Del

Del, or nabla, is an operator used in mathematics, in particular, in vector calculus, as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes its standard derivative as defined in calculus. When applied to a field (a function defined on a multi-dimensional domain), del may denote the gradient (locally steepest slope) of a scalar field (or sometimes of a vector field, as in the Navier–Stokes equations), the divergence of a vector field, or the curl (rotation) of a vector field, depending on the way it is applied.

Strictly speaking, del is not a specific operator, but rather a convenient mathematical notation for those three operators, that makes many equations easier to write and remember. The del symbol can be interpreted as a vector of partial derivative operators, and its three possible meanings—gradient, divergence, and curl—can be formally viewed as the product with a scalar, dot product, and cross product, respectively, of the del "operator" with the field. These formal products do not necessarily commute with other operators or products.

Deel (clothing)

A deel (Mongolian: дээл [teːɮ]; Buryat: дэгэл) is an item of traditional clothing commonly worn since centuries ago among the Mongols and other nomadic tribes of Central Asia, including various Turkic peoples, and can be made from cotton, silk, wool, or brocade. The deel is still commonly worn by both men and women outside major towns, especially by herders. In urban areas, deels are mostly only worn by elderly people, or on festive occasions. The deel appears similar to a caftan or an old European folded tunic. Deels typically reach to below the wearer's knees and fan out at the bottom and are commonly blue, olive, or burgundy, though there are deels in a variety of other colors.

Description

The deel looks like a large overcoat when not worn. Instead of buttoning together in the middle, the sides are pulled against the wearers body, the right flap close to the body with the left covering. On the right side of the wearer are typically 5 or 6 clasps to hold the top flap in place. There is one clasp below the armpit, three at the shoulder, and either one or two at the neckline.

Alpha Delphini

Alpha Delphini (α Del, α Delphini) is a multiple star in the constellation Delphinus. It also has the name Sualocin, which was given to it as a practical joke by the astronomer Niccolò Cacciatore; the name is the Latinized version (Nicolaus) of his given name, spelled backwards.

In Chinese, 瓠瓜 (Hù Guā), meaning Good Gourd, refers to an asterism consisting of α Delphini, γ² Delphini, δ Delphini, β Delphini and ζ Delphini. Consequently, α Delphini itself is known as 瓠瓜一 (Hù Guā yī, English: the First Star of Good Gourd.).

Properties

Alpha Delphini has seven components: A and G, a physical binary, and B, C, D, E, and F, which are optical binaries and have no physical association with A and G.

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Courier

A courier is a person who delivers messages, packages, and mail.

Duties and functions

Couriers are distinguished from ordinary mail services by features such as speed, security, tracking, signature, specialization and individualization of express services, and swift delivery times, which are optional for most everyday mail services. As a premium service, couriers are usually more expensive than standard mail services, and their use is normally limited to packages where one or more of these features are considered important enough to warrant the cost.

Courier services operate on all scales, from within specific towns or cities, to regional, national and global services. Large courier companies include DHL, OCS, FedEx, DTDC, EMS International, TNT, UPS, and Aramex. These offer services worldwide, typically via a hub and spoke model.

Before the industrial era

In ancient history, runners and homing pigeons and riders on horseback were used to deliver timely messages. Before there were mechanized courier services, foot messengers physically ran miles to their destinations. To this day, there are marathons directly related to actual historical messenger routes. In the Middle Ages, royal courts maintained their own messengers who were paid little more than common labourers.

Courier (comics)

Courier is the alias of Jacob Gavin Jr., a fictional character appearing in American comic books published by Marvel Comics. The character is a sometime ally of the X-Men member known as Gambit. Created by writer Fabian Nicieza and artist Joe Madureira, he first appeared Deadpool: The Circle Chase (1993).

Fictional character biography

Courier was a foot soldier and employee of the New Son, to whom Gambit was indebted after New Son saved him from perishing in the Antarctic where the X-Men left him after his 'trial' exposed Gambit's connection to Mister Sinister, the Marauders, and the Mutant Massacre. Courier would deliver assignments to Gambit on the behalf of New Son, who had not yet deemed the mutant thief worthy of a face-to-face encounter.

It has been stated, by Wolverine and other sources, that Courier is part of a business that has performed such tasks for many years, and that Courier's father is an important business figure in the Marvel Universe, having bought stock in AT&T when he was only ten years old. He has the mutant ability to control every cell in his body.

Courier (automobile)

The Courier was a brass era car manufactured by Sandusky Automobile Company in Sandusky, Ohio in 1904 and 1905.

The 1904 Courier was a runabout model. It could seat 2 passengers and sold for US$650, making it one of the lowest-priced cars on the market at the time. The flat-mounted single-cylinder engine, situated at the center of the car, produced 7 horsepower (5.2 kW). A 2-speed sliding transmission was fitted. The angle iron-framed car weighed 1,000 pounds (450 kg) and used Concord springs.

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