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Physical and mechanical properties of municipal solid waste incineration residues with cement and coal fly ash using X-ray Computed Tomography scanners

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Frontiers of Structural and Civil Engineering 2019年第3期13卷 640-652页

作者： Toshifumi MUKUNOKI ta thi hoai Daisuke FUKUSHIMA Teppei KOMIYA takayuki SHIMAOKA Faculty of Advanced Science and Technology Graduate School of Kumamoto UniversityKumamoto city 860-8555Japan Graduate school of Science and Technology Kumamoto UniversityKumamoto city 860-8555Japan Faculty of Geology VNU University of ScienceVietnam National University Hanoi334 Nguyen TraiHanoiVietnam Water and Material Cycles System Faculty of EngineeringKyushu UniversityFukuoka city 819-0395Japan

A significant volume of Municipal Solid Waste incineration bottom ash and fly ash (i.e.,incineration residues) are commonly disposed as ***,reclamation of landfill sites to create a new land space after their closure becomes an important goal in the current fewer and fewer land availability scenario in many narrow *** objective of this study is to reclaim incineration residue materials in the landfill site by using cement and coal fly ash as stabilizers aiming at performing quality check as new developed materials before future ***,physical and mechanical properties of these new materials should be initially examined at the micro scale,which is the primary fundamental for construction at larger *** research examines quantitative influences of using the combination of cement and coal fly ash at different ratio on the internal structure and ability of strength enhancement of incineration residues when suffering from *** of industrial and micro-focus X-ray computed tomography (CT) scanners combined with an image analysis technique were utilized to characterize and visualize the behavior and internal structure of the incineration residues-cement-coal fly ash mixture under the series of unconfined compression test and curing period *** types of cement solidified incineration residues in term of different curing period (i.e.,7,14,28 days) and coal fly ash addition content (i.e.,0%,9%,18%) were scanned before and after unconfined compression *** was shown that incineration residues solidified by cement and coal fly ash showed an increase in compression strength and deformation modulus with curing time and coal fly ash ***-dimension computed tomography images observation and analysis confirmed that solidified incineration residues including incineration bottom and fly ash as well as cement and coal fly ash have the deliquescent ***,it was studied that stabilized parts play a more im

关键词： mechanical property municipal solid waste incineration residues coal fly ash unconfined compression test image analysis X-Ray Computed Tomography scanners

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留学生现代汉语语气副词“太”、“真”、“可”习得研究

留学生现代汉语语气副词“太”、“真”、“可”习得研究

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作者： ta，thi THU hoai（谢氏秋怀）华中师范大学

学位级别：硕士

语气副词在汉语词汇系统中占有重要位置,而且由于本身的特殊性,它们也一直是对外汉语教学的重难点之一。在汉语的使用中语气副词的出现频率非常高,其中“太”、“真”、“可”三个语气副词具有很强的交际价值。就非汉语母语学习者而言,... 详细信息

语气副词在汉语词汇系统中占有重要位置,而且由于本身的特殊性,它们也一直是对外汉语教学的重难点之一。在汉语的使用中语气副词的出现频率非常高,其中“太”、“真”、“可”三个语气副词具有很强的交际价值。就非汉语母语学习者而言,“太”、“真”、“可”是他们必须要掌握的三个语气副词之一,但在习得和使用过程中仍发生偏误情况。目前,“太”、“真”、“可”在本体研究成果颇丰,但在对外汉语教学的研究却不多。基于这一点,本文通过HSK动态作文语料库着重对留学生“太”、“真”、“可”使用偏误情况进行探究,分析偏误原因,并在此基础上对“太”、“真”、“可”在对外汉语教学中提出一些教学建议。本文先借助北京语言大学现代汉语语料库（BCC语料库）当中的相关语料,对语气副词“太”、“真”、“可”的语义、句法和语用特征进行对比分析,以突出三者在各平面的差异,为学习者提供一个易于辨别三者的基本依据。其次,以北京语言大学HSK动态作文语料库的语料为研究依托,分别对“太”、“真”、“可”使用偏误进行考察、整理,从而归纳、总结偏误类型并对偏误例句加以详细的分析和修改,以帮助留学生走出误区。最后,探讨、分析留学生汉语语气副词“太”、“真”、“可”偏误产生的原因,并面对留学生对“太”、“真”、“可”所产生的偏误类型及原因,提出了一些教学建议,力求帮助留学生更好地理解和掌握“太”、“真”、“可”的用法,避免发生偏误情况。

关键词：语气副词太真可偏误类型偏误原因教学建议

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New Results on System of Generalized Quasi-Ky Fan Inequalities with Set-Valued Mappings in Topological Semilattice Spaces

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Journal of Systems Science & Complexity 2016年第6期29卷 1585-1595页

作者： NGUYEN The Vinh PHAM thi hoai Department of Mathematics University of Transport and Communications School of Applied Mathematics and Informatics University of Science and Technology

Under new assumptions,this paper obtains some extended versions of Ky Fan type inequality for a family of C-continuous set-valued mappings in the setting of topological *** obtained results are new and different from the corresponding known results in the *** special cases of the main result are also *** examples are given to illustrate the results.

关键词： C△-quasiconvex (quasiconcave) Fan-Browder fixed point theorem set-valued Ky Faninequality topological semilattice upper (lower) C-continuous.

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Optimality Conditions and Duality for Nondifferentiable Multiobjective Semi-Infinite Programming Problems with Generalized(C,α,ρ,d)-Convexity

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Journal of Systems Science & Complexity 2015年第1期28卷 47-59页

作者： MISHRA Shashi Kant JAISWAL Monika hoai AN Le thi Department of Mathematics Banaras Hindu University Laboratory of Theoretical and Applied Computer Science LIta UFR MIMUniversity of Lorraine

this paper obtains sufficient optimality conditions for a nonlinear nondifferentiable multiobjective semi-infinite programming problem involving generalized(C,α,ρ,d)-convex *** authors formulate Mond-Weir-type dual model for the nonlinear nondifferentiable multiobjective semiinfinite programming problem and establish weak,strong and strict converse duality theorems relating the primal and the dual problems.

关键词： Duality generalized convexity optimality conditions semi-infinite programming.

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A New Inertial Self-adaptive Gradient Algorithm for the Split Feasibility Problem and an Application to the Sparse Recovery Problem

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Acta Mathematica Sinica,English Series 2023年第12期39卷 2489-2506页

作者： Nguyen The VINH Pham thi hoai Le Anh DUNG Yeol Je CHO Department of Mathematical Analysis University of Transport and Communications3 Cau Giay StreetHanoiVietnam Department of Applied Mathematics School of Applied Mathematics and InformaticsHano University of Science and Technology1 Dai Co Viet RoadHanoiVietnam Department of Mathematics and Informatics Hanoi University of Education136 Xuan ThuyCau GiayHanoiVietnam Department of Mathematics Education Gyeongsang National UniversityJinju52828Republicof Korea

In this paper,by combining the inertial technique and the gradient descent method with Polyak's stepsizes,we propose a novel inertial self-adaptive gradient algorithm to solve the split feasi-bility problem in Hilbert spaces and prove some strong and weak convergence theorems of our method under standard *** examine the performance of our method on the sparse recovery prob-lem beside an example in an infinite dimensional Hilbert space with synthetic data and give some numerical results to show the potential applicability of the proposed method and comparisons with related methods emphasize it further.

关键词： Split feasibility problem CQ algorithm Hilbert space sparse recovery problem

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Morphology and kinematics of the gas envelope of the Mira binary W Aquilae

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Research in Astronomy and Astrophysics 2016年第7期16卷 47-54页

作者： Do thi hoai Pham Tuyet Nhung Pham Ngoc Diep Nguyen thi Phuong Pham Tuan-Anh Nguyen thi Thao Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

We analyse ALMA observations of the12CO（3-2） emission of the circumstellar envelope（CSE）of the Mira variable binary star W Aql. These provide, for the first time, spatially resolved Doppler velocity spectra of the CSE up to angular distances to the central star ofy nature of the observations（only five minutes in each of～5′′（meaning some 2000 AU）. The explorator two different configurations） does not allow for a detailed modelling of the properties of the CSE but provides important qualitative information on its morphology and kinematics. Emission is found to be enhanced along an axis moving from east/west to north-east/south-west when the angular distance from the central star projected on the plane of the sky increases from zero to four arcseconds. In parallel, the Doppler velocity distribution displays asymmetry along an axis moving from east/west to north-west/south-east. The results are discussed in the context of earlier observations, in particular of the dust morphology.

关键词： stars AGB and post-AGB (stars ) circumstellar matter stars individual(W Aql) stars mass-loss radio lines stars

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^(12)CO emission from the Red Rectangle

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Research in Astronomy and Astrophysics 2015年第12期15卷 2213-2228页

作者： Pham Tuan Anh Pham Ngoc Diep Do thi hoai Pham Tuyet Nhung Nguyen thi Phuong Nguyen thi Thao Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

Observations of an unprecedented quality made by ALMA on the Red Rectangle of CO（3-2） and CO（6-5） emissions are analysed jointly with the aim of obtaining as simple as possible a description of the gas morphology and kinematics. Evidence is found for polar conical outflows and for a broad equatorial torus in rotation and expansion. Simple models of both are proposed. Comparing CO（6-5） and CO（3-2） emissions provides evidence for a strong temperature enhancement over the polar outflows. Continuum emission （dust） is seen to be enhanced in the equatorial region. Observed asymmetries are briefly discussed.

关键词： stars: AGB and post-AGB -- circumstellar matter -- radio-lines: stars-- planetary nebulae: individual (Red Rectangle)

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Morphology and kinematics of the gas envelope of the variable AGB star π^1 Gruis

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Research in Astronomy and Astrophysics 2016年第7期16卷 97-104页

作者： Pham Tuyet Nhung Do thi hoai Pham Ngoc Diep Nguyen thi Phuong Nguyen thi Thao Pham Tuan Anh Pierre Darriulat Department of Astrophysics Vietnam National Satellite CenterVAST

Observations of the ^12CO（3–2） emission from the circumstellar envelope（CSE） of the variable star π1Gru using the compact array of the ALMA observatory have been recently made accessible to the public. An analysis of the morphology and kinematics of the CSE is presented with a result very similar to that obtained earlier for ^12CO（2–1） emission using the Submillimeter Array. A quantitative comparison is made using their flared disk model. A new model is presented that provides a significantly better description of the data, using radial winds and smooth evolutions of the radio emission and wind velocity from the stellar equator to the poles.

关键词： stars AGB and post-AGB circumstellar matter star individual(π1Gru) stars massloss radio lines stars

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Impact of chosen force fields and applied load on thin film lubrication

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Friction 2021年第5期9卷 1259-1274页

作者： thi D.ta Hien D.ta Kiet A.TIEU Bach H.TRAN School of Mechanical MaterialsMechatronicsand Biomedical EngineeringUniversity of WollongongNSW 2522Australia Ho Chi Minh City University of Technology and Education Ho Chi Minh City 800010Vietnam

The rapid development of molecular dynamics(MD)simulations,as well as classical and reactive atomic potentials,has enabled tribologists to gain new insights into lubrication performance at the fundamental ***,the impact of adopted potentials on the rheological properties and tribological performance of hydrocarbons has not been researched *** extensive study analyzed the effects of surface structure,applied load,and force field(FF)on the thin film lubrication of *** lubricant film became more solid‐like as the applied load *** particular,with increasing applied load,there was an increase in the velocity slip,shear viscosity,and *** degree of ordering structure also changed with the applied load but rather *** was also significantly dependent on the surface *** chosen FFs significantly influenced the lubrication performance,rheological properties,and molecular *** adaptive intermolecular reactive empirical bond order(AIREBO)potential resulted in more significant liquid‐like behaviors,and the smallest velocity slip,degree of ordering structure,and shear stress were compared using the optimized potential for liquid simulations of united atoms(OPLS‐UAs),condensed‐phase optimized molecular potential for atomic simulation studies(COMPASS),and ***,classical potentials,such as OPLS‐UA and COMPASS,exhibit more solid‐like behavior than reactive potentials ***,owing to the solid‐like behavior,the lubricant temperatures obtained from OPLS‐UA and COMPASS were much lower than those obtained from AIREBO and *** increase in shear stress,as well as the decrease in velocity slip with an increase in the surface potential parameterζ,remained conserved for all chosen FFs,thus indicating that the proposed surface potential parameterζfor the COMPASS FF can be verified for a wide range of atomic models.

关键词： molecular dynamics simulation force fields applied load tribofilm hydrocarbon

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ALMA observations of the circumstellar envelope around EP Aqr

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Research in Astronomy and Astrophysics 2019年第3期19卷 97-110页

作者： Pham thi Tuyet Nhung Do thi hoai Pham Tuan-Anh thibaut Le Bertre Pierre Darriulat Pham Ngoc Diep Nguyen thi Phuong Nguyen thi Thao Jan Martin Winters Department of Astrophysics Vietnam National Space CenterVAST LERMA UMR 8112 CNRS and Observatoire de Paris PSL Research University Graduate University of Science and Technology VAST IRAM 300 rue de la Piscine Domaine Universitaire

Atacama Large Millimetre/sub-millimetre Array(ALMA) observations of CO(1–0) and CO(2–1) emissions from the circumstellar envelope of the asymptotic giant branch(AGB) star EP Aqr have been made with four times better spatial resolution than previously available. They are analysed with emphasis on the de-projection in space of the effective emissivity and flux of matter using as input a prescribed configuration of the velocity field, assumed to be radial. The data are found to display an intrinsic axisymmetry with respect to an axis making a small angle with respect to the line of sight. A broad range of wind configurations, from prolate(bipolar) to oblate(equatorial) has been studied and found to be accompanied by significant equatorial emission. Qualitatively, the effective emissivity is enhanced near the equator to produce the central narrow component observed in the Doppler velocity spectra and its dependence on star latitude generally follows that of the wind velocity with the exception of an omni-present depression near the poles. In particular, large equatorial expansion velocities produce a flared disc or a ring of effective emissivity and mass loss. The effect on the determination of the orientation of the star axis of radial velocity gradients, and possibly competing rotation and expansion in the equatorial disc, is discussed. In general,the flux of matter is found to reach a broad maximum at distances of the order of 500 AU from the *** are given that may be used to favour one wind velocity distribution over another. As a result of the improved quality of the data, a deeper understanding of the constraints imposed on morphology and kinematics has been obtained.

关键词： stars: AGB and post-AGB (stars:) circumstellar matter stars: individual: EP Aqr stars:mass-loss radio lines: stars

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