超晶格电子Bloch振荡过程中的能量转化与守恒

讨论了超晶格电子无阻尼Bloch振荡过程中的能量转化与守恒，并对其机制以及负电阻效应给以定性解释。结果表明：超晶格电子在任一时刻的能带能量的增加（或减小）等于电子静电位能的减小（或增加），超晶格电子的总能量在振荡过程中保持不变，能量守恒与转化对超晶格负阻效应产生重要影响。     

微波击穿中压强对电子弛豫过程的影响

通过联立电子密度和电子能量随时间的演化方程构建全局模型,对不同压强下高功率微波(HPM)脉冲氩气击穿及电子弛豫过程进行了研究。计算了不同压强下的氩气击穿阈值,其与粒子模拟蒙特卡罗碰撞(PIC/MCC)法预测的结果符合得很好。通过引入复合率和扩散率的经验表达式,得到了不同压强下,弛豫过程中电子密度和电子能量随时间的变化。结果表明,氩气击穿发生后,电子密度先经历短暂的增长后逐渐下降,且压强越高,电子密度的最高值越低。在电子弛豫过程中,随着压强的增加,电子密度下降得更慢,而电子能量减小得越快。     

环境气体种类对烧蚀粒子输运动力学的影响

为深入理解纳米硅(Si)晶粒的成核机理,实现纳米Si晶粒的均匀可控,采用蒙特-卡罗(MonteCarlo)模拟方法,对脉冲激光烧蚀单晶Si靶沉积纳米Si晶薄膜过程中烧蚀粒子在环境气体中的输运动力学过程进行了模拟,并研究了环境气体种类对烧蚀粒子时空分布的影响.研究结果表明,当环境气体种类确定时,随着时间的推移,烧蚀粒子强度分布的峰值右移;并且在He环境气体中烧蚀粒子的传播距离最大,在Ar环境气体中烧蚀粒子传播距离最小;随着距靶的距离增加,烧蚀粒子的强度减小,在Ne环境气体中传输的烧蚀粒子出现二次强度峰的时间最早,并且强度峰值最大.     

低气压直流氩气辉光放电的数值模拟研究

建立了一维氩气直流辉光放电自洽流体模型,采用对流与扩散方程来描述带电粒子在间隙中迁移、扩散以及电子的能量变化过程,并考虑了空间电荷对电场的影响以及离子撞击阴极产生的二次电子发射作用.采用有限元法对放电模型进行数值求解,得到了放电电流随时间的演化波形,以及放电稳定后带电粒子的浓度与总通量密度的空间分布,同时也求得了电子能量与电场的空间分布.计算结果表明:加压25μs后,放电逐渐趋于稳定状态;当放电稳定后,在阴极位降区附近,离子密度比电子密度高几个数量级,在正柱区附近两者浓度几乎相等;电子能量在阴极位降区内达到峰值29 eV,而在负辉区及正柱区几乎保持不变;放电电流密度在阴极位降区主要由流向阴极的氩离子及其产生的二次电子所贡献,而在负辉区和正柱区,电子成了放电电流密度的主要贡献者.     

有关电子通信工程成本管理的思考

随着信息化进程的不断推进和发展,通信工程在人们的日常生活中发挥着越来越重要的作用.但是从我国目前电子通信工程的现状来看,其在建设过程中还存在很多问题需要改革和创新.随着我国市场经济的不断推进和发展,通信工程建设也面临着越来越激烈的市场竞争,要想在激烈的竞争中脱颖而出,电子通信工程应用该控制好建设过程中的每一个细节.本文笔者将在分析电子通信工程成本管理存在问题的基础上,为做好电子通信工程成本管理提供几点意见,以促进我国电子通信工程的健康、稳定发展.     

制冷系统启动过程电子膨胀阀的控制

通过分析热力膨胀阀启动过程的特点，发现可能出现过热度长时间为零的情况，为此，将零过热度时间作为一个重要的指标，用于电子膨胀阀的启动控制，提出了制冷系统启运过程中改善零过热度时间以及兼顾其他性能指标的电子膨胀阀的启动控制策略，取得了比较满意的结果。     

20～21世纪的世界科学革命——钟平东原子核模型

经过47年的理论研究和实验研究，笔者提出新的原子核模型：①稳定原子核和粒子：电子、质子、α粒子是稳定的粒子，质子和α粒子是稳定的原子核。     

SF6-CO2混合气体中电子输运特性的蒙特卡洛模拟

在Ｅ／Ｎ＝ １９２～４１８ ｚＶ·ｍ ２（Ｅ为电场,Ｎ 为气体密度）范围内,采用蒙特卡洛法模拟了ＳＦ６－ＣＯ２ 混合气体的电子崩发展．求出了电子能量分布随Ｅ／Ｎ 和ＳＦ６ 含量Ｋ 的变化规律,并求出了在不同Ｅ／Ｎ 下的有效电离系数α、临界耐电强度随Ｋ 的变化规律,且与实验值作了比较和分析．     

期刊电子数据库建设中的著作权保护

随着电子期刊的著作权纠纷逐渐增多,现有的著作权法已经滞后于技术的发展。本文从我国的典型判例入手,通过分析期刊电子数据库信息的著作权归属,进而探讨期刊电子数据库信息建设过程中获取著作权的诸多困难与现实选择,最后由此提出解决期刊电子数据库著作权问题的法律设想。     

载能粒子与基底上方二维电子气间的相互作用

采用线性化量子流体动力学模型,研究了载能粒子与存在基底情况下二维平面电子气间的相互作用,讨论基底介电常数对扰动电子气密度、入射粒子所受阻止力及侧向力的影响。结果表明,随着基底介电常数的增大,扰动电子气密度振荡的波长变大,在入射粒子速度较低时,介电常数对其所受阻止力和侧向力几乎无影响,而在速度较高时影响很大。     

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.     

A computer generator for randomly layered structures

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

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.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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