检索结果-南通市图书馆

A Pt/MnV_(2)O_(6) nanocomposite for the borohydride oxidation reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Energy Chemistry 2021年第4期30卷 428-436页

作者： jadranka Milikic Marta Martins Ana S.Dobrota Gamze bozkurt Gulin S.P.Soylu Ayse b.Yurtcan Natalia V.Skorodumova Igor A.Pasti biljana Sljukic Diogo M.F.santos Faculty of Physical Chemistry University of BelgradeStudentski trg 12-1611158 BelgradeSerbia CeFEMA Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal Project Coordination Implementation and Research Center Erzurum Technical UniversityErzurumTurkey Faculty of Engineering Chemical Engineering DepartmentIstanbul University-Cerrahpasa34320 AvcilarIstanbulTurkey Department of Chemical Engineering Atatürk UniversityErzurumTurkey Department of Materials Science and Engineering School of Industrial Engineering and ManagementKTH-Royal Institute of TechnologyBrinellvägen 2310044 StockholmSweden Department of Physics and Astronomy Uppsala UniversityBox 51675120 UppsalaSweden

Problems associated with carbon support corrosion under operating fuel cell conditions require the identification of alternative supports for platinum-based nanosized *** supported on manganese vanadate(Pt/MnV_(2)O_(6))was prepared by microwave irradiation method and characterized using X-ray diffraction,Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy with energy dispersive spectroscopy,and transmission electron *** borohydride oxidation reaction(bOR)on Pt/MnV_(2)O_(6) was studied in highly alkaline media using voltammetry,chronoamperometry,and electrochemical impedance *** electrocatalytic activity of Pt/MnV_(2)O_(6) was also compared with that of commercial Pt/C(46 wt%Pt)*** apparent activation energy of bOR at Pt/MnV_(2)O_(6) was estimated to be 32 k j mol^(-1) and the order of reaction to be 0.51,indicating that borohydride hydrolysis proceeds in parallel with its ***-term stability of Pt/MnV_(2)O_(6) under bOR typical conditions was observed.A laboratory-scale direct borohydride fuel cell assembled with a Pt/MnV_(2)O_(6) anode reached a specific power of 274 W g^(-1).Experimental results on Pt/MnV_(2)O_(6) were complemented by DFT calculations,which indicated good adherence of Pt to MnV_(2)O_(6),beneficial for electrocatalyst stability.

关键词： borohydride oxidation reaction Platinum-based electrocatalyst Manganese vanadate Density functional theory

Carryover Effect of Imidazolinone Herbicides for Crops Following Rice

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

American journal of Plant Sciences 2014年第8期5卷 1049-1058页

作者： L.O.santos j.j.O.Pinto L.b.Piveta j.A.Noldin L.Galon G.Concenco Plant Health Department Federal University of PelotasCapao do LeaoBrazil ItajaíExperimental Station Santa Catarina State Institution for Agricultural Research and Extension(Epagri)ItajaiBrazil Plant Science Department Federal University of the Southern BorderErechimBrazil Weed Science Embrapa Western AgricultureDouradosBrazil

We aimed with this study to evaluate the effects of residual activity in soil of formulated mixtures of the herbicides imazethapyr + imazapic and imazapyr + imazapic on ryegrass and on rice cultivars, IRGA 424 and bRS Querencia. Two experiments were conducted under greenhouse in randomized blocks design with four replications in split-plot and split-split-plot designs, respectively for the first (E1) and second (E2) experiments. For E1, main plots allocated herbicides (imazethapyr + imazapic and imazapyr + imazapic), and subplots the doses [(0, 0.5, 1.0, 1.5 and 2.0 fold the label dose of imazethapyr + imazapic (1 L·ha-1) and imazapyr + imazapic (140 g·ha-1) plus 0.5% of the adjuvant Dash→)];for E2, sub-subplots allocated rice cultivars (bRS 424 and IRGA Querência). Phytotoxicity, plant height and shoot dry weight (E1 and E2) and plant stand (E2) were evaluated. Results showed that the annual ryegrass and rice cultivars IRGA 424 and bRS Querencia are sensitive to imazethapyr + imazapic and imazapyr + imazapic, serving as bioindicators of its residual activity in soils following Clearfield→rice. Imazapyr + imazapic, applied post-emergence in irrigated rice at doses of 1.0, 1.5 and 2.0× the label dose, present longer residual activity in soil compared to imazethapyr + imazapic for ryegrass and non-Clearfield→rice.

关键词： Clearfield Imidazolinones Soil Persistence Oryza sativa

Global blue carbon accumulation in tidal wetlands increases with climate change

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2021年第9期8卷 145-155页

作者： Faming Wang Christian j.Sanders Isaac R.santos jianwu Tang Mark Schuerch Matthew L.Kirwan Robert E.Kopp Kai Zhu Xiuzhen Li jiacan Yuan Wenzhi Liu Zhian Li Xiaoliang Research Station for Tropical Coastal Ecosystems Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and the CAS Engineering Laboratory for Ecological Restoration of Island and Coastal Ecosystems South China Botanical Garden Chinese Academy of Sciences Center of Plant Ecology Core Botanical Gardens Chinese Academy of Sciences Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) State Key Laboratory of Estuarine and Coastal Research and Institute of Eco-Chongming East China Normal University National Marine Science Centre School of Environment Science and Engineering Southern Cross University Department of Marine Sciences University of Gothenburg Lincoln Centre for Water and Planetary Health School of Geography University of Lincoln Virginia Institute of Marine Science College of William and Mary Department of Earth and Planetary Sciences and Rutgers Institute of Earth Ocean and Atmospheric Sciences Rutgers University Department of Environmental Studies University of California Department of Atmospheric and Oceanic Sciences Fudan University CAS Key Laboratory of Aquatic botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of Sciences

Coastal tidal wetlands produce and accumulate significant amounts of organic carbon(C) that help to mitigate climate change. However, previous data limitations have prevented a robust evaluation of the global rates and mechanisms driving C accumulation. Here, we go beyond recent soil C stock estimates to reveal global tidal wetland C accumulation and predict changes under relative sea level rise, temperature and precipitation. We use data from literature study sites and our new observations spanning wide latitudinal gradients and 20 countries. Globally, tidal wetlands accumulate 53.65(95%CI: 48.52–59.01)Tg C yr-1, which is ～30% of the organic C buried on the ocean floor. Modeling based on current climatic drivers and under projected emissions scenarios revealed a net increase in the global C accumulation by2100. This rapid increase is driven by sea level rise in tidal marshes, and higher temperature and precipitation in mangroves. Countries with large areas of coastal wetlands, like Indonesia and Mexico, are more susceptible to tidal wetland C losses under climate change, while regions such as Australia, brazil, the USA and China will experience a significant C accumulation increase under all projected scenarios.

关键词： coastal wetlands blue C C burial rate global change

High-Pressure Single-Crystal Neutron Scattering Study of Magnetic and Fe Vacancy Orders in （T1,Rb）：Fe4Se5 Superconductor

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第12期31卷 111-114页

作者：叶峰鲍威池松雪 Antonio M. dos santos jamie j. Molaison 方明虎王杭栋毛乾辉汪晋辰刘娟娟盛洁明 Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge 37831 USA Department of Physics and Astronomy University of Kentucky Lexington 40506 USA Department of Physics Renmin University of China Beijing 100872 Department of Physics Zhejiang University Hangzhou 310027

The recently discovered metal-intercalated iron selenide superconductors A2Fe4Se5 （A=K, Cs, T1- K, Rb, T1-Rb）（245） compounds, with Tc ～30K, have attracted much interest A high transition- temperature （TN ≈ 470-560K） and large magnetic moment （3.3μb/Fe） block antiferromagnetic （AFM） order exists in the superconducting samples. Mag- netic order-parameter experiences an anomaly when Tc is approached. The superconductors crystal- lize with a highly ordered √5 × √5 superstructure, in which the Fel site of the I4/m structure is only a few percents occupied and the Fe2 site is fully occupied. The non-superconducting samples at low-T also crystallize in the I4/m structure, while both Fe sites are fractionally occupied, since the numbers of the Fe vacancies in the samples and the vacant sites in the √5 × √5 pattern are mismatched. The partially ordered √5× √5 vacancy order becomes one of three competing phases for temperature below room temperature up to ～ 500K, namely, these sam- ples are phase-separated and in the miscibility gap 1lacier the n,mhi^nt condition.

关键词： High-Pressure Single-Crystal Neutron Scattering Study Vacancy Orders

Historical relationships of areas of endemism of the brazilian Atlantic rain forest： a cladistic biogeographic analysis of harvestman taxa （Arachnida： Opiliones）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2017年第5期63卷 525-535页

作者： Marcio b. DASILVA Ricardo PINTO-DA-ROCHA juan j. MORRONE Departamento de Sistematica e Ecologia CCEN Universidade Federal da Paraiba Cidade Universitaria Joao Pessoa PB Brazil Departamento de Zoologia Instituto de Biociencias Universidade de Sao Paulo Sao Paulo SP Brazil Museo de Zoologia "Alfonso L. Herrera" Departamento de Biologia Evolutiva Facultad de Ciencias Universidad Nacional Autdnoma de Mexice (UNAM) 04510 Mexico City Mexico

based on a cladistic biogeographic analysis of 6 species-level phylogenies of harvestman taxa, wesearched for congruence in the historical relationships of 12 areas of endemism of the brazilianAtlantic Rain Forest. We constructed general area cladograms using Primary brooks ParsimonyAnajysis （bPA）, bPA of nodes, and paralogy-free subtree analysis. These analyses resulted in 6general area cladograms, that allow to infer a general pattern of the relationships among areas ofendemism from the brazilian Atlantic Rain Forest. Northern areas resulted related basally showingmain disjunctions at the Doce River Valley and Todos os santos bay/S^o Francisco River *** remaining areas of endemism were included in a southern and a southeastern block, sepa-rated by the Ribeira do Iguape Valley. Incongruence Length Differences tests showed no significantincongruence among the resulting cladograms and other matrix partitions. We concluded that tec-tonism and ancient marine transgressions were the probable processes responsible for the maindisjunctions, whereas Neogene refugia seem to have caused the more recent disjunctions. Thegeneral pattern and redundancy in area relationships suggest a model of main reiterative barriersin diversification at multiple times for the evolution of the Atlantic Rain Forest. The renewal of cla-distic biogeography and the search for common biogeographic patterns are discussed.

关键词： dispersal, historical biogeography, Mata Atlantica, speciation, vicariance.

Human Centered Design of the Interfaces of a Radiation Monitoring System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Human Centered Design of the Interfaces of a Radiation Monit...

Learning to Reason in Time using Discrete Time backpropagation

第十七届国际工效学大会暨中国人类工效学会成立20周年庆...

作者： Isaac j.A.Luquetti dos santos marcos S.Farias Paulo Victor R.Carvalho Cláudio H.S.Grecco Maurício A.Aghina National Nuclear Energy Commission Nuclear Engineering Institute

Inadequate human-system integration reduces the safety,increases the overall complexity of the system,the time needed to perform tasks,the probability of human errors occurrence and complicates training and maintenance of the *** is imperative to understand and to incorporate the requirements related to the operators,their needs and ability,the current work practices of the operators,the requirements of workplace environment and the organizational aspects of the job into the life cycle of the *** aim is to guarantee the involvement of the users in all phases of the system development,to improve the operational reliability,to design reliable and robust system,so that the task demands can be compatible with human capabilities and *** monitoring systems are critical systems that operate twenty-four hours a day,monitoring the radiation condition in work environments inside a nuclear *** data signals from radiation detectors installed at work site are transmitted to a central control room where radiation levels and alarm activated are operated and monitored on *** this paper is proposed a methodological framework,applied to the design of the human-system interfaces,that includes the analysis of the reference systems,the functional requirements analysis,the functions allocation,the task analysis,the job analysis,the analysis of the work context and the analysis of the users *** case study is based on the development of the interfaces of the radiation monitoring supervisory system to be installed in a research nuclear reactor.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Learning to Reason in Time using Discrete Time Backpropagati...

Literature Review on biorefinery Processes Integrated to the Pulp Industry

1998 International Conference on Neural Networks and brain(ICNN&b’98)

作者： j.santos R.j.Duro Dpto.Computación Universidade da Corua Spain

＜正＞In this work we are going to discuss a new learning algorithm for neural networks where the length of the synapses may be modeled as a synaptic delay *** networks present the ability of learning time related events without resorting to any windowing process as would be the case in other architectures found in the ***, they may be applied to signals or any other kind of time decision related input without any type of temporal *** makes them very interesting for handling problems where it is not clear what the relevant temporal window is or where this window changes with *** other advantage these networks present is that they offer the ability of generalizing in time,that is they respond in a similar fashion to similar time related events. The algorithm developed by our group and discussed here,Discrete Time backpropagation,is shown to be a very efficient algorithm for training both the weights and the values for the lengths of the synapses or delays in order to perform all kinds of time related decision functions,whether they be the detection of patterns in time varying signals or the prediction of future values of time series,such as chaotic series.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Natural Resources 2014年第9期5卷 419-432页

作者： Fernando j.b.Gomes Fernando A.santos jorge L.Colodette Iara F.Demuner Larisse A.R.batalha Department of Forestry Engineering Federal University of VicosaVicosaBrazil

biorefinery is a new term to designate two main subjects, bioproducts and bioenergy, which play important roles towards a more bio-based society. This paper reviews the current biorefineries model as well as its future importance focusing on pulp mill opportunities. There are currently several different levels of integration in biorefineries which add to their sustainability, both economically and environmentally. Enzymatic pretreatment for biomass deconstruction aiming to release the polysaccharides is a key technology in the future biorefineries and it is currently the subject of intensive research.

关键词： Lignocellulosic biomass biorefinery Ethanol

Fern extracts potentiate fluconazole activity and inhibit morphological changes in Candida species

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific journal of Tropical biomedicine 2017年第11期7卷 1025-1030页

作者： Maria A.Freitas Antonia T.L.santos Antonio j.T.Machado Ana Raquel P.Silva Fábia F.Campina Maria S.Costa Gioconda M.A.b.Martins Maria Flaviana b.Morais-braga Saulo R.Tintino Irwin R.A.Menezes jaime Ribeiro-Filho Altevir P.Medeiros Adeliana S.Oliveira Patrício b.Maracajá Henrique D.M.Coutinho Universidade Regional do Cariri-URCA Universidade Federal Rural do Semi-A′rido-UFERSA Universidade Federal do Rio Grande do Norte-UFRN Universidade Federal de Campina Grande-UFCG

Objective: To investigate the antifungal activity of the fern species Lygodium venustum(L. venustum) and Pityrogramma calomelanos(P. calomelanos) against Candida albicans and Candida tropicalis ***: The microdilution method was used to evaluate the antifungal activity, as well as the modulating effects of ethanolic extracts of these plants in combination with fluconazole. The minimum inhibitory concentration(MIC), minimum fungicide concentration and morphological changes were also ***: The extract obtained from L. venustum presented a MIC > 8 192 mg/m L, while the extract obtained from and P. calomelanos presented a MIC = 8 192 mg/m L, indicating that they present weak antifungal activity. However, combination of the extracts with Fluconazole potentiated the antifungal activity of this drug. At different experimental conditions, such as concentration of the extract and type of strain, the extracts inhibited hyphae and pseudohyphae formation, indicating that these fern species can affect the morphology of the ***: The extracts obtained from the fern species L. venustum and P. calomelanos dose not present significant antifungal activity. However, P. calomelanos potentiates the activity of fluconazole and both extracts inhibits the morphological changes in Candida species, indicating that they have potential pharmacological activity as modulators of fungal biology. Therefore, novel studies are required to characterize the interference of these extracts in the virulence and pathogenicity of Candida species as well as the potential of fern species to treat fungal infections.

关键词： Dimorphism Candida species Ferns Lygodium venustum Pityrogramma calomelanos