Results 1 to 10 of about 143,222 (253)

Determination of 9 Organotins in Food Contact Materials(食品接触材料中9种有机锡的检测) [PDF]

open access: yesShipin kexue jishu xuebao, 2021
An analytical method for simultaneous determination of organotins in food contact materials with different uses by gas chromatography-mass spectrometry was established.
QIAN Chong(钱冲)   +6 more
doaj   +1 more source

Research Progress of Inorganic Bonded Solid Lubricant film [PDF]

open access: yesCailiao Baohu, 2022
Inorganic adhesive solid lubricant film could significantly reduce both the friction coefficient and the high temperature wear, then improve the transmission efficiency.
QIAO Hong - bin, ZHANG Da - wei, TIAN Xue - mei, JIN Ling
doaj   +1 more source

Optical spectrum of the post-AGB Star HD56126 in the wavelength interval 4010-8790 Å Å [PDF]

open access: yesAstrophysical Bulletin, 2007
The optical spectrum of the post-AGB star HD56126 identified with the infrared source IRAS07134+1005 is studied in detail using high spectral resolution observations (R = 25000 and 60000) performed with the echelle spectrographs of the 6-m telescope. A total of about one and a half thousand absorptions of neutral atoms and ions, absorption bands of C2,
V. G. Klochkova   +3 more
openaire   +1 more source

Measurement of the A-Value of the Intersystem Transition in Al II at 2670 Å: Å Progress Report [PDF]

open access: yesInternational Astronomical Union Colloquium, 1984
Ratios of intensities of spectral lines produced in the radiative decay of collisionally-excited levels of atomic ions are versatile indicators of electron density in astrophysical plasmas when one of the lines involves a metastable level (see the review by Feldman 1981 and references therein). Radiative transition probabilities (A-values) and electron
B. Carol Johnson, H.S. Kwong
openaire   +1 more source

电-气互联系统潮流优化与安全性研究综述 [PDF]

open access: yes全球能源互联网, 2019
随着中国能源转型发展,以电网为核心的电-气互联综合能源系统(integrated electricity and gas systems,IEGS)有望成为能源传输的新载体。IEGS作为能源互联网的基础和过渡,对于提升能源利用效率具有重要意义。随着电转气技术的快速发展,电网和天然气网间具备了双向耦合关系。两网耦合程度不断加深,分别对两网进行研究的传统分析方法可能难以满足IEGS运行的可靠性和经济性,因此越来越多的学者将两网视为一个整体展开协同优化等方面的研究。首先介绍了电转气技术的研究及应用现状 ...
林涛, 毕如玉, 杜蕙, 徐遐龄
doaj   +1 more source

Fabrication of pneumatic micropump on glass-PDMS microfluidic chip and its application to chemiluminescence detection(一种基于玻璃-PDMS微流控芯片上气动微泵的研制及其在化学发光分析中的应用研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2007
利用AZ4620光胶制备通道横截面为圆弧形的阳模,采用玻璃与PDMS材料的永久性封合技术,研制了一种玻璃-PDMS复合芯片微流控蠕动型气动微泵,实现单一微泵对多路液流的驱动.实验将该微泵系统应用于K3 [Fe(CN)4]的化学发光检测,对4×10-5 mol/L K3[Fe(CN)6]测定的重现性为0.9%(RSD,n = 7),线性范围6× 10-6~6×10-5 mol/L,线性相关系数R2=0.999 0,检出限为8×10-7 mol/L.
ZHANGLing(张玲)   +3 more
doaj   +1 more source

基于PMC指数模型的电力政策量化及其在负荷预测中的应用

open access: yes智能科学与技术学报, 2021
政策对电力系统负荷有直接的影响。为了充分挖掘政策因素与负荷之间的关系,提高负荷预测的精度,提出一种基于政策建模一致性(PMC)指数的电力政策量化方法,并将其应用到负荷预测中。首先建立电力领域PMC评价体系,然后通过文本挖掘技术得到电力政策文本的PMC指数,最后构建基于长短期记忆的负荷预测模型,将电力政策量化指标与天气、日期等影响因素一同输入模型中,与不考虑政策因素的模型进行对比。实验表明,考虑政策因素的负荷预测模型获得了较好的结果,加入政策量化数据后,负荷预测模型的平均绝对百分比误差从1.67降低到0 ...
刘天斌   +8 more
doaj  

Accurate Detection of 8 Long-Chain Fatty Acid Ethyl Esters in Baijiu Based on Magnetic Solid Phase Extraction-Gas Chromatography-Mass Spectrometry Combined with Isotope Internal Standards(磁性固相萃取-气质联用-同位素内标法精准检测白酒中8种高级脂肪酸乙酯) [PDF]

open access: yesShipin kexue jishu xuebao
Long-chain fatty acid ethyl ester is one of the important factors causing the turbidity of Baijiu. In order to systematically analyze the effect of long-chain fatty acid ethyl ester content in Baijiu and improve the turbidity issue of Baijiu production ...
CHEN Xiaoman(陈晓漫)   +7 more
doaj   +1 more source

Fluorescence quenching method for the determination of propylthiouracil with functionalized ZnS nanoparticles as fluorescence probe(功能化ZnS纳米荧光探针荧光猝灭法测定丙硫氧嘧啶)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2010
研究了丙硫氧嘧啶对L—半胱氨酸包覆的ZnS纳米粒子荧光强度的影响,发现在pH=6.5的KH2PO4-NaOH缓冲溶液中,丙硫氧嘧啶对功能化ZnS纳米粒子有荧光猝灭作用,据此建立了以功能化的ZnS纳米粒子为荧光探针测定药物制剂中丙硫氧嘧啶含量的荧光分析法.丙硫氧嘧啶浓度在4.00×10-6~4.00×10-4 mol • L-1范围内与体系的荧光强度线性关系良好,相关系数r=0.998 7,检出限(S/N=3)为1.70×10-6 mol • L-1,对浓度为4.00× 10-5 mol • L ...
LIJuan-juan(李娟娟)   +1 more
doaj   +1 more source

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