Ru(phen)32+-SO32+-Ce(Ⅳ)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen)32+-SO32+-Ce(Ⅳ)体系化学发光法测定溶液中亚硫酸盐的方法.SO32-浓度与化学发光强度在1.0×10-7～1.0×10-4mol/L范围内成正比,检出限为1.97×10-7mol/L(S/N=3),1.0×10-4mol/LSO32溶液重复6次测定结果的相对标准偏差为4.9%.该方法用于测定白葡萄酒中亚硫酸盐总含量为4.006×10-5mol/L,加标回收结果令人满意.     

流动注射化学发光传感器测定血清中的氧氟沙星

在酸性条件下,Ce(Ⅳ) 氧化Ru(bipy)2 3生成Ru(bipy)3 3,同时氧化氧氟沙星生成中间态的自由基,Ru(bipy)3 3和中间态自由基接触后能产生强烈的化学发光.利用该反应,将Ru(bipy)2 3固定在阳离子交换树脂上,结合流动注射分析技术,建立了一种测定氧氟沙星的流动注射化学发光传感器.结果表明,氧氟沙星浓度在2×10-7～8×10-6 mol/L(r=0.999 3)范围内与化学发光强度有良好的线性关系,检出限为6×10-8 mol/L (3σ),对5×10-6mol/L的氧氟沙星测定的相对标准偏差(RSD)为2.2%(n=11).该传感器成功地用于血清样品中的氧氟沙星的测定.     

化学发光微流动注射芯片检测雨水中的过氧化氢

基于在聚甲基丙烯酸甲酯(PMMA)材料上利用激光雕刻微流动注射通道和控制时间进样的模式,并将分离系统(离子交换树脂)引入到微流动注射系统中,结合luminol Co2 H2O2化学发光体系,建立了化学发光微流动注射芯片在线测定过氧化氢的方法.结果表明,采用该方法测定H2O2的线性范围为1×10-4～2×10-7mol/L,检出限为9 5×10-8mol/L,相对标准偏差RSD=2 9%(c=1×10-5mol/L,n=11).与常规的流动注射化学发光分析法相比,该芯片具有简单、操作方便、灵敏度高、分析速度快、尤其是耗样量少等特点,已应用于雨水中过氧化氢的测定.     

高锰酸钾—鲁米诺化学发光体系测定香草醛

为了拓展流动注射化学发光法在食品检测中的应用,利用草醛能够增敏NaOH介质中高锰酸钾—鲁米诺化学发光体系的发光信号的特点,建立了化学发光测定香草醛的方法。文中考察了介质浓度、发光试剂浓度等因素对发光体系信号的影响,确定了测定香草醛的最佳条件:介质NaOH浓度为0.20 mol/L,高锰酸钾浓度为3.0×10-5mol/L,鲁米诺浓度为7.0×10-5mol/L。在优化实验条件下,体系的发光强度与香草醛浓度在5.0×10-8～3.0×10-6 g/mL内呈线性关系,标准曲线:ΔI=7.188 3×108C(g/mL)+71.767 4(r=0.994 2)。对5.0×10-7g/mL的香草醛平行测定11次,相对偏差为1.3%,其检出限为1.1×10-8g/mL。建立了测定香草醛的流动注射化学发光法新方法,并成功地测定了片剂中香草醛的含量,回收率为98%～104%。     

反相流动注射化学发光法测定姜黄素的研究

姜黄素对鲁米诺 过氧化氢 铬(Ⅲ)体系化学发光具有强烈的抑制作用,基于此首次建立了测定姜黄素的流动注射化学发光分析新方法.实验结果表明,在优化的实验条件下,化学发光信号强度ΔI与姜黄素的浓度在1.0×10-10～1.0×10-8mol/L范围内分段成良好的线性关系,方法检出限为5.0×10-11mol/L,相对标准偏差为2.8%(c=2.0×10-9mol/L,n=11).该法已应用于中药姜黄中姜黄素总量的测定.     

鲁米诺-铁氰化钾化学发光体系测定孔雀石绿

基于鲁米诺在碱性条件下可以被铁氰化钾催化氧化产生化学发光,孔雀石绿对此化学发光具有增敏作用这一现象,结合流动注射技术建立了一种直接测定孔雀石绿的流动注射化学发光新方法.结果表明,该方法的线性范围为1.0×10-6-9.0×10-5mol/L,检出限为4×10-7mol/L.对1.0×10-5mol/L的孔雀石绿连续进行七次平行测定,其相对标准偏差为2.3%.     

流动注射化学发光法测定啤酒中的单宁酸

基于在甲醛存在条件下，酸性介质中，高锰酸钾氧化单宁酸产生较强的化学发光反应，结合流动注射技术，建立了单 宁酸的流动注射化学发光测定方法。该法的化学发光强度在单宁酸的浓度为8． 0×10~(-8) ～5． 0×10~(-6) mol/L 范围内呈良好的线 性关系，检出限为5． 0×10~(-8) mol／L(S/N=3) ，测定的相对标准偏差为2． 7％(N=11) 。该法用于测定几种啤酒中微量的单宁酸 测定，结果令人满意。     

Ru(phen)_3~(2+)-SO_3~(2-)-Ce(IV)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen) 3 2 + -SO3 2 --Ce(IV)体系化学发光法测定溶液中亚硫酸盐的方法 SO3 2 -浓度与化学发光强度在 1 0× 10 -7～ 1 0× 10 -4mol/L范围内成正比 ,检出限为 1 97× 10 -7mol/L(S/N =3) ,1 0× 10 -4mol/LSO3 2 -溶液重复 6次测定结果的相对标准偏差为 4 9% 该方法用于测定白葡萄酒中亚硫酸盐总含量为 4 0 0 6× 10 -5mol/L ,加标回收结果令人满意     

Ru(phen)32+-SO32--Ce(Ⅳ)体系化学发光法测定葡萄酒中的亚硫酸盐总量

提出了Ru(phen)32+-SO32+-Ce(Ⅳ)体系化学发光法测定溶液中亚硫酸盐的方法.SO32-浓度与化学发光强度在1.0×10-7～1.0×10-4mol/L范围内成正比,检出限为1.97×10-7mol/L(S/N=3),1.0×10-4mol/LSO32溶液重复6次测定结果的相对标准偏差为4.9%.该方法用于测定白葡萄酒中亚硫酸盐总含量为4.006×10-5mol/L,加标回收结果令人满意.     

CuFe2O4纳米粒子增敏Luminol-EDTA化学发光体系研究及应用

基于CuFe_2O_4纳米粒子能显著增强Luminol-EDTA体系的发光,首次建立了Luminol-EDTA-CuFe_2O_4 NPs化学发光新体系。紫外吸收光谱和化学发光光谱表明纳米CuFe_2O_4注入Luminol-EDTA体系后,未生成新发光物质,结合纳米CuFe_2O_4的特性,提出了CuFe_2O_4 NPs参与Luminol-EDTA体系可能的发光机理。研究发现芦丁能抑制Luminol-EDTACuFe_2O_4 NPs体系的化学发光,结合流动注射技术,将此化学发光体系应用于芦丁片中芦丁含量的测定。在优化实验条件下,芦丁浓度在2×10~(-8)~2×10~(-5) mol/L范围内芦丁浓度的对数和相对化学发光值呈线性,芦丁浓度检出限(LOD)为1.21×10~(-9) mol/L。将本方法应用于芦丁片中的芦丁含量测定,回收率为97%~102%,RSD为2.54%(c=1×10~(-7) mol/L,n=11)。     

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.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-