查询词典 RF

We have synthesized a series of 4,4′ perfluoro-alkylated bipyridine ligands[4,4′- bis(RfCH2OCH2)-2,2′-bipyridine , Rf=HC4F8(1a), HC8F16(1b), C3F7(1c) and C10F21 (1d)] by nucleophilic substitution reactions. The reaction of fluorinated alkoxide on 4,4′-bis-2,2′-bipyridine results in the systheses of these four fluorinated ligands. These reactions are high yieldings and purification is easy. The structures are analyzed by GC-MASS、NMR、FT-IR etc.

中文摘要我们已合成出一系列在联吡啶的4，4′位置有两个氟化烷基侧链的联吡啶配位基[4，4′-bis(RfCH2OCH2)-2，2′-bipyridine ， Rf=HC4F8(1a)， HC8F16(1b)， C3F7(1c)及C10F21(1d)]，经由亲核取代反应，由4，4′-bis-2，2′-bipyridine反应而得，并具有不错的产率，其纯化也简易可行，所合成之产物并可用GC-MASS、NMR、FT-IR鉴定其化学结构。

G. Smith Anderson, chairman and chief executive of Uraxs Communications Inc., said that the most utilitarian aspect of the standard, as well as the weightiest, is an 800-page section describing impact of UWB on existing RF systems.

美国Uraxs Communications公司的董事长兼执行长G。 Smith Anderson表示，该标准的最重要价值是长达800页对UWB采用现有RF系统影响的描述。

RF MEMS varactors with Electrostatic actuation have become ahot topic in academic research.

利用静电驱动的RF MEMS压控电容成为了人们研究的一个热点。

The reference signal generating unit includes a local reference signal generator, an RF converter, a splitter, a phase detector, and a phase shifter.

参考信号发生单元包括本地参考信号发生器、RF转换器、分离器、鉴相器和移相器。

Monolithic spiral transformers have been used in many microwave and RF ICs to perform impedance matching, signal coupling, phase splitting, etc.

单晶螺旋变压器已经应用於许多微波与RF电路上，其功能主要完成阻抗匹配、讯号耦合、相位劈列等等。

The RF choke is around 100uH and could be home-wound with 180 turns of 0.1mm wire on a 1/4 watt resistor of high value : say over 400K. L is wound with 18 turns [5+13] of 0.33mm wire on an 8mm former with ferrite core.

对于大约100uH的RF扼流圈，通过使用0.1mm的线在1/4瓦的高值电阻，如400K欧姆上绕180圈即可得到，L通过使用0.33mm的线在一个8mm样板的铁氧体磁芯上绕18圈即可。

The system uses RF Handheld provide customers with a warehouse receipt, seized goods, inventory, position management, operation and other security features.

该系统利用RF Handheld 为客户提供了仓库的收货、捡货、盘点、仓位管理、保安功能等各种操作。

A novel design of capacitive RF MEMS switches using torsion spring is presented.

介绍了一种基于扭转的新型低压电容式RF MEMS开关的设计。

Subsequently, owing to the self-adaptability of the amplifier gain, the amplifier adjusts the self-gain according to the input RF signal amplitude, leads the output voltage to be stable, and ensures the normal operation of the sub-step circuit.

而后由于放大器增益的自适应性，放大器根据输入的RF信号幅度调节自身增益使得输出电压稳定，保证了后级电路的正常工作。

Remember that it is the sum of the risk-free interest rate rf and a premium for risk.

记住它是无风险利率 rf 与风险溢价的合计。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。