2011 Vol. 26, No. 5
Display Method: |
2011, 26(5)
:1-4.
doi: 10.3969/j.issn.1004-1478.2011.05.001
Abstract:
From the points of comfort and energy saving,the display cabinet radiation should be taken into consideration when the parameter of HVAC system in supermarkets was set.And an experimental investigation was undertaken in test room.The results showed that:when 27℃,60% of humidity in summer and ≤21℃,30% of humidity in winter was set as the parameter of air conditioning in supermarket,the good energy saving and thermal comfort could be met.
From the points of comfort and energy saving,the display cabinet radiation should be taken into consideration when the parameter of HVAC system in supermarkets was set.And an experimental investigation was undertaken in test room.The results showed that:when 27℃,60% of humidity in summer and ≤21℃,30% of humidity in winter was set as the parameter of air conditioning in supermarket,the good energy saving and thermal comfort could be met.
2011, 26(5)
:5-7.
doi: 10.3969/j.issn.1004-1478.2011.05.002
Abstract:
The operating performance of air heat pump water heater with static heating was tested based on air conditioning measurement platform.At ambient temperature of (20±1)℃ with water tank temperature from 15℃ to 55℃,the system parameters such as suction pressure and suction temperature had no significant change.Discharge pressure,discharge temperature,compression ratio and compressor input power all rose.The average COP was about 4.76,and the system showed feasibility in energy saving.
The operating performance of air heat pump water heater with static heating was tested based on air conditioning measurement platform.At ambient temperature of (20±1)℃ with water tank temperature from 15℃ to 55℃,the system parameters such as suction pressure and suction temperature had no significant change.Discharge pressure,discharge temperature,compression ratio and compressor input power all rose.The average COP was about 4.76,and the system showed feasibility in energy saving.
2011, 26(5)
:8-12.
doi: 10.3969/j.issn.1004-1478.2011.05.003
Abstract:
To accurately analyze dynamic transient thermal characteristics of high speed motorized spindle system,the Solidworks,Hypermesh and Marc soft wares are synthetically used for meshing and assembling,the heat and power were transfered by definition contact between the components.By this method,dynamic thermal characteristics analysis of motorized spindle system is carried out,and the simulation results are accord with the measuring results.The high quality grids can be rapidly plotted,easily amended and managed by the method,and this method is also applicable to other large assembly meshing.
To accurately analyze dynamic transient thermal characteristics of high speed motorized spindle system,the Solidworks,Hypermesh and Marc soft wares are synthetically used for meshing and assembling,the heat and power were transfered by definition contact between the components.By this method,dynamic thermal characteristics analysis of motorized spindle system is carried out,and the simulation results are accord with the measuring results.The high quality grids can be rapidly plotted,easily amended and managed by the method,and this method is also applicable to other large assembly meshing.
2011, 26(5)
:13-17.
doi: 10.3969/j.issn.1004-1478.2011.05.004
Abstract:
A method of getting extract stress distribution and shape of suspension bridge at the finished dead state was provided.First of all the theme of optimized design of structure and the tool of optimized design of structure in the ANSYS is used to find the extract stress distribution at the finished dead state,then the shape of suspension bridge at cable finished stage was gotten by using reverse disassembly method.From comparing with the results by using numerical-analytical,it is found that this method can quickly find the shape of suspension bridge at cable finished stage and can meet the requirement of engineering.
A method of getting extract stress distribution and shape of suspension bridge at the finished dead state was provided.First of all the theme of optimized design of structure and the tool of optimized design of structure in the ANSYS is used to find the extract stress distribution at the finished dead state,then the shape of suspension bridge at cable finished stage was gotten by using reverse disassembly method.From comparing with the results by using numerical-analytical,it is found that this method can quickly find the shape of suspension bridge at cable finished stage and can meet the requirement of engineering.
2011, 26(5)
:18-21.
doi: 10.3969/j.issn.1004-1478.2011.05.005
Abstract:
Select important buildings in city for research object,the earthquake disaster forecast on buldings are analized and calculated by using the software SAP.By calculating interlayer displacement angle,and using the simplified method,important buildings earthquake damage evaluation is made.The results showed that it can meet the requirements of the comprehensive urban earthquake disaster prevention plan compiling.
Select important buildings in city for research object,the earthquake disaster forecast on buldings are analized and calculated by using the software SAP.By calculating interlayer displacement angle,and using the simplified method,important buildings earthquake damage evaluation is made.The results showed that it can meet the requirements of the comprehensive urban earthquake disaster prevention plan compiling.
2011, 26(5)
:22-26.
doi: 10.3969/j.issn.1004-1478.2011.05.006
Abstract:
On the basis of the comparison of the MU of difference of IEC60044-7/8 and IEC61850-9-1,the main modules and hardware scheme about MU based on DSP&FPGA is constructed according to IEC 61850-9-1.The hardware scheme adopts the design idea of partial plugin.It ensures that the data transmission is real-time and accurate.
On the basis of the comparison of the MU of difference of IEC60044-7/8 and IEC61850-9-1,the main modules and hardware scheme about MU based on DSP&FPGA is constructed according to IEC 61850-9-1.The hardware scheme adopts the design idea of partial plugin.It ensures that the data transmission is real-time and accurate.
2011, 26(5)
:27-30.
doi: 10.3969/j.issn.1004-1478.2011.05.007
Abstract:
The hydraulic system for asphalt mortar car is difficult to control precisely.Empirical method and hydraulic system theoretical knowledge are combined to be adopted to identify the hydraulic system.Based on the identified model,PID parameters of the control system are set separately by using PSO algorithm.Some comparative research are studied by using three different fitness functions,such as IAE,ISE and ITSE.The results showed that the similarity between identified hydraulic system and the practical system is up to 96%;By comparison,the system using the PID parameters which were obtained by PSO based on ITSE has a faster response,better stability and higher accuracy.
The hydraulic system for asphalt mortar car is difficult to control precisely.Empirical method and hydraulic system theoretical knowledge are combined to be adopted to identify the hydraulic system.Based on the identified model,PID parameters of the control system are set separately by using PSO algorithm.Some comparative research are studied by using three different fitness functions,such as IAE,ISE and ITSE.The results showed that the similarity between identified hydraulic system and the practical system is up to 96%;By comparison,the system using the PID parameters which were obtained by PSO based on ITSE has a faster response,better stability and higher accuracy.
2011, 26(5)
:31-33,47.
doi: 10.3969/j.issn.1004-1478.2011.05.008
Abstract:
Based on the new 8-bit high speed microcontroller STC12C5A60S2,comprehensive using the SMALL RTOS51 embedded real-time operating system,znFAT embedded file system and WAV format decoding technology,a digital photo frame was designed.The photo frame has the advantages of small size,simple interface,easy implementation and low price,etc.,and the music play flowing,good sound texture and smooth switch of picture.
Based on the new 8-bit high speed microcontroller STC12C5A60S2,comprehensive using the SMALL RTOS51 embedded real-time operating system,znFAT embedded file system and WAV format decoding technology,a digital photo frame was designed.The photo frame has the advantages of small size,simple interface,easy implementation and low price,etc.,and the music play flowing,good sound texture and smooth switch of picture.
2011, 26(5)
:34-37.
doi: 10.3969/j.issn.1004-1478.2011.05.009
Abstract:
A pitch detection algorithm based on auto-correlation function(ACF) was proposed and improvement can be achieved by the use of the modified ACF.According to ACF in combination with pre-processing and post-processing technique,the discrimination on sonant and surd excitation speech signal and pitch detection of sonant excitation speech signal can be completed effectively.
A pitch detection algorithm based on auto-correlation function(ACF) was proposed and improvement can be achieved by the use of the modified ACF.According to ACF in combination with pre-processing and post-processing technique,the discrimination on sonant and surd excitation speech signal and pitch detection of sonant excitation speech signal can be completed effectively.
2011, 26(5)
:38-40.
doi: 10.3969/j.issn.1004-1478.2011.05.010
Abstract:
The laws between self-mixing interferometric signal and optical feedback factor are achieved with optical feedback self-mixing interferometric effect.A new algorithm for estimating optical feedback factor is proposed with the use of difference of the peak values.Simulation result showed that the algorithm was very simple and had high reliability.
The laws between self-mixing interferometric signal and optical feedback factor are achieved with optical feedback self-mixing interferometric effect.A new algorithm for estimating optical feedback factor is proposed with the use of difference of the peak values.Simulation result showed that the algorithm was very simple and had high reliability.
2011, 26(5)
:41-44.
doi: 10.3969/j.issn.1004-1478.2011.05.011
Abstract:
A new QoS mechanism of multimedia network application was proposed.Under the given bandwidth resource,the new mechanism can support more multimedia network application users at the expense of multimedia network application quality.The core algorithm EEWMA (evolution to exponential weighted moving average) evolved from algorithm EWMA (exponential weighted moving average),and the EEWMA is a network status prediction algorithm.An appropriate prediction result for special network environment and demands,balanced between prediction precision and resource consumption,can be got by EEWMA.EEWMA can get a good prediction result to any time interval in the time range of most valid network applications connection,proved by the experiment adopting a standard database.
A new QoS mechanism of multimedia network application was proposed.Under the given bandwidth resource,the new mechanism can support more multimedia network application users at the expense of multimedia network application quality.The core algorithm EEWMA (evolution to exponential weighted moving average) evolved from algorithm EWMA (exponential weighted moving average),and the EEWMA is a network status prediction algorithm.An appropriate prediction result for special network environment and demands,balanced between prediction precision and resource consumption,can be got by EEWMA.EEWMA can get a good prediction result to any time interval in the time range of most valid network applications connection,proved by the experiment adopting a standard database.
2011, 26(5)
:45-47.
doi: 10.3969/j.issn.1004-1478.2011.05.012
Abstract:
By analyzing the major factors which affect the cache performance,such as object size,frequency,and access delay,by choosing cost factor,three optimized models are obtained:maximization of hit rate,maximization of byte hit rate and minimization of delay.The analytical result showed that the optimizing models are right.In practical application,the optimized models have flexibility and feasibility.
By analyzing the major factors which affect the cache performance,such as object size,frequency,and access delay,by choosing cost factor,three optimized models are obtained:maximization of hit rate,maximization of byte hit rate and minimization of delay.The analytical result showed that the optimizing models are right.In practical application,the optimized models have flexibility and feasibility.
2011, 26(5)
:48-52.
doi: 10.3969/j.issn.1004-1478.2011.05.013
Abstract:
A DCT domain blind watermarking algorithm was proposed based on Arnold and quantification.Firstly Arnold chaotic scrambling to the watermarking is conducted before the embedding to reduce the correlation between pixels and improve the security of the watermarking;then according to the bit values of watermarking which is to be embedded,different methods are used to quantize the frequency coefficient of each sub-block;and then based on the coefficient characteristics of embedding watermarking,the watermarking is extracted in which the watermarking extraction process does not require the original image so as to achieved the blind extraction.Numbers of experiments show that the algorithm has good robustness and transparency in cope with common attacks.
A DCT domain blind watermarking algorithm was proposed based on Arnold and quantification.Firstly Arnold chaotic scrambling to the watermarking is conducted before the embedding to reduce the correlation between pixels and improve the security of the watermarking;then according to the bit values of watermarking which is to be embedded,different methods are used to quantize the frequency coefficient of each sub-block;and then based on the coefficient characteristics of embedding watermarking,the watermarking is extracted in which the watermarking extraction process does not require the original image so as to achieved the blind extraction.Numbers of experiments show that the algorithm has good robustness and transparency in cope with common attacks.
2011, 26(5)
:53-55,64.
doi: 10.3969/j.issn.1004-1478.2011.05.014
Abstract:
Because the current situation of the frequent occurrence of food security events,PDF417 two-dimensional bar code encoding and decoding components were designed and implemented based on COM technology,and applied to the food safety backtracking system.Through effective monitoring of the life cycle of problems food,they can be traced quickly,and the source can be found and the fast positioning of the flow of food can be achieved.
Because the current situation of the frequent occurrence of food security events,PDF417 two-dimensional bar code encoding and decoding components were designed and implemented based on COM technology,and applied to the food safety backtracking system.Through effective monitoring of the life cycle of problems food,they can be traced quickly,and the source can be found and the fast positioning of the flow of food can be achieved.
2011, 26(5)
:56-59.
doi: 10.3969/j.issn.1004-1478.2011.05.015
Abstract:
Aimming at the general workflow system can't handle exception operation,the basic exception handling operation models were built based on stochastic Petri net.The results showed that in the case of abnormal increase of support exception handling operation,flexible workflow performance is superior to the general workflow system.
Aimming at the general workflow system can't handle exception operation,the basic exception handling operation models were built based on stochastic Petri net.The results showed that in the case of abnormal increase of support exception handling operation,flexible workflow performance is superior to the general workflow system.
2011, 26(5)
:60-64.
doi: 10.3969/j.issn.1004-1478.2011.05.016
Abstract:
The acid-hydrolyzed potato starch-oleic acid complex were prepared by using acid-hydrolyzed potato starch and oleic-acid.X-ray diffraction is used to investigate respectively effects of acid-hyrolyzed time,ligands ratio and starch concentration conditions.The results showed that acid-hydrolyzed potato starch-oleic acid is V-type,with extending acid hydrolyzed time and increasing ligands ratio,diffraction peak intensity increases and complex crystalline structure is more and more complete,but crystallinity does not change significantly.When raw material concentration is 2%,the crystallinity of the formed complex is approximately highest and about 82.23%.
The acid-hydrolyzed potato starch-oleic acid complex were prepared by using acid-hydrolyzed potato starch and oleic-acid.X-ray diffraction is used to investigate respectively effects of acid-hyrolyzed time,ligands ratio and starch concentration conditions.The results showed that acid-hydrolyzed potato starch-oleic acid is V-type,with extending acid hydrolyzed time and increasing ligands ratio,diffraction peak intensity increases and complex crystalline structure is more and more complete,but crystallinity does not change significantly.When raw material concentration is 2%,the crystallinity of the formed complex is approximately highest and about 82.23%.
2011, 26(5)
:65-69.
doi: 10.3969/j.issn.1004-1478.2011.05.017
Abstract:
By adsorption method,adsorption character and mechanism of Cu2+ by celery residue were studied.The results showed that with the smaller size of celery residue,Cu2+ adsorption rate increases.Under the same Cu2+ initial concentration,with the addition of more celery residue,Cu2+ adsorption rate increases.Under the same addition amount of celery residue,Cu2+ adsorption rate all has once maximum value,as initial concentration is 15 mg/L.Orthogonal tests showed that the optimum adsorption conditions are the wastewater pH=6,temperature 30℃ and soaking time 3 h,and influence degree for 3 factors from big to small is pH,temperature and soaking time.Single molecule layer absorption dominant is Cu2+ adsorption,and adsorption isotherm is fit to Freundlich adsorption isotherm.Under standard condition,the adsorption heat for celery residue on Cu2+ is 10.49 kJ/mol.The adsorption rate for celery residue to Cu2+ is quick first,and then become slow after more than 60 min.First kinetic model can describe the adsorption kinetics of celery residue more better.
By adsorption method,adsorption character and mechanism of Cu2+ by celery residue were studied.The results showed that with the smaller size of celery residue,Cu2+ adsorption rate increases.Under the same Cu2+ initial concentration,with the addition of more celery residue,Cu2+ adsorption rate increases.Under the same addition amount of celery residue,Cu2+ adsorption rate all has once maximum value,as initial concentration is 15 mg/L.Orthogonal tests showed that the optimum adsorption conditions are the wastewater pH=6,temperature 30℃ and soaking time 3 h,and influence degree for 3 factors from big to small is pH,temperature and soaking time.Single molecule layer absorption dominant is Cu2+ adsorption,and adsorption isotherm is fit to Freundlich adsorption isotherm.Under standard condition,the adsorption heat for celery residue on Cu2+ is 10.49 kJ/mol.The adsorption rate for celery residue to Cu2+ is quick first,and then become slow after more than 60 min.First kinetic model can describe the adsorption kinetics of celery residue more better.
2011, 26(5)
:70-74.
doi: 10.3969/j.issn.1004-1478.2011.05.018
Abstract:
The catalytic reaction characteristics of different lipase,protease,oxidoreductase,cellulase and glycosidase in ionic lipuid were reviewed.Compared with the organic solvent in the enzyme reaction,the majority of enzymes in ionic liquids show high catalytic activity,stability and selectivity,but also can improve the yield and recycle the ionic liquid.The focuses of future research are:the biocatalysis reaction mechanism in ionic liquid,the relationship between structure and properties of ionic liquid,the relationship between ionic liquid and enzyme,the enzyme reaction characteristics and properties changes in ionic liquid.
The catalytic reaction characteristics of different lipase,protease,oxidoreductase,cellulase and glycosidase in ionic lipuid were reviewed.Compared with the organic solvent in the enzyme reaction,the majority of enzymes in ionic liquids show high catalytic activity,stability and selectivity,but also can improve the yield and recycle the ionic liquid.The focuses of future research are:the biocatalysis reaction mechanism in ionic liquid,the relationship between structure and properties of ionic liquid,the relationship between ionic liquid and enzyme,the enzyme reaction characteristics and properties changes in ionic liquid.
2011, 26(5)
:75-79.
doi: 10.3969/j.issn.1004-1478.2011.05.019
Abstract:
The relationship and relevant mechanism between trans fatty acids (TFA) and type Ⅱ diabetes mellitus and cardiovascular diseases are explored on the basis of overseas and domestic epidemiological studies and some research reports related with TFA.The pathologic effect of TFA on people is that has an important influence on blood fat,inflammatory factor,endotheliocyte function,insulin resistance and immunity.The diet TFA will combine peroxisome proliferation activated receptors (PPARs) competing with polyunsaturated fatty acid when it enters into the organism,down-regulate protective effect of PPARs on organism,reduce fatty acid metabolism enzyme gene expression and cell glucose transport body gene expression,reduce insulin receptor sensibility,at the same time it enhance the inflammatory factor expression and give rise to blood fat unusually,insulin resistance,vascular endothelium reconsitution and dysfunction,therefore cause to happen type Ⅱ diabetes mellitus,cardiovascular diseases.
The relationship and relevant mechanism between trans fatty acids (TFA) and type Ⅱ diabetes mellitus and cardiovascular diseases are explored on the basis of overseas and domestic epidemiological studies and some research reports related with TFA.The pathologic effect of TFA on people is that has an important influence on blood fat,inflammatory factor,endotheliocyte function,insulin resistance and immunity.The diet TFA will combine peroxisome proliferation activated receptors (PPARs) competing with polyunsaturated fatty acid when it enters into the organism,down-regulate protective effect of PPARs on organism,reduce fatty acid metabolism enzyme gene expression and cell glucose transport body gene expression,reduce insulin receptor sensibility,at the same time it enhance the inflammatory factor expression and give rise to blood fat unusually,insulin resistance,vascular endothelium reconsitution and dysfunction,therefore cause to happen type Ⅱ diabetes mellitus,cardiovascular diseases.
2011, 26(5)
:80-83,95.
doi: 10.3969/j.issn.1004-1478.2011.05.020
Abstract:
The types,structures,biological characteristics,pathogenic of enterovirus detection methods of enterovirus were summarized.By comparing the advantage and disadvantaeg of every detection method,it was found that the specific advantage of immunological method was the best convenient and fastest detection methods,especially immune colloidal gold detection methods and enzyme-linked immunosorbent detection methods.It was put forward that determination of the common enterovirus antigens and the development of colloidal gold test strips of common intestinal virus detection methods was important in the common detection methods about enterovirus.
The types,structures,biological characteristics,pathogenic of enterovirus detection methods of enterovirus were summarized.By comparing the advantage and disadvantaeg of every detection method,it was found that the specific advantage of immunological method was the best convenient and fastest detection methods,especially immune colloidal gold detection methods and enzyme-linked immunosorbent detection methods.It was put forward that determination of the common enterovirus antigens and the development of colloidal gold test strips of common intestinal virus detection methods was important in the common detection methods about enterovirus.
2011, 26(5)
:84-87.
doi: 10.3969/j.issn.1004-1478.2011.05.021
Abstract:
In order to realize the systematic design of cigarette's weight and relative target's standard value,firstly,according to the controlling area of smoke index such as tar yield,the variation range of standard value of cigarette's weight was obtained on the basis of the linear regression equation building between cigarette's weight,tar yield,nicotine,CO yield,draw resistance and hardness.And then,considering the factors of sensory quality and consumption,the standard value of cigarette's weight was selected.Finally,standard value of draw resistance and hardness was designed according to the standard value of cigarette's weight.The cigarette's weight and relative target's standard value established by this method can avoid the confliction between targets,and improve the controlling accuracy and passing rate of targets such as draw resistance and hardness.
In order to realize the systematic design of cigarette's weight and relative target's standard value,firstly,according to the controlling area of smoke index such as tar yield,the variation range of standard value of cigarette's weight was obtained on the basis of the linear regression equation building between cigarette's weight,tar yield,nicotine,CO yield,draw resistance and hardness.And then,considering the factors of sensory quality and consumption,the standard value of cigarette's weight was selected.Finally,standard value of draw resistance and hardness was designed according to the standard value of cigarette's weight.The cigarette's weight and relative target's standard value established by this method can avoid the confliction between targets,and improve the controlling accuracy and passing rate of targets such as draw resistance and hardness.
2011, 26(5)
:88-91,111.
doi: 10.3969/j.issn.1004-1478.2011.05.022
Abstract:
The adsorption efficiency of carbonyls of different structure properties activated carbons were tested,the influence of carbon structure and compounds properties on the adsorption efficiency was discussed.The results showed that: 1)Surface area and micropore volume were the main factors influencing the adsorption efficiency.With the fixed carbon weights,adsorption efficiency increased with the increasing surface area and micropore volume.2)Adsorption efficiency was affected by carbon pore distributions.In the gas adsorption,micropores are contributed to the adsorption straightly,while mesopores and macropores acted as transport pores,providing routes into the adsorbing material;adsorption efficiency could be maximized by a combination of micropores and meso/macropores.3)As long as the filter pressure drop wasn't too high and considering the processing feasibility,carbon particle size could be small enough.4)Adsorption efficiency had something to do with compounds characteristics,especially with compounds' molecular weight and boiling point.When transportation wasn't limited,compounds with higher boiling points had the higher adsorption efficiency.
The adsorption efficiency of carbonyls of different structure properties activated carbons were tested,the influence of carbon structure and compounds properties on the adsorption efficiency was discussed.The results showed that: 1)Surface area and micropore volume were the main factors influencing the adsorption efficiency.With the fixed carbon weights,adsorption efficiency increased with the increasing surface area and micropore volume.2)Adsorption efficiency was affected by carbon pore distributions.In the gas adsorption,micropores are contributed to the adsorption straightly,while mesopores and macropores acted as transport pores,providing routes into the adsorbing material;adsorption efficiency could be maximized by a combination of micropores and meso/macropores.3)As long as the filter pressure drop wasn't too high and considering the processing feasibility,carbon particle size could be small enough.4)Adsorption efficiency had something to do with compounds characteristics,especially with compounds' molecular weight and boiling point.When transportation wasn't limited,compounds with higher boiling points had the higher adsorption efficiency.
2011, 26(5)
:92-95.
doi: 10.3969/j.issn.1004-1478.2011.05.023
Abstract:
In order to examine the effects of vacuum conditioning on tobacco cigarette process color and the inner quality,in threshing and redrying and the silk processing,the cross-comparative analysis of the same flue-cured tobacco leaf were carried out with or without going through vacuum conditioning.The results showed that tobacco color was darker,but tobacco yellow pigment and polyphenol content were reduced with the increase of processing intensity.Compared with leaves without vacuum conditioning,with adding vacuum conditioned in the silk processing,smoke concentration somewhat increased and the quantity of flavor was good,the inner quality was better.But tobacco smoking quality decreased after two vacuum conditioning.
In order to examine the effects of vacuum conditioning on tobacco cigarette process color and the inner quality,in threshing and redrying and the silk processing,the cross-comparative analysis of the same flue-cured tobacco leaf were carried out with or without going through vacuum conditioning.The results showed that tobacco color was darker,but tobacco yellow pigment and polyphenol content were reduced with the increase of processing intensity.Compared with leaves without vacuum conditioning,with adding vacuum conditioned in the silk processing,smoke concentration somewhat increased and the quantity of flavor was good,the inner quality was better.But tobacco smoking quality decreased after two vacuum conditioning.
2011, 26(5)
:96-99.
doi: 10.3969/j.issn.1004-1478.2011.05.024
Abstract:
The application research statuses of ultrasound extraction (UE) in tobacco component separation were summarized.The advantages of UE were rapidity,inexpensiveness,safety and high efficiency,it was extensively used to component separation such as nicotine,solanesol,chlorogenic acid,phenols,carotenoid,trace elements and pesticide residue.The future research may focus on soaking time,ultrasonic power,ultrasonic frequency for extraction tobacco component separation because UE have an important impact on tobacco component separation.
The application research statuses of ultrasound extraction (UE) in tobacco component separation were summarized.The advantages of UE were rapidity,inexpensiveness,safety and high efficiency,it was extensively used to component separation such as nicotine,solanesol,chlorogenic acid,phenols,carotenoid,trace elements and pesticide residue.The future research may focus on soaking time,ultrasonic power,ultrasonic frequency for extraction tobacco component separation because UE have an important impact on tobacco component separation.
2011, 26(5)
:100-104.
doi: 10.3969/j.issn.1004-1478.2011.05.025
Abstract:
Standard tensile specimens made from carbon black (CB) and polypropylene (PP) were prepared under different injection processing conditions.The injection specimen was cut off along the surface to analyse the microstructure at different position and the resistivity was measured.Experimental results showed that CB nano-particles may form better conductive path under the higher packing pressure.Higher injection pressure may cause disadvantage effect on conductive property of the part.CB was distributed in the form of aggregates similar to grapes in the composites.Compared with injection molded PP polymer under the same processing conditions,CB particle/polymer composites form strong oriented microstructure at central zones of the part due to CB particles' migration.
Standard tensile specimens made from carbon black (CB) and polypropylene (PP) were prepared under different injection processing conditions.The injection specimen was cut off along the surface to analyse the microstructure at different position and the resistivity was measured.Experimental results showed that CB nano-particles may form better conductive path under the higher packing pressure.Higher injection pressure may cause disadvantage effect on conductive property of the part.CB was distributed in the form of aggregates similar to grapes in the composites.Compared with injection molded PP polymer under the same processing conditions,CB particle/polymer composites form strong oriented microstructure at central zones of the part due to CB particles' migration.
2011, 26(5)
:105-106,116.
doi: 10.3969/j.issn.1004-1478.2011.05.026
Abstract:
A synthesis method was developed for preparing benzimidazoles by condensation of 1,2-phenylenediamine with aldehydes promoted by iodine.It has the advantages of simple equipment,easy to operate,mild conditions,lower reaction time and good yield (73~78%).
A synthesis method was developed for preparing benzimidazoles by condensation of 1,2-phenylenediamine with aldehydes promoted by iodine.It has the advantages of simple equipment,easy to operate,mild conditions,lower reaction time and good yield (73~78%).
2011, 26(5)
:107-111.
doi: 10.3969/j.issn.1004-1478.2011.05.027
Abstract:
In recent years,mesoporous materials have been widely used for the adsorption of CO2 in air and industrial exhaust gases because of their advantages such as extra-high specific surface area and regular pore diameters.The traditional solid adsorbents such as activated carbon,sllica gel,zeolite have advantages inculding simple perparation,mature technique and low cost,they are preferred materials,but they can't be used to high humidity adsorption environment due to high hygroscopicity,while through surface modification and stem grafting alkaline substance such as amine for traditional mesoporous materials,It will change the adsorption pattern from simple physical adsorption to physicochemical adsorption,thus it improve ability to adapt to the enivronment for adsorbent and also increase adsorption capacity.The future research field will focus on developing on complex adsorbent with optimum structure and steady physicochemical property.
In recent years,mesoporous materials have been widely used for the adsorption of CO2 in air and industrial exhaust gases because of their advantages such as extra-high specific surface area and regular pore diameters.The traditional solid adsorbents such as activated carbon,sllica gel,zeolite have advantages inculding simple perparation,mature technique and low cost,they are preferred materials,but they can't be used to high humidity adsorption environment due to high hygroscopicity,while through surface modification and stem grafting alkaline substance such as amine for traditional mesoporous materials,It will change the adsorption pattern from simple physical adsorption to physicochemical adsorption,thus it improve ability to adapt to the enivronment for adsorbent and also increase adsorption capacity.The future research field will focus on developing on complex adsorbent with optimum structure and steady physicochemical property.
2011, 26(5)
:112-116.
doi: 10.3969/j.issn.1004-1478.2011.05.028
Abstract:
Based on the concept of packet sets(P-sets),according to the random characteristics of element transfer,the concept of random P-sets and random inclusion degree are proposed,and the P-sets random generation is obtained.Combining the probabilistic characteristics of element transfer,the random characteristics of random P-sets are discussed.The existing background is explained and its applications of image security transfer are given with the illustration of examples.
Based on the concept of packet sets(P-sets),according to the random characteristics of element transfer,the concept of random P-sets and random inclusion degree are proposed,and the P-sets random generation is obtained.Combining the probabilistic characteristics of element transfer,the random characteristics of random P-sets are discussed.The existing background is explained and its applications of image security transfer are given with the illustration of examples.
2011, 26(5)
:117-120.
doi: 10.3969/j.issn.1004-1478.2011.05.029
Abstract:
The analytic evaluation method is used based on the combination of qualitative judgment and quantitative calculation,the genetic algorithm is also employed by using combinatorial optimization and function optimization.Analytical hierarchy process is adjusted and the consistency is judged effectively.The paper provides scientific and rational aprroach for better evaluation of graduation designs.
The analytic evaluation method is used based on the combination of qualitative judgment and quantitative calculation,the genetic algorithm is also employed by using combinatorial optimization and function optimization.Analytical hierarchy process is adjusted and the consistency is judged effectively.The paper provides scientific and rational aprroach for better evaluation of graduation designs.
2011, 26(5)
:121-124.
doi: 10.3969/j.issn.1004-1478.2011.05.030
Abstract:
The VaR and CVaR model were calibrated using Chinese market data based on Generalized-Hyperbolic distribution and with maximum likelihood method,the empirical and back testing results are presented.The results showed that the introduction of G-H distribution effectivly reduced the failure rate of VaR model,and the higher the percentile,the better the fit result is.It is thus proved that G-H parametric method is a very good VaR and CVaR estimation technique.
The VaR and CVaR model were calibrated using Chinese market data based on Generalized-Hyperbolic distribution and with maximum likelihood method,the empirical and back testing results are presented.The results showed that the introduction of G-H distribution effectivly reduced the failure rate of VaR model,and the higher the percentile,the better the fit result is.It is thus proved that G-H parametric method is a very good VaR and CVaR estimation technique.
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
Deputy Editor-in-Chief：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
