基于MSC Marc的空气弹簧垂向特性有限元分析

介绍不同类型的空气弹簧结构型式,利用有限元软件MSC Marc 建立空气弹簧的有限元模型,并对其进行垂向特性的分析和计算. 最后得出空气弹簧垂向刚度非线性特性的确切描述,并分析传统的弹簧与空气弹簧自振频率随载荷变化的特性.     

关于Java安全与性能之权衡分析

Java是目前最流行的编程语言之一，它在网络上的安全性是无可比拟的，但由此带来了性能上的影响，在这里，首先介绍其安全机制，再对性能上的原因进行分析，最后给出一些提高性能的安全性方法。     

乙醇和PVA的光助Fenton降解机理

Contrast degradation experiments between ethanol and polyvinyl alcohol (PVA) were conducted during H2O2, UV/H2O2, Fenton, and Photo-Fenton processes in this study. UV/VIS spectra showed: that complexes between Fe(Ⅲ) and organics were easily formed and degraded within reaction time. Compared with.the degradation of complex, hydroxyl radicals acted weakly in Fenton or Photo-Fenton process. Hydroxyl radicals involved in Photo-Fenton process were deemed to be generated from the split decomposition of H202, photolysis of Feaq^3 , and degradation of hydrated Fe(IV)-complex but not traditional Fenton reaction. Experimental evidence to support this point was presented in this paper.     

国内常用加拿大长纤维木浆的技术分析

详细论述了国内常用的原产加拿大漂白长纤维硫酸盐木浆(NBSK)和本色硫酸盐木浆(UKP)的制浆树种、纤维形态特征、技术指标,并对相同游离度、不同种类的长纤维木浆成纸物理性能指标进行分析对比.     

车用焦炉气脱苯、脱萘技术初步研究

针对焦炉气作车用燃料苯、萘含量超标的问题,对焦炉气进行了深度脱苯脱萘处理。在焦化企业对焦炉气初步净化处理的基础上,采用轻柴油洗萘工艺对焦炉气进行进一步的脱萘处理。处理后的焦炉气中,萘的质量浓度降低至50 mg/m3以下;苯也部分溶解于轻柴油,质量浓度进一步降低到2 g/m3以下。净化后的焦炉气可满足焦炉气汽车的使用要求。     

小套管固井技术在吐哈油田套损井中应用

吐哈油田分公司丘陵油田地层复杂,并且普遍采用高压注水、压裂、酸化等增产措施进行开采,导致套管变形较严重,并且部分套损井变形点较多、变形段较长,严重影响了油田的开发。吐哈油田采用小套管悬挂固井技术成功解决了对深井长变段、多点变形无法修复的难题,现场应用较好,为油田套损井治理探索出一套新工艺。     

“教学相长”在数字电路实验设计的实践

所谓“教学相长”意味着教师的“教”与学生的“学”可以相互促进；在大学工科教育中,“教学相长”的实践有助于启发学生的自主思考能力。以基于FPGA的“电子连环”数字电路实验设计为例,说明“教学相长”过程在“数字电路与系统”课程中持续地改进了数字逻辑知识和硬件描述语言设计的教学内容。     

Nonlinear phenomena in dielectric barrier discharges: pattern,striation and chaos

The nonlinear phenomenon is very popular in dielectric barrier discharge (DBD) plasmas. There are at least three kinds of spatial and temporal nonlinear phenomena appearing synchronously or asynchronously in DBDs, i.e. self-organized patterns, striations and chaos. This paper describes the recent research and progress in understanding the nature of these nonlinear phenomena. Patterns are macroscopic structures with certain spatial and/or temporal periodicities generated through self- organization of microscopic parameters. The physics of patterns in DBDs is mainly associated with lateral dynamic behaviors or the lateral non-local effect of charged particles resulting in the lateral development or non-uniformity of discharge. Striations are ionization waves with unique properties determined by transport phenomena, ionization processes and electron kinetics in current-carrying plasmas. The physics of striations in DBDs is mainly associated with the advances in non-local electron kinetics in spatially inhomogeneous plasmas. Chaos is a kind of random and non-periodic phenomenon occurring in a determined dynamic system, following a series of certain rules while exhibiting random locomotion, and is regarded as an intrinsic and ubiquitous phenomenon in a nonlinear dynamic system. An evolution trajectory including period-doubling bifurcation to chaos was observed in DBDs or DBD-derived plasmas. In a common sense, it is believed that the formation of all the three nonlinear phenomena in a DBD system should be related to the non-local transversal and/or longitudinal dynamics of space charges (i.e. non-local effect) or the localized electric field interaction. Future work is still needed on the underlying physics and should be directed to pursuing the unification of these nonlinear phenomena in DBD.     

纯电动厢式运输车动力传动系统传动比优化

针对某款纯电动厢式运输车在山区城市道路行驶爬坡能力不足问题,对影响整车性能的动力系统主要部件参数匹配方法进行分析,以续驶里程为约束,以提高最大爬坡度为目标,采用DOE正交试验法对传动系统传动比进行优化,运用Cruise软件建立整车模型,对优化前、后动力性能进行对比仿真分析,结果表明:优化后,纯电动厢式运输车爬坡能力明显增强,且加速性能略有提升。     

一线消防员心理素质结构分析

采用问卷调查法,对在灾害现场承担任务的消防员应具备的心理素质进行分析,总结出了影响一线消防员心理素质的因素,分别是情绪意志、专业技能、职业情操、思维能力和个性倾向。通过建立和分析心理素质结构模型,得到了一线消防员心理素质结构的共性和个性因素。