检索结果-南通市图书馆

基于环境空气中VOCs在线监测数据精准识别化工园区VOCs排放源

2011 International Conference on Computer Science and Information Technology(ICCSIT 2011)

作者： dong xie Jinliang Shi Guorong Chen Jianqu Zhu School of Electric & Information Engineering Chong qing University of Science and Technology Engineering Training Center Chong qing University of Science and Technology

ISBN: (纸本)9781510811249;1510811249

There is a very complex nonlinear relationship between cutting parameters and machine tools energy consumption in CNC machining process. The general formulas are very complex from experience;it needs the experience tables and complex and tedious calculations to estimate energy consumption. This paper proposes a CNC machine tool cutting process model for energy consumption based on adaptive fuzzy neural network because of its very strong nonlinear mapping ability, and then solves the model by using the genetic algorithm due to its ability for global optimization. The optimal combination of cutting parameters is verified its optimization in cutting experiment. As compared with the traditional empirical formula, the proposed method simplifies the calculation of energy consumption and provides a good energy control proposal for CNC machine tool roughing process.

关键词： CNC Machine Tool Energy Modeling Fuzzy Neural Network Genetic Algorithm

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

环境科学 2020年第11期41卷 4874-4884页

作者：孙佳宁谢绍东北京大学环境科学与工程学院北京100871

为精准识别化工园区环境空气VOCs排放源,2017年1月基于连续在线GC-FID法逐时监测某化工园区5个点环境空气中43种VOCs数据,运用统计分析法和PMF模型识别其来源,再结合CPF方法和企业排放信息达到精准化识别各排放源.结果表明,5个监测点平... 详细信息

为精准识别化工园区环境空气VOCs排放源,2017年1月基于连续在线GC-FID法逐时监测某化工园区5个点环境空气中43种VOCs数据,运用统计分析法和PMF模型识别其来源,再结合CPF方法和企业排放信息达到精准化识别各排放源.结果表明,5个监测点平均VOCs体积分数为56.40×10^-9,除一个点其余点均以烷烃含量最高,主要是乙烷、丙烷、乙烯、甲苯、异丁烷、正丁烷和乙炔;园区环境空气中VOCs来自丁烷泄漏、工艺过程中排放、储罐排放、乙烯合成和城区传输这5个来源;基于气象传输路径分析和企业排放信息,识别出园区有7家化工企业以及园区外运河装卸区是观测期间VOCs的主要排放源.本研究以在线监测数据为基础,联合受体模型、气象条件及企业排放信息,实现了化工园区内VOCs污染来源的精准化定位,为园区内企业排放的监督和管理提供依据.

关键词：挥发性有机物(VOCs) 化工园区正矩阵因子分析法(PMF) 条件概率函数(CPF) 排放源

Berberine enhances antidiabetic effects and attenuates untoward effects of canagliflozin in streptozotocin-induced diabetic mice

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2016年第7期14卷 518-526页

作者： TIAN Cai-Ming JIANG Xin OUYANG Xiao-Xi ZHANG Ya-Ou xie Wei-dong Department of chemistry Tsinghua University Shenzhen Key Lab of Health Science and Technology Division of Life Science & Health Graduate School at ShenzhenTsinghua University School of Life Sciences Tsinghua University

The present study aimed at determining whether berberine can enhance the antidiabetic effects and alleviate the adverse effects of canagliflozin in diabetes mellitus. Streptozotocin-induced diabetic mice were introduced, and the combined effects of berberine and canagliflozin on glucose metabolism and kidney functions were investigated. Our results showed that berberine combined with canagliflozin(BC) increased reduction of fasting and postprandial blood glucose, diet, and water intake compared with berberine or canagliflozin alone. Interestingly, BC showed greater decrease in blood urea nitrogen and creatinine levels and lower total urine glucose excretion than canagliflozin alone. In addition, BC showed increased phosphorylated 5' AMP-activated protein kinase(p AMPK) expression and decreased tumor necrosis factor alpha(TNFα) levels in kidneys, compared with berberine or canagliflozin alone. These results indicated that BC was a stronger antidiabetic than berberine or canagliflozin alone with less negative side effects on the kidneys in the diabetic mice. The antidiabetic effect was likely to be mediated by synergically promoting the expression of p AMPK and reducing the expression of TNFα in kidneys. The present study represented the first report that canagliflozin combined with berberine was a promising treatment for diabetes mellitus. The exact underlying mechanisms of action should be investigated in future studies.

关键词： Canagliflozin Berberine Diabetes mellitus AMP-activated protein kinase Sodium-glucose cotransporter-2

Tetrahydrobiopterin Protects against Radiation-induced Growth Inhibition in H9c2 Cardiomyocytes

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2016年第22期129卷 2733-2740页

作者： Zheng-Yi Zhang Yi Li Rui Li An-An Zhang Bo Shang Jing Yu Xiao-dong xie Department of Hypertension Lanzhou University Second Hospital Lanzhou Gansu 730030 China Department of Heart Failure Lanzhou University Second Hospital Lanzhou Gansu 730030 China Institute of Medical Genetics School of Basic Medical Sciences Lanzhou UniversityLanzhou Gansu 730000 China School of Stomatology Lanzhou University Lanzhou Gansu 730000 China

Background：Tetrahydrobiopterin （BH4） is an essential cofactor of nitric oxide synthases （NOSs） for the synthesis of nitric oxide （NO）.BH4 therapy can reverse the disease-related redox disequilibrium observed with BH4 ***,whether BH4 exerts a protective effect against radiation-induced damage to cardiomyocytes remains ***：Clonogenic assays were performed to determine the effects of X-ray on H9c2 cells with or without BH4 *** contents of lactate dehydrogenase （LDH）,superoxide dismutase （SOD）,and malondialdehyde （MDA） in H9c2 cells were measured to investigate oxidative stress *** cell cycle undergoing radiation with or without BH4 treatment was detected using flow *** expression levels of proteins in the phosphatidylinositol 3 kinase （PI3K）/protein kinase B （AKT）/P53 signaling pathway,inducible NOS （iNOS）,and endothelial NOS （eNOS） were examined using Western ***：X-ray radiation significantly inhibited the growth of H9c2 cells in a dose-dependent manner,whereas BH4 treatment significantly reduced the X-ray radiation-induced growth inhibition （control group vs.X-ray groups,respectively,P 〈 0.0 l）.X-ray radiation induced LDH release,apoptosis,and G0/G 1 peak accumulation,significantly increasing the level of MDA and the production of NO,and decreased the level of SOD （control group vs.X-ray groups,respectively,P 〈 0.05 or P 〈 0.01）.By contrast,BH4 treatment can significantly reverse these processes （BH4 treatment groups vs.X-ray groups,P 〈 0.05 or P 〈 0.01）.BH4 reversed the X-ray radiation-induced expression alterations ofapoptosis-related molecules,including B-cell lymphoma-2 （Bcl-2）,Bcl-2 associated X protein,and caspase-3,and molecules of the PI3K/Akt/P53 signaling ***4 enhanced the production of NO in 2 Gy and 4 Gy radiated groups by upregulating eNOS protein expression and downregulating iNOS protein ***：BH4 treatment can protect against X-ray-induced cardiomyocyte injury,p

关键词： Endothelial Nitric Oxide Synthase Oxidative Stress Proliferation Radiation-induced Heart Disease Tetrahydrobiopterin

在线全文

学校读者我要写书评

暂无评论

套筒天线组成的宽带干涉仪测向圆阵研究

宇航学报 2006年第2期27卷 250-255页

作者：何山红谢继东南京电子技术研究所南京210013 南京邮电学院通信工程系南京210003

为提高宽带干涉仪测向圆阵性能,首次提出了利用套筒天线代替常规加载宽带偶极子作为测向阵列单元。利用Fourier变换结合矩量法分析了套筒天线组成的测向圆阵的电磁特性,并利用HFSS软件对部分仿真结果进行了验证。在得出阵列电磁特性的... 详细信息

为提高宽带干涉仪测向圆阵性能,首次提出了利用套筒天线代替常规加载宽带偶极子作为测向阵列单元。利用Fourier变换结合矩量法分析了套筒天线组成的测向圆阵的电磁特性,并利用HFSS软件对部分仿真结果进行了验证。在得出阵列电磁特性的基础上再运用基于空间距离的相关数据处理方法统计分析了测向圆阵性能。研究结果表明,相对于常规测向圆阵,由于套筒天线构成的测向圆阵增益高、消除了广义谐振现象,使测向圆阵的灵敏度、测向精度均得到较大提高。相应地模糊度减小、稳健性能增强。

关键词：套筒天线干涉仪测向圆阵矩量法 Fourier变换相关数据处理

QUANTITATIVE ANALYSIS OF VERY WEAK ACID AND BASE BY pH-FIXED TITRATION METHOD

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1990年第1期1卷 81-84页

作者： Gang XU Ping WEI Yu Cheng xie Xing dong YU(Jiangsu Institute of Chemical Technology,Changzhou,213016)

pH-fixed titration method for the determination of weak acids and bases has been studied in this *** is not necessary to know the ionization constant of weak acid or base and the concentration of titrant. This method had been applied to determine phenol,4-aminoantipyrine and glycine,whose ionization constants range from 10^(-10)to 10^(-12).The results were satisfactory.

关键词： AATP acid QUANTITATIVE ANALYSIS OF VERY WEAK ACID AND BASE BY pH-FIXED TITRATION METHOD ACID pH

Preliminary results of combined carotid endarterectomy and off-pump coronary artery bypass grafting in patients with coexistent carotid and coronary artery diseases

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第24期122卷 2951-2955页

作者： CHEN Xu-jun CHEN Xin xie dong-hua SHI Kai-hu XU Ming Department of Thoracic and Cardiovascular Surgery Nanjing First Hospital Affiliated to Nanjing Medical University Nanjing Jiangsu 210006 China Division of Cardiovascular Medicine Department of Medicine Duke University Medical Center Durham USA

Background Coexistent carotid and coronary artery diseases are common and patients with them remain at a high risk for perioperative stroke or myocardial infarction after coronary bypass surgery. The aim of this study was to investigate the effect of combined carotid endarterectomy （CEA） and off-pump coronary artery bypass grafting （CABG） in patients with coexistent carotid and coronary artery diseases. Methods Between January 2002 and December 2007, consecutive patients with coexistent carotid and coronary artery diseases underwent one-stage unilateral CEA and off-pump CABG in Heart Institute of Nanjing First Hospital Affiliated to Nanjing Medical University. Perioperative complications were assessed and follow-up was carried out. Results A total of 51 cases of isolated off-pump CABG and unilateral CEA, including 34 right and 17 left, were performed. The mean blocked time of carotid artery in CEA was （25.5_±7.0） minutes. The mean number of distal grafts per patient was 3.30±0.45. The mean ventilation time, intensive care unit stay, and postoperative hospital stay was （11.3±5.4） hours, （2.1±0.9） days, and （12.5±6.1） days respectively. None of the patients had stroke or myocardial infarct. There was one perioperative death due to acute cardiac failure, resulting in an operative mortality of 1.96%. Follow-up was completed for 47 patients （92.16%） with a mean follow-up of （39.5±12.5） months. None of the patients manifested stroke, new angina or newly developed cardiac infarct. No late death occurred. Conclusion Combined CEA and off-pump CABG is a safe and effective procedure in selected patients with coexistent carotid and coronary artery diseases.

关键词： coronary artery bypass, off-pump endarterectomy, carotid, coronary artery disease carotid stenosis

在线全文

学校读者我要写书评

暂无评论

CDMA无线多媒体网络中蜂窝间干扰分析

电子与信息学报 2008年第5期30卷 1159-1162页

作者：谢胜东吴蒙南京邮电大学通信与信息工程学院南京210003

蜂窝间干扰分析是CDMA无线通信网络中研究的一个重要方面,但干扰分析的传统方法存在3个主要缺陷,不能准确地反映蜂窝系统的实际情况。该文提出了一种新的计算蜂窝间干扰的分析方法,该方法克服了传统方法中存在的3个不足之处。用该方法... 详细信息

蜂窝间干扰分析是CDMA无线通信网络中研究的一个重要方面,但干扰分析的传统方法存在3个主要缺陷,不能准确地反映蜂窝系统的实际情况。该文提出了一种新的计算蜂窝间干扰的分析方法,该方法克服了传统方法中存在的3个不足之处。用该方法对蜂窝间干扰进行了定量计算,得到了干扰均值和方差的解析表达式。最后通过数值计算,对不同环境下的干扰进行了分析。结果表明,随着蜂窝间距离的增加,干扰值下降的速率不断减少。

关键词： CDMA网络干扰均值方差

在线全文

学校读者我要写书评

暂无评论

高职院校履行社会服务职能的机制与载体研究

职业技术教育 2013年第32期34卷 63-66页

作者：谢冬苏州经贸职业技术学院江苏苏州215009

高职院校服务社会研究正日益受到重视,但还存在着内涵不丰富和机制缺失的不足。因此,界定服务社会内涵、机制与载体,有助于高职院校履行社会服务职能。高职院校社会服务的内涵应包括经济咨询服务和社会公共服务两方面;其长效机制涵盖外... 详细信息

高职院校服务社会研究正日益受到重视,但还存在着内涵不丰富和机制缺失的不足。因此,界定服务社会内涵、机制与载体,有助于高职院校履行社会服务职能。高职院校社会服务的内涵应包括经济咨询服务和社会公共服务两方面;其长效机制涵盖外部政府、行业企业支持机制和高职院校内部各项职能;其载体主要有高教园区与产业园/科技园对接、院校与社区对接和院校自办科技园三种模式。

关键词：高职院校社会服务机制载体