Lennard-Jones Potential Model
The EJS Lennard-Jones Potential model shows the dynamics of a particle of mass m within this potential. You can drag particle to change its position and you can drag the energy-line to change its total energy. The Lennard-Jones potential function is a reasonably accurate model of interactions between noble gas atoms. The binding energy epsilon is the depth of the potential well and minimum molecular separation are set equal to unity. This simulation uses uses a natural system of units the m
Ejs Parallel Plate Capacitor Model
The EJS Parallel Plate Capacitor model displays a parallel-plate capacitor which consists of two identical metal plates, placed parallel to one another. The capacitor can be charged by connecting one plate to the positive terminal of a battery and the other plate to the negative terminal. The dielectric constant and the separation of the plates can be changed via sliders.
The EJS Helmholtz Coils Model shows a the magnetic field between two circular coils of wire. The default configuration, known as a Helmholtz coil, sets the separation distance D equal to the coil radius R. These values produce a nearly uniform magnetic field B between the coils.
Virtual yeast cell
This rich learning object is used to introduce yeast cytology to students taking Module D24BS3 Brewery Yeast Management as part of the MSc in Brewing Science. The virtual cell permits the students to understand structure and function of yeast organelles.
Constitutional Issues: Separation of Powers
This lesson explores the important Constitutional mechanism providing for the separation of powers of government among three branches so that each branch checks the other two. Lesson plans use the New Deal to help teach this concept.
This course is about using entrepreneurial skills to craft innovative responses to social problems. Entrepreneurs are particularly good at recognizing opportunities, exploring innovative approaches, mobilizing resources, managing risks, and building viable enterprises. These skills are just as valuable in the social sector as they are in business. Social entrepreneurship applies to both profit and non-profit firms who have programs designed to create social value.
Total Ozone Emission
In this activity, students will analyze their nitrogen oxide emissions from all sources (including coal-fired power plants, natural gas combustion, gas-powered lawnmowers, etc.).
The Visual Datasets text module discusses the concept of visual learning and presents some suggestions for ways to design learning environments that support students in developing visual literacy skills. Three visual datasets that can be used for problem solving activities in evolution, classification, development, and botany are included: Caminacules: A dataset of imaginary animals that can be used as the basis for a variety of problem-posing and problem-solving activities in evolution, classi
From 1991 until 1993 the Biosphere system supported people, plants, and animals. Experiments offered the opportunity for tracking in great detail the interactions among land and water ecosystems and the atmosphere. SimBio2 offers several scenarios in which students can generate simulation graphs using actual data from the Biosphere 2 experiment. Studentscan explore some of the problems that affected Biosphere 2 such as higher levels of carbon dioxide than expected and the resulting decrease oxy
Environmental Decision Making
Using the Extend 'connect-the-components' visual programming, students can model and simulate ecosystems including social and economic forces as well as study parameter variations to develop an understanding of ecosystem function and productivity. By making 'what if...' changes in the model, the effects of various proposed decisions about the environment can then be shown. EDM includes three ecological systems: Ponds, Grasslands, and Logging. Students can predict results of changes in the mode
CuraÁao is a computer program that simulates the sterile insect release method (SIRM) of pest population suppression, first conceived by E. F. Knipling (1955). The user can investigate the effects of several variables on the effectiveness of the method and discover what happens when some of the basic assumptions of the model are relaxed or violated in some way. The user should gain some understanding of the sorts of things that complicate the application of the technique in situations that are
Cell Differentials offers a visual dataset of white blood cells that gives students practice in developing strategies and techniques for the recognition of these blood cell types. Over 100 different cell images are randomly presented with feedback on successful identification. In traditional labs, the recognition of white blood cell types can be compromised by several factors. Developmental changes can make recognition difficult and some cell types exhibit similar features. Microscopy can be a
Environmental Explorers' Club
This is a place where kids can learn about the environment and the Environmental Protection Agency. It features plants and animals, air, water, people and the environment, recycling, and a clubhouse area containing art, a game room, a science room, and a trophy room listing the winners of the President's Environmental Youth Award.
An Integrated 3D Geodatabase for Palladio's Work
The paper presents a novel digital 3D GIS web-based system entirely founded on Google Earth, built to offer a deep insight into Palladio's opera for restitution of its architectural surveys, reconstruction for historical reasons, analysis for structural and other options, and assembly and presentation of all certified Palladian documentation.The development of the application follows the philosophy of visual computing and it is based on an architectural knowledge representation.The information s
The people who came to California in search of gold were faced with the threat of disaster in every step of their journey. Many came by ship, even though shipwrecks were commonplace ? one set of lithographs depicts four shipwrecks that occurred within 60 days. Earthquakes were another fact of life in California. Sensational newspaper illustrations like "Earth Quakey Times," and photographs showing buildings in shambles, helped build the state's reputation as an "earthquake capital." Earthquakes
Medicine Games: Incredible Megacell Game
Play a game and find out about a Nobel Prize awarded discovery or work! The compartments of the cell, the organelles, are so small that it was impossible to study their structure until the electron microscope became available in 1938. Albert Claude, Christian de Duve and George E. Palade were awarded the Nobel Prize in Physiology or Medicine in 1974 for developing methods making it possible to take a closer look at the organelles and for discovering some of them.
Development and characterization of surfactant aggregates as pseudostationary phases in electrokinet
Electrokinetic chromatography (EKC) is a mode of capillary electrophoresis based on the partitioning of solutes between a second retentive phase and the run buffer. The second retentive phase, known as a pseudostationary phase, can be comprised of an array of materials including: micelles, vesicles, microemulsions, cyclodextrins, crown ethers and polymers. Due to the variety of possible additives as well as the versatility of the technique, EKC has been used for a wide variety of applications in
In-vitro tiered approach alternative to live animal testing for determination of ocular or dermal ir
There is a continual need for information concerning the potential for chemicals, if inadvertently splashed into the eyes, to cause effects from irritation to total blindness. This information is currently generated by exposing the eyes of live rabbits to the chemical. As can be imagined, this often results in severe distress to the animal while generating information that we have shown to be discernable without putting any animals at risk. This may be accomplished by replacing the live animal t
Essential Science for Teachers: Life Science: Session 4. Plant Life Cycles
What is a plant? One distinguishing feature of members of the Plant Kingdom is their life cycle. In this session, flowering plants serve as examples for studying the plant life cycle by considering the roles of seeds, flowers, and fruits. A comparison to animal life cycles reveals some surprising similarities and intriguing differences.,Seeds and their plants are similar to eggs and animals.