杠杆挠度曲线的Fredholm积分方程解法

在L1空间通过构造格林函数把棒挠度曲线微分方边值问题转为求第二类Fredholm积分方程的特征值.通过离散纵标法解出矩阵的特征值,该方法提高了特征的值计算速度与精度.     

微机化精密测试系统的研制

采用微机化的精密测试系统,记录铸铁及铝合金的热分析及微分热分析曲线,提取特征值,在三分钟内可预报铸铁及铝合金的机械性能和成份。本文介绍了测试系统的硬件部分以及由CBASIC与汇编语言交叉使用为本系统提供的软件。     

同位镀汞电化学溶出多次半微分电分析法的研究

本文提出同位镀汞薄膜电极阳极溶出过程中电流的1.5次和2.5次微分对电极电位曲线的理论.推导出其相应的理论曲线和有关方程,研究了有关特性,并用实验加以验证,结果与推导相符.从而建立了测定海水中痕量重金属的1.5次微分电化学溶出法,其灵敏度和分辨率都比半微分法更佳.     

正则微分算子带权第二特征值的上界

考虑某类正则微分算予的带权第二特征值上界估计的问题。利用试验函数、分部积分、Rayleigh定理和不等式等方法与技巧,得到了用正则微分算子的第一个特征值来估计第二个特征值的不等式,其估计系数与区间的几何度量无关。其不等式在物理学和力学中应用广泛．在微分方程的理论研究中起着重要的作用。     

一类高阶左定微分算子的谱

研究了一类高阶左定微分算子的谱,利用左定微分算子与右定微分算子的关系,得到结论:自伴边界条件的高阶左定微分算子的特征值均为实数,而且上无界下无界,且算子的特征值可以排序为…λ-2λ-1λ-0<0<λ0λ1λ2…     

多项式微分算子带一般权第二特征值的上界估计

考虑多项式微分算子带一般权第二特征值的上界估计的问题.利用试验函数、分部积分、Rayleigh定理和Schwarz不等式等方法与技巧,得到了用多项式微分算子的第一个特征值来估计第二个特征值的不等式,其估计系数与区间的几何度量无关。其不等式在物理学和力学中应用广泛,在微分方程的理论研究中起着重要的作用。     

任意阶微分算子带一般权第二特征值的上界估计

考虑某类任意阶微分算子带一般权第二特征值的上界估计的问题。利用试验函数、分部积分、Rayleigh定理和Schwarz不等式等方法与技巧,得到了用任意阶微分算子的第一个特征值来估计第二个特征值的不等式,其估计系数与区间的几何度量无关。其不等式在物理学和力学中应用广泛,在微分方程的理论研究中起着重要的作用。     

基于随机密度矩阵特征值联合分布的广义微分熵研究

研究了基于随机密度矩阵特征值联合分布的广义微分熵。首先,在罗莱珍等人的论文基础上,计算在Wishart矩阵特征值联合分布下的广义微分熵;然后,采用Laplace变换和Laplace逆变换来计算在随机量子态特征值联合分布下以及在随机密度矩阵对角线联合分布下的微分熵;另一方面,研究了由随机量子态所诱导的相关随机矩阵模型,该模型在量子信息理论中有着重要的作用;最后,以Renyi熵和Tsallis熵为例来验证在3种情形下的广义微分熵,并推广了罗莱珍等人的结果。     

一类四阶Sturm-Liouville问题的特征值

研究了一类四阶Sturm-Liouville问题的特征值关于区间端点、边界条件、方程系数及权函数的连续性和可微性,给出了特征值关于这些参数的微分表达式.     

2s和2t阶联立微分方程组次特征值的估计（英文）

考虑2s和2t阶阶联立微分方程组在Dirichlet和Neumann边界条件下广义特征值的含权估计,此问题由钱椿林教授提出,是某类六阶微分系统特征值问题的自然延伸,所用方法是Hile和Yeh方法的改进和推广,可用于估计重调和算子等的特征值,笔者引入向量和矩阵符号,运用SturmLiouville关于特征值和特征函数空间的定性理论,利用矩阵运算、分部积分、试验函数和Schwartz不等式等具体方法,获到了用主特征值来估计次特征值的显式上界不等式,且其估计系数与所论区间的度量无关,其结论是文献定理的进一步推广.     

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。     

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.     

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     

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