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Heterogeneous numerical modelling for the auto thermal reforming of crude glycerol in a fixed bed reactor

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Chinese Journal of Chemical Engineering 2022年第2期35卷 261-268页

作者： Jason Williams Hussameldin Ibrahim Nima Karimi Kelvin Tsun Wai ng Clean Energy Technologies Research Institute Process Systems EngineeringFaculty of Engineering and Applied ScienceUniversity of ReginaRegina SK S4S 0A2Canada Environmental Systems Engineering Faculty of Engineering and Applied ScienceUniversity of ReginaRegina SK S4S 0A2Canada

A mathematical model for the catalytic autothermal reforming(ATR)reaction of synthetic crude glycerol to hydrogen in a fixed bed tubular reactor(FBTR)and over an in-house developed metal oxide catalyst is presented in this *** heterogeneous model equations account for a two-phase system of solid catalyst and bulk feed ***,the ATR of crude glycerol reaction scheme and intrinsic kinetic rate model over an active,selective,and stable nickel-based catalyst were integrated in the developed ***,the model was validated using experimental data generated in our labs for the ATR of synthetic crude *** modelling results adequately described the detailed gas product composition and distribution,temperature profiles,and conversion propagation in the axial direction of the fixed bed reactor over a wide range of reaction temperature(773–923 K)and mass-time(12.71–158.23 g cat·min·(mol C)^(-1)).The crude glycerol conversion predicted with the model showing a close resemblance to those obtained experimentally with an average absolute deviation(AAD)of less than 8%.The maximum crude glycerol conversion and hydrogen yield were found to be 92%and 3 mol hydrogen/mol crude glycerol,***,the gas product concentration profile in the reactor was adequately described(90%)accuracy with a hydrogen concentration of 39%(volume).

关键词： Hydrogen crude glycerol Autothermal reforming Numerical analysis Fixed-bed reactor

RATIONAL GENERAL SOLUTIONS OF HIGHER ORDER ALGEBRAIC ODES

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Journal of Systems Science & Complexity 2013年第2期26卷 261-280页

作者： HUAng Yanli ng L X Chu WINKLER Franz School of Computer Science and Software Engineering Tianjin Polytechnic University Research Institute for Symbolic Computation(RISC) Johannes Kepler University Department of Mathematics Quy Nhon University

This paper generalizes the method of ng6 and Winkler （2010, 2011） for finding rational general solutions of a first order non-autonomous algebraic ordinary differential equation （AODE） to the case of a higher order AODE, provided a proper parametrization of its solution hypersurface. The authors reduce the problem of finding the rational general solution of a higher order AODE to finding the rational general solution of an associated system. The rational general solutions of the original AODE and its associated system are in computable 1-1 correspondence. The authors give necessary and sufficient conditions for the associated system to have a rational solution based on proper reparametrization of invariant algebraic space curves. The authors also relate invariant space curves to first integrals and characterize rationally solvable systems by rational first integrals.

关键词： Algebraic ODE associated system invariant algebraic space curve rational first integral rational general solution.

THERMAL　DECOMPOSITION　PROCESSES　OF　POLYANILINE　AND　POLY－O－TOLUIDINE　INVESTIGATED　BY　DIRECT　PYROLYSIS　MASS　SPECTROMETRY

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Chinese Chemical Letters 1995年第5期6卷 403-406页

作者： Xie, hw Liu, SY Wang, LX Shun, YQ Chinese Acad Sci Changchun Inst Appl Chem Changchun 130022 Peoples R China

The thermal decmpos ition of polyani line(PAn) and poly-o-toluidine (POT)was studied by means of direct pyrolysis mass spectrometry (DPMS) and MS/MS. The results showed that both benzene-diamine and guinone-diimine units were produced,and the intensities of fragments corresponding to quinone-diimine units increased as the oxidation degrees increased The mechanism of thermal decomposition of PAn and POT was given for the first time.

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Theoretical investigation on mechanism of dissociation of furan

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Chinese Science Bulletin 1997年第11期42卷 910-914页

作者： Feng, WL Wang, YH Zhang, SW Xi, hw Pang, XY Department of Chemistry Beijing Normal University Beijing China Department of Resource and Engineering Beijing University of Science and Technology Beijing Beijing China Department of Applied Chemistry Taiyuan Industrial University Taiyuan China

RECENTLY much attention has been paid to the mechanism of the dissociation of *** reason is not only that some neutral molecules by ultraviolet（UV）light mayproduce C4H4O+,but also that the investigation of this mech... 详细信息

关键词： furan cation barrier surface of dissociation process transition state intermediate.

Virtual Garment Sewing

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Journal of Donghua University(English Edition) 2004年第6期21卷 128-133页

作者：马良胡金莲 George Baciu Sau-fun ng Frency Yuet-ming ng Judyanna Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong KongDr Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong

This paper presents an efficient and realistic approach to seam the 2D panels together into a 3D garment mesh. Our main goal is to be able to seam any kind of panels together robotically without considering the variation of style and geometry. In particular, we are discussing difficult situations with respect to deformations and variation of sewing forces Based on the mass-spring model, two-dimensional panels are seamed together along the seams and then three-dimensional garment meshes are built. Our main contribution is that we add five pairs of sewing forces avoiding undesirable sharp folds. Our approach provides a useful design tool to create 3D garment mesh directly in the 3D space through 2D patterns. It is reasonably easy to incorporate our 3D mesh construction techniques into existing 3D graphics systems because we use standard triangular mesh structures and force-based mass-spring model for cloth animation.

关键词： Virtual Sewing, CAD, 3D, Garment

Positive combinations of projections in von Neumann algebras and purely infinite simple C*-algebras

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Science China Mathematics 2011年第11期54卷 2383-2393页

作者： KAFTAL Victor ng PingWong ZHAng Shuang Department of Mathematics University of Cincinnati Cincinnati Ohio 45221-0025 USA Department of Mathematics University of Louisiana at Lafayatte Lafayette Louisiana 70504-1010 USA

We give an overview of the question： which positive elements in an operator algebra can be written as a linear combination of projections with positive coefficients. A special case of independent interest is the question of which positive elements can be written as a sum of finitely many projections. We focus on von Neumann Mgebras, on purely infinite simple C^＊-algebras, and on their associated multiplier algebras.

关键词： C^*-algebras linear combinations positive combinations projections

Alkali and Silane Treatments towards Exemplary Mechanical Properties of Kenaf and Pineapple Leaf Fibre-reinforced Composites

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Journal of Bionic Engineering 2020年第2期17卷 380-392页

作者： ng Lin Feng Sivakumar Dhar Malingam Nadlene Razali Sivarao Subramonian Centre for Advanced Research on Energy Fakulti Kejuruteraan MekanikalUniversiti Teknikal Malaysia MelakaMelaka 76100Malaysia Fakulti Kejuruteraan Pembuatan Universiti Teknikal Malaysia MelakaMelaka 76100Malaysia

Following the contemporary research trend of exploring the potential of eco-friendly natural fibres,this work studies the effects of alkali and silane treatments,with varying concentrations,on the mechanical characterization of composites reinforced with kenaf and pineapple leaf fibre(PALF).Kenaf-and PALF-based composites were fabricated through the heat compression *** mechanical characterization was then performed to evaluate the tensile,flexural and impact *** findings concluded that chemical treatments indeed enhanced the mechanical properties of composite materials.5%NaOH and 3%silane treatments can respectively provide the optimum mechanical properties to the kenaf fibre and PALF reinforced *** treatment results evidenced that silane-treated composites exhibit higher mechanical properties compared to the NaOH-treated *** comparing the mechanical properties of kenaf-and PALF-reinforced polypropylene composites,the overall results show that composites based on PALF have superior mechanical properties.

关键词： natural fibres kenaf fibre pineapple leaf fibre chemical treatment mechanical properties

Multi-Phase Texture Segmentation Using Gabor Features Histograms Based on Wasserstein Distance

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Communications in Computational Physics 2014年第5期15卷 1480-1500页

作者： Motong Qiao Wei Wang Michael ng Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong Department of Mathematics Tongji UniversityShanghai 200092China Centre for Mathematical Imaging and Vision and Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong.

We present a multi-phase image segmentation method based on the histogram of the Gabor feature space,which consists of a set of Gabor-filter responses with various orientations,scales and *** model replaces the error function term in the original fuzzy region competition model with squared 2-Wasserstein distance function,which is a metric to measure the distance of two *** energy functional is minimized by alternative minimization method and the existence of closed-form solutions is guaranteed when the exponent of the fuzzy membership term being 1 or *** test our model on both simple synthetic texture images and complex natural images with two or more *** results are shown and compared to other recent results.

关键词： Multi-phase texture segmentation Wasserstein distance Gabor filter Mumford-Shah model.

Effects of hedgerows on sediment erosion in Three Gorges Dam Area, China

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International Journal of Sediment Research 2008年第2期23卷 119-129页

作者： Sai-Leung ng Kwai-Cheong CHAU Department of Geography and Resource Management the Chinese University of Hong KongHong KongChinaProf

The Three Gorges Dam Area refers to the river section from Chongqing to Yichang on the Yangtze River,which has a drainage area of 75,098 km2,and involves 19 cities and *** hedgerows have been used in this area to control soil erosion and to improve hillslope stability in the catchment of this river *** experimental hedgerow plots were established in 1994 in order to study the effects of hedgerows on erosion *** the period of 1994-1997,runoff and soil loss data were collected on these test plots,including the chemical and physical properties of soil and related topographical *** results indicate that:(1) after 4 years of cultivation and crop planting,soil fertility increased dramatically in the hedgerow *** organic matter,total nitrogen,and total phosphorus contents in the hedgerow plots were 5-9 times higher than that in the control *** each of the hedgerow plots,soil structure became more stable,the quantity of granules larger than 0.02 mm increased and those finer than 0.02 mm decreased;(2) All hedgerow plots showed a major effect on reducing soil loss and surface runoff;(3) Overland flow velocity along the upper portion of the hedgerow plots was greatly reduced due to hedgerow resistance,which explains the significant decrease in soil losses in hedgerow plots,despite the fact that the hedgerow plots and the control plots had the same total runoff.

关键词： Hedgerow Erosion Runoff Soil properties Three Gorges Dam Project