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11.
XML的迅猛发展使得对XML更新语言的需求进一步地增强,XML更新语言已成为一个新的研究热点.面向对象的XML-RL更新语言的设计支持具有面向对象特征的XML更新.首先介绍面向对象XML-RL更新语言,其次论述了逻辑操作符和物理操作符的设计思想与具体实现算法. 相似文献
12.
滕琴 《苏州大学学报(工科版)》1998,(3)
本文通过对CAI电磁学实验预习系统的具体开发过程的介绍,在分析其可行性与优越性的基础上,对如何进行此项工作进行初步探讨。 相似文献
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14.
In this article, efficient computational models for ship motions are presented. These models are used to simulate ship movements
in real time. Compared with traditional approaches, our method possesses the ability to cope with different ship shapes, engines,
and sea conditions without the loss of efficiency. Based on our models, we create a ship motion simulation system for both
entertainment and educational applications. Our system assists users to learn the motions of a ship encountering waves, currents,
and winds. Users can adjust engine powers, rudders, and other ship facilities via a graphical user interface to create their
own ship models. They can also change the environment by altering wave frequencies, wave amplitudes, wave directions, currents,
and winds. Therefore, numerous combinations of ships and the environment are generated and the learning becomes more amusing.
In our system, a ship is treated as a rigid body floating on the sea surface. Its motions compose of 6 degrees of freedom:
pitch, heave, roll, surge, sway, and yaw. These motions are divided into two categories. The first three movements are induced
by sea waves, and the last three ones are caused by propellers, rudders, currents, and winds. Based on Newton’s laws and other
basic physics motion models, we deduce algorithms to compute the magnitudes of the motions. Our methods can be carried out
in real time and possess high fidelity. According to ship theory, the net effects of external forces on the ship hull depend
on the ship shape. Therefore, the behaviors of the ship are influenced by its shape. To enhance our physics models, we classify
ships into three basic types. They are flat ships, thin ships, and slender ships. Each type of ship is associated with some
predefined parameters to specify their characteristics. Users can tune ship behaviors by varying the parameters even though
they have only a little knowledge of ship theory. 相似文献
15.
在广东省级精品课程“大学物理”的依托下,对传统的大学物理教学体系进行了优化和改进,把基础知识和专业科学前沿工作相结合,把现代教学手段和研究学习型教学方法相结合,给学生提供探索研究型网络学习环境,激励学生创新思维,提高创新素质。 相似文献
16.
17.
洪韩 《徐州工程学院学报》2004,(1)
互动教学是一种动态的教学过程,通过教学中的互动使师生成为一个“学习共同体”。互动教学须把学习目的作为教学设计的依据和归宿;须让学生参与有实际意义的交流。 相似文献
18.
基于USB接口的介电常数测试仪 总被引:2,自引:0,他引:2
利用单片机技术测量了固体和气体介质的介电常数,给出了测量原理、实验测量方法以及测量电路原理图,并且在Windows环境下利用Delphi7.0可视化编程语言。实现了USB接口通讯的实验数据上位机采集与处理过程,构成了基于USB接口的智能化实验测量系统,并通过实验测试了该系统的可靠性。 相似文献
19.
Based on theories of scientific discovery learning (SDL) and conceptual change, this study explores students' preconceptions in the domain of torques in physics and the development of these conceptions while learning with a computer-based SDL task. As a framework we used a three-space theory of SDL and focused on model space, which is supposed to contain the current conceptualization/model of the learning domain, and on its change through hypothesis testing and experimenting. Three questions were addressed: (1) What are students' preconceptions of torques before learning about this domain? To do this a multiple-choice test for assessing students' models of torques was developed and given to secondary school students (N = 47) who learned about torques using computer simulations. (2) How do students' models of torques develop during SDL? Working with simulations led to replacement of some misconceptions with physically correct conceptions. (3) Are there differential patterns of model development and if so, how do they relate to students’ use of the simulations? By analyzing individual differences in model development, we found that an intensive use of the simulations was associated with the acquisition of correct conceptions. Thus, the three-space theory provided a useful framework for understanding conceptual change in SDL. 相似文献
20.
Dual-energy CT can be represented as the dual-energy equations by decomposing the linear attenuation coefficient of the X-ray scanned object into two material basis functions of photoelectric absorption and Compton scatter. To solve the dual-energy equations, in this paper, we apply the mean-value theorem for integrals and propose a new projection-based iterative algorithm. We discuss the convergence of the proposed algorithm and carry out various numerical simulations for demonstrating its feasibility. 相似文献