利用C波段RADARSAT-2单极化SAR图像的方位向截断波长估计有效波高

This paper proposes two simple models, look-up table(LUT) model and empirical model, to directly retrieve significant wave height(Hs) using synthetic aperture radar(SAR) azimuth cutoff(λc). Both models aim at C-band VV, HH, VH, and HV single-polarization SAR images. The LUT model relates Hs to λc, while the empirical model relates Hs to both λc and SAR range-to-velocity(β). The LUT model coefficients are derived by simulation under different sea states and observation conditions, which depend on incidence angle(θ), wave direction(dw), and βbut are independent of polarization. The empirical model coefficients are obtained by fitting the collocated data,which only depend on polarization. To fit empirical model coefficients and validate the two models, C-band RADARSAT-2 fine quad-polarization(VV+HH+VH+HV) single-look complex(SLC) SAR images and collocated buoy data are collected. Retrieved Hs, using Yang model and the two models proposed in this paper from four kinds of polarization SAR data, are compared with buoy Hs. Results show that both LUT and empirical models have the capacity of retrieving Hs from C-band RADARSAT-2 co-polarization SAR data, while Yang model is not suitable for these kinds of SAR data. Moreover, the empirical model is also valid for cross-polarization SAR data showing clear ocean wave stripes.     

根据光的衍射测量头发的直径

本文利用光的波动性，对不透明的线性物体进行衍射，证实与单缝衍射花纹相同，并测出激光器波长，进而又测出易变形的细微物体一头发丝地上径。本实验仪器简单，成本低廉，可为一般大学增添一个光实实验，使学生对光的波动性有进一步认识，以实验过程的设计、仪器安装理论和误差分析也是一次很好的训练。     

双波长分光光度法同时测定微量铜,钴的研究

本文研究用２－（５－溴－吡啶偶氮）－５－二乙氨基酚（５－Ｂｒ－ＰＡＤＡＰ）作显色剂双波长分光光度法同时测定微量铜和钴的反应条件。在ｐＨ５．０－６．０酸度范围内选择测定铜的波长对为５４５／１５６８ｎｍ；测定钻的波长对为５８５／４９５ｎｍ。于５０ｍｌ溶液中，铜、钴含量分别在０－０．５６ｕｇ／ｍｌ和０－０。４８ｕｇ／ｍｌ内符合比尔定律。方法用于岩石矿物样品的测定效果良好。     

A New Catalogue of Fine Structures Superimposed on Solar Microwave Bursts

The 2.6-3.8 GHz, 4.5-7.5 GHz, 5.2-7.6 GHz and 0.7-1.5 GHz component spectrometers of Solar Broadband Radio Spectrometer (SBRS) started routine observations, respectively, in late August 1996, August 1999, August 1999, and June 2000. They just managed to catch the coming 23rd solar active maximum. Consequently, a large amount of microwave burst data with high temporal and high spectral resolution and high sensitivity were obtained. A variety of fine structures (FS) superimposed on microwave bursts have been found. Some of them are known, such as microwave type Ⅲ bursts, microwave spike emission, but these were observed with more detail; some are new. Reported for the first time here are microwave type U bursts with similar spectral morphology to those in decimetric and metric wavelengths, and with outstanding characteristics such as very short durations (tens to hundreds ms), narrow bandwidths, higher frequency drift rates and higher degrees of polarization. Type N and type M bursts were also observed. Detailed zebra pattern and fiber bursts at the high frequency were found. Drifting pulsation structure (DPS) phenomena closely associated with CME are considered to manifest the initial phase of the CME, and quasi-periodic pulsation with periods of tens ms have been recorded. Microwave “patches”, unlike those reported previously, were observed with very short durations (about 300ms), very high flux densities (up to 1000 sfu), very high polarization (about 100% RCP), extremely narrow bandwidths (about 5%), and very high spectral indexes. These cannot be interpreted with the gyrosynchrotron process. A superfine structure in the form of microwave FS (ZPS,type U), consisting of microwave millisecond spike emission (MMS), was also found.     

双波长卫星激光测距资料处理方法的研究

为使双波长卫星激光测距的观测数据能用于大气改正的研究，本文对观测数据采用测距差分的平均和平均距离的差分两种方法来提高精度，并和Marini-Murray大气改正模型比较。在现有精度下，没有发现明显的差别。随着双波长卫星激光测距精度的提高，应用本文使用的差分方法，能提高双波长的观测资料归算精度，以用于对大气改正的研究。     

多参数雷达在气象观测中的应用

根据双偏振（水平/垂直线性偏振）、双波长（S波段和X波段）、多普勒天气雷达分别在美国佛罗里达州中部亚热带地区和科罗拉多高原的观测数据时间序列,对在两个不同地理环境、不同天气情况下雷达参数的气象特征及其统计特性进行了分析和比较,为我国开发研制双偏振多普勒天气雷达及其气象应用提供了有意义的参考数据和资料。     

利用球冠谐分析方法提取不同波长重力场异常

介绍球冠谐分析方法在重力场研究中的基本理论和计算方法。探讨了球冠谐系数与波长的关系，以及利用球冠谐分析方法提取不同波长的重量场力场异常，进而研究深部地壳结构的问题，最后给出一个实例。     

偶氮氯膦Ⅲ双波长分光光度法同时测定铀矿石中钍和铀

本文对偶氮氯膦Ⅲ与钍、铀的显色反应作了研究,提出了三烷基氧膦-G.D.X-301萃取色层分离、偶氮氯膦Ⅲ双波长分光光度法同时测定铀矿石中钍和铀的方法。方法简便,精密度、准确度良好。     

双波长分光光度法测定微量银的研究

本文用双波长分光光度法研究了Ag-5-Br-PADAP-柠檬酸-十二烷基硫酸钠多元显示体系。实验表明,该体系的显色适宜酸度为pH5.5,测量波长为532nm,参比波长为356nm。表观摩尔吸光系数为1.26×10~5l·mol~(-1)·cm~(-1),灵敏度比单波长提高近两倍。银量在0～20μg/25ml内符合比耳定律。方法简便快速,灵敏度高,适用于地质样品中微量银的测定。