It is a problem which database deviser and developers concerning very much that how to regard a DBMS application system as a whole availably and to improve its running efficiency. It affects directly the degree of the customer accepts with whole system. It is also a pivotal factor to apply the system successfully.

Treating computer information system as a whole, software, hardware and information as component parts of computer information system may become the target of the crime, but the employees of computer information system and the applied environment can not become the target of the crime in whatever condition.

Based on the experimental phenomena of lasing in ZnO powder, the system of interaction of ZnO powder media with matching pump light was treated as a whole, and a corresponding physical model was found.

According to the half-wavelength-vibration theory, the size of the system's each part must have the same resonance frequency to guarantee the system work as a whole.

Considering both integrated into a single system, and adopting the loop-shaped H_∞ control method, a multivariable robust coordinated controller for the superheated and the reheated steam temperature is being designed.

To study the performance of high and low stage compressors and that of the system as a whole, a two-stage turbocharging system was matched, and a special two-stage turbocharging system test bench was built.

Calculation results show that the variation of the rotational inertia or stiffness either of the rotor system as a whole (namely shafting) or only locally may both remarkably influence the TV characteristics of the rotor.

After acceleration the rotation rate is determined from the ordinary differential equation describing the process of deceleration of the system as a whole.

The case of two minima is characterized by the condition of loss of stability of the fluid in the system as a whole and in the thinner stratum with greater permeability.

As a result, the performance and flexibility of the data acquisition system as a whole increase, allowing one to conduct investigations at a higher methodological level.

So far in studying harmonic problems caused by HVDO transmission, the AC and DC systems should be treated as a whole to obtain accurate results. In order to establish the system mathematic model, a set of equations in general form of bipolar HVDC transmission line is proposed in the paper. The equations directly describe currents and voltages relation between sending and receiving end of the DC transmission line. These equations are then expressed in node admittance matrix form which can be conveniently applied...

So far in studying harmonic problems caused by HVDO transmission, the AC and DC systems should be treated as a whole to obtain accurate results. In order to establish the system mathematic model, a set of equations in general form of bipolar HVDC transmission line is proposed in the paper. The equations directly describe currents and voltages relation between sending and receiving end of the DC transmission line. These equations are then expressed in node admittance matrix form which can be conveniently applied to the analysis and calculation of all steady state operating conditions in AC/DC power systems. In addition, the equations used to determine voltage and current propagation along the DC line are also given in the paper.

With the substitution of a system approach for the traditional mode based on isolated analysis, this paper focuses on the search of an overall electric traction system which includes a power supply system and electric Iocomotives, and presents an original model described by four sets of state equations and a reduced model meeting the accuracy requirements, of engineering computations. The model has been verified by comparing the resuits of a simulation test with those from field test.

: The prediction method of maximum fluid-withdrawal rate of oilfields introduced in this paper is to consider the cfevelopment system of an oilfield as a whole. Using the principle of material balance, a prediction method with a rather systematical development index is established. Using a certain pressure cut off, the maximum fluid-withdrawal rate of an oilfield can be predicted. Through analyzing the error of the predicted results and nume-rical simulation technique testing, the prediction results...

: The prediction method of maximum fluid-withdrawal rate of oilfields introduced in this paper is to consider the cfevelopment system of an oilfield as a whole. Using the principle of material balance, a prediction method with a rather systematical development index is established. Using a certain pressure cut off, the maximum fluid-withdrawal rate of an oilfield can be predicted. Through analyzing the error of the predicted results and nume-rical simulation technique testing, the prediction results of this method is trus-tworthy.