香料分析中的比较
3.
Determination of Halohydrocarbons and Benzoid Compounds in Paints by Headspace Gas Chromatography-Mass Spectrometry;
顶空进样气质联用法测定涂料中12种卤代烃和苯系物
5) unsupported roof span
控顶距
1.
On the basis of some actual projects,such parameters as wall-rock loose loops and unsupported roof span are provided for Qianling Iron Mine,which can be used as reference and guide for similar projects.
结合工程实际,提出了前岭铁矿的围岩松动圈、掘进控顶距等参数,为类似工程提供借鉴和指导。
6) Forced roof cavingSpan
放顶距
补充资料：顶空分析法(headspace analysis)
分子式：
CAS号：
性质：又称顶空分析法(headspace analysis)。顶端空间的取样方法和气相色谱分析相结合的联用技术。将液体或固体试样置于有一定空间的密闭系统中，待达到热力学平衡后，取其顶端气相组分进行色谱分析。是间接测定试样中挥发性组分的一种方法。
CAS号：
性质：又称顶空分析法(headspace analysis)。顶端空间的取样方法和气相色谱分析相结合的联用技术。将液体或固体试样置于有一定空间的密闭系统中，待达到热力学平衡后，取其顶端气相组分进行色谱分析。是间接测定试样中挥发性组分的一种方法。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条