Topic Tuesday #54 2013/07/30 - "Cruel Calculus"

Topic Tuesday #54 2013/07/30 - "Cruel Calculus"

"One death is a tragedy; one million is a statistic." - Joseph Stalin 

Researchers were curious about generosity in the way of donations to charitable causes. 

There would seem to be a correlation to the level of generosity when it has a face; a face reflecting the suffering. You may have heard that sometimes you "have to put a face to name" to make it matter. It turns out to be very true. John and Jane Doe see a plea for a donation to save needy children. The plea wants money to help save children by providing general life saving things: medicine, food, clean water, shelter, maybe even education, if there is enough left over. Save more with a higher donation. It's simple math really, and we have seen it in the big box stores when we stock up on items. Buy bulk, pay less per item.  It works that way with helping people too. The more money is donated, the more people are saved. So it would figure, by that reasoning, that if you are told your generous donation of x will save 1,000 children, you would be inclined to save that number. But that is not how our brains work. That 1,000 is a statistic. The numbers somehow make our brains just say "Nope". 

Do you want to save kids? Of course you do. Do you want to save lots of kids? Sure you do. Do you want to save this particular kid that has a picture and a life story and will write you a gratifying letter saying thank you? OH HELL YEAH!

Face recognition. You put their picture next to a pledge amount. If you leave the donation amount up to the common man (or woman of course) you get this approximate distribution.

The breakdown of average voluntary donations results in a counterintuitive way. Sometimes like a tip at a restaurant...

Example:
Save 1,000 children ≈ $20 donation
Save 100 ≈ $20
Save 10 ≈ $25
Save 1 ≈ $50

Save 1 very specific child  ≈ $75

It's the way we are wired, or so the numbers bear out. 

It's cruel calculus. But given that we can easily be manipulated by pictures and possibly made up tales of strife, some organizations may be inclined to use this against you to benefit the other 999 hungry mouths to feed. In this case, I think that is a good idea. What do you think?

Topic Tuesday #50 2013/07/02 - "CHARGE!!!"

Topic Tuesday #50 2013/07/02 - "CHARGE!!!"

CHARGing you batteries is not the easiest thing to do some days. It gets especially difficult when you do something unusual. For instance you may have seen the MIT/Wilson Solar Grill.

This implementation is unique in the way is stores energy, which is certainly different from the way a cell phone or laptop stores power. This configuration (which has not actually been constructed to my knowledge) uses a fresnel lens to magnify and focus the rays of the sun to melt a lithium nitrate substrate. The melted lithium nitrate, due to its phase change reaction, is able to release its thermal energy for longer periods of time and at higher temperatures than other methods up to now. Heat is then redistributed through convection, which allows for outdoor cooking and heating homes. This method is referred to as "latent heat storage".

Obviously this is a unique application that requires a specific set of criteria. This could also be used to provide electric power or boil water for steam applications. 

Peltier element

Remember any time you have a change of temperature you can utilize that to create power as the heat is exchanged and returns to a neutral state. Peltier coolers use power to create heat, which in turn creates a cold side. With an application such as this, derivatives of that technology can turn a heat source, into power. If done creatively, a refrigerator too. 

Batteries, and power sources in general, are complicated things. The design may be simplistic, but usually a power supply is designed to fit an application.  Some things to consider:

Capacity (Amp Hours)

Weight 

Size (Physical Dimensions)

Discharge Rate (Time to Empty at designed load)

Charge Rate (Time to Charge, when under load and not under load)

Charge Cycles (number of charge/discharge cycles before needing to replace)

Operating temperature range (Affects charge and discharge rates. Batteries can catch fire and explode under the "right" circumstances, like being embedded in a cooking appliance like the solar grill)

Architecture of storage media: Lead-acid? NiCd? NiMH? NiZn? AgZN? NaS? Lithium ion? - and so forth.

Longevity and recyclability:

Obviously what the battery is made of has far reaching implications for the ability to recycle them. Lithium is rare, expensive, and in high demand. Lead Acid (car, marine, UPS batteries) are low cost, high weight, and readily recycled into new batteries given the proper facilities.

So, thank your local engineers for building all this stuff we take for granted all the time, and keep the innovation alive by encouraging our youngsters to... play with electricity, fire, water, light... and anything that interests them. Who knows what problem they might solve.

Topic Tuesday #48 2013/06/18 - "The Advocate"

Topic Tuesday #48 2013/06/18 - "The Advocate"

In this world there are uncountable things to be concerned with. Everything from how your laces are tied to what was served at the last White House dinner, that you weren't invited to, could flow across your mind. There are people out there that get really passionate about a few things. These folks raise money, awareness, and a ruckus in the name of their "cause". Sometimes the cause is relatively small, but nonetheless daunting. Other times, the cause is massive. Something so enormous in complexity and nuance you just have to be a little in awe of it. It takes a special person to devote themselves to a cause and rally for its support. Among other things, we call these individuals, Advocates. And we need their voices. When the message is clear and the personality is strong enough, one person can make a difference in anything. They often have stalwart opponents and detractors. Lies and slander are often the tools of the trade. Mudslinging as often as not is used as part and parlance to fundraising and handshaking. Sounds a little like politics doesn't it? It's because it is a lot like politics, and has to be since politicians are just the kinds of people that advocates are up against. Fighting fire with fire and so on.
You know all this already, or at least I hope you do. My point is to raise your awareness to the advocates around the world. take a second look at what they are doing, and why. These people are running full tilt with a plan. Some want to save a small nesting bird, and others want to save the planet. Some want to educate everyone, others just want to make sure no one goes to bed hungry or sick.
Almost universally Advocates for a cause are trying to change something. They see a problem and want to fix it. They advocate to have anyone who will listen help them in their cause.

So, my dear readers; What are you an advocate for? This is where you get to plug your cause and get just a little more exposure. 
Can we fix it?
We can try!