检索结果-南通市图书馆

采用GC/MSD DRS对残留农药进行全面筛查应用

在线全文

学校读者我要写书评

暂无评论

电子质量 2006年第5期 20-24,29页

作者： philip l.wylie Michael J.Szelewski Chin-Kai Meng Agilent Technologies Inc.

本文阐述了采用保留时间锁定(RTl)和谱图Deconvolution技术,建立了一种能够筛查567种农药和可疑内分泌干扰物的简单的GC/MS分析方法。

关键词：残留农药 DRS 化合物

采用GC/MSD DRS对残留农药进行全面筛查应用

在线全文

学校读者我要写书评

暂无评论

化工文摘 2004年第6期 51-55页

作者： philip l.wylie Michael J.Szelewski Chin-Kai Meng Christopher P.Sandy Agilent Technologies Inc

1 前言根据农药手册，目前世界上正在使用的农药有700多种。大约600种农约是过去使用的，但现在已经禁用或不再销售。有一些农药早已不再使用，但它们仍然存在于环境中，还可能在植物和动物体内生物富集。在食品和饮料、在土壤、水和... 详细信息

1 前言根据农药手册，目前世界上正在使用的农药有700多种。大约600种农约是过去使用的，但现在已经禁用或不再销售。有一些农药早已不再使用，但它们仍然存在于环境中，还可能在植物和动物体内生物富集。在食品和饮料、在土壤、水和大气、在水生和陆生的动植物、在人类血液、脂肪组织和乳汁．都能检测到痕量的农药或它们的代谢物。

关键词：农药残留量毒性分析方法污染物色谱

Autism spectrum disorder:difficulties in diagnosis and microRNA biomarkers

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第10期20卷 2776-2786页

作者： Bridget Martinez philip V.Peplow Department of Pharmacology University of Nevada-RenoRenoNVUSA Department of Medicine University of Nevada-RenoRenoNVUSA Department of Anatomy University of OtagoDunedinNew Zealand

We performed a PubMed search for microRNAs in autism spectrum disorder that could serve as diagnostic biomarkers in patients and selected 17 articles published from January 2008 to December 2023,of which 4 studies were performed with whole blood,4 with blood plasma,5 with blood serum,1 with serum neural cell adhesion molecule l1-captured extracellular vesicles,1 with blood cells,and 2 with peripheral blood mononuclear *** of the studies involved children and the study cohorts were largely *** of the studies had performed microRNA sequencing or quantitative polymerase chain reaction assays to measure microRNA *** five studies had used real-time polymerase chain reaction assay to validate microRNA expression in autism spectrum disorder subjects compared to *** microRNAs that were validated in these studies may be considered as potential candidate biomarkers for autism spectrum disorder and include miR-500a-5p,-197-5p,-424-5p,-664a-3p,-365a-3p,-619-5p,-664a-3p,-3135a,-328-3p,and-500a-5p in blood plasma and miR-151a-3p,-181b-5p,-320a,-328,-433,-489,-572,-663a,-101-3p,-106b-5p,-19b-3p,-195-5p,and-130a-3p in blood serum of children,and miR-15b-5p and-6126 in whole blood of *** important limitations were identified in the studies reviewed,and need to be taken into account in future *** studies are warranted with children and adults having different levels of autism spectrum disorder severity and consideration should be given to using animal models of autism spectrum disorder to investigate the effects of suppressing or overexpressing specific microRNAs as a novel therapy.

关键词： autism spectrum disorder biomarker blood cells blood plasma blood serum diagnosis microRNA peripheral blood mononuclear cells serum neural cell adhesion molecule l1-captured extracellular vesicles whole blood

吹扫捕集/5975inert气-质联用仪分析水中的挥发性有机化合物

在线全文

学校读者我要写书评

暂无评论

环境化学 2008年第4期27卷 543-548页

作者： philip l.wylie Agilent Technologies Inc. 2850 Centerville Road Wilmington DE 19808 -1610 USA

以美国环保局(USEPA)8260B方法为基础,分析水中挥发性有机化合物(VOC).虽然8260B方法的适用范围存在一定的局限性,但采用吹扫捕集(P&T)/气质(GC/MS)联用法分析VOC时,该方法适用于大部分VOC的分析.使用新的"电子方法输入"(eMethod Import... 详细信息

以美国环保局(USEPA)8260B方法为基础,分析水中挥发性有机化合物(VOC).虽然8260B方法的适用范围存在一定的局限性,但采用吹扫捕集(P&T)/气质(GC/MS)联用法分析VOC时,该方法适用于大部分VOC的分析.使用新的"电子方法输入"(eMethod Import)这一化学工作站的特殊功能,能够加载方法和所有的参数.虽然吹扫捕集的参数不能自动输入,但在该电子方法中已包括了吹扫捕集的方法.

关键词：挥发性有机化合物吹扫捕集气-质联用仪析水电子方法自动输入美国环保局加载方法

使用具有解卷积报告软件和新农药数据库的GC／MS筛选926种农药和内分泌干扰物

在线全文

学校读者我要写书评

暂无评论

环境化学 2008年第2期27卷 273-277页

作者： philip l.wylie Agilent Technologies Inc．2850 Centerville Rd．WilmingtonDE 19808-1610USA

介绍一种最新扩展的质谱数据库,来代替安捷伦的保留时间锁定农药数据库和解卷积农药应用.新的数据库包括926种农药、内分泌干扰物质和相关化合物——比原来的数据库多了359种化合物,包括日本的"肯定列表(Positive list)"中用GC/MS分析... 详细信息

介绍一种最新扩展的质谱数据库,来代替安捷伦的保留时间锁定农药数据库和解卷积农药应用.新的数据库包括926种农药、内分泌干扰物质和相关化合物——比原来的数据库多了359种化合物,包括日本的"肯定列表(Positive list)"中用GC/MS分析的所有化合物.所有保留时间锁定的化合物,都可以在安捷伦的GC/MS保留时间锁定软件中精确重复.新的数据库可以作为标准的GC/MS数据库来确证化合物,或者结合安捷伦筛选软件在保留时间和质谱谱图匹配的基础上定性检测化合物.当这些数据库与安捷伦新版本的解卷积报告软件(部件号G1716AA版本A.03.00)结合使用时,可以得到最大的收益.本方法对所有926种农药和内分泌干扰物进行GC/MS筛选,大约只需要2min.解卷积帮助确证谱图中隐藏在共流出物中的农药.本文比较了新的数据库和较小的数据库,通过解卷积报告软件分析17个地表水样品.在新的数据库的协助下,解卷积报告软件找到了99种农药、代谢物、阻燃剂和相关污染物,而这些在以前的农药和内分泌干扰物保留时间所定数据库中是不包含的.

关键词： GC/MS分析内分泌干扰物质质谱数据库软件分析新农药解卷积筛选相关化合物

A proposed U.S./China theoretical/experimental collaborative effort on baryon resonance extraction

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第12期33卷 1222-1229页

作者： philip l. Cole Idaho State University Department of Physics Pocatello Idaho 83209-8106 USA

In this paper we discuss the reasons for our work towards establishing a new collaboration between Jefferson lab （Jlab） and the Institute of High Energy Physics （IHEP） in Beijing. We seek to combine experimentalists and theorists into a dedicated group focused on better understanding the current and future data from Jlab and from the Beijing Electron Positron Collider （BEPC）. Recent Jlab results on the extraction of single- and double-polarization observables in both the lπ- and 2π-channel show their high sensitivity to small production amplitudes and therefore their importance for the extraction of resonance parameters. The Beijing Electron Spectrometer （BES） at the BEPC has collected high statistics data on J/ψ production. Its decay into baryon-antibaryon channels offers a unique and complementary way of probing nucleon resonances. The CEBAF large Acceptance Spectrometer, ClAS, has access to N＊ form factors at high Q2 which is advantageous for the study of dynamical properties of nucleon resonances, while the low-background BES results will be able to provide guidance for the search for less-dominant excited states at Jlab. Moreover, with the recently approved experimental proposal Nucleon Resonance Studies with ClAS12 and the high-quality data streaming from BES-Ⅲand ClAS, the time has come for forging a new Trans-Pacific collaboration of theorists and experimentalists on NSTAR physics.

关键词： baryon resonances electromagnetic form factors J/ψ production CEBAF large AcceptanceSpectrometer (ClAS) Jefferson laboratory (Jlab) Beijing Electron Spectrometer (BES) Beijing ElectronPositron Collider (BEPC) Institute of High Energy Physics (IHEP)

Nonlinear Capillary-Gravity Waves Produced by a Vertically Oscillating Plate

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1998年第2期13卷 147-162页

作者： philip l.-F.lIU Professor Cornell UniversityIthacaNY14853U.S.A.

The nonlinear capillary-gravity wave produced by a vertically oscillating plate, in which the contact-angle model is considered, is studied by use of the Boundary Integral Equation Method (BIEM). The present numerical experiment shows that the code is robust and efficient for modeling the generation and propagation of capillary-gravity waves. It is found that the wave heights of stationary periodic nonlinear waves radiated away from the plate are dependent on the parameters involved in the contact-angle model. The effect of the contact-angle hysteresis and the nonlinearity of capillary-gravity waves on the wave profile is discussed in the paper.

关键词： Boundary Integral Equation Method nonlinear capillary-gravity wave wavemaker

φ-meson photoproduction off the protons by using linearly polarized photons in the mid- to higher-t regimes at threshold energies

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第12期33卷 1349-1353页

作者： Julian Salamanca philip l. Cole Idaho State University Department of Physics Pocatello ID 83209-8106 USA Thomas Jefferson National laboratory. Newport News VA 23606 USA

Observables from vector meson photoproduction by linearly-polarized photons can be expressed in term of bilinear combinations of helicity amplitudes parameterized by the Spin Density Matrix Elements （SDMEs）. These SDMEs give straightforward relations for understanding the nature of the parity exchange at threshold energies, as well as for extracting signatures of the Okubo-Zweig-Iizuka violation. This paper will show preliminary measurements of SDMEs for γp →φp in the photon energy range of 1.7 to 1.9 GeV （momentum transfer squared t range of -1.2 to -0.25 GeV2） and 1.9 to 2.1 CeV （t range of -1.4 to -0.25 GeV2） from the g8b experimental data collected in the summer of 2005 in the Hall B of Jefferson lab.

关键词： photoproduction of Ф-mesons linearly-polarized photons polarization observables

Performance analysis of fuzzy BlS using different cluster methods for classification

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2021年第4期64卷 232-234页

作者： Shuang FENG C.l.philip CHEN School of Applied Mathematics Beijing Normal University Faculty of Science and Technology University of Macau

Dear editor,Neural networks (NNs) and fuzzy systems are commonly used computational intelligence techniques, each with their own merits in terms of applications. The integration of NNs and fuzzy systems, which leads to a hybrid framework known as neuro-fuzzy systems, inherits the useful properties of its constituents:the learning power of an NN and the knowledge representation of a fuzzy inference system,

关键词： fuzzy broad learning system clustering fuzzy c-means classification TSK fuzzy system