纳米氩颗粒导热性能的非平衡分子动力学模拟

为了研究尺寸变化对纳米颗粒导热的影响,采用非平衡分子动力学模拟方法研究了固定原子壁面边界条件下,平均温度在45 K、边长为3.186～12.744 nm的立方形和半径为4.248～10.62 nm的球形2种纳米Ar颗粒的热导率,并与其他研究者的结果及薄膜的模拟值进行了对比.模拟结果表明,在固壁边界条件下, 2种颗粒的热导率均随着尺寸的增加而趋向块体值,但均小于相同厚度、相同边界条件的Ar薄膜的热导率;球形颗粒的热导率小于边长与其半径相等的立方形颗粒的热导率.     

工业五氧化二钒制备V2O5半导体薄膜分析

用攀钢工业V2O5为原料采用无机溶胶－凝胶法制备V2O5溶胶和凝胶，并用此胶体不同衬底上制备出透明的半导体V2O5薄膜。研究了胶体粘度对涂膜的影响，以及薄膜电阻率与温度、烘干处理和厚度的关系。用扫描电子显微镜（SEM）研究了薄膜的微观形貌，用XRD研究了薄膜的成份及其变化。结果表明：胶体粘度对涂膜有较大影响；温度、湿份、薄膜厚度对薄膜电阻率均有较大影响；V2O5薄膜由针状V2O5颗粒组成，在衬度上呈均匀分布，且结构比较密集，其颗粒径向尺寸为0.5-1.0μm，长度方向为3.0-5.0μm。烘干处理后颗粒轮廓略有模糊、结构稀疏且尺寸有所长大，同时新生成了一些钒化合物。     

硅油基底Ni薄膜的生长机理及微观结构研究

基于液相材料可用作薄膜生长基底的事实,采用真空热蒸发沉积方法,在硅油基底表面制备了具有近似自由支撑边界条件的镍(Ni)薄膜系统。在原子力显微镜(AFM)的观察下发现,镍分枝状凝聚体事实上是由尺寸为几十纳米且呈现高斯分布的原子颗粒组成,在一定的沉积速率下,其原子颗粒的平均直径随着薄膜名义厚度的增加而迅速减小;同时,还观察到了Ni薄膜的反常边缘效应,并对此现象做了一定的物理分析。     

颗粒膜的研究

颗粒膜的研究ＡＳｔｕｄｙｏｎＧｒａｎｕｌａｒＦｉｌｍｓ￥／／都有为（南京大学微结构国家实验室，教授南京２１０００８）颗粒膜（ＧｒｏｎｕｌＱｒｆｉｌｍｓ）是微颗粒嵌人薄膜中所构成的复合薄膜，是一类人工功能材料，它兼具微颗粒与薄膜双重特性。原则上，任意两...     

用电镜测定银簿膜的厚度

本文详细讨论了利用电镜测定银薄膜厚度的原理和方法。主要内容有，电子对银散射截面的计算和薄膜厚度与电子束的相对电流密度关系的计标。     

离散颗粒多尺度分级模型与破碎模拟

在所建议传统离散颗粒模型基础上引入了多尺度分级模型,定义了不同尺度的基本颗粒和颗粒簇模拟颗粒破碎现象．在统计断裂力学Weibull分布公式基础上利用名义应力给出了多尺度分级模型意义下颗粒破碎概率;结合颗粒簇的解簇模型建议了一个可模拟颗粒破碎的多尺度分级离散颗粒模型．数值例题初步显示了所建议模型模拟颗粒破碎现象的有效性．并利用所提出的名义有效应变和名义体积应变显示了颗粒破碎过程对颗粒材料结构物变形的影响．     

磁性金属—绝缘体颗粒薄膜

介绍了磁性金属－绝缘体颗粒薄膜的结构特征与电阻率的关系。评述了作为磁传感器件，高密度记录介质和读出磁头潜在应用相关的磁阻效应，巨霍尔效应，高矫元力特性。     

有机-金属结构的复合薄膜及其激光写入效应

通过真空蒸发的方法,在有机层表面蒸镀厚度为纳米尺度的银(Ag)金属层,制备了有机-金属结构复合薄膜.低功率激光照射之后,该复合薄膜的表面产生明显的激光写入点.用扫描电子显微镜(SEM)观察了激光写入点的形貌,并用紫外-可见(UV-vis)吸收光谱以及X-射线光电子能谱(XPS)对复合薄膜进行了表征,研究证明银超薄层中存在Ag纳米颗粒,这些纳米颗粒与有机层之间存在明显的相互作用.     

颗粒尺寸和数密度可独立调控的Pb纳米颗粒薄膜的气相制备

采用基于磁控等离子体团簇束流源的低能团簇束流沉积制备不同形态的Pb纳米颗粒薄膜。通过透射电子显微镜TEM对颗粒的尺寸、数密度进行表征分析,建立磁控等离子体团簇源及低能团簇束流沉积过程的可调参数——溅射气流、缓冲气流、溅射电压电流、沉积时间等与颗粒尺寸、数密度的对应关系,并通过对参数的调整优化获得Pb纳米颗粒薄膜中颗粒尺寸和数密度的独立调控。     

不同衬底温度下制备的Co-Al-O介质颗粒薄膜的巨磁电阻效应

利用射频反应溅射的方法在不同衬底温度（Ｔｓ）下制备了Ｃｏ－Ａｌ－Ｏ介质颗粒薄膜。薄膜的本征电阻及磁电阻值密切依赖于薄膜制备过程中的衬底温度。通过原子力显微镜对样品表面的观察发现：以Ｃｏ为基的纳米磁性颗粒的尺寸随Ｔｓ的增加而变大,并且颗粒之间由完全初介质分离逐渐变化到互相连接．对应这种结构上的变化,薄膜的电导机制由隧道效应向金属性电导转变,相应地薄膜的磁电阻值也发生了变化。     

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.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-