Shock (mechanics)

A mechanical or physical shock is a sudden acceleration caused, for example, by impact, drop, kick, earthquake, or explosion. Shock is a transient physical excitation.

Shock describes matter subject to extreme rates of force wtr to time. Shock is a vector that has units of an acceleration (rate of change of velocity). The unit g (or g) represents multiples of the acceleration of gravity and is conventionally used.

A shock pulse can be characterised by its peak acceleration, the duration, and the shape of the shock pulse (half sine, triangular, trapezoidal, etc.). The Shock response spectrum is a method for further evaluating a mechanical shock.

Shock measurement

Shock measurement is of interest in several fields such as

Acute stress reaction

Acute stress reaction (also called acute stress disorder, psychological shock, mental shock, or simply shock) is a psychological condition arising in response to a terrifying or traumatic event, or witnessing a traumatic event. It should not be confused with the unrelated circulatory condition of shock, or the concept of shock value.

"Acute stress response" was first described by Walter Cannon in the 1920s as a theory that animals react to threats with a general discharge of the sympathetic nervous system. The response was later recognized as the first stage of a general adaptation syndrome that regulates stress responses among vertebrates and other organisms.

Signs and symptoms

Common symptoms that sufferers of acute stress disorder experience are: numbing; emotional detachment; muteness; derealization; depersonalization; psychogenic amnesia; continued re-experiencing of the event via thoughts, dreams, and flashbacks; and avoidance of any stimulation that reminds them of the event. During this time, they must have symptoms of anxiety, and significant impairment in at least one essential area of functioning. Symptoms last for a minimum of 2 days, and a maximum of 4 weeks, and occur within 4 weeks of the event.

CSI: Miami (season 4)

The fourth season of CSI: Miami premiered on CBS on September 19, 2005 and ended May 22, 2006. The series stars David Caruso and Emily Procter.

Description

With a mole in their midst, Horatio and Calleigh head a team of elite Crime Scene Investigators as they enter their most challenging season yet. Under the roof of a state-of-the-art redesigned crime lab, the dynamic duo investigate a series of crimes including a night-club murder, the death of a pool boy, a cold case rape, and a murder with a double-jeopardy clause, all whilst under the scrutiny of an anonymous mole, and facing a series of cases that threaten the team. With Alexx accused of murdering a child molester, Horatio accused of murdering an innocent woman, Wolfe facing the loss of his eye, and Mac Taylor joining the team when a prisoner transfer goes awry, it's ultimately Delko that faces the greatest loss, when his sister is gunned down by the Mala Noche gang in an attack that will begin a narrative that will recur throughout the next several seasons.

Flashback (Joan Jett album)

Flashback is the eighth studio album, and a compilation album of outtakes and rare songs released by Joan Jett and the Blackhearts. The album was initially released in late 1993 and was reissued in 1998 with a slightly different track listing. The 1998 version dropped five tracks from the 1993 release: "Summertime Blues", "Louie Louie", "Star Star", "Stand Up for Yourself," and "Call Me Lightning" and replaced them with "Real Wild Child (Wild One)", a live version of " Bad Reputation", and "Right 'Til the End", which was only available on the cassette version of the 1993 release. "Call Me Lightning" and "Summertime Blues" were later added as bonus tracks on reissues of Bad Reputation and "Louie Louie" became a bonus track on the reissue of I Love Rock 'N Roll. "Star Star" was included as an unlisted "surprise" track on the 1983 cassette release of Album, but was later removed after the original cassette was pulled from some stores because of non-labelled "explicit" track lyrics. The song was restored on the CD release.

Flashback (psychology)

A flashback, or involuntary recurrent memory, is a psychological phenomenon in which an individual has a sudden, usually powerful, re-experiencing of a past experience or elements of a past experience. These experiences can be happy, sad, exciting, or any other emotion one can consider. The term is used particularly when the memory is recalled involuntarily, and/or when it is so intense that the person "relives" the experience, unable to fully recognize it as memory and not something that is happening in "real time".

History

Flashbacks are the "personal experiences that pop into your awareness, without any conscious, premeditated attempt to search and retrieve this memory". These experiences occasionally have little to no relation to the situation at hand. Flashbacks to those suffering posttraumatic stress disorder can be so disruptive as to seriously affect day-to-day living.

Memory is divided into voluntary (conscious) and involuntary (unconscious) processes that function independently of each other. Theories and research on memory dates back to Hermann Ebbinghaus, who began studying nonsense syllables. Ebbinghaus classified three distinct classes of memory: sensory, short term, and long-term memory.Sensory memory is made up of a brief storage of information within a specific medium (the line you see after waving a sparkler in your field of vision is created by sensory memory).Short term memory is made up of the information currently in use to complete the task at hand.Long term memory is composed of the systems used to store memory over long periods. It enables one to remember what happened two days ago at noon, or who called last night.

Flashback (After School song)

"Flashback" is the fifth Korean single album released by South Korean girl group, After School. The maxi-single marks the first appearance of fifth generation member, Kaeun. This also marks the first comeback since Kahi's official graduation from the group to pursue a solo career.

Background

On April 9, 2012, Pledis revealed that a brand new member would be added to the group. The following day, the member was officially revealed to be Kaeun and details regarding a Korean comeback in June were revealed.

On June 11, 2012, the first teaser image, featuring all eight members, for the comeback was released to the public via Pledis Entertainment's website. Later that day the title of the maxi-single was revealed, "Flashback", along with the tracklist. The following day, a second teaser picture was released featuring third generation member Lizzy. The photo showed that the group are returning to their sexy concept as Lizzy was seen wearing black mesh clothing and was in a seductive, sultry pose which is similar to the concept the group had when they debuted. A day after Lizzy's teaser photo, Uie's photo was revealed, followed by Nana & Raina, Jungah, Juyeon, and lastly E-Young & Kaeun. Although it was speculated that Nana would become the leader, Pledis announced the empty leader position with the graduation of Kahi will be taken on by Jungah.