Analysis of the ionospheric variability based on wavelet decomposition

In this work,the ionospheric variability is analyzed by applying the wavelet decomposition technique to the noontime fo F2,F10.7,interplanetary magnetic field(IMF)Bz,Ap,and lower thermospheric temperature at pressure of 10?4 h Pa in 2002.Results show that the variance of periodic oscillations in the ionosphere is largest in the 2–4-day period and declines with the increase of the period.The maximum variance of the periodic oscillations in solar irradiation is in the 16–32-day period.For geomagnetic activities,most of the variance is about equally distributed on intervals of periods shorter than 32 days.Variance distributions of IMF Bz and lower thermospheric temperature are similar to those of the ionosphere.They show the maximum in the 2–4-day period and decline with the increase of the period.By analyzing the distributions of the variances,the potential connections between the ionosphere and the external sources are discussed.     

用LabVIEW演示PID控制规律

利用虚拟仪器技术,采用LabVIEW图形编程环境,设计了一个程序,用于演示PID控制规律,可将其用于教学中,以此为例说明LabVIEW对传统教学方法所带来的巨大变化.     

气动贯通式潜孔锤反循环连续取心取样钻进新技术在河南钼矿中应用

三道庄钼矿勘探生产中钻遇的地层非常复杂，采用其他方法均无法实现钻进，经过分析比较，决定采用贯通式潜孔锤反循环连续取心（样）钻进新技术来解决该地层钻进难、成孔难、取样难等三大问题。文章从钻进技术特点、工作原理等方面对该技术进行详细分析，得出其具有钻进效率高、岩心（样）采取率高、成孔质量好等突出优点。并介绍了钻进主要设备机具的配套、施工工序、操作要点、遇到问题的解决方法等。在河南钼矿露天采石场应用该项技术，有效避免了塌孔和卡钻事故，工程进展顺利、质量好、岩心（样）采取率在98％以上，取得了良好的效果。针对在生产试验中遇到的某些问题，作者提出了一些改进建议。     

电磁超声流量计的研制

基于电磁声换能器的原理，研制了一种新型的电磁超声流量计，并讨论提高测量精度的措施。     

风扇磨煤机ZGMn13冲击板的失效分析

ZGMn13冲击板的失效方式为不同角度的粒子撞击和冲刷，其表面可以分为三个典型的磨损区域：低角度撞击区、高角度撞击区和冲刷区。详细分析了该三个磨损区域的磨损机理。次表面分析的结果表明，在低负度撞击和冲刷条件下，高锰钢未能充分加工硬化，耐磨性提高有限。     

N,N''-取代邻苯二胺的合成

通过2-取代苯并咪唑盐的还原开环反应制备了8个N,N′-不同取代的邻苯二胺,并经1HNMR、IR、MS及元素分析表征,其中5个未见文献报道.这是一条由邻苯二胺和羧酸经2.取代苯并咪唑制取该类化合物的简洁合成路线.     

微波-表面活性剂协同提取万寿菊叶黄素工艺研究

以提高万寿菊叶黄素的提取率为目的,采用单因数实验结合正交实验的方法.研究了微波-表面活性剂协同提取万寿菊花中叶黄素的丁艺.结果表明:万寿菊叶黄素的微波-表面活性剂协同提取最优工艺为:以乙酸乙酯为提取剂,表面活性剂Tween-20为最佳助萃取剂(质量分数为0.03%),提取固液比1∶60(g/mL),微波功率400 W,微波提取温度为60℃,提取时间2 min.在此工艺下,万寿菊叶黄素的提取量为3.209 mg/g.     

关于普通高校课堂教学规律的探讨

课堂教学是教学的基本形式,课堂教学规律就是人的认知规律。只有按照这一认知规律去组织教学,并努力提高课堂教学实效,才能真正完成教学任务,达到培养人才的目的。本文论述了普通高校课堂教学的一般规律。     

关于木糖(醇)生产过程中环保、清洁、节能生产方法的研究

本文从环境保护角度,面对木糖(醇)生产过程中大污染、高能耗,寻找解决办法,实现可持续发展的目标.     

Photoluminescence and X-ray Diffraction of Distributed Bragg Reflector

Spectral and structural characteristics of distributed Bragg reflector (DBR) in vertical-cavity surface-emitting lasers were studied with photoluminescence and double- crystal X- ray diffraction measurement. The expected high quality epitaxial DBR structure was verified. In the X- ray double- crystal rocking curves of DBR the zeroth- order peak, the first and second order satellite peaks were measured. Splitting of diffraction peak appeared in the rocking curves was analyzed. The effects of introduced deep energy levels on the structural perfection and optical properties were discussed.