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Stability analysis of a deterministic model of Zika/Dengue co-circulation

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International Journal of Biomathematics 2019年第4期12卷 215-253页

作者： mike Binder Sergei S.Pilyugin Department of Mathematics University of FloridaUSA

We consider a deterministic model of Zika and Dengue viruses co-circulating in a human population. We study the system of differential equations modeling the dynamics of the diseases that can either be transmitted directly (host-to-host) or indirectly (host-vectorhost).We use an SIR model for hosts and an SI model for vectors in the homogeneous populations. The stability of the model has been analyzed both qualitatively and quantitatively.

关键词： Zika Dengue secondary infection

Socio-Economic Impact Assessment of Intelligent Transport Systems

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Tsinghua Science and Technology 2006年第3期11卷 339-350页

作者：隽志才吴建平 mike McDonald Institute of Transportation Studies Shanghai Jiao Tong University Shanghai 200052 China Department of Civil and Environmental Engineering University of Southampton Southampton SO17 1BJ UK

A general review of the socio-economic impact of the intelligent transport system （ITS） is presented with a case study to demonstrate the data envelopment analysis method. Cost-benefit analyses are still the dominant method for evaluating ITS and other transport engineering projects, while cost effective analyses and multi-criteria appraisals are widely used to define and prioritize objectives by providing useful information for the most promising policy decisions. Both cost-benefit analyses and a data envelopment analysis method are applied to analyze the socio-economic impact of convoy driving systems. The main findings are that a convoy provides a worthwhile benefit-cost ratio when more than 30% of the traffics in the convoys and the traffic load exceeds 5500 vehicles/h for a three-lane motorway. The results also show that for a fixed percentage of convoys, increased demand will increase the data envelopment analysis method relative efficiency and that the neglect of certain output indicators of an ITS may result in underestimation of the system effects.

关键词： socio-economic impacts assessment cost-benefit analysis data envelopment analysis intelligent transport system convoy driving

Digital Twin Framework and Its Application to Power Grid Online Analysis

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CSEE Journal of Power and Energy Systems 2019年第3期5卷 391-398页

作者： mike Zhou Jianfeng Yan Donghao Feng China Electric Power Research Institute Beijing 100085China Kedong Electric Power Control System Co. Ltd.Beijing China

Digital twin(DT)framework is introduced in the context of application for power grid online *** the development process of a new power grid real-time online analysis system,an online analysis digital twin(OADT)has been implemented to realize the new online analysis *** OADT approach is presented and its prominent features are *** presentation,discussion,and performance testing are based on a large-scale grid network model(40K+buses),exported directly from the EMS system of an actual power grid.A plan to apply the OADT approach to digitize power grid dispatching rules is also outlined.

关键词： Complex event processing digital twin inmemory computing machine learning neural network model parallel computing power grid online analysis

Genome scan of pigmentation traits in Friesian-Jersey crossbred cattle

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Journal of Genetics and Genomics 2009年第11期36卷 661-666页

作者： Lin Liu Bevin Harris mike Keehan Yuan Zhang Livestock Improvement Corporation Priv. Bag 3016 Hamilton 3240 New Zealand Beijing 100193 China College of Animal Science and Technology China Agricultural University Beijing 100193 China

Pigmentation traits expressed in animals are visual characteristics that allow us to distinguish between breeds and between strains within breed. The objective of this study was to map quantitative trait loci （QTLs） affecting the pigmentation traits in approximately 800 F2 grand daughter dairy cattle from a Holstein-Friesian and Jersey cross breed cattle. Traits analyzed included pigmentation phenotypes on the body, teat and hoop. The phenoypes were collected from digital photos or visual inspection of live animals. QTL mapping was implemented using half-sib and line-of-descent inheritance models. Our analysis initially detected a number of significant QTLs on chromosomes： 2, 6, 13, 15, 18 and 22. The significant QTLs were divided into two groups： one group influencing the pigmentation color and the other group affecting the absence or level of pigmentation. The most significant QTL peaks were observed on Bovine taurus autosome 18 （BTA18） close to melanocortin 1 receptor （MC1R） for the color traits, on BTA6 close to the receptor tyrosine kinase （K/T） and BTA22 close to microphthalmia-associated transcription factor （M/TF） gene for the spotting traits. Association studies were conducted for candidate regions or genes known to affect pigmentation in dairy cattle.

关键词： genome scan pigmentation trait QTL dairy cattle

A Rare Etiology of a Life-Threatening Subdural Hematoma: Case Report and Literature Review

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Modelling the bed characteristics in fluidised-beds for top-spray coating processes

Open Journal of Modern Neurosurgery（现代神经外科学进展） 2024年第2期 108页

作者： Ibrahim Dao Hassan Baallal Narcisse mike Wendpuiré Ouédraogo Ousmane Ouattara

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Particuology 2012年第6期10卷 649-662页

作者： mike Vanderroost Frederik Ronsse Koen Dewettinck Jan G.Pieters Department of Biosystems Engineering Ghent UniversityCoupure links 6539000 GhentBelgium Laboratory of Food Technology and Engineering Ghent UniversityCoupure links 6539000 GhentBelgium

A particle sub-model describing the bed characteristics of a bubbling fluidised bed is presented. Atomisation air, applied at high pressures via a nozzle positioned above the bed for spray formation, is incorporated in the model since its presence has a profound influence on the bed characteristics, though the spray itself is not yet considered. A particle sub-model is developed using well-known empirical relations for particle drag force, bubble growth and velocity and particle distribution above the fluidised-bed surface. Simple but effective assumptions and abstractions were made concerning bubble distribution, particle ejection at the bed surface and the behaviour of atomisation air flow upon impacting the surface of a bubbling fluidised bed, The model was shown to be capable of predicting the fluidised bed characteristics in terms of bed heights, voidage distributions and solids volume fractions with good accuracy in less than 5 min of calculation time on a regular desktop PC. It is therefore suitable for incorporation into general process control models aimed at dynamic control for process efficiency and product quality in top-spray fluidised bed coating processes.

关键词： Fluidised bed Modelling Voidage distribution Fluidised bed characteristics Multiphase flow Coating process

Influence of topographic aspect on floristic diversity, structure and treeline of afromontane cloud forests in the Bale Mountains,Ethiopia

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Journal of Forestry Research 2015年第4期26卷 919-931页

作者： Eshetu Yirdaw mike Starr Mesele Negash Fantaw Yimer Department of Forest Sciences University of Helsinki Wondo Genet College of Forestry and Natural Resources Hawassa University

We studied the influence of east and west aspects on floristic composition, diversity, structure and treeline of afromontane cloud forests at Rira in the Bale Mountains, southeast Ethiopia. In addition, we studied how aspect relates to and/or interacts with other topographic and edaphic factors in influencing vegetation diversity. Strati- fied systematic plot sampling was used to survey the floristic composition, diversity and structure of forests on east- and west-facing slopes. The sample plot size was 20 x 20 m and a total of 36 plots were inventoried. A total of 72 composite soil samples were collected and analysed. Woody species richness of the forest on the east-facing slope was 1.7 times higher than on the west-facing slope. Shannon, Simpson and Log-series alpha diversity indices and evenness of forests on the east-facing slope were sig- nificantly higher than on the west-facing slope. NMDS ordination indicated that the east- and west-facing slopes formed two clusters of species and aspect explained 55.2 % and 10.4 % of the variation in species richness and abun- dance, respectively. There was no significant difference between aspects in stand structure except in dominantheight, which was higher on the east-facing slopes. There was significant interaction between aspect and elevation in influencing woody species diversity. The four plant com- munity groups, which were identified using cluster and indicator species analysis were represented differently on the east and west aspects. The treeline on the east-facing slope （3352 m） was located about 110 m higher than on the west-facing slope （3240 m）. Soil moisture deficiency was unlikely to be a limiting factor on either site. Near the equator, east-west aspect was shown to have considerable impact on floristic composition, diversity, structure, and treeline position of montane forests. Diurnal cloud move- ment patterns and its impact on microclimate of slope aspect should be taken into account in future studies

关键词： Afromontane Aspect Cloud forests Ethiopia Floristic diversity

Modelling overall particle motion in fluidised beds for top-spray coating processes

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Particuology 2013年第5期11卷 490-505页

作者： mike Vanderroost Frederik Ronsse Koen Dewettinck Jan G.Pietersa Department of Biosystems Engineering Ghent UniversityCoupure links 6539000 GhentBelgium Laboratory of Food Technology and Engineering Ghent UniversityCoupure links 6539000 GhentBelgium

A mathematical model predicting the overall particle motion in liquid-sprayed gas-solid fluidised beds has been developed. The proposed model is a superposition of bubble-induced particle motion and particle random walk. The model was validated using experimental particle residence times from literature. Good agreement between experimental and model-predicted residence times was obtained for those cases where atomisation air was absent and on the condition of the inclusion of a so-called ＂dead zone＂. The ＂dead zone＂, being a region of stagnant particles in the annular bottom part of the bed, has also been previously reported in literature. In case atomisation air was present, a less favourable agreement was seen between the model and the experiment. As the atomisatinn air has been shown to significantly alter the ejection distance of particles in the freeboard, recalibration of the ejection height parameter has been demonstrated to obtain an acceptable agreement between model-predicted and experimental data.

关键词： Fluidized bed coatingParticLe residence timeMathematical modelSimulationParticle motion

Applied Fault Detection and Diagnosis for Industrial Gas Turbine Systems

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International Journal of Automation and computing 2017年第4期14卷 463-473页

作者： Yu Zhang Chris Bingham mike Garlick Michael Gallimore School of Engineering University of Lincoln Lincoln LN6 7TS UK Siemens Industrial Turbomachinery Lincoln LN6 3AD UK

The paper presents readily implementable approaches for fault detection and diagnosis （FDD） based on measurements from multiple sensor groups, for industrial systems. Specifically, the use of hierarchical clustering （HC） and self-organizing map neural networks （SOMNNs） are shown to provide robust and user-friendly tools for application to industrial gas turbine （IGT） systems. HC fingerprints are found for normal operation, and FDD is achieved by monitoring cluster changes occurring in the resulting dendrograms. Similarly, fingerprints of operational behaviour are also obtained using SOMNN based classification maps （CMs） that are initially determined during normal operation, and FDD is performed by detecting changes in their CMs. The proposed methods are shown to be capable of FDD from a large group of sensors that measure a variety of physical quantities. A key feature of the paper is the development of techniques to accommodate transient system operation, which can often lead to false-alarms being triggered when using traditional techniques if the monitoring algorithms are not first desensitized. Case studies showing the efficacy of the techniques for detecting sensor faults, bearing tilt pad wear and early stage pre-chamber burnout, are included. The presented techniques are now being applied operationally and monitoring IGTs in various regions of the world.

关键词： Fault detection and diagnosis hierarchical clustering, self-organizing map neural network.