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选择性催化还原SCR流场优化浅析

全面腐蚀控制 2022年第12期36卷 20-23页

作者：詹清阳刘晓杰阮富城欧鲤辉李颖金立梅国能(泉州)热电有限公司福建泉州362801 深圳市安瑞昕电力科技有限公司广东深圳518038

通过对SCR脱硝系统的研究,发现烟道流场的紊乱是造成氨逃逸以及降低脱硝效率的根本原因,总结出了优化流场的主要手段和目的:(1)CFD建模仿真分析技术是SCR流场优化的主要分析方法;(2)优化烟道流场和反应器的布置,确定导流板的形状、尺寸... 详细信息

通过对SCR脱硝系统的研究,发现烟道流场的紊乱是造成氨逃逸以及降低脱硝效率的根本原因,总结出了优化流场的主要手段和目的:(1)CFD建模仿真分析技术是SCR流场优化的主要分析方法;(2)优化烟道流场和反应器的布置,确定导流板的形状、尺寸、数量以及位置;(3)优化反应器前烟气流速、温度分布、压力分布和氨氮摩尔比分布;(4)优化反应器中整流器的设置,使催化剂表面烟气的冲角降至最低;(5)模拟飞灰沉积情况,确定积灰位置以及控制积灰高度在设计范围内。

关键词：锅炉 SCR 流场脱硝

HPLC-DAD法同时测定SHF抗抑郁皂苷部位中5个指标成分含量

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天津医科大学学报 2017年第5期23卷 464-468页

作者：李俊强靳美娜李冰洁王冉冉乔卫天津医科大学药学院天津市临床药物关键技术重点实验室天津300070

目的:应用高效液相-二极管阵列法(HPLC-DAD)建立同时测定酸枣仁合欢方(SHF)抗抑郁皂苷部位中氧化芍药苷、芍药内酯苷、芍药苷、(-)-丁香树脂酚-4-O-β-D-呋喃芹糖基-(1→2)-β-D-吡喃葡萄糖苷、白桦酯酸等5个指标成分含量的分析方法,并... 详细信息

目的:应用高效液相-二极管阵列法(HPLC-DAD)建立同时测定酸枣仁合欢方(SHF)抗抑郁皂苷部位中氧化芍药苷、芍药内酯苷、芍药苷、(-)-丁香树脂酚-4-O-β-D-呋喃芹糖基-(1→2)-β-D-吡喃葡萄糖苷、白桦酯酸等5个指标成分含量的分析方法,并指认5个指标成分的来源,以建立SHF抗抑郁有效部位的质量控制方法。方法:色谱柱:Agilent TC-C18柱(规格:4.6 mm×250 mm,5μm);流动相:乙腈(A)-0.1%磷酸水;梯度洗脱,运行时间:85 min,洗脱程序为:0~9 min,7%~14%A;9~20min,14%A;20~31 min,14%~20%A;31~32 min,20%~23%A;32~44 min,23%~32%A;44~52 min,32%~36%A;52~65 min,36%~63%A;65~85 min,63%~100%A。流速:1 m L·min-1;检测波长:204 nm;柱温:30℃;进样量:20μL。通过比较各单味药材皂苷部位与缺单味药的阴性皂苷部位、混合标准品、全方皂苷部位的HPLC图,指认出5个指标成分的来源。结果:在上述色谱条件下各成分峰均能达到分离,分离度良好。在各自的测定浓度范围内,SHF抗抑郁皂苷部位中5个指标成分均呈现良好的线性关系(R2>0.999),其回收率均不小于97.0%。5个指标成分中氧化芍药苷、芍药内酯苷、芍药苷均来源于白芍;(-)-丁香树脂酚-4-O-β-D-呋喃芹糖基-(1→2)-β-D-吡喃葡萄糖苷全部来源于合欢皮;白桦酯酸在4味药材中均有体现。结论:HPLC-DAD测定方法快速、灵敏、重现性良好,实现了一次进样同时测定SHF抗抑郁皂苷部位中5种指标成分含量,为研制简单有效、质量可控的创新中药奠定了基础。

关键词：酸枣仁合欢方皂苷 HPLC-DAD 含量

Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe–0.1C–5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2025年第02期 369-379页

作者： mei Zhang Wenhao li Yangfei Chen Yang Jiang Xiaofei Guo Han Dong State Key Laboratory of Advanced Special Steel Shanghai University School of Materials Science and Engineering Shanghai University

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe–0.10C–5Mn) was investigated during uniaxial tensile testing. In-situ observations under scanning electron microscopy, transmission electron microscopy, and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation mechanisms. These findings were discussed with the local strain measurements via digital image correlation. The results indicated that Lüders band formation in the steel was limited to 1.5% strain, which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA), which led to localized stress concentrations and strain hardening and further retardation of yielding. The small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin–Le Chatelier effect. The volume fraction of RA gradually decreased from 26.8% to 8.2%prior to fracture. In the late deformation stage, fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

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离子选择性电极在药物分析中的应用

山东化工 2002年第2期31卷 13-15页

作者：宋闯景丽洁金晶梅花李娟吉林化工学院环境化工系吉林吉林132022

着重论述近十几年来离子选择性电极在药物分析中应用的进展。

关键词：离子选择性电极药物分析应用 PVC膜评述

Effect and mechanism of siderite on reverse flotation of hematite

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International Journal of Minerals,Metallurgy and Materials 2016年第4期23卷 373-379页

作者： Wan-zhong Yin Dong li Xi-mei Luo jin Yao Qian-yu Sun College of Resources and Civil Engineering Northeastern University College of Zijin Mining Fuzhou University Faculty of Land Resource Engineering Kunming University of Science and Technology

The effects of siderite on reverse flotation of hematite were investigated using micro flotation, adsorption tests, and Fourier transform infrared spectroscopy. The flotation results show that interactions between siderite and quartz are the main reasons that siderite significantly influences the floatability. The interactions are attributed to dissolved siderite species and fine siderite particles. The interaction due to the dissolved species is, however, dominant. Derjaguin-Landau-Verwey-Overbeek（DLVO） theoretical calculations reveal that adhesion on quartz increases when the siderite particle size decreases and that fine particles partly influence quartz floatability. Chemical solution calculations indicate that the dissolved species of siderite might convert the surface of active quartz to CaCO_3 precipitates that can be depressed by starch. The theoretical calculations are in good agreement with the results of adsorption tests and FTIR spectroscopy and explain the reasons why siderite significantly influences reverse flotation of hematite.

关键词： hematite siderite reverse flotation solution chemistry

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超声辅助法提取红豆种皮中花色苷的工艺研究

保鲜与加工 2022年第11期22卷 41-47页

作者：金丽梅朱成成杨斯琪邸子清左锋黑龙江八一农垦大学食品学院黑龙江大庆163319 黑龙江省杂粮加工及质量安全工程技术研究中心黑龙江大庆163319 国家杂粮工程技术研究中心黑龙江大庆163319 黑龙江省农产品加工工程技术研究中心黑龙江大庆163319

采用超声辅助乙醇溶剂法对红豆种皮中的花色苷进行了提取工艺研究。通过单因素试验考察了料液比、pH、乙醇体积分数、超声温度以及超声功率对红豆种皮花色苷提取效果的影响,在此基础上进行响应面试验,进一步优化了红豆种皮色素的提取工... 详细信息

采用超声辅助乙醇溶剂法对红豆种皮中的花色苷进行了提取工艺研究。通过单因素试验考察了料液比、pH、乙醇体积分数、超声温度以及超声功率对红豆种皮花色苷提取效果的影响,在此基础上进行响应面试验,进一步优化了红豆种皮色素的提取工艺。结果表明:影响花色苷提取效果的各因素顺序为pH>超声温度>乙醇浓度>料液比,超声功率对提取率的影响不大。超声法提取红豆种皮花色苷的最适工艺条件为:料液比1∶34(g/mL),pH为3,乙醇体积分数30%,超声温度55℃,超声功率350 W。在上述最佳工艺条件下,红豆种皮中花色苷的提取效果最好,提取液中花色苷含量可达(82.35±3.28)mg/100 g。

关键词：红豆种皮花色苷色素超声提取工艺

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溶剂法提取万寿菊籽油的工艺研究

化学与生物工程 2005年第12期22卷 26-28页

作者：金丽梅宋丽娜吴天法袁旭张爱武王芹黑龙江八一农垦大学食品学院黑龙江大庆163319

采用3种不同溶剂,运用索氏提取法进行了万寿菊籽油的提取实验研究。首先考察了以工业正己烷为溶剂时回流时间、回流次数对万寿菊籽油提取率的影响,确定了提取率最大时的最佳工艺条件,并与最佳条件下以乙醚和正己烷-乙醚(1∶1)作溶剂时... 详细信息

采用3种不同溶剂,运用索氏提取法进行了万寿菊籽油的提取实验研究。首先考察了以工业正己烷为溶剂时回流时间、回流次数对万寿菊籽油提取率的影响,确定了提取率最大时的最佳工艺条件,并与最佳条件下以乙醚和正己烷-乙醚(1∶1)作溶剂时的提取率进行了对比。研究结果表明:以工业正己烷为溶剂时的最佳提取条件是回流时间为7 h、回流次数为14次.h-1,以工业正己烷、乙醚、正己烷-乙醚(1∶1)为溶剂时对应提取率分别为22.53%、23.96%、25.56%。

关键词：万寿菊籽油索氏提取法溶剂法

Symmetry of Positive Solutions to the Coupled Fractional System with Isolated Singularities

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Acta Mathematica Sinica,English Series 2021年第9期37卷 1437-1452页

作者： Meng Hui li jin Chun HE Hao Yuan XU mei Hua YANG School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074P.R.China

In this paper,we consider the following two-coupled fractional Laplacian system with two or more isolated singularities(-△)^(s)u=μ1u^(2q+1)+βu^(p1-1)v^(p2)(-△)^(s)v=μ2v(2q+1+βu^p1v^p2-1)in R(n)\Λ,u>0,u>0,where s∈(0,1),n>2s and n≥2.μ1,μ2 andβare all positive constants.p1,p2>1 and p1+p2=2q+2∈((2n-2s)/(n-2s),(2n)/(n-2s)].Λ■R^(n)contains finitely many isolated *** the method of moving plane,we obtain the symmetry results for positive solutions to above system.

关键词： Fractional Laplacian system moving plane symmetry singularity

Sodium Tanshinone ⅡA Sulfonate for Coronary Heart Disease: A Systematic Review of Randomized Controlled Trials

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Chinese Journal of Integrative Medicine 2020年第3期26卷 219-226页

作者： YU mei-li li Si-ming GAO Xiang li jin-gen XU Hao CHEN Ke-ji Graduate School Beijing University of Chinese MedicineBeijing100029China Cardiovascular Diseases Center Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing100091China Tieying Hospital of Fengtai District Beijing100079China

Objective:To assess whether an adjunctive therapy of Sodium Tanshinone ⅡA Sulfonate Injection(STS)is effective and safe in improving clinical outcomes in patients with coronary heart disease(CHD).Methods:A literature search was conducted through PubMed,the Cochrane library,Knowledge Infrastructure Databases(CNKI),Chinese Biomedical literature Database(SinoMed),Chinese Science and Technology Periodical Database(VIP)and Wanfang Database up to August *** controlled trials(RCTs)comparing STS with placebo or no additional treatments on the basis of standard conventional medicine therapies were *** outcomes were all-cause mortality,major acute cardiovascular events(MACEs),cardiac function and inflammatory *** risk of bias assessment according to the Cochrane Handbook was used to evaluate the methodological quality of the included *** 5.3 software was used for data ***:A total of 22 RCTs involving 1,873 participants were *** of the trials used STS as adjunctive treatment to standard conventional medicine *** to the poor quality of methodologies of most trials,only limited evidence showed that a combination of STS with percutaneous coronary intervention(PCI)or thrombolytic therapy(TT)might be more effective on reduction of all cause death rate than TT alone[risk ratio(RR)0.25,95% confidence interval(CI)0.07 to 0.87]or PCI alone(RR 0.42,95%CI 0.04 to 4.36).The results of 6 trials comparing STS plus TT with TT alone showed that the addition of STS significantly reduced the incidence of cardiac shock(RR 0.35,95%CI 0.14 to 0.86),heart failure(RR 0.41,95% CI 0.20 to 0.83)and arrhythmia(RR 0.21,95%CI 0.12 to 0.46).STS combined with TT also showed a superior effect on cardiac function and inflammatory *** severe adverse event was reported related to ***:As an adjunctive therapy,STS combined with standard conventional medicine seems to be more effective on all-cause mortality or MACEs than conven

关键词： TanshinoneⅡA coronary heart disease meta-analysis systematic review