华北油田隐蔽油藏勘探实践与认识

随着勘探的不断深入,华北油田富油凹陷构造油藏的勘探程度越来越高,勘探对象日趋复杂,勘探难度越来越大。面临勘探现状,华北油田认真分析勘探形势,立足资源基础,解放思想,积极转变勘探观念,有意识地加强隐蔽油气藏的深入研究与勘探,先后在冀中坳陷的饶阳凹陷、二连盆地的巴音都兰凹陷、乌里雅斯太凹陷等发现了多个规模富集的隐蔽油藏。通过隐蔽油藏的勘探实践,取得了四点主要认识、六点重要启示,对今后深化华北油田隐蔽油藏的勘探具有重要的指导作用。     

低掺杂浓度Nd:YVO4激光器的输出特性研究

在对Nd:YVO_4晶体的掺杂浓度和晶体长度对激光器性能的影响进行了分析后,报道了利用掺杂浓度为0.3at％,通光长度为10mm的Nd:YVO_4晶体作为增益介质,带光纤耦合的激光二极管端面抽运的Nd:YVO_4激光器。在抽运功率为27.365W时,获得了14.85W的TEM_(00)模输出,光一光转换效率为60.49％,斜效率达64.5％。     

Occlusion-resistant camera design for acquiring active environments.

In this article, we present a detailed theoretical analysis and a prototype implementation of a family of cameras designed with the explicit goal of detecting and removing interfering dynamic occluders in real time, during live capture, as opposed to fixing the resulting artifacts a posteriori. Such an early-acquisition approach improves efficiency: more valid samples are acquired faster without worrying about moving occluders. One option for designing a camera to be unaffected by moving occluders is to sample through the occluder, but true x-ray-like vision is technically impractical. Another option is to sample around the occluder using a camera with a large effective aperture, but such an approach requires a bulky acquisition device. Yet another possibility of sampling around an occluder is to rely on second and higher order reflected rays that indirectly sample surfaces not directly visible. However, devising an acquisition device sufficiently sensitive and efficient to capture large environments using reflected rays will remain challenging for the foreseeable future.     

Observation of atomic steps on CaCO3 crystal surface

By using scanning polarization force microscopy,the deliquescence process and the atomic steps on the cleavage surface of CaCO3 in air were studied in situ.Under an exposure to medium umidity(-57%),the sloiw step movement has been observed.     

NexGen的Nx586－Pentium的又一个挑战者

本文简单介绍ＮｅｘＧｅｎ公司最新设计出的Ｎｘ５８６ＣＰＵ。它是一种８０×８６兼容的处理器，文中介绍了它的微体系结构，ＲＩＳＣ８６指令等。     

DF_4内燃机车柴油机润滑油的热重分析

通过对DF_4内燃机车柴油机润滑油的热重曲线TG和微商热重曲线DTG的分析,探讨了这种润滑油的衰变规律。     

单片InGaAs／InP PIN PD阵列

文章简要地介绍了ＩｎＧａＡｓ／ＩｎＰ ＰＩＮ ＰＤ阵列的制作现状及其应用和发展趋势。     

乌江渡水电站大坝安全监测自动化系统的实施

通过对乌江渡水电站大坝安全监测自动化系统的总体设计、分步实施阐述,总结大坝安全监测自动化系统的改造经验,对其他大坝安全监测自动化系统改造工作具有借鉴作用。     

A functional-dependencies-based Bayesian networks learning method and its application in a mobile commerce system.

This paper presents a new method for learning Bayesian networks from functional dependencies (FD) and third normal form (3NF) tables in relational databases. The method sets up a linkage between the theory of relational databases and probabilistic reasoning models, which is interesting and useful especially when data are incomplete and inaccurate. The effectiveness and practicability of the proposed method is demonstrated by its implementation in a mobile commerce system.