Wednesday, March 31, 2010
Tuesday, March 30, 2010
Monday, March 29, 2010
Sunday, March 28, 2010
Saturday, March 27, 2010
Friday, March 26, 2010
Thursday, March 25, 2010
Wednesday, March 24, 2010
Monday, March 22, 2010
Sunday, March 21, 2010
The crankset, or chainset, is the component of a bicycle drivetrain that converts the reciprocating motion of the rider's legs into rotational motion used to drive the chain, which in turn drives the rear wheel. It consists of one or more sprockets, also called chainrings or chainwheels attached to the cranks or arms to which the pedals attach. It is connected to the rider by the pedals, to the bicycle frame by the bottom bracket, and to the rear sprocket, cassette or freewheel via the chain.
Saturday, March 20, 2010
Friday, March 19, 2010
Thursday, March 18, 2010
Wednesday, March 17, 2010
Tuesday, March 16, 2010
The nuraghe (plural in Italian nuraghi, while in Sardinian nuraghes) is the main type of megalithic edifice found in Sardinia, dating back before 1000 BC. Today it has come to be the symbol of Sardinia and its distinctive culture.
The typical nuraghe is situated in a panoramic spot and has the shape of a truncated conical tower resembling a beehive. The structure has no foundations and stands only by virtue of the weight of its stones, which may weigh as much as several tons. Some nuraghes are more than 20 metres in height.Today, there are more than 8,000 nuraghes still extant in Sardinia, although it has been estimated that they once numbered more than 30,000. Nuraghes are most prevalent in the northwest and south-central parts of the island
Monday, March 15, 2010
A Broch is an Iron Age drystone hollow-walled structure of a type found only in Scotland. Brochs include some of the most sophisticated examples of drystone architecture ever created, and belong to the classification "complex Atlantic Roundhouse" devised by Scottish archaeologists in the 1980s. Their origin is a matter of some controversy: the theory that they were essentially defensive military structures is not accepted by many modern archaeologists, and the notion that they were farmhouses is ridiculed by some others. They were almost certainly originally roofed and although most stand alone in the landscape, some examples exist of brochs surrounded by clusters of smaller dwellings.
Sunday, March 14, 2010
In immunology, an adjuvant is an agent that may stimulate the immune system and increase the response to a vaccine, without having any specific antigenic effect in itself. The word “adjuvant” comes from the Latin word adjuvare, meaning to help or aid. "An immunologic adjuvant is defined as any substance that acts to accelerate, prolong, or enhance antigen-specific immune responses when used in combination with specific vaccine antigens."
Adjuvants have been called the dirty little secret of vaccines in the scientific community, because much about how adjuvants work is a mystery. Known adjuvants include oils, aluminum salts, and virosomes.
Saturday, March 13, 2010
Miscibility is a term commonly used in chemistry that refers to the property of liquids to mix in all proportions, forming a homogeneous solution. In principle, the term applies also to other phases (solids and gases), but the main focus is on the solubility of one liquid in another. Water and ethanol, for example, are miscible since they mix in all proportions.
By contrast, substances are said to be immiscible if in any proportion, they do not form a solution. For example, diethyl ether is fairly soluble in water, but these two solvents are not miscible since they are not soluble in all proportions.
Friday, March 12, 2010
Thursday, March 11, 2010
Wednesday, March 10, 2010
Bock is a strong lager which has its origins in the Hanseatic town of Einbeck, Germany. The name is a corruption of the medieval German brewing town of Einbeck, but also means male deer or goat in German; the word is a cognate of the English "buck". The original Bocks were dark beers, brewed from high-colored malts. Modern Bocks can be dark, amber or pale in color. Bock was traditionally brewed for special occasions, often religious festivals such as Christmas, Easter or Lent.
Bocks have a long history of being brewed and consumed by Roman Catholic monks in Germany. During the spring religious season of Lent, monks were required to fast. High-gravity Bock beers are higher in food energy and nutrients than lighter lagers, thus providing sustenance during this period. Similar high-gravity Lenten beers of various styles were brewed by Monks in other lands as well (see Trappist beer).
Tuesday, March 9, 2010
Monday, March 8, 2010
In geometry, an enneagram is a nine-pointed geometric figure. The term derives from two ancient Greek words: ennea (nine) and gramma (something written).
Sunday, March 7, 2010
The word is most commonly used in medical and philosophical theories, where it is used to refer to the study of why things occur, or even the reasons behind the way that things act, and is used in philosophy, physics, psychology, government, medicine, theology and biology in reference to the causes of various phenomena. An etiological myth is a myth intended to explain a name or create a mythic history for a place or family.
Saturday, March 6, 2010
Friday, March 5, 2010
In architecture, a transom is the term given to a transverse beam or bar in a frame, or to the crosspiece separating a door or the like from a window or fanlight above it. Transom is also the customary U.S. word used for a transom light, the window over this crosspiece. In England, the transom above a door is usually referred to as a fanlight, and occasionally as an "overlight", or by the French word "vasistas". The word "fanlight" derives from the fan-like shape of early transoms, which became a traditional part of the Georgian style. "Vasistas" sounds similar to the German phrase "was ist das?" ("what is that?"); hence folk etymology ascribes its origin to a visiting German's reaction to seeing a transom during a trip to France.
Thursday, March 4, 2010
The "Kulbitinscy" (or simply, "Kulbit") is an aerial maneuver developed by Russian pilots, in which the aircraft performs an incredibly tight diametered loop, often not much wider than the length of the aircraft itself. It is an example of post-stall maneuvering, a type of supermaneuverability. Like most post-stall maneuvers, it demonstrates pitch control outside of the normal flight envelope wherein pitch control is made possible by having aerodynamic flow over the aircraft's elevators or stabilators.
The Kulbit drastically decelerates the aircraft and could theoretically be used to cause a pursuing aircraft to overshoot its target. The maneuver is closely related to the famous "Pugachev's Cobra" maneuver, but the Kulbit completes the loop that the Cobra almost immediately cuts off.
Wednesday, March 3, 2010
A bootleg turn is a radical driving maneuver intended to reverse the direction of travel of a forward-moving automobile by 180 degrees in a minimum amount of time while staying within the width of a two-lane road. This maneuver is also known as a smuggler's turn, powerslide or simply a bootlegger.
Tuesday, March 2, 2010
Due to its combination of decades long scheduled service and length of time spent at supersonic speeds, the main user of supercruise has been Concorde, with more time spent in supercruise flight than all of the other aircraft put together.