- published: 02 Jul 2019
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A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusc. Just like the shell of a clam, a pearl is composed of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those currently sold. Imitation pearls are also widely sold in inexpensive jewelry, but the quality of their iridescence is usually very poor and is easily distinguished from that of genuine pearls. Pearls have been harvested and cultivated primarily for use in jewelry, but in the past were also used to adorn clothing. They have also been crushed and used in cosmetics, medicines and paint formulations.
Pearl was an American literary journal published between 1974 and 2014 in Long Beach, California.
Pearl was founded by Joan Jobe Smith in 1974. The first issue appeared in May 1974. It was edited by Joan Jobe Smith, Marilyn Johnson, and Barbara Hauk. Pearl was based in Long Beach. It released an annual fiction issue and an annual poetry issue as well as hosting an annual poetry prize.
After several issues published Pearl went defunct until 1986 when Joan Jobe Smith and Marilyn Johnson relaunched it.
The magazine ceased publication in 2014.
A pearl is a hard object produced by mollusks.
Pearl may also refer to:
Nicknamed Pearl
Roll may refer to:
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.
The Euler angles are three angles introduced by Leonhard Euler to describe the orientation of a rigid body. To describe such an orientation in 3-dimensional Euclidean space three parameters are required. They can be given in several ways, Euler angles being one of them; see charts on SO(3) for others. Euler angles are also used to describe the orientation of a frame of reference (typically, a coordinate system or basis) relative to another. They are typically denoted as α, β, γ, or φ, θ, ψ.
Euler angles represent a sequence of three elemental rotations, i.e. rotations about the axes of a coordinate system. For instance, a first rotation about z by an angle α, a second rotation about x by an angle β, and a last rotation again about y, by an angle γ. These rotations start from a known standard orientation. In physics, this standard initial orientation is typically represented by a motionless (fixed, global, or world) coordinate system; in linear algebra, by a standard basis.
Any orientation can be achieved by composing three elemental rotations. The elemental rotations can either occur about the axes of the fixed coordinate system (extrinsic rotations) or about the axes of a rotating coordinate system, which is initially aligned with the fixed one, and modifies its orientation after each elemental rotation (intrinsic rotations). The rotating coordinate system may be imagined to be rigidly attached to a rigid body. In this case, it is sometimes called a local coordinate system. Without considering the possibility of using two different conventions for the definition of the rotation axes (intrinsic or extrinsic), there exist twelve possible sequences of rotation axes, divided in two groups:
🎶 musicTap on Spotify ➜ https://www.musictap.online/spotify 🎶 When we heard this track for the first time, we fell in love with it straight! Beautiful & relaxing summer vibes by brilliant ilkan Gunuc! Enjoy & share the emotion! Follow musicTap Facebook: https://www.facebook.com/musictapofficial Spotify: https://www.musictap.online/spotify Instagram: https://www.instagram.com/musictapofficial Soundcloud: https://soundcloud.com/musictapofficial Follow ilkan Gunuc https://soundcloud.com/djilkangunuc https://www.facebook.com/djilkangunucofficial https://twitter.com/djilkanGunuc https://instagram.com/ilkangunuc Follow TFB Records https://www.instagram.com/tfbrecords https://www.fb.com/thefameousbrother 📝For any business enquiries, photo and song submissions or anything else please do not h...
Tbilisi: A main stay of Oscar Mulero's Pole Group label, its PEARL / Falling Ethics with the heavy-hitting and deep techno, live and open-air above the beautiful capitol of Georgia! #BoilerRoom #LiveMusic #Music #Mix #Khidi #Mzesumira
Mitski's new album 'Be The Cowboy is' out now on Dead Oceans: https://mitski.ffm.to/bethecowboy Follow Mitski: http://mitski.com/ https://mitski.bandcamp.com/ https://twitter.com/mitskileaks https://www.facebook.com/MitskiLeaks https://www.instagram.com/mitskileaks/ https://open.spotify.com/artist/2uYWxilOVlUdk4oV9DvwqK Lyrics: You're growing tired of me You love me so hard and I still can't sleep You're growing tired of me And all the things I don't talk about Sorry, I don't want your touch It's not that I don't want you Sorry, I can't take your touch It's just that I fell in love with a war And nobody told me it ended And it left a pearl in my hand And I roll it around Every night, just to watch it glow Every night, baby, that's where I go Sorry, I don't want your touch It's not that I...
Provided to YouTube by Believe A. Pearl · Sami Yusuf The Centre ℗ Andante Records Released on: 2014-09-12 Music Publisher: Published by Andante Records & Administered by Fairwood Music (UK) Ltd for the World Composer: Sami Yusuf Arranger: Sami Yusuf Author: Will Knox Auto-generated by YouTube.
I died when I heard this on Michelle's podcast What's The Tea. Kinda weird, kinda scary, very funny! XOXOXO *** Reacting to RuPaul and Michelle talking about me on WTT
Australia’s South Sea Pearl Oyster produces the most valuable pearls on Earth. ➡ Subscribe: http://bit.ly/NatGeoWILDSubscribe #NatGeoWILD #Pearls #Oysters About National Geographic Wild: National Geographic Wild is a place for all things animals and for animal-lovers alike. Take a journey through the animal kingdom with us and discover things you never knew before, or rediscover your favorite animals! Get More National Geographic Wild: Official Site: http://bit.ly/NatGeoWILD Facebook: http://bit.ly/NGWFacebook Twitter: http://bit.ly/NGWTwitter Instagram: http://bit.ly/NGWInstagram Formation of a Pearl | Secret Life of Pearls https://youtu.be/m07OvPEoR6g Nat Geo Wild https://www.youtube.com/user/NatGeoWild
Real Pearls From Oyster/开蚌,珍珠蚌,找出冬天藏在塘里静静长大的大河蚌,发现很多淡蓝妖紫珍珠/Freshwater Pearls 希望大家喜欢 !喜欢就订阅 #珍珠 #珍珠蚌 #開河蚌 更多珍珠开蚌视频 https://www.youtube.com/playlist?list=PLBvXSYhZ3FmXmYNiYKkloRVKIfX-TDdWi
unbelievable! I found a beautiful pearl in the ugly geoduck! Pearl queen
A cultured pearl is a pearl created by a mussel farmer or oyster farmer under controlled conditions Credit : Pearl Ise-Shima & SATOUMI Promotion Tourism council & Pearl Falco If you are the owner, send me a comment on the video. I will follow your request as soon as read. Thank you Thank For Watching Noal Farm For more Hot video Please Sub me Here: https://goo.gl/AECnmd And More playlist Noal Farm : https://goo.gl/tYZdNC Noal Sea : https://goo.gl/vvh4j1 #noalfarm #noalharvesting #PearlCultivation
A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusc. Just like the shell of a clam, a pearl is composed of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those currently sold. Imitation pearls are also widely sold in inexpensive jewelry, but the quality of their iridescence is usually very poor and is easily distinguished from that of genuine pearls. Pearls have been harvested and cultivated primarily for use in jewelry, but in the past were also used to adorn clothing. They have also been crushed and used in cosmetics, medicines and paint formulations.