Wednesday, December 14, 2011

The Dangers of Radio Waves

!9#: The Dangers of Radio Waves

Since the advent of cellphones in the 1990s, communication has become a lot easier and portable. In fact it has become impossible to imagine a world without them. Business transactions have increased exponentially in decision-making now takes place in a much quicker pace. In Africa, cellular technology has become the primary means of communication as telephone companies no longer have to spend billions of dollars building up telecommunication infrastructure.

Radio frequencies and magnetic fields have been controversial topics since the 1960s and 70s, and with the introduction of cellular phones, the controversy has exacerbated. As in every debate, there are two schools of thought surrounding the impact of radio waves and the danger they pose. On the one side, there are those who believe that radio frequencies have little effect on consumers and the environment at large. On the other side, there are those who believe that we are in serious danger from radio waves and the telecommunication companies that dupe us into believing that we are safe.

Radio frequencies or radio waves, as they are more commonly known, are emitted by wireless and other electronic devices. They are not a new occurrence in the modern world. In fact, apart from natural occurrences, radio waves have been around since radio and television. Basically anything that has an antenna or a transmitter emits radio waves. The rate at which the body absorbs radio waves is measured as the Specific Absorption Rate (SAR).

Controversy surrounding cell phone radiation is focused on whether radio frequencies emitted from cellphones are safe for humans and the environment, or whether we are all put at risk by the continuing omission of these waves as well as electromagnetic fields. When radio frequencies are high enough, they can break down the tissue in the human body and can interfere with the DNA. However, it is claimed that emissions from cellphones are so small that they pose no danger. This has been the mantra of the FCC for many years. There has been much confusion and concern recently as the same organization now claims that further research is needed to determine the effects of radio frequencies, as well as whether they are dangerous to humans.

Complaints have surfaced in the United States and other countries like South Africa where base stations are located in urban areas and even built in gardens where agreement is reached between cellphone networks and home owners. People living in close proximity to base stations have complained of headaches and other health problems. Home owner associations and health researchers have claimed that living too close to base stations or heavy use of cellphones may instigate brain tumors and cancers.

With no official conclusions drawn on the dangers of cellphones, and with more people complaining about the effects, one has to ask the following questions; how dangerous is radio frequencies and what are the risks to human health and the environment? Can constant exposure to radio waves cause free radicals to occur and if so, is there any way to protect ourselves? Are we slowly killing ourselves with the pollution of modern technology? Makes you think, doesn't it?


The Dangers of Radio Waves

Discount Bose Av18 Lowest Price Kef Kht3005

Monday, December 5, 2011

How Do E-Book Readers Compare With Real Books?

!9#: How Do E-Book Readers Compare With Real Books?

The popularity of electronic book readers increased enormously during the course of 2009. The launch of the Amazon Kindle 2.0 and the large format Kindle DX, followed up by competing readers like the Nook from Barnes and Noble and Sony's Daily Edition reader in the latter part of the year, put both readers and e-books firmly on the map. By early 2010 there was a large selection of e-book readers for potential customers to choose from - including the Apple iPad, which includes the ability to read e-books amongst its many options.

Now that e-readers have been taken up by "early adopters", the next wave of potential customers will come from more traditional book readers. Although it's possible to find many (very many) reviews of e-book readers on the internet, and increasingly in magazines and newspapers, the current crop of customers are probably more interested to learn how e-readers stack up against "real" books rather than how they compare with other e-book readers. They want to know if they will miss the feel of a traditional book.

The good news is that the e-ink display technology used in modern e-readers is really very good. The reading experience is nothing like reading on a computer screen - it's much closer to reading text printed on paper.

When you "turn the page" of an e-book, the reader display goes dark very briefly. However, these page turns are much faster now than they were even twelve months ago. After a couple of reading sessions you won't notice them at all. In fact, when you're enjoying a good book, you will be completely unaware of the fact that you're reading it on an electronic device rather than leafing through the pages of a more traditional paper edition.

Most e-readers are very easy to use. A recent survey of American e-book reader owners found that 80% of them actually preferred using their electronic readers to reading a conventional book. That's a fairly strong endorsement - but considering how easy these readers are to use one-handed, on a crowded bus or train, or sitting propped up in bed - it's possibly less surprising than it appears at first glance.

Apart from the numerous advantages of the readers themselves, the e-books to read on them are cheaper than paper books. They don't use paper, ink or bindings and there are no (or very small) delivery fees. They are also, for exactly the same reasons, much more environmentally friendly than conventional books - even when the materials and energy used in the production and delivery of the readers themselves are taken into account.

E-book readers, all things considered, have a lot to recommend them. They are the future of reading and, if you read a book a week or so, could well be quite a bit cheaper than traditional books. At the end of the day, it's a matter of personal preference - but an electronic reader may well be an option which you should give some thought to.


How Do E-Book Readers Compare With Real Books?

Dumbbell Workouts Best Ulysse Nardin Marine Diver Buy

Friday, November 25, 2011

A Few Tips on Noise Cancelling Microphone

!9# A Few Tips on Noise Cancelling Microphone

[if ]
[endif]

The primary function of a noise cancelling microphone is to cancel out any sort of unnecessary, ambient sound with the help of an active noise control. According to the process, the microphone is placed close to the ear and the electronic circuitry produces antinomies sound wave. There are many companies that manufacture noise canceling microphones like Sony, Aiwa Bose etc. The advantage of these noise canceling microphones is that they are not very demanding on the electronic circuitry. Well, the noise canceling microphones need an electrical supply from a battery. They often release hissing sounds of high frequency that becomes frustrating after a certain period of time.

When listening to music or when installed in lawn mowers and refrigerators, noise cancelling microphone becomes very useful. Noise canceling microphones play a vital role in military for receiving clear and accurate audio communication. With the help of these microphones the telephonic conversations can also be made absolutely noise free. Even mountaineers before proceeding to undertake tough expeditions benefit hugely from such noise canceling microphones because there are certain models that are designed to work in a full pressure type oxygen helmet. Noise canceling microphones are used in the entertainment industry to a good extent.

Well, you can even modify your telephone and make it easier to operate once you install these noise cancelling microphones. The background noise makes it quite difficult for the speaker to respond to the person at the other end. But noise isolation microphone will successfully clarify your speech that might otherwise give way to an annoying conversation. However, these microphones have modernized the approach towards noise pollution and have successfully kept it under control. Aiwa HP CN 6, AKG k 28 NC, Bose Quite Comfort, and Jensen c51 are some of the popular models in the market.

Logitech Premium Stereo Headset is one of the best among the existing noise cancelling microphones. It has a good number of features. For instance, its dynamic stereo absolutely immerses you in exciting games and hardcore music. The inline controls of this outstanding noise cancelling microphone make you convenient to adjust volume and mute the microphone. Furthermore, it filters out the unwanted background noise thereby offering you the best possible audio quality. Its ear pads made of soft foam and the headband made of soft rubber gives you superior comfort even when you wish to extend your listening period. So what's the wait for? Bring home today your favorite noise cancelling microphone and expand your entertainment options.


A Few Tips on Noise Cancelling Microphone

Cheep Bissell Pro Lite Citizen Aqualand Watches Immediately !9# Trundle Beds on Sale Now

Sunday, November 13, 2011

Dynamics and Thermodynamics of Systems With Long Range Interactions (Lecture Notes in Physics)

!9# Dynamics and Thermodynamics of Systems With Long Range Interactions (Lecture Notes in Physics)


Rate : | Price : $139.00 | Post Date : Nov 13, 2011 20:33:43
Usually ships in 24 hours

Properties of systems with long range interactions are still poorly understood despite being of importance in most areas of physics. The present volume introduces and reviews the effort of constructing a coherent thermodynamic treatment of such systems by combining tools from statistical mechanics with concepts and methods from dynamical systems. Analogies and differences between various systems are examined by considering a large range of applications, with emphasis on Bose--Einstein condensates. Written as a set of tutorial reviews, the book will be useful for both the experienced researcher as well as the nonexpert scientist or postgraduate student.

Canon Ip90 Printer Buy Great Deals Breast Pump Accessories Medela Bose Acoustic Wave Music System 2 Right Now

Friday, October 21, 2011

What Can Noise Cancelling Headphones Do For You?

!9# What Can Noise Cancelling Headphones Do For You?

[if ]
[endif]

Do you often feel that you're going to go deaf sooner than later because you blast your headphones on the top volume peak possible? Wait, you didn't hear me? Turn your volume down some. I said, if you feel that you're going to go deaf because of your loud volume, you probably are! Just kidding, but you get my drift. People are used to having to turn the volume up way too high in order to get everything out of their favorite song, from the high kicks to the deep rifts. If you are a victim of this practice and wish that you could find a happy medium between turning the volume down some and hearing every element in your favorite song, you might have found your answer with noise cancelling headphones.

What are Noise Cancelling Headphones?

Noise cancelling headphones fit into the new world of technology as a new way to listen to and truly enjoy the quality of music coming from you music source. The new technology has taken the world by storm, giving many people the opportunity to listen to their music without having to turn it all the way up in order to hear all of the subtleties that make it great.

The way they are able to create a crystal clear sound without you having to turn them up is by reducing the ambient (or acoustic) noise in the headset by the speakers. They placed a microphone near the ear that creates a sound wave called antinoise. The sound wave is said to have the opposite polarity of the sound wave that arrives as the microphone. This means, when they meet, they cancel other out; this is called phase cancellation. Once phase cancellation occurs, a new sound wave is produced called destructive interference. The original sound wave is then placed a higher volume than the new sound wave, which eliminates unwanted noise. The end result is a crisp quality of music that allows you to hear every aspect of sound placed in the song.

Noise cancelling headphones have become so popular than many are getting in on the action by creating unique styles, as well as making them available for more devices. So now, you can find these quality headphones at varying price ranges, in over-the-ear, on-the-ear, or even in-the-ear styles, and for everything from your stereo or computer to your handheld musical device.

Bluetooth

I'm sure by now you've heard about Bluetooth technology. You've probably seen the Bluetooth earpiece attached to someone's ear as they've walked down the street looking as though they're talking to themselves. The earpiece, however, is one of the many innovations that have come from the company that specializes in wireless, hands-free technology. In addition to earpieces for your cell phone, they create everything from wireless GPS systems that communicate to your laptop, technology that allows your computer and printer to read pictures from your cell phone, and even blood pressure monitors that can communicate your blood pressure readings to your doctor automatically.

One of their other innovations is the wireless headphone that communicates directly to your iPod, MP3 player or even home stereo through an adapter, or directly if the device is Bluetooth-enabled. And now, many stereo manufacturers are creating Bluetooth-enabled, noise cancelling headphones. So in addition to being able to wear your headphones while moving around your home independent of the device you are listening to, you can enjoy the great quality of noise cancellation too!

For iPods and MP3 Players

The good news is that you can find great noise cancelling headphones that will work well with your iPod or MP3 player. In addition to being able to find Bluetooth-enabled, wireless headphones, you can now get some that even work to create the crystal-clear sound you want straight from your handheld device. So now, if you want to travel with your iPod but don't like the sound quality coming from your complimentary earbuds, you can use your new headset with noise cancellation technology to truly enjoy your trip with the music you love.

Who Offers the Good Ones?

Of course, like everything else, once manufacturers see a good product being sold on the market, they make a point to get in on the action. Unfortunately, this practice may not work as a benefit to you because you may find noise cancellation packaging without the quality to go with it. So to help you out, I have listed a few products on the market that are said to be creating the sound quality they advertise.

Bose Quiet Comfort 2 - Apparently these noise cancelling headphones are all the rage in airline magazines because they provide so much of a distraction to those wanting to avoid the obnoxious sounds of jet engines and babies crying while in mid-flight. They are said to be one of the best headsets on the market (and for the 0 price tag, they darn well better be!). Reviewers say that these incredible headphones block out noise even if music is turned off, and when you do turn it on, the crystal-clear quality will suffer absolutely no interruptions.

Sony MDR-NC33 - These headphones are seen as a jewel among reviewers because they provide great cancellation quality in a small, lightweight package. They are lightweight because they come in the form of earbuds. These great phones are said to have great bass quality, a nice high-frequency clarity and, of course, the absence of ambient sound. One of the downfalls of them, however, is that they are said to have a little hiss, so for the 0 price tag, it is my suggestion that you check them out at your local electronics store before committing to a purchase.

The best way to learn more about noise cancelling headphones is to do your research. Because the good ones tend to be in the pricier range, you want to make sure you get exactly what you desire for the price you're paying. While I know the Internet is a great source for finding products on sale, I highly recommend you test some noise cancelling headphones out in person before buying them online. That way you won't be disappointed when you still have to turn the volume all the way up to hear the sound quality you desire.


What Can Noise Cancelling Headphones Do For You?

Pier One Imports Furniture Purchase !9# Buy Mens Electric Shavers Foldaway Beds Right Now

Wednesday, October 12, 2011

5 Things You Need to Build Your Own Home Cinema

!9# 5 Things You Need to Build Your Own Home Cinema

[if ]
[endif]

Before you get a little excited let me first give you a little background on how home cinemas started. It is believed that home theaters become popular in the 1950s during a time when Kodak 8 mm film projector equipment became affordable. The advancement of both audio and video systems also paved way for home cinemas to reach a new paradigm. Below are 5 general categories of equipment, devices or/and other apparatus to create build a home cinema:

Input Device - first things first, you need some sort of player to access your favorite movie. There are many choices - HDTV, Blu-ray, DVD player, VCD player, and you can also use your personal computer or video game systems. Of course each has its own pros and cons.

Processing Device - it usually provides a more enhanced "home cinema" experience by using standalone AV receiver/preamplifier and sound processor for complex sound formats.

Audio Output - most people are contented with 2 speakers and extra subwoofer but you can add more as you desire.

Video Output - your choices include a HDTV display, LCD TV, plasma TV, video projector, rear-projection TV or for those with tight budget, a typical CRT TV can also do the trick.

Atmosphere - the style of the chairs, movie posters, vending machine, specialized furniture, sophisticated or theatrical room interiors or any other ideas you could possibly think that will make you or your guest to actually think and feel they are inside a movie house.

Apparently, the more you want to experience a real cinematic home viewing the more it will cost you. But you don't really have to buy very expensive devices. You can start one piece at a time. Also remember that it takes true creativity and resourcefulness to put up your very own home cinema.


5 Things You Need to Build Your Own Home Cinema

Mitsubishi Dlp Tv Buy Online Memory Foam Contoured Pillow Compare




Sponsor Links