How is damping saving our lives?

Have you ever believed that, one of the reasons that you are alive is because of Damping?

If 1, my thoughts are same as yours.
If 0, you may agree after reading this blog.

Damping is any effect that tends to reduce the amplitude of Simple Harmonic Motion or any oscillation.

Take a sinusoid (which is a smooth repetitive oscillation) for instance (this can also be thought of as cosine, with a phase difference), the waveform looks like this:

The same waveform, when damped looks like this:

According to Fourier series, complicated periodic functions are written as the sum of simple waves mathematically represented by sines and cosines.

So, almost all the signals in the nature can be approximated to Fourier series.

How is damping saving our lives?
A natural signal, speech. When any person speaks, the speech (which can be represented by Fourier Series) damps after some time. This can be seen from the following speech wave form:

This is the same reason,

• why we cannot hear a person speaking at some long distance. 
• why when a word is uttered, we could hear the word. 

If there's no damping, all the signals of each word will overlap and and we won't be able to hear anything. Apart from this, if the whole signal doesn't damp, then we could hear the speech of the whole world speaking and all the words uttered from the past will never die out.

The end result, it will be an overlap of all the signals from the past, till date.

Apart from this, each speech signal is sample. It is different from the previous one(you can take samples of uttering the same word for life time and it will be different each time). If this doesn't happen, it will be like in some of the lifts, when you open the door, there will be a recorded voice sample saying, "Please close the door!". It becomes irritating on hearing for a long time.

Nature is designed well for the existence, which is very hard to replicate.

Java methods and declared return type

Guess the output:

May seem straight forward to Java Geeks.



I thought this would give compile time error. Later on realized the output is

This is funny

Moral: It is possible for a method to have a declared return type and yet contain no return statements.

Being a Green Programmer

I know:

• You are busy coding.
• You are working on p1.
• Your Manager wants to meet you in 10 minutes and already 1 min is gone reading till here.

For those whose vocation is Programming and you always have the above excuses or hand-cuffs and even then you want to be Eco-Friendly, glance at the titles and pictures. The pictures are dedicated to you.

For all others, I promise it is worth reading and I recommend to follow at least one.

Who is a Green Programmer?

All those people whose job is Ctrl+c, Ctrl+v (I know there is a lot more) and who have already realized that the Beautiful Earth is in danger and are desperate to contribute and follow a set of Eco-friendly rules, are already Green Programmers. The level is based on the number of rules you follow and the number of people you educate. The other synonym is Eco-Friendly Programmers.

Why should I become a Green Programmer?



Global warming, Acid Rain, Pollution, Hazardous waste, Ozone Depletion, etc. These terms are now more practical and live. By becoming a Green programmer, you are first aware of the cause and consequences; and then aware and follow the ways to reduce them.

How to become a Green Programmer?

Apart from following the best practices for programming, there is a simple set of Eco-Friendly practices, which needs a little extra effort. There are a few easy and basic rules defined in this blog and the rest is common sense.

If you have understood till now, you are already a Green Programmer.

Being the Green Programmer:

I asked a question in stackoverflow, "How to be an Eco-friendly programmer?" and I am going to use few of the answers here. For those answers that I got from stackoverflow, Notation is Answer:.

1. Efficient Programming:
   
   
   
   
   
   If you have effective code running in production, you are already contributing to the Environment. Answer: "If your software is widely used, write decent code. Shaving 30 seconds off that image stabilization code saves 30 secs of computer time, every time it is executed (30 secs * 10000 execs/day * 30 days = 104 days of saved computing time). That's far more energy than you'll ever save personally."
   Try to complete all the tasks ahead of the schedule so that you don't have to do over time thus reducing the power consumption.

2. Turn your stuff off:
   
   
   

   
   
   

   In a day, actual work, code, checking mails takes 6-8 hours and most of the systems remain switched on even after that because of
   a short break: coffee break, lunch break, Meeting, long phone calls. In such spans, Just switch off the monitors.
   or a long break: EOD, weekend. In such cases do shut down the machine and switch off the monitor. And for programmers, the desktop is in Schrodinger's cat state most of the time, it is better to hibernate.
   
   
   
   
   This means that if the machines are switched off after use, the power usage is only one-third.
   Apart from these,
   - Turn-off the mp3 players, i-pods, etc when not in use and switch off the lights, AC, fans while leaving.
   - Activate the Eco-functions of your computer, make it turn off the screen after a few minutes and go in stand by after a few more.
   - Use an empty screen saver.

3. Remember Paper Comes from Tree:
   
   
   
   
   
   - Try using e-books, online materials, white boards.
   - Use a ceramic cup instead of paper cups.
   - Hand dryers and kerchiefs are better than paper towels.
   - Don't burn waste papers. Recycle.
   
   For those who work on report generation, Answer:
   "If you write software that generates reports try to:
   - minimize the unused space on a page (use two columns, etc.)
   - remove superfluous information or graphics (fancy headings ...)
   - allow the user to select the wanted information (print only what you need)
   
   This will reduce paper and toner (or ink) usage on the client side. If your client prints a lot of your software's reports, this will save much more paper than you can by cutting down your printer usage."

4. Reuse, Reduce, Recycle:
   
   
   
   
   
   The advantages of reusable code for programmers is obvious.
   - Share the book that you have, let someone reuse it.
   - Share the common print outs.
   - Answer: "Buy an Aeron Chair. Not only because it's 94% recyclable; odds are you'll use it for a time span within which others would go through twenty (all destined for a local land fill). Extra Bonus: they are nice and comfy."
   - Don't upgrade your computer until you really need to. When you finally do, recycle your old computer, sell it, donate, or give it to an organization that disposes of computers responsibly.

5. Telecommute, Cycle and Public Transport:
   
   
   
   
   
   Live close to work, the advantages are obvious. The only disadvantage may be, higher rents. If you are very far away from work place, try using Public Transport. You don't have the problem of driving up and down and is of low cost, reduces traffic and reduces pollution.
   
   - Telecommute whenever possible, Answer: "If you commute by car, work from home a couple of days a week if possible. You'll reduce your carbon output, and save a bit of money, too. I save ~£24 (~$34) a week (£1,248!) on diesel by working from home two days a week; that doesn't include car maintenance costs either. It's not insignificant. Plus, less traffic on the roads means less congestion which means free flowing traffic and thus much more efficient motoring for those who are on the roads."
   - Cycling has one more advantage of Good Health.

Activities:

• Once a week, try using public transport or cycle.
• Discuss on a tea break on the points that you follow and those you are planning to follow.
• Try doing one activity a week and then it becomes a habit.

This is not over. There are a lot more that our common sense tells us everyday. Now what are you waiting for? Join hands with the other Green Programmers, follow and spread the word.

References:

• http://stackoverflow.com/questions/498512/how-to-be-an-eco-friendly-programmer
• http://www.earthday.net/