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1.
裴道武 《陕西师大学报》1995,23(4):12-16,20
模糊逻辑函数的计数至今仍是一个未解决问题,本文利用模糊逻辑函数析取范式的存在唯一性,引进基本片语集合,Aj,G(a)及G(a1,…Gk),推导出G(a),G(a1,…,ak)G(a)∩Aj以及G(a1,…,ak)∩Aj的计数公式,并给出了n元模糊逻辑函数的一个计数公式。  相似文献   

2.
设Cn〈a1,a2,…,ak〉是个循环图,t(G)是图G的支撑树数。本文利用第二类Chebyshev多项式给出了t(Cn〈1,3〉,t(Cn〈2,3〉),t(Cn〈1,2,3〉),t(Cn〈1,5〉),t(Cn〈3,5〉),t(C2n〈1,2,n〉)的公式。一个具体的例子表明,利用Chebyshev多项式的性质,即使n很大,这些公式的值是不难得到的。  相似文献   

3.
证明了图的逻辑积的色数公式x(G1∧G2∧…∧Gn)≤min{x(G1),x(G2),…,x(Gn)},边色数有并作如下猜想:x(G1∧G2∧…∧Gn)=min{x(G1),x(G2),…,x(Gn)}.  相似文献   

4.
以Jacobi多项式的零点作为插值的节点,构造了一个组合型的Bernstein多项式算子Cn(f,x).若f(x)∈Cj[-1,1],0≤j≤5,则Cn(f,x)对f(x)的逼近程度均达到最佳。即|Cn(f,x)-f(x)|=O1nj+1+1njωf(j),1n,(0≤j≤5).  相似文献   

5.
用半经验的紧束缚方法sp3s*计算了薄层应变超晶格(InxGa1-xAs)n/(GaAs)n(001)的电子结构.给出了组份X为0.53的超晶格(InxGa1-xAs)n/(GaAs)n的带隙值随层厚n的变化关系,以及超晶格(InxGa1-xAs)12/(GaAs)12的带隙值随组份X的变化关系.在得到超晶格能量本征值和本征函数的基础上,计算了该超晶格系统的光学介电函数虚部,并与体材料GaAs和体合金InxGa1-xAs的光学性质作了比较.计算结果表明,应变超晶格在较宽的能量范围有较好的光谱响应.  相似文献   

6.
记B是由1,2,…,n的循环排列组成的集合,A_3(n)=maxmin(a_(i+1)+a_(i+2)+a_(i+3)),其中i=0,1,2,….n-1,a_(n+1)=a_1,a_(n+2)=a_2;ai取1.2,…,n中的任意值,i=1,2,…,n.本文讨论了A_3(n)的上界:除n=3,5.6外,当3|n-1时,A3(n)≤ ;当3|n时,A3(n)≤ ;当3|n+1时.A_3(n)≤.  相似文献   

7.
用半经验的紧束缚方法sp^3s^*计算了薄层应变超晶格(InxGa1-xAs)n/(GaAs)n(001)的电子结构。给出了组份X为0.53的超晶格(InxGa1-xAs)n/(GaAs)n的带隙值随层厚n的变化关系,以及超晶格(InxGa1-xAs)12/(GaAs)12的带隙值随组份X的变化关系。在得到超昌格能量本征值和本征函数的基础上,计算了该晶格系统的光学介电函数虚部,并与体材料GaAs和  相似文献   

8.
以修正的Jacobi多项式算子的零点作为插值的节点,构造了一个“1/16”平均插值过程Cn(f,x).若f(x)∈Cj[-1,1],0≤j≤3,则Cn(f,x)对f(x)的逼近程度达到最佳,结论为|Cn(f,x)-f(x)|=O1nj+1+1njωf(j),1n(0≤j≤3)|Cn(f,x)-f(x)|=Oωφλf,1nδn(x)1-λ(0≤λ≤1)  相似文献   

9.
设a≤b是整数,G=(V(G),E(G)是一个图。G的一个支撑子图F称为G的一个[a,b]-因子,若对任意的υ∈V(G)有a≤dF(υ)≤b,图G称为是[a,b]-覆盖图,若对G的每一条边,存在G的一个[a,b]-因子包含它。本文给出了一个图的[a,b]-覆盖图的关于领域并的充分条件,得到了下列结果:设1≤a〈b是整数,G是一个阶为n的图,最小度δ(G)≥α且n≥2(a+b)(a+b-1)1/b如  相似文献   

10.
讨论了图G-v与G-e的星色数的一些基本性质,得到了一些不等式和等式,给出等式x(G)=X(G)成立的图G的一个特征,并进一步证明了X(W2n+1)=X(W2n+j1)=4从而回答了A.Vince提出的某些问题。  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.
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   

13.
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   

14.
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   

15.
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   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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   

19.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  相似文献   

20.
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   

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