花状Ag/ZnO复合光催化剂制备及其光催化性能

以氯化锌(ZnCl2)、氢氧化钠(NaOH)和硝酸银(AgNO3)为原料,采用沉淀法和紫外光照射法制备花状Ag/ZnO复合光催化剂;利用X射线衍射(XRD)、扫描电镜(SEM)对样品物相、结构和形貌进行测试与表征;通过紫外光照射降解罗丹明B(RhB)研究Ag/ZnO复合物的光催化性能.结果表明:Ag添加可以有效提高ZnO的光催化性能;Ag添加量及复合物的形貌对Ag/ZnO复合光催化剂降解RhB具有协同调控作用.     

氧化石墨-银复合物的微波辅助合成与表征

采用休谟法以鳞片状石墨粉为原料制备了氧化石墨,并用微波法使其与硝酸银复合,制得氧化石墨与银的复合物.采用X-射线衍射(XRD)、扫描电镜(SEM)、能量弥散X射线谱(EDS)、傅里叶变换红外光谱(FT-IR)等多种现代测试方法对石墨、氧化石墨、氧化石墨与银复合物的结构和组成进行了表征.结果表明,以微波辅助溶液混合法成功制得氧化石墨-银复合物.     

石墨烯/ZnSe纳米复合物的制备及电化学发光性质

将还原的氧化石墨烯加入合成的ZnSe纳米粒子溶液中,在超声作用下形成石墨烯/ZnSe纳米复合物.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)等分析测试手段对所得产物的形貌、晶型进行了表征,测试了所得产物的紫外吸收光谱和电化学发光行为,研究了影响复合物电化学发光性质的因素,探讨了复合物分析应用的可行性.     

新方法制备三氧化钼/聚苯胺插层复合物

提出一种制备三氧化钼/聚苯胺层状复合物的新方法,打破了传统制备方法对(Li/Na)_xMoO₃前驱体、离子引发剂以及水溶液环境的依赖.该方法使用烷基胺为插层剂在三氧化钼层间插入苯胺单体,然后在空气中热处理引发层间苯胺聚合形成三氧化钼/聚苯胺层状复合物.X射线衍射、扫描电子显微镜、差热分析及VSM磁性能测试结果表明,该复合物具有清晰层状形貌,层间聚苯胺以平行于层板形式存在,聚苯胺与三氧化钼在复合后磁性能发生明显变化.     

抗坏血酸稳定纳米铜/壳聚糖复合物的原位制备、表征及抗菌性能（英文）

以抗坏血酸为稳定剂,通过原位还原络合于壳聚糖表面的铜离子,制备了平均粒径(2.57±0.5)nm的高稳定的纳米铜/壳聚糖复合物.利用X射线光电子谱(XPS)和傅里叶变换红外光谱(FT-IR)表征了复合物的合成过程及其稳定性,同时采用最低抑菌浓度法(MIC)定量表征了复合物的抗菌性能.结果表明稳定结合于壳聚糖表面的纳米铜具备高效的广谱抗菌性能,特别针对革兰氏阳性菌如金色葡萄球菌以及真菌如白色念珠菌.纳米铜/壳聚糖复合物对金色葡萄球菌的MIC为6.4μg m L-1,该数值优于已报道的其他纳米铜材料.常温常压存放90天后,纳米铜/壳聚糖复合物仍具备稳定的结构和良好的抗菌性能.     

六棱柱状Au-ZnO的一步合成及其光催化性能

采用一步法制备结构均一的六棱柱状Au-ZnO复合纳米材料,并通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对其结构和形貌进行表征.结果表明,改变HAuCl4的用量能够很好地调控所合成的纳米复合物的形貌.在此基础上,研究了Au-ZnO纳米颗粒的光催化性能,当Au含量为2.65%时,所合成纳米复合物对罗丹明B染料的光降解能力最佳,降解率达到99.6%.     

纳米β-硅酸钙/硒的制备及其抗菌性能

为进一步提高β-硅酸钙(β-CaSiO_3)的抗菌活性,在通过油水界面法合成纳米β-CaSiO_3的基础上,结合氧化还原法引入红色纳米硒(Se),制备出纳米β-硅酸钙/硒(β-CaSiO_3/Se)复合物。采用X射线电子能谱(EDS)和X射线衍射(XRD)对β-CaSiO_3/Se的成分和物相进行表征,进一步采用透射电子显微镜(TEM)观察样品微观形貌。选用大肠杆菌(E.coli)和金黄色葡萄球菌(S.aureus)测试纳米β-CaSiO_3和β-CaSiO_3/Se的抗菌性能。结果表明,本方法成功制得纳米β-CaSiO_3/Se复合物,其中纳米Se晶型为六方晶型。体外抗菌测试表明,纳米β-CaSiO_3/Se对E.coli和S.aureus均具有优良的抗菌性能。纳米β-CaSiO_3/Se与E.coli和S.aureus接触培养24h的抑菌率分别达到(92±4)%和(95±4)%。纳米β-CaSiO_3/Se有望作为新型多功效生物材料在生物医学领域获得应用。     

Fe/S耦合催化剂的合成及其芬顿催化性能

采用低温真空冷冻干燥方法,以FeSO4和Na2 S为原料合成了含NaFe2 OH(SO3)2·H2 O、FeS和FeS2等主要成分的复合物芬顿催化剂,采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对材料进行了表征,并以苯酚为目标污染物,研究该催化剂对苯酚的催化降...     

花状Ag/ZnO复合物的制备及光催化性能

采用水热合成法制备ZnO微米花状粉体,利用聚乙烯吡咯烷酮(PVP)作为还原剂和分散剂,在ZnO微米花状粉体表面还原不同浓度的银氨溶液,获得花状的Ag/ZnO复合物。通过X射线衍射(XRD)、扫描电子显微镜(SEM)以及透射电镜(TEM)对它们的物性结构和晶粒形貌进行了表征,显示Ag纳米晶分散地附着在ZnO的表面。对亚甲基蓝溶液进行紫外光催化降解实验,结果表明该复合物具有很高的光催化活性。     

钛酸钡/还原氧化石墨烯纳米复合物的制备及其微波吸收特性

采用溶剂热法制备出BaTiO_3纳米颗粒,将不同质量的BaTiO_3纳米颗粒与氧化石墨烯(GO)进行复合,并在氩气保护下经过煅烧得到BaTiO_3/还原氧化石墨烯(BaTiO_3/RGO)纳米复合物.利用X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等手段系统地表征了样品的物相结构以及表面形貌,并用矢量网络分析仪(VNA)测试样品的微波吸收特性.当制备的BaTiO_3/RGO纳米复合物中BaTiO_3的质量分数为80.9%时,纳米复合物展现了良好的微波吸收性能;当其厚度为2.0 mm时,在频率为10.48 GHz处的反射损耗达到-26.06 dB,且在9.32~11.54 GHz频段内反射损耗小于-10 dB.实验结果表明,BaTiO_3/RGO纳米复合物具有优异的电磁波吸收性能.     

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