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用超长基线解算分析汶川地震动态形变特征

以远距离的IGS武汉GPS站为参考站,用超长基线双差瞬时精密定位技术,获取汶川Ms8.0地震震时震区连续GPS站1 Hz动态形变序列。同时以较近距离的雅安站为参考站解算动态形变序列,结果显示,两者的形变结果具有很好的一致性。距离断层较近的郫县、成都、绵阳、中江等站形变较大（形变最大的郫县站最大振幅达1.034 m）;位于震中南侧的邛崃、雅安等站形变较小。利用动态时序的地震波到时和震中距离估计地震波地壳平均速度为3.1 km/s。     

不同食物与放养水层对九孔鲍生长的影响

采用室内池子多层笼养殖方式 ,以加工海带、鲜江艹离 与 A,B2种片状饲料为饵料 ,试验了不同食物与不同放养水层对九孔鲍生长影响 ,结果表明 :( 1)从壳长增长上 ,海带与饲料 B近似 ,各为 11.3与 11.2 mm;其次为饲料 A,10 .2 mm;而江 艹离 最差 ,仅 7.7mm;( 2 )在体重增长上 ,以饲料 B最高 ,平均每只为 3.3g,其次为饲料 A与海带 ,平均每只 2 .9g,而江艹离 仅 1.8g;( 3)从试验期间所获体重增长比壳长增长看 ,两种饲料 ( B为 2 95,A为 2 84 mg/mm)均比两种海藻高 (海带为 2 57,江艹离 为 2 34mg/mm) ;( 4 )从垂直 11层笼子九孔鲍生长的比较 ,下层的好于上层 ,越是下层越好 ,投喂两种饲料在体重上差别更明显。     

江苏地质资料汇交管理中存在的问题与对策建议

地质档案资料是地质工作成果的体现.按规定汇交,实施统一管理符合<矿产资源法>的要求.从原地矿部颁布实施的<全国地质资料汇交管理办法>到汇交意识、管理难度以及市场经济条件下的汇交计划管理模式等方面,论述了目前在资料汇交工作中存在的主要问题.建议加快地质资料管理法规建设,加大执法力度 ,采取优质服务,树立地质资料汇交行政管理部门的权威和良好形象.     

对江苏有色金属矿山发展的探讨

针对调研了解的江苏省有色金属矿山企业的基本情况及面临的可供开采资源不足、负债率过高、转产安置难、负担重等主要困难和问题, 在考虑矿山企业特殊性的基础上,对其改革和发展提出了加强矿产勘查、制定和完善产业政策和经济政策、加快改革和调整、加快剥离办社会职能等4个方面的建议.     

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基于改进Kriging插值模型的城市地面沉降变形趋势面模拟

从建筑物荷载引发地面沉降的机理模型出发,综合考虑建筑物产生的附加应力以及地基土壤压缩性质对沉降量的影响,构建了改进克里金插值模型。通过实际应用证明,使用改进克里金插值模型进行城市地面沉降空间趋势面模拟和计算,能够准确清晰地反映沉降变形的大小和趋势,从而为地面沉降的空间建模与可视化分析、总结建筑物荷载作用下城市地面沉降的变形规律奠定基础。     

Effect of compressive strength on the performance of the NEMO-LIM model in Arctic Sea ice simulation

Satellite records show that the extent and thickness of sea ice in the Arctic Ocean have significantly decreased since the early 1970s. The prediction of sea ice is highly important, but accurate simulation of sea ice variations remains highly challenging. For improving model performance, sensitivity experiments were conducted using the coupled ocean and sea ice model (NEMO-LIM), and the simulation results were compared against satellite observations. Moreover, the contribution ratios of dynamic and thermodynamic processes to sea ice variations were analyzed. The results show that the performance of the model in reconstructing the spatial distribution of Arctic sea ice is highly sensitive to ice strength decay constant (C^rhg). By reducing the C^rhg constant, the sea ice compressive strength increases, leading to improved simulated sea ice states. The contribution of thermodynamic processes to sea ice melting was reduced due to less deformation and fracture of sea ice with increased compressive strength. Meanwhile, dynamic processes constrained more sea ice to the central Arctic Ocean and contributed to the increases in ice concentration, reducing the simulation bias in the central Arctic Ocean in summer. The root mean square error (RMSE) between modeled and the CryoSat-2/SMOS satellite observed ice thickness was reduced in the compressive strength-enhanced model solution. The ice thickness, especially of multiyear thick ice, was also reduced and matched with the satellite observation better in the freezing season. These provide an essential foundation on exploring the response of the marine ecosystem and biogeochemical cycling to sea ice changes.

     

Universal birefringent filter with a new double passband mode

This article describes the universal birefringent filter (UBF) which will be mounted at Taiwan. The UBF permits observations of solar images, vector magnetic fields and/or line-of-sight velocity fields in any Fraunhofer line in the wavelength region from 4000 to 7000 with half width from 0.05 to 0.14 . We have tested it at ten Fraunhofer lines under a spectral telescope in Huairou Station of Beijing Astronomical Observatory and obtained the passband profiles. The principles of magnetic field and velocity field measurement with the UBF are also described.     

基于ROACH的微波全息法相关机设计

基于ROACH开发平台设计了一套适用于微波全息法测量的高性能实时数字相关机,采用了带通采样技术,无需在相关机之前进行基带转换,使全息测量硬件系统更加简洁;采样速率为10 Mbps~1 000 Mbps可调,采用数字混频、数字滤波,信号带宽和频率分辨率都易于调整,具有很大的灵活性和可扩展性。测试结果表明该相关机测量精度高、稳定性好、准确可靠。