Binuclear Lanthanide Complexes Containing SodiumSyntheses and Crystal Structure of (C_5Me_5)_2Nd(μ-Cl)_2Na(DME)_2 and (C_5Me_5)_2Nd(μ-OCH_3)_2Na(DME)_2

The reaction of NdCl_3 with NaC_5Me_5 generates a novel complex (C_5Me_5)_2Nd(μ-Cl)_2Na(DME)_2 (1).Then (1) reacts with 1 mol ratio Na and a little methyl-naphthalene generating another novel complex(C_5Me_5)_2Nd(μ-OCH_3)_2Na(DME)_2 (2).Complex (1) belongs to orthorhombic crystal system,space groupPbn2_1 with a=1.2635(3) nm,b=1.6127(5) nm,c=1.6543(4J nm,V=3.371(2) nm~3,D_c=1.36 gcm~(-3) andZ=4.The central metal Nd is coordinated by two C_5Me5 ring centroids and two μ-chlorine atoms forming adistorted tetrahedron.The crystal of complex (2) is monoclinic,space group C2/n with a=1.7482(5) nm,b=1.3260(4) nm,c=1.6406(7) nm,β=109.39(3)°,V=3.5874(1) nm~3,D_c=1.26 gcm~(-3) and Z=4,Twofive-membered ring centroids and two p-oxygens of OCH_3 form a distorted tetrahedron around the centralneodymium ion.     

季冻区温度变化对基坑支护结构影响模拟分析

采用FLAC 3D有限差分软件对基坑悬臂桩支护在冻融循环作用下的影响进行模拟研究.建立基坑模型,采用摩尔-库仑弹塑性本构模型,讨论了正负温水平冻胀力和桩体水平位移的变化规律,以及不同温度冻结深度及冻结速率的变化.通过数值模拟结果表明温度对桩的水平冻胀力和水平位移影响很大,负温情况下温度越低,土体冻结速率越大,其水平冻胀力越大,桩体水平位移也随温度的降低而增大.水平冻胀力最大值在坑底处,水平位移最大值在桩顶处产生.土体冻融作用后,随温度的升高桩侧土压力值逐渐减小,水平位移也逐渐减小,且最大水平位移仍在桩顶.     

聚合条件对稀土丁二烯-异戊二烯共聚物的分子量及其分布的影响

中国科学院长春应用化学研究所     

国内民用机场安检综合信息管理系统设计概述

本文结合国内机场的情况和民航相关规定,提出了一套能符合实际的安检信息管理系统的概念。通过用户的需求,规划了该系统大框架的构成,包括交运行李安检系统、手提行李安检系统、货运安检系统、安检培训系统等。文章初步定义了该管理系统及各子系统的功能;并对该系统最终能实现的核心问题“人包对应”的问题进行分析,提出了自己的解决方案。     

Synthesis and characterization of lanthanide complexes containing a bulky tridentate [N,N,O] Schiff base ligand

The lanthanide complexes containing a bulky tridentate [N,N,O] Schiff base ligand 3,5-But2-2-(OH)C6H2CH=N-8-C9H6N (HL) were synthesized and characterized. The reaction of anhydrous LnCl3 with NaL formed in situ in a 1:1 molar ratio in THF at room temperature afforded the lanthanide Schiff base dichloride complexes LnLCl2(DME) (Ln=Eu (1);Sm (2)). Complexes 1 and 2 can be used as precursors for the synthesis of the lanthanide cyclopentadienyl Schiff base derivatives. The reactions of complexes 1 and 2 with one equiv of NaCH3C5H4 in THF provided the desired products LnL(CH3C5H4)Cl(THF)·THF (Ln=Eu (3);Sm (4)) in good isolated yields. These complexes were characterized by elemental analysis, IR spectra, and X-ray structural determination, in the case of complexes 3 and 4. The crystal data of complex 3 are monoclinic, P21/c space group, a=1.3370(2) nm, b=1.5190(2) nm, c=1.8910(3) nm, β=109.846(4)°, V=3.6125(8) nm3, Z=4, Dc=1.416 mg/m3, μ=1.847 mm-1, F(000)=1584, R=0.0707, wR=0.1350. The crystal data of complex 4 are monoclinic, P21/c space group, a=1.3383(1) nm, b=1.5210(2) nm, c=1.8960(2) nm, β =109.878(3)°, V=3.6293(7) nm3, Z=4, Dc=1.407 mg/m3, μ=1.728 mm-1, F(000)=1580, R=0.0670, wR=0.1385.     

Synthesis, Characterization, and Reactivity of Amine Bis（phenolato） Cyclopentadienyl Lanthanide Complexes

（C5H5）3Ln（THF）reacted with amine bis（phenol） LH2 [ L = Me2NCH2CH2N {CH2-（2-O-C6H2-But^1-3-Me- 5）}2 ] in a 1：1 molar ratio in THF to generate the amine bis（phenolato） cyclopentadienyl lanthanide complexes LLn（C5H5） （THF）·（THF）,（Ln = La （1）, n =0; Ln = Sm（2）, n = 1） in high yields. Complexes 1 and 2 were fully characterized by elemental analysis, NMR （for 1） and IR spectra, and X-ray structural determination. The crystal data of complex 1 are monoclinic, P21/c space goup, a= 1.1595（1） nm, b = 1.8588（2） nm, c = 1.6647（1） nm, β = 98.490（2）°, V =3.5486（5） nm^3, Z =4, Dc = 1.338 mg· m^3,μ = 1240 mm^-1, F（000）= 1488, R =0.0249, wR = 0.0568. The crystal data of complex 2 are monoclinic, P21/c sp ace goup, a = 0.9692 （1） nm, b = 1.4583 （2） nm, c = 2.8192 （3） nm, = 96.805 （2）°, V = 3.9584 （7） nm^3, Z=4, Dc =1.340 mg · ma, μ = 1.524 mm^-1, F（000）= 1668, R =0.0346, wR =0.0756. The attempts failed to synthesize the amine bis（phenolate） lanthanide alkoxides by the reactions of complexes 1 and 2 with alcohols. The preliminary results revealed that complex 1 can initiate ε-caprolactone polymerization.     

浅析计量检测工作中的服务创新

我国在工业企业全面开展计量工作己经有很长的时间,取得了卓有成效的成绩。一是通过严把原材料质量关,制止或预防质量事故,来保证产品质量,促进了产品质量的提高。二是促进节能降耗,为企业增加了大量的经济效益,增强产品的市场竞争力。三是促进企业内部管理的加强,实现了内部管理的科学化。四是强化企业的计量法制意识,维护企业的合法权益。企业基本完成了向法定计量单位的过渡,强检工作得以顺利进行,更重要的是许多企业能够运用计量法律法规,维护自己的合法权益。     

基于Web GIS的光伏发电项目开发经济性分析平台研发

结合云南省电力设计院有限公司光伏发电项目投资需要,基于中电工程光伏项目经济评价模型计算光伏发电项目开发经济性,采用PostgreSQL数据库、SuperMap地图服务和OpenLayers框架等GIS技术基于Vue框架研发光伏项目开发经济性分析平台。该系统实现光伏项目开发经济性结果的快速查询和快速前期评估,可有效提升光伏项目投资经济性评价的工作效率。     

基于新农村视角的我国农田水利建设

从我国农村农田水利工作实际情况出发,分析了农村农田水利工作的主要内容,介绍了我国农村农田水利工作发展存在的问题,在相关理论分析的基础上,提出了新时期加快发展农田水利建设的措施.