有机分子组装体系的扫描隧道显微镜研究

利用长链烷烃取代基与石墨表面的较强相互作用,可以获得烷基取代的有机小分子(酞菁、卟啉、碱基)的高分辨STM图像。理论分析表明,这些分子的吸附稳定性来源于长链烷基与石墨间较强的范德华相互作用,以及长链烷烃链间的二维结晶能。分子在表面的吸附组装结构受到分子与基底间、吸附分子间,以及溶剂与分子间作用的共同影响。对于长链烷基取代的碱基分子在石墨表面的组装结构中,分子的排列方式不仅受到烷基链与石墨间较强的取向匹配的作用,碱基分子间形成的多个氢键以及芳环离域π键的作用也会影响分子的排列方式,并且是造成烷基取代碱基分子组装结构多样性的原因。扫描隧道谱研究表明,硫醇在Au表面的自组装分子膜对电流的整流作用,来自于分子中巯基与Au表面形成的双电层,而不对称取代的NtBuPc分子在石墨表面的LB膜的电流整流行为,来源于分子内部的不对称电子结构     

Anomalous hopping and tunneling effects in a new aluminum film percolation system

A new aluminum thin film percolation system, deposited on glass and silicon wafer surfaces by a vapor deposition method, was investigated. By using the expansive and mobile behaviors of the silicone oil, the Al films are quenched gradually by the silicone oil during the deposition process. TheR-I behavior of the film system was studied, and the anomalous conductivity indicated that, at very low current, the hopping and tunneling effects in the films are much stronger than those of the normal film systems. Project supported by NSFC (Grant No. 19874016) and the Special Fund of Zhejiang Provincial Natural Science Foundation for Young Scientists (Grant No. 1997-RC9603).     

普掘快速掘进工艺改造

通过对普掘所用设备、施工工艺进行客观剖析,指出耙岩机、皮带分体式配合在生产实践中的不足之处,进而提出合理的设备改造和施工工艺改进方案可以实现快速掘进的目的,并在实践中创造出良好的经济效益,为提高矿井经济运作和生产正常接替提供可靠保障.     

初探石墨薄膜的表面结构及导电性

论述了在常温下和在大气状态下,扫描隧道显微镜（STM）在石墨薄膜表面上的电场加工实验,并对作用机理进行了分析,认为表面结构现象生成是场蒸发效应作用的结果,其导电性受外电场力的大小和薄膜层数之间的束缚力的影响。     

数码显微互动教学促进新一轮生物学实验的创新

文章介绍生命科学院数码显微互动实验室的建设，探讨了数码显微互动技术进行生物学科基础教学实验的应用，有力地提高了实验教学效率与质量，激发了学生学习实验操作技能的积极性，学习效果显著提高，     

激光扫瞄共聚焦显微技术实验教学的思考

开设激光共聚焦技术实验课，通过仪器演示和实验操作，帮助学生理解课堂的理论教学内容，了解和掌握这门新技术，为他们在未来科研工作中利用该技术进行科学研究奠定基础。     

Microscopic Analysis of Wall Painting Techniques: Laboratory Replicas and Romanesque Case Studies in Southern Switzerland

The identification of painting techniques is an important aspect of any research related to historical, artistic, and conservation issues in the field of wall paintings conservation. There are a variety of different methodological approaches that can be used to identify wall painting techniques. In this study, the application of optical (PLM) and electron (SEM-EDX) microscopy was explored as they are complementary analytical techniques commonly used for micro-stratigraphic analysis of painted surfaces. Five replicas were prepared according to the technical procedures reported in medieval historical treatises, and the pigment was applied at different time intervals in order to monitor the modifications at the interface between the ground and pictorial layer. The comparison of data from the replicas with samples from Romanesque wall paintings in churches in Southern Switzerland and Northern Lombardy (Italy) allowed for an evaluation of the reliability of the proposed methodology and for the interpretation of the painting techniques.     

过氧化氢酶晶体高分辨成像的图象处理

过氧化氢酶晶体的高分辨成像,由于样品本身衬度极低和为防止辐射损伤而使用极低剂量的电子束照明,因而所得象的噪声远大于结构信息,此外图象被电镜相位衬度传输函数所调制.本文讨论了过氧化氢酶高分辨显微象的处理方法.是为了发展二维生物大分子晶体高分辨电子显微象的分析方法.     

Deconstructing Rattan: Morphology of Biogenic Silica in Rattan and Its Impact on Preservation of Southeast Asian Art and Artifacts Made of Rattan

Rattan, a climbing palm of the tropical region of Southeast Asia (SEA), supplied material for objects of myriad purposes including ceremonial, religious, utilitarian, and artistic as exemplified by the collections at the National Museum of Singapore, Asian Civilization Museum, and the Singapore Art Museum. The aim of this analysis of rattan is to further the understanding of rattan, in particular its surface, and to propose a protocol-enabling positive identification of rattan in artifacts, thus guiding conservation decisions. The rattan surface defines an artifacts esthetic appearance and stability, and understanding its characteristics is essential to the development of an informed preservation strategy. Rattan epidermis morphology, topography, and cellular structure were characterized by a multi-scale and a multi-sensory approach using optical microscopy, confocal laser scanning microscopy, and field-emission scanning electron microscopy (FESEM). The chemical composition was analyzed with energy dispersive X-ray spectroscopy and macro-X-ray fluorescence spectroscopy (m-XRF) and indicated the presence of a siliceous compound, biogenic silica, in the epidermis and phytoliths in vascular tissue. A parallel analytical protocol was applied to samples extracted from museum artifacts (nineteenth-twentieth century) and contemporary objects acquired during field studies in Indonesia, Malaysia, Myanmar, and Cambodia. The methods of processing rattan have a direct impact on the siliceous layer thus leading to a better understanding of surface patterns found on artifacts. An attempt to find correlations between the percentage of silica and thickness of the siliceous layer did not produce conclusive results; both varied greatly in all studied examples. Darkening of rattan was clearly associated with aging but did not indicate any distinct effect on the chemical composition of the outer layer. The chemical analysis of the biogenic silica layer combined with recording methods of processing rattan observed during field studies in SEA provide a basis for a better understanding of rattan collections in the museum context.     

利用STM进行石墨表面纳米结构的研究

论述了在大气状态下扫描隧道显微镜STM在石墨表面上的电场加工实验,并对作用机理进行了分析,认为表面结构的生成是场蒸发效应和化学反应(局部气化反应)的综合作用。