Monday, September 3, 2007

A Brief History Of The Radio

It is expect that nearly every household in the United States has at least one radio. The invention of the radio was dependent upon two previous discoveries: the electromagnet and telegraph.

The electromagnet was discovered in 1825. This discovery opened the doors to global communication! Five years later, Joseph Henry successfully transmitted an electric current via wire which was stretched over a mile and which caused an electromagnet to trigger the sounding of a bell. Thus, the electric telegraph was born. One of the most recognizable names associated with the telegraph is Samuel Morse who is most notable for the series of dots (brief sound) and dashes (more sustained sound) which was used to transmit messages by alphabet code (thus known as Morse Code). Telegraph became the sole means of rapid long distance communication until 1877 and the invention of the telephone.

Batteries are interesting, aren`t they Used by the general consumer, they are small, but powerfully packed instruments which produce power used for many cameras, alarm clocks, radios, and other devices. What makes this power production possible In the case of the telephone and it`s early design and use, batteries produced the essential source of power for the electromagnet.

Batteries have two ends to which one is assigned a `+` or positive, and the other a `-` or negative. When a battery operated device is switched on, the electrons which are produced by the batteries, quickly move from the negative side to the positive side of the batteries. Something was needed to interrupt this rapid flow of electrons or find the batteries totally expended in a brief time. In order to accomplish this, a wire is often inserted between the positive and negative terminals and a `load`, such as a radio, creating a small magnetic field in the wire. The electromagnetic waves which are present now, have the capability to transmit sounds (speech, music, and so on) as well as visual images undetected by sight through the air.

There are several scientists who must be mentioned as essential to the telephone as it is known to most of us. Mahlon Loomis created wireless telegraph. Guglielmo Marconi, proved the possibility of radio communication. In 1985 Marconi, transmitted and received a radio signal. Using the Morse alphabet, he sent the first wireless signal which was transmitted across the English Channel and in due time, he was able to receive the Morse letter S which began in England and reached Newfoundland which became the beginning of transatlantic radiotelegraphy (1902).

Wireless signals gained far reaching use as a means of communication for rescue work when an accident or disaster occurred at sea. In 1899 the United States Army began utilize wireless communication which originated from a lightship off Fire Island. The US Navy was about two years behind the Army in utilizing wireless telegraphy.

In 1903, President Roosevelt (Theodore) and King Edward VII communicated via this new and improving technology. The well known Robert Perry, using radiotelegraphy, conveyed the message that he had `found the Pole`.

The first AM radio entered the world of telecommunication in the early 1900`s. This device made the use of somewhat weak waves possible for communication. This was the time when the term `radio`, as we know today for radio devices, began to be used.

It is believed that in December 23, 1900, professor Reginald Aubrey Fessenden was the first person to successfully transmit human voice by radio waves. By 1915, speech was first sent across the United States beginning in New York City and sent to San Francisco. Somewhat later, transmission occurred across the Atlantic Ocean from Arlington, Virginia, to Paris at the Eiffel Tower.

It is truly fascinating all the scientists and the physics theories that led to the invention of the radio. Marconi, Alexander Popov, Oliver Lodge, Fessenden and many others, have all made important contributions to an invention that made the world so different, that most likely none of them would envision. The radio era was born.

This article is under GNU FDL license and can be distributed without any previous authorization from the author. However the author's name and all the URLs (links) mentioned in the article and biography must be kept.


http://www.articleco.com/Article/A-Brief-History-Of-The-Radio/50842

Home Theater Design: Where to Place Your Speaker System

Whether investing a large amount of your savings or a small part of your budget on your home theater, your speaker placement will play a big role in the sound quality and sonic performance in your home theater room.

The instructions that come with your speakers will give you recommendation for where to place them within a room but below are a few things to consider as you begin setting up your new home theater speakers.

CENTER CHANNEL SPEAKER
This speakers main purpose is to anchor sounds on-screen, like dialogue.

Tips for placement of the center channel speaker:
1. Center it directly above or below your television.
2. If you place it above the television, the front edge of the speaker should line up precisely with the front edge of the television. This will cut down on any kind of sound bouncing around inside the television cabinet.
3. The tweeter of this particular speaker should be at the same height as the tweeters of the front speakers. If you can accomplish this to within 24 inches, that will allow for the best sound quality.
4. The front speakers and this particular speaker should be spaced the same distance away from your planned listening position.

FRONT SPEAKERS: BOTH LEFT AND RIGHT
These speakers have two distinct purposes. They reproduce stereo music sound while also handling a movies soundtrack.

Tips for placement of the front speakers:
1. Find your optimal listening position. Now space the two front speakers at points in the room that are equal is distance to that position, with one to the left and one to the right. The front right, front left and center channel speakers should all be approximately the same distance from where you are sitting, with the tweeters of each directed at your ears. Dont just eyeball this and get an approximate distance, as even an inch variation in the distance of the speakers can make a noticeable difference in your home audio systems sound quality.
2. These speakers tweeters should be even to your ear level when seated in the optimal listening position. Smaller home theater speakers can be mounted on the wall or placed on a speaker stand. Floor standing speakers normally have this covered in their design.

SURROUND SPEAKERS
The purpose of the surround speakers is to provide low and high level sound from other parts of the room, creating a movie theater feel in your home theater. The surround speaker placement will depend on the size of your home theater, the shape of the room, and the space needed for the actual speakers. Be creative and experiment with the placement of these particular speakers throughout the room.

Tips for placement of the surround speakers:
1. Place the primary pair to the right and to the left of your optimal listening position. This can be done in line with your position or just behind it. When placement to the side is impossible, or when you have a surround system with more than two surround speakers, you may wish to place the speakers behind the listening position, with the sound being directed toward the front of the room.
2. These speakers should be placed at approximately ear level when you are in a standing position.
3. Experiment with the aiming of these speakers when mounted on the walls. Sometimes good results can be achieved when you point them up at the ceiling or back at the rear corners of the room.

SUBWOOFER
A home theater subwoofer provides your home audio system with all the low bass frequencies needed for a movie theater, surround sound experience. However, it is one of the least difficult to position. In most cases, you can position your home theater subwoofer anywhere in your home theater and still get good results.

There is no one perfect placement for any given home theater speaker. No two rooms acoustics will be the same, all speakers will have various sonic characteristics, and no two ears will hear any given sound identically. This doesnt mean you will never achieve the best sound quality from your home audio system. All it means is take the advice given and modify it when you actually install your home theater speakers to accommodate your specific needs.


http://www.articleco.com/Article/Home-Theater-Design--Where-to-Place-Your-Speaker-System/54030

Choosing a Home Theater DVD Player for your Home Theater

With all the new developments in audio-visual equipment on the market, it is hard to keep up with it all. However, there are some basics you should be aware of when looking for certain items, like your home theater DVD player.

The first question you may be asking is Why do I need DVDs and a DVD player at all My VHS works just fine. Well, the reasons are many. A home theater DVD:
- has a much sharper and clearer picture than video cassettes
- has superior sound quality to any VHS tape
- is less prone to having background noise
- allows you to see movies in wide screen or full screen
- allows you to watch movies in multiple languages or with subtitles
- has extras, like bloopers, movie trailers and sometimes interviews
- can be used as a CD player as well (make sure it is CDR/CDRW compatible)

Once youve decide to purchase a home theater DVD player, you will need to educate yourself on what type of player you need for your specific home theater system. What follows will give you an outline of what to look for when you go to purchase your new player.

Here are some things you should look for in a quality DVD player:

AUDIO OUTPUTS
Every home theater DVD will have analog stereo outputs. This just means that it has the capability of being hooked into any two-channel amplifier.

However, with the increased use of Dolby Digital Surround Sound, many of the newest, most cutting edge players will have six extra audio outputs. This will allow for the decoded 5.1 signal associated with Dolby Digital.

There are a couple of ways that the audio signal can get to your home theater receiver. Most have a digital connection, which can be accomplished through a coaxial or an optical connection. Your newest home theater DVD players and receivers oftentimes have both connections, but it never hurts to look and make sure you are getting just what you need.

VIDEO OUTPUTS
Most home theater DVD players have several video output connections that you can choose from. The one most commonly found is composite output. Most of the televisions available today have composite input and are therefore compatible with such a player.

If you are looking for a better picture, be sure to look for a television and DVD player with S-Video. This is considered a step up from composite. If you are using a television you currently own with your new DVD player and it has S-Video, be sure to use this connection.

There are two higher quality outputs available: component and rgb. If you are buying a whole home theater system all at once, including a home theater DVD player and possibly a home theater LCD flat panel television, you will want to look for equipment that will be compatible and work together as an audio-visual unit. Look for outputs on the player and inputs on the television.

ZONING CONSIDERATIONS
The entire world is divided into zones. The US can be found in zone 1, the UK can be found is zone 2, Southeast and East Asia can be found in zone 3, etc. Not all DVDs purchased can be played on all home theater DVD players, if you get one created for a specific zone.

When buying a new home DVD theater system, what you should look carefully for is a player that will play movies from any zone. Most on the market today have been modified so that they will play any and all DVDs, not matter what zone they were created for.

The actual sound and picture quality between DVD players can vary. Visit a local audio video retailer to listen and view the quality and features of the players available. It is also a good idea to read product reviews for various models of home theater DVD players before you buy, to see which brands and models are getting the better ratings and why.

All DVD players are not the same but the ultimate result is a dynamic, exciting new feature to your home theater system.


http://www.articleco.com/Article/Choosing-a-Home-Theater-DVD-Player-for-your-Home-Theater/54052

Saturday, September 1, 2007

Benefits of Ezines

Online magazines or ezines were created to reach many viewers. Like the conventional magazines, ezines contain a lot of information regarding various topics. They are also sometimes called webzine or cyberzine. Ezines, just like any other magazines, are updated weekly or monthly.

Brief History of Ezine

Before, ezines were distributed through CD-ROMs and electronic mails to subscribers. But with the advancement of technology especially the Internet, most ezine owners now have their own websites where they can publish new information and update them regularly. They need only to post their updates or make use of emails to inform their subscribers of their updates.

Ezines and Profits

For webmasters, having their own ezines can greatly increase traffic, and with traffic comes profit, but the profit comes not from the sales of their products and services but from the advertising space that they can sell. Before you reap your benefits of selling the advertising spaces though, you have to make sure that you attract the right visitors. And how can you do this - by posting only the content that are relevant and of god quality.

Because people are in need of information, Internet users find ezine helpful in their search for such as the information are listed categorically, making it easier for them. This need will not likely lessen as the Internet is only just beginning to be noticed as a great business venture, and the more popular your ezine is, the more traffic it gets and the more potential websites owners will want to post their ads in your ezine. But never forget that the best ezine should only contain quality contents as your visitors are not looking for rubbish contents. They need relevant information, not garbage ones.

Having a trusted ezine gives you loyal subscribers and visitors. Like stated above, this trust will be yours only if you provide quality contents that are updated regularly. If your subscribers and visitors see how you provide them these, your credibility and trustworthiness increases.

Maintaining Your Ezine

Having an ezine is not a simple task. Aside from having to choose only quality contents, you also have to update your ezine regularly.

Writing quality articles is not an easy job. It should be done by those who have interest in it, so if you are the one writing for your ezine, be ready to write about a lot of relevant and interesting topics.

For your mailing list, you can utilize the services of a third party to maintain your mailing list for you. Just make sure that you choose only the reliable one.


http://www.workoninternet.com/article_16421.html

Subscribe to usSo You Want To Become A DayTrader(Or Not?)

During the heady .com days prior to 2001, (when Bush became president,) there were stocks, 3 or 4 times a week that went up from 30 to 200% a day.

It was possible, if you knew what you were doing, to check before the market opened to see which stocks were running in real time and why.

And, if you then had a fast electronic brokerage system you could dive into the market, buy a bunch and sell them the same day.

About 1% of people doing this consistently made money.

I saw one private individual make a million in one day shorting Corel. And then there was somebody who lost a bunch hanging on too long to the WWWF IPO.


As a matter of fact the bottom line is that if you take inflation into account you'd have been better off putting your money in an old sock since 2001.

So what to do?

Give up on the Stock Market let alone give up on DayTrading?

Don't give up on the Stock Market, if you use the right system which is a simple set of formulas you can still make 30% or more on your money annually.

Using this simple system $11,000 left in the market for 17 years would be worth more than one million dollars today.

But it is not DayTrading and you still would need a strong stomach to sit out these 17 years, because some of those years would give you negative returns.

The bottom line is this; if you want to DayTrade there is only one way to do this today.

And that is with MINDBLOWING News.

MINDBLOWING News along the lines of:

XYZ corporation finds cure for cancer. ABC Inc invents Eternal Life Pill DreamCar Corp invents car that runs on water.

You get the idea.

And then I am going to use another qualifier:

You should get this news BEFORE most other people get it.

How to do this:

For about $10 a month you can get a subscription to real-time market news.

Get your Real Time Market News at about 6 AM Eastern Standard Time.

Say you find the real time news that a company has invented a car that runs on water.

Check the time the news was first released, making sure that news item was not available yesterday.

Buy the stock now with money that you can afford to burn ALWAYS USING A STOP LOSS.

Most electronic brokerage firms today allow you to buy stocks on NASDAQ only as early as 6 AM EST.

Sell the stock at 9.28 AM EST to all the traders that are waking up.

You could conceivably double your money.

So would you then trade again in this stock after the market opens officially?

No,I would not.

Too many mindgames will be played by market makers during the first day with the stock that produced the mindblowing news.

Remember the statement above:

"There have been very few days since 2001 that any stocks actually went up more than 30% in one day, the oomph has disappeared from both the Nasdaq and the Dow."

Never hold the mind blowing news stock overnight, because people in most cases will dump it on the second day.

One more tip:

Never buy IPO's on the first day.

The most touted IPO(meaning almost all large brokerage houses were praising this IPO to the sky) cost people the most in decreased value on the second day after the IPO came out.

Who were the winners? The brokerage houses.

So, if you have money to burn, have a cast iron stomach and want to watch market news from 6 AM to 9.28 AM EST, DayTrading may be for you.


http://www.workoninternet.com/article_8097.html

How to Trade E-currency

When referring to e-currency, most people immediately think of the FOREX market. The truth is there is a new form of currency trading that is sweeping across the internet and making millions of people wealthy. What is this new wave of e-currency trading that’s hitting the internet you might ask? It’s called the e-currency exchange program. Electronic currencies such as INTgold, Netpay and E-gold are traded daily.

Let’s talk about how the e-currency exchange network can put money into your pocket. There are two ways to make money. The first way is with a portfolio and the second is with a console. Upon opening an e-currency account, the user will be asked to create a portfolio and fund their portfolio. This investment can be anywhere from $25 to $100,000. I would recommend a small amount until you become familiar with e-currency trading. The portfolio is compounded daily and receives gains anywhere from .3% to .5% each day. For example, if you funded your portfolio with a $10,000 investment, each day your portfolio would net $30 of profit. Over the course of one month a $10,000 portfolio would make $900. With these profits you can either reinvest into your portfolio to maximize your profits, or out-exchange the money to your bank account.

The second way to make money is through what is known as a console. Having a console is like having a separate account in addition to your portfolio. With this account you can now process transactions from one e-currency to another for other traders. Not everyone is able to own a console. In order to have a console you must be in the system for 90 days and have a portfolio value of at least $5,000. It may seem like a lot, but even if you started out with only a few hundred dollars as your initial investment, this level can be easily obtained in just a few short months. In order to process transactions, electronic currencies temporarily borrow funds from your console account. In return, the console holders will receive a 6% fee as profit for each transaction they process. For example if Netpay needed to process a $2,000 out-exchange and you temporarily made your funds available for the transaction to take place, you would receive $2,120. That is $120 of profit back into your account! People need transactions processed daily from one e-currency to another and the market just keeps growing.

There are many helpful online courses available on e-currency trading. I tried to learn e-currency trading on my own through forums, chat rooms and by reading articles on the subject matter, but was unsuccessful. This method is extremely slow and time consuming. It took me 2 months before I finally gave in and purchased an online course. After purchasing an online course, I have managed to quadruple my initial investment in a relatively short amount of time.


http://www.workoninternet.com/article_6981.html

The Secrets to Acquiring new Customers

Does your business take green IT seriously? Well it should, because ignoring climate change could cost you money and harm your credibility.

There are now over 1.1 billion computers in operation worldwide, collectively producing about one billion tonnes of CO2 through their electricity requirements. E-waste is serious headache too with computers, mobile phones and electronic gadgets now accounting for 5% of the world's garbage (http://www.unep.org).

But surely small IT companies don't need to be worrying about that kind of thing? Actually, they do - there are solid reasons why all businesses should be going greener, and not just because of the do-gooder's warm fuzzy feelings to be had! Over 70% of PCs will not be recycled when disposed of over the next five years, and globally we will dispose of 512 million. We are now legally obliged to dispose of PC equipment properly, and that normally incurs charges. Thankfully there is a free and simple, if underused, alternative; lots of people in the world are in dire need of our "outdated" computers, so donate them to the likes of http://www.computeraid.org. For safety, I would suggest you scrub your drives first (try dban.sourceforge.net). More regulation info at http://www.netregs.gov.uk.

Perhaps more importantly, consumers and businesses are increasingly taking note of how the products and services they use impact the environment. Memset (http://www.memset.com) became the UK's first "carbon neutral" Web host last Summer and that has definitely helped us win more business, which is also probably why so many other dedicated server hosts are following suit.

Carbon offsetting

Things like travel, electricity usage and product manufacture have a "carbon footprint"; the quantity of greenhouse gases directly or indirectly produced as a result of those activities. Most activities are impossible to make 100% green, but you can offset the effective carbon impact by investing in carbon sequestration projects (eg. planting trees) or in greener power generation facilities (eg. wind farms), thus becoming "carbon neutral".

Organisations like the CarbonNeutral Company (http://www.carbonneutral.com) and the Carbon Trust (http://www.carbontrust.co.uk) can guide you through offsetting, and it is neither expensive nor difficult. For example, an average small office with 10 staff might have equivalent emissions of 20 tonnes CO2/year, which would probably only cost around £200/year to offset.

As well as giving you more credibility in today's increasingly enviro-friendly world, taking a few hours to review your carbon footprint can lead to some worthwhile cost savings as well. A simple example is turning off (or hibernating if, like me, you hate rebooting and getting back to where you were each morning) your PC at night. A recent study by Fujitsu estimated that the UK alone wastes £123m on electricity powering PCs left on out-of-hours. See http://www.energysavingtrust.org.uk for general energy-efficiency tips.

Virtually greener

Carbon offsetting is all good stuff, but when it comes to IT power consumption, prevention is better than cure. Demand for high-availability, centralised server resource is growing relentlessly, and high-density computing uses a lot of energy. Even a base-spec 1U rackmount server will burn 100-200 Watts continuously, and once you fill a few racks and add in cooling requirements you are looking at a whopping electricity bill! With energy prices doubling every few years datacentres' power consumption is fast becoming a major issue for IT business, and is now the main cost underlying server hosting.

The oddity from our perspective is that the vast bulk of servers in our datacentres idle most of the time, with perhaps 90% never getting close to full capacity. While many applications are best hosted on their own dedicated server (better security, for example), few need the full resource of a modern multi-core, gigahertz machine. That is where virtualisation comes in; the latest generation of virtual machines, using the hardware-assisted virtualisation in new AMD and Intel's chips (eg. http://www.vmware.com, http://www.miniserver.com), are operationally indistinguishable from a physical server but use 5-20% of the electricity. The reduced power and hardware costs give you significant savings while not costing anything you actually needed in the first place, and at the same time you are tackling climate change.

It can be argued that all such measures are a dribble in the ocean, and some have serious doubts about the efficacy of our whole approach to climate change. However, being more climate-friendly is not difficult for most IT businesses and almost certainly helps, so can you really afford to ignore the risks, or miss out on the benefits of going greener?

http://www.workoninternet.com/article_17947.html