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   Science & Technology Review
2007, Vol.25, No. 0715
10 August 2007

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卷首语

Science & Technology Review. 2007, 25 (0715): 1-1. ;  doi:
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Abstract ( 395 )
封面图片说明

Science & Technology Review. 2007, 25 (0715): 6-6. ;  doi:
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Abstract ( 406 )
半月科技风云

Science & Technology Review. 2007, 25 (0715): 7-7. ;  doi:
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Abstract ( 414 )
特别栏目

Science & Technology Review. 2007, 25 (0715): 8-9. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 10-11. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 12-13. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 14-14. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 86-86. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 87-87. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 88-88. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 90-90. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 91-92. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 93-93. ;  doi:
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Science & Technology Review. 2007, 25 (0715): 94-96. ;  doi:
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Abstract ( 376 )
Exclusive

Science & Technology Review. 2007, 25 (0715): 15-15. ;  doi:
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Abstract ( 388 )
Articles

Relationship Between Frost Indexes and Viticulture Zoning in China in Recent 45 Years

Science & Technology Review. 2007, 25 (0715): 16-22. ;  doi:
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Abstract ( 571 )
Based on the analysis of nationwide climatic data in recent 45 years, the software ArcGIS is used to map the variation of Frost Free Period (FFP), Last Frost Day (LFD), First Frost Day (FFD) and minimum temperature. Their effects on viticulture zoning in China are studied. Based on the trend of FFP variation rate, the distribution of FFP in 50 years is predicted. It is found that in recent 45 years, especially after the 80s of the last century, the duration of FFP is increased, LFD is advanced, FFD is delayed, and the bury line of -15℃ is moved northward, the variation of LFD is more significant than FFD; the variation of frost indexes is influenced by the step-terrain of China, the area affected by frost indexes change is wide in a same step, but in the areas with a higher step, the variation of those frost indexes is more significant. The prediction of the future shows that the whole territory of north China is suitable for grapevine growing, except some small areas.

Influence of Light Polarization on Two-beam Coupling in Nematic Liquid Crystals

Science & Technology Review. 2007, 25 (0715): 23-26. ;  doi:
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Abstract ( 528 )
An experimental investigation on diffraction of two different polarized incident lights in C60-doped Nematic Liquid Crystal (NLC) homeotropically aligned is reported. The experiment shows that much greater energy transfer is created in grating recorded by horizontal polarization (P-P polarization) beams than that by vertical polarization (S-S polarization) ones, and the energy transfer direction is totally opposite. It is shown that when one incident beam polarization state is changed, the intensity of diffraction and transmitted beam will be changed accordingly after the grating is written. The polarization state is a very important parameter in the determination of nonlinear reorientation NLC. Nonlinear phenomena caused by molecular reorientation and their dependence on light polarization should be very useful in potential applications for optoelectronic functional elements.

Design and Application of the Ω Type Junction Workpiece Without Slot

Science & Technology Review. 2007, 25 (0715): 27-30. ;  doi:
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Abstract ( 515 )
In view of the drawbacks of the existing highway bridge expansion joint, this paper proposes a kind of the Ω type spandrel elastic junction workpiece, with novel design and good performance. The structure and working principle of the joint are presented. The force, stress and deformation are analyzed under the circumstances with temperature variations. The calculation method of the junction workpiece without slot and its extended application are discussed.

Development of FCC Diesel Hydro-dearomatization Catalyst ARO-1

Science & Technology Review. 2007, 25 (0715): 31-34. ;  doi:
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Abstract ( 637 )
ARO-1 catalyst is a hydro-dearomatization catalyst newly developed by Daqing Chemical Research Center. Its evaluation was conducted on a 15 mL hydrogenation test unit with Daqing FCC diesel being used as feedstock. The evaluation results show that ARO-1 catalyst enjoys excellent HDA, HDS, HDN performance: desulfurization rate of 97.8%, denitrogenation ratio of 99.8%, density reduction of 0.041 6 g/cm3, diesel yield of 98.0 wt%, therefore, ARO-1 is a good FCC diesel hydro-dearomatization catalyst.

Risk Analysis on Direct Property Damage for Major Fire Incidents in Towns Based on Association Rules

Science & Technology Review. 2007, 25 (0715): 35-39. ;  doi:
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Abstract ( 500 )
Risk analysis on direct property damage for 1 356 major fire incidents in towns from 2000 to 2005 is carried out based on association rules analysis with respect to time, place and cause by SPSS Clementine 8.1 software. The results show that a fire may easily turn into a major fire incident with direct property damage, in cases of electric fire in workshop, storeroom fire in November, shop fire from 2:00 to 3:00, electric fire from 23:00 to 24:00, electric fire and fire from 18:00 to 19:00 in July, workshop fire due to electric failure in July and shop fire due to electric failure from 21:00 to 22:00. These results may serve as a guidance for taking more effective fire protection measures and improving the efficiency of combat readiness for fire fighting.

Studies on Synthesis of 1,2-(methylenedioxy)benzene

Science & Technology Review. 2007, 25 (0715): 40-43. ;  doi:
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Abstract ( 534 )
1,2-(methylenedioxy)benzene is synthesized by using catechol, dichloromethane and dimethylsulfoxide with the condition of alkali and normal pressure. Overall yield of the process is 73.4%. Influence of material ratio, concentration, temperature and dosage of catalyst on the reaction is investigated and the optimum condition is obtained. Product is analyzed by infrared spectrum and gas chromatogram. Results show that the product is 1,2-(methylenedioxy)benzene and the content by gravity is 98.6%.

Design of Speech Compression System Based on AMBE-2000 of the Short-wave Communication

Science & Technology Review. 2007, 25 (0715): 44-47. ;  doi:
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Abstract ( 509 )
The quality of communication can be improved by using the technology of digital signal processing for a system of short-wave communication. This paper proposes a design of speech compression system based on AMBE-2000, including hardware and software, and the interface between different parts of the system. At the end, based on the result of test, the key technologies in developing AMBE-2000 are summarized.

Framework Study on Safety of Logistics System

Science & Technology Review. 2007, 25 (0715): 48-52. ;  doi:
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Abstract ( 477 )
The frequency of accidents is high in China's logistics industry and huge damages to the society and economy are involved. The government and enterprises' safety measures to protect the logistics system are often inadequate due to lack of a good understanding of logistics safety. Thus it is necessary to have a framework of logistics safety system including several important aspects. This paper proposes a framework for four logistics functions including storage, transportation, information and transaction, in three levels: technology, processing and personal management, as a basis for an effective logistics safety system. Three modules with respect to preventions, maintenances and emergencies are summarized. Some measures for logistics safety are suggested based on the theory of securities chain.

A New Algorithm for Solving Plane Travelling Salesman Problem: Travelling-around-the-center Method

Science & Technology Review. 2007, 25 (0715): 53-57. ;  doi:
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Abstract ( 435 )
A new algorithm, called the travelling-around-the-center method, is proposed in this paper. It is a deterministic algorithm, with its time complexity the same as the nearest neighbor algorithm, that is, O(n2), where n is the number of cities. Numerical tests for plane travelling salesman problems with various sizes are carried out by using the travelling-around-the-center method and the nearest neighbor algorithm, and the performances of both algorithms are compared. The following conclusions are drawn: (1) The relative performances of the solutions of the travelling-around-the-center method and the nearest neighbor algorithm depend on the number and distribution of the cities in a specific travelling salesman problem. (2) For n=4, the travelling-around-the-center method can always obtain the best solution, while the nearest neighbor algorithm often cannot do so. (3) For a small size problem with n<20, the travelling-around-the-center method can generally obtain better solutions than the nearest neighbor algorithm. (4) For a middle size problem with 20≤n≤30, the quality of the solution obtained by the travelling-around-the-center method is similar to that obtained by the nearest neighbor algorithm. (5) For a large size problem with n>30, the quality of the solution obtained by the travelling-around-the-center method is generally not as good as that obtained by the nearest neighbor algorithm.

Application of Neural Network Based on Fuzzy Clustering in the Classification Algorithm of Data Mining

Science & Technology Review. 2007, 25 (0715): 58-61. ;  doi:
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Abstract ( 513 )
The common classification algorithms, such as Decision Tree, Bayesian classification and Artificial Neural Network, provide an important foundation for the classification algorithm of data mining. But due to huge amounts of data, these algorithms face some challenges in time efficiency, robustness and accuracy. This paper proposes an artificial neural network model based on fuzzy clustering. First, it clusters the training data into different sub-data using the Fuzzy Clustering Model. Subsequently, it uses various artificial neural networks to train the sub-data. After that, the number and complexity of training data is reduced and the efficiency of the artificial neural network is enhanced greatly. In the end, the UCI's databases are used to prove the usefulness of the new classification algorithm. The results show the validity of application of the Neural Network based on fuzzy clustering in the classification of data mining.

Comparison Between Chinese and American Non-governmental Science and Technology Awards

Science & Technology Review. 2007, 25 (0715): 62-66. ;  doi:
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Abstract ( 1306 )
The history and the present state of Chinese and American non-governmental science and technology awards are systematically studied in this paper. Through comparison and analysis, the authors find that there are similarities in four aspects and differences in five aspects in them. Some suggestions are made on promoting Chinese non-governmental science and technology awards.
Reviews

Nano Cryosurgical Therapy: New Frontier in Nano Medicine

Science & Technology Review. 2007, 25 (0715): 67-74. ;  doi:
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Abstract ( 543 )
In recent years, cryogenic approaches for a targeted treatment on malignant tumor become more and more important in both clinics and biomedical engineering area. To breakthrough the bottleneck of the traditional cryosurgery, this study combines the nano technology and the cryogenic technology and proposes for the first time to develop a highly advanced therapy for a minimally invasive treatment of tumor. Progresses have been made on its mechanism, experimental demonstrations as well as development of medical equipment. Various evidences indicate that, the nano cryosurgical therapy is a new frontier worth of particular attention in the nano medicine field. Since this new technical strategy has unique merits over the traditional cryosurgery in regulating the growth direction and strength of ice ball, enabling a conformable tumor treatment, and enhancing image resolution etc., it is expected that one may achieve much better treatment efficiency than an ordinary cryosurgery. The nano cryosurgery opens new possibilities for developing highly targeted physical therapies on tumor. In this paper, following a brief review on the advance of cryosurgery, the concept of nano cryosurgery and its generalized significance in future nano medicine are illustrated. The basic feature, capability, and implementation of the nano cryosurgery are discussed. With the progresses in our laboratory as examples, strategies to develop future nano cryosurgery are proposed. Future prospect of this new therapy is presented. Some fundamental and practical issues are identified.

Research and Product Development of Cordyceps militaris and Its Bioactive Substances

Science & Technology Review. 2007, 25 (0715): 75-79. ;  doi:
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Abstract ( 500 )
Cordyceps militaris has been demonstrated to be the best substitute for C. sinensis, one of the top famous rare and endangered species of Chinese traditional medicines with a market price of higher than gold, as both of them have similar chemical components and medical functions. C. militaris has attracted more and more researchers and enterprenuers. This article summarizes research and product development on C. militris and its bioactive substances.

Science & Technology Review. 2007, 25 (0715): 80-80. ;  doi:
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Abstract ( 388 )
科技评论

Science & Technology Review. 2007, 25 (0715): 81-81. ;  doi:
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Abstract ( 412 )
科技报道

Science & Technology Review. 2007, 25 (0715): 82-83. ;  doi:
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Abstract ( 412 )

Science & Technology Review. 2007, 25 (0715): 84-84. ;  doi:
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Abstract ( 378 )
科技工作者建议

Science & Technology Review. 2007, 25 (0715): 85-85. ;  doi:
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Abstract ( 340 )
主编心语

Science & Technology Review. 2007, 25 (0715): 89-89. ;  doi:
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Abstract ( 383 )

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