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1

Electroless deposition process for zirconium and zirconium alloys  

DOEpatents

A method is disclosed for preventing stress corrosion cracking or metal embrittlement of a zirconium or zirconium alloy container that is to be coated on the inside surface with a layer of a metal such as copper, a copper alloy, nickel, or iron and used for holding nuclear fuel material as a nuclear fuel element. The zirconium material is etched in an etchant solution, desmutted mechanically or ultrasonically, oxidized to form an oxide coating on the zirconium, cleaned in an aqueous alkaline cleaning solution, activated for electroless deposition of a metal layer and contacted with an electroless metal plating solution. This method provides a boundary layer of zirconium oxide between the zirconium container and the metal layer.

Donaghy, Robert E. (Wilmington, NC); Sherman, Anna H. (Wilmington, NC)

1981-01-01

2

Electroless deposition process for zirconium and zirconium alloys  

DOEpatents

A method is disclosed for preventing stress corrosion cracking or metal embrittlement of a zirconium or zirconium alloy container that is to be coated on the inside surface with a layer of a metal such as copper, a copper alloy, nickel, or iron and used for holding nuclear fuel material as a nuclear fuel element. The zirconium material is etched in an etchant solution, desmutted mechanically or ultrasonically, oxidized to form an oxide coating on the zirconium, cleaned in an aqueous alkaline cleaning solution, activated for electroless deposition of a metal layer and contacted with an electroless metal plating solution. This method provides a boundary layer of zirconium oxide between the zirconium container and the metal layer. 1 fig.

Donaghy, R. E.; Sherman, A. H.

1981-08-18

3

Organic derivatives of zirconium phosphate  

E-print Network

zirconium phosphate as for n zirconium phosphate, The unit cell dimensions were determined by electron diffraction to be a = 5. 376 + 0. 002 A, b 6 . 636 + 0 . 004 A, c = 24 . 56 + 0 . 01 X, and 0 8 = 93. 94 + 0. 05' [9] . The interlayer spacing is 12. 3... of ethylene oxide on the fact that it esterifies phosphoric acid. He placed 0. 3 g samples of Y-zirconium phosphate into glass tubes with 40 ml of ethylene oxide solutions ranging in concentration from 0. 5 M to 5 M. These mixtures were shaken for varying...

Fine, Steven Beryl

2012-06-07

4

Complexometric determination of aluminium, zirconium, and hafnium  

Microsoft Academic Search

Methods for the complexometric titration of aluminium, zirconium and hafnium are described using pyrocatechol violet as indicator. The EDTA titration of zirconium and hafnium is performed in acid medium and that of aluminium in a solution buffered with acetate.

I. Hazan; F. Feik; J. Korkisch

1965-01-01

5

Transformation superplasticity of zirconium  

SciTech Connect

A tensile strain of 270% was achieved for coarse-grained zirconium subjected to transformation superplasticity condition, where strain increments are accumulated upon repeated thermal cycling around the allotropic transformation temperature under the biasing effect of a uniaxial tensile stress. The strain increment per cycle was found to consist of two equal contributions from transformations on heating and cooling and to increase linearly with the applied stress. The measured strain increments are in good quantitative agreement with predictions based on the average internal stress during the transformation, which was determined independently from experimental transformation times. As the cycling frequency is raised, the average strain rate increases (a maximum value of 1.3 {times} 10{sup {minus}4} s{sup {minus}1} was measured), but the strain increment per cycle decreases above a critical cycling frequency, for which the sample gage section undergoes only a partial phase transformation. The resulting reduction in internal mismatch and increase in internal stress are modeled using the experimental observation that {beta}-Zr deforms by a mixture of diffusional and dislocation creep in the stress range of interest.

Zwigl, P. [Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Materials Science and Engineering; Dunand, D.C. [Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering

1998-10-01

6

Ablation Resistant Zirconium and Hafnium Ceramics  

NASA Technical Reports Server (NTRS)

High temperature ablation resistant ceramic composites have been made. These ceramics are composites of zirconium diboride and zirconium carbide with silicon carbide, hafnium diboride and hafnium carbide with silicon carbide and ceramic composites which contain mixed diborides and/or carbides of zirconium and hafnium. along with silicon carbide.

Bull, Jeffrey (Inventor); White, Michael J. (Inventor); Kaufman, Larry (Inventor)

1998-01-01

7

ZIRCONIUM AND HAFNIUM--1999 86.1 ZIRCONIUM AND HAFNIUM  

E-print Network

of the mining and processing of heavy-mineral sands for the titanium minerals, ilmenite and rutile, or tin to produce cubic zirconia, a diamond and colored gemstone simulant. Zirconium is used in nuclear fuel as a recently opened mining operation in Virginia continued to scale-up production. In 1999, production

8

ZIRCONIUM AND HAFNIUM--2001 86.1 ZIRCONIUM AND HAFNIUM  

E-print Network

are contained in zircon at a ratio of about 50:1. Zircon is a coproduct or byproduct of the mining is processed to produce cubic zirconia, a diamond and colored gemstone simulant. Zirconium metal is used of domestic operations. In 2001, the two domestic zircon producers, which have three mining and processing

9

ZIRCONIUM AND HAFNIUM--1998 86.1 ZIRCONIUM AND HAFNIUM  

E-print Network

of the mining and processing of heavy-mineral sands for the titanium minerals, ilmenite and rutile, or tin the diamond simulant, cubic zirconia. Zirconium is used in nuclear fuel cladding, chemical piping in corrosive. Domestic production of zircon increased as a new mine in Virginia came online. Production of milled zircon

10

Morphologies of uranium and uranium zirconium electrodeposits  

NASA Astrophysics Data System (ADS)

Uranium and uranium-zirconium electrodeposits produced in the Fuel Cycle Facility at Argonne National Laboratory-West were examined using standard metallurgical techniques. Substantial differences in the morphologies of the two types of deposits were observed. Samples from pure uranium deposits were comprised of chains of uranium crystals with a characteristic rhomboidal shape, while the morphologies of samples from deposits containing zirconium in excess of approximately 0.5 wt% showed more polycrystalline features. Zirconium was found to be present as a second, zirconium metal phase at or very near the uranium-zirconium dendrite surfaces. Higher collection efficiencies and total deposit weights were observed for the uranium-zirconium deposits; this performance increase is likely a result of better mechanical properties exhibited by the uranium-zirconium dendrite morphology.

Totemeier, Terry C.; Mariani, Robert D.

1997-12-01

11

Electrochemical process for zirconium alloy recycling  

SciTech Connect

This patent describes a method of separating nickel from zirconium for recycling nickel-containing zirconium alloy. It comprises: placing the nickel-containing zirconium in a molten alt bath at 500{degrees} to about 722{degrees} C. with the molten salt in the molten salt bath consisting essentially of a mixture of 0 to about 46.5 mole % lithium fluoride, about 11.5 to about 40 mole % sodium fluoride and potassium fluoride to produce a molten salt bath containing dissolved zirconium and dissolved nickel; electrochemically plating the nickel from the molten salt bath at a voltage sufficient to plate nickel but less than the voltage to plate zirconium to provide an essentially nickel-free molten salt bath; and electrochemically plating the zirconium from the essentially nickel-free molten salt bath to provide an essentially nickel-free zirconium.

Snyder, T.S.; Stoltz, R.A.; Zuckerbrod, D.

1990-05-08

12

Spectrophotometric titration of zirconium in siliceous materials.  

PubMed

An accurate and selective complexometric titration procedure based upon a spectrophotometrically detected end-point has been developed for the determination of zirconium in glasses, glass-ceramics and refractories. A p-bromomandelic acid separation step for zirconium imparts excellent selectivity to the procedure. The method is particularly important for the 1-5% concentration range where a simple, accurate and selective method for the determination of zirconium has been lacking. PMID:18962344

Sugawara, K F; Su, Y S; Strzegowski, W R

13

Synthesis and formation process of zirconium dioxide nanorods  

NASA Astrophysics Data System (ADS)

Crystalline zirconium dioxide nanorods have been prepared by a simple hydrothermal process using zirconium hydroxide as the zirconium raw material. Zirconium dioxide nanorods are composed of monoclinic zirconium dioxide phase, which has been confirmed by the X-ray diffraction analysis. Electron microscopy observations show that the zirconium dioxide nanorods have a single crystal structure, with the rod diameter of less than 100 nm and length of 1-2 ?m. Hydrothermal temperature and reaction time play essential roles in the formation and growth of the zirconium dioxide nanorods. Nucleation and crystal growth process are proposed to explain the formation and growth of the zirconium dioxide nanorods.

Pei, L. Z.; Xie, Y. K.; Pei, Y. Q.; Yuan, C. Z.

2013-04-01

14

Method of making crack-free zirconium hydride  

DOEpatents

Crack-free hydrides of zirconium and zirconium-uranium alloys are produced by alloying the zirconium or zirconium-uranium alloy with beryllium, or nickel, or beryllium and scandium, or nickel and scandium, or beryllium and nickel, or beryllium, nickel and scandium and thereafter hydriding.

Sullivan, Richard W. (Denver, CO)

1980-01-01

15

Thermodynamics of the uranium-zirconium system  

NASA Astrophysics Data System (ADS)

Renewed interest in metallic fuel for nuclear reactors has prompted new studies of the thermodynamics and phase equilibria in binary alloys containing uranium, plutonium, and zirconium so that the ternary phase diagram might be calculated. An analysis of the uranium-zirconium alloy system has been performed. Thermodynamic functions for all existing uranium-zirconium phases have been derived and a phase diagram was calculated. These results are compared with the available thermodynamic data and accepted phase diagrams and general agreement was found. Disagreements generally occurred where experimental data were sparse and when previously drawn phase boundaries were found to be inconsistent with theory.

Leibowitz, L.; Blomquist, R. A.; Pelton, A. D.

1989-09-01

16

Hipparcos Venice 97 Symposium  

NASA Astrophysics Data System (ADS)

Carried into orbit by an Ariane 4 launcher in 1989, ESA's astrometric satellite Hipparcos monitored 118,218 stars during a period of four years taking the first accurate census of the stars that populate our galaxy. The measurements, precise to one millionth of a degree - a hundred time more precise than equivalent measurements taken by the most sophisticated ground-based observatories- are collected in a catalogue (the Hipparcos Catalogue) to be available to the international community of scientist in June this year. A second catalogue (the Tycho Catalogue) gives positions and proper motions of 1,038,332 stars with a precision of one hundred thousandth of a degree. The Hipparcos Symposium in Venice will mark the completion of the Hipparcos and Tycho Catalogues and will also be the first occasion at which the scientific results arising from the mission will be presented and discussed. Co-sponsored by Matra Marconi Space and Alenia Spazio, the industrial architects of the Hipparcos spacecraft, this symposium will be held at Fondazione Cini, on the Island of S. Giorgio, under the auspices of the City of Venice. A daily summary of the Symposium works will be available as of 13 May on Internet at the following URL: http://www.estec.esa.nl/spdwww/hipparcos/V97/ or under the What's New section of ESA's Science pages on the web at http://www.estec.esa.nl/spdwww/h2000/html/whatsnew.htm An open air exhibition on Riva Ca' di Dio, a Venetian quay near the Piazza San Marco, open 1-25 May 1997, echoes the Symposium and catches the attention of the public at large with full size models of the Hipparcos, ISO and SOHO scientific satellites: advanced space science amidst Venetian palaces, history and art.

1997-04-01

17

ZIRCONIUM OXIDE NANOSTRUCTURES PREPARED BY ANODIC OXIDATION  

SciTech Connect

Zirconium oxide is an advanced ceramic material highly useful for structural and electrical applications because of its high strength, fracture toughness, chemical and thermal stability, and biocompatibility. If highly-ordered porous zirconium oxide membranes can be successfully formed, this will expand its real-world applications, such as further enhancing solid-oxide fuel cell technology. Recent studies have achieved various morphologies of porous zirconium oxide via anodization, but they have yet to create a porous layer where nanoholes are formed in a highly ordered array. In this study, electrochemical methods were used for zirconium oxide synthesis due to its advantages over other coating techniques, and because the thickness and morphology of the ceramic fi lms can be easily tuned by the electrochemical parameters, such as electrolyte solutions and processing conditions, such as pH, voltage, and duration. The effects of additional steps such as pre-annealing and post-annealing were also examined. Results demonstrate the formation of anodic porous zirconium oxide with diverse morphologies, such as sponge-like layers, porous arrays with nanoholes ranging from 40 to 75 nm, and nanotube layers. X-ray powder diffraction analysis indicates a cubic crystallographic structure in the zirconium oxide. It was noted that increased voltage improved the ability of the membrane to stay adhered to the zirconium substrate, whereas lower voltages caused a propensity for the oxide fi lm to fl ake off. Further studies are needed to defi ne the parameters windows that create these morphologies and to investigate other important characteristics such as ionic conductivity.

Dang, Y. Y.; Bhuiyan, M.S.; Paranthaman, M. P.

2008-01-01

18

Synthesis of zirconium oxide nanoparticle by sol-gel technique  

SciTech Connect

Zirconium oxide nanoparticle is synthesized using sol-gel technique. Various mole ratio of ammonia solution and nitric acid relative to zirconium propoxide is added in the reaction to study the effect on the crystallinity and particle size on zirconium oxide particle. Zirconium oxide synthesized with nitric acid have the smallest particle size under FESEM image and show the increasing formation of crystalline tetragonal phase under XRD diffractogram.

Lim, H. S.; Ahmad, A.; Hamzah, H. [School of Chemical Science and Food Technology, Faculty of Science and Technology, National University of Malaysia, 43600 Bangi (Malaysia)

2013-11-27

19

Low-cycle fatigue of cold-press-welded zirconium  

Microsoft Academic Search

The behavior of cold-press welding as regards low-cycle fatigue on ; zirconium- zirconium joints was examined. Alternating torsion tests were carried ; out with constant strain amplitudes at room temperature on butt-welded and ; nonwelded zirconium samples (reactor-grade, annealed). During the tests, the ; torsional moment and the change in sample length were continually recorded. The ; lifetime until rupture

K. T. Rie; J. Ruge

1973-01-01

20

Processing fissile material mixtures containing zirconium and/or carbon  

DOEpatents

A method of processing spent TRIZO-coated nuclear fuel may include adding fluoride to complex zirconium present in a dissolved TRIZO-coated fuel. Complexing the zirconium with fluoride may reduce or eliminate the potential for zirconium to interfere with the extraction of uranium and/or transuranics from fission materials in the spent nuclear fuel.

Johnson, Michael Ernest; Maloney, Martin David

2013-07-02

21

HP Laboratories 5/22/97 Hiro:Documents:Giordano Beretta:Research:AIC97:aic97ohp.doc  

E-print Network

w w w HP Laboratories 5/22/97 Hiro:Documents:Giordano Beretta:Research:AIC97:aic97ohp.doc 0Encoding://www.hpl.hp.com/personal/Giordano_Beretta #12;w w w HP Laboratories 5/22/97 Hiro:Documents:Giordano Beretta:Research:AIC97:aic97ohp.doc 1The · the reader decides the appearance · Today the W3 is a hot publication medium · authors want control over

Beretta, Giordano

22

Review of zirconium-zircaloy pyrophoricity  

SciTech Connect

Massive zirconium metal scrap can be handled, shipped, and stored with no evidence of combustion or pyrophoricity hazards. Mechanically produced fine scrap such as shavings, turnings, or powders can burn but are not pyrophoric unless the particle diameter is less than 54 ..mu..m. Powders with particle diameters less than 54 ..mu..m can be both pyrophoric and explosive. Pyrophoric powders should be collected and stored underwater or under inert gas cover to reduce the flammability hazard. Opening sealed containers of zirconium stored underwater should be attempted with caution since hydrogen may be present. The factors that influence the ignition temperature have been explored in depth and recommendations are included for the safe handling, shipping, and storage of pyrophoric or flammable zirconium. 29 refs., 5 figs., 6 tabs.

Cooper, T.D.

1984-11-01

23

47 CFR 97.217 - Telemetry.  

Code of Federal Regulations, 2011 CFR

...Telecommunication 5 2011-10-01 2011-10-01 false Telemetry. 97.217 Section 97.217 Telecommunication...RADIO SERVICE Special Operations 97.217 Telemetry. Telemetry transmitted by an amateur station on or...

2011-10-01

24

47 CFR 97.217 - Telemetry.  

Code of Federal Regulations, 2012 CFR

...Telecommunication 5 2012-10-01 2012-10-01 false Telemetry. 97.217 Section 97.217 Telecommunication...RADIO SERVICE Special Operations 97.217 Telemetry. Telemetry transmitted by an amateur station on or...

2012-10-01

25

47 CFR 97.217 - Telemetry.  

Code of Federal Regulations, 2013 CFR

...Telecommunication 5 2013-10-01 2013-10-01 false Telemetry. 97.217 Section 97.217 Telecommunication...RADIO SERVICE Special Operations 97.217 Telemetry. Telemetry transmitted by an amateur station on or...

2013-10-01

26

47 CFR 97.217 - Telemetry.  

Code of Federal Regulations, 2010 CFR

...Telecommunication 5 2010-10-01 2010-10-01 false Telemetry. 97.217 Section 97.217 Telecommunication...RADIO SERVICE Special Operations 97.217 Telemetry. Telemetry transmitted by an amateur station on or...

2010-10-01

27

ZIRCONIUM AND HAFNIUM (Data in metric tons of zirconium oxide (ZrO ) equivalent, unless otherwise noted)2  

E-print Network

194 ZIRCONIUM AND HAFNIUM (Data in metric tons of zirconium oxide (ZrO ) equivalent, unless, and sandblasting. The largest market for hafnium metal is an addition in superalloys. Salient Statistics) 837 884 836 929 1,4002 Zirconium oxide (ZrO content) 2,400 4,370 5,240 4,220 4,0002 2 Hafnium

28

Snapshot '97: 1996-97 School District Profiles.  

ERIC Educational Resources Information Center

"Snapshot '97," the 10th edition of this publication, provides information about students, student performance, staffing, and the financing of Texas public school districts. This annual summary is a useful source of information for anyone interested in the demographics of Texas schools, the resources available, and the improvements that have been

Texas Education Agency, Austin. Office of Policy Planning and Research.

29

Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 1  

E-print Network

Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 1 CTD096 #12;Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 2 CTD096 #12;Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 3 CTD096 #12;Hickey, TT136, casts 96-97 Hickey, TT136, casts 96-97, page 4 CTD096 #12;Hickey, TT136

Hickey, Barbara

30

Zirconium Alloys in Nuclear Power Plants  

Microsoft Academic Search

The use of zirconium alloys for nuclear fuel and reactor internals in nuclear reactors is reviewed, with special attention to the mechanisms that can limit fuel burnup extensions in light water reactors, such as corrosion and hydriding and irradiation growth and creep. Recent techniques for studying these processes open the possibility that they can be understood mechanistically such that alloys

A. T. Motta

31

Zirconium and hafnium in meteorites  

NASA Astrophysics Data System (ADS)

The ratio of the two refractory trace elements zirconium (Zr) and hafnium (Hf) in meteorites has been proposed to be uniform. The most precise value available is 34.3+/-0.2 (1?). It was obtained by isotope dilution ICP-MS applied to 15 chondrites, most of which were carbonaceous chondrites, and six achondrites. We reinvestigated the case and determined Zr/Hf ratios of a broad spectrum of meteoritic samples via laser ablation ICP-MS. Our sample suite comprised 29 chondrites and five achondrites. The main objective of the study was two-fold: we intended to verify the accuracy and precision of a relatively fast and inexpensive sample preparation method combined with expeditious laser ablation ICP-MS techniques. Furthermore, we were looking into the possibility of systematic fine-scale Zr/Hf variations among bulk meteoritic matter of different classes. The applied fusion technique together with laser ablation ICP-MS turned out to be well suited to determine relative refractory trace element abundances. Absolute Zr/Hf ratios yield uncertainties of approximately 4% (1?). As opposed to the most recent findings, we observed variable Zr/Hf ratios in different meteorites ranging from approximately 28 to approximately 38. Our value for Orgueil (CI1) is 34.0+/-0.3 (1?). Including literature data, we propose a solar system value of 34.1+/-0.3. Our data also suggest that H chondrites tend to exhibit higher Zr/Hf ratios (average of 35.6+/-0.5 [1?]) while EL6 chondrites rather show low values (average of 30.8+/-0.6 [1?]). In addition to examining Zr/Hf ratios, we also explored the content of refractory major elements in different meteorite groups. Here, we found that EL6 chondrites often show very low Ca/Al ratios. The CI1 value for CaO/Al2O3 is 0.804. EL6 chondrites, however, display ratios as low as approximately 0.3. While the variation in Zr/Hf can be explained by fractional condensation processes in the early solar nebula, the observed low Ca/Al ratios in EL6 chondrites are probably attributable to deficits in oldhamite (CaS).

Patzer, Andrea; Pack, Andreas; Gerdes, Axel

2010-07-01

32

40 CFR 421.330 - Applicability: Description of the primary zirconium and hafnium subcategory.  

Code of Federal Regulations, 2012 CFR

...Applicability: Description of the primary zirconium and hafnium subcategory...NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY Primary Zirconium and Hafnium Subcategory...Applicability: Description of the primary zirconium and hafnium...

2012-07-01

33

40 CFR 421.330 - Applicability: Description of the primary zirconium and hafnium subcategory.  

Code of Federal Regulations, 2011 CFR

...Applicability: Description of the primary zirconium and hafnium subcategory...NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY Primary Zirconium and Hafnium Subcategory...Applicability: Description of the primary zirconium and hafnium...

2011-07-01

34

40 CFR 421.330 - Applicability: Description of the primary zirconium and hafnium subcategory.  

Code of Federal Regulations, 2010 CFR

...Applicability: Description of the primary zirconium and hafnium subcategory...NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY Primary Zirconium and Hafnium Subcategory...Applicability: Description of the primary zirconium and hafnium...

2010-07-01

35

40 CFR 421.330 - Applicability: Description of the primary zirconium and hafnium subcategory.  

Code of Federal Regulations, 2013 CFR

...Applicability: Description of the primary zirconium and hafnium subcategory...NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY Primary Zirconium and Hafnium Subcategory...Applicability: Description of the primary zirconium and hafnium...

2013-07-01

36

40 CFR 721.10089 - Modified salicylic acid, zirconium complex (generic).  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Modified salicylic acid, zirconium complex (generic...Substances 721.10089 Modified salicylic acid, zirconium complex (generic...identified generically as modified salicylic acid, zirconium complex (PMN...

2010-07-01

37

40 CFR 721.10089 - Modified salicylic acid, zirconium complex (generic).  

...2014-07-01 false Modified salicylic acid, zirconium complex (generic...Substances 721.10089 Modified salicylic acid, zirconium complex (generic...identified generically as modified salicylic acid, zirconium complex (PMN...

2014-07-01

38

40 CFR 721.10089 - Modified salicylic acid, zirconium complex (generic).  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Modified salicylic acid, zirconium complex (generic...Substances 721.10089 Modified salicylic acid, zirconium complex (generic...identified generically as modified salicylic acid, zirconium complex (PMN...

2012-07-01

39

40 CFR 721.10089 - Modified salicylic acid, zirconium complex (generic).  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Modified salicylic acid, zirconium complex (generic...Substances 721.10089 Modified salicylic acid, zirconium complex (generic...identified generically as modified salicylic acid, zirconium complex (PMN...

2013-07-01

40

40 CFR 721.10089 - Modified salicylic acid, zirconium complex (generic).  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Modified salicylic acid, zirconium complex (generic...Substances 721.10089 Modified salicylic acid, zirconium complex (generic...identified generically as modified salicylic acid, zirconium complex (PMN...

2011-07-01

41

Manufacturing process to reduce large grain growth in zirconium alloys  

DOEpatents

It is an object of the present invention to provide a procedure for desensitizing zirconium-based alloys to large grain growth (LGG) during thermal treatment above the recrystallization temperature of the alloy. It is a further object of the present invention to provide a method for treating zirconium-based alloys which have been cold-worked in the range of 2 to 8% strain to reduce large grain growth. It is another object of the present invention to provide a method for fabricating a zirconium alloy clad nuclear fuel element wherein the zirconium clad is resistant to large grain growth.

Rosecrans, P.M.

1984-08-01

42

Effects of titanium and zirconium on iron aluminide weldments  

SciTech Connect

When gas-tungsten arc welded, iron aluminides form a coarse fusion zone microstructure which is susceptible to hydrogen embrittlement. Titanium inoculation effectively refined the fusion zone microstructure in iron aluminide weldments, but the inoculated weldments had a reduced fracture strength despite the presence of a finer microstructure. The weldments fractured by transgranular cleavage which nucleated at cracked second phase particles. With titanium inoculation, second phase particles in the fusion zone changed shape and also became more concentrated at the grain boundaries, which increased the particle spacing in the fusion zone. The observed decrease in fracture strength with titanium inoculation was attributed to increased spacing of second phase particles in the fusion zone. Current research has focused on the weldability of zirconium- and carbon-alloyed iron aluminides. Preliminary work performed at Oak Ridge National Laboratory has shown that zirconium and carbon additions affect the weldability of the alloy as well as the mechanical properties and fracture behavior of the weldments. A sigmajig hot cracking test apparatus has been constructed and tested at Colorado School of Mines. Preliminary characterization of hot cracking of three zirconium- and carbon-alloyed iron aluminides, each containing a different total concentration of zirconium at a constant zirconium/carbon ratio of ten, is in progress. Future testing will include low zirconium alloys at zirconium/carbon ratios of five and one, as well as high zirconium alloys (1.5 to 2.0 atomic percent) at zirconium/carbon ratios of ten to forty.

Mulac, B.L.; Edwards, G.R. [Colorado School of Mines, Golden, CO (United States). Center for Welding, Joining, and Coatings Research; Burt, R.P. [Alumax Technical Center, Golden, CO (United States); David, S.A. [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

1997-12-01

43

Zirconium induced physiological alterations in wheat seedlings  

Microsoft Academic Search

The effects of zirconium ascorbate (Zr-ASC), a water-soluble complex of Zr, were examined on wheat seedlings (Triticum aestivum L. cv. MV. 20). Hydroponically grown plants were exposed to 10, 33, 55, 100 and 550 M Zr-ASC (Zr10, Zr33etc.). After 9 d of treatment inhibition of germination, retarded root and shoot growth, and increased activities of antioxidant enzymes (guaiacol peroxidase, ascorbate

M. Fodor; A. Hegedus; E. Stefanovits-Banyai

2005-01-01

44

STS-97 Post Flight Presentation  

NASA Technical Reports Server (NTRS)

Various shots highlight the STS-97 Endeavour mission. Footage shows the crew suiting up and leaving the Operations and Checkout (O&C) Building, the launch, and landing. Various on-orbit activities are seen, such as docking with the International Space Station (ISS), the spacewalks (installing the PV Module P6), array deployment, meeting the Expedition 1 crew, eating, and undocking. Shots show the northern lights and a meteorite entering Earth's atmosphere from above. The Andes can be seen from the Orbiter while the P6 arrays are deploying.

2001-01-01

45

Fluorometric determination of zirconium in minerals  

USGS Publications Warehouse

The increasing use of zirconium in alloys and in the ceramics industry has created renewed interest in methods for its determination. It is a common constituent of many minerals, but is usually present in very small amounts. Published methods tend to be tedious, time-consuming, and uncertain as to accuracy. A new fluorometric procedure, which overcomes these objections to a large extent, is based on the blue fluorescence given by zirconium and flavonol in sulfuric acid solution. Hafnium is the only element that interferes. The sample is fused with borax glass and sodium carbonate and extracted with water. The residue is dissolved in sulfuric acid, made alkaline with sodium hydroxide to separate aluminum, and filtered. The precipitate is dissolved in sulfuric acid and electrolysed in a Melaven cell to remove iron. Flavonol is then added and the fluorescence intensity is measured with a photo-fluorometer. Analysis of seven standard mineral samples shows excellent results. The method is especially useful for minerals containing less than 0.25% zirconium oxide.

Alford, W.C.; Shapiro, L.; White, C.E.

1951-01-01

46

Science and Engineering Degrees: 1966-97  

NSF Publications Database

... Degrees: 1966-97 Detailed Statistical Tables Hypertext Format Science and Engineering Degrees ... Format (.pdf) Science and Engineering Degrees: 1966-97 This report is available in hypertext (.htm ...

47

46 CFR 111.97-1 - Applicability.  

Code of Federal Regulations, 2011 CFR

...111.97-1 Section 111.97-1 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems ...

2011-10-01

48

46 CFR 111.97-1 - Applicability.  

Code of Federal Regulations, 2012 CFR

...111.97-1 Section 111.97-1 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems ...

2012-10-01

49

29 CFR 452.97 - Secret ballot.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Secret ballot. 452.97 Section 452.97...Procedures; Rights of Members 452.97 Secret ballot. (a) A prime requisite of...regulated by title IV is that they be held by secret ballot among the members or in...

2010-07-01

50

29 CFR 452.97 - Secret ballot.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Secret ballot. 452.97 Section 452.97...Procedures; Rights of Members 452.97 Secret ballot. (a) A prime requisite of...regulated by title IV is that they be held by secret ballot among the members or in...

2013-07-01

51

29 CFR 452.97 - Secret ballot.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Secret ballot. 452.97 Section 452.97...Procedures; Rights of Members 452.97 Secret ballot. (a) A prime requisite of...regulated by title IV is that they be held by secret ballot among the members or in...

2011-07-01

52

29 CFR 452.97 - Secret ballot.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Secret ballot. 452.97 Section 452.97...Procedures; Rights of Members 452.97 Secret ballot. (a) A prime requisite of...regulated by title IV is that they be held by secret ballot among the members or in...

2012-07-01

53

46 CFR 97.15-10 - Sanitation.  

Code of Federal Regulations, 2012 CFR

... Shipping 4 2012-10-01 2012-10-01 false Sanitation. 97.15-10 Section 97.15-10 Shipping COAST...OPERATIONS Tests, Drills, and Inspections 97.15-10 Sanitation. (a) It shall be the duty of the master and chief...

2012-10-01

54

46 CFR 97.15-10 - Sanitation.  

Code of Federal Regulations, 2010 CFR

... Shipping 4 2010-10-01 2010-10-01 false Sanitation. 97.15-10 Section 97.15-10 Shipping COAST...OPERATIONS Tests, Drills, and Inspections 97.15-10 Sanitation. (a) It shall be the duty of the master and chief...

2010-10-01

55

46 CFR 97.15-10 - Sanitation.  

Code of Federal Regulations, 2013 CFR

... Shipping 4 2013-10-01 2013-10-01 false Sanitation. 97.15-10 Section 97.15-10 Shipping COAST...OPERATIONS Tests, Drills, and Inspections 97.15-10 Sanitation. (a) It shall be the duty of the master and chief...

2013-10-01

56

46 CFR 97.15-10 - Sanitation.  

Code of Federal Regulations, 2011 CFR

... Shipping 4 2011-10-01 2011-10-01 false Sanitation. 97.15-10 Section 97.15-10 Shipping COAST...OPERATIONS Tests, Drills, and Inspections 97.15-10 Sanitation. (a) It shall be the duty of the master and chief...

2011-10-01

57

47 CFR 97.503 - Element standards.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Element standards. 97.503 Section 97...Qualifying Examination Systems 97.503 Element standards. A written examination...of a question set as follows: (a) Element 2: 35 questions concerning the...

2012-10-01

58

47 CFR 97.503 - Element standards.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Element standards. 97.503 Section 97...Qualifying Examination Systems 97.503 Element standards. A written examination...of a question set as follows: (a) Element 2: 35 questions concerning the...

2010-10-01

59

47 CFR 97.503 - Element standards.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Element standards. 97.503 Section 97...Qualifying Examination Systems 97.503 Element standards. A written examination...of a question set as follows: (a) Element 2: 35 questions concerning the...

2013-10-01

60

47 CFR 97.503 - Element standards.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Element standards. 97.503 Section 97...Qualifying Examination Systems 97.503 Element standards. A written examination...of a question set as follows: (a) Element 2: 35 questions concerning the...

2011-10-01

61

47 CFR 97.505 - Element credit.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Element credit. 97.505 Section 97.505...Qualifying Examination Systems 97.505 Element credit. (a) The administering...Advanced Class operator license grant: Elements 2 and 3. (2) An unexpired...

2012-10-01

62

47 CFR 97.505 - Element credit.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Element credit. 97.505 Section 97.505...Qualifying Examination Systems 97.505 Element credit. (a) The administering...Advanced Class operator license grant: Elements 2 and 3. (2) An unexpired...

2011-10-01

63

47 CFR 97.505 - Element credit.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Element credit. 97.505 Section 97.505...Qualifying Examination Systems 97.505 Element credit. (a) The administering...Advanced Class operator license grant: Elements 2 and 3. (2) An unexpired...

2013-10-01

64

47 CFR 97.505 - Element credit.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Element credit. 97.505 Section 97.505...Qualifying Examination Systems 97.505 Element credit. (a) The administering...Advanced Class operator license grant: Elements 2 and 3. (2) An unexpired...

2010-10-01

65

14 CFR 33.97 - Thrust reversers.  

...2014-01-01 2014-01-01 false Thrust reversers. 33.97 Section 33.97...Turbine Aircraft Engines 33.97 Thrust reversers. (a) If the engine...must be made from flight-idle forward thrust to maximum reverse thrust and 25...

2014-01-01

66

14 CFR 33.97 - Thrust reversers.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Thrust reversers. 33.97 Section 33.97...Turbine Aircraft Engines 33.97 Thrust reversers. (a) If the engine...must be made from flight-idle forward thrust to maximum reverse thrust and 25...

2010-01-01

67

14 CFR 33.97 - Thrust reversers.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 2011-01-01 false Thrust reversers. 33.97 Section 33.97...Turbine Aircraft Engines 33.97 Thrust reversers. (a) If the engine...must be made from flight-idle forward thrust to maximum reverse thrust and 25...

2011-01-01

68

14 CFR 33.97 - Thrust reversers.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 2012-01-01 false Thrust reversers. 33.97 Section 33.97...Turbine Aircraft Engines 33.97 Thrust reversers. (a) If the engine...must be made from flight-idle forward thrust to maximum reverse thrust and 25...

2012-01-01

69

14 CFR 33.97 - Thrust reversers.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Thrust reversers. 33.97 Section 33.97...Turbine Aircraft Engines 33.97 Thrust reversers. (a) If the engine...must be made from flight-idle forward thrust to maximum reverse thrust and 25...

2013-01-01

70

PHYSICAL METALLURGY AND PROPERTIES OF ZIRCONIUM-URANIUM ALLOYS  

Microsoft Academic Search

The constitution and transformation kinetic behavior of uranium-; zirconium alloys are presented. The system is characterized by complete solid ; solution between gamma uranium and beta zirconium at elevated temperatures and by ; the intermediate hexagonal epsilon phase which forms from this solution at about ; 600 deg C and contains approximately 50 wt.% uranium. Oxygen and nitrogen have a

A. A. Bauer; S. Kass; K. M. Goldman

1958-01-01

71

Mechanism for zirconium oxide atomic layer deposition using bis,,methylcyclopentadienyl...methoxymethyl zirconium  

E-print Network

Zirconium oxide ZrO2 is a promising high-dielectric constant replacement for SiO2 in future microelectronic. 6 and produce high quality dielectric films.7 Using H2O as oxygen source, the expected ALD reaction- tons and desorb as HL. The kinetics of this elimination reac- tion will be determined by the relative

72

The role of subsurface oxygen in the local oxidation of zirconium and zirconium nitride thin films  

Microsoft Academic Search

This paper discusses the growth kinetics of nanometer scale oxide structures grown by atomic force microscope (AFM) assisted lithography. The addition of nitrogen into the sputtering gas during zirconium deposition results in a crystalline ZrN material with oxygen held in solid solution. The diffusion rate of oxygen is high through the crystalline material, allowing it to participate in local anodization

N. Farkas; G. Zhang; K. M. Donnelly; E. A. Evans; R. D. Ramsier; J. A. Dagata

2004-01-01

73

Anodic Electrodeposition of Highly Oriented Zirconium Phosphate and Polyaniline-Intercalated Zirconium Phosphate  

E-print Network

be inter- calated after deposition to give inorganic-organic composites, the method does not offer much-zirconium phosphate with a conducting polymer. Introduction Polymer-inorganic hybrids with lamellar structures can be synthesized by intercalation, ion-exchange, and exfoliation. For bulk-phase materials, intercalation and ion

74

Corrosion resistance of zirconium and zirconium-titanium alloy in hot nitric acid  

Microsoft Academic Search

Since zirconium (Zr) has superior corrosion resistance to concentrated nitric acid (HNO3) at elevated temperature, it has been successfully used as a material for chemical plants to produce HNO3 or spent nuclear fuel reprocessing plants. However, the occurrence of stress corrosion cracking (SCC) has recently been reported in hot nitric acid conditions. The necessary conditions for SCC in Zr, and

Hiroo Nagano; Haruhiko Kajimura; Kazuo Yamanaka

1995-01-01

75

Determination of fracture strength of ?-zirconium hydrides embedded in zirconium matrix at high temperatures  

NASA Astrophysics Data System (ADS)

The fracture strength of ?-zirconium hydrides embedded in a zirconium matrix was determined at temperatures between 25 C and 250 C by ring tensile tests using Zircaloy-2 tubes. Essentially all of the present hydrides in the tubes were re-oriented in the radial direction by a temperature cycling treatment and then tensile stress was applied perpendicular to the hydrides to ensure that brittle fracture would occur at the hydrides. The hydrides failed in a brittle manner below 100 C where-as the zirconium matrix itself underwent ductile fracture without hydride cracking at temperatures above 200 C under plane stress condition. Brittle fracture of the hydrides continued to occur at temperatures up to 250 C under plane strain condition, suggesting that the upper limit temperature for hydride fracture, Tupper, was raised by the triaxial stress state under the plane strain condition. The apparent fracture strength of the hydrides, ?hydridef, was determined at temperatures below Tupper from the measured fracture strength of the tubes, making a correction for the compressive transformation stress in the hydrides. ?hydridef was about 710 MPa at temperatures between 25 C and 250 C at both plane stress and plane strain conditions. The temperature dependency was very small in this temperature range. Tupper was almost equivalent to the cross-over temperature between ?hydridef and the ultimate tensile strength (UTS), which suggests that, at temperatures above Tupper, the zirconium matrix would undergo ductile fracture before the stress in the hydride is raised above ?hydridef, since UTS is smaller than ?hydridef.

Kubo, T.; Kobayashi, Y.; Uchikoshi, H.

2013-04-01

76

Diffusion of hydrogen in zirconium foil  

SciTech Connect

The authors of present research have used in experiments the atomic hydrogen and metallic foil 25--30 {micro}m thick. It has been supposed that these technical operations will permit excluding the influence of surface and diffusional processes on the rate of Me-H interaction. The series of experiments have been carried out and they confirm this assumption. It has been shown that hydrogenation reaction of zirconium foil in atomic hydrogen conforms to the topochemical model of volume segregation of interaction product, and the rate of its flow is independent of the surface processes and hydrogen diffusion in volume.

Schur, D.V.; Pishuk, V.K.; Adejev, V.M. [Inst. of Hydrogen and Solar Energy, Kiev (Ukraine); Zaginaichenko, S.Y. [UAS, Kiev (Ukraine). Inst. for Problems of Materials Science

1998-12-31

77

Creep Behavior of Hydrogenated Zirconium Alloys  

NASA Astrophysics Data System (ADS)

Zirconium (Zr) alloys are the primary structural materials of most water reactors. Creep is considered to be one of the important degradation mechanisms of Zr alloys during reactor operating and repository conditions. Zr alloys pick up hydrogen (H2) during their service from the coolant water. Hydrogen can be present in solid solution or precipitated hydride form in Zr alloys depending upon the temperature and concentration. This study reviews the effect of hydrogen on creep behavior of Zr alloys used in the water reactors.

Sarkar, A.; Boopathy, K.; Eapen, J.; Murty, K. L.

2014-10-01

78

34 CFR 97.409 - Wards.  

Code of Federal Regulations, 2010 CFR

34 Education 1 2010-07-01 2010-07-01...97.409 Section 97.409 Education Office of the Secretary, Department of Education PROTECTION OF HUMAN SUBJECTS...associated in any way (except in the role as advocate or member of...

2010-07-01

79

40 CFR 97.362 - Notification.  

Code of Federal Regulations, 2011 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Transfers 97.362 Notification...days of recordation of a CAIR NOX Ozone Season allowance transfer under 97.361...days of receipt of a CAIR NOX Ozone Season allowance transfer that fails to...

2011-07-01

80

40 CFR 97.362 - Notification.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Transfers 97.362 Notification...days of recordation of a CAIR NOX Ozone Season allowance transfer under 97.361...days of receipt of a CAIR NOX Ozone Season allowance transfer that fails to...

2014-07-01

81

Electrochemical study of corrosion phenomena in zirconium alloys  

E-print Network

Shadow corrosion of zirconium alloy fuel cladding in BWR environments, the phenomenon in which accelerated corrosion is experienced when the cladding surface is in close proximity to other metals, has become a potentially ...

Treeman, Nicole M

2005-01-01

82

Separation of zirconium from hafnium by solvent extraction  

SciTech Connect

Separation of zirconium and hafnium by solvent extraction with a tertiary amine from sulfuric acid solution is improved by addition of water-soluble alpha -hydroxycarboxylic acid to the aqueous phase.

Macdonald, D.J.

1980-11-04

83

Extractive separation of uranium and zirconium sulfates by amines  

SciTech Connect

This paper describes an amine extraction process for zirconium and uranium separation. The behaviour of an extraction system containing uranium (VI) sulfate, zirconium (IV) sulfate, 0.2 and 0.5 M sulfuric acid (as the original aqueous phase), tertiary amine tri-n-lauryl- amine or primary amine Primene JMT in benzene (as the original organic phase) is discussed on the basis of equilibrium data. The measured dependences show that the degree of extraction of zirconium at the sulfuric acid concentration of 0.5 M and above is only slightly affected by a presence of uranium in solution. From this surprising behaviour it follows that zirconium may be employed for the displacement of uranium from the organic phase. This effect is more pronounced with the primary amine Primene JMT than with TLA. 29 refs., 4 figs., 1 tab.

Schroetterova, D.; Nekovar, P.; Mrnka, M. [Prague Inst. of Chemical Technology (Czechoslovakia)

1992-04-01

84

Modelling precipitation in zirconium niobium alloys  

NASA Astrophysics Data System (ADS)

A model has been developed to predict precipitation of ?-Nb in zirconium-niobium alloys. The model considers two transformation mechanisms; in situ transformation of any retained ?-Zr and homogeneous nucleation of ?-Nb. The two mechanisms are allowed to operate concurrently and compete for the available solute. The model has been calibrated and tested using data in the literature and is able to reasonably reproduce these results without introducing non-physical fitting parameters. It has then been applied to predict the effects of prior ?-Zr fraction, oxygen content, and temperature on the precipitation kinetics of ?-Nb. These calculations predict that prior ?-Zr fraction has a strong effect on the kinetics of subsequent ?-Nb evolution and that oxygen content is also critical, with higher oxygen levels predicted to result in faster kinetics and shift in the peak transformation rate to higher temperatures.

Robson, J. D.

2008-07-01

85

On the dynamic tensile strength of Zirconium  

NASA Astrophysics Data System (ADS)

Despite its fundamental nature, the process of dynamic tensile failure (spall) is poorly understood. Spall initiation via cracks, voids, etc, before subsequent coalesce, is known to be highly microstructure-dependant. In particular, the availability of slip planes and other methods of plastic deformation controls the onset (or lack thereof) of spall. While studies have been undertaken into the spall response of BCC and FCC materials, less attention has paid to the spall response of highly anisotropic HCP materials. Here the dynamic behaviour of zirconium is investigated via plate-impact experiments, with the aim of building on an ongoing in-house body of work investigating these highly complex materials. In particular, in this paper the effect of impact stress on spall in a commercially sourced Zr rod is considered, with apparent strain-rate softening highlighted.

Appleby-Thomas, G. J.; Hameed, A.; Vignjevic, R.; Hazell, P. J.; Painter, J.; Cademartori, S.

2014-05-01

86

Electrical conductivity of transition metal containing crystalline zirconium phosphate materials  

Microsoft Academic Search

?-Zirconium phosphate (?-ZrP) has been prepared in various transition metal containing forms, and their structure (identified by XRD), thermal behaviour and specific surface area were determined and their electrical resistivity was measured. On the basis of experimental data, the monoclinic cell parameters for Co(II), Ni(II), Cu(II), and Zn(II) containing crystalline zirconium phosphates were calculated. They showed characteristic thermal decomposition and

L Szirtes; J Megyeri; E Kuzmann; Z Klencsr

2001-01-01

87

Quercetin as colorimetric reagent for determination of zirconium  

USGS Publications Warehouse

Methods described in the literature for the determination of zirconium are generally designed for relatively large amounts of this element. A good procedure using colorimetric reagent for the determination of trace amounts is desirable. Quercetin has been found to yield a sensitive color reaction with zirconium suitable for the determination of from 0.1 to 50?? of zirconium dioxide. The procedure developed involves the separation of zirconium from interfering elements by precipitation with p-dimethylaminoazophenylarsonic acid prior to its estimation with quercetin. The quercetin reaction is carried out in 0.5N hydrochloric acid solution. Under the operating conditions it is indicated that quercetin forms a 2 to 1 complex with zirconium; however, a 2 to 1 and a 1 to 1 complex can coexist under special conditions. Approximate values for the equilibrium constants of the complexes are K1 = 0.33 ?? 10-5 and K2 = 1.3 ?? 10-9. Seven Bureau of Standards samples of glass sands and refractories were analyzed with excellent results. The method described should find considerable application in the analysis of minerals and other materials for macro as well as micro amounts of zirconium.

Grimaldi, F. S.; White, C. E.

1953-01-01

88

Preliminary investigation of zirconium boride ceramals for gas-turbine blade applications  

NASA Technical Reports Server (NTRS)

Zirconium boride ZrB2 ceramals were investigated for possible gas-turbine-blade application. Included in the study were thermal shock evaluations of disks, preliminary turbine-blade operation, and observations of oxidation resistance. Thermal shock disks of the following three compositions were studied: (a) 97.5 percent ZrB2 plus 2.5 percent B by weight; (b) 92.5 percent ZrB2 plus 7.5 percent B by weight; and (c) 100 percent ZrB2. Thermal shock disks were quenched from temperatures of 1800 degrees, 2000 degrees, 2200 degrees, and 2400 degrees F. The life of turbine blades containing 93 percent ZrB2 plus 7 percent B by weight was determined in gas-turbine tests. The blades were run at approximately 1600 degrees F and 15,000 to 26,000 rpm. The thermal shock resistance of the 97.5 percent ZrB2 plus 2.5 percent boron ceramals compares favorably with that of TiC plus Co and TiC plus Ni ceramals. Oxidation of the disks during the thermal shock evaluation was slight for the comparatively short time (8.3 hr) up through 2000 degrees F. Oxidation of a specimen was severe, however, after 100 hours at 2000 degrees F. The turbine blade performance evaluation of the 93 percent ZrB2 plus 7 percent B composition was preliminary in scope ; no conclusions can be drawn.

Hoffman, Charles A

1953-01-01

89

14 CFR 97.1 - Applicability.  

Code of Federal Regulations, 2010 CFR

...CONTINUED) AIR TRAFFIC AND GENERAL OPERATING RULES STANDARD INSTRUMENT PROCEDURES General 97.1 Applicability. (a) This part prescribes standard instrument approach procedures to civil airports in the United...

2010-01-01

90

46 CFR 111.97-7 - Distribution.  

Code of Federal Regulations, 2010 CFR

...GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems 111.97-7 Distribution. (a) Each distribution panelboard for...

2010-10-01

91

46 CFR 111.97-1 - Applicability.  

Code of Federal Regulations, 2010 CFR

...ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems 111.97-1 Applicability... This subpart applies to electric power-operated watertight door systems required under Subpart...

2010-10-01

92

40 CFR 97.355 - Banking.  

Code of Federal Regulations, 2010 CFR

...TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.355 Banking. (a) CAIR NOX Ozone Season allowances may be banked for future...section. (b) Any CAIR NOX Ozone Season allowance that is held in a...

2010-07-01

93

40 CFR 97.355 - Banking.  

...TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.355 Banking. (a) CAIR NOX Ozone Season allowances may be banked for future...section. (b) Any CAIR NOX Ozone Season allowance that is held in a...

2014-07-01

94

40 CFR 97.361 - EPA recordation.  

Code of Federal Regulations, 2010 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Transfers 97.361 EPA...section) of receiving a CAIR NOX Ozone Season allowance transfer, the Administrator will record a CAIR NOX Ozone Season allowance transfer by moving each...

2010-07-01

95

40 CFR 97.361 - EPA recordation.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Transfers 97.361 EPA...section) of receiving a CAIR NOX Ozone Season allowance transfer, the Administrator will record a CAIR NOX Ozone Season allowance transfer by moving each...

2014-07-01

96

40 CFR 97.355 - Banking.  

Code of Federal Regulations, 2011 CFR

...TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.355 Banking. (a) CAIR NOX Ozone Season allowances may be banked for future...section. (b) Any CAIR NOX Ozone Season allowance that is held in a...

2011-07-01

97

40 CFR 97.361 - EPA recordation.  

Code of Federal Regulations, 2011 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Transfers 97.361 EPA...section) of receiving a CAIR NOX Ozone Season allowance transfer, the Administrator will record a CAIR NOX Ozone Season allowance transfer by moving each...

2011-07-01

98

27 CFR 25.97 - Continuation certificate.  

Code of Federal Regulations, 2012 CFR

... Alcohol, Tobacco Products and Firearms ALCOHOL AND TOBACCO TAX AND TRADE BUREAU, DEPARTMENT OF THE TREASURY LIQUORS BEER Bonds and Consents of Surety 25.97 Continuation certificate. If the contract of surety between the...

2012-04-01

99

28 CFR 97.2 - Definitions.  

Code of Federal Regulations, 2010 CFR

...SERVICES 97.2 Definitions. (a) Crime of violence. The term crime of violence has the same meaning as in section 924...Section 924(c)(3) states that the term crime of violence means an offense that is a...

2010-07-01

100

29 CFR 97.21 - Payment.  

Code of Federal Regulations, 2010 CFR

...TO STATE AND LOCAL GOVERNMENTS Post-Award Requirements Financial Administration 97.21 Payment. (a) Scope...initial period generally geared to the grantee's disbursing cycle. Thereafter, the awarding agency shall reimburse the...

2010-07-01

101

46 CFR 97.37-3 - General.  

Code of Federal Regulations, 2012 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-3 General...subpart red letters are specified, letters of a contrasting color on a red background will be...

2012-10-01

102

46 CFR 97.37-3 - General.  

Code of Federal Regulations, 2010 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-3 General...subpart red letters are specified, letters of a contrasting color on a red background will be...

2010-10-01

103

46 CFR 97.37-3 - General.  

Code of Federal Regulations, 2013 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-3 General...subpart red letters are specified, letters of a contrasting color on a red background will be...

2013-10-01

104

46 CFR 97.37-3 - General.  

Code of Federal Regulations, 2011 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-3 General...subpart red letters are specified, letters of a contrasting color on a red background will be...

2011-10-01

105

7 CFR 97.156 - Addresses.  

...PLANT VARIETY AND PROTECTION Attorneys and Agents 97.156 Addresses. Attorneys and agents practicing before the Plant Variety Protection...Office shall notify the Office in writing of any change of address. The Office shall address...

2014-01-01

106

29 CFR 97.3 - Definitions.  

...Section 97.3 Labor Office of the Secretary of Labor UNIFORM ADMINISTRATIVE REQUIREMENTS FOR GRANTS AND COOPERATIVE AGREEMENTS...housing agency under the United States Housing Act of 1937) school district, special district, intrastate district,...

2014-07-01

107

The p97-FAF1 Protein Complex Reveals a Common Mode of p97 Adaptor Binding*  

PubMed Central

p97, also known as valosin-containing protein, is a versatile participant in the ubiquitin-proteasome system. p97 interacts with a large network of adaptor proteins to process ubiquitylated substrates in different cellular pathways, including endoplasmic reticulum-associated degradation and transcription factor activation. p97 and its adaptor Fas-associated factor-1 (FAF1) both have roles in the ubiquitin-proteasome system during NF-?B activation, although the mechanisms are unknown. FAF1 itself also has emerging roles in other cell-cycle pathways and displays altered expression levels in various cancer cell lines. We have performed a detailed study the p97-FAF1 interaction. We show that FAF1 binds p97 stably and in a stoichiometry of 3 to 6. Cryo-EM analysis of p97-FAF1 yielded a 17 ? reconstruction of the complex with FAF1 above the p97 ring. Characteristics of p97-FAF1 uncovered in this study reveal common features in the interactions of p97, providing mechanistic insight into how p97 mediates diverse functionalities. PMID:24619421

Ewens, Caroline A.; Panico, Silvia; Kloppsteck, Patrik; McKeown, Ciaran; Ebong, Ima-Obong; Robinson, Carol; Zhang, Xiaodong; Freemont, Paul S.

2014-01-01

108

High-speed deformation and fracture of the dioxide-zirconium ceramics and zirconium alumina concrete  

NASA Astrophysics Data System (ADS)

The results of dynamic tests of two refractory materials based on zirconium dioxide: three types of ceramics and barium-aluminate concrete. The ceramic specimens had various initial density and porosity and also differed by technology of manufacturing. Compression tests were carried out using the Kolsky technique and its updating - specimen in a rigid jacket. The dynamic stress-strain curves were obtained. The strong influence of sample's initial grain composition, mode of stressed-strained state and technologies of manufacturing of specimens onto ceramics mechanical properties is marked.

Bragov, A.; Kruszka, L.; Lomunov, A.; Konstantinov, A.; Lamzin, D.; Filippov, A.

2012-08-01

109

Evaluation of zirconium-iron-rhenium alloys as surrogates for a technetium alloy waste form  

E-print Network

Stainless steel zirconium alloys were developed by the US Department of Energy Laboratories as metallic waste forms for noble metal fission products. This thesis evaluates ironzirconiumrhenium alloys to establish a technical basis for using...

Mews, Paul Aaron

2009-05-15

110

Dissolved zirconium in the north Pacific Ocean  

SciTech Connect

Picomolar levels of dissolved Zr in seawater were measured using an analytical technique developed with a Chelex-100 extraction/concentration step and subsequent detection by isotope-dilution inductively-coupled-plasma mass spectrometry (ID-ICP-MS). Here the authors present the first vertical profile of Zr in the oceans, from the central-North Pacific, and a horizontal surface transect across the western Pacific. Dissolved Zr ranges from 12--95 pmol/kg in the surface waters then increases linearly with depth to a maximum of 300 pmol/kg in the deep water. The vertical profile shows a strong correlation with Si in the mid-waters, with higher Zr/Si ratios in the surface and bottom waters. There is evidence of both a bottom source and a coastal source of dissolved Zr to the oceans. A comparison with dissolved Ti and Be shows similar depth dependence, but an enrichment in Zr/Ti and a depletion in Zr/Be ratios in seawater relative to average crustal materials. Zirconium appears to have a reactivity intermediate between these two elements. 24 refs., 4 figs., 1 tab.

McKelvey, B.A.; Orians, K.J. (Univ. of British Columbia, Vancouver (Canada))

1993-08-01

111

Apatite formation on bioactive zirconium metal prepared by chemical treatment.  

PubMed

Bioactive metallic materials, which can directly bond to living bone, are badly needed in dental and orthopedic implants for better long-term results. Forming a layer of bone-like apatite on the surface of the metal is one of the most promising methods to increase its bioactivity. This study creates a new chemical treatment for zirconium metal to induce apatite formation in a simulated body fluid (SBF), and analyzes the apatite layer by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR). Zirconium samples were soaked in 10% CuCl2 aqueous solution at 80 degrees C for 72 hours, heat-treated at 500 degrees C for one hour and soaked in SBF for various periods. An apatite-like layer appeared on the zirconium surface as early as three days in SBF, and increased with immersion time. EDS and FTIR confirmed that the deposited layer was apatite. This implies that bioinert zirconium metal can become bioactive by forming an apatite layer in a simulated body fluid after a suitable chemical treatment. The ZrOOH+ hydrogel layer produced on the zirconium surface by CuCl2 and heat-treatments is thought to induce the apatite formation. PMID:12085656

Shi, Xinfeng; Hulbert, Samuel

2002-01-01

112

Experimental Study of Zirconium(IV) Extraction from Fluoride-Containing Acid Solutions  

Microsoft Academic Search

Zirconium(IV) extraction from acid solutions was studied, and the optimal parameters of the process were found. Extractants for zirconium(IV) recovery from nitric and sulfuric acid solutions in the presence of fluoride ions were selected. The distribution coefficients of zirconium(IV) and fluoride ion were determined.

I. A. Dibrov; D. E. Chirkst; T. E. Litvinova

2002-01-01

113

LIQUID-LIQUID EXTRACTION OF HAFNIUM FROM ZIRCONIUM BY TRIBUTYL PHOSPHATE  

Microsoft Academic Search

ABS>The removal of hafnium from zirconium is one of a number of ; operations required to produce high purity zirconium metal for use in nuclear ; reactors. Since the metallurgical operations involved in the production of ; zirconium must use the products of hafnium-removal processes, the choice of a ; process for hafnium removal must be integrated with subsequent metallurgical

G. H. Beyer; H. C. Peterson

1951-01-01

114

Synthesis and characterization of a mesoporous hydrous zirconium oxide used for arsenic removal from drinking water  

SciTech Connect

Powder (20-50 {mu}m) mesoporous hydrous zirconium oxide was prepared from a zirconium salt granular precursor. The effect of some process parameters on product morphology, porous structure and adsorption performance has been studied. The use of hydrous zirconium oxide for selective arsenic removal from drinking water is discussed.

Bortun, Anatoly; Bortun, Mila; Pardini, James [MELChemicals Inc, 500 Barbertown Point Breeze Road, Flemington, NJ 08822 (United States)] [MELChemicals Inc, 500 Barbertown Point Breeze Road, Flemington, NJ 08822 (United States); Khainakov, Sergei A. [Departamento de Quimica Organica e Inorganica, Universidad de Oviedo, 33006 Oviedo (Spain)] [Departamento de Quimica Organica e Inorganica, Universidad de Oviedo, 33006 Oviedo (Spain); Garcia, Jose R., E-mail: jrgm@uniovi.es [Departamento de Quimica Organica e Inorganica, Universidad de Oviedo, 33006 Oviedo (Spain)

2010-02-15

115

37 CFR 1.97 - Filing of information disclosure statement.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 false Filing of information disclosure statement. 1.97 Section 1.97...National Processing Provisions Information Disclosure Statement 1.97 Filing of information disclosure statement. (a) In order for...

2010-07-01

116

7 CFR 97.15 - Assigned varieties and certificates.  

Code of Federal Regulations, 2013 CFR

...Assigned varieties and certificates. 97.15 Section 97.15 Agriculture Regulations of the Department...AND PROTECTION The Application 97.15 Assigned varieties and certificates. In case the whole or a part interest in a...

2013-01-01

117

7 CFR 97.15 - Assigned varieties and certificates.  

...Assigned varieties and certificates. 97.15 Section 97.15 Agriculture Regulations of the Department...AND PROTECTION The Application 97.15 Assigned varieties and certificates. In case the whole or a part interest in a...

2014-01-01

118

7 CFR 97.15 - Assigned varieties and certificates.  

Code of Federal Regulations, 2011 CFR

...Assigned varieties and certificates. 97.15 Section 97.15 Agriculture Regulations of the Department...AND PROTECTION The Application 97.15 Assigned varieties and certificates. In case the whole or a part interest in a...

2011-01-01

119

7 CFR 97.15 - Assigned varieties and certificates.  

Code of Federal Regulations, 2012 CFR

...Assigned varieties and certificates. 97.15 Section 97.15 Agriculture Regulations of the Department...AND PROTECTION The Application 97.15 Assigned varieties and certificates. In case the whole or a part interest in a...

2012-01-01

120

7 CFR 97.15 - Assigned varieties and certificates.  

Code of Federal Regulations, 2010 CFR

...Assigned varieties and certificates. 97.15 Section 97.15 Agriculture Regulations of the Department...AND PROTECTION The Application 97.15 Assigned varieties and certificates. In case the whole or a part interest in a...

2010-01-01

121

34 CFR 97.109 - IRB review of research.  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false IRB review of research. 97.109 Section 97.109 Education...Basic ED Policy for Protection of Human Research Subjects) 97.109 IRB review of research. (a) An IRB shall review and...

2012-07-01

122

34 CFR 97.109 - IRB review of research.  

... 2014-07-01 false IRB review of research. 97.109 Section 97.109 Education...Basic ED Policy for Protection of Human Research Subjects) 97.109 IRB review of research. (a) An IRB shall review and...

2014-07-01

123

34 CFR 97.109 - IRB review of research.  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false IRB review of research. 97.109 Section 97.109 Education...Basic ED Policy for Protection of Human Research Subjects) 97.109 IRB review of research. (a) An IRB shall review and...

2013-07-01

124

10 CFR 52.97 - Issuance of combined licenses.  

Code of Federal Regulations, 2011 CFR

...97 Section 52.97 Energy NUCLEAR REGULATORY COMMISSION (CONTINUED...CERTIFICATIONS, AND APPROVALS FOR NUCLEAR POWER PLANTS Combined Licenses 52.97...inimical to the common defense and security or to the health and safety...

2011-01-01

125

10 CFR 52.97 - Issuance of combined licenses.  

...97 Section 52.97 Energy NUCLEAR REGULATORY COMMISSION (CONTINUED...CERTIFICATIONS, AND APPROVALS FOR NUCLEAR POWER PLANTS Combined Licenses 52.97...inimical to the common defense and security or to the health and safety...

2014-01-01

126

10 CFR 52.97 - Issuance of combined licenses.  

Code of Federal Regulations, 2012 CFR

...97 Section 52.97 Energy NUCLEAR REGULATORY COMMISSION (CONTINUED...CERTIFICATIONS, AND APPROVALS FOR NUCLEAR POWER PLANTS Combined Licenses 52.97...inimical to the common defense and security or to the health and safety...

2012-01-01

127

7 CFR 97.18 - Applications handled in confidence.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 false Applications handled in confidence. 97.18 Section 97.18 Agriculture... 97.18 Applications handled in confidence. (a) Pending applications shall be handled in confidence. Except as provided...

2013-01-01

128

7 CFR 97.18 - Applications handled in confidence.  

...2014-01-01 false Applications handled in confidence. 97.18 Section 97.18 Agriculture... 97.18 Applications handled in confidence. (a) Pending applications shall be handled in confidence. Except as provided...

2014-01-01

129

7 CFR 97.18 - Applications handled in confidence.  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Applications handled in confidence. 97.18 Section 97.18 Agriculture... 97.18 Applications handled in confidence. (a) Pending applications shall be handled in confidence. Except as provided...

2011-01-01

130

7 CFR 97.18 - Applications handled in confidence.  

Code of Federal Regulations, 2012 CFR

...2012-01-01 false Applications handled in confidence. 97.18 Section 97.18 Agriculture... 97.18 Applications handled in confidence. (a) Pending applications shall be handled in confidence. Except as provided...

2012-01-01

131

7 CFR 97.18 - Applications handled in confidence.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Applications handled in confidence. 97.18 Section 97.18 Agriculture... 97.18 Applications handled in confidence. (a) Pending applications shall be handled in confidence. Except as provided...

2010-01-01

132

40 CFR 97.214 - Objections concerning CAIR designated representative.  

...97.214 Section 97.214 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...provided in 97.212(a) or (b), no objection or other communication submitted to the permitting authority or the...

2014-07-01

133

46 CFR 97.37-9 - Carbon dioxide alarm.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Carbon dioxide alarm. 97.37-9 Section 97.37-9...Emergency Equipment, Etc. 97.37-9 Carbon dioxide alarm. (a) All carbon dioxide alarms shall be conspicuously identified:...

2010-10-01

134

46 CFR 97.37-9 - Carbon dioxide alarm.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Carbon dioxide alarm. 97.37-9 Section 97.37-9...Emergency Equipment, Etc. 97.37-9 Carbon dioxide alarm. (a) All carbon dioxide alarms shall be conspicuously identified:...

2011-10-01

135

47 CFR 97.405 - Station in distress.  

Code of Federal Regulations, 2010 CFR

...Section 97.405 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES AMATEUR RADIO SERVICE Providing Emergency Communications 97.405 Station in distress....

2010-10-01

136

47 CFR 97.405 - Station in distress.  

Code of Federal Regulations, 2011 CFR

...Section 97.405 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES AMATEUR RADIO SERVICE Providing Emergency Communications 97.405 Station in distress....

2011-10-01

137

47 CFR 97.405 - Station in distress.  

Code of Federal Regulations, 2012 CFR

...Section 97.405 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES AMATEUR RADIO SERVICE Providing Emergency Communications 97.405 Station in distress....

2012-10-01

138

47 CFR 97.405 - Station in distress.  

Code of Federal Regulations, 2013 CFR

...Section 97.405 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES AMATEUR RADIO SERVICE Providing Emergency Communications 97.405 Station in distress....

2013-10-01

139

40 CFR 97.103 - Measurements, abbreviations, and acronyms.  

...2014-07-01 2013-07-01 true Measurements, abbreviations, and acronyms. 97...Program General Provisions 97.103 Measurements, abbreviations, and acronyms. Measurements, abbreviations, and acronyms...

2014-07-01

140

40 CFR 97.303 - Measurements, abbreviations, and acronyms.  

...2014-07-01 2013-07-01 true Measurements, abbreviations, and acronyms. 97...Program General Provisions 97.303 Measurements, abbreviations, and acronyms. Measurements, abbreviations, and acronyms...

2014-07-01

141

Nuclear Engineering and Design/Fusion 2 (1985) 97-110 97 North-Holland, Amsterdam  

E-print Network

Nuclear Engineering and Design/Fusion 2 (1985) 97-110 97 North-Holland, Amsterdam DEVELOPMENT OF DESIGN EQUATIONS FOR FERRITIC ALLOYS IN FUSION REACTORS Robert J. AMODEO and Nasr M. GHONIEM Fusion in determining the lifetime of materials in the fusion environment [1]. Equations which describe the swelling

Ghoniem, Nasr M.

142

NASA/CR-97-206268 ICASE Report No. 97-68  

E-print Network

NASA/CR-97-206268 ICASE Report No. 97-68 _th ,NNIVERSARY Essential Elements of Computational Algorithms for Aerodynamic Analysis and Design Antony Jameson December 1997 #12;The NASA STI Program Off'we... in Profile Since its founding, NASA has been dedicated to the advancement of aeronautics and space science

Jameson, Antony

143

ARDB-122 R. Siemann 9/9/97 Modified 10/11/97  

E-print Network

ARDB-122 R. Siemann 9/9/97 Modified 10/11/97 1 Gradient Limits - Summary of Perry Wilson, SLAC-PUB-7449 Perry Wilson present gradient limits in his paper "Scaling Linear Colliders to 5 TeV and Above"1/2 dependence. Pulse length dependence comes from A. Vlieks et al.3 Perry describes these data as depending

144

Material property correlations for the niobium-1% zirconium alloy  

E-print Network

(Member) John . Poston (Head of Department) K. Ted Harwig (Member) August 1989 Material Property Correlations for the Niobium-1% Zirconium Alloy. (August 1989) David James Senor, B, S. , Texas A8cM University Chair of Advisory Committee: Dr. K. L... (Member) John . Poston (Head of Department) K. Ted Harwig (Member) August 1989 Material Property Correlations for the Niobium-1% Zirconium Alloy. (August 1989) David James Senor, B, S. , Texas A8cM University Chair of Advisory Committee: Dr. K. L...

Senor, David James

2012-06-07

145

In-situ stabilization of radioactive zirconium swarf  

SciTech Connect

The method for treating ignitable cutting swarf in accordance with the present invention involves collecting cutting swarf in a casting mold underwater and injecting a binder mixture comprising vinyl ester styrene into the vessel to fill void volume; and form a mixture comprising swarf and vinyl ester styrene; and curing the mixture. The method is especially useful for stabilizing the ignitable characteristics of radioactive zirconium cutting swarf, and can be used to solidify zirconium swarf, or other ignitable finely divided material, underwater. The process could also be performed out of water with other particulate wastes.

Hess, Clay C.

1997-12-01

146

Variant selection and transformation texture in zirconium alloy Excel  

NASA Astrophysics Data System (ADS)

The crystallographic texture and variant selection during phase transformations in zirconium alloy Excel (Zr-3.5% Sn-0.8% Mo-0.8% Nb) was investigated. It was shown that upon water-quenching from ?Zr + ?Zr or fully ?Zr regions, variant selection occurs during ?Zr ? ??Zr martensitic transformation. Also during air-cooling from the ?Zr + ?Zr region, only a partial memory effect and some transformation texture with variant selection was observed which is contrary to previous reports on zirconium alloys heat treated in the ?Zr + ?Zr region.

Sattari, M.; Holt, R. A.; Daymond, M. R.

2014-10-01

147

Experiments on explosive interactions between zirconium-containing melt and water (ZREX).  

SciTech Connect

The results of two series of experiments on explosive interactions between zirconium-containing melt and water are described. The first series of experiments involved dropping 1-kg batches of zirconium-zirconium dioxide mixture melt into a column of water while the second series employed 1.2-kg batches of zirconium-stainless steel mixture melt. Explosions took place only in those tests which were externally triggered. While the extent of zirconium oxidation in the triggered experiments was quite large, the explosion energies estimated from the experimental measurements were found to be small compared to the combined thermal and chemical energy available.

Cho, D. H.

1998-04-10

148

DlgS97/SAP97, a neuronal isoform of discs large, regulates ethanol tolerance.  

PubMed

From a genetic screen for Drosophila melanogaster mutants with altered ethanol tolerance, we identified intolerant (intol), a novel allele of discs large 1 (dlg1). Dlg1 encodes Discs Large 1, a MAGUK (Membrane Associated Guanylate Kinase) family member that is the highly conserved homolog of mammalian PSD-95 and SAP97. The intol mutation disrupted specifically the expression of DlgS97, a SAP97 homolog, and one of two major protein isoforms encoded by dlg1 via alternative splicing. Expression of the major isoform, DlgA, a PSD-95 homolog, appeared unaffected. Ethanol tolerance in the intol mutant could be partially restored by transgenic expression of DlgS97, but not DlgA, in specific neurons of the fly's brain. Based on co-immunoprecipitation, DlgS97 forms a complex with N-methyl-D-aspartate (NMDA) receptors, a known target of ethanol. Consistent with these observations, flies expressing reduced levels of the essential NMDA receptor subunit dNR1 also showed reduced ethanol tolerance, as did mutants in the gene calcium/calmodulin-dependent protein kinase (caki), encoding the fly homolog of mammalian CASK, a known binding partner of DlgS97. Lastly, mice in which SAP97, the mammalian homolog of DlgS97, was conditionally deleted in adults failed to develop rapid tolerance to ethanol's sedative/hypnotic effects. We propose that DlgS97/SAP97 plays an important and conserved role in the development of tolerance to ethanol via NMDA receptor-mediated synaptic plasticity. PMID:23145041

Maiya, Rajani; Lee, Seonok; Berger, Karen H; Kong, Eric C; Slawson, Justin B; Griffith, Leslie C; Takamiya, Kogo; Huganir, Richard L; Margolis, Ben; Heberlein, Ulrike

2012-01-01

149

An Electrolytic Method to Form Zirconium Hydride Phases in Zirconium Alloys with Morphologies Similar to Hydrides Formed in Used Nuclear Fuel  

E-print Network

AN ELECTROLYTIC METHOD TO FORM ZIRCONIUM HYDRIDE PHASES IN ZIRCONIUM ALLOYS WITH MORPHOLOGIES SIMILAR TO HYDRIDES FORMED IN USED NUCLEAR FUEL A Thesis by SAMUEL HOUSTON KUHR 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 August 2012 Major Subject: Nuclear Engineering ii An Electrolytic Method to Form Zirconium Hydride Phases...

Kuhr, Samuel Houston

2012-10-19

150

Herman Schmit October `97 Reconfigurable Computing  

E-print Network

October `97 Performance Algorithm FPGA system Comparison CPU Speedup DNA Matching SPLASH 2 SPARC 10 4300 75MHz 33.8 FIR filter 1 Xilinx FPGA DSP 50MHz 17.9 Hidden Markov Model 1 Xilinx FPGA SPARC 10 24(s) Reconfigurable Coprocessor(s) Data-flow dominatedControl-flow dominated Memory Superscalar w/ Reconfigurable

Budiu, Mihai

151

40 CFR 97.381 - General.  

...AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.381 General...through HHHH of this part, a CAIR NOX Ozone Season opt-in unit shall be treated as a CAIR NOX Ozone Season unit for purposes of applying such...

2014-07-01

152

40 CFR 97.506 - Standard requirements.  

Code of Federal Regulations, 2013 CFR

...CAIR NOX AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.506 Standard requirements...designated representative, of each TR NOX Ozone Season source and each TR NOX Ozone Season unit at the source shall comply with the...

2013-07-01

153

40 CFR 97.506 - Standard requirements.  

...CAIR NOX AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.506 Standard requirements...designated representative, of each TR NOX Ozone Season source and each TR NOX Ozone Season unit at the source shall comply with the...

2014-07-01

154

40 CFR 97.526 - Banking.  

...AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.526 Banking. (a) A TR NOX Ozone Season allowance may be banked for future...section. (b) Any TR NOX Ozone Season allowance that is held in a...

2014-07-01

155

40 CFR 97.380 - Applicability.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.380 Applicability. A CAIR NOX Ozone Season opt-in unit must be a unit that...establishing procedures concerning CAIR Ozone Season opt-in units; (b) Is not a...

2014-07-01

156

40 CFR 97.506 - Standard requirements.  

Code of Federal Regulations, 2012 CFR

...CAIR NOX AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.506 Standard requirements...designated representative, of each TR NOX Ozone Season source and each TR NOX Ozone Season unit at the source shall comply with the...

2012-07-01

157

Characterization of uranium and uranium-zirconium deposits produced in electrorefining of spent nuclear fuel  

SciTech Connect

This paper describes the metallurgical characterization of deposits produced in molten salt electrorefining of uranium and uranium - 10.% zirconium alloy. The techniques of characterization are described with emphasis on considerations given to the radioactive and pyrophoric nature of the samples. The morphologies observed and their implications for deposit performance are also presented - samples from pure uranium deposits were comprised of chains of uranium crystals with a characteristic rhomboidal shape, while morphologies of samples from deposits containing zirconium showed more polycrystalline features. Zirconium was found to be present as a second, zirconium metal phase at or very near the uranium-zirconium dendrite surfaces. Higher collection efficiencies and total deposit weights were observed for the uranium-zirconium deposits; this performance increase is likely a result of better mechanical properties exhibited by the uranium-zirconium dendrite morphology. 18 refs., 10 figs., 1 tab.

Totemeier, T.C.

1997-09-01

158

Antimicrobial effects of silver zeolite, silver zirconium phosphate silicate and silver zirconium phosphate against oral microorganisms  

PubMed Central

Objective To evaluate the antimicrobial activities of silver inorganic materials, including silver zeolite (AgZ), silver zirconium phosphate silicate (AgZrPSi) and silver zirconium phosphate (AgZrP), against oral microorganisms. In line with this objective, the morphology and structure of each type of silver based powders were also investigated. Methods The antimicrobial activities of AgZ, AgZrPSi and AgZrP were tested against Streptococcus mutans, Lactobacillus casei, Candida albicans and Staphylococcus aureus using disk diffusion assay as a screening test. The minimum inhibitory concentration (MIC) and minimum lethal concentration (MLC) were determined using the modified membrane method. Scanning electron microscope and X-ray diffraction were used to investigate the morphology and structure of these silver materials. Results All forms of silver inorganic materials could inhibit the growth of all test microorganisms. The MIC of AgZ, AgZrPSi and AgZrP was 10.0 g/L whereas MLC ranged between 10.060.0 g/L. In terms of morphology and structure, AgZrPSi and AgZrP had smaller sized particles (1.53.0 m) and more uniformly shaped than AgZ. Conclusions Silver inorganic materials in the form of AgZ, AgZrPSi and AgZrP had antimicrobial effects against all test oral microorganisms and those activities may be influenced by the crystal structure of carriers. These results suggest that these silver materials may be useful metals applied to oral hygiene products to provide antimicrobial activity against oral infection. PMID:23570016

Saengmee-anupharb, Sirikamon; Srikhirin, Toemsak; Thaweboon, Boonyanit; Thaweboon, Sroisiri; Amornsakchai, Taweechai; Dechkunakorn, Surachai; Suddhasthira, Theeralaksna; Kamaguchi, Arihide

2013-01-01

159

Discovery of Yttrium, Zirconium, Niobium, Technetium, and Ruthenium Isotopes  

E-print Network

Currently, thirty-four yttrium, thirty-five zirconium, thirty-four niobium, thirty-five technetium, and thirty-eight ruthenium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

A. Nystrom; M. Thoennessen

2011-02-11

160

Hydrogen pickup measurements in zirconium alloys: Relation to oxidation kinetics  

E-print Network

Hydrogen pickup measurements in zirconium alloys: Relation to oxidation kinetics Adrien Couet a to balance charge. That is, the pickup of hydrogen shows an inverse relationship to oxidation kinetics, indicating that, if transport of charged species is rate limiting, oxide transport properties such as oxide

Motta, Arthur T.

161

Stress Corrosion Cracking of Zirconium in Hot Nitric Acid  

Microsoft Academic Search

Zirconium (Zr) has excellent general corrosion resistance in nitric acid. However, stress corrosion cracking (SCC) has been reported in concentrated nitric acid. The purpose of this paper is to evaluate the SCC susceptibility of Zr as a function of HNO[sub 3] concentration, from 6 to 94%, and temperature. The SCC mechanism was also investigated in relation to the electrochemical behavior.

H. Kajimura; H. Nagano

1992-01-01

162

Mn-Ti-Zr (Manganese-Titanium-Zirconium)  

NASA Astrophysics Data System (ADS)

This document is part of Subvolume C3 'Non-Ferrous Metal Systems. Part 3: Selected Soldering and Brazing Systems' of Volume 11 'Ternary Alloy Systems - Phase Diagrams, Crystallographic and Thermodynamic Data critically evaluated by MSIT' of Landolt-Brnstein - Group IV 'Physical Chemistry'. It provides data of the ternary system Manganese-Titanium-Zirconium.

Materials Science International Team MSIT

163

Cu-Ti-Zr (Copper-Titanium-Zirconium)  

NASA Astrophysics Data System (ADS)

This document is part of Subvolume C3 'Non-Ferrous Metal Systems. Part 3: Selected Soldering and Brazing Systems' of Volume 11 'Ternary Alloy Systems - Phase Diagrams, Crystallographic and Thermodynamic Data critically evaluated by MSIT' of Landolt-Brnstein - Group IV 'Physical Chemistry'. It provides data of the ternary system Copper-Titanium-Zirconium.

Materials Science International Team MSIT

164

Uniform and Nodule Corrosion of Zirconium Alloys under Service Conditions  

Microsoft Academic Search

Results concerning uniform and nodule (local) corrosion obtained in SF NIKIT are reviewed. The applicability of the electrotechnical theory of high-temperature oxidation of metals to zirconium alloys is analyzed. The conditions of occurrence of nodule corrosion are determined, and the results of a study of process channels and fuel assemblies of RBMK reactors after service at nuclear power plants (NPP)

V. I. Perekhozhev; L. P. Sinel'nikov; A. N. Timokhin; S. A. Averin; M. V. Chernetsov; V. P. Kuznetsov

2003-01-01

165

Preparation and characterization of nanosized zirconium (hydrous) oxide particles  

E-print Network

zirconium salts. Crystal structure, particle size distribution, electrokinetic properties, stability with ultrasound to study their effect on the crystal structure of the calcined samples. I. INTRODUCTION Colloidal vertically into the system placed in a cylindrical cooled container. During the sonication cycle ultrasound

Gleixner, Stacy

166

The corrosion of zirconium under deep geologic repository conditions  

NASA Astrophysics Data System (ADS)

Zirconium alloys are widely used in nuclear reactors as fuel cladding and as reactor structural elements (i.e., CANDU reactor pressure tubes), and are therefore a component of the waste materials that could be emplaced in a deep geologic repository. Therefore, the corrosion mechanisms and rates for relevant zirconium alloys under repository conditions have been reviewed. Since titanium and zirconium alloys have many similarities, and because the data base for the corrosion of titanium alloys under repository conditions is considerably more extensive than that for zirconium alloys, the electrochemical and corrosion behavior of both materials have been compared and evaluated. Although electrochemical studies suggest Zircaloy cladding could be susceptible to pitting, redox conditions within a failed waste container will remain reducing and unable to support pitting. This leaves passive corrosion as the only long-term corrosion mechanism. The available data indicates that the rate of passive corrosion will be very low. A rate of 20 nm/year would be a reasonable upper limit but it is likely the rate will be less than 1 nm/year.

Shoesmith, David W.; Zagidulin, Dmitrij

2011-11-01

167

Polymerization of vinyl aromatic monomers using cyclopentadienyl zirconium catalysts  

SciTech Connect

A process is described for the preparation of polymers of vinyl aromatic monomers having a high degree of syndiotacticity comprising contacting one or more vinyl aromatic monomers under polymerization conditions with a catalyst comprising the reaction product of polymethylaluminoxane and a cyclopentadienyl zirconium (IV) complex.

Schmidt, G.F.; Cambell, R.E. Jr.

1989-02-28

168

Solid State Phase Transformations in Uranium-Zirconium Alloys  

E-print Network

, a basic study on the U-Zr metallurgy was completed using EPMA, DSC, XRD, Optical microscopy, and TEM with a focus on solid state phase transformations in alloys containing 2, 5, 10, 20, 30, and 50wt% zirconium. Alloys were cast by crucible melting...

Irukuvarghula, Sandeep

2013-08-06

169

ZIRCONIUM AND HAFNIUM (Data in metric tons unless otherwise noted)  

E-print Network

include abrasives, chemicals, metal alloys, sandblasting media, and welding rod coatings. The leading,520 1,600 2,260 3,460 Consumption, zirconium ores and concentrates, apparent (ZrO2 content) W W W W W, dollars per kilogram4 137 195 223 235 187 Net import reliance5 as a percentage of apparent consumption

170

CORROSION OF ZIRCONIUM IN CUPRIC AND FERRIC CHLORIDES  

Microsoft Academic Search

The effect of metallurgical and surface treatments on the corrosion ; behavior of arc-melted reactor-grade zirconium in cupric or ferric chloride ; solutions was investigated. An apparatus was constructed and specimens of ; various metallurgical conditions and surface treatments were tested for 6 days at ; 35 deg C, with aeration. Some correlations were observed between corrosion rate ; and

D. J. Stoops; M. D. Carver; H. Kato

1961-01-01

171

N-U-Zr (Nitrogen-Uranium-Zirconium)  

NASA Astrophysics Data System (ADS)

This document is part of Subvolume C4 'Non-Ferrous Metal Systems. Part 4: Selected Nuclear Materials and Engineering Systems' of Volume 11 'Ternary Alloy Systems - Phase Diagrams, Crystallographic and Thermodynamic Data critically evaluated by MSIT' of Landolt-Brnstein - Group IV 'Physical Chemistry'. It provides data of the ternary system Nitrogen-Uranium-Zirconium.

Materials Science International Team MSIT

172

O-U-Zr (Oxygen-Uranium-Zirconium)  

NASA Astrophysics Data System (ADS)

This document is part of Subvolume C4 'Non-Ferrous Metal Systems. Part 4: Selected Nuclear Materials and Engineering Systems' of Volume 11 'Ternary Alloy Systems - Phase Diagrams, Crystallographic and Thermodynamic Data critically evaluated by MSIT' of Landolt-Brnstein - Group IV 'Physical Chemistry'. It provides data of the ternary system Oxygen-Uranium-Zirconium.

Materials Science International Team MSIT

173

Synthesis and characterization of mesoporous zirconium oxide thin films  

NASA Astrophysics Data System (ADS)

Zirconium oxide (ZrO2) has generated wide interest because of its potential in applications such as solid oxide fuel cells, catalysts and optical devices. In these applications, it is important to control the grain size of the material and increase the surface area by introducing porosity with tailored pore size. This paper presents a synthesis route for the preparation of mesoporous zirconia using spin-coating method combined with block copolymer templating evaporation induced self assembly (EISA). The hybrid mesophase was formed by zirconium oxychloride precursor ZrOCl28H2O and Brij 700 poly-ethylene oxide based block copolymer template C18H37(OCH2CH2). FT-IR and Raman measurements of the hybrid mesophase provided information on the possible intermolecular interactions between the precursor and the copolymer template. The results indicate a weak ion-dipole interaction between the inorganic precursor and the organic template after the solvent evaporation, possibly directly between the zirconium and the oxygen of the poly-ethylene oxide chain. The removal of the organic block copolymer by heat treatment resulted in mesoporous zirconia with pore size of ~4-8 nm and crystalline grain size of ~10-17 nm. The morphology in thin films depended significantly on the solvent quality and the block copolymer concentration. Tailoring the surface morphology and the grain size resulted in super-hydrophilic mesoporous zirconia thin films in contrast to water contact angle of 50 on conventional tetragonal zirconium oxide.

Mik, A.; Demirel, A. L.; Somer, M.

2010-06-01

174

STS-97 ISS Science Payloads Briefing  

NASA Technical Reports Server (NTRS)

John Un, International Space Station (ISS) Lead Increment Scientist, gives an overview of the STS-97 Endeavour mission payload (PV Module P6) and Expedition 1 crew. He describes the research and experimentation to take place on the ISS in the following fields: (1) Life Sciences, (2) Microgravity Research, (3) Commercial, (4) Space Sciences, and (5) Earth Sciences. Observations of Earth include images of the Aral Sea in central Asia and fires in Mongolia. Mr. Un then answers questions from the press.

2000-01-01

175

New cholescintigraphic agent: ruthenium-97-DISIDA  

SciTech Connect

These studies demonstrate the first application of Ru-97-DISIDA in human subjects. High quality images were obtained. Scintigraphic findings in patients with hepatobiliary disorders were consistent with the biodistribution data obtained in experinmental animals and with other imaging procedures and clinical findings. Administration of Ru-97-DISIDA I.V. and of a solid test meal labeled with Tc-99m-Sulfur Colloid allowed simulateneous detection and quantification of deodenogastric reflux and determination of the gastric emptying rate. This represents an advantage as compared to the currently used techniques which necessitate two separate studies if a solid meal is used, or would mandate a liquid meal for a simultaneous study. The excellent nuclear decay characteristics of Ru-97 (tl/2 69.6 h, gamma 216 keV, 86%, no betas) permit delayed study of the hepatobiliary system with considerably less radiation exposure than I-131 Rose Bengal and with a marked improvement in image quality. 5 refs., 3 figs., 3 tabs.

Zanzi, I.; Srivastava, S.C.; Meinken, G,E.; Robeson, W.; Mausner, L.F.; Fairchild, R.G.; Margouleff, D.

1986-06-01

176

Removal of Zirconium in Electrometallurgical Treatment of Experimental Breeder Reactor II Spent Fuel  

SciTech Connect

During electrorefining of irradiated, binary U-Zr Experimental Breeder Reactor II fuel, a portion of zirconium is found to dissolve along with uranium. It accumulates in the cadmium pool both as dissolved zirconium and as a zirconium-cadmium intermetallic precipitate. Two electrochemical methods of removing zirconium from the electrorefiner have been evaluated. The first is a three-step method consisting of chemical oxidation of zirconium by CdCl{sub 2} addition, depletion of zirconium from the cadmium pool by electrotransport, and drawdown of zirconium from the LiCl-KCl eutectic salt by using a different electrorefiner configuration. A transport model is employed to determine the cell operating conditions for growing pure zirconium deposits and the throughput rate. The second method eliminates the chemical oxidation step and permits codeposition of uranium and zirconium onto the solid cathode. The transport model is used to assess the level of uranium impurity in the cathode product; an additional step is proposed to reoxidize uranium in the deposit. The two methods are compared from the standpoints of throughput, deposit composition, deposit adherence to a solid cathode mandrel, and the underlying uncertainties. A brief review is given of the related past laboratory work on removal of zirconium from the electrorefiner.

Ahluwalia, Rajesh K.; Hua, Thanh Q.; Geyer, Howard K. [Argonne National Laboratory (United States)

2001-01-15

177

Syntheses and structural characterization of zirconium-tin and zirconium-lead binary and ternary systems  

SciTech Connect

The binary zirconium-tin system was reinvestigated. The A15 phase appears to be a line phase with a Zr{sub 4}Sn composition. The Zr{sub 5}Sn{sub 3} (Mn{sub 5}Si{sub 3}-type) and Zr{sub 5}Sn{sub 4} (Ti{sub 5}Ga{sub 4}-type) compounds are line phases below 1000{degree}C, the latter being a self-interstitial phase of the former. ZrSn{sub 2} is the tin-richest phase. There is an one-phase region between these phases with partial self-interstitials at high temperatures. The zirconium-lead system behaves similarly: there are an A15 phase with a Zr{sub {approximately}5.8}Pb composition, Zr{sub 5}Pb{sub 3} (Mn{sub 5}Si{sub 3}-type) and Zr{sub 5}Pb{sub 4} (Ti{sub 5}Ga{sub 4-type}) compounds, and a high temperature solid solution between Zr{sub 5}Pb{sub >3.5} and Zr{sub 5}Pb{sub 4} from below 1000{degree}C; however, the ZrSn{sub 2} analogue is not formed. The Mn{sub 5}Si{sub 3}-type phases in these systems can accommodate third elements interstitially to form stoichiometric compounds Zr{sub 5}Sn{sub 3}Z (Z = B, C, N, O, Al, Si, P, S, Cu, Zn, Ga, Ge, and As and Se) and Zr{sub 5}Pb{sub 3}Z (Z = Al, Si, P, S, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Ag, Cd, In, Sn, Sb and Te) as well as their self-interstitial derivatives. The systems Zr-Sn-T, T = Fe, Co and Ni, did not produce stoichiometric interstitial phases Zr{sub 5}Sn{sub 3}T. Instead, the interstitial phases for these elements are formed only with excess tin that partially occupies the interstitial site together with a T element. Reducing the amount of tin in these systems yields two new phases; Zr{sub 5}Sn{sub 2+x}Fe{sub 1-x} (0 {le} {times} {le} 0.28) (W{sub 5}Si{sub 3}-type) and Zr{sub 6}Sn{sub 2}Fe (Zr{sub 6}Al{sub 2}Co-type) as characterized by X-ray single crystal analyses. A cobalt analogue for the latter was also synthesized.

Kwon, Y.U.

1991-01-28

178

Investigation of methods for producing reactor-grade zirconium oxide from a zirconium-bearing chloride-sulfate strip liquor solution. Report of investigations/1984  

SciTech Connect

The Bureau of Mines investigated two alternative methods for treating a zirconium-bearing chloride-sulfate strip liquor to obtain reactor-grade ZrO2. One method involves neutralization with NH3 and the other hydrothermal precipitation. The strip liquor was derived from zircon sand by a Bureau of Mines method for separating zirconium and hafnium via solvent extraction with a tertiary amine. Neutralization with NH3 to precipitate hydrous zirconium oxide required 0.9 to 1.1 g NH3 per gram of zirconium. The NH3 can be recovered for recycle. ZrO2 that met reactor-grade specifications was produced by precipitation with NH3. Hydrothermal precipitation of ZrO2 from strip liquor required that the solution be maintained at 260C and 680 psi for 10 min and in a noncorrodible pressure vessel. In bench-scale experiments both methods gave zirconium recoveries greater than 99 pct.

MacDonald, D.J.; Defilippi, C.E.; Henry, H.G.

1984-02-01

179

Nuclear-grade zirconium prepared by combining combustion synthesis with molten-salt electrorefining technique  

NASA Astrophysics Data System (ADS)

Zirconium has a low absorption cross-section for neutrons, which makes it an ideal material for use in nuclear reactor applications. However, hafnium typically contained in zirconium causes it to be far less useful for nuclear reactor materials because of its high neutron-absorbing properties. In the present study, a novel effective method has been developed for the production of hafnium-free zirconium. The process includes two main stages: magnesio-thermic reduction of ZrSiO 4 under a combustion mode, to produce zirconium silicide (ZrSi), and recovery of hafnium-free zirconium by molten-salt electrorefining. It was found that, depending on the electrorefining procedure, it is possible to produce zirconium powder with a low hafnium content: 70 ppm, determined by ICP-AES analysis.

Li, Hui; Nersisyan, Hayk H.; Park, Kyung-Tae; Park, Sung-Bin; Kim, Jeong-Guk; Lee, Jeong-Min; Lee, Jong-Hyeon

2011-06-01

180

Experiments on interactions between zirconium-containing melt and water (ZREX): Hydrogen generation and chemical augmentation of energetics  

SciTech Connect

The results of the first data series of experiments on interactions between zirconium-containing melt and water are described. These experiments involved dropping 1-kg batches of pure zirconium or zirconium-zirconium dioxide mixture melt into a column of water. A total of nine tests were conducted, including four with pure zirconium melt and five with Zr-ZrO{sub 2} mixture melt. Explosions took place only in those tests which were externally triggered. While the extent of zirconium oxidation in the triggered experiments was quite extensive, the estimated explosion energetics were found to be very small compared to the combined thermal and chemical energy available.

Cho, D.H.; Armstrong, D.R.; Gunther, W.H. [Argonne National Lab., IL (United States); Basu, S. [Nuclear Regulatory Commission, Washington, DC (United States)

1997-08-01

181

Hydrogen transport and trapping in EUROFER97  

Microsoft Academic Search

The gas evolution permeation technique has been used to investigate the interaction of hydrogen with the reduced activation ferriticmartensitic steel EUROFER97. The measurements were performed over the temperature range of 376724K with hydrogen driving pressures ranging from 5104 to 1.5105Pa. The resultant diffusive transport parameters are: a diffusivity of D (m2s?1)=4.5710?7exp(?22.3(kJmol?1)\\/RT), a permeability of ? (molm?1Pa?1\\/2s?1)=1.0310?8exp(?37.4(kJmol?1)\\/RT) and a Sieverts constant

G. A. Esteban; A. Pea; I. Urra; F. Legarda; B. Riccardi

2007-01-01

182

Solubility of zirconium in liquid magnesium and the ML5 alloy  

Microsoft Academic Search

1.It was found that zinc, copper, misch metal, and calcium do not affect the solubility of zirconium in magnesium but promote refining of the structure of the Mg-Zr alloy, while nickel, manganese, silicon, tin, aluminum, beryllium, and iron lower the solubility of zirconium and promote coarsening of the structure.A lower solubility of zirconium in magnesium is promoted by elements which

V. M. Babkin

1968-01-01

183

Complexation Chemistry of Zirconium(IV), Uranium(VI), and Iron(III) with Acetohydroxamic Acid  

Microsoft Academic Search

The complexation of zirconium(IV), uranium(VI), and iron(III) with acetohydroxamic acid (AHA) has been analyzed spectrophotometrically in various ionic strengths at 25C. Arsenazo III (AAIII) was used as an indicator for unbound zirconium. The SQUAD computational program was employed to evaluate the stability constants. Conditional stability constants of four zirconium complexes Zr(AAIII), , Zr(AHA), and were determined in 1molL HClO4 as

Brent S. Matteson; Peter Tkac; Alena Paulenova

2010-01-01

184

Alternative Processing of High Temperature Hafnium and Zirconium Based Materials  

NASA Technical Reports Server (NTRS)

The behavior of refractory hafnium and zirconium based materials are being investigated at NASA Ames as part of ongoing research aimed at developing superior heat resistant materials for aerospace applications. Hafnium and zirconium diboride based materials have shown high temperature capabilities in simulated reentry environments indicating that these materials may successfully operate as reusable oxidation resistant components for leading edge applications. Due to the refractory nature of these materials, processing of fine-grained uniform microstructures poses a number of challenges. To better understand the process-property-microstructure relationship, processing of these materials has been carried out with conventional hot pressing in addition to the novel approach of Spark Plasma Sintering (SPS). The two processing methods are compared and contrasted in an evaluation of the sintering behavior of high temperature diboride based materials and preliminary physical and mechanical properties are presented.

Gasch, Matthew; Gusman, Michael; Ellerby, Don; Irby, Edward; Johnson, Sylvia M.

2003-01-01

185

Effects of solutes on damage production and recovery in zirconium  

SciTech Connect

Dilute zirconium-based alloys and pure zirconium were irradiated at 10 K with spallation neutrons at IPNS. Four types of alloys - Zr-Ti, Zr-Sn, Zr-Dy and Zr-Au - each with three concentration levels, were used. Low-temperature resistivity damage rates are enhanced by the presence of any of the four solutes. The greatest enhancement was produced by Au while the least by Dy. Within each alloy group, damage production also increased but at a decreasing rate, with increasing concentration. Post-irradiation annealing experiments, up to 400 K, showed that all four solutes suppress recovery due to interstitial migration, indicative of interstitial trapping by the solutes. Vacancy recovery is also suppressed by the presence of Sn, Dy or Au. The effect of Ti is to shift this stage to lower temperature. No clear correlation between the results with solute size was detected.

Zee, R.H.; Birtcher, R.C.; MacEwen, S.R.; Abromeit, C.

1986-04-01

186

10 CFR 52.97 - Issuance of combined licenses.  

Code of Federal Regulations, 2013 CFR

...Section 52.97 Energy NUCLEAR REGULATORY COMMISSION (CONTINUED) LICENSES, CERTIFICATIONS, AND APPROVALS FOR NUCLEAR POWER PLANTS Combined Licenses 52.97 Issuance of combined licenses. (a)(1) After conducting a...

2013-01-01

187

47 CFR 97.305 - Authorized emission types.  

Code of Federal Regulations, 2011 CFR

...indicated, as authorized to the control operator, subject to the standards specified in 97.307(f) of this part. Wavelength band Frequencies Emission types authorized Standards see 97.307(f), paragraph: MF: 160 m Entire...

2011-10-01

188

29 CFR 97.20 - Standards for financial management systems.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Standards for financial management systems. 97.20 Section...97.20 Standards for financial management systems. (a) A...applicable statutes. (b) The financial management systems of other...

2011-07-01

189

46 CFR 97.16-1 - Use of auto pilot.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Use of auto pilot. 97.16-1 Section...MISCELLANEOUS VESSELS OPERATIONS Auto Pilot 97.16-1 Use of auto pilot. Except as provided...immediately establish manual control of the ship's...

2010-10-01

190

7 CFR 97.3 - Plant Variety Protection Board.  

...2014-01-01 2014-01-01 false Plant Variety Protection Board. 97.3 Section... COMMODITY LABORATORY TESTING PROGRAMS PLANT VARIETY AND PROTECTION Administration 97.3 Plant Variety Protection Board....

2014-01-01

191

46 CFR 111.97-9 - Overcurrent protection.  

Code of Federal Regulations, 2013 CFR

...111.97-9 Section 111.97-9 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems ...

2013-10-01

192

46 CFR 111.97-3 - General requirements.  

Code of Federal Regulations, 2012 CFR

...111.97-3 Section 111.97-3 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems ...

2012-10-01

193

46 CFR 97.30-5 - Accidents to machinery.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Accidents to machinery. 97.30-5 Section...MISCELLANEOUS VESSELS OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment 97.30-5 Accidents to machinery. (a) In the event...

2011-10-01

194

46 CFR 97.30-5 - Accidents to machinery.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Accidents to machinery. 97.30-5 Section...MISCELLANEOUS VESSELS OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment 97.30-5 Accidents to machinery. (a) In the event...

2012-10-01

195

40 CFR 97.357 - Closing of general accounts.  

Code of Federal Regulations, 2010 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.357...and 97.361 for any CAIR NOX Ozone Season allowances in the account to one or more other CAIR NOX Ozone Season Allowance Tracking System...

2010-07-01

196

40 CFR 97.357 - Closing of general accounts.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.357...and 97.361 for any CAIR NOX Ozone Season allowances in the account to one or more other CAIR NOX Ozone Season Allowance Tracking System...

2014-07-01

197

40 CFR 97.357 - Closing of general accounts.  

Code of Federal Regulations, 2011 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.357...and 97.361 for any CAIR NOX Ozone Season allowances in the account to one or more other CAIR NOX Ozone Season Allowance Tracking System...

2011-07-01

198

34 CFR 97.108 - IRB functions and operations.  

Code of Federal Regulations, 2010 CFR

...false IRB functions and operations. 97.108 Section...for Protection of Human Research Subjects) 97.108 IRB functions and operations. In order to fulfill...110), review proposed research at convened...

2010-07-01

199

46 CFR 97.37-23 - Hand portable fire extinguishers.  

Code of Federal Regulations, 2013 CFR

... 2013-10-01 2013-10-01 false Hand portable fire extinguishers. 97.37-23...Emergency Equipment, Etc. 97.37-23 Hand portable fire extinguishers. (a) Each hand portable fire extinguisher shall be...

2013-10-01

200

46 CFR 97.37-23 - Hand portable fire extinguishers.  

Code of Federal Regulations, 2011 CFR

... 2011-10-01 2011-10-01 false Hand portable fire extinguishers. 97.37-23...Emergency Equipment, Etc. 97.37-23 Hand portable fire extinguishers. (a) Each hand portable fire extinguisher shall be...

2011-10-01

201

46 CFR 97.37-23 - Hand portable fire extinguishers.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 2010-10-01 false Hand portable fire extinguishers. 97.37-23...Emergency Equipment, Etc. 97.37-23 Hand portable fire extinguishers. (a) Each hand portable fire extinguisher shall be...

2010-10-01

202

46 CFR 97.37-23 - Hand portable fire extinguishers.  

Code of Federal Regulations, 2012 CFR

... 2012-10-01 2012-10-01 false Hand portable fire extinguishers. 97.37-23...Emergency Equipment, Etc. 97.37-23 Hand portable fire extinguishers. (a) Each hand portable fire extinguisher shall be...

2012-10-01

203

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...BOARD SUCH AIRCRAFT Special Federal Aviation Regulation No. 97 Editorial...

2010-01-01

204

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...AND REPORTING POINTS Special Federal Aviation Regulation No. 97 Editorial...

2011-01-01

205

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...SUPPLEMENTAL OPERATIONS Special Federal Aviation Regulation No. 97 Editorial...

2011-01-01

206

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...IN COMMON CARRIAGE Special Federal Aviation Regulation No. 97 Editorial...

2010-01-01

207

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...AND REPORTING POINTS Special Federal Aviation Regulation No. 97 Editorial...

2010-01-01

208

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...BOARD SUCH AIRCRAFT Special Federal Aviation Regulation No. 97 Editorial...

2011-01-01

209

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2011 CFR

...2011-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...IN COMMON CARRIAGE Special Federal Aviation Regulation No. 97 Editorial...

2011-01-01

210

14 CFR Appendix - Special Federal Aviation Regulation No. 97  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Special Federal Aviation Regulation No. 97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION...SUPPLEMENTAL OPERATIONS Special Federal Aviation Regulation No. 97 Editorial...

2010-01-01

211

30 CFR 18.97 - Inspection of machines; minimum requirements.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 false Inspection of machines; minimum requirements. 18.97...Equipment 18.97 Inspection of machines; minimum requirements. (a) Except as provided in 18.95, all machines approved under the...

2012-07-01

212

30 CFR 18.97 - Inspection of machines; minimum requirements.  

...2014-07-01 false Inspection of machines; minimum requirements. 18.97...Equipment 18.97 Inspection of machines; minimum requirements. (a) Except as provided in 18.95, all machines approved under the...

2014-07-01

213

30 CFR 18.97 - Inspection of machines; minimum requirements.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Inspection of machines; minimum requirements. 18.97...Equipment 18.97 Inspection of machines; minimum requirements. (a) Except as provided in 18.95, all machines approved under the...

2011-07-01

214

30 CFR 18.97 - Inspection of machines; minimum requirements.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 false Inspection of machines; minimum requirements. 18.97...Equipment 18.97 Inspection of machines; minimum requirements. (a) Except as provided in 18.95, all machines approved under the...

2013-07-01

215

40 CFR 97.51 - Establishment of accounts.  

... 97.51 Section 97.51 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...i) or (ii) of this section, no objection or other communication submitted to the Administrator concerning the...

2014-07-01

216

46 CFR 97.30-5 - Accidents to machinery.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Accidents to machinery. 97.30-5 Section...MISCELLANEOUS VESSELS OPERATIONS Reports of Accidents, Repairs, and Unsafe Equipment 97.30-5 Accidents to machinery. (a) In the event...

2010-10-01

217

28 CFR 97.24 - No civil defense created.  

Code of Federal Regulations, 2010 CFR

... 2010-07-01 false No civil defense created. 97.24 Section...DETAINEE SERVICES 97.24 No civil defense created. The regulations...companies are not intended to create a defense to any civil action, whether...

2010-07-01

218

28 CFR 97.24 - No civil defense created.  

Code of Federal Regulations, 2011 CFR

... 2011-07-01 false No civil defense created. 97.24 Section...DETAINEE SERVICES 97.24 No civil defense created. The regulations...companies are not intended to create a defense to any civil action, whether...

2011-07-01

219

7 CFR 3201.97 - Sun care products.  

Code of Federal Regulations, 2013 CFR

...2013-01-01 2013-01-01 false Sun care products. 3201.97 Section 3201...PROCUREMENT Designated Items 3201.97 Sun care products. (a) Definition. Products including sunscreens, sun blocks, and suntan lotions that are...

2013-01-01

220

29 CFR 97.20 - Standards for financial management systems.  

...true Standards for financial management systems. 97.20 Section 97...20 Standards for financial management systems. (a) A State must...statutes. (b) The financial management systems of other grantees and...

2014-07-01

221

Solvent extraction separation of zirconium (IV) with amberlite LA-1 from citrate solutions  

SciTech Connect

Zirconium was extracted as its anionic complex with various mineral acids by liquid anion exchanger. The chlorocomplex of zirconium was extracted from 6-10 M hydrochloric acid with trioctylamine, triisooctylamine or Aliquat 3365. The sulphotocomplex of zirconium was extracted with Aliquat 3365, Primine JMT, Alamine 336. The nitratocomplex was less extensively utilised for the extractive separation of zirconium. Zirconium was extracted quantitatively from oxalate and malonate media. These extractions were carried out at low pH and separated zirconium from large number of associated elements. The ion exchange chromatographic behaviour of zirconium on column with cation exchange or with anion exchange resin with citric acid as eluent were utilised but extraction studies from citrate solutions were never attempted. From the critical study of existing methods it was observed that zirconium was extracted at narrow pH range; with high concentration of complexing ligand for extraction with liquid anion exchangers and long period of equilibration for extraction as well as stripping. So also such extractions were possible mostly at milligram concentrations involving use of hazardous diluents like benzene. Therefore this paper presented systematic investigations on the solvent extraction separation of zirconium from citrate media with liquid anion exchangers.

Vibhute, C.P.; Khopkar, S.M.

1983-09-01

222

Oxidation characteristics of molybdenum-zirconium oxide cermets  

NASA Technical Reports Server (NTRS)

The oxidation of molybdenum is affected by the factors of temperature, the oxygen pressure in the oxidizing atmosphere, and the time of exposure. Studies of the oxidation characteristics of Mo show that the oxidation rate increases strongly when the temperature exceeds 600 C. Investigations of the behavior of cermets with various percentages of zirconium oxide are discussed, taking into account oxidation conditions at temperatures under and above the melting point of molybdenum trioxide.

Heitzinger, B.

1984-01-01

223

Polyimide nanocomposites based on cubic zirconium tungstate  

NASA Astrophysics Data System (ADS)

In this research, cubic zirconium tungstate (ZrW2O8) was used as a filler to reduce the CTE of polyimides (PI), and the effect of ZrW2O8 nanoparticles on the bulk polymer properties was studied. Polyimides are high performance polymers with exceptional thermal stability, and there is a need for PIs with low CTEs for high temperature applications. The nanofiller, cubic ZrW2O8, is well known for its isotropic negative thermal expansion (NTE) over a wide temperature range from -272.7 to 777C. The preparation of nanocomposites involved the synthesis of ZrW 2O8 nanofiller, engineering the polymer-filler interface using linker groups and optimization of processing strategies to prepare free-standing PI nanocomposite films. A hydrothermal method was used to synthesize ZrW 2O8 nanoparticles. Polyimide-ZrW2O8 interface interaction was enhanced by covalently bonding linker moieties to the surface of ZrW2O8 nanoparticles. Specifically, ZrW 2O8 nanoparticles were functionalized with two different linker groups: (1) a short aliphatic silane, and (2) low molecular weight PI. The surface functionalization was confirmed using X-ray photoelectron spectroscopy and thermal gravimetric analysis (TGA). Reprecipitation blending was used to prepare the freestanding PI-ZrW2O8 nanocomposite films with up to 15 volume% filler loading. SEM images showed the improvements in polymer-filler wetting behavior achieved using interface engineering. SEM images indicated that there was better filler dispersion in the PI matrix using reprecipitation blending, compared to the filler dispersion achieved in the nanocomposites prepared using conventional blending technique. The structure-property relationships in PI-ZrW2O8 nanocomposites were investigated by studying the thermal degradation, glass transition, tensile and thermal expansion properties of the nanocomposites. The properties were studied as a function of filler loading and interface linker groups. Addition of ZrW2O8 nanoparticles did not alter the thermal degradation and glass transition temperatures of the base PI. The addition of ZrW2O8 nanoparticles increased the Young's modulus of the polymer, indicating the stiffening of polyimide matrix. The modulus showed a steady increase with increase in filler loading. The increase was higher for nanocomposites with engineered interface due to the efficient load transfer achieved through the presence of linker groups. The strain at yield and the tensile strength decreased with the addition of ZrW2O8. The experimental results for the moduli of nanocomposites were compared with moduli predicted using theoretical models. The results for the nanocomposites with unmodified ZrW2O8 followed Hashin-Shtrikman (H-S) lower bound, which showed the presence of mechanical interactions between the polymer and filler. The moduli for nanocomposites with engineered interface fell between the H-S bounds, demonstrating the stiffening of PI matrix through efficient load transfer. The addition of ZrW2O8 reduced the in-plane CTE of the base PI at all loadings. The CTE of the nanocomposites decreased steadily with an increase in the filler loading. With the addition of 15 volume% APT-ZrW 2O8, the CTE of the base PI reduced from 64.3 +/- 1.3 ppm/C to 51.9 +/- 0.9 ppm/C. In other words, the CTE of the base PI was reduced by around 22% with the addition of ZrW2O 8 at 15 volume% loading. The CTE values were comparable for all samples at similar loadings irrespective of the interface groups. The experimental results for the CTEs of nanocomposites were compared with CTEs predicted using theoretical models. The data followed the Schapery upper bound, which was consistent with the results observed for the moduli data. The effect of ZrW2O8 particle size on the bulk properties of the polyimide was also investigated. The CTE of composites with micron particles at 5 volume% was comparable to that obtained for nanocomposites at the same filler loading. But, there were significant differences in the mechanical strength of composites. PI composites with ZrW2O 8 micron particles were extre

Ramasubramanian Sharma, Gayathri

224

Quantitative EELS analysis of zirconium alloy metal/oxide interfaces.  

PubMed

Zirconium alloys have been long used for fuel cladding and other structural components in water-cooled nuclear reactors, but waterside corrosion is a primary limitation on both high fuel burn-up and extended fuel cycle operation. Understanding the processes that occur at the metal/oxide interface is crucial for a full mechanistic description of the oxidation process. In this paper we show that reliable quantification of the oxygen content at the metal/oxide interface can be obtained by Electron Energy Loss Spectrometry (EELS) if enough care is taken over both the preparation of Transmission Electron Microscopy (TEM) samples and the methodology for quantification of the EELS data. We have reviewed the accuracy of theoretically calculated inelastic partial scattering cross-sections and effective inelastic mean-free-paths for oxygen and zirconium in oxidized Zr-alloy samples. After careful recalibration against a ZrO? powder standard, systematic differences in the local oxygen profile across the interface in different zirconium alloys were found. The presence of a sub-stoichiometric oxide layer (a suboxide) was detected under conditions of slow oxide growth but not where growth was more rapid. This difference could arise from the different corrosion resistances of the alloys or, more likely, as a result of the transition in oxidation behaviour, which refers to a sharp increase in the oxidation rate when the oxide is a few microns thick. PMID:21185456

Ni, Na; Lozano-Perez, Sergio; Sykes, John; Grovenor, Chris

2011-01-01

225

27 CFR 26.97 - Marking containers of wine.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Marking containers of wine. 26.97 Section 26.97 Alcohol, Tobacco...Taxpayment of Liquors and Articles in Puerto Rico Wine 26.97 Marking containers of wine. Containers of wine of Puerto Rican...

2010-04-01

226

47 CFR 97.309 - RTTY and data emission codes.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 false RTTY and data emission codes. 97.309 Section 97.309 Telecommunication...Standards 97.309 RTTY and data emission codes. (a) Where authorized by...emission using the following specified digital codes: (1) The 5-unit,...

2013-10-01

227

47 CFR 97.309 - RTTY and data emission codes.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false RTTY and data emission codes. 97.309 Section 97.309 Telecommunication...Standards 97.309 RTTY and data emission codes. (a) Where authorized by...emission using the following specified digital codes: (1) The 5-unit,...

2012-10-01

228

47 CFR 97.309 - RTTY and data emission codes.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false RTTY and data emission codes. 97.309 Section 97.309 Telecommunication...Standards 97.309 RTTY and data emission codes. (a) Where authorized by...emission using the following specified digital codes: (1) The 5-unit,...

2011-10-01

229

47 CFR 97.309 - RTTY and data emission codes.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false RTTY and data emission codes. 97.309 Section 97.309 Telecommunication...Standards 97.309 RTTY and data emission codes. (a) Where authorized by...emission using the following specified digital codes: (1) The 5-unit,...

2010-10-01

230

29 CFR 1915.97 - Health and sanitation.  

Code of Federal Regulations, 2010 CFR

... 7 2010-07-01 2010-07-01 false Health and sanitation. 1915.97 Section 1915.97 Labor Regulations Relating...EMPLOYMENT General Working Conditions 1915.97 Health and sanitation. The provisions of this section shall apply to ship...

2010-07-01

231

29 CFR 1915.97 - Health and sanitation.  

Code of Federal Regulations, 2011 CFR

... 7 2011-07-01 2011-07-01 false Health and sanitation. 1915.97 Section 1915.97 Labor Regulations Relating...EMPLOYMENT General Working Conditions 1915.97 Health and sanitation. The provisions of this section shall apply to ship...

2011-07-01

232

46 CFR 97.37-47 - Portable magazine chests.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Portable magazine chests. 97.37-47 Section 97.37-47 Shipping...Equipment, Etc. 97.37-47 Portable magazine chests. (a) Portable magazine chests shall be marked in letters at least 3 inches...

2010-10-01

233

The CMUnited-97 Simulator Team Peter Stone and Manuela Veloso  

E-print Network

. The Soccer Server system provides a rich and challenging multiagent, real-time domain. Agents must accurately~pstone,~mmvg In RoboCup-97: Robot Soccer World Cup I, H. Kitano ed., 1998. Springer Verlag, Berlin. Abstract- nals of the 29-team RoboCup-97 tournament. 1 Introduction The Soccer Server system 5 used at RoboCup-97

Stone, Peter

234

47 CFR 97.11 - Stations aboard ships or aircraft.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 false Stations aboard ships or aircraft. 97.11 Section 97...Provisions 97.11 Stations aboard ships or aircraft. (a) The installation and operation of an amateur station on a ship or aircraft must be approved by the...

2013-10-01

235

47 CFR 97.11 - Stations aboard ships or aircraft.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Stations aboard ships or aircraft. 97.11 Section 97...Provisions 97.11 Stations aboard ships or aircraft. (a) The installation and operation of an amateur station on a ship or aircraft must be approved by the...

2011-10-01

236

47 CFR 97.11 - Stations aboard ships or aircraft.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Stations aboard ships or aircraft. 97.11 Section 97...Provisions 97.11 Stations aboard ships or aircraft. (a) The installation and operation of an amateur station on a ship or aircraft must be approved by the...

2010-10-01

237

47 CFR 97.11 - Stations aboard ships or aircraft.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Stations aboard ships or aircraft. 97.11 Section 97...Provisions 97.11 Stations aboard ships or aircraft. (a) The installation and operation of an amateur station on a ship or aircraft must be approved by the...

2012-10-01

238

The Indigenous World, 1996-97 = El Mundo Indigena, 1996-97.  

ERIC Educational Resources Information Center

This annual publication (published separately in English and Spanish) examines political, legal, social, and educational issues concerning indigenous peoples around the world during 1996-97. Part I highlights news events and ongoing situations in specific countries. In North America, these include threats of proposed oil drilling on sacred sites

Erni, Christian, Ed.

239

WFPC2 Instrument Science Report 97-031 Summary of WFPC2 SM97 Plans  

E-print Network

, the HST will be held in a Bright Earth Avoidance (BEA) orientation during the first 10 days after HST 3 Calibration Proposals 6 4 Timeline for WFPC2 SMOV Activities 19 5 Data Analysis Teams 25 6 Targets for Bright Earth Avoidance 26 7 References 28 #12;3 2. Goals of the WFPC2 SM97 Plan The main goals of the SM

Sirianni, Marco

240

Growth of thin zirconium and zirconium oxides films on the n-GaN(0 0 0 1) surface studied by XPS and LEED  

NASA Astrophysics Data System (ADS)

This work presents the result of the growth of thin zirconium films on the GaN(0 0 0 1) surface under various conditions. In experiment were used the X-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) techniques, which allowed to investigate the chemical composition, bonding environment and surface reconstruction. It is shown that zirconium forms ZrN, ZrNxOy, ZrOx and ZrO2 compounds, depending on the selected experimental conditions: the pressure and annealing temperature. Such a varied zirconium growth behaviour is explained by the diffusion of oxygen and nitrogen in the created interface region.

Idczak, K.; Mazur, P.; Zuber, S.; Markowski, L.; Ski?cim, M.; Bili?ska, S.

2014-06-01

241

Zirconium oxidation under high energy heavy ion irradiation N. Brerd, A. Chevarier, N. Moncoffre, H. Jaffrezic,  

E-print Network

Zirconium oxidation under high energy heavy ion irradiation N. Bérerd, A. Chevarier, N. Moncoffre This paper concerns the study of zirconium oxidation under irradiation with high energetic Xe ions oxidation data. 1 #12;I. INTRODUCTION This paper deals with the influence of heavy ion irradiation

Paris-Sud XI, Université de

242

Phase-field simulation of hydride precipitation in bi-crystalline zirconium  

E-print Network

the precipitation process, different variants are arranged in such a way that the free energy is minimized. The aPhase-field simulation of hydride precipitation in bi-crystalline zirconium X.Q. Ma a , S.Q. Shi a Abstract The morphological evolution of c-hydride precipitation and growth in a zirconium bi

Chen, Long-Qing

243

Solid-State Coexistance of (Zr12) and (Zr6) Zirconium Oxocarboxylate Clusters  

SciTech Connect

Ligand metathesis, Co(II) coordination, and partial condensation reactions of an archetypal {Zr6} zirconium oxocarboxylate cluster result in the first example of the coexistence of the distinct zirconium oxide frameworks {Zr6O8} and {Zr12O22}. Even minor modifications to the reaction conditions push this apparent equilibrium towards the {Zr6O8}-based product.

Malaestean, Lurie [RWTH Aachen University; Alici, Meliha Kutluca [RWTH Aachen University; Besson, Claire [RWTH Aachen University; Ellern, Arkady [Ames Laboratory; Kogerler, Paul [RWTH Aachen University

2013-10-30

244

Solid-state coexistence of {Zr12} and {Zr6} zirconium oxocarboxylate clusters  

SciTech Connect

Ligand metathesis, Co(II) coordination, and partial condensation reactions of an archetypal {Zr6} zirconium oxocarboxylate cluster result in the first example of the coexistence of the distinct zirconium oxide frameworks {Zr6O8} and {Zr12O22}. Even minor modifications to the reaction conditions push this apparent equilibrium towards the {Zr6O8}-based product.

Malaestean, Iurie L. [RWTH Aachen University; Alici, Meliha Kutluca [RWTH Aachen University; Besson, Claire [RWTH Aachen University; Ellern, Arkady [Ames Laboratory; Kogerler, Paul [RWTH Aachen University

2013-10-30

245

Zirconium carbide as an electrocatalyst for the chromous-chromic redox couple  

NASA Technical Reports Server (NTRS)

Zirconium carbide is used as a catalyst in a REDOX cell for the oxidation of chromous ions to chromic ions and for the reduction of chromic ions to chromous ions. The zirconium carbide is coated on an inert electronically conductive electrode which is present in the anode fluid of the cell.

Gahn, R. F.; Reid, M. A.; Yang, C. Y. (inventors)

1981-01-01

246

A STUDY OF METAL IGNITIONS. II. THE SPONTANEOUS IGNITION OF ZIRCONIUM  

Microsoft Academic Search

Spontaneous ignition of zirconium sheets, varying in thickness from ; 0.0l0 to 0.250 in., can occur by exposing it rapidly to oxygen under pressure. ; The ignition limits, in terms of oxygen pressure and concentration, necessary to ; produce spontaneous ignition, were determined for zirconium and Zircaloy. ; lgnition resulting from the breaking of 1\\/4 in. bars (in tension) was

F. E. Littman; F. M. Church; E. M. Kinderman

1961-01-01

247

Synthesis and Structural Determination of a Hexanuclear Zirconium Glycine Compound Formed in Aqueous Solution  

E-print Network

, and Latonya Kilpatrick Colgate-PalmoliVe Company, 909 RiVer Road Piscataway, New Jersey 08854, Department no skeleton electrons. The zirconium-aluminum-glycine (ZAG) complex is an efficacious antiperspirant salt of the ZAG salt. Furthermore, knowing the structure of zirconium-amino acid complexes should help chemists

Li, Jing

248

Lithium aluminate/zirconium material useful in the production of tritium  

DOEpatents

A composition is described useful in the production of tritium in a nuclear eactor. Lithium aluminate particles are dispersed in a matrix of zirconium. Tritium produced by the reactor of neutrons with the lithium are absorbed by the zirconium, thereby decreasing gas pressure within capsules carrying the material.

Cawley, William E. (Richland, WA); Trapp, Turner J. (Richland, WA)

1984-10-09

249

Preparation of lead-zirconium-titanium film and powder by electrodeposition  

Microsoft Academic Search

A process is disclosed for the preparation of lead-zirconium-titanium (PZT) film and powder compositions. The process comprises the steps of providing an electrodeposition bath, providing soluble salts of lead, zirconium and titanium metals to this bath, electrically energizing the bath to thereby direct ions of each respective metal to a substrate electrode and cause formation of metallic particles as a

R. N. Bhattacharya; D. S. Ginley

1995-01-01

250

Preparation of lead-zirconium-titanium film and powder by electrodeposition  

Microsoft Academic Search

A process for the preparation of lead-zirconium-titanium (PZT) film and powder compositions. The process comprises the steps of providing an electrodeposition bath, providing soluble salts of lead, zirconium and titanium metals to this bath, electrically energizing the bath to thereby direct ions of each respective metal to a substrate electrode and cause formation of metallic particles as a recoverable film

Raghu N. Bhattacharya; David S. Ginley

1995-01-01

251

Manganese porphyrin multilayer films assembled on ITO electrodes via zirconium phosphonate chemistry: chemical and electrochemical  

E-print Network

Manganese porphyrin multilayer films assembled on ITO electrodes via zirconium phosphonate University, 2145 Sheridan Road, Evanston, IL 60208-3113 A supported manganese porphyrin-based oxidation)porphyrinato] manganese(III) chloride (2) and zirconium(IV) ions on indium�tin oxide electrodes. This assembly technique

252

Lithium aluminate/zirconium material useful in the production of tritium  

DOEpatents

A composition is described useful in the production of tritium in a nuclear reactor. Lithium aluminate particles are dispersed in a matrix of zirconium. Tritium produced by the reactor of neutrons with the lithium are absorbed by the zirconium, thereby decreasing gas pressure within capsules carrying the material.

Cawley, W.E.; Trapp, T.J.

1984-10-09

253

Predicting the equilibria of point defects in zirconium oxide : a route to understand the corrosion and hydrogen pickup of zirconium alloys  

E-print Network

The performance of zirconium alloys in nuclear reactors is compromised by corrosion and hydrogen pickup. The thermodynamics and kinetics of these two processes are governed by the behavior of point defects in the ZrO? layer ...

Youssef, Mostafa Youssef Mahmoud

2014-01-01

254

Fused salt process for purifying zirconium and/or hafnium tetrachlorides  

SciTech Connect

This patent describes a fused salt process for continuously purifying zirconium and/or hafnium tetrachloride dissolved in a molten bath in a vessel. It comprises: maintaining a mass of a suitable mixture of salts, including zirconium and/or hafnium tetrachloride; heating the mixture of salts to a temperature at or immediately below the vaporization temperature of the zirconium and/or hafnium tetrachloride at which temperature the mixture of salts is fused to form a molten, tetrachloride-dissolving bath; continuously introducing into the dissolving bath a zirconium and/or hafnium tetrachloride powder; heating a portion of the dissolving bath in situ to a temperature higher than the vaporization temperature of the zirconium and/or hafnium tetrachloride so as to vaporize the tetrachloride; internally circulating the dissolving bath whereby the portion of the dissolving bath at the high temperature circulate with the bath at the lower temperature.

Lee, E.D.

1991-04-23

255

Fundamental studies into zirconium modified phosphonic acid based ionic membranes  

NASA Astrophysics Data System (ADS)

The demand for a sustainable energy economy requires the development of new solid stare electrochemical energy conversion devices. Ionic membranes are the bases for most of these devices. Solid super acids based on zirconium phosphonates show great promise for development into these membranes. Copolymers of vinyl phosphonic acid with zirconium vinyl phosphonate have been synthesized via UV free radical polymerization from immiscible mixtures into amorphous, transparent, water stable, flexible membranes. Ion exchange capacities range from 6 to 10 meq/g corresponding to equivalent weights well below 200 g/mol. A 20wt% loading of the VZP co-monomer is XRD amorphous. It is shown that 1.5 of the 2 protons in the beginning acidic groups are dissociated in the 20wt% VZP loaded ionomer allowing these materials to have high proton conductivities, up to and exceeding 0.1 S cm^-1 at 80C and 80%RH. Water uptake measurementsshow very little swelling of the material below 70%RH and ca. 1 water per proton at low RH. Proton conductivity under dry conditions, roughly 0.05 S cm-1 with a lambda < 1, indicates that the material conducts protons under limiting hydration conditions and strongly implicates transport by a pure Grotthuss mechanism. Through this work, it has been demonstrated that zirconium vinyl phosphonate can, in fact, be dispersed and incorporated into a polymer to create new, hybrid organic-inorganic ionomers. High conductivities over 0.15 S/cm have been shown for multiple formulations of these ionomers, which is approaching conductivities that are comparable to liquid and molten phosphoric and phosphonic acids. Phosphonic acid functionalization yielded high proton conductivities, however the increased ionic character rendered the ionomer vulnerable to attack from water. Annealing provides a rise in conductivity at 150 degrees Celsius, but shows decreases after heating to 175 degrees Celsius, where the ionomer is obviously starting to degrade.

Schlichting, Gregory Joseph

256

Transjugular Liver Biopsy: Results of 97 Patients  

PubMed Central

Objective: To evaluate the feasibility and efficacy of transjugular liver biopsy in patients with contraindicated percutaneous biopsy. Materials and Methods: Between June 2005 and April 2010, 97 patients who were admitted for transjugular liver biopsy were enrolled in this retrospective study. All liver biopsies were obtained using an 18 gauge Quick-Core liver biopsy set through the right hepatic vein via the internal jugular vein. Clinical indication, histopathological diagnosis, and complications were noted. Results: Primary technical success was achieved in 93 (95.8%) patients. Hepatic veins could not be catheterized and opacified in two patients and in the remaining two patients the veins could be opacified and catheterized but we were not able to pass the biopsy needle into the hepatic vein because of the acute angle between the inferior vena cava and hepatic veins. At least two specimens were obtained from each patient. The most frequent histopathological diagnosis was cirrhosis. A subcutaneous hematoma around the puncture side was encountered in one patient. Conclusion: Transjugular liver biopsy is a feasible and effective alternative in patients with contraindication for percutaneous biopsy.

Donmez, Halil; Kahriman, Guven; Ozcan, Nevzat; Mavili, Ertugrul; Deniz, Kemal

2012-01-01

257

Fast-neutron scattering cross sections of elemental zirconium  

SciTech Connect

Differential neturon-elastic-scattering cross sections of elemental zirconium are measured from 1.5 to 4.0 MeV at intervals of less than or equal to 200 keV. Inelastic-neutron-scattering cross sections corresponding to the excitation of levels at observed energies of: 914 +- 25, 1476 +- 37, 1787 +- 23, 2101 +- 26, 2221 +- 17, 2363 +- 14, 2791 +- 15 and 3101 +- 25 keV are determined. The experimental results are interpreted in terms of the optical-statistical model and are compared with corresponding quantities given in ENDF/B-V.

Smith, A.B.; Guenther, P.T.

1982-12-01

258

Bulk Hydrides and Delayed Hydride Cracking in Zirconium Alloys  

NASA Astrophysics Data System (ADS)

Zirconium alloys are susceptible to engineering problems associated with the uptake of hydrogen throughout their design lifetime in nuclear reactors. Understanding of hydrogen embrittlement associated with the precipitation of brittle hydride phases and a sub-critical crack growth mechanism known as Delayed Hydride Cracking (DHC) is required to provide the engineering justifications for safe reactor operation. The nature of bulk zirconium hydrides at low concentrations (< 100 wt. ppm) is subject to several contradictory descriptions in the literature associated with the stability and metastability of gamma-phase zirconium hydride. Due to the differing volume expansions (12-17%) and crystallography between gamma and delta hydride phases, it is suggested that the matrix yield strength may have an effect on the phase stability. The present work indicated that although yield strength can shift the phase stability, other factors such as microstructure and phase distribution can be as or more important. This suggests that small material differences are the reason for the literature discrepancies. DHC is characterised by the repeated precipitation, growth, fracture of brittle hydride phases and subsequent crack arrest in the ductile metal. DHC growth is associated primarily the ability of hydrogen to diffuse under a stress induced chemical potential towards a stress raiser. Knowledge of the factors controlling DHC are paramount in being able to appropriately describe DHC for engineering purposes. Most studies characterise DHC upon cooling to the test temperature. DHC upon heating has not been extensively studied and the mechanism by which it occurs is somewhat controversial in the literature. This work shows that previous thermo-mechanical processing of hydrided zirconium can have a significant effect on the dissolution behaviour of the bulk hydride upon heating. DHC tests with gamma-quenched, furnace cooled-delta and reoriented bulk hydrides upon heating and DHC upon cooling suggest that the amount of hydrogen in solution is the primary factor controlling the occurrence of DHC and consistent with the postulation that the stress induced chemical potential is the driving force for DHC.

Tulk, Eric F.

259

The Banff 97 working classification of renal allograft pathology  

Microsoft Academic Search

The Banff 97 working classification of renal allograft pathology.BackgroundStandardization of renal allograft biopsy interpretation is necessary to guide therapy and to establish an objective end point for clinical trials. This manuscript describes a classification, Banff 97, developed by investigators using the Banff Schema and the Collaborative Clinical Trials in Transplantation (CCTT) modification for diagnosis of renal allograft pathology.MethodsBanff 97 grew

LORRAINE C. RACUSEN; KIM SOLEZ; ROBERT B. COLVIN; STEPHEN M. BONSIB; MARIA C. CASTRO; TITO CAVALLO; BYRON P. CROKER; A. JAKE DEMETRIS; CYNTHIA B. DRACHENBERG; AGNES B. FOGO; PETER FURNESS; LILLIAN W. GABER; IAN W. GIBSON; DENNIS GLOTZ; JULIO C. GOLDBERG; JOSEPH GRANDE; PHILIP F. HALLORAN; H. E. HANSEN; BARRY HARTLEY; PEKKA J. HAYRY; CLAIRE M. HILL; ERNESTO O. HOFFMAN; LAWRENCE G. HUNSICKER; ANNE S. LINDBLAD; NIELS MARCUSSEN; MICHAEL J. MIHATSCH; TIBOR NADASDY; PETER NICKERSON; T. STEEN OLSEN; JOHN C. PAPADIMITRIOU; PARMJEET S. RANDHAWA; DAVID C. RAYNER; IAN ROBERTS; STEPHEN ROSE; DAVID RUSH; LUIS SALINAS-MADRIGAL; DANIEL R. SALOMON; STALE SUND; EERO TASKINEN; KIRIL TRPKOV; YUTAKA YAMAGUCHI

1999-01-01

260

47 CFR 97.115 - Third party communications.  

Code of Federal Regulations, 2011 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...97.115 Third party communications. (a) An amateur...government when transmitting emergency or disaster relief communications and any station...

2011-10-01

261

47 CFR 97.115 - Third party communications.  

Code of Federal Regulations, 2013 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...97.115 Third party communications. (a) An amateur...government when transmitting emergency or disaster relief communications and any station...

2013-10-01

262

47 CFR 97.115 - Third party communications.  

Code of Federal Regulations, 2012 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...97.115 Third party communications. (a) An amateur...government when transmitting emergency or disaster relief communications and any station...

2012-10-01

263

47 CFR 97.115 - Third party communications.  

Code of Federal Regulations, 2010 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...97.115 Third party communications. (a) An amateur...government when transmitting emergency or disaster relief communications and any station...

2010-10-01

264

Analysis of uranium-zirconium-carbon-oxygen quaternary system for applications in advanced zirconium carbide coated TRISO particles  

NASA Astrophysics Data System (ADS)

The implementation of ZrC for use in oxide TRISO particles for Very High Temperature Reactor (VHTR) conditions to prevent kernel overpressurization and kernel migration has been proposed by several researchers. Analysis is performed incorporating first-principles thermodynamics along with out-of-pile experimental work. UO2+x-U4O9 powders are created and used for in-vacuo thermogravimetric testing with both carbon and zirconium carbide powders to evaluate the efficiency of ZrC for usage as an oxygen getter in oxide TRISO fuels.

Degange, Jonathan Lee

265

Radiation induced creep and growth of zirconium alloys  

NASA Astrophysics Data System (ADS)

The strain under irradiation of zirconium and its alloys is calculated within a simple rate theory approach. Network dislocations and interstitial dislocation loops with their Burgers vector oriented parallel to the crystal basal plane are assumed to climb by preferentially attracting interstitials with respect to vacancies, while the grain boundaries act as neutral sinks and absorb therefore more vacancies than interstitials. This same theory has been applied by Fainstein-Pedraza, Savino and Pedraza for modelling the irradiation growth of cold worked zirconium alloys. It is now extended by including the effect of vacancy traps and the stress induced preferential bias for interstitials of those dislocations favourably oriented with respect to an external or internal stress field. In addition, a model which allows to correlate the deformation of the individual grains with the strain of the polycrystalline specimen where they pertain is developed. The stresses induced within the same grain while it deforms inside the textured crystal are also numerically calculated. Those stresses modify the grain strain via the SIPA mechanism and the stresses-strains are then coupled. The calculated crystal deformation is strongly dependent on texture. For tubes with the c axis oriented preferentially on an axial plane, a rapid increase of the longitudinal strain rate is predicted at high doses.

Savino, E. J.; Laciana, C. E.

1980-05-01

266

Retrospective Reactor Dosimetry with Zirconium Alloy Samples in a Pwr  

NASA Astrophysics Data System (ADS)

Retrospective measurements are routinely performed with stainless steel samples. Recent experiments have been successfully conducted using zirconium alloy samples, involving somewhat different neutron activation reactions than are normally encountered with stainless steel samples. The sample alloy compositions consisted of ZIRLO which nominally contains about 1.0% (by weight) niobium, 0.65-1.0% tin, and 0.1% iron, with the balance zirconium. The activation products observed in the samples by gamma spectroscopy included Zr-95, Nb-93m, Nb-95, Sn-113, Sb-125, Mn-54, Co-60, Nb-94, and Ta-182. The niobium was then chemically separated following ASTM procedure El297 and the Nb-93m activities were measured by x-ray spectroscopy. The thermal neutron fluences, as determined independently by the neutron capture gamma reactions to Zr-95, Sn-113, Nb-94, and Sn/Sb-125, were in excellent agreement. The fast neutron fluences, as determined separately by the Fe-54(n,p)Mn-54 and Nb-93(n,n')Nb-93m reactions, were also in good agreement, thus demonstrating the versatility of the retrospective dosimetry technique. The results were used to experimentally determine the fast and thermal fluxes in the Vogtle unit 2 PWR.

Greenwood, L. R.; Foster, J. P.

2009-08-01

267

Green strength of zirconium sponge and uranium dioxide powder compacts  

SciTech Connect

Zirconium metal sponge is compacted into rectangular or cylindrical shapes using hydraulic presses. These shapes are stacked and electron beam welded to form a long electrode suitable for vacuum arc melting and casting into solid ingots. The compact electrodes should be sufficiently strong to prevent breakage in handling as well as during vacuum arc melting. Usually, the welds are strong and the electrode strength is limited by the green strength of the compacts, which constitute the electrode. Green strength is also required in uranium dioxide (UO{sub 2}) powder compacts, to withstand stresses during de-tensioning after compaction as well as during ejection from the die and for subsequent handling by man and machine. The strengths of zirconium sponge and UO{sub 2} powder compacts have been determined by bending and crushing respectively, and Weibul moduli evaluated. The green density of coarse sponge compact was found to be larger than that from finer sponge. The green density of compacts from lightly attrited UO{sub 2} powder was higher than that from unattrited category, accompanied by an improvement in UO{sub 2} green crushing strength. The factors governing green strength have been examined in the light of published literature and experimental evidence. The methodology and results provide a basis for quality control in metal sponge and ceramic powder compaction in the manufacture of nuclear fuel.

Balakrishna, Palanki [Nuclear Fuel Complex, Hyderabad 500 062 (India)], E-mail: bpalanki@rediffmail.com; Murty, B. Narasimha; Sahoo, P.K.; Gopalakrishna, T. [Nuclear Fuel Complex, Hyderabad 500 062 (India)

2008-07-15

268

Hydrogen pickup measurements in zirconium alloys: Relation to oxidation kinetics  

NASA Astrophysics Data System (ADS)

The optimization of zirconium-based alloys used for nuclear fuel cladding aims to reduce hydrogen pickup during operation, and the associated cladding degradation. The present study focuses on precisely and accurately measuring hydrogen pickup fraction for a set of alloys to specifically investigate the effects of alloying elements, microstructure and corrosion kinetics on hydrogen uptake. To measure hydrogen concentrations in zirconium alloys two techniques have been used: a destructive technique, Vacuum Hot Extraction, and a non-destructive one, Cold Neutron Prompt Gamma Activation Analysis. The results of both techniques show that hydrogen pickup fraction varies significantly with exposure time and between alloys. A possible interpretation of the results is that hydrogen pickup results from the need to balance charge. That is, the pickup of hydrogen shows an inverse relationship to oxidation kinetics, indicating that, if transport of charged species is rate limiting, oxide transport properties such as oxide electronic conductivity play a key role in the hydrogen pickup mechanism. Alloying elements (either in solid solution or in precipitates) would therefore impact the hydrogen pickup fraction by affecting charge transport.

Couet, Adrien; Motta, Arthur T.; Comstock, Robert J.

2014-08-01

269

40 CFR 97.387 - Change in regulatory status.  

Code of Federal Regulations, 2011 CFR

...CAIR NOX AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.387 Change...status. (a) Notification. If a CAIR NOX Ozone Season opt-in unit becomes a CAIR NOX Ozone Season unit under 97.304, then...

2011-07-01

270

40 CFR 97.387 - Change in regulatory status.  

Code of Federal Regulations, 2010 CFR

...CAIR NOX AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.387 Change...status. (a) Notification. If a CAIR NOX Ozone Season opt-in unit becomes a CAIR NOX Ozone Season unit under 97.304, then...

2010-07-01

271

46 CFR 97.05-5 - Charts and nautical publications.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Charts and nautical publications. 97.05-5...and Aids to Navigation 97.05-5 Charts and nautical publications. As...adequate and up-to-date (a) Charts; (b) Sailing directions;...

2011-10-01

272

46 CFR 97.05-5 - Charts and nautical publications.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Charts and nautical publications. 97.05-5...and Aids to Navigation 97.05-5 Charts and nautical publications. As...adequate and up-to-date (a) Charts; (b) Sailing directions;...

2013-10-01

273

46 CFR 97.05-5 - Charts and nautical publications.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Charts and nautical publications. 97.05-5...and Aids to Navigation 97.05-5 Charts and nautical publications. As...adequate and up-to-date (a) Charts; (b) Sailing directions;...

2010-10-01

274

46 CFR 97.05-5 - Charts and nautical publications.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Charts and nautical publications. 97.05-5...and Aids to Navigation 97.05-5 Charts and nautical publications. As...adequate and up-to-date (a) Charts; (b) Sailing directions;...

2012-10-01

275

40 CFR 97.387 - Change in regulatory status.  

Code of Federal Regulations, 2013 CFR

...AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.387 Change in regulatory...a) Notification. If a CAIR NOX Ozone Season opt-in unit becomes a CAIR NOX Ozone Season unit under 97.304, then the CAIR...

2013-07-01

276

40 CFR 97.384 - Opt-in process.  

Code of Federal Regulations, 2013 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.384 Opt-in...is withdrawn from the CAIR NOX Ozone Season Trading Program in accordance with 97...which the unit enters the CAIR NOX Ozone Season Trading Program under ...

2013-07-01

277

40 CFR 97.387 - Change in regulatory status.  

...AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.387 Change in regulatory...a) Notification. If a CAIR NOX Ozone Season opt-in unit becomes a CAIR NOX Ozone Season unit under 97.304, then the CAIR...

2014-07-01

278

40 CFR 97.387 - Change in regulatory status.  

Code of Federal Regulations, 2012 CFR

...AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.387 Change in regulatory...a) Notification. If a CAIR NOX Ozone Season opt-in unit becomes a CAIR NOX Ozone Season unit under 97.304, then the CAIR...

2012-07-01

279

40 CFR 97.384 - Opt-in process.  

Code of Federal Regulations, 2012 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.384 Opt-in...is withdrawn from the CAIR NOX Ozone Season Trading Program in accordance with 97...which the unit enters the CAIR NOX Ozone Season Trading Program under ...

2012-07-01

280

40 CFR 97.384 - Opt-in process.  

Code of Federal Regulations, 2011 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.384 Opt-in...is withdrawn from the CAIR NOX Ozone Season Trading Program in accordance with 97...which the unit enters the CAIR NOX Ozone Season Trading Program under ...

2011-07-01

281

36 CFR 7.97 - Golden Gate National Recreation Area.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Golden Gate National Recreation Area. 7.97 Section...NATIONAL PARK SYSTEM 7.97 Golden Gate National Recreation Area. (a) Boat...Upon all designated routes in Golden Gate National Recreation Area. (ii)...

2010-07-01

282

36 CFR 7.97 - Golden Gate National Recreation Area.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 2011-07-01 false Golden Gate National Recreation Area. 7.97 Section...NATIONAL PARK SYSTEM 7.97 Golden Gate National Recreation Area. (a) Boat...Upon all designated routes in Golden Gate National Recreation Area. (ii)...

2011-07-01

283

36 CFR 7.97 - Golden Gate National Recreation Area.  

Code of Federal Regulations, 2013 CFR

...2013-07-01 2013-07-01 false Golden Gate National Recreation Area. 7.97 Section...NATIONAL PARK SYSTEM 7.97 Golden Gate National Recreation Area. (a) Boat...Upon all designated routes in Golden Gate National Recreation Area. (ii)...

2013-07-01

284

36 CFR 7.97 - Golden Gate National Recreation Area.  

Code of Federal Regulations, 2012 CFR

...2012-07-01 2012-07-01 false Golden Gate National Recreation Area. 7.97 Section...NATIONAL PARK SYSTEM 7.97 Golden Gate National Recreation Area. (a) Boat...Upon all designated routes in Golden Gate National Recreation Area. (ii)...

2012-07-01

285

46 CFR 97.37-11 - Carbon dioxide warning signs.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Carbon dioxide warning signs. 97.37-11 Section...Equipment, Etc. 97.37-11 Carbon dioxide warning signs. Each entrance to a space storing carbon dioxide cylinders, a space protected by...

2013-10-01

286

46 CFR 97.37-11 - Carbon dioxide warning signs.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Carbon dioxide warning signs. 97.37-11 Section...Equipment, Etc. 97.37-11 Carbon dioxide warning signs. Each entrance to a space storing carbon dioxide cylinders, a space protected by...

2012-10-01

287

Physicomechanical properties of the surface of a zirconium alloy modified by a pulsed ion beam  

NASA Astrophysics Data System (ADS)

The physicomechanical properties of the surface of the Zr-1% Nb zirconium alloy modified by a pulsed carbon ion beam with a pulse duration of 80 ns, an energy of 200 keV, and a current density of 120 A/cm2 are studied at four regimes having different numbers of pulses. Irradiation by a carbon ion beam results in hardening of the surface layer to a depth of 2 ?m, grain refinement to 0.15-0.8 ?m, zirconium carbide formation, and a decrease in the hydrogen permeability of the zirconium alloy.

Chernov, I. P.; Berezneeva, E. V.; Beloglazova, P. A.; Ivanova, S. V.; Kireeva, I. V.; Lider, A. M.; Remnev, G. E.; Pushilina, N. S.; Cherdantsev, Yu. P.

2014-04-01

288

Raj JainThe Ohio State University 97-0831: GFR --Providing97-0831: GFR --Providing  

E-print Network

(GFR) q GFR guarantees: q Low loss ratio to conforming frames q Best effort to all frames q Fair share1 Raj JainThe Ohio State University 97-0831: GFR -- Providing97-0831: GFR -- Providing Rate OverviewOverview #12;3 Raj JainThe Ohio State University Guaranteed Frame Rate (GFR)Guaranteed Frame Rate

Jain, Raj

289

Ruthenium-97 hepatobiliary agents for delayed studies of the bilary tract I: Ru-97 PIPIDA: concise communication  

SciTech Connect

Failure of early diagnosis of biliary atresia results in the development of cirrhosis and death. Commonly used hepatobiliary agents are not ideal for follow-up studies because of their unfavorable physical properties or short half-life. The excellent physical properties of Ru-97 should overcome these limitations. Therefore, Ru-97 PIPIDA (N,..cap alpha..-(p-isopropyl acetanilide) iminoacetic acid) is being investigated as a potential hepatobiliary agent that would allow an improved diagnosis of the disease. Ruthenium-97 PIPIDA and Tc-99m PIPIDA showed similar blood clearance rates in dogs. Ru-97 PIPIDA scintigrams in dogs showed early uptake in liver and gallbladder and slow excretion through the gastrointestinal tract. Biodistribution studies were performed in normal rats and rats with biliary obstruction. The findings suggest that Ru-97 PIPIDA should be useful for delayed studies ( 1 to 3 days) of the biliary tract.

Schachner, E.R.; Gil, M.C.; Atkins, H.L.; Som, P.; Srivastava, S.C.; Badia, J.; Sacker, D.F.; Fairchild, R.G.; Richards, P.

1981-04-01

290

Electrochemical formation of uranium-zirconium alloy in LiCl-KCl melts  

NASA Astrophysics Data System (ADS)

Since zirconium is considered an electrochemically active species under practical conditions of the electrorefining process, it is crucial to understand the electrochemical behavior of zirconium in LiCl-KCl melts containing actinide ions. In this study, the electrochemical codeposition of uranium and zirconium on a solid cathode was performed. It was found that the ?-(U, Zr) phase, which is the only intermediate phase of the uranium-zirconium binary alloy system, was deposited on a tantalum substrate by potentiostatic electrolysis at -1.60 V (vs. Ag +/Ag) in LiCl-KCl melts containing 0.13 in mol% UCl 3 and 0.23 in mol% ZrCl 4 at 773 K. To our knowledge, this is the first report on the electrochemical formation of the ?-(U, Zr) phase. The relative partial molar properties of uranium in the ?-(U, Zr) phase were evaluated by measuring the open-circuit-potentials of the electrochemically prepared ?-phase electrode.

Murakami, Tsuyoshi; Kato, Tetsuya; Kurata, Masaki; Yamana, Hajimu

2009-11-01

291

Development of a plasma coating system for induction melting zirconium in a graphite crucible  

SciTech Connect

A plasma coating system has been developed for induction melting zirconium at 1900 C using a graphite crucible. This laminated coating system consists of plasma spraying the following materials onto the graphite: (1) molybdenum or tungsten, (2) a 50% blend by weight of the metal powder and calcia-stabilized zirconium oxide, and (3) calcia-stabilized zirconia followed by painting a final coating of nonstabilized zirconia on top of the plasma-sprayed coating system. Zirconium was melted in argon using both laminating systems without any degradation of the graphite crucible and with only a minimal amount of carbon absorption. This novel approach that is being proposed as an alternative method of melting zirconium alloys offers substantial cost savings over the standard practice of electric arc melting using a consumable electrode.

Bird, E.L.; Holcombe, C.E. Jr.

1993-05-26

292

Quantum molecular dynamics simulation of hydrogen diffusion in zirconium hydride  

NASA Astrophysics Data System (ADS)

The behavior of hydrogen in zirconium hydride in the high-temperature range has been investigated using the quantum molecular dynamics method. The ? phases of compositions ZrH1.75 and ZrH2 and the liquid phase are considered. The self-diffusion coefficients of hydrogen are calculated as a function of the temperature in the range from 1000 to 6000 K. For the ZrH1.75 and ZrH2 hydrides, the obtained values are close to each other. At temperatures of 1000-2000 K, the hydrogen diffusion is determined not only by the mobility of hydrogen atoms but also by the transition from the energetically favorable tetrahedral positions into the excited state. The obtained values of the diffusion coefficients in the temperature range of 1000-1200 K are in good agreement with the experimental data.

Yanilkin, A. V.

2014-09-01

293

Titanium-Zirconium-Nickel Alloy Inside Marshall's Electrostatic Levitator (ESL)  

NASA Technical Reports Server (NTRS)

This Photo, which appeared on the July cover of `Physics Today', is of the Electrostatic Levitator (ESL) at NASA's Marshall Space Flight Center (MSFC). The ESL uses static electricity to suspend an object (about 3-4 mm in diameter) inside a vacuum chamber allowing scientists to record a wide range of physical properties without the sample contracting the container or any instruments, conditions that would alter the readings. Once inside the chamber, a laser heats the sample until it melts. The laser is then turned off and the sample cools, changing from a liquid drop to a solid sphere. In this particular shot, the ESL contains a solid metal sample of titanium-zirconium-nickel alloy. Since 1977, the ESL has been used at MSFC to study the characteristics of new metals, ceramics, and glass compounds. Materials created as a result of these tests include new optical materials, special metallic glasses, and spacecraft components.

2003-01-01

294

Titanium-Zirconium-Nickel Alloy Inside Marshall's Electrostatic Levitator (ESL)  

NASA Technical Reports Server (NTRS)

This is a close-up of a sample of titanium-zirconium-nickel alloy inside the Electrostatic Levitator (ESL) vacuum chamber at NASA's Marshall Space Flight Center (MSFC). The ESL uses static electricity to suspend an object (about 3-4 mm in diameter) inside a vacuum chamber allowing scientists to record a wide range of physical properties without the sample contracting the container or any instruments, conditions that would alter the readings. Once inside the chamber, a laser heats the sample until it melts. The laser is then turned off and the sample cools, changing from a liquid drop to a solid sphere. Since 1977, the ESL has been used at MSFC to study the characteristics of new metals, ceramics, and glass compounds. Materials created as a result of these tests include new optical materials, special metallic glasses, and spacecraft components.

2003-01-01

295

Evaluation of zirconium-iron-rhenium alloys as surrogates for a technetium alloy waste form  

E-print Network

EVALUATION OF ZIRCONIUM-IRON-RHENIUM ALLOYS AS SURROGATES FOR A TECHNETIUM ALLOY WASTE FORM A Thesis by PAUL AARON MEWS 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 2007 Major Subject: Nuclear Engineering EVALUATION OF ZIRCONIUM-IRON-RHENIUM ALLOYS AS SURROGATES FOR A TECHNETIUM ALLOY WASTE FORM A Thesis by PAUL AARON MEWS Submitted...

Mews, Paul Aaron

2008-10-10

296

A simple route for organic covalent grafting onto zirconium carbide particles  

NASA Astrophysics Data System (ADS)

Starting from core-shell zirconium carbide powders, a covalent grafting was described, using a direct nucleophilic substitution in diethyl ether. Thus, two different organic molecules were attached onto the surface of the ceramic, through Sisbnd Osbnd Zr and Csbnd Osbnd Zr bonds. The materials were characterized by means of TEM and XPS characterizations. These new systems could represent an original route to elaborate zirconium carbide-based hybrid materials.

Lucas, Romain; Pizon, David; Laborde, Etienne; Trolliard, Gilles; Foucaud, Sylvie; Matre, Alexandre

2013-12-01

297

Actinide partitioning studies using dihexyl-N,N-diethycarbamolymehtyl phosphonate and dissolved zirconium calcine  

SciTech Connect

A baseline flowsheet capable of partitioning the transuranic (TRU) elements from dissolved zirconium calcines has been developed. The goal of the TRU partitioning process is to remove the TRUs from solutions of dissolved zirconium calcines to below the 10 CFR 61.55 Class A waste limit of 10 nCi/g. Extraction, scrub, strip, and wash distribution coefficients for several elements, including the actinides, were measured in the laboratory by performing equal volume batch contacts. A solvent containing diheyl-N, N- diethylcarbamoylmethyl phosphonate (CMP), tributylphosphate (TBP), and a branched chain hydrocarbon as the diluent were used to develop this process. A non-radioactive zirconium pilot-plant calcine was spiked with the TRUs, U, Tc, or a radioactive isotope of zirconium to simulate the behavior of these elements in actual dissolved zirconium calcine feed. Distribution coefficient data obtained from laboratory testing were used to recommend: (1) solvent composition, (2) scrub solutions capable of selectively removing extracted zirconium while minimizing actinide recycle, (3) optimized strip solutions which quantitatively recover extracted actinides, and (4) feed adjustments necessary for flowsheet efficiency. Laboratory distribution coefficients were used in conjunction with the Generic TRUEX Model (GTM) to develop and recommend a flowsheet for testing in the 5.5-cm Centrifugal Contractor Mockup. GTM results indicate that the recommended flowsheet should remove the actinides from dissolved zirconium calcine feed to below the Class A waste limit of 10 nCi/g. Less than 0.01 wt% of the extracted zirconium will report to the high- activity waste (HAW) fraction using the 0.05 M H{sub 2}C{sub 2}O{sub 4} in 3.0 M HNO{sub 3} scrub, and greater than 99% of the extracted actinides are recovered with 0.001 M HEDPA.

Brewer, K.N.; Herbst, R.S.; Law, J.D.; Garn, T.G.; Tillotson, R.D.; Todd, T.A.

1996-01-01

298

Co-Rolled U10Mo/Zirconium-Barrier-Layer Monolithic Fuel Foil Fabrication Process  

SciTech Connect

Integral to the current UMo fuel foil processing scheme being developed at Idaho National Laboratory (INL) is the incorporation of a zirconium barrier layer for the purpose of controlling UMo-Al interdiffusion at the fuel-meat/cladding interface. A hot co-rolling process is employed to establish a ~25-m-thick zirconium barrier layer on each face of the ~0.3-mm-thick U10Mo fuel foil.

G. A. Moore; M. C. Marshall

2010-01-01

299

Esterification of Stearic Acid with Triethanolamine over Zirconium Sulfate Supported on SBA15 Mesoporous Molecular Sieve  

Microsoft Academic Search

Zirconium sulfate supported on SBA-15 (pore diameter about 6nm) mesoporous molecular sieve was synthesized. Various techniques,\\u000a such as nitrogen adsorptiondesorption isotherms, X-ray diffraction, transmission electron microscopy, and temperature-programmed\\u000a desorption, were used to characterize the prepared catalysts. It was shown that the catalyst exhibited straight, parallel,\\u000a and uniform channels, zirconium sulfate had been finely dispersed on the surface of SBA-15, and

Tao Geng; Qiuxiao Li; Yajie Jiang; Wei Wang

2011-01-01

300

Activated carbons modified with aluminiumzirconium polycations as adsorbents for ammonia  

Microsoft Academic Search

Microporous\\/mesoporous wood-based activated carbon was modified by impregnation with aluminiumzirconium oxycations and calcined at 300C, and then used as an adsorbent of ammonia. Water was present either on the carbon or in the gas phase. The initial (before ammonia adsorption) and exhausted materials were characterized using adsorption of nitrogen, potentiometric titration, XRD, FTIR and thermal analysis. Aluminiumzirconium polycations improve ammonia

Camille Petit; Teresa J. Bandosz

2008-01-01

301

STS-97 crew arrives at KSC for launch  

NASA Technical Reports Server (NTRS)

After arriving at the Shuttle Landing Facility, the STS-97 crew gather to address the media. At the microphone is Pilot Michael Bloomfield. Behind him can be seen Mission Specialists Joseph Tanner and Carlos Noriega. Mission STS-97 is the sixth construction flight to the International Space Station. Its payload includes the P6 Integrated Truss Structure and a photovoltaic (PV) module, with giant solar arrays that will provide power to the Station. The mission includes two spacewalks to complete the solar array connections. STS-97 is scheduled to launch Nov. 30 at about 10:06 p.m. EST.

2000-01-01

302

STS-97 crew arrives at KSC for launch  

NASA Technical Reports Server (NTRS)

After arriving at the Shuttle Landing Facility, the STS-97 crew gather to address the media. At the microphone is Mission Specialist Marc Garneau, who is with the Canadian Space Agency. Behind him can be seen Mission Specialists Joseph Tanner (left) and Carlos Noriega. Mission STS-97 is the sixth construction flight to the International Space Station. Its payload includes the P6 Integrated Truss Structure and a photovoltaic (PV) module, with giant solar arrays that will provide power to the Station. The mission includes two spacewalks to complete the solar array connections. STS-97 is scheduled to launch Nov. 30 at about 10:06 p.m. EST.

2000-01-01

303

Mechanical resistance of zirconium implant abutments: A review of the literature  

PubMed Central

The increase of aesthetic demands, together with the successful outcome of current implants, has renewed interest in the search for new materials with enough mechanical properties and better aesthetic qualities than the materials customarily used in implanto-prosthetic rehabilitation. Among these materials, zirconium has been used in different types of implants, including prosthetic abutments. The aim of the present review is to analyse current scientific evidence supporting the use of this material for the above mentioned purposes. We carried out the review of the literature published in the last ten years (2000 through 2010) of in vitro trials of dynamic and static loading of zirconium abutments found in the databases of Medline and Cochrane using the key words zirconium abutment, fracture resistance, fracture strength, cyclic loading. Although we have found a wide variability of values among the different studies, abutments show favourable clinical behaviour for the rehabilitation of single implants in the anterior area. Such variability may be explained by the difficulty to simulate daily mastication under in vitro conditions. The clinical evidence, as found in our study, does not recommend the use of implanto-prosthetic zirconium abutments in the molar area. Key words: Zirconium abutment, zirconium implant abutment, zirconia abutment, fracture resistance, fracture strength, cyclic loading. PMID:22143702

Vaquero-Aguilar, Cristina; Torres-Lagares, Daniel; Jimenez-Melendo, Manuel; Gutierrez-Perez, Jose L.

2012-01-01

304

Synthesis, characterization and optical properties of novel N donor ligands-chelated zirconium(IV) complexes  

NASA Astrophysics Data System (ADS)

Novel zirconium complexes have been synthesized by using a mixture of zirconium nitrate, 1,2,4,5-benzen tetracarboxylic acid (H4btec), 1,10-phenanthroline(phen) and potassium thiocyanate. Monodentate coordination mode of btec acid for all complexes was investigated by FT-IR spectroscopy. The complexes were also characterized by UV-Vis, 1H NMR, CHN, ICP-AES. The reaction details and features were described and discussed. The photoluminescence emission of seven zirconium complexes was shown two series peaks: first, sharp and intense bands from 300 to 500 nm and broadened with less intensity from 650 to 750 nm for the second bands. Each of the zirconium compounds were doped in PVK:PBD blend as host. The ratio of zirconium complexes for each type were modified 8 wt.% in PVK:PBD(100:40). The electroluminescence spectra of zirconium complexes were indicated a red shift rather than PVK:PBD blend. We suggest that the electroplex occurring at PVK-Zr complex interface.

Shahroosvand, Hashem; Nasouti, Fahimeh; Mohajerani, Ezeddin; Khabbazi, Amir

2012-11-01

305

Nucleophilic attack on eta/sup 2/-acyls of zirconium. The synthesis and reactivity of zirconium ketone complexes  

SciTech Connect

The reaction of Cp/sub 2/ZrMe/sub 2/ with the eta/sup 2/-acyl complex, Cp/sub 2/Zr(C(O)Me)(/sup +/-OC)Mo(CO)/sub 2/Cp, produced the bridging ketone complex 4. The nucleophilic Ar-CH/sub 3/ added 1,2 across the C-O bond of the acyl group to generate an acetone ligand which was coordinated through the ketone oxygen to one Zr center and through both the ketone carbon and oxygen to the other Zr center. The crystal structure of 4 was reported. Ancillary ligand effects were investigated on the susceptibility of zirconocene eta/sup 2/-acyls to attack by Cp/sub 2/ZrMe/sub 2/, and on the ability of zirconocene methyl complexes to act as nucleophiles. Nucleophilic attack by Cp/sub 2/ZrMe/sub 2/ at the carbon of a eta/sup 2/-acyl was favored by the presence of a strong sigma-donor with limited ..pi..-donor ability. Methyl transfer from a zirconocene methyl complex was favored by the presence of similar ancillary substitution. Reactions of standard organometallic nucleophiles with zirconium eta/sup 2/-acyls was investigated as a route to new ketone complexes. The presence of ..cap alpha..-protons on the acyl group resulted in its deprotonation to known ketene complexes. The absence of ..cap alpha..-protons on the acyl group permitted the use of RLi reagents to synthesize new zirconium ketone complexes. The reactivity of complex 4 towards insertion, radical addition and attack by nucleophilic and electrophilic reagents was investigated. The crystal structure of the product of CO insertion into the ketone ligand was reported.

Matchett, S.A.

1986-01-01

306

40 CFR 763.97 - Compliance and enforcement.  

...AGENCY (CONTINUED) TOXIC SUBSTANCES CONTROL ACT ASBESTOS Asbestos-Containing Materials in Schools 763.97 ...complaint to the Governor of the State or the EPA Asbestos Ombudsman, 1200 Pennsylvania Ave., NW.,...

2014-07-01

307

40 CFR 98.97 - Records that must be retained.  

Code of Federal Regulations, 2013 CFR

...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Electronics Manufacturing 98.97 Records that must be retained. In addition to the information required by ...

2013-07-01

308

40 CFR 98.97 - Records that must be retained.  

...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Electronics Manufacturing 98.97 Records that must be retained. In addition to the information required by ...

2014-07-01

309

40 CFR 98.97 - Records that must be retained.  

Code of Federal Regulations, 2011 CFR

...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Electronics Manufacturing 98.97 Records that must be retained. In addition to the information required by ...

2011-07-01

310

40 CFR 98.97 - Records that must be retained.  

Code of Federal Regulations, 2012 CFR

...Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) MANDATORY GREENHOUSE GAS REPORTING Electronics Manufacturing 98.97 Records that must be retained. In addition to the information required by ...

2012-07-01

311

40 CFR 97.313 - Certificate of representation.  

Code of Federal Regulations, 2011 CFR

... CAIR Designated Representative for CAIR NOX Ozone Season Sources 97.313 Certificate of...Administrator: (1) Identification of the CAIR NOX Ozone Season source, and each CAIR NOX Ozone Season unit at the source, for which the...

2011-07-01

312

40 CFR 97.351 - Establishment of accounts.  

Code of Federal Regulations, 2010 CFR

...NOX AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97...a compliance account for the CAIR NOX Ozone Season source for which the certificate...purpose of holding and transferring CAIR NOX Ozone Season allowances. An...

2010-07-01

313

40 CFR 97.313 - Certificate of representation.  

Code of Federal Regulations, 2010 CFR

... CAIR Designated Representative for CAIR NOX Ozone Season Sources 97.313 Certificate of...Administrator: (1) Identification of the CAIR NOX Ozone Season source, and each CAIR NOX Ozone Season unit at the source, for which the...

2010-07-01

314

40 CFR 97.351 - Establishment of accounts.  

Code of Federal Regulations, 2011 CFR

...NOX AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97...a compliance account for the CAIR NOX Ozone Season source for which the certificate...purpose of holding and transferring CAIR NOX Ozone Season allowances. An...

2011-07-01

315

14 CFR 151.97 - Maintenance and repair.  

Code of Federal Regulations, 2010 CFR

...FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION (CONTINUED) AIRPORTS FEDERAL AID TO AIRPORTS Project Programming Standards 151.97 Maintenance and repair. (a) Maintenance work is not airport development as...

2010-01-01

316

46 CFR 97.47-1 - All persons must comply.  

Code of Federal Regulations, 2010 CFR

...CONTINUED) CARGO AND MISCELLANEOUS VESSELS OPERATIONS Routing Instructions 97.47-1 All persons must comply. ...certificated seamen on U.S. vessels must strictly comply with routing instructions issued by competent naval authority....

2010-10-01

317

97. VIEW OF MILL SOLUTION PUMP No. 2 FROM SOUTHEAST. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

97. VIEW OF MILL SOLUTION PUMP No. 2 FROM SOUTHEAST. SUMPS ARE UNDER FLOOR, BEYOND. STAIR LEADS TO AGITATOR/GOLD TANK ACCESS PLATFORM. - Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD

318

46 CFR 97.20-1 - Unnecessary whistling prohibited.  

Code of Federal Regulations, 2010 CFR

...AND MISCELLANEOUS VESSELS OPERATIONS Whistling 97.20-1 Unnecessary whistling prohibited. (a) The unnecessary sounding of the vessel's whistle is prohibited within any harbor limits of the United...

2010-10-01

319

97. VIEW OF THE WATER WORKS FROM THE EAST, 1829 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

97. VIEW OF THE WATER WORKS FROM THE EAST, 1829 George Lehman, Lithographer; Published by C. G. Childs Collection of the Free Library of Philadelphia - Fairmount Waterworks, East bank of Schuylkill River, Aquarium Drive, Philadelphia, Philadelphia County, PA

320

47 CFR 97.401 - Operation during a disaster.  

Code of Federal Regulations, 2011 CFR

...RADIO SERVICE Providing Emergency Communications 97.401 Operation...frequency 5.1689 MHz) for emergency communications. The channel must...operation, and maintenance of emergency communication systems. [71 FR...

2011-10-01

321

47 CFR 97.401 - Operation during a disaster.  

Code of Federal Regulations, 2010 CFR

...RADIO SERVICE Providing Emergency Communications 97.401 Operation...frequency 5.1689 MHz) for emergency communications. The channel must...operation, and maintenance of emergency communication systems. [71 FR...

2010-10-01

322

47 CFR 97.407 - Radio amateur civil emergency service.  

Code of Federal Regulations, 2013 CFR

...SERVICE Providing Emergency Communications 97.407 Radio amateur civil emergency service...the President's War Emergency Powers under the provisions...section 706 of the Communications Act of 1934,...

2013-10-01

323

47 CFR 97.407 - Radio amateur civil emergency service.  

Code of Federal Regulations, 2012 CFR

...SERVICE Providing Emergency Communications 97.407 Radio amateur civil emergency service...the President's War Emergency Powers under the provisions...section 706 of the Communications Act of 1934,...

2012-10-01

324

47 CFR 97.401 - Operation during a disaster.  

Code of Federal Regulations, 2012 CFR

...RADIO SERVICE Providing Emergency Communications 97.401 Operation...frequency 5.1689 MHz) for emergency communications. The channel must...operation, and maintenance of emergency communication systems. [71 FR...

2012-10-01

325

47 CFR 97.401 - Operation during a disaster.  

Code of Federal Regulations, 2013 CFR

...RADIO SERVICE Providing Emergency Communications 97.401 Operation...frequency 5.1689 MHz) for emergency communications. The channel must...operation, and maintenance of emergency communication systems. [71 FR...

2013-10-01

326

Enhanced surveillance program FY97 accomplishments. Progress report  

SciTech Connect

This annual report is one volume of the Enhanced Surveillance Program (ESP) FY97 Accomplishments. The complete accomplishments report consists of 11 volumes. Volume 1 includes an ESP overview and a summary of selected unclassified FY97 program highlights. Volume 1 specifically targets a general audience, reflecting about half of the tasks conducted in FY97 and emphasizing key program accomplishments and contributions. The remaining volumes of the accomplishments report are classified, organized by program focus area, and present in technical detail the progress achieved in each of the 104 FY97 program tasks. Focus areas are as follows: pits; high explosives; organics; dynamics; diagnostics; systems; secondaries; nonnuclear materials; nonnuclear components; and Surveillance Test Program upgrades.

Mauzy, A. [ed.; Laake, B. [comp.

1997-10-01

327

46 CFR 111.97-3 - General requirements.  

Code of Federal Regulations, 2010 CFR

...GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) ELECTRICAL ENGINEERING ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Electric Power-Operated Watertight Door Systems 111.97-3 General requirements. Each watertight door...

2010-10-01

328

34 CFR 97.116 - General requirements for informed consent.  

Code of Federal Regulations, 2013 CFR

...Policy for the Protection of Human Subjects (Basic ED Policy for Protection of Human Research Subjects) 97...investigator may involve a human being as a subject...subject (or to the embryo or fetus, if the subject is or...

2013-07-01

329

40 CFR 97.516 - Certificate of representation.  

Code of Federal Regulations, 2013 CFR

...CAIR NOX AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.516 Certificate of... (1) Identification of the TR NOX Ozone Season source, and each TR NOX Ozone Season unit at the source, for which...

2013-07-01

330

40 CFR 97.351 - Establishment of accounts.  

Code of Federal Regulations, 2012 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.351...compliance account for the CAIR NOX Ozone Season source for which the certificate of...holding and transferring CAIR NOX Ozone Season allowances. An application...

2012-07-01

331

40 CFR 97.313 - Certificate of representation.  

Code of Federal Regulations, 2012 CFR

...Designated Representative for CAIR NOX Ozone Season Sources 97.313 Certificate of representation...1) Identification of the CAIR NOX Ozone Season source, and each CAIR NOX Ozone Season unit at the source, for which the...

2012-07-01

332

40 CFR 97.516 - Certificate of representation.  

Code of Federal Regulations, 2012 CFR

...CAIR NOX AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.516 Certificate of... (1) Identification of the TR NOX Ozone Season source, and each TR NOX Ozone Season unit at the source, for which...

2012-07-01

333

40 CFR 97.351 - Establishment of accounts.  

Code of Federal Regulations, 2013 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.351...compliance account for the CAIR NOX Ozone Season source for which the certificate of...holding and transferring CAIR NOX Ozone Season allowances. An application...

2013-07-01

334

40 CFR 97.313 - Certificate of representation.  

Code of Federal Regulations, 2013 CFR

...Designated Representative for CAIR NOX Ozone Season Sources 97.313 Certificate of representation...1) Identification of the CAIR NOX Ozone Season source, and each CAIR NOX Ozone Season unit at the source, for which the...

2013-07-01

335

40 CFR 97.351 - Establishment of accounts.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.351...compliance account for the CAIR NOX Ozone Season source for which the certificate of...holding and transferring CAIR NOX Ozone Season allowances. An application...

2014-07-01

336

40 CFR 97.313 - Certificate of representation.  

...Designated Representative for CAIR NOX Ozone Season Sources 97.313 Certificate of representation...1) Identification of the CAIR NOX Ozone Season source, and each CAIR NOX Ozone Season unit at the source, for which the...

2014-07-01

337

40 CFR 97.516 - Certificate of representation.  

...CAIR NOX AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.516 Certificate of... (1) Identification of the TR NOX Ozone Season source, and each TR NOX Ozone Season unit at the source, for which...

2014-07-01

338

46 CFR 56.97-40 - Installation tests.  

Code of Federal Regulations, 2010 CFR

...MARINE ENGINEERING PIPING SYSTEMS AND APPURTENANCES Pressure Tests 56.97-40 Installation tests. (a...leak tested in the presence of a marine inspector at a pressure of 11/2 times the maximum allowable working...

2010-10-01

339

40 CFR 761.97 - Export for disposal.  

Code of Federal Regulations, 2010 CFR

...TOXIC SUBSTANCES CONTROL ACT POLYCHLORINATED BIPHENYLS (PCBs) MANUFACTURING, PROCESSING... Transboundary Shipments of PCBs for Disposal 761.97 Export...provisions. No person may export PCBs or PCB Items for disposal...

2010-07-01

340

97. DETAIL OF FOURTH CATWALK LEVEL SHOWING WEST SIDE, LOOKING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

97. DETAIL OF FOURTH CATWALK LEVEL SHOWING WEST SIDE, LOOKING NORTH, INNER DOME ON RIGHT WITH KNEE BRACE FROM INNER COLUMN TO CROSS BEAM - Maryland State House, State Circle, Annapolis, Anne Arundel County, MD

341

46 CFR 97.37-7 - General alarm bells.  

Code of Federal Regulations, 2010 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-7 General alarm...lettering at least 1/2 inch high: GENERAL ALARMWHEN BELL RINGS GO TO YOUR STATION. (b)...

2010-10-01

342

46 CFR 97.37-7 - General alarm bells.  

Code of Federal Regulations, 2013 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-7 General alarm...lettering at least 1/2 inch high: GENERAL ALARMWHEN BELL RINGS GO TO YOUR STATION. (b)...

2013-10-01

343

46 CFR 97.37-7 - General alarm bells.  

Code of Federal Regulations, 2011 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-7 General alarm...lettering at least 1/2 inch high: GENERAL ALARMWHEN BELL RINGS GO TO YOUR STATION. (b)...

2011-10-01

344

46 CFR 97.37-7 - General alarm bells.  

Code of Federal Regulations, 2012 CFR

... CARGO AND MISCELLANEOUS VESSELS OPERATIONS Markings for Fire and Emergency Equipment, Etc. 97.37-7 General alarm...lettering at least 1/2 inch high: GENERAL ALARMWHEN BELL RINGS GO TO YOUR STATION. (b)...

2012-10-01

345

28 CFR 2.97 - Withdrawal of order of release.  

...97 Withdrawal of order of release. If, after an order for release from active supervision...bring discredit to the parole system, the Commission may, in its...b) Withdraw the order of release from supervision and...

2014-07-01

346

24 CFR 81.97 - Waiver of regulations.  

...REGULATION OF THE FEDERAL NATIONAL MORTGAGE ASSOCIATION (FANNIE MAE) AND THE FEDERAL HOME LOAN MORTGAGE CORPORATION (FREDDIE MAC) Book-Entry Procedures 81.97 Waiver of regulations. The Secretary reserves the right in the Secretary's...

2014-04-01

347

24 CFR 81.97 - Waiver of regulations.  

Code of Federal Regulations, 2010 CFR

...REGULATION OF THE FEDERAL NATIONAL MORTGAGE ASSOCIATION (FANNIE MAE) AND THE FEDERAL HOME LOAN MORTGAGE CORPORATION (FREDDIE MAC) Book-Entry Procedures 81.97 Waiver of regulations. The Secretary reserves the right in the Secretary's...

2010-04-01

348

47 CFR 97.305 - Authorized emission types.  

Code of Federal Regulations, 2010 CFR

...97.305 Authorized emission types. (a) Except as specified elsewhere in this part, an amateur station may transmit a CW emission on any frequency authorized to the control operator. (b) A station may transmit a test emission on any...

2010-10-01

349

47 CFR 97.305 - Authorized emission types.  

Code of Federal Regulations, 2012 CFR

...97.305 Authorized emission types. (a) Except as specified elsewhere in this part, an amateur station may transmit a CW emission on any frequency authorized to the control operator. (b) A station may transmit a test emission on any...

2012-10-01

350

47 CFR 97.305 - Authorized emission types.  

Code of Federal Regulations, 2013 CFR

...97.305 Authorized emission types. (a) Except as specified elsewhere in this part, an amateur station may transmit a CW emission on any frequency authorized to the control operator. (b) A station may transmit a test emission on any...

2013-10-01

351

MISSION CONTROL CENTER STATUS REPORT #1 STS-97  

NSDL National Science Digital Library

On Sunday November 30, STS-97 Mission Specialists Carlos Noriega and Joe Tanner began the eleventh space walk in the history of the International Space Station. A daily status report on this mission is available from NASA's Johnson Space Center.

2000-01-01

352

The CMUnited97 Simulator Team Peter Stone and Manuela Veloso  

E-print Network

. The Soccer Server system provides a rich and challenging multiagent, real­time domain. Agents must accurately://www.cs.cmu.edu/f~pstone,~mmvg In RoboCup­97: Robot Soccer World Cup I, H. Kitano (ed.), 1998. Springer Verlag, Berlin. Abstract­ finals of the 29­team RoboCup­97 tournament. 1 Introduction The Soccer Server system [5] used at Robo

Stone, Peter

353

STS-97 and Expedition One Crews Pose for Onboard Photo  

NASA Technical Reports Server (NTRS)

In this image, the five STS-97 crew members pose with the 3 members of the Expedition One crew onboard the International Space Station (ISS) for the first ever traditional onboard portrait taken in the Zvezda Service Module. On the front row, left to right, are astronauts Brent W. Jett, Jr., STS-97 commander; William M. Shepherd, Expedition One mission commander; and Joseph R. Tarner, STS-97 mission specialist. On the second row, from the left are Cosmonaut Sergei K. Krikalev, Expedition One flight engineer; astronaut Carlos I. Noriega, STS-97 mission specialist; cosmonaut Yuri P. Gidzenko, Expedition One Soyuz commander; and Michael J. Bloomfield, STS-97 pilot. Behind them is astronaut Marc Garneau, STS-97 mission specialist representing the Canadian Space Agency (CSA). The primary objective of the STS-97 mission was the delivery, assembly, and activation of the U.S. electrical power system onboard the International Space Station (ISS). The electrical power system, which is built into a 73-meter (240-foot) long solar array structure consists of solar arrays, radiators, batteries, and electronics. The entire 15.4-metric ton (17-ton) package is called the P6 Integrated Truss Segment, and is the heaviest and largest element yet delivered to the station aboard a space shuttle. The electrical system will eventually provide the power necessary for the first ISS crews to live and work in the U.S. segment. The STS-97 crew of five launched aboard the Space Shuttle Orbiter Endeavor on November 30, 2000 for an 11 day mission.

2000-01-01

354

Bioenergy '97: Nordic Bioenergy Conference, market, environment and technology. (Bioenergi '97: nordisk bioenergikonferanse, marked, miljoe og teknikk).  

National Technical Information Service (NTIS)

The conference 'Bioenergy '97: Nordic Bioenergy Conference, market, environment and technology' took place in Oslo, Norway, 7-8 Oct 1997. The conference papers are grouped under three headings: (1) The nordic energy market. 12 papers. (2) Production and s...

1997-01-01

355

Actinide partitioning from actual ICPP dissolved zirconium calcine using the TRUEX solvent  

SciTech Connect

The TRansUranic EXtraction process (TRUEX), as developed by E.P. Horwitz and coworkers at Argonne National Laboratory (ANL), is being evaluated as a TRU extraction process for Idaho Chemical Processing Plant (ICPP) wastes. A criteria that must be met during this evaluation, is that the aqueous raffinate must be below the 10 nCi/g limit specified in 10 CFR 61.55. A test was performed where the TRUEX solvent (0.2 M octyl(phenyl)-N-N-diisobutyl-carbamoylmethyl-phosphine oxide (CMPO), and 1.4 M tributylphosphate (TBP) in an Isopar-L diluent) was contacted with actual ICPP dissolved zirconium calcine. Two experimental flowsheets were used to determine TRU decontamination factors, and TRU, Zr, Fe, Cr, and Tc extraction, scrub, and strip distribution coefficients. Results from these two flowsheets show that >99.99% of the TRU alpha activity was removed from the acidic feed after three contacts with the TRUEX solvent (fresh solvent being used for each contact). The resulting aqueous raffinate solution contained an approximate TRU alpha activity of 0.02 nCi/g, which is well below the non-TRU waste limit of 10 nCi/g specified in 10 CFR 61.55. Favorable scrub and strip distribution coefficients were also observed for Am-241, Pu-238, and Pu-239, indicating the feasibility of recovering these isotopes from the TRUTEX solvent. A solution of 0.04 M 1-hydroxyethane-1,1-diphosphonic acid (HEDPA) in 0.04 M HNO{sub 3} was used to successfully strip the TRUs from the TRUEX solvent. The results of the test using actual ICPP dissolved zirconium calcine, and subsequent GTM evaluation, show the feasibility of removing TRUs from the dissolved zirconium calcine with the TRUEX solvent and the deleterious effects zirconium poses with the ICPP zirconium calcine waste. Test results using actual ICPP zirconium calcine reveal the necessity of preventing zirconium from following the TRUs.

Brewer, K.N.; Herbst, R.S.; Tranter, T.J. [and others

1995-05-01

356

Synthesis and liquid crystal phase transitions of zirconium phosphate disks  

NASA Astrophysics Data System (ADS)

Solvent-mediated self-assembly of nanoparticles is an effective and efficient way for the bottom-up organization of functional structures. The primary object of this work is to build up a model system for the study of suspensions of disk-shaped nanoparticles, and use it for the study of self-assembly and discotic liquid crystal phase transitions of discotic particles. The work was introduced by the control over the size and polydispersity of zirconium phosphate (ZrP) disks through synthesis. Systematic experiments revealed that regular-shaped alpha-zirconium phosphate crystalline disks with a size-to-thickness ratio from 1 to 50 and size polydispersity as low as 0.2 can be obtained through hydrothermal treatment in 3 M to 15 M phosphoric acid solutions. Transmission and scanning electron micrographs revealed that the growth of the disks is mediated by oriented attachment, which happened continuously throughout the hydrothermal treatment between various sized disks. Ostwald ripening is effective in improving the regularity of the shape of the disks, especially under prolonged hydrothermal treatment. Under the microwave assisted hydrothermal conditions, the rate of attachment on the flat surfaces of the disks is accelerated, which leads to the formation of the column-shaped crystals. With the ability to adjust the size, aspect ratio, and polydispersity of ZrP disks, the study on self-assembly behavior and the discotic liquid crystal phases was enabled. Firstly, liquid crystal phases of aqueous suspensions of ZrP disks were investigated. Iridescent smectic phase and the critical points of phase transitions were found. Moreover, monolayer ZrP nanosheets with extremely high aspect ratio, which were achieved by exfoliating the ZrP crystals, were also used in this study. The high aspect ratio of nanosheets produces a laminar phase at low nanosheet concentration. Chiral liquid crystal phases were demonstrated when increased the concentration of the nanosheets. The competition between the chirality and layering leads to twisted and layered structures. For the final part, solvent-mediated self-assembly of disks and nanosheets via undulation of liquid crystal phases showed an interesting approach for bottom-up design of functional nano-structures.

Shuai, Min

357

75 FR 5850 - Proposed Collection; Comment Request for Notice 2006-97  

Federal Register 2010, 2011, 2012, 2013

...concerning Notice 2006-97, Taxation and Reporting of REIT Excess Inclusion Income. 2006-97, Taxation and Reporting of REIT Excess...Title: Notice 2006-97 Taxation and Reporting of REIT Excess...5851

2010-02-04

358

40 CFR 97.14 - Objections concerning NOX authorized account representative.  

... 97.14 Section 97.14 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED...provided in 97.12 (a) or (b), no objection or other communication submitted to the permitting authority or the...

2014-07-01

359

Strain effects on oxygen transport in tetragonal zirconium dioxide.  

PubMed

Temperature accelerated dynamics and molecular dynamics simulations are used to investigate the strain effects on oxygen interstitial and vacancy migration in tetragonal zirconium dioxide. At zero external strain, the anisotropic migration mechanisms of oxygen defects are characterized. At non-zero strains, both the crystal structure and defect migration barriers are modified by strain. Under compressive strains, the defect migration barrier increases with the increasing strain for both interstitials and vacancies. The crystal structure transforms from a tetragonal to a nearly cubic fluorite structure. Accordingly, the defect migration becomes nearly isotropic. Under dilative strains, the migration barrier first decreases then increases with increasing strain for both types of defects. The tetragonal phase transforms to a lower symmetry structure that is close to the orthorhombic phase. In turn, the defect migration becomes highly anisotropic. Under both compressive and dilative strains, interstitials respond to strain more strongly than vacancies. At small dilative strains, an oxygen interstitial has comparable diffusivity to a vacancy, suggesting that both types of defects can contribute to oxygen transport, if they are present. Although currently no previous result is available to validate oxygen interstitial diffusion behavior, the trend of strain effects on oxygen vacancy diffusion is in good agreement with available experimental and theoretical studies in the literature. PMID:24127018

Bai, Xian-Ming; Zhang, Yongfeng; Tonks, Michael R

2013-11-28

360

Zirconium umbelliferonephosphate - A luminescent organic-inorganic hybrid nanomaterial  

NASA Astrophysics Data System (ADS)

Zirconium umbelliferonephosphate (ZrO(UFP)) is prepared by nucleation in the ionic liquid [MeBu 3N][NTf 2]. According to electron microscopy the resulting nanoparticles exhibit mean particle diameters of about 50 nm. The organic-inorganic hybrid material ZrO(UFP) shows blue emission upon UV-excitation. Luminescence originates from the organic dye and is highly intense due to the molar amount of luminescent centers per nanoparticle. The as-prepared material turns out to be non-crystalline. Therefore, its chemical composition is validated by infrared spectroscopy, thermogravimetry, energy-dispersive X-ray analysis and elemental analysis. The results (i.e., thermal decomposition, Zr:P ratio, C-/H-concentration) are in accordance to the composition of ZrO(UFP). Upon addition of acid phosphatase the luminescence intensity of ZrO(UFP) is significantly increased due to enzymatic hydrolysis accompanied by a release of non-bound umbelliferone. Both aspects - the increase in luminescence intensity as well as the release of umbelliferone - might be of future interest regarding biomedical application of ZrO(UFP) nanoparticles.

Roming, Marcus; Feldmann, Claus

2011-03-01

361

Microstructure and mechanical properties of proton irradiated zirconium carbide  

NASA Astrophysics Data System (ADS)

Zirconium carbide is a candidate ceramic being considered for metal-carbide-base composite-type fuels, as well as for an alternative coating material for TRISO particle fuels. Ensuring adequate mechanical properties and dimensional stability in response to radiation is a key part in developing a practical ZrC-base fuel. The existing available radiation response data for ZrC is limited and insufficient. In the present study, ZrC was irradiated with a 2.6 MeV proton beam at 800 C to doses of 0.7 and 1.5 dpa. Following radiation, the radiation induced damage microstructure is comprised of a high density of nanometer-sized Frank loops, but no irradiation induced amorphization, voids, or precipitates were observed. A slight lattice expansion was found in the irradiated ZrC, in good agreement with the reported results from neutron irradiation. The changes in microhardness and fracture toughness properties induced in the irradiated samples were measured using indentation techniques. The hardness and the fracture toughness both increase with increasing radiation dose.

Yang, Yong; Dickerson, Clayton A.; Swoboda, Hannah; Miller, Brandon; Allen, Todd R.

2008-09-01

362

Biologically functionalized nanochannels on ferroelectric lead zirconium titanate surfaces.  

SciTech Connect

We recently started a program at Argonne to exploit patterned, polarizable ferroelectric surfaces, such as lead zirconium titanate (PZT), as a means to create field-responsive inorganic-biomolecule interfaces to study and manipulate biomatter on surfaces. In this paper we will discuss the integration of nanochannels on the surface of PZT films and their selective functionalization to create nanovalves to control nanofluidic flow. Microfluidic devices have been fabricated using a variety of methods, ranging from thermal decomposition of buried patterned channels, to fabricating trenches via plasma etch or hot embossing followed by trench capping. Our work focuses on an alternative method by using a bilayer resist in an inverted configuration normally used for T- and Gamma- gate fabrication. This method is capable of yielding sub-100 nm nanochannels with high aspect ratios and sub-500nm alignment. We have recently demonstrated that the polarization hysteresis loop of PZT is the same before and after exposure to an aqueous environment. This opens the possibility of selective surface modification of PZT via coupling of a wide range of biomolecules (e.g., peptides, proteins) and the use of the electric-field-responsive properties of PZT to manipulate the function (e.g., orientation) of the tethered biomolecules. We have used phage display techniques to evolve specific peptide motifs that selectively bind to PZT. The optimum heptapeptide that facilitates both the attachment of functional biological molecules to the surface of PZT has been identified.

Ocola, L. E.; Pan, W. C.; Kuo, M.; Tirumala, V. R.; Reiss, B. D.; Firestone, M. A.; Illinois Mathematics and Science Academy

2005-01-01

363

The thermophysical properties of calcium and barium zirconium phosphate  

NASA Astrophysics Data System (ADS)

The thermophysical and structural properties of calcium and barium zirconium phosphate ceramics (CZP and BZP) have been investigated for their potential candidacy as actinide hosts for inert matrix fuels (IMF) in nuclear reactors. These phosphate ceramics, which can accommodate minor actinides as well as the resulting fission products, are found to be thermally stable to 1600 C in air, however they begin to decompose in an inert atmosphere above approximately 1400 C. The heat capacity, thermal conductivity and bulk thermal-expansion were measured from room temperature up to 1200 C. Structural changes in this temperature region as well as the anisotropic thermal-expansion behaviour were studied using high-temperature X-ray diffraction. A phase change from R-3 to R-3c was identified for Ba0.5Zr2(PO4)3 near 880 C. The thermal conductivity for these ceramics at 1000 C was found to be 1.0 W m-1 K-1, a relatively low thermal conductivity that was increased to 5.0 W m-1 K-1 at 1000 C for BZP:Ni (25:75 mass ratio) cermet composites.

Gregg, Daniel J.; Karatchevtseva, Inna; Triani, Gerry; Lumpkin, Gregory R.; Vance, Eric R.

2013-10-01

364

Synthesis and Characterization of Zirconium Tungstate Ultra-Thin Fibers  

SciTech Connect

This study reports an innovative method of electrospinning followed by pyrolysis to synthesize zirconium tungstate (ZrW2O8), a material with negative coefficient of thermal expansion (CTE), in ultra-thin fiber form. Morphologies and microstructures of the as-electrospun precursor fibers, the heat-treated intermediate fibers, and the final ZrW2O8 ultra-thin fibers were characterized by SEM, XRD, and TEM. The ZrW2O8 ultra-thin fibers had diameters in the sub-micrometer range with aspect ratios larger than 100; these fibers were polycrystalline, and consisted of single crystalline ZrW2O8 crystallites with sizes of 30-50 nm and surface roughness of several nanometers. The ZrW2O8 ultra-thin fibers are expected to outperform spherically, cylindrically, and/or irregularly shaped polycrystalline ZrW2O8 particles for the development of composites with precisely controlled CTEs. Additionally, this reported method could be utilized as a general approach to convert nano-scaled inorganic particles into fibers.

Zhang, Lifeng [South Dakota School of Mines and Technology; Howe, Jane Y [ORNL; Fong, Hao [South Dakota School of Mines and Technology; Zhang, Yan [Anhui Normal University, People's Republic of China

2009-01-01

365

Characterization of zirconium thin films deposited by pulsed laser deposition  

NASA Astrophysics Data System (ADS)

Zirconium (Zr) thin films deposited on Si (100) by pulsed laser deposition (PLD) at different pulse repetition rates are investigated. The deposited Zr films exhibit a polycrystalline structure, and the X-ray diffraction (XRD) patterns of the films show the ? Zr phase. Due to the morphology variation of the target and the laserplasma interaction, the deposition rate significantly decreases from 0.0431 /pulse at 2 Hz to 0.0189 /pulse at 20 Hz. The presence of droplets on the surface of the deposited film, which is one of the main disadvantages of the PLD, is observed at various pulse repetition rates. Statistical results show that the dimension and the density of the droplets increase with an increasing pulse repetition rate. We find that the source of droplets is the liquid layer formed under the target surface. The dense nanoparticles covered on the film surface are observed through atomic force microscopy (AFM). The root mean square (RMS) roughness caused by valleys and islands on the film surface initially increases and then decreases with the increasing pulse repetition rate. The results of our investigation will be useful to optimize the synthesis conditions of the Zr films.

Liu, Wei; Wan, Jing-Ping; Cai, Wu-Peng; Liang, Jian-Hua; Zhou, Xiao-Song; Long, Xing-Gui

2014-09-01

366

Electrospun poly (vinyl alcohol)/ alpha-zirconium phosphate nanocomposite fibers  

NASA Astrophysics Data System (ADS)

Poly (vinyl alcohol) (PVA)/alpha-zirconium phosphate (ZrP) polymer nanocomposite (PNC) fibers were successfully prepared via the simple and low-cost electrospinning process. ZrP nanoparticles with two different dimensions, i.e., ZrP-500 with a lateral dimension of ca. 320 nm and an aspect ratio of ca. 500, and ZrP-1500 with a lateral dimension of ca. 950 nm and an aspect ratio of ca. 1500, were utilized to illustrate the size effect on the electrospun nanofibers. In order to obtain defect-free, uniform polymer nanocomposite fibers, a number of parameters including polymer concentration, feed rate, applied voltage and working distance between the needle tip and the fiber collecting substrate were investigated. Scanning electron microscopy (SEM) morphological analysis showed smooth and nonwoven electrospun nanofiber mat. Strong intermolecular interactions between the PVA matrix and the included ZrP nanofillers were revealed by the attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). The incorporation of ZrP nanofillers drastically improved the thermal stability of the PNC fibers. TGA results demonstrated a clear thermal stability dependence on the aspect ratio of the crystalline ZrP nanofillers. The degradation temperature was increased by 90 C for the ZrP-1500 and 60 C for ZrP-500 when the loading level was increased from 1% to 5%. Furthermore, the viscoelastic properties of the PNC solutions were studied by rheometer.

Lizu, Monira

367

Properties of zirconium carbide for nuclear fuel applications  

NASA Astrophysics Data System (ADS)

Zirconium carbide (ZrC) is a potential coating, oxygen-gettering, or inert matrix material for advanced high temperature reactor fuels. ZrC has demonstrated attractive properties for these fuel applications including excellent resistance against fission product corrosion and fission product retention capabilities. However, fabrication of ZrC results in a range of stable sub-stoichiometric and carbon-rich compositions with or without substantial microstructural inhomogeneity, textural anisotropy, and a phase separation, leading to variations in physical, chemical, thermal, and mechanical properties. The effects of neutron irradiation at elevated temperatures, currently only poorly understood, are believed to be substantially influenced by those compositional and microstructural features further adding complexity to understanding the key ZrC properties. This article provides a survey of properties data for ZrC, as required by the United States Department of Energy's advanced fuel programs in support of the current efforts toward fuel performance modeling and providing guidance for future research on ZrC for fuel applications.

Katoh, Yutai; Vasudevamurthy, Gokul; Nozawa, Takashi; Snead, Lance L.

2013-10-01

368

Structural and electrical properties of zirconium doped yttrium oxide nanostructures  

NASA Astrophysics Data System (ADS)

A synthetic process for the formation of ZrxY1-xOy nanostructures is demonstrated by the reaction of yttrium nitrate hexahydrate with zirconium propoxide. The reactions are carried out at temperature 60C and pressure 0.1 MPa. The energy dispersive X-ray (EDX) spectroscopy measurements confirm formation of ZrxY1-xOy nanostructures and the presence of carbonate and hydroxide species which are removed after high temperature anneals. It was found that the oxygen pressure during synthesis plays a determinant role on the structural properties of the nanostructure. This effect is further studied by atomic force microscopy (AFM) measurements and scanning electron microscope (SEM), which showed the formation of an isotopically organized structure. X-ray diffraction (XRD) measurement reveals that these changes in the nanostructural efficiency are associated with structural and compositional changes among the substrate. The dielectric constant as measured by the capacitance-voltage (C-V) technique is estimated to be around 39.05. C-V measurements taken at 1 MHz show the maximum capacitance for the Zr0.05Y0.95Oy film. The leakage current densities were below 10-5 A/cm2 for the Zr0.05Y0.95Oy film.

Bahari, Ali; Ebrahimzadeh, Masoud; Gholipur, Reza

2014-04-01

369

SURFACE MODIFICATION OF ZIRCALOY-4 SUBSTRATES WITH NICKEL ZIRCONIUM INTERMETALLICS  

SciTech Connect

Surfaces of Zircaloy-4 (Zr-4) substrates were modified with nickel-zirconium (NiZr) intermetallics to tailor oxidation performance for specialized applications. Surface modification was achieved by electroplating Zr-4 substrates with nickel (Ni) and then performing thermal treatments to fully react the Ni plating with the substrates, which resulted in a coating of NiZr intermetallics on the substrate surfaces. Both plating thickness and thermal treatment were evaluated to determine the effects of these fabrication parameters on oxidation performance and to identify an optimal surface modification process. Isothermal oxidation tests were performed on surface-modified materials at 290, 330, and 370C under a constant partial pressure of oxidant (i.e., 1 kPa D2O in dry Ar at 101 kPa) for 64 days. Test results revealed an enhanced, transient oxidation rate that decreased asymptotically toward the rate of the Zr-4 substrate. Oxidation kinetics were analyzed from isothermal weight gain data, which were correlated with microstructure, hydrogen pickup, strength, and hardness.

Luscher, Walter G.; Gilbert, Edgar R.; Pitman, Stan G.; Love, Edward F.

2013-02-01

370

Zirconium phosphate waste forms for low-temperature stabilization of cesium-137-containing waste streams  

SciTech Connect

Novel chemically bonded phosphate ceramics are being developed and fabricated for low-temperature stabilization and solidification of waste streams that are not amenable to conventional high-temperature stabilization processes because volatiles are present in the wastes. A composite of zirconium-magnesium phosphate has been developed and shown to stabilize ash waste contaminated with a radioactive surrogate of {sup 137}Cs. Excellent retainment of cesium in the phosphate matrix system was observed in Toxicity Characteristic Leaching Procedure tests. This was attributed to the capture of cesium in the layered zirconium phosphate structure by intercalation ion-exchange reaction. But because zirconium phosphate has low strength, a novel zirconium/magnesium phosphate composite waste form system was developed. The performance of these final waste forms, as indicated by compression strength and durability in aqueous environments, satisfy the regulatory criteria. Test results indicate that zirconium-magnesium-phosphate-based final waste forms present a viable technology for treatment and solidification of cesium-contaminated wastes.

Singh, D.; Wagh, A.S.; Tlustochowicz

1996-04-01

371

Federal budget: Look out 1996; here comes fiscal '97  

NASA Astrophysics Data System (ADS)

The contradictions are everywhere. A 1997 federal budget proposal has been issued, but the 1996 budget still has not been passed. All of Washington is in a budget-cutting mood, but thinking in a election year mode. And while discretionary fundingparticularly for scienceis under siege, just about every federal agency is asking for more money.On March 18, President Bill Clinton delivered a detailed budget request for fiscal 1997 (FY '97) and a plan for 1998-2002. The Executive Branch and all its agencies are asking Congress for $1.65 trillion to spend in FY '97, roughly 4% more than is expected to be spent in FY '96. The budget deficit for FY '97 is estimated to be about $140 billion.

Carlowicz, Michael

372

STS-97 crew arrives at KSC for launch  

NASA Technical Reports Server (NTRS)

At the Shuttle Landing Facility, STS-97 Pilot Michael Bloomfield climbs out of the cockpit of a T-38 jet aircraft he flew from Johnson Space Center. He and the rest of the crew have returned to KSC for the launch, scheduled for Nov. 30 at about 10:06 p.m. EST. Mission STS-97is the sixth construction flight to the International Space Station. Its payload includes the P6 Integrated Truss Structure and a photovoltaic (PV) module, with giant solar arrays that will provide power to the Station. The mission includes two spacewalks to complete the solar array connections. STS-97 is scheduled to launch Nov. 30 at about 10:06 p.m. EST.

2000-01-01

373

STS-97 crew arrives at KSC for launch  

NASA Technical Reports Server (NTRS)

After arriving at the Shuttle Landing Facility, the STS-97 crew gather to address the media. At the microphone, Commander Brent Jett praises the efforts of the KSC workers to get ready for the launch. Behind Jett are Pilot Michael Bloomfield and Mission Specialists Joseph Tanner, Carlos Noriega and Marc Garneau, who is with the Canadian Space Agency. Mission STS-97 is the sixth construction flight to the International Space Station. Its payload includes the P6 Integrated Truss Structure and a photovoltaic (PV) module, with giant solar arrays that will provide power to the Station. The mission includes two spacewalks to complete the solar array connections. STS-97 is scheduled to launch Nov. 30 at about 10:06 p.m. EST.

2000-01-01

374

STS-97 crew arrives at KSC for launch  

NASA Technical Reports Server (NTRS)

At the Shuttle Landing Facility, STS-97 Mission Specialist Marc Garneau, who is with the Canadian Space Agency, climbs down from a T-38 jet aircraft that brought him to KSC from Johnson Space Center. He and the rest of the crew have returned to KSC for the launch, scheduled for Nov. 30 at about 10:06 p.m. EST. Mission STS-97is the sixth construction flight to the International Space Station. Its payload includes the P6 Integrated Truss Structure and a photovoltaic (PV) module, with giant solar arrays that will provide power to the Station. The mission includes two spacewalks to complete the solar array connections. STS-97 is scheduled to launch Nov. 30 at about 10:06 p.m. EST.

2000-01-01

375

STS-97 crew arrives at KSC for launch  

NASA Technical Reports Server (NTRS)

At the Shuttle Landing Facility, STS-97 Mission Specialist Joseph Tanner (left) is greeted by Center Director Roy Bridges on his arrival at KSC from Johnson Space Center. Tanner and the rest of the crew have returned to KSC for the launch, scheduled for Nov. 30 at about 10:06 p.m. EST. Mission STS-97is the sixth construction flight to the International Space Station. Its payload includes the P6 Integrated Truss Structure and a photovoltaic (PV) module, with giant solar arrays that will provide power to the Station. The mission includes two spacewalks to complete the solar array connections. STS-97 is scheduled to launch Nov. 30 at about 10:06 p.m. EST.

2000-01-01

376

Tank 241-AP-107, grab samples 7AP-97-1, 7AP-97-2 and 7AP-97-3 analytical results for the final report  

SciTech Connect

This document is the final report for tank 241-AP-107 grab samples. Three grab samples were collected from riser 1 on September 11, 1997. Analyses were performed on samples 7AP-97-1, 7AP-97-2 and 7AP-97-3 in accordance with the Compatibility Grab Sampling and Analysis Plan (TSAP) (Sasaki, 1997) and the Data Quality Objectives for Tank Farms Waste Compatibility Program (DQO) (Rev. 1: Fowler, 1995; Rev. 2: Mulkey and Nuier, 1997). The analytical results are presented in the data summary report (Table 1). A notification was made to East Tank Farms Operations concerning low hydroxide in the tank and a hydroxide (caustic) demand analysis was requested. The request for sample analysis (RSA) (Attachment 2) received for AP-107 indicated that the samples were polychlorinated biphenyl (PCB) suspects. Therefore, prior to performing the requested analyses, aliquots were made to perform PCB analysis in accordance with the 222-S Laboratory administrative procedure, LAP-101-100. The results of this analysis indicated that no PCBs were present at 50 ppm and analysis proceeded as non-PCB samples. The results and raw data for the PCB analysis will be included in a revision to this document. The sample breakdown diagrams (Attachment 1) are provided as a cross-reference for relating the tank farm customer identification numbers with the 222-S Laboratory sample numbers and the portion of sample analyzed.

Steen, F.H.

1997-12-22

377

High temperature oxidation of zirconium and zircaloy-4 under applied load: Nuclear microprobe study of the growth of the oxide  

Microsoft Academic Search

The understanding of the mechanisms of high temperature growth of zirconium oxide on zircaloy alloys is of considerable importance owing to the world-wide use of zirconium in nuclear plants. Spallations and growth recovery are known to originate in structural changes of the oxide, but the induced modifications in the oxygen transport have still to be investigated. The zirconia is known

P. Berger; R. El Tahhann; G. Moulin; M. Viennot

2003-01-01

378

Wycheproofite: A New Hydrated Sodium Aluminium Zirconium Phosphate from Wycheproof, Victoria, Australia, and a New Occurrence Of Kosnarite  

Microsoft Academic Search

Wycheproofite is a new hydrated sodium aluminium zirconium phosphate from a pegmatite vein in granite at Wycheproof, in northwestern Victoria, Australia. The mineral occurs as compact, finely fibrous masses in small cavities in the quartzjfeldsparjmuscovitejschorl-bearing pegmatite. The fibrous crystals are between 5 and 10 11mwide and up to several rom long. Accompanying minerals include two other zirconium phosphates - kosnarite

William D. Birch; ALLAN PRING; D. J. M. BEVAN

1994-01-01

379

Chemical Behaviour of Zirconium Oxychloride Octahydrate and Acetic Acid in Precursor Solution for Zirconia Film Formation on Glass  

Microsoft Academic Search

Precursor solutions for zirconia films on soda lime silica glass substrate were prepared from zirconium oxychloride octahydrate (ZOO) and acetic acid (HOAC) maintaining the mol ratios, [HOAC]\\/[ZOO] = 2, 4, 6, 8 and 10. A characteristic UV absorption band at ~280 nm in the ~120 h aged precursor solutions was identified for acetate group of the zirconium acetato complexed species.

Sunirmal Jana; K. Biswas

1997-01-01

380

THE JOURNAL OF CHEMICAL PHYSICS 135, 104303 (2011) The visible spectrum of zirconium dioxide, ZrO2  

E-print Network

THE JOURNAL OF CHEMICAL PHYSICS 135, 104303 (2011) The visible spectrum of zirconium dioxide, ZrO2; published online 8 September 2011) The electronic spectrum of a cold molecular beam of zirconium dioxide, Zr to difficulties of generation and detection of these ephemeral molecules. The dioxides can have one of three

Maier, John Paul

381

Hydrogen Embrittlement in Zirconium: a Quasi-Continuum Density Functional Theory Study  

NASA Astrophysics Data System (ADS)

The hydrogen embrittlement in Zirconium becomes a very important and emergent issue for academia, industry and policy makers as a result of the Japan nuclear accident. The hydride formation, diffusion and embrittlement in zircolay will impact dramatically on the development of advanced nuclear energy systems, the life time extension of the current nuclear fleet and dry storage of spent nuclear fuel. Quasi-Continuum Density Functional Theory (QCDFT) is a powerful concurrent multiscale method based entirely on density functional theory (DFT) and allows quantum simulations of materials properties of a large system with billions of atoms. Using QCDFT modeling, we found that the presents of hydrogen at the cracktip of zirconium, both on crack surface and in-bulk, will form zirconium hydrides and embrittle the system. The concentration of hydrogen and orientation of crack plays important roles in such embrittlement. The mechanism of hydrogen embrittlement under various loading conditions will be discussed.

Peng, Q.

2012-02-01

382

Theoretical study of the reaction between 2,2???,4???-trihydroxyazobenzene-5-sulfonic acid and zirconium  

USGS Publications Warehouse

Zirconium reacts with 2,2???,4???-trihydroxyazobenzene-5-sulfonic acid in acid solutions to Form two complexes in which the ratios of dye to zirconium are 1 to 1 and 2 to 1. Both complexes are true chelates, with zirconium acting as a bridge between the two orthohydroxy dye groups. Apparent equilibrium constants for the reactions to form each of the complexes are determined. The reactions are used as a basis for the determination of the active component in the dye and a graphical method for the determination of reagent purity is described. Four absorption spectra covering the wave length region from 350 to 750 m?? are given, which completely define the color system associated with the reactions in solutions where the hydrochloric acid concentration ranges from 0.0064N to about 7N.

Fletcher, M.H.

1960-01-01

383

Porous desulfurization sorbent pellets containing a reactive metal oxide and an inert zirconium compound  

SciTech Connect

Sorbent pellets for removing hydrogen sulfide from coal gas are prepared by combining a reactive oxide, in particular zinc oxide, with a zirconium compound such as an oxide, silicate, or aluminate of zirconium, and an inorganic binder and pelletizing and calcining the mixture. Alternately, the zinc oxide may be replaced by copper oxide or a combination of copper, molybdenum, and manganese oxides. The pellet components may be mixed in dry form, moistened to produce a paste, and converted to pellets by forming an aqueous slurry of the components and spray drying the slurry, or the reactive oxide may be formed on existing zirconium-containing catalyst-carrier pellets by infusing a solution of a salt of the active metal onto the existing pellets and firing at a high temperature to produce the oxide. Pellets made according to this invention show a high reactivity with hydrogen sulfide and durability such as to be useful over repeated cycles of sorption and regeneration.

Gardner, Todd H.; Gasper-Galvin, Lee D.

1996-12-01

384

A novel zirconium K{alpha} imager for high energy density physics research  

SciTech Connect

We report on the development and characterization of a zirconium K{alpha} imager for high energy density physics research. The imager consists of a spherically bent quartz crystal operating at 15.7 keV photon energy. We compare the performance of the imager in terms of integrated reflectivity (R{sub int}) and temperature dependent collection efficiency ({eta}{sub Te}) to that of the widely used Cu K{alpha} imager. Our collisional-radiative simulations show that the new imager can be reliably used up to 250 eV plasma temperature. Monte Carlo simulations show that for a 25 {mu}m thick tracer layer of zirconium, the contribution to K{alpha} production from photo-pumping is only 2%. We present, for the first time, 2D spatially resolved images of zirconium plasmas generated by a high intensity short pulse laser interacting with Zr solid targets.

Akli, K. U.; Jiang, S.; Storm, M. S.; Krygier, A.; Freeman, R. R. [The Ohio State University, Columbus, Ohio 43210 (United States); Sanchez del Rio, M. [European Synchrotron Radiation Facility (France); Stephens, R. B. [General Atomics, San Diego, California 92121 (United States); Pereira, N. R. [Ecopulse Inc., Springfield, Virginia 22152 (United States); Baronova, E. O. [RRC Kurchatov Institute, Moscow (Russian Federation); Theobald, W. [Laboratory for Laser Energetics, Rochester, New York 14623 (United States); Ping, Y.; McLean, H. S.; Patel, P. K.; Key, M. H. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2011-12-15

385

Determination of fluoride in water - A modified zirconium-alizarin method  

USGS Publications Warehouse

A convenient, rapid colorimetric procedure using the zirconium-alizarin indicator acidified with sulfuric acid for the determination of fluoride in water is described. Since this acid indicator is stable indefinitely, it is more useful than other zirconium-alizarin reagents previously reported. The use of sulfuric acid alone in acidifying the zirconium-alizarin reagent makes possible the maximum suppression of the interference of sulfate. Control of the pH of the samples eliminates errors due to the alkalinity of the samples. The fluoride content of waters containing less than 500 parts per million of sulfate and less than 1000 p.p.m. of chloride may be determined within a limit of 0.1 p.p.m. when a 100-ml. sample is used.

Lamar, W.L.

1945-01-01

386

Bayesian model selection validates a biokinetic model for zirconium processing in humans  

PubMed Central

Background In radiation protection, biokinetic models for zirconium processing are of crucial importance in dose estimation and further risk analysis for humans exposed to this radioactive substance. They provide limiting values of detrimental effects and build the basis for applications in internal dosimetry, the prediction for radioactive zirconium retention in various organs as well as retrospective dosimetry. Multi-compartmental models are the tool of choice for simulating the processing of zirconium. Although easily interpretable, determining the exact compartment structure and interaction mechanisms is generally daunting. In the context of observing the dynamics of multiple compartments, Bayesian methods provide efficient tools for model inference and selection. Results We are the first to apply a Markov chain Monte Carlo approach to compute Bayes factors for the evaluation of two competing models for zirconium processing in the human body after ingestion. Based on in vivo measurements of human plasma and urine levels we were able to show that a recently published model is superior to the standard model of the International Commission on Radiological Protection. The Bayes factors were estimated by means of the numerically stable thermodynamic integration in combination with a recently developed copula-based Metropolis-Hastings sampler. Conclusions In contrast to the standard model the novel model predicts lower accretion of zirconium in bones. This results in lower levels of noxious doses for exposed individuals. Moreover, the Bayesian approach allows for retrospective dose assessment, including credible intervals for the initially ingested zirconium, in a significantly more reliable fashion than previously possible. All methods presented here are readily applicable to many modeling tasks in systems biology. PMID:22863152

2012-01-01

387

Laboratory and Clinical Performance of Oxidized Zirconium Alloy  

PubMed Central

Introduction: More demanding performance expectations in total joint arthroplasty are driving the development of alternative bearing materials. The original and still most popular choice for an articulating couple is a metal cobalt-chromium alloy (CoCr) articulating against ultra-high molecular weight polyethylene (UHMWPE). Attempts have been made to harden the CoCr surface to resist roughening and reduce friction in order to reduce the wear of the UHMWPE counterface. Unfortunately, the durability of the hardened CoCr surfaces has been less than desired. By the early 1990s, the use of alumina and zirconia ceramics as a replacement for the metal counterface in hip arthroplasty was shown to reduce polyethylene wear. However, the usage of ceramic components remains limited by the lower toughness of the material, particularly in the complex geometries typical of knee arthroplasty components. In 1997, a metallic zirconium alloy (Zr-2.5Nb) with a ceramic surface was introduced as an alternative to CoCr for the knee femoral component. Through a thermally-driven oxidation process, oxygen diffuses into the surface of the metal and transforms it to monoclinic zirconia to a depth of approximately 5 microns. This oxidized zirconium (OxZr) product offers the benefit of an articulating ceramic surface with the toughness of metal. The goal of this abstract is to compare the mechanical performance of OxZr to conventional orthopaedic materials with respect to mechanical and clinical performances. Mechanical performance: The surface hardness of OxZr and CoCr was measured with a nano-indentation method, indicating that the OxZr surface is over two times harder than that of the CoCr. The harder surface resists roughening and also is very durable. These characteristics were demonstrated in abrasion testing against bone cement pins where OxZr produced 4900 times less volumetric wear and 160 times less roughness after 10 million cycles of articulation. The coefficient of friction against UHMWPE for OxZr is nearly half that of CoCr. Contributing to this behavior is the improved wetting behavior of fluids on OxZr surfaces compared to CoCr surfaces. These positive attributes of OxZr are shown in the Figure 1. Because of OxZrs improved resistance to abrasion, low friction and high wettability, the wear of UHMWPE was demonstrated to be 40 to 90% less in numerous hip and knee wear simulator tests. In addition, mechanical testing demonstrates that OxZr components do not exhibit brittle fracture and knee femoral components have equivalent device fatigue strength to CoCr components of the same size and design. The alloy contains two of the most biocompatable elements (Zr and Nb) OxZr components have undetactable amount of nickel and therefore offers an attractive option for metal sensitive patients. Clinical performance: Since the first OxZr total knee arthroplasty surgery in late 1997, over 225,000 femoral components have been implanted. This is in addition to over 110,000 OxZr hip replacements. Several clinical studies have shown that the patient performance is at least equivalent to that of CoCr patients at short and medium-term follow up. A much longer time period will be required to measure differences in UHMWPE wear and implant survivorship. Conclusions: The advantage of the OxZr material over conventional orthopaedic materials was highlighted in these laboratory studies. In clinical usage, OxZr is expected to provide the wear benefits of a monolithic ceramic without the associated mechanical limitations.

Salehi, A.; Hunter, G.

2010-01-01

388

VOC RADIOCARBON MEASUREMENTS DURING SCOS97 AND EMISSIONS INVENTORY VALIDATION  

EPA Science Inventory

Radiocarbon (14C) measurements provide an estimate of the fraction of carbon in a sample that is biogenic. In September 1997 during SCOS97 a series of 3-h canister samples of ambient air were collected at the Azusa air monitoring station during morning and afternoon periods. ...

389

SPECIALSPECIALREPORTREPORT97-197-1 Frost Shielding Protection of a  

E-print Network

SPECIALSPECIALREPORTREPORT97-197-1 Frost Shielding Protection of a Water Line, Berlin, New lines beneath the frost line in cold regions can be expensive when ledge or other difficult mate- rial was developed to predict frost penetration depth around buried utility pipelines. The program was How to get

Horvath, John S.

390

40 CFR 97.384 - Opt-in process.  

Code of Federal Regulations, 2010 CFR

...NOX AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.384 Opt-in...the unit is withdrawn from the CAIR NOX Ozone Season Trading Program in accordance with...on which the unit enters the CAIR NOX Ozone Season Trading Program under ...

2010-07-01

391

Environmental Health Perspectives Vol. 97, pp. 259-267, 1992  

E-print Network

and inorganic arsenic are present in varying amounts in food. Fish, forexample, contain relatively high conEnvironmental Health Perspectives Vol. 97, pp. 259-267, 1992 Cancer Risks from Arsenic in Drinking risks due to arsenic in U.S. water supplies may be comparable to those fromenvironmentaltobacco smokeand

California at Berkeley, University of

392

Running Start Annual Progress Report, 1996-97.  

ERIC Educational Resources Information Center

The Running Start program was created by the 1990 Washington State Legislature to expand educational options for public school students. Running Start allows eleventh and twelfth grade high school students to take college-level courses, tuition-free, at the 32 community and technical colleges in Washington. This annual progress report for 1996-97

Crossland, Ron

393

27 CFR 70.97 - Failure to pay tax.  

Code of Federal Regulations, 2010 CFR

...97 Failure to pay tax. (a) Negligence (1) General. If any part...paragraph (d) of this section) is due to negligence or disregard of rules or regulations...underpayment which is attributable to negligence for the period beginning on the...

2010-04-01

394

Meteoritics 23, 97 (1988) Meteoritical Society, 1988. Printed in USA  

E-print Network

Meteoritics 23, 97 (1988) © Meteoritical Society, 1988. Printed in USA Tribute to Carleton Moore This issue of Meteoritics presents a new format and a new editor. It represents change and growth of the diverse interests of The Meteoritical Society, but it is based on the traditions of the Society

Martin, Alain

395

Exp Brain Res (1993)97:23-30 Experimental  

E-print Network

. Stimulation of branches of the trigeminal nerves or mechanical stimulation of facial skin readily excites neck of the large dorsal neck muscles was examined, mechanical stimulation of the PN or electrical stimulationExp Brain Res (1993)97:23-30 Experimental BrainResearch0Springer-Verlag1993 Facial input to neck

Loeb, Gerald E.

396

28 CFR 2.97 - Withdrawal of order of release.  

Code of Federal Regulations, 2010 CFR

...Parolees 2.97 Withdrawal of order of release. If, after an order for release from active supervision under former 2.95 has been issued by the Commission, and prior to the expiration date of the sentence(s) being served, the...

2010-07-01

397

Miscellaneous Paper A-97-3 us Army Corps  

E-print Network

---- - ---- - --- -- - -- - -- - -- - -- m Miscellaneous Paper A-97-3 March 1997 us Army Corps; Distribution Is Unlimited. Prepared for Headquarters, U.S. Army Corps of Engineers #12;The contents, R. Michael Smart U.S. Army Corps of Engineers Waterways Experiment Station 3909 Halls Ferry Road

US Army Corps of Engineers

398

Technical Report A-97-3 I 1 September 1997  

E-print Network

[n) Technical Report A-97-3 I 1 September 1997 Itfill US Army Corps of Engineers Waterways Prepared for Headquarters, U.S. Army Corps of Engineers #12;The contentsofthisreportare not to be used Pathogen Biocontrol Research on Submersed Macrophytes: Status Report 1996 by Judy F. Shearer U.S. Army

US Army Corps of Engineers

399

Miscellaneous Paper A-97-7 September 1997  

E-print Network

Paper A-97-7 September 1997 ~ US Army Corps of Engineers Waterways Experiment Station Aquatic Plant -....---- _ .. .~ Prepared for Headquarters, U.S. Army Corps of Engineers #12;The contents of this report are not to be used. Gary O. Dick U.S. Army Corps of Engineers Waterways Experiment Station 3909 Halls Ferry Road

US Army Corps of Engineers

400

97. Reproduction from glass plate negative (Modjeski and Masters office, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

97. Reproduction from glass plate negative (Modjeski and Masters office, Modjeski Collection, No. 180, May 20, 1908) LOADING BEAMS OF WILLAMETTE BRIDGE DRAW SPAN - Burlington Northern Railroad Bridge, Spanning Willamette River at River Mile 6.9, Portland, Multnomah County, OR

401

40 CFR 97.507 - Computation of time.  

...AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.507 Computation...period scheduled, under the TR NOX Ozone Season Trading Program, to begin on the occurrence...period scheduled, under the TR NOX Ozone Season Trading Program, to begin before...

2014-07-01

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40 CFR 97.382 - CAIR designated representative.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.382 CAIR designated...representative. Any CAIR NOX Ozone Season opt-in unit, and any unit for...source as one or more CAIR NOX Ozone Season units shall have the same CAIR...

2014-07-01

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40 CFR 97.340 - State trading budgets.  

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Allocations 97.340 State...annual allocations of CAIR NOX Ozone Season allowances for the control periods in...for the inclusion in the CAIR NOX Ozone Season Trading Program of all units that...

2014-07-01

404

40 CFR 97.382 - CAIR designated representative.  

Code of Federal Regulations, 2011 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.382 CAIR designated...representative. Any CAIR NOX Ozone Season opt-in unit, and any unit for...source as one or more CAIR NOX Ozone Season units shall have the same CAIR...

2011-07-01

405

40 CFR 97.505 - Retired unit exemption.  

...AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.505 Retired...exemption. (a)(1) Any TR NOX Ozone Season unit that is permanently retired shall...effective the day on which the TR NOX Ozone Season unit is permanently retired....

2014-07-01

406

40 CFR 97.534 - Recordkeeping and reporting.  

...AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.534 Recordkeeping...owner or operator of a TR NOX Ozone Season unit shall comply with requirements of...follows: (1) If the TR NOX Ozone Season unit is subject to the Acid Rain...

2014-07-01

407

40 CFR 97.340 - State trading budgets.  

Code of Federal Regulations, 2010 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Allocations 97.340 State...annual allocations of CAIR NOX Ozone Season allowances for the control periods in...for the inclusion in the CAIR NOX Ozone Season Trading Program of all units that...

2010-07-01

408

40 CFR 97.340 - State trading budgets.  

Code of Federal Regulations, 2011 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Allocations 97.340 State...annual allocations of CAIR NOX Ozone Season allowances for the control periods in...for the inclusion in the CAIR NOX Ozone Season Trading Program of all units that...

2011-07-01

409

40 CFR 97.382 - CAIR designated representative.  

Code of Federal Regulations, 2010 CFR

...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Opt-in Units 97.382 CAIR designated...representative. Any CAIR NOX Ozone Season opt-in unit, and any unit for...source as one or more CAIR NOX Ozone Season units shall have the same CAIR...

2010-07-01

410

40 CFR 97.528 - Administrator's action on submissions.  

...AND SO2 TRADING PROGRAMS TR NOX Ozone Season Trading Program 97.528 Administrator's...any submission under the TR NOX Ozone Season Trading Program and make appropriate...Administrator may deduct TR NOX Ozone Season allowances from or transfer TR NOX...

2014-07-01

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Radiation Protection Dosimetry Vol. 97, No. 1, pp. 6973 (2001)  

E-print Network

69 Radiation Protection Dosimetry Vol. 97, No. 1, pp. 69­73 (2001) Nuclear Technology Publishing BIOMARKERS SPECIFIC TO DENSELY-IONISING (HIGH LET) RADIATIONS D. J. Brenner, N. Okladnikova, P. Hande, L -- There have been several suggestions of biomarkers that are specific to high LET radiation. Such a biomarker

Brenner, David Jonathan

412

7 CFR 97.700 - Public interest in wide usage.  

Code of Federal Regulations, 2011 CFR

...TESTING PROGRAMS PLANT VARIETY AND PROTECTION Public Use Declaration 97...the members of the Plant Variety Protection...a variety open to use by the public. Any...a variety open to use by the public will...the members of the Plant Variety...

2011-01-01

413

CITI Technical Report 97-2 Provably Secure Videoconferencing  

E-print Network

infrastructure, such as secure naming and routing, which are rare in today's Internet except in isolated of today's Internet, so we must compress the video stream. Then we need to encrypt it. SecureCITI Technical Report 97-2 Provably Secure Videoconferencing Peter Honeyman Andy Adamson Kevin

Michigan, University of

414

97. Catalog B, Higher Plants, 200 2 American Chestnut Tree, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

97. Catalog B, Higher Plants, 200 2 American Chestnut Tree, Negative No. 6032 (Photographer and date unknown) THIS GHOST FOREST OF BLIGHTED CHESTNUTS ONCE STOOD APPROXIMATELY AT THE LOCATION OF THE BYRD VISITOR CENTER. - Skyline Drive, From Front Royal, VA to Rockfish Gap, VA , Luray, Page County, VA

415

Programming in Standard ML '97: A Tutorial Introduction  

E-print Network

Programming in Standard ML '97: A Tutorial Introduction Stephen Gilmore Laboratory for Foundations, Stephen Gilmore. Copyright and all rights therein are maintained by the author, notwith- standing that he Science The James Clerk Maxwell Building The King's Buildings University of Edinburgh Edinburgh EH9 3JZ

Gilmore, Stephen

416

Programming in Standard ML '97: A Tutorial Introduction  

E-print Network

Programming in Standard ML '97: A Tutorial Introduction Stephen Gilmore Laboratory for Foundations, Stephen Gilmore. Copyright and all rights therein are maintained by the author, notwith- standing that he The James Clerk Maxwell Building The King's Buildings University of Edinburgh Edinburgh EH9 3JZ, UK Email

Gilmore, Stephen

417

46 CFR 97.35-3 - Logbooks and records.  

Code of Federal Regulations, 2010 CFR

46 Shipping 4 2010-10-01 2010-10-01...35-3 Section 97.35-3 Shipping COAST GUARD, DEPARTMENT...regulations in this subchapter. Such logs or records are not filed...maintained with the vessel's logs for the period of...

2010-10-01

418

46 CFR 97.15-17 - Loading doors.  

Code of Federal Regulations, 2010 CFR

46 Shipping 4 2010-10-01 2010-10-01...15-17 Section 97.15-17 Shipping COAST GUARD, DEPARTMENT...master shall enter into the log book the time and door location...master shall enter into the log book any opening of the...

2010-10-01

419

36 CFR 1192.97 - Interior circulation, handrails and stanchions.  

...TRANSPORTATION VEHICLES Commuter Rail Cars and Systems 1192.97 Interior circulation...shall be provided in the entrance to the car in a configuration which allows passengers to grasp such assists from outside the car while starting to board, and to...

2014-07-01

420

14 CFR 121.97 - Airports: Required data.  

Code of Federal Regulations, 2011 CFR

14 Aeronautics and Space 3 2011-01-01 2011-01-01...121.97 Aeronautics and Space FEDERAL AVIATION ADMINISTRATION...clearways and stopways. (i)Dimensions. (ii)Surface. (iii... (i)Location. (ii)Dimensions. (iii)Takeoff or...

2011-01-01

421

National Geodetic Survey Equations for Transforming ITRF97 Positional Coordinates  

NSDL National Science Digital Library

This page, posted October 23, 2000, lists equations for transforming ITRF97 positional coordinates (XI, YI, ZI) at a specified epoch date (denoted t) to their corresponding NAD 83 values (XN, YN, ZN) at this same epoch date and gives a short explanation with hypertext references. Both the United States' National Geodetic Survey and Canada's Geodetic Survey Division have adopted the equations.

2000-01-01

422

Miscellaneous Paper A-97-1 January 1997  

E-print Network

Control Miscellaneous Paper A-97-1 Research Program January 1997 Assessment of Fungal Pathogens Corps of Engineers Waterways Experiment . Station Aquatic Plant Control Research Program Assessment of Fungal Pathogens as Biocontrol Agents of Myriophyllum spicatum by J. L. Harvey, Harry C. Evans

US Army Corps of Engineers

423

Thermal expansion behaviour of sodium zirconium phosphate structure type phosphates containing tin  

SciTech Connect

Thermal expansion behaviour of sodium zirconium phosphate structure type phosphates of the formula AM{sup 3+}SnP{sub 3}O{sub 12} (A=Ca, Sr and Ba; M{sup 3+}=Cr and Fe) was studied by high temperature X-ray diffraction and dilatometry in the temperature range 298-1073 K. The variation in the hexagonal lattice parameters of the Ca-containing compounds is in line with the 'sodium zirconium phosphate behaviour'. However, the strontium- and barium-containing compounds display an altogether different behaviour of axial expansion. The results are explained based on the crystal chemistry of these compounds.

Buvaneswari, G.; Govindan Kutty, K.V.; Varadaraju, U.V

2004-03-01

424

Growth of Zirconium Silicate Thin Film by Pulsed-Mocvd Using Ztb and Tdeas  

NASA Astrophysics Data System (ADS)

Zirconium silicate (ZrxSi1-xO2) thin films were deposited by pulsed metal-organic chemical vapor deposition (MOCVD) using zirconium tert-butoxide (ZTB) and tetrakis-diethylamido silane (TDEAS). The growth temperature of 200-300C was used to deposit films with uniform thickness. The grown films showed the Zr-rich composition, which is thought to induce the Zr-silicide formation at the interface of the silicate and Si substrate. The film composition and chemical binding states were investigated by XPS depth profiling measurements.

Kim, Jaehyun; Yong, Kijung

425

Stainless steel-zirconium waste forms from electrometallurgical treatment of spent nuclear fuel.  

SciTech Connect

Stainless steel-zirconium waste-form alloys have been developed for the disposal of metallic wastes recovered from spent nuclear fuel using the electrometallurgical process developed by Argonne National Laboratory. The metal waste comprises the spent-fuel cladding, noble-metal fission products, and other metallic constituents remaining after electrorefining. Two nominal waste-form compositions have been selected: stainless steel-clad fuels and zirconium-8 wt.% stainless steel for Zircaloy-clad fuels. These alloys are very corrosion resistant. Tests performed with these alloys indicate favorable behavior for use high-level nuclear waste forms.

McDeavitt, S. M.; Abraham, D. P.; Park, J. Y.; Keiser, D. D., Jr.; Chemical Engineering

1997-01-01

426

Rubidium and Zirconium Production in Massive AGB Stars  

SciTech Connect

A recent survey of a large sample of massive Galactic asymptotic giant branch (AGB) stars shows that significant overabundances of rubidium (up to 100 times solar), but merely solar zirconium, are present in these stars. These observations can set constraints on our theoretical notion of the slow neutron capture process (the s process) in AGB stars, as well as on the rates of the neutron capture reactions involved in the production of Rb and Zr. We use the Monash nucleosynthesis code with a recently extended network to try to reproduce these observations. We present results for AGB stars of masses 5, 6, and 6.5 M{center_dot} and solar metallicity. We also show results for different available choices of the neutron capture rates, as well as for the possible inclusion of a partial mixing zone (PMZ), leading to the activation of the {sup 13}C neutron source. We find increasing Rb overabundances with increasing stellar mass, as observed, but we are far from matching the highest observed Rb enhancements. Inclusion of a PMZ increases the Rb abundance, but also produces an overabundance of Zr, contrary to what is observed. Only if the third dredge up efficiency remains as high as before the onset of the superwind phase during the final few pulses of a massive AGB star, can we match the highest [Rb/Fe] ratios observed by Garcia-Hernandez et al. [l]. A better understanding of the third dredge up efficiency with decreasing envelope mass for massive AGB stars is essential for further investigation of this issue.

Raai, M. A. van; Lugaro, M. [Sterrekundig Instituut, University of Utrecht, Postbus 80000, 3508 TA Utrecht (Netherlands); Karakas, A. I. [Research School of Astronomy and Astrophysics, Mt. Stromlo Observatory, Cotter Rd., Weston, ACT (Australia); Garcia-Hernandez, D. A. [lnstituto de Astrofisica de Canarias, La Laguna (Tenerife) (Spain)

2008-04-06

427

40 CFR 97.115 - Delegation by CAIR designated representative and alternate CAIR designated representative.  

Code of Federal Regulations, 2010 CFR

... 97.115 Section 97.115 Protection of Environment...for CAIR NOX Sources 97.115 Delegation by CAIR designated...that includes the following elements: (1) The name, address...delegation under 40 CFR 97.115(d) shall be deemed to be...

2010-07-01

428

Low Temperature Chemical Vapor Deposition of Zirconium Nitride in a Fluidized Bed  

E-print Network

(dimethylamino)zirconium (TDMAZ) and ammonia gas as precursors at atmospheric pressure. Tungsten wires and zirconia-silica (ZrO2-SiO2) microspheres were used as the substrates for the coating experiments. The substrate temperature and precursor gas flow were manipulated...

Arrieta, Marie

2012-10-19

429

Bonding Interactions Generated by Halogen Oxidation of Zirconium(IV) Redox-Active Ligand Complexes  

E-print Network

-based redox activity.1 Three basic oxidation states domi- nate the coordination chemistry of catecholate· -· Bonding Interactions Generated by Halogen Oxidation of Zirconium(IV) Redox-Active Ligand of pdaLi2 with ZrCl4, reacts rapidly with halogen oxidants to afford the new product ZrX2(disq)2 (3, X

Baik, Mu-Hyun

430

The 5-year Results of an Oxidized Zirconium Femoral Component for TKA  

PubMed Central

Osteolysis secondary to polyethylene wear is one of the major factors limiting long-term performance of TKA. Oxidized zirconium is a new material that combines the strength of a metal with the wear properties of a ceramic. It remains unknown whether implants with a zirconium femoral component can be used safely in TKA. To answer that question, we reviewed, at a minimum of 5years, the clinical outcome and survivorship of a ceramic-surfaced oxidized zirconium femoral component implanted during 98 primary TKAs between April 2001 and December 2003. Survivorship was 98.7% at 7years postoperatively. No revision was necessary and only one component failed because of aseptic loosening. Mean Knee Society score improved from 36 to 89. No adverse events were observed clinically or radiologically. These results justify pursuing the use of oxidized zirconium as an alternative bearing surface for a femoral component in TKA. Level of Evidence: Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence. PMID:19798541

Innocenti, Massimo; Carulli, Christian; Matassi, Fabrizio; Villano, Marco

2009-01-01

431

Equilibrium isotherms for harmful ions sorption using nano zirconium vanadate ion exchanger  

Microsoft Academic Search

Harmful ions such as cesium, cobalt and nickel were removed from aqueous solutions using nano zirconium vanadate ion exchangers that prepared using three different techniques and their organic hybrids. Different processing parameters that affect on sorption efficiency were studied. All prepared ion exchangers and their composites have high uptake affinity for cesium removal. The removal capacities of the ion exchangers

M. M. Abd El-Latif; M. F. Elkady

2010-01-01

432

Recycle of Zirconium from Used Nuclear Fuel Cladding: A Major Element of Waste Reduction  

SciTech Connect

Feasibility tests were initiated to determine if the zirconium in commercial used nuclear fuel (UNF) cladding can be recovered in sufficient purity to permit re-use, and if the recovery process can be operated economically. Initial tests are being performed with unirradiated, non-radioactive samples of various types of Zircaloy materials that are used in UNF cladding to develop the recovery process and determine the degree of purification that can be obtained. Early results indicate that quantitative recovery can be accomplished and product contamination with alloy constituents can be controlled sufficiently to meet purification requirements. Future tests with actual radioactive UNF cladding are planned. The objective of current research is to determine the feasibility of recovery and recycle of zirconium from used fuel cladding wastes. Zircaloy cladding, which contains 98+% of hafnium-free zirconium, is the second largest mass, on average {approx}25 wt %, of the components in used U.S. light-water-reactor fuel assemblies. Therefore, recovery and recycle of the zirconium would enable a large reduction in geologic waste disposal for advanced fuel cycles. Current practice is to compact or grout the cladding waste and store it for subsequent disposal in a geologic repository. This paper describes results of initial tests being performed with unirradiated, non-radioactive samples of various types of Zircaloy materials that are used in UNF cladding to develop the recovery process and determine the degree of purification that can be obtained. Future tests with actual radioactive UNF cladding are planned.

Collins, Emory D [ORNL; DelCul, Guillermo D [ORNL; Terekhov, Dmitri [ORNL; Emmanuel, N. V. [Chemical Vapor Metal Refining, Inc.

2011-01-01

433

Initial corrosion evaluation of zirconium alloy candidate materials for the ASCB concept  

Microsoft Academic Search

An important issue for the viability of the ASCB fusion blanket concept is the compatibility of zirconium alloys with high temperature aqueous solutions containing dissolved lithium salts. Lithium hydroxide solutions and a specific Zr alloy have been selected for a first series of tests of a more general feasibility study. This paper describes some first results from electrochemical corrosion tests.

W. F. Bogaerts; M. J. Embrechts; D. Steiner; L. Deutsch; P. Gierszewski

1986-01-01

434

High-zirconium bulk metallic glasses with high strength and large ductility  

NASA Astrophysics Data System (ADS)

In this paper, high-zirconium Zr66+2 x Al9- x (Ni1/3Cu2/3)25- x ( x=0,1,2 at.%) bulk metallic glasses with high strength and large ductility were fabricated by copper mould casting. The effects of zirconium content on the glass-forming ability (GFA), thermal properties and mechanical properties were investigated using X-ray diffractometer (XRD), differential scanning calorimeter (DSC), and mechanical testing system in compressive and three-point bending modes, respectively. The high-zirconium BMGs show the critical diameters of 3-5 mm, the supercooled liquid region ranging from 70 K to 99 K, and the yield strength of over 1700 MPa. The Zr70Al7(Ni1/3Cu2/3)23 BMG exhibits a large compressive plastic strain up to 21% and a high notch toughness value of 60.6 MPa m1/2. The increase in Zr content results in the decrease in GFA and thermostability, and in the improvement of plasticity under compressive and three-point bending conditions. The superior plasticity of high-zirconium BMGs is attributed to their high Poisson's ratio and small elastic modulus ratio / B.

Yang, YaoWei; Hua, NengBin; Li, Ran; Pang, ShuJie; Zhang, Tao

2013-03-01

435

Quasi-Differential Neutron Scattering in Zirconium from 0.5 to 20 MeV  

E-print Network

Quasi-Differential Neutron Scattering in Zirconium from 0.5 to 20 MeV D. P. Barry,* G. Leinweber, R-3590 Received January 10, 2012 Accepted August 10, 2012 Abstract ­ High-energy-neutron-scattering experiments,V' r V! ~Ref. 1!. This term represents the contribution from neutrons scatter- ing from energy E

Danon, Yaron

436

Structure of zirconium alloy oxides formed in pure water studied with synchrotron radiation and  

E-print Network

Structure of zirconium alloy oxides formed in pure water studied with synchrotron radiation Abstract A detailed study was undertaken of oxides formed in 360 °C water on four Zr-based alloys (Zircaloy alloys. These results are discussed in terms of a model of oxide growth based on the periodic breakdown

Motta, Arthur T.

437

Dynamics of D2 released from the dissociation of D2O on a zirconium surface  

E-print Network

March 2006 Hydrogen is efficiently released during water dissociation on zirconium Zr , while even very the dynamics of water D2O dissociation on a crystalline Zr surface by probing the rotational and vibrational to whether water dissociates or not remain in dispute on surfaces such as Ru 0001 .2 Water interactions

Brolo, Alexandre G.

438

Zirconium tungstate hydroxide hydrate revisited: Crystallization dependence on halide and hydronium ions  

SciTech Connect

The formation of zirconium tungstate hydroxide hydrate, a precursor to the negative thermal expansion material cubic zirconium tungstate, shows a strong dependence on hydrothermal reaction conditions. It was found that not only the acid concentration, but also the acid counterion plays a significant role in the crystallization of ZrW{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O. High temperatures, high acid concentrations, and the presence of chloride or bromide ions promote the formation of well-crystallized ZrW{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O. For low acid concentrations, a new zirconium tungstate hydrate polymorph is observed, which transforms to tetragonal ZrW{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O at longer reaction times. A study of crystallization kinetics in hydrochloric acid is presented. - Graphical abstract: The formation of ZrW{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O shows a strong dependence on reaction conditions. Both acid concentration and acid counterion play a significant role in the crystallization. High temperatures, high acid concentrations, and the presence of chloride or bromide ions promote the formation of well-crystallized ZrW{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O. For low acid concentrations, a new zirconium tungstate hydrate polymorph is observed.

Colin, Julie A. [Department of Chemistry, MS 602, University of Toledo, Toledo, OH 43606 (United States)], E-mail: julie.colin@utoledo.edu; Camper, DeMarco V.; Gates, Stacy D. [Department of Chemistry, MS 602, University of Toledo, Toledo, OH 43606 (United States); Simon, Monty D. [Department of Chemistry, MS 602, University of Toledo, Toledo, OH 43606 (United States)], E-mail: monty.simon@utoledo.edu; Witker, Karen L. [Department of Chemistry, MS 602, University of Toledo, Toledo, OH 43606 (United States)], E-mail: kwitker@muskingum.edu; Lind, Cora [Department of Chemistry, MS 602, University of Toledo, Toledo, OH 43606 (United States)], E-mail: cora.lind@utoledo.edu

2007-12-15

439

Fluorescence of europium(III) in a flouride glass containing zirconium  

NASA Astrophysics Data System (ADS)

Europium(III) incorporated in a new zirconium barium flouride glass shows 14 luminescent transitions (at 300 K) from 5D J ( J= 0,1,2,3) to 7F J ( J = 0,1,2,3,4) which are compared with Judd-Ofelt parameters for induced electric dipolar radiation, as well as for calculated magnetic dipolar transition probabilities.

Reisfeld, R.; Greenberg, E.; Brown, R. N.; Drexhage, M. G.; Jrgensen, C. K.

1983-02-01

440

THE EFFECT OF HALOGENATED HYDROCARBONS ON THE BURNING OF URANIUM AND ZIRCONIUM  

Microsoft Academic Search

It was found that the addition of several percent of any of a score of ; halogenated hydrocarbons to air in which uranium or zirconium foil is burning ; will markedly lower both the burning propagation velocity and the maximum burning ; temperature. For example, the addition of 2% CHCl will lower the burning ; propagation velocity of 0.013 x

L. Leibowitz; J. G. Schnizlein; L. W. Mishler

1963-01-01

441

Possibilities of surface coating for thermal insulation. [zirconium dioxide, titanium dioxide, and zircon coatings  

NASA Technical Reports Server (NTRS)

Calculations performed for pulsating heat sources indicate a relatively thin (200-1000 micron) coating can lower temperature both inside and on the surface of a construction material. Various coating materials (including zirconium dioxide) are discussed, together with possible thermic stresses and ways to deal with the latter.

Poeschel, E.; Weisser, G.

1979-01-01

442

Solidus and liquidus temperatures in the uranium-plutonium-zirconium system  

Microsoft Academic Search

Renewed interest in metallic fuel for nuclear reactors has prompted study of the solidus and liquidus for the uranium-plutonium-zirconium system. These temperatures are of importance in assessing the possibility of fuel melting during abnormal reactor conditions. Data obtained in previous work in this area were found to be inadequate for the needs of the current reactor development effort. A dual

L. Leibowitz; E. Veleckis; R. A. Blomquist; A. D. Pelton

1987-01-01

443

Electrorefining of zirconium metal in alkali chloride and alkali fluoride fused electrolytes  

Microsoft Academic Search

The electrorefining of zirconium metal in alkali halide melts has been investigated. Variables affecting the electrodeposition process such as the composition of the electrolyte, the current density, and the configuration of the electrodes were studied. Two types of electrolytes were used: the alkali chloride-rich and the alkali fluoride-rich electrolytes. The various electrolytes are considered in terms of their ability to

S. N. Flengas; G. J. Kipouros

1985-01-01

444

CASES-97 : Diurnal variation of the fair-weather PBL.  

SciTech Connect

The CASES-97 dataset, supplemented by data from the surrounding area and from satellite, will enable us to isolate the effects of soil moisture on boundary layer evolution.Our initial approach will be to use the integrated dataset to determine (a) the factors that contribute to PBL growth, and (b) the factors that determine the wind, temperature, and wind profiles in the growing PBL. This process will help us to consolidate the dataset and tease out remaining inconsistencies. As soon as reasonable, we want to use the dataset in mesoscale numerical models, to test and refine our conclusions. Further detail on the CASES-97 field program can be found at the World Wide Web site at: http://www.mmm.ucar.edu/cases/cases.html.

Coulter, R. L.; Grossman, R. L.; Hicks, B.; Horst, T.; Klazura, G.; LeMone, M. A.; Lundquist, J. K.; McMillen, R.; Oncley, S.

1997-11-18

445

Trivalent metallocene chemistry of some uranium, titanium, and zirconium complexes  

SciTech Connect

Dicyclopentadienyluranium halide dimers have been prepared and their solution behavior examined. These molecules exist as dimers in solution, and the halide ligands undergo rapid site exchange on the NMR timescale above 50 C. Analogous dicyclopentadienyluranium hydroxide dimers have also been prepared; they oxidatively eliminate hydrogen to give the corresponding oxide dimers. Mechanism of this reaction is consistent with {alpha}migration of one of the hydroxide hydrogen atoms to a uranium center followed by elimination of hydrogen. Ground state of [(Me{sub 3}Si){sub 2}C{sub 5}H{sub 3}]{sub 3}M M = Nd, U and their base adducts has been examined by variable temperature magnetic susceptibility and EPR spectroscopy. The ground state is found to be {sup 4}I{sub 9/2} with a crystal field state consisting largely of J{sub z} = 1/2 lowest, in agreement with previous studies on tris-cyclopentadienylneodymium complexes. The zirconium metallocene Cp{sub 3}Zr has been prepared, characterized crystallographically, and its reactivity studied. Its chemical behavior is controlled by presence of an electron in the non-bonding, d{sub z}2 orbital which prevents formation of base adducts Of Cp{sub 3}Zr, but allows Cp{sub 3}Zr to abstract atoms from other molecules. Electonic and EPR spectra of Cp*{sub 2}TiX complexes, where Cp* is Me{sub 5}C{sub 5} and X is a monodentate, anionic ligand such as halide, have been studied. A {pi}-bonding spectrochemical series is developed, and trends in {pi}-bonding ability are found similar to those in other inorganic complexes. The {beta}-agostic interactions in Cp*{sub 2}TiN(Me)Ph have been examined using variable temperature EPR spectroscopy, and the enthalpy/entropy of the interaction determined. In Cp*{sub 2}TiEt, enthalpy of the {beta}-agostic interaction is {minus}1.9 kcal/mol. The titanocene anion, Cp*{sub 2}TiLi(TMEDA) (TMEDA is N,N,N`,N`-tetramethylethylenediamine), has been prepared and its structure determined.

Lukens, W.W. Jr.

1995-05-01

446

LASE measurements of convective boundary layer development during SGP97  

NASA Technical Reports Server (NTRS)

The Southern Great Plains 1997 (SGP97) field experiment was conducted in Oklahoma during June-July 1997 to validate the models used for computing remote soil moisture using measurements by microwave radiometers. One of the objectives of SGP97 was to examine the effect of soil moisture on the evolution of the Atmospheric Boundary Layer (ABL) and clouds over the Southern Great Plains (SGP) during the warm season. The LASE (Lidar Atmospheric Sensing Experiment) airborne DIAL (Differential Absorption Lidar) system, which was flown autonomously on the NASA ER-2 aircraft during previous missions, was reconfigured to fly on the NASA P3 research aircraft. During SGP97 LASE was used to study the morning evolution of the ABL, particularly as manifested in the development of the convective boundary layer, and to study the influence of soil moisture variations on the development of ABL. The ABL development is strongly influenced by the surface energy budget, which is in turn influenced by soil moisture, mesoscale meteorology, clouds, and solar insolation. LASE data acquired during this mission are being used to study the ABL water vapor budget, the development of the ABL, spatial and temporal variabilities in the ABL, and the meteorological factors that influence the ABL development. This field experiment also permitted comparisons of LASE water vapor measurements with water vapor profiles acquired by radiosondes launched at the DOE (Department of Energy) Atmospheric Radiation Measurement (ARM) Southern Great Plain (SGP) site and at NASA/Wallops Flight Facility, as well as with measurements from other SGP97 aircraft.

Ismail, Syed; Browell, Edward V.; Ferrare, Richard A.; Senff, Christoph; Davis, Kenneth J.a; Lenschow, Donald H.; Kooi, Susan; Brackett, Vince; Clayton, Marian

1998-01-01

447

97. View of International Business Machine (IBM) digital computer model ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

97. View of International Business Machine (IBM) digital computer model 7090 magnetic core installation, international telephone and telegraph (ITT) Artic Services Inc., Official photograph BMEWS site II, Clear, AK, by unknown photographer, 17 September 1965, BMEWS, clear as negative no. A-6604. - Clear Air Force Station, Ballistic Missile Early Warning System Site II, One mile west of mile marker 293.5 on Parks Highway, 5 miles southwest of Anderson, Anderson, Denali Borough, AK

448

Electroconvulsive Therapy use in a 97YearOld Woman  

Microsoft Academic Search

Objectives: The aim of this paper is to report the use of electroconvulsive therapy (ECT) to successfully treat depression in a 97-year-old woman, and to discuss the safety and efficacy of ECT in the very old.Methods: A case report and review of the literature on the use of ECT to treat depression in the very old is presented.Results: The subject

David Burke; Joanne Shannon; Alexander Beveridge

2007-01-01

449

The effect of zirconium-based surface treatment on the cathodic disbonding resistance of epoxy coated mild steel  

NASA Astrophysics Data System (ADS)

The effect of zirconium-based surface treatment on the cathodic disbonding resistance and adhesion performance of an epoxy coated mild steel substrate was investigated. The obtained data from pull-off, cathodic disbonding test and electrochemical impedance spectroscopy (EIS) indicated that the zirconium conversion layer significantly improved the adhesion strength and cathodic disbonding resistance of the epoxy coating. This may be attributed to formation of some polar zirconium compounds on the surface and increment of surface roughness, that were evident in the results of field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM), respectively.

Ghanbari, A.; Attar, M. M.

2014-10-01

450

STS-97 Astronaut Tarner Performs Extravehicular Activity (EVA)  

NASA Technical Reports Server (NTRS)

Astronaut Joseph R. Tanner, STS-97 mission specialist, is seen during a session of Extravehicular Activity (EVA), performing work on the International Space Station (ISS). Part of the Remote Manipulator System (RMS) arm and a section of the newly deployed solar array panel are in the background. The primary objective of the STS-97 mission was the delivery, assembly, and activation of the U.S. electrical power system on board the ISS. The electrical power system, which is built into a 73-meter (240-foot) long solar array structure consists of solar arrays, radiators, batteries, and electronics. The entire 15.4-metric ton (17-ton) package is called the P6 Integrated Truss Segment and is the heaviest and largest element yet delivered to the station aboard a space shuttle. The electrical system will eventually provide the power necessary for the first ISS crews to live and work in the U.S. segment. The STS-97 crew of five launched aboard the Space Shuttle Orbiter Endeavor on November 30, 2000 for an 11 day mission.

2000-01-01

451

Zirconium arsenate-modified magnetic nanoparticles: preparation, characterization and application to the enrichment of phosphopeptides.  

PubMed

Phosphorylation, one of the most important post-translational modifications of protein, plays a crucial role in a large number of biological processes. Large-scale identification of protein phosphorylation by mass spectrometry is still a challenging task because of the low abundance of phosphopeptides and sub-stoichiometry of phosphorylation. In this work, a novel strategy based on the specific affinity of zirconium arsenate to the phosphate group has been developed for the effective enrichment of phosphopeptides. Zirconium arsenate-modified magnetic nanoparticles (ZrAs-Fe(3)O(4)@SiO(2)) were prepared by covalent immobilization of zirconium arsenate on Fe(3)O(4)@SiO(2) magnetic nanoparticles under mild conditions, and characterized by transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectroscopy, energy dispersive X-ray spectroscopy (EDX) and vibrating sample magnetometer (VSM). The prepared ZrAs-Fe(3)O(4)@SiO(2) was applied for the selective enrichment of phosphopeptides from the digestion mixture of phosphoproteins and bovine serum albumin (BSA). Our results demonstrated that the ZrAs-Fe(3)O(4)@SiO(2) magnetic nanoparticles possess higher selectivity for phosphopeptides and better capture capability towards multiply-phosphorylated peptides than commercial zirconium dioxide (ZrO(2)), which has been widely employed for the enrichment of phosphopeptides. In addition, endogenous phosphopeptides from human serum can be effectively captured by ZrAs-Fe(3)O(4)@SiO(2) magnetic nanoparticles. It is the first report, to the best of our knowledge, in which the zirconium arsenate-modified magnetic nanoparticles were successfully applied to the enrichment of phosphopeptides, which offers the potential application of this new material in phosphoproteomics study. PMID:22182930

Li, Xiao-Shui; Xu, Li-Dan; Zhu, Gang-Tian; Yuan, Bi-Feng; Feng, Yu-Qi

2012-02-21

452

The effect of sulfur and zirconium co-doping on the oxidation of NiCrAl  

NASA Technical Reports Server (NTRS)

The adhesion behavior of Al2O3 scales formed on NiCrAl+Zr alloys was examined as a function of both sulfur and zirconium doping levels. In general, very high levels of zirconium were required to counteract the detrimental effects of sulfur. A sulfur-zirconium adherence map was constructed, as determined from the oxidation and spalling behavior in 1100 C cyclic tests. For low sulfur alloys (less than 500 ppma), the amount of zirconium required for adherence at any given sulfur level can be described by Zr greater than 600 S(0.2) (in ppma). These results underscore the importance of sulfur to adhesion mechanisms and suggest that sulfur gettering is a first order effect of reactive element additions to MCrAl alloys.

Smialek, James L.

1988-01-01

453

The effect of sulfur and zirconium Co-doping on the oxidation of NiCrAl  

NASA Technical Reports Server (NTRS)

The adhesion behavior of Al2O3 scales formed on NiCrAl+Zr alloys was examined as a function of both sulfur and zirconium doping levels. In general, very high levels of zirconium were required to counteract the detrimental effects of sulfur. A sulfur-zirconium adherence map was constructed, as determined from the oxidation and spalling behavior in 1100 C cyclic tests. For low sulfur alloys, the amount of zirconium required for adherence at any given sulfur level can be described by Zr greater than 600 S sup 0.2 (in ppma). These results underscore the importance of sulfur to adhesion mechanisms and suggests that sulfur gettering is a first order effect of reactive element additions to MCrAl alloys.

Smialek, James L.

1987-01-01

454

Synthesis and structural characterisation using Rietveld and pair distribution function analysis of layered mixed titanium-zirconium phosphates  

NASA Astrophysics Data System (ADS)

Crystalline metal (IV) phosphates with variable zirconium-to-titanium molar ratios of general formula (Ti 1- xZr x)(HPO 4) 2H 2O have been prepared by precipitation of soluble salts of the metals with phosphoric acid and heating the amorphous solids in 12 M H 3PO 4 in an autoclave. The new materials are structurally characterised by Rietveld analysis of synchrotron X-ray powder diffraction data and pair distribution function (PDF) analysis of high energy synchrotron X-ray total scattering data. A broad range of zirconium-titanium phosphate solid solutions were formed showing isomorphous substitution of titanium by zirconium in the ?-titanium phosphate lattice and vice versa for titanium substitution into the ?-zirconium phosphate lattice. In both cases the solubility is partial with the coexistence of two substituted phases observed in samples with nominal compositions between the solubility limits.

Burnell, Victoria A.; Readman, Jennifer E.; Tang, Chiu C.; Parker, Julia E.; Thompson, Stephen P.; Hriljac, Joseph A.

2010-09-01

455

Thermal analysis of uranium zirconium hydride fuel using a lead-bismuth gap at LWR operating temperatures  

E-print Network

Next generation nuclear technology calls for more advanced fuels to maximize the effectiveness of new designs. A fuel currently being studied for use in advanced light water reactors (LWRs) is uranium zirconium hydride ...

Ensor, Brendan M. (Brendan Melvin)

2012-01-01

456

Effect of the flame temperature on the characteristics of zirconium oxide fine particle synthesized by flame assisted spray pyrolysis  

NASA Astrophysics Data System (ADS)

Zirconium oxide fine particles were synthesized by flame assisted spray pyrolysis using zirconium chloride solution as precursor. Propane gas and air were used as a fuel and an oxidizer, respectively. The ratio of flow rate of oxidizer and fuel was maintained constant at 10:1 to ensure a complete combustion. Increasing fuel flow rate led to the increase of temperature distribution in the flame reactor. The intensity of XRD patterns increased with temperature and precursor concentration. Phase composition of zirconium oxide produced by this process consisted of monoclinic and tetragonal phases. The volume fraction of monoclinic phase of zirconium oxide increased with temperature and precursor concentration. The morphology particles observed by SEM resulted in spherical particles with size in the submicron range depending on the precursor concentration.

Widiyastuti, W.; Machmudah, Siti; Nurtono, Tantular; Winardi, Sugeng

2013-09-01

457

J. Chem. Soc., Dalton Trans., 1997, Pages 30873096 3087 Preparation of new zirconium benzamidinates: alkyl derivatives and  

E-print Network

DALTON J. Chem. Soc., Dalton Trans., 1997, Pages 3087­3096 3087 Preparation of new zirconium and ethylene John R. Hagadorn and John Arnold*, Department of Chemistry, University of California, Berkeley

Hagadorn, John R.

458

Structural studies of calcium phosphate doped with titanium and zirconium obtained by high-energy mechanical alloying  

Microsoft Academic Search

In this paper, we present a new variation of the solid-state procedure on the synthesis of bioceramics with titanium (CapTi) and zirconium (CapZr), considering that zirconium (ZrO2) and titanium oxide (TiO2) are strengthening agents, due to their superb force and fracture toughness. The high efficiency of the calcination process opens a new way of producing commercial amounts of nanocrystalline bioceramics.

C. C. Silva; A. S. B. Sombra

2009-01-01

459

Synthesis and PhysicoChemical Properties of Zirconium Phosphoborate and its Application in The Quantitative Separation of Lanthanides  

Microsoft Academic Search

A new inorganic ion exchanger, zirconium phosphoborate (Zr:P:B = 1:1:1), has been synthesized by mixing a 0.1M zirconium oxychloride solution with a hot mixture of 0.1M boric acid and 0.1M phosphoric acid solutions in the ratio 2:1:1. The pH of the mixture was adjusted to zero. This procedure gave a reproducible ion exchanger. It is fairly stable in water, dilute

P. S. Thind; S. K. Mittal; Sunita Gujral

1988-01-01

460

Chemical behaviour of zirconium oxychloride octahydrate and acetic acid in precursor solution for zirconia film formation on glass  

Microsoft Academic Search

Precursor solutions for zirconia films on soda lime silica glass substrate were prepared from zirconium oxychloride octahydrate\\u000a (ZOO) and acetic acid (HOAC) maintaining the mol ratios, [HOAC]\\/[ZOO]=2, 4, 6, 8 and 10. A characteristic UV absorption band\\u000a at ?280 nm in the ?120h aged precursor solutions was identified for acetate group of the zirconium acetato complexed species.\\u000a The presence of

Sunirmal Jana; Prasanta K. Biswas

1997-01-01

461

97 Ru-transferrin uptake in tumor and abscess  

Microsoft Academic Search

The uptake of97Ru-transferrin (Ru-TF) in tumor and abscess bearing animals was compared with67Ga-citrate (Ga),123I-transferrin (I-TF), and several other plasma proteins. Maximal concentration in tumor of Ru-TF in mice was three times higher than67Ga-citrate (16.804.20 vs 5.080.58% D\\/g) although it occurred later (24 h compared with67Ga which reached its maximum 2 h after injection). Whole body autoradiography (WBARG) with103Ru-transferrin (103Ru-TF) in

P. Som; Z. H. Oster; K. Matsui; G. Guglielmi; B. R. R. Persson; M. L. Pellettieri; S. C. Srivastava; P. Richards; H. L. Atkins; A. B. Brill

1983-01-01

462

IPEDS: Faculty Salaries 1996-97 Release 2  

NSDL National Science Digital Library

This site hosts the US Department of Education's National Center for Education Statistics (NCES) preliminary data file for the survey "Salaries, Tenure, and Fringe Benefits of Full-Time Instructional Faculty" for academic year 1996-97, part of the 1995 Integrated Postsecondary Education Data System (IPEDS). "The file includes the following data by institution: number of full-time instructional faculty, total salary outlays, and number of tenured faculty, by contract length (9- or 12-month), sex, and academic rank. The file also includes fringe benefit expenditures and number of faculty covered, by length of contract and type of benefit." The data are available in compressed .zip format.

Statistics., National C.

1998-01-01

463

Protection of zirconium by alumina- and chromia-forming iron alloys under high-temperature steam exposure  

NASA Astrophysics Data System (ADS)

The viability of advanced oxidation-resistant Fe-base alloys to protect zirconium from rapid oxidation in high-temperature steam environments has been examined. Specimens were produced such that outer layers of FeCrAl ferritic alloy and Type 310 austenitic stainless steel were incorporated on the surface of zirconium metal slugs. The specimens were exposed to high-temperature 0.34 MPa steam at 1200 and 1300 C. The primary degradation mechanism for the protective layer was interdiffusion with the zirconium, as opposed to high-temperature oxidation in steam. The FeCrAl layer experienced less degradation and protected the zirconium at 1300 C for 8 h. Constituents of the Fe-base alloys rapidly diffused into the zirconium and resulted in the formation of various intermetallic layers at the interface and precipitates inside the bulk zirconium. The nature of this interaction for FeCrAl and 310SS has been characterized by use of microscopic techniques as well as computational thermodynamics. Finally, a reactor physics discussion on the applicability of these protective layers in light-water-reactor nuclear fuel structures is offered.

Terrani, Kurt A.; Parish, Chad M.; Shin, Dongwon; Pint, Bruce A.

2013-07-01

464

Influence of zirconium doping on the activities of zirconium and iodine co-doped titanium dioxide in the decolorization of methyl orange under visible light irradiation  

NASA Astrophysics Data System (ADS)

Zirconium and iodine co-doped titanium dioxide (Zr-I-TiO 2) was prepared by the hydrolysis of tetrabutyl titanate, premixed with zirconium nitrate in an iodic acid aqueous solution, followed by calcination in air. The structure and properties of the resultant catalyst powders were characterized by X-ray diffraction, the Brunauer-Emmett-Teller method, X-ray photoelectron spectroscopy, transmission electron microscopy, and UV-vis absorption spectroscopy. The catalytic activity of the catalyst was evaluated by monitoring the photocatalytic decolorization of methyl orange under visible light irradiation. The results showed that the activities of Zr-I-TiO 2 catalysts were higher than that of TiO 2 doped with iodine alone (I-TiO 2), and the optimal doping concentration in the Zr-I-TiO 2 calcined at 400 C was determined to be about 0.05 (molar ratio of Zr:Ti). In addition, the photocatalytic activity of Zr-I-TiO 2 calcined at 400 C was found to be significantly higher than that calcined at 500 or 600 C. Based on the physico-chemical characterization, we concluded that the role of zirconium on the I-TiO 2 surface is to increase the number of reactive sites by generating a small crystal size and large surface area. The inhibition of electron-hole pair recombination, by trapping photo-generated electrons with Zr 4+, did not contribute markedly to the improved photocatalytic activity of Zr-I-TiO 2.

Song, Shuang; Hong, Fangyue; He, Zhiqiao; Wang, Hongyu; Xu, Xianghong; Chen, Jianmeng

2011-09-01

465

27 CFR 19.97 - Taxpaid spirits or wines on bonded premises.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Taxpaid spirits or wines on bonded premises. 19.97 Section...Miscellaneous Provisions Conveyance of Spirits Or Wines on Plant Premises 19.97 Taxpaid spirits or wines on bonded premises. Spirits or...

2010-04-01

466

40 CFR 152.97 - Rights and obligations of data submitters.  

Code of Federal Regulations, 2011 CFR

...2011-07-01 false Rights and obligations of data submitters. 152.97 Section 152...PROCEDURES Procedures To Ensure Protection of Data Submitters' Rights 152.97 Rights and obligations of data submitters. (a) Right to be...

2011-07-01

467

40 CFR 152.97 - Rights and obligations of data submitters.  

Code of Federal Regulations, 2013 CFR

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2013-07-01

468

40 CFR 152.97 - Rights and obligations of data submitters.  

Code of Federal Regulations, 2012 CFR

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2012-07-01

469

40 CFR 97.341 - Timing requirements for CAIR NOX Ozone Season allowance allocations.  

Code of Federal Regulations, 2011 CFR

...false Timing requirements for CAIR NOX Ozone Season allowance allocations. 97.341...NOX AND SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Allocations 97.341 Timing requirements for CAIR NOX Ozone Season allowance allocations....

2011-07-01

470

40 CFR 97.310 - Authorization and responsibilities of CAIR designated representative.  

Code of Federal Regulations, 2011 CFR

... CAIR Designated Representative for CAIR NOX Ozone Season Sources 97.310 Authorization...provided under 97.311, each CAIR NOX Ozone Season source, including all CAIR NOX Ozone Season units at the source, shall have...

2011-07-01

471

40 CFR 97.310 - Authorization and responsibilities of CAIR designated representative.  

Code of Federal Regulations, 2010 CFR

... CAIR Designated Representative for CAIR NOX Ozone Season Sources 97.310 Authorization...provided under 97.311, each CAIR NOX Ozone Season source, including all CAIR NOX Ozone Season units at the source, shall have...

2010-07-01

472

40 CFR 97.342 - CAIR NOX Ozone Season allowance allocations.  

Code of Federal Regulations, 2011 CFR

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2011-07-01

473

40 CFR 97.360 - Submission of CAIR NOX Ozone Season allowance transfers.  

Code of Federal Regulations, 2011 CFR

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2011-07-01

474

40 CFR 97.360 - Submission of CAIR NOX Ozone Season allowance transfers.  

Code of Federal Regulations, 2010 CFR

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2010-07-01

475

40 CFR 97.353 - Recordation of CAIR NOX Ozone Season allowance allocations.  

Code of Federal Regulations, 2011 CFR

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2011-07-01

476

40 CFR 97.342 - CAIR NOX Ozone Season allowance allocations.  

Code of Federal Regulations, 2010 CFR

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2010-07-01

477

40 CFR 97.353 - Recordation of CAIR NOX Ozone Season allowance allocations.  

Code of Federal Regulations, 2010 CFR

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2010-07-01

478

40 CFR 97.341 - Timing requirements for CAIR NOX Ozone Season allowance allocations.  

Code of Federal Regulations, 2010 CFR

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2010-07-01

479

7 CFR 27.97 - Ascertaining the accuracy of price quotations.  

Code of Federal Regulations, 2010 CFR

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2010-01-01

480

7 CFR 27.97 - Ascertaining the accuracy of price quotations.  

Code of Federal Regulations, 2011 CFR

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2011-01-01

481

10 CFR 71.97 - Advance notification of shipment of irradiated reactor fuel and nuclear waste.  

Code of Federal Regulations, 2011 CFR

...of irradiated reactor fuel and nuclear waste. 71.97 Section 71.97...of irradiated reactor fuel and nuclear waste. (a) As specified...notification of transportation of nuclear waste was published in the Federal...

2011-01-01

482

46 CFR 97.30-1 - Repairs to boilers and pressure vessels.  

Code of Federal Regulations, 2013 CFR

... 2013-10-01 false Repairs to boilers and pressure vessels. 97.30-1...Equipment 97.30-1 Repairs to boilers and pressure vessels. (a) Before making any repairs to boilers or unfired pressure vessels, the...

2013-10-01

483

46 CFR 97.30-1 - Repairs to boilers and pressure vessels.  

Code of Federal Regulations, 2011 CFR

... 2011-10-01 false Repairs to boilers and pressure vessels. 97.30-1...Equipment 97.30-1 Repairs to boilers and pressure vessels. (a) Before making any repairs to boilers or unfired pressure vessels, the...

2011-10-01

484

46 CFR 97.30-1 - Repairs to boilers and pressure vessels.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 false Repairs to boilers and pressure vessels. 97.30-1...Equipment 97.30-1 Repairs to boilers and pressure vessels. (a) Before making any repairs to boilers or unfired pressure vessels, the...

2010-10-01

485

46 CFR 97.30-1 - Repairs to boilers and pressure vessels.  

Code of Federal Regulations, 2012 CFR

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2012-10-01

486

Science and Engineering Degrees, by Race/Ethnicity of Recipients: 1989-97  

NSF Publications Database

Science and Engineering Degrees, by Race/Ethnicity of Recipients: 1989-97 Detailed Statistical ... Science and Engineering Degrees, by Race/Ethnicity of Recipients: 1989-97 Portable Document Format ...

487

46 CFR 56.97-35 - Pneumatic tests (replaces 137.5).  

Code of Federal Regulations, 2013 CFR

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2013-10-01

488

40 CFR 81.97 - Southwest Florida Intrastate Air Quality Control Region.  

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2014-07-01

489

46 CFR 111.97-5 - Electric and hydraulic power supply.  

Code of Federal Regulations, 2010 CFR

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2010-10-01

490

40 CFR 86.612-97 - Suspension and revocation of certificates of conformity.  

Code of Federal Regulations, 2010 CFR

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2010-07-01

491

47 CFR 97.27 - FCC modification of station license grant.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 2010-10-01 false FCC modification of station license grant. 97...SERVICE General Provisions 97.27 FCC modification of station license grant. (a) The FCC may modify a station license grant,...

2010-10-01

492

40 CFR 97.386 - Withdrawal from CAIR NOX Ozone Season Trading Program.  

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2014-07-01

493

40 CFR 97.310 - Authorization and responsibilities of CAIR designated representative.  

Code of Federal Regulations, 2013 CFR

...Designated Representative for CAIR NOX Ozone Season Sources 97.310 Authorization and responsibilities...provided under 97.311, each CAIR NOX Ozone Season source, including all CAIR NOX Ozone Season units at the source, shall have one...

2013-07-01

494

40 CFR 97.360 - Submission of CAIR NOX Ozone Season allowance transfers.  

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2014-07-01

495

40 CFR 97.524 - Compliance with TR NOX Ozone Season emissions limitation.  

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2014-07-01

496

40 CFR 97.511 - Timing requirements for TR NOX Ozone Season allowance allocations.  

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2014-07-01

497

40 CFR 97.310 - Authorization and responsibilities of CAIR designated representative.  

...Designated Representative for CAIR NOX Ozone Season Sources 97.310 Authorization and responsibilities...provided under 97.311, each CAIR NOX Ozone Season source, including all CAIR NOX Ozone Season units at the source, shall have one...

2014-07-01

498

40 CFR 97.341 - Timing requirements for CAIR NOX Ozone Season allowance allocations.  

...Timing requirements for CAIR NOX Ozone Season allowance allocations. 97.341 Section...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Allocations 97.341 Timing requirements for CAIR NOX Ozone Season allowance allocations. (a) The...

2014-07-01

499

40 CFR 97.353 - Recordation of CAIR NOX Ozone Season allowance allocations.  

...true Recordation of CAIR NOX Ozone Season allowance allocations. 97.353...SO2 TRADING PROGRAMS CAIR NOX Ozone Season Allowance Tracking System 97.353 Recordation of CAIR NOX Ozone Season allowance allocations. (a)...

2014-07-01

500

40 CFR 97.310 - Authorization and responsibilities of CAIR designated representative.  

Code of Federal Regulations, 2012 CFR

...Designated Representative for CAIR NOX Ozone Season Sources 97.310 Authorization and responsibilities...provided under 97.311, each CAIR NOX Ozone Season source, including all CAIR NOX Ozone Season units at the source, shall have one...

2012-07-01