# 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 ?
Stone diameters and Hounsfield units (HU) were measured with large magnification in bone window on NCCT images (Figure 1).
From the DICOM data the bone anatomy of the patient is segregated using Hounsfield Units value, In the MIMICS the HU value for the bone starts from 226 to 3071.
While no study is presently investigating stone opacity as a predictor in pediatric population, there are fewer studies in the literature about Hounsfield units (HU) predicting the success of SWL in children (15); however, HU can be evaluated in conjunction with NCCT.
Conversely, carcinomas, having less intracytoplasmic fat, will have higher attenuation and greater Hounsfield units than adenomas.
The most significant limitations of CBCT devices are the lack of accurate presentation of the soft tissue internal structure, limited correlation between Hounsfield units for standardized quantification of bone density, and different types of artifacts arising mainly from metal restorations that can interfere with the diagnostic process by masking the underlying structure [6].
Renal cell carcinoma and transitional cell carcinoma have typically higher density than urine and their densities are measured to be 5-30 Hounsfield units (HU) in CT without contrast administration.
Hounsfield units are used to measure X-ray attenuation of contrast agents.
The bone height was measured using the CT Scans along with the bone density in terms of Hounsfield units and an implant was chosen accordingly.
To evaluate parenchymal remodeling, we evaluated the following measures: a) percent emphysema defined by the percentage of low attenuation area of lung < -950 Hounsfield units (HU) at full inspiration ([LAA.
3 cm with a native density of 40 Hounsfield units (HU) [8].
Images were obtained helically in a caudocranial direction through the chest after the peripheral intravenous administration of 100 mL of nonionic low-osmolality iodinated contrast medium (Optiray 350; Tyco Healthcare, Montreal, QC, Canada) injected at a flow rate of 4 mL/s with bolus tracking triggered over the main pulmonary artery at 120 Hounsfield units.
Computed tomography is very sensitive in identifying characteristic erosions and demonstrating the density of tophi as 170 Hounsfield units.

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