检索结果-南通市图书馆

使用配备单纳米颗粒应用模块的Agilent 7900 ICP-MS实现单个纳米颗粒的自动化高灵敏度分析

在线全文

学校读者我要写书评

暂无评论

环境化学 2016年第4期35卷 833-835页

作者： Michiko Yamanaka Kazuo Yamanaka Takayuki Itagaki steven wilbur Ed McCurdy 安捷伦科技公司日本安捷伦科技公司美国安捷伦科技公司英国

使用配备ICP-MS Mass Hunter软件专用单纳米颗粒应用模块的Agilent 7900 ICP-MS成功实现了纳米颗粒的测定和表征.集成的数据分析软件能够快速自动化地执行单颗粒分析所需的复杂计算,同时能够在单颗粒模式下对结果进行简单、可视化的优... 详细信息

使用配备ICP-MS Mass Hunter软件专用单纳米颗粒应用模块的Agilent 7900 ICP-MS成功实现了纳米颗粒的测定和表征.集成的数据分析软件能够快速自动化地执行单颗粒分析所需的复杂计算,同时能够在单颗粒模式下对结果进行简单、可视化的优化与验证.sp-ICP-MS方法可同时提供粒径分布与样品浓度信息,这是其他技术通常无法达到的.

关键词：纳米颗粒自动化分析

ICP-MS法测定电子电器材料中的有害元素铅、镉、砷、铬

在线全文

学校读者我要写书评

暂无评论

环境化学 2006年第5期25卷 657-660页

作者：张华王英锋施燕支陈玉红李平 John Lau steven wilbur 首都师范大学分析测试中心安捷伦科技有限公司

建立了电感耦合等离子体质谱测定不同基体的电子电器材料中铅、镉、铬、砷四种有害元素的方法.对仪器的参数、测试稳定性等作了系统研究,优化了对不同基体样品中铅、镉、铬、砷元素分析的前处理条件,探讨了各种材料中基体元素与其它共... 详细信息

建立了电感耦合等离子体质谱测定不同基体的电子电器材料中铅、镉、铬、砷四种有害元素的方法.对仪器的参数、测试稳定性等作了系统研究,优化了对不同基体样品中铅、镉、铬、砷元素分析的前处理条件,探讨了各种材料中基体元素与其它共存元素对待测元素的影响.方法检出限为0.0024—0.46μg.g-1,对标准物质的测定值与参考值相符,相对准偏差为0.6%—5.8%.

关键词：有害元素电器材料质谱测定 ICP-MS法电子电感耦合等离子体铅镉

微波消解-电感耦合等离子体质谱(ICP-MS)法同时测定塑料中的铅、镉、汞、铬、砷

在线全文

学校读者我要写书评

暂无评论

环境化学 2006年第4期25卷 520-523页

作者：陈玉红张华施燕支王英锋李平 John Lau steven wilbur 王海舟安捷伦科技有限公司北京100022 首都师范大学分析测试中心北京100037 国家钢铁材料测试中心北京100081

建立了微波消解-电感耦合等离子体质谱同时测定各种塑料中的铅、镉、汞、铬、砷等元素的方法.对仪器的参数设置、进样系统的选择、测试稳定性等方面进行了系统研究,并对塑料标准样品中上述元素分析的前处理条件如消解体系、酸用量、消... 详细信息

建立了微波消解-电感耦合等离子体质谱同时测定各种塑料中的铅、镉、汞、铬、砷等元素的方法.对仪器的参数设置、进样系统的选择、测试稳定性等方面进行了系统研究,并对塑料标准样品中上述元素分析的前处理条件如消解体系、酸用量、消解温度及时间等进行了优化.方法检出限为0.7—6.5 ng.g-1,加标回收率为89.8%—103.5%,相对标准偏差为0.8%—11.3%.

关键词：电感耦合等离子体质谱(ICP-MS) 微波消解同时测定塑料相对标准偏差铅镉汞铬砷

Friction and wear performance of polyether ether ketone(PEEK)polymers in three lubrication regimes

在线全文

学校读者我要写书评

暂无评论

Friction 2024年第4期12卷 670-682页

作者： Davide MASSOCCHI Nora LECIS Marco LATTUADA Davide SCAGLIA steven CHATTERTON Paolo PENNACCHI Department of Mechanical Engineering Politecnico di MilanoMilan 20156Italy Eni SpA Downstream product R&DLombardia 20097Italy Eurobearings S.R.L. Lombardia 29016Italy

This experimental study investigates the friction and wear of three coatings commonly used in industrial applications,particularly in hydrodynamic *** three materials under investigation were Babbitt,polyether ether ketone(PEEK)reinforced with 15%carbon fibers,and PEEK reinforced with 20%carbon *** first polymer material was extruded,while the other was produced by fused deposition modelling(FDM).The materials were subjected to sliding tests in a pin-on-disc configuration,with a steel ball serving as the counter *** tests were conducted at room temperature,with a load of 10 N and under three different lubrication conditions:dry,grease,and *** linear speed was set at 0.3 m/s for the dry and semi-solid lubrication tests,while for the oil tests,the speed was set at 0.25 m/*** greases used had consistency grades of NGLI 000 and NGLI *** ISO VG 68 circulation oil was used for the oil lubrication ***,thermodynamic analyses were performed under the most severe conditions(i.e.,dry)to investigate the steel-Babbitt and steel-PEEK contact.

关键词： hydrodynamic bearings polyether ether ketone(PEEK)polymers additive manufacturing grease lubrication sliding oil lubrication ball-on-disk tribology

微波消解-电感耦合等离子体质谱法同时测定聚氯乙烯塑料中的铅、镉、汞、铬

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

现代科学仪器 2007年第4期24卷 85-88页

作者：陈玉红李平张华王英锋施燕支 steven wilbur John Lau 王海舟安捷伦科技有限公司首都师范大学分析测试中心国家钢铁材料测试中心

本文采用微波消解技术作为前处理手段,用电感耦合等离子体质谱(ICP-MS)法同时测定聚氯乙烯塑料中的铅、镉、汞、铬四种元素。对仪器的参数设置、样品的消解方法与体系进行了优化,为同类样品的分析提供了参考。方法检出限为1.4～7.2 ng·... 详细信息

本文采用微波消解技术作为前处理手段,用电感耦合等离子体质谱(ICP-MS)法同时测定聚氯乙烯塑料中的铅、镉、汞、铬四种元素。对仪器的参数设置、样品的消解方法与体系进行了优化,为同类样品的分析提供了参考。方法检出限为1.4～7.2 ng·g^(-1),相对标准偏差为0.6～5.8%。

关键词：微波消解 ICP-MS 聚氯乙烯元素

Conventional and micro scale finite element modeling for metal cutting process:A review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第2期37卷 199-232页

作者： Le WANG Caixu YUE Xianli LIU Ming LI Yongshi XU steven Y.LIANG Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlanta 30332USA

The metal cutting process is accompanied by complex stress field,strain field,temperature *** comprehensive effects of process parameters on chip morphology,cutting force,tool wear and residual stress are complex and *** element method(FEM)is considered as an effective method to predict process variables and reveal microscopic physical phenomena in the cutting ***,the finite element(FE)simulation is used to research the conventional and micro scale cutting process,and the differences in the establishment of process variable FE simulation models are distinguished,thereby improving the accuracy of FE *** reliability and effectiveness of FE simulation model largely depend on the accuracy of the simulation method,constitutive model,friction model,damage model in describing mesh element,the dynamic mechanical behavior of materials,the tool-chip-workpiece contact process and the chip formation *** this paper,the FE models of conventional and micro process variables are comprehensively and up-to-date reviewed for different materials and machining *** purpose is to establish a FE model that is more in line with the real cutting conditions,and to provide the possibility for optimizing the cutting process *** development direction of FE simulation of metal cutting process is discussed,which provides guidance for future cutting process modeling.

关键词： Conventional and micro scale Finite element simulation Metal cutting process Micro cutting Modeling

Oxygen uptake response to switching stairs exercise by non-parametric modeling

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2024年第2期22卷 315-325页

作者： Hairong Yu Chenyu Zhang Kai Cao Hamzah M.Alqudah steven Weidong Su Key Laboratory of Child Development and Learning Science of Ministry of Education and the School of Biological Science and Medical Engineering Southeast UniversityNanjing210096JiangsuChina College of Artificial Intelligence and Big Data for Medical Science Shandong First Medical University and Shandong Academy of Medical SciencesJinan250117ShandongChina Faculty of Engineering and Information Technology University of Technology SydneyUltimoNSW2007Australia

Oxygen uptake plays a crucial role in the evaluation of endurance performance during exercise and is extensively utilized for metabolic assessment. This study records the oxygen uptake during the exercise phase (i.e., ascending or descending) of the stair exercise, utilizing an experimental dataset that includes ten participants and covers various exercise periods. Based on the designed experiment protocol, a non-parametric modeling method with kernel-based regularization is generally applied to estimate the oxygen uptake changes during the switching stairs exercise, which closely resembles daily life activities. The modeling results indicate the effectiveness of the non-parametric modeling approach when compared to fixed-order models in terms of accuracy, stability, and compatibility. The influence of exercise duration on estimated fitness reveals that the model of the phase-oxygen uptake system is not time-invariant related to respiratory metabolism regulation and muscle fatigue. Consequently, it allows us to study the humans’ conversion mechanism at different metabolic rates and facilitates the standardization and development of exercise prescriptions.

关键词： Non-parametric modeling Interval stair training exercise Kernel method.Cardiorespiratory response Oxygen uptake

Simulation of the SMILE Soft X-ray Imager response to a southward interplanetary magnetic field turning

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

Earth and Planetary Physics 2024年第1期8卷 39-46页

作者： Andrey Samsonov Graziella Branduardi-Raymont steven Sembay Andrew Read David Sibeck Lutz Rastaetter Mullard Space Science Laboratory University College LondonDorking RH56NTUK Leicester University Leicester LE17RHUK Goddard Space Flight Center National Aeronautics and Space AdministrationGreenbeltMD 20771USA

The Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)Soft X-ray Imager(SXI)will shine a spotlight on magnetopause dynamics during magnetic *** simulate an event with a southward interplanetary magnetic field turning and produce SXI count maps with a 5-minute integration *** making assumptions about the magnetopause shape,we find the magnetopause standoff distance from the count maps and compare it with the one obtained directly from the magnetohydrodynamic(MHD)*** root mean square deviations between the reconstructed and MHD standoff distances do not exceed 0.2 RE(Earth radius)and the maximal difference equals 0.24 RE during the 25-minute interval around the southward turning.

关键词： magnetopause magnetic reconnection solar wind charge exchange southward interplanetary magnetic field numerical modeling Solar wind Magnetosphere Ionosphere Link Explorer(SMILE) Soft X-ray Imager

An examination of thematic research,development,and trends in remote sensing applied to conservation agriculture

在线全文

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2024年第1期12卷 77-95页

作者： Zobaer Ahmed Aaron Shew Lawton Nalley Michael Popp V.steven Green Kristofor Brye Center for Advanced Spatial Technologies University of ArkansasFayettevilleARUSA Environmental Dynamics Program University of ArkansasFayettevilleARUSA Department of Agricultural Economics and Agribusiness University of ArkansasFayettevilleARUSA College of Agriculture Arkansas State UniversityJonesboroARUSA University of Arkansas System Division of Agriculture Little RockARUSA Department of Crop Soiland Environmental SciencesUniversity of ArkansasFayettevilleARUSA

Conservation agriculture seeks to reduce environmental degradation through sustainable management of agricultural *** the 1990s,agricultural research has been conducted using remote sensing technologies;however,few previous reviews have been conducted focused on different conservation management *** of the previous literature has focused on the application of remote sensing in agriculture without focusing exclusively on conservation practices,with some only providing a narrative review,others using biophysical remote sensing for quantitative estimates of the bio-geo-chemical-physical properties of soils and crops,and few others focused on single agricultural management *** paper used the preferred reporting items for systematic review(PRISMA)methodology to examine the last 30 years of thematic research,development,and trends associated with remote sensing technologies and methods applied to conservation agriculture research at various spatial and temporal scales.A set of predefined key concepts and keywords were applied in three databases:Scopus,Web of Science,and Google Scholar.A total of 188 articles were compiled for initial examination,where 68 articles were selected for final analysis and grouped into cover crops,crop residue,crop rotation,mulching,and tillage *** on conservation agriculture research using remote sensing have been increasing since 1991 and peaked at 10 publications in *** the 68 articles,94%used a pixel-based,while only 6%used an object-based classification *** to 2005,tillage practices were abundantly studied,then crop residue was a focused theme between 2004 and *** 2012 to 2020,the focus shifted again to cover *** spectral indices were used in 76%of the 68 *** examination offered a summary of the new potential and identifies crucial future research needs and directions that could improve the contribution of remote sensing to the provision of long-term operat

关键词： Remote sensing Conservation agriculture Classification algorithm Spatial resolution Satellite Spectral indices PRISMA