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Tin electronucleation and growth from Sn(II) in nonaqueous solutions based on ethylene glycol: Electrochemical behavior and temperature effect

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Transactions of Nonferrous Metals Society of China 2023年

作者： Kiem Do Van Nguyen Van Hieu tu le manh Phenikaa Research and Technology Institute (PRATI)， A&A Green Phoenix Group Faculty of Electrical and Electronic Engineering， Phenikaa University Faculty of Materials Science and Engineering， Phenikaa Institute for Advanced Study (PIAS)， Phenikaa University

Thermodynamic and kinetic aspects of tin electronucleation and growth processes onto a glassy carbon electrode from SnCl2·2H2O dissolved in ethylene glycol solutions were studied. Typical reduction and oxidation peaks observed in voltammograms have demonstrated the capability of ethylene glycol solutions to electrodeposit Sn. The temperature-dependence of diffusion coefficient values derived from potentiodynamic and potentiostatic studies helped to determine and validate estimations of the activation energy for Sn(II) bulk diffusion. Chronoamperometric results have identified that， the suitable model to describe the early stage of Sn electrodeposition could be composed of Sn three-dimensional nucleation and diffusion-controlled growth and water reduction contributions， which was duly validated by theoretical and experimental approaches. From the model， typical kinetic parameters such as nucleation frequency， A， number density of tin nuclei， N0， and D， were determined. The presence of tin nuclei with excellent quality and their structure were verified using SEM， EDX， and XRD techniques.

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Object Detection in Remote Sensing Images Using Picture Fuzzy Clustering and MapReduce

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Computer Systems Science & Engineering 2022年第12期43卷 1241-1253页

作者： Tran manh tuan Tran Thi Ngan Nguyen tu Trung Faculty of Computer Science and Engineering Thuyloi University175 Tay SonDong DaHanoi010000Vietnam

In image processing, one of the most important steps is image segmentation. The objects in remote sensing images often have to be detected in order toperform next steps in image processing. Remote sensing images usually havelarge size and various spatial resolutions. Thus, detecting objects in remote sensing images is very complicated. In this paper, we develop a model to detectobjects in remote sensing images based on the combination of picture fuzzy clustering and MapReduce method (denoted as MPFC). Firstly, picture fuzzy clustering is applied to segment the input images. Then, MapReduce is used to reducethe runtime with the guarantee of quality. To convert data for MapReduce processing, two new procedures are introduced, including Map_PFC and Reduce_*** formal representation and details of two these procedures are presented in thispaper. The experiments on satellite image and remote sensing image datasets aregiven to evaluate proposed model. Validity indices and time consuming are usedto compare proposed model to picture fuzzy clustering model. The values ofvalidity indices show that picture fuzzy clustering integrated to MapReduce getsbetter quality of segmentation than using picture fuzzy clustering only. Moreover,on two selected image datasets, the run time of MPFC model is much less thanthat of picture fuzzy clustering.

关键词： Remote sensing images picture fuzzy clustering image segmentation object detection MapReduce

Combining Entropy Optimization and Sobel Operator for Medical Image Fusion

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Computer Systems Science & Engineering 2023年第1期44卷 535-544页

作者： Nguyen tu Trung Tran Thi Ngan Tran manh tuan To Huu Nguyen Faculty of Computer Science and Engineering Thuyloi University175 Tay SonDong DaHanoi010000Vietnam University of Information and Communication Technology Thai Nguyen UniversityThai Nguyen240000Vietnam

Fusing medical images is a topic of interest in processing medical *** is achieved to through fusing information from multimodality images for the purpose of increasing the clinical diagnosis *** fusion aims to improve the image quality and preserve the specific *** methods of medical image fusion generally use knowledge in many differentfields such as clinical medicine,computer vision,digital imaging,machine learning,pattern recognition to fuse different medical *** are two main approaches in fusing image,including spatial domain approach and transform domain *** paper proposes a new algorithm to fusion multimodal *** algorithm is based on Entropy optimization and the Sobel *** transform is used to split the input images into components over the low and high frequency ***,two fusion rules are used for obtaining the fusing *** rule,based on the Sobel operator,is used for high frequency *** second rule,based on Entropy optimization by using Particle Swarm Optimization(PSO)algorithm,is used for low frequency *** algorithm is implemented on the images related to central nervous system *** experimental results of the paper show that the proposed algorithm is better than some recent methods in term of brightness level,the contrast,the entropy,the gradient and visual informationfidelity for fusion(VIFF),Feature Mutual Information(FMI)indices.

关键词： Medical image fusion wavelet entropy optimization PSO Sobel operator

Effect of heating time on structural,morphology,optical,and photocatalytic properties of g-C3N4 nanosheets

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Chinese Physics B 2020年第5期29卷 504-508页

作者： Nguyen manh Hung le Thi Mai Oanh Lam Thi Hang Pham Do Chung Pham Thi Duyen Dao Viet Thang Nguyen Van Minh Center for Nano Science and Technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi100000Vietnam Department of Physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41A Phu Dien RoadNorth Tu LiemHanoi100000Vietnam Hanoi University of Mining and Geology Duc Thang wardNorth Tu Liem DistrictHanoi100000Vietnam Military science Academy 322 Le Trong Tan streetDinh CongHoang MaiHanoi100000Vietnam

Effect of heating time on the structural,morphology,optical,and photocatalytic properties of graphitic carbon nitride(g-C3N4)nanosheets prepared at 550℃in Ar atmosphere is *** investigations are carried out by using x-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),UV-vis absorption,and photoluminescence(PL).At a heating temperature of 550℃,g-C3N4 nanocrystals are formed after 0.5 h and become more orderly as the heating time *** surface area of the g-C3N4 nanosheets significantly increases as the preparation time *** g-C3N4 prepared in 2.5 h shows the highest photocatalytic performance,decomposing completely 10 ppm RhB solution under xenon lamp irradiation for 2.0 h.

关键词： nanosheets photocatalytic heating time Ar atmosphere

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Fusing Satellite Images Using ABC Optimizing Algorithm

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Computer Systems Science & Engineering 2023年第9期46卷 3901-3909页

作者： Nguyen Hai Minh Nguyen tu Trung Tran Thi Ngan Tran manh tuan University of Information and Communication Technology Thai Nguyen UniversityThai Nguyen240000Vietnam Faculty of Computer Science and Engineering Thuyloi University175 Tay SonDong DaHanoi010000Vietnam

Fusing satellite(remote sensing)images is an interesting topic in processing satellite *** result image is achieved through fusing information from spectral and panchromatic images for *** this paper,a new algorithm based on based the Artificial bee colony(ABC)algorithm with peak signalto-noise ratio(PSNR)index optimization is proposed to fusing remote sensing images in this ***,Wavelet transform is used to split the input images into components over the high and low frequency ***,two fusing rules are used for obtaining the fused *** first rule is“the high frequency components are fused by using the average values”.The second rule is“the low frequency components are fused by using the combining rule with parameter”.The parameter for fusing the low frequency components is defined by using ABC algorithm,an algorithm based on PSNR index *** experimental results on different input images show that the proposed algorithm is better than some recent methods.

关键词： Remote sensing image satellite images image fusion wavelet PSNR optimization ABC

越南Grand World Phu Quoc游客中心

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现代装饰 2022年第5期 102-107页

作者： Vo Trong Nghia Nguyen Tat Dat Nguyen Van An tu Minh Dong Bui Quang Huy manh Trong Danh Thai Khac Phuc Hiroyuki Oki(摄影) 范嘉苑(v) 不详

本案是Grand World Phu Quoc度假区的游客中心,也是Phu Quoc United Center休闲娱乐群的核心,隶属于越南珍珠酒店集团Vinpearl旗下项目。业主希望建筑团队打造一个能体现越南文化的竹结构建筑,它不仅能成为整个区域的标志,同时还能吸引... 详细信息

本案是Grand World Phu Quoc度假区的游客中心,也是Phu Quoc United Center休闲娱乐群的核心,隶属于越南珍珠酒店集团Vinpearl旗下项目。业主希望建筑团队打造一个能体现越南文化的竹结构建筑,它不仅能成为整个区域的标志,同时还能吸引游客们来到Grand World Phu Quoc度假区。该项目规模恢弘,占地面积为1460平方米。建筑团队以竹结构为基础,并将莲花和铜鼓这两个越南传统符号雕刻进密集而层叠的竹网之中,以展现越南的传统文化。

关键词：占地面积酒店集团越南文化 Grand 度假区竹结构 World 游客

Molybdate Doped Polypyrrole： Preparation, Properties and Application

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材料科学与工程（中英文A版） 2013年第5期3卷 321-328页

作者： Ha manh Hung le Minh Duc Tran Vinh Dieu Vu Quoc Trung Faculty of Chemistry Hanoi National University of Education Cau Giay District Hanoi Vietnam Faculty of General Education Hanoi University of Mining and Geology Dong Ngac Tu Liem Hanoi Vietnam Faculty of Chemical Engineering Danang University oJ l"echnology Lien Chieu District Danang Vietnam Centre of Polymer Research Hanoi University of Science and Technology Hai Ba Trung District Hanoi Vietnam

Molybdate doped-polypyrrole (PPy) was electropolymerised on the mild steel surface. The morphology of polymer film was studied with scanning electron microscopy (SEM). The chemical structure of polymer was characterized with Raman spectroscopy. The presence of molybdate doped inside polypyrrole was identified by EDX spectra. The thermal analysis (TGA) showed that polypyrrole was stable up to 500 °C. The corrosion protection of the polymer film was investigated by electrochemical methods showing that the polymer film acted as a barrier layer and molybdate as an inhibitor for corrosion protection of metal. Molybdate dopant was the key component of "self-healling" polypyrrole film.

关键词：掺杂聚吡咯钼酸盐扫描电子显微镜防腐蚀保护制备应用性能聚合物膜

Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests

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Journal of Forestry Research 2020年第5期31卷 1713-1722页

作者： Tran Van Do Mamoru Yamamoto Osamu Kozan Vo Dai Hai Phung Dinh Trung Nguyen Toan Thang Lai Thanh Hai Vu Thanh Nam Trieu Thai Hung Hoang Van Thang Tran Duc manh Cao Chi Khiem Vu Tien Lam Nguyen Quang Hung Tran Hoang Quy Pham Quang tuyen Trinh Ngoc Bon Nguyen Thi Thu Phuong Ninh Viet Khuong Nguyen Van tuan Dang Thi Hai Ha Tran Hai Long Dang Van Thuyet Dang Thinh Trieu Nguyen Van Thinh Tran Anh Hai Duong Quang Trung Nguyen Van Bich Dinh Hai Dang Pham Tien Dung Nguyen Huy Hoang le Thi Hanh Phan Minh Quang Nguyen Thi Thuy Huong Hoang Thanh Son Nguyen Thanh Son Nguyen Thi Van Anh Nguyen Thi Hoai Anh Pham Dinh Sam Hoang Thi Nhung Hoang Van Thanh Nguyen Huu Thinh Tran Hong Van Ho Trung Luong Bui Kieu Hung Research Institute for Sustainable Humanosphere Kyoto UniversityUjiKyotoJapan Silviculture Research Institute Vietnamese Academy of Forest SciencesNorth Tu LiemHanoiVietnam Center for Southeast Asian Studies Kyoto UniversityKyotoJapan Vietnamese Academy of Forest Sciences North Tu LiemHanoiVietnam Vietnam Administration of Forestry No.2 Ngoc HaBa DinhHanoiVietnam

Biotic and abiotic factors control aboveground biomass(AGB)and the structure of forest *** study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam.A data set of 1731-ha plots from 52 locations in undisturbed old-growth forests was *** results indicate that basal area and AGB are closely correlated with annual precipitation,but not with annual temperature,evaporation or hours of *** area and AGB are positively correlated with trees>30 cm *** areas surveyed(52.6%)in these old-growth forests had AGB of 100–200 Mg ha^-1;5.2%had AGB of 400–500 Mg ha^-1,and 0.6%had AGB of>800 Mg ha^-*** percent of the areas surveyed had stand densities of 300–600 ***^-1,and 64%had basal areas of 20–40 m^2 ha^-*** is an important factor influencing the AGB of old-growth,evergreen broadleaved forests in *** causing the loss of large-diameter trees(e.g.,>100 cm DBH)affects AGB but may not seriously affect stand density.

关键词： Aboveground biomass Carbon storage Climatic variables Ecoregion Edaphic variables Oldgrowth forest

维普期刊数据库