Digital Signal Processing Tools
A collection of seven Java applets and associated tutorials are available on this site from the Signals and Systems Group at the University of Edinburgh. The tools illustrate various concepts of digital signal processing, like convolution, correlation, the Fourier transform, and discrete-time applications of each. Seven other applets that demonstrate more advanced concepts are also available, but no documentation or explanation accompanies them. A few conference publications and reports related
World AIDS Day 2004
From the Joint United Nations Programme on HIV/AIDS, this website provides information and images related to Worlds AIDS Day 2004. Notably, the site contains a downloadable version of the _AIDS Epidemic Update 2004_, which "provides the most recent estimates of the epidemic's scope and human toll, explores new trends in the epidemic's evolution, and features a special section on women and AIDS." In addition, site visitors can download a set of eleven epidemiological PowerPoint slides based on th
White House: President's Critical Infrastructure Protection Board
A draft of the Bush administration's National Strategy to Secure Cyberspace was released September 18, 2002. The 65-page report, spurred primarily by the risk of cyber terrorism, can be viewed at this Web site. It assesses the most serious threats to, and most vulnerable areas in, small operations, large enterprises, and critical sectors like government. After identifying some of the current weak areas in Internet infrastructure, the report makes suggestions about the best practices for correcti
A Butterfly's Life
Teachers in the market for lesson plans about butterflies can find hundreds of pages of Web-based material, but those looking for something simple and straightforward might be interested in this Web site, a joint project of Lotus School, Hult Museum, and the Wildlife Prairie Park in Illinois. Well-organized pages of text and images offer descriptions of butterfly migration, life cycle, habitat, food web, body parts, and gender. The site also provides research questions and steps that "outline a
Predicting Invasions of Nonindigenous Plants and Plant Pests
This Web site contains the free book Predicting Invasions of Nonindigenous Plants and Plant Pests provided by the National Academies Press. Compiled by the US Board on Life Sciences and the Board on Agriculture and Natural Resources, this 194-page book explores the difficulties in predicting the immigration and impact of exotic species. Researchers active in this field may find this free resource of use.
Earth Science Week
The American Geological Institute organizes Earth Science Week (ESW) each year in October "to help the public gain a better understanding and appreciation for the Earth Sciences and to encourage stewardship of the Earth." The website offers highlights, evaluations, and news clippings of past ESW events. During the months leading up to ESW, users can search for Earth Science events taking place in their area. Teachers can find numerous classroom activities for grades K-12 based in the National Sc
Design a Parachute
After a discussion about what a parachute is and how it works, students will create a parachute using different materials that they think will work best. The students will test their designs, which will be followed by a class discussion (and possible journal writing) to highlight which paper material worked best.
Teachers can direct students to this material to help them investigate a career as a zookeeper. Having students review this page can be an excellent precursor to a job-shadowing activity. The discussion board's set of questions and answers can be a helpful resource for an activity in which students produce a number of pertinent questions that should be asked of a zookeeper when investigating this field of work.
Building a Bloom
This activity will help students understand algal blooms. They will devise their own experiments to test the effects of nutrients on algal growth, or younger students may follow the steps outlined in a sample activity which is provided. Students will be reminded that they need to have controls and replicates in their experiments. As a result of this activity, students will come to understand the requirements for algal growth, understand the factors that influence the occurrence and duration of a
Place constraints on a triangle and determine what classifications must apply to the triangle.
Trees, soil and water : Journey to Forever
Trees, soil and water: Journey to Forever - healthcare for mountains, trees for deserts, trees for people, forest, forestry, deforestation, erosion, soil conservation, water conservation, desertification This article discusses the interdependence between trees, soil, and water from a biological and conservationist standpoint.
Tides and gravity labs
How does gravity cause tides in the oceans? This section, part of an interactive laboratory series for grades 8-12, introduces students to four activities on tides and gravity that cover critical orbital speed between Earth and the moon, gravitational forces between two bodies, tidal effects from the sun and moon, and the change in tidal levels over time. The activities include hands-on animations of concepts whose variables can be manipulated by students. Questions posed to students include ans
Ecological Footprint: Overshoot
In this two-minute sound segment, the director of the Sustainability Program for the public policy group Redefining Progress discusses the concept of your ecological footprint. This is the amount of nature it takes to support your lifestyle. He says that if we use more than can be replaced by nature we are in a condition called overshoot. He suggests that this can continue for a while but eventually someone will have to pay with a lower standard of living. This site is from an archive of a daily
How can a quarter be removed from the bottom of a stack of quarters without lifting or moving the other coins? This material is part of a series of hands-on science activities designed to arouse student interest. Here students investigate the properties of inertia and Newton's first law of motion. The activity includes a description, a list of science process skills and complex reasoning strategies being used, and a compilation of applicable K-12 national science education standards. Also provid
What about the nucleus?
What holds the nucleus together? This web page, part of a tutorial on particle physics, focuses on what possible forces may hold the nucleus together. Students are questioned why the nucleus doesn't blast apart due to all of the positive particles packed so tightly together. Students learn that electromagnetic forces and gravitational forces are not strong enough to hold the nucleus together. Copyright 2005 Eisenhower National Clearinghouse
2.14 Summing up
This unit is concerned with macroevolution – the patterns and processes of evolution above the species level. A crucial consideration in macroevolutionary studies is that of the evolutionary relationships (phylogeny) of the organisms in question. The unit begins with an introduction to the scope of macroevolutionary studies and illustrates methods of reconstructing phylogeny, from both morphological and molecular data.
Decarteret matches pole vault record at Florida State
The Northeastern women's track & field team recorded 15 top-10 marks, including another record-breaking performance by Jillena Decarteret, amidst stiff competition at this weekend's Florida State Relays in Tallahassee, Fla. Decarteret tied the school record in the pole vault with a winning performance of 4.06m (13'3.75), beating out 20 others for the title. The sophomore's vault matched Laura Chmielewski's mark set back almost seven years ago on May 8, 2004. Decarteret has continued to make upw
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Bees are Master Pollinators and Cannot be Mimicked Cost Effectively
The study of biomimicry and sustainable design promises great benefits in design application. It affords means by which to promote cost-effective, resourceful, non-polluting avenues for new enterprise. These “blueprints” have existed previously as underappreciated strategies by relatively unfamiliar organisms. An important final caveat, however, must still be addressed. One cannot leave the student with the misunderstanding that once copied, species are expendable. Biomimicry is intended to