橙皮苷锌配合物合成及清除自由基能力的研究

以橙皮苷和锌金属盐为原料进行配合反应合成橙皮苷-锌配合物.以产率为指标,通过单因素和正交试验确定了合成橙皮苷一锌配合物的最佳条件为反应温度40℃,pH值10.0,反应时间45min,所得配合物产率迭72.50％.同时,通过橙皮苷和橙皮苷锌对DPPH·自由基、羟自由基(·OH)、超氧阴离子(O2-·)三种自由基的对比清除实验,证明了橙皮苷锌配合物清除自由基的能力强于橙皮苷.     

歧化松香胺席夫碱-铜配合物催化漆酚氧化聚合的研究

研究了歧化松香胺席夫碱-铜配合物的合成及其对漆酚氧化聚合反应的催化性能。用歧化松香胺和水杨醛反应,生成席夫碱,再与醋酸铜反应,制备席夫碱-铜配合物。讨论了该配合物作为催化剂,催化漆酚氧化聚合反应时,催化剂浓度、时间、底物浓度以及温度对漆酚氧化聚合反应的影响。结果表明,氧化聚合反应的理想条件是以乙醇为溶剂,加入3%歧化松香胺席夫碱-铜配合物催化剂,漆酚浓度为0.068 8 g/mL,在30℃下反应36 h后, 漆酚聚合物的沉淀得率为51.3%。     

萘酚醛席夫碱铜配合物的合成、表征及荧光性质

采用色胺与2-羟基-1-萘甲醛缩合反应合成萘酚醛席夫碱,通过溶剂扩散法将该萘酚醛席夫碱与二水合氯化铜反应,培养出萘酚醛席夫碱铜金属配合物晶体.对该萘酚醛席夫碱及其铜金属配合物进行核磁共振、红外光谱及X-射线单晶衍射等表征,确定铜配合物结构为两分子萘酚醛席夫碱中酚羟基的氧原子和亚胺基的氮原子与铜离子配位,形成四配位的平面...     

铜(Ⅱ)-甲基咪唑配合物的合成、结构表征及其在ATRP中的催化活性

以甲基咪唑为配体,合成铜(Ⅱ)-甲基咪唑配合物,并通过元素分析、红外光谱、DSC等进行分析表征.将该配合物作为催化剂成功地进行了MMA的ATRP反应,和苯乙烯的嵌段聚合,证实该化合物作为ATRP催化剂具有催化活性.     

柚皮素与过渡金属铜（Ⅱ）离子的配位反应

利用配体和配合物在配位反应前后紫外吸收的不同,采用单因素实验法探讨了柚皮素与过渡金属铜（Ⅱ）离子在乙醇溶液中的最佳反应条件,考察了碱、不同阴离子的铜盐、配位比及温度对配位反应的影响.在最佳反应条件下成功合成了柚皮素-铜配合物,并用红外光谱和紫外光谱对配合物进行了表征.结果表明,碱是影响柚皮素与铜离子配位反应活性最明显的因素.最终确定了柚皮素与铜盐配位反应的最佳条件为：碱选用无水碳酸钠,铜盐选用氯化铜,氯化铜与柚皮素的配位比为0.75∶1.0,温度为60℃.     

炔双膦配体和二亚胺类配体混配的一价铜双核配合物的合成与表征

以炔双膦配体和二亚胺类配体为共配体,与四乙腈一价铜盐反应,最终合成了4种新颖的一价铜双核配合物,产率为35%～50%.进一步对其中2种配合物的晶体学结构进行表征,并测试了配合物的紫外吸收光谱和固体发光性能.这4种铜配合物均具有固体发光现象,其中配合物4c的发光性能最好,是一种潜在的固体发光材料.     

手性Cu(Ⅱ)配合物催化的不对称环丙烷化反应的研究

以1,1’一联萘-2,2’-二胺为手性源合成了6种光学活性铜配合物,考察了它们对1,1－二苯乙烯的不对称环丙烷化反应的光学诱导活性．结果表明,以旋光活性联萘胺和吡啶-2-甲醛缩合而得到的Schiff碱为配体的铜配合物的催化效果最佳,光学产率达36.5%．     

羟胺类Schiff碱及Cu(II)配合物的合成、表征与抑菌活性研究

采用香草醛、水杨醛和对羟基苯甲醛,以无水甲醇为溶剂,分别与盐酸羟胺反应,合成羟胺类Schiff碱配体,并用3种配体与乙酸铜(Ⅱ)合成配合物.通过元素分析、红外光谱、质谱、紫外-可见光谱、电导和热分析等测试手段对化合物进行了表征,确定了组成.同时,对Schiff碱配体及其相应配合物进行了抑菌活性实验,结果表明:配体和Cu (Ⅱ)配合物对大肠杆菌、枯草杆菌和八叠球菌均有一定的抑制作用,而且配合物比相应配体的抑菌活性强,其中水杨醛缩盐酸羟胺合铜对枯草杆菌抑菌效果最佳.     

新型手性Schiff碱配体及其铜（Ⅱ）配合物的设计、合成与表征

Schiff碱金属配合物不仅具有抑菌、杀菌、抗肿瘤、抗病毒等方面的重要应用,而且在催化领域具有广泛的应用前景.本文以价康、易得的葡萄糖为起始原料,经多步反应高产率地合成出了一类新型手性Schiff碱及其铜(II)配合物,用IR,1H NMR对手性Schiff碱及其铜(Ⅱ)配合物进行了结构表征.到目前为止,该类手性Schiff碱铜(Ⅱ)配合物合成研究尚未见文献报道.     

一种新方法合成吡嗪甲酸根合铜(Ⅱ)配合物

文章介绍了一种合成二水吡嗪甲酸合铜配合物[Cu(CPY)_2(H_2O)_2](CPY=吡嗪-2-甲酸根)的新方法,用吡嗪二甲酸为起始原料与二水乙酸合铜反应得到二水吡嗪甲酸合铜配合物,合成了以吡嗪-2-甲酸根为配体的单核铜(II)配合物[Cu(CPY)_2(H_2O)_2].对该配合物进行了元素分析表征,并对其进行了X-射线单晶结构测定.该单晶属于单斜晶系,空间群为P 2(1)/c,其晶胞参数为α=5.4447(11)(A)、alpha=90 deg;b=10.894(2)(A)、beta=98.23(3)deg、c=10.386(2)(A);gamma=90 deg,Volume=609.7(2)(A)3.     

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