基于VB平台的水准网平差软件开发研究

基于Visual Basic 6.0平台,研发了水准网平差软件,并介绍了软件所实现的主要功能及特点,验证了软件计算结果的正确性和稳定性。     

基于RS与GIS的三峡库区(重庆段)人居环境适宜性评价

To explore geographical differences in quantitative characteristics and spatial pat-tern of human settlements environmental suitability (HSES) in the Three Gorges Reservoir Area (TGRA),terrain,climate,hydrology,vegetation and other natural factors were selected to build the livable environmental evaluation,and the quantitative analysis was conducted through Remote Sensing(RS) and Geographic Informational System (GIS) to reveal geo-graphical characteristics and spatial patterns of HSES.The results are obtained as follows:(1) inhabitants of the TGRA of Chongqing are concentrated in the area with moderate high HSES,which is 78% of the total population distributed in 48% of the study area;(2) the HSES is closely related to the terrain,and it forms an arc-banded spatial succession pattern:relatively low in the northeast and the southeast while comparatively high in the west and the south;(3) large numbers of people are distributed in the area with low suitability (with higher population density than the average of the western China),but economic development level in these areas is quite low.Moreover,these areas are ecological sensitive and fragile,many kinds of eco-environmental problems have been caused by human activities.Therefore,population migration and layout are reasonable options for the development of these areas.     

Preparation of polysaccharides in different molecular weights from Ulva pertusa Kjellm （Chorophyta）

As molecular weight controls the biological activities of polysaccharides, screening the optimal molecular weight of polysaccharides is important in drug research and application. In this study, hydrogen peroxide was employed as oxidant, and temperature, reaction time, and concentration of polysaccharides and hydrogen peroxide were examined for their effects on the preparation of polysaccharides in different molecular weights from Ulva pertusa. Our experiment suggested that the optimal degradation concentrations for polysaccharides and hydrogen peroxide were 2.5% (w/v) and 8.0% (v/v), respectively. The range of degradation measured by relative viscosity was mainly controlled by temperature and time. Results revealed that 35℃ was the optimal temperature for obtaining low-degradation samples, and 50℃ was the most favorable temperature to accelerate the reaction to yield highly-degraded samples. Four samples in different molecular weights A, B, C and D were finally prepared. The controllability was evaluated by the relative standard deviation (RSD) of relative viscosity, and the peak molecular weights and the polydispersity indexes (Mw/Mn) of molecular weights were measured by high performance gel permeation chromatography (HPGPC).     

一次重庆特大暴雨过程的中尺度分析

利用NCEP格点再分析资料、地面实况资料、TBB资料以及雷达资料对2011年7月6 7日重庆大暴雨过程进行了分析研究。结果表明,此次暴雨过程中切变线附近发展起来的中尺度对流系统是暴雨产生的直接原因,且从动力、热力、水汽条件以及能量等方面分析表明重庆东北部已具备暴雨发生的有利条件。通过雷达产品的分析可知,两个阶段降水的中尺度特征不同:第一阶段降水,径向速度场上出现逆风区,对应逆风区的回波较强,雨强较大,且垂直风廓线VWP显示高空有偏西偏南的强风速带下传,从而形成较深厚的西南气流风场;第二阶段降水,径向速度场上出现强度不对称的"牛眼"结构,存在风速辐合,同时VWP显示中低层有深厚的冷空气楔入,使暖湿空气抬升,降水在经过短暂的减弱后再次加强。     

The preparation of low electroendosmosis agarose and its physico-chemical property

Studies on Gelidium amansii agar fractionations were carried out in this paper. Gelidium amansii agar was fractionated on DEAE-Cellulose, and four fractions were obtained sequentially. The fractions were analyzed on physical and chemical properties, and IR and 13C-NMR spectroscopy applied for elucidating the chemical structure. Among the four fractions obtained, water fraction measured up to the standard of low EEO agarose. The sulfate content, ash content, electroendosmosis and gel strength (1%) of water fraction were 0.16%, 0.34%, 0.12 and 1 130g/cm2 respectively, similar to those of the Sigma products.     

华云CAWS600系列区域气象站的维护

文章叙述了华云CAWS600系列区域气象站及其中心站在运行过程中出现的故障现象,以实例的方式枚举符种故障发生,总结出故障的诊断和排除方法。     

航空重力测量内符合精度计算方法

为了评估航空重力系统的性能指标,通常采用对一条测试线多次往返飞行计算各条重复测试线内符合精度的方法。笔者研究了一种较准确的计算各重复线对应点的方法,并在对应点处采用插值方法计算其重力值,利用重复线上对应点的重力值进行均方差计算可以得到精度较高的内符合精度值。     

广东省交通优势度及空间差异

以广东省为研究对象,构建多维指标体系,从路网密度、交通设施影响度、交通枢纽辐射水平三方面分别对各县区的差异进行分析,并综合分析其交通优势度.研究表明,广东省交通优势度呈明显的圈层分布,从中心向外围递减,从沿海向内部递减;珠三角交通优势度在全省具有明显优势,其路网密度、交通设施影响度、交通枢纽辐射水平均为全省第一层次;广东省交通优势度还与地区经济发展水平有密切关系,通过对交通优势度和人均国民生产总值进行回归分析,发现交通优势度与经济发展水平呈明显的正相关.     

接收低分辨拼接图的新方法

自气象卫星问世以来,卫星云图以形象直观,探测范围大,出图速度快等优点,在天气分析和预报中发挥了重要的作用,并越来越受到气象人员的重视和欢迎。就目前我国多数气象台站而言,主要接收日本GMS系列卫星-云图。GMS卫星播发的云图有高,低分辨率两大类。受条件限制,多数台站主要接收低分辨的局部区域云图和由A—D组成的拼接图。     

国外海水温度的接收与应用

海水温度是海水的基本物理特性之一,它体现了海水运动的热量输送和海气热量交换。而海水表层温度SST则体现了海面热量平衡的结果。从渔业生产的角度上看,水温是决定鱼类新陈代谢、生长速度、性腺成熟度、活动区域以及摄食量的重要因素。因此,近年来世界主要海洋国家对海水温度的分析和研究引起高度重视。日本和美国在利用气象卫星研究海水温度方面先行于其他国家,已进入实用阶段。以下介绍的海水温度(传真)图,大多数是他