From Wikipedia, the free encyclopedia

Transient means passing with time. For example, a damped oscillator needs some time after a temporary disturbance to reach the equilibrium again, and after a permanent change in system variables, to reach the new equilibrium.

Contents 1 Acoustics and Audio 1.1 Sonar 2 Astronomy 3 Chemical engineering 4 Civil engineering 5 Computer science -- Programming 6 Computer science -- Operating Systems 7 Electrical and Electronic Engineering 8 Japan 9 User Interface Design of Mobile Phone 10 See also

A transient is a short-duration signal that represents a nonharmonic attack phase of a musical sound or spoken word. It contains a high degree of nonperiodic components and a higher magnitude of high frequencies than the harmonic content of that sound. Transients do not directly depend on the frequency of the tone they initiate. See also onset (audio).

Transient is often used by sonar operators to refer to sudden, unnatural changes in the acoustic environment. This is usually caused by a unnaturally fast moving object. It is most often applied for military use to refer to a probable torpedo entering the water.

A transient astronomical event is a phenomenon that is relatively short-lived. Examples include supernovae, comets, and meteors.

A system is said to be in transient state when a process variable has been changed and the system has not yet reached steady-state. Example: When a chemical reactor is being brought into operation, the concentrations, temperatures, species compositions, and reaction rates are changing with time until operation reaches it nominal process variables.

Transient is used to refer to a water hammer pressure wave. In a pipe network, when a valve or pump is suddenly shut off, a region of high pressure builds up immediately behind the valve/pump. The high-pressure region grows as water, which was initially flowing out of the valve, suddenly becomes stationary. The border of the high-pressure zone is referred to as a pressure wave, or transient.

In the Java programming language, transient is a keyword. When a class member is declared transient, it would not be serialized even if the class to which it belongs is serialized.

In Hibernate, transient describes an object which has been instantiated, but is not associated with a Hibernate session, ie. the object resides in memory but is not being persisted.

For more detail go to: Hibernate.org

Transient also refers to a module that, once loaded into main memory, is expected to remain in memory for a short time. Today, the term is rarely used, and may be obsolete.

In the mid-to-late 1960s, mainframe computers, such as the IBM System/360, had memory sizes from 8 KB to 512 KB. In order to conserve memory, transients were small modules that supported a specific task, and were swapped in and out of memory. The operating system for the 360 had two areas reserved for transients that supported input/output operations. These were referred to as the “logical transient area,” and the “physical transient area.” If an application program, for example, needed to use the printer, transients that supported printing were brought into the transient areas. If an application needed to use tape drives, transients that supported tape drive access were brought into the transient areas.

A transient system is a short-lived oscillation in a system caused by a sudden change of voltage, current, or load. These sudden changes are mostly found as the result of the operation of switching devices. Engineers use voltage regulators and surge suppressors to prevent transients in electricity from affecting delicate equipment.

Transients are also deliberately administered to electronic equipment for testing their performance and resiliance to such interference. International standards define the magnitude and methods used to apply them. Typically refer to EN-61000-4-4, the European standard for Fast Transient testing.

The U.S. version of the standard for EFT is IEEE C37.90. Both of these standards are similar. Which standard you choose is based on the intended market.

A feeling of transience, called Mono no aware, has been important in Japanese culture.

A transient screen is a pop-up screen such as notification or dialog screen in mobile phone. It covers only part of full screen and background will be dimmed. It gives context to user for understanding what is going on background and user can return to background by dismissing the transient screen.

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