光子相关光谱法测量超细颗粒的理论研究

光子相关光谱学(PCS)是一项近年来取得较大进展的新应用技术,该技术利用悬浮于介质中的散射体的布朗运动所引起的散射光强涨落现象,能测量粒径范围为3nm～3μm的超细颗粒。本文详述了PCS测粒法的基本理论,综述了各种预测颗粒粒径分布的数据处理方法,并提出了对PCS进一步研究的若干问题。     

膜分散沉淀法制备硫酸钡超细颗粒

将膜分散技术应用于超细颗粒的制备过程,以氯化钡和硫酸钠为原料制备硫酸钡为例,对于膜分散沉淀法制备超细硫酸钡颗粒的影响因素进行了研究,并将膜分散沉淀法与直接搅拌沉淀法相比较。研究结果表明:在同样的反应条件下,直接搅拌沉淀法得到的颗粒成片状,粒度在0.3～1.0 μm;而膜分散沉淀法得到的颗粒球形度好,平均粒径在10～100nm。膜分散沉淀法制备硫酸钡超细颗粒粒度小,粒径分布窄,单分散性好;硫酸钡颗粒粒度随硫酸钠浓度的升高而迅速降低。在膜分散沉淀过程中无需进行搅拌。该方法与直接沉淀法相比具有能耗低、可连续操作、以及粒径可控的优点,是一种高效新型的超细颗粒制备方法。     

基于分维计算的颗粒粒度分析方法

提出了一种基于分形检测超细颗粒粒度的新方法及实现算法,超细颗粒在一定条件下产生布朗运动,通过光电系统记录的图象可看成是群体颗粒无规则漫游的结果,从而可用分数布朗运动模型去描述,对所获取的超强微粒布朗运动图象进行处理,然后按以上分形模型进行逐点的分维计算,再用统计的方法转换为粒度信息,从而实现粒度测量,文中给出了具体的算法及算例。     

利用高温显微镜研究硅砂粒度对玻璃熔化的影响

本文讨论了利用高温热台显微镜对硅砂粒度上限、下限以及细颗粒含量对玻璃熔制过程的影响,确定出符合玻璃生产所需要的最佳硅砂粒度。     

凝胶网格法制备CdS超细颗粒

该文首次利用凝胶网格法制备了ＣｄＳ超细颗粒,测定了样品的等电点及ＴＥＭ粒度分布,ＸＲＤ等性能表征并对结果进行了讨论证明上法简单,易控,具有很强的实用性。     

微细颗粒粒度分析方法与测试技术

超细颗粒由于其具有一系列特殊的性质,在国民经济和国防现代化以及现代高科技领域具有重要价值,有着广阔的应用前景。超细颗粒的测量方法和测试技术则是颗粒研究领域的热点。笔者分析并综述了现代颗粒测试的方法和技术,讨论了这些方法应用于亚微米级超细颗粒的测量时存在的问题和局限。     

超细颗粒悬浊液中声衰减和声速的数值模拟-- 4种模型的比较

分别运用了4种数学模型 ECAH模型、Harker & Temple模型、BLBL模型以及McClements模型研究了声波在超细颗粒悬浊液中传播的衰减和相速度,对各种模型的数值模拟计算结果进行了比较,讨论了各种衰减机制对模拟结果的影响. 结果对将超声方法用于悬浊液和乳剂中的颗粒粒度、浓度测量的实验研究和工程应用均有一定参考价值.     

Photo—Fenton反应产生的羟自由基的研究

报道了用紫外分光光度法间接测定Ｐｈｏｔｏ－Ｆｅｎｔｏｎ反应即利用光激发ＴｉＯ２超细颗粒产生的Ｈ２Ｏ２进行Ｆｅｎｔｏｎ反应。产生的羟自由基。通过对测定结果的分析,得到ＴｉＯ２超细颗粒与光激发ＴｉＯ２超细颗粒产生的羟自由基之间的定性和定量关系,从而为进一步研究纳米材料的光催化氧化机理提供一种简单易行的方法。     

紧密堆积优化炸药粒度级配技术研究

以Dinger-Funk模型和可压缩堆积模型为基础,对炸药进行颗粒级配和堆积密实度的计算;并以黑索今炸药进行实验,验证了计算结果的准确性,探讨了炸药体系中细颗粒添加量对堆积密实度的影响。结果表明,经过粒度级配可以实现炸药粒度分布的优化,用可压缩堆积模型可以很好地预测炸药的堆积密实。在满足紧密堆积——Dinger-Funk粒度分布模型条件下,级配后的堆积密实度度提高了16%;只增细颗粒时,堆积密实度与原材料的粒度分布相关联。     

溶胶-凝胶法合成人造金红石超细颗粒

探讨了文题的方法,研究了反应物与催化剂浓度对凝胶化速度、颗粒大小及分布的影响。结果表明,烷氧基钛在醋酸催化作用下水解和缩聚可制备均匀透明的块状凝胶,经干燥、焙烧得到金红石型的TiO_2超细颗粒。颗粒平均粒度随水含量增加而下降;随水解底物浓度的增加而下降,然后略有上升;随醋酸浓度增加而降低。醋酸根离子浓度不仅作为催化剂,而且作力能形成Ti(OC_4H_9)_x(Ac)_y络合物的配位体而起作用,改善了颗粒粒度的均匀性。凝胶透明度与颗粒的粒度及其分布有关,而与凝胶化时间无关。本法制备的TiO_2颗粒粒度细(20～200nm)、单分散性好且纯度高。     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with