检索结果-南通市图书馆

Hyporheic Zone Flow Disruption from Channel Linings： Implications for the Hydrology and Geochemistry of an Urban Stream, St. Louis, Missouri, USA

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2016年第1期27卷 98-109页

作者： elizabeth a.hasenmueller heather k.robinson Department of Earth and Atmospheric Sciences Saint Louis University St. Louis MO 63108 USA

Cement channel linings in an urban stream in St. Louis, Missouri increase event water contributions during flooding, shorten transport times, and magnify geochemical variability on both short and seasonal timescales due to disruption of hyporheic flowpaths. Detailed analyses of water isotopes, major and trace elements, and in situ water quality data for an individual flood event reveal that baseflow contributions rise by 8% only 320 m downstream of the point where this particular channel changes from cement-lined to unlined. However, additional hydrograph separations indicate baseflow contributions are variable and can be much higher（average baseflow increase is 16%）. Stream electrical conductivity（EC） and solute concentrations in the lined reach were up to 25% lower during peak flow than in the unlined channel, indicating a greater event flow fraction. In contrast, during low flow, stream EC and solute concentrations in the lined reach were up to 30% higher due to the restricted inflow of more dilute groundwater. Over longer timescales, EC, solute concentrations, turbidity, and bacterial loads decrease downstream signifying increasing contributions of dilute baseflow. The decreased connectivity of surface waters and groundwaters along the hyporheic zone in lined channels increases the hydrologic and geochemical variability of urban streams.

关键词： stream channel linings hyporheic zone groundwater-surface water interactions,flood hydrograph urban geochemistry urban streams.

Degradation and mineralization of 2-chloro-, 3-chloro- and 4-chlorobiphenyl by a newly characterized natural bacterial strain isolated from an electrical transformer fluid-contaminated soil

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第10期20卷 1250-1257页

作者： Matthew O.Ilori Gary k.robinson Sunday A.Adebusoye Department of Botany and Microbiology University of Lagos Akoka Yaba Lagos Nigeria Department of Biosciences University of kent Canterbury kent CT2 7NJ United kingdom

A bacterium classified as Achromobacter xylosoxidans strain IR08 by phenotypic typing coupled with 16S rRNA gene analysis was isolated from a soil contaminated with electrical transformer ?uid for over sixty years using Aroclor 1221 as an enrichment substrate. The substrate utilization profiles revealed that IR08 could grow on all three monochlorobiphenyls (CBs), 2,4’- and 4,4’-dichlorobiphenyl as well as 2-chlorobenzoate (2-CBA), 3-CBA, 4-CBA, and 2,3-dichlorobenzoate. Unusually, growth was poorly sustaine...

关键词： aerobic degradation chlorobenzoates mineralization monochlorobiphenyls natural strain polychlorinated biphenyls

Geochemistry and zircon SHRIMP U-Pb dating of granitoids from the west segment of the North Qaidam

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2009年第11期52卷 1771-1790页

作者： Joseph L.WOODEN Paul T.robinson Frank k.MAZDAB Chris MATTINSON Department of Earth and Environmental Sciences Stanford University Department of Earth Sciences Dalhousie University

Granitoid intrusives such as Saishitenshan, Tuanyushan, Aolaohe and Sanchagou occur widely in the western segment of North Qaidam. All these bodies trend NW, roughly parallel to the regional structure. Zircon SHRIMP dating for these granites show that they range in age from Ordovician to Permian; 465.4±3.5 Ma for Saishitenshan, 469.7±4.6 Ma and 443.5±3.6 Ma for Tuanyushan, 372.1±2.6 Ma for Aolaohe, and 271.2±1.5 Ma and 259.9±1.2 Ma for Sanchagou. Both the Tuanyshan and Aolaohe plutons record two distinct intrusive events. Geochemically, the early Paleozoic granites have an island arc or active continental margin affinity, and their protolith may have been Mesoproterozoic oceanic crust derived from depleted mantle. The protolith of the late Paleozoic granites may have been Mesoproterozoic lower crust from the root of an island arc with the magmas reflecting a mixture of mantle and crustal material.

关键词： granitoid zircon SHRIMP U-Pb dating North Qaidam

The effect of the CHAMP intervention on fundamental motor skills and outdoor physical activity in preschoolers

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2019年第2期8卷 98-105页

作者： kara k.Palmer katherine M.Chinn Leah E.robinson Child Movement Activity and Developmental Heanlth Laboratory University of Michigan Center for Human Growth and Development University of Michigan

Purpose: Physical activity(PA) and fundamental motor skills are important components of current and future trajectories of health in young children. This study examined the effects of a 5-week motor skill intervention on preschoolers' motor skill competence and their PA behaviors while participating in the motor skill intervention or outdoor free play(recess).Methods: A total of 102 preschoolers served as participants and were part of a motor skill intervention group(n = 64) or a control/outdoor free play group(n = 38). Children's motor skills were assessed before and after the intervention using the Test of Gross Motor Development-3 rd edition. PA during the motor skill intervention and outdoor free play was assessed using accelerometers both immediately before the start(baseline, Week 0 or Week 1) and end(late, Week 5 or Week 6) of the ***: All children significantly improved their motor skills from baseline to late assessment(p kill intervention demonstrated greater rates of change(p kills at the late assessment compared with the control group(p k motor skill intervention was effective at improving preschoolers' motor skills and rates of change in motor skills were higher for children who completed the intervention compared with children in the control group. Preschoolers in the intervention did demonstrate PA changes while par

关键词： Gross motor skills Intervention Motor development: Pediatrics Physical activity

Resolution-enhanced X-ray fluorescence microscopy via deep residual networks

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 1935-1942页

作者： Longlong Wu Seongmin Bak Youngho Shin Yong S.Chu Shinjae Yoo Ian k.robinson Xiaojing Huang Computational Science Initiative Brookhaven National LaboratoryUptonNY 11973USA Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA National Synchrotron Light Source II Brookhaven National LaboratoryUptonNY 11973USA Materials Engineering Research Facility Applied Materials DivisionArgonne National LaboratoryLemontIL 60439USA London Centre for Nanotechnology University College LondonLondon WC1E 6BTUK

Multimodal hard X-ray scanning probe microscopy has been extensively used to study functional materials providing multiple contrast *** instance,combining ptychography with X-ray fluorescence(XRF)microscopy reveals structural and chemical properties *** ptychography can achieve diffraction-limited spatial resolution,the resolution of XRF is limited by the X-ray probe ***,we develop a machine learning(ML)model to overcome this problem by decoupling the impact of the X-ray probe from the XRF *** enhanced spatial resolution was observed for both simulated and experimental XRF data,showing superior performance over the state-of-the-art scanning XRF method with different nano-sized X-ray *** spatial resolutions were also observed for the accompanying XRF tomography *** this probe profile deconvolution with the proposed ML solution to enhance the spatial resolution of XRF microscopy will be broadly applicable across both functional materials and biological imaging with XRF and other related application areas.

关键词： resolution overcome instance

Deep Learning-Based Hookworm Detection in Wireless Capsule Endoscopic Image Using AdaBoost Classifier

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第6期67卷 3045-3055页

作者： k.Lakshminarayanan N.Muthukumaran Y.Harold robinson Vimal Shanmuganathan Seifedine kadry Yunyoung Nam Department of Electronics and Communication Engineering Francis Xavier Engineering CollegeTirunelveli627003India School of Information Technology and Engineering Vellore Institute of TechnologyVellore632014India Department of Information Technology National Engineering CollegeKovilpatti628503India Department of Mathematics and Computer Science Beirut Arab UniversityLebanon Department of Computer Science and Engineering Soonchunhyang UniversityAsanKorea

Hookworm is an illness caused by an internal sponger called a *** from deprived cleanliness in the developing nations,hookworm infection is a primary source of concern for both motherly and baby *** current framework for hookworm detection is composed of hybrid convolutional neural networks;explicitly an edge extraction framework alongside a hookworm classification framework is *** consolidate the cylindrical zones obtained from the edge extraction framework and the trait map acquired into the hookworm scientific categorization framework,pooling layers are *** hookworms display different profiles,widths,and bend *** challenges make it difficult for customized hookworm *** the proposed method,a contourlet change was used with the development of the Hookworm *** this study,standard deviation,skewness,entropy,mean,and vitality were used for separating the highlights of the each *** estimations were found to be *** classifier was utilized to characterize the hookworm *** this paper,the exactness and the territory under bend examination in identifying the hookworm demonstrate its scientific relevance.

关键词： Hookworm bleakness edge include storing convolutional neural network contourlet transformation skewness entropy

A method for assessing nanomaterial dispersion quality based on principal component analysis of particle size distribution data

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2015年第5期13卷 30-38页

作者： R.Tantra C.Oksel k.N.robinson A.Sikora X.Z.Wang T.A.Wilkins National Physical Laboratory Institute of Particle Science and Engineering School of Chemical and Process EngineeringUniversity of Leeds

Seemingly contradictory findings between studies are a major issue in nanoecotoxicological research and have been explained as a result of the lack of comparability between assay methods, with dispersion of nanomaterials being identified as a key factor. Here we show the use of a multivariate method, principal component analysis （PCA）, as a tool in protocol development and categorization of dispersion quality. Results show the significance of particle concentration within a protocol, and its effect on repeatability. Our results suggest that future studies should involve the use of PCA as a powerful data exploration tool to facilitate method development, comparability and integration of data across different laboratories.

关键词： Nanomaterial characterization Principal component analysis Nanotoxicology Dispersion Particle size distribution

The structure of mixed-species bird flocks,and their response to anthropogenic disturbance,with special reference to East Asia

在线全文

学校读者我要写书评

暂无评论

Chinese Birds 2015年第3期6卷 121-131页

作者： Eben Goodale Ping Ding Xiaohu Liu Ari Martínez Xingfeng Si Mitch Walters Scott k.robinson Department of Forestry Guangxi University College of Life Sciences Zhejiang University Wildlife Conservation Society China Program Department of Biology San Francisco State University Department of Biology University of Florida Florida Museum of Natural History University of Florida

Mixed-species flocks of birds are distributed world-wide and can be especially dominant in temperate forests during the non-breeding season and in tropical rainforests *** review from a community ecology perspective what is known about the structure and organization of flocks,emphasizing that flocking species tend to be those particularly vulnerable to predation,and flocks tend to be led by species that are able to act as sources of information about predators for other *** on how flocks respond to fragmentation and land-use intensification continue to accumulate,but the question of whether the flock phenomenon makes species more vulnerable to anthropogenic change remains *** review the literature on flocks in East Asia and demonstrate there is a good foundation of knowledge on which to *** then outline potentially fruitful future directions,focusing on studies that can investigate how dependent species are on each other in flocks,and how such interdependencies might affect avian habitat selection in the different types of human-modified environments of this region.

关键词： Biodiversity crisis Biological networks Community assembly Competition Interspecific communication keystone species Mutualism Pr

Three-dimensional coherent X-ray diffraction imaging via deep convolutional neural networks

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 1592-1599页

作者： Longlong Wu Shinjae Yoo Ana F.Suzana Tadesse A.Assefa Jiecheng Diao Ross J.Harder Wonsuk Cha Ian k.robinson Computational Science Initiative Brookhaven National LaboratoryUptonNYUSA Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNYUSA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator LaboratoryCaliforniaUSA London Centre for Nanotechnology University College LondonLondonUK Advanced Photon Source ArgonneILUSA

As a critical component of coherent X-ray diffraction imaging(CDI),phase retrieval has been extensively applied in X-ray structural science to recover the 3D morphological information inside measured *** meeting all the oversampling requirements of Sayre and Shannon,current phase retrieval approaches still have trouble achieving a unique inversion of experimental data in the presence of ***,we propose to overcome this limitation by incorporating a 3D Machine Learning(ML)model combining(optional)supervised learning with transfer *** trained ML model can rapidly provide an immediate result with high accuracy which could benefit real-time experiments,and the predicted result can be further refined with transfer *** significantly,the proposed ML model can be used without any prior training to learn the missing phases of an image based on minimization of an appropriate‘loss function’*** demonstrate significantly improved performance with experimental Bragg CDI data over traditional iterative phase retrieval algorithms.

关键词： coherent convolution overcome