四杆机构九精确点轨迹综合的延拓法

平面四杆机构连杆上某点精确通过预定九个点位的轨迹综合问题是长期以来难以精确求解的课题，至今，多以近似求解法求解，本文将以求解多项式方程组的延拓法求解基于标准型方程而导出的高次多项式方程组，详细介绍了延拓法及其计算机算法，该方法的特点是能可靠地得到方程给的全总部数学解系，但计算量大，本文最后给出了九精确占轨迹综合实例及其计算结果，经计算机动画模拟演示，说明计算结果是正确的。     

四杆机构九精确点轨迹综合的延拓法

平面四杆机构连杆上某点精确通过预定九个点位的轨迹综合问题是长期以来难以精确求解的课题，至今，多以近似求解法求解．本文将以求解多项式方程组的延拓法求解基于标准型方程而导出的高次多项式方程组，详细介绍了延拓法及其计算机算法，该方法的特点是能可靠地得到方程给的全部数学解系，但计算量大，本文最后给出了九精确点轨迹综合实例及其计算结果，经计算机动画模拟演示，说明计算结果是正确的．     

平面四杆机构轨迹综合的延拓法

本文采用一种全新的非线性方程组求解方法—“延拓法”对平面四杆机构轨迹精确点综合问题进行了深入的研究，首先简要阐述了延拓法，以复数法和标准双失组建立了四杆机构五精确点轨迹综合方程，导出了延拓法可解的多项式方程组，详细论述了方程组的求解过程并给出了实例及其部分计算结果．     

平在四杆机构轨迹综合的延拓法

本文采用一种全新的非线性方程组求解方法－－“延拓法”对平面罩 村机构轨迹精确点综合问题进行了深入的研究，首先简要阐述了延拓法，以复数法和标准双失组建立了四杆机构五精确点轨迹综合方程，导出了延拓法可解的多项式方程组，详细论述了方程组的求解过程并给出了实例及其部分计算结果。     

二冲程内燃机扫气流场的数值模拟

用分块结构化网格对二冲程内燃机的扫气流场进行了三维数值模拟，在缺内代数方法生成贴体网格，用ＡＬＥ法求解控制方程组，提高了离心力源项的计算精度。通过在一个两气口气缸模型上进行的大量数值实验，探讨了数值计算中出现的问题及解决方法，模拟了两种二冲程发动机的扫气过程，其结果与实验对比是令人满意的。     

孔型设计的拟Newton迭代算法

本文提出一种通过求解非线性方程组设计孔型尺寸的方法。文中以菱一方和椭－方孔型系统为例，给出了相应的非线性方程组及采用拟Ｎｅｗｔｏｎ法求解的方法和步骤；根据实际计算结果，讨论了延伸系数的取值范围。     

焊接熔池浮力－表面张力驱动流数值解的源项与边值处理

从固／液相变问题的单相统一模型控制方程组出发，用焓法‘模糊，处理固／液运动界面和相变潜热，用Ｔａｙｌｏｒ级数展开法处理非线性源项，并将附加源项法扩展应用于处理动量方程的表面张力边界条件，使整个控制方程组的迭代求解局限于内节点上，从而加快了方程组耦合求解的收敛速度，二维轴对称定点熔化焊浮力－表面张力联合驱动流的数值计算结果表明，这种源项与边值的处理方法较非线性源项的显式处理和热边界条件的附加源项处理计算速度提高１５％～２０％，且计算结果相当一致。     

MLPG法与配点法耦合求解地下水非均质承压稳定流问题

给出了无网格局部Petrov-Galerkin(MLPG)法与配点法耦合求解导水系数为分片常数的非均质承压稳定流问题的方法.在各子区分界线布置的节点上,应用相容条件建立配点方程组,在除分界线外的其他节点上建立MLPG方程组,联立得到求解水头函数数值解的耦合方程组.编写了相应MATLAB程序,进行了具体模型计算,并与MLPG法和边界元法的计算结果进行了比较,结果表明该方法求解问题有效,精度较MLPG法计算精度显著提高,且明显优于边界元法.     

离散卷积方程组的反卷积解法

对于离散卷积方程组,一般采用傅氏变换的方法求解,但在某些特定系统的情况下,零频率丢失。如在空间域用直接反卷积法求解,将解决这一问题,首先分析了离散卷积和离散反卷积的计算方法,对用高斯消去法和求逆法求解离散卷积方程组作了说明,最后对直接反卷积求解的计算量进行了估计。     

连续法研究进展及其应用

非线性问题在许多应用学科中存在，由于其难以求解而限制了诸学科的发展，因此寻求一种有效的非线性方程求解方法具有重要意义。介绍了在复数域内求多项式方程组全部解的连续法和在实数域内求任意非线性方程组多组实数解的实数连续法，讨论了两种方法的应用情况，通过实例比较了两种方法的计算效率，为工程中非线性问题的求解提供了有效的途径。     

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.