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Choosing the better OS out of the three will be based largely on what you want to do on your phone. If it’s simple texting and calling, you can pick any of the three, no issues there. For anything else, read about the qualities and shortcomings that each OS has.

Symbian
In 2008, Symbian held 65% of the worldwide shares in smart phones. They were the kings of the phone software world, free to do whatever they wanted. But, that was 2008. And even then they had things to worry about. At that time, the iPhone and the Android were minorities, but they were forces to be reckoned with. Cutting to 2011, I doubt you’ll see anyone with a Symbian on their screens. The reason? Symbian is hard to use, hard to develop and well, old. If it was all about Nokia then, it is all about the Samsungs and the iPhones now. People seem to have forgotten the excitement in the air when Nokia released the first line of smart phones. Truth be told, you just might find Symbian users that will swear by their OS. But if you look at the market numbers, you’ll know just how bad Symbian has it. Speculations are that it might just disappear by 2015.

iOS
Tired of your Symbian? Enter the iPhone, all new and sparkling, set to dazzle everyone with its mighty display and the Apple logo. If you ask anyone who uses an iPhone, you’ll notice that they will never moan about their phone being bad. That’s because it isn’t. iPhone users will always tell you how awesome their phone is, or how completely normal and alright their iOS is. If you use an iPhone, you’ll never hate it. Starting off as an opponent to Symbian, the iPhone has now more of a style statement than a smart phone that has things people really need to get things done. All that apart, there are some things the iOS is really good at.

It can be very user friendly. The concept of the iOS is the same as the OS on Apple Macs, so if you’ve used a Mac before, you’ll know your way around the iPhone too. The fact that they integrated the phone with the OS to such a deep extent to provide the most seamless experience ever is kind of mixed bag of reactions. You don’t just like an iPhone, you love it. Every single app will be on your Christmas list. But again, you need to pay for the apps. You can debate on how ‘true quality’ is never free, but I beg to differ. If there was a single thing you saw somewhere else that you wanted on the iPhone, but it wasn’t on the list or you didn’t have the money, you will end up regretting buying the phone. Anything that belongs to Google probably can’t be used by an iPhone user. The same, however, doesn’t really go for Android users. And that, pretty much sums up the iOS, speed, simplicity and quality for a price. read more »

Many people are interested in travelling because it can bring a lot of happiness to us.Ok,let me share my experience with you.Travelling all over the world is one of my hobbies.Travelling can greatly benefit me.First of all,it is a good way to keep healthy.Experts all hold the view that doing exercise every day is a good habit.If you are always staying in your room and play computer games,you tend to be ill in the future.Second,there are so many wonderful resorts in the world.Do not you think that it is reasonable for you to have a look at them.Our life is limited and we should do our best to experience more things when we are alive.

Let me recommend some interesting tours to you in the following words.First,you can not miss ireland tours if you want to go to the iceworld.I have been to Ireland many times.I am sure that it will give you many wondeful experiences.Second,australia tours.As is known to us that it is still winter in Australia now.So,you can go there if you do not like summer.I hate hot weather very much.That is why I do my best to stay in Australia for weeks.There are a lot of wonderful resorts in Australia,such as Sydney Opera House.They are known to the people all over the world.If you have the chance to go there,you should not miss them.Third,travel machu picchu.In fact,I have never been to Machu Picchu.However, many of my friends speak highly of it.They all recommend me that I should go there.In order to get more detailed information about it,I consult collettevacations.com for help.It is a global leader of world travel and Escorted Tours, offering 150 vacation choices on all seven continents.With the help of it,you will find that travelling is a very easy thing!

Ok,that is all.I hope you can like the tours introduced by me!

Recently, Facebook launched the facial recognition technology in United States and soon made it available in ‘certain’ countries. One usually clicks their pictures at a party or some other event with friends and uploads it next day on Facebook. The site quietly identifies each of the friends featuring in these particular photos. If they have been previously tagged in different photos, the Facebook facial recognition software will try and identify them. In doing so, the user is automatically given suggestions of the people it thinks are featured in the photo. All the user needs to do is select the particular friend name and say ‘yeah, Tag them’. They can even ‘Save’ a particular tag and tag all the pictures at once. This makes things easier for the user and helps in saving time, apparently. This is all the fun part, now coming down to serious business. We need to think about Facebook facial recognition privacy issues as well. We shall deal with these later in the article. We will first continue with the instructions to disable Facebook’s facial recognition feature, the reason you landed on this page.

Instructions for Disabling the Facial Recognition Feature on Facebook
Like always, this feature is automatically activated and has become functional before the users get a chance to understand it. If you opt to disable it then Buzzle will help you learn how to disable the facial recognition feature. The method is quite simple and explained below:

1. You need to first log into your Facebook account.
2. Now, go to your Profile page or stay on your Home page and click on the ‘Account’ drop down menu. You can locate the ‘Accounts’ tab on the far right corner of the page.
3. From the drop down menu, select ‘Privacy Settings’.
4. Now, click on the tab that says ‘Custom’ and then ‘Customize Settings’. You will see, a tiny little pencil icon near the Customize settings tab.
5. You need to look for the section that says ‘Things others share’ and go to ‘Suggest photos of me to friends’. This is what we are looking for and you need to click on ‘Edit Settings’.
6. A new window will pop up and ask you ‘Photos: Suggest Tags’. Here, you need to select ‘Disable’ and then click on ‘Okay’. This will help you save your settings.

Silica occurs in nature in more than 13 different structures, each one slightly varying from the others. The physical properties might be different but the chemical properties remain the same, irrespective of the structure. In order to obtain a clearer understanding of the many properties of silicon dioxide or silica, it is important that we have the basic idea about the molecular structure of this oxide of silicon.

The building block of the structure of silica is the SiO4 unit. The structure of crystalline forms of silica is represented as continuous links of the SiO4 unit. The image above shows the structure of silicon dioxide. Silicon dioxide is formed when silicon is exposed to the oxygen in the atmosphere. If you look at the atomic model of silicon dioxide, you’ll see that the four oxygen atoms (shown in blue) are located far apart from the silicon atom at the centre (shown in green), with the molecule forming a tetrahedral structure (as shown by the thin black lines). Here are some facts about the molecular structure of silicon dioxide.
•The angle formed between each -O-Si-O- bond is 109.5 degrees. However, in quartz, this angle is around 144 degrees.
•There is uneven charge distribution between parts of the tetrahedron, with the center being highly positive and the corners being strongly negative. This is because of the strong polarity of the Si-O bond.
•In gaseous state, the structure of silicon dioxide forms linear O=Si=O molecules.
•Each individual SiO4 tetrahedron is connected with adjacent tetrahedrons at the corners, forming a three-dimensional structure.
•The “bridge” formed by the oxygen atoms between the silicon atoms of adjacent tetrahedrons, is responsible for some of the unique properties of silicon dioxide.
•The tetrahedral shape is responsible for the rigidity of the silicon dioxide molecule.
•The length of the Si-O bond is 0.16 nm.

Rotary Phase Converter
The rotary phase converter consists of a motor, which has three windings inside it. Two of the windings, act as a motor and the third winding acts as a generator. The need for a generator is to generate a balanced power in the machine circuit. The motor generator is also used for phase conversions (AC to DC or DC to AC), ‘DC’ stands for direct current and ‘AC’ stands for alternating current. The rotary phase converter has a shaft near the input voltage source, to detect the variations in the voltage, so as to prevent the machine from damage due to high voltage. A three phase motor and large number of capacitors constitute a single, small device which looks like a big capacitor, in the rotary phase converter. The three terminals of the motor are connected to the output of the rotary phase converter. The motor used in the device has the capacity to withstand a higher HP than the output power expected.

Digital Phase Converter
Digital phase converter is a recent technology that uses microprocessor programming to control the solid state devices used in the phase converter. The input rectifier (device that converts AC to DC) of the digital phase converter consists of an IGBT (Insulated Gate Bipolar Transistors), which is connected in series with an inductor. The process of conversion to three phase power, in this device is called as double IGBT conversion, as the main component used is IGBT, which is a fast switching semiconductor device operating at 10,000 Hz. In the conversion process, the AC power is converted to DC and then back to AC by IGBT. IGBT does not directly produce an AC signal. It produces a PWM (Pulse Width Modulation Wave), which is passed through the capacitor or an inductor, because it is a fact that, capacitors block DC and allow only AC. Digital Signal Processor (DSP) is the microprocessor used in the device, which continuously monitors the input voltage to produce a balanced three phase power. If the input voltage is considerably high, the DSP switches out, to prevent the damage of the phase converter due to high voltage.

Variable Frequency Drive
In this device, the frequency or speed of the AC induction motor is controlled by the variable frequency drive (VFD). The VFD sends a modulating signal to the AC motor, thereby controlling its speed. Variable frequency drive is also known as variable speed drives, as it controls the speed of the AC motor. This device is commonly used in fans, pumps, etc., for efficient power consumption, smooth start-up and to save electricity. Ramping is an important factor in the functioning of the motor. The VFD sets the ramp up time, reference time and ramp down time of the motor, to reduce the mechanical wear of the device using VFD. Ramping is very important because sudden acceleration from the switch on time to the operating speed or sudden decline from the operating speed to the device off time, will cause damage to the VFD operating devices. So, to avoid this, ramping is necessary.