C~(q )离子与Ar原子碰撞反应过程中转移电离的研究

应用位置灵敏探测和飞行时间技术,测量了Cq (q=1,2,3)离子与Ar原子碰撞反应中的转移电离截面与单电子俘获截面之比,并与DuBois的Heq (q=1,2)与Ar的实验结果进行比较.同时在玻尔的过垒模型基础上,给出进一步的定性解释。     

离子与原子碰撞多体动力学过程成像研究

分析了反冲离子动量谱仪的成像原理,较详细地讨论了成像探测器技术、反冲离子和电子飞行时间谱仪、超声气体装置和均匀约束磁场等技术的要求和特点,介绍了在中国科学院近代物理研究所ECR离子源原子物理束流线上建造的反冲离子动量成像谱仪．给出了在该谱仪上首次实验测量的部分结果,得到了30keV He^2＋离子与He原子碰撞反应中单电子俘获的末态分布截面,发现在本实验能区,单电子俘获到第一激发态是主要反应道;测量到的角微分截面结果表明,基态电子俘获发生在大碰撞参数,激发态单电子俘获主要发生在小碰撞参数的情况下;这些结果是由亚飞秒碰撞过程成像技术取得的．最后讨论了反应成像谱仪在其他领域中的潜在应用前景．     

Cq＋离子与Ar原子碰撞反应过程中转移电离的研究

应用位置灵敏探测和飞行时间技术,测量了C^q＋（q=1,2,3）离子与心原子碰撞反应中的转移电离截面与单电子俘获截面之比,并与DuBois的He^q＋（q=1,2）与Ar的实验结果进行比较．同时在玻尔的过垒模型基础上,给出进一步的定性解释．     

电子碰撞K壳层电离截面的理论研究

基于相对论的电子离子碰撞的K壳层的电离截面理论,计算了原子C、Al、Ca、Ti、Cu、Ge、Mo、Ag、Au、Pb电子离子碰撞电离截面,并分析了其随入射电子能量和电子温度的变化趋势,所得的计算结果和其它理论值和近期的文献实验数值进行了比较,计算结果可为Kα光子产额与超热电子数额和能量模拟提供原子参数.     

稀土离子^144Nd^＋和H2分子碰撞的单电子俘获截面的测量

建立了一套用于单价离子与气体分子碰撞的单电子俘获截面测量的装置,用复旦大学加速器实验室的３０ｋｅＶ同位素分离器测量了１０－３０ｋｅＶ＾１４４Ｎｄ＾＋与Ｈ２碰撞的单电子俘获截面。     

快速α粒子与类氢离子He￣ 、Li￣(2 )碰撞中电子俘获到激发态的研究

基于ＯＢＫ近似得到的快速α粒子与Ｈｅ＋和Ｌｉ２＋离子碰撞中，电子俘获到激发态与基态的分截面比值及ＣＤＷ方法得到的电子俘获到基态的截面，计算了这两种碰撞中电子俘获到激发态的分截面和电子俘获的总截面，并对所得的结果进行了讨论．     

快速α粒子与类氢离子He^＋,Li^2＋碰撞中电子俘获到激？…

基于ＯＢＫ近似得到的快速α粒子与Ｈｅ＾＋和Ｌｉ＾２＋离子碰撞中,电子俘获到激发态与基态的分截面比值及ＣＤＷ方法得到电子俘获到基态的截面,计算了这两种碰撞中电子俘获到激发态的分截面和电子俘获的总截面,并对所得的结果进行了讨论。     

亚稳态离子的电子碰撞电离截面

利用扭曲波玻恩交换近似方法计算了类氖Ｓｉ＾４＋离子的基态和亚稳态的电子碰撞直接电离截面和激发自电离截面，通过比较，指出了亚稳态离子电离贡献的重要性；在考虑亚稳态离子贡献的情况下，对最近首次给出的Ｓｉ＾４＋离子的电子碰撞电离实验结果给出了合理的解释。     

正电子碰撞氦原子电离截面的理论研究

文中运用具有耦合通道靶函数的新库仑扭曲波方法用来计算正电子碰撞氦原子电离截面.除此之外,还采用的类氢原子的Slater轨道波函数来描述氦原子的初态波函数.入射电子的能量在电离阈值和500a.u之间变化.理论计算结果与实验数据和其他理论计算结果符合较好.而且与其他复杂的畸变波方法相比,文中的理论模型更容易实现,并能给出更为准确的结果.     

高电荷态氩离子与Ne原子碰撞过程中的转移电离截面的研究术

采用符合关联实验技术进行的Ar^q Ne(q=8，9，11，12)碰撞体系中多电子转移过程的研究。在实验上鉴别了反应中各种电子转移过程，并测量了转移电离截面．研究了转移电离截面与反冲离子电荷态的关系，并利用修正后的分子过垒模型计算结果与实验结果进行了对比分析，计算结果较合理地描述了实验现象．     

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.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-