Table of Content

20 January 2003, Volume 39 Issue 1

Previous Issue    Next Issue

Echo Analysis of An Multiple Thunderstorms Process in Chengdu Shuangliu Airport

SHEN Hongbin,TAO Zuyu,ZHANG Yi

2003, 39(1):  58-67. 

Asbtract ( )  

Related Articles | Metrics

23 thunderstorms occurred for twenty successive days from July to August, 2000. The weather situation are analyzed. Results show that they comprise 11 local heat thunderstorms and 12 systemic thunderstorms. The characteristic of the two kinds of thunderstorms echo have been analyzed and compared. It shows that there are obvious difference in their echo parameters、spatial and temporal distribution、original source、movement and evolution. The systemic thunderstorm are complex of organizational and systemic multiple cell. The life span of the thunderstorm consist of life span of every cell, so lifetime of them greatly longer than that of anyone convection cell. New cell is created and developed over confluence of cold downdraught and front warm current. The thunderstorms have been developed and maintained by means of this mechanism.

On the Automorphism Groups of Bi-Cayley Graphs

LU Zaiping

2003, 39(1):  1-5. 

Asbtract ( )  

Related Articles | Metrics

For a finite group G, and a subset S(possibly, contains the identity element) of G, the bi-Cayley graph BCay(G, S) of G with respect to S is defined as the bipartite graph with vertex set G×{0, 1} and edge set {{(g, 0), (sg, 1)}|g∈G, s∈S}. The automorphism group A of bi-Cayley graph BCay(G, S) is investigated, and the structure of N_A(R^r_l(G)) is given.

The Structure and Determination of the Set of Reversible Edges in a Directed Acyclic Graph

XU Jing,ZHENG Zhongguo

2003, 39(1):  6-13. 

Asbtract ( )  

Related Articles | Metrics

Authores have studied the structure of R_G, which is the set of reversible edges of a dag(directed acyclic graph) G and present the sufficent and necessary condition to determine R_G. This result can help to search the equivalent classes of a dag and be used in the learning of Bayesian Network.

Difference Sets with Classical Parameters and Bent Functions

XIONG Guohua

2003, 39(1):  14-16. 

Asbtract ( )  

Related Articles | Metrics

A class of bent functions in 2d variables is constructed, using difference sets with classical parameters in GF(2^d)^*.

On the p-Rank of Quadratic Residue Partial Difference Sets

DENG Yingpu

2003, 39(1):  17-21. 

Asbtract ( )  

Related Articles | Metrics

The author has obtained a result about the p-rank of partial difference sets: let q≡1 (mod 4) be a prime power, p be a prime such that p|(q-1)/4. Then the p-rank of the quadratic residue partial difference set in the field GF (q) is (q-1)/2.

Persistence and Global Stability for Nonautonomous Cooperative System with Diffusion and Time Delay

CHEN Fengde

2003, 39(1):  22-28. 

Asbtract ( )  

Related Articles | Metrics

A non-autonomous cooperative model with diffusion and continuous time delay is studied, where all parameters are time-dependent. The system, which is compose of two patches, has two species: one can diffuse between two patches, but the other is confined to one patch and cannot diffuse. It is proved that the system is uniformly persistent under appropriate conditions. Furthermore, sufficient conditions are established for global stability of the system.

Coherent Acoustic Sources in the Mixing Layer of A Planar Jet

SUN Zhili,YAN Dachun,NIE Jin

2003, 39(1):  29-34. 

Asbtract ( )  

Related Articles | Metrics

Experimental researches on coherent characteristics of sound generated by instability waves in the mixing layer of a planar jet under acoustic excitation are proceeded through the measurement of the coherent time scale. It demonstrates that the coherent time scale keeps a high level in the growing stage of coherent structures under the motivation of instability waves and then turning down abruptly at the breaking point where the large-scale eddies begin to shed downstream. It provides a criterion whether the instability wave or convective eddy becomes dominant in the contour map of the fluctuating velocity amplitude distribution with their particular expression of Lighthill stress.

Observator with Fuzzy Neural Networks for Monitoring the Operation-state of Transformer

CHANG Bingguo,YAN Lei,MAO Jietai,LIU Junhua

2003, 39(1):  35-39. 

Asbtract ( )  

Related Articles | Metrics

An observator is combined with fuzzy set theory and neural networks for monitoring transformer operation-state. It has overcome the limitations such as the dependency on experts for fuzzy rule and no self-adaptation for fuzzy set. The self-regulation of membership functions and the self-organization of fuzzy rule are realized by the self-learning of the neural networks. This approach is proven by experiments.

Characteristics of Barolicnic Wave Packets in GCM Data

WANG Minghuai,TAN Benkui

2003, 39(1):  40-50. 

Asbtract ( )  

Related Articles | Metrics

300hpa meridional wind data from a GCM experiment in GFDL were analyzed to document the characteristics of wave packets in GCM data. Utilizing the one-point lag correlation and the complex demodulation, authors computed some characteristic variables of wave packets. Results show that the wavelength is a few thousand kilometers. The phase speed is about 10m/s, and the group speed is about 2～3 times of the phase speed. It also shows that the downstream development of baroclinic wave in GCM data is more popular than that in the observational data, and that wave packets in GCM data are more coherent.

Analysis of Mesoscale Convective System in Hubei Province Heavy Rainfall during July 20～25, 1998

WU Qingli,LI Yaping,GAO Huilin,ZHENG Yongguang,LI Wanbiao

2003, 39(1):  51-57. 

Asbtract ( )  

Related Articles | Metrics

With 85.5GHz microwave images of Tropical Rainfall Measuring Mission(TRMM) Satellite, which has good ability to monitor convective heavy rainfall, and GMS satellite infrared images in 1h interval, the mesoscale convective systems in Yangtze river basin during July 20～25, 1998 was revealed and analyzed. The relationship between the distribution of heavy rainfall and the blackbody temperature(TBB) of GMS satellite infrared images was examined. The results suggest that the mesoscale features of the heavy rainfall was outstanding, and the maximum rainfall peak took place at the time when the MCS just developed to the meso-β scale. The diagnosis of the large-scale environment suggested that the thermal and dynamic conditions were favorable to the development of the mesoscale convective systems in the Yangtze River basin.

Study for the Electric Field in Crystal Planar Channeling with Thomas-Fermi Methods

LIU Yingtai

2003, 39(1):  68-72. 

Asbtract ( )  

Related Articles | Metrics

According to the transnational periodically symmetry of crystal plane in its space, author introduce the Thomas-Fermi equation in crystal planar channeling electric fields; then calculate the electric fields of single crystal Si(110) and its critical angle. The good fits with the experimental data are obtained. The results show that the Thomas-Fermi equation in crystal planar channeling may describe the characters of planar channeling.

Turbulence Length Scales, Dissipation Rates and Structure Parameters above the Forest Canopy

LIU Shuhua,HU Fei,LIU Huizhi,XU M,ZHU Tingyao,JIN Changjie

2003, 39(1):  73-82. 

Asbtract ( )  

Related Articles | Metrics

The turbulent data were measured using three-dimensional sonic anemometers/thermometers above a forest canopy, in the Changbai Mountains of northeast China. Turbulence length scales, dissipation rates and structure parameters above the forest canopy were calculated using the eddy correlation method. Results show that the turbulence characteristic length scales for momentum are negative interrelated with Z/L number; the turbulence characteristic length scales for heat is positive interrelated with Z/L number in unstable air and that is negative interrelated with Z/L number in stable air. The agreement between the momentum and heat dissipation rates calculated directly from the w spectrum(the turbulence spectral method)and indirectly from equations(15)(16)are quite good. The dimensionless turbulence structure functions C²_vz^2/3σ_w^-2 and C²_Tz^2/3σ_T^-2 are functions of Richardson number in stable and unstable air. Turbulence structure parameters C²_T has a direct linear bearing on the sensible heat flux w'T'.

Classification of Cloud Using GMS-5 Infrared Data

ZHOU Wei,LI Wanbiao

2003, 39(1):  83-90. 

Asbtract ( )  

Related Articles | Metrics

Based on the difference characters of cloud, cloud classification methods are presented by using GMS-5 data, and results of cumulonimbus, cumulus congestus, cirrus, cumulus, middle cloud, dense cloud are obtained. The comparison with the ground observation data of Shouxian (Anhui Province of China) in June and July(1998) shows a satisfied results, with an accuracy of nearly 70%.

Probabilistic Erasing of Quantum Information

ZHANG Hongtao,ZENG Jinyan

2003, 39(1):  91-97. 

Asbtract ( )  

Related Articles | Metrics

According to the superposition principle of quantum states, an arbitrary quantum states can not be deterministically erased(Pati & Braunstein), but may be probabilistically erased. Similar to the probabilistic cloning of quantum states by Duan & Guo, in this paper a probabilistic erasing scheme is developed, i.e., two non-orthogonal states secretly chosen from a certain set {|ψ₁〉, ψ₂〉} can be probabilistically erased through a unitary transformation U in combination with a subsequent measurement M. The differences in characters and efficiencies between probabilistic cloning and erasing are discussed.

Design Issues of An IP Wavelength Router

LI Jingcong,LI Zhengbin,WU Deming,XU Anshi

2003, 39(1):  98-104. 

Asbtract ( )  

Related Articles | Metrics

The network architecture where each node integrates an IP router and an OXC is an attractive paradigm for the next generation optical Internet. IP wavelength routing, which includes two types of switching and forwarding hierarchies (packet and lambda) in the GMPLS field, is based on this kind of architecture. This paper addresses the design issues of an IP wavelength router. Based on analyzing the problems and shortcomings of the previous general node structure, a novel node structure is proposed, which overcomes the problems encountered by the previous scheme. Two IP switching protocols, IFMP and GSMP, are extended to support IP wavelength routing networks. The flow classifiers, which are main components of these node structures, and the performance metrics of these structures, are also discussed.

Symbol Scattered Spreading Technique for CDMA

JIAO Bingli,XIAO Dengwei

2003, 39(1):  105-111. 

Asbtract ( )  

Related Articles | Metrics

A new spreading scheme is introduced for nullifying the multi-access interference(MAI)for CDMA systems. For the synchronous systems, this scheme can keep the orthogonality among the codes used to different users in multipath environments and, therefore, cancel the MAI completely. In alternation, the multi-symbols of a user are overlapped and can, however, be calculated. The simulation shows the effectiveness of this approach for reducing bit error rate(BER) while the system throughputs remain unchanged. In addition, the band efficiency is also discussed.

Magnetic Tomography in the Central Bohai Sea of China

HOU Guiting,QIAN Xianglin,SHI Ge,LIU Changfeng

2003, 39(1):  112-117. 

Asbtract ( )  

Related Articles | Metrics

The central Bohai Sea is one of the thinest lithosphere in eastern China where strike-slip and extension faults are very intensive with intensive magmatic activity, including the volcanic rocks and intrusion, which show the conspicious high positive magnetic anomalies. The spatial distribution, shape and property of high magnetic anomalies in the central Bohai Sea are inversed by the magnetic tomography, based on the analysis of regional geology and seismic sections in the Bohai basin.

Conodont Stratigraphic Evidence for the Age of the Guanling Fauna, Guizhou Province, China

SUN Zuoyu,HAO Weicheng,JIANG Dayong

2003, 39(1):  118-125. 

Asbtract ( )  

Related Articles | Metrics

Samples collected from the Wayao Formation, which yields the Guanling Fauna, and the underling formation, the Zhuganpo Formation, were treated for conodont analysis. The study result shows that two conodont zones, Paragondolella polygnathiformis-P.tadpole Assemblage Zone and the P. polygnathiformis Zone can be recognized. Comparing with the international and domestic related information, a conclusion can be drawn that their epoch should belong to the Middle or Late Carnian of the Late Triassic. So the final result indicates that the age of the Guanling Fauna belong to the middle Carnian of the Late Triassic, maybe the late Carnian, not to the Ladinian of the Middle Triassic.

The Relative Strength of Phonological Activation between Complex Characters and Their Phonetic Radicals in Reading Chinese

ZHANG Yaxu,ZHOU Xiaolin,SHU Hua,XIANG Hongbing

2003, 39(1):  126-133. 

Asbtract ( )  

Related Articles | Metrics

Most Chinese characters are complex characters that are composed of a semantic radical on the left and a phonetic radical on the right. The phonetic radicals can provide cues for the pronunciation of whole characters. Regular characters contain phonetic radicals that are pronounced in the same way as the whole characters, while irregular characters have phonetic radicals in different pronunciations. Subjects in this study were asked to name whole characters or their phonetic radicals when the regularity of complex characters was manipulated. Regularity effects in these two tasks were examined to investigate the competition between phonological activation of the irregular whole characters and their phonetic radicals. It was found that for high frequency irregular complex characters, phonological activation of whole characters interfered with that of their phonetic radicals, but not vice versa. For low frequency irregular complex characters, phonological activation of complex characters and their phonetic radicals interfered with each other, although the effect in naming radicals was stronger than the effect in naming whole characters. These results suggest that phonological activation of high frequency complex characters is faster than the activation of their phonetic radicals. Moreover, low frequency complex characters have higher level of phonological activation than their phonetic radicals, although these two phonological representations may have been accessed at the same time.

Theory of Meridian Science

ZHANG Renji,PAN Qili

2003, 39(1):  134-143. 

Asbtract ( )  

Related Articles | Metrics

Theory of Meridian-Cortical-Viscera Interrelationship suggests Meridian (Jinguo) is an individual system. Meridian Science was founded based on biological experimentation in early Chinese medicine. The Jingluo Bronze acupuncture statue (circ Song dynasty 1027 BC), which is the bases of traditional Chinese Acupuncture, has revealed 4-Dimensional structural lines along the human body that corresponds to lines of neurobiologically active sites. The primary focus of Meridian Science is the investigation of the regulatory process in the human body. From scientific studies there seems to be correlation between the intercellular space in the biological model and Meridian pathways. Thus, Meridian Science could provide insights into the mechanism of Tradition Chinese Medicine, with potentially great benefits to human health care. There two primary categories of studies in Meridian Science, 1) the study of the effects of Chinese herbs and medicines on the human body and 2) the study of the physiological and psychological effects and mechanism of Meridian lines and pathways. Specifically, the phenomenon of Acupuncture and Meridian pathways can be illustrated by a bi-directional feedback loop that crosses vertebrates segments along the human body and the perceived sensation of the stimulus by the human brain, or even caused by Qigong. The theory of Meridian Science bases on :(1) Yin Yang of human body and various components of the environment; (2) coordination between life and universe; (3) circulation of Qi and body fluid in the Meridian pathway to regulate the visceral organs. The basic concepts of Meridian Science include: (1) identity structure; (2) time in Meridian circulation; (3) space on Meridian architecture; (4) death and life; (5) dominance and recessiveness in the Meridian pathway sensation; and (6) entirety function in human body.