一种CTP用红外吸收菁染料的合成

在热敏CTP(computer-to-plate)版材中,染料在曝光时会把光能转化成热能,使产酸源迅速产酸,从而使两种酚醛树脂在酸的催化作用下迅速交联.因此染料的热转化率会直接影响到版材的性能.本文介绍了在我实验室所用染料的基础上进一步合成出吸收在830 nm的另一种菁染料,确证了其吸收峰,并将其应用于热敏CTP版材,证明版材的敏度得到提高.     

新型热敏染料的研究

基于内酯环类热敏染料的热变色性，通过分子设计和结构修饰，将显色性功能基团连接在内酯环荧烷母体上合成新型的热敏染料，达到同样的效果，并用紫外、红外等光谱探讨热变色机理，研究表明，低温时，内酯环呈开环的状态，具有共轭结构，显示一定的颜色，高温时，因溶剂化作用分子闭环，共轭结构消失而消色，该热敏染料表现出较好的热变色可逆性。     

卟啉材料在激光防护上的应用

研究卟啉材料的激光防护特性.基于卟啉-蒽化合物的分子结构特点及其光子吸收截面计算公式,研究了卟啉-蒽化合物的双光子和三光子吸收特性.结果表明,卟啉-蒽化合物具有很好的非线性光学吸收效应,其光学吸收谱可以覆盖很宽的波长范围,这种非线性光学吸收效应可以用于抵御不同波长激光武器的攻击.     

一种基于肟的对次氯酸根离子的高效比色和荧光的化学传感器的合成和性质研究

次氯酸作为一种不稳定的弱酸,在日常生活中被广泛应用;而作为一种重要的活性氧物种,在众多生理和病理的过程中也发挥着至关重要的作用.本文中设计、合成以蒽为荧光发色基团,以肟为识别基团的对ClO~-高效选择性识别的荧光传感器S.传感器S对ClO~-有很好的选择性识别能力,而且其他大部分的ROS活性氧簇离子对次氯酸根离子的测定也无干扰,该探针分子对ClO~-有很快的响应速度,在2 min左右即可完成,而且探针分子S对ClO~-的检测限DL达到6.37×10~(-7)mol/L.     

比色法测定葡萄酒中酒石酸的条件试验

采用比色法测定葡萄酒中酒石酸的含量,并对其吸收曲线、发色曲线、显色剂用量、醋酸的添加量,显色剂保存期、其它几种有机酸的影响以及回收率等条件做了较详细的介绍。     

基因决定你的发色

正基因决定发色,这点我们早就知道了。此前的研究已经发现了13个与发色有关的基因。但一项于2018年4月16日发表在Nature Genetics上的研究却一口气新发现了一百多种能决定发色的基因。与原有的法医测试相比,新的遗传标记能将发色辨别的准确度再提     

复极性固定床电解槽对水溶性染料的电解脱色研究

就复极性固定床电解槽（ＢＰＢＣ）对水溶性染料的电解脱色进行了较系统的实验研究。结果表明，ＢＰＢＣ通过电氧化还原作用可以破坏偶氮、蒽醌、三芳甲烷、杂蒽类、酞菁和金属络合各类染料分子结构中的发色共轭体系，而使染料降解脱色；ＢＰＢＣ电解可去除酞菁染料和金属络合染料分子结构中的螯合态重金属（铜或铬）；ＢＰＢＣ电解还具有脱氮作用；染料的分子结构及其空间构型对其电解行为有影响。     

β—谷甾醇等化合物对昆虫整体糖原含量的影响

采用“蒽酮法”，就β－谷甾醇（β－sitosterol）、瑞香亭（daphnoritin）以及狼毒色原酮（chamechromone）3种化合物对菜粉蝶（Pieris rapae L.）5龄幼虫整体糖原含量进行了测定。结果表明：24h后，β－谷甾醇对其整体糖原影响最明显；48h后，β－谷甾醇与狼毒色原酮对其影响最明显。     

可熔性酚醛树脂的合成及其在热交联CTP版材中的应用

文中仅用一种可熔性酚醛树脂制得通常需用两种酚醛树脂才能制得的热交联CTP版。研究了合成反应条件对可熔性酚醛树脂的相对分子质量和羟甲基指数的影响及该版材的热敏涂层配方。结果显示适合于这种体系的可熔性酚醛树脂的羟甲基指数为3左右,固有黏度为8左右;热敏涂层最佳配方为m(可熔性酚醛树脂)∶m(二苯基碘盐)∶m(红外吸收染料)=1∶0.31∶0.26。     

热透镜检测多环芳烃蒽过程中的荧光去除研究

讨论了热透镜技术对紫外光作用下能产生荧光的物质多环芳烃蒽的检测，以蒽的苯－乙醇（1：4）溶液为研究体系，选用CH3I作为荧光淬灭剂，得出了淬灭后热透镜信号与蒽的浓度值之间良好的线性关系，论证了热透镜技术对蒽的浓度测定的可行性。从理论上计算了使用淬灭剂淬灭光的方法所增加的热透镜信号比例，它与体系的荧光量子产额有重要联系，研究中还得到一种测量荧光量子产额的简便方法。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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