Helix
A helix (pl: helixes or helices) is a type of smooth space curve, i.e. a curve in three-dimensional space. It has the property that the tangent line at any point makes a constant angle with a fixed line called the axis. Examples of helices are coil springs and the handrails of spiral staircases. A "filled-in" helix – for example, a spiral ramp – is called a helicoid. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word helix comes from the Greek word ἕλιξ, "twisted, curved".
Types
Helices can be either right-handed or left-handed. With the line of sight along the helix's axis, if a clockwise screwing motion moves the helix away from the observer, then it is called a right-handed helix; if towards the observer, then it is a left-handed helix. Handedness (or chirality) is a property of the helix, not of the perspective: a right-handed helix cannot be turned to look like a left-handed one unless it is viewed in a mirror, and vice versa.
Phelix
Phelix is a high-speed stream cipher with a built-in single-pass message authentication code (MAC) functionality, submitted in 2004 to the eSTREAM contest by Doug Whiting, Bruce Schneier, Stefan Lucks, and Frédéric Muller. The cipher uses only the operations of addition modulo 232, exclusive or, and rotation by a fixed number of bits. Phelix uses a 256-bit key and a 128-bit nonce, claiming a design strength of 128 bits. Concerns have been raised over the ability to recover the secret key if the cipher is used incorrectly.
Performance
Phelix is optimised for 32-bit platforms. The authors state that it can achieve up to eight cycles per byte on modern x86-based processors.
FPGA Hardware performance figures published in the paper "Review of stream cipher candidates from a low resource hardware perspective" are as follows:
Helix
Phelix is a slightly modified form of an earlier cipher, Helix, published in 2003 by Niels Ferguson, Doug Whiting, Bruce Schneier, John Kelsey, Stefan Lucks, and Tadayoshi Kohno; Phelix adds 128 bits to the internal state.
Helix (newspaper)
After a series of organizational meetings held at the Free University of Seattle involving a large and eclectic group including Paul Dorpat, Tom Robbins, Lorenzo Milam and others from KRAB-FM, John Ullman of the Seattle Folklore Society, Unitarian minister Paul Sawyer, and many others, the Helix first appeared on March 23, 1967. A member of both the Underground Press Syndicate and the Liberation News Service, it published a total of 125 issues (sometimes as a weekly, sometimes as a biweekly) before folding on June 11, 1970. The first issue was produced by Paul Dorpat with $200 in borrowed capital, out of a rented storefront on Roosevelt Way NE. After being turned down by the first printers they approached, they found a printer in Ken Monson, communications director of the International Association of Machinists local, who had recently acquired a printing press. 1500 copies were printed of the first issue. By the fourth biweekly issue sales had reached 11,000 copies. After the first two issues a "split-font" rainbow effect was sometimes used to print psychedelically colorful front covers; issues averaged 24 pages, with illustrations and graphics clipped from old magazines and having little to do with the adjoining copy crammed into the interior pages.
Eden, Wisconsin (disambiguation)
Eden is the name of some places in the U.S. state of Wisconsin:
Dorothy Johnston
Dorothy Johnston (1948) is an Australian author of both crime and literary fiction. She has published novels, short stories and essays.
Born in Geelong, Victoria, Australia, Johnston trained as a teacher at the University of Melbourne and later worked as a researcher in the education field. She lived in Canberra from 1979 to 2008, and currently lives in Ocean Grove, Victoria (Australia). She is a former President of Canberra PEN and a founding member of the Seven Writers' Group.
Awards
Bibliography
Novels
Short stories
Eden (TV channel)
Eden is a digital television channel broadcasting factual content in the United Kingdom and Ireland as part of the UKTV network of channels. The channel originally launched on 8 March 2004 and relaunched in its current format on 27 January 2009. The channel is available on Sky, Virgin Media, Smallworld Cable, TalkTalk Plus TV and BT TV, but not on the digital terrestrial supplier Freeview.
History
The channel launched on 8 March 2004 as UKTV Documentary, showing factual documentaries, mainly taken from the BBC archives, on a variety of subjects if not covered by another channel in the UKTV network, such as Jacob Bronowski's The Ascent of Man. Much of this programming had come from the former UKTV channel UK Horizons, which had closed down the day before and which the channel, along with UKTV People, replaced. UKTV Documentary occupied the same broadcasting slot as UK Horizons.
On 9 October 2008, UKTV announced plans to rebrand UKTV Documentary and UKTV People in early 2009. The news came just two days after UKTV's entertainment channels were rebranded to Watch, Gold and Alibi. They announced that UKTV Documentary would be rebranded as Eden and this rebrand took place on 26 January 2009. As part of the rebrand, the channels programming output changed from all documentaries to primarily documentaries focusing on the natural environment. All other documentaries were transferred to UKTV History or UKTV People, depending on their subject matter.
Podcasts:
