④ Gravity variation distribution in high negative value region is just consistent with the second shear strain′s high value region of strain field obtained from GPS observation.

While its spatial distribution was gobbet, with the high value region (>0.25 mg kg~(-1)) mainly existed in and around the downtown of Chengdu, which was gradually decreased to the edge of Chengdu Plain.

The results show that:(1)Most of the earthquakes of Ms≥5.0,especially about and over 6 magnitude, took place in or near the high vaule region and its margins of shear strain rate or superficial expansion rate of regional strain field,especially high value region of shear strain rate in accordance with main fault;

If cos θ≥3~(1/2)/2,the switching inactive can be set in the peak value region of the load current,so the switching loss can be greatly reduced,if cos θ<3~(1/2)/2,the effect of reducing switching loss will be somewhat decreased. This has been shown in the simulation results. In addition,this reducing switching loss PWM technique has characteristic of simple calculation and easy realization.

On the basis of the contrast research on infinitude no dimension method,affirmatory method of weight modulus and comprehensive evaluation method,we come up with the conclusion of changing the value region of method of effect coefficient from[60,100] into[0.4,1] throush,no demention method which corresponds to the comprehensive evaluation method;

The T_4 .TSH concentration in the cord blood serum of 2007 cases of newbornx in Qingdao region was analysed to study the incidence of congenital hypothyrosis and its normal value region.

Among several conservation tillage ways, the most low soil bulk density was the no-tillage for four year and half cover (F) in Wenjiang district which was only 1.19g/cm~3. Compared with convention tillage, the soil bulk density value reduced 13.77%. While the highest value region lied in Zhongjiang County.

The authors established a new method for determination of m一AST in serum The advantages of the proteolytic assay are accurate,convenient,swift. economical and suita ble for automation This method adopted the condition of AST assay recommended by IFCC,and can obtain the activaty of c一AST indriectly,CV of the method is 2.24%,the nonnal value region is 7.60±3.62 U/L.

Comparison of experimental data with theoretical calculations gives us the opportunity to choose a value region of the values for the physical parameters interesting for us for each material under investigation.

Find the region with high value region and mark its centroid as laser pointer position.

Coronary calcification was measured by use of the Base Value Region of Interest software, and regions of interest were confirmed manually.

A new objective analysis method based on the surface fitting by D. Shepard is presented in this paper.It has the feature of the method to sim-ulate artificial analysis.In the process,meteorological principle is observed, and some people's experiences are drawn.The difference from the others is to divide the procedure of artificial analysis into several stages and simulate them bit by bit. In mathematics, that is,a field of physical quan-tity is described by means of a piecewise continuous compound function....

A new objective analysis method based on the surface fitting by D. Shepard is presented in this paper.It has the feature of the method to sim-ulate artificial analysis.In the process,meteorological principle is observed, and some people's experiences are drawn.The difference from the others is to divide the procedure of artificial analysis into several stages and simulate them bit by bit. In mathematics, that is,a field of physical quan-tity is described by means of a piecewise continuous compound function. Due to adopting the technique of piecewise design, a lot of main ad-vantages can be summed up from other objective analysis methods now available, such as: ( 1 )a preliminary field is unnecessary, ( 2 )the station records are unchanged in the result, ( 3 )it can make a reasonable value higher (lower) than adjacent stations on general net point which is in the centre of high (low) value region, etc .Moreover, it also can use inconven-tional data conveniently and deal with missed records flexibly, therefore this method may be supplied to practical operation.

In this paper, the theoretical model for the developing earthquake reedia has been propsed and the mechanics relations and motion equation intwo-phase media have been established. The properties of two-kind p-waves in the developing earthquake media have been demonstrated. The authors have studies also the reflective and refractive coefficients for propagation of seismic waves in the layered multi-phase media. The methods for selecting parameteres have been discussed and The displacement field in the developing...

In this paper, the theoretical model for the developing earthquake reedia has been propsed and the mechanics relations and motion equation intwo-phase media have been established. The properties of two-kind p-waves in the developing earthquake media have been demonstrated. The authors have studies also the reflective and refractive coefficients for propagation of seismic waves in the layered multi-phase media. The methods for selecting parameteres have been discussed and The displacement field in the developing earthquake media calculated. Specifically, for instance, the aarbors have analyses the temporal and spatial characteristics of the amplitude ratio, including those of the imminept shock anomaly before and after the Haicheng earthquake of February 4. 1975 Finally, theamplitude ratio anomaly is interpreted preliminarily from the point of view of physical implication.Theoretical and practical results show that (1) The seismic velocities, amplitudes and waveforms may variate when they travel throh the developing earthquake media, especially, the variations of the p-amplitude are bigger. The variations of amplitude ratio depend mainly on the variations of p-amplitude. In the two-phase media with gas saturation, the p-amplitude is bigger than in the solid-phase, oppositely, in the two-phasemedia with liquid-saturation the p-amplitude is less than in the solid-phase. (2)The forms of the temporal variation before and after the Haicheng earthquake appeared as follows: lower value and then revalue—higher and stable value—occurence of shock-falling. The spatial variation was that the amplitude ratio in the periphery was lower, in the middle higher, the fringe on the high-value region was a dangerous region of major shcok. (3) The amplitude retio increased sharply before imminent shock and earthquak occured when the amplitude peak was falling. The time for appearing peak depended on the epicentral distance and azimuth Generally, it appeared in periphery and in some position at first and then in epicentral area. Based on the preceding coclusions the possibility that the amplitude ratio as a pre cursor may be applied toearthpuakes prediction has increased.

The existence of oscillation in a state of stability of dx/dt=A(t)x + g(t) (2) has been discussed in [1], [2], and [3]、 This paper aims to establish a sufficient condition of existence, uniqueness, and stability of periodic solution with period ω of dx(t)/dtC(t)x(t)+B(t)x(t-τ) +f(t) (1) using the Liapunov funetion's analytic method and Schauder's fixed point principle, For system(1), the authors have provided the slowly varible bownd of subsystem, boundary of value region of correlation, and subbound for...

The existence of oscillation in a state of stability of dx/dt=A(t)x + g(t) (2) has been discussed in [1], [2], and [3]、 This paper aims to establish a sufficient condition of existence, uniqueness, and stability of periodic solution with period ω of dx(t)/dtC(t)x(t)+B(t)x(t-τ) +f(t) (1) using the Liapunov funetion's analytic method and Schauder's fixed point principle, For system(1), the authors have provided the slowly varible bownd of subsystem, boundary of value region of correlation, and subbound for time lagτ, All of the estimated formulas are more convenient to use in practical engineering or physics.