NCP

[img]http://www.instrument.com.cn/bbs/images/affix.gif[/img][url=http://www.instrument.com.cn/bbs/download.asp?ID=130113]hplc column protection[/url]

小弟用GC-NPD做噻嗪酮时，发现一运行方法是铷珠电压就降下去，把铷珠电压开起来运行方法时他又掉下去，运行条件都是按国标的设置去设置的，是神马原因，求大神指点。。。。http://simg.instrument.com.cn/bbs/images/default/em09507.gif

The 10th Uppsala Conference on ECD/ETD and Related Topics, 2013, Beijinghttp://uppcon2013.csp.escience.cn/北京友谊宾馆，要注册费。不错，有不少牛人。

实验室最近准备开SCCP的测试，买了一台GC-NCI，进了50PPM的标样，响应值很低，用的六氯苯做内标，内标的响应很大。之前没有用过GC-NCI，求解怎么才能提高待测物的响应值呢？

请问Xwinnmr的处理参数NC_proc的定义和如何计算得到。谢谢！

[font=&]【题名】：Attosecond-pump attosecond-probe x-ray spectroscopy of liquid water[font=-apple-system, BlinkMacSystemFont, &][size=16px][/size][/font][/font][font=&]【全文链接】: https://www.science.org/doi/10.1126/science.adn6059[/font]

Protein NMR Spectroscopy 第二版[912页]这是一本蛋白质NMR专著，理论与实践。[img]http://www.instrument.com.cn/bbs/images/affix.gif[/img][url=http://www.instrument.com.cn/bbs/download.asp?ID=105940]Protein NMR Spectroscopy [/url][img]http://ng1.17img.cn/bbsfiles/images/2008/08/200808261735_105941_1604620_3.gif[/img]

谁知道Shimadzu的PC-55N的接法? 能否分享一下?

Downconversion luminescence spectra were recorded with a Hitachi F-4500 fluorescence spectrophotometer. Upconversion fluorescence spectra were obtained on the Hitachi F-4500 fluorescence spectrophotometer with a 0-800 mW adjustable laser (980 nm, Beijing Hi-Tech Optoelectronic Co.,China) as the excitation source, instead of the xenon source in the spectrophotometer, and with a fiber optic accessory.upconversion fluorescence spectra 的测试方法是否同普通的荧光光谱测试方法相同！所谓光源使用的可调激光具体怎么操作望有过这方面操作经验的达人现身说法！

求Waters CN-RP色谱柱的说明书，只有柱子没有说明书了，如果有的共享一下呗，谢谢啦！

new draft harmonized cen standard on emissions from construction products-princples common with iso 16000 and EN 717-1 and differences

（精品图书）红外光谱基础与应用[url=http://www.instrument.com.cn/download/shtml/016576.shtml]Infrared_Spectroscopy_-_Fundamentals_and_Applications[/url]Wiley 荣誉出品，208页 英文版pdf，仪器结构图非常清晰，图书中的精品！AnTS Analytical Techniques in the SciencesContents1 Introduction 12 Experimental Methods 153 Spectral Analysis 454 Organic Molecules 715 Inorganic Molecules 956 Polymers 1137 Biological Applications 1378 Industrial and Environmental Applications 167[em45] [em45] [em45] [em45] [em45]

请问：GC-NPD的基线不稳，基流不能保持在30pA左右是什么原因？还有当基流在30时铷珠电压在3.625，这样对铷珠危险吗？谢谢您的关注！

出售杭州盈傲多参数水质分析仪cnpn-4s 2，八成新，使用次数少，一切功能正常，给价就出，详细介绍：https://site.china.cn/codjianceyq/4162451000.html

[align=left][b][size=4]Basic 1H- and 13C-NMR Spectroscopy[/size][/b][size=3]Elsevier, 2005Author: Metin BalciISBN: 978-0-444-51811-8[/size][b]PrefacePart I: 1H-NMR Spectroscopy[/b]1 - Introduction, Pages 3-82 - Resonance Phenomena, Pages 9-243 - Chemical Shift, Pages 25-854 - Spin-Spin Splitting in 1H-NMR Spectra, Pages 87-1335 - Spin-Spin Splitting to Different Protons, Pages 135-1586 - Spin Systems: Analysis of the 1H-NMR Spectra, Pages 159-1977 - NMR Shift Reagents and Double Resonance Experiments: Simplification ofthe NMR Spectra, Pages 199-2128 - Dynamic NMR Spectroscopy, Pages 213-231[b]Part II: 13C-NMR Spectroscopy[/b]9 - Introduction, Pages 235-23910 - Absorption and Resonance, Pages 241-25111 - Pulse NMR Spectroscopy, Pages 253-28112 - Chemical Shift, Pages 283-29213 - 13C Chemical Shifts of Organic Compounds, Pages 293-32414 - Spin-Spin Coupling, Pages 325-33715 - Multiple-Pulse NMR Experiments, Pages 339-375[b]Part III: Two-Dimensional (2D) NMR Spectroscopy[/b]16 - Two-Dimensional (2D) NMR Spectroscopy, Pages 379-406Solutions to Exercises, Pages 407-411References, Pages 413-417Index, Pages 419-427[/align]

求助！我用的是GC6890N，HP-5柱，分离物质的单品标样保留时间分别是1.744min和1.753min ,混标却分不开，这是我将升温速度调到0.5℃/min，还是分不开，我用的是甲苯为溶剂的，请问我还有什么办法？

[font=&][size=13px][color=#888888]*主要功能：硬件连接；参数配置；运行参数；数据查询。[/color][/size][/font][font=&][size=13px][color=#888888]*程控对象：示波器。[/color][/size][/font][font=&][size=13px][color=#888888]*程控接口：兼容市面上所有具有GPIB、USB、RS232、LAN、RS485、TTL任意一种程控接口的示波器。[/color][/size][/font][font=&][size=13px][color=#888888]*仪器兼容性：泰克Tektronix、是德科技Keysight、普源Rigol、力科、罗德与施瓦茨R&S等品牌示波器。[/color][/size][/font][font=&][size=13px][color=#888888][b] 1.软件概述[/b] 为了解决示波器测试操作流程繁琐、参数配置复杂等问题，Namisoft开发的NS-Scope[url=http://www.namisoft.com/Softwarecenterdetail/540.html]示波器程控软件[/url]，通过对示波器的程序控制，实现自动化参数配置、数据采集和数据存储，软件自带数据库存储，方便用户查询历史检测数据，最大限度提高仪器使用效率。[/color][/size][/font][align=center][img=示波器程控.jpg]http://www.namisoft.com/UserFiles/Article/image/6374206847990437872930448.jpg[/img][/align] [b][font=微软雅黑, &][size=14px] [size=16px]2. 主要功能[/size][/size][/font][/b][size=16px][font=微软雅黑, &][size=14px] [/size][/font]硬件连接：软件自动检测通道配置信息及仪器设备连接状态，保证测试环境的稳定可靠性。[/size][size=16px][font=微软雅黑, &][size=14px] [/size][/font]参数配置：包括采集模式、触发模式、触发间隔设置、时基、通道配置等，软件可自动保存配置信息，支持二次调用。[/size][size=16px][font=微软雅黑, &][size=14px] [/size][/font]运行测试：根据参数配置信息，软件自动运行测试并实时采集测试数据及波形图包括：脉宽、频率、幅值、上升时间、下降时间、过冲等。[/size][size=16px][font=微软雅黑, &][size=14px] [/size][/font]数据查询：软件将实时采集的数据保存至用户指定路径，系统自带特定格式数据库，方便历史数据查看调用。[/size][font=微软雅黑, &][size=16px][/size][/font][size=16px][b][size=16px] 3.兼容仪器[/size][/b][/size][size=16px][b][size=16px][/size][/b][font=微软雅黑, &][size=14px] 泰克Tektronix、是德科技Keysight、普源Rigol、力科、罗德与施瓦茨R&S等品牌示波器。[/size][/font][/size][font=微软雅黑, &][size=14px][/size][/font][font=微软雅黑, &][size=14px][/size][/font][align=center][img=示波器兼容仪器.png]http://www.namisoft.com/UserFiles/Article/image/6374027025903108564070070.png[/img][/align][b] [size=16px] 4.[b]软件[/b]要求[/size][font=微软雅黑, &][b] 软件环境[/b][/font][/b][font=微软雅黑, &][size=16px][font=Wingdings]l [/font]Windows/XP SP3及以上操作系统；[/size][/font][font=微软雅黑, &][size=16px][font=Wingdings]l[/font] NI-VISA驱动；[/size][/font][font=微软雅黑, &][size=16px][font=Wingdings]l [/font]sqlite数据库。[/size][/font][b][font=微软雅黑, &][b]硬件环境[font=宋体][/font][/b][/font][/b][font=微软雅黑, &][size=16px][font=Wingdings]l [/font]电脑CPU要求：双线程，2GHz主频以上；[/size][/font][font=微软雅黑, &][size=16px][font=Wingdings]l [/font]电脑内存要求：1G；[/size][/font][font=微软雅黑, &][size=16px][font=Wingdings]l [/font]电脑硬盘要求：[size=14px][/size]4G以上空间。[/size][/font][size=16px] [/size][font=微软雅黑, &][size=16px] [b] 5. [b]软件[/b]流程图[/b][/size][/font][align=center][img=示波器程控软件流程图.png,500,419]http://www.namisoft.com/UserFiles/Article/image/6371167072747216948950281.png[/img][/align] [font=微软雅黑, &][size=16px][b][b]6. [b]软件界面[/b][/b][/b][/size][/font][font=微软雅黑, &][size=14px][b][/b][/size][/font][align=center][font=微软雅黑, &][size=14px][b][img=产品界面.png,800,644]http://www.namisoft.com/UserFiles/Article/image/6373829031559358561043033.png[/img][/b][/size][/font][/align][font=微软雅黑, &][size=14px][b] [/b][/size][/font][font=微软雅黑, &][size=14px][b] [size=16px] 7.应用场景[/size][/b][/size][/font][font=微软雅黑, &][size=14px][b][/b][/size][/font][align=center][font=微软雅黑, &][size=14px][b][img=应用场景图.png]http://www.namisoft.com/UserFiles/Article/image/6374985738838118821313829.png[/img][/b][/size][/font][/align]

有人可以帮我解答一下，easy nLC1000 里面的 one column setup 和 two column setup 的区别吗？ 分析柱的预平衡是流到 waste里面的吗？[img]https://ng1.17img.cn/bbsfiles/images/2019/06/201906062357106224_3013_3491516_3.png[/img]

[b][font='Microsoft YaHei', 宋体, sans-serif]【序号】：１[/font]【作者】：[font=sans-serif][/font][font=Arial][font=Archivo, &][size=16px]Harvey M. Spencer[/size][/font][/font][font=sans-serif][/font][/b][font='Microsoft YaHei', 宋体, sans-serif][b][b][/b][/b][/font][font=&]【题名】：[b][b][b][font=&][size=30px][b]Optical Design Considerations for Wide Spectral Band Applications using Refractive Optics[/b][/size][/font][/b][/b][/b][/font][font=&]【期刊】：[/font][font=Arial][size=12px]OSA[/size][/font][font='Microsoft YaHei', 宋体, sans-serif][color=#545454][b]【链接】：[url=https://opg.optica.org/viewmedia.cfm?uri=IODC-2014-ITu3A.4&seq=0]Optical Design Considerations for Wide Spectral Band Applications using Refractive Optics[/url][/b][/color][/font]

主要包括一些元素的基本性质,标准储存及稳定性,样品的处理,谱线及干扰,检出现等内容,对新手很有指导作用.Silicon Location: Group 14, Period 3 Atomic Weight: 28.0855 Coordination Number: 6 Chemical Form in Solution: Si(OH)x(F)y2- Storage & Handling: Keep tightly sealed when not in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not return portions removed for pipetting to container.Chemical Compatibility: Soluble in HCl, HF, H3PO4, H2SO4, and HNO3 as the Si(OH)x(F)y2-. Avoid neutral to basic media. Unstable at ppm levels with metals that would pull F- away (i.e. - do not mix with Alkaline or Rare Earths, or high levels of transition elements unless they are fluorinated). Stable with most inorganic anions with a tendency to hydrolyze forming silicic acid (silicic acid is soluble up to ~ 100 ppm in water) in all dilute acids except HF.Stability: 2-100 ppb levels - stability unknown - (alone or mixed with all other metals) as the Si(OH)x(F)y2-. 1-10,000 ppm single element solutions as the Si(OH)x(F)y2- chemically stable for years in 2-5% HNO3 / trace HF in a LDPE container.Si Containing Samples (Preparation & Solution): Metal (soluble in 1:1:1 H2O / HF / HNO3) Oxide - SiO2, amorphic (dissolve by heating in 1:1:1 H2O / HF / HNO3) Oxide-quartz (fuse in Pt0 with Na2CO3) Geological Samples (fuse in Pt0 with Na2CO3 followed by HCl solution of the fuseate) Organic Matrices containing silicates and non volatile silicon compounds (dry ash at 450°C in Pt0 and dissolve by gently warming with 1:1:1 H2O / HF / H2SO4 or fuse / ash with Na2CO3 and dissolve fuseate with HCl / H2O) Silicone Oils - dimethyl silicones depolymerize to form volatile monomer units when heated (measure directly in alcoholic KOH / xylene mixture where sample is treated first with the KOH at 60 - 100°C to "unzip" the Si-O-Si polymeric structure or digest with conc. H2SO4 / H2O2 followed by cooling and dissolution of the dehydrated silica with HF). Note that the direct analysis of silicone oils in an organic solvent will result in false high results due to high vapor pressure of volatile monomer units such as hexamethylcyclotrisiloxane. The KOH forms the K2+Si(CH3)2O=NaCl, which is not volatile at room temperature. Atomic Spectroscopic Information: (red text indicates severe at ~ concs.) Technique / Line Estimated D.L.* Order Type Interferences ICP-OES 251.611 nm 0.012/.003 µ g/mL 1 ion Ta, U, Zn, Th ICP-OES 212.412 nm 0.02/.01 µ g/mL 1 ion Hf, Os, Mo, Ta ICP-OES 288.158 nm 0.03/.004 µ g/mL 1 ion Ta, Ce, Cr, Cd, Th [url=https://insevent.instrument.com.cn/t/yp][color=#3333ff]ICP-MS[/color][/url] 28 amu 4000 - 8000 ppt n/a M+ 14N2, 12C16O *ICP-OES D.L.'s are given as radial / axial view

1Cinnamophilin Isolated from Cinnamomum philippinense Protects against Collagen Degradation in Human ChondrocytesYung-Chang Lu1,2,3, George Hsiao4, Kuan-Hung Lin4, Ming-Shium Hsieh1,5, Thanasekaran Jayakumar4, Tian-Shung Wu1,6,7,8,* andJoen-Rong Sheu1,4,*Phytotherapy ResearchVolume 27, Issue 6, pages 892–899, June 2013http://onlinelibrary.wiley.com/doi/10.1002/ptr.4812/abstract2Flavones from the Bark of Lindera caudata and Their Anti-Tobacco Mosaic Virus ActivityYu-Chun Yang1,2, Ying Qin1, Xian-Xue Wu1,2, Cong-Fang Xia1, Yan-Lin Meng1, Bin Zhou1, Yan-Qing Ye1, Xue-Mei Gao1, Yin-Ke Li1,2,* andQiu-Fen Hu1,*Bulletin of the Korean Chemical SocietyVolume 36, Issue 4, pages 1161–1164, April 2015http://onlinelibrary.wiley.com/doi/10.1002/bkcs.10216/abstract3Chem Biodivers. 2008 Dec;5(12):2690-8. doi: 10.1002/cbdv.200890223.Antimycobacterial butanolides from the root of Lindera akoensis.Chang SY1, Cheng MJ, Peng CF, Chang HS, Chen IS.http://onlinelibrary.wiley.com/doi/10.1002/cbdv.200890223/abstract4Isophilippinolide A Arrests Cell Cycle Progression and Induces Apoptosis for Anticancer Inhibitory Agents in Human Melanoma CellsHui-Min David Wang, Chung-Yi Chen, and Pei-Fang WuJ. Agric. Food Chem., 2014, 62 (5), pp 1057–1065Publication Date (Web): December 20, 2013 (Article)http://pubs.acs.org/doi/abs/10.1021/jf403730z5J Nat Med. 2011 Jan;65(1):198-201. doi: 10.1007/s11418-010-0454-1. Epub 2010 Aug 14.Chemical constituents of the stems and twigs of Lindera umbellata.Kuroda M1, Sakurai K, Mimaki Y.http://link.springer.com/article/10.1007%2Fs11418-010-0454-1

http://www.icts.cn/science/060814/060814LectureNotes.htm大牛们的报告都是很好的。推荐给各位看看。会议两年一次，下一次在08年，建议大家有空的话去学习学习，^_^

wnnzl现为AAS版版主，在某国家级研究机构从事icp-ms重金属分析，LC-ICP-MS（砷、硒）形态分析工作--主要分析食品、环境中的元素及形态；鉴于ICP-MS版面从事重金属形态分析的比较少，而形态分析是大势所趋。 因此建议wnnzl来我版做版主或专家，具体任职由管理员和wnnzl协商决定。