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1

Massive Cement Pour into Hanford Site Nuclear Facility Underway: Recovery  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office0-72.pdfGeorgeDoesn't HappenLow-CostManufacturingMarginalMarket|MassachusettsAct

2

Successful Alternatives to Conventional Cement Designs in the Williston Basin  

SciTech Connect (OSTI)

Since mid-1981, 36 wells have been cemented in the Williston Basin with a cementing system diametrically opposed to conventional cementing designs used for bonding across massive salt members. Since implementation, along with the use of relaxed invert emulsion oil mud, not one casing problem has arisen in the wells where these systems were used.

Bryant, G.A.

1984-05-01T23:59:59.000Z

3

Nano-ChemoMechanical assessment of Rice Husk Ash cement by wavelength dispersive spectroscopy and nanoindentation  

E-Print Network [OSTI]

Cement global production stands at 3 Giga tons making concrete the most consumed structural mateial worldwide. This massively produced material comes with a heavy environmental footprint rendering the cement industry ...

Abuhaikal, Muhannad (Muhannad A. R.)

2011-01-01T23:59:59.000Z

4

Massive Gravity  

E-Print Network [OSTI]

We review recent progress in massive gravity. We start by showing how different theories of massive gravity emerge from a higher-dimensional theory of general relativity, leading to the Dvali-Gabadadze-Porrati model, cascading gravity and ghost-free massive gravity. We then explore their theoretical and phenomenological consistency, proving the absence of Boulware-Deser ghosts and reviewing the Vainshtein mechanism and the cosmological solutions in these models. Finally we present alternative and related models of massive gravity such as new massive gravity, Lorentz-violating massive gravity and non-local massive gravity.

Claudia de Rham

2014-03-14T23:59:59.000Z

5

Problems in squeeze cementing  

SciTech Connect (OSTI)

For the past half century, work has been carried out to improve squeeze cementing. During the course of time, new techniques, equipment, cement and cement additives were introduced. Work is still underway to improve squeeze cementing. Basic concept of squeeze cementing, understanding the problems, planning for a squeeze job and then later testing of the job help in achieving the goal. Solutions were offered to some common problems, whereas many regional problems need time to time study and effort. Squeezing long perforations in highly permeable sand has always been a problem, for which some techniques were presented.

Toor, I.A.

1983-03-01T23:59:59.000Z

6

Alex Benson Cement Plants  

E-Print Network [OSTI]

with steel balls which grind mix into a fine powder -> Final Cement Product Associated Air Pollution: o From health effects Relative News; o "EPA Clamps down on Cement Plant Pollution" http.4 million dollars for violating the Clean Air Act and 2 million dollars for pollution controls #12

Toohey, Darin W.

7

Thermodynamics and cement science  

SciTech Connect (OSTI)

Thermodynamics applied to cement science has proved to be very valuable. One of the most striking findings has been the extent to which the hydrate phases, with one conspicuous exception, achieve equilibrium. The important exception is the persistence of amorphous C-S-H which is metastable with respect to crystalline calcium silicate hydrates. Nevertheless C-S-H can be included in the scope of calculations. As a consequence, from comparison of calculation and experiment, it appears that kinetics is not necessarily an insuperable barrier to engineering the phase composition of a hydrated Portland cement. Also the sensitivity of the mineralogy of the AFm and AFt phase compositions to the presence of calcite and to temperature has been reported. This knowledge gives a powerful incentive to develop links between the mineralogy and engineering properties of hydrated cement paste and, of course, anticipates improvements in its performance leading to decreasing the environmental impacts of cement production.

Damidot, D., E-mail: damidot@ensm-douai.fr [Universite Lille Nord de France (France); EM Douai, LGCgE-MPE-GCE, Douai (France); Lothenbach, B. [Empa, Lab. Concrete and Construction Chemistry, Duebendorf (Switzerland); Herfort, D. [Cementir Holding (Denmark); Glasser, F.P. [Chemistry Department, University of Aberdeen, Aberdeen (United Kingdom)

2011-07-15T23:59:59.000Z

8

Full-scale tests of sulfur polymer cement and non-radioactive waste in heated and unheated prototypical containers  

SciTech Connect (OSTI)

Sulfur polymer cement has been demonstrated to be superior to portland cement in the stabilization of numerous troublesome low- level radioactive wastes, notably mixed waste fly ash, which contains heavy metals. EG G Idaho, Inc. conducted full-scale, waste-stabilization tests with a mixture of sulfur polymer cement and nonradioactive incinerator ash poured over simulated steel and ash wastes. The container used to contain the simulated waste for the pour was a thin-walled, rectangular, steel container with no appendages. The variable in the tests was that one container and its contents were at 65{degree}F (18{degree}C) at the beginning of the pour, while the other was preheated to 275{degree}F (135{degree}C) and was insulated before the pour. The primary goal was to determine the procedures and equipment deemed operationally acceptable and capable of providing the best probability of passing the only remaining governmental test for sulfur polymer cement, the Nuclear Regulatory Commission's full-scale test. The secondary goal was to analyze the ability of the molten cement and ash mixture to fill different size pipes and thus eliminate voids in the resultant 24 ft{sup 3} monolith.

Darnell, G.R.; Aldrich, W.C.; Logan, J.A.

1992-02-01T23:59:59.000Z

9

Full-scale tests of sulfur polymer cement and non-radioactive waste in heated and unheated prototypical containers  

SciTech Connect (OSTI)

Sulfur polymer cement has been demonstrated to be superior to portland cement in the stabilization of numerous troublesome low- level radioactive wastes, notably mixed waste fly ash, which contains heavy metals. EG&G Idaho, Inc. conducted full-scale, waste-stabilization tests with a mixture of sulfur polymer cement and nonradioactive incinerator ash poured over simulated steel and ash wastes. The container used to contain the simulated waste for the pour was a thin-walled, rectangular, steel container with no appendages. The variable in the tests was that one container and its contents were at 65{degree}F (18{degree}C) at the beginning of the pour, while the other was preheated to 275{degree}F (135{degree}C) and was insulated before the pour. The primary goal was to determine the procedures and equipment deemed operationally acceptable and capable of providing the best probability of passing the only remaining governmental test for sulfur polymer cement, the Nuclear Regulatory Commission`s full-scale test. The secondary goal was to analyze the ability of the molten cement and ash mixture to fill different size pipes and thus eliminate voids in the resultant 24 ft{sup 3} monolith.

Darnell, G.R.; Aldrich, W.C.; Logan, J.A.

1992-02-01T23:59:59.000Z

10

ULTRA-LIGHTWEIGHT CEMENT  

SciTech Connect (OSTI)

The objective of this project is to develop an improved ultra-lightweight cement using ultra-lightweight hollow glass spheres (ULHS). Work reported herein addresses tasks performed in the fourth quarter as well as the other three quarters of the past year. The subjects that were covered in previous reports and that are also discussed in this report include: Analysis of field laboratory data of active cement applications from three oil-well service companies; Preliminary findings from a literature review focusing on problems associated with ultra-lightweight cements; Summary of pertinent information from Russian ultra-lightweight cement literature review; and Comparison of compressive strengths of ULHS systems using ultrasonic and crush methods Results reported from the fourth quarter include laboratory testing of ULHS systems along with other lightweight cement systems--foamed and sodium silicate slurries. These comparison studies were completed for two different densities (10.0 and 11.5 lb/gal) and three different field application scenarios. Additional testing included the mechanical properties of ULHS systems and other lightweight systems. Studies were also performed to examine the effect that circulation by centrifugal pump during mixing has on breakage of ULHS.

Fred Sabins

2001-10-23T23:59:59.000Z

11

High temperature lightweight foamed cements  

DOE Patents [OSTI]

Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed. 3 figs.

Sugama, Toshifumi.

1989-10-03T23:59:59.000Z

12

High temperature lightweight foamed cements  

DOE Patents [OSTI]

Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed.

Sugama, Toshifumi (Mastic Beach, NY)

1989-01-01T23:59:59.000Z

13

Thermal Shock-resistant Cement  

SciTech Connect (OSTI)

We studied the effectiveness of sodium silicate-activated Class F fly ash in improving the thermal shock resistance and in extending the onset of hydration of Secar #80 refractory cement. When the dry mix cement, consisting of Secar #80, Class F fly ash, and sodium silicate, came in contact with water, NaOH derived from the dissolution of sodium silicate preferentially reacted with Class F fly ash, rather than the #80, to dissociate silicate anions from Class F fly ash. Then, these dissociated silicate ions delayed significantly the hydration of #80 possessing a rapid setting behavior. We undertook a multiple heating -water cooling quenching-cycle test to evaluate the cement’s resistance to thermal shock. In one cycle, we heated the 200 and #61616;C-autoclaved cement at 500 and #61616;C for 24 hours, and then the heated cement was rapidly immersed in water at 25 and #61616;C. This cycle was repeated five times. The phase composition of the autoclaved #80/Class F fly ash blend cements comprised four crystalline hydration products, boehmite, katoite, hydrogrossular, and hydroxysodalite, responsible for strengthening cement. After a test of 5-cycle heat-water quenching, we observed three crystalline phase-transformations in this autoclaved cement: boehmite and #61614; and #61543;-Al2O3, katoite and #61614; calcite, and hydroxysodalite and #61614; carbonated sodalite. Among those, the hydroxysodalite and #61614; carbonated sodalite transformation not only played a pivotal role in densifying the cementitious structure and in sustaining the original compressive strength developed after autoclaving, but also offered an improved resistance of the #80 cement to thermal shock. In contrast, autoclaved Class G well cement with and without Class F fly ash and quartz flour failed this cycle test, generating multiple cracks in the cement. The major reason for such impairment was the hydration of lime derived from the dehydroxylation of portlandite formed in the autoclaved cement, causing its volume to expand.

Sugama T.; Pyatina, T.; Gill, S.

2012-02-01T23:59:59.000Z

14

Massive Hopfions  

E-Print Network [OSTI]

The Skyrme-Faddeev model is a (3+1)-dimensional model which has knotted, string-like, soliton solutions. In this paper we investigate a Skyrme-Faddeev model with an SO(3) symmetry breaking potential. We then rescale this model and take the mass to infinity. This infinite mass model is found to have compact knotted solutions. In all of the investigated massive models we find similar charged solutions as in the usual, m=0, model. We also find that their energies follow a similar power growth as the m=0 model.

David Foster

2010-12-12T23:59:59.000Z

15

Increasing Energy Efficiency and Reducing Emissions from China's Cement Kilns: Audit Report of Two Cement Plants in Shandong Province, China  

E-Print Network [OSTI]

and a vertical shaft kiln at another cement manufacturingrotary kiln or vertical shaft kiln in a cement plant. Baseda vertical shaft kiln (VSK) at another cement manufacturing

Price, Lynn

2013-01-01T23:59:59.000Z

16

Guidebook for Using the Tool BEST Cement: Benchmarking and Energy Savings Tool for the Cement Industry  

E-Print Network [OSTI]

the small cement plants, earthen vertical kiln (and hollowcement plant in North China utilizing vertical shaft kilnsCement Industry Technical Conference: 75- Replacing Vertical Shaft Kilns

Galitsky, Christina

2009-01-01T23:59:59.000Z

17

MOUVEMENTS DE MARKOV POUR DES TRESSES QUASIPOSITIVES  

E-Print Network [OSTI]

1, . . . , m-1 et r´elations [j, k] = 1 pour |k - j| > 1 et jkj = kjk pour |k - j| = 1. Une tresse b

Orevkov, Stepan

18

Cement advanced furnace and process  

SciTech Connect (OSTI)

This patent describes a suspension shaft furnace for producing discrete cement clinkers from discrete pellets of cement-forming batch materials which are gravity-migrated therethrough. It comprises a vertical furnace housing enclosing a top pellet-feeding and preheating zone comprising an elongate vertical shaft section opening into an intermediate fluidized bed section comprising fuel inlet conduits, an air-permeable clinker-impermeable support; a lower clinker-cooling section beneath the fluidized bed section; clinker-discharge means communicating between the fluidized bed section and the cooling section and air inlet means.

Litka, A.F.; Cohen, S.M.

1992-06-02T23:59:59.000Z

19

ADVANCED CEMENTS FOR GEOTHERMAL WELLS  

SciTech Connect (OSTI)

Using the conventional well cements consisting of the calcium silicate hydrates (CaO-SiO{sub 2}-H{sub 2}O system) and calcium aluminum silicate hydrates (CaO-Al{sub 2}O{sub 3}-SiO{sub 2}-H{sub 2}O system) for the integrity of geothermal wells, the serious concern confronting the cementing industries was their poor performance in mechanically supporting the metallic well casing pipes and in mitigating the pipe's corrosion in very harsh geothermal reservoirs. These difficulties are particularly acute in two geological regions: One is the deep hot downhole area ({approx} 1700 m depth at temperatures of {approx} 320 C) that contains hyper saline water with high concentrations of CO{sub 2} (> 40,000 ppm) in conjunction with {approx} 100 ppm H{sub 2}S at a mild acid of pH {approx} 5.0; the other is the upper well region between the well's surface and {approx} 1000 m depth at temperatures up to 200 C. The specific environment of the latter region is characterized by highly concentrated H{sub 2}SO{sub 4} (pH < 1.5) brine containing at least 5000 ppm CO{sub 2}. When these conventional cements are emplaced in these harsh environments, their major shortcoming is their susceptibility to reactions with hot CO{sub 2} and H{sub 2}SO4, thereby causing their deterioration brought about by CO{sub 2}-catalyzed carbonation and acid-initiated erosion. Such degradation not only reduced rapidly the strength of cements, lowering the mechanical support of casing pipes, but also increased the extent of permeability of the brine through the cement layer, promoting the rate of the pipe's corrosion. Severely carbonated and acid eroded cements often impaired the integrity of a well in less than one year; in the worst cases, casings have collapsed within three months, leading to the need for costly and time-consuming repairs or redrilling operations. These were the reasons why the geothermal well drilling and cementing industries were concerned about using conventional well cements, and further their deterioration was a major impediment in expediting the development of geothermal energy resources.

SUGAMA,T.

2007-01-01T23:59:59.000Z

20

Cement design key to subsalt success  

SciTech Connect (OSTI)

Failures in casing set across salt formations have cost the petroleum industry billions of dollars. One of the most effective weapons for halting casing damage in salt formations is a competent cement sheath across the whole salt zone formation. Good cement jobs are at least as important as casing design. Choice of cementing recipe and practice can ensure a lasting cementation and is a function of the formation, its inclusions and its boundaries. The paper discusses the gauge hole, salt creep, and well casing and cementing.

NONE

1996-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

High temperature synthetic cement retarder  

SciTech Connect (OSTI)

A synthetic cement retarder which provides excellent retardation and compressive strength development has been synthesized. The response properties and temperature ranges of the synthetic retarder far exceed those of commonly used retarders such as lignosulfonates. The chemical nature of the new retarder is discussed and compared to another synthetic retarder.

Eoff, L.S.; Buster, D.

1995-11-01T23:59:59.000Z

22

Process for cementing geothermal wells  

DOE Patents [OSTI]

A pumpable slurry of coal-filled furfuryl alcohol, furfural, and/or a low molecular weight mono- or copolymer thereof containing, preferably, a catalytic amount of a soluble acid catalyst is used to cement a casing in a geothermal well.

Eilers, Louis H. (Inola, OK)

1985-01-01T23:59:59.000Z

23

CONSTRUCTION-GRADE CEMENT PRODUCTION FROM CONTAMINATED SEDIMENTS USING  

E-Print Network [OSTI]

1 CONSTRUCTION-GRADE CEMENT PRODUCTION FROM CONTAMINATED SEDIMENTS USING CEMENT-LOCKTM TECHNOLOGY A manufacturing technology for producing construction-grade cements from a wide variety of contaminated waste cementitious properties that allow it to be transformed into construction-grade cement. The Cement

Brookhaven National Laboratory

24

HYDRAULIC CEMENT PREPARATION FROM LURGI SPENT SHALE  

SciTech Connect (OSTI)

Low cost material is needed for grouting abandoned retorts. Experimental work has shown that a hydraulic cement can be produced from Lurgi spent shale by mixing it in a 1:1 weight ratio with limestone and heating one hour at 1000°C. With 5% added gypsum, strengths up to 25.8 MPa are obtained. This cement could make an economical addition up to about 10% to spent shale grout mixes, or be used in ordinary cement applications.

Mehta, P.K.; Persoff, P.; Fox, J.P.

1980-06-01T23:59:59.000Z

25

INVESTIGATIONS ON HYDRAULIC CEMENTS FROM SPENT OIL SHALE  

E-Print Network [OSTI]

CEMENTS FROM SPENT OIL SHALE P.K. Mehta and P. Persoff AprilCement Manufacture from Oil Shale, U.S. Patent 2,904,445,CEMENTS FROM SPENT OIL SHALE P, K, Mehta Civil Engineering

Mehta, P.K.

2012-01-01T23:59:59.000Z

26

Relationship Between Engineering Properties, Mineralogy, and Microstructure in Cement-Based Hydroceramic Materials Cured at  

E-Print Network [OSTI]

. I. Introduction CEMENT is universally used in the construction of oil and geothermal wells. Cement

Bentz, Dale P.

27

asbestos cement workers: Topics by E-print Network  

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

early stage hydration of different classes of oilwell cement Bentz, Dale P. 152 NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration Engineering Websites Summary: NISTIR...

28

ash cement concrete: Topics by E-print Network  

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

early stage hydration of different classes of oilwell cement Bentz, Dale P. 410 NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration Engineering Websites Summary: NISTIR...

29

ash substituted cements: Topics by E-print Network  

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

early stage hydration of different classes of oilwell cement Bentz, Dale P. 199 NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration Engineering Websites Summary: NISTIR...

30

asbestos cement dust: Topics by E-print Network  

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

early stage hydration of different classes of oilwell cement Bentz, Dale P. 278 NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration Engineering Websites Summary: NISTIR...

31

african portland cement: Topics by E-print Network  

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

present in hardened cement blends in the long term Sheffield, University of 337 NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration Engineering Websites Summary: NISTIR...

32

Multifunctional Corrosion-resistant Foamed Well Cement Composites...  

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

Multifunctional Corrosion-resistant Foamed Well Cement Composites Multifunctional Corrosion-resistant Foamed Well Cement Composites Multifunctional Corrosion-resistant Foamed Well...

33

Energy Efficiency Improvement Opportunities for the Cement Industry  

E-Print Network [OSTI]

flash distillation waste heat power generation demonstrationAdvanced Concepts of Waste Heat Recovery in Cement PlantsCement Ltd. also installed waste heat recovery equipment on

Worrell, Ernst

2008-01-01T23:59:59.000Z

34

Fracture model for cemented aggregates  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

A mechanisms-based fracture model applicable to a broad class of cemented aggregates and, among them, plastic-bonded explosive (PBX) composites, is presented. The model is calibrated for PBX 9502 using the available experimental data under uniaxial compression and tension gathered at various strain rates and temperatures. We show that the model correctly captures inelastic stress-strain responses prior to the load peak and it predicts the post-critical macro-fracture processes, which result from the growth and coalescence of micro-cracks. In our approach, the fracture zone is embedded into elastic matrix and effectively weakens the material's strength along the plane of the dominant fracture.

Zubelewicz, Aleksander; Thompson, Darla G.; Ostoja-Starzewski, Martin; Ionita, Axinte; Shunk, Devin; Lewis, Matthew W.; Lawson, Joe C.; Kale, Sohan; Koric, Seid

2013-01-01T23:59:59.000Z

35

Phosphate-bonded calcium aluminate cements  

DOE Patents [OSTI]

A method is described for making a rapid-setting phosphate-bonded cementitious material. A powdered aluminous cement is mixed with an aqueous solution of ammonium phosphate. The mixture is allowed to set to form an amorphous cementitious material which also may be hydrothermally treated at a temperature of from about 120 C to about 300 C to form a crystal-containing phosphate-bonded material. Also described are the cementitious products of this method and the cement composition which includes aluminous cement and ammonium polyphosphate. 10 figures.

Sugama, T.

1993-09-21T23:59:59.000Z

36

Guidebook for Using the Tool BEST Cement: Benchmarking and Energy Savings Tool for the Cement Industry  

E-Print Network [OSTI]

Advanced Concepts of Waste Heat Recovery in Cement Plantsquantities of low grade waste heat from the kilns or clinkerthere is significant effect of waste heat recovery on dioxin

Galitsky, Christina

2009-01-01T23:59:59.000Z

37

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

obsolete vertical shaft kiln (VSK) cement plants, with theobsolete vertical shaft kiln (VSK) cement plants, with theobsolete vertical shaft kiln (VSK) cement plants, with the

Price, Lynn

2010-01-01T23:59:59.000Z

38

Resummation of Massive Gravity  

SciTech Connect (OSTI)

We construct four-dimensional covariant nonlinear theories of massive gravity which are ghost-free in the decoupling limit to all orders. These theories resume explicitly all the nonlinear terms of an effective field theory of massive gravity. We show that away from the decoupling limit the Hamiltonian constraint is maintained at least up to and including quartic order in nonlinearities, hence excluding the possibility of the Boulware-Deser ghost up to this order. We also show that the same remains true to all orders in a similar toy model.

Rham, Claudia de [Department de Physique Theorique, Universite de Geneve, 24 Quai E. Ansermet, CH-1211 Geneve (Switzerland); Gabadadze, Gregory [Center for Cosmology and Particle Physics, Department of Physics, New York University, New York 10003 (United States); Tolley, Andrew J. [Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106 (United States)

2011-06-10T23:59:59.000Z

39

Supply chain management in the cement industry  

E-Print Network [OSTI]

Traditionally supply chain management has played an operational role within cement and mineral extraction commodity companies. Recently, cost reduction projects have brought supply chain management into the limelight. In ...

Agudelo, Isabel

2009-01-01T23:59:59.000Z

40

A nanochemomechanical investigation of carbonated cement paste  

E-Print Network [OSTI]

Concrete, and in particular its principal component, cement paste, has an interesting relation with carbon dioxide. Concrete is a carbon dioxide generator-- it is estimated that 5-10% of atmospheric CO? comes from this ...

Vanzo, James (James F.)

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

HYDRAULIC CEMENT PREPARATION FROM LURGI SPENT SHALE  

E-Print Network [OSTI]

cement from spent oil shale," Vol. 10, No. 4, p. 54S,Colorado's primary oil shale resource for vertical modifiedSimulated effects of oil-shale development on the hydrology

Mehta, P.K.

2013-01-01T23:59:59.000Z

42

HYDRAULIC CEMENT PREPARATION FROM LURGI SPENT SHALE  

E-Print Network [OSTI]

hydraulic cement from spent oil shale," Vol. 10, No. 4, p.J. W. , "Colorado's primary oil shale resource for verticalSimulated effects of oil-shale development on the hydrology

Mehta, P.K.

2013-01-01T23:59:59.000Z

43

Wearability of Portland Cement Concrete Pavement Finishes  

E-Print Network [OSTI]

Major Subject: Civil Engineering NEARABILITY OF PORTLAND CENENT CONCRETE PAPFNENT FIVISNFS A Thesis by Nilliam Rem NcKeen Approved as to style and content by: (Chairman of Committ e) (Nember) August 1971 ABSTRACT Hearabil'tv of Portland Cement... portland cement, and an air entrainment admixture. Standard laboratory tests were performed on all aggregates to determine their properties. iv The test specimens were molded in a controlled environmental room and the anpropriate surface finish (burlap...

McKeen, William Rew

1971-01-01T23:59:59.000Z

44

Supertwistors and massive particles  

SciTech Connect (OSTI)

In the (super)twistor formulation of massless (super)particle mechanics, the mass-shell constraint is replaced by a “spin-shell” constraint from which the spin content can be read off. We extend this formalism to massive (super)particles (with N-extended space–time supersymmetry) in three and four space–time dimensions, explaining how the spin-shell constraints are related to spin, and we use it to prove equivalence of the massive N=1 and BPS-saturated N=2 superparticle actions. We also find the supertwistor form of the action for “spinning particles” with N-extended worldline supersymmetry, massless in four dimensions and massive in three dimensions, and we show how this simplifies special features of the N=2 case. -- Highlights: •Spin-shell constraints are related to Poincaré Casimirs. •Twistor form of 4D spinning particle for spin N/2. •Twistor proof of scalar/antisymmetric tensor equivalence for 4D spin 0. •Twistor form of 3D particle with arbitrary spin. •Proof of equivalence of N=1 and N=2 BPS massive 4D superparticles.

Mezincescu, Luca, E-mail: mezincescu@server.physics.miami.edu [Department of Physics, University of Miami, Coral Gables, FL 33124 (United States); Routh, Alasdair J., E-mail: a.j.routh@damtp.cam.ac.uk [DAMTP, CMS, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Townsend, Paul K., E-mail: p.k.townsend@damtp.cam.ac.uk [DAMTP, CMS, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)

2014-07-15T23:59:59.000Z

45

Une architecture oriente service Web pour la constitution de mini-cubes SOLAP pour  

E-Print Network [OSTI]

mobile com- puting, Web service, service-oriented architecture. Revue internationale de géomatique ­ XUne architecture orientée service Web pour la constitution de mini-cubes SOLAP pour clients mobiles sur les architectures orientées services et les technologies des services Web, pour adapter les cubes

46

Alternative Fuel for Portland Cement Processing  

SciTech Connect (OSTI)

The production of cement involves a combination of numerous raw materials, strictly monitored system processes, and temperatures on the order of 1500 °C. Immense quantities of fuel are required for the production of cement. Traditionally, energy from fossil fuels was solely relied upon for the production of cement. The overarching project objective is to evaluate the use of alternative fuels to lessen the dependence on non-renewable resources to produce portland cement. The key objective of using alternative fuels is to continue to produce high-quality cement while decreasing the use of non-renewable fuels and minimizing the impact on the environment. Burn characteristics and thermodynamic parameters were evaluated with a laboratory burn simulator under conditions that mimic those in the preheater where the fuels are brought into a cement plant. A drop-tube furnace and visualization method were developed that show potential for evaluating time- and space-resolved temperature distributions for fuel solid particles and liquid droplets undergoing combustion in various combustion atmospheres. Downdraft gasification has been explored as a means to extract chemical energy from poultry litter while limiting the throughput of potentially deleterious components with regards to use in firing a cement kiln. Results have shown that the clinkering is temperature independent, at least within the controllable temperature range. Limestone also had only a slight effect on the fusion when used to coat the pellets. However, limestone addition did display some promise in regards to chlorine capture, as ash analyses showed chlorine concentrations of more than four times greater in the limestone infused ash as compared to raw poultry litter. A reliable and convenient sampling procedure was developed to estimate the combustion quality of broiler litter that is the best compromise between convenience and reliability by means of statistical analysis. Multi-day trial burns were conducted at a full-scale cement plant with alternative fuels to examine their compatibility with the cement production process. Construction and demolition waste, woodchips, and soybean seeds were used as alternative fuels at a full-scale cement production facility. These fuels were co-fired with coal and waste plastics. The alternative fuels used in this trial accounted for 5 to 16 % of the total energy consumed during these burns. The overall performance of the portland cement produced during the various trial burns performed for practical purposes very similar to the cement produced during the control burn. The cement plant was successful in implementing alternative fuels to produce a consistent, high-quality product that increased cement performance while reducing the environmental footprint of the plant. The utilization of construction and demolition waste, woodchips and soybean seeds proved to be viable replacements for traditional fuels. The future use of these fuels depends on local availability, associated costs, and compatibility with a facilityâ??s production process.

Anton K. Schindler; Steve R. Duke; Thomas E. Burch; Edward W. Davis; Ralph H. Zee; David I. Bransby; Carla Hopkins; Rutherford L. Thompson; Jingran Duan; Vignesh Venkatasubramanian; Stephen Giles.

2012-06-30T23:59:59.000Z

47

SENSITIVITY OF THE BOND STRENGTH TO THE STRUCTURE OF THE INTERFACE BETWEEN REINFORCEMENT AND CEMENT, AND THE  

E-Print Network [OSTI]

Ashland Petroleum Co. (Ashland, KY). Cement paste made from Portland cement (Type I) from Lafarge Corp

Chung, Deborah D.L.

48

apparentees perspectives pour: Topics by E-print Network  

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

du Canada (ASFC) s'efforce de mettre jour Charette, Andr 16 Scnarios pour un Micro Smart Grid Autonomique Sylvain Frey Physics Websites Summary: Scnarios pour un Micro...

49

Observing Massive Galaxy Formation  

E-Print Network [OSTI]

A major goal of contemporary astrophysics is understanding the origin of the most massive galaxies in the universe, particularly nearby ellipticals and spirals. Theoretical models of galaxy formation have existed for many decades, although low and high redshift observations are only beginning to put constraints on different ideas. We briefly describe these observations and how they are revealing the methods by which galaxies form by contrasting and comparing fiducial rapid collapse and hierarchical formation model predictions. The available data show that cluster ellipticals must have rapidly formed at z > 2, and that up to 50% of all massive galaxies at z ~ 2.5 are involved in major mergers. While the former is consistent with the monolithic collapse picture, we argue that hierarchal formation is the only model that can reproduce all the available observations.

Christopher J. Conselice

2002-12-20T23:59:59.000Z

50

Fe-containing phases in hydrated cements  

SciTech Connect (OSTI)

In this study synchrotron X-ray absorption spectroscopy (XAS) has been applied, an element specific technique which allows Fe-containing phases to be identified in the complex mineral mixture of hydrated cements. Several Fe species contributed to the overall Fe K-edge spectra recorded on the cement samples. In the early stage of cement hydration ferrite was the dominant Fe-containing mineral. Ferrihydrite was detected during the first hours of the hydration process. After 1 day the formation of Al- and Fe-siliceous hydrogarnet was observed, while the amount of ferrihydrite decreased. The latter finding agrees with thermodynamic modeling, which predicts the formation of Fe-siliceous hydrogarnet in Portland cement systems. The presence of Al- and Fe-containing siliceous hydrogarnet was further substantiated in the residue of hydrated cement by performing a selective dissolution procedure. - Highlights: • Fe bound to ferrihydrite at early age hydration • Fe found to be stable in siliceous hydrogarnet at longer term age hydration • Fe-containing AFt and AFm phases are less stable than siliceous hydrogarnet. • The study demonstrates EXAFS used to identify amorphous or poorly crystalline phases.

Dilnesa, B.Z., E-mail: belay.dilnesa@gmail.com [Empa, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600 Dübendorf (Switzerland); Wieland, E. [Paul Scherrer Institute, Laboratory for Waste Management, 5232 Villigen PSI (Switzerland); Lothenbach, B. [Empa, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, 8600 Dübendorf (Switzerland); Dähn, R. [Paul Scherrer Institute, Laboratory for Waste Management, 5232 Villigen PSI (Switzerland); Scrivener, K.L. [Ecole Polytechnique Federal de Lausanne (EPFL), Laboratory for Construction Materials, 1015 Lausanne (Switzerland)

2014-04-01T23:59:59.000Z

51

Low pour crude oil compositions  

SciTech Connect (OSTI)

This patent describes and improvement in the process of transporting waxy crude oils through a pipeline. It comprises: incorporating into the crude oil an effective pour point depressant amount of an additive comprising a polymer selected from the group consisting of copolymers of ethylene and acrylonitrile, and terpolymers of ethylene, acrylonitrile and a third monomer selected from the group consisting of vinyl acetate, carbon monoxide, alkyl acrylates, alkyl methacrylates, alkyl vinyl ethers, vinyl chloride, vinyl fluoride, acrylic acid, and methacrylic acid, wherein the amount of third monomer in the terpolymer ranges from about 0.1 to about 10.0 percent by weight.

Motz, K.L.; Latham, R.A.; Statz, R.J.

1990-05-22T23:59:59.000Z

52

INVESTIGATIONS ON HYDRAULIC CEMENTS FROM SPENT OIL SHALE  

E-Print Network [OSTI]

20 to 40% of the oil shale, and explosively rubblizing andCEMENTS FROM SPENT OIL SHALE P.K. Mehta and P. Persoff AprilCement Manufacture from Oil Shale, U.S. Patent 2,904,445,

Mehta, P.K.

2012-01-01T23:59:59.000Z

53

Identification of Concrete Incompatibilities Using Cement Paste Rheology  

E-Print Network [OSTI]

as well as heat evolution abnormalities. The objectives of the present study were to examine the applicability of the dynamic shear rheometer (DSR) to measure cement paste rheology, and to identify cement and mineral/chemical admixture incompatibilities...

Jang, Se Hoon

2010-07-14T23:59:59.000Z

54

Development of an Improved Cement for Geothermal Wells  

Broader source: Energy.gov [DOE]

DOE Geothermal Peer Review 2010 - Presentation. Project objectives: Develop a novel, zeolite-containing lightweight, high temperature, high pressure geothermal cement, which will provide operators with an easy to use, flexible cementing system that saves time and simplifies logistics.

55

Energy Efficiency Improvement Opportunities for the Cement Industry  

E-Print Network [OSTI]

and energy savings per tonne of cement produced are estimated and then carbon dioxide emissionsand energy savings per tonne of cement produced are estimated and then carbon dioxide emissions

Worrell, Ernst

2008-01-01T23:59:59.000Z

56

Master Thesis: Simulation of plastic deformation in cemented carbide inserts  

E-Print Network [OSTI]

Master Thesis: Simulation of plastic deformation in cemented carbide inserts Background Sandvik in cemented carbide, high-speed steel and other hard materials such as diamond, cubic boron nitride in cemented carbide inserts will be performed using the FEM software Ansys and AdvantEdge. The work

Haviland, David

57

NIST Special Publication 1173 Virtual Cement and Concrete  

E-Print Network [OSTI]

#12;NIST Special Publication 1173 Virtual Cement and Concrete Testing Laboratory Version 9.5 User;Virtual Cement and Concrete Testing Laboratory Version 9.5 User Guide Jeffrey W. Bullard1 Materials-8615 This document serves as the user's guide for the Virtual Cement and Con- crete Testing Laboratory (VCCTL

58

Capture of green-house carbon dioxide in Portland cement  

SciTech Connect (OSTI)

A novel process has been developed to sequester green-house carbon dioxide produced by the cement industry in precast cement products. Typically, 10--24 wt % of CO{sub 2} produced by calcination of calcium carbonate during clinkering of the cement may be captured. The carbonation process also cures the cement paste within minutes into hard bodies. The process maintains high pH conditions during curing, to allow conventional steel reinforcement of concrete. The process will save time and money to the cement industry, and at the same time, help them to comply with the Clean Air Act by sequestering the green-house carbon dioxide.

Wagh, A.S.; Singh, D.; Pullockaran, J.; Knox, L.

1993-12-31T23:59:59.000Z

59

INVESTIGATIONS ON HYDRAULIC CEMENTS FROM SPENT OIL SHALE  

SciTech Connect (OSTI)

A process for making hydraulic cements from spent oil shale is described in this paper. Inexpensive cement is needed to grout abandoned in-situ retorts of spent shale for subsidence control, mitigation of leaching, and strengthening the retorted mass in order to recover oil from adjacent pillars of raw shale. A hydraulic cement was produced by heating a 1:1 mixture of Lurgi spent shale and CaCO{sub 3} at 1000 C for one hour. This cement would be less expensive than ordinary portland cement and is expected to fulfill the above requirements.

Mehta, P.K.; Persoff, P.

1980-04-01T23:59:59.000Z

60

Comparison of modified sulfur cement and hydraulic cement for encapsulation of radioactive and mixed wastes  

SciTech Connect (OSTI)

The majority of solidification/stabilization systems for low-level radioactive waste (LLW) and mixed waste, both in the commercial sector and at Department of Energy (DOE) facilities, utilize hydraulic cement (such as portland cement) to encapsulate waste materials and yield a monolithic solid waste form for disposal. A new and innovative process utilizing modified sulfur cement developed by the US Bureau of Mines has been applied at Brookhaven National Laboratory (BNL) for the encapsulation of many of these problem'' wastes. Modified sulfur cement is a thermoplastic material, and as such, it can be heated above it's melting point (120{degree}C), combined with dry waste products to form a homogeneous mixture, and cooled to form a monolithic solid product. Under sponsorship of the DOE, research and development efforts at BNL have successfully applied the modified sulfur cement process for treatment of a range of LLWs including sodium sulfate salts, boric acid salts, and incinerator bottom ash and for mixed waste contaminated incinerator fly ash. Process development studies were conducted to determine optimal waste loadings for each waste type. Property evaluation studies were conducted to test waste form behavior under disposal conditions by applying relevant performance testing criteria established by the Nuclear Regulatory Commission (for LLW) and the Environmental Protection Agency (for hazardous wastes). Based on both processing and performance considerations, significantly greater waste loadings were achieved using modified sulfur cement when compared with hydraulic cement. Technology demonstration of the modified sulfur cement encapsulation system using production-scale equipment is scheduled for FY 1991. 12 refs., 8 figs., 3 tabs.

Kalb, P.D.; Heiser, J.H. III; Colombo, P.

1990-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

How to run and cement liners  

SciTech Connect (OSTI)

Testing the top of a liner after it has been cemented is necessary to ensure a well's integrity. However, whether done with or without packers there are potential problems attendant with either method that can occur if the tests are not properly engineered. A discussion of these problems and ways to avoid them is presented.

Bowman, G.R.; Sherer, B.

1988-09-01T23:59:59.000Z

62

Burning hazardous waste in cement kilns  

SciTech Connect (OSTI)

The cement manufacturing process is one of the oldest in the world, having been in practice for over 2000 years. It is also one of the most energy intensive, with up to 65 percent of the cost of the product attributable to energy consumption. In addition to high energy demand, the process conditions include extremely high temperatures. Cement clinker forms when the correct mixture of raw materials is heated to 2650/sup 0/ F. This requires combustion temperatures exceeding 3000/sup 0/ F. under oxidizing conditions. To accomplish this, gas temperatures above 2000/sup 0/ F. occur for several seconds (typically five seconds), which is much longer than residence times in permitted hazardous waste incinerators. These conditions are extremely favorable to the destruction of organic compounds and have led to extensive investigation into the potential for burning hazardous waste in cement kilns. Cement kilns consuming hazardous wastes have been tested for air emissions under various operating conditions. The substantial body of information on the emissions and handling of hazardous wastes from these studies has demonstrated that effective destruction of wastes can be accomplished with the added benefits of energy conservation and no significant change in air emissions.

Chadbourne, J.F.; Helmsteller, A.J.

1983-06-01T23:59:59.000Z

63

Massive neutrinos and cosmology  

E-Print Network [OSTI]

The present experimental results on neutrino flavour oscillations provide evidence for non-zero neutrino masses, but give no hint on their absolute mass scale, which is the target of beta decay and neutrinoless double-beta decay experiments. Crucial complementary information on neutrino masses can be obtained from the analysis of data on cosmological observables, such as the anisotropies of the cosmic microwave background or the distribution of large-scale structure. In this review we describe in detail how free-streaming massive neutrinos affect the evolution of cosmological perturbations. We summarize the current bounds on the sum of neutrino masses that can be derived from various combinations of cosmological data, including the most recent analysis by the WMAP team. We also discuss how future cosmological experiments are expected to be sensitive to neutrino masses well into the sub-eV range.

Julien Lesgourgues; Sergio Pastor

2006-05-29T23:59:59.000Z

64

Corrosion-resistant Foamed Cements for Carbon Steels  

SciTech Connect (OSTI)

The cementitious material consisting of Secar #80, Class F fly ash, and sodium silicate designed as an alternative thermal-shock resistant cement for the Enhanced Geothermal System (EGS) wells was treated with cocamidopropyl dimethylamine oxide-based compound as foaming agent (FA) to prepare numerous air bubble-dispersed low density cement slurries of and #61603;1.3 g/cm3. Then, the foamed slurry was modified with acrylic emulsion (AE) as corrosion inhibitor. We detailed the positive effects of the acrylic polymer (AP) in this emulsion on the five different properties of the foamed cement: 1) The hydrothermal stability of the AP in 200 and #61616;C-autoclaved cements; 2) the hydrolysis-hydration reactions of the slurry at 85 and #61616;C; 3) the composition of crystalline phases assembled and the microstructure developed in autoclaved cements; 4) the mechanical behaviors of the autoclaved cements; and, 5) the corrosion mitigation of carbon steel (CS) by the polymer. For the first property, the hydrothermal-catalyzed acid-base interactions between the AP and cement resulted in Ca-or Na-complexed carboxylate derivatives, which led to the improvement of thermal stability of the AP. This interaction also stimulated the cement hydration reactions, enhancing the total heat evolved during cement’s curing. Addition of AP did not alter any of the crystalline phase compositions responsible for the strength of the cement. Furthermore, the AP-modified cement developed the porous microstructure with numerous defect-free cavities of disconnected voids. These effects together contributed to the improvement of compressive-strength and –toughness of the cured cement. AP modification of the cement also offered an improved protection of CS against brine-caused corrosion. There were three major factors governing the corrosion protection: 1) Reducing the extents of infiltration and transportation of corrosive electrolytes through the cement layer deposited on the underlying CS surfaces; 2) inhibiting the cathodic reactions at the corrosion site of CS; 3) extending the coverage of cement over CS surfaces; and, 4) improving the adherence of the cement to CS surfaces. Thus, the CS’s corrosion rate of 176 milli inch/per year (mpy) for 1 wt% FA-foamed cement without AP was considerably reduced to 69 mpy by adding only 2 wt% AP. Addition of AP at 10 wt% further reduced this rate to less than 10 mpy.

Sugama T.; Gill, S.; Pyatina, T., Muraca, A.; Keese, R.; Khan, A.; Bour, D.

2012-12-01T23:59:59.000Z

65

Massively Deployed Sensors Final Project Report  

E-Print Network [OSTI]

Massively Deployed Sensors Final Project Report Power Systems Engineering Research Center Systems Engineering Research Center Massively Deployed Sensors Final Project Report Editors Jonathan project titled "Massively Deployed Sensors," PSERC project T-31. We express our appreciation

66

Cement Kiln Flue Gas Recovery Scrubber Project  

SciTech Connect (OSTI)

The Cement Kiln Flue Gas Recovery Scrubber Project was a technical success and demonstrated the following: CKD can be used successfully as the sole reagent for removing SO2 from cement kiln flue gas, with removal efficiencies of 90 percent or greater; Removal efficiencies for HCl and VOCs were approximately 98 percent and 70 percent, respectively; Particulate emissions were low, in the range of 0.005 to 0.007 grains/standard cubic foot; The treated CKD sorbent can be recycled to the kiln after its potassium content has been reduced in the scrubber, thereby avoiding the need for landfilling; The process can yield fertilizer-grade K2SO4, a saleable by-product; and Waste heat in the flue gas can provide the energy required for evaporation and crystallization in the by-product recovery operation. The demonstration program established the feasibility of using the Recovery Scrubber{trademark} for desulfurization of flue gas from cement kilns, with generally favorable economics, assuming tipping fees are available for disposal of ash from biomass combustion. The process appears to be suitable for commercial use on any type of cement kiln. EPA has ruled that CKD is a nonhazardous waste, provided the facility meets Performance Standards for the Management of CKD (U.S. Environmental Protection Agency 1999d). Therefore, regulatory drivers for the technology focus more on reduction of air pollutants and pollution prevention, rather than on treating CKD as a hazardous waste. Application of the Recovery Scrubbe{trademark} concept to other waste-disposal operations, where pollution and waste reductions are needed, appears promising.

National Energy Technology Laboratory

2001-11-30T23:59:59.000Z

67

New techniques for monitoring cement hydration under simulated well conditions  

SciTech Connect (OSTI)

Fourier transform infrared spectroscopy and synchrotron X-ray powder diffraction methods are described for studying cement hydration chemistry at temperatures up to 200 C, covering the normal temperature range of wellbore cementing. The methods provide complementary information on the transformation of silicate, ferrite and sulfate minerals. The thermal decomposition of the cement mineral ettringite is shown to occur at 114 C in a sealed system in contact with water. The FTIR spectrum of a well cement slurry hydrating at 150 C and 2,000 psi is analyzed. The anomalous thickening time behavior of certain cements around 75--100 C is discussed in the light of new data on the hydration of a Class G cement at 65 and 95 C, with and without retarder.

Luke, K.; Hall, C.; Jones, T. [Schlumberger Cambridge Research (United Kingdom); Barnes, P.; Turillas, X.; Lewis, A. [Univ. of London (United Kingdom). Birkbeck College

1995-11-01T23:59:59.000Z

68

Effective Permeability Change in Wellbore Cement with Carbon Dioxide Reaction  

SciTech Connect (OSTI)

Portland cement, a common sealing material for wellbores for geological carbon sequestration was reacted with CO{sub 2} in supercritical, gaseous, and aqueous phases at various pressure and temperature conditions to simulate cement-CO{sub 2} reaction along the wellbore from carbon injection depth to the near-surface. Hydrated Portland cement columns (14 mm diameter x 90 mm length; water-to-cement ratio = 0.33) including additives such as steel coupons and Wallula basalt fragments were reacted with CO{sub 2} in the wet supercritical (the top half) and dissolved (the bottom half) phases under carbon sequestration condition with high pressure (10 MPa) and temperature (50 C) for 5 months, while small-sized hydrated Portland cement columns (7 mm diameter x 20 mm length; water-to-cement ratio = 0.38) were reacted with CO{sub 2} in dissolved phase at high pressure (10 MPa) and temperature (50 C) for 1 month or with wet CO{sub 2} in gaseous phase at low pressure (0.2 MPa) and temperature (20 C) for 3 months. XMT images reveal that the cement reacted with CO{sub 2} saturated groundwater had degradation depth of {approx}1 mm for 1 month and {approx}3.5 mm for 5 month, whereas the degradation was minor with cement exposure to supercritical CO{sub 2}. SEM-EDS analysis showed that the carbonated cement was comprised of three distinct zones; the innermost less degraded zone with Ca atom % > C atom %, the inner degraded zone with Ca atom % {approx} C atom % due to precipitation of calcite, the outer degraded zone with C atom % > Ca atom % due to dissolution of calcite and C-S-H, as well as adsorption of carbon to cement matrix. The outer degraded zone of carbonated cement was porous and fractured because of dissolution-dominated reaction by carbonic acid exposure, which resulted in the increase in BJH pore volume and BET surface area. In contrast, cement-wet CO{sub 2}(g) reaction at low P (0.2 MPa)-T (20 C) conditions for 1 to 3 months was dominated by precipitation of micron-sized calcite on the outside surface of cement, which resulted in the decrease in BJH pore volume and BET surface area. Cement carbonation and pore structure change are significantly dependent on pressure and temperature conditions as well as the phase of CO{sub 2}, which controls the balance between precipitation and dissolution in cement matrix. Geochemical modeling result suggests that ratio of solid (cement)-to-solution (carbonated water) has a significant effect on cement carbonation, thus the cement-CO{sub 2} reaction experiment needs to be conducted under realistic conditions representing the in-situ wellbore environment of carbon sequestration field site. Total porosity and air permeability for a duplicate cement column with water-to-cement ratio of 0.38 measured after oven-drying by Core Laboratories using Boyle's Law technique and steady-state method were 31% and 0.576 mD. A novel method to measure the effective liquid permeability of a cement column using X-ray micro-tomography images after injection of pressurized KI (potassium iodide) is under development by PNNL. Preliminary results indicate the permeability of a cement column with water-to-cement ratio of 0.38 is 4-8 mD. PNNL will apply the method to understand the effective permeability change of Portland cement by CO{sub 2}(g) reaction under a variety of pressure and temperature conditions to develop a more reliable well-bore leakage risk model.

Um, Wooyong; Jung, Hun Bok; Martin, Paul F.; McGrail, B. Peter

2011-11-01T23:59:59.000Z

69

Electromagnetic properties of massive neutrinos  

SciTech Connect (OSTI)

The vertex function for a virtual massive neutrino is calculated in the limit of soft real photons. A method based on employing the neutrino self-energy operator in a weak external electromagnetic field in the approximation linear in the field is developed in order to render this calculation of the vertex function convenient. It is shown that the electric charge and the electric dipole moment of the real neutrino are zero; only the magnetic moment is nonzero for massive neutrinos. A fourth-generation heavy neutrino of mass not less than half of the Z-boson mass is considered as a massive neutrino.

Dobrynina, A. A., E-mail: aleksandradobrynina@rambler.ru; Mikheev, N. V.; Narynskaya, E. N. [Demidov Yaroslavl State University (Russian Federation)] [Demidov Yaroslavl State University (Russian Federation)

2013-10-15T23:59:59.000Z

70

An investigation of cement mortar thermal storage characteristics  

E-Print Network [OSTI]

energy storage characteristics of solid cement mortar cylinders. Two var1a- tions 1nvolving mechanically induced porosity were also investigated. Rocks, a commonly used sensible heat storage material, were tested to prov1de a reference for the cement... mortar. A numer1cal model, analogous to program available for rock bed storage systems, simulating the cement mortar cylinder storage section was developed. Heat transfer coefficients were calculated from the experimental data for use in the model...

Davis, Glenn Baker

2012-06-07T23:59:59.000Z

71

Energy Efficiency Improvement Opportunities for the Cement Industry  

E-Print Network [OSTI]

the small cement plants, earthen vertical kiln (and hollowcement plant in North China utilizing vertical shaft kilnscement has ordered a vertical roller mill for the new kiln

Worrell, Ernst

2008-01-01T23:59:59.000Z

72

Energy Efficiency Improvement Opportunities for the Cement Industry  

E-Print Network [OSTI]

Lime Institute. 2001. Energy Efficiency Opportunity Guide inIndustry, Office of Energy Efficiency, Natural Resourcesof a Cement Kiln, Energy Efficiency Demonstration Scheme,

Worrell, Ernst

2008-01-01T23:59:59.000Z

73

Multifunctional Corrosion-resistant Foamed Well Cement Composites  

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

Multifunctional Corrosion-resistant Foamed Well Cement Composites Project Officer: Dan KingGreg Stillman Total budget: 300 K April 24 , 2013 Principal Investigator: Dr. Toshifumi...

74

Optimization Online - The carbon leakage effect on the cement ...  

E-Print Network [OSTI]

Feb 8, 2015 ... This paper investigates the impact of these two policies on the cement sector ... Environmental policies, Generalized Nash Equilibrium Problem.

Elisabetta Allevi

2015-02-08T23:59:59.000Z

75

Development of an Improved Cement for Geothermal Wells  

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

availability. * Schedule slippage resulting from delays in the fabrication of Chandler Engineering specialized high pressurehigh temperature cement testing equipment. 6 | US...

76

Energy Efficiency Improvement Opportunities for the Cement Industry  

E-Print Network [OSTI]

on Power Generation by Waste Heat of the Kiln in NingguoPure Low Temperature & Waste Heat in Beijing Cement Ltd. ;flash distillation waste heat power generation demonstration

Worrell, Ernst

2008-01-01T23:59:59.000Z

77

Stabilizing coal-water mixtures with Portland cement  

DOE Patents [OSTI]

Coal-water mixes stabilized by the addition of Portland cement which may additionally contain retarding carbohydrates, or borax are described. 1 tab.

Steinberg, M.; Krishna, C.R.

1984-10-17T23:59:59.000Z

78

Identification of active agents for tetrachloroethylene degradation in Portland cement slurry containing ferrous iron  

E-Print Network [OSTI]

-EDS) were used to identify minerals in chemical mixtures that have high activities. Results indicate that active agents for PCE degradation in Portland cement slurries and in cement extracts might be one of several AFm phases. However, systems without cement...

Ko, Sae Bom

2006-08-16T23:59:59.000Z

79

Instantaneous In-Situ Determination of Water-Cement Ratio of Fresh Concrete  

E-Print Network [OSTI]

method for cement content determination of fresh concrete.Cement and Concrete Research, 1980. 10(1): p. 23-34. Hime,the cement content of plastic concrete. ASTM Bulletin, 1955.

Mancio, Mauricio; Moore, Jeffrey R.; Brooks, Zenzile; Monteiro, Paulo J. M.; Glaser, Steve D.

2010-01-01T23:59:59.000Z

80

avenir pour le: Topics by E-print Network  

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

: France (2008)" 12;1 25 Boyer, Edmond 53 N d'ordre 1137 QUEL TOURISME POUR LE MAROC Physics Websites Summary: 1 Anne 2011 N d'ordre 1137 QUEL TOURISME POUR LE...

Note: This page contains sample records for the topic "massive cement pour" 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

Energy Efficiency Improvement and Cost Saving Opportunities for Cement Making. An ENERGY STAR Guide for Energy and Plant Managers  

E-Print Network [OSTI]

Modern Vertical Shaft Kiln Technology” World Cement 1 26cement has ordered a vertical roller mill for the new kiln

Worrell, Ernst

2008-01-01T23:59:59.000Z

82

E-Print Network 3.0 - affect cement penetration Sample Search...  

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

a coating Summary: as an admixture in cement and as a coating on cement for electromagnetic interference shielding'' J. Cao, D... parameters that affect the shielding...

83

E-Print Network 3.0 - aluminate cement blended Sample Search...  

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

predicting the setting times of Type I cement concrete and blended... -29, 1980. 20. Tay, J. .H., Properties of Pulverized Sludge Ash Blended Cement. ACI Materials Journals... OF...

84

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

Wang, L. , 2008. Alternative fuel using and waste materialPolicy Research on Alternative Fuels for Cement Industry incement and using alternative fuels in the cement kiln. There

Price, Lynn

2010-01-01T23:59:59.000Z

85

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

UNFCCC), 2007 b. Energy efficiency measures at cementUNFCCC), 2007 c. Energy efficiency measures at cementBanerjee, R. , 2005. Energy Efficiency and Demand Side

Price, Lynn

2010-01-01T23:59:59.000Z

86

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

and MAIN, 1993. Energy Technology in the Cement Industrialof Demonstrated Energy Technologies (CADDET), Internationaland MAIN. 1993. Energy Technology in the Cement Industrial

Price, Lynn

2010-01-01T23:59:59.000Z

87

Direction des immeubles Prparation du courrier prioritaire pour le Canada  

E-Print Network [OSTI]

Direction des immeubles Préparation du courrier prioritaire pour le Canada Comment faire? 1 requis ainsi que le code postal Pour expédier du courrier par Postes Canada · Vous pouvez utiliser une adresse civique et/ou une case postale. · Pour recevoir du courrier par Postes Canada, vous devez utiliser

Charette, André

88

POURED EARTH AS CONCRETE Lionel RONSOUX, Mariette MOEVUS, Yves JORAND,  

E-Print Network [OSTI]

1 POURED EARTH AS CONCRETE Lionel RONSOUX, Mariette MOEVUS, Yves JORAND, Sandrine MAXIMILIEN and Contemporary Architecture Keywords: poured earth, clay concrete, grain packing, clay dispersion Abstract: In order to pour an earthen material in a liquid state, as a concrete, technologies used by concrete

Boyer, Edmond

89

Workers Pour 1 Million Gallons of Grout into Massive Tanks | Department of  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarlyEnergyDepartment ofDepartment of Energyof Energy This webinarJanuary 1, 2012Energy

90

Guidebook for Using the Tool BEST Cement: Benchmarking and Energy Savings Tool for the Cement Industry  

SciTech Connect (OSTI)

The Benchmarking and Energy Savings Tool (BEST) Cement is a process-based tool based on commercially available efficiency technologies used anywhere in the world applicable to the cement industry. This version has been designed for use in China. No actual cement facility with every single efficiency measure included in the benchmark will likely exist; however, the benchmark sets a reasonable standard by which to compare for plants striving to be the best. The energy consumption of the benchmark facility differs due to differences in processing at a given cement facility. The tool accounts for most of these variables and allows the user to adapt the model to operational variables specific for his/her cement facility. Figure 1 shows the boundaries included in a plant modeled by BEST Cement. In order to model the benchmark, i.e., the most energy efficient cement facility, so that it represents a facility similar to the user's cement facility, the user is first required to input production variables in the input sheet (see Section 6 for more information on how to input variables). These variables allow the tool to estimate a benchmark facility that is similar to the user's cement plant, giving a better picture of the potential for that particular facility, rather than benchmarking against a generic one. The input variables required include the following: (1) the amount of raw materials used in tonnes per year (limestone, gypsum, clay minerals, iron ore, blast furnace slag, fly ash, slag from other industries, natural pozzolans, limestone powder (used post-clinker stage), municipal wastes and others); the amount of raw materials that are preblended (prehomogenized and proportioned) and crushed (in tonnes per year); (2) the amount of additives that are dried and ground (in tonnes per year); (3) the production of clinker (in tonnes per year) from each kiln by kiln type; (4) the amount of raw materials, coal and clinker that is ground by mill type (in tonnes per year); (5) the amount of production of cement by type and grade (in tonnes per year); (6) the electricity generated onsite; and, (7) the energy used by fuel type; and, the amount (in RMB per year) spent on energy. The tool offers the user the opportunity to do a quick assessment or a more detailed assessment--this choice will determine the level of detail of the energy input. The detailed assessment will require energy data for each stage of production while the quick assessment will require only total energy used at the entire facility (see Section 6 for more details on quick versus detailed assessments). The benchmarking tool provides two benchmarks--one for Chinese best practices and one for international best practices. Section 2 describes the differences between these two and how each benchmark was calculated. The tool also asks for a target input by the user for the user to set goals for the facility.

Galitsky, Christina; Price, Lynn; Zhou, Nan; Fuqiu , Zhou; Huawen, Xiong; Xuemin, Zeng; Lan, Wang

2008-07-30T23:59:59.000Z

91

Cement (2010 MECS) | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed New Substation Sites ProposedOccupational HealthcatalystsMaking Same -Cement (2010

92

High Temperature Cements | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to: navigation,Ohio:GreerHi Gtel Jump to: navigation,Solar Power Plant JumpDrillingCements

93

Cement Bond Log | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160Benin:Energy Information on PV EconomicsOregon: Energy ResourcesCeilingCement Bond

94

Communication Electric polarization in carbon fiber-reinforced cement  

E-Print Network [OSTI]

Communication Electric polarization in carbon fiber-reinforced cement Sihai Wen, D.D.L. Chung Abstract Electric polarization induced an increase of the measured electrical resistivity of carbon fiber of the cement paste through the use of carbon fibers that were more crystalline, the increase of the fiber

Chung, Deborah D.L.

95

Portland Cement Concrete Pavement Shannon Golden, Alabama DOT  

E-Print Network [OSTI]

Portland Cement Concrete Pavement Shannon Golden, Alabama DOT PORTLAND CEMENT CONCRETE PAVEMENT PROJECT · First in Alabama in more than 25 years! · IM-I059 (342) Etowah County ­ I-59 Concrete Pavement Rehabilitation with Unbonded Concrete Overlay ­ Length: 10.9 miles ­ Thickness: 11.0 to 13.5 inches ­ Volume: 300

96

Magnesium phosphate glass cements with ceramic-type properties  

DOE Patents [OSTI]

Rapid setting magnesium phosphate (Mg glass) cementitious materials consisting of magnesium phosphate cement paste, polyborax and water-saturated aggregate exhibiting rapid setting and high early strength characteristics. The magnesium glass cement is prepared from a cation-leachable powder and a bivalent metallic ion-accepting liquid such as an aqueous solution of diammonium phosphate and ammonium polyphosphate. The cation-leachable powder includes a mixture of two different magnesium oxide powders processed and sized differently which when mixed with the bivalent metallic ion-accepting liquid provides the magnesium glass cement consisting primarily of magnesium ortho phosphate tetrahydrate, with magnesium hydroxide and magnesium ammonium phosphate hexahydrate also present. The polyborax serves as a set-retarder. The resulting magnesium mono- and polyphosphate cements are particularly suitable for use as a cementing matrix in rapid repair systems for deteriorated concrete structures as well as construction materials and surface coatings for fireproof structures.

Sugama, Toshifumi (Mastic Beach, NY); Kukacka, Lawrence E. (Port Jefferson, NY)

1984-03-13T23:59:59.000Z

97

Magnesium-phosphate-glass cements with ceramic-type properties  

DOE Patents [OSTI]

Rapid setting magnesium phosphate (Mg glass) cementitious materials consisting of magnesium phosphate cement paste, polyborax and water-saturated aggregate, exhibits rapid setting and high early strength characteristics. The magnesium glass cement is prepared from a cation-leachable powder and a bivalent metallic ion-accepting liquid such as an aqueous solution of diammonium phosphate and ammonium polyphosphate. The cation-leachable powder includes a mixture of two different magnesium oxide powders processed and sized differently which when mixed with the bivalent metallic ion-accepting liquid provides the magnesium glass cement consisting primarily of magnesium ortho phosphate tetrahydrate, with magnesium hydroxide and magnesium ammonium phosphate hexahydrate also present. The polyborax serves as a set-retarder. The resulting magnesium mono- and polyphosphate cements are particularly suitable for use as a cementing matrix in rapid repair systems for deteriorated concrete structures as well as construction materials and surface coatings for fireproof structures.

Sugama, T.; Kukacka, L.E.

1982-09-23T23:59:59.000Z

98

Effect of Elevated Curing Temperature on Early Hydration and Microstructure of Composite Cements  

E-Print Network [OSTI]

Effect of Elevated Curing Temperature on Early Hydration and Microstructure of Composite Cements J, Seascale, Cumbria, CA20 1PG, UK Abstract The heat of hydration of a number of composite cement systems has of composite cements based on the partial replacement of Portland cement by waste materials has become

Sheffield, University of

99

Abstract The concurrent goals of cement hydration are to percolate (bridge) the original  

E-Print Network [OSTI]

Cement hydration Ã? Low temperature calorimetry Ã? Microstructure Ã? Percolation Ã? Porosity Ã? Rheology Ã?, however, cement-based materials exhibit a highly dynamic (micro)structure that is extremely sen- sitive. Because many of the cement hydration prod- ucts form around the initial cement clinker par- ticles

Bentz, Dale P.

100

Time-dependent behaviour of hardened cement paste under isotropic loading  

E-Print Network [OSTI]

of hardened cement paste under isotropic loading, Cement and Concrete Research, doi: 10.1016/j.cemconres.2012.03.002 hal-00689716,version1-19Apr2012 Author manuscript, published in "Cement and Concrete Research (2012 the framework of the classical theory of porous media. The effects of water-to-cement ratio and chemical

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "massive cement pour" 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

Energy, environmental and greenhouse gas effects of using alternative fuels in cement production  

E-Print Network [OSTI]

1 Energy, environmental and greenhouse gas effects of using alternative fuels in cement to an increase of AF use from 8.7% to 20.9% of the total energy consumption. 2. One of the alternative fuels used cement industry produces about 3.3 billion tonnes of cement annually. Cement production is energy

Columbia University

102

Z .Chemical Geology 152 1998 257271 The thermal and cementation histories of a sandstone petroleum  

E-Print Network [OSTI]

Z .Chemical Geology 152 1998 257­271 The thermal and cementation histories of a sandstone petroleum of the cement formed, the maturation of petroleum in the interbedded shales likely postdates cementation. q 1998 of partially cemented petroleum reservoirs may help in constraining the physical character of a reservoir

103

A Stable Massive Charged Particle  

E-Print Network [OSTI]

We consider the possibility of the existence of a stable massive charged particle by a minimal extension of the standard model particle content. Absolute stability in the case of singly charged particle is not possible if the usual doublet Higgs exists, unless a discrete symmetry is imposed.But a doubly charged particle is absolutely stable.

G. Rajasekaran

2011-06-08T23:59:59.000Z

104

Energy Efficiency Improvement Opportunities for the Cement Industry  

SciTech Connect (OSTI)

This report provides information on the energy savings, costs, and carbon dioxide emissions reductions associated with implementation of a number of technologies and measures applicable to the cement industry. The technologies and measures include both state-of-the-art measures that are currently in use in cement enterprises worldwide as well as advanced measures that are either only in limited use or are near commercialization. This report focuses mainly on retrofit measures using commercially available technologies, but many of these technologies are applicable for new plants as well. Where possible, for each technology or measure, costs and energy savings per tonne of cement produced are estimated and then carbon dioxide emissions reductions are calculated based on the fuels used at the process step to which the technology or measure is applied. The analysis of cement kiln energy-efficiency opportunities is divided into technologies and measures that are applicable to the different stages of production and various kiln types used in China: raw materials (and fuel) preparation; clinker making (applicable to all kilns, rotary kilns only, vertical shaft kilns only); and finish grinding; as well as plant wide measures and product and feedstock changes that will reduce energy consumption for clinker making. Table 1 lists all measures in this report by process to which they apply, including plant wide measures and product or feedstock changes. Tables 2 through 8 provide the following information for each technology: fuel and electricity savings per tonne of cement; annual operating and capital costs per tonne of cement or estimated payback period; and, carbon dioxide emissions reductions for each measure applied to the production of cement. This information was originally collected for a report on the U.S. cement industry (Worrell and Galitsky, 2004) and a report on opportunities for China's cement kilns (Price and Galitsky, in press). The information provided in this report is based on publicly-available reports, journal articles, and case studies from applications of technologies around the world.

Price, Lynn; Worrell, Ernst; Galitsky, Christina; Price, Lynn

2008-01-31T23:59:59.000Z

105

Use of Finite-element Analysis to Improve Well Cementing in HTHP Conditions  

E-Print Network [OSTI]

stresses of San Antonio cement (left) and PEEQ of cement San Antonio and Barco formation (right) after hydraulic fracturing ........ 103 Figure 5.1 UCS (top left), Young?s modulus (top right), and Poisson?s ratio (bottom) for Halliburton Portland... cements ............................................... 110 Figure 5.2 Tensile strength for Halliburton Portland cements ................................... 111 Figure 5.3 Stress strain-curve and photo of uniaxial test for Halliburton Portland cement...

Arias, Henry

2013-07-30T23:59:59.000Z

106

Massivizing Online Games: Distributed Computing Challenges and  

E-Print Network [OSTI]

Massivizing Online Social Games Scheduling in IaaS Clouds Gamification in Higher Education May 9 May 27 June 5

Iosup, Alexandru

107

Black holes with massive graviton hair  

E-Print Network [OSTI]

No-hair theorems exclude the existence of nontrivial scalar and massive vector hair outside four-dimensional, static, asymptotically flat black-hole spacetimes. We show, by explicitly building nonlinear solutions, that black holes can support massive graviton hair in theories of massive gravity. These hairy solutions are, most likely, the generic end state of the recently discovered monopole instability of Schwarzschild black holes in massive graviton theories.

Richard Brito; Vitor Cardoso; Paolo Pani

2013-09-03T23:59:59.000Z

108

X-ray Emission from Massive Stars  

E-Print Network [OSTI]

X-ray Emission from Massive Stars David Cohen Department of Physics and Astronomy Swarthmore be related to the production of X-rays on massive stars. If so, massive stars' X-rays are much different than those found our own Sun and other cooler stars like the Sun that produce X-rays via magnetic activity

Cohen, David

109

Characterization and modeling of the cemented sediment surrounding...  

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

cement phase is likely the reaction between the glass and the sea water to from a Mg-silicate, here modeled as sepiolite. Citation: Strachan DM, JV Crum, JV Ryan, and A...

110

Developpement WebPHP pour le Web Developpement Web  

E-Print Network [OSTI]

D´eveloppement WebPHP pour le Web D´eveloppement Web PHP pour le Web Jean-Michel Richer jean-michel.richer@univ-angers.fr http://www.info.univ-angers.fr/pub/richer 2008 1 / 130 #12;D´eveloppement WebPHP pour le Web Objectif´eveloppement Web fonctionnalit´es de base du langage acc`es aux bases de donn´ees (PDO) la couche objet (classe, h

Richer, Jean-Michel

111

Architecture de serveurs virtualiss pour la communaut mathmatique  

E-Print Network [OSTI]

Architecture de serveurs virtualisés pour la communauté mathématique Jacquelin Charbonnel Journées Architecture de serveurs virtualisés pour la communauté mathématique 2 / 47 Plan KVM pour un laboratoire KVM PLACO #12;Jacquelin Charbonnel - Journées ARAMIS, Lyon, juin 2012 Architecture de serveurs virtualisés

Menichi, Luc

112

Massive Stars and their Supernovae  

E-Print Network [OSTI]

Massive stars and their supernovae are prominent sources of radioactive isotopes, the observations of which thus can help to improve our astrophysical models of those. Our understanding of stellar evolution and the final explosive endpoints such as supernovae or hypernovae or gamma-ray bursts relies on the combination of magneto-hydrodynamics, energy generation due to nuclear reactions accompanying composition changes, radiation transport, and thermodynamic properties (such as the equation of state of stellar matter). Nuclear energy production includes all nuclear reactions triggered during stellar evolution and explosive end stages, also among unstable isotopes produced on the way. Radiation transport covers atomic physics (e.g. opacities) for photon transport, but also nuclear physics and neutrino nucleon/nucleus interactions in late phases and core collapse. Here we want to focus on the astrophysical aspects, i.e. a description of the evolution of massive stars and their endpoints, with a special emphasis ...

Thielemann, Friedrich-Karl; Liebendörfer, Matthias; Diehl, Roland; 10.1007/978-3-642-12698-7_4

2010-01-01T23:59:59.000Z

113

Black holes in massive gravity  

E-Print Network [OSTI]

We review the black hole solutions of the ghost-free massive gravity theory and its bimetric extension and outline the main results on the stability of these solutions against small perturbations. Massive (bi)-gravity accommodates exact black hole solutions, analogous to those of General Relativity. In addition to these solutions, hairy black holes -- solutions with no correspondent in General Relativity -- have been found numerically, whose existence is a natural consequence of the absence of the Birkhoff's theorem in these theories. The existence of extra propagating degrees of freedom, makes the stability properties of these black holes richer and more complex than those of General Relativity. In particular, the bi-Schwarzschild black hole exhibits an unstable spherically symmetric mode, while the bi-Kerr geometry is also generically unstable, both against the spherical mode and against superradiant instabilities. If astrophysical black holes are described by these solutions, the superradiant instability o...

Babichev, Eugeny

2015-01-01T23:59:59.000Z

114

associes pour les: Topics by E-print Network  

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

mode de gouvernance associatif peut se Boyer, Edmond 2 Les risques sismiques Mrida (Venezuela). Pour une association des communauts la prvention de catastrophe dans les Physics...

115

Potential for energy conservation in the cement industry  

SciTech Connect (OSTI)

This report assesses the potential for energy conservation in the cement industry. Energy consumption per ton of cement decreased 20% between 1972 and 1982. During this same period, the cement industry became heavily dependent on coal and coke as its primary fuel source. Although the energy consumed per ton of cement has declined markedly in the past ten years, the industry still uses more than three and a half times the fuel that is theoretically required to produce a ton of clinker. Improving kiln thermal efficiency offers the greatest opportunity for saving fuel. Improving the efficiency of finish grinding offers the greatest potential for reducing electricity use. Technologies are currently available to the cement industry to reduce its average fuel consumption per ton by product by as much as 40% and its electricity consumption per ton by about 10%. The major impediment to adopting these technologies is the cement industry's lack of capital as a result of low or no profits in recent years.

Garrett-Price, B.A.

1985-02-01T23:59:59.000Z

116

History and some potentials of oil shale cement  

SciTech Connect (OSTI)

The utilization of oil shale as a cement component is discussed. It was investigated in America and Europe during World War I. Additional development occurred in Western Europe, Russia, and China during the 1920s and 1930s. World War II provided further development incentives and a relatively mature technology was in place in Germany, Russia, and China prior to 1980. The utilization of oil shale in cement has taken a number of different paths. One approach has been to utilize the energy in the oil shale as the principal source for the cement plant and to use the combusted shale as a minor constituent of the plant's cement product. A second approach has been to use the combusted shale as a class C or cementitious fly-ash component in portland cement concrete. Other approaches utilizing eastern oil shale have been to use the combusted oil shale with additives as a specialty cement, or to cocombust the oil shale with coal and utilize the sulfur-rich combustion product.

Knutson, C.F.; Smith, R.P.; Russell, B.F. (Idaho National Engineering Lab., Idaho Falls, ID (USA))

1989-01-01T23:59:59.000Z

117

algorithmes multi-etape pour: Topics by E-print Network  

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

Fort, Gersende 15 Algorithmes hybrides pour la gestion intelligente de l'nergie dans les smart grids Physics Websites Summary: Algorithmes hybrides pour la gestion intelligente de...

118

Assessment of gas-side fouling in cement plants  

SciTech Connect (OSTI)

The purpose of this study is to provide an assessment of gas-side fouling in cement plants with special emphasis on heat recovery applications. Exhaust gases in the cement industry which are suitable for heat recovery range in temperature from about 400 to 1300 K, are generally dusty, may be highly abrasive, and are often heavily laden with alkalies, sulfates, and chlorides. Particulates in the exhaust streams range in size from molecular to about 100 ..mu..m in diameter and come from both the raw feed as well as the ash in the coal which is the primary fuel used in the cement industry. The major types of heat-transfer equipment used in the cement industry include preheaters, gas-to-air heat exchangers, waste heat boilers, and clinker coolers. The most important gas-side fouling mechanisms in the cement industry are those due to particulate, chemical reaction, and corrosion fouling. Particulate transport mechanisms which appear to be of greatest importance include laminar and turbulent mass transfer, thermophoresis, electrophoresis, and inertial impaction. Chemical reaction mechanisms of particular importance include the deposition of alkali sulfates, alkali chlorides, spurrite, calcium carbonate, and calcium sulfate. At sufficiently low temperatures, sulfuric acid and water can condense on heat exchanger surfaces which can cause corrosion and also attract particulates in the flow. The deleterious effects of gas-side fouling in cement plants are due to: (1) increased capital costs; (2) increased maintenance costs; (3) loss of production; and (4) energy losses. A conservative order-of-magnitude analysis shows that the cost of gas-side fouling in US cement plants is $0.24 billion annually.

Marner, W.J.

1982-09-01T23:59:59.000Z

119

Utilisation des Protocoles HARQ pour la Radio Cognitive  

E-Print Network [OSTI]

Utilisation des Protocoles HARQ pour la Radio Cognitive Romain Tajan encadré/01/2012 #12;Plan 1 Introduction 2 La Radio Cognitive Techniques de la Radio Cognitive Méthodes d'accès 3 performances du protocole IR-HARQ 4 Utilisation des protocoles HARQ pour la Radio Cognitive Utilisation de l

Dobigeon, Nicolas

120

A Review of Emerging Energy-efficiency and CO2 Emission-reduction Technologies for Cement and Concrete Production  

E-Print Network [OSTI]

and Resource Saving Technologies in Cement Industry.1:87–94. Blue World Crete. 2012. Technology. Available atOakey. 2009. CO 2 Capture Technologies for Cement Industry.

Hasanbeigi, Ali

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

The use of scrap tires in rotary cement kilns  

SciTech Connect (OSTI)

The use of scrap tires as a supplemental fuel in the United States Portland cement industry has increased significantly in the past six years. In 1990, there were two kilns using tire-derived fuel (TDF), today 30 kilns use TDF. The outlook for continued and expanded use of TDF in the U.S. cement industry should be considered favorable, with 15 kilns conducting tests to determine TDF`s applicability or in the permitting process. The Council`s estimates are that by the end of 1996, the cement industry could be consuming some 75-100 million of the 253 million annually generated scrap tires in the United States. This level of TDF usage will make the cement industry the largest market segments for scrap tires in the United States. While the long-term outlook is at present positive, there are a series of factors that have, and will likely continue to adversely impact the near-term usage of TDF. These issues, as well as the factors that are likely to positively impact the cement kiln TDF market are the subject of this presentation.

Blumenthal, M. [Scrap Tire Management Council, Washington, DC (United States)

1996-12-31T23:59:59.000Z

122

NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration  

E-Print Network [OSTI]

NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration and Microstructure Development Modeling Package. Version 3.0 Dale P. Bentz #12;NISTIR 7232 CEMHYD3D: A Three-Dimensional Cement Hydration

Bentz, Dale P.

123

Potential Energy Savings and CO2 Emissions Reduction of China's Cement Industry  

E-Print Network [OSTI]

production instantly reaches the current world best practice energyworld best practice and implement aggressive energy efficiency and carbon reduction measures in all cement productionenergy intensity of China’s cement production would reach current world

Ke, Jing

2013-01-01T23:59:59.000Z

124

Energy conservation potential of Portland cement particle size distribution control, Phase 2  

SciTech Connect (OSTI)

The main objectives of Phase 2 are to determine the feasibility of using cements with controlled particle size distributions (CPSD cements) in practical concrete applications, and to refine our estimates of the potential energy savings that may ensue from such use. The work in Phase 2 is divided into two main tasks, some parts of which will be carried out simultaneously: Task 1 will continue cement paste studies to optimize cement performance similar to those of Phase 1, but with particular emphasis on gypsum requirements, blended cements, and water-reducing admixtures. This task will also include preparation of sufficient CPSD cements for use in all Phase 2 work. Task 2 will be a comprehensive examination of the properties of concretes made with CPSD cements. This will include optimization of concrete mix designs to obtain the best possible performance for practical applications of both portland and blended cements. The effects of chemical admixtures and curing temperature variations will also be determined.

Helmuth, R.A; Whiting, D.A.

1983-01-01T23:59:59.000Z

125

Unprocessed rice husk ash as a partial replacement of cement for low-cost concrete  

E-Print Network [OSTI]

Cement is a very valuable commodity as it can be used to construct structurally sound buildings and infrastructure. However, in many developing countries cement is expensive due to the unavailability of local resources to ...

Brown, Dorothy Kamilah

2012-01-01T23:59:59.000Z

126

Potential Energy Savings and CO2 Emissions Reduction of China's Cement Industry  

E-Print Network [OSTI]

2050 China Energy and CO2 Emissions Report. Science Press,Energy Savings and CO2 Emissions Reduction of China’s CementEnergy Savings and CO2 Emissions Reduction of China’s Cement

Ke, Jing

2013-01-01T23:59:59.000Z

127

Unsteady Turbomachinery Computations Using Massively Parallel Platforms  

E-Print Network [OSTI]

Unsteady Turbomachinery Computations Using Massively Parallel Platforms Edwin van der Weide with the inherently unsteady nature of turbomachinery flows, due to the motion of the rotors, this means

Alonso, Juan J.

128

E-Print Network 3.0 - aluminate cements hydration Sample Search...  

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

INTRODUCTION Many entities currently use fly ash in portland cement concrete (PCC) pavements... Transportation & Development and Louisiana State University incorporating...

129

Emerging Energy-efficiency and CO2 Emission-reduction Technologies for Cement and Concrete Production  

E-Print Network [OSTI]

of granulated blast furnace slag and its effect on theblast furnace slag in cement results from the combined effects

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

130

Improved cement quality and grinding efficiency by means of closed mill circuit modeling  

E-Print Network [OSTI]

..............................................................................................................................185 Page x LIST OF FIGURES Figure 1.1. Portland Cement (after Bhatty et al., 2004). ....................................................1 Figure 1.2. A Simplified Schematic of a Dry Cement Manufacturing Process. ................3 Figure 1....................................13 Figure 2.2. Typical Particle Size Distribution of a Type I Portland Cement Sample. .....16 Figure 2.3. Rosin-Rammler Representation of Cement PSD...........................................21 Figure 2.4. Blaine Calculation within the Particle...

Mejeoumov, Gleb Gennadievich

2009-05-15T23:59:59.000Z

131

Downhole cement test in a very hot hole  

SciTech Connect (OSTI)

Completion of the commercial-sized Hot Dry Rock Geothermal Energy Project requires that hydraulic fractures be created between two inclined wellbores at a depth of about 4 km (15,000 ft). Isolation of a section of the open wellbore is necessary for pressurization to achieve the fracture connections. A cemented-in liner/PBR assembly is one of the methods used for zone isolation near the botton of the injection well. A downhole, pumped cement test was first conducted at a wellbore temperature of 275/sup 0/C (525/sup 0/F) to determine if a suitable slurry could be designed, pumped, and later recovered to assure the success of the cemented-in liner operation.

Pettitt, R.A.; Cocks, G.G.; Dreesen, D.N.; Sims, J.R.; Nicholson, R.W.; Boevers, B.

1982-01-01T23:59:59.000Z

132

Rapid setting of portland cement by greenhouse carbon dioxide capture  

SciTech Connect (OSTI)

Following the work by Berger et al. on rapid setting of calcium silicates by carbonation, a method of high-volume capture of CO{sub 2} in portland cement has been developed. Typically, 10--24 wt. % of CO{sub 2} produced by the calcination of calcium carbonate during clinkering, may be captured, and the set cement acquires most of its full strength in less than a day. The approach will have economic advantages in fabrication of precast structures, in emergency development of infrastructure during natural disasters, and in defense applications. Moreover, it will help the cement industry comply with the Clean Air Act of 1990 by sequestering the greenhouse carbon dioxide.

Wagh, A.S.; Singh, D.; Knox, L.J.

1994-04-01T23:59:59.000Z

133

SUJET : Silicium de type n pour cellules htrojonctions : caractrisations et modlisations  

E-Print Network [OSTI]

Catalogne et Ron Sinton de Sinton Consulting pour les discussions autour des techniques de photoluminescence

Paris-Sud XI, Université de

134

The Effect of Simulated Barium Carbonate Waste Stream on the Hydration of Composite Cement Systems  

E-Print Network [OSTI]

The Effect of Simulated Barium Carbonate Waste Stream on the Hydration of Composite Cement Systems cements, comprised of ordinary Portland cement (OPC) and blast furnace slag (BFS), are used to encapsulate it is not uncommon for up to 90% of the OPC to be replaced by BFS, which will have significant effects

Sheffield, University of

135

The effect of BaCO3 on the hydration of OPC and composite cements  

E-Print Network [OSTI]

The effect of BaCO3 on the hydration of OPC and composite cements Claire A. Utton* and Neil B of ordinary Portland cement (OPC) and up to 90% blast furnace slag (BFS), are used to encapsulate Intermediate. The effect of BaCO3 on the hydration properties of composite cements is being studied. This paper reports

Sheffield, University of

136

Virtual Cement and Concrete Testing Laboratory Educational Version 2.0 User Guide  

E-Print Network [OSTI]

1 Virtual Cement and Concrete Testing Laboratory Educational Version 2.0 User Guide Jeffrey W of the Virtual Cement and Concrete Testing Laboratory (VCCTL) software, version 2.0. Using the VCCTL software, cement hydration, computer modeling, concrete testing, microstructure, simulation, virtual laboratory

Magee, Joseph W.

137

Sulfur dioxide oxidation and plume formation at cement kilns  

SciTech Connect (OSTI)

Results of source sampling at the Glens Falls cement kiln in Glens Falls, N.Y., are reported for sulfur oxides, ammonia, hydrochloric acid, oxygen, and moisture content. The origin of a detached, high-opacity, persistent plume originating from the cement kiln stack is investigated. It is proposed that this plume is due to ammonium salts of SOx and sulfuric acid that have been formed in condensed water droplets in the plume by the pseudocatalytic action of ammonia. (1 diagram, 1 graph, 22 references, 7 tables)

Dellinger, B.; Grotecloss, G.; Fortune, C.R.; Cheney, J.L.; Homolya, J.B.

1980-10-01T23:59:59.000Z

138

Massive Variability Surveys from Venezuela  

E-Print Network [OSTI]

At the Venezuela National Astronomical Observatory we are carrying out variability surveys spanning many hundreds of square degrees near the celestial equator, using an 8k x 8k CCD Mosaic Camera optimized for drift-scanning on a 1m Schmidt telescope. Among the initial efforts was a project to obtain the first moderately deep, homogeneous sample of young stars over an area of ~180sqr.deg. encompassing the entire Orion OB1 association, one of the nearest and most active regions of star formation. The results show that variability is a powerful technique to identify pre-main sequence populations, specially in sparse areas devoid of gas and dust. We are currently developing a massive database, equipped with web-based data mining tools, that will make our data and results available to the astronomical community.

Cesar Briceno

2003-04-03T23:59:59.000Z

139

X-ray Emission from Massive Stars  

E-Print Network [OSTI]

X-ray Emission from Massive Stars David Cohen Department of Physics and Astronomy Swarthmore #12;What is the mechanism by which massive stars produce x-rays? New results from the Chandra X-ray Observatory ­ high-resolution x-ray spectroscopy: measuring Doppler broadening in emission lines Testing

Cohen, David

140

Massively Parallel Data Mining Using Reconfigurable Hardware  

E-Print Network [OSTI]

]. The basic idea is to decompose the data mining oper- ation into two components. The low-level componentMassively Parallel Data Mining Using Reconfigurable Hardware: Approximate String Matching Qiong. Chamberlain, Ronald S. Indeck, Benjamin West, and Jason White, "Massively Parallel Data Mining Using

Chamberlain, Roger

Note: This page contains sample records for the topic "massive cement pour" 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

Computational studies of two-phase cement-CO2-brine interaction in wellbore environments  

SciTech Connect (OSTI)

Wellbore integrity is essential to ensuring long-term isolation of buoyant supercritical CO{sub 2} during geologic sequestration of CO{sub 2}. In this report, we summarize recent progress in numerical simulations of cement-brine-CO{sub 2} interactions with respect to migration of CO{sub 2} outside of casing. Using typical values for the hydrologic properties of cement, caprock (shale) and reservoir materials, we show that the capillary properties of good quality cement will prevent flow of CO{sub 2} into and through cement. Rather, CO{sub 2}, if present, is likely to be confined to the casing-cement or cement-formation interfaces. CO{sub 2} does react with the cement by diffusion from the interface into the cement, in which case it produces distinct carbonation fronts within the cement. This is consistent with observations of cement performance at the CO{sub 2}-enhanced oil recovery SACROC Unit in West Texas (Carey et al. 2007). For poor quality cement, flow through cement may occur and would produce a pattern of uniform carbonation without reaction fronts. We also consider an alternative explanation for cement carbonation reactions as due to CO{sub 2} derived from caprock. We show that carbonation reactions in cement are limited to surficial reactions when CO{sub 2} pressure is low (< 10 bars) as might be expected in many caprock environments. For the case of caprock overlying natural CO{sub 2} reservoirs for millions of years, we consider Scherer and Huet's (2009) hypothesis of diffusive steady-state between CO{sub 2} in the reservoir and in the caprock. We find that in this case, the aqueous CO{sub 2} concentration would differ little from the reservoir and would be expected to produce carbonation reaction fronts in cements that are relatively uniform as a function of depth.

Carey, James William [Los Alamos National Laboratory; Lichtner, Peter C [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

142

'The Overriding Demand for Energy Conservation in the Cement Industry' An Update  

E-Print Network [OSTI]

addi tives. While cement makes up only about 7 to 15 percent of the weight of concrete, it is 1:5y far the greatest contributor of energy content in the mixture. Cement, usually portland cement, is a product derived from pyro-processing calcareous... and argillaceous materials such as limestone and clay or shale into an intermediate fused material called clinker, which is subse quently ground together with a small amount of gypsum. Portland cement is the principal material produced by the U. S. cement...

Spellman, L. U.

1981-01-01T23:59:59.000Z

143

Cement fatigue and HPHT well integrity with application to life of well prediction  

E-Print Network [OSTI]

to the cyclic loading and few data sets may not be sufficient to give an adequate description of cement behavior under fatigue loading. Studies were conducted by Kim and Kim 2 on the fatigue behavior of high strength concrete using a type I Portland cement....3: Comparison of Max Stress Levels to Number of Cycles for Different Cement Strengths [2] Antrim 3 conducted fatigue studies on hardened ordinary Portland (type I) cement paste using 2 specimens; one with a high-water cement ratio of 0.7 and another...

Ugwu, Ignatius Obinna

2009-05-15T23:59:59.000Z

144

Westinghouse Cementation Facility of Solid Waste Treatment System - 13503  

SciTech Connect (OSTI)

During NPP operation, several waste streams are generated, caused by different technical and physical processes. Besides others, liquid waste represents one of the major types of waste. Depending on national regulation for storage and disposal of radioactive waste, solidification can be one specific requirement. To accommodate the global request for waste treatment systems Westinghouse developed several specific treatment processes for the different types of waste. In the period of 2006 to 2008 Westinghouse awarded several contracts for the design and delivery of waste treatment systems related to the latest CPR-1000 nuclear power plants. One of these contracts contains the delivery of four Cementation Facilities for waste treatment, s.c. 'Follow on Cementations' dedicated to three locations, HongYanHe, NingDe and YangJiang, of new CPR-1000 nuclear power stations in the People's Republic of China. Previously, Westinghouse delivered a similar cementation facility to the CPR-1000 plant LingAo II, in Daya Bay, PR China. This plant already passed the hot functioning tests successfully in June 2012 and is now ready and released for regular operation. The 'Follow on plants' are designed to package three 'typical' kind of radioactive waste: evaporator concentrates, spent resins and filter cartridges. The purpose of this paper is to provide an overview on the Westinghouse experience to design and execution of cementation facilities. (authors)

Jacobs, Torsten; Aign, Joerg [Westinghouse Electric Germany GmbH, Global Waste Management, Tarpenring 6, D- 22419 Hamburg (Germany)] [Westinghouse Electric Germany GmbH, Global Waste Management, Tarpenring 6, D- 22419 Hamburg (Germany)

2013-07-01T23:59:59.000Z

145

Development of Bulk Nanocrystalline Cemented Tungsten Carbide for Industrial Applicaitons  

SciTech Connect (OSTI)

This report contains detailed information of the research program entitled "Development of Bulk Nanocrystalline Cemented Tungsten Carbide Materials for Industrial Applications". The report include the processes that were developed for producing nanosized WC/Co composite powders, and an ultrahigh pressure rapid hot consolidation process for sintering of nanosized powders. The mechanical properties of consolidated materials using the nanosized powders are also reported.

Z. Zak Fang, H. Y. Sohn

2009-03-10T23:59:59.000Z

146

Automated Assessment of Polyethylene Wear in Cemented Acetabular Components using  

E-Print Network [OSTI]

Automated Assessment of Polyethylene Wear in Cemented Acetabular Components using Anteroposterior, Ninewells Hospital, Dundee, DD1 9SY, UK Abstract Polyethylene wear in the acetabular components of hip to the polyethylene acetabular component of a prosthesis so that both it and the metal femoral head component can

St Andrews, University of

147

COMPOSITE PORTLAND CEMENT CONCRETE PAVEMENTS (Tollway) Effective: January 30, 2012  

E-Print Network [OSTI]

COMPOSITE PORTLAND CEMENT CONCRETE PAVEMENTS (Tollway) Effective: January 30, 2012 Revised: May 8 for special applications to composite pavements as shown and described on the Drawings and in this Special as required; 5. Constructing the composite pavement on a prepared subgrade, or subbase, without forms. 6

148

Leaching induced concentration profiles in the solid phase of cement  

SciTech Connect (OSTI)

Analysis of the solid phase of portland cement specimens by energy dispersive x-ray spectrometry before and after leaching provided elemental profiles within the cement. Releases of potassium were calculated from the solid phase profiles and were compared to releases determined from leachate analyses of potassium and cesium-137. The fraction of potassium released in the leachate was found to correlate closely to that of cesium-137 under varying time and temperature conditions, despite the different manner in which each was originally contained in the cement. Agreement was obtained among potassium releases as determined from the solid, potassium in the leachate and cesium-137 in the leachate. These correlations allowed the use of potassium as an analog for cesium-137 in cement. Profiles of potassium in the solid showed varying degrees of depletion. A specimen, sectioned immediately after leaching for 471 days, showed complete removal of potassium to 9 mm depth from the specimens surface. From 9 mm to the center of the specimen, an apparently linear increase in concentration was observed. Specimens that had been air dried prior to sectioning had profiles that were produced by evaporative transport of dissolved species toward the surface. Carbonation of the surface appears to have retarded migration of the dissolved material. This prevented it from reaching the outer edge and resulted in increased potassium concentrations several mm inside the surface. 9 refs., 10 figs., 2 tabs.

Fuhrmann, M.; Colombo, P.

1987-04-01T23:59:59.000Z

149

India's cement industry: Productivity, energy efficiency and carbon emissions  

SciTech Connect (OSTI)

Historical estimates of productivity growth in India's cement sector vary from indicating an improvement to a decline in the sector's productivity. The variance may be traced to the time period of study, source of data for analysis, and type of indices and econometric specifications used for reporting productivity growth. Analysis shows that in the twenty year period, 1973 to 1993, productivity in the aluminum sector increased by 0.8% per annum. An econometric analysis reveals that technical progress in India's cement sector has been biased towards the use of energy and capital, while it has been material and labor saving. The increase in productivity was mainly driven by a period of progress between 1983 and 1991 following partial decontrol of the cement sector in 1982. The authors examine the current changes in structure and energy efficiency in the sector. Their analysis shows that the Indian cement sector is moving towards world-best technology, which will result in fewer carbon emissions and more efficient energy use. However, substantial further energy savings and carbon reduction potentials still exist.

Schumacher, Katja; Sathaye, Jayant

1999-07-01T23:59:59.000Z

150

Surface effects of cement-based solidified waste forms  

E-Print Network [OSTI]

This study was performed in order to determine-nine if the surface characteristics of cement-based waste forms were different than those of the bulk material. This was done as a prelude to the potential development of an accelerated leach test...

Pavlonnis, George

1998-01-01T23:59:59.000Z

151

Regional distribution of diagenetic carbonate cement in Palaeocene deepwater  

E-Print Network [OSTI]

0QF, UK (Received 9 June 1998; revised 15 March 1999) ABSTRACT: Sandstones of the Palaeocene al., 1993), and by inorganic thermal breakdown of organic material at depths >1.5 km (Irwin et al., 1977). Within the Rannoch Formation of the Brent Group, sandstones contain >5% carbonate cement

Haszeldine, Stuart

152

Contact Mechanics Based Mechanical Characterization of Portland Cement Paste  

E-Print Network [OSTI]

that the calcium silicate hydrate (C-S-H) phase of hydrated portland cement has different properties on the nanometric scale than on the micron scale. Packing density of C-S-H particles is proposed as an explanation for the disparity in the measured results...

Jones, Christopher

2012-02-14T23:59:59.000Z

153

Study of composite cement containing burned oil shale  

E-Print Network [OSTI]

Study of composite cement containing burned oil shale Julien Ston Supervisors : Prof. Karen properties. SCMs can be by-products from various industries or of natural origin, such as shale. Oil shale correctly, give a material with some cementitious properties known as burned oil shale (BOS). This study

Dalang, Robert C.

154

More durable roof coverings such as steel and fiber cement  

E-Print Network [OSTI]

- heating equipment saves money. Tankless water heaters provide hot water on demand at a preset temperature- cement siding is termite- and water-resistant and warrantied to last 50 years. Increasing the amount natural daylighting. Xeriscaping, or using native plants, significantly reduces the need for watering

155

SYNCHROTRON X-RAY MICROTOMOGRAPHY, ELECTRON PROBE MICROANALYSIS, AND NMR OF TOLUENE WASTE IN CEMENT.  

SciTech Connect (OSTI)

Synchrotron X-ray microtomography shows vesicular structures for toluene/cement mixtures, prepared with 1.22 to 3.58 wt% toluene. Three-dimensional imaging of the cured samples shows spherical vesicles, with diameters ranging from 20 to 250 {micro}m; a search with EPMA for vesicles in the range of 1-20 {micro}m proved negative. However, the total vesicle volume, as computed from the microtomography images, accounts for less than 10% of initial toluene. Since the cements were cured in sealed bottles, the larger portion of toluene must be dispersed within the cement matrix. Evidence for toluene in the cement matrix comes from {sup 29}Si MAS NMR spectroscopy, which shows a reduction in chain silicates with added toluene. Also, {sup 2}H NMR of d{sub 8}-toluene/cement samples shows high mobility for all, toluene and thus no toluene/cement binding. A model that accounts for all observations follows: For loadings below about 3 wt%, most toluene is dispersed in the cement matrix, with a small fraction of the initial toluene phase separating from the cement paste and forming vesicular structures that are preserved in the cured cement. Furthermore, at loadings above 3 wt%, the abundance of vesicles formed during toluene/cement paste mixing leads to macroscopic phase separation (most toluene floats to the surface of the cement paste).

BUTLER,L.G.

1999-07-22T23:59:59.000Z

156

au cern pour: Topics by E-print Network  

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

de leur systme : un jeu de rles pour des projets collectifs d'irrigation au Tadla (Maroc) Physics Websites Summary: collectifs d'irrigation au Tadla (Maroc) M. Dionnet1, M....

157

au fdg pour: Topics by E-print Network  

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

de leur systme : un jeu de rles pour des projets collectifs d'irrigation au Tadla (Maroc) Physics Websites Summary: collectifs d'irrigation au Tadla (Maroc) M. Dionnet1, M....

158

TILT POUR TRIALS AND ANALYSIS Bob Bryant1  

E-Print Network [OSTI]

TILT POUR TRIALS AND ANALYSIS Bob Bryant1 , Kent D. Carlson2 , Shouzhu Ou2 , Christoph Beckermann2 reduce inclusion severity, compared to standard techniques. Bryant, R., Carlson, K.D., Ou, S

Beckermann, Christoph

159

Une formule de Bouchet pour un manteau neigeux clairseme ?  

E-Print Network [OSTI]

l'´evapotranspiration (mod`ele "advection aridity" Brutsaert et Stricker, 1979; Parlange et Katul concept d'advection (Brutsaert et Stricker, 1979), ce qui signifie que l'´energie non utilis´ee pour l

Paris-Sud XI, Université de

160

application lentilles pour: Topics by E-print Network  

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

sur l'ensemble de ces terminaux mobiles via des plus tt pour un maximum de smart- phones, quel que soit leur systme d'exploitation (iPhone, Android Paris-Sud XI,...

Note: This page contains sample records for the topic "massive cement pour" 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

Ghabezloo et al.: Poromechanical behaviour of hardened cement paste under isotropic loading Poromechanical behaviour of hardened cement paste  

E-Print Network [OSTI]

of the material is described in the framework of the mechanics of porous media. The poroelastic parameters the framework of the theory of porous media. Keywords: hardened cement paste, poromechanics, effective stress and Concrete Research, DOI 10.1016/j.cemconres.2008.06.007 * Corresponding Author : CERMES, Ecole Nationale des

Boyer, Edmond

162

Binary Capture Rates for Massive Protostars  

E-Print Network [OSTI]

The high multiplicity of massive stars in dense, young clusters is established early in their evolution. The mechanism behind this remains unresolved. Recent results suggest that massive protostars may capture companions through disk interactions with much higher efficiency than their solar mass counterparts. However, this conclusion is based on analytic determinations of capture rates and estimates of the robustness of the resulting binaries. We present the results of coupled n-body and SPH simulations of star-disk encounters to further test the idea that disk-captured binaries contribute to the observed multiplicity of massive stars.

Nickolas Moeckel; John Bally

2007-04-09T23:59:59.000Z

163

Interprte/orateur : pour le meilleur et pour le pire Elsa Yazbek Charabati  

E-Print Network [OSTI]

est là, là-bas : donc présent, en cabine ; et dans le noir, c'est à dire dans les coulisses. Il est là pour transmettre les paroles de l'orateur dans une autre langue. Il est là-bas, dans les coulisses dans l'oreille d'une grande célébrité, il est là ou là-bas, mais on ne le voit pas. Sans l'orateur, l

Boyer, Edmond

164

Opportunities for Energy Efficiency and Demand Response in the California Cement Industry  

SciTech Connect (OSTI)

This study examines the characteristics of cement plants and their ability to shed or shift load to participate in demand response (DR). Relevant factors investigated include the various equipment and processes used to make cement, the operational limitations cement plants are subject to, and the quantities and sources of energy used in the cement-making process. Opportunities for energy efficiency improvements are also reviewed. The results suggest that cement plants are good candidates for DR participation. The cement industry consumes over 400 trillion Btu of energy annually in the United States, and consumes over 150 MW of electricity in California alone. The chemical reactions required to make cement occur only in the cement kiln, and intermediate products are routinely stored between processing stages without negative effects. Cement plants also operate continuously for months at a time between shutdowns, allowing flexibility in operational scheduling. In addition, several examples of cement plants altering their electricity consumption based on utility incentives are discussed. Further study is needed to determine the practical potential for automated demand response (Auto-DR) and to investigate the magnitude and shape of achievable sheds and shifts.

Olsen, Daniel; Goli, Sasank; Faulkner, David; McKane, Aimee

2010-12-22T23:59:59.000Z

165

Casimir Pistons for Massive Scalar Fields  

E-Print Network [OSTI]

The Casimir force on two-dimensional pistons for massive scalar fields with both Dirichlet and hybrid boundary conditions is computed. The physical result is obtained by making use of generalized $\\zeta$-function regularization technique. The influence of the mass and the position of the piston in the force is studied graphically. The Casimir force for massive scalar field is compared to that for massless scalar field.

Xiang-hua Zhai; Yan-yan Zhang; Xin-zhou Li

2008-08-01T23:59:59.000Z

166

A Coupled Nanoindentation/SEM-EDS Study on Low Water/Cement Ratio Portland Cement Paste: Evidence for C-S-H/Ca(OH)[subscript 2] Nanocomposites  

E-Print Network [OSTI]

A low water/cement ratio (w/c=0.20) hydrated Portland cement paste was analyzed by grid-indentation coupled with ex situ scanning electron microscope-energy-dispersive X-ray spectra (SEM-EDS) analysis at each indentation ...

Chen, Jeffrey J.

167

Scanning probe microscopy: Sulfate minerals in scales and cements  

SciTech Connect (OSTI)

The principles of scanning probe microscopy (SPM) are illustrated with examples from oilfield mineralogy, particularly emphasizing sulfate minerals involved in scale formation and cement hydration chemistry. The topography of the (010) cleavage surface of gypsum observed by atomic force microscopy shows atomically flat terraces separated by shallow steps often only one unit cell high. SPM allows direct observation of processes on mineral surfaces while they are in contact with solutions. The dissolution etching and crystal growth of gypsum and barite are discussed and rates of step migration estimated. The orientation of steps is related to the crystallographic axes. The action of phosphonate crystal growth inhibitor on gypsum and of a chelating scale solvent on barite are also shown. The multiphase microstructure of an oilwell cement clinker is described in relation to its hydration chemistry in contact with water and its reaction with sulfate ions.

Hall, C. [Schlumberger Cambridge Research (United Kingdom)

1995-11-01T23:59:59.000Z

168

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

SciTech Connect (OSTI)

China's cement industry, which produced 1,388 million metric tons (Mt) of cement in 2008, accounts for almost half of the world's total cement production. Nearly 40% of China's cement production is from relatively obsolete vertical shaft kiln (VSK) cement plants, with the remainder from more modern rotary kiln cement plants, including plants equipped with new suspension pre-heater and pre-calciner (NSP) kilns. Shandong Province is the largest cement-producing Province in China, producing 10% of China's total cement output in 2008. This report documents an analysis of the potential to improve the energy efficiency of NSP kiln cement plants in Shandong Province. Sixteen NSP kiln cement plants were surveyed regarding their cement production, energy consumption, and current adoption of 34 energy-efficient technologies and measures. Plant energy use was compared to both domestic (Chinese) and international best practice using the Benchmarking and Energy Saving Tool for Cement (BEST-Cement). This benchmarking exercise indicated an average technical potential primary energy savings of 12% would be possible if the surveyed plants operated at domestic best practice levels in terms of energy use per ton of cement produced. Average technical potential primary energy savings of 23% would be realized if the plants operated at international best practice levels. Energy conservation supply curves for both fuel and electricity savings were then constructed for the 16 surveyed plants. Using the bottom-up electricity conservation supply curve model, the cost-effective electricity efficiency potential for the studied cement plants in 2008 is estimated to be 373 gigawatt hours (GWh), which accounts for 16% of total electricity use in the 16 surveyed cement plants in 2008. Total technical electricity-saving potential is 915 GWh, which accounts for 40% of total electricity use in the studied plants in 2008. The fuel conservation supply curve model shows the total technical fuel efficiency potential equal to 7,949 terajoules (TJ), accounting for 8% of total fuel used in the studied cement plants in 2008. All the fuel efficiency potential is shown to be cost effective. Carbon dioxide (CO{sub 2}) emission reduction potential associated with cost-effective electricity saving is 383 kiloton (kt) CO{sub 2}, while total technical potential for CO{sub 2} emission reduction from electricity-saving is 940 ktCO{sub 2}. The CO{sub 2} emission reduction potentials associated with fuel-saving potentials is 950 ktCO{sub 2}.

Price, Lynn; Hasanbeigi, Ali; Lu, Hongyou; Wang, Lan

2009-10-01T23:59:59.000Z

169

Extension and replacement of aspalt cement with sulphur  

E-Print Network [OSTI]

material containing bitumen, sulphur, and mineral matter such as sand, rock, road metal and clinker (41). He recommended preparing the mixture in hot mix plants, and completely filling the voids between aggregate particles with sulphur-asphalt binder... Selection . Aggregate Selection Selection of Asphalt Cement and Sulphur Content 10 13 20 23 23 26 27 28 28 28 33 44 PAGE Selection of Moisture Condition and Compaction Effort . 45 Processing of Sulphur-Asphalt Emulsion (SAE) Binders...

Pickett, Daniel Ernest

1977-01-01T23:59:59.000Z

170

Polymer-cement geothermal-well-completion materials. Final report  

SciTech Connect (OSTI)

A program to develop high-temperature polymer cements was performed. Several formulations based on organic and semi-inorganic binders were evaluated on the basis of mechanical and thermal stability, and thickening time. Two optimized systems exhibited properties exceeding those required for use in geothermal wells. Both systems were selected for continued evaluation at the National Bureau of Standards and contingent upon the results, for field testing in geothermal wells.

Zeldin, A.N.; Kukacka, L.E.

1980-07-01T23:59:59.000Z

171

INVESTIGATION OF WASTE GLASS POURING PROCESS OVER A KNIFE EDGE  

SciTech Connect (OSTI)

Vitrification is the process of capturing radioactive waste in glass. The Savannah River Site's (SRS) Defense Waste Processing Facility (DWPF) is one of the facilities using the vitrification technology to treat and immobilize radioactive waste. The objective of the project is to investigate the pouring behavior of molten glass over a pour spout knife edge. Experiments are run using simulant glass containing the same chemical formulation as the radioactive sludge glass, but without radioactive contaminants. The purpose of these tests is to obtain actual glass data that, when combined with previous cold data from other fluids, will provide an overall understanding of the physics of liquids flowing over a pour spout and knife edge, A specific objective is to verify computational fluid dynamics (CFD) models with a range of liquid data with particular emphasis on glass so as to provide confidence in use of these CFD models for designing a new improved pour spout for the DWPF melter. The work to be performed at FIU-HCET includes assembling the melting and pouring system that mimics the DWPF melter and determining the key parameters that may influence wicking. Information from the FIU-HCET melter tests will lead to better operating guidelines for the DWPF melter so as to avoid wicking. During FY98, a bench-scale melter complete with pour spout and a knife edge was designed and assembled at FIU-HCET. Initially, the system was tested with glycerine. Subsequently, glass provided by SRS was used for experimentation. Flow visualization tests were performed with the melter in FY98 to investigate the pouring behavior of molten glass over a pour spout model simulating a DWPF pour spout of the original design. Simulant glass containing the same chemical formulation as sludge glass but without radioactive contaminants was used in the tests. All the tasks and milestones mentioned in the PTP for the project were accomplished. The project completed its second year, and this document reports the tasks and milestones that were accomplished during the 1998 fiscal year.

M.A. Ebadian, Ph.D.

1999-01-01T23:59:59.000Z

172

Corrosion of aluminium metal in OPC- and CAC-based cement matrices  

SciTech Connect (OSTI)

Corrosion of aluminium metal in ordinary Portland cement (OPC) based pastes produces hydrogen gas and expansive reaction products causing problems for the encapsulation of aluminium containing nuclear wastes. Although corrosion of aluminium in cements has been long known, the extent of aluminium corrosion in the cement matrices and effects of such reaction on the cement phases are not well established. The present study investigates the corrosion reaction of aluminium in OPC, OPC-blast furnace slag (BFS) and calcium aluminate cement (CAC) based systems. The total amount of aluminium able to corrode in an OPC and 4:1 BFS:OPC system was determined, and the correlation between the amount of calcium hydroxide in the system and the reaction of aluminium obtained. It was also shown that a CAC-based system could offer a potential matrix to incorporate aluminium metal with a further reduction of pH by introduction of phosphate, producing a calcium phosphate cement.

Kinoshita, Hajime, E-mail: h.kinoshita@sheffield.ac.uk [Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield, S1 3JD (United Kingdom)] [Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield, S1 3JD (United Kingdom); Swift, Paul; Utton, Claire [Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield, S1 3JD (United Kingdom)] [Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield, S1 3JD (United Kingdom); Carro-Mateo, Beatriz [The Public University of Navarra, C/Esquíroz, 30 trasera, Pamplona 31007 (Spain)] [The Public University of Navarra, C/Esquíroz, 30 trasera, Pamplona 31007 (Spain); Marchand, Geraldine [The National Institute of Applied Sciences (INSA) Lyon, 20 Avenue Albert Einstein 69621 Villeurbanne Cedex (France)] [The National Institute of Applied Sciences (INSA) Lyon, 20 Avenue Albert Einstein 69621 Villeurbanne Cedex (France); Collier, Nick [National Nuclear Laboratory, Chadwick House, Birchwood Park, Warrington, WA3 6AE (United Kingdom)] [National Nuclear Laboratory, Chadwick House, Birchwood Park, Warrington, WA3 6AE (United Kingdom); Milestone, Neil [Industrial Research Ltd., 69 Gracefield Road, Lower Hutt, 5040 (New Zealand)] [Industrial Research Ltd., 69 Gracefield Road, Lower Hutt, 5040 (New Zealand)

2013-08-15T23:59:59.000Z

173

Prsente pour obtenir le grade de Docteur de l'Ecole polytechnique  

E-Print Network [OSTI]

(membre du Jury) et Stephane FIORILLO, représentants de la compagnie SILVACO International, pour leur

Paris-Sud XI, Université de

174

TD1 -Inversion tomographique A finir et rendre pour le 19 octobre 2012  

E-Print Network [OSTI]

´epertoire TP-SISMO dans votre espace informa- tique. · Tapez la commande: . gmt pour activer la visualisation

Demouchy, Sylvie

175

Potential Energy Savings and CO2 Emissions Reduction of China's Cement Industry  

E-Print Network [OSTI]

dioxide (CO2) emissions from fossil fuel combustion, as wellCO2 emissions (including cement process and fossil fuel combustion

Ke, Jing

2013-01-01T23:59:59.000Z

176

Microsoft Word - NETL-TRS-2-2013_Foamed Cement_20140124.docx  

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

Ultimately, this research will provide industry the knowledge to ensure long-term well integrity and safe operation of wells in which foamed cements are used. Computed...

177

E-Print Network 3.0 - ash blended cement Sample Search Results  

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

CLSM mixture utilized... . CHARACTERIZATION AND APPLICATION OF CLASS F FLY ASH AND CLEAN-COAL ASH FOR CEMENT-BASED MATERIALS 2 The major... investigation. Two additional ash ......

178

Policy Options for Encouraging Energy Efficiency Best Practices in Shandong Province's Cement Industry  

E-Print Network [OSTI]

Azure. Alternative Fuel Use in the Cement Sector in ShandongAlternative fuels ..6 Resource potential for alternative fuel use in Shandong

Price, Lynn

2013-01-01T23:59:59.000Z

179

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

Sustainable Development waste heat recovery World Wide FundTaishan Cement Works Waste Heat Recovery and Utilisation forPlant’s Low Temperature Waste Heat Power Generation Project.

Price, Lynn

2010-01-01T23:59:59.000Z

180

Potential Energy Savings and CO2 Emissions Reduction of China's Cement Industry  

E-Print Network [OSTI]

report of cement industry waste heat power generation. ChinaWorrell et al. , 2001). Waste heat recovery (WHR) poweradoption and utilization of waste heat recovery (WHR) power

Ke, Jing

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

Banerjee, R. , 2005. Energy Efficiency and Demand SideKiln Systems,” Energy Efficiency in the Cement Industry (Ed.for Improving Energy Efficiency, Reducing Pollution and

Price, Lynn

2010-01-01T23:59:59.000Z

182

Emerging Energy-efficiency and CO2 Emission-reduction Technologies for Cement and Concrete Production  

E-Print Network [OSTI]

2010. Cement and concrete nanoscience and nanotechnology.of 100 Percent Fly Ash Concrete. 2005 World of Coal Ash (carbon dioxide in precast concrete. TECHNOLOGY REVIEW – A

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

183

Emerging Energy-efficiency and CO2 Emission-reduction Technologies for Cement and Concrete Production  

E-Print Network [OSTI]

cement industry Oxygen enrichment technology Post-combustionOther Benefits: ? Oxygen enrichment technology reduces fuelprocess. Oxy-fuel technology uses oxygen instead of air in

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

184

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

of Demonstrated Energy Technologies (CADDET), Internationaland MAIN. 1993. Energy Technology in the Cement IndustrialAugust 19, 2009. Energy Technology Support Unit (ETSU).

Price, Lynn

2010-01-01T23:59:59.000Z

185

Estimation of CO2 Emissions from China's Cement Production: Methodologies and Uncertainties  

E-Print Network [OSTI]

L. , 2006. Discussion of CO2 emission reduction in ChineseFurther discussion of CO2 emission reduction in Chinesecalculation method of CO2 emissions of cement production.

Ke, Jing

2014-01-01T23:59:59.000Z

186

Quantifying the Co-benefits of Energy-Efficiency Programs: A Case Study of the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

ingredient in cement: vertical shaft kilns and rotary kilns.cement was produced by plants using outdated vertical shaft kilns (Vertical shaft kilns (Mt) Rotary (NSP + other) kilns (Mt) Clinker production (Mt) Clinker-cement

Hasanbeigi, Ali

2014-01-01T23:59:59.000Z

187

Le magn)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard  

E-Print Network [OSTI]

Le magné)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard Année 2013-14 Chaire Atomes et rayonnement Magné8sme ar8ficiel pour un atome isolé (I) #12;Simula8on du magné8sme avec des atomes neutres Le but : réaliser pour

Dalibard, Jean

188

Pour-point depression of crude oils by addition of tar sand bitumen  

SciTech Connect (OSTI)

A process is described for reducing the pour point of a crude oil which comprises adding a pour-point depressant selected from the group consisting of a raw tar sands bitumen and hydrotreated tar sands bitumen to form a blend possessing a relatively lower pour point.

Soderberg, D.J.

1988-03-01T23:59:59.000Z

189

SED modeling of Young Massive Stars  

E-Print Network [OSTI]

In this contribution, I review the applications and potential limitations of the spectral energy distribution fitting tool that I have developed, with a strong emphasis on the limits to which this tool can be used to improve our understanding of massive star formation. I discuss why our current grid of models cannot be used to distinguish between the several competing theories of massive star formation. I also discuss stellar mass determinations, artificial correlations between parameters in the grid of models, multiplicity, confusion, dust assumptions, and unique fits. I briefly review the improvements we intend to carry out for our next grid of models, which will eliminate many of these limitations. Finally, I show examples of applications of this tool to massive young stars.

Thomas P. Robitaille

2007-11-27T23:59:59.000Z

190

Imaging Wellbore Cement Degradation by Carbon Dioxide under Geologic Sequestration Conditions Using X?ray Computed Microtomography  

SciTech Connect (OSTI)

ABSTRACT: X-ray microtomography (XMT), a nondestructive three-dimensional imaging technique, was applied to demonstrate its capability to visualize the mineralogical alteration and microstructure changes in hydrated Portland cement exposed to carbon dioxide under geologic sequestration conditions. Steel coupons and basalt fragments were added to the cement paste in order to simulate cement-steel and cement-rock interfaces. XMT image analysis showed the changes of material density and porosity in the degradation front (density: 1.98 g/cm3, porosity: 40%) and the carbonated zone (density: 2.27 g/cm3, porosity: 23%) after reaction with CO2- saturated water for 5 months compared to unaltered cement (density: 2.15 g/cm3, porosity: 30%). Three-dimensional XMT imaging was capable of displaying spatially heterogeneous alteration in cement pores, calcium carbonate precipitation in cement cracks, and preferential cement alteration along the cement-steel and cement-rock interfaces. This result also indicates that the interface between cement and host rock or steel casing is likely more vulnerable to a CO2 attack than the cement matrix in a wellbore environment. It is shown here that XMT imaging can potentially provide a new insight into the physical and chemical degradation of wellbore cement by CO2 leakage.

Jung, Hun Bok; Jansik, Danielle P.; Um, Wooyong

2013-01-01T23:59:59.000Z

191

Primordial Li abundance and massive particles  

SciTech Connect (OSTI)

The problem of the observed lithium abundance coming from the Big Bang Nucleosynthesis is as of yet unsolved. One of the proposed solutions is including relic massive particles into the Big Bang Nucleosynthesis. We investigated the effects of such particles on {sup 4}HeX{sup -}+{sup 2}H{yields}{sup 6}Li+X{sup -}, where the X{sup -} is the negatively charged massive particle. We demonstrate the dominance of long-range part of the potential on the cross-section.

Latin-Capital-Letter-Eth apo, H. [Department of Physics, Akdeniz University, TR-07058, Antalya (Turkey)

2012-10-20T23:59:59.000Z

192

Energy Efficiency Improvement and Cost Saving Opportunities for Cement Making. An ENERGY STAR Guide for Energy and Plant Managers  

E-Print Network [OSTI]

B. , 1990. “Utilisation of Waste Heat from the Cement RotaryAdvanced Concepts of Waste Heat Recovery in Cement Plants”a roller mill. Utilizing waste heat from the kiln exhaust,

Worrell, Ernst

2008-01-01T23:59:59.000Z

193

M AERIAUXMAGNETIQUES POUR HYPERFREQUENCES THICK FERRITE FILMS BY CHEMICAL TRANSPORT  

E-Print Network [OSTI]

M AERIAUXMAGNETIQUES POUR HYPERFREQUENCES THICK FERRITE FILMS BY CHEMICAL TRANSPORT A. I. BRAGINSKI-Mn ferrite and ferrochrornite films by Chemical Transport Deposi- tion (CTD) [I, 21. This method properties obtained. CTD now appears to be a valuable tool in laboratory preparation of thick ferrite layers

Boyer, Edmond

194

VOLUTION DES FERRITES DOUX POUR TLCOMMUNICATIONS ET TLVISION  

E-Print Network [OSTI]

837 �VOLUTION DES FERRITES DOUX POUR T�L�COMMUNICATIONS ET T�L�VISION R. SIBILLE Directeur Technique de L. C. C. Division Ferrites (COFELEC) Thomson C. S. F., 74 Route de Savigny, 21204 Beaune deuxième guerre mondiale), les ferrites doux sont encore en pleine évolution et nombreux sont ceux qui leur

Boyer, Edmond

195

Makis Solomos POUR UNE APPROCHE ANALYTIQUE DES PHNOMNES  

E-Print Network [OSTI]

. Vaggione) Formel/Informel : musique- philosophie (Paris, L'Harmattan, 2003). Il a dirigé plusieurs livres collectifs : L'espace : musique-philosophie (avec J.M. Chouvel, Paris, L'Harmattan, 1998), La métaphore lumineuse. Xenakis-Grisey (Paris, L'Harmattan, 2003), Musiques, arts, technologies. Pour une approche

Paris-Sud XI, Université de

196

Explorer : des clés pour mieux comprendre la matière  

ScienceCinema (OSTI)

Le LHC va-t-il bouleverser les théories de l'infiniment petit ? Les physiciens aimeraient que l'accélérateur fasse trembler le modèle standard. Cette théorie des particules élémentaires et des forces laisse de nombreuses zones d'ombre. Le LHC et ses expériences ont été conçus pour les éclairer.

None

2011-10-06T23:59:59.000Z

197

Quel avenir hydraulique pour l'Egypte ? Mutin Georges  

E-Print Network [OSTI]

Quel avenir hydraulique pour l'Egypte ? Mutin Georges Sommaire · Un barrage insuffisant · Egypte et pays d'amont : les positions en présence · Une meilleure gestion des eaux s'impose à l'Egypte Texte intégral Depuis plusieurs décennies, l'Egypte doit faire face à un redoutable défi : nourrir une population

Paris-Sud XI, Université de

198

Activit bolomtres pour le 30m Pico Veleta  

E-Print Network [OSTI]

Activité bolomètres pour le 30m à Pico Veleta Samuel Leclercq Journal-club IRAM 13/06/07 #12;Menu = puissance si faible que plusieurs sources apparaissent au même endroit · Bruit thermodynamique (Johnson

Leclercq, Samuel

199

LA BOITE A MOUSTACHES POUR SENSIBILISER A LA STATISTIQUE  

E-Print Network [OSTI]

boîte à moustaches une traduction de Box & Whiskers Plot, est une invention de TUKEY (1977) pour, Interactivité, Visualisation, Analyse Exploratoire des Données, AED, J. W. TUKEY, Boîte à moustaches. Keys Words : Statistics Education, Interactivity, Visualization, Exploratory Data Analysis, EDA, J. W. TUKEY, Box

Boyer, Edmond

200

Par Sophie Rodrigue Pour Gabriel Blouin-Demers  

E-Print Network [OSTI]

dans le sol de l'épandange de fertilisants phosphatés · �valuer la contamination radioactive de l · Contamination radioactive potentielle de la chaîne alimentaire et de l'eau souterraine · RecommendationsPar Sophie Rodrigue EVS4904 Pour Gabriel Blouin-Demers http://www.bccdc.org/images/site/rps/radioactivity

Blouin-Demers, Gabriel

Note: This page contains sample records for the topic "massive cement pour" 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

Sulfur polymer cement for macroencapsulation of mixed waste debris  

SciTech Connect (OSTI)

In FY 1997, the US DOE Mixed Waste Focus Area (MWFA) sponsored a demonstration of the macroencapsulation of mixed waste debris using sulfur polymer cement (SPC). Two mixed wastes were tested--a D006 waste comprised of sheets of cadmium and a D008/D009 waste comprised of lead pipes and joints contaminated with mercury. The demonstration was successful in rendering these wastes compliant with Land Disposal Restrictions (LDR), thereby eliminating one Mixed Waste Inventory Report (MWIR) waste stream from the national inventory.

Mattus, C.H.

1998-06-01T23:59:59.000Z

202

New Candidate Massive Clusters from 2MASS  

E-Print Network [OSTI]

Massive stars are important for the evolution of the interstellar medium. The detailed study of their properties (such as mass loss, rotation, magnetic fields) is enormously facilitated by samples of these objects in young massive galactic star clusters. Using 2MASS we have searched for so far unknown candidates of red supergiant clusters along the Galactic Plane. Utilising deep high resolution UKIDSS GPS and VISTA VVV data to study colour-magnitude diagrams, we uncover six new massive cluster candidates in the inner Galaxy. If spectroscopically confirmed as real clusters, two of them could be part of the Scutum-Complex. One cluster candidate has a number of potential red supergiant members comparable to RSGC1 and 3. Our investigation of UKIDSS data reveals for the first time the main sequence of the massive cluster RSGC2. The stars of the sequence show an increased projected density at the same position as the known red supergiants in the cluster and have E(J-K)=1.6mag. This either indicates an unusual extin...

Froebrich, D

2013-01-01T23:59:59.000Z

203

The Tunnel Vision Syndrome: Massively Delaying Progress  

E-Print Network [OSTI]

The Tunnel Vision Syndrome: Massively Delaying Progress Reiner Hartenstein, Professor, IEEE fellow facet as the complete answer are far from solving the problem. What is the reason of these slow-down- stream-based computing was delayed for decades by the tunnel vision syndrome. The History of Systolic

Hartenstein, Reiner

204

Beta Functions of Topologically Massive Supergravity  

E-Print Network [OSTI]

We compute the one-loop beta functions of the cosmological constant, Newton's constant and the topological mass in topologically massive supergravity in three dimensions. We use a variant of the proper time method supplemented by a simple choice of cutoff function. We find that the dimensionless coefficient of the Chern-Simons term, $\

R. Percacci; M. J. Perry; C. N. Pope; E. Sezgin

2013-02-20T23:59:59.000Z

205

Is the Human Mind Massively Modular?  

E-Print Network [OSTI]

CHAPTER T H R E E Is the Human Mind Massively Modular? Richard Samuels Introduction: Minds as Mechanisms Among the most pervasive and fundamental assumptions in cognitive science is that the human mind (or mind-brain) is a mechanism of some sort: a physical device com- posed of functionally specifiable

Samuels, Richard

206

Corrosion of Metals in Composite Cements Anthony Setiadi*, J. Hill and N. B. Milestone  

E-Print Network [OSTI]

Corrosion of Metals in Composite Cements Anthony Setiadi*, J. Hill and N. B. Milestone. However, there may be issues regarding the corrosion of some of the metal components which arise from reprocessing and decommissioning due to the alkaline environment in the cement grouts. The corrosion

Sheffield, University of

207

Speciation of heavy metals in cement-stabilized waste forms: A micro-spectroscopic study  

E-Print Network [OSTI]

-ray fluorescence (XRF)) were used to investigate Co and Ni uptake by Hardened Cement Paste (HCP) with the aim. For Ni and Co, XRF mapping revealed a highly heterogeneous element distribution as far Elsevier B.V. All rights reserved. Keywords: Cement; Micro-XAS; Micro-XRF mapping; Ni; Co 1. Introduction

208

Carbon 39 (2001) 19952001 Silane-treated carbon fiber for reinforcing cement  

E-Print Network [OSTI]

Carbon 39 (2001) 1995­2001 Silane-treated carbon fiber for reinforcing cement *Yunsheng Xu, D-treated carbon fibers and silane-treated silica fume, relative to the values for cement paste with as-received carbon fibers and as-received silica fume. Silane treatment of fibers and silica fume contributed about

Chung, Deborah D.L.

209

The Effect of Cement Mechanical Properties and Reservoir Compaction on HPHT Well Integrity  

E-Print Network [OSTI]

Cement high- cycle fatigue failure constant B Cement high -cycle fatigue failure constant C Rock internal strength, psi Cr Volumetric solid...-grain compressibility, psi-1 Cbc Volumetric bulk-volume compressibility, psi-1 E Young?s modulus, psi F Critical force, lbf G...

Yuan, Zhaoguang

2012-11-15T23:59:59.000Z

210

Using artificial neural networks to predict the quality and performance of oilfield cements  

SciTech Connect (OSTI)

Inherent batch to batch variability, ageing and contamination are major factors contributing to variability in oilfield cement slurry performance. Of particular concern are problems encountered when a slurry is formulated with one cement sample and used with a batch having different properties. Such variability imposes a heavy burden on performance testing and is often a major factor in operational failure. We describe methods which allow the identification, characterization and prediction of the variability of oilfield cements. Our approach involves predicting cement compositions, particle size distributions and thickening time curves from the diffuse reflectance infrared Fourier transform spectrum of neat cement powders. Predictions make use of artificial neural networks. Slurry formulation thickening times can be predicted with uncertainties of less than {+-}10%. Composition and particle size distributions can be predicted with uncertainties a little greater than measurement error but general trends and differences between cements can be determined reliably. Our research shows that many key cement properties are captured within the Fourier transform infrared spectra of cement powders and can be predicted from these spectra using suitable neural network techniques. Several case studies are given to emphasize the use of these techniques which provide the basis for a valuable quality control tool now finding commercial use in the oilfield.

Coveney, P.V.; Hughes, T.L. [Schlumberger Cambridge Research Ltd., Cambridge (United Kingdom); Fletcher, P. [Schlumberger Dowell, Skene, Aberdeen (United Kingdom)

1996-12-31T23:59:59.000Z

211

Portland cement for SO/sub 2/ control in coal-fired power plants  

DOE Patents [OSTI]

A method is described for removing oxides of sulfur from the emissions of fossil fuel combustion by injecting portland cement into the boiler with the fuel, the combustion air, or downstream with the combustion gases. The cement products that result from this method is also described. 1 tab.

Steinberg, M.

1984-10-17T23:59:59.000Z

212

Portland cement for SO.sub.2 control in coal-fired power plants  

DOE Patents [OSTI]

There is described a method of removing oxides of sulfur from the emissions of fossil fuel combustion by injecting portland cement into the boiler with the fuel, the combustion air, or downstream with the combustion gases. There is also described the cement products that result from this method.

Steinberg, Meyer (Melville, NY)

1985-01-01T23:59:59.000Z

213

Thermal Energy Storage/Waste Heat Recovery Applications in the Cement Industry  

E-Print Network [OSTI]

, and the Portland Cement Association have studied the potential benefits of using waste heat recovery methods and thermal energy storage systems in the cement manufacturing process. This work was performed under DOE Contract No. EC-77-C-01-50S4. The study has been...

Beshore, D. G.; Jaeger, F. A.; Gartner, E. M.

1979-01-01T23:59:59.000Z

214

Z .Chemical Geology 152 1998 227256 The thermal and cementation histories of a sandstone petroleum  

E-Print Network [OSTI]

Z .Chemical Geology 152 1998 227­256 The thermal and cementation histories of a sandstone petroleum-feldspars recovered at various depths from a deep well drilled through a carbonate-cemented sandstone petroleum of a sandstone petroleum xreservoir, Elk Hills, California. Part 2: In situ oxygen and carbon isotopic results

215

Impact of Hydrated Cement Paste Quality and Entrained Air-Void  

E-Print Network [OSTI]

Impact of Hydrated Cement Paste Quality and Entrained Air-Void System on the Durability of Concrete the characteristics of the entrained air-void system #12;Objectives · Review the current accepted relationship between is affected by the quality of the hydrated cement paste (HCP) and the presence of a properly entrained air

216

Long-term modeling of glass waste in portland cement- and clay-based matrices  

SciTech Connect (OSTI)

A set of ``templates`` was developed for modeling waste glass interactions with cement-based and clay-based matrices. The templates consist of a modified thermodynamic database, and input files for the EQ3/6 reaction path code, containing embedded rate models and compositions for waste glass, cement, and several pozzolanic materials. Significant modifications were made in the thermodynamic data for Th, Pb, Ra, Ba, cement phases, and aqueous silica species. It was found that the cement-containing matrices could increase glass corrosion rates by several orders of magnitude (over matrixless or clay matrix systems), but they also offered the lowest overall solubility for Pb, Ra, Th and U. Addition of pozzolans to cement decreased calculated glass corrosion rates by up to a factor of 30. It is shown that with current modeling capabilities, the ``affinity effect`` cannot be trusted to passivate glass if nuclei are available for precipitation of secondary phases that reduce silica activity.

Stockman, H.W.; Nagy, K.L. [Sandia National Labs., Albuquerque, NM (United States); Morris, C.E. [Wollongong Univ., NSW (Australia). Dept. of Civil and Mining Engineering

1995-12-01T23:59:59.000Z

217

Comparative analysis of the life cycle impact assessment of available cement inventories in the EU  

SciTech Connect (OSTI)

Life cycle impact assessment (LCIA) is one of basic steps in life cycle assessment methodology (LCA). This paper presents a comparative study of the LCIA of different life cycle inventories (LCI) for EU cements. The analysis unit used is the manufacture of 1 kg of cement, from 'cradle to gate'. The impact categories considered are those resulting from the manufacture of cement and include greenhouse effects, acidification, eutrophication and summer and winter smog, amongst others. The results of the study highlighted some inconsistencies in existing inventories. As for the LCIA, the main environmental interventions related to cement manufacture were classified and characterised and their effect on different impact categories analysed. Differences observed in evaluation of the impact of cement type were essentially related to their clinker content.

Josa, Alejandro [Technical University of Catalonia (UPC), School of Civil Engineering (ETSECCPB), C/Jordi Girona 1-3 Modul D2/C1, Barcelona 08034 (Spain)]. E-mail: alejandro.josa@upc.edu; Aguado, Antonio [Technical University of Catalonia (UPC), School of Civil Engineering (ETSECCPB), C/Jordi Girona 1-3 Modul D2/C1, Barcelona 08034 (Spain); Cardim, Arnaldo [Civil Engineering Department, Polytechnic School of Penambuco University, Rua Benfica, 455-Madalena, CEP 50.750-410 (Brazil); Byars, Ewan [Centre for Cement and Concrete, Department of Civil and Structural Engineering, University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD (United Kingdom)

2007-05-15T23:59:59.000Z

218

Hydration and leaching characteristics of cement pastes made from electroplating sludge  

SciTech Connect (OSTI)

The purpose of this study was to investigate the hydration and leaching characteristics of the pastes of belite-rich cements made from electroplating sludge. The compressive strength of the pastes cured for 1, 3, 7, 28, and 90 days was determined, and the condensation of silicate anions in hydrates was examined with the {sup 29}Si nuclear magnetic resonance (NMR) technology. The leachabilities of the electroplating sludge and the hardened pastes were studied with the multiple toxicity characteristic leaching procedure (MTCLP) and the tank leaching test (NEN 7345), respectively. The results showed that the electroplating sludge continued to leach heavy metals, including nickel, copper, and zinc, and posed a serious threat to the environment. The belite-rich cement made from the electroplating sludge was abundant in hydraulic {beta}-dicalcium silicate, and it performed well with regard to compressive-strength development when properly blended with ordinary Portland cements. The blended cement containing up to 40% the belite-rich cement can still satisfy the compressive-strength requirements of ASTM standards, and the pastes cured for 90 days had comparable compressive strength to an ordinary Portland cement paste. It was also found that the later hydration reaction of the blended cements was relatively more active, and high fractions of belite-rich cement increased the chain length of silicate hydrates. In addition, by converting the sludge into belite-rich cements, the heavy metals became stable in the hardened cement pastes. This study thus indicates a viable alternative approach to dealing with heavy metal bearing wastes, and the resulting products show good compressive strength and heavy-metal stability.

Chen, Ying-Liang [Department of Environmental Engineering, National Cheng Kung University, No. 1, University Rd., Tainan City 70101, Taiwan (China); Sustainable Environment Research Center, National Cheng Kung University, No. 1, University Rd., Tainan City 70101, Taiwan (China); Ko, Ming-Sheng [Institute of Mineral Resources Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chunghsiao E. Rd., Taipei City 10608, Taiwan (China); Lai, Yi-Chieh [Department of Bioenvironmental Engineering, Chung Yuan Christian University, No. 200, Chung-Pei Rd., Chung-Li 32023, Taiwan (China); Chang, Juu-En, E-mail: juuen@mail.ncku.edu.tw [Department of Environmental Engineering, National Cheng Kung University, No. 1, University Rd., Tainan City 70101, Taiwan (China); Sustainable Environment Research Center, National Cheng Kung University, No. 1, University Rd., Tainan City 70101, Taiwan (China)

2011-06-15T23:59:59.000Z

219

Dynamic Evolution of Cement Composition and Transport Properties under Conditions Relevant to Geological Carbon Sequestration  

SciTech Connect (OSTI)

Assessing the possibility of CO{sub 2} leakage is one of the major challenges for geological carbon sequestration. Injected CO{sub 2} can react with wellbore cement, which can potentially change cement composition and transport properties. In this work, we develop a reactive transport model based on experimental observations to understand and predict the property evolution of cement in direct contact with CO{sub 2}-saturated brine under diffusion-controlled conditions. The model reproduced the observed zones of portlandite depletion and calcite formation. Cement alteration is initially fast and slows down at later times. This work also quantified the role of initial cement properties, in particular the ratio of the initial portlandite content to porosity (defined here as ?), in determining the evolution of cement properties. Portlandite-rich cement with large ? values results in a localized “sharp” reactive diffusive front characterized by calcite precipitation, leading to significant porosity reduction, which eventually clogs the pore space and prevents further acid penetration. Severe degradation occurs at the cement–brine interface with large ? values. This alteration increases effective permeability by orders of magnitude for fluids that preferentially flow through the degraded zone. The significant porosity decrease in the calcite zone also leads to orders of magnitude decrease in effective permeability, where fluids flow through the low-permeability calcite zone. The developed reactive transport model provides a valuable tool to link cement–CO{sub 2} reactions with the evolution of porosity and permeability. It can be used to quantify and predict long-term wellbore cement behavior and can facilitate the risk assessment associated with geological CO{sub 2} sequestration.

Brunet, Jean-Patrick Leopold; Li, Li; Karpyn, Zuleima T.; Strazisar, Brian; Bromhal Grant

2013-08-01T23:59:59.000Z

220

VALIDATION OF MASSIVELY PARALLEL SIMULATIONS OF DYNAMIC FRACTURE AND  

E-Print Network [OSTI]

VALIDATION OF MASSIVELY PARALLEL SIMULATIONS OF DYNAMIC FRACTURE AND FRAGMENTATION OF BRITTLE element simulations of dynamic fracture and fragmentation of brittle solids are presented. Fracture the results of massively parallel numerical simulations of dynamic fracture and fragmentation in brittle

Barr, Al

Note: This page contains sample records for the topic "massive cement pour" 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

Hydration studies of calcium sulfoaluminate cements blended with fly ash  

SciTech Connect (OSTI)

The main objective of this work is to study the hydration and properties of calcium sulfoaluminate cement pastes blended with fly ash (FA) and the corresponding mortars at different hydration ages. Laboratory X-ray powder diffraction, rheological studies, thermal analysis, porosimetry and compressive strength measurements were performed. The analysis of the diffraction data by Rietveld method allowed quantifying crystalline phases and overall amorphous contents. The studied parameters were: i) FA content, 0, 15 and 30 wt.%; and ii) water addition, water-to-CSA mass ratio (w/CSA = 0.50 and 0.65), and water-to-binder mass ratio (w/b = 0.50). Finally, compressive strengths after 6 months of 0 and 15 wt.% FA [w/CSA = 0.50] mortars were similar: 73 ± 2 and 72 ± 3 MPa, respectively. This is justified by the filler effect of the FA as no strong evidences of reactivity of FA with CSA were observed. These results support the partial substitution of CSA cements with FA with the economic and environmental benefits.

García-Maté, M.; De la Torre, A.G. [Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga (Spain)] [Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga (Spain); León-Reina, L. [Servicios Centrales de Apoyo a la Investigación, Universidad de Málaga, 29071 Málaga (Spain)] [Servicios Centrales de Apoyo a la Investigación, Universidad de Málaga, 29071 Málaga (Spain); Aranda, M.A.G. [Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga (Spain) [Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga (Spain); CELLS-Alba synchrotron, Carretera BP 1413, Km. 3.3, E-08290 Cerdanyola, Barcelona (Spain); Santacruz, I., E-mail: isantacruz@uma.es [Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga (Spain)

2013-12-15T23:59:59.000Z

222

Acceptable approaches for beneficial use of cement kiln dust  

SciTech Connect (OSTI)

One beneficial use of cement kiln dust (CKD) is application of CKD to cropland as agricultural lime or fertilizer. However, the EPA has expressed a concern over land application of CKD when the metals constituents in the CKD are above the industry-wide median levels presented in EPA`s Report to Congress on Cement Kiln Dust. Under the Clean Water Act, EPA has established limits for metals concentrations in sewage sludge that is applied to the land for beneficial use of the nitrogen in the sludge. The limits for land application of sewage sludge were established based on the results of exposure risk assessments. A comparison of the median industry-wide metals concentrations in CKD to the metals concentration limits for land application of sewage sludge indicates that all trace metal concentrations IN CKD are below the corresponding sewage sludge land application limit, with the exception of the median level of arsenic from one data set. EPA has determined that land application of CKD with metals concentration limits at or below the industry-wide median concentrations does not pose a significant human cancer or non-cancer health risk. Therefore, with appropriate limits, CKD can be beneficially reused for land application on agricultural land in a manner that is protective of human health and the environment.

Schreiber, R.J.; Smeenk, S.D. [Schreiber, Yonley and Associates, St. Louis, MO (United States)

1998-12-31T23:59:59.000Z

223

Synthesis of belite cement clinker of high hydraulic reactivity  

SciTech Connect (OSTI)

This study is concerned with the increase of the cooling rate of belite clinker, by using the water quenching for the chemical stabilization of reactive belite, which improves the hydraulic properties of this clinker. The addition of adequate mineralizers, as NaF and Fe{sub 2}O{sub 3}, contributes to the improvement of the clinker properties obtained at low burning temperature. X-ray fluorescence spectroscopy, X-ray diffraction analysis and optical microscopy were used to determine the chemical and mineralogical compositions of this clinker. The samples were analyzed by means of a scanning electronic microscope connected with an energy-dispersive X-ray spectrometer to detect the composition of the belite phase and its morphology. Physical and mechanical properties of this clinker cement were determined. The results show that the belite clinker obtained at 1150 {sup o}C, with lime saturation factor 0.67, is characterized by a great hydraulic reactivity, similar to that of the ordinary alite clinker. The addition of 2% of NaF and the water quenching improved the chemical, mineralogical and structural properties, while improving the cement hydraulic properties.

Kacimi, Larbi [Laboratoire de Genie des Procedes, Departement de Chimie, Universite des Sciences et de la Technologie d'Oran, B.P. 1505, El-M'nouar, U.S.T. Oran (Algeria)], E-mail: kacimi20002000@yahoo.fr; Simon-Masseron, Angelique [Laboratoire des Materiaux a Porosite Controlee, CNRS UMR 7016, Universite de Haute-Alsace, 3, rue Alfred-Werner, F-68093 Mulhouse cedex (France)], E-mail: A.Simon@univ-mulhouse.fr; Salem, Souria [Departement d'Architecture, Faculte de Genie Civile, USTO-Oran (Algeria)], E-mail: zinaisalem@yahoo.fr; Ghomari, Abdelhamid [Departement de Chimie, U.A.I.B., Route de Belahcel, Mostaganem (Algeria)], E-mail: belkey@hotmail.com; Derriche, Zoubir [Laboratoire de Genie des Procedes, Departement de Chimie, Universite des Sciences et de la Technologie d'Oran, B.P. 1505, El-M'nouar, U.S.T. Oran (Algeria)

2009-07-15T23:59:59.000Z

224

Demonstration of Mixed Waste Debris Macroencapsulation Using Sulfur Polymer Cement  

SciTech Connect (OSTI)

This report covers work performed during FY 1997 as part of the Evaluation of Sulfur Polymer Cement Fast-Track System Project. The project is in support of the ``Mercury Working Group/Mercury Treatment Demonstrations - Oak Ridge`` and is described in technical task plan (TTP) OR-16MW-61. Macroencapsulation is the treatment technology required for debris by the U.S. Environmental Protection Agency Land Disposal Restrictions (LDR) under the Resource Conservation and Recovery Act. Based upon the results of previous work performed at Oak Ridge, the concept of using sulfur polymer cement (SPC) for this purpose was submitted to the Mixed Waste Focus Area (MWFA). Because of the promising properties of the material, the MWFA accepted this Quick Win project, which was to demonstrate the feasibility of macroencapsulation of actual mixed waste debris stored on the Oak Ridge Reservation. The waste acceptance criteria from Envirocare, Utah, were chosen as a standard for the determination of the final waste form produced. During this demonstration, it was shown that SPC was a good candidate for macroencapsulation of mixed waste debris, especially when the debris pieces were dry. The matrix was found to be quite easy to use and, once the optimum operating conditions were identified, very straightforward to replicate for batch treatment. The demonstration was able to render LDR compliant more than 400 kg of mixed wastes stored at the Oak Ridge National Laboratory.

Mattus, C.H.

1998-07-01T23:59:59.000Z

225

One Loop Beta Functions in Topologically Massive Gravity  

E-Print Network [OSTI]

We calculate the running of the three coupling constants in cosmological, topologically massive 3d gravity. We find that \

R. Percacci; E. Sezgin

2010-02-15T23:59:59.000Z

226

Unveiling the Formation of Massive Galaxies  

E-Print Network [OSTI]

Massive galaxies, such as nearby ellipticals, have relatively low number densities, yet they host the majority of the stellar mass in the universe. Understanding their origin is a central problem of galaxy formation. Age dating of stellar populations found in modern ellipticals, and observations of star formation in high redshift galaxies, allow us to determine roughly when these systems formed. These age diagnostics however do not tell us what triggered star formation, or how galaxies form as opposed to simply when. Recent analyses of the structures of z > 2 ultraviolet selected galaxies reveal that major galaxy mergers are a likely method for forming some massive galaxies. There are however galaxy populations at high redshift (z > 2), namely infrared and sub-millimeter bright systems, whose evolutionary relationship to modern ellipticals is still uncertain. An improved characterization of these and other high redshift galaxy populations is achievable with large infrared imaging and spectroscopic surveys.

Christopher J. Conselice

2004-04-21T23:59:59.000Z

227

Visser's massive graviton bimetric theory revisited  

SciTech Connect (OSTI)

A massive gravity theory was proposed by Visser in the late 1990s. This theory, based on a background metric b{sub {alpha}{beta}} and on an usual dynamical metric g{sub {alpha}{beta}} has the advantage of being free of ghosts as well as discontinuities present in other massive theories proposed in the past. In the present investigation, the equations of Visser's theory are revisited with particular care on the related conservation laws. It will be shown that a multiplicative factor is missing in the graviton tensor originally derived by Visser, which has no incidence on the weak field approach but becomes important in the strong field regime when, for instance, cosmological applications are considered. In this case, contrary to some previous claims found in the literature, we conclude that a nonstatic background metric is required in order to obtain a solution able to mimic the {Lambda}CDM cosmology.

Roany, Alain de; Chauvineau, Bertrand; Freitas Pacheco, Jose A. de [University of Nice-Sophia Antipolis, Observatoire de la Cote d'Azur, Laboratoire Cassiopee, BP 4229, Nice Cedex 4 (France)

2011-10-15T23:59:59.000Z

228

More on massive 3D gravity  

SciTech Connect (OSTI)

We explore the space of static solutions of the recently discovered three-dimensional 'new massive gravity' (NMG), allowing for either sign of the Einstein-Hilbert term and a cosmological term parametrized by a dimensionless constant {lambda}. For {lambda}=-1 we find black hole solutions asymptotic (but not isometric) to the unique (anti) de Sitter [(A)dS] vacuum, including extremal black holes that interpolate between this vacuum and (A)dS{sub 2}xS{sup 1}. We also investigate unitarity of linearized NMG in (A)dS vacua. We find unitary theories for some dS vacua, but (bulk) unitarity in AdS implies negative central charge of the dual conformal field theories (CFT), except for {lambda}=3 where the central charge vanishes and the bulk gravitons are replaced by 'massive photons'. A similar phenomenon is found in the massless limit of NMG, for which the linearized equations become equivalent to Maxwell's equations.

Bergshoeff, Eric A.; Hohm, Olaf [Centre for Theoretical Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen (Netherlands); Townsend, Paul K. [Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA (United Kingdom)

2009-06-15T23:59:59.000Z

229

Massive Nonplanar Two-Loop Maximal Unitarity  

E-Print Network [OSTI]

We explore maximal unitarity for nonplanar two-loop integrals with up to four massive external legs. In this framework, the amplitude is reduced to a basis of master integrals whose coefficients are extracted from maximal cuts. The hepta-cut of the nonplanar double box defines a nodal algebraic curve associated with a multiply pinched genus-3 Riemann surface. All possible configurations of external masses are covered by two distinct topological pictures in which the curve decomposes into either six or eight Riemann spheres. The procedure relies on consistency equations based on vanishing of integrals of total derivatives and Levi-Civita contractions. Our analysis indicates that these constraints are governed by the global structure of the maximal cut. Lastly, we present an algorithm for computing generalized cuts of massive integrals with higher powers of propagators based on the Bezoutian matrix method.

Mads Sogaard; Yang Zhang

2014-06-19T23:59:59.000Z

230

CREATIC.ca : Solution pour faciliter une appropriation immdiate et pour pallier le paradoxe technico-pdagogique vcu par les futurs enseignants  

E-Print Network [OSTI]

CREATIC.ca : Solution pour faciliter une appropriation immédiate et pour pallier le paradoxe *Université de Moncton, Professeures, FSE de l'Université de Moncton, Moncton, Canada Courriel : isabelc@umoncton.ca /vezinan@umoncton.ca ** Chef de groupe, Apprentissage électronique, ITI, CNRC, 55, chemin Crowley Farm

Paris-Sud XI, Université de

231

Harmonic polylogarithms for massive Bhabha scattering  

E-Print Network [OSTI]

One- and two-dimensional harmonic polylogarithms, HPLs and GPLs, appear in calculations of multi-loop integrals. We discuss them in the context of analytical solutions for two-loop master integrals in the case of massive Bhabha scattering in QED. For the GPLs we discuss analytical representations, conformal transformations, and also their transformations corresponding to relations between master integrals in the s- and t-channel.

M. Czakon; J. Gluza; T. Riemann

2005-08-19T23:59:59.000Z

232

Bigravity and Lorentz-violating massive gravity  

SciTech Connect (OSTI)

Bigravity is a natural arena where a nonlinear theory of massive gravity can be formulated. If the interaction between the metrics f and g is nonderivative, spherically symmetric exact solutions can be found. At large distances from the origin, these are generically Lorentz-breaking bi-flat solutions (provided that the corresponding vacuum energies are adjusted appropriately). The spectrum of linearized perturbations around such backgrounds contains a massless as well as a massive graviton, with two physical polarizations each. There are no propagating vectors or scalars, and the theory is ghost free (as happens with certain massive gravities with explicit breaking of Lorentz invariance). At the linearized level, corrections to general relativity are proportional to the square of the graviton mass, and so there is no van Dam-Veltam-Zakharov discontinuity. Surprisingly, the solution of linear theory for a static spherically symmetric source does not agree with the linearization of any of the known exact solutions. The latter coincide with the standard Schwarzschild-(anti)-de Sitter solutions of general relativity, with no corrections at all. Another interesting class of solutions is obtained where f and g are proportional to each other. The case of bi-de Sitter solutions is analyzed in some detail.

Blas, D.; Garriga, J. [ICC, Departament de Fisica Fonamental, Universitat de Barcelona, Diagonal 647, 08028 Barcelona (Spain); Deffayet, C. [APC, Batiment Condorcet, 10 rue Alice Domont et Leonie Duquet, 75205 Paris Cedex 13 (France); GReCO/IAP, 98 bis Boulevard Arago, 75014 Paris (France)

2007-11-15T23:59:59.000Z

233

Characterization of modified calcium-silicate cements exposed to acidic environment  

SciTech Connect (OSTI)

Portland cement which is used as a binder in concrete in the construction industry has been developed into a biomaterial. It is marketed as mineral trioxide aggregate and is used in dentistry. This material has been reported to be very biocompatible and thus its use has diversified. The extended use of this material has led to developments of newer versions with improved physical properties. The aim of this study was to evaluate the effect of acidic environments found in the oral cavity on fast setting calcium silicate cements with improved physical properties using a combination of techniques. Two fast setting calcium silicate cements (CSA and CFA) and two cement composites (CSAG and CFAG) were assessed by subjecting the materials to lactic acid/sodium lactate buffer gel for a period of 28 days. At weekly intervals the materials were viewed under the tandem scanning confocal microscope (TSM), and scanning electron microscope (SEM). The two prototype cements exhibited changes in their internal chemistry with no changes in surface characteristics. Since the changes observed were mostly sub-surface evaluation of surface characteristics of cement may not be sufficient in the determination of chemical changes occurring. - Research Highlights: {yields} An acidic environment affects modified fast setting calcium silicate-based cements. {yields} No surface changes are observed in acidic environment. {yields} An acidic environment causes sub-surface changes in the material chemistry which are only visible in fractured specimens. {yields} A combination of techniques is necessary in order to evaluate the chemical changes occurring.

Camilleri, Josette, E-mail: josette.camilleri@um.edu.mt

2011-01-15T23:59:59.000Z

234

Improved method and composition for immobilization of waste in cement-based material  

DOE Patents [OSTI]

A composition and method for fixation or immobilization of aqueous hazardous waste material in cement-based materials (grout) is disclosed. The amount of drainable water in the cured grout is reduced by the addition of an ionic aluminum compound to either the waste material or the mixture of waste material and dry-solid cement- based material. This reduction in drainable water in the cured grout obviates the need for large, expensive amounts of gelling clays in grout materials and also results in improved consistency and properties of these cement-based waste disposal materials.

Tallent, O.K.; Dodson, K.E.; McDaniel, E.W.

1987-10-01T23:59:59.000Z

235

Characterization and modeling of the cemented sediment surrounding the Iulia Felix glass  

SciTech Connect (OSTI)

About 1800 years ago a Roman Corbita sunk off the coast of Italy carrying a barrel of glass cullet to the floor of the Adriatic Sea. Samples of glass cullet and the cemented surrounding sediment have been characterized and the reaction between the glass and the sea water saturated with respect to calcite and dolomite has been modeled. Results from characterization and modeling show that the cement phase surrounding the sediment grains is a high-Mg calcite. The origin of the cement phase is likely the reaction between the glass and the sea water to from a Mg-silicate, here modeled as sepiolite.

Strachan, Denis M.; Crum, Jarrod V.; Ryan, Joseph V.; Silvestri, Alberta

2014-02-28T23:59:59.000Z

236

Scnarios pour un Micro Smart Grid Autonomique Sylvain Frey  

E-Print Network [OSTI]

Scénarios pour un Micro Smart Grid Autonomique Sylvain Frey Ada Diaconescu François Huguet gestion de la complexité. Nous pensons que le cas des micro smart grids - réseaux électriques intelligents autonomiques, inédit dans le cadre smart grid, révèle les verrous - mais aussi les perspectives nouvelles

Paris-Sud XI, Université de

237

Actes JFPC 2007 Une approche DPLL pour l'abduction  

E-Print Network [OSTI]

Actes JFPC 2007 Une approche DPLL pour l'abduction Florian Letombe1 Bruno Zanuttini2 1 CRIL, CNRS@cril.univ-artois.fr bruno.zanuttini@info.unicaen.fr R´esum´e L'abduction est le processus consistant `a expliquer une la complexit´e. Dans cet article, nous pr´esentons un algorithme `a la DPLL adapt´e aux probl`emes d'abduction

Paris-Sud XI, Université de

238

Carbon dioxide capture from a cement manufacturing process  

DOE Patents [OSTI]

A process of manufacturing cement clinker is provided in which a clean supply of CO.sub.2 gas may be captured. The process also involves using an open loop conversion of CaO/MgO from a calciner to capture CO.sub.2 from combustion flue gases thereby forming CaCO.sub.3/CaMg(CO.sub.3).sub.2. The CaCO.sub.3/CaMg(CO.sub.3).sub.2 is then returned to the calciner where CO.sub.2 gas is evolved. The evolved CO.sub.2 gas, along with other evolved CO.sub.2 gases from the calciner are removed from the calciner. The reactants (CaO/MgO) are feed to a high temperature calciner for control of the clinker production composition.

Blount, Gerald C. (North Augusta, SC); Falta, Ronald W. (Seneca, SC); Siddall, Alvin A. (Aiken, SC)

2011-07-12T23:59:59.000Z

239

Cement substitution by a combination of metakaolin and limestone  

SciTech Connect (OSTI)

This study investigates the coupled substitution of metakaolin and limestone in Portland cement (PC). The mechanical properties were studied in mortars and the microstructural development in pastes by X-ray diffraction, thermogravimetry analysis, mercury intrusion porosimetry and isothermal calorimetry. We show that 45% of substitution by 30% of metakaolin and 15% of limestone gives better mechanical properties at 7 and 28 days than the 100% PC reference. Our results show that calcium carbonate reacts with alumina from the metakaolin, forming supplementary AFm phases and stabilizing ettringite. Using simple mass balance calculations derived from thermogravimetry results, we also present the thermodynamic simulation for the system, which agrees fairly well with the experimental observations. It is shown that gypsum addition should be carefully balanced when using calcined clays because it considerably influences the early age strength by controlling the very rapid reaction of aluminates.

Antoni, M., E-mail: mathieu.antoni@epfl.ch [EPFL-STI-IMX-Laboratoires des Materiaux de Construction, Station12, CH-1015 Lausanne (Switzerland); Rossen, J. [EPFL-STI-IMX-Laboratoires des Materiaux de Construction, Station12, CH-1015 Lausanne (Switzerland)] [EPFL-STI-IMX-Laboratoires des Materiaux de Construction, Station12, CH-1015 Lausanne (Switzerland); Martirena, F. [CIDEM-UCLV, Universidad Las Villas, Santa Clara (Cuba)] [CIDEM-UCLV, Universidad Las Villas, Santa Clara (Cuba); Scrivener, K. [EPFL-STI-IMX-Laboratoires des Materiaux de Construction, Station12, CH-1015 Lausanne (Switzerland)] [EPFL-STI-IMX-Laboratoires des Materiaux de Construction, Station12, CH-1015 Lausanne (Switzerland)

2012-12-15T23:59:59.000Z

240

In What Form is Lime Present in Portland Cement  

E-Print Network [OSTI]

to obtain Si02.33a0, In his conclusions Hebuffat does not consider it of importance whether alit consists of pure Si02.3CaO or a crystalline compound of Si02.2CaO with 3a0 and an aluminate. He says the aluminate in Portland dement can­ not be Al 203.30a..., Erd- meyer, Nev/berry's, Zulkowski, Rebuff at, Meyers, Richardson, Michaelis and Meade• d. Work of the Carbegie Institute of Washington on CaO #Si0 2 series and binary compounds of Al 2°3> Si0 2, MgO, CaO. On the presence of free lime in cement...

Wright, Claude W.

1910-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Construction d'une ontologie pour la prise en charge de l'hypertension artrielle  

E-Print Network [OSTI]

Construction d'une ontologie pour la prise en charge de l'hypertension artérielle Olivier Steichen1 : Une ontologie pour la prise en charge de l'hypertension est construite pour assister l'analyse qualitative des décisions médicales dans un service spé- cialisé en hypertension artérielle. La modélisation s

Paris-Sud XI, Université de

242

E-Print Network 3.0 - approche pour comprendre Sample Search...  

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

les... Approche processus Systme documentaire Amlioration de la qualit Norme ISO 9001 et certification : Les... complmentaires : - pour les doctorants de l'cole...

243

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT DE GRENOBLE  

E-Print Network [OSTI]

professeurs et ami(e)s français, dans ma langue maternelle (Le Persan), je trouverais les mots jutes pour leur

Paris-Sud XI, Université de

244

Experimental study of potential wellbore cement carbonation by various phases of carbon dioxide during geologic carbon sequestration  

SciTech Connect (OSTI)

Hydrated Portland cement was reacted with carbon dioxide (CO2) in supercritical, gaseous, and aqueous phases to understand the potential cement alteration processes along the length of a wellbore, extending from deep CO2 storage reservoir to the shallow subsurface during geologic carbon sequestration. The 3-D X-ray microtomography (XMT) images displayed that the cement alteration was significantly more extensive by CO2-saturated synthetic groundwater than dry or wet supercritical CO2 at high P (10 MPa)-T (50°C) conditions. Scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) analysis also exhibited a systematic Ca depletion and C enrichment in cement matrix exposed to CO2-saturated groundwater. Integrated XMT, XRD, and SEM-EDS analyses identified the formation of extensive carbonated zone filled with CaCO3(s), as well as the porous degradation front and the outermost silica-rich zone in cement after exposure to CO2-saturated groundwater. The cement alteration by CO2-saturated groundwater for 2-8 months overall decreased the porosity from 31% to 22% and the permeability by an order of magnitude. Cement alteration by dry or wet supercritical CO2 was slow and minor compared to CO2-saturated groundwater. A thin single carbonation zone was formed in cement after exposure to wet supercritical CO2 for 8 months or dry supercritical CO2 for 15 months. Extensive calcite coating was formed on the outside surface of a cement sample after exposure to wet gaseous CO2 for 1-3 months. The chemical-physical characterization of hydrated Portland cement after exposure to various phases of carbon dioxide indicates that the extent of cement carbonation can be significantly heterogeneous depending on CO2 phase present in the wellbore environment. Both experimental and geochemical modeling results suggest that wellbore cement exposure to supercritical, gaseous, and aqueous phases of CO2 during geologic carbon sequestration is unlikely to damage the wellbore integrity because cement alteration by all phases of CO2 is dominated by carbonation reaction. This is consistent with previous field studies of wellbore cement with extensive carbonation after exposure to CO2 for 3 decades. However, XMT imaging indicates that preferential cement alteration by supercritical CO2 or CO2-saturated groundwater can occur along the cement-steel or cement-rock interfaces. This highlights the importance of further investigation of cement degradation along the interfaces of wellbore materials to ensure permanent geologic carbon storage.

Jung, Hun Bok; Um, Wooyong

2013-08-16T23:59:59.000Z

245

E-modulus evolution and its relation to solids formation of pastes from commercial cements  

SciTech Connect (OSTI)

Models for early age E-modulus evolution of cement pastes are available in the literature, but their validation is limited. This paper provides correlated measurements of early age evolution of E-modulus and hydration of pastes from five commercial cements differing in limestone content. A recently developed methodology allowed continuous monitoring of E-modulus from the time of casting. The methodology is a variant of classic resonant frequency methods, which are based on determination of the first resonant frequency of a composite beam containing the material. The hydration kinetics - and thus the rate of formation of solids - was determined using chemical shrinkage measurements. For the cements studied similar relationships between E-modulus and chemical shrinkage were observed for comparable water-to-binder ratio. For commercial cements it is suggested to model the E-modulus evolution based on the amount of binder reacted, instead of the degree of hydration.

Maia, Lino, E-mail: lino.maia@fe.up.pt [LABEST - Laboratory for the Concrete Technology and Structural Behaviour, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto (Portugal); Centro de Ciencias Exatas e da Engenharia, Universidade da Madeira, Campus Universitario da Penteada, 9020-105 Funchal (Portugal); Azenha, Miguel, E-mail: miguel.azenha@civil.uminho.pt [ISISE - Institute for Sustainability and Innovation in Structural Engineering, Universidade do Minho, Escola de Engenharia, Campus de Azurem, 4800-058 Guimaraes (Portugal); Geiker, Mette, E-mail: mge@byg.dtu.dk [DTU - Department of Civil Engineering, Technical University of Denmark, Brovej, Building 118, DK-2800 Kgs. Lyngby (Denmark); NTNU - Department of Structural Engineering, Norwegian University of Science and Technology, Rich. Birkelandsvei 1A, 7491 Trondheim (Norway); Figueiras, Joaquim, E-mail: jafig@fe.up.pt [LABEST - Laboratory for the Concrete Technology and Structural Behaviour, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto (Portugal)

2012-07-15T23:59:59.000Z

246

Microsoft Word - NETL-TRS-003-2012_Cementing Research Needs_20121207...  

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

of Research Needs Related to Improving Primary Cement Isolation of Formations in Deep Offshore Wells 7 December 2012 Office of Fossil Energy NETL-TRS-3-2012 Disclaimer This report...

247

Effect of spatial variability on the bearing capacity of cement-treated ground  

E-Print Network [OSTI]

This paper presents a reliability assessment for the undrained bearing capacity of a surface strip foundation based on the results of a probabilistic study in which the shear strength and unit weight of cement-treated ...

Kasama, Kiyonobu

248

Emerging Energy-efficiency and CO2 Emission-reduction Technologies for Cement and Concrete Production  

E-Print Network [OSTI]

2 abatement using the calcium looping cycle. Energy Environ.the CO 2 captured by the calcium looping system, use of the16. Flow diagram of calcium-looping CO 2 capture and cement

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

249

Sources of high temperature degradation of cement-based materials : nanoindentation and microporoelastic analysis  

E-Print Network [OSTI]

The effects of high temperature exposure on cement-based materials have been under investigation for quite some time, but a fundamental understanding of the sources of high temperature degradation has been limited by ...

DeJong, Matthew J. (Matthew Justin)

2005-01-01T23:59:59.000Z

250

Synthesis and Characterization of High Temperature Cement-Based Hydroceramic Materials   

E-Print Network [OSTI]

Cement-based materials are of importance in the construction of geothermal wells and high-temperature oil and gas wells. These materials fill the annulus between the well casing and the rock forming a protective layer, ...

Kyritsis, Konstantinos

2009-01-01T23:59:59.000Z

251

Effects of microorganisms growth on the long-term stability of cement and bitumen  

SciTech Connect (OSTI)

Cement is used as a coating matrix for nuclear waste or as an engineered barrier of waste repositories situated in geological formations. The effect of mineral acids excreted by bacteria (Thiobacillus) or organic acids produced by fungi, on the biodegradation of cement is discussed. Organic acids are quantitatively and qualitatively determined during growth of fungi over a two-year period. Even with high pH conditions, pH of the cement {approx} 11, growth of microorganisms occurs. Biodeterioration of cement is expressed in terms of bioleaching velocity of calcium and is observed by electron microscopy. Bitumen is commonly used as a matrix for the long-term storage of radioactive wastes. Long-term biodegrability of bitumen is discussed as a function of its chemical composition and various studied microorganisms.

Libert, M.F.; Sellier, R.; Jouquet, G.; Trescinski, M.; Spor, H. [Nuclear Research Center of Cadarache, St.Paul-Lez-Durance (France)

1993-12-31T23:59:59.000Z

252

Lattice Boltzmann simulations of the permeability and capillary adsorption of cement model microstructures  

SciTech Connect (OSTI)

The lattice Boltzmann method is used to investigate the permeability of microstructures of cement pastes generated using the numerical models CEMHYD3D (Bentz, 1997) and {mu}IC (Bishnoi and Scrivener, 2009). Results are reported as a function of paste water-to-cement ratio and degree of hydration. The permeability decreases with increasing hydration and decreasing water-to-cement ratio in agreement with experiment. However the permeability is larger than the experimental data recorded using beam bending methods (Vichit-Vadakan and Scherer, 2002). Notwithstanding, the lattice Boltzmann results compare favourably with alternate numerical methods of permeability calculation for cement model microstructures. In addition, we show early results for the liquid/vapour capillary adsorption and desorption isotherms in the same model {mu}IC structures. The broad features of the experimental capillary porosity isotherm are reproduced, although further work is required to adequately parameterise the model.

Zalzale, M. [Laboratory of Construction Materials, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland)] [Laboratory of Construction Materials, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne (Switzerland); McDonald, P.J., E-mail: p.mcdonald@surrey.ac.uk [Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom)

2012-12-15T23:59:59.000Z

253

E-Print Network 3.0 - antibiotic-loaded cement spacers Sample...  

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

in this study. Sealed Reference Sample Sample Cement Paste 10 mm 10 mm 11.5mm 8mm Plastic Spacers 5 mm... based on Stokes equation actually suggests that some of the...

254

E-Print Network 3.0 - ash cements stabilized Sample Search Results  

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

Science 6 By-Products Utilization Summary: OF WISCONSIN - MILWAUKEE 12;2 Use of Clean Coal Ash as Setting Time Regulator in Portland Cement by Zichao Wu... as setting time...

255

Portland cement mortar modified with latex and fiber glass for thin shell construction  

E-Print Network [OSTI]

and materials required for the elaborate formwork. Building codes are also in need of revision to include provisions for thin shell construction. The objective of this study was to investigate the possible potential use of portland cement mortar modified...

Raymond, Jewell Duane

1963-01-01T23:59:59.000Z

256

Assessment of durability performance of "Early-Opening-to-Traffic" Portland Cement Concrete pavement and patches  

E-Print Network [OSTI]

This study relates the assessment of durability to ''early-opening-to-traffic'' (EOT) portland cement concrete (PCC). Several factors were identified relative to the performance of EOT PCC. Each of these factors was considered in terms of freeze...

Shrestha, Pradhumna Babu

1999-01-01T23:59:59.000Z

257

Detecting and modeling cement failure in high pressure/ high temperature wells using finite-element method  

E-Print Network [OSTI]

conditions and are investigated simultaneously to more accurately predict cement failure. The results of this study show the relevant dependency of stress principles with temperature and pressure. These results clarify the deformation caused by any...

Shahri, Mehdi Abbaszadeh

2006-04-12T23:59:59.000Z

258

Emerging Energy-efficiency and CO2 Emission-reduction Technologies for Cement and Concrete Production  

E-Print Network [OSTI]

Hilger, J. 2003. Combined Utilization of Oil Shale Energyand Oil Shale Minerals within the Production of Cement andOther Hydraulic Minerals. Oil Shale, Vol. 20, No. 3, pp.

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

259

Grinding of cement clinkers : linking multi-scale fracture properties to system chemistry, mineralogy and microstructure  

E-Print Network [OSTI]

Growing environmental concerns encourage the cement industry to improve its environmental performance, which in turn renews the interest in clinker grinding efficiency. Current knowledge on clinker grinding was built over ...

Wilson, William, S.M. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

260

Non-Linear Drying Diffusion and Viscoelastic Drying Shrinkage Modeling in Hardened Cement Pastes  

E-Print Network [OSTI]

modeling with an average diffusion coefficient and with determined viscoelastic parameters from creep tests agreed well compared to the shrinkage data from experiments, indicating that drying shrinkage of cement paste may be considered as a poroviscoelastic...

Leung, Chin K.

2010-07-14T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Microsoft Word - NETL-TRS-2-2014_Addendum 1 to Foamed Cement...  

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

Addendum 1 to Computed Tomography and Statistical Analysis of Bubble Size Distributions in Atmospheric-Generated Foamed Cement 6 March 2014 Office of Fossil Energy NETL-TRS-2-2014...

262

Analysis of Energy-Efficiency Opportunities for the Cement Industry in Shandong Province, China  

E-Print Network [OSTI]

Potential (GWh) CO2 Emission Reduction Potential (kt CO 2 )Fuel Savings (TJ) CO2 Emission Reduction Potential (kt COPotentials and CO2 Emission Reductions in 16 Studied Cement

Price, Lynn

2010-01-01T23:59:59.000Z

263

Potential Energy Savings and CO2 Emissions Reduction of China's Cement Industry  

E-Print Network [OSTI]

Energy Savings and CO2 Emissions Reduction of China’s CementEnergy Savings and CO2 Emissions Reduction of China’s Cementenergy savings and CO2 emission reduction potentials are

Ke, Jing

2013-01-01T23:59:59.000Z

264

Effects of composition and exposure on the solar reflectance of Portland cement concrete  

SciTech Connect (OSTI)

Increasing the solar reflectance (albedo) of a paved surface keeps it cooler in the sun, reducing convection of heat from pavement to air and thereby decreasing the ambient air temperature. Simulations of the influence of pavement albedo on air temperature in Los Angeles predict that increasing the albedo of 1,250 km2 of pavement by 0.25 would save cooling energy worth $15M yr-1, and reduce smog-related medical and lost-work expenses by $76M yr-1. Most sidewalks and a small fraction of roads and parking areas are paved with portland cement concrete, which can be made quite reflective through suitable choice of cement and aggregate. Variations with composition and environmental exposure of the albedos of portland cement concrete pavements were investigated through laboratory fabrication and exposure of 32 mixes of concrete. Twenty-four mixes yielded substandard, ''rough'' concretes due to high, unmet aggregate water demand. The albedos of the remaining eight ''smooth'' concrete mixes ranged from 0.41 to 0.77 (mean 0.59). Simulated weathering, soiling, and abrasion each reduced average concrete albedo (mean decreases 0.06, 0.05, and 0.19, respectively), though some samples became slightly more reflective through weathering or soiling. Simulated rain (wetting) strongly depressed the albedos of concretes (mean decrease 0.23) until their surfaces were dried. Concrete albedo grew as the cement hydration reaction progressed (mean increase 0.08), but stabilized within six weeks of casting. White-cement concretes were on average significantly more reflective than gray-cement concretes. The albedo of the most-reflective white-cement concrete was 0.18 to 0.39 higher than that of the most-reflective gray-cement concrete, depending on state of exposure. Concrete albedo generally correlated with cement albedo and sand albedo, and, after abrasion, with rock albedo. Cement albedo had a disproportionately strong influence on the reflectance of concrete. Efflorescence and surface carbonation whitened some gray-cement mixes.

Levinson, Ronnen; Akbari, Hashem

2001-12-21T23:59:59.000Z

265

Holographic renormalization of new massive gravity  

SciTech Connect (OSTI)

We study holographic renormalization for three-dimensional new massive gravity. By studying the general falloff conditions for the metric allowed by the model at infinity, we show that at the critical point where the central charges of the dual conformal field theory (CFT) are zero, it contains a leading logarithmic behavior. In the context of AdS/CFT correspondence it can be identified as a source for an irrelevant operator in the dual CFT. The presence of the logarithmic falloff may be interpreted as the fact that the dual CFT would be a logarithmic conformal field theory.

Alishahiha, Mohsen [School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Naseh, Ali [School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran (Iran, Islamic Republic of)

2010-11-15T23:59:59.000Z

266

Holographic superconductors from the massive gravity  

E-Print Network [OSTI]

A holographic superconductor is constructed in the background of a massive gravity theory. In the normal state without condensation, the conductivity exhibits a Drude peak that approaches a delta function in the massless gravity limit as studied by David Vegh. In the superconducting state, besides the infinite DC conductivity, the AC conductivity has Drude behavior at low frequency followed by a power law-fall. These results are in agreement with that found earlier by Horowitz and Santos, who studied a holographic superconductor with an implicit periodic potential beyond the probe limit. The results also agree with measurements on some cuprates.

Hua Bi Zeng; Jian-Pin Wu

2014-09-24T23:59:59.000Z

267

Casimir Effect of Scalar Massive Field  

E-Print Network [OSTI]

The energy momentum tensor is used to introduce the Casimir force of the massive scalar field acting on a nonpenetrating surface. This expression can be used to evaluate the vacuum force by employing the appropriate field operators. To simplify our formalism we also relates the vacuum force expression to the imaginary part of the Green function via the fluctuation dissipation theorem and Kubo formula. This allows one to evaluate the vacuum force without resorting to the process of field quantization. These two approaches are used to calculate the attractive force between two nonpenetrating plates. Special attention is paid to the generalization of the formalism to D + 1 space-time dimensions.

Sonia Mobassem

2014-06-03T23:59:59.000Z

268

Transport coefficients of a massive pion gas  

E-Print Network [OSTI]

We review or main results concerning the transport coefficients of a light meson gas, in particular we focus on the case of a massive pion gas. Leading order results according to the chiral power-counting are presented for the DC electrical conductivity, thermal conductivity, shear viscosity, and bulk viscosity. We also comment on the possible correlation between the bulk viscosity and the trace anomaly in QCD, as well as the relation between unitarity and a minimum of the quotient $\\eta/s$ near the phase transition.

D. Fernandez-Fraile; A. Gomez Nicola

2009-12-20T23:59:59.000Z

269

A Massive Stellar Burst Before the Supernova  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation Desert SouthwestTechnologies |November 2011A First Look at YeastMES- HelpingMUONA Massive

270

Submicron carbon filament cement-matrix composites for electromagnetic interference shielding  

SciTech Connect (OSTI)

Carbon filaments of diameter 0.1 mm were found to be a much more effective additive than conventional carbon fibers of diameter 10 mm in providing cement pastes capable of electromagnetic interference shielding. With 0.54 vol. % filaments and a shield thickness of 4 mm, a shielding effectiveness of 30 dB was attained at 1--2 GHz. However, the filaments were less effective than the fibers for reinforcing and for providing strain sensing cement-matrix composites.

Fu, X.; Chung, D.D.L. [State Univ. of New York, Buffalo, NY (United States). Composite Materials Research Lab.] [State Univ. of New York, Buffalo, NY (United States). Composite Materials Research Lab.

1996-10-01T23:59:59.000Z

271

The physical and chemical aspects of the leaching behavior of metals from portland cement  

E-Print Network [OSTI]

THE PHYSICAL AND CHEMICAL ASPECTS OF THE LEACHING BEHAVIOR OF METALS FROM PORTLAND CEMENT A Thesis by RICARDO CORYE DAVIS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1990 Major Subject: Chemistry THE PHYSICAL AND CHEMICAL ASPECTS OF THE LEACHING BEHAVIOR OF METALS FROM PORTLAND CEMENT A Thesis by RICARDO CORYE DAVIS Approved as to style and content by: David L. Cocke (Co...

Davis, Ricardo Corye

1990-01-01T23:59:59.000Z

272

Determining the effective diffusivity of ions in hazardous wastes solidified by portland cement  

E-Print Network [OSTI]

DETERMINING THE EFFECTIVE DIFFUSIVITY OF TONS IN HAZARDOUS WASTES SOLIDIFIED BY PORTLAND CEMENT A Thesis by GLEN GREGORY TAFFINDER Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE May 1991 Major Subject: Civil Engineering DETERMINING THE EFFECTIVE DIFFUSIVITY OF TONS IN HAZARDOUS WASTES SOLIDIFIED BY PORTLAND CEMENT A Thesis by GLEN GREGORY TAFFINDER Approved as to scyle and content by: Bill...

Taffinder, Glen Gregory

1991-01-01T23:59:59.000Z

273

Preliminary non-destructive assessment of moisture content, hydration and dielectric properties of Portland cement concrete  

E-Print Network [OSTI]

PRELIMINARY NON-DESTRUCTIVE ASSESSMENT OF MOISTURE CONTENT, HYDRATION AND DIELECTRIC PROPERTIES OF PORTLAND CEMENT CONCRETE A Thesis by IVAN AVELAR LEZAMA Submitted to the Office of Graduate Studies of Texas A... AND DIELECTRIC PROPERTIES OF PORTLAND CEMENT CONCRETE A Thesis by IVAN AVELAR LEZAMA Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE...

Avelar Lezama, Ivan

2007-04-25T23:59:59.000Z

274

The use of Devonian oil shales in the production of portland cement  

SciTech Connect (OSTI)

The Lafarge Corporation operates a cement plant at Alpena, Michigan in which Antrim shale, a Devonian oil shale, is used as part of the raw material mix. Using this precedent the authors examine the conditions and extent to which spent shale might be utilized in cement production. They conclude that the potential is limited in size and location but could provide substantial benefit to an oil shale operation meeting these criteria.

Schultz, C.W.; Lamont, W.E. [Alabama Univ., University, AL (United States); Daniel, J. [Lafarge Corp., Alpena, MI (United States)

1991-12-31T23:59:59.000Z

275

Percutaneous Extraction of Cement Leakage After Vertebroplasty Under CT and Fluoroscopy Guidance: A New Technique  

SciTech Connect (OSTI)

Purpose: We report a new minimally invasive technique of extraction of cement leakage following percutaneous vertebroplasty in adults. Methods: Seven adult patients (five women, two men; mean age: 81 years) treated for vertebral compression fractures by percutaneous vertebroplasty had cement leakage into perivertebral soft tissues along the needle route. Immediately after vertebroplasty, the procedure of extraction was performed under computed tomography (CT) and fluoroscopy guidance: a Chiba needle was first inserted using the same route as the vertebroplasty until contact was obtained with the cement fragment. This needle was then used as a guide for an 11-gauge Trocar t'am (Thiebaud, France). After needle withdrawal, a 13-gauge endoscopy clamp was inserted through the cannula to extract the cement fragments. The whole procedure was performed under local anesthesia. Results: In each patient, all cement fragments were withdrawn within 10 min, without complication. Conclusions: This report suggests that this CT- and fluoroscopy-guided percutaneous technique of extraction could reduce the rate of cement leakage-related complications.

Amoretti, Nicolas, E-mail: amorettinicolas@yahoo.fr; Huwart, Laurent, E-mail: huwart.laurent@wanadoo.fr [Centre Hospitalo-Universitaire de Nice, Department of Radiology (France)

2012-12-15T23:59:59.000Z

276

METHYL CYANIDE OBSERVATIONS TOWARD MASSIVE PROTOSTARS  

SciTech Connect (OSTI)

We report the results of a survey in the CH{sub 3}CN J = 12 {yields} 11 transition toward a sample of massive proto-stellar candidates. The observations were carried out with the 10 m Submillimeter Telescope on Mount Graham, AZ. We detected this molecular line in 9 out of 21 observed sources. In six cases this is the first detection of this transition. We also obtained full beam sampled cross-scans for five sources which show that the lower K-components can be extended on the arcminute angular scale. The higher K-components, however, are always found to be compact with respect to our 36'' beam. A Boltzmann population diagram analysis of the central spectra indicates CH{sub 3}CN column densities of about 10{sup 14} cm{sup -2}, and rotational temperatures above 50 K, which confirms these sources as hot molecular cores. Independent fits to line velocity and width for the individual K-components resulted in the detection of an increasing blueshift with increasing line excitation for four sources. Comparison with mid-infrared (mid-IR) images from the SPITZER GLIMPSE/IRAC archive for six sources show that the CH{sub 3}CN emission is generally coincident with a bright mid-IR source. Our data clearly show that the CH{sub 3}CN J = 12 {yields} 11 transition is a good probe of the hot molecular gas near massive protostars, and provide the basis for future interferometric studies.

Rosero, V.; Hofner, P. [Physics Department, New Mexico Tech, 801 Leroy Place, Socorro, NM 87801 (United States); Kurtz, S. [Centro de Radioastronomia y Astrofisica, Universidad Nacional Autonoma de Mexico, Morelia 58090 (Mexico); Bieging, J. [Department of Astronomy and Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); Araya, E. D. [Physics Department, Western Illinois University, 1 University Circle, Macomb, IL 61455 (United States)

2013-07-01T23:59:59.000Z

277

Massively Parallel Indirect Dielectrophoresis Controlled Placement of Carbon Nanotubes.  

E-Print Network [OSTI]

??Placement of single walled carbon nanotubes is demonstrated through massively parallel indirect dielectrophoresis (MPID). MPID is shown to be able to control the placement of… (more)

Conley, Hiram Jacob

2009-01-01T23:59:59.000Z

278

Feedback Processes [in Massive Star Formation]: A Theoretical Perspective  

E-Print Network [OSTI]

I review the evidence for the importance of feedback from massive stars at small and large scales. The feedback mechanisms include accretion luminosity, ionizing radiation, collimated outflows, and stellar winds. The good news is that feedback doesn't entirely prevent the formation of massive stars, while the bad news is that we don't know what does limit their masses. Feedback from massive stars also influences their surroundings. I argue that this does not produce a triggering efficiency above unity, nor does it prevent lots of prompt star formation in GMCs, though it may preserve massive remnants of the clouds for many dynamical times.

Mordecai-Mark Mac Low

2007-11-26T23:59:59.000Z

279

Th`eor`eme de Paley-Wiener pour les fonctions de Whittaker sur un groupe reductif p-adique  

E-Print Network [OSTI]

Th`eor`eme de Paley-Wiener pour les fonctions de Whittaker sur un groupe r´eductif p-adique Patrick transform´ee de Fourier pour cet espace et d'en caract´eriser l'image. Ce Th´eor`eme est l'analogue pour les fonctions de Whittaker du Th´eor`eme de Paley-Wiener pour les fonctions sur le groupe, du `a Joseph

Paris-Sud XI, Université de

280

Systmes multi-agents pour la gestion de sources d'nergie renouvelable et de stockage de masse  

E-Print Network [OSTI]

centres de stockage et une in- terconnexion HVDC (réseau à courant continu à haute tension). Pour piloter

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "massive cement pour" 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

Energy efficiency and carbon dioxide emissions reduction opportunities in the U.S. cement industry  

SciTech Connect (OSTI)

This paper reports on an in-depth analysis of the U.S. cement industry, identifying cost-effective energy efficiency measures and potentials. The authors assess this industry at the aggregate level (Standard Industrial Classification 324), which includes establishments engaged in manufacturing hydraulic cements, including Portland, natural, masonry, and pozzolana when reviewing industry trends and when making international comparisons. Coal and coke are currently the primary fuels for the sector, supplanting the dominance of natural gas in the 1970s. Between 1970 and 1997, primary physical energy intensity for cement production (SIC 324) dropped 30%,from 7.9 GJ/t to 5.6 GJ/t, while carbon dioxide intensity due to fuel consumption (carbon dioxide emissions expressed in tons of carbon per ton cement) dropped 25%, from 0.16 tC/ton to 0.12 tC/ton. Carbon dioxide intensity due to fuel consumption and clinker calcination dropped 17%, from 0.29 tC/ton to 0.24 tC/ton. They examined 30 energy efficient technologies and measures and estimated energy savings, carbon dioxide savings, investment costs, and operation and maintenance costs for each of the measures. They constructed an energy conservation supply curve for U.S. cement industry which found a total cost-effective reduction of 0.6 GJ/ton of cement consisting of measures having a simple payback period of 3 years or less. This is equivalent to potential energy savings of 11% of 1994 energy use for cement making and a savings of 5% of total 1994 carbon dioxide emissions by the U.S. cement industry. Assuming the increased production of blended cement in the U.S., as is common in many parts of the world, the technical potential for energy efficiency improvement would not change considerably. However, the cost-effective potential, would increase to 1.1 GJ/ton cement or 18% of total energy use, and carbon dioxide emissions would be reduced by 16%.

Martin, Nathan; Worrell, Ernst; Price, Lynn

1999-08-01T23:59:59.000Z

282

Le magn)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard  

E-Print Network [OSTI]

Le magné)sme ar)ficiel pour les gaz d'atomes froids Jean Dalibard Année 2013-14 Chaire Atomes et rayonnement Magné8sme ar8ficiel pour un atome isolé poten8el vecteur et la simula8on du magné8sme orbital A(r) V

Dalibard, Jean

283

ISDA 2010, Montpellier 28-30 Juin 2010 1 CONTRIBUTIONS DES PARTENARIATS POUR  

E-Print Network [OSTI]

CONNAISSANCES AGRONOMIQUES SUR LA GESTION DE L'HERBE ET DEVELOPPER DES OUTILS ACTIONNABLES PAR DES CONSEILLERS'équipe Orphée (Outils modèles et Références Pour la gestion des systèmes HErbagErs) à produire des connaissancesISDA 2010, Montpellier 28-30 Juin 2010 1 CONTRIBUTIONS DES PARTENARIATS POUR CONCEVOIR DES

Boyer, Edmond

284

CAHIER DU CAMPUS LOGISTIQUE N2 Des carrefours intelligents pour une meilleure gestion du  

E-Print Network [OSTI]

CAHIER DU CAMPUS LOGISTIQUE N°2 Des carrefours « intelligents » pour une meilleure gestion du gestion du trafic en milieu urbain nécessite le déploiement de solutions techniques innovantes pour Journal Européen des Systèmes Automatisés. MOTS-CLÉS : gestion du trafic, réseau de Petri hybride, système

Boyer, Edmond

285

Architecture de contrle pour la gestion Contextuelle de tches sur les AUV  

E-Print Network [OSTI]

Architecture de contrôle pour la gestion Contextuelle de tâches sur les AUV A. El Jalaoui, D niveaux, un superviseur global, des superviseurs locaux et enfin un ensemble de modules de gestion des AUV. L'étude se basera sur le cas de l'AUV Taipan. De taille réduite et conçu pour opérer dans des

Boyer, Edmond

286

Les POMDP: une solution pour modliser des problmes de gestion adaptative  

E-Print Network [OSTI]

Les POMDP: une solution pour modéliser des problèmes de gestion adaptative en biologie de la conservation, la gestion adaptative est un processus itératif d'amélioration de la gestion par la réduction de l'incertitude à travers une surveillance. La gestion adaptative est l'outil principal pour la

Boyer, Edmond

287

Un modle et une algbre pour les systmes de gestion d'ontologies  

E-Print Network [OSTI]

Un modèle et une algèbre pour les systèmes de gestion d'ontologies Gilles Falquet Claire, guyot@cui.unige.ch Résumé. Nous présentons ici une approche pour la gestion de bases d'ontolo- gies systèmes de gestion qui permettent non seulement de les stocker mais également de les aligner et de les

Genève, Université de

288

Programme de bourses en codirection pour doctorants Les Universits du Kazakhstan cherchent des codirecteurs  

E-Print Network [OSTI]

Programme de bourses en codirection pour doctorants Kazakhstan Les Universités du Kazakhstan quarantaine d'établissements d'enseignement supérieur du Kazakhstan. Ce programme s'inscrit dans une politique outil intéressant pour s'engager dans de nouvelles coopérations. L'Ambassade de France au Kazakhstan

Jeanjean, Louis

289

TALN 2010, Montral, 1923 juillet 2010 Rcriture de graphes de dpendances pour l'interface  

E-Print Network [OSTI]

nous proposons d'u- tiliser pour étudier les liens entre différentes représentations linguistiques syntaxiques pour le calcul de la sémantique et explicite le lien entre syntaxe et sémantique sous syntax and underspecified semantics. The second one breaks up the search for models of underspecified

Paris-Sud XI, Université de

290

TALN 2010, Montral, 1923 juillet 2010 Rcriture de graphes de dpendances pour l'interface  

E-Print Network [OSTI]

nous proposons d'uti- liser pour étudier les liens entre différentes représentations linguistiques syntaxiques pour le calcul de la sémantique et explicite le lien entre syntaxe et sémantique sous syntax and underspecified semantics. The second one breaks up the search for models of underspecified

Perrier, Guy

291

La bote moustaches de TUKEY un outil pour initier la Statistique  

E-Print Network [OSTI]

La boîte à moustaches de TUKEY un outil pour initier à la Statistique Monique Le Guen CNRS- MATISSE1 Résumé La boîte à moustaches une traduction de Box & Whiskers Plot, est une invention de TUKEY moustaches une traduction de Box & Whiskers Plot, est une invention de TUKEY (1977) pour représenter

Paris-Sud XI, Université de

292

LeTemps.ch I Des robots pour mieux comprendre l,volution 08011217:49  

E-Print Network [OSTI]

LeTemps.ch I Des robots pour mieux comprendre l,volution LE TEMPs 08011217:49 biologie Vendredi6 janvier 2012 Des robots pour mieux comprendre l'6volution Par L'aldatoire entrerait en jeu Le d6'y parvenir en employant comme cobayes... des robots. Etude qu,ils publient cette semaine dans une

Alvarez, Nadir

293

La nouvelle norme ISO/IEC 29110 pour les trs petits organismes  

E-Print Network [OSTI]

La nouvelle norme ISO/IEC 29110 pour les très petits organismes Claude Y. Laporte, ing., M école d'ingénieurs canadienne lauréate du Trophée ISO 2011 pour l'enseignement supérieur en normalisation · L'École de technologie supérieure est la lauréate du Trophée ISO pourlauréate du Trophée ISO

Laporte, Claude Y.

294

Propagation de Contraintes et Listes Tabou pour le CSP Mohammad DIB, Alexandre CAMINADA, Hakim MABED  

E-Print Network [OSTI]

Propagation de Contraintes et Listes Tabou pour le CSP Mohammad DIB, Alexandre CAMINADA, Hakim pour le CSP. Nous proposons une méthode déterministe qui permet de gérer dynamiquement des coupes dans percentages. 1 INTRODUCTION Un problème de satisfaction de contraintes (CSP) [1] est défini par un ensemble de

Paris-Sud XI, Université de

295

DETECTING MASSIVE GRAVITONS USING PULSAR TIMING ARRAYS  

SciTech Connect (OSTI)

At the limit of weak static fields, general relativity becomes Newtonian gravity with a potential field that falls off as inverse distance rather than a theory of Yukawa-type fields with a finite range. General relativity also predicts that the speed of disturbances of its waves is c, the vacuum light speed, and is non-dispersive. For these reasons, the graviton, the boson for general relativity, can be considered to be massless. Massive gravitons, however, are features of some alternatives to general relativity. This has motivated experiments and observations that, so far, have been consistent with the zero-mass graviton of general relativity, but further tests will be valuable. A basis for new tests may be the high sensitivity gravitational wave (GW) experiments that are now being performed and the higher sensitivity experiments that are being planned. In these experiments, it should be feasible to detect low levels of dispersion due to non-zero graviton mass. One of the most promising techniques for such a detection may be the pulsar timing program that is sensitive to nano-Hertz GWs. Here, we present some details of such a detection scheme. The pulsar timing response to a GW background with the massive graviton is calculated, and the algorithm to detect the massive graviton is presented. We conclude that, with 90% probability, massless gravitons can be distinguished from gravitons heavier than 3 x 10{sup -22} eV (Compton wavelength {lambda}{sub g} = 4.1 x 10{sup 12} km), if bi-weekly observation of 60 pulsars is performed for 5 years with a pulsar rms timing accuracy of 100 ns. If 60 pulsars are observed for 10 years with the same accuracy, the detectable graviton mass is reduced to 5 x 10{sup -23} eV ({lambda}{sub g} = 2.5 x 10{sup 13} km); for 5 year observations of 100 or 300 pulsars, the sensitivity is respectively 2.5 x 10{sup -22} ({lambda}{sub g} = 5.0 x 10{sup 12} km) and 10{sup -22} eV ({lambda}{sub g} = 1.2 x 10{sup 13} km). Finally, a 10 year observation of 300 pulsars with 100 ns timing accuracy would probe graviton masses down to 3 x 10{sup -23} eV ({lambda}{sub g} = 4.1 x 10{sup 13} km).

Lee, Kejia; Kramer, Michael [University of Manchester, School of Physics and Astronomy, Jodrell Bank Centre for Astrophysics, Alan Turing Building, Manchester M13 9PL (United Kingdom); Jenet, Fredrick A.; Price, Richard H. [Department of Physics and Astronomy, University of Texas at Brownsville, Brownsville, TX 78520 (United States); Wex, Norbert, E-mail: kjlee@mpifr-bonn.mpg.d [Max-Planck-Institut fuer Radioastronomie, Bonn 53121 (Germany)

2010-10-20T23:59:59.000Z

296

Assessment of Energy Efficiency Improvement and CO2 Emission Reduction Potentials in the Cement Industry in China  

E-Print Network [OSTI]

Wang, L. , 2008. Alternative fuel using and waste materialPolicy Research on Alternative Fuels for Cement Industry inis very little use of alternative fuels (defined as waste

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

297

Bottom-up Representation of Industrial Energy Efficiency Technologies in Integrated Assessment Models for the Cement Sector  

E-Print Network [OSTI]

Advanced Concepts of Waste Heat Recovery in Cement Plants”building controls, waste heat recovery or adjustable speedquantities of low grade waste heat from the kilns or clinker

Sathaye, J.

2011-01-01T23:59:59.000Z

298

Permeability of consolidated incinerator facility wastes stabilized with portland cement  

SciTech Connect (OSTI)

The Consolidated Incinerator Facility (CIF) at the Savannah River Site (SRS) burns low-level radioactive wastes and mixed wastes as a method of treatment and volume reduction. The CIF generates secondary waste, which consists of ash and offgas scrubber solution. Currently the ash is stabilized/solidified in the Ashcrete process. The scrubber solution (blowdown) is sent to the SRS Effluent Treatment Facility (ETF) for treatment as wastewater. In the past, the scrubber solution was also stabilized/solidified in the Ashcrete process as blowcrete, and will continue to be treated this way for listed waste burns and scrubber solutions that do not meet the ETF Waste Acceptance Criteria (WAC). The disposal plan for Ashcrete and special case blowcrete is to bury these containerized waste forms in shallow unlined trenches in E-Area. The WAC for intimately mixed, cement-based wasteforms intended for direct disposal specifies limits on compressive strength and permeability. Simulated waste and actual CIF ash and scrubber solution were mixed in the laboratory and cast into wasteforms for testing. Test results and related waste disposal consequences are given in this report.

Walker, B.W.

2000-04-19T23:59:59.000Z

299

Production of cements from Illinois coal ash. Technical report, September 1, 1995--November 30, 1995  

SciTech Connect (OSTI)

The objective of this program is to convert Illinois coal combustion residues, such as fly ash, bottom ash, and boiler slag, into novel cementitious materials for use in the construction industry. Currently only about 30% of the 5 million tons of these coal combustion residues generated in Illinois each year are utilized, mainly as aggregate. These residues are composed largely Of SiO{sub 2}, Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, MgO, and CaO, which are also the major components of cement. The process being developed in this program will use the residues directly in the manufacture of cement products. Therefore, a much larger amount of residues can be utilized. To achieve the above objective, in the first phase (current year) samples of coal combustion residues will be blended and mixed, as needed, with a lime or cement kiln dust (CKD) to adjust the CaO composition. Six mixtures will be melted in a laboratory-scale furnace at CTL. The resulting products will then be tested for cementitious properties. Two preliminary blends have been tested. One blend used fly ash with limestone, while the other used fly ash with CKD. Each blend was melted and then quenched, and the resulting product samples were ground to a specific surface area similar to portland cement. Cementitious properties of these product samples were evaluated by compression testing of 1-inch cube specimens. The specimens were formed out of cement paste where a certain percentage of the cement paste is displaced by one of the sample products. The specimens were cured for 24 hours at 55{degrees}C and 100% relative humidity. The specimens made with the product samples obtained 84 and 89% of the strength of a pure portland cement control cube. For comparison, similar (pozzolanic) materials in standard concrete practice are required to have a compressive strength of at least 75% of that of the control.

Wagner, J.C. [Institute of Gas Technology, Chicago, IL (United States); Bhatty, J.I.; Mishulovich, A. [Construction Technology Labs., Inc., Washington, DC (United States)

1995-12-31T23:59:59.000Z

300

Evaluation of cement production using a pressurized fluidized-bed combustor  

SciTech Connect (OSTI)

There are several primary conclusions which can be reached and used to define research required in establishing the feasibility of using PFBC-derived materials as cement feedstock. 1. With appropriate blending almost any material containing the required cement-making materials can be utilized to manufacture cement. However, extensive blending with multiple materials or the use of ash in relatively small quantities would compromise the worth of this concept. 2. The composition of a potential feedstock must be considered not only with respect to the presence of required materials, but just as significantly, with respect to the presence and concentration of known deleterious materials. 3. The processing costs for rendering the feedstock into an acceptable composition and the energy costs associated with both processing and burning must be considered. It should be noted that the cost of energy to produce cement, expressed as a percentage of the price of the product is higher than for any other major industrial product. Energy consumption is, therefore, a major issue. 4. The need for conformance to environmental regulations has a profound effect on the cement industry since waste materials can neither be discharged to the atmosphere or be shipped to a landfill. 5. Fifth, the need for achieving uniformity in the composition of the cement is critical to controlling its quality. Unfortunately, certain materials in very small concentrations have the capability to affect the rate and extent to which the cementitious compound in portland cement are able to form. Particularly critical are variations in the ash, the sulfur content of the coal or the amount and composition of the stack dust returned to the kiln.

DeLallo, M.; Eshbach, R.

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Energy efficiency for greenhouse gas emission reduction in China: The case of the cement industry  

SciTech Connect (OSTI)

A project at LBNL has combined two different approaches to investigate changes in efficiency in China`s cement industry, which currently accounts for over 6% of China`s total commercial energy use and over 1% of global carbon emissions. Cement output has doubled over the past five years, and will double again within 15 years. Addressing cement industry carbon emissions will be a key element of any program to control China`s carbon emissions. Macro-level analysis was used to investigate industry-wide trends, and detailed case studies of individual plants illuminated key issues in technology choice that fundamentally affect efficiency. In general, enterprises adopted technologies that increased output and improved quality, and had little regard for energy efficiency, though most new technologies and practices did improve efficiency. Changes in energy prices were a surprisingly weak factor in adoption of efficient technologies. Unexpectedly, many enterprises developed a strong preference for the least fuel-efficient technology, which allows power generation with kiln waste heat. This preference was motivated in a large part by the desire to achieve security in electricity supply, and by some reforms. This alternative has become increasingly popular, and threatens to reverse some progress made in reducing the carbon-intensiveness of China`s cement industry. Foreign technical assistance and more importantly, greater participation in China`s cement industry of foreign cement companies would speed the adoption of large scale very efficient precalciner plants. Paradoxically, improving energy efficiency in China`s cement industry is also a supply-side issue, improved reliability in China`s power network will make the more fuel-efficient alternative more attractive.

Sinton, J. [Lawrence Berkeley National Lab., Berkeley, CA (United States)

1996-12-31T23:59:59.000Z

302

Massive Disks in Low Surface Brightness Galaxies  

E-Print Network [OSTI]

An update of the set of low surface brightness galaxies is presented which can be used to set constraints on the otherwise ambiguous decompositions of their rotation curves into contributions due to the various components of the galaxies. The selected galaxies show all clear spiral structure and arguments of density wave theory of galactic spiral arms are used to estimate the masses of the galactic disks. Again these estimates seem to indicate that the disks of low surface brightness galaxies might be much more massive than currently thought. This puzzling result contradicts stellar population synthesis models. This would mean also that low surface brightness galaxies are not dominated by dark matter in their inner parts.

B. Fuchs

2002-09-09T23:59:59.000Z

303

Progress in the physics of massive neutrinos  

E-Print Network [OSTI]

The current status of the physics of massive neutrinos is reviewed with a forward-looking emphasis. The article begins with the general phenomenology of neutrino oscillations in vacuum and matter and documents the experimental evidence for oscillations of solar, reactor, atmospheric and accelerator neutrinos. Both active and sterile oscillation possibilities are considered. The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae, highest energy cosmic rays) on neutrino observables and vice versa, is evaluated. The predictions of grand unified, radiative and other models of neutrino mass are discussed. Ways of determining the unknown parameters of three-neutrino oscillations are assessed, taking into account eight-fold degeneracies in parameters that yield the same oscillation probabilities, as well as ways to determine the absolute neutrino mass scale (from beta-decay, neutrinoless double-beta decay, large scale structure and Z-bursts). Critical unknowns at present are the amplitude of \

V. Barger; D. Marfatia; K. Whisnant

2003-09-16T23:59:59.000Z

304

Graphene-enabled Wireless Communication for Massive Multicore Architectures  

E-Print Network [OSTI]

Graphene-enabled Wireless Communication for Massive Multicore Architectures Sergi Abadal, Eduard. This goal is feasible by using graphene-based planar antennas, which can radiate signals at the Terahertz, this is the first work that discusses the utilization of graphene-enabled wireless communication for massive

Cabellos-Aparicio, Albert

305

LIMITING ACCRETION ONTO MASSIVE STARS BY FRAGMENTATION-INDUCED STARVATION  

SciTech Connect (OSTI)

Massive stars influence their surroundings through radiation, winds, and supernova explosions far out of proportion to their small numbers. However, the physical processes that initiate and govern the birth of massive stars remain poorly understood. Two widely discussed models are monolithic collapse of molecular cloud cores and competitive accretion. To learn more about massive star formation, we perform and analyze simulations of the collapse of rotating, massive, cloud cores including radiative heating by both non-ionizing and ionizing radiation using the FLASH adaptive-mesh refinement code. These simulations show fragmentation from gravitational instability in the enormously dense accretion flows required to build up massive stars. Secondary stars form rapidly in these flows and accrete mass that would have otherwise been consumed by the massive star in the center, in a process that we term fragmentation-induced starvation. This explains why massive stars are usually found as members of high-order stellar systems that themselves belong to large clusters containing stars of all masses. The radiative heating does not prevent fragmentation, but does lead to a higher Jeans mass, resulting in fewer and more massive stars than would form without the heating. This mechanism reproduces the observed relation between the total stellar mass in the cluster and the mass of the largest star. It predicts strong clumping and filamentary structure in the center of collapsing cores, as has recently been observed. We speculate that a similar mechanism will act during primordial star formation.

Peters, Thomas; Klessen, Ralf S.; Banerjee, Robi [Institut fuer Theoretische Astrophysik, Zentrum fuer Astronomie der Universitaet Heidelberg, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany); Low, Mordecai-Mark Mac, E-mail: thomas.peters@ita.uni-heidelberg.d [Department of Astrophysics, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024-5192 (United States)

2010-12-10T23:59:59.000Z

306

Hypervelocity binary stars: smoking gun of massive binary black holes  

E-Print Network [OSTI]

The hypervelocity stars recently found in the Galactic halo are expelled from the Galactic center through interactions between binary stars and the central massive black hole or between single stars and a hypothetical massive binary black hole. In this paper, we demonstrate that binary stars can be ejected out of the Galactic center with velocities up to 10^3 km/s, while preserving their integrity, through interactions with a massive binary black hole. Binary stars are unlikely to attain such high velocities via scattering by a single massive black hole or through any other mechanisms. Based on the above theoretical prediction, we propose a search for binary systems among the hypervelocity stars. Discovery of hypervelocity binary stars, even one, is a definitive evidence of the existence of a massive binary black hole in the Galactic center.

Youjun Lu; Qingjuan Yu; D. N. C. Lin

2007-07-22T23:59:59.000Z

307

In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction  

SciTech Connect (OSTI)

Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here, we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA cements. Rietveld quantitative phase analysis has been used to establish the degree of reaction (?). The hydration of a mixture of ye'elimite and gypsum revealed that ettringite formation (? ? 70% at 50 h) is limited by ye'elimite dissolution. Two laboratory-prepared BCSA cements were also studied: non-active-BCSA and active-BCSA cements, with ?- and ??{sub H}-belite as main phases, respectively. Ye'elimite, in the non-active-BCSA system, dissolves at higher pace (? ? 25% at 1 h) than in the active-BCSA one (? ? 10% at 1 h), with differences in the crystallization of ettringite (? ? 30% and ? ? 5%, respectively). This behavior has strongly affected subsequent belite and ferrite reactivities, yielding stratlingite and other layered phases in non-active-BCSA. The dissolution and crystallization processes are reported and discussed in detail. -- Highlights: •Belite calcium sulfoaluminate cements early hydration mechanism has been determined. •Belite hydration strongly depends on availability of aluminum hydroxide. •Orthorhombic ye’elimite dissolved at a higher pace than cubic one. •Ye’elimite larger reaction degree yields stratlingite formation by belite reaction. •Rietveld method quantified gypsum, anhydrite and bassanite dissolution rates.

Álvarez-Pinazo, G.; Cuesta, A.; García-Maté, M.; Santacruz, I.; Losilla, E.R. [Departamento de Química Inorgánica, Universidad de Málaga, Campus Teatinos S/N., 29071 Málaga (Spain)] [Departamento de Química Inorgánica, Universidad de Málaga, Campus Teatinos S/N., 29071 Málaga (Spain); Sanfélix, S.G. [Unidad Técnica de Investigación de Materiales, AIDICO, Avda. Benjamín Franklin, 17 Paterna, Valencia (Spain)] [Unidad Técnica de Investigación de Materiales, AIDICO, Avda. Benjamín Franklin, 17 Paterna, Valencia (Spain); Fauth, F. [CELLS-Alba synchrotron, Carretera BP 1413, Km. 3.3, E-08290 Cerdanyola, Barcelona (Spain)] [CELLS-Alba synchrotron, Carretera BP 1413, Km. 3.3, E-08290 Cerdanyola, Barcelona (Spain); Aranda, M.A.G. [Departamento de Química Inorgánica, Universidad de Málaga, Campus Teatinos S/N., 29071 Málaga (Spain) [Departamento de Química Inorgánica, Universidad de Málaga, Campus Teatinos S/N., 29071 Málaga (Spain); CELLS-Alba synchrotron, Carretera BP 1413, Km. 3.3, E-08290 Cerdanyola, Barcelona (Spain); De la Torre, A.G., E-mail: mgd@uma.es [Departamento de Química Inorgánica, Universidad de Málaga, Campus Teatinos S/N., 29071 Málaga (Spain)

2014-02-15T23:59:59.000Z

308

Determining the slag fraction, water/binder ratio and degree of hydration in hardened cement pastes  

SciTech Connect (OSTI)

A method for determining the original mix composition of hardened slag-blended cement-based materials based on analysis of backscattered electron images combined with loss on ignition measurements is presented. The method does not require comparison to reference standards or prior knowledge of the composition of the binders used. Therefore, it is well-suited for application to real structures. The method is also able to calculate the degrees of reaction of slag and cement. Results obtained from an experimental study involving sixty samples with a wide range of water/binder (w/b) ratios (0.30 to 0.50), slag/binder ratios (0 to 0.6) and curing ages (3 days to 1 year) show that the method is very promising. The mean absolute errors for the estimated slag, water and cement contents (kg/m{sup 3}), w/b and s/b ratios were 9.1%, 1.5%, 2.5%, 4.7% and 8.7%, respectively. 91% of the estimated w/b ratios were within 0.036 of the actual values. -- Highlights: •A new method for estimating w/b ratio and slag content in cement pastes is proposed. •The method is also able to calculate the degrees of reaction of slag and cement. •Reference standards or prior knowledge of the binder composition are not required. •The method was tested on samples with varying w/b ratios and slag content.

Yio, M.H.N., E-mail: marcus.yio11@imperial.ac.uk; Phelan, J.C.; Wong, H.S.; Buenfeld, N.R.

2014-02-15T23:59:59.000Z

309

Evaluation of in-situ cemented backfill performance. Rept. of Investigations/1991  

SciTech Connect (OSTI)

As part of its research program to investigate ways of improving resource recovery and reducing subsidence, researchers from the U.S. Bureau of Mines placed instruments in the B-North ore body of the Cannon Mine, Wenatchee, WA, to monitor cemented backfill and rock deformation during mining. The vibrating-wire guages proved to be reliable and versatile, and approximately half of the instruments are providing data after 2 years of use. A two-dimensional, finite-element model was used to analyze the Cannon Mine's multilevel bench cut-and-fill mining method and predict rock and backfill displacements. The model accurately predicted rock displacements, but the predicted and measured displacements in cemented backfill had a correlation coefficient near zero, indicating that the model should only be used to predict rock displacements and not backfill displacements. A finite-difference model was also used to evaluate the stability of a cemented backfill pillar. Results can be used to conservatively predict backfill stresses, but on-site observations of pillar failures coupled with in situ measurements are needed to make more accurate predictions. An ongoing evaluation of the mining system has indicated that filling the primary stopes tight to the back with cemented backfill allowed these pillars to carry overburden loads soon after the cemented backfill was placed.

Tesarik, D.R.; Vickery, J.D.; Seymour, J.B.

1991-01-01T23:59:59.000Z

310

X-ray Emission from Massive StarsX-ray Emission from Massive Stars David CohenDavid Cohen  

E-Print Network [OSTI]

X-ray Emission from Massive StarsX-ray Emission from Massive Stars David CohenDavid Cohen/s)Velocity (km/s) #12;absorption emission emission occulted emission emission UV telescope side side front back #12;absorption emission emission occulted emission emission UV telescope side side front back #12;The

Cohen, David

311

International Best Practices for Pre-Processing and Co-Processing Municipal Solid Waste and Sewage Sludge in the Cement Industry  

E-Print Network [OSTI]

least two seconds. ” The waste heat from the co-processingis drawn from the waste heat of the associated cementSewage sludge drying using waste heat from cement plant flue

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

312

Influence of curing temperature on cement hydration and mechanical strength development of fly ash mortars  

SciTech Connect (OSTI)

The influence of fly ash and curing temperature on cement hydration and compressive strength development of mortars was investigated. Test parameters included type of fly ash (two different Class F fly ashes were tested), the level of cement replacement (10, 20 and 30% by mass), and curing temperature (20 C and 40 C). The mortar physical and microstructural properties were determined by means of thermal analyses, compressive strength measurements and SEM observations. Test results confirm that fly ash tends to increase significantly the rate of cement hydration at early age. Data also demonstrate that an elevation of the curing temperature reduces the long-term compressive strength of the reference mortar mixture. In contrast, an increase of the curing temperature seems to have no detrimental effect on the long-term compressive strength of the fly ash mixtures.

Maltais, Y.; Marchand, J. [Univ. Laval, Quebec (Canada). Centre de Recherche Interuniversitaire sur le Beton] [Univ. Laval, Quebec (Canada). Centre de Recherche Interuniversitaire sur le Beton

1997-07-01T23:59:59.000Z

313

Carbon black: A low cost colloidal additive for controlling gas-migration in cement slurries  

SciTech Connect (OSTI)

The effect of different additives on the permeability of cement slurries to formation gas has been studied with the aid of a gas flow apparatus. The performance of two commercial additives (polymer latex and silica fume) has been compared to that of a novel additive (carbon black) that has been developed in the authors laboratories with the aim of simplifying the cement slurry composition and reducing field operational costs. Data on the thickening time, fluid loss, rheology and compressive strength are also presented to provide a clear picture of the potential of carbon black as a substitute for silica fume and polymer latex in some field applications. Finally, the paper describes the results of a field application using carbon black as a gas-block additive in the cement slurry.

Calloni, G.; Moroni, N.; Miano, F.

1995-11-01T23:59:59.000Z

314

Effects of aluminosilicate minerals in clay soil fractions on pore water hydroxide ion concentrations in soil/cement matrices  

E-Print Network [OSTI]

form of montmorillonite, with 0. 5, 10, 20, and 40 percent bentonite by total, air-dry weight were mixed with Type I Portland cement at 10, 20, and 30 percent cement by weight of air-dry soil. Pore water was expressed and analyzed for hydroxide, calcium...

Cook, Evan Russell

1998-01-01T23:59:59.000Z

315

INTRODUCTION Portland cement concrete (PCC) is the world's most versatile and utilized construction material. Modern concrete consists of six  

E-Print Network [OSTI]

INTRODUCTION Portland cement concrete (PCC) is the world's most versatile and utilized construction material. Modern concrete consists of six main ingredients: coarse aggregate, sand, portland cement agreement that the use of SCMs has the following effects in concrete: 1. Improved workability and finish

Harms, Kyle E.

316

Occurrence Frequency of CO Outflows in Massive Protostellar Candidates  

E-Print Network [OSTI]

We mapped 12 massive protostellar candidates in the CO J=2-1 line, which in combination with Zhang et al. (2005) completes an unbiased survey of outflows for all 48 sources with l>50^o in a sample of 101 massive protostellar candidates. We detected outflows in 10 sources, implying 88% occurrence frequency of outflows for the 48 sources. This supports the conclusion of previous studies that bipolar outflows are an integral component in the formation process of massive stars. The vast majority of the observed outflows are much more massive (>10~Mo) and energetic (>100~Mo~km/s) than outflows from low-mass protostars. They also have large mass outflow rates (>2x10^{-4}~Mo/yr), suggesting large (~1x10^{-4}~Mo/yr) accretion rates sufficient to overcome radiation pressure of the central massive protostars. We compared the frequency distribution of collimation factors of 40 massive outflows including those of this study with that of 36 low-mass outflows from the literature, and found NO significant difference between the two. All these results are consistent with the suggestion that massive stars form through accretion as do low-mass stars but with much higher accretion rates.

Kee-Tae Kim; S. E. Kurtz

2006-01-24T23:59:59.000Z

317

Temperature Measurement During Polymerization of Bone Cement in Percutaneous Vertebroplasty: An In Vivo Study in Humans  

SciTech Connect (OSTI)

Aim of the study was to 'in vivo' measure temperature, during percutaneous vertebroplasty (PV), within a vertebral body injected with different bone cements. According to the declaration of Helsinki, 22 women (60-80 years; mean, 75 years) with painful osteoporotic vertebral collapse underwent bilateral transpedicular PV on 22 lumbar vertebrae. Two 10-G vertebroplasty needles were introduced into the vertebra under digital fluoroscopy; a 16-G radiofrequency thermoablation needle (Starburst XL; RITA Medical System Inc., USA), carrying five thermocouples, was than coaxially inserted. Eleven different bone cements were injected and temperatures were measured every 30 s until temperatures dropped under 45{sup o}C. After the thermocouple needle was withdrawn, bilateral PV was completed with cement injection through the vertebroplasty needle. Unpaired Student's t-tests, Kruskal-Wallis test, and Wilcoxon signed rank test were used to evaluate significant differences (p < 0.05) in peak temperatures, variations between cements, and clinical outcome. All procedures were completed without complications, achieving good clinical outcomes (p < 0.0001). Regarding average peak temperature, cements were divided into three groups: A (over 60{sup o}C), B (from 50{sup o} to 60{sup o}C), and C (below 50{sup o}C). Peak temperature in Group A (86.7 {+-} 10.7{sup o}C) was significantly higher (p = 0.0172) than that in Groups B (60.5 {+-} 3.7{sup o}C) and C (44.8 {+-} 2.6{sup o}C). The average of all thermocouples showed an extremely significant difference (p = 0.0002) between groups. None of the tested cements maintained a temperature {>=}45{sup o}C for more than 30 min. These data suggest that back-pain improvement is obtained not by thermal necrosis but by mechanical consolidation only. The relative necrotic thermal effect in vertebral metastases seems to confirm that analgesia must be considered the main intent of PV.

Anselmetti, Giovanni Carlo, E-mail: giovanni.anselmetti@ircc.it; Manca, Antonio [Institute for Cancer Research and Treatment (IRCC), Interventional Radiology Unit (Italy); Kanika, Khanna; Murphy, Kieran [Johns Hopkins Hospital, Radiology and Radiological Science (United States); Eminefendic, Haris [Institute for Cancer Research and Treatment (IRCC), Radiology Unit (Italy); Masala, Salvatore ['Tor Vergata' University General Hospital, Department of Diagnostic Imaging, Molecular Imaging, Interventional Radiology and Radiotherapy (Italy); Regge, Daniele [Institute for Cancer Research and Treatment (IRCC), Radiology Unit (Italy)

2009-05-15T23:59:59.000Z

318

Characterising Vainshtein Solutions in Massive Gravity  

E-Print Network [OSTI]

We study static, spherically symmetric solutions in a recently proposed ghost-free model of non-linear massive gravity. We focus on a branch of solutions where the helicity-0 mode can be strongly coupled within certain radial regions, giving rise to the Vainshtein effect. We truncate the analysis to scales below the gravitational Compton wavelength, and consider the weak field limit for the gravitational potentials, while keeping all non-linearities of the helicity-0 mode. We determine analytically the number and properties of local solutions which exist asymptotically on large scales, and of local (inner) solutions which exist on small scales. We find two kinds of asymptotic solutions, one of which is asymptotically flat, while the other one is not, and also two types of inner solutions, one of which displays the Vainshtein mechanism, while the other exhibits a self-shielding behaviour of the gravitational field. We analyse in detail in which cases the solutions match in an intermediate region. The asymptotically flat solutions connect only to inner configurations displaying the Vainshtein mechanism, while the non asymptotically flat solutions can connect with both kinds of inner solutions. We show furthermore that there are some regions in the parameter space where global solutions do not exist, and characterise precisely in which regions of the phase space the Vainshtein mechanism takes place.

Fulvio Sbisa'; Gustavo Niz; Kazuya Koyama; Gianmassimo Tasinato

2014-06-17T23:59:59.000Z

319

MASSIVE HYBRID PARALLELISM FOR FULLY IMPLICIT MULTIPHYSICS  

SciTech Connect (OSTI)

As hardware advances continue to modify the supercomputing landscape, traditional scientific software development practices will become more outdated, ineffective, and inefficient. The process of rewriting/retooling existing software for new architectures is a Sisyphean task, and results in substantial hours of development time, effort, and money. Software libraries which provide an abstraction of the resources provided by such architectures are therefore essential if the computational engineering and science communities are to continue to flourish in this modern computing environment. The Multiphysics Object Oriented Simulation Environment (MOOSE) framework enables complex multiphysics analysis tools to be built rapidly by scientists, engineers, and domain specialists, while also allowing them to both take advantage of current HPC architectures, and efficiently prepare for future supercomputer designs. MOOSE employs a hybrid shared-memory and distributed-memory parallel model and provides a complete and consistent interface for creating multiphysics analysis tools. In this paper, a brief discussion of the mathematical algorithms underlying the framework and the internal object-oriented hybrid parallel design are given. Representative massively parallel results from several applications areas are presented, and a brief discussion of future areas of research for the framework are provided.

Cody J. Permann; David Andrs; John W. Peterson; Derek R. Gaston

2013-05-01T23:59:59.000Z

320

Radiation Pressure in Massive Star Formation  

E-Print Network [OSTI]

Stars with masses of >~ 20 solar masses have short Kelvin times that enable them to reach the main sequence while still accreting from their natal clouds. The resulting nuclear burning produces a huge luminosity and a correspondingly large radiation pressure force on dust grains in the accreting gas. This effect may limit the upper mass of stars that can form by accretion. Indeed, simulations and analytic calculations to date have been unable to resolve the mystery of how stars of 50 solar masses and up form. We present two new ideas to solve the radiation pressure problem. First, we use three-dimensional radiation hydrodynamic adaptive mesh refinement simulations to study the collapse of massive cores. We find that in three dimensions a configuration in which radiation holds up an infalling envelope is Rayleigh-Taylor unstable, leading radiation driven bubbles to collapse and accretion to continue. We also present Monte Carlo radiative transfer calculations showing that the cavities created by protostellar winds provides a valve that allow radiation to escape the accreting envelope, further reducing the ability of radiation pressure to inhibit accretion.

Mark R. Krumholz; Richard I. Klein; Christopher F. McKee

2005-10-14T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Massive stars in their death-throes  

E-Print Network [OSTI]

The study of the stars that explode as supernovae used to be a forensic study, working backwards from the remnants of the star. This changed in 1987 when the first progenitor star was identified in pre-explosion images. Currently there are 8 detected progenitors with another 21 non-detections, for which only a limit on the pre-explosion luminosity can be placed. This new avenue of supernova research has led to many interesting conclusions, most importantly that the progenitors of the most common supernovae, type IIP, are red supergiants as theory has long predicted. However no progenitors have been detected thus far for the hydrogen-free type Ib/c supernovae which, given the expected progenitors, is an unlikely result. Also observations have begun to show evidence that luminous blue variables, which are among the most massive stars, may directly explode as supernovae. These results contradict current stellar evolution theory. This suggests that we may need to update our understanding.

J. J. Eldridge

2008-09-11T23:59:59.000Z

322

Superenergy tensors for a massive scalar field  

E-Print Network [OSTI]

We define a general class of superenergy tensors of even rank 2(n+1) for a real massive scalar field propagating in Minkowski spacetime. In the case where n=1, we establish that this class is a two-parameter family, which reduces to a unique tensor W(up to a constant factor) when the complete symmetry on the four indices is required. We show that the superenergy density $W^{\\al\\ba\\ga\\da}u_{\\al}u_{\\ba}u_{\\ga}u_{\\da}$ relative to any timelike unit vector $u$ is positive definite and that the supermomentum density $W^{\\al\\ba\\ga\\da}u_{\\ba}u_{\\ga}u_{\\da}$ is a timelike or a null vector ($W^{\\al\\ba\\ga\\da}$ stands for W). Next, we find an infinite set of conserved tensors $U_{(p,q)}$ of rank 2+p+q, that we call weak superenergy tensors of order n when p=q=n. We show that $U_{(1,1)}$ and W yield the same total superenergy and the same total supermomentum. Then, using the canonical quantization scheme, we construct explicitly the superhamiltonian and the supermomentum operators corresponding to W and to each weak superenergy tensor $U_{(n,n)}$. Finally, we exhibit a two-parameter family of superenergy tensors for an electromagnetic field and for a gravitational field.

P. Teyssandier

1999-05-20T23:59:59.000Z

323

MASSIVE BLACK HOLES IN CENTRAL CLUSTER GALAXIES  

SciTech Connect (OSTI)

We explore how the co-evolution of massive black holes (MBHs) and galaxies is affected by environmental effects, addressing in particular MBHs hosted in the central cluster galaxies (we will refer to these galaxies in general as ''CCGs''). Recently, the sample of MBHs in CCGs with dynamically measured masses has increased, and it has been suggested that these MBH masses (M{sub BH}) deviate from the expected correlations with velocity dispersion ({sigma}) and mass of the bulge (M{sub bulge}) of the host galaxy: MBHs in CCGs appear to be ''overmassive''. This discrepancy is more pronounced when considering the M{sub BH}-{sigma} relation than the M{sub BH}-M{sub bulge} one. We show that this behavior stems from a combination of two natural factors: (1) CCGs experience more mergers involving spheroidal galaxies and their MBHs and (2) such mergers are preferentially gas poor. We use a combination of analytical and semi-analytical models to investigate the MBH-galaxy co-evolution in different environments and find that the combination of these two factors is in accordance with the trends observed in current data sets.

Volonteri, Marta [Institut d'Astrophysique de Paris, 98bis Bd. Arago, F-75014 Paris (France); Ciotti, Luca [Dipartimento di Fisica e Astronomia, Universita di Bologna, via Ranzani 1, I-40127 Bologna (Italy)

2013-05-01T23:59:59.000Z

324

Massive hybrid parallelism for fully implicit multiphysics  

SciTech Connect (OSTI)

As hardware advances continue to modify the supercomputing landscape, traditional scientific software development practices will become more outdated, ineffective, and inefficient. The process of rewriting/retooling existing software for new architectures is a Sisyphean task, and results in substantial hours of development time, effort, and money. Software libraries which provide an abstraction of the resources provided by such architectures are therefore essential if the computational engineering and science communities are to continue to flourish in this modern computing environment. The Multiphysics Object Oriented Simulation Environment (MOOSE) framework enables complex multiphysics analysis tools to be built rapidly by scientists, engineers, and domain specialists, while also allowing them to both take advantage of current HPC architectures, and efficiently prepare for future supercomputer designs. MOOSE employs a hybrid shared-memory and distributed-memory parallel model and provides a complete and consistent interface for creating multiphysics analysis tools. In this paper, a brief discussion of the mathematical algorithms underlying the framework and the internal object-oriented hybrid parallel design are given. Representative massively parallel results from several applications areas are presented, and a brief discussion of future areas of research for the framework are provided. (authors)

Gaston, D. R.; Permann, C. J.; Andrs, D.; Peterson, J. W. [Idaho National Laboratory, 2525 N. Fremont Ave., Idaho Falls, ID 83415 (United States)

2013-07-01T23:59:59.000Z

325

MACHO (MAssive Compact Halo Objects) Data  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The primary aim of the MACHO Project is to test the hypothesis that a significant fraction of the dark matter in the halo of the Milky Way is made up of objects like brown dwarfs or planets: these objects have come to be known as MACHOs, for MAssive Compact Halo Objects. The signature of these objects is the occasional amplification of the light from extragalactic stars by the gravitational lens effect. The amplification can be large, but events are extremely rare: it is necessary to monitor photometrically several million stars for a period of years in order to obtain a useful detection rate. For this purpose MACHO has a two channel system that employs eight CCDs, mounted on the 50 inch telescope at Mt. Stromlo. The high data rate (several GBytes per night) is accommodated by custom electronics and on-line data reduction. The Project has taken more than 27,000 images with this system since June 1992. Analysis of a subset of these data has yielded databases containing light curves in two colors for 8 million stars in the LMC and 10 million in the bulge of the Milky Way. A search for microlensing has turned up four candidates toward the Large Magellanic Cloud and 45 toward the Galactic Bulge. The web page for data provides links to MACHO Project data portals and various specialized interfaces for viewing or searching the data. (Specialized Interface)

326

Ghabezloo: Micromechanics analysis of thermal expansion and thermal pressurization of a hardened cement paste Micromechanics analysis of thermal expansion and thermal  

E-Print Network [OSTI]

pore fluid is anomalously higher than the one of pure bulk water. The micromechanics model water-to-cement ratios. It permits also to calculate the pore volume thermal expansion coefficient expansion and thermal pressurization of a hardened cement paste, Cement and Concrete Research, DOI 10.1016/j

Boyer, Edmond

327

A cement kiln flue-dust evaluated as a soil liming material  

E-Print Network [OSTI]

A CEMENT KILN FLUE-DUST EVALUATED AS A SOIl LIMING MATERIAL A Thesis by RAIMUND STACHA Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE 1973 NJSbj t...:~StlCh tt A CEMENT KILN FLUE-DUST EVALUATED AS A SOIL I IMING MATERIAL A Thesis by RAIMUND STACHA Approved as to style and content by: (Chairman of Committee) (Head of Department) (Me er) (Member) (Member) (Member) (Member) 1973 ABSTRACT A...

Stacha, Raimund

1973-01-01T23:59:59.000Z

328

CSER 00-001 Criticality Safety Evaluation Report for Cementation Operations at the PFP  

SciTech Connect (OSTI)

Glovebox HA-20MB is located in Room 235B of the 234-5Z Building at the Plutonium Finishing Plant. This enclosure contains mixers, mixer bowls, a crusher unit, an isolated inoperable conveyor unit, plutonium residue feed cans, cemented cans, and a feedwater container. Plutonium residue, not conducive to other forms of stabilization, is prepared for storage and ultimate disposal by cementation. The feed residue material cans can have plutonium contents of only a few grams or up to 200 grams. This evaluation accommodates this wide range of container fissile concentrations.

DOBBIN, K.D.

2000-04-18T23:59:59.000Z

329

Soil stabilization and pavement recycling with self-cementing coal fly ash  

SciTech Connect (OSTI)

This manual provides design information for self-cementing coal fly ash as the sole stabilizing agent for a wide range of engineering applications. As in any process, the application of sound engineering practices, appropriate testing, and evaluation of fly ash quality and characteristics will lend themselves to successful projects using the guidelines in this manual. Topics discussed include: self-cementing coal fly ash characteristics; laboratory mix design; stabilization of clay soils; stabilisation of granular materials; construction considerations; high sulfate ash; environmental considerations for fly ash stabilization; design considerations; state specification/guidelines/standards; and a sample of a typical stabilization specification.

NONE

2008-01-15T23:59:59.000Z

330

Tensile creep of soil-cement and its relationship to fatigue  

E-Print Network [OSTI]

Creep curves at different temperatures. 19 Log (D(t)-Dz) vs. log t at different temperatures. 68 69 INTRODUCTION Portland cement is an extremely important stabilizing agent for a wide range of soil types. Because of its strength-enhancing property... Mechanics (LEFM) is applicable to the investigation and determination of realistic failure criteria of fine-grained soils stabilized with Portland cement [27]. This is due to the fact that the radius of curvature at the tip of a microcrack is small...

Kim, Youngsoo

1985-01-01T23:59:59.000Z

331

E-Print Network 3.0 - aicha massive sulphide Sample Search Results  

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

Canada Geological origin Solid specific gravity 3.4 g... Mineralogy (XRD) Conditioning processing Volcanic massive deposit, Portugal Volcanic massive deposit... , Portugal...

332

A Signal-Inducing Bone Cement for Magnetic Resonance Imaging-Guided Spinal Surgery Based on Hydroxyapatite and Polymethylmethacrylate  

SciTech Connect (OSTI)

The aim of this study was to develop a signal-inducing bone cement for magnetic resonance imaging (MRI)-guided cementoplasty of the spine. This MRI cement would allow precise and controlled injection of cement into pathologic lesions of the bone. We mixed conventional polymethylmethacrylate bone cement (PMMA; 5 ml methylmethacrylate and 12 g polymethylmethacrylate) with hydroxyapatite (HA) bone substitute (2-4 ml) and a gadolinium-based contrast agent (CA; 0-60 {mu}l). The contrast-to-noise ratio (CNR) of different CA doses was measured in an open 1.0-Tesla scanner for fast T1W Turbo-Spin-Echo (TSE) and T1W TSE pulse sequences to determine the highest signal. We simulated MRI-guided cementoplasty in cadaveric spines. Compressive strength of the cements was tested. The highest CNR was (1) 87.3 (SD 2.9) in fast T1W TSE for cements with 4 {mu}l CA/ml HA (4 ml) and (2) 60.8 (SD 2.4) in T1W TSE for cements with 1 {mu}l CA/ml HA (4 ml). MRI-guided cementoplasty in cadaveric spine was feasible. Compressive strength decreased with increasing amounts of HA from 46.7 MPa (2 ml HA) to 28.0 MPa (4 ml HA). An MRI-compatible cement based on PMMA, HA, and CA is feasible and clearly visible on MRI images. MRI-guided spinal cementoplasty using this cement would permit direct visualization of the cement, the pathologic process, and the anatomical surroundings.

Wichlas, Florian, E-mail: florian.wichlas@charite.de; Seebauer, Christian J.; Schilling, Rene [University Charite, Center for Musculoskeletal Surgery (Germany); Rump, Jens [University Charite, Department of Radiology (Germany); Chopra, Sascha S. [University Charite, Center for Musculoskeletal Surgery (Germany); Walter, Thula; Teichgraeber, Ulf K. M. [University Charite, Department of Radiology (Germany); Bail, Hermann J. [University Charite, Center for Musculoskeletal Surgery (Germany)

2012-06-15T23:59:59.000Z

333

au 99mtc-depreotide pour: Topics by E-print Network  

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

de leur systme : un jeu de rles pour des projets collectifs d'irrigation au Tadla (Maroc) Physics Websites Summary: collectifs d'irrigation au Tadla (Maroc) M. Dionnet1, M....

334

Apports des rseaux baysiens pour la sret et la mise en scurit des infrastructures ptrolires offshore  

E-Print Network [OSTI]

offshore Contributions of Bayesian networks for safety and security of offshore oil infrastructures Xavier.000 champs offshore, impliquant chacun d'une part un ensemble d'équipements pour extraire, traiter et stocker

Paris-Sud XI, Université de

335

Notes pour une histoire de l'opinion publique comme catgorie du discours politique Sandro Landi  

E-Print Network [OSTI]

délibération (dans le champ grec ou persan) et nomoi pour définir des opinions enracinées dans un groupe humain

Paris-Sud XI, Université de

336

L'importance des probabilits a priori pour la recherche des pages d'entre1  

E-Print Network [OSTI]

Search », Proceedings of the 25th annual international ACM SIGIR Conference on Research and Cevelopment structure des liens, les URL et les textes d'ancrage sont des sources intéressantes d'information pour la

Hiemstra, Djoerd

337

E-Print Network 3.0 - avenir pour les Sample Search Results  

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

Collection: Biology and Medicine 2 Tables des principaux minerais d'uranium et de thorium Summary: tre complte ni les indi- cations dtailles. Elle n'a pour but actuel...

338

presentee pour obtenir le grade de Docteur de l'Universite Louis Pasteur -Strasbourg I  

E-Print Network [OSTI]

et son go^ut pour la recherche. Ce travail a ´et´e r´ealis´e au LSIIT (Laboratoire des Sciences de l

Boyer, Edmond

339

Pour l'obtention du Grade de Docteur de l'Universite de Poitiers  

E-Print Network [OSTI]

´e go^ut `a ces disciplines ainsi que Monsieur Jacques Bor´ee qui a su ´eveiller ma curiosit´e pour la

Boyer, Edmond

340

E-Print Network 3.0 - architecture parallele pour Sample Search...  

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

Search Powered by Explorit Topic List Advanced Search Sample search results for: architecture parallele pour Page: << < 1 2 3 4 5 > >> 1 1756 pp. 1756-1781 ANN. TLCOMMUN., 62, n...

Note: This page contains sample records for the topic "massive cement pour" 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

MICRO-CAPTEURS POUR LA GESTION DURABLE DE LA QUALITE DES EAUX Namour Philippe1 *  

E-Print Network [OSTI]

1 MICRO-CAPTEURS POUR LA GESTION DURABLE DE LA QUALITE DES EAUX Namour Philippe1 * , Khadro Basma 2 besoins tant réglementaires (DCE, LEMA) que cognitifs, (exploration du fonctionnement des hydro

Boyer, Edmond

342

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT E DE GRENOBLE  

E-Print Network [OSTI]

of transportation system that presents many advantages. However, even if advertising promotes an image raison du co^ut, du trafic et de la pollution occasionn´ees (surtout pour des syst`emes de voitures

Paris-Sud XI, Université de

343

Phenomenon of electrization caused by gravitation of massive body  

E-Print Network [OSTI]

The value of excess charge in the kernel of massive body (and the opposite in sign excess charge at the surface) caused by the influence of gravitational forces is determined.

D. A. Kirzhnits; A. A. Shatskiy

2000-10-25T23:59:59.000Z

344

Power-Demand Routing in massive geo-distributed systems  

E-Print Network [OSTI]

There is an increasing trend toward massive, geographically distributed systems. The largest Internet companies operate hundreds of thousands of servers in multiple geographic locations, and are growing at a fast clip. A ...

Qureshi, Asfandyar

2010-01-01T23:59:59.000Z

345

An alternative derivation of the Minimal massive 3D gravity  

E-Print Network [OSTI]

By using the algebra of exterior forms and the first order formalism with constraints, an alternative derivation of the field equations for the Minimal massive 3D gravity model is presented.

Ahmet Baykal

2014-08-22T23:59:59.000Z

346

Scalable Parallel Algorithms for Massive Scale-free Graphs  

E-Print Network [OSTI]

Efficiently storing and processing massive graph data sets is a challenging problem as researchers seek to leverage “Big Data” to answer next-generation scientific questions. New techniques are required to process large scale-free graphs in shared...

Pearce, Roger Allan

2013-12-05T23:59:59.000Z

347

Topologically Massive Gravity and Ricci-Cotton Flow  

E-Print Network [OSTI]

We consider Topologically Massive Gravity (TMG), which is three dimensional general relativity with a cosmological constant and a gravitational Chern-Simons term. When the cosmological constant is negative the theory has two potential vacuum solutions: Anti-de Sitter space and Warped Anti-de Sitter space. The theory also contains a massive graviton state which renders these solutions unstable for certain values of the parameters and boundary conditions. We study the decay of these solutions due to the condensation of the massive graviton mode using Ricci-Cotton flow, which is the appropriate generalization of Ricci flow to TMG. When the Chern-Simons coupling is small the AdS solution flows to warped AdS by the condensation of the massive graviton mode. When the coupling is large the situation is reversed, and warped AdS flows to AdS. Minisuperspace models are constructed where these flows are studied explicitly.

Nima Lashkari; Alexander Maloney

2010-09-14T23:59:59.000Z

348

Topologically Massive Gravity and Ricci-Cotton Flow  

E-Print Network [OSTI]

We consider Topologically Massive Gravity (TMG), which is three dimensional general relativity with a cosmological constant and a gravitational Chern-Simons term. When the cosmological constant is negative the theory has two potential vacuum solutions: Anti-de Sitter space and Warped Anti-de Sitter space. The theory also contains a massive graviton state which renders these solutions unstable for certain values of the parameters and boundary conditions. We study the decay of these solutions due to the condensation of the massive graviton mode using Ricci-Cotton flow, which is the appropriate generalization of Ricci flow to TMG. When the Chern-Simons coupling is small the AdS solution flows to warped AdS by the condensation of the massive graviton mode. When the coupling is large the situation is reversed, and warped AdS flows to AdS. Minisuperspace models are constructed where these flows are studied explicitly.

Lashkari, Nima

2010-01-01T23:59:59.000Z

349

Well Technologies for CO2 Geological Storage: CO2-Resistant Cement  

E-Print Network [OSTI]

Résumé — Technologies de puits pour le stockage géologique du CO2: ciment résistant au CO2 — Le stockage souterrain du CO2 est actuellement considéré comme la voie la plus efficace pour une séquestration sure et à faible coût. Cette nouvelle application exige une étanchéité du puits à très long terme. La rupture de la gaine de ciment dans l’intervalle entre le cuvelage et la formation géologique peut créer des chemins préférentiels favorisant la fuite du CO2 vers la surface avec des vitesses probablement supérieures à celles pouvant être provoquées par les fuites au travers des formations géologiques. Il en résultera une perte économique, une réduction de l’efficacité du stockage de CO2 et la remise en cause du champ pour le stockage de CO2. Ce risque potentiel de fuites soulève des questions quant à la bonne iso-lation du puits à long terme et à la durabilité du ciment hydraté utilisé pour isoler l’annulaire entre les intervalles de production et d’injection dans les puits de CO2. Nous proposons une nouvelle procédure expérimentale et une méthodologie pour étudier la réactivité des systèmes CO2-Eau-Ciment en simulant les interactions du ciment pris avec le CO2 injecté à l’état supercritique dans des conditions de fond de puits. Les conditions utilisées pour ces expériences sont de 90ºC et 280 bars. L’évolution des propriétés mécaniques et physico-chimiques du ciment Portland est mesurée dans le temps sur une période maxi-male de six mois. Les résultats sont comparés à ceux obtenus par une étude similaire sur un nouveau

V. Barlet-gouédard; G. Rimmelé; B. Goffé; O. Porcherie

350

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT DE GRENOBLE  

E-Print Network [OSTI]

Humaines » Politique linguistique éducative à l'égard de l'amazighe (berbère) au Maroc : des choix'amazighe (berbère) au Maroc : des choix sociolinguistiques à leur mise en pratique Thèse soutenue publiquement le 8'évaluer ce travail, et pour être venu(e)s, parfois de très loin, pour la soutenance de cette thèse. Au Maroc

Boyer, Edmond

351

Prsente pour obtenir le grade de DOCTEUR Spcialit : DISPOSITIFS DE L'ELECTRONIQUE INTEGREE  

E-Print Network [OSTI]

d'une collabora- tion entre l'Institut des Nanotechnologies de Lyon (INL), UMR CNRS 5512 de l- LETI). Je remercie Monsieur Guy Hollinger, en tant que directeur de l'INL, pour m'avoir donné l de l'équipe conception à l'INL et du laboratoire MEA au CEA-LETI, pour leur bonne humeur et leur

Paris-Sud XI, Université de

352

Un modle de commande pour le contrle des instabilits de combustion  

E-Print Network [OSTI]

Un modèle de commande pour le contrôle des instabilités de combustion Landau Ioan-Doré Bouziani pour l'instabilité de combustion. Ce système est analysé en utilisant la méthode de Krylov'analyse sont comparés avec des tests en simulation. Mots-clésmodélisation, instabilité de combustion, systèmes

Boyer, Edmond

353

Massive Gravity from Higher Derivative Gravity with Boundary Conditions  

E-Print Network [OSTI]

With an appropriate choice of parameters, a higher derivative theory of gravity can describe a normal massive sector and a ghost massless sector. We show that, when defined on an asymptotically de Sitter spacetime with Dirichlet boundary conditions, such a higher derivative gravity can provide a framework for a unitary theory of massive gravity in four spacetime dimensions. The resulting theory is free not only of higher derivative ghosts but also of the Boulware-Deser mode.

Minjoon Park; Lorenzo Sorbo

2012-10-29T23:59:59.000Z

354

The Early Evolution of Massive Stars: Radio Recombination Line Spectra  

E-Print Network [OSTI]

Velocity shifts and differential broadening of radio recombination lines are used to estimate the densities and velocities of the ionized gas in several hypercompact and ultracompact HII regions. These small HII regions are thought to be at their earliest evolutionary phase and associated with the youngest massive stars. The observations suggest that these HII regions are characterized by high densities, supersonic flows and steep density gradients, consistent with accretion and outflows that would be associated with the formation of massive stars.

Eric Keto; Qizhou Zhang; Stanley Kurtz

2007-11-15T23:59:59.000Z

355

Capture Formed Binaries via Encounters with Massive Protostars  

E-Print Network [OSTI]

Most massive stars are found in the center of dense clusters, and have a companion fraction much higher than their lower mass siblings; the massive stars of the Trapezium core in Orion have ~ 1.5 companions each. This high multiplicity could be a consequence of formation via a capture scenario, or it could be due to fragmentation of the cores that form the massive stars. During stellar formation circumstellar disks appear to be nearly ubiquitous. Their large radii compared to stellar sizes increase the interaction radius significantly, suggesting that disk interactions with neighboring stars could assist in capturing binary companions. This mechanism has been studied for stars of approximately solar mass and found to be inefficient. In this paper we present simulations of interactions between a 22 Msun star-disk system and less massive impactors, to study the disk-assisted capture formation of binaries in a regime suited to massive stars. The formation of binaries by capture is found to be much more efficient for massive capturers. We discuss the effects of a mass dependent velocity dispersion and mass segregation on the capture rates, and consider the long term survival of the resultant binaries in a dense cluster.

Nickolas Moeckel; John Bally

2006-10-20T23:59:59.000Z

356

Use of waste gypsum to replace natural gypsum as set retarders in portland cement  

SciTech Connect (OSTI)

The present study is focused on clarifying the influence of waste gypsum (WG) in replacing natural gypsum (NG) in the production of ordinary Portland cement (OPC). WG taken from slip casting moulds in a ceramic factory was formed from the hydration of plaster of paris. Clinker and 3-5 wt% of WG was ground in a laboratory ball mill to produce cement waste gypsum (CMWG). The same procedure was repeated with NG to substitute WG to prepare cement natural gypsum (CMNG). The properties of NG and WG were investigated via X-ray Diffraction (XRD), X-ray fluorescence (XRF) and differential scanning calorimetry (DSC)/thermogravimetric (TG) to evaluate the properties of CMNG and CMWG. The mechanical properties of cement were tested in terms of setting time, flexural and compressive strength. The XRD result of NG revealed the presence of dihydrate while WG contained dihydrate and hemihydrate. The content of dihydrate and hemihydrates were obtained via DSC/TG, and the results showed that WG and NG contained 12.45% and 1.61% of hemihydrate, respectively. Furthermore, CMWG was found to set faster than CMNG, an average of 15.29% and 13.67% faster for the initial and final setting times, respectively. This was due to the presence of hemihydrate in WG. However, the values obtained for flexural and compressive strength were relatively the same for CMNG and CMWG. Therefore, this result provides evidence that WG can be used as an alternative material to NG in the production of OPC.

Chandara, Chea; Azizli, Khairun Azizi Mohd [School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang (Malaysia); Ahmad, Zainal Arifin [School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang (Malaysia)], E-mail: zainal@eng.usm.my; Sakai, Etsuo [Tokyo Institute of Technology, Graduate School of Science and Engineering, Department of Metallurgy and Ceramic Science, 2-12-1 Meguro-ku, Ookayama, Meguro-ku, Tokyo 152-8552 (Japan)

2009-05-15T23:59:59.000Z

357

A THERMODYNAMICS STUDY ON THE UTILIZATION OF JORDANIAN OIL SHALE IN CEMENT INDUSTRY  

E-Print Network [OSTI]

Oil shale can be utilized in manufacturing the Portland cement. In addition to the utilization of the spent oil shale after combustion, it can also reduce the required temperature for the clinkering reactions. A study on the Jordanian oil shale was performed to maximize the use of oil shale in the

Awni Y. Al-otoom

358

Corrosion of Aluminium in Composite Cements Anthony Setiadi* and Neil B. Milestone  

E-Print Network [OSTI]

Corrosion of Aluminium in Composite Cements Anthony Setiadi* and Neil B. Milestone Immobilisation they are economic, durable and have long-term stability. However, there may be issues regarding the corrosion it is exposed to air, an oxide layer is formed. This layer generally provides protection to further corrosion

Sheffield, University of

359

Cement-based biocide coatings for controlling algal growth in water distribution canals  

E-Print Network [OSTI]

to potable or waste water. There is however a lack of understanding in the correlation between the natureCement-based biocide coatings for controlling algal growth in water distribution canals A. Alum Foundation, Water Quality Center, Arizona State University, Tempe, AZ, United States a r t i c l e i n f o

Mobasher, Barzin

360

CSER 96-027: storage of cemented plutonium residue containers in 55 gallon drums  

SciTech Connect (OSTI)

A nuclear criticality safety analysis has been performed for the storage of residual plutonium cementation containers, produced at the Plutonium Finishing Plant, in 55 gallon drums. This CSER increases the limit of total plutonium stored in each 55 gallon drum from 100 to 200 grams.

Watson, W.T.

1997-01-20T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Pore water evolution in oilfield sandstones: constraints from oxygen isotope microanalyses of quartz cement  

E-Print Network [OSTI]

of quartz cement Ann M.E. Marchanda,*, Calum I. Macaulayb , R. Stuart Haszeldinea , Anthony E. Fallickc--direct measurements were not possible) precipitated in the sandstones at temperatures jC; (2) the second zone B in the sandstones most likely between 70 and 90 jC; (3) the third zone C (homogeneous CL pattern and directly

Haszeldine, Stuart

362

Electromagnetic interference shielding reaching 70 dB in steel fiber cement  

E-Print Network [OSTI]

Electromagnetic interference shielding reaching 70 dB in steel fiber cement Sihai Wen, D.D.L. Chung; Silica fume; Shielding 1. Introduction Electromagnetic interference (EMI) shielding [1­4] is in critical, NY 14260-4400, USA Received 9 January 2002; accepted 14 August 2003 Abstract An electromagnetic

Chung, Deborah D.L.

363

Effects of oil charge on illite dates and stopping quartz cement: calibration of basin models  

E-Print Network [OSTI]

Abstract Effects of oil charge on illite dates and stopping quartz cement: calibration of basin Oil can fill pores in reservoir sandstones at any burial depth by long or short distance migration. There has been a debate since 1920 concerning the effect of oil charge. We have made detailed local

Haszeldine, Stuart

364

CAPACITY INVESTMENT UNDER DEMAND UNCERTAINTY: THE ROLE OF IMPORTS IN THE U.S. CEMENT INDUSTRY  

E-Print Network [OSTI]

varies across markets. In the presence of uncertain demand, capacity choices are shown theoreticallyCAPACITY INVESTMENT UNDER DEMAND UNCERTAINTY: THE ROLE OF IMPORTS IN THE U.S. CEMENT INDUSTRY Guy://www.economie.polytechnique.edu/ mailto:chantal.poujouly@polytechnique.edu #12;Capacity Investment under Demand Uncertainty: The Role

Paris-Sud XI, Université de

365

Proceedings of the 12 International Congress on the Chemistry of Cement  

E-Print Network [OSTI]

in water or as a granular water-filled porous media. In the former case, significant settling, and Evaporative Water Loss during Early Age Curing/Drying Immediately after placement, gravitational forces and the local drying environment begin to influence the (micro)structure of a cement paste, mortar, or concrete

Bentz, Dale P.

366

Development of a performance-based industrial energy efficiency indicator for cement manufacturing plants.  

SciTech Connect (OSTI)

Organizations that implement strategic energy management programs have the potential to achieve sustained energy savings if the programs are carried out properly. A key opportunity for achieving energy savings that plant managers can take is to determine an appropriate level of energy performance by comparing the plant performance with that of similar plants in the same industry. Manufacturing plants can set energy efficiency targets by using performance-based indicators. The U.S. Environmental Protection Agency (EPA), through its ENERGY STAR{reg_sign} program, has been developing plant energy performance indicators (EPIs) to encourage a variety of U.S. industries to use energy more efficiently. This report describes work with the cement manufacturing industry to provide a plant-level indicator of energy efficiency for assembly plants that produce a variety of products, including Portland cement and other specialty cement products, in the United States. Consideration is given to the role that performance-based indicators play in motivating change; the steps needed to develop indicators, including interacting with an industry to secure adequate data for an indicator; and the actual application and use of an indicator when complete. How indicators are employed in the EPA's efforts to encourage industries to voluntarily improve their use of energy is discussed as well. The report describes the data and statistical methods used to construct the EPI for cement manufacturing plants. Individual equations are presented, as are the instructions for using them in an associated Excel spreadsheet.

Boyd, G.; Decision and Information Sciences

2006-07-21T23:59:59.000Z

367

The interfacial chemistry of solidification/stabilization of metals in cement and pozzolanic material systems  

SciTech Connect (OSTI)

The chemistry of cement, its hydration and mechanisms of solidification/stabilization (s/s) of toxic metals by cement-based systems and pozzolanic materials are significantly controlled by surface, near-surface and interfacial phenomena. The adsorption conditions and the selectivity strong affinity of hazardous metals towards clay minerals, certain hydrated metal oxides and oxyhydroxides, and cementitous substances also play an important role in the s/s process for the immobilization of contaminants. Recent works from the authors` laboratory involving metal ions and superplasticizers have elucidated the mechanisms of reactions leading to the retardation of cement hydration and subsequent setting and their interactions with silicate-based systems. This article delineates the current status of interfacial chemistry at the solid-liquid boundary and places it in perspective with present and future s/s processes based on Portland cement and pozzolanic materials. The importance of surface charge, the role of interfacial phenomena on adsorption, and the importance of calcium and other types of anions and cations in s/s are also discussed. A surface charge control reaction model that accounts for the importance of calcium and other cations and anions is outlined and used to discuss the chemical nature and microstructure of the interfacial transition zone.

Yousuf, M.; Mollah, A.; Vempati, R.K.; Lin, T.C.; Cocke, D.L. [Lamar Univ., Beaumont, TX (United States)] [Lamar Univ., Beaumont, TX (United States)

1995-11-01T23:59:59.000Z

368

Improved microstructure of cement-based composites through the addition of rock wool particles  

SciTech Connect (OSTI)

Rock wool is an inorganic fibrous substance produced by steam blasting and cooling molten glass. As with other industrial by-products, rock wool particles can be used as cementitious materials or ultra fine fillers in cement-based composites. This study investigated the microstructure of mortar specimens produced with cement-based composites that include various forms of rock wool particles. It conducted compressive strength testing, rapid chloride penetration tests, X-ray diffraction analysis, thermo-gravimetric analysis, and scanning electronic microscopy to evaluate the macro- and micro-properties of the cement-based composites. Test results indicate that inclusion of rock wool particles in composites improved compressive strength and reduced chloride ion penetration at the age of 91 days due to the reduction of calcium hydroxide content. Microscopic analysis confirms that the use of rock wool particles contributed to the formation of a denser, more compact microstructure within the hardened paste. In addition, X-ray diffraction analysis shows few changes in formation of pozzolanic reaction products and no new hydrations are formed with incorporating rock wool particles. - Highlights: • We report the microstructural characterization of cement-based composites. • Different mixes produced with various rock wool particles have been tested. • The influence of different mixes on macro and micro properties has been discussed. • The macro properties are included compressive strength and permeability. • XRD and SEM observations confirm the pozzolanic reaction in the resulting pastes.

Lin, Wei-Ting [Dept. of Civil Engineering, National Ilan University, Ilan 26047, Taiwan (China); Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan 32546, Taiwan (China); Cheng, An, E-mail: ancheng@niu.edu.tw [Dept. of Civil Engineering, National Ilan University, Ilan 26047, Taiwan (China); Huang, Ran; Zou, Si-Yu [Dept. of Harbor and River Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan (China)

2013-10-15T23:59:59.000Z

369

Mechanical properties of WC10Co cemented carbides sintered from nanocrystalline spray conversion processed powders  

E-Print Network [OSTI]

Mechanical properties of WC±10Co cemented carbides sintered from nanocrystalline spray conversion as the spray conversion process [2]. The WC particle sizes in powders fabricated by the spray conversion: microstructural parameters such as WC grain size, Co mean free path and WC/WC contiguity; chemical factors

Hong, Soon Hyung

370

Characterizations of WC-10Co nanocomposite powders and subsequently sinterhip sintered cemented carbide  

SciTech Connect (OSTI)

Ultrafine WC-Co cemented carbides, combining high hardness and high toughness, are expected to find broad applications. In this study, WC-10Co-0.4VC-0.4Cr{sub 3}C{sub 2} (wt.%) nanocomposite powders, whose average grain size was about 30 nm, were fabricated by spray pyrolysis-continuous reduction and carbonization technology. The as-prepared nanocomposite powders were characterized and analyzed by chemical methods, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET analysis and atomic force microscopy (AFM). Furthermore, 'sinterhip' was used in the sintering process, by which ultrafine WC-10Co cemented carbides with an average grain size of 240 nm were prepared. The material exhibited high Rockwell A hardness of HRA 92.8, Vickers hardness HV{sub 1} 1918, and transverse rapture strength (TRS) of 3780 MPa. The homogeneously dispersed grain growth inhibitors such as VC, Cr{sub 3}C{sub 2} in nanocomposite powder and the special nonmetal-metal nanocomposite structure of WC-10Co nanocomposite powder played very important roles in obtaining ultrafine WC-10Co cemented carbide with the desired properties and microstructure. There was an abundance of triple junctions in the ultrafine WC-10Co cemented carbide; these triple junctions endowed the sintered specimen with high mechanical properties.

Shi, X.L. [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122Luoshi Road, Wuhan 430070 (China)]. E-mail: sxl071932@126.com; Shao, G.Q. [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122Luoshi Road, Wuhan 430070 (China); Duan, X.L. [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122Luoshi Road, Wuhan 430070 (China); Xiong, Z. [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122Luoshi Road, Wuhan 430070 (China); Yang, H. [State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122Luoshi Road, Wuhan 430070 (China)

2006-12-15T23:59:59.000Z

371

Recycle of Wastes of Clay Brick Industry for Producing Eco-cement  

E-Print Network [OSTI]

mixes were designed from the WCB and ordinary Portland cement (OPC). After adding the required amount of water for each mix, the pastes were moulded in 5x5x5cm3 mould. The initial and final setting time were measured. The moulded specimens were cured...

Amin, A. M

2010-01-01T23:59:59.000Z

372

Identification and characterization of agent for reductive dechlorination in mixtures of ferrous iron and Portland cement  

E-Print Network [OSTI]

were conducted to identify a potential active agent in a mixture of Fe(II) and Portland cement extract (PCX). Results of XRD analysis indicated that a potential active agent is likely to be green rust chloride, which is a layered Fe...

Ko, Sae Bom

2001-01-01T23:59:59.000Z

373

Encapsulation of mixed radioactive and hazardous waste contaminated incinerator ash in modified sulfur cement  

SciTech Connect (OSTI)

Some of the process waste streams incinerated at various Department of Energy (DOE) facilities contain traces of both low-level radioactive (LLW) and hazardous constituents, thus yielding ash residues that are classified as mixed waste. Work is currently being performed at Brookhaven National Laboratory (BNL) to develop new and innovative materials for encapsulation of DOE mixed wastes including incinerator ash. One such material under investigation is modified sulfur cement, a thermoplastic developed by the US Bureau of Mines. Monolithic waste forms containing as much as 55 wt % incinerator fly ash from Idaho national Engineering Laboratory (INEL) have been formulated with modified sulfur cement, whereas maximum waste loading for this waste in hydraulic cement is 16 wt %. Compressive strength of these waste forms exceeded 27.6 MPa. Wet chemical and solid phase waste characterization analyses performed on this fly ash revealed high concentrations of soluble metal salts including Pb and Cd, identified by the Environmental Protection Agency (EPA) as toxic metals. Leach testing of the ash according to the EPA Toxicity Characteristic Leaching Procedure (TCLP) resulted in concentrations of Pb and Cd above allowable limits. Encapsulation of INEL fly ash in modified sulfur cement with a small quantity of sodium sulfide added to enhance retention of soluble metal salts reduced TCLP leachate concentrations of Pb and Cd well below EPA concentration criteria for delisting as a toxic hazardous waste. 12 refs., 4 figs., 2 tabs.

Kalb, P.D.; Heiser, J.H. III; Colombo, P.

1990-01-01T23:59:59.000Z

374

Influence of hydroxypropylguars on rheological behaviour of cement-based mortars  

E-Print Network [OSTI]

behavior of cementitious materials [7]. Concrete, mortar and cement grout with high fluidity (e.g. self-compacting concrete or self- leveling underlayment) have been developed in order to facilitate placement. However and Concrete Research 58 (2014) 161-168" DOI : 10.1016/j.cemconres.2014.01.020 #12;2 ABSTRACT

Boyer, Edmond

375

[ ]May 2014 Portland cement concrete (PCC) overlays have been used with great success in many locations  

E-Print Network [OSTI]

accelerated pavement testing on bonded concrete overlay pavements to be constructed at the Pavement Research testing; evaluate the structural bearing capacity of the concrete overlay pavement structures[ ]May 2014 PROBLEM Portland cement concrete (PCC) overlays have been used with great success

Harms, Kyle E.

376

Concrete international /january 2010 35 Portland limestone cement (PLC) is produced by  

E-Print Network [OSTI]

Concrete international /january 2010 35 Portland limestone cement (PLC) is produced by blending demonstration of PLC concrete in the late-fall construction of a parking lot at a ready mixed concrete plant near Gatineau, QC, Canada. The performance of the plastic and hardened concretes produced with PLC

377

Recovery Act Production of Algal BioCrude Oil from Cement Plant Carbon Dioxide  

SciTech Connect (OSTI)

The consortium, led by Sunrise Ridge Algae Inc, completed financial, legal, siting, engineering and environmental permitting preparations for a proposed demonstration project that would capture stack gas from an operating cement plant and convert the carbon dioxide to beneficial use as a liquid crude petroleum substitute and a coal substitute, using algae grown in a closed system, then harvested and converted using catalyzed pyrolysis.

Robert Weber; Norman Whitton

2010-09-30T23:59:59.000Z

378

Emerging Energy-efficiency and CO{sub 2} Emission-reduction Technologies for Cement and Concrete Production  

SciTech Connect (OSTI)

Globally, the cement industry accounts for approximately 5 percent of current anthropogenic carbon dioxide (CO{sub 2}) emissions. World cement demand and production are increasing significantly, leading to an increase in this industry's absolute energy use and CO{sub 2} emissions. Development of new energy-efficiency and CO{sub 2} emission-reduction technologies and their deployment in the market will be key for the cement industry's mid- and long-term climate change mitigation strategies. This report is an initial effort to compile available information on process description, energy savings, environmental and other benefits, costs, commercialization status, and references for emerging technologies to reduce the cement industry's energy use and CO{sub 2} emissions. Although studies from around the world identify a variety of sector-specific and cross-cutting energy-efficiency technologies for the cement industry that have already been commercialized, information is scarce and/or scattered regarding emerging or advanced energy-efficiency and low-carbon technologies that are not yet commercialized. This report consolidates available information on nineteen emerging technologies for the cement industry, with the goal of providing engineers, researchers, investors, cement companies, policy makers, and other interested parties with easy access to a well-structured database of information on these technologies.

Hasanbeigi, Ali; Price, Lynn; Lin, Elina

2012-04-06T23:59:59.000Z

379

MESURE DE 11 POUR L'URANIUM-235 AVEC DES NEUTRONS C 1 -157 leve pour donner lieu une forte conversion interne. SIGNARBIEUX(C.), RIBRAG(M.), NIFENECKER(H.)  

E-Print Network [OSTI]

MESURE DE 11 POUR L'URANIUM-235 AVEC DES NEUTRONS C 1 - 157 élevée pour donner lieu à une forte conversion interne. SIGNARBIEUX(C.), RIBRAG(M.), NIFENECKER(H.) Seule une étude plus approfondie des(K.), North Holland thermique de 235U. Publishing Company, Vol. 2, p. 1533, 1965. MESURE DE 5 POUR L'URANIUM

Paris-Sud XI, Université de

380

Brownfield reuse of dredged New York Harbor sediment by cement-based solidification/stabilization  

SciTech Connect (OSTI)

Newly effective federal regulations restrict the ocean disposal of sediments dredged from the harbors of New York and Newark. The New York Port Authority is faced with a critical situation: find land-based disposal/uses for 10`s of millions cubic yards of sediments or lose standing as a commercial port for ocean-going ships. One of the technologies now being employed to manage the sediments is portland cement-based solidification/stabilization (S/S) treatment. At least 4 million cubic yards of the sediments will undergo cement-based S/S treatment. This treatment will immobilize heavy metals, dioxin, PCBs and other organic contaminants in the sediment. The treatment changes the sediment from a environmental liability into a valuable structural fill. This structural fill is being used at two properties. The first property is an old municipal landfill in Port Newark, New Jersey. The treated sediments are being used as structural fill to cover about 20 acres of the landfill. This will allow planned redevelopment of the landfill property into a shopping mall. The second property called the Seaboard site, was the location of a coal gasification facility and later a wood preservation facility. This 160-acre property has been designated for brownfield redevelopment. Over 4 million cubic yards of treated sediments will eventually cover this site. Portland cement is the selected S/S binding reagent. Nearly 500,000 tons of cement will eventually be used to treat the sediments. Cement was selected for its ability to (a) change the peanut butter-like consistency of the sediments into a structural material and (b) to physically and chemically immobilize hazardous constituents in the sediment.

Loest, K. [ECDC Environmental L.C., Pembroke, MA (United States). Eastern Operations; Wilk, C.M. [Portland Cement Association, Skokie, IL (United States)

1998-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Probing Water Phases in Cement Blends using 1 Magnetic Resonance Relaxometry  

E-Print Network [OSTI]

the corrosion. In the long term, the volume increase due to the formation of corrosion products creates ratio (w:s). Pastes were poured into 1 cm OD diameter glass test tubes, vibrated to remove entrapped air their relative content. Relative content of chemically bound water was estimated by subtracting the CPMG

Sheffield, University of

382

tude des stratgies d'exploration d'un environnement inconnu pour l'apprentissage de cartes cognitives et pour la navigation  

E-Print Network [OSTI]

it was assumed that the exploration followed a random process, more recent studies have observed recurrent�tude des stratégies d'exploration d'un environnement inconnu pour l'apprentissage de cartes Exploration Strategies in unknown environments, learning cognitive maps for spatial navigation. Master Thesis

Arleo, Angelo

383

The Assembly History of Massive Galaxies: What Do We Know?  

E-Print Network [OSTI]

Understanding the formation history of massive galaxies is one of most popular and longstanding problems in astronomy, with observations and theory addressing how and when these systems assembled. Since the most massive galaxies in today's universe, with M_*> 10^11 M_0, are nearly all elliptical with uniform old stellar populations, we must probe higher redshifts to discover their full origins. A recent consensus has developed that nearly all M_* > 10^11 M_0 galaxies we see today were established by z~1, with at most a factor of two growth in stellar mass and number densities at lower redshifts. We review the evidence for this, and discuss how recent observations of star formation rates, colors, and morphologies of massive galaxies at z 10^11 M_0 show that these systems are still experiencing some evolution. Massive galaxies undergo on average a single major merger at z 10^11.5 M_0, appear in similar abundance at z 1.5 demonstrate that major galaxy mergers are the primary method for assembling these massive galaxies, with nearly all of this merging occurring at z > 2, with on average 4 to 5 major mergers taking place at z = 1.5 - 3.

Christopher J. Conselice

2007-06-23T23:59:59.000Z

384

Carbon nanotube and nanofiber reinforcement for improving the flexural strength and fracture toughness of portland cement paste  

E-Print Network [OSTI]

The focus of the proposed research will be on exploring the use of nanotechnology-based nano-filaments, such as carbon nanotubes (CNTs) and nanofibers (CNFs), as reinforcement in improving the mechanical properties of portland cement paste as a...

Tyson, Bryan Michael

2012-07-16T23:59:59.000Z

385

Star Formation and Merging in Massive Galaxies at z < 2  

E-Print Network [OSTI]

Observing massive galaxies at various redshifts is one of the most straightforward and direct approaches towards understanding galaxy formation. There is now largely a consensus that the massive galaxy (M_* > 10^11 M_0) population is fully formed by z~1, based on mass and luminosity functions. However, we argue that the latest data can only rule out number and mass density evolution of a factor of > 2-3 at z 10^11 M_0 galaxies reveals that 40+/-5% of galaxies with M_* > 10^11 M_0 at z~1 are undergoing star formation that effectively doubles their stellar mass between z = 0.4 - 1.4. These massive galaxies also undergo 0.9^+0.7_-0.5 major mergers during this same time period.

Christopher J. Conselice

2008-06-14T23:59:59.000Z

386

Massive Stars in Colliding Wind Systems: the GLAST Perspective  

SciTech Connect (OSTI)

Colliding winds of massive stars in binary systems are considered as candidate sites of high-energy non-thermal photon emission. They are already among the suggested counterparts for a few individual unidentified EGRET sources, but may constitute a detectable source population for the GLAST observatory. The present work investigates such population study of massive colliding wind systems at high-energy gamma-rays. Based on the recent detailed model (Reimer et al. 2006) for non-thermal photon production in prime candidate systems, we unveil the expected characteristics of this source class in the observables accessible at LAT energies. Combining the broadband emission model with the presently cataloged distribution of such systems and their individual parameters allows us to conclude on the expected maximum number of LAT-detections among massive stars in colliding wind binary systems.

Reimer, Anita; Reimer, Olaf; /Stanford U., HEPL /KIPAC, Menlo Park

2011-11-29T23:59:59.000Z

387

Massive Black Hole Science with eLISA  

E-Print Network [OSTI]

The evolving Laser Interferometer Space Antenna (eLISA) will revolutionize our understanding of the formation and evolution of massive black holes along cosmic history by probing massive black hole binaries in the $10^3-10^7$ solar mass range out to redshift $z\\gtrsim 10$. High signal-to-noise ratio detections of $\\sim 10-100$ binary coalescences per year will allow accurate measurements of the parameters of individual binaries (such as their masses, spins and luminosity distance), and a deep understanding of the underlying cosmic massive black hole parent population. This wealth of unprecedented information can lead to breakthroughs in many areas of physics, including astrophysics, cosmology and fundamental physics. We review the current status of the field, recent progress and future challenges.

Enrico Barausse; Jillian Bellovary; Emanuele Berti; Kelly Holley-Bockelmann; Brian Farris; Bangalore Sathyaprakash; Alberto Sesana

2015-01-09T23:59:59.000Z

388

Assessing the effect of cement-steel interface on well casing corrosion in aqueous CO2 environments  

SciTech Connect (OSTI)

CO{sub 2} leakage is a critical safety concern for geologic storage. In wellbore environments, important leakage paths include the rock-cement and cement-casing interfaces. If the cement-casing interface is filled with escaping CO{sub 2}, the well casing directly contacts the CO{sub 2}. This can cause severe corrosion in the presence of water. This paper studies the effect of steel-cement interface gaps, ranging from 1 mm to 0 um, on casing corrosion. Corrosion kinetics were measured employing electrochemical techniques including linear polarization resistance, open circuit potential and electrochemical impedance spectroscopy. The experimental results showed that the corrosion of steel is not significant where the gap between steel and cement is small ({le} 100 {micro}m). Corrosion rates are controlled by the diffusion of corrosive species (H{sub 2}CO{sub 3} and H{sup +}) along the interface. In contrast, steel corrosion is severe in a broad gap where the corrosion process is limited only by the reaction kinetics of steel and corrosive species. The threshold leading to severe corrosion in terms of the cement-steel interface size (100 {micro}m) was determined. Our research clarifies a corrosion scenario at the cement-steel interface. Casing steel corrosion is initiated when attacked by corrosive species at the cement-steel interface. For relatively tight interfaces, this results in a slow thinning of the casing and expansion of the interface width. If the gap increases beyond the critical threshold size, the corrosion rate increases significantly, and a potentially damaging cycle of corrosion and interface expansion is developed.

Han, Jiabin [Los Alamos National Laboratory; Carey, James W [Los Alamos National Laboratory; Zhang, Jinsuo [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

389

THE PAIR FRACTION OF MASSIVE GALAXIES AT 0 {<=} z {<=} 3  

SciTech Connect (OSTI)

Using a mass-selected (M{sub *} {>=} 10{sup 11} M{sub Sun }) sample of 198 galaxies at 0 {<=} z {<=} 3.0 with Hubble Space Telescope/NICMOS H{sub 160}-band images from the COSMOS survey, we find evidence for the evolution of the pair fraction above z {approx} 2, an epoch in which massive galaxies are believed to undergo significant structural and mass evolution. We observe that the pair fraction of massive galaxies is 0.15 {+-} 0.08 at 1.7 {<=}z {<=} 3.0, where galaxy pairs are defined as massive galaxies having a companion of flux ratio from 1:1 to 1:4 within a projected separation of 30 kpc. This is slightly lower but still consistent with the pair fraction measured previously in other studies, and the merger fraction predicted in halo-occupation modeling. The redshift evolution of the pair fraction is described by a power law F(z) = (0.07 {+-} 0.04) Multiplication-Sign (1 + z){sup 0.6{+-}0.5}. The merger rate is consistent with no redshift evolution; however it is difficult to constrain due to the limited sample size and the high uncertainties in the merging timescale. Based on the merger rate calculation, we estimate that a massive galaxy undergoes on average 1.1 {+-} 0.5 major mergers from z = 3 to 0. The observed merger fraction is sufficient to explain the number density evolution of massive galaxies, but insufficient to explain the size evolution. This is a hint that mechanism(s) other than major merging may be required to increase the sizes of the massive, compact quiescent galaxies from z {approx} 2 to 0.

Man, Allison W. S.; Toft, Sune; Zirm, Andrew W. [Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen (Denmark); Wuyts, Stijn [Max-Planck-Institut fuer Extraterrestrische Physik, Garching bei Muenchen (Germany); Van der Wel, Arjen, E-mail: allison@dark-cosmology.dk, E-mail: sune@dark-cosmology.dk, E-mail: azirm@dark-cosmology.dk, E-mail: swuyts@mpe.mpg.de, E-mail: vdwel@mpia.de [Max-Planck-Institut fuer Astronomie, Heidelberg (Germany)

2012-01-10T23:59:59.000Z

390

The winds of the hot massive first stars  

E-Print Network [OSTI]

We study dynamical aspects of circumstellar environment around massive zero-metallicity first stars. For this purpose we apply our NLTE wind models. We show that the hydrogen-helium stellar wind from stationary massive first generation (Population III) stars (driven either by the line (bound-bound) or continuum (bound-free and free-free) transitions) is unlikely. The possibility of expulsion of chemically homogeneous wind and the role of minor isotopes are also discussed. Finally, we estimate the importance of hydrogen and helium lines for shutting off the initial accretion onto first stars and its influence on initial mass function of first stars.

J. Krticka; J. Kubat

2005-09-07T23:59:59.000Z

391

Energy momentum flows for the massive vector field  

E-Print Network [OSTI]

We present a causal trajectory interpretation for the massive vector field, based on the flows of rest energy and a conserved density defined using the time-like eigenvectors and eigenvalues of the stress-energy-momentum tensor. This work extends our previous work which used a similar procedure for the scalar field. The massive, spin-one, complex vector field is discussed in detail and solutions are classified using the Pauli-Lubanski spin vector. The flows of energy-momentum are illustrated in a simple example of standing waves in a plane.

George Horton; Chris Dewdney

2006-09-26T23:59:59.000Z

392

On Solutions of Minimal Massive 3D Gravity  

E-Print Network [OSTI]

We look at solutions of Minimal Massive Gravity (MMG), a generalisation of Topologically Massive Gravity (TMG) that improves upon its holographic properties. It is shown that generically (in MMG parameter space) all conformally flat solutions of vacuum MMG are locally isometric to one of the two (A)dS vacua of the theory. We then couple a scalar field, and find that domain wall solutions can only interpolate between these two vacua precisely when the bulk graviton is tachyonic. Finally, we find a non-BTZ AdS black hole solution satisfying Brown-Henneaux boundary conditions, which lies within the "bulk/ boundary unitarity region".

Arvanitakis, Alex S

2015-01-01T23:59:59.000Z

393

Particle-Antiparticle Metamorphosis of Massive Majorana Neutrinos and Gauginos  

E-Print Network [OSTI]

Recent results on neutrinoless double beta decay, as reported by Klapdor-Kleingrothaus et al., take us for the first time into the realm of Majorana spacetime structure. However, this structure has either been treated as an afterthought to the Dirac construct; or, when it has been attended to in its own right, its physical and mathematical content was never fully unearthed. In this Letter,we undertake to remedy the existing situation. We present a detailed formalism required for the description of the non-trivial spacetime structure underlying the "nu-nubar" metamorphosis - where "nu" generically represents a massive Majorana neutrino, or a massive gaugino.

D. V. Ahluwalia-Khalilova

2003-06-13T23:59:59.000Z

394

One-loop divergences in massive gravity theory  

E-Print Network [OSTI]

The one-loop divergences are calculated for the recently proposed ghost-free version of massive gravity, where the action depends on both metric and external tensor field f. The non-polynomial structure of the massive term is reduced to a more standard form by means of auxiliary tensor field, which is settled on-shell after quantum calculations are performed. As one should expect, the counterterms do not reproduce the form of the classical action. Moreover, the result has the form of the power series in f.

Ioseph L. Buchbinder; Dante D. Pereira; Ilya L. Shapiro

2012-01-16T23:59:59.000Z

395

A literature review of mixed waste components: Sensitivities and effects upon solidification/stabilization in cement-based matrices  

SciTech Connect (OSTI)

The US DOE Oak Ridge Field Office has signed a Federal Facility Compliance Agreement (FFCA) regarding Oak Ridge Reservation (ORR) mixed wastes subject to the land disposal restriction (LDR) provisions of the Resource conservation and Recovery Act. The LDR FFCA establishes an aggressive schedule for conducting treatability studies and developing treatment methods for those ORR mixed (radioactive and hazardous) wastes listed in Appendix B to the Agreement. A development, demonstration, testing, and evaluation program has been initiated to provide those efforts necessary to identify treatment methods for all of the wastes that meet Appendix B criteria. The program has assembled project teams to address treatment development needs in a variety of areas, including that of final waste forms (i.e., stabilization/solidification processes). A literature research has been performed, with the objective of determining waste characterization needs to support cement-based waste-form development. The goal was to determine which waste species are problematic in terms of consistent production of an acceptable cement-based waste form and at what concentrations these species become intolerable. The report discusses the following: hydration mechanisms of Portland cement; mechanisms of retardation and acceleration of cement set-factors affecting the durability of waste forms; regulatory limits as they apply to mixed wastes; review of inorganic species that interfere with the development of cement-based waste forms; review of radioactive species that can be immobilized in cement-based waste forms; and review of organic species that may interfere with various waste-form properties.

Mattus, C.H.; Gilliam, T.M.

1994-03-01T23:59:59.000Z

396

A. DVORAK : Quintette pour piano et cordes en la majeur, op.81 Allegro ma non troppo -Andante con moto -Molto vivace -Allegro  

E-Print Network [OSTI]

A. DVORAK : Quintette pour piano et cordes en la majeur, op.81 Allegro ma non troppo - Andante con moto - Molto vivace - Allegro En juillet 1887, Dvorak reprend l'ancienne partition d'un quintette pour

Mazliak, Laurent

397

Engineering properties of miniature cement - fly ash compacts prepared by high pressure compaction  

E-Print Network [OSTI]

ENGINEERING PROPERTIES OF MINIATURE CEMENT - FLY ASH COMPACTS PREPARED BY HIGH PRESSURE COMPACTION E NGIRPR OT SFMMAFU AEU C-ALEYY HDOBPvvIi va vGI ge(iD(vI oannItI au NId(R E)L xrP1IeRPvT 9(evP(n uDnuPnnBIrv au vGI eI0DPeIBIrvR uae vGI i...IteII au LEHNFA -M Ho2FYoF EDtDRv 3456 L(7ae HDO7I8v? oP1Pn FrtPrIIePrt ENGINEERING PROPERTIES OF MINIATURE CEMENT - FLY ASH COMPACTS PREPARED BY HIGH PRESSURE COMPACTION E NGIRPR OT SFMMAFU AEU C-ALEYY E99ea1Ii (R va RvTnI (ri 8arvIrv OT? LP...

Bormann, Jeffrey Ray

1985-01-01T23:59:59.000Z

398

Plant-Wide Energy Efficiency Assessment at the Arizona Portland Cement Plant in Rillito, Arizona  

SciTech Connect (OSTI)

A Department of Energy Plant-wide Assessment was undertaken by Arizona Portland Cement (APC) beginning in May 2005. The assessment was performed at APC’s cement production facility in Rillito, Arizona. The assessment included a compressed air evaluation along with a detailed process audit of plant operations and equipment. The purpose of this Energy Survey was to identify a series of energy cost savings opportunities at the Plant, and provide preliminary cost and savings estimates for the work. The assessment was successful in identifying projects that could provide annual savings of over $2.7 million at an estimated capital cost of $4.3 million. If implemented, these projects could amount to a savings of over 4.9 million kWh/yr and 384,420 MMBtu/year.

Stephen J. Coppinger, P.E.; Bruce Colburn, Ph.D., P.E., CEM

2007-05-17T23:59:59.000Z

399

Evaluation of Gel Permeation Chromatography as an analytical tool for aspect cement testing  

E-Print Network [OSTI]

V ? ANALYSIS OF TEST RESULTS Introduction Hot Mixed Asphaltic Concrete Binder Aging Versus GPC . Identification by GPC . GPC and Chemical Analysis CHAPTER VI ? CONCLUSIONS AND RECOMMENDATIONS Conclusions Recommendations ~Pa e iv vii ix 7...EVALUATION OF GEL PERMEATION CHROMATOGRAPHY AS AN ANALYTICAL TOOL FOR ASPHALT CEMENT TESTING A Thesis by RICHARD JOHN HOLMGREEN, JR. Submitted to the Graduate College of Texas A8, M University in partial fulfillment of the requirements...

Holmgreen, Richard J

1985-01-01T23:59:59.000Z

400

Research on drilling fluids and cement slurries at Standard Oil Production Company: an internship report  

E-Print Network [OSTI]

1986 Major Subject: Chemical Engineering Research on Drilling Fluids and Cement Slurries at Standard Oil Production Company An Internship Report by EUGENE CHARLES FLIPSE Dr. K. R. Hall Chairman, Advisory Committee Dr. A Juazis Internship... was assigned to the SOPC Drilling Fluids Laboratory during his internship. Dr. W. C. McMordie, Jr. was his direct supervisor. The technical and administrative duties of this internship fell into six categories: orientation, laboratory build-out, office...

Flipse, Eugene Charles, 1956-

2013-03-13T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

A study of immobilization of four heavy metals by solidification/stabilization with portland cement  

E-Print Network [OSTI]

A STUDY OF IMMOBILIZATION OF FOUR HEAUY METALS BY SOLIDIFICATION/STABILIZATION WITH PORTLAND CEMEhK A Thesis by SUSAN ANN TRUSSELL Submitted to Texas AdcM University in partial fulfillment of the requirements for the degree of MASTER... of Immobilization of Four Heavy Metals By Solidification/Stabilization with Portland Cement. (May 1994) Susan Trussell, B. S. , Baylor University; M. A. , Texas ARM University Chair of Advisory Committee: Dr. Bill Batchelor Immobilization of four heavy metals...

Trussell, Susan A

1994-01-01T23:59:59.000Z

402

Utilisation des DEL et photodiodes PIN pour la transmission haute qualit de signaux TV par fibre optique  

E-Print Network [OSTI]

95 Utilisation des DEL et photodiodes PIN pour la transmission haute qualité de signaux TV par diodes électroluminescentes et de photodiodes PIN pour la transmission TV en bande de base par fibres The use of LEDs and PIN photodiodes for optical TV base-band transmission requires special care to reduce

Boyer, Edmond

403

THESE DE DOCTORAT pour obtenir le titre de Docteur en Sciences de l'Universit de Nice-Sophia Antipolis  

E-Print Network [OSTI]

THESE DE DOCTORAT pour obtenir le titre de Docteur en Sciences de l'Université de Nice-Sophia Antipolis Ecole doctorale « Science et Technologie de l'Information et de la Communication » de Nice Sophia-Antipolis. Discipline Informatique UNIVERSITE DE NICE SOPHIA-ANTIPOLIS FACULTE DES SCIENCES JADAPT : UN MODELE POUR

Lahire, Philippe

404

Activits d'tude et de recherche (AER) pour dynamiser l'tude de la gomtrie dans l'espace  

E-Print Network [OSTI]

1 Activités d'étude et de recherche (AER) pour dynamiser l'étude de la géométrie dans l'espace en anthropologique. Sommaire Activités d'étude et de recherche (AER) pour dynamiser l'étude de la géométrie dans l

Sart, Remi

405

Deteriorated hardened cement paste structure analyzed by XPS and {sup 29}Si NMR techniques  

SciTech Connect (OSTI)

In this report, X-ray photoelectron spectroscopy (XPS) and {sup 29}Si-MAS-NMR was used for the evaluation of deteriorated hardened cement pastes. The deterioration by ammonium nitrate solution was accompanied by changes in the pore structure as well as by structural changes in the C–S–H in the hardened cement paste. The CaO/SiO{sub 2} ratio of the C–S–H decreased with the progress of deterioration, there was also polymerization of the silicate in the C–S–H. It was confirmed that the degree of polymerization of silicate of the C–S–H in hardened cement paste can be determined by XPS. It was also shown that the polymerization depends on the structure of the C–S–H. -- Highlights: •The polymerization of silicate of the C–S–H in the HCP can be observed by XPS. •The structure of C–S–H changed with the degree of calcium leaching. •The NMR result about silicate in C–S–H was in good agreement with the XPS result.

Kurumisawa, Kiyofumi, E-mail: kurumi@eng.hokudai.ac.jp [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan); Nawa, Toyoharu [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan)] [Faculty of Engineering, Hokkaido University, Japan, Kita 13, Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628 (Japan); Owada, Hitoshi [Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo (Japan)] [Radioactive Waste Management Funding and Research Center, 1-15-7 Tsukishima, Chuo-ku, Tokyo (Japan); Shibata, Masahito [Taiheiyo Consultant Co., Ltd., 2-4-2, Ohsaku, Sakura-City, Chiba (Japan)] [Taiheiyo Consultant Co., Ltd., 2-4-2, Ohsaku, Sakura-City, Chiba (Japan)

2013-10-15T23:59:59.000Z

406

Effect of Sodium Carboxymethyl Celluloses on Water-catalyzed Self-degradation of 200-degree C-heated Alkali-Activated Cement  

SciTech Connect (OSTI)

We investigated the usefulness of sodium carboxymethyl celluloses (CMC) in promoting self-degradation of 200°C-heated sodium silicate-activated slag/Class C fly ash cementitious material after contact with water. CMC emitted two major volatile compounds, CO2 and acetic acid, creating a porous structure in cement. CMC also reacted with NaOH from sodium silicate to form three water-insensitive solid reaction products, disodium glycolate salt, sodium glucosidic salt, and sodium bicarbonate. Other water-sensitive solid reaction products, such as sodium polysilicate and sodium carbonate, were derived from hydrolysates of sodium silicate. Dissolution of these products upon contact with water generated heat that promoted cement’s self-degradation. Thus, CMC of high molecular weight rendered two important features to the water-catalyzed self-degradation of heated cement: One was the high heat energy generated in exothermic reactions in cement; the other was the introduction of extensive porosity into cement.

Sugama T.; Pyatina, T.

2012-05-01T23:59:59.000Z

407

Delusional Boot: Securing Cloud Hypervisors without Massive Re-engineering  

E-Print Network [OSTI]

Delusional Boot: Securing Cloud Hypervisors without Massive Re-engineering Anh Nguyen , Himanshu an obstacle: the boot process of many commodity OSes depends on legacy virtual devices absent from our hypervisor. Min-V introduces delusional boot, a mechanism that allows guest VMs run- ning commodity OSes

Hunt, Galen

408

INTRODUCTION The massive sulfide deposits of southern Spain  

E-Print Network [OSTI]

INTRODUCTION The massive sulfide deposits of southern Spain and Portugal were formed about 300 Ma). Spain became a Roman province, and mining of the rich deposits of the Iberian pyrite belt for copper, California 94025 A. Palanques Instituto de Ciencias del Mar, 08039 Barcelona, Spain ABSTRACT A metal

van Geen, Alexander

409

Effective Matter Cosmologies of Massive Gravity: Physical Fluids  

E-Print Network [OSTI]

We derive new cosmological solutions of the ghost-free massive gravity with a general background metric in which the contribution of the mass sector to the metric one is modeled by an effective cosmological constant and an ideal fluid which obeys the first law of thermodynamics; thus it satisfies the ordinary energy-momentum conservation or continuity equation.

Nejat Tevfik Yilmaz

2014-12-16T23:59:59.000Z

410

Generalized massive gravity in AdS{sub 3} spacetime  

SciTech Connect (OSTI)

In this note we investigate the generalized massive gravity in asymptotically AdS{sub 3} spacetime by combining the two mass terms of topological massive gravity and new massive gravity theory. We study the linearized excitations around the AdS{sub 3} background and find that at a specific value of a certain combination of the two mass parameters (chiral line), one of the massive graviton solutions becomes the left-moving massless mode. It is shown that the theory is chiral at this line under Brown-Henneaux boundary condition. Because of this degeneration of the gravitons the new log solution which has a logarithmic asymptotic behavior is also a solution to this gravity theory at the chiral line. The log boundary condition which was proposed to accommodate this log solution is proved to be consistent at this chiral line. The resulting theory is no longer chiral except at a special point on the chiral line, where another new solution with log-square asymptotic behavior exists. At this special point, we prove that a new kind of boundary condition called log-square boundary condition, which accommodates this new solution, can be consistent.

Liu Yan; Sun Yawen [Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, P. O. Box 2735, Beijing 100190 (China)

2009-06-15T23:59:59.000Z

411

Monitoring Massive Appliances by a Minimal Number of Smart Meters  

E-Print Network [OSTI]

56 Monitoring Massive Appliances by a Minimal Number of Smart Meters YONGCAI WANG, XIAOHONG HAO. This article presents a framework for deploying a minimal number of smart meters to accurately track the ON of required smart meters is studied by an entropy-based approach, which qualifies the impact of meter

Wang, Yongcai

412

THE FORMATION AND EVOLUTION OF THE FIRST MASSIVE BLACK HOLES  

E-Print Network [OSTI]

@astron.berkeley.edu Abstract The first massive astrophysical black holes likely formed at high redshifts (z > 10 (Eddington) luminosity, and converts mass to radiation with an efficiency of = Mc2 /LEdd 10%) and using to link the evolution of quasars with that of dark matter halos condensing in a cold dark matter (CDM

Wurtele, Jonathan

413

X-ray Emission from Massive Stars David Cohen  

E-Print Network [OSTI]

X-ray Emission from Massive Stars David Cohen Department of Physics and Astronomy Swarthmore University, Oct. 13, 2005 astro.swarthmore.edu/~cohen/ #12;Outline 1. What you need to know: a. X-rays from the Sun - magnetic activity, x-ray spectra b. Hot stars c. Radiation-driven winds and the Doppler shift d

Cohen, David

414

ANALYSIS OF DWPF SLUDGE BATCH 7A (MACROBATCH 8) POUR STREAM SAMPLES  

SciTech Connect (OSTI)

The Defense Waste Processing Facility (DWPF) began processing Sludge Batch 7a (SB7a), also referred to as Macrobatch 8 (MB8), in June 2011. SB7a is a blend of the heel of Tank 40 from Sludge Batch 6 (SB6) and the SB7a material that was transferred to Tank 40 from Tank 51. SB7a was processed using Frit 418. During processing of each sludge batch, the DWPF is required to take at least one glass sample to meet the objectives of the Glass Product Control Program (GPCP), which is governed by the DWPF Waste Compliance Plan, and to complete the necessary Production Records so that the final glass product may be disposed of at a Federal Repository. Three pour stream glass samples and two Melter Feed Tank (MFT) slurry samples were collected while processing SB7a. These additional samples were taken during SB7a to understand the impact of antifoam and the melter bubblers on glass redox chemistry. The samples were transferred to the Savannah River National Laboratory (SRNL) where they were analyzed. The following conclusions were drawn from the analytical results provided in this report: (1) The sum of oxides for the official SB7a pour stream glass is within the Product Composition Control System (PCCS) limits (95-105 wt%). (2) The average calculated Waste Dilution Factor (WDF) for SB7a is 2.3. In general, the measured radionuclide content of the official SB7a pour stream glass is in good agreement with the calculated values from the Tank 40 dried sludge results from the SB7a Waste Acceptance Program Specification (WAPS) sample. (3) As in previous pour stream samples, ruthenium and rhodium inclusions were detected by Scanning Electron Microscopy-Electron Dispersive Spectroscopy (SEM-EDS) in the official SB7a pour stream sample. (4) The Product Consistency Test (PCT) results indicate that the official SB7a pour stream glass meets the waste acceptance criteria for durability with a normalized boron release of 0.64 g/L, which is an order of magnitude less than the Environmental Assessment (EA) glass. (5) The measured density of the SB7a pour stream glass was 2.7 g/cm{sup 3}. (6) The Fe{sup 2+}/{Sigma}Fe ratios of the SB7a pour stream samples were in the range of 0.04-0.13, while the MFT sample glasses prepared by SRNL were in the range of 0.02-0.04.

Johnson, F.

2012-05-01T23:59:59.000Z

415

Analysis Of The Sludge Batch 7b (Macrobatch 9) DWPF Pour Stream Glass Sample  

SciTech Connect (OSTI)

The Defense Waste Processing Facility (DWPF) began processing Sludge Batch 7b (SB7b), also referred to as Macrobatch 9 (MB9), in January 2012. SB7b is a blend of the heel of Tank 40 from Sludge Batch 7a (SB7a) and the SB7b material that was transferred to Tank 40 from Tank 51. SB7b was processed using Frit 418. During processing of each sludge batch, the DWPF is required to take at least one glass sample to meet the objectives of the Glass Product Control Program (GPCP), which is governed by the DWPF Waste Form Compliance Plan, and to complete the necessary Production Records so that the final glass product may be disposed of at a Federal Repository. Two pour stream glass samples were collected while processing SB7b. The samples were transferred to the Savannah River National Laboratory (SRNL) where one was analyzed and the other was archived. The following conclusions were drawn from the analytical results provided in this report: The sum of oxides for the official SB7b pour stream glass is within the Product Composition Control System (PCCS) limits (95-105 wt%); The average calculated Waste Dilution Factor (WDF) for SB7b is 2.3. In general, the measured radionuclide content of the official SB7b pour stream glass is in good agreement with the calculated values from the Tank 40 dried sludge results from the SB7b Waste Acceptance Program Specification (WAPS) sample; As in previous pour stream samples, ruthenium and rhodium inclusions were detected by Scanning Electron Microscopy-Electron Dispersive Spectroscopy (SEM-EDS) in the SB7b pour stream sample; The Product Consistency Test (PCT) results indicate that the official SB7b pour stream glass meets the waste acceptance criteria for durability with a normalized boron release of 0.8 g/L, which is an order of magnitude less than the Environmental Assessment (EA) glass; The measured density of the SB7b pour stream glass was 2.70 g/cm{sup 3}; The Fe{sup 2+}/?Fe ratio of the SB7b pour stream samples was 0.07.

Johnson, F. C.; Crawford, C. L.; Pareizs, J. M.

2013-11-18T23:59:59.000Z

416

Production of cements from Illinois coal ash. Final technical report, September 1, 1995--August 31, 1996  

SciTech Connect (OSTI)

The objective of this program is to convert Illinois coal combustion residues, such as fly ash, bottom ash, and boiler slag, into novel cementitious materials for use in the construction industry. These residues are composed largely of SiO{sub 2}, Al{sub 2}O{sub 3}, Fe{sub 2}O{sub 3}, MgO, and CaO, which are also the major components of cement. Since the residues are used as an integral component of the cement and not just as additives to concrete, larger amounts of the residues can be utilized. The process uses submerged combustion to melt blends of coal combustion residues with lime, clay, and/or sand. The submerged combustion melter utilizes natural gas-oxidant firing directly into a molten bath to provide efficient melting of mineral-like materials. Use of this melter for cement production has many advantages over rotary kilns including very little, if any, grinding of the feed material, very low emissions, and compact size. During the first year of the program, samples of coal combustion residues were blended and mixed, as needed; with lime, clay, and/or sand to adjust the composition. Six mixtures, three with fly ash and three with bottom ash, were melted in a laboratory-scale furnace. The resultant products were used in mortar cubes and bars which were subjected to ASTM standard tests of cementitious properties. In the hydraulic activity test, mortar cubes were found to have a strength comparable to standard mortar cements. In the compressive strength test, mortar cubes were found to have strengths that exceeded ASTM blended cement performance specifications. In the ASR expansion test, mortar bars were subjected to alkali-silica reaction-induced expansion, which is a problem for siliceous aggregate-based concretes that are exposed to moisture. The mortar bars made with the products inhibited 85 to 97% of this expansion. These results show that residue-based products have an excellent potential as ASR-preventing additions in concretes.

Wagner, J.C.; Bhatty, J.L.; Mishulovich, A.

1997-05-01T23:59:59.000Z

417

International Best Practices for Pre-Processing and Co-Processing Municipal Solid Waste and Sewage Sludge in the Cement Industry  

E-Print Network [OSTI]

Co-processing Municipal Solid Waste and Sewage Sludge in theno date. “Integrated Solid Waste Management. ” Presentationincineration of Municipal Solid Waste in Cement Industry. :

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

418

International Best Practices for Pre-Processing and Co-Processing Municipal Solid Waste and Sewage Sludge in the Cement Industry  

E-Print Network [OSTI]

L.S. 2008. “Complete alternative fuel solution for cementKolyfetis, E. 2007. “Alternative Fuels & Raw Materials inof the workshop on Alternative Fuels & Alternative Raw

Hasanbeigi, Ali

2013-01-01T23:59:59.000Z

419

Plan d'action rgional pour la conservation des chimpanzs et des gorilles en Afrique Centrale Plan d'action rgional pour la conservation des chimpanzs  

E-Print Network [OSTI]

les lacunes en connaissances qu'il faut combler, à travers l'amélioration des méthodes de recensement par les chercheurs suggérant qu'ils avaient eu peu de contacts avec des humains auparavant. ©Nick gorilles de plaine d'Afrique Centrale. ©NickNichols,NGS #12;Plan d'action régional pour la conservation des

420

Mass dependence of the vacuum energy density in the massive Schwinger model  

E-Print Network [OSTI]

The vacuum energy density of the massive Schwinger model is shown to be not power expandable in the fermion mass.

Taekoon Lee

2007-03-09T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Cloud Futures Workshop 2010 Cloud Computing Support for Massively Social Gaming Alexandru Iosup  

E-Print Network [OSTI]

1 Cloud Futures Workshop 2010 ­ Cloud Computing Support for Massively Social Gaming Alexandru Iosup Pierre (Vrije U.). Cloud Computing Support for Massively Social Gaming (Rain for the Thirsty) #12;Cloud Futures Workshop 2010 ­ Cloud Computing Support for Massively Social Gaming 2 Intermezzo: Tips on how

Iosup, Alexandru

422

Maternit pour autrui : du dsir d'enfant l'enfant tout prix Sandrine de Montgolfier  

E-Print Network [OSTI]

parce qu'il constitue une provocation à l'abandon d'enfant (article 227-12 du code pénal). Quant à l'article 16-7 du Code civil, « toute convention portant sur la procréation ou la gestation pour le compte d

Paris-Sud XI, Université de

423

Vrification des Automates File Ractifs : un modle pour les systmes ractifs crits en  

E-Print Network [OSTI]

with the reactive language Electre. The behavioral model for Electre programs is the class of Reactive Fiffo, reconnaissabilité, décidabilité. KEY WORDS : Verification, reactive systems, Electre, infinite systems, modelVérification des Automates à File Réactifs : un modèle pour les systèmes réactifs écrits en Electre

Sutre, Grégoire

424

LES ECOTECHNOLOGIES POUR LES AGROSYSTEMES ECO-TECHNOLOGIES, ECO-CONCEPTION,  

E-Print Network [OSTI]

LES ECOTECHNOLOGIES POUR LES AGROSYSTEMES ECO-TECHNOLOGIES, ECO-CONCEPTION, EVALUATION INTEGREE plus acceptable, que les technologies qu'elles remplacent. Les problèmes méthodologiques qui se posent the resources and authorize the recycling of whole or part of their waste in a more acceptable way than

Paris-Sud XI, Université de

425

Systme de rapports d'incidents conforme aux normes ITIL pour le  

E-Print Network [OSTI]

Système de rapports d'incidents conforme aux normes ITIL pour le réseau A.S.T.R.I.D Mémoire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Aper¸cu d'ITIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Objectifs de ce m´emoire . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 ITIL 4 2.1 Introduction

Libre de Bruxelles, Université

426

Politique Qualit La certification ISO 9001:2008 aura pour objectif de garantir et de  

E-Print Network [OSTI]

Politique Qualité La certification ISO 9001:2008 aura pour objectif de garantir et de pérenniser la démarche qualité depuis 2010 selon la norme ISO 9001:2008. Les principaux processus, leurs interfaces et

Brest, Université de

427

An analytic formula for Macdonald polynomials Une formule analytique pour les polynomes de Macdonald  

E-Print Network [OSTI]

An analytic formula for Macdonald polynomials Une formule analytique pour les polynâ??omes de Macdonald Michel Lassalle and Michael Schlosser 5 mai 2003 Abstract We give the explicit analytic development of any Jack or Macdonald polynomial in terms of elementary (resp. modified complete) symmetric

Schlosser, Michael

428

Conception centree utilisateur de prototypes interactifs pour la gestion de contenu multimedia par similarite  

E-Print Network [OSTI]

Conception centr´ee utilisateur de prototypes interactifs pour la gestion de contenu multimedia par de donn´ees mul- timedia, adapt´ees `a des cas d'utilisation divers et pro- fils d'utilisateurs vari similaire? L'interface utilisateur au service des cas d'utilisation La navigation et manipulation de

Dupont, Stéphane

429

Un modle formel pour la gestion des connaissances J.-L. Ermine  

E-Print Network [OSTI]

- 1 - Un modèle formel pour la gestion des connaissances J.-L. Ermine Management et ingénierie des connaissances, modèles et méthodes Traité IC2, Série Management et Gestion des STIC Hermes-Lavoisier, 2008 hal'alignement stratégique de la gestion des connaissances 1. Introduction Pendant de nombreuses années, la recherche en

Boyer, Edmond

430

SIGECORIS : un simulateur pour explorer des modalits de gestion prventive des inondations  

E-Print Network [OSTI]

SIGECORIS : un simulateur pour explorer des modalités de gestion préventive des inondations réflexion sur la politique américaine, avance que la première ambition de toute politique de gestion des philosophies de gestion des inondations dont l'objectif serait la réduction des dommages. Le point de vue

Boyer, Edmond

431

EMACOP : Environnement Multimdia pour l'Acquisition et la gestion de COrpus Parole  

E-Print Network [OSTI]

EMACOP : Environnement Multimédia pour l'Acquisition et la gestion de COrpus Parole Vaufreydaz chers et leur utilisation, n'est pas, dans la plupart des cas, orientée vers un problème précis. En outre, cela aurait reporté une grande partie de la gestion (en particulier des fichiers) sur l

Boyer, Edmond

432

Pche et aquaculture : un atout pour l'amnagement des territoires ctiers  

E-Print Network [OSTI]

, Consultante Gestion littoral SIRENA-REPAL Guy Fontenelle, Professeur, AGROCAMPUS OUEST Centre de Rennes Enjeux fonciers Olivier Lozachmeur, Juriste Consultant en droit littoral L'axe 4 du FEP, un vivier d'idées et de, Chercheur, Ifremer Brest SESSION 2 UNE GESTION NOUVELLE AQUACULTURE POUR LE DEVELOPPEMENT DES TERRITOIRES

Paris-Sud XI, Université de

433

EcoMata : Un logiciel d'aide la dcision pour amliorer la gestion des cosystmes  

E-Print Network [OSTI]

EcoMata : Un logiciel d'aide à la décision pour améliorer la gestion des écosystèmes Yulong Zhao1 complexe comme dans le cas du contrôle de popu- lation. La dynamique d'évolution de chaque population (dans notre cas les espèces de poisson) est relativement facile à exprimer de manière qualitative. En revanche

Boyer, Edmond

434

Vol.6hiverprintemps2011 La fort est amnage pour la production de  

E-Print Network [OSTI]

nous intéresserons ici pour fins d'exemple à deux variables, le volume marchand d'essences feuillues et le volume marchand d'essences résineuses exprimés en m3 par hectare. Le volume marchand est le volume

Rivest, Louis-Paul

435

UNIVERSITE DE NICE SOPHIA ANTIPOLIS presente pour obtenir le dipl^ome d'  

E-Print Network [OSTI]

UNIVERSIT´E DE NICE SOPHIA ANTIPOLIS M´emoire pr´esent´e pour obtenir le dipl^ome d' Habilitation) Examinateurs: Jean-Luc GOUZ´E INRIA Sophia Antipolis (jury) Christophe PRIEUR CNRS Gipsa-lab Grenoble (jury

Chaves, Madalena

436

Proposition de sujet Diagnostics lasers avancs pour la combustion assiste par plasma  

E-Print Network [OSTI]

Proposition de sujet Diagnostics lasers avancés pour la combustion assistée par plasma Advanced Laser Diagnostics for Plasma Assisted Combustion Contexte : Les industries automobiles et aéronautiques.O., "Atmospheric pressure plasma diagnostics by OES, CRDS and TALIF,"

Bezerianos, Anastasia

437

Depuis les annes 1950, le recours l'automobile pour de courts  

E-Print Network [OSTI]

Depuis les années 1950, le recours à l'automobile pour de courts trajets quotidiens ne cesse de elles seules, à réduire le recours à l'automobile. La question se pose alors de cerner les conditions permettant de changer le comportement en matière de choix modal (bus ou automobile) : le station- nement ne

Paris-Sud XI, Université de

438

Pour obtenir le grade de DOCTEUR DE L'UNIVERSITE JOSEPH FOURIER  

E-Print Network [OSTI]

. GANDER Universit´e de Gen`eve Rapporteur Mr W.G. LARGE NCAR - Boulder Rapporteur Mme C. JAPHET Universit rapporter sur ces travaux. Ils ont enrichi ce manuscrit gr^ace `a leurs remarques toujours judicieuses, c^elant comp´etences scientifiques, dispo- nibilit´e et sympathie. Un grand merci `a Jim McWilliams pour m

Boyer, Edmond

439

Un algorithme volutionniste pour l'auto-apprentissage de groupes de robots mobiles autonomes  

E-Print Network [OSTI]

minirobots réactifs. Les principes sont appliqués à une étude de modélisation de chaînes sensori-motrices'agit, pour un ensemble de robots mobiles à deux roues motrices et équipés d'émetteurs et de récepteurs

Paris-Sud XI, Université de

440

Psychologie Franaise (2000), 45, 4, 295-306. Pour une thorie "motrice" de la simulation  

E-Print Network [OSTI]

1 Psychologie Française (2000), 45, 4, 295-306. Pour une théorie "motrice" de la simulation Joëlle-circuit", d'une manière qui n'engage pas directement une réponse motrice ; mais la simulation exploite les

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "massive cement pour" 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

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT E DE GRENOBLE  

E-Print Network [OSTI]

) Mod`eles de M´elanges Conjugu´es pour la Mod´elisation de la Perception Visuelle et Auditive Th-00584080,version2-12Dec2012 #12;UNIVERSITY OF GRENOBLE - JOSEPH FOURIER DOCTORAL SCHOOL MSTII MATHEMATIQUES smile and cheerful spirit, for those encouraging coffee breaks that would give a charge of energy

Paris-Sud XI, Université de

442

POUR UNE CULTURE DES ACCIDENTS AU SERVICE DE LA SECURITE INDUSTRIELLE  

E-Print Network [OSTI]

-organisational character), locate it in the state of art with regards to accidentology, safety and risk cultures. FinallyPOUR UNE CULTURE DES ACCIDENTS AU SERVICE DE LA SECURITE INDUSTRIELLE FOR A CULTURE OF ACCIDENTS DEVOTED TO INDUSTRIAL SAFETY Nicolas DECHY Yves DIEN Michel LLORY INERIS EDF R&D IAO, Mas Saint

Paris-Sud XI, Université de

443

Pour citer cet article : Expertise and Methodology in Building Design for Sustainable Development. Debizet G.,  

E-Print Network [OSTI]

Pour citer cet article : Expertise and Methodology in Building Design for Sustainable Development/ Chapter 9 Expertise and Methodology in Building Design for Sustainable Development : A Franco-British Comparison Gilles Debizet 1 and Martin Symes 2 Sustainability introduces new goals in building design

Paris-Sud XI, Université de

444

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT DE GRENOBLE  

E-Print Network [OSTI]

: développement d'un moyen expérimental et d'un moyen numérique pour l'étude de la cavitation Thèse soutenue................................................................................................................................................ 21 Chapitre 1 Généralités des turbines Darrieus .......................................................................... 23 1 Fonctionnement d'une turbine de type Darrieus

Paris-Sud XI, Université de

445

La dmarche Eco conception pour les bogies d'ALSTOM Transport  

E-Print Network [OSTI]

and the sustainable development through its Eco design approach. This allows managing the environmental risks, soil and for humans. This article provides an outline the approach of ALSTOM Transport on the basisLa démarche Eco conception pour les bogies d'ALSTOM Transport Julie LANDI (Ingénieur Eco conception

Boyer, Edmond

446

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT DE GRENOBLE  

E-Print Network [OSTI]

Polytechnique de Toulouse, Rapporteur M. Jean-Marc MENAUD Maître Assistant à l'Ecole des Mines de Nantes. Merci également à M. Jean-Marc Menaud, maître assistant à l'Ecole des Mines de Nantes, pour avoir

Boyer, Edmond

447

Pour obtenir le grade de DOCTEUR DE L'UNIVERSIT DE GRENOBLE  

E-Print Network [OSTI]

Polytechnique de Toulouse, Rapporteur M. Jean-Marc MENAUD Maître Assistant à l'Ecole des Mines de Nantes constructif. Merci également à M. Jean-Marc Menaud, maître assistant à l'Ecole des Mines de Nantes, pour avoir

Paris-Sud XI, Université de

448

Effect of pyrolyzed carbon black on asphalt cement. Part 2. Asphalt binder. Final report, September 1993-May 1995  

SciTech Connect (OSTI)

Scrap tires derived from automobiles have become a large environmental problem in the United States. In the study, research is carried out to investigate the potential use of tire-derived pyrolyzed carbon black from scrap tires as an asphalt cement modifier. The asphlat cements used in the research were AC10 and AC20. Penetration and softening point tests were performed to obtain the consistency of the asphalt cements. The pyrolyzed carbon black, as provided by Wolf Industries, was combined with the asphalt cement in the following percentages: 5%, 10%, 15% and 20%. Penetration, softening point and ductility tests were performed to determine the temperature susceptibility of the modified binder as altered by the pyrolyzed carbon black. In order that the results are comparable to previous testing, commercial carbon black purchased from CABOT Industry was also used as a modifier in the tests. The same test procedures were applied to the asphalt cements modified by commercial carbon black. The test results contained in the report illustrate the viability of the pyrolyzed carbon black as an asphalt modifier. Recommendations are provided to facilitate further research on this particular project. A preliminary assessment of a test road using the pyrolyzed carbon is appended.

Zeng, Y.; Lovell, C.W.

1996-02-20T23:59:59.000Z

449

Calcite cemented layers, their characterization and use in improving reservoir recovery from Murchison field, northern North Sea  

SciTech Connect (OSTI)

Murchison field is a mature development forming part of the Brent oil province in the East Shetland basin, northern North Sea. The productive reservoir consists of coastal deltaic sands of the Middle Jurassic Brent Group and is produced by a line-drive waterflood mechanism. The Rannoch Formation in Murchison, one of the field's most prolific producing zones, is characterized by the presence of calcite-cemented zones, known locally as doggers, which occlude all porosity and behave as vertical barriers to fluid flow. Geochemical-mineralogical analysis of the carbonate cements allied to sedimentological studies of host sandstone indicate that they occur as continuously cemented layers with relatively homogeneous compositions. Dogger occurrence is generally confined to the upper parts of individual coarsening-upward confined to the upper parts of individual coarsening-upward profile and sand bodies, characterized by low detrital clay and mica contents, low bioturbation, and high pre-cementation porosites and permeabilities. The carbonate bands are thus thought to represent zones of maximum pore water flow through high permeability conduits during burial diagenesis. Wireline correlation supported by core description indicates that at least three significant, laterally continuous calcite-cemented zones occur, the most extensive of which has a lateral extent of at least 5 km. All significant doggers have been mapped geologically and incorporated into the full-field reservoir simulation model. Based on this new understanding, a revised infill drilling and perforation strategy has been devised for the Rannoch Formation, aimed at improving recovery from this complex reservoir zone.

Warrender, J.M. (Conoco Ltd., Aberdeen (United Kingdom)); Spears, D.A. (Univ. of Sheffield (United Kingdom))

1991-08-01T23:59:59.000Z

450

Lectures on BRS invariance for massive boson fields  

E-Print Network [OSTI]

These notes correspond to lectures given at the Villa de Leyva Summer School in Colombia (July 2007). Our main purpose in this short course on BRS invariance of gauge theories is to illuminate corners of the theory left in the shade by standard treatments. The plan is as follows. First a review of Utiyama's "general gauge theory". Promptly we find a counterexample to it in the shape of the massive spin-1 Stueckelberg gauge field. This is not fancy, as the massive case is the most natural one to introduce BRS invariance in the context of free quantum fields. Mathematically speaking, the first part of the course uses Utiyama's notation, and thus has the flavour and non-intrinsic notation of standard physics textbooks. Next we deal with boson fields on Fock space and BRS invariance in connection with the existence of Krein operators; the attending rigour points are then addressed.

Jose M. Gracia-Bondia

2010-04-26T23:59:59.000Z

451

Vacua and instantons of ghost-free massive gravity  

E-Print Network [OSTI]

Recently discovered models of ghost-free massive gravity and bigravity are characterized by a non-trivial potential that gives rise to a rich vacuum structure. We review maximally symmetric vacua of the de Rham-Gabadadze-Tolley (dRGT) massive gravity and of the Hassan-Rosen (HR) bigravity, and discuss their perturbative stability. In particular, we discuss perturbations about self-accelerating vacua in HR bigravity, and argue that, analogously to what was found in the case of dRGT gravity, some of them contain strongly coupled modes. We then show that it is impossible to construct regular instantons connecting different classically stable vacua of dRGT gravity without violating energy conservation or the null energy condition.

Minjoon Park; Lorenzo Sorbo

2012-12-12T23:59:59.000Z

452

Secular stability and instability in stellar systems surrounding massive objects  

E-Print Network [OSTI]

We examine the stability of a low-mass stellar system surrounding a massive central object. Examples of such systems include the centers of galaxies or star clusters containing a massive black hole, and the Oort comet cloud. If the self-gravity of the stellar system is the dominant non-Keplerian force, such systems may be subject to slowly growing (secular) lopsided instabilities. Stability to secular modes is largely determined by the dependence of the distribution function F on angular momentum J. If dF/dJ 0, as is expected if there is a loss cone at low angular momentum, all spherical systems in which F=0 at J=0 (an empty loss cone) are only neutrally stable, and flattened, non-rotating systems are generally unstable. These results suggest that secular instabilities may dominate the structure and evolution of the stellar systems in the centers of galaxies.

Scott Tremaine

2004-12-13T23:59:59.000Z

453

Infrared Singularities and Soft Gluon Resummation with Massive Partons  

E-Print Network [OSTI]

Infrared divergences of QCD scattering amplitudes can be derived from an anomalous dimension matrix, which is also an essential ingredient for the resummation of large logarithms due to soft gluon emissions. We report a recent analytical calculation of the anomalous dimension matrix with both massless and massive partons at two-loop level, which describes the two-loop infrared singularities of any scattering amplitudes with an arbitrary number of massless and massive partons, and also enables soft gluon resummation at next-to-next-to-leading-logarithmic order. As an application, we calculate the infrared poles in the q qbar -> t tbar and gg -> t tbar scattering amplitudes at two-loop order.

A. Ferroglia; M. Neubert; B. D. Pecjak; L. L. Yang

2010-06-24T23:59:59.000Z

454

A Grid of FASTWIND NLTE Model Atmospheres of Massive Stars  

E-Print Network [OSTI]

In the last few years our knowledge of the physics of massive stars has improved tremendously. However, further investigations are still needed, especially regarding accurate calibrations of their fundamental parameters. To this end, we have constructed a comprehensive grid of NLTE model atmospheres and corresponding synthetic spectra in the massive star domain. The grid covers the complete B type spectral range, extended to late O on the hot side and early A on the cool side, from supergiants to dwarfs and from weak stellar winds to very strong ones. It has been calculated with the latest version of the FASTWIND code. The analysis of an extensive sample of OB stars in the framework of the COROT space mission will lead to accurate calibrations of effective temperatures, gravities, mass loss rates etc. This paper contains a detailed description of the grid, which has been baptised as BSTAR06 and which will be available for further research in the near future.

K. Lefever; J. Puls; C. Aerts

2006-09-22T23:59:59.000Z

455

Black Holes with Quantum Massive Spin-2 Hair  

E-Print Network [OSTI]

We show that black holes can posses a long range quantum mechanical hair associated with a massive spin-2 field, which can be detected by a stringy generalization of the Aharovon-Bohm effect, in which a string loop lassoes the black hole. The long distance effect persist for arbitrarily high mass of the spin-2 field. An analogous effect is exhibited by a massive antisymmetric two-form field. We make a close parallel between the two and the ordinary Aharonov-Bohm phenomenon, and also show that in the latter case the effect can be experienced even by the electrically-neutral particles, provided some boundary terms are added to the action.

Gia Dvali

2006-05-31T23:59:59.000Z

456

EVALUATION OF THE IMPACT OF THIN POURS ON SALTSTONE PROPERTIES  

SciTech Connect (OSTI)

The proposed Saltstone Disposal Unit 6 (SDU6) is a larger structure than the SDU4 cells and larger than the disposal units (SDU2, SDU3, and SDU5) currently in use or under construction. The additional capacity provided by SDU6 is desired to reduce life cycle costs and support site accelerated closure goals. The larger size of the planned SDU6 could result in saltstone being placed in thinner lifts as the unit is filled. This study was performed to determine whether thinner layers of saltstone negatively impact the performance of the waste form. A larger number of cold joints could potentially result in increased drying, salt deposition, and surface oxidation. A matrix of samples was prepared to simulate thin pours ranging from 0.5 to 6 inches thick. Each sample was cured for at least 28 days prior to further characterization. Leachability results showed that there is no obvious impact of the number of grout layers on the Leachability Index values for Na and NO{sub 3}. The concentrations of Cr, NO{sub 2}, and C{sub 2}O{sub 4} were below detection limits for all of the leachates. No attempt was made to evaluate the oxidation of these samples since no measureable Cr was leached, although this would appear to indicate that Cr in the samples remained reduced for cold joints with surfaces exposed for approximately four days. The results of hydraulic conductivity measurements showed that the number of cold joints in the samples did not have a significant impact on the measured values for the vertical lift orientation (i.e., when the flow path is perpendicular to the cold joints). For the horizontal lift orientation (i.e., when the flow path is parallel to the cold joints), the number of cold joints in the samples also did not appear to have a significant impact on hydraulic conductivity. The measured hydraulic conductivity was faster when the flow path was parallel to the cold joints as compared to when the flow path was perpendicular to the cold joints. Percolation testing showed increased flow when the number of cold joints was increased. Compressive strength testing showed that the maximum load at the onset of cracking was reduced by approximately 26% for those samples that contained cold joints as compared to the monolithic samples. The number of cold joints in the sample had no significant impact on the maximum load prior to cracking. The porosity of the samples was not influenced by cold joints. This result was expected as the porosity is a material property affected by the properties of the components (premix and salt solution) and the water to premix ratio. Overall, the only obvious impact of cold joints in the samples was to significantly increase hydraulic conductivity in the direction parallel to the cold joints. An increasing number of cold joints (thin layers) in the simulated saltstone samples did not exacerbate this effect, nor did it have a negative impact on the Leachability Indices or porosity for surfaces exposed for approximately four days. The presence of a cold joint reduced the compressive strength of the material, although this impact was seen regardless of the number of cold joints in the sample.

Cozzi, A.; Langton, C.; Fox, K.

2012-10-02T23:59:59.000Z

457

A symmetric approach to the massive nonlinear sigma model  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

In the present paper we extend to the massive case the procedure of divergences subtraction, previously introduced for the massless nonlinear sigma model (D = 4). Perturbative expansion in the number of loops is successfully constructed. The resulting theory depends on the Spontaneous Symmetry Breaking parameter v, on the mass m and on the radiative correction parameter ?. Fermions are not considered in the present work. SU(2)?­SU(2) is the group used.

Ferrari, Ruggero

2011-09-28T23:59:59.000Z

458

From massive gravity to dark matter density II  

E-Print Network [OSTI]

As previously observed the massless limit of massive gravity leads to a modification of general relativity. Here we study spherically symmetric solutions of the modified field equations which contain normal matter together with a dark energy density. If the dark density profile is assumed to be known, the whole problem is reduced to a linear first order differential equation which can be solved by quadratures.

G. Scharf

2009-02-18T23:59:59.000Z

459

On the Solutions of Einstein Equations with Massive Point Source  

E-Print Network [OSTI]

We show that Einstein equations are compatible with the presence of massive point particles and find corresponding two parameter family of their solutions which depends on the bare mechanical mass $M_0>0$ and the Keplerian mass $M

P. P. Fiziev

2004-12-30T23:59:59.000Z

460

The massive transformation in Ti-Al alloys: mechanistic observations  

SciTech Connect (OSTI)

The massive {alpha}{yields}{gamma}{sub m} transformation, as observed using analytical transmission electron microscopy, in Ti-49Al, Ti-48Al-2Nb-2Mn, Ti-55Al-25Ta and Ti-50Al-20Ta alloys is described. Conventional solution heating and quenching experiments have been combined with the more rapid quenching possible using electron beam melting in order to provide further insight into the early stages of the transformation of these alloys. It is shown that the {gamma} develops first at grain boundaries as lamellae in one of the grains and that these lamellae intersect and spread into the adjacent grain in a massive manner. Consequently, there is no orientation relationship between the massive gamma ({gamma}{sub m}) and the grain being consumed whereas there is the expected relation between the {gamma}{sub m} and the first grain which is inherited from the lamellae. It is further shown that the {gamma}{sub m} grows as an f.c.c. phase after initially growing with the L1{sub 0} structure. Furthermore, it is shown that the massive f.c.c. phase then orders to the L1{sub 0} structure producing APDB-like defects which are actually thin 90{degree} domains separating adjacent domains that have the same orientation yet are out of phase. The advancing {gamma}{sub m} interface tends to facet parallel either to one of its four {l_brace}111{r_brace} planes or to the basal plane in the grain being consumed by impinging on existing {gamma} lamellae. Thin microtwins and {alpha}{sub 2} platelets then form in the {gamma}{sub m} presumably due, respectively, to transformation stresses and supersaturation of the {gamma}{sub m} with titanium for alloys containing {approximately}48% Al; indeed, there is a local depletion in aluminium across the {alpha}{sub 2} platelets as determined using fine probe microanalysis.

Zhang, X.D.; Godfrey, S.; Weaver, M.; Strangwood, M.; Kaufman, M.J.; Loretto, M.H. [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications] [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications; Threadgill, P. [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications] [Univ. of Birmingham, Edgbaston (United Kingdom). IRC in Materials for High Performance Applications; [TWI, Cambridge (United Kingdom)

1996-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "massive cement pour" 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

Double Diffusion in Enclosure Bounded by Massive and Volatilizing Walls  

E-Print Network [OSTI]

ICEBO2006, Shenzhen, China Maximize Comfort: Temperature, Humidity and IAQ Vol.I-6-5 Double Diffusion in Enclosure Bounded by Massive and Volatilizing Walls Di Liu Guangfa Tang Fuyun Zhao Doctoral Professor.... INTRODUCTION It has become evident that building products are major contributors to the pollution of the indoor air environment with volatile organic compounds (VOCs) [1]. The indoor airflow and temperature distributions also have influence on the emission...

Liu, D.; Tang, G.; Zhao, F.

2006-01-01T23:59:59.000Z

462

Black holes in Born-Infeld extended new massive gravity  

SciTech Connect (OSTI)

In this paper we find different types of black holes for the Born-Infeld extended new massive gravity. Our solutions include (un)charged warped (anti-)de Sitter black holes for four and six derivative expanded action. We also look at the black holes in unexpanded Born-Infeld action. In each case we calculate the entropy, angular momentum and mass of the black holes. We also find the central charges for the conformal field theory duals.

Ghodsi, Ahmad; Yekta, Davood Mahdavian [Department of Physics, Ferdowsi University of Mashhad, P.O. Box 1436, Mashhad (Iran, Islamic Republic of)

2011-05-15T23:59:59.000Z

463

Static, massive fields and vacuum polarization potential in Rindler space  

E-Print Network [OSTI]

In Rindler space, we determine in terms of special functions the expression of the static, massive scalar or vector field generated by a point source. We find also an explicit integral expression of the induced electrostatic potential resulting from the vacuum polarization due to an electric charge at rest in the Rindler coordinates. For a weak acceleration, we give then an approximate expression in the Fermi coordinates associated with the uniformly accelerated observer.

B. Linet

1997-04-03T23:59:59.000Z

464

Which Massive stars are Gamma-Ray Burst Progenitors?  

E-Print Network [OSTI]

The collapsar model for gamma-ray bursts requires three essential ingredients: a massive core, removal of the hydrogen envelope, and enough angular momentum in the core. We study current massive star evolution models of solar metallicity to determine which massive star physics is capable of producing these ingredients. In particular, we investigate the role of hydrodynamic and magnetic internal angular momentum transport and binary mass and angular momentum transfer. We follow the evolution of rotating single stars and of binary systems that include rotational processes for both stars. Neglecting magnetic fields, we show that the cores of massive single stars can maintain a high specific angular momentum when evolved with the assumption that mean molecular weight gradients suppress rotational mixing processes. In binary systems that undergo mass transfer during core hydrogen burning the mass receiving star accretes large amounts of high angular momentum material, leading to a spin-up of the core. We find, however, that this merely compensates for the tidal angular momentum loss due to spin-orbit coupling, which leads to synchronous rotation before the mass transfer event. Therefore the resulting cores do not rotate faster than in single stars. We also present models that include magnetic fields generated by differential rotation and we consider the internal angular momentum transport by magnetic torques. We investigate the capability of magnetic torques to efficiently pump angular momentum into the cores of accreting stars. Despite our finding that this mechanism works, the magnetic coupling of core and envelope after the accreting star ends core hydrogen burning leads to slower rotation than in the non-magnetic case.

Jelena Petrovic; Norbert Langer; Sung-Chul Yoon; Alexander Heger

2005-04-11T23:59:59.000Z

465

Filaments, Collapse and Outflows in Massive Star Formation  

E-Print Network [OSTI]

We present results from our numerical simulations of collapsing massive molecular cloud cores. These numerical calculations show that massive stars assemble quickly with mass accretion rates exceeding 10^-3 Msol/yr and confirm that the mass accretion during the collapsing phase is much more efficient than predicted by selfsimilar collapse solutions, dM/dt ~ c^3/G. We find that during protostellar assembly out of a non-turbulent core, the mass accretion reaches 20 - 100 c^3/G. Furthermore, we explore the self-consistent structure of bipolar outflows that are produced in our three dimensional magnetized collapse simulations. These outflows produce cavities out of which radiation pressure can be released, thereby reducing the limitations on the final mass of massive stars formed by gravitational collapse. Additional enhancement of the mass accretion rate comes from accretion along filaments that are built up by supersonic turbulent motions. Our numerical calculations of collapsing turbulent cores result in mass accretion rates as high as 10^-2 Msol/yr.

Robi Banerjee; Ralph E. Pudritz

2008-07-04T23:59:59.000Z

466

The Massive Star Population of Cygnus OB2  

E-Print Network [OSTI]

We have compiled a significantly updated and comprehensive census of massive stars in the nearby Cygnus OB2 association by gathering and homogenising data from across the literature. The census contains 169 primary OB stars, including 52 O-type stars and 3 Wolf-Rayet stars. Spectral types and photometry are used to place the stars in a Hertzprung-Russell diagram, which is compared to both non-rotating and rotating stellar evolution models, from which stellar masses and ages are calculated. The star formation history and mass function of the association are assessed, and both are found to be heavily influenced by the evolution of the most massive stars to their end states. We find that the mass function of the most massive stars is consistent with a `universal' power-law slope of Gamma = 1.3. The age distribution inferred from stellar evolutionary models with rotation and the mass function suggest the majority of star formation occurred more or less continuously between 1 and 7 Myr ago, in agreement with studi...

Wright, Nicholas J; Mohr-Smith, Michael

2015-01-01T23:59:59.000Z

467

Three dimensional Casimir piston for massive scalar fields  

E-Print Network [OSTI]

We consider Casimir force acting on a three dimensional rectangular piston due to a massive scalar field subject to periodic, Dirichlet and Neumann boundary conditions. Exponential cut-off method is used to derive the Casimir energy in the interior region and the exterior region separated by the piston. It is shown that the divergent term of the Casimir force acting on the piston due to the interior region cancels with that due to the exterior region, thus render a finite well-defined Casimir force acting on the piston. Explicit expressions for the total Casimir force acting on the piston is derived, which show that the Casimir force is always attractive for all the different boundary conditions considered. As a function of a -- the distance from the piston to the opposite wall, it is found that the magnitude of the Casimir force behaves like $1/a^4$ when $a\\to 0^+$ and decays exponentially when $a\\to \\infty$. Moreover, the magnitude of the Casimir force is always a decreasing function of a. On the other hand, passing from massless to massive, we find that the effect of the mass is insignificant when a is small, but the magnitude of the force is decreased for large a in the massive case.

S. C. Lim; L. P. Teo

2008-07-23T23:59:59.000Z

468

Three-dimensional Casimir piston for massive scalar fields  

SciTech Connect (OSTI)

We consider Casimir force acting on a three-dimensional rectangular piston due to a massive scalar field subject to periodic, Dirichlet and Neumann boundary conditions. Exponential cut-off method is used to derive the Casimir energy. It is shown that the divergent terms do not contribute to the Casimir force acting on the piston, thus render a finite well-defined Casimir force acting on the piston. Explicit expressions for the total Casimir force acting on the piston is derived, which show that the Casimir force is always attractive for all the different boundary conditions considered. As a function of a - the distance from the piston to the opposite wall, it is found that the magnitude of the Casimir force behaves like 1/a{sup 4} when a{yields}0{sup +} and decays exponentially when a{yields}{infinity}. Moreover, the magnitude of the Casimir force is always a decreasing function of a. On the other hand, passing from massless to massive, we find that the effect of the mass is insignificant when a is small, but the magnitude of the force is decreased for large a in the massive case.

Lim, S.C. [Faculty of Engineering, Multimedia University, Jalan Multimedia, Cyberjaya 63100, Selangor Darul Ehsan (Malaysia)], E-mail: sclim@mmu.edu.my; Teo, L.P. [Faculty of Information Technology, Multimedia University, Jalan Multimedia, Cyberjaya 63100, Selangor Darul Ehsan (Malaysia)], E-mail: lpteo@mmu.edu.my

2009-08-15T23:59:59.000Z

469

Einstein Gravity, Massive Gravity, Multi-Gravity and Nonlinear Realizations  

E-Print Network [OSTI]

The existence of a ghost free theory of massive gravity begs for an interpretation as a Higgs phase of General Relativity. We revisit the study of massive gravity as a Higgs phase. Absent a compelling microphysical model of spontaneous symmetry breaking in gravity, we approach this problem from the viewpoint of nonlinear realizations. We employ the coset construction to search for the most restrictive symmetry breaking pattern whose low energy theory will both admit the de Rham--Gabadadze--Tolley (dRGT) potentials and nonlinearly realize every symmetry of General Relativity, thereby providing a new perspective from which to build theories of massive gravity. In addition to the known ghost-free terms, we find a novel parity violating interaction which preserves the constraint structure of the theory, but which vanishes on the normal branch of the theory. Finally, the procedure is extended to the cases of bi-gravity and multi-vielbein theories. Analogous parity violating interactions exist here, too, and may be non-trivial for certain classes of multi-metric theories.

Garrett Goon; Kurt Hinterbichler; Austin Joyce; Mark Trodden

2014-12-18T23:59:59.000Z

470

Probing Massive Stars Around Gamma-Ray Burst Progenitors  

E-Print Network [OSTI]

Long Gamma-Ray Bursts (GRBs) are produced by ultra-relativistic jets launched from core collapse of massive stars. Most massive stars form in binaries and/or in star clusters, which means that there may be a significant external photon field (EPF) around the GRB progenitor. We calculate the inverse-Compton scattering of EPF by the hot electrons in the GRB jet. Three possible cases of EPFs are considered: the progenitor is (I) in a massive binary system, (II) surrounded by a Wolf-Rayet-star wind, and (III) in a dense star cluster. Typical luminosities of 10^47 - 10^50 erg/s in the 10 - 100 GeV band are expected, depending on the stellar luminosity, binary separation (I), wind mass loss rate (II), stellar number density (III), etc. We calculate the lightcurve and spectrum in each case, taking fully into account the equal-arrival time surfaces and possible pair-production absorption with the prompt gamma-rays. Observations can put constraints on the existence of such EPFs (and hence on the nature of GRB progenit...

Lu, Wenbin; Smoot, George F

2015-01-01T23:59:59.000Z

471

Thermal stability of certain hydrated phases in systems made using portland cement. Final report  

SciTech Connect (OSTI)

As part of the study of hydraulic-cement system for use in possible underground isolation of nuclear wastes, this study was made to determine the temperature stability of ettringite and chloroaluminate. Either or both of these phases may be expected in a hydraulic cement system depending on the presence of salt (NaCl). The study of ettringite was made using 15 mixtures that contained portland cement, plaster, 2 levels of water, and in some mixtures, 1 of 6 pozzolans (3 fly ashes, 1 slag, a silica fume, a natural pozzolan), plus a 16th mixture with anhydrous sodium sulfate replacing plaster (CaSO4 . 1/2H20). Specimens were made and stored at 23, 50, and 75 C or 23, 75, and 100 C (all four temperatures in one case) for periodic examination by x-ray diffraction for phase compositiion and ettringite stability, and testing for compressive strength and restrained expansion. A more limited study of the stability of chloroaluminate was made along the same lines using fewer mixtures, salt instead of plaster, and higher temperatures plus some pressure. It was found that while some ettringette was decomposed at 75 C, depending on the composition of the mixture, all ettringite was undetectable by x-ray diffraction at 100 C, usually within a few days. The evidence indicates that the ettringite became amorphous and no significant test phases formed in its place. Since there was no corresponding loss in strength or reduction in volume, this loss of ettringite crystallinity was considered to be damaging. Based on much more limited data, chloroaluminate was found to decompose between 130 C at 25 psi and 170 C at 100 psi; no significant phases replaced it.

Buck, A.D.; Burkes, J.P.; Poole, T.S.

1985-08-01T23:59:59.000Z

472

Effect of MgO Additive on Volumetric Expansion of Self-Degradable Cements  

SciTech Connect (OSTI)

We identified hard-burned magnesium oxide (MgO) as a suitable expansive additive for improving the plugging performance of self-degradable, temporary sodium silicate-activated slag/Class C fly ash (SSASC) blend cement sealers into rock fractures in Enhanced Geothermal Systems (EGSs). MgO extended the volumetric expansion of sealers during their exposure to a hydrothermal environment at 200 C under pressures, ranging from 300 to 1500 psi. A great expansion ratc of 19.3% was observed by adding 3.0 wt% MgO under 300 psi pressure, thus promising to plug thoroughly inner fracture. When the pressure was increased from 300 psi to 1500 psi, the expansion rate of cement markedly reduced, corresponding to the formaLion of crack-free specimens and the improvement of compressive strength. However, with 3.0 wt% MgO, the specimens still engendered the generation of numerous visual cracks, although they were prepared under a high pressure of 1500 psi. The effective content of MgO in minimizing and eliminating the generation of cracks was 2.0 wt%, which provided a moderate expansion of {ge} 0.5%. The compressive strength of 2.0 wt% MgO specimens made under a pressure of 300 psi rose {approx} 1.7-fold to 4816 psi with an increasing pressure to 1500 psi. The in-situ growth of brucite crystal formed by the hydrothermal hydration of MgO was responsive for such an expansion of the SSASC cement; meanwhile. two crystalline hydrothermal reaction products, 1.1 nm tobermorite and calcium silicate hydrated, contributed to the development of the sealer's compressive strength. Thus, the increasing pressure seems to suppress and control a growth rate of brucite crystal in response to a lower extension of expansion. Furthermore, all MgO-conlaining SSASC sealers possessed the water-catalyzed self-degradable properties.

Sugama T.; Warren, J.; Butcher, T.

2011-09-30T23:59:59.000Z

473

Alkali-aggregate reaction in concrete containing high-alkali cement and granite aggregate  

SciTech Connect (OSTI)

The paper discusses results of the research into the influence of high-alkali Portland cement on granite aggregate. The deformation of the concrete structure occurred after 18 months. The research was carried out by means of a scanning electron microscope equipped with a high-energy dispersive X-ray analyzer that allowed observation of unpolished sections of concrete bars exhibiting the cracking pattern typical of the alkali-silica reaction. Both the microscopic observation and the X-ray elemental analysis confirm the presence of alkali-silica gel and secondary ettringite in the cracks.

Owsiak, Z

2004-01-01T23:59:59.000Z

474

Controlling the set of carbon-fiber embedded cement with electric current  

DOE Patents [OSTI]

A method for promoting cement or concrete set on demand for concrete that has been chemically retarded by adding carbon fiber to the concrete, which enables it to become electrically conductive, sodium tartrate retardant, and copper sulfate which forms a copper tartrate complex in alkaline concrete mixes. Using electricity, the concrete mix anodically converts the retarding tartrate to an insoluble polyester polymer. The carbon fibers act as a continuous anode surface with a counter electrode wire embedded in the mix. Upon energizing, the retarding effect of tartrate is defeated by formation of the polyester polymer through condensation esterification thereby allowing the normal set to proceed unimpeded.

Mattus, Alfred J.

2004-06-15T23:59:59.000Z

475

Carbonation Behavior of Pure Cement Hydrates under Supercritical Carbon Dioxide Conditions - 12199  

SciTech Connect (OSTI)

Carbonation of cement-based waste forms using a supercritical carbon dioxide (SCCO{sub 2}) is a developing technology for the waste immobilization of radioactive and non-radioactive wastes. However, the detail carbonation behaviors of cement matrices under the SCCO{sub 2} condition are unknown, since cement matrices forms very complex phases. In this study, in order to clarify the crystal phases, we synthesized pure cement hydrate phases as each single phases; portlandite (Ca(OH){sub 2}), ettringite (Ca{sub 6}Al{sub 2}(SO{sub 4}){sub 3}(OH){sub 12}.26H{sub 2}O), and calcium silicate hydrate (n CaO---m SiO{sub 2} ---x H{sub 2}O), using suspensions containing a stoichiometric mixture of chemical regents, and performed carbonation experiments using an autoclave under supercritical condition for carbon dioxide. The XRD results revealed both the carbonate phases and co-product phases depending on the initial hydrate phases; gypsum for Ettringite, amorphous or crystalline silica for calcium silicate hydroxide. Thermogravimetric analysis was also performed to understand carbonation behaviors quantitatively. According to the experimental results, it was found that the major reaction was formation of calcium carbonate (CaCO{sub 3}) in all cases. However, the behaviors of H{sub 2}O and CO{sub 2} content were quietly different: Portlandite was most reactive for carbonation under SCCO{sub 2} conditions, and the CO{sub 2} content per one molar CaO was ranged from 0.96 ? 0.98. In the case of Ettringite, the experiment indicates partial decomposition of ettringite phase during carbonation. Ettringite was comparatively stable even under the SCCO{sub 2} conditions. Therefore, a part of ettringite remained and formed similar phases after the ettringite carbonation. The CO{sub 2} content for ettringite showed almost constant values around 0.86 ? 0.87. In the case of calcium silicate hydrate, the carbonation behavior was significantly influenced by the condition of SCCO{sub 2}. The CO{sub 2} content for the calcium silicate hydrate had values that ranged from 0.51 ? 1.01. The co-products of the carbonation were gypsum (CaSO{sub 4}) for ettringite, silica gel (SiO{sub x}) and silica (SiO{sub 2}) for calcium silicate hydrate, which also contributed to the densification of the particles. The production of co-products enhanced the change to their morphology after the carbonation. (authors)

Hirabayashi, Daisuke; Enokida, Youichi [Graduate School of Engineering, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya-shi, Aichi-ken, 464-8603 (Japan); Sawada, Kayo [EcoTopia Science Institute, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya-shi, Aichi-ken, 464-8603 (Japan); Hertz, Audrey; Charton, Frederic [CEA, DEN, Marcoule, DTCD/SPDE/L2ED, BP 17171, F-30207 Bagnols-sur-Ceze (France); Frizon, Fabien [CEA, DEN, Marcoule, DTCD/SPDE/LFSM, BP 17171, F-30207 Bagnols-sur-Ceze (France); Brouno, Fournel [CEA, DEN, Marcoule, DTCD, BP 17171, F-30207 Bagnols-sur-Ceze (France)

2012-07-01T23:59:59.000Z

476

Appearance of the first cemental annulation of permanent incisor teeth of the domestic cat (Felis catus)  

E-Print Network [OSTI]

of MASTER OF SCIENCE August 19S3 Major Subject: Veterinary Anatomy APPEARANCE OF THE FIRST CEMENTAL ANNULATION OF THE FFRMANENT INCISOR TEETH OF THE DOMEST'C CAT (EEL IS CATL'S) A Thesis by IN-BACK CHOI Approved as to styie and content by: is, D. V.... the Domestic Cat (Felis catus). (August 1983) In-Back Choi, D. V. M. , Seoul National University Cnairman of Advisory Committee: Dr. R. F. Sis O. V. M. , Ph. D. Fourteen incisors from three female and four male cats (2. 5 to 15. 5 months of age) were...

Choi, In-Back

1983-01-01T23:59:59.000Z

477

Manufacturing Energy and Carbon Footprint - Sector: Cement (NAICS 327310), January 2014 (MECS 2010)  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department of Energy Low-TemperatureEnergyAll Manufacturing (NAICS 31-33)Cement

478

Cement Creek Ranch Pool & Spa Low Temperature Geothermal Facility | Open  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160Benin:Energy Information on PV EconomicsOregon: Energy ResourcesCeilingCement

479

Phyllosilicate orientation demonstrates early timing of compactional stabilization in calcite-cemented concretions in the Barnett Shale (Late Mississippian), Fort Worth  

E-Print Network [OSTI]

-cemented concretions in the Barnett Shale (Late Mississippian), Fort Worth Basin, Texas (U.S.A) Ruarri J. Day-Stirrat a in revised form 8 April 2008 Accepted 16 April 2008 Keywords: Barnett Shale Goniometry Concretions Fabric Calcite-cemented zones in the prolific gas-producing Barnett Shale (Ft. Worth Basin, Texas) preserve very

480

Energy Efficiency Improvement and Cost Saving Opportunities for Cement Making. An ENERGY STAR Guide for Energy and Plant Managers  

SciTech Connect (OSTI)

The cost of energy as part of the total production costs in the cement industry is significant, warranting attention for energy efficiency to improve the bottom line. Historically, energy intensity has declined, although more recently energy intensity seems to have stabilized with the gains. Coal and coke are currently the primary fuels for the sector, supplanting the dominance of natural gas in the 1970s. Most recently, there is a slight increase in the use of waste fuels, including tires. Between 1970 and 1999, primary physical energy intensity for cement production dropped 1 percent/year from 7.3 MBtu/short ton to 5.3 MBtu/short ton. Carbon dioxide intensity due to fuel consumption and raw material calcination dropped 16 percent, from 609 lb. C/ton of cement (0.31 tC/tonne) to 510 lb. C/ton cement (0.26 tC/tonne). Despite the historic progress, there is ample room for energy efficiency improvement. The relatively high share of wet-process plants (25 percent of clinker production in 1999 in the U.S.) suggests the existence of a considerable potential, when compared to other industrialized countries. We examined over 40 energy efficient technologies and measures and estimated energy savings, carbon dioxide savings, investment costs, and operation and maintenance costs for each of the measures. The report describes the measures and experiences of cement plants around the wold with these practices and technologies. Substantial potential for energy efficiency improvement exists in the cement industry and in individual plants. A portion of this potential will be achieved as part of (natural) modernization and expansion of existing facilities, as well as construction of new plants in particular regions. Still, a relatively large potential for improved energy management practices exists.

Galitsky, Christina; Worrell, Ernst; Galitsky, Christina

2008-01-01T23:59:59.000Z

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


481

An evaluation of the carbonate cements and their diagenesis on selected banks, outer Continental Shelf: northern Gulf of Mexico  

E-Print Network [OSTI]

solutions were exact replicates of Mg-calcites formed within the marine environment. Th1s implies that the 20 composition of the cement cannot be determined on the basis of crystal morphology alone (Badiozamani et al, 1977). The literature on carbonate... in that needle-fiber cements are the needles of calcite growing on minute root hairs (Ward, 1975). Care should be taken not to confuse the two. ~S he uiitic c me ts are also aao ite cemeets. The eedias th t comprise the cone shaped bundles are from 1-5 u wide...

Stafford, John Michael

1982-01-01T23:59:59.000Z

482

Méthodologie d'analyse de défaillance pour l'évaluation de la fiabilité de diodes électroluminescentes GaN.  

E-Print Network [OSTI]

??Ce mémoire s'inscrit dans la construction d'une méthodologie d'analyse de défaillance pour l'évaluation de la fiabilité de diodes électroluminescentes, par une approche basée sur l'analyse… (more)

Baillot, Raphaël

2011-01-01T23:59:59.000Z

483

Prsente pour obtenir le grade de docteur en gophysique de l'Institut de Physique du Globe de Paris,  

E-Print Network [OSTI]

qu'il était mon professeur à l'Université de Coimbra, a encouragé mon gout pour la télédétection et

Benzerara, Karim

484

ANALYSIS OF DWPF SLUDGE BATCH 6 (MACROBATCH 7) POUR STREAM GLASS SAMPLES  

SciTech Connect (OSTI)

The Defense Waste Processing Facility (DWPF) began processing Sludge Batch 6 (SB6), also referred to as Macrobatch 7 (MB7), in June 2010. SB6 is a blend of the heel of Tank 40 from Sludge Batch 5 (SB5), H-Canyon Np transfers and SB6 that was transferred to Tank 40 from Tank 51.1 SB6 was processed using Frit 418. Sludge is received into the DWPF Chemical Processing Cell (CPC) and is processed through the Sludge Receipt and Adjustment Tank (SRAT) and Slurry Mix Evaporator Tank (SME). The treated sludge slurry is then transferred to the Melter Feed Tank (MFT) and fed to the melter. During processing of each sludge batch, the DWPF is required to take at least one glass sample to meet the objectives of the Glass Product Control Program (GPCP) and to complete the necessary Production Records so that the final glass product may be disposed of at a Federal Repository. The DWPF requested various analyses of radioactive glass samples obtained from the melter pour stream during processing of SB6 as well as reduction/oxidation (REDOX) analysis of MFT samples to determine the impact of Argon bubbling. Sample analysis followed the Task Technical and Quality Assurance Plan (TTQAP) and an Analytical Study Plan (ASP). Four Pour Stream (PS) glass samples and two MFT slurry samples were delivered to the Savannah River National Laboratory (SRNL) from the DWPF. Table 1-1 lists the sample information for each pour stream glass sample. SB6 PS3 (S03472) was selected as the official pour stream sample for SB6 and full analysis was requested. This report details the visual observations of the as-received SB6 PS No.3 glass sample as well as results for the chemical composition, Product Consistency Test (PCT), radionuclide content, noble metals, and glass density. REDOX results will be provided for all four pour stream samples and vitrified samples of MFT-558 and MFT-568A. Where appropriate, data from other pour stream samples will be provided.

Johnson, F.

2012-01-20T23:59:59.000Z

485

Investigation of the formation of a Portland Cement plant detached plume  

SciTech Connect (OSTI)

A gaseous and particulate-source emissions sampling program was conducted at a Portland Cement production plant in Rapid City, South Dakota. The study was conducted to determine the cause of the formation of an opaque detached plume from the plants' dry process kiln. The instack opacity of the emissions was less than 10% while the opacity of the plume five to ten stack diameters from the mouth of the stack was in excess of 40%, thus giving an appearance of a detached plume. The sampling and analysis program included particulate emissions measurements, particle sizing and composition, and measurements of gaseous and particle ammonia, chloride, fluoride, and sulfur dioxide. Extensive process materials sampling and analysis were also conducted. Based on the resulting data, one conclusion is that the opaque detached plume is the result of ammonium chloride particles formed by the reaction of gaseous ammonia and hydrochloric acid. It was also found that the ammonia in the cement plant was generated from the shale portion of the raw products when the raw product was passed through the heat exchanger.

Cheney, J.L.; Knapp, K.T.

1986-05-01T23:59:59.000Z

486

Hazardous-waste combustion in industrial processes: cement and lime kilns  

SciTech Connect (OSTI)

This report summarizes the results of several studies relating to hazardous-waste combustion in cement and lime kilns. The tests included in the study are four kilns tested by the U.S. Environmental Protection Agency, four kilns tested by State agencies or the kiln operator, two Canadian tests, and one Swedish test. The predominant types of wastes tested included chlorinated organic compounds, aromatic compounds, and metal-contaminated waste oil. The kiln types include lime kilns and cement kilns, which included the dry, wet, and preheated processes. Fabric filters and electrostatic precipitators (ESPs) were the pollution-control devices used in these processes, and the primary fuels included coal, coke, coal/coke, fuel oil, and natural gas/coke. The parameters examined in the report were Destruction and Removal Efficiency (DRE) of the Principal Organic Hazardous Constitutents, particulate and HCl emissions, metals, and the effect of burning hazardous waste on SO/sub 2/, NOx, and CO emissions. The primary conclusion of the study is that DRE's of 99.99% or greater can be obtained in properly-operated calcining kilns. Particulate matter can increase when chlorinated wastes are burned in a kiln equipped with an electrostatic precipitator. Those kilns equipped with fabric filters showed no change in emissions.

Mournighan, R.E.; Branscome, M.

1987-11-01T23:59:59.000Z

487

Hydration of a low-alkali CEM III/B-SiO{sub 2} cement (LAC)  

SciTech Connect (OSTI)

The hydration of a low-alkali cement based on CEM III/B blended with 10 wt.% of nanosilica has been studied. The nanosilica reacted within the first days and 90% of the slag reacted within 3.5 years. C-S-H (Ca/Si {approx} 1.2, Al/Si {approx} 0.12), calcite, hydrotalcite, ettringite and possibly straetlingite were the main hydrates. The pore water composition revealed ten times lower alkali concentrations than in Portland cements. Reducing conditions (HS{sup -}) and a pH value of 12.2 were observed. Between 1 month and 3.5 years of hydration more hydrates were formed due to the ongoing slag reaction but no significant differences in the composition of the pore solution or solid phase assemblage were observed. On the basis of thermodynamic calculations it is predicted that siliceous hydrogarnet could form in the long-term and, in the presence of siliceous hydrogarnet, also thaumasite. Nevertheless, even after 3.5 year hydration, neither siliceous hydrogarnet nor thaumasite have been observed.

Lothenbach, Barbara, E-mail: barbara.lothenbach@empa.ch [Empa, Laboratory for Concrete and Construction Chemistry, CH-8600 Duebendorf (Switzerland); Le Saout, Gwenn; Ben Haha, Mohsen; Figi, Renato [Empa, Laboratory for Concrete and Construction Chemistry, CH-8600 Duebendorf (Switzerland); Wieland, Erich [PSI, Laboratory for Waste Management, CH-5232 Villigen PSI (Switzerland)

2012-02-15T23:59:59.000Z

488

Evaluation of water resources for enhanced oil recovery operations, Cement Field, Caddo and Grady Counties, Oklahoma  

SciTech Connect (OSTI)

This report is based on the results of an investigation of the water resources local to the Cement Oil Field in Caddo and Grady Counties, southwestern, Oklahoma. The intent of the report is to present at least a semi-quantitative estimate of the volume, deliverability, and chemistry of the water potentially available for enhanced oil recovery in one or more Oklahoma oil fields. Subsequent to a review of several oil fields, the Cement Field was chosen for study because of its large size (25,000 acres), its extensive subsurface control (over 1850 wells), and its long history of production (since 1952) from several producing formations, some of which are already undergoing extensive waterflood operations. A preliminary review of the available data for this study suggested a threefold categorization of water resources, since the data for each category are distinctly different in nature, and, to some extent, different in source. The three categories are: surface water, ground water, and subsurface water. Flow, volume, and chemical analyses of each source are estimated.

Preston, D.A.; Harrison, W.E.; Luza, K.V.; Prater, L.; Reddy, R.J.

1982-02-01T23:59:59.000Z

489

LE RGLEMENT REACH : UNE POLITIQUE EUROPENNE DE L'INCERTAIN. UN DTOUR DE RGULATION POUR LA GESTION  

E-Print Network [OSTI]

GESTION DES RISQUES CHIMIQUES Jean-Noël Jouzel et Pierre Lascoumes L'Harmattan | Politique européenne 2011-214. -------------------------------------------------------------------------------------------------------------------- Distribution électronique Cairn.info pour L'Harmattan. © L'Harmattan. Tous droits réservés pour tous pays. La.cairn.info-Institutd'EtudesPolitiquesdeParis--193.54.67.94-16/07/201410h15.©L'Harmattan Documenttéléchargédepuiswww

Paris-Sud XI, Université de

490

L'INDIFFRENCE DES FRANAIS ET DES BELGES (FRANCOPHONES) POUR LEURS VOISINS EUROPENS : UNE PICE DE PLUS AU  

E-Print Network [OSTI]

Ingelgom L'Harmattan | Politique européenne 2008/3 - n° 26 pages 143 à 164 ISSN 1623-6297 Article-164. -------------------------------------------------------------------------------------------------------------------- Distribution électronique Cairn.info pour L'Harmattan. © L'Harmattan. Tous droits réservés pour tous pays. La.cairn.info-Institutd'EtudesPolitiquesdeParis--193.54.67.94-10/07/201415h14.©L'Harmattan Documenttéléchargédepuiswww

Paris-Sud XI, Université de

491

THE MASSIVE SATELLITE POPULATION OF MILKY-WAY-SIZED GALAXIES  

SciTech Connect (OSTI)

Several occupational distributions for satellite galaxies more massive than m{sub *} Almost-Equal-To 4 Multiplication-Sign 10{sup 7} M{sub Sun} around Milky-Way (MW)-sized hosts are presented and used to predict the internal dynamics of these satellites as a function of m{sub *}. For the analysis, a large galaxy group mock catalog is constructed on the basis of (sub)halo-to-stellar mass relations fully constrained with currently available observations, namely the galaxy stellar mass function decomposed into centrals and satellites, and the two-point correlation functions at different masses. We find that 6.6% of MW-sized galaxies host two satellites in the mass range of the Small and Large Magellanic Clouds (SMC and LMC, respectively). The probabilities of the MW-sized galaxies having one satellite equal to or larger than the LMC, two satellites equal to or larger than the SMC, or three satellites equal to or larger than Sagittarius (Sgr) are Almost-Equal-To 0.26, 0.14, and 0.14, respectively. The cumulative satellite mass function of the MW, N{sub s} ({>=}m{sub *}) , down to the mass of the Fornax dwarf is within the 1{sigma} distribution of all the MW-sized galaxies. We find that MW-sized hosts with three satellites more massive than Sgr (as the MW) are among the most common cases. However, the most and second most massive satellites in these systems are smaller than the LMC and SMC by roughly 0.7 and 0.8 dex, respectively. We conclude that the distribution N{sub s} ({>=}m{sub *}) for MW-sized galaxies is quite broad, the particular case of the MW being of low frequency but not an outlier. The halo mass of MW-sized galaxies correlates only weakly with N{sub s} ({>=}m{sub *}). Then, it is not possible to accurately determine the MW halo mass by means of its N{sub s} ({>=}m{sub *}); from our catalog, we constrain a lower limit of 1.38 Multiplication-Sign 10{sup 12} M{sub Sun} at the 1{sigma} level. Our analysis strongly suggests that the abundance of massive subhalos should agree with the abundance of massive satellites in all MW-sized hosts, i.e., there is not a missing (massive) satellite problem for the {Lambda}CDM cosmology. However, we confirm that the maximum circular velocity, v{sub max}, of the subhalos of satellites smaller than m{sub *} {approx} 10{sup 8} M{sub Sun} is systematically larger than the v{sub max} inferred from current observational studies of the MW bright dwarf satellites; different from previous works, this conclusion is based on an analysis of the overall population of MW-sized galaxies. Some pieces of evidence suggest that the issue could refer only to satellite dwarfs but not to central dwarfs, then environmental processes associated with dwarfs inside host halos combined with supernova-driven core expansion should be on the basis of the lowering of v{sub max}.

Rodriguez-Puebla, Aldo; Avila-Reese, Vladimir; Drory, Niv, E-mail: apuebla@astro.unam.mx [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, A. P. 70-264, 04510 Mexico, DF (Mexico)

2013-08-20T23:59:59.000Z

492

Nuclear shell-model code for massive parallel computation, "KSHELL"  

E-Print Network [OSTI]

A new code for nuclear shell-model calculations, "KSHELL", is developed. It aims at carrying out both massively parallel computation and single-node computation in the same manner. We solve the Schr\\"{o}dinger's equation in the $M$-scheme shell-model model space, utilizing Thick-Restart Lanczos method. During the Lanczos iteration, the whole Hamiltonian matrix elements are generated "on-the-fly" in every matrix-vector multiplication. The vectors of the Lanczos method are distributed and stored on memory of each parallel node. We report that the newly developed code has high parallel efficiency on FX10 supercomputer and a PC with multi-cores.

Noritaka Shimizu

2013-10-21T23:59:59.000Z

493

Effective Fluid FLRW Cosmologies of Minimal Massive Gravity  

E-Print Network [OSTI]

By using a solution ansatz we partially decouple the metric and the Stuckelberg sectors of the minimal massive gravity (MMGR). In this scheme for a diagonal physical metric we find the general solutions for the scalars of the theory and the particular fiducial (background) metric which leads to these solutions. Then we adopt this general formalism to construct the derivation of new FLRW cosmologies of the theory in the presence of a so-called effective ideal fluid which arises from our solution ansatz as a modifying, non-physical source for the Einstein and the corresponding Friedmann equations.

Nejat Tevfik Yilmaz

2014-09-23T23:59:59.000Z

494

Translation invariant time-dependent massive gravity: Hamiltonian analysis  

E-Print Network [OSTI]

The canonical structure of the massive gravity in the first order moving frame formalism is studied. We work in the simplified context of translation invariant fields, with mass terms given by general non-derivative interactions, invariant under the diagonal Lorentz group, depending on the moving frame as well as a fixed reference frame. We prove that the only mass terms which give 5 propagating degrees of freedom are the dRGT mass terms, namely those which are linear in the lapse. We also complete the Hamiltonian analysis with the dynamical evolution of the system.

Jihad Mourad; Karim Noui; Danièle A. Steer

2014-07-10T23:59:59.000Z

495

Stability of the self-accelerating universe in massive gravity  

SciTech Connect (OSTI)

We study linear perturbations around time dependent spherically symmetric solutions in the ?{sub 3} massive gravity theory, which self-accelerate in the vacuum. We find that the dynamics of the scalar perturbations depend on the choice of the fiducial metric for the background solutions. For particular choice of fiducial metric there is a symmetry enhancement, leaving no propagating scalar degrees of freedom at linear order in perturbations. In contrast, any other choice propagates a single scalar mode. We find that the Hamiltonian of this scalar mode is unbounded from below for all self-accelerating solutions, signalling an instability.

Khosravi, Nima [Cosmology Group, African Institute for Mathematical Sciences, Muizenberg, 7945 (South Africa); Niz, Gustavo; Koyama, Kazuya; Tasinato, Gianmassimo, E-mail: nima@aims.ac.za, E-mail: g.niz@ugto.mx, E-mail: Kazuya.Koyama@port.ac.uk, E-mail: gianmassimo.tasinato@port.ac.uk [Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX (United Kingdom)

2013-08-01T23:59:59.000Z

496

Anisotropic massive strings in scalar-tensor theory of gravitation  

E-Print Network [OSTI]

We present the model of anisotropic universe with string fluid as source of matter within the framework of scalar-tensor theory of gravitation. Exact solution of field equations are obtained by applying Berman's law of variation of Hubble's parameter which yields a constant value of DP. The nature of classical potential is examined for the model under consideration. It has been also found that the massive strings dominate in early universe and at long last disappear from universe. This is in agreement with current astronomical observations. The physical and dynamical properties of model are also discussed.

Anil Kumar Yadav

2012-11-15T23:59:59.000Z

497

Solar-like oscillations in a massive star  

E-Print Network [OSTI]

Seismology of stars provides insight into the physical mechanisms taking place in their interior, with modes of oscillation probing different layers. Low-amplitude acoustic oscillations excited by turbulent convection were detected four decades ago in the Sun and more recently in low-mass main-sequence stars. Using data gathered by the Convection Rotation and Planetary Transits mission, we report here on the detection of solar-like oscillations in a massive star, V1449 Aql, which is a known large-amplitude (b Cephei) pulsator.

Belkacem, K; Goupil, M -J; Lefèvre, L; Baudin, F; Deheuvels, S; Dupret, M -A; Appourchaux, T; Scuflaire, R; Auvergne, M; Catala, C; Michel, E; Miglio, A; Montalban, J; Thoul, A; Talon, S; Baglin, A; Noels, A

2009-01-01T23:59:59.000Z

498

Massive zero-metal stars: Energy production and mixing  

E-Print Network [OSTI]

Time-dependent nuclear network calculations at constant temperature show that for zero-metal stars >= 20 Msun (i) beta-decay reactions and (ii) the 13N(p,gamma)14O reaction must be included. It is also shown that the nuclear timescale in these zero-metal stars is shorter than the mixing timescale and therefore the assumption of instantaneous mixing across convective regions is not fulfilled. We conclude that proper modeling of these processes may alter the evolution of massive zero-metal stars.

C. W. Straka; W. M. Tscharnuter

2001-03-21T23:59:59.000Z

499

On the new massive gravity and AdS/CFT  

E-Print Network [OSTI]

Demanding the existence of a simple holographic $c$-theorem, it is shown that a general (parity preserving) theory of gravity in 2+1 dimensions involving upto four derivative curvature invariants reduces to the new massive gravity theory. We consider extending the theory including upto six derivative curvature invariants. Black hole solutions are presented and consistency with 1+1 CFTs is checked. We present evidence that bulk unitarity is still in conflict with a positive CFT central charge for generic choice of parameters. However, for a special choice of parameters appearing in the four and six derivative terms reduces the linearized equations to be two derivative, thereby ameliorating the unitarity problem.

Aninda Sinha

2010-08-11T23:59:59.000Z

500

Routing performance analysis and optimization within a massively parallel computer  

DOE Patents [OSTI]

An apparatus, program product and method optimize the operation of a massively parallel computer system by, in part, receiving actual performance data concerning an application executed by the plurality of interconnected nodes, and analyzing the actual performance data to identify an actual performance pattern. A desired performance pattern may be determined for the application, and an algorithm may be selected from among a plurality of algorithms stored within a memory, the algorithm being configured to achieve the desired performance pattern based on the actual performance data.

Archer, Charles Jens; Peters, Amanda; Pinnow, Kurt Walter; Swartz, Brent Allen

2013-04-16T23:59:59.000Z