基于四甲氧基硫杂杯[4]芳烃荧光猝灭的Fe3+光化学传感器研究

Fe3+对固定于聚氯乙烯(PVC)膜中四甲氧基硫杂杯[4]芳烃有荧光猝灭作用,研制成测定光化学传感器,传感器敏感膜的最佳化学组成为:50mgPVC粉、100mgDOS和2.5mg杯芳烃.在最佳pH为7.0的溶液中测定其线性响应范围为5.32×10-8-1.48×10-3mol/L,检出限为1.59×10-8mol/L,...     

荧光氧传感纳米粒子的制备

采用模板法将氧敏感的荧光探针-三(2-苯基吡啶)合铱(Ⅲ)[Ir(ppy)3)]包埋在二氧化硅纳米粒子中,并将制得的二氧化硅纳米粒子(SiNP)用于氧的荧光传感检测.实验结果表明所制得的SiNP对氧的浓度响应范围在0～30. 31μg/mL.     

电聚合硫堇修饰青霉素酶电极的研制

制备了电聚合硫堇膜修饰青霉素酶电极(青霉素酶/Thi/GCE),用于检测残留青霉素.运用循环伏安法研究了青霉素G钠在该电极上的电化学行为,并对电极的制作条件及检测条件进行了优化.结果表明在戊二醛质量分数为2.47%,牛血清蛋白质量分数为6.57%,固定化时间为2.44h,用酶量为50μL条件下制备的酶电极在pH为7.0,温度为25℃时响应性能达到最佳.该电极对青霉素G钠的线性范围为0.08～1.0μg/mL.     

4-甲氧基苯基卟啉与锰显色反应研究

研究了非水溶性4-甲氧基苯基卟啉与锰的显色反应.试验结果表明,在氨性缓冲溶液(pH=8.8)和非离子表面活性剂Tween-80存在下,4-甲氧基苯基与锰经沸水浴加热30min,形成灵敏度极高的有色配合物,其摩尔吸光系数为1.36×105,最大吸收波长为430nm,锰含量在0～3.0μg/25mL范围内,符合比耳定律.将其应用于自来水等样品分析,获得满意的效果.     

敏感性pH光学薄膜及其在pH振荡反应中的响应性

以醋酸纤维素为基质,采用包埋法固定pH指示剂刚果红,制备了一种平均厚度为10μm光化学pH敏感膜(CCM)。利用扫描电镜、红外光谱仪、紫外可见光谱仪及视频接触角分析仪对CCM组成、结构和形貌等进行了表征,对其pH响应性能以及与pH振荡反应的响应行为进行考察。结果表明,在pH值为2.7~7.2范围内,CCM薄膜具有良好响应性,能够实现吸光强度与pH振荡的同步性。醋酸纤维素与刚果红分子间丰富的相互作用是分散与固定化刚果红的主要原因。经碱水解处理可增加薄膜中的羟基,提高薄膜润湿性及溶胀性,从而能够有效提高薄膜的响应性。     

磺化聚苯醚/多烷氧基硅共聚物杂化离子膜的制备及性能研究

文章利用聚(对氯甲基苯乙烯-γ-甲基丙烯酰氧基丙基三甲氧基硅烷)(poly(VBC-co-γ-MPS))与磺化聚(2,6-二甲基-1,4-苯醚)(SPPO)进行共混和原位溶胶-凝胶(sol-gel)反应,再与二甲胺水溶液反应,制备得到酸-碱对有机-无机杂化离子膜。该膜具有较高的热稳定性、化学稳定性、离子交换容量以及质子电导率。合适摩尔分数的poly(VBC-co-γ-MPS)制备的膜的离子交换容量值为2.15mmol/g,水质量分数为80%,拉伸强度为13.4MPa,断裂伸长率为26%,质子传导率为0.086S/cm。与一般的杂化膜相比,膜的稳定性及质子传导率有显著提高。     

微接触印刷法制备新型液晶垂直取向膜

采用微接触印刷法在盖玻片表面制备了微米级沟槽状N′-β′-氨乙基-N-β-氨乙基-γ-氨丙基三甲氧基硅烷薄膜,通过在其表面组装Cu ²⁺制得了液晶垂直取向膜。当有机膦化合物甲基膦酸二甲酯(DMMP)气体通过薄膜表面时,液晶分子发生偏转;当新鲜空气通过时,液晶分子恢复垂直排列,从而实现对DMMP的定性检测。     

DNA荧光定量测定的新方法

利用DNA对帕珠沙星的荧光猝灭作用建立DNA定量测定的新方法,CT-DNA,smDNA和hsDNA响应线性范围分别为0.65~33.3μg/mL、0.78~46.3μg/mL和1.07~48.1μg/mL,检测限分别为0.07μg/mL、0.02μg/mL和0.02μg/mL。     

基于氨基酸多氨基化合物氨气敏感膜的制备与应用

研究了赖氨酸1,4-丁二醇酯(Lys-4)对聚苯胺(PANI)氨气敏感膜的影响.通过静电纺丝技术得到含有Lys-4的混纺聚丙烯腈(PAN)纳米纤维膜,之后在静电纺纤维膜表面聚合苯胺得到具有核壳结构的纳米纤维复合膜.研究表明,Lys-4的加入提高了PANI敏感膜对氨气的灵敏度及对氨气的选择性,对于浓度为100μL/L的氨气,敏感膜的响应值从1.55增加到2.38,氨气最低检测浓度也进一步降低,为更加准确地检测氨气提供了新方法.     

基于聚邻苯二胺复合膜电位型免疫传感器的制备

首先利用循环伏安法制备聚邻苯二胺(POPD)修饰碳糊电极(CPE/POPD),然后在CPE/POPD上电沉积普鲁士蓝(PB) 和纳米金(GNPs),制备CPE/POPD/PB-GNPs电极,最后将羊抗小鼠IgG通过金-氨键固定在CPE/POPD/ PB-GNPs上,从而制得一种免疫传感器(CPE/POPD/PB-GNPs/Ab).用循环伏安法和电化学交流阻抗技术对电极的修饰过程进行表征.利用所制备的免疫传感器对溶液中的小鼠IgG进行检测,结果表明,在2.0×10-5 μg/L和1.0×04 μg/L 2种浓度下,免疫传感器均得到了很稳定的电位响应信号,响应时间不超过3 min.所制备的免疫传感器具有灵敏度高、响应速度快、检测范围宽、成本低廉等突出优点.     

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.     

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