Year 2038 problem

The Year 2038 problem is an issue for computing and data storage situations in which time values are stored or calculated as a signed 32-bit integer, and this number is interpreted as the number of seconds since 00:00:00 UTC on 1 January 1970 ("the epoch"). Such implementations cannot encode times after 03:14:07 UTC on 19 January 2038 (21 years' time), a problem similar to but not entirely analogous to the "Y2K problem" (also known as the "Millennium Bug"), in which 2-digit values representing the number of years since 1900 could not encode the year 2000 or later. Most 32-bit Unix-like systems store and manipulate time in this "Unix time" format, so the year 2038 problem is sometimes referred to as the "Unix Millennium Bug" by association.

Technical cause

The latest time that can be represented in Unix's signed 32-bit integer time format is 03:14:07 UTC on Tuesday, 19 January 2038 (2,147,483,647 seconds after 1 January 1970). Times beyond that will "wrap around" and be stored internally as a negative number, which these systems will interpret as having occurred on 13 December 1901 rather than 19 January 2038. This is caused by integer overflow. The counter "runs out" of usable bits, "increments" the sign bit instead, and reports a maximally negative number (continuing to count up, toward zero). Resulting erroneous calculations on such systems are likely to cause problems for users and other relying parties.

Group

Group may refer to:

Groups of people

In science and technology

In mathematics

In chemistry

In computing and the internet

Other uses in science and technology

Other uses

Stratigraphic unit

A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".

Lithostratigraphic units

Sequences of sedimentary and volcanic rocks are subdivided on the basis of their lithology. Going from smaller to larger in scale, the main units recognised are Bed, Member, Formation, Group and Supergroup.

Bed

A bed is a lithologically distinct layer within a member or formation and is the smallest recognisable stratigraphic unit. These are not normally named, but may be in the case of a marker horizon.

Member

A member is a named lithologically distinct part of a formation. Not all formations are subdivided in this way and even where they are recognized, they may only form part of the formation.

1994 Group

The 1994 Group was a coalition of smaller research-intensive universities in the United Kingdom, founded in 1994 to defend these universities' interests following the creation of the Russell Group by larger research-intensive universities earlier that year. The 1994 Group originally represented seventeen universities, rising to nineteen, and then dropping to eleven. The Group started to falter in 2012, when a number of high performing members left to join the Russell Group. The 1994 Group ultimately dissolved in November 2013.

Role

The group sought "to represent the views of its members on the current state and the future of higher education through discussions with the government, funding bodies, and other higher education interest groups" and "[made] its views known through its research publications and in the media".

University Alliance, million+, GuildHE and the Russell Group were its fellow university membership groups across the UK higher education sector.

Members

1994 Group position in league tables

Portland sheep

The Portland is a sheep breed that takes its name from the Isle of Portland in Dorset, England. This breed is raised primarily for meat.

History

Once common all over Dorset, the breed was once one of the rarest in Britain and is still at risk. It nearly became extinct in the 1970s, but has now recovered through efforts of dedicated breeders and the help of the Rare Breeds Survival Trust. It is now listed as "at risk", being a minority breed. As one of the very old tan-faced breeds native to heathlands, the Portland was a primary contributor to the Dorset breed.

Fancy's Family Farm, a community farm on the Isle of Portland is home to the only flock of the Portland Sheep breed on the island.

Characteristics

The Portland is a small sheep, with a cream fleece and golden tan face and legs. Both sexes are horned: in the adult male the horns are heavy and form double spirals; in the female the horns are lighter and shorter, being a single crescent shape. The horns are cream-coloured, often having one or more thin black lines running along the horn lengthways. Lambs are born with a foxy-red coat which changes in the first few months to a creamy white.

Portland (shipwreck)

PS Portland was a large side-wheel paddle steamer, an ocean-going steamship with side-mounted paddlewheels. She was built in 1889 for passenger service between Boston, Massachusetts and Portland, Maine. She is best known as the namesake of the infamous Portland Gale of 1898, a massive blizzard that struck coastal New England, claiming the lives of over 400 people and more than 150 vessels.

Portland sank off of Cape Ann with all hands, the exact number of which cannot be determined, as the only known passenger list went down with the ship. Initial newspaper accounts at the time estimated the loss as from 99 to 118 persons. The bodies of only 16 crew and 35 passengers were ever recovered, but present-day estimates are that the Portland was carrying, in total, from 193 to 245 persons, including 63 crew. Her loss represented New England's greatest steamship disaster prior to the year 1900.

Construction and design

Portland's wooden hull was built by the Bath Iron Works in Bath, Maine. The 1200-horsepower vertical-beam steam engine was constructed by the Portland Company, with a bore, or cylinder diameter, measuring 5 ft 2 in (1.57 m) across, together with a 12 ft (3.7 m) stroke. The ship's two iron boilers were constructed at the Bath Iron Works, also in Bath, Maine.

Portland, Oregon

Portland (/ˈpɔːrtlənd/) is the largest city in the U.S. state of Oregon and the seat of Multnomah County. It is located in the Willamette Valley region of the Pacific Northwest, at the confluence of the Willamette and Columbia rivers. The city covers 145 square miles (376 km²) and had an estimated population of 619,360 in 2014, making it the 28th most populous city in the United States. Approximately 2,348,247 people live in the Portland metropolitan statistical area (MSA), the 24th most populous MSA in the United States. Its Combined Statistical Area (CSA) ranks 17th with a population of 3,022,178. Roughly 60 percent of Oregon's population resides within the Portland metropolitan area.

Named after the city in Maine, Portland was settled in the 1830s near the end of the Oregon Trail. Its water access provided convenient transportation of goods, and the timber industry was a major force in the city's early economy. At the turn of the 20th century, the city had developed a reputation as one of the most dangerous port cities in the world, a hub for organized crime and racketeering. After the city's economy experienced an industrial boom during World War II, its hard-edged reputation began to dissipate. Beginning in the 1960s, Portland became noted for its growing liberal political values, and the city has earned a reputation as a bastion of counterculture, a view which has proceeded into the 21st century. According to a 2009 Pew Research Center study, Portland ranks as the 8th most popular American city, based on where people want to live.