What is an annular in medical terms?
Annulus: A ringlike structure, or any body part that is shaped like a ring. Applied to many small ring-shaped structures. The base of a heart valve that supports the valve’s leaflets is called the annulus. A ring-shaped pancreas that encircles the duodenum is an annular pancreas.
What is annulus?
1 : ring. 2 : a part, structure, or marking resembling a ring: such as. a : a line of cells around a fern sporangium that ruptures the sporangium by contracting. b : a growth ring (as on the scale of a fish) that is used in estimating age.
What is annular domain?
From Encyclopedia of Mathematics. A doubly-connected planar domain between two closed Jordan curves without common points, one of each encloses the other. For an annular domain with respect to a quadratic differential, see Global structure of trajectories of a quadratic differential.
What is annulus region?
In mathematics, an annulus (plural annuli or annuluses) is the region between two concentric circles. Informally, it is shaped like a ring or a hardware washer. The word annulus is borrowed from the Latin word anulus or annulus meaning ‘little ring’. The adjectival form is annular (as in annular eclipse).
What is 2 pi R DR?
Indeed, a disk may be divided into a number of thin concentric annuli; an annulus of radius r and width dr has area approximately 2 pi r dr; and adding these areas by integrating gives the area of the disk. Thus pi r2 is the integral of 2 pi r, or, equivalently, 2 pi r is the derivative of pi r2.
What is annular in geography?
annular – shaped like a ring. annulate, annulated, circinate, doughnut-shaped, ringed, ring-shaped. rounded – curving and somewhat round in shape rather than jagged; low rounded hills; rounded shoulders Based on WordNet 3.0, Farlex clipart collection.
What is annulus in oil and gas?
1. n. [Drilling]The space between two concentric objects, such as between the wellbore and casing or between casing and tubing, where fluid can flow. Pipe may consist of drill collars, drillpipe, casing, or tubing. Alternate Form: annuli.
What is annulus in spine?
The annulus fibrosus is the tough circular exterior of the intervertebral disc that surrounds the soft inner core, the nucleus pulposus. This outer portion is composed of a ring of ligament fibers that encases the inner core of the disc and securely connects the spinal vertebrae above and below the disc.
What is the function of the annulus?
The annulus is a sturdy tire-like structure that encases a gel-like center, the nucleus pulposus. The annulus enhances the spine’s rotational stability and helps to resist compressive stress. The annulus is a layered structure consisting of water and sturdy elastic collagen fibers.
What is annulus in mining?
An annulus is the space between two concentric objects (= objects of the same shape in which a larger one surrounds a smaller one), for example, between the wellbore and casing. … Perforation provides holes in the casing so that materials may be introduced into the annulus between the casing and the wall of the borehole.
Is annulus a connected region?
Definition A domain D is called simply connected is every closed contour Γ in D can be continuously deformed to a point in D. The whole complex plane C and any open disk Br (z0) are simply connected. We’ll see shortly that the annulus A = < 2 is not simply connected.
Is a torus an annulus?
As nouns the difference between annulus and torus is that annulus is a ring- or donut-shaped area or structure while torus is (topology) a topological space which is a product of two circles.
Is an annulus 2d?
An annulus is a two-dimensional flat figure shaped in a circular form which is constructed by two concentric circles. The region or the area formed in between these two concentric circles is called the annulus.
What is annulus in ear?
The annulus fibrosus tympanicus is the thickened peripheral rim of the pars tensa of the tympanic membrane. It is an area into which the connective tissue matrix of the membrane extends to attach to the tympanic bone (ring).
What is annulus Class 11?
An annulus is a shape made out of two circles. It is a plane figure formed by two concentric circles. The region covered between two concentric circles is called annulus. It has a ring shape and has many applications in Mathematics.
What is ARC in Circle?
An arc of a circle is any part of the circumference. The angle subtended by an arc at any point is the angle formed between the two line segments joining that point to the end-points of the arc. For example, in the circle shown below, OP is the arc of the circle with center Q.
What is the boundary of an annulus?
The inner radius of an annulus is the radius of the smaller of the 2 concentric circles that form its boundary.
What formula is 2pi r?
The perimeter or circumference of the circle can be found using the equation C=2π(r), where r= the radius of the circle.
Why is dA equal to 2pir DR?
The derivative of the area of a circle with respect to its radius is equal to the circle’s circumference (dA/dr=2πr). … If you increased the radius of the circle by putting your finger inside it and pushing the edge outward, then you would have to push it around the whole circumference of the circle. Heh.
What is pi r math?
Pi is an inbuilt R constant whose value is 3.141593. The pi constant is a ratio of the circumference of a circle to its diameter.
What is an annular solar eclipse?
An annular eclipse occurs when the Sun and Moon are exactly in line with the Earth, but the apparent size of the Moon is smaller than that of the Sun. Hence the Sun appears as a very bright ring, or annulus, surrounding the dark disk of the Moon.
What is the meaning of Ernst?
German and Dutch: from the personal name Ernst, which is most probably a byname from Middle High German and Middle Dutch ern(e)st ‘combat’, ‘serious business’. Jewish (Ashkenazic): nickname or ornamental from German ernst ‘earnest’, ‘serious’. …
What means milksop?
: a weak or cowardly man.
What is annular gas?
Annular gas flow can be defined as the formation gas flow in the concentric space between a casing and a wellbore wall, which is also known as annulus. The formation gas flows through the annulus during the phase when there is inadequate hydrostatic pressure.
What is annular pressure?
Annular Pressure is the pressure exerted by the hydrocarbons in the annulus of a well or between two strings of casing inside a producing well.
What is annular flow?
1. n. [Production Logging] A multiphase flow regime in which the lighter fluid flows in the center of the pipe, and the heavier fluid is contained in a thin film on the pipe wall. The lighter fluid may be a mist or an emulsion.
What is annular tear at L4 L5?
The annular tear is a tearing of the disc external surface that may occur with the aging process or with injury. The L4-5 and L5-S1 discs are the most commonly affected. The annulus may thin or bulge or weaken to the point that disc material may extrude into the spinal canal.
What does annular tear on MRI mean?
An annular tear occurs when the outer layer of a spinal disc, also known as the annulus fibrosus, suffers damage and tears. This can cause the gelatinous contents inside the disc, aka the nucleus pulposus, to rupture or herniate.
What is the function of the intervertebral disc?
The inter- vertebral disc serves primarily to allow movement between adjacent vertebral bodies, to absorb shock, and to transmit loads through the vertebral column. The complex morphology and structure of the intervertebral disc of the lumbar spine reflects these functions.
Graduated from ENSAT (national agronomic school of Toulouse) in plant sciences in 2018, I pursued a CIFRE doctorate under contract with Sun’Agri and INRAE in Avignon between 2019 and 2022. My thesis aimed to study dynamic agrivoltaic systems, in my case in arboriculture. I love to write and share science related Stuff Here on my Website. I am currently continuing at Sun’Agri as an R&D engineer.