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31.
《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2007,39(5):661-667
Monthly median values of foF2, hmF2 and M(3000)F2 parameters, with hourly time interval resolution for the diurnal variation, obtained with DPS-4 digisonde observations at Hainan (19.4°N, 109.0°E) are used to study the low latitude ionospheric variation behavior. The observational results are compared with the International Reference Ionospheric Model (IRI) predictions. The time period coverage of the data used for the present study is from March 2002 to February 2005. Our present study showed that: (1) In general, IRI predictions using CCIR and URSI coefficients follow well the diurnal and seasonal variation patterns of the experimental values of foF2. However, CCIR foF2 and URSI foF2 IRI predictions systematically underestimate the observed results during most time period of the day, with the percentage difference ΔfoF2 (%) values changing between about −5% and −25%, whereas for a few hours around pre-sunrise, the IRI predictions generally overestimate the observational ones with ΔfoF2 (%) sometimes reaching as large as ∼30%. The agreement between the IRI results and the observational ones is better for the year 2002 than for the other years. The best agreement between the IRI results and the observational ones is obtained in summer when using URSI coefficients, with the seasonal average values of ΔfoF2 (%) being within the limits of ±10%. (2) In general, the IRI predicted hmF2 values using CCIR M(3000)F2 option shows a poor agreement with the observational results. However, when using the measured M(3000)F2 as input, the diurnal variation pattern of hmF2 given by IRI2001 has a much better agreement with the observational one with the detailed fine structures including the pre-sunrise and post-sunset peaks reproduced reasonably well. The agreement between the IRI predicted hmF2 values using CCIR M(30,000)F2 option and the observational ones is worst for the afternoon to post-midnight hours for the high solar activity year 2002. During daytime hours the agreement between the hmF2 values obtained with CCIR M(30,000)F2 option and the observational ones is best for summer season. The discrepancy between the observational hmF2 and that obtained with CCIR M(30,000)F2 option stem from the CCIR M(3000)F2 model, which does not produce the small scale structures observed in the measured M(3000)F2. 相似文献
32.
提出了一种用等效扇面方法对蛇形搜索航行鱼雷攻击有利提前角的解算方法,并通过仿真对模型进行了修正。仿真结果表明,经修正后的鱼雷可达到最大命中概率。 相似文献
33.
34.
The architecture of digital sheet metal manufacturing system is proposed based on the classification of sheet metal manufacturing information.The essence of digital manufacturing is the definition,management and transfer of information,and the key technologies are brought forward and described.It is pointed out that knowledge-based manufacturing elements design is necessary to make digital technology efficient.The management of all kinds of sheet metal manufacturing element information is to build single source of manufacturing data.Multi-state model-based digital transfer and coordination method is designed to provide a foundation for digital manufacturing of aircraft sheet metal part.The application of digital sheet metal manufacturing is exemplified with an aircraft sheet metal part.The application result is compared to that of the traditional analog transfer technology.It is shown that the developed technology can improve part quality,shorten manufacturing time and lower manufacturing cost. 相似文献
35.
基于特征模型的全系数自适应控制系统稳定性研究 总被引:1,自引:0,他引:1
讨论了基于特征模型的黄金分割加逻辑微分自适应控制律组成闭环系统的稳定性问题。针对参数未知、线性定常或慢时变的二阶不稳定对象,本文给出了在采样周期满足一定条件下,上述闭环系统渐近稳定的充分条件,其中包含对于时变参数变化范围和非线性阻尼系数的约束条件。 相似文献
36.
蒋元兴 《北华航天工业学院学报》2006,16(6):30-32
对科研生产一体化事业部人力资源评价进行了探讨与研究,在对人力资源状况进行具体分析的基础上,给出了其评价指标体系,并采用层次分析法理论对其评价模型进行了权重确定.通过案例分析,提出了科研生产一体化人力资源评价的改进方向. 相似文献
37.
根据箱式发射导轨与导弹,导弹与折叠翼的约束特点,应用动力学普遍定理和解除约束原理,创建了离箱扰动运动数学模型和拆卸叠翼展开过程计算数学模型,并将计算结果与飞行试验结果作了比较。 相似文献
38.
基于有限元法的隧道荷载模型位移反分析 总被引:1,自引:0,他引:1
李誉 《中国民航学院学报》2006,24(1):42-45
介绍了一种以荷载模型为求解对象的位移反分析法。它是以通用有限元软件为实验平台,利用隧道位移实测值建立荷载灵敏系数方程,根据最小二乘法原理反求隧道模型的荷载,再将正分析结果和实际值进行对比分析井重新调整隧道荷载模型,最终获得较为符合实际的隧道荷载模型。该方法的优点是既考虑了岩土松动荷载效应又能体现支护结构与周围岩土体的共同作用,且具有较好的操作性。 相似文献
39.
秦翠霞 《沈阳航空工业学院学报》1997,14(4):80-84
本文从我国产业结构调整的现状及存在的问题出发,针对一般加工产业生产能力过大,高水平的加工能力不足这一突出问题进行了原因分析,在此基础上,就我国加速优化产业结构的客观基础和可能,提出了关于加大产业结构调整力度的七点思考建议。 相似文献
40.
OPTIMUMGRASPINGPLANNINGFORMULTIFINGEREDDEXTROUSHANDSBASEDONTHEASYMPTOTICALSTABILITY¥YangYang;LuZhen;ZhangQixian(RoboticsResea... 相似文献