一类时延细胞神经网络的全局渐近稳定性

讨论时滞的细胞神经网络(DCNNs)的全局渐近稳定性,利用Lyapunov泛涵方法和平均值不等式,a1a2…ak≤1/k(ak1+ak2+…+akk)(a1＞0,i=1,2,3,…,k),构造了一类新的Lyapunov泛涵,再次对DCNNs的稳定性进行了研究.得到了DCNNs全局渐近稳定时的一些充分条件,给出了保证时滞细胞神经网络全局渐近稳定的模型设计方法.     

具有漏泄时滞和时变区间时滞的递归神经网络新的稳定性准则

研究了具有漏泄时滞和时变区间传输时滞的递归神经网络的渐近稳定性问题.基于Lyapunov-Krasovskii(L-K)稳定性理论.Jensen不等式和互惠凸方法,得到了线性矩阵不等式(LMIs)表示的新的稳定性准则.相对于现存的方法,避免利用保守性较大的中立型变换,且在构造L-K泛函时充分利用了漏泄时滞和传输时滞的关联信息,因此所得准则具有较小的保守性.数值例子验证了所得结果的有效性和较小保守性.     

时滞细胞神经网络的指数稳定性

研究了时滞细胞神经网络(DCNNs)平衡点的全局渐近稳定性,去掉了有关文献中关于激活函数的有界性、单调性和可微性的条件,运用拓扑度理论和M-矩阵理论给出了更弱的判定平衡点的存在唯一性及全局指数稳定性的条件.     

双向联想记忆(BAM)神经网络系统的指数稳定性

研究一类具有分布时滞的双向联想记忆(BAM)神经网络系统的指数稳定性.通过构造合适的Lyapunov泛函并利用不等式分析技巧,得到了保证系统平衡点全局指数稳定的充分条件.所得结果是新的,不同于先前已有的一些结果.最后通过数值例子说明了所得结果的可行性和有效性.     

具有分布时滞的脉冲Cohen-Grossberg神经网络的指数稳定性

利用非负矩阵的谱半径和M-矩阵的性质,以及不等式分析技巧研究了具有分布时滞和脉冲的Cohen-Grossberg神经网络,得到了其平衡点存在性和指数稳定性的充分判据,结果去掉了放大器函数αi(s)(i=1,2,…,n)的上界限制,从而推广了一些文献的结果.     

具时滞离散和分布BAM神经网络的全局渐近稳定性

研究一类同时具离散时滞和分布时滞的BAM(bidirectional associative memory)神经网络平衡点的全局渐近稳定性问题.所给BAM模型对激活函数做了扇形非线性条件假设,利用M矩阵理论,通过构造新的LyapLlnov函数并利用一些分析技巧,获得具时滞离散和分布BAM神经网络的全局渐近稳定性的充分条件.数值例子说明了所得结果的有效性.     

一类含有分布时滞神经网络的稳定性分析

研究了一类含有分布时滞的神经网络的渐近稳定性问题.利用线性矩阵不等式(LMI)方法,并且引入适当的自由权矩阵,得到了一个新的时滞依赖的稳定性判据,所得判据是以线性矩阵不等式的形式给出,便于直接应用.最后给出的数值例子说明了所得结论的有效性和优越性.     

高阶时滞神经网络模型的全局指数稳定性

对具有时滞的二阶Hopfield型神经网络平衡点的全局渐近稳定性问题进行了研究.在不要求连接权矩阵的对称性和输入输出函数的可微性与单调性,只要求系统的参数满足是一个M矩阵的情况下,利用推广的Hanalay不等式和上右导数导得系统全局指数稳定性的若干充分条件.为二阶时滞神经网络稳定性的新方法、新结论.     

常时滞细胞神经网络稳定性分析

该文研究了一类常时滞细胞神经网络的稳定性.构造Lyapunov-Krasovskii函数和线性矩阵不等式(LMI)对此类问题进行了探讨,并得出稳定性判据.所得判据提供了一些参数来适当地弥补了反馈矩阵与时滞反馈矩阵之间的平衡关系.而且所得的判据与时滞无关,推广了以前文献中出现的结果且具有更少的限制.数值仿真说明了该文所介绍的方法的有效性.     

线性中立型时滞系统的新指数稳定法则

为研究线性中立型时滞系统的指数稳定性问题,构造一个新型的Lyapunov-Krasovskii泛函,基于线性矩阵不等式方法,给出指数稳定的时滞相关的充分条件.数值算例表明所得结论较某些已存在的结果提高了所允许的延时上界.     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

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.     

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.     

Design and analysis of generic LBS application developing platform

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

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.     

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。     

A computer generator for randomly layered structures

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

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

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.     

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.