模块化设计及其在齿轮减速器中的应用

齿轮减速器在现代机械中应用极为广泛，但传统的设计方法已不能满足工业技术迅速发展的需要．分析了传统的齿轮减速器设计方法的不足，介绍了模块化设计理论及其主要特点，讲述了模块化设计在齿轮减速器中的应用．运用模块化设计不仅能使齿轮减速器具有很大适应性和灵活性，同时对提高齿轮减速器的传动质量，延长使用寿命都具有重要意义。     

中小型提升机构减速器的选择与应用

文章介绍了中小型提升机构减速器的类型及其性能特点，同时介绍了摆线针轮减速器的技术规格、性能特点与选择。设计方法。     

Mathcad在齿轮参数优化设计中的应用

介绍了利用Mathcad软件进行齿轮减速器齿轮参数优化设计的一种新方法，该法相对传统齿轮参数设计方法而言，具有操作简单、运行效率高的特点，应用该方法对二级齿轮减速器齿轮参数进行了优化设计，结果表明，优化后的齿轮减速器总中心距比用传统方法设计的有明显减少。     

减速器参数化特征设计与虚拟装配研究

通过对减速器参数化特征造型设计过程的分析，建立了基于特征的产品信息模型，研究了以参数化特征造型技术构建产品特征的方法，介绍了在Pro/Engineer环境下实现减速器参数化特征设计的方法和步骤。     

回归式减速器的最佳尺寸选择

本文介绍了为新型轻便型灰浆搅拌机配套的回归式齿轮减速器的优化设计。设计结果表明，经优化设计的减速器尺寸有明显的减小，文章还给出了几个主要设计变量与整体尺寸关系的分析，可供设计时参考。     

外波式活齿减速器的研究

本文介绍一种新型结构的外波式活齿减速器的转动原理和主要参数的综合。外波式活齿减速器除具备活齿减速器的共同优点之外,同时又有一些独自的特点。为普及和推广活齿减速器的应用创造了良好条件。     

回归式减速器的最佳尺寸选择

本文介绍了为新型轻便型灰浆搅拌机配套的回归式齿轮减速器的优化设计．设计结果表明，经优化设计的减速器尺寸有明显的减小．文章还给出了几个主要设计变量与整体尺寸关系的分析，可供设计时参考     

驱动桥主减速器总成磨合试验台设计

主减速器总成是驱动桥上重要的零部件之一，其作用是将万向传动装置传来的动力折过90°角，改变力的传递方向，并由主减器降低转速，增大转矩后，经差速器分配给左右半轴和驱动轮。为何证驱动桥总成装配质量，需要通过主减总成磨合试验台对主减速器总成进行磨合试验，检查主被齿啮合印迹及齿响是否体例技术要求。本文对驱动桥主减速器总成磨合试验台设计进行了简单介绍。     

ZHLR-170K齿轮减速器事故分析与处理

介绍了ZHLR-170K齿轮减速器的结构和特点,分析了齿轮失效的原因并提出了具体的解决方法,总结了使用减速器的注意事项。     

游梁式抽油机减速器平均效率的测量

游梁式抽油机减速器的平均效率是分析抽油机动态性能的重要工作参数，用常规方法很难对减速器输出轴转矩瞬时值进行连续测量，所得到的只是平均转矩，其测试结果也有误差．本文介绍了用ＮＥＣ公司生产的ＮＫ－７６９０遥测仪同步测试电机、抽油机曲柄轴转矩，用测速电机测电机转速的方案，最后算出一冲程内电机及减速器输出轴功率，再用积分法算出二者在一冲程内的功则可算出减速器的平均效率．本文提供对２种工况的测试结果     

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.     

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.     

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。     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with