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   Science & Technology Review
2007, Vol.25, No. 0705
10 March 2007

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Science & Technology Review. 2007, 25 (0705): 1-1. ;  doi:
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Abstract ( 276 )
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The Top 10 News Stories of 2006 in Basic Research in China Announced

Science & Technology Review. 2007, 25 (0705): 5-10.
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Abstract ( 1294 )
The Top 10 News Stories of 2006 in Basic Research in China, sponsored by Basic Research Management Center of Ministry of Science and Technology, and Association Sciences Department of China Association For Science and Technology, are announced in Beijing on February 15, 2007. Ten representatives of basic research results with great originality and newsworthy are selected.
Articles

Investigations on the Coupling of HTGR with Supercritical Steam Cycle

Science & Technology Review. 2007, 25 (0705): 11-16. ;  doi:
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Abstract ( 477 )
With its inherent safety and high temperature capability, the modular high temperature gas-cooled reactor (HTGR) has been taken as one of the six candidates for Generation IV innovative reactors. The HTGR supercritical (SC) steam cycle plant coupling the existing technologies of the current HTGR design with operational experiences of the SC fossil power plant (FPP) will achieve high cycle efficiency, 45% and above,which is 30% higher than that of the existing PWR plants (with net efficiency of 33%). The modular HTGR technologies are well mastered in China and the SC FPP technologies are also adopted in China through licensed production and cooperation. All required techniques are available to build the HTGR SC steam cycle plant, which will be the first innovative nuclear system in operation in the world

Review on Source Inversion Technology in Analyzing Nuclear Accidents

Science & Technology Review. 2007, 25 (0705): 16-20. ;  doi:
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Abstract ( 498 )
In case of a nuclear accident, the knowledge of source characteristics is closely related to the accuracy in assessing the radiation consequences and the choice of emergency measures. In this paper, the inversion methods applied to obtain the source characteristics are introduced, especially the Kalman filter method, together with related achievements and applications. In the end, the possible direction of studies on source inversion methodology in a near future is discussed.

A Study on Xinjiang Bazhou Solar Energy Resources

Science & Technology Review. 2007, 25 (0705): 21-24. ;  doi:
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Abstract ( 466 )
The solar energy resources of Ba Yin Guo Leng Mongolia Autonomous prefecture in Xinjiang Uygur Autonomous Region are analysed in this paper. Comparing the conventional energy and solar energy , it is shown that Bazhou is abudant in the solar energy resources, which is much richer than the fossil energy.

The Energy Input-output Model of Nine Pieces and the Demand Prediction of Jiangsu Province

Science & Technology Review. 2007, 25 (0705): 25-29. ;  doi:
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Abstract ( 581 )
The table of nine pieces for energy input-output is used in this paper and the whole energy-economy system is divided into energy and non-energy sections. Then energy input-output table of the base year is first obtained and the coefficient is calculated continuously by using the method of RAS sequentially. The energy input-output table of the prediction year can then be obtained. Putting the data of energy, population and economy into the table, the future total and the respective amount of the primary energy are predicted. This paper takes Jiangsu province as an example and predicts its energy demand amount in the year of 2010, 2015 and 2020. The result indicates that there is a positive correlativity between energy consumption and economy development; the coal still predominates in the energy consumption structure, but with a large declining margin; the gap between energy supply and demand becomes increasingly large and the self-reliance level declines continuously; the energy efficiency sees a significant increase.

Effects of Freezing Temperature, Time and in vivo Feeding of Glucose to the Revival Ratio of Ants Subject to Cryopreservation Around -15℃

Science & Technology Review. 2007, 25 (0705): 34-37. ;  doi:
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Abstract ( 464 )
Tests on the freezing revival of a micro biological body may provide experimental evidences to support future scientific efforts in freezing and surviving an animal or even a human being. In this study, revival experiments of ants subject to cooling around -15℃ were performed. Correlations between the ant revival ratio and the freezing rate, the time and temperature levels were investigated. Particularly, the influence of in vivo feeding with glucose on the ant revival ratio was also tested. It is found that the revival ratio of the ants under freezing around -15℃ is directly proportional to the freezing rate, at least, a rapid freezing will not lower the revival ratio. The longer freezing time and the lower freezing temperature, the lower revival ratio will be. If feeding with glucose, the capability for the ant to withstand the freezing injury may be improved.

Effectiveness of Pursplane in Improving Blood Glucose

Science & Technology Review. 2007, 25 (0705): 38-41. ;  doi:
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Abstract ( 437 )
It is found by experiments that the effectiveness of purslane in reducing the blood glucose and improving the syndrome of diabetic mice comes from its functions in preventing the damage of pancreatic islets cell and immune organs, repairing the injured pancreatic islets cell, and lowering down the blood fat, and so on.

Study on ITS Sequence Fingerprint of Ultramicro Fructus Evodiae

Science & Technology Review. 2007, 25 (0705): 42-46. ;  doi:
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Abstract ( 454 )
To study the identification and evaluation methods of Ultramicro Fructus Evodiae, samples of Ultramicro Fructus Evodiae were taken, respectively, from fifteen kinds of Evodia Rutaecarpa (Juss.) Benth., and its varietas, their total DNAs were extracted and cloned, and the ITS sequencee were determined by molecular biological techniques. The ITS1, 5.8S and ITS2 sequences of ultramicro Fructus evodiae from three plant species were obtained. The inner similitude of same species was above 98%, but the diversity among these sequences was about 27%. Analysis of ITS sequence fingerprint can provide an effective criterion for the identification of Ultramicro prepared herbs.

Chang'E-1 Lunar Orbiter: China's First Step into Deep Space Exploration

Science & Technology Review. 2007, 25 (0705): 47-52. ;  doi:
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Abstract ( 1088 )
The successful launch of Clementine lunar orbiter in 1994 and Lunar Prospector orbiter in 1998 has seen many new scientific findings. During the first few years of the 21 century, many countries annouced their new space policies and plans. The future space exploration will focus on the Moon and the Mars, and from the Moon to the Mars. Moreover, the Moon exploration, manned or unmanned, has been planed for the next 30 years. The implementation of Chinese lunar orbiter program, Chang'E-1, will fill in the blank page of deep space exploration in Chinese aerospace industry. Chinese lunar orbiter program was first proposed in1994 and formally started in 2004, after 10 years' delibration from various aspects, such as political, scientific and technological, and economical considerations. Chang'E-1 Lunar Orbiter will be launched by a Long March 3A launch vehicle in 2007. The orbiter is scheduled to be finally placed into a polar orbit of 200 km around the Moon, where it will carry out its tasks. The payloads include CCD Cameras and Imaging Spectrometer (31kg, 50 watts), Laser Altimeter (11 kg, 25 watts), Gamma and X-Ray Spectrometer (35 kg, 15 watts), Microwave Radiometer (30 kg, 42 watts), High Energy Particle Detector (2.4 kg, 3 watts), and Low Energy Ion Detectors (7 kg, 7 watts). Scientific objectives of Chang'E-1 Lunar Orbiter include providing stereo imaging of the lunar surface, detecting 14 elements and petrology and mineralogy of the lunar regolith, studying the thickness of lunar regolith, and detecting the earth-moon environment.

The Master Design of a Test System for Aperture Performance

Science & Technology Review. 2007, 25 (0705): 53-55. ;  doi:
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Abstract ( 452 )
The test system should be able to set the light intensity to a fixed value, to tune the light intensity continously, to simulate the object image's high illumination and to obtain the object's images with high frequency. The functions, the hardware structure and the software structure of the test system for aperture performance are presented in this paper, and the designs of electric controller and optics coupling system are discussed in detail. The device has already been checked and accepted by its clients. It is shown that all performance specifications can meet clients' need,in a stable and reliable way and good results are obtained.

Stimulation of Brassinolide on Advititious Root Formation in Mung Bean

Science & Technology Review. 2007, 25 (0705): 56-60. ;  doi:
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Abstract ( 430 )
The pre-treatment of germinating seeds of mung bean with 10-2 mol/L of brassinolide(BR) is found to help the advititious root formation and root growth in hypocotyl cuttings of mung bean. Root length, root numbers and rooting areas per cutting were increased by 12.5%, 27.4%, 37.6%, respectively, over the controls after two days of treatment. Enzyme activities of indole pyruvate decarboxylase, indole acetaldehyde oxidase and tryptophan aminotransferase were increased by 120.6%, 82.1% and 54.7%, respectively, and indole acetic acid (IAA) content was increased by 22.3% in the rooting zone of the cuttings. Cell numbers in S phase in the basal part of rooting zone was increased by 23% in the BR treatment. Results indicate that BR helps the rooting by increasing IAA contents.

Study on the Volumetric Method using a Multi-component Dynamic Gas Confection System

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Science & Technology Review. 2007, 25 (0705): 60-62. ;  doi:
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Abstract ( 438 )
MF-5 multi-component dynamic gas confection system is an equipment that can confect gas with a precise flux control. In this paper, it is used to dynamically confect gas by controlling the flux of gas components. Its volumetric precision is studied under given temperature and pressure. The result of experiment shows that this device is stable and enjoys good precision, and the measuring values agree with the calculated ones.

Critical Breakage Condition for Dispersed Droplets of W/O Emulsion

Science & Technology Review. 2007, 25 (0705): 63-65. ;  doi:
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Abstract ( 467 )
The mechanism and critical breakage condition of dispersed droplets in Newtonian liquid-liquid emulsion was analysed. A lamina shear flow was obtained by Couette double-cylinder device. Based on the deformation and breakage of the water-in-oil emulsion at different shearing rates, the critical breakage condition was validated and updated. With respect to the water-oil hydrocyclone, the separate effect can be forecast by the flow distribution and the physical properties of the emulsion. According to the separate capability of the hydrocyclone, the operaing condition such as rotating speed and flux can be appropriately controlled to maintain a reasonable distribution of the internal flow field, therefore, to prevent a further emulsification. The study of the critical breakage condition can provide a reliable basis to determine the proper shear distribution in various emulsion separating devices.

Diagnostic Analysis of the Extratropical Transition Process of the Landfall Typhoon Matsa(0509)

Science & Technology Review. 2007, 25 (0705): 66-71. ;  doi:
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Abstract ( 1244 )
A study was carried out on the landfall typhoon 0509 Matsa,which sustained over land for a long period and was transformed into an extratropical cyclone in the end. Through the analysis, it is shown that the Matsa's extratropical transition and the re-intensification are due to the intrusion of cold air from the upper-level trough into the typhoon's circulation. From the variation of potential vortices at the upper-level, one can clearly see the mechanism that its anomaly is downward transported from the upper troposphere during the typhoon's transformation. The main course is the transformation of a symmetric perpendicular cyclone to a baroclinic asymmetric cyclone.

Development of Nano-TiO2 Modification in Visible Light

Science & Technology Review. 2007, 25 (0705): 72-78. ;  doi:
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Abstract ( 426 )
Nano-TiO2 has attracted much attention due to its good photocatalysis properties, but its low efficiency in the response to visible light prevents its wide use. To solve this problem, many modification methods have been developed, such as metal ion doping, nonmetal ion replacement, two(or more) semiconductor composite and organic dye sensation, which are reviewed in this paper. Some comments are made with respect to studies on visible light modification.

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