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πŸ”— CS Alert (1890)

πŸ”— Ships

CS Alert, or HMTS Alert, was a cable-laying ship that had a significant role in World War I. She was launched in 1871 for the Submarine Telegraph Company with the name The Lady Carmichael. In 1890 the ship was acquired by the General Post Office (GPO) as part of the nationalisation of the British telegraph network. At the outbreak of World War I, Alert was immediately dispatched to cut German telegraph cables in the English Channel, seriously damaging Germany's ability to securely communicate with the rest of the world. Alert was taken out of service as a cable ship in 1915 but her cable-handling gear was retained for fitting on her replacement. After the war, she worked as a merchant ship under various names, finally being wrecked at Redcar under the name Norham in 1932.

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πŸ”— Superman 64

πŸ”— Video games πŸ”— Comics πŸ”— Comics/Superman

Superman: The New Superman Adventures, commonly referred to as Superman 64, is an action-adventure game developed and published by Titus Interactive for the Nintendo 64 and based on the television series Superman: The Animated Series. Released in North America on May 31, 1999, and in Europe on July 23, 1999, it is the first 3D Superman game.

In the game, Lex Luthor has trapped Jimmy Olsen, Lois Lane, and Professor Hamilton in a virtual reality version of Metropolis that he created with the help of Brainiac, leaving it up to Superman to save them and break apart the virtual world. The game shifts between outdoor levels where the player flies through rings while saving civilians, and indoor levels where the player looks for access cards, activates computers, and fights villains such as Brainiac, Mala, Metallo, Darkseid, and Parasite.

The development of Superman began in 1997 and was largely hampered by constraints between Titus and the game's licensors, Warner Bros. and DC Comics, leaving little room for polishing the gameplay. BlueSky Software attempted to redo the game for the PlayStation, but this version was ultimately canceled, as Titus's license with Warner Bros. had expired by the time it was completed. With three E3 presentations and positive press coverage before its release, Superman 64 was released to strong sales and positive consumer reception; however, critical reviews were extremely negative, claiming it to be one of the worst video games ever made and panning its unresponsive controls, technical flaws, repetitive gameplay, overuse of distance fog, and poor graphics.

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πŸ”— ST3000DM001

πŸ”— Computing

The ST3000DM001 is a hard disk drive released by Seagate Technology in 2011 as part of the Seagate Barracuda series. It has a capacity of 3 terabytes (TB) and a spindle speed of 7200Β RPM. This particular drive model was reported to have unusually high failure rates, approximately 5.7 times higher fail rates in comparison to other 3 TB drives.

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πŸ”— United States National Radio Quiet Zone

πŸ”— United States πŸ”— United States Public Policy πŸ”— Virginia πŸ”— United States/West Virginia

The National Radio Quiet Zone (NRQZ) is a large area of land in the United States designated as a radio quiet zone, in which radio transmissions are heavily restricted by law to facilitate scientific research and the gathering of military intelligence. Roughly half of the zone is located in the Blue Ridge Mountains of west-central Virginia while the other half is the Allegheny Mountains of east-central West Virginia; a small part of the zone is in the southernmost tip of the Maryland panhandle.

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πŸ”— Abu Fanous

πŸ”— Folklore πŸ”— Saudi Arabia

Abu Fanous (Arabic: أبو ΩΨ§Ω†ΩˆΨ³) is a mysterious light phenomenon observed by travellers in the Arabian desert, mainly the Eastern Province, Riyadh, Najd, Rub' al-Khali and the Gulf. It appears at dawn or during the night as an orb or headlight that moves unpredictably and lures people into the desert, then vanishes without a trace.

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πŸ”— Valid Email Addresses

πŸ”— Technology πŸ”— Internet πŸ”— Computing πŸ”— Computing/Networking

An email address identifies an email box to which email messages are delivered. A wide variety of formats were used in early email systems, but only a single format is used today, following the specifications developed for Internet mail systems since the 1980s. This article uses the term email address to refer to the addr-spec defined in RFC 5322, not to the address that is commonly used; the difference is that an address may contain a display name, a comment, or both.

An email address such as John.Smith@example.com is made up of a local-part, an @ symbol, then a case-insensitive domain. Although the standard requires the local part to be case-sensitive, it also urges that receiving hosts deliver messages in a case-independent fashion, e.g., that the mail system at example.com treat John.Smith as equivalent to john.smith; some mail systems even treat them as equivalent to johnsmith. Mail systems often limit their users' choice of name to a subset of the technically valid characters, and in some cases also limit which addresses it is possible to send mail to.

With the introduction of internationalized domain names, efforts are progressing to permit non-ASCII characters in email addresses.

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πŸ”— A*

πŸ”— Computing πŸ”— Computer science πŸ”— Mathematics

A* (pronounced "A-star") is a graph traversal and path search algorithm, which is often used in computer science due to its completeness, optimality, and optimal efficiency. One major practical drawback is its O ( b d ) {\displaystyle O(b^{d})} space complexity, as it stores all generated nodes in memory. Thus, in practical travel-routing systems, it is generally outperformed by algorithms which can pre-process the graph to attain better performance, as well as memory-bounded approaches; however, A* is still the best solution in many cases.

Peter Hart, Nils Nilsson and Bertram Raphael of Stanford Research Institute (now SRI International) first published the algorithm in 1968. It can be seen as an extension of Edsger Dijkstra's 1959 algorithm. A* achieves better performance by using heuristics to guide its search.

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  • "A*" | 2019-08-10 | 50 Upvotes 6 Comments

πŸ”— The King in Yellow

πŸ”— Novels πŸ”— Books πŸ”— Novels/Short story πŸ”— Horror

The King in Yellow is a book of short stories by American writer Robert W. Chambers, first published by F. Tennyson Neely in 1895. The British first edition was published by Chatto & Windus in 1895 (316 pages).

The book contains nine short stories and a sequence of poems; while the first stories belong to the genres of supernatural horror and weird fiction, The King in Yellow progressively transitions towards a more light-hearted tone, ending with romantic stories devoid of horror or supernatural elements. The horror stories are highly esteemed, and it has been described by critics such as E. F. Bleiler, S. T. Joshi, and T. E. D. Klein as a classic in the field of the supernatural. Lin Carter called it "an absolute masterpiece, probably the single greatest book of weird fantasy written in this country between the death of Poe and the rise of Lovecraft", and it was an influence on Lovecraft himself.

The book is named for the eponymous play within the stories which recurs as a motif through the first four stories, a forbidden play which induces madness in those who read it.

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πŸ”— Prowords

πŸ”— Telecommunications

Procedure words or prowords are words or phrases limited to radio telephone procedure used to facilitate communication by conveying information in a condensed standard verbal format. Prowords are voice versions of the much older prosigns for Morse code first developed in the 1860s for Morse telegraphy, and their meaning is identical. The NATO communications manual ACP-125 contains the most formal and perhaps earliest modern (post-WW-II) glossary of procedure words, but its definitions have been adopted by many other organizations, including the United Nations Development Programme, the U.S. Coast Guard, the Rhode Island Department of Emergency Management, Civil Air Patrol, Military Auxiliary Radio System, and others.

Procedure words are one of several structured parts of radio voice procedures, including Brevity codes and Plain language radio checks. The vast majority of the brevity codes from the U.S. military's Multiservice tactical brevity code are inappropriate for any civilian use, owing to their focus on large weapons (missiles, etc.) and other war-related issues. However, a few are used frequently enough in media to be memorable, including ABORT, BOGEY, BANDIT, FEET WET, FEET DRY, NEGATIVE CONTACT, and NO JOY.

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πŸ”— Dadda Multiplier

πŸ”— Computing πŸ”— Computing/Computer hardware

The Dadda multiplier is a hardware binary multiplier design invented by computer scientist Luigi Dadda in 1965. It uses a selection of full and half adders to sum the partial products in stages (the Dadda tree or Dadda reduction) until two numbers are left. The design is similar to the Wallace multiplier, but the different reduction tree reduces the required number of gates (for all but the smallest operand sizes) and makes it slightly faster (for all operand sizes).

Dadda and Wallace multipliers have the same three steps for two bit strings w 1 {\displaystyle w_{1}} and w 2 {\displaystyle w_{2}} of lengths β„“ 1 {\displaystyle \ell _{1}} and β„“ 2 {\displaystyle \ell _{2}} respectively:

  1. Multiply (logical AND) each bit of w 1 {\displaystyle w_{1}} , by each bit of w 2 {\displaystyle w_{2}} , yielding β„“ 1 β‹… β„“ 2 {\displaystyle \ell _{1}\cdot \ell _{2}} results, grouped by weight in columns
  2. Reduce the number of partial products by stages of full and half adders until we are left with at most two bits of each weight.
  3. Add the final result with a conventional adder.

As with the Wallace multiplier, the multiplication products of the first step carry different weights reflecting the magnitude of the original bit values in the multiplication. For example, the product of bits a n b m {\displaystyle a_{n}b_{m}} has weight n + m {\displaystyle n+m} .

Unlike Wallace multipliers that reduce as much as possible on each layer, Dadda multipliers attempt to minimize the number of gates used, as well as input/output delay. Because of this, Dadda multipliers have a less expensive reduction phase, but the final numbers may be a few bits longer, thus requiring slightly bigger adders.

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