双漂移谐波聚束器的物理设计

为了满足北京放射性核束装置计划中超导直线助能器对ＨＩ－１３串列加速器束流脉冲化系统的要求，同时兼顾目前快中子飞行时间测量实验的需要，进行了双漂移谐波聚束器的物理设计。聚束器基频为６ＭＨｚ，可以对质子、氘直至铯等所有离子束进行脉冲聚束，束流利用效率可达５０％—６０％，质子等轻离子脉冲束的脉冲时间宽度小于１ｎｓ。设计中分析了串列加速器束流传输系统中影响脉冲束流性能的各主要因素，通过束流纵向相空间的传输模拟计算，获得了满意的结果。     

Study on phase behavior–impact strength relationship of unsaturated polyester/polyurethane hybrid polymer network

The phase behavior of a hybrid polymer network (HPN) composed of poly[(propylene glycol maleate)-co-(propylene glycol phthalate)] crosslinked with styrene and polyester–urethane crosslinked with methylene-bis-ortho-chloroaniline was examined. The correlation between phase separation and impact strength of the HPNs is discussed. The composition of HPNs has an effect on their properties.     

PATTERN MAPPING ON BETA-SPLINE SURFACES——BILINEAR MAPPING METHOD

Texture pattern mapping is one of the most important techniques for high quality image syn-thesis. It can largely enhance the visual richness of raster-scan images. In this paper is presented a newmethod of mapping planar texture pattern onto beta-spline curved surfaces——bilinear mapping methodwhich can map planar texture pattern onto curved surfaces with less distortion, and also can fulfill thegeometric transformation of the texture pattern on the curved surfaces by operating the pattern win-dow. It is valuable to both CAD/CAM in artistic field and computer graphics.     

溅射TiN薄膜的机械性能与光学性质

运用直流磁控溅射技术,在加温与具有偏压的硬质合金与奥氏体不锈钢衬底上,在N_2与Ar压强比在3%～13%内沉积TiN薄膜。对这种TiN薄膜的机械与光学性能作了研究,测定了它们的表面粗糙度、显微硬度可达23520N/mm~2和划刻临界负载可达80N,给出了TiN薄膜晶格常数变化与SEM的断面形貌图。测定了两种基体上TiN薄膜的近于垂直的镜反射率、漫反射率与总反射率。还确定了TiN薄膜的光学常数n—折射率,k—消光系数。     

Association of focal adhesion kinase with its potential substrate phosphatidylinositol 3-kinase

The focal adhesion kinase (FAK) has been implicated in signal transduction pathways initiated by cell adhesion receptor integrins and by neuropeptide growth factors. To gain insight into FAK function, we examined the potential interaction of FAK with intracellular signaling molecules containing the Src homology 2 domains. We report here the stable association of FAK with phosphatidylinositol 3-kinase (PI3-kinase; EC 2.7.1.137) in NIH 3T3 mouse fibroblasts. This interaction was stimulated by cell adhesion concomitant with FAK activation. We also found that recombinant FAK bound to the p85 subunit of PI 3-kinase directly in vitro and that autophosphorylation of recombinant FAK in vitro increased its binding to PI 3-kinase. We detected increased tyrosine phosphorylation of the p85 subunit of PI 3-kinase during cell adhesion and observed direct phosphorylation of p85 by FAK in vitro. Together, these results suggest that PI 3-kinase may be a FAK substrate in vivo and serve as an effector of FAK.     

Supercritical synthesis and characterization of SWNT-based one dimensional nanomaterials

The present study developed a novel, fast and efficient method to synthesize one dimensional nanotube-based materials via supercritical reactions and supercritical fluids. It was proved that supercritical organic fluids were good media to take materials into the nanocavity, not only as solvents but also as reaction agents. Different kinds of metals (Ni, Cu, Ag) and fullerenes (C(60), C(70), C(78), C(84), Gd@C(82), Er@C(82), Ho@C(82), Y@C(82)) were successfully inserted into nanotubes with small diameters by this technique, with various supercritical fluids such as C(2)H(5)OH, CH(3)OH or C(6)H(5)CH(3). The filling rates were proved to be more than 90%. The high filling efficiency and the properties of the as-generated materials were characterized by TEM, Raman, EDS and XPS. In principle, this technique can be applied to construct new types of nanomaterials, if we choose the appropriate supercritical reaction and fluid in the CNTs.     

Mapping flows of embodied emissions in the global production system

Environmentally extended multiregional input-output (MRIO) analysis can be used to investigate final production and consumption attributions of emissions. As the distinction between the two attributions has been brought to the attention of policy-makers, there is an ever greater need to understand how and why they differ, by analyzing the connections between production and consumption activities. Seeking to meet this need, we present an approach for mapping flows of embodied emissions through a Leontief production system. The approach, seen as an extension of Structural Path Analysis (SPA), provides an exhaustive map of supply chain linkages between final production and consumption attributions of emissions. Whereas SPA is traditionally used to extract and rank individual supply chains according to the emissions occurring at the end of each chain, the mapping approach considers emissions embodied in the flows of intermediate products linking different economic sectors along supply chains. Illustrative results are presented from a global MRIO model and CO(2) emissions for 2004. The emissions embodied in a sector's total output of products is also of interest: a method for calculating this is presented and shown to provide further insight into where in the production system a sector's overall emissions impact is concentrated.