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Static analysis of corrugated panels using homogenization models and a cell-based smoothed mindlin plate element (CS-MIN3)

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Frontiers of Structural and Civil Engineering 2019年第2期13卷 251-272页

作者： Nhan NGUYEN-MINH Nha TRAN-VAN thang bui-xuan Trung NGUYEN-THOI Faculty of Applied Science Bach Khoa University (BKU)Ho Chi Minh CityVietnam Faculty of Mathematics and Computer Science Ho Chi Minh City University of Science (HCMUS)Ho Chi Minh CityVietnam Department of Mathematics L ouisiana State UniversityBaton RougeLA 70803USA Division of Computational Mathematics and Engineering Institute of Computational ScienceTon Due Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Due Thang UniversityHo Chi Minh CityVietnam

Homogenization is a promising approach to capture the behavior of complex structures like corrugated panels. It enables us to replace high-cost shell models with stiffness-equivalent orthotropic plate alternatives. Many homogenization models for corrugated panels of different shapes have been proposed. However, there is a lack of investigations for verifying their accuracy and reliability. In addition, in the recent trend of development of smoothed finite element methods, the cell-based smoothed three-node Mindlin plate element (CS-MIN3) based on the first-order shear deformation theory (FSDT) has been proposed and successfully applied to many analyses of plate and shell structures. Thus, this paper further extends the CS-MIN3 by integrating itself with homogenization models to give homogenization methods. In these methods, the equivalent extensional, bending, and transverse shear stiftriess components which constitute the equivalent orthotropic plate models are represented in explicit analytical expressions. Using the results of ANSYS and ABAQUS shell simulations as references, some numerical examples are conducted to verify the accuracy and reliability of the homogenization methods for static analyses of trapezoidally and sinusoidally corrugated panels.

关键词： homogenization corrugated panel asymptotic analysis smoothed finite element method (S-FEM) cell-based smoothed three-node Mindlin plate element (CS-MIN3)

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Genetic diversity in two threatened species in Vietnam:Taxus chinensis and Taxus wallichiana

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Journal of Forestry Research 2017年第2期28卷 265-272页

作者： Dinh Duy Vu Thi Tuyet xuan bui Minh Tam Nguyen Dinh Giap Vu Minh Duc Nguyen Van thang bui Xiaohua Huang Yi Zhang College of Forestry Northwest A&F UniversityYangling 712100ShaanxiPeople's Republic of China Vietnam National Museum of Nature Vietnam Academy of Science and Technology(VAST)18 Hoang Quoc VietCau GiayHanoiVietnam Institute of Ecology and Biological Resource(VAST) 18 Hoang Quoc VietCau GiayHanoiVietnam Institute of Natural Products Chemistry(VAST) 18 Hoang Quoc VietCau GiayHanoiVietnam Institute of Forest Biotechnology Vietnam Forestry UniversityXuan MaiChuong MyHanoiVietnam

Taxus chinensis and T. wallichiana in have been threatened in their distribution areas in recent decades because of their over-exploitation and reduction and destruction of native habitats. Determining the genetic diversity in populations of the two species will provide guidelines for their protection and preservation. Two hundred and fifteen trees from six populations of T. chinensis and150 sampled trees of T. wallichiana were sampled. Six microsatellite primer pairs selected from 16 primer pairs were used to investigate genetic variation at the population and species levels. Five yielded polymorphic alleles, and among the 13 putative alleles amplified, 11 were polymorphic（accounting for 76.33 %）.Shannon＇s information index（I） and percentage of polymorphic bands（PPB）（I = 0.202 and PPB = 67.22 % for T. chinensis; I = 0.217 and PPB = 65.03 % for T. wallichiana）. Both species had low levels of genetic diversity（mean Ho= 0.107, He= 0.121 for T. chinensis; Ho= 0.095, He= 0.109 for T. wallichiana）. Genetic differentiation among populations was higher（FST= 0.189） for T. chinensis and lower（0.156） for ***, indicating limited gene flow（Nm） among populations for T. chinensis（0.68） and T. wallichiana（0.65）.Variation among individuals of T. chinensis was 63.59 and73.12 % for T. wallichiana. Thus, the threatened status of the two conifers is related to a lack of genetic diversity. All populations are isolated in small forest remnants. An ex situ conservation site should be established with a new population for these species that comprises all the genetic groups for the best chance to improve their fitness under environmental stresses.

关键词： Taxus populations alleles polymorphic microsatellite Vietnam primer accounting putative destruction

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Predicting rock size distribution in mine blasting using various novel soft computing models based on meta-heuristics and machine learning algorithms

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Geoscience Frontiers 2021年第3期12卷 458-472页

作者： Chengyu Xie Hoang Nguyen xuan-Nam bui Yosoon Choi Jian Zhou Thao Nguyen-Trang School of Environment and Resources Xiangtan UniversityXiangtan 411105China Institute of Research and Development Duy Tan UniversityDa Nang 550000Viet Nam Department of Surface Mining Mining FacultyHanoi University of Mining and Geology18 Pho VienDuc Thang wardBac Tu Liem districtHanoi 100000Viet Nam Center for Mining Electro-Mechanical researchHanoi University of Mining and Geology18 Pho VienDuc Thang wardBac Tu Liem districtHanoi 100000Viet Nam Department of Energy Resources Engineering Pukyong National UniversityBusan 48513Republic of Korea School of Resources and Safety Engineering Central South UniversityChangsha 410083HunanChina Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh City 700000Viet Nam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh City 700000Viet Nam

Blasting is well-known as an effective method for fragmenting or moving rock in open-pit *** evaluate the quality of blasting,the size of rock distribution is used as a critical criterion in blasting operations.A high percentage of oversized rocks generated by blasting operations can lead to economic and environmental ***,this study proposed four novel intelligent models to predict the size of rock distribution in mine blasting in order to optimize blasting parameters,as well as the efficiency of blasting operation in open ***,a nature-inspired algorithm(i.e.,firefly algorithm-FFA)and different machine learning algorithms(i.e.,gradient boosting machine(GBM),support vector machine(SVM),Gaussian process(GP),and artificial neural network(ANN))were combined for this aim,abbreviated as FFA-GBM,FFA-SVM,FFA-GP,and FFA-ANN,***,predicted results from the abovementioned models were compared with each other using three statistical indicators(e.g.,mean absolute error,root-mean-squared error,and correlation coefficient)and color intensity *** developing and simulating the size of rock in blasting operations,136 blasting events with their images were collected and analyzed by the Split-Desktop *** which,111 events were randomly selected for the development and optimization of the ***,the remaining 25 blasting events were applied to confirm the accuracy of the proposed ***,blast design parameters were regarded as input variables to predict the size of rock in blasting ***,the obtained results revealed that the FFA is a robust optimization algorithm for estimating rock fragmentation in bench *** the models developed in this study,FFA-GBM provided the highest accuracy in predicting the size of fragmented *** other techniques(i.e.,FFA-SVM,FFA-GP,and FFA-ANN)yielded lower computational stability and ***,the FFA-GBM model can be used as a powerful

关键词： Mine blasting Rock fragmentation Artificial intelligence Hybrid model Gradient boosting machine Meta-heuristic algorithm

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Hydrodynamics and heat transfer of gas-solid two-phase mixtures flowing through packed beds——a review

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Progress in Natural Science:Materials International 2008年第10期18卷 1185-1196页

作者： Ngoc thang Cong Institute of Particle Science & Engineering University of LeedsClarendon RoadLeeds LS2 9JTUK

Flow of a gas-solid two-phase mixture through a packed bed is relevant to a number of industrial processes such as heat recovery and filtration of dusty flue gases,iron making in shaft reactors,gas purification,and sorption enhanced reaction *** spite of the industrial relevance,little work has been reported in the *** limited amount of research work has mainly addressed the mac- roscopic hydrodynamics in terms of pressure drop and solids hold-ups at the ambient *** little is done,until fairly recent, on solids motion at the single particle level,hydrodynamics at elevated temperatures and heat *** paper reviews the recent development in the field including both the hydrodynamics and heat transfer of gas-solid two-phase mixtures flowing through packed beds,which is believed to represent the state-of-the-art in the *** review is not aimed to be exhaustive but rather focused on our own work carried out over the past few years in the Institute of Particle Science & Engineering at the University of *** some of our results are compared with that of other groups.

关键词： Gas-solid two-phase flow Hydrodynamics Heat transfer PEPT Euler-Euler multi-fluid model

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Progress in electrical energy storage system:A critical review

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Progress in Natural Science:Materials International 2009年第3期19卷 291-312页

作者： thang Ngoc Cong Institute of Particle Science and Engineering University of Leeds

Electrical energy storage technologies for stationary applications are reviewed. Particular attention is paid to pumped hydroelectric storage, compressed air energy storage, battery, flow battery, fuel cell, solar fuel, superconducting magnetic energy storage, flywheel, capacitor/supercapacitor, and thermal energy storage. Comparison is made among these technologies in terms of technical characteris- tics, applications and deployment status.

关键词： Progress Electrical energy storage

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Understanding gastric metastasis of small cell lung carcinoma:Insights from case reports and clinical implications

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World Journal of Gastroenterology 2024年第47期30卷 5092-5096页

作者： Nhi Thi Y Nguyen thang Viet Luong Dat xuan Nguyen Linh Duy Le Hai Nguyen Ngoc Dang Department of Internal Medicine University of Medicine and PharmacyHue UniversityHue 530000Viet Nam Faculty of Medicine Duy Tan UniversityDa Nang 550000Viet Nam

Small cell lung cancer(SCLC)is a common type of primary lung cancer that contributes to approximately 15%of *** is closely associated with tobacco risk *** is also known as a type of lung cancer that has a high mortality rate within a short time due to its rapid growth rate(with tumor doubling time of 30 days)and its tendency to metastasize early in the disease *** primary sites of metastasis in SCLC are similar to those in other primary lung cancers and often include the brain,bones,adrenal glands,liver,and lymph ***,there are a few clinical reports of uncommon metastases,such as gastric metastasis from *** the incidence of this clinical presentation is very low,reported cases have generally resulted in early mortality due to inadequate *** purpose of this letter is to discuss the knowledge related to gastric metastasis from SCLC and remind clinical doctors not to miss atypical symptoms,thereby providing the right attitude to improve the prognosis for these patients.

关键词： Gastric metastasis Small cell lung cancer Primary lung cancer Immunohistochemistry Clinical cases

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Adaptive-backstepping force/motion control for mobile-manipulator robot based on fuzzy CMAC neural networks

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Control Theory and Technology 2014年第4期12卷 368-382页

作者： thang-Long MAI Yaonan WANG College of Electrical and Information Engineering Hunan University Faculty of Electronics Engineering Industrial University of Hochiminh City

In this paper, an adaptive backstepping fuzzy cerebellar-model-articulation-control neural-networks control （ABFCNC） system for motion/force control of the mobile-manipulator robot （MMR） is proposed. By applying the ABFCNC in the tracking-position controller, the unknown dynamics and parameter variation problems of the MMR control system are relaxed. In addition, an adaptive robust compensator is proposed to eliminate uncertainties that consist of approximation errors, uncertain disturbances. Based on the tracking position-ABFCNC design, an adaptive robust control strategy is also developed for the nonholonomicconstraint force of the MMR. The design of adaptive-online learning algorithms is obtained by using the Lyapunov stability theorem. Therefore, the proposed method proves that it not only can guarantee the stability and robustness but also the tracking performances of the MMR control system. The effectiveness and robustness of the proposed control system are verified by comparative simulation results.

关键词： Backstepping control Fuzzy CMAC (cerebellar model articulation controller) neural networks Adaptive robustcontrol Mobile-manipulator robot

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K-Ar Dating of Fault Gouges from the Red River Fault Zone of Vietnam

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1653-1663页

作者： bui Hoang Bac NGO xuan Thanh Yungoo SONG Tetsumaru ITAYA Koshi YAGI KHUONG The Hung NGUYEN Tien Dung Faculty of Geosciences and Geoengineering Hanoi University of Mining and Geology Duc Thang Bac Tu Liem Hanoi Vietnam Department of Earth System Sciences Yonsei University 50 Yonsei-ro Seoul 120-749 Republic of Korea Japan Geochronology Network (NPO) 2-5 Nakashima Naka-ku Okayama 703-8252 Japan Hiruzen Institute for Geology and Chronology Co. Ltd. 2-5 Nakashima Nakaku Okayama 703-8252 Japan

Constraining the timing of fault zone formation is fundamentally important in terms of geotectonics to understand structural evolution and brittle fault *** paper presents the first authigenic illite K-Ar age data from fault gouge samples collected from the Red River Shear Zone at Lao Cai province,*** fault gouge samples were separated into three grain-size fractions（〈0.1 μm,0.1-0.4 μm and 0.4-1.0 μm）.The results show that the K-Ar age values decrease from coarser to finer grain fractions（24.1 to 19.2 Ma）,suggesting enrichment in finer fraction of morerecently grown authigenic *** timing of the fault movement are the lower intercept ages at 0%detrital illite（19.2 ± 0.92 Ma and 19.4 ± 0.49 Ma）.In combination with previous geochronological data,this result indicates that the metamorphism of the Day Nui Con Voi（DNCV） metamorphic complex took place before ca.26.8 *** about 26.8 Ma-25 Ma,the fault strongly acted to cause the rapid exhumation of the rocks along the Red River-Ailoa Shan Fault Zone（RR-ASFZ）.During brittle deformation,the DNCV slowly uplifted,implying weak movement of the *** brittle deformation might have lasted for ca.5 Ma.

关键词： illite K-Ar dating Red River Fault Zone polytype gouge authigenitic

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城乡空间差异对麻栎林土壤活性有机碳的影响

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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

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Development of an automatic and knowledge-infused framework for structural health monitoring based on prompt engineering

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Frontiers of Structural and Civil Engineering 2024年第11期18卷 1752-1774页

作者： Truong-thang NGUYEN Viet-Hung DANG Thanh-Tung PHAM Faculty of building and Industrial Construction Hanoi University of Civil EngineeringHanoi 11600Vietnam Research Group of Development and application of advanced materials and modern technologies in construction Hanoi University of Civil EngineeringHanoi 11600Vietnam

Collecting and analyzing vibration signals from structures under time-varying excitations is a non-destructive structural health monitoring approach that can provide meaningful information about the structures’safety without interrupting their normal *** paper develops a novel framework using prompt engineering for seamlessly integrating users’domain knowledge about vibration signals with the advanced inference ability of well-trained large language models(LLMs)to accurately identify the actual states of *** proposed framework involves formulating collected data into a standardized form,utilizing various prompts to gain useful insights into the dynamic characteristics of vibration signals,and implementing an in-house program with the help of LLMs to perform damage *** advantages,as well as limitations,of the proposed method are qualitatively and quantitatively assessed through two realistic case studies from literature,demonstrating that the present method is a new way to quickly construct practical and reliable structural health monitoring applications without requiring advanced programming/mathematical skills or obscure specialized programs.

关键词： structural health monitoring vibration large language model signal processing prompt engineering

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