盐酸莫西沙星的吸附伏安特性及其应用

在0.25mol·L-1KH2PO4-NaH2PO4(pH6.38,GB604-88 5.)底液中,盐酸莫西沙星(Moxifloxaein Hydrochloride,简称MF)在汞电极上有一线性扫描还原峰,峰电位EP=-1.24V(vsAg/AgCl),该峰具有明显的吸附性;吸附粒子为MF中性分子,测得MF在汞电极上的饱和吸附量Fs=4.31×10-11mol·cm-2,每个MF分子所占电极面积为2.12nm2,MF在汞电极上的吸附符合Langmuir吸附等温式;测得吸附系数β=1.11×106,25℃时的吸附自由能ΔGθ=-35.24kJ·mol-1,电极反应电子数n=2,不可逆体系动力学参量αna=1.21,表面电极反应速率常量ks=0.3-1s-1;建立了吸附溶出伏安法测定MF的最佳条件,方法的检出限为2.0×10-8mol·L-1.     

头孢吡肟在玻碳电极上的电化学行为研究

在0.1 mol·L-1KH2PO4-NaOH(pH=8.0)介质中,头孢吡肟在玻碳电极上产生-灵敏的氧化峰,其峰电流Ip与头孢吡肟在5.2×10-6～2.6×10-5mol·L-1内有良好的线性关系(r=0.999 6),检出限为5.13×10-9mol·L-1,回收率98.33%,RSD为2.12%.用线性扫描和循环伏安法研究了体系性质,结果表明,头孢吡肟的电极过程为具有吸附的不可逆过程,电极反应转移电子数为2.     

电化学法直接测定游离硫离子

用电化学方法在pH=13、15～18℃环境中直接测定游离S2-,灵敏、简便.实验以单线性伏安法,采用铂盘电极对S2-进行测试,结果显示,线性范围为1.00×10-5～5.00×10-4mol·L-1,检测限在1.00×10-5mol·L-1,回收率92.03%.对五个天然水体样品进行测定,其中一个样品中的S2-浓度是2.00×10-5mol·L-1,     

Zn(II)-Morin配位吸附波的研究及应用

以桑色素(Morin)为配位体,研究了Zn(II)与其形成的配合物在汞电极上的极谱行为和极谱波的性质,确定了Zn(II)-Morin配合物的组成。在pH=4.7的0.1 mol.L-1HAc-NaAc底液中,Zn(II)-Morin配合物在2.0次微分极谱图上产生良好的吸附还原波。其峰电位为-1.14 V,峰电流与Zn2 在7.5×10-8~4.3×10-6mol.L-1的浓度范围内呈线性关系,最低检出限为7.5×10-8mol.L-1。用于实际样品测定,结果令人满意。     

维生素B2在多壁碳纳米管修饰电极上的电化学行为及伏安测定

运用循环伏安法(CV)、线性扫描伏安法(LSV)等方法研究了维生素B2在多壁碳纳米管修饰电极上的电化学行为,建立了一种直接测定维生素B2的电化学分析方法.与裸玻碳电极相比,多壁碳纳米管修饰电极显示出很好的催化作用,维生素B2在修饰电极上得到一对灵敏的氧化还原峰(Epa=-0.222 V,Epc=-0.317 V),且氧化还原峰电流显著增强.在优化实验条件下,还原峰电流与维生素B2浓度在3.0×10-6～2.0×10-5 mol·L-1有良好的线性关系,检出限为1.0×10-6 mol·L-1.对1.0×10-5 mol·L-1维生素B2溶液平行测定10次的相对标准偏差(RSD)为4.2%.用此方法测定了维生素B2片中维生素B2的含量,结果满意.     

吲哚醌的荷移分光光度法测定

研究表明吲哚醌与茜素可形成络合比为1:1的稳定的络合物.在最大吸收波长543 nm处,吲哚醌的浓度在5.0×10-6 mol·L-1～1.0×10-4 mol·L-1范围内遵从比尔定律.该方法应用于尿液和血清中吲哚醌的含量测定,回收率为 96.4 %～105.0 %.     

N—（8—喹啉基）—N‘—苯甲酰基硫脲的极谱行为研究

本文研究了N-(8-喹啉基)-N’-苯甲酰基硫脲的极谱性质。发现在0.1mol·L~(-1)KBr-0.05mol·L~(-1)NaOH/K_2HPO_4溶液中,其产生三个清晰的阴极化示波极谱波,二次导数峰电位分别为-0.40V,-0.77V及-1.20V(VS.SCE),相应的线性范围依次是1.0×10~(-6)～4.0×10~(-5)mol·L~(-1),1.0×10~(-6)～5.0×10~(-5)mol·L~(-1),1.0×10~(-8)～2.0×10~(-6)mol·L~(-1)。文中对极谱波性质和电极反应机理进行了探讨。研究表明,前两峰分别为>C=S,>C=O的电还原,后者为氢催化波。     

茜素蓝S的极谱行为和稀土—茜素蓝S极谱络合吸附波研究

在pH 10.5的0.2mol/L乙二胺—盐酸底液中,用单扫极谱法可获得茜素蓝S的可逆的强吸附波和稀土离子—茜素蓝S的络合吸附波。茜紊蓝S在汞电极上的吸附符合Frumkim等温式。用该法测定了发光材料SrB_2O_7∶Eu中的铕含量,并研究了络合吸附波的电极过程。     

4A沸石/离子液体修饰碳糊电极的电化学行为及其对多巴胺的测定

以4A沸石和1-正丁基-3-甲基咪唑六氟磷酸盐离子液体为修饰剂,制备了沸石/离子液体修饰碳糊电极,研究了该电极的电化学行为及其对多巴胺的选择性测定。实验表明:该修饰电极在铁氰化钾溶液中有一对明显的氧化还原峰,而且可逆性较好。在沸石/离子液体修饰电极上,抗坏血酸和多巴胺的峰电位差大约为225 mV;在抗坏血酸存在下,多巴胺的峰电流与浓度在5.0×10-8 mol·L-1到9.0×10-6 mol·L-1的范围内呈现良好的线性关系,检出限为4.9×10-9 mol·L-1(S/N=3)。该电极具有高灵敏性和稳定性,可用于多巴胺的检测。     

巯基乙酸修饰电极选择性测定对苯二酚

通过自组装得方法制备了巯基乙酸修饰的金电极.在0.10 mol·L-1的磷酸盐缓冲溶液中(pH=7.0),用循环伏安法和示差脉冲伏安法研究了对苯二酚在修饰电极上的电化学行为,在相对低的电位条件下,对苯二酚显示一对氧化还原峰.在1.0×10-6mol·L-1到3.0×10-3mol·L-1浓度范围内,氧化峰电流与对苯二酚的浓度成线性关系,相关系数是0.998,检测限为4.0×10-7mol·L-1.该修饰电极在间苯二酚存在的条件下,能被用于选择性检测对苯二酚,得到了令人满意的结果.     

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-