The impedance spectra of mullite were measured by a frequency response analyzer(FRA) in the frequency range from 10~2 Hz to 1MHz and temperature range of 900~1250 ℃.

Based on a simplified body model,it introduces the basic theory of frequency response,and have a frequency response analysis with MSC/NASTRAN program on the model,two factors which may influence the vibration are discussed simply.

It also analyses in comparative detail the application of correlation function and its spectra to the identification and detection of signal,the estimation for shock response(system function) of unknown system and the identification of unknown system with a frequency response of H(ω).

In each step of the sequential design, an individual controller is designed by the robust frequency response approximation design procedure, the controller order is reduced by a frequency response approximation method.

This paper introduces mapping from prototype lowpass filter, the design of diplex filters used in Bi-directional CATV amplifier, and show a frequency response in PSPICE.

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 impedance spectra of CaS(1%Y2S3) were measured by a frequency response analyzer(FRA) in the frequency range from 10-1 Hz to 1MHz and temperature range of 800-1200℃. The experimental results show that the ionic conductivity range was from 10-4 S·m-1 to 10-6 S·m-1 which increases with increasing experimental temperature.

Single mode 1.3 urn devices of length 250 μm operating at room temperature produced threshold currents of 8 mA, efficiencies of up to 25%, output powers of 18 mW at 80 mA (pulsed), and a frequency response greater than 12GHz.

It is shown that diffusants which take part in surface reactions of finite rate or are subject to reversible trapping within the solid have a frequency response characteristic of the process involved.

A frequency response model in multiquantum well lasers with unequilibrium carrier transport

A frequency sampling filter approximates a desired frequency response by interpolating a frequency response through a set of frequency samples taken from the desired frequency response.

Based on a frequency response approach to the sensitivity analysis of pharmacokinetic models, the concept of structural sensitivity is introduced.

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.

The solution of the equations of higher degree, i. e. the factoring of multinomial, are frequently needed during the analysis and calculation of the amplifier circuits, for example, when concerning the frequency response, stability judgement arid phase compensation, etc. To solve the equation of higher degree is relatively difficult. The conventional way to do it is the graphic method. In this paper, the approximate solution method of the equation of higher dgeree and the estimation of the error are proposed....

The solution of the equations of higher degree, i. e. the factoring of multinomial, are frequently needed during the analysis and calculation of the amplifier circuits, for example, when concerning the frequency response, stability judgement arid phase compensation, etc. To solve the equation of higher degree is relatively difficult. The conventional way to do it is the graphic method. In this paper, the approximate solution method of the equation of higher dgeree and the estimation of the error are proposed. This method can be applied to the solution of the aformeritioned tasks by analytic method. It is simple, easy to use and rather accurate,suitable for use in teaching and ordinary circuit design. As a practical example a frequency response and stability judgement of an amplifier with negative feedback are chosen to show the use of this method.

This paper analyzes the static and dynamic characteristics in Kaplan turbines which involve the following factors: the additional components of the turbine dynamic moment, the water flowing lag effect when the water flows from the guide vane to runner, and the water inertia time constant of water column in the penstock ( Tw1 ) , which should include a correct factor H due to the three dimensional flow in the spiral case. The concept of effective mean instllation head is introduced, considering that the transient...

This paper analyzes the static and dynamic characteristics in Kaplan turbines which involve the following factors: the additional components of the turbine dynamic moment, the water flowing lag effect when the water flows from the guide vane to runner, and the water inertia time constant of water column in the penstock ( Tw1 ) , which should include a correct factor H due to the three dimensional flow in the spiral case. The concept of effective mean instllation head is introduced, considering that the transient pressure distributed along the periphery of the guide vane is nonuniform. In addition, as the hydraulic turbine regulating element is set in the middle position of the water way, the guide vane should act as the interface of the water hammer. By way of a frequency response calculation taking into account the factors mentioned above, a numerical example to check the stability of a hydraulic turbine control system is given. Especially for the system with pure lag, that the system is stable can be insured if the actual lag time τ0 is less than the critical lag time τoc obtained theoretically. The control strategy for the follow-up device of a duplex controller during load variation is further discussed. Finally, some conclusions and suggestions are given.