异结构混沌系统之间的非线性反馈同步

选取了在电路上易于实现的两个异结构三阶自治混沌系统,并对其进行了混沌特征分析.运用EWB软件设计了实现2个混沌系统的实验电路.分析表明,两系统拓扑不等价,但奇异吸引子结构具有一定相似性.提出了一种非线性反馈控制方法实现两系统之间的混沌同步.数值仿真结果证明了理论分析的正确性.     

超混沌耦合发电机系统与超混沌Liu系统的异结构反同步

研究了两个不同结构的超混沌系统的反同步问题。采用主动控制法和直接构造法分别设计出适当的非线性控函数,实现超混沌耦合发电机系统和超混沌Liu系统的异结构反同步。数值模拟结果验证了这两种实现异结构反同步方法的可行性和有效性。     

异结构超混沌系统的完全同步与反相同步控制

基于Lyapunov稳定性理论和非线性动力学理论,构造出相应的非线性控制器,实现了三维混沌系统与四维超混沌系统之间异结构完全同步与反相同步控制,并对上述2类同步给出了严格的数学证明。以一个新型三维自治系统为例,引入状态反馈变量,构造了一个新的超混沌系统,研究了不同维数混沌系统之间的异结构完全同步与反相同步问题。最后,借助于Runge-Kutta算法进行数值仿真,通过对误差系统的误差进行分析,得到驱动系统和响应系统状态变量误差能在短时间内快速趋于零,表明理论推导的正确性和所提出方案的有效性。     

非线性耦合分数阶系统的异结构同步

针对异结构的分数阶混沌系统同步问题,提出了非线性耦合分数阶异结构混沌系统的同步方法,即在α+β-1=0条件下,利用非线性耦合实现两个异结构分数阶混沌系统同步,并通过数值仿真证明了其有效性.仿真实验显示,随着耦合系数的变化,系统呈现多样性,分数阶混沌系统出现不同混沌状态,而分数阶超混沌系统不仅会出现超混沌状态,还会出现发散的现象.     

参数未知的超混沌系统的反同步与参数辨识

基于混沌同步的主动控制法,提出反对称结构的直接构造法,利用该方法设计了反同步控制器和参数追踪规则,构建了反同步控制器的电路实验,实现了参数未知的超混沌耦合发电机系统的反同步与未知参数的辨识。数值模拟和电路仿真结果证明了该方法的有效性。     

参数未知的统一混沌系统中的混合同步现象

研究了一种新的混合同步现象,在这种同步模式中,系统的一部分状态正相同步,而其他状态反相同步.主要研究了参数未知的统一混沌系统的混合同步问题,设计了一个简单的单向线性反馈控制器和一个针对未知参数的参数更新律,并基于Lyapunov稳定性理论,提出了一个实现混合同步的充分条件.对统一混沌系统中参数取两个不同值的数值仿真结果表明,所提方法能够实现正反相同步共存的混合同步方案.设计的同步控制方法适用于实现类似混沌系统或超混沌系统的混合同步,具有较强的实际应用价值.     

一种单涡旋混沌系统与Chen系统的同步控制

针对目前多数混沌同步研究只在同一系统或相似结构系统中进行的情况，应用驱动-响应控制方法，实现了一种单涡旋混沌系统与Chen系统的同步控制．利用Routh-Hurwitz判据，得出了系统同步时控制参数k小于-3．7371．采用软件Matlab6．5和EWB设计电路进行了数值仿真和实验验证，结果表明，驱动-响应控制法可以有效地实现异结构混沌系统的同步控制，并且控制参数越小，实现同步所需的时间越短．     

超混沌Chen系统的自适应同步与电路实验研究

研究了超混沌Chen系统的自适应同步问题,基于Lyapunov稳定性理论,设计了参数未知结构相同的2个超混沌Chen系统自适应同步控制器和同步控制器电路,该控制器结构简单,不需要知道系统参数,就可实施控制.数值仿真和电路实验仿真证实了该方法的有效性.     

驱动响应系统之间的广义同步与相同步

研究了驱动响应混沌系统之间的广义同步和相同步关系。借助辅助系统方法，通过计算系统的平均旋转数，分别研究了驱动响应混沌系统之间达到广义同步和相同步时，广义同步和相同步与耦合强度的关系。结果表明，随着耦合强度的增加，广义同步总是先于相同步发生，即系统间达到广义同步所需的耦合强度小于达到相同步所需的耦合强度，这说明了广义同步弱于相同步，相同步是广义同步的一种。     

一个具有双混沌吸引子的系统——Newton-Leipnik混沌系统的反同步

分析了Newton-Leipnik系统中获得双混沌吸引子--上、下吸引子时初始条件的取值范围. 基于Lyapunov稳定性理论和主动控制方法, 实现了该混沌系统的反同步. 通过选取适当的非线性控制器, 不仅实现了2个完全相同的Newton-Leipnik系统的自结构反同步,而且也实现了Newton-Leipnik系统和Lorenz系统、Chen系统、Sprott-O系统之间的异结构反同步.同时, 还获得了实现反同步参数所满足的条件. 最后,利用数学软件Mathematica进行了数值模拟,验证了以上方法的可行性与有效性.     

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.