permafrost是什么意思

用法例句

The Qinghai-Tibet Plateau has harsh natural conditions and on it the largest permafrost region in China is distributed and Meso-Cenozoic marine strata and marine and terrestrial basins are well devel-oped,which provides advantageous conditions for forming natural gas hydrate accumulations on the plateau.

青藏高原分布着中国规模最大的多年冻土带,发育有良好的中、新生代海相地层及海相、陆相盆地,为高原天然气水合物矿藏的形成创造了有利条件。

Research Summarization on Natural Gas Hydrate in Permafrost Regions;

多年冻土区天然气水合物研究综述

Relationship between permafrost and gas hydrates on Qinghai-Tibet Plateau.;

青藏高原天然气水合物的形成与多年冻土的关系

Comparative Analysis on Ecological Conditions of Qinghai—Tibet Plateau Permafrost Areas and Tianshan Mountain Permafrost Areas;

青藏高原与天山山地多年冻土地区生态环境状况的比较分析——以青藏公路格拉段与天山公路独库段为例

The variations of nitrogen and phosphorus transportation in the last decades were studied and their relationships with population,applied fertilizers and wastewater discharged in the basin were analyzed.

收集了黄河流域下游主要干流监测站近40a来(氮数据)或20a(磷数据)来的水质数据,同时,收集了流域各省人口、氮肥磷肥施用量(折纯)及工业废水排放量等数据,研究了黄河氮磷营养盐通量(或浓度)的多年变化趋势,并统计了水质变化与流域人口、化肥用量和工业废水排放量等社会经济指标的关系。

The Hydrographic data from three major CHINARE cruises and one Australian cruise along 73°E near Prydz Bay are interpreted to present the features and variations of water masses and geostrophic currents.

根据 2 0 0 2 ,2 0 0 0和 1999年中国南极考察和 1992年澳大利亚南极考察资料 ,分析了普里兹湾 73°E断面水团与地转流的结构及其多年变化 :(1)该断面上水团主要有南极表层水、绕极深层水、南极底层水和陆架水 ;(2 )南极表层水 1999,2 0 0 0年向北扩展最强 ,2 0 0 2年向北扩展最弱 ,绕极深层水 2 0 0 2年向南扩展也较强 ,1999和 1992年绕极深层水向南扩展较弱 ,南极底层水 ,位温在 - 0 。

Underground water types and the reated regulation in perennial frozen soil environment in Holapen Basin;

霍拉盆盆地多年冻土环境中地下水类型及赋存规律

Most areas along the Qinghai-Tibet Railway are of perennial frozen soil.

青藏铁路的大部分区域由多年冻土组成,冻土顶层或活动层特别容易受季节冻融的影响。

Distributing of perennial frozen earth area and its bridge and culvert engineering;

浅谈多年冻土地区的分布及其桥涵工程

This article analyzed the reason why the road built in the perennial frozen earth is destroyed.

分析了在多年冻土地带修筑的铁 (公 )路路基被破坏的原因 ,提出了对路基采取保温的防治措施 ,介绍了路基保温的机理及硬质聚氨酯泡沫塑料在路基上的施工工

Considering the bad natural condition of Qinghai-Tibet Plateau and the special engineering character of perennial frozen earth ,the author carried out some research on getting temperature index,laws during concrete construction through calorific calculating,which will guide the concrete construction in perennial frozen earth area of Qinghai-Tibet Plateau and other chilly area as well.

针对青藏高原腹地多年冻土区恶劣自然环境和多年冻土独特工程特性条件下桥梁施工对混凝土提出的技术要求 ,通过热工计算 ,推导混凝土施工过程中各阶段的温度控制指标、措施和一些规律 ,对青藏铁路多年冻土区桥梁混凝土施工及其它严寒地区混凝土施工具有指导意义。