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1

ISOTOPE METHODS IN HOMOGENEOUS CATALYSIS.  

SciTech Connect (OSTI)

The use of isotope labels has had a fundamentally important role in the determination of mechanisms of homogeneously catalyzed reactions. Mechanistic data is valuable since it can assist in the design and rational improvement of homogeneous catalysts. There are several ways to use isotopes in mechanistic chemistry. Isotopes can be introduced into controlled experiments and followed where they go or don't go; in this way, Libby, Calvin, Taube and others used isotopes to elucidate mechanistic pathways for very different, yet important chemistries. Another important isotope method is the study of kinetic isotope effects (KIEs) and equilibrium isotope effect (EIEs). Here the mere observation of where a label winds up is no longer enough - what matters is how much slower (or faster) a labeled molecule reacts than the unlabeled material. The most careti studies essentially involve the measurement of isotope fractionation between a reference ground state and the transition state. Thus kinetic isotope effects provide unique data unavailable from other methods, since information about the transition state of a reaction is obtained. Because getting an experimental glimpse of transition states is really tantamount to understanding catalysis, kinetic isotope effects are very powerful.

BULLOCK,R.M.; BENDER,B.R.

2000-12-01T23:59:59.000Z

2

Converting Homogeneous to Heterogeneous in Electrophilic Catalysis using Monodisperse Metal Nanoparticles  

SciTech Connect (OSTI)

A continuing goal in catalysis is the transformation of processes from homogeneous to heterogeneous. To this end, nanoparticles represent a new frontier in heterogeneous catalysis, where this conversion is supplemented by the ability to obtain new or divergent reactivity and selectivity. We report a novel method for applying heterogeneous catalysts to known homogeneous catalytic reactions through the design and synthesis of electrophilic platinum nanoparticles. These nanoparticles are selectively oxidized by the hypervalent iodine species PhICl{sub 2}, and catalyze a range of {pi}-bond activation reactions previously only homogeneously catalyzed. Multiple experimental methods are utilized to unambiguously verify the heterogeneity of the catalytic process. The discovery of treatments for nanoparticles that induce the desired homogeneous catalytic activity should lead to the further development of reactions previously inaccessible in heterogeneous catalysis. Furthermore, our size and capping agent study revealed that Pt PAMAM dendrimer-capped nanoparticles demonstrate superior activity and recyclability compared to larger, polymer-capped analogues.

Witham, Cole A.; Huang, Wenyu; Tsung, Chia-Kuang; Kuhn, John N.; Somorjai, Gabor A.; Toste, F. Dean

2009-10-15T23:59:59.000Z

3

asymmetric catalysis stereoelectronic: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

X Lewis Acid Catalysis Brnsted Acid Catalysis X Johnson, Jeff S. 2 Multidimensional free energy relationships in asymmetric catalysis. Open Access Theses and Dissertations...

4

ISHHC XIII International Symposium on the Relations betweenHomogeneous and Heterogeneous Catalysis  

SciTech Connect (OSTI)

The International Symposium on Relations between Homogeneous and Heterogeneous Catalysis (ISHHC) has a long and distinguished history. Since 1974, in Brussels, this event has been held in Lyon, France (1977), Groeningen, The Netherlands (1981); Asilomar, California (1983); Novosibirsk, Russia (1986); Pisa, Italy (1989); Tokyo, Japan (1992); Balatonfuered, Hungary (1995); Southampton, United Kingdom (1999); Lyon, France (2001); Evanston, Illinois (2001) and Florence, Italy (2005). The aim of this international conference in Berkeley is to bring together practitioners in the three fields of catalysis, heterogeneous, homogeneous and enzyme, which utilize mostly nanosize particles. Recent advances in instrumentation, synthesis and reaction studies permit the nanoscale characterization of the catalyst systems, often for the same reaction, under similar experimental conditions. It is hoped that this circumstance will permit the development of correlations of these three different fields of catalysis on the molecular level. To further this goal we aim to uncover and focus on common concepts that emerge from nanoscale studies of structures and dynamics of the three types of catalysts. Another area of focus that will be addressed is the impact on and correlation of nanosciences with catalysis. There is information on the electronic and atomic structures of nanoparticles and their dynamics that should have importance in catalyst design and catalytic activity and selectivity.

Somorjai (Ed.), G.A.

2007-06-11T23:59:59.000Z

5

aqueous phase catalysis: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 292 Magnetic catalysis in hot...

6

The 13th International Symposium on Relations between Homogeneous and Heterogeneous Catalysis -- AnIntroduction  

SciTech Connect (OSTI)

Over forty years, there have been major efforts to aim at understanding the properties of surfaces, structure, composition, dynamics on the molecular level and at developing the surface science of heterogeneous and homogeneous catalysis. Since most catalysts (heterogeneous, enzyme and homogeneous) are nanoparticles, colloid synthesis methods were developed to produce monodispersed metal nanoparticles in the 1-10 nm range and controlled shapes to use them as new model catalyst systems in two-dimensional thin film form or deposited in mezoporous three-dimensional oxides. Studies of reaction selectivity in multipath reactions (hydrogenation of benzene, cyclohexene and crotonaldehyde) showed that reaction selectivity depends on both nanoparticle size and shape. The oxide-metal nanoparticle interface was found to be an important catalytic site because of the hot electron flow induced by exothermic reactions like carbon monoxide oxidation.

Somorjai, Gabor A.

2008-02-06T23:59:59.000Z

7

Journal of Molecular Catalysis A: Chemical 251 (2006) 823 Design and study of homogeneous catalysts for the selective,  

E-Print Network [OSTI]

material for materials and energy. Its abundance has garnered much interest in the scientific communityJournal of Molecular Catalysis A: Chemical 251 (2006) 8­23 Design and study of homogeneous the landscape of the current materials and energy industries. Natural gas continues to represent a vast source

Goddard III, William A.

8

Mechanistic Studies at the Interface Between Organometallic Chemistry and Homogeneous Catalysis  

SciTech Connect (OSTI)

Mechanistic Studies at the Interface Between Organometallic Chemistry and Homogeneous Catalysis Charles P. Casey, Principal Investigator Department of Chemistry, University of Wisconsin - Madison, Madison, Wisconsin 53706 Phone 608-262-0584 FAX: 608-262-7144 Email: casey@chem.wisc.edu http://www.chem.wisc.edu/main/people/faculty/casey.html Executive Summary. Our goal was to learn the intimate mechanistic details of reactions involved in homogeneous catalysis and to use the insight we gain to develop new and improved catalysts. Our work centered on the hydrogenation of polar functional groups such as aldehydes and ketones and on hydroformylation. Specifically, we concentrated on catalysts capable of simultaneously transferring hydride from a metal center and a proton from an acidic oxygen or nitrogen center to an aldehyde or ketone. An economical iron based catalyst was developed and patented. Better understanding of fundamental organometallic reactions and catalytic processes enabled design of energy and material efficient chemical processes. Our work contributed to the development of catalysts for the selective and mild hydrogenation of ketones and aldehydes; this will provide a modern green alternative to reductions by LiAlH4 and NaBH4, which require extensive work-up procedures and produce waste streams. (C5R4OH)Ru(CO)2H Hydrogenation Catalysts. Youval Shvo described a remarkable catalytic system in which the key intermediate (C5R4OH)Ru(CO)2H (1) has an electronically coupled acidic OH unit and a hydridic RuH unit. Our efforts centered on understanding and improving upon this important catalyst for reduction of aldehydes and ketones. Our mechanistic studies established that the reduction of aldehydes by 1 to produce alcohols and a diruthenium bridging hydride species occurs much more rapidly than regeneration of the ruthenium hydride from the diruthenium bridging hydride species. Our mechanistic studies require simultaneous transfer of hydride from ruthenium to the aldehyde carbon and of a proton from the CpOH unit to the aldehyde oxygen and support reduction of the aldehyde without its prior coordination to ruthenium. Another important step in the catalysis is the regeneration of 1 from reaction of H2 with the stable diruthenium bridging hydride complex 2. Studies of the microscopic reverse of this process (hydrogen evolution from 1 which occurs at 80 �������°C) in the presence of alcohol (the product of aldehyde hydrogenation) have shown that a dihydrogen complex is formed reversibly at a rate much faster than hydrogen evolution. Kinetic and theoretical studies in collaboration with Professor Qiang Cui of Wisconsin indicated an important role for alcohol in mediating transfer of hydrogen to ruthenium. One key to developing more active catalysts was to destabilize the bridging hydride intermediate 2 to prevent its formation or to speed its conversion to a reactive monohydride 1 by reaction with H2. We found several successful ways to destabilize the bridging hydride and to obtain more active catalysts. Most recently, we discovered related iron catalysts for hydrogenation that do not form dimers; the cost advantage of iron catalysts is spectacular. Iron Catalysts. In an exciting development, we found that a related iron complex is also a very active ketone hydrogenation catalyst. This hydrogenation catalyst shows high chemoselectivity for aldehydes, ketones, and imines and isolated C=C, C���¯�������ºC, C-X, -NO2, epoxides, and ester functions are unaffected by the hydrogenation conditions. Mechanistic studies have established a reversible hydrogen transfer step followed by rapid dihydrogen activation. The same iron complex also catalyzes transfer hydrogenation of ketones.

Charles P. Casey

2012-11-14T23:59:59.000Z

9

asymmetric catalysis solvent-free: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

X Lewis Acid Catalysis Brnsted Acid Catalysis X Johnson, Jeff S. 2 Multidimensional free energy relationships in asymmetric catalysis. Open Access Theses and Dissertations...

10

acid-base catalysis ii: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 232 Magnetic catalysis in hot...

11

catalysis | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

catalysis catalysis Leads No leads are available at this time. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a candidate material for...

12

DOE Laboratory Catalysis Research Symposium - Abstracts  

SciTech Connect (OSTI)

The conference consisted of two sessions with the following subtopics: (1) Heterogeneous Session: Novel Catalytic Materials; Photocatalysis; Novel Processing Conditions; Metals and Sulfides; Nuclear Magnetic Resonance; Metal Oxides and Partial Oxidation; Electrocatalysis; and Automotive Catalysis. (2) Homogeneous Catalysis: H-Transfer and Alkane Functionalization; Biocatalysis; Oxidation and Photocatalysis; and Novel Medical, Methods, and Catalyzed Reactions.

Dunham, T.

1999-02-01T23:59:59.000Z

13

EMSL - catalysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

catalysis en Duets by molecules and plasmons http:www.emsl.pnl.govemslwebnewsduets-molecules-and-plasmons

14

INSTITUTE FOR INTEGRATED CATALYSIS Catalysis Research for  

E-Print Network [OSTI]

. This work includes catalysis for upgrading biomass feedstocks; for chemical energy storage, retrieval

15

2012 Catalysis Lectures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bert Weckhuysen, who holds the chair of Inorganic Chemistry and Catalysis at Utrecht University, will give a series of catalysis lectures during his sabbatical period at...

16

Seventh BES (Basic Energy Sciences) catalysis and surface chemistry research conference  

SciTech Connect (OSTI)

Research programs on catalysis and surface chemistry are presented. A total of fifty-seven topics are included. Areas of research include heterogeneous catalysis; catalysis in hydrogenation, desulfurization, gasification, and redox reactions; studies of surface properties and surface active sites; catalyst supports; chemical activation, deactivation; selectivity, chemical preparation; molecular structure studies; sorption and dissociation. Individual projects are processed separately for the data bases. (CBS)

Not Available

1990-03-01T23:59:59.000Z

17

Zeolite catalysis  

SciTech Connect (OSTI)

This patent describes a process for preparing hydrocarbons boiling in the gasoline and/or distillate range by contacting a feedstock comprising lower molecular weight olefins in a reaction zone under conditions of elevated temperature and pressure with a shape selective crystalline aluminosilicate catalyst, comprising: reducing the non-shape selective surface-cracking and/or surface isomerization activity of the aluminosilicate catalyst by a process comprising: preparing an aqueous solution comprising colloidal silica, optionally an organic directing agent, and a source of hydroxide ions; mixing the aqueous solution with an aqueous dispersion of shape-selective crystalline aluminosilicate to form a homogeneous mixture which is subsequently heated; adding an aqueous solution comprising a source of fluoride ions to the homogeneous mixture to form a reactive composition; heating the reactive composition at a temperature to effectively form a surface-deactivated catalyst comprising a crystalline fluoride-containing silica outer shell on an aluminosilicate; withdrawing the surface-deactivated catalyst from the reactive composition for washing, drying, and calcining of the catalyst; and removing the catalyst to the reaction zone for contact with the olefin feedstock.

Chu, P.; Garwood, W.E.; Schwartz, A.B.

1988-11-29T23:59:59.000Z

18

HETEROGENEOUS CATALYSIS RESEARCH MEETING  

E-Print Network [OSTI]

Williams) Transition~Metal Carbides Heterogeneous CatalysisActivity of Transition-Metal Carbides Wendell S. Williamsand testing of transition-metal carbide electrodes for

Authors, Various

2011-01-01T23:59:59.000Z

19

EMSL - In situ catalysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

situ-catalysis en Local environment and composition of magnesium gallium layered double hydroxides determined from solid-state 1H and 71Ga NMR http:www.emsl.pnl.govemslweb...

20

Neutrons for Catalysis: A Workshop on Neutron Scattering Techniques for Studies in Catalysis  

SciTech Connect (OSTI)

This report summarizes the Workshop on Neutron Scattering Techniques for Studies in Catalysis, held at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL) on September 16 and 17, 2010. The goal of the Workshop was to bring experts in heterogeneous catalysis and biocatalysis together with neutron scattering experimenters to identify ways to attack new problems, especially Grand Challenge problems in catalysis, using neutron scattering. The Workshop locale was motivated by the neutron capabilities at ORNL, including the High Flux Isotope Reactor (HFIR) and the new and developing instrumentation at the SNS. Approximately 90 researchers met for 1 1/2 days with oral presentations and breakout sessions. Oral presentations were divided into five topical sessions aimed at a discussion of Grand Challenge problems in catalysis, dynamics studies, structure characterization, biocatalysis, and computational methods. Eleven internationally known invited experts spoke in these sessions. The Workshop was intended both to educate catalyst experts about the methods and possibilities of neutron methods and to educate the neutron community about the methods and scientific challenges in catalysis. Above all, it was intended to inspire new research ideas among the attendees. All attendees were asked to participate in one or more of three breakout sessions to share ideas and propose new experiments that could be performed using the ORNL neutron facilities. The Workshop was expected to lead to proposals for beam time at either the HFIR or the SNS; therefore, it was expected that each breakout session would identify a few experiments or proof-of-principle experiments and a leader who would pursue a proposal after the Workshop. Also, a refereed review article will be submitted to a prominent journal to present research and ideas illustrating the benefits and possibilities of neutron methods for catalysis research.

Overbury, Steven {Steve} H [ORNL; Coates, Leighton [ORNL; Herwig, Kenneth W [ORNL; Kidder, Michelle [ORNL

2011-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Fundamental studies of reactive intermediates in homogeneous catalysis  

SciTech Connect (OSTI)

The studies involve dissociation of Fe(CO){sub n}{sup {minus}}, Ni(CO){sub n}{sub {minus}}, and other carbonyl anions; decarboxylation of (CO){sub 4}FeCOOH{sup {minus}} to form CO{sub 2} and (CO){sub 4}FeH{sup {minus}} in the water gas shift reaction; gas-phase bimolecular reactions of carbonyl anions and O{sub 2}; reaction of O{sub 2} with CpMn(CO){sub 2}{sup {minus}}; gas-phase chemistry of fullerene anions; and gas-phase thermochemistry of bicarbonate ion, bisulfite ion, and their conjugate acids (sulfonate ion was produced).

Not Available

1993-10-01T23:59:59.000Z

22

Homogeneous Catalysis Selective Oxidation of Methane to Methanol  

E-Print Network [OSTI]

oxidizing agent than SVI ions (Eo = 1.5 V SeO4 2À /H2SeO3, Eo = 0.17 V SO4 2À /H2SO3, respec- tively) and, critically, the hydrated form, selenic acid (H2SeO4), is known to oxidize gold metal.[7] Equally impor- tant

Goddard III, William A.

23

Phase selectively soluble polymer supports to facilitate homogeneous catalysis  

E-Print Network [OSTI]

Soluble polymers that have phase selective solubility are useful in synthesis because they simplify purification and separation. Such selectively soluble polymers simplify catalyst, reagent, and product recovery and enable the use of Green chemistry...

Ortiz-Acosta, Denisse

2009-05-15T23:59:59.000Z

24

Homogeneous and Interfacial Catalysis in 3D Controlled Environment | The  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFun withconfinement plasmas inPortal StartupdefaultThe benefits ofEnergyAmes

25

Polyisobutylene as a Polymer Support for Homogeneous Catalysis  

E-Print Network [OSTI]

of 5 cycles In 2005, Zhang described immobilization of Cinchona alkaloids with an anthraquinone core onto PEG 5000 (eq. 9). 21 This PEG-bound alkaloid 6was used in asymmetric dihydroxylation with various alkenes with high stereoselectivities...

Hongfa, Chayanant

2010-01-14T23:59:59.000Z

26

Catalysis Research for Energy Independence  

E-Print Network [OSTI]

production and use, and catalysis lies at the core of efficiently and effectively using our current energy, converting carbon dioxide into fuels, and transforming electrical energy from renewable energy sourcesCatalysis Research for Energy Independence Chemical transformations are at the heart of energy

27

Feasibility study of a 6V-92TA homogeneous auto-ignited two-stroke (HAT) compressed-natural-gas-engine. Topical report, August 1989-May 1990  

SciTech Connect (OSTI)

The objective of the project was to modify a two-stroke 6V-92TA diesel engine to operate on natural gas using a simple system with gas addition to the compressor inlet and a spark plug for cold start and non-autoignition engine operation. The engine was to be operated at most speed-load conditions by autoignition of the premixed gas-air mixture. This concept is referred to as the Homogeneous Auto-Ignited Two-Stroke (HAT). Autoignition of carbureted natural gas was achieved at various loads and speeds in a 6V-92TA engine modified for operating on natural gas with the HAT concept. However, HAT engine operation up to 277 hp at 2100 rpm (diesel coach rating) was not achieved because early ignition in some cylinders caused knock and excessive heat transfer. Instead, the engine was operated up to 226 hp (767 N.m) at 2100 rpm, 181 hp (780 N.m) at 1650 rpm, 130 hp (773 N.m) at 1200 rpm, and 34 hp (368 N.m) at 650 rpm. Maximum brake thermal efficiency measured was 33.4% at 2100 rpm/219 hp. The corrected efficiency (to compensate for the unburned natural gas lost during the scavenging process) was higher than this. Steady-state emissions show very low NOx, total unburned HC lower than expected and reasonable CO levels. The lean air-fuel mixture and unburned exhaust gases in the cylinder resulted in very low NOx emissions.

Kakwani, R.M.; Winsor, R.E.

1990-08-01T23:59:59.000Z

28

Magnetic catalysis and inverse magnetic catalysis in QCD  

E-Print Network [OSTI]

We investigate the effects of strong magnetic fields on the QCD phase structure at vanishing density by solving the gluon and quark gap equations, and by studying the dynamics of the quark scattering with the four-fermi coupling. The chiral crossover temperature as well as the chiral condensate are computed. For asymptotically large magnetic fields we find magnetic catalysis, while we find inverse magnetic catalysis for intermediate magnetic fields. Moreover, for large magnetic fields the chiral phase transition for massless quarks turns into a crossover. The underlying mechanisms are then investigated analytically within a few simplifications of the full numerical analysis. We find that a combination of gluon screening effects and the weakening of the strong coupling is responsible for the phenomenon of inverse catalysis. In turn, the magnetic catalysis at large magnetic field is already indicated by simple arguments based on dimensionality.

Niklas Mueller; Jan M. Pawlowski

2015-02-27T23:59:59.000Z

29

Enhanced Micellar Catalysis LDRD.  

SciTech Connect (OSTI)

The primary goals of the Enhanced Micellar Catalysis project were to gain an understanding of the micellar environment of DF-200, or similar liquid CBW surfactant-based decontaminants, as well as characterize the aerosolized DF-200 droplet distribution and droplet chemistry under baseline ITW rotary atomization conditions. Micellar characterization of limited surfactant solutions was performed externally through the collection and measurement of Small Angle X-Ray Scattering (SAXS) images and Cryo-Transmission Electron Microscopy (cryo-TEM) images. Micellar characterization was performed externally at the University of Minnesota's Characterization Facility Center, and at the Argonne National Laboratory Advanced Photon Source facility. A micellar diffusion study was conducted internally at Sandia to measure diffusion constants of surfactants over a concentration range, to estimate the effective micelle diameter, to determine the impact of individual components to the micellar environment in solution, and the impact of combined components to surfactant phase behavior. Aerosolized DF-200 sprays were characterized for particle size and distribution and limited chemical composition. Evaporation rates of aerosolized DF-200 sprays were estimated under a set of baseline ITW nozzle test system parameters.

Betty, Rita G.; Tucker, Mark David; Taggart, Gretchen; Kinnan, Mark K.; Glen, Crystal Chanea; Rivera, Danielle; Sanchez, Andres; Alam, Todd Michael

2012-12-01T23:59:59.000Z

30

Fuel Synthesis Catalysis Laboratory (Fact Sheet)  

SciTech Connect (OSTI)

This fact sheet provides information about Fuel Synthesis Catalysis Laboratory capabilities and applications at NREL's National Bioenergy Center.

Not Available

2011-07-01T23:59:59.000Z

31

Fuel Synthesis Catalysis Laboratory (Fact Sheet)  

SciTech Connect (OSTI)

This fact sheet provides information about Fuel Synthesis Catalysis Laboratory capabilities and applications at NREL's National Bioenergy Center.

Not Available

2013-07-01T23:59:59.000Z

32

Basic Research Needs: Catalysis for Energy  

SciTech Connect (OSTI)

The report presents results of a workshop held August 6-8, 2007, by DOE SC Basic Energy Sciences to determine the basic research needs for catalysis research.

Bell, Alexis T.; Gates, Bruce C.; Ray, Douglas; Thompson, Michael R.

2008-03-11T23:59:59.000Z

33

SOUTHWEST CATALYSIS SOCIETY 2008 SPRING SYMPOSIUM  

E-Print Network [OSTI]

Design: FCC Feed Hydrotreating Catalysis 11:35 AM Lunch Break/Poster Preview 1:00 PM Zachary T. Ball

Natelson, Douglas

34

Low-Temperature Hydrocarbon/CO Oxidation Catalysis in Support...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

& Publications Low-Temperature HydrocarbonCO Oxidation Catalysis in Support of HCCI Emission Control Low-Temperature HydrocarbonCO Oxidation Catalysis in Support of HCCI...

35

Shining Light on Catalysis | Stanford Synchrotron Radiation Lightsourc...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bokhoven, Professor for Heterogeneous Catalysis Institute for Chemical and Bioengineering ETH Zurich Head of Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light...

36

Bimetallic and Ternary Alloys for Improved Oxygen Reduction Catalysis...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bimetallic and Ternary Alloys for Improved Oxygen Reduction Catalysis . Bimetallic and Ternary Alloys for Improved Oxygen Reduction Catalysis . Abstract: The research described in...

37

Thermochemical Conversion: Using Heat and Catalysis to Make Biofuels...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Conversion: Using Heat and Catalysis to Make Biofuels and Bioproducts Thermochemical Conversion: Using Heat and Catalysis to Make Biofuels and Bioproducts The Bioenergy...

38

Center for Catalysis at Iowa State University  

SciTech Connect (OSTI)

The overall objective of this proposal is to enable Iowa State University to establish a Center that enjoys world-class stature and eventually enhances the economy through the transfer of innovation from the laboratory to the marketplace. The funds have been used to support experimental proposals from interdisciplinary research teams in areas related to catalysis and green chemistry. Specific focus areas included: • Catalytic conversion of renewable natural resources to industrial materials • Development of new catalysts for the oxidation or reduction of commodity chemicals • Use of enzymes and microorganisms in biocatalysis • Development of new, environmentally friendly reactions of industrial importance These focus areas intersect with barriers from the MYTP draft document. Specifically, section 2.4.3.1 Processing and Conversion has a list of bulleted items under Improved Chemical Conversions that includes new hydrogenation catalysts, milder oxidation catalysts, new catalysts for dehydration and selective bond cleavage catalysts. Specifically, the four sections are: 1. Catalyst development (7.4.12.A) 2. Conversion of glycerol (7.4.12.B) 3. Conversion of biodiesel (7.4.12.C) 4. Glucose from starch (7.4.12.D) All funded projects are part of a soybean or corn biorefinery. Two funded projects that have made significant progress toward goals of the MYTP draft document are: Catalysts to convert feedstocks with high fatty acid content to biodiesel (Kraus, Lin, Verkade) and Conversion of Glycerol into 1,3-Propanediol (Lin, Kraus). Currently, biodiesel is prepared using homogeneous base catalysis. However, as producers look for feedstocks other than soybean oil, such as waste restaurant oils and rendered animal fats, they have observed a large amount of free fatty acids contained in the feedstocks. Free fatty acids cannot be converted into biodiesel using homogeneous base-mediated processes. The CCAT catalyst system offers an integrated and cooperative catalytic system that performs both esterification (of free fatty acids) and transesterification (of soybean oil) in a one-pot fashion. This will allow the biodiesel producers to use the aforementioned cheap feedstocks without any pretreatment. In addition, the catalyst system is heterogeneous and is highly recyclable and reusable. Although markets currently exist for glycerin, concern is mounting that the price of glycerin may plummet to $.05 - $.10 per pound if future production exceeds demand. Developing a system to make high value chemicals such as 1,3-propanediol from the glycerin stream will add value for biodiesel producers who implement the new technology. Given the fact that both DuPont and Shell chemicals have announced the commercialization of two new PDO-based polymers, a rapid increase of market demand for a cheaper PDO source is very likely. 4. Comparison of actual accomplishments with goals and objectives From our progress reports, the four areas are: 1. Catalyst development (7.4.12.A) 2. Conversion of glycerol (7.4.12.B) 3. Conversion of biodiesel (7.4.12.C) 4. Glucose from starch (7.4.12.D)

Kraus, George A.

2006-10-17T23:59:59.000Z

39

"Nanocrystal bilayer for tandem catalysis"  

SciTech Connect (OSTI)

Supported catalysts are widely used in industry and can be optimized by tuning the composition and interface of the metal nanoparticles and oxide supports. Rational design of metal-metal oxide interfaces in nanostructured catalysts is critical to achieve better reaction activities and selectivities. We introduce here a new class of nanocrystal tandem catalysts that have multiple metal-metal oxide interfaces for the catalysis of sequential reactions. We utilized a nanocrystal bilayer structure formed by assembling platinum and cerium oxide nanocube monolayers of less than 10 nm on a silica substrate. The two distinct metal-metal oxide interfaces, CeO2-Pt and Pt-SiO2, can be used to catalyse two distinct sequential reactions. The CeO2-Pt interface catalysed methanol decomposition to produce CO and H2, which were subsequently used for ethylene hydroformylation catalysed by the nearby Pt-SiO2 interface. Consequently, propanal was produced selectively from methanol and ethylene on the nanocrystal bilayer tandem catalyst. This new concept of nanocrystal tandem catalysis represents a powerful approach towards designing high-performance, multifunctional nanostructured catalysts

Yamada, Yusuke; Tsung, Chia Kuang; Huang, Wenyu; Huo, Ziyang; E.Habas, Susan E; Soejima, Tetsuro; Aliaga, Cesar E; Samorjai, Gabor A; Yang, Peidong

2011-01-24T23:59:59.000Z

40

Nanocrystal assembly for tandem catalysis  

DOE Patents [OSTI]

The present invention provides a nanocrystal tandem catalyst comprising at least two metal-metal oxide interfaces for the catalysis of sequential reactions. One embodiment utilizes a nanocrystal bilayer structure formed by assembling sub-10 nm platinum and cerium oxide nanocube monolayers on a silica substrate. The two distinct metal-metal oxide interfaces, CeO.sub.2--Pt and Pt--SiO.sub.2, can be used to catalyze two distinct sequential reactions. The CeO.sub.2--Pt interface catalyzed methanol decomposition to produce CO and H.sub.2, which were then subsequently used for ethylene hydroformylation catalyzed by the nearby Pt--SiO.sub.2 interface. Consequently, propanal was selectively produced on this nanocrystal bilayer tandem catalyst.

Yang, Peidong; Somorjai, Gabor; Yamada, Yusuke; Tsung, Chia-Kuang; Huang, Wenyu

2014-10-14T23:59:59.000Z

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Magnetic Catalysis vs Magnetic Inhibition  

E-Print Network [OSTI]

We discuss the fate of chiral symmetry in an extremely strong magnetic field B. We investigate not only quark fluctuations but also neutral meson effects. The former would enhance the chiral-symmetry breaking at finite B according to the Magnetic Catalysis, while the latter would suppress the chiral condensate once B exceeds the scale of the hadron structure. Using a chiral model we demonstrate how neutral mesons are subject to the dimensional reduction and the low dimensionality favors the chiral-symmetric phase. We point out that this effect, the Magnetic Inhibition, can be a feasible explanation for recent lattice-QCD data indicating the decreasing behavior of the chiral-restoration temperature with increasing B.

Kenji Fukushima; Yoshimasa Hidaka

2012-09-06T23:59:59.000Z

42

Geometrically induced magnetic catalysis and critical dimensions  

E-Print Network [OSTI]

We discuss the combined effect of magnetic fields and geometry in interacting fermionic systems. At leading order in the heat-kernel expansion, the infrared singularity (that in flat space leads to the magnetic catalysis) is regulated by the chiral gap effect and the catalysis is deactivated by effect of the curvature. We discover that an infrared singularity may reappear from higher-order terms in the heat kernel expansion leading to a novel form of geometrically induced magnetic catalysis (absent in flat space). The dynamical mass squared is then modified not only due to the chiral gap effect by an amount proportional to the curvature, but also by a magnetic shift $\\propto (4-D)eB$ where $D$ represents the number of space-time dimensions. We argue that $D=4$ is a critical dimension across which the behaviour of the magnetic shift changes qualitatively.

Antonino Flachi; Kenji Fukushima; Vincenzo Vitagliano

2015-02-21T23:59:59.000Z

43

Geometrically induced magnetic catalysis and critical dimensions  

E-Print Network [OSTI]

We discuss the combined effect of magnetic fields and geometry in interacting fermionic systems. At leading order in the heat-kernel expansion, the infrared singularity (that in flat space leads to the magnetic catalysis) is regulated by the chiral gap effect and the catalysis is deactivated by effect of the curvature. We discover that an infrared singularity may reappear from higher-order terms in the heat kernel expansion leading to a novel form of geometrically induced magnetic catalysis (absent in flat space). The dynamical mass squared is then modified not only due to the chiral gap effect by an amount proportional to the curvature, but also by a magnetic shift $\\propto (4-D)eB$ where $D$ represents the number of space-time dimensions. We argue that $D=4$ is a critical dimension across which the behaviour of the magnetic shift changes qualitatively.

Flachi, Antonino; Vitagliano, Vincenzo

2015-01-01T23:59:59.000Z

44

paper topics  

E-Print Network [OSTI]

The final paper must be about 10 pages long, written in Latex, and on a topic ... The topic must be chosen by March 21st, a first draft (which must be complete) is.

2013-03-10T23:59:59.000Z

45

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

o P-159 Carbon Dioxide Hydrogenation for Methanol Synthesis:Carbon dioxide activation mechanisms for low temperature partial hydrogenation to methanol

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

46

End Functinalization of Polyisobutylenes and their Applications in Dyeing Polyolefins and in Homogeneous Catalysis  

E-Print Network [OSTI]

, in the pharmaceutical industry and in the food industry. Polyisobutylene was first developed by the BASF in 1931 and is sold under the trade name ?Oppanol B? or ?Glissopal? depending on its molecular weight. These commercial materials are produced via cationic... that require carbocationic polymerization, PIB oligomers used in this study were commercially available, inexpensive and available under the trade name Glissopal from BASF (MW = 1000, DP = 18 or MW = 2300, DP = 41). The Bergbreiter group is one of a number...

Boralugodage, Nilusha P

2013-06-05T23:59:59.000Z

47

Converting Homogeneous to Heterogeneous in Electrophilic Catalysis using Monodisperse Metal Nanoparticles  

E-Print Network [OSTI]

Synthesis of One Nanometer Rh and Pt Particles Supported on Mesoporous Silica: Catalytic Activity for Ethylene and Pyrrole

Witham, Cole A.

2011-01-01T23:59:59.000Z

48

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

measurements. With an infrared laser, heating and coolingbeam for detection. Infrared laser heating is a successful

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

49

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

due to low solubility of syngas remain a problem for e?cientof methane to form syngas. 2 However, the structure andin the production of syngas and hydrogen from fossil and

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

50

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

metal composites, nonmetal catalysts such as refractory compounds (borides, carbides,metal-coordination); H 2 -aided deoxygenation giving water plus a surface carbide (

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

51

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

112 Koningsberger, D.C. , 3 Konya, Zoltan, 179 Koptyug, IgorImre Labadi § , Zoltan Konya ‡ , Imre Kiricsi ‡ Department

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

52

The Development and Application of Homogeneous and Heterogeneous Late Metal Complexes in Catalysis  

E-Print Network [OSTI]

optimization of any process can be done in significantly less time and with less effort than with a batch reactor.

Witham, Cole

2010-01-01T23:59:59.000Z

53

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

producing results that in- dicate that iron loaded zeolite exhibits a strong ability to convert methanol

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

54

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

Department of Chemical and Petroleum Engineering, UniversityDepartment of Chemical and Petroleum Engineering, University

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

55

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

led to outstanding catalysts, showing an excellent activity without leaching of metal up to ten recycling

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

56

ISHHC XIII International Symposium on the Relations between Homogeneous and Heterogeneous Catalysis  

E-Print Network [OSTI]

Catalytic Processes for Sustainable Biomass Con- version”Catalytic Processes for Sustainable Biomass Conversion Istv´Catalyses for New Sustainable Green Processes on Catalyst

Somorjai Ed., G.A.

2007-01-01T23:59:59.000Z

57

USD Catalysis Group for Alternative Energy  

SciTech Connect (OSTI)

The South Dakota Catalysis Group (SDCG) is a collaborative project with mission to develop advanced catalysts for energy conversion with two primary goals: (1) develop photocatalytic systems in which polyfunctionalized TiO2 are the basis for hydrogen/oxygen synthesis from water and sunlight (solar fuels group), (2) develop new materials for hydrogen utilization in fuel cells (fuel cell group). In tandem, these technologies complete a closed chemical cycle with zero emissions.

James D. Hoefelmeyer, Ranjit Koodali, Grigoriy Sereda, Dan Engebretson, Hao Fong, Jan Puszynski, Rajesh Shende, Phil Ahrenkiel

2012-03-13T23:59:59.000Z

58

Nanoscale Advances in Catalysis and Energy Applications  

SciTech Connect (OSTI)

In this perspective, we present an overview of nanoscience applications in catalysis, energy conversion, and energy conservation technologies. We discuss how novel physical and chemical properties of nanomaterials can be applied and engineered to meet the advanced material requirements in the new generation of chemical and energy conversion devices. We highlight some of the latest advances in these nanotechnologies and provide an outlook at the major challenges for further developments.

Li, Yimin; Somorjai, Gabor A.

2010-05-12T23:59:59.000Z

59

Catalysis by Design: Bridging the Gap Between Theory and Experiments...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Between Theory and Experiments at Nanoscale Level Catalysis by Design: Bridging the Gap Between Theory and Experiments at Nanoscale Level Studies on a simple platinum-alumina...

60

Catalysis by Design: Bridging the Gap between Theory and Experiments...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

between Theory and Experiments Catalysis by Design: Bridging the Gap between Theory and Experiments Poster presentation at the 2007 Diesel Engine-Efficiency & Emissions Research...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Catalysis by Design - Theoretical and Experimental Studies of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Design - Theoretical and Experimental Studies of Model Catalysts for Lean NOx Treatment Catalysis by Design - Theoretical and Experimental Studies of Model Catalysts for Lean NOx...

62

Plasma-Activated Lean NOx Catalysis for Heavy-Duty Diesel Emissions...  

Broader source: Energy.gov (indexed) [DOE]

vs. Plasma-Facilitated Lean NOx Catalysis Selective reduction of NOx in oxygen rich environments with plasma-assisted catalysis: Catalyst development and mechanistic...

63

Neutrons for Catalysis: A Workshop on Neutron Scattering Techniques for Studies in Catalysis  

E-Print Network [OSTI]

-EM Fischer Tropsch Catalysis on Fe- or Co-catalysts, ,,CTL" Coal to Liquids ­ ,a rough (?) analogy #12;Peter Albers, AQ-EM Carbonaceous Deposits on Catalysts #12;Peter Albers, AQ-EM IINS on Coked Catalysts from Industrial Plants High-temperature and low-temperature cokes deposited on catalysts during

Pennycook, Steve

64

Lithium Diisopropylamide-Mediated Enolization: Catalysis by Hemilabile Ligands  

E-Print Network [OSTI]

Lithium Diisopropylamide-Mediated Enolization: Catalysis by Hemilabile Ligands Antonio Ramirez of a lithium diisopropylamide (LDA)-mediated ester enolization. Hemilabile amino ether MeOCH2CH2NMe2, binding-based catalysis are thwarted by the occlusion of the catalyst on the lithium salt products and byproducts (eq 1

Collum, David B.

65

Catalysis and Synthesis | Argonne National Laboratory  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed New Substation Sites ProposedOccupational Health Services >Catalysis and Synthesis

66

Catalysis Working Group | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists' ResearchTheMarketing,Energy-ChevronSeveral salesCarolyn L.in aDataThe CatalysisThe

67

Opportunities in Catalysis Research Using Synchrotron Radiation  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006 The 2002 WholesaleEnergy'sRunningOperations Two Argonnein Catalysis

68

Accounting for Scale in Catalysis | EMSL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAbout the Building Technologies OfficeAccounting for Scale in Catalysis

69

This issue of Topics in Catalysis is devoted to ``Nanotechnology in Catalysis'' and covers some of the  

E-Print Network [OSTI]

silica, catalyst supports and catalytic membranes. Nanosized hollow spheres (silica or carbon) have been crystal structures, electronic configurations, or surface compositions that can only be obtained with nano of Nanotechnology. A well-known advan- tage of reducing particle size is the increase in surface area per unit

Resasco, Daniel

70

Experimental evidence of foam homogenization  

SciTech Connect (OSTI)

The propagation of an ionization wave through a subcritical foam is studied under inertial confinement fusion conditions. Independent measurements of the ionization wave velocity are compared with hydrodynamic simulations and analytical models. It is shown that simulations of a homogeneous material at equivalent density strongly overestimate the front velocity. The internal foam structure can be accounted for with a simple model of foam homogenization that allows improving agreement between experiment and calculations.

Nicolaie, Ph.; Olazabal-Loume, M.; Tikhonchuk, V. [Univ. Bordeaux-CNRS-CEA, CELIA F-33405 Talence cedex (France); Fujioka, S.; Sunahara, A. [Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita Osaka 565-0871 (Japan); Borisenko, N.; Gus'kov, S.; Orekov, A. [P. N. Lebedev Physical Institute, RAS Leninskii Prospect 53, Moscow 119991 (Russian Federation); Grech, M. [Max-Planck-Institute for the Physics of Complex Systems, D-01187 Dresden (Germany); Riazuelo, G. [CEA, DAM, DIF, F-91297 Arpajon (France); Labaune, C. [Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, Palaiseau (France); Velechowski, J. [Czech Technical University in Prague, Technicka 2, 166 27 Prague 6 (Czech Republic); Univ. Bordeaux-CNRS-CEA, CELIA F-33405 Talence cedex (France)

2012-11-15T23:59:59.000Z

71

Theoretical investigation of solar energy conversion and water oxidation catalysis  

E-Print Network [OSTI]

Solar energy conversion and water oxidation catalysis are two great scientific and engineering challenges that will play pivotal roles in a future sustainable energy economy. In this work, I apply electronic structure ...

Wang, Lee-Ping

2011-01-01T23:59:59.000Z

72

Catalysis Working Group Kick-Off Meeting Agenda | Department...  

Energy Savers [EERE]

Kick-Off Meeting Agenda Agenda for the kick-off meeting of the U.S. Department of Energy Fuel Cell Technologies Program's Catalysis Working Group, held May 14, 2012, in Arlington,...

73

Lean NOx Trap Catalysis for Lean Natural Gas Engine Applications  

SciTech Connect (OSTI)

Distributed energy is an approach for meeting energy needs that has several advantages. Distributed energy improves energy security during natural disasters or terrorist actions, improves transmission grid reliability by reducing grid load, and enhances power quality through voltage support and reactive power. In addition, distributed energy can be efficient since transmission losses are minimized. One prime mover for distributed energy is the natural gas reciprocating engine generator set. Natural gas reciprocating engines are flexible and scalable solutions for many distributed energy needs. The engines can be run continuously or occasionally as peak demand requires, and their operation and maintenance is straightforward. Furthermore, system efficiencies can be maximized when natural gas reciprocating engines are combined with thermal energy recovery for cooling, heating, and power applications. Expansion of natural gas reciprocating engines for distributed energy is dependent on several factors, but two prominent factors are efficiency and emissions. Efficiencies must be high enough to enable low operating costs, and emissions must be low enough to permit significant operation hours, especially in non-attainment areas where emissions are stringently regulated. To address these issues the U.S. Department of Energy and the California Energy Commission launched research and development programs called Advanced Reciprocating Engine Systems (ARES) and Advanced Reciprocating Internal Combustion Engines (ARICE), respectively. Fuel efficiency and low emissions are two primary goals of these programs. The work presented here was funded by the ARES program and, thus, addresses the ARES 2010 goals of 50% thermal efficiency (fuel efficiency) and <0.1 g/bhp-hr emissions of oxides of nitrogen (NOx). A summary of the goals for the ARES program is given in Table 1-1. ARICE 2007 goals are 45% thermal efficiency and <0.015 g/bhp-hr NOx. Several approaches for improving the efficiency and emissions of natural gas reciprocating engines are being pursued. Approaches include: stoichiometric engine operation with exhaust gas recirculation and three-way catalysis, advanced combustion modes such as homogeneous charge compression ignition, and extension of the lean combustion limit with advanced ignition concepts and/or hydrogen mixing. The research presented here addresses the technical approach of combining efficient lean spark-ignited natural gas combustion with low emissions obtained from a lean NOx trap catalyst aftertreatment system. This approach can be applied to current lean engine technology or advanced lean engines that may result from related efforts in lean limit extension. Furthermore, the lean NOx trap technology has synergy with hydrogen-assisted lean limit extension since hydrogen is produced from natural gas during the lean NOx trap catalyst system process. The approach is also applicable to other lean engines such as diesel engines, natural gas turbines, and lean gasoline engines; other research activities have focused on those applications. Some commercialization of the technology has occurred for automotive applications (both diesel and lean gasoline engine vehicles) and natural gas turbines for stationary power. The research here specifically addresses barriers to commercialization of the technology for large lean natural gas reciprocating engines for stationary power. The report presented here is a comprehensive collection of research conducted by Oak Ridge National Laboratory (ORNL) on lean NOx trap catalysis for lean natural gas reciprocating engines. The research was performed in the Department of Energy's ARES program from 2003 to 2007 and covers several aspects of the technology. All studies were conducted at ORNL on a Cummins C8.3G+ natural gas engine chosen based on industry input to simulate large lean natural gas engines. Specific technical areas addressed by the research include: NOx reduction efficiency, partial oxidation and reforming chemistry, and the effects of sulfur poisons on the partial oxidation

Parks, II, James E [ORNL; Storey, John Morse [ORNL; Theiss, Timothy J [ORNL; Ponnusamy, Senthil [ORNL; Ferguson, Harley Douglas [ORNL; Williams, Aaron M [ORNL; Tassitano, James B [ORNL

2007-09-01T23:59:59.000Z

74

Value iteration for (switched) homogeneous systems  

E-Print Network [OSTI]

In this note, we prove that dynamic programming value iteration converges uniformly for discrete-time homogeneous systems and continuous-time switched homogeneous systems. For discrete-time homogeneous systems, rather than ...

Dahleh, Munther A.

75

Reliable computation of homogeneous azeotropes  

SciTech Connect (OSTI)

It is important to determine the existence and composition of homogeneous azeotropes in the analysis of phase behavior and in the synthesis and design of separation systems, from both theoretical and practical standpoints. A new method for reliably locating any and all homogeneous azeotropes for multicomponent mixtures is presented. The method also verifies the nonexistence of homogeneous azeotropes if none are present. The method is based on interval analysis, in particular an interval-Newton/generalized-bisection-algorithm providing a mathematical and computational guarantee that all azeotropes are located. This general-purpose technique can be applied in connection with any thermodynamic models. The technique is illustrated in several example problems using the Wilson, NRTL, and UNIQUAC activity-coefficient models.

Maier, R.W.; Brennecke, J.F.; Stadtherr, M.A. [Univ. of Notre Dame, IN (United States). Dept. of Chemical Engineering] [Univ. of Notre Dame, IN (United States). Dept. of Chemical Engineering

1998-08-01T23:59:59.000Z

76

Some General Themes in Catalysis at LANL  

SciTech Connect (OSTI)

Some general themes in catalysis at LANL are: (1) Storage and release of energy within chemical bonds (e.g. H{sub 2} storage in and release from covalent bonds, N{sub 2} functionalization, CO{sub 2} functionalization, H{sub 2} oxidation/evolution, O{sub 2} reduction/evolution); (2) Can we control the chemistry of reactive substrates to effect energy relevant transformations in non-traditional media (e.g. can we promote C-C couplings, dehydrations, or hydrogenations in water under relatively mild conditions)? (3) Can we supplant precious metal or rare earth catalysts to effect these transformations, by using earth abundant metals/elements instead? Can we use organocatalysis and circumvent the use of metals completely? (4) Can we improve upon existing rare earth catalyst systems (e.g. in rare earth oxides pertinent to fluid cracking or polymerization) and reduce amounts required for catalytic efficacy? Carbohydrates can be accessed from non-food based biomass sources such as woody residues and switchgrass. After extracted from the plant source, our goal is to upgrade these classes of molecules into useful fuels.

Gordon, John C. [Los Alamos National Laboratory

2012-07-19T23:59:59.000Z

77

E-Print Network 3.0 - alkane oxidation catalysis Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

hydrogen... Reforming of Methane 10 Gas Phase Incorporation of Pd onto Iron-Ceria Aerogels for Water Gas Shift Catalysis... at the 20 North American Meeting of the Catalysis...

78

Final technical report, Symposium on New Theoretical Concepts and Directions in Catalysis  

SciTech Connect (OSTI)

We organized in August 2013 a “Symposium on New Theoretical Concepts and Directions in Catalysis” with the participation of 20 invited distinguished quantum chemists and other researchers who use computations to study catalysis. Symposium website; http://catalysis.cnsi.ucsb.edu/

Metiu, Horia [University of California, Santa Barbara

2014-08-22T23:59:59.000Z

79

Catalysis-by-design impacts assessment  

SciTech Connect (OSTI)

Catalyst researchers have always recognized the need to develop a detailed understanding of the mechanisms of catalytic processes, and have hoped that it would lead to developing a theoretical predictive base to guide the search for new catalysts. This understanding allows one to develop a set of hierarchical models, from fundamental atomic-level ab-initio models to detailed engineering simulations of reactor systems, to direct the search for optimized, efficient catalyst systems. During the last two decades, the explosions of advanced surface analysis techniques have helped considerably to develop the building blocks for understanding various catalytic reactions. An effort to couple these theoretical and experimental advances to develop a set of hierarchical models to predict the nature of catalytic materials is a program entitled Catalysis-by-Design (CRD).'' In assessing the potential impacts of CBD on US industry, the key point to remember is that the value of the program lies in developing a novel methodology to search for new catalyst systems. Industrial researchers can then use this methodology to develop proprietary catalysts. Most companies involved in catalyst R D have two types of ongoing projects. The first type, what we call market-driven R D,'' are projects that support and improve upon a company's existing product lines. Project of the second type, technology-driven R D,'' are longer term, involve the development of totally new catalysts, and are initiated through scientists' research ideas. The CBD approach will impact both types of projects. However, this analysis indicates that the near-term impacts will be on market-driven'' projects. The conclusions and recommendations presented in this report were obtained by the authors through personal interviews with individuals involved in a variety of industrial catalyst development programs and through the three CBD workshops held in the summer of 1989. 34 refs., 7 figs., 7 tabs.

Fassbender, L L; Young, J K [Pacific Northwest Lab., Richland, WA (USA); Sen, R K [Sen (R.K.) and Associates, Washington, DC (USA)

1991-05-01T23:59:59.000Z

80

High-Spin Cobalt Hydrides for Catalysis  

SciTech Connect (OSTI)

Organometallic chemists have traditionally used catalysts with strong-field ligands that give low-spin complexes. However, complexes with a weak ligand field have weaker bonds and lower barriers to geometric changes, suggesting that they may lead to more rapid catalytic reactions. Developing our understanding of high-spin complexes requires the use of a broader range of spectroscopic techniques, but has the promise of changing the mechanism and/or selectivity of known catalytic reactions. These changes may enable the more efficient utilization of chemical resources. A special advantage of cobalt and iron catalysts is that the metals are more abundant and cheaper than those currently used for major industrial processes that convert unsaturated organic molecules and biofeedstocks into useful chemicals. This project specifically evaluated the potential of high-spin cobalt complexes for small-molecule reactions for bond rearrangement and cleavage reactions relevant to hydrocarbon transformations. We have learned that many of these reactions proceed through crossing to different spin states: for example, high-spin complexes can flip one electron spin to access a lower-energy reaction pathway for beta-hydride elimination. This reaction enables new, selective olefin isomerization catalysis. The high-spin cobalt complexes also cleave the C-O bond of CO2 and the C-F bonds of fluoroarenes. In each case, the detailed mechanism of the reaction has been determined. Importantly, we have discovered that the cobalt catalysts described here give distinctive selectivities that are better than known catalysts. These selectivities come from a synergy between supporting ligand design and electronic control of the spin-state crossing in the reactions.

Holland, Patrick L. [Yale University] [Yale University

2013-08-29T23:59:59.000Z

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Allylation of acetanilides with allyl acetate under conditions of metal-complex catalysis combined with phase-transfer catalysis  

SciTech Connect (OSTI)

Acetanilides are alkylated at the nitrogen atom under the conditions of phase-transfer catalysis. For the case of the reaction of acetanilides with allyl acetate the authors showed that 2-alkenyl esters can be used for the alkylation of acetanilides under the conditions of phase-transfer catalysis in the presence of the complexes of zero valent palladium. N-Acetylskatole was obtained with a yield of 50% from N-allyl-2-bromoacetanilide by intramolecular cyclization in the presence of Od(OAc)/sub 2/ as catalyst.

Lebedev, S.A.; Leonova, Yu.P.; Berestova, S.S.; Petrov, E.S.

1988-10-20T23:59:59.000Z

82

Frontiers in Catalysis Science and Engineering Seminar Series  

E-Print Network [OSTI]

THE CATALYTIC UPGRADE OF PYROLYSIS OIL IN VAPOR AND LIQUID PHASES Presented by... Daniel E. Resasco ·Douglas Engineering ·University of Oklahoma Abstract An effective approach to stabilize pyrolysis oil is conducting for Interfacial Reaction Engineering (CIRE) http://www.ou.edu/catalysis/ Center for Biomass Befining (CBR) http

83

Lithium Diisopropylamide-Mediated Ortholithiations: Lithium Chloride Catalysis  

E-Print Network [OSTI]

Lithium Diisopropylamide-Mediated Ortholithiations: Lithium Chloride Catalysis Lekha Gupta, 2008 Ortholithiations of a range of arenes mediated by lithium diisopropylamide (LDA) in THF at -78 °C protocols with unpurified commercial samples of n-butyl- lithium to prepare LDA or commercially available

Collum, David B.

84

Frontiers in Catalysis Science and Engineering Seminar Series  

E-Print Network [OSTI]

Frontiers in Catalysis Science and Engineering Seminar Series On the role of hydrogen of Chemical & Biological Engineering ·University of Wisconsin - Madison Abstract Hydrogen is a frequent principles governing the role of hydrogen in a wide range of catalytic transformations begin to emerge

85

Overview of surface science and catalysis by Qifei Wu  

E-Print Network [OSTI]

surfaces: single crystal transition metals, metal nanoparticles (Au), metal oxides, sulfides, carbides: · Metcars are the better catalysts for HDS than the other metal carbide materials. · Metcars have better: Sulfides (RuS2), carbides (MoC, TiC) #12;Density Functional Theory in Catalysis Employ DFT to understand

86

Coherence delay augmented laser beam homogenizer  

DOE Patents [OSTI]

The geometrical restrictions on a laser beam homogenizer are relaxed by ug a coherence delay line to separate a coherent input beam into several components each having a path length difference equal to a multiple of the coherence length with respect to the other components. The components recombine incoherently at the output of the homogenizer, and the resultant beam has a more uniform spatial intensity suitable for microlithography and laser pantogography. Also disclosed is a variable aperture homogenizer, and a liquid filled homogenizer.

Rasmussen, P.; Bernhardt, A.

1993-06-29T23:59:59.000Z

87

NOTE: OPTIMAL NON-HOMOGENEOUS COMPOSITES FOR ...  

E-Print Network [OSTI]

NOTE: OPTIMAL NON-HOMOGENEOUS COMPOSITES FOR. DYNAMIC LOADING REVISITED. R. TAVAKOLI. 1. Problem formulation. Consider ? ? Rd (

R. Tavakoli

2012-10-02T23:59:59.000Z

88

Coherence delay augmented laser beam homogenizer  

DOE Patents [OSTI]

The geometrical restrictions on a laser beam homogenizer are relaxed by ug a coherence delay line to separate a coherent input beam into several components each having a path length difference equal to a multiple of the coherence length with respect to the other components. The components recombine incoherently at the output of the homogenizer, and the resultant beam has a more uniform spatial intensity suitable for microlithography and laser pantogography. Also disclosed is a variable aperture homogenizer, and a liquid filled homogenizer.

Rasmussen, Paul (Livermore, CA); Bernhardt, Anthony (Berkeley, CA)

1993-01-01T23:59:59.000Z

89

Methanol Synthesis over Cu/ZnO/Al2O3: The Active Site in Industrial Catalysis  

SciTech Connect (OSTI)

Unlike homogeneous catalysts, heterogeneous catalysts that have been optimized through decades are typically so complex and hard to characterize that the nature of the catalytically active site is not known. This is one of the main stumbling blocks in developing rational catalyst design strategies in heterogeneous catalysis. We show here how to identify the crucial atomic structure motif for the industrial Cu/ZnO/Al{sub 2}O{sub 3} methanol synthesis catalyst. Using a combination of experimental evidence from bulk-, surface-sensitive and imaging methods collected on real high-performance catalytic systems in combination with DFT calculations. We show that the active site consists of Cu steps peppered with Zn atoms, all stabilized by a series of well defined bulk defects and surface species that need jointly to be present for the system to work.

Behrens, Malte

2012-03-28T23:59:59.000Z

90

One- and two-dimensional infrared spectroscopic studies of solution-phase homogeneous catalysis and spin-forbidden reactions  

SciTech Connect (OSTI)

Understanding chemical reactions requires the knowledge of the elementary steps of breaking and making bonds, and often a variety of experimental techniques are needed to achieve this goal. The initial steps occur on the femto- through picosecond time-scales, requiring the use of ultrafast spectroscopic methods, while the rate-limiting steps often occur more slowly, requiring alternative techniques. Ultrafast one and two-dimensional infrared and step-scan FTIR spectroscopies are used to investigate the photochemical reactions of four organometallic complexes. The analysis leads to a detailed understanding of mechanisms that are general in nature and may be applicable to a variety of reactions.

Sawyer, Karma Rae

2008-12-12T23:59:59.000Z

91

HOMOGENEOUS CATALYSIS AND MASS TRANSFER IN BIPHASIC IONIC LIQUID SYSTEMS WITH COMPRESSED CO2 AND ORGANIC COMPOUNDS  

E-Print Network [OSTI]

is separating and reusing precious metal catalyst; therefore, it needs to be performed in a convenient platform. To figure out this problem, a biphasic system can be suggested in which one phase sequesters the solid catalyst and the other phase delivers...

Ahosseini, Azita

92

Molecular-Level Design of Heterogeneous Chiral Catalysis  

SciTech Connect (OSTI)

The following is a proposal to continue our multi-institutional research on heterogeneous chiral catalysis. Our team combines the use of surface-sensitive analytical techniques for the characterization of model systems with quantum and statistical mechanical calculations to interpret experimental data and guide the design of future research. Our investigation focuses on the interrelation among the three main mechanisms by which enantioselectivity can be bestowed to heterogeneous catalysts, namely: (1) by templating chirality via the adsorption of chiral supramolecular assemblies, (2) by using chiral modifiers capable of forming chiral complexes with the reactant and force enantioselective surface reactions, and (3) by forming naturally chiral surfaces using imprinting chiral agents. Individually, the members of our team are leaders in these various aspects of chiral catalysis, but the present program provides the vehicle to generate and exploit the synergies necessary to address the problem in a comprehensive manner. Our initial work has advanced the methodology needed for these studies, including an enantioselective titration procedure to identify surface chiral sites, infrared spectroscopy in situ at the interface between gases or liquids and solids to mimic realistic catalytic conditions, and DFT and Monte Carlo algorithms to simulate and understand chirality on surfaces. The next step, to be funded by the monies requested in this proposal, is to apply those methods to specific problems in chiral catalysis, including the identification of the requirements for the formation of supramolecular surface structures with enantioselective behavior, the search for better molecules to probe the chiral nature of the modified surfaces, the exploration of the transition from supramolecular to one-to-one chiral modification, the correlation of the adsorption characteristics of one-to-one chiral modifiers with their physical properties, in particular with their configuration, and the development of ways to imprint chiral centers on achiral solid surfaces. Chiral catalysis is not only a problem of great importance in its own right, but also the ultimate test of how to control selectivity in catalysis. The time is ripe for fundamental work in heterogeneous chiral catalysis to provide the U.S. with a leadership role in developing the next generation of catalytic processes for medicinal and agrochemical manufacturing. Our team provides the required expertise for a synergistic and comprehensive integration of physical and chemical experimentation with solid state and molecular reactivity theories to solve this problem.

Francisco Zaera

2012-03-21T23:59:59.000Z

93

acid-assisted phosphine catalysis: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110 Marshall, Garland R. 37 Catalytic Hydrogenolysis of Biphenylene with Platinum, Palladium,...

94

Pacific Northwest National Laboratory Catalysis Highlights for FY2007  

SciTech Connect (OSTI)

To reduce the nation’s dependence on imported oil, the U.S. Department of Energy (DOE) and other federal and private agencies are investing in understanding catalysis. This report focuses on catalysis research conducted by Pacific Northwest National Laboratory (PNNL) and its collaborators. Using sophisticated instruments in DOE’s Environmental Molecular Sciences Laboratory, a national scientific user facility, research was conducted to answer key questions related to the nation’s use of automotive fuels. Research teams investigated how hydrogen can be safely stored and efficiently released, critical questions to use this alternative fuel. Further, they are answering key questions to design molecular catalysts to control the transfer of hydrogen atoms, hydrides, and protons important to hydrogen production. In dealing with today’s fuels, researchers examined adsorption of noxious nitrous oxides in automotive exhaust. Beyond automotive fuel, researchers worked on catalysts to harness solar power. These catalysts include the rutile and anatase forms of titanium dioxide. Basic research was conducted on designing catalysts for these and other applications. Our scientists examined how to build catalysts with the desired properties atom by atom and molecule by molecule. In addition, this report contains brief descriptions of the outstanding accomplishments of catalysis experts at PNNL.

Garrett, Bruce C.

2007-11-15T23:59:59.000Z

95

Support for U.S. Participants at the 15th International Congress on Catalysis  

SciTech Connect (OSTI)

The grant was used to partially assist the travel expenses of U.S. academic scientists to attend the 15th International Congress on Catalysis. The conference was held in Munich, Germany from July 1-6, 2012. The importance of the International Congress was to bring together the international community of faculty members who participate in catalysis research, and to share information that would lead to further developments and directions in the field of study. Graduate students and Post Docs were invited to apply for travel assistance based on criteria established by the North American Catalysis Society (NACS) and the local Catalysis Clubs.

Wachs, Israel E.

2013-08-05T23:59:59.000Z

96

Plasma-Activated Lean NOx Catalysis for Heavy-Duty Diesel Emissions...  

Broader source: Energy.gov (indexed) [DOE]

Lean NOx Catalysis l Chemistry l Reducing Agent Effects l Collaboration with LEP CRADA l Aging Studies Plasma Initiation - + Electron Avalanche e - e - e - e - e - e - e -...

97

AQUEOUS HOMOGENEOUS REACTORTECHNICAL PANEL REPORT  

SciTech Connect (OSTI)

Considerable interest has been expressed for developing a stable U.S. production capacity for medical isotopes and particularly for molybdenum- 99 (99Mo). This is motivated by recent re-ductions in production and supply worldwide. Consistent with U.S. nonproliferation objectives, any new production capability should not use highly enriched uranium fuel or targets. Conse-quently, Aqueous Homogeneous Reactors (AHRs) are under consideration for potential 99Mo production using low-enriched uranium. Although the Nuclear Regulatory Commission (NRC) has guidance to facilitate the licensing process for non-power reactors, that guidance is focused on reactors with fixed, solid fuel and hence, not applicable to an AHR. A panel was convened to study the technical issues associated with normal operation and potential transients and accidents of an AHR that might be designed for isotope production. The panel has produced the requisite AHR licensing guidance for three chapters that exist now for non-power reactor licensing: Reac-tor Description, Reactor Coolant Systems, and Accident Analysis. The guidance is in two parts for each chapter: 1) standard format and content a licensee would use and 2) the standard review plan the NRC staff would use. This guidance takes into account the unique features of an AHR such as the fuel being in solution; the fission product barriers being the vessel and attached systems; the production and release of radiolytic and fission product gases and their impact on operations and their control by a gas management system; and the movement of fuel into and out of the reactor vessel.

Diamond, D.J.; Bajorek, S.; Bakel, A.; Flanagan, G.; Mubayi, V.; Skarda, R.; Staudenmeier, J.; Taiwo, T.; Tonoike, K.; Tripp, C.; Wei, T.; Yarsky, P.

2010-12-03T23:59:59.000Z

98

Homogeneous catalysts in hypersonic combustion  

SciTech Connect (OSTI)

Density and residence time both become unfavorably small for efficient combustion of hydrogen fuel in ramjet propulsion in air at high altitude and hypersonic speed. Raising the density and increasing the transit time of the air through the engine necessitates stronger contraction of the air flow area. This enhances the kinetic and thermodynamic tendency of H/sub 2/O to form completely, accompanied only by N/sub 2/ and any excess H/sub 2/(or O/sub 2/). The by-products to be avoided are the energetically expensive fragment species H and/or O atoms and OH radicals, and residual (2H/sub 2/ plus O/sub 2/). However, excessive area contraction raises air temperature and consequent combustion-product temperature by adiabatic compression. This counteracts and ultimately overwhelms the thermodynamic benefit by which higher density favors the triatomic product, H/sub 2/O, over its monatomic and diatomic alternatives. For static pressures in the neighborhood of 1 atm, static temperature must be kept or brought below ca. 2400 K for acceptable stability of H/sub 2/O. Another measure, whose requisite chemistry we address here, is to extract propulsive work from the combustion products early in the expansion. The objective is to lower the static temperature of the combustion stream enough for H/sub 2/O to become adequately stable before the exhaust flow is massively expanded and its composition ''frozen.'' We proceed to address this mechanism and its kinetics, and then examine prospects for enhancing its rate by homogeneous catalysts. 9 refs.

Harradine, D.M.; Lyman, J.L.; Oldenborg, R.C.; Pack, R.T.; Schott, G.L.

1989-01-01T23:59:59.000Z

99

MORLEY RANK IN HOMOGENEOUS MODELS ALEXEI KOLESNIKOV  

E-Print Network [OSTI]

MORLEY RANK IN HOMOGENEOUS MODELS ALEXEI KOLESNIKOV AND G.V.N.G. KRISHNAMURTHI Abstract. We define an appropriate analog of the Morley rank in a totally transcendental homogeneous model with type diagram D. We-extensions of rank . This is surprising, because the proof of the statement in the first-order case depends heavily

Kolesnikov, Alexei

100

acoustic materials: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

acoustic materials First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 A prototype homogenization model for...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Tandem Catalysis A Highly Efficient and Rapid Approach to Synthetic Elaboration  

E-Print Network [OSTI]

diiodide catalyzed Mukaiyama Michael-aldol reactions C.) Zirconium catalyzed synthesis of !-cyanohydrins D and rhodium catalyzed annulation. B.) Cobalt catalyzed annulation and cycloaddition C.) Rapid synthesis of pyrroles and furans D.) Organocatalytic / Lewis acid tandem catalysis 5.) Conclusions Tandem catalysis

Stoltz, Brian M.

102

Inorganic Chemistry in Hydrogen Storage and Biomass Catalysis  

SciTech Connect (OSTI)

Making or breaking C-H, B-H, C-C bonds has been at the core of catalysis for many years. Making or breaking these bonds to store or recover energy presents us with fresh challenges, including how to catalyze these transformations in molecular systems that are 'tuned' to minimize energy loss and in molecular and material systems present in biomass. This talk will discuss some challenging transformations in chemical hydrogen storage, and some aspects of the inorganic chemistry we are studying in the development of catalysts for biomass utilization.

Thorn, David [Los Alamos National Laboratory

2012-06-13T23:59:59.000Z

103

Microwaves and Chemistry: The Catalysis of an Exciting Marriage  

E-Print Network [OSTI]

. Product distrihution of microwave catalysis of carbon dioxide and water. Product Relative % yield Methane 55.1 Methanol 5.5 Acetone 4.7 C J alcohols 5.8 C 4 alcohols 28.4 o.5,------------------ 0.4 'C v >= 0.3 !i ;:I '" 0.2 &1... our first major success in cracking methane to ethylene and hydrogen [1,2], lhe destruction of chlorinated hydrocarbons [3,4], the hydrodesulfurization of hydrocracked pitch [5], and the microwave treatment of some Alberta oil sands and bitumens...

Wan, J.

104

Catalysis Working Group Meeting: June 2014 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists' ResearchTheMarketing,Energy-ChevronSeveral salesCarolyn L.in aDataThe Catalysis

105

Producing tritium in a homogenous reactor  

DOE Patents [OSTI]

A method and apparatus are described for the joint production and separation of tritium. Tritium is produced in an aqueous homogenous reactor and heat from the nuclear reaction is used to distill tritium from the lower isotopes of hydrogen.

Cawley, William E. (Richland, WA)

1985-01-01T23:59:59.000Z

106

A microreactor system for high-pressure, multiphase homogeneous and heterogeneous catalyst measurements under continuous flow  

E-Print Network [OSTI]

The shift towards biomass and lower quality fossil fuel feedstocks will require new conversion approaches. Catalysis will be critical in the processing of these new feedstocks. By studying catalysis at industrially relevant ...

Keybl, Jaroslav

2011-01-01T23:59:59.000Z

107

A Note on KKT Points of Homogeneous Programs 1'  

E-Print Network [OSTI]

A Note on KKT Points of Homogeneous Programs 1'. Y. B. Zhao 2 and D. Li 3. Abstract. Homogeneous programming is an important class of optimization ...

2005-07-11T23:59:59.000Z

108

Metal Carbonyl-Hydrosilane Reactions and Hydrosilation Catalysis  

SciTech Connect (OSTI)

Manganese carbonyl complexes serve as hydrosilation precatalysts for selectively transforming a carbonyl group into a siloxy methylene or a fully reduced methylene group. Substrates of interest include (1) aldehydes, ketones, carboxylic acids, silyl esters, and esters, and (2) their organometallic acyl counterparts. Three relevant catalytic reactions are shown. Two types of manganese precatalysts have been reported: (a) alkyl and acyl complexes (L)(C0){sub 4}MnR [L = CO, PPh{sub 3}; R = COCH{sub 3}, COPh, CH{sub 3}] and (b) halides (CO){sub 5}MnX and [(CO){sub 4}MnX]{sub 2} (X = Br, I). The former promote hydrosilation and deoxygenation catalysis; the latter promote dehydrogenative silation of alcohols and carboxylic acids as well as hydrosilation and deoxygenation of some metallocarboxylic acid derivatives. In every case studied, these Mn precatalysts are far more reactive or selective than traditional Rh(I) precatalysts.

Cutler, A. R.

2001-04-14T23:59:59.000Z

109

Spontaneous generation of local CP violation and inverse magnetic catalysis  

E-Print Network [OSTI]

In the chiral symmetric phase, the polarized instanton--anti-instanton molecule pairing induces a nontrivial repulsive interaction in the iso-scalar axial-vector channel. As a consequence, one unusual property is observed that in the chiral restoration phase, there is a first order phase transition for the spontaneous generation of local CP violation and chiral imbalance. Furthermore, it is found that external magnetic fields will lower the critical temperature for the local CP-odd phase transition and catalyze the chiral imbalance, which destroys the chiral condensate with pairing quarks between different chiralities. A reasonable strength of the repulsive interaction in the iso-scalar axial-vector channel can naturally explain the inverse magnetic catalysis around the critical temperature under external magnetic fields.

Lang Yu; Hao Liu; Mei Huang

2014-09-14T23:59:59.000Z

110

Tribal Topic Group Summary  

Broader source: Energy.gov (indexed) [DOE]

Caucus created a mission statement and resolution: - All Tribes with cultural ties to Yucca Mountain should be invited to join TEC - Ongoing funds to support Tribal Topic Group...

111

Studies toward biomimetic claisen condensation using nucleic acid templates and ribozyme catalysis  

E-Print Network [OSTI]

Many different experimental approaches were attempted to achieve carbon-carbon bond formation by nucleic acid template-directed reactions and ribozyme catalysis as potential lipid synthesizing machineries in the RNA world. A novel biomimetic...

Ryu, Youngha

2005-08-29T23:59:59.000Z

112

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial  

E-Print Network [OSTI]

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial ainsi que des exemples d'applications industrielles. Abstract -- Transformation of Sorbitol to Biofuels and biodiesel production led to first generation biofuels. Nowadays, research is focused on lignocellulosic

Boyer, Edmond

113

Combined Catalysis and Optical Screening for High Throughput Discovery of Solar Fuels Catalysts  

E-Print Network [OSTI]

Combined Catalysis and Optical Screening for High Throughput Discovery of Solar Fuels Catalysts J,b a Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, California 91125, USA b Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Faraon, Andrei

114

Molecular computations for reactions and phase transitions: applications to protein stabilization, hydrates and catalysis  

E-Print Network [OSTI]

In this work we have made significant contributions in three different areas of interest: therapeutic protein stabilization, thermodynamics of natural gas clathrate-hydrates, and zeolite catalysis. In all three fields, ...

Anderson, Brian J.

115

Final Report on Kokes Awards for the 20th North American Catalysis Society Meeting  

SciTech Connect (OSTI)

This Final Report describes how the Kokes Awards program was carried out for the 2007 meeting with regard to selection of students and disbursement of funds received from DOE and other sources. The objective of the Richard J. Kokes Travel Award program of the American Catalysis Society is to encourage graduate students to attend and participate meaningfully in the biennial North American Catalysis Society Meeting.

Wong, Michael S.

2008-01-01T23:59:59.000Z

116

ANDREA BRAIDES Homogenization of Lattice Systems  

E-Print Network [OSTI]

) Identification: identify u with some continuous parameter (e.g., its piecewise-constant interpolation; a sum(ui, uj) indexed on a scaled lattice (e.g., Zd ) Identification: identify u with some continuous.Braides: Homogenization of Lattice Systems #12;BINARY SYSTEMS: Continuous limits of ferromagnetic energies Bulk scaling

Braides, Andrea

117

Sensitivity Analysis of Combustion Timing of Homogeneous  

E-Print Network [OSTI]

to predict the start of combustion in a homogeneous charge compression ignition (HCCI) engine. Qualitative and quantitative information on the individual effects of fuel and exhaust gas recirculation on the HCCI combustion-injection gasoline HCCI engine, we find that temperature is the dominant factor in determining the start

Stefanopoulou, Anna

118

A Homogenized Energy Framework for Ferromagnetic Hysteresis  

E-Print Network [OSTI]

energy relations at the mesoscopic or lattice level based on the assumption that magnetic momentsA Homogenized Energy Framework for Ferromagnetic Hysteresis Ralph C. Smith Marcelo J. Dapino Center or spins are restricted to two orientations. Direct minimization of the Gibbs energy yields local average

119

Selected Topics in Column Generation  

E-Print Network [OSTI]

Dec 2, 2002 ... Page 1. Selected Topics in Column Generation. Marco E. Lübbecke ... is an ever recurring concept in our “selected topics.” OR/MS Subject ...

2002-12-02T23:59:59.000Z

120

Quantum Memory with a controlled homogeneous splitting  

E-Print Network [OSTI]

We propose a quantum memory protocol where a input light field can be stored onto and released from a single ground state atomic ensemble by controlling dynamically the strength of an external static and homogeneous field. The technique relies on the adiabatic following of a polaritonic excitation onto a state for which the forward collective radiative emission is forbidden. The resemblance with the archetypal Electromagnetically-Induced-Transparency (EIT) is only formal because no ground state coherence based slow-light propagation is considered here. As compared to the other grand category of protocols derived from the photon-echo technique, our approach only involves a homogeneous static field. We discuss two physical situations where the effect can be observed, and show that in the limit where the excited state lifetime is longer than the storage time, the protocols are perfectly efficient and noise-free. We compare the technique to other quantum memories, and propose atomic systems where the experiment c...

Hétet, G; Chanelière, T

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

On the energy of homogeneous cosmologies  

E-Print Network [OSTI]

An energy for the homogeneous cosmological models is presented. More specifically, using an appropriate natural prescription, we find the energy within any region with any gravitational source for a large class of gravity theories--namely those with a tetrad description--for all 9 Bianchi types. Our energy is given by the value of the Hamiltonian with homogeneous boundary conditions; this value vanishes for all regions in all Bianchi class A models, and it does not vanish for any class B model. This is so not only for Einstein's general relativity but, moreover, for the whole 3-parameter class of tetrad-teleparallel theories. For the physically favored one parameter subclass, which includes the teleparallel equivalent of Einstein's theory as an important special case, the energy for all class B models is, contrary to expectation, negative.

James M. Nester; Lau Loi So; T. Vargas

2008-03-23T23:59:59.000Z

122

Exam # 2 Topics 9.  

E-Print Network [OSTI]

Page 1. MA 341 - Fall 2006. Exam # 2 Topics. 1. Convergence of a sequence; Squeeze Theorem (Exercise 2.3.3.); Zipper Theorem (Exercise. 2.3.5.); Algebraic

1910-61-10T23:59:59.000Z

123

Highly Dispersed Pseudo-Homogeneous and Heterogeneous Catalysts Synthesized via Inverse Micelle Solutions for the Liquefaction of Coal  

SciTech Connect (OSTI)

The mission of this project was to use inverse micelle solutions to synthesize nanometer sized metal particles and test the particles as catalysts in the liquefaction of coal and other related reactions. The initial focus of the project was the synthesis of iron based materials in pseudo-homogeneous form. The frost three chapters discuss the synthesis, characterization, and catalyst testing in coal liquefaction and model coal liquefaction reactions of iron based pseudo-homogeneous materials. Later, we became interested in highly dispersed catalysts for coprocessing of coal and plastic waste. Bifunctional catalysts . to hydrogenate the coal and depolymerize the plastic waste are ideal. We began studying, based on our previously devised synthesis strategies, the synthesis of heterogeneous catalysts with a bifunctional nature. In chapter 4, we discuss the fundamental principles in heterogeneous catalysis synthesis with inverse micelle solutions. In chapter 5, we extend the synthesis of chapter 4 to practical systems and use the materials in catalyst testing. Finally in chapter 6, we return to iron and coal liquefaction now studied with the heterogeneous catalysts.

Hampden-Smith, M.; Kawola, J.S.; Martino, A.; Sault, A.G.; Yamanaka, S.A.

1999-01-05T23:59:59.000Z

124

2010 CATALYSIS GORDON RESEARCH CONFERENCE, JUNE 27 - JULY 2, 2010, NEW LONDON, NEW HAMPSHIRE  

SciTech Connect (OSTI)

Catalysis is a key technology for improving the quality of life while simultaneously reducing the adverse impact of human activities on the environment. The discovery of new catalytic processes and the improvement of existing ones are also critically important for securing the nation's energy supply. The GRC on Catalysis is considered one the most prestigious conference for catalysis research, bringing together leading researchers from both academia, industry and national labs to discuss the latest, most exciting research in catalysis and the future directions for the field. The 2010 GRC on Catalysis will follow time-honored traditions and feature invited talks from the world's leading experts in the fundamentals and applications of catalytic science and technology. We plan to have increased participation from industry. The extended discussions in the company of outstanding thinkers will stimulate and foster new science. The conference will include talks in the following areas: Alternative feedstocks for chemicals and fuels, Imaging and spectroscopy, Design of novel catalysts, Catalyst preparation fundamentals, Molecular insights through theory, Surface Science, Catalyst stability and dynamics. In 2010, the Catalysis conference will move to a larger conference room with a new poster session area that will allow 40 posters per session. The dorm rooms provide single and double accommodations, free WiFi and the registration fee includes all meals and the famous lobster dinner on Thursday night. Afternoons are open to enjoy the New England ambiance with opportunities for hiking, sailing, golf and tennis to create an outstanding conference that will help you network with colleagues, and make long lasting connections.

Abhaya Datye

2010-07-02T23:59:59.000Z

125

Growth mechanism of graphene on platinum: Surface catalysis and carbon segregation  

SciTech Connect (OSTI)

A model of the graphene growth mechanism of chemical vapor deposition on platinum is proposed and verified by experiments. Surface catalysis and carbon segregation occur, respectively, at high and low temperatures in the process, representing the so-called balance and segregation regimes. Catalysis leads to self-limiting formation of large area monolayer graphene, whereas segregation results in multilayers, which evidently “grow from below.” By controlling kinetic factors, dominantly monolayer graphene whose high quality has been confirmed by quantum Hall measurement can be deposited on platinum with hydrogen-rich environment, quench cooling, tiny but continuous methane flow and about 1000?°C growth temperature.

Sun, Jie, E-mail: jie.sun@chalmers.se; Lindvall, Niclas; Yurgens, August [Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Gothenburg (Sweden); Nam, Youngwoo [Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Gothenburg (Sweden); Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of); Cole, Matthew T. [Electrical Engineering Division, Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, CB3 0FA Cambridge (United Kingdom); Teo, Kenneth B. K. [AIXTRON Nanoinstruments Ltd., Swavesey, CB24 4FQ Cambridge (United Kingdom); Woo Park, Yung [Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)

2014-04-14T23:59:59.000Z

126

High Throughput Sample Preparation and Analysis for DNA Sequencing, PCR and Combinatorial Screening of Catalysis Based on Capillary Array Technique  

SciTech Connect (OSTI)

Sample preparation has been one of the major bottlenecks for many high throughput analyses. The purpose of this research was to develop new sample preparation and integration approach for DNA sequencing, PCR based DNA analysis and combinatorial screening of homogeneous catalysis based on multiplexed capillary electrophoresis with laser induced fluorescence or imaging UV absorption detection. The author first introduced a method to integrate the front-end tasks to DNA capillary-array sequencers. protocols for directly sequencing the plasmids from a single bacterial colony in fused-silica capillaries were developed. After the colony was picked, lysis was accomplished in situ in the plastic sample tube using either a thermocycler or heating block. Upon heating, the plasmids were released while chromsomal DNA and membrane proteins were denatured and precipitated to the bottom of the tube. After adding enzyme and Sanger reagents, the resulting solution was aspirated into the reaction capillaries by a syringe pump, and cycle sequencing was initiated. No deleterious effect upon the reaction efficiency, the on-line purification system, or the capillary electrophoresis separation was observed, even though the crude lysate was used as the template. Multiplexed on-line DNA sequencing data from 8 parallel channels allowed base calling up to 620 bp with an accuracy of 98%. The entire system can be automatically regenerated for repeated operation. For PCR based DNA analysis, they demonstrated that capillary electrophoresis with UV detection can be used for DNA analysis starting from clinical sample without purification. After PCR reaction using cheek cell, blood or HIV-1 gag DNA, the reaction mixtures was injected into the capillary either on-line or off-line by base stacking. The protocol was also applied to capillary array electrophoresis. The use of cheaper detection, and the elimination of purification of DNA sample before or after PCR reaction, will make this approach an attractive alternative to current methods for genetic analysis and disease diagnosis.

Yonghua Zhang

2002-05-27T23:59:59.000Z

127

Homogeneous catalyst formulations for methanol production  

DOE Patents [OSTI]

There is disclosed synthesis of CH.sub.3 OH from carbon monoxide and hydrogen using an extremely active homogeneous catalyst for methanol synthesis directly from synthesis gas. The catalyst operates preferably between 100.degree.-150.degree. C. and preferably at 100-150 psia synthesis gas to produce methanol. Use can be made of syngas mixtures which contain considerable quantities of other gases, such as nitrogen, methane or excess hydrogen. The catalyst is composed of two components: (a) a transition metal carbonyl complex and (b) an alkoxide component. In the simplest formulation, component (a) is a complex of nickel tetracarbonyl and component (b) is methoxide (CH.sub.3 O.sup.-), both being dissolved in a methanol solvent system. The presence of a co-solvent such as p-dioxane, THF, polyalcohols, ethers, hydrocarbons, and crown ethers accelerates the methanol synthesis reaction.

Mahajan, Devinder (Port Jefferson, NY); Sapienza, Richard S. (Shoreham, NY); Slegeir, William A. (Hampton Bays, NY); O'Hare, Thomas E. (Huntington Station, NY)

1991-02-12T23:59:59.000Z

128

Homogeneous catalyst formulations for methanol production  

DOE Patents [OSTI]

There is disclosed synthesis of CH.sub.3 OH from carbon monoxide and hydrogen using an extremely active homogeneous catalyst for methanol synthesis directly from synthesis gas. The catalyst operates preferably between 100.degree.-150.degree. C. and preferably at 100-150 psia synthesis gas to produce methanol. Use can be made of syngas mixtures which contain considerable quantities of other gases, such as nitrogen, methane or excess hydrogen. The catalyst is composed of two components: (a) a transition metal carbonyl complex and (b) an alkoxide component. In the simplest formulation, component (a) is a complex of nickel tetracarbonyl and component (b) is methoxide (CH.sub.3 O.sup.13 ), both being dissolved in a methanol solvent system. The presence of a co-solvent such as p-dioxane, THF, polyalcohols, ethers, hydrocarbons, and crown ethers accelerates the methanol synthesis reaction.

Mahajan, Devinder (Port Jefferson, NY); Sapienza, Richard S. (Shoreham, NY); Slegeir, William A. (Hampton Bays, NY); O'Hare, Thomas E. (Huntington Station, NY)

1990-01-01T23:59:59.000Z

129

KINETICS, CATALYSIS, AND REACTION ENGINEERING Nonthermal Plasma Reactions of Dilute Nitrogen Oxide Mixtures  

E-Print Network [OSTI]

for the conversion of nitrogen oxides,1,2,4-10 sulfur dioxide,11 and volatile organic car- bons.12 Despite itsKINETICS, CATALYSIS, AND REACTION ENGINEERING Nonthermal Plasma Reactions of Dilute Nitrogen Oxide Mixtures: NOx in Nitrogen Gui-Bing Zhao, Xudong Hu, Man-Chung Yeung, Ovid A. Plumb,§ and Maciej Radosz

Yeung, Man-Chung

130

Enantioselective Organocatalytic Indole Alkylations. Design of a New and Highly Effective Chiral Amine for Iminium Catalysis  

E-Print Network [OSTI]

structural motifs of established value in medicinal chemistry or complex target synthesis. In this regard the capacity of iminium catalysis to mediate the enantioselective coupling of pyrroles and R, -unsaturated alde nucleophiles. Despite struc- tural similarities, it has long been established7 that the pyrrole -system

MacMillan, David W. C.

131

Argonne National Laboratory Chemical Engineering Division Water-gas shift catalysis  

E-Print Network [OSTI]

Argonne National Laboratory Chemical Engineering Division Water-gas shift catalysis Sara Yu Choung Engineering Division Argonne National Laboratory Hydrogen, Fuel Cells, and Infrastructure Technologies 2003 Merit Review Berkeley, CA May 19-22, 2003 #12;Argonne National Laboratory Chemical Engineering Division

132

Applied Catalysis A: General 254 (2003) 97106 Photoionization detection (PID) as a high throughput  

E-Print Network [OSTI]

Applied Catalysis A: General 254 (2003) 97­106 Photoionization detection (PID) as a high throughput 2002 Abstract A versatile photoionization detection (PID) system has been developed to rapidly screen libraries of catalytic materials. The PID approach involves the use of an appropriately selected dc

Senkan, Selim M.

133

Enzyme-Like Catalysis of the Nazarov Cyclization by Supramolecular Encapsulation  

SciTech Connect (OSTI)

A primary goal in the design and synthesis of molecular hosts has been the selective recognition and binding of a variety of guests using non-covalent interactions. Supramolecular catalysis, which is the application of such hosts towards catalysis, has much in common with many enzymatic reactions, chiefly the use of both spatially appropriate binding pockets and precisely oriented functional groups to recognize and activate specific substrate molecules. Although there are now many examples which demonstrate how selective encapsulation in a host cavity can enhance the reactivity of a bound guest, all have failed to reach the degree of increased reactivity typical of enzymes. We now report the catalysis of the Nazarov cyclization by a self-assembled coordination cage, a carbon-carbon bond-forming reaction which proceeds under mild, aqueous conditions. The acceleration in this system is over a million-fold, and represents the first example of supramolecular catalysis that achieves the level of rate enhancement comparable to that observed in several enzymes. We explain the unprecedented degree of rate increase as due to the combination of (a) preorganization of the encapsulated substrate molecule, (b) stabilization of the transition state of the cyclization by constrictive binding, and (c) increase in the basicity of the complexed alcohol functionality.

Hastings, Courtney; Pluth, Michael; Bergman, Robert; Raymond, Kenneth

2010-03-29T23:59:59.000Z

134

High-throughput metal nanoparticle catalysis by pulsed laser ablation Selim Senkan a,*, Michael Kahn a  

E-Print Network [OSTI]

High-throughput metal nanoparticle catalysis by pulsed laser ablation Selim Senkan a,*, Michael online 18 July 2006 Abstract A high-throughput pulsed laser ablation (HT-PLA) system was developed-TEM) and energy dispersive X-ray (EDX) spectroscopy, respectively. The supported nanoparticles created by HT

Senkan, Selim M.

135

Journal of Catalysis 225 (2004) 300306 www.elsevier.com/locate/jcat  

E-Print Network [OSTI]

shown that methanol can be produced by using N2O as the oxidant, rather than O2 [1­3]. More recently framework positions and ex- traframework Fe) can be used to produce methanol from CH4 and N2O. Above 523 KJournal of Catalysis 225 (2004) 300­306 www.elsevier.com/locate/jcat Methanol formation on Fe

Bell, Alexis T.

136

Catalysis Today 53 (1999) 433441 New insights into methanol synthesis catalysts from X-ray absorption  

E-Print Network [OSTI]

O and Cr2O3 mixtures and produced methanol in low yields from CO­H2 mixtures at high temperatures (593Catalysis Today 53 (1999) 433­441 New insights into methanol synthesis catalysts from X a consistent structural picture of methanol synthesis catalysts. Copper metal is the principal Cu species

Iglesia, Enrique

137

TECHNICAL STANDARDS PROGRAM TOPICAL COMMITTEES  

Broader source: Energy.gov [DOE]

PurposeThis procedure describes how topical committees are organized and recognized under the Technical Standards Program. 

138

Tensor Rank and Stochastic Entanglement Catalysis for Multipartite Pure States  

E-Print Network [OSTI]

The tensor rank (also known as generalized Schmidt rank) of multipartite pure states plays an important role in the study of entanglement classifications and transformations. We employ powerful tools from the theory of homogeneous polynomials to investigate the tensor rank of symmetric states such as the tripartite state $\\ket{W_3}=\\tfrac{1}{\\sqrt{3}}(\\ket{100}+\\ket{010}+\\ket{001})$ and its $N$-partite generalization $\\ket{W_N}$. Previous tensor rank estimates are dramatically improved and we show that (i) three copies of $\\ket{W_3}$ has rank either 15 or 16, (ii) two copies of $\\ket{W_N}$ has rank $3N-2$, and (iii) $n$ copies of $\\ket{W_N}$ has rank O(N). A remarkable consequence of these results is that certain multipartite transformations, impossible even probabilistically, can become possible when performed in multiple copy bunches or when assisted by some catalyzing state. This effect is impossible for bipartite pure states.

Lin Chen; Eric Chitambar; Runyao Duan; Zhengfeng Ji; Andreas Winter

2010-11-10T23:59:59.000Z

139

Topics In Primitive Roots  

E-Print Network [OSTI]

This monograph considers a few topics in the theory of primitive roots g(p) modulo a prime p>=2. A few estimates of the least primitive roots g(p) and the least prime primitive roots g^*(p) modulo p, a large prime, are determined. One of the estimate here seems to sharpen the Burgess estimate g(p) 0, to the smaller estimate g(p) 2. The expected order of magnitude is g(p) 1 constant. The corresponding estimates for least prime primitive roots g^*(p) are slightly higher. Anotrher topic deals with an effective lower bound #{p > x/log x for the number of primes p 1. The current results in the literature claim the lower bound #{p > x/(log x)^2, and have restrictions on the minimal number of fixed integers to three or more.

N. A. Carella

2015-01-23T23:59:59.000Z

140

Topics in String Phenomenology  

E-Print Network [OSTI]

We consider two questions in string ``phenomenology.'' First, are there any generic string predictions? Second, are there any general lessons which string theory suggests for thinking about low energy models, particularly in the framework of supersymmetry? Among the topics we consider are the squark and slepton spectrum, flavor symmetries, discrete symmetries including $CP$, and Peccei-Quinn symmetries. We also note that in some cases, discrete symmetries can be used to constrain the form of supersymmetry breaking.

Michael Dine

1993-09-23T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
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141

Collaboration Topics - Visualization | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

Simulation and Computing and Institutional R&D Programs NNSACEA Cooperation in Computer Science Collaboration Topics - Visualization Collaboration Topics - Visualization...

142

Spatial homogenization for plate-type critical assemblies. [LMFBR  

SciTech Connect (OSTI)

Standard calculational models of plate-type LMFBR critical assemblies do not explicitly represent individual plates. Instead, detailed plate-by-plate calculations are performed only for each representative cell type, and homogenized cross sections are defined by flux-volume weighting of individual plate cross sections. Subsequent reactor calculations are performed by modeling each cell type with homogenized cross sections. The homogenized cross sections are sensitive to the manner in which the cell leakage is modeled. The intent of this paper is to present a method of representing the cell leakage which results in more accurate homogenized cross sections than the methods presently in use.

Rempe, K.R.; Smith, K.S.

1983-01-01T23:59:59.000Z

143

Optimization Online - Note: Optimal non-homogeneous composites ...  

E-Print Network [OSTI]

Aug 29, 2012 ... Note: Optimal non-homogeneous composites for dynamic loading revisited. Tavakoli Rouhollah (rtavakoli ***at*** sharif.ir). Abstract: The ...

Tavakoli Rouhollah

2012-08-29T23:59:59.000Z

144

A Homogeneous Model for P0 and P? Nonlinear Complementarity ...  

E-Print Network [OSTI]

to P0 CPs starting at a positive point near the central trajectory and does not .... the trajectory induced by the homogeneous model is discussed as an essential.

2005-05-01T23:59:59.000Z

145

Towards Realization of Computational Homogenization in Practice1  

E-Print Network [OSTI]

demonstrate how to utilize ABAQUS existing facilities to develop analysis attributes required for solving homogenization technologies have been successfully verified and validated; and while industry have abandoned in

Fish, Jacob

146

Davydov's Solitons in a Homogeneous Nucleotide Chain  

E-Print Network [OSTI]

Charge transfer in homogeneous nucleotide chains is modeled on the basis of Holstein Hamiltonian. The path length of Davydov solitons in these chains is being studied. It is shown that in a dispersionless case, when the soliton velocity V is small, the path length grows exponentially as V decreases. In this case the state of a moving soliton is quasisteady. In the presence of dispersion determined by the dependence $\\Omega^2 = \\Omega_0^2 + V_0^2\\kappa^2$ \\, the path length in the region 0 V_0 the soliton motion is accompanied by emission of phonons which leads to a finite path length of a soliton. The latter tends to infinity as $V \\rightarrow V_0 + 0$ and $V \\rightarrow \\infty$. The presence of dissipation leads to a finite soliton path length. An equilibrium velocity of soliton in an external electric field is calculated. It is shown that there is a maximum intensity of an electric field at which a steady motion of a soliton is possible. The soliton mobility is calculated for the stable or ohmic brunch.

Lakhno, Victor D

2013-01-01T23:59:59.000Z

147

The roles of redox active cofactors in catalysis : structural studies of iron sulfur cluster and flavin dependent enzymes  

E-Print Network [OSTI]

Cofactors are highly prevalent in biological systems and have evolved to take on many functions in enzyme catalysis. Two cofactors, flavin adenine dinucleotide (FAD) and [4Fe-4S] clusters, were originally determined to aid ...

Goldman, Peter John

2013-01-01T23:59:59.000Z

148

administration topical: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

presented on topics as diverse as materials degredation in low Earth orbit, the Martian environment and several aspects of the still commercially dominant geostationary orbit. A...

149

adaptation research topics: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

RoomMEMORANDUM Current Topics in Accounting Research Students January 19, 2011 The syllabus. This is a course offering primarily designed for Accounting and Accounting...

150

ans topical meeting: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

automated (comput... Sandip Sen 1996-01-01 12 International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-13) N13P1395 Kanazawa City, Ishikawa Prefecture, Japan,...

151

automatic topic indexing: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

subject headings in libraries, as keywords in academic publications and as tags on the web. Knowing a documents topics helps people judge its relevance quickly. However,...

152

ARM - Topic List  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc Documentation RUC :ProductsSCM ForcingTeachersTopic List Outreach Home Room News Publications

153

Charge Transfer and Support Effects in Heterogeneous Catalysis  

SciTech Connect (OSTI)

The kinetic, electronic and spectroscopic properties of two?dimensional oxide?supported catalysts were investigated in order to understand the role of charge transfer in catalysis. Pt/TiO{sub 2} nanodiodes were fabricated and used as catalysts for hydrogen oxidation. During the reaction, the current through the diode, as well as its I?V curve, were monitored, while gas chromatography was used to measure the reaction rate. The current and the turnover rate were found to have the same temperature dependence, indicating that hydrogen oxidation leads to the non?adiabatic excitation of electrons in Pt. A fraction of these electrons have enough energy to ballistically transport through Pt and overcome the Schottky barrier at the interface with TiO{sub 2}. The yield for this phenomenon is on the order of 10{sup ?4} electrons per product molecule formed, similar to what has been observed for CO oxidation and for the adsorption of many different molecules. The same Pt/TiO{sub 2} system was used to compare currents in hydrogen oxidation and deuterium oxidation. The current through the diode under deuterium oxidation was found to be greater than under hydrogen oxidation by a factor of three. Weighted by the difference in turnover frequencies for the two isotopes, this would imply a chemicurrent yield 5 times greater for D{sub 2} compared to H{sub 2}, contrary to what is expected given the higher mass of D{sub 2}. Reversible changes in the rectification factor of the diode are observed when switching between D{sub 2} and H{sub 2}. These changes are a likely cause for the differences in current between the two isotopes. In the nanodiode experiments, surface chemistry leads to charge flow, suggesting the possibility of creating charge flow to tune surface chemistry. This was done first by exposing a Pt/Si diode to visible light while using it as a catalyst for H{sub 2} oxidation. Absorption of the light in the Si, combined with the band bending at the interface, gives rise to a steady?state flow of hot holes to the surface. This leads to a decrease in turnover on the surface, an effect which is enhanced when a reverse bias is applied to the diode. Similar experiments were carried out for CO oxidation. On Pt/Si diodes, the reaction rate was found to increase when a forward bias was applied. When the diode was exposed to visible light and a reverse bias was applied, the rate was instead decreased. This implies that a flow of negative charges to the surface increases turnover, while positive charges decrease it. Charge flow in an oxide supported metal catalyst can be modified even without designing the catalyst as a solid state electronic device. This was done by doping stoichiometric and nonstoichiometric TiO{sub 2} films with F, and using the resulting oxides as supports for Pt films. In the case of stoichiometric TiO{sub 2}, F was found to act as an n?type dopant, creating a population of filled electronic states just below the conduction band, and dramatically increasing the conductivity of the oxide film. The electrons in those states can transfer to surface O, activating it for reaction with CO, and leading to increased turnover for CO oxidation. This reinforces the hypothesis that CO oxidation is activated by a flow of negative charges to the surface. The same set of catalysts was used for methanol oxidation. The electronic properties of the TiO{sub 2} films again correlated with the turnover rates, but also with selectivity. With stoichiometric TiO{sub 2} as the support, F?doping caused an increase in selectivity toward the formation of partial oxidation products, formaldehyde and methyl formate, versus the total oxidation product, CO{sub 2}. With non?stoichiometric TiO{sub 2}, F?doping had the reverse effect. Ambient Pressure X?Ray Photoelectron Spectroscopy was used to investigate this F?doping effect in reaction conditions. In O2 alone, and in CO oxidation conditions, the O1s spectrum showed a high binding energy peak that correlated in intensity with the activity of the different films: for stoichiomet

Hervier, Antoine

2011-12-21T23:59:59.000Z

154

On the role of interfacial hydrogen bonds in "on-water" catalysis  

E-Print Network [OSTI]

Numerous experiments have demonstrated that many classes of organic reactions exhibit increased reaction rates when performed in heterogeneous water emulsions. Despite enormous practical importance of the observed "on-water" catalytic effect and several mechanistic studies, its microscopic origins remains unclear. In this work, the second generation Car-Parrinello molecular dynamics method is extended to self-consistent charge density-functional based tight-binding in order to study "on-water" catalysis of the Diels-Alder reaction between dimethyl azodicarboxylate and quadricyclane. We find that the stabilization of the transition state by dangling hydrogen bonds exposed at the aqueous interfaces plays a significantly smaller role in "on-water" catalysis than has been suggested previously.

Kristof Karhan; Rustam Z. Khaliullin; Thomas D. Kühne

2014-08-21T23:59:59.000Z

155

Major Successes of Theory-and-Experiment-Combined Studies in Surface Chemistry and Heterogeneous Catalysis.  

SciTech Connect (OSTI)

Experimental discoveries followed by theoretical interpretations that pave the way of further advances by experimentalists is a developing pattern in modern surface chemistry and catalysis. The revolution of modern surface science started with the development of surface-sensitive techniques such as LEED, XPS, AES, ISS and SIMS, in which the close collaboration between experimentalists and theorists led to the quantitative determination of surface structure and composition. The experimental discovery of the chemical activity of surface defects and the trends in the reactivity of transitional metals followed by the explanations from the theoretical studies led to the molecular level understanding of active sites in catalysis. The molecular level knowledge, in turn, provided a guide for experiments to search for new generation of catalysts. These and many other examples of successes in experiment-and-theory-combined studies demonstrate the importance of the collaboration between experimentalists and theorists in the development of modern surface science.

Somorjai, Gabor A.; Li, Yimin

2009-11-21T23:59:59.000Z

156

aloe vera gel: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

157

active polar gels: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

158

aux sols pollues: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

159

agarose gel electrophoresis: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

160

agarose gel electrophoretic: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

agar gel immunodiffusion: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

162

al sol sobre: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

163

acetate isobutyrate gels: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Description Engineering Websites Summary: , separations science, chemical catalysis and coatings science. By definition the sol-gel process starts materials. The resulting films,...

164

acc synthase expression: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 202 expression? Environments...

165

acetolactate synthase activity: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 33 Pharmacological inhibitors...

166

active stabilizer tyloxapol: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

screened for compounds containing the pharmacophore. Forty-seven compounds resulted from Marshall, Garland R. 48 Nano-Catalysis: Fibrous morphology makes the difference in...

167

activation monitoring solution: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of catalysis (Vmax). The protocol used to measure viscosity by means of a falling ball type viscometer is described, together with the determination of enzyme kinetics and the...

168

NMR Computational Studies of Solid Acidity/Fundamental Studies of Catalysis by Solid Acids  

SciTech Connect (OSTI)

This project focused on catalysis by zeolites and the synergy of spectroscopic characterization and theoretical modeling. In collaboration with the Waroquier group in Belgium we used state-of-the-art quantum chemical simulations on a supramolecular model of both the HZSM-5 zeolite and the co-catalytic hydrocarbon pool species and calculated a full catalytic cycle (including all rate constants) for methanol-to-olefin (MTO) catalysis involving a hydrocarbon pool species. This work not only represents the most robust computational analysis of a successful MTO route to date, but it also succeeds in tying together the many experimental clues. That work was featured on the cover of Angewandte Chemie. More recently we elucidated several unsuspected roles for formaldehyde in methanol to olefin catalysis. Formaldehyde proves to be a key species responsible for both the growth of the catalytically active hydrocarbon pool and its inevitable aging into deactivated polycyclic aromatic species. The apparent inevitability of formaldehyde formation at high temperatures, in particular in contact with active metal or metal oxide surfaces, may put some fundamental limitations on the economic potential of conversion of methanol to olefins.

James F. Haw

2008-06-28T23:59:59.000Z

169

At tank Low Activity Feed Homogeneity Analysis Verification  

SciTech Connect (OSTI)

This report evaluates the merit of selecting sodium, aluminum, and cesium-137 as analytes to indicate homogeneity of soluble species in low-activity waste (LAW) feed and recommends possible analytes and physical properties that could serve as rapid screening indicators for LAW feed homogeneity. The three analytes are adequate as screening indicators of soluble species homogeneity for tank waste when a mixing pump is used to thoroughly mix the waste in the waste feed staging tank and when all dissolved species are present at concentrations well below their solubility limits. If either of these conditions is violated, then the three indicators may not be sufficiently chemically representative of other waste constituents to reliably indicate homogeneity in the feed supernatant. Additional homogeneity indicators that should be considered are anions such as fluoride, sulfate, and phosphate, total organic carbon/total inorganic carbon, and total alpha to estimate the transuranic species. Physical property measurements such as gamma profiling, conductivity, specific gravity, and total suspended solids are recommended as possible at-tank methods for indicating homogeneity. Indicators of LAW feed homogeneity are needed to reduce the U.S. Department of Energy, Office of River Protection (ORP) Program's contractual risk by assuring that the waste feed is within the contractual composition and can be supplied to the waste treatment plant within the schedule requirements.

DOUGLAS, J.G.

2000-09-28T23:59:59.000Z

170

Hydrogen storage materials and method of making by dry homogenation  

DOE Patents [OSTI]

Dry homogenized metal hydrides, in particular aluminum hydride compounds, as a material for reversible hydrogen storage is provided. The reversible hydrogen storage material comprises a dry homogenized material having transition metal catalytic sites on a metal aluminum hydride compound, or mixtures of metal aluminum hydride compounds. A method of making such reversible hydrogen storage materials by dry doping is also provided and comprises the steps of dry homogenizing metal hydrides by mechanical mixing, such as be crushing or ball milling a powder, of a metal aluminum hydride with a transition metal catalyst. In another aspect of the invention, a method of powering a vehicle apparatus with the reversible hydrogen storage material is provided.

Jensen, Craig M. (Kailua, HI); Zidan, Ragaiy A. (Honolulu, HI)

2002-01-01T23:59:59.000Z

171

Markov Topic Models Chong Wang  

E-Print Network [OSTI]

. For example, papers from different scien- tific conferences and journals can be viewed as a collection the correlations of different cor- pora. MTMs capture both the internal topic structure within each corpus collection. Probabilistic topic models Part of this work was done when Chong Wang was an intern at Microsoft

Blei, David M.

172

Homogeneous vs Heterogeneous Clustered Sensor Networks: A Comparative Study  

E-Print Network [OSTI]

1 Homogeneous vs Heterogeneous Clustered Sensor Networks: A Comparative Study Vivek Mhatre elected, serve for the entire lifetime of the network) in a homoge- neous network, it is evident

Rosenberg, Catherine P.

173

Molecular Dynamics Simulation of Homogeneous Crystal Nucleation in Polyethylene  

E-Print Network [OSTI]

Using a realistic united-atom force field, molecular dynamics simulations were performed to study homogeneous nucleation of the crystal phase at about 30% supercooling from the melts of n-pentacontahectane (C150) and a ...

Yi, Peng

174

Fuel effects in homogeneous charge compression ignition (HCCI) engines  

E-Print Network [OSTI]

Homogenous-charge, compression-ignition (HCCI) combustion is a new method of burning fuel in internal combustion (IC) engines. In an HCCI engine, the fuel and air are premixed prior to combustion, like in a spark-ignition ...

Angelos, John P. (John Phillip)

2009-01-01T23:59:59.000Z

175

Continuum Electrodynamics of a Piecewise-Homogeneous Linear Medium  

E-Print Network [OSTI]

The energy--momentum tensor and the tensor continuity equation serve as the conservation laws of energy, linear momentum, and angular momentum for a continuous flow. Previously, we derived equations of motion for macroscopic electromagnetic fields in a homogeneous linear dielectric medium that is draped with a gradient-index antireflection coating (J. Math Phys. 55, 042901 (2014) ). These results are consistent with the electromagnetic tensor continuity equation in the limit that reflections and the accompanying surface forces are negligible thereby satisfying the condition of an unimpeded flow in a thermodynamically closed system. Here, we take the next step and derive equations of motion for the macroscopic fields in the limiting case of a piecewise-homogeneous simple linear dielectric medium. The presence of radiation surface forces on the interface between two different homogeneous linear materials means that the energy--momentum formalism must be modified to treat separate homogeneous media in which the ...

Crenshaw, Michael E

2015-01-01T23:59:59.000Z

176

One-Directional Perfect Cloak Created With Homogeneous Material  

E-Print Network [OSTI]

A one-directional invisibility cloak is presented in this letter. Perfect invisibility can be achieved for TM waves along certain directions. The parameters are just homogeneously anisotropic and relatively easy for practical ...

Xi, Sheng

177

Dynamics of empty homogeneous isotropic three-dimensional spaces  

E-Print Network [OSTI]

It is shown that there are seven types of solutions described in the framework of general relativity theory (GRT), the dynamics of empty homogeneous isotropic three-dimensional spaces. Solution of the equations of GRT, which describes the dynamics of a homogeneous isotropic universe, in the limiting case of vanishingly small effect of matter on the metric properties of space must go to one of them.

A. V. Klimenko; V. A. Klimenko

2012-02-28T23:59:59.000Z

178

Collaboration Topics - Meshing | National Nuclear Security Administrat...  

National Nuclear Security Administration (NNSA)

Simulation and Computing and Institutional R&D Programs NNSACEA Cooperation in Computer Science Collaboration Topics - Meshing Collaboration Topics - Meshing This work...

179

Collaboration Topics - System Software | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

Simulation and Computing and Institutional R&D Programs NNSACEA Cooperation in Computer Science Collaboration Topics - System Software Collaboration Topics - System...

180

applications topical meeting: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the ... Fox, Harold, 1979- 2004-01-01 17 International Topical Meeting on Nuclear Reactor Thermal -Hydraulics, NURETH-15 NURETH15-491 Pisa, Italy, May 12-17, 2013 Fission and...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Homogeneous blue pattern: A rare presentation in an acral congenital melanocytic nevus  

E-Print Network [OSTI]

Malvehy J. Homogeneous blue pattern in an acral congenitalof a plantar combined blue nevus: a simulator of melanoma.Homogeneous blue pattern: A rare presentation in an acral

2010-01-01T23:59:59.000Z

182

Variable valve timing in a homogenous charge compression ignition engine  

DOE Patents [OSTI]

The present invention relates generally to the field of homogenous charge compression ignition engines, in which fuel is injected when the cylinder piston is relatively close to the bottom dead center position for its compression stroke. The fuel mixes with air in the cylinder during the compression stroke to create a relatively lean homogeneous mixture that preferably ignites when the piston is relatively close to the top dead center position. However, if the ignition event occurs either earlier or later than desired, lowered performance, engine misfire, or even engine damage, can result. The present invention utilizes internal exhaust gas recirculation and/or compression ratio control to control the timing of ignition events and combustion duration in homogeneous charge compression ignition engines. Thus, at least one electro-hydraulic assist actuator is provided that is capable of mechanically engaging at least one cam actuated intake and/or exhaust valve.

Lawrence, Keith E.; Faletti, James J.; Funke, Steven J.; Maloney, Ronald P.

2004-08-03T23:59:59.000Z

183

On the Mechanical Interaction of Light With Homogeneous Liquids  

E-Print Network [OSTI]

We investigate one of the consequences of the three competing models describing the mechanical interaction of light with a dielectric medium. According to both the Abraham and Minkowski models the time-averaged force density is zero inside a homogeneous dielectric, whereas the induced-current Lorentz force model predicts a non-zero force density. We argue that the latter force, if exists, could drive a hydrodynamic flow inside a homogeneous fluid. Our numerical experiments show that such flows have distinct spatial patterns and may influence the dynamics of particles in a water-based single-beam optical trap.

de Reus, Michiel

2013-01-01T23:59:59.000Z

184

Proton Mediated Chemistry and Catalysis in a Self-Assembled Supramolecular Host  

SciTech Connect (OSTI)

Synthetic supramolecular host assemblies can impart unique reactivity to encapsulated guest molecules. Synthetic host molecules have been developed to carry out complex reactions within their cavities, despite the fact that they lack the type of specifically tailored functional groups normally located in the analogous active sites of enzymes. Over the past decade, the Raymond group has developed a series of self-assembled supramolecules and the Bergman group has developed and studied a number of catalytic transformations. In this Account, we detail recent collaborative work between these two groups, focusing on chemical catalysis stemming from the encapsulation of protonated guests and expanding to acid catalysis in basic solution. We initially investigated the ability of a water-soluble, self-assembled supramolecular host molecule to encapsulate protonated guests in its hydrophobic core. Our study of encapsulated protonated amines revealed rich host-guest chemistry. We established that self-exchange (that is, in-out guest movement) rates of protonated amines were dependent on the steric bulk of the amine rather than its basicity. The host molecule has purely rotational tetrahedral (T) symmetry, so guests with geminal N-methyl groups (and their attendant mirror plane) were effectively desymmetrized; this allowed for the observation and quantification of the barriers for nitrogen inversion followed by bond rotation. Furthermore, small nitrogen heterocycles, such as N-alkylaziridines, N-alkylazetidines, and N-alkylpyrrolidines, were found to be encapsulated as proton-bound homodimers or homotrimers. We further investigated the thermodynamic stabilization of protonated amines, showing that encapsulation makes the amines more basic in the cavity. Encapsulation raises the effective basicity of protonated amines by up to 4.5 pK{sub a} units, a difference almost as large as that between the moderate and strong bases carbonate and hydroxide. The thermodynamic stabilization of protonated guests was translated into chemical catalysis by taking advantage of the potential for accelerating reactions that take place via positively charged transition states, which could be potentially stabilized by encapsulation. Orthoformates, generally stable in neutral or basic solution, were found to be suitable substrates for catalytic hydrolysis by the assembly. Orthoformates small enough to undergo encapsulation were readily hydrolyzed by the assembly in basic solution, with rate acceleration factors up to 3900 compared with those of the corresponding uncatalyzed reactions. Furthering the analogy to enzymes that obey Michaelis-Menten kinetics, we observed competitive inhibition with the inhibitor NPr{sub 4}{sup +}, thereby confirming that the interior cavity of the assembly was the active site for catalysis. Mechanistic studies revealed that the assembly is required for catalysis and that the rate-limiting step of the reaction involves proton transfer from hydronium to the encapsulated substrate. Encapsulation in the assembly changes the orthoformate hydrolysis from an A-1 mechanism (in which decomposition of the protonated substrate is the rate-limiting step) to an A-S{sub E}2 mechanism (in which proton transfer is the rate-limiting step). The study of hydrolysis in the assembly was next extended to acetals, which were also catalytically hydrolyzed by the assembly in basic solution. Acetal hydrolysis changed from the A-1 mechanism in solution to an A-2 mechanism inside the assembly, where attack of water on the protonated substrate is rate limiting. This work provides rare examples of assembly-catalyzed reactions that proceed with substantial rate accelerations despite the absence of functional groups in the cavity and with mechanisms fully elucidated by quantitative kinetic studies.

Pluth, Michael; Bergman, Robert; Raymond, Kenneth

2009-04-10T23:59:59.000Z

185

Homogenization of the criticality spectral equation in neutron transport  

E-Print Network [OSTI]

for the neutron transport equation in a periodic heterogeneous domain, modeling the criticality study of nuclearHomogenization of the criticality spectral equation in neutron transport Gr'egoire Allaire \\Lambda problem. This result justifies and improves the engineering procedure used in practice for nuclear reactor

Bal, Guillaume

186

A CHARACTERIZATION OF HOMOGENEOUS SPACES WITH POSITIVE HYPERBOLIC RANK  

E-Print Network [OSTI]

A CHARACTERIZATION OF HOMOGENEOUS SPACES WITH POSITIVE HYPERBOLIC RANK CHRISTOPHER CONNELL Abstract to be a rank one symmetric space. In particular, we show rigidity if such a space has positive hyperbolic rank greater than equal to that of its "abelian direction." The notion of hyperbolic-rank extends the notion

Connell, Christopher

187

Homogeneous Charge Compression Ignition: Formulation Effect of a Diesel Fuel  

E-Print Network [OSTI]

Homogeneous Charge Compression Ignition: Formulation Effect of a Diesel Fuel on the Initiation and the Combustion Potential of Olefin Impact in a Diesel Base Fuel D. Alseda1,2, X. Montagne1 and P. Dagaut2 1 Compression Ignition: Formulation Effect of a Diesel Fuel on the Initiation and the Combustion - Potential

Paris-Sud XI, Université de

188

Homogenized Maxwell's Equations; a Model for Varistor Ceramics  

E-Print Network [OSTI]

from [3] of the electric field as a function of the current density for Zinc Oxide, ZnHomogenized Maxwell's Equations; a Model for Varistor Ceramics Bj¨orn Birnir Niklas Wellander and lower bounds are obtained for the effective conductivity in the varistor. These two bounds

Birnir, Björn

189

Homogenized Maxwell's Equations; a Model for Varistor Ceramics  

E-Print Network [OSTI]

from [3] of the electric field as a function of the current density for Zinc Oxide, ZnHomogenized Maxwell's Equations; a Model for Varistor Ceramics BjË? orn Birnir Niklas Wellander and lower bounds are obtained for the effective conductivity in the varistor. These two bounds

Birnir, Björn

190

Hopf Bifurcation and Oscillations in Homogeneous Communication Networks  

E-Print Network [OSTI]

Hopf Bifurcation and Oscillations in Homogeneous Communication Networks Huibing Yin Paul Wang and Engineering, University of Illinois at Urbana-Champaign, 1206 W. Green Street, Urbana, IL 61801. yin3,paulwang: In this paper, we investigate stability and bifurcation arising in a communication network model with a large

Alpcan, Tansu

191

HOMOGENEOUS MODELS IN GENERAL RELATIVITY AND GAS DYNAMICS  

E-Print Network [OSTI]

HOMOGENEOUS MODELS IN GENERAL RELATIVITY AND GAS DYNAMICS O. I. BOGOYAVLENSKII AND S. P. NOVIKOV analytically) in general relativity and gas dynamics. The investigation of these models is carried out begins with a short survey of results on non-trivial models (that is, those that are not integrable

Novikov, Sergei Petrovich

192

MESOSCALE MODELLING OF WIND ENERGY OVER NON-HOMOGENEOUS TERRAIN  

E-Print Network [OSTI]

MESOSCALE MODELLING OF WIND ENERGY OVER NON-HOMOGENEOUS TERRAIN (ReviewArticle) Y. MAHRER.1. OBSERVATIONALAPPROACHES Evaluations of wind energy based on wind observations (usually surface winds) at well, the resolution of the wind energy pattern throughout an extended area by this methodology requires a large number

Pielke, Roger A.

193

Anisotropic Homogeneous Cosmologies in the Post-Newtonian Approximation  

E-Print Network [OSTI]

In this paper we explore how far the post-Newtonian theory goes in overcoming the difficulties associated with anisotropic homogeneous cosmologies in the Newtonian approximation. It will be shown that, unlike in the Newtonian case, the cosmological equations of the post-Newtonian approximation are much more in the spirit of general relativity with regard to the nine Bianchi types and issues of singularities. The situations of vanishing rotation and vanishing shear are treated separately. The homogeneous Bianchi I model is considered as an example of a rotation-free cosmology with anisotropy. It is found in the Newtonian approximation that there are arbitrary functions that need to be given for all time if the initial value problem is to be well-posed, while in the post-Newtonian case there is no such need. For the general case of a perfect fluid only the post-Newtonian theory can satisfactorily describe the effects of pressure. This is in accordance with findings in an earlier paper where the post-Newtonian approximation was applied to homogeneous cosmologies. For a shear-free anisotropic homogeneous cosmology the Newtonian theory of Heckmann and Sch\\"ucking is explored. Comparisons with its relativistic and post-Newtonian counterparts are made. In the Newtonian theory solutions exist to which there are no analogues in general relativity. The post-Newtonian approximation may provide a way out.

Tamath Rainsford

2000-07-23T23:59:59.000Z

194

Forensic Tracking and Surveillance Algorithms for Homogeneous and Heterogeneous Settings  

E-Print Network [OSTI]

Forensic Tracking and Surveillance Algorithms for Homogeneous and Heterogeneous Settings Submitted-Kuwari) Date: #12;"I cannot succeed except through God" #12;Abstract Digital forensics is an emerging field. Traditionally, digital forensics has been confined to the extraction of digital evidence from electronic devices

Sheldon, Nathan D.

195

Decarboxylative Arylation of Amino Acids via Photoredox Catalysis: A One-Step Conversion of Biomass to Drug  

E-Print Network [OSTI]

Decarboxylative Arylation of Amino Acids via Photoredox Catalysis: A One-Step Conversion of Biomass. This method offers rapid entry to prevalent benzylic amine architectures from an abundant biomass the worldwide abundance of biomass6 that incorporates carboxylate functionality (e.g., amino acids, -hydroxy

MacMillan, David W. C.

196

Conformationally controlled pK-switching in membrane proteins: One more mechanism specic to the enzyme catalysis?  

E-Print Network [OSTI]

-active tyrosine YZ in the oxygen- evolving photosystem II. It is conceivable that YZ switches its pK from VV4 to general mechanisms of enzymatic catalysis. In the bacterial photosyn- thetic reaction center (RC transfer; Photosynthetic reaction center; Bacteriorhodopsin; Photosystem II 1. Introduction The nature

Steinhoff, Heinz-Jürgen

197

Channeling of Fusion Alpha-Particle Power Using Minority Ion Catalysis A. I. Zhmoginov and N. J. Fisch  

E-Print Network [OSTI]

, with electrons kept cold, so that the effective fusion reactivity can be increased [9­11]. The meansChanneling of Fusion Alpha-Particle Power Using Minority Ion Catalysis A. I. Zhmoginov and N. J greatly facilitate controlled nuclear fusion. The parameter range for achieving this temperature disparity

198

Effects of catalysis on particle motion in plane-parallel and cylindrical channels in a catalytic reactor  

SciTech Connect (OSTI)

A theoretical study is made on aerosol behavior in a catalysis zone for a plane-parallel or cylindrical channel in a catalytic reactor. It is found that the thermophoretic trapping coefficient may attain 10-15% in a laminar flow having longitudinal Pe and Re >> 1 even for small relative temperature differences.

Kabanov, A.N.; Murashkevich, F.I.; Shulimanova, Z.L.; Shukin, E.R.

1987-09-01T23:59:59.000Z

199

General basic and coordination catalysis in reactions of haloaromatic compounds with ammonia in the presence of copper(I) compounds  

SciTech Connect (OSTI)

This paper presents a study made to detect general basic catalysis by ammonia (reagent) in reactions of ammonolysis of haloaromatic compounds in the presence of Cu/sup +/ ions, as well as to determine the generality of the mechanisms of the catalytic replacement of a halogen atom by an amino group in the anthraquinone and benzene series.

Chumak, V.T.; Shein, S.M.

1985-11-01T23:59:59.000Z

200

Catalysis Workshop  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed New Substation Sites ProposedOccupational Health Services >

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Design, Synthesis and Mechanistic Evaluation of Iron-Based Catalysis for Synthesis Gas Conversion to Fuels and Chemicals  

SciTech Connect (OSTI)

This project extends previously discovered Fe-based catalysts to hydrogen-poor synthesis gas streams derived from coal and biomass sources. These catalysts have shown unprecedented Fischer-Tropsch synthesis rates and selectivities for synthesis gas derived from methane. During the first reporting period, we certified a microreactor, installed required analytical equipment, and reproduced synthetic protocols and catalytic results previously reported. During the second reporting period, we prepared several Fe-based compositions for Fischer-Tropsch Synthesis and tested the effects of product recycle under both subcritical and supercritical conditions. During the third and fourth reporting periods, we improved the catalysts preparation method, which led to Fe-based materials with the highest FTS reaction rates and selectivities so far reported, a finding that allowed their operation at lower temperatures and pressures with high selectivity to desired products (C{sub 5+}, olefins). During the fifth and sixth reporting period, we studied the effects of different promoters on catalytic performance, specifically how their sequence of addition dramatically influenced the performance of these materials in the Fischer-Tropsch synthesis. We also continued our studies of the kinetic behavior of these materials during the sixth reporting period. Specifically, the effects of H{sub 2}, CO, and CO{sub 2} on the rates and selectivities of Fischer-Tropsch Synthesis reactions led us to propose a new sequence of elementary steps on Fe and Co Fischer-Tropsch catalysts. Finally, we also started a study of the use of colloidal precipitation methods for the synthesis small Co clusters using recently developed methods to explore possible further improvements in FTS rates and selectivities. We found that colloidal synthesis makes possible the preparation of small cobalt particles, although large amount of cobalt silicate species, which are difficult to reduce, were formed. During this seventh reporting period, we have explored several methods to modify the silanol groups on SiO{sub 2} by using either a homogeneous deposition-precipitation method or surface titration of Si-OH on SiO{sub 2} with zirconium (IV) ethoxide to prevent the formation of unreducible and unreactive CoO{sub x} species during synthesis and FTS catalysis. We have synthesized monometallic Co/ZrO{sub 2}/SiO{sub 2} catalysts with different Co loadings (11-20 wt%) by incipient wetness impregnation methods and characterized the prepared Co supported catalysts by H{sub 2} temperature-programmed reduction (H{sub 2}-TPR) and H{sub 2}-chemisorption. We have measured the catalytic performance in FTS reactions and shown that although the hydroxyl groups on the SiO{sub 2} surface are difficult to be fully titrated by ZrO{sub 2}, modification of ZrO{sub 2} on SiO{sub 2} surface can improve the Co clusters dispersion and lead to a larger number of exposed Co surface atoms after reduction and during FTS reactions. During this seventh reporting period, we have also advanced our development of the reaction mechanism proposed in the previous reporting period. Specifically, we have shown that our novel proposal for the pathways involved in CO activation on Fe and Co catalysts is consistent with state-of-the-art theoretical calculations carried out in collaboration with Prof. Manos Mavrikakis (University of Wisconsin-Madison). Finally, we have also worked on the preparation of several manuscripts describing our findings about the preparation, activation and mechanism of the FTS with Fe-based catalysts and we have started redacting the final report for this project.

Akio Ishikawa; Manuel Ojeda; Nan Yao; Enrique Iglesia

2007-03-31T23:59:59.000Z

202

Asymmetry of rotational catalysis of single membrane-bound F0F1-ATP synthase  

E-Print Network [OSTI]

Synthesis of the cellular 'energy currency' ATP is catalyzed by membrane-bound F0F1-ATP synthases. The chemical reaction at three binding sites in the F1 part is coupled to proton translocation through the membrane-integrated F0 part by an internal rotation of subunits. We examined the rotary movements of the epsilon-subunit of the 'rotor' with respect to the b-subunits of the 'stator' by single-molecule fluorescence resonance energy transfer (FRET). Rotation of epsilon during ATP hydrolysis is divided into three major steps with constant FRET level corresponding to three binding sites. Different catalytic activities of the individual binding sites were observed depending on the relative orientation of the 'rotor'. Computer simulations of the FRET signals and non-equally distributed orientations of epsilon strongly corroborate asymmetry of catalysis in F0F1-ATP synthase.

Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael

2007-01-01T23:59:59.000Z

203

Protein conformational dynamics in the mechanism of HIV-1 protease catalysis  

SciTech Connect (OSTI)

We have used chemical protein synthesis and advanced physical methods to probe dynamics-function correlations for the HIV-1 protease, an enzyme that has received considerable attention as a target for the treatment of AIDS. Chemical synthesis was used to prepare a series of unique analogues of the HIV-1 protease in which the flexibility of the 'flap' structures (residues 37-61 in each monomer of the homodimeric protein molecule) was systematically varied. These analogue enzymes were further studied by X-ray crystallography, NMR relaxation, and pulse-EPR methods, in conjunction with molecular dynamics simulations. We show that conformational isomerization in the flaps is correlated with structural reorganization of residues in the active site, and that it is preorganization of the active site that is a rate-limiting factor in catalysis.

Torbeev, Vladimir Yu.; Raghuraman, H.; Hamelberg, Donald; Tonelli, Marco; Westler, William M.; Perozo, Eduardo; Kent, Stephen B.H. (GSU); (UW); (UC)

2013-09-17T23:59:59.000Z

204

Methane Oxidation to Methanol without CO2 Emission: Catalysis by Atomic Negative Ions  

E-Print Network [OSTI]

The catalytic activities of the atomic Y-, Ru-, At-, In-, Pd-, Ag-, Pt-, and Os- ions have been investigated theoretically using the atomic Au- ion as the benchmark for the selective partial oxidation of methane to methanol without CO2 emission. Dispersion-corrected density-functional theory has been used for the investigation. From the energy barrier calculations and the thermodynamics of the reactions, we conclude that the catalytic effect of the atomic Ag-, At-, Ru-, and Os- ions is higher than that of the atomic Au- ion catalysis of CH4 conversion to methanol. By controlling the temperature around 290K (Os-), 300K (Ag-), 310K (At-), 320K (Ru-) and 325K (Au-) methane can be completely oxidized to methanol without the emission of CO2. We conclude by recommending the investigation of the catalytic activities of combinations of the above negative ions for significant enhancement of the selective partial oxidation of methane to methanol.

Tesfamichael, Aron; Felfli, Zineb; Msezane, Alfred Z

2014-01-01T23:59:59.000Z

205

Apparatus for unilateral generation of a homogeneous magnetic field  

DOE Patents [OSTI]

An apparatus for unilaterally producing a substantially homogeneous magnetic field. The apparatus includes two circular electromagnet coils, a small coil and a large coil, which are coaxial with one another and which are separated by a distance equal to one-half the difference in the radius of the two coils. By appropriate selection of electrical currents, which are passed through the coil in opposite directions, a region of homogeneous magnetic field is formed. This region is centered on the common axis of the two coils, at a point on the axis which is at a distance from the small coil equal to one-half the radius of the small coil, and which is on the opposite side of the small coil from the large coil. The apparatus has particular application in the field of diagnostic medical NMR and other NMR applications.

Fukushima, Eiichi (Los Alamos, NM); Rath, Alan R. (San Diego, CA); Roeder, Stephen B. W. (La Mesa, CA)

1988-01-01T23:59:59.000Z

206

Apparatus for unilateral generation of a homogeneous magnetic field  

DOE Patents [OSTI]

An apparatus for unilaterally producing a substantially homogeneous magnetic field. The apparatus includes two circular electromagnet coils, a small coil and a large coil, which are coaxial with one another and which are separated by a distance equal to one-half the difference in the radius of the two coils. By appropriate selection of electrical currents, which are passed through the coils in opposite directions, a region of homogeneous magnetic field is formed. This region is centered on the common axis of the two coils, at a point on the axis which is at a distance from the small coil equal to one-half the radius of the small coil, and which is on the opposite side of the small coil from the large coil. The apparatus has particular application in the field of diagnostic medical NMR and other NMR applications.

Fukushima, E.; Rath, A.R.; Roeder, S.B.W.

1984-05-01T23:59:59.000Z

207

acc synthase gene: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 211 Reverse engineering a...

208

arabidopsis spermidine synthase: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 217 Reverse engineering a...

209

acid synthase fasii: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 87 Reverse engineering a...

210

acid synthase ii: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 131 Reverse engineering a...

211

acid synthase gene: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 169 Reverse engineering a...

212

acetolactase synthase inhibitor: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 94 Reverse engineering a...

213

acetolactate synthase inhibitor: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 98 Reverse engineering a...

214

acetolactate synthase inhibitors: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 98 Reverse engineering a...

215

acid 8-phosphate synthase: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 87 Reverse engineering a...

216

acetolactate synthase genes: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 102 Reverse engineering a...

217

automatic f0 stylisation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 88 ROBUST SPEECH END-POINT...

218

acetohydroxy acid synthase: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 87 Reverse engineering a...

219

acetyl coa synthase: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 140 Reverse engineering a...

220

acid synthase depends: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

corroborate asymmetry of catalysis in F0F1-ATP synthase. Zarrabi, Nawid; Diez, Manuel; Graeber, Peter; Wrachtrup, Joerg; Boersch, Michael 2007-01-01 56 Phosphorylation of Yeast...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

High load operation in a homogeneous charge compression ignition engine  

DOE Patents [OSTI]

A homogeneous charge compression ignition engine is set up by first identifying combinations of compression ratio and exhaust gas percentages for each speed and load across the engines operating range. These identified ratios and exhaust gas percentages can then be converted into geometric compression ratio controller settings and exhaust gas recirculation rate controller settings that are mapped against speed and load, and made available to the electronic

Duffy, Kevin P. (Metamora, IL); Kieser, Andrew J. (Morton, IL); Liechty, Michael P. (Chillicothe, IL); Hardy, William L. (Peoria, IL); Rodman, Anthony (Chillicothe, IL); Hergart, Carl-Anders (Peoria, IL)

2008-12-23T23:59:59.000Z

222

Major research topics in combustion  

SciTech Connect (OSTI)

The Institute for Computer Applications in Science and Engineering (ICASE) and NASA Langley Research Center (LaRC) hosted a workshop on October 2--4, 1989 to discuss some combustion problems of technological interest to LaRC and to foster interaction with the academic community in these research areas. The topics chosen for this purpose were flame structure, flame holding/extinction, chemical kinetics, turbulence-kinetics interaction, transition to detonation, and reacting free shear layers. This document contains the papers and edited versions of general discussions on these topics. The lead paper set the stage for the meeting by discussing the status and issues of supersonic combustion relevant to the scramjet engine. Experts were then called upon to review the current knowledge in the aforementioned areas, to focus on how this knowledge can be extended and applied to high-speed combustion, and to suggest future directions of research in these areas.

Hussaini, M.Y.; Kumar, A.; Voigt, R.G. (eds.)

1992-01-01T23:59:59.000Z

223

attenuates methamphetamine-induced overexpression: Topics by...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and borehole acoustic models. The validity of the scheme is established using a 3D homogenous isotropic ... Krasovec, Mary L. 2003-01-01 25 1997 Cancer Research...

224

Homogenized dynamic constitutive relation for Bloch-wave propagation in periodic composites: structure and symmetries  

E-Print Network [OSTI]

Homogenized dynamic constitutive relation for Bloch-wave propagation in periodic composites composites has been made only very recently. Here we discuss the explicit form of the effective dynamic properties of composites with tailored microstructure necessitates a systematic homogenization procedure

Nemat-Nasser, Sia

225

Controlling And Operating Homogeneous Charge Compression Ignition (Hcci) Engines  

DOE Patents [OSTI]

A Homogeneous Charge Compression Ignition (HCCI) engine system includes an engine that produces exhaust gas. A vaporization means vaporizes fuel for the engine an air induction means provides air for the engine. An exhaust gas recirculation means recirculates the exhaust gas. A blending means blends the vaporized fuel, the exhaust gas, and the air. An induction means inducts the blended vaporized fuel, exhaust gas, and air into the engine. A control means controls the blending of the vaporized fuel, the exhaust gas, and the air and for controls the inducting the blended vaporized fuel, exhaust gas, and air into the engine.

Flowers, Daniel L. (San Leandro, CA)

2005-08-02T23:59:59.000Z

226

Homogeneous Charge Compression Ignition Free Piston Linear Alternator  

SciTech Connect (OSTI)

An experimental and theoretical investigation of a homogeneous charge compression ignition (HCCI) free piston powered linear alternator has been conducted to determine if improvements can be made in the thermal and conversion efficiencies of modern electrical generator systems. Performance of a free piston engine was investigated using a rapid compression expansion machine and a full cycle thermodynamic model. Linear alternator performance was investigated with a computer model. In addition linear alternator testing and permanent magnet characterization hardware were developed. The development of the two-stroke cycle scavenging process has begun.

Janson Wu; Nicholas Paradiso; Peter Van Blarigan; Scott Goldsborough

1998-11-01T23:59:59.000Z

227

Exhaust gas recirculation in a homogeneous charge compression ignition engine  

DOE Patents [OSTI]

A homogeneous charge compression ignition engine operates by injecting liquid fuel directly in a combustion chamber, and mixing the fuel with recirculated exhaust and fresh air through an auto ignition condition of the fuel. The engine includes at least one turbocharger for extracting energy from the engine exhaust and using that energy to boost intake pressure of recirculated exhaust gas and fresh air. Elevated proportions of exhaust gas recirculated to the engine are attained by throttling the fresh air inlet supply. These elevated exhaust gas recirculation rates allow the HCCI engine to be operated at higher speeds and loads rendering the HCCI engine a more viable alternative to a conventional diesel engine.

Duffy, Kevin P. (Metamora, IL); Kieser, Andrew J. (Morton, IL); Rodman, Anthony (Chillicothe, IL); Liechty, Michael P. (Chillicothe, IL); Hergart, Carl-Anders (Peoria, IL); Hardy, William L. (Peoria, IL)

2008-05-27T23:59:59.000Z

228

Lack of energy equipartition in homogeneous heated binary granular mixtures  

E-Print Network [OSTI]

We consider the problem of determining the granular temperatures of the components of a homogeneous binary heated mixture of inelastic hard spheres, in the framework of Enskog kinetic theory. Equations are derived for the temperatures of each species and their ratio, which is different from unity, as may be expected since the system is out of equilibrium. We focus on the particular heating mechanism where the inelastic energy loss is compensated by an injection through a random external force (``stochastic thermostat''). The influence of various parameters and their possible experimental relevance is discussed.

A. Barrat; E. Trizac

2002-05-21T23:59:59.000Z

229

A study of non-homogeneous absorbing Markov chains  

E-Print Network [OSTI]

the properties of p as related to the product of matrices. Lemma 1. Suppose A , A , . . . , A is a sequence of matrices with n-1 V(A ) & 0 for all k. Then, A . . . A A & 0. n ? 1 '' 2 1 Proof. Let A & 0 be a matrix such that p(A) & 0. For any column n... result k concerning the existence of lim A , where A is the transition matrix k~ of the Narkov chain. This result is generalized into a non-homogeneous Markov chain setting by allowing the transition matrix A to change at each step of time. This leads...

Bean, John Kevin

1975-01-01T23:59:59.000Z

230

Mesoporous Silica Nanomaterials for Applications in Catalysis, Sensing, Drug Delivery and Gene Transfection  

SciTech Connect (OSTI)

The central theme of this dissertation is represented by the versatility of mesoporous silica nanomaterials in various applications such as catalysis and bio-applications, with main focus on biological applications of Mesoporous Silica Nanospheres (MSN). The metamorphosis that we impose to these materials from catalysis to sensing and to drug and gene delivery is detailed in this dissertation. First, we developed a synthetic method that can fine tune the amount of chemically accessible organic functional groups on the pores surface of MSN by exploiting electrostatic and size matching between the cationic alkylammonium head group of the cetyltrimethylammonium bromide (CTAB) surfactant and various anionic organoalkoxysilane precursors at the micelle-water interface in a base-catalyzed condensation reaction of silicate. Aiming nature imitation, we demonstrated the catalytic abilities of the MSNs, We utilized an ethylenediamine functional group for chelating Cu{sup 2+} as a catalytic functional group anchored inside the mesopores. Thus, a polyalkynylene-based conducting polymer (molecular wire) was synthesized within the Cu-functionalized MSNs silica catalyst. For sensing applications, we have synthesized a poly(lactic acid) coated mesoporous silica nanosphere (PLA-MSN) material that serves as a fluorescence sensor system for detection of amino-containing neurotransmitters in neutral aqueous buffer. We exploited the mesoporosity of MSNs for encapsulating pharmaceutical drugs. We examined bio-friendly capping molecules such as polyamidoamine dendrimers of generations G2 to G4, to prevent the drug leaching. Next, the drug delivery system employed MSNs loaded with Doxorubicin, an anticancer drug. The results demonstrated that these nano-Trojan horses have ability to deliver Doxorubicin to cancer cells and induce their death. Finally, to demonstrate the potential of MSN as an universal cellular transmembrane nanovehicle, we anchored positively charged dendrimers on the surface of MSN and utilize them to complex cationic DNA. The p-EGFP-CI gene-coated MSN nanocomposite was able to transfect cancer cell lines, such as human HeLa and CHO cancer cell lines. The gene carrier ability of MSNs was further proved by transfecting primary cells and cotransfecting of two different genes in cancer cell lines. In sum, MSN are versatile partners in several types of applications.

Daniela Rodica Radu

2005-12-19T23:59:59.000Z

231

Chemical Homogeneity in Collinder 261 and Implications for Chemical Tagging  

E-Print Network [OSTI]

This paper presents abundances for 12 red giants of the old open cluster Collinder 261 based on spectra from VLT/UVES. Abundances were derived for Na, Mg, Si, Ca, Mn, Fe, Ni, Zr and Ba. We find the cluster has a solar-level metallicity of [Fe/H] = -0.03 dex. However some alpha elements were found to be enhanced. The star-to-star scatter was consistent with the expected measurement uncertainty for all elements. The observed rms scatter is as follows: Na = 0.07, Mg = 0.05, Si = 0.06, Ca = 0.05, Mn = 0.03, Fe = 0.02, Ni = 0.04, Zr = 0.12, and Ba = 0.03 dex. The intrinsic scatter was estimated to be less than 0.05 dex. Such high levels of homogeneity indicate that chemical information remains preserved in this old open cluster. We use the chemical homogeneity we have now established in Cr 261, Hyades and the HR1614 moving group to examine the uniqueness of the individual cluster abundance patterns, ie. chemical signatures. We demonstrate that the three studied clusters have unique chemical signatures, and discuss how other such signatures may be searched for in the future. Our findings support the prospect of chemically tagging disk stars to common formation sites in order to unravel the dissipative history of the Galactic disk.

G. M. De Silva; K. C. Freeman; M. Asplund; J. Bland-Hawthorn; M. S. Bessell; R. Collet

2006-11-28T23:59:59.000Z

232

The moduli space of local homogeneous 3-geometries  

E-Print Network [OSTI]

For a canonical formulation of quantum gravity, the superspace of all possible 3-geometries on a Cauchy hypersurface of a 3+1-dimensional Lorentzian manifold plays a key role. While in the analogous 2+1-dimensional case the superspace of all Riemannian 2-geometries is well known, the structure of the superspace of all Riemannian 3-geometries has not yet been resolved at present. In this paper, an important subspace of the latter is disentangled: The superspace of local homogenous Riemannian 3-geometries. It is finite dimensional and can be factored by conformal scale dilations, with the flat space as the center of projection. The corresponding moduli space can be represented by homothetically normalized 3-geometries. By construction, this moduli space of the local homogenous 3-geometries is an algebraic variety. An explicit parametrization is given by characteristic scalar invariants of the Riemannian 3-geometry. Although the moduli space is not locally Euclidean, it is a Hausdorff space. Nevertheless, its topology is compatible with the non-Hausdorffian topology of the space of all Bianchi-Lie algebras, which characterize the moduli modulo differences in their anisotropy.

M. Rainer

1996-07-26T23:59:59.000Z

233

Innovative Topics for Advanced Biofuels  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:Year in3.pdfEnergy Health andofIan Kalin About UsIndustrialofAlgae!Innovative Topics for

234

Catalysis and clean environment: What do these two have in common?  

SciTech Connect (OSTI)

The theme of the 1990s, ``Continual Expansion through Sustainable Development,`` is the outcome of interdisciplinary studies undertaken in the preceding two decades to arrest ongoing global environmental deterioration. A critical component of various international efforts to formulate and implement environmentally-sound technologies is the planned involvement of developing countries and countries with economies in-transition which are poised for explosive growth well into the twenty-first century but do not have policies or financial resources to simultaneously manage their environment. Though CO{sub 2}-producing, technologies utilizing relatively abundant and inexpensive carbon-based feedstocks will still play a major role on the scene. Related to this, the aim of the ongoing effort at Brookhaven National Laboratory is to develop technologies for enhancing natural gas and coal usage through liquid phase catalysis. A successful application of this concept in the synthesis of oxygenates is described. The potential impact of this activity on methanol-energy, non-petroleum feedstocks development, H{sub 2}-energy, CO{sub 2}-recycle, and several other areas in relation to CO{sub 2}-mitigation, is also discussed.

Mahajan, D.; Gupta, N.; Kobayashi, A.

1993-07-01T23:59:59.000Z

235

DFT calculations of EPR parameters of transition metal complexes: Implications for catalysis  

SciTech Connect (OSTI)

Transition metal and ligand hyperfine coupling constants for paramagnetic vanadium and copper model complexes have been calculated using DFT methods that are available in commercial software packages. Variations in EPR parameters with ligand identity and ligand orientation are two of the trends that have been investigated with DFT calculations. For example, the systematic variation of the vanadium hyperfine coupling constant with orientation for an imidazole ligand in a VO2+ complex has been observed experimentally and has also been reproduced by DFT calculations. Similarly, changes in the vanadium hyperfine coupling constant with ligand binding have been calculated using model complexes and DFT methods. DFT methods were also used to calculate ligand hyperfine coupling constants in transition metal systems. The variation of the proton hyperfine coupling constant with water ligand orientation was investigated for [VO(H2O)5]2+ and the results were used to interpret high resolution EPR data of VO2+-exchanged zeolites. Nitrogen hyperfine and quadrupole coupling constants for VO2+ model complexes were calculated and compared with experimental data. The computational results were used to enhance the interpretation of the EPR data for vanadium-exchanged zeolites which are promising catalytic materials. The implications of the DFT calculations of EPR parameters with respect to catalysis will be discussed

Saladino, Alexander C.; Larsen, Sarah C.

2005-07-15T23:59:59.000Z

236

Steam catalysis in CaO carbonation under low steam partial pressure  

SciTech Connect (OSTI)

CaO was widely used to capture CO{sub 2} in direct hydrogen production process, where steam always existed simultaneously. The effect of steam on CaO carbonation performance under low steam partial pressure was investigated using a pressurized thermogravimetric apparatus. The experimental results revealed that steam improved CaO carbonation performance significantly no matter whether Ca(OH){sub 2} was produced or not. At 823 K and 0.5 MPa of steam partial pressure, effect of steam on CaO carbonation performance could not be attributed mainly to production of Ca(OH){sub 2} because the hydration rate of CaO was very slow. The main reason was steam catalysis in CaO carbonation. Enhancement of steam on CaO carbonation performance without Ca(OH){sub 2} production could not be attributed to improvement of steam on the physical property, but to catalytic effect of steam. Effects of CaO precursors, CO{sub 2} partial pressure, steam partial pressure, and temperature with steam addition on CaO carbonation performance were also investigated.

Yang, S.J.; Xiao, Y.H. [Chinese Academy of Science, Beijing (China)

2008-06-15T23:59:59.000Z

237

Tracking topic birth and death in LDA.  

SciTech Connect (OSTI)

Most topic modeling algorithms that address the evolution of documents over time use the same number of topics at all times. This obscures the common occurrence in the data where new subjects arise and old ones diminish or disappear entirely. We propose an algorithm to model the birth and death of topics within an LDA-like framework. The user selects an initial number of topics, after which new topics are created and retired without further supervision. Our approach also accommodates many of the acceleration and parallelization schemes developed in recent years for standard LDA. In recent years, topic modeling algorithms such as latent semantic analysis (LSA)[17], latent Dirichlet allocation (LDA)[10] and their descendants have offered a powerful way to explore and interrogate corpora far too large for any human to grasp without assistance. Using such algorithms we are able to search for similar documents, model and track the volume of topics over time, search for correlated topics or model them with a hierarchy. Most of these algorithms are intended for use with static corpora where the number of documents and the size of the vocabulary are known in advance. Moreover, almost all current topic modeling algorithms fix the number of topics as one of the input parameters and keep it fixed across the entire corpus. While this is appropriate for static corpora, it becomes a serious handicap when analyzing time-varying data sets where topics come and go as a matter of course. This is doubly true for online algorithms that may not have the option of revising earlier results in light of new data. To be sure, these algorithms will account for changing data one way or another, but without the ability to adapt to structural changes such as entirely new topics they may do so in counterintuitive ways.

Wilson, Andrew T.; Robinson, David Gerald

2011-09-01T23:59:59.000Z

238

Generalized quantum gravity condensates for homogeneous geometries and cosmology  

E-Print Network [OSTI]

We construct a generalized class of quantum gravity condensate states, that allows the description of continuum homogeneous quantum geometries within the full theory. They are based on similar ideas already applied to extract effective cosmological dynamics from the group field theory formalism, and thus also from loop quantum gravity. However, they represent an improvement over the simplest condensates used in the literature, in that they are defined by an infinite superposition of graph-based states encoding in a precise way the topology of the spatial manifold. The construction is based on the definition of refinement operators on spin network states, written in a second quantized language. The construction lends itself easily to be applied also to the case of spherically symmetric quantum geometries.

Daniele Oriti; Daniele Pranzetti; James P. Ryan; Lorenzo Sindoni

2015-01-05T23:59:59.000Z

239

Renewal convergence rates and correlation decay for homogeneous pinning models  

E-Print Network [OSTI]

A class of discrete renewal processes with super-exponentially decaying inter-arrival distributions coincides with the infinite volume limit of general homogeneous pinning models in their localized phase. Pinning models are statistical mechanics systems to which a lot of attention has been devoted both for their relevance for applications and because they are solvable models exhibiting a non-trivial phase transition. The spatial decay of correlations in these systems is directly mapped to the speed of convergence to equilibrium for the associated renewal processes. We show that close to criticality, under general assumptions, the correlation decay rate, or the renewal convergence rate, coincides with the inter-arrival decay rate. We also show that, in general, this is false away from criticality. Under a stronger assumption on the inter-arrival distribution we establish a local limit theorem, capturing thus the sharp asymptotic behavior of correlations.

Giambattista Giacomin

2007-06-03T23:59:59.000Z

240

Statistical mechanics of homogeneous partly pinned fluid systems  

E-Print Network [OSTI]

The homogeneous partly pinned fluid systems are simple models of a fluid confined in a disordered porous matrix obtained by arresting randomly chosen particles in a one-component bulk fluid or one of the two components of a binary mixture. In this paper, their configurational properties are investigated. It is shown that a peculiar complementarity exists between the mobile and immobile phases, which originates from the fact that the solid is prepared in presence of and in equilibrium with the adsorbed fluid. Simple identities follow, which connect different types of configurational averages, either relative to the fluid-matrix system or to the bulk fluid from which it is prepared. Crucial simplifications result for the computation of important structural quantities, both in computer simulations and in theoretical approaches. Finally, possible applications of the model in the field of dynamics in confinement or in strongly asymmetric mixtures are suggested.

Vincent Krakoviack

2010-12-05T23:59:59.000Z

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241

Testing gaussianity, homogeneity and isotropy with the cosmic microwave background  

E-Print Network [OSTI]

We review the basic hypotheses which motivate the statistical framework used to analyze the cosmic microwave background, and how that framework can be enlarged as we relax those hypotheses. In particular, we try to separate as much as possible the questions of gaussianity, homogeneity and isotropy from each other. We focus both on isotropic estimators of non-gaussianity as well as statistically anisotropic estimators of gaussianity, giving particular emphasis on their signatures and the enhanced "cosmic variances" that become increasingly important as our putative Universe becomes less symmetric. After reviewing the formalism behind some simple model-independent tests, we discuss how these tests can be applied to CMB data when searching for large scale "anomalies"

L. Raul Abramo; Thiago S. Pereira

2010-05-13T23:59:59.000Z

242

Recent Topics in Formal Epistemology [ Home ] [ Syllabus  

E-Print Network [OSTI]

Recent Topics in Formal Epistemology [ Home ] [ Syllabus ] Professor Time & Place Branden Fitelson as the semester unfolds... 09/07/11: No readings for this week. I'm just going over the syllabus (and a few other Epistemology: Syllabus http://fitelson.org/topics/syllabus.html 1 of 2 9/6/11 1:40 AM #12;09/14/11: No meeting

Fitelson, Branden

243

Advanced Topics in Types and Programming Languages  

E-Print Network [OSTI]

Advanced Topics in Types and Programming Languages Benjamin C. Pierce, editor The MIT Press Advanced Topics in Types and programming languages / Benjamin C. Pierce, editor p. cm. Includes bibliographical references and index. ISBN 0-262-16228-8 (hc.: alk. paper) 1. Programming languages (Electronic

Pitts, Andrew

244

attenuates hyperhomocysteinemia-induced cardiomyocytic: Topics...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and borehole acoustic models. The validity of the scheme is established using a 3D homogenous isotropic ... Krasovec, Mary L. 2003-01-01 29 THE ATTENUATED RAY TRANSFORM...

245

attenuates lipopolysaccharide-induced inflammatory: Topics by...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and borehole acoustic models. The validity of the scheme is established using a 3D homogenous isotropic ... Krasovec, Mary L. 2003-01-01 37 THE ATTENUATED RAY TRANSFORM...

246

Opportunities for Catalysis in The 21st Century. A report from the Basic Energy Sciences Advisory Committee  

SciTech Connect (OSTI)

Chemical catalysis affects our lives in myriad ways. Catalysis provides a means of changing the rates at which chemical bonds are formed and broken and of controlling the yields of chemical reactions to increase the amounts of desirable products from these reactions and reduce the amounts of undesirable ones. Thus, it lies at the heart of our quality of life: The reduced emissions of modern cars, the abundance of fresh food at our stores, and the new pharmaceuticals that improve our health are made possible by chemical reactions controlled by catalysts. Catalysis is also essential to a healthy economy: The petroleum, chemical, and pharmaceutical industries, contributors of $500 billion to the gross national product of the United States, rely on catalysts to produce everything from fuels to ''wonder drugs'' to paints to cosmetics. Today, our Nation faces a variety of challenges in creating alternative fuels, reducing harmful by-products in manufacturing, cleaning up the environment and preventing future pollution, dealing with the causes of global warming, protecting citizens from the release of toxic substances and infectious agents, and creating safe pharmaceuticals. Catalysts are needed to meet these challenges, but their complexity and diversity demand a revolution in the way catalysts are designed and used. This revolution can become reality through the application of new methods for synthesizing and characterizing molecular and material systems. Opportunities to understand and predict how catalysts work at the atomic scale and the nanoscale are now appearing, made possible by breakthroughs in the last decade in computation, measurement techniques, and imaging and by new developments in catalyst design, synthesis, and evaluation.

White, J. M.; Bercaw, J.

2002-05-16T23:59:59.000Z

247

Numerical homogenization of concrete microstructures without explicit meshes  

SciTech Connect (OSTI)

Life management of electric hydro or nuclear power plants requires to estimate long-term concrete properties on facilities, for obvious safety and serviceability reasons. Decades-old structures are foreseen to be operational for several more decades. As a large number of different concrete formulations are found in EDF facilities, empirical models based on many experiments cannot be an option for a large fleet of power plant buildings. To build predictive models, homogenization techniques offer an appealing alternative. To properly upscale creep, especially at long term, a rather precise description of the microstructure is required. However, the complexity of the morphology of concrete poses several challenges. In particular, concrete is formulated to maximize the packing density of the granular skeleton, leading to aggregates spanning several length scales with small inter particle spacings. Thus, explicit meshing of realistic concrete microstructures is either out of reach of current meshing algorithms or would produce a number of degrees of freedom far higher than the current generic FEM codes capabilities. This paper proposes a method to deal with complex matrix-inclusions microstructures such as the ones encountered at the mortar or concrete scales, without explicitly meshing them. The microstructure is superimposed to an independent mesh, which is a regular Cartesian grid. This inevitably yields so called 'gray elements', spanning across multiple phases. As the reliability of the estimate of the effective properties highly depends on the behavior affected to these gray elements, special attention is paid to them. As far as the question of the solvers is concerned, generic FEM codes are found to lack efficiency: they cannot reach high enough levels of discretization with classical free meshes, and they do not take advantage of the regular structure of the mesh. Thus, a specific finite differences/finite volumes solver has been developed. At first, generic off-the-shelf linear system solvers were used. To further improve the efficiency in terms of memory requirements, specific variants of the preconditioned conjugate gradient were implemented. This allowed to homogenize the conductivity of a concrete-like microstructure using more than 10{sup 9} degrees of freedom on a rather common hardware for 2010 (a PC embedding 48 GB of RAM). Taking benefit of the properties of the regular Cartesian grid we have also investigated a multi-level method to improve the CPU efficiency of the code.

Sanahuja, Julien, E-mail: julien.sanahuja@edf.fr; Toulemonde, Charles, E-mail: charles.toulemonde@edf.fr

2011-12-15T23:59:59.000Z

248

Structural, Spectroscopic, And Theoretical Elucidation of a Redox-Active Pincer-Type Ancillary Applied in Catalysis  

SciTech Connect (OSTI)

Pincer-type ligands are believed to be very robust scaffolds that can support multifarious functionalities as well as highly reactive metal motifs applied in organometallic chemistry, especially in the realm of catalysis. In this paper, we describe the redox and, therefore, noninnocent behavior of a PNP (PNP{sup -} = N[2-P(CHMe{sub 2}){sub 2}-4-methylphenyl]{sub 2}) pincer ancillary bound to nickel. A combination of structural, spectroscopic, and theoretical techniques suggests that this type of framework can house an electron hole when coordinated to Ni(II).

Adhikari, D.; Mossin, S.; Basuli, F.; Huffman, J.C.; Szilagyi, R.K.; Meyer, K.; Mindiola, D.J.

2009-05-11T23:59:59.000Z

249

E-Print Network 3.0 - activity feed homogeneity Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

results for: activity feed homogeneity Page: << < 1 2 3 4 5 > >> 1 Bistro Data Feed Management System Theodore Johnson Vladislav Shkapenyuk Divesh Srivastava Summary:...

250

Solar energy storage through the homogeneous electrocatalytic reduction of carbon dioxide : photoelectrochemical and photovoltaic approaches  

E-Print Network [OSTI]

electricity from photovoltaic cells to convert CO 2 intoSolar Energy Anode Photovoltaic Cell Cathode PP Mesh SpacerCoupling a Photovoltaic Solar Cell with a Homogeneous

Sathrum, Aaron John

2011-01-01T23:59:59.000Z

251

Effect of ambient conditions and fuel properties on homogeneous charge compression ignition engine operation  

E-Print Network [OSTI]

Practical application of Homogeneous Charge Compression Ignition (HCCI) combustion must demonstrate robust responses to variations in environmental conditions. This work examines the impact of ambient conditions and fuel ...

Andreae, Morgan M. (Morgan MacKenzie)

2006-01-01T23:59:59.000Z

252

Evaluation of the core physics and safety characteristics of a quasi-homogeneous LMFBR concept  

SciTech Connect (OSTI)

A core design concept utilizing two types of driver assemblies that differ in fuel pin diameter has been investigated as an alternative to the heterogeneous LMFBR core for achieving low HCDA energetics. Core designs based on the (quasi-homogeneous) concept were developed and their performance compared to that of standard homogeneous and hetergeneous cores. It is shown that quasi-homogenous cores can be designed which possess many of the performance advantages of homogeneous cores (such as reduced power mismatches and local power swings), while retaining the potential safty advantages of heterogeneous cores (such as an incoherent response during loss-of-flow accidents and a reduced coolant void reactivity worth).

Khalil, H.; Yarlagadda, B.S.

1984-01-01T23:59:59.000Z

253

Bifurcation behavior in homogeneous-heterogeneous combustion. Part 2; Computations for stagnation-point flow  

SciTech Connect (OSTI)

Bifurcation analysis of ignition and extinction of combustion in stagnation-point flow was carried out for conditions when both homogeneous and heterogeneous reactions can occur. A technique based on the bifurcation theory and the shooting algorithm is developed, which permits fast and efficient tracking of bifurcation in these systems. The influences of the different parameters on the ignition and extinction behavior were investigated by assuming (1) only catalytic surface (heterogeneous) reaction, (2) only homogeneous reaction on a hot inert surface, and (3) both surface and homogeneous reactions. The coupling effects of the homogeneous and heterogeneous reactions are clearly demonstrated. It is shown that the heterogeneous reaction dominates the system behavior at the lower temperature while both homogeneous and heterogeneous reactions play important role at higher temperature. It is predicted that the homogeneous ignition temperature is higher with surface reaction than without surface reaction. However, homogeneous-heterogeneous or homogeneous reaction alone. The numerical results for propane and for methane oxidation on platinum foil also show good qualitative agreements with the experimental results of Part I of this article, which include the two types of ignition, extinction and autothermal behavior of homogeneous-heterogeneous reactions.

Song, X.; Williams, W.R.; Schmidt, L.D.; Aris, R. (Dept. of Chemical Engineering and Materials Science, Univ. of Minnesota, Minneapolis, MN (US))

1991-04-01T23:59:59.000Z

254

Method of fabricating a homogeneous wire of inter-metallic alloy  

DOE Patents [OSTI]

A method for fabricating a homogeneous wire of inter-metallic alloy comprising the steps of providing a base-metal wire bundle comprising a metal, an alloy or a combination thereof; working the wire bundle through at least one die to obtain a desired dimension and to form a precursor wire; and, controllably heating the precursor wire such that a portion of the wire will become liquid while simultaneously maintaining its desired shape, whereby substantial homogenization of the wire occurs in the liquid state and additional homogenization occurs in the solid state resulting in a homogenous alloy product.

Ohriner, Evan Keith (Knoxville, TN); Blue, Craig Alan (Knoxville, TN)

2001-01-01T23:59:59.000Z

255

Soliton ratchets in homogeneous nonlinear Klein-Gordon systems  

E-Print Network [OSTI]

We study in detail the ratchet-like dynamics of topological solitons in homogeneous nonlinear Klein-Gordon systems driven by a bi-harmonic force. By using a collective coordinate approach with two degrees of freedom, namely the center of the soliton, $X(t)$, and its width, $l(t)$, we show, first, that energy is inhomogeneously pumped into the system, generating as result a directed motion; and, second, that the breaking of the time shift symmetry gives rise to a resonance mechanism that takes place whenever the width $l(t)$ oscillates with at least one frequency of the external ac force. In addition, we show that for the appearance of soliton ratchets, it is also necesary to break the time-reversal symmetry. We analyze in detail the effects of dissipation in the system, calculating the average velocity of the soliton as a function of the ac force and the damping. We find current reversal phenomena depending on the parameter choice and discuss the important role played by the phases of the ac force. Our analytical calculations are confirmed by numerical simulations of the full partial differential equations of the sine-Gordon and $\\phi^4$ systems, which are seen to exhibit the same qualitative behavior. Our results are in agreement with recent experimental work on dissipation induced symmetry breaking.

Luis Morales-Molina; Niurka R. Quintero; Franz G. Mertens; Angel Sanchez

2005-11-30T23:59:59.000Z

256

Condensation of cloud microdroplets in homogeneous isotropic turbulence  

E-Print Network [OSTI]

The growth by condensation of small water droplets in a three-dimensional homogeneous isotropic turbulent flow is considered. Within a simple model of advection and condensation, the dynamics and growth of millions of droplets are integrated. A droplet-size spectra broadening is obtained and it is shown to increase with the Reynolds number of turbulence, by means of two series of direct numerical simulations at increasing resolution. This is a key point towards a proper evaluation of the effects of turbulence for condensation in warm clouds, where the Reynolds numbers typically achieve huge values. The obtained droplet-size spectra broadening as a function of the Reynolds number is shown to be consistent with dimensional arguments. A generalization of this expectation to Reynolds numbers not accessible by DNS is proposed, yielding upper and lower bounds to the actual size-spectra broadening. A further DNS matching the large scales of the system suggests consistency of the picture drawn, while additional effort is needed to evaluate the impact of this effect for condensation in more realistic cloud conditions.

Alessandra S. Lanotte; Agnese Seminara; Federico Toschi

2008-07-15T23:59:59.000Z

257

Homogeneous ice nucleation evaluated for several water models  

E-Print Network [OSTI]

In this work, we evaluate by means of computer simulations the rate for ice homogeneous nucleation for several water models such as TIP4P, TIP4P/2005,TIP4P/ICE, and mW (following the same procedure as in Sanz et al. [J. Am. Chem. Soc.135, 15008 (2013)]) in a broad temperature range. We estimate the ice-liquid interfacial free-energy, and conclude that for all water models {\\gamma} decreases as the temperature decreases. Extrapolating our results to the melting temperature, we obtain a value of the interfacial free-energy between 25 and 32 mN/m in reasonable agreement with the reported experimental values. Moreover, we observe that the values of {\\gamma} depend on the chosen water model and this is a key factor when numerically evaluating nucleation rates, given that the kinetic prefactor is quite similar for all water models with the exception of the mW (due to the absence of hydrogens). Somewhat surprisingly the estimates of the nucleation rates found in this work for TIP4P/2005 are slightly higher than those of the mW model, even though the former has explicit hydrogens. Our results suggest that it may be possible to observe in computer simulations spontaneous crystallization of TIP4P/2005 at about 60 K below the melting point.

J. R. Espinosa; E. Sanz; C. Valeriani; C. Vega

2014-11-25T23:59:59.000Z

258

Geodesic Particle Paths Inside a Nonrotating, Homogeneous, Spherical Body  

E-Print Network [OSTI]

Proceeding from a solution of field equations that are improved versions of Einstein's nonvacuum gravitational field equations one is able to calculate precisely the trajectories of particles traveling inside a nonrotating, homogeneous, spherical body. Application of the results to the conditions of recent measurements of neutrino flight times between a source point A at CERN's European Laboratory for Particle Physics and a point B in either of two detectors (ICARUS or OPERA) at LNGS (Laboratori Nazionale del Gran Sasso), separated by a euclidean distance d(A,B) = 731 km, predicts for the flight time from A to B of a 2 eV neutrino launched with energy 17 GeV, as measured by a clock at B synchronized to a similar clock at A, approximately d/c + 9.3 x 10^{-16} sec. But as measured by inertial observers along the path the predicted flight time is approximately d/c - 2.6 x 10^{-9} sec and the predicted path length is approximately d - 8.4 x 10^{-7} m, which yields c + 321 m/sec for the predicted average inertially referenced speed of the neutrino from A to B.

Homer G. Ellis

2012-10-18T23:59:59.000Z

259

Dynamic control of a homogeneous charge compression ignition engine  

DOE Patents [OSTI]

A homogenous charge compression ignition engine is operated by compressing a charge mixture of air, exhaust and fuel in a combustion chamber to an autoignition condition of the fuel. The engine may facilitate a transition from a first combination of speed and load to a second combination of speed and load by changing the charge mixture and compression ratio. This may be accomplished in a consecutive engine cycle by adjusting both a fuel injector control signal and a variable valve control signal away from a nominal variable valve control signal. Thereafter in one or more subsequent engine cycles, more sluggish adjustments are made to at least one of a geometric compression ratio control signal and an exhaust gas recirculation control signal to allow the variable valve control signal to be readjusted back toward its nominal variable valve control signal setting. By readjusting the variable valve control signal back toward its nominal setting, the engine will be ready for another transition to a new combination of engine speed and load.

Duffy, Kevin P. (Metamora, IL); Mehresh, Parag (Peoria, IL); Schuh, David (Peoria, IL); Kieser, Andrew J. (Morton, IL); Hergart, Carl-Anders (Peoria, IL); Hardy, William L. (Peoria, IL); Rodman, Anthony (Chillicothe, IL); Liechty, Michael P. (Chillicothe, IL)

2008-06-03T23:59:59.000Z

260

Modeling of homogeneous charge compression ignition (HCCI) of methane  

SciTech Connect (OSTI)

The operation of piston engines on a compression ignition cycle using a lean, homogeneous charge has many potential attractive features. These include the potential for extremely low NO{sub x} and particulate emissions while maintaining high thermal efficiency and not requiring the expensive high pressure injection system of the typical modem diesel engine. Using the HCT chemical kinetics code to simulate autoignition of methane-air mixtures, we have explored the ignition timing, burn duration, NO{sub x} production, indicated efficiency and power output of an engine with a compression ratio of 15:1 at 1200 and 2400 rpm. HCT was modified to include the effects of heat transfer. This study used a single control volume reaction zone that varies as a function of crank angle. The ignition process is controlled by varying the intake equivalence ratio and varying the residual gas trapping (RGT). RGT is internal exhaust gas recirculation which recycles both heat and combustion product species. It is accomplished by varying the timing of the exhaust valve closure. Inlet manifold temperature was held constant at 330 Kelvins. Results show that there is a narrow range of operational conditions that show promise of achieving the control necessary to vary power output while keeping indicated efficiency above 50% and NO{sub x} levels below 100 ppm.

Smith, J.R.; Aceves, S.M.; Westbrook, C.; Pitz, W.

1997-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Panaches horizontaux non-Boussinesq en milieu homog\\`ene  

E-Print Network [OSTI]

The environmental impact of pollutants and effluents discharged into the atmosphere or the oceans has led researchers to conduct studies related to this issue. Several works have been carried out in this context in order to reduce the effect on the local environment. These types of ejections in nature are modeled as jets in the presence of a density gradient. In this study we treated the problem of inclined round turbulent buoyant jets and plumes ejected in a homogeneous or stratified fluid, at rest or in motion. The prediction of the flow behavior, i.e. the evolution of its variables, is first treated theoretically from a model whose formalism is valid in both the Boussinesq case as well as in the non-Boussinesq general case. Solving the equations governing the plumes is performed numerically using a Runge-Kutta 4th order. To validate the model, laboratory experiments are performed with round jets of air and helium for a wide range of densities. The confrontation theory-experience aims here to fix the limits...

Daddi-Moussa-Ider, Abdallah; Mehaddi, Rabah; Vauquelin, Olivier; Candelier, Fabien

2014-01-01T23:59:59.000Z

262

Events & Topics in Renewable Energy & the Environment featuring...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Events & Topics in Renewable Energy & the Environment featuring Chenyang Lu Events & Topics in Renewable Energy & the Environment featuring Chenyang Lu Smart Buildings with...

263

TEC Working Group Topic Groups Archives Communications Meeting...  

Office of Environmental Management (EM)

TEC Working Group Topic Groups Archives Communications Conference Call Summaries TEC Meeting Summaries - January 1997 TEC Working Group Topic Groups Tribal Conference Call...

264

List of Topics for Interagency Performance & Risk Assessment...  

Office of Environmental Management (EM)

List of Topics for Interagency Performance & Risk Assessment Community of Practice (P&RA CoP) Discussion List of Topics for Interagency Performance & Risk Assessment Community of...

265

Studies of Immobilized Homogeneous Metal Catalysts on Silica Supports  

SciTech Connect (OSTI)

The tethered, chiral, chelating diphosphine rhodium complex, which catalyzes the enantioselective hydrogenation of methyl-{alpha}-acetamidocinnamate (MAC), has the illustrated structure as established by {sup 31}P NMR and IR studies. Spectral and catalytic investigations also suggest that the mechanism of action of the tethered complex is the same as that of the untethered complex in solution. The rhodium complexes, [Rh(COD)H]{sub 4}, [Rh(COD){sub 2}]{sup +}BF{sub 4}{sup -}, [Rh(COD)Cl]{sub 2}, and RhCl{sub 3} {center_dot} 3H{sub 2}O, adsorbed on SiO{sub 2} are optimally activated for toluene hydrogenation by pretreatment with H{sub 2} at 200 C. The same complexes on Pd-SiO{sub 2} are equally active without pretreatments. The active species in all cases is rhodium metal. The catalysts were characterized by XPS, TEM, DRIFTS, and mercury poisoning experiments. Rhodium on silica catalyzes the hydrogenation of fluorobenzene to produce predominantly fluorocyclohexane in heptane and 1,2-dichloroethane solvents. In heptane/methanol and heptane/water solvents, hydrodefluorination to benzene and subsequent hydrogenation to cyclohexane occurs exclusively. Benzene inhibits the hydrodefluorination of fluorobenzene. In DCE or heptane solvents, fluorocyclohexane reacts with hydrogen fluoride to form cyclohexene. Reaction conditions can be chosen to selectively yield fluorocyclohexane, cyclohexene, benzene, or cyclohexane. The oxorhenium(V) dithiolate catalyst [-S(CH{sub 2}){sub 3}s-]Re(O)(Me)(PPh{sub 3}) was modified by linking it to a tether that could be attached to a silica support. Spectroscopic investigation and catalytic oxidation reactivity showed the heterogenized catalyst's structure and reactivity to be similar to its homogeneous analog. However, the immobilized catalyst offered additional advantages of recyclability, extended stability, and increased resistance to deactivation.

Keith James Stanger

2003-05-31T23:59:59.000Z

266

antiquarks: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 1 Relation between quark-antiquark potential and quark-antiquark free energy in hadronic matter HEP - Phenomenology (arXiv) Summary: We study the relation...

267

auditing: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Society (ER100PP184ER200PP284) Topics: Personal energy audit, the grid, nuclear, fracking Renewable Energy Websites Summary: Energy and Society (ER100PP184ER200PP284)...

268

audits: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Society (ER100PP184ER200PP284) Topics: Personal energy audit, the grid, nuclear, fracking Renewable Energy Websites Summary: Energy and Society (ER100PP184ER200PP284)...

269

Safety Topic: Rota/ng Equipment  

E-Print Network [OSTI]

Safety Topic: Rota/ng Equipment Jus/n Kleingartner #12;Safety protocols 2 #12;Safety protocols for opera/ng a lathe · Don'ts: ­ Do not wear gloves

Cohen, Robert E.

270

a: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 141 A cluster theory for a Janus fluid Condensed Matter (arXiv) Summary: Recent Monte Carlo simulations on...

271

Topics in Contemporary Mathematics Instructor: Sam Smith  

E-Print Network [OSTI]

MATH 1171 Topics in Contemporary Mathematics Syllabus Fall 2009 Instructor: Sam Smith Office: Barbelin 212, email smith@sju.edu, x1559 Office Hours: Tue 10:00-11:30, 1:00-2:30,Thur 10

Smith, Sam

272

Advanced topics in control systems theory II  

E-Print Network [OSTI]

Advanced topics in control systems theory II Lecture notes from FAP 2005 Editors: Antonio Lor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 1.8.2 Inverted Pendulum.4 The desired energy function Hd with kv = 0. . . . . . . . . . . . . . . . . . 32 1.5 Closed-loop responses

Nesic, Dragan

273

MA 266 Review Topics - Exam # 2  

E-Print Network [OSTI]

Page 1. Spring 2012. MA 266. Review Topics - Exam # 2 ..... and using a table of Laplace transforms (see table on page 317) and using linearity : L{f(t) + g(t)} ...

2012-03-05T23:59:59.000Z

274

MA 266 Review Topics - Exam # 1  

E-Print Network [OSTI]

Page 1. Spring 2012. MA 266. Review Topics - Exam # 1. (1) Special Types of First Order Equations. I. First Order Linear Equation (FOL): dy dt. + p(t)y = g(t).

2012-01-25T23:59:59.000Z

275

MA 266 Review Topics - Exam # 2 (updated)  

E-Print Network [OSTI]

Page 1. Spring 2012. MA 266. Review Topics - Exam # 2 (updated) ..... and using a table of Laplace transforms (see table on page 317) and using linearity : L{f(t) ...

2012-04-23T23:59:59.000Z

276

access: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Web Accessibility Accessibility Biotechnology Websites Summary: Web Accessibility...

277

accessibility: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Web Accessibility Accessibility Biotechnology Websites Summary: Web Accessibility...

278

Homogeneous, dual layer, solid state, thin film deposition for structural and/or electrochemical characteristics  

DOE Patents [OSTI]

Solid state, thin film, electrochemical devices (10) and methods of making the same are disclosed. An exemplary device 10 includes at least one electrode (14) and an electrolyte (16) deposited on the electrode (14). The electrolyte (16) includes at least two homogenous layers of discrete physical properties. The two homogenous layers comprise a first dense layer (15) and a second porous layer (16).

Pitts, J. Roland; Lee, Se-Hee; Tracy, C. Edwin; Li, Wenming

2014-04-08T23:59:59.000Z

279

Thermal Decomposition of Dichlorosilane Investigated by Pulsed Laser Powered Homogeneous Pyrolysis  

E-Print Network [OSTI]

of vacuum flash pyrolysis of SiH 2Cl2. Ban and Gilbert6 observed SiCl2 by mass spectrometry under sili- conThermal Decomposition of Dichlorosilane Investigated by Pulsed Laser Powered Homogeneous Pyrolysis powered homogeneous pyrolysis of dichlorosilane are reported. Pyrolyses at temperatures of 1350 to 1700 K

Swihart, Mark T.

280

Mechanisms of Homogeneous Nucleation of Polymers of Sickle Cell Anemia Hemoglobin in Deoxy State  

E-Print Network [OSTI]

Mechanisms of Homogeneous Nucleation of Polymers of Sickle Cell Anemia Hemoglobin in Deoxy State, TX 77204-4004, USA The primary pathogenic event of sickle cell anemia is the polymerization reserved. Keywords: sickle cell anemia; hemoglobin S polymerization; fiber nucleation; homogeneous

Vekilov, Peter

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Effect of high pressure homogenization on the physical properties of milk  

E-Print Network [OSTI]

Milk was homogenized at pressures ranging from 17.2 MPa to 100 MPa to determine the effect of homogenization pressure on the fat globule size distribution, viscosity, color, and temperature changes in milk. Milk containing 0, 1.5 and 3.0% milk fat...

Gonzalez De Cossio, Carlos

1994-01-01T23:59:59.000Z

282

The saddle-node of nearly homogeneous wave trains in reaction-diffusion systems  

E-Print Network [OSTI]

The saddle-node of nearly homogeneous wave trains in reaction-diffusion systems Jens D homogeneous oscillations created in the bifurcation, we investigate existence and stability of wave trains trains and determine their stability on the unbounded real line. We confirm that the accompanying wave

Scheel, Arnd

283

High Efficiency, Low Emissions Homogeneous Charge Compression Ignition (HCCI) Engines  

SciTech Connect (OSTI)

This is the final report of the High Efficiency Clean Combustion (HECC) Research Program for the U.S. Department of Energy. Work under this co-funded program began in August 2005 and finished in July 2010. The objective of this program was to develop and demonstrate a low emission, high thermal efficiency engine system that met 2010 EPA heavy-duty on-highway truck emissions requirements (0.2g/bhp-hr NOx, 0.14g/bhp-hr HC and 0.01g/bhp-hr PM) with a thermal efficiency of 46%. To achieve this goal, development of diesel homogenous charge compression ignition (HCCI) combustion was the chosen approach. This report summarizes the development of diesel HCCI combustion and associated enabling technologies that occurred during the HECC program between August 2005 and July 2010. This program showed that although diesel HCCI with conventional US diesel fuel was not a feasible means to achieve the program objectives, the HCCI load range could be increased with a higher volatility, lower cetane number fuel, such as gasoline, if the combustion rate could be moderated to avoid excessive cylinder pressure rise rates. Given the potential efficiency and emissions benefits, continued research of combustion with low cetane number fuels and the effects of fuel distillation are recommended. The operation of diesel HCCI was only feasible at part-load due to a limited fuel injection window. A 4% fuel consumption benefit versus conventional, low-temperature combustion was realized over the achievable operating range. Several enabling technologies were developed under this program that also benefited non-HCCI combustion. The development of a 300MPa fuel injector enabled the development of extended lifted flame combustion. A design methodology for minimizing the heat transfer to jacket water, known as precision cooling, will benefit conventional combustion engines, as well as HCCI engines. An advanced combustion control system based on cylinder pressure measurements was developed. A Well-to-wheels analysis of the energy flows in a mobile vehicle system and a 2nd Law thermodynamic analysis of the engine system were also completed under this program.

None

2011-01-31T23:59:59.000Z

284

SELECTIVE REDUCTION OF NOX IN OXYGEN RICH ENVIRONMENTS WITH PLASMA-ASSISTED CATALYSIS: CATALYST DEVELOPMENT AND MECHANISTIC STUDIES  

SciTech Connect (OSTI)

The control of NOx (NO and NO2) emissions from so-called ''lean-burn'' vehicle engines remains a challenge. In recent years, there have been a number of reports that show that a plasma device combined with a catalyst can reduce as high as 90% or more of NOx in simulated diesel and other ''lean-burn'' exhaust. In the case of propylene containing simulated diesel exhaust, the beneficial role of a plasma treatment is now thought to be due to oxidation of NO to NO2, and the formation of partially oxidized hydrocarbons that are more active for the catalytic reduction of NO2 than propylene. Thus, the overall system can be most usefully described as hydrocarbon selective catalytic reduction (SCR) enhanced by 'reforming' the exhaust with a non-thermal plasma (NTP) device. For plasma-enhanced catalysis, both zeolite- and alumina-based materials have shown high activity, albeit in somewhat different temperature ranges, when preceded by an NTP reactor. This paper will briefly describe our research efforts aimed at optimizing the catalyst materials for NTP-catalysis devices based, in part, on our continuing studies of the NTP- and catalytic-reaction mechanisms. Various alkali- and alkaline earth-cation-exchanged Y zeolites have been prepared, their material properties characterized, and they have been tested as catalytic materials for NOx reduction in laboratory NTP-catalysis reactors. Interestingly, NO2 formed in the plasma and not subsequently removed over these catalysts, will back-convert to NO, albeit to varying extents depending upon the nature of the cation. Besides this comparative reactivity, we will also discuss selected synthesis strategies for enhancing the performance of these zeolite-based catalyst materials. A particularly important result from our mechanistic studies is the observation that aldehydes, formed during the plasma treatment of simulated diesel exhaust, are the important species for the reduction of NOx to N2. Indeed, acetaldehyde has been found to be especially effective in the thermal reduction of both NO and NO2 over Ba- and Na-Y zeolite catalysts.

Peden, C; Barlow, S; Hoard, J; Kwak, J; *Balmer-Millar, M; *Panov, A; Schmieg, S; Szanyi, J; Tonkyn, R

2003-08-24T23:59:59.000Z

285

Tunable Solvents for Homogeneous Catalyst Recycle Jie Lu, Michael J. Lazzaroni, Jason P. Hallett, Andreas S. Bommarius,  

E-Print Network [OSTI]

for product purification and catalyst reuse. One example demonstrated is the dimethyl ether (DME)-water system, such as phase- transfer catalysis and near-critical water.2-4 Here we develop mixed-solvent systems of water and environmental advantages. In a mixed organic-aqueous tunable solvent (OATS), reactions between water

286

Topic 1: IntroductionTopic 1: Introduction What is a Computer?What is a Computer?  

E-Print Network [OSTI]

Topic 1: IntroductionTopic 1: Introduction 1 What is a Computer?What is a Computer? What is Computer Science?What is Computer Science? How do we Solve Problems with aHow do we Solve Problems with a Computer?Computer? What is a Computer?What is a Computer? 2 What is a Computer?What is a Computer

Stephenson, Ben

287

Anomalous Scaling and Refined Similarity of an Active Scalar in a Model of Homogeneous Turbulent Convection  

E-Print Network [OSTI]

Anomalous scaling in the statistics of an active scalar in homogeneous turbulent convection is studied using a dynamical shell model. We extend refined similarity ideas for homogeneous and isotropic turbulence to homogeneous turbulent convection and attribute the origin of the anomalous scaling to variations of the entropy transfer rate. We verify the consequences and thus the validity of our hypothesis by showing that the conditional statistics of the active scalar and the velocity at fixed values of entropy transfer rate are not anomalous but have simple scaling with exponents given by dimensional considerations, and that the intermittency corrections are given by the scaling exponents of the moments of the entropy transfer rate.

Emily S. C. Ching; W. C. Cheng

2007-11-07T23:59:59.000Z

288

Effect of homogenization pressure and milk composition on some physical properties of yogurt  

E-Print Network [OSTI]

(Fig. 7). The increase in firmness due to increased MF concentration was not linear. The increase in firmness that was observed when the MF concentration of the yogurt was increased &om 2 to 4% was much greater than the increase in firmness when MF...) Figure 6. Effect of homogenization pressure (HP) and solids-not-fat (SNF) on the firmness of yogurt. 25 120 4% MF 110 100 90 2% MF 80 70 0% MF 60 3000 6000 9000 12000 15000 Homogenization pressure (psi) Figure 7. Effect of homogenization...

Lin, Chun-An

1995-01-01T23:59:59.000Z

289

Research of a boundary condition quantifiable correction method in the assembly homogenization  

SciTech Connect (OSTI)

The methods and codes currently used in assembly homogenization calculation mostly adopt the reflection boundary conditions. The influences of real boundary conditions on the assembly homogenized parameters were analyzed. They were summarized into four quantifiable effects, and then the mathematical expressions could be got by linearization hypothesis. Through the calculation of a test model, it had been found that the result was close to transport calculation result when considering four boundary quantifiable effects. This method would greatly improve the precision of a core design code which using the assembly homogenization methods, but without much increase of the computing time. (authors)

Peng, L. H.; Liu, Z. H.; Zhao, J. [Inst. of Nuclear and New Energy Technology, Tsinghua Univ., Beijing, 100084 (China); Li, W. H. [China Nuclear Power Technology Research Inst., Shenzhen, 518026 (China)

2012-07-01T23:59:59.000Z

290

Boron-nitrogen-hydrogen (BNH) compounds: recent developments in hydrogen storage, applications in hydrogenation and catalysis, and new syntheses  

SciTech Connect (OSTI)

The strong efforts devoted to the exploration of BNH compounds for hydrogen storage have led to impressive advances in the field of boron chemistry. This review summarizes progress in this field from three aspects. It starts with the most recent developments in using BNH compounds for hydrogen storage, covering NH3BH3, B3H8¯ containing compounds, and CBN compounds. The following section then highlights interesting applications of BNH compounds in hydrogenation and catalysis. The last part is focused on breakthroughs in the syntheses and discovery of new BNH organic analogues. The role of N?H?+•••H?-?B dihydrogen interactions in molecule packing, thermal hydrogen evolution, and syntheses is also discussed within the review. Part of this research is supported by the U.S. Department of Energy’s Basic Energy Sciences, Division of Chemical Sciences, Biosciences and Geosciences. Pacific Northwest National Laboratory is operated by Battelle.

Huang, Zhenguo; Autrey, Thomas

2012-11-15T23:59:59.000Z

291

Crystal Structure of 12-Lipoxygenase Catalytic-Domain-Inhibitor Complex Identifies a Substrate-Binding Channel for Catalysis  

SciTech Connect (OSTI)

Lipoxygenases are critical enzymes in the biosynthesis of families of bioactive lipids including compounds with important roles in the initiation and resolution of inflammation and in associated diseases such as diabetes, cardiovascular disease, and cancer. Crystals diffracting to high resolution (1.9 {angstrom}) were obtained for a complex between the catalytic domain of leukocyte 12-lipoxygenase and the isoform-specific inhibitor, 4-(2-oxapentadeca-4-yne)phenylpropanoic acid (OPP). In the three-dimensional structure of the complex, the inhibitor occupied a new U-shaped channel open at one end to the surface of the protein and extending past the redox-active iron site that is essential for catalysis. In models, the channel accommodated arachidonic acid, defining the binding site for the substrate of the catalyzed reaction. There was a void adjacent to the OPP binding site connecting to the surface of the enzyme and providing a plausible access channel for the other substrate, oxygen.

Xu, Shu; Mueser, Timothy C.; Marnett, Lawrence J.; Funk, Jr., Max O. (Toledo); (Vanderbilt)

2014-10-02T23:59:59.000Z

292

Metal carbonyl-hydrosilane reactions and hydrosilation catalysis. Final report for period May 1, 1995 - August 14, 1999  

SciTech Connect (OSTI)

Manganese carbonyl complexes serve as hydrosilation precatalysts for selectively transforming a carbonyl group into a doxy methylene or a fully reduced methylene group. Substrates of interest include (1) aldehydes, ketones, carboxylic acids, silyl esters, and esters, and (2) their organometallic acyl counterparts. Two types of manganese precatalysts have been reported: (a) alkyl and acyl complexes (L)(CO){sub 4}MnR [L = CO, PPh{sub 3}; R = COCH{sub 3}, COPh, CH{sub 3}] and (b) halides (CO){sub 5}MnX and [(CO){sub 4}MnX]{sub 2} (X = Br, I). The former promote hydrosilation and deoxygenation catalysis; the latter promote dehydrogenative silation of alcohols and carboxylic acids as well as hydrosilation and deoxygenation of some metallocarboxylic acid derivatives. In every case studied, these Mn precatalysts are far more reactive or selective than traditional Rh(l) precatalysts. The reaction chemistry of the above and other Mn alkyl complexes with hydrosilanes was studied in order to probe catalysis mechanism(s). Thus, Mn(CO){sub 5} methyl, benzyl, acetyl, and benzoyl (4 p-substituents) complexes reacted with hydrosilines by four different mechanisms, which were established. A noteworthy development was that the methyl and benzoyl complexes gave moderate yields of a new ({eta}{sup 2}-Si-H) silane adduct (CO){sub 4}Mn(SiMe{sub 2}Ph)(H-SiMe{sub 2}Ph), which is stable in the presence of excess silane. This silane adduct promotes all three catalytic reactions; its extraordinary activity and potential selectivity are under study.

Cutler, Alan R.

2001-04-14T23:59:59.000Z

293

Effect of high pressure homogenization on the milk fat globule membrane and its relation with the emulsion stability of milk  

E-Print Network [OSTI]

pressure and heating temperature. Emulsion stability of milk increased with increased homogenization pressure and heat treatment, but was not affected by the milk fat concentrations used. Homogenization of milk increased the milk fat surface area...

Cano Ruiz, Maria Elena

1996-01-01T23:59:59.000Z

294

Homogeneous Factorisations of Graphs and Michael Giudici a, Cai Heng Li a  

E-Print Network [OSTI]

Homogeneous Factorisations of Graphs and Digraphs Michael Giudici a, Cai Heng Li a Primoz Potocnik@maths.uwa.edu.au (Michael Giudici), li@maths.uwa.edu.au (Cai Heng Li), primoz.potocnik@fmf.uni-lj.si (Primoz Preprint

Giudici, Michael

295

Molecular simulation study of homogeneous crystal nucleation in n-alkane melts  

E-Print Network [OSTI]

This work used molecular dynamics (MD) and Monte Carlo (MC) method to study the homogeneous crystal nucleation in the melts of n-alkanes, the simplest class of chain molecules. Three n-alkanes with progressive chain length ...

Yi, Peng, Ph. D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

296

Analysis of combustion in a small homogeneous charge compression assisted ignition engine  

E-Print Network [OSTI]

characteristics to homogeneous charge compression ignition (HCCI) engines. Difficulties such as unknown ignition.raine@auckland.ac.nz geneous charge compression ignition (HCCI) engines. JER03805 © IMechE 2006 Int. J. Engine Res. Vol. 7 #12

297

Extension of the high load limit in the Homogeneous Charge Compression Ignition engine  

E-Print Network [OSTI]

The Homogeneous Charge Compression Ignition (HCCI) engine offers diesel-like efficiency with very low soot and NOx emissions. In a HCCI engine, a premixed charge of air, fuel and burned gas is compressed to achieve ...

Scaringe, Robert J. (Robert Joseph)

2009-01-01T23:59:59.000Z

298

Rank and Set Restrictions for Homogeneity Analysis in R: The "homals" Package  

E-Print Network [OSTI]

Rank and Set Restrictions for Homogeneity Analysis in R:various extensions in terms of rank restrictions (nonlinearSection 2.1) in terms of rank restrictions (Section 2.2) and

Mair, Patrick; Leeuw, Jan de

2008-01-01T23:59:59.000Z

299

Rank and Set Restrictions for Homogeneity Analysis in R: The "homals" Package  

E-Print Network [OSTI]

Rank and Set Restrictions for Homogeneity Analysis in R:various extensions in terms of rank restrictions (nonlinearSection 2.1) in terms of rank restrictions (Section 2.2) and

Patrick Mair; Jan de Leeuw

2011-01-01T23:59:59.000Z

300

RATE OF STRAIN TENSOR STATISTICS IN COMPRESSIBLE HOMOGENEOUS G. Erlebacher 1 , S. Sarkar 1  

E-Print Network [OSTI]

RATE OF STRAIN TENSOR STATISTICS IN COMPRESSIBLE HOMOGENEOUS TURBULENCE G. Erlebacher 1 , S. Sarkar was determined in Sarkar, Erlebacher and Hus­ saini (ref. 2) to be due to enhanced compressible dis­ sipation

Erlebacher, Gordon

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Evolution of the Surface Science of Catalysis from Single Crystals to Metal Nanoparticles under Pressure  

SciTech Connect (OSTI)

Vacuum studies of metal single crystal surfaces using electron and molecular beam scattering revealed that the surface atoms relocate when the surface is clean (reconstruction) and when it is covered by adsorbates (adsorbate induced restructuring). It was also discovered that atomic steps and other low coordination surface sites are active for breaking chemical bonds (H-H, O=O, C-H, C=O and C-C) with high reaction probability. Investigations at high reactant pressures using sum frequency generation (SFG)--vibrational spectroscopy and high pressure scanning tunneling microscopy (HPSTM) revealed bond breaking at low reaction probability sites on the adsorbate-covered metal surface, and the need for adsorbate mobility for continued turnover. Since most catalysts (heterogeneous, enzyme and homogeneous) are nanoparticles, colloid synthesis methods were developed to produce monodispersed metal nanoparticles in the 1-10 nm range and controlled shapes to use them as new model catalyst systems in two-dimensional thin film form or deposited in mesoporous three-dimensional oxides. Studies of reaction selectivity in multipath reactions (hydrogenation of benzene, cyclohexene and crotonaldehyde) showed that reaction selectivity depends on both nanoparticle size and shape. The oxide-metal nanoparticle interface was found to be an important catalytic site because of the hot electron flow induced by exothermic reactions like carbon monoxide oxidation.

Somorjai, Gabor A.; Park, Jeong Y.

2008-03-06T23:59:59.000Z

302

The effect of temperature and homogenization pressure on enzymatic activity in cheese whey  

E-Print Network [OSTI]

THE EFFECT OF TEMPERATURE AND HOMOGENIZATION PRESSURE ON ENZYMATIC ACTIVITY IN CHEESE WHEY A Thesis by MARIA YANINA DEL CAWvKN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE August 1995 Major Subject; Food Science and Technology THE EFFECT OF TEMPERATURE AND HOMOGENIZATION PRESSURE ON ENZYMATIC ACTIVITY IN CHEESE WHEY A Thesis by MARIA YANINA DEL CARMEN Submitted to the Office of Graduate...

Del Carmen, Maria Yanina

1995-01-01T23:59:59.000Z

303

Intrinsic reactivity feedback characteristics for safety analysis of heterogeneous and homogeneous LMFBR core designs  

SciTech Connect (OSTI)

This paper presents a comparison of the intrinsic reactivity feedback characteristics of homogeneous and heterogeneous LMFBR designs. The comparisons are shown for a 1000 MWth LMFBR core design. However, the applicability of the conclusions drawn from these comparisons are generic to larger LMFBRs. Consistent sodium void worth distributions have been calculated for heterogeneous and homogeneous 1000 MWth LMFBR core designs. The basic calculations were performed with three dimensional models using ENDF/B-III cross section data and first order perturbation theory.

Doncals, R.A.; Lake, J.A.

1982-01-01T23:59:59.000Z

304

Integration of geodesic flows on homogeneous spaces: the case of a wild lie group  

E-Print Network [OSTI]

We obtain necessary and sufficient conditions for the integrability in quadratures of geodesic flows on homogeneous spaces $M$ with invariant and central metrics. The proposed integration algorithm consists in using a special canonical transformation in the space $T^*M$ based on constructing the canonical coordinates on the orbits of the coadjoint representation and on the simplectic sheets of the Poisson algebra of invariant functions. This algorithm is applicable to integrating geodesic flows on homogeneous spaces of a wild Lie group.

A. A. Magazev; I. V. Shirokov

2007-03-21T23:59:59.000Z

305

Two dimensional finite element analysis of homogenization and failure in plain weave textile composites  

E-Print Network [OSTI]

TWO DIMENSIONAL FINITE ELEMENT ANALYSIS OF HOMOGENIZATION AND FAILURE IN PLAIN WEAVE TEXTILE COMPOSITES A Thesis by VEERARAGHAVA GOPAL KONDAGUNTA Submitted to the Office of Graduate Studies of Texas ARM University In partial fulffllment... of the requirements for the degree of MASTER OF SCIENCE August 1993 Major Subject: Aerospace Engineering TWO DIMENSIONAL FINITE ELEMENT ANALYSIS OF HOMOGENIZATION AND FAILURE IN PLAIN WEAVE TEXTILE COMPOSITES A Thesis by VEERARAGHAVA GOPAL KONDAGUNTA...

Kondagunta, Veeraraghava Gopal

1993-01-01T23:59:59.000Z

306

ENVE 417 HYDRAULIC DESIGN TOPIC SYLLABUS  

E-Print Network [OSTI]

Applications in Hydraulic Engineering, 5th Edition, Haestad Press. 2002 Shun Dar Lin. Water and WastewaterENVE 417 HYDRAULIC DESIGN TOPIC SYLLABUS Current Catalog Data: Design of water and waste water. John Wiley & Sons, Inc. New York, NY. 2001. Hydraulic Design Handbook, Larry W. Mays, McGraw-Hill, New

Clark, Shirley E.

307

Six Hot Topics in Planetary Astronomy  

E-Print Network [OSTI]

Six hot topics in modern planetary astronomy are described: 1) lightcurves and densities of small bodies 2) colors of Kuiper belt objects and the distribution of the ultrared matter 3) spectroscopy and the crystallinity of ice in the outer Solar system 4) irregular satellites of the giant planets 5) the Main Belt Comets and 6) comets and meteor stream parents.

David Jewitt

2008-11-14T23:59:59.000Z

308

A Nuclear Iran? Why this particular topic?  

E-Print Network [OSTI]

A Nuclear Iran? #12;#12;Why this particular topic? · State Department internship · Personal · NPT (Nuclear Nonproliferation Treaty) developed after WWII and Japan · IAEA (International Atomic of capacity #12;Iran's nuclear program · Initiated in 1959 · Strong ties to Russia, China and Pakistan · 2002

New Hampshire, University of

309

TOPIC INTRODUCTION Title page Combining Ca2+  

E-Print Network [OSTI]

1 TOPIC INTRODUCTION Title page Combining Ca2+ Imaging with Other Optical Techniques SHORT TITLE: Ca2+ Imaging and Other Optical Techniques Marco Canepari 1,2 , Dejan Zecevic 4 , Kaspar E Vogt 3 Descartes, 75006 Paris, France Address correspondence to: marco.canepari@ujf-grenoble.fr ABSTRACT Ca2

Paris-Sud XI, Université de

310

Hot topics in flavor physics at CDF  

SciTech Connect (OSTI)

Hot topics in flavor physics at CDF are reviewed. Selected results of top, beauty, charm physics and exotic states in about 200 pb{sup -1} data collected by the CDF II detector in p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron are presented.

Jun, Soon Yung; /Carnegie Mellon U.

2005-01-01T23:59:59.000Z

311

Tracking Multiple Topics for Finding Interesting Articles  

SciTech Connect (OSTI)

We introduce multiple topic tracking (MTT) for iScore to better recommend news articles for users with multiple interests and to address changes in user interests over time. As an extension of the basic Rocchio algorithm, traditional topic detection and tracking, and single-pass clustering, MTT maintains multiple interest profiles to identify interesting articles for a specific user given user-feedback. Focusing on only interesting topics enables iScore to discard useless profiles to address changes in user interests and to achieve a balance between resource consumption and classification accuracy. Also by relating a topic's interestingness to an article's interestingness, iScore is able to achieve higher quality results than traditional methods such as the Rocchio algorithm. We identify several operating parameters that work well for MTT. Using the same parameters, we show that MTT alone yields high quality results for recommending interesting articles from several corpora. The inclusion of MTT improves iScore's performance by 9% to 14% in recommending news articles from the Yahoo! News RSS feeds and the TREC11 adaptive filter article collection. And through a small user study, we show that iScore can still perform well when only provided with little user feedback.

Pon, R K; Cardenas, A F; Buttler, D J; Critchlow, T J

2007-02-15T23:59:59.000Z

312

TOPICS IN PHILOSOPHY OF RELIGION: PHENOMENOLOGY  

E-Print Network [OSTI]

1 TOPICS IN PHILOSOPHY OF RELIGION: PHENOMENOLOGY RELS 4700/6700 & PHIL 4690/6690 Instructor introduction to phenomenology with a particular focus on phenomenology of religion. We will be concerned with phenomenology as a philosophical movement beginning with Husserl and continuing to the present that makes claims

Doyle, Robert

313

OPTIMIZATION TOPICS LIST Revised April 2012  

E-Print Network [OSTI]

1 OPTIMIZATION TOPICS LIST Revised April 2012 For Fall 2012 and Spring 2013 we will adopt. Bertsimas and J. Tsitsiklis, Introduction to Linear Optimization, Athena Scientific, 1997 2. M. C. Ferris, O and mixed integer models · Existence of optimal solutions, optimality conditions · Branch and bound methods

Radeloff, Volker C.

314

E-Print Network 3.0 - atoms selected topics Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

topics Search Powered by Explorit Topic List Advanced Search Sample search results for: atoms selected topics Page: << < 1 2 3 4 5 > >> 1 UNIVERSITT Mechatronik Summary: quantum...

315

acari phytoseiidae predar: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic Index First Page Previous Page 1 2 3 4 5 Next Page Last Page Topic Index 21 THE HEMP RUSSET MITE ACULOPS CANNABICOLA (FARKAS, 1960) (ACARI: ERIOPHYOIDEA) FOUND ON CANNABIS...

316

acari tetranychidae colectada: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic Index First Page Previous Page 1 2 3 4 5 Next Page Last Page Topic Index 21 THE HEMP RUSSET MITE ACULOPS CANNABICOLA (FARKAS, 1960) (ACARI: ERIOPHYOIDEA) FOUND ON CANNABIS...

317

apocynaceae alcaloides indolicos: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index First Page Previous Page 1 2 Next Page Last Page Topic Index 21 Hemp dogbane Apocynum cannabinum L. Renewable Energy Websites Summary: a milky sap when...

318

Fractal Dimensions of a Weakly Clustered Distribution and the Scale of Homogeneity  

E-Print Network [OSTI]

Homogeneity and isotropy of the universe at sufficiently large scales is a fundamental premise on which modern cosmology is based. Fractal dimensions of matter distribution is a parameter that can be used to test the hypothesis of homogeneity. In this method, galaxies are used as tracers of the distribution of matter and samples derived from various galaxy redshift surveys have been used to determine the scale of homogeneity in the Universe. Ideally, for homogeneity, the distribution should be a mono-fractal with the fractal dimension equal to the ambient dimension. While this ideal definition is true for infinitely large point sets, this may not be realised as in practice, we have only a finite point set. The correct benchmark for realistic data sets is a homogeneous distribution of a finite number of points and this should be used in place of the mathematically defined fractal dimension for infinite number of points (D) as a requirement for approach towards homogeneity. We derive the expected fractal dimension for a homogeneous distribution of a finite number of points. We show that for sufficiently large data sets the expected fractal dimension approaches D in absence of clustering. It is also important to take the weak, but non-zero amplitude of clustering at very large scales into account. In this paper we also compute the expected fractal dimension for a finite point set that is weakly clustered. Clustering introduces departures in the Fractal dimensions from D and in most situations the departures are small if the amplitude of clustering is small. Features in the two point correlation function, like those introduced by Baryon Acoustic Oscillations (BAO) can lead to non-trivial variations in the Fractal dimensions where the amplitude of clustering and deviations from D are no longer related in a monotonic manner.

J. S. Bagla; Jaswant Yadav; T. R. Seshadri

2008-08-04T23:59:59.000Z

319

Topic 1: IntroductionTopic 1: Introduction What is a Computer?What is a Computer?  

E-Print Network [OSTI]

Topic 1: IntroductionTopic 1: Introduction 1 What is a Computer?What is a Computer? What is Computer Science?What is Computer Science? How do we Solve Problems with aHow do we Solve Problems with a Computer?Computer? #12;What is a Computer?What is a Computer? 2 #12;What is a Computer?What is a Computer

Stephenson, Ben

320

Reading Tea Leaves: How Humans Interpret Topic Models  

E-Print Network [OSTI]

Reading Tea Leaves: How Humans Interpret Topic Models Jonathan Chang Jordan Boyd-Graber Sean, Blei Reading Tea Leaves #12;Topic Models in a Nutshell From an input corpus words to topics Forget Red Light, Green Light: A 2-Tone L.E.D. to Simplify Screens Corpus Chang, Boyd-Graber, Wang, Gerrish

Boyd-Graber, Jordan

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Topics in Biomedical Optics: introduction to the feature issue  

E-Print Network [OSTI]

Topics in Biomedical Optics: introduction to the feature issue Joseph P. Culver,1, * Wolfgang; accepted 25 March 2009; posted 25 March 2009 (Doc. ID 109253); published 30 March 2009 This Applied Optics feature issue on Topics in Biomedical Optics highlights papers presented at the 2008 Biomedical Topical

Larson-Prior, Linda

322

CSCE 6933/5933 Advanced Topics in VLSI Systems  

E-Print Network [OSTI]

is shown. 6-bit ADC has similar structure. Advanced Topics in VLSI Systems 9 #12;Threshold Inverter increases. Advanced Topics in VLSI Systems 10 #12;TIQ Comparator Formed by four cascaded inverters. Provide. Advanced Topics in VLSI Systems 12 #12;Functional Simulation Transient analysis carried out. Ramp generated

Mohanty, Saraju P.

323

International Conference on Frontier Topics in Nanostructures and  

E-Print Network [OSTI]

International Conference on Frontier Topics in Nanostructures and Condensed Matter Theory 1 NCMT:00-8:30 CONFERENCE DINNER #12;International Conference on Frontier Topics in Nanostructures and Condensed Matter... on purpose #12;International Conference on Frontier Topics in Nanostructures and Condensed Matter Theory 3 14

Lennard, William N.

324

Crystal Structure of (+)-[delta]-Cadinene Synthase from Gossypium arboreum and Evolutionary Divergence of Metal Binding Motifs for Catalysis  

SciTech Connect (OSTI)

(+)-{delta}-Cadinene synthase (DCS) from Gossypium arboreum (tree cotton) is a sesquiterpene cyclase that catalyzes the cyclization of farnesyl diphosphate in the first committed step of the biosynthesis of gossypol, a phytoalexin that defends the plant from bacterial and fungal pathogens. Here, we report the X-ray crystal structure of unliganded DCS at 2.4 {angstrom} resolution and the structure of its complex with three putative Mg{sup 2+} ions and the substrate analogue inhibitor 2-fluorofarnesyl diphosphate (2F-FPP) at 2.75 {angstrom} resolution. These structures illuminate unusual features that accommodate the trinuclear metal cluster required for substrate binding and catalysis. Like other terpenoid cyclases, DCS contains a characteristic aspartate-rich D{sup 307}DTYD{sup 311} motif on helix D that interacts with Mg{sub A}{sup 2+} and Mg{sub C}{sup 2+}. However, DCS appears to be unique among terpenoid cyclases in that it does not contain the 'NSE/DTE' motif on helix H that specifically chelates Mg{sub B}{sup 2+}, which is usually found as the signature sequence (N,D)D(L,I,V)X(S,T)XXXE (boldface indicates Mg{sub B}{sup 2+} ligands). Instead, DCS contains a second aspartate-rich motif, D{sup 451}DVAE{sup 455}, that interacts with Mg{sub B}{sup 2+}. In this regard, DCS is more similar to the isoprenoid chain elongation enzyme farnesyl diphosphate synthase, which also contains two aspartate-rich motifs, rather than the greater family of terpenoid cyclases. Nevertheless, the structure of the DCS-2F-FPP complex shows that the structure of the trinuclear magnesium cluster is generally similar to that of other terpenoid cyclases despite the alternative Mg{sub B}{sup 2+} binding motif. Analyses of DCS mutants with alanine substitutions in the D{sup 307}DTYD{sup 311} and D{sup 451}DVAE{sup 455} segments reveal the contributions of these segments to catalysis.

Gennadios, Heather A.; Gonzalez, Veronica; Di Costanzo, Luigi; Li, Amang; Yu, Fanglei; Miller, David J.; Allemann, Rudolf K.; Christianson, David W.; (UPENN); (Cardiff); (UC)

2009-09-11T23:59:59.000Z

325

american freshwater ecoregions: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

??Ecoregions are homogeneous regions delineated by similar associations of geology, climate, soils, land use, and potential natural vegetation. Ecoregions provide a spatial...

326

applied coastal biogeochemical: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: ??The homogenization and replacement of the overburden after mining disrupts rock weathering, soil formation processes, and biogeochemical cycling of elements. The...

327

approximate analytical solution: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

extent. The homogeneous Barrash, Warren 477 Analytical solutions to a hillslope-storage kinematic wave equation for subsurface flow Environmental Sciences and Ecology Websites...

328

approximate analytical solutions: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

extent. The homogeneous Barrash, Warren 477 Analytical solutions to a hillslope-storage kinematic wave equation for subsurface flow Environmental Sciences and Ecology Websites...

329

approximate analytic solutions: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

extent. The homogeneous Barrash, Warren 477 Analytical solutions to a hillslope-storage kinematic wave equation for subsurface flow Environmental Sciences and Ecology Websites...

330

automated database mediation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of database approach + Database Management System (DBMS) + Advantages of Using DBMS + Workers Adam, Salah 239 Mediated Homogenization Quantum Physics (arXiv) Summary:...

331

average observational quantities: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

proposed observationally viable alternative to homogeneous cosmology with smooth dark energy, the timescape cosmology. In the timescape model cosmic acceleration is realized as an...

332

acercamiento proyecto retina: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of light emanating from the squid. By day, the nocturnal squid lies buried in shallow sand flats of many animals inhabiting the homogeneous environment of the ocean water...

333

atmospheric aerosol particle: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

suspension in the fractal fluctuations of vertical wind velocity. The mass or radius (size) distribution for homogeneous suspended atmospheric particulates is expressed as a...

334

atmospheric aerosol particles: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

suspension in the fractal fluctuations of vertical wind velocity. The mass or radius (size) distribution for homogeneous suspended atmospheric particulates is expressed as a...

335

Homogenous charge compression ignition engine having a cylinder including a high compression space  

DOE Patents [OSTI]

The present invention relates generally to the field of homogeneous charge compression engines. In these engines, fuel is injected upstream or directly into the cylinder when the power piston is relatively close to its bottom dead center position. The fuel mixes with air in the cylinder as the power piston advances to create a relatively lean homogeneous mixture that preferably ignites when the power piston is relatively close to the top dead center position. However, if the ignition event occurs either earlier or later than desired, lowered performance, engine misfire, or even engine damage, can result. Thus, the present invention divides the homogeneous charge between a controlled volume higher compression space and a lower compression space to better control the start of ignition.

Agama, Jorge R.; Fiveland, Scott B.; Maloney, Ronald P.; Faletti, James J.; Clarke, John M.

2003-12-30T23:59:59.000Z

336

A cell model for homogenization of fiber-reinforced composites: General theory and nonlinear elasticity effects  

SciTech Connect (OSTI)

The theoretical basis of the homogenization technique developed by Aboudi is presented and assessed. Given the constitutive relations of the constituents, this technique provides an equivalent, homogeneous, constitutive model of unidirectional, continuous-fiber-reinforced composites. The expressions that comprise the first-order version of the technique are given special attention as this treatment has considerable practical value. Nonlinear elasticity effects are added to it. This extension increases the accuracy of numerical simulations of high strain-rate loadings. It is particularly important for any dynamic loading in which shock waves might be produced, including crash safety, armor, and munitions applications. Examples illustrate that elastic nonlinearity can make substantial contributions at strains of only a few per cent. These contributions are greatest during post-yield inelastic deformation. The micromechanics-based homogenization technique is shown to facilitate use of an efficient approximate treatment of elastic nonlinearity in composites with isotropic matrix materials.

Aidun, J.B.; Addessio, F.L.

1995-11-01T23:59:59.000Z

337

Tracking Multiple Topics for Finding Interesting Articles  

SciTech Connect (OSTI)

We introduce multiple topic tracking (MTT) for iScore to better recommend news articles for users with multiple interests and to address changes in user interests over time. As an extension of the basic Rocchio algorithm, traditional topic detection and tracking, and single-pass clustering, MTT maintains multiple interest profiles to identify interesting articles for a specific user given user-feedback. Focusing on only interesting topics enables iScore to discard useless profiles to address changes in user interests and to achieve a balance between resource consumption and classification accuracy. iScore is able to achieve higher quality results than traditional methods such as the Rocchio algorithm. We identify several operating parameters that work well for MTT. Using the same parameters, we show that MTT alone yields high quality results for recommending interesting articles from several corpora. The inclusion of MTT improves iScore's performance by 25% in recommending news articles from the Yahoo! News RSS feeds and the TREC11 adaptive filter article collection. And through a small user study, we show that iScore can still perform well when only provided with little user feedback.

Pon, R K; Cardenas, A F; Buttler, D J; Critchlow, T J

2008-01-03T23:59:59.000Z

338

Future geodesic completeness of some spatially homogeneous solutions of the vacuum Einstein equations in higher dimensions  

E-Print Network [OSTI]

It is known that all spatially homogeneous solutions of the vacuum Einstein equations in four dimensions which exist for an infinite proper time towards the future are future geodesically complete. This paper investigates whether the analogous statement holds in higher dimensions. A positive answer to this question is obtained for a large class of models which can be studied with the help of Kaluza-Klein reduction to solutions of the Einstein-scalar field equations in four dimensions. The proof of this result makes use of a criterion for geodesic completeness which is applicable to more general spatially homogeneous models.

Arne Goedeke; Alan D. Rendall

2010-02-21T23:59:59.000Z

339

Two stroke homogenous charge compression ignition engine with pulsed air supplier  

DOE Patents [OSTI]

A two stroke homogenous charge compression ignition engine includes a volume pulsed air supplier, such as a piston driven pump, for efficient scavenging. The usage of a homogenous charge tends to decrease emissions. The use of a volume pulsed air supplier in conjunction with conventional poppet type intake and exhaust valves results in a relatively efficient scavenging mode for the engine. The engine preferably includes features that permit valving event timing, air pulse event timing and injection event timing to be varied relative to engine crankshaft angle. The principle use of the invention lies in improving diesel engines.

Clarke, John M. (Chillicothe, IL)

2003-08-05T23:59:59.000Z

340

Enhancement of crystal homogeneity of protein crystals under application of an external alternating current electric field  

SciTech Connect (OSTI)

X-ray diffraction rocking-curve measurements were performed on tetragonal hen egg white (HEW) lysozyme crystals grown with and without the application of an external alternating current (AC) electric field. The crystal quality was assessed by the full width at half maximum (FWHM) value for each rocking curve. For two-dimensional maps of the FWHMs measured on the 440 and the 12 12 0 reflection, the crystal homogeneity was improved under application of an external electric field at 1 MHz, compared with that without. In particular, the significant improvement of the crystal homogeneity was observed for the 12 12 0 reflection.

Koizumi, H.; Uda, S.; Fujiwara, K.; Nozawa, J. [Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577 (Japan); Tachibana, M. [Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, 236-0027 (Japan); Kojima, K. [Department of Education, Yokohama Soei University, 1 Miho-tyou, Midori-ku, Yokohama, 226-0015 (Japan)

2014-10-06T23:59:59.000Z

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Determining whether metals nucleate homogeneously on graphite: A case study with copper  

SciTech Connect (OSTI)

We observe that Cu clusters grow on surface terraces of graphite as a result of physical vapor deposition in ultrahigh vacuum. We show that the observation is incompatible with a variety of models incorporating homogeneous nucleation and calculations of atomic-scale energetics. An alternative explanation, ion-mediated heterogeneous nucleation, is proposed and validated, both with theory and experiment. This serves as a case study in identifying when and whether the simple, common observation of metal clusters on carbon-rich surfaces can be interpreted in terms of homogeneous nucleation. We describe a general approach for making system-specific and laboratory-specific predictions.

Appy, David [Ames Laboratory; Lei, Huaping [Ames Laboratory; Han, Yong [Ames Laboratory; Wang, Cai-Zhuang [Ames Laboratory; Tringides, Michael C [Ames Laboratory; Shao, Dahai [Ames Laboratory; Kwolek, Emma J [Iowa State University; Evans, J W [Ames Laboratory; Thiel, P A [Ames Laboratory

2014-11-01T23:59:59.000Z

342

Data-driven Techniques to Estimate Parameters in the Homogenized Energy Model for Shape Memory Alloys  

E-Print Network [OSTI]

, ferroelectric, and ferromagnetic materials. The energy origin of the model was originally investigated for SMA]. The original mod- els determined the equilibrium phase using the Gibbs energy to predict the mesoscopic (orData-driven Techniques to Estimate Parameters in the Homogenized Energy Model for Shape Memory

343

Enhanced HFIR overpower margin through improvements in fuel plate homogeneity inspection  

SciTech Connect (OSTI)

Fuel homogeneity inspection techniques used on the HFIR fuel plates have recently been improved through conversion of the X-ray inspection device to acquire, store, and process data digitally. This paper reports some early results from using the improved equipment and describes future plans for obtaining enhanced fuel thermal performance by exploiting this improved inspection capability.

Rothrock, R.B.; Hale, R.E.; Knight, R.W. [Oak Ridge National Lab., TN (United States); Cheverton, R.D.

1995-09-01T23:59:59.000Z

344

FIRSTORDER CORRECTOR FOR THE HOMOGENIZATION OF THE CRITICALITY EIGENVALUE PROBLEM IN THE EVEN PARITY  

E-Print Network [OSTI]

FIRST­ORDER CORRECTOR FOR THE HOMOGENIZATION OF THE CRITICALITY EIGENVALUE PROBLEM IN THE EVEN of the criticality eigenvalue problem for the even parity flux of neutron transport in a domain with isotropic to determine the power distribution of neutrons in nuclear reactors. In the case of a stable reactor, only

Bal, Guillaume

345

Discovering Homogeneous Regions in Spatial Data through Competition Slobodan Vucetic SVUCETIC@EECS.WSU.EDU  

E-Print Network [OSTI]

Discovering Homogeneous Regions in Spatial Data through Competition Slobodan Vucetic SVUCETIC for the analysis of heterogeneous spatial data is proposed. It is based on partitioning the data set into more. A number of experiments on artificial and real­life spatial data are performed to validate some as­ pects

Obradovic, Zoran

346

Discovering Homogeneous Regions in Spatial Data through Competition Slobodan Vucetic SVUCETIC@EECS.WSU.EDU  

E-Print Network [OSTI]

Discovering Homogeneous Regions in Spatial Data through Competition Slobodan Vucetic SVUCETIC, a supervised machine learning algorithm for the analysis of heterogeneous spatial data is proposed. It is based and accuracy is discussed. A number of experiments on artificial and real-life spatial data are performed

Vucetic, Slobodan

347

The evolution of a spatially homogeneous and isotropic universe filled with a collisionless gas  

E-Print Network [OSTI]

We review the evolution of a spatially homogeneous and isotropic universe described by a Friedmann-Robertson-Walker spacetime filled with a collisionless, neutral, simple, massive gas. The gas is described by a one-particle distribution function which satisfies the Liouville equation and is assumed to be homogeneous and isotropic. Making use of the isometries of the spacetime, we define precisely the homogeneity and isotropicity property of the distribution function, and based on this definition we give a concise derivation of the most general family of such distribution functions. For this family, we construct the particle current density and the stress-energy tensor and consider the coupled Einstein-Liouville system of equations. We find that as long as the distribution function is collisionless, homogenous and isotropic, the evolution of a Friedmann-Robertson-Walker universe exhibits a singular origin. Its future development depends upon the curvature of the spatial sections: spatially flat or hyperboloid universes expand forever and this expansion dilutes the energy density and pressure of the gas, while a universe with compact spherical sections reaches a maximal expansion, after which it reverses its motion and recollapses to a final crunch singularity where the energy density and isotropic pressure diverge. Finally, we analyze the evolution of the universe filled with the collisionless gas once a cosmological constant is included.

Francisco Astorga; Olivier Sarbach; Thomas Zannias

2014-06-14T23:59:59.000Z

348

DOI: 10.1002/cssc.201000142 Homogeneous Oxidation Reactions of Propanediols at Low  

E-Print Network [OSTI]

are consistent with chain propagation processes mediated by oxygen-containing radicals. The high acrolein selectivity in homogeneous 1,3-propane- diol oxidation led us to introduce the acrolein and H2O formed acrolein into acrylic acid with 90% yields (based on propanediol reactants). This com- bined process

Iglesia, Enrique

349

The Condensate Equation for non-homogeneous Andre F. Verbeure1  

E-Print Network [OSTI]

The Condensate Equation for non-homogeneous Bosons Andr´e F. Verbeure1 Institute for Theoretical)-condensation. This phe- nomenon is accompanied with spontaneous breaking of the translation symmetry down of the condensate equation for these systems. We discuss model applications. KEY WORDS: Bose- Einstein condensation

350

Finite order polynomial moment solutions of the homogeneous Grad-Shafranov equation  

SciTech Connect (OSTI)

A method for generating the finite positive order polynomial moment solutions of the homogeneous Grad-Shafranov equation to arbitrary order and the explicit form of the first few moments are given. A criticism of the method is discussed, and several practical examples are given.

Reusch, M.F.; Neilson, G.H.

1984-02-01T23:59:59.000Z

351

Detailed Analysis and Control Issues of Homogeneous Charge Compression Ignition (HCCI)  

SciTech Connect (OSTI)

Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NOx and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work.

Aceves, Salvador M.; Flowers, Daniel L.; Martinez-Frias, Joel; Espinosa-Loza, Francisco; Dibble, Robert

2002-08-25T23:59:59.000Z

352

Dynamics of Homogeneous Charge Compression Ignition (HCCI) Engines with High Dilution  

E-Print Network [OSTI]

Dynamics of Homogeneous Charge Compression Ignition (HCCI) Engines with High Dilution C. J. Chiang (HCCI) engines in light of the cycle-to-cycle thermal feedback due to the high percentage of exhaust temperature is the primary mechanism for con- trolling ignition timing in an HCCI engine, especially when

Stefanopoulou, Anna

353

Sensitivity Analysis of Combustion Timing and Duration of Homogeneous Charge Compression Ignition (HCCI) Engines  

E-Print Network [OSTI]

(HCCI) Engines C. J. Chiang and A. G. Stefanopoulou University of Michigan, Ann Arbor Email: cjchiang of a Homogeneous Charge Com- pression Ignition (HCCI) engine. Qualitative and quantitative information on the individual effects of fuel and exhaust gas recirculation (EGR) on the HCCI combustion is provided. Using

Stefanopoulou, Anna

354

Spatial homogenization of thermal feedback regions in Monte Carlo reactor calculations  

SciTech Connect (OSTI)

An integrated thermal-hydraulic feedback module has previously been developed for the Monte Carlo transport solver, MC21. The module incorporates a flexible input format that allows the user to describe heat transfer and coolant flow paths within the geometric model at any level of spatial detail desired. The effect that the varying levels of spatial homogenization of thermal regions has on the accuracy of the Monte Carlo simulations is examined in this study. Six thermal feedback mappings are constructed from the same geometric model of the Calvert Cliffs core. The spatial homogenization of the thermal regions is varied, giving each scheme a different level of detail, and the adequacy of the spatial homogenization is determined based on the eigenvalue produced by each Monte Carlo calculation. The purpose of these numerical experiments is to determine the level of detail necessarily to accurately capture the thermal feedback effect on reactivity. Several different core models are considered: axial-flow only, axial and lateral flow, asymmetry due to control rod insertion, and fuel heating (temperature -dependent cross sections). The thermal results generated by the MC21 thermal feedback module are consistent with expectations. Based upon the numerical experiments conducted it is concluded that the amount of spatial detail necessary to accurately capture the feedback effect on reactivity is relatively small. Homogenization at the assembly level for the Calvert Cliffs PWR model results in a similar power defect to that calculated with individual pin-cells modeled as explicit thermal regions. (authors)

Hanna, B. R.; Gill, D. F.; Griesheimer, D. P. [Bertis Atomic Power Laboratory, Bechtel Marine Propulsion Corporation, P.O. Box 79, West Mifflin, PA 15122 (United States)

2012-07-01T23:59:59.000Z

355

Security-Aware Resource Allocation for Real-Time Parallel Jobs on Homogeneous  

E-Print Network [OSTI]

processing systems [2], med- ical electronics [9], aircraft control [1], and scientific parallel computing [6 a system framework, security overhead, and parallel applications with deadline and security constraintsSecurity-Aware Resource Allocation for Real-Time Parallel Jobs on Homogeneous and Heterogeneous

Qin, Xiao

356

ASSESSING THE LIQUEFACTION RISK REDUCTION OF REINFORCED SOILS: A HOMOGENIZATION APPROACH  

E-Print Network [OSTI]

liquefaction risk reduction factor. Then section 4 develops the same evaluation for a cross trench reinforcedASSESSING THE LIQUEFACTION RISK REDUCTION OF REINFORCED SOILS: A HOMOGENIZATION APPROACH Maxime for the reduction of the liquefaction risk, which can be expected from reinforcing the soil by a periodic array

Paris-Sud XI, Université de

357

FAST AND ROBUST NUMERICAL SOLUTION OF THE RICHARDS EQUATION IN HOMOGENEOUS SOIL  

E-Print Network [OSTI]

kr(#(p))(#p - z) in case of a homogeneous soil. Here, p is the unknown water or capillary pressure on# Ã? (0, T ) for a time T > 0 and a domain# # R 3 inhibited by the porous medium. The porosity.e., these parameter functions are fixed on# and describe the relationships in a single soil only. Concrete forms

Kornhuber, Ralf

358

FAST AND ROBUST NUMERICAL SOLUTION OF THE RICHARDS EQUATION IN HOMOGENEOUS SOIL  

E-Print Network [OSTI]

) in case of a homogeneous soil. Here, p is the unknown water or capillary pressure on Ã? (0, T ) for a time T > 0 and a domain R3 inhibited by the porous medium. The porosity and the hydraulic conductivity the relationships in a single soil only. Concrete forms of these functions have been given by Brooks and Corey [13

Kornhuber, Ralf

359

ELECTRICAL IMPEDANCE MAMMOGRAPHY Forward problem for homogeneous and 3-D sphere  

E-Print Network [OSTI]

ELECTRICAL IMPEDANCE MAMMOGRAPHY Forward problem for homogeneous and 3-D sphere Jakub Vel Prague, October 15, 2014 J. Vel´imsk´y (CUP) Electrical Impedance Mammography Prague, 15.10.2014 1 / 26 and SH-FE discretization Remarks on the inverse problem Current status J. Vel´imsk´y (CUP) Electrical

Cerveny, Vlastislav

360

Statistical fracture modeling: crack path and fracture criteria with application to homogeneous and  

E-Print Network [OSTI]

Statistical fracture modeling: crack path and fracture criteria with application to homogeneous; accepted 23 January 2002 Abstract Analysis has been performed on fracture initiation near a crack in a brittle material with strength described by Weibull statistics. This nonlocal fracture model allows

Ritchie, Robert

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361

Homogeneous Decomposition Mechanisms of Diethylzinc by Raman Spectroscopy and Quantum Chemical Calculations  

E-Print Network [OSTI]

for direct reaction products in an inverted, impinging-jet test reactor coupled to a Raman spectrometer. The homogeneous thermal decomposition of DEZn in N2 carrier was followed in an impinging-jet, up-flow reactor vibrational frequencies of DEZn, as well as anticipated intermediates and products. Comparison of the measured

Anderson, Timothy J.

362

Single-Step Assembly of Homogenous Lipid Polymeric and Lipid Quantum  

E-Print Network [OSTI]

Single-Step Assembly of Homogenous Lipid Polymeric and Lipid Quantum Dot Nanoparticles Enabled shown that hybrid lipid polymeric NPs combine the desir- able characteristics of polymeric NPs by entrapping one agent in the lipid envelope and the other one in the polymeric core.5 The development of novel

Zhang, Liangfang

363

Projective re-normalization for improving the behavior of a homogeneous conic linear system  

E-Print Network [OSTI]

In this paper we study the homogeneous conic system F : Ax = 0, x ? C \\ {0}. We choose a point ¯s ? intC? that serves as a normalizer and consider computational properties of the normalized system F¯s : Ax = 0, ¯sT x = 1, ...

Belloni, Alexandre

364

Optimal Homogenization of Perfusion Flows in Microfluidic Bio-Reactors: A Numerical Study  

E-Print Network [OSTI]

Optimal Homogenization of Perfusion Flows in Microfluidic Bio-Reactors: A Numerical Study Fridolin of Denmark, DTU Nanotech, Kongens Lyngby, Denmark Abstract In recent years, the interest in small-scale bio-reactors microfluidic bio-reactors, we develop a general design of a continually feed bio- reactor with uniform

365

DRIVING FORCE FOR THE ELECTROMIGRATION OF AN IMPURITY IN A HOMOGENEOUS METAL  

E-Print Network [OSTI]

:01976003702015900 #12;160 electron impurity interaction, and (ii) to show that the electrostatic force vanishes159 DRIVING FORCE FOR THE ELECTROMIGRATION OF AN IMPURITY IN A HOMOGENEOUS METAL L. TURBAN (*), P as the flux of electric charge associated with a unit flux of the solute is shown to be equivalent

Boyer, Edmond

366

Microfluidic Assembly of Homogeneous and Janus Colloid-Filled Hydrogel Granules  

E-Print Network [OSTI]

Microfluidic Assembly of Homogeneous and Janus Colloid-Filled Hydrogel Granules Robert F. Shepherd 23234 ReceiVed March 21, 2006. In Final Form: August 15, 2006 The microfluidic assembly of colloid.11 A new route to granulation is suggested by the emergence of microfluidic techniques that allow

Lewis, Jennifer

367

Phenomenology for the decay of energy-containing eddies in homogeneous MHD turbulence  

E-Print Network [OSTI]

Phenomenology for the decay of energy-containing eddies in homogeneous MHD turbulence Murshed of simple, one-point phenomenological models for the decay of energy-containing eddies phenomenology has been previously verified against experiments in wind tunnels, and certain experimentally

Oughton, Sean

368

Optimization of the structural Gabor functions in a homogeneous velocity model  

E-Print Network [OSTI]

Optimization of the structural Gabor functions in a homogeneous velocity model for a zero-o#11;set functions should be optimized, and the Gabor functions should form a frame. We present a simple attempt functions and the space{wavenumber lattice of their central points are optimized analytically

Cerveny, Vlastislav

369

A Harmonic Approach for Calculating Daily Temperature Normals Constrained by2 Homogenized Monthly Temperature Normals3  

E-Print Network [OSTI]

1 1 A Harmonic Approach for Calculating Daily Temperature Normals Constrained by2 Homogenized a constrained harmonic technique that forces the daily30 temperature normals to be consistent with the monthly, or harmonic even though the annual march of temperatures for some locations can be highly asymmetric. Here, we

370

Preprint version -March 7, 2006 REITERATED HOMOGENIZATION OF A CAVITATION PROBLEM  

E-Print Network [OSTI]

Preprint version - March 7, 2006 REITERATED HOMOGENIZATION OF A CAVITATION PROBLEM IN THIN FILMS theory: cavitation phenomena and roughness of the surfaces in relative motion: cavitation is defined to describe the behavior of a viscous cavitated flow in the lubrication framework. However, in practical

Paris-Sud XI, Université de

371

Homogeneity of precipitation series in the Netherlands and their trends in the past century  

E-Print Network [OSTI]

1 Homogeneity of precipitation series in the Netherlands and their trends in the past century T. A. Buishand, G. De Martino, J.N. Spreeuw and T. Brandsma Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands ABSTRACT: The historical daily precipitation observations for the Netherlands

Brandsma, Theo

372

Homogeneous Bottleneck Model of Matrix-assisted Ultraviolet Laser Desorption of  

E-Print Network [OSTI]

Akos Vertes", R. Gijbels Department of Chemistry, University of Antwerp (UIA), Universiteitsplein 1, B volatilization are examined in a simple model. The key material factors appear to be a low heat of sublimation to the sublimation induction period. The model is homogeneous in that the energy density is taken to be uniform

Vertes, Akos

373

Rate constants for the homogeneous gas-phase Al/HCl combustion chemistry  

E-Print Network [OSTI]

Rate constants for the homogeneous gas-phase Al/HCl combustion chemistry Mark T. Swiharta Engineering, University at Buffalo (SUNY), Buffalo, NY 14260-4200, USA b Laboratoire de Combustion et Syste Orleans cedex 2, France c Laboratoire de Combustion et Syste`mes Re´actifs (LCSR), CNRS, 1C, av. de la

Swihart, Mark T.

374

Coal Segregation Control for Meeting Homogeneity Z. Huang, R. Kumar J. Yingling, J. Sottile  

E-Print Network [OSTI]

Coal Segregation Control for Meeting Homogeneity Standards Z. Huang, R. Kumar J. Yingling, J were developed to control coal segre- gation to meet ash targets over large coal batches (e. g., a unit train of coal) while realizing high yields and economic savings. We have extended this work to address

Kumar, Ratnesh

375

Topic A Note: Includes STEPS Subtopic  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7 th ,Top Value Added Chemicals fromTopic A

376

Topic A Awardee: Eastern Interconnection Planning Collaborative |  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7 th ,Top Value Added Chemicals fromTopic

377

Hot Topic Workshop | Photosynthetic Antenna Research Center  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFun withconfinement plasmas inPortalAll NERSC userNewhighDiff-Topic Workshop

378

Technical Assistance Topics | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGYWomenthe House Committee on EnergyEnergy Secretary ChuAs OfficeEricOnTopics

379

Property:ProgramTopics | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revisionEnvReviewNonInvasiveExploration Jump to:FieldProceduresFY Description URLsEndDateCPrimaryProgramTopics

380

DOE Transportation Protocols Topic Group Conference Call Summary...  

Broader source: Energy.gov (indexed) [DOE]

Conference Call Summary May 13, 1999 The Transportation External Coordination Working Group (TECWG) Protocols Topic Group held a conference call on May 13, 1999, to discuss the...

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381

accessory left atrial: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

23 24 25 Next Page Last Page Topic Index 401 PREDICTION OF REMAINING LIFE OF POWER TRANSFORMERS BASED ON LEFT TRUNCATED AND RIGHT Mathematics Websites Summary: PREDICTION OF...

382

ardley island antarctica: Topics by E-print Network  

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images were used to convey information about diverse planetary resources including food, energy, and minerals. Each topic was presented with overarching authority, in a myriad of...

383

american planning association: Topics by E-print Network  

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Page Topic Index 1 Associate at the American Planning Association. Planning for Solar Energy CiteSeer Summary: There is a growing desire among communities to become more...

384

automotive structural composites: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 1 Mechanistic Effects of Porosity on Structural Composite Materials. Open Access Theses and Dissertations Summary: ??As fiber reinforced composites...

385

aligned single wall: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 1 Printed Multilayer Superstructures of Aligned Single-Walled Carbon Materials Science Websites Summary: Printed Multilayer Superstructures of Aligned...

386

advanced composites production: Topics by E-print Network  

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Next Page Last Page Topic Index 1 ULTRASONIC CHARACTERIZATION OF ADVANCED COMPOSITE MATERIALS CiteSeer Summary: With increased use of composite materials in critical structural...

387

automotive structural composite: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 1 Mechanistic Effects of Porosity on Structural Composite Materials. Open Access Theses and Dissertations Summary: ??As fiber reinforced composites...

388

advanced composite material: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Next Page Last Page Topic Index 1 ULTRASONIC CHARACTERIZATION OF ADVANCED COMPOSITE MATERIALS CiteSeer Summary: With increased use of composite materials in critical structural...

389

advanced composite aileron: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Next Page Last Page Topic Index 1 ULTRASONIC CHARACTERIZATION OF ADVANCED COMPOSITE MATERIALS CiteSeer Summary: With increased use of composite materials in critical structural...

390

aluminum matrix composite: Topics by E-print Network  

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Topic Index 1 Joining of 6061 Aluminum Matrix-Ceramic Particle Reinforced Composites Materials Science Websites Summary: ) ) Joining of 6061 Aluminum Matrix-Ceramic Particle...

391

aligned carbon nitride: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

22 23 24 25 Next Page Last Page Topic Index 1 Carbon Nitride and Conjugated Polymer Composite Materials. Open Access Theses and Dissertations Summary: ??The semiconductor and...

392

advanced ultrasonic methods: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Next Page Last Page Topic Index 1 ULTRASONIC CHARACTERIZATION OF ADVANCED COMPOSITE MATERIALS CiteSeer Summary: With increased use of composite materials in critical structural...

393

affecting calcium oxalate: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

note on oxalic acid by topical application for the control June 1997; accepted 7 October 1997) oxalic acid varroosis honeybee honey residues Tests on the use of...

394

administration inhalation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 21 Toxic Inhalation Fatalities of US Construction Workers, 1990 to 1999 Multidisciplinary Databases and Resources Websites Summary: space standard could save...

395

alternative pathway responsible: Topics by E-print Network  

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23 24 25 Next Page Last Page Topic Index 1 Questioning Inevitability of Energy Pathways: Alternative Energy Scenarios for California Renewable Energy Websites Summary: Questioning...

396

alternative pathway mediates: Topics by E-print Network  

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23 24 25 Next Page Last Page Topic Index 1 Questioning Inevitability of Energy Pathways: Alternative Energy Scenarios for California Renewable Energy Websites Summary: Questioning...

397

alosa immaculata bennet: Topics by E-print Network  

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alosa immaculata bennet First Page Previous Page 1 2 3 4 5 Next Page Last Page Topic Index 1 BENNET MARBURGER ,HOCHAUSENTWURF Energy Storage, Conversion and Utilization Websites...

398

altered anxiety behavior: Topics by E-print Network  

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24 25 Next Page Last Page Topic Index 1 Transgenerational Epigenetic Programming of the Brain Transcriptome and Anxiety Behavior Environmental Sciences and Ecology Websites...

399

adult hippocampal neurogenesis: Topics by E-print Network  

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Page Topic Index 1 Thyroid hormone regulates hippocampal neurogenesis in the adult rat brain Biology and Medicine Websites Summary: Thyroid hormone regulates hippocampal...

400

anatomically modern humans: Topics by E-print Network  

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Last Page Topic Index 1 HIERARCHICAL TOPOLOGICAL NETWORK ANALYSIS OF ANATOMICAL HUMAN BRAIN CONNECTIVITY AND Mathematics Websites Summary: HIERARCHICAL TOPOLOGICAL NETWORK...

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401

anatomical connectivity reveals: Topics by E-print Network  

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20 21 22 23 24 25 Next Page Last Page Topic Index 1 A probabilistic framework to infer brain functional connectivity from anatomical Physics Websites Summary: A probabilistic...

402

adolescent treatment sample: Topics by E-print Network  

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Last Page Topic Index 1 Inpatient Treatment for Children and Adolescents with Substance Abuse Issues University of Kansas - KU ScholarWorks Summary: drinking in the previous 2...

403

artrite reumatoide juvenil: Topics by E-print Network  

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Page Last Page Topic Index 321 OBSERVATIONS ON JUVENILE OCEANIC SKIPJACK (KATSUWONUS PELAMIS) FROM Environmental Sciences and Ecology Websites Summary: of the ventral fins. There...

404

arrestin fold variations: Topics by E-print Network  

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25 Next Page Last Page Topic Index 1 Variational theory for site resolved protein folding free energy surfaces Condensed Matter (arXiv) Summary: We present a microscopic...

405

autonomous global sky: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

suit. However, when dealing with astronomy - a topic so seemingly far removed from society - it becomes difficult to imagine any links with global citizenship. At Nottingham...

406

Preliminary Fuel Cell Manufacturing R&D Topics  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

research topics subject to revision prior to a solicitation being issued May 18, 2007 FUEL CELL MANUFACTURING R & D Presently, Polymer Electrolyte Membrane (PEM) fuel cell stacks...

407

TEC Working Group Topic Groups Rail Key Documents Radiation Monitoring...  

Broader source: Energy.gov (indexed) [DOE]

Radiation Monitoring Subgroup TEC Working Group Topic Groups Rail Key Documents Radiation Monitoring Subgroup Radiation Monitoring Subgroup Draft Work Plan - February 4, 2008 More...

408

TEC Working Group Topic Groups Rail Conference Call Summaries...  

Broader source: Energy.gov (indexed) [DOE]

Radiation Monitoring Subgroup TEC Working Group Topic Groups Rail Conference Call Summaries Radiation Monitoring Subgroup Radiation Monitoring Subgroup October 11, 2007 More...

409

ad libitum lunch: Topics by E-print Network  

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Atkinson Center for a Sustainable Future topical lunch summary Title: "The Future of Fracking: Transparency, Waste Production and Disposal, Regional Renewable Energy Websites...

410

atlas christmas lunch: Topics by E-print Network  

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Atkinson Center for a Sustainable Future topical lunch summary Title: "The Future of Fracking: Transparency, Waste Production and Disposal, Regional Renewable Energy Websites...

411

aij projects methodology: Topics by E-print Network  

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Last Page Topic Index 1 A New Project Execution Methodology; Integrating Project Management Principles with Quality Project Execution Methodologies University of Kansas - KU...

412

acinetobacter baumannii infection: Topics by E-print Network  

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25 Next Page Last Page Topic Index 1 Diversity of acinetobacter baumannii isolates from Egypt Edinburgh, University of - Research Archive Summary: Acinetobacter baumannii is an...

413

acinetobacter baumannii infections: Topics by E-print Network  

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25 Next Page Last Page Topic Index 1 Diversity of acinetobacter baumannii isolates from Egypt Edinburgh, University of - Research Archive Summary: Acinetobacter baumannii is an...

414

audi s8 maserati: Topics by E-print Network  

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physics topics at the Large Hadron Collider (LHC), for instance searches for muonic Higgs boson decays or new phenomena, or measurements of the standard model (SM) processes like...

415

al suelo para: Topics by E-print Network  

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Last Page Topic Index 1 Semirido: un desafo para la CienciaSemirido: un desafo para la Ciencia del Suelodel Suelo Environmental Sciences and Ecology Websites Summary: Semirido:...

416

alta frecuencia una: Topics by E-print Network  

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Page Topic Index 1 Computacion de Altas Prestaciones, una herramienta en ayuda de la ciencia Computer Technologies and Information Sciences Websites Summary: Computacion de...

417

antarctic impulsive transient: Topics by E-print Network  

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Next Page Last Page Topic Index 1 The Antarctic Impulsive Transient Antenna Ultra-high Energy Neutrino Detector Design, Performance, and Sensitivity for 2006-2007 Balloon Flight...

418

abandoned wells: Topics by E-print Network  

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Websites Summary: Do Well, Be Well with Diabetes Do Well, Be Well with Diabetes Lesson Topics WhatisDiabetes? Nutrition-FirstSteptoDiabetesManagement...

419

abandoning wells working: Topics by E-print Network  

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Websites Summary: Do Well, Be Well with Diabetes Do Well, Be Well with Diabetes Lesson Topics WhatisDiabetes? Nutrition-FirstSteptoDiabetesManagement...

420

acoustic 4f imaging: Topics by E-print Network  

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24 25 Next Page Last Page Topic Index 1 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...

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421

artificial lighting good: Topics by E-print Network  

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24 25 Next Page Last Page Topic Index 1 Adaptive predictive lighting controllers for daylight artificial light integrated schemes. Open Access Theses and Dissertations Summary:...

422

al gen env: Topics by E-print Network  

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Renaissance AL Massachusetts at Amherst, University of 7 ENVE 415 HYDROLOGY TOPIC SYLLABUS Engineering Websites Summary: Chapters 4, 14 Watershed Delineation, Characteristics...

423

apoyo social entre: Topics by E-print Network  

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20 21 22 23 24 25 Next Page Last Page Topic Index 1 ENTR 406: SOCIAL ENTREPRENEURSHIP Syllabus Fall, 2013 Mathematics Websites Summary: ENTR 406: SOCIAL ENTREPRENEURSHIP Syllabus...

424

amyloidogenic light chain: Topics by E-print Network  

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Page Topic Index 21 Side-chain functionalized luminescent polymers for organic light-emitting diode applications. Open Access Theses and Dissertations Summary: ??This thesis aims...

425

albicans siluriformes pimelodidae: Topics by E-print Network  

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albicans siluriformes pimelodidae First Page Previous Page 1 2 3 4 5 Next Page Last Page Topic Index 1 Sistemtica e Filogeografia de Pimelodus blochii (Siluriformes: Pimelodidae)...

426

assessment program final: Topics by E-print Network  

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25 Next Page Last Page Topic Index 1 Stanford Geothermal Program Final Report Renewable Energy Websites Summary: Linear Programming1 Stanford Geothermal Program Final Report July...

427

alcohol ingestion exacerbates: Topics by E-print Network  

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25 Next Page Last Page Topic Index 1 Alcoholism and Strongyloides stercoralis: Daily Ethanol Ingestion Has a Positive Correlation with the Frequency of Strongyloides Larvae in...

428

assessing biodiversity management: Topics by E-print Network  

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24 25 Next Page Last Page Topic Index 281 Density Management In Pacific Northwest Forests Renewable Energy Websites Summary: lands Emphasis on managing for biodiversity and...

429

avati rakvere kesklinna: Topics by E-print Network  

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First Page Previous Page 1 Next Page Last Page Topic Index 1 Successful biomass (wood pellets ) implementation in Renewable Energy Websites Summary: of primary energy in Estonia ...

430

Small Business Innovation Research (SBIR) FY 2014 Phase I topics...  

Broader source: Energy.gov (indexed) [DOE]

Selected topic and subtopics contained in this document are designated as Technology Transfer Opportunities (TTOs). sbirtopics10-28-13.pdf More Documents & Publications...

431

aminoglycoside resistance genes: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 1 Aminoglycoside resistance in clinical Gram-negative isolates from Norway . Open Access Theses and Dissertations Summary: ??Aminoglycosides represent an...

432

aivo lepland atko: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic Index 1 Sedimentation and chronology of heavy metal pollution in Oslo harbor, Norway Aivo Lepland a,*, Thorbjrn J. Andersen b Geosciences Websites Summary: backscatter and...

433

aivo lepland tiit: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic Index 1 Sedimentation and chronology of heavy metal pollution in Oslo harbor, Norway Aivo Lepland a,*, Thorbjrn J. Andersen b Geosciences Websites Summary: backscatter and...

434

argentinas del virus: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Multiplicador del gasto pblico en Argentina. Open Access Theses and Dissertations Summary: ??Este trabajo proporciona por...

435

argentinas sobre bacterias: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Multiplicador del gasto pblico en Argentina. Open Access Theses and Dissertations Summary: ??Este trabajo proporciona por...

436

advanced digestive endoscopy: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

sets are topics of research. Virtual endoscopy is a promising new technique to explore hollow organs and anatomical cavities. The fields of application are manifold... Anna...

437

augmented osteoclast phenotype: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 221 Survey and evaluation of techniques to augment convective heat transfer MIT - DSpace Summary: This report presents a survey and evaluation of the...

438

aus forschung und: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 81 Aktuelle nationale und internationale Anwendungsbeispiele aus dem Car-Sharing. Open Access Theses and Dissertations Summary: ??Die vorliegende Arbeit gibt...

439

antiparticle spectrometer gaps: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Next Page Last Page Topic Index 1 The General Antiparticle Spectrometer (GAPS) - Hunt for dark matter using low-energy antideuterons CERN Preprints Summary: The GAPS experiment is...

440

accreting white dwarf: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 1 Accreting White Dwarfs Astrophysics (arXiv) Summary: Thermonuclear (type Ia) supernovae are explosions in accreting white dwarfs, but the exact...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

accreting white dwarfs: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 1 Accreting White Dwarfs Astrophysics (arXiv) Summary: Thermonuclear (type Ia) supernovae are explosions in accreting white dwarfs, but the exact...

442

allikmets triin parik: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

triin parik First Page Previous Page 1 Next Page Last Page Topic Index 1 REVIEWER ACKNOWLEDGEMENT Open Access Reviewer acknowledgement 2013 Computer Technologies and Information...

443

anaerovirgula multivorans gen: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 1 Nickel and cadmium ions inhibit quorum sensing and biofilm formation without affecting viability in Burkholderia multivorans Environmental Management...

444

adipose tissue mitochondria: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

25 Next Page Last Page Topic Index 1 Factors controlling brown adipose tissue development D. RICQUIER, G. MORY, F. BOUILLAUD, Michle COMBES-GEORGE Computer Technologies and...

445

amacrine cell production: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 81 Production CiteSeer Summary: There are serious concerns about the greenhouse gas (GHG) emissions, energy and nutrient and water use efficiency of...

446

alcohol control policies: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

23 24 25 Next Page Last Page Topic Index 1 Revised.Approved.February 2013. 1 Alcohol Policy Policy Name: Carleton University Alcohol Policy Computer Technologies and Information...

447

alcohol pricing policies: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

23 24 25 Next Page Last Page Topic Index 1 Revised.Approved.February 2013. 1 Alcohol Policy Policy Name: Carleton University Alcohol Policy Computer Technologies and Information...

448

The Literature Search Process: An Overview 1. Define your topic.  

E-Print Network [OSTI]

for eradicating Helicobacter pylori? Patient Description Intervention Comparison Intervention Expected Outcome Eradicating Helicobacter pylori Defining your topic with a specific question will make it easier to formulate

Abolmaesumi, Purang

449

adenocarcinoma bronchiolo-alveolar: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Previous Page 1 2 3 4 5 6 7 8 9 Next Page Last Page Topic Index 41 ??? ??? Helicobacter pylori ?? MALT ??? ??? ??? ??? ???...

450

african cichlid fishes: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 1 Somatostatin Regulates Aggressive Behavior in an African Cichlid Fish Biology and Medicine Websites Summary: be- havioral states. In the African cichlid fish...

451

anwr northeastern alaska: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

24 25 Next Page Last Page Topic Index 1 Late Pleistocene and Holocene glaciation of the Fish Lake valley, northeastern Alaska Range, Geosciences Websites Summary: in the...

452

artificial hip joint: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

24 25 Next Page Last Page Topic Index 1 School of Architecture, Design and the Built Environment Project Title: Artificial bone for prosthetic hip joints Computer Technologies and...

453

adjunctive peritoneal resuscitation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 41 Peter J. Regan Adjunct Professor of Business Administration Engineering Websites Summary: in pharmaceutical industry R&D project evaluation and...

454

alto risco gestacional: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 328 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

455

alto riesgo psicosocial: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 294 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

456

alto contenido proteico: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 312 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

457

alto tirreno cosentino: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 266 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

458

alto cuilo concession: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 360 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

459

altos flujos termicos: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 302 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

460

alto valor agregado: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 353 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

alto rendimiento observando: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 292 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

462

alto ribeira petar: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 305 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

463

altos defectos refractivos: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 263 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

464

alto grau hsil: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 372 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

465

alto nivel ranr: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

World Scientific Publishing Company POLYNOMIAL-SIZE NONOBTUSE TRIANGULATION OF POLYGONS MARSHALL BERN Eppstein, David 347 498 IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM...

466

af psoriasis og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

467

af fisk og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

468

af interaktion og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

469

af opholdstid og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

470

af landgilde og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

471

af frakturer og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

472

af doedelighed og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

473

af stordrifts og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

474

af diabetesskole og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

475

af indkaldelse og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

476

af calcium og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

477

af quantiferon og: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Preprocessering og postprocessering af PET billeder Computer Technologies and Information Sciences Websites Summary: Del III...

478

attenuated animal viral: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

25 Next Page Last Page Topic Index 1 Atlas-based attenuation correction for small animal PETMRI scanners Abhijit J. Chaudhari, ajchaudhari@ucdavis.edu, Biology and Medicine...

479

actinide zintl ion: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 101 Instrumentation development for coupling ionion reactions and ion mobility in biological mass spectrometry. Open Access Theses and Dissertations Summary:...

480

algunas consideraciones acerca: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

12 13 14 Next Page Last Page Topic Index 41 Acerca de la UNAM Sitios web UNAM Institutos investigacion Institutos de Investigacin Cientfica Biology and Medicine Websites Summary:...

Note: This page contains sample records for the topic "topics catalysis homogeneous" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

alta presion para: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 61 HERRAMIENTAS PARA REALIZAR UNA INVESTIGACION Geosciences Websites Summary: ......

482

aplicabilidad para detectar: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 21 HERRAMIENTAS PARA REALIZAR UNA INVESTIGACION Geosciences Websites Summary: ......

483

Hanford Advisory Board Draft Advice Topic: In-trench Macroencapsulatio...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic: In-trench Macroencapsulation of Waste at the Environmental Restoration Disposal Facility Authors: Bloom, Cimon, Hudson, Vanni, Pollet and Leckband Originating Committee:...

484

acids suppresses diethylnitrosamine-induced: Topics by E-print...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Topic Index 1 Suppression of rice methane emission by sulfate deposition in simulated acid rain Geosciences Websites Summary: from rice agriculture. Emissions from rice plants...

485

assembly storage facility: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 1 Temporary (mobile) storage testing facilities Renewable Energy Websites Summary: Temporary (mobile) storage testing facilities Permanent storage...

486

ant colony algorithm: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

22 23 24 25 Next Page Last Page Topic Index 1 Learning Fuzzy Rules Using Ant Colony Optimization Algorithms 1 Computer Technologies and Information Sciences Websites Summary:...

487

adaptive particle swarm: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 1 An Adaptive Learning Particle Swarm Optimizer for Function Optimization Computer Technologies and Information Sciences Websites Summary: An Adaptive...

488

augmented lagrangian method: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 1 Augmented Lagrangian method with nonmonotone penalty ... Optimization Online Summary: Jun 21, 2010 ... possibility of failure of the box-constraint...

489

adjoint variable method: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

24 25 Next Page Last Page Topic Index 1 Enhancement of Adjoint Design Methods via Optimization of Adjoint Parameters Engineering Websites Summary: theory to Aerodynamic Shape...

490

asynchronous particle swarm: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

22 23 24 25 Next Page Last Page Topic Index 1 Parallel asynchronous particle swarm optimization CiteSeer Summary: The high computational cost of complex engineering optimization...

491

algorithm na ordenacao: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

21 22 23 24 25 Next Page Last Page Topic Index 1 Elementary algorithms for convex optimization Javier Pena Computer Technologies and Information Sciences Websites Summary: ....

492

aerodynamic response approximation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 1 Managing Approximate Models in Evolutionary Aerodynamic Design Optimization Computer Technologies and Information Sciences Websites Summary: algorithm to a...

493

acquisition intrusion detection: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Next Page Last Page Topic Index 1 Security Intrusion & Detection Security Intrusion Computer Technologies and Information Sciences Websites Summary: intrusions, log suspicious...

494

ai techniques pra: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 1 AI Programming Techniques Lab 3: Second order programming Computer Technologies and Information Sciences Websites Summary: G52APT AI Programming...

495

adaptive intrusion detection: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 1 Adaptive Model Generation for Intrusion Detection Systems Computer Technologies and Information Sciences Websites Summary: Adaptive Model Generation for...

496

access control policies: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Last Page Topic Index 1 Resiliency Policies in Access Control , Mahesh Tripunitara Computer Technologies and Information Sciences Websites Summary: Resiliency Policies in Access...

497

ac losses: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

23 24 25 Next Page Last Page Topic Index 1 Transport AC loss in high temperature superconducting coils University of Cambridge - Dspace Summary: 's electromagnetic properties and...

498

affect gonadal fate: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

24 25 Next Page Last Page Topic Index 1 Predicting the fate of a living fossil: how will global warming affect sex determination Multidisciplinary Databases and Resources Websites...

499

australasian radiation protection: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

24 25 Next Page Last Page Topic Index 181 SUBCHAPTER F--RADIATION PROTECTION PROGRAMS PART 190--ENVIRONMENTAL RADI- Environmental Sciences and Ecology Websites Summary: STANDARDS...

500

alfalfa medicago sativa: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Last Page Topic Index 421 Characterization of the thermo-mechanical behaviour of Hemp fibres intended for the manufacturing of high performance composites. Physics Websites...