It was found that the start - up and step response time of pem fuel cell was in the order of seconds , which was similar to the simulation results of most presently used models 结果表明：电池的启动时间和阶跃响应时间均为秒的数量级，与大多数模模拟的结果相一致。
This can be provided in several ways , but the easiest way to do so is to store the certificates as a pem file and load them into openssl as shown using 对象提供一个默认的信任证书，这可以使用几种方法来提供，但是最简单的方法是将这个证书保存为一个pem文件，并使用
Finally , the possibility of engineering application and accuracy of the pem in analyzing the random response of non - linear structures are discussed based on the work outlined above 在此基础上，探讨了用虚拟激励法分析非线性随机振动问题应用在工程实际中的适用性和精度。
A dynamical model of h2 fuel cell stack with water balance is developed in this paper for studying steady and dynamical performances of proton exchange membrane ( pem ) fuel cell stacks 摘要提出和建立了包含水平衡的氢燃料电池堆的动态模型，用于研究质子交换膜( pem )燃料电池堆的静、动态性能。
Mouse homeobox gene pem was newly isolated in 1990 ' s . its expression pattern during the murine ontogeny and in the adult tissues is unique , namely , in a stage and spatial specific manner Pem基因在小鼠发育过程及成体部分组织中呈时间和空间特异性表达，并在一系列肿瘤细胞株中持续表达。
When visiting oper class boards , and hearing pem discuss pier weaknesses , always someone points out " it ' s not pat bad , at least we ' re not warriors " . . . . . . and everyone agrees 当你到别人职业的论坛浏览时，你听到他们在讨论他们职业的弱点，总有人会说：我们还不算太糟糕，至少比战士强。每个人都同意这个观点。
Making use of the computing model and technique above described , these pem parallel computer prograrns for calculation of 2d and 3d turbulent flow have been coded by ebe - pcg and ebe - bicgstab 利用上述的计算模型和处理技巧，结合ebe - pcg算法和ebe - bicgstab算法，编制了二维和三维紊态流场的有限元并行计算程序。
Then , a three - dimensional , comprehensive , steady - state mathematical model is described to investigate the fluid flow , heat transfer , species transport and electrochemical reaction in the pem fuel cells 然后，发展了一个用于研究质子交换膜燃料电池特性的三维综合的数学模型，模型同时考虑了流体流动、热量传递、电荷传递、多组分传递和电化学动力学。
Direct methanol pem fuel cell ( dmfc ) is recognized as a new alternative to the present power sources because of its characteristics of high efficiency , high power density , low emission and easy fuel carriage 直接甲醇聚合物膜燃料电池(简称dmfc )以其高效、高能量密度、低排放和燃料储运及补充方便等特点被认为是一种适应未来能源和环境要求的理想电源。
Should the problems not be solved , please check whether the certificate has been collocated certificate chain , i . e , looking over whether there is the file with the suffix " pem " in the pem 如果，问题还没有解决，那么请检查是否配置了证书的证书链，也就是检查pem目录下，是否有证书链文件，如果不存在任何pem后缀的文件，那么请在pem目录下，添加证书链文件。
