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Thursday, September 11, 2014

iPad

The iPad is not a replacement for a laptop. Tablets are good at many things, but their abilities are a subset of a laptop's. You can't, for example, burn a music CD to listen to in the car, or a DVD of your latest home movie. It isn't particularly easy to print from an iPad, either, although it is possible in some apps (you can print an email, a document or a web page if you have a compatible printer).
Features of iPad or Advantages of iPad: 
1)Battery life:
With an iPad, you'll be freed from the mains all day, since it will last for at least eight (if not 10 or 12) hours of constant use.
2)Portability and comfort:

It's more comfortable to sit and use an iPad, it doesn't get too warm and there are no fans, unlike most laptops whose high-pitched fans can drive you to distraction.
3)Touchscreen interface :
You can type very fast on the iPad's virtual, on-screen keyboard.The iPad's interface is, in general, hugely intuitive.
4)Instant on and connected standby:
An iPad doesn't take minutes to boot up: it's ready to go instantly, so it's quick to check email and Facebook, or the weather forecast or TV listings.

iPad

Disadvantages of iPad: 
1) Storage:
The iPad has no way of adding storage, so you're effectively stuck with the capacity you buy.
2)File formats:
 The iPad is much more restrictive and requires videos, for example, to be in MP4 (H.264) format before they'll play. It means you might have to convert files before you can play them, which could be more hassle than you're willing to accept.
For photos and music, the iPad supports the common JPG and MP3 formats, so these aren't a problem for most people.
Education and healthcare
The iPad has several uses in the classroom, and has been praised as a valuable tool for homeschooling.Soon after the iPad was released, it was reported that 81% of the top book apps were for children. The iPad has also been called a revolutionary tool to help children with autism learn how to communicate and socialize more easily.
In the healthcare field, iPads and iPhones have been used to help hospitals manage their supply chain. For example, Novation, a healthcare contracting services company, developed VHA PriceLynx (based on the mobile application platform of business intelligence software vendor MicroStrategy), a business intelligence app to help health care organizations manage its purchasing procedures more efficiently and save money for hospitals. Guillermo Ramas of Novation states, "Doctors won't walk around a hospital with a laptop. With an iPad it's perfect to walk around the hospital with as long as they have the information they need."
In 2013, Gianna Chien (aged 14) presented to more than 8,000 doctors at the Heart Rhythm Society meeting that Apple iPad 2 can, in some cases, interfere with life-saving heart devices (pace maker) because of the magnets inside. Apple's webpage has advised pacemaker users to keep iPads at least 6-inches away from the pacemaker.

iBooks
The iPad has an optional iBooks application that can be downloaded from the App Store, which displays books and other ePub-format content downloaded from the iBookstore.

Internet connectivity in iPad:
The iPad can use Wi-Fi network trilateration from Skyhook Wireless to provide location information to applications such as Google Maps. The 3G model supports A-GPS to allow its position to be calculated with GPS or relative to nearby cellphone towers; it also has a black strip on the back to aid 3G reception. The iPad has a headphone jack and a proprietary Apple dock connector, but no Ethernet or USB port. However, the Apple Camera Connection Kit accessory provides two dock connector adapters for importing photos and videos via USB and SD memory cards.

Global warming and green house effect

 The heating up of the earth surface due to trapping of infrared radiations reflected by earth's surface by CO2 layer in the atmosphere is called green house effect.

Some major green house gases and their sources:


GasSources
Carbon Dioxide
(CO2)
1)Fossil fuel combination (coal,oil,natural gas)
2) Deforestation and land use changes
Methane
(CH4)
1) Enteric fermentation in cattle and insects.
2) Biomass burning and garbage land fills
3) Leakage of gases from coal mines and natural gas.
4) Rice paddies
5) Swamps and tundra
Chloro fluoro carbon
(CFC'S)
1) Plastic foams
2) Refrigeration and air-conditioning
3) Aerosols (spray propellants) CFC'
4) Industrial solvents
Nitrous oxide
(N2O)
1) Fertilizer use
2) Fossil fuel combustion
3) Biomass burning
4) Changing land use

Global warming and green house effect

An increase in average temperature  of the earth's atmosphere due to green house effect which can have effects on climate and key life, support system of planet.
An increase in global temperature is also likely to increase the incidences of infections diseases like malaria, dengue, sleeping sickness and yellow fever.

Computer model predicts that during next 50 years the average temperature rise from 1.5 0 C to 3.5 0C.
Such a change ,which is very rapid by natural standards ,could have far reaching effects , especially at extreme levels .These could be in the form of
1) a rise in sea levels up-to 5 to 6 meters from the melting of ice cap and glaciers and the thermal expansions of sea water.
2) altered climate pattern altering ecosystems and
3) more extremes of weather .

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