查询词典 RF

The effects of cadmium stress on POD activity of D. caryophyllus were mainly on the change of individual enzyme belt Rf value, the drop of enzyme band number, and the increase of enzyme activeness.

镉胁迫下对石竹叶POD的影响主要表现为个别酶带Rf值的改变、酶带数的下降和活性的增加。

Shell Cassida Fluid RF 46, 68 and 100 are high performance synthetic lubricants used for compressor s in refrigeration systems.

壳牌加适达RF 46、68和100润滑油是高性能合成润滑油，适用于制冷系统的压缩机。

Each cathode (1) is connected to an rf signal supply (8) through an associated coupling means (4) and the anode (2) is adapted to provide a surface area over which a plasma discharge may occur that is not substantially greater than the total cathodal area over which the discharge may occur.

每个阴极（1）通过一个所配合的耦合装置（4）接至rf信号源（8），而阳极（2）所提供的能发生等离子放电的表面面积基本上不大于能发生放电的总阴极面积。

These three kinds of Bile extraction were qualitatively detected by using the paper chromatography and infrared spectral scanning method, and the results show that These extractions have the same Rf value and infrared spectra's characteristic absorption peak as choleic acid, glycocholic acid and taurocholic acid standard preparation which can prove that These three kinds of Bile extraction are choleic acid, glycocholic acid and taurocholic acid respectively.

采用薄层层析法和红外光谱扫描法对提取物进行定性检测，结果证明三种提取样品分别与胆酸、甘氨胆酸及牛磺胆酸标准品显色斑点Rf值相同，红外光谱特征吸收峰均一致，表明提取出的三种样品分别为胆酸、甘氨胆酸、牛磺胆酸结晶体。

The THK RF-4E Phantom II was too close to its "mission target" to take some hi-res S300 missile pics, based on Creta island - oh yeah Greek island too!

土耳其的RF-4E 鬼怪2曾非常接近他的任务目标（拍摄高分辨率的位于希腊诸岛及克里特岛的S-300导弹图片）。

The RF cage and new cage were respectively inserted into FEM of lumbar spine in L2-L3 motion segment for comparing the biomechanical features, such as stress of adjacent disc, contact pressure of interface between cancellous bone and cage, subsidence, dislodgement and range of motion.

而新设计椎间融合器和现有的RF融合器分别被放在L2-L3的运动肢段中，比较它的生物学特色，如邻近椎间盘应、骨头与融合器之间的接触压、下陷、移位和运动范围。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

Measurement of internal parameters of electrooptically Q-switched RF excited waveguide CO2 laser using rotatable phase plate .

旋转波片法测量电光调Q射频波导CO2激光器的内部参数。

Study of electrooptically Q-switched RF excited CO2 waveguide laser with line selected by grating.

光栅选支电光调Q射频激励CO2激光器研究。

Ms is a dominant sterile gene and Rf is a dominant epistatic gene.

萍乡显性核不育水稻不育株的育性由两对显性核基因Ms〓和Rf〓互作控制。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。