magnetic field


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field

 [fēld]
1. an area or open space, as an operative field or visual field.
2. a range of specialization in knowledge, study, or occupation.
3. in embryology, the developing region within a range of modifying factors.
auditory field the space or range within which stimuli will be perceived as sound.
disturbed energy field a nursing diagnosis defined as a disruption of the flow of energy surrounding a person's being that results in disharmony of the body, mind, and/or spirit.
energy field the flow of energy surrounding a person.
extended field in radiation therapy, such as for malignant lymphoma, an area of irradiation beyond the involved field. See also under irradiation.
high-power field the area of a slide visible under the high magnification system of a microscope.
individuation field a region in which an organizer influences adjacent tissue to become a part of a total embryo.
inverted Y field in radiation therapy, such as for malignant lymphoma, a circumscribed area of irradiation below the diaphragm, covering the spleen, extending down the midline, and branching inferiorly to form tails across the inguinal areas.
involved field in radiation therapy, such as for malignant lymphoma, the irradiated area when irradiation has been limited to sites of detectable macroscopic disease. See also under irradiation.
low-power field the area of a slide visible under the low magnification system of a microscope.
magnetic field that portion of space about a magnet in which its action is perceptible.
mantle field in radiation therapy, such as for malignant lymphoma, a circumscribed area of irradiation around the shoulders and chest, including the neck, clavicular regions, axillae, and mediastinum. See also under irradiation.
morphogenetic field an embryonic region out of which definite structures normally develop.
operating field (operative field) an isolated area where surgery is performed; it must be kept sterile by aseptic techniques (see surgical asepsis). Called also surgical field.
sterile field an operative field that is properly sterile according to surgical asepsis. It includes having all furniture and equipment covered with sterile drapes and all personnel being properly attired.
surgical field operative field.
visual field (F) (vf) the area within which stimuli will produce the sensation of sight with the eye in a straight-ahead position.

mag·net·ic field

the sphere of influence of a magnet.

magnetic field

An MRI term for the magnetic lines of force (flux) which extend from a north polarity and enter a south polarity of a magnet to form a closed loop around the outside of a magnetic material.

Magnetic field

The three-dimensional area surrounding a magnet, in which its force is active. During MRI, the patient's body is permeated by the force field of a superconducting magnet.
References in periodicals archive ?
So, with more exploration, we could find older images of galaxies and their magnetic field to help plot the graph leading to a definitive answer about how this energy morphed over time.
For example, the values of the magnetic field of some compound magnets were obtained with a Lakeshore Gaussmeter model 475 DSP in the plots of Figure 3, at room temperature of 27[degrees] C, with a Hall sensor.
The sketch of the transmission line layout, control windings, as well as the region of space in which the magnetic field must be shielded are shown in Fig.
NASA's Galileo mission measured Ganymede's magnetic field in 2002, providing the first evidence supporting those suspicions.
As shown in Figures 2(c) and (d), if we apply a uniform background static magnetic field whose magnetic flux density is 1 T (as a numerical example), the static magnetic field inside our device (large free space) can be larger than 50 T, which cannot be achieved by any traditional method [29, 30].
During development, it was noticed, that after exposing the sensor to a strong magnetic field (using permanent magnet from HDD or speaker) from a distance of 5-15 cm, the readings of magnetic field components are changed substantially (Fig.
We have focused this research on uniformity of magnetic field and the differences in determination of coils conversion constant.
It had been thought that when the sun's magnetic field is aligned with that of the Earth, the door is shut and that few if any solar particles enter Earth's magnetic shield.
The behavior of all particles involved in neutron decay in the experiment is dominated by the influence of the magnetic field in the case of neutrons or combined magnetic and electrostatic fields for the charged decay particles (neutrinos may be neglected).
How would birds and turtles fare, since many of them use Earth's magnetic field to navigate?
For example, no effects on melatonin or its major urinary metabolite, 6-hydroxymelatonin-sulfate (6-OHMS), were found in human exposure studies that varied such key magnetic field parameters as frequency (50 Hz or 60 Hz), intensity [1-127.3 microTesla ([micro] T)], duration (1-4 consecutive nights), polarity (linear or circular polarization), and exposure pattern (continuous or intermittent) (17-22).

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