For adds and subtracts , the average number of cycles required is two , versus about 12 to 15 for the previous type . this is almost a 75 % reduction in execution time : 120 ns versus 400 ns 对于加减法运算所需循环的平均数是2 ，而旧型号机却需12 ? 15 。在执行时间上减少约75 % ，即现在用130纳秒，从前用400纳秒。
Pulses in the nanosecond and subnanosecond regimes with high power and high repetition rate have wide applications in lidar , ranging , remote sensing , microsurgery , micromachining , and so on 高峰值功率、高重复频率的纳秒至几百纳秒的脉冲激光，广泛地应用于激光雷达、激光测距、遥感遥控、微型手术和微型机械方面。
The nlo properties of the tmaf / pss , ttaf / pss and thaf / pss films under the nanosecond laser pulse are compared . the results show that the optical nonlinearities are weakened with the increasing of the 将tmaf / pss 、 ttaf / pss和thaf / pss薄膜的纳秒非线性结果进行比较,发现随着c60中碳笼上取代基个数的增加,光学非线性减弱。
Employing the self - consistent nonlinear theory , the wave beam interaction and the wave developing with time in the subnanosecond millimeter relativistic backward wave oscillator were theoretically analysised 本论文采用自洽非线性理论，理论分析了相对论返波振荡器中注波互作用及亚纳秒电子束与波在微波器件中随时间的演变过程。
He or she can spend four hours lecturing about the history of an obscure programming language or providing a proof of how the code you wrote is less than perfectly optimal and may take an extra three nanoseconds to run 他或者是她可以花4个小时去探讨一个很冷僻的语言，或者去证明你写的代码是如何的不完美并且有可能会在运行的时候多花3纳秒。
Subnanosecond millimeter relativistic backward wave oscillator , based on superradiance mechanism , was a novelty microwave device developed in last few years . the dependence of peak power on the square of the density of electron beam is almost linear 基于超辐射机理的亚纳秒毫米波微波器件是近几年发展起来的一种新型微波器件，其辐射功率与参与束波互作用的电子束密度的平方成正比关系。
The nlo properties of the essa films were measured with the ns / ps laser by using the z - scan technique . the materials c60 derivatives ( mono - adduct tmaf , tri - adduct ttaf and hexa - adduct thaf ) and pss act as the positive charged electrolytes and opposite electrolyte , respectively 利用纳秒和皮秒激光脉冲作为光源,采用z - scan技术测量了以c60衍生物(单加成tmaf 、三加成ttaf和六加成thaf )为正电荷电解质, pss为负电荷电解质的静电自组装薄膜的光学非线性。
The use of the state - of - the - art laser facility makes it possible to create conditions of the same or similar to those in the astrophysical processes . the introduction of the astrophysics - relevant ideas in laser - plasma experiments is propitio us to the understanding of the astrophysical phenomena . however , the great difference between the laser - produced plasmas and the astrophysical processes makes it awkward to model the latter by laser - plasma experiments . this paper addresses the physical backgrounds for modeling the astrophysical plasmas by laser plasmas , connecting these two kinds of plasmas by scaling laws . thus , allowing the creation of experimental test beds where observations and models can be quantitatively compared with laser - plasma data . special attentions are paid on the possibilities of using home - made laser facilities to model astrophysical phenomena 采用当前最先进的激光装置与物质相互作用，可以获得与天体物理过程中相同或相似的条件，并进而开展利用激光等离子体模拟天体物理现象的实验.然而，激光等离子体为微米空间尺度、纳秒存活时间，而天体物理对象则为宇宙学的极大的时间与空间尺度，对在物理上和实际操作上将这两种表面上存在巨大差异的物理过程对应起来从而利用激光等离子体研究天体物理过程的可能性进行了讨论，特别是对利用国内的激光装置开展模拟实验的可行性进行了讨论
Extremely short period pulses have been employed in this technology ( usually as short as several nanoseconds or even several picoseconds ) , which results in the transmission capability of up to gigabits per second [ 1 - 4 ] . because of the high transmission rate , uwb communications are best suited for wireless personal area networks ( wpan ) Uwb技术采用超短脉冲发射技术(纳秒乃至皮秒量级) ,占用的频谱可达几个ghz ,这使得其在短距离内可达到几百兆比特的传输速率[ 1 - 4 ] ,该技术因此而非常适于近距离高速无线个人域网[ 2 ] ( wpan ) 。
The simulation results show the existence of both limits and optima for the studied parameters , related to the stable operation and the maximum efficiency , respectively . underlying the conditions that the longitudinal guiding magnetic field is 1 . 8t , diode voltage is 250 kv , the impedance is 150 , we got a peak power as high as 100 mw for the tm01 mode at 38ghz 经优化设计，本文给出了一个相对论亚纳秒毫米波返波振荡器的物理模型，在引导磁场为1 . 8t 、二极管电压为250kv 、阻抗为150的情况下得到了超辐射状态下输出微波峰值功率为100mw 、中心频率为38ghz 、模式为tm _ ( 01 )模的微波辐射。
