Sunday, October 25, 2009
Specific Absorption Rate (SAR)
SAR (specific absorption rate) is a measurement of how much electromagnetic radiation is absorbed by body tissue whilst using a mobile phone. The higher the SAR the more radiation is absorbed.
In Europe, the European Union Council has adopted the recommendations made by the International Commission on Non-Ionising Radiation Protection (ICNIRP Guidelines 1998). These recommendations set a SAR limit of 2.0 W/kg in 10g of tissue. The UK Government has endorsed this limit (following a report by the Independent Expert Group on Mobile Phones) and the five mobile phone network operators have agreed to voluntarily adopt the ICNIRP guidelines for public exposure. All mobile phones on sale in the UK comply with this limit.
In the United States, the Cellular Telecommunications and Internet Association (CTIA) requires all cell phones to comply with the Federal Communications Commission (FCC) SAR limit of 1.6 W/kg in 1g of tissue.
How to reduce your exposure to phone radiation
• Do not use your phone more than necessary and keep your calls short
• Send a text instead of making a call
• Try to avoid using your phone if the signal strength is low - find a better location to make a call
• Try to use the phone outdoors rather than inside, or move close to a window to make a call
• Keep the phone (and particularly the aerial) as far as possible from your head
• Avoid touching the aerial while the phone is turned on, and keep the phone away from areas of the body such as eyes, testicles, breasts and internal organs
• Limit usage as much as possible if pregnant
• Switch off your phone when not in use
You should be aware that if the phone is receiving a very strong signal from a base station, then power output can be reduced by up to 1000 times compared with when the phone has a poor signal.
Click here to check your handphone SAR values.
Friday, August 7, 2009
Radio Frequency Identification RFID)
Radio frequency identification (RFID) is a generic term that is used to describe a system that transmits the identity (in the form of a unique serial number) of an object or person wirelessly, using radio waves. It's grouped under the broad category of automatic identification technologies.
Radio-frequency identification (RFID) use an object (typically referred to as an RFID tag) applied to or incorporated into a product, animal, or person for the purpose of identification and tracking using radio waves. Some tags can be read from several meters away and beyond the line of sight of the reader.
Auto-ID technologies include bar codes, optical character readers and some biometric technologies, such as retinal scans. The auto-ID technologies have been used to reduce the amount of time and labor needed to input data manually and to improve data accuracy.
Most RFID tags contain at least two parts. One is an integrated circuit for storing and processing information, modulating and demodulating a radio-frequency (RF) signal, and other specialized functions. The second is an antenna for receiving and transmitting the signal.
Managing Your Money
Here are some steps that you can use for managing your money wisely:
1. Step your financial goal.
2. Know where your money goes to.
3. Assess your spending habits.
4. Write down your spending plan.
Thursday, July 30, 2009
Blu-ray Disc
Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage medium designed to supersede the standard DVD format. Its main uses are for storing PlayStation 3 games, high-definition video, and data storage, with up to 25 GB per single layered, and 50 GB per dual layered disc. The disc has the same physical dimensions as standard DVDs and CDs.
The name Blu-ray Disc derives from the blue-violet laser used to read the disc. While a standard DVD uses a 650 nanometre red laser, Blu-ray uses a shorter wavelength, a 405 nm blue-violet laser, and allows for almost six times more data storage than on a DVD.
During the format war over high-definition optical discs, Blu-ray competed with the HD DVD format. Toshiba, the main company supporting HD DVD, ceded in February 2008, and the format war ended, then in July 2009, announced plans to put out its own Blu-ray Disc device by the end of 2009.
Blu Ray Disc
- Media type High-density optical disc Encoding MPEG-2, H.264/MPEG-4 AVC, and VC-1
- Capacity 25 GB (single-layer).
- 50 GB (dual-layer) Block size 64kb ECC Read mechanism 405 nm laser:
- 1× at 36 Mbit/s (4.5 MByte/s)
- 2× at 72 Mbit/s (9 MByte/s)
- 4× at 144 Mbit/s (18 MByte/s)
- 6× at 216 Mbit/s (27 MByte/s)
- 8× at 288 Mbit/s (36 MByte/s)
- 12× at 432 Mbit/s (54 MByte/s) Usage Data storage
- High-definition video
- High-definition audio
PlayStation 3 games
UMTS (Universal Mobile Telecommunications Service) - 3G
3G Systems are intended to provide a global mobility with wide range of services including telephony, paging, messaging, Internet and broadband data. International Telecommunication Union (ITU) started the process of defining the standard for third generation systems, referred to as International Mobile Telecommunications 2000 (IMT-2000). In Europe European Telecommunications Standards Institute (ETSI) was responsible of UMTS standardisation process. In 1998 Third Generation Partnership Project (3GPP) was formed to continue the technical specification work. 3GPP has five main UMTS standardisation areas: Radio Access Network, Core Network, Terminals, Services and System Aspects and GERAN.
HSDPA - 3.5 G
HSDPA, short for High-Speed Downlink Packet Access, is a new protocol for mobile telephone data transmission. It is known as a 3.5G (G stands for generation) technology. Essentially, the standard will provide download speeds on a mobile phone equivalent to an ADSL (Asymmetric Digital Subscriber Line) line in a home, removing any limitations placed on the use of your phone by a slow connection. It is an evolution and improvement on W-CDMA, or Wideband Code Division Multiple Access, a 3G protocol. HSDPA improves the data transfer rate by a factor of at least five over W-CDMA. HSDPA can achieve theoretical data transmission speeds of 8-10 Mbps (megabits per second). Though any data can be transmitted, applications with high data demands such as video and streaming music are the focus of HSDPA.
HSDPA improves on W-CDMA by using different techniques for modulation and coding. It creates a new channel within W-CDMA called HS-DSCH, or high-speed downlink shared channel. That channel performs differently than other channels and allows for faster downlink speeds. It is important to note that the channel is only used for downlink. That means that data is sent from the source to the phone. It isn't possible to send data from the phone to a source using HSDPA. The channel is shared between all users which lets the radio signals to be used most effectively for the fastest downloads.
The widespread availability of HSDPA may take a while to be realized, or it may never be achieved. Most countries did not have a widespread 3G network in place as of the end of 2005. Many mobile telecommunications providers are working quickly to deploy 3G networks which can be upgraded to 3.5G when the market demand exists. Other providers tested HSDPA through 2005 and are rolling out the service in mid to late 2006. Early deployments of the service will be at speeds much lower than the theoretically possible rates. Early service will be at 1.8 Mbps, with upgrades to 3.6Mbps as devices are made available that can handle that increased speed.
The long-term acceptance and success of HSDPA is unclear, because it is not the only alternative for high speed data transmission. Standards like CDMA2000 1xEV-DO and WiMax are other potential high speed standards. Since HSDPA is an extension of W-CDMA, it is unlikely to succeed in locations where W-CDMA has not been deployed. Therefore, the eventual success of HSDPA as a 3.5G standard will first depend upon the success of W-CDMA as a 3G standard.
For more information, click http://www.wisegeek.com/what-is-hsdpa.htm
What is WiMAX???
WiMAX meaning Worldwide Interoperability for Microwave Access is a wireless digital communications system, also known as IEEE 802.16, that is intended for wireless "metropolitan area networks". It is a telecommunications technology that provides wireless transmission of data using a variety of transmission modes, from point-to-multipoint links to portable and fully mobile[citation needed] internet access WiMAX can provide broadband wireless access (BWA) up to 30 miles (50 km) for fixed stations, and 3 - 10 miles (5 - 15 km) for mobile stations. In contrast, the WiFi/802.11 wireless local area network standard is limited in most cases to only 100 - 300 feet (30 - 100m). The name "WiMAX" was created by the WiMAX Forum, which was formed in June 2001 to promote conformity and interoperability of the standard. The forum describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL.
WiMAX can be used for wireless networking in much the same way as the more common WiFi protocol. WiMAX is a second-generation protocol that allows for more efficient bandwidth use, interference avoidance, and is intended to allow higher data rates over longer distances.
WiMAX is the next-generation of wireless technology designed to enable pervasive, high-speed mobile Internet access to the widest array of devices including notebook PCs, handsets, smartphones, and consumer electronics such as gaming devices, cameras, camcorders, music players, and more. As the fourth generation (4G) of wireless technology, WiMAX delivers low-cost, open networks and is the first all IP mobile Internet solution enabling efficient and scalable networks for data, video, and voice. As a major driver in the support and development of WiMAX, Intel has designed embedded WiMAX solutions for a variety of mobile devices supporting the future of high-speed broadband on-the-go.
Mobile WiMAX is the next revolution in wireless technology that will enable pervasive, high-speed connectivity to meet the ever-increasing demand for broadband Internet on the go. Delivering the next leap in the mobile network evolution with fourth generation (4G) wireless, WiMAX will drive a wide array of devices well beyond what's available today, including notebooks, phones, consumer electronic devices, Mobile Internet Devices (MIDs) and more.
IEEE 802.16 Specifications
Range 30 mile radius from the base station for LOS (line-of-sight).
Range 4-6 miles radius from the base station for NLOS (Non-line-of-sight)
Maximum data speed supported as 70 Mbps.
Licensed frequency band: 2- 11 GHz
Un-licensed frequency band: 10- 66 GHz
Line of sight is not needed between user and the base station unless very high date rates are required at the user premises.
Tuesday, July 28, 2009
HTC Touch Pro2
The good: The HTC Touch Pro2 features a sharp, spacious touch screen and an easy-to-use full QWERTY keyboard. The Windows Mobile smartphone also includes conference call management tools for business users and offers good call quality. It also has Wi-Fi, Bluetooth, and GPS.
The bad: The smartphone is heavy and bulky. No U.S. 3G support on this version and it's expensive. Onboard memory is low, and we would have liked an upgraded camera.
The bottom line: With a feature set to match its large size, the HTC Touch Pro2 will be a great device for power and business users once it finally hits North America and adds U.S. 3G support.
Model | HTC Touch Pro2 (T7373) |
Processor | Qualcomm® MSM7200A™, 528 MHz |
Operating System | Windows Mobile® 6.1 Professional |
Memory | ROM: 512 MB RAM: 288 MB |
Dimensions(LxWxT) | 116 X 59.2 X 16.65 mm (4.57 X 2.33 X 0.66 inches) |
Weight | 178.5 grams (6.3 ounces) with battery |
Display | 3.6-inch TFT-LCD touch-sensitive screen with 480 X 800 WVGA resolution Adjustable tilt screen |
Network | HSPA/WCDMA:
|
Device Control | TouchFLO™ 3D Zoom bar |
Keyboard | Slide-out 5-row QWERTY keyboard |
GPS | Internal GPS antenna |
Connectivity | Bluetooth® 2.1 with Enhanced Data Rate and A2DP for wireless stereo headsets Wi-Fi®: IEEE 802.11 b/g HTC ExtUSB™ (11-pin mini-USB 2.0, audio jack, and TV Out* in one) |
Camera | Main camera: 3.2 megapixel color camera with auto focus Second camera: VGA CMOS color camera |
Audio supported formats | AAC, AAC+, eAAC+, AMR-NB, AMR-WB, QCP, MP3, WMA, WAV, MIDI, M4A |
Video supported formats | WMV, ASF, MP4, 3GP, 3G2, M4V, AVI |
Battery | Rechargeable Lithium-ion battery Capacity: 1500 mAh Talk time:
(The above are subject to network and phone usage.) |
Expansion Slot | microSD™ memory card (SD 2.0 compatible) |
AC Adapter | Voltage range/frequency: 100 ~ 240V AC, 50/60 Hz DC output: 5V and 1A |
Special Features | G-Sensor Straight Talk™ Noise-cancelling dual microphones and speakers |
Dell Alienware M17x
Dell Alienware gaming laptop : Hard-core gamers and technology enthusiasts will find much to celebrate with the new Dell Alienware M17x laptop. The new Dell Alienware M17x laptop is the most powerful 17-inch gaming notebook in the universe and delivers a pulse-pounding, life-like experience. In support of the launch, Dell unveiled a new “All Powerful” marketing campaign to reach gamers throughout the universe and that it will expand Alienware’s presence from six to 35 countries. Just as Dell’s Adamo brand represents premium craftsmanship and design, Alienware represents premium performance in the Dell consumer product portfolio and is the new standard-bearer in the broader gaming and technology space.
Processor: Intel Core 2 Extreme X9300
Frequency of the CPU (GHz): 2.53
RAM: 8 GB
RAM type: DDR2
Capacity HDD 1 (GB): 500
Rotational speed of the disc 1: 7200tr/mn
Capacity HDD 2 (GB): 500
Rotational speed of the disc 2: 7200tr/mn
Disk interface (s) drive (s): Serial ATA
Turbo Memory: NA
1 Optical Drive: Combo Blu-ray/BD-RE
Optical Drive 2: No
TV Tuner: No
Television command: No
Fingerprint Reader: No
WebCam: Yes
size of screen (inches): 17
Format of the screen: 16:10
Screen resolution: 1920 x 1200 pixels
Graphics card: 2 x Nvidia GeForce GTX 280M
Graphics memory: 2 x 1024 MB DDR3
Wednesday, July 22, 2009
Latest OS from Microsoft - Windows 7
Windows 7 will be available on October 22. It includes tons of little refinements — and a few big ones—many suggested by you. The result? Everyday computing is faster, simpler, easier.
Perhaps the biggest surprise - and for Microsoft, possibly the biggest boost - is a feature that has been announced but not yet available: Windows XP Mode, which will run XP applications in an XP compatibility box, but make them appear as if they are running directly in Windows 7 itself. In this way, Microsoft hopes to give users the best of both worlds - the compatibility of XP and the shinier new Windows 7 interface.
The feature sounds underwhelming until you dig into the details. According to Microsoft, you won't actually have to manually run Virtual PC to run those XP applications once you've installed them; instead, they will appear to work directly within Windows 7.
You'll just have to run Virtual PC the first time and run the application - from that point on, it will appear to be just other application running directly in Windows 7 (at least, that's the promise). And you won't have to buy XP separately - your Windows 7 EULA (end-user licence agreement) includes XP as well. In essence, you get two operating
This solves one of Microsoft's biggest problems with XP very cleverly - it's such a solid, stable operating system that people simply don't want to give it up to move to a newer operating system. Now they don't have to - they can run XP as if it were a part of Windows 7. Microsoft says Windows
Canon EOS 500D
The 500D/T1i doesn't quite have to be the everyman camera that its predecessors were. The introduction of the Rebel XS (1000D) in June 2008 means the T1i no longer has to appeal to everybody who doesn't want to stretch to buying into the 50D class. As a result, the 450D was able to bulk up its feature set to include a selection of features that price-conscious shoppers don't necessarily realize they want, such as a larger viewfinder and spot metering. The result was probably the most complete Rebel we'd seen.
- Higher resolution sensor (15.1 vs 12.2 effective megapixels)
- Extended ISO range up to ISO 12800
- HD video capability
- New 3.0 inch 920K pixels screen
- Adjustable noise reduction and highlight tone priority
- Face Detection in Live View
- Peripheral Illumination Correction
- HDMI output
- Larger buffer in continuous shooting
- Digic 4 style menu design
There's a full explanation of the differences between the 500D/T1i and it predecessor on the coming pages but, in general terms, it's a gentle re-working of the 450D. So you get the 15MP sensor much like the one that appears in the 50D, helping this to become the first entry-level DSLR to feature video (and 1080p HD video at that). You also get the lovely 920,000 dot VGA monitor that has been slowly working its way down most manufacturer's DSLR line-ups. There are a handful of other specification tweaks that come from the use of the latest Digic 4 processor but essentially this is most of a 50D stuffed into the familiar 450D body.
Sony CyberShot DSC-W180
Also supplied with the Sony CyberShot W180 is the latest version (4.2.01) of Picture Motion Browser software (for PC). The software makes it easy to manage and share your collection of digital photos and video clips and for uploading these to YouTube, Picasa or other image and video sharing web-sites.
Sony Cybershot DSC-W180 features
• Effective Pixels : 10.1 megapixels
• Sensor : 1 / 2.33 type Super HAD CCD
• Lens : Sony camera lens
• Zoom : 3x Optical Zoom
• ISO : 3200
• Face Detection function : Yes
• Smile shutter function : Yes
• LCD Display : 2.7” Clear Photo LCD
• Camera battery Life : 145 mins
• Image stabiliser : SteadyShot
• Camera colours : Silver, Black, Red
Samsung Star S5233
Samsung Star will be available in Pink, White and Black colors and will sell across Europe, Africa and Asia.
The phone runs a number of standard widgets for photos, music, clock, calendar, etc. on the left side of the screen that you can drag and drop into the home screen for easy access. The home screen is also extended to 2 more screens just by swiping your finger sideways (there are 3 small dots that indicates which screen you are in). This is one feature from Android I like since it gives an impression that you have a larger virtual screen to work on.
At the bottom of the screen are 3 physical buttons — two for making/dropping calls and a center button that functions as cancel/back button. While the phone is just 12mm thick, the phone feels thicker than it seems although you get a good hold of it with one hand.
The speakers in the front is loud and crisp at low volume (probably due to the DNSe) but doesn’t have enough bass. The camera at the back is 3.15MP (2048×1536 pixels) but no autofocus so captured images aren’t even decent enough to post here. If you’re looking for connectivity options, the Samsung Star might not be for you — no WiFi, no 3G (just GPRS/EDGE), no GPS — just Bluetooth with A2DP.
Philips Xenium X830
The full specs of the X830 are listed below, you will notice that it won’t have 3G, WiFi or GPS, these are features that you would expect for a phone of its class. We hope they’ve just forgotten to put them in!
- Quad-band GSM connectivity with GPRS and EDGE
- 3 inch TFT touchscreen display with 320 x 240 pixels and 262k colors
- Stereo Bluetooth
- Music and video players
- FM-radio with RDS
- 5MP camera with autofocus
- 47MB of internal memory
- MicroSDHC card support, up to 8 GB
- MiniUSB
- 105 x 53 x 15.5 millimeters
- 120 grams