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Behavior of noncircular tunnels excavated in stratified rock masses-Case of underground coal mines

Journal of Rock Mechanics and Geotechnical Engineering 2019年第1期11卷 99-110页

作者： Ngoc Anh Do Daniel Dias Van Diep Dinh Tien Tung Tran Van Canh Dao Viet Doan Dao phuc nhan nguyen Department of Underground and Mining Construction.Faculty of Civil Engineering Hanoi University of Mining and Ceology School of Automotive and Transportation Engineering Hefei University of Technology Laboratory 35R Crenoble Alpes University

The amount of tunnels excavated along stratified/sedimentary rock masses in Quangninh coal mine area,Vietnam, is gradually increasing. Rock mass in Quangninh is characterized by beddings between rock layers. The behavior of stratified rock masses surrounding the tunnels depends on both the intact rock and the beddings between rock layers. The main characteristics of stratified rock masses that need to be considered are their heterogeneity and anisotropy. Depending on the dip angle of rock layers, movements and failure zones developed surrounding the tunnels can be asymmetrical over the vertical axis of tunnel. This asymmetry causes adverse behaviors of the tunnel structures. The objective of this study is to highlight convergences and yielded zones developed in rock masses surrounding noncircular tunnels in Quangninh coal mine area using a finite element method. The presence of bedding joints is explicitly simulated. The numerical results indicated that with the increase in dip angle of bedding joints, the stress asymmetry over the tunnel vertical axis increases. It gradually leads to an asymmetry of the failure zone surrounding the tunnel. An increase of rock mass quality means a decrease of rock mass sensitivity to the discontinuities. In addition,a dip angle of the bedding joints of approximately 45° could be considered as the critical angle at which the rock mass mechanism changes between sliding and bending.

关键词： Tunnel Bedding Stratification Anisotropic Heterogeneity

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Stochastic Programming For Order Allocation And Production Planning

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Computer Systems Science & Engineering 2022年第1期40卷 75-85页

作者： Phan nguyen Ky phuc International University-Vietnam National University Vietnam National UniversityHoChiMinh City70000Vietnam

Stochastic demand is an important factor that heavily affects production *** influences activities such as purchasing,manufacturing,and selling,and quick adaption is *** production planning,for reasons such as reducing costs and obtaining supplier discounts,many decisions must be made in the initial stage when demand has not been *** effects of non-optimal decisions will propagate to later stages,which can lead to losses due to overstocks or *** find the optimal solutions for the initial and later stage regarding demand realization,this study proposes a stochastic two-stage linear program-ming model for a multi-supplier,multi-material,and multi-product purchasing and production planning *** objective function is the expected total cost after two stages,and the results include detailed plans for purchasing and production in each demand ***-scale problems are solved through a deterministic equivalent transformation *** solve the problems in the large scale,an algorithm combining metaheuristic and sample average approximation is *** algorithm can be implemented in parallel to utilize the power of the *** algorithm based on the observation that if the remaining quantity of materials and number of units of products at the end of the initial stage are given,then the problems of the first and second stages can be decomposed.

关键词： Mixed integer programming two-stage stochastic programming production planning order allocation

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Electronic Band Structure of Carbon Nanotubes with Kekule Structure

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Chinese Physics Letters 2013年第9期30卷 97-100页

作者： nguyen Ngoc Hieu Le Cong nhan Center of Research and Development Duy Tan UniversityK7/25 Quang TrungDa NangViet Nam Department of Environmental Science Saigon University273 An Duong VuongHo Chi Minh cityViet Nam

Electronic band structure of carbon nanotubes with the Kekule structure is studied by the tight-binding *** give a complete geometrical approach to structural properties of carbon nanotubes with bond alternation,including chiral and achiral *** the Kekule is introduced,all carbon nanotubes become semiconducting with a small band gap at the Fermi *** band gap of the carbon nanotubes depends only on the difference between C–C bond lengths or the resonance integrals.

关键词： carbon structure Fermi

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ON BOUNDEDNESS PROPERTY OF SINGULAR INTEGRAL OPERATORS ASSOCIATED TO A SCHRODINGER OPERATOR IN A GENERALIZED MORREY SPACE AND APPLICATIONS

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Acta Mathematica Scientia 2020年第5期40卷 1171-1184页

作者： Xuan Truong LE Thanh nhan nguyen Ngoc Trong nguyen Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Due Thang UniversityHo Chi Minh CityVietnam Faculty of Mathematics and Statistics Ton Due Thang UniversityHo Chi Minh CityVietnam Department of Mathematics Ho Chi Minh City University of EducationHo Chi Minh CityVietnam Department of Primary Education Ho Chi Minh City University of EducationHo Chi Minh CityVietnam

In this paper,we provide the boundedness property of the Riesz transforms associated to the Schrodinger operator■=-Δ+V in a new weighted Morrey space which is the generalized version of many previous Morrey type *** additional potential V considered in this paper is a non-negative function satisfying the suitable reverse Holder's *** results are new and general in many cases of *** an application of the boundedness property of these singular integral operators,we obtain some regularity results of solutions to Schrodinger equations in the new Morrey space.

关键词： weighted Morrey spaces Schodinger operator riesz transforms Regularity estima tes

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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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Safeguarding transcriptional memory: a mitotic bookmarking role for chromatin remodelers

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Signal Transduction and Targeted Therapy 2023年第11期8卷 5132-5133页

作者： Godwin Sokpor Huu phuc nguyen Tran Tuoc Department of Human Genetics Ruhr University of BochumBochumGermany Lincoln Medical School University of LincolnLincolnUK

A recent study published in Nature reveals an interaction between SWI/SNF subunits and mitotic chromatin,which is essential for establishing gene bookmarks and preserving cell identity.1 The findings deepen our understanding of how SWI/SNF complexes regulate transcriptional memory heritability for cell fate commitment(Fig.1),thus validating the indispensability of SWI/SNF complexes in development and association of their perturbance with tumorigenesis and neurodevelopment disorders.

关键词： establishing complexes preserving

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A Truck Scheduling Problem for Multi-Crossdocking System with Metaheuristics

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Computers, Materials & Continua 2022年第9期72卷 5165-5178页

作者： Phan nguyen Ky phuc nguyen Van Thanh Duong Bao Tram International University-Vietnam National University Vietnam National UniversityHoChiMinh City70000Vietnam Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

The cross-docking is a very important subject in logistics and supply chain *** to the definition,cross-docking is a process dealing with transhipping inventory,in which goods and products are unloaded from an inbound truck and process through a flow-center to be directly loaded onto an outbound ***-docking is favored due to its advantages in reducing the material handing cost,the needs to store the product in warehouse,as well decreasing the labor cost by eliminating packaging,storing,pick-location and order *** cross-docking,products can be consolidated and transported as a full load,reducing overall distribution *** this paper,we focus on a truck scheduling at the multidoor,multi-crossdocking network with inventory constraints and process capability *** this model,a truck can visit severals docks for loading or unloading many types *** situation is very common in *** study also developed an exact mathematical model using mixedinteger linear programming(MILP)with the objective of minimizing the makespan to obtaint the benchmark in small scale *** scale problems are solved through Simulated Annealing(SA)algorithm and Tabu Search(TS)*** of these algorithms will be compared to benchmarks obtained from solver as well as to each other.

关键词： Truck scheduling multi-door multi-crossdocking network simulated annealing tabu search

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GLOBAL BOUND ON THE GRADIENT OF SOLUTIONS TO p-LAPLACE TYPE EQUATIONS WITH MIXED DATA

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Acta Mathematica Scientia 2024年第4期44卷 1394-1414页

作者： Minh-Phuong TRAN The-Quang TRAN Thanh-nhan nguyen Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam nguyen Huu Huan High School Thu Duc CityVietnam Group of Analysis and Applied Mathematics Department of MathematicsHo Chi Minh City University of EducationVietnam

In this paper,the study of gradient regularity for solutions of a class of elliptic problems of p-Laplace type is *** particular,we prove a global result concerning Lorentz-Morrey regularity of the non-homogeneous boundary data problem:-div((s^(2)+|▽u|^(2)p-2/2)▽u)=-div(|f|^(p-2)f)+g inΩ,u=h in■Ω,with the(sub-elliptic)degeneracy condition s∈[0,1]and with mixed data f∈L^(p)(Q;R^(n)),g∈Lp/(p-1)(Ω;R^(n))for p∈(1,n).This problem naturally arises in various applications such as dynamics of non-Newtonian fluid theory,electro-rheology,radiation of heat,plastic moulding and many *** on the idea of level-set inequality on fractional maximal distribution functions,it enables us to carry out a global regularity result of the solution via fractional maximal *** to the significance of M_(α)and its relation with Riesz potential,estimates via fractional maximal functions allow us to bound oscillations not only for solution but also its fractional derivatives of orderα.Our approach therefore has its own interest.

关键词： gradient estimates p-Laplace quasilinear elliptic equation fractional maximal operators Lorentz-Morrey spaces

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Context-specific chromatin remodeling activity of mSWI/SNF complexes depends on the epigenetic landscape

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Signal Transduction and Targeted Therapy 2021年第11期6卷 3159-3160页

作者： Godwin Sokpor Huu phuc nguyen Tran Tuoc Department of Human Genetics Ruhr University of BochumBochumGermany

A recent article published in Science reveals how the mammalian SWI/SNF (mSWI/SNF) complexes utilize epigenetic cues in the chromatin landscape for differential chromatin remodeling.1 The heteromultimeric ATP-dependent SWI/SNF complexes can alter chromatin architecture leading to gene expression modulation (Fig. 1). Combinatorial and modular assembly of mSWI/SNF complex subunits2 partly underscore their heterogeneity and tissue-specific downstream effects. Given their implication in numerous diseases, including cancers3 and neurodevelopmental disorders,4 the mSWI/SNF or BAF complexes have attracted interest in elucidating their precise action to lend therapeutic ideas. The work of Mashtalir et al.1 has deepened our understanding by decoding the signals which instruct the assembly, localization, and activity of mSWI/SNF complexes. They provide experimental confirmation that the mSWI/SNF complexes depend on single and/or summative histone/nucleosome signatures and subunit modules to determine their activity (Fig. 1).

关键词： complexes utilize specific

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Machine learning for integrating combustion chemistry in numerical simulations

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Energy and AI 2021年第3期5卷 330-338页

作者： Huu-Tri nguyen Pascale Domingo Luc Vervisch phuc-Danh nguyen CORIA-CNRS Normandie UniversitéINSA Rouen NormandieSaint-Etienne-du-Rouvray 76801France ArcelorMittal Global Research and Development Maiziéres-lés-Metz 57280France

A strategy based on machine learning is discussed to close the gap between the detailed description of combustion chemistry and the numerical simulation of combustion ***,the partial differential equations describ-ing chemical kinetics are stiffand involve many degrees of freedom,making their solving in three-dimensional unsteady simulations very *** is discussed in this work how a reduction of the computing cost by an order of magnitude can be achieved using a set of neural networks trained for solving *** ther-mochemical database used for training is composed of time evolutions of stochastic particles carrying chemical species mass fractions and temperature according to a turbulent micro-mixing problem coupled with complex *** novelty of the work lies in the decomposition of the thermochemical hyperspace into clusters to facilitate the training of neural *** decomposition is performed with the Kmeans algorithm,a local principal component analysis is then applied to every *** new methodology for combustion chemistry reduction is tested under conditions representative of a non-premixed syngas oxy-flame.

关键词： Combustion chemistry Micro-mixing modeling Principal component analysis Artificial neural network Chemistry reduction

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