火焰形状对其热辐射通量的影响

在火灾中火焰的形状是不固定的,因此在工程计算中通常将其假定为特定的几何形状以简化热辐射通量计算。在计算中通常采用的几何形状有圆柱形、圆锥形、立方柱形、长板面形和点源。本文采用蒙特卡洛法计算五种火焰形状下的热辐射通量。通过比较得出火焰形状对其热辐射通量的影响因素。     

探究性学习在数学教学中的应用研究

数学教学是一种抽象性较高的教学,我国的数学教学活动在长期的发展中已经逐渐形成具有特色的数学教学系统,在当前情况下,我国的数学教学活动主要采用"填鸭式教学"的教学模式,这种教学模式虽然在一定程度上提高了数学教学的有效性,但是也阻碍了学生创新能力的发展,目前,探究性学习已经成为新课改形势下的新型教学模式,本文主要探讨探究性学习在数学教学中的应用。     

探究性学习在数学教学中的应用研究

数学教学是一种抽象性较高的教学,我国的数学教学活动在长期的发展中已经逐渐形成具有特色的数学教学系统．在当前情况下,我国的数学教学活动主要采用“填鸭武教学”的教学模式,这种教学模式虽然在一定程度上提高了数学教学的有效性,但是也阻碍了学生创新能力的发展,目前．探究性学习已经成为新课改形势下的新型教学模式,本文主要探讨探究性学习在数学教学中的应用。     

The variation of the residual ionization with pressure at different altitudes,and its relation to the cosmic radiation

Measurements have been made of the residual ionization in a closed vessel of steel one inch thick, shielded by a two inch casing of lead, over a range of pressure from atmospheric to one thousand pounds per sq. inch, at Pike's Peak (alt. 14,000 ft.), Colorado Springs (alt. 6,ooo ft.), and New Haven (alt. 6,000 ft.). The ionization-pressure curves presents features of interest in relation to the interpretation of the processes associated with ionization in the vessel. However, in the present investigation they are used simply to obtain average relative value of the ionization due to the cosmic rays at the three altitudes concerned. A method of correcting the observations for absorption by the iron sphere, the lead case, and the walls of the buildings, has been developed. It is found that the data for the three stations can be correlated by the assumption of a pair of frequencies in the original cosmic radiation; and, as a matter of fact, an infinite number of such pairs are possible. They are represented in graphical form in Fig. 7 If we permit the assumption of three different frequencies in the cosmic radiation, it is possible in general to assign two of the frequencies, and determine an infinite number of possibilities as regards the third, distributed over a definite range. The possibilities inherent in the assumption of three frequencies are contained in tabular form in Table XVII. Of course, the inclusion of observations from more than three altitudes would serve to fix more definitely the possibility as regards the analysis. However, the result of the analysis for the three stations concerned is possibly of interest for comparison with other data, and as an indication of the kind of information which it is possible to extract from observations of this kind. It is probable that the very large range of possibilities inherent in a solution with three coefficients of absorption will be rather surprising to anyone who considers a situation of this kind for the first time.In addition to those whose assistance has already been acknowledged, I wish to acknowledge the assistance of Professor J. W. Broxon, who visited me while on Pike's Peak, and assisted in setting up the apparatus; and my thanks are due to Mr. C. A. Kotterman, and particularly to Mr. Andrew Longacre, and Mr. W. E. Ramsey for assistance in the reduction of the observations, and in the computational work.     

电子政务信息获取中信息分化探究

通过对电子政务环境下政务信息获取过程中的信息分化表象、负面效应的分析,提出了控衡电子政务信息获取中信息分化的主要措施.     

资源型城市产业转型的探讨

产业转型对资源型城市的可持续发展具有重要意义。通过分析资源型城市产业转型的方向和不同区域增长理论的特点，确定了在资源型城市产业转型不同阶段应采用的区域增长理论，对我国资源型城市产业转型的具体实施有一定借鉴意义。     

浅析道德相对主义在现代社会愈演愈烈的原因

毫无疑问,我们生活在一个道德相对主义盛行的时代。笔者主要从三个方面对道德相对主义在现代社会泛滥成灾进行了分析。这三个方面分别是：文化上的多元主义、现代价值对传统价值的颠覆以及后现代思潮的肆虐。     

Flash在技能训练动画制作中的应用探究

采用Flash实现技能训练动画是一种趋势所在,能够受到广大受众的欢迎.本文充分发挥Flash的优势特点,为技能训练动画提供展示平台,从技能训练动画制作的特点进行分析,并提出了关键技术所在,为技能训练动画的制作提供了参考.     

论研究式教学在干部教育培训中的运用

研究式教学是适应新时期干部教育培训教学改革、适应教学对象特点和需要的一种教学方法,具有开放性、探究性、实践性、自主性和协作性的特征,实施步骤主要分为课题形成、课题研究和研究课题成果的转化三个阶段。     

课堂教学有效性的理论探究与实践探索

课堂教学有效性研究已如同雨后春笋般随处可见,究竟什么样的教学是有效的？其指标是什么？教学实践中如何贯彻这些指标？本文围绕学生学习的幸福体验,从理论与实践两个层面进行了初步的探索。     

浅谈如何搞好探究性实验教学

探究既是科学学习的目的,又是科学学习的方法。在实际的科学课程教学中,探究要贯穿学生科学探究过程的始终。作为教师,我们要引导学生提出问题,激发他们的探究欲望,让学生主动探究,自主探究。在科学实验的探究过程中,要注重探究过程、注重合作学习、注重课程开放。     

地方高校实施探究式教学模式的研究

地方高校普遍面临关于整体教学质量的一系列问题,影响了教学质量的提高,实施探究式教学模式能够更好地适应新形势下本科教育的需要,提高学生的创新、创业能力。