End-capped polystyrene with 8-hydroxyquinoline group by ATRP method

8-Hydroxyqunioline end-capped polystyrene was prepared through atom transfer free radical polymerization (ATRP) with 8-(5-chloromethyl) quinolyl acetate as initiator. The results indicated that this polymerization is a first order reaction with respect to monomer conversion. The molecular weight increased linearly with monomer consumption and very narrow distribution of molecular weight was obtained (polydispersity index less than 1.2). The FT-IR and NMR results show that the 8-hydroxyquinloine group was chemically bonded to the polymer end and there is nearly one 8-hydroxyquinoline group in per polymer chain. All those data show that polymerization of styrene at such conditions displayed living characters. The polymer with 8-hydroxyqquinoline end group reacted with triethylaluminum to form polymeric light-emitting complex and single layer LED was prepared by common spin-coating method. The peak wavelength of LED based on synthesized polymeric complex was around 570 nm.     

Electrosynthèse des ions peroxodiphosphate sous potentiel constant ou pulsé

Electrosynthesis of peroxodiphosphate ions (P2O84–) was performed in 2m K3PO4, 1m K2HPO4 medium, using a platinum anode. The results showed that under conditions of potentiostatic polarization at constant potential, the reaction rate reaches a maximum value of 125mAcm–2 and a faradaic yield of 30%. From about 1.9V, the reaction kinetics are increasingly inhibited as the potential shifts positively. Rapid scanning potential voltammetry was used to characterize the oxidation state of the electrode surface. This method shows that the growth of (PtO) and (PtO2 or PtO3) oxides depend on the applied potential. It also establishes a correlation between the inhibition of P2O84– ion electrosynthesis and the oxide coating surface. When 2×10–3m KSCN is added to the solution, some oxygen evolution sites are selectively blocked and oxide occurs at more positive potential values. Consequently, the rate of peroxodiphosphate ion formation and the faradaic efficiency are increased to 380mAcm–2 and 75%, respectively. Under pulsed potential conditions it was possible to reach 1200mAcm–2 for P2O84– ion electrosynthesis with a faradaic yield of 82%.     

Structure–Function Relations in Supported Ni–W Sulfide Hydrogenation Catalysts

Ni–W catalysts were prepared by impregnation of commercial -alumina and silica supports. The sulfidation, performed directly after drying at 100°C, yielded fully sulfided Ni–W species on both supports (SEM-EDAX, XPS, XRD). At optimal metals loading (50 wt% NiO + WO₃, Ni/W = 2), the sulfided catalysts had similar texture (N₂ adsorption) and displayed similar activity in dibenzothiophene hydrodesulfurization (DBT HDS), while the activity of the Ni–W/SiO₂ catalyst in toluene hydrogenation (HYD) was six times higher than that of Ni–W/Al₂O₃. This is due to the more than two times higher WS₂ slabs stacking number in Ni–W/SiO₂ compared with Ni–W/Al₂O₃ (XRD, HR-TEM), yielding stronger adsorption of toluene (TPD).     

硝基-3-氧-3，4-二氢-2H-[1，4]苯并噁嗪-6-羧酸的合成

以4-羟基-3-硝基苯甲酸为原料,经酯化、醚化、还原合环、硝化、水解等5步反应,合成了两个未见文献报导的化合物7-硝基-3-氧-3,4-二氢-2H-[1,4]苯并噁嗪-6-羧酸和8-硝基-3-氧-3,4-二氢-2H-[1,4]苯并嗪-6-羧酸,其结构经IR、LC/MS、1HNMR和元素分析确证。     

Effects of allelochemicals on plant respiration and oxygen isotope fractionation by the alternative oxidase

The goal of this investigation was to determine the effects of allelochemicals on plant respiration that thereby may be responsible for their role in growth inhibition. We have tested the effects of juglone, quercetin, cinnamic acid, and-pinene on respiration rates, and electron partitioning through the cytochrome and alternative respiratory pathways, by measuring on-line oxygen consumption and oxygen isotope fractionation in soybean cotyledon tissue. Cinnamic acid and-pinene decreased the oxygen consumption rate and increased the relative partitioning of electron transport to the alternative pathway. Possible biochemical mechanisms of these effects are discussed.     

负热膨胀材料钨酸锆研究进展

ZrW2O8是由0.3K至分解温度1050K都具有各向同性的负热膨胀化合物,但由于其窄的热稳定范围反应合成相当困难。本文综述了该材料的各种合成技术以及该材料的负热膨胀的机理,讨论了ZrW2O8的特性,介绍了其潜在的应用。     

8─羟基喹啉─5─磺酸柱前衍生反相HPLC分离测定痕量Al（Ⅲ）、Co（Ⅲ）、Fe（Ⅲ）和Pd（Ⅱ）

本文采用８－羟基喹啉－５－磺酸（ＨＱＳ）为柱前衍生试剂，用含有１０ｍｍｏｌ·Ｌ－１的四丁基溴化铵（ＴＢＡ＋Ｂｒ－）、７．５×１０－５ｍｏｌ·Ｌ－１的ＥＤＴＡ和２０ｍｍｏｌ·Ｌ－１的ｐＨ５．６乙酸－乙酸钠缓冲溶液的甲醇－水（４５：５５，Ｖ／Ｖ）溶液为流动相，以Ｃ１８硅烷化载体为固定相，１６ｍｉｎ内分离测定了Ｃｏ（Ⅲ）、Ｆｅ（Ⅲ）、Ａｌ（Ⅲ）和Ｐｄ（Ⅱ）的ＨＱＳ的配合物、信噪比为３时，检出限分别为：Ｃｏ（Ⅲ）０．９ｐｐｂ、Ｆｅ（Ⅲ）１．５ｐｐｂ和Ｐｄ（Ⅱ）５．４ｐｐｂ，方法灵敏度高，干扰少，用于测定试剂级盐酸，硝酸和中国红茶样品中的这些离子，结果良好。     

Synthesis and metal uptake studies on poly(8‐hydroxy‐5‐azoquinolinephenylacrylate‐formaldehyde) resin and its metal complexes

8‐hydroxy‐5‐azoquinolinephenylacrylate‐formaldehyde (8H5AQPA‐F) macromonomer was prepared from acryloylchloride, with condensation products of 8‐hydroxy‐5‐azoquinolinephenol‐formaldehyde, and polymerized in DMF at 70°C using benzoyl peroxide as free radical initiator. Poly(8H5AQPA‐F) was characterized by infrared and nuclear magnetic resonance spectroscopic techniques. Polychelates were obtained in alkaline solution of polymeric ligand, with the aqueous solution of Cu(II) and Ni(II). Elemental analysis of polychelates suggests that the metal to ligand ratio is about 1:2. The polymer metal complexes were also characterized by IR, XRD, magnetic moments, and thermal analysis. The effects of pH and electrolyte on the metal uptake behavior of the resin were also studied. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 797–802, 2007     

关于软件对字符编码方式误判的研究

针对目前字符编码方式众多的现状,应用软件如何更好的判断文件编码属于何种字符集,并将其正确的解码成为不容忽视的问题。针对Windows记事本不能正常显示"联通"二字的Bug进行分析,利用Winhex软件解析文件获得16进制编码,根据得到的编码分析误判原因,通过注释记事本IsTextUTF8函数对分析得到的误判原因进行证实,进一步找到了更多Windows记事本无法正常显示的汉字。     

Cortex-A8平台的μC/OS-Ⅱ及LwIP协议栈的移植与实现

提出一种嵌入式实时操作系统设备实现接入以太网功能的方案。利用TI公司推出的TMS320DM8168 DaVinciTM数字多媒体处理器的Cortex-A8平台进行μC/OS-Ⅱ和LwIP协议栈的移植并实现嵌入式TCP/IP网络协议。通过对Cortex-A8内核体系结构研究,详细阐述了μC/OS-Ⅱ和LwIP针对Cortex-A8的移植要点与LwIP的高效邮箱机制的实现并给出部分关键代码。通过系统多任务调度及Web server功能应用的测试验证:移植操作系统运行正常,网络通信成功。在嵌入式设备上实现了嵌入式TCP/IP协议,使嵌入式实时操作系统设备具备了接入以太网的功能。