一种改进的恒星相机在轨检校方法

目前利用星对角距进行恒星相机在轨检校时,一般有两种方法,一种是不考虑镜头畸变,只检校相机内方位元素;另一种考虑畸变的影响,先检校相机内方位元素,再用多项式来拟合畸变。本文在利用镜头畸变规律的基础上,将畸变与相机内方位元素一并检校。实验表明,该方法比其他两种方法能更有效的提高相机检校精度。     

土地勘测定界系统的设计与应用

介绍了土地勘测定界系统的功能设计,阐述了成果制作过程,实现了与建设用地报批、土地变更、土地市场交易等的无缝衔接。     

关于国家15∶0000地形数据库更新地名拼音录入的讨论

在国家1∶50000地形数据库更新工程中,应用软件提供了汉字转拼音的工具,但转换效果很难满足设计要求。本文通过对软件交换文件和项目设计的分析,利用程序实现新增地名与变更地名的拼音字段自动填写,并应用于安徽实验图中,取得了较满意的转换效果,同提高了作业效率和作业质量。     

台风气压场与风场研究进展

回顾了台风气压场、风场研究的发展过程.从台风气压场与风场的理论研究、台风的不对称性结构、最大风速与变分调整方法、台风气压场与风场的数值模拟和台风作用下水汽热交换等方面的研究进展进行了综合分析与述评,并根据学科发展趋势和工程实际的需要,指出今后在台风气压场与风场的研究中应着重解决的问题和发展趋势.     

Primary production in the Strait of Gibraltar: Carbon fixation rates in relation to hydrodynamic and phytoplankton dynamics

Primary production was studied at nine sites distributed within the Strait of Gibraltar (Southern Spain) and North-Western (NW) Alboran Sea by analyzing photosynthesis-irradiance (P–I) relationships and integrated primary production rates in relation to the different types of Deep Chlorophyll Maxima (DCM) detected in the area. The characteristics of the DCM were examined by several methods, including flow cytometry, quantification of transparent expolymer particles and fluorimetric measurements that were applied in order to assess the photo-physiological state of the phytoplankton assemblages with respect to their species composition and water column structure (hydrology). The photosynthetic parameters (derived from P–I relationships) and integrated primary production (range 6–644 mg m⁻² d⁻¹) responded greatly to the diverse DCM identified and thereby the spatial variability of the primary production observed in the region was found to depend upon the occurrence of the different types of phytoplankton accumulations, which were themselves indicative of the previous history of the water column. The net contribution of the primary production to the air–sea CO₂ exchange process was also evaluated in the area. Results indicated that this region behaved as a net sink for the atmospheric CO₂, with the intensity of the flux being strongly modulated by the wind intensity.     

渤海湾潮间带湿地物质交换功能的历史比较

在对渤海湾潮间带典型湿地进行动态分析的基础上,运用水文地貌和植物学原理,筛选出水文条件、表面糙率和植被结构三个指标,建立了潮间带湿地物质交换功能评价模型,并选择了3个典型时期,对渤海湾天津段潮间带湿地的物质交换功能作了比较。评价结果表明:以1954年为基准年,经过近50年来的发展变化,渤海湾潮间带湿地物质交换功能几乎消失。在滩涂上修建的海防公路使得滩涂上原有的植物消失,导致植被结构指标变成0,是其功能退化的主要原因。运用本模型可以综合反映一定区域的海岸带湿地生境的退化程度。     

Long term sea level change and water mass balance in the South China Sea

Sea level anomalies observed by altimeter during the 1993–2006 period, thermosteric sea level anomalies estimated by using subsurface temperature data produced by Ishii and SODA reanalysis data, tide gauge records and HOAPS freshwater flux data were analyzed to investigate the long term sea level change and the water mass balance in the South China Sea. The altimeter-observed sea level showed a rising rate of (3.5±0.9) mm yr-1 during the period 1993–2006, but this figure was considered to have been highly d...     

Value estimation of greenhouse gases exchange in wetland ecosystem of Sanjiang Plain, China

The objective of this study is to quantify the values of greenhouse gases (GHGs) exchange in carbon equivalents of marshes and paddy fields in the Sanjiang Plain, Heilongjiang Province, China. We obtained the GHGs exchange values based on comparable price by calculating the carbon sequestration values and the GHGs emission values of marshes and paddy fields respectively in four periods of 1982, 1995, 2000 and 2005. It is noted that the GHGs emission values are always negative. In this study, the marshes areas decreased from 1438977.0 to 775,132.2ha and the paddy fields areas increased from 417195.8 to 934205.0ha. The values of GHGs exchange of marshes varied from 135877.156×106 to 136882.534×106 yuan (RMB) and those of paddy fields varied from 1006.256×106 to 2767.645×106 yuan. The GHGs exchange values of marshes decreased from 1982 to 2005 on the whole, reversely, those of paddy fields increased, but those in 2005 were lower than those in 2000. In different periods, the GHGs exchange values were always higher in marshes than in paddy fields. The contribution rate of GHGs exchange values per unit area of marshes was also very high in different periods, and the maximum was up to 98.35% in 2005. As far as the whole wetland ecosystem (including marshes and paddy fields), assuming a linear change in GHGs exchange values, it represented a cumulative increase of 20926.757×106 yuan from 1982 to 2005. By adding GHGs exchange values increased during those four periods, we obtained a cumulative net increase values of GHGs exchange of wetland ecosystem of 18200.860×106 yuan. The results will be useful for understanding the indirect services provided by marshes and paddy fields.     

中华鲟卵黄脂磷蛋白的分离纯化及性质分析

采用Sephacryl S-300凝胶过滤和DEAE Fast Flow阴离子交换两种层析法分离纯化中华鲟(Acipenser sinensis)卵黄脂磷蛋白(lipovitellin,Lv),对每个峰进行SDS-PAGE电泳及油红O、甲基绿和Schiff试剂特异染色,峰Ⅱ蛋白均呈阳性,表明峰Ⅱ蛋白为中华鲟卵中的一种卵黄脂磷蛋白,SDS-PAGE电泳分析表明其由一种分子质量为43.5 ku的亚基构成。对中华鲟Lv氨基酸组成进行研究,证明其是一种含有相对较多天冬氨酸、谷氨酸、缬氨酸和亮氨酸的蛋白。     

长岛连岛坝两侧海域海水水质比较研究

长期以来,连接南北长山岛的大坝一直被视为导致其西侧庙岛塘海域水质恶化的重要原因,但这种推断并没有得到证实。通过分析2007年9月和11月2次海水水质调查数据,比较了连岛坝两侧海域的水质环境。对比分析结果表明,连岛坝西侧半封闭海域海水质量较东侧开放海域略差,但不同类的水质因子表现完全不同。研究认为,拆除南北长山岛间的连岛坝,促进连岛坝两侧海水交换,可降低西侧海域的部分海水水质因子的浓度,从而对改善其水质环境起到一定的作用。但单纯从水质的角度看,这种作用是有限的。