衰减

To evaluate the role of the right lateral imaging in the attenuation correction of left ventricular inferior wall. The RL imaging were obtained immediately after the supine imaging. The inferior wall configuration and regional myocardial counts were assessed by tomography imaging and quantitative polar map analysis for 31 normal controls and 22 coronary artery disease patients all with coronary arteriography.

为探讨右侧卧位对左室下壁心肌衰减校正和心梗诊断的价值，对31名正常者和22名冠心病病人同时进行了仰卧位和右侧卧位的99mTc-MIBI静息心肌显像，病人均作了冠状动脉血管造影。

The mass flow rate and power of generator and the background pressure affect the attenuation of vertically polarized wave.

发生器流量、功率以及实验真空度对垂直极化电磁波在等离子体中的衰减影响明显。

The collisional absorption of the right circularly polarized wave and the left circularly polarized wave propagating parallel to the magnetic field by inhomogeneous magnetized plasmas is discussed, and the attenuations are calculated under different conditions.

讨论了不均匀磁化等离子体片对平行于磁场方向传播的左、右旋圆极化电磁波的碰撞吸收，计算了不同条件下衰减率。计算表明，当电磁波的频率接近电子碰撞频率时，磁等离子体对电磁波的吸收达到最大值。

The adjustment principle of the system is analyzed and the transmission curve under the different rotation angle of circular polarizer is shown.

对衰减系统的调节机理进行了分析，并给出圆偏器旋转不同角度下系统的透射曲线。

Objective: Attenuation correction is one of the most important corrections in the quantification of positron emission tomography.

目的：在正子断层扫描之定量分析中，衰减修正为最重要的修正之一。

The result indicated that the degree of influence to the reliability of existing structure in the order high to low are resistant force decreasing, resistant force posterior distribution and live load.

计算结果表明，影响既有结构可靠度的三个主要因素中，其显著性程度按照由高到低的次序是：抗力衰减、抗力后验分布、活荷载取值。

An analytical model for tunneling transmission through a high—frequency potential barrier in a ballistic channel is formulated.

不仅是量子波导中的传播态决定其弹道输运的过程，衰减态在电子波传播中的作用也是不可忽略的。

We found that the time coefficients of POTT 、POTTOT and POTPyOT in solution are the same (~0.6ns) due to Intersystem crossing.However, the decay ISC time coefficient is 2.0ns for POTPy. We propose that rotation of the single bond between adjacent thiophenes enhances the rate of ISC. The results of these compounds in PMMA films and theoretical calculations confirm this mechanism.

在动力学量测方面，POTT、POTTOT及POTPyOT在溶液的结果是相似的，系统间转换过程的衰减时间常数都是~ 0.6 ns，然而在POTPy溶液中~ 2.0 ns，我们推测噻吩与噻吩之间单键的旋转运动加速了系统间转换的过程，而这个假设将由PMMA薄膜及理论计算的结果来加以证实。

In the experiment, some testing measures are adopted to ensure geting reliable results. For example: coupling liquid is used between the transducer and the specimen to ensure efficient transmission. In order to reduce the system nonlinearity, the loading power of the amplifier is enlarged.

实验过程中还采取了一系列确保超声非线性测量结果可靠性的措施，如：为了减少超声传播过程中的衰减，在压电探头和试样的接触表面加入耦合剂；为了降低实验系统本身产生的非线性，加大了放大器的加载功率。

To obtain an accurate measure of the precessional rate one has to attenuate the signal proportional to torquing current by cosβ.

为了准确测量进动角速度，必须使与加矩电流成比例的信号衰减cosβ倍。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。