地幔流体研究进展

介绍了在地幔流体的成分、源区、形成机制、运移方式和分异模式以及地幔流体与地幔交代作用、岩浆作用和成矿作用的关系等方面研究的一些新进展 ,总结了地幔流体的研究途径和方法的一些新突破 ,并指出了今后的重点研究方向。     

稀土在热压人造金刚石工具中的应用研究

稀土有其独特的物理化学性能 ,能有效地提高硬质合金的综合性能。将稀土在硬质合金中的应用成果借鉴到金刚石工具研制中 ,并对其关键的掺杂工艺进行改进 ,取得了成功。对于以 Fe代 Co和提高金刚石工具的性能起到了明显的作用。     

青田山口叶蜡石传压介质初步研究

采用青田山口叶蜡石作为超高压高温合成金刚石的传压介质，分析了其主要化学成分和矿物组成。对青田山叶蜡石粉压块粒度效应进行了研究，确定了该传压介质的粒度组成。超高压高温人造金刚石试验表明，青田山口叶蜡石的传压介质理想，金刚石合成效果较好。     

Step-frequency radar applied on thin road layers

In the field of road construction and maintenance, the need for information on the thickness of very thin road layers is not satisfied by means of commercial pulse GPR, due to the inability of such devices to operate over ranges of several gigahertz. As a result, research has focused on the design of a step-frequency radar technique, able to work with very high-frequency synthetic pulses.An ultrawide band antenna, belonging to the family of Vivaldi antennas, has been developed for road applications. It has been created using stripline technology and yields a band width greater than one decade. During an initial step, this antenna was tested on various bituminous concrete samples with a network analyzer. Different parameters were studied, including band width, offset between antennas, and height and shape of the frequency-dependent pulse.A second step involved GPR dynamic measurements. A customized software program enabled recording data from the network analyzer. Several radar profiles were developed from selected road construction and maintenance test sites (e.g. the Circular Pavement Fatigue Test Track, composed of a number of known structures). Results show improved resolution when compared to a commercial impulse GPR system.     

金刚石界面金属碳化物过渡层强度的研究 (金刚石焊接机理研究之二)

通过对试样进行强度测试后，在高倍电镜和能谱仪上对金刚石界面金属面碳化物的微观结构和含量的观察，分析，测量其表面金属碳化物面积，计算出不同添加剂所生成的金属碳化物在不同浓度和粒度的金刚石中所生成强度的排序，从而确定不同金属碳化物及其物理力学性能的差异，为金刚石制品的生产与开发提供理论依据。     

金刚石中的高钾高氯包体和地幔交代作用

在山东产出的两颗八面体金刚石中发现高钾高氯包体(K 48～58wt％,Cl 37～48wt％)。与之伴生的有碳质物和硅酸盐矿物包体。高钾高氯包体及其共生组合代表了金刚石生长初期阶段陷获的上地幔液相物质。这些液相物质富H_2O、K、Cl和碳质,并联系着地幔交代作用,其中碳质物可能是金刚石生长的碳源。     

高强度粗颗粒金刚石的合成技术研究

在高温高压下,六方晶格的石墨转变为立方晶格的金刚石。选用灰分含量少、气孔分布均匀的T621A石墨为碳源,选择化学成分范围偏值小、杂质含量少的镍锰钴合金为触媒以及优质粉压叶腊石为传压介质,在高温、适压、长时间及其它条件下,合成高强度粗颗粒的优质金刚石取得了良好的效果。     

铀矿床勘探类型之定量划分

本文提出矿化连续性分类法,它根据大矿体储量比例,将铀矿床划分为9个勘探类型。     

Thermal analysis in the laser-heated diamond anvil cell

A new technique actively controls thermal radiation and monitors sample properties during laser-heating in a diamond anvil cell. The technique can be described as a qualitative application of thermal analysis. Discontinuities in temperature, laser power, visible thermal radiation, or in their derivatives as functions of time can be associated with the enthalpy of phase transitions (such as melting) or with changes in maternal properties (such as emissivity).The technique is illustrated with melting experiments on iron-magnesium-silicate perovskite. Temperature corrections associated with these experiments are discussed and the results are briefly reviewed.     

岫岩5.4级地震前后拐角频率比的变化特征

本文在利用多台研究1999年11月29日和2000年1月12日发生在辽宁岫岩Ms5.4级和5.1级地震前拐角频率比随时间变化的基础上,对岫岩、营口、苏家屯、丹东、宽甸、北镇、新民单台记录的纵横波拐角频率比fcp/fcs做了比较详细的波谱分析。结果表明:在震中距小于200 km以内的不同方向的台站,记录到的地震波拐角频率比值在5.4级前和后均出现不同程度的异常显示,能够捕捉到一些带有短临性质的信息,不过,距震中较远的台站,地震波拐角频率比值在震前异常不如近台明显,表明不同距离的台站,记录的地震拐角频率比值存在着差异。