电沉积咖啡酸玻碳修饰电极对抗坏血酸的催化氧化

在pH=7.0的磷酸缓冲溶液中采用电沉积技术将咖啡酸修饰于玻碳电极表面制备了一层稳定的薄膜,该修饰电极制备简单,稳定性良好.用循环伏安法研究了抗坏血酸在修饰电极上的电化学行为,其氧化峰电流与抗坏血酸的浓度和pH值有关,当pH值达到7.7时,抗坏血酸在修饰电极上的氧化峰电流最大,氧化峰电流与抗坏血酸浓度在4.0×10-5～2.0×10-2mol/L范围成良好的线性关系,检测限为1.0×10-5mol/L,方法简单、快速、准确,可应用于抗坏血酸药片的检测.     

多巴胺在聚L-天冬氨酸修饰电极上的催化氧化及测定

研究了聚L_天冬氨酸修饰电极的制备及其电化学性质。实验表明 ,该修饰电极对神经递质多巴胺的电化学氧化有显著的催化作用 ,使电极反应过程的可逆性变好 ,峰电流明显增大。采用差示脉冲伏安法对多巴胺进行定量分析 ,线性范围为 1 0× 10 - 7～ 1 0× 10 - 4 mol L ,检出限为 5 0× 10 - 8mol L。该聚合物修饰电极具有良好的选择性 ,能有效地排除抗坏血酸对测定的影响 ,用于合成样品分析 ,结果令人满意。     

多巴胺在纳米金修饰微玻碳电极上的电化学行为研究

用电沉积的方式制备了纳米金修饰微玻碳电极 ,该修饰电极能分开多巴胺和抗坏血酸的氧化峰 .研究了溶液pH值、磷酸缓冲溶液浓度对多巴胺电化学行为的影响 .多巴胺氧化峰电流值与其浓度在 5× 10 - 6～ 1× 10 - 4mol/L范围内成线性关系 .     

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.     

聚甲基红膜修饰电极对儿茶酚的测定

用电化学方法制备了聚甲基红膜修饰电极,该电极对儿茶酚有明显的电催化作用,其氧化峰电位负移70mV,峰电流显著增加,儿茶酚的氧化峰电流在2 0×10-6～1 0×10-4mol/L范围内与其浓度成线性关系,该电极性能稳定,重现性好.     

聚组氨酸修饰电极测定多巴胺的研究

本文研究了多巴胺在聚组氨酸修饰电极上的循环伏安行为.在pH7.0的磷酸盐缓冲溶液中,用线形扫描伏安法测定多巴胺的线性范围为:6.0×10-8～1.0×10-5mol/L,1.5×10-5～1.0×10-3mol/L,检出限为4×10-8mol/L.用于药剂中多巴胺的测定,结果满意.     

抗坏血酸在半胱氨酸自组装膜上的电化学行为及应用

半胱氨酸自组装修饰金修饰电极对抗坏血酸(Vc)具有很高的电催化氧化活性.在pH 2.0的0.1 mol/L缓冲溶液中,可得到一对准可逆的氧化还原峰.电极反应受扩散控制.氧化峰电流与抗坏血酸浓度在5.0×10-6～1.1×10-3 mol/L范围内成线性关系,检测限为1.0×10-6 mol/L.该分析方法应用于果汁中的抗坏血酸分析,结果令人满意.     

多壁碳纳米管-[BMIM]PF_6修饰电极测定Hg~(2+)

制备了多壁碳纳米管(MWCNT)-离子液体([BMIM]PF6)修饰电极并作为工作电极,采用阳极溶出伏安法检测Hg2+。研究表明,Hg2+在修饰电极上可得到灵敏的溶出峰。考察了实验条件对Hg2+在该修饰电极上溶出伏安行为的影响。在优化的实验条件下,Hg2+在1.0×10-6mol/L～1.0×10-4mol/L浓度范围内与其溶出峰电流呈良好的线性关系,相关系数为0.9992,检出限为1.0×10-7mol/L。该修饰电极制备简单,用于微量汞的检测,效果良好。     

聚对氨基苯甲酸修饰电极测定药剂中的多巴胺

本文研究了聚对氨基苯甲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pH为7．5的磷酸盐缓冲溶液中,多巴胺在此修饰电极上呈现三个峰,两个还原峰和一个氧化峰,其峰电位随着pH的增加而负移。多巴胺浓度在3．0×10~(-6)～8．0×10~(-4)mol/L的范围内与其氧化峰电流呈线性关系,回归方程为i_p(10μA)=0．92023 0．36264c(mol/L),相关系数r=0．9925,检出限为2．0×10~(-8)mol/L。实验结果表明：该修饰电极能有效消除抗坏血酸的干扰,方法用于注射液中多巴胺的检测,其回收率在98．9%～100．5%范围内。     

单壁碳纳米管化学修饰电极的制备及其测定鸟瞟呤的研究

报告了一种制备单壁碳纳米管化学修饰电极的方法,并研究了鸟嘌呤在此修饰电极上的电化学行为.鸟嘌呤在单壁碳纳米管修饰玻碳电极上出现一个灵敏的氧化峰,峰电流位于0.64V(vs.SCE).与裸玻碳电极相比,单壁碳纳米管修饰电极显著提高鸟嘌呤的氧化峰电流.优化了各项测定参数,建立了一种直接测定鸟嘌呤的电分析方法.氧化峰电流与鸟嘌呤的浓度在5×10～8-2 × 10-5mol/L之间有很好的线性关系,开路富集3min,检出限为2×10～8mol/L.该方法检测限低、分析速度快、重现性好、准确可靠.     

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