基于重要性水平分析的含磷化合物火焰抑制的简化机理(英文)

A reduced mechanism for propane/air combustion and its flame inhibition by phosphorus-containing compounds (PCCs) is constructed with the level of importance (LOI) method. The analysis is performed on solutions of freely propagating premixed flames with detailed chemical kinetics involving 121 species and 682 reactions proposed by Jayaweera et al. For the non-homogeneous reaction-diffusion system, the chemical lifetime of each species is weighted by its diffusion timescale, and the characteristic flame timescale is used to normalize the chemical lifetime. The definition of sensitivity in LOI is extended so that multi-parameters can be used as sensitivity targets. Propane, oxygen, dimethyl methylphosphonate (DMMP), and flame speed are selected to be perturbed for sensitivity analysis, the species with low LOI index are removed, and reactions involving the redundant species are excluded from the mechanism. A skeletal mechanism is obtained, which consists of 57 species and 268 elementary reactions. Calculations for laminar flame speeds, key flame radicals and catalytic cycles using the skeletal mechanism are in good agreement with those by using the detailed mechanism over a wide range of equivalence ratio undoped and doped with DMMP.     

焊后热处理对NiCrMo-3熔敷金属腐蚀行为的影响

以NiCrMo-3合金熔敷金属为研究对象,通过扫描电子显微镜、透射电子显微镜、X射线衍射仪等研究了原始焊态与690℃保温8 h热处理态熔敷金属的耐腐蚀性能差异.结果表明,与焊态试样相比,热处理试样具有良好的耐晶间腐蚀性能,在HNO₃溶液中浸泡不同的时间发生了点蚀和晶间腐蚀;热处理态金属除了点蚀与晶间腐蚀还发生了部分枝晶间腐蚀行为.热处理后的试样由于NbC,Laves相数量及尺寸的增加导致腐蚀敏感性升高.析出相NbC,Laves相与基体的电位差导致在腐蚀介质作用下发生点蚀.晶界析出物导致Ni,Cr元素含量的降低,从而增加了熔敷金属晶间腐蚀敏感性.热处理后由于元素再分配导致枝晶间Nb,Mo等元素的富集和Ni,Cr等元素的贫化,引起枝晶间腐蚀.     

EV100叉车调速器故障诊断

EV100型电动车辆调速器是美国通用电气公司生产的，其电力电子器件为晶闸管，晶闸管的触发信号和各种逻辑控制信号均由微处理器产生，逻辑控制电路的稳定性较好，一般故障率较低，故障诊断着重在外部电路上。由于EV100型调速器的液压泵电路和转向电路独立于走行电路之外，现分别进行分析。     

化学法高效立式废水处理装置

介绍了一种小型、立式高效废水自动处理装置，具有投资少、占地省和废水ｐＨ自动调节的特点。该装置适合于含锌、铜和镍等废水的处理。     

在YT15硬质合金中添加稀土的新工艺

采用稀土硝酸溶液对TiC-WC固溶体掺杂新工艺,制得了高性能的含稀土YT15硬质合金,当稀土含量为0.1％～0.2％时,可使YT15合金的抗弯强度提高10％～25％。该工艺简单、成本低廉,效果明显,为稀土在中、高钛硬质合金中的应用探索了一条新路。文中还对稀土的强化机理进行了阐述。     

桂林地区轻工企业亏损原因及其对策

桂林地区轻工企业亏损原因及其对策蒋勇（桂林地区轻工总会桂林５４１０００）轻工业是我国国民经济的重要组成部分，是消费品工业的主体。它在桂林地区是主导工业，是财政收入的重要来源。据统计，１９９６年桂林地区轻工业全行业完成工业总产值１９亿元，比上年增长４６...