Phase coherence between RF transmitter and receiver in digital MRI spectrometer was studied.
讨论了一种在核磁共振成像数字谱仪中保证射频发射机与接收机之间射频信号相位相干的方法,该方法在成像脉冲序列执行过程中,同步切换发射机与接收机的频率,并在脉冲序列最后,将发射和接收频率恢复到脉冲序列最初的频率值,从而实现发射与接收的信号相干,其优点是无需加入额外的"回绕延时",从而使得脉冲序列的编写得到简化,并且该方法不依赖于磁共振谱仪发射机和接收机硬件部分的具体结构,是适用于数字化谱仪的一种普遍的方法。
This paper analyzes the RF transmitter architectures for mobile phone systems,firstly.
本文分析了移动通信射频发射机结构,在此基础上对零中频CDMA发射机结构和关键技术进行了理论分析与系统仿真。
The application of radio frequency nRF905 in flue gas desulfurization;
射频芯片nRF905在烟气脱硫系统中的应用
The clinic observation of epistaxis treated with radio frequency and sinus endoscopy;
鼻内镜下射频治疗鼻出血的临床观察
Radio frequency for refractory epistaxis of small vessel expansion on nasal septum;
射频治疗鼻中隔小血管扩张性顽固性鼻出血
Study on the Parameter of ZnO Thin Films Deposited by RF Magnetron Sputtering;
射频溅射法生长ZnO薄膜的参数研究
Research on the Dielectric Constant of Frozen Spanish Mackerel and RF Defrosting;
冷冻鲅鱼的介电常数与射频解冻效果研究
The integrated method of smart-home based on RF;
射频模式下家庭自动化集成方案
Radio-frequency influences on Cu film deposited by unbalanced magnetron sputtering;
射频对非平衡磁控溅射沉积Cu膜的影响
Radio-frequency and stryker instruments under nasal endoscopy for 68 cases of adenoidal hypertrophy;
鼻内镜下射频结合电动切削器治疗儿童腺样体肥大68例
Design of slow-paced radio-frequency thermo-therapeutic system for liver cancer;
射频热缓释肝癌热疗计划系统的研制
Influence on immunology of the rats: by combinative treatment of dendritic cells and radiofrequency ablation to the solid tumor;
致敏树突状细胞联合射频消融治疗对荷瘤大鼠免疫机能的影响
Treatment of face acne vulgaris with nonablative radiofrequency;
射频治疗面部寻常性痤疮
Clinical Application of Radiofrequency Thermocoagulation and Target Ablation in Treatment of Lumbar Intervertebral Disc Protrusion;
射频靶点热凝术治疗腰椎间盘突出症的临床应用