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Upconversion luminescence of Gd2O3:Er3+and Gd2O3:Er3+/silica nanophosphors fabricated by EDTA combustion method

Journal of Rare Earths 2019年第11期37卷 1126-1131页

作者： Le Quoc Minh Tran Kim Anh Nguyen Duy Hung Pham Thi Minh Chau Nguyen Thi Quy Hai ho.van tuyen Vu Thi Thai Ha Vu Duc Tu Wieslaw Strek Institute of Theoretical and Applied Research Duy Tan UniversityDa Nang 55000Viet Nam Advanced Institute for Science and Technology Hanoi University of Science and Technology1 Dai Co VietHai Ba TrungHanoiViet Nam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadCau Giay DistrictHanoiViet Nam Institute of Low Temperature and Structure Research Polish Academy of Science 2 OkolnaWroclawPoland

Gd2O3:Er^3+nanophosphors were fabricated by the combustion method in presence of Na2 ethylene diamine tetra acetic acid(EDTA-Na2)as fuel at not high temperature(≤350℃)within a very short time of 5 *** added concentration of Er^3+ions in Gd2O3 matrix was changed from 0.5 mol%to 5.0 mol%.The X-ray diffraction pattern of samples indicates the monoclinic structure of Gd2O3:Er^3+.The morphology and chemical composition analysis of the Gd2O3:Er^3+samples are characterized by a field emission scanning electron microscope(FESEM)and a Fourier-transform infrared spectrometer(FTIR).The photoluminescence(PL),photo luminescence excitation(PLE)and upconversion(UC)at room temperature of the prepared materials with different concentrations of Er^3+were *** PL of Gd2O3:Er^3+nanomaterials are shown in visible at 545,594,623,648,688 nm under excitation at 275 *** emission bands from transitions of Er^3+from 2P3/2 to 4F9/2 are observed,UC luminescent spectra of the Gd2O3:Er^3+/silica nanocomposites under 976 nm excitation show the bands at 548 and 670 *** influence of excitation power at 980 nm for transitions were measured and *** results indicate that the upconversion process of Gd2O3:Er^3+/silica is two photons absorption *** low temperature dependence of UC luminescent intensities of the main bands of Gd2O3:Er^3+was investigated towards development of a nanotemperature sensor in the range of 10-300 K.

关键词： Upconversion luminescence Gd2O3:Er3+ Gd2O3:Er3+/silica Nanophosphors EDTA combustion Rare earths

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Improved flood susceptibility mapping using a best first decision tree integrated with ensemble learning techniques

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Geoscience Frontiers 2021年第3期12卷 333-342页

作者： Binh Thai Pham Abolfazl Jaafari Tran van Phong hoang Phan Hai Yen Tran Thi tuyen Vu van Luong Huu Duy Nguyen Hiep van Le Loke Kok Foong University of Transport Technology Ha Noi 100000Viet Nam Research Institute of Forests and Rangelands Agricultural ResearchEducation and Extension Organization(AREEO)TehranIran Institute of Geological Sciences Vietnam Academy of Sciences and Technology84 Chua Lang StreetDong daHa NoiViet Nam Department of Geography School of Social EducationVinh UniversityViet Nam Department of Resource and Environment Management School of Agriculture and ResourcesVinh UniversityViet Nam Faculty of Geography VNU University of Science334 Nguyen TraiHa NoiViet Nam Institute of Research and Development Duy Tan UniversityDa Nang 550000Viet Nam Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

Improving the accuracy of flood prediction and mapping is crucial for reducing damage resulting from flood *** this study,we proposed and validated three ensemble models based on the Best First Decision Tree(BFT)and the Bagging(Bagging-BFT),Decorate(Bagging-BFT),and Random Subspace(RSS-BFT)ensemble learning techniques for an improved prediction of flood susceptibility in a spatially-explicit manner.A total number of 126 historical flood events from the Nghe An Province(Vietnam)were connected to a set of 10 flood influencing factors(slope,elevation,aspect,curvature,river density,distance from rivers,flow direction,geology,soil,and land use)for generating the training and validation *** models were validated via several performance metrics that demonstrated the capability of all three ensemble models in elucidating the underlying pattern of flood occurrences within the research area and predicting the probability of future flood *** on the Area Under the receiver operating characteristic Curve(AUC),the ensemble Decorate-BFT model that achieved an AUC value of 0.989 was identified as the superior model over the RSS-BFT(AUC=0.982)and Bagging-BFT(AUC=0.967)models.A comparison between the performance of the models and the models previously reported in the literature confirmed that our ensemble models provided a reliable estimate of flood susceptibilities and their resulting susceptibility maps are trustful for flood early warning systems as well as development of mitigation plans.

关键词： Machine learning Ensemble learners Hybrid modeling

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Influence of sintering behavior on the microstructure and electrical properties of BaTiO_(3) lead-free ceramics from hydrothermal synthesized precursor nanoparticles

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Journal of Advanced Dielectrics 2021年第2期11卷 42-51页

作者： Do Viet On Le Dai Vuong Truong van Chuong Dao Anh Quang ho.van tuyen Vo Thanh Tung Department of Physics College of Sciences Hue UniversityHue CityVietnam Faculty of Chemical and Environmental Engineering Hue Industrial College Hue CityVietnam Institute of Research and Development Duy Tan University Da Nang CityVietnam Faculty of Natural Sciences Duy Tan University Da Nang CityVietnam

BaTiO_(3) nanoparticles were synthesized by hydrothermal method using amorphous phase TiO_(2) precursor as the *** microstructure and phase structure were determined using XRD,SEM and Raman spectroscopy analysis *** results showed that BaTiO_(3) nanoparticles have tetragonal structure,average size of about 100 nm was obtained at Ba/Ti ratio of 1.5,synthesis temperature of 200℃ and reaction time of 12 *** components of the BaTiO_(3) lead-free ceramic system are fabricated by conventional solid-phase reaction from the average size BaTiO_(3) particles about 100 nm obtained by hydrothermal *** effects of sintering behavior on dielectric,ferroelectric and piezoelectric properties of BT high-density ceramic were *** BaTiO_(3) ceramic composition sintered at 1300℃ has a relative density of 97%,the value of the electromechanical coefficient kp=0.40,k33=0.42,the large piezoelectric coefficient d_(33)=300 pC/N,d_(31)=−125 pC/N.

关键词： BaTiO_(3)nanoparticles lead-free ceramics piezoelectric ferroelectric properties

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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

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Unpredictable Placental Abruption: Case Series

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Case Reports in Clinical Medicine 2020年第6期9卷 165-175页

作者： Nguyen hong hoa Nguyen Thi Mong tuyen Department of Obstetrics & Gynecology Faculty of Medicine University of Medicine and Pharmacy at Ho Chi Minh City Ho Chi Minh City Vietnam Department of Obstetrics Tu Du Hospital Ho Chi Minh City Vietnam

Background: The diagnosis of placental abruption is primarily clinical, but findings from imaging, laboratory, and postpartum pathologic studies can be used to support the clinical diagnosis. In patients with classic symptoms, fetal heart rate abnormalities, intrauterine fetal demise, and/or disseminated intravascular coagulation strongly support the clinical diagnosis and indicate extensive placental separation. In a few cases, placental separation has not been recognized and was only identified upon cesarean section as an incidental finding. Objectives: To describe the clinical presentations and pregnancy outcomes of placental abruption cases that are not diagnosed before cesarean delivery, termed “unpredictable placental abruption” and also cases diagnosed before cesarean delivery, termed “predictable placental abruption”. Methods: A retrospective analysis of 100 cases of placental abruption was identified by cesarean delivery at Tu Du hospital from September 2018 to May 2019. Clinical variables were compared between the unpredictable and predictable groups. The unpredictable group consists of cases that are not diagnosed before cesarean delivery, while the predictable cases were identified placental separation before cesarean delivery. The maternal and fetal outcomes were also studied. Results: In 100 cases of placental, abruption by gross clinical examination of the placenta at the time operation revealed that, 33% were unpredictable. Placental abruption attributed to maternal complications included one case of total hysterectomy (1%) with no cases of disseminated intravascular coagulation (DIC), shock or maternal death;specifically, this case of total hysterectomy appeared with predictable one. There were two cases of stillbirths. Among the 98 live neonates, 15 cases (14.7%) experienced severe birth asphyxia resulting in eight neonatal deaths;two of which were caused by heart disease and necrotizing enterocolitis. Sixty-thre

关键词： Placental Abruption Pregnancy Outcomes Concealed Placental Abruption Chronic Placental Abruption

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Application of Rough Set, GSM and MSM to Analyze Learning Outcome—An Example of Introduction to Education

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Journal of Intelligent Learning Systems and Applications 2016年第1期8卷 23-38页

作者： Hui-Chung ho Woody Jann-Der Fann Hsiu-Jye Chiang Phung-tuyen Nguyen Duc-Hieu Pham Phuoc-Hai Nguyen Masatake Nagai Retired National Taichung University of Education Taiwan Ling-Tung University Taiwan National United University Taiwan Kien Giang Teacher Training College Rach Gia Vietnam Hanoi Pedagogical University 2 Xuan Hoa Vietnam Retired Teikyo University Tokyo Japan

Introduction to education is one of the basic courses in teacher education professional education, it covers a wide range of subjects. Thus, in order to practice the management teaching goals, the interdisciplinary developed mathematical tools are applied for the study. The participants of this study are students in course of introduction to education, and the research instruments applied are rough set, grey structural modeling (GSM), and matrix based-structural modeling (MSM). The purposes of this paper are: 1) To logically analyze educational datasets to practice the scientific traits in education;2) To benefit from directed hierarchical analysis to identify and propose action planning;3) To construct core-oriented educational structure as the criterion-reference for one-lesson-multiple-design and to provide the whole scope and visualized analysis with GSM and MSM.

关键词： Introduction to Education Rough Set GSM MSM One-Lesson-Multiple-Design

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Determination of the Administration Routes,Doses and Appropriate Age to Vaccinate With Ornitin Triple Vaccine For Cross-breed Colored Broilers in Vietnam

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Veterinary Science Research 2019年第2期1卷 1-9页

作者： Nguyen Manh ho Bui Ngoc Xuan Ha Le Thi Kim tuyen Le Thi Anh Thu Le Thanh Hien Quach Tuyet Anh Faculty of Animal Science and Veterinary Medicine Nong Lam UniversityHo Chi Minh CityVietnam

The study was to determine the appropriate dose and administration route of Ornitin Triple vaccine in cross-breed coloured broilers in Vietnam by evaluating the antibody titer against Ornithobacterium rhinotracheale(ORT)and local reactions at injection sites on chickens after *** study was divided into 2 *** trials were designed with 3 vaccine dose groups:0.0ml(control group),0.25ml and 0.5ml and 2 different administration routes:subcutaneous at neck(SC)and intramuscular at breast(IM)*** result showed that,no statistically significant difference was found between antibody titer of two administration routes as well as 2 vaccine doses until *** reactions at the injection sites of IM route was less severe than SC at neck and in higher dose would produce a more severe swelling *** weight gain was found to have a slight decrease in the vaccinated groups within 2 weeks after vaccination,however,no statistically significant difference was found in later stage(P>0.05).In conclusion,Ornitin Triple can be used to vaccinate by IM with the dose of 0.25ml for coloured broilers at early age(3-week-old),or 0.5ml for older birds and should be careful for some reactions at the injection sites.

关键词： ORT disease swelling reaction titer IDEXX bacteria vaccine

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Phytochemical Constituents and Determination of Resveratrol from the Roots of <i>Arachis hypogea</i>L.

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American Journal of Plant Sciences 2013年第12期4卷 2351-2358页

作者： tuyen Pham Nguyen Kim Nga Vo Thi Phuong Tran van Phuong Quach Ngo Diem Duong Ngo Thi Thuy Quang Ton That Phung Nguyen Kim Phi Department of Chemical Technology Faculty of Chemical-Food Technology University of Technical Education Ho Chi Minh City Ho Chi Minh City Vietnam Department of Organic Chemistry Faculty of Chemistry University of Science Vietnam National University-Ho Chi Minh City Ho Chi Minh City Vietnam Department of Plant Biotech and Biotransformation Faculty of Biology University of Science Vietnam National University-Ho Chi Minh City Ho Chi Minh City Vietnam Faculty of Environmental Science Sai Gon University Ho Chi Minh City Vietnam

Two triterpenoid saponins, 6, 7, together with five known compounds were isolated from the roots of Arachis hypogea L. collected in Vietnam. Their structures were established by spectroscopic analysis (1D, 2D NMR and HRMS) as well as by comparison with those reported in the literature. Furthermore, the high content of resveratrol in the roots opens a new potential resource for pharmaceutical companies to prepare medicines from the wasted peanut roots.

关键词： Arachis hypogea L. Peanut Resveratrol Triterpenoid Glycoside

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A study implementing real-time PCR to identify Strongyloides species of third-stage larvae in human stool samples from Southern Vietnam

Infectious Medicine

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Infectious Medicine 2023年第3期2卷 229-236页

作者： Le Duc Vinh Nguyen Kim Thach Huynh hong Quang Do Nhu Binh Tran Thi Duc Hanh Nguyen Minh Toàn Nguyen Trung tuyen Nguyen Thu Huong Department of Medical Parasitology Pham Ngoc Thach University of MedicineHo Chi Minh City 700000Vietnam Department of Fundamental Chemistry-Biochemistry Pham Ngoc Thach University of MedicineHo Chi Minh City 700000Vietnam Clinical Epidemiology Research Unit Institute of MalariologyParasitologyand Entomology Quy NhonBinh Dinh 55000Vietnam Department of Infectious Disease Military Hospital 103Hanoi 100000Vietnam Department of Epidemiology Hanoi University of Public HealthHanoi 100000Vietnam Department of Microbiology-Parasitology Hanoi University of Public HealthHanoi 100000Vietnam Department of Medicine University of Medicine and PharmacyVietnam National UniversityHanoi100000 Vietnam

Background:Strongyloidiasis,a neglected disease caused by intestinal nematodes of the genus,is endemic to tropical and subtropical areas such as *** methods only identify the genus,while DNA-molecular techniques are susceptible in Strongyloides *** study aims to determine the prevalence of dominant Strongyloides species among the population in Duc hoa district,Long An,***:A cross-sectional study used 1190 stool specimens collected from July 2017 to November *** samples were transported within 2 h,stored at 2-8℃,and processed within 48 h for microscopy smear and culture at the Laboratory of Medical Parasitology,Pham Ngoc Thach University of Medicine(PNT).Then all positive samples with the above 2 methods were verified by real-time PCR ***-time PCR amplification was conducted at the Laboratory of Molecular Biology,***:Direct microscopy and modified Harada-Mori culture detected Strongyloides *** in 79/1190 sam-ples(6.6%).About 94.2%of the DNA samples were Strongyloides stercoralis,2.9%were co-infections with Strongy-loides ratti and ***,and 2.9%were patients with *** identity of 12/14 sequences was confirmed as *** with a high level of similarity(91.3%-100%)and over 98%for ***:DNA-molecular techniques and sequence analysis are highly suitable for identifying Strongyloides species isolated from stool *** is remarkable evidence of the presence of zoonosis *** disease in human,not just the known *** is likely to result in a certain proportion of people being infected by this animal-borne infectious pathogen.

关键词： Strongyloidiasis Strongyloides stercoralis Strongyloides ratti DNA-molecular techniques

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Effect of Freeze-Thaw and Urea in Solubility of GPC3-Csub Protein Expressed in Escherichia coli

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Journal of Biosciences and Medicines 2024年第4期12卷 288-297页

作者： Xuan-Truc Chu-Dao Kim-tuyen Huynh-Dam Dang-Thuc Ngo-Luong Quang-Luan Le Thanh-Thao Vo-Nguyen Department of Medical Biotechnology Biotechnology Center of Ho Chi Minh City Ho Chi Minh City Vietnam

Glypican-3 is a protein encoded by the Glypican-3 gene located on human X chromosome (Xq26), composed of two subunits, a 40 kDa N-terminal subunit, and a 30 kDa C-terminal subunit. Glypican-3 is a currently potential target molecule for liver cancer treatments because of its over-expression and growth effects on hepatocellular carcinoma (HCC). This study examined the expression and purification of a C-terminal subunit of Glypican-3 protein (GPC3-Csub) due to its application in both diagnosis and therapy for hepatocellular carcinoma. The gene encoding for GPC3-Csub was successfully cloned into plasmid pET28a fused with an affinity tag composed of six consecutive histidine residues (His-tag). Recombinant protein GPC3-Csub was expressed in Escherichia coli BL21 (DE3) in the condition of adding 3% ethanol with IPTG induction. GPC3-Csub was extracted using repeated freeze-thaw cycles with lysozyme, and inclusion bodies were solubilized by 8M Urea, SDS 10% in pH 12. His-tag fused GPC3-Csub proteins allowed it to be purified by affinity chromatography method using the Nickel-nitrilotriacetic acid (Ni-NTA) column. High expression of GPC3-Csub was confirmed by Coomassie staining and western-blot. GPC3-Csub could be isolated with a Ni-NTA column and have a purity of about 90%.

关键词： Glypican-3 Affinity Chromatography Inclusion Body Liver Cancer

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