查询词典 sampling fraction

The CPP was separated into five fractions using fractional precipitations by solvent/nonsolvent technique. Densities for binary mixtures of five fractionated and unfractionated CPP which contains a mass fraction of 30 % chlorine with solvents were determined. At a fixed temperature, concentration and solvent, the densities for binary mixtures of fractionated and unfractionated CPP with solvents have the same value.

用沉淀分级方法对氯含量为30％的氯化聚丙烯进行分级，得到5种窄分子量的级分，测定了氯化聚丙烯的不同级分与不同溶剂组成的二元混合物溶液的密度，在溶剂一定、浓度一定、温度一定时，不同级分氯化聚丙烯溶液的密度是相同的，不受分子量及其分布的影响。

Besides, the stable high octane number gasoline fraction can be obtained from the thermal-catalytic cracking of PS.

研究还表明，PS通过热解-催化可得到比较稳定的高辛烷值汽油组份。

The aim of this work is to obtain styrene monomer and high octane number gasoline fraction from polystyrene by thermal and thermal-catalytic treatment respectively.

本文的目的是用热解和热解-催化两种方法由聚苯乙烯制取苯乙烯单体和汽油组份。

These electron beams may only be a small fraction as powerful as those produced by the Large Hadron Collider , but they produce plenty of radio waves that the research team detected after seeing flickering, oddly-shaped lightning bolts called sprites.

跟大型强子对撞机所产生电子束相比，这些电子束的威力可能是微乎其微的。但是，研究小组看到被称为"鬼怪"的雷电奇形怪状地闪现出来之后，他们发现这些电子束产生了大量的无线电波。

With the increase of onium salt initiator, the enhanced extent of gel fraction induced by co-initiator will decrease.

随着碘锚盐引发剂含量的增加，共引发剂对体系凝胶含量的提高幅度减小。

Ordinate, the fraction of cells in mitosis.

纵坐标，有丝分裂细胞比例。

The constituents were extracted by some solvents. 18 constituents were isolated from Chloroform fraction by different chromatography. 15 constituents were identified by IR ,MS and NMR as follows: 3-sitosterol, P-sitosterylpalm itate,succinate acids, 1, 4-benzenediol, 1, 2-benzenediol, p-hydroxybenzaldehyde, syringaresinol, oleanolic acid, usolic acid, ethyl caffeate , Rosmarinic acid ethylster and etc. In such constituents ,nine compounds were isolated for first time from Origanum vulgare L..

牛至药材经水煮醇沉法所得浸膏，利用溶剂法和色谱法从中分离得到18个单体成分，通过IR、MS、NMR等波谱技术鉴定了其中的15个化合物，分别为β-谷甾醇(1)、β-胡萝卜苷(2)、琥珀酸(3)、对-二苯酚(4)、邻-二苯酚(5)、对羟基苯甲醛(6)、1.2-二羟基-4-异丙基-5-甲基苯(7)、新木脂素(8)、丁香脂素(9)、齐墩果酸(10)、乌苏酸(11)、4-二十六烯(12)、正二十六醇(13)、咖啡酸乙酯(14)、迷迭香酸乙酯(15)等，其中化合物3、4、5、6、7、8、9、14、15等9种化合物均为首次从该属植物中分离得到。

Three global fraction orthogonal polynomials algorithms were reviewed in this paper,and their precision,efficiency and sensitivity to the testing noise were compared.Finally,based on the above comparison,the problems and future research direction of the algorithms were discussed.

本文系统的介绍了整体正交多项式识别算法发展过程中出现的三种方法，同时从识别精度、对噪声敏感程度和识别效率三个方面对方法进行详细的比较和评价，并在此基础上进一步指出了方法存在的问题和未来的研究方向。

The anti-endotoxin mechanism of the active fraction isolated from Radix Isatidis may related to its inhibition to the oversecretion of cytokines induced by LPS.

板蓝根可能通过抑制炎性因子过度释放发挥其杭内毒素作用。

Cu、Ni、Pb and Cd showed more affinity to the oxidizable metal fraction. Bio-availability of all the measured metals, except Cd,decreased with the increase in composting time. Therefore, we conclude that composting could stabilize the heavy metals present in the sludge and decrease the risk of soil pollution.

污泥堆肥中Cu、Ni、Cd、Cr主要以残渣态形式存在，Cu、Ni、Pb、Cd四种重金属元素的可氧化态含量也相对较高，除Cd外，经过堆肥化处理后所有重金属的有效态含量均呈下降趋势，因此，堆肥可以促进污泥中的重金属稳定化，降低土壤的污染风险。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。