Wednesday, February 27, 2008

Material technologies

OLED technology was first developed at Eastman Kodak Company by Dr. Ching W. Tang using small molecules. The production of small-molecule displays often involves vacuum deposition, which makes the production process more expensive than other processing techniques (see below). Since this is typically carried out on glass substrates, these displays are also not flexible, though this limitation is not inherent to small-molecule organic materials. The term OLED traditionally refers to this type of device, though some are using the term SM-OLED.

Molecules commonly used in OLEDs include organo-metallic chelates (for example Alq3, used in the first organic light-emitting device[13]) and conjugated dendrimers.

Friday, February 22, 2008


Pterosaurs (pterosauros, meaning "winged lizard", often referred to as pterodactyls, from the Greek πτεροδάκτυλος, pterodaktulos, meaning "winged finger" /ˌtɛrəˈdæktɨl/) were flying reptiles of the clade Pterosauria.[1] They existed from the late Triassic to the end of the Cretaceous Period (228 to 65 million years ago). Pterosaurs were the first vertebrates to evolve flight. Their wings were formed by a membrane of skin, muscle, and other tissues stretching from the thorax to a dramatically lengthened fourth finger. Earlier species had long, fully-toothed jaws and long tails, while later forms had a highly reduced tail, and some lacked teeth.

Sunday, February 17, 2008


Sociocybernetics is the science and art of steering societies. Sociocybernetics is an applications of GST and first-and second-order cybernetics to the social sciences. Actually, sociocybernetics is to a large extent based on second-order cybernetics, which was developed precisely because first-order cybernetics had only a limited applicability to the social sciences, where the researcher himself forms part of the subject under investigation, in contrast with the natural sciences.