helical or spiral cone beam computed tomography is a type of three-dimensional computed tomography ct in which the source usually of x-rays describes a helical trajectory relative to the object while a two-dimensional array of detectors measures the transmitted radiation on part of a cone of rays emanating from the source.
a hyperbolic spiral apears as image of a helix with a special central projection see diagram . a hyperbolic spiral is some times called reciproke spiral, because it is the image of an archimedian spiral with an circle-inversion see below .
a spiral bridge, loop bridge, or pigtail bridge is a road bridge which loops over its own road, allowing the road to climb rapidly. this is useful in steep terrain, or where the approach road to a bridge would terminate too far from the bridge's end. the shape of the bridge forms a helix, not a spiral.. many multi-storey car parks feature such a design as this.
hevea brasiliensis, the pará rubber tree, sharinga tree, seringueira, or, most commonly, the rubber tree or rubber plant, is a flowering plant belonging to the spurge family euphorbiaceae.it is the most economically important member of the genus hevea because the milky latex extracted from the tree is the primary source of natural rubber
neurostimulation is the purposeful modulation of the nervous system's activity using invasive e.g. microelectrodes or non-invasive means e.g. transcranial magnetic stimulation or transcranial electric stimulation, tes, such as tdcs or transcranial alternating current stimulation, tacs .neurostimulation usually refers to the electromagnetic approaches to neuromodulation.
crushing, a form of comminution, one of the unit operations of mineral processing. in the field of extractive metallurgy, mineral processing, also known as ore dressing, is the process of separating commercially valuable minerals from their ores.
spiral computed tomography, or helical computed tomography, is a computed tomography ct technology in which the source and detector travel along a helical path relative to the object. typical implementations involve moving the patient couch through the bore of the scanner whilst the gantry rotates. spiral ct can achieve improved image .
additional spirals may be included as well, to form a multi-spiral structure. usually the spiral is cavity-backed, that is there is a cavity of air or non-conductive material or vacuum, surrounded by conductive walls; the cavity changes the antenna pattern to a unidirectional shape. the output of the antenna is a balanced line.
the spiral angle in a spiral bevel gear is the angle between the tooth trace and an element of the pitch cone, and corresponds to the helix angle in helical teeth. unless otherwise specified, the term spiral angle is understood to be the mean spiral angle.
a helix, plural helixes or helices, is a shape like a corkscrew or spiral staircase. it is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. helices are important in biology, as the dna molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. the word helix comes from the greek word ἕλιξ, 'twisted, curved'. a 'filled-in' helix – for example, a 'spiral' ramp – is called a helicoid.
these cochlear implant electrodes are either strht or spiral such as med el combi 40 and advanced bionics helix microelectrodes respectively. in visual implants, there are two types of electrode arrays called planar type or three dimensional needle or pillar type, where needle type array such as utah array is mostly used for cortical and .
a helicopter main rotor or rotor system is the combination of several rotary wings rotor blades and a control system that generates the aerodynamic lift force that supports the weight of the helicopter, and the thrust that counteracts aerodynamic drag in forward flight. each main rotor is mounted on a vertical mast over the top of the helicopter, as opposed to a helicopter tail rotor, which .
wet spiral separators. spiral separators of the wet type, also called spiral concentrators, are devices to separate solid components in a slurry, based upon a combination of the solid particle density as well as the particle's hydrodynamic properties e.g. drag . the device consists of a tower, around which is wound a sluice,.
ideal sources for wikipedia's health content are defined in the guideline wikipedia:identifying reliable sources medicine and are typically review articles.here are links to possibly useful sources of information about spiral computed tomography.. pubmed provides review articles from the past five years limit to free review articles ; the trip database provides clinical publications about .
tunnel characteristics. the tunnel is 1,650 metres 5,410 ft long and in the shape of a helix, with six rising circles, in the same style as a multi-storey parking lot. each rotation of the helix rises 73 feet 22 m , covering a diameter of 230 feet 70 m . the tunnel emerges at a summit 600 feet 180 m above the town on skansen ridge,.
oxygen therapy, also known as supplemental oxygen, is the use of oxygen as a medical treatment. this can include for low blood oxygen, carbon monoxide toxicity, cluster headaches, and to maintain enough oxygen while inhaled anesthetics are given. long-term oxygen is often useful in people with chronically low oxygen such as from severe copd or cystic fibrosis.
an otolith greek: ὠτο-, ōto-ear λῐ́θος, líthos, a stone , also called statoconium or otoconium or statolith, is a calcium carbonate structure in the saccule or utricle of the inner ear, specifically in the vestibular system of vertebrates. the saccule and utricle, in turn, together make the otolith organs.these organs are what allows an organism, including humans, to perceive .
a helical antenna is an antenna consisting of one or more conducting wires monofilar, bifilar, or quadrifilar with 1, 2, or 4 wires respectively wound in the form of a helix.in most cases, directional helical antennas are mounted over a ground plane, while omnidirectional designs may not be.the feed line is connected between the bottom of the helix and the ground plane.
haliotis cracherodii black abalone is a species of large edible sea snail, a marine gastropod mollusk in the family haliotidae, the abalones.. this species is relatively small compared with most of the other abalone species from the eastern pacific, and it has a relatively smooth dark shell.. this used to be the most abundant large marine mollusk on the west coast of north america, but now .