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     XML Security Middleware
     面向XML的安全中间件(数字签名)
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     4D is called as the integrated technology of RS and GIS at 1990s level, it is the basic mode of digltalized product. 4D include DEM (digital elevation model), DOQ (digital orthophotoquad), DRG (digital raster grapher) and DLG/DTI (digital liner grapher), Which provide real time and precise digitalized product for watershed management.
     4D被誉为“90年代水平的遥感与地理信息系统集成的技术”,它是当代遥感与GIS技术结合生成的数字化产品基本模式,包括DEM(数字方程模型)、DOQ(数字正射影像),DRG(数字栅格地图),DLG/DTI(数字专题图)。 4D技术为流域管理提供了高精度、实时性强的数字化产品。
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     In view of the problem that E family SPC can not fulfill the requirement of announcement for customers,J family SPC adds digital integrated announcement module(DIAM).
     针对E系列程控交换机不能满足用户录音通知要求的问题,J系列程控交换机中新增加了DIAM(数字综合录音通知模块)。
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     The developed regeneration method,the choice of control method and the design principle of control system (digital CMOS circuit) were introduced.
     介绍了再生方法、控制方案的选择、控制系统(数字CMOS电路)的设计原理等,并进行了分区、定时自动再生试验。
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     Along with the application of the digital media(include digital image, digital video, digitalaudio and so on) get more abroad, protect copyright become more important.
     随着数字媒体(数字图像、数字视频、数字音频等)的广泛应用,其版权保护成为一个迫切需要解决的问题。
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  (digital
Such systems play an important role in time-frequency analysis and digital signal processing.
      
There are many advantages in the use of Hadamard matrices in digital signal
      
An Inhomogeneous Uncertainty Principle for Digital Low-Pass Filters
      
This article introduces an inhomogeneous uncertainty principle for digital lowpass filters.
      
The measure for uncertainty is a product of two factors evaluating the frequency selectivity in comparison with the ideal filter and the effective length of the filter in the digital domain, respectively.
      
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The problem of large deflection of a clamped circular plate under uniform pressure is studied by the method of successive approximation in terms of the parameter representing the ratio of the center deflection to the thickness. The tedious numerical computations, involved in Way's power series solution are thus avoided. The yielding condition at the edge checks very well with the experimental results given by McPherson, Ramberg and Levy. The method may be easily extended to any other boundary conditions and...

The problem of large deflection of a clamped circular plate under uniform pressure is studied by the method of successive approximation in terms of the parameter representing the ratio of the center deflection to the thickness. The tedious numerical computations, involved in Way's power series solution are thus avoided. The yielding condition at the edge checks very well with the experimental results given by McPherson, Ramberg and Levy. The method may be easily extended to any other boundary conditions and loading details.

本文所研究者,为一周缘夹紧之圆板,在匀布之侧向重压下所生之巨大挠曲。本文用圆板中点之挠曲距离与板厚之比率为参数,逐步求得本题之近似解答,藉此避免前人Way氏之幂级数法中繁重之数字计算。圆板周缘呈现委屈现象之条件,亦可求得,其结果与McPherson,Ramberg及Levy诸氏之实验,完全吻合。本法亦可适用于一圆板在其它周缘条件及其它荷重情况下之诸问题。

The principal object of this paper is to present a direct method of finding the elevation of the exposuae station and conseqently the tilt and the swing, if desired, of an aerial photograph. Since the elevation of the exposure station is found, the plumb-line coordinate system can, in the sense of numerical calculation, be established however. The determination of the plumb-line coordinate system, relating to three ground control points and their cooresponding images on the photograph, means a determination...

The principal object of this paper is to present a direct method of finding the elevation of the exposuae station and conseqently the tilt and the swing, if desired, of an aerial photograph. Since the elevation of the exposure station is found, the plumb-line coordinate system can, in the sense of numerical calculation, be established however. The determination of the plumb-line coordinate system, relating to three ground control points and their cooresponding images on the photograph, means a determination of the position of the photograph in space. As can be seen the plumb-line coordinate system is definitely independent of the swing of an aerial photograph, the swing is not necessary in solving the space resection problem as the classical procedure done.The treetment in this problem involves only simple computations and produces exceptionally accurate results, as indecated in a numerical calculation during the preparation of this paper. Owing to the impossibility of publishing the numerical example in whole length, only the final results are referred here for comparing:

本文的目的,在於推導出一直接的算學方法,以求空中攝影的高度,進而求出其像片的倾角;如有必須時也求出像片的旋角來,但在本文的理論推導過程中,過去一般認為要先解决旋角的問題,而後才能解決空間定位問题的歷史看法,已經完全修正;旋角並不是解决空間定位問題所必須的。因為攝影高度既經决定,我們可以建立一垂綫坐標系,與像片在空間的轉動無關。每一像點在此垂綫坐標系上的關係完全可以藉攝影高度的得知而決定;此種關係的決定即相當於像片在攝影瞬間的空間位置的决定。這對於無論是像片的糾正、製圖、交會定點都是非常有幫助的。本文所論的方法,經數字計算的結果,表明精度是很高的,而計算手續也是簡便的。由於避免篇幅過長故未將全部計算例引出,只在此地列出一結果以相比較:

The object of the present work is to investigate the characteristics of piezo-electric resonantors which are cut from the natural coloured quartz, and compare the results with those obtained from those plates cut from the ordinary clear quartz in order to see if coloured quartz might be used as piezo-electric material in practice. In this work four points were stressed, they are: (1) the frequency constants of piezo-electric oscillation, (2) its stability, (3) its selectivity and activity and (4) its frequency-temperature...

The object of the present work is to investigate the characteristics of piezo-electric resonantors which are cut from the natural coloured quartz, and compare the results with those obtained from those plates cut from the ordinary clear quartz in order to see if coloured quartz might be used as piezo-electric material in practice. In this work four points were stressed, they are: (1) the frequency constants of piezo-electric oscillation, (2) its stability, (3) its selectivity and activity and (4) its frequency-temperature coefficient curves. Further more a comparison of the characteristics of oscillations before and after the heat-treatment of the material was made. By the results of these experiments it concludes that the natural coloured quartz plates can be excited into piezo-electric oscillation and serve as piezo-electric resonantors. The frequency constant of a Y-cut plate from coloured quartz is about 2% lower than that of same type cut plate from clear quartz, while the frequency constants of the X-cut plate and the AT-cut plate from the coloured and clear quartz are practically the same. The heat-treatment to the three types cut plates of both kinds of quartz has a definite influence on their frequency. This effect is more pronounced to the coloured quartz plates. Likewise, heat-treatment improves, from the point-view of statistics, the selectivity and activity of oscillation of both kinds of quartz. Finally, the values of some coefficients of stiffness of the coloured and clear quartz were discussed.

本文的目的在于研究天然有色水晶在当作压电共振器用时它的压电振荡性能,并与无色水晶在这方面的性能上作一比较,以推断有色水晶是否可以应用到实际的控制电路振荡的工作中去。我们的工作分四方面进行:(一)有色水晶压电振荡的频率常数,(二)有色水晶压电振荡的稳定性,(三)有色水晶压电振荡的选择性及活动性,(四)有色水晶压电振荡的频率——温度系数。并且把有色水晶在用热处理方法去色后的这四方面实验结果与去色前的作一比较。实验的结果证明有色水晶是可以被激发压电振荡的,和无色水晶一样可以作控制电路振荡之用。有色水晶的Y-截法的频率常数比无色水晶的约低2%。至于两种水晶的其余两种X-截法及AT-截法的频率常数基本上无差别。热处理能使两种水晶的三种截法的压电振荡频率有增高的倾向,这效应在有色水晶中更为显著。同样,热处理对于两种水晶三种截法的压电振荡的选择性及活动性,在统计数字上看来是有益处的。最后,就以上测量的结果,推算了并讨论了有色水晶和无色水晶的若干劲度系数异同之点。

 
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