环锭纺捻陷现象的研究及捻度损失的计算

本文研究环锭纺动态捻度传递过程，对导纱钩的捻陷作用及捻度损失的计算进行了分析探讨。同时，对用欧拉张力公式计算在摩擦表面上运动纱线的张力的方法进行了补充修正。     

加拈过程中欧拉公式的应用与修正

本文讨论纱线在加拈过程中兼有轴向及回转运动的情况下,当纱线绕圆柱面滑动时,对纱线两端张力的变化重新作了分析,得出此时应用的欧拉公式必须加以修正为:T_2/T_1=e~(kμθ).k为θ角接触弧段上纱线平均拈回角β的余弦,即k=cosβ。μ为摩擦系数。     

关于欧拉求和函数的微分及应用

针对文献[1]中的一些重要结论,在Hurwitz zeta函数部分和的积分渐进公式研究的基础上,研究了欧拉求和函数的推广的微分问题.采用解析数论中函数和级数的积分方法,对于Hurwitz zeta函数部分和进行微分,得出了欧拉求和函数推广公式的一阶和二阶微分公式,即定理1和定理2,将其结论进行应用,推出了关于级数和积分...     

粗纱在压掌曲臂面上滑动时张力的计算方法

本文对粗纱在压掌曲臂面上滑动时的张力进行了分析,按不同的简化方法,列出三种张力计算方法,并将张力计算值与模拟实验测得的数据作了分析比较,从中否定了欧拉公式及圆柱面上斜向滑动张力公式二种误差较大的计算法,肯定了较精确的简化圆环计算法.这对于纺纱生产中精纱张力的研究和锭翼压掌结构的设计有实际参考价值。     

基于光电鼠标传感器的纱线张力检测方法研究

本文提出了一种基于光电鼠标传感器的纱线张力检测方法,分析了纱线张力检测的原理,介绍了一种基于光电鼠标,单片机等器件组成的检测控制系统,能够在无接触条件下检测纱线的张力大小。     

地毯簇绒机纱线牵引和张力稳定方法

首先分析地毯簇绒机引纱过程中牵引罗拉与纱线的相互作用关系,提出牵引罗拉的引纱机理相当于多个小直径罗拉的非挤压式引纱.然后通过理论推导和作图解析,分析了地毯簇绒机的牵引罗拉在引纱过程中对纱线张力的稳定机理,在纱线张力均值按eμΦ倍减小的同时,张力波动的方差以e2μΦ倍减小,从而使牵引罗拉输出端纱线张力的波动大幅度减小.并提出可以通过调整两罗拉间隙来改变纱线与罗拉的总包围角,从而调整纱线张力.     

矩阵环的欧拉恒等式与标准多项式恒等式

Szigeti-Tuza和Revesz使用Swan图论定理构造了n×n矩阵环Mn（C）的欧拉恒等式[1].本文中证明这些恒等式可由标准多项式生成,即：若欧拉图Γp,q从某顶点t到u（t,u可为同一点）至少有n条边,则该欧拉图对应的欧拉多项式fΓp,q（X）可由标准多项式Sn（X）生成.该结果不仅推广了Chang[2]和Giambruno-Sehal[3]的结果,而且找到由欧拉恒等式生成的T-理想的一个有限生成集.     

拟欧拉公式的一点注记

研究了微分几何中的拟欧拉公式及其应用.首先给出它的一个新的证明,再由微分几何中的欧拉及拟欧拉公式,得到了一个新的拟欧拉公式,这一公式反映了两曲面沿交线的曲率与法曲率和测地曲率之间的关系.     

一种新型的纺纱张力自动控制系统的设计

纺纱过程中,卷绕性能的优劣直接影响到筒纱成形、纱线质量以及布机的生产效率和产品质量.设计了基于纱线张力检测的纱线张力自动控制系统,该系统利用特殊的机械装置结合测距离传感器来检测纱线张力,通过以56F805为内核的嵌入式系统,采用空间矢量调制(SVPWM),实现对电机转速的全数字化控制,以达到纱线卷绕张力恒定控制.该系统具有电压和电流保护、错误报警等功能,实现了卷绕过程自动化.具有纱线张力自动控制系统的卷绕装置,其结构简单、成本低、实时性好、控制精度高等特点,在实际应用获得良好效果.     

地毯簇绒装备的类齿轮特殊罗拉纱线牵引装置

与常规的挤压式、非挤压式罗拉纱线牵引装置作对比,介绍一种在地毯簇绒装备中使用的类齿轮特殊罗拉纱线牵引装置.进行这种特殊罗拉纱线牵引装置中的纱线力学理论研究,得出与实际情况吻合的罗拉纱线牵引性质：纱线所受张力与在罗拉啮合中所处位置的关系;两罗拉中心距变化与纱线所受张力的关系;罗拉齿外圆弧半径与纱线所受张力的关系;以及纱线所受摩擦力的性质.     

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.     

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.     

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.