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1

The importance of phase in speech enhancement Kuldip Paliwal, Kamil Wojcicki  

E-Print Network [OSTI]

The importance of phase in speech enhancement Kuldip Paliwal, Kamil Wo´jcicki , Benjamin Shannon 1 Available online 24 December 2010 Abstract Typical speech enhancement methods, based on the short in the enhancement process the quality of the resulting speech can be improved. For this we use analysis windows

2

Gwen N Hooten  

Office of Legacy Management (LM)

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

3

Translating FSP into LOTOS and Networks of Gwen Salaun1  

E-Print Network [OSTI]

. Fsp is a widely-used calculus equipped with Ltsa, a graphical and user-friendly tool. Lotos accepted by Cadp. Hence, it is possible to use jointly Ltsa and Cadp to validate Fsp specifications. Our conceived to make the writing of specifications easier and concise. Fsp is supported by Ltsa, a user

Joseph Fourier Grenoble-I, Université

4

Analytical Alias Resolution Mehmet Hadi Gunes and Kamil Sarac  

E-Print Network [OSTI]

that · includes artificial links/nodes · misses existing links/nodes Alias Resolution: Problem IPA2 IPA3 IPA4 IPA5IPA6 IPA1 #12;Analytical Alias Resolution 5/13 Address Based Method (Mercator and iffinder) [J.Pansiot98] · Send probe packets to different IP addresses (i.e. IPA and IPB) · If replies from have the same

Gunes, Mehmet Hadi

5

AK01: Unified Copies kamil@cs.berkeley.edu  

E-Print Network [OSTI]

Copies 2.1 Uncopies An uncopy presumably would copy zero items from the source to destination, perhaps uncopies. 2.2 Simple Copies Simple copies copy the data item at the source and forward

California at Berkeley, University of

6

Data Acquisition-Manipulation At Chena Area (Erkan, Et. Al., 2008) | Open  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address:011-DNA Jump to: navigation, searchIllinois: Energy Resources(Blackwell, Et Al., 2003)

7

Thermal Gradient Holes At Chena Area (Erkan, Et. Al., 2008) | Open Energy  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revisionEnvReviewNonInvasiveExplorationUT-gTaguspark JumpDetective Jump to:the NatureOpenOpenAlum Area (DOE2004)

8

Aeromagnetic Survey At Chena Area (Erkan, Et. Al., 2008) | Open Energy  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectric Coop,SaveWhiskeyEnergyAd-VentaAddison isInformation Lazaro,|

9

Audio-Magnetotellurics At Chena Area (Erkan, Et. Al., 2008) | Open Energy  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectricEnergyCT BiomassArnprior, Ontario: EnergyAskjaAtlasAubrey,1978) |

10

Isotopic Analysis- Fluid At Chena Area (Erkan, Et. Al., 2008) | Open Energy  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to:46 - 429 Throttled (botOpen Energy InformationInformationInformation

11

Airborne Electromagnetic Survey At Chena Area (Erkan, Et. Al., 2008) | Open  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160 East 300 SouthWaterBrasil JumpAerowatt

12

Static Temperature Survey At Chena Area (Erkan, Et. Al., 2008) | Open  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty Ltd JumpGTZHolland,0162112°,St.StanlyEnergy Information Area (Benoit,

13

Thermal Gradient Holes At Chena Geothermal Area (Erkan, Et Al., 2007) |  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty LtdSteen,Ltd Jump Jump to:InformationTheInformationAl., 1993) |Open

14

Modulation Domain Spectral Subtraction for Speech Enhancement Kuldip Paliwal, Belinda Schwerin, Kamil Wojcicki  

E-Print Network [OSTI]

Modulation Domain Spectral Subtraction for Speech Enhancement Kuldip Paliwal, Belinda Schwerin- native to the acoustic domain for speech enhancement. More specifically, we wish to determine how achieves better back- ground noise reduction than the MMSE method. Index Terms: speech enhancement

15

Power Efficiency and the Top500 John Shalf, Shoaib Kamil, Erich Strohmaier, David Bailey  

E-Print Network [OSTI]

Berkeley National Laboratory (LBNL) National Energy Research Supercomputing Center (NERSC) Top500 Birds are well-mined ­ Cannot expect exotic architectures to save us from the "power wall" ­ Even resources and growing up to 15MW/year ­ Not enough power left for city of Baltimore! · LBNL IJHPCA Study for ~1

16

WBU-14-0013 - In the Matter of Kamil Gierszal | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up from theDepartment of Dept.| DepartmentVolvo Trucks Manufacturing4-0006 - In the2 -93

17

Multiplexed Echo Planar Imaging for Sub-Second Whole Brain FMRI and Fast Diffusion Imaging  

E-Print Network [OSTI]

, Karla L. Miller5 , Kamil Ugurbil4 , Essa Yacoub4 1 Advanced MRI Technologies, Sebastopol, California

Reber, Paul J.

18

Application of burnable absorbers in an accelerator driven system Jan Wallenius, Kamil Tucek, Johan Carlsson, Waclaw Gudowski  

E-Print Network [OSTI]

Carlsson, Waclaw Gudowski Department of Nuclear & Reactor Physics Royal Institute of Technology 100 44 to achieve smallest possible power peakings at a BOL sub-criticality level of 0.97. Detailed Monte Carlo to corresponding values in BA free cores, BA introduction diminishes reactivity losses in TRU fuelled sub-critical

19

k-Selection Protocols from Energetic Complexity Perspective Marcin Kardas, Marek Klonowski, Dominik Paj ak, Kamil Wolny  

E-Print Network [OSTI]

of the system is determined by the most loaded station, which motivated us to consider maximal energy usage effort over all stations. The energy usage of a particular station is the number of rounds when goal is to investigate relations between minimal time of execution (time complexity) and energy

Paris-Sud XI, Université de

20

The Impact of the Item Types and Number of Solution Steps of Multiple-Choice Items on Item Difficulty and Discrimination and Test Reliability  

E-Print Network [OSTI]

The Impact of the Item Types and Number of Solution Steps of Multiple-Choice Items on Item Difficulty and Discrimination and Test Reliability By Erkan Hasan Atalmis Submitted to the graduate degree program in the Department of Psychology... ________________________________ Bruce Frey ________________________________ Marianne Perie ________________________________ Argun Saatcioglu ________________________________ William Skorupski Date Defended: 5/5/14 The Dissertation Committee for Erkan Hasan...

Atalmis, Erkan Hasan

2014-08-31T23:59:59.000Z

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


21

E-Print Network 3.0 - aleksandr hlebnikov andres Sample Search...  

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

Summary: . Technical Report CE-P08-001, Princeton University, 2008. 5 Luiz Andre Barroso, Kourosh Gharachorloo... Gilbert Hendry, Shoaib Kamil, Aleksandr Biberman, Johnnie...

22

Acknowledgments The National Reading Panel wishes to express its gratitude to the following individuals for their contributions  

E-Print Network [OSTI]

.D. Linnea Ehri, Ph.D. Gwenette Ferguson, M.Ed. Norma Garza, C.P.A. Michael L. Kamil, Ph.D. Cora Bagley.D. Joanna Williams, Ph.D. Dale Willows, Ph.D. Joanne Yatvin, Ph.D. MEMBERS OF THE NATIONAL READING PANEL Comprehension Michael L. Kamil, Chair Gwenette Ferguson Norma Garza Thomas Trabasso JoannaWilliams Fluency S

Rau, Don C.

23

Kindergarten Family Reading Institute: Empowering Parents Through a Sustained Home and School Partnership  

E-Print Network [OSTI]

S. , & Shaywitz, B. (1999). Dyslexia. In K. Swaiman and S.learners and students with dyslexia. In S. J. Samuels & A.reading disability (dyslexia). In M. Kamil, P. Mosenthal, P.

Ulloa, Carlos

2013-01-01T23:59:59.000Z

24

www.strath.ac.uk THIS IS YOUR  

E-Print Network [OSTI]

Building Lorna Bennet SBS Exchange Co-ordinator Michele French SBS Exchange Secretary 01 | Contents 03 Building erkan.oterkus@strath.ac.uk Lorna Bennet Strathclyde Business School Level 2, Sir William Duncan Building lorna.bennet@strath.ac.uk www.strath.ac.uk | 06 #12;Key Dates www

Mottram, Nigel

25

Modeling of the interactions between forest vegetation, disturbances, and sediment yields  

E-Print Network [OSTI]

Modeling of the interactions between forest vegetation, disturbances, and sediment yields Erkan on the frequency and magnitude of sediment delivery from a small watershed ($3.9 km2 ) in the Idaho batholith weathering and the divergence of diffusive sediment transport on hillslopes. Soil removal is due to episodic

Tarboton, David

26

An overview of global gold market and gold price forecasting Shahriar Shafiee a,n  

E-Print Network [OSTI]

into the relationship between gold price and other key influencing variables, such as oil price and global inflationAn overview of global gold market and gold price forecasting Shahriar Shafiee a,n , Erkan Topal b history: Received 6 February 2009 Received in revised form 20 April 2010 Accepted 17 May 2010 Jel

Boisvert, Jeff

27

Identifying the Volcanic Eruption Depicted in a Neolithic Painting at Catalhoyuk, Central Anatolia, Turkey  

E-Print Network [OSTI]

Anatolia, Turkey Axel K. Schmitt1 *, Martin Danisi´k2 , Erkan Aydar3 , Erdal S¸en4 , Inan Ulusoy4 , Oscar M Zealand, 3 ATERRA R&D, Yuksel Cad. 30/8, Kizilay, Ankara, Turkey, 4 Department of Geological Engineering, Hacettepe University, Beytepe, Ankara, Turkey Abstract A mural excavated at the Neolithic C¸atalho¨yu¨k site

Harrison, Mark

28

SIGNIFICANT PLANT, ANIMAL, AND WETLAND RESOURCES OF LARIMER COUNTY  

E-Print Network [OSTI]

; Dr. David Armstrong and the University of Colorado Museum; Dr. Paul Opler and Dr. Boris Kondratieff to this project including Gwen Kittel, Lea Spears, Phyllis Pineda, Alex Birchfield, Liz Phillips, Scott Schneider

29

Breaking Outside the Walls: Teachers of Gifted and Talented African American Males in a Texas Urban Middle School  

E-Print Network [OSTI]

in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Chair of Committee, Norvella Carter Committee Members, Gwen Webb-Hasan Larry Kelly Terah Venzant-Chambers Head of Department, Yeping Li August 2013 Major...

Henderson, Sowanda Nimmer

2013-08-07T23:59:59.000Z

30

DECISION AND ORDER OF THE DEPARTMENT OF ENERGY Initial Agency...  

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

coordinator, Greg Kirsch, a safety engineer with the Safety Engineering Group, Gwen Germany, an analyst in the EEO department, Ann Jensen, an industrial hygienist with the ES&H...

31

I Am a Chameleon In Pearls: How Three Select Female Superintendents Perceive Their Professional Lives  

E-Print Network [OSTI]

Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF EDUCATION Approved by: Co-Chairs of Committee, Gwen Webb-Hasan Virginia Collier Committee Members, Linda Skrla Norvella Carter Head....S., University of Mary Hardin-Baylor; M.S. Tarleton State University Co-Chairs of Advisory Committee: Dr. Gwen Webb-Hasan Dr. Virginia Collier The public school superintendent is the least progressive position in education at integrating women...

Ryan, Catherine

2012-10-19T23:59:59.000Z

32

KALMAN FILTER WITH PHASE SPECTRUM COMPENSATION ALGORITHM FOR SPEECH ENHANCEMENT  

E-Print Network [OSTI]

KALMAN FILTER WITH PHASE SPECTRUM COMPENSATION ALGORITHM FOR SPEECH ENHANCEMENT Stephen So, Kamil K with a recent speech enhancement technique, called the phase spectrum compen- sation procedure, or PSC. More-- Kalman filter, phase spectrum compensation (PSC), speech enhancement 1. INTRODUCTION The Kalman filter

33

IEEE SIGNAL PROCESSING LETTERS, VOL. 15, 2008 461 Exploiting Conjugate Symmetry of the Short-Time  

E-Print Network [OSTI]

-Time Fourier Spectrum for Speech Enhancement Kamil Wójcicki, Mitar Milacic, Anthony Stark, James Lyons, and Kuldip Paliwal, Member, IEEE Abstract--Typical speech enhancement algorithms operate on the short, speech en- hancement. I. INTRODUCTION IN the field of speech enhancement, we are interested

34

Governance & Management Model April 11, 2010  

E-Print Network [OSTI]

Production Control Gwen Campus Community Workflow Address Validation HR Reporting HR Security Design PositionSoft HR, Payroll, and Finance systems, using common solutions to the fullest extent possible in both; Transparency & Sharing Create an environment that supports the sharing of knowledge, processes, methods

35

CORNELL'S QUARTERLY MAGAZINE SPRING 2014 4 -What we talk about when we talk about diversity 14 -Successes in chemistry 16 -Moving in at Gates Hall 28 -Coming out, getting together  

E-Print Network [OSTI]

Perez Beduya, Shannon Dortch, Corey Ryan Earle, Linda B. Glaser, Gwen Glazer, Emily Sanders Hopkins CONTENTS 4 16 31 DivisionofRareandManuscriptCollections #12;Q&A WITH CORNELL'S DEANS Glenn Altschuler, Dan HOPKINS HISTORY Impromptu holiday: Cornell's springtime celebrations BY COREY RYAN EARLE `WE CORNELLIANS

Chen, Tsuhan

36

Information Technology @ MSU Through the eyes of the users!  

E-Print Network [OSTI]

Information Technology @ MSU Through the eyes of the users! Dewitt Latimer, Ph.D. Chief Information.edu/itcenter/CTOsearch #12;MSU Enterprise Chief Information Officer Dewitt Latimer User Support Services Computing Center Director Gwen Jacobs (Independent Center under CIO) Finance & Accounting

Maxwell, Bruce D.

37

Information Technology @ MSU Through the eyes of the users!  

E-Print Network [OSTI]

1 Information Technology @ MSU Through the eyes of the users! Dewitt Latimer, Ph.D. Chief to start work in February 2013 #12;8 MSU Enterprise Chief Information Officer Dewitt Latimer User Support Center Director Gwen Jacobs MSU President Waded Cruzado MSU Provost Martha Potvin 4 Campus IT Governance

Maxwell, Bruce D.

38

Josephine Ford Cancer Center Cancer Research Programs  

E-Print Network [OSTI]

Josephine Ford Cancer Center Cancer Research Programs presented to WSU SOM PAD January 10, 2012 presented by Sandra A. Rempel, Ph.D. Associate Director of Research, JFCC #12;JFCC Cancer Research Programs Cancer Epidemiology, Prevention and Control Program Members: Gwen Alexander, Andrea Cassidy

Berdichevsky, Victor

39

Conference Registrants *As of September 10, 2014  

E-Print Network [OSTI]

· Mary Ibukun Adeogun '13 · N. L. Akili Buchanan '76 · Karen S. Ali '78 · C. Kamil Ali-Jackson '81 S79 P18 · Nerissa E.A. Alleyne '01 · Aku Ammah-Tagoe '11 · Brigitte R. Anderson '02 · Justin C. Anderson · Keiyana B. Fordham '04 · Gwendolyn Steele Fortson Waring '77 · Marie B. Francois '03 · Jamil O. French '97

Singh, Jaswinder Pal

40

PROCESSO SELETIVO DO MESTRADO 2013 PIPE CRONOGRAMA ESPECIAL DE ENTREVISTAS  

E-Print Network [OSTI]

Carlos Barumby 15:30h João Luiz Zottis 15:45h Júlio César Zaupa 16:00h Kamile Fuchs 16:15h Kassiana Roberto de Sousa 13:45h Bruno Leandro Pereira 14:00h Diego de Oliveira Corrêa 14:15h Deivid Wagner Borba DE OUTRAS LOCALIDADES Alexandre Pigozzo Manso Andre Luis Lima Flores Jorge Luiz Micheletti Goessler

Paraná, Universidade Federal do

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


41

Perceptions of Five Middle School Science Teachers: A Suburban Success Story on the Texas Assessment of Knowledge and Skills Achievement for Eighth Grade African American Students  

E-Print Network [OSTI]

&M University in partial fulfillment of the requirements for the degree of DOCTOR OF EDUCATION Approved by: Chair of Committee, Gwendolyn Webb-Hasan Committee Members, Virginia Collier Patricia Larke Jim Scheurich Head of Department, Fredrick... Students. (May 2011) Cheryl Turner Henry, B.A., The University of California at Los Angeles; M.A., Stanford University Chair of Advisory Committee: Dr. Gwen Webb-Hasan The purpose of this qualitative study was to examine a problem of practice present...

Henry, Cheryl Turner

2012-07-16T23:59:59.000Z

42

Recruiting African American Male Teachers in K-12 Schools: A Case Study in One Urban School District  

E-Print Network [OSTI]

, Gwen Webb-Hasan Terah Chambers Head of Department, Dennie L. Smith December 2011 Major Subject: Curriculum and Instruction iii ABSTRACT Recruiting African American Male Teachers in K-12 Schools: A... to thank my brother for his constant words of encouragement and lending ears. I thank my committee co-chairs, Dr. Lewis and Dr. Carter, and my committee members, Dr. Web-Hasan and Dr. Venzant-Chambers, for their guidance and support throughout...

Watson, Jesse

2012-02-14T23:59:59.000Z

43

Cornell's quarterly magazine spring 2012 CornellnYC tech launches  

E-Print Network [OSTI]

of Dan Huttenlocher, vice provost and founding dean of the CornellNYC Tech campus. Photo by Robert Barker: Daniel Aloi, Jose Perez Beduya, Evan Drexler, Corey Ryan Earle, Gwen Glazer, Emily Sanders Hopkins, Anne lives on By CorEy ryAN EArlE YOUR IMPACT Live well while doing good By DiANE lEBo wAllACE Cornell Annual

Angenent, Lars T.

44

United States Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyTheTwo New EnergyofDEVELOPMENTEnergyAaronTim Hadley )Kamil

45

An Analysis of Teacher Self-Efficacy, Teacher Trust, and Collective Efficacy in a Southwest Texas School District  

E-Print Network [OSTI]

Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, John Hoyle Committee Members, Virginia Collier Mario Torres Gwendolyn Webb-Hasan... for the advice, expertise, and support. ? Dr. John Hoyle, my chair, for your expert guidance and encouragement along the way. I could not have done it without you. ? Dr. Virginia Collier, Dr. Mario Torres, and Dr. Gwen Webb-Hasan, for sharing your time...

Ball, Jeanette

2011-02-22T23:59:59.000Z

46

Yttrium and rare earth elements in fluids from various deep-sea hydrothermal systems  

SciTech Connect (OSTI)

Rare earth element (REE) and yttrium (Y) concentrations were measured in fluids collected from deep-sea hydrothermal systems including the Mid-Atlantic Ridge (MAR), i.e., Menez Gwen, Lucky Strike, TAG, and Snakepit; the East Pacific Rise (EPR), i.e., 13{degree}N and 17--19{degree}S; and the Lau (Vai Lili) and Manus (Vienna Woods, PacManus, Desmos) Back-arc Basins (BAB) in the South-West Pacific. In most fluids, Y is trivalent and behaves like Ho. Chondrite normalized Y-REE (Y-REE{sub N}) concentrations of fluids from MAR, EPR, and two BAB sites, i.e., Vai Lili and Vienna Woods, showed common patterns with LREE enrichment and positive Eu anomalies. REE analysis of plagioclase collected at Lucky Strike strengthens the idea that fluid REE contents, are controlled by plagioclase phenocrysts. Other processes, however, such as REE complexation by ligands (Cl{sup {minus}}, F{sup {minus}}, So{sub 4}{sup 2{minus}}), secondary phase precipitation, and phase separation modify REE distributions in deep-sea hydrothermal fluids. REE speciation calculations suggest that aqueous REE are mainly complexed by Cl{sup {minus}} ions in hot acidic fluids from deep-sea hydrothermal systems. REE concentrations in the fluid phases are, therefore, influenced by temperature, pH, and duration of rock-fluid interaction. Unusual Y-REE{sub N} patterns found in the PacManus fluids are characterized by depleted LREE and a positive Eu anomaly. The Demos fluid sample shows a flat Y-REE{sub N} pattern, which increases regularly from LREE to HREE with no Eu anomaly. These Manus Basin fluids also have an unusual major element chemistry with relatively high Mg, So{sub 4}, H{sub 2}S, and F contents, which may be due to the incorporation of magmatic fluids into heated seawater during hydrothermal circulation. REE distribution in PacManus fluids may stem from a subseafloor barite precipitation and the REE in Demos fluids are likely influenced by the presence of sulfate ions.

Douville, E. [Univ. Bretagne Occidentale, Brest (France). Dept. de Chimie] [Univ. Bretagne Occidentale, Brest (France). Dept. de Chimie; [IFREMER Centre de Brest, Plouzane (France); Appriou, P. [Univ. Bretagne Occidentale, Brest (France)] [Univ. Bretagne Occidentale, Brest (France); Bienvenu, P. [CEA Cadarache, Saint Paul Lez Durance (France). Lab. d`Analyses Radiochimiques et Chimiques] [CEA Cadarache, Saint Paul Lez Durance (France). Lab. d`Analyses Radiochimiques et Chimiques; Charlou, J.L.; Donval, J.P.; Fouquet, Y. [IFREMER Centre de Brest, Plouzane (France)] [IFREMER Centre de Brest, Plouzane (France); Gamo, Toshitaka [Univ. of Tokyo, Nakano, Tokyo (Japan). Ocean Research Inst.] [Univ. of Tokyo, Nakano, Tokyo (Japan). Ocean Research Inst.

1999-03-01T23:59:59.000Z