射频

For clarity's sake, the frequency range of nonionizing radiation used in wireless communications is referred to as "radiofrequency/microwave radiation" or RF/MW.

为明确起见，频率范围的辐射nonionizing中使用的无线通信被称为&射频/微波辐射&或射频/兆瓦。

A 2. 5～5. 5 MHz transducer was used according to the acoustic depth of the heart examined. Group B was used x-ray fluoroscopy (a Philip mono-rotatable C arm X-ray equipment) as image guide with routine method reported by american college of cardiology cardiovascular technology assessment committee. TTE guiding CSC in site: The guide wire was inserted into left subclavicular vein and inferior vena cava and it was displayed clearly by TTE. The sheath could be displayed clearly too by TTE. CSC was put through the sheath into right atrium in prone position and was thoroughly showed by TTE via untypical parasternal four-chamber view.

本研究对60例心内电生理检查患者，应用TTE作为影像学引导的可行性和临床应用的方法学进行了探讨，并对5只犬TEE引导射频导管消融术时大头电极导管到位的可行性进行了动物实验研究，具体为：(1)专用冠状窦电极导管置放时TTE引导的可行研究；(2)普通电极导管置放时TTE引导的可行研究；(3)专用冠状窦电极导管和普通冠状窦电极导管置放时TTE的对比研究：(4)TTE引导His束电极导管和右室电极导管到位的临床应用研究；(5)TTE在心内电生理检查中的应用研究；(6)TEE引导射频导管消融术大头电极导管到位的实验研究。

In chapter four, after analyzing the RF qualification, I design the receive scheme of RF and IF parts, and accomplish the choosing of chip and design of peripheric connection of chip.

第四章在分析CDMA基站仿真系统射频技术指标和要求的基础上，设计了射频、中频发射接收方案，并完成了芯片的选择和芯片外围连接设计。

Compound semiconductor devices are key parts of RF communication applications because they have advantages of high electron mobility, high working frequency, low RF loss, high linearity and low noise. It is so-called "pHEMT" for full name "Pseudomorphic High Electron Mobility Transistor".

中文摘要Ⅲ-Ⅴ族化合物半导体材料所制成之元件，具有高载子迁移率、工作频率高、射频损耗低、高线性度、低杂讯等优势，使得Ⅲ-Ⅴ族化合物半导体元件成为现今射频通讯应用之关键部份。pHEMT为假晶高电子迁移率电晶体之简称。

ERCP were performed on 52 patients with malignant biliary obstruction to investigate the locus and extent of the obstruction, and treated with radiofrequency to the stenosed segment, then placed the matched metal stents into the bihary duet.

方法共58例患者采用联合治疗：6例十二指肠乳头癌先作内镜下乳头局部切除，而后对残留病灶作射频消融；52例经ERCP测出肿瘤狭窄段的范围，对狭窄段作射频消融，然后置入相匹配的金属内支架。

Methods17 cases with striae graviderum in abdomen were treated by radiofrequency at 200～600j, five times for a course of treatment, meanwhile, taking photographs and observing the reaction before and after treatment.results17 patients had treated for a course of treatment, the total effective rate was 94%.there were not any complication.conclusionradiofrequency is a non-invasive and effective treatment for striae gravidarum.

应用射频治疗仪对17例妊娠纹患者进行治疗，治疗能量200～600j，5次为一疗程，治疗前后给患者拍照，并观察疗效。结果：共治疗17例患者，16例治疗1个疗程，总有效率为94%，未出现任何皮肤灼伤等并发症。结论：射频治疗技术无创、安全，是治疗腹部妊娠纹的一种较好方法。

The application of intelligent electronic theftproof communication in automobile industry is researched based on the RFID technology,and the approach to enhance the RF communication data security is proposed in this paper.

以射频识别技术为基础，研究智能化的电子式防盗通信在汽车领域的应用，提出增强射频通信数据安全的途径。

Three months later, the surface of the articular was smoother than the sham-operated side. The histological score of cartilage was significantly higher than the sham-operated side in patellofemoral joint group p＜0.05=, in the tibiofemoral group the difference was not obvious.

处理后3月，发现髌股关节组双极射频治疗侧髌骨软骨表面仍光滑，软骨组织评分高于对照侧（p＜0.05）；胫股关节组双极射频治疗侧股骨内髁软骨面的形态比对照侧平整，软骨组织学评分没有显著差异。

Transmit/receive antenna selection barters little lost of system performance for great decreasing of RF cost, making MIMO system not fully limited by RF cost.

发射／接收天线选择方法能以很小的性能损失换取射频成本的大幅度降低，使MIMO系统不完全受射频成本的限制。

The capacity of MIMO system is increased linearly with the number of the antennas in multi-path fading environments, and transmit/receive antenna selection barters little lost of system performance for great decreasing of RF cost, making MIMO system not fully limited by RF cost.

摘要在多径衰落环境中， MIMO系统的信道容量随天线数的增加呈线性增加，发射/接收天线选择方法能以很小的性能损失换取射频成本的大幅度降低，使MIMO系统不完全受射频成本的限制。

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。