三角范畴中的函子有限子范畴

基于函子有限子范畴的重要性,利用图追踪的方法,从mutation对出发,得到了一类函子有限子范畴,具体而言是,设T是一个三角范畴且带有Serre函子,D是T中的一个函子有限的刚性子范畴.如果(X,Y)是一个D-mutation对,则X是T中的函子有限子范畴当且仅当Y是T中的函子有限子范畴.     

函子范畴与范畴的平凡扩张

设C为小范畴,D为预加法范畴,根据范畴D上自加法函子F,定义函子范畴F上自加法函子f,并给出一族范畴同构(D∝F)C≌D∝F     

范畴中的拟-morphic对象

本文引入了范畴中的拟-morphic对象,给出了其在p-exact范畴Abelian范畴中的一些性质。主要证明设A是p-exact范畴中的拟-morphic对象,则A的任一子对象均同构于A的一个像当且仅当A的任一像均同构于A的任一子对象;设C和D是Abelian范畴,F:C→D是完全忠实正合函子,且A∈Ob C,则A是拟-morphic的当且仅当F(A)是拟-morphic的。     

商范畴与hom函子

设R是有单位元的环,r=(T,F)是左R-模范畴R-mod上的遗传挠理论,R-mod/F是由遗传挠理论τ的挠类T所决定的R-mod的商范畴.设M、N是左R-模,则从M到N的所有τ-态射(即Rmod/T中的态射)的集合构成一个Abel群,用hom_R(M,N)表示.首先,说明了hom函子是从R-mod到Abel群范畴的左正合加法函子.其次,利用hom函子的正合性刻画了商范畴R-mod/T中的投射对象与内射对象.最后,证明了τ是正合挠理论当且仅当自然函子J:R-mod→R-mod/T保持投射对象不变.     

具有与星正交的(g,f)-因子分解的子图

设 G是一个图 ,用 V(G)和 E(G)表示它的顶点集和边集 ,并设 g(x)和 f (x)是定义在 V(G)上的两个整数值函数 ,且对任意的 x∈ V(G)有 0≤ g(x) 相似文献   

Cluster倾斜子范畴导出的Abel范畴的recollement和thick子范畴

设T是三角范畴D的cluster倾斜子范畴.首先,如果D具有一个关于三角范畴D′和D″的recollement,且满足i*i*(T)T,j*j*(T)T,则给出了这个recollement诱导Abel范畴D/T关于Abel范畴D′/(i*T)和D″/(j*T)的recollement的充分必要条件;其次,如果H是D的thick子范畴,i*表示自然嵌入函子i*:H→D的左伴随函子,且i*TT,那么Abel范畴A′=H/(i*T)是Abel范畴A=D/T的thick子范畴.     

满忠实函子诱导的三角范畴中心间的态射

设(F,ξ):C→D为三角范畴间的满忠实三角函子,Z*(C)和Z*(D)分别为三角范畴C和D的分次中心。则F自然诱导了从一个分次同态珘F:Z*(D)→Z*(C),且给出了珘F的具体形式。     

与任意图(m,r)-正交的(g,f)-因子分解

设G是一个图,用V(G)和E(G)分别表示它的顶点集和边集,并设g(x)和f(x)分别是定义在V(G)上的非负整数值函数,且对每个x∈V(G)有g(x)相似文献   

k上G-分次范畴的平凡扩张

设G为群,X为k上G-分次范畴.在定义C上k-函子F的基础上,证明了平凡扩张范畴C∝F仍为k上G-分次范畴;当F为X上分次k-函子时,给出了一族范畴同构,即r∈N(G),有(C#G)∝(F#r)(C∝F)r#G.     

与任意图2-正交的(g,f)-因子分解

设G是一个图，用V(G）和E(G）表示它的顶点集和边集，并设g(x）和f(x）是定义在V(G）上的两个整数值函数，且对每个x∈V(G），有4≤g(x)≤f(x)，则图G的一个支撑子图F称为G的一个（g，f）-因子，如果对每个x∈V(G)，有g(x)≤dF(x)≤f(x)。图G的（g，f）-因子分解是指E(G）能划分成边不交的（g，f）-因子，设F={F1,F2,…,Fm}和H分别是图G的因子分解和子图，若对所有1≤i≤m有|E(H)∩E(Fi）|=2，则称F和H2-正交。本文证明：若G是一个（mg m-1，mf-m 1）-图，H是G中任一有2m条边的子图，则G有一个（g，f）-因子分解与H2-正交。     

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.     

《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