有理数域的子环和子环格

说明了有理数域的任一子环的结构、证明了有理数域的所有子环在包含关系下所成的完备格与所有素数的集合的幂集合在包含关系下所成的完备格完备反同构。     

带有反平方势的含时谐振子的求解及其应用

用时空变换法求解了带有反平方势的含时谐振子薛定谔方程，并讨论了方程的本征能量和能有简并情况。本文的工作与处理Ｐａｕｌ阱中囚禁离子的运动有一定联系。     

垂直激励下的二段复合颗粒链研究

实验研究了二段复合颗粒链在垂直振动激励下的动力学特性. 通过对颗粒链整体的运动状态以及与之相关的相位差、膨胀尺度、质心位移以及能量的分析发现, 不同颗粒排布组合在实验中表现出的特性有很大差别. 我们认为产生这一现象的原因在于不同颗粒段交界处界面效应的存在. 界面效应在不同的颗粒排布下造成不同的能量分布, 从而导致颗粒链出现不同的运动状态.     

基于WIFI的嵌入式目标定位与检视终端

针对大型工程中机械操纵人员由于不知道其他机械的位置和工作情况而造成配合不默契，工作效率低，不能顺利完成整个工程的问题，提出了一种应用于大型施工团队等需要互相传输图像信息和位置信息场合的嵌入式终端。通过了解在本终端上显示的其他终端位置信息和图像信息，可以有效地促进团队间的相互配合，提高工作效率。将嵌入式处理器、无线网络、摄像头和GPS(Global Positioning System)模块相结合，设计了基于WIFI(Wireless Fideliy)的嵌入式目标定位与检视终端，实现了终端间位置信息和图像
信息的交互。给出了系统整体方案，论述了终端硬件接口与软件流程，经过调试与实验表明，系统运行稳定，位置信息与图像信息传输速度优良，并且信息完整可靠，达到了预期效果。     

根癌农杆菌介导的丝状真菌简青霉遗传转化的研究

利用根癌农杆菌LBA4404介导,建立了丝状真菌简青霉(Penicillium simpli-cissimum)H5的遗传转化系统.潮霉素抗性筛选、PCR和Southern blot分子鉴定等结果表明:筛选获得的转化子能够稳定遗传,外源的T-DNA以单拷贝随机整合到简青霉的基因组中.实验初步研究了农杆菌浓度、乙酰丁香酮浓度和共培养时间等因素对转化效率的影响,经过优化后转化体系的效率可达50个转化子/105个孢子.农杆菌介导的遗传转化方法在简青霉上的运用,将为研究该菌的基因工程改造提供强有力的工具.     

A cloud of laser cooled 40Ca+ in a linear ion trap

A cloud of ⁴⁰Ca⁺ is successfully trapped and cooled using the radiation of a red-detuned 397 nm laser beam and a resonant 866 nm laser beam in our prototype linear ion trap, which was designed and constructed for studying quantum information processing. We have characterized the size of the ion cloud, estimating the temperature to be in the order of milli-Kelvins.     

Patterning organic single-crystal transistor arrays

Field-effect transistors made of organic single crystals are ideal for studying the charge transport characteristics of organic semiconductor materials. Their outstanding device performance, relative to that of transistors made of organic thin films, makes them also attractive candidates for electronic applications such as active matrix displays and sensor arrays. These applications require minimal cross-talk between neighbouring devices. In the case of thin film systems, simple patterning of the active semiconductor layer minimizes cross-talk. But when using organic single crystals, the only approach currently available for creating arrays of separate devices is manual selection and placing of individual crystals-a process prohibitive for producing devices at high density and with reasonable throughput. In contrast, inorganic crystals have been grown in extended arrays, and efficient and large-area fabrication of silicon crystalline islands with high mobilities for electronic applications has been reported. Here we describe a method for effectively fabricating large arrays of single crystals of a wide range of organic semiconductor materials directly onto transistor source-drain electrodes. We find that film domains of octadecyltriethoxysilane microcontact-printed onto either clean Si/SiO(2) surfaces or flexible plastic provide control over the nucleation of vapour-grown organic single crystals. This allows us to fabricate large arrays of high-performance organic single-crystal field-effect transistors with mobilities as high as 2.4 cm(2) V(-1) s(-1) and on/off ratios greater than 10(7), and devices on flexible substrates that retain their performance after significant bending. These results suggest that our fabrication approach constitutes a promising step that might ultimately allow us to utilize high-performance organic single-crystal field-effect transistors for large-area electronics applications.     

具有特殊晶面立方体Cu2O/C3N4中空管的制备及其光催化性能研究

通过湿化学法将具有特殊晶面的立方体Cu2O原位生长在C3N4管上,得到了Cu2O/C3N4异质结.利用立方体Cu2 O的高稳定面(100)晶面改善Cu2 O的稳定性,再利用C3 N4的光催化作用共同促进光催化活性.具有特殊晶面的Cu2 O纳米颗粒尺寸较小(约300 nm),并且具有较大的比表面积,同时也增大了Cu2O/C3N4复合材料的比表面积(275 m2·g-1),提供更多的反应活性位点.Cu2 O与C3 N4相比带隙较小,有助于调整Cu2 O/C3 N4复合结构的吸光范围以及价带位置.因此,具有特殊晶面的Cu2 O和C3 N4构建的异质结能有效地促进光生载流子的分离与迁移,从而提高光催化活性,Cu2 O/C3 N4复合材料在光催化降解四环素反应中降解率高达98％.     

A novel element (NIRS) participates in the regulation of interleukin 2 receptor α gene expression

A novel element at −153/−143 bp in the interleukin 2 receptor α (IL-2Rα) gene has been coined as NRE-inverse repeat sequence (NIRS) due to its inversely repeated to the known negative regulatory element (NRE) further upstream of the gene. In order to explore the role of NIRS in the expression of IL-2Rα gene, luciferase reporter plasmids driven by 4 individually deleted IL-2Rα genes promoter regions were constructed. Transfection of the reporter plasmids into Jurkat cells and HeLa cells respectively, we found that both NIRS and NRE were critical for repressing the constitutive expression of IL-2Rα gene and were also necessary for promoter activity induced by PHA. EMSA results showed that double-stranded NRE-and NIRS-binding proteins existed in both HeLa cells and Jurkat cells. However, single-stranded NIRS-and NRE-binding protein was only found in HeLa cells. Interestingly, the supershift band showed up in EMSA system with Jurkat cells (no matter whether activated or not) adding to the cell lysate of HeLa cells. UV-crosslinking showed a double stranded NRE-and NIRS-binding protein p83 in both Jurkat cells and HeLa cells. Our results suggest that trans-acting factors play a key role in regulating promoter activity of IL-2Rα gene by interacting with double or single stranded NRE and/or NIRS selectively in different cells.     

近海近岸海浪的研究进展

从海浪谱、风浪及涌浪的预报方法、卫星海洋学及资料同化在波浪计算中的应用、增减水和环境流对波浪相互作用5个方面对近海近岸波浪的研究成果进行了较为系统的归纳总结和评述。在此基础上分析了近海近岸海浪研究的发展趋势，提出今后的研究方向。