# Unit

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## unit

1. a mechanical part or integrated assembly of parts that performs a subsidiary function
2. a complete system, apparatus, or establishment that performs a specific function
3. the amount of a drug, vaccine, etc., needed to produce a particular effect
4. a standard measure used in calculating alcohol intake and its effect
5. Maths
a. the first position in a place-value counting system, representing a single-digit number
b. having a value defined as one for the system
6. Maths logic a set having a single member
7. NZ a self-propelled railcar
www.psigate.ac.uk/newsite/reference/units.html
www.ex.ac.uk/cimt/dictunit/dictunit.htm
www.unc.edu/~rowlett/units/index.html

## Unit

in technology, a consolidated unified (normalized) assembly of a machine or complex of machines that possesses complete interchangeability and independently accomplishes isolated functions. A unit is characterized by electric motors, reducers, pumps and so forth. Sometimes the term “unit” refers to a combination of two or more machines.

## Unit

In the theory of algebraic numbers and in the theory of algebraic functions, a divisor of unity is called a unit, that is, a is a unit if there exists an element b such that ab = 1.

## unit

[′yü·nət]
(engineering)
An assembly or device capable of independent operation, such as a radio receiver, cathode-ray oscilloscope, or computer subassembly that performs some inclusive operation or function.
(mathematics)
An element of a ring with identity that has both a left inverse and a right inverse.
(ordnance)
Any military element whose structure is prescribed by competent authority, such as a table of organization and equipment; specifically, part of an organization.
A standard of basic quantity into which an item of supply is divided, issued, or used.
(physics)
A quantity adopted as a standard of measurement.
References in periodicals archive ?
Predictive value of attenuation coefficients measured as Hounsfield units on noncontrast computed tomography during flexible ureteroscopy with holmium laser lithotripsy: a single-center experience.
The Hounsfield Unit (HU) is linked directly to the attenuation value and the applied energy, at any effective energy used in the CT scanner [15].
Hounsfield units of some related substances [11] are shown in Table 1.
In CT scans, the Hounsfield Unit (HU) is used as a measure of the relative density of a certain area of tissue.
For the degrees of parenchymal attenuation and enhancement, Hounsfield unit (HU) values were measured in both thyroid lobes, by using regions of interest (ROIs) on nonenhanced and contrast-enhanced CT images, respectively, and then averaged (Figure 1).
Hounsfield unit density was calculated to determine urinary stone composition, as described previously [8].
Each divided lung section was categorised according to their Hounsfield unit (HU) into hyperinflated (-1000~-900 HU), well-aerated (-900~-500 HU), poorly-aerated (-500~-100 HU) and non-aerated (-100~100 HU) volumes and analysed with Rapidia[R] 2.7 (3DMED, Seoul, Korea), a volume- and Hounsfield unit-calculating software.
The unlabelled dark circular spot to the right of root D is a dead root as indicated by its Hounsfield unit value (CT scanner image number).
A board with wet pockets is shown in the CT-scanning images in clear color and with low values of the Hounsfield Unit (HU) or "CT number".
To optimize the CT angiography protocol, we conducted a systematic study divided into two parts with the aim to determine the kV-specific minimal IDR and contrast media volume necessary to obtain diagnostic aortic intravascular attenuation (350 Hounsfield Units [HU] threshold).
Patient then underwent CT scan examination of the thorax that revealed a huge fat density (-65 to -105 Hounsfield units) lobulated lesion with scattered areas of soft tissue density and septations in right hemithorax causing passive collapse of the underlying right middle and lower lobe with contralateral mediastinal shift.
Any renal mass that enhances with intravenous administration of contrast material on CT scanning by more than 15 hounsfield units (HU) should be considered a renal cell carcinoma (RCC) until proved otherwise1,2.

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