大理石中矿物优选方位对石材抗压强度的影响

本文通过几种不同类型的大理石中矿物晶体优选方位的岩组分析，并根据其组构特征选择石料的切面方向，得出了矿物排列方向影响石材抗压强度的肯定性结论；反映了进行岩石结构构造研究在石材加工中的意义；论证了利用大理石中矿物优选方位来确定石材锯极方位以获得较大抗压强度的可行性；提出石材加工中注重岩石内部结构研究的必要性。     

基于图象处理的岩石组构测定方法

鉴于传统的岩石组构测量方法比较繁琐，提出了一种基于图象处理的岩石组构测定的新方法。此方法可将图象x-y平面内比较难测量的方位角转化到Hough域θ-θ坐标下，统计分析各个方位角，判断是否存在优选方位并计算岩组的优选方位角，Hough域的叠加值反映了对颗粒方位角识别的置信度；对于一些细微的、离散的岩石颗粒进行统计分析，给出矿物颗粒偏光性的解决方法。实际资料处理结果表明，相对于传统测量方法，采用基于图象处理的方法对岩石组构进行测定，其抗噪性好，减少了在目测过程中产生的误差，提高了岩组测量效率，能在岩石构造分析中获得更多、更准确的地质信息。     

塔山大理石矿床特征和性能

作者通过对塔山大理石矿床地质特征的分析，研究了岩石的矿物成分、化学成分和物理、力学性质。研究结果表明，塔山大理石装饰性能优良，具有较高的开发利用价值。     

石材抛光面光泽度不均匀问题剖析

从岩石的矿物组成、结构和抛光工艺及参数等方面对石材抛光面光泽度不均匀问题进行了剖析。指出了岩石的矿物组成、结构和矿物的蚀变、风化是导致光泽度不均匀且是无法消除的内部因素；针对如何消除抛光工艺及参数对光泽度均匀性产生的影响，提出了合理的磨头进给路线和进给间距     

基于图象处理的岩石组构测定方法

鉴于传统的岩石组构测量方法比较繁琐,提出了一种基于图象处理的岩石组构测定的新方法。此方法可将图象x y平面内比较难测量的方位角转化到Hough域ρθ坐标下,统计分析各个方位角,判断是否存在优选方位并计算岩组的优选方位角,Hough域的叠加值反映了对颗粒方位角识别的置信度;对于一些细微的、离散的岩石颗粒进行统计分析,给出矿物颗粒偏光性的解决方法。实际资料处理结果表明,相对于传统测量方法,采用基于图象处理的方法对岩石组构进行测定,其抗噪性好,减少了在目测过程中产生的误差,提高了岩组测量效率,能在岩石构造分析中获得更多、更准确的地质信息。     

陨石高压矿物学研究为地球板块俯冲带高压相转变机制提供新认识

橄榄石是石陨石和地幔的主要造岩矿物之一,它在高温高压条件下转变为高密度的似尖晶石(wadsleyite)和尖晶石(ringwoodite,林伍德石)矿物多形.橄榄石的高压相转变机制对认识地球和星球内部物质组成、结构以及地球动力学等具有极其重要的科学意义.高温高压实验研究表明,橄榄石的高压相转变可以经由颗粒边界成核生长,或沿晶体内部特殊方位成核生长而转变为高压相.然而,过去在天然岩石(受冲击陨石)中,仅发现通过颗粒边界物质扩散作用形成的林伍德石多晶集合体,一直未能观测到在橄榄石晶体内部发生的林伍德石片晶状成核生长的相转变现象.     

论岩组工作中确定构造要素的简单方法

岩组分析的基本目的,是为了了解岩石在漫长的地质年代中所经历的历史,也就是它受力的历史。在构造力的作用下,岩石发生形变乃至破裂,都将引起构成岩石的矿物内部发生变化,而岩组分析则可准确地测量出岩石受力的方位和各种构造要素。然而,岩组工作却存在着下述三个问题:①由于岩组工作是利用概率统计的方法,     

硅质板抛光工艺的研究

抛光是大理石加工中极重要的一道工序,它直接影响加工后的表面光泽度。本文针对一种难以抛光的石材——硅质板的抛光问题进行了理论分析和试验研究,提出了一种能量显著提高硅质板表面光泽度的抛光工艺方法。     

金川矿区岩石的膨胀和软化特性试验及分析

基于金川矿区岩体较破碎、岩石属高地应力碎胀蠕变岩,使用自由膨胀率测试仪测定金川岩样的自由膨胀率及含水率,再通过岩石抗压试验测定水对岩石强度和弹性模量的影响。研究结果表明:岩石类型不同,其膨胀率也不相同,Ⅰ类大理蚀变岩试样膨胀率不大,平均为0.051%;Ⅱ类角闪二灰橄榄岩的膨胀率则较大,平均为0.140%;矿岩遇水软化,内部产生膨胀应力,造成岩石抗压强度降低20 MPa左右,破坏时不属于脆性破坏,其原因可能是其中的黏土矿物吸水,除有部分水进入黏土矿物晶格内外,还有一部分吸附在层理面附近矿物颗粒上,当受力压缩时,水受压排出产生压密。     

岩石光泽度的实质及其计算公式

根据晶体光学导出了岩石光泽度的理论计算公式，分析了岩石加工表面微观几何不平度对反射光的影响，提出了反射系数的概念，修正了理论计算公式。这些公式揭示出了各因素影响光泽度的内在规律，具有一定的理论和实用价值。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with