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Isolation and Identification of Two Flavonoid Compounds from Acclimatized Angelica acutiloba Kitagawa Growing in Vietnam

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World Journal of Traditional Chinese Medicine 2022年第3期8卷 413-416页

作者： thi Minh Tam Pham thi Thu Cuc le Viet Hung Tran Van thanh Nguyen Department of Microbiology Institute of Drug Quality ControlDepartment of Analytical Chemistry and Quality ControlUniversity of Medicine and PharmacyHo Chi Minh CityVietnam Department of Analytical Chemistry and Quality Control Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam Department of Microbiology Institute of Drug Quality ControlHo Chi Minh CityVietnam

Traditional Vietnamese Medicine has its own development based on the local endemic herbs,but it also inherits from Traditional Chinese Medicine using Chinese herbal *** the history of cultural exchange between two countries,the adoption of Chinese Danggui,Angelica sinensis(Oliv.)Diels.,has been made by Vietnamese traditional medicine practitioners for a long ***,the acclimatization has never been *** Danggui,or Angelica acutiloba Kitagawa,is recently being acclimatized and cultivated in several Vietnamese *** the huge climate change between the two countries,the herb adapted exquisitely well to the humid tropical ***,so far,there are no studies that have evaluated the effect of acclimatization on the overall quality of this medicinal *** aim of our study is screening secondary metabolites of this acclimatized herb for new natural compound(s),if *** analysis of flavonoid fraction from this herb led to the identification of two known compounds which previously have not been isolated from this species *** detection showed that the herb has reacted to the new environment.

关键词： Abiotic stress Angelica acutiloba danggui isoquercitrin rutin

An improved CRNN for Vietnamese Identity Card Information Recognition

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Computer Systems Science & Engineering 2022年第2期40卷 539-555页

作者： Trinh Tan Dat le Tran Anh Dang Nguyen Nhat Truong Pham Cung le thien Vu Vu Ngoc thanh Sang Pham thi Vuong Pham The Bao Information Science Faculty Sai Gon UniversityHCM City700000Vietnam Faculty of Electrical&Electronics Engineering University of TechnologyHCM City700000Vietnam

this paper proposes an enhancement of an automatic text recognition system for extracting information from the front side of the Vietnamese citizen identity(CID)***,we apply Mask-RCNN to segment and align the CID card from the ***,we present two approaches to detect the CID card’s text lines using traditional image processing techniques compared to the EAST ***,we introduce a new end-to-end Convolutional Recurrent Neural Network(CRNN)model based on a combination of Connectionist Temporal Classification(CTC)and attention mechanism for Vietnamese text recognition by jointly train the CTC and attention objective functions *** length of the CTC’s output label sequence is applied to the attention-based decoder prediction to make the final label *** process helps to decrease irregular alignments and speed up the label sequence estimation during training and inference,instead of only relying on a data-driven attention-based encoder-decoder to estimate the label sequence in long *** may directly learn the proposed model from a sequence of words without detailed *** evaluate the proposed system using a real collected Vietnamese CID card dataset and find that our method provides a 4.28%in WER and outperforms the common techniques.

关键词： Vietnamese text recognition OCR CRNN BLSTM attention mechanism joint CTC-Attention

头痛合剂治疗紧张型头痛伴焦虑患者的临床疗效分析

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中国现代药物应用 2024年第9期18卷 33-36页

作者：李响窦向红宣乐乐东海县人民医院神经内科 222300

目的探讨紧张型头痛(TTH)伴焦虑患者采取头痛合剂治疗的临床疗效。方法选择100例TTH伴焦虑患者,以双色球法分为对照组与观察组,每组50例。对照组实施常规西医治疗,观察组实施常规西医治疗联合头痛合剂治疗。比较两组中医证候积分、临床... 详细信息

目的探讨紧张型头痛(TTH)伴焦虑患者采取头痛合剂治疗的临床疗效。方法选择100例TTH伴焦虑患者,以双色球法分为对照组与观察组,每组50例。对照组实施常规西医治疗,观察组实施常规西医治疗联合头痛合剂治疗。比较两组中医证候积分、临床疗效、负面心理情绪、生化指标[同型半胱氨酸(Hcy)、纤维蛋白原、血浆粘度、全血粘度]、头痛频率与持续时间。结果与对照组总有效率比较观察组更高,差异显著(94.00%VS 78.00%,P<0.05)。治疗后,观察组Hcy(10.85±2.95)μmol/L、纤维蛋白原(2.41±0.32)g/L、全血粘度(9.11±2.36)mPa·s、血浆粘度(1.15±0.38)mPa·s均低于对照组的(12.12±3.05)μmol/L、(3.05±0.48)g/L、(10.59±2.75)mPa·s、(1.45±0.42)mPa·s,差异显著(P<0.05)。治疗后,观察组头痛、昏蒙、面色苍白、胸胁满闷、纳呆呕恶积分分别为(0.92±0.22)、(0.82±0.15)、(0.78±0.18)、(0.85±0.21)、(0.89±0.24)分,低于对照组的(1.25±0.26)、(1.18±0.22)、(1.16±0.20)、(1.23±0.25)、(1.24±0.28)分,差异显著(P<0.05)。治疗后,观察组头痛频率低于对照组,头痛持续时间短于对照组,差异显著(P<0.05)。治疗后,观察组焦虑评分、抑郁评分低于对照组,差异显著(P<0.05)。结论TTH伴焦虑患者予以常规西医基础上联合头痛合剂治疗,能更好地缓解患者的焦虑情绪,并更好地减轻患者的头痛症状,有利于生化指标的改善,从而全面提升临床效果,值得临床应用。

关键词：紧张型头痛焦虑头痛合剂生化指标中医证候积分临床疗效

Carboxymethyl starch cross-linked by electron beam radiation in presence of acrylic acid sensitizer

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Nuclear Science and Techniques 2013年第B12期24卷 19-22页

作者： Doan Binh Nguyen thanh Duoc Pham thi Thu Hong R & D Center for Radiation Technology Vietnam Atomic Energy Institute 202A St. 11 Linh Xuan Ward Thu Duc District Ho Chi Minh City Vietnam

Carboxymethyl starch (CMS) can be cross-linked by electron beam radiation to form a biocompatible and environment-friendly hydrogel at a high absorbed dose and a condensed CMS concentration. Acrylic acid (AAc) can be used as a sensitizer in order to reduce the absorbed doses to an acceptable certain level. At an absorbed dose of 3?4 kGy, the gel content of crosslinked CMS can be obtained about 50% with 5% (w/w) AAc concentration used. The compressive strength of CMS samples increased with increasing their cross-linked densities due to raising absorbed doses. The swelling ratio of cross-linked CMS was also attainable at a maximum of 50 times in the distilled water. The enzymatic degradation of cross-linked CMS was carried out in acetate buffer pH 4.6 with 0.1% α-amylase enzymatic solution incubated at 40oC for 6 h. The crosslinked CMS samples were degraded slower than uncrosslinked CMS ones. The results indicated that the highly cross-linked CMS was almost fully degradable when the enzymatic hydrolysis was performed during 6 h. The FT IR spectra of cross-linked CMS in the presence of AAc were examined to observe the carboxyl group of AAc in the structure of cross-linked CMS. The hydrophilic of cross-linked CMS surface was determined by a contact-angle analysis.

关键词：交联密度羧甲基淀粉电子束辐射丙烯酸敏化剂 FT-IR光谱吸收剂量 CMS

In vivo anticancer activity of maesopsin 4—O— β—glucoside isolated from leaves of Artocarpus tonkinensis *** Gagnep

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Asian Pacific Journal of Tropical Medicine 2016年第4期9卷 343-348页

作者： Trinh thi Thuy Dao Duc thien Tran Quang Hung Nguyen thanh Tam Nguyen thi Hoang Anh Nguyen thi Nga Nguyen thi Cuc le Phuong Mai Tran Van Sung Domenico V.Delfino Do thi Thao Institute of Chemistry.Vietnam Academy of Science and Technology Institute of Biotechnology Vietnam Academy of Science and Technology National Research Council Canada Measurement Science and Standards1200 Montreal RoadBuilding M-12.Ottatca.Ontario KIA OR6 Department of Medicine University of PerugiaPiazzale Gambuli.S.Andrea delle Fratte

Objective:To investigate the antitumor effect of maesopsin 4-O-β-glucoside(TAT2) isolated from the leaves of Artocarpus tonkinensis(***) *** ***:The antitumor activity of TAT2 was evaluated in lewis lung carcinoma(LLC) tumor-bearing ***/c mice had tumors induced by implantation with 2× 10~6 LLC cells into the subcutaneous right posterior ***-bearing mice were treated orally with a range of doses of TAT2 and a standard drug,*** were observed for tumor growth and mortality *** was collected to determine hematological and biochemical *** TAT2 was isolated from an ethanolic extract of *** *** structure was determined by MS and NMR spectroscopy,and identified as *** compound did not show acute toxicity at the highest dose tested(2 OIK) mg/kg body weight).TAT2 exhibited antitumor activity by decreasing tumor growth,increasing the survival rale,and ameliorating some hematological and biochemical parameters at doses of 100 and 200 mg/kg body weight(Plear antitumor *** to its bioavailability and low toxicity,and the fact that it could be isolated in a large scale from *** leaves,the compound shows promise as a potential anticancer drug.

关键词： Artocarpus tonkinensis BALB/c Hematological parameters lewis lung carcinoma Maesopsin 4-0-β-glucoside

An Efficient Adaptive Hierarchical Sliding Mode Control Strategy Using Neural Networks for 3D Overhead Cranes

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International Journal of Automation and computing 2019年第5期16卷 614-627页

作者： Viet-Anh le Hai-xuan le Linh Nguyen Minh-xuan Phan Department of Automatic Control Hanoi University of Science and TechnologyHanoi 10000Vietnam Centre for Autonomous Systems University of Technology SydneyNew South Wales 2007Australia

In this paper, a new adaptive hierarchical sliding mode control scheme for a 3D overhead crane system is proposed. A controller is first designed by the use of a hierarchical structure of two first-order sliding surfaces represented by two actuated and un-actuated subsystems in the bridge crane. Parameters of the controller are then intelligently estimated, where uncertain parameters due to disturbances in the 3D overhead crane dynamic model are proposed to be represented by radial basis function networks whose weights are derived from a Lyapunov function. The proposed approach allows the crane system to be robust under uncertainty conditions in which some uncertain and unknown parameters are highly difficult to determine. Moreover, stability of the sliding surfaces is proved to be guaranteed. Effectiveness of the proposed approach is then demonstrated by implementing the algorithm in both synthetic and reallife systems, where the results obtained by our method are highly promising.

关键词： 3D overhead crane adaptive control hierarchical sliding mode control neural network radial basis function

Zirconium metal organic framework for design of tetragonal rare earth-doped zirconia nanoparticles

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Journal of Rare Earths 2019年第11期37卷 1230-1236页

作者： Lam thi Kieu Giang Lukasz Marciniak Krzysztof Kamil Zur Dinh Manh Tien Nguyen Vu Nguyen thanh Binh Tran Kim Anh le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiViet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiViet Nam Institute of Low Temperature and Structural Research Polish Academy of Sciencesul.Okolna 250-422 WroclawPoland Faculty of Mechanical Engineering Bialystok University of TechnologyWiejska 45C15-351 BialystokPoland Institute of Applied Physics and Scientific Instrument Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiViet Nam Duy Tan University 03 Quang TrungDa NangViet Nam

Zirconium metal-organic frameworks ZrOBDC(where BDC=C6H4(COOH)2,terephthalic acid)doped and co-doped with rare earth ions Ln(ZrOBDC:Ln^3+,where Ln^3+=Eu3+and Tb^3+as well as Er^3+and Yb^3+)were used as precursors for the design of tetragonal rare earth doped zirconia nanoparticles(t-ZrO2:Ln^3+NPs)through annealing ***,characterization and luminescence properties of ZrOBDC:Ln^3+and ZrO2:Ln^3+NPs were *** as-obtained t-ZrO2:Ln^3+NPs have high purity with an average size of 20-30 *** luminescence spectra of ZrOBDC:Tb^3+and ZrOBDC:Eu3+display strong green and red emission at around 544 and 611 nm which correspond to 5D4→7F5 and 5D0→7F2 transitions of Tb^3+and Eu3+ions,*** green and red up-conversion emissions of ZrO2:Er^3+,Yb^3+NPs due to 2H11/2,4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of the Er^3+ions are observed under 976 nm laser excitation.

关键词： Zirconium Rare earth ZrOBDC ZrOBDC:Ln3+ ZrO2:Ln3+ Up-conversion

Synthesis and characterization of core/shell structured nanophosphors CePO_4:Tb@LaPO_4 by solvothermal method

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Journal of Rare Earths 2011年第12期29卷 1147-1151页

作者： Dinh xuan Loc Tran thi Kim Chi Tran Thu Huong Nguyen Vu Tran Kim Anh Wieslaw Strek le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology Institute of Low Temperature and Structure Research Polish Academy of Sciences(PAN) University of Engineering and Technology

Core/shell structured CePO4：Tb（Ⅲ）@LaPO4 and CePOa：Tb（Ⅲ） were successfully synthesized in tris（2-ethylhexyl） phosphate （TEHP） and diethylene glycol （DEG） solvents for comparison of the two techniques in open air and closed reaction vessel. Morphology and crystal structure of the core/shell nanophosphors were determined by using X-ray diffraction （XRD） and transmission electron microscopy （TEM）, which showed that nanophosphors had diameter of about 5-10 nm with the monoclinic monazite phase. The nanophosphors obtained by close vessel procedure showed smaller size, more homogeneity and pure crystallite. The luminescent measurements were done upon the different excitation wavelengths in ultraviolet region and at room temperatm＇e to elucidate the influences of the used solvents and the reaction temperatures. It was found that CePO4：Tb@LaPO4 preparedby the close vessel synthesis showed the intensity of green band of the transfer from 5D4 to 7F5 energy level, which was strongly increased, and the luminescent decay time was 3.2 ms, which was longer than that of naked CePO4：Tb phosphor.

关键词： solvothermal synthesis luminescence CePOn:Tb CePOa:Tb@LaPO4 rare earths

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星载二维转台U型架结构轻量化与优化设计

中国光学（中英文） 2024年第4期17卷 896-908页

作者：魏钰轩王振宇李治国黄乐弘杨凯马玉宝中国科学院西安光学精密机械研究所陕西西安710119 中国科学院大学北京100049 中国科学院空间精密测量技术重点实验室陕西西安710119

星载二维转台是空间相机等光电设备的主要承载机构,U型架是转台的关键支撑部件。为了对星载二维转台U型架进行结构优化与轻量化设计,研制高承载比和轻量化的星载二维转台,本文设计了一种用于星载二维转台的碳纤维复合材料U型架。首先,... 详细信息

星载二维转台是空间相机等光电设备的主要承载机构,U型架是转台的关键支撑部件。为了对星载二维转台U型架进行结构优化与轻量化设计,研制高承载比和轻量化的星载二维转台,本文设计了一种用于星载二维转台的碳纤维复合材料U型架。首先,利用碳纤维复合材料代替钛合金材料,结合考虑工艺性,设计了一种变截面管状结构U型架。接着,按照基于铺层工艺的有限元建模方法对碳纤维U型架进行有限元建模与仿真分析。然后,试制U型架样机并通过模态试验验证有限元模型的准确性。最后,提出一种理论分析法、遗传算法、有限元法相结合的三级优化方法对碳纤维U型架铺层角度、铺层厚度与铺层顺序进行优化设计。结果表明:模态试验与仿真得到的U型架振型完全一致,频率相差在5%以内。初始设计的碳纤维U型架比钛合金U型架质量减少了45.7%,通过对复合材料铺层的优化设计,使U型架质量进一步减少了13.8%,固有频率提升了10.14%。本文所采用的复合材料建模与优化方法正确,设计的碳纤维U型架满足星载二维转台轻量化设计需求。

关键词：结构优化设计轻量化设计碳纤维复合材料有限元分析星载二维转台遗传算法