2012 Vol. 27, No. 2
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2012, 27(2)
:1-4,21.
doi: 10.3969/j.issn.1004-1478.2012.02.001
Abstract:
Fe3O4-chitosan magnetic microspheres were prepared by modifying carboxyl Fe3O4 nanoparticle with chitosan.The resulted samples were characterized by X-ray diffraction,scanning electron microscope and thermogravimetry.The adsorption amounts of Cu2+ were detected with an atomic absorption spectroscopy.In addition,the effect of parameters such as contact time,pH and Cu2+ initial concentration on the adsorption capacities was also discussed.The results have showed that Fe3O4-chitosan magnetic microspheres have a narrow size distribution with a mean diameter of 110 nm.Fe3O4-chitosan magnetic microspheres are able to adsorb Cu2+,and the maximum absorption quantity can reach 21.3 mg/g.With the increase of adsorbent dosage and temperature,the unit adsorption capacity decreased and the adsorption was better at room temperature.The adsorption of the magnetic microspheres is greatly influenced by the factors of initial concentration of Cu2+ and pH value,and the adsorption capacity was higher at 120 mg/L, and 5.0
Fe3O4-chitosan magnetic microspheres were prepared by modifying carboxyl Fe3O4 nanoparticle with chitosan.The resulted samples were characterized by X-ray diffraction,scanning electron microscope and thermogravimetry.The adsorption amounts of Cu2+ were detected with an atomic absorption spectroscopy.In addition,the effect of parameters such as contact time,pH and Cu2+ initial concentration on the adsorption capacities was also discussed.The results have showed that Fe3O4-chitosan magnetic microspheres have a narrow size distribution with a mean diameter of 110 nm.Fe3O4-chitosan magnetic microspheres are able to adsorb Cu2+,and the maximum absorption quantity can reach 21.3 mg/g.With the increase of adsorbent dosage and temperature,the unit adsorption capacity decreased and the adsorption was better at room temperature.The adsorption of the magnetic microspheres is greatly influenced by the factors of initial concentration of Cu2+ and pH value,and the adsorption capacity was higher at 120 mg/L, and 5.0
2012, 27(2)
:5-8,49.
doi: 10.3969/j.issn.1004-1478.2012.02.002
Abstract:
A new type of borophosphate compound NaZnB3P2O10(OH)2·1.17H2O was synthesized by a cryogenic molten-salt method,and characterized by X-ray powder diffraction,thermogravimetry,and infrared spectroscopy.The results indicated that the compound had space group P63/m,a=b=1.172 72(3) nm,c=1.213 17(6) nm, γ=120°,V=1.444 91(10) nm3, and Z=6.In the optimized structure,the boron atom in a distorted BO4 tetrahedron and two BO2(OH) flat-triangle connected component B3O6(OH)2 group,ZnO6 octahedron,and PO4 tetrahedron alternate formed two-dimensional ZnP2O10 layers.NaZnB3P2O10(OH)2·1.17 H2O 3-D mesh structure was formed connecting B3O6(OH)2 group with NaO6 octahedron between layers.
A new type of borophosphate compound NaZnB3P2O10(OH)2·1.17H2O was synthesized by a cryogenic molten-salt method,and characterized by X-ray powder diffraction,thermogravimetry,and infrared spectroscopy.The results indicated that the compound had space group P63/m,a=b=1.172 72(3) nm,c=1.213 17(6) nm, γ=120°,V=1.444 91(10) nm3, and Z=6.In the optimized structure,the boron atom in a distorted BO4 tetrahedron and two BO2(OH) flat-triangle connected component B3O6(OH)2 group,ZnO6 octahedron,and PO4 tetrahedron alternate formed two-dimensional ZnP2O10 layers.NaZnB3P2O10(OH)2·1.17 H2O 3-D mesh structure was formed connecting B3O6(OH)2 group with NaO6 octahedron between layers.
2012, 27(2)
:9-12.
doi: 10.3969/j.issn.1004-1478.2012.02.003
Abstract:
Traditional invasive liquid film measurement method such as conductance probe technique is not suitable for the gas-liquid two-phase flow system with high pressure, flammable,combustible and corrosity medium.A novel method was proposed based on infrared imaging for gas-liquid two phase stratified flow liquid film height measurement.In order to improve the measurement accuracy,a heating belt was applied to improve the temperature difference between the gas and liquid,the film height was obtained using infrared imaging to distinguish gas-liquid interface.A VOF multiphase flow model was used to simulate the temperature distribution of the pipe section under constant heat flux,based on this,the experiments were carried out at an air-water two-phase flow loop and the infrared image were obtained using an infrared camera.The gas-liquid interface position was determined according to the temperature gradient characteristics.The measurement results were compared with capacitance probe method.It showed during the experimental range,the maximum measurement error was 8.2%.
Traditional invasive liquid film measurement method such as conductance probe technique is not suitable for the gas-liquid two-phase flow system with high pressure, flammable,combustible and corrosity medium.A novel method was proposed based on infrared imaging for gas-liquid two phase stratified flow liquid film height measurement.In order to improve the measurement accuracy,a heating belt was applied to improve the temperature difference between the gas and liquid,the film height was obtained using infrared imaging to distinguish gas-liquid interface.A VOF multiphase flow model was used to simulate the temperature distribution of the pipe section under constant heat flux,based on this,the experiments were carried out at an air-water two-phase flow loop and the infrared image were obtained using an infrared camera.The gas-liquid interface position was determined according to the temperature gradient characteristics.The measurement results were compared with capacitance probe method.It showed during the experimental range,the maximum measurement error was 8.2%.
2012, 27(2)
:13-17.
doi: 10.3969/j.issn.1004-1478.2012.02.004
Abstract:
A strain with flocculation activity was screened from return activated sludge from secondary settling tank and was identified as Pseudomoas.The effects of flocculant producing from this strain on kaolin suspension were investigated.The results showed that the flocculation effect on 4.0 g/L kaolin suspension was the best when fermentation liquor pH was 7.0,bioflocculant dosage was 2.5%(V/V),coagulant aid CaCl2 dosage was 1.0 g/L and flocculation rate was 91.6%.The main components were protein,the active components of the flocculant mostly existed in deposition after centrifugation.
A strain with flocculation activity was screened from return activated sludge from secondary settling tank and was identified as Pseudomoas.The effects of flocculant producing from this strain on kaolin suspension were investigated.The results showed that the flocculation effect on 4.0 g/L kaolin suspension was the best when fermentation liquor pH was 7.0,bioflocculant dosage was 2.5%(V/V),coagulant aid CaCl2 dosage was 1.0 g/L and flocculation rate was 91.6%.The main components were protein,the active components of the flocculant mostly existed in deposition after centrifugation.
2012, 27(2)
:18-21.
doi: 10.3969/j.issn.1004-1478.2012.02.005
Abstract:
The cultural condition for Inonotus rickii including carbon source,nitrogen source,temperature and pH was studied and the main chemical ingredients in its mycelia were analyzed.The results showed that corn starch,mannite and glucose were the preferential carbon source,the best was corn starch;sodium nitrate did not suit for production of fungus peptone and dusty yeast was the preferential nitrogen source,the best was peptone.The optimal cultural condition for Inonotus rickii was pH=6.0~6.5 and temperature 25~30℃.The chemical ingredients in its mycelia were amino acids,pdypeptide,protein,organic acid,reducing sugar,polysaccharide,glucoside,sapogenin,steroids,triterpenoid,lactones,coumarin and naphtha and do not include alkaloid,phenols,tannin,flavone,cardiac glycoside and anthraquinone.
The cultural condition for Inonotus rickii including carbon source,nitrogen source,temperature and pH was studied and the main chemical ingredients in its mycelia were analyzed.The results showed that corn starch,mannite and glucose were the preferential carbon source,the best was corn starch;sodium nitrate did not suit for production of fungus peptone and dusty yeast was the preferential nitrogen source,the best was peptone.The optimal cultural condition for Inonotus rickii was pH=6.0~6.5 and temperature 25~30℃.The chemical ingredients in its mycelia were amino acids,pdypeptide,protein,organic acid,reducing sugar,polysaccharide,glucoside,sapogenin,steroids,triterpenoid,lactones,coumarin and naphtha and do not include alkaloid,phenols,tannin,flavone,cardiac glycoside and anthraquinone.
2012, 27(2)
:22-25.
doi: 10.3969/j.issn.1004-1478.2012.02.006
Abstract:
Alcohol production was carried out using saccharification and fermentation of cellulase with cellulose waste as material.The results showed that sugar rate was 36.8% when bagasse was pretreated with 1.0% dilute sulphuric acid at 121℃,heat preservation 2 h and was hydrolyzed with cellulase at condition 50℃,pH=5.0,40 U/g for 120 min.Analysis of test results from the orthogonal experiment showed that the production of Saccharomyces cerevisiae optimum technology condition was fermentation time 72 h,fermentation temperature 28℃,1.00% inoculum,the alcohol yield was 15.31 g/g.Four factors on the yield of the impact of alcohol order were as follows:fermentation time >fermentation temperature > yeast inoculum > cellulase dosage.
Alcohol production was carried out using saccharification and fermentation of cellulase with cellulose waste as material.The results showed that sugar rate was 36.8% when bagasse was pretreated with 1.0% dilute sulphuric acid at 121℃,heat preservation 2 h and was hydrolyzed with cellulase at condition 50℃,pH=5.0,40 U/g for 120 min.Analysis of test results from the orthogonal experiment showed that the production of Saccharomyces cerevisiae optimum technology condition was fermentation time 72 h,fermentation temperature 28℃,1.00% inoculum,the alcohol yield was 15.31 g/g.Four factors on the yield of the impact of alcohol order were as follows:fermentation time >fermentation temperature > yeast inoculum > cellulase dosage.
2012, 27(2)
:26-30.
doi: 10.3969/j.issn.1004-1478.2012.02.007
Abstract:
In order to reduce the content of detrimental material such as tar and CO and improve the quality of cigarettes,the application effect of cigarette paper additives was studied.The results showed that compared with control,the application of additives in cigarette paper can start cracking at lower temperatures,and the initial thermal decomposition temperature of cigarette paper was reduced;by heat treatment,the permeability of cigarette pape adding additives was larger than the control samples;the additives could bring down the CO and the tar,decreasing separately by 14.49% and 8.46%.The sensory evaluation was carried out and results showed that the additives could improve the aroma,harmonization and odor,reduce the stimulus and improve the aftertaste.Safety evaluation of cigarette paper additives was conductded.According to the evaluation of the acute oral toxicity grading standards,cigarette paper additives were practical non-toxic.
In order to reduce the content of detrimental material such as tar and CO and improve the quality of cigarettes,the application effect of cigarette paper additives was studied.The results showed that compared with control,the application of additives in cigarette paper can start cracking at lower temperatures,and the initial thermal decomposition temperature of cigarette paper was reduced;by heat treatment,the permeability of cigarette pape adding additives was larger than the control samples;the additives could bring down the CO and the tar,decreasing separately by 14.49% and 8.46%.The sensory evaluation was carried out and results showed that the additives could improve the aroma,harmonization and odor,reduce the stimulus and improve the aftertaste.Safety evaluation of cigarette paper additives was conductded.According to the evaluation of the acute oral toxicity grading standards,cigarette paper additives were practical non-toxic.
2012, 27(2)
:31-36.
doi: 10.3969/j.issn.1004-1478.2012.02.008
Abstract:
The volatile components of two functional flavors were analyzed by gas chromatograph/mass spectrometer (GC/MS).Changes of sensory qualities and volatile components prior to and after applying functional flavors were identified.The results indicated that the contents of volatile components in tobacco increased after casing;sensory quality of tobacco was enhanced considerably after casing,the change trend as a whole was in keeping with flavor function.The research results may play an important role in casing design of tobacco.
The volatile components of two functional flavors were analyzed by gas chromatograph/mass spectrometer (GC/MS).Changes of sensory qualities and volatile components prior to and after applying functional flavors were identified.The results indicated that the contents of volatile components in tobacco increased after casing;sensory quality of tobacco was enhanced considerably after casing,the change trend as a whole was in keeping with flavor function.The research results may play an important role in casing design of tobacco.
2012, 27(2)
:37-39.
doi: 10.3969/j.issn.1004-1478.2012.02.009
Abstract:
To study the situation of groove filter entrapping volatile components in the mainstream smoke,a method of SDE-GC/MS was set up.And the condition was optimized by orthogonal experiment.The results showed that the number and the content of volatile components in the groove filter was the most and highest when the number of cigarettes and the condition of GC/MS were certain,the condition of SDE was concentration of NaCl 90 g/L,volume of NaCl 400 mL,volume of CH2Cl2 40 mL and extraction time 2.5 h.
To study the situation of groove filter entrapping volatile components in the mainstream smoke,a method of SDE-GC/MS was set up.And the condition was optimized by orthogonal experiment.The results showed that the number and the content of volatile components in the groove filter was the most and highest when the number of cigarettes and the condition of GC/MS were certain,the condition of SDE was concentration of NaCl 90 g/L,volume of NaCl 400 mL,volume of CH2Cl2 40 mL and extraction time 2.5 h.
2012, 27(2)
:40-45.
doi: 10.3969/j.issn.1004-1478.2012.02.010
Abstract:
The research advance of activated carbon application in cigarette fliter was reveiwed from activated carbon property,environment factor and complex use of activated carbon with other adsorbent,its future application direction will be discussed.The research results showed that the physical and chemical surface properties of activated carbon decided it's adsorption capacity for cigarette smoke,and it affected by smoking and storage condition.The complex use of activated carbon with other adsorbent could decrease harmful smoke component.Therefore,the selective removal of cigarette smoke will be thought as the core technology in the utilization of activated carbon in cigarette filters,which could be achieved by changing the physical structres or the surface chemical properties of activated carbon.
The research advance of activated carbon application in cigarette fliter was reveiwed from activated carbon property,environment factor and complex use of activated carbon with other adsorbent,its future application direction will be discussed.The research results showed that the physical and chemical surface properties of activated carbon decided it's adsorption capacity for cigarette smoke,and it affected by smoking and storage condition.The complex use of activated carbon with other adsorbent could decrease harmful smoke component.Therefore,the selective removal of cigarette smoke will be thought as the core technology in the utilization of activated carbon in cigarette filters,which could be achieved by changing the physical structres or the surface chemical properties of activated carbon.
2012, 27(2)
:46-49.
doi: 10.3969/j.issn.1004-1478.2012.02.011
Abstract:
In production process of cigarette filter rod,the common problems include the fluctuation of the stability of quality index such as hardness and pressure drop,and the jam of transmission pipeline due to glue infiltration which would lead to shutdown.The stability of quality index has been improved by using the tow balancing machine,the tow guide roller and new type nozzle;a kind of dredging device has been used to clear the glue dirt existing in transmission pipeline of filter rod.The application results explained that the qualified rate of hardness and pressure drop have been improved from 72.04% to 95.64%,and 92.12% to 95.41% respectively;the shutdown times due to pipeline jam have been reduced from 6.23 per day to 3 per month.
In production process of cigarette filter rod,the common problems include the fluctuation of the stability of quality index such as hardness and pressure drop,and the jam of transmission pipeline due to glue infiltration which would lead to shutdown.The stability of quality index has been improved by using the tow balancing machine,the tow guide roller and new type nozzle;a kind of dredging device has been used to clear the glue dirt existing in transmission pipeline of filter rod.The application results explained that the qualified rate of hardness and pressure drop have been improved from 72.04% to 95.64%,and 92.12% to 95.41% respectively;the shutdown times due to pipeline jam have been reduced from 6.23 per day to 3 per month.
2012, 27(2)
:50-54.
doi: 10.3969/j.issn.1004-1478.2012.02.012
Abstract:
Digital speckle correlation method (DSCM) is introduced to solve the challenging problems such as that the strain is obtained on the time of failure during the traditional experimental process of sheet tensile mechanical properties.The calculations of strain were deduced using DSCM.The corresponding strains along x and y direction were obtained from uniaxial tension experiments.Synchronous detection was carried out application of XJTUDIC speckle measurement equipment,using the VCM deep-drawing multi-layer sheet,VCM non-deep drawing multi-layer sheet and their component material sheets as the targeted experimental objects,respectively.The relationships along both directions of the VCM multi-layer sheet and substrate and clad were analyzed from five kinds of material sample located rolling 45° direction.The results showed that strain of VCM multi-layer sheet was being improved after the file VCM clad was added using the three-dimensional speckle measurement technique.The maximum strains along x direction of VCM non-deep drawing multi-layer sheet and the VCM deep-drawing multi-layer sheet were 68.743% and 48.632%,y direction were -2.657% and -15.381% respectively.The mechanical properties of the VCM multi-layer sheet were between the mechanical properties of the substrate and film.The mechanical properties of the VCM deep-drawing multiple layers sheet was superior to those of the VCM non-deep drawing multi-layer sheet.
Digital speckle correlation method (DSCM) is introduced to solve the challenging problems such as that the strain is obtained on the time of failure during the traditional experimental process of sheet tensile mechanical properties.The calculations of strain were deduced using DSCM.The corresponding strains along x and y direction were obtained from uniaxial tension experiments.Synchronous detection was carried out application of XJTUDIC speckle measurement equipment,using the VCM deep-drawing multi-layer sheet,VCM non-deep drawing multi-layer sheet and their component material sheets as the targeted experimental objects,respectively.The relationships along both directions of the VCM multi-layer sheet and substrate and clad were analyzed from five kinds of material sample located rolling 45° direction.The results showed that strain of VCM multi-layer sheet was being improved after the file VCM clad was added using the three-dimensional speckle measurement technique.The maximum strains along x direction of VCM non-deep drawing multi-layer sheet and the VCM deep-drawing multi-layer sheet were 68.743% and 48.632%,y direction were -2.657% and -15.381% respectively.The mechanical properties of the VCM multi-layer sheet were between the mechanical properties of the substrate and film.The mechanical properties of the VCM deep-drawing multiple layers sheet was superior to those of the VCM non-deep drawing multi-layer sheet.
2012, 27(2)
:55-58.
doi: 10.3969/j.issn.1004-1478.2012.02.013
Abstract:
The calculating modes of crack width of Chinese,American and European concrete codes were compared considering their calculating methods, parameters and precisions according to the previous experimental data of short-term crack width of reinforced concrete flexural members.Based on the comparison and the calculating mode of crack width of Chinese concrete code,the suggested formula for maximum crack width of reinforced concrete flexural members was proposed.The results showed that the calculating values of suggested formula agreed well with the test ones.
The calculating modes of crack width of Chinese,American and European concrete codes were compared considering their calculating methods, parameters and precisions according to the previous experimental data of short-term crack width of reinforced concrete flexural members.Based on the comparison and the calculating mode of crack width of Chinese concrete code,the suggested formula for maximum crack width of reinforced concrete flexural members was proposed.The results showed that the calculating values of suggested formula agreed well with the test ones.
2012, 27(2)
:59-62.
doi: 10.3969/j.issn.1004-1478.2012.02.014
Abstract:
Twelve specimens of externally bonded CFRP (carbon fiber reinforced polymer/plastic) plate were employed to analyze the influences of the bond length,and obtain the curve about the local bond-slip relationship.Based on the test results and theoretical analysis,the conclusions can be obtained as flollows:the debonding between CFRP and wood was gradually developing from the loaded end to the freed end;the bond-slip curve basically has two parts,the rising step as the shape of straight,and the declining step as the shape of hyperbolic curve.A local bond-slip model of fir grain direction with fixed CFRP was proposed by Matlab fitting the test results.The model matches the experimental results well.
Twelve specimens of externally bonded CFRP (carbon fiber reinforced polymer/plastic) plate were employed to analyze the influences of the bond length,and obtain the curve about the local bond-slip relationship.Based on the test results and theoretical analysis,the conclusions can be obtained as flollows:the debonding between CFRP and wood was gradually developing from the loaded end to the freed end;the bond-slip curve basically has two parts,the rising step as the shape of straight,and the declining step as the shape of hyperbolic curve.A local bond-slip model of fir grain direction with fixed CFRP was proposed by Matlab fitting the test results.The model matches the experimental results well.
2012, 27(2)
:63-66.
doi: 10.3969/j.issn.1004-1478.2012.02.015
Abstract:
Using the mechanism motion simulation function of Pro/E software,the electrorheological transmission operation state and the process changes over time were simulated.The simulation system's input and output parameters of the basic characteristics and mutual relations were obtained:in the cases of ignoring the rotation speed difference between active wheel and driven wheel of clutch and friction resistance of system,electrorheological transmission system's power transmission was steady without considering the efficiency factors,speed was not affected by time,input and output torque response time lag slightly,but with the same response time.The system operated normally with no structure interference,and transmission ratio (3,1.5,2) corresponded to design requirements.The feasibility of electrorheological transmission's structure and design data was validated.
Using the mechanism motion simulation function of Pro/E software,the electrorheological transmission operation state and the process changes over time were simulated.The simulation system's input and output parameters of the basic characteristics and mutual relations were obtained:in the cases of ignoring the rotation speed difference between active wheel and driven wheel of clutch and friction resistance of system,electrorheological transmission system's power transmission was steady without considering the efficiency factors,speed was not affected by time,input and output torque response time lag slightly,but with the same response time.The system operated normally with no structure interference,and transmission ratio (3,1.5,2) corresponded to design requirements.The feasibility of electrorheological transmission's structure and design data was validated.
2012, 27(2)
:67-69.
doi: 10.3969/j.issn.1004-1478.2012.02.016
Abstract:
A plan of energy conservation and emission reduction was proposed and designed based on adding solar energy water heating system,heat preservation storage tank and improving automatic control device in the factory coal-fired boilers.The effect of energy saving and emission reduction was investigated by theoretical analysis and experiment of model.The results showed that coal-fired cost savings every year accounted for 9.3% of the total investment,static payback period is 11 a,the proportion of all kinds of pollutants was reduced by approximately 4%.The solar water heating system used in the coal-fired boiler can achieve the desired effect of energy saving and emission reduction.
A plan of energy conservation and emission reduction was proposed and designed based on adding solar energy water heating system,heat preservation storage tank and improving automatic control device in the factory coal-fired boilers.The effect of energy saving and emission reduction was investigated by theoretical analysis and experiment of model.The results showed that coal-fired cost savings every year accounted for 9.3% of the total investment,static payback period is 11 a,the proportion of all kinds of pollutants was reduced by approximately 4%.The solar water heating system used in the coal-fired boiler can achieve the desired effect of energy saving and emission reduction.
2012, 27(2)
:70-72.
doi: 10.3969/j.issn.1004-1478.2012.02.017
Abstract:
Using packte switching time slice concept of computer network protocol,according to network scale and data and setting network specific wake-up time and resting time,the MAC protocol was optimized.Experimental results showed that optimized network had specific fixed delay,low packet loss rate and loger life.
Using packte switching time slice concept of computer network protocol,according to network scale and data and setting network specific wake-up time and resting time,the MAC protocol was optimized.Experimental results showed that optimized network had specific fixed delay,low packet loss rate and loger life.
2012, 27(2)
:73-76.
doi: 10.3969/j.issn.1004-1478.2012.02.018
Abstract:
Aiming at the fact that the current WebGIS technology has many limitations such as only based on page model,the emergency GIS was published based on the RIA (rich Internet application) technology.The interface is broken down into small modules by using RIA in this system.These small units and components can be directly with the user interaction,and communicates with Web server,run only when the update request portion,avoids the system frequently generates entire page.The operation results proved that the emergency GIS system based on the RIA technology had a powerful front-end processing capabilities and high cooperation.It also improved the performance of spatial analysis and the user experience.
Aiming at the fact that the current WebGIS technology has many limitations such as only based on page model,the emergency GIS was published based on the RIA (rich Internet application) technology.The interface is broken down into small modules by using RIA in this system.These small units and components can be directly with the user interaction,and communicates with Web server,run only when the update request portion,avoids the system frequently generates entire page.The operation results proved that the emergency GIS system based on the RIA technology had a powerful front-end processing capabilities and high cooperation.It also improved the performance of spatial analysis and the user experience.
2012, 27(2)
:77-79,90.
doi: 10.3969/j.issn.1004-1478.2012.02.019
Abstract:
Aiming at the insufficient management of collection point when expanding the network scale of the JXTA,a partition-based JXTA network search strategy was proposed through introducing the center collection point,and sorting the RPV table according to the priority of each collection point.The simulation experiment showed that this strategy had made the JXTA network and physical network topology to match,and improved the speed and efficiency of the network query.
Aiming at the insufficient management of collection point when expanding the network scale of the JXTA,a partition-based JXTA network search strategy was proposed through introducing the center collection point,and sorting the RPV table according to the priority of each collection point.The simulation experiment showed that this strategy had made the JXTA network and physical network topology to match,and improved the speed and efficiency of the network query.
2012, 27(2)
:80-83.
doi: 10.3969/j.issn.1004-1478.2012.02.020
Abstract:
Aiming at the problem that traditional item similarity of e-commerce recommedation system has shortage in calculation and the recommedation output of TOP-N lacks personalization,an improvement algorithm was put forword.This algorithm calculates item similarity using dynamic weigh factor method,classifies items using fuzzy clustering,introduces user weigh factor in forecasting evaluation formula and carries out recommendation output to confirm candidate N value.The experimental results showed that this algorithm not only solved the problem of sparse data and improved the recommendation quality and enhanced the recommendation personalized degree.
Aiming at the problem that traditional item similarity of e-commerce recommedation system has shortage in calculation and the recommedation output of TOP-N lacks personalization,an improvement algorithm was put forword.This algorithm calculates item similarity using dynamic weigh factor method,classifies items using fuzzy clustering,introduces user weigh factor in forecasting evaluation formula and carries out recommendation output to confirm candidate N value.The experimental results showed that this algorithm not only solved the problem of sparse data and improved the recommendation quality and enhanced the recommendation personalized degree.
2012, 27(2)
:84-86.
doi: 10.3969/j.issn.1004-1478.2012.02.021
Abstract:
The features of binary finite field's structure was analyzed and the inverse algorithm under binary model was summarized.The problem of finite field algorithm module not general was solved.
The features of binary finite field's structure was analyzed and the inverse algorithm under binary model was summarized.The problem of finite field algorithm module not general was solved.
2012, 27(2)
:87-90.
doi: 10.3969/j.issn.1004-1478.2012.02.022
Abstract:
To improve the utilization rate of the solar energy,the intelligent two-axis solar heater was designed.The heat collecting tubes with ratating around the horizontal axis was realized by the manual adjustment,and the heat collecting tubes with rotating around the vertical axis was realized by the self-locking function of the worm geat.The automatic tracking system was built using 89S52 single-chip microcomputer as core.The power consumption of the control system was reduced by means of the step-motor time turning and the sleeping strategy of the control system.Based on the multidisciplinary collaborative simulation technology.An experimental trial-device with the solar panels to replace the heat collecting tubes was made.Compared with the fixed solar panels,the produced electric energy of this design could improve about 20%.
To improve the utilization rate of the solar energy,the intelligent two-axis solar heater was designed.The heat collecting tubes with ratating around the horizontal axis was realized by the manual adjustment,and the heat collecting tubes with rotating around the vertical axis was realized by the self-locking function of the worm geat.The automatic tracking system was built using 89S52 single-chip microcomputer as core.The power consumption of the control system was reduced by means of the step-motor time turning and the sleeping strategy of the control system.Based on the multidisciplinary collaborative simulation technology.An experimental trial-device with the solar panels to replace the heat collecting tubes was made.Compared with the fixed solar panels,the produced electric energy of this design could improve about 20%.
2012, 27(2)
:91-94.
doi: 10.3969/j.issn.1004-1478.2012.02.023
Abstract:
Aiming at the problem that the traditional oscilloscope only can display or measure signal,a multifunctional virtual oscilloscope was designed by using graphic programming language of LabVIEW and the modular design though.It has basic function similar to common oscilloscope,and the same time,it has some merits such as signal measurement,signal operation,filtering processing and frequency spectrum analysis.The test of the virtual oscilloscope showed the system operation was reliable and the performance was good,which could meet the requirement of laboratory and scientific research.
Aiming at the problem that the traditional oscilloscope only can display or measure signal,a multifunctional virtual oscilloscope was designed by using graphic programming language of LabVIEW and the modular design though.It has basic function similar to common oscilloscope,and the same time,it has some merits such as signal measurement,signal operation,filtering processing and frequency spectrum analysis.The test of the virtual oscilloscope showed the system operation was reliable and the performance was good,which could meet the requirement of laboratory and scientific research.
2012, 27(2)
:95-98.
doi: 10.3969/j.issn.1004-1478.2012.02.024
Abstract:
Voice alarm device for misuse of automobile handbrake and overspeed driving were designed.The device comprehensively applied technologies with Holzer sensing, pyroelectric infrared sensor, wireless transmission and digital voice and so on with STC89C52 MCU as the core, thus increasing standards for speed limit to loading road of wireless transmitting and receiving module code and achieving smart prompt to speed limit of automobile, which was characterized by simple installation and easy realization.
Voice alarm device for misuse of automobile handbrake and overspeed driving were designed.The device comprehensively applied technologies with Holzer sensing, pyroelectric infrared sensor, wireless transmission and digital voice and so on with STC89C52 MCU as the core, thus increasing standards for speed limit to loading road of wireless transmitting and receiving module code and achieving smart prompt to speed limit of automobile, which was characterized by simple installation and easy realization.
2012, 27(2)
:99-101.
doi: 10.3969/j.issn.1004-1478.2012.02.025
Abstract:
Aiming at the probelm that a Xinxiang City's stepdown transformer substation load doesn't meet the requirement of development in this area,the expansion and improvement design were carried out.The lord wiring used a single bus wiring for subsection,the main transformer chose neutral grounding method directly,the short-circuit current was calcutated at the biggest/minimum operational modes.Therefore,some electrical equiments were selected.
Aiming at the probelm that a Xinxiang City's stepdown transformer substation load doesn't meet the requirement of development in this area,the expansion and improvement design were carried out.The lord wiring used a single bus wiring for subsection,the main transformer chose neutral grounding method directly,the short-circuit current was calcutated at the biggest/minimum operational modes.Therefore,some electrical equiments were selected.
2012, 27(2)
:102-104.
doi: 10.3969/j.issn.1004-1478.2012.02.026
Abstract:
Based on the effective-mass approximation,the quantum size effect on binding energy of hydorgenic impurity states in zinc-blende InGaN/GaN quantum dot was investigated by means of variational method.Numerical results showed that the donor binding energy of hydorgenic impurity depended on the impurity position and quantum dot structure in a large extent.The donor binding energy of impurity located at the center of quantum dot was the largest.Impurity donor binding energy decreased when quantum dot height and radius increase for any impurity position.
Based on the effective-mass approximation,the quantum size effect on binding energy of hydorgenic impurity states in zinc-blende InGaN/GaN quantum dot was investigated by means of variational method.Numerical results showed that the donor binding energy of hydorgenic impurity depended on the impurity position and quantum dot structure in a large extent.The donor binding energy of impurity located at the center of quantum dot was the largest.Impurity donor binding energy decreased when quantum dot height and radius increase for any impurity position.
2012, 27(2)
:105-108.
doi: 10.3969/j.issn.1004-1478.2012.02.027
Abstract:
Aiming at the problem that principal component analysis evaluation is insufficient,based on the whole principal component analysis,entropy method and cluster analysis,the method of global integration clustering was proposed.The cash data of rural residents living consumption tendency in China was analyzed.The feasibility of this method was proved by using example.
Aiming at the problem that principal component analysis evaluation is insufficient,based on the whole principal component analysis,entropy method and cluster analysis,the method of global integration clustering was proposed.The cash data of rural residents living consumption tendency in China was analyzed.The feasibility of this method was proved by using example.
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Editor-in-chief：Wei Shizhong
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Edited & published by：Editorial Department of Journal of Light Industry
CN 41-1437/TS
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