This is based on a recent blog post 'Helmhurts' at www.jasmcole.com, which was featured on io9, Ars Technica, the Daily Mail, Scientific American and many other blogs.
This app uses the 2D Finite Difference Time Domain method to solve Maxwell's equation on a Cartesian grid. An example floorplan is included in the app.
How to use:
Your floorplan needs to be a .png file, with empty space marked black and materials marked with colours. Images will be converted into the correct materials on loading - this may take a few seconds.
Pixels are mapped to 1 centimetre, so scale the floorplan appropriately.
The simulation is limited in speed due to the mobile processor, so try to keep images below approximately 500x500 pixels
Touch the image to set a router location, marked by a red circle. Select the antenna parameters at the bottom.
Set the number of iterations to run for, how often to plot the result, and the upper limit on the colourmap scale.
Choose a field to plot - the default is the out-of-plane electric field.
Click run and the simulation will begin. Click stop to pause at any time - this saves the simulation progress which can be continued by clicking run again. To reset, open an image again.
To save the simulation output as an image, click Save at any time. Images are saved to internal/external storage and added to the end of the camera roll.
To start recording a simulation click the record 'R' button. When the simulation is stopped a GIF animation is generated.
Under the bonnet:
An antenna oscillates at 2.4 GHz. The edges of the image use absorbing boundary conditions as in Mur 1981, IEEE Transactions on Electromagnetic Compatibility.
Where walls are defined, the relevant refractive indices and loss tangents for 2.4GHz radiation are used.
Wavelength and resolution are currently constant, this may change in a future release.
This app is not intended as a replacement for existing EM simulation software packages.
As a 2D approximation including only simple walls it does not accurately model a given floorplan.
It is, however, a bit of fun and entertaining to play with.
The topics include day to day usage explained through simple examples with a detailed solution.
The topics include :
1. Simple Equation Problems
a. Length Problems
b. Age Problems a
c. Number problems
a. Percents and Numbers
b. Percentage Increase and Decrease
d. Interest Problems
3. Mixing problems
a. Stamps and Coins
b. Liquids with Different Strengths
4. Ratio and Proportion
5. Rate Problems
a. Motion(Speed) Problems
b. Work Problems
6. Statistics and Probability
a. Basic Terms & Definitions
b. Descriptive Statistics
i. Frequency Distribution
ii. Graphical Display of data
iii. Central Tendency and Variability
i. Basics of Probability>>> slides
ii. Discrete Probability Distributions
ОБЯЗАТЕЛЬНО ЗАПУСТИТЬ ОДИН РАЗ ДЛЯ РЕГИСТРАЦИИ В СИСТЕМЕ!
(бета-версия; есть вероятность, что не у всех и не всегда работает)
Приложение, которое автоматически вводит данные для входа в интернет вместо вас при каждом подключении к Wifi в стенах Национального Исследовательского Университета «Высшая школа экономики».
Не ест батарейку, не ворует данные, не работает в других университетах.
Пулл-реквесты и баг-репорты приветствуются, код открыт:
Приложение не официальное, никак не связано с руководством НИУ ВШЭ(кроме известных фактов его использования преподавателями :) ), это проект для саморазвития и просто спасение от постоянного ввода давно выученных каждым студентом "hse.....", "hse........" (написано в каждом холле или можно подглядеть в исходном коде, если забыли :) )
HIGHLIGHTS OF IXL MATH PRACTICE
- Comprehensive coverage of K-8 math curriculum
- Wide variety of question types to engage students
- Virtual prizes and awards to celebrate learning milestones
- Insightful reporting on all app practice at IXL.com
- Over 10 billion unique problems answered on IXL.com
“Thanks to IXL, our students' performance has increased dramatically. Because they practice the skills daily, and because the site provides feedback, students are able to correct their mistakes and master the concepts easily.”
Waleska Batista, teacher, Cherry Hill, New Jersey, U.S.A.
“My favourite feature of IXL is that if you get a question wrong IXL will tell you how to solve it and what you did wrong. Another thing I really enjoy is that IXL provides awards and progress reports showing how you do over time. I think these two things are very effective because they make the student feel like they are actually studying and not wasting time.”
Student, Calgary, Alberta, Canada
“This program takes the frustration out of math because it allows the student to practice at his/her own pace and stay focused. It's okay if you mark one wrong because another one will be waiting. This is a great tool to have.”
Parent of a 4th grader, California, U.S.A.
“We like the rewards and certificates; our children work very hard to receive these! The reports are also brilliant in keeping us informed of the levels our children have reached and where they need extra help.”
Parent, Coolah, NSW, Australia
“My students are improving by the day, and some even stay in for recess to work on IXL!”
Helm Jackson, 5th grade teacher, Redmond, Washington, U.S.A
- Electric Field
- Electromagnetic Field
- Energy Quantization
- Equilibrium of Forces
- Gas Laws
- Gravitational Field
- Heat Energy
- Magnetic Field
- Radioactivity: Decay Constant
- Simple A.C. Circuit
- Resultant of Two Vectors
- Wave - Particle Behaviour
- Work, Energy and Power
This app solves physics problems for you and it shows you how it does it.You don't have to deal with the formulas and to do any calculations. The app has a list of topics that it can handle. You click on the topic of your problem, and that starts a chat. The app asks you questions about the givens of the problem and what you have to find out (the targets). It then displays the solution and the details of the derivation. It also converts the units of the givens and the results (if you want to).
PROBLEM: A rock is tossed straight up at 50 feet per second. How much time will it take to reach a point 4 meters above its starting point? (Neglect air resistance.)
How it works:
You browse the table of contents (screenshot 1, above). Topic 2.2 (Free Fall One Segment) matches the situation of the problem. You click on it, and the chat starts.
Screenshot 2 is a record of the chat. Your answers are shown in the right end of the boxes.
Screenshot 3 displays the givens and the solutions (the targets and other things that the app could calculate.) It also shows a conversion that you wanted to do.
Screenshot 4 displays the details of the derivation.
This innovative app was prepared by a veteran physics professor and an experienced computer scientists. Its aim is to help students of algebra-trig based introductory physics. It simulates and illustrates how physicists solve problems.
It is expected that by participating in such chats, students should pick up what type of questions physicists ask themselves as they solve physics problems. Quite often, knowing what to ask is half of the solution. This skill can be used also for any physics topics.
With this app's help you'll be able to understand how to solve Physics 1 and 2 problems, like those that are given at the end of chapters in most General Physics textbooks. By going over the details of the solutions you'll develop insights about the meanings of the formulas and how they are used.
This app is helpful when:
1. You solved a problem and you want to check your solution.
2. You know how to solve the problem in principle, but you want someone else to go through the chores (a physics problems calculator).
3. You want to observe how an expert solves physics problems, and learn from these examples.
4. You just want the problem solved.
Q: Can the app solve any possible “end of chapter” problem for a situation listed in the table of contents?
A: In tests, the app has successfully solved thousands of “end of chapter” problems. It should solve any problem whose variables are directly linked to the symbols of the formulas that it uses.
In some cases, some pre-processing by the user is needed. For example, if a formula uses area as one of its variables, and the given is the radius of a circle, the user will have to calculate the area and provide it to the app.
Also, in complex problems that are combinations of more basic ones, the user will have to dissect the complex problem into basic ones, and the app should be able to solve them one by one.
Physics is sophisticated, programming is intricate, and mistakes happen. So, ALWAYS check the solutions provided by this app, before using them.
TOPICS HANDLED BY THE APP
Motion at Constant Velocity in One Dimension
1.1 One Moving Object
1.2 Two Objects Moving at constant velocities on the Same Line
Accelerated Motion in One Dimension
2.1 One Object Moving in Constant Acceleration
2.2 Free Fall; One Segment
2.3 Free Fall; Two Segments
Accelerated Motion in Two Dimensions
3.1 Projectile Motion
4.1 General Forces Act on an Object
4.2 Object on a Plane, Friction Force
5.1 Conservation of Momentum
5.2 Impulse and Momentum
6.1 Conservation of Energy
Energy and Momentum
7.1 Ballistic Pendulum (generalized)
Elasticity and Oscillations
8.1 Elastic Properties of Static and Oscillating Objects
Please read the Equation format specified in help before attempting to solve complex non-linear equations.
The free version of the app can be found at
This App is ad supported.
★ Application areas: Some of the applications areas are:
Physics and sciences
Finance and Economics
★ Who should buy this app?
★ Why buy this app?
- Solves differential equation in quick time
- Reduces time in calculations.
- Reduces effort and time in research.
★ Tips and Notes:
- It is always recommended that the user’s uses as smaller difference in final and initial X as possible to get “Higher accuracy” and “Better Resolution in Plot”. This can be done using the step process as described below.
- For example to find value of Y at 10 with initial value of X as 0 and Y as 0 for dY/dX=Cos(X)*Sin(X). To get higher accurate results split the range of 10 into 2 “steps” (0 to 5 and 5 to 10). For first step, enter the function and initial value of X as 0 and Y as 0 and final value of X as 5. Click “Calculate” to find value of Y at X=5 as “0.45976788”. Now for second step, enter the function and initial value of X as 5 and Y as 0.45976788 and final value of X as 10. Click “Calculate” to find value of Y at X=5 as “0.14979482”.
- When the app returns a “NaN”, either the (i) Y value doesn’t exist at the final X or (ii) range is too large, try reducing the difference in initial and final X and use the step process described above (this is especially needed for functions with large curvature like tan and log).
- Based on capability and limitations of Android system the maximum difference in initial and final X for “Calculate” and “Plot” as fixed as “50” and “30” respectively. For Y at a range greater than 30, use the step process described above. (For larger ranger of 400 and 100 for calculation and plotting, Please try Paid App)
★ Have Suggestions or Issues?
Email firstname.lastname@example.org and you'll get a prompt response.
*'Math for the brain' will enhance your math skills and keep your brain sharper and smarter, while providing you with insightful brain facts. This application is fun and challenging for people of all ages.
**VOTED ONE OF THE TOP 5 EDUCATIONAL APPS BY REVISION UNIVERSE**
All parts of the body need a work out from time to time to keep them in top shape. This includes the vital part of all the brain.
By using Math for the brain for that essential brain work out you can improve your skills in mathematics. It provides many math problems to solve, which helps keep you smarter and make your brain youthful. This is far better and much more fun than the school math problems that we all dreaded.
This app makes those math problems to be more fun and challenging and once you get started you may find it hard to put down. There is the whole range of mathematics at your finger tips, addition, subtraction, multiplication, division, powers and percentages.
This app is suited for those of all ages from kids wanting to get a little practice in and to hone those mathematics skills, to adults that want to improve their skills too. There are even multiplayer options too which gives you the ultimate challenge. This could really help anyone’s mental arithmetic.
So, whether you are looking for an interesting challenge or need to sharpen your brain this app is perfect. Because you have it on your smart phone you could challenge yourself and others anywhere.
Tags: addition, subtraction, multiplication, division, exponents, brain, cool, division, mental practicing, game, kids, mathematics, facts, challenge, flash cards practice, multiplayer, workouts, mathforthebrain
Types of Math problems and Algebra equations it can solve:
- Simple Quadratic equations >>> e.g. x^2 + 5x + 6 = 0
- Simple Linear equations >>> e.g. 2x + 6 = 22
- Some complex Quadratic equations >>>> e.g. x^2 + 2x + 4x – 5 + 11 = -x
- Applying PEMDAS >>> e.g. 2 + 4/8 * 3 - 2
- Find GCF, LFM
- Work with Fractions
Future release plans (the app doesn’t solve these yet!):
- Solve complex Quadratic equations >>>> e.g. x^2 + 2x + 4x – 5 + 11 = -x
- Solve complex Linear equations >>>> e.g. (2x + 5)/(x - 4) = 4x + 3
- Solve problems involving decimal points >>>> e.g. 2.5 * 4.6 + 2/4
- Solve Geometry questions
Its fun to learn Algebra with its very easy to understand Algebra learning resources. It covers these Algebra topics:
------- What is a Polynomial?
------- Adding and Subtracting Polynomials
------- Multiplying and Dividing Polynomials
------- Rational Expressions
------- Conjugates and Rationalizing the Denominator
------- Special Binomial Products
Introduction to Algebra
------- One step Equations
------- Two step Equations
------- Algebraic Multiplication
------- Order of Operations - PEMDAS
------- Solving by Substitution
------- Linear Inequalities
------- What is Exponent?
------- Negative Exponents
------- Reciprocal of Numbers and Variables
------- Squares and Square roots
------- Fractional Exponents
------- Laws of Exponents
------- Multiplying and Dividing Variables with Exponents
Simplifying Algebraic Expressions
------- Expanding and FOIL method
------- Multiplying Signed Numbers
------- Commutative, Associative and Distributive Laws
------- Cross Multiply
------- Adding, Subtracting, Multiplying and Dividing Fractions
------- Equation of a Straight Line
------- Coordinates and Quadrants
------- What is a Quadratic Equation?
------- Solving by Factoring
------- Completing the Square
------- Solving using Quadratic Formula
Have any feedback, facing any issues, or see a wrong answer? Send us feedback on: www.iKaes.com/feedback.html or support@iKaes.com
We constantly review and act upon user feedback, and update our App to increase customer satisfaction.
Also visit us at www.iKaes.com
It saves you the trouble of opening a browser and waiting for the page to load just to see your attendance.
- You only have to enter your credentials once, making your life easier
- Clean easy to use UI
- Allows temporary logins (for those times when your friends want to check their attendance on your phone)
temporary logins will not mess with your saved credentials.
- Absent Details, by day, and subject
Feel free to email me about bugs/feature requests
If you encounter a "Force Close" (Hopefully you don't) please hit report. That would be helpful in solving the problem.