芳砜纶织物的纳米抗紫外整理

室温条件下,将经过一定浓度氢氧化钠处理的芳砜纶织物,用自制的TiO2-SiO2复合溶胶整理.整理后芳砜纶织物上原位生长有纳米TiO2,红外光谱测试表明纳米TiO2原位生长于芳砜纶纤维上.紫外老化实验证明,纳米TiO2可以有效地提高芳砜纶织物的紫外光老化性能.     

纳米CuO在水介质中分散性能的实验研究

为了解纳米CuO在水介质中分散性能,以纳米材料常用的十二烷基苯磺酸钠、十六烷基三甲基溴化铵和聚乙二醇为分散剂,采用磁力搅拌和超声振荡与添加分散剂相结合的方法制备纳米CuO悬浮液,研究了磁力搅拌和超声振荡以及分散剂型与剂量对纳米CuO悬浮液分散性能的影响。结果表明:磁力搅拌和超声振荡对于纳米CuO粒子在水介质中的分散具有一定的效果,但不能明显提高悬浮液的分散稳定性,而添加一定剂量的分散剂对悬浮液的分散稳定性起着至关重要的作用。磁力搅拌30 min和超声振荡60 min与添加质量分数为0.05%的十六烷基三甲基溴化铵,对0.2%的纳米CuO悬浮液的分散稳定性效果最好。     

PET织物纳米TiO2抗紫外线整理及性能研究

通过对纯PET长丝织物浸轧焙烘纳米TiO2整理液,使织物表面附着纳米TiO2颗粒,并对织物表面形貌用SEM观察,发现纤维表面覆盖有一层纳米级颗粒,呈局部分散与团聚的不均匀状态.用紫外线防护系统测试织物,发现整理后织物具有较好的抗紫外线效果,且当纳米TiO2含量在1.5%时,抗紫外线效果最好.对织物皂洗20次后测试其抗紫外线效果,发现织物具有较好的耐洗性.对整理前后织物服用性能测试对比发现,纳米TiO2整理织物对织物服用性能几乎无影响.     

锐钛型纳米TiO_2材料分散工艺与技术研究

锐钛矿纳米TiO_2催化活性高,被应用于光催化降解汽车尾气中。然而,纳米TiO_2颗粒在溶液中容易产生自发的凝聚行为,严重影响了其光催化降解汽车尾气性能。文章通过试验研究了分散剂种类和掺量、分散方法、分散时间对锐钛矿纳米TiO_2分散性能的影响规律,并对锐钛矿纳米TiO_2在水中的分散稳定性进行了评价。试验结果表明,合适的分散剂先机械剪切搅拌然后进行超声波分散能够显著地提高锐钛矿纳米TiO_2在水中的分散稳定性。在试验的基础上,进一步研究了锐钛矿纳米TiO_2在溶液中的团聚机理,提出了一种改善锐钛矿纳米TiO_2在水溶液中稳定性的新方法。     

有机相变蓄冷材料中纳米石墨添加剂性能实验研究

针对有机相变蓄冷材料导热系数低、传热性能差的缺点,采用向其中添加纳米石墨,通过超声分散法及添加分散剂制备稳定分散液来改善其导热性能。对分散剂的种类、纳米石墨的质量浓度、超声时间和分散剂浓度对纳米石墨分散稳定性的影响及添加纳米石墨对导热性能的影响进行了实验研究。     

纳米TiO2的分散及光催化活性

为了研究纳米TiO2的分散及其紫外光催化活性,采用不同的分散剂、用量、pH条件及不同的超声波工作参数制备纳米TiO2分散体系.采用动态光散射法分析纳米颗粒的分散状态,采用分光光度法分析不同分散体系的纳米TiO2在紫外光照射下对亚甲基蓝降解率.采用100％FBS作为分散剂可以获得最小粒径的TiO2分散体系且有最大的光催化...     

纳米TiO2在纺织品抗菌、抗紫外线整理中的研究

首先对纳米TiO2表面进行化学和物理处理,以降低其团聚作用,实现纳米尺度优良的分散性.然后详细讨论了纳米TiO2在纺织品抗菌、抗紫外线辐射整理中的作用机理,以及在纯棉织物上的应用.处理后赋予织物优良的抗菌、抗紫外效果,且服用性能不受影响.     

纳米TiO2\环氧树脂复合涂料制备工艺研究

以TiO2纳米颗粒增强环氧树脂涂料,可以充分提高涂料的力学性能和耐腐蚀性能.通过对复合涂料不同工艺的研究来了解分散剂对TiO2纳米复合涂料性能的影响,从而找到在复合涂料中对纳米粉体起到良好分散效果的行之有效的方法.     

纳米TiO_2整理羊毛织物防毡缩的工艺优化

从毛织物毡合、起毛、起球,容易变形,尺寸稳定性差等现实问题出发,通过实验研究,讨论纳米TiO2整理毛织物防毡缩的最优工艺.采用溶胶-凝胶法制备纳米TiO2材料,将其配制成稳定的防毡缩纳米整理剂;通过分析聚氨基树脂、TiO2、TiO2-聚氨基树脂整理工艺对毛织物毡缩的影响,得到最佳的羊毛防毡缩整理的整理工艺.结果表明:该工艺可以降低纤维表面的摩擦阻力,极大地改善羊毛织物的防毡缩.     

纳米TiO2在棉织物抗紫外整理中的应用

利用溶胶一凝胶技术,以钛酸四正丁酯为前驱体,制得纳米TiO2水溶胶,以该水溶胶对纯棉织物进行抗紫外整理.采用x射线衍射(XRD)分析了TiO2的晶型,且用场发射扫描电镜(FESEM)观察了TiO2粒子的形貌.并对织物整理前后的白度、撕破强力等物理性能进行了测试和比较.结果表明:利用溶胶一凝胶技术,在低温条件下,对纯棉织物进行功能整理是可行的,在织物表面生成了锐铁矿相纳米TiO2.经过整理的织物具有突出的抗紫外、抗静电性能和一定的拒水性.     

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