云母钛珠光颜料表面形貌的研究与制备条件的控制

采用液态沉积方法合成了云母钛珠光颜料.利用扫描电子显微镜(SEM)观察云母钛珠光颜料的表面TiO2膜形貌,发现当反应温度为78℃、pH=2.0并且在煅烧升温速率为7.8℃/min时得到的珠光颜料的包覆膜平整、连续、致密,粒径在30-50nm之间,这种珠光颜料具有很好的光学性能.     

MOCVD法制备云母珠光颜料光学性能及微结构研究

在流化床反应器中以碳基铁为物源，用金属有机化学气相沉积(MOCVD)法制备了云母珠光颜料．由颜料的SEM和EPMA图分析表明：云母微粒为片状结构，平均粒径为50μm；沉积在云母表面上的是均匀分布的30-nm的透明氧化铁微粒，这种结构对光能产生多重散射、折射、反射，从而呈现出绚丽的珠光光泽．     

尖晶石型CoAl2O4包覆云母钛珠光颜料的制备及其表征

以云母为基质,TiCl4为原料,采用强迫水解法制备了云母钛前驱体;再以Co(NO3)2.6H2O和Al(NO3)3.9H2O为原料,利用化学共沉淀法制备了尖晶石型CoAl2O4,并将其包覆在云母钛前驱体上,制备出蓝色云母钛珠光颜料.采用红外光谱和X射线衍射对产品进行了表征,并对产品进行了性能测定.蓝色云母钛珠光颜料表面包覆了金红石型TiO2和尖晶石型CoAl2O4,具有较好的珠光光泽并且性质稳定.     

Preparation and Characterization of Spinel CoA12O4 Coated Titania-mica Pearlescent Pigment

以云母为基质,TiCl4为原料,采用强迫水解法制备了云母钛前驱体;再以Co(NO3)2·6H2O和Al(NO3)3· 9H2O为原料,利用化学共沉淀法制备了尖晶石型CoAl2O4,并将其包覆在云母钛前驱体上,制备出蓝色云母钛珠光颜料.采用红外光谱和X射线衍射对产品进行了表征,并对产品进行了性能测定.蓝色云母钛珠光颜料表面包覆了金红石型TiO2和尖晶石型CoAl2O4,具有较好的珠光光泽并且性质稳定.     

新型高档装饰颜料——云母钛珠光颜料的制作

云母钛珠光颜料是由美国杜邦公司于1963年首次研制成功的.它是在片状结构的白云母粉表面上,均匀地涂履一层二氧化钛金属氧化物而制得的一类新型珠光颜料,具有珍珠光泽和金属光泽双重效应,色泽柔和明亮,极富魅力.因其具有化学稳定性高、抗紫外线、耐高温、耐腐蚀、色彩多样、无毒等优点,在国外得到大力的发展,各国研究人员对此进行了大量研究,被广泛应用于涂料、塑料、化妆品、印刷、橡胶、皮革制品及装饰品中,特别是汽车面漆等行业.产品也由早期的单一银白色型珠光颜料发展到多色相的虹彩型和着色型珠光颜料.     

云母钛珠光颜料的制备及应用

综述了云母钛珠光颜料的各种制备技术 ,包括四氯化钛加碱法、热水解法、缓冲法和其他方法 ;并且分折了各种方法的优缺点 ,重点介绍了四氯化钛加碱法及热水解法的制备技术 ,综述了此种颜料在汽车闪光面漆、粉末涂料及建筑涂料中的应用及前景     

夹心层包膜彩色珠光颜料的研制

本介绍用有机酸钛和其它金属盐水解，分层在云母基质上形成金属氧化物包膜，制备彩色珠光颜料。对制备工艺，水解条件，焙烧温度，原料配比等因素进行讨论。     

导电珠光颜料浅析

导电珠光颜料是在片状云母或云母钛的表面包覆一层或几层半导体金属氧化物,如掺锑二氧化锡SnO2-Sb2O3(antimony-doped tin oxide,简称ATO),而制得的浅色导电颜料。导电珠光颜料具有稳定性高,耐腐蚀性好,产品颜色浅,导电性能好等优点,展现出了不同于传统珠光颜料的特殊的抗静电性和屏蔽电磁辐射与干扰的性能,是一种新型无机纳米功能材料,有较广阔的应用前景。本文探讨了导电珠光颜料的导电机理和ATO与基质的复合机理,介绍了导电珠光颜料的几种制备方法,如共沉淀法、均相沉淀法、微乳液法、金属醇盐水解法等。     

云母钛珠光颜料的液相合成技术 Ⅱ云母钛前驱体的热处理过程研究

以ＴＧ－ＥＧＡ等分析检测手段探明了云母铁颜料包膜层的组成，并对其热处理工艺作了系统的研究，得到了较佳的热处理工艺。同时以ＤＴＡ、ＳＥＭ、ＸＲＤ技术研究了膜层ＴｉＯ＿２粒子在煅烧过程中的形态及物相结构变化过程，结果表明，膜层的水合ＴｉＯ＿２粒子在热处理过程中随着温度的升高逐步晶化，并由锐钛相向金红石相转化。实验制得了金红石相含量较高的云母钛珠光颜料，具有闪亮的光泽和鲜明的色调。     

高档装饰材料—珠光粉末涂料

杭州一家企业开发的珠光粉末涂料以其独特优异的性能已跻身于涂料市场,填补了国内粉末涂料品种的空白。现该产品已有八个省、直辖市,四十多家用户应用,一年多时间里已试销了近30吨,创税利23.85万元,产品质量已赢得了用户的认可和赞许。珠光粉末涂料由于在部分常用的热固型粉末涂料的配方与生产工艺中,引入了云母钛珠光颜料,从而使其获得辉煌闪烁的色泽,使原有的粉末涂料更具装饰性,可用于室内钢制家俱、户外钢门窗、自行车、汽车轮罩等民用、工业产品的涂装。由于所引入的珠光颜料系细小片状无机物,因此具有无毒、不导电、耐热、耐光、耐化学腐蚀和不产生挥发性气体等优良性能,在160～240℃下烘烤,涂膜也不变色。据有关部门按国家标准对用于钢门窗涂装的聚酯型珠光粉末涂料涂膜的测试,失光、变色、粉化、裂纹四项技术指标均达到最佳的O级;对用于钢制家俱的环氧/聚酯型     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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