三氯偶氮胂直接光度法测定金属材料中铈组稀土元素

研究了三氯偶氮胂在盐酸－草酸介质中与钢铁及合金材料中铈组稀土元素的显色反应。试验表明，在盐酸（２Ｍ）－草酸（０．０８Ｍ）介质中，铈组稀土元素与三氯偶氮胂形成稳定的络合物。其最大吸收波长λｍａｘ＝６３０ｎｍ，表现摩尔吸光系数ε＝１．１×１０４Ｌ／ｍｏｌ·ｃｍ，铈组稀土元素与三氯偶氮胂的络合比为１：２。用本法测定了球墨铸铁、合金钢、铝合金、镁合金和钴合金等金属材料中的铈组稀土元素，其结果令人满意。     

用紫外分光光度法快速测定棉籽饼提取液中的蛋白质含量

探讨了紫外分光光度法，快速测定棉籽饼提取液中的蛋白质含量。结果表明当波长在１９２ｎｍ，质量浓度在（１．０～０．１）ｍｇ／Ｌ的范围内进行测定时，仅需４０ｍｉｎ就可以得到准确度能满足中控分析要求的结果。     

对氟偶氮氯膦分光光度法测定茶叶中的稀土总量

利用对氟偶氮氯膦（ＣＰＡ－ｐＦ）与稀土元素的显色反应，建立了测定茶叶中稀土总量的测试方法，该方法对单一稀土元素的表观摩尔吸光系数为５．９～８．０×１０４Ｌ／（ｍｏｌｃｍ）．最大吸光波长范围为６６２～６６６ｎｍ．采用包头稀土氧化物比例制作的工作曲线，对两种国家标准物质中稀土总量的测定误差小于±５％．     

双显色剂双波长分光光度法同时测定氮化硅中铁和铝

以铬天青Ｓ和邻菲啉作混合显色剂，不需预分离，可用双波长分光光度法同时测定氮化硅消解液中的铁和铝。［Ｆｅ（ｐｈｅｎ）３］２＋和Ａｌ（ＣＡＳ）３的吸收光谱有部分重叠，通过读取在两个等吸收波长处的吸光度可消除吸收干扰，测铁所选的波长对为５０４／５９５ｎｍ，测铝的波长为［Ｆｅ（ｐｈｅｎ）３］２＋不产生吸收的５８１ｎｍ．测量在ｐＨ＝６．０的ＨＡＣ－ＮａＡＣ缓冲溶液中进行。测铁的线性范围为０～４ｍｇ／Ｌ，测定值的相对标准偏差为０．８１％，平均回收率为９９．７％；测铝的线性范围为１．４ｍｇ／Ｌ，测定值的相对标准偏差为２．３１％，平均回收率为１０１．１％。     

氧化铝矿混合捕收剂的HPLC测定及其协同作用

对氧化铝矿浮选药剂钢铁灵、苯甲羟肟酸的高效液相色谱分离和测定进行了研究，并建立了最佳色谱体系：固定相ＮＵＣＬＥＯＳＩＬＯＤＳ（５μｐ），２００ｍｍ×４ｍｍ；流动相为合１．８×１０－４ｍｏｌ／Ｌ的ＫＨ２ＰＯ４，甲醇与水的体积比为７０／３０，ｐＨ为２．５０；开发了检测器的波长切换技术，分别在２３０ｎｍ和２８５ｎｍ波长下测定苯甲羟肟酸和铜铁灵的吸光值，两者的检出限分别为０．００６ｍｇ／Ｌ和０．００５ｍｇ／Ｌ；线性范围分别为０．２～２００ｍｇ／Ｌ和０．６～３００ｍｇ／Ｌ·同时，借助该方法对铜铁灵、苯甲羟肟酸浮选ＰｂＳＯ４的协同作用机理进行了研究．     

5‘—硝基水杨基荧光酮荧光猝灭法测定微量锡

基于Ｓｎ－５‘－硝基水杨基荧光酮－Ｔｗｅｅｎ－８０体系的荧光猝灭效应，提出一种测定微量锡的新荧光分析方法。在０．８－１．２ｍｏｌ／Ｌ的硫酸介质中，在Ｔｗｅｅｎ－８０存在下，锡与５’－Ｎ－ＳＡＦ形成摩尔比为１：４的橙红色络合物。该体系存在两个激发峰，其激发波长分别为λｅｘ１＝４７５ｎｍ，λｅｘ２＝５０５ｎｍ，发射波长λｅｍ＝５２５ｎｍ。     

近红外荧光探针法测定核酸的研究

以阳离子花菁染料为荧光探针, 依近红外荧光猝灭测定核酸． 最大激发及发射波长分别为７６５ 、７９０ｎｍ ． 核酸测定的线性范围为０－０８ ～１－２μｇ／ｍ Ｌ（ＣＴＤＮＡ 及ＳＭ ＤＮＡ） , ０－１ ～１－６μｇ／ｍＬ（ｙｅａｓｔ ＲＮＡ） ．     

吸光度线性扩展法测定镨钕钐

用吸光度线性扩展法测定镨、钕、钐．基于待测元素特征吸收峰下的吸光度在纪录仪上线性放大，提高了测定的灵敏度、准确度，扩大了测定浓度范围．分别选用的最大吸收波长是：λＰｒ＝４４４．７ｎｍ，λＮｄ＝７９４．２ｎｍ，λＳｍ＝４０１．７ｎｍ；吸光度相应峰高和浓度呈线性关系的范围是：Ｐｒ３＋为（０．２０～８．６）×１０－６ｍｏｌ／Ｌ；Ｎｄ３＋为（０．２０～２．４）×１０－６ｍｏｌ／Ｌ；Ｓｍ为（０．２０～３．０）×１０－５ｍｏｌ／Ｌ．在选用１０ｃｍ比色皿时，测定灵敏度为：Ｐｒ３＋为１．１μｇ／ｍｌｍｍ，Ｎｄ３＋为０．２２μｇ／ｍｌｍｎ，Ｓｍ３＋为４．６μｇ／ｍｌｍｍ．待测元素与稀土杂质浓度比为５１时无干扰，１１时只有个别元素有一定干扰．     

荧光素荧光法测定痕量硫氰酸根的研究

报道了以荧光素为指示剂,荧光法间接测定痕量ＳＣＮ－的新方法．在ｐＨ＝５．５～７．５的中性缓冲溶液中,Ｉ２与荧光素反应,使荧光素的荧光猝灭．当加入ＳＣＮ－时,ＳＣＮ－和Ｉ２反应使体系荧光增强,该体系激发波长、发射波长分别为４９４ｎｍ和５１５ｎｍ,ＳＣＮ－含量在１．０～６０μｇ／Ｌ范围内呈良好的线性关系,检测下限为１．０μｇ／Ｌ．该方法灵敏度高,选择性好,用于吸烟人和非吸烟人唾液中痕量ＳＣＮ－测定,结果令人满意．     

二苯乙烯荧光蓝-S荧光猝灭测定微量锌(Ⅱ)

研究了二苯乙烯荧光蓝－Ｓ荧光猝灭测定微量锌（Ⅱ）的实验条件．在ｐＨ６．０的Ｈ３ＰＯ４－Ｈ３ＢＯ３－ＨＡｃ－ＮａＯＨ缓冲溶液中，试剂的最大激发波长λｅｘ＝３６７ｎｍ，最大荧光发射波长λｅｍ＝４５７ｎｍ；Ｚｎ（Ⅱ）与试剂生成的１∶２的配合物使试剂的荧光强度减弱；利用荧光猝灭法测定微量锌（Ⅱ），线性范围为０～０．８μｇ／１０ｍｌ；方法用于测定食品中、人发中的微量锌（Ⅱ），结果满意．     

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.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the