A contact microphone is a form of microphone designed not for picking up airborne sound waves, but rather to act as a transducer which picks up vibrations through solid materials and converts them into audible sound. Often used as an acoustic leakage probe, and known by the more technical term as a ‘piezoelectric vibration transducer’.
DEG or deg is an acronym or initialism that can mean:
- Diethylene glycol, an organic compound
- Degree
- Degree (angle), a measurement of plane angle
- Degree (temperature), used in several scales of temperature
- Degree symbol, a typographical symbol °
- Degree of curvature, a measure of curvature used in civil engineering
- Degree of a polynomial, a mathematical concept that is often abbreviated “deg”
- DEG Metro Stars, an ice hockey team from Düsseldorf, Germany
- The NYSE stock symbol for Delhaize Group, a Belgium based food retailer
- Dir en grey, a Japanese rock band
- Degradation
- Dég, a village in Hungary
- Dwarf elliptical galaxy, often abbreviated as “dEg” or “dEG”
- MySpace For those who aren't familiar with the BCR Fan Database, read on! — the full database for an abbreviated online version that just included names,
- Acta Pharmacologica Sinica Down-regulation of p210bcr/abl by curcumin involves disrupting molecular chaperone . and then incubated with Fluorescein (mistakenly abbreviated by its
- Identification of related gene/protein names based on an HMM of File Format: PDF/Adobe Acrobat - View as HTMLacters, be misspelled, truncated, or abbreviated. As another. example, abl1-bcr gene, abl1/bcr gene, bcr-abl1 gene, and. 5’abl1 all refer to the abl gene.
- CHEMISTRY. Bcr. . . . . Ber. Bcut. hot. Ges. . Bcr. De1l.t. pharm. Ges. Biochem. J. . . Biochem. Z. . . IZrdnrLstotf-Chcm. . Brit. Assoc. Aep.
- Magnetic resonance imaging apparatus and RF coil employed therein A saddle coil, a slotted tube resonator (hereinafter abbreviated to STR), and a bird cage resonator (hereinafter abbreviated to BCR) are conventionally used
The Way I Feel is the name of several music albums:
- The Way I Feel (Leonard Nimoy album) by Leonard Nimoy.
- The Way I Feel (John Patton album) (1964) by John Patton
- The Way I Feel (Gordon Lightfoot album) (1967) by Gordon Lightfoot
- The Way I Feel (Phil Upchurch album) (1970) by Phil Upchurch
- The Way I Feel (Nikki Giovanni album) (1975) by Nikki Giovanni
- The Way I Feel (Sonny Rollins album) (1976) by Sonny Rollins
- The Way I Feel (Irma Thomas album) (1988) by Irma Thomas
- The Way I Feel (Boyd Rice album) (2001) by Boyd Rice
- The Way I Feel (Remy Shand album) (2002) by Remy Shand
Corneal reflex, also known as the blink reflex, is an automated involuntary blinking of the eyelids elicited by stimulation (such as touching or a foreign body) of the eyeball’s cornea. Stimulation should elicit both a direct and consensual response. The evolutionary purpose of this reflex is to protect the eyes from foreign bodies.
The reflex is mediated by:
- the nasociliary branch of the ophthalmic branch (V1) of the 5th Cranial nerve (Trigeminal nerve) sensing the stimulus on the cornea,
- and the 7th Cranial nerve (Facial nerve) initiating the motor response.
Use of contact lenses may diminish or abolish this reflex.
The examination of the corneal reflex is a part of some neurological tests in particular the coma exam.
See also
External links
An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration.
The most common type of achromat is the achromatic doublet, which is composed of two individual lenses made from glasses with different amounts of dispersion. Usually one element is a concave lens made out of flint glass, which has relatively high dispersion, while the other, convex, element is made of crown glass, which has lower dispersion. The lens elements are mounted next to each other and shaped so that the chromatic aberration of one is counterbalanced by the chromatic aberration of the other, while the positive power of the crown lens element is not quite equalled by the negative power of the flint lens element. Together they form a weak positive lens that will bring two different wavelengths of light to a common focus. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus in the same plane.
Credit for the first invention, around 1733, of the achromatic refracting lens is given to an English barrister named Chester Moore Hall.
The exact date of the first achromatic doublet’s creation is not known, nor is the name of the person who first accomplished the task. Theoretical considerations of the feasibility of the system were debated in the 18th century following Newton’s statement that such a correction was impossible (see History of the telescope). Some of the concepts were demonstrated with lenses made of glass and water, but the first useful lenses were not known to have been made until the early 18th century by George Bass under the direction of Hall. The first patent for an achromatic doublet was awarded to John Dollond around 1758 following his independent theoretical and experimental work.
The triple achromat, which reduced secondary colour defects, was invented in 1763 by Peter Dollond.
See also
- Achromatic telescope
- Apochromat
In mathematics, in the area of symplectic topology, relative contact homology is an invariant of spaces together with a chosen subspace. Namely, it is associated to a contact manifold and one of its Legendrian submanifolds. It is a part of a more general invariant known as symplectic field theory, and is defined using pseudoholomorphic curves.
Legendrian knots
The simplest case yields invariants of Legendrian knots inside contact three-manifolds. The relative contact homology has been shown to be a strictly more powerful invariant than the “classical invariants”, namely Thurston-Bennequin number and rotation number (within a class of smooth knots).
Yuri Chekanov developed a purely combinatorial version of relative contact homology for Legendrian knots, i.e. a combinatorially defined invariant that reproduces the results of relative contact homology.
Tamas Kalman developed a combinatorial invariant for loops of Legendrian knots, with which he detected differences between the fundamental groups of the space of smooth knots and of the space of Legendrian knots.
Higher-dimensional legendrian submanifolds
In the work of Lenhard Ng, relative SFT is used to obtain invariants of smooth knots: a knot or link inside a topological three-manifold gives rise to a Legendrian torus inside a contact five-manifold, consisisting of the unit conormal bundle to the knot inside the unit cotangent bundle of the ambient three-manifold. The relative SFT of this pair is a differential graded algebra; Ng derives a powerful knot invariant from a combinatorial version of the zero-th degree part of the homology. It has the form of a finitely presented tensor algebra over a certain ring of multivariable Laurent polynomials with integer coefficients. This invariant assigns distinct invariants to (at least) knots of at most ten crossings, and dominates the Alexander polynomial and the A-polynomial (and thus distinguishes the unknot).
References
- Lenhard Ng, Conormal bundles, contact homology, and knot invariants.
- Tobias Ekholm, John Etnyre, Michael G. Sullivan, Legendrian Submanifolds in $R^{2n+1}$ and Contact Homology.
- Yuri Chekanov, “Differential Algebra of Legendrian Links”. Inventiones Mathematicae 150 (2002), pp. 441-483.
- Contact homology and one parameter families of Legendrian knots by Tamas Kalman
See also
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Intonation, in music, is a player’s realization of pitch accuracy.
Strings
In string instruments, intonation is more of a worry than in other instruments. Because many string instruments are unfretted, if a finger is too high or too low by even a fraction of a centimetre, the note will be out of tune. The process of gaining good intonation typically takes many years of playing to acquire and is arguably the hardest part of learning a stringed instrument.
The same principles of intonation that apply to strings apply to the trombone, because the trombone uses a slide instead of valves. However, the margin of error is much wider on the trombone as it has only seven basic slide positions on a slide length of over 80 centimetres.
Fret intonation
Instruments with straight frets such as guitars require special compensation on the saddle and nut.
Every time a string is fretted, it is also stretched. As the string is stretched, every note will rise in pitch. Therefore, all fretted tones would sound sharp. However, with the right position of the saddle and precise placements of the frets, all fretted notes will sound sharp by the same amount.
With the right nut compensation, the pitch of the unfretted (i.e., open) strings will rise the same amount that the fretted notes do (because of the proper saddle position). Thus, these adjustments combined with lowering the tension of the string from that required by an unfretted instrument will allow all tones to be exact.
External links
- Konrad Schwingenstein: Intonation of stringed instruments with straight frets , http://www.pepithesecond.com
See also
Asperity is defined as unevenness of surface, roughness, ruggedness (OED). Flat surfaces, even those polished to a mirror finish, are not truly flat on an atomic scale. They are rough, with sharp, rough or rugged outgrowth, termed asperities.
When two macroscopically flat surfaces come into contact, initially they only touch at a few of these asperity points. These cover only a very small portion of the surface area. Friction and wear originate at these points and thus understanding their behavior is important when studying materials in contact. When the surfaces are subjected to a compressive load, the asperities plastically deform, increasing the contact area between the two surfaces until the contact area is sufficient to support the load.
The Archard equation is a simplified model of asperity deformation when materials in contact are subject to a force.
Studio B or Studio B Productions Inc. is an award winning animation studio based in Vancouver, British Columbia.
Studio B Productions original shows
- Being Ian
- Class of the Titans
- D’Myna Leagues
- Ricky Sprocket, Showbiz Boy
- Something Else
- The Amazing Adrenalini Brothers
- What about Mimi?
- Yvon of the Yukon
- Yakkity Yak
Studio B Productions service work
- Corduroy
- Edgar & Ellen
- Johnny Test
- Pucca
- Reader Rabbit
- Santa Mouse
- Stroker & Hoop
- The Legend of Frosty the Snowman
- Woody Woodpecker
External links
- Studio B Productions website
- The Amazing Adrenalini Brothers! website
- Being Ian website
- D’Myna Leagues website
- What About Mimi? website
- Yvon of the Yukon website
The 4Pi-STED-microscope is the result of combining the two unrelated concepts of STED- and 4Pi-microscopy. Here, the fluorescent sample is placed in the common focus of two opposing lenses, but excitation and detection are performed through a single lens (4Pi mode A). The green excitation pulse is immediately followed by a red STED-pulse, which enters the focal region through both lenses inducing stimulated emission of the excited fluorescent molecules to the ground state. To permit fluorescence emission from the center but suppress it from neighbouring regions it is useful to phaseshift the STED beam to have a minimum at the center.
External links
Technical details
A teleconverter is a secondary lens which is mounted between the camera and a photographic lens. Its job is to enlarge the central part of an image obtained by the objective lens. For example a 2× teleconverter enlarges the central 12×18 mm part of an image to the size of 24×36 mm. Teleconverters are typically made in 1.4×, 2× and 3× models.
The use of a 2× teleconverter (or doubler) gives the effect of using lens with twice the focal length. It also decreases the intensity of the light reaching the film by the factor of 4 (an equivalent of doubling the focal ratio) as well as the resolution (by the factor of 2).
Teleconverter works similarly to a telephoto group of a proper telephoto lens. It consists of a group of lenses which together act as a single diverging lens. The location of a teleconverter is such that the image produced by the objective is located behind the teleconverter in a distance smaller than its focal length. This image is a virtual object of the teleconverter which is then focused further away and thus enlarged. For example when a single negative lens is placed so that the image formed by the objective is located in the midpoint between the lens and its focal point the lens produces the image in its focal point enlarging it two times thus acting as a 2× teleconverter.
Dedicated teleconverters only work with a limited number of lenses, usually telephoto lenses made by the same manufacturer.
The use of objective with teleconverter is less expensive than telephoto lens but also introduces some aberrations.
A Leica R series doubler, with the female part of in bayonet mount…
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Contact means to touch physically or to communicate with.
Contact may also refer to:
General uses
- Contact lens, a corrective, cosmetic, or therapeutic lens
- Contact process, a method for producing sulfuric acid on an industrial scale
- Contact (law), in Family Law, deals with the right of parents or other significant persons to meet with and relate to a child
- Active component of electric switch or electrical connector
- vCard or hCard, in address books, a contact is the name, address, phone number, and other pertinent information
- Contact paper, in photography, used to print negatives without enlargement
- Contact (mathematics), a mathematical concept, the idea of curves (for example) touching
- Optical contacting, a process in which two highly polished surfaces are permanently or temporarily joined without use of any adhesive
- Contact Energy, an energy company in New Zealand
- The initial fighting with an enemy unit, in a military context
- Contact Conference, an annual interdisciplinary scientific conference
- A social contact, a person renowned for performing special and often illegal favors for individuals in return for goods or services.
- First contact between different cultures.
- Radar contact, the display of a single radar return from an object as a result of one radar sweep. (Compare with track).
- CONTACT USA, a Crisis Hotline.
- Amateur radio contact, an exchange of information between two amateur radio operators
In music
- Contact (musical), a dance musical
Albums
- Contact (Fantastic Plastic Machine album), an album by Fantastic Plastic Machine
- Contact!, an album by Eiffel 65
- Contact (Silver Apples album), an album by Silver Apples
- Contact, an album by The Benjamin Gate
- Contact (Thirteen Senses album), an album by Thirteen Senses.
- Contact (Indo G album), an album by Indo G
Songs
- “Contact”, a song by Thirteen senses from the above album.
- “Contact”, a song from the broadway version of the rock opera, “Rent”.
- “Contact”, a song by The Police from their 1979 album Reggatta de Blanc
- “Contact (song)”, by the French rock band Kyo.
- “Contact” (Phish song), an early Phish song
Television and film
- Contact (film), based on the novel by Carl Sagan, starring Jodie Foster and Matthew McConaughey
- The Contact, a Korean film
- 3-2-1 Contact, an American science educational TV show
- Contact, l’encyclopédie de la création, a television series.
- Contact (Code Lyoko episode), an episode of Code Lyoko
Other media
- Contact (novel), a science fiction novel by Carl Sagan
- Contact (video game), a Nintendo DS game
- Contact (Dance), a dance production by Paul Mercurio
- Contact (The Culture), in novels by Iain M. Banks, the Exploration (and sometimes military) corp of the Culture
- Contact (game), a word-guessing game.
- Contact is English for Contacto, a publication of the British Interlingua Society.
Kontakt
Eugène Kalt (1861-1941) was a French ophthalmologist who developed the first known application of a contact lens for the correction of keratoconus. In 1888, he worked on a crude flat-fitting glass scleral lenses designed to “compress the steep conical apex thereby correcting the condition”. His first lenses were crafted from the bottoms of glass test tubes.
Kalt was born in Landser in the Alsace region of France.
See also
References
- Pearson RM. “Kalt, keratoconus, and the contact lens.” Optom Vis Sci. 1989 Sep;66(9):643-6. PMID 2677884.
External links
In geometry, a deltoid is a hypocycloid of three cusps.
A deltoid can be represented by the following parametric equations
- <math>x=2a\cos(t)+a\cos(2t) \,</math>
- <math>y=2a\sin(t)-a\sin(2t) \,</math>
The deltoid satisfies the cartesian equation
- <math>(x^2+y^2)^2+18(x^2+y^2) = 8x^3-24y^2x+27</math>
and is therefore a plane algebraic curve of degree four.
It has three singularities, its three cusps, and is a curve of genus zero.
A line segment can slide with each end on the deltoid and remain tangent to the deltoid. The point of tangency travels around the deltoid twice while each end travels around it once.
The dual curve of the deltoid is
- <math>x^3-x^2-(3x+1)y^2=0,</math>
which has a double point at the origin which can be made visible for plotting by an imaginary rotation y ↦ iy, giving the curve
- <math>x^3-x^2+(3x+1)y^2=0</math>
with a double point at the origin of the real plane.
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9-a-side Footy is a sport based on Australian rules football played informally by Aussie Rules clubs but not yet an official sport in its own right.
9-a-side games are sometimes played on half size fields that are typically rectangular with 9 players on the field at any one time, typically consisting of 3 forwards, 3 backs and 3 centre players. Often two games are played at the same time on a single Australian Rules or cricket pitch. Other times, 9-a-side makes use of the full space of the field when a full complement of players is not available. This variety is a more open, running variety of Australian rules.
A minimum of 18 players are required in total, but many teams field unlimited interchange benches.
Rules are the same as Australian rules football. Limited and non-contact versions of 9-a-side Footy are also played by both men and women’s leagues.
Existing formats
- Rec Footy, sanctioned by the Australian Football League is the non-contact game.
- Touch Aussie Rules, sanctioned by Aussie Rules UK is the non-contact game played in the UK.
- Metro Footy is a 9-a-side game played on gridiron fields in the United States.
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The EF 16-35mm lens is a professional wide-angle lens made by Canon Inc. It replaces the EF 17-35mm 2.8L USM lens.
The lens has an EF mount to work with the EOS line of cameras. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from to 5.6.
References
<references />
External links
- Canon EF 16-35mm f/2.8L USM
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Asperity is defined as unevenness of surface, roughness, ruggedness (OED). Flat surfaces, even those polished to a mirror finish, are not truly flat on an atomic scale. They are rough, with sharp, rough or rugged outgrowth, termed asperities.
When two macroscopically flat surfaces come into contact, initially they only touch at a few of these asperity points. These cover only a very small portion of the surface area. Friction and wear originate at these points and thus understanding their behavior is important when studying materials in contact. When the surfaces are subjected to a compressive load, the asperities plastically deform, increasing the contact area between the two surfaces until the contact area is sufficient to support the load.
The Archard equation is a simplified model of asperity deformation when materials in contact are subject to a force.
A scleral lens is a large type of contact lens that rests on the sclera and creates a tear-filled vault over the cornea. Scleral lenses are designed to treat a variety of eye conditions which do not respond to other forms of treatment.
Design
Modern scleral lenses are made of a highly oxygen permeable polymer. They are also unique in their design in that they fit onto and are supported by the sclera, the white portion of the eye. The cause of this unique positioning is usually relevant to a specific patient, whose cornea may be too sensitive to support the lens directly. In comparison to regular contact lenses, scleral lenses bulge outward considerably more. The space between the cornea and the lens is filled with artificial tears. The liquid, which is contained in a thin elastic reservoir, conforms to the irregularities of the deformed cornea, allowing vision to be restored comfortably.
Indications for use
Scleral lenses may be used to correct any one of a growing number of disorders or injuries to the eye, such as keratoconus, corneal ectasia, Stevens-Johnson syndrome, Sjögren’s syndrome, aniridia and pellucid degeneration. Injuries to the eye such as surgical complications, distorted corneal implants, as well as chemical and burn injuries also may be treated by the use of scleral lenses.
Use in special effects
Special effect scleral lenses have also been used to produce eerie eye effects in films, such as the whited-out eyes of the monsters in Evil Dead, or blacked-out eyes in Underworld and Underworld: Evolution. These lenses tend to be uncomfortable and sometimes impede the actors’ vision, but the visual effects produced can be striking. The lenses cost around $300, are custom-made to fit the wearer’s eyes and can also be custom-painted, although most companies only sell lenses with a pre-designed look. There are many different designs available, from standard black lenses to flame-effect eyes, as well as a lens that makes the whole eye white. However, the wearer is unable to see anything while the latter variety of lens is worn. If looked after, the lenses can be kept for around one year. It is recommended that they be worn for a maximum of 5-6 hours at a time, and only occasionally.
External links
- Scleral lenses
- Special effect Scleral Lenses
- Sclerals.com
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Independent soda is soft drink generally made by smaller privately run businesses or smaller corporations who use alternative marketing strategies to promote their product.
The label ‘independent soda’ or simply ‘indie soda’ was arguably started in the early 1970s in response to Coca-Cola and Pepsi Cola’s mass media campaigns for the edge in the beverage market. Several groups decided to protest by making and in some cases publicly distributing their home made brew. Over time, many people were bought off or scared away by the two soda conglomerates.
Jones Soda is one of the more commonly known ‘independent soda’ companies. Three less commonly known independent sodas are Maine Root Soda, Blue Sky Soda and Blue Brainwash.
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Bénifontaine (which means “clear spring” in English) is one commune of northern France. Population (1999): 278.
It owes its name with the quality of sound water used in the manufacture of beer of Ch’ Ti.
Administration
Bénifontaine is located in the canton of Wingles, arrondissement of Lens, Pas-de-Calais département. It belongs to the communauté d’agglomération of Lens-Liévin (Communaupole) which gathers 36 communes, with a total population of 250,000 inhabitants.
Transportation
Bénifontaine is linked by départemental roads number D39 and D165. It is linked by route N47.
The airport of Lens-Bénifontaine (code LFQL) is located in Bénifontaine.
External links
- Communaupole of Lens-Liévin website (French)
- Aeroclub Lens website (mainly in French)
