规则抽取的Fuzzy ARTMAP方法

着重阐述了如何使用有教师监督的自组织神经网络－模糊自适应共振映射网络（Ｆｕｚｚｙ ＡＲＴＭＡＰ）从例子中抽取知识规则。叙述了规则抽取中的两个细节：网络修剪，即删除那些对网络抽取规则贡献不大的节点及其相连的权值；权值的量化，以使系统最终能释译成一套可使用的规则。本文对Ｆｕｚｚｙ ＡＲＴＭＡＰ网络作了改进和简化，并用于医学上心电图（ＥＣＧ）信号中室性早搏（ＰＶＣ）诊断规则的自动获取，取得了比较满意的结     

COMPLEX NONLINEAR MATHEMATICAL MODEL FOR A KIND OF VEHICLE SHOCK ABSORBORS

０ＩＮＴＲＯＤＵＣＴＩＯＮＳｈｏｃｋａｂｓｏｒｂｅｒｓａｒｅｔｈｅｄａｍｐｉｎｇｅｌｅｍｅｎｔｓｉｎｖｅｈｉｃｌｅｓｕｓｐｅｎｓｉｏｎｓ．Ｔｈｅｐｅｒｆｏｒｍａｎｃｅｓｏｆｔｈｅｅｌｅｍｅｎｔｓｄｉｒｅｃｔｌｙａｆｅｃｔｔｈｅｒｉｄｅｃｏｍｆｏｒｔ...     

冲击波压力和脉冲持续时间对铁和镍微结构的影响

用一级轻气炮对铁和镍两种材料动态加载。用透射电镜观察两种材料的位错结构。结果发现：受动加载作用后铁和镍的位错结构分别是类似于网状的和网状的结构。冲击波压力与位错密度有直接关系，而在本试验的条件下脉冲持续时间对位错密度没有影响。     

Stereospecific formation of a ternary complex of (S)-α,β-fluoromethylene-dATP with DNA pol β

The influence of water: crystallization of (R/S)-α,β-CHF-dATP with the preorganized pol β-DNA complex shows that (S)-α,β-CHF-dATP is preferentially bound to the active site with the C=F fluorine proximal to a structural water bound to Asp276.     

柴油发动机气缸压力和燃烧始点的辨识

在柴油发动机气缸压力的识别过程中，针对缸盖振动信噪比较低的问题，提出了对RBF网络训练样本进行时域统计平均降噪的方法，同时在对燃烧始点的辨识中应用了Kaiser差分器。时域统计平均有效提高了信号的信噪比，对柴油发动机气缸压力的恢复获得了很好的结果；Kaiser差分器有效提高了对燃烧始点的辨识。通过实践证明，该计算方法可以有效地从柴油发动机缸盖振动信号恢复气缸压力，并进一步辩识燃烧始点。     

油膜振荡下转子疲劳的损伤力学研究

在对油膜振荡进行非线性动力学分析的基础上,将其动力学响应作为位移边界条件,把损伤引入到材料的本构关系当中,考虑损伤与应力、应变的相互影响,采用全耦合的损伤力学分析方法对转子在油膜振荡行为下的损伤发展过程进行了分析,揭示了转子在油膜振荡行为下的疲劳破坏机制;同时分析了损伤与应力、应变的耦合作用对损伤演化、发展的影响,为汽轮机组的灾变防治和安全设计提供了一定的理论依据。     

用于消除谐波干扰的Ｖ型滤波器的零极点配置设计方法

针对某设备振动模态测试中,市电对测试信息产生的５０Ｈz工频及其谐波干扰,设计了阻带带宽极狭窄（小于１Ｈz）的Ｖ型数字带虎波器,并完成了相应的数字滤波,Ｖ型数字滤波器物理意义清晰,设计和实现方法简单灵活,效果大大优于某些消除谐波干扰的算法,本文介绍了该Ｖ型滤波器的设计及实现方法。     

Nucleate boiling in binary mixturesEbullition nuclee dans les melanges binairesBlasensieden binärer gemischeПyзыpькoвoe кипeниe бинapныч cмeceй

It is well established that many parameters associated with nucleate boiling of a mixture differ significantly from those for a pure fluid of identical physical properties. Some authors attribute this difference to changes in bubble growth rates due, ultimately, to a resistance to the interdiffusion of the species. Others suggest that the change is due to differences in the superheat required to initiate bubble growth due, ultimately, to changes in the parameters governing the saturation pressure-temperature relationship.The latter theory is closely examined here and found to be untenable. It is, however, shown that in aqueous systems there may be an increase in the superheat required for the onset of nucleate boiling due to the effects of the change in wetting characteristics for organic solvents at low concentrations. Experimental data abstracted from the literature show that the diffusion resistance which is found once boiling has commenced still plays a significant role in the reduction in heat transfer in aqueous systems and it is presumed to be the controlling factor in non-aqueous systems.     

Antimony leaching from polyethylene terephthalate (PET) plastic used for bottled drinking water

Antimony is a regulated contaminant that poses both acute and chronic health effects in drinking water. Previous reports suggest that polyethylene terephthalate (PET) plastics used for water bottles in Europe and Canada leach antimony, but no studies on bottled water in the United States have previously been conducted. Nine commercially available bottled waters in the southwestern US (Arizona) were purchased and tested for antimony concentrations as well as for potential antimony release by the plastics that compose the bottles. The southwestern US was chosen for the study because of its high consumption of bottled water and elevated temperatures, which could increase antimony leaching from PET plastics. Antimony concentrations in the bottled waters ranged from 0.095 to 0.521 ppb, well below the US Environmental Protection Agency (USEPA) maximum contaminant level (MCL) of 6 ppb. The average concentration was 0.195+/-0.116 ppb at the beginning of the study and 0.226+/-0.160 ppb 3 months later, with no statistical differences; samples were stored at 22 degrees C. However, storage at higher temperatures had a significant effect on the time-dependent release of antimony. The rate of antimony (Sb) release could be fit by a power function model (Sb(t)=Sb 0 x[Time, h]k; k=8.7 x 10(-6)x[Temperature ( degrees C)](2.55); Sb 0 is the initial antimony concentration). For exposure temperatures of 60, 65, 70, 75, 80, and 85 degrees C, the exposure durations necessary to exceed the 6 ppb MCL are 176, 38, 12, 4.7, 2.3, and 1.3 days, respectively. Summertime temperatures inside of cars, garages, and enclosed storage areas can exceed 65 degrees C in Arizona, and thus could promote antimony leaching from PET bottled waters. Microwave digestion revealed that the PET plastic used by one brand contained 213+/-35 mgSb/kg plastic; leaching of all the antimony from this plastic into 0.5L of water in a bottle could result in an antimony concentration of 376 ppb. Clearly, only a small fraction of the antimony in PET plastic bottles is released into the water. Still, the use of alternative types of plastics that do not leach antimony should be considered, especially for climates where exposure to extreme conditions can promote antimony release from PET plastics.