高层住宅的通风与排烟道烟气倒灌系统的分析

我国高层住宅排烟道在并联多个排油烟机且不设总排风机的工况下,尚存在防烟气倒灌能力低的问题。目前,推出一种内置引射诱导器的通风排烟系统,并由国家空调设备质量检测中心实地进行空气动力性能检测,证明其防烟气倒灌的效果比较好。     

维吾尔族和汉族对“民考汉”的评价与看法的比较研究

文章通过比较维吾尔族和汉族对“民考汉”的评价与看法,探讨了维吾尔族和汉族对“民考汉”的评价的差别。     

A new control law based on characteristic exponent assignment for libration point orbit maintenance

A new method is developed for stabilizing motion on collinear libration point orbits using the formalism of the circular restricted three body problem. Linearization about the collinear libration point orbits yields an unstable linear parameter-varying system with periodic coefficients. Given the variational equations, an innovative control law based on characteristic exponent assignment is introduced for libration point orbit maintenance. A numerical simulation choosing the Richardson＇s third order approximation for a halo orbit as a nominal orbit is conducted, and the results demonstrate the effectiveness of this control law.     

悬浮振子对中耳声传播特性影响的数值研究

为研究悬浮式中耳植入式助听装置中悬浮振子对中耳声传播特性的一些影响,建立了包括绑定悬浮振子的中耳有限元模型. 该模型基于一无任何听力损伤病史的成年志愿者的左耳,利用CT扫描和逆向成型技术建成. 模型的可靠性通过鼓膜及镫骨底板的位移计算结果与国外文献实验测得数据进行对比加以验证. 研究结果表明:悬浮振子的绑定会显著恶化中耳的高频传输特性;振子输出8.9\times10^5N的激振力才能激起100dB声压所对应的激振效果;振子在砧骨长突上的绑定位置离砧镫关节越近,高频段激振效果越好.      

On the behaviour characterization of metallic cellular materials under impact loading

This paper reviews the common mechanical features of the metallic cellular material under impact loading as well as the characterization methods of such behaviours. The main focus is on the innovations of various testing methods at impact loading rates.Following aspects were discussed in details.（1） The use of soft nylon Hopkinson/Kolsky bar for an enhanced measuring accuracy in order to assess if there is a strength enhancement or not for this class of cellular materials under moderate impact loading;（2） The use of digital image correlations to determine the strain fields during the tests to confirm the existence of a pseudo-shock wave propagation inside the cellular material under high speed impact： （3） The use of new combined shear compression device to determine the loading envelop of cellular materials under impact multiaxial loadings.     

Delayed feedback control experiments on some flexible structures

In recent decades,studies on delayed system dynamics have attracted increasing attention and advances have been achieved in stability,nonlinearity,delay identification, delay elimination and application.However,most of the existing work is on the theoretical basis and little is on the experiment.This paper presents our experimental studies on delayed feedback control conducted in recent years with the focus on the discussion of a DSP-based delayed experiment system.Some phenomena in our delay experiments are discussed and a few topics of interest for further research are brought forward.     

紫外聚合高吸水高耐盐性聚丙烯酸盐树脂的制备研究

紫外（UV）光聚合法合成超高强吸水高耐盐性聚丙烯酸盐,对比于传统的聚合方法具有工艺过程简单、反应时间短、易操作、可在常温下进行以及无三废污染等优点．本文研究了中和度、光照时间、NaOH与KOH的比值、交联剂含量等因素对聚丙烯酸盐吸水性的影响．结果表明,在NaOH：KOH=1：1,交联剂3％,中和度为77．5％,光照时间为20min时合成的聚丙烯酸盐吸水树脂具有很高的吸水率和很好的耐盐性．吸去离子水率为3563g／g,吸生理盐水（0．9％NaCl水溶液）率为212g／g．     

含纯粹分布时滞的Lotka-Volterra两种群合作系统的正周期解(英文)

研究了含有纯粹分布时滞的Lotka-Volterra两种群合作系统的正周期解.基于Gaines和Mawhin的叠合度定理,我们给出了含有纯粹分布时滞的Lotka-Volterra两种群合作系统的新的正周期解存在性的充分条件.     

直观随机赋范空间中三次泛函方程的稳定性

先引入直观随机赋范空间的概念．然后,借助这一概念,然后对任意的三角范数在该空间的框架下,研究了三次泛函方程的稳定性．另外,还介绍了随机空间理论、直观空间理论及泛函方程理论间的密切关系．     

证券组合的Markov链模型

本文将证券价格时间序列分解成趋势变动序列和 Markov链 ,建立了证券组合的 Markov链模型 ,应用 Markov链理论对此模型进行了分析 ,给出了充分大的一个时间内的收益率 ,风险和切点组合的计算公式