海相油页岩的生烃动力学特征——以燕山地区下马岭组油页岩为例

油页岩是未来重要的补充与替代能源。通过开放体系程序升温热模拟实验,对燕山地区下马岭组海相油页岩进行了研究。结果表明:其热裂解反应主要发生在440～480℃,表观生烃活化能集中分布于170～290 kJ/mol,主峰约为240 kJ/mol,明显高于陆相油页岩(抚顺油页岩和茂名油页岩),而与下古生界海相烃源岩(甘肃平凉奥陶系灰岩及爱沙尼亚奥陶系Kukersite油页岩)活化能分布范围及主峰位置相似。以ICP技术规范为例,在相同热历史条件下,通过数值模拟认识到下马岭组海相油页岩主生烃温度为275～325℃,高于湖相油页岩(265～305℃),而与下古生界海相烃源岩相似,表明其可能具有与古生界海相有机质相似的生烃机理。     

中国地质学会期刊处成绩优异

<正>中国地质学会期刊处,主要负责《地质学报》(中、英文版)和《地质论评》三刊的编辑、出版工作,兼顾中国地质学会对地质学期刊的管理。在中国地质学会理事会和中国地质科学院的领导下,在朱立新秘书长的具体组织下,在《地质学报》(中、英文版),《地质论评》等期刊主编、副主编和编委的大力支持下,中国地质学会期刊处,在大力实施科技期刊精品化、电子化、网络化、国际化等战略中,取得了杰出的成就,得到了中国科协和广大读者、作者的广泛赞誉。     

Multi-collector ICP-MS Analysis of Pb Isotope Ratios in Rocks: Data, Procedure and Caution

The authors measured Pb isotope compositions of seven USGS rock reference standards, i.e. AGV-1, AGV-2, BHVO-1, BHVO-2, BCR-2, BER-1/1 and W-2, together with NBS 981 using a micromass isoprobe multi-collector inductively-coupled plasma mass spectrometer (MC-ICP-MS) at the University of Queensland. 203Tl-205Tl isotopes were used as an internal standard to correct for mass-dependant isotopic fractionation. The results for both NBS 981 and USGS rock standards AGV-1 and BHVO-1 are comparable to or better than double- and triple-spike TIMS (thermal ionization mass spectrometry) data in precision. The data for BHVO-2 and, to a lesser extent, AGV-2 and BCR-2 are reproducibly higher for 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb than double-spike TIMS data in the literature. The authors also obtained the Pb isotope data for BIR-1/1 and W-2, which may be used as reference values in future studies. It is found that linear correction for Pb isotopic fractionation is adequate with the results identical to those corre     

IEEE-488与非标准仪器接口连接

IEEE—488接口总线,是计算机与外部设备、仪器连接的通用标准并行接口,它要求被连接的仪器具有EEEE—488标准的接口。本文讨论,如何把它与非IEEE—488标准的仪器接口相连接。 首先,要研究非标准的仪器接口,找出它与IEEE—488标准的异同。必要时,应改焊此仪器的接口插头线端,使那些主要信号线功能与IEEE—488要求一致的线端处于与IEEE—488插口线端对应的位置,而功能不相容者不用。然后,试运行IEEE—488接口卡上EPROM中已有程序。必要时,应把三线联络方式改为西线、一线或零钱联络,并根据卡上I/O芯片功能自编连接子程序。这对所用IEEE—488接口卡的功能是一种扩充。 本文具体介绍了用此方法如何将TCH—瞬态仪与APPLEⅡIEEE—488接口卡连接,构成一个较强功能的高速瞬态信号采集与处理系统。     

小波神经网络研究进展及展望

关于小波分析与人工神经网络结合的研究,近些年来已成为信号处理学科的热点之一,已有大量的研究成果见诸各种学术刊物和会议论文。小波变换具有良好的时频局部性质,神经网络则具有自学习功能和良好的容错能力,小波神经网络（ＷＮＮ）由于较好地结合了两者的优点而具有强大的优势。作者较系统地综述了小波神经网络的研究进展,讨论了小波神经网络的主要模型和算法,并就其存在的一些问题,应用与发展趋势进行了探讨     

Test Study on Erosion and Siltation Patterns of Sandy Bottom Before Mound Breakwater Under the Effect of Waves

In this paper, the effect of waves on erosion of the sandy bottom before mound breakwaters is studied. The sandy bottom basically presents two erosion patterns, between which there is a transitional state, under the action of partially standing waves. The two erosion patterns can be determined by dimensionless parameter Us, defined in this paper. The erosion locations, depths and lengths can be estimated by a series of equations presented in the text. Irregular waves are employed in the test besides regular waves, and the effect of the irregular waves can be estimated by the element of equivalent waves, such as T1/3, H1/3.     

双层BP人工神经网络连接权值的性质

从理论上分析和探讨具有Ｓ型连结函数的双层ＢＰ网络连接权值和阈值的性质，并进行实例验证，本文有助于神经网络内部行为的研究。     

Dynamic Modeling and Three-Dimensional Motion Analysis of Underwater Gliders

For consideration of both the eccentric rotatable rigid body and the translational rigid body, the dynamic model of the underwater glider is derived. Dynamical behaviors are also studied based on the model and can be used as the guidance to underwater gliders design. Gibbs function of the underwater glider system is derived first, and then the nonlinear dynamic model is obtained by use of Appell equations. The relationships between dynamic behaviors and design parameters are studied by solving the dynamic m...     

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1　《山西地震》是地震科技季刊 ,以刊登地震监测、预报、科研、工程地震、地震社会学等方面的成果以及防震减灾知识为主 ,亦刊登国内外地震科技情报资料等。辟有地震预报、观测分析、工程抗震、异常识别、地震社会学、技术革新、技术交流、综合评述、科研简讯、学术动态、问题讨论、外文译摘、外语阅读之窗、专题汇编、新技术讲座、科普园地、资料等栏目。2　稿件文字力求言简意赅 ,引用数据、公式应准确 ,文稿字数以 3 0 0 0～ 5 0 0 0字为妥 ,文稿前请附中、英文题名、作者、单位 ,邮政编码 ,2 0 0字左右的摘要 (中文摘要请用报道性文摘 …     

海南岛东部黄竹岭地区变质火山岩锆石U-Pb同位素年龄及其地质意义

海南岛东部黄竹岭地区出露一套中浅变质岩系,其中夹变质火山岩。变质火山岩中存在2组不同成因的锆石,获颗粒锆石U-Pb一致曲线上交点年龄为527Ma±48Ma,可解释为火山岩生成年龄的下限,下交点年龄为230Ma±13Ma,为岩石后期经受变质热事件的年龄。据上述颗粒锆石U-Pb年龄,结合区域地质背景分析,认为变质火山岩的形成年龄介于498.9～(527±48)Ma之间,该套地层形成时代为早古生代。