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1)  ultra-low density
超低密度
1.
According to the actual problems existed in two-stage cementing operations in low pressure leaking formations of low permeability gas field,using blast furnace slag(BFS),floating beads and combining advantages of universal (drilling) fluid (UF) cementing technique,slag cement slurry with ultra-low density of 1.
本文针对陕甘宁盆地中部低渗透天然气田低压易漏地层二级固井中存在的问题,利用高炉矿渣、漂珠的潜在活性及比重较小的特点,结合多功能钻井液固井技术的优点,用多功能钻井液设计超低密度(120g/cm3~140g/cm3)矿渣水泥浆。
2.
From 1999 to 2002,by combining plot experiments with field demonstration and apllying the research of controling multiple points and multiple factors(sowing time and sowing density),the results show that,if hybrid-rape is early sown with the effective cultivation of ultra-low density,the net profit is 328 715 yuan/hm~2 more than it is late sown with the cultivation of ultra-high density.
通过1999年-2002年田间小区试验与大田示范相结合,并采用多点和多因子(播期、密度)控制研究,试验与示范结果表明:杂交油菜采取早播超低密度高效栽培法比对照超高密度迟播法纯利润多328 715元/hm~2,增值率为708。
3.
A comparative study of sampling media for ultra-low density geochemical investigation was conducted in Jiayin area, a typical forest-swamp landscape area in central Heilongjiang.
黑龙江省中部的嘉荫地区为典型的森林沼泽景观,在该区进行了超低密度地球化学调查采样介质对比研究。
2)  wide-spaced
超低密度
1.
In order to quickly get an overview of the mineral potential of the entire eastern Tianshan terrain, a large wide-spaced geochemical survey project was commenced in 1999 in area of .
超低密度地球化学方法经过近10年发展,已经显示它不受地表覆盖物影响,能够快速有效地圈定战略靶区。
2.
In response to the performance of the Global Goochomical Sampling (a subproject of the IGCP Project 259, International Geochemical Mapping), an orientation study was conducted in 1989-1990 to develop an optimum wide-spaced geoehemical sampling approach in Jiangxi Province, Southsart China.
为了响应国际地球化学旗图计划(ICCP259)中的全球地球化学采样子计划的实施,研制超低密度地球化学采样的最佳方法,1989~1990年在江西省开展了一项试点研究。
3)  ultra-low density cement slurry
超低密度水泥浆
1.
An ultra-low density cement slurry design principle is given in this paper.
为此,引入了超低密度水泥浆的概念;分析了所使用的减轻材料选择依据,提出超低密度水泥浆设计原理,超低密度水泥浆密度可达0。
4)  ultralow density foam
超低密度泡沫
5)  ultralow density materials
超低密度材料
6)  Ultra-lightweight cement
超低密度水泥
补充资料:超低密度聚乙烯
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性质:共聚单体含量高于20%的乙烯共聚物。密度0.87~0.90g/cm3者称超低密度聚乙烯。密度0.90~0.915g/cm3者称甚低密度聚乙烯(VLDPE)。结晶性低,其柔韧性、低模量、撕裂强度、耐穿刺性优于线性低密度聚乙烯,相当于醋酸乙烯含量4%~8%的乙烯-醋酸乙烯共聚物。但熔点和热变形温度比后者高,对聚乙烯和聚丙烯有极好的粘接性,密度0.90g/cm3。熔体指数0.8g/10min时,其拉伸强度30MPa,伸长率850%,弯曲弹性模量65MPa,拉伸冲击强度10.5J/m,熔点115℃,脆化温度<-75℃,耐环境应力开裂>2000h。采用低压气相法,溶液法、高压法由乙烯与α-烯烃共聚而成。用作代替乙烯-醋酸乙烯共聚物、软聚氯乙烯和某些弹性体用。用作食品及医药包装薄膜、容器衬里、地膜。

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