Combination lock

Termination procedures (all listed implementation features must be present) Procedures for the ending of an employee s employment or an intemal/extemal user s access. Combination locks changed Removal from access lists Removal of user account(s) Return of keys, tokens, or cards that allow access... 

The fact that the mutation-selection process has two parts. .. is brought vividly by Richard Dawkins in his book The Blind Watchmaker. Imagine a device that is something like a combination lock. It is composed of a series of disks placed side by side. On the edge of each disk, the twenty-six letters of the alphabet appear. The disks can be spun separately so that different sequences of letters may appear in the viewing window. 

A lock is a mechanical device for securing a door, chest, or other receptacle so that it can only be opened by an authorized person. Most locks are opened by a key which is placed in the lock and turned. Combination locks do not use a key but rather have a cylinder that is turned to certain stops. Today, many hotels use special plastic cards with magnetic strips as keys which cause a door to open electronically when inserted in a slot near the doorknob. 

Keyless combination locks have been known since the sixteenth century. They contain a series of rings or tumblers threaded on a spindle which must be turned from the outside in such a way that all the rings line up. These rings usually have numbers or letters on them, and if a lock has three rings with 100 numbers on each, there are approximately one million possible combinations, only one of which will open the lock. Combination locks have no keyholes in which to pry or insert explosives, and they became popular for safes and vaults. They are often used in conjunction with time-lock devices, preventing a safe or door from being opened during certain hours even if the correct combination is used. 

Altogether, today s mechanical locks are variations of the three basic types of locks the early Bramah lever, the Yale cylinder, and the combination lock. Sometimes a single lock may combine some features of each, such as a Finnish combination lock whose rings must be moved to the proper position by a the turn of a key. In the United... 

Combination lock—One which is operated by a rotating dial by which certain numbers or letters in a particular order, after a given number of turns in the prescribed direction, are brought opposite the setting mark, after which the lock can be opened. 

The heavy chest under her bed was one article which hadn t moved. Carmitha knelt down and spun the combination lock. 

Entrance to the gowning area should be controlled so that there is no unauthorized entry of persoimel. The control can be a button-type combination lock. The gowning area can be entered through an air shower in order for loose particulates to be removed. 

Metals such as copper, iron, or a combination of the two, usually modified with tin, bismuth, and/or lead ate used as binders of sintered friction materials where deformation under the high forming pressure is requited to lock together the property modifiers within a matrix. Metals such as copper, iron, zinc, aluminum, and occasionally lead are also used as friction modifiers. 

Combined construction, process-related, and ventilation measures include air locks between two zones (Fig. 7A09f) and process equipment enclosures with air exhaust from the enclosures (Fig, 7.109g). 

FIGURE 7.110 (o) Contaminant movement between two building zones with diFFerent celling helghu due to the combined effea of unbalanced mechanical systems and the "stack" effect (b) Prevention of contaminant movement between two zones using an air lock."... 

Since methane is almost always a byproduct of organic decay, it is not surprising that vast potential reserves of methane have been found trapped in ocean floor sediments. Methane forms continually by tiny bacteria breaking down the remains of sea life. In the early 197Qs it was discovered that this methane can dissolve under the enormous pressure and cold temperatures found at the ocean bottom. It becomes locked in a cage of water molecules to form a methane hydrate (methane weakly combined chemically with water). This "stored" methane is a resource often extending hundreds of meters down from the sea floor. 

Christensen-Mason Jar. (See Figure 4-172 and Table 4-103 [57].) This is a combination tool, offering possibility to jar upwards hydraulically and to bump downward mechanically. The jar is equipped with a special releasing (locking) mechanism, so that the jar cannot be fired upwards until the locking system has been released. It has a 6-in. jarring stroke upwards and 30-in. for downward bumping [57]. 

Sodium carbonate is used in detergent formulas as a water softener, to lock up calcium and magnesium from the water. Calcium and magnesium would otherwise combine with the soap or detergents and form an insoluble scum that would stick to the clothes and the washing machine. 

Liquid crystal sounds like a contradiction. Liquids are fluid, their molecules continually changing places in a manner that is not particularly well organized. Crystals are immobile, their molecules locked into fixed positions that form regular patterns. Yet, not only does this unusual combination of fluidity and regular patterns exist, it plays important roles in biological organisms. 

Schabitz WR, Li F, Irie K, Sandage Jr, BW, Locke KW, Fisher M. Synergistic effects of a combination of low-dose basic fibroblast growth factor and citicoline after temporary experimental focal ischemia. Stroke 1999 30 427 31 [discussion 431 22]. 

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