查询词典 selectivity

Using characters of periodic fading of channel in frequency selectivity, the invented method partitions orthogonal FDM modulation sub carrier wave into some sub bands in two types crossed arranged to be assigned to two typed users.

一种正交频分复用调制子载波分割与子带交叉排列的方法，用于数字信息传输技术领域。

And the hollow fiber membranes have an O2 permeance rate of 6.38 GPU with an O2/N2 selectivity coefficient of 7.13 at 25℃and 0.5MPa.

考察了温度和压力对膜的渗透系数和选择性系数的影响，并考察了物理老化对膜性能的影响。

The results showed that the effect of pH on the selectivity and the current efficiency is the most obvious.

结果表明pH值对选择性和电流效率的影响最大。

Solid at room temperature, phosgene is a solid, relatively stable, even when boiling, only a small amount of decomposition, as a substitute for phosgene, not only low-toxic and easy to use, and the mild reaction conditions, good selectivity and high yield.

固体光气在室温下是固体，比较稳定，即使沸腾时，也仅仅少量的分解，作为光气的替代物，不仅毒性低，使用方便，而且反应条件温和，选择性好，收率高。

That photodetector have both wavelength selectivity and high-speed response making it ideal for wavelength division multiplexing applications.

该光探测器具有较好的波长选择特性，将会成为波分复用光纤通信系统中比较理想接收器件。

This method has high sensitivity and selectivity in photometric determination of micro Zn(superscript 2+) in environmental water samples.

应用于环境水试样中痕量锌离子的分析，结果满意。

To probe into either the attractiveness to or avoidance from phylloxera of grape rootstocks and cultivars with different tolerance, as well as into the volatile components from their roots, the method of invitro root segment culture was used to investigate the selectivity of Phylloxera viticola Fitch to the roots of grape rootstocks '5BB' and '140Ru' and cultivar 'Kyoho'.

为了探讨不同抗性水平砧木及品种对根瘤蚜吸引及驱避效应以及鉴定挥发性物质组分，采用离体根段培养法测定葡萄根瘤蚜Phylloxera viticola Fitch对砧木5BB，140 Ru及栽培品种巨峰的选择性，发现根瘤蚜对栽培品种巨峰的根段具有很强的选择性，至接种后3d，67.13%的根瘤蚜优先选择巨峰；而对5BB和140 Ru的选择性却很差，分别有15.29%和17.58%的根瘤蚜选择5BB及140 Ru。

In an electrolytic cell with proton exchange membrane as the diaphragm, it was found from the electrooxidation of 3-picoline at a PbO2 electrode in acetone/water mixed solvents that the current density at the same anode potential not only increases remarkably, but also the selectivity and the current efficiency of electrooxidation from 3\|picoline to nicotinic acid increase obviously compared with the pure water as the solvent.

在以质子交换膜为隔膜的电解槽内，通过3-甲基吡啶在PbO2电极上的电氧化研究，发现在丙酮-水混合溶剂中，与纯水作溶剂相比，不仅在相同阳极电位下电流密度大幅度上升， 3-甲基吡啶电氧化生成烟酸的选择性和电流效率也明显提高。

The high selectivity cis-pinane prepared from α-pinene by catalytic hydrogenation with nickel catalysts was studied in this paper.

本文研究了以镍系催化剂催化α-蒎烯加氢合成高选择性的顺式蒎烷。

Under above conditions, the conversion of α-pinene was 85.6% and the selectivity of terpinyl acetate was 36.0%.

在此条件下，α-蒎烯转化率为85.6%，乙酸松油酯质量分数为36.0%。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。