Flight dynamics

Flight dynamics is the study of the performance, stability, and control of vehicles flying through the air or in outer space. It is concerned with how forces acting on the vehicle influence its speed and attitude with respect to time.

In fixed-wing aircraft, the changing orientation of the vehicle with respect to the local air flow is represented by two critical parameters, angle of attack ("alpha") and angle of sideslip ("beta"). These angles describe the vector direction of airspeed, important because it is the principal source of modulations in the aerodynamic forces and moments applied to the aircraft.

Spacecraft flight dynamics involve three forces: propulsive (rocket engine), gravitational, and lift and drag (when traveling through the earths or any other celestial atmosphere). Because aerodynamic forces involved with spacecraft flight are very small, this leaves gravity as the dominant force.

Aircraft and spacecraft share a critical interest in their orientation with respect to the earth horizon and heading, and this is represented by another set of angles, "yaw," "pitch" and "roll" which angles match their colloquial meaning, but also have formal definition as an Euler sequence. These angles are the product of the rotational equations of motion, where orientation responds to torque, just as the velocity of a vehicle responds to forces. For all flight vehicles, these two sets of dynamics, rotational and translational, operate simultaneously and in a coupled fashion to evolve the vehicle's state (orientation and velocity) trajectory.

List auf Sylt

List auf Sylt (known as List until 31 December 2008) is the northernmost municipality in Germany, located on the North Sea island of Sylt close to Denmark in the district of Nordfriesland in the state of Schleswig-Holstein.

Etymology

List derived from the Middle Low German Liste (ledge, bar or edge).

History

List was originally a Danish settlement. It was first mentioned in 1292 (Lystum). The original village was destroyed by the great flood of 1364. The settlement was rebuilt further east from the previous location. In the mid-15th century, a church named St. Jürgen was mentioned. In a treaty of 1460, Schleswig and Holstein were linked to the Danish crown, but List remained part of the royal enclaves, small areas of the Kingdom of Denmark situated within the Duchy of Schleswig, but directly controlled by the Danish king.

From the 16th century, the people of List mostly made a living from Oyster farming, raising sheep and collecting and selling gull eggs. At the time, List was an important protective anchorage. In 1644, a Swedish-Dutch fleet of 26 ships commanded by Admiral Thijssen was attacked in the Lister Tief and defeated by Danish ships commanded by king Christian IV of Denmark. The anchorage north of today's town was named Königshafen to honour this event.

Fictional universe of The Guardians of Time

In the fictional Guardians of Time Trilogy, author Marianne Curley constructs a highly detailed alternate universe in which much of the action of the series takes place, unknown to the regular world. In this universe, two organizations battle for control over time.

The Guard

The Guardians of Time (known also as The Guard) is a society dedicated to preserving history against the attempts of the Order of Chaos to alter it. It is headed by a sexless immortal called Lorian, who is backed by a Tribunal of nine members, each a representative of a house.

The headquarters of the Tribunal, as well as the Guard itself, is located in Athens, year 200 BC, outside of the mortal measurements of time. For their purposes, they also use a place called the Citadel, connected to another area known as the labyrinth (also used by Order of Chaos) which serves as a disembarkation point for the Guards' missions into the past. Guard meetings frequently take place in Arkarian's, a Guard member's, abode hidden within the depths of a mountain. Connected to this mountain is the hidden city of Veridian and later learned, also connected to Neriah's fortress.

Order (biology)

In biological classification, the order (Latin: ordo) is

What does and does not belong to each order is determined by a taxonomist. Similarly for the question if a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognised only rarely.

For some groups of organisms, consistent suffixes are used to denote that the rank is an order. The Latin suffix -(i)formes meaning "having the form of" is used for the scientific name of orders of birds and fishes, but not for those of mammals and invertebrates. The suffix -ales is for the name of orders of vascular plants.

Order (business)

In business or commerce, an order is a stated intention, either spoken or written, to engage in a commercial transaction for specific products or services. From a buyer's point of view it expresses the intention to buy and is called a purchase order. From a seller's point of view it expresses the intention to sell and is referred to as a sales order. When the purchase order of the buyer and the sales order of the seller agree, the orders become a contract between the buyer and seller.

Within an organization, the term order may be used to refer to a work order for manufacturing, a preventive maintenance order, or an order to make repairs to a facility.

In many businesses, orders are used to collect and report costs and revenues according to well-defined purposes. Then it is possible to show for what purposes costs have been incurred.

Spoken orders

Businesses such as retail stores, restaurants and filling stations conduct business with their customers by accepting orders that are spoken or implied by the buyer's actions. Taking a shopping cart of merchandise to a check-out counter is an implied intent to buy the merchandise. Placing a take-out or eat-in order at a restaurant is a spoken purchase order. Putting gasoline in one's tank at a filling station is an implied order. The seller usually expects immediate payment by cash, check or credit card for these purchases, and the seller provides the buyer with a receipt for the payment. In legal terms, this form of business order is an "implied in fact contract".