芦芽山自然保护区生态旅游客源特征分析

生态旅游给自然保护区的发展赋予了新的机遇。芦芽山自然保护区具有丰富的生态旅游资源，但其具有明显的季节性。旅游市场以太原，大同和忻州区为主，25岁－45岁的游客占有绝对优势，大部分游客月收入400元－800元，其职业为工人，干部和教师为主，学历以高中以上为主，这不仅与游客的经济和社会地位相适应，而且与芦芽山的旅游品牌相一致。     

张力减径机孔型设计系统

主要研究开发了钢管张力减径机减径过程的传统孔型、圆孔型、椭圆孔型的设计系统 ,研究了有关孔型设计过程的优化问题 ,成功地为钢管生产厂家提供一套张力减径机孔型自动设计系统 ,有效地提高了工作效率和设计的可靠性     

一种基于自校准技术的信号采集系统

介绍一种基于自校准技术的信号采集系统 .该系统能消除温度漂移与时间漂移引起的误差 .系统电路简洁、实用 ,达到较高的精度     

斜交因子分析中一种因子变换的新方法

提出了一种在斜交因子分析中使尽可能多的因子变为 0 (或接近于 0 )的新的变换方法 .它不同于常用的因子旋转方法 ,其主要方法是将斜交因子变换矩阵的逆矩阵T- 1中的行向量单独考虑 ,使其有尽可能多的出现 0 (或接近于 0 ) .     

线阵CCD图像减影技术实现抛射物体轨迹实时检测

为对抛射物体的运动进行分析 ,克服使用高速录像并逐帧分析像片图像的方法需要较长的后期分析时间 ,不便于对结果进行自动快速分析的缺点 ,论文基于抛射物体的运动学规律 ,通过在抛射曲线上的两个固定点的高度和跨越时间的检测 ,获得了抛射物的初始角度和初始速度。对高度和时间的检测 ,采用了线阵电荷耦合器件 (CCD)为图像传感器进行摄像并采用图像减影的方法识别抛射物体。在对系统进行静态标定的基础上 ,在抛射架上进行了抛射实验检测。用该文提供的方法和用录像检测方法对不同条件下的初始发射角和初速度进行检测 ,二者数据符合得很好     

一种新型的计算机温度检测系统

论述了一种新型的两级总线型电子冷藏箱生产线系统 ,介绍了该系统的技术性能和特点 ,指出了其应用推广的价值     

利用单片机实现对水泥试体切削刀具的电气控制

为了实现对某一特定设备进行顺序开关控制 ,在电气控制设计的理论及方法中 ,利用单片机手段来实现。文章针对水泥试体切削过程中所包含的多道步序 ,且步序间为串行流程的条件步进控制问题 ,分别从刀具多机拖动的互锁与联动、刀具的进程检测与驱动、系统的可靠性与安全性等几个方面详细介绍了利用单片机来实现的有效方法。方法简单 ,适用于条件步进控制 /时间步进控制的一类应用问题。     

Experimental study on patterns of fault interaction

Based on the data of strain field, fault slip and acoustic emission during the deformation of some fault models, the fault interaction patterns are studied. The experiments reveal four patterns of fault interaction, i.e. static promotion or delay of earthquake, creep triggering, dynamic triggering and dynamic loading-relaxation. Promotion and delay of earthquake caused by fault interaction and mechanical property of fault combinations are preliminarily analyzed from the perspective of series and parallel connection of faults, and the relationship between patterns of fault interaction and mechanical and material properties of fault is discussed.     

Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning,China:New 40Ar/39Ar dating of the Yixian and Tuchengzi Formations

We report new 40Ar/39Ar dating results obtained from total fusion and incremental-heating analyses of sanidine and biotite from three tuffs found interbedded within the fossil-bearing deposits of Liaoning, northeast China. The first is a new sample of the Bed 6 Sihetun tuff from the Yixian Formation, previously dated by our team as middle Early Cretaceous, and recently considered by Lo et al., partially reset due to metamorphism from a nearby basaltic sill. The second is the Yixian Bed 9 tuff from Hengdaozi considered by Lo et al. to be unaffected by metamorphism and whose age, based on total fusion 40Ar/39Ar dating of biotite, argues for a Jurassic age for the Yixian Formation.The third tuff is a previously undated tuff from the upper part of the underlying Tuchengzi Formation. Single crystal total fusion 40Ar/39Ar analyses of the Sihetun sanidine showed homogeneous radiogenic Ar, Ca/K ratios, excellent reproducibility and gave a mean age of 125.0 ± 0.18 (1SD) ±0.04 (SE) Ma. Single sanidine crystal total fusion 40Ar/39Aranalyses of the Hengdaozi tuff gave a mean age of 125.0 +0.19 (1SD) ± 0.04 (SE) Ma, which is indistinguishable from the Sihetun tuff. The Tuchengzi Formation tuff gave a mean age of 139.4 ± 0.19 (1SD) ± 0.05 (SE) Ma. Detailed laser incremental-heating analyses of biotite from Sihetun, Hengdaozi, and Tuchengzi tuffs show disturbed Ar release patterns and evidence of trapped argon components. We conclude from these analyses that the total fusion dates on biotite by Lo et al. are erroneously old and isotopic dating of both biotite and sanidine from tuffs of the Yixian Formation point to a middle Early Cretaceous age. The upper part of the Tuchengzi Formation can be referred to the Early Cretaceous.``     

Analysis of EET on Ca increasing the melting point of Mg17Al12 phase

The present investigation showed that the additions of Ca to the alloy AZ91 were mainly dissolved into the Mg17Al12 phase and increased its melting point and thermal stability, which would have great effects on the high- temperature properties of AZ91 alloy. The empirical electron theory (EET) of solid and molecules was used to calculate the valence electron structures (VES) of Mg17Al12 intermetallic compound with and without Ca addition. The results showed that Ca dissolving in Mg17Al12 phase increased the strength of bonds that control the thermal stability of Mg17Al12 phase. Additions of Ca also made the distribution of the valence electrons on the dominant bond network more uniform in the whole unit cell of Mg17Al12. The theoretical conclusions well account for the experimental results.