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basic principles
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  基本原则
     A study on the Basic Principles of Science & Technology Progress in Large Enterprises
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     Some Basic Principles of Formulating Electric Welding Machine Standards
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  基本原理
     PALEOMAGNETISM:BASIC PRINCIPLES AND METHODS OF STUDY
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     On the Theoretical Basis of Rheological Mechanics Ⅰ Primitive elements and basic principles
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     BASIC PRINCIPLES OF MECHANICAL THEOREM PROVING IN ELEMENTARY GEOMETRIES
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     Basic Principles of Downhole Drilling Screw Motors
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     BASIC PRINCIPLES AND METHODS TO DETERMINE WOOD DENSITY UNDER X-RAY
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  basic principles
We present here a self-contained derivation, building the decomposition from basic principles such as the Euclidean algorithm, with a focus on applying it to wavelet filtering.
      
Based on the basic principles of the micrometeorology of atmospheric boundary layers and vegetation canopy, a numerical model of the interaction between forest ecosystems and atmospheric boundary layers was developed.
      
The basic principles of the effects of organic and inorganic components of yeast fermentation waste on the properties of the bonding system are analyzed.
      
Basic Principles of Wood Composite Biotechnology(Teoreticheskie osnovy biotekhnologii drevesnykh kompozitov), Bezborodov, A.M.,
      
In the Appendix, basic principles are illustrated with practical examples of analysis of the cell cycle, synchronization, and study of expression of some proteins at various stages of the cell cycle using synchronized XL2 (Xenopus laevis) cells.
      
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With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies...

With the rapid progress of the electronic art, there has been a steadily increasing demand for still wider-bandwidth amplifiers. The recent introduction of distributed amplification concept has provided a new technique and powerful means for designing amplifiers with top cutoff frequencies far in excess of those previously obtainable with,ordinary amplifier circuits. A distributed amplifier of the low-pass type can easily be constructed to have a uniform frequency response from audio frequencies to frequencies as high as several hundred me using conventional vacuum tubes. Unlike conventional circuits, distributed amplifiers have an attainable gain-bandwidth product which is not limited by shunt capacitance associated with the vacuum tubes and circuit wiring; the high-frequency limit being determined entirely by high-frequency effects within the tube proper.The purpose of this paper is to describe the basic principle of distributed amplification and to show how such an amplifier employing various types of transmission lines may be designed. Practical methods hi design and design details are given for a three-stage distributed amplifier, using fourteen 6AK5 pentodes with a frequency response of 0.1 mo to 140 mo and a gain of 33±1 db.Both the negative mutual-inductance m-derived and constant K artificial delay lines hare been used. The former offers the advantage of a more linear phase characteristic and a more uniform response both in amplitude and delay time.The experimental results corroborate the predictions based on the first-order theory described in this paper.

分布式放大是最近宽频带放大的最大成就,过去多年来电子学所应用的各种宽频带放大方法,其高频部分因受电子管电容和线路的分布电容所限制,不能获得理想的结果,而利用分布式放大的理论,所制成的宽频带放大器,远较一般普通的宽频带放大器,有更为宽阔的频带;从它的设计和构造上来看,也较负反馈的宽频带放大器为简单。制造一架自数千周至数百兆周的分布式放大器,在技术上并没有很大困难。本文拟对分布式放大的原理作扼要的分析;并提出了采用各类型仿真线所构成的分布式放大器的设计方法,并利用该设计方法,试作了一只三级十四管的分布式放大器,其增益为33±<1分贝,频宽自100千周至140兆周。由实验结果证明,采用m导出式低通滤波器所构成的仿真线的分布式放大器,实较用常K式者,具有更佳的相移特性和频率特性,这与理论上的分析是一致的。

A series of experiments were carried out to verify the basic principles of "inverse polarography" suggested by Hickling, Maxwell and Shennan. Results lead to conclusions quite different from those of the above workers. In the case of cadmium amalgam electrodes, within the amalgam, the diffusion of electro-active metal from interior to amalgam-solution interface obeys the general equation of linear diffusioni_t=nFACD~(1/2)1/(πt~(1/2)) Anodio half-wave potentials obtained from C-V curves have a definite...

A series of experiments were carried out to verify the basic principles of "inverse polarography" suggested by Hickling, Maxwell and Shennan. Results lead to conclusions quite different from those of the above workers. In the case of cadmium amalgam electrodes, within the amalgam, the diffusion of electro-active metal from interior to amalgam-solution interface obeys the general equation of linear diffusioni_t=nFACD~(1/2)1/(πt~(1/2)) Anodio half-wave potentials obtained from C-V curves have a definite constant value indepedent of amalgam concentration.

1.本文驗証Hickling等的“逆向極譜”基本理論的主要論点,并証明鎘汞齐电極上的扩散屬于线性扩散类型,扩散电流强度与汞齐濃度遵守綫性扩散式, i_t=nFAD~(1/2)C(1/(πt~(1/2)),不同濃度的鎘汞齐所生的陽極波其半波电位为一定数值。 2.把汞齐体积改为4毫升,鎘汞齐濃度在2.37—9.46mM范圍內濃度与扩散电流成直綫关系,可作定量分析的基础。

This paper fully discusses the basic principle and experimental methods of determining aircraft longitudinal dynamic stability derivative during using half-model and various oscillations-free oscillation and fored oscillation. It briefly describes the self-designed and self-menufactured dynamic balance. According to the oomperison of the preliminary experimental results of delta wing model in our 250×200mm2 high speed wind tunnel with FFA62 experimental results, it is proved that this balance is useful....

This paper fully discusses the basic principle and experimental methods of determining aircraft longitudinal dynamic stability derivative during using half-model and various oscillations-free oscillation and fored oscillation. It briefly describes the self-designed and self-menufactured dynamic balance. According to the oomperison of the preliminary experimental results of delta wing model in our 250×200mm2 high speed wind tunnel with FFA62 experimental results, it is proved that this balance is useful. But in the course of our experiments, many problems occurred, hence the last part of this paper offers some suggestions as to the solution of them and states how we should endeavour later on.

本文较全面地讨论了当采用不同的振动法,即自由振动法和强迫振动法时,用半模型测定飞行器纵向动导数的基本原理和实验方法。介绍了自行设计、制造的动天平概况。根据在我院250×200mm~2高速风洞中对三角翼的初步测试结果,与FFA62实验结果相比较表明该动天平是适用的。但在实验中发现不少问题,故在文章最后部分提出了改进的意见和今后努力的方向。

 
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