有机聚合物塑料光纤的辐照特性

在分析了塑料光纤耐辐照机理的基础上,讨论了一种聚合物塑料光纤的辐照特性,该塑料光纤由一种改良的聚碳酸酯聚合物材料组成.用γ-射线、电子束、质子束三种辐射源分别对其进行照射.结果发现,在低剂量(<1kGy)辐照时,辐照后塑料光纤的透过率非但没有下降,反而有所上升,尔后随时间的推移,透过率趋于稳定值.在高剂量(>1kGy)照射时,辐照后透过率降低,随着时间的推移,透过率逐渐回升至稳定值     

PVG膜剂量计线性响应范围的估计

对辐射致色薄膜剂量计（ＰＶＧ）的辐照响应过程进行了研究，发现其剂量响应曲线上有一极大点，考查了隐色孔雀绿（ＬＭＧ）的极大转化率Ｃｅｘｔ与隐色孔雀绿（ＬＭＧ）和有机齿代物（ＲＸ）量含量的关系，进而讨论了ＰＶＧ膜剂量计线性响应范围的上限与膜中ＬＭＧ是含量的关系。在该体系中当ＬＭＧ量含量在２０～１００μｍｏｌ·ｇ＾－１范围内时，其线性响应范围时上限估计在１４０～１１０ｋＧｙ范围内。     

一个二元生成群的元素形式

讨论了具有定义关系ｘ－１ｙｘ＝ｙｋ（ｋ∈Ｚ）的二元生成群Ｇ＝＜ｘ，ｙ＞的元素形式．主要结论是Ｇ的元素能表示成形式ｘｍｙｎ（ｍ，ｎ∈Ｚ）当且仅当ｋ＝±１或ｙ的阶有限；当且仅当＜ｙ＞Ｇ．     

A Two species Mutualistic Model on the Basis of Generalized Logistic Model

以广义Ｌｏｇｉｓｔｉｃ方程ｄｘｄｔ＝μｘｘｍ－ｘｘｍ＋（ｋ－１）ｘ（μ,ｋ,ｘｍ为常系数）为基础,推广了Ｍａｙ－两种群互惠模型ｄｘｄｔ＝μ１ｘ［１－ｘｘｍ＋α２ｙ］ｄｙｄｔ＝μ２ｙ［１－ｙｙｍ＋α１ｘ］用方程ｄｘｄｔ＝μ１ｘｘｍ＋α２ｙ－ｘｘｍ＋α２ｙ＋（ｋ１－１）ｘｄｙｄｔ＝μ２ｙｙｍ＋α１ｘ－ｙｙｍ＋α１ｘ＋（ｋ２－１）ｙ描述两种群互惠共存．当ｋ１＝ｋ２＝１时,该方程化为Ｍａｙ－两种群互惠模型,当Ｙ＝０时,该方程化为广义Ｌｏｇｉｓｔｉｃ方程,我们证明了,当α１α２＜１时,该系统存在唯一的正平衡点,当α１＜１,α２＜１,０＜ｋ１＜１,０＜ｋ２＜１时,正平衡点局部渐近稳定;当α１α２＜１,ｋ１１,ｋ２１时,正平衡点在０＝｛（ｘ,ｙ）｜ｘ＞０,ｙ＞０｝上全局稳定,并讨论了系数的生态意义及确定方法．     

以广义Logistic方程为基础的两种群互惠共存数学模型

以广义Ｌｏｇｉｓｔｉｃ方程ｄｘ／ｄｔ＝μｘｘｍ－ｘ／ｘｍ＋（ｋ－１）ｘ（μ,ｋ,ｘｍ为常系数）为基础,推广了Ｍａｙ－两种群互惠模型ｄｘ／ｄｔ＝μ１ｘ「１－ｘ／ｘｍ＋α２ｙ」 ｄｙ／ｄｔ＝μ２ｙ「１－ｘ／ｙｍ＋α１ｘ」用方程ｄｘ／ｄｔ＝μ１ｘｘｍ＋α２ｙ－ｘ／ｘｍ＋α２ｙ＋（ｋ１－１）ｘ ｄｙ／ｄｔ＝μ２ｙ／ｙｍ＋α１ｘ－ｙ／ｙｍ＋α１ｘ＋（ｋ２－１）ｙ描述两种群互惠共存,当ｋ１＝ｋ２＝１时,该方程     

MgSO4:Dy,Mn磷光体的热释光和ESR特性研究

通过双掺杂制备杂质浓度不同的ＭｇＳＯ４：Ｄｙ,Ｍｎ磷光体,经＾６０Ｃｏγ辐照后,研究其热释光（ＴＬ）发光曲线、热释光动力学特微参量,热释光剂量响应和电子自旋共振（ＥＳＲ）谱,从ＴＬ发光曲线观察到ＭｇＳＯ４：Ｄｙ,Ｍｎ只有一个在３８℃附近的主剂量峰,辐射剂量响应（０．１Ｇｙ－２０ｋＤｙ）为超线性,并观测到热释光剂量响应的非线性特性与磷光体中掺入的Ｍｎ浓度相关,在室温下测量了掺入不同Ｍｎ浓度的ＭｇＳＯ     

Schottky结构半导体粒子探测器的辐射测试

提出一种金属－半导体－金属Ｓｃｈｏｔｔｋｙ结构的粒子探测器，它用高迁移率，半缘绝的Ⅲ－Ⅴ族化合物半导体ＧａＡｓ为材料制成大面积的粒子探测器。经过能量为１．５ＭｅＶ，剂量分别为５００ｋＧｙ和１ＭＧｙ的电子辐射和剂量分别为３００ｋＧｙ和５００ｋＧｙ的＾６０Ｃｏγ射线辐射，探测器能正常工作，是一种新型的经得起强辐射的粒子探测器。     

γ辐射致SlNPV的DNA链断裂研究

提出了用琼脂糖凝胶电泳法，分剂量进行两次电泳利用标准ＤＮＡ将各段连接的方法，在１－１００ｋＧｙ宽剂量范围，测定＾６０Ｃｏγ射线辐照后ＤＮＡ单链和双链断裂频率，得出ＤＮＡ链断裂频率与吸收剂量的关系。     

关于不定方程y（y＋1）（y＋2）（y＋3）=p^2kx（x＋1）（x＋2）（x＋3）

证明了不定方程ｙ（ｙ＋１）（ｙ＋２）（ｙ＋３）＝ｎｘ（ｘ＋１）（ｘ＋２）（ｘ＋３）在ｎ＝ｐ＾２ｋ（ｐ为质数ｋ为自然数）时无正整数解。     

在类奇异非线性两点边值问题正解的存在唯一性

研究了一类奇异非线性两点边值问题－ｙ″＝ｆ（ｘ，ｙ），０≤ｋ＜ｘ＜１，ｙ′（ｋ）＝Ｃ，ｙ（１）＋Ｄｙ′（１）＝η（Ｄ＞０）的正确的存在性和住性，其中假定函数ｆ（ｘ，ｙ）关于变量ｙ具有奇性（ｌｉｍｆ（ｘ，ｙ）＝＋∞）。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has