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Remote sensing-based estimation of rice yields using various models:A critical review

Geo-Spatial Information Science 2021年第4期24卷 580-603页

作者： Daniel Marc G dela Torre Jay Gao Cate Macinnis-ng School of Environment University of AucklandAucklandNew Zealand School of Biological Sciences University of AucklandAucklandNew Zealand

Reliable estimation of region-wide rice yield is vital for food security and agricultural ***-scale models have increased our understanding of rice yield and its estimation under theoretical environmental ***,they offer little infor-mation on spatial variability effects on farm-scale *** Sensing(RS)is a useful tool to upscale yield estimates from farm scales to regional *** research used RS with rice models for reliable yield *** several countries start to operatio-nalize rice monitoring systems,it is needed to synthesize current literature to identify knowledge gaps,to improve estimation accuracies,and to optimize *** paper critically reviewed significant developments in using geospatial methods,imagery,and quantitative models to estimate rice ***,essential characteristics of rice were discussed as detected by optical and radar sensors,band selection,sensor configuration,spatial resolution,mapping methods,and biophysical variables of rice derivable from RS ***,various empirical,process-based,and semi-empirical models that used RS data for spatial estimation of yield were critically assessed-discussing how major types of models,RS platforms,data assimilation algorithms,canopy state variables,and RS variables can be integrated for yield ***,to overcome current constraints and to improve accuracies,several possibilities were suggested-adding new modeling modules,using alternative canopy variables,and adopting novel modeling *** rice yields are expected to decrease due to global warming,geospatial rice yield estimation techniques are indispensable tools for climate change *** studies should focus on resolving the current limitations of estimation by precise delineation of rice cultivars,by incorporating dynamic harvesting indices based on climatic drivers,using innovative modeling approaches with machine learning.

关键词： Process-based crop model data assimilation empirical model geospatial applications remote sensing rice yield mapping yield estimation

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The RNA Pol Ⅱ sub-complex hsRpb4/7 is required for viability of multiple human cell lines

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Protein & Cell 2012年第11期3卷 846-854页

作者： Yang zhao Kim K.C.Li King Pan ng Chi Ho ng Kevin A.W.Lee Division of Life Science The Hong Kong University of Science and TechnologySai KungHong Kong S.A.R.China

The evolutionarily conserved RNA Polymerase Ⅱ Rpb4/7 sub-complex has been thoroughly studied in yeast and impacts gene expression at multiple levels including transcription,mRNA processing and *** addition Rpb4/7 exerts differential effects on gene expression in yeast and Rpb4 is not obligatory for yeast(***)*** roles for human(hs)Rpb4/7 have not been extensively described and we have probed this question by depleting hsRpb4/7 in established human cell lines using RNA *** find that Rpb4/7 protein levels are inter-dependent and accordingly,the functional effects of depleting either protein are ***4/7 exhibits gene-specific effects and cells initially remain viable upon hsRpb4/7 *** prolonged hsRpb4/7 depletion is cytotoxic in the range of cell lines *** cell death occurs by an unknown mechanism and in some cases is accompanied by a pronounced elongated cell *** conclusion we provide evidence for a gene-specific role of hsRpb4/7 in human cell viability.

关键词： RNA PolymeraseⅡ hsRpb4/7 sub-complex gene expression cell viability cell shape

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Involvement of apoptosis of alveolar epithelial cells in acute pancreatitis-associated lung injury

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World Journal of Gastroenterology 2000年第6期6卷 920-924页

作者： Yuan YZ Gong zh Lou KX Tu SP zhai ZK Xu JY Shanghai Med Univ 2 Ruijin Hosp Dept Gastroenterol Shanghai 200025 Peoples R China

INTRODUCTIONAcute pancreatitis in a common and potentially fataldisease which is associated with considerablemorbidity and a mortality rate of approximately30%;its pathogenesis remains *** of death is often due to mul... 详细信息

关键词： pancreatitis lung/injuries apoptosis protein P53 immunohistochemistry platelet activating factor

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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

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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.

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The use of antimuscarinics,phosphodiesterase type Ⅴ inhibitors and phytotherapy for lower urinary tract symptoms in men

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Asian Journal of Urology 2017年第3期4卷 191-194页

作者： Kok Kit ng Foo Cheong ng Department of Urology Changi General HospitalSingapore

Besides the mainstay of α-blockers and 5α-reductase inhibitors,other forms of medical therapy complete the armamentarium in the treatment of lower urinary tract symptoms(LUTS)in *** treatments can target specific symptoms as well as associated symptoms that would affect the quality of life of the *** patients are bothered by storage symptoms,more so than the voiding *** are efficacious and safe,provided the patients do not have high post void residual *** patients with LUTS also have erectile dysfunction,and phosphodiesterase type Ⅴ inhibitors are effective in relieving both LUTS as well as erectile dysfunction for such *** provides a popular and safe treatment for LUTS,however,the efficacy of the treatment has not been proven in well conducted prospective randomized controlled studies.

关键词： Benign prostatic hyperplasia Erectile dysfunction Lower urinary tract symptoms Muscarinic antagonists Phosphodiesterase 5 inhibitors Phytotherapy

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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

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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 zh.ng 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

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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

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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.

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