检索结果-南通市图书馆

Iron Speciation of Mud Breccia from the Dushanzi Mud Volcano in the Xinjiang Uygur Autonomous region,NW China

Acta Geologica Sinica(English Edition) 2018年第6期92卷 2201-2213页

作者： XU Wang ZHENG Guodong MA Xiangxian Danielle FOrTIN david r.hilton LIANG Shouyun CHEN Zhi HU Guoyi Key Laboratory of Petroleum resources Gansu Province/Key Laboratory of Petroleum Resources ResearchInstitute of Geology and GeophysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Earth and Environmental Sciences University of Ottawa25 Templeton St.OttawaOntarioK1N 6N5Canada Scripps Institution of Oceanography University of California San DiegoLa JollaCA 92093-0244USA Key Laboratory of Mechanics on Disaster and Environment in Western China(Lanzhou University) Ministry of EducationLanzhou 730000China CEA Key Laboratory of Earthquake Prediction(Institute of Earthquake Forecasting) China Earthquake AdministrationBeijing 100036China research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China

Organic-inorganic interactions occurring in petroleum-related mud volcanoes can help predict the chemical processes that are responsible for methane emissions to the atmosphere. Seven samples of mud breccia directly ejected from one crater were collected in the Dushanzi mud volcano, along with one argillite sample of the original reddish host rocks distal from the crater, for comparison purposes. The mineral and chemical compositions as well as iron species of all samples were determined using XrD, XrF and M?ssbauer spectroscopy, respectively. The results indicate that a series of marked reactions occurred in the mud volcano systems, more specifically in the mud breccia when compared to the original rocks. Changes mainly included:(1) some conversion of clay minerals from smectite into chlorite and illite, and the precipitation of secondary carbonate minerals such as calcite and siderite;(2) silicon depletion and significant elemental enrichment of iron, manganese, magnesium, calcium and phosphorus; and(3) transformation of iron from ferric species in hematite and smectite into ferrous species in siderite, chlorite and illite. These geochemical reactions likely induced the color changes of the original reddish Neogene argillite to the gray or black mud breccia, as a result of reduction of elements and/or alteration of minerals associated with the oxidation of hydrocarbons. Our results also suggest that greenhouse gases emitted from the mud volcanoes are lowered through a series of methane oxidation reactions and carbon fixation(i.e., through carbonate precipitation).

关键词： mud volcano mud breccias iron species organic-inorganic interactions greenhouse gas

来源：

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

深部地幔中的原始水

引用

矿物岩石地球化学通报 2016年第1期35卷 36-36页

作者： Lydia J.Hallis Gary r.Huss Kazuhide Nagashima G.Jeffrey Taylor Saemundur A.Halldórsson david r.hilton Michael J.Mottl Karen J.Meech 夏群科

地球上水的起源一直困惑着科学家,因为早期太阳的高温足以蒸发掉那些形成原始地球的早期太阳系星云中的冰质尘埃,因此科学家一般倾向于认为新生的地球应该是＂干的＂,后期通过来自太阳系边缘冰质小天体的撞击获得了水。由于不同来源的... 详细信息

地球上水的起源一直困惑着科学家,因为早期太阳的高温足以蒸发掉那些形成原始地球的早期太阳系星云中的冰质尘埃,因此科学家一般倾向于认为新生的地球应该是＂干的＂,后期通过来自太阳系边缘冰质小天体的撞击获得了水。由于不同来源的水具有不同的H同位素组成,因此地球初始的H同位素组成可以用来示踪水的起源,然而由于水在地表和地球深部之间广泛的循环交换,找到能代表原始地幔的储库并不容易。以前的研究表明,

关键词：太阳系星云同位素组成同位素研究包裹体氢同位素示踪幔源内太阳系 island 夏威夷大学

来源：

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

Climate change and contrasting plasticity in timing of a two-step migration episode of an Arctic-nesting avian herbivore

引用

Current Zoology 2014年第2期60卷 233-242页

作者： Anthony david FOX Mitch D.WEEGMAN Stuart BEArHOP GeoffM.hilton Larry GrIFFIN david A.STrOUD Alyn WALSH Department of Bioscience Aarhus University Kalo Grenavej 14 DK-8410 Ronde Denmark Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Cornwall CampusTR10 9EZ UK Wildfowl and Wetlands Trust Slimbridge Gloucester GL2 7BT UK Wildfowl and Wetlands Trust Eastpark Farm Caerlaverock Dumfriesshire DGI 4RS UK Greenland White-fronted Goose Study c/o Spring Meadows Taylors Green Warmington Peterborough PE8 6TG UK National Parks and Wildlife Service Wexford Wildfowl Reserve North Slob Wexford Ireland

Greenland white-fronted geese Anser albifrons flavirostris wintering in Britain and Ireland migrate over the sea for 700-1200 km to stage 3-5 weeks in Iceland in spring, continuing a similar distance over the sea and Greenland Ice Cap to West Greenland breeding grounds. During 1969 to 2012, the geese advanced the mean departure date from Ireland by 15 days, during which time also they attained threshold fat stores earlier as well as departing in fatter condition. Over that period, Iceland spring-staging geese shifted from consuming underground plant storage organs to grazing managed hayfields, which provide fresh grass growth despite sub-zero temperatures, when traditional natural foods are inaccessible in frozen substrates. In 2012 and 2013, geese arrived three weeks earlier to Iceland, in fatter condition and accumulated fat significantly slower than in 1997-1999 and 2007. Although geese accumulated sufficient fat stores earlier in Iceland in 2007, 2012 and 2013, they departed around the same date as in 1997-1999, prolonging spring staging by three weeks. Plasticity in winter departure dates is likely due to improved winter feeding conditions （enabling earlier departure in better condition） and a novel predictable food resource in Iceland. Greenland white-fronted geese attained threshold fat stores in Iceland earlier, but remained rather than departing earlier to Greenland. Despite arriving earlier in Iceland, arrival dates on the breeding areas have not changed since the 1880s, presumably because of relatively constant cool springs and heavy snowfall in West Greenland during recent years [Current Zoology 60 （2）： 233-242, 2014].

关键词： Anser albifronsflavirostris Climate mismatch Greenland white-fronted geese Migration phenology Vernalmigration

来源：

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

Influence of social upbringing on the activity pattern of captive lion Panthera leo cubs:Benefits of behavior enrichment

引用

Current Zoology 2010年第4期56卷 389-394页

作者： Sibonokuhle NCUBE hilton Garikai Taambuka NDAGUrWA African Lion and Environmental research Trust (ALErT) Department of Forest resources and Wildlife Management Faculty of Applied Sciences National University of Science and Technology

The influence of social upbringing on the activity pattern of lion Panthera leo cubs was investigated at three sites. In this study, stimulus objects such as sticks, grass, fresh dung （elephant Loxondota africana, zebra Equus quagga, impala Aepyceros melampus, duiker Sylvicapra grimmia, kudu Tragelaphus strepsiceros, giraffe Giraffa camelopardalis and wildebeest Connochaetes taurinus） and cardboard boxes, were utilized in an enrichment program aimed at encouraging active behaviors of captive lion cubs at Antelope Park and Masuwe. Lion cubs at Chipangali were not behaviorally enriched. Activity patterns were recorded for 10 days at each site. We recorded moving, resting, playing, grooming, visual exploration and display of hunting instincts. We found that behavioral enrichment enhanced the active behaviors of captive lion cubs. Orphan-raised cubs spent more time moving, playing and displaying hunting instincts than mother-raised cubs, but the time spent grooming was similar across areas and suggests that grooming is not influenced by enrichment. Mother-raised cubs spent more time engaged in visual exploration than orphan-raised cubs and this could be a behavior acquired from mothers or a result of confidence to explore because of their presence. Activity patterns were different among time treatments across our three study sites. Based on these findings, we suggest that lion cubs raised in captivity could benefit from behavioral enrichment to encourage active behaviors essential for eventual reintroduction into the wild

关键词： Activity pattern Panthera leo Lion cub Behavioral enrichment Orphan raised Mother raised

来源：

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

The Potential of High Power Lasers for Tube Cutting and Concrete Scabbling in Nuclear Decommissioning

引用

稀有金属材料与工程 2011年第S4期40卷 252-256页

作者： Paul hilton Ali Khan TWI Ltd.Granta Park Cambridge CB21 6ALUK

Contaminated concrete and metal pipework presents a major nuclear decommissioning challenge in terms of the total volumes of material to be treated,the radiation levels present and the number of facilities *** recently,industrial lasers have often been seen as too unreliable for use in nuclear decommissioning environments and hence their usage has been *** advent of solid state 'fibre' lasers has,however,provided a robust and reliable industrial tool,capable of performing not only concrete scabbling but other laser based decommissioning processes,such as *** concrete scabbling has been demonstrated in the laboratory,to date,no representative scale demonstration has been provided which would give industry confidence in the *** paper will describe the development of a laser scabbling process head,equipped with an integrated debris collection device and adaptive control system for automatic maintenance of the attitude and stand off distance of the head from the concrete *** results of using optical fibre delivered laser power to remove the surface of a range of representative and large scale concrete samples will be *** 5kW of laser power,removal rates up to 7000 cc of concrete per hour have been recorded at a removal depth of the order *** paper will also report on the results of using the same laser source,for single-sided cutting of various 304L stainless steel tubes,of diameter up to 170mm and wall thickness up to *** results show that with the right optical configuration,it is entirely possible to laser cut tubes from one side,at extremely long and safe standoff distances,if the main objective is simply to sever the tube.

关键词： lasers concrete scabbling tube cutting.

来源：

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

An efficient framework for ensemble of natural disaster simulations as a service

引用

Geoscience Frontiers 2020年第5期11卷 1859-1873页

作者： Ujjwal KC Saurabh Garg James hilton Discipline of ICT University of TasmaniaHobartAustralia Data61 CSIROMelbourneAustralia

Calculations of risk from natural disasters may require ensembles of hundreds of thousands of simulations to accurately quantify the complex relationships between the outcome of a disaster and its contributing *** large ensembles cannot typically be run on a single computer due to the limited computational resources *** Computing offers an attractive alternative,with an almost unlimited capacity for computation,storage,and network ***,there are no clear mechanisms that define how to implement these complex natural disaster ensembles on the Cloud with minimal time and *** such,this paper proposes a system framework with two phases of cost optimization to run the ensembles as a service over *** cost is minimized through efficient distribution of the simulations among the cost-efficient instances and intelligent choice of the instances based on pricing *** validate the proposed framework using real Cloud environment with real wildfire ensemble scenarios under different user *** experimental results give an edge to the proposed system over the bag-of-task type execution on the Clouds with less cost and better flexibility.

关键词： Wildfire prediction Ensemble simulation Cloud computing Natural disaster models

来源：

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

On the Extended Genus

引用

Acta Mathematica Sinica,English Series 1988年第4期4卷 372-382页

作者： Peter.hilton Department of Mathematical Sciences SUNY Binghamton NY

Ⅰ. Introduction For finitely generated nilpotent groups G, we describe the genus of G as the set of isomorphismclasses of finitely generated nilpotent groups H such that the Iocalizations of G and H are isomorphicat ... 详细信息

关键词： On the Extended Genus

来源：

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

Depositional Model for Peat Swamp and Coal Facies Evolution Using Sedimentology, Coal Macerals, Geochemistry and Sequence Stratigraphy

引用

Journal of Earth Science 2017年第6期28卷 1163-1177页

作者： Jing Lu Longyi Shao Minfang Yang Kai Zhou James r.Wheeley Hao Wang Jason hilton State Key Laboratory of Coal resources and Safety Mining China University of Mining and Technology School of Geography Earth and Environmental Sciences the University of Birmingham Langfang Branch of Petroleum Exploration and Development research Insitute Petro China

As one of the most important source rocks and reservoirs of unconventional natural gas, the sedimentary environment and mode of peat swamp（the predecessor of coal seam） is important to the coal seam＇s spatial distribution, material composition, hydrocarbon generation potential, reservoir physical properties, etc. To reveal the depositional characteristics and history of environmental change in a terrestrial basin during a period of peat accumulation, the Middle Jurassic aged #7 coal from Gaoquan in the Qaidam Basin（NW China） was investigated using sedimentology, maceral composition, geochemistry and sequence stratigraphy. Based on identification of the sedimentary shoreline break belt, wave energy depletion point and position of wave base, the peat swamp system can be subdivided into（1） lakeside plain,（2） low energy lakeshore,（3） high energy lakeshore, and（4） shallow lake subfacies. A new method for determining coal facies is proposed based on the combination of environmental parameters including oxidation-reduction levels, energy conditions and the influence of terrigneous sediments. The evolution of the coal seam shows that peat was deposited mainly in the low energy lakeshore and lakeside plain subfacies. Five types of sequence stratigrpahic surface and two types of parasequence were identified. Forced lake regressions and normal lake regressions are attributed as the causes of sequence boundaries. The sequence stratigraphic framework comprises six sequences and corresponding system tracts, and the curve of base-level for each demonstrates a characteristic initial period of slow rising followed by fast rising and then returning to slow rising. A model indicating the relationship among base-level changes, coal facies evolution, and the environmental features in the swamp is proposed that shows the environmental features of the swamp were controlled by both base-level changes and coal facies. Accompanying depositional environment changes from a lakeside plain to la

关键词： peat swamp sedimentary model coal facies base level coal maceral

来源：

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

Low Power Laser Surfi-Sculpt

引用

稀有金属材料与工程 2011年第S4期40卷 147-150页

作者： J.E.Blackburn P.A.hilton Laser and Sheet Processes Group TWI LtdCambridgeCB21 6ALUnited Kingdom

The functional properties of materials can be enhanced using surface features,for instance;to improve the thermal properties of heat *** development of the laser Surfi-Sculpt process over the past decade has resulted in a technology capable of producing a wide variety of features in metallic ***,the potential for producing similar features in polymeric and ceramic substrates also *** the potential for utilizing high power focused laser beams to produce surface features using this process has been *** paper details the results of recent trials performed with a 200 Yb-fibre laser and a galvanometer driven beam scanner for producing surface features using the Surfi-Sculpt process.A compact,cheap,easily robotically automated,laser Surfi-Sculpt machine,being able to operate at atmospheric pressure may have potential in a range of industry sectors.

关键词： laser surfacing Yb-fibre surfi-sculpt

来源：

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

Adaptively Controlled Hybrid Welding Using a High Brightness Laser

引用

稀有金属材料与工程 2011年第S4期40卷 1-5页

作者： C.M.Allen P.A.hilton TWI Ltd Granta ParkGreat AbingtonCambridgeCB21 6ALUnited Kingdom

Hybrid laser-MAG welding with real-time adaptive control has been *** welding conditions have been developed to produce ISO 13919-1 class B (stringent) quality butt welds between 8mm thickness steel plates,using a 5kW *** Yb fibre laser combined with conventional arc welding equipment.A laser vision seam tracking system has enabled a 7-axis robot,manipulating the hybrid welding head,to track butt joints in real time during *** laser vision system has also provided information on the variations in joint fit-up,in particular the width of any gaps,or height of any mismatches *** information has then been used to automatically adjust the robot position or speed,or arc welding parameters,depending on the fit-up *** this way,the tolerance of the hybrid process has been augmented,producing stringent quality welds over a wider range of joint fit-up cases than when using fixed conditions alone.

关键词： hybrid welding steel adaptive control fit-up tolerance

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：