Application of Uniform Design in Preparation of Nano SO₂ ^-4 /SnO₂ Solid Superacid
REN Li -guo, ZHANG Xiao -li, YU Ji -w ei
2008, 28 (1): 1-4.
Abstract ( ) PDF ( 193KB ) ( ) 　　
        The preparation conditions of solid superacid SO₂ ^-4 /SnO₂ were investigated by uniform design , and the solid superacid was used as catalyst in the synthesis of n-butyl oleate .The optimum conditions of preparation of SO₂ ^-4 /SnO₂ were determined by regression analysis and single factor more level analysis , i.e ., the concentration of impregnating solution is 3 .0mol/ L , impregnating time is 0.5 h , calcinating temperature is 400 ℃, and calcinating time is 1h .Under optimum conditions, the yield of esterification is up to 99 .22%.At the same time , the catalyst was used repeatedly for 5 times without any apparent loss of the conversion and the yields of esterification is 94 .03%.
Related Articles | Metrics

Cyclohexyl Acetate Synthesized by the Environmentally Benign Catalyst
ZHANG Xiao -li,GAO Wen -yi
2008, 28 (1): 5-7.
Abstract ( ) PDF ( 166KB ) ( ) 　　
　    Cyclohexyl acetate was synthesized from acetic acid and cyclohexyl alcohol in the presence of solid super acid catalyst SO₂^-4 -TiO₂/Al₂O₃ .Factions of esterification reaction were stuelieel The optimal conditions of operation are as follows :the calanced temperatures of catalyst 500 ℃, n(acetic acid)∶n(cyclohexyl alcohol)2 .0 ∶1, the amounts of catalyst 2 .0 g ,cyclohane 15mL, the reaction time 2 h .Under the optimal conditions of operation, the yields of cyclohexyl acetate is up to 94 .1%.
Related Articles | Metrics

The Water -Solubility Modification of the Epoxy Resin Coating#br#
GAO Wen -yi,REN Li -guo,LING Li -feng
2008, 28 (1): 8-12.
Abstract ( ) PDF ( 299KB ) ( ) 　　
　    Epoxy -acrylic emulsion was synthesized from epoxy resin and acrylic by graft -polymerization, which is self -emulsified and self -crosslink water -borne anticorrosive emulsion .The influences of temperature , reaction time , molecular weight of epoxy resin, acid number of synthetic resin , concentration of initiating agent , solvent and neutralization agent on the dispersal stability of synthetic resin and conversion of monomer were investigated .The results show ed as follows:the appropriate mass ratio of butylcello solve to n -butyl alcohol in cosolvent is 2 ∶3 , the molecular weight of epoxy resin is over 2 900 , acid number of synthetic resin is 80 mg(KOH)/g , content of benzoperoxide is 6 % of the content of monomer , reaction temperature is 120 ℃, and reaction time is 5 hours .The resin was salified with the mixed solvent of N, N-dimethylaminopro -alcohol and water .At this time , neutralized degree is 70%～ 80% and the pH value is 7.5 ～ 8 .5 .Under optimum reaction condition , solid content o f emulsion is 20%～ 40 % and the emulsion is characterized with the excellent properties of deposit , dilution machinery and freeze -thaw .
Related Articles | Metrics

A romatization for FCC Naphtha Fraction on Modified HZSM -5 Catalysts
FENG Zhi -gang
2008, 28 (1): 13-15.
Abstract ( ) PDF ( 226KB ) ( ) 　　
　    HZSM -5 was modified by different method, and the aromatization performances of different modified HZSM -5 catalysts were investigated with a continuous fixed reactor using FCC gasoline(75 ～ 120 ℃fraction).The experimental results show that order in stability of catalysts is HZSM -5 <Zn/ H ZSM -5 <Zn/ HZSM -5(hy drothermal)<ZnSn/ HZSM -5 <ZnP/ HZSM -5 <ZnSn/ HZSM -5(hydro thermal)<ZnP/ HZSM -5(hydrothermal).The hydro thermal treated ZnP/ HZSM -5 catalyst has better decr easing olefins and aromatization activity and stability .Under reaction temperature 430 ℃, pressure 0 .1MPa , liquid hour space velocity 1 h -1 , the olefins conversion rate in feedstock is 83 .55%,olefins content and aromatics content in the liquid product are 7 .28 % and 81.96 %, respectively .Especially the content of toluene in the liquid product is up to 29.36 %.
Related Articles | Metrics

Comprehensive Utilization of Heat Energy in Steam Displacing Gathering and Transportation System
WANG Wei -min,WU Yu -guo,et al
2008, 28 (1): 16-18.
Abstract ( ) PDF ( 204KB ) ( ) 　　
        As the steam displacing project was implemented at block qi40 in Huanxiling oil recovery factory , the process parameters of steam displacing gathering and transportation system will change .Especially the temperature of oil -well output liquid will greatly increase up to 150 ℃.The high temperature will bring out lager superfluous heat .The main aims of the research are how to recovery and make use of the superfluous heat effectively , to reduce the production and operation cost .After consulting documents and analysis three initial plans were established .They are centralized heat exchange at combined station , centralized heat exchange at metering station and heat exchange at well head respectively .Based on the results of thermal calculation of gathering and transportation system and type selection calculation of heat exchanger , the three plans were compared from economy .The result indicates that the initial investment of centralized heat exchange at combined station plan is smallest and that the heat efficiency of heat exchange at well head plan is highest .
Related Articles | Metrics

Kinematics Stimulation for Three -TPT Parallel Machine Tool Based on Matlab
CHENG Xian -g uo,ZHAO Heng -hua
2008, 28 (1): 19-22.
Abstract ( ) PDF ( 721KB ) ( ) 　　
　    The machine constitute and working principle of a new three - TPT parallel machine tool was introduced,establishing the spatial coordinate of it and deriving the forward and reverse position of it on the basis .For the sake of the complicated and excessive forward positions of parallel machine tools, a few forward and reverse positions of the three -TPT parallel machine tool were stimulated by Matlab , which sets a good ground for reasoning and computing the velocity ,acceleration and power of the moving platform of it .At last , the maximum workspace of three -TPT parallel machine tool was stimulated by Matlab and measured its volume is 0.863 m³ .
Related Articles | Metrics

Heat Treatment Remote Expert System Based on Internet
SU Hui
2008, 28 (1): 23-27.
Abstract ( ) PDF ( 732KB ) ( ) 　　
　    A developing method was explored for heat treatment remote expert system based on Internet .The method transplanting the traditional expert system into the Inter net was adopted ;The heat treatment plan was determined using forward reasoning mechanism based on the rule and example ;Microsoft latest active server pages development technique ASP.NET was used to be the development tool of the system , and Access has been used to be the backstage data source , and ADO.NET technique was used to connect database , the multi -user can consult with the system without a break at the same time ;The key technique needed to realize the system function was introduced.Changing heat treatment expert system from the single machine to the Internet will raise the share and the convenience of the upgrade and the maintenance of system , which avoids isolated and aging of expert knowledge , and helps to build distributed heat treatment expert system on the Internet .
Related Articles | Metrics

Apply on Oil -Air Lubrication System of the Machine Pump Cluster in Petrochemical Device
SUN Chun -yi, QIU Di -fan
2008, 28 (1): 28-30.
Abstract ( ) PDF ( 205KB ) ( ) 　　
　    Along with developing continuously of the lubrication technology , appeared the oil -air lubrication to a technique ,the characteristics and work principle and system constitute of the oil - air lubrication were introduced.The key that the machine pump cluster of petrochemical equipment applied the oil-air lubrication was elaborated.The process of the lubricate calculation and the lubricate film calculation of oil-air two interblend fluid was discussed .With Y type oil pump lubrication of atmospheric -vacuum distillation device for example , the function of oil-air lubrication was explained .The result shows that this kind of technique has wide applied foreground in the petroleum chemical engineering profession .
Related Articles | Metrics

The Influence of the Network Layout in Refueling System on Hydraulic Transient
WANG Yue, FENG Yu-guo，WEI Tong-feng
2008, 28 (1): 31-33.
Abstract ( ) PDF ( 200KB ) ( ) 　　
With the example of airport refuel system network, aiming at the characteristics of loop pipe network and dendritic pipeline network, hydraulic transient mathematical model was set up respectively.And use characteristic method to simulate different arrangement of refuel system network of hydraulic transient, the examples simulation results show that hydraulic transient peak pressure of loop pipe network is lower than dendritic pipeline network,and the pressure of each parts of pipeline is even more equilibrium,and stability and reliability of pipeline is better, it can decrease effectively the destruction of hydraulic transient and the effects. Therefore, the using of loop pipe network is more suitable at airport refuel system network.
Related Articles | Metrics

The Computing Method of I-Mode Stress-Intensity Factor of Rigid Square-Ended Punch Using J-Integral
WANG Jian, XIE Yu-jun
2008, 28 (1): 34-36.
Abstract ( ) PDF ( 510KB ) ( ) 　　
Using finite element method, the nonlinear contact between a rigid punch and a elastic half plane was analyzed. Through modeling and computing with ANSYS, the value of J-integral around the edge of the punch was obtained. The conservation of J-integral was certificated by series of data. And the contact stress intensity factor (K_I) was gained through the relation between the J-integral and the K_I. The results indicate that the K_I by J-integral was in accord with the theoretical value. At last the KI of elastic plane with different thickness was calculated by the theory of J-integral.
Related Articles | Metrics

Stress Analysis on Hydrogenation Reactor Under Overheating Wall Temperature
LI Jin1, NING Lei1, ZHANG Zhong-yang2
2008, 28 (1): 37-40.
Abstract ( ) PDF ( 215KB ) ( ) 　　
Internal thermal of cold wall hydrogenation reactor often may become invalidation as a result of factors such as construction quality and working conditions. It leads to the reactor partially temperature extremely high. Because of the existence of thermal stress, overheating partial wall temperature is extremely disadvantageous to the equipment safe operation. The reactor in axial and circumferential thermal stress analysis and the calculation problem were studied. The stress analysis and computational method were put forward when ultra- warm spot is the square, the circular, the ring, the ellipse etc.
Related Articles | Metrics

Driving Mechanism of Electromechanical Integrated Toroidal Drive
LIU Feng1, XU Li-zhong2
2008, 28 (1): 41-43.
Abstract ( ) PDF ( 216KB ) ( ) 　　
Electromechanical integrated toroidal drive is a new-style transmission. Based on the theories of toroidal drive and electromagnetics, elastic force and friction are replaced by electromagnetic force, so it is contactless and non-lubriction .For the integration of transimission,driving and control, its structure size becomes smaller, and it is controllable also. Based on the force analysis of planet, space mechanics model was established, driving mechanism was discussed, and output torque formula was developed, the influence factor and influence law were analyzed. The result shows that the output torque is proportional to the factors such as planetary diameter and so on, but the increasing of planet can’t lead to the increasing of output torque.
Related Articles | Metrics

Numeric Study on Transient Heat Imbalance Response of Turbine Rotor-Bearing System
JIA Min, XIE Yu-jun, L Ling
2008, 28 (1): 44-47.
Abstract ( ) PDF ( 1058KB ) ( ) 　　
For heat distribution in turbine rotor-bearing system being imbalance, the rotor-bearing system would produce bent and vibrated strongly when it was started up. These would make system running unsafely. The transient imbalance responses of multi-degree rotor-bearing were analyzed respectively, while it was starting and running steadily. Furthermore, the heat vibration characters of the system and the impact caused by temperature distribution and starting acceleration were studied. It provides a reference for reducing the heat vibration amplitude of the rotary machine.
Related Articles | Metrics

Design of Spam Filtering System
WEI Yan-liang, HOU Li-gang, REN Li-jun
2008, 28 (1): 48-51.
Abstract ( ) PDF ( 213KB ) ( ) 　　
Along with wide application of e-mail nowadays, a large number of spam flood into people’s life and bring catastrophe to their work and study. Now new spam is changeable which makes traditional and single method for anti-spam powerless. In response to this problem, three popular spam filtering technologies were introduced, which have been implemented on spam filtering field. After analyzing their advantages and disadvantages, The white and black lists technology, Rule-based filtering technology and Bayesian filtering technology to make the best use of the advantage of these algorithms were integrated. Consequently a layered spam filtering system model was set up, and the performance analysis of the system was made.
Related Articles | Metrics

Handwriting Postal Codes Recognition Based on Improved BP Neural Network
GU Yan-wu, LI Ping, TAO Wen-hua, TIAN Shao-kuan
2008, 28 (1): 52-54.
Abstract ( ) PDF ( 497KB ) ( ) 　　
In order to solve the difficult problem of handwriting postal codes recognition, an improved coarse grid feature extraction approach which simplifies network input of the neural network was introduced. BP neural network based on LM algorithm for network studying was adopted. LM algorithm is an improved Gauss-Newton algorithm. The improved algorithm further enhances precision, stability and studying speed of the network studying through the simplification of the network input. The simulation results show that the algorithm is effective on the handwriting postal codes recognition.
Related Articles | Metrics

Intelligent Patrol and Coordinated Exception Emergency Handles System in Petro-Chemical Industry
QIAN Xin-hua, ZOU Yuan, XIAO Wu, HAN Zhi-zhong, WANG Ke-feng, YAO Ping-jing
2008, 28 (1): 55-58.
Abstract ( ) PDF ( 1317KB ) ( ) 　　
Intelligent patrol and coordinated exception emergency handle system in petro-chemical industry integrates mixed advanced technologies in safety science fields including GPS, GIS, GSM, IM. The system can help petrochemical companies to achieve electronic, information-based, intelligence of equipment patrol and fault management work, reduce all kinds of man-made factors such as failing to examination and false examination, and achieve instant cooperation exception emergency handles. The system has been used in ethylene plant of Fushun petrochemical company.
Related Articles | Metrics

Nonlinear Predictive Control Based on BP Neural Network
HUANG Yue-yang, LI Ping, LIU Xuan-yu
2008, 28 (1): 59-61.
Abstract ( ) PDF ( 232KB ) ( ) 　　
The technology of BP neural network was applied to the predictive control algorithm which was studied. The BP neural network was used to implement identity and multistep prediction. A new type of nonlinear chaotic map was introduced into the learning algorithm of neural network parameters in order to realizing the weight regulation. The weight of the network was modified to create a reasonable multistep predictive model. Control law was modified by the deviation between the multistep predictive outputs sequence of the network and the set point sequence of the system. Simulation results show that the proposed method is effective.
Related Articles | Metrics

Dynamic Computer Forensics System Based on Data Mining and Multi-Agent
L Ai-li, WEI Hai-ping, YE Xiao-tao
2008, 28 (1): 62-65.
Abstract ( ) PDF ( 288KB ) ( ) 　　
Some association technologies were studied. A design model to the computer dynamic forensics system was put forward, and the detail design to the modules was given. According to the features of dynamic forensics, the method of applying data mining and multi-agent into the dynamic forensics, using multi-agent to build the architecture, using data mining technology to analyze the magnanimous data was raised. However, basic mining algorithms cannot be used to analyze digital evidence directly. So, relative improvements of basic algorithms and methods of pattern analysis were put forward, and experiment is performed to prove the feasibility.
Related Articles | Metrics

Memory Consumption Studying of Aho-Corasick Algorithm in Intrusion Detection
ZHANG Xue-song, TIAN Hong
2008, 28 (1): 66-69.
Abstract ( ) PDF ( 391KB ) ( ) 　　
Multi-pattern matching algorithm is widely used in network intrusion detection system. At present, the research is mostly focused on how to improve the algorithm's matching speed but pays little attention to the memory consumption. It is a valuable problem to degrade the multi-pattern matching algorithm's memory consumption for embedded IDS based on hardware implementation. Aho-Corasick algorithm is based on finite state machine and has O(n) time complexity. Since the algorithm needs large memory to store the state table, it has great difficulty to be applied to memory restrained intrusion detection system. The Aho-Corasick algorithm's memory consumption and several feasible AC FSM storage strategies were deeply discussed. Finally an improved FSM storage strategy was present. The experiment shows that the strategy can effectively degrade the AC algorithm's memory consumption and has little affects on matching speed.
Related Articles | Metrics

Evaluate the Convolution Integral and Convolution Sum Use Compact Formula
MA Tie, YU De-yong, TONG He
2008, 28 (1): 70-73.
Abstract ( ) PDF ( 188KB ) ( ) 　　
Convolution integral and convolution sum are principal methods in the linear time invariant systems analysis. At present, many text books that have been published in the my home country or foreign country, especially the Signals and Systems writing by Oppenheim A V and Signals and Systems writing by Haykin Simon, introduced the methods by use of the graph to determine the up limit, low limit and the exist interval of the integral or convolution sum. The closed methods that evaluate the convolution integral and convolution sum avoid to determine the up, low limits and the duration of the convolution integral and convolution sum by means of the graph，So that, the convolution integral and convolution sum according to the definition can be evaluated directly.
Related Articles | Metrics

Improved Wavelet Neural Network’s Application in Pipelines Leakage Fault Diagnosis
SHAN Hai-ou
2008, 28 (1): 74-77.
Abstract ( ) PDF ( 213KB ) ( ) 　　
A class of wavelet neural network model with the connections between the input and the output layers in part was proposed. According to the effect extent that input symptom to the output fault, the different weights were given. Therefore the straight correlation between the input and the output layers namely between the symptom and the fault was emphasized, and it is in favor of the stability of the WNN model, at the same time it makes the network has the ability that the rapid convergence and quick and exact fault diagnosis. The application to diagnose the leakage of pipelines is included to demonstrate the effectiveness. 
Related Articles | Metrics

Upper Bound on Sum of the Spectral Radius of a Graph and Its Complement
ZHANG Li-zhuo, SONG Dai-cai
2008, 28 (1): 78-80.
Abstract ( ) PDF ( 202KB ) ( ) 　　
Let G be a simple graph with n vertices and ρ(G) be its spectral radius．Let [AKG-] be the complement [KG*3]graph [KG*3]of [KG*3]G, [KG*3]and ρ([AKG-]) be the spectral radius of [AKG-]．The upper bound on sum of the spectral radius of G and [AKG-] were given, and the upper bound on sum of the spectral radius of G and [AKG-] were given when G be unconnected and [AKG-] be connected .
Related Articles | Metrics

Modify and Generalization on Minkowski Inequality of H-Matrix
LI Yang
2008, 28 (1): 81-85.
Abstract ( ) PDF ( 242KB ) ( ) 　　
First, two mistakes about the Minkowski inequality of [WTHX]H[WTBZ]-matrix were pointed by practical examples and reason of the mistakes was found on a view of theory analysis. On the base, some necessary conditions were improved and Minkowski inequality was further modified by considering [WTHX]H[WTBZ]-matrix properties, using eigenvalues’ distribution, inequality’s calculation and other methods，and the corresponding results were generalized. Second, another important inequality of [WTHX]H[WTBZ]-matrix was also generalized by the analysis of the Minkowski inequality. The modify and generalization not only offer supports to the [WTHX]H[WTBZ]-matrix theory itself, but also do good to development of biology, computers and mathematics and other related fields.
Related Articles | Metrics

The Limit Cycle and Global Stability on Predator- Prey System With Ⅳ Functional Response
ZHANG Jiao, JIANG Feng-li
2008, 28 (1): 86-88.
Abstract ( ) PDF ( 184KB ) ( ) 　　
A type Ⅳ functional response predator-prey system was studied.The existence of global limit cycle was investigated by using qualitative analysis and the ideas of Poincaré-Bendixson theory, and some biological illustrations were given.
Related Articles | Metrics

Simple Algorithm for the Binomial Distribution Moments on the Origin of Higher-Order
LI Jin-qiu
2008, 28 (1): 89-91.
Abstract ( ) PDF ( 151KB ) ( ) 　　
　Conside ring the complexity on calculating the binomial distributio n moments on the origin o f hig her -o rder with definition , Stirling number o f the second kind o f combina to rics w as applied to pro bability .And a method in which Stir ling numbe r of the second kind w as used w as given to so lve this pro blem :EXm = Σm l =0 S(m , l)[ n] l p l .M oreo ver , the method w as tested by an example .
Related Articles | Metrics

Empirical Research on the Impact of Share Ratio in Circulation to Stock Price
REN Meng, CHEN Yu-xin
2008, 28 (1): 92-95.
Abstract ( ) PDF ( 195KB ) ( ) 　　
The stock price is influenced by many factors. The share ratio in circulation, the size of company, per share earnings and net asset value per share were considered as the important indexes which decide the stock price. Feltham-Ohlson model was expanded, and the empirical result indicates that the share ratio in circulation effects on the stock price negatively and the other three indexes also influence the price largely. In the implementing moment of the reform of dual-class equity structure, the impact of the share ratio in circulation to stock price, to provide reference for the listed companies to make their financial policies was studied, for the investors to make their reasonable decisions, for the short-term investors to make sensible choice from the aspect of negotiability.
Related Articles | Metrics

Empirical Research on the Top Manager’s Incentive and Performance of Listed Enterprises After the Reforms of Split Share Structure
HU Tie-jun， GUAN Ming-kun， LI Yan-bin
2008, 28 (1): 96-98.
Abstract ( ) PDF ( 167KB ) ( ) 　　
Based on the sample of 51 listed enterprises which finished split share reform, the effect on the top manager’s incentive and performance of listed enterprises was investigated, which utilizes factor analysis method to synthesize ROE，ROA，EPS，IPOS，IROE as performance of listed enterprises' scores and uses regression analysis to verify the relationship between the top manager’s incentive and performance of listed enterprises by SPSS15.0 statistics analysis software. The results show that the reform of split share structure improves the structure of company, the top manager's incentive mechanism takes active effect and improves performance of listed enterprises. The effect of share incentive is better than salary incentive.
Related Articles | Metrics