The electrical conductivity of H2O at 0.21– 4.18 GPa and 20–350°C

The electrical conductivity of H₂O in solid and liquid phases has been measured at 0.21–4.18 GPa and 20–350°C. The results indicate: (I) different phases of H₂O in solid have different relations between electrical conductivity and temperature and pressure. The conductivity changes continuously with temperature, but discontinuously with the pressure between 2.11 and 2.58 GPa, which corresponds to the transforming pressure between ice (VI) and ice (VII);(II) the amductivity of H₂O in liquid all increases with temperature and pressure, but there are discontinuities at pressures between 0.57 and 0.9 GPa, and between 2.11 and 2.58 GPa, which are also consistent with the polyrnorph of ice (ice (V), ice (VI) and ice (VII)). This reflects that H₂O in liquid at different pressures has quite different properties of electron chemistry. It is probably the important reason that causes the layers with high electrical conductivity and low velocity in the earth’s ceust and upper mantle.     

Ultrahigh-pressure (4.5–5.5 GPa) experimental research on pyroxene-garnet transition and its significance

Conclusions The transition from natural Al-enstatite to garnet and Al-poor pyroxene has taken place under the condition of about 1000°C and 4.5–5.5 GPa, and new phases of garnet and corundum have formed when 15% Al₂O₃ was added to the initial natural Al-enstatite. This experimental result has explained the ultrahigh pressure (3.5–5.0 GPa) and relatively low temperature (< 1000°C) genesis of the ultramafic rock of high-pressure metamorphic zone in Dabieshan-northern Jiangsu-Jiaodong and of red corundum garnetite coexisting with garnet peridotite. From the genetic mineralogy, petrology andP-T equilibrium conditions of garnet peridotite of the high-pressure metamorphic zone, kimberlite and Cenozoic basalt and the ultrahigh pressure experimental result, it is inferred that the upper mantle garnet peridotite is transformed with the increase of depth from Al-rich pyroxene garnet peridotite (80–120 km) to Al-poor pyroxene garnet peridotite (greater than 120–150 km).     

陕甘川相邻区区域成矿规律及找矿模型

陕甘川相邻地区是我国重要的贵金属和有色金属成矿区，资源潜力巨大，金、铜、铅、锌为区内优势矿产，划分了主要矿床类型，总结了区域成矿规律，提出了“线一环结合，凹凸兼顾；区别矿种，着重类型；活用物化遥重异常”的找矿模型。     

基于数据挖掘的VaR测量算法研究

提出了将数据挖掘中分位数图的思想应用于VaR测量的新方法，为风险控制和投资决策探索了一种新思路．从设定时间区间内的证券组合对数收益率序列里，求出给定置信水平下不同时间段的分位数，得到分位数序列，由此建立回归方程，预测组合未来特定一段时间内收益率序列的分位数，然后再根据组合的市值大小，直接计算出VaR值．该算法能够有效地处理纽合收益非正态分布和非线性纽合的情况，在社保基金投资管理系统中得到应用，在国内证券市场数据上进行实验，并采用失败频率检验法来验证算法的精确性，结果表明，该算法是可靠的，有较好的鲁棒性、     

生化反应中一类2n+1次动力系统的定性分析

应用微分方程的定性理论，研究了生化反应中的一类饱和反应的数学模型，完整地解决了该系统极限环的存在性、不存在性以及极限环的存在惟一性。     

可溶性后过渡金属盐催化分解H2O2活性研究

研究了第一系列可溶性后过渡金属盐对 H2 O2 分解反应的影响。结果表明 ,2 5℃时可溶性后过渡金属盐中 ,铜 ( )盐的催化活性最高 ;其催化活性与所含阴离子种类有关 ,不同可溶性铜( )盐的活性高低次序为 Cu( Ac) 2 ·H2 O>Cu SO4· 5 H2 O>Cu Cl2 · 2 H2 O>Cu( NO3 ) 2 · 3H2 O·3H2 O。文中对其催化机理进行了分析。     

一种基于DSP的智能型高压开关保护装置的设计

智能型保护装置是高压开关的中枢控制部件．TMS320LF2407是TI公司新推出的DSP产品，优越于一般微机型测控单元中大量使用的MCU，表现为低成本、低功耗、高性能的处理能力．本文讨论的是以LF2407型DSP为核心的模块在智能型高压开关保护装置中的应用，并给出了相应的硬件、软件的实现方案．     

高血压病人无症状性颅内动脉病变的危险因素探讨

目的:探讨高血压病人无症状性颅内动脉病变的危险因素。方法:收集245例住院高血压病患者,排除合并中风或中风历史、糖尿病及其他颅内疾病患者。以经颅多普勒超声(TCD)检查动脉异常作为反映颅内动脉病变的指标,观察年龄、高血压病程、血脂代谢和血尿酸水平对颅内动脉病变的影响。结果:老年高血压患者总颅内动脉异常率和血速增快率(20 14%,13 50%)明显高于非老年组(13 34%,7 48%,各P<0 001),而两组间血速减慢率无差别。老年组各单一动脉异常率均较非老年组高,其中大脑中动脉、椎动脉之间差异有显著性(P<0 05)。病程超过10年的患者总颅内动脉异常率及颈内动脉系各动脉异常率明显增加(各P<0 01),但椎基底动脉系各动脉异常率增加不明显。Logistic回归分析显示甘油三脂(OR3 398,95%CI:1 211-7 831)、高血压病程(OR1 671,95%CI:1 063-3 327)、年龄(OR1 235,95%CI:1 023-1 640)和高血压病人颅内动脉异常密切相关(各P<0 05)。结论:年龄、高血压病程和甘油三脂是高血压病人无症状性颅内动脉病变的独立危险因素。