排序方式: 共有19条查询结果,搜索用时 15 毫秒
1.
为提高铝粉能量释放速率,分别通过置换和先置换后化学镀的方法将微米铝表面的惰性氧化铝层替换为导热系数更高的钴壳层,得到钴壳层厚度分别为90,150,200,250 nm的Al@Co核壳含能粒子,并对其进行扫描电镜、透射电镜、能量色散谱、振动样品磁强计,以及热性能测试。结果表明,钴壳层致密均匀、厚度可控,且随着钴壳层厚度增加,粒子的自然抗氧化能力逐渐增强;各粒子表现出典型的铁磁滞回线,进一步证实了铁磁性物质钴的存在;包覆有200 nm钴壳层的Al@Co核壳含能粒子完全克服铝粉吸热,对外表现为剧烈放热,放热量为521.40 J·g-1,是一种有潜力的新型绿色起爆药燃料组分。 相似文献
2.
3.
4.
使用热分析仪器和AKTS热分析模拟软件研究了烟花爆竹药剂热分解的过程,得出了烟花爆竹药剂的活化能和反应相关系数随反应进程变化的曲线,进一步算出药剂在24 h内能够完全反应的最高环境温度(T24 h)和自加速分解温度(SADT),为防止烟花爆竹发生爆炸事故提供了理论依据. 相似文献
5.
Analysis of Controlled Trajectory Optimization for Canard Trajectory Correction Fuze 总被引:1,自引:0,他引:1
The optimization method of the canard trajectory correction fuze‘s controlled trajectory phase is researched by using the aerodynamics of aerocraft and the optimal control theory, the trajectory parameters of the controlled trajectory phase based on the least energy cost are determined. On the basis of determining the control starting point and the target point, the optimal trajectory and the variation rule of the normal overload with the least energy cost are provided, when there is no time restriction in the simulation process. The results provide a theoretical basis for the structure design of the canard mechanism. 相似文献
6.
7.
8.
To analyze factors that affect the detection probability of six laser range-finders of rotating rocket, taking a missile as the target, the detection model was established according to a detection mechanism. Based on the model, the detection probability was calculated via Monte Carlo method under different conditions. With the calculation results, the relationship of detection probability with the rolling rate and the missile velocity was illustrated in figures, when the laser emitting frequency was 10 kHz, 20 kHz, 30 kHz respectively under the condition that rocket met the front of missile as well as the condition that rocket met the rear of missile. The figures show that the detection probability increases as laser emitting frequency increases or the rolling rate increases, while it decreases as the missile velocity increases. Detection probability is higher when rocket meets the front of missile than that when rocket meets the rear of missile. In order to maintain a track of approaching Mach 2 targets, rotation rate should be more than 100 r/s. 相似文献
9.
二氯-4,5-二氮芴-9-酮作为1,10-邻二氮杂菲的衍生物,能与Pd(Ⅱ)等金属离子形成配合物,研究表明,其具有丰富的二维或三维的空间结构特点,在共轭环间的π-π堆积下其有序的堆积结构可能产生具半导体性质,但对它及它的取代衍生物的导电性研究还未有相关报道.采用Materials Studio4.0软件中的CASTEP软件的LDA/CA-PZ法,计算二氯-4,5-二氮芴-9-酮合钯(Ⅱ)及其卤素取代衍生物的晶体优化构型、能带结构和态密度,结果表明,卤素原子较趋于取代分子γ位的氢原子.PddafoCl2及其卤素取代衍生物晶体的禁带宽度在(1.1691~1.5221)eV间,显示该系列物质均具有半导体属性.引入卤素取代基显然降低了体系的禁带宽度,同时提高了态密度,增强导电性质.其中以碘原子α取代衍生物的禁带最窄,态密度最大.引入不同的卤索取代基,配合物呈现不同的导电性,导电性的改变对于非线形光学材料及磁性材料方面等有很重要的研究意义,二氯-4.5-二氨芴-9-酮合钯(Ⅱ)及它的卤素取代衍生物将在不同的领域获得广泛的应用. 相似文献
10.