访问串行口的新方法

访问串行口可以有多种方法,可以用DOS功能调用,也可以用BIOS功能调用,但是DOS功能调用和BIOS功能调用在实际应用中存在一些问题,通过对串行口的硬件进行改造或直接对8250内部的接口寄存器编程,可以比较好地解决此类问题,在实际应用中能取得良好的效果,对于除了串行口接MODEM以外的其它应用,这种方法都是有效的.     

DELPHI串行通信编程技术与实现

介绍了基于DELPHI环境的多种串行通信编程方法及编程技术,着重讨论了采用MSComm控件实现串行通信的基本方法、技巧,并探讨了微机与多单片机系统间实时远程通信的编程实现。     

What the West could learn from the East: a reflective analysis

Drawing on Lugones’ ideas of world traveling, Dewey’s notion of education as experience, and Greene’s vision of seeing small/seeing big, this article inquires into lives lived in an Eastern educational milieu with attention reflectively paid to what educators in the West could learn from those in the East. Rather than focusing on mega narratives largely created by policy-makers and derived from accumulations of theory and/or political decision-making, this practical research in the reflective vein takes a ‘big’ look at three ‘small stories’ that emerged in a narrative inquiry we conducted in a Chinese elementary school and imagines their portability to Western educational contexts. Reflective attention is specifically paid to: (1) teaching without words, (2) principal images, and (3) shared responsibility for failure. What these small stories from our narrative inquiry research might disrupt, if introduced to Western educational settings, is especially taken up.     

学生分组实验教学中应注意的几个环节

学生实验是培养学生观察、动手、思维能力的重要手段，是完成教学活动必不可少的环节。在进行物理分组实验教学时应该注意认真备课，精心设计，引导学生预习实验，加强实验的基本训练；在教学中应充分发挥教师的主导作用；学生分组实验时切忌教师先演示。     

论建设单位在工程实施阶段的造价管理

在工程实施阶段,虽然节约投资、降低造价的空间不大,但浪费投资、增加造价却有极大的可能性,因此,在此阶段必须组织工程招标,加强工程合同管理,强化施工过程管理,严格控制工程变更,提升工程结算水平,从而切实有效控制该阶段的工程造价,以确保建设单位的投资效果。     

微机系统通信口的应用

介绍微机串行口和并行口的工作原理 ,在通信方面的应用及有关编程方法     

基于语义关联的智库资源知识组织研究

智库是知识决策咨询体系的重要组成部分,其主要通过智库资源的知识发现和智库专家的经验智慧相结合来生产智库产品,进而影响相关领域的知识决策。利用语义关联来构建的智库资源知识组织体系可实现智库资源的知识化、有序化、关联化组织,从而实现智库资源的利用、共享、传播和增值等知识化服务。     

Dynamic Stability Analysis of Cages in High-Speed Oil-Lubricated Angular Contact Ball Bearings

To investigate the cage stability of high-speed oil-lubricated angular contact ball bearings, a dynamic model of cages is developed on the basis of Gupta’s and Meeks’ work. The model can simulate the cage motion under oil lubrication with all six degrees of freedom. Particularly, the model introduces oil-film damping and hysteresis damping, and deals with the collision contact as imperfect elastic contact. In addition, the effects of inner ring rotational speed, the ratio of pocket clearance to guiding clearance and applied load on the cage stability are investigated by simulating the cage motion with the model. The results can provide a theoretical basis for the design of ball bearing parameters.     

高速铁路无线通信系统半实物仿真试验平台

介绍了高速铁路无线通信系统半实物仿真试验平台的结构、工作原理。该半实物仿真平台可以对不同移动速度,在干扰条件下接收信号电平,高速铁路无线电波传播环境进行准确的模拟,配合QoS测试系统与接口监测系统,实现了在实验室环境下对高速铁路无线通信系统的性能进行评估与异常情况分析。与当前广泛采用的现场测试相比,该平台上进行半实物仿真具有实施成本低、周期短,测试环境透明、可控、可重复,不受现场环境的限制,测试完备性有保障。     

网络时代学习理论的新发展——连接主义

连接主义(Connectivism)是国际上新近兴起的E-learning学习理论,被誉为里程碑式的数字时代学习理论。它从神经科学的角度出发,把学习描绘成大量节点相互联结构成网络整体的过程,表现出了比其他学习理论更灵活、更接近人脑实际的优越性。虽然仍有一部分人对连接主义引领网络时代学习理论发展的地位存有质疑,但该理论阐释学习本质的新颖观点和独特视角无疑将促进学习理论研究的新发展。