Arcjet is one of the highlight of electric propulsion investigation and application because of its high thrust density, high ratio of thrust and power, preferable specific impulse, better system successiveness and reliability.
作为电推进的一种方式，电弧加热发动机以较高的推力/功率比、推力密度、中高的比冲、良好的系统继承性和可靠性等特点，成为当前国际研究和应用的热点。
At present, arcjet has been the highlight of investigation and application because of its high thrust density, high ratio of thrust and power, preferable specific impulse, better system successiveness and reliability.
电弧加热发动机以较高的推力/功率比、推力密度、中高的比冲、良好的系统继承性和可靠性等特点，已经成为当前国际研究和应用的热点。
The optimized geometry with 〓 symmetry is concavecage structure in which one N atom of each pentagon is concave rather than theconvex sphere of 〓 cluster. This concave-inward change is caused by therepulsion between the lone pair electrons of each nitrogen atom in the 〓.Estimates are given of the density of condensed-phase 〓, along with predictedvalues of its detonation velocity, detonation pressure and specific impulse.
由几何优化得到的构型得知，〓构型并不是〓构型那样的凸球面结构，而是每个五边形中有一个原子向内凹陷的凹多面体笼形结构，这种内凹畸变是由于每个N原子的三个价轨道形成三个σ键后剩余的孤对电子间的排斥作用引起的。
Hydrogen peroxide/azido-amine combination is hypergolic bipropellant with high density specific impulse.
过氧化氢/叠氮胺类不但密度比冲高，而且可实现自燃；
The optimization design variables were the combustor pressure, mixture ratio, and the outlet pressure of pipe. The optimization objectives were engine specific impulse, payload, engine weight, engine density specific impulse, flight speed at shutting down and engine compositive density.
以燃烧室压强、混合比和喷管出口反压为设计变量，优化目标包括发动机比冲、有效载荷、结构质量、密度比冲、关机时飞行速度、推进剂综合密度。
However, its lower density specific impulse than liquid oxygen/kerosene engine, inferior safety than kerosene and lower performance than liquid oxygen/liquid hydrogen engine, altogether has limited the development and application of liquid oxygen/methane engine.
但由于其密度比冲比液氧/煤油发动机低，使用安全性也不如煤油；性能又比液氧/液氢发动机低，这些都限制了液氧/甲烷发动机的发展和应用。
Gradual engine can meet the needs of specific impulse and density specific impulse of single stage to orbit (SSTO) because the propulsion combination was changed gradually.
通过对推进剂组分进行连续控制，渐变式三组元发动机能够很好地满足单级入轨对比冲和密度比冲的要求。
The results present thrust, specific impulse and thrust efficiency of the thruster under various environmental pressures, as well as impulse density distribution on the exit plane.
计算结果给出了不同环境压强下推力器的推力、比冲、推进效率和出口平面冲量密度分布。
Hydrogen peroxide / azido-amine combination is hypergolic bipropellant with high density specific impulse.
过氧化氢/叠氮胺类不但密度比冲高，而且可实现自燃；
At the atmospheric environment, the coupling coefficient for PVC target containing 20% nano-zinc powder increases first and then decreases with the increase of laser power density, and the specific impulse is not even better than that for PVC targets doped with the higher melting-point metals, such as, Fe and Ni.
在大气环境下，对于掺有20%纳米Zn粉质量分数的PVC靶材，其冲量耦合系数随激光功率密度的提高而先升后降，比冲并不优异于比其熔点更高的Fe粉和Ni粉掺杂。