检索结果-南通市图书馆

pH-controlled assembly of two supramolecular architectures based on Cu（Ⅱ）-metallacycle building blocks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

pH-controlled assembly of two supramolecular architectures b...

存在球差和失焦下电子光学传递函数和脉冲响应函数

中国化学会第五届全国结构化学学术会议

作者： Lei Zhang jian Zhang Zhao-ji Li ye-yan Qin and Yuan-Gen Yao~*State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,The Chinese Academy of Sciences,Fuzhou,Fujian 350002,People''s Republic of China.

＜正＞The design and construction of supramolecular architectures with coordination bonds and hydrogen bonds has attracted great attention in recent *** the various families of these supramolecular materials,the family of closed,ring-like coordination complexes such as metallacrowns and metallacycles is an important one,owing to their potential applications in

关键词：

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

物理学报 1985年第3期 348-358页

作者：西门纪业晏继文黄旭北京大学无线电电子学系

根据电子光学理论,球差和失焦引起附加相位移为γ,相干的振幅和相位衬度传递函数为cosγ和sinγ。它们的傅里叶逆变换给出脉冲响应函数的实部和虚部。本文讨论了cosγ和sinγ的零点和极值点,这些点将衍射平面划分为一系列环带。证明了... 详细信息

根据电子光学理论,球差和失焦引起附加相位移为γ,相干的振幅和相位衬度传递函数为cosγ和sinγ。它们的傅里叶逆变换给出脉冲响应函数的实部和虚部。本文讨论了cosγ和sinγ的零点和极值点,这些点将衍射平面划分为一系列环带。证明了当无量纲失焦量Δ=N1/2（N为正整数）时各环带上cosγ,sinγ的积分相同,即对脉冲响应函数中心值的贡献相同。本文讨论了使cosγ或sinγ的积分取极大值或极小值,亦即使脉冲响应函数中心值或中心强度取极大值或极小值的条件。本文还讨论了脉冲响应函数最佳均方逼近理想的Airy分布的条件。

关键词：光学传递函数零点实部光学转移函数点(数学) 脉冲响应函数极值点球差极小值点扩散函数极大值中心值傅里叶逆变换

Synthesis of chiral phosphine derivatives through a copper（I）-catalyzed desymmetric SNAr reaction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Shuai Zhang Pei-Zhi Liu yan-Bo Li Qi Zhang Jun-Zhao Xiao Yi-Fan Wang Tian-Yu Wei jia-Wei jiang ye Wang Qian Peng Liang Yin Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences State Key Laboratory of Elemento-Organic Chemistry and Tianjin Key Laboratory of Biosensing and Molecular Recognition College of Chemistry Frontiers Science Center for New Organic Matter Nankai University Haihe Laboratory of Sustainable Chemical Transformations

Axially chiral phosphines are a class of extremely important ligands in asymmetric catalysis. Herein, an unprecedented copper（I）-catalyzed asymmetric SNAr reaction with HP（S）R2is uncovered, which delivers a series of axially chiral phosphine derivatives in high yields with excellent enantioselectivity. Furthermore, the diastereoselective reaction with the kinetic resolution of racemic HP（S）ArR proceeds smoothly, providing the products with moderate diastereoselectivity and excellent enantioselectivity. Control experiments indicate that HP（S）Ph2is much more active than HPPh2and HP（O）Ph2as the pronucleophile in the present reaction. It is found that the SNAr reaction （the first SNAr） proceeds in a desymmetric manner, providing the desired chiral products while a continued SNAr reaction （the second SNAr） slightly occurs in a kinetic resolution manner in the present catalytic system, which enhances the ee of the desired chiral products. DFTcalculations support a concerted reaction pathway rather than a step-wise mechanism. Finally, axially chiral olefin-phosphines produced by the present method work as suitable ligands in Pdcatalyzed asymmetric allylic substitution with C-, N-, and O-nucleophiles and Rh-catalyzed asymmetric addition of arylboronic acid to benzil.

关键词：

Calibration of line structured light vision system based on camera’s projective center

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光学精密工程 2005年第5期13卷 584-591页

作者： ZHU ji-gui LI yan-jun ye Sheng-hua State Key Laboratory of Precision Measuring Technology and Instrument Tianjin Universality Tianjin 300072China

Based on the characteristics of line structured light sensor, a speedy method for the calibration was established. With the coplanar reference target, the spacial pose between camera and optical plane can be calibrated by using of the camera’s projective center and the light’s information in the camera’s image surface. Without striction to the movement of the coplanar reference target and assistant adjustment equipment, this calibration method can be implemented. This method has been used and decreased the cost of calibration equipment, simplified the calibration procedure, improved calibration efficiency. Using experiment, the sensor can attain relative accuracy about 0.5%, which indicates the rationality and effectivity of this method.

关键词：投影中心线性结构光传感器标度可视性系统

C_2H, HC_3N and HNC observations in OMC-2/3

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2011年第6期11卷 671-678页

作者： Qiang Liu ji yang yan Sun ye Xu Purple Mountain Observatory Chinese Academy of Science Nanjing 210008 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

For the first time, the OMC-2/3 region was mapped in C2H （1–0）, HC3N （10–9） and HNC （1–0） lines. In general, the emissions from all the three molecular species reveal an extended filamentary structure. The distribution of C2H cores almost follows that of the 1300μm condensations, which might suggest that C2H is a good tracer to study the core structure of molecular clouds. The core masses traced by HNC are rather ？at, ranging from 18.8 to 49.5 M , while also presenting a large span for those from C2H, ranging from 6.4 to 36.0 M . The line widths of both HNC and C2H look very similar, and both are wider than that of HC3N. The line widths of the three lines are all wider than those from dark clouds, implying that the former is more active than the latter, and has larger turbulence caused by winds and UV radiation from the surrounding massive stars.

关键词： ISM: abundances-ISM: individual (Orion Molecular Clouds)-ISM: molecules-stars: formation

Effects of endogenous dopamine induced by low concentration atropine eye drops on choroidal neovascularization in high myopia mice

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2023年第7期16卷 1034-1040页

作者： yan-yan ji Shi-Xi Zhang ye Kang Song Chen Clinical College of Ophthalmology Tianjin Medical UniversityTianjin 300020China Tianjin Eye Hospital Tianjin 300020China Liaocheng Aier Eye Hospital Liaocheng 252100Shandong ProvinceChina Dezhou Aier Eye Hospital Dezhou 253000Shandong ProvinceChina yanTai Aier Eye Hospital Yantai 264000Shandong ProvinceChina

AIM:To evaluate effects of endogenous dopamine induced by low concentration atropine eye drops on choroidal neovascularization(CNV)in high myopia ***:The C57BL/6J mice were deprived of the right eye for 4wk,and the high myopia was diagnosed by optometry,the diopter was less than-6.00 D,and CNV was induced by 532 nm *** changes of dopamine D1 receptor(DRD1),dopamine D2 receptor(DRD2),and vascular endothelial growth factor A(VEGFA)were detected by Western blot technology at 0.5,1,2h,and 7d after 0.01%,0.05%,and 0.1%atropine eye drops,respectively,the area of CNV was ***:Significant increases were observed on the expression of DRD2 in mouse high myopia model at 0.5,1,2h,7d with 0.05%and 0.1%atropine eye drops(Pye drops(Pye drops can decrease the level of VEGFA and inhibit high myopia CNV indirectly by up-regulating the level of DRD2 and down-regulating the level of DRD1,and the effect of 0.05%and 0.1%atropine eye drops is more significant.

关键词： high myopia choroidal neovascularization low concentration atropine eye drops dopamine D1 receptor dopamine D2 receptor

Families of Dothideomycetes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fungal Diversity 2013年第6期63卷 1-313页

作者： Kevin D.Hyde E.B.Gareth Jones jian-Kui Liu Hiran Ariyawansa Eric Boehm Saranyaphat Boonmee Uwe Braun Putarak Chomnunti Pedro W.Crous Dong-Qin Dai Paul Diederich Asha Dissanayake Mingkhuan Doilom Francesco Doveri Singang Hongsanan Ruvishika Jayawardena James D.Lawrey yan-Mei Li Yong-Xiang Liu Robert Lücking Jutamart Monkai Lucia Muggia Matthew P.Nelsen Ka-Lai Pang Rungtiwa Phookamsak Indunil C.Senanayake Carol A.Shearer Satinee Suetrong Kazuaki Tanaka Kasun M.Thambugala Nalin N.Wijayawardene Saowanee Wikee Hai-Xia Wu Ying Zhang Begoña Aguirre-Hudson S.Aisyah Alias AndréAptroot Ali H.Bahkali Jose L.Bezerra D.Jayarama Bhat Erio Camporesi Ekachai Chukeatirote Cécile Gueidan David L.Hawksworth Kazuyuki Hirayama Sybren De Hoog ji-Chuan Kang Kerry Knudsen Wen-jing Li Xing-Hong Li Zou-Yi Liu Ausana Mapook Eric H.C.McKenzie Andrew N.Miller Peter E.Mortimer Alan J.L.Phillips Huzefa A.Raja Christian Scheuer Felix Schumm Joanne E.Taylor Qing Tian Saowaluck Tibpromma Dhanushka N.Wanasinghe Yong Wang jian-Chu Xu Supalak Yacharoen ji-ye yan Min Zhang Key Laboratory for Plant Biodiversity and Biogeography of East Asia(KLPB) Kunming Institute of BotanyChinese Academy of ScienceKunming 650201Yunnan China World Agroforestry Centre East Asia NodeHeilongtanKunming 650201China Institute of Excellence in Fungal Research Chiang Rai 57100Thailand School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand Institute Ocean Earth Sciences Kuala Lumpur 50603SelangorMalaysia Department of Botany and Microbiology King Saudi UniversityRiyadhSaudi Arabia 42 Longacre Drive LivingstonNJ 07039USA Institut für Biologie Bereich Geobotanik und Botanischer GartenHerbariumMartin-Luther-UniversitätNeuwerk 2106099 Halle(Saale)Germany CBS-KNAW Fungal Biodiversity Centre Uppsalalaan 83584CT UtrechtThe Netherlands Musée National d’histoire Naturelle 25 rue Munster2160 LuxembourgLuxembourg Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry SciencesBeijing 100097People’s Republic of China Via dei Funaioli 22 57126 LivornoItaly Department of Environmental Science and Policy George Mason University4400 University DriveFairfaxVA 22030-4444USA International Fungal Research and Development Centre Key Laboratory of Resource Insect Cultivation&Utilization State Forestry AdministrationKunming 650224People’s Republic of China The Research Institute of Resource Insects Chinese Academy of ForestryKunming 650224People’s Republic of China Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesGuiyangGuizhou 550006People’s Republic of China Science and Education Integrative Research(Botany)The Field Museum1400 South Lake Shore DriveChicagoIL 60605-2496USA Institute of Plant Sciences University of GrazHolteigasse 68010 GrazAustria Department of Life Science University of TriesteVia L.Giorgieri 10TriesteItaly Committee on Evolutionary Biology University of Chicago1025 E.57th StreetChicagoIL 60637USA Institute ofMarine Biology and Center of Excellence for the Oceans Taiwan

Dothideomycetes comprise a highly diverse range of fungi characterized mainly by asci with two wall layers(bitunicate asci)and often with fissitunicate *** species are saprobes,with many asexual states comprising important plant *** are also endophytes,epiphytes,fungicolous,lichenized,or lichenicolous *** occur in terrestrial,freshwater and marine habitats in almost every part of the *** accept 105 families in Dothideomycetes with the new families Anteagloniaceae,Bambusicolaceae,Biatriosporaceae,Lichenoconiaceae,Muyocopronaceae,Paranectriellaceae,Roussoellaceae,Salsugineaceae,Seynesiopeltidaceae and Thyridariaceae introduced in this *** family is provided with a description and notes,including asexual and asexual states,and if more than one genus is included,the type genus is also *** family is provided with at least one figure-plate,usually illustrating the type genus,a list of accepted genera,including asexual genera,and a key to these genera.A phylogenetic tree based on four gene combined analysis add support for 64 of the families and 22 orders,including the novel orders,Dyfrolomycetales,Lichenoconiales,Lichenotheliales,Monoblastiales,Natipusillales,Phaeotrichales and *** paper is expected to provide a working document on Dothideomycetes which can be modified as new data comes to *** is hoped that by illustrating types we provide stimulation and interest so that more work is carried out in this remarkable group of fungi.

关键词： Acrospermales Asterinales Botryosphaeriales Capnodiales Dothideales Dyfrolomycetales Hysteriales Jahnulales Lichenoconiales Lichenotheliales Microthyriales Monoblastiales Myriangiales Mytilinidiales Natipusillales Patellariales Phaeotrichales Phylogeny Pleosporales Strigulales Taxonomy Trypetheliales Tubeufiales Type species Venturiales

Esophagogastric devascularization without splenectomy in portal hypertension: safe and effective?

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2015年第3期14卷 276-280页

作者： yan-Bin Ni Peng-ji Gao Dong Wang Zhao Li ji-ye Zhu Department of Hepatobiliary Surgery Peking University People's Hospital

BACKGROUND： Esophagogastric variceal hemorrhage is a life-threatening complication of portal hypertension. In this study, we compared the therapeutic effect of a novel surgi- cal procedure, esophagogastric devascularization without splenectomy （EDWS）, with the widely used modified esopha- gogastric devascularization （MED） with splenectomy for the treatment of portal hypertension.

关键词： portal hypertension esophagogastric devascularization without splenectomy portal vein system thrombosis

Synthesis,Growth Mechanism,and Applications of Zinc Oxide Nanomaterials

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2008年第4期24卷 457-472页

作者： Shulin ji Changhui ye Anhui Key Laboratory of Nanomaterials and Technology and Key Laboratory of Materials Physics Institute of SolidState Physics Chinese Academy of Sciences Hefei 230031 China

This article reviews recent progresses in growth mechanism, synthesis, and applications of zinc oxide nano-materials （mainly focusing on one-dimensional （1D） nanomaterials）. In the first part of this article, we briefly introduce the importance, the synthesis methods and growth mechanisms, the properties and applications of ZnO 1D nanomaterials. In the second part of this article, the growth mechanisms of ZnO 1D nanomaterials will be discussed in detail in the framework of vapor-liquid-solid （VLS）, vapor-solid （VS）, and aqueous solution growth （ASG） approaches. Both qualitative and quantitative information will be provided to show how a controlled synthesis of ZnO 1D nanomaterials can be achieved. In the third part of this article, we present recent progresses in our group for the synthesis of ZnO 1D nanomaterials, and the results from other groups will only be mentioned briefly. Especially, experiment designing according to theories will be elaborated to demonstrate the concept of controlled synthesis. In the fourth part of this article, the properties and potential applications of ZnO 1D nanomaterials will be treated. Finally, a summary part will be presented in the fifth section. The future trend of research for ZnO 1D nanomaterials will be pointed out and key issues to be solved will be proposed.

关键词： Zinc Oxide One-dimensional Nanomaterials Controlled synthesis