井下抽油泵柱塞与泵筒运动规律的研究

用三元振动模型,综合考虑油柱、抽油杆柱和油管柱的振动.建立起数学模型并离散化,然后用微机编程求解微分方程组.对不同工况下的抽油泵运动规律和抽油机示功图进行分析研究,得出了油管应予锚定的结论,并给出了不同抽油机的适用范围.为进一步研究抽油泵的井下工作机理和故障原因打下了基础.     

基于常规相参雷达实现目标横向一维成像

本文利用ＩＳＡＲ技术对常规相参雷达实现目标横向一维成像问题进行了研究，着重提出了一种基于回波相位差进行相位拟合的运动补偿方法。与以往的方法相比，这种方法具有运算量小，适用范围广等优点。     

Cartesian causation: body–body interaction, motion, and eternal truths

There is considerable debate among scholars over whether Descartes allowed for genuine body–body interaction. I begin by considering Michael Della Rocca’s recent claim that Descartes accepted such interaction, and that his doctrine of the creation of the eternal truths indicates how this interaction could be acceptable to him. Though I agree that Descartes was inclined to accept real bodily causes of motion, I differ from Della Rocca in emphasizing that his ontology ultimately does not allow for them. This is not the end of the story however, since two of Descartes’s successors offered incompatible ways of developing his conflicted account of motion. I contrast the occasionalist view of Nicolas Malebranche that changes in motion derive directly from divine volitions with the non-occasionalist claim of Pierre-Sylvain Regis that such changes derive from a nature distinct from God. In light of Della Rocca’s interpretation, it is noteworthy that the issue of eternal truths is relevant to both alternative accounts. Indeed, Regis took the doctrine that such truths are created to provide crucial support for his alternative to an occasionalist account of body–body interaction. What does not help Della Rocca, however, is that Regis’s view of motion requires a fundamental revision of Descartes’s ontology.     

Descartes’s changing mind

Descartes is always concerned about knowledge. However, the Galileo affair in 1633, the reactions to his Discourse on method, and later his need to reply to objections to his Meditations provoked crises in Descartes’s intellectual development the import of which has not been sufficiently recognized. These events are the major reasons why Descartes’s philosophical position concerning how we know and what we may know is radically different at the end of his life from what it was when he began. We call this later position Descartes’s epistemic stance and contrast it with his earlier methodological, metaphysical realism. Yet Descartes’s epistemic views cannot be separated from other aspects of his work, for example, his views concerning God, causality, metaphysics, and the nature of science. A further meta-implication is that serious errors await any scholar who cites early Cartesian texts in support of late Cartesian positions, or who uses later texts in conjunction with early ones to support a reading of Descartes’s philosophy.     

论明清石湾陶艺的美学特色

明清是石湾陶艺创作风格、艺术特色的奠基时期。明清石湾陶艺注重表现,富有生活气息,简约质朴,豪放自然,尤其在人物眼神与衣纹的刻划、“素胎烧制”等艺术表现技巧方面所作出的探索,终经后来历代艺人的发扬光大,已成为今天石湾陶艺所特有的“有意味的形式”,并展示出强烈的艺术魅力。     

匠心独具成奇章--余秋雨山水随笔艺术特色浅析

余秋雨的山水随笔，具有非常鲜明的艺术特色：立意的凝重美与模糊多蕴的审美效果，颇具品位的智性美，叙事美与探索式结构，独具风格的语言美，以及以上述特征为主体所形成的文体美。     

粉煤灰的理化性质及其资源化的现状与展望

粉煤灰是火力发电厂的主要废弃物，其产量大、占地多，易形成扬尘，并污染地下水，造成严重的环境问题。本文介绍了粉煤灰的物理化学性质及特点，及其国内外的资源化利用现状，并从工业建筑、农业利用和环境影响与污染治理的三个方面做了分析与探讨，最后对粉煤灰的未来利用发展作了展望。     

非线性拟双曲方程的特征变网格有限元方法和分析

对神经传播过程中的一类非线性拟双曲方程的初边值问题的三维情形应用常规变换，提出了特征变网格有限元格式，最后通过细致的分析和估计得到了最佳阶的L^2模误差估计结果。     

ZX7-400S型晶闸管逆变焊机的研制

根据交流等效电路论述了晶闸管串联半桥式逆变器的工作原理,并讨论了其输出功率的影响因素,在此基础上研制出了一种ZX7- 400S型晶闸管逆变焊机.这种焊机的电路设计中有延时电路、反馈控制电路、晶闸管保护电路及电压、电流增长率抑制电路.焊机重量轻、高效节能,有较好的工艺性能.     

基于ADAMS的虚拟样机技术研究综述

虚拟样机技术作为新兴的产品开发设计方法,不但可以缩短新产品的开发周期,大大简化复杂机械系统设计;而且还可以提高产品的设计质量,降低研发成本。本文阐述了虚拟样机技术的概念、技术特点以及体系结构,也介绍了基于ADAMS的虚拟样机的设计流程。