N,N-二壬基氨基乙酸从盐酸溶液中萃取铑(Ⅲ)的机理

N,N-二壬氨基乙酸(DNG)在盐酸介质中萃取铑(Ⅲ)的低价配阴离子。运用最小电荷密度原理和氢键作用解释了铑(Ⅲ)配阴离子的萃取顺序。通过考察萃取平衡、萃取动力学和萃合物的电子光谱,提出DNG萃取铑(Ⅲ)的机理为两相界面快速的阴离子交换和有机相内缓慢的配体取代。     

铑(Ⅲ)-溴酸钾-偶氮胂Ⅲ褪色光度法测定微量铑的研究

报道了以铑(Ⅲ)催化溴酸钾氧化偶氮胂Ⅲ的褪色反应,建立了水相中直接测定微量铑的催化光度分析法.铑含量在1.0～30.0μg·L-1范围内符合比耳定律,测定限1.0μg·L-1.用于铂 铑催化剂的测定,结果满意.     

低压合成丁醛中微量铑的示波极谱测定

本文用pH为6-70.5M的氯化钠—磷酸缓冲液为底液,测定铑(Ⅲ)—E.D.T.A络合物在示波极谱上还原的性质及其影响因素,确定了测定铑(Ⅲ)的最佳条件,铑(Ⅲ)浓度从0—45ppm与峰电流呈线性关系,可用于微量铑的定量分析。用硝酸—过氧化氢湿法氧化及亚硝酸钠分离干扰的方法对合成丁醛的样品及催化剂进行前处理,用上述方法测定,并与比色法、重量法进行对照,结果一致。     

铑-钨酸盐-番红花T缔合显色反应的研究及应用

在聚乙烯醇(PVA)存在下,铑(Ⅲ)与钨酸盐及番红花T(ST)形成的离子缔合物在480nm处产生最大吸收.据此建立了测定铑(Ⅲ)的光度分析方法,其表观摩尔吸光系数ε达108L·mol-1·cm-1数量级.方法的检测范围为0.15～1.5 ng/25ml.大量存在的常见离子对Rh(Ⅲ)的测定不干扰.用此方法测定了催化剂及工业产品中铑的含量,结果与标准方法(SnCl2法)一致.     

铑(Ⅲ)-5-Br-PADMA-四丁基溴化铵体系的极谱催化波研究及其应用

报道在阳离子表面活性剂四丁基溴化铵(TBAB)存在下,铑(Ⅲ)-2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺体系的极谱催化波.在单扫示波极谱仪上,铑(Ⅲ)与5-Br-PADMA在—1.16V处能产生一灵敏的极谱催化波.加入四丁基溴化铵后,波形得到改善,灵敏度明显提高,铑(Ⅲ)浓度在9.7×10~(-10)～1.2×10~(-6)mol/L范围内与一阶导数波高成线性关系,检测限达7.8×10~(-10)mol/L.并采用多种电化学方法研究了该体系极谱波性质,结果表明属于氢催化波,此法已应用于一些样品中痕量铑(Ⅲ)的测定.     

铑(Ⅲ)-溴酸钾-二溴邻硝基偶氮胂催化分光光度法测定微量铑

以铑(Ⅲ)催化溴酸钾氧化二溴邻硝基偶氮胂的褪色反应,建立了一种在水相中直接测定微量铑的催化光度分析法.铑含量在0.0-20.0μg.L-1范围内符合比耳定律.用于铂-铑催化剂中铑的测定,结果令人满意.     

铑(Ⅲ)-溴酸钾-二溴硝基偶氮氯膦褪色光度法测定微量铑

报道了以铑(Ⅲ)催化溴酸钾氧化二溴硝基偶氮氯膦的褪色反应,建立了一种在水相中直接测定微量铑的催化光度分析法.铑含量在0.0～12.0μg·L-1范围内符合比耳定律.用于铂铑催化剂中铑的测定,结果满意.     

铑(Ⅲ)-溴酸钾-二溴羧基偶氮胂催化分光光度法测定微量铑

报道了以铑(Ⅲ)催化溴酸钾氧化二溴羧基偶氮肿的褪色反应,建立了一种在水相中直接测定微量铑的催化光度分析法.铑含量在0.0～10.0μg·L-1范围内符合比耳定律.用于铂-铑催化剂中铑的测定,结果满意.     

铱、铑的萃取色层分离

本文研究了铱(Ⅳ)、铑(Ⅲ)在N_(235)萃取色层柱上的色层分离,考查了洗脱液组成、温度、流速对色谱峰峰位体积和峰宽的影响。采用IN HCI—3N HCI洗脱铑(Ⅲ)、5N HNO_3—1N HCI洗脱铱(Ⅳ),可以满意地实现两者的分离,十次平行实验的平均结果为:铑囘收率99.84±1.04％、纯度>99.5％,铱囘收率98.74±2.26％,纯度>99.9％。     

铑（Ⅲ）-高碘酸钾-偶氮胭脂红B催化光度法测定痕量铑的研究与应用

在硫酸和热水浴中,Rh(Ⅲ)催化高碘酸钾氧化偶氮胭脂红B褪色,由此建立了测定铑的新催化光度法.铑质量浓度在0～1.1μg/25mL范围内符合比尔定律,检出限为4.08×10-9g/mL.对1.0μg/25mL Rh(Ⅲ)测定的相对标准偏差为2.20%(n=11).催化反应的表观活化能为100.38.KJ/mol.考察了40多种共存离子的影响,Os(Ⅳ)、Ru(Ⅲ)和Ir(Ⅳ)干扰,其它贵金属、有色金属和铁不干扰.题示体系已用于某些催化剂和冶金产品中痕量铑的测定,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.     

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-