2014 Vol. 29, No. 5
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2014, 29(5)
:1-5.
doi: 10.3969/j.issn.2095-476X.2014.05.001
Abstract:
Activated carbon was synthesized by using cheap corn stalk as carbon source and ZnCl2 as activator by microwave assisted.Then sulfur-carbon composite materials was synthesized with elemental sulfur by using melting method.The composite was analyzed by surface area and porosity analyzer XRD,FESEM for structure and morphology,and cyclic voltammetry (CV) and charge-discharge curve for electrochemical properties.Results showed that the activated carbon had specific surface area of 1 042.2 m2/g and the total entrance of 0.76 cm3/g.There were pores of different specifications distributed in internal acticated carbon and a large number of pores on activated carbon surface.The sulfur-carbon composite materials were tested when current density at 400 mA/g and scope of charge-discharge in 1.5~3 V,its initial specific discharge capacity was 608.4 mAh/g,and capacity retention was 60% after 100 times,showing good electrochemical performance.
Activated carbon was synthesized by using cheap corn stalk as carbon source and ZnCl2 as activator by microwave assisted.Then sulfur-carbon composite materials was synthesized with elemental sulfur by using melting method.The composite was analyzed by surface area and porosity analyzer XRD,FESEM for structure and morphology,and cyclic voltammetry (CV) and charge-discharge curve for electrochemical properties.Results showed that the activated carbon had specific surface area of 1 042.2 m2/g and the total entrance of 0.76 cm3/g.There were pores of different specifications distributed in internal acticated carbon and a large number of pores on activated carbon surface.The sulfur-carbon composite materials were tested when current density at 400 mA/g and scope of charge-discharge in 1.5~3 V,its initial specific discharge capacity was 608.4 mAh/g,and capacity retention was 60% after 100 times,showing good electrochemical performance.
2014, 29(5)
:6-11.
doi: 10.3969/j.issn.2095-476X.2014.05.002
Abstract:
The polymeric membranes were prepared via spin coating method,which was synthesized with polyvinylidene pluoride(PVDF) as gel,N,N-dimethyl formamide (DMF) as solvent.The micro-morphology of polymer membranes,and conductivity of quasi-solid-state electrolytes and the output current-voltage (I-V) properties of the cells were characterized by scanning electron microscopy (SEM),electrochemical impendance spectroscopy (EIS) and linear sweep voltammetry (LSV).The results showed that the mass ratio of PVDF and DMF,and the rotation rate of spin coating influenced the mesh morphology and the absorbent properties of the polymeric membranes,which influenced the quasi-solid-state electrolyte ionic conductive performance and the photoelectric performance of the DSSCs.When the rotating speed of spin coating machine was fixed at 2500 r/min and the mass ratio of PVDF and DMF was 1 GA6FA 8,the comprehensive performance of DSSCs was better.The open circuit voltage (Voc),short circuit current (Jsc) and conversion efficiency (η) showed the values of 0.726 V,9.96 mA·cm-2 and 3.10%,respectively.
The polymeric membranes were prepared via spin coating method,which was synthesized with polyvinylidene pluoride(PVDF) as gel,N,N-dimethyl formamide (DMF) as solvent.The micro-morphology of polymer membranes,and conductivity of quasi-solid-state electrolytes and the output current-voltage (I-V) properties of the cells were characterized by scanning electron microscopy (SEM),electrochemical impendance spectroscopy (EIS) and linear sweep voltammetry (LSV).The results showed that the mass ratio of PVDF and DMF,and the rotation rate of spin coating influenced the mesh morphology and the absorbent properties of the polymeric membranes,which influenced the quasi-solid-state electrolyte ionic conductive performance and the photoelectric performance of the DSSCs.When the rotating speed of spin coating machine was fixed at 2500 r/min and the mass ratio of PVDF and DMF was 1 GA6FA 8,the comprehensive performance of DSSCs was better.The open circuit voltage (Voc),short circuit current (Jsc) and conversion efficiency (η) showed the values of 0.726 V,9.96 mA·cm-2 and 3.10%,respectively.
2014, 29(5)
:12-16.
doi: 10.3969/j.issn.2095-476X.2014.05.003
Abstract:
Asymmetrical dicationic ionic liquid 1-(1-pyridinium-1-yl) pentane-(1-methylpiperidinium) bi[bis(trifluoromethanesulfonyl)imide] ([PyC5Pi][NTf2]2) was prepared through molecular design theory, and its structure was characterized with IR and 1H NMR.The thermal stability, thermal decomposition kinetic parameters and thermal decomposition mechanism model function of the ionic liquid were studied by using non-isothermal thermogravimetric analysis method, equal-transition ratio method and multivariate non-linear-regression method.The results showed that the thermal stability of the[PyC5Pi][NTf2]2 was better.According to equal-transition ratio method, the average activation energy and average pre-exponential factor of[PyC5Pi][NTf2]2 were 160.10 kJ/mol and 9.17 respectively.Multivariate non-linear-regression method indicated that the ionic liquid was n-tier autocatalytic reaction(CnB),n=1.592 6, Kcat=5.602 7, corresponding to the thermal decomposition mechanism model function f(α)=(1-α)1.592 6(1+5.602 7α),E=169.71 kJ·mol-1, lg A=9.59, respectively.The results were consistent with that of equal-transition ratio method.
Asymmetrical dicationic ionic liquid 1-(1-pyridinium-1-yl) pentane-(1-methylpiperidinium) bi[bis(trifluoromethanesulfonyl)imide] ([PyC5Pi][NTf2]2) was prepared through molecular design theory, and its structure was characterized with IR and 1H NMR.The thermal stability, thermal decomposition kinetic parameters and thermal decomposition mechanism model function of the ionic liquid were studied by using non-isothermal thermogravimetric analysis method, equal-transition ratio method and multivariate non-linear-regression method.The results showed that the thermal stability of the[PyC5Pi][NTf2]2 was better.According to equal-transition ratio method, the average activation energy and average pre-exponential factor of[PyC5Pi][NTf2]2 were 160.10 kJ/mol and 9.17 respectively.Multivariate non-linear-regression method indicated that the ionic liquid was n-tier autocatalytic reaction(CnB),n=1.592 6, Kcat=5.602 7, corresponding to the thermal decomposition mechanism model function f(α)=(1-α)1.592 6(1+5.602 7α),E=169.71 kJ·mol-1, lg A=9.59, respectively.The results were consistent with that of equal-transition ratio method.
2014, 29(5)
:17-22.
doi: 10.3969/j.issn.2095-476X.2014.05.004
Abstract:
Recent advances in Pickering emulsion stabilized by solid particles and Pickering emulsion polymerization were reviewed.It pointed out that the main stability theories of Pickering emulsion were the interface theory and the contact angle theory.The influence factors of Pickering emulsion included solid particle concentration, pH value and the type of electrolyte, etc.SiO2, Laponite and magnetite had been commonly used as solid stabilizers in Pickering emulsion polymerization.The shortages on Pickering emulsion research were also pointed out, such as neglecting the influence of electrical properties of solid particles and deficient research on lamellar colloidal particles as Pickering emulsion stabilizer.Preparing the new Pickering emulsion less affected by monomer with stable properties,so as to enrich Pickering emulsion and its joint technology will be the research focus in the future.
Recent advances in Pickering emulsion stabilized by solid particles and Pickering emulsion polymerization were reviewed.It pointed out that the main stability theories of Pickering emulsion were the interface theory and the contact angle theory.The influence factors of Pickering emulsion included solid particle concentration, pH value and the type of electrolyte, etc.SiO2, Laponite and magnetite had been commonly used as solid stabilizers in Pickering emulsion polymerization.The shortages on Pickering emulsion research were also pointed out, such as neglecting the influence of electrical properties of solid particles and deficient research on lamellar colloidal particles as Pickering emulsion stabilizer.Preparing the new Pickering emulsion less affected by monomer with stable properties,so as to enrich Pickering emulsion and its joint technology will be the research focus in the future.
2014, 29(5)
:23-27.
doi: 10.3969/j.issn.2095-476X.2014.05.005
Abstract:
Throughout research on graphene base/Au nano-composites at home and abroad, the main preparation methods were divided into liquid phase method and solid phase method。Among them, the liquid chemical reduction method wherewith simpleness and efficiency were adopted by the researchers.In biosensor application aspect, graphene base/Au nanoparticle composites were used for detection of heavy metal ions and the target protein, etc.How to prepare in large scale high quality graphene with controllable structure, thickness and size, effectively control the size of nanoparticles thereby so as to enhance the dispersion uniformity of nanoparticles on graphene sheets, and expand the application area of the graphene/Au nano-composites in biosensor are the urgent issues.
Throughout research on graphene base/Au nano-composites at home and abroad, the main preparation methods were divided into liquid phase method and solid phase method。Among them, the liquid chemical reduction method wherewith simpleness and efficiency were adopted by the researchers.In biosensor application aspect, graphene base/Au nanoparticle composites were used for detection of heavy metal ions and the target protein, etc.How to prepare in large scale high quality graphene with controllable structure, thickness and size, effectively control the size of nanoparticles thereby so as to enhance the dispersion uniformity of nanoparticles on graphene sheets, and expand the application area of the graphene/Au nano-composites in biosensor are the urgent issues.
2014, 29(5)
:28-31.
doi: 10.3969/j.issn.2095-476X.2014.05.006
Abstract:
To explore the relationship between physical properties and chemical components about flue-cured tobacco,six physical properties and seven normal chemical components of 92 flue-cured tobacco samples were detected and these data were analyzed by simple correlation analysis, canonical correlation analysis and path analysis.The results showed as follows:1) value had significant negative correlation with total sugar and reducing sugar filling,and had significant extremely positive correlation with total nitrogen and chlorine;leaf thickness had significant extremely positive correlation with total alkaloid, total nitrogen and chlorine;had significant negative correlation with total sugar and reducing sugar;leaf density had significant extremely positive correlation with total alkaloid and total nitrogen, had significant extremely negative correlation with total sugar and reducing sugar;chlorine had extremely or significant extremely negative correlation with reducing sugar and smoldering time;tensile strength had extremely or significant negative correlation with total alkaloid, total nitrogen and chlorine, had significant extremely positive correlation with total sugar;equilibrium moisture content had significant extremely positive correlation with total sugar, had significant extremely positive correlation total alkaloid and reducing sugar.The results of canonical correlation analysis was consistent with the simple correlation analysis,and the canonical correlation coefficients of three pairs of canonical variables were 0.817, 0.538, 0.524 respectively.2) Total sugar, total alkaloid, reducing sugar, total nitrogen and chloride were closely related potassium and starch less with physical characteristics in routine chemical components.
To explore the relationship between physical properties and chemical components about flue-cured tobacco,six physical properties and seven normal chemical components of 92 flue-cured tobacco samples were detected and these data were analyzed by simple correlation analysis, canonical correlation analysis and path analysis.The results showed as follows:1) value had significant negative correlation with total sugar and reducing sugar filling,and had significant extremely positive correlation with total nitrogen and chlorine;leaf thickness had significant extremely positive correlation with total alkaloid, total nitrogen and chlorine;had significant negative correlation with total sugar and reducing sugar;leaf density had significant extremely positive correlation with total alkaloid and total nitrogen, had significant extremely negative correlation with total sugar and reducing sugar;chlorine had extremely or significant extremely negative correlation with reducing sugar and smoldering time;tensile strength had extremely or significant negative correlation with total alkaloid, total nitrogen and chlorine, had significant extremely positive correlation with total sugar;equilibrium moisture content had significant extremely positive correlation with total sugar, had significant extremely positive correlation total alkaloid and reducing sugar.The results of canonical correlation analysis was consistent with the simple correlation analysis,and the canonical correlation coefficients of three pairs of canonical variables were 0.817, 0.538, 0.524 respectively.2) Total sugar, total alkaloid, reducing sugar, total nitrogen and chloride were closely related potassium and starch less with physical characteristics in routine chemical components.
2014, 29(5)
:32-34,38.
doi: 10.3969/j.issn.2095-476X.2014.05.007
Abstract:
Absorption ability of nine flue-cured tobacco varieties to six heavy metals of Cu,Pb,Cd,Cr,As and Hg was studied.The results showed that flue-cured tobacco varieties differed greatly in the absorption ability to the six heavy metals.Heavy metals could be divided into three categories according to the absorption ability of flue-cured tobacco varieties to the six heavy metals.The first class,Cd,was enriched strongly by flue-cured tobacco varieties,the average enrichment factor was 3.751.The second class,Hg,was enriched as a medium level by flue-cured tobacco varieties,the average enrichment factor was 0.735.The third class,including Cu, Pb,As and Cr,was enriched weakly,the average enrichment factor was 0.066.
Absorption ability of nine flue-cured tobacco varieties to six heavy metals of Cu,Pb,Cd,Cr,As and Hg was studied.The results showed that flue-cured tobacco varieties differed greatly in the absorption ability to the six heavy metals.Heavy metals could be divided into three categories according to the absorption ability of flue-cured tobacco varieties to the six heavy metals.The first class,Cd,was enriched strongly by flue-cured tobacco varieties,the average enrichment factor was 3.751.The second class,Hg,was enriched as a medium level by flue-cured tobacco varieties,the average enrichment factor was 0.735.The third class,including Cu, Pb,As and Cr,was enriched weakly,the average enrichment factor was 0.066.
2014, 29(5)
:35-38.
doi: 10.3969/j.issn.2095-476X.2014.05.008
Abstract:
For the same brand of cigarette products,the differences of smoke indexes between the batch of different formulations and the batch of production and the source of the main factors which influenced the stability of smoke indexes were studied by the use of methods of coefficient of variation analysis,variance analysis,multiple comparison analysis.The results showed that the degree of difference among some indexes of production batch was greater than the formulation batch.The most obvious index was the content of smoke nicotine.It indicated that the main factors affecting the stability came from the process of manufacture,including fluctuations in raw material and processing quality among the different production batches.Research methods and results could provide guidance for the critical factor affecting the stability of cigarette smoke indexes.
For the same brand of cigarette products,the differences of smoke indexes between the batch of different formulations and the batch of production and the source of the main factors which influenced the stability of smoke indexes were studied by the use of methods of coefficient of variation analysis,variance analysis,multiple comparison analysis.The results showed that the degree of difference among some indexes of production batch was greater than the formulation batch.The most obvious index was the content of smoke nicotine.It indicated that the main factors affecting the stability came from the process of manufacture,including fluctuations in raw material and processing quality among the different production batches.Research methods and results could provide guidance for the critical factor affecting the stability of cigarette smoke indexes.
2014, 29(5)
:39-43.
doi: 10.3969/j.issn.2095-476X.2014.05.009
Abstract:
The effects of design parameters of cigarette paper on release amount of ammonia and tar content in mainstream smoke were studied,and the release amount of particle phase NH3,release amount of gas phase NH3 of the same cigarette with different cigarette paper parameters were compared.The results indicated that the tar content and release amount of ammonia in cigarette mainstream smoke had a significant positive correlation,and the change of cigarette paper parameters could reduce release amount of ammonia and tar content in mainstream smoke;improved the permeability,the amount of the burning conditioner and potassium content ratio of cigarette paper,to some extent,selectively reduce release amount of particle phase NH3 in cigarette mainstream smoke.
The effects of design parameters of cigarette paper on release amount of ammonia and tar content in mainstream smoke were studied,and the release amount of particle phase NH3,release amount of gas phase NH3 of the same cigarette with different cigarette paper parameters were compared.The results indicated that the tar content and release amount of ammonia in cigarette mainstream smoke had a significant positive correlation,and the change of cigarette paper parameters could reduce release amount of ammonia and tar content in mainstream smoke;improved the permeability,the amount of the burning conditioner and potassium content ratio of cigarette paper,to some extent,selectively reduce release amount of particle phase NH3 in cigarette mainstream smoke.
2014, 29(5)
:44-46.
doi: 10.3969/j.issn.2095-476X.2014.05.010
Abstract:
A method of gas chromatography mass spectrometry was established, which could accurately analysze the amount of benzene, toluene and ethyl benzene in the pyrolysis products of cigarette lap adhesive samples.The parameters of pyrolysis temperature, moisture, dryness temperature and dryness time were optimized.The results showed that the linear possessed good in the range of 2~500 μg/mL, the linear correlation coefficients were above 0.990 0, the limits of detection were from 0.378 ng/mL to 0.996 ng/mL, the limits of quantification were from 1.26 ng/mL to 3.32 ng/mL.The method was suitable for determining the benzenes in cigarette lap adhesive samples.The determined concentration range of benzene was 138.7~188.4 mg/g, toluene was 44.0~75.2 mg/g and ethyl benzene was 3.0~19.1 mg/g in the pyrolysis products of cigarette lap adhesive samples.
A method of gas chromatography mass spectrometry was established, which could accurately analysze the amount of benzene, toluene and ethyl benzene in the pyrolysis products of cigarette lap adhesive samples.The parameters of pyrolysis temperature, moisture, dryness temperature and dryness time were optimized.The results showed that the linear possessed good in the range of 2~500 μg/mL, the linear correlation coefficients were above 0.990 0, the limits of detection were from 0.378 ng/mL to 0.996 ng/mL, the limits of quantification were from 1.26 ng/mL to 3.32 ng/mL.The method was suitable for determining the benzenes in cigarette lap adhesive samples.The determined concentration range of benzene was 138.7~188.4 mg/g, toluene was 44.0~75.2 mg/g and ethyl benzene was 3.0~19.1 mg/g in the pyrolysis products of cigarette lap adhesive samples.
2014, 29(5)
:47-51.
doi: 10.3969/j.issn.2095-476X.2014.05.011
Abstract:
Structure improvement of ribbon guide rail of ZJ17 rolling and connecting unit Aiming at the problems of ribbon guide rail of ZJ17 rolling and connecting unit in the operation process such as the tobacco leakage, running into wavy of suction ribbon, under the premise of guaranteeing the original job requirements and accuracy, the ribbon side guide structure, the distance between the two-side conducting bar, the contact area between the ribbon and guide were improved in technology, and the two sides between ceramic roller wheel was replaced by guide bar on the alloy liner.On the premise of guaranteeing the suction ribbon area, the contract area between the ribbon and the guide was increased.The short rate of cigarette has increased to 0.08%-0.12%;The short-term standard deviation weight of cigarette has reduced to 11.4 mg;The long-term standard deviation weight of cigarette has reduced to 4.2mg.The ribbon running stability and reliability was improved, the probability of tobacco leakage rate was reduced so as to reduce the equipment of tobacco consumption and improve the efficiency of the equipment operation.
Structure improvement of ribbon guide rail of ZJ17 rolling and connecting unit Aiming at the problems of ribbon guide rail of ZJ17 rolling and connecting unit in the operation process such as the tobacco leakage, running into wavy of suction ribbon, under the premise of guaranteeing the original job requirements and accuracy, the ribbon side guide structure, the distance between the two-side conducting bar, the contact area between the ribbon and guide were improved in technology, and the two sides between ceramic roller wheel was replaced by guide bar on the alloy liner.On the premise of guaranteeing the suction ribbon area, the contract area between the ribbon and the guide was increased.The short rate of cigarette has increased to 0.08%-0.12%;The short-term standard deviation weight of cigarette has reduced to 11.4 mg;The long-term standard deviation weight of cigarette has reduced to 4.2mg.The ribbon running stability and reliability was improved, the probability of tobacco leakage rate was reduced so as to reduce the equipment of tobacco consumption and improve the efficiency of the equipment operation.
2014, 29(5)
:52-55.
doi: 10.3969/j.issn.2095-476X.2014.05.012
Abstract:
Aiming at the problem of security and privacy in RFID tag ownership transfer,particularly the owner's authorization recovery problem,a RFID tag ownership transfer protocol based on an optional model was proposed.The protocol used the reader's password to encrypt information,and strengthen the certificate protection of label information.After releasing the ownership,the original owner could choose whether to apply for reinstate authorization.If the application was successful,it could allow it to release the ownership after it finished the use of label information within the specified time to protect the security of privacy.The results showed that the protocol improved the security and flexibility of the tag ownership transfer,algorithm performance also had certain advantage.
Aiming at the problem of security and privacy in RFID tag ownership transfer,particularly the owner's authorization recovery problem,a RFID tag ownership transfer protocol based on an optional model was proposed.The protocol used the reader's password to encrypt information,and strengthen the certificate protection of label information.After releasing the ownership,the original owner could choose whether to apply for reinstate authorization.If the application was successful,it could allow it to release the ownership after it finished the use of label information within the specified time to protect the security of privacy.The results showed that the protocol improved the security and flexibility of the tag ownership transfer,algorithm performance also had certain advantage.
2014, 29(5)
:56-59,67.
doi: 10.3969/j.issn.2095-476X.2014.05.013
Abstract:
By analyzing the process of writing and compiling a simple GRUB 2 module source code,and loading,running,unloading a module,the article described the structure and the process of developing of GRUB 2 module,and clarified the modular design of GRUB 2:it put functions into many small modules,and those modules could be dynamically loaded and unloaded.The analysis showed that GRUB 2 could be redeveloped to consummate its functions and extend its application occasions.
By analyzing the process of writing and compiling a simple GRUB 2 module source code,and loading,running,unloading a module,the article described the structure and the process of developing of GRUB 2 module,and clarified the modular design of GRUB 2:it put functions into many small modules,and those modules could be dynamically loaded and unloaded.The analysis showed that GRUB 2 could be redeveloped to consummate its functions and extend its application occasions.
2014, 29(5)
:60-63.
doi: 10.3969/j.issn.2095-476X.2014.05.014
Abstract:
Aiming at the problem of mass data storage and processing, a cloud storage system based on Hadoop was designed.The system established a cloud storage model on the basis of studying the two core technologies of Hadoop including Hadoop distributed file system and programming model MapReduce.The system optimized the computer storage mode,and increased the efficiency of the network bandwidth and disk in the cluster.At the same time,the MapReduce programming framework design made the system have higher performance of computing ability.Through testing and analysis of Hadoop platform using Linux cluster technology, the results showed that the system had the characteristics of low cost, high efficiency, easy extension, safty and reliability, and could meet the requirement of the mass data processing stably and efficiently.
Aiming at the problem of mass data storage and processing, a cloud storage system based on Hadoop was designed.The system established a cloud storage model on the basis of studying the two core technologies of Hadoop including Hadoop distributed file system and programming model MapReduce.The system optimized the computer storage mode,and increased the efficiency of the network bandwidth and disk in the cluster.At the same time,the MapReduce programming framework design made the system have higher performance of computing ability.Through testing and analysis of Hadoop platform using Linux cluster technology, the results showed that the system had the characteristics of low cost, high efficiency, easy extension, safty and reliability, and could meet the requirement of the mass data processing stably and efficiently.
2014, 29(5)
:64-67.
doi: 10.3969/j.issn.2095-476X.2014.05.015
Abstract:
Aiming at the failure to access to transit information problem that affects the accuracy of the data and limits the processing speed of transport business and the scope of use in logistics management in transit, a logistics management system in transit based on RFID technology was designed.The system which adopted RFID technology to integrate cloud storage technology and GPRS technology made contactless automatic identification to the long-range and high-speed mobile goal.It also could track transit product "existence" which could provide a more complete process data record,and make the head of the household keep track of products in transit state.The application practice showed that the system could effectively solve the problems of small and medium-sized logistics enterprises and had the characteristics of low cost and easy operation.
Aiming at the failure to access to transit information problem that affects the accuracy of the data and limits the processing speed of transport business and the scope of use in logistics management in transit, a logistics management system in transit based on RFID technology was designed.The system which adopted RFID technology to integrate cloud storage technology and GPRS technology made contactless automatic identification to the long-range and high-speed mobile goal.It also could track transit product "existence" which could provide a more complete process data record,and make the head of the household keep track of products in transit state.The application practice showed that the system could effectively solve the problems of small and medium-sized logistics enterprises and had the characteristics of low cost and easy operation.
2014, 29(5)
:68-73,77.
doi: 10.3969/j.issn.2095-476X.2014.05.016
Abstract:
Aiming at the decentralized adaptive stabilization problem for a class of stochastic nonlinear interconnected systems with unknown virtual control coefficients under bounded disturbance,different from the traditional centralized control,by adopting the idea of decentralized control,the controller for each subsystem was designed.By employing the backstepping design technique and stochastic LaSalle theorem,decentralized state-feedback adaptive controller was designed to guarantee that the equilibrium of the close-loop system was bounded in probability.Finally,simulation examples verified the effectiveness of the proposed control strategy.
Aiming at the decentralized adaptive stabilization problem for a class of stochastic nonlinear interconnected systems with unknown virtual control coefficients under bounded disturbance,different from the traditional centralized control,by adopting the idea of decentralized control,the controller for each subsystem was designed.By employing the backstepping design technique and stochastic LaSalle theorem,decentralized state-feedback adaptive controller was designed to guarantee that the equilibrium of the close-loop system was bounded in probability.Finally,simulation examples verified the effectiveness of the proposed control strategy.
2014, 29(5)
:74-77.
doi: 10.3969/j.issn.2095-476X.2014.05.017
Abstract:
According to the damp and low temperature environment in tunnel,a electronic refrigeration temperature and humidity control system based on STC12C5A32S2 was designed and realized.It detected the temperature and humidity algorithm after a certain time and added integrators to ensure the stability and the accuracy of the data.The feedback control technology was also used to make the controling temperature and humidity to the normal range in short time.Testing results showed that the system could meet the requirements of harsh environment in the tunnel,and have stable running and good performance.
According to the damp and low temperature environment in tunnel,a electronic refrigeration temperature and humidity control system based on STC12C5A32S2 was designed and realized.It detected the temperature and humidity algorithm after a certain time and added integrators to ensure the stability and the accuracy of the data.The feedback control technology was also used to make the controling temperature and humidity to the normal range in short time.Testing results showed that the system could meet the requirements of harsh environment in the tunnel,and have stable running and good performance.
2014, 29(5)
:78-82.
doi: 10.3969/j.issn.2095-476X.2014.05.018
Abstract:
Kalman filtering requires the calculation of Jacobian matrix in integrated navigation,when the model is too complex or Jacobian matrix cannot be obtained it is difficult to deal with the issue,the UKF sequential filtering method was proposed.To solve these problems,the method used the UKF filter, the GPS information and navigation information,successively using new information to make correction estimates.The method was used in ship navigation,and the simulation results proved the effectiveness of the algorithm.
Kalman filtering requires the calculation of Jacobian matrix in integrated navigation,when the model is too complex or Jacobian matrix cannot be obtained it is difficult to deal with the issue,the UKF sequential filtering method was proposed.To solve these problems,the method used the UKF filter, the GPS information and navigation information,successively using new information to make correction estimates.The method was used in ship navigation,and the simulation results proved the effectiveness of the algorithm.
2014, 29(5)
:83-88.
doi: 10.3969/j.issn.2095-476X.2014.05.019
Abstract:
In rapid design system of tower crane, the parametric design of entire jib was done based on the parameterization of single jib.According to some requirements of the jibs' length change, the jib design of tower crane with the characteristic of variable arms was performed, which could realize the design of automatic assembly.Through an example, the methods including automatic calculation of pull rods' lengths and parametric design, etc.were given.Implementation of the jib parametric design lays the foundation for the rapid design of tower crane.
In rapid design system of tower crane, the parametric design of entire jib was done based on the parameterization of single jib.According to some requirements of the jibs' length change, the jib design of tower crane with the characteristic of variable arms was performed, which could realize the design of automatic assembly.Through an example, the methods including automatic calculation of pull rods' lengths and parametric design, etc.were given.Implementation of the jib parametric design lays the foundation for the rapid design of tower crane.
2014, 29(5)
:89-93.
doi: 10.3969/j.issn.2095-476X.2014.05.020
Abstract:
Taking a compressor blade as subject,the mathematical model of a compressor blade was established to ensure that it would not distort when it was modeled.With the UG NX secondary development and C++,the compressor blade was optimized to obtain the lightest structure that can satisfy the strength and vibration,based on the finite element analysis.The results showed that the compressor blade was modeled without error in the iterative process.And the optimal volume (mass) of the axial compressor blade was reduced by 6.680% than origin which could satisfied the work requirement that the original structure didn't.The total method of the structural optimization was effective and feasible and could be used in the design process of other mechanical products.
Taking a compressor blade as subject,the mathematical model of a compressor blade was established to ensure that it would not distort when it was modeled.With the UG NX secondary development and C++,the compressor blade was optimized to obtain the lightest structure that can satisfy the strength and vibration,based on the finite element analysis.The results showed that the compressor blade was modeled without error in the iterative process.And the optimal volume (mass) of the axial compressor blade was reduced by 6.680% than origin which could satisfied the work requirement that the original structure didn't.The total method of the structural optimization was effective and feasible and could be used in the design process of other mechanical products.
2014, 29(5)
:94-97.
doi: 10.3969/j.issn.2095-476X.2014.05.021
Abstract:
By the UG secondary development tools UG/OPEN API and NX OPEN C++, and the integrated use of the C programming language, fan blade model, finite element model, simulation were created model parameterization on VS2008 platform.The measure of acguiring the information about the fan blade thickness information was also studied.The shell thickness of unit was loaded to mak it a solid shell element with physical properties.Solid shell element was used to mesh the fan blade in simulation analysis.Under the same calculation model, compared solid element and solid shell element analysis results, the solid shell element could effectively reduce computing scale(24.65%) and calculation time(45.97%) so it improved the computing efficiency,and reduced the computing time.
By the UG secondary development tools UG/OPEN API and NX OPEN C++, and the integrated use of the C programming language, fan blade model, finite element model, simulation were created model parameterization on VS2008 platform.The measure of acguiring the information about the fan blade thickness information was also studied.The shell thickness of unit was loaded to mak it a solid shell element with physical properties.Solid shell element was used to mesh the fan blade in simulation analysis.Under the same calculation model, compared solid element and solid shell element analysis results, the solid shell element could effectively reduce computing scale(24.65%) and calculation time(45.97%) so it improved the computing efficiency,and reduced the computing time.
2014, 29(5)
:98-102.
doi: 10.3969/j.issn.2095-476X.2014.05.022
Abstract:
Upon quantum mechanics,the equililibrium geometry of H2,HS+ and H2S+ had been calculated on the computational levels of density functional theory(DFT) B3P86,B3LYP and QCISD.The possible electronic state and reasonable dissociation limit for the ground state of H2,HS+ and H2S+ molecule or ions were determined based on atomic and molecular reaction statics,and Murrell-Sorbie analytic potential energy function of H2 and HS+ molecule or ions had been derived through the least-square fitting to ab initio data.Similarly,the harmonic frequency had been calculated,and the analytic potential energy function of H2S+ ions had been derived using many-body expansion theory.
Upon quantum mechanics,the equililibrium geometry of H2,HS+ and H2S+ had been calculated on the computational levels of density functional theory(DFT) B3P86,B3LYP and QCISD.The possible electronic state and reasonable dissociation limit for the ground state of H2,HS+ and H2S+ molecule or ions were determined based on atomic and molecular reaction statics,and Murrell-Sorbie analytic potential energy function of H2 and HS+ molecule or ions had been derived through the least-square fitting to ab initio data.Similarly,the harmonic frequency had been calculated,and the analytic potential energy function of H2S+ ions had been derived using many-body expansion theory.
2014, 29(5)
:103-105.
doi: 10.3969/j.issn.2095-476X.2014.05.023
Abstract:
The problem of generalized synchronization between two networks with different nodes and different topologican structures was investigated.Based on the drive-response strategy,one of the networks was controlled,and the synchronization criterion was given via stability theory.The numerical example could be applied to supply chain network,energy supply and demand network,traffic network and so on.
The problem of generalized synchronization between two networks with different nodes and different topologican structures was investigated.Based on the drive-response strategy,one of the networks was controlled,and the synchronization criterion was given via stability theory.The numerical example could be applied to supply chain network,energy supply and demand network,traffic network and so on.
2014, 29(5)
:106-108.
doi: 10.3969/j.issn.2095-476X.2014.05.024
Abstract:
By index input and standard incidence rate,an epidemic model of tuberculosis repeated infection with inoculation disease was established.The disease-free equilibrium was obtained,and the disease-free equilibrium point of the local and global stability was studied.Numerical simulation results further verified the correctness of theoretical results.
By index input and standard incidence rate,an epidemic model of tuberculosis repeated infection with inoculation disease was established.The disease-free equilibrium was obtained,and the disease-free equilibrium point of the local and global stability was studied.Numerical simulation results further verified the correctness of theoretical results.
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Editor-in-chief：Wei Shizhong
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Edited & published by：Editorial Department of Journal of Light Industry
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