Synthesis of Benzaldehyde 1,2-Propylene Acetal Catalyzed by K₅CoW₁₂O₄₀·3H₂O
LAI Jun-ling, LIU Chun-sheng, LUO Gen-xiang，SHEN Fei
2010, 30 (2): 1-3. DOI:10.3696/j.issn.1672-6952.2010.02.001
Abstract ( ) PDF ( 140KB ) ( ) 　　
 
The catalytic activity of benzaldehyde 1,2-propylene acetal was investigated from benzaldehyde and 1,2-propylene glycol in the presence of potassium dodecatungstocobaltate trihydrate (K₅CoW₁₂O₄₀·3H₂O). The effects of the cyclohexanone/1,2-propylene glycol molar ratio, the amount of the catalyst, cyclohexane dosage, the reaction time and the using regenerated catalyst on yield were studied systematically. The results show that potassium dodecatungstocobaltate trihydrate (K₅CoW₁₂O₄₀·3H₂O) is an excellent catalyst for the above reaction. The preferable experimental conditions are as follows: benzaldehyde/1,2-propylene glycol molar ratio is 1∶1.2, benzaldehyde is 0.1 mol, potassium dodecatungstocobaltate trihydrate (K₅CoW₁₂O₄₀·3H₂O) is 0.3 g, the volume of cyclohexane is 10 mL, and reaction time is 45 min. Under the above experimental conditions, the maximum yield of benzaldehyde 1,2-propylene acetal is up to 92.8%.
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Analysis of Fouling Resistance of the Membrane and Cleaning Technique
JIN Wen-ying,ZHAO Yu，JIN Shan
2010, 30 (2): 4-7. DOI:10.3696/j.issn.1672-6952.2010.02.002
Abstract ( ) PDF ( 343KB ) ( ) 　　
 
It was studied simulated acrylic fiber wastewater treatment used membrane bioreactor. In Lab research, the fouling mechanisms of the membrane in microfihration were studied. Every kind of resistances in the simulated acrylic fiber wastewater treatment was analyzed. The results show that the fouling is mainly from concentration polarization and cake layer under the conditions of the lower operating pressure. However, the fouling mainly from cake layer under the conditions of the higher operating pressure. The resistances from the block and itself is small, thus, they are the minor factors for the membrane fouling. The method of membrane cleaning were proposed, that is, membrane flux is up to better level after 1% H₂O₂ solution washing for 30 min or 0.1 mol/ L NaOH solution washing for 60 min.
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Determination of Flavonoids From Codonopsis Pilosula by Microwave-Assisted Extraction and Spectrophotometer
WANG Qing-ming, ZHANG Jin-sheng, LI Li-hua, XUE Li-min
2010, 30 (2): 8-10. DOI:10.3696/j.issn.1672-6952.2010.02.003
Abstract ( ) PDF ( 209KB ) ( ) 　　
 
Flavonoids were extracted from Codonopsis pilosula by microwave-assisted extraction and its contents were determined by spectrophotometer. The extraction rate of flavonoids were investigated by single factor experiment included alcohol volume fraction, ratio of material to liquid, extraction temperature, and extraction time. The best conditions for procedure were as follows: extracting time is 15 min, extracting temperature is 85 ℃, the volume fraction of ethanol is 70%,  and material to liquid ratio is 1∶30. Under the optimal conditions, the amount of flavonoids in codonopsis pilosula was 2.87%, RSD=0.878%(n=5), and their recovery is between 99%～102%.
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Calculation of Statistical Values of Valence Electron Structure Parameters of Cu Simple Substance
LI Fei, ZHAO Xia
2010, 30 (2): 11-14. DOI:10.3696/j.issn.1672-6952.2010.02.004
Abstract ( ) PDF ( 209KB ) ( ) 　　
 
Based on the empirical electron theory of solids and molecules, the valence electron structure and statistical values of valence electron structure parameters of Cu simple substance (n′_A, E′_A ) were analyzed and calculated. The calculation method of statistical values of valence electron structure parameters was given, and the statistical values n′_A, E′_A were compared with the most probable value n_A and E_A. The calculation results show that a type hybridization of Cu atoms are on the first to twelfth hybrid level which the status of their practice that may exist. The calculation deviation of the statistical values n′_A, E′_A and the corresponding most probable value n_A, E_A are 5.72% and 6.86%, respectively. These results show that n_A and E_A can be replaced by n′_A and E′_A for discussing the macro properties of Cu.
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Finite Element Analysis of Vibration Characteristics for a Gear-Shafts System
LI Fan, WU Xing-ming, WENG Lei, ZHANG Cui-cui, ZHU Xiang-zhe
2010, 30 (2): 15-18. DOI:10.3696/j.issn.1672-6952.2010.02.005
Abstract ( ) PDF ( 395KB ) ( ) 　　
 
Based on the theories of rotor dynamics and gear meshing, the finite element model of a gear-shaft system was established according to a certain gear transmission system of a steam unit. The bending and torsional modes of the single gear wheel and coupling gear-shaft system were calculated and compared respectively. The effect of gear stiffness on the critical speeds of the coupling gear-shaft system was studied. Moreover, the imbalance responses of the single and coupling system were employed. The calculated results offer some academic reference of gear system design.
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Analysis of Explosion of Tube With High Salt Recycling Water in Steam Injection Boiler
LU Qin-li，LIU De-jun，MA Gui-yang，SHEN Long-she
2010, 30 (2): 19-22. DOI:10.3696/j.issn.1672-6952.2010.02.006
Abstract ( ) PDF ( 207KB ) ( ) 　　
 
The steam injection boiler of Liaohe oil field Jinzhou oil extraction factory produces steam with recycling water. Because of water quality over standard, silica and salt fouling and crystallizing resulted in over temperature of the tube in superheated region, allowed stress decreases sharply and explosion of tube. With maximum flame diameter 3 m, it is happen that silica and salt fouling and crystallizing at the same time resulted in explosion of tube. The main method to solve above problem is decrease steam dryness or alternative variation, and the two worst working conditions  don′t  occurred at same time.
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Simulation of Drop Track in Cyclone Stream-Water Separator
LI Na，CHEN Bao-dong
2010, 30 (2): 23-25. DOI:10.3696/j.issn.1672-6952.2010.02.007
Abstract ( ) PDF ( 280KB ) ( ) 　　
 
The strong swirl turbulent flow and the movement of drops in the cyclone separator are very complex and much more random. So it is very difficult to predict the law of flow with parse means. In order to study the condition of motion of the drops inside a stream cyclone separator of the type stairmand and it′s mechanism of separation, three-dimensional numerical simulation of internal flow field of stream phase and the motion condition of drops in it were conducted by using the software fluent. The results show that the moving tracks of small drops and big drops are different, even if their original locations are the same. The effect of the flow pulse and the toted action from big drops is very marked for the small drops, so the probability of its appearance in second flow is also much, and the effect for the capability of separation is also much. therefore， the drop is more big, the separation efficiency is more high.
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Influence of Two-Phase Region Heat Treatment on Cryogenic Toughness in 9Ni Steel
GUO Kui-wen, ZHU Jian, WANG Bing-xin
2010, 30 (2): 26-28. DOI:10.3696/j.issn.1672-6952.2010.02.008
Abstract ( ) PDF ( 457KB ) ( ) 　　
 
The effect of process parameters for intercritical heat treatment (IHT) on the microstructure and low-temperature toughness in 9Ni steel were investigated by means of SEM and XRD, etc. The experimental results show that intermediate quenching temperature and tempering temperature have obvious influence on cryogenic toughness. The higher or lower heat treatment temperature brings about the decrease in impact toughness. The reversed austenite distributes more dispersively and homogeneously, and much precipitates in specimens treated by IHT process compared with those treated by quenching and tempering process.
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Determination of the Time for Oil on Buried Hot Oil Pipelines  in the Course of Starting Transportation
GU Jin-tong，MA Gui-yang
2010, 30 (2): 29-31. DOI:10.3696/j.issn.1672-6952.2010.02.009
Abstract ( ) PDF ( 239KB ) ( ) 　　
 
Using finite element method, the soil temperature field around the buried hot oil pipeline during starting transportation was calculated numerically. Then the time for oil was identified precisely. The results show that 20 h after preheating for oil can be in line with the requirement. The results are in accordance with engineering. A reliable theoretical basis is provided for hot oil pipeline to operate economically and securely through applying the technology.
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Dynamic Reliability-Based Robust Optimization Design for Mechanical Components
WANG Li, WANG Xin-gang
2010, 30 (2): 32-36. DOI:10.3696/j.issn.1672-6952.2010.02.010
Abstract ( ) PDF ( 351KB ) ( ) 　　
The variation rules of strength, load and reliability of mechanical components were studied with the change of time, and a model for dynamic reliability of mechanical components was established under the random load acting. According to the model, the design of dynamic reliability sensitivity was discussed as well as the approach to calculate dynamic reliability sensitivity was proposed, meanwhile, combining the theory of reliability-based optimization design with the method of sensitivity analysis, the computation model of dynamic reliability-based robust optimization design was established, then the problem of dynamic reliability-based robust optimization design of mechanical components is solved.
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Design and Implementation of Embedded Multiaspect Video Monitoring System
LI Jian, HOU Tong-pu
2010, 30 (2): 37-41. DOI:10.3696/j.issn.1672-6952.2010.02.011
Abstract ( ) PDF ( 656KB ) ( ) 　　
 
Based on embedded system and network communication technology, a multiaspect video monitoring system was designed and developed from the angle of functional diversity. AV capturing, playing and AVI file recording were implemented in local monitoring; remote video playing and transcription were implemented based on IP network in client monitoring; the monitoring page can be obtained in the browser by means of establishing a embedded Web server; the site images can be send to users' cellphone anytime via GPRS network in MMS monitoring. The experimental results show that the above-mentioned four kinds of monitoring modes can work in parallel and achieve the expected effect.
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Design of Specialized Search Engine Based on Meta-Search Engine
CHEN Yan, WEI Hai-ping, SUN Dian-zhe
2010, 30 (2): 42-45. DOI:10.3696/j.issn.1672-6952.2010.02.012
Abstract ( ) PDF ( 237KB ) ( ) 　　
 
Professional search engine can provide users with much more accurate professional information than general search engines. According to the operational principle of search engines, a design framework of professional search engine based on meta-search was presented, and the technology of information collection, Chinese word segmentation and results processing was introduced. For the sake of further enhancing the query efficiency of professional search engine, this system combines neural networks with genetic algorithm to filter and sort the results of meta-search.
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Design and Implementation of Data Mining Platform Based on Plug-in Technology
YU Chen－yun, LIU Yang*, ZHOU Jin－zhi
2010, 30 (2): 46-49. DOI:10.3696/j.issn.1672-6952.2010.02.013
Abstract ( ) PDF ( 332KB ) ( ) 　　
 
The Eclipse plug-in technology and data mining techniques were introduced. It was analyzed the mainstream of today’s open source data mining platforms, and it was compared, collated and summarized by means of experiments. Based on the experiments, the solution scheme was proposed. It was designed and implemented that an open source data mining platform based on Eclipse plug-in technology. The platform is modular, so it’s easy to maintain and extend. And there is no dependency between its processing unit and the data container, which makes it more suitable to a distributed environment and independent development.
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Designation and Implementation of Ship Scheduling System Based on Web Services
XUE Feng, FENG Xi-wei, ZHANG Tong-wei, WANG Jian, CHEN Jian-peng
2010, 30 (2): 50-52. DOI:10.3696/j.issn.1672-6952.2010.02.014
Abstract ( ) PDF ( 242KB ) ( ) 　　
 
The technology of SOA and Web Services and their private featrues were introduced. Backed by the actual project, it was expounded that the implementation of C/S multiple architecture based on Web Services. At last, the key technology of Web Services was discussed in details in the ship scheduling system. Currently, the system has been deployed and is running well in Zhoushan Port.
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Adaptive Predistortion Techniques Based on Block-Oriented Model
SHEN Qing-bo，DING Yuan-ming
2010, 30 (2): 53-57. DOI:10.3696/j.issn.1672-6952.2010.02.015
Abstract ( ) PDF ( 376KB ) ( ) 　　
 
The advantages and disadvantages of the previous predistortion methods for high power amplifiers (HPA) in orthogonal frequency division multiplexing (OFDM) transmitter were compared and summarized systematically. Block-oriented model-based adaptive digital predistortion technique was presented to compensate for the distortions in HPA with memory. The proposed predistortion schemes were explained, where the adaptive predistorters of HPA with memory were constructed based on Wiener model, Hammerstein model and Wiener-Hammerstein model, respectively. Thus, the complexity of the model parameters of all aspects of Wiener-Hammerstein estimated is avoided, separately. This makes the predistortion design of a high power amplifier with memory became simple.
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PID Control of Double Inverted Pendulum Based on RBF Neural Network
WANG Hong-nan
2010, 30 (2): 58-61. DOI:10.3696/j.issn.1672-6952.2010.02.016
Abstract ( ) PDF ( 293KB ) ( ) 　　
 
A method of PID control based on RBF neural network for double inverted pendulum was proposed. The parameters of PID controller are tuned by RBF network, so can achieve a optimal controller, and realize the stability control for double inverted pendulum. The simulation results show that it has higher accuracy, faster response and smaller overshot. The proposed method has better control effect for the multi-variable, nonlinear and fast system.
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Grouping Mechanism Based on Social Network in P2P Setting
WANG Xue-tao, BI Yu-shen, TIAN Qian-jin
2010, 30 (2): 62-64. DOI:10.3696/j.issn.1672-6952.2010.02.017
Abstract ( ) PDF ( 244KB ) ( ) 　　
 
The existing security problems in P2P were analyzed. A grouping mechanisms based on social network was presented. The mechanism based on the social networks members of the management divides nodes into different groups, and the nodes in the same group have the same resources. So it can avoid unnecessary requests effectively and reduce the possibility of mutual adverse comments. The requests between different groups of nodes can be more efficient.
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Reliability Test for Weibull Zero Failure Data
WEI Xiao-li, HOU Jing-chen, SONG Dai-cai
2010, 30 (2): 65-67. DOI:10.3696/j.issn.1672-6952.2010.02.018
Abstract ( ) PDF ( 147KB ) ( ) 　　
 
Bayesian method was used to study the problem of the reliability demonstration test for Weibull distribution. Under the conditions of the shape parameter is unknown, while scale parameter is known，assuming the certain reliability index being a fixed figure, the reliability demonstration testing procedure for the zero failure data of Weibull distribution was given.
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Symplectic Geometry Characterization of Self-Adjoint Domains for Symmetric Differential Operators in Direct Sum Spaces(Ⅳ)
WNAG Zhi-jing
2010, 30 (2): 68-70. DOI:10.3696/j.issn.1672-6952.2010.02.019
Abstract ( ) PDF ( 152KB ) ( ) 　　
 
The characterization of self-adjoint domains for symmetric differential operators with interior singular points in the direct sum spaces was investigated. By constructing different quotient spaces, using the method of symplectic geometry, the self-adjoint extensions of symmetric differential operators in the direct sum spaces for the different deficiency indices at middle deficiency indices singular points were studied. The classification and description of complete Lagrangian subman-ifold that correspond with self-adjoint domains of second order differential operators were given.
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Design and Property With Digital Measuring Temperature System
FU Shi-min, YU Zhen
2010, 30 (2): 71-73. DOI:10.3696/j.issn.1672-6952.2010.02.020
Abstract ( ) PDF ( 148KB ) ( ) 　　
A digital thermometer with 0.01 ℃ precision was introduced, whose A/D converter is made of the digital voltmeter, whose magnify circuit is made of the integrated operational amplifier OP07 and whose temperature sensor is made of a transistor tube. The principle of temperature sensor and the procedures of the hardware structuring as well as working principle of this kind of digital thermometers were introduced. The experiments and tests results show that the digital measuring temperature system has up to the required standards.
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α-Chain Diagonally Dominant Matrix and Criterion for Nonsingular H -Matrix
WANG Ming-gang， SONG Dai-cai, MIAO Chen
2010, 30 (2): 74-77. DOI:10.3696/j.issn.1672-6952.2010.02.021
Abstract ( ) PDF ( 166KB ) ( ) 　　
 
Let A=( a_ij)∈C^n×n, if there exists α∈ (0,1) which can make|a_ii|≥R^α_i(A)S^1-α_i(A) be right for i∈N={1,2,…,n}, then A is called a chain diagonally dominant matrix. the concept was extended to generalized α-chain diagonally dominant matrix，and the concept generalized α-chain diagonally dominant matrix was applied to obtain some new criteria condition for a matrix to be a nonsingular H-matrix. The results obtained improve the known corresponding results．Finally, a numerical example was given for illustrating advantage of results．
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Phase Transitions of Ising Model in Nearest Neighbor Interaction With Fe₄N Structure
XU Xing-guang, ZHAO Jie
2010, 30 (2): 78-80. DOI:10.3696/j.issn.1672-6952.2010.02.022
Abstract ( ) PDF ( 290KB ) ( ) 　　
 
The Ising model with Fe₄N structure was studied within the mean-field theory. The theoretic expressions of magnetization and free energy in the nearest neighbor interaction system were deduced. The magnetization curves and phase diagrams were given at a fixed value of through numerical calculation, and the phase transition characteristics were obtained. It was found that the second-order phase transitions were general phenomena, and the first order-order, the first order-disorder phase transitions and reentrant phenomena only exist in a certain range of crystal field. In the phase diagram the curves of reentrant phenomena, the first order-order and the first order-disorder phase transitions intersect at one point. It was found that the phase transition characteristics in the phase diagram at low temperature are completely consistent with the characteristics in the ground-state phase diagram.
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Particle Swarm Optimization of Box Constrained Variational Inequalities
LIU Guo-zhi
2010, 30 (2): 81-84. DOI:10.3696/j.issn.1672-6952.2010.02.023
Abstract ( ) PDF ( 158KB ) ( ) 　　
 
Based on simple smooth merit function for the box constrained variational inequality problems, a new method named particle swarm optimization (PSO) used to solve the box constrained variational inequality problems was proposed. The proposed algorithm has not only the simple, also the fast convergence and high computational precision. The computational results show that the proposed algorithm is superior to damped Newton type method and regularized semi- smooth Newton method.
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Distance Between Fuzzy Number and Intuitionistic Fuzzy Sets
FAN Chuan-qiang
2010, 30 (2): 85-88. DOI:10.3696/j.issn.1672-6952.2010.02.024
Abstract ( ) PDF ( 317KB ) ( ) 　　
 
A new fuzzy number intuitionistic fuzzy sets distance was defined. A distance formula used to calculate an example was give and proved. Finally, the formula was used to calculate an instance. The result calculated example shows that the commodity prices can be assessed through the fuzzy estimation and calculation using the distance formula under the absence of accurate data.
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Influences of Non-Financial Indicators on Financial Early-Warning for China ′s Listed Companies
QIAN Guang-ming, CHEN De-yan
2010, 30 (2): 89-92. DOI:10.3696/j.issn.1672-6952.2010.02.025
Abstract ( ) PDF ( 147KB ) ( ) 　　
 
Taking 62 Chinese ST industrial enterprises of listed companies as the research samples, and taking 62 Non-ST industrial enterprises of the same caliber as the paired samples, Influences of non-financial indicators on financial early-warning for Chinas listed companies were studied by using mean significance analysis, multi-collinearity analysis, and regression analysis. The results show that financial indicators and non-financial indicators should be comprehensive considered on the study of ST listed companies, and that establishing an early warning model using non-financial information and financial information will better warn the financial dilemma of listed companies.
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Empirical Study on the Later-Evaluation Index System for Communication Enterprise
MA Ying
2010, 30 (2): 93-96. DOI:10.3696/j.issn.1672-6952.2010.02.026
Abstract ( ) PDF ( 138KB ) ( ) 　　
With the intensifying of China’s communications market competition, it is very important that the companies build a comprehensive later-evaluation index system for completed projects, guided communications projects. The communications enterprise project later-evaluation 23 index layer in Liaoning Fushun Netcom Subsidiary Shenyang University of Technology Institute of Technology campus network were determined, and the construction project was studied after the evaluation of the empirical analysis. Meanwhile, the evaluation results and recommendations were given.
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