
	Where results make sense

Topic: Ice nucleus

Related Topics

Nina May

Carp

Twin prime

Jehoshua

Nemedians

Shao Kahn

Chenla

Palisadoes

Sumqayit

Satem

In the News (Mon 21 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Nucleus - Wikipedia, the free encyclopedia
		Galaxy nucleus, the central region of a galaxy
		Ice nucleus, the center of an ice crystal
		"Nucleus" is New Latin, the diminutive of the Latin nux (nut).
	en.wikipedia.org /wiki/Nucleus (220 words)

	Ice nucleus - Wikipedia, the free encyclopedia
		Ice nuclei are particles that act as nuclei for the formation of ice crystals in the atmosphere.
		The presence of an ice nucleus can also cause a previously supercooled water droplet to freeze through contact, immersion or dissolution within the water that would otherwise have stayed in the liquid phase at a given temperature.
		Ice particles can have a significant effect on cloud dynamics.
	en.wikipedia.org /wiki/Ice_nucleus (264 words)

	Encyclopedia :: encyclopedia : Atomic nucleus (Site not responding. Last check: 2007-11-01)
		The nucleus (atomic nucleus) is the center of an atom.
		The number of protons in an atomic nucleus is called the atomic number, and determines which chemical element the atom is. For example, a nucleus with one proton (which is the only nucleus that may have no neutrons) constitutes an atom of hydrogen, with six protons, carbon, or with eight, oxygen.
		A heavy nucleus can contain hundreds of nucleons (neutrons and protons), which means that to some approximation it can be treated as a classical system, rather than a quantum-mechanical one.
	www.hallencyclopedia.com /Atomic_nucleus (911 words)

	Nucleus
		In astronomy, the central region of a galaxy is referred as the galaxy nucleus[?].
		In meteorology, an ice crystal is formed around an ice nucleus.
		Nucleus[?]: In linguistics, this is the center part of a syllable, most often a vowel.
	www.ebroadcast.com.au /lookup/encyclopedia/nu/Nuclei.html (167 words)

	AMS Glossary
		The process is inferred from the observation that ice particle concentration often exceeds that of ice nuclei, sometimes by several orders of magnitude.
		Currently the following mechanisms are thought to be responsible for the ice multiplication phenomenon: 1) mechanical fracturing of ice crystals during evaporation; 2) shattering or partial fragmentation of large drops during freezing; and 3) ice splinter formation during the riming of ice particles (Hallett–Mossop process).
		The ice layer may form either by the accretion of droplets upon the snow pellet or by the melting and refreezing of the surface of the snow pellet.
	amsglossary.allenpress.com /glossary/browse?s=i&p=6 (673 words)

	Freeindiamedia.com, Express your impartial, radical, grassroot views on current issues. (Site not responding. Last check: 2007-11-01)
		Resuming your biology lesson, please note that the nucleus of most cells averages about 5 ìm (.005 mm) in diameter, and that it is surrounded by the nuclear envelope, a double membrane made of proteins and lipids that separates it from the cytoplasm, as Contexo.Info says.
		Nucleus, as in physics, is the core of an atom that contains protons and neutrons and thus contains almost all of the atom's mass.
		Comet nucleus is the solid core of a comet; galaxy nucleus is the central region of a galaxy; ice nucleus, the centre of an ice crystal; sentence nucleus is the syllable which receives the greatest stress in a word; and Nucleu s is also a British jazz-rock band led by Ian Carr.
	www.freeindiamedia.com /politics/25_july_05_politics1.htm (1057 words)

	Climatic calendaricities & meteor displays
		In order to qualify, the surface of an ice nucleus must be compatible with the crysta!line structure of ice; however, at colder temperatures the degree of compatibility is less critical because ice forms more readily.
		At -l5ºC the ice nucleus concentration of the atmosphere is often less than one per litre; at -25ºC it might be as high as 10 or even 50 per litre.
		Another question which deserves serious consideration is the possibility of the meteoric source of ice nuclei attaining greater importance in the southern hemisphere, because of the smaller area of land and the consequent dearth of soil-derived nuclei.
	www.fortunecity.com /meltingpot/melwood/368/metrain.html (3339 words)

	Method and apparatus for modifying supercooled clouds - Patent 6056203
		In the former, growth of ice crystals represents the mechanisms of snowfall; and in the latter, the growth of graupel and hail.
		The mechanism of the ice formation is believed to be largely due to condensation of water vapor in the form of small droplets followed by their freezing due to the strong cooling.
		The mechanism of ice nucleation is complex, and the ice nucleating ability sharply depends on cloud temperature, reducing it by a factor of 10.sup.3 for a temperature rise from -10 to -5.degree.
	www.freepatentsonline.com /6056203.html (3545 words)

	ANATOMY OF COMETS (Site not responding. Last check: 2007-11-01)
		Nucleus: "dirty ice balls" which are the icy equivalent of asteroids.
		Dust tail: composed of small (smoke-sized) dust particles driven off the nucleus by escaping gases; this is the part of a comet that is easiest to see, and is not as long as the ion tail.
		of a comet is an irregular ball of ice and dust typically 1 to 10 km in diameter.
	www.il-st-acad-sci.org /planets/comets3.html (906 words)

	NOAA's National Weather Service - Glossary
		Ice crystals are so small that they seem to be suspended in air.
		In hydrologic terms, compression of an ice cover particularly at the front of a moving section of ice cover.
		An ice storm is used to describe occasions when damaging accumulations of ice are expected during freezing rain situations.
	www.nws.noaa.gov /glossary/glossary.php?letter=i (2618 words)

	[No title]
		A thin ice crystal floating high in the atmosphere in certain conditions of clear, cold weather.
		The thawing of ice on the surface of a body of water, such as a lake.
		The temperature, equal to 1.0?C (33.8?F), at which pure water and ice are in equilibrium in a mixture at 1 atmosphere of pressure.
	www.okstate.edu /faculty/hydrology/index_files/sheet010.htm (8357 words)

	Experiment 2: Bacterial ice nucleation: (Site not responding. Last check: 2007-11-01)
		ice nucleus, or template on which an ice crystal can be built.
		Ps is on the leaves of the plant, the bacterium can act as an ice nucleus, and ice crystals may form and damage the plant tissue.
		Ps is active as an ice nucleus and to determine the effects of supercooling vs. ice formation on plant tissue.
	www.plantpath.wisc.edu /fac/joh/Exp2StudentGuide.htm (681 words)

	Chapter 6.2
		The transition between liquid water and ice is one of the most commonly observed events in nature, but like the question of why the sky is blue, the question of why water freezes when it gets cold is one that's rarely given much attention.
		When ice and water coexist at the freezing point, the amount of ice remains constant as long as no heat is either added or removed from the mixture.
		When a certain amount of ice has formed, then the solution at the interface will have a freezing point equal to the temperature of the interface; at this point, ice growth will be limited by diffusion of the solute away from the crystal.
	www.ucalgary.ca /~kmuldrew/cryo_course/cryo_chap6_2.html (2963 words)

	Experiment 2: Bacterial ice nucleation: (Site not responding. Last check: 2007-11-01)
		Bacterial ice nucleation is a simple experiment that can be completed and analyzed in a single class period.
		The ice nucleation experiment is appropriate for the beginning of the semester because it is technically simple and the experimental treatments and controls are fairly obvious.
		Pseudomonas syringae is thought to function as an ice nucleus and the importance of ice nucleation in biotechnology).
	www.plantpath.wisc.edu /fac/joh/Exp2TeachGuide.htm (1721 words)

	Precipitation Enhancement---Winter Clouds
		This work pointed to the need for direct measurements of ice crystal concentrations in the seeded portion of the cloud to overcome uncertainty in the ice nucleus measurements, in addition to the challenge to consistently target regions of supercooled liquid water with adequate numbers of seeding-caused ice crystals.
		Model runs combined with results of SF tracer and ice nucleus counter measurements have indicated that the ground based seeding plume does under certain conditions reach desired cloud levels, but it also can be confined to shallow depths making the release point critical to transport to cloud regions with desired supercooled liquid water.
		Ice nucleus measurements indicated limited effectiveness for the generator and seeding agent being used.
	www.agu.org /revgeophys/czys01/node4.html (2416 words)

	nsflab
		The ice formation conditions of liquid sulfate aerosol particles were thus found to be rather similar and not distinguishable within measurement uncertainties (see Figure 2).
		The potentially higher ice nucleation efficiency of larger exhaust residues that result from ice contrail persistence and processing remains to be investigated.
		Aerosol particles are size selected with a differential mobility analyzer (DMA), measured for concentration by a condensation nucleus counter (CNC), measured for CCN activity with a thermal gradient diffusion chamber (TGDC) and thermodynamically preconditioned prior to ice nucleus measurement in a continuous flow diffusion chamber (CFDC).
	lamar.colostate.edu /~pdemott/nsflab.htm (4349 words)

	News in Science - Spotted! Ice on comet nucleus - 03/02/2006
		Ice has been detected on the nucleus, or solid body, of a comet for the first time, researchers report.
		The surface ice was detected by instruments on board the probe before it crashed into the comet in July last year.
		The scientists suspect the ice is in large grains, probably aggregates.
	www.abc.net.au /science/news/stories/s1561541.htm (399 words)

	SNOW HYDROLOGY (GEOG 4321): Snow Formation in the Atmosphere
		The symmetry of ice crystals was commented upon by the Chinese in the second century B.C. Europeans had recorded the same observation at least by the Middle Ages.
		Ice is a poor solvent (in constrast to liquid water).
		Snow and ice crystals thus have many of the impurities located on the outside of the particle rather than incorporated into the interior of the crystalline lattice structure.
	snobear.colorado.edu /Markw/SnowHydro/Atmosphere/atmos.html (2179 words)

	Ice Crystal Engineering - Home - weather modification, cloud seeding flares, hail suppression, rain enhancement, fog ...
		This means that the ICE pyrotechnic will begin to generate cloud ice at warmer temperatures.
		The difference in the speed of activation is minutes faster for the ICE aerosol, which for 63% activation requires on the order of 1 min, whereas the solution-based aerosols require ~6 to 8 min.
		In addition, the ICE pyrotechnic formulation affords a significantly faster means of initiating ice development.
	www.iceflares.com /weather-modification-cloud-seeding-ICE-GBFT.php (514 words)

	SELECTED REFERENCES - ATMOSPHERIC ICE NUCLEI INSTRUMENTS AND MEASUREMENTS (Site not responding. Last check: 2007-11-01)
		Gagin, A. and M. Aroyo, 1969: A thermal diffusion chamber for the measurement of ice nuclei concentrations.
		Mossop, S.C., 1972: The role of ice nucleus measurements in studies of ice particle formation in natural clouds.
		Vali, Gabor, D.C. Rogers and J.E. Dye, 1982: Aerosols, cloud nuclei and ice nuclei.
	www.eol.ucar.edu /homes/dcrogers/refer.htm (1026 words)

	Exploring Comets - Anatomy of a Comet (Site not responding. Last check: 2007-11-01)
		The nucleus, or body, of a comet has been described as a dusty snowball consisting of tiny pieces of rocky material embedded in a mass of ice and frozen gases.
		The coma is a cloud of gases that surrounds the nucleus of a comet.
		When comets come near the Sun, their tails become visible because heat from the Sun vaporizes some of the icy nucleus or head and sunlight reflects from the vapor.
	www.nasm.si.edu /ceps/etp/comets/comet_anatomy.html (269 words)

	Chemtrail Central :: View topic - Speakin' of Ice.....
		Heterogeneous freezing: a water droplet changes from liquid to ice by the action of a an ice nucleus.
		These ice nuclei are generally thought to be crystalline aerosols that have a structure similar to water ice.
		The requirement for an ice nucleus at temperatures between 0 and -40C explains the frequent occurrence of supercooled clouds that present problems like icing on airplanes.
	www.chemtrailcentral.com /forum/msg682.html (443 words)

	Deep Impact: Gallery: Images: Surface Ice Spectra (Site not responding. Last check: 2007-11-01)
		Modelling IR spectra of non-ice regions of the nucleus combined with water ice at various particle sizes.
		4b) and a calculated spectrum of 70 µm size water ice particles (purple) does not match at short wavelengths, while a mixture with 3 µm size water ice particles (orange) produces a poor match at long wavelengths.
		In her article "Exposed Water Ice Deposits on the Surface of Comet Tempel 1," Dr. Jessica Sunshine et al.
	deepimpact.jpl.nasa.gov /gallery/SurfaceIceSpectra.html (163 words)

	What Are Comets?
		he "typical" comet is a small, oblong chunk of ice, about 5-10 miles across, on the average; this chunk is called the comet's "nucleus." In addition to water ice, the nucleus may contain frozen carbon dioxide ("dry" ice), carbon monoxide, methane, and other volatiles.
		Interspersed with all this ice are tiny grains of dust; together, this ice and dust causes the nucleus to be a "dirty snowball," an idea first put forth by astronomer Fred Whipple in 1950, and firmly verified by the spacecraft Giotto's flyby of Halley's Comet in 1986.
		This can be due to a fresh eruption of new material from a comet's surface, or sometimes this occurs when the nucleus splits into two or more pieces, exposing previously hidden sections of its material to the sun's heat for the first time.
	www.sipe.com /halebopp/whatare2.htm (1036 words)

	Overview
		The focus of this research is to investigate physical and chemical influences on free tropospheric populations of aerosols involved in the formation of ice clouds, including heterogeneous ice nuclei (IN) and soluble aerosols which can freeze homogeneously in upper tropospheric conditions.
		This research extends specialized studies of the spectroscopy of ice forming nuclei to discern factors contributing to their sources, abundance and effectiveness.
		The physical and chemical characteristics of particles active as ice nuclei are compared with those of the ambient atmospheric aerosol to determine which characteristics are associated with the ability to form ice crystals at typical cirrus temperatures and supersaturations.
	lamar.colostate.edu /~pdemott/spl/SPL2overview.htm (534 words)

	[No title]
		During the Winter Icing and Storms Project 1994 (WISP-94), a two-month field program lasting until 25 March, about 25 researchers from NCAR's Research Applications Program, the National Oceanic and Atmospheric Administration (NOAA), and several universities are searching for the secrets that cause supercooled water droplets and ice crystals to form in clouds.
		Ironically, the worst icing conditions for aircraft can occur in a cloud deck that may not contain ice itself or produce any rain or snow at the ground, but that is full of supercooled water.
		Though icing conditions can be very localized, traditional icing forecasts for aviation are so general--often covering entire states--that they can be of little help in fine-tuning flight plans.
	www.rap.ucar.edu /projects/wisp/wisp_staffnotes (739 words)

	Adam Durant - Ice Nucleation
		Ice formation in atmospheric clouds is crucial to our understanding of precipitation and cloud radiative properties.
		Recent experiments were performed in the MTU Cloud Physics Lab to understand heterogeneous ice nucleation in supercooled liquid water drops.
		Durant, A. Shaw, G. Ernst, and W. Rose, Ice nucleation by volcanic ash: Influence of composition and morphology, paper presented at IAVCEI General Assembly, Pucon, Chile, 2004.
	www.geo.mtu.edu /~ajdurant/ice_nucleation_experiments/het_ice_nucleation.htm (383 words)

	Nucleus - Biocrawler (Site not responding. Last check: 2007-11-01)
		nucleus, a term in neuroanatomy used to describe a central nervous system structure composed mainly of gray matter that mediates electrical signaling within a particular subsystem
		Nucleus, a British jazz-rock band led by Ian Carr
		This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title.
	www.biocrawler.com /encyclopedia/Nuclei (285 words)

	Research and New Projects Under Development
		As techniques and instrumentation evolved, the impacts of cloud seeding began to be documented from the initiation of ice in clouds to the measurement of precipitation at the surface.
		The low ice nucleus counts indicate that the AgI seeding material did not pass across RRS (see Figure 3).
		This low level scan detected ice particles within a few hundred meters of the surface, and therefore also gives an indication of the areal coverage of precipitation that was being produced by the seeding.
	cloudseeding.dri.edu /Research/Research.html (1317 words)

Try your search on: Qwika (all wikis)