2015 Vol. 30, No. 1
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2015, 30(1)
:1-5.
doi: 10.3969/j.issn.2095-476X.2015.01.001
Abstract:
The sodium alginate-based coating was optimized by the orthogonal design method based on inhibition rate and moisture loss rate,and the changes of microbial count and moisture loss rate of stewed chicken leg dealt with sodium alginate-based coating during storage at 15~20℃ were investigated. The results showed the most optimal proportion of sodium alginate-based coating was sodium alginate 20 g/L,calcium chloride 30 g/L,glycerin 30 g/L.The sodium alginate-based coating had better preservation effect to stewed chicken leg.It could reduce moisture loss rate,prolong storage time and enhance hygiene quality of food.
The sodium alginate-based coating was optimized by the orthogonal design method based on inhibition rate and moisture loss rate,and the changes of microbial count and moisture loss rate of stewed chicken leg dealt with sodium alginate-based coating during storage at 15~20℃ were investigated. The results showed the most optimal proportion of sodium alginate-based coating was sodium alginate 20 g/L,calcium chloride 30 g/L,glycerin 30 g/L.The sodium alginate-based coating had better preservation effect to stewed chicken leg.It could reduce moisture loss rate,prolong storage time and enhance hygiene quality of food.
2015, 30(1)
:6-9.
doi: 10.3969/j.issn.2095-476X.2015.01.002
Abstract:
With bread flour as main raw material,the effects of adding proportions of four kinds of additives on bread quality index were researched.Four kinds of additives including glucose oxidase,fungi α-amylase,lipase and glycerol monostearate were added in bread recipe by different adding proportions.To make bread by direct fermentation sensory evaluation and texture analyser was used to determine the hardness of bread.The results showed that optimization of the additives adding proportions of the recipe was 30 mg glucose oxidase,2 mg fungi α-amylase,40 mg lipase,and 1.5 g glycerol monostearate in 1 kg bread flour.The baking quality of bread was the best and had good taste.
With bread flour as main raw material,the effects of adding proportions of four kinds of additives on bread quality index were researched.Four kinds of additives including glucose oxidase,fungi α-amylase,lipase and glycerol monostearate were added in bread recipe by different adding proportions.To make bread by direct fermentation sensory evaluation and texture analyser was used to determine the hardness of bread.The results showed that optimization of the additives adding proportions of the recipe was 30 mg glucose oxidase,2 mg fungi α-amylase,40 mg lipase,and 1.5 g glycerol monostearate in 1 kg bread flour.The baking quality of bread was the best and had good taste.
2015, 30(1)
:10-13.
doi: 10.3969/j.issn.2095-476X.2015.01.003
Abstract:
Water extractable and alkali extractable pentosans from black-grained wheat were obtained by water and Ba(OH)2 aqueous solution, and the physicochemical properties were analyzed by ion exchange chromatography, high performance liquid chromatography and infrared spectroscopy.The results showed that the main sugar components of WEAX were arabinose (Ara) and xylose (Xyl), with a small amount of galactose (Gal).The molar ratio of Ara:Xyl:Gal was 5.74:11.64:1.The substitution degree (A/X) of WEAX was 0.49 and the relative molecular weight (Mw) was 7.73×105.WUAX was mainly composed of Ara and Xyl.The molar ratio of Ara:Xyl was 1:1.74.The A/X was 0.57 and the Mw was 6.56×104.These indicated WEAX had a lower substitution degree, but a higher Mw than WUAX.IR spectra showed that there were characteristic absorption peaks of sugar in the two kinds of pentosan.
Water extractable and alkali extractable pentosans from black-grained wheat were obtained by water and Ba(OH)2 aqueous solution, and the physicochemical properties were analyzed by ion exchange chromatography, high performance liquid chromatography and infrared spectroscopy.The results showed that the main sugar components of WEAX were arabinose (Ara) and xylose (Xyl), with a small amount of galactose (Gal).The molar ratio of Ara:Xyl:Gal was 5.74:11.64:1.The substitution degree (A/X) of WEAX was 0.49 and the relative molecular weight (Mw) was 7.73×105.WUAX was mainly composed of Ara and Xyl.The molar ratio of Ara:Xyl was 1:1.74.The A/X was 0.57 and the Mw was 6.56×104.These indicated WEAX had a lower substitution degree, but a higher Mw than WUAX.IR spectra showed that there were characteristic absorption peaks of sugar in the two kinds of pentosan.
2015, 30(1)
:14-18.
doi: 10.3969/j.issn.2095-476X.2015.01.004
Abstract:
The best formula and the main process parameters of purple cereal-potato mixed paste (a kind of cereal-based complementary food for infants) using rice,purple rice,purple sweet potato and Chinese yam as materials were studied.By single and orthogonal experiment, the best process parameters of Chinese yam microwave heating and color protecting were obtained:the microwave output power 1 200 W, microwave heating time 60 s; the formula of color protecting was as following:Vc 0.5%, sodium chloride 1.0%, citric acid 0.6%, color protection time 5 min.The method of maturing for purple rice and purple sweet potato was studied by single factor test:purple rice was boiled 20 min in atmospheric pressure, purple sweet potato was steamed 10 min at 100℃.Using orthogonal test to determine the main formula as follow rice:purple rice:yam=5:2:2 (mass ratio), the amount of purple sweet potato, milk, sugar, salt was respectively 30%, 30%, 6%, 0.2%(the sum of the main wet raw material was 100).The amount of DHA algae oil was 2.0 mg/g.The product was suitable for eight-month-or-more infants.
The best formula and the main process parameters of purple cereal-potato mixed paste (a kind of cereal-based complementary food for infants) using rice,purple rice,purple sweet potato and Chinese yam as materials were studied.By single and orthogonal experiment, the best process parameters of Chinese yam microwave heating and color protecting were obtained:the microwave output power 1 200 W, microwave heating time 60 s; the formula of color protecting was as following:Vc 0.5%, sodium chloride 1.0%, citric acid 0.6%, color protection time 5 min.The method of maturing for purple rice and purple sweet potato was studied by single factor test:purple rice was boiled 20 min in atmospheric pressure, purple sweet potato was steamed 10 min at 100℃.Using orthogonal test to determine the main formula as follow rice:purple rice:yam=5:2:2 (mass ratio), the amount of purple sweet potato, milk, sugar, salt was respectively 30%, 30%, 6%, 0.2%(the sum of the main wet raw material was 100).The amount of DHA algae oil was 2.0 mg/g.The product was suitable for eight-month-or-more infants.
2015, 30(1)
:19-23.
doi: 10.3969/j.issn.2095-476X.2015.01.005
Abstract:
The effect of addition of different proportions of flowers volatile oil into reconstituted sheet on chemical composition of tobacco smoke was investigated using CO2 supercritical extraction to extract volatile oil from flue-cured tobacco flowers.GC-MS was used to identify the particulate matter from cigarette smoke.The results showed that the total number of volatile components was 74, 73, and 88 generated from reconstituted sheet when 0.1%, 0.2%, and 0.4% flower volatile oil was added into the sheet, respectively.The number of newly generated compounds was observed to be 38, 39, and 52, respectively, and the content of volatile components from smoke condensate was significantly improved compared to the blank control.Through the analysis of the chemical composition of cigarette smoke, the taste was not positively correlated with the addition proportion of volatile oil to reconstituted sheet.
The effect of addition of different proportions of flowers volatile oil into reconstituted sheet on chemical composition of tobacco smoke was investigated using CO2 supercritical extraction to extract volatile oil from flue-cured tobacco flowers.GC-MS was used to identify the particulate matter from cigarette smoke.The results showed that the total number of volatile components was 74, 73, and 88 generated from reconstituted sheet when 0.1%, 0.2%, and 0.4% flower volatile oil was added into the sheet, respectively.The number of newly generated compounds was observed to be 38, 39, and 52, respectively, and the content of volatile components from smoke condensate was significantly improved compared to the blank control.Through the analysis of the chemical composition of cigarette smoke, the taste was not positively correlated with the addition proportion of volatile oil to reconstituted sheet.
2015, 30(1)
:24-29.
doi: 10.3969/j.issn.2095-476X.2015.01.006
Abstract:
In order to investigate the influence of compound humectants on expanded cut tobacco, casing mode before expansion was used.Expanded cut tobacco was prepared by 0.1% compound humectants and then expanded. Physical indexes,sensory quality and moisture retentivity were compared.The results indicated that:physical indexes were enhanced obviously, the long cut rate increased from 43.4% to 50.8%, the whole cut rate increased from 69.7% to 74.1%, the filling value increased from 2.163 mm/g to 2.463 mm/g, the broken cut rate was reduced from 2.8% to 2.1%;sensory quality of expanded cut tobacco increased from 65.0 point to 68.8 point;moisture retentivity was improved visibly, balanced moisture content was elevated and speed of dehydration was decreased.
In order to investigate the influence of compound humectants on expanded cut tobacco, casing mode before expansion was used.Expanded cut tobacco was prepared by 0.1% compound humectants and then expanded. Physical indexes,sensory quality and moisture retentivity were compared.The results indicated that:physical indexes were enhanced obviously, the long cut rate increased from 43.4% to 50.8%, the whole cut rate increased from 69.7% to 74.1%, the filling value increased from 2.163 mm/g to 2.463 mm/g, the broken cut rate was reduced from 2.8% to 2.1%;sensory quality of expanded cut tobacco increased from 65.0 point to 68.8 point;moisture retentivity was improved visibly, balanced moisture content was elevated and speed of dehydration was decreased.
2015, 30(1)
:30-35.
doi: 10.3969/j.issn.2095-476X.2015.01.007
Abstract:
In order to study the pyrolysis behavior of loquat leaf extract that pyrolysates effect to the component of cigarette smoke,the pyrolysates were investigated in N2,N2 containing 10% O2 and at three temperature levels of 300℃,600℃ and 900℃, respectively.The pyrolysates were directly introduced into GC-MS, qualitative analysis of the pyrolysates by mass spectrometry, and a semi-quantitative analysis by area normalization were made.The results showed that loquat leaf extract anaerobic pyrolysis products were mainly the aldehydes, alcohols and phenols, and aerobic pyrolysis products were mainly carboxylic acids, ketones and phenols, etc.The pyrolysis products could produce grassy, spicy, fragrant baked, caramel aroma, nutty aroma, sweet, floral and other rhyme tune,which could enrich the aroma of cigarettes.The amount of these pyrolysates under aerobic conditions was more than anaerobic pyrolysates,the oxygen introduced could exacerbate the pyrolysis of loquat leaf extract.With the increase of temperature, pyrolysis was more and more complex, benzenes and polycyclic aromatic hydrocarbons substances released was found to inerease.
In order to study the pyrolysis behavior of loquat leaf extract that pyrolysates effect to the component of cigarette smoke,the pyrolysates were investigated in N2,N2 containing 10% O2 and at three temperature levels of 300℃,600℃ and 900℃, respectively.The pyrolysates were directly introduced into GC-MS, qualitative analysis of the pyrolysates by mass spectrometry, and a semi-quantitative analysis by area normalization were made.The results showed that loquat leaf extract anaerobic pyrolysis products were mainly the aldehydes, alcohols and phenols, and aerobic pyrolysis products were mainly carboxylic acids, ketones and phenols, etc.The pyrolysis products could produce grassy, spicy, fragrant baked, caramel aroma, nutty aroma, sweet, floral and other rhyme tune,which could enrich the aroma of cigarettes.The amount of these pyrolysates under aerobic conditions was more than anaerobic pyrolysates,the oxygen introduced could exacerbate the pyrolysis of loquat leaf extract.With the increase of temperature, pyrolysis was more and more complex, benzenes and polycyclic aromatic hydrocarbons substances released was found to inerease.
2015, 30(1)
:36-39.
doi: 10.3969/j.issn.2095-476X.2015.01.008
Abstract:
Aiming at the problems of slow updates in tags,incomplete marks,no timely access to information and so on in the present Web map,an autonomous tagging system of personalized Web map was put forward.The system established association between the autonomous tagging of Web map and spatial geographic information using Web 2.0 and AJAX technologies according to user generated content (UGC) ideas.The system allowed the user to participate in the autonomous tagging of Web map,and was convenient for the user to publish,query,browse city life information on the Web map.Test results showed that the system improved the access efficiency and user experience,and enhanced the network map of portability.
Aiming at the problems of slow updates in tags,incomplete marks,no timely access to information and so on in the present Web map,an autonomous tagging system of personalized Web map was put forward.The system established association between the autonomous tagging of Web map and spatial geographic information using Web 2.0 and AJAX technologies according to user generated content (UGC) ideas.The system allowed the user to participate in the autonomous tagging of Web map,and was convenient for the user to publish,query,browse city life information on the Web map.Test results showed that the system improved the access efficiency and user experience,and enhanced the network map of portability.
2015, 30(1)
:40-45.
doi: 10.3969/j.issn.2095-476X.2015.01.009
Abstract:
Aiming at the "rich data but poor information" problem under internet of manufacturing things environment in the workshop layer, a RFID-enabled work-in-process management system was presented.The SOs event model of the system was constructed by the division of workshop level and the RFID binding rules.Using XML language to semantically encapsulate the SOs event for acquisition and integration the real-time information of workshop layer.The example proved that the system had advantages of simple operation, friendly visual interface,strong practicability and stability.It could be used to improve product quality and control inventory.
Aiming at the "rich data but poor information" problem under internet of manufacturing things environment in the workshop layer, a RFID-enabled work-in-process management system was presented.The SOs event model of the system was constructed by the division of workshop level and the RFID binding rules.Using XML language to semantically encapsulate the SOs event for acquisition and integration the real-time information of workshop layer.The example proved that the system had advantages of simple operation, friendly visual interface,strong practicability and stability.It could be used to improve product quality and control inventory.
2015, 30(1)
:46-49.
doi: 10.3969/j.issn.2095-476X.2015.01.010
Abstract:
Aiming at the problem that the strong coupling between view logic and business logic of the application software based on Web three-tier structure caused the poor maintainability,the J2EE open source frameworks Struts,Spring,iBatis seamless integration technology were studied.The formation of SSI integration framework allowed the presentation layer,business layer,data persistence layer separated,to achieve "high cohesion,low coupling" goal.It was proved that the SSI integration framework technology in service-oriented campus e-commerce platform achieved superior system performance,high scalability and maintainability.
Aiming at the problem that the strong coupling between view logic and business logic of the application software based on Web three-tier structure caused the poor maintainability,the J2EE open source frameworks Struts,Spring,iBatis seamless integration technology were studied.The formation of SSI integration framework allowed the presentation layer,business layer,data persistence layer separated,to achieve "high cohesion,low coupling" goal.It was proved that the SSI integration framework technology in service-oriented campus e-commerce platform achieved superior system performance,high scalability and maintainability.
2015, 30(1)
:50-54.
doi: 10.3969/j.issn.2095-476X.2015.01.011
Abstract:
The traditional decision tree algorithms such as ID3 usually uses a single attribute as the basis of branching judgment.The scale of the tree generated by ID3 is very large and rules formed are difficult to understand.Aiming at the problems described above, an algorithm was proposed using multi-variable as the judging conditions of node attributes.By using the property of attribute dependency in rough set and choosing nuclear properties of condition attributes relative to decision attributes in the information system as multi-variable node attributes,the algorithm used the concept of relative generalization to aid the branching process and generated a multi-variable decision tree.Through the analysis of example and by comparing with the conventional ID3 algorithm, the high efficiency of the improved algorithm was verified.
The traditional decision tree algorithms such as ID3 usually uses a single attribute as the basis of branching judgment.The scale of the tree generated by ID3 is very large and rules formed are difficult to understand.Aiming at the problems described above, an algorithm was proposed using multi-variable as the judging conditions of node attributes.By using the property of attribute dependency in rough set and choosing nuclear properties of condition attributes relative to decision attributes in the information system as multi-variable node attributes,the algorithm used the concept of relative generalization to aid the branching process and generated a multi-variable decision tree.Through the analysis of example and by comparing with the conventional ID3 algorithm, the high efficiency of the improved algorithm was verified.
2015, 30(1)
:55-62.
doi: 10.3969/j.issn.2095-476X.2015.01.012
Abstract:
The operating principle and coding tools of two kinds of extension of HEVC (high efficiency video coding) standards including MV-HEVC (high efficiency video coding based multiview) and 3D-HEVC (high efficiency video coding based 3D video coding) were reviewed.The feature,coding modules and method of 3D-HEVC model were analyzed,and the performances between 3D-HEVC and MV-HEVC were compared.The conclusion showed that 3D-HEVC synthesized virtual view with the format of texture video plus depth,thus its bit rates would be reduced notably,so 3D-HEVC would be applied to many kinds of 3D experience like 3D TV,free viewpoint video and 3D digital movie. With the development of smart mobile devices,handheld terminal using 3D-HEVC to support multiview 3D video would become the research tendency in the future.
The operating principle and coding tools of two kinds of extension of HEVC (high efficiency video coding) standards including MV-HEVC (high efficiency video coding based multiview) and 3D-HEVC (high efficiency video coding based 3D video coding) were reviewed.The feature,coding modules and method of 3D-HEVC model were analyzed,and the performances between 3D-HEVC and MV-HEVC were compared.The conclusion showed that 3D-HEVC synthesized virtual view with the format of texture video plus depth,thus its bit rates would be reduced notably,so 3D-HEVC would be applied to many kinds of 3D experience like 3D TV,free viewpoint video and 3D digital movie. With the development of smart mobile devices,handheld terminal using 3D-HEVC to support multiview 3D video would become the research tendency in the future.
2015, 30(1)
:63-66.
doi: 10.3969/j.issn.2095-476X.2015.01.013
Abstract:
Aiming at the problem that UAV aerial image was not obvious to scale change,an improved CS-SIFT feature matching algorithm was presented based on the classical feature matching algorithm of SIFT (scale invariant feature transform).The algorithm established S-layer pyramid to reduce the multi-scale space and the number of feature points.In the matching feature vectors,quasi-Euclidean distance substituted commonly used Euclidean distance and geometric constraints limitd by eliminating part of the registration error points to further improve the efficiency of feature matching.The simulation results using Matlab language indicated that the improved algorithm had higher matching accuracy and needed less matching time and it was quite suitable for the UAV aerial system of high real-time demand.
Aiming at the problem that UAV aerial image was not obvious to scale change,an improved CS-SIFT feature matching algorithm was presented based on the classical feature matching algorithm of SIFT (scale invariant feature transform).The algorithm established S-layer pyramid to reduce the multi-scale space and the number of feature points.In the matching feature vectors,quasi-Euclidean distance substituted commonly used Euclidean distance and geometric constraints limitd by eliminating part of the registration error points to further improve the efficiency of feature matching.The simulation results using Matlab language indicated that the improved algorithm had higher matching accuracy and needed less matching time and it was quite suitable for the UAV aerial system of high real-time demand.
2015, 30(1)
:67-70.
doi: 10.3969/j.issn.2095-476X.2015.01.014
Abstract:
Aiming at the defect that the traditional Canny operator edge detection easily lost the edge details,an improved technology was developed to extract the edges of the leaf disease region. More complete gradient information was preserved by using Otsu to binary plant disease images and adding on two oblique directions gradient information extraction, so as to get a more complete edge image. The experimental results showed that this method could effectively filter out noise in the image and detect the details of the gradient, remove the false edges and noise edges and get the lesion edges more accurately.
Aiming at the defect that the traditional Canny operator edge detection easily lost the edge details,an improved technology was developed to extract the edges of the leaf disease region. More complete gradient information was preserved by using Otsu to binary plant disease images and adding on two oblique directions gradient information extraction, so as to get a more complete edge image. The experimental results showed that this method could effectively filter out noise in the image and detect the details of the gradient, remove the false edges and noise edges and get the lesion edges more accurately.
2015, 30(1)
:71-76.
doi: 10.3969/j.issn.2095-476X.2015.01.015
Abstract:
Intermetallics TiAl alloy is one of the most promising materials for new generation high temperature structural application due to the properties of low-density and high temperature.The development, research status, effects of alloying elements and microstructure control technologies of TiAl alloys were reviewed.At present, the low room temperature ductility, insufficient high temperature strength and high cost of manufacture were the main problems.The practical method to improve the comprehensive mechanical properties was multi-component alloying and accurate microstructure control, which was also the important research field of TiAl alloys in the future.
Intermetallics TiAl alloy is one of the most promising materials for new generation high temperature structural application due to the properties of low-density and high temperature.The development, research status, effects of alloying elements and microstructure control technologies of TiAl alloys were reviewed.At present, the low room temperature ductility, insufficient high temperature strength and high cost of manufacture were the main problems.The practical method to improve the comprehensive mechanical properties was multi-component alloying and accurate microstructure control, which was also the important research field of TiAl alloys in the future.
2015, 30(1)
:77-80,99.
doi: 10.3969/j.issn.2095-476X.2015.01.016
Abstract:
Typical three-wheel disk structure was chosen in order to improve the accuracy of the stress distribution of 2D finite element model of the engine fan disk. Three-wheel fan disk structure of 3D finite element modeling was completed by using ANSYS 12.0. And the three-wheel fan disk of 2D axisymmetric finite element model was established. The non axisymmetric load was decomposed into Fourier series. Solution of radial stress,circumferential stress and equivalent stress was done subsequently. Compared with typical 2D analysis load, 2D non axisymmetric load and 3D analysis load show that the stress distribution of 2D model applying the uniform load is far away from the stress distribution of 3D model, and the stress distribution of 2D model applying the non axisymmetric load was close to the stress distribution of 3D model. Compared with applying the uniform load, this method can improve the accuracy of the stress distribution of 2D finite element model of the engine fan disk.
Typical three-wheel disk structure was chosen in order to improve the accuracy of the stress distribution of 2D finite element model of the engine fan disk. Three-wheel fan disk structure of 3D finite element modeling was completed by using ANSYS 12.0. And the three-wheel fan disk of 2D axisymmetric finite element model was established. The non axisymmetric load was decomposed into Fourier series. Solution of radial stress,circumferential stress and equivalent stress was done subsequently. Compared with typical 2D analysis load, 2D non axisymmetric load and 3D analysis load show that the stress distribution of 2D model applying the uniform load is far away from the stress distribution of 3D model, and the stress distribution of 2D model applying the non axisymmetric load was close to the stress distribution of 3D model. Compared with applying the uniform load, this method can improve the accuracy of the stress distribution of 2D finite element model of the engine fan disk.
2015, 30(1)
:81-84.
doi: 10.3969/j.issn.2095-476X.2015.01.017
Abstract:
The temperature field and stress field of the twin-web turbine were studied based on the ANSYS. Through dividing different parts of the turbine disk into different heat transfer model,the temperature field distribution was accurately calculated.And then the stress field distribution of the twin-web turbine disk was calculated by using the method of the indirect heat-structure coupling. The results showed that the maximum average radial stress, the maximum average circumferential stress and the average circumferential stress of plate heart were 702.35 MPa, 679.68 MPa and 880.98 MPa,respectively.It not only met the requirement of the safety sactor, but also was less than the value of the yield strength,1 070 MPa. So the structure completely met the requirements of strength, and had the large development potential.
The temperature field and stress field of the twin-web turbine were studied based on the ANSYS. Through dividing different parts of the turbine disk into different heat transfer model,the temperature field distribution was accurately calculated.And then the stress field distribution of the twin-web turbine disk was calculated by using the method of the indirect heat-structure coupling. The results showed that the maximum average radial stress, the maximum average circumferential stress and the average circumferential stress of plate heart were 702.35 MPa, 679.68 MPa and 880.98 MPa,respectively.It not only met the requirement of the safety sactor, but also was less than the value of the yield strength,1 070 MPa. So the structure completely met the requirements of strength, and had the large development potential.
2015, 30(1)
:85-89.
doi: 10.3969/j.issn.2095-476X.2015.01.018
Abstract:
Analogous vacuum electrostatic adsorption technology based on electrode array optimazation was put foward. Based on the mechanism of role of Kulun, J-R effect and the electrostatic adsorption, The finite element analysis method was used to construct the triode adsorption force output model for guiding the optimized design of electrode array.Using electrorheological adhesive technology, several groups of different suction slot depth and duty ratio of analyogous vacuum electrostatic chuck were designed to further improve the adsorption force.Analogous vacuum electrostatic adsorption technology was applied in the handheld wireless control electric adsorption climbing robot.The running results of the robot verified the feasibility of this method.
Analogous vacuum electrostatic adsorption technology based on electrode array optimazation was put foward. Based on the mechanism of role of Kulun, J-R effect and the electrostatic adsorption, The finite element analysis method was used to construct the triode adsorption force output model for guiding the optimized design of electrode array.Using electrorheological adhesive technology, several groups of different suction slot depth and duty ratio of analyogous vacuum electrostatic chuck were designed to further improve the adsorption force.Analogous vacuum electrostatic adsorption technology was applied in the handheld wireless control electric adsorption climbing robot.The running results of the robot verified the feasibility of this method.
2015, 30(1)
:90-94.
doi: 10.3969/j.issn.2095-476X.2015.01.019
Abstract:
It is difficult to establishe accurate mathematical model to realize the closed-loop control,because of the complex nonlinear relationship among the wind speed,pressure loss,feed-gas ratio and other parameters in grain partieles pneumatic transport.To solve this problem,with CXLD50 suction pressure mixed conveying mobile grain sucking machine as the research platform,fuzzy control strategy was put forward with the material flow prediction of BP neural network as feedback loop.The system uses the material flow prediction model based on neural network tools which could quickly and conveniently online measured two-phase flow.After comparing the model output flow of prediction and expectation,it was input to the fuzzy controller for judgement and output.Simulation showed that the system has rapid response,achieving ideal output in 50 s and strong anti-interference ability,keeping deviation stable in ±0.5 kg/s so that the fuzzy control system could improve the signal of off-line measurement feedback lag and raise the stability of transport system.
It is difficult to establishe accurate mathematical model to realize the closed-loop control,because of the complex nonlinear relationship among the wind speed,pressure loss,feed-gas ratio and other parameters in grain partieles pneumatic transport.To solve this problem,with CXLD50 suction pressure mixed conveying mobile grain sucking machine as the research platform,fuzzy control strategy was put forward with the material flow prediction of BP neural network as feedback loop.The system uses the material flow prediction model based on neural network tools which could quickly and conveniently online measured two-phase flow.After comparing the model output flow of prediction and expectation,it was input to the fuzzy controller for judgement and output.Simulation showed that the system has rapid response,achieving ideal output in 50 s and strong anti-interference ability,keeping deviation stable in ±0.5 kg/s so that the fuzzy control system could improve the signal of off-line measurement feedback lag and raise the stability of transport system.
Design and realization of the embedded ethernet controller based on NicheStack TCP/IP protocol stack
2015, 30(1)
:95-99.
doi: 10.3969/j.issn.2095-476X.2015.01.020
Abstract:
In order to solve the problems of the traditional embedded Ethernet system,such as low data transmission rate,hardware cannot be upgraded,poor real-time and universality etc,the Ethernet controller design scheme based on Altera Cyclone series FPGA with Nios Ⅱ CPU was proposed.The design aimed at Ethernet protocal using the Quartus Ⅱ and Nios Ⅱ IDE as the development tools for reconfiguration of the hardware in order to reduce the cost and improve the system integration.The SOPC technology was used to construct the embedded network hardware platform and based on μC/OS-Ⅱ to achieve the migration of NicheStack TCP/IP and compiling of the top application.The system test results showed that the design met the requirement of the Ethernet communication rate at the data rate of about 400 Mb/s,and could be flexible configurated according to actual situation.
In order to solve the problems of the traditional embedded Ethernet system,such as low data transmission rate,hardware cannot be upgraded,poor real-time and universality etc,the Ethernet controller design scheme based on Altera Cyclone series FPGA with Nios Ⅱ CPU was proposed.The design aimed at Ethernet protocal using the Quartus Ⅱ and Nios Ⅱ IDE as the development tools for reconfiguration of the hardware in order to reduce the cost and improve the system integration.The SOPC technology was used to construct the embedded network hardware platform and based on μC/OS-Ⅱ to achieve the migration of NicheStack TCP/IP and compiling of the top application.The system test results showed that the design met the requirement of the Ethernet communication rate at the data rate of about 400 Mb/s,and could be flexible configurated according to actual situation.
2015, 30(1)
:100-103.
doi: 10.3969/j.issn.2095-476X.2015.01.021
Abstract:
In order to solve the problem that it is difficult to detect the QRS wave of ECG based on portable digital 12-lead ECG cable, according to the characteristics of time-domain and frequency-domain based on the signal processing method,and the theory of the relation between the singularity and the severe changing point of signal, the detection of QRS wave of ECG was achieved.The simulation results showed that the method had more accuracy for diagnosing QRS wave,especially R wave.
In order to solve the problem that it is difficult to detect the QRS wave of ECG based on portable digital 12-lead ECG cable, according to the characteristics of time-domain and frequency-domain based on the signal processing method,and the theory of the relation between the singularity and the severe changing point of signal, the detection of QRS wave of ECG was achieved.The simulation results showed that the method had more accuracy for diagnosing QRS wave,especially R wave.
2015, 30(1)
:104-108.
doi: 10.3969/j.issn.2095-476X.2015.01.022
Abstract:
The IgE detection principle, detection limit and linear range using electrochemical aptamer sensors, optical aptamer sensors and piezoelectric aptamer sensor were reviewed. Applying nanotechnology to aptamer sensor to detect IgE would become the research direction.
The IgE detection principle, detection limit and linear range using electrochemical aptamer sensors, optical aptamer sensors and piezoelectric aptamer sensor were reviewed. Applying nanotechnology to aptamer sensor to detect IgE would become the research direction.
Journal Information
Founded in 1986， bimonthly
Administered by：The Education Department Henan Province
Sponsored by：Zhengzhou University of Light Industry
Editor-in-chief：Wei Shizhong
Executive Editor-in-Chief：Zou Lin
Subeditor：Qu Shuanghong
Edited & published by：Editorial Department of Journal of Light Industry
CN 41-1437/TS
ISSN 2096-1553
Address：136 Science Avenue, Zhengzhou City, Henan Province, China
Postal Code：450001
Tel：(086)0371-86608635
(086)0371-86608633
