Experimenta l study on ultrasonic propagation in water-based bentonite slurry

Drilling fluid is a common flushingmedium used in pile foundation, geological drilling and petroleum drilling. Study on ultrasonic propagation properties in drilling fluid is of vital importance, not only for developing equipments to non-contact measuring concrete casting level for bored pile, but also for developing equipments considering drilling fluid as signal channel. The existence of clay particlesmakes the ultrasonic propagation and attenuation in drilling fluid much different from pure water. In order to know the relation among ultrasound frequency, slurry density and depth, a series of laboratory experiments about ultrasound propagation in water-based bentonite slurry were finished. Wavelet method was adopted to process the gained original waves of ultrasonic propagation in slurry, so we knew the velocity and attenuation coefficient of ultrasound propagated in different drilling fluids with different density. The first group experiments shows that with density of drilling fluid increase, ultrasonic velocity will decrease but attenuation coefficient will increase if ultrasonic frequency keep constant. The second group experiments shows that the power of ultrasound will intensify in small bore hole, the attenuation coefficient ismuch smaller than theoretical value.     

临沂市加强土地开发整理推动新农村建设

土地开发整理与新农村建设相结合,是当前社会关注的热点之一。临沂市高度重视通过土地整理促进新农村建设,自2003年以来,共实施国家和省、市、县四级土地开发整理项目1335个,累计投入11．12亿元,项目总规模14．4万hm^,新增耕地2．2万hm^2。通过实施土地开发整理,新建灌溉渠系1930km,排水沟2315km,新上泵站313个,农用井661眼,新上输变电线路287km,     

板块俯冲带岩浆作用过程的研究

综合分析了板块俯冲带岩浆活动的物质来源、岩浆上涌直至喷出的地球化学过程以及与这些过程相对应的时间尺度等研究的进展,指出了目前研究中存在的主要问题,并建议我国在该领域开展相关的研究中应:1)首先利用独有的地理优势,以处于弧后扩张作用早期的冲绳海槽为研究对象,开展相关的调查与研究;2)积极引进先进的技术手段;3)通过加强国际合作,积极参与国际合作项目,拓展研究领域.     

基于GEI和IGSO卫星的Sagnac效应的求解

本文根据卫星共视法进行时间比对的基本原理,详细介绍了Sagnac效应产生的原因.并分别以静止地球同步轨道卫星、倾斜地球同步轨道卫星为例,推导了卫星共视法时间比对中Sagnac效应在地心惯性系中的基本计算模型,给出了当地面站在赤道上和不在赤道上这两种情况下Sagnac效应的详细计算过程,得出了当地面站与卫星的经度相同以及当地面站与卫星在两极地区这两种情况下Sagnac效应的值为零的结论.这对于地面站之间的时间同步以及卫星导航定位具有重要的参考价值和实用意义.     

IMU/DGPS系统辅助ADS40三线阵影像的区域网平差

推导ADS40航带间外方位元素归一化处理的数学公式,设计一种描述IMU/DGPS系统误差的数学模型,采用改进的定向片内插模型实现ADS40影像的区域网平差.试验结果表明,仅需一个地面控制点,IMU/DGPS数据的定位精度就可显著提高,在四角布设地面控制点的情况下,IMU/DGPS数据与ADS40影像的联合平差可得到优于1.5个像素的3维定位精度;构架航线对平差结果的改善作用有限,在作业中采用的必要性不大.     

钼镍矿床地质特征及找矿标志

本文对湘西沉积型钼镍矿床地质特征进行了总结分析,对开展湘西北地区钼镍矿找矿具有一定指导意义。     

福建东山岛附近海域造礁石珊瑚共生藻的分子系统分类和遗传多样性研究

本研究利用核糖体大亚基5'端序列PCR-RFLP以及转录单元内间隔区(Internal TranlsclqIbed Sppacer,rrS)序列分析相结合的方法,首次对福建东山岛附近海域3种优势种类造礁石珊瑚共生藻进行了分子系统分类和遗传多样性研究.PCR-RFLP分析发现东山岛附近海域3种优势种类造礁石珊瑚共生藻都属于C系群共生藻,而ITS序列的序列分析结果表明东山岛附近海域3种优势种类造礁石珊瑚共生藻都属于C1亚系群.研究结果表明ITS序列进化速度快,适合于造礁石珊瑚共生藻属亚系群水平的鉴定.而东山岛附近海域造礁石珊瑚共生藻的多样性低,暗示东山岛附近海域造礁石珊瑚共生藻共生系统面对外界环境压力的适应能力较低.     

Cr^3＋在改善三元复合驱中的作用实验研究

在三元复合驱矿场应用实践中,由于三元复合体系自身流度控制能力的局限性,必须通过聚合物凝胶前置段塞来改善吸液剖面,这就涉及到聚合物凝胶与三元复合体系的配伍性。通过向三元复合体系中加入有机铬,考察Cr^3＋对三元复合体系黏度、界面张力和阻力系数等性能影响,进而对Cr^3＋聚合物凝胶与三元复合体系配伍性以及Cr^3＋在改善三元复合体系性能方面的作用做出评价。结果表明,Cr^3＋的加入对三元复合体系黏度和界面张力影响不大,但阻力系数和残余阻力系数却明显增加。当采用Cr^3＋聚合物凝胶作为前置段塞或采用添加Cr^3＋的三元复合体系进行复合驱油实验时,其采收率增加幅度都要高于普通三元复合驱。这不仅显示出Cr^3＋聚合物凝胶与三元复合体系间良好的配伍性,而且为改善三元复合驱增油效果提供了新的途径。     

BTEX anomalies used as indicators of submarine oil and gas reservoirs

It is a conventional method for petroleum prospecting to generally use paraffin hydrocarbon as basic indexes of oil and gas. This conventional geochemical technology, however, shows some limits in the prospecting as paraffin is vulnerable to influences from human and biologic activities. Consequently, BTEX (short for benzene, toluene, ethyl benzene and xylem, which are direct biomarkers) among aromatic hydrocarbon series has been taken into account for the oil and gas prediction. Domestic and foreign study results demonstrate that BTEX is hardly disturbed and can well indicate oil and gas reservoirs. Based on measured data from a South China Sea area, the present authors have used self-developed visual assessment software for petroleum prospecting has been used to process data, strip background anomalies, and outline significant BTEX anomalies. By comparison with stratigraphic profiles of the target area, it is confirmed that BTEX is a good indication of marine oil and gas during the petroleum prospecting.     

单环刺螠纤溶酶的分离纯化及其性质的初步研究

从单环刺中制得单一组分的纤溶活性纤溶酶,并对其性质进行初步研究.单环刺体组织液经离心,超滤,离子交换层析,凝胶过滤等方法进行分离纯化,制得单一洗脱峰酶组分,经Native-PAGE电泳分析,SDS-PAGE电泳分析和飞行质谱分析,鉴定了酶制品纯度和相对分子量,进行了体外溶血栓试验.所得纯品UFEIa水解酪蛋白的比活力为442.0 U/mg,纯化倍数为12.1倍,回收率为27.0%.UFEIa为单一组分,相对分子量约23 800 Da.体外溶血栓实验表明此纤溶活性蛋白酶与蚓激酶相比具有很好的溶血栓活性.