Many systems involve some type of time keeping. By using 555 integrated circuit in astable state it is easy to design and make accurate and cheap timing circuit (e.g., alarm circuit, counting circuit, sensing circuit, etc.) The working principle of this 555 IC in astable state is supported by the following formulae: Timing period, Timing=(R1+2R2) C/1.44.

Active Lessons are engaging, technology-based, student-centered (pupil-centered) learning activities designed by teachers using PowerPoint (or other presentation tool). The idea is to empower teachers to easily create technology-based activities that draw upon variety of existing and new digital resources from internet, repositories of learning objects and other sources, and require students to use technology and create artifacts demonstrating their understanding. This idea partially challenges WebQuest approach and proposes that instead of getting teachers to design web sites, more effective strategy would be to use a presentation tool to design in more productive way. Active Lessons are technologically simple because PowerPoint is used for design and there is no need to struggle with technicalities of web publishing. With reduction in technicalities teachers can concentrate on pedagogy. The central hypothesis in this proposal is that if teachers develop understanding of technology-supported pedagogy, technicalities will synch in naturally through experience and emerging needs.

This items very briefly describes the concept of factorization.

In this simulation you will investigate relationships between voltage, resistance, and current that exists in an electric circuit. You will adjust voltage of the power source and resistance of the resistor and then use digital multimeter to obtain measurements. Then you will record these measurements and look for relationships that exist between voltage, resistance, and current.

This is a simulation that shows how the boiling point of water changes as the altitude changes.

In this simulation, students will explore the flow of current through an electric circuit that includes a battery, a resistor, and a bulb.

This workshop explores how contemporary technology tools empower students and teachers to engage in highly creative and reflective tasks to organize and present information, and express emotions, ideas and knowledge through multimedia creations known as digital stories. Digital storytelling is increasingly becoming popular in schools all over the world as an engaging technology-based learning strategy. In this workshop, the participants will be exposed to powerful user-friendly and cost-free technology tools and techniques for digital storytelling.

This is an activity in which students need to figure out how to dismantle a centrifugal pump using a list of tools.

In this activity, students can select values for quadratic function coefficients, plot and explore multiple functions.

This is an activity that shows that probabilities of getting head/head, head/tail, and tail/tail when you throw 2 coins at the same time 30 times.

This is a simulation that shows how changes in the power of a pump, changes water flow.

This is an interactive display that allow exploration of four key tones in Chinese language

This item presents information about global warming, ozone depletion, and acid rain. Includes great graphics.

This item presents information about alternative sources of energy, using industrial control techniques, and the role of tress and oceans in keeping the air clean. Includes great graphics.

By clicking on pictures that show various food and cutlery items, one can hear how these items are pronounced in Russian.

A learning object is best described as a representation designed to be reused in different educational contexts. In this page you will references to my papers and examples of various learning objects develop either by my self or by my students. Learning objects might reside in digital repositories, ready to be located and utilized by those involved in educational activities (e.g., teachers and students). They address: (a) key concepts from disciplines, in visual and often interactive ways not permitted with previous technologies, for sharing of socio-historical heritage of humanity (our knowledge), (b) information and data that can be useful in the context of developing disciplinary-specific thinking, culture of practice, spirit of inquiry, theoretical knowledge and information work, (c) presentation of small, instructional sequences and demonstrations delivering encapsulated descriptions of some aspects of subject matter which can support learning processes by providing "just-in-time" information, (d) simulations of key equipment, tools and processes from a discipline to enable development of deep understanding of artifacts used in a culture of practice. My immediate intention is to empower education professions with digital material which they can use to create a spectrum of educational activities.

Through this simulation, students can change the parameters of a grinding wheel and explore the effects of those changes.

Through this simulation, students can change the parameters of a turning wheel and explore the effects of those changes.

This items presents information about the main elements of earth's atmosphere and major air pollutant gases.