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Topic: Stoichiometric

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Timothy McVeigh

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	United States Patent Application: 0030207112
		A stoichiometric form of the material and the material whose stoichiometry is to be ascertained (the "unknown" material) are heated separately in a reactive atmosphere to 0.5 times the melting point of the material.
		Heat a stoichiometric form of the material and the material being evaluated for non-stoichiometry separately in a reactive atmosphere (e.g., oxygen, if oxygen non-stoichiometry is being ascertained) to 0.5 times the melting point of the material; monitor the weight change per unit sample weight.
		Alternatively, measure the properties of the material in the ideal stoichiometric form and compare this with the substance being evaluated for non-stoichiometry; if any property of the material, or the temperature coefficient of any property varies by more than 10% between the two substances, everything else remaining the same, the substance being evaluated is non-stoichiometric.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/PTO/search-adv.html&r=1&p=1&f=G&l=50&d=PG01&S1=20030207112.PGNR.&OS=dn/20030207112&RS=DN/20030207112 (16015 words)

	The Stoichiometric Fuel/Air Mixture (Site not responding. Last check: 2007-10-08)
		An "ideal" fuel/air mixture in which both the fuel and the oxygen in the air are completely consumed is called the "stoichiometric" mixture.
		The stoichiometric mixture is usually specified as the ratio of the mass of air to the mass of a particular fuel.
		Chevron give the stoichiometric ratio of air mass to fuel mass for gasoline as 14.7 : 1, but don't specify the composition of this hypothetical gasoline.
	home.earthlink.net /~graham1/MyToyotaPrius/SideBars/Stoichiometric.htm (152 words)

	unit02-sect02-les01-lessona (Site not responding. Last check: 2007-10-08)
		For ionic compounds, dissociation is said to be stoichiometric; that is, 100% of the dissolved units actually dissociate.
		Stoichiometric relationships are represented using a single arrow.
		In the case of hydrochloric acid, ionization is stoichiometric, virtually 100% of the molecules that dissolve in water ionize to become H
	www.cdli.ca /courses/chem3202/unit02/section01/lesson03/3-lesson-a.htm (1264 words)

	Stoichiometric Crystal Promises Laser Uses - May, 2003 (Site not responding. Last check: 2007-10-08)
		A team of researchers from Germany and Spain is investigating the properties of a stoichiometric crystal for use in face-cooled lasers, such as thin-disc and microchip designs.
		The stoichiometric crystal KYb(WO (top) is an ideal material for use in face-cooled microchip and thin-disc lasers.
		Because of the high active ion concentration in stoichiometric materials (equivalent to doping at 100 percent), the crystals display high pump absorption and high laser gain per unit length.
	www.photonics.com /spectra/tech/XQ/ASP/techid.1552/QX/read.htm (638 words)

	Stoichiometry of Chemical Reactions Tutorial for Chemistry 21A (Site not responding. Last check: 2007-10-08)
		The following is a scheme outlining the stoichiometric relation between the mass of one reactant and the mass of a second reactant or a product.
		In general, reactions are often carried out without the use of exact stoichiometric amounts of reactants for practical reasons.
		Stoichiometric calculations are based on the total consumption of the limiting reagent
	www2.hmc.edu /~karukstis/chem21a/tutorials/tutorialStoichi.html (712 words)

	Chemical Kinetics: Rate of Reaction (Site not responding. Last check: 2007-10-08)
		the stoichiometric coefficient for species B is twice that of species A; thus the concentration of B will decline twice as fast as that of species A. Similarly, the concentration of species C increases three times as fast as the concentration of A decreases.
		Determine the stoichiometric coefficients for a chemical reaction.
		As is evident from the above example, there is a relationship between the stoichiometric coefficient of a species in a reaction, the rate of change of the concentration of that species, and the rate of reaction.
	www.chm.davidson.edu /ChemistryApplets/kinetics/RateOfReaction.html (403 words)

	Formula calculation
		It is commonly useful to determine the stoichiometric formula of a mineral from its chemical analysis.
		As the measured analysis point does not in general fall on this surface, the problem is to find that point on the stoichiometric surface which is "nearest" (in a least squares sense) the measured analysis point.
		This nearest point on the stoichiometric surface yields the statistically most probable formula while the distance between the analysis point and the nearest stoichiometric point carries information regarding the probability that this analysis conforms to the specified stoichiometry.
	www.minsocam.org /msa/collectors_corner/arc/formula.htm (2196 words)

	Fuel Delivery within a High Performance Saturn Motor
		The term "stoichiometric" describes the mathematically "correct" combination of hydrocarbons and oxygen within a theoretical mixture for the internal combustion process.
		However, even though a stoichiometric ratio is theoretically the best combination of oxygen and hydrocarbons for a perfect combustion process, in practice, it is not always the best for a specific purpose.
		Stoichiometric ratios are preferred to richer ratios during closed-loop (partial throttle) operation, since it leads to better fuel economy and reduced emissions.
	www.teamscr.com /fuel.htm (3454 words)

	Multiple Reaction Stoichiometry
		It is important to distinguish between the ISE and the stoichiometric equations that represent reaction pathways.
		Then use the stoichiometric table to express the concentrations of each species in terms of the initial composition and the stoichiometric extents.
		Now use the stoichiometric table to express the mole terms in the rate expressions in terms of initial composition and the three stoichiometric extents.
	reactorlab.net /dir/stoichnotes.html (2090 words)

	RMP Lecture Notes
		is a stoichiometric equation for the combustion of methane -- it tells you the relative number of molecules or moles involved: "1 mole methane combines with 2 moles oxygen to make 1 mole carbon dioxide and 2 moles water".
		Valid stoichiometric equations are balanced -- the number of atoms of each species are the same on both sides (atoms cannot be created or destroyed!).
		The stoichiometric ratio of two components is the ratio of the stoichiometric coefficients in the balanced equation.
	www.cbu.edu /~rprice/lectures/reactive.html (758 words)

	Stoichiometric relationship between the quantities of substances in a chemical reaction.
		Stoichiometric relationship between the quantities of substances in a chemical reaction.
		Coursework and Essays: By Subject: Chemistry: Stoichiometric relationship between the quantities of substances in a chemical reaction
		Below is a short sample of the essay "Stoichiometric relationship between the quantities of substances in a chemical reaction.".
	www.coursework.info /i/63653.html (240 words)

	Stoichiometric Modeling of Complex Pharmaceutical Reactions
		Even after the application of the well known constraint of monotonically changing extents of reaction, the number of possible stoichiometries is quite large for a high dimensional problem such as the present one.
		The overall assumption of this stoichio-kinetic modeling approach is that the stoichiometric model can be found first and is independent of the kinetic model that follows.
		However, in the case where two reactions have substantial similarities in the stoichiometric coefficients and the kinetic forms of their reaction rates, the Modeling Separation Principle might not be possible.
	aiche.confex.com /aiche/2005/techprogram/P16498.HTM (645 words)

	Stoichiometry (Site not responding. Last check: 2007-10-08)
		The ratio of the stoichiometric coefficients from the equation is called a
		We have seen that a stoichiometric conversion problem involves a given amount of some substance and the calculation of the amount of a related substance, either a coreactant or a product.
		A balanced equation is necessary before you start in order to get the proper stoichiometric conversion factors from the coefficients.
	www.epcc.edu /ftp/Homes/victors/stoich.htm (927 words)

	Stoichiometric Math: CHM 1311 Lecture 18 June 1999
		Stoichiometric Math: CHM 1311 Lecture 18 June 1999
		Since C appears only once on each side, we can establish immediately the ratio of the molecules it appears in; we may later have to scale their coefficients when balancing other atoms but we'll never have to change this initial ratio.
		In this case, we'll need a stoichiometric coefficient of 4 for CO to balance the carbons.
	www.utdallas.edu /~parr/chm1311/13110618.html (1208 words)

	JCE 1999 (76) 52 [Jan] Amounts Tables as a Diagnostic Tool for Flawed Stoichiometric Reasoning
		As an illustration, second-semester general chemistry students were given a diagnostic test requiring them to construct an amounts table for a simple limiting-reagent problem.
		The test question had simple but not 1:1 stoichiometry, and the starting amounts were chosen so that the reactant present in larger amount was limiting.
		Fewer than half the students showed a good grasp of stoichiometric reasoning using amounts tables, despite having successfully completed first-semester general chemistry and having access to a text that presented amounts tables as a stoichiometric tool.
	jchemed.chem.wisc.edu /Journal/Issues/1999/Jan/abs52.html (267 words)

	Award#0077790 - Theoretical Frameworks for Ecological Dynamics Subject to Stoichiometric Constraints (Site not responding. Last check: 2007-10-08)
		They develop a relatively new theoretical framework for ecological dynamics that explicitly incorporates stoichiometric constraints.
		This base model involves a stoichiometric counterpart of the familiar Rosenzweig-MacArthur equations in which the effective carrying capacity of the resource species and the transfer efficiency of the consumer species are constrained by stoichiometric principles.
		Introduction of stoichiometric considerations in these equations (here, akin to "food quality") allows for a rich array of ecologically realistic dynamics, including deterministic extinction of the consumer species when resources are abundant but of poor quality.
	math.la.asu.edu /~kuang/DMS0077790.htm (466 words)

	Texas A&M University-Kingsville, Chem 1312, Exam Grade_____
		In a titration experiment, the initial pH = 8.22 and the pH at the stoichiometric point was 4.62.
		to the stoichiometric point would be greater than that for the HClO.
		to the stoichiometric point would be the same as that for the HClO.
	www.tamuk.edu /chemistry/kfjb000/1312Ex2Sp04.htm (822 words)

	The Convex Basis of the Left Null Space of the Stoichiometric Matrix Leads to the Definition of Metabolically ...
		Each two subspaces in the domain (i.e., the null space and row space) and codomain (i.e., the left null space and column space) form orthogonal pairs with one another.
		The stoichiometric matrix is thus shown as a reaction
		The role of stoichiometric analysis in studies of metabolism: an example.
	www.biophysj.org /cgi/content/full/85/1/16 (4333 words)

	Application of periodically poled stoichiometric LiTaO3 for efficient optical parametric chirped pulse amplification at ...
		Application of periodically poled stoichiometric LiTaO3 for efficient optical parametric chirped pulse amplification at 1 kHz
		We demonstrate optical parametric chirped pulse amplification (OPCPA) at 1-kHz repetition rate in periodically poled stoichiometric LiTaO3 (PPSLT) with 1 mol % MgO doping.
		Diode pumping was used both for the fiber laser generating the femtosecond seed pulses and the nanosecond laser/amplifier employed as a pump source.
	www.opticsexpress.org /abstract.cfm?URI=OPEX-12-26-6421 (679 words)

	SpiritPFC Fuel Purifier - FAQ's
		"Stoichiometric" or "Theoretical "Combustion" is the ideal combustion process during which any fuel is burned completely.
		Because diesel engines are governed, the mixture does not burn at stoichiometric ratios.
		At idle, with no load, it is not uncommon to have a diesel engine running at an air/fuel ratio of 60 or 100:1.
	www.spiritpfc.com /faq.htm (2021 words)

	Flux-balance analysis of mitochondrial energy metabolism: consequences of systemic stoichiometric constraints -- ... (Site not responding. Last check: 2007-10-08)
		TCA cycle because the oxygen input flux is in stoichiometric excess.
		The boundary region represents the stoichiometric ratio at which the carbon consumption and oxygen consumption are completely balanced.
		In region B, the total carbon flux is in stoichiometric excess.
	ajpregu.physiology.org /cgi/content/full/280/3/R695 (4498 words)

	Fuel cell membrane electrode assemblies with improved power outputs and poison resistance - Patent 6300000 (Site not responding. Last check: 2007-10-08)
		Hydrogen and air flow rates were set to 2 and 3.5 times the stoichiometric value theoretically needed to produce a given cell current output.
		Hydrogen and air flow rates were set to 1.2 and 3.5 times the stoichiometric value theoretically needed to produce a given cell current output respectively.
		The reactant flow was set to 2/3.5 times the stoichiometric value, for hydrogen and air respectively, and the stoichiometric flow was maintained throughout the polarization curve.
	www.freepatentsonline.com /6300000.html (18810 words)

	SparkNotes: Stoichiometric Calculations: Stoichiometric Calculations
		Now you're ready to use what you know about conversion factors to solve some stoichiometric problems in chemistry.
		Convert units of a given substance to moles.
		The gram formula mass can be used as a conversion factor in stoichiometric calculations through the following equation:
	www.sparknotes.com /chemistry/stoichiometry/stoichiometriccalculations/section2.rhtml (1407 words)

	Laser Focus World - Newsbreaks
		For example, ordinary congruently grown crystals have a high coercive electric field resulting from stoichiometric impurities, limiting aperture size for optical applications—a limit that does not apply to stoichiometric crystals.
		Congruently grown crystals are typically lithium-deficient, while stoichiometric materials maintain the nearly ideal one-to-one lithium-to-niobium ratio, reducing the defect density by two orders of magnitude.
		This high quality in turn leads to larger nonlinear and electro-optic coefficients, improved transparency in the ultraviolet, increased resistance to optical damage, and—most importantly for nonlinear and parametric processes—a factor of between 5 and 10 reduction in the poling fields required.
	lfw.pennnet.com /Articles/Article_Display.cfm?Article_ID=101365 (1679 words)

	News & Features: DNA-rule-driven fractals probe biochemical self assembly - computationally & in vitro
		In the preformed tile approach, each tile is prepared separately by mixing a stoichiometric amount of each component strand in the hybridization buffer and then annealing from 90 °C to room temperature over the course of several hours.
		The nucleating structure is similarly prepared by annealing the nucleating strand with input tile and capping strands.
		Growth may have been biased to form ‘011011' patterns by the depletion of VE-00 tiles, a stoichiometric disproportionation of tiles, due to growth of tubes early during annealing.
	www.iscid.org /boards/ubb-get_topic-f-1-t-000215.html (4500 words)

	Consequences of Stoichiometric Error on Nuclear DNA Content Evaluation in Coffea liberica var. dewevrei using DAPI and ...
		Consequences of Stoichiometric Error on Nuclear DNA Content Evaluation in Coffea liberica var.
		Stoichiometric error has been noted when estimating nuclear
		P, Louarn J, Duperray C, Hamon S. Nucleus–cytosol interactions—a source of stoichiometric error in flow cytometric estimation of nuclear DNA content in plants.
	aob.oxfordjournals.org /cgi/content/full/89/4/385 (2418 words)

	Impurity locations and mechanisms of charge compensation in stoichiometric lithium niobate and lithium tantalate ... (Site not responding. Last check: 2007-10-08)
		Impurity locations and mechanisms of charge compensation in stoichiometric lithium niobate and lithium tantalate crystals
		The tremendous narrowing of spectral lines found in stoichiometric crystals significantly increases the accuracy of obtainable data and, consequently, the reliability of derived models.
		Angular dependence of the EPR spectra of stoichiometric LiTaO3 crystal doped with iron (measured by R.Petersen) and a model of the Fe3+ center derived from the EPR/ENDOR data.
	www.physics.montana.edu /faculty/Malovichko/ac_NSF02.htm (249 words)

	Search Results for stoichiometric - Encyclopædia Britannica
		The rules followed in the determination of stoichiometric relationships are based on the...
		The transition metals and inner transition metals form a large variety of compounds with hydrogen, ranging from stoichiometric compounds to extremely complicated nonstoichiometric systems.
		Any of a number of freely diffusing organic compounds that function...
	www.britannica.com /search?query=stoichiometric&submit=Find&source=MWTAB (325 words)

	Periodically Poled Stoichiometric Lithium Tantalate for Nonlinear Optical Frequency Conversion (Site not responding. Last check: 2007-10-08)
		Periodically Poled Stoichiometric Lithium Tantalate for Nonlinear Optical Frequency Conversion
		Individuals in this category that will have access to any proprietary data shall have signed a non-disclosure statement that shall be maintained on file in the contracting office.
		To order call (800) DOD-SBIR, or use http://www.dtic.mil/dtic/sbir/service_req.html - Ref #2: Y. Furukawa, K. Kitamura, E. Suzuki, and K. Niwa, "Stoichiometric LiTaO3 single crystal growth by double crucible Czochralski method using automatic powder supply system," Journal of Crystal Growth, vol.
	www.dtic.mil /matris/sbir/sbir021/sbir19.html (321 words)

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