大理盆地隐仙溪河道沉积物粒度分布特征

通过单人系统取样,用筛析法对云南大理盆地隐仙溪河道沉积物进行了粒度分析。结果表明,河流上游以砾石沉积为主,平均质量分数(含量)达57.92%以上,砾石粒径以10～50cm为主,在砂质沉积物中以粗砂为主,其含量达28 35%,中细砂含量只有13.76%;河流中游虽然也以砾石沉积为主,但砾石粒径明显变小,以5～10cm为主;河流下游则以砂质沉积物为主,其中中砂、细砂和粉砂总含量高达77.64%,尤其是细砂和粉砂含量显著升高,分别达到27.96%和32.26%,而粗砂和砾石含量明显降低。不同河段沉积物粒度及其含量的变化主要受水动力条件、地形坡度和搬运距离控制,但搬运距离与沉积物粒度之间不存在简单的线性对应关系。     

长江口与杭州湾风暴潮三维数值模拟

基于改进的河口海岸和海洋三维数值模式ECOM-si，加入台风模型气压场和模型风场，同时考虑径流、天文潮与风暴潮耦合作用，数值模拟了TC9711（Winnie），TC0012（Prapiroon）和TC0014（Saomai）三个台风期间长江口和杭州湾的水位过程.与观测资料比较，模式较好地再现了台风期间的水位过程，采用Fujita（藤田）气压场公式计算的结果比Fujita Takahashi（藤田 高桥）气压场公式下的计算结果更符合实测值，并在上述3个台风期间计算水位值与观测值的均方误差分别为42.5 cm，41.7 cm，35.5 cm.     

Study of titanium nitride for Iow-e coating application

The paper reports our novel work on chemical vapor deposition coating of titanium nitride （TIN） thin film on glass for energy saving. TiN films were deposited on glass substrates by atmospheric pressure chemical vapor deposition （APCVD） using titanium tetrachloride （TiCl4） and ammonia （NH3） as precursors. As a result, TiN films with a thickness of 500 nm were obtained. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, atomic force microscopy （AFM）, four-point probe method and optical spectroscopy were respectively employed to study the crystallization, microstructure, surface morphology, electrical and optical properties of the coated TiN films. The deposited TiN films are of NaCI structure with a preferred （200） orientation. The particles in the film are uniform. The reflectivity of the TiN coating in the near-infrared （NIR） band can reach over 40%, the visible transmittance is approximately 60%, and the visible refiectivity is lower than 10%. The sheet electrical resistance is 34.5 Ω. According to Drude theory, the lower sheet resistance of 34.5 Ω gives a high reflectivity of 71.5% around middle-far infrared band. The coated films exhibit good energy-saving performance.     

Rationalization and Mechanisms of Pulsed Laser Deposition of Fibroin Nanofilms by Using Autogenous Binder

1 Results Homogeneity of fibroin thin films by pulsed laser deposition (PLD) was significantly improved by introducing autogenous binders to consolidate and homogenize the irradiation targets.Homogenization includes among others,decreases in the size of nanostructural units and the fractional debris.Simultaneously,the deposition rate was substantially increased.Autogenous binders are prepared via degumming and liquefaction of fibroin by using Na2CO3 and LiBr,respectively.We also found that optically hom...     

Development of Diamond-Coated Drills

Compared with the sintered polycrystalline diamond, the deposited thin film diamond has the great advantage on the fabrication of cutting tools with complex geometries such as drills. Because of their low costs for fabrication equipment and high performance on high speed machining non-ferrous metals and alloys, metal-compound materials, and hard brittle non-metals, diamond-coated drills find great potentialities in the commercial application. However, the poor adhesion of the diamond film on the substrate...     

沙尘暴细颗粒物无机组分的漫反射红外傅立叶转换光谱(DRIFTS)研究

根据2002年春季沙尘暴细颗粒物无机组分的漫反射红外傅立叶转换光谱,确定了沙尘暴颗粒物中含有碳酸盐、硝酸盐、硫酸盐和SiO2类物质,并与透射红外光谱进行了比较．定量测定了沙尘暴期间细颗粒物中NO3^-的含量,与离子色谱结果一致,从而建立了直接测定大气颗粒物无机组分的漫反射红外傅立叶转换光谱方法。     

航空刹车用C/C复合材料断口分析

利用SEM断口形貌分析了现役航空刹车用C/C复合材料的结构和界面结合状况,探讨了其断裂机理,分析了化学气相沉积炭的沉积机理.结果表明:C/C复合材料的断裂以"弱界面断裂"为主.裂纹优先在基体炭、炭布层间或长纤维束和短纤维间的弱界面等薄弱环节处产生.当裂纹尖端扩展到基体炭中的微裂纹处时,裂纹扩展转向;当裂纹扩展到纤维时,取道纤维与基体炭间弱界面层向前扩展,纤维经历与基体炭脱粘、弯曲、拔出、断裂等过程,导致整个材料断裂.航空刹车用C/C复合材料中的CVD炭以粗糙层状结构为主,CVD过程包括碳氢气体热解、成核、炭化、沉积生长等过程,其中,成核以物理成核为主.图2,表1,参16.     

The insect antenna is not a molecular sieve

Summary The deposition rate of 2 tritiated odorants onto insect antennae of different sizes and shapes is linearly proportional to the product of odorant concentration times the antennal surface area. This result challenges an assumption in a commonly accepted hypothesis that sensillar shape affects odorant deposition and that a single odorant molecule can initiate an action potential in a receptor cell. Consequently the 1-molecule-1-spike hypothesis bears reinvestigation.     

几种低粘度固定液熔凝硅石毛细管柱的制备

氯化钠沉积粗糙化方法可以用来对熔凝硅石毛细管注的内壁进行修饰。用这种预处理的空柱可以明显提高对OV-101,OV-17,Superox-20M和OV-225几种常用的低粘度商品固定液的涂渍成功率。对制备好的几种柱子的放置稳定性进行了观察。     

幂函数模型参数的一种估计方法及其在推求西峰市暴雨公式中的应用

本文提出幂函数回归模型多数的一种估计方法，列举了它在推求西峰市暴雨公式中的应用，并与其他方法作了比较。