
	Where results make sense

Topic: Excitation

Related Topics

Blacklight

Colour

Rayleigh scattering

Ultraviolet (TV miniseries)

Visible light

In the News (Mon 7 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Excitation - Wikipedia, the free encyclopedia
		Excitation is the amount of energy (energy in a general sense, not energy as defined in physics) that Curtis has.
		In physics there is a specific technical definition for energy level which is why the word excitation has been chosen for the general case.
		In the physical world temperature is indicative of the level of excitation.
	en.wikipedia.org /wiki/Excitation (167 words)

	Olympus FluoView Resource Center: Fluorescence Excitation and Emission Fundamentals
		Excitation of a susceptible molecule by an incoming photon happens in femtoseconds (10E-15 seconds), while vibrational relaxation of excited state electrons to the lowest energy level is much slower and can be measured in picoseconds (10E-12 seconds).
		Although the entire molecular fluorescence lifetime, from excitation to emission, is measured in only billionths of a second, the phenomenon is a stunning manifestation of the interaction between light and matter that forms the basis for the expansive fields of steady state and time-resolved fluorescence spectroscopy and microscopy.
		Excitation transitions (red lines) from the ground to the excited state occur in such a short timeframe (femtoseconds) that the internuclear distance associated with the bonding orbitals does not have sufficient time to change, and thus the transitions are represented as vertical lines.
	www.olympusfluoview.com /theory/fluoroexciteemit.html (3559 words)

	Nikon MicroscopyU: Fluorescence Microscopy - Multiphoton Excitation
		However, because the photophysics governing two-photon excitation is different from that of conventional fluorescence excitation, deleterious effects are occasionally observed with two-photon excitation of certain fluorophores, which in turn limits the applicability of this method for optical sectioning in thin specimens.
		The two-photon microscope allows a greater proportion of the excitation illumination to reach the focal plane because the conditions for absorption are not met outside of the area of light concentration, and out-of-focus absorption is eliminated.
		For the one-photon excitation mechanism (confocal microscopy, Figure 5(a)), the intensity exhibits a steady decrease with penetration depth as the excitation light is increasingly absorbed as it reaches the deeper focal planes.
	www.microscopyu.com /articles/fluorescence/multiphoton/multiphotonintro.html (6506 words)

	Electron excitation - Wikipedia, the free encyclopedia
		Electron excitation is the movement of an electron to a higher energy state.
		Within a semiconductor crystal lattice, thermal excitation is a process where lattice vibrations provide enough energy to move electrons to a higher energy band.
		When an excited electron falls back to a lower energy state again, it is called electron relaxation This can be done by radiation of a photon or giving the energy to a third spectator particle as well.
	en.wikipedia.org /wiki/Electron_excitation (147 words)

	Olympus Microscopy Resource Center: Specialized Microscopy Techniques - Fluorescence - Excitation and Emission ...
		This overlap of excitation and emission intensities/wavelengths (illustrated in Figure 1(c)) must be eliminated, in fluorescence microscopy, by means of appropriate selection of excitation filter, dichromatic beamsplitter (in reflected light fluorescence), and barrier filter.
		Prior to excitation, the electron configuration of the molecule is described as being in the ground state.
		Upon absorbing the excitation light, usually of short wavelengths, electrons may be raised to a higher energy and vibrational excited state; this may take a trillionth of a second (10 to the minus 12th seconds).
	www.olympusmicro.com /primer/techniques/fluorescence/excitation.html (1612 words)

	Excitation Energy Transfer and Energy Migration : Some Basics and Background
		Excitation energy is in the form of a couple, an electron that is in the excited state of the molecule with the "hole" it has left behind in the ground state.
		In the case of bacteriochlorophyll in photosynthetic bacteria, the light quanta absorbed by two forms of this pigment (those with absorption bands at 800 nm and 850 nm) are transferred to the third one, with the absorption band at about 890 nm, and practically all fluorescence is emitted from the latter.
		Excitation energy transfer between identical pigment molecules, particularly between chlorophyll a molecules in "photosynthetic units" cannot be determined by the "sensitized fluorescence" technique, i.e., observation of acceptor fluorescence when you excite the donor molecule.
	www.life.uiuc.edu /govindjee/biochem494/foerster.htm (3711 words)

	Olympus Microscopy Resource Center: Specialized Microscopy Techniques - Multiphoton Fluorescence Excitation
		Two-photon excitation, which occurs only at the focal point of the microscope, minimizes the photobleaching and photodamage that are the ultimate limiting factors in imaging live cells.
		Excitation Region Events - In multiphoton fluorescence microscopy, excitation of fluorophores is localized to a narrow region (approximately a micron thick at high numerical aperture) encompassing the microscope focal point, thus eliminating background fluorescence and out-of-focus flare that typically limits the effective sensitivity in confocal microscopy.
		Excitation Photobleaching Patterns - Multiphoton fluorescence microscopy utilizes diffraction-limited focusing by a high numerical aperture objective to localize the spatial concentration of excitation light to narrow region near the focal point.
	www.olympusmicro.com /primer/techniques/fluorescence/multiphoton/multiphotonhome.html (799 words)

	Multi-Photon Excitation Flourescence Microscopy
		Multiple-photon excitation fluorescence microscopy is a technique that uses non-linear optical effects to achieve optical sectioning.
		Using this technique, UV excited fluorophores may be imaged with IR excitation.
		Because excitation levels are dependent on the cube of the excitation power, resolution is improved (for the same excitation wavelength) compared to two photon excitation where there is a quadratic power dependence.
	www.loci.wisc.edu /multiphoton/mp.html (731 words)

	6.9 Excitation energies
		This is because the excitation energy depends on the change in the exchange hole due to the excitation, which is not strongly localised.
		The increase in excitation energies with system size is the same trend as in HF calculations, although the finite size errors are smaller in the correlated calculations.
		One is that the excitation is ``squeezed'' into the simulation cell, and the other is that there are spurious interaction between the periodic replicas of the simulation cell.
	www.physics.uc.edu /~pkent/thesis/pkthnode53.html (2748 words)

	Excitation and Emission of Green Fluorescent Proteins \| Technical Notes
		The wild type like variants have their primary excitation peak centered on 395 nm, with an emission peak at 509 nm while the blue emitting mutants generally have an excitation peak at around 380 nm and an emission peak near 460 nm (Figure 1).
		Excitation and emission spectra of EGFP, wtGFP, and EBFP.
		Note that although the 508/20 emission filter is closer to the emission peak of the sample, overlap with the 485/20 filter precludes the use of that filter, necessitating the use of the 530/25 nm filter.
	www.biotek.com /products/tech_res_detail.php?id=54 (775 words)

	Excitation System (Site not responding. Last check: 2007-11-06)
		We are well versed in all types of excitation control systems from the early star-wheel voltage regulators onward.
		Excitation control system testing includes the interactions of all automatic voltage regulator (AVR) functions with the exciter, generator and power system.
		We regularly perform testing onsite to validate that all excitation system functions are operational, to coordinate limiting and protective functions, and to determine or validate models used in stability studies.
	www.electric-research.com /avr_and_pss_testing.htm (436 words)

	Data @ NASA GISS: Molecular Collision Excitation Rates (Site not responding. Last check: 2007-11-06)
		Rotational and vibrational excitation rates are needed to interpret microwave and infrared observations of the interstellar gas.
		Excitation rates were obtained among the lowest 34 rotational levels for temperatures between 50 and 500 K. plain text file of the published table of rates is available.
		Since hydrogen molecules outnumber He atoms by 4 or 5 to 1 in the interstellar gas excitation by hydrogen molecules is the process of most interest.
	data.giss.nasa.gov /mcrates (1624 words)

	Nikon MicroscopyU: Fluorescence Microscopy - Blue Excitation Filter Combinations - B-2A
		The set is designed as a general purpose filter combination for blue excitation, with a dichromatic mirror optimized for fluorescein isothiocyanate (FITC) coupled with counter stains such as propidium iodide (PI) or tetramethylrhodamine isothiocyanate (TRITC).
		The 500-nanometer dichromatic mirror cut-on wavelength is the lowest of all the Nikon blue excitation filter combinations, as is the longpass barrier filter cut-on wavelength of 515 nanometers.
		Nuclei in the tissue section were targeted with the nucleic acid probe DAPI, which has an excitation maximum at 358 nanometers and an emission maximum at 461 nanometers when bound to DNA in cell cultures and tissue sections.
	www.microscopyu.com /articles/fluorescence/filtercubes/blue/b2a/b2aindex.html (1065 words)

	28454 Quad Conditioner with Balanced Current Excitation
		Using a proprietary constant current source, the 28454 is able to deliver accurate excitation to the gage.
		The 28454 may be used for full bridge applications with the advantage that excitation delivered to the bridge is unaffected by excitation supply lead wire resistance.
		Excitation current flows through an accurate sense resistor in the current loop allowing for direct monitoring of the excitation current.
	www.pfinc.com /products/conditioning_systems/28000/28454.htm (1102 words)

	Coulomb Excitation (Site not responding. Last check: 2007-11-06)
		During the bombardment, a strong, varying electromagnetic field acts, and the nucleus is forced into an excited state because of the electromagnetic interaction between the nuclear charge and the field.
		The reaction mechanism has been studied extensively and the excitation process is well understood, since it is very often considered as an inverse electromagnetic decay process.
		The one-step excitation can be described in terms of perturbation theory, while the multiple excitation can be explained by a time-dependent Hamiltonian acting on the system.
	www.nscl.msu.edu /~mertzime/Thesis/node7.html (278 words)

	DVSI Multi-Band Excitation
		The original goal of this work was to develop a robust speech model that would outperform the linear prediction speech model used in traditional speech coders.
		This allows the excitation signal for a particular speech segment to be a mixture of periodic (voiced) and noise-like (unvoiced) energy.
		This added degree of freedom in the modeling of the excitation signal allows the MBE speech model to generate higher quality speech than conventional speech models.
	www.dvsinc.com /papers/mbe.htm (568 words)

	CO Rotational Excitation in Diffuse ISM
		In such a circumstance, the radiative excitation is easily estimated from the CO brightness temperature of the dense CO cloud.
		Because the radiative excitation results from absorption of spectral line radiation, the relative velocities of the diffuse and the dense gas must be considered: specifically, the radial velocity of one as viewed by the other.
		Nonetheless, it is straightforward to evaluate the excitation temperature for a molecule, irradiated by the CBR and a nearby dense cloud.
	ecf.hq.eso.org /~ralbrech/sepdec97apjl/975040.html (3498 words)

	How Do I Enable IEPE Excitation on My DSA Device Using Traditional DAQ? - KnowledgeBase - Support - National Instruments
		This VI allows you to arbitrarily control excitation on all configured channels on the NI 4472 device with a single function call.
		Excitation Control Array: You should wire this terminal only if you want to enable excitation on some configured channels, but not on all.
		IEPE excitation generates a DC current, and this will result in a significant DC offset in the signal coming from your transducer.
	digital.ni.com /public.nsf/allkb/90E485A463517C3686256A41005B2D2C (663 words)

	Static Excitation Systems - Beckwith Systems Engineering (BSE) - Beckwith Electric Co, Inc. - Services and Products for ...
		Today's excitation systems improve generator performance, reduce maintenance costs, and streamline operator interface.
		Static excitation systems can be designed for both new and existing installations.
		Beckwith Electric's Excitation Systems are designed for synchronous generators from a few MW up to the largest machines in operation.
	www.beckwithelectric.com /bse/excitation.htm (304 words)

	► Excitation (Site not responding. Last check: 2007-11-06)
		The excitation system of a synchronous generator enables to supply the energy of a drive engine
		Therefore high priority is assigned to the reliability and availability in case of system choice of excitation systems.
		In case of still economically justifiable maintenance of pilot exciters and when there is no high requests on the regulation dynamics and on the improvement of the efficiency, the operation performance improvement can be achieved by exchanging an existing
	www.sat-automation.com /english/neptun-excitation.htm (198 words)

	Technorati Tag: excitation (Site not responding. Last check: 2007-11-06)
		Look up Excitation Now Look up words with the click of a mouse.
		To contribute to this page, just post to your blog and include this code.
		Posts tagged Excitation per day for the last 30 days.
	technorati.com /tag/excitation (361 words)

	Static Excitation System Options
		Our systems are custom designed to match a particular specification and can offer a wide range of options and accessories.
		The RDP-300 Remote Display Panel is a Human-Machine Interface (HMI) used with single or dual DECS-200 or DECS-300 based Digital Excitation Control Systems to provide remote control, to view metered quantities, and to provide annunciation of digital controller status and alarms.
		May be located up to 4000 feet away from the DECS-200 or DECS-300
	www.basler.com /html/sesopt.htm (173 words)

Try your search on: Qwika (all wikis)