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Efficient Generalized Inverse for Solving Simultaneous Linear Equations

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Journal of Applied Mathematics and Physics 2016年第1期4卷 16-20页

作者： S. Kadiam Bose D. t. nguyen Structural technologies Strong Point LLC Baltimore MD USA Department of Civil and Environmental Engineering Old Dominion University Norfolk VA USA

Solving large scale system of Simultaneous Linear Equations (SLE) has been (and continue to be) a major challenging problem for many real-world engineering and science applications. Solving SLE with singular coefficient matrices arises from various engineering and sciences applications [1]-[6]. In this paper, efficient numerical procedures for finding the generalized (or pseudo) inverse of a general (square/rectangle, symmetrical/unsymmetrical, non-singular/singular) matrix and solving systems of Simultaneous Linear Equations (SLE) are formulated and explained. the developed procedures and its associated computer software (under MAtLAB [7] computer environment) have been based on “special Cholesky factorization schemes” (for a singular matrix). test matrices from different fields of applications have been chosen, tested and compared with other existing algorithms. the results of the numerical tests have indicated that the developed procedures are far more efficient than the existing algorithms.

关键词： Generalized Inverse Algorithms Simultaneous Linear Systems Matrix Inverse Singular Matrix Pseudo Inverse Cholesky Factorization

Anti‐sloshing control:Flatness‐based trajectory planning and tracking control with an integrated extended state observer

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IEt Cyber-Systems and Robotics 2024年第3期6卷 31-48页

作者： Khanh nguyen Viet Minh Do Duc thanh Cao Duc tung Lam nguyen School of Electrical and Electronic Engineering Hanoi University of Science and TechnologyHanoiVietnam Vietnam Maritime University HaiphongVietnam

the phenomenon of sloshing causes a significantly negative impact on a wide range of industries.A time‐optimal flatness‐based trajectory planning and Lyapunov‐based model predictive control(LMPC)is proposed for trajectory tracking of a transmitting cylindrical container filled with ***,this research presents an equivalent discrete model based on a mass‐spring‐damper ***,after the flatness of the adopted non‐linear model for 2D is established,time‐optimal trajectories are introduced.A control method called LMPC is shown to solve the problem of orbital tracking,which allows setting limits for state *** addition,to ensure system performance,a linear extended state observer(LESO)is integrated to cope with system ***,the efficiency of the proposed approach for liquid sloshing suppression and tracking is illustrated by simulations.

关键词： control dynamic model motion planning

Influence of Chitosan Binder on the Adhesion of Silver Nanoparticles on Cotton Fabric and Evaluation of Antibacterial Activity

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Advances in Nanoparticles 2015年第4期4卷 98-106页

作者： nguyen Quoc Hien Dang Van Phu nguyen Ngoc Duy Le Anh Quoc nguyen t. Kim Lan Hoang t. Dong Quy Huynh t. Hong Van Phan Ha Nu Diem tran thai Hoa Research and Development Center for Radiation technology Vietnam Atomic Energy Institute Ho Chi Minh City Vietnam University of Science Vietnam National University in Ho Chi Minh City Ho Chi Minh City Vietnam College of Science Hue University Hue City Vietnam

Colloidal silver nanoparticles (AgNPs) with particle size less than 10 nm and concentration of 2 mM/L (~200 mg/L) were synthesized by gamma Co-60 ray irradiation of Ag+/chitosan solutions with different chitosan concentration of 0.5%, 1% and 2% (w/v). Incorporation of AgNPs onto cotton fabric was carried out by padding method with 100% wet pick-up. the content of AgNPs deposited on cotton fabric and released from cotton fabric after repeated washing was determined by inductively couple plasma-atomic emission spectroscopy (ICP-AES). the results indicated that cotton/AgNPs fabric made from padding into AgNPs solution with 0.5% - 1% chitosan was the best one of AgNPs adhesion ability on cotton fabric. Results on antibacterial activity against S. aureus showed that cotton/AgNPs fabric with AgNPs content more than 100 mg/kg exhibited highly antibacterial activity (η > 98%). the mechanical property (tensile strength and elongation) of cotton/AgNPs fabrics was almost unchanged in comparison with untreated cotton fabric. thus, the resultant cotton/AgNPs fabric with highly antibacterial activity can be potentially used as bed drapes and/or patient uniforms in hospitals, etc.

关键词： Gamma Co-60 Ray Silver Nanoparticles Chitosan Cotton Fabric Antibacterial

Investigation of current collapse and recovery time due to deep level defect traps inβ-Ga2O3 HEMt

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Journal of Semiconductors 2020年第10期41卷 87-90页

作者： R.Singh t.R.Lenka R.t.Velpula B.Jain H.Q.t.Bui H.P.t.nguyen Department of Electronics&Communication Engineering National Institute of Technology SilcharAS788010India Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNJ07102USA

In this paper,drain current transient characteristics ofβ-Ga2O3 high electron mobility transistor(HEMt)are studied to access current collapse and recovery time due to dynamic population and de-population of deep level traps and interface *** approximately 10 min,and 1 h of recovery time to steady-state drain current value is measured under 1 ms of stress on the gate and drain electrodes due to iron(Fe)–dopedβ-Ga2O3 substrate and germanium(Ge)–dopedβ-Ga2O3 epitaxial layer ***-state current lag is more severe due to widely reported defect trap EC–0.82 e V over EC–0.78 e V,-0.75 e V present in Iron(Fe)-dopedβ-Ga2O3 bulk crystals.A negligible amount of current degradation is observed in the latter case due to the trap level at EC–0.98 e *** is found that occupancy of ionized trap density varied mostly under the gate and gate–source *** investigation of reversible current collapse phenomenon and assessment of recovery time inβ-Ga2O3 HEMt is carried out through 2 D device simulations using appropriate velocity and charge transport *** work can further help in the proper characterization ofβ-Ga2O3 devices to understand temporary and permanent device degradation.

关键词： β-Ga2O3 current collapse degradation HEMt recovery time traps trapping effects

Synthesis of Platin/Carbon XC72R Nanocomposite Using as Electrocatalyst for Direct Methanol Fuel Cells

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Journal of Chemistry and Chemical Engineering 2012年第10期6卷 925-929页

作者： Phong P. t. nguyen Minh H. Ngo Liem t. Ngo thang C. M. nguyen University of Science VNU-HCM HCM City Lac Hong University

Platinum/Carbon XC72R （Pt/C） nanocomposite was synthesized in-situ by polyol method. Precursor of hexahydrated chloroplatinic acid H2PtCI6-6H2O was reduced by EG （ethylene glycol） so as to form Pt nanoparticles which were deposited on the surface of carbon. Pt/C composites （treated or untreated carbon） were synthesized at pH - 6.5 and pH = 11. the XRD pattern of Pt/C showed peaks assigned to the crystalline structure of Pt and carbon. tEM images showed that Pt nanoparticles on carbon were ultrafine spheres and the particles obtained sizes from 2 to 6 nm which are mostly concentrated on size of 3 nm. the electrocatalytic activity of Pt/C catalysts toward methanol oxidation was examined by CV （cyclic voltammetry）. Pt/treated XC72R （pH = 11） at potential （0.69 V） exhibited better electroactivity （628 mA/mg Pt）.

关键词： Nanocomposite platinum/carbon electrocatalyst DMFC (direct methanol fuel cells) cyclic voltammetry.

In vivo tumor ultrasound-switchable fluorescence imaging via intravenous injections of size-controlled thermosensitive nanoparticles

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Nano Research 2023年第1期16卷 1009-1020页

作者： Liqin Ren Yang Liu tingfeng Yao Kytai tnguyen Baohong Yuan Ultrasound and Optical Imaging Laboratory Department of Bioengineeringthe University of Texas at ArlingtonArlingtonTX 76019USA Joint Biomedical Engineering Program the University of Texas at Arlington and the University of Texas Southwestern Medical CenterDallasTX 75390USA Department of Bioengineering the University of Texas at ArlingtonArlingtonTX 76019USA

Near-infrared fluorescence imaging has emerged as a noninvasive,inexpensive,and ionizing-radiation-free monitoring tool for assessing tumor growth and treatment *** particular,ultrasound switchable fluorescence(USF)imaging has been explored with improved imaging sensitivity and spatial resolution in centimeter-deep *** study achieved the size control of polymer-based and indocyanine green(ICG)encapsulated USF contrast agents,capable of accumulating in the tumor after intravenous *** nanoprobes varied in size from 58 to 321 *** bioimaging profiles demonstrated that the proposed nanoparticles can efficiently eliminate the background light from normal tissue and show a tumor-specific fluorescence enhancement in the BxPC-3 tumor-bearing mice models possibly via the enhanced permeability and retention *** vivo tumor USF imaging further demonstrated that these nanoprobes can effectively be switched“ON”with enhanced fluorescence in response to a focused ultrasound stimulation in the tumor microenvironment,contributing to the high-resolution USF ***,our findings suggest that ICG-encapsulated nanoparticles are good candidates for USF imaging of tumors in live animals,indicating their great potential in optical tumor imaging in deep tissue.

关键词： in vivo tumor imaging deep tissue near-infrared(NIR)imaging high resolution ultrasound-switchable fluorescence imaging indocyanine green(ICG)

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一种快速测评涂层金属耐蚀性的电化学方法

中国腐蚀与防护学报 1993年第4期13卷 380-384页

作者：林昌健 nguyen t. 厦门大学 NISt

基于多重动电位扫描的原理,发展了一种新的电化学方法用于快速测评有机涂层/金属的耐蚀性能。通过实验着重研究了该方法的可行性,内容包括:(1)考察在测量条件下外加电化学极化对涂层本身的破坏及对测量结果的影响程度;(2)采用新方法和... 详细信息

基于多重动电位扫描的原理,发展了一种新的电化学方法用于快速测评有机涂层/金属的耐蚀性能。通过实验着重研究了该方法的可行性,内容包括:(1)考察在测量条件下外加电化学极化对涂层本身的破坏及对测量结果的影响程度;(2)采用新方法和交流阻抗技术测量同一实际金属/涂层体系的耐蚀性,通过比较,检验方法的可行性。结果证明,新方法适用于评估表面涂覆有机涂层的金属体系的耐蚀性,数据可信,极化对涂层的破坏作用极微,实际不影响测评结果。

关键词：涂层金属耐蚀性电化学法测量

Identification and confirmation of novel QtLs for aluminum tolerance conferring tissue tolerance mechanism in soybean

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Identification and confirmation of novel QTLs for aluminum t...

江苏省遗传学会2019年学术研讨会

作者：李阳 Heng Ye tri Vuong 李艳 Henry t.nguyen National Key Laboratory of Crop Genetics and Germplasm Enhancement National Center for Soybean Improvement Nanjing Agricultural University Division of Plant Sciences University of Missouri

Aluminum(Al) toxicity is a major abiotic stress limiting crop yield in acidic soil. Al toxicity inhibits plant root growth and development, leading to insufficient uptake of water and nutrient from soil. Soybean is sensitive to Al toxicity, exhibiting impaired root growth under elevated Al concentrations. In this research, two soybean lines(Magellan and PI 567731) were identified to differ in Al tolerance represented by primary root length ratio(PRLatio), total root length ratio(tRLatio), and root tip number ratio(RtNatio) under 25 μM Al3+. the recombinant inbred line(RIL) population derived from the cross of these two lines exhibited high inheritance(0.65 to 0.85) in Al tolerance-related traits. the quantitative trait loci(QtL) mapping identified three QtL on chromosome(Chr.) 3, 13 and 20 associated with Al tolerancerelated traits. qAlm20 explained the largest phenotypic variation of ～ 27.4% and mainly played roles in maintaining root elongation. qAlm03 and q Alm13 were mapped as novel Al tolerance loci and predicted to be mainly involved in maintaining root tip initiation or root elongation under Al stress, respectively. Furthermore, the two major QtL(qAlm13 and qALm20) were confirmed using nearisogenic lines(NILs), and they seemed to regulate Al tolerance in tissue tolerance pathway instead of Al3+ exclusion or transport. the tolerant allele of qALm20 was identified as a rare allele, which has not been widely utilized in soybean breeding. Our results not only provided novel genetic resources for breeding Al tolerant soybean varieties, but also confirmed Al tolerance QtL in the NIL background and proposed the possible mechanisms underlying them.

关键词： Aluminum tolerance Near-isogenic lines QtL mapping Root length Soybean

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捐赠母乳的使用

英国医学杂志中文版 2022年第3期25卷 169-171页

作者： Hoang thi tran tuan t nguyen Roger Mathisen 熊祎(译) 杜忠东(校) Da Nang Hospital for Women and Children Da NangVietnam Alive&thrive Southeast Asia FHI 360HanoiVietnam 首都儿科研究所首都医科大学附属北京儿童医院

在越南中部的大南妇女儿童医院,一名25岁的初产妇孕27周诞下一男婴。这名男婴出生体重仅980 g,他住在新生儿重症监护室,需要进行持续的气道正压通气支持。新生儿重症监护室的护士向她提供母乳喂养宣教和相关支持,出生后前4天,她的宝宝... 详细信息

在越南中部的大南妇女儿童医院,一名25岁的初产妇孕27周诞下一男婴。这名男婴出生体重仅980 g,他住在新生儿重症监护室,需要进行持续的气道正压通气支持。新生儿重症监护室的护士向她提供母乳喂养宣教和相关支持,出生后前4天,她的宝宝接受她自己的母乳以及巴氏灭菌的捐赠母乳。从生后5天起,她已经可以分泌足够的母乳以满足孩子的生理需要。

关键词：新生儿重症监护室妇女儿童医院气道正压通气初产妇捐赠母乳巴氏灭菌出生体重生理需要