These are some stamps related to various branches of science.
On them are depicted straight lines, curves and spirals typical
of the world of mathemayics, physics and chemistry.
Visualizzazione post con etichetta Things. Mostra tutti i post
Visualizzazione post con etichetta Things. Mostra tutti i post
sabato 13 novembre 2010
Two mathematicians and their curves on stamps
Gottfried Wilhelm von Leibniz (1646-1716): mathematician, scientist, philosopher.
Coins the term "function": it is necessary to identify the various quantities associated to a curve, including its value, the slope and the perpendicular at one point.
Friedrich Wilhelm Bessel (1784-1846): mathematician, astronomer.
He was the first to determine the distance of a star by measuring the parallax of 61 Cygni in 1838. With his precise observations could categorize the locations of more than 50000 stars and then he introduced mathematical functions now know by his name.
sabato 6 novembre 2010
Straight and curved ... during meals!
Between the main flatware,
spoon and fork have a generally curved shape,
while the knife has a flat and straight blade
mercoledì 3 novembre 2010
From straight to curved
The clip is a small metal object that serves to bind together two parts.
Generally it combines a few sheets of paper in a non-permanent way.
The clip comes from a straight metal wire which is then
curved to get the desired shape.
There is also a machine to produce paperclip. To view this click here
domenica 31 ottobre 2010
giovedì 21 ottobre 2010
Chinese swords 中国刀剑
The opposition of "straight" and "curved": the Chinese swords (中国刀剑)
Five thousand years past, the function of swords has experienced such a transmigrate. Thereinto, the sword almost dominated the vast majority of human warfare. The produce and development of swords are referred to the stimulate of martial need, and also the promote of science technology. In modern times, the function of the swords emerges as artwork even more.
Chinese swords have a long history in China. Stone swords were used in prehistoric times. Bronze swords have been traced back to the bronze daggers of the Western Zhou period, but did not come into common use until the Eastern Zhou period. Bronze long swords suddenly appeared during the mid-third century BC. Later swords were made of iron or steel. These metals were wrought, never cast. Swords commonly reached a length of 70-100 cm, although longer swords have been found. Chinese group all swords into two types, Jian(剑) and Dao(刀). Jian are dual edged and Dao are single edged.
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剑 pinyin: jiàn sword: a straight shape, represents a character of justice
the way of use: to puncture
下图: 越王勾践剑 （Sword of GOU Jian）
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刀 pinyin: dāo sword: a curved shape, always held by some bad person, a hint of wickedness.
the way of use: to chop
明代斩马长刀 (long sword of Ming Dynasty)
长刀 (long sword)
FAN-East Asia
Chinese fan has rich cultural deposits, it is a part of chinese national culture, and closely relates to Buddhism and bamboo culture.
The earliest know Chinese fans are a pair of woven bamboo side-mounted fans from the 2nd century BC. The Chinese character for "fan"(扇) is etymologically derived from a picture of feathers under a roof. The Chinese fixed fan, pien-mien, means "to agitate the air".
The folding fan was invented in Japan around the 6th to 8th century. It was a court fan called the Akomeogi after the court women's dress named Akome. According to the Song Sui (History of Song 宋史), a Japanese monk Chonen offered the folding fans (twenty wooden-bladed fans hiogi (桧扇) and two paper fans kawahori-ogi (蝙蝠扇) to the emperor of China in 988. Later in 11th century, Korean envoys brought along Korean folding fans which were of Japanese origin as gifts to Chinese court.
In China, the folding fan came into fashion during the Ming dynasty between the years of 1368 and 1644, and Hangzhou was a center of folding fan production. The Mai Ogi (or Chinese dancing fan) has ten sticks and a thick paper mount showing the family crest. Chinese painters crafted many fan decoration designs. The slats, of ivory, bone, mica, mother of pearl, sandalwood, or tortoise shell, were carved and covered with paper or fabric.
乌木福寿花鸟翻轮扇骨 檀东铿作品
Folding fans continue to be important cultural symbols and popular tourist souvenirs in East Asia. Geisha of all types (but maiko most often) use folding fans in their fan dances as well.
The two general categories of hand fans:
1. Flat fans(平扇): circular fans, palm-leaf fans, straw fans, feather fans, etc.
2. Folding fans(折扇): silk folding fans, paper folding fans, sandalwood fans, etc.
吕建军 1999年作 拿扇子的姑娘 布面油画
martedì 19 ottobre 2010
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