Valence of elements in HgBa2Can-1CunO2n+2+delta (n=1, 2, 3, 4)

Valence of elements in HgBa2Can-1CunO2n+2+delta (n=1, 2, 3, 4) (both argon and oxygen annealed samples) were calculated. The result indicated for both argon and oxygen annealed samples, Hg had the lowest valence for the highest T-c sample. For fixed n, the valence of Cu in oxygen annealed samples was larger than that in argon annealed samples, indicating that oxygen annealed samples produce more carriers than argon annealed samples.

Sol-gel deposition of calcium silicate red-emitting luminescent films doped with Eu3+

Eu3+-activated calcium silicate (CaO-SiO2:Eu3+) luminescent films were prepared by the sol-gel method. The structural evolution of the film was studied by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), and the luminescence properties of the phosphor films were investigated as a function of heat treatment temperature. The XRD study indicates that a kilchoanite phase forms in the film sintered at 800 degreesC, which is different from that in gel powder treated under the same conditions. The SEM results show that the film thickness decreases and the particles in the film become smaller with increasing heat treatment temperature. The CaO-SiO2:Eu film shows the characteristic emission of Eu3+ under UV excitation, with the Eu3+ D-5(0)-->F-7(2) band (616 nm) being the most prominent. A large difference in the Eu3+ lifetime is observed between the film samples treated at 500 and 700 degreesC (or above). Concentration quenching occurs when the Eu3+ doping concentration is above 6 mol% of Ca2+ in the film.

非均匀化处理稀土铝合金的组织结构

通过在6063变形铝合金中添加适量的稀土元素，免去了在挤压前的高温均匀化处理。试验结果表明，合金的结构和性能得到了改善，可应用于型材的生产。

Dynamic mechanical properties of interpenetrating polymer networks based on polyacrylates and epoxy

Interpenetrating polymer networks (IPNs) based on polyacrylate (poly(polyethylene glycol diacrylate), PEGDA) and epoxy(diglycidyl ether of bisphenol A, DGEBA) were prepared simultaneously Dynamic mechanical properties of the SINs (simultaneous interpenetrating networks) with various compositions were studied. Enhanced mechanical properties were found in this case. From the point of view of pre-swollen networks, all of the PEGDA/DGEBA IPNs were composed of the individual pre-swollen networks. A micro-phase segregation system was produced in the SIN. Glass transition temperatures shifted inward, which was attributed to molecular packing effects or mutual-entanglements of molecular segments among the individual pre-swollen networks. In accordance with the additivity of properties, namely the parallel model, the entanglement density between the two polymer networks reached its maximum at 50/50 PEGDA/DGEBA IPN.

聚吡咯型内参比电极在氰亚金酸根离子选择电极中的行为

我们采用长链季铵盐活性材料研制成的电极具有选择性好的优点,用直接转形法,免去制备活性材料的繁琐,内参比选用碳棒上电聚合导电高分子,后来,改用铅笔芯替代碳棒,实验效果相同,在国内外还是首次,这种内参比电极制备简单,电位稳定,而且不易损坏。使用寿命5个月左右。选择性较好,电极斜率为59mV/pC。

ELECTROCHEMICAL STUDY OF PYRAZOLONE DERIVATIVES AT THE LIQUID/LIQUID INTERFACE

Pyrazolone derivatives, such as antipyrine, aminopyrine, and 4-aminoantipyrine, can transfer across the water/nitrobenzene interface to produce a pair of well-defined symmetric, reversible anodic-cathodic peaks by cyclic voltammetri. The transfer mechanis

氨基酸植物组织传感器的研究

选择苹果及仙人球的组织切片作生物催化材料,同氨气敏电极组合,研制了2种对L-谷氨酰胺及L-天冬酰胺选择响应的新型的组织传感器。研究和讨论了传感器的最佳工作条件。用该组织传感器测定了L-天冬酰胺脱氨酶和L-谷氨酰胺脱氨酶的动力学参数K_m和V_m。

Source of a floating dust episode over the Qingdao region and dust throughput to the ocean

A floating dust weather happened on March 11-12, 1995 over the Qingdao region. Its sources and throughput to the ocean were studied. The result indicated that the floating dust was caused by the dust storm that starred in northwestern China and developed in northern China. 21 x 10(6)t fine soil particles were carried to the ocean during the episode.

胶州湾及其邻近海域的浮游植物－种类组成与数量变化

研究胶州湾浮游植物的物种组成与时空分布的特点，对于了解该湾生态系统的现状与历史变化趋势以及生态系统对自然条件变化和人类干扰的响应具有重要意义。 本文根据2004年每月一次采集的浮游植物样品，分析了胶州湾浮游植物的物种组成和优势种的时空分布情况。调查发现浮游植物共142种，分属于6门53属，其中硅藻门40属113种，占总物种数的79.6%；甲藻门10属24种，占总物种数的16.9%；其它为金藻门1属2种，裸藻1属1种，绿藻1属2种。浮游植物丰度周年波动范围为11.12－14602.39×104cells/m3，全年平均为1857.55×104cells/m3。全年丰度最高的藻为环纹劳德藻(Lauderia annulata)，出现在2月份，而全年的丰度最高值也出现在2月份。在胶州湾中，硅藻所占比例最大，平均为97.44%，最高为99.95%，最低为82.55%。浮游植物的丰度的周年变化：有两个高峰，分别出现在2月份和10月份，是典型的温带海域双高峰的分布形式。 胶州湾浮游植物的优势种分析，采用Kikvidze等（2002）提出的确定优势种数量的计算方法，再依据各物种的优势度排序最终确定优势种。其中在多样性最低的6月和10月，优势种数目均为1种，分别为丹麦细柱藻（Leptocylindrus danicus）和中肋骨条藻（Skeletonema costatum）。而在多样性指数较低的1月、2月，优势种数目分别为2和3；而在物种多样性比较高的5月、7月、11月，由于分布相对比较分散，所以优势种数量较多。这说明这个方法可以较好地完成对胶州湾浮游植物群落分析时确定优势种的目标。优势种出现频率较多的种类为中肋骨条藻（1、3、4、5、8、10、11、12月）、洛氏角毛藻(Chaetoceros lorenzianus)（7、8、9、11、12月）、尖刺拟菱形藻(Pseudonitzschia pungens)（2、3、5、7月）、加拉星杆藻(Asteronella kariana)（1、2、3、5月）、密联角毛藻(Chaetoceros densus)（5、11、12月）、扭鞘藻(Streptothece thamesis)（7、8、9月）、夜光藻(Noctiluca scintillancs)（4、5、7月）、奇异菱形藻(Nitzschia paradoxa)（5、11、12月）,对这些种的时空分布进行了分析。 对2004年胶州湾的浮游植物数据进行分层聚类分析后，发现可以将胶州湾划分为三个海区：湾南与湾外海区、湾中西部海区、湾东海区。

山东半岛月湖潮汐汊道沉积物输运与堆积

月湖，又称天鹅湖，位于山东半岛最东端荣成湾顶的西南侧。面积约4.94 Km~2，西、北、南侧为陆地所包围，东部由荣成湾沙坝与外海隔开，东南部有一132m宽的潮流通道与外海相通，它由涨潮三角洲、落潮三角洲、纳潮盆地和潮汐通道四部分组成，是一个典型的潮汐汊道系统。1998年11～12月和1999年8～9月两次对月湖的沉积物特征，水动力条件，地貌特征做了广泛、深入的调查研。研究结果表明：月湖水深比较浅，大部分地区在1到1.5 m之间；底质呈环状分布，从湖边缘到中心依次为：砾质砂、泥质砂、砂质泥和泥，湖中心柱状样由粉砂或粘质粉砂组成，平均含水量为54.67％，平均有机碳含量为2.7％，测得沉积速率为1.49cm a~(-1)，沉积通量为1.04 g cm~(-2) a~(-1)有机碳通量为0.028 g cm~(-2) a~(-1)；月湖潮汐为不正规半日潮，日不等现象显著，口门主水道涨潮历时短，流速小，落潮历时长，流速大；口门主水道泥沙向外海搬输运，悬移质输运量比底移质输运量小近两个数量级；湖内沉积物粒径趋势分析表明沉积物由四周向湖心搬运。在过去的二十年里，由于人类对月湖的不合理开发和利用（在口门修建蓄水闸，虾池悬垦），造成泥沙大量淤积，使生态系统稳剧退化。如果不采取有效措施，月湖很快就会消失。