基于砂砾质辫状河沉积露头隔夹层研究

以准噶尔盆地西北缘扎伊尔山出露的三叠系克拉玛依组黑油山沟35 剖面为例,利用岩相组合和层次界面分析方法,结合沉积学理论,探讨了砂砾质辫状河岩石相组合、构型界面及构型单元级次,进而研究砂砾质辫状河河道砂体内部隔夹层的成因、级次、形态、规模及其控制下的渗流地质差异特征。结果表明,在研究区可以识别8 种典型岩相,8 个5 级储集体构型单元以及2 个3 级储集体构型单元。泥质隔夹层主要分为细粒沉积和泥砾型两种类型,泥砾型隔夹层主要发育在河道底部泥砾岩沉积,由河道侵蚀河岸或河底的泥岩快速堆积而成,主要分布在5 级或3 级界面之上,向河道两侧边缘减薄尖灭。同时,内部不同级次的泥质隔夹层控制了储层非均质。     

基于调度效益最大化的多功能组网认知雷达资源优化调度算法

在组网认知雷达中,针对多目标多任务(如搜索、跟踪与成像等)按优先级进行资源调度时易造成目标任务丢失的问题,提出基于调度效益最大化的多功能组网认知雷达资源优化调度算法。该算法将搜索与跟踪任务的时间窗考虑到目标函数中,通过目标任务的重要性(优先级)和有效性(时间窗)两个因素的加权来表示雷达对目标任务的调度效益,根据调度效益最大准则建立并利用遗传算法求解资源调度模型。对仿真结果分析表明,该方法能够提高组网认知雷达的整体效能。     

汉语并列复句的自动识别方法

针对汉语句际关系中分布最广泛的并列复句, 提出一种自动识别的方法。通过对句子语义相似度和结构相似度的计算, 使用基于词义的句子相似度计算、最大公共子串、最大谓词周边匹配长度、加重特定词语复现等方法, 在广义并列关系上进行评测。最后将其中3种方法进行集成, 并取得了较为理想的效果。     

Single-negative properties of Ba2Co1.8Cu0.2Fe12O22 and Ba3Co2Fe23.4Zn0.6O41 hexagonal ferrites

The electromagnetic properties of Ba₂Co_1.8Cu_0.2Fe₁₂O₂₂ (Co₂Y) and Ba₃Co₂Fe_23.4Zn_0.6O₄₁ (Co₂Z) were studied by measuring microwave scattering parameters. In the transmission spectra of Ba₂Co_1.8Cu_0.2Fe₁₂O₂₂, a forbidden band emerges due to ferromagnetic resonance, and the permeability will turn to negative in the vicinity of the ferromagnetic resonance frequency. In the complex permittivity spectra of Ba₃Co₂Fe_23.4Zn_0.6O₄₁, the negative permittivity can be obtained due to dielectric resonance. Therefore, Co₂Y and Co₂Z can be used to construct left-handed materials possessing negative permeability and negative permittivity simultaneously.     

基于自组装胶体晶体构筑有序微结构

有关胶体晶体自组装以及以胶体晶体为模板制备有序图案化微结构方面的研究, 由于方法简便、结构多样、重复性好等优点, 近年来受到越来越多的关注. 本文系统总结了我们在胶体微球和胶体晶体领域开展的研究工作, 主要包括: 无机或聚合物胶体微球的设计制备、纳米复合及功能化; 结合聚合物材料可溶涨、可拉伸、热形变等特性构筑图案化胶体晶体、非球形对称胶体晶体、非紧密堆积胶体晶体等特殊结构; 以胶体晶体为模板制备三维大孔骨架、纳米环、纳米碗阵列等有序微结构等.     

1998-2008年人因可靠性研究进展

人因可靠性研究是系统可靠性研究的重要组成部分.利用美国工程索引Ei数据库,维普中文科技期刊数据库,以人因可靠性为主题词,检索了国内近10年有关人因可靠性研究论文.根据发表时间、作者国家、应用领域分别进行了统计.分析统计结果发现,目前人因可靠性研究主要侧重于人因可靠性分析方法的研究,而人因可靠性研究范围主要侧重于核电业、航空航天业、石油化工业及军工业等领域.中国在该领域的研究也处于世界前列,但同美国相比还存在很大的差距.最后综述了人因失误理论和人因可靠性分析方法,展望了未来人因可靠性研究的发展趋势.     

Growth potential of human hepatocarcinoma cells in the liver of neonatal immunocompetent mice and its relation to immunological tolerance

To determine the pathological behavior of human hepatocarcinoma cells in the liver microenvironment of neonatal non-immunode-ficient mice, three human hepatocarcinoma cell lines (Bel7402, HepG2, and SK-Hep-1), traced by DiI, were transplanted into the intrahepatic or subcutaneous tissue of neonatal and adult Kunming mice. Histopathological observations showed that cells in the adult liver induced a severe immune response as early as the second day after the implantation, while the subcutaneous neoplasm underwent extensive necrosis by the end of the study. Only the cells injected into the neonatal liver underwent a delayed immunologic rejection in the organ microenvironment. These cells retained recognizable tumor features over the first seven days, and displayed an intrahepatic invasive pattern. The expression of tumor markers including alpha-fetoprotein and survivin was maintained. The quantitative ELISA for the expression patterns of IL-2 and IL-10 also confirmed that the intrahepatic immunity was non-susceptive during this period. The high serum alpha-fetoprotein level was inversely correlated with the change in immune response. Our study provided a bio-system for the research of immune responses to xenografts in the liver.     

Detection of dynamic brain networks modulated by acupuncture using a graph theory model

Neuroimaging studies involving acute acupuncture manipulation have already demonstrated significant modulatory effects on wide limbic/paralimbic nuclei, subcortical gray structures and the neocortical system of the brain. Due to the sustained effect of acupuncture, however, knowledge on the organization of such large-scale cortical networks behind the active needle stimulation phase is lacking. In this study, we originally adopted a network model analysis from graph theory to evaluate the functional connectivity among multiple brain regions during the post-stimulus phase. Evidence from our findings clearly supported the existence of a large organized functional connectivity network related to acupuncture function in the resting brain. More importantly, acupuncture can change such a network into a functional state underlying both pain perception and modulation, which is exhibited by significant changes in the functional connectivity of some brain regions. This analysis may help us to better understand the long-lasting effects of acupuncture on brain function, as well as the potential benefits of clinical treatments.     

保护卡在机房管理中的应用

高校计算机实验室承担着重要的实验教学任务,所以科学高效的管理就成为正常教学的保证.本文从实际应用的角度出发,简单介绍了在机房管理工作中如何科学使用保护卡以达到高效管理的目的,并辅助以实例具体阐述了相关内容.     

农村教师专业化素质的特殊要求

农村教师劳动既具有教师劳动的一般特点,又具有其劳动的特殊性,突出表现为教师劳动的多面性、独立性和艰苦性。由此对农村教师专业化素质提出了特殊要求,主要是热爱农村教育、关爱农村学生的教师职业道德;"一专多能"的教师知识和能力,特别是适应农村教学工作需要的学科专业知识和技能,以及创新能力;更需要有为农村教育事业"捧着一颗心来,不带半根草去"的献身精神。