子种群个体动态调整的人工蜂群算法

针对基本人工蜂群算法存在局部搜索能力差、收敛速度慢等缺点,提出一种动态调整子种群个体数目的改进人工蜂群算法用于求解无约束优化问题.该算法利用反向学习策略产生初始种群,以保证个体尽可能均匀分布在搜索空间中;基于个体适应度值,将种群分为两个子种群,分别采取不同的蜜源搜索公式,用于进行全局搜索和局部搜索.5个标准测试函数的仿真实验结果表明,改进算法具有较好的寻优性能.     

变异率和种群数目自适应的遗传算法

提出了针对个体变异率和种群数目的2种自适应方法.算法中个体变异率根据其适度值在种群中的排序自适应调整,使优良个体具有较小的变异率继续进化,而使种群中较差个体具有较大变异率,增强了种群搜索能力.同时根据种群个体适度值方差动态调整变异率曲线,种群数目调整则根据最优个体更新率动态增大,以动态适应解空间的规模避免采样误差造成的进化停滞.通过在不同尺度的NK Landscape上与传统的简单遗传算法(SGA)比较可得,2种自适应方法的引入对遗传算法的寻优能力有了明显改进.     

基于多种群的自适应差分进化算法

在分析了经典和改进变异操作算子的属性以及种群统计信息的基础上,按照个体适应度的差异,将个体分成不同的子种群并针对不同的个体适应度值,采用不同的变异算子,以保证在加快算法收敛速度的同时有效地跳出局部极值点.在参考经验值的基础上,加以自适应调整,使算法达到全局搜索能力与局部搜索能力的平衡.针对13个标准测试函数的仿真实验结果表明,所提出的算法与其他算法相比较具有较好的效果.     

多峰值函数优化的改进克隆选择算法

通过分析Castro提出的CLONALG算法在优化多峰值函数时存在峰值搜索能力弱、最优解易退化、收敛效率低等问题的根源,提出了一种基于记忆库小生境自适应克隆选择算法（MNACSA）。该算法首先采用小生境机制将种群分成若干类、分别从每个类中选出最优个体组成新种群;其次建立记忆库和自适应的高频变异率、且在库中引入最佳抗体抑制操作。对算法进行了分析和仿真实验,证明了该算法可以防止优秀个体退化、自动调节种群个体数目、提高优化效率、增强多峰搜索能力。     

一种基于自适应搜索的多模态多目标优化算法

为了解决目前基于分解的多模态多目标优化算法存在种群搜索能力不足，子种群中存在无用解和距离度量不具有普适性等问题，提出了一种基于自适应搜索的多模态多目标优化算法MOEA/D-AS.首先，该方法通过减少平均子种群的个体数量，进而增加参考向量的数量.其次，根据子种群当前状态自适应分配子种群的个体数量.最后，使用引入了局部种群信息的清除距离作为维护子种群的依据.将提出的算法与4种算法在2019年CEC多模态多目标测试问题和大规模多模态多目标测试问题上进行对比实验，实验结果表明，提出的算法可以有效解决多模态多目标优化问题.     

基于自适应搜索的免疫粒子群算法

经典粒子群算法由于多样性差而陷入局部最优,从而造成早熟停滞现象.为克服上述缺点,本文结合人工免疫算法,提出一种基于自适应搜索的免疫粒子群算法.首先,该算法改善了浓度机制;然后由粒子最大浓度值来控制子种群数目以充分利用粒子种群资源;最后对劣质子种群进行疫苗接种,利用粒子最大浓度值调节接种疫苗的搜索范围,不仅避免了种群退化现象,而且提高了算法的收敛精度和全局搜索能力.仿真结果表明该算法求解复杂函数优化问题的有效性和优越性.     

多种群并行的自适应差分进化算法

为了提高搜索速度,同时克服传统算法过早陷入局部最优值的不足,提出了一种改进自适应差分进化算法.改进算法在充分分析经典和改进变异操作算子的属性以及种群统计信息的基础上,按照个体适应度的差异,将个体分成不同的子种群并相应地引入与之匹配的变异算子,转换成一个多种群并行的优化问题,保证在加快算法收敛速度的同时有效跳出局部极值点...     

多策略自适应共生生物搜索算法

针对共生生物搜索算法搜索速度慢、收敛精度不高且易早熟的缺点,提出了一种多策略自适应改进算法。首先,根据适应度将种群分为3个群体,每个群体采用不同的搜索策略以实现不同功能。其次,提出了一种基于实时信息反馈的的混合搜索策略,使其搜索策略实现自适应调整。最后,对超边界个体进行变异操作,以增加种群多样性。对14个标准测试函数的仿真测试表明改进算法全局优化能力更强,具有更好的搜索速度和收敛精度。     

基于子种群的改进人工蜂群算法

针对人工蜂群算法以及现有改进算法的不足,提出了一种基于子种群的改进人工蜂群算法.此算法利用个体适应值与种群适应值平均值的比较,将种群划分为两个子种群,每个子种群采用不同的搜索方式,有效地平衡了不同搜索方式的探索和开发能力.此外,采用分段Logistic方程的初始化方法产生初始解,提高算法的收敛速度.与基本蜂群算法和其他改进蜂群算法进行比较,数值仿真结果表明,所提算法在处理复杂数值优化问题时具有更好的寻优精度和收敛速度.     

基于序列挖掘的分等级搜索可持续进化算法

讨论了最大频繁序列模式和公平竞争层次模型(HFC),设计了最大频繁序列模式的挖掘算法(MFSPMA),把MFSPMA同HFC结合起来,提出了基于序列挖掘技术的分等级搜索可持续进化算法(SEAHSM).该进化算法设置多个不同层次的种群为不同适应度水平的个体提供生存空间,采用最大频繁子模式挖掘算法挖掘种群中的优良基因,并将具有优良基因模块的新个体注入到不同适应度水平的种群,从而实现遗传信息的稳定继承,有效避免优良基因的丢失.实验结果表明:SEAHSM在维持遗传信息稳定性、避免早熟收敛、提高搜索精度等方面表现良好.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.