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Topic: Chemical yield

	Cotey Chemical Corp - Solving Water Well Production Production Problems Since 1949
		Commonly, the initial yield of a well may decrease because of movement of the well screen or casing, or because of incrustations of calcium carbonates and iron and manganese hydroxides/hydrated oxides and bacterial slimes, or because of simple silt and clay plugging.
		The use of complex chemical equations, technical terminology, and involved reactions is kept to a minimum although a certain familiarity is required for a competent knowledge on the part of representatives, service companies, and local advisory personnel.
		The chemical is simply poured in the well between the casing and pump column and the pump is used to agitate and dissolve the chemical in the water standing in the hole.
	www.coteychemical.com /whitepaper.html (6015 words)

	Yield (chemistry) - Wikipedia, the free encyclopedia
		Yield in chemistry, also known as chemical yield and reaction yield, is the amount of product obtained in a chemical reaction.
		The yield is usually also given as a relative yield, which is the actual yield divided by the theoretical yield (the ideal or mathematically calculated yield).
		The ideal or theoretical yield of a chemical reaction would be 100%, a value that is rarely reached.
	en.wikipedia.org /wiki/Yield_(chemistry) (436 words)

	Chemistry : Chapter 4 : Overview (Site not responding. Last check: 2007-10-20)
		Chemical formulas use the chemical symbol of the atom to express the type of atom and a subscript following the symbol to express the number of atoms in the molecule.
		Chemical equations list the formulas of starting materials, reactants, on the left (in no particular order) and use an arrow pointing to the list of formulas of the substances created, products, on the right.
		A balanced chemical equation describes both the ratio of molecules needed for a chemical reaction and the ratio of moles needed for a chemical reaction.
	www.wwnorton.com /chemistry/overview/ch4.htm (1537 words)

	Stem reserves support grain yield under stress
		The contribution of stem reserves to grain yield was greater in a tall than in a short barley cultivar, but absolute yield was the same in both, indicating that the taller cultivar lacked in current assimilation as compared with the shorter one (Daniels and Alcock, 1982).
		The demand by the grain yield sink is a primary factor in determining stem reserve mobilization.
		Nicolas and Turner (1993) confirmed the utility of chemical desiccation as means for revealing genetic variation in grain filling from stem reserves and proposed the use of a leaf spray of potassium iodide (0.4% w/v) in wheat as a milder treatment which mainly destroy chlorophyll.
	www.plantstress.com /methods/Stem_Reserves.htm (4321 words)

	Nutritive value of Crotalaria Ochroleuca: I chemical composition and in vitro dry matter digestibility at different ... (Site not responding. Last check: 2007-10-20)
		Chemical analysis for the DM organic matter (OM), crude protein (CP), crude fibre (CF), ether extract (EE), total ash, calcium and phosphorus contents of the forage samples were carried out according to A.O.A.C. The IVDMD was determined according to the procedure of Tilley and Terry (1963).
		Yields of leaf and stem with advancing plant growth are shown in Table 2.
		The chemical composition of the "marejea" plant, leaves and stem with advancing plant growth is shown in Tables 3, 4 and 5 respectively.
	www.fao.org /Wairdocs/ILRI/x5536E/x5536e0m.htm (1549 words)

	The Use of Distribution Fitting for Chemical Yield Analysis (via CobWeb/3.1 planetlab1.tamu.edu) (Site not responding. Last check: 2007-10-20)
		In practice, the actual yield may be less than the theoretical yield because of many reasons (incomplete reactions etc.), so the percentage yield measuring how successful a reaction has been is normally used.
		The goal is to calculate the probability of a batch having yield greater than 70%, based on a data set of 200 observed values of the percentage yield.
		Since random variations of percentage yield X are the resultant of some independent random sources in the chemical manufacturing process, we will use the Normal distribution as the probabilistic model.
	www.mathwave.com.cob-web.org:8888 /applications/chemical_yield.html (571 words)

	Theoretical & Actual Yields
		The theoretical yield of a reaction is determined from the balanced equation.
		Chemical reaction equations cannot express masses directly because chemicals interact part to part and masses are not parts.
		The percent yield for a chemical reaction is calculated identically to percent yield of farm produce or a savings bond.
	www.zianet.com /drbill/chem/theo.htm (1275 words)

	Compliance With DOE 5480.11: The Urine Bioassay Program at Y-12 - CANBERRA, An AREVA Group Company
		To determine the chemical yield, a known activity of tracer is spiked into the sample prior to the separation chemistry.
		Since it is an isotope of the same element it will behave chemically in the same manner, so that you can assume the percent of tracer lost is equal to the percent of sample lost.
		Assuming a chemical yield, rather than introducing a tracer is a meaningless exercise since every sample behaves differently - no adequate prediction can be made.
	www.canberra.com /literature/1011.asp (1617 words)

	Rice's chemical 'scissors' yield short carbon nanotubes
		The new process yields nanotubes that are suitable for a variety of applications, including biomedical sensors small enough to migrate through cells without triggering immune reactions.
		The chemical cutting process involves fluorinating the nanotubes, essentially attaching thousands of fluorine atoms to their sides, and then heating the fluoronanotubes to about 1,000 Celsius in an argon atmosphere.
		The highly-reactive fluorine atoms, which are attached to the walls of the nanotubes, allow scientists to create subsequent chemical reactions, attaching other substances to the nanotube walls.
	www.eurekalert.org /pub_releases/2003-07/ru-rc072203.php (544 words)

	ScienceDaily: Rice University's Chemical 'Scissors' Yield Short Carbon Nanotubes; New Process Yields Nanotubes Small ...
		Rice Research Yields "Designer" Carbon Nanotubesl Addition Of Fluorine Opens Door To Hundreds Of Nanotube Derivatives (April 12, 2002) -- Researchers at Rice University say fluorine -- the most reactive element in nature -- could prove to be a key in unlocking the potential of carbon nanotubes and other carbon nanostructures.
		Carbon -- Carbon is a chemical element in the periodic table that has the symbol C and atomic number 6.
		Chemical compound -- A chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition.
	www.sciencedaily.com /releases/2003/07/030723083644.htm (1806 words)

	Effect of stage of harvest on DM yield, nutrient content, in vitro and in situ parameters and their relationship of ...
		The chemical and the enzymatic cellulase analysis were done at the Institute of Animal Sciences of the Humboldt-University of Berlin, Germany.
		Chemical analysis consisted of proximate and detergent analysis (Naumann and Bassler 1997; Goering and van Soest 1970).
		The potential degradable forage yield of the pastures harvested at the different lengths of growing period did not vary significantly, despite the trend of increased PD forage yields of the native pasture as harvesting periods got longer during the experimental period (Figure 2).
	www.cipav.org.co /lrrd/lrrd17/1/enoh17004.htm (3601 words)

	The Establishment Of A Sustainable Agricultural System In Taiwan (Site not responding. Last check: 2007-10-20)
		The results, shown in Table 2, indicated that the fresh ear yield of sweet corn harvested from the organic plots was equivalent to that of corn given chemical fertilizer, except for the plot with cattle manure which gave a lower corn yield.
		The nitrogen and magnesium content of the corn grain were significantly higher in corn from the plot with chemical fertilizer, while the phosphorus and potassium content was slightly higher in the organic plots than in the chemical one.
		The yield of each crop varied in different types of cropping system, but the net profit per year was 3.7-60% higher than the traditional rice-rice cropping pattern (Table 5).
	www.agnet.org /library/article/eb353.html (4679 words)

	Bioline International Official Site (site up-dated regularly)
		The higher maize grain yield reductions in the broadcast than in the row planted mixtures of maize + lablab obtained was attributed to yield advantages for the row planted mixtures that accrued basically through a lower inter- and intra-crop competition for space, both aerial and edaphic (Kassam, 1979).
		Less reductions in wheat grain yield from the intercrops than in the maize or sorghum + lablab intercrops indicated that the competition for light and nutrients between clover and wheat in the mixtures was probably minimal and, therefore, did not affect grain yield as much as in ML and SL intercrops.
		The high crude protein yield of the fodder for the mixtures when compared to the yield from sole stands was attributed to the higher CP concentration of the mixtures than in the forages from sole cereal stands.
	www.bioline.org.br /request?cs02008 (4334 words)

	[No title]
		The combined DM yield and chemical composition after 3 cuttings were different among cuttings, planting with ridges and manure application, although there were no significant interactions.
		The DM yield and crude protein content were relatively high (3.6 to 4.4 tonnes/ha and 20.6 to 22.0%, respectively).
		The yields decreased slightly in the second harvest, but increased markedly at the third cutting, particularly in the plots with manure fertilization.
	www.mekarn.org /procKK/poun.htm (964 words)

	Treatment of cellulose material with additives while producing cellulose pulp - Patent 6241851
		Conventional mechanisms for increasing the yield of chemical pulping process are directed toward limiting the amount of cellulose lost through alkaline peeling by promoting the stabilization of the end groups against this peeling reaction, that is, they promote the formation of a carboxylic end group.
		One hindrance to the understanding of the effect of chemical additive concentration on the effectiveness of the treatment is the conventional nomenclature used to describe the amount of liquid present in a cooking process.
		This combination of extracted liquid, fresh cooking chemical, and additive is recirculated via conduit 148 and re-introduced to digester 111 in the vicinity of screen 138 by a conventional conduit, known as the "central pipe assembly", 163.
	www.freepatentsonline.com /6241851.html (13679 words)

	Applications of novel closed loop aqueous separation process in chemical processing
		In the zero-discharge approach for the chemical processing industry, conventional water purification systems are used only for the makeup water.
		These chemicals may be recycled to the process where they originate, or they may be disposed of in a compact, non-hazardous form, or may be sold as final products.
		based chemical processing plants are environmentally friendly, because they avoid the use of toxic organic solvents which pollute water resources and the air.
	www.bluspr.com /chemical_applications.html (937 words)

	Percent Yield for Chemical Equations
		If you burn 12 grams of carbon to make CO, then amount of carbon dioxide expected is one mol of CO or 44 grams of CO Sadly the amount you will get will probably be less than 44 grams and more like 34 grams of CO The problem is a competing reaction that happens.
		The predicted yield is determined by the masses used in a reaction and the mole ratios in the balanced equation.
		What is the percent yield for a reaction if you predicted the formation of 21.
	www.800mainstreet.com /6/0006-007-percent-yield.html (414 words)

	IngentaConnect Yield, persistency and chemical composition of Lotus species and ... (Site not responding. Last check: 2007-10-20)
		Yield, persistency and chemical composition of Lotus species and varieties (birdsfoot trefoil and greater birdsfoot trefoil) when harvested for silage in the UK
		The yield and chemical composition of thirteen Lotus corniculatus varieties and one Lotus uliginosus variety, when grown and ensiled in the UK, were investigated.
		At cuts 1 and 2 of the first harvest year, 1 kg of each variety was ensiled and sub-sampled for chemical analysis.
	www.ingentaconnect.com /content/bsc/gfs/2006/00000061/00000002/art00004 (331 words)

	Potential of water hyacinth (Eicchornia crassipes) in ruminant nutrition in Tanzania
		Biomass yield (ton/ha/year) of water hyacinth was estimated as 322.2 tons (approx.
		Table 3 and 4 show the chemical composition of pre and post ensiled water hyacinth and the effects of addition of molasses on the quality of silage from water hyacinth.
		Chemical composition and in vitro degradability of whole plants and shoots of the water hyacinth (Eicchornia crassipes) by rumen micro-organisms.
	www.cipav.org.co /lrrd/lrrd17/8/abou17096.htm (3132 words)

	Evaluation of Herbaceous Biomass Crops in the Northern Great Plains
		Biomass yield and chemical composition of seeded kochia harvested at four maturity dates at Prosper, ND in 1990
		Biomass yield of bromegrass as affected by N level and harvest date at Fargo, ND in 1990-92.
		Chemical composition of eight perennial biomass species/mixtures at Prosper, ND, (meaned across years and N levels).
	bioenergy.ornl.gov /reports/meyers/meyertoc.html (615 words)

	Vegetables yield anticancer chemical (Site not responding. Last check: 2007-10-20)
		Plant chemicals created during the preparation of some vegetables could kill colon cancer cells in a similar way to some cancer drugs.
		Scientists at the Institute of Food Research (IFR) have found that natural chemicals sabotage the uncontrolled cell division of colon cancer cells.
		Cancer cells are immortal because they divide indefinitely, unlike healthy cells which commit suicide at the end of their lifecycle as part of a constant process of renewal.
	www.news-medical.net /?id=1380 (639 words)

	Shrink Film features natural UV blocking capability., Eastman Chemical Co.
		Embrace High Yield shrink film is an extension of the company's Embrace shrink film that was launched in 1999.
		Embrace High Yield is manufactured by combining Embrace shrink film with 15 percent to 30 percent Embrace High Yield 1000 compound.
		Embrace High Yield maintains the same superior attributes and benefits for Embrace shrink film including high ultimate shrinkage for adhering to contoured or unique containers and maintaining the shrink curve at onset temperature.
	news.thomasnet.com /fullstory/478023/1303 (775 words)

	Alternate to standard tensile for determining young's modulus & yield
		We have been experimenting with different means of measuring the mechanical properties of the tube and have recent heard about the use of nano-indentation testing.
		Many new and important areas of research and technology are being led by disciplines other than mechanical and civil engineering, which have historically been closely related to experimental mechanics.
		Electrical engineers have led the development of MEMS, and chemical engineers and biologists are leading mechanical studies at the cellular level.
	www.physicsforums.com /showthread.php?t=66734 (836 words)

	Ceramic-tube Heat Exchanger Reduces Energy Use and Increases Yield of Chemical Products (Site not responding. Last check: 2007-10-20)
		Each year, the U.S. chemical industry produces approximately 8 billion pounds of methanol, a chemical used primarily as a solvent or in the production of formaldehyde.
		Methanol is produced via a series of process steps, including "steam/methane reforming." The actual output of the steam/methane reforming process is an intermediate product known as synthesis gas, which is prepared by catalytically reacting a mixture of natural gas (methane) and steam at high temperature in a reformer.
		Methanol, ammonia, and hydrogen are all commodity-type chemicals, and their selling prices are generally not much more than the production costs.
	es.epa.gov /techinfo/facts/ceramic.html (970 words)

	Chevron Phillips Chemical Company LLC
		As a result, Chevron Phillips Chemical’s proprietary technology is licensed in 18 countries, with over 85 commercial reactors in operation, making Chevron Phillips Chemical’s loop slurry technology the premier choice around the globe for polyethylene polymerization.
		In the past ten years, the Company’s scientists and engineers have implemented more than 100 separate improvements which have led to increased space-time yield, improved economy-of-scale due to major increases in the maximum reactor size, and significant decreases in the amount of energy and utilities consumed per pound of polymer produced.
		Manufacturers utilize this technology in approximately 60 percent of the U.S. household/industrial chemical blow molding market, 85 percent of the U.S. liquid-food blow molding market, 80 percent of the polyethylene pipe market in the U.S., and one-half of all sales of geomembrane polyethylene resin in North America.
	www.cpchem.com /enu/top_stories_8038.asp (666 words)

	Atmospheric Chemistry of Secondary Organic Aerosol Formation, Exposure Research, US EPA
		The overall objective of this research is to determine the key chemical and physical processes that control the yield and chemical composition of the secondary organic aerosol (SOA) component of particulate matter (PM) from atmospheric transformations of aromatic compounds, biogenic hydrocarbons, and atmospherically relevant mixtures including synthetic automobile exhaust.
		The SOA yield is the amount of organic aerosol produced per unit hydrocarbon reacted-a critical parameter needed to develop cost-effective control strategies for SOA formation.
		The smog chamber was used to irradiate selected hydrocarbons in the presence of nitrogen oxides to assess the impact of environmental parameters such as relative humidity on the yield and chemical composition of SOA.
	www.epa.gov /nerl/research/2000/html/g1-10.html (472 words)

	[No title]
		# (Note: I didn't have to put header=FALSE since that is the default.) chemical <- read.table("http://mason.gmu.edu/~csutton/MandP220.dat", header=FALSE) chemical # # It can be noted that the columns/variables do not have nice names # (the V1, V2, and V3 names are due to R).
		names(chemical) <- c("yield", "time", "temp") chemical # # As it is now, to use the variable yield, one would have to type # chemical$yield --- but if we use the attach function this can be # avoided.
		attach(chemical) yield # # # Task 2 # (compare full 2nd-order model to 1st-order model) # # First I will fit a 1st-order model and look at the residuals.
	mason.gmu.edu /~csutton/chemicalR789cr.txt (1289 words)

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