For the pemfc cathode , besides above the parameters , the effects of the thickness of the reaction layer , the ion conductivity of nafion electrolyte and the electronic conductivity in carbon phase of the reaction layer on the electrode performance have also been investigated 在对pemfc阴极的研究中，除了以上参数以外还考虑了反应层厚度， nafion ~ ( ? )电解质的离子传导率以及反应层中碳相传导率对电极性能的影响。
Synthetic cryolites is mainly used as the flux in the aluminium electrolysing and the fillers of rubber , grinding wheel , the milk whiter agent of enamel glass - shaded and the flux of the non - iron metal , etc . its merits are adjustable molecular ratio , lower cost and good fluidity 人造冰晶石可作电解氧化铝的助熔剂，橡胶，砂轮的填充剂，搪瓷玻璃罩的增白剂及非铁金属的助溶剂等，它具有可调整的克分子传导率，成本低，流动性好等优点
In order to examine the influence of soil hydraulic characteristics on land surface process , the four soil hydraulic models are coupled with the simplified simple biosphere model ( ssib ) respectively and the simulated net radiation , sensible heat , latent heat and soil heat fluxes by the four coupled model are compared 利用ssib模式研究了不同的土壤水力模式对陆面过程模式模拟结果的影响。利用ssib mm5耦合模式研究了在陆面过程模式中土壤水力传导率等计算上的差异对大气模式模拟结果的可能影响。
Common test methods for cables under fire conditions - tests on gases evolved during combustion of materials from cables - procedures - determination of degree of acidity of gases for cables by determination of the weighted average of ph and conductivity - determination of degree of acidity of gases for cables by determination of the weighted average of ph and conductivity 燃烧情况下电缆的一般检验方法.电缆材料燃烧时产生的气体的试验.程序.通过测量ph值和传导率的加权平均值测定电缆燃烧产生的气体的酸度
In this dissertation , we firstly prove that any dirichlet problem is indeed equal to a voltages problem of networks . we give five solutions to dirichlet problem in two dimensions ; among these five solutions , we prove that the iteration solution and the solution of relaxations are exponential convergence , then we estimate their respective convergence rates ; secondly , we discuss random walks on general networks , prove that there is an one to one correspondence between networks and reversible ergodic markov chains ; thirdly , we give probabilistic interpretation of voltages for general networks : when a unit voltage is applied between a and b , making va = 1 and vb = 0 , the voltage vx at any point x represents the probability that a walker starting from x will return to a before reaching b ; furthermore , we study the relationship between effective resistance and escape probability : starting at a , the probability that the walk reaches b before returning to a is the ratio of the effective conductance and the total conductance 本文证明了任何边值的dirichlet问题都可转化为求解电路电压的问题：给出了计算平面格点上dirichlet问题的5种方法：证明了迭代法和松驰法都是指数收敛的，并分别给出收敛速度的估计；讨论了一般电路上的随机徘徊，验证了电路与可逆的遍历markov链是一一对应的；给出了电路电压的概率解释：当把1伏电压加于a ， b两端，使得v _ a = 1 ， v _ b = 0时，则x点的电压v _ x表示对应的markov链中，从x出发，到达b之前到达a的概率；进一步地，给出了逃离概率与有效电阻之间的关系：从a出发，在到达b之前到达a的概率为有效传导率与通过a的总传导率之比。
Based on the material of optics acrylic ， applying lcd screen and the back light model setting technology of on - knee computer , through the high conduction of light guide dot , after the accurate calculate , the super - thin light guide plate light - box is formed by refracting the light of light guide plate into the even - rays state of light - panel 超薄导光板是以光学级压克力为基材，运用lcd显示屏及笔记本电脑的背光模组技术，透过导光点的高光线传导率，经电脑对导光点计算，使导光板光线折射成面光源均光状态制造成型。
