ICP-AES法测定仲钨酸铵中微量硼

为了解决高纯仲钨酸铵中杂质元素硼的测定问题 ,采用ICP AES测定方法 ,对测定中基体效应及光谱干扰进行了研究 ,考察了酸度、蒸干程度、放置时间等因素对钨的沉淀程度及硼的回收率的影响 ;此外 ,将基体分离与干扰系数校正法相结合 ,建立了简便、快速、准确测定高纯仲钨酸铵中微量硼的新方法 .结果表明 :用该法测定硼的回收率大于 95 .8% ,测定仲钨酸铵中 0 0 0 0x%～ 0 0 0x%硼的相对标准偏差小于 3% ,其准确度及精密度均符合要求 ,能用于出口产品控制分析 .     

ICP-AES法同时测定高纯碳酸锂中11种杂质元素

研究了用ICP-AES法同时测定高纯碳酸锂中11种杂质元素Al、Ba、Cu、K、Na、P、Pb、Ca、Fe、Mg、Mn的分析方法.确定了方便快速测定高纯碳酸锂中11种杂质元素的条件.该方法的回收率为93.3％～107.2％,RSD小于6.1％.     

电感耦合等离子体光谱法测定高纯金中杂质元素的方法优化

以乙酸乙酯为萃取剂萃取分离高纯金中的杂质,采用电感耦合等离子体发射光谱仪测定其含量,并对萃取过程、测定方法及仪器条件进行了研究.测得被测杂质元素的检出限为0.000 02%~0.000 10%,回收率为93.1%~107.7%,相对标准偏差小于4%,结果令人满意.     

ICP-MS在高纯稀土氧化物分析中的应用

综述了1990～2006年问有关高纯稀土氧化物中痕量金属杂质电感耦合等离子体（ICP—MS）检测法的研究进展，内容包括ICP—MS应用中存在的主要问题、ICP—MS直接测定高纯稀土材料中痕量杂质以及分离技术与ICP—MS联用测定高纯稀土材料中痕量杂质技术。     

微量取样——火焰原子吸收法连续测定稀土化合物中的铜铅铁镍

作萤光粉用的氧化钇和氧化铕要求测定铜、铅、铁、镍等杂质的含量。我们曾建立了利用微量萃取和微量取样技术相结合测定高纯稀土氧化物中铜、铅、铁、镍的方法,但因作为制备高纯氧化物的原料或其它粗产品中杂质含量较高,需要建立适合于分析这类样品的简单、快速的分析方法。本文研究了用微量取样技术从少量稀土溶液中直接连续测定铜、铅、铁、镍的方法。此法的优点是:1,取样量少。这对于某些难得的贵重稀土(如铕)的分析是非常重要的;2.由于取样少,溶解样品所需的试剂少,溶     

ICP-AES测定高纯钨中杂质元素

采用电感耦合等离子体原子发射光谱法（即ＩＣＰＡＥＳ法）测定钨中的１４种杂质元素,并对１９种微量元素的基体效应和光谱干扰进行了研究,建立了ＩＣＰＡＥＳ与基体分离及干扰系数校正相结合的方法．此法解决了钨在分析测定时的基体干扰问题,能快速、准确、同时测定高纯钨中１４种微量元素,回收率高于９０％,相对标准偏差为１％～６％．它为钨产品的检测提供了新的切实可行的分析手段．     

阳极溶出伏安法同时测定高纯铟中的铅和镉

本文提出了一种在酒石酸铵—氨水体系中用阳极溶出伏安法同时测定高纯铟中痕量杂质铅和镐的新方法,工艺简单而且精密度高。不需预先和基体分离,在一定条件下对高纯铟样品进行测定．测定限铅可达1×10-1％．镉可达1×10－5％、铅、镉平均加标回收率均可达99％以上。     

水合肼还原高纯硝酸银的ICP-AES同时测定其9种杂质元素的方法研究

研究建立高纯硝酸银中杂质元素的简便而快速的分离、富集与测试方法在实践中具有重大意义.为解决以前存在的步骤烦琐问题,采用乙二胺四乙酸二钠盐(EDTA)作杂质元素的络合保护剂、氨水溶解硝酸银、水合肼还原沉淀除去硝酸银中的大量银,挥发氯化铵后用ICP-AES法直接测定主要杂质元素,建立了感光级高纯硝酸银中Bi、Cd、Fe、Cr、Ni、Mn、Cu、Pb、Pd同时快速ICP-AES测定法.实验结果表明:当上述元素含量高于50 ng/g时,回收率为92.4%～113.8%,相对标准偏差RSD小于3.2%,测定结果满意.     

矿石中铌钽的光谱分析

本文进行了花岗岩中铌钽的直接光谱测定。同时观察了基物组成改变对铌钽测定结果的影响。分析线对采用Nb2927.8A/Mo2930.5A及Ta2685.1A/Mo2683.2A.测定的浓度低限为0.03%(以氧化物计算)。均方误差铌为±11.0%(浓度0.1%)及±8.1%(浓度1%),钽为±15.9%(浓度0.1%)及±13.6%(浓度1%)。在花岗岩,石英,辉石,钾长石,方解石中观察了成分变化对铌钽测定的影响。最后用本方法进行了实物分析。     

X射线荧光光谱法熔融制样测定矿物中的铌钽

建立了一种准确度高,操作简便的铌钽矿物中铌钽含量的熔片X射线荧光光谱分析法。设计制备了标准样品,对仪器参数、稀释比等条件进行了优化,对干扰元素进行了谱线重叠校正和吸收增强校正。十次测量结果表明,Nb2O5相对标准偏差0.86%,Ta2O5相对标准偏差0.58%。对实际样品进行测定,测定结果与ICP法及化学法结果一致。     

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.     

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-