2019 Vol. 34, No. 1
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2019, 34(1)
:1-10.
doi: 10.3969/j.issn.2096-1553.2019.01.001
Abstract:
Mucor M/T was isolated from sufu pehtze. Using Mucor 40899 and Mucor M/T as mixed starters, the pre-fermentation process of Sufu was studied through single factors and response surface optimization method. Then, the changes of amino acid nitrogen, texture and chromaticity of Sufu fermented by mixed strains were studied under the optimal pre-fermentation conditions. The results showed that Mucor M/T was identified as the Actinomucor. The optimal pre-fermentation conditions were as follows: fermentation time was 60 h, strain quality ratio of Mucor 40899 and Mucor M/T was 1:1, pH value was 3.5. Under the optimal conditions, the protease activity reached 48.015 U/mL. After post-fermentation of 30 d, the content of amino acid nitrogen in Sufu was 0.53 g/(100 g), which met the mature standard in the industry standard of Sufu. The texture, adhesion and elasticity of Sufu were good. The color difference value was close to that of commercially mature fermented Sufu.
Mucor M/T was isolated from sufu pehtze. Using Mucor 40899 and Mucor M/T as mixed starters, the pre-fermentation process of Sufu was studied through single factors and response surface optimization method. Then, the changes of amino acid nitrogen, texture and chromaticity of Sufu fermented by mixed strains were studied under the optimal pre-fermentation conditions. The results showed that Mucor M/T was identified as the Actinomucor. The optimal pre-fermentation conditions were as follows: fermentation time was 60 h, strain quality ratio of Mucor 40899 and Mucor M/T was 1:1, pH value was 3.5. Under the optimal conditions, the protease activity reached 48.015 U/mL. After post-fermentation of 30 d, the content of amino acid nitrogen in Sufu was 0.53 g/(100 g), which met the mature standard in the industry standard of Sufu. The texture, adhesion and elasticity of Sufu were good. The color difference value was close to that of commercially mature fermented Sufu.
2019, 34(1)
:11-20.
doi: 10.3969/j.issn.2096-1553.2019.01.002
Abstract:
The microorganism SGC-2 with high yield of dextran glycosidase was screened from sugarcane soil using nutrient-deficient medium and transparent circle method. The microorganism SGC-2 was identified according to its morphology and 16S rDNA gene sequence analysis. Moreover, the conditions of fermentation and enzyme production were further optimized. The results showed that the microorganism SGC-2 was Bacillus megatherium. The optimum conditions for enzyme production were as follows: dextran T2000 20 g/L, beef extract 10 g/L, NaCl 4 g/L, MgSO4 0.4 g/L, inoculation time 36 h, inoculation volume 3%, fermentation time 96 h. Under this condition, the activity of dextran anhydrase reached 28.32 U/mL, which increased by 151% when compared with that before optimization. The dextran anhydrase-producing strain was firstly reported, which provided a theoretical basis for screening high-yield dextran microorganisms.
The microorganism SGC-2 with high yield of dextran glycosidase was screened from sugarcane soil using nutrient-deficient medium and transparent circle method. The microorganism SGC-2 was identified according to its morphology and 16S rDNA gene sequence analysis. Moreover, the conditions of fermentation and enzyme production were further optimized. The results showed that the microorganism SGC-2 was Bacillus megatherium. The optimum conditions for enzyme production were as follows: dextran T2000 20 g/L, beef extract 10 g/L, NaCl 4 g/L, MgSO4 0.4 g/L, inoculation time 36 h, inoculation volume 3%, fermentation time 96 h. Under this condition, the activity of dextran anhydrase reached 28.32 U/mL, which increased by 151% when compared with that before optimization. The dextran anhydrase-producing strain was firstly reported, which provided a theoretical basis for screening high-yield dextran microorganisms.
2019, 34(1)
:21-26,63.
doi: 10.3969/j.issn.2096-1553.2019.01.003
Abstract:
Three vegetables of thistle, patchouli and fennel in same growing condition were collected, pretreated by microwave digestion and determined for contents of K, Ca, Mg and Pb by atomic absorption spectrometry method. The results showed that the stems and leaves of three vegetables contained abundant K, Ca and Mg. Moreover, a certain amount of Pb was also detected in whole plants of three vegetables. The enrichment characteristics of four elements across different parts of three vegetables were specific. In that, the element K was preferentially accumulated in stem of thistle and patchouli and leaf of fennel. By contrast, the Ca and Mg were preferentially accumulated in leaves of thistle, patchouli and fennel.In daily life, people can choose vegetables according to their different requirements based on the different trace elements and mineral elements in different vegetables to keep balance of trace elements in body and keep health.
Three vegetables of thistle, patchouli and fennel in same growing condition were collected, pretreated by microwave digestion and determined for contents of K, Ca, Mg and Pb by atomic absorption spectrometry method. The results showed that the stems and leaves of three vegetables contained abundant K, Ca and Mg. Moreover, a certain amount of Pb was also detected in whole plants of three vegetables. The enrichment characteristics of four elements across different parts of three vegetables were specific. In that, the element K was preferentially accumulated in stem of thistle and patchouli and leaf of fennel. By contrast, the Ca and Mg were preferentially accumulated in leaves of thistle, patchouli and fennel.In daily life, people can choose vegetables according to their different requirements based on the different trace elements and mineral elements in different vegetables to keep balance of trace elements in body and keep health.
2019, 34(1)
:27-35.
doi: 10.3969/j.issn.2096-1553.2019.01.004
Abstract:
In order to reduce the content of pectin in reconstituted tobacco, the degradation process of pectin by pectinase of Penicillium janthinellum was optimized by single factor method and orthogonal design. Then the pyrolysis products of samples prior to and after enzymatic hydrolysis were analyzed.Moreover, the enzymatic hydrolysis samples were added to the cigarette for sensory evaluation. The results showed that the optimum conditions for pectin degradation by pectinase of penicillum janthinellum were as follows:enzyme activity 3000 U/mL, the ratio of liquid to solid 1:1, reaction temperature 50℃, treatment time 3 h. Under this condition, the degradation rate of pectin reached 28.63%.After enzymolysis, the molecular weight of pectin reduced from 341 kDa to 55 kDa. The composition and content of pyrolysis products changed obviously.Besides alcohols substance, other flavor components decreased such as phenols, aldehydes and ketones, esters and heterocyclic.When the enzymatic hydrolysis samples were added to the cigarette, the aroma of cigarette sucking was rich and delicate, the penetration and sweetness increased, the irritation decreased and the aftertaste was pure and comfortable, thereby improving the quality of cigarette sucking with slightly weak strength.
In order to reduce the content of pectin in reconstituted tobacco, the degradation process of pectin by pectinase of Penicillium janthinellum was optimized by single factor method and orthogonal design. Then the pyrolysis products of samples prior to and after enzymatic hydrolysis were analyzed.Moreover, the enzymatic hydrolysis samples were added to the cigarette for sensory evaluation. The results showed that the optimum conditions for pectin degradation by pectinase of penicillum janthinellum were as follows:enzyme activity 3000 U/mL, the ratio of liquid to solid 1:1, reaction temperature 50℃, treatment time 3 h. Under this condition, the degradation rate of pectin reached 28.63%.After enzymolysis, the molecular weight of pectin reduced from 341 kDa to 55 kDa. The composition and content of pyrolysis products changed obviously.Besides alcohols substance, other flavor components decreased such as phenols, aldehydes and ketones, esters and heterocyclic.When the enzymatic hydrolysis samples were added to the cigarette, the aroma of cigarette sucking was rich and delicate, the penetration and sweetness increased, the irritation decreased and the aftertaste was pure and comfortable, thereby improving the quality of cigarette sucking with slightly weak strength.
2019, 34(1)
:36-42.
doi: 10.3969/j.issn.2096-1553.2019.01.005
Abstract:
The white rot fungus (P.Chrysosporium) was subjected to continuous subcultivation and domestication to improve the nicotine tolerance of the fungus. The degradation efficiency of lignin in tobacco stem was compared between artificial aging and liquid fermentation to obtain the optimal fermentation conditions. The results showed that the domesticated white rot fungi was effectively planted on tobacco stems. The content of lignin in tobacco stems reached 1.93%, decreasing by 23.11% after 24 h of liquid fermentation under the optimum fermentation conditions of 34 ℃ and 6% inoculation, which was comparable to the degradation of lignin in tobacco stems after three months of artificial aging.The content of total sugar and glucose increased 10.84% and 4.86% respectively, which eliminated the unpleasant odor of protein burning to certain extent and improved the wood gas in tobacco stem burning.
The white rot fungus (P.Chrysosporium) was subjected to continuous subcultivation and domestication to improve the nicotine tolerance of the fungus. The degradation efficiency of lignin in tobacco stem was compared between artificial aging and liquid fermentation to obtain the optimal fermentation conditions. The results showed that the domesticated white rot fungi was effectively planted on tobacco stems. The content of lignin in tobacco stems reached 1.93%, decreasing by 23.11% after 24 h of liquid fermentation under the optimum fermentation conditions of 34 ℃ and 6% inoculation, which was comparable to the degradation of lignin in tobacco stems after three months of artificial aging.The content of total sugar and glucose increased 10.84% and 4.86% respectively, which eliminated the unpleasant odor of protein burning to certain extent and improved the wood gas in tobacco stem burning.
2019, 34(1)
:43-50.
doi: 10.3969/j.issn.2096-1553.2019.01.006
Abstract:
In order to study the influence of filter parameters on the release of 5 kinds of key roasted sweet aromas in mainstream smoke of fine cigarettes, 60 fine branches with different tow specifications, different filter plug pressure drops and different filter ventilations were prepared, and the release of 5 kinds of key roasted sweet aromas in mainstream smoke was analyzed.The results showed that: 1) The difference between the release of sterol and 5-methyl sterol in the mainstream smoke of fine cigarettes in different tow specifications reached a very significant or significant level, and the difference among the release of 3-methyl-2-cyclopenten-1-one, strawberry furanone, maltol and the total release of these 5 kinds of key roasted sweet aromas in different tow specifications were not significant.The comparison results showed that fine cigarettes with 11.0Y/15000 tow had higher sterol and 5-methyl sterol release; 2) As the pressure drop of the filter rod rose, the total release of the 5 kinds of key roasted sweet aromas in mainstream smoke showed a decreasing trend; 3) With the increase of filter ventilation, the total release of 5 kinds of key roasted sweet aromas in mainstream smoke increased first and then decreased.
In order to study the influence of filter parameters on the release of 5 kinds of key roasted sweet aromas in mainstream smoke of fine cigarettes, 60 fine branches with different tow specifications, different filter plug pressure drops and different filter ventilations were prepared, and the release of 5 kinds of key roasted sweet aromas in mainstream smoke was analyzed.The results showed that: 1) The difference between the release of sterol and 5-methyl sterol in the mainstream smoke of fine cigarettes in different tow specifications reached a very significant or significant level, and the difference among the release of 3-methyl-2-cyclopenten-1-one, strawberry furanone, maltol and the total release of these 5 kinds of key roasted sweet aromas in different tow specifications were not significant.The comparison results showed that fine cigarettes with 11.0Y/15000 tow had higher sterol and 5-methyl sterol release; 2) As the pressure drop of the filter rod rose, the total release of the 5 kinds of key roasted sweet aromas in mainstream smoke showed a decreasing trend; 3) With the increase of filter ventilation, the total release of 5 kinds of key roasted sweet aromas in mainstream smoke increased first and then decreased.
2019, 34(1)
:51-56.
doi: 10.3969/j.issn.2096-1553.2019.01.007
Abstract:
A sunscreen nanomaterial SiO2-KH550/TiO2 was prepared by using rutile TiO2 as carrier and KH550 as coupling agent by inorganic coating and organic grafting. Its hydrophilic, lipophilic and photocatalytic properties were investigated. The results showed that SiO2-KH550/TiO2 had good lipophilicity and could be well dispersed in the oil phase with good stability. After 6 h photodegradation, the degradation rate of methylene blue was only 17%, and the photocatalytic activity of TiO2 was obviously reduced. The material could solve the problem that TiO2 was easy to separate and settle in the oil phase system sunscreen cosmetics, and avoided the damage of epidermal cells caused by the photocatalytic activity of TiO2 during the use of the product.
A sunscreen nanomaterial SiO2-KH550/TiO2 was prepared by using rutile TiO2 as carrier and KH550 as coupling agent by inorganic coating and organic grafting. Its hydrophilic, lipophilic and photocatalytic properties were investigated. The results showed that SiO2-KH550/TiO2 had good lipophilicity and could be well dispersed in the oil phase with good stability. After 6 h photodegradation, the degradation rate of methylene blue was only 17%, and the photocatalytic activity of TiO2 was obviously reduced. The material could solve the problem that TiO2 was easy to separate and settle in the oil phase system sunscreen cosmetics, and avoided the damage of epidermal cells caused by the photocatalytic activity of TiO2 during the use of the product.
2019, 34(1)
:57-63.
doi: 10.3969/j.issn.2096-1553.2019.01.008
Abstract:
The nonionic surfactant fatty alcohol polyoxyethylene ether (AEO9) was selected with the compound of three commonly used anionic surfactants (sodium lauryl ether sulfate (AES), sodium linear alkylbenzene sulfonate (LAS) and sodium dodecyl sulfate (K12) to prepare a de-staining liquid with surfactant and hydrogen peroxide as main decontaminating ingredients. The effect of surfactant type, dosage and hydrogen peroxide dosage on decontamination of de-staining liquid was studied, and its stability was investigated. Compared with similar hot products in the market from two aspects of the detergency and whether it caused the fading of colored fabrics, the results showed that: the best formula for de-staining liquid was 30% (If there was no specific reference, it refered to the quality score.),hydrogen peroxide (6.0%), K12 (0.468 3%), AEO9 (0.041 7%), 95% ethanol (9.0%), disodium EDTA (1.5%), flavor (appropriate amount), citric acid (appropriate amount) and deionized water (added to 100%); The de-staining solution prepared according to the formula was left for 1 week, the decontamination effect did not change significantly, and it was always a colorless and transparent solution with no delamination and good stability. The ability of the decontamination spray to remove orange juice and coffee was slightly stronger that of Beckman decontamination pen, the ability to remove tomato juice and vegetable juice was slightly weaker,when it was used to the fabric color decontamination.It would not cause more obvious fading,but Beckman decontamination pen would cause more obvious fading.
The nonionic surfactant fatty alcohol polyoxyethylene ether (AEO9) was selected with the compound of three commonly used anionic surfactants (sodium lauryl ether sulfate (AES), sodium linear alkylbenzene sulfonate (LAS) and sodium dodecyl sulfate (K12) to prepare a de-staining liquid with surfactant and hydrogen peroxide as main decontaminating ingredients. The effect of surfactant type, dosage and hydrogen peroxide dosage on decontamination of de-staining liquid was studied, and its stability was investigated. Compared with similar hot products in the market from two aspects of the detergency and whether it caused the fading of colored fabrics, the results showed that: the best formula for de-staining liquid was 30% (If there was no specific reference, it refered to the quality score.),hydrogen peroxide (6.0%), K12 (0.468 3%), AEO9 (0.041 7%), 95% ethanol (9.0%), disodium EDTA (1.5%), flavor (appropriate amount), citric acid (appropriate amount) and deionized water (added to 100%); The de-staining solution prepared according to the formula was left for 1 week, the decontamination effect did not change significantly, and it was always a colorless and transparent solution with no delamination and good stability. The ability of the decontamination spray to remove orange juice and coffee was slightly stronger that of Beckman decontamination pen, the ability to remove tomato juice and vegetable juice was slightly weaker,when it was used to the fabric color decontamination.It would not cause more obvious fading,but Beckman decontamination pen would cause more obvious fading.
2019, 34(1)
:64-70.
doi: 10.3969/j.issn.2096-1553.2019.01.009
Abstract:
The attapulgite modified by H2SO4 was used as a solid acid catalyst to study the dehydration of the bio-based platform compound 5-hydroxymethylfurfural (HMF). The results showed that the Bronsted acid sites increased when the attapulgite was modified by different concentrations of H2SO4. When the concentration of H2SO4 was 1.0 mol/L, there were more Bronsted acid sites and Lewis acid sites. The preparation of HMF had the best effect, and the yield could reach 46.6%. The catalyst showed good stability in the aqueous system.Repeated use of the catalyst for 4 times, the HMF yield was above 46%, and the activity did not change significantly.
The attapulgite modified by H2SO4 was used as a solid acid catalyst to study the dehydration of the bio-based platform compound 5-hydroxymethylfurfural (HMF). The results showed that the Bronsted acid sites increased when the attapulgite was modified by different concentrations of H2SO4. When the concentration of H2SO4 was 1.0 mol/L, there were more Bronsted acid sites and Lewis acid sites. The preparation of HMF had the best effect, and the yield could reach 46.6%. The catalyst showed good stability in the aqueous system.Repeated use of the catalyst for 4 times, the HMF yield was above 46%, and the activity did not change significantly.
2019, 34(1)
:71-78,100.
doi: 10.3969/j.issn.2096-1553.2019.01.010
Abstract:
In order to improve the design strength and fatigue life of the automobile rear axle housing and further improve the vehicle performance, ADAMS was used to establish the vehicle dynamics simulation model,finite element mesh generation was made by combining the three-dimensional model of axle housing material and unit type.ABAQUS was used to carry out finite element statics analysis of the automobile rear axle housing according to Bump working condition, and response surface approximation model was used to optimize the automobile rear axle housing. The results showed that the maximum stress of the rear axle shell under extreme conditions of Bump was reduced by about 10% and the fatigue life was prolonged by about 17%.
In order to improve the design strength and fatigue life of the automobile rear axle housing and further improve the vehicle performance, ADAMS was used to establish the vehicle dynamics simulation model,finite element mesh generation was made by combining the three-dimensional model of axle housing material and unit type.ABAQUS was used to carry out finite element statics analysis of the automobile rear axle housing according to Bump working condition, and response surface approximation model was used to optimize the automobile rear axle housing. The results showed that the maximum stress of the rear axle shell under extreme conditions of Bump was reduced by about 10% and the fatigue life was prolonged by about 17%.
2019, 34(1)
:79-86.
doi: 10.3969/j.issn.2096-1553.2019.01.011
Abstract:
In order to solve the problem of loud noise of automobile braking, taking a certain electric vehicle disc brake was the research object, a 3D model of the brake was established by using Soildworks software, and the model was analyzed by complex modal analysis on Workbench platform, and the distribution of vibration and noise during braking was obtained. The structure of the brake pad was optimized by means of chamfered, digging grooves in the middle and riveting the shim in the steel back. Finally, the NVH performance test of the brake before and after the improvement carried out using the Dynamometer-GIANT 8600 inertia test bench. The experimental results showed that the lower the friction coefficient,the smaller the real part value of the complex eigenvalue of the brake, and more stable the system. The improved brake could effectively reduce the frequency of the unstable modes of the system, so that the braking noise of the vehicle was significantly reduced at low speed, and the NVH performance of the brake was significantly improved.
In order to solve the problem of loud noise of automobile braking, taking a certain electric vehicle disc brake was the research object, a 3D model of the brake was established by using Soildworks software, and the model was analyzed by complex modal analysis on Workbench platform, and the distribution of vibration and noise during braking was obtained. The structure of the brake pad was optimized by means of chamfered, digging grooves in the middle and riveting the shim in the steel back. Finally, the NVH performance test of the brake before and after the improvement carried out using the Dynamometer-GIANT 8600 inertia test bench. The experimental results showed that the lower the friction coefficient,the smaller the real part value of the complex eigenvalue of the brake, and more stable the system. The improved brake could effectively reduce the frequency of the unstable modes of the system, so that the braking noise of the vehicle was significantly reduced at low speed, and the NVH performance of the brake was significantly improved.
2019, 34(1)
:87-93.
doi: 10.3969/j.issn.2096-1553.2019.01.012
Abstract:
Aiming at the problem of high vibration and noise caused by unstable meshing of driving chain in the actual working condition of power turret, based on the theory of non-linear dynamics and virtual prototyping technology, taking AK33125 power tool holder as the research object, a 6-level and 7-gear driving dynamic model of tool driving module is established. The dynamics of tool driving transmission chain was studied, and the dynamic response of relevant parameters to transmission chain was analyzed.The results showed that proper damping between gear pairs could improve the stability of transmission chain; smaller load torque could reduce the amplitude and frequency of speed fluctuation of transmission chain; the frequency and amplitude of speed fluctuation of transmission chain would increase with the increase of input speed of motor gear.In actual working conditions, the vibration noise of tool holder can be reduced by changing lubrication modes properly to increase meshing damping between transmission chain gears, adding cutting fluid to reduce cutting load properly and reducing motor speed properly without affecting cutting efficiency.
Aiming at the problem of high vibration and noise caused by unstable meshing of driving chain in the actual working condition of power turret, based on the theory of non-linear dynamics and virtual prototyping technology, taking AK33125 power tool holder as the research object, a 6-level and 7-gear driving dynamic model of tool driving module is established. The dynamics of tool driving transmission chain was studied, and the dynamic response of relevant parameters to transmission chain was analyzed.The results showed that proper damping between gear pairs could improve the stability of transmission chain; smaller load torque could reduce the amplitude and frequency of speed fluctuation of transmission chain; the frequency and amplitude of speed fluctuation of transmission chain would increase with the increase of input speed of motor gear.In actual working conditions, the vibration noise of tool holder can be reduced by changing lubrication modes properly to increase meshing damping between transmission chain gears, adding cutting fluid to reduce cutting load properly and reducing motor speed properly without affecting cutting efficiency.
2019, 34(1)
:94-100.
doi: 10.3969/j.issn.2096-1553.2019.01.013
Abstract:
Aiming at the problem of transmission efficiency change in the wireless power transfer system constant power transmission under different loads, by establishing the SiC dual full bridge wireless power transfer system model, the corresponding relationships between the primary side voltage angle and the transmission power, the secondary side voltage angle and the transmission efficiency were deduced, and the optimization of the constant power transmission efficiency was studied.The results showed that under the condition of variable load, the equivalent load was optimized by adjusting the secondary side voltage angle to maximize the transmission efficiency. The experimental comparison between the dual full bridge structure and the uncontrolled rectifier structure proved that the dual full bridge structure could significantly improve the transmission efficiency. The efficiency was increased by 19% when the transmission power was 100 W at the load of 30 Ω.
Aiming at the problem of transmission efficiency change in the wireless power transfer system constant power transmission under different loads, by establishing the SiC dual full bridge wireless power transfer system model, the corresponding relationships between the primary side voltage angle and the transmission power, the secondary side voltage angle and the transmission efficiency were deduced, and the optimization of the constant power transmission efficiency was studied.The results showed that under the condition of variable load, the equivalent load was optimized by adjusting the secondary side voltage angle to maximize the transmission efficiency. The experimental comparison between the dual full bridge structure and the uncontrolled rectifier structure proved that the dual full bridge structure could significantly improve the transmission efficiency. The efficiency was increased by 19% when the transmission power was 100 W at the load of 30 Ω.
2019, 34(1)
:101-108.
doi: 10.3969/j.issn.2096-1553.2019.01.014
Abstract:
Aiming at the problem of stator winding inter-turn short circuit fault of permanent magnet synchronous generator(PMSG), the fault factor of inter-turn short circuit was introduced based on the analysis of PMSG general mathematical model, and the mathematical model of stator winding inter-turn short circuit fault in three-phase stationary coordinates was derived. In addition, the simulation model based on Matlab/Simulink was established, and the operating conditions of PMSG normal and stator A phase winding inter-turn short circuit under different severity were studied using time-domain simulation and FFT analysis. Simulation results showed that the stator current would increase with the severity of the stator winding inter-turn short circuit fault of PMSG, and when the stator winding short circuit turned to reach a certain number, corresponding stator current amplitude changes would be more obvious.
Aiming at the problem of stator winding inter-turn short circuit fault of permanent magnet synchronous generator(PMSG), the fault factor of inter-turn short circuit was introduced based on the analysis of PMSG general mathematical model, and the mathematical model of stator winding inter-turn short circuit fault in three-phase stationary coordinates was derived. In addition, the simulation model based on Matlab/Simulink was established, and the operating conditions of PMSG normal and stator A phase winding inter-turn short circuit under different severity were studied using time-domain simulation and FFT analysis. Simulation results showed that the stator current would increase with the severity of the stator winding inter-turn short circuit fault of PMSG, and when the stator winding short circuit turned to reach a certain number, corresponding stator current amplitude changes would be more obvious.
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
