Pub Date : 2018-11-27DOI: 10.32508/STDJ.V20IK7.1205
Linh Nguyen, T. T. Nguyen, Trieu Ngoc Ton, A. Truong, X. Nguyen
This paper presents a method of determining the location and size of distributed generation (DG) considering to operate the configuration of distribution network to minimize the real power loss. The proposed method which is based on the genetic algorithm (GA) is divided into two stages. In the first stage, GA is used to optimize the location and size of DG in the mesh distribution network, while in the second stage, GA is used to determine the radial network configuration after installing DG. The simulation results on the 33-nodes and 69-nodes systems show that the proposed method can be an efficient method for the placing DG problem and that is considering to solve the problem of distribution network reconfiguration.
{"title":"Application of genetic algorithm for problem of optimizing location and capacity of distributed generation considering distributed network reconfiguration","authors":"Linh Nguyen, T. T. Nguyen, Trieu Ngoc Ton, A. Truong, X. Nguyen","doi":"10.32508/STDJ.V20IK7.1205","DOIUrl":"https://doi.org/10.32508/STDJ.V20IK7.1205","url":null,"abstract":"This paper presents a method of determining the location and size of distributed generation (DG) considering to operate the configuration of distribution network to minimize the real power loss. The proposed method which is based on the genetic algorithm (GA) is divided into two stages. In the first stage, GA is used to optimize the location and size of DG in the mesh distribution network, while in the second stage, GA is used to determine the radial network configuration after installing DG. The simulation results on the 33-nodes and 69-nodes systems show that the proposed method can be an efficient method for the placing DG problem and that is considering to solve the problem of distribution network reconfiguration.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114841008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/stdj.v20ik7.1206
B. Phan, Qui Minh Le, C. V. Vo
Demand Response program is applied in many countries as an effective instrument to regulate the electricity consumption. In this program, time of use (TOU) tariff is used widely. Optimal TOU pricing according to different objectives was mentioned in this paper such as peak load reduction, improving load curve, energy conservation, avoiding a new peak load. This is a problem with multiobjective functions in different unit of measurement and is solved by PSO algorithm. An example to find optimal TOU tariff for one utility is also presented in this paper.
{"title":"Optimizing the time of use tariff with different scenarios of load management","authors":"B. Phan, Qui Minh Le, C. V. Vo","doi":"10.32508/stdj.v20ik7.1206","DOIUrl":"https://doi.org/10.32508/stdj.v20ik7.1206","url":null,"abstract":"Demand Response program is applied in many countries as an effective instrument to regulate the electricity consumption. In this program, time of use (TOU) tariff is used widely. Optimal TOU pricing according to different objectives was mentioned in this paper such as peak load reduction, improving load curve, energy conservation, avoiding a new peak load. This is a problem with multiobjective functions in different unit of measurement and is solved by PSO algorithm. An example to find optimal TOU tariff for one utility is also presented in this paper.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128051536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/STDJ.V20IK7.1209
Tam-Dinh Le-Vo, Cuong Tran
In this study, the antioxidant potential of peptide fractions isolated from the Tra catfish (Pangasius hypophthalmus) by-product-derived hydrolysate using ultrafiltration centrifugal devices with 3 distinct molecular-weight cutoffs (MWCOs) of 5KDa, 10KDa, and 30KDa was investigated. Firstly, the chemical composition of the Tra catfish byproducts was analyzed. The result showed that the Tra catfish by-products contained 58.5% moisture, 33.9% crude protein, 50.1% crude lipid and 15.8% ash (on dry weight basis). Secondly, the effects of enzyme content, hydrolysis time on the antioxidant activity of the hydrolysate were studied using DPPH• (2,2-diphenyl-1-picrylhydrazyl) radical scavenging method (DPPH• SM), and FRAP (ferric reducing antioxidant potential) method. Flavourzyme® 500 MG was used for hydrolysis. The result revealed that the antioxidant activity of the proteolysate reached the peak when the hydrolysis time was 3h, enzyme/substrate (E/S) ratio was 25 U/g protein, hydrolysis temperature was 500C, pH was 7, and the degree of hydrolysis (DH) of the hydrolysate reached 37.4%. Next, the proteolysate was further fractionated using MWCOs of 5KDa, 10KDa, and 30KDa and the peptide fractions were investigated for their antioxidant activity. The result showed that the <5KDa fraction showed strongest antioxidant activity with the 50% DPPH• inhibition concentration (IC50) of 3079.34±75.29 μg/mL and FRAP value of 611.28±4.5 μM Trolox equivalent. The second strongest fraction was 5-10KDa with the IC50 and FRAPS value of 4709.3 ± 222.22 μg/mL and 323.62±2.54 μM Trolox equivalent, respectively. The 10-30KDa fraction showed weakest antioxidant capacity with the IC50 of 5847.73 ± 128.68 μg/mL and FRAP value of 291.4±2.65 μM Trolox equivalent. The antioxidant peptides derived from Tra catfish by-products proteolysate have the potential to be used as natural antioxidant ingredients in pharmaceutical and food industry.
{"title":"Investigation of antioxidant capacity of peptide fractions from the Tra catfish by-product-derived proteolysate using Flavourzyme® 500 mg","authors":"Tam-Dinh Le-Vo, Cuong Tran","doi":"10.32508/STDJ.V20IK7.1209","DOIUrl":"https://doi.org/10.32508/STDJ.V20IK7.1209","url":null,"abstract":"In this study, the antioxidant potential of peptide fractions isolated from the Tra catfish (Pangasius hypophthalmus) by-product-derived hydrolysate using ultrafiltration centrifugal devices with 3 distinct molecular-weight cutoffs (MWCOs) of 5KDa, 10KDa, and 30KDa was investigated. Firstly, the chemical composition of the Tra catfish byproducts was analyzed. The result showed that the Tra catfish by-products contained 58.5% moisture, 33.9% crude protein, 50.1% crude lipid and 15.8% ash (on dry weight basis). Secondly, the effects of enzyme content, hydrolysis time on the antioxidant activity of the hydrolysate were studied using DPPH• (2,2-diphenyl-1-picrylhydrazyl) radical scavenging method (DPPH• SM), and FRAP (ferric reducing antioxidant potential) method. Flavourzyme® 500 MG was used for hydrolysis. The result revealed that the antioxidant activity of the proteolysate reached the peak when the hydrolysis time was 3h, enzyme/substrate (E/S) ratio was 25 U/g protein, hydrolysis temperature was 500C, pH was 7, and the degree of hydrolysis (DH) of the hydrolysate reached 37.4%. Next, the proteolysate was further fractionated using MWCOs of 5KDa, 10KDa, and 30KDa and the peptide fractions were investigated for their antioxidant activity. The result showed that the <5KDa fraction showed strongest antioxidant activity with the 50% DPPH• inhibition concentration (IC50) of 3079.34±75.29 μg/mL and FRAP value of 611.28±4.5 μM Trolox equivalent. The second strongest fraction was 5-10KDa with the IC50 and FRAPS value of 4709.3 ± 222.22 μg/mL and 323.62±2.54 μM Trolox equivalent, respectively. The 10-30KDa fraction showed weakest antioxidant capacity with the IC50 of 5847.73 ± 128.68 μg/mL and FRAP value of 291.4±2.65 μM Trolox equivalent. The antioxidant peptides derived from Tra catfish by-products proteolysate have the potential to be used as natural antioxidant ingredients in pharmaceutical and food industry.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126888741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/stdj.v20ik7.1212
Nguyệt Nữ Minh Tôn, D. Mai, M. Le
Banana stem from a banana farm in Duc Hoa, Long An contained 40.26% of cellulose, 15.60% of hemicellulose and 12.42% lignin. In this study, the effects of H2SO4 or NaOH concentration, temperature, time on pretreatment of banana stem were investigated. The result revealed that NaOH solution showed better effect on the pretreatment compared with H2SO4. The best pretreatment condition included NaOH concentration of 3.0%, temperature of 60 0C and time of 6 hours.
{"title":"Pretreatment of banana stem poweder using acid or base to isolate bioethanol: effects of technological parameters on the yield of the pretreatment","authors":"Nguyệt Nữ Minh Tôn, D. Mai, M. Le","doi":"10.32508/stdj.v20ik7.1212","DOIUrl":"https://doi.org/10.32508/stdj.v20ik7.1212","url":null,"abstract":"Banana stem from a banana farm in Duc Hoa, Long An contained 40.26% of cellulose, 15.60% of hemicellulose and 12.42% lignin. In this study, the effects of H2SO4 or NaOH concentration, temperature, time on pretreatment of banana stem were investigated. The result revealed that NaOH solution showed better effect on the pretreatment compared with H2SO4. The best pretreatment condition included NaOH concentration of 3.0%, temperature of 60 0C and time of 6 hours.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132243666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/stdj.v20ik7.1211
N. Dang, Trinh A. Nguyen, T. Phan, H. Tran, P. V. Dang, H. Nguyen
Silica nanoparticles (SiO2 NPs) were synthesized from rice husk ash (RHA) by chemical treatment and calcination. The size of SiO2 NPs evaluated by transmission electron microscope (TEM) was of 20 - 50 nm and the size distribution of SiO2 NPs measured by dynamic laser scattering (DLS) was of Gaussian mode. The X-ray diffraction (XRD) pattern with only one peak at 2θ ~ 220 confirmed the amorphous phase of SiO2 NPs. The Fourier transform infrared (FTIR) and energydispersive X-ray (EDX) spectra were also used to evaluate the functional groups and the purity of SiO2 NPs. The SiO2 NPs powder with high purity could be suitably produced by calcination of acid treated RHA at 7000C for 2h. The obtained SiO2 NPs product can be potentially used for numerous purposes of application, especially as filler in paints.
{"title":"Synthesis of silica nanoparticles from rice husk ash","authors":"N. Dang, Trinh A. Nguyen, T. Phan, H. Tran, P. V. Dang, H. Nguyen","doi":"10.32508/stdj.v20ik7.1211","DOIUrl":"https://doi.org/10.32508/stdj.v20ik7.1211","url":null,"abstract":"Silica nanoparticles (SiO2 NPs) were synthesized from rice husk ash (RHA) by chemical treatment and calcination. The size of SiO2 NPs evaluated by transmission electron microscope (TEM) was of 20 - 50 nm and the size distribution of SiO2 NPs measured by dynamic laser scattering (DLS) was of Gaussian mode. The X-ray diffraction (XRD) pattern with only one peak at 2θ ~ 220 confirmed the amorphous phase of SiO2 NPs. The Fourier transform infrared (FTIR) and energydispersive X-ray (EDX) spectra were also used to evaluate the functional groups and the purity of SiO2 NPs. The SiO2 NPs powder with high purity could be suitably produced by calcination of acid treated RHA at 7000C for 2h. The obtained SiO2 NPs product can be potentially used for numerous purposes of application, especially as filler in paints.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125152312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/STDJ.V20IK7.1208
A. Phan, N. Le
The stability of colorant powders from Japanese purple sweet potato (Ipomoea batatas (L.) Poir) harvested in Vinh Long province was investigated. The colorants were formed from extracting solutions which were adjusted to pH of 6, 5, 4 and 3 before converted to powder matrix. They had red-purple color and contained anthocyanin concentration of about 32 mg/g. The IC50 inhibitory concentration of the neutral powder was 292.7 μg/mL, whereas the IC50 of pH3 powder was 484 μg/mL, which antioxidant activity decreased by increasing of acidic media clearly. Stability of appearance colors, anthocyanin content, polyanthocyanin index and antioxidant capacity were investigated and they depended on storing conditions (temperature and radiation) and pH media. To avoid denaturation of anthocyanin content, the pigment should be stored in the dark and at low temperature (10 °C). The acidic media could preserve the colorant powder by protecting anthocyanins, but it reduced the biological property of the pigment.
{"title":"Investigation of stability of colorant powders extracting from Japanese purple sweet potato (Ipomoea batatas (L.) Poir)","authors":"A. Phan, N. Le","doi":"10.32508/STDJ.V20IK7.1208","DOIUrl":"https://doi.org/10.32508/STDJ.V20IK7.1208","url":null,"abstract":"The stability of colorant powders from Japanese purple sweet potato (Ipomoea batatas (L.) Poir) harvested in Vinh Long province was investigated. The colorants were formed from extracting solutions which were adjusted to pH of 6, 5, 4 and 3 before converted to powder matrix. They had red-purple color and contained anthocyanin concentration of about 32 mg/g. The IC50 inhibitory concentration of the neutral powder was 292.7 μg/mL, whereas the IC50 of pH3 powder was 484 μg/mL, which antioxidant activity decreased by increasing of acidic media clearly. Stability of appearance colors, anthocyanin content, polyanthocyanin index and antioxidant capacity were investigated and they depended on storing conditions (temperature and radiation) and pH media. To avoid denaturation of anthocyanin content, the pigment should be stored in the dark and at low temperature (10 °C). The acidic media could preserve the colorant powder by protecting anthocyanins, but it reduced the biological property of the pigment.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"575 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122778295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/STDJ.V20IK7.1214
H. T. Le, H. M. Son, H. Tran, G. Le
Lower basin of Sai Gon – Dong Nai river is lowland. It’s inundated at high tide. Using mathematical model method with the integrated 1D2D model, the inundation hazard due to the high tide in this region has been evaluated through the inundated area. The calculation results also showed that in the case when the damping ability of Can Gio forest is disabled high water level at Nha Be and Phu An can be increased about 2 – 3 cm and the effect will be stronger in the future following the sea level rise. In the case the Can Gio forest is diked to create a reservoir with reasonable in- and outflow directions, the high water level at Nha Be and Phu An can be decreased about 10 - 11 cm and the effect will be stronger in the future following the sea level rise. This water level decrease effect almost compensates the water level increase due to the sea level rise and keeps the maximum water level at Phu An not exceed actual one until 2050 regardless the sea level rise.
{"title":"Inundation due to the tide in the context of sea level rise and the role of Can-Gio forest in the reduction of inundation","authors":"H. T. Le, H. M. Son, H. Tran, G. Le","doi":"10.32508/STDJ.V20IK7.1214","DOIUrl":"https://doi.org/10.32508/STDJ.V20IK7.1214","url":null,"abstract":"Lower basin of Sai Gon – Dong Nai river is lowland. It’s inundated at high tide. Using mathematical model method with the integrated 1D2D model, the inundation hazard due to the high tide in this region has been evaluated through the inundated area. The calculation results also showed that in the case when the damping ability of Can Gio forest is disabled high water level at Nha Be and Phu An can be increased about 2 – 3 cm and the effect will be stronger in the future following the sea level rise. In the case the Can Gio forest is diked to create a reservoir with reasonable in- and outflow directions, the high water level at Nha Be and Phu An can be decreased about 10 - 11 cm and the effect will be stronger in the future following the sea level rise. This water level decrease effect almost compensates the water level increase due to the sea level rise and keeps the maximum water level at Phu An not exceed actual one until 2050 regardless the sea level rise.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132007090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/STDJ.V20IK7.1210
Hien Luong Thi Nguyen, Minh Tang, D. Doan, V. Le
In this study, peanut protein concentrate (PPC) was substituted for soy protein concentrate (SPC) in Vietnam emulsion-type sausage manufacture. Peanut protein concentrates yielded from the conventional and the combined ultrasonic and enzymatic extraction were used in the preparation of sausage samples PPC1 and PPC2, respectively. Soy protein concentrate was used in the sausage sample SPC as a control. Ten sausage samples including PPC1, PPC2, SPC and seven commercial samples in which soy protein (SP) was used were tested in three experiments. Instrumental Texture Profile Analysis (TPA), Flash Profile, and 9- point hedonic scale were conducted to observe sample differences. The instrumental TPA results indicated that PPC1 and PPC2 were insignificantly different from the control and one of the SP-added samples for hardness, springiness, and adhesiveness; but significantly for cohesiveness. In the first two sensory dimensions, assessors discriminated samples into three distinct directions in which PPC1 and PPC2 were positioned closely to SPC and two commercial SP-added sausages. Preference map further showed the same percentage of satisfied consumers - clustered with partial least square (PLS) regression - toward PPC1, PPC2, SPC, and the two commercial SP-added sausages. In general, the results proposed the potential use of PPC as a substitute for SP in Vietnam emulsion-type sausage production.
{"title":"Substitution of peanut protein for soy protein as a non-meat binder in emulsion-type sausage production","authors":"Hien Luong Thi Nguyen, Minh Tang, D. Doan, V. Le","doi":"10.32508/STDJ.V20IK7.1210","DOIUrl":"https://doi.org/10.32508/STDJ.V20IK7.1210","url":null,"abstract":"In this study, peanut protein concentrate (PPC) was substituted for soy protein concentrate (SPC) in Vietnam emulsion-type sausage manufacture. Peanut protein concentrates yielded from the conventional and the combined ultrasonic and enzymatic extraction were used in the preparation of sausage samples PPC1 and PPC2, respectively. Soy protein concentrate was used in the sausage sample SPC as a control. Ten sausage samples including PPC1, PPC2, SPC and seven commercial samples in which soy protein (SP) was used were tested in three experiments. Instrumental Texture Profile Analysis (TPA), Flash Profile, and 9- point hedonic scale were conducted to observe sample differences. The instrumental TPA results indicated that PPC1 and PPC2 were insignificantly different from the control and one of the SP-added samples for hardness, springiness, and adhesiveness; but significantly for cohesiveness. In the first two sensory dimensions, assessors discriminated samples into three distinct directions in which PPC1 and PPC2 were positioned closely to SPC and two commercial SP-added sausages. Preference map further showed the same percentage of satisfied consumers - clustered with partial least square (PLS) regression - toward PPC1, PPC2, SPC, and the two commercial SP-added sausages. In general, the results proposed the potential use of PPC as a substitute for SP in Vietnam emulsion-type sausage production.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132374882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-11-27DOI: 10.32508/STDJ.V20IK7.1213
D. T. Tran, Q. Pham, Thong Nguyen, T. Bui, T. V. Tran
Solute diffusion is a key process in many fields like for example material science or environmental engineering. Diffusion mechanism in porous media is often described by Fick’s law. However, we could not use this law for nonstandard diffusion behaviors occurring in cases of heterogeneous media. The conception of double-porosity medium can be applied to a class of such media. The double-porosity medium is characterized by two distinct pore sizes: macro-porosity domain and micro-porosity domain, respectively, having the contrasted hydraulic properties. This paper presents the development of a macroscopic model for the solute diffusion in unsaturated double-porosity medium, by using homogenization method. The obtained macroscopic model is a system of two equations coupling on the interface of the macro- and micro-porosity domain for diffusion. This model contains the effective diffusion tensor representing for the entire medium. The developed model is verified by comparing with the reference solution of the fine scale model through a 3D numerical example of hydrogeology problem.
{"title":"A model of solute diffusion in unsaturated double-porosity medium by homogenization","authors":"D. T. Tran, Q. Pham, Thong Nguyen, T. Bui, T. V. Tran","doi":"10.32508/STDJ.V20IK7.1213","DOIUrl":"https://doi.org/10.32508/STDJ.V20IK7.1213","url":null,"abstract":"Solute diffusion is a key process in many fields like for example material science or environmental engineering. Diffusion mechanism in porous media is often described by Fick’s law. However, we could not use this law for nonstandard diffusion behaviors occurring in cases of heterogeneous media. The conception of double-porosity medium can be applied to a class of such media. The double-porosity medium is characterized by two distinct pore sizes: macro-porosity domain and micro-porosity domain, respectively, having the contrasted hydraulic properties. This paper presents the development of a macroscopic model for the solute diffusion in unsaturated double-porosity medium, by using homogenization method. The obtained macroscopic model is a system of two equations coupling on the interface of the macro- and micro-porosity domain for diffusion. This model contains the effective diffusion tensor representing for the entire medium. The developed model is verified by comparing with the reference solution of the fine scale model through a 3D numerical example of hydrogeology problem.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125332003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vu Thi Bach Phuong, Pham Thi Thu Hong, Quách Ngô Diễm Phương
Introduction: Our previous study showed that Urena lobata L. hairy root is a potential pharmaceutical source for type 2 diabetes treatment. In order to improve the transformation efficacy and the quality of hairy roots, this study examined the effects of several factors including age, parts of plants, infection time and culture medium in inducing hairy roots in Urena lobata L. Methods: In this study, we investigated four factors to improve the hairy root induction in Urena lobata L. These factors include: age of plant (15-day-old in vitro plants, 45-day-old in vitro plants and after two subculture generations plants), different parts of plant (roots, stems, and leaves), infection time (10, 20 and 30 minutes), and culture medium (Murashige and Skoog (MS), Gamborg B5 medium (GB5) and Woody plant medium (WPM)). All experiments were repeated three times, with uninfected leaf explants of 15-day-old in vitro as the negative control. The transformation frequency and the fresh biomass of hairy roots were recorded at four weeks after infection. Results: The results showed that the optimized procedure which used 15-day-old in vitro plants, the leafy part, the infection time of 10 minutes and culture in the WPM medium was better than the original procedure. The optimized procedure achieved a transformation frequency of 100%. In addition, the fresh biomass of hairy roots formed on an explant in the optimized procedure was 3.2 times higher than the ones induced by the original procedure. Conclusion: The results showed that the optimized procedure was more effective than the original procedure in inducing Urena lobata hairy roots.
{"title":"Improving hairy root induction of Urena lobata L. by Agrobacterium rhizogenes ATCC 15834 by some factors","authors":"Vu Thi Bach Phuong, Pham Thi Thu Hong, Quách Ngô Diễm Phương","doi":"10.32508/stdj.v21i3.430","DOIUrl":"https://doi.org/10.32508/stdj.v21i3.430","url":null,"abstract":"Introduction: Our previous study showed that Urena lobata L. hairy root is a potential pharmaceutical source for type 2 diabetes treatment. In order to improve the transformation efficacy and the quality of hairy roots, this study examined the effects of several factors including age, parts of plants, infection time and culture medium in inducing hairy roots in Urena lobata L. \u0000Methods: In this study, we investigated four factors to improve the hairy root induction in Urena lobata L. These factors include: age of plant (15-day-old in vitro plants, 45-day-old in vitro plants and after two subculture generations plants), different parts of plant (roots, stems, and leaves), infection time (10, 20 and 30 minutes), and culture medium (Murashige and Skoog (MS), Gamborg B5 medium (GB5) and Woody plant medium (WPM)). All experiments were repeated three times, with uninfected leaf explants of 15-day-old in vitro as the negative control. The transformation frequency and the fresh biomass of hairy roots were recorded at four weeks after infection. \u0000Results: The results showed that the optimized procedure which used 15-day-old in vitro plants, the leafy part, the infection time of 10 minutes and culture in the WPM medium was better than the original procedure. The optimized procedure achieved a transformation frequency of 100%. In addition, the fresh biomass of hairy roots formed on an explant in the optimized procedure was 3.2 times higher than the ones induced by the original procedure. \u0000Conclusion: The results showed that the optimized procedure was more effective than the original procedure in inducing Urena lobata hairy roots. \u0000 ","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"10 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123929275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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