V_2O_5和SiO_2-V_2O_5导电膜的制备及性质

离子交换法制得V_2O_5凝胶和SiO_2含量低于50％(mol)的SiO_2-V_2O_5凝胶。借助透射电镜和电子衍射仪,研究了凝胶的结构,并用DTA-EGA和XRD分析了热处理过程中凝胶的物理化学变化。浸涂法制得V_2O_5和SiO_2-V_2O_3导电膜。凝胶具纤维状结构并含有V_2O_5·H_2O晶子。热处理温度影响膜的状态和电导率。电导率随温度升高,在305～315℃达最大值0.3 Ω~(-1)cm~(-1),温度进一步提高时将导致V_2O_5晶化和电导率下降。SiO_2的掺入提高膜的抗划伤强度并阻缓V_2O_5晶化,但是降低了电导率。     

等离子体镀光学薄膜的数学模型

从电离气体等离子体的基本性质入手,分析了处于等离子体中的基片表面鞘层及基片悬浮电位的形成,计算了正离子进入势垒到达基片的条件、基片的悬浮电位、到达基片的正离子流的密度,以及入射基片的正离子的能量,从而建立起等离子体镀光学膜的数学模型。     

闽江口晚第四纪海侵地层的研究

大量钴孔岩芯的岩性特征,微体古生物硅藻和有孔虫化石组合,以及~(14)C测年结果揭示,闽江河口区发育两期海侵地层。表明本区在晚第四纪期间至少经历了两次海侵事件,发生于距今44000～22000a的玉木亚间冰期海侵相对较弱,其范围仅达福州市区一带,另一次海侵发生于距今12000a以来的冰后期,该次海侵较为广泛,其范围可达闽侯的甘蔗一带。     

Al膜和衬底Ti间的反应和互扩散

本文研究了厚度为1.25μm Al 膜与 Ti 衬底间在580～800℃反应时,金属间化合物TiAl 及 Ti_3Al 的生长规律,并用 Boltzmonn—Matano—Heuman 和 Wagner 方程计算了Al 在化合物中的互扩散系数及扩散激活能,找出了扩散系数随温度和时间的变化规律.Al 在TiAl 及 Ti_3Al 中的扩散激活能 Q_r 及 Q_a,分别为0.73+0.1eV 和 0.59+0.1eV.     

Ecology and physiology of phototrophic bacteria and sulfate-reducing bacteria in marine salterns

Marine salterns are habitats for a large variety of halophilic bacteria. In the anoxic zones, halophilic sulfur bacteria develop mainly at the sediment surface, but only a few of them have so far been isolated from such environments. Among the phototrophic sulfur bacteria that sometimes form purple layers underneath the green cyanobacterial layers, members of the generaEctothiodhodospira, Chromatium (C. salexigens), Thiocapsa (T. halophila) were isolated. They grow by using sulfide as an electron donor. In the marine salterns, sulfide originates from active sulfate reduction. Among the halophilic sulfate-reducing bacteria, onlyDesulfovibrio halophilus andDesulfohalobium retbaense have so far been isolated. The ecology and physiology of both kinds of bacteria are discussed in this paper.     

Extraordinary levels of cadmium and zinc in a marine sponge,Tedania charcoti Topsent: inorganic chemical defense agents

The Antarctic marine spongeTedania charcoti has been shown to contain extraordinarily high natural concentrations of cadmium and zinc, which have in turn been correlated to the ability of the crude ethanol extract to modulate protein phosphorylation in chicken forebrain and to inhibit the growth of several test bacteria.     

金属载体上原位合成ZSM-5分子筛

以正硅酸乙酯(TEOS)和NaAlO2作为硅源和铝源，四乙基氢氧化铵(TEAOH)作为模板剂，用水热合成法在经表面处理的金属载体上原位合成了ZSM-5分子筛涂层，并采用BET、XRD、SEM等表征技术，研究了金属材料的处理方法、合成时间及次数等因素对ZSM-5分子筛涂层的结晶度、比表面积、覆盖率和涂层热牢固度的影响。结果表明，用原位合成法可以在金属载体上制得结晶度高、热牢固度好的ZSM-5涂层。     

海水鱼类单殖吸虫的研究Ⅷ寄生于Xia虎鱼鳃上指环虫两新种及一中国新记录

我们在整理采于广西和海南的单殖吸虫标本时 ,发现寄生于虎鱼鳃上的指环虫两新种 .并确认二翼指环虫ＤａｃｔｙｌｏｇｙｒｕｓｂｉａｌａｔｕｓＷｕ ,Ｗａｎｇ＆Ｊｉａｎｇ ,1 988为棘虎伪指环虫ＰｓｅｕｄｏｄａｃｔｙｌｏｇｙｒｕｓｈａｚｅＯｇａｗａ ,1 984的同物异名 ,且棘虎伪指环虫为中国新记录 .现报道如下 ,新种的模式标本保存于华南师范大学生物系 .1 .钦州指环虫 ,新种Ｄａｃｔｙｌｏｇｙｒｕｓｑｉｎｚｈｏｕｅｎｓｉｓｓｐ ｎｏｖ .(图 1 -ａ ,ｂ )图 1　钦州指环虫 ,新种Ｄａｃｔｙｌｏｇｙｒｕｓｑｉｎｚｈｏｕｅｎｓ…     

Change in the sedimentary environment of Wanquan River Estuary,Hainan Island,China

Pb geochronology and sediment core profiles of organic carbon, total sulfur and organic carbon isotope (d 13C) values were used to reconstruct the local environ-mental history of the Shamei Lagoon, located in the Wan-quan River Estuary, eastern Hainan Island, China. Totalsulfur and d 13C values decreased upwards in the top 30 cm of a sediment core that spanned the last 200 years of deposi-tion. Total sulfur concentration and d 13C values respectively decreased upward from 1.92% to 0.36%, and -20.63?to -23.64? The C/S ratio in the 19th century and earlier was relatively stable in the range of 0.47—0.80, and there was a positive correlation between organic carbon and total sulfur. Since around 1900 AD, the C/S ratio increased rapidly to a maximum of 3.94, but no simple correlation was found be-tween organic carbon and total sulfur during this more re-cent period. These results indicated that before 1800 AD, the lagoon had a fully marine character, and the location of to-day抯 Wanquan River Estuary was an open embayment.From 1800 to 1900, the salinity of Shamei Lagoon decreased noticeably. The amount of seawater which could enter thelagoon decreased gradually as the Yudai spit grew. Today,seawater scarcely affects the lagoon; it is essentially a fresh-water basin.