光学纤维面板熔压设备的研究与开发

为解决生产光学纤维面板的传统熔压设备存在的控制精度低和重复精度低的问题,基于液压比例反馈技术和传感器检测技术,开发了一种光学纤维面板自动熔压设备.介绍了其熔压原理、工艺流程及结构特点,并对设备改造的核心部分液压控制系统的原理进行了详细的说明.实验测试结果表明:该设备自动化程度高,工艺参数控制精度不低于国内外同类先进设备,温度控制精度达±0.1℃,真空度控制精度为±2 Pa,压力控制精度达±1%,为光纤面板加工和工艺研发提供了一种新的手段.     

基于Rough Sets-C4.5的故障征兆提取与判别

针对原始信息系统往往存在大量重复样本和冗余属性,从而影响实际故障诊断的精度和速度这一问题,介绍了一种基于粗糙集和决策树C4.5算法相融合的故障诊断模型,用于设备的精确和快速故障诊断.利用粗糙集具有较强的处理不确定和不完备信息的能力,对原始样本集进行离散化及约简处理;同时,利用决策树C4.5算法对约简后的决策表进行快速学习并形成树状故障分类器.以实例介绍了利用该模型进行故障诊断的完整过程.     

Ice growth in supercooled solutions of antifreeze glycoprotein

Inhibition of ice growth in supercooled solution by certain proteins is vital to the survival of many living organisms. Some fish, native to both subzero northern and southern waters, have special proteins or glycoproteins in their blood serum that inhibit ice formation. Whereas these proteins have only a very small effect on the melting temperature of ice, the temperature of these fish can fall to nearly 1 K below the melting point before ice crystals grow. This phenomenon is called freezing hysteresis, in contrast to the normal colligative effect of solutes that depresses the equilibrium temperature, around which small changes lead to crystal growth or melting depending on sign. Some insects also exhibit a serum freezing hysteresis. We report the effects of different degrees of supercooling on the habit and rates of growth of ice crystals from solutions of these antifreeze glycoproteins (AFGPs). We find that the crystallization rate is up to five times greater than that in pure water.     

赛罕乌拉自然保护区珍稀野生动物多样性及动态监测初探

2006年对赛罕乌拉国家级自然保护区的珍稀野生动物种类与数量进行了监测调查,发现3种鸟类新记录,使本地区国家级保护鸟类达到31种,3种珍稀兽类数量增加.结合以往资料分析了珍稀野生动物的生存现状,比较了不同时期野生动物的种类和数量变化特点,得出保护区内的珍稀野生动物得到了有效保护,物种和数量均有一定程度增加.提出了在保护区内中实施珍稀野生动物种群数量长期动态监测的方案.     

单位宽度轧制力对热轧带钢凸度的影响规律

为了建立高精度的热轧带钢凸度计算数学模型 ,根据带钢凸度计算理论 ,采用影响函数法开发了四辊轧机带钢凸度影响率计算软件 ,系统地分析了单位宽度轧制力、轧辊直径和压下量对单位宽度轧制力影响率的影响规律·结果表明单位宽度轧制力影响率随带钢宽度的增加呈抛物线变化 ;轧辊直径和压下量对单位宽度轧制力影响率有一定的影响 ;建立了高精度单位宽度轧制力影响率的数学模型 ,确定了单位宽度轧制力影响率基本值及工作辊直径、支撑辊直径、压下量对单位宽度轧制力影响率修正系数的 6次拟合系数 ,为板形控制系统模型的建立及参数优化提供了理论依据     

基于IMM的高动态GPS接收机载波跟踪算法

利用交互式多模型的带宽自适应调整特性实现了高动态与静态环境下通用的GPS信号载波跟踪算法。仿真结果表明,该算法在保证满足高动态GPS信号载波跟踪要求的前提下,降低了静态时的频率跟踪误差,避免了不同动态环境下多个载波跟踪算法及切换方案的设计。     

Mutation of the gene encoding the ROR2 tyrosine kinase causes autosomal recessive Robinow syndrome

Robinow syndrome is a short-limbed dwarfism characterized by abnormal morphogenesis of the face and external genitalia, and vertebral segmentation. The recessive form of Robinow syndrome (RRS; OMIM 268310), particularly frequent in Turkey, has a high incidence of abnormalities of the vertebral column such as hemivertebrae and rib fusions, which is not seen in the dominant form. Some patients have cardiac malformations or facial clefting. We have mapped a gene for RRS to 9q21-q23 in 11 families. Haplotype sharing was observed between three families from Turkey, which localized the gene to a 4. 9-cM interval. The gene ROR2, which encodes an orphan membrane-bound tyrosine kinase, maps to this region. Heterozygous (presumed gain of function) mutations in ROR2 were previously shown to cause dominant brachydactyly type B (BDB; ref. 7). In contrast, Ror2-/- mice have a short-limbed phenotype that is more reminiscent of the mesomelic shortening observed in RRS. We detected several homozygous ROR2 mutations in our cohort of RRS patients that are located upstream from those previously found in BDB. The ROR2 mutations present in RRS result in premature stop codons and predict nonfunctional proteins.     

AB_g型树枝状高分子生长物理缺陷的理论研究

根据超支化高分子生长的空间位阻效应,通过利用简单的统计模型分析了ABg型反应体系在临界生长代数时形成缺陷结构的物理过程,进一步给出了临界反应代数与官能团之间的关系,扼要地讨论了超支化高分子的折光指数随生长代数的变化情况.