R Value Wikipedia

R-value (insulation) - Wikipedia.

In the context of construction, the R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive flow of heat. R-value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the warmer surface and colder surface of a barrier under steady-state conditions..


R-value - Wikipedia.

R-value or rvalue may refer to: . R-value (insulation) in building engineering, the efficiency of insulation of a house R-value (soils) in geotechnical engineering, the stability of soils and aggregates for pavement construction R-factor (crystallography), a measure of the agreement between the crystallographic model and the diffraction data R 0 or R number, the basic ....


R-value (soils) - Wikipedia.

The R-Value test measures the response of a compacted sample of soil or aggregate to a vertically applied pressure under specific conditions. This test is used by Caltrans for pavement design, replacing the California bearing ratio test. Many other agencies have adopted the California pavement design method, and specify R-Value testing for subgrade soils and road ....


Human resources - Wikipedia.

Human resources is the set of people who make up the workforce of an organization, business sector, industry, or economy.A narrower concept is human capital, the knowledge and skills which the individuals command.Similar terms include manpower, labor, personnel, associates or simply: people. The human-resources department (HR department) of an organization performs ....


Real versus nominal value (economics) - Wikipedia.

The price index is applied to adjust the nominal value of a quantity, such as wages or total production, to obtain its real value. The real value is the value expressed in terms of purchasing power in the base year.. The index price divided by its base-year value / gives the growth factor of the price index.. Real values can be found by dividing the nominal value by the growth factor of ....


Aaliyah: The Princess of R&B - Wikipedia.

Aaliyah: The Princess of R&B is a 2014 American biographical television film that was directed by Bradley Walsh and is based on the life and career of R&B music star Aaliyah Dana Haughton, following her rise to fame and tragic death at age 22 when she was killed in a plane crash.The film is also based on the biography Aaliyah: More than a Woman by Christopher John Farley..


x̅ and R chart - Wikipedia.

Properties. The "chart" actually consists of a pair of charts: One to monitor the process standard deviation (as approximated by the sample moving range) and another to monitor the process mean, as is done with the ? and s and individuals control charts.The ? and R chart plots the mean value for the quality characteristic across all units in the sample, ?, plus the range of the quality ....


Lumped-element model - Wikipedia.

Signal timescales of interest are much larger than propagation delay of electromagnetic waves across the lumped element.; The first two assumptions result in Kirchhoff's circuit laws when applied to Maxwell's equations and are only applicable when the circuit is in steady state.The third assumption is the basis of the lumped-element model used in network analysis..


Intermediate value theorem - Wikipedia.

In mathematical analysis, the intermediate value theorem states that if is a continuous function whose domain contains the interval [a, b], then it takes on any given value between () and () at some point within the interval.. This has two important corollaries: . If a continuous function has values of opposite sign inside an interval, then it has a root in that interval (Bolzano's theorem)..


Glossary of BitTorrent terms - Wikipedia.

Hash checks greatly reduce the chance that invalid data is incorrectly identified as valid by the BitTorrent client, but it is still possible for invalid data to have the same hash value as the valid data and be treated as such. This is known as a hash collision. Torrent and p2p files typically use 160 bit hashes that are reasonably free from ....


Gaussian function - Wikipedia.

for arbitrary real constants a, b and non-zero c.It is named after the mathematician Carl Friedrich Gauss.The graph of a Gaussian is a characteristic symmetric "bell curve" shape.The parameter a is the height of the curve's peak, b is the position of the center of the peak, and c (the standard deviation, sometimes called the Gaussian RMS width) controls the width of the "bell"..


Callback (computer programming) - Wikipedia.

In computer programming, a callback or callback function is any reference to executable code that is passed as an argument to another piece of code; that code is expected to call back (execute) the callback function as part of its job. This execution may be immediate as in a synchronous callback, or it might happen at a later point in time as in an asynchronous callback..


Spline (mathematics) - Wikipedia.

In mathematics, a spline is a special function defined piecewise by polynomials.In interpolating problems, spline interpolation is often preferred to polynomial interpolation because it yields similar results, even when using low degree polynomials, while avoiding Runge's phenomenon for higher degrees.. In the computer science subfields of computer-aided design and computer ....


Magic SysRq key - Wikipedia.

The magic SysRq key is a key combination understood by the Linux kernel, which allows the user to perform various low-level commands regardless of the system's state.It is often used to recover from freezes, or to reboot a computer without corrupting the filesystem. Its effect is similar to the computer's hardware reset button (or power switch) but with many more options and ....


Cost - Wikipedia.

In production, research, retail, and accounting, a cost is the value of money that has been used up to produce something or deliver a service, and hence is not available for use anymore. In business, the cost may be one of acquisition, in which case the amount of money expended to acquire it is counted as cost. In this case, money is the input that is gone in order to acquire ....


Electric field - Wikipedia.

The electric field is defined at each point in space as the force per unit charge that would be experienced by a vanishingly small positive test charge if held stationary at that point.: 469-70 As the electric field is defined in terms of force, and force is a vector (i.e. having both magnitude and direction), it follows that an electric field is a vector field..


Conditional expectation - Wikipedia.

In probability theory, the conditional expectation, conditional expected value, or conditional mean of a random variable is its expected value - the value it would take "on average" over an arbitrarily large number of occurrences - given that a certain set of "conditions" is known to occur. If the random variable can take on only a finite number of values, the "conditions" are that ....


Sidereal time - Wikipedia.

Sidereal time (as a unit also sidereal day or sidereal rotation period) (sidereal / s aI ' d I?r i ?l, s ?-/ sy-DEER-ee-?l, s?-) is a timekeeping system that astronomers use to locate celestial objects.Using sidereal time, it is possible to easily point a telescope to the proper coordinates in the night sky.In short, sidereal time is a "time scale that is based on Earth's rate of ....