Graphite is classified as a mineral. It is an allotrope of carbon that has many uses in technology. Perhaps the most common use of graphite is in pencils where it is often mistakenly called ‘lead’. Graphite is in a layered planar structure that makes it useful as a material from which to make writing equipment. Graphite is also a semimetal and an electrical conductor. It is these characteristics that make carbon very important for the world of technology.
EDM or electrical discharge machining has revolutionized the auto industry and the aerospace industry. This process uses graphite rods. EDM is also called sink erosion or wire erosion. It is based on the principle that a high voltage run between two electrodes will cause a spark if the distance between the two electrodes is short enough. The spark causes a small amount of particles to be removed from each electrode. Sparks occur many times per second. The result is that the sparks can be directed as a cutting instrument. Traditional milling and sawing struggles with hardened steel and other very hard metals and alloys. EDM overcomes this problem and allows for an accuracy in machining that was hitherto impossible to find.
Sink erosion machines can be fixed to robots and computers to make cut any shape – 2D or 3D – into hard metals. It makes for perfect machining of turbine blades, turbine holders, car chassis, rocket parts etc. Without graphite electrode technology and EDM in particularly it is unlikely that man would have got to the moon.
Expanded graphite is also used in laptop production. Expanded graphite is made into a foil that is used as a heat sink for laptops. It is estimated that 7,500 tons of expanded graphite is used in the USA for this purpose a year.
Finally, carbon brushes are used as commutators allowing engines to spin through 360 degrees. This makes carbon commutators made of graphite fundamental to the auto industry.
That stuff in your pencil is more important than you might have realized.
Technology has transformed our lives today from the times of our grandparents. Just imagine what sort of things our grandchildren will be able to enjoy when they reach adulthood. Technology is truly marvelous. One of the most popular items available today are handheld readers and tablets. We’ve all heard of the Amazon Kindle and Apple iPad. These portable electronic devices are transforming the way we enjoy our leisure time. I don’t have an iPad myself – although two other family members do! But I do have an Amazon Kindle reader so I want to look at some of the reasons why my may or may not want to get your hands on one of these devices. The new Kindle 4 will be released in 2011 so it is surely an exciting time to be considering one of these portable hand held readers.
My 3 Reasons to Buy a Kindle
Portability & Use
These are just three of the reasons that I love reading this way. I’m not even going to talk about the technology today. You can find lots of information about the product specification all over then internet so I just want to mention three of the benefits that I have noticed personally.
1. Free Books: Perhaps you don’t believe me when I say this – but I’ve read so many books over the last year and hardly paid for any of them. This is because Amazon have what they call their Out of Copyright Collection. These books can be downloaded to your Kindle for free = $0!
Now, it’s not like we can get current best sellers for free. Although there are hundreds of thousands of olden classics on the list that we can get. This feature alone makes the Kindle reader amazing value!
2. Portability & Use: I could have split this into two sections but shall deal with them together. What I really love is that I can go for nearly a month between charging my Kindle. It starts to give you a warning that the battery is running down at least an hour before it dies. So I hardly ever actually run out of charge so that I can’t read.
It’s so lightweight that travelling (or just carrying it around is easy). It weighs about the same as a small paperback – but inside I can have 100s of books! The Kindle dictionary is so easy to use – it makes looking up words on the fly a joy.
3. Cheaper books: This is not the case all the time – in fact sometimes it is actually more expensive to buy a Kindle book than the regular one. Particularly for books that are only available as hardback or Kindle version – I have found that the Kindle version is ususally the cheaper of the two. For me, I am saving lots of money simply through investing in the handset.
If you are wondering how to pick a great heat pump, we’ve got some tips for you. These 3 tips will help you select a heat pump that fits your budget, meets your demands for performance and keeps your home comfortable all year.
1. Know the size heat pump you need. This is where it starts. If you get the wrong size heat pump it won’t perform well, even if it’s the top model on the market. An undersized Carrier Infinity heat pump won’t heat or cool your home any better than an undersized Payne budget heat pump. Have an HVAC pro do a load calculation to determine the right capacity heat pump you need, along with an air handler that is adequate to handle the demand.
2. Choose the performance level you want. As you read heat pump reviews and spec sheets you’ll discover differences in what they offer. Some are single-stage models, meaning they are either on full blast or they are off. Two-stage heat pumps offer low and high mode operation. They run on low most of the time to keep indoor temperatures consistently cool and only kick into high gear when you boost the cooling with the thermostat or temperatures rise outside. Running on low is quieter. It also removes more humidity from your home, making it more comfortable. Match a 2-stage heat pump with a variable-speed blower for maximum performance.
3. Think about hybrid heat. Some heat pump models can be included in dual fuel systems along with a gas furnace. The heat pump is used in cool weather, but when temperatures get very cold, the gas furnace is programmed to take over. Dual fuel heat pumps are essential in cold climates because heat pumps aren’t effective in weather that is below freezing. But even in milder climates, where nighttime lows are in the 40’s, a hybrid heat system might be a good choice too. It gives you the option of electric or gas heat based on current energy prices.
Two-stage heat pumps and those with communicating technology that coordinates them more precisely with the air handler will cost more. Some brands will also cost more than others, but the increased price isn’t always justified by quality or durability. Finding impartial heat pump reviews will help you find the highest-quality heat pumps and the one that will work the best for you, regardless of brand.
Do your homework ahead of time and be sure to get the size of the heat pump and system right. Since a heat pump is designed to last 15-20 years, taking the time to get the right one is essential for your long-term satisfaction with it.
All Amazon hand held reader owners should know how to use the built in Kindle dictionary feature. This is what we shall be talking about today. In just a matter of seconds, you can quickly pull up a definition for any word that you come across in the text that you are reading. So using a Kindle, it is much more likely that we will use this dictionary function than look up a real dictionary if we are reading a “proper” book. The simple reason for this is the low hassle factor and speed of the Kindle dictionary system.
There are just 2 buttons that you need to know about to use this feature.
5 way directional controller
Following are the steps that you have to go through to use look up a word using your Kindle dictionary. It is very simple and only takes a few seconds.
As you are reading a book, you may well discover a word whose meaning you are not 100% clear on. When this happens, it would be a perfect time to look up a definition with the built in dictionary feature. You simply have to use the 5 way directional button to move the flashing cursor to the beginning of the word that you want to query. Once you have done this, at either the top or the bottom of the screen you will get a short, two line definition of the word. If this is enough for you, simply carry on reading your book.
However, if you would like a more detailed description of the word, you should press the center button of the 5 way controller. This will take you to another screen will a fuller explanation of the word that you are querying. Then to return to the book you were reading, simply push the Back button once.