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   Science & Technology Review
2013, Vol.31, No. 33
28 November 2013

Articles
Reviews
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卷首语

Science & Technology Review. 2013, 31 (33): 3-3. ;  doi:
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Abstract ( 73 )
科技风云

Science & Technology Review. 2013, 31 (33): 7-7. ;  doi:
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Abstract ( 97 )
特别栏目

Science & Technology Review. 2013, 31 (33): 8-8. ;  doi:
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Science & Technology Review. 2013, 31 (33): 8-8. ;  doi:
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Science & Technology Review. 2013, 31 (33): 10-10. ;  doi:
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Science & Technology Review. 2013, 31 (33): 11-11. ;  doi:
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Science & Technology Review. 2013, 31 (33): 12-12. ;  doi:
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Abstract ( 73 )

Science & Technology Review. 2013, 31 (33): 13-13. ;  doi:
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Science & Technology Review. 2013, 31 (33): 14-14. ;  doi:
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Science & Technology Review. 2013, 31 (33): 81-81. ;  doi:
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Abstract ( 60 )

Science & Technology Review. 2013, 31 (33): 82-82. ;  doi:
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Abstract ( 94 )

Science & Technology Review. 2013, 31 (33): 82-82. ;  doi:
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Science & Technology Review. 2013, 31 (33): 86-88. ;  doi:
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Abstract ( 67 )

Science & Technology Review. 2013, 31 (33): 89-89. ;  doi:
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Abstract ( 54 )

Science & Technology Review. 2013, 31 (33): 90-92. ;  doi:
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Abstract ( 62 )

Science & Technology Review. 2013, 31 (33): 94-94. ;  doi:
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Abstract ( 63 )

Science & Technology Review. 2013, 31 (33): 95-95. ;  doi:
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Abstract ( 60 )

Science & Technology Review. 2013, 31 (33): 96-96. ;  doi:
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Abstract ( 53 )
科技事件

Science & Technology Review. 2013, 31 (33): 9-9. ;  doi:
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Abstract ( 80 )
Articles

Speaker Recognition Method Based on Quantum Logic Cir-cuit Neural Networks

PAN Ping;LUO Hui;WANG Yang
Science & Technology Review. 2013, 31 (33): 15-18. ;  doi: 10.3981/j.issn.1000-7857.2013.33.001
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Abstract ( 234 )
Under the same spatial and temporal conditions, the quantum computing is superior to the traditional computing. Because a speaker's speech signal features the time-varying property and the randomness, its characteristic parameters also show high-dimensional characters and large changes in adjacent frames. This paper, based on the quantum information processing theory, takes a frame of the speech signal as a quantum state, and uses quantum logic gate circuits to construct the neural network according to the traditional neural network, and obtains an efficient clustering of the speaker's speech signal. A speaker recognition model is built and a method based on the quantum logic circuit neural network is proposed. This model has a large number of global attractors, and the method can use them to effectively reduce the complexity of the speech signal processing. Through simulations on a classical computer and a comparison with the BP neural network speaker recognition model, it is shown that this method not only can accelerate the convergence rate of the model but also has a better robustness with respect to the parameter changes. The system's recognition rate with the method proposed in this paper is 3.34% in average higher than that with the BP neural network method.

River Functions

ZHAO Yinjun;DING Aizhong;LI Yuanyuan
Science & Technology Review. 2013, 31 (33): 19-24. ;  doi: 10.3981/j.issn.1000-7857.2013.33.002
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Abstract ( 154 )
In order to deeply understand river functions, the essence of river function is discussed from the system theory for its sustainable utilization and it is expected to promote theoretical development of river function. The results show that, river function is the ability and effectiveness in the interactional process between river system and environment, it is determined by the structure of river system, achieved through the material flow, energy flow and information flow in the river system, and expressed through meeting demands for river own and external environment. River functional harmony was built by using principles that includes the local interest obedience overall benefit and the lower level needs priority.

Geochemistry of Tamulangou Formation Volcanic Rocks in Mohe, North Da Hinggan Mountains

ZHANG Yutao
Science & Technology Review. 2013, 31 (33): 25-30. ;  doi: 10.3981/j.issn.1000-7857.2013.33.003
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Abstract ( 211 )
There are large areas of late Mesozoic volcanic rocks in Mohe, north Da Hinggan Mountains. Among these volcanic rocks, the Tamulangou Formation erupted earlier than other formations. The Tamulangou Formation is a set of basic to intermediate volcanic rocks, including lavas and pyroclastic rocks. The study of petrogenesis of the Tamulangou Formation may provide a very important insight for the tectonic evolution of north Da Hinggan Mountains. A systematic geochemical analysis of major and trace elements was carried out with samples from the Tamulangou Formation. It is shown that most samples are alkaline basic to intermediate rocks with SiO2 contents of 52.7%-57.8%. These rocks are basaltic trachy andesites and trachy andesites. Compatible transitional elements such as Cr, Co and Ni are low in contents. Trace element ratios such as Nb/La, Ba/Nb, Nb/U and Ce/Pb and the total rare earth elements contents of these samples vary in a large range, with a right-oblique rare earth element distribution mode. The petrogenesis study indicates that the partial melting of the enriched continental lithospheric mantle plus a slight crustal contamination and a certain degree of fractional crystallization are responsible for the formation of the Tamulangou Formation volcanic rocks.

Numerical Simulation of Fluid-Structure Interaction Stability for Jinchuan Deep Roadway

ZHANG Chunyang;CAO Ping;JIN Jin;PU Chengzhi;MENG Jingjing
Science & Technology Review. 2013, 31 (33): 31-36. ;  doi: 10.3981/j.issn.1000-7857.2013.33.004
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Abstract ( 407 )
Groundwater flow would affect the mechanical properties of surrounding rock. In this paper, based on the fluid-solid coupling basic principles, and taking the Jinchuan second mining area deep roadway as an example, a 1000m level roadway fluid-solid coupling computational model is established, then the surrounding rock stress field, the deformation, and the excavation unloading under the seepage condition are simulated. It is shown that the effect of the vertical component of the roadway stress is greater than those of the horizontal components under the seepage condition, the maximum and the minimum principal stresses are larger than those under the anhydrous condition. The rock deformation spatial distributions are similar under the two conditions, the impact of the seepage on the vertical displacement is larger than that on the horizontal displacement. For example, the roadway arch vertical displacement is significantly greater than that under the anhydrous condition, the arch maximum displacement is approximately 8.2mm under the seepage condition, while that under the anhydrous condition is only about 2.3mm, therefore, the seepage effect will lead to the deterioration of the roadway roof stability. The excavation unloading effect on the seepage field is evident that the roadway surrounding pressure head decreases rapidly after the excavation, the minimum pore water pressure drops to zero, and the pore water pressure changes from a horizontally layered distribution to a zonal distribution along the roadway profile.

Application of Quasi-impedance Inversion in the Microfacies Mapping in Pubei Oil Field

CAO Tong;GUO Shaobin
Science & Technology Review. 2013, 31 (33): 37-41. ;  doi: 10.3981/j.issn.1000-7857.2013.33.005
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Abstract ( 376 )
In order to meet the need of further reservoir development it is essential to improve the cartographic accuracy of the microfacies map for clastic rock reservoirs, especially to enhance its prediction capability in the cross well area. In the second fault block of the Pubei oil field in Daqing placanticline, the reservoirs and the surrounding rocks of the Putaohua Formation can not be differentiated only according to the acoustic attributes; therefore, a cartographic method which combines the single well facies with the quasi-impedance results is proposed. Firstly, from all the logging attributes, the optimum logging attribute which can differentiate the reservoirs and the surrounding rocks is chosen. A spontaneous potential attribute is chosen in the Putaohua Formation. Secondly, the seismic inversion is processed by using the quasi-impedance logging curve and adding the information of the spontaneous potential curve. Thirdly, the cross well microfacied types can be predicted by the inverted sand thickness; the channel width in the map can be calculated based on the inversion information; and the whole pattern of the microfacies map can be determined on the basis of the quasi-impedance inversion slices. Finally, the microfacies map is completed after the calibration of the single well facies. The real application shows the high accuracy and the practicability of the new mapping method, for the reservoir development and adjustment.

Geological Conditions of Shale Gas in the Wufeng-Gaojiabian Formations in Lower Yangtze Area

SONG Ning;YANG Shuaishuai;HOU Pengfei;GUO Haiying;WANG Guangli
Science & Technology Review. 2013, 31 (33): 42-46. ;  doi: 10.3981/j.issn.1000-7857.2013.33.006
Full text: HTML (0 KB)  PDF  (1235 KB)  ( 233 )
Abstract ( 372 )
In order to meet the need of further reservoir development it is essential to improve the cartographic accuracy of the microfacies map for clastic rock reservoirs, especially to enhance its prediction capability in the cross well area. In the second fault block of the Pubei oil field in Daqing placanticline, the reservoirs and the surrounding rocks of the Putaohua Formation can not be differentiated only according to the acoustic attributes; therefore, a cartographic method which combines the single well facies with the quasi-impedance results is proposed. Firstly, from all the logging attributes, the optimum logging attribute which can differentiate the reservoirs and the surrounding rocks is chosen. A spontaneous potential attribute is chosen in the Putaohua Formation. Secondly, the seismic inversion is processed by using the quasi-impedance logging curve and adding the information of the spontaneous potential curve. Thirdly, the cross well microfacied types can be predicted by the inverted sand thickness; the channel width in the map can be calculated based on the inversion information; and the whole pattern of the microfacies map can be determined on the basis of the quasi-impedance inversion slices. Finally, the microfacies map is completed after the calibration of the single well facies. The real application shows the high accuracy and the practicability of the new mapping method, for the reservoir development and adjustment.

Impervious and Anti-collapse Drilling Fluid in Block D in Myanmar

PANG Xiaowang;ZHAO Xiangyang;XIAO Chao
Science & Technology Review. 2013, 31 (33): 47-51. ;  doi: 10.3981/j.issn.1000-7857.2013.33.007
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Abstract ( 208 )
During the drilling in Block D in Myanmar, the wellbore collapse, the abnormal drill torque and the bit broken falling cuttings were repeatedly encountered, the rate of penetration was reduced, and the drilling progress was seriously affected. This paper focuses on the wellbore instability problems in the process of drilling and developes a drilling fluid system suitable for this block, to improve the drilling speed, reduce the downhole complex accidents. The shale clay composition, the microstructure and the hydration performance of the collapse-prone section in Myanmar block D are analyzed. In view of the existing problems of the early used drilling fluid, the appropriate impermeable and anti-collapse drilling fluid formulation is optimized. The laboratory experiment and evaluation results show that the impermeable and anti-collapse prevention drilling fluids have a strong ability to resist pollution, a good temperature resistance, good clay shale inhibition ability and block ability. In the process of the field application in 4 wells, the drilling fluid shows a good effect on the wellbore stability and can effectively solve the problems of the borehole collapse and the hole enlargement, significantly reduce the downhole complex accidents.

Reliability Analysis of Safety System in Nuclear Power Plant Based on Bayesian Network

GU Jian;XUE Junfeng;PENG Jianping;WANG Zhiqiang;GONG Haiguang;TONG Lili
Science & Technology Review. 2013, 31 (33): 52-57. ;  doi: 10.3981/j.issn.1000-7857.2013.33.008
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Abstract ( 279 )
With respect to the improved Auxiliary Feedwater System(ASG) of Nuclear Power Plant(NPP), this paper studies the safety evaluation method based on the Bayesian Network(BN). The first step is to set up the Reliability Block Diagram(RBD) of ASG through the Failure Mode and the Effect Analysis(FMEA). Then the BN of the ASG is built in terms of the mapping relation between RBD and BN. Based on the network reasoning, the event occurrence probability is calculated and the system reliability is analyzed. It is indicated that through the forward reasoning, the backward reasoning and the bidirectional reasoning, the occurrence probability of an arbitrary node can be calculated and more information about the reliability evaluation can be obtained. Compared with the traditional Fault Tree Analysis(FTA), this method enjoys a more powerful analysis ability and its results are more closely verified by practice. It can be applied to the reliability analysis of the safety system in NPP.

Simulation of Strength for the Throat-insert of a SRM Nozzle Based on Abaqus

FAN Jie;WANG Yuening
Science & Technology Review. 2013, 31 (33): 58-61. ;  doi: 10.3981/j.issn.1000-7857.2013.33.009
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Abstract ( 246 )
The simulation results should be consistent with the actual situation of structure, when the finite element simulation software is used to analyze the structural strength. In order to reduce the influence of the simulation result, the simplified models should be identical with the structure. Throat-insert of a SRM nozzle is one of the most important parts, which compresses gas in the process of motor working. It is very important to make strength analysis on throat-insert of a SRM nozzle. In this paper, a throat-insert of SRM was taken as an example. Three structure finite element throat models were created and calculated by the Abaqus software, and the three simplified methods are commonly used in the strength analysis of SRM. At last, the strength results were compared and discussed. The results show that different simplified models may have a significant impact on the results. Therefore, the specific situation should be analyzed according to the particular request in the finite element simulation, in order to ensure the accuracy of calculation results.

Selection of the Maintenance System and Key Technology for Carrier-based Aircraft

LI Mansi;CHEN Chunliang;SHANG Yongshuang;MENG Shang
Science & Technology Review. 2013, 31 (33): 62-67. ;  doi: 10.3981/j.issn.1000-7857.2013.33.010
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Abstract ( 275 )
The maintenance support system of the carrier-based aircraft involves a high complexity of maintenance work. It is important to enhance the support effectiveness for the carrier-based aircraft, especially, to improve the maintenance system and the maintenance methods. To meet the requirements of the future integration joint combat, improve the combat readiness integrity and enhance the operational capability, the formulation of the carrier-based aircraft maintenance must keep pace with the time. It is an effective way to increase the level of operational readiness and reduce life-cycle costs by constructing a reasonable carrier-based aircraft maintenance system. The operation modes of the carrier-based aircraft under the three-level maintenance system and the two-level maintenance system at home and abroad are compared, the disadvantages of the three-level maintenance system are analyzed,and the foreign advanced concepts of the military aircraft maintenance are considered. With some issues in the carrier-based aircraft maintenance support system in mind, the mode of the carrier-based aircraft two-level maintenance and the key aspects related to the system are discussed.

An Analysis of China’s Public Scientific Literacy

WANG Jingying;ZHANG Yue;MENG Hongyan;REN Fujun
Science & Technology Review. 2013, 31 (33): 68-74. ;  doi: 10.3981/j.issn.1000-7857.2013.33.011
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Abstract ( 343 )
The public scientific literacy is related with the comprehensive quality and the creativity of the talents and the comprehensive competitive power of a country. The survey of the public scientific literacy may serve as an important reference for the policy-making and assessment. It was conducted eight times in our country. This paper analyzes the changes of citizens' scientific literacy, makes comparisons among different groups and the changes of public cognition of scientific and technological information based on the data obtained in surveys of the years 2001, 2003, 2007 and 2010. An improvement of the public scientific literacy is seen on the whole, with a small increase of science understanding and a decrease of superstition dependence year by year. An analysis of the differences in population groups about the public scientific literacy shows that the age of people with the basic scientific literacy becomes younger in average and the male have higher proportion than the female, the people with higher education tend to have higher standard, more than half of the people with the basic scientific literacy are in the east region, the middle region takes the second place and the west region takes the last place. Besides the formal education, the television and the press are the main channels for people to obtain science and technological information. Public interest focuses on culture and education. Teachers, scientists and doctors tend to have a high cognitive level on science and technology.
Reviews

Improvement of the Performance Parameters of Boron-lined Proportional Counter

ZHAO Xiuliang;CHENG Xiaolong;ZHOU Jianliang;LIU Liyan;YANG Zhiyuan
Science & Technology Review. 2013, 31 (33): 75-79. ;  doi: 10.3981/j.issn.1000-7857.2013.33.012
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Abstract ( 167 )
The factors related to the performance parameters of a Boron-lined proportional counter are discussed in this paper, the approaches and techniques for improving the performance are summarized and analyzed based on the structure design, the manufacture technique and the moderator of the Boron-lined proportional counter. The effects of an enriched 10B and the Boron-lined floor thickness on the detection efficiency are determined, the technical tendency of adding the surface area, the Boron-lined method and the thermostability is illustrated. The Boron-lined proportional counter will be developed in the way of choosing more suitable filling gas, better-developed anode wire mounting technology and Boron-lined technique in the future.
书评

Science & Technology Review. 2013, 31 (33): 80-80. ;  doi:
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Abstract ( 100 )
主编心语

Science & Technology Review. 2013, 31 (33): 83-83. ;  doi:
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Abstract ( 108 )
科技纵横捭阖

Science & Technology Review. 2013, 31 (33): 84-84. ;  doi:
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Abstract ( 109 )
科技职场

Science & Technology Review. 2013, 31 (33): 85-85. ;  doi:
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Abstract ( 91 )

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