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Effect of heating time on structural,morphology,optical,and photocatalytic properties of g-C3N4 nanosheets

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Chinese Physics B 2020年第5期29卷 504-508页

作者： Nguyen Manh Hung Le Thi Mai Oanh Lam Thi Hang Pham Do Chung Pham Thi Duyen Dao Viet thang Nguyen van Minh Center for Nano Science and Technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi100000Vietnam Department of Physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41A Phu Dien RoadNorth Tu LiemHanoi100000Vietnam Hanoi University of Mining and Geology Duc Thang wardNorth Tu Liem DistrictHanoi100000Vietnam Military science Academy 322 Le Trong Tan streetDinh CongHoang MaiHanoi100000Vietnam

Effect of heating time on the structural,morphology,optical,and photocatalytic properties of graphitic carbon nitride(g-C3N4)nanosheets prepared at 550℃in Ar atmosphere is *** investigations are carried out by using x-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),UV-vis absorption,and photoluminescence(PL).At a heating temperature of 550℃,g-C3N4 nanocrystals are formed after 0.5 h and become more orderly as the heating time *** surface area of the g-C3N4 nanosheets significantly increases as the preparation time *** g-C3N4 prepared in 2.5 h shows the highest photocatalytic performance,decomposing completely 10 ppm RhB solution under xenon lamp irradiation for 2.0 h.

关键词： nanosheets photocatalytic heating time Ar atmosphere

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

Enhancing global hepatocellular carcinoma management:Bridging Eastern and Western perspectives on dexamethasone and Nacetylcysteine before transarterial chemoembolization

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World Journal of Gastroenterology 2024年第47期30卷 4983-4990页

作者： thang Viet Luong Nam van Duc Nguyen Linh Duy Le Hieu Nguyen Hoang Minh Hai Nguyen Ngoc Dang Department of Internal Medicine University of Medicine and PharmacyHue UniversityHue 530000Viet Nam Department of Diagnostic Imaging University of Medicine and PharmacyHue UniversityHue 530000Viet Nam Faculty of Medicine Duy Tan UniversityDa Nang 550000Viet Nam

This article explores the integration of Eastern and Western perspectives on the use of dexamethasone and N-acetylcysteine as premedications in transarterial chemoembolization for hepatocellular carcinoma(HCC).By examining key concerns raised by Western researchers,particularly regarding the different etiologies of liver cirrhosis,and contrasting them with robust clinical data from Asia,this article highlights the necessity for region-specific research and proposes future directions for global HCC management.

关键词： Hepatocellular carcinoma Transarterial chemoembolization Dexamethasone N-acetylcysteine East-West perspectives Post-embolization syndrome

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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城乡空间差异对麻栎林土壤活性有机碳的影响

南京林业大学学报（自然科学版） 2020年第4期44卷 151-158页

作者：范洪旺 BUI van thang 陶晓管致玮许克福安徽农业大学林学与园林学院安徽合肥230036 越南林业大学第二分校林学系同奈省81000 安徽农业大学轻纺工程与艺术学院安徽合肥230036

【目的】了解城乡空间差异下森林土壤活性有机碳的动态变化和影响因素,为城市森林生态系统的碳循环研究提供数据支撑。【方法】以合肥市城乡空间差异3个森林公园为研究对象,研究城乡麻栎林0~10 cm和≥10~20 cm土层内土壤活性有机碳含量... 详细信息

【目的】了解城乡空间差异下森林土壤活性有机碳的动态变化和影响因素,为城市森林生态系统的碳循环研究提供数据支撑。【方法】以合肥市城乡空间差异3个森林公园为研究对象,研究城乡麻栎林0~10 cm和≥10~20 cm土层内土壤活性有机碳含量,探讨城乡空间差异对森林土壤有机碳的影响。【结果】城乡空间差异条件下,麻栎林土壤微生物量碳(MBC)和可溶性有机碳(DOC)含量差异显著(P乡村(99.94 mg/kg)>城郊(96.42 mg/kg),不同城乡空间森林表层土壤MBC和DOC含量比≥10~20 cm土层的高。森林土壤MBC具有明显的季节变化,最高值出现在秋季(10月),而土壤DOC未发现显著季节变化。相关分析表明,土壤MBC和DOC与土壤总有机碳(TOC)、全氮(TN)呈极显著相关(P<0.001),土壤DOC与pH呈极显著负相关。【结论】不同城乡空间环境因子与土壤养分共同作用导致了土壤活性有机碳时空格局的差异。

关键词：城乡空间微生物量碳(MBC) 可溶性有机碳(DOC) 麻栎林

The Role of <sup>18</sup>F-FDG PET/CT in Staging Breast Carcinoma in Hanoi Oncology Hospital, Vietnam

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Journal of Biosciences and Medicines 2022年第1期10卷 190-201页

作者： Cuong Duy Dang thang van Nguyen Tuynh van Chu Huy Quang Pham Nuclear Medicine Department Hanoi Oncology Hospital Hanoi Vietnam Breast and Gynecologic Surgery Department Hanoi Oncology Hospital Hanoi Vietnam

Purpose: This study aimed to evaluate the role of 18F-FDG PET/CT scans in staging breast carcinoma. Materials and Methods: A descriptive study on 46 patients who were diagnosed with breast carcinoma in Hanoi Oncology Hospital, Vietnam from June 2019 to June 2021. Those patients underwent 18F-FDG PET/CT scans for pre-treatment staging. Results: There was a positive correlation between the size of primary tumors and their SUV (p 18F-FDG PET/CT were 75% and 100%, respectively. The rate of distant metastasis detection was 15.2% (7/46 patients). Metastatic lesions were found in bone, lungs, liver, and lymph nodes. There was a significant difference in SUV among organs (p 18F-FDG PET/CT. After PET/CT, 17.4% patients (8/46) had their treatment plan changed. Conclusions: 18F-FDG PET/CT plays an important role in staging breast carcinoma. Determining accurately the breast carcinoma stage by 18F-FDG PET/CT could help alter treatment strategy to best suit with patients, and avoid unnecessary surgery.

关键词： 18F-FDG PET/CT (Positron Emission Tomography with 2-Deoxy-2-[Fluorine-18]Fluoro-D-Glucose Integrated with Computed Tomography) Breast Carcinoma Staging SUV (Standardized Uptake Value)

Applied theory of bending vibration of the piezoelectric and piezomagnetic bimorph

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Journal of Advanced Dielectrics 2020年第3期10卷 72-76页

作者： Do Thanh Binh V.A.Chebanenko Le van Duong E.Kirillova Pham Manh thang A.N.Soloviev Department of Theoretical and Applied Mechanics Don State Technical University No.1 Gagarin sq.Rostov-on-Don 344000Russia Southern Scientific Center of RAS No.41 Chekhov AvenueRostov-on-Don 344006Russia Department of Construction Machinery Le Quy Don Technical University No.236 Hoang Quoc Viet str.Hanoi 100000Vietnam RheinMain University of Applied Sciences Kurt-Schumacher-Ring 18 Wiesbaden 65197Germany Department of Engineering Mechanics and Automation Vietnam National University No.144 Xuan Thuy str.Hanoi 100000Vietnam Institute of Mathematics Mechanics and Computer Sciences Southern Federal UniversityNo.8AMilchakova St.Rostov-on-Don 344090Russia

Based on the variational principle,equations and boundary conditions for transverse steady vibrations of a bimorph consisting of a piezoelectric and piezomagnetic layers are *** results of calculations of natural freq... 详细信息

关键词： Energy harvesting piezoelectrics piezomagnetics applied theory

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

Propagation Path Loss Models at 28 GHz Using K-Nearest Neighbor Algorithm

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通讯和计算机（中英文版） 2022年第1期19卷 1-8页

作者： vu Thanh Quang Dinh van Linh To Thi Thao Hanoi University of Science and Technology No.1 Dai Co Viet roadHanoiVietnam Academy of Cryptography Techniques 141 Chien Thang RoadHanoiVietnam Post and Telecommunications Institute HanoiVietnamKm 10Nguyen Trai RoadHanoiVietnam

In this paper,we develop and apply K-Nearest Neighbor algorithm to propagation pathloss *** path loss models present the dependency of attenuation value on distance using machine learning algorithms based on the experimental *** algorithm is performed by choosing k nearest points and training dataset to find the optimal k *** proposed method is applied to impove and adjust pathloss model at 28 GHz in Keangnam area,Hanoi,*** experiments in both line-of-sight and non-line-of-sight scenarios used many combinations of transmit and receive antennas at different transmit antenna heights and random locations of receive antenna have been carried out using Wireless Insite *** results have been compared with 3GPP and NYU Wireless Path Loss Models in order to verify the performance of the proposed approach.

关键词： K-nearest neighbor regression 5G millimeter waves path loss