混合遗传算法在弹箭气动参数优化的应用

弹箭气动参数是影响弹箭飞行运动的重要因素,因此获取准确的弹箭气动参数对弹箭的研制极为重要。在射击实验之后,弹箭参数的辨识实际上就是一个参数优化的过程,但是传统的优化方法在弹箭气动参数优化过程中,很容易陷入局部最优解,而无法准确得出参数,同时遗传算法具有很好的全局优化能力,但是在局部寻优上很慢,因此将二者相结合形成的混合遗传算法来进行弹箭参数优化,效果比单一算法好。     

吉林西部土壤微量营养元素有效量及其影响因素

通过对吉林西部3个工作区土样的微量营养元素全量、有效量以及土壤pH值和有机质含量的测定,分析了土壤微量营养元素有效量特征及其影响因素。结果表明,吉林西部有效B基本不缺乏;有效Mn含量极丰富;有效Cu含量农安极丰富,明显高于其他2区,大安有效Cu含量样点间差异较大;土壤有效Zn基本不缺乏;有效Mo严重缺乏,且地区差异性较大;吉林西部有效Fe含量极丰富。土壤有效Mn、Cu和Fe含量受全量控制;B、Zn元素有效量受土壤pH值的制约;土壤有机质则与有效Mn和Fe呈极显著正相关。     

吉林西部土壤微量营养元素有效量及其影响因素

通过对吉林西部3个工作区土样的微量营养元素全量、有效量以及土壤pH值和有机质含量的测定,分析了土壤微量营养元素有效量特征及其影响因素结果表明,吉林西部有效B基本不缺乏;有效Mn含量极丰富;有效Cu含量农安极丰富,明显高于其它2区,大安有效Cu含量样点间差异较大;土壤有效Zn基本不缺乏;有效Mo严重缺乏,且地区差异性较大;吉林西部有效Fe含量极丰富.土壤有效Mn、Cu和Fe含量受全量控制;B、Zn 元素有效量受土壤pH值的制约;土壤有机质则与有效Mn和Fe呈极显著正相关. Abstract： Based on the assay of the total content and available content of the trace nutrient elements and the soil pH and organic matter of the soil samples,the characteristic of the available content of the trace nutrient elements and their affecting factors are studied.The results show that the available B in western Jilin is in a middle level,the content in Nong'an is higher than that in the others;the available Mn is extremely abundant;the available Cu in Nong'an is obviously higher than other areas,and the content in Da'an differs greatly;the available Zn is in a middle level;the severe shortage of available Mo differs between different areas;and the available Fe is extremely abundant.The available Mn,Cu and Fe have significantly positive correlation with their total content;the available B has significantly positive correlation with pH,and Zn has obviously negative correlation with pH;the available Mn and Fe had significantly positive correlation with soil organic matter.