K-Ar age of young volcanic rocks and excess argon——Binary mixing model and quantitative study of excess argon effect

A binary mixing model for excess argon is suggested in the note. According to this model and the data of excess argon component obtained in our experiment, a quantitative study of the effect of excess argon on real K-Ar age of young volcanic rocks is done. The result indicates that the effect of 5% excess argon component in samples on K-Ar age of the samples more than 2 Ma is less than 7.36% and can lead K-Ar age of 0.5 Ma samples to increase by 32.4%, while 1% excess argon component leads K-Ar age of 0.5 Ma samples to increase by 6.26%. Therefore, when pre-processed excess argon component is ⩽ 1%, K-Ar age of the samples more than 0.5 Ma should be credible. On this basis we suggest a principal opinion for evaluation of previous K-Ar dating results and propose that the matrix is used to determine K-Ar age of young volcanic rocks. For the samples less than 0.2 Ma, in the case of high excess argon content, even if only 1% excess argon component exists in their matrix, it can also greatly affect their K-A age. Thus it must be careful to treat the dating result.     

High-resolution sedimentary records of heavy metals in Guangzhou section of the Pearl River, South China

The sedimentary feature and variation of heavy metals in ca. 100 years, especially in the last three decades, in the riverbed of Guangzhou section of the Pearl River were revealed by the sedimentary heavy metal fluxes and total organic carbon (TOC) in a 210Pb-dated sedimentary core. It is suggested that the historical changes of heavy metal contamination can be recorded by pollutant sedimentary fluxes rather than by their concentrations. The heavy metal contamination in the river section was divided into 6 sedimentary historical stages of 3 groups, which correspond to the economic development and regional urbanization process.     

CDMA2000网络A1接口BSAP协议监测技术的研究与应用

以CDMA2000网络A1接口BSAP(base station application part)协议监测关键技术研究与应用为切入点.以如何实现对CDMA2000网络进行实时、高效、可靠监测为研究重点.针对国内外现有网络协议监测技术协议解码、CDR合成研究方案时效性的不足,从协议解码算法流程设计、CDR(call data record)合成算法原理及算法效率(时间复杂度)来进行对比验证分析,并以此为突破口,设计了BSAP协议监测模块的实现方案.研究成果将可对同网络其他协议及接口监测方案提供参考,其研究和实现的内容可应用于网络监测系统、监测仪表中,能为现网的监测、运营商的运维提供可靠技术支撑.     

电容器组中熔断器非短路开断的电气特性

外熔断器是直接与电容器串联的保护器件,实际运行中,熔断器自身的非短路开断是电容器组附件中故障率最高的.目前广泛应用于电力系统的并联电容器组普遍采用分体框架式结构,由多台电容器联接成双星形后再接入电力系统.文中分析了开断过程的电气特性,推导了开断时的等效电气模型,得到了故障过程中电容器组的各支路电压及电流的相位规律,利用并联电容器组实时监测装置的故障记录数据验证了分析的正确性,并提出了降低熔断器引起电容器组故障率的建议.     

中国大陆巨须隐翅虫属一新记录（鞘翅目：隐翅虫科，巨须隐翅虫亚科）

报道了巨须隐翅虫属中国大陆一新记录种,研究标本保存在云南省林业技术学院．     

Records of volcanic events since AD 1800 in the East Rongbuk ice core from Mt. Qomolangma

Continuous Bi profile of the East Rongbuk (ER) ice core near Mt. Qomolangma reveals nine major volcanic events since AD 1800. Compared with Volcanic Explosivity Index (VEI), it shows that the concentrations of Bi in the ER ice core can reflect the major volcanic events within the key areas. This provides a good horizon layer for ice core dating, as well as a basis for reconstructing a long sequence of volcanic records from the Qinghai-Xizang (Tibet) Plateau ice cores. Supported jointly by National Basic Research Program of China (Grant No. 2007CB411501), National Natural Science Foundation of China (Grant No. 90411003), Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX3-SW-344) and Hundred Talents Project of the Chinese Academy of Sciences     

案例检索及权重优化方法研究及应用

案例检索是基于案例推理(CBR)系统的中心环节,检索速度和精度关系着整个系统的质量.文章系统地提出了一套案例检索及其权重优化方法(FRAWO),重点研究了用基于梯形的模糊集和改进的欧氏距离检索算法分别解决案例中模糊概念属性、区间特征属性的相似度计算问题以及采用PULL&PUSH调整策略进行案例权重的调整.在实验系统上基于案例库对FRAWO法的有效性、准确度、效率等进行了实验.实验结果表明,FRAWO法适用于CBR系统,检索速度较快、准确性高.     

台湾平腹蛛科(蛛形纲:蜘蛛目)3新种2新纪录种

报道产于台湾的平腹蛛科3新种(台湾希托蛛Hitobia taiwanica sp.nov.,叉狂蛛Zelotes bi-furcutis sp.nov.和扇狂蛛Z.flabellis sp.nov.)及2新纪录种(金比罗平腹蛛Gnaphosa kompirenensis Boesenberg et Strand,1906和廖氏狂蛛Zelotes liaoi Platnick et Song,1986).附有详细的新种外形描述和特征图.     

哈拉阿拉特山石炭系裂缝发育特征及成藏意义

哈拉阿拉特山地区位于准噶尔盆地西北缘前陆褶皱冲断带,紧邻玛湖生烃凹陷,是油气运移和聚集的有利区
域。针对该区石炭系油气藏主要赋存于火山岩构造裂缝中且富集规律不清楚的问题,开展了构造裂缝的发育特征、控
制因素及其与油气成藏的关系研究。利用钻井岩芯、成像测井、岩石力学实验及流体包裹体分析等手段,研究了石炭
系火山岩构造裂缝的产状、密度、发育次序、主控因素及其与油气成藏关系。结果表明,石炭系火山岩裂缝主要为高角
度裂缝,裂缝发育的优势倾向为北西-南东向,影响裂缝发育的主控因素为岩石力学性质及所处的构造位置。同时,
由于高角度缝充填程度低、形成时间晚、发育程度高,且与油气主要的运移成藏期匹配较好,因而成为研究区石炭系油
气主要勘探目标。该研究结果对于哈拉阿拉特山地区石炭系火山岩油气藏的勘探与开发具有重要的指导意义。     

内蒙古西乌旗地区二叠纪双峰式火山岩的年代学、地球化学特征和地质意义

为了加深对中亚造山带东段晚古生代构造背景的认识, 选取内蒙古西乌旗地区二叠纪火山岩进行年代学和地球化学研究。分别利用X光荧光光谱(XRF)、SHRIMP锆石U-Pb测年、ICP-MS和ISOPROBE-T方法测定研究区火山岩的主量元素含量、年龄、微量元素和稀土元素含量及Sr-Nd同位素。结果表明, 这套火山岩的SiO₂含量集中分布在53.54%~54.71%和72.61%~80.81%两个区间, 分别属于玄武安山岩和流纹岩, 构成双峰式火山岩组合。流纹岩SHRIMP锆石U-Pb年龄为279 ± 4.3 Ma, 说明它喷发于早二叠世。玄武安山岩轻稀土略富集而重稀土略亏损, (La/Yb)_N为2.06~2.34, 有轻微的Eu负异常, 富集大离子亲石元素和高场强元素, Nb, Ta和Sr有明显的负异常, 推断其来源于深部非原始地幔, 很大程度上受地壳成分的混染。流纹岩亦略富集轻稀土, 略亏损重稀土, (La/Yb)_N为1.70~3.81, 有很强的Eu负异常, Sr, P和Ti相对强烈亏损, Nb和Ta轻度亏损, K, Zr和Hf相对富集, 具有较高的正ε_Nd(t)值(+3.98~+5.62)和年轻的模式年龄T_DM(490~690 Ma), 具有A型花岗岩的特征, 推断其为新生陆壳来源。综合地球化学特征、区域地质特征和前人研究资料, 这套双峰式火山岩具有板内成因特征, 形成于碰撞后的伸展环境。