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 amplitude, the ratio impulse and the energy density of the shock wave as well as the air bubble pressure with structural reflection are analyzed.
在理论上，由于水下爆炸问题涉及到水下冲击波和船体结构的相互耦合作用，数学物理模型的建立尚不完善，且由于较强的非线性因素，数值计算工作量非常巨大。
High Power impulse Unbalanced Magnetron Sputtering has been coupled by a direct current source dc-HPPUMS or dc-HiPUMS. A coaxial coil and a attached hollow cathode was applied to control discharge properties and improve pulsed power density. A large extent breakdown was induced for avalanche discharge mechanism.
采用直流电源形成高功率脉冲非平衡磁控溅射（dc-High Power impulse Unbalanced Magnetron Sputtering，dc-HPPUMS 或dc-HiPiUMS），利用雪崩放电的击穿机制形成深度自触发放电，同轴线圈和空心阴极控制放电特性和提高功率密度。
The result indicate that: the electrodeposition of zinc on nickel and tungsten substrates involves instantaneous three-dimensional nucleation. The coating is the best when the current density is 4mA/cm2 and the temperature is 80 ℃. The coating by the method of the impulse electrodeposition is better than the direct current electrodeposition. Especially when f is 100Hz, ton/toff is 2/8 and J is 8mA/cm2, the coating is clean and uniformity. The crystal size is nearly 0.3μ m.
结果表明：阴极反应为准可逆反应，锌离子在镍电极和钨电极上形核是三维瞬时形核半球形扩散长大过程，直流电流密度为4mA/cm2，温度为80 ℃时，镀层质量最好；脉冲电沉积得到的镀层要优于直流电沉积得到的镀层，尤其在脉冲宽度为2ms，脉冲间隔为8ms，电流密度为8mA/cm2时，得到的镀层光滑而均匀，颗粒大小接近0.3μm。
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。
The power spectral density and performance of multi-pulse impulse radio ultra wideband systems based on S-V channel are analyzed.
针对传统超宽带系统发射单种类型脉冲时多址干扰严重的问题，笔者研究了基于修正S-V标准信道模型的多脉冲超宽带系统的功率谱密度和误码率性能。
Performance parameters such as peak pressure, time constant, impulse, energy flux density and shock wave energy were calculated. These parameters were compared with experimental data.
计算出了冲击波峰值压力、衰减时间常数、冲量、能流密度和冲击波能等参数，并将计算结果与实验数据进行了对比。
For solving the impulse coupling between laser and target, a new method of combining pendulum with light electric tachometer was presented, which was adopted in the experiment to measure the impulse of laser supported detonation wave impacting target at a series of laser power density.
针对激光与靶材相互作用过程中存在的冲量传递问题，提出了悬摆法和光电测速法相结合的测量方法，用于激光支持爆轰波对靶冲量耦合作用的实验测试研究。
An adaptive finite impulse response controller with filtered X algorithm based on Renyis quadratic entropy is proposed to attenuate the noises. Renyis quadratic entropy is defined as the performance index; and the probability density function of the system error is estimated by Parzen windowing estimation method. Renyis quadratic entropy information gradient descent algorithm is applied to the adaptive FIR controller. In addition, the computational complexity and convergence of the proposed algorithm are analyzed.
提出基于2阶Renyi嫡的滤波X自适应有限脉冲响应(finite impulse response，FIR)主动噪声控制算法，定义2阶Renyi嫡作为性能指标，利用Parzen窗方法估计误差的概率密度函数，给出基于2阶Renyi嫡的信息梯度下降算法，实现自适应FIR控制，同时分析了算法的收敛性和计算复杂度。
And when the impulse period is fixed, lower duty ratio and current density are favorable for the filling effect of the plating layer in trench.
在脉冲周期不变的条件下，减小占空比和电流密度，可明显提高凹槽镀层填充效果。
The effects of constant current density value, impulse frequency of power as well as the addition of NaF in electrolytes on growth speed and surface roughness of the films were researched.
分析了恒定电流密度值的大小、电源脉冲频率以及在溶液中添加NaF对膜层生长速率、表面粗糙度的影响。
Aluminum samples are bombarded by an electron beam produced by an 1 MeV pulse electron accelerator and the experimental fit curve between electron beam energy density and the blow-off impulse of aluminum target is obtained.
利用1MeV脉冲电子加速器的电子束对铝合金试件进行轰击，得到了熔化材料的喷射冲量与电子束轰击能量间的拟合曲线。
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；
And the Ni/nano-SiC composite coating was produced by varying the following electroplating parameters: cathode current density, impulse frequency and the rate of vacancy of fast pulse powder and the content of SiC in the electrolyte, and measured the property of the composite coatings.
本文通过改变阴极电流密度，脉冲电源的频率、占空比，镀液中SiC含量等电镀工艺参数获得了镍基纳米SiC复合镀层，并对镀层的性能进行了测试。
By means of residual impulse noise detection, the window size of median filter was chosen adaptively to remove the high density impulse noise while preserving the details of the image.
通过对剩余脉冲的检测，自适应地改变滤波器窗口尺寸，从而有效地滤除密度较大的脉冲干扰，同时较好地保留图像的细节。
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。
The traditional signal detection and processing method are confronted with a significant handle in practice due to several drawbacks of the impulse transmission, such as rapid path fading, density multipath, long delay spread, and multiuser interference.
因为在实际无线环境下脉冲信号传播受到传播路径衰落快、密集多径、延迟扩展相对较长，以及多用户干扰等多方面的影响，传统信号检测和处理方法受到了极大的挑战。
Based on the power spectral density function of impulse wind load, the time history of impulse wind load varying along with the space positions has been concisely simulated.
通过研究随机过程峰值分布的规律，提出了由随机过程的功率谱密度函数来分析随机过程峰值概率密度函数的新方法。
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。