JST: Engineering and Technology for Sustainable Development最新文献_第8页

Effects of Fe Dopant on Structural, Optical and Electrical Properties of NiTiO3 Materials 铁掺杂对NiTiO3材料结构、光学和电学性能的影响

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-07-15 DOI: 10.51316/jst.159.etsd.2022.32.3.7

T. Ngoc, L. Bac

{"title":"Effects of Fe Dopant on Structural, Optical and Electrical Properties of NiTiO3 Materials","authors":"T. Ngoc, L. Bac","doi":"10.51316/jst.159.etsd.2022.32.3.7","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.7","url":null,"abstract":"In this study, the effects of Fe dopant on the structural, optical, and electrical properties of NiTiO3 materials prepared by sol-gel method were investigated. The prepared powders were investigated through X-ray diffraction, Raman scattering, scanning electron microscope, UV-visible absorption, vibrating sample magnetometer, electrical measurement to explore the structural, ferromagnetic, and electrical properties. The single-phase Ni1-xFexTiO3 (x = 0, 0.05 and 0.10) materials were obtained. Doping of Fe into NiTiO3 lead to the decreasing of lattice parameter and increased the particle size compared to the undoped sample. Ferroelectric and ferromagnetic properties of all Fe-doped NiTiO3 ceramics have been investigated at room temperature. The ferromagnetic hysteresis loop of the Fe-doped NiTiO3 sample at room temperature is due to the formation of oxygen vacancies and their associated exchange interaction. Ferroelectric properties of Fe doped samples were decreased with the increase of Fe concentration. This can be due to the Fe dopant into NiTiO3 material. The Fe dopant caused to increase the conductivity of NiTiO3 sample which resulted in a decrease in ferroelectric parameters.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74768632","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}

引用次数: 0

Quantitative Fragrance Durability Evaluation Depending on Keeping Condition of Knitted Fabric Treated by Microcapsules Containing Star Anise Essential Oil 八角茴香精油微胶囊处理针织物保鲜条件下的香味持久性定量评价

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-07-15 DOI: 10.51316/jst.159.etsd.2022.32.3.4

Chu Diệu Hương, Nguyen Thi Tuyet Trinh

{"title":"Quantitative Fragrance Durability Evaluation Depending on Keeping Condition of Knitted Fabric Treated by Microcapsules Containing Star Anise Essential Oil","authors":"Chu Diệu Hương, Nguyen Thi Tuyet Trinh","doi":"10.51316/jst.159.etsd.2022.32.3.4","DOIUrl":"https://doi.org/10.51316/jst.159.etsd.2022.32.3.4","url":null,"abstract":"Fabric treated by fragrance was one of textile applications. The evaluation of fragrance durability of fabric treated by the fragrance was always the subject of many researches, though quantitatively determining fragrance intensity was difficult and there will not always be agreement on odor characteristics by different testers. In this paper, we built a simple and quantitative method to evaluate the fragrance intensity, which could be considered as the remained oil quantity on fabric treated by microcapsule loaded with star anise essential oil. The evaluation was based on the combination of the expert method and diluted solution method. This method was used to evaluate the influence of the knitted fabric’s keeping conditions on fragrance duration of the fabric. Two groups of single jersey fabric have been prepared: one was knitted from the Ne 40/1 Chief Value Cotton (CVC) yarn (60% cotton and 40% polyester). The second group was also single jersey fabric knitted from the Ne 46/1 100% cotton. The knitted fabrics were treated with microcapsules containing star anise essential oil and then have been kept in ambient conditions (temperature was about 25 oC ±2, relative humidity was 75% ±2) and in the cold dried condition (temperature was about 2 oC, relative humidity was 20%). The results showed that the developing method in the research can be used to effectively quantitatively evaluate the fragrance intensity of fabric treated by fragrance. The fabrics treated by microcapsules containing star anise oil essential remained their fragrance longer than 7 days in the cool dried condition while which ones in the ambient condition finished their fragrance after 5 days.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73148524","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}

引用次数: 0

A Study on the Effect of Squish Area on Engine Performance of Single Cylinder Natural Gas Converted Engine 压扁面积对单缸天然气改造发动机性能影响的研究

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.5

Van Tien Nguyen, Tran Dang Quoc

引用次数: 0

Removal of Proteins and Its Effect on Molecular Structure and Properties of Natural Rubber 蛋白质的去除及其对天然橡胶分子结构和性能的影响

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.2

N. T. Thuong, P. T. Nghia, S. Kawahara

{"title":"Removal of Proteins and Its Effect on Molecular Structure and Properties of Natural Rubber","authors":"N. T. Thuong, P. T. Nghia, S. Kawahara","doi":"10.51316/jst.157.etsd.2022.32.2.2","DOIUrl":"https://doi.org/10.51316/jst.157.etsd.2022.32.2.2","url":null,"abstract":"Removal of protein from natural rubber was carried out via deproteinization of natural rubber in the latex stage. Then, its effect on the molecular structure and properties of natural rubber was investigated. Urea, SDS, and acetone were used as denaturing agent, a surfactant, and a polar solvent in the deproteinization, respectively. Various deproteinized natural rubbers were obtained after one, two, and three times of centrifugation with and without acetone, namely DPNR1, DPNR2, DPNR3, DPNR1-A, DPNR2-A, and DPNR3-A. It was found that the total protein content significantly decreased as increasing the number of centrifugations; however, the total fatty acid contents showed a slight decrease. Structural characteristics analyzed by nuclear magnetic resonance spectroscopy indicated no changes in the chemical structure of natural rubber after deproteinization. However, the removal of proteins significantly enhanced the resolution of the NMR signals. Gel content and tensile properties of natural rubber showed a decrease in the removal of proteins, which was associated with the decrease in the number of the inherent branching points formed in natural rubber.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84333414","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}

引用次数: 1

Control of Semi-Active Suspension System Using Kalman Observer 基于卡尔曼观测器的半主动悬架控制

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.9

N. Kien, D. H. Phuc, Lai Nang Vu, Vu Hai Thuong

{"title":"Control of Semi-Active Suspension System Using Kalman Observer","authors":"N. Kien, D. H. Phuc, Lai Nang Vu, Vu Hai Thuong","doi":"10.51316/jst.157.etsd.2022.32.2.9","DOIUrl":"https://doi.org/10.51316/jst.157.etsd.2022.32.2.9","url":null,"abstract":"Optimal control methods are increasingly used in automatic control systems, especially in automotive suspension system. However, the optimal control algorithm only achieves the highest efficiency in suspension control system when the required number of sensors is sufficient, corresponding to the number of states in the system. The arrangement of sufficient number of sensors depends on the capacity, economic conditions and responsiveness of the sensor. The Kalman observer is designed to reliably estimate the required parameters in the control where the number of sensors is limited. The article focuses on analyzing the theory of building a quarter-car model, developing and determining the optimal control matrix, the Kalman observer design method. The findings of the article reveal the effectiveness of automotive body vibration suppression and the required force for control corresponding to LQG control and LQR control, under the influence of square pulse road surface, when using two similar sensors are installed on the sprung and unsprung, thereby providing a choice of sensor type and the location on the semi-active ¼ suspension.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82729880","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}

引用次数: 0

Simplified Trajectory-Tracking Method for an Under-Actuated USV 欠驱动无人潜航器的简化轨迹跟踪方法

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.8

Xuan-Dung Nguyen, Trung-Kien Vo, M. Ha

引用次数: 0

Appraisal Burning Characteristic and Analysis Effect of Cavity in Scramjet Combustion Chamber 超燃冲压发动机燃烧室空腔燃烧特性评价及影响分析

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.4

LE Van-Minh, C. Dinh, Q. Pham, TA Duc-Huy, V. Quang-sang, H. Luu, The-Mich Nguyen, A. Nguyen

{"title":"Appraisal Burning Characteristic and Analysis Effect of Cavity in Scramjet Combustion Chamber","authors":"LE Van-Minh, C. Dinh, Q. Pham, TA Duc-Huy, V. Quang-sang, H. Luu, The-Mich Nguyen, A. Nguyen","doi":"10.51316/jst.157.etsd.2022.32.2.4","DOIUrl":"https://doi.org/10.51316/jst.157.etsd.2022.32.2.4","url":null,"abstract":"The combustion chamber clearly plays an critical role in generating thrust force so the aircraft can move forward. A scramjet (supersonic combustion ramjet) is a variant of a ramjet airbreathing jet engine in which combustion takes place in supersonic airflow. Researchers are constantly working to improve the efficiency of ultrasonic combustion furnaces by various methods such as: optimize fuel injectors, optimize combustion chamber geometry design, create hole cavity. In this research, the characteristic of supersonic airflow were investigated, and a comparison between the standard chamber and advanced chamber was made to determine the effects of a circular hole (cavity) on pressure and velocity of the fuel mixture through the scramjet. Two dimensional Reynolds-Averaged Navier-Stokes governing(RANS) equations with k− turbulence model and finite rate/eddy dissipation chemistry model have been considered for modelling chemical reacting flows. From the comparison of numerical results, it is found that the development of recirculation regions and additional shock waves from the edge of cavity flame holder is increased and achieved stabilized combustion. From this research analysis, the performance of the scramjet engine with cavity is significantly improved as compared to the design without cavity","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89061761","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}

引用次数: 0

"Structural Elucidation of Some Phenolic Compounds from the Leaves of Kadsura Coccinea in Vietnam" 越南山茱萸叶中酚类化合物的结构分析

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.1

L. Thuy, T. Huong, Le Huyen Tram, N. Dang

引用次数: 0

Synthesis of Fatty Acid Amide from Waste Cooking Oil as an Additive for Asphalt Binder 废食用油合成脂肪酸酰胺作为沥青粘结剂的研究

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.3

N. A. Vũ, N. H. Long, N. T. Thuong

引用次数: 0

Electroosmosis of the Second Kind on Flat Charged Surfaces - a Direct Numerical Simulation Study 平面带电表面的第二类电渗透——直接数值模拟研究

JST: Engineering and Technology for Sustainable Development Pub Date : 2022-04-15 DOI: 10.51316/jst.157.etsd.2022.32.2.6

V. Dang, Thu Ha Pham Thi, V. Pham

{"title":"Electroosmosis of the Second Kind on Flat Charged Surfaces - a Direct Numerical Simulation Study","authors":"V. Dang, Thu Ha Pham Thi, V. Pham","doi":"10.51316/jst.157.etsd.2022.32.2.6","DOIUrl":"https://doi.org/10.51316/jst.157.etsd.2022.32.2.6","url":null,"abstract":"While the electroosmosis of the first kind (equilibrium) is accepted widely, the electroosmosis of the second kind (nonequilibrium) is still controversial. In this work, the theory of electroosmosis slip, of either the first kind or of the second kind at electrolyte membrane system is revisited via our direct numerical simulation. The obtained results show that above a certain voltage threshold, the basic conduction state becomes electroconvectively unstable. This instability provides a mechanism for explaining the over-limiting conductance in concentration polarization at a permselective membrane. The most important work in our study is to examine the famous electroosmosis of the second kind formula suggested by Rubinstein and Zaltzman in 1999. Although their formula has been presented for a long time, there has been no work to validate its accuracy experimentally or numerically due to the difficulty in pinpointing exactly the extended space charge layer in their formula. By using direct numerical simulation, we could solve this problem and inspect the application range of their formula. This also helps to strongly confirm the relationship between the electroosmosis of the second kind and the instability in concentration polarization at electrodialysis membranes.","PeriodicalId":17641,"journal":{"name":"JST: Engineering and Technology for Sustainable Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75969930","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}

引用次数: 0