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target length
相关语句
  目标长度
     Extraction of target length using high resolution range profile
     一种基于高分辨距离像的目标长度特征提取算法
短句来源
     It can be derived into the relatioship between damage length or area and target length,and between relative damage length or area and target length, in the case of the shell damage radius and firing error unchangable.
     推导出在弹丸的毁伤半径和射击误差不变的情况下 ,毁伤长度或面积同目标长度之间的关系 ,以及相对毁伤长度或面积同目标长度之间的关系。
短句来源
     For small target, the limiting condition of stepped-frequency interval by target length is derived.
     对应用于小目标的步进跳频信号 ,导出了跳频间隔受目标长度限制的关系
短句来源
  靶长
     For the total target length of 5.6cm, GL values reached 16 or so, and the divergence angles in the directions of both the target normal and target plane were all 3~4mrad.
     当总靶长为5.6cm时,这两种波长的软X光激光输出的GL值都达到16左右,沿靶法线和靶平面方向的发散角都只有3~4mrad。
短句来源
  “target length”译为未确定词的双语例句
     The rapid increase of the intensities of the two spectral lines with the target length is very apparent. The gain coefficient of 10.57nm (3d-5f)was 1.78cm-1 for the 94.7nm exploding foil targets.
     这两条激光跃迁线,用60nm铝靶时,增益系数分别为3.18和2.26cm~(-1);
短句来源
     By observing the periods of the target length variant,the frequency of nutation is deduced.
     通过观测一维像序列的长度变化周期,提取目标的章动频率;
短句来源
     This algorithm can achieve a very high retrieval speed that has no relationship with target length and the speed can be controlled by the size of retrieval window. Experimental results show that recall rate and accuracy rate are satisfied.
     该算法的速度不随检索目标的长度变化,检索速度可调,且能获得良好的查全率和查准率,适用于从未知音频数据源中检索任意长度的特定音频数据及实时应用场合。
短句来源
     By using multi-beams we can measure the coverage angle for the simulator, and then calculate the simulated target length and the intensity of each 'spot'.
     采用多波束测量模拟目标的覆盖扇面角,通过计算获得目标的模拟尺度和回波亮点强度。
  相似匹配句对
     N TARGET
     命中目标
短句来源
     The level of target gene expression declined with the length of time.
     目标基因表达随时间延长有减弱趋势 .
短句来源
     Target Compounds.
     目标化合物:
短句来源
     length standard;
     长度基准;
短句来源
     Extraction of target length using high resolution range profile
     一种基于高分辨距离像的目标长度特征提取算法
短句来源
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  target length
Importantly, effects of target word properties did not interact with effects of prior target length cuing.
      
At a target length of about 2.5 cm, it was found that, while theG(0-1) andE(0-1) lines have comparable intensities in V, theE(0-1) line dominates spectra from Mn, Cr, Ti and Sc, which have adjacent nuclear charges.
      
Yields are reported as a function of target length over the range of production angles 0o to 15o.
      
The target length should for that reason be much smaller than the decay length of few centimeters.
      
This distance, known as the target length, is one of the parameters that determine the antiproton yield.
      
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Soft x-ray laser gain experiments using Li-like Al XI ions were carried out on the LF -11 (1011 W)laser facility. The single beam of Nd-glass laser was operated at 1.06μm over an energy range of 17-25J for a 200ps pulse. A 100μm- wide and 12mm-long focused line was produced by means of a cylindrical -aspherical lens system. The aluminum targets were slabs and exploding foils (60nm and 94.7nm thick). The extreme ultraviolet spectra (time-integrated) in a region of 2-32nm were recorded on kodak SWR film with a...

Soft x-ray laser gain experiments using Li-like Al XI ions were carried out on the LF -11 (1011 W)laser facility. The single beam of Nd-glass laser was operated at 1.06μm over an energy range of 17-25J for a 200ps pulse. A 100μm- wide and 12mm-long focused line was produced by means of a cylindrical -aspherical lens system. The aluminum targets were slabs and exploding foils (60nm and 94.7nm thick). The extreme ultraviolet spectra (time-integrated) in a region of 2-32nm were recorded on kodak SWR film with a 1 -m grazing -incidence spectrograph. An x -ray pinhole camera photographed the hot plasma in the axial direction. Amplified spontaneous emission was obtained for 10.57nm (3d-5f) and 15.47 nm(3d-4f) transitions of Li -like Al XI ions. The rapid increase of the intensities of the two spectral lines with the target length is very apparent. The gain coefficient of 10.57nm (3d-5f)was 1.78cm-1 for the 94.7nm exploding foil targets. The gain coefficients of 10.57nm (3d-5f)and 15.47nm(3d-4f) were 1.67cm-1 and 0.96cm-1 for 1.2μm targets respectively. Those were 3.18cm-1 and 2.26cm-1 for 60nm exploding foil targets respectively. The result confirms that suitable exploding foil targets can create higher gain coefficient.

在LF-11(10~(11)W)激光装置上,开展了类锂铝(Al~(10+))的X光激光实验研究。实验中,激光器运行在线聚焦工作状态,波长1.06μm,脉冲宽度约为200ps,能量约20J。线聚焦长12mm,宽约100μm。实验中使用了厚铝靶(1.2μm)和薄膜铝靶(60和94.7nm),用时间积分掠入射光栅谱仪测量线状等离子体轴向XUV谱,用针孔照相机监视线聚焦状态。结果表明,Al~(10+)离子的10.57(3d-5f)和15.47(3d-4f)nm线的强度随等离子体的长度呈现明显的非线性增长。这两条激光跃迁线,用60nm铝靶时,增益系数分别为3.18和2.26cm~(-1);用1.2μm铝靶时,增益系数分别为1.67和0.91cm~(-1);用94.7nm铝靶时,波长为10.57nm线的增益系数为1.78cm~(-1)。说明厚度合适的薄膜靶能获得较高的增益。

By use of "series multi -target coupling" , the Ne -like Ge soft x -ray lasers output at wavelengths of 23.2 and 23.6nm were observed on a line -focused two -beam Nd -glass laser at 1.05μm. The pulse width was about 1ns, while the irradiance 0.8 × 1013~1.0× 1013W/cm2 on the target surface. For the total target length of 5.6cm, GL values reached 16 or so, and the divergence angles in the directions of both the target normal and target plane were all 3~4mrad.

采用“多靶串接”设计,利用强度为0.8×10~(13)~1.0×10~(13)W/cm~2,波长为1.05μm,脉宽约1ns的两路钕玻璃激光线聚焦辐照四块串接的平面厚锗靶,观察到波长为23.2和23.6nm的接近饱和的类Ne锗软X光激光输出。当总靶长为5.6cm时,这两种波长的软X光激光输出的GL值都达到16左右,沿靶法线和靶平面方向的发散角都只有3~4mrad。

Abstract We study the gain saturation process for the electron collisional excitation Ne-like GeX-ray laser scheme by coupling the radiation transport equation of X-ray lasers and rateequations, dominating population of levels.We have assumed the gain region, in which X-ray lasers propagate and amplify,is auniform cylindrical plasma, refraction of X-ray radiation is neglected. In the gain region,electron temperature, electron density, ion temperature, fraction of Ne-like ion and F-likeion are given constant....

Abstract We study the gain saturation process for the electron collisional excitation Ne-like GeX-ray laser scheme by coupling the radiation transport equation of X-ray lasers and rateequations, dominating population of levels.We have assumed the gain region, in which X-ray lasers propagate and amplify,is auniform cylindrical plasma, refraction of X-ray radiation is neglected. In the gain region,electron temperature, electron density, ion temperature, fraction of Ne-like ion and F-likeion are given constant. The photons of every lasing line is divided into 201 groups. Thehomogeneously and inhomogeneously broadening of lasing lines were considered. Ne-likeions and F-like ions also are divided into 201 groups according to thermal velocity. Thepopulddtion inversions calculations were based on the steady-state rate equations including37 levels of Ne-like ions and 3 lowest levels of F-like ions.In rate equations, the processof electron collisional excitation and deexcitation, spontaneous emission, dielectronicrecombination from F-like ions to Ne-like ions,stimulated emission, and absorptioncaused by lasing lines, were included. In order to account trapping effect, sevenspontaneous emission coefficients are multiplied by the escape probabilities. The simulated results were compareded with calculation of the usual saturation equation for sin-gle independent laser. In deep saturation stage great differences have been found: the gain of 19.6,23.2, 23.6, 28.6nm lasers drop with increasing target length L more rapidly (see Fig.3). The gainof 19.2, 24.7nm lasers vary from positive to negative with increasing L (see Fig.6). When Lis about 11cm, the integrated intensity of 19.6nm line surpass the 23.6nm line (see Fig.1), thecentral-of-spectrum intensity of 19.6nm line also surpass 23.2, 23.6nm lines (see Fig.8). AfterLgreater than about 7cm, the ratio of intensity of the 23.2nm line and 23.6nm line is about 2 (seeFig.8). These results is similar to results of gain saturation experiment of the Ne-like Se X-raylasers at LLNL ̄[1]. Simulated results also show the“burning hole”in gain s pectral curves (seeFig.5) and decreas ing and increas ing in line width with increas ing target length before saturationand after that

耦合x光激光辐射输运方程与速率方程,编制了研究类氖锗等离子体中多条激光线增益饱和过程的程序。计算结果与普通饱和方程的结果在深度饱和阶段有显著区别。计算结果还显示了增益曲线“烧孔”及线宽在饱和前后由不断变窄到不断加宽的现象。理论结果与“多靶串接”类氖锗X光激光实验数据进行了比较。

 
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