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One-Dimensional Nonlinear Laplacians under a 3-Point Boundary Condition

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Acta Mathematica Sinica,English Series 2010年第9期26卷 1641-1652页

作者： Bruce D.calvert Department of Mathematics University of Auckland

We consider a three-point boundary value problem for operators such as the one-dimensional p-Laplacian, and show when they have solutions or not, and how many. The inverse operators are given by various formulas involving zeros of a real-valued function. They are shown to be orderpreserving, for some parameter values, and non-singleton valued for others. The operators are shown to be m-dissipative in the space of continuous functions.

关键词： Boundary value problems nonlinear o.d.e.s p-Laplacian three-point boundary value problem m-dissipative

Metastable noble gas atoms in strong-field ionization experiments

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High Power Laser Science and Engineering 2016年第3期4卷 74-100页

作者： J.E.calvert A.J.Palmer I.V.Litvinyuk R.T.Sang Australian Attosecond Science Facility Center for Quantum Dynamics School of Natural Sciences Griffith University

The interactions of strong-field few-cycle laser pulses with metastable states of noble gas atoms are examined. Metastable noble gas atoms offer a combination of low ionization potential and a relatively simple atomic structure, making them excellent targets for examining ionization dynamics in varying experimental conditions. A review of the current work performed on metastable noble gas atoms is presented.

关键词： COLTRIMS electron holography high power lasers ionization regime metastable atoms spin polarized targets

Concept development and testing of the UK’s first hydrogenhybrid train(HydroFLEX)

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Railway Engineering Science 2021年第3期29卷 248-257页

作者： Charles calvert Jeff Allan Peter Amor Stuart Hillmansen Clive Roberts Paul Weston Birmingham Centre for Railway Research and Education School of EngineeringUniversity of BirminghamEdgbastonBirmingham B152TTUK Jeff Vehicles Ltd BeavercreekUSA

In October 2018,Porterbrook and the University of Birmingham announced the HydroFLEX project,to demonstrate a hydrogen-hybrid modified train atRail Live *** concept of modifying a Class 319 Electric Multiple Unit was developed,with equipment including a fuel cell stack,traction battery,24 V control system and hydrogen storage elements to be mounted inside one of the *** was followed by procurement of a fuel cell stack,traction batteries,and control equipment,which was then installed inside the train,being fixed to the seat *** substantial change from the concept was the provision of considerably more hydrogen storage than the minimum necessary,providing the train with more potential to be further modified to allow for higher speed mainline *** the Rail Live exhibition where HydroFLEX was demonstrated,numerous modifications were performed to increase the reliability and power of the HydroFLEX train,primarily concerned with modifying the base train logic,with the aim of a successfulmainline *** this effort was a multitude of documentation concerning safety,operations,and approvals to gain approvals from the relevant approvals *** project demonstrated the feasibility of using hydrogen fuel cells as an autonomous fuel for railway propulsion systems,which has the potential for full decarbonisation.

关键词： Hydrogen Fuel cell Hybrid Systems engineering

Extractability and Mobility of Copper and Zinc Accumulated in Sandy Soils

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Pedosphere 2006年第1期16卷 43-49页

作者： ZHANG Ming-Kui HE Zhen-Li D. V. calvert P. J. STOFFELLA Department of Natural Resource Sciences College of Natural Resource and Environmental Sciences Zhejiang UniversityHuajiachi Campus Hangzhou 310029 （China）. University of Florida Institute of Food and Agricultural Sciences Indian River Research and Education Center Fort Pierce FL 34945-3138 （USA）

Extractability and mobility of Cu and Zn and their relationships with 1) accumulation of Cu and Zn and 2) soil pH were studied in three sandy soils (Wabasso, Ankona, and Winder) from commercial citrus groves in Florida, USA. The soils, with a broad range of Cu and Zn concentrations, were fractionated by a modified procedure of Amacher, while Cu and Zn mobility were evaluated using column leaching. The extractability of Cu and Zn increased with decreasing soil pH. Also with increasing total soil Cu and Zn for extractable Cu in the Wabasso sand a threshold level, where the metal extraction rate increased, was noted at 100 mg kg-1, whereas for extractable Zn in the Wabasso sand the threshold level was found at 60 mg kg-1 and in the Ankona sand at 120 mg kg-1. These results suggested that the release potential of Cu and Zn was greater in the Wabasso sand than in the Ankona sand. The column leaching experiment showed that at total soil Cu or Zn concentrations 200 mg kg-1 for Cu and > 150 mg kg-1 for Zn with decreasing soil pH, the concentrations of both Cu and Zn in the leachates increased exponentially. Also in these sandy soils soluble Cu and Zn mainly originated from the exchangeable fractions, and pH was a key factor controlling Cu and Zn extractability and mobility.

关键词： copper extractability mobility water quality zinc

Capacity drop through reaction times in heterogeneous traffic

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Journal of Traffic and Transportation Engineering(English Edition) 2018年第2期5卷 96-104页

作者： Simeon C.calvert Femke L.M.van Wageningen-Kessels Serge P.Hoogendoorn Department of Transport & Planning Delft University of Technology

The capacity drop forms a major reason why the prevention of congestion is targeted by traffic management, as lower capacities are detrimental to traffic throughput. Various reasons describing the dynamics behind the capacity have been described, however one of these, reaction times, has had less explicit attention when modelling on a macroscopic flow level. In this contribution, a method to include the effect of reaction times for the capacity drop in heterogeneous traffic is proposed. The applied method further overcomes difficulties in including reaction times in a discrete time model through relaxation of the updating process in the discretization. This approach is novel for application in the considered first order approach, which is practise ready, contrary to many other models that propose similar approaches. The combination of the introduced method and the model form a solid development and method to apply the capacity drop based on this causation of the capacity drop. The results of the experiment case showed that the influence of traffic heterogeneity had a limited effect on the severity of the capacity drop, while it did influence the time of congestion onset. The influence of the reaction time on traffic showed greater capacity drop values for greater reaction time settings. The findings showed the method effective and valid, while the model application is also practise ready.

关键词： Capacity drop Traffic modelling Heterogeneous traffic Traffic flowi

Troubleshooting and Optimization of High-Strength Inhibitory Chemical Wastewater Treatment Process

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Chinese Journal of Chemical Engineering 2005年第6期13卷 800-808页

作者：严月根 calvert C.Churn 何光辉郑巧庚 Philip C.Y.Wong Nanjing SembCorp SUIWU Co Ltd Nanjing Chemical Industry Park Nanjing 210047China Eastman Chemical Co. KingsportTNUSA SembCorp Utilities Pte Ltd 60 Admiralty Road West #02-01Singapore 759947

Wastewaters from the chemical industry are usually of high-strength and may contain minor inhibitory and recalcitrant organics that are at times not readily identifiable. This paper describes the experience of a biological waste water treatment plant （WWTP） processing a COD concentration of 43000 mg·L^-1 wastewater from an oxochemical manufacturing plant. Stage improvements of the plant process by dilution of the inhibitory influent using other chemical wastewater streams resulting in a synergistic process effect, and removal of inhibitory organics by phase separation via acidification, effectively achieved process optimization producing a high quality effluent. In particular, the COD removal efficiency of granular sludge based anaerobic reactors increased from 56% to 90%. The final effluent COD decreased from 250mg·L^-1 to 50mg·L^-1, consistently meeting the COD concentration of 100 mg·L^-1 regulatory discharge limit. The success of the process enhancements supports the hypothesis that long-chain quaternary carboxylic acids act as substrate inhibitors in the biological process.

关键词： operational experience waste water treatment plant (WVCTP) granular sludge chemical wastewater inhibitory recalcitrant long-chain quaternary carboxylic acids

Effect of Compost Amendment on Heavy Metals, Nitrogen and Phosphorus in a Peat-Based Container Medium

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Pedosphere 2005年第6期15卷 792-796页

作者： XlA Yi-Ping HE Zhen-Li P. J. STOFFELLA D. V. calvert ZHANG Ming-Kui YANG Xiao-E S. B. WILSON College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 （China）. College of Environmental Science and Natural Resources Zhejiang University Hangzhou 310029 （China） Indian River Research ＆ Education Center IFAS University of Florida Fort Pierce Florida （USA）

A laboratory study was conducted to evaluate the effect of compost amendment on mobility and leaching potential of heavy metals, nitrogen （N） and phosphorus （P） from a peat-based commercial container medium containing 700 g kg^-1 peat, 200 g kg^-1 perlite and 100 g kg^-1 vermiculite at varying amendment rates of compost （0, 0.25, 0.50, 0.75 and 1.00 L L^-1）. Increasing compost amendment significantly and linearly increased the pH （P 〈 0.01）, the total concentrations of organic carbon （P 〈 0.05）, copper （Cu）（P 〈 0.01）, cadmium （ca）（P 〈 0.01）, and lead （Pb）（P 〈 0.01）, and increased the bulk density （P 〈 0.01） of the medium. The electrical conductivity （EC）, and total N and P of the medium increased significantly （P 〈 0.01） and quadratically with increasing compost amendment. The relationship of the C/N ratio of the medium with the compost amendment rate was decreasing, significant （P 〈 0.01） and cubic, while that of the total Zn was increasing, significant （P 〈 0.01） and cubic. Extractable P, NO3-N, and NH4-N increased initially with an increasing compost amendment of up to 0.50 L L^-1 and then decreased with further increasing compost rate. Increasing compost rates resulted in a highly significant （P 〈 0.01） and linear increase in total Cd, Cu, and Pb, and a highly significant （P 〈 0.01） and cubic increase in total Zn in the medium. Increasing compost rates also significantly （P 〈 0.01） increased extractable Cu （linearly） and Zn （quadratically）, but significantly （P 〈 0.01） decreased extractable Pb （linearly）. There was no significant effect of compost amendment on the extractable Cd concentration in the medium. However, with increasing compost rates from 0.25 to 1.00 L L^-1, extractability of P, Cd, Cu, Pb and Zn （extractable concentration as a percent of total） was decreased, indicating that compost amendment could lower the leachability of these elements from the medium.

关键词： compost amendment heavy metals nitrate peat-based medium phosphate

Borland C++ Builder应用开发大全

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Simulation study on copper and zinc release from contaminated sandy soils due to acidification

丛书名：编程与开发系列丛书

1999年

作者：（美）（C.卡尔弗特）Charlie calvert等徐科等译

来源：畅想之星图书光盘版（南... 评论

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畅想之星图书光盘版（南通市图书馆镜像）

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Journal of Forestry Research 2005年第4期16卷 289-292页

作者： ZHANG Ming-kui D.V. calvert College of Natural Resource and Environmental Sciences Zhejiang University Hangzhou 310029 P. R. China Uni. of Florida Institute of Food and Agr. Sciences Indian River Research and Education Center 2199 South Rock Road Fort Pierce FL 34945 USA

Afforestation in sandy soils can cause soil acidification and affect Cu and Zn release. The behaviors of Cu and Zn release from contaminated arable sandy soils were investigated in the laboratory with the methods of simulated acidification of the soils. The results showed that soil acidification could change chemical forms of Cu and Zn in the soils, impel the transformation of Cu and Zn from carbonate associated fractions to exchangeable, organic matter and oxides associated fractions, and thus increase the release potential of Cu and Zn in the soils. The effect of the acidification on Zn leaching was more significant than that of Cu. Water solubility of Cu and Zn in the soils was increased with decreasing pH, and the solubility of Cu and Zn was increased exponentially at pH 3.8-4.5, and 6.2-6.5, respectively.

关键词： Copper Zinc Contaminated sandy soil Acidification Afforestation