This simulation shows time-dependent 1D quantum bound state wavefunctions for a number of different wells. Position, momentum, parity, energy, and current can all be viewed, with phase shown with color. Eigentstates can be selected using the energy level diagram. Multiple-energy-eigenstate wavefunctions can be created through changes in the amplitude and phase of the basis states using spinors. Postion and energy measurements can be taken, resulting in new states of the system.

This simulation explores the transitions between quantum states in a number of 1D systems. The time-dependent wavefunction is displayed. An electric field resonant with the transition between states is applied and the changes in the wavefunction with time are tracked. The dipole transition probability is displayed for different initial to final state transitions, and the user may select the transition they wish to observe.

This problem with multiple solutions offers an opportunity for students to practice simple addition and subtraction, work with number sentences (equations), and develop systematic work habits. Given cards containing the addition, subtraction and equal signs along with the digits 2, 4, 6, and 8. solvers are challenged to find as many ways as possible to arrange some or all seven cards to create true statements. The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for extension and support, printable cards (pdf) and a link to an interactive Flash applet.

This Java applet game promotes mental math and strategic thinking skills using a card from Suntex's 24 Game. The player is presented with four numbers (1-9) on a card. The goal is to manipulate each of the four numbers only once so that the end result is 24. Addition, subtraction, multiplication, division and/or parentheses maybe used and the player must be able to enter the expression using the online calculator.

This simulation shows time-dependent 2D quantum bound state wavefunctions for a circular hard-walled potential. Position, momentum, angular momentum, and energy of the states can all be viewed, with phase shown with color. Eigentstates can be selected using the energy level diagram. Multiple-energy-eigenstate wavefunctions can be created through changes in the amplitude and phase of the basis states using spinors, or through the creation of Gaussian wavefunctions with the mouse. The quantum numbers of the states are shown.

This applet simulates the electric field of many charge distributions, including point charges, line charges, dipoles, cylinders, conducting planes and more. The color can be adjusted for field magnitude or potential. Equipotential or field lines are optional. The field strength and number of particles are adjustable. The field can be displayed as a velocity field or a force field. The description is also available in German.

This simulation shows time-dependent 2D quantum bound state wavefunctions for a harmonic oscillator potential. Position, momentum, angular momentum (for symmetric potentials), and energy of the states can all be viewed, with phase shown with color. Eigentstates can be selected using the energy level diagram. Multiple-energy-eigenstate wavefunctions can be created through changes in the amplitude and phase of the basis states using spinors, or through the creation of Gaussian, elliptical, or square wavefunctions with the mouse. The quantum numbers of the states are shown.

This simulation shows time-dependent 2D quantum bound state wavefunctions for a rectangular hard-walled potential. Position, momentum, and energy of the states can all be viewed, with phase shown with color. Eigentstates can be selected using the energy level diagram. Multiple-energy-eigenstate wavefunctions can be created through changes in the amplitude and phase of the basis states using spinors, or through the creation of Gaussian, elliptical, or square wavefunctions with the mouse.

The applet simulates various vector fields, including spherical, radial, and constant plane. It is a generalized version of an electrostatic field simulation by the same author. The field strength and number of particles simulated are adjustable. Divergence, curl, and potential can be color-coded. Grid lines, potential lines, or streamlines can be displayed. Directions, specific links to the subject and source code are also included.

Created by David Lane of Rice University, this applet simulates experiments using 2 x 2 contingency tables. You specify the population proportions and the sample size and examine the effects on the probability of rejecting the null hypothesis. The author provides instructions and then five different exercises to practice these concepts. Overall, this is a nice interactive resource that allows users a more hands-on approach to statistics.

This applet simulates the electric field and potential for various charge distributions, including point, line, dipole, spherical and other charges. There is also a simulation, with adjustable speed, of a charge moving close to the speed of light. The field can be displayed as a velocity or force field with particles following field lines, or as field or equipotential lines. The potential and fields can be displayed in 3-D or on a movable 2-D slice. The field strength and number of particles is adjustable, and the charge can be reversed. Source code and directions (also in German) are included.

The 3-D Hydrogen Atom Probability Densitites model simulates the probability density of the first few (n = 1, 2, and 3, and associated l and m values) energy eigenstates for the Hydrogen atom (the Coulomb potential). The main window shows the energy level diagram for the solutions to the Coulomb potential in three dimensions. States may be selected either by using the dropdown menu item or by using the energy level diagram and clicking a dark green level, with specific n, l, and m values) which will turn bright green and change the state shown in the 3d visualization window. The probability is shown with a 3d cloud, with higher probability shown as a darker sphere. The simulation uses either simple 3D or Java 3D (if installed) to render the view the probability densities. If Java 3D is not installed, the simulation defaults to simple 3D using Java. The 3-D Hydrogen Atom Probability Densitites model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_qm_hydrogen3d.jar file will run the program if Java is installed.

This applet simulates various magnetic sources, including a line of current, a square loop, a magnetic sphere and a solenoid. Size, number of particles, and field strength are adjustable. Display options include particles in velocity or force fields, field vectors, field lines and potential vectors. The vectors and lines can be displayed in 3D or on a movable 2D slice. Charge can be reversed. Source code and directions are included.

This simulation shows time-dependent 3D quantum bound state wavefunctions for a harmonic oscillator potential. Position, angular momentum, and energy of the states can all be viewed, with phase shown with color. Eigentstates can be selected using the energy level diagram. Multiple-energy-eigenstate wavefunctions can be created through changes in the amplitude and phase of the basis states using spinors. The quantum numbers of the states are shown, and the states can be rotated.

This interactive Flash applet provides a Concentration-type game (called pelmanism in the UK) in which students must discern the properties of three-dimensional solids and their colors in order to match them in pairs. Spheres, cones, prisms and other standard 3-D shapes are hidden face down on cards. Time and number of trials needed to solve are recorded.

This simulation illustrates a wide range of 3D vector fields, including spherical, radial, and linear. The fields can be displayed as vectors, particle trajectories, equipotentials, and other options. The number of particles, vectors, or streamlines, and the field strength are adjustable. Directions and source code are also included. This is an extension of a 3D Electric and Magnetic Field viewer from the same author.

This flexible, interactive Flash applet allows students to explore number patterns and to develop number sense and fluency with addition, subtraction, and multiplication. The student or teacher enters a starting number and a step increment. Both values may be up to 4 digits and either positive or negative. The user then mentally carries out the sequence and enters the resulting 10th and 11th terms. The first 9 terms are color-coded in groups of 3 and may be shown or hidden one group at a time. Users have the option of hiding or showing the starting number and/or the increment.

This math app intended for upper elementary students using the addition and subtraction level and middle school students using all four operations helps players practice their order of operations. This interactive game encourages students to use higher order thinking to use the five numbers and given operations to solve the "target" number by working backwards given the answer but not the equation. The best feature about this math game is that teachers are able to receive immediate feedback of their students’ progress through email. Students do not have to provide an email address in order to play.

9th Grade Math Practice Questions to test addition, multiplication, word-problem skills, and basic algebraic skills. Includes answers and explanations. From the Proficiency Building Activities of the NASA Lewis Research Center K-12 Program.

Talk FC06 in the "Computational and Online Tools for Teaching Physics" session highlights the Open Source Physics (OSP) community of educators that engage, enable and empower teachers as learners so that we create DIY technology tools-simulation for inquiry learning. We learn through Web 2 online collaborative means to develop simulations together with reputable physicists through the open source digital library. By examining the open source codes of the simulation through the Easy Java Simulation (EJS) toolkit, we are able make sense of the physics from the computational models created by practicing physicists. We will share newer (2010-present) simulations that we have remixed from existing library of simulations models into suitable learning environments for inquiry of physics. We hope other teachers would find these simulations useful and remix them that suit their own context and contribute back to benefit all humankind, becoming citizens for the world.

This module introduces the concept of biological absorption, storage and distribution of chemicals.

This tutorial is comprised of 10 modules that offer information, instructional techniques, and practice labs on how to make the most common needs in distance education accessible for individuals with disabilities, and enhance the usability of online materials for all students. The modules center around topics such as making video, flash, word , PDF and many other documents accessible for students with disabilities.

This is a computer-based activity in which students retrieve data from websites maintained by the US Geological Survey (USGS) and the National Weather Service (NWS), and then use that data to test different hypotheses regarding streamflow and precipitation. Students import data from web sites into a spreadsheet program where they can construct scatter plots and perform simple statistical tests. The activity has two components, the first focusing on relations between streamflow and drainage basin characteristics (drainage area, slope, precipitation), the second focusing on trends in annual precipitation at two locations in the USA: Burlington, VT, and Boulder, CO. As part of the second component, students conduct a statistical test to determine if the long-term trends in precipitation are significant.

(Note: this resource was added to OER Commons as part of a batch upload of over 2,200 records. If you notice an issue with the quality of the metadata, please let us know by using the 'report' button and we will flag it for consideration.)

This website provides instructions on how to find and download images directly from the WISE archive. Anyone with an internet connection now has free access to high-resolution infrared images from the WISE mission. These instructions explain how to get the images you want, without using complex terminology and options that may be difficult for the layperson to navigate.

This learning activity from the Advanced Technology Environmental and Energy Center (ATEEC) provides students with the opportunity to use analytical meters and instruments and perform acid deposition sampling. Students will collect samples from various sources over a period of time, then measure pH and develop graphs or charts. Users must download this resource for viewing, which requires a free log-in. There is no cost to download the item.

This module provides an intrioduction to acid and base chemistry. The Arrhenius and Bronsted-Lowry concepts of acids and bases are discussed as well as the pH scale and neutralization reactions.

The Acoustic Monitoring Project at NOAA is observing the ocean through underwater acoustics. At this site, visitors can learn about NOAA's studies in Bioacoustics, Ocean Seismicity, and Environmental Noise. The site also offers many animations dealing with Axial eruption, Atlantic Seismicity, and much more.

This resource from the National Library of Virtual Manipulatives shows students how to rename fractions to have a common denominator and then add them. It is appealing because it visually engages the students by showing them what happens to a unit (a rectangle is used here) as the denominator increases or decreases. As the denominator increases or decreases, the partitions are shown accordingly, and the effect on the numerator is shown as well. This is a convenient, visual way to show students how to manipulate fractions for adding.

Kahn Academy video - How to add and subtract fractions with like and unlike denominators.

Using exposition, graphics, and commercial videos, this module teaches the theory and application of affinity chromatography in the characterization of proteins, nucleic acids, and other biochemical/biomedical systems. Problems and application examples support the tutorial material.

This online manipulative features a virtual balance scale. It offers students an experimental way to learn about solving linear equations involving negative or positive numbers. The applet presents an equation for the student to illustrate by balancing the scale using blue blocks for positive units and variables and red balloons for negative units and variables. The student then works with the arithmetic operations to solve the equation. A record of the steps taken by the student is shown on the screen and on the scale. The applet reinforces the idea that what is done to one side of an equation must be done to the other side to maintain balance. Instructions for using the applet, background information about solving equations, and teaching suggestions are included.

This virtual manipulative allows a teacher or student to represent a linear equation and solve it through the use of a balance beam. Unit blocks (representing 1s) and x-boxes (representing the unknown), are placed on the pans of a balance beam. Once the beam balances to represent the given linear equation, the learner can choose to perform any arithmetic operation to both sides of the equation keeping the beam balanced. The goal, of course, is to get a single X-box on one side, with however many unit blocks needed for balance thus giving the value of x. There is also the option of creating your own equations to solve.

In this Evolution Web feature, test your skills at judging who's who on the tree of life while you learn about the tools and methods of cladistics.

In this activity from ATEEC, students will take a virtual field trip in Google Earth to the Alyeska Marine Terminal in Valdez Alaska to explore how oil is transported, the security measures in place, and environmental impacts of the terminal. The goals of the activity are for students to "visualize the setting of the Alyeska Marine Terminal, explore the security issues of the marine terminal, evaluate the environmental concerns of the marine terminal, and consider the movement of oil from the Alyeska pipeline to refineries on the west coast." This zip file includes a document listing minimum requirements for the included executable file.

The lithograph contains a Hubble Space Telescope image that shows M82, an edge-on galaxy, undergoing a frenzy of star formation. The text explains the possible causes of the galaxy’s unusual appearance and star-birth activity. The accompanying classroom activity is a curriculum support tool designed for use as an introductory inquiry activity. It can be incorporated into a unit that has a scientific inquiry and/or a galaxy evolution theme. During the classroom activity, In Search of … Starburst Galaxies, students use the lithograph images and text to generate questions about the cause of the starburst, a rapid rate of star formation, in M82. They also conduct research to answer their questions. Students then identify the galaxy they think is responsible for igniting the star formation in M82, and must provide evidence to support their choice.

This lithograph contains a Hubble Space Telescope image that shows the colorful Planetary Nebula NGC 2440 with one of the hottest known white dwarfs at its center. The text briefly explains the process of stellar death of sun-like stars and those with a mass greater than eight times the Sun. The accompanying classroom activity is a curriculum support tool designed for use as an introductory inquiry activity. It can be incorporated into a unit that has a scientific inquiry and/or stellar evolution theme. During the classroom activity, In Search of... Stellar Death, students use the lithograph images and text to generate questions about the planetary nebula NGC 2440 and how stars end their lives. Students conduct research to answer their questions then compare the endpoints of different mass stars, providing supporting evidence from their research.

This lithograph features Hubble Space Telescope images and includes text that describes and explains the images. There is also an accompanying inquiry-based classroom activity entitled “In Search of Star Formation.” This activity is designed to encourage the development of research skills and independent thinking. Available online as well as hardcopy. Educators can access the lithograph PDF files on the Web site and print the materials for use in their classrooms.

The Analytic Animator allows instructors to create two-dimensional single-particle kinematics models for teaching. Instructors set two functions, x(t) and y(t), and the model displays the position-space particle motion as well as position, velocity, and acceleration graphs and tables. The customized simulation is then saved with associated curricular as a new jar file that can be redistributed. The Analytic Trajectory Animator Model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_newton_TabletopProjectile.jar file will run the program if Java is installed.

This labware module contains directions for seven experiments in analytical electrochemistry. The experiments are designed to illustrate fundamentals of electrode reactions as applied to readily accessible redox reactants. They provide insight to dynamic electrochemistry for scientists at all levels of training. Activation procedures to prepare glassy carbon electrodes are provided in a TechNote.

The Analytical Sciences Digital Library (ASDL) provides a collection of peer-reviewed web-based educational resources related to technical resources in the analytical sciences. Materials include articles, labware, educational practices, and more.

In this activity, students examine a photograph of the night sky and answer questions about their observations. The picture, taken by a high school student in upstate New York, offers insight into the Earth's rotation, apparent star motion, the location of Polaris (the North Star), circumpolar constellations, and pointer stars.

"Students create their own Mystery Numbers by giving clues about the name, value, and multiples of the digits which comprise the number." from Beacon Learning.

This interactive Flash applet enables students, using estimation and measurement skills, to investigate angles. Teachers can use this page for demonstrating how to read a protractor, and the protractor can be hidden to give students practice in estimating angle measures. The size of the angle can be controlled or chosen randomly.

Meiosis is important in assuring genetic diversity in sexual reproduction. Use this interactive animation to follow Meiosis I (reduction division) and Meiosis II in a continuous sequence or stop at any stage and review critical events.

This animation demonstrates the stages of mitosis in an animal cell. Use the control buttons in the upper left to run the complete animation. Click on any intermediate stage (for example, Anaphase), and see a representative still frame.

Students work step-by-step through the generation of a different Hilbert-like Curve (a fractal made from deforming a line by bending it), allowing them to explore number patterns in sequences and geometric properties of fractals.

WeddellSealScience.com
This Weddell Seal Science website is produced by the Weddell Seal Population Ecology Project based at the Montana State University - Bozeman to present information, video files and multimedia, and social media about the Project's Weddell research in Antarctica. This Weddell Seal Project is funded by the National Science Foundation (NSF), and assisted by the United States Antarctic Program. (USAP). The purpose of the website is to function as a central web portal to make available to the general public, educators and students numerous assets including articles, a seasonal Antarctic field blog, select videos and multimedia on the project, Weddell seals, and the work of the researchers studying the population and mass dynamics of Antarctica's Weddell seals.

This website, created by Paul Trunfio and Gary McGath of Boston University's Center for Polymer Studies, provides the description and instructions for the the Anthill and Molecular Motion Java applet. Some of the topics covered include: mixing, diffusion, and contour plots. Overall, this is a fine resource for any mathematics classroom, especially one interested in statistics.

Aquarium Pyramid features exhibits highlighting the Caribbean (coral reef), South Atlantic (penguins), North Pacific (harbor seals), and South Pacific (Great Barrier Reef). Other Moody Garden attractions are: Rainforest Pyramid with Asian, African and American examples; Discovery Pyramid housing traveling interactive science exhibits. Education programs include school tours and hands-on experiences for grades k-12, outreach, kids' camps. Teachers receive visit curriculum guides, can attend credit workshops and open house. Admission and program fees apply.

This is the education section of a larger site about the Aquarius underwater habitat in the Florida Keys. It includes classroom activities exploring concepts of buoyancy, pressure and light; a series of classroom activities exploring the biology of corals; and an on-line book about coral reef biology.

Students will complete this survey that determines their personal and household contributions to atmospheric Carbon dioxide by using information about their previous year's consumption. They will understand that Carbon dioxide is a greenhouse gas produced by the combustion of fossil fuels, and that its production can be minimized by taking personal steps to conserve.

Learn the relationship between perimeter and area. A shape will be automatically generated with the perimeter that you choose. Calculate the area of this shape. Area Explorer is one of the Interactivate assessment explorers.

This lesson plan helps students understand multi-digit division by constructing area models. The included interactive provides two example problems and helps connect the model to the traditional long division algorithm. Students solve their own problems using graph paper and/or base-10 blocks and progress toward mental strategies.

This interactive Wolfram Demonstration helps students visualize the relationship between multiplication and the area of a rectangle. On a 10x10 multiplication table, with 1 in the lower left and 100 in the upper right, users adjust the size of a rectangle by dragging a vertex or sliders, or by choosing a product from a pulldown list. The resulting rectangle highlights the width, height and area (factors and product) as well as other equivalent areas (products) on the board, illustrating commutativity and multiple factor pairs. Wolfram CDF Player, a free download, is required to view this resource.

Arenstorf orbits are closed trajectories of the restricted three-body problem. That is, two bodies of masses µ and 1-µ moving in a circular rotation, and a third body of negligible mass moving in the same plane. The computation of these orbits is very sensible to small errors and are a good test for the accuracy of numerical methods for solving Ordinary Differential Equations. This simulation compares the solution of two of these orbits using both a 4th-order fixed step and a 5(4) variable step Runge-Kutta algorithm. The adaptive solver uses an event to find the period of the orbit and stop there. Both the computations of the adaptive solver and the event are done with the step size and the tolerance indicated. The Arenstorf Orbit JS Model was developed using the Easy Java Simulations (Ejs) version 5. It is distributed as a ready-to-run html page and requires only a browser with JavaScript support.

Students play a generalized version of connect four, gaining the chance to place a piece on the board by answering arithmetic questions (addition, subtraction, multiplication, division). Parameters: time, difficulty level, types of questions. Arithmetic Four is one of the Interactivate assessment games.

The Arizona-Sonora Desert Museum (ASDM) has been quite the authority on this unique region of the United States for well over 50 years. With funding from the Institute of Museum and Library Services (IMLS), they have been able to create this extensive digital library which documents the area's landforms, animals, plants, minerals, and landscapes. On the homepage, visitors can search the entire collection, and they may also wish to browse the collections, which include sections like "Animals", "Minerals", and "Biotic Communities". The "auto-suggestion" feature is a nice touch, as it suggests possible species and names, such as "salamander" and "eagle". Each entry contains a high-quality photograph, a detailed description, and other relevant information. The site also includes a section of "Kids' Pages", a FAQ area, and an area for those who might wish to contribute to the project.

The EjsS Asset Exchange Model Package contains JavaScript models to investigate the the transfer of wealth in a simple economic model consisting of N buyers and sellers, known as agents, who spend their time buying and selling goods at a yard sale. In this economic model, two agents A and B are chosen at random and goods are exchanged. If the price of the item is correct, neither agent gains or looses wealth but this is uninteresting and unrealistic. In a realistic transaction an agent can either pay too much or get a bargain so that one agent becomes slightly richer while the other agent becomes poorer. What happens to the wealth of agent wA if this process is repeated many times and if we assume that the agent receiving the bargain is chosen at random so that sometimes agent A gains and sometimes agent A looses in the transaction. In other words, neither agent is always shrewd or always gullible so that all agents have an equal chance of getting rich. Does this model produce an equitable distribution of wealth? The EjsS Asset Exchange Model Package was developed using the Easy Java/JavaScript Simulations (EjsS) version 5 authoring tool. Although EjsS is a Java program, it can create stand alone JavaScript programs that run in almost any PC or tablet.

The Astronomical Parallax 2D Javascript Model illustrates This simulation illustrates the phenomenon of parallax in astronomy. Parallax is the apparent displacement of an object relative to the background that is caused by the motion of the observer (rather than the motion of the object itself, or of the background). This simulation illustrates the parallax of an object in space that results from the Earth's rotational or orbital motions. The simulation has two different modes. The default is an Earth Rotation Mode. In this mode the simulation illustrates the parallax caused by Earth's rotation on its axis. The other mode for the simulation is Earth Orbit Mode. In this mode the simulation illustrates the parallax caused by Earth's orbit around the Sun. Now the observer moves along Earth's orbital path (shown as a blue circle with the orange Sun in the center). The bottom window shows the apparent motion of the object being observed. The Astronomical Parallax 2D JS Model was developed using the Easy Java Simulations (EJS) version 5. It is distributed as a ready-to-run html page and requires only a browser with JavaScript support.

This resource includes over 88 paper plate activities, where scientists put their research into laymen’s terms and develop paper plate activities that illustrate their respective pursuits. Paper Plate Education asserts that anything worth teaching ought be reducible to a paper plate. This is also known as Paper Plate Reduction. There are lessons in space science, music theory, archeology, celestial navigation, African-American history, geometry, and art.