催化褪色光度法测定痕量铁-亚甲基蓝-铁(Ⅲ)-过氧化氢体系

研究了在稀H2SO4介质中,铁(Ⅲ)催化H2O2氧化亚甲基蓝的褪色反应,建立了催化动力学光度法测定痕量铁的新方法.其检出限为3.2×10-4μg·ml-1,在0.010～0.500μg/25ml范围内,铁(Ⅲ)与lgA0/A呈良好的线性关系.该方法指示反应灵敏度高,选择性好,用于食品中铁的测定,获得满意结果.     

催化动力学光度法测定微量铁的研究—Fe（Ⅲ）—结晶紫—H2O2体系

研究了在H2 SO4 介质中 ,Fe(Ⅲ )对H2 O2 氧化结晶紫褪色反应的催化作用及最佳实验条件和动力学参数 ,建立了测定痕量铁的新方法 .方法的检出限为 2 73× 10 -11g/L ,测定范围 0～ 2 5 μg/L ,用于各种水中微量铁的测定 ,获得满意结果     

流动注射催化光度法同时测定铁和锰

基于铁(Ⅲ)和锰(Ⅱ)对高碘酸钾氧化罗丹明B褪色的催化作用及在不同反应条件下二者催化作用的差异，以反应条件作为化学计量学中的量测通道，应用岭回归法对铁(Ⅲ)和锰(Ⅱ)同时测定进行了研究，建立了流动注射催化光度法同时测定铁和锰的方法。在铁(Ⅲ)和锰(Ⅱ)浓度比为1：4——2：1的范围内，应用该法对其混合物进行测定，田收率分别为101．2％和101．1％。     

食品中微量铁的化学发光测定

本文研究了铁(Ⅲ)一亚铁氰化钾一鲁米诺化学发光新体系,提出了一个测定铁的高灵敏化学发光分析法,该方法对铁(Ⅲ)的检出限为9×10~(-100g/ml,相对标准偏差小于4%,线性范围是4×10~(-8)～2×10~(-5)g/ml·     

2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯胺-过氧化氢催化动力学光度法测定痕量铁的研究

在pH3.5的HAc-NaAc缓冲溶液介质和加热条件下,痕量铁(Ⅲ)对H2O2氧化2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯胺(CTZAN)的褪色反应具有显著的催化作用,褪色反应程度与铁(Ⅲ)量在一定范围内呈线性关系,建立了测量痕量铁(Ⅲ)的催化动力学光度法。褪色体系的最大吸收波长为425nm,Fe(Ⅲ)质量浓度在(0.01—0.20)mg/L范围内符合线性关系,回归方程为ΔA=4.491ρ+0.0066(ρ:mg/L),相关系数为0.9982,检出限为2.02×10-9g/mL。方法用于面粉及头发中痕量铁的测定,结果与AAS测定结果相符。     

不同树脂负载铁(Ⅲ)活化H_2O_2降解有毒有机污染物

将不同类型树脂(大孔强碱性阴离子交换树脂D201、螯合树脂D401、大孔强酸性苯乙烯阳离子交换树脂D001)负载铁(Ⅲ)作为光催化剂,在可见光(≥420nm)照射下,通过外加H2O2光催化降解罗丹明B(Rhodamine B,RhB).结果表明,在可见光和pH=6.2条件下,螯合树脂D401负载铁(Ⅲ)光催化剂具有最好的光催化活性.该催化剂对RhB降解的最佳条件为:催化剂用量400mg/L,H2O2浓度7.49×10-4 mol/L.并且,该催化剂在可见光条件下对无色小分子二氯苯酚(2,4-Dichlorophenol,DCP)也具有良好的光催化降解活性,表明其具有可见光催化活性.同时,跟踪测定了螯合树脂D401负载铁(Ⅲ)光催化剂在RhB降解过程中羟基自由基(·OH)的变化,结果表明光催化机理涉及·OH氧化历程.     

痕量Fe(Ⅲ)催化动力学分析的新方法

研究了硫酸介质中 ,铁 (Ⅲ )催化过氧化氢氧化百里酚蓝而使其褪色的新指示反应 ,建立了一种催化动力学光度法测痕量铁 (Ⅲ )的新方法 ,其灵敏度达到 3.4 7× 10 -10 g/mL ,测定范围是 0～ 0 .4 μgFe3 + /2 5mL .用于水样、人发中痕量铁 (Ⅲ )的测定 ,获得了满意的结果     

光度法研究姜黄素与铁(Ⅲ)的络合反应

目的研究姜黄素与铁(Ⅲ)的络合反应,并建立铁的测定方法。方法采用分光光度法。结果在10~(-5)～10~(-3)mol/L范围内,姜黄素有不同的吸收光谱;其与铁络合物的吸收波长由430nm红移至496 nm,呈增色反应。在pH 5.60,浓度为6.51×10~(-4)moL/L姜黄素液中,络合物为酒红色,λ_(max)=496 nm,ε=3.86×10~6L/mol·cm,铁(Ⅲ)的线性范围为0.20～2.00μg/mL。结论在较高浓度下自动聚合的姜黄素与铁(Ⅲ)反应更灵敏。在此基础上,建立的姜黄素测定铁的分光光度法操作简单,选择性较好,灵敏度高,用于自来水中铁(Ⅲ)的测定,结果满意。     

催化褪色光度法测定痕量铁的研究

研究了在稀 H2 SO4 介质中 ,痕量铁催化 H2 O2 氧化甲基红褪色反应 ,建立了一种高灵敏、高选择性测定痕量铁的新方法 .检出限为 5 .0× 1 0 - 7g/L,线性范围 0 .0 μg/1 0 m L～0 .4μg/1 0 m L,用于食品中铁的测定 ,结果令人满意     

Fe(Ⅱ)-2,2'-联吡啶分光光度法测定维生素B1

基于维生素B1(VB1)可将Fe(Ⅲ)还原为Fe(Ⅱ)．生成的Fe(Ⅱ)与2,2’-联吡啶形成桔红色配合物．建立了偶合反应分光光度法测定VB1的新方法．线性范围2．4～21．0mg／L．相对标准偏差为2．7％．该方法用于VB1片剂、针剂的测定,结果与药典标准方法测得值一致．     

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