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and theory
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     Researching systematically to what the network security is, the importance of it, the correlations of it and the national security, what problems it contains, and discussing how to cope with these problems, analysing and summarising related countermeasure and strategic action are significant theoretically and practically for our national security and theory research.
     对什么是网络安全、网络安全有何重要性、与国家安全的关系如何、网络安全包含哪些问题进行系统的研究,探讨如何应对这些问题,分析总结我国在该领域的相关对策与战略措施,对于我国国家安全及其理论研究都有着重要的理论意义和现实意义。
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     EXPERIMENT AND THEORY OF POLYCHROMATIC LASER BEAM SELF PUMPED PHASE CONJUGATION QUENCHING IN Cu DOPED KNSBN CRYSTALS
     Cu:KNSBN晶体中复色光自泵浦相位共轭猝灭实验及其理论解释
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     The Flow Inversion Test and Theory Analysis for HFETR
     高通量工程试验反应堆流量反转试验及其理论分析
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     QUALITY ASSURANCE SYSTEM AND THEORY FOUNDATION FOR WELDING OF WESTERN GAS PIPELINE PROJECT OF LIBYA
     利比亚西部管道工程焊接质量保证体系及其理论依据
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     This paper divides Neural Network Models and Theory into four parts: ① Neuron model and its theory;
     本文把神经网络模型理论分为四个部分:①神经元模型及其理论;
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     Application and Theory Study of Turning Chatter Suppression Based on ERF
     电流变材料在车削颤振抑制中的应用及理论研究
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     A Research of Demonstration and Theory on the Influence of Sport Information on Mass Communication to the Sport Life of Collegians
     大众传媒体育信息影响我国大学生体育生活的实证与理论研究
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     Experimental Research and Theory of Leachate Biological Treatment Technology
     垃圾渗滤液生物处理实验研究及理论
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     Thermal Stress of Slag on Walltube Created by Boiler Load Shift and Theory Reasearch on Fuzzy Online Optimization of Boiler Sootblow
     电站锅炉变负荷引起的水冷壁渣层热应力和吹灰在线模糊优化运行的基础理论研究
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     Vacuum Preloading: Experiment and Theory
     真空预压加固地基的试验及理论研究
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     这些概念和理论为不确定性信息理论奠定了基础.
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     The theory and the (?)
     这个理论本身和社会实践均有一个不断发展的过程。
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     theory.
     理论计算得理论图。
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     ITS and Selforganization Theory
     ITS 与自组织理论
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  and theory
Reversibly switchable DNA nanocompartment on surfaces: experiments, applications, and theory
      
The Role of Potassium, Potassium Channels, and Symporters in the Apoptotic Cell Volume Decrease: Experiment and Theory
      
Structure of 2-Methyl-1-Nitroisothiourea: Experiment and Theory
      
Comparison of the experiment and theory demonstrated the admissibility of using the quasione-dimensional approximation and the model chosen to describe the cleaving of the water.
      
Two-Phase Filtration in a Transversally Isotropic Porous Medium: Experiment and Theory
      
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This paper reviews the observational facts and theories on the airflow over small mountains. Special emphasis is laid to point out and discuss the controversies in the theory of lee waves among different writers. According to present author controversiesare due to (1) the difference in scale of the mountain and (2) the choice of the upper boundary condition. When l is comparable to the critical value , where l is the half-width of the mountain, lee waves occur. When there is an upper solid lid or...

This paper reviews the observational facts and theories on the airflow over small mountains. Special emphasis is laid to point out and discuss the controversies in the theory of lee waves among different writers. According to present author controversiesare due to (1) the difference in scale of the mountain and (2) the choice of the upper boundary condition. When l is comparable to the critical value , where l is the half-width of the mountain, lee waves occur. When there is an upper solid lid or a discontinuity in the atmosphere lee waves occur.In the first case the forced vibration is in resonance with natural vibration. In the second case there can exist only vibrations of certain wave lengths, which appears as those of the lee wave. The physics of lee waves is thus clear.

本文总结了小地形对于气流的影响。文中着重地指出和讨论了过去背风波理论中的矛盾。作者认为这些矛盾是由于山的大小选择和上界边界条件的选择而引起的。当山的宽度的一半l≈(L_S/2π)时(L_S=u/(g/θ αθ/αz)(1/2)),和当大气中有一个固定的盖或不连续面存在时,背风波出现。 在第一种情况下,山的强迫振动与大气中的自由振动共鸣;在第二种情况下,只具有某些滤长的振动可以存在,这波长就是背风波的波长。这样的讨论背风波的物理意义就清楚了。

Many novel nanosecond pulse circuits with nanosecond rise time and high-repetition rate using step recovery diodes are discussed and recommended in this paper. The physical mechanisms of these circuits are described qualitatively by using the charge storage concepts and theory.The circuits discussed in this paper are divided into three groups: the pulse forming circuits which transform high frequency sinusoidal waves into nanosecond pulses; the pulse shaping circuits which transform pulses with slower...

Many novel nanosecond pulse circuits with nanosecond rise time and high-repetition rate using step recovery diodes are discussed and recommended in this paper. The physical mechanisms of these circuits are described qualitatively by using the charge storage concepts and theory.The circuits discussed in this paper are divided into three groups: the pulse forming circuits which transform high frequency sinusoidal waves into nanosecond pulses; the pulse shaping circuits which transform pulses with slower transient response into pulses with faster transient response, and the pulse generator circuits which make use of the step recovery diodes combined with other high-speed semiconductor devices.The inherent capability and importance of the step recovery diodes in the nanosecond pulse circuits are well illustrated by the discussion of various circuits developed in this paper. Other types of new pulse circuits using step recovery diodes with more detailed analysis and practical circuits will be reported in the near future.

本文討論了利用二极管由正向至反向恢复的阶跃特性所构成的多种新穎毫微秒脉冲电路;指出了阶跃恢复二极管在高重复頻率毫微秒脉冲电路中应用的多种可能性;并根据电荷存儲概念对各电路的物理机构提出了定性描述。 本文所研究的电路分成三类:将高重复頻率正弦波变換成毫微秒脉冲的形成电路;将响应慢的脉冲变換成响应快的脉冲的整形电路;与晶体管配合的毫微秒脉冲发生器电路。 通过这些电路的討論,提出阶跃恢复二极管在脉冲电路中应用的重要性及潛在能力。在以后的論文中将探討其它新型电路,并对某些电路作較詳尽的分析,提供实际应用举例。

Modulation of air stream is an efficient method of sound production. Man's speech organs, sirens, electro-pneumatic loudspeakers as well as common whistles are all based on this principle. The features of air stream sound sources are their high efficiency and possibility of high power outputs, which afford them practical value. The sound production by modulating air streams were discussed by previous authors and theories-given, but some were oversimplified and others too involved to allow practical computations....

Modulation of air stream is an efficient method of sound production. Man's speech organs, sirens, electro-pneumatic loudspeakers as well as common whistles are all based on this principle. The features of air stream sound sources are their high efficiency and possibility of high power outputs, which afford them practical value. The sound production by modulating air streams were discussed by previous authors and theories-given, but some were oversimplified and others too involved to allow practical computations. In this paper, air flow vs pressure characteristics of air stream sources are derived from the basic theory of gasdynamics and graphical method is presented for the estimation of sound radiation under given conditions of plenum pressure and nozzle-to-horn throat area ratio. It is established that although the air flow characteristics as well as the radiation relations are nonlinear, the radiated sound power is determined mainly by the radiation of the fundamental, and approximations give rise to simple expressions for the radiated sound power, the air stream yield and efficiency, with an error less than 1 dB from exact results. Charts are given to facilitate design and question of optimum condition is discussed.

利用气流调制以产生声音是一个比较有效的方法。人的发声器官、旋笛、电动气流扬声器以及一般哨子等都是根据这个原理。气流声源的特点是效率高,功率可以很大,有实用价值。关于气流声源的发声原理,过去已有一些讨论,但有的是过分简化,有的比较细致,但又过于繁复,不便计算。本文从气体动力学的基本原理出发,求得气流声源的气流-压力特性,并用图解法求得在给定气室压力和气流喷口面积比的条件下声辐射特性的方法,考虑到气流声源的气流特性和辐射关系都是非线性的,但是辐射声功率主要由基频决定,从而用近似理论求得了声功率、气流产额和气流效率的简单表达式,和严格理论的结果相比,误差不到1分贝。文中把结果画成图表以便计算,并讨论了最佳设计的问题。

 
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