Photosynthesis and Molecular Structure of2—Amino—3H—phenoxazin—3—one

1 INTRODUCTION 2-Amino-3H-phenoxazin-3-one (APX) is related to the naturally occurring antineoplastic actinomycin D and has been used as a chemical model of actinomycin D[1]. Usually APX is synthesized from 2-aminophenol with the phenoxazinone synthase in human body[2]. A variety of artificial synthesis methods of APX via the oxidation of 2-aminophenol have also been reported, but each method needs some artificial condition such as chemical catalysis[3～7], natural enzyme[8], UV…     

3—（3‘—羟基丁基）异苯并呋喃—1（3H）—酮的合成

由邻苯二甲酸酐为原料，经中间体３－羟基苯酞（３），再经溴丙烯及锡存在下３的烯丙基化、硼氢化氧化、铬酐氧化，二甲基锌甲基化，共６步反应合成了３－（３‘－羟基丁基）异苯并呋喃－１（３Ｈ）－酮。     

掺杂Eu2O3的SrTiO3及SnO2光致发光

用具有大能隙的本征半导体(SrTiO₃及SnO₂)粉末作本体,分别掺杂1%(原子百分数)的Eu₂O₃;所得物质表现出Eu³⁺离子的线发射光谱特性,但相对发光强度及光谱形状有相当大的变化。X射线衍射结构分析显示Eu³⁺在SrTiO₃晶格里是处在间隙位置,而它在SnO₂晶格里则形成新物相Eu₂Sn₂O₇。     

Electrical conductivity of g-Bi2O3-V2O5 solid solution

The total conductivity (σ_T) in bcc γ-Bi₂O₃ doped with V₂O₅ system has been measured in the composition range between 1 and 7 mol% V₂O₅ at different temperatures. Phase transitions for different addition amounts depending on the temperature were investigated by quenching the samples. According to the XRD and DTA/TG results, this bcc type solid solution was stable up to about 720°C and the solubility limit was found at ˜7 mol% V₂O₅ in γ-phase. This system showed predominantly an oxide ionic conduction. As the V₂O₅ addition increased, the ionic conduction increased up to 5 mol% V₂O₅ at which the highest conductivity was found to be 8.318·10^-2 Ω^-1 cm^-1 at 700°C and then decreased. It has been proposed that γ-Bi₂O₃ phase contains a large number of oxide anion vacancies and incorporated vanadium cations at tetrahedral sites which affect the oxygen sublattice of the crystal structure. This revised version was published online in August 2006 with corrections to the Cover Date.     

氧化镍/莫来石-刚玉催化剂中添加La2O3的作用

用ＸＲＤ，ＴＰＲ，ＴＧ－ＤＴＡ考察了氧化镍／莫来石－刚玉催化剂添加Ｌａ２Ｏ３对ＮｉＯ性质的影响及两者间的相互作用，Ｌａ２Ｏ３使得催化剂中ＮｉＯ的晶格常数及分散容量增大，而晶相含量减少，还发现，添加Ｌａ２Ｏ３，使一次ＴＰＲ过程中ＮｉＯ还原温度升高，耗氢量增加了Ｌａ２Ｏ３对二次ＴＰＲ中ＮｉＯ还原温度的影响减小，耗氢量不受影响，Ｌａ２Ｏ３的添加方式及含量不同，对ＮｉＯ性质的影响也不相同。     

萃取色谱分离—原子发射光谱测定氧化钐,氧化铕,氧化钆中14个稀土杂质

用２－乙基己基膦酸单２－乙基己酯萃取色谱分离－原子发射光谱测定超高纯Ｓｍ２Ｏ３、Ｅｕ２Ｏ３、Ｇｄ２Ｏ３中痕量稀土杂质，可用于纯度为９９９９９９％～９９９９９９９％（不含非稀土杂质）Ｓｍ２Ｏ３、Ｅｕ２Ｏ３、Ｇｄ２Ｏ３的纯度分析，１４个稀土杂质的回收率在６７％～１３３％之间，相对标准偏差±６４％～±１８４％，分离周期１０～１４ｈ。     

Oxygen ionic transport in Bi2O3-based oxides: II. The Bi2O3–ZrO2–Y2O3 and Bi2O3–Nb2O5–Ho2O3 solid solutions

Electrical conductivity, fluorite-type cubic unit cell volume and thermal expansion of the (Bi_{1− x} Nb _x )_{1− y} Ho _y O_1.5+δ (x=0.05 and 0.08; y=0.10−0.15) and (Bi_{1− x} Zr _x )_{1− y} Y _y O_1.5+δ (x=0.05 and 0.07; y=0.15) solid solutions have been found to decrease regularly with increasing dopant content. Annealing at temperatures below 900 K leads to a phase decomposition and to a sharp decrease in conductivity of the ceramics. Oxygen ion transference numbers have been determined by the e.m.f. method and by Faradaic efficiency measurement to exceed 0.9. A new technique of studying Faradaic efficiency has been proposed and verified using (Bi_0.95Zr_0.05)_0.85Y_0.15O_1.5+δ and Zr_0.90Y_0.10O_1.95 ceramic samples. Received: 31 October 1997 / Accepted: 18 December 1997     

超细纳米TiO2/Al2O3复合体的制备及其组成分布的研究

采用溶胶－凝胶法成功制备出纳米尺寸的ＴｉＯ２／Ａｌ２Ｏ３复合体,并用ＸＲＤ、ＸＰＳ和ＩＲ等手段研究了复合体的结构组成及ＴｉＯ２和Ａｌ２Ｏ２的分布状态,进一步探讨了机械研磨法制备ＴｉＯ２／Ａｌ２Ｏ３复合体等因素对其组成的影响。ＸＲＤ分析表明,在〔Ａｌ＾＋３〕：〔Ｔｉ＾＋３〕＝１：１（或０．５）情况下,改进的溶胶－凝胶法制备纳米ＴｉＯ２／Ａｌ２Ｏ３复合体,其ＴｉＯ２主要分布在Ａｌ２Ｏ３的表面层,在含Ｔ     

均分散氧化亚铜溶胶的制备

均分散体系是指分散相粒子形状大小均相同的体系,我们曾研究过尿素水解法和强制水解法制备均分散氧化铜微粒.手续上大大简化.因为均分散制备不同于机械粉碎、气相沉积等方法,体系是在液相中生成晶核后,各个晶核同步生长形成的.因此,溶液中的pH、阴离子、络合剂、反应物浓度以及温度都会影响粒子生长.McFadyen 等人曾研究过酒石酸铜用葡萄糖还原氧化亚铜微粒,由于条件不同可得不同形状大小微粒.