Table of Content

20 May 1999, Volume 34 Issue 3

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The Construction of a Class of Bent Sequences

WANG Zhangxiong

1999, 35(3):  311-316. 

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By constructing a special class of matrices called M-type matrices, this paper has proved that the sequence gaining from concatenating the rows of a M-type matrix is a bent sequence and therefore generalized the results of [1] and [2].

The Dynamic Coupling of Right Ventricle and Pulmonary Arteries

WU Wangyi,WEN Gongbi,YAN Zongyi,WANG Yingxiao,ZHANG Zirong

1999, 35(3):  317-327. 

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Based on the anatomical structure of pulmonary arteries, a slightly asymmetric T-tube model with distributed parameters is proposed herein to simulate the pulmonary arteries. Comparison between our calculated input impedance to the pulmonary arteries with available experimental data proves that such a model provides an excellent simulation to the right ventricular afterload. With a E(t)-R model for the right ventricle and a slightly asymmetric T tube model for the pulmonary arteries, the dynamic coupling of the right ventricle and pulmonary circulation is quantitatively studied using the impulse response method. The influence of various cardiovascular parameters is discussed. It is found that the right ventricle plays a predominant role over the pulmonary arteries in determining the pulmonary blood pressure and flow variations during a cardiac cycle.

A Note on Menon Difference Sets

WAN Zhaoze

1999, 35(3):  281-284. 

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It is proved that there exist no Menon difference sets in groups of order 4p²(p=5, p=3(mod 4)) with homomorphic images Z₄×Z_p and point out that the Turyn's exponent bound can be improved in certain case.

The Geometry of the Differential Equations of the Fourth Order Under the Contact Transformations

CHEN Weihuan,LI Haizhong

1999, 35(3):  285-296. 

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It is studied that the geometry of the differential equations of the fourth order y⁽⁴⁾=f(x, y, y', y", y''') under contact transformations by E.Cartan's method of equivalence.

Intersection Theory on Homogeneous Spaces of Simple Lie Group

BAO Zhiqiang

1999, 35(3):  297-301. 

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Consider H^*(U_n/T_n, Z), the integral cohomology ring of homogeneous space U_n/T_n. It is a quotient ring of the polynomial ring in n variables. Particularly, the homogeneous part with degree d=dimU_n/T_n corresponds to the highest dimensional cohomology group Z, i.e., each degree d homogeneous polynomial f corresponds to an integer χ(f). The present article computes this correspondence explicitly. The connections with the intersection theory of the manifold U_n/T_n are also discussed. Similar result applies to the homogeneous space Sp_n/T_n.

The Asymptotic Formula of the Basic Function in the Sieve Method

MENG Zaizhao

1999, 35(3):  302-310. 

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The paper gives new estimation to the error term of the asymptotic formula of the basic function F(u) in the sieve method; in addition, we give a counter-example to one incorrect result in the reference.

The Dynamic Coupling Model for the Whole Circulation in Human Body

WU Wangyi,WANG Yingxiao,YAN Zongyi,WEN Gongbi

1999, 35(3):  328-339. 

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The cardiovascular system is a complex coupling system, which consists of interacting parts constituting an indivisible integrity. In this paper, the E(t)-R model is adopted for the left and right ventricles, a newly-developed T-Y tube model with distributed parameters is adopted for the systemic arteries, and a newly-developed slightly asymmetric T tube model with distributed parameters is adopted for the pulmonary arteries. Then, the impulse response method and the flow conservation law are employed to simulate the dynamic coupling of the whole circulation in human body. Our computed theoretical results fit well to the available measured data.

Experimental Study on The Instability and Transition of the Natural Convection Boundary Layer

TAO Jianjun,YAN Dachun

1999, 35(3):  340-345. 

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The instability and transition process of the natural-convection boundary layer around a vertical heated isothermal flat plate was investigated experimentally. It demonstrates that the characteristics of the unstable wave, measured at the flexion point in the velocity profile, consist with the results of linear stability theory. After an initial growth of its low frequency components, the comparatively higher frequency components develop and become to be turbulentized subsequently with a buoyancy subrange in its power spectra. In the inner sublayer, a new disturbance signal and its subharmonics in a much higher frequency domain were discovered near the wall and an inertial subrange was observed by its high frequency side in the spectra at Gr≈378.6.

Supersymmetry and Shape Invariance of the Ring-shaped Oscillator Potential

QIAN Shangwu,HUANG Bowen,WANG Deyun,GU Zhiyu

1999, 35(3):  346-350. 

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This article shows that in spherical polar coordinates, the ring-shaped oscillator potential has supersymmetry and shape invariance in the r dimension and in the θ dimension, it obtains the energy eigenvalues and energy eigenfunctions of this potential.

The Calculation of Pole Parameters in RFQ Accelerator

WU Yu

1999, 35(3):  351-355. 

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The process of the calculation of pole parameters of 26MHz 1MeV O⁺ RFQ accelerator in Peking University was given. This process includes the calculation of those parameters in the main part, the radial matching section and the Crandall unit. The calculated results were given at the same time.

Quasi-balanced Dynamic Structure of Tropical Cyclone

SUN Feng,LIU Shikuo

1999, 35(3):  366-374. 

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Tropical cyclone is divided into inner and outer regions in which the scale of time-space and physical quantity are all different. Making use of the scale analysis and perturbation method on the two regions of tropical cyclone the governing equations of baroclinic models are obtained respectively. The inner region is governed by cyclic wind while the outer region by gradient wind, but the governing equations are similar, they can be solved analytically by the same equations. The obtained structure of the stream and pressure fields consistents approximately with observations.

Numerical Experiments on One-dimensional Ice-phase Cloud Parameterized Model

SANG Jianguo,MIAO Yingyu,WEN Shigeng

1999, 35(3):  356-365. 

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A series of numerical experiments has been carried out for an one-dimensional ice-phase cloud parameterized model. The results show that the changes of the atmospheric conditions such as water vapor content, ascending velocity as well as vertical diffusivity exert significant influences on the output of the hydrometers and their production rates, while the production terms are not sensitive to the choice of parameters in the model.

The Climatic Effects Due to Atmospheric Aerosols in Zero-dimensional Energy Balance Climate Model

XIN Guojun

1999, 35(3):  375-382. 

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In this paper, the increment in atmospheric absorption coefficient is assumed to be a linear function of the increment in clear sky albedo due to the aerosols. A sensitive parameter is introduced for representing the linear proportional coefficient associated with the distribution, the physical and chemical properties of the aerosols. The influence of cloudy amount on the radiation transfer and nonlinear interaction among the various climatic feedback are also included in the zero dimensional radiation energy climate model. For studying the playing role of atmospheric aerosols in the climatic change, the dependence of model equilibrium on the model parameters is investigated. The calculation results show that if the aerosol content increases, (1) the atmospheric temperature will increase, while the sensible and latent heat flux will decrease. So the global drought will appear; (2) the variation of in surface temperature associates with the clear sky albedo and the aerosol property (spetral distribution, physical characteristics, optical depth and so on). An increase of the mechanism of surface feedback would strengthen the climatic effects due to atmospheric aerosols.

Scattering of Multilayered Eccentric Cylinder with Multiple Cylinders inside: Microwave Equivalent Network Approach

ZHANG Yaojiang,GONG Zhonglin,XU Chenghe

1999, 35(3):  383-390. 

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Electromagnetic scattering from a multilayered eccentric dielectric circular cylinder with multiple cylinders inside is solved by an equivalent network formed by hybrid Aggregated T-matrix Method and Generalized Scattering Matrix approach. The T-matrix of multiple cylinders is obtained by Aggregated T-matrix Method and served as the reflection matrix of the network. Every layer-boundary is represented as a generalized S-parameter matrix in which first-kind Bessel functions and second-kind Hankel functions are used as the expansion modes and Addition Theorem of cylindrical harmonics is employed to connect the S-parameters together. The cylinder's RCS of TM and TE, as well as the near field distribution are presented.

Positron Annihilation Study of Metal Particles-Matrix Thin Film (Ag-BaO)

LI Lijun,WU Jinlei

1999, 35(3):  391-394. 

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There are different kinds of microstructure defects in metal particles-matrix complex thin films. In order to study these defects we produced complex thin film of Ag particles embedded in BaO matrix. The samples were annealed at different temperature. The mean positron annihilation lifetime of the samples decreased as the annealing temperature raised. It indicates that the structure condition of the interface between Ag particles and the matrix had been improved by annealing.

Study on the Performance of A New SCM System

XIONG Guisheng,XU Chenghe,WU Deming,XU Anshi

1999, 35(3):  395-401. 

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Performance of a new SCM systems based on microwave-optical mixing has been studied. The result shows that it is a good system of transmission FM CATV signals but not good for the VSB-CATV signals.

Propagation Loss for Radio Wave over Rough Sea Surface with An Knife-edge Obstacle

RAO Qinjiang,GONG Zhonglin,XU Chenghe

1999, 35(3):  402-408. 

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To study the influence of rough sea surface and a knife-edge on coast radar wave propagation, a reflection coefficient is introduced, which is suitable for rough sea surface, and substitute it into the propagation loss formula for rough sea surface and for a knife-edge, respectively. The results show that reflection from rough sea surface is an important factor in calculating propagation loss over rough sea and a knife-edge in the presence of rough sea surface.

The Omitting Type Theorem in Lattice-valued Model Theory of L(Q)

WANG Hanpin,XIE Huiyang

1999, 35(3):  409-413. 

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The two-valued weak model of the first order logic with generalized quantifier Q is generalized to be valued in complete weak complemented lattices. For finite linearly-ordered weak complemented lattice, the omitting type theorem is proved.

The Structure and Measurement of Self-efficacy

WANG Lei

1999, 35(3):  414-420. 

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The goal of this study is to establish a test to measure Self-efficacy. One hundred and forty-nine college students participated in the study. Subjects were asked to rate if each item of an author-designed Self-efficacy Inventory (SEI) could be used to describe themselves on a 6-point scale with "1" representing "extremely not appropriate" and "6" representing "extremely appropriate". Rotter Internal-external Control Scale, Self-discrepancy, Chinese SCL90 Depression Sub-scale, and Sherer's Self-efficacy Scale were tested as well. The same subjects were tested with SEI again two weeks later. The results shown that 19 items were chosen to compose the final SEI test, of which the mean score of the sample was 63.09 while standard deviation was 12.645. There was no significant sex difference (t=0.14, P=0.88). Factor Analysis revealed one factor which explained 32.4% of the total variance. The test met the basic reliability requirements with Cronbach a=0.878 and r=0.817 for test-retest reliability, and was significantly and negatively correlated with Rotter Internal-external Control Scale (r=-0.511, P<0.001), actual-ideal self-discrepancy (r=-0.420, P<0.001), actual-ought self-discrepancy (r=-0.450, P<0.001), and depression (r=-0.398, P<0.001). This test was also significantly correlated to Sherer's Self-efficacy Scale with r=0.6140 (P<0.0001) to its general efficacy and r=0.5379 (P<0.0001) to its social efficacy.

The Effects of Selective Attention on ERPs Elicited by Visual & Auditory Deviant Stimuli

XIAO Jian,HUANG Wei,WEI Jinghan

1999, 35(3):  421-428. 

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The effects of deviant visual and auditory stimuli on event-related potentials were investigated in an intermodal oddball task. Tones of different pitch were used as auditory stimuli (standard:1000Hz, 85%, deviant 800Hz. 15%) and various single Chinese words and simple geometric figures were used as visual stimuli. Auditory and visual stimuli were presented sequentially to subjects at randomized ISI of 700-1300ms. The subjects were instructed to attend visual channel and ignore the auditory in one block and to attend auditory and ignore visual in the other with key-responses to the current attended stimuli. Results showed the deviant auditory stimuli elicited similar mismatch negativity (MMN) in both attended and unattended conditions. MMN's independence of attention in auditory modality may reflect the automatic processing of auditory sensory inputs. In the visual modality, the deviant stimuli elicited no MMN or MMN-like component in both conditions because of the parallel processing system of visual modality and its difficulty of establishing the memory trace. The enhanced P300 elicited by the auditory and visual deviant stimuli in active condition may reflect the representation updating of work memory. The results were consistent with Naatanen's observation on MMN.