查询词典 cell theory

According to the theory of stress-strain relationship of transverse compressive deformation and wood rheological character, it studies the factors about deformation permanent fixation caused by different methods, and analyzes the component change of wood cell wall caused by four physical treatment methods in this experiment. According to the newest research achievements, it is thought that the absolute release of deformation stress and the effective formation of cohesion inside wood are the main reasons of compressive deformation's permanent fixation.

根据木材横纹压缩应力-应变关系、木材流变学特性等理论对木材压缩及变形固定常用方法对形成变形永久固定的主要原因进行了探讨，根据前人对横纹压缩变形的永久固定理论及本实验中使用的四种物理处理方法在处理过程中对木材细胞壁基质物质的变化和表现出的力学特性的影响进行了分析，结合国内外最新研究成果，认为形成木材压缩变形永久固定的主要原因是木材内部变形应力充分释放和内聚力的有效形成。

And based on electromagnetic theory we have electricity, telephone, cell phone, you know, telecommunications industry, all that.

基于电磁场理论，我们有电力，电话，手机，大家都知道，电信行业，这一切。

Because the price of photovoltaic cell is expensive and conversion efficiency is low presently, the Maximum Power Point Tracking is absolutely necessary, in order to decrease system cost and increase efficiency, The paper focuses on the stand-alone photovoltaic system and analyzes it with theory.

本文以独立光伏发电系统为研究对象，对其进行了理论分析，从系统的参数选择、拓扑结构、控制策略、最大功率跟踪及蓄电池的保护等方面作了详细的分析和研究。

These observations appear, in theory, to suggest that life-threatening cancer progression could be indefinitely avoided by the roughly decadal reseeding of all our stem cell pools with autologous ones that had been engineered ex vivo to lack the genes for telomerase or ALT, but to have long telomeres.

在理论上，这些观察显然提示了，威胁生命的癌症进展可以被无限期地避免，办法是大约10年就用自身干细胞来种植一次我们的全部干细胞库――这些自身干细胞已在体外经过加工，使其缺乏端粒酶基因或 ALT 基因、但有很长的端粒。

The main research work of this dissertation is as follows: Based on the chemical reaction engineering theory and the nitrobenzene electroreduction mechanism, the plate and frame electrolyzer was designed and applied to the process of electroreduction nitrobenzene to p-aminophenol. This dissertation measured the residence time distribution data of the electrolyzer by means of the pulse response method and studied the rule of flow pattern along with the current capacity change. Under different conditions ,this dissertation studied the cyclic voltammetry properties of nitrobenzene on different electrodes by means of the dynamic cyclic voltammetry method and the electrode materials applied to the NB electroreduction have been selected primarily.Baseed on the results of cyclic voltammetry tests, this dissertation used p-electrode systems to measure the steady-state- polarization curves of nitrobenzene on different electrodes in H-type diaphragm cell, and obtained each primary factor s influence rule and the exchange current density value of each electrode.And then on the basis of the conclusions of fundamental researchs upword, the effects of influence factors on the the yield of p-aminophenol and the current efficiency,such as electrode material, current density, quantity of electricity circulated, nitrobenzene concentration . sulpuric acid concentration and so on, have been studied in detail in the systems of hign temperature , strong acidity and oxygen-poorthrough a series of electrolysis experiments in this paper.After all using Pb as anode Monel metal as cathode Dupont Nafion 417 cation-exchange membrane as membrane, this dissertation obtained the optimum technological condition: reaction temperature about 85C, current density 500A m-2, sulphuric acid concentration 20%wt.

论文的主要研究工作为：运用化学反应工程理论，结合硝基苯的电还原机理，设计出用于硝基苯直接电还原合成对氨基苯酚实验的板框式电解槽，并利用脉冲响应法测定了该板框式电解槽的停留时间分布数据，研究了流型随流量变化的规律；通过动态循环伏安法研究了硝基苯在不同电极上、不同条件下的循环伏安特性，初步评选出了用于硝基苯电还原的电极材料；结合循环伏安的测定结果，在H型隔膜电解槽中采用三电极体系测定了硝基苯在不同电极上、不同条件下的稳态极化曲线，得到了各主要因素的影响规律及硝基苯在各个电极上电还原的交换电流密度数值；在基础研究结论指导下，采用板框式电解槽，在高温、强酸、贫氧系统中，进行了一系列的电解实验，分别考察了电极材料、电流密度、通电量、硝基苯浓度、硫酸浓度等因素对收率及电流效率的影响，最终选择以蒙乃尔合金电极作为阴极、铅合金为阳极、Dupont Nofion 417阳离子交换膜为隔膜，得到由硝基苯直接电还原制对氨基苯酚的最佳电解工艺条件：反应温度85℃，电流密度500A·m~(-2)，硫酸浓度20％wt。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。