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(skin)

(aerospace engineering) The covering of a body, such as the covering of a fuselage, a wing, a hull, or an entire aircraft.
(anatomy) The external covering of the vertebrate body, consisting of two layers, the outer epidermis and the inner dermis.
(building construction) The exterior wall of a building.
(engineering) In flexible bag molding, a protective covering for the mold; it may consist of a thin piece of plywood or a thin hardwood.
(metallurgy) A thin outside layer of metal differing in composition, structure, or other characteristics from the main mass of metal but not formed by bonding or electroplating.


 
 

The entire outer surface of the body and the principal boundary between the external environment and the body's internal environment of cells and fluids. Skin serves as the primary barrier against the intrusion of foreign elements and organisms into the body, and also as a large and complex sense organ through which animals explore and learn about the external world. In addition, skin functions to maintain the homeostasis of the body's constituents, acting as a barrier to the loss of various ions and nutrients by diffusion. For terrestrial animals, it also serves as an effective barrier to water loss, without which most land animals would rapidly become desiccated and die.

The skin of humans and other mammals can be divided into two distinct regions, the epidermis and the dermis.

The epidermis is the outermost layer of the skin. It varies in thickness from 0.1 mm in most of the protected areas of the skin to approximately 1 mm in those regions exposed to considerable friction, such as the soles of the feet and palms of the hands. The epidermis consists of a great many horizontally oriented layers of cells. The outermost layer, the stratum corneum, consists of many layers of this packed cellular debris, forming an effective barrier to water loss from lower layers of the skin. The lowest levels of stratum germinativum constitute the portion of the skin that contains melanocytes, cells that produce the dark pigment melanin. Different levels of melanin secretion are responsible for the large range of pigmentation observed among humans.

The dermis plays a supportive and nutritive role for the epidermis. The epidermis has no blood supply of its own. However, nutrients and oxygen are apparently provided by diffusion from the blood supply of the underlying dermis. The average thickness of the dermis is 1–3 mm. It is in this layer that the sebaceous and sweat glands are located and in which the hair follicles originate. The products of all these sets of glands are derived from the rich blood supply of the dermis. Hair, sweat glands, and mammary glands (which are modified sweat glands) are skin inclusions unique to mammals. See also Hair; Integumentary patterns; Sweat gland.


 

(1) A custom covering for a hardware device. For example, there are numerous coverings or replacement cases for cellphones and iPods in myriad colors and styles. Vinyl coverings for the outside of computer tower cases that depict sports, high-tech and other themes are also available.

(2) A custom look and feel of an application or graphical user interface (GUI). Media players and applications, typically in the multimedia genre, are often customizable. They either come with a selection of skins or accept skins from third parties. Windows enables developers to create an entirely different look for the window frames, scroll bars, buttons and elements on the Windows interface. See theme aware. See also skin effect.

New Windows Skins
Stardock's WindowBlinds comes with a host of custom skins for Windows that create a different look for the user interface. The skins as well as mouse actions on the Title bar can also be customized by the user. (Image courtesy of Stardock Corporation, Inc., www.stardock.com)



 

The skin is of interest to psychoanalysis because it is anaclitically related to narcissism, because it is an erotogenic zone, and because it is the object of particular kinds of assaults. Manifestly, the skin is a potential vector for the main instincts (attachment, libido, destructive impulses).

At the end of the first essay of Three Essays on the Theory of Sexuality (1905d), in connection with his notion of polymorphous component instincts, Freud treated the skin as an erotogenic zone specifically excitable by the sadism/masochism "pair of opposites," in contrast with the eyes, which he conceived of as the bodily seat of the voyeurism/exhibitionism antithesis. Later, in his paper " 'A Child Is Being Beaten'" (1919e), he described and analyzed the basic scene in masochism: an active adult beats a passive child, while another child bears silent witness to the event.

The skin has a particular place in the evolution of living beings: while the husk characterizes the vegetable realm and the membrane the animal realm, the skin is peculiar to vertebrates. In the development of the embryo in vertebrates, the ectoderm gives rise to both the skin and the cortex, so that the skin is in a sense the surface of the brain. The structure of the skin is complex in that it is a sense organ that contains the other sense organs. It comprises several interlocked layers of greatly varied structures. The skin and the sense organs that it envelops constitute an interface ensuring the individual's contact with the outside world. Like most outer coverings or membranes, the skin has a twofold nature: it is a protective shield and it facilitates the communication of meanings. Freud mentioned this nature in his discussion of the "mystic writing pad" (1925a [1924]), on which traces and signs are inscribed. The skin helps give the body its form and coherence. The human body can more readily assume a vertical posture because the skin protects and holds in the skeleton and musculature. The unity of the individual thus depends on the skin.

Certain areas of the skin (mucous membranes, erectile tissue, hair on the head, pubic hair, hollows) are especially sensitive to sexual arousal (in comparison with overall presexual skin-to-skin contact). Didier Anzieu has advanced the hypothesis of a fantasy of a skin common to mother and child, and on that basis he developed the idea of a skin ego—an idea that converges with Esther Bick's notion of a psychic skin and Wilfred R. Bion's concept of container/contained. For Anzieu, this fantasy of a common skin contributes both to the narcissistic foundation of the individual and to the anaclitic reinforcement of the sexual instinct.

In sadism and masochism, humans experience a mixture of pleasure and pain. Here the fantasy of a common skin is replaced by the fantasy of its being ripped off, which is necessary if the individual is to progress toward autonomy but also is a source of guilt feelings. Mother's and child's joint cathexis of the newborn's skin is immediate and is sometimes a source of sexual pleasure. Indeed, if the mother does not spontaneously cathect this first contact, any of a large number of pathologies, ranging from asthma to autism, may result.

Psychodermatology has shown a correlation between flaws in the ego and skin disorders. The greater the impairment of the ego, the more seriously the skin seems to be affected.

Bibliography

Anzieu, Didier. (1990). Formal signifiers and the ego-skin. In Didier Anzieu et al. (Eds.), Psychic envelopes (Daphne Briggs, Trans.). London: Karnac Books. (Originally published 1987) ——. (1989). The skin ego (Chris Turner, Trans.). New Haven, CT: Yale University Press. (Originally published 1985) ——. (1994). Le penser: du moi-peau au moi-pensant. Paris: Dunod.

Freud, Sigmund. (1905d). Three essays on the theory of sexuality. SE, 7: 123-243.

——. (1919e). "A child is being beaten": a contribution to the study of the origin of sexual perversions. SE, 17: 175-204.

——. (1925a [1924]). A note upon the "mystic writing pad." SE, 19: 225-232.

—DIDIER ANZIEU

 
Wikipedia: skin (computing)
A Qt program using three different skins: Plastik, Keramik, and Windows
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A Qt program using three different skins: Plastik, Keramik, and Windows

In computing, skins may be associated with themes as custom graphical appearances (GUIs) that can be applied to certain software and websites in order to suit the different tastes of different users. However, a "skin" is also used as slang for a texture applied on a player character of a video game.

"Skinning" software is referred to as being skinnable, and the process of writing or applying such a skin is known as skinning. Applying a skin changes a piece of software's look and feel — some skins merely make the program more aesthetically pleasing, but others can rearrange elements of the interface, potentially making the program easier to use. Although often used simply as a synonym for skin, the term theme normally refers to less-complex customisations, such as a set of icons and matching colour scheme for an operating system — notably, this is how the term was used in association with Windows 95 and Microsoft Plus! for Windows 95.

Probably the most popular customised skins are for instant messaging clients and media players, such as Trillian and Winamp, due to the association with fun such programs try to encourage. However, in programs which use a cross-platform GUI toolkit, rather than using the standard interface for the operating system on which they are running, it is relatively easy to add functionality to alter this interface from within the program. For instance, both the Mozilla and Opera web browsers are skinnable because they take advantage of a cross-platform toolkit. In the case of Mozilla, the entire interface is written in XUL, CSS, and JavaScript. Those who know these languages are free to modify both its look and its behavior.

Of course, it is also possible to change the standard interface. Some platforms have inbuilt support for this, including most using the X Window System. For those that do not, there are usually programs that can add this functionality, like WindowBlinds for Microsoft Windows and ShapeShifter for Mac OS X.

Many websites are also skinnable, particularly those which provide some interactive capabilities. Again, some sites offer skins that make primarily cosmetic changes, while some — such as H2G2 — allow major changes to the layout of pages. As with standalone software interfaces, this is facilitated by the underlying technology of the website — the use of XML and XSLT, for instance, facilitates major changes of layout, while CSS can be used to easily produce different visual styles.

The benefit of skinning in user interfaces is disputed. While some find it useful or pleasant to be able to change the appearance of software they use, a changed appearance can complicate technical support and training. A user interface that has been extensively customized by one person may appear totally unfamiliar to another person who knows the same software under a different appearance.

See also

External links


Skinning communities


 
 
 

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Copyrights:

Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved.  Read more
Computer Desktop Encyclopedia. THIS COPYRIGHTED DEFINITION IS FOR PERSONAL USE ONLY.
All other reproduction is strictly prohibited without permission from the publisher.
© 1981-2008 Computer Language Company Inc.  All rights reserved.  Read more
Psychoanalysis. International Dictionary of Psychoanalysis. Copyright © 2005 by The Gale Group, Inc. All rights reserved.  Read more
Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Skin (computing)" Read more

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