基于金-钯纳米粒子/石墨烯修饰电极测定药剂中的对乙酰氨基酚

利用电化学方法在石墨烯表面上沉积金-钯纳米粒子,制备了金-钯纳米粒子/石墨烯修饰玻碳电极.扫描电子显微镜和X-射线能谱仪对修饰电极组装过程进行了表征.采用循环伏安法研究了对乙酰氨基酚在修饰电极上的电化学行为,在p H 7.0的磷酸盐缓冲溶液中,对乙酰氨基酚在修饰电极上出现一对明显的氧化还原峰,其氧化还原峰电位分别为0.334V和0.299V.在最佳条件下,对乙酰氨基酚的氧化峰电流与其浓度在5.0×10-7-1.0×10-4mol/L范围内呈良好的线性关系,检出限(S/N=3)为1.0×10-7mol/L.利用该方法对药片中的对乙酰氨基酚含量进行检测,获得的结果令人满意.     

氧化石墨烯-硫堇及纳米金修饰玻碳电极电流型葡萄糖生物传感器的研究

以玻碳电极为基底,在电极表面修饰一层氧化石墨烯-硫堇(GO -Th)薄膜,通过层层自组装方式,将纳米金和葡萄糖氧化酶(GOD)固定在玻碳电极表面,制得一种新型电流型葡萄糖生物传感器.在优化的实验条件下,该生物传感器对葡萄糖的线性响应范围为1.0×10-9 ～5.7×10-5 mol·L-1,检测下限为5.0×10-10...     

基于离子液体功能化碳纳米管负载金-铂纳米粒子的过氧化氢传感器

采用电化学沉积法将金-铂纳米粒子(Au-PtNPs)负载到离子液体功能化的碳纳米管(MWCNTs-IL)表面,构建了一种新型的过氧化氢(H2O2)传感器,采用循环伏安法(CV)、电化学阻抗法(EIS)对修饰电极进行表征.结果表明,电极表面双金属纳米粒子的存在极大地提高了电极的电化学性能,在最优实验条件下,过氧化氢的浓度与电流在1.0×10-9~1.2×10-7 mol·L-1范围内呈现良好的线性关系,检出限为4×10-10 mol·L-1.     

纳米金修饰电极和探针载体的DNA电化学发光分析方法研究

提出以纳米金修饰电极和以纳米金粒子作DNA探针载体的电化学发光检测DNA新方法.首先将纳米金自组装在金电极上,再将含巯基的目标ss-DNA固定于纳米金修饰的电极上,然后与以纳米金粒子作载体的电化学发光DNA探针进行杂交反应,将此电极做工作电极,在含有三丙胺的溶液中进行电化学发光测量.在选定实验条件下,检测囊肿纤维DNA片断(20 base)的线性范围为1.0×10-12~1.0×10-9mol/L,相关系数为0.9954,检出限为5.0×10-13mol/L.实验结果表明,纳米金具有较大的比表面积,可增强DNA在电极上的固定量,从而增强电化学发光检测信号,提高方法的灵敏度.     

阿魏酸在纳米金/石墨烯修饰电极上的电化学行为及其测定

采用电化学还原法制备纳米金/石墨烯修饰玻碳电极,研究了阿魏酸在该电极上的电化学行为,建立了其含量测定的电化学方法.实验结果表明:纳米金/石墨烯修饰电极对阿魏酸的电化学响应具有明显的催化活性.在最优实验条件下,阿魏酸的浓度在5.0×10~(-3)~4.0mg·L~(-1)范围内与其氧化峰电流呈良好线性关系,最低检测限为2.0×10~(-3) mg·L~(-1).该修饰电极具有良好的重复性、稳定性和抗干扰性,可用于阿魏酸哌嗪片中阿魏酸含量的测定.     

石墨烯/铜-银合金复合膜修饰玻碳电极同时测定鸟嘌呤和腺嘌呤

采用简单的搅拌还原法制备了石墨烯/铜-银合金纳米复合物,基于该复合物修饰玻碳电极制备了新型的电化学传感器.用SEM和TEM扫描电镜对石墨烯和石墨烯/铜-银合金纳米复合物进行了表征.分别用循环伏安法和差分脉冲伏安法研究了鸟嘌呤和腺嘌呤在修饰电极上的电化学行为.结果表明,石墨烯/铜-银合金纳米复合膜显著促进了鸟嘌呤和腺嘌呤在电极上的电子传递速度.在0.1 mol/L醋酸盐缓冲溶液(ABS)中(pH 4.5),鸟嘌呤和腺嘌呤在该修饰电极上具有良好的电化学行为,鸟嘌呤和腺嘌呤分别在1.0¹00.0μmol/L浓度范围内,信号线性关系良好,相关系数分别为0.997和0.998.鸟嘌呤和腺嘌呤的检出限分别为6.0×10-8mol/L和5.0×10-8mol/L(S/N=3).将该传感器用于DNA样品中嘌呤碱基分析,得到(G+C)/(A+T)的比值为0.79.     

纳米金/还原氧化石墨烯修饰的盐酸环丙沙星分子印迹电化学传感器

以吡咯和邻苯二胺为功能单体,以盐酸环丙沙星为模板,在纳米金和还原氧化石墨烯(AuNP/rGO)修饰的玻碳电极上,采用电化学方法制备分子印迹聚合物薄膜电化学传感器.利用扫描电镜对修饰电极表面形貌进行表征;电化学技术测试分子印迹传感器性能.研究了纳米金和还原氧化石墨烯用量对电极电化学性能的影响,并对传感器制备和测试条件进行了优化.在优化条件下,分子印迹传感器对盐酸环丙沙星具有宽的线性检测范围(1.0×10^-8～1.0×10^-2 mol/L),低检测限(7.41×10^-12 mol/L(S/N=3)),选择性高,稳定性好.此外,该传感器成功检测出了实际药品和牛奶样品中的盐酸环丙沙星.     

基于网状硒化钼和杂交链式反应高灵敏检测DNA

用水热法合成了网状硒化钼纳米,将其和纳米金修饰于玻碳电极表面,固定上DNA探针后结合杂交链式反应构建了一种新型信号放大型电化学传感器,用于特定DNA序列的超灵敏检测.硒化钼纳米片具有好的导电性能和大的比表面积,结合杂交链式反应的信号放大作用,可显著提高检测灵敏度.用于DNA检测,其线性范围为1.0×10-10~1.0×10-14mol/L,信噪比等于3时,检出限为8×10-15mol/L.该传感器可区分三碱基错配的DNA和单碱基错配的DNA,具有较高的选择性.     

基于酪氨酸酶/离子液体-石墨烯纳米复合界面的双酚A电化学传感器

以1,3-二(4-氨基-吡啶)丙烷四氟硼酸盐离子液体修饰石墨烯纳米复合物,负载酪氨酸酶至玻碳电极表面构建双酚A电化学传感器.优化了滴涂量、检测电位、pH值等实验条件对传感器响应性能的影响.结果表明,传感器的安培响应电流与双酚A浓度在1.0×10-9~3.8×10-5 mol/L范围内具有良好的线性关系,检出限为3.5×10-10 mol/L(RSN=3).用于矿泉水瓶中溶出双酚A含量测定,结果与高效液相色谱一致.     

基于层状二硫化钼-石墨烯构建新型17β-雌二醇电化学生物传感器

合成了层状二硫化钼-石墨烯纳米复合材料.通过将适配体固定在金纳米和二硫化钼-石墨烯共同修饰的电极上构建了一种新型的环境激素17β-雌二醇电化学生物传感器.采用循环伏安、微分脉冲伏安、电化学阻抗等技术对传感器的构筑过程进行表征.对17β-雌二醇与适配体特异性结合的时间及温度进行了优化.结果表明,峰电流与17β-雌二醇浓度在1.0×10-11~1.0×10-8 mol/L范围内呈良好的线性关系.计算得到的检出限为5.0×10-12 mol/L(空白的三倍标准偏差).该生物传感器具有良好的选择性和稳定性.     

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…     

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

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.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.