首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
主要讨论了矩阵博奕中一类比较重要的博奕-有限资源博奕,将盖尔定理(1957)推广到“局中人1的最终支付值为以各阶段支付值为自变量的对称函数”,最后给出了一个例子来验证所给出的定理。  相似文献   

2.
学生模型(Student Model)是智能教学系统(Intelligence Tutoring System)施教的依据,建造阅读学生模型时需要确定阅读教学内容目标体系,并根据智能阅读教学系统的特点与功能,采取一定的策略建立基础学生模型与动态学生模型,语文智能阅读教学系统(CR-TS系统)的研制,主要探讨了如何通过对基础学生模型与动态学生模型中有关学习数据的修正,实现系统的教学目标。  相似文献   

3.
对回归模型y=β0+βlxl+...+βlxt,把Cp统计量推广到q≥1的情况,得到Cp=(2p-t-1)q+(n-t-q-2)tr〔(RSS)^-1(RSSx-RSS)〕,并讨论了Cp的若干统计性质。  相似文献   

4.
研究了超实数*R上的两种常用拓扑──Q-拓扑及S-拓扑的结构.证明了(*R,Q)是完全不连通的;*R中的Q-紧集只有有限集;*R中的每个银河都是(*R,S)的连通分支;*R中每一长度有限的区间(可以不是闭的)都是S-紧的;以及*R/≈既是(*R,Q)的上半连续分解,也是(*R,S)的上半连续分解等Q-拓扑及S-拓扑的一些基本性质.同时也纠正了前人关于Q-拓扑性质的一些错误结论.  相似文献   

5.
为了适应大规模集成器件制作工艺发展的需要,开展了液态金属离子源(LMIS)和聚 焦离子束(NB)的研究。研制成针型、同轴针型与毛细管型的镓与金LMIS,Au-Si、Au- Si-Be与 Pd-Ni-Si-Be-B三种共晶合金型 LMIS:研究了带有控制栅极的 LMIS的控 制性能;编制了计算聚焦离子枪所需的程序;制成三种型式的聚焦离子枪并获得0.1μm 直径的聚焦离子束;制成扫描离子显微镜(SIM);初步开展了刻蚀试验。  相似文献   

6.
Vidale—Wolfe微分对策广告模型   总被引:1,自引:0,他引:1  
广告竞争是市场竞争的重要形式,亦是目前营销活动中经常选用的竞争策略。在广告策划中,广告决策的选择过程本身就是一个对策过程。作者运用博奕论将著名的Vidal-Wolfe广告模型推广为微分对策广告模型,旨在量化阐明广告投入的市场运作“法则”,其结论可为解释当前有关广告竞争博奕方案的比较或选择提供新的理论支持。  相似文献   

7.
以中试湿壁塔为基础,一个通用型湿法烟气脱硫(WFGD)模型被发展。该模型包含一个总反应器模型和4个速率控制步骤,即SO2的吸收、HSO-3的氧化、石灰石的溶解和石膏的结晶。WFGD中所有重要的组分:SO2(g)、SO2(aq)、HSO-3、SO2-3、HSO-4、SO2-4、CO2(g)、CO2(aq)、HCO-3、CO2-3、Ca2+、CaCO3(s)、Mg2+、O2(g)、O2(aq)、CaSO4·2H2O、H2O、H+和OH-均在模型中被考虑。该建模方法可应用于其它类型湿法烟气脱硫装置的设计中。  相似文献   

8.
给出了一类具双线性发生率H(I,S)=λIS的SIRS模型 dI/dt=I.H(I,S)-(b+v)I, { dR/dt=vI-(b+λ)R 的定性分析,得到了一些具有实际意义的定性结果。  相似文献   

9.
从有交流的策略形式的博奕(strategic-form game)和有交流的贝叶斯博奕(Bayesian game)两个方面介绍了引入有交流的博奕(Game With Communication)的概念能极大地简化博奕模型,而且能够得出更易于分析的均衡解,并指出了有交流的博奕的概念在经济活动中设计激励相容的协调机制中的重要应用价值。  相似文献   

10.
关于拟常曲率空间的紧致极小子流形的积分不等式   总被引:1,自引:0,他引:1  
给出了拟常曲率空间紧致极小子流形的两个积分不等式,推广了前人在常曲率空间的相应结果.即:∫MS〔pn(c-2K)-S〕dV≥0,当K≤0时有∫MS〔pn(c-K)-S〕dV≥0;∫MS〔(2-1/p)S-n〕dV≥0  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
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.  相似文献   

14.
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。  相似文献   

15.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号