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   Science & Technology Review
2012, Vol.30, No. 1
08 January 2012

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Science & Technology Review. 2012, 30 (1): 1-1. ;  doi:
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Science & Technology Review. 2012, 30 (1): 8-8. ;  doi:
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Science & Technology Review. 2012, 30 (1): 10-10. ;  doi:
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Science & Technology Review. 2012, 30 (1): 12-12. ;  doi:
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Science & Technology Review. 2012, 30 (1): 13-13. ;  doi:
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Science & Technology Review. 2012, 30 (1): 14-14. ;  doi:
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Science & Technology Review. 2012, 30 (1): 75-75. ;  doi:
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Science & Technology Review. 2012, 30 (1): 88-88. ;  doi:
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Science & Technology Review. 2012, 30 (1): 95-95. ;  doi:
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Science & Technology Review. 2012, 30 (1): 96-96. ;  doi:
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卷首语

Science & Technology Review. 2012, 30 (1): 3-3. ;  doi:
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Abstract ( 194 )
科技风云

Science & Technology Review. 2012, 30 (1): 7-7. ;  doi:
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封面图片说明

Science & Technology Review. 2012, 30 (1): 8-8. ;  doi:
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科技事件

Science & Technology Review. 2012, 30 (1): 9-9. ;  doi:
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科技工作大家谈

Science & Technology Review. 2012, 30 (1): 11-11. ;  doi:
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Science & Technology Review. 2012, 30 (1): 15-17. ;  doi: 10.3981/j.issn.1000-7857.2012.01.001
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Abstract ( 204 )
Articles

Susceptibility Analysis of Impact Factors of Landslides Triggered by Yushu Earthquake

XU Chong;XU Xiwei;YU Guihua;WU Xiyan
Science & Technology Review. 2012, 30 (1): 18-24. ;  doi: 10.3981/j.issn.1000-7857.2012.01.002
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Abstract ( 472 )
2036 landslides were triggered by the 2010 Yushu earthquake, in a total area of 1.194km2. The Landslide Area Percent (LAP) and the Landslide Number Density (LND) are selected as two indices for the susceptibility analysis of landslide impact factors. The impact factors of landslides include the earthquake impact factors such as the epicenter, the macro-epicenter, the main co-seismic surface fault-rupture, the Peak Ground Acceleration (PGA), and the co-seismic displacement; the topography impact factors such as the elevation, the slope angle, the slope aspect, the slope curvature, the slope position, and the drainages; the geology impact factors such as the lithology and the faults; and other impact factors such as the roads and the Normalized Difference Vegetation Index(NDVI). The results show that: (1) Both LAP and LND have strong positive correlations with the distance from the main co-seismic surface fault-rupture, and also have positive correlations with the macro-epicenter and co-seismic displacement except for individual classifications, but the correlations between the landslide occurrences and the epicenter, and PGA are not clear-cut. (2) The greater the slope angle, the higher the probability of landslide occurrence; the elevation less than 4000m sees a high susceptibility to landslide occurrences; it can be found that the slopes facing NE, E, and SE see relatively higher LAP and LND values than other directions; the higher the slope position, the higher the landslide susceptibility except for flat slope; landslides have positive correlations with the distance from drainages; rough slopes are more prone to landslide occurrence than smooth slopes. (3) The stratums of Q4al-pl (Alluvium, fluvial deposits, gravel), N (Quartz sandstone, breccia), and T3kn1 (Feldspathic sandstone, siltstone, slate, limestone, phyllite) see concentrated landslide activities, the correlation between the landslide occurrences and the faults is not clear-cut. (4) The closer to roads and the more sparse of the vegetation, the more susceptibility to landslide occurrences.

Relationship Between Characteristics of Sequence Stratigraphy and Hydrocarbon Accumulation on CI Oil Formation of Tazhong 4 Oilfield

XU Yin;XU Huaimin;NIU Yujie;ZHAO Hong;SHE Jiaofeng
Science & Technology Review. 2012, 30 (1): 25-29. ;  doi: 10.3981/j.issn.1000-7857.2012.01.003
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Abstract ( 261 )
Combined with the theory of sequence stratigraphy and hydrocarbon accumulation, the characteristics of sequence stratigraphy and hydrocarbon accumulation mode of CI oil group in Tazhong 4 oilfield are discussed which is based on the sequence characteristics and sedimentary system and hydrocarbon accumulation conditions,etc. Using the datum of seismic, well logging and coring, CI oil group in Tazhong 4 oilfield can be divided into 2 third-order sequences, 5 subsequences units, 9 parasequences, and both tidal and Delta depositional systems have been identificated by research of faces in the trellis of sequence stratigraphy. On the basis of the sequence and sedimentary characteristics, hydrocarbon accumulation elements of petroleum geology are analyzed, and hydrocarbon accumulation along the fault-transporting allochthonous model has been established. For hydrocarbon sources rocks are hardly found in CI oil group,oil and gas comes mainly from the underlying Ordovician and Cambrian source rocks,reservoirs are mainly distributed in transgressive system tracts of SQ1 and SQ2. Oil and gas along the big break migrated up to CI oil group and accumulation. There types of reservoirs of lithologic hydrocarbon, faults-lithologic hydrocarbon and micro-anticline are developed.

Energy-conserving Stereolithography System with UV-LED Light Source

XIE Ruidong;LI Dichen
Science & Technology Review. 2012, 30 (1): 30-33. ;  doi: 10.3981/j.issn.1000-7857.2012.01.004
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Abstract ( 276 )
An inexpensive stereolithography (SL) system with high power UV-LED curing light source, the LED-SL, is developed. The working principle of the UV-LED light based SL system (LED-SL) and its characteristics are discussed. The divergent UV light emitted from the LED is focused on the resin surface by a set of focusing lens. Controlled by the computer, the workbench drives the scanner to move along X-Y plane, and polymerizes the liquid resin according to the current cross-section of a layered part. The advantages of UV-LED light source are analyzed. Because of the kinematic behavior of the mechanical scanning workbench, the exposure at the ends of a single cured line is much greater than that in the middle segment, and hence bone-shaped errors would occur, which means that the ends of a cured line have larger sizes than the middle segment. The power matching scanning method is used to improve the accuracy of a cured line, dynamically adjusting the beam power to ensure that the power is proportional to the scanning speed. The experimental results indicate that the power matching method can effectively improve the building accuracy. The SL energy consumption of UV-LED, laser and UV lamp sources are experimentally compared, and the results show that the energy consumption of UV-LED is merely 0.86% of laser and 0.1% of UV lamp, an outstanding energy conservation performance of the LED-SL.

Design of a Reliability Test Platform for High-speed Motorized Spindles Based on Power Dynamometer and Piezoelectric Loading Systems

HU Ye;YANG Zhaojun;SONG Jing'an;ZHU Yan;WANG Kai;FANG Jie;HOU Yuchen
Science & Technology Review. 2012, 30 (1): 34-38. ;  doi: 10.3981/j.issn.1000-7857.2012.01.005
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Abstract ( 278 )
The performance of the high-speed motorized spindle strongly affects the performance of the high-speed CNC machine tool. To improve the MTBF level of a high-speed CNC machine tool, it is of great importance simulating the real working condition of the motorized spindle and developing a reliability test platform. In this paper, a reliability test platform for high-speed motorized spindles is designed based on power dynamometer and piezoelectric loading systems. The reliability test of the motorized spindle can be carried out with a rotation speed over 18000r/min; the performance indices of the high-speed motorized spindle can be determined, such as the performance of the temperature rising control, the radial runout and the axial play of the motorized spindle; with the power dynamometer and piezoelectric loading systems, the loading condition of the spindle can be simulated, including the radial force, the axial force and the torque, and the dynamical loading test of the motorized spindle can be carried out; the failures during the test can be detected; the information of the test can be recorded, and the reliability analysis can be made according to the data collected from the test, providing a quantitative evaluation platform for improving the reliability of the motorized spindle.

Wind-induced Response of a Tower Structure Under Fluctuating Wind Load

WAN Chunfeng;HUANG Lei;WANG Jiang;ZHU Hong;
Science & Technology Review. 2012, 30 (1): 39-43. ;  doi: 10.3981/j.issn.1000-7857.2012.01.006
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Abstract ( 348 )
In this paper, an autoregressive model (AR model) is used to simulate the wind speed time series. The spectrum of the simulated wind speed time series is found in agreement with the target spectrum, i.e., Davenport wind speed spectrum. The relationship between the wind load and the wind speed is derived according to the related Chinese codes. Samples of the fluctuating wind load on the nodes of a structure are obtained. Simulations with the Finite Element Method (FEM) are carried out for a 42m-high communication tower. The tower is made of Q235 steel. ANSYS software is used to build the FEM model. 188 elements of beams are applied for the main members of the tower structure, while link elements are applied for the web members. The wind load time history series are simulated by using Matlab software and are used as the input loads. The modal analysis shows that the first several modes of the structure are all plane vibration modes, and after the 3rd mode one may find torsional vibration modes and local vibration modes. Meanwhile, the time history analysis is used to determine the structural responses under wind loads. Results show that, under fluctuation wind loads, the horizontal displacement is much smaller than the value suggested by the code for the design of high-rising structures. However, it should be noted that the transmission tower experiences a large stressing in the chords where the section of the tower changes.

A Model of the Cooling Tower of a Continuous Hot Dip Galvanizing Line Based on Similarity Theory

XU Peimin;ZHANG Xuelong;XU Fei;WANG Wenjun
Science & Technology Review. 2012, 30 (1): 44-47. ;  doi: 10.3981/j.issn.1000-7857.2012.01.007
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Abstract ( 263 )
The cooling tower of a continuous hot dip galvanizing line is more than 60 meters high, with complex structure and with various equipments installed in it. The dynamic characteristics of the cooling tower have important effects on the strip vibration of the process section. In order to better reveal the effects of dynamic characteristics of the cooling tower on the strip vibration, this paper designs a model to simulate the cooling tower based on the theorem of the similarity theory. The LMS modal testing system is used to test the dynamic characteristics of the model and the prototype, and it is found that their dynamic characteristics are basically similar to each other. So a reliable tower model is obtained for a vibration testing device of the process section to investigate the strip vibration.

Research on Management System of Goaf Information Based on VRML

XIONG Lixin;LUO Zhouquan
Science & Technology Review. 2012, 30 (1): 48-52. ;  doi: 10.3981/j.issn.1000-7857.2012.01.008
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Abstract ( 468 )
The disaster goaf is widespread in the mines. After obtaining the accurate 2D information (such as size, roof area exposed, surrounding rock information, whether has been processed, treating method) and 3D information, the focus of the mining enterprises is how to manage these large amounts of information effectively. In order to solve this problem, network management system for goaf information were put forward. Integrated use of the empty area detection, three-dimensional modeling, computer security control and information systems development and other technology, research on network management system of goaf information was carried out. CMS, Surpac, QVOL and Vrmlpad were used integrated to obtain the 2D and 3D information of goaf accurate, and it proposed that through WEB call 3D model to achieve 3D visualization. Selecting browse/server structure, Using SQL Server 2005 as database platform for 2D information, then Microsoft Visual Studio 2008 was choose as a tool for exploiting network management system for goaf information. System function included logging of user; 2D information management of goaf, such as increase, delete, modify, search and print etc, viewing 3D shape of goaf through browse, it can meet the requirements of enterprise various departments for information management ,thereby providing services for the mine .

Fuzzy Muli-objective Reliability Optimization of Plow Based on Genetic Algorithms

ZHANG Qiang
Science & Technology Review. 2012, 30 (1): 53-55. ;  doi: 10.3981/j.issn.1000-7857.2012.01.009
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Abstract ( 270 )
For a reliable multi-objective optimization design of the prow system, the conventional optimization method can not treat cases with mutually contradictory attributes. To overcome this difficulty, this paper proposes a multi-objective fuzzy reliability optimization decision method based on genetic algorithms and non-probability distribution information. The special features of the fuzzy set membership function are used to reflect the relatively important degree of the objective function and the probabilistic perturbation method and Edgeworth series technique are used to transform the incomplete probability information into the standardized normal distribution function, then a simple target model is established for each goal coordinated degree, and the conventional optimization method is used to obtain the multi-objective optimization satisfactory solution. Finally, a plow example is given to verify this method.

The Design of Integrated Security System for Military Rear Depot Based on SOA

ZHAN Jianchao;ZHANG Changgen;WANG Tao;ZHU Zhu
Science & Technology Review. 2012, 30 (1): 56-59. ;  doi: 10.3981/j.issn.1000-7857.2012.01.010
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Abstract ( 255 )
In order to solve the problems involving lack of the application system architecture and the heterogeneous data integration and share in the security system construction of military rear depot, a four layer security system for military rear depot is constructed based on SOA. The system provides the standardized construction using SOA, establishes a comprehensive service data exchange system based on the Web component technology in the application system, realizes isomerism data exchange and data share, and achieves security subsystem integration in military rear depot. The system possesses the good extendibility and the maintainability.

Study on Thermal Characteristics of Ammonium Nitrate After Long-term Storage

WANG Ji
Science & Technology Review. 2012, 30 (1): 60-64. ;  doi: 10.3981/j.issn.1000-7857.2012.01.011
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Abstract ( 290 )
Development and implementation of security measures for storage of ammonium nitrate are lack of appropriate reference data, because of few studies for thermal characteristics of ammonium nitrate after long-term storage. In order to address this situation, the thermal decomposing parameters of ammonium nitrate, which have been stored for 10 years, 20 years, and new produced, were measured by using adiabatic accelerating rate calorimeter. The test data was amended by means of thermal inertia factor Φ. It was showed that when compared with the new produced ammonium nitrate, the initial decomposition temperature of ammonium nitrate stored for 10 years and 20 years was reduced by 42.26℃, 58.02℃ respectively; the maximum decomposition temperature was improved by 20.28℃ and 179.55℃; the temperature rise was increased by 62.54℃ and 255.57℃; the maximum rate of temperature rise was improved by 31.1 times and 99.3 times. Through the mechanism analysis of the long-term storage of ammonium nitrate, due to the dual catalytic nitric acid and water, the ammonium nitrate contained nitric acid and water, which led the thermal hazard of ammonium nitrate after long stored in room temperature deteriorated. The tests conclusions can be the beneficial reference for the store safety of ammonium nitrate.

Dehydrogenation and Sintering Process of Titanium Hydride for Manufacture Titanium and Titanium Alloy

ZHANG Jiamin;YI Jianhong;LEI Ting;FANG Zhigang;GAN Guoyou;YAN Jikang;DU Jinghong;FANG Shuming;WANG Hongtao
Science & Technology Review. 2012, 30 (1): 65-68. ;  doi: 10.3981/j.issn.1000-7857.2012.01.012
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Abstract ( 295 )
Using the titanium hydride powder directly as the starting material to manufacture the titanium and titanium alloy is a method that goes beyond the traditional powder metallurgy technology. Dehydrogenation and shrinkage of TiH2 powders with different particle sizes are studied using thermogravimetric and dilatometric techniques. The process factors such as the sintering temperature,, the sintering time, the heating rate,, the compaction density,, the compaction methods, and the alloy system, would affect the sintering densification of TiH2 powders and TiH2-Al-V alloy powder. It is shown that the dehydrogenation temperature of the starting and ending of the ball milling TiH2 is lower than that of the coarse TiH2 powders, the finer the TiH2 powder, the lower the temperature. The densification of TiH2 powders is easy because of the combination of dehydrogenation and shrinkage of α-Ti in one process, which creates the fresh dehydrided titanium uniform during sintering, thus leads to rapid densification and very high sintereing relative density, higher than 99%. In contrast, it is difficult to achieve a full densification of TiH2-Al-V alloy powder during sintering, which requires dissolution of alloy elements during sintering above its beta transformation temperature. The sintered microstructure of Ti-6Al-4V shows the typical lamellar shaped α+β characteristics,with a uniform alloy element distribution.

Model Establishment for the City Air Quality Assessment Based on Improved Extension Theory with Varying Weights

ZHAO Xiaoliang;QI Qingjie;ZHOU Yang;ZHENG Jiao
Science & Technology Review. 2012, 30 (1): 69-72. ;  doi: 10.3981/j.issn.1000-7857.2012.01.013
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Abstract ( 271 )
In order to realize quantitative description of logical domain instead of "belong to" or "not belong to" some set in classical extenics, an extenics engineering method was combined with cluster analysis to construct classical and limited matter elements according to air quality standards and main factors affecting air quality. The logical domain was extended from (0, 1) to (-∞, +∞). Analytic Hierarchy Process (AHP) was used to determine weights of air quality factors and establish improved extenics model with varying weight for assessing air quality. In view of no-strict attributes of city atmosphere sample and betweenness of their form and class attribute, five assessment factors which have great influence on the human health i.e. PM10, SO2, NO2, CO, and Fallen Dust are identified. The new model not only could reflect the whole level of air quality, but also identify the main air pollution facts which exert great impact. An improved extenics model is used to assess air quality in Fuxin city in the year of 2010. And then the results are compared with the results based on Shanghai air quality index method and fuzzy comprehensive evaluation method. The serviceability of new model in the applications of air quality assessment is analyzed. To a certain degree, the establishment of application-typed model dedicated to assessment and control of city atmosphere has its theoretical value and realistic guiding significance.

Solutions Existence of Semi-discrete Fourier Spectral Scheme in the Zakharov Equations

SUN Lu;ZHANG Fayong;ZHU Jie;CHEN Honghai;WANG Hongjiu
Science & Technology Review. 2012, 30 (1): 73-75. ;  doi: 10.3981/j.issn.1000-7857.2012.01.014
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Abstract ( 227 )
In order to study well-posed problem of the numerical solutions method for Zakharov equations in plasma physics, first, according to the periodic initial value problem of the equations, a semi-discrete Fourier spectral scheme is constructed in the closed region of [0, T]. Second, the conservative property of the semi-discrete spectral scheme is proved. And at last, the conservative property is used to obtain the priori estimate of approximate solution and the existence of global solution for Zakharov equations.
Reviews

Studies on Text Input Methods of Mobile Keypad

HE Canqun;WEI Xiujie;GE Liezhong
Science & Technology Review. 2012, 30 (1): 76-79. ;  doi: 10.3981/j.issn.1000-7857.2012.01.015
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Abstract ( 221 )
Keypad input based on thumb operation in the present as well as in the future will be irreplaceably used as an input mode in mobiles. Therefore the efficiency of mobile keypad text input has become one of important symbols weighting the level of mobile's usability. The paper concluded the studying developments of mobile keypad text input from different aspects such as improved study on mobile keypad text input, study on Chinese mobile keypad text input and model predict and evaluation. Based on the conclusions, the deficiencies of the present studies are pointed out as follows: the designed mobile keypads based on western languages are unfit for Chinese text input; there are many applying shortages in new Chinese text input method; users' opperating characteristics are not considered in many improved designs of mobile keypad. In the end, the future studying directions are brought out: Chinese mobile keypad can be omptimized according to the characteristics of users' operation and Chinese text input.It has very high applied value and considerable opperability so as to improve opperating performance of Chinese text input.
科技评论

Science & Technology Review. 2012, 30 (1): 80-80. ;  doi:
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Science & Technology Review. 2012, 30 (1): 81-81. ;  doi:
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Science & Technology Review. 2012, 30 (1): 82-82. ;  doi:
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主编心语

Science & Technology Review. 2012, 30 (1): 83-83. ;  doi:
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科技职场

Science & Technology Review. 2012, 30 (1): 84-84. ;  doi:
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Science & Technology Review. 2012, 30 (1): 85-87. ;  doi:
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Science & Technology Review. 2012, 30 (1): 89-92. ;  doi:
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