CaO-Al2O3-SiO2系烧结微晶玻璃的结晶过程

为控制微晶玻璃中晶体的数量、晶粒尺寸和形貌,采用Ｘ射线方法测定了ＣａＯ－Ａｌ２Ｏ３ －ＳｉＯ２ 系玻璃颗粒在烧结过程中的相对结晶率,并结合扫描电镜研究了不同温度区域内的结晶过程。实验结果表明,在低温（９００ ℃以下）烧结时,晶体沿原玻璃颗粒的界面生成,向玻璃颗粒内部生长,而在原玻璃颗粒的内部无析晶发生,此时的结晶率较低; 在中温区（９００～１ ０５０ ℃）烧结,晶体在玻璃颗粒界面和颗粒内部同时析出并长大,可获得较高的结晶率; 高温区（１ ０５０～１ １００ ℃）烧结时由于玻璃颗粒界面的快速粘合以及相变驱动力的减小,结晶率又趋于下降。     

冷却速率对连铸保护渣结晶性能的影响

采用WCT－2型差热分析天平和LEITZ光学显微镜（配有1350℃高温热台），研究了冷却速率对连铸保护渣结晶性能的影响。研究结果表明：随冷却速率提高，保护渣的结晶温度显著降低，结晶率降低，晶体尺寸减小，晶形也有很大改变。     

熔融结晶分离提纯对间硝基氯苯的研究

研究了对位硝基氯苯和间位硝基氯苯在不同组成下的结晶情况，考察并分析了各种操作条件如降温速率、结晶终温和发汗终温等对熔融结晶过程中不同因素的影响．结果表明：对位组成为89．31％的最佳操作分离条件是降温速率0．05—0．055℃／min，结晶时间460～500min，结晶终温58—62℃，发汗终温82—83℃；间位组成为76．03％的最佳分离条件是加入晶核温度32．5～33℃，降温速率0．015～0．016℃／min，结晶终温26．5～28℃，发汗终温34～36℃．用最小二乘法建立了与实验结果拟舍良好的数学方程，获得了有益的操作参数并进行了模拟计算．     

PET／PEN扩链反应共混的研究——结晶与熔融行为

用差示扫描量热法（DSC）研究了PET／PEN扩链反应性共混物体系的热性能,对共混比例、温度和时间对热性能的影响进行了讨论,并进一步考察了序列结构变化和热性能的关系。结果表明,不同比例的PET／PEN都呈现出一个玻璃化温度,即PET、PEN在无定形态是相混溶的;冷结晶温度和熔融温度与共混比例、共混时间、温度等因素密切有关。PET／PEN50／50即使共混短时间,亦不结晶。其他比例共混物随共混时间的增加,冷结晶温度升高,熔点下降,与序列长度变化有关,当序列长度小于7时,冷结晶峰消失。当酯交换大于30％时熔融峰消失。     

磷酸盐与山梨醇类成核剂成核PP样品等温结晶行为与熔融特性

用差动扫描量热计（DSC）研究了一种有机磷酸盐类成核剂（A）、山梨醇类成核剂（D）成核PP和纯PP的等温结晶行为和熔融特性。结果表明成核样品缩短PP的半结晶时间，成核型A比D更明显；纯PP样品的半结晶时间正比于结晶温度，而成核PP的半结晶时间与结晶温度的关系在结晶温度低时，依赖性较纯PP的小，而在高结晶温度，半结晶时间对结晶温度的依赖性比较PP的大。成核剂的加入使PP结晶完善性提高，且熔融峰发生改变，熔融峰高温区出现一肩峰；而纯PP在低温区有一很宽的肩峰。根据半结晶时间，2种成核剂的成核效果为A＞D，与非等温结晶的结果一致。     

结晶紫表面增强拉曼与时间关系研究

【目的】研究银包金纳米颗粒(Ag@AuNP)对结晶紫信号的增强效果与时间的关系。【方法】用新型纳米材料银包金纳米颗粒作为拉曼增强基底,采用785nm激光激发结晶紫表面增强拉曼光谱,统计光谱特征峰强度变化趋势。【结果】结晶紫725cm-1,801cm-1,914cm-1,1177cm-1,1392cm-1,1588cm-1等特征峰强度在0~30min内随时间的延长而逐渐升高,达到一个平台后随时间(30~36min)的增加基本保持不变。【结论】最优最快的结晶紫表面增强光谱的测定时间约为30min,该结论丰富了表面增强拉曼的研究成果。     

聚丙烯等温结晶实验参数的确定方法

用差示扫描量热分析法，对纯聚丙烯PP在不同结晶温度Tc下进行等温结晶。应用Avrami方程进行数据处理的。结果表明结晶起始时间to的不同取法，1g[—1n(1—Xc(t))]对lgt关系图的斜率变化很大，其线性关系的结晶度范围也不同；等温结晶温度Tc在128-134℃之间，斜率随温度升高而略有增大；成线性关系的结晶度范围基本不变；Tc在128℃以下，斜率随温度的降低减小很大，成线性关系的结晶度范围明显变窄。     

偏氯乙烯-氯乙烯共聚物薄膜挤出成型中的动态结晶过程

对偏氯乙烯－氧乙烯共聚物（ＶＤＣ－ＶＣ）薄膜生产过程进行了分步模拟，通过Ｘ光衍射、ＤＳＣ分析，揭示了生产环节中温度、应变、对薄膜结晶的影响。实验表明，骤冷保持了管膜的无定形状态；在３６℃温水浴中停留时间的增加使晶粒尺寸增长；随拉伸速度增加，初期结晶速度加快，但在结晶后期达到的结晶度变化不大；当拉伸比大于３时，应变诱导结晶形成较快，拉伸昌比等温结晶形成的晶粒尺寸小得多；正常生产的薄膜在室温下存放晶粒     

深过冷金属熔体中单晶形成的临界条件

将形核率和晶体生长速度对过冷金属结晶晶粒数的影响用过冷度统一起来，建立了过冷金属结晶晶粒数随金属热力学过冷度变化的理论关系。结果表明：过冷金属的结晶晶粒数随金属热力学过冷度的增大而减小，过冷度增大到一临界值后，过冷金属的结晶晶粒数减小到１；所得到的在过冷金属熔体中形成单晶的理论判据与有关实验结果完全吻合。     

汞(Ⅱ)-碘化物-结晶紫体系的共振瑞利散射光谱及其分析应用研究

研究了汞（Ⅱ）-碘化物-结晶紫体系的共振瑞利散射（RRS）光谱．实验结果表明，在0．02mol/L的H2SO4溶液中，[HgI4]^2-与结晶紫在水相中由于静电引力和疏水作用力形成蓝色的离子缔合物时，产生相应的散射光谱，其最大RRS波长分别位于345nm和510nm．在0～0．4μg／mL范围内汞（Ⅱ）浓度与散射强度（△I）成正比．该法灵敏度高，选择性较好，操作简便，可直接用于水体中痕量汞（Ⅱ）的测定．     

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