装配型的生产存贮网络

本文考虑了无生产约束的确定型的装配型生产存贮网络,证明了问题可化为r-网络上的最小费用流问题,由此导出了一个动态规划算法,且证明了在特定的条件下,存在一个最优解具有套入结构。     

基于带回溯传播信息和编码技术的求解传递闭包方法

求解传递闭包问题是计算机科学中的一经典问题.文章提出了一种新的传递闭包算法,并导出了若干理论结果,能够将任一关系图化为左偏序图,它是基于带回溯传播信息和编码技术的深度优先搜索算法,该算法效率高,且易于实现.     

一类四元数矩阵方程的最小二乘解

利用广义自反矩阵和广义反自反矩阵的性质讨论了线性方程组AX=b和矩阵方程AX=B的最小二乘解问题.当A为广义自反矩阵或广义反自反矩阵时,可将线性方程组AX=b的最小二乘解问题化为两个较小独立的子问题;当A、B都是广义自反矩阵或广义反自反矩阵时,可将矩阵方程AX=B的最小二乘解问题化为线性方程组的最小二乘解问题,从而使这些问题的讨论得到简化.     

反特征值问题的最小二乘解的Cramer法则

利用拉直算子将反特征值问题最小二乘解化为线性方程组极小范数最小二乘解,给出反特征值问题最小二乘解的Cramer法则。     

等参数图的最大与最小距离树对及其在电网络分析中的应用

本文推广了线图的树对及其距离的概念,提出了等参数图及其树对和树对之距离的概念。给出了等参数图中任一树对为一最大(或最小)距离树对的充分必要条件和相应的算法,讨论了等参数图中最大与最小距离树对在电网络分析中的应用,给出了网络图主划分算法1的对偶算法和电网络的最优调和分解算法。     

谈网络的固有频率与网络函数的关系

现行的电路教材在分析网络函数的性质时都要提及网络的固有频率,但对网络函数与网络的固有频率之间的关系未作详细的讨论。本文试图对这个问题作一点深入的分析. 一、网络变量的固有频率与网络的固有频率 网络变量是指网络中任一支路的电压或电流。对于一线性动态网络,其任一变量r(t)的     

Ad hoc网络中基于网络编码的可靠组播

为了最小化发送节点重传的总次数,对无线Ad hoc网络中基于网络编码的可靠组播技术进行了研究．根据从接收节点得到的反馈信息,提出了一个图模型来刻画基于网络编码的重传问题,并将发送节点的重传策略模型化为图中的最小团划分．针对不同丢包率的无线Ad hoc网络,比较了基于网络编码的重传策略和传统重传策略所需的重传次数．模拟实验结果表明,基于网络编码的重传策略需要的重传次数明显少于传统的重传策略．     

基于竞争的联想存储器学习算法

提出两种基于竞争的神经网络联想存储器学习算法—CC算法和ACC算法 ,并证明算法得到的神经网络对任一输入模式的竞争收敛性 ,由CC算法得到的网络 ,利用 p n个神经元存储p个n维样本模式 ;每个样本点都是吸引中心 ,不存在假吸引中心 ;对任一输入模式 ,总被吸引到与之海明距离最小的样本点上 ;不产生拒识点 .ACC算法是CC算法的改进形式 ,所得网络可在自适应学习中收敛 ,竞争次数较CC算法大大降低 本文算法得到的网络在存储容量、容错能力方面好于Hopfield联想存储器及作为联想存储器使用的BP网络 .     

基于竞争的联想存储器学习算法

提出两种基于竞争的神经网络联想存储器学习算法－ＣＣ算法和ＡＣＣ算法,并证明算法得到的神经网络对任一输入模式的竞争收敛性,由ＣＣ算法得到的网络,利用ｐ＋ｎ个神经元存储ｐ个ｎ维样本模式;每个样本点都是吸引中心,不存在假吸引中心;对任一输入模式,总被吸引到与之海明距离最小的样本点上;不产生拒识点。     

露天矿汽车运输系统网络描述方法

本文建立了露天矿汽车运输系统的基本网络模型;实现了采场任一采掘位置与运输系统基本网络的联接;合理地解决了露天矿复杂的汽车运输系统汽车运输问题;并对网络计算程序和数据输入方法进行了介绍.     

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.