2-(2′-羟基苯基)苯并咪唑类衍生物的合成及荧光性质

合成了4种2-(2′-羟基苯基)苯并咪唑类衍生物,并对其结构进行了表征;研究了衍生物的荧光性质及互变异构体对荧光量子产率的影响;探讨了不同的取代基对荧光性质的影响,得出吸电子取代基使荧光量子产率减小的结论.     

新型碱性磷酸酶荧光分子探针合成及光谱性质

合成了以2-(2-羟基苯基)苯并咪唑作为荧光发射团的新型碱性磷酸酶荧光分子探针.苯并咪唑基苯基磷酸二钠盐,利用质谱、红外光谱、核磁共振谱对其结构进行了表征,研究了与碱性磷酸酶反应前后的光谱变化.荧光发射团的激发波长为316 nm ,荧光发射波长为460 nm,激发光与发射光基本不重叠,大大提高了碱性磷酸酶测定的准确性.     

对羟基苯乙烯苯并咪唑盐的合成及荧光性质

合成了一种新的苯并咪唑衍生物：1，3-二甲基-2-对羟基苯乙烯基苯并咪唑碘盐，通过元素分析、紫外可见光谱、红外光谱、核磁共振谱及质谱对其结构进行了表征。测定了题头化合物在水溶液中的荧光光谱，讨论了在室温下pH值对其荧光性质的影响，发现题头化合物在pH=7．00时，荧光强度最大。     

三价锰存在下2-(1H-苯并咪唑-2-基)-苯酚及其衍生物的合成与其光谱特性

研究在三价锰的作用下，在室温下用2-羟基芳香醛和1，2-二胺合成2-（1H-苯并咪唑-2-基）苯酚及其衍生物的反应，并对其荧光特性进行了分析．所合成的全部化合物的荧光光谱均在甲醇中进行测定．     

羟基二芳基希夫碱及其在 银纳米颗粒作用下的荧光性能

为了探索羟基二芳基希夫碱及其在银纳米作用下的荧光性能,本文合成了60个羟基二芳基希夫碱化合物,并制备了银纳米溶液.这些化合物包含羟基处于芳环的4-,3-,2-,2'-和4'-不同位置的异构体.将化合物配制成无水乙醇溶液,测定了纯化合物溶液的荧光光谱以及化合物-银纳米溶液的荧光光谱.结果表明:(1)化合物溶液的荧光发射波长与羟基所处的位置密切相关,处于醛芳基2-位羟基的化合物荧光发射波长最长;(2)化合物在银纳米作用下,荧光发射波长均有移动,其移动的大小与取代基电子效应没有明显的定量相关性;(3)荧光发光强度相对于纯化合物,普遍发生了降低,仅有极少数化合物有增强.该结果对希夫碱荧光材料的设计合成有理论意义,同时对银纳米用于有机化合物和生物检测有参考价值.     

多羟基1,2-二取代苯并咪唑的选择性合成和抗氧化性质研究

苯并咪唑衍生物是一类具有多种生理活性的化合物,在医药学中应用广泛.化合物分子中含有羟基会有助于提高其对自由基的清除能力.但是在传统合成路线上,对于羟基等易氧化基团需在合成过程中先对羟基进行保护.采用一步合成实现了多羟基取代的1,2-二取代苯并咪唑类化合物的合成,对合成出的1,2-二取代苯并咪唑类化合物进行了抗自由基活性研究.在ABTS、DPPH自由基清除实验中,多羟基取代的1,2-二取代苯并咪唑都显示出了较好的活性.     

2-胺基-1-芳基-1-烷醇类化合物的新合成法及其乙酰胆碱酯酶抑制活性

研究2-胺基-1-芳基-1-烷醇类化合物的合成及其乙酰胆碱脂酶抑制活性。在室温下,利用Pd/C(H2)还原硝基醇高收率地得到胺基醇化合物,并对其进行乙酰胆碱脂酶抑制活性测定。设计、合成了10个目标化合物并经1H NMR1、3C NMR进行结构确证。除化合物2-胺基-1-(3,4,5-三羟基苯基)-1-乙醇外,其它化合物对乙酰胆碱脂酶没有抑制活性。提供了一种合成2-胺基-1-芳基-1-烷醇类化合物的新方法。2-胺基-1-(3,4,5-三羟基苯基)-1-乙醇显示了一定的生物活性,其结构优化工作值得进一步研究。     

2-甲基-4′-甲氧基-7-(2-(1-(2-甲基苯并咪唑基))乙氧基)异黄酮的合成及抗氧化活性研究

以对甲氧基苯乙酸和间苯二酚为原料,经5步反应合成了一种新的苯并咪唑类异黄酮衍生物--2-甲基-4′-甲氧基-7-(2-(1-(2-甲基苯并咪唑基))乙氧基)异黄酮.其结构经过IR,1H NMR,13C NMR,元素分析确证.番红花红T-Mn2+-H2O2体系对目标化合物的抗氧化活性研究表明,目标化合物具有较强的清除羟基自由基能力.     

4-氨基-3,5-二（2-羟基苯基）-1,2,4-三唑的合成、表征及其光物理性能

为探索1,2,4-三唑衍生物的合成及光物理性能,通过改进的双酰肼环化法合成了4-氨基-3,5-二(2-羟基苯基)-1,2,4-三唑,分别讨论了反应物的投料比、反应温度、反应时间及催化剂对产率的影响;对目标化合物进行了IR,1H NMR,MS和元素分析等表征,并测试了其紫外、荧光,探讨了光物理性能.     

2-(5-氨甲基-2-羟基苯基)苯并咪唑的合成及荧光性质研究

以水杨醛为初始原料,通过羟甲基化、与邻苯二胺成环、氯甲基化、Gabriel反应制备了2-(5-氨甲基-2-羟基苯基)苯并咪唑,用核磁、红外对中间产物及目标产物进行了结构表征,并研究了各中间产物及目标产物的荧光性质,结果表明目标产物具有较高的荧光量子收率和较大的斯托克斯位移.     

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-