含双二苯基膦甲烷双核铜Ⅰ配合物的合成及性质

利用配体取代反应合成了四种含双二苯基膦甲烷 (dppm)的双铜 配合物 [Cu2 (dppm) 2 L2 ](NO3) 2 (配体L分别是 2 ,2’ 联吡啶 (1)、邻菲咯啉 (2 )、2 ,9 二甲基 邻菲咯啉 (3)、吡啶 (4 ) ],并经核磁、热分析、光电子能谱等方法表征了配合物的性质。配合物 (1)的晶体结构显示 ,dppm作为桥式双齿配体、联吡啶作为双齿配体分别与铜原子形成四面体配位结构 ,硝酸根离子位于配合物外界     

Preparation of arbitrary n-particle d-dimensional superposition states using only single qubit operations and CNOT gates

In this article, using only single qubit operation and a CNOT gate, we propose a scheme for creating arbitrary n-particle d-dimensional superposition states including entangled states and give the relevant circuits for realizing this scheme.     

碳纳米管负载氧化铝材料的制备及其吸附水中氟离子的研究

采用碳纳米管和硝酸铝制备了碳纳米管负载氧化铝新型除氟材料.X射线衍射检测发现,当焙烧温度低于850℃时,氧化铝为无定形态,当焙烧温度为1050℃时,氧化铝为α形态,扫描电子显微镜观察到碳纳米管与氧化铝均匀掺杂.同时用碳纳米管负载氧化铝复合材料进行水中氟离子的吸附研究,结果表明,该复合材料具有优良的除氟效能.氧化铝负载量为30%、焙烧温度为450℃条件下制备的碳纳米管负载氧化铝复合材料的吸附除氟能力是γ-氧化铝的2.0～3.5倍,与IRA-410聚合树脂的吸附除氟能力相当,适宜pH范围为5.0～9.0,吸附等温线符合Freundlich方程.     

Enhanced performance of a mutually pumped phase-conjugation setup using two photorefractive crystals

A mutually pumped phase-conjugator (MPPC) consisting of two photorefractive crystals is investigated experimentally at a wavelength of about 807 nm. In addition to a Rh:BaTiO₃ crystal, which is used in a modified bridge configuration for phase-conjugation, a Co:BaTiO₃ crystal is used to amplify the phase-conjugate beam by wave-mixing. The phase-conjugate power is at least doubled compared to that using only one crystal, and the beam quality of the phase-conjugate beam is distinctly improved. Moreover, the temporal stability of the phase-conjugate output using two crystals is much higher than that using only one crystal. Received: 7 December 2000 / Revised version: 12 January 2001 / Published online: 27 April 2001     

网络间含离子键的聚氨酯/接枝乙烯基酯树脂互穿聚合物网络 研究

分别以双酚-A型环氧树脂E-51和聚醚型环氧树脂E-46为原料合成了两种二乙胺-环氧树脂和加成多元醇(分别命名为AE-51,AE-46),将其和甲基丙烯酸一起用于合成聚氨酯/接枝乙烯基酯树脂(PU/接枝VER)互穿聚合物网络(IPN),使之在两个网络间形成离子键。实验结果表明,这类新型的IPN材料中两个网络间的互穿程度与相容性进一步提高,从而导致刚性的接枝VER对弹性的PU网络有更好的增强效果。DSC和FTIR的测定结果表明,在含AE-51的IPN中,由于离子键的作用使PU网络硬段的有序结构遭到很大程度的破坏,与AE-51和PU网络中的硬段以及VER网络有较好的相容性有关,因此这类IPN材料具有较好的力学性能。     

模拟生物矿化过程原位合成活性纳米碳酸钙

生物矿化是一种广泛而复杂的固液之间、有机物和无机物间的物理化学过程．以少量有机质为模板,进行分子操作,高度有序地组合成无机材料．有机基质能作为构造支持的惰性底质或矿物沉淀的局限空间和核化作用的表面,确定矿物质点的形态大小、空间排列、结晶取向和同质多晶类型,并与生物晶体一起确定生物矿物硬体的机械性质．     

Bi-2223 bar current leads fabricated by the combination of cold isostatic pressing and hot-pressing

A new method using a combination of cold isostatic pressing (CIP) and hot-pressing (HP) was applied to fabricate Bi-2223 bar current leads. The critical current density (J_c) achieved by this method reached as high as 1000 A/cm² at 77 K and self-generated magnetic field. This value of J_c presented here is much higher than the best J_c reported for rod current leads which is 570 A/cm² achieved by CIP technique [Y. Yamada, Bi-based bulk current leads and their applications, in: H. Meada, K. Togano (Eds.), Bismuth-based High-temperature Superconductors, 1996, p. 277.]. The phases and microstructures were analysed by XRD and SEM. The texture and weak link were studied by pole figures and AC susceptibility, respectively. The results show that the grain connectivity, matrix density and texture of the samples were improved significantly by this method.     

高温煤气中氨的脱除：Ⅱ.氨催化分解动力学的研究

研究了Ｎｉ－ ３催化剂分解氨的动力学。考察了各种反应条件如温度、空速以及气体中的氨和氢的浓度对反应的影响,确立了氨催化分解动力学方程式。当操作空速为３０００ｈ－ １ 时,在５８０ ～６３０℃的温度区间内,反应主要受化学反应控制;在６３０～７００℃的温度区间内,反应受扩散影响较为严重;在７００℃以上的温度区间内,反应在一定程度上受平衡的影响。随着空速的增大反应速率增大,但转化率却有所减小;气体中氨浓度的增大对反应转化率没有什么影响,氢浓度的增大使反应转化率明显减小。在５８０～６３０℃的温度范围内,空速３０００ｈ－ １ 的操作条件下动力学方程式如下：Ｒ＝ ３．４２３×１０１３ｅ－ ２７６ ．４５ ×１０３ＲＴ ＣＮＨ３·Ｃ－ １－５Ｈ２     

The Studies of Fast Atom Bombardment Mass Spectrometry of Melezitose Derivatives

Melezitose is a kind of nonreducing sugar, its structure is 3-(α-D-glucopyranosyl)-β-D-fructofuranosyl-α-D-glucopyranose, it is a principal constituent of Alhagi pseudalhagi Desv.manna, which is used as a drug in Uygur medicine.