在机械制图课教学中贯彻能力本位教育理念

学好《机械制图》对于促进其他专业基础课程及生产实习课的有效学习至关重要。《机械制图》的教学目标应该是培养学生的读图能力、绘图能力、空间想象和创新能力。     

3D打印技术在机械制图课程中的教学改革探索

机械制图是一门具有很强实践性的机械工程专业基础课程,对空间想象和逻辑思维能力都有着较高的要求,但由于教学内容守旧单一、教学手段不够丰富等问题,教学质量往往差强人意。通过认识机械制图课程的教学目标、特点以及现存问题,提出将3D打印技术融入机械制图课堂教学过程中,并给出了具体实施方案,实现3D打印与机械制图的有机结合,激发学生学习兴趣与积极性,提高机械制图课程的教学效果和人才培养质量。     

浅谈《机械制图》教学心得

机械制图课程是一门培养学生空间思维和设计创造能力的专业基础课程。教师在机械制图的教学过程中,要注重贯彻制图的国家标准,精心设计和安排知识点,灵活采用多种教学方法,加强学生技能训练,激发学生的学习兴趣,培养学生空间想象力和动手能力。     

浅谈《机械制图》课的教学过程

《机械制图》是机电专业一门既有理论,又有实践的重要技术基础课,让学生真正弄懂和掌握《机械制图》的基本理论、基本知识和基本方法,具备一定的识图、绘图和空间想象能力,对于学生进一步学习本专业的其他专业课,关系极大。面对学生整体水平下降并且个性差异大,怎样根据不同的教学内容和多样的学生实际选用恰当的教学方法,是决定教学效果好坏的重要因素。     

浅谈高职高专机械制图课教学如何适应专业培养目标的要求

机械制图课程是高职高专院校机械类专业重要的技术基础课,对学生的空间想象能力和在复杂立体与平面图形间进行相互转化的能力要求较高。文章从教学内容、能力培养、教学方法等方面论述了高职机械制图课应如何适应专业培养目标。     

《机械制图》空间思维能力的培养

《机械制图》是高等院校机械、数控、模具、材料等专业的专业基础课,该课程的教学质量高低直接影响着学生的专业素质,而专业素质由学生的空间想象能力和综合制图能力的高低来衡量。机械制图分为画法几何和工程制图两大部分。画法几何是制图的理论基础,抽象思维较多,而工程制图主要是应用形象思维。然而,抽象思维对于没有接受过相应专业训练的学生来说是相对困难和枯燥的。所以教师在教学过程中应尽可能采用多种方式调动学生的学习兴趣,启发丰富的想象能力,培养严密的思维结构,锻炼严谨的制图风格。演示模具与多媒体技术是教学《机械制图》的硬条件,而课前预习、课堂上教学互动及课后多做练习、多思考是学好该课程的软条件。     

关于中职学校机械制图课堂教学有效性的思考

《机械制图》是中等职业学校机械类及工程技术类相关专业的一门重要的基础课程。是培养学生动手能力的重要课程之一,其主要任务就是培养学生绘制以及识读工程图样的基本能力。本文在对中等职业学校课堂教学的现状进行分析的基础上得出结论：充分预设、激发兴趣、师生合作、合理评价、积极反思,是提高《机械制图》课堂教学有效性的最佳方案。     

制图作业的优化选择

《机械制图》是一门实践性很强的技术基础课,主要培养学生的识图、绘图能力和空间想象力。学习中要求学生必须有占课程总数60％的时间独立完成作业,即在“画”中求“学”,学生高质量地完成作业是提高学习质量的关键,而教师在教学过程中抓住这一关键的前提是作业的优化选择,使学生经过自己的刻苦钻研来掌握学习内容。经过多年的教学实践,我们总结出制图作业的几条优化选择原则。     

走出学习《机械制图》课程的心理困惑

《机械制图》是机械类专业的专业基础课程,是学好本专业其他课程的基础,可学生在学习中存在不少困惑。本文通过分析列举了学生在学习《机械制图》中存在的主要心理困惑,并分析心理困惑产生的原因及提出心理疏导的方法,帮助广大学生解决学习中的难题。     

利用CAXA实体设计软件提高中职《机械制图》教学效果

机械制图是工程技术人员必备的基本功，是机电工程专业一门重要的专业基础课。由于中职学生没有平面几何和立体几何的学习基础，再加上中职学生本身的能力不够，机械制图对中职机电工程专业的中职学生来说一直都是一门较为困难的课程，为了帮助学生克服机械制图的学习困难，我们利用CAXA实体设计软件与机械制图进行了有机地整合，并进行对比实验，对实验数据进行了数据分析，并试图从理论上对实验结果进行了分析。     

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