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sight line
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  视线
     The Survey method by Electronic Total Station in Sight Line Blocking
     全站仪视线受阻时的测量方法
短句来源
     A Study on the Method for the Control of Height of Sight Line and the Surrounding Environment of the Stadium——With Chongqing Yuanjiagang Stadium as an Example
     体育场周边景观与视线高度控制方法研究──以重庆市袁家岗体育场为例
短句来源
     Technique realization for trailing sight line in simulated vehicle driving
     车辆模拟行驶中视线跟踪技术的实现
短句来源
     The geometrical model of the position of driver's eyes in simulated driving was built based on geometrical characteristics of roads,and the concept for trailing sight line was introduced.
     根据道路的几何构造特点 ,建立了车辆模拟行驶中驾驶员视点位置的几何模型 ,介绍了视线跟踪的概念。
短句来源
     The height of sight line and the surround-ing landscapes around Chongqing Yuanjiagang Sta-dium is controlled by following the principle of"controlby region","control by stage"and"most unfavorablecontrol",applying the method of control by region inplane sector and section plane analysis and coor-dinating various contradictions by application of thestrategy of"gross balance".
     重庆市袁家岗体育场周边景观与视线高度控制规划,以“分区控制”“分级控制”“最不利控制”为规划原则,采取平面扇形分区控制和视线剖面分析的规划方法,运用“总量平衡”等策略协调各方矛盾,对体育场周边景观与视线高度进行控制。
短句来源
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  瞄准线
     Sight line stabilizing and auto tracking control system with C196MCU
     具有 C196 微控制器的瞄准线稳定与自动跟踪系统
短句来源
     The defect diagnosing equtions of sight line offset are given and optimized in this paper by using the vector analysis.
     本文利用矢量分析法,分析了瞄准线偏移与各故障因素的关系,导出了瞄准线偏移故障诊断方程并对其进行了优化。
短句来源
     DIAGNOSIS EQUTIONS OF THE SIGHT LINE OFFSET AND ITS OPTIMIZATION
     瞄准线偏移故障诊断方程及其优化
短句来源
     Building of Mathematical Model of Sight Line for Laser Helmet Mounted Display and Sight System
     激光式头盔瞄准具瞄准线数学模型的建立
短句来源
     It is necessary to design a two axis gyro stabilized control platform to ensure the space stability and the automatical target tracking capability of the sight line despite of its carriage movement.
     为保证载体运动时瞄准线的空间稳定性和自动跟踪目标,必须设计双轴陀螺稳定平台。
短句来源
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  “sight line”译为未确定词的双语例句
     The whole system, including the HII region and the gas-dust ring, moves at a sight line velocity of -61.0 km/s in a large cloud that has a sight line velocity of - 57 km/s.
     包括环和HⅡ区在内的整个系统视向速度为-61km/s,该系统居于视向速度为-57km/s的更大分子云中。
短句来源
     A Compensating System of Sight Line Error for Missile Radome
     基于DSP处理器的导弹天线罩误差补偿系统
短句来源
     Using the Unno-Beekers equation and the Eunge-Kutta method with changed step long, FeI λ5324. 19 A line forming in magnetic fields of the solar photosphere, peumbra and umbra has been computed. When using the special birefringence filter with half width 0.15 A which is the monochromator of the Solar Magnetic Field Telescope, the coefficients of the theoretical calibration for the salar magnetic field and Solar sight line velocity field have been computed also.
     本文用Unno-Beckers方程和变步长Runge-Kutta法,计算了太阳光球、黑子半影和本影中FeI λ5324,19谱线在磁场中的形成,并结合半宽0.15专用双折射滤光器,计算了磁场及视向速度场的各种理论定标参数。
短句来源
     The correcting plane π_k, correcting sight line and the formula of the error have been built. If these formulas can be applied to the calculation of meeting parameters, the new calculating results will be more correct.
     本文建立了修正平面π_k、修正光轴和这种误差的修正公式,如果将这些公式应用到相遇参数的计算中去,那么新的计算结果就将更符合实际情况。
短句来源
     Taking the Shenwo project as an example, this paper introduces the automatic monitoring system of transducers and its performanee, and, through the comparison with the sight line measurement, demonstrates the advantages and necessity of using the transducer for concrete dam observation.
     并以参窝工程为例,介绍了引张线自动化监测系统及其运用情况,通过与视准线测量相比较,说明了混凝土坝引张线观测的先进性和必要性。
短句来源
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  sight line
Where the ground plane abuts a distant object, there is a vertical red line indicating a sight line.
      
We shoot each sight-line from one voxel in one door to the other voxel on the corresponding door.
      
Weighted average of azimuths from station to points along bore-sight line; in degrees clockwise from true north.
      
The systems produce sight-line Doppler, and incidentally backscatter strength, with a range resolution determined by the laser pulse-length.
      
The computer was installed left up a metre above the eye-sight line of the driver.
      
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It is discussed that a measurement method of both solar magnetic field and solar sight line velocity. The method is used in the Solar Magnetic Field Telescope (Similar video magnetograph) which is being produced. A narrow band birefringent filter is used as a monochromater which has two wave bands, one is FeI λ 5324 A with half width 0.15 A, the another is Hβ λ 4861 A with half width 0.12 A.A television-computer, a photomultiplier and two photograph are used as receivers. KD* P crystals are used as electro-optic...

It is discussed that a measurement method of both solar magnetic field and solar sight line velocity. The method is used in the Solar Magnetic Field Telescope (Similar video magnetograph) which is being produced. A narrow band birefringent filter is used as a monochromater which has two wave bands, one is FeI λ 5324 A with half width 0.15 A, the another is Hβ λ 4861 A with half width 0.12 A.A television-computer, a photomultiplier and two photograph are used as receivers. KD* P crystals are used as electro-optic light modulators. The broad sight field KD* P modulator has been researched and produced. It consist of two KD* P crystals and a wave plate with effect of 90° rotation. In 36' half sight field, the biggest error of λ/4 wave retardation is only + λ/300 instead of A/25 which exists in narrow sight field design. To observe the solar magnetic field and the solar sight line velocity, three groups of the KD* P modulators are used. High voltage power supplies of square wave with 135 e/s and sawtooth wave with 270 c/s are operated on the KD* P. The influnece of wave forms errors of the high voltage power supplies has been calculated and discussed. Eaising time and returning time are promised up T/30, T is period. But returning time of the sawtooth wave should be smaller than T/100. Voltages of half wave of above wave forms have been measured. Combination experiment of the KD* P modulator and high voltage power supply has shown that their behaviours are well.

本文讨论了正在研制的太阳磁场望远镜中由窄带双折射滤光器作单色器,分别用电视-计算机和光电倍增管作接收器时,运用KD~*P电光调制器及相应的锯齿波和矩形波高压电源,测量矢量磁场及视线速度场的原理和方法。研制了宽视场KD~*P调制器,并讨论了高压电源波形误差的影响。KD~*P调制器与高压电源联试表明,调制器及电源的有关性能良好。

The problem of optimal intercept guidance laws for missiles have been studied by a lot of authors at home and abroad. But the mathematical models for missiles were assumed too simple, i. e. either as an ideal particle or as a first order delay link.As a primary contribution this paper has made researches on the optimal intercept guidance laws based on a mathematical model with second order charac- teristics. By taking minimum control energy consumption as the performance index, the optimal intercept guidance...

The problem of optimal intercept guidance laws for missiles have been studied by a lot of authors at home and abroad. But the mathematical models for missiles were assumed too simple, i. e. either as an ideal particle or as a first order delay link.As a primary contribution this paper has made researches on the optimal intercept guidance laws based on a mathematical model with second order charac- teristics. By taking minimum control energy consumption as the performance index, the optimal intercept guidance laws have been derived from the minimum principle in the following two cases of terminal state:1. The terminal miss-distance is zero;2. The intercepting curved surface of out-of-control.The conjugate state equations and the state equations have been solved by use of Laplace Transformation. Through considerably complex computation, the optimal intercept guidance laws have been deduced in the following analytical formsThrough appropriate selection of the terminal time lf or the time of lead T, the results obtained above may be transformed into the optimal guidance laws which are composed of the proportional navigation with varied coefficients and the correctional terms associated with acceleration and angular acceleration of sight-line rotation. These results are similar to those of missiles with first order delay link in form and have no need of any additional parameter. However, the computation is more complex and the results are more accurate.Finally, the optimal intercept guidance laws are studied in the case of the proper frequency of a missile ω approaching to infinity, i. e. in the case of an ideal particle. The results are the same as those obtained by the other authors.

本文研究了具有二阶环节的导弹其对目标的最优导引律。利用极小值原理分别研究了1)脱靶量为零、最小控制能量指标的最优导引律;2)终态为零控拦截曲面、最小能量指标的最优导引律。最后得出了与具有一阶延迟环导弹所得结果类似,但计算工作量更大,结果应更准确。

Spectrum of peak flux of solar type IVdm radio burst is generally characteristic of large spectral index, narrow-band, high flux. In addition decirnetric solar radio burst observed in single frequency records swings with time, period of swings is order of seconds [1, 5].According to [6], it had excluded the possibility that the narrow-band type IVdmsolar radio burst is explained by gyrosynchrotron process. It seems that only plasma emissions would be chosen.We have shown in [7] that spectral character of solar...

Spectrum of peak flux of solar type IVdm radio burst is generally characteristic of large spectral index, narrow-band, high flux. In addition decirnetric solar radio burst observed in single frequency records swings with time, period of swings is order of seconds [1, 5].According to [6], it had excluded the possibility that the narrow-band type IVdmsolar radio burst is explained by gyrosynchrotron process. It seems that only plasma emissions would be chosen.We have shown in [7] that spectral character of solar type IVdm radio burst is explained by mechanism of Langmuir's nonlinear scattering by thermal ion. In this paper, we try to explain character by wave-wave interacting nonlinear process. Our ideas are as follows. The nonthermal electrons accelerated in explosive phase are trapped in coronal mirror, it forms the source of type IVdm radio burst. These nonthermal electrons excite simultaneously low-frequency Whistler wave and high-frequency Lang-muir wave. These two waves' nonlinear coalesce process leads to produce transverse-wave of type IVdm solar radio burst. Available data are taken from [8-10].In this paper, we adopt anisotropic loss-cone gap distribution as distribution function of electrons [11-14]. Energetic part of gap distribution is taken as Gauss's wave packet with central energy of wave packet E=100keV. By means of this, we obtain emissity propagating parallel to magnetic direction and linear growth rate of Whistler indicated in (1) and (2), and that of Langmuir wave in (5)- (6). With these quantity, we may calculate wave number spectral density Wlkl (or Wkww) from solution (9) of wave's radiation transfer equation with t= Ll/vgl (orLw/vgw. The thickness of Langmuir's plasma level Ll is supposed to be Ll-Lw=500km, for example, Pig. 1 describes Wkww diagram of Wpe=2n×500 MHz plasma level. Fig. 2 indicates the diagram of Langmuir's growth rate n at plasma frequency of 2n×200MHz.Coalesce process of Langmuir wave and Whistler wave must satisfy resonance condition Eq. (10). According to [4], under coronal condition, it is not satisfied until that the angle between Langmuir wave Kl and Whistler wave Kw is less than10. Thus. we assume that Kl and KW are parallel to magnetic direction to compute Kw, Kl , Kr by means of linear dispersion relation. Such calculated Langmuir's phase velocity is larger than light velocity. But the phase velocity of Langmuir wave excited by fast electrons is less than light velocity. So Langmuir wave which, is calculated from (5) and (6) can not interact with Whistler wave. However Langmuir wave converts easily into new Langmuir wave due to nonlinear scattering by ion. In this process energy almost conserves, wave number decreases, phase velocity increases. New formed Langmuir wave may interact with Whistler wave. Besides, in scattering process Langmuir wave vector turns toward magnetic field [15]. Hence we can calculate wave number moreover still calculate Langmuir's Wkll by (5) and (6) to replace approximately new Langmuir wave after scattering.Coupling equation of l+ w - t process is Eq. (11). Angular radius of the souree takes 2'.In the corona, because of Qe<sight line direction of source is 3×109 cm, electron density with radial direction is taken approximately 6×Newkirk's value [17]. For convenience, we take the source as a column perpendicular to Photosphere surface.According to former formula, we have calculated spectrum of type IVdm radio burst on Aug. 2, 0330, 1972 (Fig. 3). It is seen from Fig. 3 that spectrum of numerical calculation coincides roughly with that of observation. By comparision with each other, we obtain a nont

本文提议了太阳IV_(dm)型爆发的波-波非线性相互作用机制及其频谱的数值计算方法.假设Iv_(dm)型爆发源位在太阳日冕0.6 R_⊙地方,磁场强度为4G—23G的一个磁瓶.它捕获在爆炸相期间受到加速的非热电子(E_0=100keV).这些各向异性的非热电子同时激发朗谬尔波和哨声波.这两种波的非线性结合过程产生了lV_(dm)型爆发的横波.数值计算1972,8,2,0330的频谱与观测符合较好.两者比较得到非热电子数密度随频率(高度)的分布,还得到IV_(dm)型爆发源中的平均电子数密度为372/cm~3,源中的总的非热电子数为10~(32).这比迥旋-同步加速机制所需的非热电子数少1—2量级.文中还谈到了哨声波调制朗谬尔波导致分米波爆随时间振荡的可能性.

 
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