无限长载流螺线管磁场分布特点的证明

由载流圆环的磁场和安培环路定理严格证明了无限长载流螺线管的磁场分布特点，即管内是均匀磁场、管外磁场为零；指出无限长载流螺线管的磁场是不能仅由安培环路定理求出的。     

无限长螺线管内外感生电场计算中存在的一个问题

本文从感生电场与磁场的相似性和感生电场遵循的场方程两个方面,对无限长螺线管内磁场变化激发的感生电场只有切向分量做了较为严格的论证。     

无限长螺线管内外磁场研究

本文在书载流密绕无限长螺线管导线中电流视为均匀分布在螺线管表面的面电流情况下,可以定量计算出螺线管内外磁场大小。     

无限长通电螺线管内磁场与其截面形状无关的证明

建立柱坐标系,利用毕奥—萨伐尔定律和矢量微积分,首先求出任意形状载流线圈任一点磁感应强度的一般表达式;然后在特定的条件下得出载流圆线圈轴线上的磁感应强度;最后利用场强叠加原理对任意形状载流线圈任一点磁感应强度的一般表达式进行矢量积分,得出截面为任意形状无限长通电螺线管内的磁感应强度与截面为圆形无限长通电螺线管内的磁感应强度具有相同的表达式,从而得出无限长通电螺线管内的磁场与其截面形状无关的结论.     

载流螺线管磁场的全空间解

针对普通物理学中螺线管模型不能说明的无限长载流密绕螺线管外的磁感应强度不为零的问题,提出建立与实际更接近的螺线管模型,进而计算出其全空间的磁感应强度。     

一种有意义的载流模型

本文在Basab B.Dasgupta和Victor Namias等人关于任意形状长直螺线管磁场的讨论基础上,提出了一种有意义的载流模型:无限长横向载流片。给出了该载流模型在空间任意点的磁场公式,并以它为工具,简化了异形长直螺线管磁场的计算。     

圆环与螺线管之间电磁相互作用力的精确计算

该文首先简扼给出载流园环的矢势和两载流圆环的相互作用力。然后， 在此基础上构思巧妙地计算出圆环与螺线管之间的相互作用力。     

无限长密绕载流螺线管外的磁场

螺线管是用一根长直导线绕成密集排列的螺旋线圈组成的,无限长密绕载流螺线管内的磁场可通过极限方法求出,但管外的磁场,教材却没有仔细讨论,本文着重分析关解决这个问题。     

载流疏绕有限长螺线管内轴线上的磁场

讨论了有限长载流疏绕螺线管内轴线上的磁场,并与载流密绕螺线管内轴线上的磁场作了比较．用此分析方法可以求得较完整的载流螺线管内的磁场分布．     

也谈无限长载流螺线管的磁场

近年来“大学物理”多次发表了“无限长载流螺线管的磁场”的有关文章,这些文章概括起来存在以下两方面问题:(1)推导仍太繁,冲淡了对主要问题的探讨;(2)错误地得出了轴向面电流密度随倾角α的增大而减少这一结论。本文用更简单易懂的方法,论证“无限长载流螺线管轴向和环向面电流密度、面电流强度与倾角α的关系。从而更清晰地分析出单层、多层螺线管内、外磁场与电流的关系。此方法物理概念清楚,更便于掌握。可提供普通物理教学有关部分的参考。     

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.     

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.     

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

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with