β—TCP／HA双相多孔磷灰石陶瓷成骨机制的研究

通过体外实验，确定了骨形成蛋白因子ＢＭＰ在多孔磷灰石陶瓷上的吸附位点，以及两者之间的吸附性能。在β－磷酸三钙／羟基磷灰石（β－ＴＣＰ／ＨＡ）双相多孔磷灰石陶瓷诱导成骨中，ＨＡ为宿主骨及β－ＴＣＰ降解提供钙、磷源有成骨机制。这些实验结果有助于增进对羟基磷灰石骨修复材料成骨作用的了解，并能较好地解释β－ＴＣＰ／ＨＡ双相磷灰石陶瓷在体内非骨环境中的诱导成骨作用。     

β－TCP／HA双相多孔磷灰石陶瓷成骨机制的研究

通过体外实验，确定了骨形成蛋白因子ＢＭＰ在多孔磷灰石陶瓷上的吸附位点，以及两者之间的吸附性能．在β－磷酸三钙／羟基磷灰石（β－ＴＣＰ／ＨＡ）双相多孔磷灰石陶瓷诱导成骨中，ＨＡ为宿主骨及β－ＴＣＰ降解提供钙、磷源的成骨机制．这些实验结果有助于增进对羟基磷灰石骨修复材料成骨作用的了解，并能较好地解释β－ＴＣＰ／ＨＡ双相磷灰石陶瓷在体内非骨环境中的诱导成骨作用．     

β—TCP／HA双相磷灰石粉末的制备及其性质的研究

通过严格控制反应条件，以共沉淀方式合成出不含α－磷酸三钙［α－Ｃａ３（ＰＯ４）２］（α－ＴＣＰ）并组成一定的β－磷酸三钙／羟基磷灰石［β－Ｃａ３（ＰＯ４）２／Ｃａ１０（ＯＨ）２（ＰＯ４）６］（β－ＴＣＰ／ＨＡ）双相磷灰石粉末，分析了β－ＴＣＰ／ＨＡ双相磷灰石粉末的理化性质。     

β－TCP／HA双相磷灰石粉末的制备及其性质的研究

通过严格控制反应条件，以共沉淀方式合成出不含α－磷酸三钙［α－Ｃａ３（ＰＯ４）２］（α－ＴＣＰ）并组成一定的β－磷酸三钙／羟基磷灰石［β－Ｃａ３（ＰＯ４）２／Ｃａ１０（ＯＨ）２（ＰＯ４）６］（β－ＴＣＰ／ＨＡ）双相磷灰石粉末，分析了β－ＴＣＰ／ＨＡ双相磷灰石粉末的理化性质．     

废弃贝壳制备纳米带状羟基磷灰石的研究

本研究探索了利用废弃贝壳制备生物活性材料羟基磷灰石的工艺路径。采用水浴加热的方法,以贝壳粉为原料、磷酸氢二氨为磷源,尿素为添加剂,成功制备出高纯相、尺寸均匀可控的纳米带状羟基磷灰石。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(FTIR)等方法表征产物的晶相组成及形貌。XRD分析结果显示:贝壳中的碳酸钙已经完全转化为羟基磷灰石;SEM分析结果表明:采用水浴法合成得到的羟基磷灰石为纳米级别的带状结构;FTIR表征检测到羟基磷灰石中的羟基,进一步验证产物为羟基磷灰石。本研究解决了废弃贝壳环境污染的问题,同时降低了羟基磷灰石的制备成本。     

磷酸聚合辅助合成羟基磷灰石纳米结构

采用简单的低温液相方法合成了花型形貌的羟基磷灰石。深入探讨了不同反应参数对羟基磷灰石的形貌与尺寸的影响，据此推测，在这个合成方法中，由于磷酸的聚合作用辅助了羟基磷灰石纳米片的进一步自组装，从而形成花型结构。     

磷酸钙基生物活性陶瓷粉末的合成

磷酸钙基生物活性陶瓷粉末的合成杨晓鸿，王志宏，王齐祖（兰州大学材料科学系，兰州７３００００）磷酸钙基生物活性陶瓷主要是指Ｃａ／Ｐ＝１．６７的羟基磷灰石Ｃａ１０（ＯＨ）２（ＰＯ４）６（简写为ＨＡＰ）和Ｃａ／Ｐ＝１．５０的β－磷酸三钙β－Ｃａ３（ＰＯ４）...     

生物活性颌面骨的研制与临床应用

本文探讨了羟基磷灰石生物活笥颌面骨的制备工艺对其物理性能和生物性能的影响。采用注浆法，热等静压－后烧结等工艺制备出抗折强度高于人体致密骨指标的羟基磷灰石颌面骨。     

医用可降解镁合金表面磷酸盐涂层研究进展

综述了医用镁合金表面磷酸盐涂层的制备工艺和特点,主要介绍了医用镁合金表面几种Ca-P(包括二水磷酸氢钙、磷酸三钙和羟基磷灰石)转化涂层及其(F、Sr和Ce)元素掺杂涂层的腐蚀性能和生物学特性,并简要提出了医用可降解镁合金表面磷酸盐转化膜工艺涉及的环境、工艺稳定性问题和研发策略。     

羟基磷灰石陶瓷中氧缺陷及其与OH离子的氢键作用

用ＦＴ－ＩＲ光谱等方法对羟基磷灰石陶瓷中一种氧缺陷进行研究的结果表明，这种缺陷与羟基磷灰石ＯＨ离子有氢键作用生成，使陶瓷呈暗红色。该试样可以在Ｎ２甚至ＣＯ２中退火漂白，又能在Ｏ２中重新赋色。经光谱与结构分析推断，这种缺陷是位于羟基磷灰石ＯＨ格位上的双氧基团构成。     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the