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A down-converting mixer fabricated with 0.18μm RF CMOS technology is designed for OFDM-UWB applications.Differing from conventional Gilbert cell topology,a differential topology is proposed and applied in order to reduce the noise contribution and disturbance from the large signal of the local oscillation,as well as to lower the DC consumption of the mixer.

设计了基于正交频分复用超宽带系统的下变频混频器(Mixer ,并采用0.18μm RF CMOS工艺,通过一种不同于传统Gilbert结构的新颖的双平衡结构来实现,以降低本振大信号对输出中频端的噪声贡献和干扰,降低混频器的静态直流功耗等。

The origin of travelling wave and its propagation characteristics of modal components in time-domain and frequency domain are analyzed. The characteristics of configuration of railway Automatic Blocking/Power Continuous Lines and principle of various methods of travelling wave fault location are studied. Using transient surges extracted by transform voltage on the lines, a new method of double-ended principle of fault location is proposed.

本文分析了故障暂态行波的产生机理和模分量在时域、频域的传播特性,研究了铁路自闭/贯通线路的结构特点以及目前各种故障测距原理,提出了利用线路侧电压互感器提取暂态行波双端故障测距的新方法,该方法能够精确地测量各种类型的故障距离。

Therefore, the LsHNXs genes were cloned in this study, and their function was studied by RNAi. The main results were shown as follows:1 The conservative sequences of three LsHNXs genes (LsHNX1, LsHNX2, and LsHNX3), and the 3'-terminal specific sequences of LsHNX2 and LsHNX3, were cloned by RT-PCR and 3'-RACE.2 The plant RNAi vectors were constructed and the transformation of Limonium sinense was done. The RNAi lines of three single-genes and one double-gene were obtained and were propogated rapidly for the molecular and the stress tolerance analysis.3 To be compared with wild type, the Na+ and K+ contents secreted by the leaves of LsNHX1 transgenic plants were remarkably higher.

主要实验结果如下:1采用RT-PCR和3'-RACE方法从补血草中克隆获得LsNHXs基因家族三个成员LsNHX1、LsNHX2和LsNHX3的保守区序列以及LsNHX2和LsNHX3的3'端特异序列。2构建植物基因RNAi沉默表达载体并转化补血草,获得三个单基因和一个双基因的RNAi沉默表达植株,快繁转基因植株供分子鉴定和耐逆分析。3LsNHX1转基因植株叶片表面分泌物中的Na+、K+离子含量比野生型对照显著增加;叶组织内Na+离子含量和K+离子含量均略高,但差异不显著;K+/Na+比没有显著差异。4LsNHX2转基因植株叶片表面分泌物中的Na+离子含量比野生型对照有所下降,但差异不显著;K+离子含量比对照显著降低。

Low pulse before sift network operating principles : the use of double - sieve drum aircraft design; Work, pulp before sift upper tangent pressure the network into; Pulp the filter into the upper body of the dle two filter drum, double tilt-rotor rotary rotors, while the centrifugal force and centripetal forces role, through good mix inside and outside pool in sieve sieve drum body low extremity good mix of outflow; pulse in the tilt-rotor rotary drum filter

低脉冲网前筛工作原理:该机采用双筛鼓设计;工作时,浆料从网前筛上部切线压力送入;浆料从筛体上部流入到两个筛鼓中间,在双旋翼转子旋转时产生的离心力和向心力的同时作用下,良浆通过内、外筛鼓汇集于筛体下端的良浆管流出;脉冲旋翼在旋转时筛鼓不会赌赛,浆渣受转子旋转产生的轴向推动力,向下流送的同时被浓缩并逐步移到排渣口。

Low pulse before sift network operating principles : the use of double - sieve drum aircraft design; Work, pulp before sift upper tangent pressure from the network into; Pulp from the filter into the upper body of the middle two filter drum, double tilt-rotor rotary rotors, while the centrifugal force and centripetal forces role, through good mix inside and outside pool in sieve sieve drum body low extremity good mix of outflow; pulse in the tilt-rotor rotary drum filter

低脉冲网前筛工作原理:该机采用双筛鼓设计;工作时,浆料从网前筛上部切线压力送入;浆料从筛体上部流入到两个筛鼓中间,在双旋翼转子旋转时产生的离心力和向心力的同时作用下,良浆通过内、外筛鼓汇集于筛体下端的良浆管流出;脉冲旋翼在旋转时筛鼓不会赌赛,浆渣受转子旋转产生的轴向推动力,向下流送的同时被浓缩并逐步移到排渣口。

Two models were developed, one for calculating the leakage rate of water from heat transfer tubes due to one broken double ended guillotine tube in the steam generator of LMFBR using the one dimensional method of characteristics, and anotherone for temperature, adiabatic spherical to columnar hydrogen bubble growth model in large sodium water reaction.

采用一维特征线方法建立了快堆蒸汽发生器单管发生双端断裂情况下,水从破裂传热管流出的泄漏率计算模型和钠水反应气泡从球状到柱状的变温绝热生长模型。沸腾是钠冷快堆安全分析工作中必须要考虑的一个问题,而堵流是众多导致发生沸腾原因中十分重要的一个。

Only one drawback, in order to utilize the benefit, the client chipset needs to have similar features of dual band support (example: Dlink DWA-160 USB adapter) so that it can detect and decode the data transmission for these two bands simultaneously.

只有一个缺点,以便利用效益,客户端的芯片组都需要有类似功能的支持双频(例如: Dlink妇女事务部- 160 USB适配器),以便它可以检测和解码器的数据传输这两种波段同时进行。

The Ka-26 , designed at the beginning of the sixties, is built for maximum simplicity and versatility as a "lifting system" consisting of the powerplant, contra-rotating rotor assembly, cabin, landing gear and twin endplate fin tail unit.

这家26,在60年代设计的开始,是拥有最大的简单性和通用性为&提升系统动力装置的&组成的,对应旋转转子装配,座舱,起落架和双端板翅尾单位。

The concrete steps are: the lactic acid and small-molecule dicarboxylic acid react under the condition with the presence of the catalyst to directly polymerize the carboxyl-terminated lactic acid prepolymer; then the aliphatic polycarbonate diol and the catalyst are added; with the presence of the N2, the reaction is kept for 1 to 10 hours at the temperature of 150 to 200 Celsius system to get the poly lactic acid and polycarbonate copolymer of the low molecular weight; then the reaction is done in the twin-screw extruder at the temperature of 150 to 190 Celsius system to screw out the extension chain; finally the polylactic copolymer of the high molecular weight, toughness and heat resistance is made.

具体步骤是:乳酸和小分子二元酸在催化剂条件下反应直接缩聚合成羧基封端的乳酸预聚物,然后加入脂肪族的聚碳酸酯二元醇和催化剂,在N 2 气氛下,抽真空,在150~200℃温度下,反应1~10小时,得到低分子量聚乳酸/聚碳酸酯共聚物,然后在双螺杆挤出机中在140~190℃下,进行反应挤出扩链,最终得到高分子量的、韧性与耐热性较好的聚乳酸共聚物。

According to the features of traveling-wave fault location,this paper describes the double terminal traveling-wave fault location method which based on the wavelet modulus maxima theory and application and realization of HVDC transmission line traveling-wave fault location.

根据行波定位的特点,介绍了一种基于小波模极大值理论的双端行波故障定位的方法,以及这种方法在HVDC输电线路行波故障定位中的应用和实现方案。

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I didn't watch TV last night, because it .

昨晚我没有看电视,因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。

I'm running my simile to an extreme.

我比喻得过头了。