Hicom交换机长途呼叫不畅故障的处理

Ｈｉｃｏｍ交换机长途呼叫不畅故障的处理宋彦鹏赵辉１故障现象某石油专网中Ｈｉｃｏｍ交换机的用户反映，拨打一些城市的某些局向的电话，很难打通或者根本打不通．该Ｈｉｃｏｍ交换机与上级局的连接方式见附图．该交换机以端局形式和专网汇接局采用２Ｍｂｓ数字中继线连...     

UPS故障排除一例

ＵＰＳ故障排除一例赵辉呼和浩特地球站使用的ＵＰＳ为ＥＸＩＤＥ公司的产品，型号为２０４５（该机１９８５年投入使用）。在１９９３年１月发生的一次故障较有特点。出现故障时ＵＰＳ告警，告警显示为：ＩＮＶＬＥＧＯＴＥＭＰ（逆变器插件温度过高）从告警显示来看，是...     

9-羟基-芴-9-羧酸双核铜配合物[Cu(C_(14)H_8O_3)(C_9H_7N)(C_2H_5OH)]_2的合成、晶体结构及热稳定性研究

在自然界中,α-羟基羧酸广泛的存在于动植物体内,在羧酸循环、碳水化合物代谢和氨基酸的合成中起到重要的作用。Tapscott等详细总结了有关羟基羧酸及其金属配合物的合成化学[1]。芴的9位上2个氢原子被羟基和羧基取代可生成9-羟基-芴-9-羧酸(简称芴酸),它是α-羟基乙酸的衍生物,是一种具有生理活性的植物生长整形素,它能够延缓植株生长,影响植株根的向地性和茎的向光性[2]。由于芴酸含有羟基和羧基两种不同的氧配位原子,使其又可以作为一种潜在的构筑配合物的组织基元。目前有关芴酸与金属离子的合成与结构化学研究相对较少,仅见铜、镉的单…     

一维链状锰配位聚合物[Mn(4-CPOA)(2,2-bipy)(H_2O)]_n的合成与晶体结构(英文)

0IntroductionThe solid-state chemistry of manganese!car-boxylate coordination polymers has received growingattention over the past few years,owing to their fasci-nating network topologies and potential application inthe field of molecular magnetism and bi…     

三维网状的4-羧基苯氧乙酸锶(Ⅱ)配位聚合物[Sr2(4-CPOA)2(H2O)5]n的合成、结构与热稳定性研究

A novel coordination polymer of [Sr₂(4-CPOA)₂(H₂O)₅]_n (where 4-CPOA^2- is 4-carboxylphenoxyacetate) has been synthesized and characterized by elemental analysis, IR, TG and single crystal X-ray diffraction. The title complex belongs to monoclinic system with space group C2/c, a=2.563 9(5) nm, b=1.162 7(2) nm, c=0.742 96(15) nm, β=99.64(3)°. V=2.183 5(7) nm³, Z=4, M_r=653.60, D_c=1.988 g·cm^-3, R=0.027 8, wR=0.058 1. The strontium atom has a bicapped triangular prismatic coordination geometry, involving four oxoacetate oxygen atoms, one ether oxygen atom from different 4-CPOA^2- ligands and three water molecules. The strontium(Ⅱ) ions are linked by 4-CPOA^2- ligands and water molecules to form a 3D network structure. CCDC: 223313.     

一维链状柔性羧酸镉配位聚合物[Cd(p-BDOA)·2H2O]n的合成、结构与性质研究(英)

A novel 1-D Cd(Ⅱ) coordination polymer, [Cd(p-BDOA)·2H₂O]_n(I) ( p-BDOA^2-=benzene-1,4-dioxyacetate dianion) has been synthesized and characterized by elemental analysis, IR, PL, TG and X-ray single crystal diffraction. The Crystal crystallizes in monoclinic system, the space group is C2/c, with the crystal cell parameters a=1.175 1(1) nm, b=0.551 0(1) nm, c=1.827 7(2) nm, β=96.14(2)°, and V=1.176 6(3) nm^3,, M_r=372.60, R=0.045 9, wR=0.127 9. The Cd(Ⅱ) ion has a trigonal prism coordination configuration that defined by four carboxyl O atoms from two different p-BDOA^2- ligands and two water molecules. Adjacent Cd(Ⅱ) ions are linked by carboxylate groups with the bidentate coordination mode, giving rise to a chain structure with the adjacent Cd…Cd distance of 1.526 3(5) nm. Furthermore, such chains are linked by hydrogen bonds to form supramolecular network. The results of PL and TG show that the complex exhibits intense fluorescent emissions and its chain skeleton is thermally stable up to 419 K. CCDC: 220443.     

(Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ-Ce0.9Gd0.1O2-δ复合阴极的制备及电化学性质

采用EDTA-柠檬酸盐法制备了（Pr_0.9La_0.1）₂（Ni_0.74Cu_0.21Ga_0.05）O_4+δ（PLNCG）,并与Ce_0.9Gd_0.1O_2-δ（CGO）形成复合阴极PLNCG-CGO。XRD和SEM分析结果表明PLNCG与CGO在1 000℃具有较好的化学相容性。电化学阻抗测试结果表明PLNCG-30% CGO复合阴极在700℃的极化电阻为0.092 Ω·cm²;过电位为39.3 mV时,电流密度达到113.3 mA·cm^-2。氧分压分析表明电极反应的速率控制步骤为电荷转移过程。阳极支撑单电池（Ni-CGO/CGO/PLNCG-30% CGO）在700℃的最大输出功率密度达到569 mW·cm^-2,开路电压（OCV）为0.76 V。综上结果预示PLNCG-30% CGO复合阴极是一种有发展前景的电极材料。