聚苯胺的掺杂及其导电性能研究

利用对甲基苯磺酸（ＴＳＡ）和磺基水杨酸（ＳＳＡ）对聚苯胺（ＰＡｎ）进行了掺杂，研究了在掺杂过程中浓度、温度及时间对聚苯胺电导率的影响，并对掺杂态ＰＡｎ在空气中电导率与温度的关系进行了研究，结果表明ＴＳＡ和ＳＳＡ掺杂的ＰＡｎ在研究的温度范围内电导率均随温度的提高而增加。     

多效唑对幼年桃树生长发育的影响

多效唑施于土壤中，对雨花露桃的营养生长有明显的抑制作用，但能增加叶绿素含量，促进成花，改变果形指数；在蟠桃上叶面施多效唑对其营养生长和生殖生长影响不明显，但明显地改变果形指数。土壤的最佳处理浓度为０．８ｇ／ｍ＾２。     

主、副梢叶片之间的比例关系对葡萄浆果生长发育和品质的影响

对五年生葡萄品种“早生高墨”在果实转色期采用对主、副梢摘叶的办法使每个结果枝的总叶面积保持在１５００ｃｍ２，果穗以上的叶面积保持１０００ｃｍ２，并且从果穗至顶端的副梢叶面积所占百分率分别为１００（处理）、７０（处理２）、３０（处理３）和０（处理４）．结果表明，处理１和处理２结果枝上的浆果成熟速度比处理３和处理４要快，而且前两者浆果中的总可固物和花青甙的积累速度比后两者快．与此相反，前两者结果枝上浆果中可滴定酸的含量比后两者迅速减少．在浆果成熟阶段，副梢叶片的净光合速率（Ｐｎ）比主梢叶片高，尤其是基部主梢叶的净光合率（Ｐｎ）显著地偏低，处理４结果枝上的浆果成熟期明显地推迟。在浆果转色前进行测定时，主、副梢叶片之间无论是内部结构，还是矿质营养的含量均无明显的差异．试验还对处理和未处理的主、副梢上的叶片净光合率（Ｐｎ）进行了测定。     

多电极电磁血液流速仪仿真建模研究

基于电磁流量计权函数理论,将多电极电磁测量方式应用于肢体动脉、静脉血液流速测量。通过将流动截面处划分为不同的区域,利用权函数理论重构流动截面处不同区域内的平均轴向速度值,实现对动脉、静脉血管中互为逆向流动的速度信息测量。在此基础上,通过获取不同位置的弦端电压,利用区域权函数的计算方法,确定流动截面上不同位置的权函数,进而计算流动截面处各个区域的局部轴向平均速度。三维有限元模型仿真和计算结果表明电极的位置、数量以及不同的划分方式重构结果不同,实现了速度重构并测量了局部速度分布。     

残余应力场对焊接动态变形的影响

通过一组窄板小型焊接变形试验,证明了残余应力场对焊接构件的动态变形过程,因而也对焊件最终的残余变形有着不可忽视的影响。其机理为:焊接过程中力学熔池的运动干扰了焊件中原有残余应力场的平衡,引起焊件的附加变形。附加变形既改变了焊件高温区的压缩塑性变形,又改变了焊件冷却阶段的变形。     

人αB干扰素基因在PGK1启动子和α因子前导序列控制下在酵母中的表达和分泌

借助化学合成的寡聚核苷酸接头将酵母PGK1启动子和α因子前导序列相连构建成一个αB干扰素基因的分泌表达载体YFD65.含质粒YFD65的酵母菌BJ1991能分泌表达αB干扰素,分泌到培养基中的αB干扰素的量为10~8U/L.     

基于偏振复用和反射式半导体光放大器的WDM-RoF-PON系统设计

基于偏振复用原理和反射式半导体光放大器RSOA(reflective semiconductor optical amplifier)的再调制特性,融入了光载无线RoF(radio over fiber)技术,设计了一种新型的可以实现多种信号混传的波分复用无源光网络WDM-PON(wavelength division multiplexing passive optical network)系统。在中心站,无线信号和有线信号同时调制到两个偏振态正交的光载波上,并耦合到标准单模光纤中传输。在基站,将两个偏振态正交的信号分离后,一方面可以探测得到四倍频毫米波信号和有线信号,另一方面还可以通过RSOA实现载波重用。通过Optisystem软件对该系统进行模拟仿真,得到了调制信号的光谱和接收端信号的眼图,分析了传输信号误码率与接收光功率的关系,结果表明,该系统传输性能良好。     

Improving the photocatalytic activity of graphitic carbon nitride by thermal treatment in a high-pressure hydrogen atmosphere

Extending visible light absorption range and suppressing the recombination of photogenerated charge carriers are always important topics in developing efficient solar-driven photocatalysts. In this study, the thermal treatment process at 400 °C in a high-pressure hydrogen atmosphere was applied to modify graphitic carbon nitride. Compared to the normal atmospheric hydrogen treatment process, this process has the merit of producing nitrogen deficient graphitic carbon nitride in high-yield. The optimal photocatalytic activity of modified graphitic carbon nitride was demonstrated by controlling the treatment duration in the hydrogen atmosphere.The changes in the crystal structure, microstructure and optical properties of carbon nitrides were investigated by several characterizations. The relationship between the photocatalytic activity and structures of graphitic carbon nitride was preliminarily established. The results obtained in this study could provide some new ways of improving the activity of graphitic carbon nitride based photocatalyst.     

Redox condition during Ediacaran–Cambrian transition in the Lower Yangtze deep water basin,South China: constraints from iron speciation and δ~(13) Corg in the Diben section,Zhejiang

Cherts of the Piyuancun Formation and black mudstones of the Hetang Formation in Diben Town, Kaihua County, Zhejiang were deposited in a deep water basin of the Lower Yangtze area during the Ediacaran–Cambrian transition(E–C transition), offering an opportunity to reconstruct the ancient redox condition of the deep water basin. Total 53 samples were collected and analyzed for iron speciation, including pyrite iron(FePy), carbonate associated iron(FeCarb), iron oxide and hydroxide(FeOx),magnetite iron(FeMag) and total iron(FeT) as well as d13 Corgto gain a deeper understanding of specific redox condition during the period. The results show that(1) most samples have pyrite concentration \1 %, with the FePy/FeHR ratio ranging from \0.01 to 0.81(mostly \0.5), and the FeHR/FeT ratio between 0.39 and 0.93(mostly [0.5).(2) The E–C boundary in the Diben section occurred at the maximum negative excursion of organic carbon isotope within the Piyuancun Formation, which can be correlated with other sections by using d13 Corg. We thus concluded that the relatively high content of highly reactive iron and low content of pyrite iron in the Diben section indicate a minor occurrence of H2 S and a predominance of anoxic and ferruginous environment, which is similar to other reported sections such as the Longbizui and Yanwutan sections, western Hunan. In addition, oxygen concentration in sea water showed an increasing trend in the interval corresponding to the bottom and upper layer of the Hetang Formation as indicated by the FeHR/FeT ratio, which decreased from 0.7 to 0.38, however, it was not great enough to oxidize the whole deep water. Therefore, during the E–C transition deep water basin in South China was most likely an anoxic and ferruginous enrironment, which prevented metazoon from the evolution in the deep water basin. Our work offers an important reference to better understanding of the spatiotemporal occurrence and dynamic processes of the ‘‘Cambrian Explosion'.