Survival,growth and shell deformities of copper- and cadmium-exposed mussels (Mytilus edulis L.) in brackish water

Mussels, Mytilus edulis L., were exposed to elevated concentrations of copper or cadmium in the laboratory, then placed in cages in the sea (salinity 7‰). One year later maximum lengths of the mussels were measured and shells screened for deformities. Growth was 0·6 cm year^?1 in the control cages and retarded in cages of exposed mussels. A total of 63% of cadmium-exposed and 46% of copper-exposed mussels had shell deformities. In the control cages 26% were deformed while in a natural population only 3% were deformed. The proportion of deformities to growth was inversely related. Low concentrations showed their injuriousness in this long-term test, probably due to the closing of the valves during exposure to high concentrations.     

宽频带静电反馈倾斜仪正交耦合误差分析

分析和计算宽频带静电反馈倾斜仪测量中正交方向上的倾斜对测量结果的影响。结果表明,正交方向的倾斜使测量结果产生误差,需对仪器加以改进,以减小正交耦合误差。     

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嫦娥3号巡视探测器桅杆的转动角度误差检校

嫦娥3号巡视探测器桅杆的展开机构、偏航机构和俯仰机构在转动过程中存在系统性的偏差,这些误差影响了巡视探测器导航定位、地形恢复和路径规划的精度.针对这一问题,文章提出了一种间接平差模型,通过真实数据试验证明该方法能够用于对嫦娥3号巡视探测器桅杆的转动角度误差进行检校,并且具有很高的精度和稳定性.     

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高频单历元GPS周期性误差特性分析

分析GPS高频单历元时间序列中的误差特性,采用中值滤波法消去高频噪声。经计算,偶然中误差在水平方向为±4～4.5 mm,高程方向为±9 mm。通过周期性重复解算、时间序列比对及相关系数最大化发现,GPS高频单历元时间序列中包含的周期性系统误差的重复周期为86 153～86 165 s。通过对系统误差建模或差分,可消除时间序列中的系统性成分,提高GPS高频单历元数据处理的精度。     

QOCA和GLOBK软件处理高精度GNSS网结果对比分析

分别利用GLOBK和QOCA软件对陆态网络260个基准站的GNSS观测数据进行处理,获得站点在ITRF2008框架下的坐标和速度。通过比较分析两个软件的解算结果,证明了QOCA 软件能更好地处理测站位移的非线性变化,并通过拟合周年、半年项、剔除共模误差等手段提高解算精度。结果表明,相比于GLOBK软件,QOCA软件得到的拟合残差序列的RMS在E、N、U 3个方向上分别减小70%、80%和70%。     

阿尔金断裂带中段现今构造形变模式的InSAR研究

利用2007～2010年间14景ALOS PALSAR数据及SBAS InSAR技术,获取阿尔金断裂带中段91°E附近现今地壳形变速率场,并反演该地区断层的滑动速率和闭锁深度。结果表明,阿尔金断裂中段地区的形变速率自北向南呈3个线性梯度变化区,分别为阿尔金山东段8～12 mm/a、索尔库里盆地6～7 mm/a、阿尔金断裂带以南约0 mm/a。3个速率梯度变化区主要集中在喀腊达坂断裂和阿尔金主断裂上;拟合的断层就位于金雁山南缘、喀腊达坂断裂南邻,走滑速率从西（7.1 mm/a）向东（14.0 mm/a）逐渐增大,闭锁深度自西(4.5 km)向东(10.6 km)逐渐趋深。结合前人研究推测,金雁山（阿尔金山链东部）与索尔库里拉分盆地组成的复合破裂构造模式,是转换断层运动时应力和应变调整的主要驱动机制。     

厦门东孚井水氡异常研究

根据厦门东孚井水氡多年的观测资料,分析了水氡异常与地震活动的关系。分析结果认为,该井点映震效果较好,特别是对发生在长乐-诏安断裂带上的地震,映震能力尤为明显。     

STUDIES ON CULTURE CONDITIONS OF BENTHIC DIATOMS FOR FEEDING ABALONE Ⅲ. EFFECTS OF IRON AND SILICON NUTRIENTS AND OF ORTHOGONAL COMBINATIONS OF NITROGEN,PHOSPHORUS,IRON AND SILICON ON GROWTH RATE

rmDUCnONInthecultUreofbenthicdiatomsasfeedforabalone,itisnecesoptoaddsomnu-trientssuchasnitIngen,Phosphorus,ironandsilicontotheSeawatermwhum.Thecom-monraioofthenutrientswas(lO-25):(l-2.5):o.l:l(mg/L)(Chenetal.,1977).Anstinetal-(l99o)rePOrtedthatheratioofnibogenandphosphorusinfluencedthebio-massdensityofthePeriphyton,whichInainlyconsistedOfbenthicdiatomPOPulations.However,theirrestiltswerenotbasedonmonoalgalwwh,andtherewerenodetallsonthereasonableratioofthesenutrientsintheirreports-Ther…