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Tsinghua Science and Technology

Issue 6 • Date Dec. 2003

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Displaying Results 1 - 23 of 23
  • [Front cover]

    Publication Year: 2003, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (435 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 2003, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (134 KB)
    Freely Available from IEEE
  • Universal rendering mechanism supporting dual-mode presentation

    Publication Year: 2003, Page(s):641 - 650
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1650 KB)

    XML is a standard for the exchange of business data that is completely platform and vendor neutral. Because XML data corres in many forms, one of the most important technologies needed for XML applications is the ability to convert the data into visible renderings. This paper focuses on the rendering of XML/XSL documents into a readable and printable format by means of a platform-independent proce... View full abstract»

    Open Access
  • Peer-Paired collaboration for on-demand streaming applications and an improved error recovery technique

    Publication Year: 2003, Page(s):651 - 657
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1341 KB)

    Previous studies on streaming media networks have mainly focused on how to conserve the network bandwidth, especially the Internet backbone bandwidth, while maintaining a desired quality. This paper tackles the problem from another perspective, trying to improve the individual streaming quality while not increasing the backbone traffic. Specifically, we apply a peer-paired collaborative streaming ... View full abstract»

    Open Access
  • Class-Based garbage collection in object-oriented programming environments

    Publication Year: 2003, Page(s):658 - 666
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1399 KB)

    Many garbage collection algorithms have been proposed, but few address the special needs of long-running server programs. Server applications usually run for years and spawn many threads, so they create and discard thousands of objects. Therefore, efficient garbage collection is especially important for those applications. This paper presents a class-based garbage collector for object-oriented pro... View full abstract»

    Open Access
  • Nonlinear time-frequency distributions of spectrum energy operator in large vocabulary mandarin speaker independent speech recognition system

    Publication Year: 2003, Page(s):667 - 671
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (779 KB)

    This work demonstrates the use of the nonlinear time-frequency distribution (NLTFD) of a discrete time energy operator (DTEO) based on amplitude demodulation modulation demodulation techniques as a feature in speech recognition. The duration distribution based hidden Markov module in a speaker independent large vocabulary mandarin speech recognition system was reconstructed from the feature vector... View full abstract»

    Open Access
  • Identification of transient and permanent faults

    Publication Year: 2003, Page(s):672 - 675
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (519 KB)

    A new algorithm was developed for arcing fault detection based on high-frequency current transients analyzed with wavelet transforms to avoid automatic reclosing on permanent faults. The characteristics of arc currents during transient faults were investigated. The current curves of transient and permanent faults are quite similar since current variation from the fault arc is much less than the vo... View full abstract»

    Open Access
  • Robust H control of Hamiltonian system with uncertainty

    Publication Year: 2003, Page(s):676 - 680
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (752 KB)

    This paper investigates the robust H problem for a class of generalized forced Hamiltonian systems with uncertainties. The robust L2-gain was proved for the Hamiltonian with a sufficient condition for stable control of multimachine power systerrs expressed as a matrix algebraic inequality. A similar sufficient condition was then extended to the robust H contrd of Hamiltonian systerrs to... View full abstract»

    Open Access
  • PIV experimental investigation on the flow in a model of closed pump sump

    Publication Year: 2003, Page(s):681 - 686
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (744 KB)

    Vortices in the flow of a pump sump present an important problem in pump station operation. In the present study, the flow patterns in two model pump sumps with specially designed structures are analyzed using the particle image velocimetry (PIV) technique. The data is analyzed to reveal a number of parameters including the internal flow field with velocity distribution, the streamline distributio... View full abstract»

    Open Access
  • Unburned carbon loss in fly ash of CFB boilers burning hard coal

    Publication Year: 2003, Page(s):687 - 691
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (824 KB)

    The unburned carbon loss in fly ash of circulating fluidized bed (CFB) boilers, most of which are burning active fuels such as lignite or peat, is norrrally very low. However, most CFB boilers in China usually burn hard coals such as anthracite and bituml nous coal and coal wastes, so the carbon content in the fly ash from these boilers is higher than expected. This paper investigates the source o... View full abstract»

    Open Access
  • Mixed model for silt-laden solid-liquid two-phase flows

    Publication Year: 2003, Page(s):692 - 696
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (784 KB)

    The kinetic theory of molecular gases was used to derive the governing equations for dense solid-liqud two-phase flows from a microscopic flow characteristics viewpoint by multiplying the Boltzrrann equation for each phase by property parameters and integrating over the velocity space. The particle collision term was derived from microscopic terms by corrparison with dilute two-phase flow but with... View full abstract»

    Open Access
  • Parallel simulation of 3-D turbulent flow through hydraulic machinery

    Publication Year: 2003, Page(s):697 - 701
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1046 KB)

    Parallel calculational methods were used to analyze incompressible turbulent flow through hydraulic machinery. Two parallel methods were used to simulate mulate the complex flow field. The space decorrposition method divides vides the computational domain into several sub-ranges. Parallel discrete event simulation divides the whole task into several parts according to their functions. The results ... View full abstract»

    Open Access
  • Accuracy analysis and calibration of gantry hybrid machine tool

    Publication Year: 2003, Page(s):702 - 707
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (942 KB)

    The kinematic accuracy is a key factor in the design of parallel or hybrid machine tools. This analysis improved the accuracy of a 4–00F (degree of freedom) gantry hybrid machine tool based on a 3-DOF planar parallel rranipulator by corrpensating for various positioning errors. The machine tool architecture was described with the inverse kinematic solution. The control pararreter error mode... View full abstract»

    Open Access
  • Sediment deposition pattern and flow conditions in the Three Gorges reservoir: A physical model study

    Publication Year: 2003, Page(s):708 - 712
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (852 KB)

    Sedimentation in the Three Gorges Peservoir will greatl y affect future project functions, such as power generation and navigation, after 50 years of operation. This paper presents results of a physical model study, which indicate that the capacity of both the discharge tunnel and the power plant outlet could be impaired by sediment deposition in front of the dam after 50 years, affecting both the... View full abstract»

    Open Access
  • Numerical simulation of open-channel flow in 90-degree combining junction

    Publication Year: 2003, Page(s):713 - 718
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (933 KB)

    Combining flows often occur in open channel networks of drainage systems and river engineering Open-channel junction flows were analyzed yzed by solving the depth-averaged two-dirrensional, elliptic Reynolds-averaged Navier-Stokes equations with the Hanalic-Launder (H-L) modification to the k-ε turbulence model without the free surface rigid lid” approximation on with an finite-volum... View full abstract»

    Open Access
  • Flow simulation of urban sewer networks

    Publication Year: 2003, Page(s):719 - 725
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1044 KB)

    Flow in an urban drainage network is usually unsteady with backwater near junctions. The routing of hydrographs through a network is an important aspect of the design and analysis of urban drainage networks. Various numerical methods to analyze flow in urban drainage networks were compared and a new hybrid interpol scheme was developed which combined time-line reachback interpolation, implicit int... View full abstract»

    Open Access
  • Determination of concrete fracture parameters from a three-point bending test

    Publication Year: 2003, Page(s):726 - 733
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1225 KB)

    The mechanical behavior within the processing zone of concrete material can be well described by the crack bridging performance. The material properties related to the crack bridging are cracking strength, tensile strength, and the stress-crack width relationship. In general, the cracking strength is lower than the tensile strength of concrete. Crack propagation is governed by the cracking strengt... View full abstract»

    Open Access
  • Applyilg global positioning system real-tine kinematic technology to collection and analysis of rowing information

    Publication Year: 2003, Page(s):734 - 737
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (614 KB)

    To obtain higher accuracy of infonnation concerning boat motion, the use of global positioning system (GPS) real-tine kinematic (RTK) technology was investigated. Through RTK technology, a measurement precision of the ± 1 cm range can he achieved The research equipment included a GPS receiver and a personal digital assistant as a data control and processing unit Real-tine GPS data was captu... View full abstract»

    Open Access
  • Sensor network design for nonlinear processes

    Publication Year: 2003, Page(s):738 - 743
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (884 KB)

    This paper presents amethod to design a cost-optimal nonredundant sensor network to observe all variables in a general nonlinear process. Arnixed integer linear programming model was used to minimize the cost with data classification to check the observability of variables. This work is a starting point for designing sensor networks for general nonlinear processes based on various criteria, such a... View full abstract»

    Open Access
  • Vitamin E processed using methylation of non-α-tocopherol

    Publication Year: 2003, Page(s):744 - 748
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    Vitamin E is a group of naturally-occurring compounds often chemically elucidated as a series of homologues mainly consisting sting of α− β−, γ− and δ− tocopherols. All of those compounds show the biological function of tocopherd while α-tocopherol exhibits the strongest. To improve its biological function, non-α-tocopherol can ... View full abstract»

    Open Access
  • Preparation and performance of bipolar membranes with liquid ion-exchange medium

    Publication Year: 2003, Page(s):749 - 751
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (685 KB)

    The current density is rather low in solid bipolar membranes, because the water transfer r ate is relatively slow across solid bipolar membranes made of solid ion-exchange materials. This paper describes the use of pdymer solutions, such as phosphatic pdy(vinyl alcohd) sdution, poly(acrylic acid) solution and pdy(vinyl alcohol) solutions with dispersed cation/anion-exchange resin particles to prep... View full abstract»

    Open Access
  • Kinetics of growth and nutrient consumption in the culture of Trichosanthes kirilowii hairy root

    Publication Year: 2003, Page(s):752 - 755
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (584 KB)

    Hbosorre-inactivetirq proteins in Trichosanthes kirilowii having high anti-HIV activity can be efficiently obtained by culturing Trichosanthes kirilowii hairy root. A hairy root line from Trichosanthes kirilowii was cultivated in flasks and in a 5-L bioreactor. The results show that a logistic equation can be used to describe the relationship between the hairy root biomass and the culture time. Th... View full abstract»

    Open Access
  • An analytic equation of state Based on SAFT-CP for bilary non-polar alkane mixtures across the criticalitical point

    Publication Year: 2003, Page(s):756 - 759
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (583 KB)

    The description using an analytic equation of state of thermodynamic properties near the critical points of fluids and their mixtures remains a challenging problem in the area of chemical engineering Based on the statistical associating fluid theory across the critical point (SAFT-CP), an analytic equation of state is established in this work for non-polar mixtures With two binary parameters, this... View full abstract»

    Open Access

Aims & Scope

Tsinghua Science and Technology (Tsinghua Sci Technol) aims to highlight scientific achievements in computer science, electronic engineering, and other IT fields. Contributions all over the world are welcome.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Professor Jiaguang Sun
School of Software
Tsinghua University
Beijing  100084 China
journal@tsinghua.edu.cn
Phone:86-10-62771385