A pixel is generally thought of as the smallest complete sample of an image. The definition is highly context sensitive; for example, we can speak of printed pixels in a page, or pixels carried by electronic signals, or represented by digital values, or pixels on a display device, or pixels in a digital camera (photosensor elements). This list is not exhaustive, and depending on context there are several synonyms that are accurate in particular contexts, e.g. pel, sample, byte, bit, dot, spot, etc. We can also speak of pixels in the abstract, or as a unit of measure, in particular when using pixels as a measure of resolution, e.g. 2400 pixels per inch, 640 pixels per line, or spaced 10 pixels apart.
The measures dots per inch (dpi) and pixels per inch (ppi) are sometimes used interchangeably, but have distinct meanings especially in the printer field, where dpi is a measure of the printer's resolution of dot printing (e.g. ink droplet density). For example, a high-quality inkjet image may be printed with 200 ppi on a 720 dpi printer.
The more pixels used to represent an image, the closer the result can resemble the original. The number of pixels in an image is sometimes called the resolution, though resolution has a more specific definition. Pixel counts can be expressed as a single number, as in a "three-megapixel" digital camera, which has a nominal three million pixels, or as a pair of numbers, as in a "640 by 480 display", which has 640 pixels from side to side and 480 from top to bottom (as in a VGA display), and therefore has a total number of 640 × 480 = 307,200 pixels or 0.3 megapixels.
The pixels, or color samples, that form a digitized image (such as a JPEG file used on a web page) may or may not be in one-to-one correspondence with screen pixels, depending on how a computer displays an image.
Many display and image-acquisition systems are, for various reasons, not capable of displaying or sensing the different colour channels at the same site. This approach is generally resolved by using multiple subpixels, each of which handles a single colour channel. For example, LCD displays typically divide each pixel horizontally into three subpixels. Most LED displays divide each pixel into four subpixels; one red, one green, and two blue. Most digital camera sensors also use subpixels, by using coloured filters. (CRT displays also use red-green-blue phosphor dots, but these are not aligned with image pixels, and cannot therefore be said to be subpixels).
Green Teas which are stoped fermentation by steaming.
The most popular type of Green Teas. About 85% of Japanese teas are SENCHA. In both quality and price SENCHA has a wide variety.
High quality one is served only on special occasions.But average qualities are for everyday use.
This is the vest Japanese Tea. It is a precious tea and it si served as a treat to visitores. GYOKURO means "the dew of jewels".
GYOKURO has a stronger flavor and aroma with less bitterness tha SENCHA. This is because when the buds are about to come out, the teas bushes are shaded.
This is known as using TEA CEREMONY.
This is a type of tea ground to a fine powder. To make MACCHA tea is mixed in hot water with banboo whisk.
This is understood as a lowest grade of TEA.
But some BANCHA is very nice as a different meaning.
It has a very simple taste, so it is pleased to drink after meals or to drink when thirsty.
This is a roasted BANCHA.
It has a brown color and unique tosted flavor, and light golden beer color when steeped.
It is also pleased to drink after meals or when thirsty.
The way to serve HOUJICHA is same as BANCHA.
It is tea buds selected while refining SENCHA or GYOKURO.
It has strong flavor and taste. It is better than caffee when standing sleeepy.
It is tea stems also selected while refining.
It taste light and has fresh flavor. It is also everyday use.
It is a mixture of BANCHA and popped GENMAI (hulled rice kernels). It makes a light brown tea with a savory flavor. It is also everyday use.
A firehose is a thick, high-pressure hose used to carry water or other fire retardant (such as foam) to a fire to extinguish it. Outdoors, it is attached either to a fire engine or a fire hydrant. Indoors, it can be permanently attached to a building's standpipe or plumbing system.
The usual working pressure of a firehose can vary between 8 Bar (0.8 MPa) - 20 bar (2.0 MPa), while its bursting pressure can be up to 63 bar (6.3Mpa). (This level of pressure emitted by the hose can actually break in a weaker brick wall.)
This high pressure also allows the fire hose to serve as an effective form of crowd control, including most notably by Bull Connor in the Deep South against civil rights protestors.
(courtesy wikipedia.com)
In mathematics, an ellipse (from the Greek for absence) is the locus of points on a plane where the sum of the distances from any point on the curve to two fixed points is constant. The two fixed points are called foci (plural of focus).
(courtesy wikipedia.com)
An ellipse is a type of conic section: if a conical surface is cut with a plane which does not intersect the cone's base, the intersection of the cone and plane is an ellipse. For a short elementary proof of this, see Dandelin spheres.
Algebraically, an ellipse is a curve in the Cartesian plane defined by an equation of the form
such that B2 <>, where all of the coefficients are real, and where more than one solution, defining a pair of points (x, y) on the ellipse, exists.
An ellipse can be drawn with two pins, a loop of string, and a pencil. The pins are placed at the foci and the pins and pencil are enclosed inside the string. The pencil is placed on the paper inside the string, so the string is taut. The string will form a triangle. If the pencil is moved around so that the string stays taut, the sum of the distances from the pencil to the pins will remain constant, satisfying the definition of an ellipse.
This is an Iris, not an orchid. The flag Iris is the national flower
of France, & is the origin of the fleur de lis symbol, which incidentally is part
of the [Trinity] College emblem!
(courtesy of Tamar Lewit)
Lecturer in Charge, History of Ideas in Trinity College
Fire is not a state of matter: rather, it is an exothermic chemical reaction accompanied by intense heat released during a rapid oxidation of combustible material. Fire may be visible as the brilliant glow and flames and may produce smoke.
Fires start when a flammable or combustible material with adequate supply of oxygen or other oxidizer is subjected to enough heat. The common fire-causing sources of heat include a spark, another fire (such as an explosion, a fire in the oven or fireplace, or a lit match, lighter or cigarette) and sources of intense thermal radiation (such as sunlight, a flue, an incandescent light bulb or a radiant heater). Mechanical and electrical machinery may cause fire when combustible materials used on or located near the equipment are exposed to intense heat from Joule heating, friction or exhaust gas. Fires can sustain themselves by the further release of heat energy in the process of combustion and may propagate, provided there is continuous supply of oxygen and fuel. Fires may become uncontrolled and cause great damage to and destruction of human life, animals, plants and property.
Fire is extinguished when any of the elements of so-called fire triangle—heat, oxygen or fuel—is removed. The unburnable solid remains of fire are called ash.
In the mid 1990s, cost-effective traffic light lamps using light-emitting diodes (LEDs) were developed; prior to this date traffic lights were designed using incandescent or halogen light bulbs. Unlike the incandescent-based lamps, which use a single large bulb, the LED-based lamps consist of an array of LED elements, arranged in various patterns. When viewed from a distance, the array appears as a continuous light source (unless closely examined).
LED-based lamps have numerous advantages over incandescent lamps; among them are:
The operational expenses of LED-based signals are far lower than equivalent incandescent-based lights. As a result, most new traffic light deployments in the United States, Canada and elsewhere have been implemented using LED-based lamps; in addition many existing deployments of incandescent traffic lights are being replaced. Many of the more exotic traffic signals discussed on this page would not be possible to construct without using LED technology.
In some areas, LED-based signals have been fitted (or retrofitted) with special Fresnel lenses and/or diffusers to limit the line of sight to a single lane. These signals typically have a "projector"-like visibility; and maintain an intentionally limited range of view.
In the late 1990s, a national standardization effort known as the Advanced transportation controller (ATC) was undertaken by the Institute of Transportation Engineers. They are attempting to create a single national standard for traffic light controllers. The standardization effort is part of the National Intelligent transportation system program funded by various highway bills, starting with ISTEA in 1991, followed by TEA-21, and subsequent bills.
(courtesy wikipedia.com)
