碳糊电极线性扫描伏安法测定微量铜

建立碳糊电极阳极溶出伏安法测定微量铜的分析方法。在pH=2．2的B-R缓冲溶液中,通过在-1．20V(vs．SCE)电位下富集Cu^2 后．在-0．40- 1．0V电位范围内作阳极溶出伏安扫描,在 0．29V处有一灵敏的氧化峰。峰电流与Cu^2 浓度在0．5—5μg／mL范围内有良好线性关系,检出限为0．4μg／mL。     

微分脉冲阳极溶出伏安法测定铝土矿中镓

在ＰＨ３的盐酸介质中，Ｇａ与邻苯二酚形成络合物。用微分脉冲阳极溶出伏安法测定，在－０．６９伏特出现阳极溶出峰。在－１．５伏特下电解富集９０秒，用微分脉冲溶出伏安法测定铝土矿中向量镓。     

微分脉冲阳极溶出伏安法连续测定葛花中微量锌、铜

微分脉冲阳极溶出伏安法测定葛花中微量锌和铜.在0.01mol/L的高氯酸溶液中,锌、铜均有良好的溶出峰.测定结果与原子吸收光谱法以及光度法相符.方法简便、反应灵敏、准确度高.Zn2+在0～0.8ug/ml、Cu2+在0～0.4ug/ml分别与其溶出峰电流呈良好的线性关系.     

呋喃妥因的伏安法测定

应用循环伏安法、微分脉冲伏安法对呋喃妥因在玻碳电极上的伏安行为及其测定进行了研究 .实验发现 ,在 0 .10 mol/ L的 HCl底液中 ,对其进行微分脉冲阴极溶出伏安扫描 ,于 - 0 .0 7V(vs.SCE)产生一还原峰可用于呋喃妥因的定量测定 .该还原峰的微分脉冲伏安峰电流与呋喃妥因的浓度在 5.0 0× 10 -7～ 3.0 0× 10 -5mol/ L范围内呈良好的线性关系 .对 1.0 0× 10 -5mol/ L的呋喃妥因溶液中进行 10次实验 ,该峰的峰电流相对标准偏差为 2 .6 8% .本方法检测限为 2× 10 -8mol/ L.     

线性扫描吸附伏安法测定食品中痕量氟

报道了食品中氟的线性扫描溶出伏安法测定 .在 p H=4 .9的 0 .0 2 mol/L六次甲基四胺的缓冲溶液中 ,铈 -茜素络合剂 -氟的络合物产生一灵敏的阴极峰 ,峰电位为 -0 .85V( vs.SCE) ,峰高与 F- 浓度在 2 .0× 1 0 - 8～ 4 .0× 1 0 - 7mol/L范围内呈线性关系 ,检出限为 1 .0× 1 0 - 8mol/L .该法用于食品中的痕量氟的测定 ,结果满意 .另外 ,对峰电流的性质和电极反应的机理进行了研究     

大黄素的吸附伏安行为及定量测定

大黄素在1％硼砂底液中，有一灵敏的吸附伏安还原峰．峰电位为-0．86V(vs.Ag／AgCl)．在电位-0．3V下预富集，采用微分脉冲吸附溶出伏安法测定，其检测限可达8．0×10^-10mol／L，大黄素在1×10^-8～1×10^-6mol／L浓度范围内．峰电流与浓度呈线性关系此法简便、快速、可靠．     

多壁碳纳米管石墨糊修饰电极阳极溶出伏安法测定铜

制备了MWNT-石墨糊修饰电极,研究了以该电极为工作电极,用阳极溶出伏安法测定Cu2 的最佳实验条件.在0.6mol/L硫酸溶液中,于-0.6V(vs.SCE)处富集420s后进行阳极溶出伏安扫描.Cu2 浓度在1×10-6-2×10-5mo/L范围内与峰电流成线性关系;在5×10-7-4×10-6mo/L范围内与峰电流二次导数呈线性关系.检出限为1.25×10-7mol/L.     

半微分阴极溶出伏安法研究溴离子的测定条件

半微分阴极溶出伏安法研究溴离子的测定条件＠张华丽＠杨国新半微分阴极溶出伏安法研究溴离子的测定条件张华丽杨国新＊（化学系）在文［１～３］的基础上，为寻求更多的测定溴离子的途径，我们用半微分阴极溶出伏安法，采用醋酸、醋酸钠和柠檬酸钠络合性混合底液，研究用银基汞...     

加替沙星的吸附伏安特性及其应用

在0.3mol/L KH2PO4-NaH2PO4(pH6.4)底液中,加替沙星(GTF)在汞电极上的线性扫描伏安测试显示一个还原峰,并具有明显的吸附特性,测得GTF在汞电极上的饱和吸附量为40.1pmol/cm2.GTF在汞电极上的吸附符合Langmuir吸附等温式,建立了吸附溶出伏安法测定GTF的最佳条件,方法的检出限为20.0nmol/L.     

安定在碳糊电极上的电化学特性

在０．０５０ｍｏｌ／Ｌ ＨＣｌ和０．０１５ｍｏｌ／Ｌ ＫＮＯ３溶液中,安定在碳糊是极上于－０．７７Ｖ左右产生一灵敏的吸附阴极溶出伏安峰。线性范畴为１．０×１０＾－７￣４．０×１０＾－５ｍｏｌ／Ｌ,检测下限为５．０×１０＾－８ｍｏｌ／Ｌ,测定了血清中的安定含量,结果满意,循环伏安实验结果证实安定在碳糊电极上的吸附为反应物吸附。     

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.     

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。     

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.     

《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