![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
Good Morning
Sep. 1st, 2020 08:58 am
Sep. 1st, 2020
Word Of The Day
Sep. 1st, 2020 10:19 amToday's wonderfully magnificent word is -
Chirality
Chirality is a property of asymmetry important in several branches of science. The word chirality is derived from the Greek χειρ (kheir), "hand," a familiar chiral object. An object or a system is chiral if it is distinguishable from its mirror image; that is, it cannot be superimposed onto it. Conversely, a mirror image of an achiral object, such as a sphere, cannot be distinguished from the object. A chiral object and its mirror image are called enantiomorphs (Greek, "opposite forms") or, when referring to molecules, enantiomers. A non-chiral object is called achiral (sometimes also amphichiral) and can be superposed on its mirror image.
The term was first used by Lord Kelvin in 1893 in the second Robert Boyle Lecture at the Oxford University Junior Scientific Club which was published in 1894.
Two enantiomers of a generic amino acid that is chiral
Human hands are perhaps the most universally recognized example of chirality. The left hand is a non-superimposable mirror image of the right hand; no matter how the two hands are oriented, it is impossible for all the major features of both hands to coincide across all axes.
In physics, chirality may be found in the spin of a particle, where the handedness of the object is determined by the direction in which the particle spins. Not to be confused with helicity, which is the projection of the spin along the linear momentum of a subatomic particle, chirality is an intrinsic quantum mechanical property, like spin. Although both chirality and helicity can have left-handed or right-handed properties, only in the massless case are they identical such as with photons. In particular for a massless particle the helicity is the same as the chirality while for an antiparticle they have opposite sign.
The handedness in both chirality and helicity relate to the rotation of a particle while it proceeds in linear motion with reference to the human hands. The thumb of the hand points towards the direction of linear motion whilst the fingers curl into the palm, representing the direction of rotation of the particle (i.e. clockwise and counterclockwise). Depending on the linear and rotational motion, the particle can either be defined by left-handedness or right-handedness. A symmetry transformation between the two is called parity.
Chirality
Chirality is a property of asymmetry important in several branches of science. The word chirality is derived from the Greek χειρ (kheir), "hand," a familiar chiral object. An object or a system is chiral if it is distinguishable from its mirror image; that is, it cannot be superimposed onto it. Conversely, a mirror image of an achiral object, such as a sphere, cannot be distinguished from the object. A chiral object and its mirror image are called enantiomorphs (Greek, "opposite forms") or, when referring to molecules, enantiomers. A non-chiral object is called achiral (sometimes also amphichiral) and can be superposed on its mirror image.
The term was first used by Lord Kelvin in 1893 in the second Robert Boyle Lecture at the Oxford University Junior Scientific Club which was published in 1894.
Two enantiomers of a generic amino acid that is chiral
Human hands are perhaps the most universally recognized example of chirality. The left hand is a non-superimposable mirror image of the right hand; no matter how the two hands are oriented, it is impossible for all the major features of both hands to coincide across all axes.
In physics, chirality may be found in the spin of a particle, where the handedness of the object is determined by the direction in which the particle spins. Not to be confused with helicity, which is the projection of the spin along the linear momentum of a subatomic particle, chirality is an intrinsic quantum mechanical property, like spin. Although both chirality and helicity can have left-handed or right-handed properties, only in the massless case are they identical such as with photons. In particular for a massless particle the helicity is the same as the chirality while for an antiparticle they have opposite sign.
The handedness in both chirality and helicity relate to the rotation of a particle while it proceeds in linear motion with reference to the human hands. The thumb of the hand points towards the direction of linear motion whilst the fingers curl into the palm, representing the direction of rotation of the particle (i.e. clockwise and counterclockwise). Depending on the linear and rotational motion, the particle can either be defined by left-handedness or right-handedness. A symmetry transformation between the two is called parity.
Robert Crumb "R. Crumb's Heroes of Blues, Jazz & Country" (Abrams Comicarts)
This delightful book is a fantastic read for those interested in the history and early pioneers of American music. The book collects three trading card sets that Crumb drew and painted around 1980. Crumb used historical photos to create his works, and true to the "trading card" aesthetic each picture card is accompanied by a paragraph or two about the performers.
The drawings are great, and the info accompanying them is super, especially for those who like to learn about the history of music. You get plenty of excellent biographical info about the featured performer and a lot of "colour". That's what makes this book so fun. I picked it up while listening to Bix Beiderbecke and read "his tone, characterised by a perfect pitch and spare, well-placed notes, was clean and bell-like". It's not a lot of info, but it's the kind of tidbit that makes listening more fun, especially for readers just digging into early American music.
While flipping through the pictures you may be surprised at how many of the bands had women guitarists. Read the entry on Fiddlin' Powers and Family to learn that the guitar was originally "scorned by most rural performers" and "stigmatised in its early days as a polite parlour instrument" that was fit for young girls to play. Now that's a cool little bit of cultural history that I didn't expect to learn from a book of drawings of musicians.
The book is accompanied by a 21 song CD with recordings from 1927-1931 which is a delightful addition to this wonderful hardback book.
It is such a great book to dip into and is highly recommended by yours truly.
This delightful book is a fantastic read for those interested in the history and early pioneers of American music. The book collects three trading card sets that Crumb drew and painted around 1980. Crumb used historical photos to create his works, and true to the "trading card" aesthetic each picture card is accompanied by a paragraph or two about the performers.
The drawings are great, and the info accompanying them is super, especially for those who like to learn about the history of music. You get plenty of excellent biographical info about the featured performer and a lot of "colour". That's what makes this book so fun. I picked it up while listening to Bix Beiderbecke and read "his tone, characterised by a perfect pitch and spare, well-placed notes, was clean and bell-like". It's not a lot of info, but it's the kind of tidbit that makes listening more fun, especially for readers just digging into early American music.
While flipping through the pictures you may be surprised at how many of the bands had women guitarists. Read the entry on Fiddlin' Powers and Family to learn that the guitar was originally "scorned by most rural performers" and "stigmatised in its early days as a polite parlour instrument" that was fit for young girls to play. Now that's a cool little bit of cultural history that I didn't expect to learn from a book of drawings of musicians.
The book is accompanied by a 21 song CD with recordings from 1927-1931 which is a delightful addition to this wonderful hardback book.
It is such a great book to dip into and is highly recommended by yours truly.
In Faversham
Sep. 1st, 2020 09:28 pmAfter a cold start initially it turned out be a lovely sunny warm day. As it was steak Tuesday I went into town sold a few books at Past Sentence and had lunch at Spoons. I had the mixed grill option.
It was delicious as always.
I also took some photos of our picturesque town.
Preston Street
Market Square and West Street
West Street
Ospringe Road - lleading homeward bound.
Looking forward to pay day tomorrow.
It was delicious as always.
I also took some photos of our picturesque town.
Preston Street
Market Square and West Street
West Street
Ospringe Road - lleading homeward bound.
Looking forward to pay day tomorrow.
Just Wondering
Sep. 1st, 2020 10:48 pmWhat was your last dream (that you remember) about?
If you could, would you have a swimming pool in your back yard?
Do you have nicknames for your pets, either current or past?
If you could, would you have a swimming pool in your back yard?
Do you have nicknames for your pets, either current or past?
![[community profile]](https://www.dreamwidth.org/img/silk/identity/community.png){kind=small}