Tag: Technology

My good friend wanted his trailer to have some metal over the sides of it to use to tie down his riding lawnmowers, his ATV, and his large pull behind mower.  He has several acres to mow, at his farm and here at his house.

Yesterday we went to the hardware store and got supplies, went to his farm to pick up the trailer, and to the welding supply firm to get material.  We welded a little last night, and finished it today.

Welding is almost like art.  One takes a design, and makes it into a fusion of art and utility.  Dad taught me how to weld.

With the news about the horrible failure of the nuclear reactors in Japan, it occurred to me that many people do not really understand how nuclear reactors work.  This is the first part of a short series designed to demystify how nuclear reactors work.

All methods for generation of usable amounts of electricity require some sort of energy source.  In photovoltaic units, the electromagnetic energy in solar (or other) photons is the energy source.  In geothermal plants, the interior heat energy from the earth is used, whilst in wind plants the kinetic energy of moving air is used.  Hydroelectric plants use the kinetic energy of moving water.

Fossil fuel fired plants use the potential energy contained in coal, oil, or gas by converting it to heat by combustion.  Finally, nuclear electricity uses the potential energy of a very few heavy elements’ nuclei that is released as heat in the reactor.

Those of you that read this irregular series know that I am from Hackett, Arkansas, just a mile of so from the Oklahoma border, and just about 10 miles south of the Arkansas River.  It was a redneck sort of place, and just zoom onto my previous posts to understand a bit about it.

I never write about living people except with their express permission, so this installment is about a long dead denizen of Hackett.  This time it is about a teacher of mine, Elwood Brockman.

Mr. Brockman taught high school maths, and was also the grade school principal.  Since the entire school system from grades 1 to 12 (no K at the time), double duty was the norm.

For a firearm to operate, there must be an energy source to impart kinetic energy to the projectile being fired.  This is is true in general, but our discussion shall be limited to small arms with only a couple of exceptions.  These materials are called propellants, and the name is quite apt.

The first propellant used was blackpowder, the exact origin of which is lost in antiquity.  For centuries, actually up to very late in the 19th century, blackpowder was the only propellant available.

In the late 1880s what is now called smokeless powder was developed, and has replaced blackpowder in almost all applications except for what I refer to as “boutique” ones.  A substitute for blackpowder, Pyrodex(R) was developed , along with some other substitutes for reasons that will become apparent later.

Hydraulic fracturing, also called hydrofracture or just fracking, is a commonly used method to increase the yield of fluid raw materials, usually petroleum or natural gas, from formations that are not “easy” extraction targets.  Easy targets are ones that the fluids dispersed in sands or very porous rock formation.  

Let us dispel a common myth right now:  oil and gas is almost NEVER found as big pools of those materials in large holes in the rock.  Almost without exception, and perhaps quite without exception, these materials are dispersed in some more or less porous rock or sand.    When you see pictures of underground reservoirs of gas or oil, you are really looking at the fluid as it is dispersed in the native matrix.

Sand and very “rotten” sandstone are easy matrices from which to extract the fluids.  Shale and hard sandstone are much more difficult matrices, and hydraulic fracturing is used to increase yields from such formations.

Anterior poliomyelitis, mainly called polio (the old name was infantile paralysis) was a scourge for centuries, but was not recognized as a specific disease until comparatively recently.  This piece is in honor of the huge immunization program that was begun 56 years ago last week in the United States, that fact kindly pointed out by our good friend ek hornbeck at TheStarsHollowGazette.com a couple of days ago.

Most people do not know anyone who was infected with the paralytic form of this disease these days, partly because they either died or got better, but mostly because of the most successful vaccination program against an infectious disease ever attempted.  I have first hand experience with two cases, and will turn 54 on this coming Wednesday.  Few people younger than about my age will have known anyone who had it.

Everyone is familiar with phase transitions even it they are not familiar with the term.  Amongst the most familiar is the melting of ice and the boiling of water to form steam.  Technically, these transitions are called fusion and vaporization, respectively.  There are more and we shall discuss some of them later.

All phase transitions are accompanied by changes in the free energy of the substance undergoing the transition, and this free energy has two components, the enthalpy of the transition and the entropy of the transition.  Unless very careful work is being done, the entropy change is often ignored because it, in many cases, is the lesser contributor.  However, it is never zero (except at absolute zero) and sometimes is the dominant factor.

I was astonished at the response for the first installment for this series, and so decided that instead of just a couple of survey pieces, reader interest justifies a bit longer treatment, getting more into the weeds. Thus, I have come up with a bit more structured series.

Unlike rifled firearms like pistols and rifles, shotguns are smoothbore weapons. That is, they have no rifling to impart spin to stabilize the projectile, in the case of shotguns usually multiple projectiles. Shotguns are a relatively recent development in their current form, but the concept of firing more than one projectile at a time goes back a very long time.

Modern shotguns are designed to fire a relatively large diameter cartridge as opposed to rifles and pistols. In addition, a different system is used to state the diameter of the cartridge in most cases.

Happy New Year to everyone!  I hope that 2011 will find you well and prosperous.  Last week we began to examine the so called Rare Earth Elements, which turn out to have lots of uses, many of them to do, oddly, with optics in diverse ways.  This week we shall finish up the series about them.

I reluctantly admit that I did not take as much time as necessary for the piece last week, mostly because even I did not understand just how important these elements are, both from a modern technological standpoint and also from an historical one for chemistry becoming a modern, “hard”, science.  First we shall look into some history, then finish up the elements themselves.

Welcome to the third to last xx/xx/xx year in our lifetimes  Only next year and 2012 until we wait another 88 years for one.

Now that I have gotten your attention, actually MOST plastic bottles are not evil from a health and safety perspective, but the way that we use them certainly is evil.  I did say MOST, since by far the greatest number of plastic containers are made of polyethylene (PE, recycle code 2), polypropylene (PP, recycle code 5), or polyethylene terephthalate, (PET or PETE, recycle code 1).  These materials are not very apt to leach harmful materials into the contents.

Some plastics, notably polycarbonate (PC, recycle code 7 [7 is a catch all for “other”]) are apt to leach out harmful materials, particularly bisphenol A, strongly suspected as being an endocrine system disruptor because of its potential to mimic estrogen.  Polycarbonate containers are clear and usually thick, while PE and PP are translucent.  PETE is also clear, but usually quite a bit thinner than PC.  Just look at the recycle codes on the bottom.