储层石蜡沉积预测技术研究与应用

在油田开发过程中 ,由于油藏温度、压力等条件的变化 ,高含蜡原油在近井带容易产生石蜡沉积 ,堵塞地层孔隙或裂缝 ,严重影响油田开采 ,尤其对于低渗油田 ,伤害特别严重。文中应用理想溶液理论、质量守恒和能量守恒等基本原理 ,建立更符合油田实际情况的油藏中石蜡沉积预测数学模型 ,开发一套方便实用的油藏中石蜡沉积预测软件系统FPOS1 0。在此基础上 ,应用室内实验数据和现场数据对吉林新民油田油井石蜡沉积情况进行预测和现场拟合 ,确定新民油田临界石蜡沉积半径为 2 5m ,快速、准确地为现场清防蜡措施提供理论依据。     

软磁材料基本磁化曲线测量系统

本文描述了一套适用于软磁材料基本磁化曲线测量的软件系统.基于Rowland方法,系统校正次级磁感应强度(B)与初级磁场强度(H)的相位关系并能实时滚动显示初、次级信号波形及磁滞回线以及自动测量磁化曲线.系统具有较高自动化数据采集与数字处理能力,适用于磁屏蔽室建设中用到的大量矩形1J85型坡莫合金磁滞回线和基本磁化曲线测量.     

物探在白岭铜锌矿床勘探中的应用效果

白岭铜锌矿床位于近接触带部位,断裂构造及围岩蚀变发育,地球物理异常十分明显。应用高精度磁测、激电中梯和测 深等物探方法,在白岭铜锌矿床进行综合勘查,结果显示出了较好的地质找矿效果,说明高磁、激电等物探异常对圈定矿体位置和产状、缩短勘探周期具有重要的指导意义。     

典型燃煤机组SCR脱硝还原剂尿素制氨技术经济比较分析

对脱硝还原剂尿素制氨工艺进行技术及经济比较分析,可为当前环保形势下燃煤机组液氨改尿素工程技术经济分析提供借鉴及指导.以某5个电厂13个选择性催化还原(SCR)脱硝还原剂采用尿素替代液氨改造项目为例,分析比较采用尿素热解电加热器制氨、尿素热解烟气换热器制氨和尿素水解制氨3种改造方案的技术特性及物耗水平、投资费用、运行成本...     

遵钢水处理工程一次铁皮沉淀池沉井施工技术

施工中常用的沉井大都是圆形的,介绍的沉井是长方形且尺寸较大,下沉过程中会有一些难度,针对遵钢一次铁皮沉淀池实例详细介绍沉井下沉、封底砼厚度验算、沉井稳定性验算、封底后抗浮稳定性验算等的计算方法,叙述了沉井制作、下沉施工过程及沉井施工中常见问题的预防措施和治理方法     

薄差低阻油层流体识别新技术

在总结已往研究工作的基础上,给出了一种新型流体识别技术.该技术首先对纯油层、纯水层分别建立不同电阻率测井参数与储层岩性、物性、层厚参数关系方程,确定了油水分布规律,继而采用距离判别法对每一对电阻率参数方程计算属性概率,最终将不同的电阻率测井判别属性概率优化确定最优权值,归并为综合技术.这项技术经12口投产开发井验证,符合率达87.7%,较以往方法有了显著提高.     

Scaling of Spatial Reuse and Saturation Throughput in a Class of MAC Protocols

In this paper, we investigate the spatial reuse and saturation throughput of static ad-hoc networks with unbiased medium access control (MAC) protocols. Under the stochastic assumptions of our model, we obtain the upper bound on the equivalent saturation throughput of such MAC protocols as a function of node density. We also obtain the scaling properties of the spatial reuse and saturation throughput.     

DTV发射机的效率——降低成本和减少环境污染的新机遇

今后几年,数字地面电视系统在全世界范围的引入将导致大量新发射机的安装。随着能源涨价和增加对环境污染的关注,新安装发射机尽可能地提高能源利用效率变得越来越重要。本文讨论有关DTV发射机能源利用效率的各种问题以及描述包络跟踪技术对于降低新的数字网络运行成本和环境污染的贡献。     

A distributed coordination scheme to improve the performance of IEEE 802.11 in multi-hop networks

This paper investigates the performance of IEEE 802.11 in multi-hop scenarios and shows how its aggressive behavior can throttle the spatial reuse and reduce bandwidth efficiency. An adaptive, layer-2, distributed coordination scheme for 802.11 using explicit medium access control (MAC) feedback is then proposed to pace the transmissions on adjacent nodes, thereby assisting the MAC protocol to operate around its saturation state while minimizing resource contention. Simulation results show that the proposed scheme outperforms the original 802.11 MAC.     

Controlled growth of nanocrystalline aluminum nitride films for full color range

Color films are widely used for visual effect as well as for their functional properties. To date, however, synthesizing thin films with desired color remains challenging. In this work, AlN color films are deposited on Si wafers by precise control of the deposition time for different thickness during reactive magnetron sputtering from an Al target in Ar/N₂ atmosphere. The thickness, morphology, structure, composition and color index are carefully examined by field emission scanning electron microscopy, atomic force microscopy, grazing incidence X-ray diffraction, X-ray photoelectron spectrometry and colorimeter, respectively. As the film thickness changes from 57 nm to 165 nm, the film exhibits purple, indigo, blue, green, yellow, orange and red in color. These colors repeat in the same order when the thickness goes over 165 nm. Once the thickness exceeds 467 nm, overlapping of colors takes place. The mechanisms are elucidated.