Science & Technology Review CONTENTS

Vol.25  No.19  2007 (Sum No. 241)

This issue published on 10. Oct., 2007

Forward

1  To Be a Trusted Scientist

HUO Yuping

News Round

7  Questioning Scientists Social Responsibilities

SU Qing

Suggestion

8  The Chinese Strategy of Burns Medicine, etc.

Articles

17  Mathematical Model for Studying Dust-removal Efficiency in Sprayer of Limestone/Gypsum Wet Flue Gas Desulfurization System in Power Plants

YUAN Yongtao, QI Liqiang, YUE Huanling

Abstract: According to the typical process and the design parameters of a limestone/gypsum wet flue gas desulfurization system and the gas flow condition in sprayer, the dust removal mechanism and the main influencing factors, including inertial impact, trapping and Brownian diffusion in the sprayer, are analyzed. A mathematical dust-removing model for counter-current spray tower is established, and it is applied in the project to verify the technologies against the emission standard in power plants burned with Zhungeer coal.

Key Words: FGD; dust-removing efficiency; math ematical model

CLC Number: X701.3  Document Code: A  Article ID: 1000-7857(2007)19-0017-06

23  Agglomeration of Dust Particle in Electrostatic Precipitator

TANG Minkang, ZHOU Yue

Abstract: The agglomeration of the charged dust particle is investigated by the method of electric-fluid mechanics and the transport theory of external force field. Several simplifying assumptions in the theoretical expression for the agglomeration rate of the dust particles are proposed. With a model of electrostatic precipitator, the agglomeration mechanism of charged particles is studied. It is shown that the agglomeration of the charged dust particles is affected by charge distribution on the surface of particles, particle size, charge polarity and charge amount of particle, and so on. No matter whether it is single polar corona or bipolar corona, the agglomeration of dust particles will take place but the agglomeration for particles with negative charges and with positive charges will be limited within a certain scope.

Key Words: dust particle; agglomeration; electric field; bipolar corona

CLC Number: TF741  Document Code: A  Article ID: 1000-7857(2007)19-0023-03

26  Principles and Application of Five Area Electrostatic Precipitating Technology

XU Guosheng, XU Libo

Abstract: In order to meet the requirement of less energy consumption and less pollutions emission, the concept of Five Area Electrostatic Precipitating (FA-ESP) Technology is proposed, the related equipment is developed, the mechanism and the optimization in industrial conditions are studied. Finally, the application of FA-ESP in a two-area ESP innovation project is described.

Key Words: five area electrostatic precipitator; rotary plate electrostatic field; flow uniform electrostatic field; re-charging electrostatic field

CLC Number: X513  Document Code: A  Article ID: 1000-7857(2007)19-0026-03

29  Study on the Main Factors Related to Integrated Design of Electrostatic Precipitator

YANG Yong, ZHANG Ruiying, SUN Xijuan, et al.

Abstract: Now a new criterion of flue gas emission is implemented in China, which is a challenge for electrostatic precipitator, and it is necessary to carry out a theoretical study on the integrated design of electrostatic precipitator. In this paper, the influence of the flue gas criterion, and the compositions of coal and ash on the dust removal efficiency and the integrated design of the precipitator are discussed. It should be provided some guidance for design and operation of ESP.

Key Words: electrostatic precipitator; integrated design; dust removal efficiency

CLC Number: X964  Document Code: A  Article ID: 1000-7857(2007)19-0029-07

36  Effects of Space Environment and Simulated Microgravity Environment on Tissue Cultural Plantlets

PAN Yi, XUE Huai, LU Jinying, et al.

Abstract: Microgravity is one of the important features of outer space. However, other factors such as cosmic rays in the cosmic space do not feature in a microgravity environment. In this paper, alterations in sub-microstructure, changes in the isoenzymes and the associated RAPD markers of the in vitro cultured higher plants are studied in both cosmic space and the simulated microgravity environments, and preliminary results are presented. The growth experiments with several cultured higher plant species are conducted, including rose, blackberry, potato, grape, carnation and Ginseng fruit under the simulated microgravity environment and genuine outer space conditions. The results show that sub-microstructural changes in cultured cells can be resulted from both microgravity and outer space growth conditions, while different effects on the cultured cells are also observed.

Key Words: space environment; stimulated microgravity; cellular ultrastructure; isoenzyme; RAPD molecular marker

CLC Number: Q69  Document Code: A  Article ID: 1000-7857(2007)19-0036-07

43  Mutation of Chromosome Number in Microspores of Descendent Plants from Impatiens balsamina Mutant Plant Yuan 3 Induced by Spaceflight

TANG Zesheng, GAO Liang, YANG Jun, et al.

Abstract: In the seeds of Impatiens balsamina after spaceflight, a mutant plant with abnormal meiotic behavior was discovered and mutations of its descendent plants were investigated. It was found that microspores in two mutant lines with different pink or red flowers had normal chromosome number of 7, while, the average number of chromosome in microspores from the mutant line with purple flower was over 10. The results about the size of their pollens show similar trends.

Key Words: Impatiens balsamina; space flight; mutant line; microspore; chromosome numbers

CLC Number: P145.8  Document Code: A  Article ID: 1000-7857(2007)19-0043-05

48  Research on Pulsed Plasma Source and Its Application in the Marine Seismic Prospecting

PEI Yanliang, LIU Baohua, ZHAO Yuexia, et al.

Abstract: This paper discusses a 500 J pulsed plasma source used as a seismic source for marine engineering applications. The seismic source consists mainly of three parts, i.e. a 500 J pulsed power source, a 50 m long high-voltage cable and a set of 100 electrodes for generation of plasmas in water. The whole discharge periods can be divided into two parts: capacitive part and inductive part. The discharge pulse of the plasma source is clean. The duration of the pulse is less than 0.2 ms. The stratum resolution of the plasma source is 0.3 m. The load resistance of the source, which is independent of the distance of the electrodes, is much higher than the resistance of transmission lines, so the energy transfer efficiency is enhanced. In the last five years, the source has been used for an over 4 000 km marine service. An example is also provided in this paper.

Key Words: pulsed plasma source; marine seismic prospecting

CLC Number: P315.62  Document Code: A  Article ID: 1000-7857(2007)19-0048-05

53  Effects of Soil Displacement Induced by Subway Shield Tunneling Excavation on Bridge Pile Foundations

GAO Erxin, CHEN Zhiguang, LI Lu, et al.

Abstract: The shield driving method has been one of the main construction methods in the metro engineering in our country. The surface settlements and the influence of shield tunneling on surrounding environment are problems closely related with the design and construction of shield tunnel. For a special engineering project, the effects of soil displacement induced by subway shield tunneling excavation on bridge pile foundation are studied using FLAC-3D. The results are compared with the measuring results. The deformation of the pile foundation is given. In addition, procedures and control methods for shield tunneling adjacent to pile foundations are proposed.

Key Words: shield tunneling; ground surface settlement; bridge pile foundation

CLC Number: U455.43  Document Code: B  Article ID: 1000-7857(2007)19-0053-04

57  Study on the Viticultural Climatic Zoning in China （II）

LI Hua，WANG Hua，FANG Yulin, et al.

Abstract: Based on the climatic characteristics in China and the grapevine growing requirements, this paper studies the thermal index and water index for viticultural climatic zoning in China. A new zoning index system is established, with Frost-Free Days (FFD) as the first index, Dryness Index (DI) as the secondary index and mean lowest temperature below -15℃ as the tertiary index, according to the climatic characteristics in China. By applying this zoning system and using the daily climatic data of the past 30 years (from 1971 to 2000) provided by CMA through ARCGIS software, China  could be subdivided into 12 viticulture zones, which reflect well the actual viticulture regions in China.

Key Words: grapevine; climatic zoning; viticulture

CLC Number: S663.1  Document Code: A  Article ID: 1000-7857(2007)19-0057-08

65  Strategy of Conservation Tillage for Preventing Wind Erosion in Agricultural Regions

YANG Xiuchun，XU Bin

Abstract: Wind erosion is one of the main factors causing land degradation in arid, semi-arid and sub-humid regions in northern China. Because of wind erosion's severe influence on the agricultural sustainable development, conservation tillage is a measure imperative under the situation. Conservation tillage may be affected by nature, social economy and disaster and so on in dry farming regions. Based on the expert experiences, a hierarchy decision-making model of conservation tillage for preventing wind erosion is established in this paper using the Analytic Hierarchy Process. The results indicate that population pressure, farmer factor, government factor and technology factor are the four factors influencing conservation tillage, with descending weight values, respectively. Therefore, in implementing conservation tillage, one should adopt a corresponding strategy for dry farming regions.

Key Words: dry farming region; wind erosion; conservation tillage technology; hierarchy decision-making model

CLC Number: P931.3  Document Code: A  Article ID: 1000-7857(2007)19-0065-05

Reviews

70  Development of Laser Plasma Micro-propulsion

ZHANG Yi, ZHENG Zhiyuan, LU Xin, et al.

75  Prospect and Key Technologies of Applying Virtual Reality in Tourism Publications

LUO Yuetong, LIU Xiaoping

81  Notes on Reviews in Chinese Science Abstracts(Chinese Edition) 

Science Reports

82  Education Innovation and the Training of Innovative Talents

Commentary

85  The Prospects of the Effects of Technology Application on Economy and Society: A Mobile Finance Service Perspective

LIU Ya, WU Yishan

86  Global Warming: The Inconvenient Truth

LIN Zhiguang

87  Books Appraisal

Editor-in-chief's Thoughts

89  How to Pound the Foundation of Postgraduates Successful Research Career (XI)

FENG Changgen

Special Columns

6  Cover Story

9  Voice of Scientific Communit

10  Half-month News Briefs

12  International Journal Highlights

13  Domestic Journal Highlights

14  Scientific Community Briefs

16  Guidance for Contributors to Science and Technology Review

84  Events

88  Readers'Letters

90  Entertainment

92  Digest of Chinese Newspapers and Journals

93  Career

95  Global Jobs