Safe mode is an operating mode of a modern spacecraft during which all non-essential systems are shut down and only essential functions such as thermal management, radio reception and attitude control are active.
Safe mode is entered automatically upon the detection of a predefined operating condition or event that may indicate loss of control or damage to the spacecraft. Usually the trigger event is a system failure or detection of operating conditions considered dangerously out of the normal range. Cosmic rays penetrating spacecraft electrical systems can create false signals or commands and thus cause a trigger event. The central processor electronics are especially prone to such events. Another trigger is the lack of a received command within a given time window. Lack of received command can come from hardware failures or missprogramming the spacecraft, the Viking_1 lander for example.
The process of entering safe mode, sometimes referred to as safing, involves a number of immediate physical actions taken to prevent damage or complete loss. Power is removed from non-essential subsystems. Regaining attitude control, if lost, is the highest priority because it is necessary to maintain thermal balance and proper illumination of the solar panels. A tumbling or cartwheeling spacecraft can quickly roast, freeze or exhaust its battery power and be lost forever.
A safe (also called a strongbox or coffer) is a secure lockable box used for securing valuable objects against theft and/or damage from fire. A safe is usually a hollow cuboid or cylinder, with one face being removable or hinged to form a door. The body and door may be cast from metal (such as steel) or formed out of plastic through blow molding. Bank teller safes typically are secured to the counter, have a slit opening for dropping valuables into the safe without opening it, and a time-delay combination lock to foil robbers. One significant distinction between types of safes is whether the safe is secured to a wall or structure or if it can be moved around. A less secure version (only suitable for petty cash) is usually called a cash-box.
In 1835, English inventors Charles Chubb and Jeremiah Chubb in Wolverhampton, England, received a patent for a burglar-resisting safe and began a production of safes. The Chubb brothers had produced locks since 1818. Chubb Locks was an independent company until 2000 when it was sold to Assa Abloy.
Safe is the second EP by Kittie, a Canadian heavy metal all-women band from London, Ontario. It was released in 2002. It is dedicated "In Loving Memory of Dave Williams". The EP sold 25,000 units in the United States. It received very little promotion, only appearing on 2 major rock/heavy metal magazines.
Al-Safa and Al-Marwah (Safa and Marwah) (Arabic: الصفا Aṣ-Ṣafā, المروة al-Marwah) are two small hills now located in the Masjid al-Haram in Mecca, Saudi Arabia between which Muslims travel back and forth seven times during the ritual pilgrimages of Hajj and Umrah.
In Islamic tradition, Ibrahim (Abraham) was commanded by God to leave his wife Hajar (Hagar) and their infant son alone in the desert between Al-Safa and Al-Marwah with only basic provisions to test their faith. When their provisions were exhausted, Hagar went in search of help or water. To make her search easier and faster, she went alone, leaving the infant Ismail (Ishmael) on the ground.
She first climbed the nearest hill, Al-Safa, to look over the surrounding area. When she saw nothing, she then went to the other hill, Al-Marwah, to look around. While Hagar was on either hillside, she was able to see Ismael and know he was safe. However, when she was in the valley between the hills she was unable to see her son, and would thus run whilst in the valley and walk at a normal pace when on the hillsides. Hagar travelled back and forth between the hills seven times in the scorching heat before returning to her son. When she arrived, she found that a spring had broken forth from where the Angel Jibreel hit the ground with his wing. This spring is now known as the Zamzam Well, and was revealed by the angel of God as both sustenance and a reward for Hagar's patience.
In user interface design, a mode is a distinct setting within a computer program or any physical machine interface, in which the same user input will produce perceived different results than it would in other settings. The best-known modal interface components are probably the Caps lock and Insert keys on the standard computer keyboard, both of which put the user's typing into a different mode after being pressed, then return it to the regular mode after being re-pressed.
An interface that uses no modes is known as a modeless interface. Modeless interfaces intend to avoid mode errors by making it impossible for the user to commit them.
A precise definition is given by Jef Raskin in his book The Humane Interface:
"An human-machine interface is modal with respect to a given gesture when (1) the current state of the interface is not the user's locus of attention and (2) the interface will execute one among several different responses to the gesture, depending on the system's current state." (Page 42).
In literature, a mode is an employed method or approach, identifiable within a written work. As descriptive terms, form and genre are often used inaccurately instead of mode; for example, the pastoral mode is often mistakenly identified as a genre. The Writers Web site feature, A List of Important Literary Terms, defines mode thus:
In his Poetics, the ancient Greek philosopher Aristotle uses 'mode' in a more specific sense. Kinds of 'poetry' (the term includes drama, flute music, and lyre music for Aristotle), he writes, may be differentiated in three ways: according to their medium of imitation, according to their objects of imitation, and according to their mode or 'manner' of imitation (section I). "For the medium being the same, and the objects the same, the poet may imitate by narration—in which case he can either take another personality as Homer does, or speak in his own person, unchanged—or he may present all his characters as living and moving before us" (section III). According to this definition, 'narrative' and 'dramatic' are modes of fiction:
This article presents a list of commands used by DOS operating systems, especially as used on x86-based IBM PC compatibles (PCs). Other DOS operating systems are not part of the scope of this list.
In DOS, many standard system commands were provided for common tasks such as listing files on a disk or moving files. Some commands were built into the command interpreter, others existed as external commands on disk. Over the several generations of DOS, commands were added for the additional functions of the operating system. In the current Microsoft Windows operating system, a text-mode command prompt window, cmd.exe, can still be used.
The command interpreter for DOS runs when no application programs are running. When an application exits, if the transient portion of the command interpreter in memory was overwritten, DOS will reload it from disk. Some commands are internal — built into COMMAND.COM; others are external commands stored on disk. When the user types a line of text at the operating system command prompt, COMMAND.COM will parse the line and attempt to match a command name to a built-in command or to the name of an executable program file or batch file on disk. If no match is found, an error message is printed, and the command prompt is refreshed.