三氮烯试剂合成的新方法

在稀盐酸的存在下,以亚硝酸正丁酯为重氮化试剂,合成出4,4’-二偶氮苯重氮氨基苯、1,3-二-(4-硝基苯)-三氮烯、安替比林重氮氨基苯及1-(4-安替比林)-3-(4-硝基苯)-三氮烯.该重氮化反应效果好,合成产品的纯度高,产率也较高.     

1-(4-硝基苯基)-3-(4-安替吡啉基)-三氮烯的合成

通过重氮盐的氮偶联反应,合成三氮烯类新试剂.质谱、红外光谱和核磁共振数据证实产物为1-(4-硝基苯基)-3-(4-安替吡啉基)-三氮烯.     

1-(2-萘酚-4-磺酸)-3-[4-(苯基偶氮)苯基]-三氮烯合成及与阴离子表面活性剂的显色反应

合成了新试剂1-(2-萘酚-4-磺酸)-3-[4-(苯基偶氮)苯基]-三氮烯(NASAPAPT),研究了该试剂与阴离子表面活性剂(AS)十二烷基硫酸钠、十二烷基苯磺酸钠的显色反应的条件.试剂和十二烷基硫酸钠、十二烷基苯磺酸钠形成配合物的最大吸收分别位于441nm和432nm,表观摩尔吸光系数为1.51×104 L.mol-1.cm-1和2.29×104 L.mol-1.cm-1.建立了水相测定微量阴离子表面活性剂的新方法,方法已应用于合成水样及环境水样中阴离子表面活性剂的测定.     

1-(4-硝基苯基)-3-(4-安替吡啉基)-三氮烯分光光度法测定痕量银

在新三氮烯试剂1-(4-硝基苯基)-3-(4-安替吡啉基)-三氮烯与银配位反应的基础上,建立了更灵敏和选择性更好的测定银离子的分光光度方法.结果表明,反应摩尔吸光系数为1.26×105L/(mol.cm),最大吸收波长为530 nm,银量在0～460μg/L范围内符合比尔定律.对显影废液中的痕量银离子进行测定,结果令人满意.     

聚丙烯酰基苯并三氮唑的合成及其反应的研究

本文用丙烯酰氯与苯并三氮唑反应,合成了丙烯酰基苯并三氮唑(ABT),并通过聚合反应合成了聚丙烯酰基苯并三氮唑(PLABT)。以红外光谱、元素分析确定了单体与聚合物的结构,讨论了PLABT与芳香胺、氨基酸的功能化反应。     

1—（4—磺基苯）—3—（2—噻唑）—三氮烯新显色剂的合成及应用

用一种新的三氮烯类显色剂，１－（４－磺基苯）－３－（２－噻唑）－三氮烯（ＳＰＴＴ）的合成方法，探讨试剂的分析性能，着重研究了试剂与钯（Ⅱ）的显色反应条件。     

2-羟基-4-磺酰氨基苯-3-(4-硝基苯)-三氮烯的合成及与镉的显色反应

合成了新的三氮烯试剂--2-羟基-4-磺酰氨基苯-3-(4-硝基苯)-三氮烯,并研究了其在Triton X-100表面活性剂存在下与镉的显色反应.在pH=11.0～12.0的Na2B4O7-NaOH缓冲溶液中,该试剂与镉形成3:1型浅黄色配合物,配合物的最大吸收峰位于λ=535 nm处,表观摩尔吸光系数为1.46×105L·mol-1·cm-1,ρ(Cd2 )在0～480μg/L时符合比尔定律.用拟定方法测定废水中的微量镉,结果满意.     

试剂的合成及应用 Ⅰ.四种三氮烯类新显色剂的合成及对其性质的研究

本文报道了四种三氮烯类新显色剂的合成与纯化方法,以及这些试剂在TritonX—100存在下与Cd(Ⅱ)的显色反应。实验表明:显色介质的酸度对试剂与Cd(Ⅱ)的显色反应影响很大,在最佳显色pH值下,试剂Ⅰ—Ⅳ都能与镉形成稳定的红色配合物,其最大吸收波长位于500nm左右,摩尔吸光系数都在1.0×10~5l·mol~(-1)·cm~(-1)以上。     

新试剂1-(偶氮苯基)-3-(4,5-二甲基-2-噻唑)-三氮烯的合成及其与镉的显色反应研究

报道了新试剂 1 (偶氮苯基 ) 3 ( 4 ,5 二甲基 2 噻唑 ) 三氮烯 (ABDMTT)的合成及其与镉的显色反应。在Tween -80存在下 ,PH1 1 .0的缓冲介质中 ,ABDMTT与Cd(Ⅱ )形成 3 :1的红色配合物 ,试剂与配合物的最大吸收波长分别为 43 0nm和 5 1 8nm ,表观摩尔吸光系数为 1 .69× 1 0 5L/moL·cm。Cd(Ⅱ )量在 0～ 1 2 μg /2 5mL范围内符合比尔定律。用拟定方法测定了地面水中镉的含量     

1-(3-硝基苯基)-3-(4-硝基苯)-三氮烯合成及与阳离子表面活性剂的显色反应

合成了1-(3-硝基苯基)-3-(4-硝基苯)-三氮烯(NPNPT),研究了该试剂与阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)显色反应的条件。试剂和十六烷基三甲基溴化铵(CTMAB)形成配位比为1∶1的深红色配合物,配合物的最大吸收位于590nm,表观摩尔吸光系数为9.9×103L.mol-1.cm-1,建立了水相测定微量阳离子表面活性剂的新方法,方法已应用于合成水样中阳离子表面活性剂的测定。     

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.     

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