检索结果-南通市图书馆

A New Tetra-nuclear Nd(Ⅲ) Coordination Polymer Based on Linear Azide and Isonicotinate Anions: Synthesis, Thermal Stability and Near-infrared Luminescent Properties

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第11期39卷 2046-2052页

作者： zhong Zhi-Guo LI jing FENG Yu-quan College of Chemistry and Pharmacy Engineering Nanyang Normal UniversityNanyang 473061China

A novel tetra-nuclear Nd(Ⅲ) coordination polymer, Nd4(μ3-OH)4(μ2-H2O)2(C6H4NO2)6(N3)2(H2O)2(1, C6H4N zide anion), was successfully prepared under hydrothermal conditions and fully characterized by C, H and N elemental analysis, IR spectrum, thermal stability and single-crystal X-ray diffraction. It crystallizes in the triclinic system, space group P1, with Z = 1, a = 8.188(3), b = 12.516(5), c = 12.573(5) ?, α = 107.887(1)°, β = 104.681(2)°, γ = 98.086(6)°, V = 1152.2(8) ?3, M3 r = 1533.73, Dc = 2.210 g/cm, λ = 0.71073 ?, μ = 4.524 mm-1, F(000) = 736, R = 0.0332 and wR = 0.0901 for 3954 observed reflections with Ⅰ > 2σ(Ⅰ) and S = 1.071. The molecular structure of polymer 1 is constructed by four Nd3+ cations, four bridging μ3-OH- anions, two bridging μ2-H2 O, six C6 H4 NO2- anions, two linear azide anions and two coordinated water molecules. The structure of polymer 1 can be viewed as a 3-D supra-molecular network constructed by O-H···O and O-H···N hydrogen bonds between the adjacent chains. Moreover, its near-infrared luminescence and luminescence quenching for Cu2+ cation have also been investigated in detail.

关键词： tetra-nuclear Nd(Ⅲ)polymer linear azide anion thermal stability near-infrared fluorescent properties

Synthesis, Structure, Fluorescence and Magnetic Properties of a New Binuclear Cobalt (Ⅱ) Complex Containing Three Kinds of Ligands

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第6期39卷 1070-1076页

作者： FENG Yu-quan zhong Zhi-Guo LI jing College of Chemistry and Pharmacy Engineering Nanyang Normal UniversityNanyang 473061China

A new binuclear cobalt(Ⅱ)complex,[Co2(C10H6NO2)2(C12H8N2)2(N3)2]·H2O(1,C10H6NO2-:isoquinoline-1-carboxylate,C12H8N2:1,10-phenanthroline(phen);N3-:azide),has been synthesized though a mixed-solvothermal method using the pentanol and distilled water as *** complex was characterized by elemental analysis,IR spectrum and single-crystal X-ray *** crystallizes in triclinic system,space group P1 with Z=2,a=1.777(5),b=11.815(5),c=17.141(7)?,α=74.496(6)°,β=70.537(6)°,γ=67.861(6)°,V=2055.4(14)?3,Mr=922.66,Dc=1.491 g/cm3,λ=0.71073?,μ=0.870 mm-1,F(000)=942,R=0.0455 and wR=0.1147 for 4960 observed reflections with I>2σ(I)and S=*** molecular structure is constructed by two Co2+cations,two chelating phen ligands,two chelating isoquinoline-1-carboxylate ligands,two bridging linear azide anions and two uncoordinated half-occupied water *** 3-D supramolecular network results from the multiple hydrogen bonds andπ-πstacking interactions among three types of *** importantly,its thermal stability,luminescent properties and magnetic properties have also been studied in detail.

关键词： binuclear cobalt(Ⅱ)complex thermal stability fluorescence decay magnetic properties

双辉光离子渗金属──一种新颖的等离子体表面冶金技术

在线全文

学校读者我要写书评

暂无评论

物理 1996年第4期25卷 229-237页

作者：李家全余萍袁斌耿漫尚振魁王经权徐重王从曾苏永安核工业西南物理研究院成都610041 太原工业大学太原030024

综述了双辉光离子渗金属这一新颖的等离子体表面冶金技术，介绍了双辉光交链增强型放电这一独特的放电现象，讨论了双辉光交链增强的条件和交链增强的机理以及它在双辉光离子渗金属技术中的作用，介绍了双辉光离子渗金属的实验研究结果... 详细信息

综述了双辉光离子渗金属这一新颖的等离子体表面冶金技术，介绍了双辉光交链增强型放电这一独特的放电现象，讨论了双辉光交链增强的条件和交链增强的机理以及它在双辉光离子渗金属技术中的作用，介绍了双辉光离子渗金属的实验研究结果及在国内工业化推广应用的情况，评述了它的应用前景及在推广应用中应注意的问题．

关键词：双辉光放电离子渗金属等离子体表面冶金

A Simple Birefringent Terahertz Waveguide Based on Polymer Elliptical Tube

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2011年第1期28卷 112-114页

作者： WANG jing-Li YAO Jian-quan CHEN He-Ming LI zhong-Yang Institute of Laser and Optoelectronics Key Laboratory of Optoelectronic Information Science and Technology (Ministry of Education) College of Precision Instrument and Optoelectronic Engineering Tianjin University Tianjin 300072 College of Optoelectronic Engineering Institute of Optical Communications Nanjing University of Posts and Telecommunications Nanjing 210003

We propose a simple birefringent terahertz （THz） waveguide which is a polymer elliptical tube with a cross section of elliptical ring structure. It can be achieved by stretching a normal circular-tube in one direction. Simulations based on the full-vector finite element method （FEM） show that this kind of waveguides exhibits high birefringenee on a level of 10- 2 over a wide THz frequency range. Moreover, as a majority of modal power is trapped in the air core inside the polymer elliptical tube, the THz waveguide guiding loss caused by material absorption can be reduced effectively.

关键词： Computational physics Electronics and devices

Characteristics of compressible flow of supercritical kerosene

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

Acta Mechanica Sinica 2012年第1期28卷 8-13页

作者： Feng-quan zhong Xue-Jun Fan jing Wang Gong Yu Jian-Guo Li Institute of Mechanics Chinese Academy of Sciences100190 BeijingChina

In this paper, compressible flow of aviation kerosene at supercritical conditions has been studied both numerically and experimentally. The thermophysical properties of supercritical kerosene are calculated using a 10- species surrogate based on the principle of extended corresponding states （ECS）. Isentropic acceleration of supercritical kerosene to subsonic and supersonic speeds has been analyzed numerically. It has been found that the isentropic relationships of supercritical kerosene are significantly dif- ferent from those of ideal gases, A two-stage fuel heating and delivery system is used to heat the kerosene up to a tem- perature of 820 K and pressure of 5.5 MPa with a maximum mass flow rate of 100 g/s. The characteristics of supercritical kerosene flows in a converging-diverging nozzle （Laval nozzle） have been studied experimentally. The results show that stable supersonic flows of kerosene could be established in the temperature range of 730 K-820 K and the measurements in the wall pressure agree with the numerical calculation.

关键词： Supercritical kerosene - Compressible flow Laval nozzle Isentropic process

一株小菇属天麻萌发菌原生质体的制备、再生和应用

在线全文

学校读者我要写书评

暂无评论

陕西科技大学学报 2025年第1期43卷 58-66页

作者：李宏敬李锡琴粟忠祥仇全雷雷云霆西南林业大学林学院云南昆明650224 中国科学院昆明植物研究所云南昆明650201 昆明市林草局西山林场云南昆明650199 西藏波密高原藏天麻产业开发有限公司西藏林芝860318

小菇属真菌(Mycena spp.)遗传转化体系是研究其促进天麻种子萌发机制的重要基础,而其原生质体的制备和再生是该体系构建的必要条件.以小菇菌株MY004为实验材料,通过单因素分析和正交试验策略,探究其原生质体制备和再生的影响因素,构建... 详细信息

小菇属真菌(Mycena spp.)遗传转化体系是研究其促进天麻种子萌发机制的重要基础,而其原生质体的制备和再生是该体系构建的必要条件.以小菇菌株MY004为实验材料,通过单因素分析和正交试验策略,探究其原生质体制备和再生的影响因素,构建小菇原生质体制备和再生体系.结果表明,在含10 mM MES和0.7 M甘露醇的酶解缓冲液(pH=6)中,小菇MY004菌丝被10 mg/mL真菌溶壁酶在24℃条件下酶解3 h,其原生质体的释放率较高;经液体再生培养基(pH=5)培养3天,其原生质体再生效率可达2%.利用该体系,高效地完成了含报告基因eGFP转基因小菇的菌株纯化.小菇原生质体制备和再生体系可用于小菇遗传转化体系的快速构建,也将为小菇与天麻互作分子机制的研究提供基础平台.

关键词：小菇原生质体制备原生质体再生转基因菌株纯化

利用原子在圆偏振激光场中的强场电离产生自旋极化电子

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第3期42卷 101-109页

作者：王中元高轩鸿景文泉杜进旭赵松峰西北师范大学物理与电子工程学院兰州730070

圆偏振激光场中原子的非绝热强场电离为产生自旋极化电子提供了机会.我们应用这些解析电离速率公式[Ingo Barth and Olga Smirnova,***.A 88,013401(2013)]更系统地研究了通过Kr和Xe原子在右旋圆偏振激光脉冲中的强场电离产生自旋极化电... 详细信息

圆偏振激光场中原子的非绝热强场电离为产生自旋极化电子提供了机会.我们应用这些解析电离速率公式[Ingo Barth and Olga Smirnova,***.A 88,013401(2013)]更系统地研究了通过Kr和Xe原子在右旋圆偏振激光脉冲中的强场电离产生自旋极化电子,并证实了不同自旋态的光电子能量分布有很大差异、电子的自旋极化敏感地依赖于光电子能量.另外,在光电子能谱的低能部分其自旋极化可以达到100%,并且通过调节激光强度和频率可以很好地控制能量积分的自旋极化.

关键词：自旋极化电子非绝热强场电离右旋圆偏振激光场

维普期刊数据库博看期刊

The Limit Theorems for Maxima of Stationary Gaussian Processes with Random Index

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2014年第6期30卷 1021-1032页

作者： zhong quan TAN College of Mathematics Physics and Information Engineering Jiaxing University

Let {X（t）, t ≥ 0} be a standard（zero-mean, unit-variance） stationary Gaussian process with correlation function r（·） and continuous sample paths. In this paper, we consider the maxima M（T） = max{X（t）, t∈ [0, T ]} with random index TT, where TT /T converges to a non-degenerate distribution or to a positive random variable in probability, and show that the limit distribution of M（TT） exists under some additional conditions related to the correlation function r（·）.

关键词： Limit theorem weak convergence maximum random index stationary Gaussian process

Enantioselective reductive conjugate alkenylation of α,β-enones with keto alkenyl acetates by nickel catalysis

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 157-162页

作者： Rong-De He Yun-Lei Luo Qiu-quan Pan Qi-Wei Yao Xing-zhong Shu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University

Reactions involving alkenyl acetates offer cost-effective and environmentally friendly routes for alkene synthesis, yet their asymmetric variant remains elusive. Concurrently, asymmetric conjugate alkenylation predominantly centered on nucleophilic addition using alkenyl–M. This manuscript presents an asymmetric reductive conjugate alkenylation reaction involving alkenyl acetates. The method facilitates the enantioselective addition of keto alkenyl groups to α,β-enones, resulting in the formation of unsaturated diketones—a class of useful structural motifs that are challenging to access otherwise. The use of electron-rich Pyroxy ligand is essential for achieving both high reaction efficiency and enantioselectivity.

关键词：