检索结果-南通市图书馆

Chemoselective Catalytic Hydrogenation of α,β-Unsaturated Ketones and α,β-Unsaturated Carboxylic Esters

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1998年第2期14卷 17-22页

作者： ZHANG Jing-wen ZHAO Jian-zhang ZHANG Xiao-long JIANG Yu-lin ma xiu-li SUN Yun-xiu JIANG Wen-pu li Yao-xian XU Zhi-luo Department of Chemistry Jilin UniversityChangchun130023

The effect of catalysts P-2 00-Ni(Nickel boride) and P-2 00-Ni-M(M: Co, Fe, Cu, Sn), prepared by adopting a modified recipe, on the chemoselective hydrogenation of carbon carbon double bonds in α,β- unsaturated ketones, and the activity of catalysts P-1.80-Ni, P-2 00-Ni or P-1.80(2 00) -Ni-M(M: Pd, Co, Cu) in the selective hydrogenation of carbon carbon double bonds in α,β-unsaturated carboxylic esters, were investigated systematically. According to the experimental results, the selectivities of these catalysts toward the hydrogenation of the carbon carbon double bonds of α,β-unsaturated keones or α,β-unsaturated carboxylic esters are 96%—100% or 100%, respectively.

关键词： α β-Unsaturated ketone Nickel boride α β-Unsaturated carboxylic ester

Studies　on　Ester　Exchange　Reaction

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1998年第1期14卷 38-41页

作者： Zhang, Jing-wen Zhang, Xiao-long ma, xiu-li liu, Chang-cheng Mu, Ying Sun, Yun-xiu Jiang, Wen-pu Huang, Hua-min li, Yao-xian Peng, Wan-ru Jilin Univ Dept Chem Changchun 130023 Peoples R China Changchun Higher Coll Med Sci Dept Pharmacol Changchun 130023 Peoples R China

ＳｔｕｄｉｅｓｏｎＥｓｔｅｒＥｘｃｈａｎｇｅＲｅａｃｔｉｏｎＺＨＡＮＧＪｉｎｇ－ｗｅｎ，ＺＨＡＮＧＸｉａｏ－ｌｏｎｇ，ＭＡＸｉｕ－ｌｉ，ＬＩＵＣｈａｎｇ－ｃｈｅｎｇ，ＭＵＹｉｎｇ，ＳＵＮＹｕｎ－ｘｉｕ，ＪＩＡＮＧＷｅ... 详细信息

ＳｔｕｄｉｅｓｏｎＥｓｔｅｒＥｘｃｈａｎｇｅＲｅａｃｔｉｏｎＺＨＡＮＧＪｉｎｇ－ｗｅｎ，ＺＨＡＮＧＸｉａｏ－ｌｏｎｇ，ＭＡＸｉｕ－ｌｉ，ＬＩＵＣｈａｎｇ－ｃｈｅｎｇ，ＭＵＹｉｎｇ，ＳＵＮＹｕｎ－ｘｉｕ，ＪＩＡＮＧＷｅｎ－ｐｕ，ＨＵＡＮＧＨｕａ－ｍｉｎ...

关键词： Reaction Studies Exchange Ester

在线全文

学校读者我要写书评

暂无评论

基于分水岭-谱聚类的SAR图像分割

红外与毫米波学报 2008年第6期27卷 452-456页

作者：马秀丽焦李成上海大学通信与信息工程学院上海200072 西安电子科技大学智能信息处理研究所陕西西安710071

由于谱聚类是基于图论的、以相似性为基础的聚类方法,需要计算图像中每对像素点之间的相似性.当图像很大时,计算相似性矩阵和求解相应的特征值、特征向量是很困难和耗时的.为此,针对合成孔径雷达(SAR)图像的特点,提出了一个两阶段的图... 详细信息

由于谱聚类是基于图论的、以相似性为基础的聚类方法,需要计算图像中每对像素点之间的相似性.当图像很大时,计算相似性矩阵和求解相应的特征值、特征向量是很困难和耗时的.为此,针对合成孔径雷达(SAR)图像的特点,提出了一个两阶段的图像分割方法,首先采用分水岭算法对图像进行过分割,然后再用改进的谱聚类算法进行聚类.新方法不仅可以减少噪声对分割结果的影响,很好地保持图像边缘,而且对时间要求较高的应用也具有一定的参考价值.为了验证新方法的有效性,将其用于SAR图像分割,取得了较优的分割结果.

关键词：谱聚类算法分水岭 SAR图像分割

magnetron sputtered nickel oxide with suppressed interfacial defect states for efficient inverted perovskite solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 348-355页

作者： Guoqiang ma Qin Tan Zhaoning li Jingwei xiu Jiafeng Wang Tianle Cheng Dong He Qiang Sun Xuhang ma Francesco Lamberti Zhubing He Department of materials Science and Engineering Institute of Innovative Materials (I2M) Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG)Southern University of Science and Technology (SUSTech) Core Research Facilities Southern University of Science and Technology Department of Chemical Sciences Department of Industrial Engineering University of Padova

Widely used spin-coated nickle oxide （NiOx） based perovskite solar cells often suffer from severe interfacial reactions between the NiOxand adjacent perovskite layers due to surface defect states,which inherently impair device performance in a long-term view,even with surface molecule *** this study,we developed high-quality magnetron-sputtered NiOxthin films through detailed process optimization,and compared systematically sputtered and spin-coated NiOxthin film surfaces from materials to *** sputtered NiOxfilms exhibit improved crystallinity,smoother surfaces,and significantly reduced Ni3+or Ni vacancies compared to their spin-coated ***,the interface between the perovskite and sputtered NiOxfilm shows a substantially reduced density of defect *** solar cells （PSCs） fabricated with our optimally sputtered NiOxfilms achieved a high power conversion efficiency （PCE） of up to 19.93%and demonstrated enhanced stability,maintaining 86.2% efficiency during 500 h of maximum power point tracking under one standard sun ***,with the surface modification using (4-(2,7-dibromo-9,9-dimethylacridin-10（9H）-yl)butyl)p hosphonic acid （DmacPA）,the device PCE was further promoted to 23.07%,which is the highest value reported for sputtered NiOxbased PSCs so far.

关键词： Perovskite

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

联合模型初始化独立谱聚类算法

西安电子科技大学学报 2007年第5期34卷 768-772,808页

作者：马秀丽焦李成西安电子科技大学智能信息处理研究所陕西西安710071

针对原始谱聚类算法初始化敏感的缺点,提出了一种基于联合模型的初始化独立谱聚类算法并将其用于图像分割.通过引入联合模型可以充分利用待聚类数据所包含的空间邻近信息和特征相似性信息,得到更精确的聚类结果;通过引入K-调和平均算法... 详细信息

针对原始谱聚类算法初始化敏感的缺点,提出了一种基于联合模型的初始化独立谱聚类算法并将其用于图像分割.通过引入联合模型可以充分利用待聚类数据所包含的空间邻近信息和特征相似性信息,得到更精确的聚类结果;通过引入K-调和平均算法克服了原始谱聚类算法对初始化的敏感性,从而得到更稳定的聚类性能.最后,通过对纹理图像和合成孔径雷达图像分割验证了新算法的有效性.

关键词：谱聚类算法联合模型 K-调和平均算法合成孔径雷达图像分割

Chemical　Studies　on　the　Glycosides　in　the　Leaves　of　Oplopanax　Elatus　Nakai(Ⅳ)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 1997年第1期13卷 36-40页

作者： WANG Guang shu and XU Jing da (Norman Bethune University of Medical Sciences, Changchun, 130021) ma xiu li, SUN Yun xiu and liU Ju zheng (Department of Chemistry, Jilin University, Changchun, 130023) Tetsuya Murayama and Junzo Shoji (Schoo NORmaN BETHUNE UNIV MED SCI CHANGCHUN 130021PEOPLES R CHINA JIliN UNIV DEPT CHEMCHANGCHUN 130023PEOPLES R CHINA SHOWA UNIV SCH PHARMACEUT SCITOKYO 142JAPAN

The further investigation of the chemical constituents of the leaves of Oplopanax elatus Nakai led to the isolation of two new triterpenoid saponins, named Cirensenosides M(1) and N(2). The structures of the two saponins were elucidated as 3 α hydroxyolean 9(11), 12 diene 28 oic acid 28 O α L rhamnopyranosyl (1→4) β D glucopyranosyl (1→6) β D glucopyranoside(1) and 3 α hydroxyolean 11,13(18) diene 28 oic acid 28 O α L rhamnopyranosyl (1→4) β D glucopyranosyl(1→6) β D glucopyranoside(2), respectively.

关键词： Oplopanax elatus Araliaceae Saponin Cirensenoside

Cloning and Overexpression of CYP6F1,a Cytochrome P450 Gene,from Deltamethrin-resistant Culex pipiens pallens

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2005年第5期37卷 317-326页

作者： mao-Qing GONG Yan GU Xiao-Bang HU Yan SUN Lei ma xiu-Lan li li-Xin SUN Jing SUN Jin QIAN Chang-liang ZHU Department of Pathogenic Biology, Nanjing Medical University: Key Laboratory of Modern Pathogenic Biology of Jiangsu Province, Nanjing 210029, China Department of Pathogenic Biology Nanjing Medical University Key Laboratory of Modern Pathogenic Biology of Jiangsu ProvinceNanjing 210029 China

CYP6F1(GenBank/EMBL accession ***662654),a novel gene with a complete encodingsequence in the cytochrome P450 family 6,was cloned and sequenced from deltamethrin-resistant 4thinstar larvae of Culex pipiens *** cDNA sequence of CYP6F1 has an open reading frame of 1527bp,which encodes a putative protein of 508 amino acid *** deduced amino acid sequence ofCYP6F1 indicated that the encoded P450 has conserved domains of a putative membrane-anchoring signal,putative reductase-binding sites,a typical heme-binding site,an ETLR motif and substrate recognition ***-quantitative RT-PCR analysis indicated that the CYP6F1 gene was expressed to a greater extent in thedeltamethrin-resistant strain than in the susceptible strain of *** *** expression levels ofthe CYP6F1 gene in the deltamethrin-resistant 1 st,2nd,3rd,4th instar larvae and adult female mosquitoesdiffered,with highest expression levels in the 4th instar *** addition,the CYP6F1 gene was stablyexpressed in mosquito C6/36 cells,and the expected 61.2 kDa band was identified by Western *** transfected with CYP6F1 had an increased resistance to deltamethrin as compared with control *** results indicate that CYP6F1 is expressed at higher levels in the deltamethrin-resistant strain,and mayconfer some insecticide resistance in *** pallens.

关键词： Culex pipiens pallens insecticide resistance cytochrome P450 RT-PCR

Improving outcomes in patients with heart failure:The contribution of cardiovascular specialist nurses

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

South China Journal of Cardiology 2023年第4期24卷 182-187页

作者： WANG Xiao-li LU Xiao-ying ma xiu-li QIN ling-ling Heart Center Beijing Chaoyang Hospital Capital Medical UniversityBeijing 100020China

Background Heart failure(HF)is a chronic,impactful condition on individuals and healthcare systems,requiring management that goes beyond inpatient *** study investigated the impact of cardiovascular specialist nurses on long-term health outcomes and patient satisfaction in HF outpatient *** In a year-long observational study from July 2021 to July 2022,230 HF patients at our hospital were divided into an experimental group(n=115)receiving care from cardiovascular specialist nurses and a control group(n=115)managed by general nursing *** interventions included comprehensive care such as patient education,medication management,lifestyle guidance,symptom monitoring,and psychological *** major adverse cardiovascular events(maCEs)and rehospitalization rates were applied as the primary *** The experimental group demonstrated significantly fewer maCEs and lower rehospitalization rates compared to the control group(Plist nurses in HF outpatient care significantly enhances clinical outcomes and patient *** nurses play a key role in bridging the transition from hospital to home care,improving adherence to treatment regimens,and reducing healthcare system burdens.

关键词： Heart failure Cardiovascular specialist nurses Outpatient care Health outcomes Patient satisfaction Chronic disease management

在线全文

学校读者我要写书评

暂无评论

基于免疫克隆算法的协同神经网络参数优化

红外与毫米波学报 2007年第1期26卷 38-42页

作者：马秀丽刘芳焦李成西安电子科技大学智能信息处理研究所陕西西安710071 西安电子科技大学计算机学院陕西西安710071

针对现有协同神经网络参数优化方法的不足,提出了一种基于免疫克隆算法的参数优化方法.与在平衡注意参数条件下的算法和在不平衡注意参数条件下基于遗传算法和模拟退火算法的优化方法相比,新方法具有全局兼局部寻优能力,不易陷入局部极... 详细信息

针对现有协同神经网络参数优化方法的不足,提出了一种基于免疫克隆算法的参数优化方法.与在平衡注意参数条件下的算法和在不平衡注意参数条件下基于遗传算法和模拟退火算法的优化方法相比,新方法具有全局兼局部寻优能力,不易陷入局部极值,并且迭代步长是自适应调整的.对纹理图像与遥感图像的分类识别结果表明:新方法不仅具有更快的收敛速度而且具有更优的分类识别性能,同时验证了注意参数及所有参数对各原型模式之间竞争态势的影响,从而达到更佳的分类识别效果.

关键词：协同神经网络注意参数免疫克隆算法图像分类