Tuesday, January 03, 2006
Monday, September 19, 2005
Yesterday, a black scorpion 'visited' my home..just happen to see and 'toast' its fragile skin with hot thermos....
Thursday, July 14, 2005
Beyond Plasma and LCD TV
Revolution of TV screen:
CRT to LCDs to Plasma to OLED / SED / DLP
Advantage of LCDs over plasma
- Picture quality is similar to plasmas;
- LCDs are immune to the burn-in that can affect plasma displays. This burn-in occurs when plasma units are used to display static images such as video game screens and stock or sports tickers.
Advantage of plasma over LCDs
- Plasmas generally have an edge in the ability to produce deeper blacks and more saturated colors than LCDs.
- Plasmas are also better at producing full motion video than LCDs because of the response time of the LCD panels, although this difference is disappearing.
- LCD TVs are a bit more expensive than plasmas at 42" and larger sizes,
- Plasma displays should last 20,000 – 25,000 hours and LCDs should give 30,000+ hours of useful life. However, the latest generation of plasma displays from NEC is claimed to have a 60,000 hour life.
OLED, for Organic Light Emitting Diode
- Developed by Kodak and Pioneer, this technology has been used for a few years in car stereo and cell phone displays. It's just about ready for prime time. Philips has shown a 13">
- emits it’s own light, so it requires no backlight and has better contrast than a traditional LCD
- have a wide viewing angle like a plasma display
- Power usage is very low, less than 1/2 that of a traditional LCD display. At around 2mm deep, OLEDs are much thinner than either a plasma or LCD.
- have fewer parts than LCD or plasma and can be manufactured using a novel ink jet printing process. This promises to keep prices low as the technology is implemented.
SED (Surface-conduction Electron-emitter Display)
- under development by Toshiba and Canon Inc. since the 1990s, is a combination of CRT (cathode ray tube) and LCD (liquid crystal display) technologies.
- basic construction is two glass plates separated by a vacuum. One of the plates is coated with phosphors the other is mounted with electron emitters. Electrons are ejected when a voltage of about 16 to 18 V is applied to the emitters. These electrons are then accelerated by a higher voltage into a beam similar to that in a CRT display
- SED display is only an inch or two thick, depending upon screen size.
- produce pictures that are as bright as CRT pictures and they don't have the slight time delay sometimes seen with LCDs and PDPs (plasma display panels),
- use up to one-third less power than PDP panels of the same size
- A unit shown by Toshiba at a Japanese trade show in April of 2005 even had it’s contrast ratio up to an incredible 100,000 to 1 by significantly reducing black luminance. Even if the specs were a bit inflated this would still amount to a fantastic contrast ratio, on the order of 5 times that of a traditional CRT
DLP (Digital Light Projetion) - (add in after Letti comment...Thanks )
DLP vs LCD
- common complaint of LCD technology is the "Screen Door Effect" which causes the image to appear pixilated. DLP technology has a competitive advantage over LCD in reduced pixilation, because the pixels are much closer together and produce a cleaner image.
- LCD units typically have better color saturation than DLP
- LCD units can develop irreparable pixels, which can leave small blank spots on your screen
- DLP units can produce a higher contrast video with deeper black levels than an LCD
- LCD units tends to produce a sharper image, but with the "Screen Door Effect" this may cause noticeable problems
- DLP units are usually lighter in weight, because there are less internal components
- It is commonly thought that DLP's will last longer, but their most problematic issue is a bad lamp, which could cost up to 400 dollars to fix. Most manufacturers will warranty their lamps for a set period of time, but outside of the warranty it is the consumers responsibility. While lamp issues may arise the beautiful thing about a DLP is that it functions by light and mirrors, so the image quality will not degrade over time.
This is how it is done.
Wednesday, July 06, 2005
After 172 days and 431 million kilometers (268 million miles) of deep space stalking, Deep Impact successfully reached out and touched comet Tempel 1. The collision between the coffee table-sized impactor and city-sized comet occurred at 1:52 a.m. EDT. (14/7/2005)
Comets are time capsules that hold clues about the formation and evolution of the solar system. They are composed of ice, gas and dust, primitive debris from the solar system's distant and coldest regions that formed 4.5 billion years ago. Deep Impact, a NASA Discovery Mission, is the first space mission to probe beneath the surface of a comet and reveal the secrets of its interior.
The Deep Impact mission lasts six years from start to finish. Planning and design for the mission took place from November 1999 through May 2001. The mission team is proceeding with the building and testing of the two-part spacecraft. The larger "flyby" spacecraft carries a smaller "impactor" spacecraft to Tempel 1 and releases it into the comet's path for a planned collision. The spacecraft will be launched to air space with the help of Boeing Delta II rocket.
On July 4, 2005, the Deep Impact spacecraft arrives at Comet Tempel 1 to impact it with a 370-kg (~820-lbs) mass. On impact, the crater produced is expected to range in size from that of a house to that of a football stadium, and two to fourteen stories deep. Ice and dust debris is ejected from the crater revealing fresh material beneath. Sunlight reflecting off the ejected material provides a dramatic brightening that fades slowly as the debris dissipates into space or falls back onto the comet. Images from cameras and a spectrometer are sent to Earth covering the approach, the impact and its aftermath.
Sixty-nine days before it gets up-close-and-personal with a comet, NASA's Deep Impact spacecraft successfully photographed its quarry, comet Tempel 1, at a distance of 39.7 million miles. The image, taken on April 25, 2005, is the first of many comet portraits Deep Impact will take leading up to its historic comet encounter on July 4.
This image shows comet Tempel 1 as seen through the clear filter of the medium-resolution camera on NASA's Deep Impact spacecraft. It was taken on July 1, 2005, when the spacecraft was 2,446,529.1 kilometers (1,520,273 miles) away from the comet. Five images were combined together, and a logarithmic stretch was applied to enhance the coma of the comet.
This display shows highly processed images of the outburst of comet Tempel 1 between June 22 and 23, 2005. The images were taken by Deep Impact's medium-resolution camera. An average image of the comet has been subtracted from each picture to provide an enhanced view of the outburst. The intensity has also been stretched to show the faintest parts. This processing enables measurement of the outflow speed and the details of the dissipation of the outburst. The left image was taken when the comet was very close to its normal, non-bursting state, so almost nothing is visible.
A picture of Tempel 1(left) taken by Deep Impact's medium-resolution camera is shown next to data of the comet taken by the spacecraft's infrared spectrometer. This instrument breaks apart light like a prism to reveal the "fingerprints," or signatures, of chemicals. Even though the spacecraft was over 10 days away from the comet when these data were acquired, it detected some of the molecules making up the comet's gas and dust envelope, or coma. The signatures of these molecules - including water, hydrocarbons, carbon dioxide and carbon monoxide - can be seen in the graph, or spectrum.
This false-color image shows comet Tempel 1 as seen by Chandra X-ray Observatory on June 30, 2005, Universal Time. The comet was bright and condensed. The X-rays observed from comets are caused by an interaction between highly charged oxygen in the solar wind and neutral gases from the comet. The observatory detected X-rays with an energy of 0.3 to 1.0 kilo electron Volts. The bulk of the X-rays were between 0.5 and 0.7 kilo electron Volts.
This plot consists of data taken by the Deep Impact's medium-resolution instrument before the mission's scheduled collision with comet Tempel 1. It shows the total brightness of the comet versus time until impact. Two outbursts of the comet can be seen as sharp peaks. One occurred three and two-third days before impact, and another just less than two days before. The large-scale, more gradual peaks are due to the rotation of the elongated comet nucleus. One rotation period is 41.85 hours. These data were acquired by the mission's navigation team.
These water maps of Tempel 1 show the location of water molecules around the comet. Each image corresponds to a different time interval - two before a comet outburst (left), one near the peak of an outburst (middle), and one after the outburst (right). The outward motion of the water during the outburst can be seen. This information will be used to understand the process by which outbursts occur.
This image shows comet Tempel 1 approximately 5 minutes before Deep Impact's probe smashed into its surface. It was taken by the probe's impactor targeting sensor. The Sun is to the right of the image and reveals terrain varying in brightness by a factor of two. Shadows and bright areas indicate surface topography. Smooth regions with no features (lower left and upper right) are probably younger than rougher areas with circular features, which are most likely impact craters. The probe crashed between the two dark-rimmed craters near the center and bottom of the comet.
This movie shows Deep Impact's impactor probe approaching comet Tempel 1. It is made up of images taken by the probe's impactor targeting sensor. The probe collided with the comet at 10:52 p.m. Pacific time, July 3 (1:52 a.m. Eastern time, July 4).
This image from NASA TV is a view from Deep Impact's flyby showing the impactor colliding with comet Tempel 1.
This image shows the initial ejecta that resulted when NASA's Deep Impact probe collided with comet Tempel 1 at 10:52 p.m. Pacific time, July 3 (1:52 a.m. Eastern time, July 4). It was taken by the spacecraft's high-resolution camera 13 seconds after impact. The image has been digitally processed to better show the comet's nucleus
Saturday, July 02, 2005
Roger Federer - The invincible
Source : FedererMagic