一种含有磁控忆阻器的四阶混沌电路的特征分析

该文提出了一种简单的磁控忆阻器模型,并利用它设计了一个混沌电路。通过数值模拟计算得到了一个三维带状混沌吸引子,且此时忆阻器的伏安特性曲线不是传统的"8"字形。通过计算系统的相图、分岔图和Lyapunov指数谱,发现调节电容参数或忆阻器初始状态可以实现电路系统在混沌态和各周期态之间的转变,发现调节磁通能使系统出现二周期到四周期再回到二周期的奇特分岔现象。该研究工作对利用忆阻器设计混沌电路并应用于密码通信具有积极的参考价值。     

含忆阻器的并联混沌电路动力学分析

忆阻器在保密通信、图像加密中具有重要应用价值。本文提出一种有源压控忆阻器,将该忆阻器和电容、电感并联构成了一个基于忆阻器的并联混沌电路,建立了该系统的无量纲数学模型。采用基本动力学分析方法对系统进行分析,计算了该电路的Lyapunov指数和Lyapunov维数,通过数值仿真得出该系统的相轨图和Poincaré映射,分析了系统的平衡点稳定性,采用Lyapunov指数谱和分岔图等分析方法,研究了电路参数改变对系统动力学行为产生的影响。数值仿真和理论分析结果表明,该系统可以产生一类特殊的超混沌吸引子,并且随着电路参数的变化产生复杂的非线性动力学行为。     

基于改进忆阻器的混沌电路研究

忆阻器是一种具有记忆和连续输出特点的非线性电阻器,针对窗函数忆阻器模型的不足,提出了一种改进的窗函数,它通过添加一个参数来关联忆阻器的线性与非线性特性。为了对该窗函数进行验证,运用了数值分析与模拟电路分析的方法,仿真得出了忆阻器的伏安特性曲线,结果表明,使用改进窗函数的忆阻器模型更加接近实际物理状态。同时,为了进一步研究该模型的电路特性,将该模型应用于蔡氏混沌电路,通过MATLAB仿真得出其相图,并分析它的李雅普诺夫指数谱,数据表明该电路能产生混沌现象,因此,该忆阻器模型是一个能被应用的非线性模型。     

忆阻蔡氏对偶混沌电路分析

提出了用分段单调荷控忆阻器代替对偶蔡氏混沌电路中的非线性电阻,构造出基于忆阻器的对偶蔡氏混沌电路。对该忆阻蔡氏对偶混沌电路的理论推导、稳定性、Lyapunov 指数和数值仿真等动力学特性进行了分析。研究结果表明：该系统为双涡卷混沌吸引子,该忆阻蔡氏对偶混沌电路的动力学特征对初值敏感异于普通混沌电路。     

有源荷控忆阻器在非线性电路中的应用

根据理论分析,搭建了一种新的二端口有源忆阻器.该有源荷控忆阻器不使用光敏电阻和数字电位器,理论上比较精确,并且容易在实验中实现.仿真和实验证明了这种有源忆阻器和真正的无源忆阻器具有相同的电路特性.此外还将该有源忆阻器加入到蔡氏混沌电路中,在非线性电路中成功实现混沌现象,证明了它可以等效于一个二端口元件接入其它电路工作,为忆阻器的应用打下了基础.     

基于磁控忆阻器的混沌振荡器研究

本文提出了磁控忆阻器的一种等效电路,该电路和理论上的忆阻器具有相同的电路特性.此外,本文还使用该磁控忆阻器和一个负电导代替蔡氏混沌振荡器中的蔡氏二极管,并产生双涡卷混沌吸引子.仿真和实验验证了该方法的可行性.     

基于忆阻器的混沌电路设计与硬件实验

通过在经典QI混沌系统中加入三次非线性磁控忆阻器,构造出了一种四维忆阻混沌系统.分析了该系统的基本动力学特性,证明该系统可以产生混沌吸引子.设计了硬件电路,通过改变元件参数观察到不同类型的吸引子和极限环,实验结果与仿真结果相符合.提出的基于忆阻器的混沌电路设计与硬件实验方案不仅可以拓展传统混沌电路的实现方法,还为非线性...     

含磁控忆阻器阻尼特性电路的混沌特性分析

提出了一个基于忆阻器的五阶混沌电路,确立了电路模型,建立了相应的非线性微分方程组,并对系统进行了混沌动力学仿真分析。研究表明,忆阻器可明显影响本非线性电路的混沌特性。计算了系统的Lyapunov指数、功率谱等,获得了系统的时域图、相图、庞加莱截面及大量有价值的数据,验证了理论分析的正确性。     

降维的对偶忆阻混沌电路及其FPGA的实现

提出了一个对偶忆阻器混沌电路,对其降维研究的结果表明降维的对偶忆阻混沌电路与对偶蔡氏混沌电路一致.并利用FPGA实现了降维的忆阻混沌电路,说明此忆阻混沌电路可数字化实现.     

不连续时滞分数阶忆阻神经网络的非线性动力学分析

提出一个具有不连续忆导函数的时滞分数阶忆阻神经网络模型,通过数值仿真研究其复杂非线性动力学行为。首先提出了不连续分数阶忆阻神经网络的数学模型;其次,分别将初值、分数阶及开关阶跃作为分岔参数,通过分岔图、相图、庞加莱截面等数值分析手段验证了其典型的动力学行为。研究表明:不同于传统的倍周期分岔通向混沌的道路,该不连续忆阻神经网络通往混沌的道路为阵发混沌。另外,还揭示了不连续的忆导函数和开关阶跃对分数阶忆阻神经网络动力学行为的内在影响机制。     

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.     

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.     

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。     

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.