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.     

一种色氨酸修饰的香豆素类Cu2+荧光探针的合成及性能研究

摘要:本文设计、合成了一种色氨酸修饰的香豆素类荧光探针香豆素色氨酸甲酯,它以色氨酸基团作为金属离子的识别位点、以香豆素基团作为荧光信号基团.实验结果表明:在水溶液中该探针能够对Cu2+表现出荧光猝灭效应,而相同测试条件下其他重金属离子的加入对探针的荧光发射几乎没有影响,因此该探针对Cu2+表现出选择性识别作用.     

双丹酰基组氨酸作为Fe3+荧光探针的研究

以丹磺酰基为荧光基团、以组氨酸为识别基团,设计并合成了一种识别Fe3+的双丹酰基组氨酸(DHD)荧光探针.通过核磁共振波谱、质谱、紫外-可见吸收光谱、荧光光谱等对产物进行了表征和识别性能的研究.结果表明:探针分子能够在水溶液中以物质的量1 : 1的结合比荧光识别Fe3+,表现出高灵敏度和高选择性,且具有很强的抗离子干扰能力和荧光恢复能力.     

基于多孔硅的Hg~(2+)荧光化学传感器

通过电化学腐蚀的方法制备发橙色荧光的多孔硅,采用荧光光谱和透射电镜对制备的多孔硅进行表征.结果表明,其在空气中放置时,荧光会逐渐降低,直至完全消失.进一步对其透射电镜图片进行分析认为,令其发光的根本原因是多孔硅内部存在着单晶的硅晶粒.通过热反应和光反应两种方法在多孔硅表面引入Hg2+识别基团,得到多孔硅化学传感器S1和S2.二者均可实现对Hg2+的选择性识别.     

一种可富集Fe3+的含芘荧光探针

以芘为荧光发射基团、以邻氨基苯甲酸基团为识别基团,设计、合成了一种对Fe3+特异性响应的荧光探针芘甲酰邻氨基苯甲酸(PAA).利用氢核磁共振波谱、质谱表征其结构,通过紫外-可见吸收光谱以及荧光发射光谱研究其对Fe3+的响应性能.结果表明:PAA对Fe3+具有高选择性、高抗干扰性的荧光响应.随着Fe3+浓度的升高,探针的荧光强度逐渐减弱,同时伴随大量Fe3+螯合物沉淀的析出,从而使Fe3+从体系中富集出来,且在4倍浓度干扰离子存在的体系中,PAA对Fe3+的识别能力几乎不受影响.因此,PAA在实际环境应用中,具有较大的潜力和应用价值.     

基于杯[4]芳烃的选择性识别有机酸的荧光传感器

以杯[4]芳烃为平台、氨基吡啶基团为识别位点、萘环为荧光基团,合成了一类新型荧光化学传感器.采用红外光谱、质谱、核磁共振和元素分析方法对产物进行了表征,并对产物的性能及荧光分子识别有机酸的机理进行了研究.结果表明,所合成的荧光分子在乙腈溶液中能选择性识别芳香族有机酸,表现出荧光淬灭现象,其与有机酸络合能力的大小依次为:对氰基苯甲酸>对氯苯甲酸>对甲氧基苯甲酸>苯甲酸.     

基于萘的手性荧光传感器的合成及其传感性能研究

近年来,手性识别的研究越来越具有重要意义.本文以2,7-二萘酚、氯乙酰氯和S/R-苯乙胺等为原料合成了新型的手性荧光传感器R-2和S-2,并经红外、核磁、质谱表征了它们的结构.通过荧光光谱滴定实验研究了在CH3CN与HEPES(pH=7.27)缓冲溶剂的混合溶液(V∶V=2∶1)中它们与常见手性羧酸阴离子(丙氨酸、苹果酸、酒石酸及其他常见羧酸等)的相互作用及传感性能.结果表明传感器对手性二苯甲酰酒石酸阴离子表现出良好的识别性能,随着二苯甲酰酒石酸的加入,其荧光光谱强度明显降低,Job's plot实验显示形成了1∶1的络合物.传感器R-2和S-2对二苯甲酰酒石酸阴离子的响应程度不同说明它们对二苯甲酰酒石酸有好的对映选择性识别.     

基于1,8-萘酰亚胺的铜离子荧光探针

以1,8-萘酰亚胺为原料设计合成了一种新的铜离子荧光探针M,并对其结构进行了表征.荧光光谱实验表明:在乙腈溶液中,M对Cu2+表现出识别性能,加入Cu2+,其荧光发生明显猝灭,而对Na+、K+、Ag+、Pb2+、Zn2+、Cd2+、Hg2+等离子无明显响应.因此,该荧光探针对Cu2+有较高的选择性和灵敏度.     

基于萘二酰胺衍生物的氟离子荧光传感器

设计合成了一个以萘酰胺衍生物为荧光团,硫脲基团为键合基团的荧光化学传感器1.化学传感器1对氟离子表现出了较好的荧光响应性.随着氟离子浓度的增加,荧光强度先表现为增强,这是由于氟离子加入后可以和化学传感器1中硫脲基团上的氢原子形成氢键,从而增强了萘酰胺4-位取代基的给电子能力.随着氟离子浓度的继续增加,化学传感器1表现为荧光强度的降低.在对磷酸二氢根离子的实验中,化学传感器1则没有表现出较明显的荧光变化.     

偶氮二茂铁衍生物对阴离子可视化识别及电化学性质

设计合成了一类新型的具有缺电子结构的偶氮类化学传感器(L1～L3).该类化合物对F~-具有明显的颜色变化响应,可用于F~-的可视化检测.化合物L3含有富电子基团二茂铁,通过颜色和电化学检测发现,L3只对F~-表现出高度选择性识别.这种由于化学结构的改变而引起的阴离子传感性质变化为开发新型的功能传感器提供了一种新的研究思路.     

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.     

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.     

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.     

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.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.