镍微粉的颗粒度测定条件研究

镍微粉的粒度对其最终产品的性能有显著的影响．本文采用激光粒度法测定了镍微粉的颗粒度,研究了分散剂种类、分散剂用量、超声时间、搅拌速度和循环分数对镍微粉粒度测定的影响,得出最佳测定条件为：添加的分散剂为正丁醇;分散剂用量为5．0％;超声时间为1．5min;搅拌速度为30％：泵循环分数为25％．     

灵芝野微粉的激光粒度测定法研究

灵芝的颗粒度对其药理作用有显著的影响．本文采用激光粒度法测定了灵芝野微粉的粒度,研究了分散剂种类、分散剂用量、超声时间和测定温度对灵芝野微粉粒度测定的影响,得出最佳测定条件为：添加的分散剂为吐温-80;分散剂用量为1．0％：超声时间为〉6min;测定室温为5℃-35℃．     

灵芝野微粉的激光粒度测定法研究

灵芝的颗粒度对其药理作用有显著的影响．本文采用激光粒度法测定了灵芝野微粉的粒度．研究了分散别种类、分散剂用量、超声时间和测定温度对灵芝野微粉粒度测定的影响,得出最佳测定条件为：添加的分散剂为吐温-80：分散剂用量为1．0％：超声时间为≥6min;测定室温为5°C-35°C．     

硅微粉粒度测定中的分散性探讨

采用沉降法测定了硅微粉的粒度. 研究了分散剂种类、分散剂加入量、硅微粉在水中的质量分数和温度对硅微粉粒度测定的影响,得出了最佳测定条件为:添加的分散剂为脂肪醇聚氧乙烯醚;分散剂加入量为0.06%;硅微粉在水中的质量分数为0.6%～1.0%;测定室温为10℃～30℃.     

不同分散剂对水热法制备氧化锆颗粒分散性的影响

研究利用氯氧化锆和氨水作为原料水热法制备氧化锆微粉的方法。对分散剂种类及分散剂量对氧化锆微粉分散性影响进行了讨论,应用扫描电子显微镜和粒度分布仪对获得的氧化锆粉体进行分析。结果显示：加入聚乙二醇6000时,二氧化锆在水中分散性最好;采用1.150%聚乙二醇作为分散剂时,可获得在水中分散性较好的氧化锆粉末;相同质量分数的分散剂,分散效果较好的排序是：有机高聚物〉无机电解质〉阴离子表面活性剂〉有机物异丙醇。     

Sol-gel水热偶合法制备纳米AlOOH及其表征

以AL2（SO4）3为原料，在pH值为3．5，溶胶浓度为0．3-0．5mol/L，分散剂0．3％，温度为80℃的条件下，胶溶4h，后经5h100-150℃的水热处理，制得平均粒度小于70nm的AlOOH；用TEM、X射线衍射、TG-DTA对样品进行了表征，并研究了不同介质、不同pH、不同分散剂用量对分散性能的影响。     

利用无机分散剂制备纳米硫氰酸亚铜粉体

以无机盐硫酸铜为原料，亚硫酸钠做还原剂，硫氰酸钠为沉淀剂，首次直接利用无机分散剂六偏磷酸钠制备出了纳米CuSCN颗粒．讨论了影响产物粒径的因素，包括分散剂的用量、反应物的浓度和pH值，其最佳工作条件为：分散剂质量分数为0．03％-0．06％，反应物浓度为0．3mol／L，pH=8-10．用透射电镜、扫描电镜、红外光谱和X射线衍射对产物进行了表征．结果表明，产物符合要求，粒径大约80nm。     

片形超细碳酸钙的制备研究

采用间歇鼓泡碳化法合成片形超细碳酸钙，考察了碳化反应温度、灰乳比重、搅拌转速、化学添加荆等因素对碳酸钙粒子形貌、粒径及径厚比的影响．得到了最佳工艺条件：碳化反应温度20～25℃，添加荆质量分数为1．5%～2．0％，灰乳比重d≤1.05，搅拌转速约400r／min．最终制得了粒度为2．0-3．0μm，最大径厚比为10～16，晶型为方解石的片形超细碳酸钙．     

有机分散剂对ZrO2粉体粒度的影响

借助粒度分析仪、ＳＥＭ形貌观察,研究了以ＮＨ４ＨＣＯ３为沉淀剂的溶胶共沉淀法制备ＺｒＯ２粉末过程中有机分散剂对粉体团聚状态及颗粒度的影响．结果表明,沉淀过程、烘干过程中ＰＶＡ的加入可以大大改善粉体的团聚状态,适当匹配ＰＶＡ用量可以获得基本无团聚的粉末．ＰＶＡ的最佳匹配为：沉淀过程质量分数７％,烘干过程质量分数３％．     

天青石中添加CaCl2生产SrCO3的试验研究

报导了添加剂CaCl3在天青石还原焙烧中的反应行为；并从试验中寻找出了使用该添加剂的最佳反应条件。实验结果表明：CaCl2用量为0．5％－1％，反应温度为1150－1200℃，反应时间为30min，矿：煤为1：0．6，矿、煤粒度为20－40目时，可使SrCO3生产的转化率最高。     

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