一种石油热采密封技术的研究

采用3级(导套、浮动密封环组、盘根)组合密封结构设计方法，实现石油热采密封系统的密封要求．利用层流间隙密封与轴向端面密封理论，确定出系统的密封间隙．采用接触与非接触结构混合密封方式并配合所选择的密封材料的自润滑性质，解决并实现系统的润滑要求．通过试验研究得到所希望的密封效果.     

高校体育课成绩评价体系的再思考

当前高校体育课成绩评价体系与教改相比已经相对滞后,主要体现在评价目的偏移、内容片面单一、方法不合理以及标准缺乏弹性等方面.为此,要构建科学合理的成绩评价体系,必须要转变评价目的、改变评价重点及改革评价方法与标准.     

一种图像汉字智能识别机的研究

文章将智能控制与模式识别方法相结合,提出了一种仿人识字行为的图像汉字智能识别机;采用决策控制级、模式识别级和反馈校正并行式结构。决策控制级选择最佳的识别策略和参数,模式识别级进行多分类器结果融合识别,并根据对模式识别级输出的可信度判断结果进行反馈,校正识别方法和参数,最终提高汉字的识别效率。     

Coincidence and reproducibility in the EHT black hole experiment

This paper discusses some philosophical aspects related to the recent publication of the experimental results of the 2017 black hole experiment, namely the first image of the supermassive black hole at the center of galaxy M87. In this paper I present a philosophical analysis of the 2017 Event Horizon Telescope (EHT) black hole experiment. I first present Hacking's philosophy of experimentation. Hacking gives his taxonomy of elements of laboratory science and distinguishes a list of elements. I show that the EHT experiment conforms to major elements from Hacking's list. I then describe with the help of Galison's Philosophy of the Shadow how the EHT Collaboration created the famous black hole image. Galison outlines three stages for the reconstruction of the black hole image: Socio-Epistemology, Mechanical Objectivity, after which there is an additional Socio-Epistemology stage. I subsequently present my own interpretation of the reconstruction of the black hole image and I discuss model fitting to data. I suggest that the main method used by the EHT Collaboration to assure trust in the results of the EHT experiment is what philosophers call the Argument from Coincidence. I show that using this method for the above purpose is problematic. I present two versions of the Argument from Coincidence: Hacking's Coincidence and Cartwright's Reproducibility by which I analyse the EHT experiment. The same estimation of the mass of the black hole is reproduced in four different procedures. The EHT Collaboration concludes: the value we have converged upon is robust. I analyse the mass measurements of the black hole with the help of Cartwright's notion of robustness. I show that the EHT Collaboration construe Coincidence/Reproducibility as Technological Agnosticism and I contrast this interpretation with van Fraassen's scientific agnosticism.     

Prediction from the One‐Way Error Components Model with AR(1) Disturbances

In this paper we extend the works of Baillie and Baltagi (1999, in Analysis of Panels and Limited Dependent Variables Models, Hsiao C et al. (eds). Cambridge University Press: Cambridge, UK; 255–267) and generalize certain results from the Baltagi and Li (1992, Journal of Forecasting 11 : 561–567) paper accounting for AR(1) errors in the disturbance term. In particular, we derive six predictors for the one‐way error components model, as well as their associated asymptotic mean squared error of multi‐step prediction in the presence of AR(1) errors in the disturbance term. In addition, we also provide both theoretical and simulation evidence as to the relative efficiency of our alternative predictors. The adequacy of the prediction AMSE formula is also investigated by the use of Monte Carlo methods and indicates that the ordinary optimal predictor performs well for various accuracy criteria. Copyright © 2011 John Wiley & Sons, Ltd.     

我国刑法中的危险犯

危险犯的定义,是刑法理论上争议颇多的问题。我国刑法以维护公共安全为目的规定危险犯的构件,以法定的危险状态作为刑法处罚的依据。明确危险犯构件的组成,了解危险犯的本质和特征,有利于认清危险犯的存在和对危险犯罪的防范。     

数学实验课的研究与认识

对数学实验这门课程的起源、目的、意义和作用做了明确的阐述。并对课程的内容和教法做了深入的讨论研究,建议数学实验课应该建设成为一门大学数学的技术基础课。     

制约非英语学习成效的消极情感因素分析及对策

消极情感是制约英语学习成效的主要因素之一。低成就动机、语言焦虑和抑制是三大主要消极情感。相应的对策是加强成就动机训练,减低焦虑和抑制,增强自信,培养学生积极的情感态度。     

浅谈思想政治教育实效性的方法论基础——主体间性原则

思想政治教育不仅是传播主流意识形态的主阵地,更是引领当代大学生树立正确的世界观、人生观和价值观的精神向导.它的实际效果如何,直接关系到"为谁培养人?培养什么样的人?"的重大问题.为了使思想政治理论教育的实效性达到最优化,实现由单一式的主体性思想政治教育向主体间性思想政治教育模式的转向,探讨主体间性原则在思想政治教育理论中地位和作用,为思想政治教育理论寻找一种新的哲学范式和方法论原则,不仅是思想政治教育研究的一种理论创新,更是思想政治教育实践发展的必然要求.     

运用反馈法提高田径课教学效果的探讨

根据田径教学的特点,运用反馈原理设计、检查、调控与改进教学,教师能及时获得反馈信息,对学生的学习过程加以全面控制,实践中收到了良好的效果．