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Variability of the useful life of reservoirs in tropical locations:A case study from the Burdekin Falls Dam, Australia

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International Journal of Sediment Research 2018年第2期33卷 93-106页

作者： Michelle Cooper stephen e.lewis Thomas C.Stieglitz Scott G.Smithers College of Scilence and engineering James Cook University Centre for Tropical Water ε Aquatic ecosystem Research TropWATER James Cook University

Large dam construction for irrigation, hydropower, water supply, and flood control in tropical to subtropical areas increased markedly after 1950. Many of the dams built during this period have filled with sediment and no longer perform to their original design specifications; in many cases, forecast dam life was greatly overestimated. This study investigates the useful life of Burdekin Falls Dam(BFD), northeastern Australia and compares the findings with other tropical reservoirs. Using two independent methods it is estimated that between 61 and 65 million m3 of sediment has been deposited in the reservoir over the 24 years of operation through 2011. This sediment volume equates to an average of0.15% of capacity lost per year since construction was completed. If current sediment loads/climate regimes persist, reservoir capacity will be reduced by 50% after 345 years. However, the useful life of the BFD reduces to just 276 years when drawdown data are considered; these data show reservoir use would be affected once 40% of storage was filled with sediment, with a 60% drawdown return period of 1 in 15 years. When compared to similar large tropical to sub-tropical reservoirs, the BFD has a slightly longer reservoir useful life than dams in India and a much longer half-life than for both similar-sized and larger dams in China, Brazil, and Iran. Properties of the BFD that promote a longer useful life include a lower trap efficiency, relatively low annual sediment load delivered to the reservoir, limited sediment deposition behind the dam wall(and uniform distribution of deposited sediment), and the export of highly turbid annual floodwaters before settling and deposition of any remaining sediment within the reservoir.

关键词： Reservoir half-life Lake Dalrymple Sediment trapping Trap efficiency Tropical reservoir Useful life

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A simple,azulene-based colorimetric probe for the detection of nitrite in water

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Frontiers of Chemical Science and engineering 2020年第1期14卷 90-96,F0004页

作者： Lloyd C.Murfin Carlos M.Lopez-Alled Adam C.Sedgwick Jannis Wenk Tony D.James Simon e.lewis Department of Chemistry University of BathBath BA27AYUK Centre for Sustainable Chemical Technologies University of BathBath BA27AYUK Department of Chemical engineering and Water Innovation and Research Centre(WIRC@Bath) University of BathBath BA27AYUK

We describe the synthesis and evaluation of an azulene-based chemodosimeter for *** probe was found to undergo two distinct color changes upon introduction of aqueous nitrite ion.A near-instant formation of a grey color provides a qualitative indication of the presence of nitrite,followed by the formation of a deep-yellow/orange color,the endpoint from which quantitative data can be *** azulene probe exhibits 1:1 stoichiometry of reaction with nitrite in water,and is selective for nitrite over other *** azulene probe was applied to determine nitrite content in cured meat,and compared with the British Standard testing procedure(Griess test).The value obtained from the azulene-based probe agreed closely with the standard *** procedure only requires the preparation of one standard solution,instead of the three required for the standard Griess test.

关键词： azulene nitrite diazoquinone

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谷歌中国对峙：两个故事，同一事件对媒体定格与再现谷歌中国事件及中美媒体相关报道的分析

谷歌中国对峙：两个故事，同一事件对媒体定格与再现谷歌中国事件...

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作者： Catherine e.lewis 复旦大学

学位级别：硕士

“当媒体在不同国家报道一个国际事件或国际问题时,是否呈现不同的思想体系?如果情况的确如此,怎样呈现?”针对这个问题,本文通过以实例分析方式入手来寻求答案,以中美报纸媒体对最近谷歌中国事件的报道为样本进行了分析。此项研究采用... 详细信息

“当媒体在不同国家报道一个国际事件或国际问题时,是否呈现不同的思想体系?如果情况的确如此,怎样呈现?”针对这个问题,本文通过以实例分析方式入手来寻求答案,以中美报纸媒体对最近谷歌中国事件的报道为样本进行了分析。此项研究采用批判性语篇分析法,进行了系统地语言剖析,进而解读其隐含的、植入深层的社会结构,权力关系和社会文化意识形态。通过宏观和微观两个层面的分析,并且通过在社会、政治和历史背景下对他们结构的剖析,批判性语篇分析法特别提炼出媒体视角在其会话中“印记”,即深刻持久的影响。该分析揭示了中美双方报道普遍有三个主导性的指导思想——可以界定为“国家身份”、“互联网观念”和“被夸大了的国际形象”。然而,在两国各自构成这三个指导思想的叙事方式和思想基础有着极大的差异,这也导致了对同一事件的截然不同的描述的产生。美国的报道引用了军事术语和国防安全问题以加强其国家身份,同时也通过以霸权的、西方为核心的“民主互联网”模式为参照将中国极端化。中国的报道则脱离其宣传教育特性,以在面对西方模式挑战时坚持“国家信仰”的一种新的姿态巩固其国家身份,同时参照“别国”的情况证明中国互联网审查制度是正常的。本文作者得出如下结论：当两国采用“二元对立”、“异化”、“翻转的东方主义”这样的叙事方式对谷歌和中国这一国际性事件进行报道的时候,的确明显地包含了不同的意识形态结构。

关键词：媒体结构意识形态批判性语境分析谷歌/中国事件媒体表述

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Natural history of Barrett's esophagus

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World Journal of Gastroenterology 2012年第27期18卷 3483-3491页

作者： Rao Milind stephen e Attwood Department of Surgery North Tyneside General HospitalNorth ShieldsTyne and Wear NE29 8NHUnited Kingdom

The natural history of Barrett's esophagus (Be) is difficult to quantify because,by definition,it should describe the course of the condition if left ***,we assume that patients with Be will receive symptomatic treatment with acid suppression,usually a proton pump inhibitor,to treat their *** paper describes the development of complications of stricture,ulcer,dysplasia and adenocarcinoma from this *** over the definition of Be and its implications in clinical practice are *** presence of intestinal metaplasia and its relevance to cancer risk is discussed,and the need to measure the extent of the Barrett's epithelium (long and short segments) using the Prague guidelines is *** and international consensus over the diagnosis and management of Be are being regularly *** need for expert consensus is important due to the lack of randomized trials in this *** searching the literature,we have tried to collate the important studies regarding progression of Barrett's to dysplasia and *** therapeutic studies yet reported show a clear reduction in the development of cancer in *** effect of pharmacological and surgical intervention on the natural history of Barrett's is a subject of ongoing research,including the Barrett's Oesophagus Surveillance Study and the aspirin and esomeprazole cancer chemoprevention trial with interesting *** geographical variation and the wide range of outcomes highlight the difficulty of providing an individualized risk profile to patients with *** studies on the interaction of genome wide abnormalities in Barrett's and their interaction with environmental factors may allow individualization of the risk of cancer developing in Be.

关键词： Barrett's esophagus Columnar lined esoph-agus Dysplasia Adenocarcinoma Gastroesophagealreflux Surgery

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Novel photoactive material and fabrication techniques for solar cells application:nanocellulose-based graphene oxide CdS composite

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Clean energy 2024年第2期8卷 189-216页

作者： Hassan Oriyomi Shoyiga stephen Okiemute Akpasi Joseph Akpan Ubani Oluwaseun Amune Sammy lewis Kiambi Chemistry Department North-West UniversityMafikengSouth Africa Material Science Innovation and Modelling(MaSIM)Research Focus Area Faculty of Natural and Agricultural SciencesNorth-West University(Mafikeng Campus)MmabathoSouth Africa Green engineering Research Group Chemical Engineering DepartmentDurban University of TechnologyDurbanSouth Africa Industrial engineering Department Durban University of TechnologyDurbanSouth Africa Chemical engineering Department Edo State UniversityUzairueNigeria Chemical engineering Department Vaal University of TechnologyVanderbijlparkSouth Africa

In recent times,solar energy has become one of the largest available sources of renewable energy at our ***,the design of highly efficient solar cells is increasingly becoming crucial as there has been a surge for economically viable alternative energy sources with the lowest *** advances have been made through different routes to make photovoltaic(PV)/solar technologies economically viable,eco-friendly and consequently *** a result,cellulose nanomaterials have become one of the emerging technologies in this regard because of the advantages of high-value bio-based nanostructured materials,such as their abundance and ***-based photoactive nanocomposite materials can be made by integrating conducting photoactive and electroconductive materials with hydrophilic biocompatible *** nanoparticles,such as graphene/reduced graphene oxide cadmium sulphide quantum dots,amongst others,can be introduced into the nanocellulose matrix and can be applied either as charge transporters or photoactive materials in different types of solar ***,in this review,we highlight the optoelectronic properties of different photoactive materials,particularly nanocellulose-based graphene nanocomposites;their efficiencies and drawbacks were *** effect of doping each PV material on the PV performance is also *** is anticipated that the novel material would result in a reduction in the cost of solar cells,jointly enhancing their efficacy in generating environmentally friendly *** the fabrication techniques and equipment play a crucial role in the development of solar cells,the fabrication techniques of bulk-heterojunction(BHJ)cells containing a nanocellulose-based graphene composite and case studies of already fabricated BHJ PV cells with nanocellulose-based graphene composite are discussed.

关键词： nanocellulose-based composite bulk heterojunction graphene composite photoactive materials fabrication techniques solar energy power conversion efficiency

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NeCAB family of neuronal calcium-binding proteins in health and disease

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Neural Regeneration Research 2025年第5期20卷 1236-1243页

作者： Diones Bueno Michael K.e.Schafer Sudena Wang Michael J.Schmeisser Axel Methner Institute for Molecular Medicine University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Department of Anesthesiology University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Institute of Anatomy University Medical Center of the Johannes Gutenberg-UniversityMainzGermany

The N-terminal eF-hand calcium-binding proteins 1–3(NeCAB1–3) constitute a family of predominantly neuronal proteins characterized by the presence of at least one eF-hand calcium-binding domain and a functionally less well characterized C-terminal antibiotic biosynthesis monooxygenase domain. All three family members were initially discovered due to their interactions with other proteins. NeCAB1 associates with synaptotagmin-1, a critical neuronal protein involved in membrane trafficking and synaptic vesicle exocytosis. NeCAB2 interacts with predominantly striatal G-protein-coupled receptors, while NeCAB3 partners with amyloid-β A4 precursor protein-binding family A members 2 and 3, key regulators of amyloid-β production. This demonstrates the capacity of the family for interactions with various classes of proteins. NeCAB proteins exhibit distinct subcellular localizations: NeCAB1 is found in the nucleus and cytosol, NeCAB2 resides in endosomes and the plasma membrane, and NeCAB3 is present in the endoplasmic reticulum and Golgi apparatus. The antibiotic biosynthesis monooxygenase domain, an evolutionarily ancient component, is akin to atypical heme oxygenases in prokaryotes but is not wellcharacterized in vertebrates. Prokaryotic antibiotic biosynthesis monooxygenase domains typically form dimers, suggesting that calcium-mediated conformational changes in NeCAB proteins may induce antibiotic biosynthesis monooxygenase domain dimerization, potentially activating some enzymatic properties. However, the substrate for this enzymatic activity remains uncertain. Alternatively, calcium-mediated conformational changes might influence protein interactions or the subcellular localization of NeCAB proteins by controlling the availability of protein–protein interaction domains situated between the eF hands and the antibiotic biosynthesis monooxygenase domain. This review summarizes what is known about genomic organization, tissue expression, intracellular localization, interac

关键词： calcium eF hand mitochondria nervous system signal transduction

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Quantum-continuum simulation of underpotential deposition at electrified metal–solution interfaces

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npj Computational Materials 2017年第1期3卷 470-476页

作者： stephen e.Weitzner Ismaila Dabo Department of Materials Science and engineering Materials Research Instituteand Penn State Institutes of Energy and the EnvironmentThe Pennsylvania State UniversityUniversity ParkPA 16802USA

The underpotential deposition of transition metal ions is a critical step in many electrosynthetic *** underpotential deposition has been intensively studied at the atomic level,first-principles calculations in vacuum can strongly underestimate the stability of underpotentially deposited *** has been shown recently that the consideration of co-adsorbed anions can deliver more reliable descriptions of underpotential deposition reactions;however,the influence of additional key environmental factors such as the electrification of the interface under applied voltage and the activities of the ions in solution have yet to be *** this work,copper underpotential deposition on gold is studied under realistic electrochemical conditions using a quantum-continuum model of the electrochemical *** report here on the influence of surface electrification,concentration effects,and anion co-adsorption on the stability of the copper underpotential deposition layer on the gold(100)surface.

关键词： potential copper electrochemical

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Giant thermoelectric power factor in charged ferroelectric domain walls of GeTe with Van Hove singularities

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npj Computational Materials 2020年第1期6卷 19-26页

作者： Ðorđe Dangić stephen Fahy Ivana Savić Department of Physics University College CorkCollege RoadCork T12 K8AFIreland Tyndall National Institute Dyke ParadeCork T12 R5CPIreland

Increasing the Seebeck coefficient S in thermoelectric materials usually drastically decreases the electrical conductivity σ,making significant enhancement of the thermoelectric power factor σS^(2) extremelly *** we predict,using first-principles calculations,that the extraordinary properties of charged ferroelectric domain walls(DWs)in GeTe enable a five-fold increase ofσS^(2) in the DW plane compared to *** key reasons for this enhancement are the confinement of free charge carriers at the DWs and Van Hove singularities in the DW electronic band structure near the Fermi level.

关键词： ferroelectric walls extreme

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Simpler Mass Production of Polymeric Visual Decoys for the Male emerald Ash Borer （Agrilusplanipennis）

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Journal of Bionic engineering 2015年第2期12卷 263-269页

作者： Tarun Gupta stephen e. Swiontek Akhlesh Lakhtakia Department of lndustrial and Manufacturing engineering Western Michigan University Kalamazoo Michigan 49008 USA Department of engineering Seience & Mechanics Pennsylvania State University Univelitv Park Pennwlvania 16802 USA

Polymeric visual decoys of beetle of an invasive species called the emerald Ash Borer （eAB）, Agrilus planipennis, are highly efficacious in luring and trapping eAB males. Although industrially scalable, the bioreplication process to t）tbricate these decoys involves several operational steps. In a simpler bioreplication process devised by us, a multi-cavity negative die of nickel is made from an array of several eAB females. This die is used to fabricate multiple decoys simultaneously by casting and ihermal curing of poly（dimethyl siloxane）. Finally, the decoys are sprayed by first a black paint and then a metallic green paint. The new bioreplication process has considerably fewer operational steps than its predecessor and can be adopted by industry.

关键词： artificial visual decoy bioreplication Confomlal-evaporated-Film-by-Rotation (CeFR) method electroforming,emerald Ash Borer negative die

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The origin of the lattice thermal conductivity enhancement at the ferroelectric phase transition in GeTe

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npj Computational Materials 2021年第1期7卷 529-536页

作者： Đorđe Dangić Olle Hellman stephen Fahy Ivana Savić Department of Physics University College CorkCorkIreland Tyndall National Institute CorkIreland Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköpingSweden

The proximity to structural phase transitions in IV-VI thermoelectric materials is one of the main reasons for their large phonon anharmonicity and intrinsically low lattice thermal conductivityκ.However,theκof GeTe increases at the ferroelectric phase transition near 700 *** first-principles calculations with the temperature dependent effective potential method,we show that this rise inκis the consequence of negative thermal expansion in the rhombohedral phase and increase in the phonon lifetimes in the high-symmetry *** anharmonicity near the phase transition induces non-Lorentzian shapes of the phonon power *** account for these effects,we implement a method of calculatingκbased on the Green-Kubo approach and find that the Boltzmann transport equation underestimatesκnear the phase *** findings elucidate the influence of structural phase transitions onκand provide guidance for design of better thermoelectric materials.

关键词： phase transition ferroelectric

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