提升机卷筒的有限元法分析

本文利用有限单元法计算提升机卷筒各点的应力及变形。利用修改刚度矩阵及载荷列阵的方法较为精确地解决了在单层以及多层缠绕下的钢绳拉力降低的计算问题。文中对卷筒凸缘的载荷作了近似分析。提出了计算多层缠绕钢绳的提升机卷筒的程序(从略备查)。     

缠绕式提升机圆板支轮位置对筒壳应力的影响

通过对缠绕式提升机圆板支轮筒壳应力的分析，得出支轮处弯矩不一定是支轮区的最大弯矩；指出了支轮位置的选择范围．按此范围设计的卷筒，使用效果良好．     

双简缠绕式提升机卷筒应力分析研究

分析了双筒缠绕式提升机卷筒的受力情况,并对自由筒壳区的强度、支轮强度以及筒壳稳定性计算作了详细介绍,对今后有针对性地设计合理的卷筒结构,减轻卷筒质量,节省材料有着重要的意义,完善了卷筒强度的设计方法。     

双筒缠绕式提升机卷筒应力分析研究

分析了双筒缠绕式提升机卷筒的受力情况,并对自由筒壳区的强度、支轮强度以及筒壳稳定性计算作了详细介绍,对今后有针对性地设计合理的卷筒结构,减轻卷筒质量,节省材料有着重要的意义,完善了卷筒强度的设计方法.     

木衬对提升机筒壳强度影响的有限元分析

针对矿用提升机卷筒容易开裂、塌陷、开焊或连接螺钉剪断等现象,应用大型有限元分析软件 ANSYS 对提升机筒壳进行了线性分析。为了节省计算机资源,简化了提升机筒壳的力学模型;考虑在静力状态下,建立了有限元分析模型;计算筒壳应力分布及强度大小,并对其结果进行分析,从而得出木衬对提升机卷筒的影响,为提升机生产厂家和用户提出了建议。     

矿井提升机主轴的应力应变分析

利用SolidWorks软件建立了双卷筒缠绕式提升机主轴的三维模型,利用ANSYS软件对其在六种工况下进行静力学分析。实现了主轴静强度和静刚度的校核,得到了主轴的应力应变分布规律,为双卷筒缠绕式提升机主轴结构的改进设计、寿命计算等提供了依据。     

缠绕式提升机主轴装置的优化设计

采用弹性基础梁理论对弹性圃板支撑下的卷筒结构和应力进行了分析和研究，进而利用现代离散优化设计方法对矿用双筒缠绕式提升机主轴装置的结构参数进行了优化设计，这对改进提升机的设计方法，提高我国提升机的设计水平具有一定的理论和实用价值。     

新庄煤矿主井提升机卷筒开裂的原因及处理方法

本文主要分析了主井提升机的卷筒开裂的原因,通过消除交变应力和改变修补工艺的方法,对滚筒进行加固,成功地延长了提升机的使用寿命,保证了提升机安全运行。     

结构变化对多绳摩擦式提升机主导轮应力的影响

为了解决JKM型多绳摩擦式提升机主导轮开裂开焊问题,获得更合理的主导轮结构,应用Pro/E和有限元分析软件对JKM-3.25/4型多绳摩擦式提升机主导轮进行了有限元分析,对主导轮原结构和加焊筋板后结构进行应力分布测试,给出支轮与卷筒间径向夹角对主导轮影响的应力曲线,对结构改造前后动态参数进行验证。结果表明:主导轮内两轮毂间的槽钢及筋板对主导轮的整体应力状态影响不大,但对焊缝处的应力产生影响。当支轮与筒壳间的径向夹角大于5°时,会恶化主导轮的整体受力情况;当夹角取5°时,支轮与卷筒间焊缝的应力及应力波动幅度最小,能够改善主导轮工作应力状况,利于提高主导轮的使用寿命。     

衬垫对缠绕式提升机卷筒的影响

本文应用有限单元方法计算和分析了钢丝绳和垫衬对缠绕提升机卷筒的作用程度。并就木质衬垫和MC尼龙(铸型尼龙)衬垫进行了比较,探讨了MC尼龙衬垫用于大直径卷筒的可能性。     

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.