二氧化碳驱多场耦合粗化研究

二氧化碳驱过程是一个动态的多场耦合问题;涉及渗流场、扩散场和化学反应等多物理场。广泛存在的油藏非均质性要求对实际油藏进行粗化,在此过程中,粗化后的单元必须同时满足多物理场的等效替代;而且随着储层物性参数的变换粗化后的参数能进行相应的调整。利用单元测试的方法对二氧化碳混相驱和非混相驱过程中多物理场进行了动态粗化,取得了较好的粗化效果;该方法可以应用于相应的多场耦合粗化数值模拟研究。     

基于多物理场耦合的混凝土湿热变形数值模拟

为研究混凝土湿热耦合变形,基于混凝土微观组成结构特点,根据多物理场耦合作用和多孔介质湿热传输原理,建立了混凝土湿-热-力多物理场模型.并利用COMSOL数值仿真软件和提出的混凝土湿膨胀系数,在人机交互环境下,实现湿-热-力耦合数值求解.首先以Hundt试验为算例,验证了耦合模型和求解方法的可行性,然后利用该方法对某隧道混凝土湿热耦合变形进行了模拟计算.将多物理场耦合数值模拟结果与解析-有限元结合解法计算结果和现场光纤光栅监测结果对比表明,基于多物理场耦合的混凝土湿热耦合变形数值模拟更接近监测结果,更能反映实际物理过程且具备更好的通用性.     

关于多场耦合问题的几个概念探讨

从湍流脉动的高阶关联项以及湍流的雷诺方程出发,指出了动量场、能量场、质量场等相互耦合现象可以湍流脉动关联项和时均项中同时存在,并提高了脉动合和时间均耦合的概念,指出了在引入湍流模型即对雷诺时均方程使用湍流统计矩方程进行了封闭后,动量,能量及质量之间的耦合现象可由时均耦合来描述。介绍了多相耦合的概念及求解耦合问题的基本思路和方法。     

微波辅助生物柴油生产的多物理场耦合计算研究

多物理场耦合计算对于优化微波加热化学反应体系的生产工艺,避免热点和热失控带来的安全问题起到极其重要的作用。因此,本文首先将微波辅助生物柴油生产涉及到的电磁场方程、热传导方程和化学反应动力学方程进行相互耦合计算,然后依次分析微波功率、醇油摩尔比、反应温度、催化剂用量对生物柴油产率的影响,最终得到制备生物柴油的最优条件并对该条件下的电磁场和温度场分布进行分析。结果表明,在最优条件下,生物柴油产率高、温度分布均匀且无明显热点产生。     

地热多孔物料微波冷冻干燥过程的多物理场分析研究

以甘露醇与乳糖等为原材料,利用液氮制备冰激凌法,制备不同初始饱和度的地热多孔物料;通过多功能微波冷冻干燥装置,冷冻干燥处理制备的地热多孔物料,建立地热多孔物料干燥过程的多物理场分析模型,并设计对应的定解条件;通过COMSOL多物理场仿真软件,结合定解条件,求解多物理场分析模型,完成不同初始饱和度与不同微波功率等条件时的物理场分析,验证地热多孔物料微波冷冻干燥过程多物理场的影响。     

大功率植入器件经皮传能系统的温度场分析

依据经皮能量传输理论,在罐状变压器的基础上利用有限元软件的磁路耦合功能进行仿真,从而计算经皮变压器铁芯和线圈的损耗和体积生热率,通过电磁场、流固场、温度场的多物理场耦合,对变压器进行温度场分析;提出通过监测次级线圈的温升值进而调整初级线圈的输入功率来实现稳定植入器件的吸收功率的方法,使植入器件功率稳定在32W左右,大大提高了系统的稳定性和可靠性。     

大功率植入器件经皮传能系统的温度场

依据经皮能量传输理论,在罐状变压器的基础上利用有限元软件的磁路耦合功能进行仿真,从而计算经皮变压器铁芯和线圈的损耗和体积生热率。通过电磁场、流固场、温度场的多物理场耦合,对变压器进行温度场分析;提出通过监测次级线圈的温升值进而调整初级线圈的输入功率来实现稳定植入器件的吸收功率的方法,使植入器件功率稳定在32 W左右,大大提高了系统的稳定性和可靠性。     

关于ANSYS多物理场求解器MFX若干问题的讨论

针对典型的ANSYS+CFX多物理场求解过程,分析了多物理场数据交互平台MFX的基本工作原理。利用平板和水流相互作用的数值模拟算例,从分析流体域网格变形情况的角度讨论了建模边界条件设置等对流固耦合交界面数据交换的影响。研究结果表明建模的一致性对多物理场耦合的有效性和正确性有决定性的作用。本文的工作也可为多物理场双向耦合研究提供参考。     

和频过程中的超绝热演化与能量最大转换

基于准相位匹配技术和量子物理中的反向透热补偿方法,提出了一种超绝热条件下信号场能量完全转换成和频场能量的新方案.利用几何旋转面巧妙地揭示出系统附加反向透热补偿项的物理作用机理;类比弹性碰撞的物理过程,形象地说明了附加反向透热补偿修正项后系统能量转换的特性.借助于原子物理中的Bloch矢量法,清晰的展示了系统在超绝热条件下的演化过程,从新的角度图像化的揭示出体系捷径演化物理过程.利用这一新方案可优化系统的绝热演化过程、缩短耦合区间和非线性晶体长度,减少色散效应的影响,且可在较弱泵浦条件下实现高效的和频能量转换.该方案不仅为非线性光学器件的设计提供了一个很好的理论依据,而且其物理思想可普遍应用于多个领域.     

变色龙场论及其唯象研究进展

变色龙场是标量张量理论中的一种标量场,用以解释晚期宇宙的加速膨胀现象.与一般标量场不同的是,它与物质场的耦合使其有效质量如同变色龙一般随着周围环境(物质场能量动量张量的迹)的改变而改变.这一独特的变色龙机制使得变色龙场论在众多研究领域具有广泛应用.本文简要回顾变色龙场论,依次探讨它在早期宇宙、引力波观测、暗能量和暗物质统一方案以及光子-光子散射实验等方面的最新进展.     

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.     

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.     

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。     

A computer generator for randomly layered structures

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

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)

正~~     

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