Variable-yield Investments - translation to αραβικά
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Variable-yield Investments - translation to αραβικά

Dial-a-yield; Dial-a-nuke; Variable yield nuclear device; Variable yield nuclear weapon; Variable-yield

Variable-yield Investments      
استثمارات بعوائد متغيرة
Actual yield         
  • thumb
ANY OF SEVERAL RELATIVE AND ABSOLUTE MEASURES OF THE AMOUNT OF DESIRED PRODUCT OBTAINED IN A CHEMICAL REACTION
Percent yield; Reaction yield; Theoretical yield; Molar yield; Chemical yield; Yield (chemical); Percentage Yield; Relative yield; Experimental yield; % yield; Percentage yield; Actual yield
عاند فـعلى
Yield to maturity         
THE DISCOUNT RATE AT WHICH THE SUM OF ALL FUTURE CASH FLOWS FROM A BOND (COUPONS AND PRINCIPAL) IS EQUAL TO THE PRICE OF THE BOND
Yield to Worst; Yield to Maturity; Redemption yield; Book yield; Subscriber Yield
عائد عند الاستحقاق

Ορισμός

environment variable
<programming, operating system> A variable that is bound in the current environment. When evaluating an expression in some environment, the evaluation of a variable consists of looking up its name in the environment and substituting its value. Most programming languages have some concept of an environment but in Unix shell scripts it has a specific meaning slightly different from other contexts. In shell scripts, environment variables are one kind of shell variable. They differ from local variables and command line arguments in that they are inheritted by a child process. Examples are the PATH variable that tells the shell the file system paths to search to find command executables and the TZ variable which contains the local time zone. The variable called "SHELL" specifies the type of shell being used. These variables are used by commands or shell scripts to discover things about the environment they are operating in. Environment variables can be changed or created by the user or a program. To see a list of environment variables type "setenv" at the csh or tcsh prompt or "set" at the sh, bash, jsh or ksh prompt. In other programming languages, e.g. functional programming languages, the environment is extended with new bindings when a function's parameters are bound to its {actual arguments} or when new variables are declared. In a block-structured procedural language, the environment usually consists of a linked list of activation records. (1999-01-26)

Βικιπαίδεια

Variable yield

Variable yield, or dial-a-yield, is an option available on most modern nuclear weapons. It allows the operator to specify a weapon's yield, or explosive power, allowing a single design to be used in different situations. For example, the Mod-10 B61 bomb had selectable explosive yields of 0.3, 5, 10 or 80 kilotons, depending on how the ground crew set a dial inside the casing when it was loaded onto an aircraft.

Variable yield technology has existed since at least the late 1950s. Examples of variable yield weapons include the B61 nuclear bomb family, B83, B43, W80, W85, and WE177A warheads.

Most modern nuclear weapons are Teller–Ulam design type thermonuclear weapons, with a fission primary stage and a fusion secondary stage which is collapsed by the energy from the primary. These offer at least three methods to vary yield:

  • Varying primary yield by boosting with fusion, using small amounts of deuterium / tritium (DT) gas inside the primary fission bomb to increase its yield by supplying additional neutrons from DT fusion at the beginning of the fission process. Typically, the gas is injected a few seconds before detonation and the amount used can be preset – e.g., zero, 25%, 50%, or all of the gas.
  • Changing the primary yield by varying the timing or use of external neutron initiators (ENIs). These are small particle accelerators that cause a brief fusion reaction by accelerating deuterium into a tritium target (or potentially vice versa), producing a short pulse of energetic neutrons. Precise timing of the ENI pulse as the nuclear primary's pit is collapsing can significantly affect yield, and the rate of neutron injection can also be controlled.
  • Shutting down the thermonuclear secondary, either by firing the primary at low enough yield that it does not compress the secondary sufficiently to ignite, or by blocking energy transport inside the warhead briefly as the primary is firing using shutters or a similar mechanism. If the primary's energy starts to disperse through the radiation case before being focused on the secondary then the secondary will likely never detonate.

All current British nuclear warheads incorporate variable yield technology as standard.