disambiguation pp move indef Classical mechanics Vibration is a mechanical phenomenon whereby ... of a pendulum or random such as the movement of a tire on a gravel road. Vibration ... instrument or harmonica , or the cone of a loudspeaker is desirable vibration, necessary for the correct functioning of the various devices. More often, vibration is undesirable, wasting energy and creating .... Careful designs usually minimize unwanted vibrations. The study of sound and vibration are closely ... waves can also induce the vibration of structures e.g. ear drum . Hence, when trying to reduce noise it is often a problem in trying to reduce vibration. File Drum vibration mode21.gif right frame One of the possible modes of Vibrations of a circular drum vibration of a circular drum see commons Category Drum vibration animations other modes . File Beam mode 2.gif right thumb 250px One of the possible modes of vibration of a cantilever ed I beam . Types of vibration Free vibration occurs ... of this type of vibration are pulling a child back on a swing and then letting go or hitting ... natural frequency and damp down to zero. Forced vibration is when an alternating force or motion is applied to a mechanical system. Examples of this type of vibration include a shaking washing machine due to an imbalance, transportation vibration caused by truck engine, springs, road, etc. , or the vibration of a building during an earthquake . In forced vibration the frequency of the vibration ... mechanical system.... Vibration testing Vibration testing is accomplished by introducing a forcing ... vibration tests also is the most neglected , EE Evaluation Engineering, 2006 ref Other response points experience maximum vibration level resonance or minimum vibration level anti resonance . Two typical types of vibration tests performed are random and sine test. Sine one frequency at a time tests ... inputs to a moving automobile. Most vibration testing is conducted in a single DUT axis at a time ... more details
Unreferenced date November 2008 Torsional vibration is angularvibration of an object commonly a shaft along its axis of rotation. Torsional vibration is often a concern in power transmission systems using rotating shafts or couplings where it can cause failures if not controlled. In ideal power transmission systems using rotating parts the torque s applied or reacted are smooth leading to constant speeds. In reality this is not the case. The torques generated may not be smooth e.g., internal combustion engines or the component being driven may not react to the torque smoothly e.g., reciprocating compressor s . Also, the components transmitting the torque can generate non smooth or alternating torques e.g., worn gears, misaligned shafts . Because the components in power transmission systems are not infinitely stiff these alternating torques cause vibration about the axis of rotation. Crankshaft torsional vibration Torsional vibration is a concern in the crankshafts of internal combustion engines because of several factors. Alternating torques are generated by the slider crank mechanism .... There is inherently little damping in a crankshaft to reduce the vibration If torsional vibration ... normally reduces the motion at the rear of the engine . This potentially damaging vibration is often ... dampers consist of an inertia ring in a viscous fluid. The torsional vibration of the crankshaft forces the fluid through narrow passages that dissipates the vibration as heat. The viscous torsional .... This type of damper reduces the vibration at specific engine speeds when an excitation ... an earthquake. Measuring torsional vibration on physical systems The most common way to measure torsional vibration is the approach of using equidistant pulses over one shaft revolution. Dedicated ... or bar Torque Bibliography Nestorides, E.J., BICERA A Handbook on Torsional Vibration , University Press, 1958, ISBN 0521043263 External links http www.lmsintl.com Ford test lab Torsional Vibration Application ... more details
unreferenced date November 2011 Vibration galvanometer is a type of mirror galvanometer , usually of the type of a coil suspended in the gap of a magnet. The natural oscillation frequency of the moving parts is carefully tuned to a specific frequency commonly 50 or 60 Hz. Higher frequencies up to 1 kHz are possible. Since the frequency depends on the mass of the moving elements, high frequency vibration galvanometers are very small with light coils and mirrors. The tuning of the vibration galvanometer is done by adjusting the tension of the suspension spring. The vibration galvanometer is used for detecting alternating currents in the frequency of its natural resonance. Most common application is as a null indicating instrument in AC bridge circuit s and current comparators. The sharp resonance of the vibration galvanometer makes it very sensitive to changes in the measured current frequency and it can be used as an accurate tuning device. Category Measuring instruments ... more details
In mechanical engineering , random vibration is motion which is non deterministic, meaning that future behavior cannot be precisely predicted. The randomness is a characteristic of the excitation or input, not the normal modes mode shapes or natural frequencies. Some common examples include an automobile riding on a rough road, wave height on the water or the load induced on an airplane wing during flight. Structural response to random vibration is usually treated using statistical or probabilistic approaches. In mathematical terms, random vibration is characterized as an ergodic and stationary process . A measurement of the acceleration spectral density ASD is the usual way to specify random vibration. The root mean square acceleration Grms is the square root of the area under the ASD curve in the frequency domain. The Grms value is typically used to express the overall energy of a particular random vibration event and is a statistical value used in mechanical engineering for structural design and analysis purposes. Image randomvibe4.png thumb Typical Random Vibration in the time domain While the term power spectral density PSD is commonly used to specify a random vibration event, ASD is more appropriate when acceleration is being measured and used in structural analysis and testing. Test specification can be established from real environment measurements using an ASD envelope or a fatigue damage equivalence criterion Extreme response spectrum and Fatigue damage spectrum . See also Random noise External links http femci.gsfc.nasa.gov random NASA Goddard website about random vibration analysis http analyst.gsfc.nasa.gov ryan MOLA random.html NASA Mars Orbiter website Random Vibrations, Spectral & Wavelet Analysis , D.E. Newland Lalanne, C., Mechanical Vibration and Shock Analysis. Volume 3 Random Vibration , Second Edition, ISTE Wiley, 2009. mech engineering stub Category Mechanical vibrations ... more details
the Single music single Why Worry 1977 , Israel Vibration recorded three albums The Same Song , Unconquered ... Vibration, backed by longtime associates Roots Radics . Discography ol li The Same Song 1978 li ... 1990 li li Dub Vibration Israel Vibration in Dub 1990 li li Forever 1991 li li Vibes Alive 1992 li ... Knights 2010 li ol External links http www.rasrecords.com israelvibration RAS Records Israel Vibration http www.vitalspot.com israelvibration Vital Spot Israel Vibration DEFAULTSORT Israel Vibration Category Jamaican reggae musical groups Jamaica stub Caribbean band stub de Israel Vibration fr Israel Vibration it Israel Vibration he ht Israel Vibration hu Israel Vibration nl Israel Vibration pl Israel Vibration pt Israel Vibration sv Israel Vibration ... more details
inadequate lead date December 2011 cleanup rewrite date December 2011 undue date December 2011 Vibration isolation is the process of isolating an object, such as a piece of equipment, from the source of vibration s. Passive isolation Passive vibration isolation systems consist essentially of a mass, spring device spring and dashpot damper dash pot . Negative Stiffness Vibration Isolator POV section date December 2011 Negative Stiffness Mechanism NSM vibration isolation systems offer a unique passive approach for achieving low vibration environments and isolation against sub Hertz vibrations. Snap ... enable vibration sensitive instruments such as scanning probe microscopes, micro hardness testers and scanning electron microscopes to operate in severe vibration environments sometimes encountered, for example ... isolation systems. Similarly, they enable vibration sensitive instruments to produce better ... vibration isolation systems is summarized, some typical systems and applications are described, and data ... the spring supports the weight W. File Vertical Vibration Isolator Drawing.jpg Horizontal Motion ... Vibration Isolator Beam Column Drawing.jpg Six Degree of Freedom six DOF Isolation A six DOF ... motion isolator on top of a vertical motion isolator. Figure 3 shows a schematic of a vibration ... positions. File Negative Stiffness Vibration Isolator Drawing.jpg Vibration isolation of supporting joint Image Vibration isolation.jpg 400px right The equipment and gears have joint with surrounding objects the supporting joint with the support the unsupporting joint the pipe duct or cable . Vibration isolation of supporting joint is realized in the device named vibration isolator absorber . On an illustration ... installation of the functioning gear on vibration isolator and after installation in a wide range of frequencies. The Vibration Isolator Image Vibration isolator.jpg 340px right A device that reflects ..., with the aid of effect of a vibration insulation. Vibration isolator is established between a body ... more details
Infobox album See Wikipedia WikiProject Albums Name Rastaman Vibration Type Studio album Artist Bob Marley & The Wailers Cover BobMarley RastamanVibration.jpg Released April 30, 1976 Recorded Harry J Harry J. Studios , Joe Gibbs record producer Joe Gibbs Studio , Kingston, Jamaica Kingston , Jamaica , late 1975 early 1976 Genre Reggae Length 35 21 Label Island Records Island br Tuff Gong reissue Producer Bob Marley & The Wailers Last album Live Bob Marley and the Wailers album Live br 1975 This album Rastaman Vibration br 1976 Next album Exodus Bob Marley & The Wailers album Exodus br 1977 Album ratings rev1 Allmusic rev1score Rating 4 5 ref Allmusic class album id r103779 pure url yes Allmusic ... artists bobmarley albums album 215654 review 5941619 rastaman vibration Rolling Stone ... bobmarley albums album 215654 review 5946746 rastaman vibration Rolling Stone review ref Automatically generated by DASHBot Rastaman Vibration is a roots reggae album by Bob Marley & The Wailers released ... Rita , Positive Vibration and Roots Rock Reggae from the 1976 album Rastaman Vibration , along with Inna ... Album 1976 Side One Positive Vibration Vincent Ford 3 33 Roots, Rock, Reggae Vincent Ford 3 38 Johnny ... Marley CD Version Positive Vibration 3 33 Roots, Rock, Reggae 3 38 Johnny Was 3 48 Cry To Me 2 36 ... Live Original Mix 4 17 Deluxe Edition 2002 Disc One Remastered Positive Vibration 3 33 Roots, Rock, Reggae ... Alternate Album Mix 4 03 Johnny Was Unreleased Alternate Album Mix 3 41 Disc Two Rastaman Vibration .... Rastaman Vibration is more like a dub kinda album and it s come without tampering y know. Like ... Universal Deluxe Editions de Rastaman Vibration es Rastaman Vibration fr Rastaman Vibration it Rastaman Vibration ka Rastaman Vibration hu Rastaman Vibration ja no Rastaman Vibration pl Rastaman Vibration pt Rastaman Vibration ru Rastaman Vibration fi Rastaman Vibration sv Rastaman Vibration ... more details
Refimprove date January 2010 In mathematics in particular geometry and trigonometry and all natural science s including astronomy, geophysics, etc , the angular distance angular separation , apparent distance , or apparent separation between two point objects, as observed from a location different from either of these objects, is the size of the angle between the two directions originating from the observer and pointing towards these two objects. Angular distance or separation is thus synonymous to angle itself, but is meant to suggest the often large or unknown linear distance between these objects for instance stars, as they are observed from Earth . Measurement Since the angular distance or separation is conceptually identical to an angle, it is measured in the same Units of measurement units , such as Degree angle degrees or radian s, using instruments such as goniometer s or optical instruments specially designed to point in well defined directions and record the corresponding angles such as telescope s . Equation Unreferenced section date August 2010 In order to calculate the angular distance in arcseconds for binary star system , extrasolar planet s, solar system solar system objects and other astronomical object s, we use orbital distance semi major axis in Astronomical unit AU divided by stellar distance in parsec s. math theta frac a D math See also Angular mil Grad angle Hour angle Central angle Angular diameter References MathWorld title Angular Distance urlname AngularDistance DEFAULTSORT Angular Distance Category Angle Category Astrometry Category Trigonometry ca Dist ncia angular es Separaci n angular fr Distance angulaire ko no Vinkelavstand sv Vinkelavst nd th tr A sal uzakl k zh ... more details
Classical mechanics cTopic Fundamental concepts Angular acceleration is the rate of change of angular velocity . In SI units, it is measured in radian s per second squared rad s sup 2 sup , and is usually denoted by the Greek letter alpha letter alpha . ref http theory.uwinnipeg.ca physics circ node3.html ref Mathematical definition The angular acceleration can be defined as either math alpha frac d omega dt frac d 2 theta dt 2 math , or br math alpha frac a T r math , where math omega math is the angular velocity , math a T math is the linear tangential acceleration , and r usually defined as the radius of the circular path of which a point moving along is the distance from the origin of the coordinate system that defines math theta math and math omega math to the point of interest. Equations of motion For two dimensional rotation rotational motion , Newton s laws of motion Newton s second law Newton s second law can be adapted to describe the relation between torque and angular acceleration math tau I alpha math , where math tau math is the total torque exerted on the body, and math ... constant values of the torque, math tau math , of an object, the angular acceleration will also be constant. For this special case of constant angular acceleration, the above equation will produce a definitive, constant value for the angular acceleration math alpha frac tau I . math Non constant acceleration For any non constant torque, the angular acceleration of an object will change with time .... It is also the best way to calculate the angular velocity. See also Angular momentum Angular speed Angular velocity Rotation Spin physics Spin References reflist Category Physical quantities ar be be x old bs Ugaono ubrzanje ca Acceleraci angular ... angular fr Acc l ration angulaire ko hr Kutno ubrzanje id Percepatan sudut is Hornhr un ... nl Hoekversnelling ja no Vinkelakselerasjon km pl Przyspieszenie k towe pt Acelera o angular ... more details
Infobox Artery Name PAGENAME Latin arteria angularis GraySubject 144 GrayPage 556 Image Gray515.png Caption Bloodvessels of the eyelids, front view. 1, supraorbital artery and supraorbital vein 2, nasal artery 3, angular artery, the terminal branch of 4, the facial artery 5, suborbital artery 6, anterior branch of the superficial temporal artery 6 , malar branch of the transverse artery of the face 7, lacrimal artery 8, superior palpebral artery with 8 , its external arch 9, anastomoses of the superior palpebral with the superficial temporal and lacrimal artery lacrimal 10, inferior palpebral artery 11, facial vein 12, angular vein 13, branch of the superficial temporal vein . Image2 Gray508.png Caption2 The arteries of the face and scalp. Angular labeled at center right. BranchFrom facial artery BranchTo Vein angular vein Supplies MeshName MeshNumber DorlandsPre a 61 DorlandsSuf 12153452 The angular artery is the terminal part of the facial artery it ascends to the medial angle of the eye s orbit , imbedded in the fibers of the angular head of the Quadratus labii superioris , and accompanied by the angular vein . On the cheek it distributes branches which anastomose with the infraorbital artery infraorbital after supplying the lacrimal sac and Orbicularis oculi , it ends by anastomosing with the dorsal nasal branch of the ophthalmic artery . Additional images gallery Image Lateral head anatomy detail.jpg Lateral head anatomy detail Image Head ap anatomy.jpg Head anatomy anterior view gallery External links eMedicineDictionary Angular artery http www.stchas.edu divisions aao ace science modelpics circulatory head.shtml Diagram at stchas.edu Gray s circulatory stub Arteries of head and neck Category Arteries of the head and neck de Arteria angularis es Arteria angular nl Arteria angularis ja nds Arteria angularis pt Art ria angular ... more details
Dongling Vibration zh c p D ngl ng Zh nd ng is a top level VibrationVibration testing vibration test equipment manufacture company. ref cite web url http www.ce.cn xwzx gnsz gnleft mttt 200804 23 t20080423 15253901.shtml title Dongling Vibration s Technology Is Top Three in the World publisher date 2008 04 23 accessdate 2009 11 04 language Chinese ref ref cite web url http www.xhby.net xhby content 2007 01 19 content 1520756.htm title publisher Xinhua Daily date 2007 01 19 accessdate 2009 11 04 language Chinese ref ref cite web url http unn.people.com.cn GB 9072277.html title CE publisher People s Daily Online date 2009 04 02 accessdate 2009 11 04 language Chinese ref Founded in 1995 in Suzhou , P.R China , it has over 250 employees, most of whom work in its headquarter in Suzhou , P.R.China, which is called Dongling Science and Technology Park. At the moment, Dongling Vibration holds stakes in several subsidiaries Siliyo, ref http www.siliyo.com English En CoProfile.asp?Action Profile Siliyo ref , which specializes in shock and bump test tools ATW Dongling ref http www.assembly testww.com English contact Pages china.aspx ATW Dongling ref , a joint venture of Dongling and ATW ref http www.assembly testww.com English Pages default.aspx ATW ref , in auto engine and Transmission mechanics transmission cold test equipment Hangzhou Inter Measure, who builds Amber, an electrodynamic shaker controller Lingyun, a large electro hydraulic servo simulation test system provider and Changling Test Service Center, who provides environmental tests service to customers. Dongling s vibration shakers are sold in North America market under the Brand brand name of Dynamic Solutions. ref http www.dynsolusa.com Dynamic Solutions official website ref In 20005, Donging received government s award for its role in testing Shenzhou 6 . ref cite web url http www.js.xinhuanet.com xin wen zhong xin 2005 10 09 content 5297964.htm title Dongling Safeguards ... more details
Infobox Vein Name Angular vein Latin vena angularis GraySubject 167 GrayPage 645 Image Gray557.png Caption Veins of the head and neck. Angular visible at center right. Image2 Caption2 DrainsFrom Source Supraorbital vein supraorbital DrainsTo facial vein facial Artery angular artery MeshName MeshNumber DorlandsPre v 05 DorlandsSuf 12849406 The angular vein formed by the junction of the frontal vein and supraorbital vein , runs obliquely downward, on the side of the root of the Human nose nose , to the level of the lower margin of the orbit, where it becomes the anterior facial vein . It receives the external nasal veins of the ala nasi , and communicates with the superior ophthalmic vein through the nasofrontal vein , thus establishing an important anastomosis between the anterior facial vein and the cavernous sinus . Additional images gallery Image Gray515.png Bloodvessels of the eyelids, front view. Image Lateral head anatomy detail.jpg Lateral head anatomy detail Image Head ap anatomy.jpg Head anatomy anterior view gallery External links eMedicineDictionary Angular vein http www.dartmouth.edu humananatomy figures chapter 47 47 5.HTM Gray s VeinsHeadNeck circulatory stub Category Veins of the head and neck de Vena angularis es Vena angular ja th ... more details
This gyroscope remains upright while spinning due to its angular momentum. In physics , angular momentum ... that can be used to describe the overall state of a physical system. The angular momentum L of a particle ... p m v is its linear momentum , and denotes the cross product . The angular momentum of a system of particles e.g. a rigid body is the sum of angular momenta of the individual particles. For a rigid body rotating around an axis of symmetry e.g. the blades of a ceiling fan , the angular momentum can ... to changes in its rotation rate and its angular velocity math mathbf L I boldsymbol omega , . math In this way, angular momentum is sometimes described as the rotational analog of linear momentum . Angular momentum is conservation laws conserved in a system where there is no net external torque ... of angular momentum. The very high rotational rates of neutron star s can also be explained in terms of angular momentum conservation. Moreover, angular momentum conservation has numerous applications in physics and engineering e.g. the gyrocompass . Angular momentum in classical mechanics File Torque animation.gif frame right Relationship between force F , torque , momentum p , and angular momentum L vectors in a rotating system Definition The angular momentum L of a particle about a given ... the cross product . As seen from the definition, the derived SI unit s of angular momentum are newton ... about a fixed symmetry axis, the angular momentum is expressed as the product of the moment of inertia of the object and its angular velocity vector math mathbf L I boldsymbol omega math where I is the moment of inertia of the object in general, a tensor quantity , and is the angular velocity . The angular momentum of a particle or rigid body in rectilinear motion pure translation is a vector ... the given origin, its angular momentum is zero. Angular momentum is also known as moment physics moment of momentum . Angular momentum of a collection of particles If a system consists of several ... more details
main Earthquake engineering In earthquake engineering , vibration control is a set of technical means aimed to mitigate seismic Earthquake Effects.2Fimpacts of earthquakes impacts in building and non building structures. All seismic vibration control devices may be classified as passive , active or hybrid http physics animations.com Physics English spri txt.htm where Image LRBtest.jpg thumb 592 445 px right Base isolation Base isolator being tested at the UCSD Caltrans SRMD facility passive control devices have no feedback capability between them, structural elements and the ground active control devices incorporate real time recording instrumentation on the ground integrated with earthquake input processing equipment and actuator s within the structure hybrid control devices have combined features of active and passive control systems. ref name ActiveHybrid cite book title Active, Hybrid and Semi Active Structural Control author Chu, S.Y. Soong, T.T. Reinhorn, A.M. date 2005 publisher John Wiley & Sons isbn 0470013524 ref When ground seismic waves reach up and start to penetrate a base of a building, their energy flow density, due to reflections, reduces dramatically usually, up to 90 . However, the remaining portions of the incident waves during a major earthquake still bear a huge devastating potential. After the seismic waves enter a superstructure , there is a number of ways to control them in order to sooth their damaging effect and improve the building s seismic performance ... . In refineries or plants snubbers are often used for vibration control. Snubbers come in two different ... id 2745&lang en Vibration monitoring by Terrestrial RADAR Interferometry dmoz Science Technology Structural ... foundation Earthquake Protective Building Buffer Tuned mass damper Dynamic Vibration Absorber Cushioning Vibration isolation References reflist 2 Category Building Category Earthquake engineering Category Seismic vibration control ru simple Vibration control ... more details
Taxobox name Angular roughshark status VU status system IUCN3.1 trend image Oxynotus centrina Gervais.jpg image caption regnum Animal ia phylum Chordate Chordata classis Chondrichthyes subclassis Elasmobranchii ordo Squaliformes familia Oxynotidae genus Oxynotus species O. centrina range map Oxynotus centrina distmap.png range map width 200px range map caption Range of the angular roughshark in blue binomial Oxynotus centrina binomial authority Carolus Linnaeus Linnaeus , 1758 Portal Sharks The angular roughshark , Oxynotus centrina , is a sleeper shark of the family biology family Oxynotidae . It reaches a length of about 1.5 m 5 ft . References FishBase species genus Oxynotus species centrina month July year 2006 Selachimorpha D. DEFAULTSORT Angular Roughshark Category Oxynotidae shark stub ca Porc mar de Gefleckte Meersau es Oxynotus centrina it Oxynotus centrina nl Strijkijzerruwhaai pl Br zosz sv Trekantshaj tr Oxynotus centrina ... more details
Distinguish angular velocity Image AngularFrequency.gif thumb Angular frequency omega in radians per second , is larger than frequency nu letter in cycles per second, also called Hertz Hz , by a factor of 2 . Classical mechanics cTopic Fundamental concepts In physics , angular frequency also referred to by the terms angular speed , radial frequency , circular frequency , orbital frequency , and radian frequency is a scalar measure of rotation rate. Angular frequency or angular speed is the magnitude of the vector quantity angular velocity . The term angular frequency vector math vec omega math is sometimes used as a synonym for the vector quantity angular velocity . ref name UP1 cite book last Cummings first Karen authorlink coauthors Halliday, David title Understanding physics publisher John Wiley & Sons Inc., authorized reprint to Wiley India date Second Reprint 2007 location New Delhi pages 449, 484, 485, 487 url http books.google.com ?id rAfF X9cE0EC&printsec copyright doi id ...&pg PA200&dq angular frequency doi id isbn 978 0 7645 5433 9 ref math omega 2 pi over T 2 pi f frac v r , math where is the angular frequency or angular speed measured in radians per second , T is the Frequency ... s . Units In SI units, angular frequency is normally presented in radian s per second , even when it does ... 978 0 86720 479 7 date 1996 01 01 ref In digital signal processing , the angular frequency may be normalized ...&pg PA376&dq angular frequency doi id isbn 978 0 534 46479 0 ref math omega 2 frac k m , math ... which can sometimes be denoted as sub 0 sub . LC Circuits The resonant angular frequency in an LC ... http books.google.com ?id nrxT9Qjguk8C&pg PA103&dq angular frequency doi id isbn 0 07 139307 2 LC1 ref math omega sqrt 1 over LC math See also Orders of magnitude angular velocity Simple harmonic motion ... ?id xMWwTpn53KsC&pg RA1 PA383&dq angular frequency doi id isbn 978 0 521 17592 8 Please check ISBN reason Check digit 8 does not correspond to calculated figure. External links DEFAULTSORT Angular ... more details
Image Angular aperture.svg right The angular aperture of a thin lens with focal point at F and an aperture of diameter math d math . thumb 250px The angular aperture of a lens optics lens is the apparent angle of the lens aperture as seen from the Focus optics focal point math a 2 arctan left frac D 2 f right math where math f math is the focal length math D math is the diameter of the aperture . Relation to numerical aperture In a medium with an index of refraction close to 1, such as air, the angular aperture is approximately equal to twice the numerical aperture of the lens. ref cite book title Studies in Optics author Albert Abraham Michelson year 1995 publisher Courier Dover pages 32 isbn 0 486 68700 7 url http books.google.com books?id m2tUZ4 8WGMC&pg PA32&dq 22Angular aperture 22&ie ISO 8859 1&output html ref Formally, the numerical aperture in air is math mathrm NA sin a 2 sin arctan left frac D 2 f right math In the paraxial approximation , with a small aperture, math D f math math mathrm NA approx a 2 math References reflist See also f number Numerical aperture Category Optics Category Angle de ffnungswinkel es Apertura angular it Apertura angolare nl Openingshoek zh ... more details
Infobox disease Name Angular cheilitis Image Angular Cheilitis.JPG Caption Affected area within the black oval DiseasesDB none ICD10 ICD10 K 13 0 k 00 ICD9 ICD9 528.5 , ICD9 686.8 ICDO OMIM MedlinePlus none eMedicineSubj none eMedicineTopic MeshID Angular cheilitis also called perl che ref name Andrews cite book author James, William D. Berger, Timothy G. et al. title Andrews Diseases of the Skin clinical Dermatology publisher Saunders Elsevier location year 2006 pages isbn 0 7216 2921 0 oclc doi accessdate ref Rp 309 date May 2009 , cheilosis or angular stomatitis is an inflammatory lesion at the labial ... Ulcer dermatology ulcers or a crust may form. Signs and symptoms Angular cheilitis causes red, wet ... coauthors Brodell, RT, Helms, SE title Angular cheilitis, part 1 local etiologies. journal Cutis cutaneous ... Causes File Photographic Comparison of a Canker Sore, Herpes, Angular Cheilitis and Chapped Lips..jpg thumb Photographic Comparison of 1 a Canker Sore inside the mouth, 2 Herpes, 3 Angular Cheilitis ... chapped lips herpes canker sore angular cheilitis cyst The Center for Special Dentistry . ref Although the sores of angular cheilitis may become infected by the fungus Candida albicans thrush , or other pathogen s, studies have linked the initial onset of angular cheilitis with nutritional deficiencies ... e.g. celiac disease . Zinc deficiency has also been associated with angular cheilitis. ref name ... not associated Angular chelitis can also be a sign of anorexia nervosa and or bulimia nervosa due ... the condition called Plummer Vinson syndrome aka Paterson Brown Kelly syndrome . Angular cheilitis occurs ... ref Angular cheilitis can be caused by bacteria, but is more commonly a fungal infection. It can ... of vitamin supplements. Treatment Treatment of angular cheilitis varies depending on the cause ... . ref http www.aolhealth.com conditions angular cheilitis Angular Cheilitis , AOL Health ref References ... angular fr Perl che it Cheilite angolare nl Perl che ja pl Zapalenie k t w ust pt Quelite angular ... more details
A molecular vibration occurs when atoms in a molecule are in Periodic function periodic motion while ... motion is known as a vibration frequency, and the Resonance Raman spectroscopy Molecular Vibrations ... normal modes of vibration , but a linear molecule has 3 N 5 such modes, as rotation about its molecular ... normal mode of vibration. The normal modes of vibration of polyatomic molecules are independent of each ... such as different chemical bonds. A molecular vibration is excited when the molecule absorbs a quantum of energy, E , corresponding to the vibration s frequency, , according to the relation E h where h is Planck constant Planck s constant . A fundamental vibration is excited when one such quantum ... vibration can be described as a kind of simple harmonic motion . In this approximation, the vibrational ... typically uses visible light, can also be used to measure vibration frequencies directly. Vibrational ... excitation of a vibration and rotations gives rise to Rovibrational coupling vibration rotation spectra. Vibrational coordinates The coordinate of a normal vibration is a combination of changes in the positions of atoms in the molecule. When the vibration is excited the coordinate changes sinusoidally with a frequency , the frequency of the vibration. Internal coordinates Eckart conditions ... to a normal mode of vibration. Each normal mode is assigned a single normal coordinate, and so ... vibrations, so each normal mode is an independent molecular vibration, associated with its own spectrum ..., molecular vibrations can be treated using Newtonian mechanics to calculate the correct vibration frequencies. The basic assumption is that each vibration can be treated as though it corresponds ... is math Q t A cos 2 pi nu t nu 1 over 2 pi sqrt k over mu . math A is the maximum amplitude of the vibration ... of the molecule is not affected by the vibration. In the harmonic approximation the potential ... must be performed see GF method . The vibration frequencies, sub i sub are obtained from the eigenvalues ... more details
Refimprove date September 2009 The angular diameter or apparent size of an object as seen from a given ..., the visual and actual diameters are the same. Formulas Image Angular dia formula.JPG thumb 400px right Diagram for the formula of the angular diameter The angular diameter of an object can be calculated ... is the angular diameter, and math d math and math D math are the visual diameter of and the distance ... s. For a spherical object whose actual diameter equals math d mbox act math , the angular diameter ... Image Angular diameter.jpg thumb 300px right Angular diameter the angle subtended by an object In astronomy the sizes of objects in the sky are often given in terms of their angular diameter as seen from Earth , rather than their actual sizes. Since these angular diameters are typically small ... is about 206265 arcseconds. Therefore, the angular diameter of an object with visual diameter d ... 0 538 73317 5 ref math delta math 206265 d D arcseconds. The angular diameter of Earth s orbit around the Sun, from a distance of one parsec , is 2 two arcseconds . The angular diameter of the Sun, from a distance of one light year , is 0.03 , and that of the Earth 0.0003 . The angular diameter 0.03 ... Search This table shows the angular sizes of noteworthy Astronomical object celestial bodies as seen from the Earth class wikitable Celestial body Angular diameter align left Relative size 10 ... File Comparison angular diameter solar system.svg thumb 300px Comparison of angular diameter of the Sun ..., view it from 10.3 m away. The table shows that the angular diameter of Sun, when seen from Earth is approximately 32 arcminutes 1920 arcseconds or 0.53 degrees , as illustrated above. This meaning the angular ... is 500,000 times as much the Sun is 10,000,000,000 times as bright, corresponding to an angular diameter ratio of 100,000, so Sirius is roughly 6 times as bright per unit solid angle . The angular ... is 250,000 times as much the Sun is 40,000,000,000 times as bright, corresponding to an angular ... more details
Infobox Brain Name Angular gyrus Latin gyrus angularis GraySubject GrayPage Image Brain Surface Gyri.SVG thumb Language areas of the brain Caption Legend ffac75 Angular gyrus Legend fcfb98 Supramarginal gyrus Legend b4d8ec Broca s area Legend b6cf9d Wernicke s area Legend f7a6b6 Primary auditory cortex Image2 Gray1197.png Caption2 Drawing of a cast to illustrate the relations of the brain to the skull. Angular gyrus labeled at upper left, in yellow section. IsPartOf Components Artery Vein Acronym BrainInfoType hier BrainInfoNumber 91 MeshName MeshNumber NeuroLex Angular Gyrus NeuroLexID birnlex 1376 DorlandsPre g 13 DorlandsSuf 12405109 The angular gyrus is a region of the brain in the parietal lobe , that lies near the superior edge of the temporal lobe , and immediately posterior to the supramarginal gyrus it is involved in a number of processes related to language, mathematics and cognition ... so it is in the past tense that written word is translated to internal monologue via the angular ... published a paper in 20003 in which they speculated that the angular gyrus is at least partially ... with angular gyrus lesions. It would be interesting to see whether they have deficits in other types ... pdf R H follow up.pdf ref blockquote The fact that the angular gyrus is proportionately ... angular gyrus Damage to the angular gyrus manifests as Gerstmann syndrome . Out of body experiences Recent experiments have demonstrated the possibility that stimulation of the angular gyrus is the cause ... of the angular gyrus in one experiment caused a woman to perceive a phantom existence behind her. ref ... injuries to the angular gyrus have been known to often cause arithmetic deficits. ref Henschen SL ..., the left angular gyrus together with left Inferior frontal gyrus are involved in exact calculation ... www.neuinfo.org nif nifgwt.html?query 22Angular 20Gyrus 22 NIF Search Angular Gyrus via the Neuroscience Information Framework Telencephalon Category Cerebrum de Gyrus angularis es Circunvoluci n angular ... more details
In the design of floor systems in buildings oscillation vibrations caused by walking, dancing, mechanical equipment or other rhythmic excitation may cause an annoyance to the occupants or impede the function of sensitive equipment. A calculation procedure to analyze steel framed floor systems is given in a design guide published by the American Institute of Steel Construction. Modern concrete under floors often specify a 3mm layer of sound deadening material above is it foam plastic like ethaline something with a long life since it will be expensive to replace . See also Architectural acoustics External links http www.aisc.org American Institute of Steel Construction http www.floorvibe.com Floor Vibration Analysis Software Category Building defects Category Floors architecture stub ... more details
Multiple issues refimprove July 2007 orphan July 2007 context October 2009 Transmissibility is the ratio of Input output output to Input output input . Transmissibility T output input T 1 means Amplifier amplification and maximum amplification occurs when forcing frequency f sub f sub and natural frequency f sub n sub of the system coincide. There is no unit designation for transmissibility, although it may sometimes be referred to as the Q factor. Also see Q factor DEFAULTSORT Transmissibility Vibration Category Electronics terms electronics stub ... more details
Distinguish angular frequency Classical mechanics cTopic Fundamental concepts In physics , the angular velocity is defined as the rate of change of angular displacement and is a vector geometry vector quantity more precisely, a pseudovector which specifies the angular speed of an object and the axis about which the object is rotating. The SI unit of angular velocity is radians per second , although it may be measured in other units such as degrees per second, degrees per hour, etc. Angular velocity is usually represented by the symbol omega , rarely . The direction of the angular velocity vector ..., 153 url http books.google.com books?id tOFRjXB XvMC&pg PA314&dq angular velocity&rview 1 doi isbn 978 0 13 607791 6 EM1 ref The angular velocity of a particle Particle in two dimensions Image AngularVelocity01.png right 256 px thumb The angular velocity of the particle at P with respect to the origin O is determined by the perpendicular component of the velocity vector v . Image Angular velocity.svg thumb 250px The angular velocity describes the speed of rotation and the orientation of the instantaneous axis about which the rotation occurs. The direction of the angular velocity pseudovector will be along the axis of rotation in this case counter clockwise rotation the vector points up. The angular ... in the direction of the particle relative to the origin, so for purposes of finding the angular ... motion around the origin, and the angular velocity is completely determined by this component. In two dimensions the angular velocity is given by math omega frac d phi dt math This is related ... sin theta mathrm mathbf r . math In two dimensions the angular velocity is a single number which has no direction, but it does have a sense or orientation. In two dimensions the angular velocity is a pseudoscalar ... of a rotation does not, then the sign of the angular velocity changes. Particle in three dimensions see also Frenet Serret formulas In three dimensions, the angular velocity becomes a bit more ... more details
Unreferenced date August 2008 Infobox Anatomy Name Angular incisure Latin incisura angularis GraySubject 247 GrayPage 1162 Image Gray1046.svg Caption Outline of stomach, with angular incisure stated as incisura angularis near center. Image2 Illu stomach.jpg Caption2 Diagram from http training.seer.cancer.gov ss module07 ugi unit02 sec02 anatomy.html cancer.gov BR 1. Body of stomach BR 2. Fundus stomach Fundus BR 3. Anterior wall BR 4. Greater curvature BR 5. Lesser curvature BR 6. Cardia BR 9. Pyloric sphincter BR 10. Pyloric antrum BR 11. Pyloric canal BR 12. Angular notch BR 13. Gastric canal BR 14. Rugal folds Precursor System Artery Vein Nerve MeshName MeshNumber DorlandsPre i 05 DorlandsSuf 12447228 Nearer the pyloric end of the stomach than its cardiac end is a well marked notch, the angular incisure or notch , which varies somewhat in position with the state of distension of the viscus . It serves to separate the stomach into a right and a left portion. Gray s Digestive tract Category Digestive system digestive stub fa it Incisura angolare ja ... more details
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