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Optical Trap 2D Array by Acoustic Modulation

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Journal of Physical Science and Application 2014年第7期4卷 420-425页

作者： Van Thinh nguyen Quang Quy Ho Physics Faculty Bac Lieu University Bac Lieu Vietnam Institute of Applied Physics NEWTECHPRO VAST 8 Hoang Quoc Viet Hanoi Vietnam

In this artilce a new optical trap 2D array by the acoustic modulation is proposed. Based on the ＂called＂ acoustic-elasticity of the fluid embedding trapped microparticle, the expression describing the refractive index induced by cross-interference of two perpendicular ultrasonic waves is approximately derived. By simulation, the 2D array of the Graded-refractive index lenses appeared in the fluid layer with certain strain-acoustic constant and thickness. The trapping capability of the plane-wave laser beam propagating through those lenses is shown out, and the appearance of the optical trap 2D array has been affirmed.

关键词： Optical trap array acoustic modulation microlens.

Change Detection of Land Use and Riverbank in Mekong Delta, vietnam Using Time Series Remotely Sensed Data

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Journal of Resources and Ecology 2011年第4期2卷 370-374页

作者：阮林道范巴赫闵阮青潘麦黎蓬晃披越南胡志明市资源地理研究所GIS与遥感研究中心

By taking the advantages of remote sensing technology, changes of land cover in Ca Mau Peninsular （the Southern part of the Mekong delta） and erosion of riverbank of the Mekong River have been defined. Change detection using time-series optical and radar satellite images （Landsat, SPOT and Radarsat） is the main approach in this study. Typical land cover in Ca Mau Peninsular is mangrove; its changes are observable by analysing imageries from 1973 to 2008. The results showed that more than half of the mangrove area was converted into shrimp farms. This made forest cover severely declined. Riverbank of the Mekong River also was detected to be eroded and accreted in a complicated form. Locations along the left and right banks of Tien and Hau river are defined as hot spots that are seriously suffered erosions. Topographic maps in 1966-1968 were taken into account as base line data, which was analyzed along with satellite images from 1989 to 2009. In addition, the Digital Shoreline Analysis System （DSAS） package was taken to analyze trend of changes in terms of changing prediction.

关键词： remote sensing change detection land use riverbank erosion

Simulation Nutrient Load under Climate Change Condition and Deforestation Scenarios in Phu luong Watershed, viet Nam

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Journal of Environmental Science and Engineering(B) 2012年第2期1卷 199-207页

作者： Dinh Binh Phan Thanh Hai nguyen Faculty of Resources and Environmental Science Thai Nguyen University of Agriculture and Forestry Thai Nguyen City 280 Vietnam

The purpose of this paper is to apply ＂Soil and Water Assessment Tool （SWAT）＂ model to simulate the impacts of climate change and deforestation on nutrient （nitrogen and phosphorus） yield from Phu luong watershed in Northern viet Nam. Among the three climate change scenarios B1, B2 and A2, which represented low, medium, and high levels of greenhouse gas emission respectively, were set up for viet Nam. The B2 scenario was selected for this study. Two land use scenarios （SI-2030 and S2-2050 which converted 4.43%. and 13.40% forest-mixed land into agricultural land, respectively） were formulated by combination with climatic change in SWAT simulation. In B2 climate change scenario, mean temperature increases 0.7 ℃ （2030） and 1.3 ℃（2050）; annual rainfall increases 2.1% （2030） and 3.80% （2050） with respect to baseline scenario. The results showed that monthly Nash-Sutcliffe coefficient of Efficiency （NSE） ranged from 0.81 to 0.96 and percent bias （PB1AS） ranged from -7.88 to 9.38. Additionally, SWAT simulation results also showed that climate change and deforestation caused significant percentage of changes in total N and P loads within Phu luong watershed.

关键词： SWAT climate change deforestation nutrient yield.

SOME PRELIMINARY RESULTS FROM STUDY OF CRUSTAL DEFORMATION IN vietNAM

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大地测量与地球动力学 2003年第B12期23卷 114-118页

作者： Cao Dinh Trieu Le Van Dung nguyen Huu Tuyen Pham Nam Hung Institute of Geophysics Institute of GeophysicsInstitute of GeophysicsInstitute of Geophysics 18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi

In this work, the authors present some results of strain monitoring within the territory of vietnam from 1984 to 2001. Data analysis shows that (1) the Phu Lien area is tectonically stable with low strain rate, 1×10\+\{-6\} /a; (2) the Hoa Binh area has indication of tectonic instability with relatively high strain rate of the earth crust: absolute value of the strain reaching 100×10\+\{-6\}, usual average strain amplitude of 60×10\+\{-6\}, whereas the monthly average strain intensity varies in a range from 30×10\+\{-6\} to 50×10\+\{-6\}; (3) there are clear indications of the strain state of the earth crust before occurrence of earthquakes of medium or higher magnitude. This is a very important indication in the research and short term prediction of earthquakes, especially for the areas with low seismic stability like the NW of vietnam.

关键词：越南表层变形应变测量系统操作原则应变数据因变与地震相对关系地震活动特性

合柱秋海棠——越南北部喀斯特地区秋海棠科盾叶一新种

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植物研究 2022年第4期42卷 521-527页

作者：陈文红李景秀 nguyen Quang-Hieu nguyen Sinh-Khang PHAM Van-The 范长丽向建英税玉民中国科学院东亚植物多样性与生物地理学重点实验室中国科学院昆明植物研究所中国昆明650201 昆明植物园中国科学院昆明植物研究所中国昆明650201 植物保育中心越南科学技术联盟越南河内生态与生物资源研究所越南科学技术部越南河内环境管理研究室高级科技研究所孙德盛大学越南胡志明市技术系孙德盛大学技术系越南胡志明市云南生物多样性研究院西南林业大学中国昆明650224 云南省喀斯特地区生物多样性保护研究会中国昆明650201 滇东南热带山地生态系统定位研究站中国屏边661200

描述了采自越南北部喀斯特地区秋海棠科(Begoniaceae)盾叶一新种,即合柱秋海棠(Begonia holostyla)。该新种在盾形叶和具黑色斑点的果实特征上相似于肿柄秋海棠(***),但是在合生到一半的花柱和新月形的柱头方面则不同,后者花柱基部合生... 详细信息

描述了采自越南北部喀斯特地区秋海棠科(Begoniaceae)盾叶一新种,即合柱秋海棠(Begonia holostyla)。该新种在盾形叶和具黑色斑点的果实特征上相似于肿柄秋海棠(***),但是在合生到一半的花柱和新月形的柱头方面则不同,后者花柱基部合生,柱头2次分裂成1个螺旋状的带。此外,讨论了与近缘种肿柄秋海棠的形态差异和地理联系。

关键词：侧膜组合生花柱喀斯特地区盾叶越南

High-performance carbon fiber/gold/copper composite wires for lightweight electrical cables

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Journal of Materials Science & Technology 2020年第7期42卷 46-53页

作者： Thang Q.Tran Jeremy Kong Yoong Lee Amutha Chinnappan nguyen Huu Loc Long T.Tran Dongxiao Ji W.A.D.M.Jayathilaka Vishnu Vijay Kumar Seeram Ramakrishna Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1EA-07-05Singapore 117575Singapore Faculty of Mechanical Engineering Ho Chi Minh City University of TechnologyVNUHCM268 Ly Thuong KietDistrict 10Ho Chi Minh City 740400Viet Nam

In this study,we synthesized high-performance Carbon Fiber/Gold/Copper(CF/Au/Cu)composite wires by using a 2-step deposition method via sputtering and *** Au was sputtered on PANbased CFs as a pre-treatment,the wettability and surface reactivity of the CFs were improved,resulting in a homogeneous deposition of Cu on their *** different Cu electrodeposition time,the resulting CF/Au/Cu composite wires could possess a high strength of up to 3.27 GPa(~10 times stronger than copper wires)while their electrical conductivity could be as high as 4.4×10^5 S/cm(~75%of that for copper).More importantly,since the composite wires were lightweight(up to 70%lower than Cu mass density),they are a promising candidate to substitute conventional heavy metal wires in the future electrical applications.

关键词： Carbon fiber Copper composite wires Strength Electrical properties

Surface defect engineering of metal oxides photocatalyst for energy application and water treatment

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Journal of Materiomics 2021年第2期7卷 388-418页

作者： Pankaj Raizada Vatika Soni Abhinandan Kumar Pardeep Singh Aftab Aslam Parwaz Khan Abdullah M.Asiri Vijay Kumar Thakur Van-Huy nguyen Advance School of Chemical Sciences Shoolini UniversitySolanHP173229India Center of Excellence for Advanced Materials Research King Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Biorefining and Advanced Materials Research Centre Scotland Rural College(SRUC)EdinburghUnited Kingdom Institute of Research and Development Duy Tan UniversityDa Nang550000Viet Nam

Despite metal oxides offer excellent characteristics in the field of photocatalysis,they often suffer from charge carrier recombination as well as limited visible response,which indeed reduce the charge kinetics process and ultimately reduce the photocatalytic *** engineering is a sophisticated technique to manufacture defects and alter the geometric structure and chemical environment of the *** present study provides an all-inclusive outline of recent developments on the classification of metal oxide defects based on the dimensions of a host crystal ***,surface modification of metal oxides through 0D(point),1D(line),2D(planar),and 3D(volume)defects with their subsequent mechanism and impact on photocatalytic performance are *** wisely amending the morphology(cores along with the shells)and electronic structure of metal oxide photocatalysts(TiO_(2),ZnO,Bi_(2)O_(3),Fe_(2)O_(4) etc.)through different attuned and veritable approaches,their photocatalytic activity can be substantially *** studies on defect engineering not only expose the altered physicochemical features but also modulate the electron-hole pair dynamics,stability,and active radical production for various photoredox *** atomic,as well as electronic configuration,facilitated a photocatalyst material to have different optical features,adsorption properties along with improved carrier transfer as well as isolation ***,the systematic exploration of photocatalytic rudiments of defect rich metal oxide for various applications such as H_(2) evolution,CO_(2) reduction,pollutant degradation,and bacterial disinfection could bring significant research advancement in this field.

关键词： Defect engineering Nanostructured metal oxides Photocatalysis Surface reactions Point defects Dislocations Boundaries Voids

Positron-emission tomography/computed tomography imaging in head and neck oncology:An update

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World Journal of Otorhinolaryngology 2016年第2期6卷 23-32页

作者： viet D nguyen Bundhit Tantiwongkosi Wyatt J Weinheimer Frank R Miller Department of Radiology University of TexasHealth Science Center at San Antonio Division of Neuroradiology Department of Radiology and Otolaryngology Head Neck SurgeryUniversity of Texas Health Science Center at San Antonio Department of Otolaryn-gology Head Neck Surgery University of Texas Health Science Center at San Antonio

Cancers of the head and neck account for more than half a million cases worldwide annually, with a significant majority diagnosed as squamous cell carcinoma(HNSCC). Imaging studies such as contrast-enhanced computed tomography(CT), magnetic resonance imaging(MRI) and ^(18)F-2-fluoro-2-deoxy-D-glucose positron-emission tomography/computed tomography(^(18)F-FDG PET/CT) are widely used to determine the presence and extent of tumors and metastatic disease, both before and after treatment. Advances in PET/CT imaging have allowed it to emerge as a superior imaging modality compared to both CT and MRI, especially in detection of carcinoma of unknown primary, cervical lymph node metastasis, distant metastasis, residual/recurrent cancer and second primary tumors, often leading to alteration in management. PET/CT biomarker may further provide an overall assessment of tumor aggressiveness with prognostic implications. As new developments emerged leading to better understanding and use of PET/CT in head and neck oncology, the aim of this article is to review the roles of PET/CT in both pre- and post-treatment management of HNSCC and PET-derived parameters as prognostic indicators.

关键词： Positron emission tomography Staging Diagnosis Computed tomography Head and neck cancer Management of squamous cell carcinoma Carcinoma of unknown primary Second primary malignancy Surveillance Recurrence Prognosis

Short mucin 6 alleles are associated with H pylori infection

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World Journal of Gastroenterology 2006年第37期12卷 6021-6025页

作者： Thai V nguyen Marcel JR Janssen Paulien Gritters René HM te Morsche Joost PH Drenth Henri van Asten Robert JF Laheij Jan BMJ Jansen Department of Gastroenterology Can Tho University of Medicine and Pharmacy Can Tho Viet Nam Department of Gastroenterology and Hepatology Radboud University Nijmegen Medical Centre Nijmegen The Netherlands Nijmegen Institute for International Health Radboud University Nijmegen Medical Centre Nijmegen The Netherlands

AIM： To investigate the relationship between mucin 6 （MUC6） VNTR length and Hpylori infection. METHODS： Blood samples were collected from patients visiting the Can Tho General Hospital for upper gastrointestinal endoscopy. DNA was isolated from whole blood, the repeated section was cut out using a restriction enzyme （Pvu 11） and the length of the allele fragments was determined by Southern blotting. Hpylori infection was diagnosed by ^14C urea breath test. For analysis, MUC6 allele fragment length was dichotomized as being either long （〉 13.5 kbp） or short （≤ 13.5 kbp） and patients were classified according to genotype [long- long （LL）, long-short （LS）, short-short （SS）]. RESULTS： 160 patients were studied （mean age 43 years, 36% were males, 58% H pylori positive）. MUC6 PvuⅡ-restricted allele fragment lengths ranged from 7 to 19 kbp. Of the patients with the LL, LS, SS MUC6 genotype, 43% （24/56）, 57% （25/58） and 76% （11/46） were infected with Hpylori, respectively （P = 0.003）. CONCLUSION： Short MUC6 alleles are associated with H pylori infection.

关键词： H pylori Mucin 6 Polymorphism Variable number of tandem repeats