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伽师近场地震资料处理--三维速度成像 总被引：3，自引：0，他引：3
利用三维速度结构和震源位置的联合反演方法,处理了伽师近场地震资料,得到强震区 2 0km以上深度的速度图像.结果表明:震区地壳内 8km以上速度结构横向非均匀性较强,反映了该区厚达数公里的沉积盖层介质特征;1 2～ 1 8km深度速度成像存在北东和北西的低速异常带,它们相交于极震区下方,反映了区域发震构造特征;沿极震区的东西和南北正交方向以及强震群分布的两侧,地壳结构均有明显差异,这是强震群孕育的构造背景 相似文献
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异常Q波鉴别的临床价值 总被引：1，自引：0，他引：1
众所周知 ,异常 Q波是心肌梗塞患者典型心电图表现之一 ,但是心电图上所显示的异常 Q波决非均由心肌梗塞所致 ,有很多情况可形成非梗塞性 Q波 ,我院从 1 993年以来发现 1 1 5例 (见下表 )。异常 Q波 115例的分布病种例数 n 男女占 %肺 气 肿 4 5 4 0 5 3 9.1严重心肌缺血 3 0 19112 6.1心 肌 病 15 9613 .0预激症候群 12 5 7 10 .4高 血 钾 85 3 7.0肺 栓 塞 5 4 14 .41 肺栓塞可发生胸骨后闷痛、低血压、呼吸困难 , 、av F导联可出现异常 Q波 ,V1～ 4导联可出现 ST- T改变 ,这些改变常易使人误诊为急性膈面和前间隔心肌梗塞。… 相似文献
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通过实验数据求松弛时间谱的近似方法,采用稳态应力松弛实验或动态剪切实验求得稳态松弛模量函数G（t）或动态模量函数G′（ω）、G″（ω）,由这些函数求取松弛时间谱H（λ）的各次近似解。通过动态线性小振幅剪切震荡实验所得的熔体储能模量G′（ω）和耗能模量G″（ω）数据,根据Schwarzl和staverman提出的近似公式,计算得到离散松弛时间谱,提出了计算参数和温度对离散松弛时间谱的影响。 相似文献
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本文利用相空间重构技术和混沌理论讨论了开都河日径流的混沌性质。通过日径流时间序列的功率谱分析,从定性角度讨论了日径流时间序列的混沌特征。进一步根据互信息量法得到相空间重构的延时,再根据Cao方法得到相空间重构的嵌入维数。利用Matlab软件计算得到相空间重构的延时和最佳嵌入维数分别为τ=6,m=14。这样将一维的开都河日径流时间序列重构成14维的相空间。通过最小数据量法计算出开都河日径流时间序列最大Lyapunov指数。利用最大Lyapunov指数对开都河日径流时间序列进行定量混沌分析。最后通过二阶Volterra自适应一步模型进行模拟。结果表明：开都河日径流时间序列的功率谱是连续的,功率谱呈现随频率增高而以指数方式递减趋势,区别于具有离散尖峰谱特征的周期时间序列和具有连续的、频率和振幅不相关谱特征的随机时间序列。这从定性角度表明开都河日径流时间序列具有混沌特征。通过计算得到开都河日径流时间序列的最大Lyapunov指数0〈λmax=0.0097〈1,从定量角度表明开都河日径流时间序列具有较弱的混沌特征。利用二阶Volterra自适应一步模型模拟得到相关系数和相对均方根误差分别0.9376和0.2390。这说明利用Volterra自适应模型模拟效果较好。 相似文献
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苏刚 《中国科学院研究生院学报》2000,(2)
严格证明了在任何非零温度下一维和二维窄带 (包括次近邻跳跃等 )t J模型不会呈现出S波最近邻配对、推广的 η配对、广义的离位Q配对和dx2 - y2 波配对的超导长程序 .如果在系统的电荷激发谱中存在一个激发能隙 ,则这些配对长程序在零温下也会被排除掉 .我们的结果对任意的J值和任意电子填充都成立 . 相似文献
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"云娜"台风暴雨的Q矢量与螺旋度诊断分析 总被引：5，自引：0，他引：5
利用非地转ω方程说明了Q矢量散度的物理意义,并通过计算台风“云娜”影响过程中的Q矢量散度和高低空螺旋度,分析了这两个物理量的演变特征及其与台风、台风暴雨的关系,指出低层等压面上Q矢量散度场及相对螺旋度对台风暴雨预报具有较好的参考价值。 相似文献
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三维Q值层析成像研究 总被引：2，自引：0，他引：2
给出一种三维Q值成像方法和计算流程。模型的参数化采用矩形网格形式,计算中对射线路径的求解采用三维有限差分,反演方程的求解利用反投影法。数值模拟表明了方法的可行性,用于实测资料处理,得到了有意义的结果 相似文献
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在三维地震资料处理中,由于中心点-偏移距-方位角空间分布不规则使得偏移结果存在成像假象,这中假象会影响到AVO分析的可行性。针对这种现象,本文对叠前数据进行振幅加权再进行叠前偏移,该方法在实际资料的应用,得到的资料更能体现含油储层振幅随偏移距增大而增大的AVO特征。 相似文献
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发酵法生产辅酶Q10的含量分析及工艺优化 总被引：1，自引：0，他引：1
采用分光光度法测定辅酶Q10的含量，并比较其不同工艺条件下的含量，得到了较佳的生产工艺条件，提高了辅酶Q10的得率。 相似文献
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为解决社区问答系统中的问题短文本特征词少、描述信息弱的问题,本文利用维基百科进行特征扩展以辅助中文问题短文本分类。首先通过维基百科概念及链接等信息进行词语相关概念集合抽取,并综合利用链接结构和类别体系信息进行概念间相关度计算。然后以相关概念集合为基础进行特征扩展以补充文本特征语义信息。实验结果表明,本文提出的基于特征扩展的短文本分类算法能有效提高问题短文本分类效果。 相似文献
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在施主/受主荧光系统中,荧光猝灭可用于研究光致电子的转移。当样品中各组分的吸收谱及相应荧光谱存在严重交迭时,荧光检测不可避免地会受到内滤效应及荧光材料吸收深度的影响,造成猝灭率虚高的赝象。本文就三聚噻吩/富勒烯混合液的光谱校正进行研究,以便于正确评估施主与受主材料间的光致电子转移。 相似文献
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Dina M. Abo-Elmatty Ehsan A. Badawy Jihan S. Hussein Somaya Abo Elela Hoda A. Megahed 《Indian journal of clinical biochemistry : IJCB》2012,27(4):379-384
The objective of this study to evaluate heme oxygenase (COHb), leptin and coenzyme Q10 (CoQ10) in pre-eclamptic women. Also Zinc, copper, Iron, total iron binding capacity, Ferritin and uric acid were assessed. 120 female subjects were included in this study. They were divided into, 60 female with normal pregnancy attending the outpatient clinic, 60 pre-eclamptic patients were recruited from obstetrics and gynaecology department El-kasr El-Aini hospital. The results showed that in pre-eclampatic group, leptin level was significantly increased while COHb and CoQ10 was significantly decreased. It is concluded that hemeoxygenase, leptin and coenzyme CoQ10 can be considered as new markers for prediction of pre-eclampsia. 相似文献
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本文测量了人的血清，血液，红血球溶液等多种样品的Ａｒ＋激光诱导的荧光光谱，指出在人体动脉的ＬＩＦ光谱中，红血球对荧光的吸收作用，在５００－７００ｎｍ波段，这种吸收是不均匀的，且在５４７，５８１ｎｍ处有最大的吸收，实验由计算机控制并进行采样和数据处理。 相似文献
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A. S. Thakur G. P. Littaru S. Moesgaard C. Dan sindberg Y. Khan C. M. Singh 《Indian journal of clinical biochemistry : IJCB》2013,28(2):185-188
The study has been undertaken as number of sickle cell patients in Chhattisgarh tribal population is 23.7 %. The Co enzyme Q10 is a strong antioxidant and energy producing compound. The patients were divided into three groups group A homozygous (SS), group B heterozygous (AS) and group C controls for TBARS study. The age group is 10–55 years and 200 mg of CoQ10 was given to A and B groups. The hematological parameters, C reactive protein as well as RBC TBARS level were performed by usual and standard techniques. The results were obtained as 25.37 % increased RBC level in group A and 23.24 % in group B. The increased hemoglobin level was observed as 16.73 % in group A and 10.7 % in group B. In case of WBC it was observed increased 24.38 % in group A and 12.0 % in group B. C-reactive protein was observed 7.8 times decreased in group A and 1.54 times in group B. The RBC TBARS level was also found decreased 48 % in group A and 51 % in group B as compared to group C. During the supplementation of coenzyme Q10 the pain caused by vaso-occlusive events has reduced. This significant increase in hematological parameters as well as decreased C-reactive protein and TBARS level suggest that the Q10 should be included in the diet of sickle cell patients. 相似文献
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向秋云 《中国科学院研究生院学报》1987,25(2):125-131
Cornus L. s. 1. is a large polytypic genus. The classificantion of which has been
so different that some authors recognize several separate genera, while others treat them as ei-
ther subgenera or sections. New evidence from many disciplines such as palynology, cyto-
logy, wood anatomy and embryology supports the view that the genus should remain in the
broad sense. I basically agree with the treatment by Ferguson (1966b) before my finishing
a comprehensive study on Cornus L. s. 1. except for supporting the separation of subgenus
Afrocrania as an independent genus. A new subgenus Sinocornus Q. Y. Xiang, containing
one species, C. chinensis Wangerin, is established here on account of its inflorescence axillary
and different from the other members of the genus which all have terminal inflorescences only.
The inflorescence developed from a terminal bud implicates the sympodial nature of axis of
stem and the one from an axillary bud the monopodial one. It is reasonable to regard the
character as of subgeneric value. Also a new combination, Cornus subgen. Syncarpea (Na-
kai) Q. Y. Xiang, is proposed here as a substitute for Cornus subgen. Benthamia (C. B. Clar-
ke) Schneider used for a long time. Because the valid publication of the former name subgen.
Syncarpea Nakai is earlier than the latter one. The types of inflorescences of 8 subgenera re-
presented by type or selected species are illustrated. 相似文献
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Eefje Cuppen 《Research Policy》2012,41(3):624-637
Dealing with unstructured issues, such as the transition to a sustainable energy system, requires stakeholder participation. A stakeholder dialogue should enhance learning about a problem and its potential solutions. However, not in any form will a stakeholder dialogue be effective. Part and parcel to the development of methodologies for stakeholder dialogue is the evaluation of those methodologies. The aim of this paper is to show how a methodology for stakeholder dialogue can be evaluated in terms of learning. This paper suggests three criteria for the evaluation of learning in stakeholder dialogue: (1) an operationalizable definition of the desired effect of dialogue, (2) the inclusion of a reference situation or control condition, and (3) the use of congruent and replicable evaluation methods. Q methodology was used in a quasi-experimental design to analyse to what extent learning took place in a stakeholder dialogue on energy options from biomass in the Netherlands. It is concluded that the dialogue had a significant effect: the dialogue increased participants’ understanding of the diversity of perspectives. This effect is traced back to particular methodological and design elements in the dialogue. 相似文献
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介绍了用户使用网络互动问答平台的特点,提出了基于这些特点的百度互动问答平台在类目设置上存在的问题,并给出了优化分类设置的建议. 相似文献