优化的原子荧光法测定砷汞含量

建立了用AFS-830双道原子荧光光度计同时测定不同样品中砷和汞的氢化物发生-原子荧光法检测方法.在优化的仪器工作条件下:砷和汞的线性检测范围广,分别为0~10μg/L和0~1μg/L;方法灵敏,检出限分别为0.042μg/L和0.038μg/L;样品加标回收率高,分别为99.5%~100.1%和97.5%~99.9%,可用于工业环境监测中测定不同样品中的砷和汞的含量.     

O—FPF—CTMAB荧光熄灭法测定微量铁的研究

研究了领氟苯基荧光酮与铁（Ⅲ）的反应条件。在PH5.0-5.4的NaAc-HAc缓冲溶液中,在表面活性剂CTMAB存在下,铁（Ⅲ）与试剂生成配合物使试剂的荧光熄灭,建立了Fe(Ⅲ)-O-FPF-CTMAB体系测定微量铁的荧光光度新方法。荧光强度与Fe（Ⅲ）的含量在0-2.5ug/25mL范围内呈线性关系,方法的检出限为1.2μg/L。该方法灵敏度高,操作简便,用于自来水和人发样中微量铁的测定,结果满意。     

一种西夫碱化合物的合成及其在汞测定中的应用

合成一种新西夫碱2-氨基-5-巯基-1,3,4-噻二唑水杨亚胺(MTYMP),用常规法对其结构进行表征.该化合物在300 nm激发下,在410 nm处有强荧光峰,与汞离子可形成稳定的配合物而使其荧光猝灭.据此,该化合物可作为测定汞的荧光试剂,建立一个荧光猝灭测定微量汞的新方法,汞离子的含量在4.0~100.0μg·L-1范围内与试剂的荧光熄灭值呈线性关系,方法的检出限为0.315μg·L-1.该方法应用于废水中微量汞的测定,结果满意.     

CdTe/CdS量子点荧光探针测定痕量汞(Ⅱ)

在水溶液中合成巯基乙酸修饰的CdTe/CdS量子点(QDs),再基于Hg2+与CdTe/CdS量子点的荧光猝灭作用,建立用CdTe/CdS量子点作为荧光探针检测微量汞的新方法,并用该方法测定水中汞的含量。研究表明,pH值为6.24的磷酸缓冲溶液中,量子点浓度为3.75×10-4mol/L时,Hg2+离子浓度在2.3～150μg/L范围与CdTe/CdS量子点荧光猝灭强度呈良好的线性关系,相关系数为0.9985,检出限为0.87μg/L,回收率为99.0%～107.5%。该方法检测效果好,可用于实际样品分析。     

催化分光光度法测定痕量汞

研究了一种催化分光光度法测定痕量汞的新方法,该方法建立在汞能催化亚铁氰化钾分解生成F e2 ,生成的F e2 又与铁氰化钾反应生成蓝色胶体溶液的基础上的。其检出限为9.8×1-0 7g/L;线性范围为0~0.5μg/10 m l。     

微波消解氢化物原子荧光法测定海水蔬菜中的砷、汞

建立了一种微波消解处理样品,氢化物发生原子荧光光谱法同时测定海水蔬菜中微量砷、汞的方法.在优化的实验条件下,海水蔬菜中砷、汞回收率分别为96.0%、103.2%;检出限分别为0.24μg/L和0.17μg/L.并对方法的精密度和准确度进行评估,结果表明该方法用于海水蔬菜中砷和汞的同时测定是可行的.     

原子荧光光谱法测定汞、铅、锑的研究

建立了巯基葡聚糖凝胶分离富集-氢化物发生原子荧光法，用于测定汞、铅、锑的含量．采用微波消解样品，以巯基葡聚糖凝胶在不同的pH条件下分离富集汞、铅、锑，再以不同浓度的HCl洗脱后氢化物发生原子荧光光谱法测定含量．汞、铅、锑的线性检测范围分别为0～80，0～150，0～200／μg／L，方法检出限分别为0．05，0．30，0．25μg／L，样品加标回收率汞为99．0％～105．5％、铅为98．0％～101．5％、锑为99．8％～100．6％．本方法具有基体干扰小，灵敏度高，检出限低，线性范围宽的特点，应用于实际样品的测定，结果满意．     

新显色剂ABCPDT的合成及其与汞的显色反应

报道了新显色剂1偶氮苯3(5氯2吡啶)三氮烯(ABCPDT)的合成及其与汞的显色反应.在TX100表面活性剂存在下,pH为10～12的Na2B4O7NaOH缓冲溶液中,该试剂与汞发生显色反应,生成4∶1的红色配合物.配合物的最大吸收峰位于525nm,表观摩尔吸光系数为1.34×105L/(mol·cm).Hg2+在0～480μg/L范围内符合比尔定律.用拟定方法测定废水中微量汞,结果令人满意.     

显色剂ABCPDT的合成及在环境监测中的应用研究

报道了新显色剂1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯的合成及其与汞的显色反应。在表面活性剂TX-100存在下,pH11.5的Na2B4O7-NaOH缓冲溶液中,该试剂与汞发生显色反应,生成21型的红色配合物。配合物的最大吸收峰位于520nm,表观摩尔吸光系数为1.90×105L·mol-1·cm-1。Hg2 质量浓度在0~600μg/L范围内符合比尔定律。用拟定方法测定废水中微量汞,结果满意。     

荧光猝灭法快速测定环境水中痕量铬(Ⅲ)

在NH4C l-NH3.H2O缓冲溶液介质中铬(Ⅲ)能使荧光试剂水杨醛缩氨基硫脲荧光强度降低,降低的程度随铬(Ⅲ)含量的增加而增大,据此建立了测定痕量铬(Ⅲ)的荧光分析方法.其铬(Ⅲ)的量在20.0~260.0μg/L范围内与△F呈良好的线性关系,方法的检出限为:13.6μg/L,相对标准偏差为2.12%.该方法操作简便、反应迅速、灵敏度高,可直接用于自来水,池塘水及工业废水中铬(Ⅲ)的测定.     

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