Duality (film)

Duality is a Star Wars fan film created by Mark Thomas and Dave Macomber that made its debut on the internet on February 10, 2001. It is one of the first fan films to exclusively use bluescreen footage composited onto virtual backgrounds.

Plot

Sith apprentice Lord Rive (Macomber), is tasked by his master, Darth Oz (Thomas), to battle another apprentice, Darth Blight (Muraoka), as a final test determining who would serve by Oz’s side. The two would-be Sith clash violently with their double-bladed lightsabers while Oz watches via hologram. After a long and vicious lightsaber duel, Rive's weapon is severed in two and Blight loses his saber. A quick brawl later and the two engage in a final bout with the two halves of Rive's saber. It ends with Rive impaled and Blight bisected through the waist. After they die, Darth Oz appears in the flesh. Consumed with fury and wrath at his failure to procure a permanent apprentice, he electrocutes the bodies of the two failed apprentices with Force Lightning.

Duality (CoPs)

In the context of a Community of practice the notion of a duality is used to capture the idea of the tension between two opposing forces which become a driving force for change and creativity. Wenger (Wenger 1998) uses the concept of dualities to examine the forces that create and sustain a Community of Practice. He describes a duality thus: '... a single conceptual unit that is formed by two inseparable and mutually constitutive elements whose inherent tensions and complementarity give the concept richness and dynamism' (Wenger 1998, p. 66).

Some compare the concept of a duality to that of Yin and Yang, i.e. two mutually defining opposites.

The opposing entities in a duality need to be viewed from a perspective of balance rather than opposition. The term implies a dynamism, continual change and mutual adjustment as the tensions that are inherent in dualities can be both creative and constraining. (Wenger 1998) identifies four dualities that exist in Communities of Practice: participation-reification, designed-emergent, identification-negotiability and local-global.

Duality (mechanical engineering)

In mechanical engineering, many terms are associated into pairs called duals. A dual of a relationship is formed by interchanging force (stress) and deformation (strain) in an expression.

Here is a partial list of mechanical dualities:

Examples

Constitutive relation

See also

References

Duality (electrical circuits)

In electrical engineering, electrical terms are associated into pairs called duals. A dual of a relationship is formed by interchanging voltage and current in an expression. The dual expression thus produced is of the same form, and the reason that the dual is always a valid statement can be traced to the duality of electricity and magnetism.

Here is a partial list of electrical dualities:

History

The use of duality in circuit theory is due to Alexander Russell who published his ideas in 1904.

Examples

Constitutive relations

Voltage division — current division

Impedance and admittance

Film (Iranian magazine)

Film (Persian:فیلم) is an Iranian film review magazine published for more than 30 years. The head-editor is Massoud Mehrabi.

References

External links

Lubrication theory

In fluid dynamics, lubrication theory describes the flow of fluids (liquids or gases) in a geometry in which one dimension is significantly smaller than the others. An example is the flow above air hockey tables, where the thickness of the air layer beneath the puck is much smaller than the dimensions of the puck itself.

Internal flows are those where the fluid is fully bounded. Internal flow lubrication theory has many industrial applications because of its role in the design of fluid bearings. Here a key goal of lubrication theory is to determine the pressure distribution in the fluid volume, and hence the forces on the bearing components. The working fluid in this case is often termed a lubricant.

Free film lubrication theory is concerned with the case in which one of the surfaces containing the fluid is a free surface. In that case the position of the free surface is itself unknown, and one goal of lubrication theory is then to determine this. Surface tension may then be significant, or even dominant. Issues of wetting and dewetting then arise. For very thin films (thickness less than one micrometre), additional intermolecular forces, such as Van der Waals forces or disjoining forces, may become significant.

List of film periodicals

Film periodicals combine discussion of individual films, genres and directors with in-depth considerations of the medium and the conditions of its production and reception. Their articles contrast with film reviewing in newspapers and magazines which principally serve as a consumer guide to movies.

Magazines and trade publications

Scholarly journals

References

Bibliography