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   Science & Technology Review
2011, Vol.29, No. 21
28 July 2011

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卷首语

Science & Technology Review. 2011, 29 (21): 3-3. ;  doi:
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科技风云

Science & Technology Review. 2011, 29 (21): 7-7. ;  doi:
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Science & Technology Review. 2011, 29 (21): 8-8. ;  doi:
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特别栏目

Science & Technology Review. 2011, 29 (21): 8-8. ;  doi:
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Science & Technology Review. 2011, 29 (21): 10-10. ;  doi:
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Science & Technology Review. 2011, 29 (21): 12-12. ;  doi:
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Science & Technology Review. 2011, 29 (21): 13-13. ;  doi:
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Science & Technology Review. 2011, 29 (21): 14-14. ;  doi:
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Science & Technology Review. 2011, 29 (21): 83-83. ;  doi:
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Science & Technology Review. 2011, 29 (21): 84-84. ;  doi:
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Science & Technology Review. 2011, 29 (21): 85-85. ;  doi:
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Science & Technology Review. 2011, 29 (21): 94-94. ;  doi:
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科技事件

Science & Technology Review. 2011, 29 (21): 9-9. ;  doi:
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科技工作大家谈

Science & Technology Review. 2011, 29 (21): 11-11. ;  doi:
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Exclusive

Science & Technology Review. 2011, 29 (21): 15-16. ;  doi:
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Abstract ( 1091 )
Articles

Stress Corrosion Cracking of 304L Stainless Steel in a Simulated PWR Environment

GUAN Yuxin;DONG Chaofang;LI Yan;CHENG Xuequn;LIU Feihua;LI Xiaogang;REN Ai
Science & Technology Review. 2011, 29 (21): 17-21. ;  doi: 10.3981/j.issn.1000-7857.2011.21.001
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Abstract ( 393 )
In a simulated primary circuit of PWR environment, the effect of temperature on Stress Corrosion Cracking (SCC) of 304L stainless steel in high-temperature and high-pressure water was investigated using Slow Strain Rate Tests (SSRT). And the fracture morphology of specimens was analyzed with the aid of Scanning Electron Microscopy (SEM). The results show that 304L stainless steel tends towards a brittle fracture as temperature increasing. Certain parameters, such as tensile strength, almost remain unchanged, while both elongation and section shrinkage slightly decrease. During the test, no obvious cleavage character is found on the fracture surfaces of 304L stainless steel specimens. With temperature increasing from 200℃ to 345℃, no sensitive temperature is found for 304L stainless steel and the susceptibility to SCC is low.

Key Techniques and Implementation of Multiple Classifier System for Remote Sensing Images

XIA Junshi;DU Peijun;ZHANG Wei
Science & Technology Review. 2011, 29 (21): 22-26. ;  doi: 10.3981/j.issn.1000-7857.2011.21.002
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Abstract ( 385 )
In order to overcome the limitation of the accuracy and efficiency of a single classifier, Remote Sensing Multiple Classifier System (RSMCS) is proposed. The system is able to combine the advantages of diffident classifiers and in the meantime acquires higher accuracy than that for a single classifier. According to the characteristics of remote sensing images and the acquirement of classifications, based on the requirement analysis and design for the system, the system is developed by using IDL language on the ENVI remote sensing information processing platform. The major functions of the system include remote sensing image file processing module, image feature selection and extraction module, remote sensing image classification pre-processing module, and remote sensing multiple classifier ensemble module (fixation combination style, user-defined style, wizard style, and recommend style). Furthermore, two experiments are presented to illustrate that the system could effectively improve the accuracy of remote sensing image classification.

Mobile Government System Based on the Android Platform

YE Xiaorong;SHAO Qing
Science & Technology Review. 2011, 29 (21): 27-30. ;  doi: 10.3981/j.issn.1000-7857.2011.21.003
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Abstract ( 358 )
With the rapid development of the 3G mobile internet technology and the widespread use of the smart cell phone system, the public could visit the government e-government system not only through the fixed internet, but also by using a mobile phone at any time. Therefore, the e-government system is mobilized and to be moved up. The mobile e-government system, which consists of server and client, is designed and developed based on the Android platform. The client of this system is able to provide information browsing and publishing services, consulting services, and online office services. The client offers immediate e-government services directly on the cell phone. And the server of this system is responsible to offer the functions of e-government system, such as receiving data, processing data, and the entire system pays more attention to the security of the design and deployment. The system would be further optimized and improved, and meets the requirements of the mobile e-government system, and provides more convenient, fast, and more efficient services to the public.

Research and Design of Topical Crawl Module Based on Deep Web Search Technology

MENG Jing;LIU Shouqiang;
Science & Technology Review. 2011, 29 (21): 31-35. ;  doi: 10.3981/j.issn.1000-7857.2011.21.004
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Abstract ( 997 )
As the web rapidly grows, massive data management and search becomes particularly important. Heterogeneous mass information and dynamic characteristics of information integration require Web crawlers to automatically access these Web pages in order to further process the data, the internal confidential information of enterprises must be only used by different internal staffs, the openness and conservative features become the major bottleneck for the enterprise development. To help out this task, some forms of the traditional resource sharing are changed, an efficient, convenient, and confidential resource sharing management platform-Enterprise Search Engine (ESE) is provided, and the design and implementation method for Deep Web ESE based on topical crawl and indexed enterprise search systems based on open source Java Lucene is proposed. After the deployment and experiment of Deep Web site in the telecommunications industry, the results are proved to meet the design target. It plays an important role in the telecommunications industry. Finally, the studies on the search accuracy and speed, anti-spam pages and fraud, etc are looked forward.

De-noising Method of Vibration Signal for Mine Gearbox Based on Adaptive Wavelet Correlation Analysis

LIU Qiang;SU Ronghua
Science & Technology Review. 2011, 29 (21): 36-40. ;  doi: 10.3981/j.issn.1000-7857.2011.21.005
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Abstract ( 369 )
A de-noising method based on Adaptive Wavelet Correlation Analysis (AWCA) is attempted to be applied to the vibration signal for mine gearbox using characteristics of strongly correlative between adjacent layers of the wavelet coefficients of real signal. The wavelet coefficients can be divided into available coefficients and noise coefficients, and adaptive threshold method based on wavelet entropy is applied, the available coefficients are reconstructed to restore the original real signal after de-noising process. The method is applied to the simulated signal and vibration signal of mine gearbox respectively and is compared with methods of wavelet hard threshold and traditional correlation de-noising in the reconstructed waveforms, SNR and standard deviation, and the measured signal power spectral chart. The results indicate that the de-noising method based on AWCA can effectively remove noise and reserve available signal and can effectively improve the reliability of mine gearbox vibration signal.

Determination of Musk Ketone Content in Cosmetics by Reversed-phase High Performance Liquid Chromatography

CHEN Zhirong;GAO Xiaoxuan;MU Min;ZHANG Pengxiang;ZHAO Hua
Science & Technology Review. 2011, 29 (21): 41-44. ;  doi: 10.3981/j.issn.1000-7857.2011.21.006
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Abstract ( 549 )
Due to the human carcinogenic effect of musk ketone it is the restriction ingredient in cosmetics, and the content analysis of musk ketone is necessary. The various matrixes of cosmetics are prepared by using ultrasonic-assisted extraction. A reversed-phase high performance liquid chromatography method for the determination of musk ketone in cosmetics is established. The samples are analyzed under the condition of Kromasil-C18 column (250mm×4.6mm i.d., 5μm) with UV 235nm. The mobile phase is a gradient elution with V(CH3CN):V(H2O) = 80:20 at a flow rate of 1.0mL/min. Results show that as the concentration of musk ketone is in the range of 0.5-150μg/mL, the relationship between concentration and the corresponding peak area presents the good linearity (r=0.9998). The regression equations could be expressed as A=13500ρ-4829; and the recovery ratio of musk ketone achieves at 90.5%-102.5%. The RSD of the method is 0.45%-0.98%. Therefore, an accurate and stabilizing method with extensive applications is proposed and built. The method provides the reference for the analysis on musk ketone and for the establishment of the state regulations.

Numerical Simulation on Hazard Zone Determination During the Dispersion of Natural Gas Containing Carbon Dioxide

MA Shihai;HUANG Ping;YANG Zhichao;CAI Xiaojun
Science & Technology Review. 2011, 29 (21): 45-50. ;  doi: 10.3981/j.issn.1000-7857.2011.21.007
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Abstract ( 1210 )
The explosion characteristics and hazards caused by dispersion of the natural gas containing carbon dioxide are concerned about. In order to confirm the hazard zone determination during the dispersion of natural gas containing carbon dioxide, explosion characteristics and the accuracy evaluation for the numerical model, mechanism of the puff dispersion and dispersion issues caused by blowout were investigated by numerical simulation methods. A dispersion model of natural gas containing carbon dioxide was set up, and the dispersion evolvement was researched in detail, furthermore, the hazard zone concluding asphyxiation and explosion or flammability is defined. The numerical simulation results show that the flammability zone caused by the puff dispersion of the natural gas containing carbon dioxide takes on an irregular cirque distribution. Along-wind variation of flammability-zone dimension is larger than that for crosswind. For both cases of along-wind and crosswind, the distribution of variations of flammability zone with time presents the shape of parabola whose peak point is up. Besides, it does not matter to judge explosive zone based on time or on space, the affected area for flammability zone is way smaller than that for the asphyxia zone.

Well Logging Evaluation of Source Rock and Its Application in Bohai Bay Oil Exploitation

TANG Lina
Science & Technology Review. 2011, 29 (21): 51-54. ;  doi: 10.3981/j.issn.1000-7857.2011.21.008
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Abstract ( 1182 )
To study total reservation and distribution of oil and gas in the sedimentary basin, the distribution of source rock should be investigated first. Based on the limited number of core samples, it is impossible to obtain the continuous laboratory measurements of organic carbon of source rock. The full information of organic carbon can not be revealed by laboratory measurements, because it is the geometric mean value of several discrete core samples. Well logging evaluation of source rock is carried out in order to get the information about continuous organic carbon content and thickness of source rock. In Shahejie Formation, source rock is identified by typical well logging characteristics of high gamma, high porosity, and high resistivity. The continuous organic carbon content of source rock is calculated by using a quantitative relationship model, which is established based on multivariate statistical analysis between well logging information and the core carbon content. Comparing with different methods for organic carbon content calculations, the Passey formula method is found to fit well with the core geochemistry method, and with a small relative error. The Passey formula method is basically confirmed that it satisfies the demand for hydrocarbon source rock evaluation in Bohai Bay oilfield. The processing results of 20 wells indicate that there is higher organic carbon content and thicker source rock in Shahejie lacustrine Formation. Especially, the middle of the third zone of Shahejie Formation is the most beneficial layer of source rock.

Effect of Atmospheric Deposition on Heavy Metal Accumulation in Tea Leaves

WANG Yang;LI Baogang;ZHANG Mingkui
Science & Technology Review. 2011, 29 (21): 55-59. ;  doi: 10.3981/j.issn.1000-7857.2011.21.009
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Abstract ( 432 )
Experiments were carried out to test the effects of atmospheric deposition on the heavy metal accumulation in tea leaves. The experiments concern three sites with different pollution sources of atmospheric deposition, including traffic pollution, industrial pollution and non-point pollution areas, and are under the conditions of open air and plastic film cover. The results show that the atmospheric deposition has a notable effect on the heavy metal accumulation in young tea leaves, but not for old tea leaves. The traffic pollution increases significantly the accumulation of Pb and Cd in young tea leaves. The industrial pollution increases significantly the accumulation of Pb, Cd, and Cr in young tea leaves, with its effect being decreased with the increase of the distance from a highway or factory. The altitude also affects the accumulation of Pb in the young tea leaves in the non-point pollution area. As compared with these, the accumulation of Pb, Cd and Cr in young tea leaves under plastic film cover conditions is decreased by 27%-46%, 21%-36% and 13%-33% for traffic pollution area, and 22%-44%, 23%-32%, and 24%-29% for industrial pollution area. The accumulation of Pb in young tea leaves under plastic film cover conditions in the non-point pollution area is 13%-19% lower than those under the open air condition. The contribution of atmospheric deposition to the accumulation of heavy metals in tea leaves is greater in industrial pollution areas than in traffic pollution areas. It is very important to control the atmospheric pollution in the tea production area and not to plant teas in the area with heavy atmospheric pollutions.

The Clinical Epidemiology Investigation of Depression in View of Syndrome Characteristics of Traditional Uighur Medicine

ABLA Ayimgul;BAYAHMET Kumush;ARSILAN Bahargul;TURSUN Turghun;YUSUP Abdiryim
Science & Technology Review. 2011, 29 (21): 60-63. ;  doi: 10.3981/j.issn.1000-7857.2011.21.010
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Abstract ( 465 )
This paper studies the epidemiology of depression in view of syndrome characteristics of traditional Uighur Medicine. Epidemiological investigation for syndrome characteristics of traditional Uighur medicine in depression patients who were stayed in the department of clinical psychology of the First Affiliated Hospital of Xinjiang Medical University was conducted, including general information, clinical symptoms, Hamilton depression rating scale (HAMD) and statistical analysis. The results show that the female patients outnumber the male patients. Patients aging between 40-52 outnumber other aging groups (27.36%). The number proportion in four abnormal Hilit groups is in the following order: Abnormal Savda group>Abnormal Sapra group>Abnormal Balgham group>Abnormal Khan group. There is no significant difference between four groups when compared to their HAMD scale (P>0.05). It is concluded that the Abnormal Savda is the main syndrome of depression in the traditional Uighur Medicine.

Mechanical Properties Improvement in Concrete of Every Age by Using Different Contents of Nano-SiO2

TANG Xiaoping;WEI Xiuying;LIU Xiaowen;WANG Xueyan
Science & Technology Review. 2011, 29 (21): 64-69. ;  doi: 10.3981/j.issn.1000-7857.2011.21.011
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Abstract ( 408 )
Based on the actual projects, tests of concrete cubic-compressive strength, tests of elastic modulus, and tests of durability involving the concrete which cement is replaced with the same amount of nano-SiO2 making concrete blocks in the age periods of 7, 28, and 56 days are respectively conducted. The data is analyzed, and the numerical relationship between incorporation of nano-SiO2 and concrete strength elevation is studied by using linear regression method. The calculation expression for the cubic-compressive strength of concrete with nano-SiO2 content and concrete periods of 7, 28, and 56 days is established. The test data of elastic modulus is statistically analyzed, and the ways for improving and increasing of elastic modulus in different concrete ages with different contents of nano-SiO2, the effects of nano-SiO2 on the change of concrete microstructure and on the increase of anti-penetration grade and chloride-penetration resistance are explored. The best mixing amount of nano-SiO2 is obtained in order to guide the production of concrete contained nano-SiO2.

Performance of Asphalt Mixture Made From Waste Tire Rubber

FAN Xinghua
Science & Technology Review. 2011, 29 (21): 70-72. ;  doi: 10.3981/j.issn.1000-7857.2011.21.012
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Abstract ( 1142 )
The accumulation of waste tires will lead to "black pollution", posing environmental problems. In order to use effectively the waste tire rubber, solve the technical problems about using the waste tire rubber as a material additive, tests were conducted on asphalt mixtures of four types (AH-70, CR7, CR10 and CR13) made from waste tire rubber, in AC-13 aggregate gradation. The physical and rheological characteristics are analyzed through the Marshall experiment, rutting test, splitting test, bending test at low temperatures for the four types of the asphalt mixture. The analyses include the effects of rubber power contents on the properties of the asphalt. Test results show that the addition of rubber power would effectively improve the performance and the temperature sensitivity. Compared to AH-70, CR7 and CR13, the rubber modified bitumen CR10 is found to have the most satisfactory pavement performance.
Reviews

The Test Methods for Assessing Spontaneous Combustion Tendency of Sulfide Ores

YANG Fuqiang;WU Chao;LI Zijun;CHEN Song;
Science & Technology Review. 2011, 29 (21): 73-79. ;  doi: 10.3981/j.issn.1000-7857.2011.21.013
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Abstract ( 1225 )
Evaluating spontaneous combustion tendency of sulfide ores before actually mining is one of the most effective measures for preventing metal mines from causing spontaneous combustion fires. The present test methods for assessing spontaneous combustion tendency of sulfide ores, including oxygen-adsorption velocity test, traditional crossing-point temperature test, adiabatic oxidation test, comprehensive test, wire-mesh basket crossing point temperature method, temperature programmed oxidation method, and TG-DSC test, are systematically discussed. The test mechanism, operation procedures, excellences and drawbacks for some test methods are set forth. Based on the characteristics of these methods, five types of them are classified, and the future development direction for the spontaneous combustion tendency test of sulfide ores is also looked into.
科技评论

Science & Technology Review. 2011, 29 (21): 80-80. ;  doi:
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Science & Technology Review. 2011, 29 (21): 82-82. ;  doi:
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主编心语

Science & Technology Review. 2011, 29 (21): 83-83. ;  doi:
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走向职场

Science & Technology Review. 2011, 29 (21): 86-86. ;  doi:
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Science & Technology Review. 2011, 29 (21): 87-89. ;  doi:
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