超高效液相色谱串联质谱法测定底泥中三唑磷残留量

建立了一种超高效液相色谱串联质谱法测定底泥中三唑磷的分析方法。泥样中加入5 mL蒸馏水混匀、以正己烷提取、氮吹仪浓缩和初始流动相定容后,采用电喷雾正离子(ESI+),多反应监测(MRM)模式监测,外标法定量。结果表明三唑磷在0.5～50.0μg·L~(-1)浓度范围内线性关系良好(R2=0.999 1),方法定量限为0.5μg·kg~(-1)。在2.0、5.0、10.0μg·kg~(-1)添加水平下,三唑磷回收率在94.8%～98.8%,相对标准偏差(RSD,N=3)在0.64%～3.17%之间。本方法对测定泥样中三唑磷含量具有快速、灵敏度高和重现性好,适用于泥样中三唑磷的检测分析。     

食品中6种新型农药的超高效液相色谱-串联质谱法测定

建立了蕃茄、苹果汁、凉茶、米粉、蜂蜜和牛奶中氟虫酰胺、氯虫酰胺、烯啶虫胺、吡虫啉、虫酰肼和抑食肼6种新型农药的UPLC-MS/MS测定方法。蕃茄、凉茶样品用乙腈和乙酸乙酯混合溶剂提取;蜂蜜和米粉样品先用水溶解后再用混合溶剂提取;牛奶样品用乙腈提取;苹果汁样品高速离心后取上层清液。待测液在正离子模式下用电喷雾电离-串联质谱仪测定,方法检出限范围为0.01～2μg/kg。在20μg/kg和160μg/kg 2个质量分数水平进行加标回收实验,平均回收率在68.4%～129%之间。方法准确、高效,适合该6种食品基质中6种农药残留的测定。     

液相色谱-串联质谱法测定蜂蜜中9种青霉素

建立了用液相色谱-串联质谱(LC-MS-MS)测定蜂蜜中9种青霉素残留量的分析方法.3g蜂蜜样品用25mL pH=8.5的0.15mol/L磷酸二氢钠缓冲溶液溶解,用Oasis HLB固相萃取柱净化,目标物用乙腈-水(体积比1∶1)洗脱,定容收集液至3mL.采用电喷雾电离,正离子扫描,多反应监测(MRM)模式检测.0.5,1.0,2.0,5.0μg/kg 4个添加水平的回收率为76.9%～104.3%;相对标准偏差为3.29%～9.12%;方法定量限是:青霉素G、乙氧萘青霉素为0.5μg/kg,氧哌嗪青霉素、青霉素V、苯唑青霉素为1.0μg/kg,羟氨苄青霉素、氨苄青霉素、邻氯青霉素、双氯青霉素为2.0μg/kg.     

香蕉中丙环唑残留的分析方法研究

采用乙腈提取香蕉中的丙环唑的农药残留,用SPE弗罗里硅柱净化,气相色谱法(μ-ECD检测器)进行测定.该方法的线性相关系数为0.9994.回收率在92.4～112.8%之间,变异系数1.3～11.7%。果皮和果肉丙环唑的最低检出限为0.01mg/kg.     

SPE-UPLC-MS/MS快速测定豆制品中的乌洛托品

建立了一种固相萃取-超高效液相色谱质谱联用(SPE-UPLC-MS/MS)测定豆制品中乌洛托品的分析方法。样品经粉碎后,采用乙腈提取,ProElut PXA小柱净化,Shim-pack XR-ODS色谱柱分离,在电喷雾正离子模式下用质谱仪进行MRM分析。结果表明:乌洛托品在0～160μg/kg范围内呈现良好的线性关系,线性相关系数为0.9998,该方法对应的检出限和定量限分别为0.3μg/kg和1μg/kg在5～100μg/kg添加水平下,乌洛托品回收率为88.4%～97.1%,相对标准偏差为5.39%～8.74%。该方法简便,快速,可成功应用于豆制品中乌洛托品的检测。     

蜂蜜中多种有机磷农药残留的液相色谱串联质谱检测

针对敌百虫、敌敌畏和蝇毒磷为常用的防治蜜蜂天敌或虫害的有机磷农药杀虫剂,易在蜂蜜中产生残留,建立了蜂蜜中敌百虫、敌敌畏和蝇毒磷残留的液相色谱串联质谱(LC-MS/MS)同时测定方法。蜂蜜样品经乙酸乙酯提取、浓缩,用甲醇溶解残渣,液相色谱(LC)分离,电喷雾(ESI)-MS/MS多反应监测(MRM)模式检测,外标基体曲线定量。3种有机磷农药在20～500μg/L范围内线性响应良好,相关系数均大于0.994;获得的检出限均为0.1μg/kg,定量限均为4μg/kg。在加标浓度为10～40μg/kg范围内,平均回收率为78.5%～96.8%,相对标准偏差为9.1%～13.1%。     

离子液体分散液液微萃取-高效液相色谱分析苹果中有机磷农药残留

建立了苹果中有机磷农药残留多组分同时定量分析的离子液体分散液液微萃取-高效液相色谱分析(IL-DLLME-HPLC)方法.以[C_6MIM][PF_6]离子液体为萃取剂,甲醇为分散剂,对样品体积、萃取温度和萃取时间等萃取条件进行优化.结果显示,苹果样品中哒嗪硫磷、对硫磷、倍硫磷和伏杀硫磷4种有机磷在20～2 000μg/kg范围内线性关系良好,检出限为5.7～8.4μg/kg,加标回收率在85.3%～101.1%范围内,富集倍数为246～273.该方法回收率和富集倍数高,适用于苹果中有机磷农药残留的多组分同时分析.     

超声提取-液相色谱质谱法同时测定辣椒制品中5种非法添加染料

建立超声提取-液相色谱质谱法同时测定苏丹红Ⅰ、苏丹红Ⅱ、苏丹红Ⅲ、苏丹红Ⅳ以及罗丹明B五种食品非法添加染料的方法。辣椒制品以正己烷为提取溶剂,超声波提取15min,乙腈饱和正己烷溶液去油脂,乙腈定容。采用LC-MS/MS正离子扫描测定食品非法添加物罗丹明B和4种苏丹红。标准加标回收试验,罗丹明B添加浓度分别为2,4,8μg/kg,苏丹红Ⅰ～Ⅳ添加浓度为:10,20,30μg/kg,平均回收率为90.3%～94.3%,相对标准偏差(RSD)2.0%～4.9%。本方法5种非法添加染料的检出限罗丹明B为1μg/kg,苏丹红Ⅰ～Ⅳ检出限均为5μg/kg。该方法简便、快捷、大大降低了前处理时间,适合进行批量样品的测定。     

加速溶剂萃取一气相色谱法分析土壤中七种菊酯类农药

研究采用加速溶剂萃取测定土壤中七种菊酯类农药残留的方法:土壤样品与氟罗里硅土按适当比例混合,用正己烷和丙酮(1∶1,v/V)混合溶剂作为提取剂,萃取温度80℃,压力l0MPa。加速溶剂萃取8min,样品经提取浓缩后,采用DB一1701石英毛细管柱(30m×320μm×0.25μm)分离,ECD检测,外标法定量。土壤中七种菊酯类农药的回收率为92.0%～100.5%,RSD为2.43%～5.05%。检出限0.6～1.4μg/kg,该方法简单、快捷、实用。适合土壤中菊酯类农药测定方法的推广。     

液—质联用测定土壤中唑嘧磺草胺的残留量

为了准确的分析土壤中痕量的唑嘧磺草胺,建立了液相色谱-串联质谱分析方法。使用乙腈-1%甲酸水溶液(V/V=55∶5),经超声10 min、静置的方法对3种土壤的唑嘧磺草胺进行提取,并经LC-MS/MS分析。结果显示,唑嘧磺草胺在0.05~5.0μg/L的质量浓度范围内具有良好的线性关系,回归方程y=1024.1x+19.996;r=0.9988。在添加浓度为1.0μg/kg、10.0μg/kg时,该方法可有效对红土、水稻土中唑嘧磺草胺进行分析,经提取方法优化后适用于潮土的唑嘧磺草胺残留分析。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to