High-reliability zircon separation for hunting the oldest material on Earth: An automatic zircon separator with image-processing/microtweezers-manipulating system and double-step dating

Despite the recent development in radiometric dating of numerous zircons by LA-ICPMS, mineral separation still remains a major obstacle, particularly in the search for the oldest material on Earth. To improve the efficiency in zircon separation by an order of magnitude, we have designed/developed a new machine-an automatic zircon separator(AZS). This is designed particularly for automatic pick-up of100 μm-sized zircon grains out of a heavy mineral fraction after conventional separation procedures. The AZS operates in three modes:(1) image processing to choose targeted individual zircon grains out of all heavy minerals spread on a tray,(2) automatic capturing of the individual zircon grains with microtweezers, and(3) placing them one-by-one in a coordinated alignment on a receiving tray. The automatic capturing was designed/created for continuous mineral selecting without human presence for many hours. This software also enables the registration of each separated zircon grain for dating, by recording digital photo-image, optical(color) indices, and coordinates on a receiving tray. We developed two new approaches for the dating; i.e.(1) direct dating of zircons selected by LA-ICPMS without conventional resin-mounting/polishing,(2) high speed U-Pb dating, combined with conventional sample preparation procedures using the new equipment with multiple-ion counting detectors(LA-MIC-ICPMS).With the first approach, Pb-Pb ages obtained from the surface of a mineral were crosschecked with the interior of the same grain after resin-mounting/polishing. With the second approach, the amount of time required for dating one zircon grain is ca. 20 s, and a sample throughput of 150 grains per hour can be achieved with sufficient precision(ca. 0.5%).We tested the practical efficiency of the AZS, by analyzing an Archean Jack Hills conglomerate in Western Australia with the known oldest(4.3 Ga) zircon on Earth. Preliminary results are positive; we were able to obtain more than 194 zircons that are over 4.0 Ga out of ca. 3800 checked grains, and 9 grains were over 4300 Ma with the oldest at 4371 ± 7 Ma. This separation system by AZS, combined with the new approaches, guarantees much higher yield in the hunt for old zircons.     

GeoStar在北京绿化隔离带规划发展信息系统中的应用

概述了北京市区绿化隔离地区规划发展信息系统建设的背景，介绍了系统的总体构成，第一期建设的内容，系统功能模块与实现。通过本 建设，表明国产GIS软件GeoStar在二维矢量，三维表现，DEM，影像以及与MIS结合的综合应用中具有较强的优势。     

在线液 - 液萃取微型万用分相器的设计和应用 Ⅲ.流动注射液液萃取电感耦合等离子体原子发射光谱测定矿石中钼和钨

设计的在线液液萃取分相器及相应流路系统与电感耦合等离子体原子发射光谱联用具有良好的分析性能。用于测定地质样品中的Ｍｏ和Ｗ，检出限（３σ）分别为３６μｇ／Ｌ和２８μｇ／Ｌ，两元素在０～２．０ｍｇ／Ｌ有良好的线性。对于１ｍｇ／Ｌ的Ｍｏ和Ｗ的测定，ＲＳＤ（ｎ＝７）分别为４０％和２７％，测定速率为２５～３０／ｈ。     

使用MAPGIS中的DTM功能处理化探数据

利用MIPGIS中的DTM功能,结合Microsoft Excel处理水系沉积物测量、土壤测量化探数据的方法及成图时注意的一些问题,处理化探数据方法便捷准确。     

在线液-液萃取微型万用分相器的设计和应用 Ⅰ.连续流动萃取石墨炉原子吸收测环境水中镉和不同价态的铬

计了一种用于液＿液萃取，可与各种检测器配合并适用于比重大于或小于水的有机溶剂的微型万用分相器及相应的流路系统。用于与石墨炉原子吸收分光计联用测定环境水中镉和铬，检出限分别为５８ｎｇ／Ｌ和０１７μｇ／Ｌ，精密度（ＲＳＤ，ｎ＝９）分别为５４％和６７％，加标回收率为９２％～１０８％，样品测定速率为３０／ｈ。     

计算的磁拓扑界线与耀斑相关性

本文利用赣榆站所取得的色球精细结构资料，并采用了前苏联强磁场资料，逐日计算了１９９０年１０月１３日至１６日复合活动区ＮＯＡＡ６３０９在色球层的磁拓扑界线，并与色球精细结构资料作了比照，发现：亮谱斑或亮耀斑核均是位于界线上，或紧邻它．这个结果支持“重联是耀斑在释放能量时的主要过程，而重联发生在磁场的拓扑界面上”的观点．     

小型船用油水分离器的设计

介绍ＣＹＦ—０．０５／ＣＹＦ—０．１型油水分离器的主要技术参数、工作原理、设计计算、台架试验。试验表明，经本装置处理后的油污水满足ＧＢ３５５２—８３“船舶污染物排放标准”所规定的排放标准。     

Separation of small nonferrous particles using a two successive steps eddy-current separator with permanent magnets

The paper presents a method for separating the small metallic nonferrous particles from two component metallic nonferrous mixtures using a new type of dynamic eddy-current separator with permanent magnets. The so-called two successive steps eddy-current separator (TSECS) consists of a horizontal rotary drum covered with permanent magnets, alternately N–S and S–N oriented. The separation process takes place in two stages, first the strongly conducting particles are separated on the upper part of the drum, and then the remaining undecided and poorly conducting particles are separated at the lower part of the magnetic drum. The experimental results and comments regarding the values obtained for separation efficiency, grade and recovery for wastes consisting in Cu–Pb and Cu–Al mixtures are given. The obtained results are in good agreement with the theoretical analysis.     

CSR钻探方法在中国矿产勘探中的应用与发展

全面论述了ＣＳＲ钻探方法在中国矿产勘探中的应用与发展过程，同时介绍了实现ＣＳＲ钻探方法国产化时，根据我国情选择和设计钻探设备，钻具以及配套技术工艺等方面所取得的成果和创新。     

一种新型熏力分相器在流动注射液-液萃取原子吸收间接测定硝酸根的应用

本文应用一种新型的四通道重力分相器，通过实验，选定了流动注射液-液萃取原子吸收间接测定硝酸根的最佳化学条件和仪器参数，方法的精密度RSD和检出限分别是为1.85%(0.25mg/L,n=10)和0.0028mg/L，测定速度为25样/h，用本系统测定水样中的硝酸根和亚硝酸根，加标回收率为100%-110%。