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Methane and nitrous oxide emissions from a subtropical coastal embayment(Moreton Bay, Australia)

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Journal of Environmental sciences 2015年第3期27卷 82-96页

作者： Ronald s.Musenze Ursula Werner Alistair Grinham James Udy Zhiguo Yuan Advanced Water Management Centre (AWMC) The University of Queensland Department of Civil and Environmental Engineering College of Engineering Design Arts and Technology Makerere University school of Civil Engineering The University of Queensland Healthy Waterways Ltd.

surface water methane （CH4） and nitrous oxide （N20） concentrations and fluxes were investigated in two subtropical coastal embayments （Bramble Bay and Deception Bay, which are part of the greater Moreton Bay, Australia）. Measurements were done at 23 stations in seven campaigns covering different seasons during 2010-2012. Water-air fluxes were estimated using the Thin Boundary Layer approach with a combination of wind and currents-based models for the estimation of the gas transfer velocities. The two bays were strong sources of both CH4 and N2O with no significant differences in the degree of saturation of both gases between them during all measurement campaigns. Both CH4 and N2O concentrations had strong temporal but minimal spatial variability in both bays. During the seven seasons, CH4 varied between 500% and 4000% saturation while N2O varied between 128 and 255% in the two bays. Average seasonal CH4 fluxes for the two bays varied between 0.5 ± 0.2 and 6.0 ± 1.5 mg CH4/（m^***） while N20 varied between 0.4 ± 0.1 and 1.6 ± 0.6 mg N2O/（m^2-day）. Weighted emissions （t CO2-e） were 63%-90% N2O dominated implying that a reduction in N2O inputs and/or nitrogen availability in the bays may significantly reduce the bays＇ greenhouse gas （GHG） budget. Emissions data for tropical and subtropical systems is still scarce. This work found subtropical bays to be significant aquatic sources of both CH4 and N2O and puts the estimated fluxes into the global context with measurements done from other climatic regions.

关键词： Greenhouse gas emissions subtropical aquatic systems Bay Methane Nitrous oxide Uncertainty

Convective heat and mass transfer effects in three-dimensional flow of Maxwell fluid over a stretching surface with heat source

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Journal of Central south University 2015年第2期22卷 717-726页

作者： T.Hayat M.Bilal Ashraf A.Alsaedi s.A.shehzad Department of Mathematics Quaid-i-Azam University 45320Islamabad 44000 Pakistan Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Department of MathematicsFaculty of Science King Abdulaziz University P.O.Box 80257 Jeddah 21589 Saudi Arabia

Heat and mass transfer effects in three-dimensional flow of Maxwell fluid over a stretching surface were *** was performed in the presence of internal heat generation/absorption. Concentration and thermal buoyancy effects were accounted. Convective boundary conditions for heat and mass transfer analysis were explored. series solutions of the resulting problem were developed. Effects of mixed convection, internal heat generation/absorption parameter and Biot numbers on the dimensionless velocity, temperature and concentration distributions were illustrated graphically. Numerical values of local Nusselt and sherwood numbers were obtained and analyzed for all the physical parameters. It is found that both thermal and concentration boundary layer thicknesses are decreasing functions of stretching ratio. Variations of mixed convection parameter and concentration buoyancy parameter on the velocity profiles and associated boundary layer thicknesses are enhanced. Velocity profiles and temperature increase in the case of internal heat generation while they reduce for heat absorption. Heat transfer Biot number increases the thermal boundary layer thickness and temperature. Also concentration and its associated boundary layer are enhanced with an increase in mass transfer Biot number. The local Nusselt and sherwood numbers have quite similar behaviors for increasing values of mixed convection parameter, concentration buoyancy parameter and Deborah number.

关键词： Maxwell fluid mixed convection convective conditions three-dimensional flow internal heat generation/absorption

Integrated waste and water management in mining and metallurgical industries

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中国有色金属学会会刊：英文版 2008年第6期18卷 1497-1505页

作者： B.K.C.CHAN s.BOUZALAKOs A.W.L.DUDENEY Department of Earth science and Engineering Imperial College Centre for Innovation in Carbon Capture and storage(CICCs) University of Nottingham

引得出的操作通常共同生产不能出售的材料(矿物质浪费) 的大数量。增强的费用和世界范围的规定为如此的浪费的减小和复用加亮增加的需要。现在的纸为固体和水介绍一个新综合浪费管理计划。计划被连接到硫醚筹款集中的金属处理的 biohydr... 详细信息

引得出的操作通常共同生产不能出售的材料(矿物质浪费) 的大数量。增强的费用和世界范围的规定为如此的浪费的减小和复用加亮增加的需要。现在的纸为固体和水介绍一个新综合浪费管理计划。计划被连接到硫醚筹款集中的金属处理的 biohydrometallurgical 的合成废物和过程水的新奇处理例示。硫醚的 Bioleaching 专注导致稳固的废物的二种类型：ferrihydrite/gypsum 从 bioleach 白酒和未沥滤的脉石的中立状态猛抛。纸显示那，依赖部件包含了的未成年者，在混合的稳固的阶段可能有用地在产品的三种类型之中被散布：常规地下的装填， cemented 土木工程装填(特别地控制的低力量材料或 CLsM ) 和生产土壤。包含模仿的矿物质废物强调 CLsM，证明如此的材料能展出力量，孔和渗透的要求的特征。什么时候有毒的部件，例如，从倔强的金矿石的砷，是在场的，封装将被要求。过程水典型地被再循环远及可能，尽管任何过量以前应该被对待，再使用或排出。纸也由反向的渗透(能通常移开溶解部件的很少方法之一) 加亮处理，特别地在氧化状态 +6 显示出那砷能乐意地为分泌物被移开(<

关键词：置换沉淀废物处理生物浸取金矿

Magnetization dynamics of mixed Co–Au chains on Cu(110) substrate:Combined ab initio and kinetic Monte Carlo study

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Chinese Physics B 2015年第9期24卷 474-478页

作者： K.M.Tsysar s.V.Kolesnikov A.M.saletsky Faculty of Physics Lomonosov Moscow State University

We present an investigation of the one-dimensional ferromagnetism in Au–Co nanowires deposited on the Cu（110）surface. By using the density functional theory, the influence of the nonmagnetic copper substrate Cu（110） on the magnetic properties of the bimetallic Au–Co nanowires is studied. The results show the emergence of magnetic anisotropy in the supported Au–Co nanowires. The magnetic anisotropy energy has the same order of magnitude as the exchange interaction energy between Co atoms in the wire. Our electronic structure calculation reveals the emergence of new hybridized bands between Au and Co atoms and surface Cu atoms. The Curie temperature of the Au–Co wires is calculated by means of kinetic Monte Carlo simulation. The strong size effect of the Curie temperature is demonstrated.

关键词： magnetic properties nanowires density functional theory kinetic Monte Carlo simulation

Magnetic Islands Observed by a Fast-Framing Tangentially Viewing soft X-Ray Camera on LHD and TEXTOR

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Plasma science and Technology 2006年第1期8卷 45-49页

作者： s. OHDACHI K. TOI G. FUCHs TEXTOR Team National Institute for Fusion science Toki 509-5292 Gifu Japan Institut fiir Plasma physik Forschungszentrum Jfilich GmbH Euratom Association D-52425 Jülich Germany

The formation of magnetic islands within plasmas confined magnetically within the tori has significant influence upon their confinement and stability. To obtain an experimental insight into the formation and dynamics of such island structures we employed a fast framing camera viewing the plasma tangentially in the toroidal direction. The toroidal viewing direction gives the advantage in that the islands are viewed almost tangentially and this greatly facilitates the reconstruction of the local data from the line integrated ones. We discuss an effective method to do inversion. To study the fluctuations seen in the video images we perform a singular value decomposition, and then we use a truncated least square method to infer their pictures in space.

关键词： magnetic island, fluctuation measurement tomography

Electrical Conductivity and sensitive Characteristics of Ag-Added BaTiO_3-CuO Mixed Oxide for CO_2 Gas sensing

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Journal of Materials science & Technology 2011年第1期27卷 35-40页

作者： A.M.El-sayed F.M.Ismail s.M.Yakout Inorganic Chemistry Department National Research CentreTahrir StreetDokki P.C.12622 CairoEgypt

Carbon dioxide gas sensors based on BaTiO3-CuO composite with different concentrations of Ag addition（1,1.5 and 2 wt%） have been prepared by stander ceramic method and sintered at 500 and 700℃ for 5 *** conductivity and gas sensing properties of the prepared samples were *** conductivity measurement was used to characterize the obtained sintered sensor *** was found that electrical conductivity and the sensitivity to CO2 were improved with Ag addition and *** correlation between Ag content at different sintering temperature and sensing characteristics towards CO2 is discussed.

关键词： BaTiO3-CuO composite Ag addition Electrical conductivity CO2 sensitive properties

Fine mapping and identification of candidate genes for the peach powdery mildew resistance gene Vr3

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Horticulture Research 2020年第1期7卷 343-351页

作者： Neus Marimon Jordi Luque Pere Arús Iban Eduardo Centre for Research in Agricultural Genomics(CRAG)CsIC-IRTA-UAB-UB Campus UAB08193 BellaterraBarcelonaSpain IRTA(Institut de Recerca i Tecnologia Agroalimentàries) BarcelonaSpain Plant Pathology IRTA CabrilsCarretera de Cabrils km 208348 CabrilsSpain

Powdery mildew is one of the major diseases of peach(Prunus persica),caused by the ascomycete Podosphaera ***,it is controlled through calendar-based fungicide treatments starting at petal fall,but an alternative is to develop resistant peach *** studies mapped a resistance gene(Vr3)in interspecific populations between almond(‘Texas’)and peach(‘Earlygold’).To obtain molecular markers highly linked to Vr3 and to reduce the number of candidate genes,we fine-mapped Vr3 to a genomic region of 270 kb with 27 annotated *** find evidence supporting one of these positional candidate genes as being responsible of Vr3,we analyzed the polymorphisms of the resequences of both parents and used near-isogenic lines(NILs)for expression analysis of the positional candidate genes in symptomatic or asymptomatic *** differentially expressed between resistant and susceptible individuals were annotated as a Disease Resistance Protein RGA2(Prupe2G111700)or an Eceriferum 1 protein involved in epicuticular wax biosynthesis(Prupe2G112800).Only Prupe2G111700 contained a variant predicted to have a disruptive effect on the encoded protein,and was overexpressed in both heterozygous and homozygous individuals containing the Vr3 almond allele,compared with susceptible *** information was also useful to identify and validate molecular markers tightly linked and flanking *** addition,the NILs used in this work will facilitate the introgression of this gene into peach elite materials,alone or pyramided with other known resistance genes such as peach powdery mildew resistance gene Vr2.

关键词： resistance peach mapping

Analysis of monitored ground support and rock mass response in a longwall tailgate entry

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International Journal of Mining science and Technology 2018年第1期28卷 43-51页

作者： G.s.Esterhuizen D.F.Gearhart I.B.Tulu NIOsH Pittsburgh Mining Research Division PittsburghPA 15236USA West Virginia University MorgantownWV 26506USA

A comprehensive monitoring program was conducted to measure the rock mass displacements, support response, and stress changes at a longwall tailgate entry in West *** was initiated a few days after development of the gateroad entries and continued during passage of the longwall panels on both sides of the *** included overcore stress measurements of the initial stress within the rock mass, changes in cable bolt loading, standing support pressure, roof deformation, rib deformation,stress changes in the coal pillar, and changes in the full three-dimensional stress tensor within the rock mass at six locations around the monitoring *** the passage of the first longwall, stress measurements in the rock and coal detected minor changes in loading while minor changes were detected in roof *** a result of the relatively favorable stress and geological conditions, the support systems did not experience severe loading or rock deformation until the second panel approached within 10–15 m of the instrumented *** reaching the peak loading at about 50–75 mm of roof sag, the cable bolts started to unload, and load was transferred to the standing *** standing support system was able to maintain an adequate opening inby the shields to provide ventilation to the first crosscut inby the face, as *** results were used to calibrate modeled cable bolt response to field data, and to validate numerical modeling procedures that have been developed to evaluate entry support *** is concluded that the support system was more than adequate to control the roof of the tailgate up to the longwall face *** monitoring results have provided valuable data for the development and validation of support design strategies for longwall tailgate entries.

关键词： Longwall mining support Tailgate Monitoring Coal mining

Dynamic modeling of twin roll casting AZ41 magnesium alloy during hot compression processing

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Transactions of Nonferrous Metals society of China 2010年第B07期20卷 513-518页

作者：王敏王守仁 s.BKANG J.H.CHO 王砚军 school of Materials science and Engineering Shandong University school of Mechanical Engineering University of Jinan Korea Institute of Materials science 66 Sangnam-dong

A dynamic material model of Mg-4.51Al-1.19Zn-0.5Mn-0.5Ca(AZ41,mass fraction,%)magnesium alloy was put *** results show that the dynamic material model can characterize the deformation behavior and microstructure evolution and describe the relations among flow stress,strain,strain rates and deformation *** analysis shows the validity of the proposed *** model predicts that lower deformation temperature and higher strain rate cause the sharp strain hardening. Meanwhile,the flow stress curve turns into a steady state at high temperature and lower strain *** moderate temperature of 350 ℃and strain rate of 0.01 s-1 are appropriate to this alloy.

关键词： AZ41 alloy flow stress deformation behavior dynamic model twin-roll casting hot compression