锡在金电极上的欠电位单层沉积的分析应用

用循环伏安法研究了Sn2 在金盘电极上的欠电位沉积.在特别提纯的1 mol/L HCl支持电解质溶液中,Sn2 在金盘电极上可以产生清晰的欠电位沉积峰和本体沉积峰.基于Au/Sn欠电位体系优良的电化学特性,发展了一种选择性好、灵敏度高的电化学分析方法.Sn2 浓度在1.96×10-10～2.91×10-s mol/L范围内与峰电流有线性关系.连续7次测定1.0×10-9 mol/L Sn2 得到的相对标准偏差为5.06%.该方法已用于实际样品的测定,所得结果与原子发射光谱(ICP-AES)所得数据相吻合.     

多壁碳纳米管修饰玻碳电极测定L-半胱氨酸

将多壁碳纳米管滴涂于玻碳电极表面,制作多壁碳纳米管修饰玻碳电极(MWNTs/GCE),研究L-半胱氨酸(Cys)在此修饰电极上的电化学行为,并建立一种电化学检测L-半胱氨酸的新方法.在最佳实验条件下,L-半胱氨酸在2.0 × 10-6～1.0×10-4 mol/L浓度范围内与峰电流呈良好线性关系.其回归方程为Ip(μA...     

多巴胺在聚磺基水杨酸修饰电极上的电化学测定

研究了聚磺基水杨酸修饰玻碳电极的制备及多巴胺在此修饰电极上的电化学行为.在磷酸盐缓冲溶液中,多巴胺在修饰电极上呈现两个还原峰和两个氧化峰.其峰电位随着pH的增加而负移.多巴胺的氧化峰电流与其浓度分段呈线性关系:在3×10-7～9×10-6mol/L浓度范围内,其回归方程为ipa (10μA) = 0.23548 0.30552c(mol/L),相关系数r=0.9930;在10-5-10-4mol/L浓度范围内,其回归方程为ipa(10μA) =2.35604 0.0685c (mol/L), 相关系数r=0.9913.检出限为3.0×10-7mol/L.实验结果表明:该修饰电极能有效消除抗坏血酸的干扰,用于注射液中多巴胺的检测,其回收率在97.7%-101.6%范围内.     

吸附溶出伏安法同时测定水中痕量锌和镉

报道了同时测定痕量锌和镉的新方法 .在 0 .0 1mol/LHAc - 0 .0 1mol/LNaAc- 1.2× 10 - 5mol/L乙醛酸缩氨基硫脲 (GATSC)中 ,Zn -GATSC和Cd -GATSC均产生非常灵敏的吸附波 ,峰电位分别是 - 0 .82V和 - 0 .4 3V(vs·SCE) ,峰电流和锌、镉的浓度分别在 3.0× 10 - 8～ 8.0× 10 - 7mol/L和 1.0× 10 - 8～ 6 .0× 10 - 7mol/L范围内成直线关系 ,检测限分别是 8.0× 10 - 9和 3.0× 10 - 9mol/L .该方法用于测定水中痕量锌和镉 ,结果令人满意     

Hg2+在纳米二氧化钛膜电极上的电化学行为研究

以nano-TiO2膜修饰玻碳电极作为工作电极,采用阳极溶出伏安法测定水相中的痕量Hg2 .详细研究了Hg2 在nano-TiO2膜修饰玻碳电极上的电化学响应行为,并对各种实验参数进行了优化.实验结果表明,在pH 4.5的磷酸盐缓冲溶液中,在-1.2 V电位下富集7 min,再静置60 s后阳极化扫描,Hg2 在nano-TiO2修饰的玻碳电极上于0.14 V出现一个灵敏尖锐的阳极溶出峰.相比于裸玻碳电极,该峰电流大大提高,且峰电位略微负移,表明nano-TiO2对Hg2 的溶出具有一定的增敏作用.在最优化实验条件下,Hg2 溶出峰电流与其浓度分别在2×10-8～1×10-6mol/L和2×10-6～8×10-6mol/L呈良好的线性关系,富集12 min,检出限可达5×10-6mol/L.该修饰电极还具有一定的抗干扰能力,将其应用于实际水样中Hg2 的检测,结果令人满意.     

铅在氧化石墨烯-纳米氧化镍修饰玻碳电极上的电化学行为

用氧化石墨烯-氧化镍纳米复合膜修饰玻碳电极,制备了电化学传感器.用循环伏安法研究了铅在该电极上的电化学行为,建立了差分脉冲溶出伏安法测定痕量铅的电化学分析法,详细优化了氧化石墨烯的用量、富集电位、富集时间、电聚圈数、底液的pH值等测定条件.研究结果表明:在优化条件下,Pb2+的浓度在1×10-7～1×10-6mol/L的范围内与溶出峰电流呈良好的线性关系,检出限为1×10-8mol/L.将该方法用于水样中Pb2+的测定,回收率为96.5%～104.2%.     

聚L-苯丙氨酸修饰电极测定尿酸

用循环伏安法制备聚L-苯丙氨酸修饰玻碳电极,研究尿酸在聚L-苯丙氨酸修饰电极上的电化学行为,建立循环伏安法测定尿酸的新方法.在pH 4.0的磷酸盐缓冲溶液中,尿酸在聚L-苯丙氨酸修饰玻碳电极上出现一氧化峰,峰电位为Epa=+638 mV(相对于Ag/AgCl电极),氧化峰电流与尿酸浓度在5.00×10-7～5.00×10-5 mol/L范围内成线性关系,检测限:1.0×10 -7 mol/L.对1.0×10 -5 mol/L UA溶液平行测20次,其相对标准偏差为3.1%.用于尿液中尿酸的测定,结果满意.     

利用聚孔雀石绿薄膜修饰电极测定磺胺醋酰钠

利用聚孔雀石绿薄膜修饰电极(PMGE)对磺胺醋酰钠( SS) 的电催化作用,建立一种新的对SS含量进行定量分析的电化学分析方法.在0.2mol/L KH2PO4- Na2HPO4(pH 6.86,PBS) 缓冲溶液中,以PMGE为工作电极,在0.4-1.2 V电位范围内以100 mV/s的扫描速率进行循环伏安扫描,根据循环伏安图上催化峰电流的大小,对SS进行定量分析.结果表明,SS的浓度在5.0×10-5 mol/L~1.5×10-3 mol/L范围内与氧化峰电流呈现出良好的线性关系,线性相关系数为:CR=﹣0.9990,检测限达2.0×10-6 mol/L.8次平行样品测定结果的相对标准偏差不大于1.5 %,样品回收率为98.2 % ~107.6 %.将该法用于实际样品中SS的定量分析,得到满意结果.     

新型量子点修饰金电极的制备及其在检测多巴胺中的应用

用3-巯基丙酸(MPA)包覆的碲化镉量子点(CdTe QDs)在金电极上进行自组装,制备了CdTe QDs修饰金电极(CdTe QDs/Au E)。利用循环伏安法研究此修饰电极的电化学行为,以[Fe(CN)6]3-/4-为探针,考察了CdTe QDs自组装膜修饰金电极的电化学性质。而且研究了多巴胺(DA)在此电极上的电化学行为,结果表明:DA在此修饰电极上可被电催化氧化。差分脉冲伏安(DPV)氧化峰电流与DA浓度在1.00×10-9～6.40×10-5mol/L范围内呈线性关系,检出限为3.30×10-10mol/L.     

谷胱甘肽自组装膜修饰电极用于Cr(VI)离子的测定

将谷胱甘肽(GSH)自组装膜修饰电极用于Cr(Ⅵ)的测定.实验表明,在0 02mol/LH2SO4 0 1mol/LNaNO3溶液中,在 1 00～-0 40V电位范围内进行循环伏安扫描,于 0 29V(Vs.SCE)处获得铬的还原峰信号、 0 65V(Vs,SCE)处获得铬的氧化峰信号.Cr(VI)在GSH/Au修饰电极上的电化学行为比裸金电极有明显的改善,峰电流更为灵敏,且还原峰电流随着Cr(VI)浓度的增加而增大,因此选择 0 29V的还原峰作为分析信号,运用1 5次微分线性扫描伏安法对铬进行了定量分析,线性范围为1 0×10-8～1 0×10-6mol/L,检测限为1 0×10-9mol/L.将所建立的方法应用于湖水样品中铬含量的测定,以ICP进行对照实验,结果满意.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

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

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

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.     

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。     

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

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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