自然与农田状态下照度计测光的偏差分析

根据色度基本原理，推导并计算了不同天气类型下照度的换算因数，并在不同天气类型下，对自然光和小麦群体不同高度透光情况进行了测定，将照度计实测照度换算出的辐射强度与实测辐射强度进行对比。结果表明：①前两种照度计可以在1、2级日光状况下用于太阳辐射测定而在3、4级日光状况下误差较大。②在作物田中，实测照度换算为辐射光量子数时，内活动面偏差比在0.2左右，而外活动面因光斑阴影作用，偏差较大，实测时应增加重复。     

A comparison of three image-object methods for the multiscale analysis of landscape structure

Within the conceptual framework of Complex Systems, we discuss the importance and challenges in extracting and linking multiscale objects from high-resolution remote sensing imagery to improve the monitoring, modeling and management of complex landscapes. In particular, we emphasize that remote sensing data are a particular case of the modifiable areal unit problem (MAUP) and describe how image-objects provide a way to reduce this problem. We then hypothesize that multiscale analysis should be guided by the intrinsic scale of the dominant landscape objects composing a scene and describe three different multiscale image-processing techniques with the potential to achieve this. Each of these techniques, i.e., Fractal Net Evolution Approach (FNEA), Linear Scale-Space and Blob-Feature Detection (SS), and Multiscale Object-Specific Analysis (MOSA), facilitates the multiscale pattern analysis, exploration and hierarchical linking of image-objects based on methods that derive spatially explicit multiscale contextual information from a single resolution of remote sensing imagery. We then outline the weaknesses and strengths of each technique and provide strategies for their improvement.     

精化区域大地水准面若干问题的探讨

对精化区域大地水准面的一些问题进行了探讨 ,以便有关单位在精化区域大地水准面时进行参考。     

多时相Radarsat数据在广东肇庆地区稻田分类中的应用

将1996年获取的4个时相的Radarsat图像用于广东肇庆地区的稻田分类试验,结果表明,多时相Radarsat数据对水稻类型的识别精度较高,而且稻田的轮作规律容易推测出来。本文系统地介绍了这一试验研究的最新进展,探讨了神经网络分类方法在SAR图像处理中的应用潜力和Radarsat数据在中国南方水稻监测中的最佳时相选择和有效分辨率问题。     

Seismic moment tensor representations and radiation patterns in unbounded media with elipsoidal cavities driven by low frequency pressure

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数值模式中长波辐射参数化方案的对比试验

应用一个简化的长波辐射参数方案，与郭晓岚－钱永甫模式原有长波辐射参数化方案进行了对比，分析了它们对１００ｈＰａ，３００ｈＰａ，５００ｈＰａ，７００ｈＰａ及地面的高度场、温度场、流场及气压场模拟结果的影响，发现不仅两者结果相当一致，而且与实测结果也符合很好。     

冰云短波辐射特性参数化

该文对卷云和高层云分别构造了15种冰晶尺度分布，3种云高和云厚，总共30种冰水含量、90种冰水程长模式。对尺度小于与大于30 μm的冰晶粒子的单次散射特性分别用表面积等效冰球Mie理论和射线光学理论进行计算。采用delta-Eddington法计算了在4种不同地面反射率下冰云的多重散射辐射传输特性，提出了冰云辐射特性的参数化公式，指出参数化公式可以用于气候模式或大气环流模式。     

新疆月太阳总辐射气候学计算方法的研究

本文先对现有各种太阳总辐射气候学计算公式进行讨论，并确定Ｑ＝Ｑ２为新疆最佳计算公式，然后根据新疆９个月日射站的资料分南疆，北疆两大区域按月给出区域统一式，最后验证了它们的计算效果。     

Ecophysiology of the saguaro cactus (Carnegiea gigantea) in the Saguaro National Monument: relationship to symptoms of decline

The purpose of this study was to examine physiological correlates to the phenomenon of epidermal browning and saguaro decline in Saguaro National Monument. Gas exchange characteristics, surface temperatures, and the extent of epidermal browning in tissues of both healthy and declining saguaro cacti (Carnegiea gigantea) at different solar orientations were examined in eight long-term monitoring plots in the Rincon Mountain District of the Saguaro National Monument near Tucson, Arizona during both wet and dry seasons and years.Daily maximum surface temperatures were greatest on west-oriented tissues, as predicted by a simple model. However, south- and south-west-oriented tissues showed the highest browning indices, suggesting that browning may be more related to cumulative thermal loading than to extreme late afternoon temperature events. During the wet season, maximum nocturnal CO₂uptake rates and total nocturnal CO₂uptake were negatively correlated with browning index. Uptake rates during dry seasons and dry years was minimal, and not related to browning indices. However, healthy tissues of saguaros that also had tissues with high browning indices had wet-season maximum CO₂uptake rates as high as saguaros without damaged tissues, suggesting that the browning is not systemic but rather is tissue- and angle-specific. Instantaneous measures of water-use efficiency did not vary significantly or predictably by angle, but rather were greatest during night-time and in tissues when CO₂uptake was greatest. We suggest that browning symptoms on cacti are most likely due to natural abiotic stress, and are unrelated to systemic pollution stress or increased UV-B radiation.     

变频激电法在四川某金矿中的应用

本文介绍了用变频激电法寻找含金硫化物矿体 ,通过对视幅频效应 Fs,和交流视电阻率 ρsf的分析 ,取得了良好的地质效果