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opal    音标拼音: ['opəl]
n. 蛋白石,猫眼石

蛋白石,猫眼石

opal
n 1: a translucent mineral consisting of hydrated silica of
variable color; some varieties are used as gemstones

Opal \O"pal\, n. [L. opalus: cf. Gr. ?, Skr. upala a rock,
stone, precious stone: cf. F. opale.] (Min.)
A mineral consisting, like quartz, of silica, but inferior to
quartz in hardness and specific gravity.
[1913 Webster]

Note: The {precious opal} presents a peculiar play of colors
of delicate tints, and is highly esteemed as a gem. One
kind, with a varied play of color in a reddish ground,
is called the {harlequin opal}. The {fire opal} has
colors like the red and yellow of flame. {Common opal}
has a milky appearance. {Menilite} is a brown impure
variety, occurring in concretions at Menilmontant, near
Paris. Other varieties are {cacholong}, {girasol},
{hyalite}, and {geyserite}.
[1913 Webster]

1. A {DSP} language.

["OPAL: A High Level Language and Environment for DSP boards
on PC", J.P. Schwartz et al, Proc ICASSP-89, 1989].

2. The language of the {object-oriented database} {GemStone}.

["Making Smalltalk a Database System", G. Copeland et al, Proc
SIGMOD'84, ACM 1984, pp.316- 325].

3. A {simulation} language with provision for {stochastic
variables}. An extension of {Autostat}.

["C-E-I-R OPAL", D. Pilling, Internal Report,
C.E.I.R. Ltd. (1963)].

4. A language for compiler testing said to be used internally
by {DEC}.

5. A {functional programming} language designed at the
{Technische Universitaet Berlin} as a testbed for the
development of {functional programs}. OPAL integrates
concepts from Algebraic Specification and Functional
Programming, which favour the (formal) development of (large)
production-quality software written in a {purely functional}
style.

The core of OPAL is a {strongly typed}, {higher-order},
{strict} applicative language which belongs to the tradition
of {Hope} and {ML}. The algebraic flavour of OPAL is visible
in the syntactical appearance and in the preference of
{parameterisation} to {polymorphism}.

OPAL supports: {information hiding} - each language unit is
divided into an interface (signature) and an implementation
part; selective import; {parameterised modules}; free
constructor {views} on {sorts}, which allow pattern-based
function definitions despite quite different implementations;
full {overloading} of names; puristic scheme language with no
{built-in} data types (except {Booleans} and denotations).

OPAL and its predecessor OPAL-0 have been used for some time
at the Technische Universitaet Berlin in CS courses and for
research into optimising compilers for applicative languages.
The OPAL compiler itself is writte entirely in OPAL.

An overview is given in "OPAL: Design And Implementation of an
Algebraic Programming Language".

{(http://cs.tu-berlin.de/~opal/)}.

{(ftp://ftp.cs.tu-berlin.de/pub/local/uebb/papers/DesignImplOpal.ps.gz)}.

(1995-02-16)



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  • 14 Different Types Of Opal And What They All Look Like
    Opal is a fascinating mineral known for its unique play of colors and diversity There are many types of opal, each with distinct characteristics that make them special For example, boulder opal, hyalite, and fire opal are all unique forms of this mineral When light hits an opal, it travels through tiny silica spheres inside the stone, creating a rainbow of flashing colors, known as “play
  • Opal - Wikipedia
    Precious opal consists of a regular arrangement of silica nanospheres in closely packed planes (idealized diagram) This precious rough opal from Coober Pedy, South Australia, displays nearly every color of the visible spectrum Precious opal shows a variable interplay of internal colors, and though it is a mineraloid, it has an internal structure At microscopic scales, precious opal is
  • Pictures of Opal - Black, Fire, Boulder, Blue and Pink
    What Is Opal? Opal is one of the world's most popular gemstones and the birthstone for the month of October A nice precious opal can flash every color of the spectrum with an intensity and quality of color that surpasses the fire of diamond The best opals command prices per carat that rival expensive diamonds, rubies, sapphires, and emeralds There are many types of opal found in deposits
  • Online Portal - Nevada
    OPAL: Apply For a License or Endorsement OPAL Instructions for Registration New and existing licensees must register themselves and use OPAL to update contact information, clear provisions, add extensions, apply for additional licenses or endorsements, and start the renewal process Everything uploaded into OPAL must be in the form of a PDF document Please note that Original Transcripts must
  • Opal Gemstone | Opal Stone – GIA
    Opal is the product of seasonal rains that drenched dry ground in regions such as Australia’s semi-desert “Outback ” It is known for its unique display of flashing rainbow colors
  • Opal [Experiment]
    Opal [Experiment]
  • Nevada Department of Education
    2 Have you registered with Online Portal for Application and Licensure (OPAL)?
  • Opal (Common) Gem Guide and Properties Chart - Gemstones. com
    This Opal (Common) gemstone guide lists qualities of the Opal (Common) gem type, including stone colors, common names, meanings, gemstone hardness and more
  • Opal Stone 101: History, Symbolism, and Uses - Australian . . .
    Welcome to the entrancing world of Opal stones, where rich history, profound symbolism, and versatile uses come together Known for their dazzling play of colors, Opals are no ordinary gemstones They are Precious Gemstones that canvas nature's art, encapsulating the beauty of the cosmos with every color of the rainbow in each iridescent shimmer Opal's allure goes beyond its visual charm





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