基于改进独立分量分析的湿地变化检测方法

以湖北省洪湖湿地为研究区,采用2000年7月27日和2002年7月9日ETM+多光谱影像作为遥感信息源,提出了一种基于改进独立分量分析（ICA）的湿地变化检测方法。首先对传统ICA从初始值选取和迭代过程两方面加以了改进。然后对原始多波段影像进行缨帽变换,提取前后时相的湿度分量作为输入的混合影像,进行改进ICA变换。最后在变换得到的独立分量基础上,对代表变化区域的独立分量进行自适应阈值分割,得到湿地变化检测结果。实验表明,改进ICA法检测精度较传统ICA法及分类后比较法有所提高。     

Effect of boron on inclusions morphology in tire cord steel

B₂O³ was added into tire cord steel during refining in carbon tube furnace.The influence of boron which was added in tire cord steel on the deformability of oxide inclusions was studied by metallographic and scanning electron microscope（SEM） observation.The melting points of boron-bearing compound oxide inclusions were calculated by the software of Factsage.The results showed that the most part of inclusions were boron-bearing compound oxide and their deformation properties were obviously improved by adding B₂O₃ in steel.As the boron content was increased from 0.0046%to 0.039%,the proportion of long strip type inclusions changed a little and the number of inclusions decreased.The low-melting point areas of MnO-SiO₂-Al₂O₃ and CaO-SiO₂-Al₂O₃ ternary system were increased due to adding B₂O₃ in steel.Moreover,the areas increased with the increasing of B₂O₃ content in conclusions.Evident effect on low-melting point inclusion occurred when B₂O₃ content went up to 5% in CaO-SiO₂-Al₂O₃ inclusions system and to 10%in MnO-SiO₂-Al₂O₃ inclusions system.     

国内气顶油藏开发实践及开发程序探讨

本文总结了国内陆上和海上3个气顶油藏的开发实践,主要为喇嘛甸气顶油藏、港深18-2断块和海上C油田一些重要开发阶段的开发特征和开发效果。通过这些开发实践经验,总结探讨了气顶油藏合理的开发程序。     

小气顶底水薄层油藏开发规律及技术政策

小气顶底水驱薄层油藏开发过程中,受气顶与底水的同时作用,油气水互窜,采油井生产气油比高、含水上升快,开发难度较大。文中借助油藏数值模拟技术,建立了此类油藏的机理模型,探究其生产规律与最优开发方式,并对气顶指数、底水倍数、油柱高度、垂向布井位置等参数进行敏感性分析。研究认为:小气顶底水薄层油藏在开发过程中气窜是无法避免的,其日产油量变化曲线表现出三段式特征,反映了气窜、油气互侵、底水侵入3个过程;此类油藏的最优开发方式为油气同采,在小气顶布井可以缩短油气互侵的时间,并在原油侵入气顶后采油;在较小气顶和较强底水的情况下,排气采油方式开发效果更好。     

承压螺栓超声检测中异常波分析

对螺栓进行超声纵波检测时,发现了与常见伪缺陷波不同的异常波,该波有能量高、不稳定、有规律、不遮挡螺纹波等特点,经分析后确定是耦合剂过多导致的盖帽反射波,不是缺陷波。     

Dense SiOC cap for damage-less ultra low k integration with direct CMP in C45 architecture and beyond

Deposited on a porous a-SiOC:H intermetal dielectric (IMD), a dense a-SiOC:H cap was successfully integrated in a C45 dual damascene architecture. The paper demonstrates that, stopping the CMP with around 10 nm of the cap left, the IMD integrity is preserved. As a consequence, a 3.5% decrease in RC delay, a 7.3% decrease in IMD integrated k-value and an increase of the time to failure by a 100 factor are reached relative to direct CMP. The cap also allowed to achieve straight lines and to improve the lines height uniformity as if CMP stopped on the IMD.     

循环流化床锅炉常用风帽出现的问题探讨

风帽作为循环流化床锅炉的重要部件之一,对锅炉的安全运行起着重要的作用。常用的风帽主要有：大直径T型风帽、大直径钟罩型风帽、小直径蘑茹状风帽、小直径柱状风帽、定向“7”字型风帽。文章介绍了常用风帽在运行中的常见问题,如局部堵塞、结焦、磨损、脱落等,针对这些问题进行了分析,并提出了相应的防范措施。风帽的形状不同,对炉内受热面的磨损程度和维护成本差别很大,笔者融合这几种风帽的优点提出了新型风帽的设想。     

Comparison of the Patient Health Questionnaire and the Older Adult Health and Mood Questionnaire for self-reported depressive symptoms after spinal cord injury.

Objective: To directly compare estimates of potential depressive disorders and clinically significant depressive symptoms using the Patient Health Questionnaire-9 (PHQ-9) and Older Adult Health and Mood Questionnaire (OAHMQ) among participants with spinal cord injury (SCI). Research Design: 727 participants from a hospital in the Southeastern United States were administered the PHQ-9 and OAHMQ during a follow-up survey. We compared the rates of depressive disorders using cutoff scores and diagnostic criteria for each instrument. No independent psychiatric diagnostic interviews were conducted. Results: The PHQ-9 and OAHMQ were significantly correlated (r = .78), and both were correlated with satisfaction with life (r = ?.48, ?.54). Using recommended diagnostic scoring procedures, 10.7% of participants met the diagnostic criteria for major depressive disorder with the PHQ-9; 9.3% met the criteria for major depression based on PHQ-9 ≥ 10; and 19.7% based on PHQ-9 ≥ 15. Using the OAHMQ, 19.7% reported probable major depression and 44.5% clinically significant symptomatology. Conclusions: The measures were highly correlated overall. However, the estimated prevalence of depressive disorders varied substantially between the 2 instruments. These estimates were comparable to those previously reported for each instrument (i.e., higher rates with the OAHMQ). Therefore, differing estimates of depressive disorders reported in the literature using these instruments were largely attributable to the instruments themselves. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

编织型导爆索研究

介绍了编织型导爆索的主要生产工艺和材料、设备的选择,比较了编织型和缠绕型、拉拔型导爆索的性能指标,得出编织型导爆索的综合性能明显优于缠绕型和拉拔型导爆索的结论。可为今后编织型导爆索的研究和生产提供借鉴。