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1.
提出一种具有认判别功能的自联想记忆神经网络模型,对一个新的输入模式,当网络达到平衡点时,通过一种差别函数可差别该模式是否是网络中已存贮的模式,如不是则对其进行学习;如是则该平衡状态即为其联想结果,给出了模型及其学习规则,分析了网络吸引子半径与有关参数的关系及模型对输入模式的筛选作用,最后给出了计算结果。  相似文献   

2.
采用数值模拟对复合地基附加应力的扩散模式进行了研究,对规范及相关文献给出的地基沉降计算方法进行了讨论,分析了承载板刚度、载荷大小、桩体刚度对应力扩散模式及扩散角的影响,在规范给出的地基沉降计算方法的基础上,考虑复合地基附加应力的实际扩散模式,提出了一种新的复合地基沉降计算模式,并给出了应力扩散角的取值建议.通过与实测数据的对比,证明该方法比其他方法计算结果更加准确.  相似文献   

3.
本文根据恩格斯辩证唯物主义自然观的基本思想,结合当代自然科学的发展,提出了现代自然哲学研究对象的无限性观点,给出了现代自然哲学的一组准公理化命题,并运用泛系方法论的原理、模式和方法对这些命题进行了新的分析。本文对于传统自然哲学中的一些合理内容、辩证自然观与系统自然观的基本观点给出了新的、相对统一的处理,并阐述了一些新的观点与模式。  相似文献   

4.
对一类新的包含两个不同非线性算子的一般变分不等式组进行了研究;利用投影技巧,给出了一个求解这种一般变分不等式组的显式两步迭代算法;证明了该算法在适当的条件下收敛;所得的结果改进了该领域内的一些最新结果.  相似文献   

5.
钢筋混凝土连续弯箱梁桥的温度梯度   总被引:8,自引:0,他引:8  
介绍了国内外6种温度梯度模式,结合某实际工程,对钢筋混凝土连续弯箱梁桥的温度梯度和温度荷栽下的主梁控制断面的位移值进行了连续观测。通过对实测数据的分析,提出了公路大悬臂曲线箱梁桥的温度梯度模式;按照7种温度梯度模式,利用有限元软件ANSYS计算了某匝道桥控制断面的位移值。计算结果表明:按中国公路桥梁规范(1985)提出的T梁温度分布模式来计算箱梁位移偏不安全;中国新的桥梁规范和美国规范类似,计算结果和实测值相比偏大;给出的温度梯度模式计算结果与实测的变形值比较接近;由于公路大悬臂曲线箱梁桥的构造具有特殊性,因此不宜套用铁路桥梁规范或其他温度梯度模式。  相似文献   

6.
并口EPP模式下的双机高速互连   总被引:1,自引:0,他引:1  
分析了利用并行口进行双机互连的传统方法的缺点,提出了利用增强并行口进行双机互连的方法;介绍了并行口EPP模式的协议,给出在并口EPP模式下进行双机高速互连的电缆连接方法和软件编程的要点;将本方法和其它各种双机互连方法进行了对比并给出结论.  相似文献   

7.
一种从Web日志中挖掘访问模式的新算法   总被引:5,自引:0,他引:5  
提出了一种用于从Web日志中高效挖掘Web访问模式的新算法.设计了一个新的数据结构WAS树(Web Access Sequence树)来记录Web访问序列和它的计数,避免冗长的支持度计算;开发出一个高效的递归算法,从WAS树中枚举出所有的访问模式,最后对算法的性能进行了分析并给出试验数据加以佐证.这个算法的特点是不需要产生候选模式而直接挖掘出所有的访问模式。  相似文献   

8.
复杂高效用模式挖掘是当前研究的一个新兴主题。本文首次从高效用融合模式和衍生模式2个角度进行讨论。首先,对于融合模式,根据数据结构的不同对高效用序列模式进行分类论述;按照时间顺序对高效用片段模式、周期高效用模式进行概述。针对衍生模式,从数据结构角度对高平均效用模式、带有负项的高效用模式、on-shelf高效用模式进行总结;从精简类型角度概述精简高效用模式,并对现有融合模式和衍生模式挖掘算法的优缺点、上边界等进行对比分析。最后,针对现阶段研究缺陷与不足,给出了下一步研究方向,包括不确定数据中的高效用模式挖掘方法、数据流上的高效用on-shelf模式挖掘方法和大数据环境下的并行高效用模式挖掘方法。  相似文献   

9.
在VB中对并行口编程   总被引:2,自引:1,他引:2  
介绍了并行口的基本内容;对DLL文件在VB中的使用方法进行了说明;介绍了在VB中检测并口是否存在和测试并口工作模式的一般方法,给出主要的测试程序;对VB中输入输出的编程方法进行了阐述并给出数据传输流程图和典型的过程与函数.  相似文献   

10.
针对先进制造模式应用实施过程中的外部影响,从控制模型的视角研究了先进制造模式扩散中外部影响的建模与分析.首先,分析了先进制造模式扩散的外部影响因素,结合先进制造模式扩散的动力学模型,建立了扩散的控制模型;其次,对扩散控制模型的稳定性、能控性及能观性进行分析,给出定性分析的结果;再次,利用极点配置设计了反馈控制器;最后,针对具体的先进制造模式扩散过程,采用Matlab7.1对控制模型进行了仿真,仿真结果与定性分析结果相一致,验证了模型的正确性.  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.
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   

15.
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   

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

19.
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   

20.
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   

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