Pack rat

A pack rat or packrat, also called a woodrat, can be any of the species in the rodent genus Neotoma. Pack rats have a rat-like appearance with long tails, large ears and large black eyes. Compared to deer mice, harvest mice and grasshopper mice, pack rats are noticeably larger and are usually somewhat larger than cotton rats.

Species

Rat

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus. Many members of other rodent genera and families are also referred to as rats, and share many characteristics with true rats.

Rats are typically distinguished from mice by their size. Generally, when someone discovers a large muroid rodent, its common name includes the term rat, while if it is smaller, the name includes the term mouse. The muroid family is broad and complex, and the common terms rat and mouse are not taxonomically specific. Scientifically, the terms are not confined to members of the Rattus and Mus genera, for example, the pack rat and cotton mouse.

Species and description

The best-known rat species are the black rat (Rattus rattus) and the brown rat (Rattus norvegicus). The group is generally known as the Old World rats or true rats, and originated in Asia. Rats are bigger than most Old World mice, which are their relatives, but seldom weigh over 500 grams (1.1 lb) in the wild.

Barrett (album)

Barrett is the second and final studio album of new material released by former Pink Floyd frontman Syd Barrett. Recording began at Abbey Road Studios on 26 February 1970, and lasted for 15 sessions until 21 July. The album was produced by Pink Floyd's guitarist David Gilmour, who also contributed on bass guitar, and features contributions from fellow Pink Floyd member Richard Wright on keyboards and previous Madcap contributor Jerry Shirley on drums.

Barrett was released in November 1970 on Harvest in the United Kingdom and Capitol in the United States, but failed to chart in both markets; it was re-released in 1974 as part of Syd Barrett. No singles were issued from the album. It was remastered and reissued in 1993, along with Barrett's other albums − The Madcap Laughs (1970) and Opel (1988) − independently and as part of the Crazy Diamond box set. A newly remastered version was released in 2010.

Background

Vs. (Pearl Jam album)

Vs. is the second studio album by the American rock band Pearl Jam, released on October 19, 1993 through Epic Records. After a relentless touring schedule in support of their 1991 debut album Ten, Pearl Jam headed into the studio in early 1993 facing the challenge of following up the commercial success of its debut. The resulting album, Vs., featured a rawer and more aggressive sound compared with the band's previous release. It was the band's first collaboration with producer Brendan O'Brien.

Pearl Jam decided to scale back its commercial efforts for Vs., including declining to produce music videos for any of the album’s singles. Upon its release, Vs. set the record for most copies of an album sold in its first week, a record it held for five years. Vs. occupied the number one spot on the Billboard 200 chart for five weeks, the longest duration for a Pearl Jam album. The album has been certified seven times platinum by the RIAA in the United States.

Recording

For its second album, Pearl Jam felt the pressures of trying to match the success of its debut album, Ten. In a 2002 interview, guitarist Mike McCready said, "The band was blown up pretty big and everything was pretty crazy."Vs. was the first Pearl Jam album to have production duties handled by producer Brendan O'Brien. It was also the band's first album with drummer Dave Abbruzzese, who had joined the band in August 1991 and toured for the album Ten. Rehearsals for Vs. began in February 1993 at Potatohead Studio in Seattle, Washington. The band then moved to The Site in Nicasio, California in March 1993 to begin recording. Abbruzzese called the tranquil recording site "paradise" while lead vocalist Eddie Vedder said, "I fucking hate it here...I've had a hard time...How do you make a rock record here?"

Air cycle machine

An air cycle machine (ACM) is the refrigeration unit of the environmental control system (ECS) used in pressurized gas turbine-powered aircraft. Normally an aircraft has two or three of these ACM. Each ACM and its components are often referred as an air conditioning pack. The air cycle cooling process uses air instead of a phase changing material such as Freon in the gas cycle. No condensation or evaporation of a refrigerant is involved, and the cooled air output from the process is used directly for cabin ventilation or for cooling electronic equipment.

History

Air cycle machines were first developed in the 19th century for providing chilling on ships. The technique is a reverse Brayton cycle (the thermodynamic cycle of a gas turbine engine) and is also known as a Bell Coleman cycle or "Air-Standard Refrigeration Cycle".

Technical details

The usual compression, cooling and expansion seen in any refrigeration cycle is accomplished in the ACM by a centrifugal compressor, two air-to-air heat exchangers and an expansion turbine.

Playing card

A playing card is a piece of specially prepared heavy paper, thin cardboard, plastic-coated paper, cotton-paper blend, or thin plastic, marked with distinguishing motifs and used as one of a set for playing card games. Playing cards are typically palm-sized for convenient handling.

A complete set of cards is called a pack (UK English), deck (US English), or set (Universal), and the subset of cards held at one time by a player during a game is commonly called a hand. A pack of cards may be used for playing a variety of card games, with varying elements of skill and chance, some of which are played for money (e.g., poker and blackjack games at a casino). Playing cards are also used for illusions, cardistry, building card structures, cartomancy and memory sport.

The front (or "face") of each card carries markings that distinguish it from the other cards in the pack and determine its use under the rules of the game being played. The back of each card is identical for all cards in any particular pack to create an imperfect information scenario. Usually every card will be smooth; however, some packs have braille to allow blind people to read the card number and suit.

Pack (canine)

Pack is a social group of conspecific canids. Not all species of canids form packs; for example, small canids like the red fox do not. Pack size and social behaviour within packs varies across species.

Pack behavior in specific species

African wild dogs (Lycaon pictus) live and hunt in packs. Males assist in raising the pups, and remain with their pack for life, while the females leave their birth pack at about the age of two and a half years old to join a pack with no females. Males outnumber the females in a pack, and usually only one female breeds, with all of the males. African wild dogs are not territorial, and they hunt cooperatively in their packs, running down large game and tearing it apart. They cooperate in caring for wounded and sick pack members as well as the young.

Gray wolves (Canis lupus) usually live in packs which consist of the adult parents and their offspring of perhaps the last 2 or 3 years. The adult parents are usually unrelated and other unrelated wolves may sometimes join the pack.