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At 18 and 24 hours after culture, types of cell death were quantitatively detected using fluorescein isothiocyanate and propidium iodide staining.

25%，50%，100%浓度的3种材料浸提液体外培养小鼠成纤维细胞L929 24 h后，采用流式细胞术碘化丙啶染色法检测L929细胞的凋亡率及细胞周期分布情况。

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

The parameters such as resolution, laser divergence angle, focal length and field of view are quantitatively analyzed.

根据理论研究和实验验证推算的结果，证明了分析的正确性。

The refraction, reflection and propagation of the acoustic wave in a rod are studied quantitatively when a line-focused probe is employed in an axial scanning in immersion testing. The shape and position of the first and second focal line of the probe in the cylinder are calculated.

定量研究了采用线聚焦探头、液浸法、轴向扫描探伤时，棒材中声波的折射、反射和传播规律，计算得到了工件中的一次焦线和二次焦线的形状和位置。

The variation of focal spot size with the spatial phase perturbation and propagation distance has been analyzed quantitatively.The results indicate that the radius of focal spot increases with the propagation distance if once the threshold condition fulfilled.

讨论了强紫外激光在空气长程传输中所产生的受激旋转喇曼散射效应对其聚焦光斑形态的变化，定量分析了焦斑半径随入射强紫外激光的空间相位畸变及传输距离的变化。

Therefore, it is important to quantitatively seek the relations between foraminifera and environmental variables of coast.

然而，至今对海岸带有孔虫埋葬群与环境参数之间定量关系的认识却落后于深海区。

Stochastic medium model can be used to resolve such kind of task, During the construction of cities with sustainable development capability, underground project, in contrast to ground project, is always difficult to be solved quantitatively by enclosed analytical formulator, due to the complexity of rock medium.

在建设可持续发展城市的过程中，与地面建筑相比，地下工程处在岩土介质中，由于岩土介质的复杂性，一般难以用封闭形式的解析公式定量地求解问题。

Stochastic medium model can be used to resolve such kind of task, During the construction of cities with sustainable development capability, underground project ,in contrast to ground project ,is always difficult to be solved quantitatively by enclosed analytical formulator , due to the complexity of rock medium .

研究基坑开挖体周围地表的移动与变形是中国城市化进程加速发展过程中的一项新课题，用随机介质理论研究其规律能较好地解决这一难题。

In a series of experiments conducted using a four-ball wear tester, the organometallic reaction products were quantitatively measured under different conditions.

在一系列的试验用一个四organometallic磨损试验机、反应产品在不同条件下进行定量测量。

These properties constitute a set of fundamental parameters by which the rock may be described quantitatively.

这些性质组成一套基本的参数来定量的描述岩石。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了