检索结果-南通市图书馆

Evaluation of ambient mass spectrometry tools for assessing inherent postharvest pepper quality

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

Horticulture Research 2021年第1期8卷 2252-2259页

作者： Tyler j.mason Harmonie M.Bettenhausen jacqueline M.Chaparro Mark E.Uchanski jessica E.Prenni Department of Horticulture and Landscape Architecture Colorado State UniversityFort CollinsCO 80524USA

Horticulturists are interested in evaluating how cultivar,environment,or production system inputs can affect postharvest *** mass spectrometry approaches enable analysis of minimally processed samples under ambient conditions and offer an attractive high-throughput alternative for assessing quality characteristics in plant ***,we evaluate direct analysis in real time(DART-MS)mass spectrometry and rapid evaporative ionization-mass spectrometry(REIMS)to assess quality characteristics in various pepper(Capsicum annuum L.)***-MS exhibited the ability to discriminate between pod colors and pungency based on chemical fingerprints,while REIMS could distinguish pepper market class(e.g.,bell,lunchbox,and popper).Furthermore,DART-MS analysis resulted in the putative detection of important bioactive compounds in human diet such as vitamin C,p-coumaric acid,and *** results of this study demonstrate the potential for these approaches as accessible and reliable tools for high throughput screening of pepper quality.

关键词： cultivar pepper ambient

利用质疑改进教育信息技术标准化活动：更多关注其范围和原理(英文)

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

华东师范大学学报（自然科学版） 2012年第2期 25-34,41页

作者： T.HOEL j.mason 奥斯陆和阿克什胡斯应用技术学院教育研发中心奥斯陆0130挪威昆士兰科技大学教育学院昆士兰4001澳大利亚

标准化对于开发"学习、教育和培训"(LET)中使用的"信息通信技术"(ICT)有重要意义,但ICT的利益相关者(stakeholders)却往往质疑标准化活动.本文提出,利用这种质疑形式来分析和改进当前的ICT标准化活动.讨论了由各方参与产生ICT标准过程... 详细信息

标准化对于开发"学习、教育和培训"(LET)中使用的"信息通信技术"(ICT)有重要意义,但ICT的利益相关者(stakeholders)却往往质疑标准化活动.本文提出,利用这种质疑形式来分析和改进当前的ICT标准化活动.讨论了由各方参与产生ICT标准过程的模型框架,其中一系列"为什么"的问题(Why questions)起着重要作用.讨论主要围绕两个方面:一是标准及相关事物在发展过程中的管理与核准;二是如何识别LET中的相关问题与可用来解决这些问题的创新技术.给出了两个事例:一个是对"内容共享对象参考模型"(Sharable Content Object Refer-ence Model,SCORM)的质疑,这能帮助理解该模型;特别是对其适用范围(scope)的质疑而使该模型更完善.另一个是对制定"新工作条款"(New Work Items)必要性的质疑,使人们认识到澄清标准中有关技术原理(rationale)的重要性.

关键词：标准管理 ICT标准数字化学习信息系统架构企业框架 ITLET(学习、教育和培训中的信息技术)

在线全文

学校读者我要写书评

暂无评论

国外城市蔓延控制及对我国的启示

经济地理 2011年第5期31卷 748-753页

作者：孙萍唐莹 Robert j.mason 张景奇东北大学文法学院中国辽宁沈阳110819 天普大学地理与城市事务研究系美国费城19122

城市蔓延给城市可持续发展带来了一系列的负面影响,如何控制城市蔓延已经成为许多国家的规划者面临的挑战。采用文献资料法与定性分析法对城市蔓延内涵和产生原因进行归纳总结,从城市蔓延的控制目的、控制方法和控制效率几个方面对国外... 详细信息

城市蔓延给城市可持续发展带来了一系列的负面影响,如何控制城市蔓延已经成为许多国家的规划者面临的挑战。采用文献资料法与定性分析法对城市蔓延内涵和产生原因进行归纳总结,从城市蔓延的控制目的、控制方法和控制效率几个方面对国外城市蔓延控制研究进行了归纳总结与简要评价。总结出国外城市蔓延控制研究对我国城市蔓延控制的启示:我国城市蔓延产生原因与国外有所不同,调控对象也有所差别;应丰富城市蔓延调控的内涵与目标;应运用综合手段对城市蔓延进行控制;要重视调控政策的实施过程。

关键词：城市蔓延蔓延控制启示圈外

中国北方晚第四纪气候变化的沙漠与黄土记录——以光释光年代为基础的直接对比

在线全文

学校读者我要写书评

暂无评论

第四纪研究 2006年第6期26卷 888-894页

作者：鹿化煜周亚利 j.mason T.Stevens 弋双文 j.Swinehart 南京大学地理与海洋科学学院南京210093 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室 Department of Geography University of Wisconsin Madison Oxford Luminescence Research Group Centre for the EnvironmentUniversity of OxfordUK School of Natural Resources IANRUniversity of Nebraska-LincolnLincolnUSA

中国北方有约200×10^4km^2的面积被黄土、沙漠和荒漠戈壁沉积物覆盖，这些地区堆积物的形成变化与第四纪气候变化密切相关。关于中国北方沙漠与黄土记录晚第四纪古气候变化的研究不少，但是，由于受到方法和条件等限制，系统的（高密... 详细信息

中国北方有约200×10^4km^2的面积被黄土、沙漠和荒漠戈壁沉积物覆盖，这些地区堆积物的形成变化与第四纪气候变化密切相关。关于中国北方沙漠与黄土记录晚第四纪古气候变化的研究不少，但是，由于受到方法和条件等限制，系统的（高密度的）和独立的年代学工作比较薄弱，从而使诸多已经发表的关于沙漠-黄土记录的亚轨道时间尺度气候变化的结论受到质疑。文章通过对黄土高原代表性的4个末次冰期以来的黄土剖面以及毛乌素、浑善达克和科尔沁沙地的20多个末次冰期-全新世的沙-砂质古土壤剖面的研究，获得了150多个独立的光释光年龄数据。在此基础上，结合200多个样品的粒度、有机质含量和磁化率数据，重建末次冰期以来中国北方气候变化过程，对比分析沙地与黄土古气候记录的联系。结果表明，中国北方古气候在57．5—52．5kaB．P．相对干旱，41．5—37．3kaB．P．相对湿润，26—22kaB．P．逐渐干旱，22—18kaB．P．极端干旱，15—10kaB．P．干旱，10—8kaB．P．为干旱减弱的时期，8．0—2．4kaB．P．相对湿润，而2．4kaB．P．以来气候为相对干旱。其间，在8．0—2．4kaB．P．的湿润时期有几次干旱事件，而2．4kaB．P．以来气候变化频繁。具有独立年代控制的黄土和沙漠记录表明，中国北方的气候变化对轨道时间尺度的太阳辐射变化有大约3—4ka的滞后。

关键词：中国北方晚第四纪全新世古气候变化沙漠沙地黄土

Impact of patch size on woody tree species richness and abundance in a tropical montane evergreen forest patches of south India

在线全文

学校读者我要写书评

暂无评论

journal of Forestry Research 2018年第6期29卷 1675-1687页

作者： Dharmalingam Mohandass mason j.Campbell Priya Davidar Root and Soil Biology Laboratory Department of BotanyBharathiar UniversityCoimbatoreTaminadu 641046India Centre for Tropical Environmental and Sustainability Science(T.E.S.S.) College of Science and EngineeringJames Cook UniversityCairnsQLD 4870Australia Department of Ecology and Environmental Sciences Pondicherry UniversityKalapetPondicherry 605014India

We examined the effects of forest patch size on woody tree species richness and abundance in tropical montane evergreen forest patches of the Nilgiri region,south India. We sampled woody trees(>1 cm dbh) from 21 forest patches in the upper Nilgiri hills(> 2000 m elevation) and recorded a total of 35,146 individuals of 61 species, 45 genera and 30 families. Species richness and abundance of sapling/shrubs(≥ 1 to jor role in determining the inherent plant community and thus the subsequent ecological processes of forest patches, including their responses to increasing patch area.

关键词： Dispersal mode Forest fragments Shade-tolerance Species–area relationships Western Ghats

From first fibers to mode-division multiplexing(Invited Paper)

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2016年第12期14卷 2-6页

作者： peter j.Winzer Nokia Bell Labs Holmdel NJ 07733 USA

This Review focuses on optical transmission fibers and the high-capacity systems operating thereon. It attempts to combine key lessons learned from the 50-year history of low-loss optical fibers with views on future fiber and systems requirements, discussing likely evolution paths and potential pitfalls in resolving the optical network capacity crunch.

关键词： multiplexing crosstalk likely resolving combine installed learned today coherent deployment

Mass Transport in Nanowire Synthesis:An Overview of Scalable Nanomanufacturing

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2015年第6期31卷 523-532页

作者： Matthew j.Crane peter j.Pauzauskie Department of Chemical Engineering University of WashingtonSeattleWA 98195-1750.USA Department of Materials Science & Engineering Seattle.WA 98195-2120USA Fundamental Computational Science Directorate Pacific Northwest National LaboratoryRichland.WAUSA

The ability to rationally engineer the growth and nanomanufacturing of one-dimensional nanowires in high volumes has the potential to enable applications of nanoscale materials in a diverse range of fields including energy conversion and storage,catalysis,sensing,medicine,and information *** review provides a roadmap for the development of large-scale nanowire *** myriad techniques exist for bench-scale nanowire synthesis,these growth strategies typically fall within two major categories:1) anisotropically-catalyzed growth and 2) confined,template-based ***,comparisons between growth methods with different mass transport pathways have led to confusion in interpreting observations,in particular Gibbs-Thomson *** review mass transport in nanowire synthesis techniques to unify growth models and to allow for direct comparison of observations across different *** addition,we discuss the applicability of nanoscale,Gibbs-Thomson effects on mass transport and provide guidelines for the development of new growth *** explore the scalability of these complex processes with dimensionless numbers and consider the effects of pressure,temperature,and precursor material on nanowire growth.

关键词： Nanowire Mass transport Modeling Scalable growth

Duality for cochain DG algebras

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2013年第1期56卷 79-89页

作者： jφRGENSEN peter School of Mathematics and Statistics Newcastle University

This paper develops a duality theory for connected cochain DG algebras,with particular emphasis on the non-commutative *** of the main items is a dualizing DG module which induces a duality between the derived categories of DG left-modules and DG right-modules with finitely generated *** an application,it is proved that if the canonical module k=A/A≥1 has a semi-free resolution where the cohomological degree of the generators is bounded above,then the same is true for each DG module with finitely generated cohomology.

关键词： balanced dualizing complex Castelnuovo-Mumford regularity Cech DG module derived comple-tion derived torsion DG left-module DG right-module dualizing DG module endomorphism DG algebra Extregularity non-commutative DG algebra

Simulation and calibration of granules using the discrete element method

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第1期12卷 40-43页

作者： peter Müller jürgen Tomas Institute of Process Engineering Mechanical Process EngineeringOtto-von-Guericke University MagdeburgUniversitätsplatz 239106 MagdeburgGermany

The discrete element method （DEM）, developed by Cundall and 5track to solve geomecnamcai problems, is used to simulate the mechanical behavior of granules. According to the DEM, an individ ual granule can be modeled as a realistic mechanical system consisting of primary particles bonded by interaction forces. Cranulometric properties of the model material, zeolite 4A, have been measured to determine their macro properties. To investigate the compression behavior, a compression test was performed using a strength tester on single granules between two pistons. A modeled granule consisting of more than 22,000 primary particles was generated. The micro properties of the modeled granule have been precisely set to allow its macro properties to be equivalent to the macro properties of zeolite 4A granules. To calibrate the mechanical properties, diametrical compression was simulated using two rigid walls stressed at a constant stressing velocity, The force-displacement curve of the modeled granule at compression has been calibrated by the experimental curve of zeolite 4A.

关键词： Discrete element method Material behavior Granulation