Browsing Research Articles (Mathematical Sciences) by Title

Now showing items 16-35 of 58

    • Effects of agricultural intensification on ability of natural enemies to control aphids 

      Zhao, Zi-Hua; Hui, Cang; He, Da-Han; Li, Bai-Lian (Springer Nature, 2015-01-26)
      Agricultural intensification through increasing fertilization input and cropland expansion has caused rapid loss of semi-natural habitats and the subsequent loss of natural enemies of agricultural pests. It is however extremely ...

    • Entropy generation in a couple stress fluid flow through a vertical channel filled with saturated porous media 

      Makinde, Oluwole Daniel; Eegunjobi, Adetayo Samuel (MDPI, 2013-10-25)
      The present work investigates numerically the inherent irreversibility in a steady flow of a couple stress fluid through a vertical channel packed with saturated porous substances. The First and Second Laws of Thermodynamics ...

    • Francis Guthrie : a colourful life 

      Maritz, Pieter; Mouton, Sonja (Springer, 2012-09)
      In 1852, in London, Francis Guthrie posed the question of colouring a map with four colours only, the question that eventually became known as the Four Colour Problem. The problem is famous, but what else do we know of ...

    • Frequent toggling between alternative amino acids Is driven by selection in HIV-1 

      Delport, Wayne; Scheffler, Konrad; Seoighe, Cathal (Public Library of Science, 2008)
      Host immune responses against infectious pathogens exert strong selective pressures favouring the emergence of escape mutations that prevent immune recognition. Escape mutations within or flanking functionally conserved ...

    • A general method for parameter estimation in light-response models 

      Chen, Lei; Li, Zhong-Bin; Hui, Cang; Cheng, Xiaofei; Li, Bai-Lian; Shi, Pei-Jian (Springer Nature, 2016)
      Selecting appropriate initial values is critical for parameter estimation in nonlinear photosynthetic light response models. Failed convergence often occurs due to wrongly selected initial values when using currently ...

    • A geometrical model for testing bilateral symmetry of bamboo leaf with a simplified Gielis equation 

      Lin, Shuyan; Zhang, Li; Reddy, Gadi V. P.; Hui, Cang; Gielis, Johan; Ding, Yulong; Shi, Peijian (Wiley Open Access, 2016)
      The size and shape of plant leaves change with growth, and an accurate description of leaf shape is crucial for describing plant morphogenesis and development. Bilateral symmetry, which has been widely observed but poorly ...

    • The geometry of unitary 2-representations of finite groups and their 2-characters 

      Bartlett, Bruce (Springer Link, 2011-02)
      Motivated by topological quantum field theory, we investigate the geometric aspects of unitary 2-representations of finite groups on 2-Hilbert spaces, and their 2-characters. We show how the basic ideas of geometric ...

    • Global stability analysis and control of leptospirosis 

      Okosun, Kazeem Oare; Mukamuri, M.; Makinde, Daniel Oluwole (De Gruyter Open, 2016)
      The aim of this paper is to investigate the effectiveness and cost-effectiveness of leptospirosis control measures, preventive vaccination and treatment of infective humans that may curtail the disease transmission. ...

    • Historic bells in Moravian Missions in South Africa's Western Cape 

      De Wet, Tertius; Teugels, Jef L.; Van Deventer, Pieta (Historical Association of South Africa, 2014-11)
      The Moravian Church was the first denomination to begin with missionary work among the indigenous people in South Africa and today the church still has a very strong presence in the country. After opening their first mission ...

    • The impact of land abandonment on species richness and abundance in the Mediterranean Basin : a meta-analysis 

      Plieninger, Tobias; Hui, Cang; Gaertner, Mirijam; Huntsinger, Lynn (PLoS, 2014-05-27)
      Land abandonment is common in the Mediterranean Basin, a global biodiversity hotspot, but little is known about its impacts on biodiversity. To upscale existing case-study insights to the Pan-Mediterranean level, we conducted ...

    • Internode morphometrics and allometry of Tonkin Cane Pseudosasa amabilis 

      Cheng, Liang; Hui, Cang; Reddy, Gadi V. P.; Ding, Yu-Long; Shi, Pei-Jian (John Wiley & Sons Ltd, 2017-10)
      Pseudosasa amabilis (McClure) (Poales: Gramineae) is a typical bamboo species naturally distributed in large area of south China and famous for its culm strength. Although bamboos were found to share the same development ...

    • Invading a mutualistic network : to be or not to be similar 

      Minoarivelo, Henintsoa Onivola; Hui, Cang (Wiley Open Access, 2016)
      Biological invasion remains a major threat to biodiversity in general and a disruptor to mutualistic interactions in particular. While a number of empirical studies have directly explored the role of invasion in mutualistic ...

    • Is invasion success of Australian trees mediated by their native biogeography, phylogenetic history, or both? 

      Miller, Joseph T.; Hui, Cang; Thornhil, Andrew H.; Gallien, Laure; Le Roux, Johannes J.; Richardson, David M. (Oxford University Press on behalf of the Annals of Botany Company, 2017)
      For a plant species to become invasive it has to progress along the introduction-naturalization-invasion (INI) continuum which reflects the joint direction of niche breadth. Identification of traits that correlate with and ...

    • Left ventricular segmentation from MRI datasets with edge modelling conditional random fields 

      Dreijer, Janto F.; Herbst, Ben M.; Du Preez, Johan A. (BioMed Central, 2013-07)
      Background: This paper considers automatic segmentation of the left cardiac ventricle in short axis magnetic resonance images. Various aspects, such as the presence of papillary muscles near the endocardium border, makes ...

    • Model checking rational agents 

      Bordini, Rafael H.; Fisher, Michael; Wooldridge, Michael; Visser, Willem (IEEE - -Institute of Electrical and Electronics Engineers, 2004-10)
      Agent-oriented programming techniques seem appropriate for developing systems that operate in complex, dynamic, and unpredictable environments. We aim to address this requirement by developing model-checking techniques for ...

    • Modeling HIV-1 drug resistance as episodic directional selection 

      Murrell, Ben; De Oliveira, Tulio; Seebregts, Chris; Pond, Sergei L. Kosakovsky; Scheffler, Konrad (PLOS Computational Biology, 2011-05)
      The evolution of substitutions conferring drug resistance to HIV-1 is both episodic, occurring when patients are on antiretroviral therapy, and strongly directional, with site-specific resistant residues increasing in ...

    • Modelling the potential role of media campaigns in ebola transmission dynamics 

      Njankou, Sylvie Diane Djiomba; Nyabadza, Farai (Hindawi Publishing Corporation, 2017)
      A six-compartment mathematical model is formulated to investigate the role of media campaigns in Ebola transmission dynamics. The model includes tweets or messages sent by individuals in different compartments. The media ...

    • Modelling the South African fruit export infrastructure : a case study 

      Ortmann, F. G.; Van Vuuren, J. H.; Van Dyk, F. E. (Operations Research Society of South Africa, 2006)
      A description is provided of work performed as part of the fruit logistics infrastructure project commissioned by the South African Deciduous Fruit Producers’ Trust and coordinated by the South African Council for ...

    • Modelling the trends of inpatient and outpatient rehabilitation for methamphetamine in the Western Cape province of South Africa 

      Mushanyu, J.; Nyabadza, F.; Stewart, A. G. R. (BioMed Central, 2015-12-18)
      Background: Dependence on methamphetamine remains one of the major health and social problem in the Western Cape province of South Africa. We consider a mathematical model that takes into account two forms of rehabilita ...

    • Niche construction on environmental gradients : the formation of fitness valley and stratified genotypic distributions 

      Han, Xiaozhuo; Hui, Cang (PLoS, 2014-06-10)
      The process of niche construction can alter the trajectory of natural selection through organism-environment feedback. As such, the mechanism and impact of niche construction can be better investigated along environmental ...