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Note: This page contains sample records for the topic "hard porous product" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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1

Production of porous coating on a prosthesis  

DOE Patents (OSTI)

Preselected surface areas of a prosthesis are covered by a blend of matching primary metallic particles and expendable particles. The particles are compressed and heated to assure that deformation and metallurgical bonding occurs between them and between the primary particles and the surface boundaries of the prosthesis. Porosity is achieved by removal of the expendable material. The result is a coating including discrete bonded particles separated by a network of interconnected voids presenting a homogeneous porous coating about the substrate. It has strength suitable for bone implant usage without intermediate adhesives, and adequate porosity to promote subsequent bone ingrowth.

Sump, Kenneth R. (Richland, WA)

1987-01-01T23:59:59.000Z

2

Soft Pion Emission in Hard Exclusive Pion Production  

E-Print Network (OSTI)

We investigate hard exclusive reactions on the nucleon with soft pion emission. A parametrization of corresponding hadronic matrix elements in terms of parton distributions for final pion-nucleon state is provided. These distributions are calculated in terms of nucleon and pion GPDs and the pion distribution amplitude via soft-pion theorems. Some observables for the process of hard charged pion production on the proton with soft pion emission are computed.

Maxim V. Polyakov; Simone Stratmann

2006-09-05T23:59:59.000Z

3

Method for producing flame retardant porous products and products produced thereby  

DOE Patents (OSTI)

A method for fire retarding porous products used for thermal energy storage and products produced thereby is provided. The method includes treating the surface of the phase change material-containing porous products with a urea fire-retarding agent. Upon exposure to a flame, the urea forms an adduct with the phase change material which will not sustain combustion (is self-extinguishing) in air. No halogens or metal oxides are contained in the fire retardant, so no potentially noxious halide smoke or fumes are emitted if the product is continuously exposed to a flame. 1 fig.

Salyer, I.O.

1998-08-04T23:59:59.000Z

4

Method for producing flame retardant porous products and products produced thereby  

DOE Patents (OSTI)

A method for fire retarding porous products used for thermal energy storage and products produced thereby is provided. The method includes treating the surface of the phase change material-containing porous products with a urea fire-retarding agent. Upon exposure to a flame, the urea forms an adduct with the phase change material which will not sustain combustion (is self-extinguishing) in air. No halogens or metal oxides are contained in the fire retardant, so no potentially noxious halide smoke or fumes are emitted if the product is continuously exposed to a flame.

Salyer, Ival O. (Dayton, OH)

1998-08-04T23:59:59.000Z

5

Method for Producing Flame Retardant Porous Products and Products Produced Thereby  

DOE Patents (OSTI)

A method for fire retarding porous products used for thermal energy storage and products produced thereby is provided. The method includes treating the surface of the phase change material-containing porous products with a urea fire-retarding agent. Upon exposure to a flame, the urea forms an adduct with the phase change material which will not sustain combustion (is self-extinguishing) in air. No halogens or metal oxides are contained in the fire retardant, so no potentially noxious halide smoke or fumes are emitted if the product is continuously exposed to a flame.

Salyer, Ival O. (Dayton, OH)

1998-08-04T23:59:59.000Z

6

Method for Developing Descriptions of Hard-to-Price Products: Results of the Telecommunications Product Study  

SciTech Connect

This report presents the results of a study to test a new method for developing descriptions of hard-to-price products. The Bureau of Labor Statistics (BLS) is responsible for collecting data to estimate price indices such as the Consumers Price Index (BLS) is responsible for collecting data to estimate price indices such as the Consumers Price Index (CPI). BLS accomplishes this task by sending field staff to places of business to price actual products. The field staff are given product checklists to help them determine whether products found today are comparable to products priced the previous month. Prices for non-comparable products are not included in the current month's price index calculations. A serious problem facing BLS is developing product checklists for dynamic product areas, new industries, and the service sector. It is difficult to keep checklists up-to-date and quite often simply to develop checklists for service industry products. Some people estimates that upwards of 50 % of US economic activity is not accounted for in the CPI

Conrad, F.; Tonn, B.

1999-05-01T23:59:59.000Z

7

Production of hard x rays in a plasma focus  

Science Journals Connector (OSTI)

A model of the plasma focus is considered in which large axial electric fields are induced by the imploding current sheet during the final few nanoseconds of the collapse phase. This field provides a mechanism for creation of a beam of electrons of highly suprathermal energies. For such a beam having a power?law energy spectrum the bremsstrahlung radiation above 100 keV to be expected from it both from electron?deuteron collisions in the focused plasma itself and when the beam reaches the walls of the device is calculated. The expected radiation from the walls is found to be several orders of magnitude higher than that from the plasma. Thus since experimental evidence indicates that little or no radiation above 100 keV originates in the walls the conclusion is drawn that the electrons in the beam must be decelerated after leaving the plasma and before reaching the walls. Upon comparison with experimental results qualitative agreement of the expected angular distribution of hard x rays with experiment is found. The total energy in accelerated electrons required to produce the observed total energy in hard x rays by this mechanism is also reasonable when compared with the total energy of the device.

C. E. Newman; Vahé Petrosian

1975-01-01T23:59:59.000Z

8

Process for casting hard-faced, lightweight camshafts and other cylindrical products  

DOE Patents (OSTI)

A process for casting a hard-faced cylindrical product such as an automobile camshaft includes the steps of: (a) preparing a composition formed from a molten base metal and an additive in particle form and having a hardness value greater than the hardness value of the base metal; (b) introducing the composition into a flask containing a meltable pattern of a cylindrical product such as an automobile camshaft to be manufactured and encased in sand to allow the composition to melt the pattern and assume the shape of the pattern within the sand; and (c) rotating the flask containing the pattern about the longitudinal axes of both the flask and the pattern as the molten base metal containing the additive in particle form is introduced into the flask to cause particles of the additive entrained in the molten base metal to migrate by centrifugal action to the radial extremities of the pattern and thereby provide a cylindrical product having a hardness value greater at it's radial extremities than at its center when the molten base metal solidifies.

Hansen, Jeffrey S. (Corvallis, OR); Turner, Paul C. (Albany, OR); Argetsinger, Edward R. (Albany, OR); Wilson, Rick D. (Corvallis, OR)

1996-01-01T23:59:59.000Z

9

Hydrogen production in ultrarich combustion of hydrocarbon fuels in porous media  

Science Journals Connector (OSTI)

Rich and ultrarich combustion of methane, ethane, and propane inside inert porous media is studied experimentally and numerically to examine the suitability of the concept for hydrogen production. Temperature, velocities, and chemical products of the combustion waves were recorded experimentally at a range of equivalence ratios from stoichiometry (? = 1.0) to ? = 2.5, for a filtration velocity of 12 cm/s. Two-temperature numerical model based on comprehensive heat transfer and chemical mechanisms is found to be in a good qualitative agreement with experimental data. Partial oxidation products of methane, ethane, and propane (H2, CO, and C2 hydrocarbons) are dominant for ultrarich superadiabatic combustion. The maximum hydrogen yield is close to 50% for all fuels, and carbon monoxide yield is close to 80%.

Mario Toledo; Valeri Bubnovich; Alexei Saveliev; Lawrence Kennedy

2009-01-01T23:59:59.000Z

10

Hard Quasi-real Photo-production of Charged Hadrons at COMPASS energies  

E-Print Network (OSTI)

The Common Muon Proton Apparatus for Structure and Spectroscopy (COMPASS) at CERN with its use of beams of naturally polarized muons scattered of a polarized deuteron target, provides an environment of hard scattering between quasi-real photons and partons. Hard hadron quasi-real photo-production with polarized initial states is sensitive to the polarized gluon distribution $\\Delta$G through $\\gamma$-gluon($g$) direct channels as well as $q$-$g$ resolved processes. Comparisons of unpolarized differential cross section measurements to next-to-leading order (NLO) pQCD calculations are essential to develop our understanding of proton-proton and lepton-nucleon scattering at varying center of mass energies. These measurements are important to asses the applicability of NLO pQCD in interpreting polarized processes. In this talk we will discuss unidentified charged separated hadron production at low $Q^{2}$ (Q$^{2}1.0\\,GeV/c$). $$ spectra of charged hadrons at $Q^{2}>1 GeV^{2}/c^{2}$ will also be discussed.

Astrid Morréale on behalf of the COMPASS collaboration

2010-12-13T23:59:59.000Z

11

Production of hard metal-like wear protection coatings by CO2 laser cladding  

Science Journals Connector (OSTI)

Protective coatings with hard metal-like wear properties could be obtained by laser beam surfacing of powder mixtures consisting of coarse-grained tungsten carbide and a nickel or cobalt hard alloy. The micros...

A. Techel; A. Luft; A. Müller; S. Nowotny

1995-12-01T23:59:59.000Z

12

Electroweak corrections to lepton pair production in association with two hard jets at the LHC  

E-Print Network (OSTI)

We compute the next-to-leading order corrections of $O(\\alpha_s^2\\alpha^3)$ to the hadronic production of two oppositely charged leptons and two hard jets, $p p \\to j j l^- l^+$, using Recola and Collier. We include electroweak and QCD corrections at the given order and all off-shell effects. We provide detailed predictions for the LHC operating at 13 TeV and obtain per-cent-level corrections for the total cross section. For differential distributions we find significant non-uniform distortions in high-energy tails at the level of several ten per cent due to electroweak Sudakov logarithms and deformations at the level of a few per cent for angular variables.

Ansgar Denner; Lars Hofer; Andreas Scharf; Sandro Uccirati

2014-11-04T23:59:59.000Z

13

Energy production rates in fluid mixtures of inelastic rough hard spheres  

E-Print Network (OSTI)

The aim of this work is to explore the combined effect of polydispersity and roughness on the partial energy production rates and on the total cooling rate of a granular fluid mixture. We consider a mixture of inelastic rough hard spheres of different number densities, masses, diameters, moments of inertia, and mutual coefficients of normal and tangential restitution. Starting from the first equation of the BBGKY hierarchy, the collisional energy production rates associated with the translational and rotational temperatures ($T_i^\\text{tr}$ and $T_i^\\text{rot}$) are expressed in terms of two-body average values. Next, those average values are estimated by assuming a velocity distribution function based on maximum-entropy arguments, allowing us to express the energy production rates and the total cooling rate in terms of the partial temperatures and the parameters of the mixture. Finally, the results are applied to the homogeneous cooling state of a binary mixture and the influence of inelasticity and roughness on the temperature ratios $T_1^\\text{tr}/T_1^\\text{rot}$, $T_2^\\text{tr}/T_1^\\text{tr}$, and $T_2^\\text{rot}/T_1^\\text{rot}$ is analyzed.

Andrés Santos; Gilberto M. Kremer; Vicente Garzó

2010-07-16T23:59:59.000Z

14

Introduction to Hard Cider Production Tuesday, January 13, 2015, 8:00 AM -3:30 PM (Snow Date January 14)  

E-Print Network (OSTI)

for Virginia Tech. He has collaborated on economic feasibility studies for small-scale cideries and hard cider fermentation, sanitation and stabilization. The program fee includes tasting of hard ciders of various flavors Snyder, Penn State Extension Educator 1:00 PM Hard Cider Production--Fermentation, Sanitation

Mohaghegh, Shahab

15

Syngas production from liquid fuels in a non-catalytic porous burner  

Science Journals Connector (OSTI)

This paper investigates rich combustion of n-heptane, diesel oil, kerosene and rapeseed-oil methyl ester (RME) bio-diesel for the purpose of producing syngas ready for the clean-up stages for fuel-cell applications or for traditional combustor enrichment. Rich flames have been stabilised in a two-layer inert porous medium combustor and a range of equivalence ratios and porous materials have been examined. n-heptane was successfully reformed up to an equivalence ratio of 3, reaching a conversion efficiency (based on the lower heating value of H2 and CO over the fuel input) up to 75% for a packed bed of alumina beads. Similarly, diesel, kerosene and bio-diesel were reformed to syngas in a Zirconia foam burner with conversion efficiency over 60%. A preliminary attempt to reduce the content of CO and hydrocarbons in the reformate has been also conducted using commercial steam reforming and water–gas shift reaction catalysts, obtaining encouraging results. Finally, soot emission has been assessed, demonstrating particle formation for diesel oil above ? = 2, whereas bio-diesel showed the lowest soot formation tendency among all the fuels tested.

A. Pastore; E. Mastorakos

2011-01-01T23:59:59.000Z

16

Analysis of deformation of porous metals  

SciTech Connect

The elasto-plastic finite element method using a yield criterion advanced by Lee and Kim was employed to analyze the effect of indenting geometry on the Brinell hardness of sintered porous copper specimens with various densities. The changes in geometry of porous iron rings with various initial relative densities were also calculated for various friction coefficients between the metal rings and compression platens. The calculated hardness values were in very good agreement with the measured data. The friction coefficient could be determined from the relationship between the change in the inner diameter and height reduction of porous metal rings with various initial relative densities.

Lee, D.N.; Oh, K.H. [Seoul National Univ. (Korea, Republic of). Div. of Materials Science and Engineering; Han, H.N. [Pohang Iron and Steel Co., Ltd., Kyungbuk (Korea, Republic of). Technical Research Labs.; Kim, H.S. [Chungnam National Univ., Taejeon (Korea, Republic of). Dept. of Metallurgical Engineering

1998-12-31T23:59:59.000Z

17

Long-term monitoring of fleshy fruit and hard mast production and seasonal bird distribution at the Savannah River Site, South Carolina.  

SciTech Connect

A final report of Fruit and hard mast production in five habitat types at SRS with a comparison of fruit consumption by fledgling versus adult birds at SRS and Relative importance of fruit, seeds, and insects in the diets of overwintering birds at SRS.

Greenberg, Cathryn, H.; Levey, Douglas J.

2009-06-15T23:59:59.000Z

18

Hardness Standardization Our objective is to standardize and improve hardness measurement  

E-Print Network (OSTI)

Hardness Standardization METALS Our objective is to standardize and improve hardness measurement and metallic products. · Of over 12 000 ASTM standards, hardness test method standards are among the most downloaded. · NIST produces a variety of hardness Standard Reference Materials (SRMs) for industry. Approach

19

Numerical analysis of hydrogen production via methane steam reforming in porous media solar thermochemical reactor using concentrated solar irradiation as heat source  

Science Journals Connector (OSTI)

Abstract The calorific value of syngas can be greatly upgraded during the methane steam reforming process by using concentrated solar energy as heat source. In this study, the Monte Carlo Ray Tracing (MCRT) and Finite Volume Method (FVM) coupling method is developed to investigate the hydrogen production performance via methane steam reforming in porous media solar thermochemical reactor which includes the mass, momentum, energy and irradiative transfer equations as well as chemical reaction kinetics. The local thermal non-equilibrium (LTNE) model is used to provide more temperature information. The modified P1 approximation is adopted for solving the irradiative heat transfer equation. The MCRT method is used to calculate the sunlight concentration and transmission problems. The fluid phase energy equation and transport equations are solved by Fluent software. The solid phase energy equation, irradiative transfer equation and chemical reaction kinetics are programmed by user defined functions (UDFs). The numerical results indicate that concentrated solar irradiation on the fluid entrance surface of solar chemical reactor is highly uneven, and temperature distribution has significant influence on hydrogen production.

Fuqiang Wang; Jianyu Tan; Yong Shuai; Liang Gong; Heping Tan

2014-01-01T23:59:59.000Z

20

Porous Power Technologies LLC | Open Energy Information  

Open Energy Info (EERE)

Porous Power Technologies LLC Porous Power Technologies LLC Jump to: navigation, search Logo: Porous Power Technologies LLC Name Porous Power Technologies LLC Address 2765 Dagny Way, Suite 200 Place Lafayette, Colorado Zip 80026 Sector Efficiency Product Laminable, porous, absorbent Li-ion batteries Website http://www.porouspower.com/ Coordinates 40.0130129°, -105.1327972° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":40.0130129,"lon":-105.1327972,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

Note: This page contains sample records for the topic "hard porous product" 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

Tailored Porous Materials  

SciTech Connect

Tailoring of porous materials involves not only chemical synthetic techniques for tailoring microscopic properties such as pore size, pore shape, pore connectivity, and pore surface reactivity, but also materials processing techniques for tailoring the meso- and the macroscopic properties of bulk materials in the form of fibers, thin films and monoliths. These issues are addressed in the context of five specific classes of porous materials: oxide molecular sieves, porous coordination solids, porous carbons, sol-gel derived oxides, and porous heteropolyanion salts. Reviews of these specific areas are preceded by a presentation of background material and review of current theoretical approaches to adsorption phenomena. A concluding section outlines current research needs and opportunities.

BARTON,THOMAS J.; BULL,LUCY M.; KLEMPERER,WALTER G.; LOY,DOUGLAS A.; MCENANEY,BRIAN; MISONO,MAKOTO; MONSON,PETER A.; PEZ,GUIDO; SCHERER,GEORGE W.; VARTULI,JAMES C.; YAGHI,OMAR M.

1999-11-09T23:59:59.000Z

22

The effects of gasification feedstock chemistries on the infiltration of slag into the porous high chromia refractory and their reaction products  

Science Journals Connector (OSTI)

Abstract Synthetic slags with compositions representative of carbonaceous feedstock derived from coal and petroleum coke were infiltrated into 90%Cr2O3–10%Al2O3 refractory material with a temperature gradient induced along the penetration direction of the slag. Experiments were conducted with a hot-face temperature of 1723 K (1450 °C) in a CO/CO2 gas mixture with a ratio of 1.8, which corresponded to an approximate oxygen partial pressure of 10?8 atm. Interactions between the slags and the refractory produced solid-solution spinel layers on the top interfaces of the refractory samples, whose chemistries reflected the compositions of major constituents of the starting slags. FeCr2O4 formed when samples were infiltrated with slag composition rich in FeO, which was typical for coals derived from eastern USA. (Mg,Fe)Cr2O4 formed when samples were infiltrated with slags, containing considerable concentrations of both MgO and FeO that were common in western US coals. In slags resulted from substituting 50% (by weight) of the coal feedstock by petcoke, similar solid solution phases formed as the pure coal counterparts, but with addition of V2O3, which originated from the petcoke feedstock. The chromium spinel layers, to a reasonable extent, limited infiltration by hindering the slag from flowing into the porous microstructure of the refractory and the formation mechanisms of the product layers were discussed. The Fe(Cr,V)2O4 layer that formed in the presence of petcoke ash exhibited an uneven morphology. As compared to the FeO rich slags, MgO rich slags penetrated further beyond the protective layers and into the refractory. Both of these phenomena could lead to increased refractory spallation rates in actual gasification conditions.

Tetsuya Kenneth Kaneko; Jingxi Zhu; Nathan Howell; Peter Rozelle; Seetharaman Sridhar

2014-01-01T23:59:59.000Z

23

Porous Power Technologies | Open Energy Information  

Open Energy Info (EERE)

Porous Power Technologies Porous Power Technologies Jump to: navigation, search Name Porous Power Technologies Place Lafayette, Colorado Zip 80026 Product Porous Power is a Colorado-based developer of microporous, laminatable battery separators. Coordinates 42.706102°, -88.48126° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.706102,"lon":-88.48126,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

24

Hard physics in PHENIX  

E-Print Network (OSTI)

We review recent results on hard observables in p+p, d+A and A+A collisions obtained by the PHENIX experiment. Emphasis is put on those measurements that provide insight into the properties of hot QCD media expected to be created in nucleus-nucleus collisions at RHIC energies. Direct photon spectra, jet properties and heavy quarks production measured in p+p and d+Au collisions are compared to the same observables extracted in heavy ion collisions to find modifications due to the presence of hot QCD matter.

D. Peressounko; for the PHENIX collaboration

2005-12-08T23:59:59.000Z

25

Novel hollow powder porous structures  

SciTech Connect

Recent finite element calculations indicate that structures constructed from partially compacted hollow spheres exhibit a greater stiffness and strength than many other cellular structures at comparable density. It has been observed that gas atomization of metallic powders often leads to entrapment of the flow field gas. The resulting hollow powders are an unwanted by-product in the sense that they lead to porosity and future sites of defect in solid parts. Here a method is developed to separate the hollow powders according to their size, shape and density. They are then consolidated to a porous structure. Examples of this are given for both a titanium alloy and a nickel-base superalloy. The compressive mechanical properties are measured and compared to those of other porous structures.

Sypeck, D.J.; Parrish, P.A.; Wadley, H.N.G. [Univ. of Virginia, Charlottesville, VA (United States). School of Engineering and Applied Science

1998-12-31T23:59:59.000Z

26

SPUTTERING FROM A POROUS MATERIAL BY PENETRATING IONS  

SciTech Connect

Porous materials are ubiquitous in the universe and weathering of porous surfaces plays an important role in the evolution of planetary and interstellar materials. Sputtering of porous solids in particular can influence atmosphere formation, surface reflectivity, and the production of the ambient gas around materials in space. Several previous studies and models have shown a large reduction in the sputtering of a porous solid compared to the sputtering of the non-porous solid. Using molecular dynamics simulations we study the sputtering of a nanoporous solid with 55% of the solid density. We calculate the electronic sputtering induced by a fast, penetrating ion, using a thermal spike representation of the deposited energy. We find that sputtering for this porous solid is, surprisingly, the same as that for a full-density solid, even though the sticking coefficient is high.

Rodriguez-Nieva, J. F. [Instituto Balseiro, Universidad Nacional de Cuyo, 8400 Bariloche (Argentina); Bringa, E. M. [CONICET and Instituto de Ciencias Basicas, Universidad Nacional de Cuyo, 5500 Mendoza (Argentina); Cassidy, T. A. [CalTech/JPL, Pasadena, CA 91109 (United States); Johnson, R. E.; Fama, M.; Baragiola, R. A. [Laboratory for Atomic and Surface Physics, University of Virginia, Charlottesville, VA 22903 (United States); Caro, A. [Los Alamos National Laboratory, Los Alamos, NM 94551 (United States); Loeffler, M. J. [NASA Goddard Space Flight Center, Astrochemistry Branch, Code 691, Greenbelt, MD 20771 (United States); Farkas, D. [Department of Materials Sciences, Virginia Tech, Blacksburg, VA 24061 (United States)

2011-12-10T23:59:59.000Z

27

Why engineer porous materials?  

Science Journals Connector (OSTI)

...Porous carbon of high thermal conductivity is used...absorption, fuel cells and battery materials is a number...photoluminescence, thermal conductivity, low k...self-lubricating bearings and battery electrodes. The range...vibration suppression and thermal management. The porous...

2006-01-01T23:59:59.000Z

28

Porous and cellular materials for structural applications  

SciTech Connect

The symposium, Porous and Cellular Materials for Structural Applications, was held on April 13--15 at the 1998 MRS Spring Meeting in San Francisco. Recent developments were presented and discussed in the area of porous and cellular materials, including polymer-, ceramic-, and metal-based materials. The general focus of the symposium was on porous materials that are being developed, at least in part, for structural applications. Theoretical aspects of the mechanical behavior of porous and cellular materials were discussed, as well as the specific mechanical properties of a wide variety of solid foam materials. Design principles for the use of solid foams in structures were presented, and a number of promising applications for porous and cellular materials were shown. Papers on the manufacture of solid foams and the production of parts containing solid foams were presented. A significant portion of the symposium was devoted to new porous materials that cannot be classified as foams, such as hollow spheres, hot isostatically compacted and expanded (HICE) materials and GASAR materials. Thirty nine papers were processed separately for inclusion on the data base.

Schwartz, D.S.; Shih, D.S. [eds.] [Boeing Co., St. Louis, MO (United States); Evans, A.G. [ed.] [Harvard Univ., Cambridge, MA (United States); Wadley, H.N.G. [ed.] [Univ. of Virginia, Charlottesville, VA (United States)

1998-12-31T23:59:59.000Z

29

Quantitative evaluation of effects of the soft interventions or cleaner production in households and the hard interventions: A Social Experiment Programme in a large river basin in Japan  

Science Journals Connector (OSTI)

Efforts have been made to reduce municipal wastewater pollutant discharge and improve river water quality in the Yamato-gawa River basin since 2005, as part of a Social Experiment Programme. The Programme was the first one in Japan to disseminate soft interventions in households, measurements to reduce pollutant discharge, in a large river basin with more than two million population. The soft interventions in households are similar to cleaner production in industrial sector because they are not the wastewater treatment and changing of lifestyles. This paper presents several methods for quantification of the pollutant discharge reduction. Two hypothetical soft intervention combinations were defined, the effects of 16 soft interventions were estimated using their proliferation rates, and estimated pollutant discharge reduction was compared with changes in river water quality during the Programme events. For the first method, environmental accounting housekeeping (EAH) books were applied to estimate a 38–53% reduction in biological oxygen demand (BOD), 26–40% reduction in total nitrogen (TN), and 21–32% reduction in total phosphorus (TP). These estimation results were comparable with the field survey results of approximately 100 person population, which were conducted in the late 1980s. Soft interventions were found to be several times more cost effective than hard interventions, such as development of municipal wastewater treatment and river water purification systems. The BOD discharge reduction effects of soft interventions initiated during Programme events increased from 0.3–2.3% in 2005–2007 to 2.4–4.7% in 2007–2009. The questionnaire surveys found that participants in the Programme events in average newly implemented three or four soft interventions in addition to those already implemented at normal times.

Yoshiaki Tsuzuki; Minoru Yoneda; Ryohei Tokunaga; Shinsuke Morisawa

2012-01-01T23:59:59.000Z

30

Foams in porous media  

SciTech Connect

In 1978 a literature search on selective blocking of fluid flow in porous media was done by Professor S.S. Marsden and two of his graduate students, Tom Elson and Kern Huppy. This was presented as SUPRI Report No. TR-3 entitled ''Literature Preview of the Selected Blockage of Fluids in Thermal Recovery Projects.'' Since then a lot of research on foam in porous media has been done on the SUPRI project and a great deal of new information has appeared in the literature. Therefore we believed that a new, up-to-date search should be done on foam alone, one which would be helpful to our students and perhaps of interest to others. This is a chronological survey showing the development of foam flow, blockage and use in porous media, starting with laboratory studies and eventually getting into field tests and demonstrations. It is arbitrarily divided into five-year time periods. 81 refs.

Marsden, S.S.

1986-07-01T23:59:59.000Z

31

Why engineer porous materials?  

Science Journals Connector (OSTI)

...thermal conductivity materials (Maex et al. 2003...Hrubesh et al. 1993); materials remarkably similar to...reduce the oxygen at the cathode and oxidize the fuel...electrochemically active, have large surface...volume fraction of porous materials about 0.3 (Brandon...

2006-01-01T23:59:59.000Z

32

Session: Hard Rock Penetration  

SciTech Connect

This session at the Geothermal Energy Program Review X: Geothermal Energy and the Utility Market consisted of five presentations: ''Hard Rock Penetration - Summary'' by George P. Tennyson, Jr.; ''Overview - Hard Rock Penetration'' by James C. Dunn; ''An Overview of Acoustic Telemetry'' by Douglas S. Drumheller; ''Lost Circulation Technology Development Status'' by David A. Glowka; ''Downhole Memory-Logging Tools'' by Peter Lysne.

Tennyson, George P. Jr.; Dunn, James C.; Drumheller, Douglas S.; Glowka, David A.; Lysne, Peter

1992-01-01T23:59:59.000Z

33

Memory Hard Drive Peripherals  

E-Print Network (OSTI)

1! CSI3131 Topics CPU Memory Hard Drive Peripherals Computing Systems OS Overview StructureDeadlocks M em ory M anagem ent Basic Memory Managermtn Virtual Memory Storage and I/O File Systems Hard Drive Management Swap I/O Management 2 Module 7: Memory Management Reading: Chapter 8 § To provide a detailed

Stojmenovic, Ivan

34

Innovation incentives and competition in the hard disk drive industry  

E-Print Network (OSTI)

Firms in the hard disk drive industry are continually engaging in R & D and improving the quality of their products. We explore various determinants of the product innovation incentives for firms concerned with both their ...

Wu, Xiaohua Sherry

2011-01-01T23:59:59.000Z

35

YFS2— The second-order Monte Carlo program for fermion pair production at LEP/SLC, with the initial state radiation of two hard and multiple soft photons  

Science Journals Connector (OSTI)

A Monte Carlo program simulating fermion pair production is presented. It features multiphoton bremsstrahlung out of the initial state beams. The contributions from soft photons are summed rigorously up to an infinite order using the Yennie-Frautschi-Suura method while the contributions from up to two hard photons are also properly treated. Four momenta of all soft and hard photons are explicitly generated and the total energy momentum conservation is exactly obeyed. The program is primarily aimed for LEP/SLC type experiments and will be helpful in the precise measurements of the Z0 mass and width, the basic parameters in precision tests of standard electroweak theory. It can also be used far away from the Z0 resonance as well. From the point of view of the QED, it provides the total cross section with precision 0.1% near the Z0 and 0.5% away from the Z0 resonance. With some restriction it can provide predictions for various asymmetries.

Stanislaw Jadach; B.F.L. Ward

1990-01-01T23:59:59.000Z

36

Additively manufactured 3D porous Ti-6Al-4V constructs mimic trabecular bone structure and regulate osteoblast proliferation, differentiation and local factor production in a porosity and surface roughness dependent manner  

Science Journals Connector (OSTI)

Additive manufacturing by laser sintering is able to produce high resolution metal constructs for orthopedic and dental implants. In this study, we used a human trabecular bone template to design and manufacture Ti-6Al-4V constructs with varying porosity via laser sintering. Characterization of constructs revealed interconnected porosities ranging from 15–70% with compressive moduli of 2579–3693 MPa. These constructs with macro porosity were further surface-treated to create a desirable multi-scale micro-/nano-roughness, which has been shown to enhance the osseointegration process. Osteoblasts (MG63 cells) exhibited high viability when grown on the constructs. Proliferation (DNA) and alkaline phosphatase specific activity, an early differentiation marker, decreased as porosity increased, while osteocalcin, a late differentiation marker, as well as osteoprotegerin, vascular endothelial growth factor and bone morphogenetic proteins 2 and 4 increased with increasing porosity. Three-dimensional (3D) constructs with the highest porosity and surface modification supported the greatest osteoblast differentiation and local factor production. These results indicate that additively manufactured 3D porous constructs mimicking human trabecular bone and produced with additional surface treatment can be customized for increased osteoblast response. Increased factors for osteoblast maturation and differentiation on high porosity constructs suggest the enhanced performance of these surfaces for increasing osseointegration in vivo.

Alice Cheng; Aiza Humayun; David J Cohen; Barbara D Boyan; Zvi Schwartz

2014-01-01T23:59:59.000Z

37

Plasma-assisted catalytic ionization using porous nickel plate  

SciTech Connect

Hydrogen atomic pair ions, i.e., H{sup +} and H{sup -} ions, are produced by plasma-assisted catalytic ionization using a porous nickel plate. Positive ions in a hydrogen plasma generated by dc arc discharge are irradiated to the porous plate, and pair ions are produced from the back of the irradiation plane. It becomes clear that the production quantity of pair ions mainly depends on the irradiation current of positive ions and the irradiation energy affects the production efficiency of H{sup -} ions.

Oohara, W.; Maeda, T.; Higuchi, T. [Department of Electronic Device Engineering, Yamaguchi University, Ube 755-8611 (Japan)

2011-09-15T23:59:59.000Z

38

Porous substrates filled with nanomaterials  

DOE Patents (OSTI)

A composition comprising: at least one porous carbon monolith, such as a carbon aerogel, comprising internal pores, and at least one nanomaterial, such as carbon nanotubes, disposed uniformly throughout the internal pores. The nanomaterial can be disposed in the middle of the monolith. In addition, a method for making a monolithic solid with both high surface area and good bulk electrical conductivity is provided. A porous substrate having a thickness of 100 microns or more and comprising macropores throughout its thickness is prepared. At least one catalyst is deposited inside the porous substrate. Subsequently, chemical vapor deposition is used to uniformly deposit a nanomaterial in the macropores throughout the thickness of the porous substrate. Applications include electrical energy storage, such as batteries and capacitors, and hydrogen storage.

Worsley, Marcus A.; Baumann, Theodore F.; Satcher, Jr., Joe H.; Stadermann, Michael

2014-08-19T23:59:59.000Z

39

Melting of hard cubes  

Science Journals Connector (OSTI)

The melting transition of a system of hard cubes is studied numerically both in the case of freely rotating cubes and when there is a fixed orientation of the particles: parallel cubes. It is shown that freely rotating cubes melt through a first-order transition, whereas parallel cubes have a continuous transition in which positional order is lost but bond-orientational order remains finite. This is interpreted in terms of a defect-mediated theory of melting.

E. A. Jagla

1998-10-01T23:59:59.000Z

40

Hard boiling eggs  

NLE Websites -- All DOE Office Websites (Extended Search)

Hard boiling eggs Hard boiling eggs Name: Sandburg J High Age: N/A Location: N/A Country: N/A Date: N/A Question: We have been studying chemical and physical changes in 6th grade science class and we were wondering whether hard boiling an egg would be a chemical or a physical change? Thanks for a reply! Replies: You decide. Here's what's going on: the proteins in the fresh egg are in the shape of tight little balls. When you boil the egg, these proteins unravel ("denature"), like balls of yarn unraveling into loose skeins. The strands of protein then get all tangled up with one another, so much so that they are locked in place and can no longer move. They also lock into place the other liquid components of the egg, forming all together what's called a "gel" instead of the liquid you started off with. The gel acts like a soft, rubbery solid because of the network of protein strands holding it all together. It's certainly true that when the protein denatures some chemical bonds are broken, but the most important effect is the tangling up process.

Note: This page contains sample records for the topic "hard porous product" 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

SUPER HARD SURFACED POLYMERS  

SciTech Connect

High energy ion beam surface treatments were applied to a selected group of polymers. Of the six materials in the present study, four were thermoplastics (polycarbonate, polyethylene, polyethylene terephthalate, and polystyrene) and two were thermosets (epoxy and polyimide). The particular epoxy evaluated in this work is one of the resins used in formulating fiber reinforced composites for military helicopter blades. Measures of mechanical properties of the near surface regions were obtained by nanoindentation hardness and pin on disk wear. Attempts were also made to measure erosion resistance by particle impact. All materials were hardness tested. Pristine materials were very soft, having values in the range of approximately 0.1 to 0.5 GPa. Ion beam treatment increased hardness by up to 50 times compared to untreated materials. For reference, all materials were hardened to values higher than those typical of stainless steels. Wear tests were carried out on three of the materials, PET, PI and epoxy. On the ion beam treated epoxy no wear could be detected, whereas the untreated material showed significant wear.

Mansur, Louis K [ORNL] [ORNL; Bhattacharya, R [UES, Incorporated, Dayton, OH] [UES, Incorporated, Dayton, OH; Blau, Peter Julian [ORNL] [ORNL; Clemons, Art [ORNL] [ORNL; Eberle, Cliff [ORNL] [ORNL; Evans, H B [UES, Incorporated, Dayton, OH] [UES, Incorporated, Dayton, OH; Janke, Christopher James [ORNL] [ORNL; Jolly, Brian C [ORNL] [ORNL; Lee, E H [Consultant, Milpitas, CA] [Consultant, Milpitas, CA; Leonard, Keith J [ORNL] [ORNL; Trejo, Rosa M [ORNL] [ORNL; Rivard, John D [ORNL] [ORNL

2010-01-01T23:59:59.000Z

42

Porous TiO2 microspheres with tunable properties for photocatalytic air purification Alberto Naldoni a,  

E-Print Network (OSTI)

, continuous operation, facile scale-up process from small to large production, and thorough control overPorous TiO2 microspheres with tunable properties for photocatalytic air purification Alberto

Suslick, Kenneth S.

43

Hard metal composition  

DOE Patents (OSTI)

A composition of matter having a Rockwell A hardness of at least 85 is formed from a precursor mixture comprising between 3 and 10 wt % boron carbide and the remainder a metal mixture comprising from 70 to 90% tungsten or molybdenum, with the remainder of the metal mixture comprising nickel and iron or a mixture thereof. The composition has a relatively low density of between 7 and 14 g/cc. The precursor is preferably hot pressed to yield a composition having greater than 100% of theoretical density.

Sheinberg, H.

1983-07-26T23:59:59.000Z

44

Hard metal composition  

DOE Patents (OSTI)

A composition of matter having a Rockwell A hardness of at least 85 is formed from a precursor mixture comprising between 3 and 10 weight percent boron carbide and the remainder a metal mixture comprising from 70 to 90 percent tungsten or molybdenum, with the remainder of the metal mixture comprising nickel and iron or a mixture thereof. The composition has a relatively low density of between 7 to 14 g/cc. The precursor is preferably hot pressed to yield a composition having greater than 100% of theoretical density.

Sheinberg, Haskell (Los Alamos, NM)

1986-01-01T23:59:59.000Z

45

Impedance tube measurements of printed porous materials  

Science Journals Connector (OSTI)

An impedance tube has been used to make measurements of the acoustic impedance of porous samples. Porous with designed porosities and tortuosities have been produced using 3D printing. Measured impedances are compared to calculated values.

Carl Frederickson

2014-01-01T23:59:59.000Z

46

Boron Nitride Porous Microbelts for Hydrogen Storage  

Science Journals Connector (OSTI)

Boron Nitride Porous Microbelts for Hydrogen Storage ... However, the attention paid to their potential applications in gas sorption, especially in case of hydrogen, has obviously been insufficient. ... boron nitride; porous; microbelts; specific surface area; hydrogen storage ...

Qunhong Weng; Xuebin Wang; Chunyi Zhi; Yoshio Bando; Dmitri Golberg

2013-01-09T23:59:59.000Z

47

Metal recovery from porous materials  

DOE Patents (OSTI)

The present invention relates to recovery of metals. More specifically, the present invention relates to the recovery of plutonium and other metals from porous materials using microwaves. The United States Government has rights in this invention pursuant to Contract No. DE-AC09-89SR18035 between the US Department of Energy and Westinghouse Savannah River Company.

Sturcken, E.F.

1991-01-01T23:59:59.000Z

48

Overview - Hard Rock Penetration  

SciTech Connect

The Hard Rock Penetration program is developing technology to reduce the costs of drilling and completing geothermal wells. Current projects include: lost circulation control, rock penetration mechanics, instrumentation, and industry/DOE cost shared projects of the Geothermal Drilling Organization. Last year, a number of accomplishments were achieved in each of these areas. A new flow meter being developed to accurately measure drilling fluid outflow was tested extensively during Long Valley drilling. Results show that this meter is rugged, reliable, and can provide useful measurements of small differences in fluid inflow and outflow rates. By providing early indications of fluid gain or loss, improved control of blow-out and lost circulation problems during geothermal drilling can be expected. In the area of downhole tools for lost circulation control, the concept of a downhole injector for injecting a two-component, fast-setting cementitious mud was developed. DOE filed a patent application for this concept during FY 91. The design criteria for a high-temperature potassium, uranium, thorium logging tool featuring a downhole data storage computer were established, and a request for proposals was submitted to tool development companies. The fundamental theory of acoustic telemetry in drill strings was significantly advanced through field experimentation and analysis. A new understanding of energy loss mechanisms was developed.

Dunn, James C.

1992-03-24T23:59:59.000Z

49

Overview: Hard Rock Penetration  

SciTech Connect

The Hard Rock Penetration program is developing technology to reduce the costs of drilling and completing geothermal wells. Current projects include: lost circulation control, rock penetration mechanics, instrumentation, and industry/DOE cost shared projects of the Geothermal Drilling organization. Last year, a number of accomplishments were achieved in each of these areas. A new flow meter being developed to accurately measure drilling fluid outflow was tested extensively during Long Valley drilling. Results show that this meter is rugged, reliable, and can provide useful measurements of small differences in fluid inflow and outflow rates. By providing early indications of fluid gain or loss, improved control of blow-out and lost circulation problems during geothermal drilling can be expected. In the area of downhole tools for lost circulation control, the concept of a downhole injector for injecting a two-component, fast-setting cementitious mud was developed. DOE filed a patent application for this concept during FY 91. The design criteria for a high-temperature potassium, uranium, thorium logging tool featuring a downhole data storage computer were established, and a request for proposals was submitted to tool development companies. The fundamental theory of acoustic telemetry in drill strings was significantly advanced through field experimentation and analysis. A new understanding of energy loss mechanisms was developed.

Dunn, J.C.

1992-08-01T23:59:59.000Z

50

Kevin Harding | Inventors | GE Global Research  

NLE Websites -- All DOE Office Websites (Extended Search)

Kevin Harding Kevin Harding Principal Engineer Manufacturing Technologies "Optics have grown enormously over the past 30 years and now touch our everyday lives, from internet...

51

Diffusion in Porous Catalysts and Adsorbents  

Science Journals Connector (OSTI)

Diffusion in Porous Catalysts and Adsorbents ... Single industrial adsorbent pellets of zeolites 5A and 13X were mounted with a polymer capable of withstanding high temperatures. ...

Jan Hoogschagen

1955-01-01T23:59:59.000Z

52

Effective permeabilities for model heterogeneous porous media  

SciTech Connect

This paper presents a technique to evaluate effective absolute permeabilities for heterogeneous porous media. The technique is based on a perturbation analysis of the equations of motion of a slightly compressible fluid in a homogeneous porous medium at low Reynolds numbers. The effective permeabilities can be calculated once the local geometry of the heterogeneous medium is specified. The technique is used to evaluate two- and three-dimensional effective vertical permeabilities in porous media with shale intercalations, including the case in which the porous matrix is anisotropic.

Otevo, C.; Rusinek, I. (Tecnologiade Yacimientos, INTEVEPS.A., P.O. Box 76343, Caracas 1070-A (VE)); Saez, A.E. (Departamento de Termodinamicay Fenomenosde Transferencia, Universidad Simon Bolivar, P.O. Box 89000, Caracas 1086-A (VE))

1990-01-01T23:59:59.000Z

53

Laboratory Measurement of Sorption in Porous Media  

E-Print Network (OSTI)

Laboratory Measurement of Sorption in Porous Media A REPORT SUBMITTED TO THE DEPARTMENT of pressure change used to determine equilibrium were made. The sorption isotherms measured for geothermal

Stanford University

54

Gas sensor incorporating a porous framework  

DOE Patents (OSTI)

The disclosure provides sensor for gas sensing including CO.sub.2 gas sensors comprising a porous framework sensing area for binding an analyte gas.

Yaghi, Omar M; Czaja, Alexander U; Wang, Bo; Galatsis, Kosmas; Wang, Kang L; Furukawa, Hiroyasu

2014-05-27T23:59:59.000Z

55

Study of Porous Adsorbents for Carbon Capture via Molecular Simulation  

E-Print Network (OSTI)

1.5 Porous adsorbents . . . . . . . 2 Evaluating mixtureStudy of Porous Adsorbents for Carbon Capture via MolecularFall 2012 Study of Porous Adsorbents for Carbon Capture via

Swisher, Joseph Andrew

2012-01-01T23:59:59.000Z

56

Two-phase flow in a chemically active porous medium  

E-Print Network (OSTI)

We study the problem of the transformation of a given reactant species into an immiscible product species, as they flow through a chemically active porous medium. We derive the equation governing the evolution of the volume fraction of the species -- in a one-dimensional macroscopic description --, identify the relevant dimensionless numbers, and provide simple models for capillary pressure and relative permeabilities, which are quantities of crucial importance when tackling multiphase flows in porous media. We set the domain of validity of our models and discuss the importance of viscous coupling terms in the extended Darcy's law. We investigate numerically the steady regime and demonstrate that the spatial transformation rate of the species along the reactor is non-monotonous, as testified by the existence of an inflection point in the volume fraction profiles. We obtain the scaling of the location of this inflection point with the dimensionless lengths of the problem. Eventually, we provide key elements for optimization of the reactor.

Alexandre Darmon; Michael Benzaquen; Thomas Salez; Olivier Dauchot

2014-11-20T23:59:59.000Z

57

Hierarchically Porous Graphene as a Lithium-Air Battery Electrode...  

NLE Websites -- All DOE Office Websites (Extended Search)

Hierarchically Porous Graphene as a Lithium-Air Battery Electrode. Hierarchically Porous Graphene as a Lithium-Air Battery Electrode. Abstract: Functionalized graphene sheets (FGS)...

58

Infrared Spectroscopy and Optical Constants of Porous Amorphous...  

NLE Websites -- All DOE Office Websites (Extended Search)

Spectroscopy and Optical Constants of Porous Amorphous Solid Water. Infrared Spectroscopy and Optical Constants of Porous Amorphous Solid Water. Abstract: Reflection-absorption...

59

Removal of Carbon Tetrachloride from a Layered Porous Medium...  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Tetrachloride from a Layered Porous Medium by Means of Soil Vapor Extraction Enhanced by Desiccation and Water Removal of Carbon Tetrachloride from a Layered Porous Medium...

60

Removal of carbon tetrachloride from a layered porous medium...  

NLE Websites -- All DOE Office Websites (Extended Search)

carbon tetrachloride from a layered porous medium by means of soil vapor extraction enhanced by desiccation and water Removal of carbon tetrachloride from a layered porous medium...

Note: This page contains sample records for the topic "hard porous product" 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

Production  

Science Journals Connector (OSTI)

Production is obtained from proved reserves but the determinants of the scale of production in the industry and country components of the world total are many and complex with some unique to the individual com...

D. C. Ion

1980-01-01T23:59:59.000Z

62

Explosion propagation in inert porous media  

Science Journals Connector (OSTI)

...the density, c the heat capacity and k the thermal...important in porous media combustion because it represents...voids and the rate of heat loss to the porous medium...velocities for a propagating combustion wave: the planar laminar...detonation velocity. For hydrocarbon fuel-air mixtures...

2012-01-01T23:59:59.000Z

63

Microelectromechanical pump utilizing porous silicon  

DOE Patents (OSTI)

A microelectromechanical (MEM) pump is disclosed which includes a porous silicon region sandwiched between an inlet chamber and an outlet chamber. The porous silicon region is formed in a silicon substrate and contains a number of pores extending between the inlet and outlet chambers, with each pore having a cross-section dimension about equal to or smaller than a mean free path of a gas being pumped. A thermal gradient is provided along the length of each pore by a heat source which can be an electrical resistance heater or an integrated circuit (IC). A channel can be formed through the silicon substrate so that inlet and outlet ports can be formed on the same side of the substrate, or so that multiple MEM pumps can be connected in series to form a multi-stage MEM pump. The MEM pump has applications for use in gas-phase MEM chemical analysis systems, and can also be used for passive cooling of ICs.

Lantz, Jeffrey W. (Albuquerque, NM); Stalford, Harold L. (Norman, OK)

2011-07-19T23:59:59.000Z

64

Production  

Energy.gov (U.S. Department of Energy (DOE))

Algae production R&D focuses on exploring resource use and availability, algal biomass development and improvements, characterizing algal biomass components, and the ecology and engineering of...

65

Materials science Nanotubes get hard  

E-Print Network (OSTI)

Materials science Nanotubes get hard under pressure Proc. Natl Acad. Sci. USA doi:10.1073/pnas.0405877101 (2004) When Zhongwu Wang et al. squeezed carbon nanotubes in a diamond anvil cell, they made nanotubes into diamond itself: the carbon material formed under compression at room temperature seems

Downs, Robert T.

66

Forced dewetting on porous media  

E-Print Network (OSTI)

We study the dewetting of a porous plate withdrawn from a bath of fluid. The microscopic contact angle is fixed to zero and the flow is assumed to be parallel to the plate (lubrication approximation). The ordinary differential equation involving the position of the water surface is analysed in phase space by means of numerical integration. We show the existence of a critical value of the capillary number $\\eta U / \\gamma$, above which no stationary contact line can exist. An analytical model, based on asymptotic matching is developed, that reproduces the dependence of the critical capillary number on the angle of the plate with respect to the horizontal for large control parameters (3/2 power law).

Olivier Devauchelle; Christophe Josserand; Stephane Zaleski

2005-09-13T23:59:59.000Z

67

Characterization of porous GASAR aluminum  

SciTech Connect

Experimental and numerical analyses were performed on porous aluminum samples to evaluate microstructure and mechanical properties. Experiments considered of tensile tests on dog-bone specimens containing 9 to 17% porosity, which were instrumented with axial and transverse extensometers. Properties measured included Young`s modulus, Poisson`s ratio remained constant with porosity., For the numerical simulations, 3-D, mesoscale, multilayer models were constructed to evaluate the effects of pore morphology and interactions on material properties. The models allowed systematic spatial positioning of the pore within the cell and the ability to form solid zones. Pore arrangement, the effect of constraint, and gradients on the stress state were investigated. By using different combinations of hex cells as building blocks, several complicated microstructural arrangements were simulated.

Bonenberger, R.J. [FM Technologies, Inc., Fairfax, VA (United States); Kee, A.J. [Geo-Centers, Inc., Fort Washington, MD (United States); Everett, R.K.; Matic, P. [Naval Research Lab., Washington, DC (United States)

1998-12-31T23:59:59.000Z

68

GASAR porous metals process control  

SciTech Connect

GASAR porous metals are produced by melting under a partial pressure of hydrogen and then casting into a mold that ensures directional solidification. Hydrogen is driven out of solution and usually grows as quasi-cylindrical pores normal to the solidification front. Experiments with pure nickel have been carried out under processing conditions of varying H{sub 2} partial pressure, total pressure (H{sub 2} + Ar), and superheat. An analysis that considers heterogeneous bubble nucleation was developed that identifies processing conditions in which hydrogen bubbles are stable in the liquid before solidification. It is hypothesized that these conditions lead to low porosity because these bubbles float out of the melt and escape the advancing solidification front. Experimental data are shown to support this hypothesis.

Apprill, J.M.; Poirier, D.R. [Univ. of Arizona, Tucson, AZ (United States); Maguire, M.C. [Sandia National Labs., Albuquerque, NM (United States); Gutsch, T.C. [California State Univ., Chico, CA (United States)

1998-12-31T23:59:59.000Z

69

Viscosity of isotropic hard particle fluids  

Science Journals Connector (OSTI)

A kinetic theory for the frequency?dependent shear viscosity ?(?) of isotropic fluids composed of non?spherical hard convex bodies is extended in two ways. First the theory is reformulated to allow ?(?) to be expressed directly in terms of matrix elements involving the shear stress tensor rather than in terms of the transverse momentum correlation function. Second relaxation of the antisymmetric component of the stress due to coupling with spin angular momentum is explicitly incorporated; this corrects an error in a previous version of the theory. The revised kinetic theory is compared with computer simulations for hard ellipsoids of revolution of axial ratio 2 3 5 and 10. Both the symmetric and antisymmetric contributions to ?(?) are well reproduced. Coupling with the collective molecular second?rank orientation tensor remains an important factor in determining the variation of ?(?) from high to low frequencies; the prediction of the magnitude of the associated dip in ?(?) is significantly improved. The new version of the theory is also more successful in predicting values of the zero?frequency shear viscosity ? the shear?orientation coupling parameter R and the Stokes–Einstein (–Debye) products D s? and D r?.

Michael P. Allen; Philip J. Camp; Carl P. Mason; Glenn T. Evans; Andrew J. Masters

1996-01-01T23:59:59.000Z

70

Production  

Energy.gov (U.S. Department of Energy (DOE))

Algae production R&D focuses on exploring resource use and availability, algal biomass development and improvements, characterizing algal biomass components, and the ecology and engineering of cultivation systems.

71

Method for forming gold-containing catalyst with porous structure  

DOE Patents (OSTI)

A method for forming a gold-containing catalyst with porous structure according to one embodiment of the present invention includes producing a starting alloy by melting together of gold and at least one less noble metal that is selected from the group consisting of silver, copper, rhodium, palladium, and platinum; and a dealloying step comprising at least partial removal of the less noble metal by dissolving the at least one less noble metal out of the starting alloy. Additional methods and products thereof are also presented.

Biener, Juergen; Hamza, Alex V; Baeumer, Marcus; Schulz, Christian; Jurgens, Birte; Biener, Monika M.

2014-07-22T23:59:59.000Z

72

Ultrasonic material hardness depth measurement  

DOE Patents (OSTI)

The invention is an ultrasonic surface hardness depth measurement apparatus and method permitting rapid determination of hardness depth of shafts, rods, tubes and other cylindrical parts. The apparatus of the invention has a part handler, sensor, ultrasonic electronics component, computer, computer instruction sets, and may include a display screen. The part handler has a vessel filled with a couplant, and a part rotator for rotating a cylindrical metal part with respect to the sensor. The part handler further has a surface follower upon which the sensor is mounted, thereby maintaining a constant distance between the sensor and the exterior surface of the cylindrical metal part. The sensor is mounted so that a front surface of the sensor is within the vessel with couplant between the front surface of the sensor and the part.

Good, Morris S. (Richland, WA); Schuster, George J. (Kennewick, WA); Skorpik, James R. (Kennewick, WA)

1997-01-01T23:59:59.000Z

73

Microwave assisted hard rock cutting  

DOE Patents (OSTI)

An apparatus for the sequential fracturing and cutting of subsurface volume of hard rock (102) in the strata (101) of a mining environment (100) by subjecting the volume of rock to a beam (25) of microwave energy to fracture the subsurface volume of rock by differential expansion; and , then bringing the cutting edge (52) of a piece of conventional mining machinery (50) into contact with the fractured rock (102).

Lindroth, David P. (Apple Valley, MN); Morrell, Roger J. (Bloomington, MN); Blair, James R. (Inver Grove Heights, MN)

1991-01-01T23:59:59.000Z

74

Manipulation of surface chemistry and nanostructure in porous silicon-based chemical sensors  

E-Print Network (OSTI)

advantages as a chemical sensing platform. The porous layera universal platform for sensing. Chemical Society Reviewschemical modification and porous layer structure make porous silicon a promising platform

Ruminski, Anne Marie

2009-01-01T23:59:59.000Z

75

Modelling and characterisation of porous materials.  

E-Print Network (OSTI)

??Porous materials possessing random microstructures exist in both organic (e.g. polymer foam, bone) and in-organic (e.g. silica aerogels) forms. Foams and aerogels are two such… (more)

Alsayednoor, Jafar

2013-01-01T23:59:59.000Z

76

Porous low dielectric constant materials for microelectronics  

Science Journals Connector (OSTI)

...porous low-k films. The most important ones at the present time are inorganic silica-based materials (silica xerogel, aerogels), silsesquioxanes (SSQ) and organic polymers. The advantage of silica- and SSQ-based materials is that their chemical...

2006-01-01T23:59:59.000Z

77

A MODEL FOR POROUS-MEDIUM COMBUSTION  

Science Journals Connector (OSTI)

......these applied in coal combustion appears in...understanding of the chemistry of combustion...GLASSMAN, Combustion (Academic Press...ESSENHIGH, In Chemistry of Coal Utilization...POROUS-MEDIUM COMBUSTION 177 8. D. A......

J. NORBURY; A. M. STUART

1989-02-01T23:59:59.000Z

78

Multiphase flow in fractured porous media  

SciTech Connect

The major goal of this research project was to improve the understanding of the gas-oil two-phase flow in fractured porous media. In addition, miscible displacement was studied to evaluate its promise for enhanced recovery.

Firoozabadi, A.

1995-02-01T23:59:59.000Z

79

Anomalous transport through porous and fractured media  

E-Print Network (OSTI)

Anomalous transport, understood as the nonlinear scaling with time of the mean square displacement of transported particles, is observed in many physical processes, including contaminant transport through porous and fractured ...

Kang, Peter Kyungchul

2014-01-01T23:59:59.000Z

80

A Marriage of Hardware and Hard Work  

NLE Websites -- All DOE Office Websites (Extended Search)

Shaken but Not Stirred Shaken but Not Stirred 2008 Rosalind Franklin Young Investigator Award The 2008 3-Way Meeting In R&D, Super X-rays Mark Many Spots A New Gas Loading System for Diamond Anvil Cells at GSECARS APS News Archives: 2012 | 2011 | 2010 | 2009 2008 | 2007 | 2006 | 2005 2004 | 2003 | 2002 | 2001 2000 Subscribe to APS News rss feed A Marriage of Hardware and Hard Work MAY 5, 2008 Bookmark and Share The first assembled production girder for the LCLS sits atop the coordinate measuring machine. From "SLAC Today," http://today.slac.stanford.edu/ The first undulator support girder assembly for the Linac Coherent Light Source (LCLS) at the Stanford Linear Accelerator Center (SLAC) made its way from the Collider Hall, where technicians are piecing them together, to the

Note: This page contains sample records for the topic "hard porous product" 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

Most Tensor Problems Are NP-Hard  

Science Journals Connector (OSTI)

We prove that multilinear (tensor) analogues of many efficiently computable problems in numerical linear algebra are NP-hard. Our list includes: determining the feasibility of a system of bilinear equations, deciding whether a 3-tensor possesses a given ... Keywords: #P-hardness, NP-hardness, Numerical multilinear algebra, VNP-hardness, bivariate matrix polynomials, hyperdeterminants, nonnegative definite tensors, polynomial time approximation schemes, symmetric tensors, system of multilinear equations, tensor eigenvalue, tensor rank, tensor singular value, tensor spectral norm, undecidability

Christopher J. Hillar; Lek-Heng Lim

2013-11-01T23:59:59.000Z

82

Method for preparing porous metal hydride compacts  

DOE Patents (OSTI)

A method for preparing porous metallic-matrix hydride compacts which can be repeatedly hydrided and dehydrided without disintegration. A mixture of a finely divided metal hydride and a finely divided matrix metal is contacted with a poison which prevents the metal hydride from dehydriding at room temperature and atmospheric pressure. The mixture of matrix metal and poisoned metal hydride is then compacted under pressure at room temperature to form porous metallic-matrix hydride compacts.

Ron, M.; Gruen, D.M.; Mendelsohn, M.H.; Sheft, I.

1980-01-21T23:59:59.000Z

83

Production of catalyst supports for coking and sorbents from brown coal  

Science Journals Connector (OSTI)

Thermal activation of brown coal for production of porous carbon materials in a set-up with fluidized oxidation catalyst has been studied.

M. L. Shchipko; V. B. Fenelonov; E. V. Shevtsov…

1994-11-01T23:59:59.000Z

84

Filtration Combustion in Hydrocarbon Desorption from a Porous Medium  

Science Journals Connector (OSTI)

We have investigated theoretically and experimentally the process of filtration combustion with hydrocarbon desorption from a porous skeleton realized, in particular, in heat cleaning of porous media out of resid...

S. I. Fut'ko; K. V. Dobrego; E. S. Shmelev…

2003-11-01T23:59:59.000Z

85

Porous materials for thermal management under extreme conditions  

Science Journals Connector (OSTI)

...engine; (ii) a Space Shuttle tile; and (iii) a Stirling engine heat exchanger. Highly porous, permeable materials...engine; (ii) a Space Shuttle tile; and (iii) a Stirling engine heat exchanger. Highly porous, permeable materials...

2006-01-01T23:59:59.000Z

86

Joining of porous silicon carbide bodies  

DOE Patents (OSTI)

A method of joining two porous bodies of silicon carbide is disclosed. It entails utilizing an aqueous slip of a similar silicon carbide as was used to form the porous bodies, including the sintering aids, and a binder to initially join the porous bodies together. Then the composite structure is subjected to cold isostatic pressing to form a joint having good handling strength. Then the composite structure is subjected to pressureless sintering to form the final strong bond. Optionally, after the sintering the structure is subjected to hot isostatic pressing to further improve the joint and densify the structure. The result is a composite structure in which the joint is almost indistinguishable from the silicon carbide pieces which it joins.

Bates, Carl H. (Worcester, MA); Couhig, John T. (Worcester, MA); Pelletier, Paul J. (Thompson, CT)

1990-05-01T23:59:59.000Z

87

Numerical study of porous media thermoelectric converter  

SciTech Connect

Thermoelectric conversion is direct conversion technology that has characteristics of being maintenance free. However, the efficiency of the conventional bulk semiconductor thermoelectric device is about 20% for ideal theoretical calculation, and less than 5% for an actual application. The efficiency is very low because the heat conduction in the device and the Joule loss are too large compared with the Peltier heat which is changed into the electric power. The thermoelectric device made by porous media is heated by the radiation and maintains a large temperature difference by the gas which passes in the porous device. Therefore, the influence of the heat conduction in the thermoelectric device is small and the improvement of the conversion efficiency can be attempted. In this paper, the authors report the calculated results and the performance of thermoelectric converter made with porous media.

Kosaka, Kenichirou; Yamada, Akira

1996-12-31T23:59:59.000Z

88

Field emission study of cobalt ion implanted porous silicon  

E-Print Network (OSTI)

Analysis . Field Emission Measurements of Cobalt Implanted Porous Silicon Differences between the 1mplanted Porous Silicon Field Emission Devioe and the Al-anode Oxidized Porous Silicon Field Emission Diode VII CONCLUSION 70 94 99 REFERENCES... Emission Diode (OPSFED) was developed and studied [8] . The OPSFED was using the irregularity on the interface between the oxidized porous silicon film and silicon substrate as field emission cathodes, and a thin aluminum layer deposited...

Liu, Hongbiao

2012-06-07T23:59:59.000Z

89

Method to prepare nanoparticles on porous mediums  

DOE Patents (OSTI)

A method to prepare porous medium decorated with nanoparticles involves contacting a suspension of nanoparticles in an ionic liquid with a porous medium such that the particles diffuse into the pores of the medium followed by heating the resulting composition to a temperature equal to or greater than the thermal decomposition temperature of the ionic liquid resulting in the removal of the liquid portion of the suspension. The nanoparticles can be a metal, an alloy, or a metal compound. The resulting compositions can be used as catalysts, sensors, or separators.

Vieth, Gabriel M. (Knoxville, TN) [Knoxville, TN; Dudney, Nancy J. (Oak Ridge, TN) [Oak Ridge, TN; Dai, Sheng (Knoxville, TN) [Knoxville, TN

2010-08-10T23:59:59.000Z

90

Porous polymeric materials for hydrogen storage  

DOE Patents (OSTI)

Porous polymers, tribenzohexazatriphenylene, poly-9,9'-spirobifluorene, poly-tetraphenyl methane and their derivatives for storage of H.sub.2 prepared through a chemical synthesis method. The porous polymers have high specific surface area and narrow pore size distribution. Hydrogen uptake measurements conducted for these polymers determined a higher hydrogen storage capacity at the ambient temperature over that of the benchmark materials. The method of preparing such polymers, includes oxidatively activating solids by CO.sub.2/steam oxidation and supercritical water treatment.

Yu, Luping (Hoffman Estates, IL); Liu, Di-Jia (Naperville, IL); Yuan, Shengwen (Chicago, IL); Yang, Junbing (Westmont, IL)

2011-12-13T23:59:59.000Z

91

Microfluidic devices and methods including porous polymer monoliths  

DOE Patents (OSTI)

Microfluidic devices and methods including porous polymer monoliths are described. Polymerization techniques may be used to generate porous polymer monoliths having pores defined by a liquid component of a fluid mixture. The fluid mixture may contain iniferters and the resulting porous polymer monolith may include surfaces terminated with iniferter species. Capture molecules may then be grafted to the monolith pores.

Hatch, Anson V; Sommer, Gregory J; Singh, Anup K; Wang, Ying-Chih; Abhyankar, Vinay V

2014-04-22T23:59:59.000Z

92

Modeling of molecular gas adsorption isotherms on porous materials with hybrid PC-SAFT–DFT  

Science Journals Connector (OSTI)

Abstract The developed hybrid PC-SAFT–DFT model, a coupling of density functional theory (DFT) with perturbed-chain statistical associating fluid theory (PC-SAFT), was used to study the adsorption of pure- and mixed-fluids on nano-porous materials, and carbons and zeolites were chosen as examples of nano-porous materials in this work for model performance evaluation. In the PC-SAFT–DFT model, the modified fundamental measure theory was used for the hard sphere contribution, the dispersion free energy functional was represented with a weighted density approximation, and the chain free energy functional from interfacial SAFT was used to account for the chain connectivity. The fluid was modeled as a chain molecule with molecular parameters taken from those in the bulk PC-SAFT. The external force field was used to describe the interaction between the solid surface of a nano-porous material and fluid. Application of this model was demonstrated on the gas adsorption on porous carbons and zeolites which were assumed to have slit- and cylinder-shaped pores with mean pore sizes, respectively. The parameters of the adsorption model were obtained by fitting to the pure-gas adsorption isotherms measured experimentally. With parameters of the model fitted to the pure-gas adsorption at one temperature, the model was used to predict the pure-gas adsorption at other temperatures as well as the adoption isotherms of mixtures. The model prediction was compared with the available experimental data, which shows that the predictions are reliable for most of the systems studied in this work. The effect of the pore size distribution on the model performance was further investigated, and it was found that the consideration of the pore size distribution (PSD) can improve the accuracy of the model results but the PSD analysis requires much more computing time.

Gulou Shen; Xiaohua Lu; Xiaoyan Ji

2014-01-01T23:59:59.000Z

93

Rich n-heptane and diesel combustion in porous media  

SciTech Connect

Rich n-heptane and diesel flames in two-layer porous media are experimentally investigated in the context of syngas production. The stable operating points of n-heptane reforming have been determined and the mole fractions of H{sub 2}, CO, CO{sub 2} and light hydrocarbons have been measured in the exhaust gas at an equivalence ratio of 2 for different thermal input values. The reformer performance has been assessed also from the point of view of the heat losses and the mixture homogeneity. The pre-vapouriser produces an approximately uniform vapour-air mixture upstream of the flame front. The range of flow rates for stable flames decreased with increasing equivalence ratio. Heat losses were about 10% of the thermal input at high firing rates. A 77.2% of the equilibrium H{sub 2} was achieved at a flame speed of 0.82 m/s. The same reactor with a different porous matrix for the reforming stage demonstrates diesel reforming to syngas with a conversion efficiency of 77.3% for a flame speed of 0.65 m/s. (author)

Pastore, A.; Mastorakos, E. [Department of Engineering, University of Cambridge, Cambridge CB2 1PZ (United Kingdom)

2010-04-15T23:59:59.000Z

94

By-Products Utilization  

E-Print Network (OSTI)

-specification ash generated from the combustion of high- sulfure coal. The coal combustion products used of the project indicate that high-carbon coal ash can be successfully used in porous base course applications is a Research Associate at the UWM-CBU. His research interests include the use of coal fly ash, coal bottom ash

Wisconsin-Milwaukee, University of

95

Coupling of porous filtration and ion-exchange membranes in an electrodialysis stack and impact on cation selectivity: A novel approach for sea water demineralization and the production of physiological water  

Science Journals Connector (OSTI)

Conventional electrodialysis (ED) and electrodialysis with ultrafiltration (EDUF) or nanofiltration (EDNF) membrane treatments were carried-out for partial desalination of sea water and to evaluate their potential for the production of physiological water. A demineralization rate of 10.6% was obtained with the EDNF and of 40.25% with EDUF and conventional ED processes. The nanofiltration membrane, due to its high electrical resistance, slowed down the migrations of ions. Moreover, the use of an ultrafiltration membrane had no significant effect on the demineralization rate of sea water and the electrodialytic parameters in comparison with the use of conventional ED membranes. A demineralization rate between 20.5 and 30.1% was obtained for each cation analyzed following EDNF treatments and between 43.3 and 64.4% when conventional ED or EDUF was used. Moreover, the decrease in the concentration of monovalent ions was slightly larger than for divalent ions in the case of ED and EDUF while for EDNF, the higher decrease was observed for calcium ion. This means that the replacement of a cation-exchange membrane by an ultrafiltration membrane would not change the selectivity of the process for ion separation but with a nanofiltration membrane a cation-selectivity appears.

Laurent Bazinet; Marianne Moalic

2011-01-01T23:59:59.000Z

96

Open-cell glass crystalline porous material  

DOE Patents (OSTI)

An open-cell glass crystalline porous material made from hollow microspheres which are cenospheres obtained from fly ash, having an open-cell porosity of up to 90 vol. % is produced. The cenospheres are separated into fractions based on one or more of grain size, density, magnetic or non-magnetic, and perforated or non-perforated. Selected fractions are molded and agglomerated by sintering with a binder at a temperature below the softening temperature, or without a binder at a temperature about, or above, the softening temperature but below the temperature of liquidity. The porous material produced has an apparent density of 0.3-0.6 g/cm.sup.3, a compressive strength in the range of 1.2-3.5 MPa, and two types of openings: through-flow wall pores in the cenospheres of 0.1-30 micrometers, and interglobular voids between the cenospheres of 20-100 micrometers. The porous material of the invention has properties useful as porous matrices for immobilization of liquid radioactive waste, heat-resistant traps and filters, supports for catalysts, adsorbents and ion-exchangers.

Anshits, Alexander G. (Krasnoyarsk, RU); Sharonova, Olga M. (Krasnoyarsk, RU); Vereshchagina, Tatiana A. (Krasnoyarsk, RU); Zykova, Irina D. (Krasnoyarsk, RU); Revenko, Yurii A. (Zheleznogorsk, RU); Tretyakov, Alexander A. (Zheleznogorsk, RU); Aloy, Albert S. (Saint-Petersburg, RU); Lubtsev, Rem I. (Saint-Petersburg, RU); Knecht, Dieter A. (Idaho Falls, ID); Tranter, Troy J. (Idaho Falls, ID); Macheret, Yevgeny (Idaho Falls, ID)

2002-01-01T23:59:59.000Z

97

Structure of Random Porous Materials: Silica Aerogel  

Science Journals Connector (OSTI)

Using small-angle x-ray scattering, we show that porous silica aerogel has a fractal backbone structure. The observed structure is traced to the underlying chemical (polymerization) and physical (colloid aggregation) growth processes. Comparison of scattering curves for aerogel with silica aggregates confirms this interpretation.

Dale W. Schaefer and Keith D. Keefer

1986-05-19T23:59:59.000Z

98

Automated measurement system employing eddy currents to adjust probe position and determine metal hardness  

DOE Patents (OSTI)

A system for measuring the hardness of cartridge cases employs an eddy current probe for inducing and sensing eddy currents in each cartridge case. A first component of the sensed signal is utilized in a closed loop system for accurately positioning the probe relative to the cartridge case both in the lift off direction and in the tangential direction, and a second component of the sensed signal is employed as a measure of the hardness. The positioning and measurement are carried out under closed loop microprocessor control facilitating hardness testing on a production line basis. 14 figs.

Prince, J.M.; Dodson, M.G.; Lechelt, W.M.

1989-07-18T23:59:59.000Z

99

Studies of Reaction Kinetics of Methane Hydrate Dissocation in Porous Media  

SciTech Connect

The objective of this study is the description of the kinetic dissociation of CH4-hydrates in porous media, and the determination of the corresponding kinetic parameters. Knowledge of the kinetic dissociation behavior of hydrates can play a critical role in the evaluation of gas production potential of gas hydrate accumulations in geologic media. We analyzed data from a sequence of tests of CH4-hydrate dissociation by means of thermal stimulation. These tests had been conducted on sand cores partially saturated with water, hydrate and CH4 gas, and contained in an x-ray-transparent aluminum pressure vessel. The pressure, volume of released gas, and temperature (at several locations within the cores) were measured. To avoid misinterpreting local changes as global processes, x-ray computed tomography scans provided accurate images of the location and movement of the reaction interface during the course of the experiments. Analysis of the data by means of inverse modeling (history matching ) provided estimates of the thermal properties and of the kinetic parameters of the hydration reaction in porous media. Comparison of the results from the hydrate-bearing porous media cores to those from pure CH4-hydrate samples provided a measure of the effect of the porous medium on the kinetic reaction. A tentative model of composite thermal conductivity of hydrate-bearing media was also developed.

Moridis, George J.; Seol, Yongkoo; Kneafsey, Timothy J.

2005-03-10T23:59:59.000Z

100

Measurement of LiCl removal behavior from porous solids by vacuum evaporation  

Science Journals Connector (OSTI)

Abstract Molten salt processes have been developed in various fields of engineering. In such a process, its efficiency and the quality of products would be enhanced when the used molten salt is effectively separated from the product and recycled into the process. Vacuum evaporation has been applied to recover molten salts due to the low vapor pressure and the high melting point. However, most of researches have been focused on the bulk salts evaporation. In this work, LiCl salt evaporation behavior from a porous solid was investigated to develop a post-treatment process of an electrolytic reduction process which uses LiCl as an electrolyte and produces porous solid products. The electrolytic reduction process is one of the main components of pyroprocessing to treat spent nuclear fuel and produce metallic uranium. Instead of using radioactive material, we prepared porous MgO chips and rods to determine the conditions and measure the behavior with different physical characteristics of the rods. The temperature and pressure were set to 700 oC and 20 mTorr, respectively, and more than 70% of salt was removed within 5 h.

Byung Heung Park; Seung-Chul Oh; Jin-Mok Hur

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

Experimental Study on the Basic Phenomena of Flame Stabilization Mechanism in a Porous Burner for Premixed Combustion Application  

Science Journals Connector (OSTI)

This was the driving force for investigation of porous burner application in exothermic thermal partial oxidation (POX) for production of syngas feed for MCFCs (Molten Carbonate Fuel Cells) and SOFCs (Solid Oxide Fuel Cells)(13) or for combustion of low calorific gases from landfills and waste pyrolysis. ... Although, due to the different maximal operational temperatures of the sponges it was not possible to perform all the investigations for the same set of conditions, a comparison between different burners can be made for the overlapping areas of the stable burning regions. ... Porous burners for lean-burn applications ...

Neda Djordjevic; Peter Habisreuther; Nikolaos Zarzalis

2012-10-18T23:59:59.000Z

102

Uncertainty quantification for porous media flows  

SciTech Connect

Uncertainty quantification is an increasingly important aspect of many areas of computational science, where the challenge is to make reliable predictions about the performance of complex physical systems in the absence of complete or reliable data. Predicting flows of oil and water through oil reservoirs is an example of a complex system where accuracy in prediction is needed primarily for financial reasons. Simulation of fluid flow in oil reservoirs is usually carried out using large commercially written finite difference simulators solving conservation equations describing the multi-phase flow through the porous reservoir rocks. This paper examines a Bayesian Framework for uncertainty quantification in porous media flows that uses a stochastic sampling algorithm to generate models that match observed data. Machine learning algorithms are used to speed up the identification of regions in parameter space where good matches to observed data can be found.

Christie, Mike [Institute of Petroleum Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, Scotland (United Kingdom)]. E-mail: mike.christie@pet.hw.ac.uk; Demyanov, Vasily [Institute of Petroleum Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, Scotland (United Kingdom); Erbas, Demet [Institute of Petroleum Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, Scotland (United Kingdom)

2006-09-01T23:59:59.000Z

103

Metallographic study of GASAR porous magnesium  

SciTech Connect

One of the promising techniques for making porous metals is the so-called GASAR process. In principle, the process affords considerable control over pore size, shape, and distribution. However, in practice, the pore microstructure is difficult to control, and a clearer understanding of microstructural evolution would be helpful. In this study, the authors undertake a detailed microstructural study of a porous Mg and AZ31 Mg alloy synthesized by the GASAR process. Microscopic studies demonstrated the presence of different pore size ranges. The pore distribution depended on the distance from the chill end of ingots. TEM observations revealed apparent crack lines (gas tracks) near the pores and ternary intermetallic phases in the alloy.

Park, C.; Nutt, S.R. [Univ. of Southern California, Los Angeles, CA (United States). Dept. of Materials Science

1998-12-31T23:59:59.000Z

104

Porous coordination copolymers and methods for their production  

DOE Patents (OSTI)

A coordination polymer includes a plurality of metal atoms or metal clusters linked together by a plurality of organic linking ligands. Each linking ligand comprises a residue of a negatively charged polydentate ligand. Characteristically, the plurality of multidentate ligands include a first linking ligand having first hydrocarbon backbone and a second ligand having a second hydrocarbon backbone. The first hydrocarbon backbone is different than the second hydrocarbon backbone.

Matzger, Adam J. (Ann Arbor, MI); Wong-Foy, Antek G. (Ann Arbor, MI); Koh, Kyoungmoo (Ann Arbor, MI)

2012-07-17T23:59:59.000Z

105

BPA Bisimilarity is EXPTIME-hard  

E-Print Network (OSTI)

Given a basic process algebra (BPA) and two stack symbols, the BPA bisimilarity problem asks whether the two stack symbols are bisimilar. We show that this problem is EXPTIME-hard.

Kiefer, Stefan

2012-01-01T23:59:59.000Z

106

Novel hard compositions and methods of preparation  

DOE Patents (OSTI)

Novel very hard compositions of matter are prepared by using in all embodiments only a minor amount of a particular carbide (or materials which can form the carbide in situ when subjected to heat and pressure); and no strategic cobalt is needed. Under a particular range of conditions, densified compositions of matter of the invention are prepared having hardnesses on the Rockwell A test substantially equal to the hardness of pure tungsten carbide and to two of the hardest commercial cobalt-bonded tungsten carbides. Alternately, other compositions of the invention which have slightly lower hardnesses than those described above in one embodiment also possess the advantage of requiring no tungsten and in another embodiment possess the advantage of having a good fracture toughness value.

Sheinberg, H.

1981-02-03T23:59:59.000Z

107

Hard x-ray imaging from explorer  

SciTech Connect

Coded aperture X-ray detectors were applied to obtain large increases in sensitivity as well as angular resolution. A hard X-ray coded aperture detector concept is described which enables very high sensitivity studies persistent hard X-ray sources and gamma ray bursts. Coded aperture imaging is employed so that approx. 2 min source locations can be derived within a 3 deg field of view. Gamma bursts were located initially to within approx. 2 deg and X-ray/hard X-ray spectra and timing, as well as precise locations, derived for possible burst afterglow emission. It is suggested that hard X-ray imaging should be conducted from an Explorer mission where long exposure times are possible.

Grindlay, J.E.; Murray, S.S.

1981-11-01T23:59:59.000Z

108

Living Bacterial Sacrificial Porogens to Engineer Decellularized Porous Scaffolds  

E-Print Network (OSTI)

Decellularization and cellularization of organs have emerged as disruptive methods in tissue engineering and regenerative medicine. Porous hydrogel scaffolds have widespread applications in tissue engineering, regenerative ...

Xu, Feng

109

Stable benzimidazole-incorporated porous polymer network for...  

NLE Websites -- All DOE Office Websites (Extended Search)

Stable benzimidazole-incorporated porous polymer network for carbon capture with high efficiency and low cost Previous Next List Muwei Zhang, Zachary Perry, Jinhee Park, Hong-Cai...

110

Polyamine-Tethered Porous Polymer Networks for Carbon Dioxide...  

NLE Websites -- All DOE Office Websites (Extended Search)

Polyamine-Tethered Porous Polymer Networks for Carbon Dioxide Capture from Flue Gas Previous Next List Weigang Lu, Julian P. Sculley, Daqiang Yuan, Rajamani Krishna, Zhangwen Wei,...

111

Evaluating different classes of porous materials for carbon capture...  

NLE Websites -- All DOE Office Websites (Extended Search)

Evaluating different classes of porous materials for carbon capture Previous Next List Johanna Maria Huck, Li-Chiang Lin, Adam Berger, Mahdi Niknam Shahrak, Richard Luis Martin,...

112

Building multiple adsorption sites in porous polymer networks...  

NLE Websites -- All DOE Office Websites (Extended Search)

Building multiple adsorption sites in porous polymer networks for carbon capture applications Previous Next List Weigang Lu, Wolfgang M. Verdegaal, Jiamei Yu, Perla B Balbuena,...

113

Synthesis, Structure, and Metalation of Two New Highly Porous...  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthesis, Structure, and Metalation of Two New Highly Porous Zirconium Metal-Organic Frameworks Previous Next List William Morris, Boris Volosskiy, Selcuk Demir, Felipe Gndara,...

114

Desiccation of unsaturated porous media: Intermediate-scale experiment...  

NLE Websites -- All DOE Office Websites (Extended Search)

with the multifluid flow simulator STOMP, using independently obtained hydraulic and thermal porous medium properties. In all the experiments, the injection of dry air proved...

115

SciTech Connect: Microfluidic devices and methods including porous...  

Office of Scientific and Technical Information (OSTI)

porous polymer monolith may include surfaces terminated with iniferter species. Capture molecules may then be grafted to the monolith pores. Authors: Hatch, Anson V; Sommer,...

116

Ammonia Capture in Porous Organic Polymers Densely Functionalized...  

NLE Websites -- All DOE Office Websites (Extended Search)

Ammonia Capture in Porous Organic Polymers Densely Functionalized with Brnsted Acid Groups Previous Next List Jeffrey F. Van Humbeck, Thomas M. McDonald, Xiaofei Jing, Brian M....

117

Thermodynamic Model for Fluid-Fluid Interfacial Areas in Porous...  

NLE Websites -- All DOE Office Websites (Extended Search)

areas are important in controlling the rate of mass and energy transfer between fluid phases in porous media. We present a modified thermodynamically based model (TBM) to...

118

Development of non-premixed porous inserted regenerative thermal oxidizer  

Science Journals Connector (OSTI)

In this study, a porous inserted regenerative thermal oxidizer (PRTO) system was developed for a... x emissions and high radiant efficiency. Zirconium dioxide (ZrO2...) ceramic ...

Jun-chun Zhang; Le-ming Cheng; Cheng-hang Zheng…

2013-09-01T23:59:59.000Z

119

Wear-resistance and hardness: Are they directly related for nanostructured hard materials?  

Science Journals Connector (OSTI)

Abstract The major challenge in the field of cemented carbides and other hard materials is to obtain their better combination of hardness, wear-resistance and fracture toughness. It is well known that the dependence of abrasion wear on fracture toughness for WC–Co cemented carbides is represented by a relatively narrow band and it is hardly possible to “break away” out from it by the use of conventional approaches based on varying the WC mean grain size and Co content. Also, it is well known that the wear-resistance of conventional cemented carbides depends mainly on their hardness. The major objective of this paper is to establish what will happen with the wear-resistance of hard materials as a result of their nanostructuring when the hardness is nearly the same as for conventional WC–Co cemented carbides. The results obtained provide clear evidence that, if one enters the region of nanostructured materials with the mean grain size of less than 10 nm, traditional wisdom indicating that the wear-resistance is directly related to the hardness appears not to be valid. In some cases of such nanostructured materials, it can be possible to achieve the dramatically improved wear-resistance compared to that of conventional WC–Co cemented carbides at nearly the same level of hardness and fracture toughness. The abovementioned is based on considering hard nanomaterials of the following four types: (1) WC–Co cemented carbides with nanograin reinforced binder, (2) near-nano WC–Co cemented carbides, (3) cemented carbides of the W–C–Cr–Si–Fe system for hard-facing having a nanostructured Fe-based binder, and (4) CVD hard materials consisting of nanostructured W2C grains embedded in a tungsten metal binder.

I. Konyashin; B. Ries; D. Hlawatschek; Y. Zhuk; A. Mazilkin; B. Straumal; F. Dorn; D. Park

2014-01-01T23:59:59.000Z

120

Novel hard compositions and methods of preparation  

DOE Patents (OSTI)

Novel very hard compositions of matter are prepared by using in all embodiments only a minor amount of a particular carbide (or materials which can form the carbide in situ when subjected to heat and pressure); and no strategic cobalt is needed. Under a particular range of conditions, densified compositions of matter of the invention are prepared having hardnesses on the Rockwell A test substantially equal to the hardness of pure tungsten carbide and to two of the hardest commercial cobalt-bonded tungsten carbides. Alternately, other compositions of the invention which have slightly lower hardnesses than those described above in one embodiment also possess the advantage of requiring no tungsten and in another embodiment possess the advantage of having a good fracture toughness value. Photomicrographs show that the shapes of the grains of the alloy mixture with which the minor amount of carbide (or carbide-formers) is mixed are radically altered from large, rounded to small, very angular by the addition of the carbide. Superiority of one of these hard compositions of matter over cobalt-bonded tungsten carbide for ultra-high pressure anvil applications was demonstrated. 3 figs.

Sheinberg, H.

1983-08-23T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

Novel hard compositions and methods of preparation  

DOE Patents (OSTI)

Novel very hard compositions of matter are prepared by using in all embodiments only a minor amount of a particular carbide (or materials which can form the carbide in situ when subjected to heat and pressure); and no strategic cobalt is needed. Under a particular range of conditions, densified compositions of matter of the invention are prepared having hardnesses on the Rockwell A test substantially equal to the hardness of pure tungsten carbide and to two of the hardest commercial cobalt-bonded tungsten carbides. Alternately, other compositions of the invention which have slightly lower hardnesses than those described above in one embodiment also possess the advantage of requiring no tungsten and in another embodiment possess the advantage of having a good fracture toughness value. Photomicrographs show that the shapes of the grains of the alloy mixture with which the minor amount of carbide (or carbide-formers) is mixed are radically altered from large, rounded to small, very angular by the addition of the carbide. Superiority of one of these hard compositions of matter over cobalt-bonded tungsten carbide for ultra-high pressure anvil applications was demonstrated.

Sheinberg, Haskell (Los Alamos, NM)

1983-08-23T23:59:59.000Z

122

Hydrogen Production from Methane Using Oxygen-permeable Ceramic Membranes  

E-Print Network (OSTI)

Non-porous ceramic membranes with mixed ionic and electronic conductivity have received significant interest as membrane reactor systems for the conversion of methane and higher hydrocarbons to higher value products like ...

Faraji, Sedigheh

2010-06-08T23:59:59.000Z

123

Characterizing unsaturated diffusion in porous tuff gravel  

SciTech Connect

Evaluation of solute diffusion in unsaturated porous gravel is very important for investigations of contaminant transport and remediation, risk assessment, and waste disposal (for example, the potential high-level nuclear waste repository at Yucca Mountain, Nevada). For a porous aggregate medium such as granular tuff, the total water content is comprised of surface water and interior water. The surface water component (water film around grains and pendular water between the grain contacts) could serve as a predominant diffusion pathway. To investigate the extent to which surface water films and contact points affect solute diffusion in unsaturated gravel, we examined the configuration of water using x-ray computed tomography in partially saturated gravel, and made quantitative measurements of diffusion at multiple water contents using two different techniques. In the first, diffusion coefficients of potassium chloride in 2-4 mm granular tuff at multiple water contents were calculated from electrical conductivity measurements using the Nernst-Einstein equation. In the second, we used laser ablation with inductively coupled plasma-mass spectrometry to perform micro-scale mapping, allowing the measurement of diffusion coefficients for a mixture of chemical tracers for tuff cubes and tetrahedrons having two contact geometries (cube-cube and cube-tetrahedron). The x-ray computed tomography images show limited contact between grains, and this could hinder the pathways for diffusive transport. Experimental results show the critical role of surface water in controlling transport pathways and hence the magnitude of diffusion. Even with a bulk volumetric water content of 1.5%, the measured solute diffusion coefficient is as low as 1.5 x 10{sup -14} m{sup 2}/s for tuff gravel. Currently used diffusion models relating diffusion coefficients to total volumetric water content inadequately describe unsaturated diffusion behavior in porous gravel at very low water contents.

Hu, Qinhong; Kneafsey, Timothy J.; Roberts, Jeffery J.; Tomutsa, Liviu; Wang, Joseph, S.Y.

2003-11-12T23:59:59.000Z

124

A rigid porous filter and filtration method  

SciTech Connect

The present invention involves a porous rigid filter comprising a plurality of concentric filtration elements having internal flow passages and forming external flow passages there between. The present invention also involves a pressure vessel containing the filter for the removal of particulate from high pressure particulate containing gases, and further involves a method for using the filter to remove such particulate. The present filter has the advantage of requiring fewer filter elements due to the high surface area- to-volume ratio provided by the filter, requires a reduced pressure vessel size, and exhibits enhanced mechanical design properties, improved cleaning properties, configuration options, modularity and ease of fabrication.

Chiang, Ta-Kuan; Straub, Douglas, Straub L.; Dennis, Richard A.

1998-12-01T23:59:59.000Z

125

Electrode With Porous Three-Dimensional Support  

SciTech Connect

Electrode including a paste containing particles of electrochemically active material and a conductive support consisting of a three-dimensional porous material comprising strands delimiting contiguous pores communicating via passages, characterized in that the average width L in .mu.m of said passages is related to the average diameter .O slashed. in .mu.m of said particles by the following equation, in which W and Y are dimensionless coefficients: wherein W=0.16 Y=1.69 X=202.4 .mu.m and Z=80 .mu.m

Bernard, Patrick (Massy, FR); Dauchier, Jean-Michel (Martignas, FR); Simonneau, Olivier (Dourdan, FR)

1999-07-27T23:59:59.000Z

126

Accepted Manuscript Title: Fuel Pyrolysis through Porous Media: Coke Formation  

E-Print Network (OSTI)

Accepted Manuscript Title: Fuel Pyrolysis through Porous Media: Coke Formation and Coupled effect. Gascoin, P. Gillard, M. Bouchez, J. Steelant, Fuel Pyrolysis through Porous Media: Coke Formation Coke Formation and Coupled effect on Permeability2 G. Fau1* , N. Gascoin1 , P. Gillard1 , M. Bouchez2

Paris-Sud XI, Université de

127

Mechanical Properties of Porous-Matrix Ceramic Composites**  

E-Print Network (OSTI)

requirements of high-temperature components for future gas turbine engine technologies becomes realizable). These mechanisms per- mit the development of multiple matrix cracks, which in turn produce inelastic strain during/Mechanical Properties of Porous-Matrix Ceramic Composites REVIEWS The porous matrix concept has been developed primarily

Zok, Frank

128

Microsoft Word - ORNL Hard Drives Final 08132010  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Inspections and Special Inquires Inspections and Special Inquires Inspection Report Internal Controls over Computer Hard Drives at the Oak Ridge National Laboratory INS-O-10-03 August 2010 Department of Energy Washington, DC 20585 August 16, 2010 MEMORANDUM FOR THE DIRECTOR, OFFICE OF SCIENCE FROM: Sandra D. Bruce Assistant Inspector General for Inspections and Special Inquiries SUBJECT: INFORMATION: Inspection Report on "Internal Controls over Computer Hard Drives at the Oak Ridge National Laboratory" BACKGROUND The Department of Energy's (Department) Oak Ridge National Laboratory (ORNL) in Oak

129

Microwave impregnation of porous materials with thermal energy storage materials  

DOE Patents (OSTI)

A method for impregnating a porous, non-metallic construction material with a solid phase-change material is described. The phase-change material in finely divided form is spread onto the surface of the porous material, after which the porous material is exposed to microwave energy for a time sufficient to melt the phase-change material. The melted material is spontaneously absorbed into the pores of the porous material. A sealing chemical may also be included with the phase-change material (or applied subsequent to the phase-change material) to seal the surface of the porous material. Fire retardant chemicals may also be included with the phase-change materials. The treated construction materials are better able to absorb thermal energy and exhibit increased heat storage capacity.

Benson, David K. (Golden, CO); Burrows, Richard W. (Conifer, CO)

1993-01-01T23:59:59.000Z

130

Hollow porous-wall glass microspheres for hydrogen storage  

DOE Patents (OSTI)

A porous wall hollow glass microsphere is provided having a diameter range of between 1 to 200 microns, a density of between 1.0 to 2.0 gm/cc, a porous-wall structure having wall openings defining an average pore size of between 10 to 1000 angstroms, and which contains therein a hydrogen storage material. The porous-wall structure facilitates the introduction of a hydrogen storage material into the interior of the porous wall hollow glass microsphere. In this manner, the resulting hollow glass microsphere can provide a membrane for the selective transport of hydrogen through the porous walls of the microsphere, the small pore size preventing gaseous or liquid contaminants from entering the interior of the hollow glass microsphere.

Heung, Leung K. (Aiken, SC); Schumacher, Ray F. (Aiken, SC); Wicks, George G. (Aiken, SC)

2010-02-23T23:59:59.000Z

131

Microwave impregnation of porous materials with thermal energy storage materials  

DOE Patents (OSTI)

A method for impregnating a porous, non-metallic construction material with a solid phase-change material is described. The phase-change material in finely divided form is spread onto the surface of the porous material, after which the porous material is exposed to microwave energy for a time sufficient to melt the phase-change material. The melted material is spontaneously absorbed into the pores of the porous material. A sealing chemical may also be included with the phase-change material (or applied subsequent to the phase-change material) to seal the surface of the porous material. Fire retardant chemicals may also be included with the phase-change materials. The treated construction materials are better able to absorb thermal energy and exhibit increased heat storage capacity.

Benson, D.K.; Burrows, R.W.

1993-04-13T23:59:59.000Z

132

Computed Shock Response of Porous Aluminum  

Science Journals Connector (OSTI)

The shock response of powdered aluminum compacted by a driver plate was simulated with a one?dimensional Lagrangiancontinuum mechanicscomputer program. The porous aluminum was mocked up by a series of flat plates separated by gaps to obtain an initial density of 1.35 g/cm3 for the ``powder.'' The compaction process was followed in detail for two cases of driver?plate conditions corresponding to two Stanford Research Institute experiments. The calculations showed an approach to equilibrium behind the shock in each of the porous samples. The equilibrium states established were found to be consistent with the Rankine?Hugoniot jump conditions applied to aluminum of density 1.35 g/cm3. These states did not lie on the Hugoniot curve of solid?density aluminum. This was shown to be due to the significant internal?energy dependency in the equation of state. The calculated results were in good agreement with the SRI experiments. Application of this computational model to more complex cases is indicated.

Ronald Hofmann; Dudley J. Andrews; D. E. Maxwell

1968-01-01T23:59:59.000Z

133

Multicomponent Gas Diffusion in Porous Electrodes  

E-Print Network (OSTI)

Multicomponent gas transport is investigated with unprecedented precision by AC impedance analysis of porous YSZ anode-supported solid oxide fuel cells. A fuel gas mixture of H2-H2O-N2 is fed to the anode, and impedance data are measured across the range of hydrogen partial pressure (10-100%) for open circuit conditions at three temperatures (800C, 850C and 900C) and for 300mA applied current at 800C. For the first time, analytical formulae for the diffusion resistance (Rb) of three standard models of multicomponent gas transport (Fick, Stefan-Maxwell, and Dusty Gas) are derived and tested against the impedance data. The tortuosity is the only fitting parameter since all the diffusion coefficients are known. Only the Dusty Gas model leads to a remarkable data collapse for over twenty experimental conditions, using a constant tortuosity consistent with permeability measurements and the Bruggeman relation. These results establish the accuracy of the Dusty Gas model for multicomponent gas diffusion in porous med...

Fu, Yeqing; Dutta, Abhijit; Mohanram, Aravind; Pietras, John D; Bazant, Martin Z

2014-01-01T23:59:59.000Z

134

Hard thermal loops in static external fields  

E-Print Network (OSTI)

We study, in the imaginary-time formalism, the high temperature behavior of n-point thermal loops in static Yang-Mills and gravitational fields. We show that in this regime, any hard thermal loop gives the same leading contribution as the one obtained by evaluating the loop at zero external energies and momenta.

J. Frenkel; S. H. Pereira; N. Takahashi

2009-02-04T23:59:59.000Z

135

Hard Drive Power Consumption Uncovered Computer Laboratory  

E-Print Network (OSTI)

Hard Drive Power Consumption Uncovered Computer Laboratory Digital Technology Group Anthony Hylick, Andrew Rice, Brian Jones, Ripduman Sohan Motivation Attempts to reduce power consumption have mainly of power consumption and identify the need for a more expressive API between the OS and hardware devices

Cambridge, University of

136

Peer Review Hit Hard By Shutdown  

Science Journals Connector (OSTI)

Peer Review Hit Hard By Shutdown ... The peer review system at many federal science funding agencies is gradually working its way out of chaos after the conclusion of a 16-day government shutdown. ... Hundreds of grant review panels were canceled at NSF and NIH alone. ...

ANDREA WIDENER

2013-10-28T23:59:59.000Z

137

Hard thermal loops in static external fields  

SciTech Connect

We examine, in the imaginary-time formalism, the high temperature behavior of n-point thermal loops in static Yang-Mills and gravitational fields. We show that in this regime, any hard thermal loop gives the same leading contribution as the one obtained by evaluating the loop integral at zero external energies and momenta.

Frenkel, J.; Takahashi, N. [Universidade de Sao Paulo, Instituto de Fisica Rua do Matao, Travessa R, 187-05508-090 Cidade Universitaria, Sao Paulo, SP (Brazil); Pereira, S. H. [Universidade de Sao Paulo, Instituto de Astronomia, Geofisica e Ciencias Atmosfericas Rua do Matao, 1226-05508-090 Cidade Universitaria, Sao Paulo, SP (Brazil)

2009-04-15T23:59:59.000Z

138

A Semi-Empirical Model for Porous Media Heat Exchanger Design Richard A. Wirtz1  

E-Print Network (OSTI)

and the effectiveness of the porous wall are always maximum when it is operated with the number of transfer units of the porous matrix greater than two (ntu 2). Furthermore, if the porous matrix is composed of a packed bed matrix is minimum when ntu 2. This suggest that for many design requirements, the porous media exchanger

Wirtz, Richard A.

139

Flow and heat transfer in porous micro heat sink for thermal management of high power LEDs  

Science Journals Connector (OSTI)

A novel porous micro heat sink system is presented for thermal management of high power LEDs, which has high heat transport capability. The operational principle and heat transfer characteristics of porous micro heat sink are analyzed. Numerical model ... Keywords: Heat dissipation, High heat flux, High power LEDs, Porous media, Porous micro heat sink

Z. M. Wan; J. Liu; K. L. Su; X. H. Hu; S. S. M

2011-05-01T23:59:59.000Z

140

UW -Center for Intelligent Materials and Systems Design of Energy Absorption Bases on Porous  

E-Print Network (OSTI)

NiTi Alloy Disk EDM Cutting (Electro-Discharge Machining) Porous NiTi Alloy Cylindrical Specimen HeatTi Alloy Porous Disc EDM Cutting (Electro-Discharge Machining) Porous NiTi Alloy Cylindrical Specimen Heat for Intelligent Materials and Systems EDM Cutting and Heat Treatment NiTi Porous Disc ( =30mm, h=4.5mm) = 5.0mm

Taya, Minoru

Note: This page contains sample records for the topic "hard porous product" 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.


141

Heavy Quark Production in ep Collisions  

E-Print Network (OSTI)

Heavy Quark Production in ep Collisions o Introduction o Charm Production o Beauty Production o in ep collisions 23 February 2007 2/17 Heavy Flavor Production Boson-Gluon Fusion, dominant process Hard of the proton: #12;G. Leibenguth, Heavy Quarks Production in ep collisions 23 February 2007 3/17 HERA, Electron

142

Apparatus and method for depositing coating onto porous substrate  

DOE Patents (OSTI)

Disclosed is an apparatus for forming a chemically vapor deposited coating on a porous substrate where oxygen from a first gaseous reactant containing a source of oxygen permeates through the pores of the substrate to react with a second gaseous reactant that is present on the other side of the substrate. The apparatus includes means for controlling the pressure and flow rate of each gaseous reactant, a manometer for measuring the difference in pressure between the gaseous reactants on each side of the substrate, and means for changing the difference in pressure between the gaseous reactants. Also disclosed is a method of detecting and closing cracks in the coating by reducing the pressure difference between the two gaseous reactants whenever the pressure difference falls suddenly after gradually rising, then again increasing the pressure difference on the two gases. The attack by the by-products of the reaction on the substrate are reduced by maintaining the flow rate of the first reactant through the pores of the substrate.

Isenberg, Arnold O. (Forest Hills Boro, PA); Zymboly, Gregory E. (Penn Hills Township, Allegheny County, PA)

1986-01-01T23:59:59.000Z

143

Rapid process for producing transparent, monolithic porous glass  

DOE Patents (OSTI)

A process for making transparent porous glass monoliths from gels. The glass is produced much faster and in much larger sizes than present technology for making porous glass. The process reduces the cost of making large porous glass monoliths because: 1) the process does not require solvent exchange nor additives to the gel to increase the drying rates, 2) only moderate temperatures and pressures are used so relatively inexpensive equipment is needed, an 3) net-shape glass monoliths are possible using this process. The process depends on the use of temperature to control the partial pressure of the gel solvent in a closed vessel, resulting in controlled shrinking during drying.

Coronado, Paul R. (Livermore, CA)

2006-02-14T23:59:59.000Z

144

Alzeta porous radiant burner. CRADA final report  

SciTech Connect

An Alzeta Pyrocore porous radiant burner was tested for the first time at elevated pressures and mass flows. Mapping of the burner`s stability limits (flashback, blowoff, and lean extinction limits) in an outward fired configuration and hot wall environment was carried out at pressures up to 18 atm, firing rates up to 180 kW, and excess air rates up to 100%. A central composite experimental design for parametric testing within the stability limits produced statistically sound correlations of dimensionless burner temperature and NO{sub x} emissions as functions of equivalence ratio, dimensionless firing rate, and reciprocal Reynolds number. The NO{sub x} emissions were below 4 ppmvd at 15% O{sub 2} for all conditions tested, and the CO and unburned hydrocarbon levels were simultaneously low. As a direct result of this cooperative research effort between METC and Alzeta, Solar Turbines has already expressed a strong interest in this novel technology.

NONE

1995-12-01T23:59:59.000Z

145

Strain rate effects in porous materials  

SciTech Connect

The behavior of metal foams under rapid loading conditions is assessed. Dynamic loading experiments were conducted in their laboratory using a split Hopkinson pressure bar apparatus and a drop weight tester; Strain rates ranged from 45 s{sup {minus}1} to 1200 s{sup {minus}1}. The implications of these experiments on open-cell, porous metals, and closed- and open-cell polymer foams are described. It is shown that there are two possible strain-rate dependent contributors to the impact resistance of cellular metals: (i) elastic-plastic resistance of the cellular metal skeleton, and (ii) the gas pressure generated by gas flow within distorted open cells. A theoretical basis for these implications is presented.

Lankford, J. Jr.; Dannemann, K.A. [Southwest Research Inst., San Antonio, TX (United States)

1998-12-31T23:59:59.000Z

146

Microsoft Word - HardingFarms-CX.docx  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

4, 2012 4, 2012 REPLY TO ATTN OF: KEC-4 SUBJECT: Environmental Clearance Memorandum Dawneen Dostert - TERR-LMT Proposed Action: Clark County Harding Farms LURR Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B4.9 Multiple use of powerline rights-of-way Location: Clark County, Washington - Township 3 North, Range 1 East, Section 25 and Vancouver Quadrangle Proposed by: Bonneville Power Administration (BPA) Description of the Proposed Action: In response to the Clark County Public Works (CCPW) Land Use Review Request (LURR), BPA proposes to grant Clark County two easements across BPA fee-owned parcel south of tower 4/5 of the Ross-Lexington 230-kV transmission line right-of-way. The proposal is necessary due to Clark County PUD's Harding Farms Storm Water and Wetland Improvements Project,

147

Gravitational infall in the hard wall model  

E-Print Network (OSTI)

An infalling shell in the hard wall model provides a simple holographic model for energy injection in a confining gauge theory. Depending on its parameters, a scalar shell either collapses into a large black brane, or scatters between the hard wall and the anti-de Sitter boundary. In the scattering regime, we find numerical solutions that keep oscillating for as long as we have followed their evolution, and we provide an analytic argument that shows that a black brane can never be formed. This provides examples of states in infinite-volume field theory that never thermalize. We find that the field theory expectation value of a scalar operator keeps oscillating, with an amplitude that undergoes modulation.

B. Craps; E. J. Lindgren; A. Taliotis; J. Vanhoof; H. Zhang

2014-12-15T23:59:59.000Z

148

Laser ablated hard coating for microtools  

DOE Patents (OSTI)

Wear-resistant coatings composed of laser ablated hard carbon films, are deposited by pulsed laser ablation using visible light, on instruments such as microscope tips and micro-surgical tools. Hard carbon, known as diamond-like carbon (DLC), films produced by pulsed laser ablation using visible light enhances the abrasion resistance, wear characteristics, and lifetimes of small tools or instruments, such as small, sharp silicon tips used in atomic probe microscopy without significantly affecting the sharpness or size of these devices. For example, a 10--20 nm layer of diamond-like carbon on a standard silicon atomic force microscope (AFM) tip, enables the useful operating life of the tip to be increased by at least twofold. Moreover, the low inherent friction coefficient of the DLC coating leads to higher resolution for AFM tips operating in the contact mode. 12 figs.

McLean, W. II; Balooch, M.; Siekhaus, W.J.

1998-05-05T23:59:59.000Z

149

Laser ablated hard coating for microtools  

DOE Patents (OSTI)

Wear-resistant coatings composed of laser ablated hard carbon films, are deposited by pulsed laser ablation using visible light, on instruments such as microscope tips and micro-surgical tools. Hard carbon, known as diamond-like carbon (DLC), films produced by pulsed laser ablation using visible light enhances the abrasion resistance, wear characteristics, and lifetimes of small tools or instruments, such as small, sharp silicon tips used in atomic probe microscopy without significantly affecting the sharpness or size of these devices. For example, a 10-20 nm layer of diamond-like carbon on a standard silicon atomic force microscope (AFM) tip, enables the useful operating life of the tip to be increased by at least twofold. Moreover, the low inherent friction coefficient of the DLC coating leads to higher resolution for AFM tips operating in the contact mode.

McLean, II, William (Oakland, CA); Balooch, Mehdi (Berkeley, CA); Siekhaus, Wigbert J. (Berkeley, CA)

1998-05-05T23:59:59.000Z

150

Fixed target electroweak and hard scattering physics  

SciTech Connect

The possibilities for future physics and experiments involving weak and electromagnetic interactions, neutrino oscillations, general hard scattering and experiments involving nuclear targets were explored. The studies were limited to the physics accessible using fixed target experimentation. While some of the avenues explored turn out to be relatively unrewarding in the light of competition elsewhere in the world, there are a number of positive conclusions reached about experimentation in the energy range available to the Main Injector and Tevatron. Some of the experiments would benefit from the increased intensity available from the Tevatron utilizing the Main Injector, while some require this increase. Finally, some of the experiments would use the Main Injector low energy, high intensity extracted beams directly. A program of electroweak and hard scattering experiments at fixed target energies retains the potential for important contributions to physics. The key to major parts of this program would appear to be the existence of the Main Injector. 115 refs, 17 figs.

Brock, R. (Michigan State Univ., East Lansing, MI (USA)); Brown, C.N.; Montgomery, H.E. (Fermi National Accelerator Lab., Batavia, IL (USA)); Corcoran, M.D. (eds.) (Rice Univ., Houston, TX (USA))

1990-02-01T23:59:59.000Z

151

Hard and soft probe - medium interactions in a 3D hydro+micro approach at RHIC  

E-Print Network (OSTI)

We utilize a 3D hybrid hydro+micro model for a comprehensive and consistent description of soft and hard particle production in ultra-relativistic heavy-ion collisions at RHIC. In the soft sector we focus on the dynamics of (multi-)strange baryons, where a clear strangeness dependence of their collision rates and freeze-out is observed. In the hard sector we study the radiative energy loss of hard partons in a soft medium in the multiple soft scattering approximation. While the nuclear suppression factor $R_{AA}$ does not reflect the high quality of the medium description (except in a reduced systematic uncertainty in extracting the quenching power of the medium), the hydrodynamical model also allows to study different centralities and in particular the angular variation of $R_{AA}$ with respect to the reaction plane, allowing for a controlled variation of the in-medium path-length.

Bass, S A; Ruppert, J; Nonaka, C

2007-01-01T23:59:59.000Z

152

Fluid Mixtures of Parallel Hard Cubes  

Science Journals Connector (OSTI)

The direct correlation function of a fluid mixture of parallel hard cubes is obtained by using Rosenfeld's fundamental measure approximation. This approximation is thermodynamically consistent (compressibility and virial equations of state are equal) and predicts a spinodal instability of the binary mixture for large-to-small side ratio larger than roughly 10, in qualitative agreement with simulations on the lattice version of the model. In two dimensions the system never demixes, also in agreement with the simulations.

José A. Cuesta

1996-05-13T23:59:59.000Z

153

Sharper Focusing of Hard X-rays  

NLE Websites -- All DOE Office Websites (Extended Search)

Sharper Focusing of Hard X-rays FROM: Physics News Update Number 773 #1, April 12, 2006, by Phil Schewe and Ben Stein Note: This text has been slightly modified from the original. Sharper focusing of hard x-rays has been achieved with a device developed at Argonne National Lab. Because of their high energy, x-rays are hard to focus: they can be reflected from a surface but only at a glancing angle (less than a tenth of a degree); they can be refracted but the index of refraction is very close to 1, so that making efficient lenses becomes a problem; and they can be diffracted, but the relatively thick, variable pitch grating required for focusing is tricky to achieve. The Argonne device is of the diffraction type, and it consists of a stack of alternating layers of metal and silicon, made by depositing progressively thicker layers. When the x-rays fall on such a structure, nearly edge-on, what they see is a grating (called a linear zone plate) consisting of a sort of bar-code pattern.

154

Erosion of hard material coating systems  

Science Journals Connector (OSTI)

The use of coating systems to protect structural metal surfaces from elevated temperature, small solid particle erosion and erosion-corrosion can extend component life and permit operation in more severe environments. The room and elevated temperature erosion behavior of several hard material coating systems, i.e. carbides, borides and nitrides, were determined over a range of test conditions. Particle velocities from 70 to 150 m s?1 and test temperatures from 25 to 540°C were used. Mechanisms of erosion were established and related to erosion rates in a manner that defined the requirements of composition, morphology and defect levels of coating systems for long-term performance. It was determined that small grain size, low porosity and absence of cracks were the microstructural features that enhanced erosion resistance. Hardness levels and the composition and distribution of second phase, hard particles had less effect on coating performance. Angular SiC particles were considerably more erosive than either Al2O3 or chromite-mixed oxide round-shaped particles and the rankings of the coatings' performance were different for each erodent and set of test conditions.

Alan V. Levy; Wang Buqian

1988-01-01T23:59:59.000Z

155

Nickel catalysts based on porous nickel for methane steam reforming  

Science Journals Connector (OSTI)

The influence of synthesis conditions on the phase composition and texture of porous nickel supports as plates with a magnesium oxide underlayer were investigated by X-ray diffraction, low-temperature nitrogen...

Z. A. Sabirova; M. M. Danilova; V. I. Zaikovskii; N. A. Kuzin…

2008-05-01T23:59:59.000Z

156

Cryogenic Fluid Flow Heat Transfer in a Porous Heat Exchanger  

Science Journals Connector (OSTI)

The recent utilization of porous heat exchangers in various key industries has aroused considerable interest in the heat transfer and fluid dynamics processes in channel flows involving suction...1], suction with...

L. L. Vasiliev; G. I. Bobrova; S. K. Vinokurov…

1978-01-01T23:59:59.000Z

157

Experimental design for study of nucleate boiling in porous structures  

E-Print Network (OSTI)

The superheat required to initiate nucleate boiling inside porous wicks is not well understood in practice. This thesis reports the design of an experimental setup for investigating the onset of vapor nucleation in sintered ...

Kelley, Mitchell Joseph

2011-01-01T23:59:59.000Z

158

Study on electroluminescence from porous silicon light-emitting diode  

Science Journals Connector (OSTI)

Porous silicon (PS) light-emitting diode (LED) with an ITO/PS/p-Si/Al structure was fabricated by anodic oxidation method. Photoluminescence (PL) of the PS LED was measured with a...

Yang, Yajun; Li, Qingshan; Liu, Xianyun

2006-01-01T23:59:59.000Z

159

Gasification and combustion modeling for porous char particles  

E-Print Network (OSTI)

Gasification and combustion of porous char particles occurs in many industrial applications. Reactor-scale outputs of importance depend critically on processes that occur at the particle-scale. Because char particles often ...

Singer, Simcha Lev

2012-01-01T23:59:59.000Z

160

Heterojunction solar cells produced by porous silicon layer transfer technology  

Science Journals Connector (OSTI)

In this paper, we present the result of heterojunction solar cells based on porous silicon layer transfer technology. a-Si/c-Si structured solar cells were prepared in which the c-Si ... was investigated. The spe...

Zhihao Yue; Honglie Shen; Lei Zhang; Bin Liu; Chao Gao; Hongjie Lv

2012-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

Porous material and process development for electrospray propulsion applications  

E-Print Network (OSTI)

Ion electrospray propulsion devices rely on the transportation of ionic liquid propellant to emission regions where ions are extracted at high velocities. One such method involves the use of porous substrates to passively ...

Arestie, Steven Mark

2014-01-01T23:59:59.000Z

162

The evolution of miscible gravity currents in horizontal porous layers  

E-Print Network (OSTI)

Gravity currents of miscible fluids in porous media are important to understand because they occur in important engineering projects, such as enhanced oil recovery and geologic CO[subscript 2] sequestration. These flows ...

Szulczewski, Michael Lawrence

163

Nonlinear dynamics of capacitive charging and desalination by porous electrodes  

E-Print Network (OSTI)

The rapid and efficient exchange of ions between porous electrodes and aqueous solutions is important in many applications, such as electrical energy storage by supercapacitors, water desalination and purification by ...

Bazant, Martin Z.

164

Pinning in a porous high-temperature superconductor Bi2223  

Science Journals Connector (OSTI)

The current-voltage characteristics of a porous superconductor Bi2Sr2Ca2Cu3O x (Bi2223) have been measured at temperatures in the range from 10 to 90 ... been found that the ele...

K. Yu. Terent’ev; D. M. Gokhfel’d; S. I. Popkov…

2011-12-01T23:59:59.000Z

165

Convective stability of carbon sequestration in anisotropic porous media  

Science Journals Connector (OSTI)

...Convective stability of carbon sequestration in anisotropic porous media...media|stability theory|carbon sequestration| 1. Introduction The world's...processes occurring during carbon dioxide sequestration in underground saline aquifers...

2014-01-01T23:59:59.000Z

166

Tripyrrylmethane based 2D porous structure for hydrogen storage  

Science Journals Connector (OSTI)

The key to hydrogen storage is to design new materials with light ... explored Ti-tripyrrylmethane based 2D porous structure for hydrogen storage using density functional theory. We have found ... and the exposed...

Xiao Zhou ??; Jian Zhou ??; Qiang Sun ??

2011-06-01T23:59:59.000Z

167

High-Throughput Characterization of Porous Materials Using Graphics...  

NLE Websites -- All DOE Office Websites (Extended Search)

High-Throughput Characterization of Porous Materials Using Graphics Processing Units Previous Next List J. Kim, R. L. Martin, O. Rubel, M. Haranczyk, and B. Smit, J. Chem. Theory...

168

Vortex development behind a finite porous obstruction in a channel  

E-Print Network (OSTI)

This experimental study describes the turbulent wake behind a two-dimensional porous obstruction, consisting of a circular array of cylinders. The cylinders extend from the channel bed through the water surface, mimicking ...

Zong, Lijun

169

Porous solid ion exchange wafer for immobilizing biomolecules  

DOE Patents (OSTI)

A porous solid ion exchange wafer having a combination of a biomolecule capture-resin and an ion-exchange resin forming a charged capture resin within said wafer. Also disclosed is a porous solid ion exchange wafer having a combination of a biomolecule capture-resin and an ion-exchange resin forming a charged capture resin within said wafer containing a biomolecule with a tag. A separate bioreactor is also disclosed incorporating the wafer described above.

Arora, Michelle B. (Woodridge, IL); Hestekin, Jamie A. (Morton Grove, IL); Lin, YuPo J. (Naperville, IL); St. Martin, Edward J. (Libertyville, IL); Snyder, Seth W. (Lincolnwood, IL)

2007-12-11T23:59:59.000Z

170

Investigation of porous media structures using NMR restricted diffusion measurements  

E-Print Network (OSTI)

INVESTIGATION OF POROUS MEDIA STRUCTURES USING NMR RESTRICTED DIFFUSION MEASUREMENTS A Thesis by PEIZHI MIAO Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 1993 Major Subject: Chemical Engineering INVESTIGATION OF POROUS MEDIA STRUCTURES USING NMR RESTRICTED DIFFUSION MEASUREMENTS A Thesis by PEIZHI MIAO Approved ss to style and content by: A. T. Watson (Chair of Committee) C...

Miao, Peizhi

2012-06-07T23:59:59.000Z

171

Two dimensional properties of methane adsorbed on porous silicon  

E-Print Network (OSTI)

TWO DIMENSIONAL PROPERTIES OF METHANE ADSORBED ON POROUS SILICON A Thesis by RICHARD FRANKLIN TENNIS Submitted to the Office of Graduate Studies of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE May 1989 Major Subject: Physics TWO DIMENSIONAL PROPERTIES OF METHANE ADSORBED ON POROUS SILICON A Thesis by RICHARD FRANKLIN TENNIS Approved as to style and content by: P. Kirk (C ir of Committee) Glenn olet (M er) Da J. Ernst...

Tennis, Richard Franklin

2012-06-07T23:59:59.000Z

172

Nuclear magnetic resonance study of methane adsorbed on porous silicon  

E-Print Network (OSTI)

NUCLEAR MAGNETIC RESONANCE STUDY OF METHANE ADSORBED ON POROUS SILICON A Thesis by FENG I I Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... May 1992 Major Subject: Physics NUCLEAR MAGNETIC RESONANCE STUDY OF METHANE ADSORBED ON POROUS SILICON A Thesis by FENG LI Approved as to style and content by: . P. Kirk (Chair of Committee) i G. Agnolet (Member) J. H. Ross, r (Member) M...

Li, Feng

2012-06-07T23:59:59.000Z

173

Design of Hard Water Stable Emulsifier Systems for Petroleum-  

E-Print Network (OSTI)

Design of Hard Water Stable Emulsifier Systems for Petroleum- and Bio-based Semi for petroleum and bio-based MWFs that improve fluid lifetime by providing emulsion stability under hard water. The newly developed petroleum and bio-based formulations with improved hard water stability are competitive

Clarens, Andres

174

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities  

E-Print Network (OSTI)

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities #3; Rajiv Gandhi y Eran-hard as it generalizes the well-known vertex cover problem. Previously, approximation algorithms with an approximation version of this problem is at least as hard as set cover; in addition, they developed a 3-approximation

Srinivasan, Aravind

175

Squark and gluino production with jets  

SciTech Connect

We present cross section predictions for squark and gluino production at the LHC, in association with up to two additional hard jets. These cross sections can be very large in comparison to the inclusive Born rates. Because hadron collider experiments utilize hard jets in the reconstruction of cascade decays or as a way to separate squark and gluino production, the understanding of these processes is crucial. We show to what degree hard jet radiation can be described by shower algorithms and point out how tuning these showers, for example to top quark pair production, could help reduce theoretical uncertainties for new physics searches at the LHC.

Plehn, T.; /Munich, Max Planck Inst.; Rainwater, D.; /Rochester U.; Skands, P.; /Fermilab

2005-10-01T23:59:59.000Z

176

Free-energy density functional for hard spheres  

Science Journals Connector (OSTI)

A free-energy density functional for a system of hard spheres is derived on a semiempirical basis. It is constructed to reproduce the thermodynamics and direct correlation function of a homogeneous fluid and then is tested in two highly inhomogeneous situations: the hard-wall–hard-sphere interface and the hard-sphere solid. The results are very good in both cases, showing that this density-functional model may be used with advantage in the study of the hard-sphere model by itself, or used as a reference system in a perturbative analysis.

P. Tarazona

1985-04-01T23:59:59.000Z

177

Pseudomonas syringae Coordinates Production of a Motility-Enabling Surfactant with Flagellar Assembly  

Science Journals Connector (OSTI)

...active motility. Alternatively, surfactant production was recently observed to reduce water retention in soils via a reduction in the soil-water...might enable the passive wicking of surfactant producers through porous material...

Adrien Y. Burch; Briana K. Shimada; Sean W. A. Mullin; Christopher A. Dunlap; Michael J. Bowman; Steven E. Lindow

2011-12-22T23:59:59.000Z

178

Porous platinum-based catalysts for oxygen reduction  

DOE Patents (OSTI)

A porous metal that comprises platinum and has a specific surface area that is greater than 5 m.sup.2/g and less than 75 m.sup.2/g. A fuel cell includes a first electrode, a second electrode spaced apart from the first electrode, and an electrolyte arranged between the first and the second electrodes. At least one of the first and second electrodes is coated with a porous metal catalyst for oxygen reduction, and the porous metal catalyst comprises platinum and has a specific surface area that is greater than 5 m.sup.2/g and less than 75 m.sup.2/g. A method of producing a porous metal according to an embodiment of the current invention includes producing an alloy consisting essentially of platinum and nickel according to the formula Pt.sub.xNi.sub.1-x, where x is at least 0.01 and less than 0.3; and dealloying the alloy in a substantially pH neutral solution to reduce an amount of nickel in the alloy to produce the porous metal.

Erlebacher, Jonah D; Snyder, Joshua D

2014-11-25T23:59:59.000Z

179

Thin Porous Metal Sheet-Supported NaA Zeolite Membrane for Water...  

NLE Websites -- All DOE Office Websites (Extended Search)

Thin Porous Metal Sheet-Supported NaA Zeolite Membrane for WaterEthanol Separation. Thin Porous Metal Sheet-Supported NaA Zeolite Membrane for WaterEthanol Separation. Abstract:...

180

In Situ One-Step Synthesis of Hierarchical Nitrogen-Doped Porous...  

NLE Websites -- All DOE Office Websites (Extended Search)

One-Step Synthesis of Hierarchical Nitrogen-Doped Porous Carbon for High Performance Supercapacitors. In Situ One-Step Synthesis of Hierarchical Nitrogen-Doped Porous Carbon for...

Note: This page contains sample records for the topic "hard porous product" 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

Etch-free Formation of Porous Silicon by High-energy Ion Irradiation...  

NLE Websites -- All DOE Office Websites (Extended Search)

these porous networks are discussed. Citation: Perez-Bergquist AG, FU Naab, Y Zhang, and LM Wang.2011."Etch-free Formation of Porous Silicon by High-energy Ion Irradiation."Nuclear...

182

Lattice Boltzmann Simulation of Mixed Convection in a Driven Cavity Packed with Porous Medium  

Science Journals Connector (OSTI)

The problem of mixed convection in a driven cavity packed with porous medium is studied with lattice Boltzmann method. A lattice Boltzmann model for incompressible flow in porous media and another thermal lattice

Zhenhua Chai; Zhaoli Guo; Baochang Shi

2007-01-01T23:59:59.000Z

183

Discrete particle transport in porous media : discrete observations of physical mechanisms influencing particle behavior  

E-Print Network (OSTI)

An understanding of how discrete particles in the micron to submicron range behave in porous media is important to a number of environmental problems. Discrete particle behavior in the interior of a porous medium is complex ...

Yoon, Joon Sik, 1973-

2005-01-01T23:59:59.000Z

184

High-performance anode based on porous Co3O4 nanodiscs. | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

performance anode based on porous Co3O4 nanodiscs. High-performance anode based on porous Co3O4 nanodiscs. Abstract: In this article, two-dimensional, Co3O4 hexagonal nanodiscs are...

185

Reduced graphene oxide/porous Si composite as anode for high-performance lithium ion batteries  

Science Journals Connector (OSTI)

Reduced graphene oxide/porous Si composite was fabricated through ... subsequent dispersing porous Si in the suspension of graphene oxide followed by reduced process. The electrochemical performance of the obtain...

Hua-Chao Tao; Xue-Lin Yang; Lu-Lu Zhang; Shi-Bing Ni

2014-08-01T23:59:59.000Z

186

Hollow Core-Shell Structured Porous Si-C Nanocomposites for Li...  

NLE Websites -- All DOE Office Websites (Extended Search)

Hollow Core-Shell Structured Porous Si-C Nanocomposites for Li-Ion Battery Anodes. Hollow Core-Shell Structured Porous Si-C Nanocomposites for Li-Ion Battery Anodes. Abstract:...

187

Resistance Reduction Induced by Small Electric Current in CoCu Porous Films  

Science Journals Connector (OSTI)

Resistance Reduction Induced by Small Electric Current in CoCu Porous Films ... The investigation of electrics discovered that resistance reduction could be induced by a small electric current in these ferromagnetic porous films. ...

Zhigang Li; Weiping Cai; Peisheng Liu; Qintao Li; Liangjian Zou

2010-01-20T23:59:59.000Z

188

TABL Longer Hard Hat description-Sept 26.PDF  

NLE Websites -- All DOE Office Websites (Extended Search)

Hat Use and Inspection Hat Use and Inspection Hard hats are an important piece of personal protective equipment (PPE). Hard hats worn at Berkeley Lab must comply with the requirements of ANSI Z89.1 for impact protection and electrical performance. PPE can only be effective if it is used properly and the wearer understands its limitations, care, and maintenance. OSHA 29 CFR 1910.132 requires that PPE be maintained in a sanitary and reliable condition. Defective or damaged equipment should never be used. To inspect PPE, emp loyees should follow manufacturer's recommendations for specific inspection procedures. Hard Hat Inspection - Bullard Hard Hats Bullard 3000 hard hats are available at LBL Central Stores, located in B78. Bullard User Information provides detailed inspection procedures for all Bullard hard hats.

189

High Co2 Emissions Through Porous Media- Transport Mechanisms And  

Open Energy Info (EERE)

Co2 Emissions Through Porous Media- Transport Mechanisms And Co2 Emissions Through Porous Media- Transport Mechanisms And Implications For Flux Measurement And Fractionation Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: High Co2 Emissions Through Porous Media- Transport Mechanisms And Implications For Flux Measurement And Fractionation Details Activities (1) Areas (1) Regions (0) Abstract: Diffuse emissions of CO2 are known to be large around some volcanoes and hydrothermal areas. Accumulation-chamber measurements of CO2 flux are increasingly used to estimate the total magmatic or metamorphic CO2 released from such areas. To assess the performance of accumulation chamber systems at fluxes one to three orders of magnitude higher than normally encountered in soil respiration studies, a test system was

190

Some properties of convective oscillations in porous medium  

SciTech Connect

Convective oscillations in porous media are studied numerically. A two-dimensional square, differentially heated cavity, filled with a saturated porous medium, is considered subject to linear harmonic oscillations in the vertical direction. The formulation is based on the Darcy-Boussinesq model. The problem includes three nondimensional parameters: the Rayleigh number for porous media Ra, its vibrational analog Ra{sub v}, and the nondimensional frequency f. The time-dependent Darcy-Boussinesq equations have been solved using a pseudo-spectral Chebyshev collocation method. The instantaneous fields of the established oscillatory regimes are presented. Also, some instantaneous and mean characteristics are studied and discussed. The distinctions from the case of viscous fluid alone are emphasized.

Khallouf, H.; Mojitabi, A. [Univ. Paul Sabatier, Toulouse (France); Gershuni, G.Z. [Perm State Univ. (Russian Federation). Dept. of Theoretical Physics

1996-11-08T23:59:59.000Z

191

Porous siliconformation and etching process for use in silicon micromachining  

DOE Patents (OSTI)

A reproducible process for uniformly etching silicon from a series of micromechanical structures used in electrical devices and the like includes providing a micromechanical structure having a silicon layer with defined areas for removal thereon and an electrochemical cell containing an aqueous hydrofluoric acid electrolyte. The micromechanical structure is submerged in the electrochemical cell and the defined areas of the silicon layer thereon are anodically biased by passing a current through the electrochemical cell for a time period sufficient to cause the defined areas of the silicon layer to become porous. The formation of the depth of the porous silicon is regulated by controlling the amount of current passing through the electrochemical cell. The micromechanical structure is then removed from the electrochemical cell and submerged in a hydroxide solution to remove the porous silicon. The process is subsequently repeated for each of the series of micromechanical structures to achieve a reproducibility better than 0.3%.

Guilinger, Terry R. (Albuquerque, NM); Kelly, Michael J. (Albuquerque, NM); Martin, Jr., Samuel B. (Albuquerque, NM); Stevenson, Joel O. (Albuquerque, NM); Tsao, Sylvia S. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

192

Method for dialysis on microchips using thin porous polymer membrane  

DOE Patents (OSTI)

Laser-induced phase-separation polymerization of a porous acrylate polymer is used for in-situ fabrication of dialysis membranes inside glass microchannels. A shaped 355 nm laser beam is used to produce a porous polymer membrane with a thickness of about 15 .mu.m, which bonds to the glass microchannel and forms a semi-permeable membrane. Differential permeation through a membrane formed with pentaerythritol triacrylate was observed and quantified by comparing the response of the membrane to fluorescein and fluorescently tagging 200 nm latex microspheres. Differential permeation was observed and quantified by comparing the response to rhodamine 560 and lactalbumin protein in a membrane formed with SPE-methylene bisacrylamide. The porous membranes illustrate the capability for the present technique to integrate sample cleanup into chip-based analysis systems.

Singh, Anup K. (San Francisco, CA); Kirby, Brian J. (San Francisco, CA); Shepodd, Timothy J. (Livermore, CA)

2009-05-19T23:59:59.000Z

193

Dialysis on microchips using thin porous polymer membranes  

DOE Patents (OSTI)

Laser-induced phase-separation polymerization of a porous acrylate polymer is used for in-situ fabrication of dialysis membranes inside glass microchannels. A shaped 355 nm laser beam is used to produce a porous polymer membrane with a thickness of about 15 .mu.m, which bonds to the glass microchannel and form a semi-permeable membrane. Differential permeation through a membrane formed with pentaerythritol triacrylate was observed and quantified by comparing the response of the membrane to fluorescein and fluorescently tagging 200 nm latex microspheres. Differential permeation was observed and quantified by comparing the response to rhodamine 560 and lactalbumin protein in a membrane formed with SPE-methylene bisacrylamide. The porous membranes illustrate the capability for the present technique to integrate sample cleanup into chip-based analysis systems.

Singh, Anup K. (San Francisco, CA); Kirby, Brian J. (San Francisco, CA); Shepodd, Timothy J. (Livermore, CA)

2007-09-04T23:59:59.000Z

194

Anisotropy of flow in stochastically generated porous media  

E-Print Network (OSTI)

Models of porous media are often applied to relatively small systems, which leads not only to system-size-dependent results, but also to phenomena that would be absent in larger systems. Here we investigate one such finite-size effect: anisotropy of the permeability tensor. We show that a non-zero angle between the external body force and macroscopic flux vector exists in three-dimensional periodic models of sizes commonly used in computer simulations and propose a criterion, based on the system size to the grain size ratio, for this phenomenon to be relevant or negligible. The finite-size anisotropy of the porous matrix induces a pressure gradient perpendicular to the axis of a porous duct and we analyze how this effect scales with the system and grain sizes.

Matyka, Maciej; Go?embiewski, Jaros?aw; Kostur, Marcin; Januszewski, Micha?

2013-01-01T23:59:59.000Z

195

Shock compression synthesis of hard materials  

SciTech Connect

The purpose of this research was to adapt the high explosives technology that was developed in conjunction with nuclear weapons programs to subjecting materials to ultra-high pressures and to explore the utility of this technique for the synthesis of hard materials. The research was conducted in collaboration with researchers at the University of Texas, Texas Tech University and Pantex (Mason and Hanger Corp.). The group designed, modeled, built, and tested a new device that allows quantitative recovery of grams of material that have been subjected to unprecedented pressures. The modeling work was done at Texas Tech and Pantex. The metal parts and material samples were made at the University of Texas, and Pantex machined the explosives, assembled the devices and conducted the detonations. Sample characterization was carried out at the University of Texas and Texas Tech.

Willson, C.G. [Univ. of Texas, Austin, TX (United States). Dept. of Chemistry

1999-03-01T23:59:59.000Z

196

Design and manipulation of 1-D rugate photonic crystals of porous silicon for chemical sensing applications  

E-Print Network (OSTI)

et al. Microhotplate platforms for chemical sensor research.advantages as a chemical sensing platform. The porous layer

King, Brian Henry

2010-01-01T23:59:59.000Z

197

Low-frequency dilatational wave propagation through unsaturated porous media containing two immiscible fluids  

E-Print Network (OSTI)

of elastic waves in unconsolidated unsaturated granularfrequency in both unconsolidated and consolidated materialsboth consolidated and unconsolidated porous media, and the

Lo, W.-C.

2009-01-01T23:59:59.000Z

198

Transport in Porous Media 52: 185211, 2003. 2003 Kluwer Academic Publishers. Printed in the Netherlands.  

E-Print Network (OSTI)

in the Netherlands. 185 Wettability Alteration to Intermediate Gas-Wetting in Porous Media at Elevated Temperatures

Firoozabadi, Abbas

199

Transport in Porous Media 57: 125152, 2004. 2004 Kluwer Academic Publishers. Printed in the Netherlands.  

E-Print Network (OSTI)

in the Netherlands. 125 Relative Permeabilities for Strictly Hyperbolic Models of Three-Phase Flow in Porous Media

Patzek, Tadeusz W.

200

Radiation Hard AlGaN Detectors and Imager  

SciTech Connect

Radiation hardness of AlGaN photodiodes was tested using a 65 MeV proton beam with a total proton fluence of 3x10{sup 12} protons/cm{sup 2}. AlGaN Deep UV Photodiode have extremely high radiation hardness. These new devices have mission critical applications in high energy density physics (HEDP) and space explorations. These new devices satisfy radiation hardness requirements by NIF. NSTec is developing next generation AlGaN optoelectronics and imagers.

None

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

A Facile synthesis of flower-like Co{sub 3}O{sub 4} porous spheres for the lithium-ion battery electrode  

SciTech Connect

The porous hierarchical spherical Co{sub 3}O{sub 4} assembled by nanosheets have been successfully fabricated. The porosity and the particle size of the product can be controlled by simply altering calcination temperature. SEM, TEM and SAED were performed to confirm that mesoporous Co{sub 3}O{sub 4} nanostructures are built-up by numerous nanoparticles with random attachment. The BET specific surface area and pore size of the product calcined at 280 deg. C are 72.5 m{sup 2} g{sup -1} and 4.6 nm, respectively. Our experiments further demonstrated that electrochemical performances of the synthesized products working as an anode material of lithium-ion battery are strongly dependent on the porosity. - Graphical abstract: The flower-like Co{sub 3}O{sub 4} porous spheres with hierarchical structure have been successfully prepared via a simple calcination process using cobalt hydroxide as precursor.

Zheng Jun; Liu Jing; Lv Dongping; Kuang Qin [State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (China); Jiang Zhiyuan, E-mail: zyjiang@xmu.edu.c [State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (China); Xie Zhaoxiong; Huang Rongbin; Zheng Lansun [State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005 (China)

2010-03-15T23:59:59.000Z

202

Raman Spectroscopy Characterization of amorphous carbon coatings for computer hard disks  

SciTech Connect

Amorphous carbon films are used as protective coatings on magnetic media to protect the magnetic layer from wear and abrasion caused by the read/write head during hard disk drive start-up and operation. A key requirement in increasing the storage capacity and reliability of hard-disk drives is improving the performance of these coatings. This cooperative agreement used optical characterization techniques developed at LBNL to study thin-film hard disk media produced by Seagate Technology, major US hard drive manufacturer. The chief scientific goal was relating quantitatively the results of the optical characterization to the underlying chemical structure of the overcoat. In a collaboration with Seagate, LBNL, and Cambridge University, optical and electron-based characterization were used to evaluate the chemical structure of overcoats. The sp3 fraction of the sputtered amorphous carbon films was measured quantitatively for the first time and related to the optical spectroscopy results. This work and other selected aspects of the research performed under the agreement were presented at technical meetings and published in the open literature. The chief technical goal was designing manufacturing processes for the protective carbon overcoat for use in new generations of Seagate disk drives. To this end, joint research carried out under this agreement enabled Seagate to speed development of new coatings which are currently being used in the production of disk media in Seagate's disk-media manufacturing plants in Fremont, CA.

Ager III, Joel W.

1998-05-07T23:59:59.000Z

203

Hard Bottom Substrate Monitoring Horns Rev Offshore Wind Farm  

E-Print Network (OSTI)

#12;Hard Bottom Substrate Monitoring Horns Rev Offshore Wind Farm Annual Status Report 2004............................................................................................................... 13 2.3. Test fishing.................................................................................................................................. 17 3.1. Fish observed

204

Peer Reviewed: Hard Times for Innovative Cleanup Technology  

Science Journals Connector (OSTI)

Peer Reviewed: Hard Times for Innovative Cleanup Technology ... What can be done to remove market barriers to new groundwater and soil remediation technologies? ...

Jacqueline A. MacDonald

2011-06-08T23:59:59.000Z

205

Multiphase lattice Boltzmann simulations for porous media applications -- a review  

E-Print Network (OSTI)

Over the last two decades, lattice Boltzmann methods have become an increasingly popular tool to compute the flow in complex geometries such as porous media. In addition to single phase simulations allowing, for example, a precise quantification of the permeability of a porous sample, a number of extensions to the lattice Boltzmann method are available which allow to study multiphase and multicomponent flows on a pore scale level. In this article we give an extensive overview on a number of these diffuse interface models and discuss their advantages and disadvantages. Furthermore, we shortly report on multiphase flows containing solid particles, as well as implementation details and optimization issues.

Liu, Haihu; Leonardi, Christopher R; Jones, Bruce D; Schmieschek, Sebastian; Narváez, Ariel; Williams, John R; Valocchi, Albert J; Harting, Jens

2014-01-01T23:59:59.000Z

206

Displacement of oil from porous material with carbonated water  

E-Print Network (OSTI)

DISPLACEMENT OF OIL FROM POROUS MATERIAL WITH CARBONATED WATER A Thesis By JAGJIT S. YADAV Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August... 1967 Ma/or Sub)act; Petroleum Engineering DISPLACEMENT OF OIL FROM POROUS MATERIAL WITH CARBONATED WATER A Thesis By JAGJIT ST YADAV Approved as to style and content by: ( ai an of Committee) cZ&-& 3~ ~" (Head of Department) (Member) (Member...

Yadav, Jagjit Singh

1967-01-01T23:59:59.000Z

207

Evaluation of bacterial detachment rates in porous media  

SciTech Connect

The ability of published biomass detachment rate expressions to describe experimental data obtained from porous media reactors using Pseudomonas aeruginosa grown aerobically on glucose was evaluated. A first-order rate expression on attached biomass concentration best reflected effluent substrate concentration for combined data sets. Detachment rate coefficient k{sub d1} was dependent on initial substrate concentration. Simulation of porous media reactor experiments indicated that responses using higher influent substrate concentrations possessed greater sensitivity to variations in k{sub d1}. Simulations of field bioremediation systems suggest the use of accurate biofilm development kinetics is important in the prediction of well bore biofouling.

Peyton, B.M.; Hooker, B.S.; Skeen, R.S. [Pacific Northwest Lab., Richland, WA (United States); Cunningham, A.B.; Lundman, R.W. [Montana State Univ., Bozeman, MT (United States)

1994-05-01T23:59:59.000Z

208

On the Effect of Porous Layers on Melting Heat Transfer in an Enclosure  

E-Print Network (OSTI)

On the Effect of Porous Layers on Melting Heat Transfer in an Enclosure E. A. Ellinger* and C. To enhance heat transfer, the porous layers are located in regions where the melting rates for a pure the porous layer and the pure fluid layer cause strong variations in heat transfer, melt convection

Beckermann, Christoph

209

Porous silicon with embedded tritium as a stand-alone prime power source for optoelectronic applications  

DOE Patents (OSTI)

Disclosed is an illumination source comprising a porous silicon having a source of electrons on the surface and/or interstices thereof having a total porosity in the range of from about 50 v/o to about 90 v/o. Also disclosed are a tritiated porous silicon and a photovoltaic device and an illumination source of tritiated porous silicon. 1 fig.

Tam, S.W.

1997-02-25T23:59:59.000Z

210

Porous silicon with embedded tritium as a stand-alone prime power source for optoelectronic applications  

DOE Patents (OSTI)

An illumination source comprising a porous silicon having a source of electrons on the surface and/or interticies thereof having a total porosity in the range of from about 50 v/o to about 90 v/o. Also disclosed are a tritiated porous silicon and a photovoltaic device and an illumination source of tritiated porous silicon.

Tam, Shiu-Wing (Downers Grove, IL)

1997-01-01T23:59:59.000Z

211

Porous silicon with embedded tritium as a stand-alone prime power source for optoelectronic applications  

DOE Patents (OSTI)

An illumination source comprising a porous silicon having a source of electrons on the surface and/or interticies thereof having a total porosity in the range of from about 50 v/o to about 90 v/o. Also disclosed are a tritiated porous silicon and a photovoltaic device and an illumination source of tritiated porous silicon.

Tam, Shiu-Wing (Downers Grove, IL)

1998-01-01T23:59:59.000Z

212

Porous silicon with embedded tritium as a stand-alone prime power source for optoelectronic applications  

DOE Patents (OSTI)

An illumination source is disclosed comprising a porous silicon having a source of electrons on the surface and/or interstices thereof having a total porosity in the range of from about 50 v/o to about 90 v/o. Also disclosed are a tritiated porous silicon and a photovoltaic device and an illumination source of tritiated porous silicon. 1 fig.

Tam, S.W.

1998-06-16T23:59:59.000Z

213

Porous Al alloys by local melting and diffusion of metal powders  

SciTech Connect

A novel method exploiting local melt and diffusion induced porosity is described for producing porous Al alloys. Aluminum powder and zinc powder were blended and cold-compacted to a near net shape. A porous Al-Zn alloy component was then formed by annealing the material above the melting point of zinc but below the solidus temperature of the alloy. Pores were generated by the diffusion of molten Zn into the solid Al grains. The pore structure is shown to be determined by the volume fraction, distribution, and size of the Zn powders in the powder mixture, and by time and temperature of the annealing heat treatment. The pores can be further expanded by incorporating small amounts of titanium hydride into the powder blend and conducting the annealing treatment above the decomposition temperature of the titanium hydride (T > 447 C). Porosity levels of 45 vol.% have been achieved to date. This processing approach appears amenable to the production of sandwich panels with a gradient porosity core and fully dense face sheets, and is applicable to other solid solution systems.

Wang, N.; Starke, E.A. Jr.; Wadley, H.N.G. [Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

1998-12-31T23:59:59.000Z

214

Hard-sphere and hard-disk freezing from the differential formulation of the generalized effective liquid approximation  

Science Journals Connector (OSTI)

We apply the differential formulation of the generalized effective liquid approximation to the study of hard-sphere and hard-disk freezing. We show that the thermodynamic properties of the solid phase are rather insensitive to the compressibility factor of the fluid phase used to map the solid onto the effective liquid. The solid-fluid coexistence data instead are quite dependent on the equation of state describing the fluid phase. Very accurate results, as compared with the simulation data, are obtained for both the freezing of hard spheres and hard disks.

C. F. Tejero and J. A. Cuesta

1993-01-01T23:59:59.000Z

215

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities  

E-Print Network (OSTI)

of this problem is at least as hard as set cover; they have also developed a 3-approximation algorithm cover problem. Key Words and Phrases: Approximation algorithms, capacitated covering, set cover, vertexAn Improved Approximation Algorithm For Vertex Cover with Hard Capacities (Extended Abstract) Rajiv

Khuller, Samir

216

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities  

E-Print Network (OSTI)

as hard as set cover; they have also developed a 3-approximation algorithm for the unweighted version. We Words and Phrases: Approximation algorithms, capacitated covering, set cover, vertex cover, linearAn Improved Approximation Algorithm For Vertex Cover with Hard Capacities (Extended Abstract) Rajiv

Srinivasan, Aravind

217

Viscosity, hard sphere diameter and interionic potential for liquid lead  

E-Print Network (OSTI)

L-347 Viscosity, hard sphere diameter and interionic potential for liquid lead G. Chaussemy The Macedo-Litovitz equation for a hard sphere liquid provides a satisfactory model for the viscosity of lead and molecular dynamics. The activation energy for viscosity (0.07 eV) is similar to the height of the interionic

Boyer, Edmond

218

Managing hard-disk PCs in the introductory laboratory  

Science Journals Connector (OSTI)

A method is described for managing stand-alone hard-disk PCs, in an environment in which students are allowed to explore the hard disk. The system, application, and student-created files are safeguarded by management software which helps eliminate "accidental" ...

David K. Walker; David S. Tucker

1991-11-01T23:59:59.000Z

219

Integrating Structure Control over Multiple Length Scales in Porous High  

E-Print Network (OSTI)

temperature catalytic applications for their high surface area and low flow resistance in combination with thermal and chemical stability. We have developed a bottom-up approach to functional, porous, high results in three-dimensionally interconnected, high-temperature ceramic materials functionalized with well

Gruner, Sol M.

220

COMPARISON OF VARIOUS FORMULATIONS OF THREEPHASE FLOW IN POROUS MEDIA  

E-Print Network (OSTI)

permeability and capillary pressure curves satisfy a so­called total differential condition, the pseudo­global, oil, and gas) flow in porous media, including phase, global, and pseudo­global pressure and numerically presented for the first time. It is shown that the global pressure­saturation formulation

Note: This page contains sample records for the topic "hard porous product" 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

Cathode porous transport irreversibility model for PEM fuel cell design  

Science Journals Connector (OSTI)

The influence is studied of slip-irreversibility at the interface between the gas diffusion layer, also referred to here as the porous transport layer, and the catalyst layer of a proton exchange membrane fuel cell (PEMFC). A two-dimensional cathode ... Keywords: catalyst layer, exergy, gas diffusion layer, slip flow irreversibility

E. O. B. Ogedengbe; M. A. Rosen

2009-02-01T23:59:59.000Z

222

Surface wettability of oxygen plasma treated porous silicon  

Science Journals Connector (OSTI)

Oxygen plasma treatment on porous silicon (p-Si) surfaces was studied as a practical and effective means to modify wetting properties of as-fabricated p-Si surfaces, that is, contact angles of the p-Si materials. P-Si samples spanning a wide range of ...

Lei Jiang, Songyan Li, Jiqian Wang, Limin Yang, Qian Sun, Zhaomin Li

2014-01-01T23:59:59.000Z

223

Numerical simulation of fluid flow in porous/fractured media  

SciTech Connect

Theoretical models of fluid flow in porous/fractured media can help in the design of in situ fossil energy and mineral extraction technologies. Because of the complexity of these processes, numerical solutions are usually required. Sample calculations illustrate the capabilities of present day computer models.

Travis B.J.; Cook, T.L.

1981-01-01T23:59:59.000Z

224

Method for the preparation of ferrous low carbon porous material  

SciTech Connect

A method for preparing a porous metal article using a powder metallurgy forming process is provided which eliminates the conventional steps associated with removing residual carbon. The method uses a feedstock that includes a ferrous metal powder and a polycarbonate binder. The polycarbonate binder can be removed by thermal decomposition after the metal article is formed without leaving a carbon residue.

Miller, Curtis Jack

2014-05-27T23:59:59.000Z

225

ORIGINAL PAPER Conditional simulations of wateroil flow in heterogeneous porous  

E-Print Network (OSTI)

water standards. Thus, a small amount of NAPL can contaminate large volumes of groundwater over a long period of time. Therefore, it is very important to understand the processes associated with contaminant is a complicated mixture of hydrocarbon fluids, brine, porous rock and fractures. The structure of the void space

Lu, Zhiming

226

NMRI methods for characterizing fluid flow in porous media  

E-Print Network (OSTI)

for fluids in porous media are very small and the NMR signals decay very fast. Furthermore, a narrow pulse approximation concept was applied so that the velocities of spins don't have to be assumed constant during the entire observation time. Preliminary...

Yao, Xiaoli

2012-06-07T23:59:59.000Z

227

Acoustics in Porous Media. - Department of Mathematics, Purdue ...  

E-Print Network (OSTI)

Time histories observed at a receiver for a porous rock saturated by gas, .... The average quality factors: Qp = 10.5 (from left) and Qs = 5.5 (from right) are in ... In geophysical prospecting and reservoir development, knowledge of .... Lamé coefficient (GPa) for the brine-saturated fractal porosity-permeability sample of case 4.

228

Mechanistic Foam Flow Simulation in Heterogeneous and Multidimensional Porous Media  

E-Print Network (OSTI)

that is analogous to energy and species mass balances7, 8. Accordingly, a separate conservation equation is written flow is multidimensional and the porous medium is heterogeneous. We have incorporated a conservation are predicted, regardless of whether the layers are communicating or isolated. Introduction Field application

Patzek, Tadeusz W.

229

Electronic Supplementary Material Scalable preparation of porous silicon nanoparticles and  

E-Print Network (OSTI)

and their application for lithium-ion battery anodes Mingyuan Ge1 , Jiepeng Rong1 , Xin Fang1 , Anyi Zhang1 , Yunhao Lu2 with reduced graphene oxide Figure S2 TEM image of porous silicon nanoparticles after carbon coating and graphene wrapping. #12;www.theNanoResearch.comwww.Springer.com/journal/12274 | Nano R

Zhou, Chongwu

230

Supercritical carbon dioxide behavior in porous silica aerogel  

Science Journals Connector (OSTI)

Supercritical carbon dioxide within a porous silica aerogel behaves as a two-phase system formed by a film next to the silica walls and a remaining fluid phase. Small-angle neutron scattering allows one to determine the structural parameters of the involved phases.

Ciccariello, S.

2010-11-27T23:59:59.000Z

231

Pyrolytic carbon electrodes Lithographically Defined Porous Carbon Electrodes**  

E-Print Network (OSTI)

to the intrinsic material properties of carbon, functionalized films can be produced through chemical modification fabrication method capable of producing large area (%100 s cm2 ) submicrometer porous carbon films. In our methodology. The palladium-modified electrodes exhibit a catalytic response for methanol oxidation

New Mexico, University of

232

The Transport of Nuclear Contamination in Fractured Porous Media  

E-Print Network (OSTI)

and dispersion of nuclear contamination through a granitic medium having densely spaced fracturesThe Transport of Nuclear Contamination in Fractured Porous Media Jim Douglas, Jr. #3; Anna M that takes the relevant time scales of the ow and the nuclear decay. 1 Introduction We formulate a model

Douglas Jr., Jim

233

Exponential decay in one-dimensional porous-thermo-elasticity  

E-Print Network (OSTI)

is the equilibrated stress, g is the equilibrated body force and q is the heat flux. The variables u" (BFM2003- 00309) of the Spanish Ministry of Science and Technology. Keywords: porous energy density is a positive definite form. Thus, the constitutive coefficients satisfy the conditions: µ

Politècnica de Catalunya, Universitat

234

Comparison of Three Ni-Hard I Alloys  

Office of Scientific and Technical Information (OSTI)

Comparison of Three Ni-Hard I Alloys Comparison of Three Ni-Hard I Alloys Ö. N. Do-an 1 , J.A. Hawk 1 , and J.Rice 2 1 U.S. Department of Energy, Albany Research Center, Albany, Oregon 2 Texaloy Foundry Co., Inc., Floresville, Texas Keywords: Ni-Hard white irons, Bainite, Martensite, Austenite, Abrasion resistant iron Abstract This report documents the results of an investigation which was undertaken to reveal the similarities and differences in the mechanical properties and microstructural characteristics of three Ni-Hard I alloys. One alloy (B1) is ASTM A532 class IA Ni-Hard containing 4.2 wt. pct. Ni. The second alloy (B2) is similar to B1 but higher in Cr, Si, and Mo. The third alloy (T1) also falls in the same ASTM specification, but it contains 3.3 wt. pct. Ni. The alloys were evaluated in both as-cast and

235

Photon Sciences | Beamlines | HXN: Hard X-ray Nanoprobe  

NLE Websites -- All DOE Office Websites (Extended Search)

HXN: Hard X-ray Nanoprobe HXN: Hard X-ray Nanoprobe Poster | Fact Sheet | Preliminary Design Report Scientific Scope The Hard X-ray Nanoprobe beamline and endstation instruments (HXN) will be designed and constructed to explore new frontiers of hard x-ray microscopy applications with the highest achievable spatial resolution. Currently the available spatial resolution for scientific applications, provided by scanning x-ray microscopes in the hard x-ray regime, is limited to ~50nm, which is still insufficient for probing the nanoscale interfacial structures critical in determining properties and functionalities of material and biological systems. The HXN beamline aims to enable x-ray experiments at spatial resolutions ranging from 10 to 30 nm with an ultimate goal of ~1 nm. Beamline Description

236

Amorphization and reduction of thermal conductivity in porous silicon by irradiation with swift heavy ions  

SciTech Connect

In this article, we demonstrate that the thermal conductivity of nanostructured porous silicon is reduced by amorphization and also that this amorphous phase in porous silicon can be created by swift (high-energy) heavy ion irradiation. Porous silicon samples with 41%-75% porosity are irradiated with 110 MeV uranium ions at six different fluences. Structural characterisation by micro-Raman spectroscopy and SEM imaging show that swift heavy ion irradiation causes the creation of an amorphous phase in porous Si but without suppressing its porous structure. We demonstrate that the amorphization of porous silicon is caused by electronic-regime interactions, which is the first time such an effect is obtained in crystalline silicon with single-ion species. Furthermore, the impact on the thermal conductivity of porous silicon is studied by micro-Raman spectroscopy and scanning thermal microscopy. The creation of an amorphous phase in porous silicon leads to a reduction of its thermal conductivity, up to a factor of 3 compared to the non-irradiated sample. Therefore, this technique could be used to enhance the thermal insulation properties of porous Si. Finally, we show that this treatment can be combined with pre-oxidation at 300 Degree-Sign C, which is known to lower the thermal conductivity of porous Si, in order to obtain an even greater reduction.

Newby, Pascal J. [Institut des Nanotechnologies de Lyon, Universite de Lyon, INL-UMR5270, CNRS, INSA de Lyon, Villeurbanne 69621 (France); Institut Interdisciplinaire d'Innovation Technologique (3IT), Universite de Sherbrooke, CNRS UMI-LN2, Sherbrooke, Quebec J1K0A5 (Canada); Canut, Bruno; Bluet, Jean-Marie; Lysenko, Vladimir [Institut des Nanotechnologies de Lyon, Universite de Lyon, INL-UMR5270, CNRS, INSA de Lyon, Villeurbanne 69621 (France); Gomes, Severine [Centre de Thermique de Lyon, Universite de Lyon, CETHIL-UMR5008, CNRS, INSA de Lyon, Villeurbanne 69621 (France); Isaiev, Mykola; Burbelo, Roman [Faculty of Physics, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrs'ka St., Kyiv 01601 (Ukraine); Termentzidis, Konstantinos [Laboratoire LEMTA, Universite de Lorraine-CNRS UMR 7563, 54506 Vandoeuvre-les-Nancy cedex (France); Chantrenne, Patrice [Universite de Lyon, INSA de Lyon, MATEIS-UMR CNRS 5510, Villeurbanne 69621 (France); Frechette, Luc G. [Institut Interdisciplinaire d'Innovation Technologique (3IT), Universite de Sherbrooke, CNRS UMI-LN2, Sherbrooke, Quebec J1K0A5 (Canada)

2013-07-07T23:59:59.000Z

237

Thermal and concentration-induced instability in porous media  

SciTech Connect

Exothermic chemical reactions can influence natural convection effects in a porous medium. Such phenomena may occur in tubular reactors, oxidation of solid material in large containers, chemical vapor deposition systems, liquid explosives, and others. Experimental evidence indicates that the influence of natural convection in many chemically reacting systems cannot be neglected. In this work, transient effects of a two-dimensional convection generated and sustained by an endothermic chemical reaction and a constant heat flux are studied. The Darcy-Boussinesq equations are used to describe fluid flow through a porous medium with a first-order chemical reaction. The complete mass, energy, and momentum balance equations are solved with the Arakawa-Dufort Frankel numerical scheme, which is particularly suitable for stationary solutions over a range of various parameters.

Carter, J.M.; Islam, M.R. (South Dakota School of Mines and Technology, Rapid City, SD (United States))

1993-01-01T23:59:59.000Z

238

Methods for removing contaminant matter from a porous material  

DOE Patents (OSTI)

Methods of removing contaminant matter from porous materials include applying a polymer material to a contaminated surface, irradiating the contaminated surface to cause redistribution of contaminant matter, and removing at least a portion of the polymer material from the surface. Systems for decontaminating a contaminated structure comprising porous material include a radiation device configured to emit electromagnetic radiation toward a surface of a structure, and at least one spray device configured to apply a capture material onto the surface of the structure. Polymer materials that can be used in such methods and systems include polyphosphazine-based polymer materials having polyphosphazine backbone segments and side chain groups that include selected functional groups. The selected functional groups may include iminos, oximes, carboxylates, sulfonates, .beta.-diketones, phosphine sulfides, phosphates, phosphites, phosphonates, phosphinates, phosphine oxides, monothio phosphinic acids, and dithio phosphinic acids.

Fox, Robert V. (Idaho Falls, ID) [Idaho Falls, ID; Avci, Recep (Bozeman, MT) [Bozeman, MT; Groenewold, Gary S. (Idaho Falls, ID) [Idaho Falls, ID

2010-11-16T23:59:59.000Z

239

Methods for making a porous nuclear fuel element  

SciTech Connect

Porous nuclear fuel elements for use in advanced high temperature gas-cooled nuclear reactors (HTGR's), and to processes for fabricating them. Advanced uranium bi-carbide, uranium tri-carbide and uranium carbonitride nuclear fuels can be used. These fuels have high melting temperatures, high thermal conductivity, and high resistance to erosion by hot hydrogen gas. Tri-carbide fuels, such as (U,Zr,Nb)C, can be fabricated using chemical vapor infiltration (CVI) to simultaneously deposit each of the three separate carbides, e.g., UC, ZrC, and NbC in a single CVI step. By using CVI, the nuclear fuel may be deposited inside of a highly porous skeletal structure made of, for example, reticulated vitreous carbon foam.

Youchison, Dennis L; Williams, Brian E; Benander, Robert E

2014-12-30T23:59:59.000Z

240

Theory of Acoustical Wave Propagation in Porous Media  

Science Journals Connector (OSTI)

A theory is developed for the propagation of sound waves in a rigid isotropic and homogeneous porous medium filled with a compressible fluid including both the effect of viscous dissipation and the effect of thermal comduction. With a capillaric model assumed an expression for the permeability as a function of the frequency is also given. For very low frequencies (isothermal case) and very high frequencies (adiabatic case) the results reduce to those of a theory presented by Morse [J. Acoust. Soc. Amer. 24 696 (1952)]. The present theory can be used to determine the structural parameters of a porous system at a given frequency. Attenuation and phase factors are plotted as functions of a nondimensional frequency parameter for various combinations of the characteristic constants.

P. G. Smith; R. A. Greenkorn

1971-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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.


241

The Uniaxial Tensile Response of Porous and Microcracked Ceramic Materials  

SciTech Connect

The uniaxial tensile stress-strain behavior of three porous ceramic materials was determined at ambient conditions. Test specimens in the form of thin beams were obtained from the walls of diesel particulate filter honeycombs and tested using a microtesting system. A digital image correlation technique was used to obtain full-field 2D in-plane surface displacement maps during tensile loading, and in turn, the 2D strains obtained from displacement fields were used to determine the Secant modulus, Young s modulus and initial Poisson s ratio of the three porous ceramic materials. Successive unloading-reloading experiments were performed at different levels of stress to decouple the linear elastic, anelastic and inelastic response in these materials. It was found that the stress-strain response of these materials was non-linear and that the degree of nonlinearity is related to the initial microcrack density and evolution of damage in the material.

Pandey, Amit [ORNL; Shyam, Amit [ORNL; Watkins, Thomas R [ORNL; Lara-Curzio, Edgar [ORNL; Lara-Curzio, Edgar [ORNL; Stafford, Randall [Cummins, Inc; Hemker, Kevin J [Johns Hopkins University

2014-01-01T23:59:59.000Z

242

Nonlinear Dynamics of Capacitive Charging and Desalination by Porous Electrodes  

E-Print Network (OSTI)

The rapid and efficient exchange of ions between porous electrodes and aqueous solutions is important in many applications, such as electrical energy storage by super-capacitors, water desalination and purification by capacitive deionization (or desalination), and capacitive extraction of renewable energy from a salinity difference. Here, we present a unified mean-field theory for capacitive charging and desalination by ideally polarizable porous electrodes (without Faradaic reactions or specific adsorption of ions) in the limit of thin double layers (compared to typical pore dimensions). We illustrate the theory in the case of a dilute, symmetric, binary electrolyte using the Gouy-Chapman-Stern (GCS) model of the double layer, for which simple formulae are available for salt adsorption and capacitive charging of the diffuse part of the double layer. We solve the full GCS mean-field theory numerically for realistic parameters in capacitive deionization, and we derive reduced models for two limiting regimes wi...

Biesheuvel, P M

2009-01-01T23:59:59.000Z

243

Self-assembled porous media from particle-stabilized emulsions  

E-Print Network (OSTI)

We propose a new mechanism to create self-assembled porous media with highly tunable geometrical properties and permeabilities: We first allow a particle-stabilized emulsion to form from a mixture of two fluids and colloidal particles. Then, either one fluid phase or the particle layer is solidified, which can be achieved by techniques such as polymerization or freezing. Based on computer simulations we demonstrate that modifying only the particle wettability or concentration results in porous structures with a wide range of pore sizes and a permeability that can be varied by up to three orders of magnitude. We then discuss optimization of these properties for self-assembled filters or reactors and conclude that structures based on so-called "bijels" are most suitable candidates.

Stefan Frijters; Jens Harting

2014-08-13T23:59:59.000Z

244

Product Design and Innovation Arthur L. Rosenthal, PhD  

E-Print Network (OSTI)

Draft by October 27 · 10/27 Risk Management - FMEA tool · AS12 Draft FMEA for Project Product - hard copy and PDF by Oct. 29 · 10/29 FMEA Workshop · AS13 Prepare Final Project Prodcut FMEA - hard copy

Vajda, Sandor

245

From Here the Beginning is Hard to Find: Stories  

E-Print Network (OSTI)

From Here the Beginning is Hard to Find, a collection of inter-related short stories, centers around the feelings of loss, both culturally and personally, that result from assimilation in America. The collection follows ...

Lang, Jameelah Jafaar

2010-04-26T23:59:59.000Z

246

On the Hardness of Approximating the Min-Hack Problem  

Science Journals Connector (OSTI)

We show several hardness results for the Minimum Hacking problem, which roughly can be described as the problem of finding the best way to compromise a target node given a few initial compromised nodes in a netwo...

Ramkumar Chinchani; Duc Ha; Anusha Iyer…

2005-05-01T23:59:59.000Z

247

Equation of state for nematics having a cylindrical hard core  

Science Journals Connector (OSTI)

In order to describe nematics having an oblong or disclike molecular structure, a system of hard cylinders is considered. After proposing an equation of state, the thermodynamic behavior is calculated and compared with a system of spherocylinders and with experiment.

S. D. P. Flapper and G. Vertogen

1981-10-01T23:59:59.000Z

248

How to estimate hardness of crystals on a pocket calculator  

SciTech Connect

A generalization of the semiempirical microscopic model of hardness is presented and applied to currently studied borides, carbides, and nitrides of heavy transition metals. The hardness of OsB, OsC, OsN, PtN, RuC, RuB{sub 2}, ReB{sub 2}, OsB{sub 2}, IrN{sub 2}, PtN{sub 2}, and OsN{sub 2} crystals in various structural phases is predicted. It is found that none of the transition metal crystals is superhard, i.e., with hardness greater than 40 GPa. The presented method provides materials researchers with a practical tool in the search for new hard materials.

Simunek, Antonin [Institute of Physics v.v.i., Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 53 Prague (Czech Republic)

2007-05-01T23:59:59.000Z

249

QCD and Hard Diffraction at the LHC  

E-Print Network (OSTI)

As an introduction to QCD at the LHC I give an overview of QCD at the Tevatron, emphasizing the high Q^2 frontier which will be taken over by the LHC. After describing briefly the LHC detectors I discuss high mass diffraction, in particular central exclusive production of Higgs and vector boson pairs. I introduce the FP420 project to measure the scattered protons 420m downstream of ATLAS and CMS.

Michael G. Albrow

2005-09-26T23:59:59.000Z

250

OPEC 1991 results reflect hard times  

SciTech Connect

This paper reports that low crude oil prices and economic tough times in industrial countries cause a lean 1991 for members of the Organization of Petroleum Exporting Countries. OPEC's 1991 annual report the member countries reported an overall loss of $12 billion in 1991 on oil revenues that fell 16.2%. Iraq and Kuwait were not included because of their unusual circumstances in the wake of the Persian Gulf war. Reduced oil revenues reflected a slide to $18.66/bbl in 1991 from $22.26/bbl in 1990 for the average price of OPEC basket crudes. As of last June 5 OPEC's basket crude price has averaged only $17.42/bbl this year, OPEC News Agency (Opecna) reported. First quarter 1992 prices averaged $16.77/bbl, compared wit $19.31/bbl in fourth quarter 1991. The average price jumped 52 cent/bbl the first week in June this year to $19.93/bbl, bouyed by Saudi Arabia's move at the end of May to shift its policy from price moderation to one in favor of higher prices, Opecna the. OPEC members increased production 1% in 1991 to an average 23.28 million b/d in spite of negligible production from Iraq and Kuwait and reduced production from Qatar.

Not Available

1992-07-20T23:59:59.000Z

251

Heat transfer enhancement in a channel with porous baffles  

E-Print Network (OSTI)

, it is difficult to verify numerical simulation. In search of relevant sources for review only one numerical study [5] showed the comparisons with the experimental data in a turbulent flow regime. It will be 4 challenging to numerically simulate the flow... media, which was developed by Vafai and Tien [20] for their numerical simulations, but these studies often used slightly modified types of governing equations. Permeability is important for the given porous medium in momentum transport. It is one...

Ko, Kang-Hoon

2005-02-17T23:59:59.000Z

252

Phase Diagram of Fully Developed Drainage in Porous Media  

SciTech Connect

Using concepts of invasion percolation in a gradient, we develop a phase diagram of fully developed drainage in porous media. The transition between stabilized displacement (where the conventional continuum applies) and fingering is controlled by the change of the sign of the gradient of the percolation probability (from stabilizing to destabilizing). The transition boundary is described by scaling laws. {copyright} {ital 1997} {ital The American Physical Society}

Yortsos, Y.C.; Xu, B. [Petroleum Engineering Program, Department of Chemical Engineering, University of Southern California, Los Angeles, California 90089-1211 (United States)] [Petroleum Engineering Program, Department of Chemical Engineering, University of Southern California, Los Angeles, California 90089-1211 (United States); Salin, D. [Laboratoire Fluides, Automatique et Systemes Thermiques, Universite Paris VI and XI, associated with C.N.R.S. (URA 871), Batiment 502, Campus Universitaire, 91405 Orsay Cedex (France)] [Laboratoire Fluides, Automatique et Systemes Thermiques, Universite Paris VI and XI, associated with C.N.R.S. (URA 871), Batiment 502, Campus Universitaire, 91405 Orsay Cedex (France)

1997-12-01T23:59:59.000Z

253

Dust extinction and absorption: the challenge of porous grains  

E-Print Network (OSTI)

In many models of dusty objects in space the grains are assumed to be composite or fluffy. However, the computation of the optical properties of such particles is still a very difficult problem. We analyze how the increase of grain porosity influences basic features of cosmic dust -- interstellar extinction, dust temperature, infrared bands and millimeter opacity. Porous grains can reproduce the flat extinction across the $3 - 8 \\mkm$ wavelength range measured for several lines of sight by {\\it ISO} and {\\it Spitzer}. Porous grains are generally cooler than compact grains. At the same time, the temperature of very porous grains becomes slightly larger in the case of the EMT-Mie calculations in comparison with the results found from the layered-sphere model. The layered-sphere model predicts a broadening of infrared bands and a shift of the peak position to larger wavelengths as porosity grows. In the case of the EMT-Mie model variations of the feature profile are less significant. It is also shown that the millimeter mass absorption coefficients grow as porosity increases with a faster growth occurring for particles with Rayleigh/non-Rayleigh inclusions. As a result, for very porous particles the coefficients given by two models can differ by a factor of about 3. It is found that an increase of porosity leads to an increase of extinction cross sections at some wavelengths and a decrease at others depending on the grain model. However, this behaviour is sufficient to reproduce the extinction curve in the direction of the star $\\sigma$ Sco using current solar abundances. In the case of the star $\\zeta$ Oph our model requires larger amounts of carbon and iron in the dust-phase than is available.

N. V. Voshchinnikov; V. B. Il'in; Th. Henning; D. N. Dubkova

2005-09-11T23:59:59.000Z

254

Analysis and interpretation of ac impedance data for porous electrodes  

SciTech Connect

Ac impedance spectroscopy has been used to measure the dynamic response of two types of porous gas-diffusion oxygen electrodes in a sulfuric acid electrolyte. Models were developed based on flooded and on thin-film pore structure. The transfer functions of these structures were calculated and the impedance result fitted to the models using a nonlinear least squares program. The results were used to assess the adequacies of the models.

Springer, T.E.; Raistrick, I.D.

1987-01-01T23:59:59.000Z

255

Study of runaway electrons using dosimetry of hard x-ray radiations in Damavand tokamak  

SciTech Connect

In this work several studies have been conducted on hard x-ray emissions of Damavand tokamak based on radiation dosimetry using the Thermoluminescence method. The goal was to understand interactions of runaway electrons with plasma particles, vessel wall, and plasma facing components. Total of 354 GR-200 (LiF:Mg,Cu,P) thermoluminescence dosimeter (TLD) crystals have been placed on 118 points – three TLDs per point – to map hard x-ray radiation doses on the exterior of the vacuum vessel. Results show two distinctive levels of x-ray radiations doses on the exterior of the vessel. The low-dose area on which measured dose is about 0.5 mSv/shot. In the low-dose area there is no particular component inside the vessel. On the contrary, on high-dose area of the vessel, x-ray radiations dose exceeds 30 mSv/shot. The high-dose area coincides with the position of limiters, magnetic probe ducts, and vacuum vessel intersections. Among the high-dose areas, the highest level of dose is measured in the position of the limiter, which could be due to its direct contact with the plasma column and with runaway electrons. Direct collisions of runaway electrons with the vessel wall and plasma facing components make a major contribution for production of hard x-ray photons in Damavand tokamak.

Rasouli, C.; Pourshahab, B.; Rasouli, H. [Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, PO Box 14155-1339, Tehran (Iran, Islamic Republic of)] [Plasma Physics and Nuclear Fusion Research School, Nuclear Science and Technology Research Institute, AEOI, PO Box 14155-1339, Tehran (Iran, Islamic Republic of); Hosseini Pooya, S. M.; Orouji, T. [Radiation Application Research School, Nuclear Science and Technology Research Institute, AEOI, PO Box 14155-1339, Tehran (Iran, Islamic Republic of)] [Radiation Application Research School, Nuclear Science and Technology Research Institute, AEOI, PO Box 14155-1339, Tehran (Iran, Islamic Republic of)

2014-05-15T23:59:59.000Z

256

The Hard X-ray Sky: Recent Observational Progress  

SciTech Connect

The last fifty years have witnessed the birth, development, and maturation to full potential of hard X-ray astrophysics. The primary force driving the history of the field has been the development of space-based instrumentation optimized for getting the maximum science out of observations of high-energy photons from astrophysical sources. Hard X-ray telescopes are leading research in areas such as galactic diffuse emission, galactic transients, and active galactic nuclei.

Gehrels, Neil [NASA/GSFC/ASD/Code 661, Greenbelt, Md 20071 (United States); Cannizzo, John K. [CRESST/UMBC/NASA/GSFC/ASD/Code 661, Greenbelt, Md 20071 (United States)

2009-05-11T23:59:59.000Z

257

Photo-oxidation effects in porous silicon luminescence  

Science Journals Connector (OSTI)

We investigate the photoluminescence (PL) evolution of porous silicon samples when exposed to air in darkness and under illumination. Oxygen incorporation is monitored through ir spectroscopy. Fourier transform infrared measurements show that samples exposed to air in darkness exhibit low oxidation rates whereas its PL spectra remain unchanged. On the other hand, samples exposed to air under illumination show a remarkable change in its PL together with a drastic increase in the oxidation rate. A well defined PL peak starts to grow at the expense of a peak located at lower energies, which is present in the PL spectra of the as-prepared samples. The set of PL spectra obtained during the evolution shows an isostilbic point that suggests the existence of two emitting components kinetically correlated. The application of the factor analysis technique confirms this asseveration and enables us to obtain the spectrum of each single emitting component. The oxidation behavior, together with the shape and evolution of the PL spectra, are explained in terms of the quantum wires hypothesis combined with an oxidation mechanism with significant nucleation. The whole set of results demonstrates that quantum size effects may rule the photo-oxidation of the porous silicon structure, and gives strong support to a quantum confinement model for porous silicon PL.

R. R. Koropecki; R. D. Arce; J. A. Schmidt

2004-05-26T23:59:59.000Z

258

Uranium Oxide Aerosol Transport in Porous Graphite  

SciTech Connect

The objective of this paper is to investigate the transport of uranium oxide particles that may be present in carbon dioxide (CO2) gas coolant, into the graphite blocks of gas-cooled, graphite moderated reactors. The transport of uranium oxide in the coolant system, and subsequent deposition of this material in the graphite, of such reactors is of interest because it has the potential to influence the application of the Graphite Isotope Ratio Method (GIRM). The GIRM is a technology that has been developed to validate the declared operation of graphite moderated reactors. GIRM exploits isotopic ratio changes that occur in the impurity elements present in the graphite to infer cumulative exposure and hence the reactor’s lifetime cumulative plutonium production. Reference Gesh, et. al., for a more complete discussion on the GIRM technology.

Blanchard, Jeremy; Gerlach, David C.; Scheele, Randall D.; Stewart, Mark L.; Reid, Bruce D.; Gauglitz, Phillip A.; Bagaasen, Larry M.; Brown, Charles C.; Iovin, Cristian; Delegard, Calvin H.; Zelenyuk, Alla; Buck, Edgar C.; Riley, Brian J.; Burns, Carolyn A.

2012-01-23T23:59:59.000Z

259

Gas-Phase Diffusion in Porous Media: Comparison of Models Stephen W. Webb  

Office of Scientific and Technical Information (OSTI)

Gas-Phase Diffusion in Porous Media: Comparison of Models Gas-Phase Diffusion in Porous Media: Comparison of Models Stephen W. Webb Sandia National Laboratories Albuquerque, New Mexico 87 185 ABSTRACT Two models are commonly used to analyze gas- phase diffusion in porous media in the presence of advection, the Advective-Dispersive Model (ADM) and the Dusty-gas Model (DGM). The ADM, which is used in TOUGH2, is based on a simple linear addition of advection calculated by Darcy's law and ordinary diffusion using Fick's law with a porosity- tortuosity-gas saturation multiplier to account for the porous medium. Another approach for gas-phase transport in porous media is the Dusty-Gas Model. This model applies the kinetic theory of gases to the gaseous components and the porous media (or "dust") to combine transport due to diffusion and

260

Formation of multiple levels of porous silicon for buried insulators and conductors in silicon device technologies  

DOE Patents (OSTI)

A method of forming a multiple level porous silicon substrate for semiconductor integrated circuits including anodizing non-porous silicon layers of a multi-layer silicon substrate to form multiple levels of porous silicon. At least one porous silicon layer is then oxidized to form an insulating layer and at least one other layer of porous silicon beneath the insulating layer is metallized to form a buried conductive layer. Preferably the insulating layer and conductive layer are separated by an anodization barrier formed of non-porous silicon. By etching through the anodization barrier and subsequently forming a metallized conductive layer, a fully or partially insulated buried conductor may be fabricated under single crystal silicon.

Blewer, Robert S. (Albuquerque, NM); Gullinger, Terry R. (Albuquerque, NM); Kelly, Michael J. (Albuquerque, NM); Tsao, Sylvia S. (Albuquerque, NM)

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

From ‘Green’ Aerogels to Porous Graphite by Emulsion Gelation of Acrylonitrile  

Science Journals Connector (OSTI)

From ‘Green’ Aerogels to Porous Graphite by Emulsion Gelation of Acrylonitrile ... Ambient pressure drying of wet-gels from copolymeri-zation of acrylonitrile and bifunctional cross-linkers either in toluene or in H2O-based emulsions yields structurally similar PAN aerogels, which are converted to monolithic porous carbons and graphite. ... Porous carbons, including carbon (C-) aerogels, are technologically important materials, while polyacrylonitrile (PAN) is the main industrial source of graphite fiber. ...

Anand G. Sadekar; Shruti S. Mahadik; Abhishek N. Bang; Zachary J. Larimore; Clarissa A. Wisner; Massimo F. Bertino; A. Kaan Kalkan; Joseph T. Mang; Chariklia Sotiriou-Leventis; Nicholas Leventis

2011-12-14T23:59:59.000Z

262

Porous Pr(OH)3 Nanostructures as High-Efficient Adsorbents for Dye Removal  

Science Journals Connector (OSTI)

Herein, we report the electrochemical synthesis of porous Pr(OH)3 nanobelt arrays (NBAs), nanowire arrays (NWAs), nanowire bundles (NWBs), nanowires (NWs) and their applications as dye...

zhai, teng; Lu, Xihong; Yu, Minghao; Xie, Shilei; Tong, Yexiang

263

High Performance Computing linear algorithms for two-phase flow in porous media  

E-Print Network (OSTI)

High Performance Computing linear algorithms for two-phase flow in porous media Robert Eymard High Performance Computing techniques. This implies to handle the difficult problem of solving

Paris-Sud XI, Université de

264

Tennessee, Pennsylvania: Porous Power Technologies Improves Lithium Ion Battery, Wins R&D 100 Award  

Office of Energy Efficiency and Renewable Energy (EERE)

Porous Power Technologies, partnered with Oak Ridge National Laboratory (ORNL), developed SYMMETRIX HPX-F, a nanocomposite separator for improved lithium-ion battery technology.

265

Heat transfer modeling at an interface between a porous medium and a free region.  

E-Print Network (OSTI)

??This work deals with the study of heat transfer between a porous medium and a free medium, using multi scale approaches. First, we derive the… (more)

D'hueppe, Aliénor

2011-01-01T23:59:59.000Z

266

Additive Manufacturing Methodology and System for Fabrication of Porous Structures with Functionally Graded Properties.  

E-Print Network (OSTI)

??The focus of this dissertation is on the development of an additive manufacturing system and methodology for fabricating structures with functionally graded porous internal properties… (more)

Vlasea, Mihaela

2014-01-01T23:59:59.000Z

267

E-Print Network 3.0 - anisotropic porous medium Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Mathematics Page: << < 1 2 3 4 5 > >> Page: << < 1 2 3 4 5 > >> 21 Generalized radiative transfer equation for porous medium upscaling: application to the radiative Fourier...

268

Design and manipulation of 1-D rugate photonic crystals of porous silicon for chemical sensing applications  

E-Print Network (OSTI)

Porous Si Sensor on an Arduino Platform 311phototransistor sensor mounted on an Arduino microcontrollerscheme of the low-power Arduino-mounted sensor ..313

King, Brian Henry

2010-01-01T23:59:59.000Z

269

Single molecule studies of meso/macro porous silica materials and gradient films.  

E-Print Network (OSTI)

??The preparation of mesoporous/macroporous silica materials and polarity gradient thin film are introduced in this thesis. These porous silica materials and gradient materials have the… (more)

Ye, Fangmao

2009-01-01T23:59:59.000Z

270

Nano-porous Silicon Microcavity Sensors for Determination of Organic Fuel Mixtures  

Science Journals Connector (OSTI)

We present the preparation and characteristics of liquid-phase sensors based on nano-porous silicon multilayer structures for determination of organic content in gasoline. The...

Pham, Van Hoi; Bui, Huy; Hoang, Le Ha; Nguyen, Thuy Van; Nguyen, The Anh; Pham, Thanh Son; Ngo, Quang Minh

2013-01-01T23:59:59.000Z

271

Transverserly Isotropic Saturated Porous Formations: II. Wave Propagation And Application To Multipole Logging  

E-Print Network (OSTI)

The wavefields generated by monopole and dipole sources in a fluid filled borehole embedded in multilayered transversely isotropic saturated porous formations are studied.

Schmitt, D. P.

1988-01-01T23:59:59.000Z

272

V+jets production at the CMS  

E-Print Network (OSTI)

Measurements of Vector Boson production in association with jets are presented, using p-p collision data at sqrt{s} = 7 TeV. The measurements presented include Z + jets azimuthal correlations, event shapes, vector boson + jets differential cross section measurements, hard double-parton scattering using W + jets events and electroweak Z + forward - backward jet production.

B. Bilin; for the CMS Collaboration

2014-10-22T23:59:59.000Z

273

The Interaction Between SrFeCo0.5O x Ceramic Membranes and Pt/CeZrO2 During Syngas Production from Methane  

Science Journals Connector (OSTI)

Non-porous ceramic membranes with mixed ionic and electronic conductivity have received significant interest as membrane reactor systems for the conversion of methane to higher value products. In this work, th...

Sedigheh Faraji; Karen J. Nordheden; Susan M. Stagg-Williams

2009-08-01T23:59:59.000Z

274

Final Report - Montana State University - Microbial Activity and Precipitation at Solution-Solution Mixing Zones in Porous Media  

SciTech Connect

Background. The use of biological and chemical processes that degrade or immobilize contaminants in subsurface environments is a cornerstone of remediation technology. The enhancement of biological and chemical processes in situ, involves the transport, displacement, distribution and mixing of one or more reactive agents. Biological and chemical reactions all require diffusive transport of solutes to reaction sites at the molecular scale and accordingly, the success of processes at the meter-scale and larger is dictated by the success of phenomena that occur at the micron-scale. However, current understanding of scaling effects on the mixing and delivery of nutrients in biogeochemically dynamic porous media systems is limited, despite the limitations this imposes on the efficiency and effectiveness of the remediation challenges at hand. Objectives. We therefore proposed to experimentally characterize and computationally describe the growth, evolution, and distribution of microbial activity and mineral formation as well as changes in transport processes in porous media that receive two or more reactive amendments. The model system chosen for this project was based on a method for immobilizing 90Sr, which involves stimulating microbial urea hydrolysis with ensuing mineral precipitation (CaCO3), and co-precipitation of Sr. Studies at different laboratory scales were used to visualize and quantitatively describe the spatial relationships between amendment transport and consumption that stimulate the production of biomass and mineral phases that subsequently modify the permeability and heterogeneity of porous media. Biomass growth, activity, and mass deposition in mixing zones was investigated using two-dimensional micro-model flow cells as well as flow cells that could be analyzed using synchrotron-based x-ray tomography. Larger-scale flow-cell experiments were conducted where the spatial distribution of media properties, flow, segregation of biological activity and impact on ancillary constituents (i.e., Sr) was determined. Model simulations accompanied the experimental efforts. Benefits and Outcomes of the Project. The research contributed towards defining the key physical, chemical, and biological processes influencing the form and mobility of DOE priority contaminants (e.g., 60Co, 90Sr, U) in the subsurface. The work conducted and reported herein, will in the future (i) contribute to controlling the juxtaposition of microbial activity, contaminants and amendments, (ii) promote new strategies for delivering amendments, and (iii) allow new approaches for modifying permeability and flow in porous media. We feel that the work has already translated directly to improving the efficiency of amendment based remediation strategies. Products. The results of the project have been published in a number of peer reviewed journal articles. The abstracts and citations to those articles, given in section 2.0 below, make up the bulk of this final report.

Gerlach, Robin [Montana State University

2014-10-31T23:59:59.000Z

275

Copy Service, Production Services  

NLE Websites -- All DOE Office Websites (Extended Search)

Copy Service Copy Service Copying in color or black-and-white from hard copy or electronic files. Paper size up to 13" x 19" in a variety of stocks and colors. Larger Documents (up to 36" wide and 100" long) can be reproduced in Black & White from prints or files and can be saved in a variety of electronic format Variable Data Printing - personalized document production Tab Printing Forms CD/DVD Duplication CD/DVD direct printing Binding Collate documents, insert tab dividers, punch holes for binding Stapling documents up to 1 inch thick Spiral, adhesive and perfect binding. Hard covers also available upon request Folding & Mailing Print and apply mailing addresses and labels Machine fold documents and insert into envelopes for mailing Laminate printed items up to 35" wide.

276

Direct Imagining of Soft-hard Interfaces Enabled by Graphene  

NLE Websites -- All DOE Office Websites (Extended Search)

Direct Imagining of Soft-hard Interfaces Enabled by Graphene Direct Imagining of Soft-hard Interfaces Enabled by Graphene Title Direct Imagining of Soft-hard Interfaces Enabled by Graphene Publication Type Journal Article Year of Publication 2009 Authors Lee, Zonghoon, Ki-Joon Jeon, Albert Dato, Rolf Erni, Thomas J. Richardson, Michael Frenklach, and Velimir Radmilovic Journal NanoLetters Volume 9 Start Page 3365 Issue 9 Pagination 3365-3369 Date Published 09/2009 Abstract Direct imaging of surface molecules and the interfaces between soft and hard materials on functionalized nanoparticles is a great challenge using modern microscopy techniques. We show that graphene, a single atomic layer of sp2-bonded carbon atoms, can be employed as an ultrathin support film that enables direct imaging of molecular layers and interfaces in both conventional and atomic-resolution transmission electron microscopy. An atomic-resolution imaging study of the capping layers and interfaces of citrate-stabilized gold nanoparticles is used to demonstrate this novel capability. Our findings reveal the unique potential of graphene as an ideal support film for atomic-resolution transmission electron microscopy of hard and soft nanomaterials.

277

PUBLISHED ONLINE: 7 APRIL 2013 | DOI: 10.1038/NMAT3598 Adaptive fluid-infused porous films with tunable  

E-Print Network (OSTI)

LETTERS PUBLISHED ONLINE: 7 APRIL 2013 | DOI: 10.1038/NMAT3598 Adaptive fluid-infused porous films for malleable surfaces. As we have recently shown, a liquid infused in a rigid porous substrate develops 1School

Mahadevan, L.

278

Additive manufactured porous titanium structures: Through-process quantification of pore and strut networks  

Science Journals Connector (OSTI)

Abstract Titanium and its alloys are successfully used in aerospace through to marine applications. Selective laser melting (SLM) is an additive manufacturing technique, which promises to allow production of novel Ti structures. However, there is still a paucity of accepted methods for quantifying build quality. The viability of using X-ray microtomography (?CT) to quantify and track changes in morphology of SLM Ti porous structures at each stage of the post-laser melting production was tested, quantifying its quality through process. Quantification was achieved using an accessible volume tool to determine pore and strut sizes. Removal of partially sintered struts by cleaning was visualised and quantified. Eighty-eight percent of the struts broken by the cleaning process were found to have connecting neck diameters of less than 180 ?m with a mean of 109 ?m allowing build criteria to be set. Tracking particles removed during cleaning revealed other methods to improve build design, e.g. avoiding low angle struts that did not sinter well. Partially melted powder particles from strut surfaces were quantified by comparing surface roughness values at each cleaning step. The study demonstrates that ?CT provides not only 3D quantification of structure quality, but also a feedback mechanism, such that improvements to the initial design can be made to create more stable and reliable titanium structures for a wide variety of applications.

Taek Bo Kim; Sheng Yue; Ziyu Zhang; Eric Jones; Julian R. Jones; Peter D. Lee

2014-01-01T23:59:59.000Z

279

Method of preparing thin porous sheets of ceramic material  

DOE Patents (OSTI)

A method of forming thin porous sheets of ceramic material for use as electrodes or other components in a molten carbonate fuel cell is disclosed. The method involves spray drying a slurry of fine ceramic particles in liquid carrier to produce generally spherical agglomerates of high porosity and a rough surface texture. The ceramic particles may include the electrode catalyst and the agglomerates can be calcined to improve mechanical strength. After slurrying with suitable volatile material and binder tape casting is used to form sheets that are sufficiently strong for further processing and handling in the assembly of a high temperature fuel cell.

Swarr, Thomas E. (South Windsor, CT); Nickols, Richard C. (East Hartford, CT); Krasij, Myron (Avon, CT)

1987-03-24T23:59:59.000Z

280

Theory of Acoustical Wave Propagation in Porous Media  

Science Journals Connector (OSTI)

A theory is developed to describe the propagation of sound waves in a rigid isotropic and homogeneous porous medium filled with a compressible fluid including both the effect of viscous dissipation and the effect of thermal conduction. An expression for the conductance as a function of the frequency is derived by assuming a capillaric model. A comparison is made with independent experimental results and close agreement with the theoretical results is obtained. A discussion of the structural parameters including a description of a method for determining their values at a given frequency is also made.

Peter G. Smith; Robert A. Greenkorn

1972-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

Method of preparing thin porous sheets of ceramic material  

DOE Patents (OSTI)

A method of forming thin porous sheets of ceramic material for use as electrodes or other components in a molten carbonate fuel cell is disclosed. The method involves spray drying a slurry of fine ceramic particles in liquid carrier to produce generally spherical agglomerates of high porosity and a rough surface texture. The ceramic particles may include the electrode catalyst and the agglomerates can be calcined to improve mechanical strength. After slurrying with suitable volatile material and binder tape casting is used to form sheets that are sufficiently strong for further processing and handling in the assembly of a high temperature fuel cell.

Swarr, T.E.; Nickols, R.C.; Krasij, M.

1984-05-23T23:59:59.000Z

282

Porous Metal–Organic Frameworks for Heterogeneous Biomimetic Catalysis  

Science Journals Connector (OSTI)

Homogeneous artificial metalloporphyrins can undergo catalytic deactivation via suicidal self-oxidation, which lowers their catalytic activity and sustainability relative to their counterparts in Nature. ... The 3D structure of [Zn2(HCOO)(FeIII(H2O)-TCPP)]·guest (7) is made up of layered network of FeIII-TCPP connected with binuclear Zn2(COO)4 paddle-wheel SBUs, and further linked by formate pillars to homogeneously coordinate with Zn2(COO)4 SBUs (Figure 4a). ... pillar linker DPNI to form a three-dimensional porous structure. ...

Min Zhao; Sha Ou; Chuan-De Wu

2014-02-06T23:59:59.000Z

283

Propagation of harmonic plane waves in a general anisotropic porous solid  

Science Journals Connector (OSTI)

......harmonic plane waves in a general anisotropic porous solid M. D. Sharma...propagation is studied in a general anisotropic poroelastic solid. The presence...upper crust. Anisotropy in shales is an important issue in the...the mechanical behaviour of anisotropic porous solids is important......

M. D. Sharma

2008-03-01T23:59:59.000Z

284

Effects of Thermal Aging on the Mechanical Properties of a Porous-Matrix Ceramic Composite  

E-Print Network (OSTI)

Effects of Thermal Aging on the Mechanical Properties of a Porous-Matrix Ceramic Composite Eric A properties of an all-oxide fiber-reinforced composite following long-term exposure (1000 h) at temperatures of 1000­1200°C in air. The composite of interest derives its damage tolerance from a highly porous matrix

Zok, Frank

285

The mathematical structure of multiphase thermal models of flow in porous media  

E-Print Network (OSTI)

The mathematical structure of multiphase thermal models of flow in porous media By Daniel E.A. van with the formulation and numerical solution of equations for modelling multicomponent, two-phase, thermal fluid flow typical flow behaviour that occurs during fluid injection into a reservoir. Keywords: porous media flow

286

Transp Porous Med DOI 10.1007/s11242-010-9584-x  

E-Print Network (OSTI)

Transp Porous Med DOI 10.1007/s11242-010-9584-x Thermal Analysis of Flow in a Porous Medium Over. Keywords Similarity solution · Wall suction/injection · Stretching surface · Entropy generation · Boundary Injection parameter, fw = -vwL/u0 K K Permeability, m2 L Stretching surface length, m n Power

Bahrami, Majid

287

Macroscale Properties of Porous Media from a Network Model of Bio lm Processes  

E-Print Network (OSTI)

Macroscale Properties of Porous Media from a Network Model of Bio#12;lm Processes Brian J. Suchomel porosity and permeability changes in a porous medium as a result of bio#12;lm buildup in the pore spaces. A bio#12;lm consists of bacteria and extracellular polymeric substances (EPS) bonded together

288

A LATTICE BOLTZMANN MODEL FOR CONVECTION HEAT TRANSFER IN POROUS MEDIA  

E-Print Network (OSTI)

A LATTICE BOLTZMANN MODEL FOR CONVECTION HEAT TRANSFER IN POROUS MEDIA Zhaoli Guo and T. S. Zhao Kong, China A lattice Boltzmann model for convection heat transfer in porous media is proposed-difference, finite-volume, and finite-element methods (e.g., [2, 3]). The lattice Boltzmann method (LBM

Zhao, Tianshou

289

Linking drainage front morphology with gaseous diffusion in unsaturated porous media: A lattice Boltzmann study  

E-Print Network (OSTI)

porous media is analyzed using the lattice Boltzmann method LBM . Flow regimes for immiscible in a physical experiment such as a micromodel. In this study, we use the lattice Boltzmann method LBMLinking drainage front morphology with gaseous diffusion in unsaturated porous media: A lattice

Shor, Leslie McCabe

290

DOI: 10.1002/chem.200901982 Template-Synthesized Porous Silicon Carbide as an Effective Host  

E-Print Network (OSTI)

DOI: 10.1002/chem.200901982 Template-Synthesized Porous Silicon Carbide as an Effective Host, especially those that can work more du- rably under harsh conditions. Silicon carbide (SiC) is a promising has been de- veloped for the fabrication of porous silicon carbide (SiC) by means of sin- tering

Bao, Xinhe

291

Numerical study of natural convection in a vertical porous annulus with discrete heating  

E-Print Network (OSTI)

Numerical study of natural convection in a vertical porous annulus with discrete heating M. Sankar online 20 December 2010 Keywords: Natural convection Annulus Discrete heating Porous medium Radii ratio to discrete heating. The outer wall is maintained iso- thermally at a lower temperature, while the top

Lopez, John M.

292

ENS'05 Paris, France, 14-16 December 2005 CONTROL POROUS PATTERN OF ANODIC ALUMINUM OXIDE  

E-Print Network (OSTI)

ENS'05 Paris, France, 14-16 December 2005 CONTROL POROUS PATTERN OF ANODIC ALUMINUM OXIDE BY FOILS simpler, and low cost method to fabricate porous pattern of the anodic aluminum oxide (AAO) based applications such as sensors, optical devices, catalysts, and microfabricated fluidic devices. Anodic aluminum

Paris-Sud XI, Université de

293

668 / JOURNAL OF ENVIRONMENTAL ENGINEERING / JULY 1999 BACTERIAL TRANSPORT IN GAS-SPARGED POROUS MEDIUM  

E-Print Network (OSTI)

sparging a saturated porous medium produces a mobile water interface that was hypothesized to facilitate-aquifer remediation using bioaugmentation, more efficient meth- ods are needed to widely disperse pollutant-degrading bacteria in porous media. Under water-saturated condi- tions, bacteria readily adhere to soil particles

294

Ultra-low reflection porous silicon nanowires for solar cell applications  

E-Print Network (OSTI)

Ultra-low reflection porous silicon nanowires for solar cell applications A. Najar,1, * J. Charrier aligned Porous Silicon NanoWires (PSiNWs) were fabricated on silicon substrate using metal assisted a great potential to be utilized in radial or coaxial p-n heterojunction solar cells that could provide

Paris-Sud XI, Université de

295

A new formulation of immiscible compressible two-phase flow in porous media  

E-Print Network (OSTI)

and geological barriers for a deep repository for radioactive waste, sequestration of CO2 and other applicationsA new formulation of immiscible compressible two-phase flow in porous media Brahim Amaziane is proposed to describe immiscible compressible two-phase flow in porous media. The main feature

Rogina, Mladen

296

A SHARP INTERFACE REDUCTION FOR MULTIPHASE TRANSPORT IN A POROUS FUEL CELL ELECTRODE  

E-Print Network (OSTI)

A SHARP INTERFACE REDUCTION FOR MULTIPHASE TRANSPORT IN A POROUS FUEL CELL ELECTRODE KEITH exchange membrane fuel cell is a highly porous material which acts to distribute reactant gases uniformly perturbation, fuel cell electrodes, free surface. AMS subject classifications. 35B40, 35K55, 76R99, 76S05 1

Stockie, John

297

Analysis of the heat transfer and airflow in solar chimney drying system with porous absorber  

Science Journals Connector (OSTI)

Abstract In this paper, the chimney is assembled with porous absorber for the indirect-mode solar dryer. Local thermal non-equilibrium (LTNE) exists in the porous absorber, so the double energy equations and Brinkman–Forchheimer extended Darcy model are employed to analyze the heat transfer and flow in the solar porous absorber, and the k-? turbulent model coupled with the above equations are also used to investigate the influences of the porous absorber inclination and the height of drying system on the heat transfer in the solar dryer. The specific heat capacities (?c) and thermal conductivity ks have remarkable effects on the average temperature of solar porous absorber in the drying system. The mean temperature of the higher (?c) Aluminous solar absorber is lower and the top temperature of porous absorber delays due to lower thermal conductivity ks. The inclined angle of porous absorber influences the airflow and temperature field in the solar dryer greatly. With the height of solar dryer changing from 1.41 m to 1.81 m, the higher airflow velocity and the lower temperature at chimney exit can be achieved. The simulations agree with the published experimental data. All these results should be taken into account for the promotion and application of the solar chimney dryer with porous absorber.

Wei Chen; Man Qu

2014-01-01T23:59:59.000Z

298

EIS Studies of Porous Oxygen Electrodes with Discrete II. Transmission Line Modeling  

E-Print Network (OSTI)

EIS Studies of Porous Oxygen Electrodes with Discrete Particles II. Transmission Line Modeling Chad conclusions. We describe a new model based on an array of parallel, nonuniform transmission lines to be the first porous electrode transmission line model that incorporates such physically realistic features

299

Mathematical model and simulation of gas ow through a porous medium in high breaking capacity  

E-Print Network (OSTI)

Mathematical model and simulation of gas #29;ow through a porous medium in high breaking capacity, France. Abstract. A one-dimensional model is introduced to describe the gas #29;ow and the heat transfer model coupled with a porous medium model taking into account the mechanical interaction gas-silica sand

Sart, Remi

300

RPM-2: A recyclable porous material with unusual adsorption capability: self assembly via structural transformations  

E-Print Network (OSTI)

-assembly of molecular electronics and smart materials will bring a new era in the field of material science.1 HoweverRPM-2: A recyclable porous material with unusual adsorption capability: self assembly via, fully recyclable porous material (RPM-2) with a very high sorption capability. Self

Li, Jing

Note: This page contains sample records for the topic "hard porous product" 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

Vacancy-stabilized crystalline order in hard cubes  

E-Print Network (OSTI)

We examine the effect of vacancies on the phase behavior and structure of systems consisting of hard cubes using event-driven molecular dynamics and Monte Carlo simulations. We find a first-order phase transition between a fluid and a simple cubic crystal phase that is stabilized by a surprisingly large number of vacancies, reaching a net vacancy concentration of ~6.4% near bulk coexistence. Remarkably, we find that vacancies increase the positional order in the system. Finally, we show that the vacancies are delocalized and therefore hard to detect.

Frank Smallenburg; Laura Filion; Matthieu Marechal; Marjolein Dijkstra

2012-09-16T23:59:59.000Z

302

Stabilization of Photoluminescence of Porous Silicon with Nonaqueous Anodic Oxidation  

Science Journals Connector (OSTI)

In order to prevent the reduction of photoluminescence from porous silicon, we tried to form stable Si–O bonds by anodization in nonaqueous electrolyte at room temperature. Extremely strong, stable, and blue-shifted photoluminescence was obtained in porous silicon that was prepared in 1:1 solution of 49% HF and EtOH and subsequently anodized in KNO3-ethylene glycol electrolytes. The optimum condition was anodization at 20 mA cm-2 for 5 min in 0.02 M KNO3-ethylene glycol. For the formation of Si–O bonds on nanostructured surfaces, it is suggested that the electric field across the surface/electrolyte plays an important role because oxidation becomes more effective when the electrolyte is more resistive. Si–OH, which is formed as a precursor at subsequent anodization, stabilizes the nanostructured surface, converting itself to more stable Si–O bond with photoexcitation. The high current density introduced destroys nanostructured silicon by clustering with surrounding SiO2. With this clustering, wall sizes of the nanostructured silicon remain constant with anodization.

Michiko Shimura; Minoru Katsuma; Tsugunori Okumura

1996-01-01T23:59:59.000Z

303

Monodisperse porous polymer particles containing macrocyclic ether as a new class of sorbent for SR(II) separation  

SciTech Connect

Strontium{sup 90} is one of the typical fission products that may be found in high level liquid waste (HLLW). Separation of Sr{sup 90} prior to the vitrification is beneficial to the final treatment of solid radioactive waste. In this study, a new class of sorbent for Sr(II) was developed by loading the macrocyclic ether DtBuCH18C6 into the monodisperse porous polymer particles (MPPPs). The MPPPs are well-known as a promising chromatographic material due to the uniform particle size, porous morphology, good compatibility with organic extractants, and rigid matrix. The structure and micro-morphology of the sorbent particles were characterized. The adsorption behavior towards Sr(II) in HNO{sub 3} media was investigated by both batch and column experiments. High adsorption efficiency and selective separation of Sr(II) was obtained. The sorbent particles can be recycled for at least several times before obvious lose of the adsorption ability. This kind of sorbent possesses the potential to be used for strontium separation in radioactive liquid waste.

Leng, Yuxiao; Bai, Feifei [Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084 (China); Faculty of Chemical Science and Engineering, China University of Petroleum, Beijing 100084 (China); Ye, Gang; Wei, Jichao; Wang, Jianchen; Chen, Jing [Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084 (China)

2013-07-01T23:59:59.000Z

304

Characterizing the acoustic noise generated by hard disk drives and a scheme for detecting noisy hard drives  

E-Print Network (OSTI)

of the requirements for the degree of MASTER OF SCIENCE August 1992 Major Subject: Electrical Engineering s nah7 CHARACTERIZING THE ACOUSTIC NOISE GENERATED BY HARD DISK DRIVES AND A SCHEME FOR DETECTING NOISY HARD DRIVES A Thesis by SEUK BO KIM Approved... 48 48 49 52 53 55 APPENDIX A 58 VITA LIST OF TABLES TABLE Page I Disk Drive Sample Set 16 II Subjective Human Response: Original Noise 22 IH Leq Measured by MIC1 IV Leq Measured by ACC V Leq Grouping of Tv o Sensors 24 26 26 VI...

Kim, Seuk Bo

1992-01-01T23:59:59.000Z

305

Flash Memory Garbage Collection in Hard Real-Time Systems  

E-Print Network (OSTI)

-date behavior and time consuming garbage collection mechanism, NAND-based flash memory is difficult to integrate into hard-real-time embedded systems. In this thesis, I propose a performance model for flash memory garbage collection that can be used...

Lai, Chien-An

2012-10-19T23:59:59.000Z

306

The SIMBOL-X hard X-ray mission  

Science Journals Connector (OSTI)

SIMBOL-X is a hard X-ray mission ... jointly carried out by CNES and ASI. SIMBOL-X makes uses of a long (in ... non focusing techniques used so far. The SIMBOL-X revolutionary instrumental capabilities will allow...

Giovanni Pareschi; Philippe Ferrando

2005-12-01T23:59:59.000Z

307

The SIMBOL-X hard X-ray mission  

Science Journals Connector (OSTI)

SIMBOL-X is a hard X-ray mission ... jointly carried out by CNES and ASI. SIMBOL-X makes uses of a long (in ... non focusing techniques used so far. The SIMBOL-X revolutionary instrumental capabilities will allow...

Giovanni Pareschi; Philippe Ferrando

2006-01-01T23:59:59.000Z

308

Component mixers and a hardness result for counterfeiting quantum money  

E-Print Network (OSTI)

In this paper we give the first proof that, under reasonable assumptions, a problem related to counterfeiting quantum money from knots [Farhi et al. 2010] is hard. Along the way, we introduce the concept of a component mixer, define three new classical query problems and associated complexity classes related to graph isomorphism and group membership, and conjecture an oracle separating QCMA from QMA.

Andrew Lutomirski

2011-07-01T23:59:59.000Z

309

Gravitational collapse and thermalization in the hard wall model  

E-Print Network (OSTI)

We study a simple example of holographic thermalization in a confining field theory: the homogeneous injection of energy in the hard wall model. Working in an amplitude expansion, we find black brane formation for sufficiently fast energy injection and a scattering wave solution for sufficiently slow injection. We comment on our expectations for more sophisticated holographic QCD models.

Ben Craps; Elias Kiritsis; Christopher Rosen; Anastasios Taliotis; Joris Vanhoof; Hongbao Zhang

2014-03-03T23:59:59.000Z

310

A NEW MODEL FOR PERFORMANCE PREDICTION OF HARD ROCK TBMS.  

E-Print Network (OSTI)

methods to accu- rately predict the penetration rate of a TBM in a given geology. These models are mainly, and the penetration rate. A good example of this is the Norwegian (NTH) hard rock diagnostic system and predictor penetration rate. This group of models 1.ResearchAssociakandGraduacStudentinMiningErrg.Dept. 2.Directorof

311

Dynamics simulation of MEMS device embedded hard disk drive systems  

Science Journals Connector (OSTI)

Currently, hard disk drives (HDD) use rotating disks to store digital data and magnetic recording heads are flying on the disk to read/write data. The recording heads are mounted on a slider–suspension assembly, which makes heads move from one ...

J. P. Yang; J. Chai; Y. Lu

2004-01-01T23:59:59.000Z

312

Direct Imaging of Soft-Hard Interfaces Enabled by Graphene  

E-Print Network (OSTI)

Direct Imaging of Soft-Hard Interfaces Enabled by Graphene Zonghoon Lee,*, Ki-Joon Jeon,*, Albert. We show that graphene, a single atomic layer of sp2 -bonded carbon atoms, can be employed capability. Our findings reveal the unique potential of graphene as an ideal support film for atomic

Frenklach, Michael

313

Using Genetic Algorithms for Solving Hard Problems in GIS  

E-Print Network (OSTI)

Using Genetic Algorithms for Solving Hard Problems in GIS Steven van Dijk Dirk Thierens Mark de in Geographical Information Systems (GIS's). The framework is especially suited for geographical problems since as well. 1 Introduction Geographic Information Systems (GIS's for short) combine a geographical database

Utrecht, Universiteit

314

SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD  

E-Print Network (OSTI)

SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD DISK DRIVES Tsung-Lin Chen of a prototype MEMS microactuator and vibration sensors, and controller design for suspension vibration. An LQG method is proposed for vibration sensor location and orientation optimization. Strain sensors

Horowitz, Roberto

315

Designing Proxies for Stock Market Indices is Computationally Hard  

E-Print Network (OSTI)

market index) with four commonly-used indices give NP-complete problems, so are computationally hard be multiplied by arbitrary constants to arrive at desired starting index values at time 0. · The price-weighted index of B at time t is 1(B, t) = b i=1 Si,t b . (1) The Dow Jones Industrial Average is calculated

Tate, Steve

316

High-resolution numerical methods for compressible multi-phase flow in hierarchical porous media. Progress report, September 1993--September 1994  

SciTech Connect

This is the second year in the proposed three-year effort to develop high-resolution numerical methods for multi-phase flow in hierarchical porous media. The issues being addressed in this research are: Computational efficiency: Field-scale simulation of enhanced oil recovery, whether for energy production or aquifer remediation, is typically highly under-resolved. This is because rock transport properties vary on many scales, and because current numerical methods have low resolution. Effective media properties: Since porous media are formed through complex geologic processes, they involve significant uncertainty and scale-dependence. Given this uncertainty, knowledge of ensemble averages of flow in porous media can be preferable to knowledge of flow in specific realizations of the reservoir. However, current models of effective properties do not represent the observed behavior very well. Relative permeability models present a good example of this problem. In practice, these models seldom provide realistic representations of hysteresis, interfacial tension effects or three-phase flow; there are no models that represent well all three effects simultaneously.

Trangenstein, J.A.

1994-03-15T23:59:59.000Z

317

DEVELOPMENT OF CONTINUOUS SOLVENT EXTRACTION PROCESSES FOR COAL DERIVED CARBON PRODUCTS  

SciTech Connect

The purpose of this DOE-funded effort is to develop continuous processes for solvent extraction of coal for the production of carbon products. These carbon products include materials used in metals smelting, especially in the aluminum and steel industries, as well as porous carbon structural material referred to as ''carbon foam'' and carbon fibers. During this reporting period, efforts have focused on the development of continuous processes for hydrogenation as well as continuous production of carbon foam and coke.

Elliot B. Kennel; Stephen P. Carpenter; Dady Dadyburjor; Manoj Katakdaunde; Liviu Magean; Peter G. Stansberry; Alfred H. Stiller; John W. Zondlo

2005-06-08T23:59:59.000Z

318

DEVELOPMENT OF CONTINUOUS SOLVENT EXTRACTION PROCESSES FOR COAL DERIVED CARBON PRODUCTS  

SciTech Connect

The purpose of this DOE-funded effort is to develop continuous processes for solvent extraction of coal for the production of carbon products. These carbon products include materials used in metals smelting, especially in the aluminum and steel industries, as well as porous carbon structural material referred to as ''carbon foam'' and carbon fibers. During this reporting period, efforts have focused on the development of continuous processes for hydrogenation as well as continuous production of carbon foam and coke.

Elliot B. Kennel; Stephen P. Carpenter; Dady Dadyburjor; Manoj Katakdaunde; Liviu Magean; Madhavi Nallani-Chakravartula; Peter G. Stansberry; Alfred H. Stiller; John W. Zondlo

2006-03-27T23:59:59.000Z

319

Application of atmospheric-pressure non-thermal plasma to chlorination of hardly soluble materials  

Science Journals Connector (OSTI)

Abstract The chlorination reaction in which hardly soluble materials are chemically converted into soluble chlorides by atmospheric-pressure non-thermal plasma (APNTP) and the effect of the plasma-irradiation conditions on the chlorination reaction were investigated. The CeO2 specimens, which have the same crystallographic structure (CaF2 type, cubic) and valence fluctuation behavior as ThO2, were used to simulate hardly soluble nuclear materials. \\{CCl4\\} and He mixed gas were used as the plasma discharge. The emission and electrical properties of APNTP and dissolution behaviors of chloride generated by plasma irradiation were evaluated. The results of the emission spectroscopic analysis and electrical property measurements showed that chlorine and carbon were generated from the decomposition of \\{CCl4\\} caused by the excited atmospheric components and He. Moreover, the production of CeCl3 from CeO2 and a logarithmic progression of the chlorination reaction were indicated with increasing plasma-irradiation time.

Toru Kitagaki; Tatsuya Suzuki; Toshitaka Kaneshiki; Masao Nomura

2014-01-01T23:59:59.000Z

320

Method and apparatus for determining distribution of fluids in a porous sample  

SciTech Connect

Apparatus for use in expelling fluid from a porous sample is described. It consists of: a chamber adapted to receive a porous sample having an arcuate outer extremity the curvature of which substantially corresponds to the arc of a circle; means connecting the chamber to a rotatable shaft mounted substantially on the center of curvature of the arcuate outer extremity of the chamber; means for rotating the shaft, whereby the spinning of a fluid-saturated porous sample contained in the chamber will expel fluid from the sample; and means for capturing fluid expelled from the sample.

Christiansen, R.L.

1989-04-04T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

Scaling the Water Percolation in PEM Fuel Cell Porous Transport Layers  

Science Journals Connector (OSTI)

A typical polymer electrolyte membrane fuel cell (PEMFC) consist of a series of non?wetting porous layers comprised between the bipolar plates: the porous transport anode and cathode layers with their catalyst layer and the proton exchange membrane. The cathode porous transport layer (PTL) also known as gas diffusion layer has the dual role of facilitating the access of the reactants to the catalyst layer while removing the generated water. Water percolation through the PTL will evolve on one of the drainage flow patterns (either capillary fingering or stable displacement) depending on the injection flow rate.

E. F. Medici; J. S. Allen

2010-01-01T23:59:59.000Z

322

Enhancement of thermal stability of porous bodies comprised of stainless steel or an alloy  

DOE Patents (OSTI)

A method for treating a porous item constructed of metal powder, such as a powder made of Series 400 stainless steel, involves a step of preheating the porous item to a temperature of between about 700 and 900.degree. C. degrees in an oxidizing atmosphere and then sintering the body in an inert or reducing atmosphere at a temperature which is slightly below the melting temperature of the metal which comprises the porous item. The thermal stability of the resulting item is enhanced by this method so that the item retains its porosity and metallic characteristics, such as ductility, at higher (e.g. near-melting) temperatures.

Bischoff, Brian L. (Knoxville, TN); Sutton, Theodore G. (Kingston, TN); Judkins, Roddie R. (Knoxville, TN); Armstrong, Timothy R. (Clinton, TN); Adcock, Kenneth D. (Harriman, TN)

2010-11-09T23:59:59.000Z

323

Heterogeneous perturbation of fluid density and solid elastic strain in consolidating porous media  

E-Print Network (OSTI)

The occurrence of heterogeneous perturbations of fluid mass density and solid elastic strain of a porous continuum, as a consequence of its undrained response is a very important topic in theoretical and applied poromechanics. The classical Mandel--Cryer effect provides an explanation of fluid overpressure in the central region of a porous sample, immediately after the application of the loading. However this effect fades away when the fluid leaks out of the porous network. Here this problem is studied within the framework of a second gradient theory and a thorough description of the static and the dynamics of the phenomenon is given.

P. Artale Harris; E. N. M. Cirillo; G. Sciarra

2014-07-20T23:59:59.000Z

324

Heterogeneous electrocatalysis in porous cathodes of solid oxide fuel cells  

E-Print Network (OSTI)

A general physics-based model is developed for heterogeneous electrocatalysis in porous electrodes and used to predict and interpret the impedance of solid oxide fuel cells. This model describes the coupled processes of oxygen gas dissociative adsorption and surface diffusion of the oxygen intermediate to the triple phase boundary, where charge transfer occurs. The model accurately captures the Gerischer-like frequency dependence and the oxygen partial pressure dependence of the impedance of symmetric cathode cells. Digital image analysis of the microstructure of the cathode functional layer in four different cells directly confirms the predicted connection between geometrical properties and the impedance response. As in classical catalysis, the electrocatalytic activity is controlled by an effective Thiele modulus, which is the ratio of the surface diffusion length (mean distance from an adsorption site to the triple phase boundary) to the surface boundary layer length (square root of surface diffusivity div...

Fu, Y; Bertei, A; Qi, C; Mohanram, A; Pietras, J D; Bazant, M Z

2014-01-01T23:59:59.000Z

325

Strength and stability of microbial plugs in porous media  

SciTech Connect

Mobility reduction induced by the growth and metabolism of bacteria in high-permeability layers of heterogeneous reservoirs is an economically attractive technique to improve sweep efficiency. This paper describes an experimental study conducted in sandpacks using an injected bacterium to investigate the strength and stability of microbial plugs in porous media. Successful convective transport of bacteria is important for achieving sufficient initial bacteria distribution. The chemotactic and diffusive fluxes are probably not significant even under static conditions. Mobility reduction depends upon the initial cell concentrations and increase in cell mass. For single or multiple static or dynamic growth techniques, permeability reduction was approximately 70% of the original permeability. The stability of these microbial plugs to increases in pressure gradient and changes in cell physiology in a nutrient-depleted environment needs to be improved.

Sarkar, A.K. [NIPER/BDM-Oklahoma, Inc., Bartlesville, OK (United States); Sharma, M.M.; Georgiou, G. [Univ. of Texas, Austin, TX (United States)

1995-12-31T23:59:59.000Z

326

Fuel cell with interdigitated porous flow-field  

DOE Patents (OSTI)

A polymer electrolyte membrane (PEM) fuel cell is formed with an improved system for distributing gaseous reactants to the membrane surface. A PEM fuel cell has an ionic transport membrane with opposed catalytic surfaces formed thereon and separates gaseous reactants that undergo reactions at the catalytic surfaces of the membrane. The fuel cell may also include a thin gas diffusion layer having first and second sides with a first side contacting at least one of the catalytic surfaces. A macroporous flow-field with interdigitated inlet and outlet reactant channels contacts the second side of the thin gas diffusion layer for distributing one of the gaseous reactants over the thin gas diffusion layer for transport to an adjacent one of the catalytic surfaces of the membrane. The porous flow field may be formed from a hydrophilic material and provides uniform support across the backside of the electrode assembly to facilitate the use of thin backing layers. 9 figs.

Wilson, M.S.

1997-06-24T23:59:59.000Z

327

Fuel cell with interdigitated porous flow-field  

DOE Patents (OSTI)

A polymer electrolyte membrane (PEM) fuel cell is formed with an improved system for distributing gaseous reactants to the membrane surface. A PEM fuel cell has an ionic transport membrane with opposed catalytic surfaces formed thereon and separates gaseous reactants that undergo reactions at the catalytic surfaces of the membrane. The fuel cell may also include a thin gas diffusion layer having first and second sides with a first side contacting at least one of the catalytic surfaces. A macroporous flow-field with interdigitated inlet and outlet reactant channels contacts the second side of the thin gas diffusion layer for distributing one of the gaseous reactants over the thin gas diffusion layer for transport to an adjacent one of the catalytic surfaces of the membrane. The porous flow field may be formed from a hydrophilic material and provides uniform support across the backside of the electrode assembly to facilitate the use of thin backing layers.

Wilson, Mahlon S. (Los Alamos, NM)

1997-01-01T23:59:59.000Z

328

Method for forming porous sintered bodies with controlled pore structure  

DOE Patents (OSTI)

The present invention is based, in part, on a method for combining a mixture of hydroxide and hydride functional siloxanes to form a polysiloxane polymer foam, that leaves no residue (zero char yield) upon thermal decomposition, with ceramic and/or metal powders and appropriate catalysts to produce porous foam structures having compositions, densities, porosities and structures not previously attainable. The siloxanes are mixed with the ceramic and/or metal powder, wherein the powder has a particle size of about 400 .mu.m or less, a catalyst is added causing the siloxanes to foam and crosslink, thereby forming a polysiloxane polymer foam having the metal or ceramic powder dispersed therein. The polymer foam is heated to thermally decompose the polymer foam and sinter the powder particles together. Because the system is completely nonaqueous, this method further provides for incorporating reactive metals such as magnesium and aluminum, which can be further processed, into the foam structure.

Whinnery, LeRoy Louis (4929 Julie St., Livermore, Alameda County, CA 94550); Nichols, Monte Carl (4070 Guilford Ave., Livermore, Alameda County, CA 94550)

2000-01-01T23:59:59.000Z

329

Supercritical carbon dioxide behavior in porous silica aerogel  

SciTech Connect

Analysis of the tails of the small-angle neutron scattering (SANS) intensities relevant to samples formed by porous silica and carbon dioxide at pressures ranging from 0 to 20 MPa and at temperatures of 308 and 353 K confirms that the CO2 fluid must be treated as a two-phase system. The first of these phases is formed by the fluid closer to the silica wall than a suitable distance [delta] and the second by the fluid external to this shell. The sample scattering-length densities and shell thicknesses are determined by the Porod invariants and the oscillations observed in the Porod plots of the SANS intensities. The resulting matter densities of the shell regions (thickness 15-35 {angstrom}) are approximately equal, while those of the outer regions increase with pressure and become equal to the bulk CO2 at the higher pressures only in the low-temperature case.

Ciccariello, Salvino [Universita di Padova; Melnichenko, Yuri B [ORNL; He, Lilin [ORNL

2011-01-01T23:59:59.000Z

330

Improving Hardness and Toughness of Boride Composites Based on AIMgB14  

SciTech Connect

The search for new super-hard materials has usually focused on strongly bonded, highly symmetric crystal structures similar to diamond. The two hardest single-phase materials, diamond and cubic boron nitride (cBN), are metastable, and both must be produced at high temperatures and pressures, which makes their production costly. In 2000, a superhard composite based on a low-symmetry, boron-rich compound was reported. Since then, many advances have been made in the study of this AlMgB{sub 14}-TiB{sub 2} composite. The composite has been shown to exhibit hardness greater than either of its constituent phases, relying on its sub-micron microstructure to provide hardening and strengthening mechanisms. With possible hardness around 40 GPa, an AlMgB{sub 14} - 60 vol% TiB{sub 2} approaches the hardness of cBN, yet is amenable to processing under ambient pressure conditions. There are interesting aspects of both the AlMgB{sub 14} and TiB{sub 2} phases. AlMgB{sub 14} is comprised of a framework of boron, mostly in icosahedral arrangements. It is part of a family of 12 known compounds with the same boron lattice, with the metal atoms replaced by Li, Na, Y or a number of Lanthanides. Another peculiar trait of this family of compounds is that every one contains a certain amount of intrinsic vacancies on one or both of the metal sites. These vacancies are significant, ranging from 3 to 43% of sites depending on the composition. TiB{sub 2} is a popular specialty ceramic material due to its high hardness, moderate toughness, good corrosion resistance, and high thermal and electrical conductivity. The major drawback is the difficulty of densification of pure TiB2 ceramics. A combination of sintering aids, pressure, and temperatures of 1800 C are often required to achieve near full density articles. The AlMgB{sub 14} - TiB{sub 2} composites can achieve 99% density from hot-pressing at 1400 C. This is mostly due to the preparation of powders by a high-energy milling technique known as mechanical alloying. The resulting fine powders have high activity, and Fe from wear debris acts as a sintering aid. Mechanical alloying improves the sinterability of the composite material, it has the same effect on pure TiB{sub 2}. TiB{sub 2} processed by high-energy milling has been found to achieve 99% theoretical density at 1400 C with the addition of {approx}1 wt% Fe. Both the AlMgB{sub 14} - TiB{sub 2} composites and pure TiB{sub 2} produced from these methods have enhanced mechanical properties due to their fine microstructures. These materials show exceptional promise in the field of wear resistance. This includes cutting tools, erosion resistant coatings, and low-friction sliding contacts to name a few. Under certain wear conditions, the composite material can show performance on par with that of current high-end cBN and WC materials tailored for wear resistance. The composite material also exhibits low reactivity with Ti alloys, a pre-requisite for effective machining of these alloys, a trait that few hard materials possess.

Justin Steven Peters

2007-12-01T23:59:59.000Z

331

Does The 3N-Force Have A Hard Core?  

E-Print Network (OSTI)

The meson-nucleon dynamics that generates the hard core of the RuhrPot two-nucleon interaction is shown to vanish in the irreducible 3N force. This result indicates a small 3N force dominated by conventional light meson-exchange dynamics and holds for an arbitrary meson-theoretic Lagrangian. The resulting RuhrPot 3N force is defined in the appendix. A completely different result is expected when the Tamm-Dancoff/Bloch-Horowitz procedure is used to define the NN and 3N potentials. In that approach, (e.g. full Bonn potential) both the NN {\\it and} 3N potentials contain non-vanishing contributions from the coherent sum of meson-recoil dynamics and the possibility of a large hard core requiring explicit calculation cannot be ruled out.

J. A. Eden; M. F. Gari

1996-01-17T23:59:59.000Z

332

Hard Excluseive $?$ and $J/?$ Photoproduction off a Proton  

E-Print Network (OSTI)

We study the photoproduction of the vector mesons $\\Phi$ and $J/\\Psi$ off a proton in the kinematical regime of large energies and scattering angles within the framework of perturbative QCD. Our investigations are based on the hard scattering approach. This means that the hadrons are replaced by their valence Fock states and scattering on the partonic level is described by tree graphs in which the large transferred momentum is redistributed between the valence partons via the exchange of hard gluons. We find that the unpolarized photoproduction cross sections are dominated by Compton-scattering-like graphs in which the photon couples to the proton, whereas vector-meson-dominance-like graphs, in which the photon fluctuates into the heavy quark-antiquark pair which then exchanges two gluons with the proton, play a minor role. We give explicit predictions for unpolarized scattering cross sections and compare them with experimental data where possible.

A. T. Goritschnig; B. Melic; K. Passek-Kumericki; W. Schweiger

2014-11-04T23:59:59.000Z

333

Probing the evolution and morphology of hard carbon spheres  

SciTech Connect

Monodispersed hard carbon spheres can be synthesized quickly and reproducibly by autogenic reactions of hydrocarbon precursors, notably polyethylene (including plastic waste), at high temperature and pressure. The carbon microparticles formed by this reaction have a unique spherical architecture, with a dominant internal nanometer layered motif, and they exhibit diamond-like hardness and electrochemical properties similar to graphite. In the present study, in-situ monitoring by X-ray diffraction along with electron microscopy, Raman spectroscopy, neutron pair-distribution function analysis, and computational modeling has been used to elucidate the morphology and evolution of the carbon spheres that form from the autogenic reaction of polyethylene at high temperature and pressure. A mechanism is proposed on how polyethylene evolves from a linear chain-based material to a layered carbon motif. Heating the spheres to 2400-2800 °C under inert conditions increases their graphitic character, particularly at the surface, which enhances their electrochemical and tribological properties.

Pol, Vilas G.; Wen, Jianguo; Lau, Kah Chun; Callear, Samantha; Bowron, Daniel T.; Lin, Chi-Kai; Deshmukh, Sanket A.; Sankaranarayanan, Subramanian; Curtiss, Larry A.; David, William; Miller, Dean J.; Thackeray, Michael M.

2014-03-01T23:59:59.000Z

334

Multiple reentrant glass transitions in confined hard-sphere glasses  

E-Print Network (OSTI)

Glass forming liquids exhibit a rich phenomenology upon confinement. This is often related to the effects arising from wall-fluid interactions. Here we focus on the interesting limit where the separation of the confining walls becomes of the order of a few particle diameters. For a moderately polydisperse, densely packed hard-sphere fluid confined between two smooth hard walls, we show via event-driven molecular dynamics simulations the emergence of a multiple reentrant glass transition scenario upon a variation of the wall separation. Using thermodynamic relations, this reentrant phenomenon is shown to persist also under constant chemical potential. This allows straightforward experimental investigation and opens the way to a variety of applications in micro- and nanotechnology, where channel dimensions are comparable to the size of the contained particles. The results are in-line with theoretical predictions obtained by a combination of density functional theory and the mode-coupling theory of the glass transition.

S. Mandal; S. Lang; M. Gross; M. Oettel; D. Raabe; T. Franosch; F. Varnik

2014-06-20T23:59:59.000Z

335

Foamy Oil Flow and its Role in Heavy Oil Production  

Science Journals Connector (OSTI)

Two?phase oil?gas flow in porous media is often encountered during oil production from oil bearing sedimentary rocks. Traditionally such flow is modeled by extending the Darcy’s law to two?phase flow by employing the concept of saturation dependent relative permeability. This model is remarkably successful as long as the fluid distribution within the porous medium is controlled by capillary forces. Under this condition the two fluids appear to flow in their own continuous flow channels. This flow description is applicable to most reservoir flow scenarios encountered in light oil production. However in primary production of heavy oil under solution?gas drive this flow model often fails to provide a satisfactory match of the observed behaviour.

Brij B. Maini; Bashir Busahmin

2010-01-01T23:59:59.000Z

336

4 : Hardware In this lecture consider Hard A Life  

E-Print Network (OSTI)

4 : Hardware In this lecture consider Hard A Life Includes some `real robots' and simulated ones We ... Learning Classifier Systems p1 RJM 30/01/13 SE4SI12 Artificial Life ­ Part B © Dr Richard Mitchell 2013 #12;Robotics in Cybernetics p2 RJM 30/01/13 SE4SI12 Artificial Life ­ Part B © Dr Richard Mitchell 2013

Mitchell, Richard

337

February 24, 2009 Radiation-Hardness of VCSEL/PIN  

E-Print Network (OSTI)

Upgrade Week 6 Radiation-Hardness of GaAs PIN Preliminary Optowell AOC ULM significant decrease @ SLHC Gb/s Responsivity (A/W) GaAs Pre Post ULM 4.25 0.50 0.04 AOC 5.0 0.60 0.04 Optowell 3.125 0.60 0 8 850 nm VCSEL Power vs Dosage Very slow annealing of optical power AOC 5G has good power

Gan, K. K.

338

Diffuse scattering of hard x rays from rough surfaces  

Science Journals Connector (OSTI)

The diffuse scattering of hard x rays from rough solid surfaces has been measured and described quantitatively in terms of an improved distorted-wave Born approximation. The rough surface is characterized by the rms roughness ?, the height-height correlation length ?, and the roughness exponent h. The value for ? is in excellent agreement with that deduced from reflectivity. The significance of the parameters ?, ?, and h is tested by comparison with the results obtained from scanning force mircoscopy.

Wolfgang Weber and Bruno Lengeler

1992-09-15T23:59:59.000Z

339

Chapter 9 - Recognition is Easy; Recall is Hard  

Science Journals Connector (OSTI)

Abstract This chapter describes important differences between recognition and recall, mainly that recognition is easy for the human brain and recall is hard. It describes how recognition and recall work in the brain. Patterns of neural activity, which is what memories are, can be activated in two different ways: by more perceptions coming in from the senses and by other brain activity. The former is recognition; the latter is recall. It then discusses the resulting guidelines for user-interface design, with examples.

Jeff Johnson

2014-01-01T23:59:59.000Z

340

Nano-scale positioning, control and motion planning in hard disk drives  

E-Print Network (OSTI)

Dynamic flying height adjustment in hard disk drives throughprocessing for flying height control in hard disk drives . .for sub-3- nm flying height head-disk systems. Journal of

Boettcher, Uwe

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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

Science Bowl 2012: A Long, Hard-Fought Battle for First | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Science Bowl 2012: A Long, Hard-Fought Battle for First Science Bowl 2012: A Long, Hard-Fought Battle for First May 1, 2012 - 5:53pm Addthis Zaroug Jafeel, Mathew Arbesfeld, Julia...

342

Density functional theory for Baxter's sticky hard spheres in confinement  

E-Print Network (OSTI)

It has recently been shown that a free energy for Baxter's sticky hard sphere fluid is uniquely defined within the framework of fundamental measure theory (FMT) for the inhomogeneous hard sphere fluid, provided that it obeys scaled-particle theory and the Percus-Yevick (PY) result for the direct correlation function [Hansen-Goos and Wettlaufer, J. Chem. Phys. {\\bf 134}, 014506 (2011)]. Here, combining weighted densities from common versions of FMT with a new vectorial weighted density, we derive a regularization of the divergences of the associated strongly confined limit. Moreover, the simple free energy that emerges is exact in the zero-dimensional limit, leaves the underlying equation of state unaffected, and yields a direct correlation function distinct from the PY expression. Comparison with simulation data for both the bulk pair correlation function and the density profiles in confinement shows that the new theory is significantly more accurate than the PY-based results. Finally, the resulting free energy is applicable to a glass of adhesive hard spheres.

Hendrik Hansen-Goos; Mark A. Miller; J. S. Wettlaufer

2011-12-15T23:59:59.000Z

343

Hard Rescattering Mechanism in High Energy Photodisintegration of the Light Nuclei  

E-Print Network (OSTI)

We discuss the high energy photodisintegrataion of light nuclei in which the energy of the absorbed photon is equally shared between two nucleons in the target. For these reactions we investigate the model in which photon absorption by a quark in one nucleon followed by its high momentum transfer interaction with a quark of the other nucleon leads to the production of two nucleons with high relative momentum. We sum the relevant quark rescattering diagrams, and demonstrate that the scattering amplitude can be expressed as a convolution of the large angle NN scattering amplitude, the hard photon-quark interaction vertex and the low-momentum nuclear wave function. Within this model we calculate the cross sections and polarization observables of high energy gamma + d --> pn and gamma + ^3He --> pp + n reactions.

Misak M. Sargsian

2002-08-15T23:59:59.000Z

344

The Hardness of Cottonseed Cake as Related to its Suitability for Feeding.  

E-Print Network (OSTI)

TEXAS AGRICULTURAL EXPERIMENT STA1'1ON A. B. CONNER, DIRECTOR COLLEGE STATION, BICAZOS COUNTY, TEXAS BULLETIN NO. 523 MARCH, 1936 DIVISION OF CHEMISTRY The Hardness of Cottonseed Cake as Related to its Suitabilit: for Feeding... Relation of hardness to consumption of cottonseed cake by sheep_- 23 classification of cottonseed cake with respect to hardness _----------_-_-__-- 25 Acknowledgment 2 7 Summary 27 BULLETIN NO. 523 MARCH, 1936 THE HARDNESS OF COTTONSEED CAKE AS RELATED...

Fraps, G. S. (George Stronach); Marrs, C. D. (Cecil Douglas)

1936-01-01T23:59:59.000Z

345

The effect of food hardness on feeding behaviour in frugivorous bats (Phyllostomidae): an experimental study  

E-Print Network (OSTI)

, and Kruskal±Wallis tests demonstrate that feeding behaviours vary signi®cantly with fruit hardness both within

Dumont, Elizabeth R.

346

HEAVY AND THERMAL OIL RECOVERY PRODUCTION MECHANISMS  

SciTech Connect

This technical progress report describes work performed from April 1 through June 30, 2002, for the project ''Heavy and Thermal Oil Recovery Production Mechanisms.'' We investigate a broad spectrum of topics related to thermal and heavy-oil recovery. Significant results were obtained in the areas of multiphase flow and rock properties, hot-fluid injection, improved primary heavy oil recovery, and reservoir definition. The research tools and techniques used are varied and span from pore-level imaging of multiphase fluid flow to definition of reservoir-scale features through streamline-based history-matching techniques. Briefly, experiments were conducted to image at the pore level matrix-to-fracture production of oil from a fractured porous medium. This project is ongoing. A simulation studied was completed in the area of recovery processes during steam injection into fractured porous media. We continued to study experimentally heavy-oil production mechanisms from relatively low permeability rocks under conditions of high pressure and high temperature. High temperature significantly increased oil recovery rate and decreased residual oil saturation. Also in the area of imaging production processes in laboratory-scale cores, we use CT to study the process of gas-phase formation during solution gas drive in viscous oils. Results from recent experiments are reported here. Finally, a project was completed that uses the producing water-oil ratio to define reservoir heterogeneity and integrate production history into a reservoir model using streamline properties.

Anthony R. Kovscek

2002-07-01T23:59:59.000Z

347

Carbon Dioxide Capture from Air Using Amine-Grafted Porous Polymer...  

NLE Websites -- All DOE Office Websites (Extended Search)

Carbon Dioxide Capture from Air Using Amine-Grafted Porous Polymer Networks Previous Next List Weigang Lu, Julian P. Sculley, Daqiang Yuan, Rajamani Krishna, and Hong-Cai Zhou, J....

348

Synthesis and Characterization of Rationally Designed Porous Materials for Energy Storage and Carbon Capture  

E-Print Network (OSTI)

Two of the hottest areas in porous materials research in the last decade have been in energy storage, mainly hydrogen and methane, and in carbon capture and sequestration (CCS). Although these topics are intricately linked in terms of our future...

Sculley, Julian Patrick

2013-04-30T23:59:59.000Z

349

The hydroelectric problem of porous rocks: thermodynamic approach and introduction of a percolation threshold  

Science Journals Connector (OSTI)

......research-article Research Notes The hydroelectric problem of porous rocks: thermodynamic...layer. In this note, I take the hydroelectric problem back to its thermodynamic roots by showing how the hydroelectric equations can be derived from the......

André Revil

2002-12-01T23:59:59.000Z

350

Thermosensitive gating effect and selective gas adsorption in a porous coordination nanocage  

SciTech Connect

A porous coordination nanocage functionalized with 24 triisopropylsilyl groups exhibits a remarkable thermosensitive gate opening phenomenon and demonstrates a molecular sieving effect at a certain temperature range, which can be used for gas separation purposes.

Zhao, Dan; Yuan, Daqiang; Krishna, Rajamani; van Baten, Jasper M.; Zhou, Hong-Cai (TAM); (U. Amsterdam)

2010-10-22T23:59:59.000Z

351

Thermosensitive gating effect and selective gas adsorption in a porous coordination nanocage  

SciTech Connect

A porous coordination nanocage functionalized with 24 triisopropylsilyl groups exhibits a remarkable thermosensitive gate opening phenomenon and demonstrates a molecular sieving effect at a certain temperature range, which can be used for gas separation purposes.

Zhao, Dan; Yuan, Daqiang; Krishna, Rajamani; van Baten, Jasper M; Zhou, Hong-Cai

2010-01-01T23:59:59.000Z

352

Symmetry-Guided Synthesis of Highly Porous Metal-Organic Frameworks...  

NLE Websites -- All DOE Office Websites (Extended Search)

Symmetry-Guided Synthesis of Highly Porous Metal-Organic Frameworks with Fluorite Topology Previous Next List Muwei Zhang, Ying-Pin Chen, Mathieu Bosch, Thomas Gentle III, Kecheng...

353

Fabrication and characterization of porous NiTi Shape Memory Alloy by elevated pressure sintering  

E-Print Network (OSTI)

have not been adequately developed. Currently, three methods are commonly used for producing porous NiTi SMAs from elemental powders. These methods include conventional sintering, Self-propagating High-temperature Synthesis (SHS), and sintering...

Vandygriff, Eric Layton

2012-06-07T23:59:59.000Z

354

Augmentation of Power Output of Axisymmetric Ducted Wind Turbines by Porous Trailing Edge Disks  

E-Print Network (OSTI)

This paper presents analytical and experimental results that demonstrated that the power output from a ducted wind turbine can be dramatically increased by the addition of a trailing edge device such as a porous disk. In ...

widnall, sheila

2014-06-30T23:59:59.000Z

355

Unified lattice Boltzmann method for flow in multiscale porous media Qinjun Kang  

E-Print Network (OSTI)

Unified lattice Boltzmann method for flow in multiscale porous media Qinjun Kang Los Alamos; published 21 November 2002 In this paper, we develop a unified lattice Boltzmann method for flow

Zhang, Dongxiao

356

Formation of Biomimetic Porous Calcium Phosphate Coatings on Surfaces of Polyethylene/Zinc Stearate Blends  

E-Print Network (OSTI)

Formation of Biomimetic Porous Calcium Phosphate Coatings on Surfaces of Polyethylene/Zinc Stearate phosphate coating, polyethylene Abstract Studies were undertaken investigating improvements presented in this paper concentrated on adding zinc stearate to polyethylene. Important potential benefits

Drelich, Jaroslaw W.

357

A Study of Porous Transitions of Layer-By-Layer Thin Films and Patterning Multilayers  

E-Print Network (OSTI)

multilayers. These morphological changes were able to be created by both acidic and basic post-assembly treatments, showing various morphological transitions from the introduction of porosity to the collapse of these porous structures and the eventual...

Cho, Chungyeon

2013-05-24T23:59:59.000Z

358

Microstructure and Properties of Nanostructured Calcium Phosphate/Titania Porous Coatings via Micro Arc Oxidation  

Science Journals Connector (OSTI)

Crystalline Calcium Phosphate-TiO2 nanostructured porous layers were fabricated via micro arc oxidation technique under different times to investigate how...2 inner layer during the MAO growth. Based on XRD patte...

Sakine Abbasi; Hamid Reza Rezaie…

2013-01-01T23:59:59.000Z

359

Cost-Effective Porous Silicon Technology For Solar Cell Industrial Applications  

Science Journals Connector (OSTI)

For porous silicon (PS) layer preparation, only the electrochemical method of DC- anodizing in HF-based electrolytes and the chemical method using HF/HNO3 electrolytes are widely used. In solar cell applications,...

V. Yerokhov; M. Lipinski; A. Mylyanych…

2002-01-01T23:59:59.000Z

360

QUANTITATIVE NON-DESTRUCTIVE EVALUATION (QNDE) OF THE ELASTIC MODULI OF POROUS TIAL ALLOYS  

SciTech Connect

The elastic moduli of {gamma}-TiA1 were studied in porous samples consolidated by various techniques e.g. cold isostatic pressing (CIP), pressure-less sintering, or hot isostatic pressing (HIP). Porosity linearly affects the dynamic elastic moduli of samples. The results indicate that the sound wave velocities and the elastic moduli affected by the processing route and depend not only on the attained density but also on the consolidation temperature. In this paper we show that there is linear correlation between the shear and the longitudinal sound velocities in porous TiA1. This opens the way to use a single sound velocity as a tool for quantitative non-destructive evaluation (QNDE) of porous TiA1 alloys. Here we demonstrate the applicability of an equation derived from the elastic theory and used previously for porous cubic metals.

Yeheskel, O. [NRCN, PO Box 9001, Beer Sheva, 84190 (Israel)

2008-02-28T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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.


361

X-ray and Neutron Scattering Studies of Methyl Iodide and Hydrogen Confined in Porous Media.  

E-Print Network (OSTI)

??X-ray diffraction was used to study the liquid - solid phase transition and structure of methyl iodide confined in porous GelTech© glass, with 25, 50… (more)

Glanville, Yvonne

2005-01-01T23:59:59.000Z

362

Simulation of surface waves with porous boundaries in a 2-D numerical wave tank  

E-Print Network (OSTI)

with the BEM solutions. Good agreement is observed between the two independent solutions. After verifying the numerical methods, we studied the interaction of water waves with a porous or rigid bottom-mounted half cylinder. The reflection and transmission...

Koo, Weoncheol

2012-06-07T23:59:59.000Z

363

Transport and seismoelectric properties of porous permeable rock : numerical modeling and laboratory measurements  

E-Print Network (OSTI)

The objective of this thesis is to better understand the transport and seismoelectric (SE) properties of porous permeable rock. Accurate information of rock transport properties, together with pore geometry, can aid us to ...

Zhan, Xin, Ph. D. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

364

Projectile propulsion through a porous supersonic nozzle with application to airguns  

E-Print Network (OSTI)

The purpose of this study is to show theoretically and ics. experimentally that a porous barrel can allow pneumatic airgun projectiles to reach velocities in excess of Mach 1 of the gas behind the projectile. Thermodynamic steady flow relations...

Russell, Ronnie David

1996-01-01T23:59:59.000Z

365

Imaging studies of peripheral nerve regeneration induced by porous collagen biomaterials  

E-Print Network (OSTI)

There is urgent need to develop treatments for inducing regeneration in injured organs. Porous collagen-based scaffolds have been utilized clinically to induce regeneration in skin and peripheral nerves, however still there ...

Tzeranis, Dimitrios Spyridon

2013-01-01T23:59:59.000Z

366

Utilization of CO2 as cushion gas for porous media compressed air energy storage  

E-Print Network (OSTI)

design of compressed air energy storage electric powerS and Williams RH, Compressed Air Energy Storage: Theory,Porous media compressed air energy storage (PM-CAES): theory

Oldenburg, C.M.

2014-01-01T23:59:59.000Z

367

Analytical Solutions for Multicomponent, Two-Phase Flow in Porous Media with Double Contact Discontinuities  

E-Print Network (OSTI)

This paper presents the first instance of a double contact discontinuity in analytical solutions for multicomponent, two-phase flow in porous media. We use a three-component system with constant equilibrium ratios and fixed ...

Orr, F. M. Jr

368

Instability of Hadley–Prats Flow with Viscous Heating in a Horizontal Porous Layer  

Science Journals Connector (OSTI)

The onset of convective rolls instability in a horizontal porous layer subject to a basic temperature gradient inclined with respect to gravity is investigated. The basic velocity has a linear profile with a non-...

A. Barletta; D. A. Nield

2010-09-01T23:59:59.000Z

369

Simultaneous dual-wavelength reflection digital holography applied to the study of the porous coal samples  

Science Journals Connector (OSTI)

We present a simultaneous dual-wavelength phase-imaging digital holographic technique demonstrated on porous coal samples. The use of two wavelengths enables us to increase the axial...

Khmaladze, Alexander; Restrepo-Martínez, Alejandro; Kim, Myung; Castañeda, Roman; Blandón, Astrid

2008-01-01T23:59:59.000Z

370

Flow Intermittency, Dispersion, and Correlated Continuous Time Random Walks in Porous Media  

E-Print Network (OSTI)

We study the intermittency of fluid velocities in porous media and its relation to anomalous dispersion. Lagrangian velocities measured at equidistant points along streamlines are shown to form a spatial Markov process. ...

de Anna, Pietro

371

Charge transfer kinetics at the solid–solid interface in porous electrodes  

E-Print Network (OSTI)

Interfacial charge transfer is widely assumed to obey the Butler–Volmer kinetics. For certain liquid–solid interfaces, the Marcus–Hush–Chidsey theory is more accurate and predictive, but it has not been applied to porous ...

Bai, Peng

372

A porous covalent porphyrin framework with exceptional uptake capacity of saturated hydrocarbons oil spill cleanup  

SciTech Connect

Yamamoto homo-coupling reaction of tetra(4-bromophenyl)porphyrin afforded a porous covalent porphyrin framework, PCPF-1, which features strong hydrophobicity and oleophilicity and demonstrates exceptional adsorptive capacities for saturated hydrocarbons and gasoline.

Wang, Xi-Sen; Liu, Jian; Bonefont, Jean M.; Yuan, Da-Qiang; Thallapally, Praveen K.; Ma, Shengqian

2013-01-21T23:59:59.000Z

373

Ductile Binder Phase For Use With Almgb14 And Other Hard Ceramic Materials  

DOE Patents (OSTI)

This invention relates to a ductile binder phase for use with AlMgB14 and other hard materials. The ductile binder phase, a cobalt-manganese alloy, is used in appropriate quantities to tailor good hardness and reasonable fracture toughness for hard materials so they can be used suitably in industrial machining and grinding applications.

Cook, Bruce A. (Ankeny, IA); Russell, Alan (Ames, IA); Harringa, Joel (Ames, IA)

2005-07-26T23:59:59.000Z

374

Quarkonium Production in PHENIX  

E-Print Network (OSTI)

Quarkonia provide a sensitive probe of the properties of the hot dense medium created in high energy heavy ion collisions. Hard scattering processes result in the production of heavy quark pairs that interact with the collision medium during hadronization. These in medium interactions convey information about the fundamental properties of the medium itself and can be used to examine the modification of the QCD confining potential in the collision environment. Baseline measurements from the d+Au and p+p collision systems can be used to distinguish cold nuclear matter effects while measurements from heavy ion collision systems, Au+Au and Cu+Cu, can be used to quantify in-medium effects. PHENIX results for the production of the $J/\\psi$ for a diverse set of collision systems and energies and for the $\\Upsilon$ in p+p collisions are presented.

Abigail Bickley; for the PHENIX Collaboration

2007-01-22T23:59:59.000Z

375

Electronically and ionically conductive porous material and method for manufacture of resin wafers therefrom  

DOE Patents (OSTI)

An electrically and ionically conductive porous material including a thermoplastic binder and one or more of anion exchange moieties or cation exchange moieties or mixtures thereof and/or one or more of a protein capture resin and an electrically conductive material. The thermoplastic binder immobilizes the moieties with respect to each other but does not substantially coat the moieties and forms the electrically conductive porous material. A wafer of the material and a method of making the material and wafer are disclosed.

Lin, YuPo J. (Naperville, IL); Henry, Michael P. (Batavia, IL); Snyder, Seth W. (Lincolnwood, IL)

2011-07-12T23:59:59.000Z

376

Effect of pore geometry in porous media on the miscibility of crude oil and carbon dioxide  

E-Print Network (OSTI)

EFFECT OF PORE GEOMETRY IN POROUS MEDIA ON THE MISCIBILITY OF CRUDE OIL AND CARBON DIOXIDE A Thesis by HAMED SARKHOSH Submitted to the Graduate College of Texas AIM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE May 1977 Major Subject: Petroleum Engineering EFFECT OF PORE GEOMETRY IN POROUS MEDIA ON THE MISCIBILITY OF CRUDE OIL AND CARBON DIOXIDE A Thesis by HAMED SARKHOSH Approved as to styie and content by Chai, an of Committee Head...

Sarkhosh, Hamed

1977-01-01T23:59:59.000Z

377

Three-Dimensional Reconstruction of Porous LSCF Cathodes D. Gostovic,*,z  

E-Print Network (OSTI)

In this initial study the electrochemically active region of a La0.8Sr0.2Co0.2Fe0.8O3- LSCF cathodeThree-Dimensional Reconstruction of Porous LSCF Cathodes D. Gostovic,*,z J. R. Smith,* D. P and heat.1 They consist of three basic layers: cathode, electrolyte, and anode. The cathode is a porous

Florida, University of

378

From Helical Array to Porous Architecture:? Exploring the Use of Side Chains of Amino Acids to Engineer 1D Infinite Coordination Polymeric Chain into Porous Frameworks  

Science Journals Connector (OSTI)

From Helical Array to Porous Architecture:? Exploring the Use of Side Chains of Amino Acids to Engineer 1D Infinite Coordination Polymeric Chain into Porous Frameworks ... State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, 350002, China, and Department of Chemistry and Chemical Engineering, Minjiang University, Fuzhou, 350108, China ... 5 The coordination mode of organic ligands could transform the coordination environment of the metal center, which could direct the linker to connect discrete metal complexes into a specific extended structure. ...

Ben-Yong Lou; Fei-Long Jiang; Ben-Lai Wu; Da-Qiang Yuan; Mao-Chun Hong

2006-02-21T23:59:59.000Z

379

DEVELOPMENT OF CONTINUOUS SOLVENT EXTRACTION PROCESSES FOR COAL DERIVED CARBON PRODUCTS  

SciTech Connect

The purpose of this DOE-funded effort is to develop continuous processes for solvent extraction of coal for the production of carbon products. These carbon products include materials used in metals smelting, especially in the aluminum and steel industries, as well as porous carbon structural material referred to as ''carbon foam'' and carbon fibers. During this reporting period, efforts have focused on the facility modifications for continuous hydrotreating, as well as developing improved protocols for producing synthetic pitches.

Elliot B. Kennel; Stephen P. Carpenter; Dady Dadyburjor; Manoj Katakdaunde; Liviu Magean; Peter G. Stansberry; Alfred H. Stiller; John W. Zondlo

2005-08-11T23:59:59.000Z

380

Effects of Surface Chemistry on the Porous Structure of Coal  

SciTech Connect

In this report, 129 Xe nuclear magnetic resonance spectroscopy of xenon gas adsorbed in coal is used to describe some poorly understood features of coal microporous structure, particularly in establishing that a connected network exists, the type of connectivity, and its changes with the rank of coal. Micropore size scale and distribution are also considered. Two methods are developed which are new and versatile tools for the investigation of porous structure. Both utilize xenon gas that is in motion, while undergoing diffusion or exchange in coal, to describe the connectivity of the micropore structure of coal. Time tracking of the adsorption process by NMR, selective saturation, and saturation transfer techniques were used to obtain new information on the coal rank dependence of porous structure. In addition, an existing 129 Xe chemical shift-pore diameter model was used to calculate micropore diameters for coals, as well as for a microporous carbon, before and after pore-size alteration. In the initial study performed, straightforward 129 Xe NMR spectra at equilibrium xenon adsorption at a series of pressures were acquired for a rank-varied set of six coals. Acquisition of the NMR signal as an echo was tested and found to improve spectral quality. The spectra were used to calculate micropore diameters for the six coals. These range from 5.6 to 7.5 ? and exhibit a minimum value for the intermediate coal rank. The smallest pores occur in coals of about 82-85% carbon; at both lower and higher coal ranks, the average micropore size tends to be larger. The changes in the spectra with coal rank and surface area were explored. Signal linewidths were found to decrease with increasing coal rank and were interpreted in terms of increasing chemical or physical homogeneity of the coal as rank increases. The packing density of powdered coal was found to alter the spectral appearance in a high volatile bituminous coal, which is preliminary evidence that exchange affects the chemical shift of xenon in this coal.

Ljubisa R. Radovic; Patrick G. Hatcher

1997-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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.


381

Reactive multilayer synthesis of hard ceramic foils and films  

DOE Patents (OSTI)

A method for synthesizing hard ceramic materials such as carbides, borides nd aluminides, particularly in the form of coatings provided on another material so as to improve the wear and abrasion performance of machine tools, for example. The method involves the sputter deposition of alternating layers of reactive metals with layers of carbon, boron, or aluminum and the subsequent reaction of the multilayered structure to produce a dense crystalline ceramic. The material can be coated on a substrate or formed as a foil which can be coild as a tape for later use.

Makowiecki, Daniel M. (Livermore, CA); Holt, Joseph B. (San Jose, CA)

1996-01-01T23:59:59.000Z

382

Measurements of the hard-x-ray reflectivity of iridium  

SciTech Connect

In connection with the design of a hard-x-ray telescope for the Constellation X-Ray Observatory we measured the reflectivity of an iridium-coated zerodur substrate as a function of angle at 55, 60, 70, and 80 keV at the National Synchrotron Light Source of Brookhaven National Laboratory. The optical constants were derived from the reflectivity data. The real component of the index of refraction is in excellent agreement with theoretical values at all four energies. However, the imaginary component, which is related to the mass attenuation coefficient, is 50% to 70% larger at 55, 60, and 70 keV than theoretical values.

Romaine, S.; Bruni, R.; Gorenstein, P.; Zhong, Z

2007-01-10T23:59:59.000Z

383

Grinding tool for making hemispherical bores in hard materials  

DOE Patents (OSTI)

A grinding tool for forming hemispherical bores in hard materials such as boron carbide. The tool comprises a hemicircular grinding bit, formed of a metal bond diamond matrix, which is mounted transversely on one end of a tubular tool shaft. The bit includes a spherically curved outer edge surface which is the active grinding surface of the tool. Two coolant fluid ports on opposite sides of the bit enable introduction of coolant fluid through the bore of the tool shaft so as to be emitted adjacent the opposite sides of the grinding bit, thereby providing optimum cooling of both the workpiece and the bit.

Duran, E.L.

1985-04-03T23:59:59.000Z

384

Head wear reduction in future hard-disk drives  

Science Journals Connector (OSTI)

Head wear and head vibration due to head-disk contact are two main issues that must be resolved for the future high-density Hard Disk Drives (HDDs). To reduce head wear, disk lubricant, carbon overcoat films on head and disk surfaces, head flying characteristics and so on have been studied. In this paper, we first show the effects of several parameters on head wear, including lubricant types, their MW, and disk burnishing. Our recent results on the effects of humidity and temperature on head wear are also explained. We then explain our extended wear equation and estimate the head wear life with present technologies.

Youichi Kawakubo; Shinnichi Nakazawa; Shinnichi Kobatake

2008-01-01T23:59:59.000Z

385

Quantum model of an autonomous oscillator in hard excitation regime  

E-Print Network (OSTI)

We propose the simple quantum model of nonlinear autonomous oscillator in hard excitation regime. We originate from classical equations of motion for similar oscillator and quantize them using the Lindblad master equation for the density matrix of this system. The solution for the populations of the stationary states of such oscillator may be explicitly found in the case when nonlinearity parameters of the problem are small. It was shown that in this situation there are three distinct regimes of behavior of the model. We compare properties of this model with corresponding ones of close open system, namely quantum oscillator in soft excitation regime. We discuss a possible applications of the results obtained.

E. D. Vol; M. A. Ialovega

2014-12-01T23:59:59.000Z

386

One dimensional Brownian motion in hard rods: adiabatic piston problem  

E-Print Network (OSTI)

We have investigated the motion characteristics of a movable piston immersed in a one dimensional gas of hard rods by event-oriented molecular dynamics in the absence of thermal noise. Periodic and reflecting boundary conditions are explored. It is shown that the piston undergoes systematic oscillations with decaying amplitudes in short times before it comes to global thermodynamic equilibrium. Moreover, the diffusion of the piston is explored and analytical expressions for its equilibrium mean-squared displacement is obtained. It is shown that MSD of the piston does not differ much from the normal rods despite its mass and length are significantly larger.

M. Ebrahim Foulaadvand; M. Mehdi Shafiee

2014-09-11T23:59:59.000Z

387

Linear Response Theory for Hard and Soft Glassy Materials  

SciTech Connect

Despite qualitative differences in their underlying physics, both hard and soft glassy materials exhibit almost identical linear rheological behaviors. We show that these nearly universal properties emerge naturally in a shear-transformation-zone (STZ) theory of amorphous plasticity, extended to include a broad distribution of internal thermal-activation barriers. The principal features of this barrier distribution are predicted by nonequilibrium, effective-temperature thermodynamics. Our theoretical loss modulus G{double_prime}({omega}) has a peak at the {alpha} relaxation rate, and a power law decay of the form {omega}{sup -{zeta}} for higher frequencies, in quantitative agreement with experimental data.

Langer, J. [University of California, Santa Barbara; Bouchbinder, Eran [Weizmann Institute of Science, Rehovot, Israel

2011-01-01T23:59:59.000Z

388

Anisotropic flow generated by hard partons in medium  

E-Print Network (OSTI)

Hard partons which are produced copiously in nuclear collisions at the LHC, deposit most of their energy and momentum into the surrounding quark-gluon plasma. We show that this generates streams in the plasma and contributes importantly to flow anisotropies. With the help of event-by-event three-dimensional perfect hydrodynamic simulations we calculate the observable azimuthal anisotropies of hadronic distributions and show that the proposed mechanism is capable of generating non-negligible part of the observed signal. Hence, it must be taken into account in quantitative studies in which one tries to extract the values of viscosities from the comparison of simulated results with measured data.

Tomasik, Boris

2015-01-01T23:59:59.000Z

389

Multi-Scale Indentation Hardness Testing; A Correlation and Model  

E-Print Network (OSTI)

. This test is performed by applying a steady load to an indenter (most commonly a diamond pyramid, diamond spheroconical, or a tungsten carbide ball) and then calculating the hardness from the area or depth of the 5 indentation. A dynamic indentation test... 6 variants are the indenter tip and the load applied. A tungsten carbide sphere or a diamond cone or pyramid is used to prevent the indenter tip from being damaged by the test piece. This consideration is made because test pieces have unique values...

Bennett, Damon W.

2010-01-20T23:59:59.000Z

390

Oil displacement through a porous medium with a temperature gradient  

E-Print Network (OSTI)

We investigate the effect of a temperature gradient on oil recovery in a two-dimensional pore-network model. The oil viscosity depends on temperature as, $\\mu_o=exp(B/T)$, where $B$ is a physico-chemical parameter depending on the type of oil, and $T$ is the temperature. A temperature gradient is applied across the medium in the flow direction. Initially, the porous medium is saturated with oil and, then, another fluid is injected. We have considered two cases representing different injection strategies. In the first case, the invading fluid viscosity is constant (finite viscosity ratio) while in the second one, the invading fluid is inviscid (infinite viscosity ratio). Our results show that, for the case of finite viscosity ratio, recovery increases with $\\Delta T$ independently on strength or sign of the gradient. For an infinite viscosity ratio, a positive temperature gradient is necessary to enhance recovery. Moreover, we show that, for $\\Delta T>0$, the percentage of oil recovery generally decreases (inc...

Oliveira, C L N; Herrmann, H J

2011-01-01T23:59:59.000Z

391

Dynamics of DNAPL penetration into fractured porous media  

SciTech Connect

Dense nonaqueous phase liquids (DNAPLs) that pool above stratigraphic contacts as a result of capillary forces can migrate downward through fractures in the underlying fine-grained layer. Although the DNAPL in the fracture is excluded from the surrounding porous matrix by capillary forces, the DNAPL constituent will dissolve and migrate by diffusion into the matrix. As a front of moderately soluble DNAPL advances into a fracture, the flux of dissolved material into the matrix increases until it becomes comparable to the rate of flow into the fracture, reducing the pressure in the DNAPL phase and slowing its advance. If the DNAPL front encounters a constriction with sufficiently large entry pressure, its advance will halt temporarily. But as the concentration gradients driving diffusion into the matrix decrease, there will be less DNAPL lost by diffusion and the DNAPL pressure at the constriction will increase until it exceeds the entry pressure, causing the downward advance of the front to suddenly resume. Because the time scales of diffusion are much slower than those of density flow, this analysis suggests that under certain circumstances a DNAPL can suddenly resume its downward advance after a long period of apparent immobility. In one plausible example, a dichloromethane front passes through 5 m of fractured clay in 16 days, is immobile for more than four years, and then suddenly moves again. Where this phenomenon is possible, removal of DNAPL to protect underlying aquifers becomes more important as a remediation goal.

Ross, B. [Disposal Safety Inc., Washington, DC (United States); Lu, N. [Colorado School of Mines, Golden, CO (United States). Div. of Engineering

1999-01-01T23:59:59.000Z

392

The Capacity-Cost Function of a Hard-Constrained In this paper we consider hard-constrained costly channels. By using the  

E-Print Network (OSTI)

1 The Capacity-Cost Function of a Hard-Constrained Channel Abstract: In this paper we consider hard-constrained costly channels. By using the thermodynamic formalism, we prove thats its capacity-cost function strictly convex and some other related properties. We also obtain estimates for the variations of the cost

Lopes, Artur Oscar

393

Sorption of petroleum products by carbon sorbents  

SciTech Connect

A comparative study of the adsorption of petroleum products by micro- and macroporous carbon sorbents was performed. For this purpose, four carbon sorbent samples prepared from various raw materials by various processing techniques were used. The following raw materials were used: (1) fuel mill from the Mezinoskoe deposit; (2) wood waste, shaving and sawdust in ratio (%) of 50:50; and (3) low-caking gas coal of the 2G group from the mine im.Kirova in the Kuznetsk Basin. The pore structures and adsorption capacities of these sorbents for petroleum products were studied. It was found that the adsorption of petroleum products on porous and nonporous carbon sorbents occurred in different manners. In this case, macroporous sorbents with a weakly developed structure of sorbing micro- and mesopores exhibited a maximum capacity for petroleum products.

M.A. Perederii; Y.I. Kurakov; I.N. Malikov; S.V. Molchanov [Institute for Fossil Fuels, Moscow (Russian Federation)

2009-07-01T23:59:59.000Z

394

Effects of passive porous walls on the first Mack mode instability of hypersonic boundary layers over a sharp cone.  

E-Print Network (OSTI)

??Passive porous coatings have been proposed in literature as a means of delaying transition to turbulence in hypersonic boundary layers. The nonlinear stability of hypersonic… (more)

Michael, Vipin George

2013-01-01T23:59:59.000Z

395

Issues in strategic management of large-scale software product line development  

E-Print Network (OSTI)

This thesis reflects on the issues and challenges large software product engineering managers face. Software is hard to engineer on a small scale, but at a larger scale, engineering and management tasks are even more ...

Nivoit, Jean-Baptiste (Jean-Baptiste Henri)

2013-01-01T23:59:59.000Z

396

Production of microporous aluminum oxide electrodes as supports for tethered lipid bilayers of large surface area.  

E-Print Network (OSTI)

1 Production of microporous aluminum oxide electrodes as supports for tethered lipid bilayers.Bourdillon@utc.fr Abstract A composite electrode made by association of gold and porous aluminum oxide has been used aluminum oxide; phospholipid bilayer; two-dimensional electrochemistry; ubiquinone lateral mobility. 1

Paris-Sud XI, Université de

397

New Products  

Science Journals Connector (OSTI)

...inches of fully foamed polyurethane insulation. Interior has "extra" side walls...self-diffusion coefficients, hardness, and thermal emf. J.s. (Ilikon Corp., Dept...need. Or they can be imprinted to your specifications. White or in colors, they accept any...

1962-10-19T23:59:59.000Z

398

An investigation on the effect of porosity on the transport properties of porous silicon  

Science Journals Connector (OSTI)

Microelectronics technology today is dominated exclusively by Silicon (Si). The inefficiency of Si to emit light even at cryogenic temperatures has been overcome with the discovery of porous silicon (PS) and its visible luminescence at room temperature. The present investigation aims at analysing the effect of increasing porosity on the transport properties of porous silicon with reference to field and temperature-dependent dark and photo conductivity and further substantiating the results with modulation techniques. Pure silicon wafer of n-type was made porous by immersion in an appropriate etchant for a few minutes. The conductivity was found to increase as porosity increased and this effect could be attributed to the increase in the trap levels, with increasing porosity. Temperature-dependent studies reveal a decrease in activation energy with increase in porosity indicating an increase in conductivity. Reflectance and electroreflectance measurements were used to calculate the band gap of porous silicon. It was found to lie closer to the direct band gap of silicon. A reduction in the band gap of porous silicon has been observed.

J. Merline Shyla; Francis P. Xavier; P. Sagayaraj

2013-01-01T23:59:59.000Z

399

Continuous time random walk analysis of solute transport in fractured porous media  

SciTech Connect

The objective of this work is to discuss solute transport phenomena in fractured porous media, where the macroscopic transport of contaminants in the highly permeable interconnected fractures can be strongly affected by solute exchange with the porous rock matrix. We are interested in a wide range of rock types, with matrix hydraulic conductivities varying from almost impermeable (e.g., granites) to somewhat permeable (e.g., porous sandstones). In the first case, molecular diffusion is the only transport process causing the transfer of contaminants between the fractures and the matrix blocks. In the second case, additional solute transfer occurs as a result of a combination of advective and dispersive transport mechanisms, with considerable impact on the macroscopic transport behavior. We start our study by conducting numerical tracer experiments employing a discrete (microscopic) representation of fractures and matrix. Using the discrete simulations as a surrogate for the 'correct' transport behavior, we then evaluate the accuracy of macroscopic (continuum) approaches in comparison with the discrete results. However, instead of using dual-continuum models, which are quite often used to account for this type of heterogeneity, we develop a macroscopic model based on the Continuous Time Random Walk (CTRW) framework, which characterizes the interaction between the fractured and porous rock domains by using a probability distribution function of residence times. A parametric study of how CTRW parameters evolve is presented, describing transport as a function of the hydraulic conductivity ratio between fractured and porous domains.

Cortis, Andrea; Cortis, Andrea; Birkholzer, Jens

2008-06-01T23:59:59.000Z

400

A generalized lattice Boltzmann model for flow through tight porous media with Klinkenberg's effect  

E-Print Network (OSTI)

Gas slippage occurs when the mean free path of the gas molecules is in the order of the characteristic pore size of a porous medium. This phenomenon leads to the Klinkenberg's effect where the measured permeability of a gas (apparent permeability) is higher than that of the liquid (intrinsic permeability). A generalized lattice Boltzmann model is proposed for flow through porous media that includes Klinkenberg's effect, which is based on the model of Guo et al. (Z.L. Guo et al., Phys.Rev.E 65, 046308 (2002)). The second-order Beskok and Karniadakis-Civan's correlation (A. Beskok and G. Karniadakis, Microscale Thermophysical Engineering 3, 43-47 (1999), F. Civan, Transp Porous Med 82, 375-384 (2010)) is adopted to calculate the apparent permeability based on intrinsic permeability and Knudsen number. Fluid flow between two parallel plates filled with porous media is simulated to validate model. Simulations performed in a heterogeneous porous medium with components of different porosity and permeability indicat...

Chen, Li; Kang, Qinjun; Hyman, Jeffrey De'Haven; Viswanathan, Hari S; Tao, Wen-Quan

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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.


401

Dynamics of Coupled Contaminant and Microbial Transport in Heterogeneous Porous Media: Purdue Component  

SciTech Connect

Dynamic microbial attachment/detachment occurs in subsurface systems in response to changing environmental conditions caused by contaminant movement and degradation. Understanding the environmental conditions and mechanisms by which anaerobic bacteria partition between aqueous and solid phases is a critical requirement for designing and evaluating in situ bioremediation efforts. This interdisciplinary research project, of which we report only the Purdue contribution, provides fundamental information on the attachment/detachment dynamics of bacteria in heterogeneous porous media. Fundamental results from the Purdue collaboration are: (a) development of a matched-index method for obtaining 3-D Lagrangian trajectories of microbial sized particles transporting within porous media or microflow cells, (b) application of advanced numerical methods to optimally design a microflow cell for studying anaerobic bacterial attachment/detachment phenomena, (c) development of two types of models for simulating bacterial movement and attachment/detachment in microflow cells and natural porous media, (d) application of stochastic analysis to upscale pore scale microbial attachment/detachment models to natural heterogeneous porous media, and (e) evaluation of the role nonlocality plays in microbial dynamics in heterogeneous porous media

Cushman, J.H.; Madilyn Fletcher

2000-06-01T23:59:59.000Z

402

Dynamics of Coupled Contaminant and Microbial Transport in Heterogeneous Porous Media: Purdue Component  

SciTech Connect

Dynamic microbial attachment/detachment occurs in subsurface systems in response to changing environmental conditions caused by contaminant movement and degradation. Understanding the environmental conditions and mechanisms by which anaerobic bacteria partition between aqueous and solid phases is a critical requirement for designing and evaluating in situ bioremediation efforts. This interdisciplinary research project, of which we report only the Purdue contribution, provides fundamental information on the attachment/detachment dynamics of bacteria in heterogeneous porous media. Fundamental results from the Purdue collaboration are: (a) development of a matched-index method for obtaining 3-D Lagrangian trajectories of microbial sized particles transporting within porous media or microflow cells, (b) application of advanced numerical methods to optimally design a microflow cell for studying anaerobic bacterial attachment/detachment phenomena, (c) development of two types of models for simulating bacterial movement and attachment/detachment in microflow cells and natural porous media, (d) application of stochastic analysis to upscale pore scale microbial attachment/detachment models to natural heterogeneous porous media, and (e) evaluation of the role nonlocality plays in microbial dynamics in heterogeneous porous media.

Cushman, J.H.

2000-06-01T23:59:59.000Z

403

Modelling the optical properties of composite and porous interstellar grains  

E-Print Network (OSTI)

There are indications that interstellar and interplanetary dust grains have an inhomogeneous and fluffy structure. We investigate different methods to describe light scattering by such composite particles. Both a model of layered particles and discrete dipole calculations for particles with Rayleigh and non-Rayleigh inclusions are used. The calculations demonstrate that porosity is a key parameter for determining light scattering. We find that the optical properties of the layered particles depend on the number and position of layers if the number of layers is small ($\\la 15$). For a larger number of layers the scattering characteristics become independent of the layer sequence. The optical properties of particles with inclusions depend on the size of inclusions provided the porosity is large. The scattering characteristics of very porous particles with inclusions of different sizes are found to be close to those of multi-layered spheres. We compare the results of these calculations with the predictions of the effective medium theories (EMT) which are often used in astronomy as a tool to calculate the optical properties of composite particles. The results of our analysis show that the internal structure of grains (layers versus inclusions) only slightly affects the optics of particles provided the porosity does not exceed 50%. It is also demonstrated that in this case the optical properties of composite grains calculated with EMT agree with the results of the exact method for layered particles. For larger porosity, the standard EMT rules (i.e., Garnett and Bruggeman rules) give reliable results for particles with Rayleigh inclusions only.

N. V. Voshchinnikov; V. B. Il'in; Th. Henning

2004-09-19T23:59:59.000Z

404

2010 New Mexico Water Research Symposium August 3, 2010 E-1 Photocatalytic Decontamination of Wastewater with Porous Material HNb3O8  

E-Print Network (OSTI)

characterized by BET, XRD, UV-Vis, SEM and TEM. Porous photocatalytic materials can have the combined qualities of Wastewater with Porous Material HNb3O8 Maryam Zarei Chaleshtori, University of Texas at El Paso, Center

Johnson, Eric E.

405

Rolling friction for hard cylinder and sphere on viscoelastic solid  

E-Print Network (OSTI)

We calculate the friction force acting on a hard cylinder or spherical ball rolling on a flat surface of a viscoelastic solid. The rolling friction coefficient depends non-linearly on the normal load and the rolling velocity. For a cylinder rolling on a viscoelastic solid characterized by a single relaxation time Hunter has obtained an exact result for the rolling friction, and our result is in very good agreement with his result for this limiting case. The theoretical results are also in good agreement with experiments of Greenwood and Tabor. We suggest that measurements of rolling friction over a wide range of rolling velocities and temperatures may constitute an useful way to determine the viscoelastic modulus of rubber-like materials.

B. N. J. Persson

2010-08-26T23:59:59.000Z

406

Theory of angular dispersive imaging hard x-ray spectrographs  

E-Print Network (OSTI)

A spectrograph is an optical instrument that disperses photons of different energies into distinct directions and space locations, and images photon spectra on a position-sensitive detector. Spectrographs consist of collimating, angular dispersive, and focusing optical elements. Bragg reflecting crystals arranged in an asymmetric scattering geometry are used as the dispersing elements. A ray-transfer matrix technique is applied to propagate x-rays through the optical elements. Several optical designs of hard x-ray spectrographs are proposed and their performance is analyzed. Spectrographs with an energy resolution of 0.1 meV and a spectral window of imaging up to a few tens of meVs are shown to be feasible for inelastic x-ray scattering (IXS) spectroscopy applications. In another example, a spectrograph with a 1-meV spectral resolution and 85-meV spectral window of imaging is considered for Cu K-edge resonant IXS (RIXS).

Shvyd'ko, Yuri

2015-01-01T23:59:59.000Z

407

Towards hard x-ray imaging at GHz frame rate  

SciTech Connect

Gigahertz (GHz) imaging using hard x-rays ( Greater-Than-Or-Equivalent-To 10 keV) can be useful to high-temperature plasma experiments, as well as research and applications using coherent photons from synchrotron radiation and x-ray free electron lasers. GHz framing rate can be achieved by using multiple cameras through multiplexing. The advantages and trade-offs of single-photon detection mode, when no more than one x-ray photon is detected per pixel, are given. Two possible paths towards x-ray imaging at GHz frame rates using a single camera are: (a) avalanche photodiode arrays of high-Z materials and (b) microchannel plate photomultipliers in conjunction with materials with large indices of refraction.

Wang Zhehui; Morris, C. L.; Kapustinsky, J. S.; Kwiatkowski, K.; Luo, S.-N. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2012-10-15T23:59:59.000Z

408

Towards hard X-ray imaging at GHz frame rate  

SciTech Connect

Gigahertz (GHz) imaging using hard X-rays ({approx}> 10 keV) can be useful to high-temperature plasma experiments, as well as research using coherent photons from synchrotron radiation and X-ray free electron lasers. GHz framing rate can be achieved by using multiple cameras through multiplexing. The advantages and trade-offs of single-photon detection mode, when no more than one X-ray photon is detected per pixel, are given. Two possible paths towards X-ray imaging at GHz frame rates using a single camera are (a) Avalanche photodiode arrays of high-Z materials and (b) Microchannel plate photomultipliers in conjunction with materials with large indices of refraction.

Wang, Zhehui [Los Alamos National Laboratory; Morris, Christopher [Los Alamos National Laboratory; Luo, Shengnian [Los Alamos National Laboratory; Kwiatkowski, Kris K. [Los Alamos National Laboratory; Kapustinsky, Jon S. [Los Alamos National Laboratory

2012-05-02T23:59:59.000Z

409

Method for producing hard-surfaced tools and machine components  

DOE Patents (OSTI)

In one aspect, the invention comprises a method for producing tools and machine components having superhard crystalline-ceramic work surfaces. Broadly, the method comprises two steps: a tool or machine component having a ceramic near-surface region is mounted in ion-implantation apparatus. The region then is implanted with metal ions to form, in the region, a metastable alloy of the ions and said ceramic. The region containing the alloy is characterized by a significant increase in hardness properties, such as microhardness, fracture-toughness, and/or scratch-resistance. The resulting improved article has good thermal stability at temperatures characteristic of typical tool and machine-component uses. The method is relatively simple and reproducible.

McHargue, C.J.

1981-10-21T23:59:59.000Z

410

Method for producing hard-surfaced tools and machine components  

DOE Patents (OSTI)

In one aspect, the invention comprises a method for producing tools and machine components having superhard crystalline-ceramic work surfaces. Broadly, the method comprises two steps: A tool or machine component having a ceramic near-surface region is mounted in ion-implantation apparatus. The region then is implanted with metal ions to form, in the region, a metastable alloy of the ions and said ceramic. The region containing the alloy is characterized by a significant increase in hardness properties, such as microhardness, fracture-toughness, and/or scratch-resistance. The resulting improved article has good thermal stability at temperatures characteristic of typical tool and machine-component uses. The method is relatively simple and reproducible.

McHargue, Carl J. (Farragut, TN)

1985-01-01T23:59:59.000Z

411

Hard-core lattice model of multiphase systems  

Science Journals Connector (OSTI)

The cooperative-problem lattice model for gases, liquids, and solids on a face-centered-cubic lattice is approximately solved. A hard-core interaction is assumed between particles on nearest-, next-nearest-, and on next-but-one nearest-neighbor lattice sites. Particles on lattice sites which are at a greater distance from one another are connected by an arbitrary soft pair interaction whose zero Fourier component may be positive or negative. By considering not only homogeneous particle distributions but also some simple periodical particle distributions on the lattice we can, in the case of a mean attractive soft particle interaction, prove the possibility of the existence of four thermodynamical stable phases: a gas phase, a liquid phase, a solid modification with a face-centered-cubic periodical structure, and a solid modification with a simple cubic periodical structure. Transitions between these phases can take place.

H. P. Neumann

1975-10-01T23:59:59.000Z

412

Long duration hard X-ray transatlantic payload  

SciTech Connect

The HXR80M large-area hard X-ray experiment, to be flown aboard a transatlantic balloon, is described. The detectors are two multiwire spectroscopic proportional counters (MWSPC) with a 2700-sq-cm sensitive area each. The two detectors are filled with an extremely pure xenon-isobutane mixture at high pressure (3-6 atm) in order to obtain good spectral resolution and high efficiency. The onboard data handling is performed by microprocessor-controlled electronics. The scientific aim of the experiment is the survey of the sky belt around the 38th parallel and in particular the observation of faint galactic objects and galactic binary systems in the 15-200 keV range.

La Padula, C.D.; Bazzano, A.; Boccaccini, L.; Mastropietro, M.; Patriarca, R.; Polcaro, V.F.; Ubertini, P.

1981-01-01T23:59:59.000Z

413

Effective interaction approach to the Fermi hard-sphere system  

E-Print Network (OSTI)

The formalism based on correlated basis functions and the cluster expansion technique has been recently employed to derive an effective interaction from a realistic nuclear hamiltonian. To gauge the reliability of this scheme, we perform a systematic comparison between the results of its application to the Fermi hard-sphere system and the predictions obtained from low-density expansions, as well as from other many-body techniques. The analysis of a variety of properties, including the ground state energy, the effective mass and the momentum distribution, shows that the effective interaction approach is remarkably accurate, thus suggesting that it may be employed to achieve a consistent description of the structure and dynamics of nuclear matter in the density region relevant to astrophysical applications.

Angela Mecca; Alessandro Lovato; Omar Benhar; Artur Polls

2014-10-31T23:59:59.000Z

414

Effective interaction approach to the Fermi hard-sphere system  

E-Print Network (OSTI)

The formalism based on correlated basis functions and the cluster expansion technique has been recently employed to derive an effective interaction from a realistic nuclear hamiltonian. To gauge the reliability of this scheme, we perform a systematic comparison between the results of its application to the Fermi hard-sphere system and the predictions obtained from low-density expansions, as well as from other many-body techniques. The analysis of a variety of properties, including the ground state energy, the effective mass and the momentum distribution, shows that the effective interaction approach is remarkably accurate, thus suggesting that it may be employed to achieve a consistent description of the structure and dynamics of nuclear matter in the density region relevant to astrophysical applications.

Mecca, Angela; Benhar, Omar; Polls, Artur

2014-01-01T23:59:59.000Z

415

Fluid breakup during simultaneous two-phase flow through a three-dimensional porous medium  

E-Print Network (OSTI)

We use confocal microscopy to directly visualize the simultaneous flow of both a wetting and a non-wetting fluid through a model three-dimensional (3D) porous medium. We find that, for small flow rates, both fluids flow through unchanging, distinct, connected 3D pathways; in stark contrast, at sufficiently large flow rates, the non-wetting fluid is broken up into discrete ganglia. By performing experiments over a range of flow rates, using fluids of different viscosities, and with porous media having different geometries, we show that this transition can be characterized by a state diagram that depends on the capillary numbers of both fluids, suggesting that it is controlled by the competition between the viscous forces exerted on the flowing oil and the capillary forces at the pore scale. Our results thus help elucidate the diverse range of behaviors that arise in two-phase flow through a 3D porous medium.

Sujit S. Datta; Jean-Baptiste Dupin; David A. Weitz

2014-06-26T23:59:59.000Z

416

First evidence of anisotropic quenched disorder effects on a smectic liquid crystal confined in porous silicon  

E-Print Network (OSTI)

We present a neutron scattering analysis of the structure of the smectic liquid crystal octylcyanobiphenyl (8CB) confined in one-dimensional nanopores of porous silicon films (PS). The smectic transition is completely suppressed, leading to the extension of a short-range ordered smectic phase aligned along the pore axis. It evolves reversibly over an extended temperature range, down to 50 K below the \\textit{N-SmA} transition in pure 8CB. This behavior strongly differs from previous observations of smectics in different one-dimensional porous materials. A coherent picture of this striking behavior requires that quenched disorder effects are invoked. The strongly disordered nature of the inner surface of PS acts as random fields coupling to the smectic order. The one-dimensionality of PS nano-channels offers new perspectives on quenched disorder effects, which observation has been restricted to homogeneous random porous materials so far.

Régis Guégan; Denis Morineau; Claude Loverdo; Wilfried Béziel; Mohammed Guendouz

2005-11-08T23:59:59.000Z

417

Fractional-calculus model for temperature and pressure waves in fluid-saturated porous rocks  

Science Journals Connector (OSTI)

We study a fractional time derivative generalization of a previous Natale-Salusti model about nonlinear temperature and pressure waves, propagating in fluid-saturated porous rocks. Their analytic solutions, i.e., solitary shock waves characterized by a sharp front, are here generalized, introducing a formalism that allows memory mechanisms. In realistic wave propagation in porous media we must take into account spatial or temporal variability of permeability, diffusivity, and other coefficients due to the system “history.” Such a rock fracturing or fine particulate migration could affect the rock and its pores. We therefore take into account these phenomena by introducing a fractional time derivative to simulate a memory-conserving formalism. We also discuss this generalized model in relation to the theory of dynamic permeability and tortuosity in fluid-saturated porous media. In such a realistic model we obtain exact solutions of Burgers’ equation with time fractional derivatives in the inviscid case.

Roberto Garra

2011-09-26T23:59:59.000Z

418

The influence of internal pore pressure during roll forming of structurally porous metals  

SciTech Connect

Structurally porous metal sandwich panels consisting of dense face sheets and porous cores of controlled relative density can be manufactured by trapping inert gas during hot isostatic pressing and modifying its distribution via subsequent thermo-mechanical forming. At high pressures, the internal gas is expected to influence the forming response. This paper describes a model for the roll forming of a porous metal panel and its use to explore the effects of internal pore pressure upon rolling response. It is shown that for gas pressures below about half the yield strength of the fully dense matrix material, there is essentially no influence on the forming response. Only in the case of very high initial pore pressures or at relative densities approaching full theoretical does a noticeable effect arise. In this case, a limiting upper density is attainable which depends on the specific rolling conditions and geometry.

Elzey, D.M.; Wadley, H.N.G. [Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

1998-12-31T23:59:59.000Z

419

Inorganic Graphenylene: A Porous Two-Dimensional Material With Tunable Band Gap  

E-Print Network (OSTI)

By means of ab initio calculations we investigate the possibility of existence of a boron nitride (BN) porous two-dimensional nanosheet which is geometrically similar to the carbon allotrope known as biphenylene carbon. The proposed structure, which we called Inorganic Graphenylene (IGP), is formed spontaneously after selective dehydrogenation of the porous Boron Nitride (BN) structure proposed by Ding et al. We study the structural and electronic properties of both porous BN and IGP and it is shown that, by selective substitution of B and N atoms with carbon atoms in these structures, the band gap can be significantly reduced, changing their behavior from insulators to semiconductors, thus opening the possibility of band gap engineering for this class of two-dimensional materials.

Perim, Eric; Atreto, Pedro Alves da Silva; Galvão, Douglas

2014-01-01T23:59:59.000Z

420

Porous wall hollow glass microspheres as a medium or substrate for storage and formation of novel materials  

DOE Patents (OSTI)

Porous wall hollow glass microspheres are provided as a template for formation of nanostructures such as carbon nanotubes, In addition, the carbon nanotubes in combination with the porous wall hollow glass microsphere provides an additional reaction template with respect to carbon nanotubes.

Wicks, George G; Serkiz, Steven M.; Zidan, Ragaiy; Heung, Leung K.

2014-06-24T23:59:59.000Z

Note: This page contains sample records for the topic "hard porous product" 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.


421

Modelling two-phase flow in porous media at the pore scale using the volume-of-fluid method  

Science Journals Connector (OSTI)

We present a stable numerical scheme for modelling multiphase flow in porous media, where the characteristic size of the flow domain is of the order of microns to millimetres. The numerical method is developed for efficient modelling of multiphase flow ... Keywords: Pore-scale modelling, Porous media, Two-phase flow, Volume of fluid

Ali Q. Raeini; Martin J. Blunt; Branko Bijeljic

2012-07-01T23:59:59.000Z

422

Hydro-Mechanical Coupling in Damaged Porous Media Containing Isolated Cracks or/and Vugs: Model and Computations  

E-Print Network (OSTI)

Hydro-Mechanical Coupling in Damaged Porous Media Containing Isolated Cracks or/and Vugs: Model In this paper we present the development of the macroscopic model describing the hydro-mechanical coupling model in the micro-porous domain saturated by a fluid. In the crack/vug domain the Stokes equation

Paris-Sud XI, Université de

423

E-Print Network 3.0 - aspo hard rock Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

60 Merguerian, Charles; and Ozdemir, Levent, 2003, Rock Mass Properties and Hard Rock TBM Penetration Rate Investigations, Queens Tunnel Complex, NYC Water Tunnel 3, Stage 2: p....

424

Xcel Energy- Residential and Hard-to-Reach Standard Offer Program  

Energy.gov (U.S. Department of Energy (DOE))

The Residential and Hard-to-Reach Standard Offer Programs provide incentives to "Project Sponsors" to install energy efficiency measures in Xcel's service area. Residential customers should...

425

Dynamic Scheduling of Hard RealTime Applications in Open System Environment  

E-Print Network (OSTI)

Dynamic Scheduling of Hard Real­Time Applications in Open System Environment Z. Deng J. W.­S. Liu J

426

E-Print Network 3.0 - aespoe hard rock Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Collection: Mathematics 75 JUST OUTSIDE OUR DOOR by Dave Shinkle Summary: in boots and gloves Worked hard along the way Doing all the other things. Their sweat stained...

427

Dependence of Hard X-ray Emissions with the Charging Pressure in a Small Plasma Focus  

Science Journals Connector (OSTI)

The dependence with the filling pressure of the hard X-ray emission of a 250 J Plasma-Focus device is presented. The study was performed...

M. Barbaglia; L. Soto; A. Clausse

2012-04-01T23:59:59.000Z

428

Applications of porous electrodes to metal-ion removal and the design of battery systems  

SciTech Connect

This dissertation treats the use of porous electrodes as electrochemical reactors for the removal of dilute metal ions. A methodology for the scale-up of porous electrodes used in battery applications is given. Removal of 4 ..mu..g Pb/cc in 1 M sulfuric acid was investigated in atmospheric and high-pressure, flow-through porous reactors. The atmospheric reactor used a reticulated vitreous carbon porous bed coated in situ with a mercury film. Best results show 98% removal of lead from the feed stream. Results are summarized in a dimensionless plot of Sherwood number vs Peclet number. High-pressure, porous-electrode experiments were performed to investigate the effect of pressure on the current efficiency. Pressures were varied up to 120 bar on electrode beds of copper or lead-coated spheres. The copper spheres showed high hydrogen evolution rates which inhibited lead deposition, even at high cathodic overpotentials. Use of lead spheres inhibited hydrogen evolution but often resulted in the formation of lead sulfate layers; these layers were difficult to reduce back to lead. Experimental data of one-dimensional porous battery electrodes are combined with a model for the current collector and cell connectors to predict ultimate specific energy and maximum specific power for complete battery systems. Discharge behavior of the plate as a whole is first presented as a function of depth of discharge. These results are combined with the voltage and weight penalties of the interconnecting bus and post, positive and negative active material, cell container, etc. to give specific results for the lithium-aluminum/iron sulfide high-temperature battery. Subject to variation is the number of positive electrodes, grid conductivity, minimum current-collector weight, and total delivered capacity. The battery can be optimized for maximum energy or power, or a compromise design may be selected.

Trost, G.G.

1983-09-01T23:59:59.000Z

429

The Thermal Expansion, Elastic and Fracture Properties of Porous Cordierite at Elevated Temperatures  

SciTech Connect

The properties that determine the thermal shock resistance in materials are reported for porous cordierite, a leading candidate material for the fabrication of diesel particulate filters. Fracture toughness and slow crack growth tests were performed on test specimens obtained from the walls of diesel particulate filter monolithic substrates using the double-torsion test method at temperatures between 20 C and 900 C. The thermal expansion and elastic properties were characterized between 20 C and 1000 C. The role of the microstructure of porous cordierite in determining its unusual thermal expansion and elevated temperature Young's modulus and fracture toughness are discussed.

Shyam, Amit [ORNL; Lara-Curzio, Edgar [ORNL; Pandey, Amit [ORNL; Watkins, Thomas R [ORNL; More, Karren [Oak Ridge National Laboratory (ORNL)

2012-01-01T23:59:59.000Z

430

Infrasonic response characteristics of gas? and liquid?filled porous media  

Science Journals Connector (OSTI)

The infrasonic (0.15–30 Hz) responses of several nitrogen?saturated porous models are measured experimentally. Within the frequency range covered the results verify a theory proposed earlier by Smith and Greenkorn [J. Acoust. Soc. Am. 52 247–253 (1972)]. Results of a similar response study of water?filled porous media show the effect of dynamic coupling between the solid and fluid phases the excitation of which precludes agreement with a rigid frame theory. However the results significantly indicate an approach to a condition of zero coupling at very low frequencies and/or low permeabilities.

Peter G. Smith; Robert A. Greenkorn; Ronald G. Barile

1974-01-01T23:59:59.000Z

431

The displacement of oil from porous media by in-situ combustion  

E-Print Network (OSTI)

THE DISPLACEMENT OF OIL FROM POROUS MEDIA BY IN-SITU COMBUSTION A Thesis by JOHN T. CORCORAN Submitted to the Graduate College of Texas AgcM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December... f970 Major Subject: PETROLEUM ENGINEERING TIRE DISPLACEMENT OF OIL FROM POROUS MEDIA BY IN-SITU COMBUSTION A Thesis JOHN T. CORCORAN Approved as to style and content by: (C i man of Committee) ( em er (Hea. d of Department (Member) December...

Corcoran, John Thomas

1970-01-01T23:59:59.000Z

432

Local Wettability Reversal during Steady-State Two-Phase Flow in Porous Media  

E-Print Network (OSTI)

We study the effect of local wettability reversal on remobilizing immobile fluid clusters in steady-state two-phase flow in porous media. We consider a two dimensional network model for porous medium and introduce a wettability alteration mechanism. A qualitative change in the steady state flow patterns, destabilizing the percolating and trapped clusters, is observed as the system wettability is varied. When capillary forces are strong a finite wettability alteration is necessary to move the system from single-phase to two-phase flow regime. For the case of both phases being mobile we find a linear relationship between fractional flow and wettability alteration.

Sinha, Santanu; Ødegården, Torgeir Bryge; Skjetne, Erik; Hansen, Alex; 10.1103/PhysRevE.84.037303

2012-01-01T23:59:59.000Z

433

Solid oxide fuel cells having porous cathodes infiltrated with oxygen-reducing catalysts  

DOE Patents (OSTI)

Solid-oxide fuel cells include an electrolyte and an anode electrically coupled to a first surface of the electrolyte. A cathode is provided, which is electrically coupled to a second surface of the electrolyte. The cathode includes a porous backbone having a porosity in a range from about 20% to about 70%. The porous backbone contains a mixed ionic-electronic conductor (MIEC) of a first material infiltrated with an oxygen-reducing catalyst of a second material different from the first material.

Liu, Meilin; Liu, Ze; Liu, Mingfei; Nie, Lifang; Mebane, David Spencer; Wilson, Lane Curtis; Surdoval, Wayne

2014-08-12T23:59:59.000Z

434

Drying by Cavitation and Poroelastic Relaxations in Porous Media with Macroscopic Pores Connected by Nanoscale Throats  

E-Print Network (OSTI)

We investigate the drying dynamics of porous media with two pore diameters separated by several orders of magnitude. Nanometer-sized pores at the edge of our samples prevent air entry, while drying proceeds by heterogeneous nucleation of vapor bubbles (cavitation) in the liquid in micrometer-sized voids within the sample. We show that the dynamics of cavitation and drying are set by the interplay of the deterministic poroelastic mass transport in the porous medium and the stochastic nucleation process. Spatio-temporal patterns emerge in this unusual reaction-diffusion system, with temporal oscillations in the drying rate and variable roughness of the drying front.

Olivier Vincent; David A. Sessoms; Erik J. Huber; Jules Guioth; Abraham D. Stroock

2014-02-27T23:59:59.000Z

435

Continuous-time random-walk model of transport in variably saturated heterogeneous porous media  

Science Journals Connector (OSTI)

We propose a unified physical framework for transport in variably saturated porous media. This approach allows fluid flow and solute migration to be treated as ensemble averages of fluid and solute particles, respectively. We consider the cases of homogeneous and heterogeneous porous materials. Within a fractal mobile-immobile continuous time random-walk framework, the heterogeneity will be characterized by algebraically decaying particle retention times. We derive the corresponding (nonlinear) continuum-limit partial differential equations and we compare their solutions to Monte Carlo simulation results. The proposed methodology is fairly general and can be used to track fluid and solutes particles trajectories for a variety of initial and boundary conditions.

Andrea Zoia; Marie-Christine Néel; Andrea Cortis

2010-03-04T23:59:59.000Z

436

Characterizing properties of fractured porous media using x-ray computed tomography  

E-Print Network (OSTI)

CHARACTERIZING PROPERTIES OF FRACTURED POROUS MEDIA USING X-RAY COMPUTED TOMOGRAPHY A Thesis by JAMES MUDRA IV Submitted to the O f f i c e of Graduate Studies of Texas A&M University- p a r t i a l f u l f i l l m e n t of the requirements f... or the degree of MASTER OF SCIENCE December 1990 Major Subject: Chemical Engineering CHARACTERIZING PROPERTIES OF FRACTURED POROUS MEDIA USING X-RAY COMPUTED TOMOGRAPHY A Thesis by JAMES MUDRA IV Approved as to s t y l e and content by: (Member) (Head...

Mudra, James

2012-06-07T23:59:59.000Z

437

A simple model of gas flow in a porous powder compact  

SciTech Connect

This report describes a simple model for ideal gas flow from a vessel through a bed of porous material into another vessel. It assumes constant temperature and uniform porosity. Transport is treated as a combination of viscous and molecular flow, with no inertial contribution (low Reynolds number). This model can be used to fit data to obtain permeability values, determine flow rates, understand the relative contributions of viscous and molecular flow, and verify volume calibrations. It draws upon the Dusty Gas Model and other detailed studies of gas flow through porous media.

Shugard, Andrew D.; Robinson, David B.

2014-04-01T23:59:59.000Z

438

Mesoscopic modeling of multi-physicochemical transport phenomena in porous media  

SciTech Connect

We present our recent progress on mesoscopic modeling of multi-physicochemical transport phenomena in porous media based on the lattice Boltzmann method. Simulation examples include injection of CO{sub 2} saturated brine into a limestone rock, two-phase behavior and flooding phenomena in polymer electrolyte fuel cells, and electroosmosis in homogeneously charged porous media. It is shown that the lattice Boltzmann method can account for multiple, coupled physicochemical processes in these systems and can shed some light on the underlying physics occuning at the fundamental scale. Therefore, it can be a potential powerful numerical tool to analyze multi-physicochemical processes in various energy, earth, and environmental systems.

Kang, Qinjin [Los Alamos National Laboratory; Wang, Moran [Los Alamos National Laboratory; Mukherjee, Partha P [Los Alamos National Laboratory; Lichtner, Peter C [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

439

Forward physics hard processes and saturation: theory and phenomenology review  

E-Print Network (OSTI)

Selected aspects of the theory and phenomenology of production of forward jets at the LHC and RHIC are overviewed. In the theory part we discuss basics of frameworks originating from the BFKL dynamics while in the phenomenology part we present results for forward-central jet correlations at the LHC and forward di-jet production at RHIC.

Krzysztof Kutak

2011-12-19T23:59:59.000Z

440

Regularized reconstruction of the differential emission measure from solar flare hard X-ray spectra  

E-Print Network (OSTI)

Regularized reconstruction of the differential emission measure from solar flare hard X-ray spectra for solar flare hard X-rays, it is currently unclear whether the electron distribution responsible between (T) and J( ). However, in the last years, two issues have made this inversion problem more

Piana, Michele

Note: This page contains sample records for the topic "hard porous product" 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

Comparing radiation tolerant materials and devices for ultra rad-hard tracking Mara Bruzzi  

E-Print Network (OSTI)

resistance. This report compares directly the data on the performance of rad-hard materials and devicesComparing radiation tolerant materials and devices for ultra rad-hard tracking detectors Mara experiments of the future generation can be satisfied either with materials which are inherently more

California at Santa Cruz, University of

442

STRAIN SENSING WITH PIEZOELECTRIC ZINC OXIDE THIN FILMS FOR VIBRATION SUPPRESSION IN HARD DISK DRIVES  

E-Print Network (OSTI)

was successfully obtained while the suspension was flying on a disk as in normal drive operation. PreliminarySTRAIN SENSING WITH PIEZOELECTRIC ZINC OXIDE THIN FILMS FOR VIBRATION SUPPRESSION IN HARD DISK This paper describes the integration of thin film ZnO strain sensors onto hard disk drive suspensions

Horowitz, Roberto

443

Free Energy of an Assembly of Nonspherical Molecules with a Hard Core  

Science Journals Connector (OSTI)

The free energy of an assembly of slightly nonspherical molecules with a hard core is expressed as the sum of the free energy of a system of equivalent hard spheres plus correction terms related to eccentricity. An estimate of these terms is made for ellipsoidal molecules.

A. Bellemans

1968-08-19T23:59:59.000Z

444

An in-vacuum wiggler for SOLEIL Hard X-rays spectral range  

SciTech Connect

The production of Hard X-rays has become a tricky problem on medium energy storage rings. It requires Insertion Devices (IDs) with high magnetic field and a large number of periods. To cover the 20-50 keV photon energy range at SOLEIL (2.75 GeV), an in-vacuum wiggler (WSV50) has been preferred to a superconducting ID. The wiggler is composed of 38 periods of 50 mm producing a 2.1 T field at a minimum magnetic gap of 5.5 mm. To minimize the magnetic forces acting between magnet arrays (8.5 tons), a compensation system composed of non magnetic springs has been mounted apart from the magnet system to reduce the mechanical deformations. The wiggler has been assembled step by step by means of a genetic algorithm which minimizes the magnetic errors measured with a flipping coil. This paper presents the mechanical and magnetic design of the wiggler as well as the construction and the magnetic measurements.

Marcouille, O.; Chapuis, L.; Brunelle, P.; Berteaud, P.; Couprie, M.-E.; Filhol, J.-M.; Herbeaux, C.; Marlats, J.-L.; Massal, M.; Mary, A.; Tavakoli, K.; Valleau, M.; Veteran, J. [Synchrotron SOLEIL, L'Orme des Merisiers, Bat. A, Saint-Aubin, Gif-sur-Yvette- 9119 (France)

2010-06-23T23:59:59.000Z

445

Society of Petroleum Engineers Simulation of Foam Transport in Porous Media  

E-Print Network (OSTI)

Society of Petroleum Engineers SPE 26402 Simulation of Foam Transport in Porous Media A.R. Kovscek, T.W. Patzek, and C.J. Radke, U. of California SPE Members Copyright 1993, Society of Petroleum and Exhibition of the Society of Petroleum Engineers held in Houston, Texas, 3-6 October 1993. This paper

Patzek, Tadeusz W.

446

Aspects of non-Newtonian flow and displacement in porous media  

SciTech Connect

The rheology of many heavy oils has been shown to be non-Newtonian, Bingham plastics being one manifestation of heavy oil flow. In EOR applications, non-Newtonian fluids such as low concentration polymer solutions, emulsions, gels etc. are simultaneously injected to increase the viscosity of driving agents that displace oil. Such rheologically complex fluids are used to improve sweep efficiencies, divert displacing fluids and block swept zones. The present study has been undertaken to understand the flow of non-Newtonian fluids through porous media. The work considered involves the numerical (pore network) modeling of both single and multiphase flow of power-law and Bingham plastic fluids in network-like porous media. We consider aspects of both single- and multi-phase flow and displacement. Section 2 describes elementary aspects of non-Newtonian flow and some simple models for porous media. Viscoelastic effects in the flow of non-Newtonian fluids are also discussed. The section includes a brief literature review on non-Newtonian flow in porous media. Section 3 describes single-phase flow.

Shah, C.; Yortsos, Y.C.

1993-02-01T23:59:59.000Z

447

Manufacturable extremal low-dielectric, high-stiffness porous materials S. Torquatoa  

E-Print Network (OSTI)

level of porosity. This structural design is crucial to the integration of porous low the thermomechanical performance. This article demonstrates a contemporary protocol for materials by design. Applying-dielectric materials into microelectronics and should serve as a guide to future synthetic efforts. Using recently

Torquato, Salvatore

448

ON THE CORROSION RESISTANCE OF POROUS ELECTROPLATED ZINC COATINGS IN DIFFERENT CORROSIVE MEDIA  

E-Print Network (OSTI)

1 ON THE CORROSION RESISTANCE OF POROUS ELECTROPLATED ZINC COATINGS IN DIFFERENT CORROSIVE MEDIA Y(0)546457272. e-mail : fpedraza@univ-lr.fr Abstract The corrosion resistance of an electroplated (EP) Zn coating corrosive media (NaCl, NaOH and rain water). Four different faradaic relaxation processes were clearly

Paris-Sud XI, Université de

449

Highly efficient carbon dioxide capture with a porous organic polymer impregnated with  

E-Print Network (OSTI)

Highly efficient carbon dioxide capture with a porous organic polymer impregnated environmental crises such as global warming and ocean acidication, efficient carbon dioxide (CO2) capture As CO2 capture mate- rials, numerous solid adsorbents such as silica5 and carbon materials,6 metal

Paik Suh, Myunghyun

450

Integrated Adaptive Numerical Methods for Transient Two-phase Flow in Heterogeneous Porous Media  

E-Print Network (OSTI)

remediation, magma flow in the earth crust and water management in porous electrodes of PEM fuel cells in fuel cells. This thesis presents a set of algorithms that are integrated efficiently to achieve the transport equations which elim- inates unnecessary and costly solution of the implicit pressure

Victoria, University of

451

DOI: 10.1002/adma.200601354 Micropatterned Porous-Silicon Bragg Mirrors by Dry-Removal  

E-Print Network (OSTI)

DOI: 10.1002/adma.200601354 Micropatterned Porous-Silicon Bragg Mirrors by Dry-Removal Soft is reversible, the films can be cycled through multiple detec- tion runs without additional preparation steps- vious efforts in our group have demonstrated the effectiveness of PSi pattern formation by dry-removal

Buratto, Steve

452

Extraction of naphthenic acid from kerosene using porous and nonporous polymeric membranes  

SciTech Connect

A systematic study of membrane-assisted extraction of naphthenic acids from hydrocarbon fractions by aqueous caustic soda using both porous and nonporous membranes is reported. The effects of hydrodynamic factors, concentration of naphthenic acids and caustic soda, and temperature on the transmembrane flux are discerned. The film model is used to determine the intrinsic mass transfer characteristics of the membranes.

Netke, S.A.; Pangarkar, V.G. [Univ. of Bombay, Matunga (India)

1996-01-01T23:59:59.000Z

453

A Study of Heat Transfer in a Composite Wall Collector System with Porous Absorber  

E-Print Network (OSTI)

In this paper, heat transfer and flow in a composite solar wall with porous absorber has been studied. The unsteady numerical simulation is employed to analyze the performance of the flow and temperature field in the composite solar wall. The excess...

Chen, W.

2006-01-01T23:59:59.000Z

454

Lattice Boltzmann method for modeling liquid-vapor interface configurations in porous media  

E-Print Network (OSTI)

Lattice Boltzmann method for modeling liquid-vapor interface configurations in porous media Michael; published 13 January 2004. [1] The lattice Boltzmann method (LBM) has emerged as a powerful tool: Modeling; 3230 Mathematical Geophysics: Numerical solutions; KEYWORDS: Lattice Boltzmann Citation: Sukop, M

Sukop, Mike

455

Lattice Boltzmann simulation of chemical dissolution in porous media Qinjun Kang  

E-Print Network (OSTI)

Lattice Boltzmann simulation of chemical dissolution in porous media Qinjun Kang Los Alamos August 2001; published 7 March 2002 In this paper, we develop a lattice Boltzmann model for simulating. The dissolution of carbonate rocks in 0.5M HCl and 0.5M HAc is simulated with the lattice Boltzmann model

Zhang, Dongxiao

456

Thermosolutal convection from a discrete heat and solute source in a vertical porous annulus  

E-Print Network (OSTI)

on the fluid flow and heat and mass transfer rates. The porous annulus is subject to heat and mass fluxes from, buoyancy ratio and radius ratio are investigated on the flow patterns, and heat and mass transfer rates and the rates of heat and mass transfer strongly depend on the location of the heat and solute source. Further

Lopez, John M.

457

The averaging of gravity currents in porous media Daniel M. Andersona)  

E-Print Network (OSTI)

or contain DNAPL contaminants in porous medium systems.2,3 Since the brines used in these remediation groundwater cleanup strategies involving injected brines. We derive averaged solutions using homogenization the past few decades, releases of contaminants that are immiscible with water into the shallow subsurface

Anderson, Daniel M.

458

Micro Catalytic Combustor with Pd/Nano-porous Alumina for High-Temperature Application  

E-Print Network (OSTI)

, the mixture temperature at the combustor inlet is set to 630 o C. Thermal conductivity of the ceramic wall Keywords: Catalytic combustion, Pd/nano-porous alumina, Ceramic tape casting, Thermophotovoltaic Abstract: A micro-scale catalytic combustor using high-precision ceramic tape-casting technology has been developed

Kasagi, Nobuhide

459

A NOVEL MATHEMATICAL TOOL FOR CHARACTERIZING PETROLEUM FLUID RHEOLOGY WITHIN POROUS MEDIA  

E-Print Network (OSTI)

or gas entries in the vicinity of a petroleum well. The same profile can also be used to determine1 A NOVEL MATHEMATICAL TOOL FOR CHARACTERIZING PETROLEUM FLUID RHEOLOGY WITHIN POROUS MEDIA M and pressure distribution in a petroleum reservoir during thermal operations. The rate equation

Hossain, M. Enamul

460

Effective Darcy-scale contact angles in porous media imbibing solutions of various surface tensions  

E-Print Network (OSTI)

Effective Darcy-scale contact angles in porous media imbibing solutions of various surface tensions was to develop and test a methodology to determine whether these surface tension effects predictably alter of 25° for the NaNO3 solution solely on the basis of surface tension contrast. The results of this study

Selker, John

Note: This page contains sample records for the topic "hard porous product" 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

Computation of Axisymmetric Suction Flow Through Porous Media in the Presence of Surface Tension  

E-Print Network (OSTI)

Computation of Axisymmetric Suction Flow Through Porous Media in the Presence of Surface Tension-mail: hdc@math.ucsb.edu; hsi@us.oracle.com The e#11;ect of small surface tension on a class of axi for this type of ows. Through accurate computations, it is shown that, in the presence of small surface tension

Bigelow, Stephen

462

Direct synthesis of porous Mg(OH)2 nanoplates from natural brucite  

Science Journals Connector (OSTI)

Porous magnesium hydroxide nanoplates were synthesized directly from natural brucite in the presence of magnesium lactate through a simple hydrothermal process. Magnesium lactate may play a role of conveyer in transporting hydroxy groups from brucite to Mg(OH)2 nanoplates.

Weitao Gong; Di Wu; Zhen Cheng; Hongchang Pang; Yuan Lin; Guiling Ning

2013-01-01T23:59:59.000Z

463

A sharp interface reduction for multiphase transport in a porous fuel cell electrode  

Science Journals Connector (OSTI)

...the anode side to hydrate the dry inlet stream...evaporation at the two-phase boundary is an order...Van Nguyen2000Two-phase flow model of the...M 1941Capillary behavior in porous media...two-dimensional, two-phase, multicomponent...in water repellent sand. J. Hydrol. 231-232...

2006-01-01T23:59:59.000Z

464

Experimental study on the formation and dissociation conditions of methane hydrates in porous media  

E-Print Network (OSTI)

hydrates formed by methane gas and pure water in porous media. Methane gas hydrates were formed in a cell packed with 0.177-mm (0.007 in) diameter single sand (U.S. Sieve Series Designation Mesh No. 80) and 0.420-mm (0.017 in) diameter single sand (U...

Jung, Woodong

2012-06-07T23:59:59.000Z

465

Acoustic Properties of Porous Coatings for Hypersonic Boundary-Layer Control  

E-Print Network (OSTI)

Acoustic Properties of Porous Coatings for Hypersonic Boundary-Layer Control Guillaume A. Brès for hypersonic laminar flow control. The reflection coefficient, characterizing the ratio of the reflected wave of incidence, for coatings of different porosities, at various acoustic Reynolds numbers relevant to hypersonic

Dabiri, John O.

466

Effective thermal conductivity for anisotropic granular porous media using fractal concepts  

SciTech Connect

The use of granular porous media in chemical processes, thermal insulation, heat exchangers, and nuclear reactor fuel rods has led to the development of correlations for thermophysical properties, such as thermal conductivity. These correlations are essential in the prediction of heat and mass transfer involving porous media. Analytical correlations are derived for the effective thermal conductivity of anisotropic, Granular Porous Media (GPM). The correlations proposed, which can be apply in general to any porous media material, are used to determine the effective thermal conductivity of GPM that are formed by semi-cylindrical ice particles. Pictures of the cross-section of GPM provide digital data for measuring local fractal dimensions. Local fractal dimensions are used to determine an equivalent three-dimensional Representative Unit Cell (RUC) for the GPM considered. A simplified analysis of heat conduction at the RUC level provide an analytical expression for the effective heat transfer coefficient. Estimates for the effective thermal conductivity by the use of the models are discussed and compared with various models known in literature. Finally, results for anisotropic thermal conductivities, which are obtained by the use of fractal correlations, are discussed.

Sabau, A.S.; Tao, Y.X.; Liu, G.; Vidhuvalavan, G.

1997-07-01T23:59:59.000Z

467

Kaolinite and Lead in Saturated Porous Media: Facilitated and Impeded Transport  

E-Print Network (OSTI)

of contaminants in the media. Lead Pb is a toxic heavy metal commonly found in the en- vironment. Recent studies-facilitated contaminant transport in saturated porous media. A clay colloid kaolinite and a heavy-metal contaminant Pb models; Water treatment; Water pollution; Experimentation. Author keywords: Colloid; Colloid

Ma, Lena

468

MERLOT: a model for flow and heat transfer through porous media for high heat flux applications  

E-Print Network (OSTI)

MERLOT: a model for flow and heat transfer through porous media for high heat flux applications A Abstract Fusion power plant studies have found helium to be an attractive coolant based on its safety tend to provide modest heat transfer performance due to their inherently low heat capacity and heat

Raffray, A. René

469

Local Heating of Discrete Droplets Using Magnetic Porous Silicon-Based Photonic Crystals  

E-Print Network (OSTI)

of conventional microfluidic channel and heating systems. Introduction Much of the work on microfluidics to dateLocal Heating of Discrete Droplets Using Magnetic Porous Silicon-Based Photonic Crystals Ji-Ho Park and Technology (HarVard-MIT) and Department of Electrical Engineering and Computer Science, Massachusetts

Bhatia, Sangeeta

470

Optically Transparent Porous Medium for Nondestructive Studies of Microbial Biofilm Architecture and Transport Dynamics  

Science Journals Connector (OSTI)

...1998. Handbook of polymers. Wiley-Interscience...Busscher. 1999. Models for studying initial...Ever see a water flood? Oil Gas J. 59...A new colloidal model system to study long-range...colloids within a model porous medium. Biofilms...0 Culture Media 0 Polymers 9002-84-0 Polytetrafluoroethylene...

Andrew P. Leis; Sven Schlicher; Hilmar Franke; Martin Strathmann

2005-08-01T23:59:59.000Z

471

Porous Materials Prepared from Clays for the Upgrade of Landfill Gas  

Science Journals Connector (OSTI)

A Portuguese clay from soil deposits in Porto Santo (Madeira archipelago), previously characterized,(47) was used in the preparation of the porous PCH and PILC. ... For comparison purposes, MCM-41, a solid with well-defined mesopores, and a PILC material were used. ... (48) PILC was obtained from the natural clay. ...

Moisés L. Pinto; João Pires; João Rocha

2008-08-23T23:59:59.000Z

472

Preparation and characterization of porous silica xerogel film for low dielectric application  

E-Print Network (OSTI)

microelectronics precursors [2]. In particular, one of the porous SiO2 gels, aerogels, has extremely high por aerogel can be applied to IMD [3­5]. In our previous work, we obtained SiO2 aerogel thin film with good, an ambient drying method for the preparation of SiO2 aerogel film was studied and recently reported by Pra

Jo, Moon-Ho

473

Storage of Hydrogen, Methane, and Carbon Dioxide in Highly Porous Covalent Organic Frameworks for Clean Energy  

E-Print Network (OSTI)

, and carbon dioxide. Introduction Carbon dioxide emissions resulting from the burning of fossil fuels 20 metric tons of carbon dioxide per capita are released annually into the atmosphere.1a,b CarbonStorage of Hydrogen, Methane, and Carbon Dioxide in Highly Porous Covalent Organic Frameworks

Yaghi, Omar M.

474

Study of the simultaneous heat and mass transfer in two-dimensional porous media  

E-Print Network (OSTI)

is to illustrate the applications of the THEOREM derived above. Consider a one ? dimensional porous medium of L = 0. 5m at an initial temperature of T, and an initial moisture concentration of Cas~el (Left wall subjected to a step change in temperature...

Suh, Young Bae

1988-01-01T23:59:59.000Z

475

Optical and electrical properties of porous silicon impregnated with Congo Red dye  

Science Journals Connector (OSTI)

Incorporation of molecules into porous silicon (PS) matrix is of particular interest for potential utilization in hybrid organic-semiconductor devices. In this study the incorporation of Congo Red molecules inside luminescent PS layers was investigated. The resulting structures have been characterized by Fourier Transformer Infrared (FTIR) and photoluminescence (PL) techniques. Based on these characterizations the infiltration of dye molecules into the porous matrix has been proved. The recuperated PL signal was more important than that of porous silicon alone. A nonradiative excitation transfer due to dipolar interactions was evidenced from the effect of the CR concentration on the PL emission which was also confirmed by FTIR spectroscopy. It was found that the formed composite displays an efficient and stable PL. Preliminary characterizations of the electrical properties of the resulting nanocomposite structure have been also performed. The current–voltage (I–V) characteristics of CR-PS/p-Si were measured at the room temperature (300?K). To study the effect of illumination on CR-PS/p-Si composites the measurement has been performed in dark and under illumination at room temperature. The diode characteristics including zero-bias barrier height (?B0) ideality factor (n) and series resistance (Rs) were calculated at room temperature in dark and under illumination. The obtained results have shown that these characteristics are largely affected by illumination. The incorporation of dye molecules in porous silicon matrix enhanced photovoltaic properties of resulting structures.

2013-01-01T23:59:59.000Z

476

Porous yttria-stabilized zirconia ceramics with ultra-low thermal conductivity  

Science Journals Connector (OSTI)

Porous yttria-stabilized zirconia (ZrO2-8 mol% Y2O3, YSZ) ceramics with ultra-low thermal conductivity (as low as 0.06 W/mK) could be fabricated by tert-butyl alcohol...

LiangFa Hu; Chang-An Wang; Yong Huang

2010-06-01T23:59:59.000Z

477

Modeling evaporation from porous medium influenced by turbulent free flow Thomas Fetzer  

E-Print Network (OSTI)

toolbox freeflow (1p2c) direct numerical simulation Reynolds-averaged- Navier-Stokes (RANS) Stokes flow medium (2p2c) direct numerical simulation pore network modeling representative elementary volume (REV as a one-phase, two-component system (1p2c), the porous medium as a two-phase, two-component system (2p2c

Cirpka, Olaf Arie

478

Block Preconditioning for a Coupled Model of Transport with Sorption in Porous Media  

E-Print Network (OSTI)

Block Preconditioning for a Coupled Model of Transport with Sorption in Porous Media List consider a simplified model with one species undergoing a sorption reaction, given by a known equilibrium and D is the diffusion­ dispersion tensor. The sorption isotherm in equation (1) will be taken

Boyer, Edmond

479

MATHEMATICAL MODELING OF CHANNEL POROUS LAYER INTERFACES IN PEM FUEL CELLS  

E-Print Network (OSTI)

two types of PEM fuel cells: H2 PEM fuel cells (H2PEMFC) driven by gaseous hydrogen, and directMATHEMATICAL MODELING OF CHANNEL ­ POROUS LAYER INTERFACES IN PEM FUEL CELLS M. EHRHARDT, J, Germany ABSTRACT In proton exchange membrane (PEM) fuel cells, the transport of the fuel to the active

Ehrhardt, Matthias

480

Study of a numerical scheme for miscible two-phase flow in porous media  

E-Print Network (OSTI)

phase in the underground. In the framework of nuclear waste management, some gaseous hydrogen, produced by acid attack of metallic containers containing the nuclear waste, may flow within porous soils initially is small compared to the effect of dispersed velocities at the pore scale). The function S(q) denotes

Note: This page contains sample records for the topic "hard porous product" 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.
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481

Parameter Estimates for High-Level Nuclear Transport in Fractured Porous Media  

E-Print Network (OSTI)

accurate description of the transport and dispersion of nuclear contam- ination through a granitic medium with a standard model for the transport and dispersion of a nuclear chain in an unfractured, singleParameter Estimates for High-Level Nuclear Transport in Fractured Porous Media Jim Douglas, Jr. #3

Douglas Jr., Jim

482

Capillary condensation and interface structure of a model colloid-polymer mixture in a porous medium  

E-Print Network (OSTI)

¨sseldorf, Universita¨tsstra�e 1, 40225 Du¨sseldorf, Germany Matthias Schmidt Debye Institute, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands Hartmut Lo¨wen Institut fu¨r Theoretische Physik II, Heinrich, the study of adsorbates in porous media is also of great interest in applied fields ranging from industrial

Schmidt, Matthias

483

Neutron imaging of hydrogen-rich fluids in geomaterials and engineered porous media: A review  

E-Print Network (OSTI)

Neutron imaging of hydrogen-rich fluids in geomaterials and engineered porous media: A review E-rich fluids in both 2-dimensions (radiography) and 3-dimensions (tomography). Engineering standards 37831, United States c Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak

Perfect, Ed

484

A one-dimensional model of vertical gas plume migration through a heterogeneous porous medium  

E-Print Network (OSTI)

A one-dimensional model of vertical gas plume migration through a heterogeneous porous medium and consequent global warming. Ideally, the injected greenhouse gas stays in the injection zone for a geologic or inadvertently created conduits in the cap rock may result in a gas leakage from primary storage. Even

Patzek, Tadeusz W.

485

Theoretical study of gas heated in a porous material subjected to a concentrated solar radiation (*)  

E-Print Network (OSTI)

W solar furnace of Solar Energy Laboratory in Odeillo (France). Revue Phys. Appl. 15 (1980) 423-426 MARS423 Theoretical study of gas heated in a porous material subjected to a concentrated solar exposed to the solar radiation. These quantities may be expressed in any set consistent units. 1

Paris-Sud XI, Université de

486

Exploring electronic structure through high-resolution hard x-ray  

NLE Websites -- All DOE Office Websites (Extended Search)

Exploring electronic structure through high-resolution hard x-ray Exploring electronic structure through high-resolution hard x-ray spectroscopies Tuesday, July 23, 2013 - 11:00am SLAC, Conference Room 137-322 Presented by Dimosthenis Sokaras, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory Modern high brilliance beamlines coupled with recent advances in hard-x-ray optics are establishing high-resolution hard x-ray spectroscopies as a powerful analytical tool for routine electronic structure investigations. Their advantageous characteristics like the chemical sensitivity or the hard x-rays penetration depth, that permits the implementation of difficult sample environments, expand the applicability of the relevant studies to multidisciplinary scientific fields. Simultaneously, the experimental

487

Quantum Searches in a Hard 2SAT Ensemble  

E-Print Network (OSTI)

Using a recently constructed ensemble of hard 2SAT realizations, that has a unique ground-state we calculate for the quantized theory the median gap correlation length values $\\xi_{GAP}$ along the direction of the quantum adiabatic control parameter $\\lambda$. We use quantum annealing (QA) with transverse field and a linear time schedule in the adiabatic control parameter $\\lambda$. The gap correlation length diverges exponentially $\\xi_{\\rm GAP} \\propto {\\rm exp} [+r_{\\rm GAP}N]$ in the median with a rate constant $r_{\\rm GAP}=0.553(6)$, while the run time diverges exponentially $\\tau_{\\rm QA} \\propto {\\rm exp} [+r_{\\rm QA}N]$ with $r_{\\rm QA}=1.184(16)$. Simulated classical annealing (SA) exhibits a run time rate constant $r_{\\rm SA}=0.340(5)$ that is small and thus finds ground-states exponentially faster than QA. There are no quantum speedups in ground state searches on constant energy surfaces that have exponentially large volume. We also determine gap correlation length distribution functions $P(\\xi_{\\rm GAP})d\\xi_{\\rm GAP} \\approx W_k$ over the ensemble that at $N=18$ are close to Weibull functions $W_k$ with $k \\approx 1.2$ i.e., the problems show thin catastrophic tails in $\\xi_{\\rm GAP}$. The inferred success probability distribution functions of the quantum annealer turn out to be bimodal.

Neuhaus Thomas

2014-12-17T23:59:59.000Z

488

Isotropic-nematic phase behavior of length polydisperse hard rods  

E-Print Network (OSTI)

The isotropic-nematic phase behavior of length polydisperse hard rods with arbitrary length distributions is calculated. Within a numerical treatment of the polydisperse Onsager model using the Gaussian trial function Ansatz we determine the onset of isotropic-nematic phase separation, coming from a dilute isotropic phase and a dense nematic phase. We focus on parent systems whose lengths can be described by either a Schulz or a `fat-tailed' log-normal distribution with appropriate lower and upper cutoff lengths. In both cases, very strong fractionation effects are observed for parent polydispersities larger than roughly 50 %. In these regimes, the isotropic and nematic phases are completely dominated by respectively the shortest and the longest rods in the system. Moreover, for the log-normal case, we predict triphasic isotropic-nematic-nematic equilibria to occur above a certain threshold polydispersity. By investigating the properties of the coexisting phases across the coexistence region for a particular set of cutoff lengths we explicitly show that the region of stable triphasic equilibria does not extend up to very large parent polydispersities but closes off at a consolute point located not far above the threshold polydispersity. The experimental relevance of the phenomenon is discussed.

H. H. Wensink; G. J. Vroege

2003-04-18T23:59:59.000Z

489

THE SWIFT/BAT HARD X-RAY TRANSIENT MONITOR  

SciTech Connect

The Swift/Burst Alert Telescope (BAT) hard X-ray transient monitor provides near real-time coverage of the X-ray sky in the energy range 15-50 keV. The BAT observes 88% of the sky each day with a detection sensitivity of 5.3 mCrab for a full-day observation and a time resolution as fine as 64 s. The three main purposes of the monitor are (1) the discovery of new transient X-ray sources, (2) the detection of outbursts or other changes in the flux of known X-ray sources, and (3) the generation of light curves of more than 900 sources spanning over eight years. The primary interface for the BAT transient monitor is a public Web site. Between 2005 February 12 and 2013 April 30, 245 sources have been detected in the monitor, 146 of them persistent and 99 detected only in outburst. Among these sources, 17 were previously unknown and were discovered in the transient monitor. In this paper, we discuss the methodology and the data processing and filtering for the BAT transient monitor and review its sensitivity and exposure. We provide a summary of the source detections and classify them according to the variability of their light curves. Finally, we review all new BAT monitor discoveries. For the new sources that are previously unpublished, we present basic data analysis and interpretations.

Krimm, H. A.; Holland, S. T.; Corbet, R. H. D.; Pearlman, A. B.; Baumgartner, W. H.; Cummings, J. R. [Center for Research and Exploration in Space Science and Technology (CRESST) and NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Romano, P. [INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via U. La Malfa 153, I-90146 Palermo (Italy); Kennea, J. A. [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Bloom, J. S. [Department of Astronomy, University of California, Berkeley, Berkeley, CA 94720-3411 (United States); Barthelmy, S. D.; Gehrels, N.; Lien, A. Y.; Markwardt, C. B.; Ukwatta, T. N. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Palmer, D. M. [Los Alamos National Laboratory, B244, Los Alamos, NM 87545 (United States); Sakamoto, T. [Department of Physics and Mathematics, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara-shi, Kanagawa 252-5258 (Japan); Stamatikos, M. [Department of Physics and Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210 (United States)

2013-11-01T23:59:59.000Z

490

Free energy landscape of a dense hard-sphere system  

Science Journals Connector (OSTI)

The topography of the free energy landscape in phase space of a dense hard-sphere system characterized by a discretized free energy functional of the Ramakrishnan-Yussouff form is investigated numerically using a specially devised Monte Carlo procedure. We locate a considerable number of glassy local minima of the free energy and analyze the distributions of the free energy at a minimum and an appropriately defined phase-space “distance” between different minima. We find evidence for the existence of pairs of closely related glassy minima (“two-level systems”). We also investigate the way the system makes transitions as it moves from the basin of attraction of a minimum to that of another one after a start under nonequilibrium conditions. This allows us to determine the effective height of free energy barriers that separate a glassy minimum from the others. The dependence of the height of free energy barriers on the density is investigated in detail. The general appearance of the free energy landscape resembles that of a putting green: relatively deep minima separated by a fairly flat structure. We discuss the connection of our results with the Vogel-Fulcher law and relate our observations to other work on the glass transition.

Chandan Dasgupta and Oriol T. Valls

1999-03-01T23:59:59.000Z

491

Method and apparatus for micromachining using hard X-rays  

DOE Patents (OSTI)

An X-ray source such as a synchrotron which provides a significant spectral content of hard X-rays is used to expose relatively thick photoresist such that the portions of the photoresist at an exit surface receive at least a threshold dose sufficient to render the photoresist susceptible to a developer, while the entrance surface of the photoresist receives an exposure which does not exceed a power limit at which destructive disruption of the photoresist would occur. The X-ray beam is spectrally shaped to substantially eliminate lower energy photons while allowing a substantial flux of higher energy photons to pass through to the photoresist target. Filters and the substrate of the X-ray mask may be used to spectrally shape the X-ray beam. Machining of photoresists such as polymethylmethacrylate to micron tolerances may be obtained to depths of several centimeters, and multiple targets may be exposed simultaneously. The photoresist target may be rotated and/or translated in the beam to form solids of rotation and other complex three-dimensional structures. 21 figs.

Siddons, D.P.; Johnson, E.D.; Guckel, H.; Klein, J.L.

1997-10-21T23:59:59.000Z

492

Method and apparatus for micromachining using hard X-rays  

DOE Patents (OSTI)

An X-ray source such as a synchrotron which provides a significant spectral content of hard X-rays is used to expose relatively thick photoresist such that the portions of the photoresist at an exit surface receive at least a threshold dose sufficient to render the photoresist susceptible to a developer, while the entrance surface of the photoresist receives an exposure which does not exceed a power limit at which destructive disruption of the photoresist would occur. The X-ray beam is spectrally shaped to substantially eliminate lower energy photons while allowing a substantial flux of higher energy photons to pass through to the photoresist target. Filters and the substrate of the X-ray mask may be used to spectrally shape the X-ray beam. Machining of photoresists such as polymethylmethacrylate to micron tolerances may be obtained to depths of several centimeters, and multiple targets may be exposed simultaneously. The photoresist target may be rotated and/or translated in the beam to form solids of rotation and other complex three-dimensional structures.

Siddons, David Peter (Shoreham, NY); Johnson, Erik D. (Ridge, NY); Guckel, Henry (Madison, WI); Klein, Jonathan L. (Madison, WI)

1997-10-21T23:59:59.000Z

493

Study of microscopic structure of porous media - fine coal filter cakes  

SciTech Connect

The macroscopic properties of the porous media, e.g., permeability, capillary pressure, relative permeability, depend upon the microscopic structure of the porous medium. In the coal preparation plants, the filtration and dewatering rates of the fine coal filter cakes are important in determining the final moisture content. The microscopic structure of the porous coal filter cakes plays an important role in these operations. Moreover, the two phase flow through the porous medium can be explained in detail by considering its pore structure. Hence, the development of a technique for the micro-structural analysis of unconsolidated coal filter cakes is investigated. The technique developed is also applicable to many consolidated porous media like sandstones, rocks, etc. Optical methods were utilized to study the micro-structure of fine coal cakes. The investigation of -32 mesh Pittsburgh seam coal cakes reveals a non-uniform structure at low solid concentration of 0.33 kg coal/kg water. An increase in the solid concentration in the slurry produces a more uniform structure with an increase in the filtration and dewatering rates. It was found that coal filter cakes are incompressible over the range of 28 to 67 kPa applied vacuum. An important aspect of this work was to provide quantitative information about the presence of air bubbles in the coal filter cakes. These air bubbles are evolved from the aerated slurry and they reduce the filtration rates. A linear correlation between the particle and pore size distribution of -32 mesh Pittsburgh coal was found.

Kakwani, R.M.

1983-01-01T23:59:59.000Z

494

Program plan for the development of advanced synthetic-diamond drill bits for hard-rock drilling  

SciTech Connect

Eight companys have teamed with Sandia Labs to work on five projects as part of a cooperative effort to advance the state of the ar in synthetic-diamond drill bit design and manufacture. DBS (a Baroid Company), Dennis Tool Company, Hughes Christensen Company, Maurer Engineering, Megadiamond, Security Diamond Products, Slimdril International, and Smith International. Objective of each project is to develop advanced bit technology that results in new commercial products with longer bit life and higher penetration rates in hard formations. Each project explores a different approach to synthetic-diamond cutter and bit design and, consequently, uses different approaches to developing the technology. Each of these approaches builds or the respective companies` capabilities and current product interests. Sandia`s role is to assure integration of the individual projects into a coherent program and tc provide unique testing and analytical capabilities where needed. One additional company, Amoco Production Research, will provide synthetic-diamond drill bit research expertise and field testing services for each project in the program.

Glowka, D.A.; Schafer, D.M.

1993-09-01T23:59:59.000Z

495

3D Field-Scale Reactive Transport Modeling of In Situ Immobilization of Uranium in Structured Porous Media via Biostimulation  

SciTech Connect

A several-month-long ethanol injection experiment is being conducted to study the impacts of porous media structure (i.e., heterogeneity existing at multiple scales) on the effectiveness of metal/radionuclide bioremediation in a highly heterogeneous unconfined aquifer near Oak Ridge, TN, USA. We have constructed a 3D field-scale groundwater flow and multicomponent reactive transport model to simulate the experimental observations. The model incorporates a suite of abiotic reactions and microbially-mediated redox reactions for multiple terminal electron accepting processes (TEAPs) including soluble oxygen, nitrate, U(VI) and sulfate and solid-phase electron acceptors. Different biomass populations are considered in the model. Growth of these populations is derived from the bioenergetics-based approach in which the partitioning of electron flow between energy generation and cell biomass production is dependent on the free energy of the corresponding TEAP. TEAP reaction rates were free energy constrained. The TEAP model and reaction system have been formulated and used to simulate laboratory batch experimental observations. We conducted the field-scale simulation starting with the reaction system and parameters obtained from the batch experiment and hydrologic parameters estimated from the results of pumping tests, water level monitoring and model interpretation of a tracer test conducted in August 2004. Reaction parameters were investigated to compare simulation results and field experiment observations.

Fang, Yilin; Scheibe, Timothy D.; Roden, Eirc E.; Kamolpornwijit, Wiwat; Brooks, Scott C.

2006-09-12T23:59:59.000Z

496

Effect of palladium addition on catalytic activity in steam methane reforming over Ni-YSZ porous membrane  

Science Journals Connector (OSTI)

Abstract This study investigated the additive effects of palladium, and the deposition method of palladium on Ni-YSZ porous membrane in steam methane reforming. Pd–Ni-YSZ porous membrane prepared by the wet impregnation method showed superior catalytic activity, where the methane conversion reached 94.6% at 650 °C, with H2 yield above 3.9. The palladium particles were well dispersed, and the Pd–Ni-YSZ porous membrane exhibited high adsorption capacity for water. The addition of palladium and the deposition method of palladium are very important for the steam methane reforming reaction.

Sang Moon Lee; Sung Chang Hong

2014-01-01T23:59:59.000Z

497

Wave packet autocorrelation functions for quantum hard-disk and hard-sphere billiards in the high-energy, diffraction regime  

E-Print Network (OSTI)

We consider the time evolution of a wave packet representing a quantum particle moving in a geometrically open billiard that consists of a number of fixed hard-disk or hard-sphere scatterers. Using the technique of multiple collision expansions we provide a first-principle analytical calculation of the time-dependent autocorrelation function for the wave packet in the high-energy diffraction regime, in which the particle's de Broglie wave length, while being small compared to the size of the scatterers, is large enough to prevent the formation of geometric shadow over distances of the order of the particle's free flight path. The hard-disk or hard-sphere scattering system must be sufficiently dilute in order for this high-energy diffraction regime to be achievable. Apart from the overall exponential decay, the autocorrelation function exhibits a generally complicated sequence of relatively strong peaks corresponding to partial revivals of the wave packet. Both the exponential decay (or escape) rate and the revival peak structure are predominantly determined by the underlying classical dynamics. A relation between the escape rate, and the Lyapunov exponents and Kolmogorov-Sinai entropy of the counterpart classical system, previously known for hard-disk billiards, is strengthened by generalization to three spatial dimensions. The results of the quantum mechanical calculation of the time-dependent autocorrelation function agree with predictions of the semiclassical periodic orbit theory.

Arseni Goussev; J. R. Dorfman

2006-07-18T23:59:59.000Z

498

Nanopatterned ferroelectrics for ultrahigh density rad-hard nonvolatile memories.  

SciTech Connect

Radiation hard nonvolatile random access memory (NVRAM) is a crucial component for DOE and DOD surveillance and defense applications. NVRAMs based upon ferroelectric materials (also known as FERAMs) are proven to work in radiation-rich environments and inherently require less power than many other NVRAM technologies. However, fabrication and integration challenges have led to state-of-the-art FERAMs still being fabricated using a 130nm process while competing phase-change memory (PRAM) has been demonstrated with a 20nm process. Use of block copolymer lithography is a promising approach to patterning at the sub-32nm scale, but is currently limited to self-assembly directly on Si or SiO{sub 2} layers. Successful integration of ferroelectrics with discrete and addressable features of {approx}15-20nm would represent a 100-fold improvement in areal memory density and would enable more highly integrated electronic devices required for systems advances. Towards this end, we have developed a technique that allows us to carry out block copolymer self-assembly directly on a huge variety of different materials and have investigated the fabrication, integration, and characterization of electroceramic materials - primarily focused on solution-derived ferroelectrics - with discrete features of {approx}20nm and below. Significant challenges remain before such techniques will be capable of fabricating fully integrated NVRAM devices, but the tools developed for this effort are already finding broader use. This report introduces the nanopatterned NVRAM device concept as a mechanism for motivating the subsequent studies, but the bulk of the document will focus on the platform and technology development.

Brennecka, Geoffrey L.; Stevens, Jeffrey; Scrymgeour, David; Gin, Aaron V.; Tuttle, Bruce Andrew

2010-09-01T23:59:59.000Z

499

EFFECT OF ENDOSPERM HARDNESS ON AN ETHANOL PROCESS USING A GRANULAR STARCH HYDROLYZING ENZYME  

SciTech Connect

Granular starch hydrolyzing enzymes (GSHE) can hydrolyze starch at low temperature (32°C). The dry grind process using GSHE (GSH process) has fewer unit operations and no changes in process conditions (pH 4.0 and 32°C) compared to the conventional process because it dispenses with the cooking and liquefaction step. In this study, the effects of endosperm hardness, protease, urea, and GSHE levels on GSH process were evaluated. Ground corn, soft endosperm, and hard endosperm were processed using two GSHE levels (0.1 and 0.4 mL per 100 g ground material) and four treatments of protease and urea addition. Soft and hard endosperm materials were obtained by grinding and sifting flaking grits from a dry milling pilot plant; classifications were confirmed using scanning electron microscopy. During 72 h of simultaneous granular starch hydrolysis and fermentation (GSHF), ethanol and glucose profiles were determined using HPLC. Soft endosperm resulted in higher final ethanol concentrations compared to ground corn or hard endosperm. Addition of urea increased final ethanol concentrations for soft and hard endosperm. Protease addition increased ethanol concentrations and fermentation rates for soft endosperm, hard endosperm, and ground corn. The effect of protease addition on ethanol concentrations and fermentation rates was most predominant for soft endosperm, less for hard endosperm, and least for ground corn. Samples (soft endosperm, hard endosperm, or corn) with protease resulted in higher (1.0% to 10.5% v/v) ethanol concentration compared to samples with urea. The GSH process with protease requires little or no urea addition. For fermentation of soft endosperm, GSHE dose can be reduced. Due to nutrients (lipids, minerals, and soluble proteins) present in corn that enhance yeast growth, ground corn fermented faster at the beginning than hard and soft endosperm.

P. Wang; W. Liu, D. B; Johnston, K. D; Rausch, S. J; Schmidt, M. E; Tumbleson, V. Singh

2010-01-01T23:59:59.000Z

500

RMOTC - Production  

NLE Websites -- All DOE Office Websites (Extended Search)

Production Production RMOTC Pumpjack in action During the process of the sale of NPR-3, RMOTC will focus on maximizing the value of the NPR-3 site and will continue with its Production Optimization Projects. NPR-3 includes 9,481 acres with more than 400 oil-producing wells. Current oil production is at approximately 240 barrels of oil per day. In July 2013, RMOTC began working on a number of Production Optimization Projects within the NPR-3 field, with the goal to optimize and improve flow and efficiency. Production Optimization Projects include repairing and replacing existing infrastructure with new infrastructure in order to optimize current wells and bring additional wells online. These Production Optimization Projects will continue throughout 2013 and are focused on improving current production and creating revenue for the America tax payer.