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Journal of Materials Science & Technology 2015年第5期31卷 479-483页

作者： nguyen Van Chuc Cao thi thanh nguyen Van Tu Vuong T.Q Phuong Pham Viet Thang Ngo thi thanh Tam Institute of Materials Science Vietnam Academy of Science and Technology Hanoi University of Science Vietnam National University

In this study,graphene-carbon nanotube（CNT） hybrid films were directly synthesized on polycrystalline copper（Cu） substrates by thermal chemical vapor deposition（CVD） *** films were synthesized on Cu substrate at 1000 ℃ in mixture of gases:argon（Ar）,hydrogen（H2）,and methane（CH4）.Then,carbon nanotubes（CNTs） were grown uniformly on the surface of graphene/Cu films at 750 ℃ in mixture of Ar,*** acetylene（C2H2） *** salt FeCl3solution deposited onto the surface of graphene/Cu substrate by spin coating method was used as precursor for the growth of the *** density and quality of the CNTs on the surface of graphene/Cu films can be controlled by varying the concentration of FeCl3salt catalyst.

关键词： Graphene Carbon nanotube(CNT) Hybrid films Copper

Hybrid model to optimize object-based land cover classification by meta-heuristic algorithm:an example for supporting urban management in Ha Noi,Viet Nam

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International Journal of Digital Earth 2019年第10期12卷 1118-1132页

作者： Quang-thanh Bui Manh Pham Van nguyen thi thuy Hang Quoc-Huy nguyen nguyen Xuan Linh Pham Minh Hai Tran Anh Tuan Pham Van Cu Center for Applied Research in Remote sensing and GIS(CARGIS) VNU University of ScienceHa NoiViet Nam VNU University of Science Ha NoiViet Nam Vietnam Institute of Geodesy and Cartography Ha NoiViet Nam Ministry of Education and Training Ha NoiViet Nam

this study proposed a novel object-based hybrid classification model named GMNN that combines Grasshopper Optimization Algorithm(GOA)and the multiple-class Neural network(MNN)for urban pattern detection in Hanoi,*** bands of SPOT 7 image and derivable NDVI,NDWI were used to generate image segments with associated attributes by PCI Geomatics *** segments were classified into four urban surface types(namely water,impervious surface,vegetation and bare soil)by the proposed ***,three training and validation datasets of different sizes were used to verify the robustness of this *** all tests,the overall accuracies of the classification were approximately 87%,and the Area under Receiver Operating Characteristic curves for each land cover type was ***,the performance of this model was examined by comparing several statistical indicators with common benchmark *** results showed that GMNN out-performed established methods in all comparable *** results suggested that our hybrid model was successfully deployed in the study area and could be used as an alternative classification method for urban land cover *** a broader sense,classification methods will be enriched with the active and fast-growing contribution of metaheuristic algorithms.

关键词： Urban remote sensing object-based classification neural network grasshopper optimization algorithm

EXISTENCE AND STABILITY OF PERIODIC AND ALMOST PERIODIC SOLUTIONS TO THE BOUSSINESQ SYSTEM IN UNBOUNDED DOMAINS

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Acta Mathematica Scientia 2022年第5期42卷 1875-1901页

作者： thieu Huy nguyen Truong Xuan PHAM thi Ngoc Ha VU The Sac LE School of Applied Mathematics and Informatics Hanoi University of Science and Technology Vien Toan ung dung va Tin hocDai hoc Bach khoa Hanoi 1DaiCoVietHanoiVietnam Department of Mathematics Faculty of Information TechnologyThuyloi university Khoa Cong nghe Thong tinBo mon ToanDai hoc Thuy loi175 Tay SonDong DaHa NoiViet Nam thuyloi University Dai hoc Thuy Loi175 Tay SonDong DaHanoiViet Nam

In this paper we investigate the existence and stability of periodic solutions(on a half-line R_(+))and almost periodic solutions on the whole line time-axis R to the Boussinesq system on several classes of unbounded domains of R^(n) in the framework of interpolation *** the linear Boussinesq system we combine the L^(p)—L^(q)-smoothing estimates and interpolation functors to prove the existence of bounded mild ***,we prove the existence of periodic solutions by invoking Massera’s *** also prove the existence of almost periodic *** we use the results of the linear Boussinesq system to establish the existence,uniqueness and stability of the small periodic and almost periodic solutions to the Boussinesq system using fixed point arguments and interpolation *** results cover and extend the previous ones obtained in[13,34,38].

关键词： Boussinesq systems periodic solutions almost periodic solutions unbounded domains smoothing estimates dual estimates interpolation spaces stability

达格列净对不伴糖尿病心力衰竭患者治疗过程中RAAS系统的影响研究

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达格列净对不伴糖尿病心力衰竭患者治疗过程中RAAS系统的影响研究

作者： nguyen thi thanh HUYEN 大理大学

学位级别：硕士

目的:研究非糖尿病心力衰竭(Heart Failure,HF)患者应用达格列净治疗后血浆中血浆肾素浓度(Plasma renin concentration,PRC)、血浆血管紧张素Ⅱ(angiotensinⅡ,ANG-II)、血浆醛固酮(Aldosterone,ALD)的浓度水平变化情况,探讨达格列净... 详细信息

目的:研究非糖尿病心力衰竭(Heart Failure,HF)患者应用达格列净治疗后血浆中血浆肾素浓度(Plasma renin concentration,PRC)、血浆血管紧张素Ⅱ(angiotensinⅡ,ANG-II)、血浆醛固酮(Aldosterone,ALD)的浓度水平变化情况,探讨达格列净对不伴糖尿病心力衰竭患者RAAS系统影响。方法:选取2021年7月至2022年10月于大理大学第一附属医院心内科收治102例非糖尿病心力衰竭患者为研究对象,44名常规治疗的患者纳入对照组,58名在常规治疗基础上口服达格列净的患者纳入实验组。记录患者一般情况,并分别在服药前及服药后第7天测定患者一般实验室指标(血尿酸、血糖、肌酐、总胆固醇、甘油三酯、血钾、血钠、低密度脂蛋白胆固醇)、BNP值、RAAS系统(PRC、ANG-II、ALD)、左室射血分数(LVEF)、心功能等级。记录两组患者基础资料以及治疗期间心衰症状、心肾功能及RAAS系统相关指标的变化情况并进行对比。结果:1.实验组患者NYHA心功能分级I级从1例(1.72%)经治疗后升到12例(20.68%);心功能II级从5例(8.62%)上升至45例(77.59%);心功能III级从40例(68.89%)降低0例(0.00%),心功能IV级从12例(20.68%)降到1例(1.72%),治疗前后心功能分级分布差异有统计学差异(P0.05)。治疗前后实验组患者均进行生命体征、Glu、TC、TG、Cr、UA,K、Na复查未出现明显异常,未发生不良反应事件,说明达格列净治疗于心衰是安全的。3.治疗后实验组BNP值为(434.55±418.40)pg/ml,对照组为(619.33±453.37)pg/ml,实验组低于对照组,组间差异具有统计学意义(P0.05);经治疗,实验组患者的PRC值显著下降至(11.58±4.77)pg/ml,差异具有统计学意义(P0.05);经治疗,实验组患者的ALD值显著下降至(65.47±12.01)pg/ml,差异具有统计学意义(P0.05)。比较两组患者治疗前后差值,实验组ALD(pg/ml)(19.05±20.16),与对照组(2.29±16.07)结果显示,实验组显著高于对照组具有统计学意义(P0.05);经治疗,实验组与对照组均显著下降,治疗前后差异均具有统计学意义(P0.05)。结论:1.达格列净可显著降低不伴糖尿病心力衰竭患者心功能分级和BNP值,且安全性佳。2.达格列净可显著降PRC、Ang-II、ALD浓度水平,且治疗效果不受性别和其他药物的影响。提示达格列净可能具有抑制RASS系统的作用。

关键词：达格列净心力衰竭 RAAS系统 SGLT2

CONVERGENCE RESULTS FOR NON-OVERLAP SCHWARZ WAVEFORM RELAXATION ALGORITHM WITH CHANGING TRANSMISSION CONDITIONS

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Acta Mathematica Scientia 2022年第1期42卷 105-126页

作者： Minh-Phuong TRAN thanh-Nhan nguyen Phuoc-Toan HUYNH Nhu-Binh LY Minh-Dang nguyen Quoc-Anh HO Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh cityVietnam Department of Mathematics Ho Chi Minh City University of EducationHo Chi Minh cityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh cityVietnam

In this paper,we establish a new algorithm to the non-overlapping Schwarz domain decomposition methods with changing transmission conditions for solving one dimensional advection reaction diffusion *** precisely,we first describe the new algorithm and prove the convergence results under several natural assumptions on the sequences of parameters which determine the transmission *** we give a simple method to estimate the new value of parameters in each *** interesting advantage of our method is that one may update the better parameters in each iteration to save the computational cost for optimizing the parameters after many *** some numerical experiments are performed to show the behavior of the convergence rate for the new method.

关键词： domain decomposition method Schwarz waveform relaxation algorithm advection reaction diffusion changing transmission conditions

20-Hydroxyecdysone from Dacrycarpus imbricatus bark inhibits the proliferation of acute myeloid leukemia cells

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Asian Pacific Journal of Tropical Medicine 2017年第2期10卷 151-153页

作者： Trinh thi thuy nguyen thanh Tam nguyen thi Hoang Anh Dang Viet Hau Dinh thi Phong Le Quoc Thang Sabrina Adorisio Tran Van Sung Domenico V Delfino Institute of Chemistry Vietnam Academy of Science and Technology Vietnam National Museum of Nature Vietnam Academy of Science and Technology Hue University’s College of Educations Section of Pharmacology Department of MedicineUniversity of Perugia

Objective:To investigate the anti-proliferative effects of 20-hydroxyecdysone isolated from the bark of Dacrycarpus imbricatus(Blume) de ***:Column chromatography was used for isolation of compounds from plant *** structure of the isolated compound was identified by mass spectrometry and nuclear magnetic resonance techniques,including HSQC,HMBC,NOE-difference *** isolated compound was tested for its anti-proliferative activity in acute myeloid leukemia(AML) and OCI-AML ***:Compound 1 was isolated from the ethyl acetate fraction of Dacrycarpus imbricatus barks by column *** chemical structure was identified as 20-hydroxyecdysone(20HE),a cholestane-type ecdysteroid,by a combination of mass spectrometry and nuclear magnetic resonance spectrometric *** goal was to test the anti-proliferative activity of 20 HE using the OCI-AML cell line.20 HE significantly decreased OCI cell number at a concentration of 1 mg/mL,whereas lower concentrations were ***,this decrease was due to partial blockage of the G_1/S phase of the cell cycle,with a reduction of cells in the G_2M phase,not due to increased ***:this indicates that 20 HE significantly decreases the number of cells in the G_1/S phase of the cell cycle in human AML *** is the first time that the anti-proliferative activity of 20 HE against a human tumor cell line has been reported.

关键词： Dacrycarpus imbricatus Ecdysteroid 20-hydroxyecdysone Proliferation Acute myeloid leukemia

Rapid and efficient characterization of cervical collagen orientation using linearly polarized colposcopic images

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Journal of Innovative Optical Health Sciences 2023年第5期16卷 21-31页

作者： Cat Phan Ngoc Khuong Dung nguyen Huu Quang Hai Pham thanh Long nguyen Quynh nguyen Ngoc Duc Le Huynh Tien Tran Van Tu Ly Anh Department of Applied Physics Ho Chi Minh City University of Technology 268 Ly Thuong Kiet Street District 10 Ho Chi Minh City 700000Vietnam Quality Management Department Tu Du Hospital 284 Cong QuynhDistrict 1 Ho Chi Minh City 700000Vietnam Department of Biomedical Engineering nguyen Tat thanh University 300A Nguyen Tat Thanh District 4Ho Chi Minh City 700000Vietnam Faculty of Science and Technology Jean Monnet University 11 Rue du Docteur Annino Saint Etienne 42000France

Collagen provides tissue strength and structural *** fication of the orientated dispersion of collagen fibers is an important factor when studying the mechanical properties of the *** this study,for the first time,a new method for rapid characterization of the collagen fiber orientations of the cervix using linearly polarized light colposcopy is presented.A total of 24 colposcopic images were captured using a cross-polarized imaging system with white LED light *** the preprocessing stage,the Red channel of the RGB image was chosen,which contains no information of the blood vessels because of the low-absorption of blood cells in the red ***,which is an ImageJ plug-in,was used to estimate the local orientation of the collagen *** result shows that in the nonpregnant cervix,the middle zone(Zone 2)has circumferentially aligned collagen fibers while the inner zone(Zone 1)has randomly *** collagen fiber dispersion in Zone 2 is much smaller than that in Zone 1 at all four quadrants region(anterior,posterior,left,and right quadrant).this new analysis technique could potentially combine with diagnostic tools to provide a quantitative platform of collagen fibers in the clinic.

关键词： Cervix collagen fibers collagen orientation coherency cross-polarized imaging colposcopy

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越南学生对汉语网络语言的认知及态度研究

越南学生对汉语网络语言的认知及态度研究

作者： nguyen thi thuy TRANG（阮紫彤）郑州大学

学位级别：硕士

随着互联网的迅速发展与普及,大量的网络用语应运而出。近年来接地气的网络词语经常出现在中国政府部门文件以及领导人发言当中。为了与时俱进,作为新中国第一部规范性词典——《现代汉语词典》也收录了被广泛使用且稳定性强的网络新词... 详细信息

随着互联网的迅速发展与普及,大量的网络用语应运而出。近年来接地气的网络词语经常出现在中国政府部门文件以及领导人发言当中。为了与时俱进,作为新中国第一部规范性词典——《现代汉语词典》也收录了被广泛使用且稳定性强的网络新词语。这表明了汉语网络语言已经由小众的专利变成了大众共建、共用、共享的语言产品。汉语网络语言已经渐渐步入人们的日常生活中并成为汉语不可或缺的组成部分。随着中国在国际上的影响力不断扩大,汉语的地位也显著提高,“汉语热”席卷全球,学习汉语的人数不断增加。海外汉语学习者以年轻人居多,该群体对新事物的包容性和接受能力也更强,因此汉语网络语言是他们关注的新焦点,同时也对他们的第二语言学习(即汉语学习)带来巨大的影响。中国与越南是山水相连的友好邻邦。越南本地的汉语教学得到了政府部门的高度重视与大力支持,学习汉语的人数不断创新高,赴华留学的越南留学生也越来越多。越南学生是海外汉语学习者的重要组成部分。目前,网络语言本体研究已获得较为丰硕的成果,但是网络语言在国际中文教育中尚未受到足够的重视。那么,在网络语言实际教学中,教师该“教什么”、“怎么教”才能趋利避害?越南学生对汉语网络语言的认知与态度如何?本文主要采用文献研究法、问卷调查法和综合分析法等方法进行研究。笔者对高级阶段的越南学生进行问卷调查,通过分析调查结果了解越南学生对汉语网络语言的认知、使用情况及态度等问题。调查结果显示,高级阶段的越南学生对汉语网络语言的认知程度与使用频率较高,对汉语网络语言及网络语言教学大多持支持态度。此外,研究还表明,学习时间长短、在中国生活情况、使用汉语交流的频率以及使用中国社交软件的频率等四个因素都直接影响到学生对网络语言的认知程度。之后,笔者基于前人的研究成果,结合实际情况与调查问卷结果,从教师、学生以及学校等三个角度提出汉语网络语言教学与学习的建议。希望本论文能够帮助包括越南学生在内的外国学生加深对汉语网络语言的了解,从而正确运用汉语网络语言,也希望能够为这方面的研究提供新的视角和方向,起到抛砖引玉的作用,为以后的研究尽绵薄之力。

关键词：网络语言越南学生认知态度教学策略

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 40°C 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. © 2013, Science Press. All rights reserved.

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

Assessing Asian Economies Renewable Energy Consumption Efficiency Using DEA with Undesirable Output

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Computer Systems Science & Engineering 2022年第10期43卷 347-362页

作者： Chia-Nan Wang Ngoc-Ai-Thy nguyen thanh-Tuan Dang Jing-Wein Wang Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Logistics and Supply Chain Management Hong Bang International UniversityHo Chi Minh723000Vietnam Institute of Photonics Engineering National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan

Along with vast non-fossil potential and significant expertise,there is a question of whether Asian nations are attaining efficient consumption and exploitation of renewable *** this perspective,the paper aims to evaluate the efficiency of 14 potential Asia countries in renewable energy consumption during the six-year periods(2014-2019).In analyzing the performance of the renewable energy sector,the data envelopment analysis(DEA)with an undesirable output model approach has been widely utilized to measure the efficiency of peer units compared with the best practice *** consider four inputs and two outputs to a DEA-based efficiency *** force,total energy consumption,share of renewable energy,and total renewable energy capacity are *** outputs consist of CO_(2)emissions as an undesirable output and gross domestic product as a desirable *** results show that United Arab Emirates,Saudi Arabia,Japan,and South Korea consistently outperform in the evaluation,achieving perfect efficiency scores during the research *** is found to have the lowest average efficiency of renewable energy utilization.

关键词： Asia renewable energy efficiency frontier data envelopment analysis bad output