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Finally, cell wall degraded and aggregated together, which results in gas spaces formation in a radial direction.3. Aerenchyma formation appeared to be a form of nonapoptotic programmed cell death in the middle of root cortex.

3稻根内通气组织形成的实质很可能是位于内皮层和外皮层之间的皮层细胞发生非凋亡的程序化细胞死亡形成的。

A new PA cell structure is designed to accelerate the drift velocity of the sample gas near the cell surface, so that the short response time at the flow rate of 100 sccm (standard cubic centimeter per minute) is achieved.

特殊设计的光声池结构提高了样品气体在池表面的流动速度,从而加快了氨分子在池表面吸附——解吸附的平衡过程,实现光声池对氨气浓度变化的快速响应。

Several combined cycles of fuel cell (mainly SOFC solid oxidate fuel cell) with gas turbines and their different performances are compared, and the good prospects are pointed out.

最后着重就燃料电池(主要是SOFC固体氧化物燃料电池)和燃气轮机联合循环的几种方案和各种性能进行比较,指出了其良好的前景

It establishes the uniform, singular and two kinds of normal distributions models of diffusion layer statistical distribution, the result shows that the more singular the statistical distribution of the cathode gas diffusion layer porosity is, the better the cell performance is, and the more uniform, the worse the cell performance is.

最后,从热力学的角度分析了燃料电池过程的能量转化形式,反应的焓变主要转变成电能和热能两种能量形式;归纳了燃料电池电化学的一些基本理论模型及简单的推导过程;描述了燃料电池效率的一些不同的定义以及对采用热电联供的方式提高燃料电池能量利用效率的分析。

An apparatus simulating the discharge in AC PDP cell is thus designed. It consists of a driving power, discharge cell and vacuum system. Measuring are made possible on the working voltage and stability of dielectric protective film made from different materials with a variety of different processes. The secondary electron emission property can thus be properly reflected. Examinations are also the gas species, mixture composition ratio and pressure, discharge gap, etc., with reference to the discharge characteristics in AC PDP.

该装置由驱动电源、放电室及真空系统组成,能够模拟AC PDP的工作条件和过程,可用来测量AC PDP工作过程中用不同材料、方法及工艺制成的保护膜的工作电压、稳定性等,从而衡量保护膜的二次电子发射性能,还可用来测量AC PDP放电单元内所充气体的种类、混合比例、压力以及放电间隙的距离等参数对AC PDP放电特性的影响。

Desulfurize cell deoxidizes the sulfuric acid to its deoxidization form ,then fixs it on the protein for degradation SO2 of flue gas. And the activating energy of immobilized cell to degrade SO2 is 39.5 kJ/ mol.

用活性碳吸附海藻酸钠包埋已二胺交联制备固定化微生物不仅能保持微生物较高的活性,而且还具有高的机械强度、好的传质性和强的耐酸性。

The study aims at the performance of a proton exchange membrane fuel cell with interdigitated flow field, its influencing factors and feasible ways to improve it. The necessity and advantages of using interdigitated flow field were introduced. A three-dimensional, two-phase and steady-state numerical model was developed. The computational domain of the model consists of the flow channels, gas diffusion layers and catalyst layers in both anode and cathode sides and the PEM in PEM fuel cell.

为研究交指流场质子交换膜燃料电池的输出性能,分析影响其性能的因素,寻找改善其性能的可行措施,探讨了使用交指流场流道的必要性和优越性,建立了包括质子交换膜燃料电池阴极/阳极侧流道、扩散层和催化层以及质子交换膜在内的完整的稳态、三维、两相数学模型。

First, a full three-dimensional numerical model is developed, which considering not only the rib resistance to the species, but both the single- and two-phase flow and transport in the gas channels and diffusers at both the anode and cathode sides of PEM fuel cell. Two sets of boundary conditions, one for a conventional flow field and the other for an interdigitated one, are presented. A detailed discussion of the numerical techniques for the PEM fuel cell model is given with a flow diagram to provide an overview of the solution procedure using FORTRAN language.

该模型考虑了双极板上流道间的筋部对于反应气体传递阻力以及电流密度分布的影响,从而使模型具有三维特性;建模过程中进一步考虑了流道和扩散层中可能存在的液态水,从而将现有的单相流动模型拓展成为两相流动模型,因此,该模型可以同时模拟电池内部阴极、阳极侧流道和扩散层中两相流动的发生和分布情况;分别给出了平行流场燃料电池和交指型燃料电池的边界条件;详细讨论的三维模型的耦合求解算法和技巧;用实验数据验证的该模型的准确性。

Then, this paper researches the effects of the single cell cathode porosity distribution of gas diffusion layer on the cell performance from analytical and statistical point of view.

然后,从解析和统计的角度对单电池阴极扩散层孔隙率的分布对电池性能的影响进行了研究。

The study focuses on transport phenomena of cathode gas diffusion layer of PEM fuel cell by using two-phase flow model. Liquid water saturation and oxygen concentration profile in gas diffusion layer and polarization curve are investigated by numerical simulations.

本研究主要探讨质子交换膜燃料电池阴极气体扩散层内的两相流传输现象,利用数值方法求解出燃料电池阴极气体扩散层内液态水饱和度分布、氧气浓度分布以及性能曲线。

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The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作:对伸臂位于顶部的单层框架—筒体模型进行分析,提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。

Its advantage is that it can be used in smaller units.

其优点在于可以在较小的单位中应用。