利用Eaton法计算地层孔隙压力的不确定性分析

鉴于地层孔隙压力不确定性给钻井工程设计与施工带来的诸多困难,提出孔隙压力不确定度的概念,并对其不确定性进行定量表征。以目前应用最为广泛的Eaton法为例,推导了孔隙压力不确定度的理论计算模型,模型考虑了数据测量误差、压实趋势线方程、Eaton指数、上覆岩层压力以及静水压力等因素,并利用中国石化PG地区综合矿场数据进行了算例分析。结果表明,该方法给出了孔隙压力不确定度的范围、影响主因素以及相关因素对不确定度的影响规律,且计算结果与录井钻井液密度、试气实测结果相符,证明提出的孔隙压力不确定性评价方法可行,计算结果真实、可靠。     

学校WindowsNT教学局域网的安全措施

学校教学网络大多是采用服务器 +有盘工作站架构 ,局域网络的安全对保障基于计算机的教学十分重要。本文介绍了保护WindowsNT局域网网络安全的一些管理措施 ,通过我系局域网运行情况来看 ,较好的保证了网络的安全 ,为我系教学提供了良好的保证     

SSCP技术在厌氧折流板反应器运行控制中的应用

运用单链构象多态性(SSCP)技术,采用真细菌的通用引物SRV3-2P和BSF8/20,分析了处理大豆蛋白废水的厌氧折流板反应器(ABR)中的厌氧污泥微生物群落结构,并通过UPGMA群落聚类分析方法对各格室细菌的遗传距离进行了分析。结果发现,有机负荷不仅会影响ABR内各细菌类群的生长,同时也会改变细菌群落的结构和不同细菌类群在各格室的分布;随着有机负荷的逐步提高,ABR各格室细菌的遗传距离逐渐增大,特异性随之增加;用SSCP和UPGMA群落聚类分析方法分析污泥样品,可以对ABR的运行起到很好的指导作用。     

水力喷射径向水平井技术在煤层气开发中的应用

为了解决煤层气地面钻井中钻井、固井及压裂造成的污染而产生的近井堵塞,采用水力喷射径向水平井技术,打通污染及堵塞带,沟通煤储层的裂缝系统。结果表明:将这一技术引入煤层气开发中,对因近井带污染等因素造成煤储层渗流通道不畅的煤层气井,即可以实现解堵作用,又可以沟通近井带以外的更多微裂隙及裂缝,降低流体流动摩阻,提高通道导流能力,达到气井增产的目的。该项工程工艺技术为煤层气地面钻井开发提供了一项新的增产措施和方法。     

海战场的目标检测与识别

针对海战场图像信息的目标检测与识别,提出了一种适于海战场区域特征的遥感图像目标检测与识别方法．研究采用线性滤波器将图像划分为若干个空间尺度,并对不同空间尺度的图像,根据生物视觉生理特性的原理,提取图像中目标的视觉显著性特征,此特征包含目标不同于其周围区域的程度和空间分布状态．根据分析提取的目标空间特征信息,使用支持向量机对视觉显著性特征图像进行分类,实现目标信息提取,并通过Dempster-Shafer证据理论的分析方法判断目标的相关信息及其置信度,达到识别目标的目的．实验结果表明：此方法能以高可靠性和高精确度检测出海战场图像信息中的目标,获取目标相关信息．     

Growth and characterization of large, high quality cubic diamond crystals

High quality cubic diamond crystals were grown using the temperature gradient method at high pressure and high temperature(HPHT),in a new FeNi alloy as solvent.The crystals were grown at relatively low temperatures suitable for the growth of {100} faces.An increase in the radial growth rate,and inhibition of the axial growth caused the growth of large,high quality cubic diamond single crystals at high growth rates.For example,over 33 h,the radial growth rate was 0.22 mm/h,while the axial growth rate was only 0.08 mm/h;the growth rate by weight was also increased to 7.3 mg/h.The yellow color of our crystal samples was more uniform than samples from Sumitomo Corporation of Japan and Element Six Corp.The Raman FWHW of the 1332 cm 1 peak in our diamond sample was smaller than the Element Six Corp.sample,but larger than that of the Sumitomo Corp.sample.The nitrogen content of our diamond samples was 240 ppm,which was much higher than the Sumitomo and Element Six samples because of the higher growth rate of our diamond samples.     

壳聚糖载药微球的制备和体外释放研究

以壳聚糖(CS)和盐酸左氧氟沙星(LVFX)为原料,通过乳化交联法制备CS载药微球,应用显微镜、扫描电镜考察载药微球微观形态,建立恒温恒速流动药物溶出系统检测微球中药物体外释放特性和影响因素.结果发现:微球理化特性受壳聚糖脱乙酰度、壳聚糖醋酸溶液浓度、交联剂用量等工艺条件影响,微球载药量与壳聚糖降解程度、CS与LVDX...     

Analysis of period doubling bifurcation and chaos mirror of biped passive dynamic robot gait

With a reasonable parameter configuration,the passive dynamic walking model has a stable,efficient,natural periodic gait,which depends only on gravity and inertia when walking down a slight slope.In fact,there is a delicate balance in the energy conversion in the stable periodic gait,making the gait adjustable by changing the model parameters.Poincaré mapping is combined with Newton-Raphson iteration to obtain the numerical solution of the final state of the passive dynamic walking model.In addition,a simulation on the walking gait of the model is performed by increasing the slope step by step,thereby fixing the model’s parameters synchronously.Then,the gait features obtained in the different slope stages are analyzed and discussed,the intrinsic laws are revealed in depth.The results indicate that the gait can present features of a single period,doubling period,the entrance of chaos,merging of sub-bands,and so on,because of the high sensitivity of the passive dynamic walking to the slope.From a global viewpoint,the gait becomes chaotic by way of period doubling bifurcation,with a self-similar Feigenbaum fractal structure in the process.At the entrance of chaos,the gait sequence comprises a Cantor set,and during the chaotic stage,sub-bands in the final-state diagram of the robot system present as a mirror of the period doubling bifurcation.     

一种机组优化启停的新型启发式方法

提出了一种机组优化启停的新型启发式方法。首先利用动态规划法求出计算负荷下各个待开机组的最优启停状态及组应的启停费用,将效率最高的机组投入运行,然后用拉格朗日松驰法进行了最优经济分配。     

单片程控双二次CMOS OTA—C可变迟延均衡器

报导了由ＣＭＯＳ跨导运算放大器（ＣＭＯＳ ＯＴＡ）和电容（Ｃ）实现的双二次可变迟延均衡器,其迟延曲线形状和最大迟延频率可分别由各自控制电流调节。该电路中无电阻,易于单片集成。设计了具有新型输入级的ＯＴＡ,它大大扩展了线性输入范围和改善了非线性误差。详细分析了双二次迟延均衡器的原理,提出了实现均衡器的电路结构,给出了电路的计算机模拟结果。