Showing posts with label Science. Show all posts
Showing posts with label Science. Show all posts

Friday, November 11, 2016

Using the sun for power - how it works

With massive rebate programs and tax credits being issued by state and federal governments, using the sun to generate electricity is very popular. So, how does it work?


Generating electricity from the sun is all about converting sunlight into power. Importantly, the process has nothing to do with converting the heat produced by sunlight into energy. This common misconception leads to a lot of confusion regarding solar systems.


The technology behind solar systems is known as photovoltaic technology. Essentially, this technology involves using sunlight to create a chemical reaction. During the chemical reaction, electrons are released from the relevant material and collected by tiny wires. This process creates a direct current of electricity. The electricity is then converted to usable alternating current electricity and stored in a battery or fed into a utility grid system.


Solar platforms use this exact process to produce energy. The arrays are made up of small squares called photovoltaic cells. A collection of these cells forms a single panel and a collection of panels makes up a “solar array.” The size of your array is entirely dependent upon the amount of electricity you want to produce.


The photovoltaic cells in a solar array are where the action happens. The cells are typically made with crystalline silicon under a glass cover. When sunlight hits the crystalline silicon, the material reacts by kicking off electrons. Tiny wires built into the cells collect the electrons in the form of an electrical current. This current is then sent to an inverter, which converts it to usable electricity.


The biggest issue with solar platforms is how efficiently they convert sunlight into electricity. The answer depends on how much you want to spend. Top brands will convert at roughly 15 percent efficiency. Less expensive brands will convert at 5 to 10 percent efficiency. The more efficient the panels, the fewer you will need.


It has become clear that our reliance on fossil fuels is only going to lead to further problems, whether political, environmental or economic. Advancements in solar technology as well as incredible tax breaks and rebates make using the Sun as an energy source a viable solution for you.


Tuesday, November 8, 2016

Basic principles of theory of evolution

Evolution theory teaches that survival is for the fittest living organism.


What is life? What is fit? And what does it mean to survive?


Well, there are many definitions of course. A useful definition, in scientific perspective, is the one that allow us to analyze myriads things with fewest principles. So here they are.


A living organism is a class of objects that share 3 traits.


1. Reproduce. Living organism can make copies.


2. Inherit. Living organism, in the process of reproducing, will inherit traits to the offspring.


3. Mutate. Living organism, in the process of inheriting, will make small mistakes.


That seems like a reasonable definition. If we look most living things around us, like dogs, cats, pigs, birds, fido, virus, etc., they all share those traits.


However, based on those definitions, God is not alive, while computer virus, religious doctrines, ideologies, and ideas are alive.


I don’t think God will mind though. It’s just a definition.


The practical aspect is that we can use evolution theory to explain the sort of humans, cats, dogs, germs, doctrines, ideologies, and ideas that are common nowadays.


Different living organism performs those 3 traits differently. Those living organism that reproduces a lot becomes plenty. Those that reproduced a lot, become common.


That’s the basic of evolution theory.


For example, we see that peacocks tend to have long elaborated tails. From this, we can guess peacocks with long elaborate tail must have made more peachicks. Perhaps, peahen love peacocks with long elaborate tails. It’s true.


Suppose it were true. Then peacocks with longer tails will mate with more peahens. Those happy couples will then produce more peachicks.


Male peachicks will inherit long tails. Female peachicks will inherit preferences for long tail. So, peahens like peacocks with long tail.


It looks like a circular argument. It is. The truth is we don’t really know for sure, at least just from the reasoning, why peacocks have long tail.


However, we do know that traits that lead to gene pool survival through sexual selection tend to be positive feedback.


Those are traits that either enhance gene pool survival through regular means or signal capability to survive on the females. Samples of the former are Cheetah’s speed and men’s wealth. Samples of the latter are peacock’s tail and sport cars.


The more peacocks have longer tail, the more peacocks in the future, will have even longer tails. The more peahens in the future will get turned on by long tail even more.


Now, most males are poor. Does that mean women like the poor? Does being poor serve gene pool survival?


The answer to the first question is no. The answer to the second is, well, sort of due to various unnatural sex laws against consensual sex. It’s tricky.