Pub Date : 1900-01-01DOI: 10.32508/stdj.v26i2.4063
HaTranNguyen, C. Nguyen, T. P. Nguyen, T. T. Bui, B. Doan, T. H. Luu, C. Tran, T. Truong, Tung Viet, T. Tran, H. L. Tran, Xuan Van Mai
The linear sweep voltammetry potentiostatic approach was employed to electrochemically synthesize the conjugated copolymers P(3HT-random-HPDTP) at three distinct applied voltages (1.4, 1.435, 1.6 V). In relation to their synthesis conditions, their chemical structural, optical, and electrical properties were investigated and compared using Fourier transform infrared (FTIR) spectroscopy, UV−Vis absorption spectroscopy, and cyclic voltammetry (CV). The results indicated that choosing a suitable applied voltage in the electropolymerization process significantly improved the electro-chemical stability and lowered the HOMO level of the conjugated copolymer.
{"title":"Effect of Applied Voltage on the Electrochemical Copolymerization of Thiophene and Dithenopyrrole Derivatives","authors":"HaTranNguyen, C. Nguyen, T. P. Nguyen, T. T. Bui, B. Doan, T. H. Luu, C. Tran, T. Truong, Tung Viet, T. Tran, H. L. Tran, Xuan Van Mai","doi":"10.32508/stdj.v26i2.4063","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4063","url":null,"abstract":"The linear sweep voltammetry potentiostatic approach was employed to electrochemically synthesize the conjugated copolymers P(3HT-random-HPDTP) at three distinct applied voltages (1.4, 1.435, 1.6 V). In relation to their synthesis conditions, their chemical structural, optical, and electrical properties were investigated and compared using Fourier transform infrared (FTIR) spectroscopy, UV−Vis absorption spectroscopy, and cyclic voltammetry (CV). The results indicated that choosing a suitable applied voltage in the electropolymerization process significantly improved the electro-chemical stability and lowered the HOMO level of the conjugated copolymer.","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134215102","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4074
NguyenThiThuy, H. Trong, Duc
Introduction : In this study, we report a new design of a circular lattice photonic crystal fiber and investigate its optical properties numerically. Methods : Near-zero ultra-flattened chromatic dispersion is achieved by allowing benzene (C 6 H 6 ) to infiltrate the hollow core and induce a difference in the air hole size in the cladding. By solving Maxwell's wave equations using the full-vector finite-difference eigenmode, the electromagnetic field modes are analyzed. Results : The results show that the variation in dispersion over the broad wavelength range of 527 nm is (cid:6) 0.753 ps/nm.km. The nonlinearity coefficient is significantly improved with a value of several thousands W (cid:0) 1 .km (cid:0) 1 ; which is favorable for supercontinuum generation with low input power even though the confinement loss has not yet reached its desired value. Conclusion : Two PCFs with optimal lattice parameters and suitable characteristic quantities are selected for supercontinuum generation orientation compatible with application fields such as spectroscopy, temperature sensing, and telecommunication.
{"title":"An ultra-flattened chromatic dispersion in circular C6H6-infiltrated photonic crystal fibers","authors":"NguyenThiThuy, H. Trong, Duc","doi":"10.32508/stdj.v26i2.4074","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4074","url":null,"abstract":"Introduction : In this study, we report a new design of a circular lattice photonic crystal fiber and investigate its optical properties numerically. Methods : Near-zero ultra-flattened chromatic dispersion is achieved by allowing benzene (C 6 H 6 ) to infiltrate the hollow core and induce a difference in the air hole size in the cladding. By solving Maxwell's wave equations using the full-vector finite-difference eigenmode, the electromagnetic field modes are analyzed. Results : The results show that the variation in dispersion over the broad wavelength range of 527 nm is (cid:6) 0.753 ps/nm.km. The nonlinearity coefficient is significantly improved with a value of several thousands W (cid:0) 1 .km (cid:0) 1 ; which is favorable for supercontinuum generation with low input power even though the confinement loss has not yet reached its desired value. Conclusion : Two PCFs with optimal lattice parameters and suitable characteristic quantities are selected for supercontinuum generation orientation compatible with application fields such as spectroscopy, temperature sensing, and telecommunication.","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115798703","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4048
{"title":"Enhancement of the crystalline phase in poly(vinylidene fluoride) by using the electrospinning technique and graphene oxide composition","authors":"","doi":"10.32508/stdj.v26i2.4048","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4048","url":null,"abstract":"","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134011526","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4113
{"title":"Bacterial pathogens causing community–acquired pneumonia in hospitalized adult patients with and without chronic obstructive pulmonary disease","authors":"","doi":"10.32508/stdj.v26i2.4113","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4113","url":null,"abstract":"","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122798171","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 : 1900-01-01DOI: 10.32508/stdj.v26i1.4013
NguyenTruongLong, Huynh Anh Huy, T. Q. Tuan, L. Vo, H. Duy, N. Lâm, N. Phuong, Anh, T. Thi, Ngoc Gia, N. T. Long
Introduction: In 2D materials, the boundary of silicene formed as nanoribbons plays an essential role in synthesis and can be controlled to achieve different characteristics. Our study aims to investigate the structural preference depending on the pressure tolerance and boundary dependency. Methods: The main methodology used in our study is molecular dynamics simulation with Stillinger Weber potentials. Our simulation was carried out on 2D models of honeycomb silicene obtained through high and low pressurized cooling from the liquid state and then heat annealing for a decent time. The final configuration of silicene will be investigated in terms of structures and thermodynamic properties. Results: We found that the effect of the cooling process under high pressure formed a 4-fold ring structure, while at low pressure, 2D honeycomb networks were recovered but with different degrees of defects depending on the boundary condition. The main difference between several transitions of 2D silicene is discussed via the evolution of total energy and the change in coordination number and bond-ring distribution. Conclusions: This study provides insights into the dependency of the structure of silicene on the pressure and boundary, repre-sentedby the first-order transition at lowpressure and a congregationof disorderedlow-numbered rings into the ordered tetragonal formation at high pressure. Notably, our results have shown that silicene nanoribbon materials can be controlled by pressure to obtain unfamiliar structures such as pentagonal and tetragonal networks.
{"title":"Molecular dynamics simulation of pressure effect on silicene nanoribbons","authors":"NguyenTruongLong, Huynh Anh Huy, T. Q. Tuan, L. Vo, H. Duy, N. Lâm, N. Phuong, Anh, T. Thi, Ngoc Gia, N. T. Long","doi":"10.32508/stdj.v26i1.4013","DOIUrl":"https://doi.org/10.32508/stdj.v26i1.4013","url":null,"abstract":"Introduction: In 2D materials, the boundary of silicene formed as nanoribbons plays an essential role in synthesis and can be controlled to achieve different characteristics. Our study aims to investigate the structural preference depending on the pressure tolerance and boundary dependency. Methods: The main methodology used in our study is molecular dynamics simulation with Stillinger Weber potentials. Our simulation was carried out on 2D models of honeycomb silicene obtained through high and low pressurized cooling from the liquid state and then heat annealing for a decent time. The final configuration of silicene will be investigated in terms of structures and thermodynamic properties. Results: We found that the effect of the cooling process under high pressure formed a 4-fold ring structure, while at low pressure, 2D honeycomb networks were recovered but with different degrees of defects depending on the boundary condition. The main difference between several transitions of 2D silicene is discussed via the evolution of total energy and the change in coordination number and bond-ring distribution. Conclusions: This study provides insights into the dependency of the structure of silicene on the pressure and boundary, repre-sentedby the first-order transition at lowpressure and a congregationof disorderedlow-numbered rings into the ordered tetragonal formation at high pressure. Notably, our results have shown that silicene nanoribbon materials can be controlled by pressure to obtain unfamiliar structures such as pentagonal and tetragonal networks.","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116837047","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4107
Thu D. H. Truong, H. Tran, Hanh H. Nguyen, V. Pham
Introduction: Recently, physicists have been interested in the nonsequential double ionization (NSDI) process since it provides information about the interaction between electrons in the atomic andmolecularshellsthroughtherecollistionprocess. Technically, thedevelopmentofnear-infrared laser pulses has made them one of the most useful tools for studying the electron correlation effect in atoms and molecules. Furthermore, the parallel two-color (PTC) laser pulse is a useful instrument for controlling the process of recollision in a strong laser field. In this paper, with the aim of investigating the role of ionization mechanisms governing the NSDI of argon atoms, we use a PTC laser pulse with wavelengths of 2400 nm and 1200 nm to control the motion of two electrons. We investigate the contribution of ionization mechanisms as well as the correlation dynamics of two electrons upon the change in relative phase between the two component lasers from 0 to 2 p . Method: The two-dimensional classical ensemble model is used to simulate the NSDI process, in which the motion of two electrons is governed by Newton's law. Results: The correlated two-electron momentum distribution, recolliding time, and energy distribution after the returning electron's recolliding moment are extraordinarily sensitive to the relative phase of the two lasers. To modulate the ionization mechanisms, the relative phase between two lasers is tuned. Conclusion: The results demonstrate that parallel two-color laser pulses are an effective method of controlling the correlated electron dynamics in nonsequential double ionization.
{"title":"Controlling nonsequential double ionization mechanisms of argon atoms by parallel two-color laser pulses","authors":"Thu D. H. Truong, H. Tran, Hanh H. Nguyen, V. Pham","doi":"10.32508/stdj.v26i2.4107","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4107","url":null,"abstract":"Introduction: Recently, physicists have been interested in the nonsequential double ionization (NSDI) process since it provides information about the interaction between electrons in the atomic andmolecularshellsthroughtherecollistionprocess. Technically, thedevelopmentofnear-infrared laser pulses has made them one of the most useful tools for studying the electron correlation effect in atoms and molecules. Furthermore, the parallel two-color (PTC) laser pulse is a useful instrument for controlling the process of recollision in a strong laser field. In this paper, with the aim of investigating the role of ionization mechanisms governing the NSDI of argon atoms, we use a PTC laser pulse with wavelengths of 2400 nm and 1200 nm to control the motion of two electrons. We investigate the contribution of ionization mechanisms as well as the correlation dynamics of two electrons upon the change in relative phase between the two component lasers from 0 to 2 p . Method: The two-dimensional classical ensemble model is used to simulate the NSDI process, in which the motion of two electrons is governed by Newton's law. Results: The correlated two-electron momentum distribution, recolliding time, and energy distribution after the returning electron's recolliding moment are extraordinarily sensitive to the relative phase of the two lasers. To modulate the ionization mechanisms, the relative phase between two lasers is tuned. Conclusion: The results demonstrate that parallel two-color laser pulses are an effective method of controlling the correlated electron dynamics in nonsequential double ionization.","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123534967","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4102
{"title":"Effects of single-particle overlap function on the 16O(p,2p)15N reaction","authors":"","doi":"10.32508/stdj.v26i2.4102","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4102","url":null,"abstract":"","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124383577","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4049
Le-ThuT.Nguyen, N. Khai, H. Nguyen, Mai Ly Nguyen, Duc Anh Nguyen, H. Dang, T. Truong, Thi M Nguyen N K H, Song D A N Dang H H Truong T T L N
Introduction : The Diels-Alder reaction of maleimide and furan groups is being exploited in self-healing materials; hence, it is no wonder that with the ownership of the former, 1,1'-(methylenedi-4,1-phenylene) bismaleimide (BMI) counts as a potential candidate in this area. However, it displays certain discernible demerits arising from its inflexible structure. Furthermore, the maleimide group, in all likelihood, easily takes part in the Michael addition reaction with thiol groups under basic conditions. It is crucial that this element opens the door for this ingredient to be amended with a view to weathering its shortcomings. The goal of this research is to modify the structure of BMI to create a new oligomer with maleimides at the end of its chains. Method : The oligomer was synthesized by means of the reaction of the maleimides of BMI and the thiol groups of 2,2'-(ethylenedioxy) di-ethanethiol (dithiol) with the support of triethylamine (TEA). In addition, an investigation into the possibility of this reaction happening without the base catalyst was carried out. The application of a wide assortment of modern measurements ranging from 1 H-NMR and FT-IR to GPC provided some useful data about the molecular weight and whether the reaction occurred. Result : According to the information, the formation of the oligomer owning the maleimide and thiol terminal functions was observed with the help of TEA over the 24-hour timescale at room temperature, whereas that with a lack of this catalyst is impossible. Conclusion : The research will make a major contribution to the creation of new healable polymers reliant on the Diels-Alder mechanism in the foreseeable future.
{"title":"Synthesis of a unique oligomer by means of the thiol-maleimide reaction of extending 1,1'-(methylenedi-4,1-phenylene) bismaleimide chains for the employment of self-healing polymers","authors":"Le-ThuT.Nguyen, N. Khai, H. Nguyen, Mai Ly Nguyen, Duc Anh Nguyen, H. Dang, T. Truong, Thi M Nguyen N K H, Song D A N Dang H H Truong T T L N","doi":"10.32508/stdj.v26i2.4049","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4049","url":null,"abstract":"Introduction : The Diels-Alder reaction of maleimide and furan groups is being exploited in self-healing materials; hence, it is no wonder that with the ownership of the former, 1,1'-(methylenedi-4,1-phenylene) bismaleimide (BMI) counts as a potential candidate in this area. However, it displays certain discernible demerits arising from its inflexible structure. Furthermore, the maleimide group, in all likelihood, easily takes part in the Michael addition reaction with thiol groups under basic conditions. It is crucial that this element opens the door for this ingredient to be amended with a view to weathering its shortcomings. The goal of this research is to modify the structure of BMI to create a new oligomer with maleimides at the end of its chains. Method : The oligomer was synthesized by means of the reaction of the maleimides of BMI and the thiol groups of 2,2'-(ethylenedioxy) di-ethanethiol (dithiol) with the support of triethylamine (TEA). In addition, an investigation into the possibility of this reaction happening without the base catalyst was carried out. The application of a wide assortment of modern measurements ranging from 1 H-NMR and FT-IR to GPC provided some useful data about the molecular weight and whether the reaction occurred. Result : According to the information, the formation of the oligomer owning the maleimide and thiol terminal functions was observed with the help of TEA over the 24-hour timescale at room temperature, whereas that with a lack of this catalyst is impossible. Conclusion : The research will make a major contribution to the creation of new healable polymers reliant on the Diels-Alder mechanism in the foreseeable future.","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133706654","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 : 1900-01-01DOI: 10.32508/stdj.v26i1.4017
{"title":"Toward Deep Transfer Learning for Realistic Activity Recognition in Videos","authors":"","doi":"10.32508/stdj.v26i1.4017","DOIUrl":"https://doi.org/10.32508/stdj.v26i1.4017","url":null,"abstract":"","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121515934","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 : 1900-01-01DOI: 10.32508/stdj.v26i2.4087
Kha-Tu Huynh, Nga Tu Ly
Introduction : Major selection is always a matter of concern for students who have just graduated from high school and parents who have children to go to universities. Currently, there are many students who selected the wrong major, leading to unexpected learning results and wasting time and money. In fact, many students do not know which majors they are suitable for. The paper proposes a model of decision-making support in choosing majors for students immediately after graduating from high school using deep learning. Methods : The model applied the XGBoost al-gorithm to build a decision tree for classification, mining educational data from which the student's ability and learning propensity are predicted and the appropriate majors are suggested. Results : The data used for the system are collected from 1709 students' results at the high school, the survey results on personal interests and personality, the teacher's comments and the results on major selection after graduation. From these data, the authors have built a model to advise students choosing the right major to continue their higher education. Conclusion : The model is evaluated and verified through actual experiments with a high accuracy of 86% and proves the contribution of deep learning models to education.
{"title":"A deep learning model of major consulting support","authors":"Kha-Tu Huynh, Nga Tu Ly","doi":"10.32508/stdj.v26i2.4087","DOIUrl":"https://doi.org/10.32508/stdj.v26i2.4087","url":null,"abstract":"Introduction : Major selection is always a matter of concern for students who have just graduated from high school and parents who have children to go to universities. Currently, there are many students who selected the wrong major, leading to unexpected learning results and wasting time and money. In fact, many students do not know which majors they are suitable for. The paper proposes a model of decision-making support in choosing majors for students immediately after graduating from high school using deep learning. Methods : The model applied the XGBoost al-gorithm to build a decision tree for classification, mining educational data from which the student's ability and learning propensity are predicted and the appropriate majors are suggested. Results : The data used for the system are collected from 1709 students' results at the high school, the survey results on personal interests and personality, the teacher's comments and the results on major selection after graduation. From these data, the authors have built a model to advise students choosing the right major to continue their higher education. Conclusion : The model is evaluated and verified through actual experiments with a high accuracy of 86% and proves the contribution of deep learning models to education.","PeriodicalId":160917,"journal":{"name":"Science & Technology Development Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128861913","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：