球状星团M79的自行测定和轨道运动

利用上海天文台相隔29年的两期天体测量底片，测量了球状星团M79的绝对自行，采用Harris给出的这个星团离开太阳的距离和视向速度数据，计算了星团当前的空间运动速度；根据银河系引力势模型，进一步计算了该星团在银河系中的轨道参数，还对利用自行数据所作的球状星团运动学研究的不确定性作了讨论。     

上海GPS综合应用网对2002年长江三角洲地区入梅过程的监测

简要介绍了上海GPS综合应用网(SCGAN)情况，分析了该网从2002年6月投入正常运行后，获取的2002年入梅前后长江三角洲地区高分辨率可降水量(PWV)资料，描述了PWV所反映的长江三角洲地区的入梅过程和特点，以及把GPS／PWV同化到中尺度数值预报模式初始场中的试验。     

我国洞体应变固体潮调和分析结果

本文扼要介绍了我国洞体应变观测现状,公布了18个台站的调和分析结果,同时公布了国外同类仪器优质台站的计算结果,以作比较。     

胶东地区区域岩石物性参数的地质应用

不同区域岩石类型标本测定的物性参数,除作基础资料供区域地质及区域地球物理研究使用外,还可以结合地质资料解决某些地质问题。文中利用胶东东部188件样品和胶东西部80件样品的5种物性参数:K(磁化率), Jr(剩磁),σ(密度),ρ(电阻率),η(极化率),采用判别分析方法,解决胶东东部和西部岩体划分对比问题,并依据物性参数进行聚类分析,划分不同母体。     

肥城市采煤塌陷地治理利用情况

1基本做法 肥城市地处山东中部，是山东省重要的煤炭基地，自1958年建矿以来，先后有13座煤矿建成投产。地下煤炭资源的开采，造成大面积土地塌陷，严重破坏了矿区的地形地貌。塌陷涉及肥城市4个镇71个行政村，总面积5000hm^2。由于地面塌陷，交通、水利、农业基础设施遭到严重破坏，大面积的粮田成为沼泽水域，杂草丛生，荆棘遍地，生态环境恶化，人民的正常生产和生活受到重大影响。     

布袋注浆桩在深厚层软土地基加固中的应用

布袋注浆桩是一项新的软土地基加固技术,应用于深厚层和夹硬层的软土加固,具有明显的优势。结合甬台温铁路深厚层软土地基加固,介绍了布袋注浆桩的加固机理、设计、施工、质量检测方法和标准等。检测结果表明,布袋注浆桩成桩质量良好,加固后,地基沉降得到有效控制,满足设计要求。     

北京大学AMS 14 C 国际比对样品测量*

介绍了北京大学加速器质谱(AMS)实验室参加国际原子能机构 (IAEA) 组织的第五届¹⁴ C国际比对样品测量的过程和结果,包括样品制备、小型¹⁴ C测量加速器质谱计装置和比对测量结果的统计分析等。北京大学的测量结果与IAEA加权统计平均值的偏差在1σ之内, 这一结果较客观地体现了我国¹⁴ C AMS年代测定在国际同类实验室中所处的地位。     

Cosmogenic Be inferred lake-level changes in Sumxi Co basin, Western Tibet

Most Tibetan lakes are surrounded by conspicuous regressive shorelines attesting to high-water levels in the past. Concentrations of the in situ produced cosmogenic radionuclide ¹⁰Be in bedrock from the three highest terraces surrounding Sumxi Co, situated in Western Kunlun, indicate that the highest lake-level appeared before 10,000–11,500 yr, and most likely between 11,000 and 12,800 yr. Younger ages for the two lower terraces imply regression of Sumxi Co during the early-mid Holocene. The concurrency of the highest lake-level with orbitally induced maximum northern hemisphere summer insolation suggests that the increase in water supply to Sumxi Co was most likely associated with increased recharge from melting glaciers. We conclude that the enhanced Indian monsoon during the early Holocene did not penetrate the Tibetan plateau and affect the northwestern part of Tibet significantly.     

Single epoch ambiguity resolution for Galileo with the CAR and LAMBDA methods

This paper investigates single epoch ambiguity resolution performance using Galileo four frequency data. Two commonly used ambiguity resolution methods are used in the tests, including the Cascade Ambiguity Resolution (CAR) and the Least-Squares Ambiguity Decorrelation Adjustment (LAMBDA) methods. For CAR method, four optimal combinations are carefully selected according to their wavelength to noise ratios and success rate for ambiguity fixing. The test results show, in general, the LAMBDA method performs better than the CAR method. The speed of ambiguity resolution is closely related to the carrier phase measurement precision. With carrier phase measurement precision of 3 mm, single epoch ambiguity resolution can be achieved at every epoch with simulated 1-s interval 24-h Galileo data (total epochs 86,400). With the increase of carrier phase noise, ambiguity resolution performances become worse. When the noise level is increased to 12 mm, single epoch ambiguity resolution can only be achieved about 50% of epochs.     

India-Eurasian collision vs. ocean-continent collision＊

Introduction Major tectonic activities occur in collisions zones between plates or intra-plate continental blocks. Therefore, it is significant to investigate collision processes. We know that orogenic and seismic belts in plate margins are closely relate…