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Quasi-static simulations of compact polydisperse particle systems

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Particuology 2010年第2期8卷 119-126页

作者： colin Thornton School of Civil Engineering University of Birmingham Birmingham UK

The Discrete Element Method （DEM） was originally devised by Cundail and Strack （1979）, as a technique to examine the micromechanics of granular media with the anticipation that this would lead to more physically reliable continuum theories to describe the quasi-static deformation of granular material such as sand. However, the methodology models the evolution of a system of particles as a dynamic process. Consequently there have been numerous publications of the application of DEM to an increasingly wider variety of problems in many areas of engineering and science. This paper, however, focuses on the orig- inal motivation for DEM and attempts to provide a state-of-the-art understanding of the quasi-static deformation of granular media. 2009 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

关键词： Discrete Element MethodQuasi-static deformationGranular media

Incident prevention tools-incident investigations and pre-job safety analyses

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International Journal of Mining Science and Technology 2017年第4期27卷 635-640页

作者： Morrish colin Chartered Safety & Health Practitioner 137 Sea Road Westgate-on-Sea UK

Careful and thorough incident investigations and pre-job safety analyses completed by knowledgeable and competent individuals can significantly reduce workplace incidents. Working parties must act together to make these safety tools effective. To get the staff units to work together in a co-ordinated manner, they must be shown the value of their work in preventing accidents. Examples of actual accidents investigated during the author's 18 years as a mine inspector in Saskatchewan are discussed within the context of pre-job safety analyses. The causes of the accidents are explored with close reference to how pre-job safety analyses could have prevented their occurrence.

关键词： Accident prevention Incident investigations Pre-job safety analysis Directives Working parties Behaviour change whee Actual cases

Pilot plants of membrane technology in industry:Challenges and key learnings

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Frontiers of Chemical Science and Engineering 2020年第3期14卷 305-316页

作者： colin A.Scholes Peter Cook Centre for Carbon Capture and Storage Research Department of Chemical EngineeringThe University of MelbourneVIC3010Australia

Membrane technology holds great potential in gas separation applications,especially carbon dioxide capture from industrial *** achieve this potential,the outputs from global research endeavours into membrane technologies must be trialled in industrial processes,which requires membrane-based pilot *** pilot plants are critical to the commercialization of membrane technology,be it as gas separation membranes or membrane gas-solvent contactors,as failure at the pilot plant level may delay the development of the technology for ***,the author reports on his experience of operating membrane-based pilot plants for gas separation and contactor configurations as part of three industrial carbon capture initiatives:the Mulgrave project,H3 project and Vales Point ***,the challenges of developing and operating membrane pilot plants are presented,as well as the key learnings on how to successfully manage membrane pilot plants to achieve desired performance *** purpose is to assist membrane technologists in the carbon capture field to achieve successful outcomes for their technology innovations.

关键词： membrane gas separation membrane contactors carbon capture pilot plants key learnings

Systematics of the Artiodactyla of China in the 21st century

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Zoological Research 2016年第3期37卷 119-125页

作者： colin Groves School of Archaeology & Anthropology Australian National University Canberra ACT 2600 Australia. colin.groves@anu.edu.au.

In this paper, I have introduced the concept of the Evolutionary Species, and shown how it affects the taxonomy of the Artiodactyla of China. The ＂traditional＂ taxonomy of the Artiodactyla, which has remained almost unchanged for 100 years, relies on ill-formulated notions of species and subspecies, only slightly modified by the population-thinking of the 1930s. Species are populations （or metapopu- lations） differentiated by the possession of fixed heritable differences from other such populations （or metapopulations）. In the Artiodactyla, there are many more species than ＂traditionally＂ recognised; this is by no means a drawback, as it enables the units of biodiversity to be identified in a testable fashion, and brings the taxonomy of large mammals into line with that long practised for small mammals. Species are likely to differentiate where there are natural gaps in the distribution of a genus, such as mountain blocks （for example in the genus Budorcas） or otherwise dissected habitat （for example in the genus Cervus）. Natural hybridisation between distinct species is not an uncommon phenomenon, again illustrated well in the genus Cervus, where hybridisation between the elaphus and nippon groups occurs today and evidently occurred in the past, as shown by the distribution of mtDNA.

关键词： Artiodactyla Taxonomy China Evolu-tionary species Phylogenetic species concept

Eventual Positivity of Hermitian Polynomials and Integral Operators

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Chinese Annals of Mathematics,Series B 2016年第1期37卷 83-94页

作者： colin TAN Department of Mathematics National University of Singapore Block S17 10 Lower Kent Ridge Road Singapore 119076.

Quillen proved that if a Hermitian bihomogeneous polynomial is strictly positive on the unit sphere, then repeated multiplication of the standard sesquilinear form to this polynomial eventually results in a sum of Hermitian squares. Catlin-D'Angelo and Varolin deduced this positivstellensatz of Quillen from the eventual positive-definiteness of an associated integral operator. Their arguments involve asymptotic expansions of the Bergman kernel. The goal of this article is to give an elementary proof of the positive-definiteness of this integral operator.

关键词： Asymptotics Polynomial Positivity

Late Quaternary clay minerals off Middle Vietnam in the western South China Sea: Implications for source analysis and East Asian monsoon evolution

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Science China Earth Sciences 2007年第11期50卷 1674-1684页

作者： Christophe colin Laboratoire IDES UMR 8148 CNRS Université de Paris XI Orsay 91405 France

High-resolution clay mineral records combined with oxygen isotopic stratigraphy over the past 450 ka during late Quaternary from Core MD05-2901 off Middle Vietnam in the western South China Sea are re-ported to reconstruct a history of East Asian monsoon evolution. Variations in Illite, chlorite, and kaolinite contents indicate a strong glacial-interglacial cyclicity, while changes in smectite content present a higher frequency cyclicity. The provenance analysis indicates a mixture of individual clay minerals from various sources surrounding the South China Sea. Smectite derived mainly from the Sunda shelf and its major source area of the Indonesian islands. Illite and chlorite originated mainly from the Mekong and Red rivers. Kaolinite was provided mainly by the Pearl River. Spectral analysis of the kaolin-ite/(illite+chlorite) ratio displays a strong eccentricity period of 100 ka, implying the ice sheet-forced win-ter monsoon evolution; whereas higher frequency changes in the smectite content show an ice sheet-forced obliquity period of 41 ka, and precession periods of 23 and 19 ka and a semi-precession period of 13 ka as well, implying the tropical-forced summer monsoon evolution. The winter monsoon evolution is generally in coherence with the glacial-interglacial cyclicity, with intensified winter monsoon winds during glacials and weakened winter monsoon winds during interglacials; whereas the summer monsoon evolution provides an almost linear response to the summer insolation of low latitude in the Northern Hemisphere, with strengthened summer monsoon during higher insolation and weakened summer monsoon during lower insolation. The result suggests that the high-latitude ice sheet and low-latitude tropical factor could drive the late Quaternary evolution of East Asian winter and summer monsoons, respectively, implying their diplex and self-contained forcing mechanism.

关键词： clay minerals,provenance,East Asian monsoon,late Quaternary,Middle Vietnam,South China Sea

Cybertaxonomy to accomplish big things in aphid systematics

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Insect Science 2014年第3期21卷 392-399页

作者： colin Favret Department of Biological Sciences University of Montreal Biodiversity Centre 4101 rue Sherbrooke est Montreal Quebec Canada

Biodiversity sciences have progressed at such a pace that the taxonomic community has been unable to grow concomitantly to keep up with the influx of biologicaldata. This ＂taxonomic impediment＂ has led some to suggest that taxonomy is no longer pertinent and to the development of methodologies that circumvent the taxonomic *** article does not seek to argue for the importance of taxonomy but rather is a call to the aphid taxonomy community to rise to the challenge by dramatically increasing the volume and comprehensiveness of its output without sacrificing quality. Recent informatics technology allows us to mobilize the 2 most important aphid taxonomy resources： expertsand specimens, both distributed globally. ＂Cyberspecimens,＂ museum specimens digitally rendered at a resolution sufficient for remote identification, and open ＂cybertaxonomic＂tools will allow the international aphid taxonomic community to carry out large, ambitious, projects. The global aphid cybertaxonomy proposed here will serve not only the ends ofresearch aphidologists, but also provide a model for other taxonomic communities to adapt and adopt as we confront both the taxonomic impediment and the taxonomic naysayers.

关键词： Aphididae collection cyberspecimen database museum specimen

A plant-based diet and animal protein： questioning dietary fat and consideringanimal protein as the main cause of heart disease

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Journal of Geriatric Cardiology 2017年第5期14卷 331-337页

作者： Thomas colin Campbell Emeritus of Nutritional Biochemistry Cornell University 8 Fiddlers Green Lansing NY 14882 USA.

Dietary ＇fat＇（e.g., oils, triglycerides, cholesterol） haslong been considered a major risk factor for cardiovascularand related diseases. As reviewed elsewhere,Vogel in1847 identified cholesterol as a major compo... 详细信息

关键词： Cardiovascular disease Cholesterol Dietary protein

Eventual Positivity of Hermitian Algebraic Functions and Associated Integral Operators

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Chinese Annals of Mathematics,Series B 2020年第6期41卷 967-988页

作者： colin TAN Wing-Keung TO Department of Statistics&Applied Probability National University of Singapore Current address:Science Mat hematics and TechnologySingapore University of Technology and Design8 Somapah RoadSingapore 487372 Department of Mathematics National University of SingaporeBlock S1710 Lower Kent Ridge RoadSingapore 119076

Quillen proved that repeated multiplication of the standard sesquilinear form to a positive Hermitian bihomogeneous polynomial eventually results in a sum of Hermitian squares,which was the first Hermitian analogue of Hilbert s seventeenth problem in the nondegenerate *** Catlin-D’Angelo generalized this positivstellensatz of Quillen to the case of Hermitian algebraic functions on holomorphic line bundles over compact complex manifolds by proving the eventual positivity of an associated integral *** arguments of Catlin-D’Angelo involve subtle asymptotic estimates of the Bergman *** this article,the authors give an elementary and geometric proof of the eventual positivity of this integral operator,thereby yielding another proof of the corresponding positivstellensatz.

关键词： Hermitian algebraic functions Integral operators Positivity