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1.
在日照市开展多目标区域地球化学调查,获取了表层土壤和深层土壤地球化学数据,通过对获得的地球化学参数进行统计分析,确定了日照市土壤地球化学基准值和背景值,认为日照市除部分元素或指标外,大部分元素或指标土壤地球化学基准值和背景值与全省土壤地球化学基准值和背景值接近。研究发现,日照市As,Cd,Cr,Cu,Hg,Ni,Pb,Zn等8种重金属元素背景值含量低于国家土壤环境质量标准的土壤一级标准限值,日照市土壤质量基本保持自然背景水平;而受工业化生产和城市化建设等后期人为活动影响,日照市表层土壤中Cd,C,Hg,N,P,S,Se,Corg等元素或指标出现明显富集,应引起重视。 相似文献
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In our previous study (Earthquake Engineering and Structural Dynamics 2003; 32 :2301), we have developed a probabilistic algorithm for active control of structures. In the probabilistic control algorithm, the control force is determined by the probability that the structural energy exceeds a specified target critical energy, and the direction of a control force is determined by the Lyapunov controller design method. In this paper, an experimental verification of the proposed probabilistic control algorithm is presented. A three‐story test structure equipped with an active mass driver (AMD) has been used. The effectiveness of the control algorithm has been examined by exciting the test structure using a sinusoidal signal, a scaled El Centro earthquake and a broadband Gaussian white noise; and, especially, experiments on control have been performed under different conditions to that of system identification in order to prove the stability and robustness of the proposed control algorithm. The experimental results indicate that the probabilistic control algorithm can achieve a significant response reduction under various types of ground excitations even when the modeling error exists. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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The results of X-ray induced photoelectron spectroscopy (XPS) experiments on several phases of the ternary system Tl-Sb-S are reported. The binding energies of the inner S, Sb and Tl electrons increase with increasing quantities of Sb and decreasing amounts of Tl in these compounds. This is explained by the influences of the proportions of the bonded metals on the effective electron affinity of S. The higher proportions of the more electronegative element bonded to S cause the increase of its effective electron affinity. The results for Tl2S (carlinite), Tl3SbS3, TlSbS2 (weissbergite), TlAsS2 (lorandite) and Sb2S3 (antimonite) can be interpreted in this way. The results for Tl4S3 suggest a predominantly covalent character of bonding for both Tl(III) and Tl(I), which are present in this sulfide. From comparison with Tl3SbS4 it could be supposed that Tl(III)-S bond has a more covalent character than Sb(V)-S bond. The results for Tl3SbS4 are in agreement with crystal structure data and the results of Moessbauer spectroscopy. For AsS (realgar) the binding energies of the inner electrons of As and S significantly increase, showing that the electrons in molecular orbitals are less strongly bonded to individual atoms, as compared to pure elements. The results for the amorphous TlSb5S8 (corresponding in composition to parapierrotite) suggest that in amorphous compound the Tl-S bonding is stronger and the coordination of Tl more regular than in a crystalline one. 相似文献
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纪宏金 《吉林大学学报(地球科学版)》1991,(3)
根据北瓦地区岩心样品的地球化学数据处理结果,介绍多元正态总体假设检验方法与对应分析相结合在该区铅锌矿化带识别中的应用。从全体数据的对应分析结果出发,将见矿钻孔的样品得分值经稳健处理后作为铅锌矿化带的已知样本,并以马氏距离为统计量对未见矿钻孔的样品进行识别,在一定信度下作出了该区已知铅锌矿化带在深部存在较有意义延伸的统计推断。 相似文献
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We have obtained the temporal correlation function, Q(t), from time sequences of Caii K filtergrams and Dopplergrams from Antarctica, Taiwan Oscillation Network (TON) and Solar and Heliospheric Observatory (SOHO). Q(t) gives the time evolution of the pattern under examination, supergranulation in this case. It has been found that Q(t) shows oscillatory signals of both 5-min and long-term periods. The 5-min oscillations are suppressed by averaging the images over 10 min. An exponential decay curve which represents the lifetime trend of supergranules, is fitted to Q(t) and subtracted out. The Q(t) residuals thus obtained contain the oscillatory component and are then subjected to a periodogram analysis. Significant periodicities in the range of 1.4–10 hours have been noted. The causes of these oscillations are not fully known at present, but the instrumental and atmospheric factors can be ruled out, pointing to solar origin. Various possibilities are discussed. Some of the observed periodicities may be considered as probable candidates for long-term oscillations in the Sun, such as the elusive gravity modes. 相似文献
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济阳坳陷古近系同沉积背斜构造及其与油气的关系 总被引:2,自引:8,他引:2
济阳坳陷由于受到多期构造运动的影响,在前第三系古地形高点背景上广泛发育同沉积背斜构造,然而由于坳陷在断陷期基底滚动式沉降,造成挠曲顶部的塌陷,形成复杂的块断结构,使本区同沉积构造发生强烈改造,往往与各次级断层或沉积地层相复合,表现出独特的构造景观。济阳坳陷发育的同沉积背斜构造可分为同沉积背斜和同沉积鼻状构造,它们在形成和发展中,重力起主导作用,滑塌是主要形式。在与油气成藏关系上,济阳坳陷同沉积背斜构造的形成与发展,对于油气的生成、运移、聚集、储集、保存等都有着至关重要的作用。 相似文献
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平阴县土壤中重金属元素异常成因研究 总被引:1,自引:0,他引:1
通过对平阴县周边及其西部农田区采样调查,平阴县周边元素异常具有异常衬度较高,富集系数大等特征,西部农田区异常具有各元素套合关系好,多数异常衬度不高,富集系数小的特点。结果表明,西部农田区异常是以As,Cd为主要成分的异常,元素含量与SiO2,Al2O3,Fe2O3等常量组分间具有显著的相关性,随SiO2含量的增加而降低,随Al2O3,Fe2O3含量的增加而增加,说明土壤常量组分及其所决定的土壤质地是导致异常形成的主要因素;而平阴城区异常是以S,Hg,As,Zn,Mn等元素为主的异常,是典型的人为综合因素(化工烟尘、工厂污水、生活垃圾)产生的异常。 相似文献
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