Sample records for workstation cluster los

  1. Video Server on an ATM Connected Cluster of Workstations Olav Sandsta, Stein Langrgen, and Roger Midtstraum

    E-Print Network [OSTI]

    Video Server on an ATM Connected Cluster of Workstations Olav Sandst°a, Stein Langørgen, and Roger-7034 Trondheim, Norway folavsa, steinl, rogerg@idi.ntnu.no Abstract Video servers are important for applicationswhich make use of digital video. The video servers should provide better functionality than most

  2. POET on DAISy: Experiences in parallel computing on commodity workstation clusters

    SciTech Connect (OSTI)

    Durant, J.L.; Yam, C.; Bui-Pham, M.; Wyckoff, P.; Armstrong, R. [Sandia National Labs., Livermore, CA (United States)

    1997-12-31T23:59:59.000Z

    Recent years have seen rapid increases in the power of parallel computers. However, easy, efficient use of these resources has been hampered by lack of appropriate software tools. To address this, we have developed POET, the Parallel Object-oriented Environment and Toolkit. POET is a frame-based approach to scientific computing on parallel platforms. It seeks to insulate the user from the details of implementing an efficient parallel solution to the user`s problem, freeing the user to concentrate on the details of the physics behind the model. We will discuss our use of POET on DAISy, our cluster of Pentium Pro workstations.

  3. COMPUTER WORKSTATION ERGONOMIC CHECKLIST COMPUTER WORKSTATION ERGONOMIC CHECKLIST

    E-Print Network [OSTI]

    Saskatchewan, University of

    COMPUTER WORKSTATION ERGONOMIC CHECKLIST 1 COMPUTER WORKSTATION ERGONOMIC CHECKLIST people, task, equipment and work environment. If required, a detailed ergonomic evaluation, including to be in-line with forearms when using keyboard and/or mouse. #12;COMPUTER WORKSTATION ERGONOMIC CHECKLIST

  4. Keeping the workplace safe COMPUTER WORKSTATION

    E-Print Network [OSTI]

    Leistikow, Bruce N.

    Keeping the workplace safe COMPUTER WORKSTATION ERGONOMICS #12;Table of Contents Introduction ................................................................................... 2 Office Ergonomics Process at UCDHS ........................................................ 3 UCDHS Ergonomics Demonstration Room ...............................................16 Reference

  5. Core analysis workstation development and verification

    SciTech Connect (OSTI)

    Mays, C.W.; Kochendarfer, R.A.; Mays, B.E.

    1987-01-01T23:59:59.000Z

    An engineering workstation utilizing a three-dimensional reactor simulator along with a series of auxiliary programs has been developed for use in predicting core reactivity and power distributions. This workstation can be used by both core analysis and core operations personnel. Expected applications are power distribution analyses, technical specification limit verification, and various types of reactivity analyses. Reactor operations personnel can quickly simulate load follow or other reactor maneuvers and, through the interactive graphics capability of the personal computer, the reactor responses, such as power distribution and control rod position, can be displayed and understood by operations personnel.

  6. Los

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

    change vehicle traffic- screening regimen at vehicle inspection station September 1, 2009 Los Alamos, New Mexico, September 1, 2009-Los Alamos National Laboratory is changing its...

  7. Los

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking down the road aheadchange vehicleLos

  8. Unattended ground sensor situation assessment workstation

    SciTech Connect (OSTI)

    Jeppesen, D.; Trellue, R.

    1997-04-01T23:59:59.000Z

    Effective utilization of unattended ground sensors (UGSs) in a theater reconnaissance, surveillance, target acquisition, and kill assessment environment requires that a human operator be able to interpret, and collectively assess, the significance of real time data obtained from UGS emplacements over large geographical regions of interest. The products of this UGS data interpretation and assessment activity can then be used in the decision support process for command level evaluation of appropriate courses of action. Advancements in both sensor hardware technology and in software systems and processing technology have enabled the development of practical real time situation assessment capabilities based upon information from unattended ground sensors. A decision support workstation that employs rule-based expert system processing of reports from unattended ground sensors is described. The primary goal of this development activity is to produce a suite of software to track vehicles using data from unattended ground sensors. The situational assessment products from this system have stand-alone utility, but are also intended to provide cueing support for overhead sensors and supplementary feeds to all-source fusion centers. The conceptual framework, developmental architecture, and demonstration field tests of the system are described.

  9. Impact of workstations on criticality analyses at ABB combustion engineering

    SciTech Connect (OSTI)

    Tarko, L.B.; Freeman, R.S.; O'Donnell, P.F. (ABB Combustion Engineering Nuclear Power, Inc., Windsor, CT (United States))

    1993-01-01T23:59:59.000Z

    During 1991, ABB Combustion Engineering (ABB C-E) made the transition from a CDC Cyber 990 mainframe for nuclear criticality safety analyses to Hewlett Packard (HP)/Apollo workstations. The primary motivation for this change was improved economics of the workstation and maintaining state-of-the-art technology. The Cyber 990 utilized the NOS operating system with a 60-bit word size. The CPU memory size was limited to 131 100 words of directly addressable memory with an extended 250000 words available. The Apollo workstation environment at ABB consists of HP/Apollo-9000/400 series desktop units used by most application engineers, networked with HP/Apollo DN10000 platforms that use 32-bit word size and function as the computer servers and network administrative CPUS, providing a virtual memory system.

  10. Ab initio cluster calculations of hydrogenated GaAs,,001... surfaces Chemical Engineering Department, University of California, Los Angeles, California 90095-1592

    E-Print Network [OSTI]

    Li, Lian

    Ab initio cluster calculations of hydrogenated GaAs,,001... surfaces Q. Fu Chemical Engineering Engineering Department, University of California, Los Angeles, California 90095-1592 Received 11 November 1999 Hydrogen adsorption on the 2 4 and 4 2 reconstructions of gallium arsenide 001 has been studied by internal

  11. VAX Professional Workstation office automation on a shoe-string

    SciTech Connect (OSTI)

    Downward, J.G.

    1983-01-01T23:59:59.000Z

    Over a number of years, KMS developed a number of quick and dirty productivity tools for our technical staff. The availability of a VAX, an increased number of on-line terminals, increased use of the system by non-programmers, and the installation of a non-DEC word processing system quickly brought out the weaknesses in these tools. What was needed was a user-friendly VAX interface for our professional staff that required minimal understanding of VAX, its utilities, or its use. The VAX Professional Workstation is the outgrowth of an effort to provide this functionality without incurring additional software costs. The VAX Professional Workstation provides a menu-driven user interface to (1) VAX document preparation (editing, filing, spelling, formatting and output to a letter-quality printer), (2) file transfer to the non-DEC word processors, (3) calendar management, (4) reminder messages, (5) phone list management, (6) electronic mail, (7) desk calculator, (8) personal databases and (9) user-tailorable workstations. Because the VAX Professional Workstation was targeted for a wide range of technical skill levels, extensive on-line help is provided, and CAI courses are provided to acquaint users with the basic skills and information needed to function in the VAX environment.

  12. REMOTE UNIX TURNING IDLE WORKSTATIONS INTO CYCLE SERVERS

    E-Print Network [OSTI]

    Wisconsin at Madison, University of

    department currently has about 100 MicroVaxII++ workstations, several VAX 11/750's++, and two VAX 11/780's&T Bell Laboratories ++MicroVaxII, VAX 11/750, and VAX 11/780 are trademarks of Digital Equipment

  13. Control of a pulse height analyzer using an RDX workstation

    SciTech Connect (OSTI)

    Montelongo, S.; Hunt, D.N.

    1984-12-01T23:59:59.000Z

    The Nuclear Chemistry Division of Lawrence Livermore National laboratory is in the midst of upgrading its radiation counting facilities to automate data acquisition and quality control. This upgrade requires control of a pulse height analyzer (PHA) from an interactive LSI-11/23 workstation running RSX-11M. The PHA is a micro-computer based multichannel analyzer system providing data acquisition, storage, display, manipulation and input/output from up to four independent acquisition interfaces. Control of the analyzer includes reading and writing energy spectra, issuing commands, and servicing device interrupts. The analyzer communicates to the host system over a 9600-baud serial line using the Digital Data Communications link level Protocol (DDCMP). We relieved the RSX workstation CPU from the DDCMP overhead by implementing a DEC compatible in-house designed DMA serial line board (the ISL-11) to communicate with the analyzer. An RSX I/O device driver was written to complete the path between the analyzer and the RSX system by providing the link between the communication board and an application task. The I/O driver is written to handle several ISL-11 cards all operating in parallel thus providing support for control of multiple analyzers from a single workstation. The RSX device driver, its design and use by application code controlling the analyzer, and its operating environment will be discussed.

  14. REMOTE UNIX TURNING IDLE WORKSTATIONS INTO CYCLE SERVERS

    E-Print Network [OSTI]

    Wisconsin at Madison, University of

    department currently has about 100 MicroVaxII workstations, several VAX 11/750's, and two VAX 11/780's. All. ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ UNIX is a trademark of AT&T Bell Laboratories MicroVaxII, VAX 11/750, and VAX 11/780 are trademarks

  15. High Resolution Timing with Low Resolution Clocks A Microsecond Resolution Timer for Sun Workstations

    E-Print Network [OSTI]

    Melvin, Stephen

    High Resolution Timing with Low Resolution Clocks and A Microsecond Resolution Timer for Sun for Sun 3 and Sun 4 workstations1. One can measure average service times without a high resolution clock?" 1. Introduction - Who Needs a Microsecond Clock Beginning with its Sun 3 workstations, Sun

  16. EMP (electromagnetic pulse) representational tools for personal workstations

    SciTech Connect (OSTI)

    Riley, A.; Shafer, D.

    1987-01-01T23:59:59.000Z

    The ability to rapidly provide a visual representation of a problem set, its accompanying environment, and the variables that directly impact the analysis is of enormous value to the weapons analyst. Parametric, first-principle tools are directly and immediately usable by the analyst to represent the systems under investigation and the effects on those systems by the weapons under analysis. The three tools described, GEOREP, 3-AXIS, and G RANGE, provide these visual, analytic tools directly to the analyst on personal computer workstations. The simplicity and rapidity with which these tools may be used are especially beneficial to weapons analysts dealing with complex phenomena such as EMP. The potential flexibility of these representational tools is shown through examples of notional weapons applications. Use of GEOREP, 3-AXIS, and G RANGE, which augment, rather than supplant, complex weapons effects physics codes, can help provide the necessary, cost-effective guidance for making decisions on detailed case studies.

  17. PRECISIONTM The Dell PrecisionTM M4400 Mobile Workstation, a

    E-Print Network [OSTI]

    Fiebig, Peter

    THE DELL PRECISIONTM M4400 The Dell PrecisionTM M4400 Mobile Workstation, a powerhouse-Core Processors · Up to 8GB1 of high bandwidth dual-channel 800MHz memory · Data security options with Intel

  18. U-192: VMware Workstation/Player VM Remote Device Bug Lets Local...

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

    Player. PLATFORM: Version(s): Workstation 8.x, Player 4.x aBSTRACT: A local or remote user can cause denial of service conditions on the target virtual system. reference...

  19. LOS ALAMOS, New Mexico, June 29, 2010-Los Alamos National Laboratory...

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

    business starts demolition of world's first plutonium processing facility LOS ALAMOS, New Mexico, June 29, 2010-Los Alamos National Laboratory this week began demolishing a cluster...

  20. Ergonomics Self-Evaluation: Computer Workstation Step 1: Adjust the Chair

    E-Print Network [OSTI]

    Johnston, Daniel

    Ergonomics Self-Evaluation: Computer Workstation Step 1: Adjust the Chair a. Seat height ­ Adjust medical condition or ergonomic concern, contact the UT at Austin Occupational Health Program at 512.471.4OHP(4647). http://www.utexas.edu/hr/current/services/ohp.html Ergonomic evaluation services

  1. The ergonomic design of workstations using virtual manufacturing and response surface methodology

    E-Print Network [OSTI]

    Ben-Gal, Irad E.

    The ergonomic design of workstations using virtual manufacturing and response surface methodology- nomic and ergonomic results, a comprehensive study of the task at hand must be conducted and several time and productivity; and (ii) ergonomic measures such as energy exertion, posture analysis

  2. Reducing the Replacement Overhead on COMA Protocols for Workstation-Based Architectures

    E-Print Network [OSTI]

    Llanos, Diego R.

    Reducing the Replacement Overhead on COMA Protocols for Workstation-Based Architectures Diego R discuss the behavior of the replacement mechanism of well-known COMA protocols applied to a loosely replacement mecha- nism in order to select the destination node of a replacement transaction without

  3. On-line continuous unit heat rate measurement using EPRI`s plant monitoring workstation

    SciTech Connect (OSTI)

    Levy, E.; Sarunac, N. [Lehigh Univ., Bethlehem, PA (United States); Schnetzler, D. [Potomac Electric Power Company, Newburg, MD (United States)] [and others

    1995-06-01T23:59:59.000Z

    Software for both the Output/Loss and Boiler-Turbine Cycle Efficiency (BTCE) methods for measuring unit heat rate of pulverized coal units is now available with the latest version of EPRI`s Plant Monitoring Workstation (PMW). Both methods are the latest version of EPRI`s Plant Monitoring Workstation (PMW). Both methods are running continuously and on-line at PEPCO`s Morgantown Unit 2. Comparisons have been made between the results generated by the two methods and with measured plant data for parameters such as coal feed rate and stack gas flow rate. This paper reviews the basis of the two measurement methods, explains how they were implemented at Morgantown Unit 2, and gives results showing how the calculated values compare with measurements for a range of unit operating conditions.

  4. CX-004223: Categorical Exclusion Determination | Department of...

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

    Center for Integrated Nanotechnologies Gateway - Installation and Operation of Computer Workstation Cluster, Los Alamos National Laboratory CX(s) Applied: B1.3 Date: 0519...

  5. An integrated workstation environment for design and evaluation of analog integrated circuits

    E-Print Network [OSTI]

    Soenen, Eric Georges

    1989-01-01T23:59:59.000Z

    40 40 40 41 41 42 42 43 44 45 48 CHAPTER VI THE UNIX OPERATING SYSTEM ON THE HP 9000 Page 49 A. B. C. D. E. G. H. I. J. K. L. Introduction UNIX history and concepts UNIX structure UNIX and C Data redirection and piping... of the research, is to evaluate the system and develop procedures for characterization of electronic devices. Optimal use of hardware and software resources is determined. A network of Hewlett Packard HP 9000 workstations is being set up at the VLSI evaluation...

  6. Application of EPRI`s plant monitoring workstation to NO{sub x} control and performance optimization

    SciTech Connect (OSTI)

    Levy, E.; Eskenazi, D.; D`Agostini, M. [Lehigh Univ., Bethlehem, PA (United States)] [and others

    1995-06-01T23:59:59.000Z

    Investigators from Lehigh University and Potomac Electric Power Company (PEPCO) are involved in the development of boiler tuning techniques for NO{sub x} control and performance optimization. Key to this effort is the availability of EPRI`s Plant Monitoring Workstation (PMW) in utilizing plant data to establish optimal operating conditions and maintain low-NO{sub x} operation over the long term. The various ways in which PMW has been used to characterize the boiler will be described. In addition, future developments with respect to sootblow optimization and a NO{sub x}/performance advisor will be discussed.

  7. CLUSTER CHEMISTRY

    E-Print Network [OSTI]

    Muetterties, Earl L.

    2013-01-01T23:59:59.000Z

    Advanced Inorganic Chemistry, 11 Wiley Huetterties and C. M.Submitted to the Journal of Organometallic ChemistryCLUSTER CHEMISTRY Earl L. Muetterties TWO-WEEK LOAN COPY May

  8. Clustering: Applications

    E-Print Network [OSTI]

    Sharir, Micha

    Data Compression K Image Processing Center for Geometric Computing Motivation Geometric Clustering = function of frequency of word w i in ff: K What is the distance between two documents ff and fi? ffl d (shell) problem. K Cylinder fitting Center for Geometric Computing Statistical Estimators Geometric

  9. Title: Subspace Clustering of Microarray Data based on Domain Transformation Keywords: gene expression, subspace clustering, inverted index, gene-gene rela-

    E-Print Network [OSTI]

    McLeod, Dennis

    of Southern California, Los Angeles, USA #12;Subspace Clustering of Microarray Data based on DomainTitle: Subspace Clustering of Microarray Data based on Domain Transformation Keywords: gene framework that supports the identi- fication of useful knowledge based on data clustering. With the recent

  10. Radial velocities of three poorly studied clusters and the kinematics of open clusters

    SciTech Connect (OSTI)

    Hayes, Christian R.; Friel, Eileen D., E-mail: hayescr@indiana.edu, E-mail: efriel@indiana.edu [Astronomy Department, Indiana University, Bloomington, IN 47405 (United States)

    2014-04-01T23:59:59.000Z

    We present radial velocities for stars in the field of the open star clusters Berkeley 44, Berkeley 81, and NGC 6802 from spectra obtained using the Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5 m telescope. These clusters are of intermediate age (1-3 Gyr), located within the solar Galactocentric radius, and have no previous radial velocity measurements. We find mean radial velocities of –9.6 ± 3.0 km s{sup –1}, 48.1 ± 2.0 km s{sup –1}, and 12.4 ± 2.8 km s{sup –1} for Be 44, Be 81, and NGC 6802, respectively. We present an analysis of radial velocities of 134 open clusters of a wide range of ages using data obtained in this study and the literature. Assuming the system of clusters rotates about the Galactic center with a constant velocity, we find older clusters exhibit a slower rotation and larger line-of-sight (LOS) velocity dispersion than younger clusters. The gradual decrease in rotational velocity of the cluster system with age is accompanied by a smooth increase in LOS velocity dispersion, which we interpret as the effect of heating on the open cluster system over time.

  11. Cluster Statistics

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccessAlamosCharacterization2Climate, Ocean and SeaClotClusterHopper

  12. Large Data Visualization on Distributed Memory Mulit-GPU Clusters

    SciTech Connect (OSTI)

    Childs, Henry R.

    2010-03-01T23:59:59.000Z

    Data sets of immense size are regularly generated on large scale computing resources. Even among more traditional methods for acquisition of volume data, such as MRI and CT scanners, data which is too large to be effectively visualization on standard workstations is now commonplace. One solution to this problem is to employ a 'visualization cluster,' a small to medium scale cluster dedicated to performing visualization and analysis of massive data sets generated on larger scale supercomputers. These clusters are designed to fit a different need than traditional supercomputers, and therefore their design mandates different hardware choices, such as increased memory, and more recently, graphics processing units (GPUs). While there has been much previous work on distributed memory visualization as well as GPU visualization, there is a relative dearth of algorithms which effectively use GPUs at a large scale in a distributed memory environment. In this work, we study a common visualization technique in a GPU-accelerated, distributed memory setting, and present performance characteristics when scaling to extremely large data sets.

  13. Los Alamos National Laboratory's

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

    takes part in Blue Star Museums program May 16, 2012 Free admission for active duty military, their family members LOS ALAMOS, New Mexico, May 16, 2012-Los Alamos National...

  14. Around Los Alamos

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

    Around Los Alamos Plan Your Visit Visit About the Museum Museum Hours Directions & Maps When to Visit Arrange for a Visit Around Los Alamos Contact Us invisible utility element...

  15. Los Alamos, NASA

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

    Unusual light in dark space revealed by Los Alamos, NASA November 7, 2014 Near-infrared data could change the way we think about galaxies LOS ALAMOS, N.M., Nov. 7, 2014-By looking...

  16. Los Alamos, New Mexico, September 8, 2009- Los Alamos National...

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

    Los Alamos science discoveries unveiled September 15 September 8, 2009 Los Alamos, New Mexico, September 8, 2009- Los Alamos National Laboratory scientists will share their...

  17. Clustering 16S rRNA for OTU prediction: a method of unsupervised Bayesian clustering

    E-Print Network [OSTI]

    Chen, Ting

    clusters based on the natural organization of data without setting a hard cut-off threshold (3, University of Southern California, University Park, Los Angeles, CA 90089, USA and 2MOE Key Laboratory Windows. Contact: tingchen@usc.edu Supplementary information: Supplementary data are available

  18. Los Alamos National Laboratory

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

    4th Hazmat Challenge July 22, 2010 Competition tests skills of hazardous materials response teams LOS ALAMOS, New Mexico, July 22, 2010-Fourteen hazardous materials response teams...

  19. Los Alamos National Laboratory

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

    the first results of joint work by scientists from Lawrence Berkeley, Pacific Northwest, Savannah River, and Los Alamos national laboratories at the Savannah River Site to model...

  20. Los Alamos National Laboratory

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

    describes storm damage to environmental monitoring stations, canyons September 18, 2013 Stations supporting Santa Fe water utility returned to service LOS ALAMOS, N.M., Sept. 20,...

  1. Los Alamos National Laboratory

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

    23, 2013-Nearly 400 Los Alamos National Laboratory employees on 47 teams received Pollution Prevention awards for protecting the environment and saving taxpayers more than 8...

  2. Los Alamos National Laboratory

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

    played in saving his life. Charlton Heston FROM MOUNT SINAI TO LOS ALAMOS Trinitite, a rock containing glassy parts created inside the fireball from the world's first nuclear...

  3. Literature Review on Spectral Clustering

    E-Print Network [OSTI]

    Chen, Mengna

    2013-01-01T23:59:59.000Z

    Guan & Kulis. Kernel k-means, Spectral Clustering andspectral clustering and k-means clustering and spectralRelationship with kernel K-means algorithm …………………………………………

  4. Stockpile Stewardship: Los Alamos

    SciTech Connect (OSTI)

    McMillan, Charlie; Morgan, Nathanial; Goorley, Tom; Merrill, Frank; Funk, Dave; Korzekwa, Deniece; Laintz, Ken

    2012-01-26T23:59:59.000Z

    "Heritage of Science" is a short video that highlights the Stockpile Stewardship program at Los Alamos National Laboratory. Stockpile Stewardship was conceived in the early 1990s as a national science-based program that could assure the safety, security, and effectiveness of the U.S. nuclear deterrent without the need for full-scale underground nuclear testing. This video was produced by Los Alamos National Laboratory for screening at the Lab's Bradbury Science Museum in Los Alamos, NM and is narrated by science correspondent Miles O'Brien.

  5. Stockpile Stewardship: Los Alamos

    ScienceCinema (OSTI)

    McMillan, Charlie; Morgan, Nathanial; Goorley, Tom; Merrill, Frank; Funk, Dave; Korzekwa, Deniece; Laintz, Ken

    2014-08-12T23:59:59.000Z

    "Heritage of Science" is a short video that highlights the Stockpile Stewardship program at Los Alamos National Laboratory. Stockpile Stewardship was conceived in the early 1990s as a national science-based program that could assure the safety, security, and effectiveness of the U.S. nuclear deterrent without the need for full-scale underground nuclear testing. This video was produced by Los Alamos National Laboratory for screening at the Lab's Bradbury Science Museum in Los Alamos, NM and is narrated by science correspondent Miles O'Brien.

  6. Los Alamos National Laboratory

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

    strategy for long-term environmental sustainability March 1, 2013 Blueprint for planning work activities with the environment in mind LOS ALAMOS, N.M., March 1, 2013-The Department...

  7. LOS ALAMOS, New Mexico, December 16, 2010-Los Alamos National...

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

    16, 2010 New LANL marks set for field investigations, shipments to WIPP LOS ALAMOS, New Mexico, December 16, 2010-Los Alamos National Laboratory finished 12 months worth of...

  8. Los Alamos National Security LLC Selected to Manage Los Alamos...

    Office of Environmental Management (EM)

    to be the management and operations contractor for Los Alamos National Laboratory in New Mexico. Los Alamos National Security LLC is a limited liability corporation made up of...

  9. LOS ALAMOS, New Mexico, December 20, 2010-Los Alamos National...

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

    Top 10 science & technology developments of 2010 December 20, 2010 LOS ALAMOS, New Mexico, December 20, 2010-Los Alamos National Laboratory has named its Top 10 science and...

  10. LOS ALAMOS, New Mexico, September 1, 2010-Los Alamos National...

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

    1, 2010 Buildings would replace existing facilities at Technical Area 54 LOS ALAMOS, New Mexico, September 1, 2010-Los Alamos National Laboratory today announced it has obtained...

  11. LOS ALAMOS, New Mexico, September 2, 2008-Los Alamos National...

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

    of partner for venture acceleration initiative September 2, 2008 LOS ALAMOS, New Mexico, September 2, 2008-Los Alamos National Laboratory (LANL) and its operating...

  12. Architectural Support for System Software on Large-Scale Clusters Juan Fernandez Eitan Frachtenberg Fabrizio Petrini Kei Davis

    E-Print Network [OSTI]

    Frachtenberg, Eitan

    , the role of the This work is supported by the U.S. Department of Energy through Los Alamos National Computer and Computational Sciences (CCS) Division Los Alamos National Laboratory, Los Alamos, NM 87545 USA include the communication library, the resource manager, the parallel file system, the cluster monitoring

  13. Two Los Alamos National Laboratory

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

    event in Albuquerque LOS ALAMOS, N.M., March 26, 2015-Los Alamos National Laboratory's Nuclear Material Control and Accountability Group and the Quality and Performance...

  14. Los Alamos National Laboratory selects

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

    selects small businesses for nuclear waste services February 16, 2012 Subcontract worth up to 200 million over five years LOS ALAMOS, New Mexico, February 16, 2012-Los Alamos...

  15. Los Alamos Dynamics Summer School

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

    School The Sixteenth Los Alamos Dynamics Summer School EXTENDED DEADLINES Los Alamos Dynamics Summer School Overview Contact Institute Director Charles Farrar (505) 663-5330...

  16. Upper Los Alamos Canyon Cleanup

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

    Upper Los Alamos Canyon Cleanup The Upper Los Alamos Canyon Project involves cleaning up hazardous materials left over from some of the Laboratory's earliest activities. Contact...

  17. Recap Clustering: Introduction Clustering in IR K-means Evaluation How many clusters? Introduction to Information Retrieval

    E-Print Network [OSTI]

    Nejdl, Wolfgang

    Recap Clustering: Introduction Clustering in IR K-means Evaluation How many clusters? Introduction;Recap Clustering: Introduction Clustering in IR K-means Evaluation How many clusters? Overview 1 Recap 2 Clustering: Introduction 3 Clustering in IR 4 K-means 5 Evaluation 6 How many clusters? Sch¨utze: Flat

  18. Los Alamos, NASA

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8, 2014 LosUnusual light

  19. Around Los Alamos

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWP TWPAlumni AlumniFederal FacilityAprilAreAround Los Alamos Around Los

  20. This paper presents the case for using personal computers as workstations. The argument is based on the performance of CISC processors using a 32 bit operating system. The authors have developed a set of simple benchmarks that measure integer, floating po

    E-Print Network [OSTI]

    Miller, Ethan L.

    processors perform the benchmarks 1.25 to 7.25 times faster using Linux than with the MS-DOS and Windows workstation environment. Again, the personal computer performed adequately. Given the price difference between

  1. Bakersfield Los Angeles

    E-Print Network [OSTI]

    Angeles San Francisco California's Electric Transmission Lines Source: California Energy Commission (Arizona) E OWNERS All Other Owners San Diego Gas & Electric (SDG&E) Los Angeles Dept. of Water & Power California Energy Commission Siting, Transmission & Environmental Protection Division Cartography Unit www

  2. Nmeros complejos. Los cuaterniones.

    E-Print Network [OSTI]

    Pinasco, Juan Pablo

    vulgarizadores que toman de Hamilton y Grassman lo que se ha llamado " cálculo vectorial"." Algebra lineal yEl Algebra Números complejos. Los cuaterniones. El álgebra vectorial. Las estructuras modernas. JPP-1930: Grupos (de permutaciones), Anillos (de polinomios, de enteros gaussianos), Algebras (de matrices, de

  3. Clustering versus non-clustering phase synchronizations

    SciTech Connect (OSTI)

    Liu, Shuai [Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 (China) [Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Zhan, Meng, E-mail: zhanmeng@wipm.ac.cn [Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 (China)] [Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 (China)

    2014-03-15T23:59:59.000Z

    Clustering phase synchronization (CPS) is a common scenario to the global phase synchronization of coupled dynamical systems. In this work, a novel scenario, the non-clustering phase synchronization (NPS), is reported. It is found that coupled systems do not transit to the global synchronization until a certain sufficiently large coupling is attained, and there is no clustering prior to the global synchronization. To reveal the relationship between CPS and NPS, we further analyze the noise effect on coupled phase oscillators and find that the coupled oscillator system can change from CPS to NPS with the increase of noise intensity or system disorder. These findings are expected to shed light on the mechanism of various intriguing self-organized behaviors in coupled systems.

  4. MultiCriteria Clustering & Classification

    E-Print Network [OSTI]

    Libre de Bruxelles, Université

    An Extension of the K-Means' algorithm MultiCriteria Ordered Clustering 6 MCDA Classification : Sorting MCDACriteria Comparison : motivation A MCDA approach for grouping problems 5 MCDA Clustering Multicriteria Clustering

  5. Cold cluster ferromagnetism

    SciTech Connect (OSTI)

    Bertsch, G.F. [Institute for Nuclear Theory and Department of Physics FM-15, University of Washington, Seattle, Washington 98195 (United States)] [Institute for Nuclear Theory and Department of Physics FM-15, University of Washington, Seattle, Washington 98195 (United States); Yabana, K. [Department of Physics, Niigata University, Niigata 950-21 (Japan)] [Department of Physics, Niigata University, Niigata 950-21 (Japan)

    1994-03-01T23:59:59.000Z

    We examine the magnetic-moment distribution of ferromagnetic clusters under conditions where the magnetic moment is aligned with the internal cluster axis. Analytic expressions are obtained for the moment distribution and the adiabatic average moment induced in low fields. The result differs from the low-field Langevin function by a factor 2/3.

  6. Cool Cluster Correctly Correlated

    SciTech Connect (OSTI)

    Sergey Aleksandrovich Varganov

    2005-12-17T23:59:59.000Z

    Atomic clusters are unique objects, which occupy an intermediate position between atoms and condensed matter systems. For a long time it was thought that physical and chemical properties of atomic dusters monotonically change with increasing size of the cluster from a single atom to a condensed matter system. However, recently it has become clear that many properties of atomic clusters can change drastically with the size of the clusters. Because physical and chemical properties of clusters can be adjusted simply by changing the cluster's size, different applications of atomic clusters were proposed. One example is the catalytic activity of clusters of specific sizes in different chemical reactions. Another example is a potential application of atomic clusters in microelectronics, where their band gaps can be adjusted by simply changing cluster sizes. In recent years significant advances in experimental techniques allow one to synthesize and study atomic clusters of specified sizes. However, the interpretation of the results is often difficult. The theoretical methods are frequently used to help in interpretation of complex experimental data. Most of the theoretical approaches have been based on empirical or semiempirical methods. These methods allow one to study large and small dusters using the same approximations. However, since empirical and semiempirical methods rely on simple models with many parameters, it is often difficult to estimate the quantitative and even qualitative accuracy of the results. On the other hand, because of significant advances in quantum chemical methods and computer capabilities, it is now possible to do high quality ab-initio calculations not only on systems of few atoms but on clusters of practical interest as well. In addition to accurate results for specific clusters, such methods can be used for benchmarking of different empirical and semiempirical approaches. The atomic clusters studied in this work contain from a few atoms to tens of atoms. Therefore, they are quantum objects. Some qualitative information about the geometries of such clusters can be obtained with classical empirical methods, for example geometry optimization using an empirical Lennard-Jones potential. However, to predict their accurate geometries and other physical and chemical properties it is necessary to solve a Schroedinger equation. If one is not interested in dynamics of clusters it is enough to solve the stationary (time-independent) Schroedinger equation (H{Phi}=E{Phi}). This equation represents a multidimensional eigenvalue problem. The solution of the Schroedinger equation is a set of eigenvectors (wave functions) and their eigenvalues (energies). The lowest energy solution (wave function) corresponds to the ground state of the cluster. The other solutions correspond to excited states. The wave function gives all information about the quantum state of the cluster and can be used to calculate different physical and chemical properties, such as photoelectron, X-ray, NMR, EPR spectra, dipole moment, polarizability etc. The dimensionality of the Schroedinger equation is determined by the number of particles (nuclei and electrons) in the cluster. The analytic solution is only known for a two particle problem. In order to solve the equation for clusters of interest it is necessary to make a number of approximations and use numerical methods.

  7. LOS ALAMOS, New Mexico, December 14, 2010-Los Alamos National...

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

    2010 Company will remove buried waste pipes from historic Cold War site LOS ALAMOS, New Mexico, December 14, 2010-Los Alamos National Laboratory today announced it has selected a...

  8. LOS ALAMOS, New Mexico, February 12, 2008-Los Alamos National...

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

    fuel concept to steal CO2 from air February 12, 2008 Green Freedom(tm) for carbon-neutral, sulfur-free fuel and chemical production LOS ALAMOS, New Mexico, February 12, 2008-Los...

  9. Nature Climate Change features Los

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

    Climate Change features Los Alamos forest research February 27, 2013 New print edition of journal tags tree-stress project for cover story LOS ALAMOS, N.M., Feb. 27, 2013-The print...

  10. Why Los Angeles Spanish Matters

    E-Print Network [OSTI]

    Villarreal, Belén

    2013-01-01T23:59:59.000Z

    in Los Angeles. References Chinchilla, Norma; Nora Hamilton;s and 1980’s, however, Chinchilla, Hamilton and Loucky (

  11. Clustering in nuclear environment

    E-Print Network [OSTI]

    G. Röpke

    2014-08-12T23:59:59.000Z

    The properties of few-body clusters (mass number $A \\le 4$) are modified if they are immersed in a nuclear medium. In particular, Pauli blocking that reflects the antisymmetrization of the many-body wave function is responsible for the medium modification of light clusters and the dissolution with increasing density. A more consistent description is given with takes also the contribution of correlations in the continuum into account. The relation between cluster formation in warm dense matter and in nuclear structure is discussed.

  12. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking downDosimetry ReportLos

  13. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking downDosimetry ReportLosMay 14,

  14. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking downDosimetry ReportLosMay

  15. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking downDosimetry ReportLosMay

  16. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5 million todescribespledgeLos Alamos

  17. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5 million todescribespledgeLos Alamos

  18. Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5 million todescribespledgeLos

  19. Los Alamos physicist Hockaday

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos Alamos

  20. Los Alamos VISTAS

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwardspublic Environmental dataLasLos Alamos VISTAS

  1. Clusters and entrepreneurship

    E-Print Network [OSTI]

    Delgado, Mercedes

    This article examines the role of regional clusters in regional entrepreneurship. We focus on the distinct influences of convergence and agglomeration on growth in the number of start-up firms as well as in employment in ...

  2. Open Cluster Open Cluster Open Cluster A group of several thousand stars

    E-Print Network [OSTI]

    Bechtold, Jill

    Open Cluster Open Cluster Open Cluster A group of several thousand stars which formed within the same nebula. The Pleides, or Seven Sisters, are the most visible stars in this cluster in the Milky Way. Mass:10-10,000 SM StarPower Points: 11 A group of several thousand stars which formed within the same

  3. Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Dogliani, Harold O [Los Alamos National Laboratory

    2011-01-19T23:59:59.000Z

    The purpose of the briefing is to describe general laboratory technical capabilities to be used for various groups such as military cadets or university faculty/students and post docs to recruit into a variety of Los Alamos programs. Discussed are: (1) development and application of high leverage science to enable effeictive, predictable and reliability outcomes; (2) deter, detect, characterize, reverse and prevent the proliferation of weapons of mass destruction and their use by adversaries and terrorists; (3) modeling and simulation to define complex processes, predict outcomes, and develop effective prevention, response, and remediation strategies; (4) energetic materials and hydrodynamic testing to develop materials for precise delivery of focused energy; (5) materials cience focused on fundamental understanding of materials behaviors, their quantum-molecular properties, and their dynamic responses, and (6) bio-science to rapidly detect and characterize pathogens, to develop vaccines and prophylactic remedies, and to develop attribution forensics.

  4. Control rod cluster arrangement

    SciTech Connect (OSTI)

    Orr, W.L.; Doshi, P.K.; Mildrum, C.M.; Freeman, T.R.

    1987-02-10T23:59:59.000Z

    This patent describes a nuclear reactor including nuclear core which is cooled and moderated by light water, the nuclear core comprising a plurality of parallel arranged openings therethrough and interspersed among the fuel assemblies. A control rod cluster arrangement comprises load follow control rod cluster assemblies with each load follow control rod cluster assembly being adapted to slidingly fit within each of some of the fuel assemblies in the parallel arranged openings, the load follow control rod cluster assemblies each comprising a plurality of elongated parallel arranged rods attached to a single spider, and including a first group of rods and a second group of rods, the first group of rods and the second each consisting of a plurality of absorber rods. The first group of rods consist of absorber rods taken from the group consisting of B/sub 4/C, hafnium, or silver-indium-cadmium and the second group of rods consist of absorber rods each consisting of stainless steel, the first group of rods and the second group of rods each being integrally attached at all times to the single spider, the absorber rods of the second group of rods being dispersed throughout the control rod cluster assembly. The first group of rods have a first neutron capture cross section and the second group of rods have a second neutron capture cross section different from the first cross section.

  5. ROTATING GLOBULAR CLUSTERS

    SciTech Connect (OSTI)

    Bianchini, P.; Varri, A. L. [Now at Department of Astronomy, Indiana University, 727 East 3rd Street, Swain West 319, Bloomington, IN 47405-7105 (United States); Bertin, G.; Zocchi, A., E-mail: bianchini@mpia.de [Dipartimento di Fisica, Universita degli Studi di Milano, via Celoria 16, I-20133 Milano (Italy)

    2013-07-20T23:59:59.000Z

    Internal rotation is thought to play a major role in the dynamics of some globular clusters. However, in only a few cases has internal rotation been studied by the quantitative application of realistic and physically justified global models. Here, we present a dynamical analysis of the photometry and three-dimensional kinematics of {omega} Cen, 47 Tuc, and M15, by means of a recently introduced family of self-consistent axisymmetric rotating models. The three clusters, characterized by different relaxation conditions, show evidence of differential rotation and deviations from sphericity. The combination of line-of-sight velocities and proper motions allows us to determine their internal dynamics, predict their morphology, and estimate their dynamical distance. The well-relaxed cluster 47 Tuc is interpreted very well by our model; internal rotation is found to explain the observed morphology. For M15, we provide a global model in good agreement with the data, including the central behavior of the rotation profile and the shape of the ellipticity profile. For the partially relaxed cluster {omega} Cen, the selected model reproduces the complex three-dimensional kinematics; in particular, the observed anisotropy profile, characterized by a transition from isotropy to weakly radial anisotropy and then to tangential anisotropy in the outer parts. The discrepancy found for the steep central gradient in the observed line-of-sight velocity dispersion profile and for the ellipticity profile is ascribed to the condition of only partial relaxation of this cluster and the interplay between rotation and radial anisotropy.

  6. Los Alamos National Laboratory opens

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

    brought a third waste repackaging facility online to increase its capability to process nuclear waste for permanent disposal. The "375 box line facility" enables Los Alamos to...

  7. Los Alamos Dynamics Summer School

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

    School The Sixteenth Los Alamos Dynamics Summer School Program Information and Application Process Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff...

  8. Thermodynamics of clusterized matter

    E-Print Network [OSTI]

    Ad. R. Raduta; F. Gulminelli

    2009-08-26T23:59:59.000Z

    Thermodynamics of clusterized matter is studied in the framework of statistical models with non-interacting cluster degrees of freedom. At variance with the analytical Fisher model, exact Metropolis simulation results indicate that the transition from homogeneous to clusterized matter lies along the $\\rho=\\rho_0$ axis at all temperatures and the limiting point of the phase diagram is not a critical point even if the surface energy vanishes at this point. Sensitivity of the inferred phase diagram to the employed statistical framework in the case of finite systems is discussed by considering the grand-canonical and constant-pressure canonical ensembles. A Wigner-Seitz formalism in which the fragment charge is neutralized by an uniform electron distribution allows to build the phase diagram of neutron star matter.

  9. UNIVERSITY OF CALIFORNIA Los Angeles

    E-Print Network [OSTI]

    Stenstrom, Michael K.

    UNIVERSITY OF CALIFORNIA Los Angeles Application of Knowledge-Based Classification Techniques of California, Los Angeles 2005 #12;iii Table of Contents Signature Page ii Table of Contents iii List.5 Image Data 20 2.6 References 25 3 Digital Image Processing 28 3.1 Image Rectification and Restoration 28

  10. University of California Los Angeles

    E-Print Network [OSTI]

    Carter, Troy

    University of California Los Angeles Composition of the Highest Energy Cosmic Rays A dissertation University of California, Los Angeles 2007 ii #12;I dedicate this work to my grandfather David Dieterle, a North Dakota wheat farmer and a man of limited education but an unlimited fascination for the marvels

  11. Spectral Clustering for Complex Settings

    E-Print Network [OSTI]

    Wang, Xiang

    2013-01-01T23:59:59.000Z

    and T. Li. Integrated KL (K-means - Laplacian) clustering: Aschemes, such as K-means, hierarchical clustering, densityclustering algorithms such as K-means can only find a local

  12. Logistics clusters : prevalence and impact

    E-Print Network [OSTI]

    Rivera Virgüez, Myriam Liliana

    2014-01-01T23:59:59.000Z

    Governments around the world are investing significant resources in the development and expansion of logistics clusters. This dissertation analyzes the cluster phenomenon focusing on four topics. First, it develops a ...

  13. Nonparametric Bayesian analysis of some clustering problems

    E-Print Network [OSTI]

    Ray, Shubhankar

    2006-10-30T23:59:59.000Z

    it useful for clustering problems where the number of clusters is unknown. We develop nonparametric Bayesian models for two different clustering problems, namely functional and graphical clustering. We propose a nonparametric Bayes wavelet model...

  14. Clustering Chain Additional options

    E-Print Network [OSTI]

    Linial, Michal

    ProtoClass -rationale and concept ProtoNet in brief AND BEYOND: Functional roadmap in Proto-à-vis InterPro, SCOP, FSSP etc #12;6 ProtoClass Road-Maps A horizontal view provides `distances' between clusters. Those are the basis for creating Road-Maps. We test the biological content of those road maps

  15. The Globular Cluster Luminosity Function

    E-Print Network [OSTI]

    Dean E. McLaughlin

    2003-02-14T23:59:59.000Z

    The main aspects of the globular cluster luminosity function needing to be explained by a general theory of cluster formation are reviewed, and the importance of simultaneously understanding globular cluster systematics (the fundamental plane) within such a theory is pointed out.

  16. Derivatized gold clusters and antibody-gold cluster conjugates

    DOE Patents [OSTI]

    Hainfeld, J.F.; Furuya, F.R.

    1994-11-01T23:59:59.000Z

    Antibody- or antibody fragment-gold cluster conjugates are shown wherein the conjugate size can be as small as 5.0 nm. Methods and reagents are disclosed in which antibodies, Fab' or F(ab')[sub 2] fragments are covalently bound to a stable cluster of gold atoms. The gold clusters may contain 6, 8, 9, 11, 13, 55 or 67 gold atoms in their inner core. The clusters may also contain radioactive gold. The antibody-cluster conjugates are useful in electron microscopy applications as well as in clinical applications that include imaging, diagnosis and therapy. 7 figs.

  17. Using the central VAX cluster at ANL

    SciTech Connect (OSTI)

    Caruthers, C.M.; Vote, S.L. [eds.; Lifka, D.A.; Raffenetti, R.C.

    1992-08-01T23:59:59.000Z

    This report is a manual that discusses the following topics on the Central Vax Cluster at ANL: What the Central Vax Cluster is; how the Vax Cluster works; operational policies; getting started; using tapes; printing on the Vax Cluster; developing programs in VMS; using the X window system on the Central Vax Cluster; and using Central Vax Cluster file sharing services.

  18. Radio Bubbles in Clusters

    E-Print Network [OSTI]

    R. J. H. Dunn; A. C. Fabian; G. B. Taylor

    2005-10-06T23:59:59.000Z

    We extend our earlier work on cluster cores with distinct radio bubbles, adding more active bubbles, i.e. those with Ghz radio emission, to our sample, and also investigating ``ghost bubbles,'' i.e. those without GHz radio emission. We have determined k, which is the ratio of the total particle energy to that of the electrons radiating between 10 MHz and 10 GHz. Constraints on the ages of the active bubbles confirm that the ratio of the energy factor, k, to the volume filling factor, f lies within the range 1 < k/f < 1000. In the assumption that there is pressure equilibrium between the radio-emitting plasma and the surrounding thermal X-ray gas, none of the radio lobes has equipartition between the relativistic particles and the magnetic field. A Monte-Carlo simulation of the data led to the conclusion that there are not enough bubbles present in the current sample to be able to determine the shape of the population. An analysis of the ghost bubbles in our sample showed that on the whole they have higher upper limits on k/f than the active bubbles, especially when compared to those in the same cluster. A study of the Brightest 55 cluster sample shows that 17, possibly 20, clusters required some form of heating as they have a short central cooling time, t_cool < 3 Gyr, and a large central temperature drop, T_centre/T_outer< 1/2. Of these between 12 (70 per cent) and 15 (75 per cent), contain bubbles. This indicates that the duty cycle of bubbles is large in such clusters and that they can play a major role in the heating process.

  19. The DART dispersion analysis research tool: A mechanistic model for predicting fission-product-induced swelling of aluminum dispersion fuels. User`s guide for mainframe, workstation, and personal computer applications

    SciTech Connect (OSTI)

    Rest, J.

    1995-08-01T23:59:59.000Z

    This report describes the primary physical models that form the basis of the DART mechanistic computer model for calculating fission-product-induced swelling of aluminum dispersion fuels; the calculated results are compared with test data. In addition, DART calculates irradiation-induced changes in the thermal conductivity of the dispersion fuel, as well as fuel restructuring due to aluminum fuel reaction, amorphization, and recrystallization. Input instructions for execution on mainframe, workstation, and personal computers are provided, as is a description of DART output. The theory of fission gas behavior and its effect on fuel swelling is discussed. The behavior of these fission products in both crystalline and amorphous fuel and in the presence of irradiation-induced recrystallization and crystalline-to-amorphous-phase change phenomena is presented, as are models for these irradiation-induced processes.

  20. Independent Oversight Review, Los Alamos National Laboratory...

    Energy Savers [EERE]

    National Laboratory - November 2013 Independent Oversight Review, Los Alamos National Laboratory - November 2013 November 2013 Review of the Los Alamos National Laboratory...

  1. Los Alamos Dynamics Summer School Projects

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

    School-Overview Los Alamos Dynamics Summer School Projects Los Alamos Dynamics Summer School Projects and Resources Contact Institute Director Charles Farrar (505) 663-5330 Email...

  2. Supercomputing Challenge top winners: Los Alamos schools

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

    Supercomputing Challenge top winners: Los Alamos schools Supercomputing Challenge top winners: Los Alamos schools Cole Kendrick won the top prize for his research project,...

  3. LOS ALAMOS NATIONAL LABORATORY - EXPRESS LICENSING PROGRAM

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

    LOS ALAMOS NATIONAL LABORATORY - EXPRESS LICENSING PROGRAM NON-EXCLUSIVE PATENT LICENSE AGREEMENT This Agreement between Los Alamos National Security, LLC ("LANS"), under its...

  4. Independent Activity Report, Los Alamos National Laboratory ...

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

    2012 Independent Oversight Review, Los Alamos National Laboratory Chemistry and Metallurgy Research Facility - January 2012 Independent Oversight Review, Los Alamos Site...

  5. Independent Oversight Review, Los Alamos National Laboratory...

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

    2013 Independent Oversight Review, Los Alamos National Laboratory Chemistry and Metallurgy Research Facility - January 2012 Independent Activity Report, Los Alamos Site Office...

  6. Independent Oversight Review, Los Alamos National Laboratory...

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

    Review, Los Alamos National Laboratory - September 2011 Independent Oversight Review, Los Alamos National Laboratory Chemistry and Metallurgy Research Facility - January 2012...

  7. Constraints on Cluster Formation from Old Globular CLuster Systems

    E-Print Network [OSTI]

    Dean E. McLaughlin

    2000-02-03T23:59:59.000Z

    The properties of old globular cluster systems (GCSs) in galaxy halos offer unique insight into the physical processes that conspire to form any generic star cluster, at any epoch. Presented here is a summary of the information obtained from (1) the specific frequencies (total populations) and spatial structures (density vs. galactocentric radius) of GCSs in early-type galaxies, as they relate to the efficiency (or probability) of bound cluster formation, and (2) the fundamental role of a scaling between cluster mass and energy among Galactic globulars in setting their other structural correlations, and the possible implications for star formation efficiency as a function of mass in gaseous protoclusters.

  8. Graph partitioning advance clustering technique

    E-Print Network [OSTI]

    Madhulatha, T Soni

    2012-01-01T23:59:59.000Z

    Clustering is a common technique for statistical data analysis, Clustering is the process of grouping the data into classes or clusters so that objects within a cluster have high similarity in comparison to one another, but are very dissimilar to objects in other clusters. Dissimilarities are assessed based on the attribute values describing the objects. Often, distance measures are used. Clustering is an unsupervised learning technique, where interesting patterns and structures can be found directly from very large data sets with little or none of the background knowledge. This paper also considers the partitioning of m-dimensional lattice graphs using Fiedler's approach, which requires the determination of the eigenvector belonging to the second smallest Eigenvalue of the Laplacian with K-means partitioning algorithm.

  9. The Cluster SZ -- Mass Correlation

    E-Print Network [OSTI]

    Christopher A. Metzler

    1998-12-16T23:59:59.000Z

    N-body + hydrodynamic simulations of galaxy clusters are used to demonstrate a correlation between galaxy cluster mass and the strength of the Sunyaev-Zel'dovich (SZ) effect induced by the cluster. The intrinsic scatter in the correlaton is larger than seen in the cluster mass -- X-ray temperature correlation, but smaller than seen in the correlation between mass (or temperature) and X-ray luminosity, as expected. Using the convergence to self-similarity of cluster structure at larger radii, a simple area-averaged SZ value derived from mock SZ maps also correlates well with mass; the intrinsic scatter in this correlation is comparable to that seen in simulations for the mass -- temperature correlation. Such a relation may prove a powerful tool for estimating cluster masses at higher redshifts.

  10. Cluster structures in Oxygen isotopes

    E-Print Network [OSTI]

    N. Furutachi; M. kimura; A. Doté; Y. Kanada-En'yo; S. oryu

    2007-06-01T23:59:59.000Z

    Cluster structure of 16O,18O and 20O is investigated by the antisymmettrized molecular dynamics (AMD) plus generator coordinate method (GCM). We have found the K^{\\pi}=0$_2^+$ and 0$_1^-$ rotational bands of 18O that have the prominent 14C+\\alpha cluster structure. Clustering systematics becomes richer in 20O. We suggest the K^{\\pi}=0$_2^+$ band that is the mixture of the 12C+\\alpha+4n and 14C+6He cluster structures, and the K^{\\pi}=0$_1^-$ band that has the 14C+6He cluster structure. The K^{\\pi}=0$_3^+$ and 0$_2^-$ bands that have the prominent 16C+\\alpha cluster structure are also found.

  11. Globular Clusters in Dwarf Galaxies

    E-Print Network [OSTI]

    Bryan W. Miller

    2006-06-02T23:59:59.000Z

    Recent work on globular cluster systems in dwarf galaxies outside the Local Group is reviewed. Recent large imaging surveys with the Hubble Space Telescope and follow-up spectroscopy with 8-m class telescopes now allow us to compare the properties of massive star clusters in a wide range of galaxy types and environments. This body of work provides important constraints for theories of galaxy and star cluster formation and evolution.

  12. From clusters to clouds | EMSL

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

    experimental data to quantum chemical calculations of cluster dissociation thermodynamics and determined that loss of either an ammonia molecule or an ammonium bisulfate...

  13. Are Cluster Dwarfs Recycled Galaxies?

    E-Print Network [OSTI]

    Christopher J. Conselice

    2003-12-12T23:59:59.000Z

    Although cluster dwarf galaxies are often neglected due to their faintness, recent observations demonstrate that they are critical for understanding the physical processes behind galaxy and cluster formation. Dwarfs are the most common galaxy type and are particularly abundant in clusters. Recent observational results suggest that dwarfs in dense environments do not all form early in the universe, as expected from hierarchical structure formation models. Many of these systems appear to be younger and more metal rich than dwarfs in lower density areas, suggesting they are possibly created by a tidal process. Several general galaxy cluster observations, including steep luminosity functions and the origin of intracluster light, are natural outcomes of these processes.

  14. Cluster Compatibility Mode

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccessAlamosCharacterization2Climate, Ocean and SeaClotCluster

  15. Cluster Compatibility Mode

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccessAlamosCharacterization2Climate, Ocean and SeaClotClusterHopper

  16. Los Alamos ScienceFest

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests in Santa FeLANS,LosNewsLos

  17. Los Alamos scientist Christopher Lee

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos AlamosLosChristopher

  18. Los Alamos honors Laboratory Fellows

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwardspublicexceeds waste shipping goal LosNuclearLos

  19. Incremental Hierarchical Clustering of Text Documents

    E-Print Network [OSTI]

    Gordon, Geoffrey J.

    distribution is demonstrated. 1 Introduction Document clustering is an effective tool to manage informationIncremental Hierarchical Clustering of Text Documents by Nachiketa Sahoo Adviser: Jamie Callan May 5, 2006 Abstract Incremental hierarchical text document clustering algorithms are important

  20. Relative Ages of Globular Clusters

    E-Print Network [OSTI]

    Thomas H. Puzia

    2002-10-18T23:59:59.000Z

    Ages of extragalactic globular clusters can provide valuable insights into the formation and evolution of galaxies. In this contribution the photometric methods of age dating old globular cluster systems are summarised. The spectroscopic approach is reviewed with an emphasis of the right choice of age diagnostics. We present a new method of quantifying the relatively best age-sensitive spectroscopic index given the quality of a data set and a certain theoretical stellar synthesis model. The relatively best diagnostic plot is constructed from the set of Lick indices and used to age date globular clusters in several early-type galaxies which are part of a large spectroscopic survey of extragalactic globular cluster systems. We find that, independently of host galaxy, metal-poor ([Fe/H] 8 Gyr) and coeval. Metal-rich clusters show a wide range of ages from ~15 down to a few Gyr.

  1. Additive Manufacturing Cluster Strategy | ornl.gov

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

    Additive Manufacturing Cluster Strategy SHARE Additive Manufacturing Cluster Strategy As the nation's premier research laboratory, ORNL is one of the world's most capable resources...

  2. Fragmentation Energetics of Clusters Relevant to Atmospheric...

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

    of Clusters Relevant to Atmospheric New Particle Formation. Fragmentation Energetics of Clusters Relevant to Atmospheric New Particle Formation. Abstract: The exact mechanisms by...

  3. LOS

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

    of Korea), Clifton E. Barry 3rd, Laura E. Via (Tuberculosis Research Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD)...

  4. LOS

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,s - 1 2 3 4 5 6BOE Reserve Classaccess

  5. LOS

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,s - 1 2 3 4 5 6BOE Reserve

  6. Los

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking down the road aheadchange vehicle

  7. Analyzing geographic clustered response

    SciTech Connect (OSTI)

    Merrill, D.W.; Selvin, S.; Mohr, M.S.

    1991-08-01T23:59:59.000Z

    In the study of geographic disease clusters, an alternative to traditional methods based on rates is to analyze case locations on a transformed map in which population density is everywhere equal. Although the analyst's task is thereby simplified, the specification of the density equalizing map projection (DEMP) itself is not simple and continues to be the subject of considerable research. Here a new DEMP algorithm is described, which avoids some of the difficulties of earlier approaches. The new algorithm (a) avoids illegal overlapping of transformed polygons; (b) finds the unique solution that minimizes map distortion; (c) provides constant magnification over each map polygon; (d) defines a continuous transformation over the entire map domain; (e) defines an inverse transformation; (f) can accept optional constraints such as fixed boundaries; and (g) can use commercially supported minimization software. Work is continuing to improve computing efficiency and improve the algorithm. 21 refs., 15 figs., 2 tabs.

  8. Escriba los ltimos cuatro dgitos de su nmero telefnico

    E-Print Network [OSTI]

    comparación con los granos procesados, los granos integrales: A Tienen más vitaminas, minerales y fibra B

  9. LOS ALAMOS, N.M., June 18, 2014-Los Alamos National Laboratory...

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

    June 18, 2014 Los Alamos to partner with Toshiba to remotely and safely peer inside nuclear reactors LOS ALAMOS, N.M., June 18, 2014-Los Alamos National Laboratory today...

  10. LOS ALAMOS, New Mexico, April 26, 2011-Los Alamos Middle School...

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

    top winners: Los Alamos schools April 26, 2011 LOS ALAMOS, New Mexico, April 26, 2011-Los Alamos Middle School student Cole Kendrick won the top prize in the 21st New Mexico...

  11. Intelligent choice of the number of clusters in K-Means clustering: an experimental study with different cluster spreads1

    E-Print Network [OSTI]

    Mirkin, Boris

    1 Intelligent choice of the number of clusters in K-Means clustering: an experimental study The issue of determining "the right number of clusters" in K-Means has attracted considerable interest of the cluster recovery. The subjects of our interest are two versions of the "intelligent" K-Means method, ik

  12. Cluster Selection and the Evolution of Brightest Cluster Galaxies

    E-Print Network [OSTI]

    D. J. Burke; C. A. Collins; R. G. Mann

    2000-02-08T23:59:59.000Z

    The K-band Hubble diagram of Brightest Cluster Galaxies (BCGs) is presented for a large, X-ray selected cluster sample extending out to z = 0.8. The controversy over the degree of BCG evolution is shown to be due to sample selection, since the BCG luminosity depends upon the cluster environment. Selecting only the most X-ray luminous clusters produces a BCG sample which shows, under the assumption of an Einstein-de Sitter cosmology, significantly less mass growth than that predicted by current semi-analytic galaxy formation models, and significant evidence of any growth only if the dominant stellar population of the BCGs formed relatively recently (z <= 2.6).

  13. LOS ALAMOS, New Mexico, November 1, 2011-Two Los Alamos National...

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

    engineers help New Mexico small businesses November 1, 2011 Program provides technical expertise LOS ALAMOS, New Mexico, November 1, 2011-Two Los Alamos National Laboratory...

  14. LOS ALAMOS, NEW MEXICO, August 22, 2012-Nathan Moody of Los Alamos

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

    22, 2012 - 2 - Nathan Moody, specialist in electromagnetic radiation, honored LOS ALAMOS, NEW MEXICO, August 22, 2012-Nathan Moody of Los Alamos National Laboratory is among 78 of...

  15. LOS ALAMOS, New Mexico, August 28, 2008-Physicists at Los Alamos...

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

    Magnetism and superconductivity observed to exist in harmony August 28, 2008 LOS ALAMOS, New Mexico, August 28, 2008-Physicists at Los Alamos National Laboratory, along with...

  16. LOS ALAMOS, New Mexico, January 7, 2009-Los Alamos National Laboratory...

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

    Venture Acceleration Fund recipients January 7, 2009 LOS ALAMOS, New Mexico, January 7, 2009-Los Alamos National Laboratory (LANL) has selected Retriever Technology, Elemetric...

  17. PHAT Stellar Cluster Survey. II. Andromeda Project Cluster Catalog

    E-Print Network [OSTI]

    Johnson, L Clifton; Dalcanton, Julianne J; Wallace, Matthew L; Simpson, Robert J; Lintott, Chris J; Kapadia, Amit; Skillman, Evan D; Caldwell, Nelson; Fouesneau, Morgan; Weisz, Daniel R; Williams, Benjamin F; Beerman, Lori C; Gouliermis, Dimitrios A; Sarajedini, Ata

    2015-01-01T23:59:59.000Z

    We construct a stellar cluster catalog for the Panchromatic Hubble Andromeda Treasury (PHAT) survey using image classifications collected from the Andromeda Project citizen science website. We identify 2,753 clusters and 2,270 background galaxies within ~0.5 deg$^2$ of PHAT imaging searched, or ~400 kpc$^2$ in deprojected area at the distance of the Andromeda galaxy (M31). These identifications result from 1.82 million classifications of ~20,000 individual images (totaling ~7 gigapixels) by tens of thousands of volunteers. We show that our crowd-sourced approach, which collects >80 classifications per image, provides a robust, repeatable method of cluster identification. The high spatial resolution Hubble Space Telescope images resolve individual stars in each cluster and are instrumental in the factor of ~6 increase in the number of clusters known within the survey footprint. We measure integrated photometry in six filter passbands, ranging from the near-UV to the near-IR. PHAT clusters span a range of ~8 ma...

  18. Functional Clustering in Nested Designs Abel Rodriguez

    E-Print Network [OSTI]

    West, Mike

    -spline fitting coupled with k-means clustering; Tarpey & Kinateder (2003), who apply k-means clustering via functional data that employ spline representations; Garc´ia-Escudero & Gordaliza (2005), where the robust k-means profile for each woman. #12;Functional Clustering in Nested Designs 3 with k-means clustering; Heard et al

  19. Los Alamos National Laboratory Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLookingLANL awards $753Los Alamos6

  20. Los Alamos National Laboratory Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLookingLANL awards $753Los

  1. Los Alamos National Laboratory Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLookingLANL awards $753Los14 15

  2. MODELACIN DEL TRANSPORTE REACTIVO EN LOS

    E-Print Network [OSTI]

    Politècnica de Catalunya, Universitat

    UPCUPCUPC MODELACIÓN DEL TRANSPORTE REACTIVO EN LOS YACIMIENTOS DE URANIO DE LA CUENCA DE transporte reactivo y validación #12;Contexto geológico de los yacimientos de uranio de la cuenca de

  3. Teatro Hispánico en California State, Los Angeles

    E-Print Network [OSTI]

    1983-10-01T23:59:59.000Z

    producción de los profesores Gigi Gaucher-Schultz, Alfredo Morales y Maris U. Ubans. Como en ocasiones anteriores, se podrá participar sea como actor o en los aspectos técnicos del montaje: escenografía, iluminación, sonido, vestuario, maquillaje, pub...

  4. Infrared spectroscopy of ionic clusters

    SciTech Connect (OSTI)

    Price, J.M. (California Univ., Berkeley, CA (USA). Dept. of Chemistry Lawrence Berkeley Lab., CA (USA))

    1990-11-01T23:59:59.000Z

    This thesis describes new experiments wherein the infrared vibrational predissociation spectra of a number of mass-selected ionic cluster systems have been obtained and analyzed in the 2600 to 4000 cm{sup {minus}1} region. The species studied include: the hydrated hydronium ions, H{sub 3}O{sup +} (H{sub 2}O){sub 3 {minus}10}, ammoniated ammonium ions, NH{sub 4}{sup +}(NH{sub 3}){sub 1 {minus}10} and cluster ions involving both water and ammonia around an ammonium ion core, (mixed clusters) NH{sub 4}{sup +}(NH{sub 3}){sub n}(H{sub 2}O){sub m} (n+m=4). In each case, the spectra reveal well resolved structures that can be assigned to transitions arising from the vibrational motions of both the ion core of the clusters and the surrounding neutral solvent molecules. 154 refs., 19 figs., 8 tabs.

  5. The Leadership Cluster Memorial Union

    E-Print Network [OSTI]

    Escher, Christine

    The Leadership Cluster Memorial Union Student Leadership and Involvement Student Media Something New @ OSU #12;Access Diversity "Leadership/Citizenship" Community Connection Health & Wellness Housing & Dining Administrative Leadership #12;Student Leadership & Involvement SLI-Activities Program Club

  6. Multi-source contingency clustering

    E-Print Network [OSTI]

    Bouvrie, Jacob V

    2004-01-01T23:59:59.000Z

    This thesis examines the problem of clustering multiple, related sets of data simultaneously. Given datasets which are in some way connected (e.g. temporally) but which do not necessarily share label compatibility, we ...

  7. Clusters and the Cosmic Web

    E-Print Network [OSTI]

    Rien van de Weygaert

    2006-07-24T23:59:59.000Z

    We discuss the intimate relationship between the filamentary features and the rare dense compact cluster nodes in this network, via the large scale tidal field going along with them, following the cosmic web theory developed Bond et al. The Megaparsec scale tidal shear pattern is responsible for the contraction of matter into filaments, and its link with the cluster locations can be understood through the implied quadrupolar mass distribution in which the clusters are to be found at the sites of the overdense patches. We present a new technique for tracing the cosmic web, identifying planar walls, elongated filaments and cluster nodes in the galaxy distribution. This will allow the practical exploitation of the concept of the cosmic web towards identifying and tracing the locations of the gaseous WHIM. These methods, the Delaunay Tessellation Field Estimator (DTFE) and the Morphology Multiscale Filter (MMF) find their basis in computational geometry and visualization.

  8. Dust cluster explosion

    SciTech Connect (OSTI)

    Saxena, Vikrant [School of Mathematics and Physics, Queen's University Belfast, Belfast, Northern Ireland (United Kingdom); Institute for Plasma Research, Bhat, Gandhinagar (India); Avinash, K. [Department of Physics and Astrophysics, University of Delhi, New Delhi (India); Sen, A. [Institute for Plasma Research, Bhat, Gandhinagar (India)

    2012-09-15T23:59:59.000Z

    A model for the dust cluster explosion where micron/sub-micron sized particles are accelerated at the expense of plasma thermal energy, in the afterglow phase of a complex plasma discharge is proposed. The model is tested by molecular dynamics simulations of dust particles in a confining potential. The nature of the explosion (caused by switching off the discharge) and the concomitant dust acceleration is found to depend critically on the pressure of the background neutral gas. At low gas pressure, the explosion is due to unshielded Coulomb repulsion between dust particles and yields maximum acceleration, while in the high pressure regime it is due to shielded Yukawa repulsion and yields much feebler acceleration. These results are in agreement with experimental findings. Our simulations also confirm a recently proposed electrostatic (ES) isothermal scaling relation, P{sub E}{proportional_to}V{sub d}{sup -2} (where P{sub E} is the ES pressure of the dust particles and V{sub d} is the confining volume).

  9. Adhesive Gravitational Clustering

    E-Print Network [OSTI]

    Thomas Buchert; Alvaro Dominguez

    2005-06-21T23:59:59.000Z

    The notion of `adhesion' has been advanced for the phenomenon of stabilization of large-scale structure emerging from gravitational instability of a cold medium. Recently, the physical origin of adhesion has been identified: a systematic derivation of the equations of motion for the density and the velocity fields leads naturally to the key equation of the `adhesion approximation' - however, under a set of strongly simplifying assumptions. In this work, we provide an evaluation of the current status of adhesive gravitational clustering and a clear explanation of the assumptions involved. Furthermore, we propose systematic generalizations with the aim to relax some of the simplifying assumptions. We start from the general Newtonian evolution equations for self-gravitating particles on an expanding Friedmann background and recover the popular `dust model' (pressureless fluid), which breaks down after the formation of density singularities; then we investigate, in a unified framework, two other models which, under the restrictions referred to above, lead to the `adhesion approximation'. We apply the Eulerian and Lagrangian perturbative expansions to these new models and, finally, we discuss some non-perturbative results that may serve as starting points for workable approximations of non-linear structure formation in the multi-stream regime. In particular, we propose a new approximation that includes, in limiting cases, the standard `adhesion model' and the Eulerian as well as Lagrangian first-order approximations.

  10. El Inventario Cientfico de los Recursos Naturales,

    E-Print Network [OSTI]

    Gilbes, Fernando

    El Inventario Científico de los Recursos Naturales, Ambientales y Culturales de Puerto Rico Nitza Ambientales #12;¿Qué es el Inventario? Presiones sobre los recursos naturales soluciones rápidas y efectivas Inventario de todos los recursos naturales Ley 158 del 28 de junio del 1968 Se basa en método científico de

  11. INTEGRAL observations of Galaxy Clusters

    E-Print Network [OSTI]

    Goldoni, P; Laurent, P; Cassé, M; Paul, J; Sarazin, C L

    2000-01-01T23:59:59.000Z

    Cluster of galaxies are the largest concentrations of visible mass in the Universe and therefore a fundamental topic of cosmology and astrophysics. Recent radio, EUV, and X-ray observations suggest that clusters contain large populations of diffuse nonthermal relativistic and/or superthermal particles. These particles may be produced by acceleration in cluster merger shocks, AGNs, and/or supernovae in cluster galaxies. Models for the nonthermal populations in clusters indicate that they should produce substantial hard X-ray and $\\gamma$ luminosities. The possible role of nonthermal particles in the dynamics of clusters is one of the greatest uncertainties in their use as cosmological probes. INTEGRAL offers, for the first time, the possibility of simultaneous medium resolution imaging (~ 12 arcmin) and high resolution spectroscopy (DeltaE/E ~ 2 keV @ 1.3 MeV) with exceptional sensitivity in the hard X-ray/soft gamma-ray band. The spatial resolution will allow discrete sources, such as AGNs, to be separated fr...

  12. Cosmography with cluster strong lensing

    E-Print Network [OSTI]

    James Gilmore; Priyamvada Natarajan

    2009-05-29T23:59:59.000Z

    By stacking an ensemble of strong lensing clusters, we demonstrate the feasibility of placing constraints on the dark energy equation of state. This is achieved by using multiple images of sources at two or more distinct redshift planes. The sample of smooth clusters in our simulations is based on observations of massive clusters and the distribution of background galaxies is constructed using the Hubble Deep Field. Our source distribution reproduces the observed redshift distribution of multiply imaged sources in Abell 1689. The cosmology recovery depends on the number of image families with known spectroscopic redshifts and the number of stacked clusters. Our simulations suggest that constraints comparable to those derived from other competing established techniques on a constant dark energy equation of state can be obtained using 10 to 40 clusters with 5 or more families of multiple images. We have also studied the observational errors in the image redshifts and positions. We find that spectroscopic redshifts and high resolution {\\it Hubble Space Telescope} images are required to eliminate confidence contour relaxation relative to the ideal case in our simulations. This suggests that the dark energy equation of state, and other cosmological parameters, can be constrained with existing {\\it Hubble Space Telescope} images of lensing clusters coupled with dedicated ground-based arc spectroscopy.

  13. Internal gettering by metal alloy clusters

    DOE Patents [OSTI]

    Buonassisi, Anthony (San Diego, CA); Heuer, Matthias (Berkeley, CA); Istratov, Andrei A. (Albany, CA); Pickett, Matthew D. (Berkeley, CA); Marcus, Mathew A. (Berkeley, CA); Weber, Eicke R. (Piedmont, CA)

    2010-07-27T23:59:59.000Z

    The present invention relates to the internal gettering of impurities in semiconductors by metal alloy clusters. In particular, intermetallic clusters are formed within silicon, such clusters containing two or more transition metal species. Such clusters have melting temperatures below that of the host material and are shown to be particularly effective in gettering impurities within the silicon and collecting them into isolated, less harmful locations. Novel compositions for some of the metal alloy clusters are also described.

  14. Some Remarks on Extragalactic Globular Clusters

    E-Print Network [OSTI]

    Tom Richtler

    2005-12-21T23:59:59.000Z

    I comment (in a review fashion) on a few selected topics in the field of extragalactic globular clusters with strong emphasis on recent work. The topics are: bimodality in the colour distribution of cluster systems, young massive clusters, and the brightest old clusters. Globular cluster research, perhaps more than ever, has lead to important (at least to astronomers) progress and problems in galaxy structure and formation.

  15. Los Alamos Employee Giving Campaign

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLooking northeast overSchoolLos

  16. Los Alamos National Laboratory Institutes

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLookingLANL awards $753Los Alamos

  17. Upper Los Alamos Canyon Cleanup

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrinceton PlasmaAfternoon TalksDigitalRevisionof EnergyUpper Los

  18. Los Alamos, Sandia National labs

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8, 2014addsAlamos,

  19. Reconocer los derechos de los migrantes para fortalecer la integracin regional

    E-Print Network [OSTI]

    Richner, Heinz

    sujeto en la vida económica, política y social de los países de la región debe hacer que los gobiernos revisen los enfoques tradicionales y entiendan las migraciones como una nueva dimensión de la vida social su derecho al trabajo. ·El bienestar de las personas migrantes requiere que el Estado y los

  20. Los Alamos Dynamics Summer School-Past Programs

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

    Los Alamos Dynamics Summer School Los Alamos Dynamics Summer School Projects and Resources 2015 Los Alamos Dynamics Summer School Projects and Resources Contact Institute Director...

  1. KEYWORDS: geospatial clustering, web service, Web GIS, spatial data mining, clustering 1 INTRODUCTION

    E-Print Network [OSTI]

    1 KEYWORDS: geospatial clustering, web service, Web GIS, spatial data mining, clustering 1 in disease surveillance, spatial epidemiology, population genetics, landscape ecology, crime analysis

  2. Ionization of Water Clusters is Mediated by Exciton Energy Transfer from Argon Clusters

    SciTech Connect (OSTI)

    Golan, Amir; Ahmed, Musahid

    2012-01-25T23:59:59.000Z

    The exciton energy deposited in an argon cluster, (Arn ,< n=20>) using VUV radiation is transferred to softly ionize doped water clusters, ((H2O)n, n=1-9) leading to the formation of non-fragmented clusters. Following the initial excitation, electronic energy is channeled to ionize the doped water cluster while evaporating the Ar shell, allowing identification of fragmented and complete water cluster ions. Examination of the photoionization efficiency curve shows that cluster evaporation from excitons located above 12.6 eV are not enough to cool the energized water cluster ion, and leads to their dissociation to (H2O)n-2H+ (protonated) clusters.

  3. Bayesian Model Based Clustering Procedures John W. Lau

    E-Print Network [OSTI]

    Green, Peter

    of classical approaches, such as hierarchical clustering and K-means clustering procedures, Bayesian a comparison of the statistical performance of the (approximate) optimal clustering with earlier methods

  4. AGN Physics from QSO Clustering

    E-Print Network [OSTI]

    Scott Croom; Brian Boyle; Tom Shanks; Phil Outram; Robert Smith; Lance Miller; Nicola Loaring; Suzanne Kenyon; Warrick Couch

    2003-10-20T23:59:59.000Z

    We review the current status of QSO clustering measurements, particular with respect to their relevance in understanding AGN physics. Measurements based on the 2dF QSO Redshift Survey (2QZ) find a scale length for QSO clustering of s_0=5.76(+0.17-0.27) h-1 Mpc at a redshift ~1.5, very similar to low redshift galaxies. There is no evidence of evolution in the clustering of QSOs from z~0.5 to z~2.2. This lack of evolution and low clustering amplitude suggests a short life time for AGN activity of the order ~10^6-10^7 years. Large surveys such at the 2QZ and SDSS also allow the the study of QSO environments in 3D for the first time (at least at low redshift), early results from this work seem to show no difference between the environments of QSOs and normal galaxies. Future studies e.g. measuring clustering as a function of black hole mass, and deep QSO surveys should provide further insight into the formation and evolution of AGN.

  5. Confirming EIS Clusters. Optical and Infrared Imaging

    E-Print Network [OSTI]

    L. F. Olsen; H. E. Jorgensen; M. Scodeggio; L. da Costa; R. Rengelink; M. Nonino; A. Biviano; M. Ramella; W. Boschin

    1999-10-25T23:59:59.000Z

    Clusters of galaxies are important targets in observationally cosmology, as they can be used both to study the evolution of the galaxies themselves and to constrain cosmological parameters. Here we report on the first results of a major effort to build up a sample of distant galaxy clusters to form the basis for further studies within those fields. We search for simultaneous overdensities in color and space to obtain supporting evidence for the reality of the clusters. We find a confirmation rate for EIS clusters of 66%, suggesting that a total of about 80 clusters with z>=0.6 are within reach using the EIS cluster candidates.

  6. Nuclear Star Clusters and Bulges

    E-Print Network [OSTI]

    Cole, David R

    2015-01-01T23:59:59.000Z

    Nuclear star clusters are among the densest stellar systems known and are common in both early- and late-type galaxies. They exhibit scaling relations with their host galaxy which may be related to those of supermassive black holes. These may therefore help us to unravel the complex physical processes occurring at the centres of galaxies. The properties of nuclear stellar systems suggest that their formation requires both dissipational and dissipationless processes. They have stellar populations of different ages, from stars as old as their host galaxy to young stars formed in the last 100 Myr. Therefore star formation must be happening either directly in the nuclear star cluster or in its vicinity. The secular processes that fuel the formation of pseudobulges very likely also contributes to nuclear star cluster growth.

  7. Are Cluster Magnetic Fields Primordial ?

    E-Print Network [OSTI]

    Robi Banerjee; Karsten Jedamzik

    2004-09-07T23:59:59.000Z

    We present results of a detailed and fully non-linear numerical and analytical investigation of magnetic field evolution from the very earliest cosmic epochs to the present. We find that, under reasonable assumptions concerning the efficiency of a putative magnetogenesis era during cosmic phase transitions, surprisingly strong magnetic fields 10^{-13} - 10^{-11} Gauss, on comparatively small scales 100 pc - 10 kpc may survive to the present. Building on prior work on the evolution of magnetic fields during the course of gravitational collapse of a cluster, which indicates that pre-collapse fields of 4\\times 10^{-12} Gauss extant on small scales may suffice to produce clusters with acceptable Faraday rotation measures, we question the widely hold view that cluster magnetic fields may not be entirely of primordial origin.

  8. Brightest Cluster Galaxies in the Extended GMRT radio halo cluster sample. Radio properties and cluster dynamics

    E-Print Network [OSTI]

    Kale, Ruta; Cassano, Rossella; Giacintucci, Simona; Bardelli, sandro; Dallacasa, Daniele; Zucca, Elena

    2015-01-01T23:59:59.000Z

    Brightest Cluster Galaxies (BCGs) show exceptional properties over the whole electromagnetic spectrum. Their special location at the centres of galaxy clusters raises the question of the role of the environment on their radio properties. To decouple the effect of the galaxy mass and of the environment in their statistical radio properties, we investigate the possible dependence of the occurrence of radio loudness and of the fractional radio luminosity function on the dynamical state of the hosting cluster. We studied the radio properties of the BCGs in the Extended GMRT Radio Halo Survey (EGRHS). We obtained a statistical sample of 59 BCGs, which was divided into two classes, depending on the dynamical state of the host cluster, i.e. merging (M) and relaxed (R). Among the 59 BCGs, 28 are radio-loud, and 31 are radio--quiet. The radio-loud sources are located favourably located in relaxed clusters (71\\%), while the reverse is true for the radio-quiet BCGs, mostly located in merging systems (81\\%). The fraction...

  9. The Herschel Virgo Cluster Survey XVI: a cluster inventory

    E-Print Network [OSTI]

    Davies, J I; Baes, M; Bendo, G J; Clemens, M; De Looze, I; Alighieri, S di Serego; Fritz, J; Fuller, C; Pappalardo, C; Hughes, T M; Madden, S; Smith, M W L; Verstappen, J; Vlahakis, C

    2013-01-01T23:59:59.000Z

    Herschel FIR observations are used to construct Virgo cluster galaxy luminosity functions and to show that the cluster lacks the very bright and the numerous faint sources detected in field galaxy surveys. The far-infrared SEDs are fitted to obtain dust masses and temperatures and the dust mass function. The cluster is over dense in dust by about a factor of 100 compared to the field. The same emissivity (beta) temperature relation applies for different galaxies as that found for different regions of M31. We use optical and HI data to show that Virgo is over dense in stars and atomic gas by about a factor of 100 and 20 respectively. Metallicity values are used to measure the mass of metals in the gas phase. The mean metallicity is about 0.7 solar and 50% of the metals are in the dust. For the cluster as a whole the mass density of stars in galaxies is 8 times that of the gas and the gas mass density is 130 times that of the metals. We use our data to consider the chemical evolution of the individual galaxies,...

  10. How Many Clusters? Which Clustering Method? Answers Via

    E-Print Network [OSTI]

    Raftery, Adrian

    much more closely than single-link (nearest-neighbour) or standard k-means, in the absence of any on the Bayesian information criterion (BIC); unlike significance tests, this allows comparison of more than two a clustering methodology based on multivariate normal mixtures in which the BIC is used for direct comparison

  11. CRAD, Maintenance - Los Alamos National Laboratory Waste Characterizat...

    Office of Environmental Management (EM)

    Maintenance - Los Alamos National Laboratory Waste Characterization, Reduction, and Repackaging Facility CRAD, Maintenance - Los Alamos National Laboratory Waste Characterization,...

  12. CRAD, Training - Los Alamos National Laboratory Waste Characterization...

    Office of Environmental Management (EM)

    Training - Los Alamos National Laboratory Waste Characterization, Reduction, and Repackaging Facility CRAD, Training - Los Alamos National Laboratory Waste Characterization,...

  13. CRAD, Safety Basis - Los Alamos National Laboratory Waste Characteriza...

    Office of Environmental Management (EM)

    Safety Basis - Los Alamos National Laboratory Waste Characterization, Reduction, and Repackaging Facility CRAD, Safety Basis - Los Alamos National Laboratory Waste...

  14. Perspectives for logistics clusters development in Russia

    E-Print Network [OSTI]

    Tantsuyev, Andriy

    2012-01-01T23:59:59.000Z

    This thesis is a normative work aimed at identifying locations in Russia with high, medium and unclear potentials for logistics cluster development. As a framework this work uses four different models of logistics clusters: ...

  15. Agglomerative Clustering via Maximum Incremental Path Integral

    E-Print Network [OSTI]

    Wang, Xiaogang

    clusters into small ones. Numerous algorithms have been proposed, such as k-means [2], spectral clustering of the algorithm based on absorbing random walk is provided. Experimental comparison on toy data and imagery data

  16. Performance Characterization of Clustering Algorithms for Colour Image Segmentation

    E-Print Network [OSTI]

    Whelan, Paul F.

    techniques (K-Means clustering, Fuzzy C- Means clustering and Adaptive K-Means clustering) that are applied algorithms: K-Means, Fuzzy C-Means and Adaptive K-Means (also called clustering by competitive agglomeration

  17. PageRank Based Clustering of Hypertext Document Collections

    E-Print Network [OSTI]

    Avrachenkov, Konstantin

    are K-means clustering, Informa- tion Bottleneck based clustering and Contextual Document Clustering with high modularity and coverage. The comparison of the PRC algorithm with two content based clustering

  18. Independent Oversight Review, Los Alamos National Laboratory...

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

    2011 December 2011 Review of the Independent Integrated Safety ManagementIntegrated Work Management Assessment of Research and Development and Programmatic Work at the Los...

  19. Los Alamos Space Weather Summer School

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

    and instrumentation. Our top sponsors this year include the Los Alamos Institute of Geophysics, Planetary Physics and Signatures (IGPPS) and the Laboratory Directed Research and...

  20. A different Big Bang theory: Los Alamos

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

    different Big Bang theory: Los Alamos unveils explosives detection expertise February 19, 2015 Collaboration project defeats explosives threats through enhanced detection...

  1. Oversight Reports - Los Alamos National Laboratory | Department...

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

    May 2011 Safety System Oversight Assessment of the Los Alamos National Laboratory Weapons Engineering Tritium Facility Tritium Gas Handling System February 8, 2011 Independent...

  2. Independent Oversight Review, Los Alamos National Laboratory...

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

    conducted an independent review of the Los Alamos National Laboratory (LANL) Weapons Engineering Tritium Facility (WETF) safety significant Tritium Gas Containment System...

  3. Enterprise Assessments Review, Los Alamos National Laboratory...

    Energy Savers [EERE]

    - November 2014 November 2014 Review of the Los Alamos National Laboratory Weapons Engineering Tritium Facility Fire Suppression System The Department of Energy Office of...

  4. Los Alamos plants willows for flood recovery

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

    plants willows Los Alamos plants willows for flood recovery The Laboratory's Corrective Actions Program (CAP) planted nearly 10,000 willows to help preserve the Pueblo Canyon...

  5. Los Alamos research and leadership prizes awarded

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

    Research and leadership prizes awarded Los Alamos research and leadership prizes awarded Commendations for exemplary scientific research and leadership have been bestowed upon...

  6. Los Alamos wins 2008 Pollution Prevention awards

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

    2008 Pollution Prevention awards Los Alamos wins 2008 Pollution Prevention awards Winner of two Best-in-Class Pollution Prevention awards and six Environmental Stewardship awards...

  7. High-Performance Computing at Los

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

    and back to the loosened semantics of key value stores," says Gary Grider, High Performance Computing division leader at Los Alamos. Computer simulations overall are scaling to...

  8. Independent Oversight Review, Los Alamos National Laboratory...

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

    January 2012 Review of the Los Alamos National Laboratory Chemistry and Metallurgy Research Facility Fire Suppression Vital Safety System This report provides the results of an...

  9. Independent Oversight Assessment, Los Alamos National Laboratory...

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

    of Nuclear Safety Culture at the Los Alamos National Laboratory Chemistry and Metallurgy Research Replacement Project This report provides the results of an independent...

  10. An Equal Opportunity Employer / Operated by Los Alamos National Security LLC for DOE/NNSA Los Alamos Postdoc Program Office

    E-Print Network [OSTI]

    An Equal Opportunity Employer / Operated by Los Alamos National Security LLC for DOE/NNSA Los Opportunity Employer / Operated by Los Alamos National Security LLC for DOE/NNSA The Los Alamos Postdoc

  11. Cluster Dynamics in a Circulating Fluidized Bed

    SciTech Connect (OSTI)

    Guenther, C.P.; Breault, R.W.

    2006-11-01T23:59:59.000Z

    A common hydrodynamic feature in industrial scale circulating fluidized beds is the presence of clusters. The continuous formation and destruction of clusters strongly influences particle hold-up, pressure drop, heat transfer at the wall, and mixing. In this paper fiber optic data is analyzed using discrete wavelet analysis to characterize the dynamic behavior of clusters. Five radial positions at three different axial locations under five different operating were analyzed using discrete wavelets. Results are summarized with respect to cluster size and frequency.

  12. EA-2005: Chromium Plume Control Interim Measure And Plume-Center Characterization, Los Alamos National Laboratory, Los Alamos, NM

    Broader source: Energy.gov [DOE]

    EA-2005: Chromium Plume Control Interim Measure And Plume-Center Characterization, Los Alamos National Laboratory, Los Alamos, NM

  13. An Improved Cluster Richness Estimator

    SciTech Connect (OSTI)

    Rozo, Eduardo; /Ohio State U.; Rykoff, Eli S.; /UC, Santa Barbara; Koester, Benjamin P.; /Chicago U. /KICP, Chicago; McKay, Timothy; /Michigan U.; Hao, Jiangang; /Michigan U.; Evrard, August; /Michigan U.; Wechsler, Risa H.; /SLAC; Hansen, Sarah; /Chicago U. /KICP, Chicago; Sheldon, Erin; /New York U.; Johnston, David; /Houston U.; Becker, Matthew R.; /Chicago U. /KICP, Chicago; Annis, James T.; /Fermilab; Bleem, Lindsey; /Chicago U.; Scranton, Ryan; /Pittsburgh U.

    2009-08-03T23:59:59.000Z

    Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its performance using the maxBCG cluster catalog. Our new estimator significantly reduces the variance in the L{sub X}-richness relation, from {sigma}{sub lnL{sub X}}{sup 2} = (0.86 {+-} 0.02){sup 2} to {sigma}{sub lnL{sub X}}{sup 2} = (0.69 {+-} 0.02){sup 2}. Relative to the maxBCG richness estimate, it also removes the strong redshift dependence of the richness scaling relations, and is significantly more robust to photometric and redshift errors. These improvements are largely due to our more sophisticated treatment of galaxy color data. We also demonstrate the scatter in the L{sub X}-richness relation depends on the aperture used to estimate cluster richness, and introduce a novel approach for optimizing said aperture which can be easily generalized to other mass tracers.

  14. DESIGN OF CLUSTERED SUPERSCALAR MICROARCHITECTURES

    E-Print Network [OSTI]

    Parcerisa, Joan-Manuel

    DESIGN OF CLUSTERED SUPERSCALAR MICROARCHITECTURES Joan-Manuel Parcerisa Departament d'Arquitectura SUPERSCALAR MICROARCHITECTURES Joan-Manuel Parcerisa Departament d'Arquitectura de Computadors Universitat après tantes coses sobre l'ofici de la recerca, i sobre l'arquitectura de computadors al llarg d

  15. COSMOS Cluster 3 Summer 2010

    E-Print Network [OSTI]

    Russell, Lynn

    COSMOS Cluster 3 Summer 2010 Clouds in a Glass of Root Beer Instructor: Prof. Lynn Russell Teaching and Physics J.H. Seinfeld and S.N. Pandis, 1997 Clouds in a Glass of Beer: Simple Experiments in Atmospheric) to observe the difference in carbonation of water and root beer 2) to form clouds in root beer using

  16. Gravitational `Convergence' and Cluster Masses

    E-Print Network [OSTI]

    Tom Broadhurst

    1995-12-01T23:59:59.000Z

    Two colour photometry of the cluster A1689 reveals a `relative magnification-bias' between lensed blue and red background galaxies, arising from a dependence of the faint galaxy count-slope on colour. The colour distribution is skewed blueward of the far field, allowing us to measure the cluster magnification and to understand the notorious blueness of large arcs. We show that the magnification information can be combined with the usual image distortion measurements to isolate the local `convergence' component of lensing and hence derive the projected mass. This is achieved through a simple local relation between the convergence and the observables, which can be applied generally over the surface a cluster. In the weak lensing limit, the convergence reduces to a dependence on the magnification alone, so that in the outskirts of clusters the surface-density of matter is obtained directly from the surface-density of background galaxies. Hence, useful lensing work requires colour information but not necessarily good seeing. Interestingly, convergence varies slowly at high redshift, saturating at a level depending on the Horizon distance, allowing a useful model-independent measurement of the Global Geometry.

  17. Cold Fronts in CDM clusters

    E-Print Network [OSTI]

    Daisuke Nagai; Andrey V. Kravtsov

    2003-01-08T23:59:59.000Z

    Recently, high-resolution Chandra observations revealed the existence of very sharp features in the X-ray surface brightness and temperature maps of several clusters (Vikhlinin et. al., 2001). These features, called ``cold fronts'', are characterized by an increase in surface brightness by a factor >2 over 10-50 kpc, accompanied by a drop in temperature of a similar magnitude. The existence of such sharp gradients can be used to put interesting constraints on the physics of the intracluster medium (ICM), if their mechanism and longevity are well understood. Here, we present results of a search for cold fronts in high-resolution simulations of galaxy clusters in cold dark matter (CDM) models. We show that sharp gradients with properties similar to those of observed cold fronts naturally arise in cluster mergers when the shocks heat gas surrounding the merging sub-cluster, while its dense core remains relatively cold. The compression induced by supersonic motions and shock heating during the merger enhance the amplitude of gas density and temperature gradients across the front. Our results indicate that cold fronts are non-equilibrium transient phenomena and can be observed for a period of less than a billion years. We show that the velocity and density fields of gas surrounding the cold front can be very irregular which would complicate analyses aiming to put constraints on the physical conditions of the intracluster medium in the vicinity of the front.

  18. Modeling the Energy Efficiency of Heterogeneous Clusters

    E-Print Network [OSTI]

    Teo, Yong-Meng

    are an alternative for energy-efficient clusters [18], [20], [23]. On the contrary, other researchersModeling the Energy Efficiency of Heterogeneous Clusters Lavanya Ramapantulu, Bogdan Marius Tudor analyze the energy efficiency of mixing high-performance and low-power nodes in a cluster. Using a model

  19. Clustering with the Fisher Score Koji Tsuda,

    E-Print Network [OSTI]

    clustering with the Fisher score, K-Means type methods are obviously inappropriate because they make use such as biological sequences [2] are especially challenging, because efficient clustering algorithms e.g. K-Means [6 of unnecessary nuisance dimensions. So K-Means type clustering [6] is obviously inappropriate because it takes

  20. A GMBCG galaxy cluster catalog of 55,880 rich clusters from SDSS DR7

    SciTech Connect (OSTI)

    Hao, Jiangang; McKay, Timothy A.; Koester, Benjamin P.; Rykoff, Eli S.; Rozo, Eduardo; Annis, James; Wechsler, Risa H.; Evrard, August; Siegel, Seth R.; Becker, Matthew; Busha, Michael; /Fermilab /Michigan U. /Chicago U., Astron. Astrophys. Ctr. /UC, Santa Barbara /KICP, Chicago /KIPAC, Menlo Park /SLAC /Caltech /Brookhaven

    2010-08-01T23:59:59.000Z

    We present a large catalog of optically selected galaxy clusters from the application of a new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data. The algorithm detects clusters by identifying the red sequence plus Brightest Cluster Galaxy (BCG) feature, which is unique for galaxy clusters and does not exist among field galaxies. Red sequence clustering in color space is detected using an Error Corrected Gaussian Mixture Model. We run GMBCG on 8240 square degrees of photometric data from SDSS DR7 to assemble the largest ever optical galaxy cluster catalog, consisting of over 55,000 rich clusters across the redshift range from 0.1 < z < 0.55. We present Monte Carlo tests of completeness and purity and perform cross-matching with X-ray clusters and with the maxBCG sample at low redshift. These tests indicate high completeness and purity across the full redshift range for clusters with 15 or more members.

  1. A GMBCG Galaxy Cluster Catalog of 55,424 Rich Clusters from SDSS DR7

    SciTech Connect (OSTI)

    Hao, Jiangang; /Fermilab; McKay, Timothy A.; /Michigan U.; Koester, Benjamin P.; /Chicago U.; Rykoff, Eli S.; /UC, Santa Barbara /LBL, Berkeley; Rozo, Eduardo; /Chicago U.; Annis, James; /Fermilab; Wechsler, Risa H.; /SLAC; Evrard, August; /Michigan U.; Siegel, Seth R.; /Michigan U.; Becker, Matthew; /Chicago U.; Busha, Michael; /SLAC; Gerdes, David; /Michigan U.; Johnston, David E.; /Fermilab; Sheldon, Erin; /Brookhaven

    2011-08-22T23:59:59.000Z

    We present a large catalog of optically selected galaxy clusters from the application of a new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data. The algorithm detects clusters by identifying the red sequence plus Brightest Cluster Galaxy (BCG) feature, which is unique for galaxy clusters and does not exist among field galaxies. Red sequence clustering in color space is detected using an Error Corrected Gaussian Mixture Model. We run GMBCG on 8240 square degrees of photometric data from SDSS DR7 to assemble the largest ever optical galaxy cluster catalog, consisting of over 55,000 rich clusters across the redshift range from 0.1 < z < 0.55. We present Monte Carlo tests of completeness and purity and perform cross-matching with X-ray clusters and with the maxBCG sample at low redshift. These tests indicate high completeness and purity across the full redshift range for clusters with 15 or more members.

  2. LOS ALAMOS, New Mexico, June 4, 2013-Los Alamos National Laboratory...

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

    catalyst could jumpstart e- cars, green energy June 4, 2013 Economical non-precious-metal catalyst capitalizes on carbon nanotubes LOS ALAMOS, New Mexico, June 4, 2013-Los Alamos...

  3. EA-1156: Effluent Reduction Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts for the proposal to eliminate industrial effluent from 27 outfalls at the U.S. Department of Energy Los Alamos National Laboratory in Los Alamos, New...

  4. EIS-0238: Continued Operation of the Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EIS evaluates the potential environmental impacts of a proposal to continue operating the Los Alamos National Laboratory (LANL) located in Los Alamos County, in north-central New Mexico. DOE...

  5. LOS ALAMOS, New Mexico, April 12, 2011-Los Alamos National Laboratory...

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

    work April 12, 2011 Subcontract worth up to 80 million over five years LOS ALAMOS, New Mexico, April 12, 2011-Los Alamos National Laboratory today announced it has selected two...

  6. Theme, Characterization and Structure in Los invasores

    E-Print Network [OSTI]

    Chrzanowski, Joseph

    1978-04-01T23:59:59.000Z

    is reminiscent of Wolffs previous portrayal of him as a hypocrite: "Les he dado salario y ellos han comido. . . . Una vez tomé a los 200 con sus crios y paquetes y los trasladé a la playa. . . . Esa es mi creación: ¡hacer vidas!" (p. 124). As Meyer concludes...

  7. Mobile workstation for decontamination and decommissioning operations

    SciTech Connect (OSTI)

    Whittaker, W.L.; Osborn, J.F.; Thompson, B.R. [Carnegie-Mellon Univ., Pittsburgh, PA (United States). Robotics Inst.

    1993-10-01T23:59:59.000Z

    This project is an interdisciplinary effort to develop effective mobile worksystems for decontamination and decommissioning (D&D) of facilities within the DOE Nuclear Weapons Complex. These mobile worksystems will be configured to operate within the environmental and logistical constraints of such facilities and to perform a number of work tasks. Our program is designed to produce a mobile worksystem with capabilities and features that are matched to the particular needs of D&D work by evolving the design through a series of technological developments, performance tests and evaluations. The project has three phases. In this the first phase, an existing teleoperated worksystem, the Remote Work Vehicle (developed for use in the Three Mile Island Unit 2 Reactor Building basement), was enhanced for telerobotic performance of several D&D operations. Its ability to perform these operations was then assessed through a series of tests in a mockup facility that contained generic structures and equipment similar to those that D&D work machines will encounter in DOE facilities. Building upon the knowledge gained through those tests and evaluations, a next generation mobile worksystem, the RWV II, and a more advanced controller will be designed, integrated and tested in the second phase, which is scheduled for completion in January 1995. The third phase of the project will involve testing of the RWV II in the real DOE facility.

  8. Energy consumption of personal computer workstations

    SciTech Connect (OSTI)

    Szydlowski, R.F.; Chvala, W.D. Jr.

    1994-02-01T23:59:59.000Z

    The explosive growth of the information age has had a profound effect on the appearance of today`s office. Although the telephone still remains an important part of the information exchange and processing system within an office, other electronic devices are now considered required equipment within this environment. This office automation equipment includes facsimile machines, photocopiers, personal computers, printers, modems, and other peripherals. A recent estimate of the installed base indicated that 42 million personal computers and 7.3 million printers are in place, consuming 18.2 billion kWh/yr-and this installed base is growing (Luhn 1992). From a productivity standpoint, it can be argued that this equipment greatly improves the efficiency of those working in the office. But of primary concern to energy system designers, building managers, and electric utilities is the fact that this equipment requires electric energy. Although the impact of each incremental piece of equipment is small, installation of thousands of devices per building has resulted in office automation equipment becoming the major contributor to electric consumption and demand growth in commercial buildings. Personal computers and associated equipment are the dominant part of office automation equipment. In some cases, this electric demand growth has caused office buildings electric and cooling systems to overload.

  9. Dell PrecisionTM Mobile Workstation

    E-Print Network [OSTI]

    Fiebig, Peter

    a combination of bundled best practices and tailored solutions that work together to provide maximum value rigorous testing, Dell also targets flawless compatibility and optimized performance in demanding work;Dell is not responsible for errors in typography or photography. Dell, the Dell logo and Express

  10. Dell PrecisionTM Mobile Workstation

    E-Print Network [OSTI]

    Fiebig, Peter

    a combination of bundled best practices and tailored solutions that work together to provide maximum value rigorous testing, Dell also targets flawless compatibility and optimized performance in demanding work is not responsible for errors in typography or photography. Dell, the Dell logo and ExpressCharge are trademarks

  11. A Workstation Architecture to Support Multimedia

    E-Print Network [OSTI]

    Haddadi, Hamed

    or any other qualification at any other university. No part of this dissertation has already been, or is being currently submitted for any such degree, diploma or other qualification. Trademarks Alpha AXP, DECStation and TURBOchannel are trademarks of Digital Equipment Corporation. Ethernet is a trademark

  12. Periodic Cluster Mutations and Related Integrable Maps

    E-Print Network [OSTI]

    Allan P Fordy

    2014-03-31T23:59:59.000Z

    One of the remarkable properties of cluster algebras is that any cluster, obtained from a sequence of mutations from an initial cluster, can be written as a Laurent polynomial in the initial cluster (known as the "Laurent phenomenon"). There are many nonlinear recurrences which exhibit the Laurent phenomenon and thus unexpectedly generate integer sequences. The mutation of a typical quiver will not generate a recurrence, but rather an erratic sequence of exchange relations. How do we "design" a quiver which gives rise to a given recurrence? A key role is played by the concept of "periodic cluster mutation", introduced in 2009. Each recurrence corresponds to a finite dimensional map. In the context of cluster mutations, these are called "cluster maps". What properties do cluster maps have? Are they integrable in some standard sense? In this review I describe how integrable maps arise in the context of cluster mutations. I first explain the concept of "periodic cluster mutation", giving some classification results. I then give a review of what is meant by an integrable map and apply this to cluster maps. Two classes of integrable maps are related to interesting monodromy problems, which generate interesting Poisson algebras of functions, used to prove complete integrability and a linearisation. A connections to the Hirota-Miwa equation is explained.

  13. The APM/Matched-Filter Cluster Catalog

    E-Print Network [OSTI]

    Wataru Kawasaki

    1999-12-15T23:59:59.000Z

    A catalog of nearby clusters in the 5800 deg$^2$ area in the southern Galactic cap is constructed by applying a matched-filter cluster-finding algorithm to the sample of 3.3 million galaxies from the APM Galaxy Survey. I have preliminarily detected more than 4000 cluster candidates with estimated redshift of less than 0.2 and with richness similar to those of ACO clusters. Generally, a good correspondence is found between the nearest cluster candidates in our catalog and the ACO clusters which have measured redshift. While the ACO catalog becomes incomplete at z>0.08, the completeness limit of our cluster catalog reaches z=0.15.

  14. Cluster synchronization induced by one-node clusters in networks with asymmetric negative couplings

    SciTech Connect (OSTI)

    Zhang, Jianbao [School of Science, Hangzhou Dianzi University, Hangzhou 310018 (China)] [School of Science, Hangzhou Dianzi University, Hangzhou 310018 (China); Ma, Zhongjun, E-mail: mzj1234402@163.com [School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin 541004 (China)] [School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin 541004 (China); Zhang, Gang [College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024 (China)] [College of Mathematics and Information Science, Hebei Normal University, Shijiazhuang 050024 (China)

    2013-12-15T23:59:59.000Z

    This paper deals with the problem of cluster synchronization in networks with asymmetric negative couplings. By decomposing the coupling matrix into three matrices, and employing Lyapunov function method, sufficient conditions are derived for cluster synchronization. The conditions show that the couplings of multi-node clusters from one-node clusters have beneficial effects on cluster synchronization. Based on the effects of the one-node clusters, an effective and universal control scheme is put forward for the first time. The obtained results may help us better understand the relation between cluster synchronization and cluster structures of the networks. The validity of the control scheme is confirmed through two numerical simulations, in a network with no cluster structure and in a scale-free network.

  15. Continuous Variable Cluster State Generation over the Optical Spatial Mode Comb

    E-Print Network [OSTI]

    Raphael Pooser; Jietai Jing

    2014-12-30T23:59:59.000Z

    One way quantum computing uses single qubit projective measurements performed on a cluster state (a highly entangled state of multiple qubits) in order to enact quantum gates. The model is promising due to its potential scalability; the cluster state may be produced at the beginning of the computation and operated on over time. Continuous variables (CV) offer another potential benefit in the form of deterministic entanglement generation. This determinism can lead to robust cluster states and scalable quantum computation. Recent demonstrations of CV cluster states have made great strides on the path to scalability utilizing either time or frequency multiplexing in optical parametric oscillators (OPO) both above and below threshold. The techniques relied on a combination of entangling operators and beam splitter transformations. Here we show that an analogous transformation exists for amplifiers with Gaussian inputs states operating on multiple spatial modes. By judicious selection of local oscillators (LOs), the spatial mode distribution is analogous to the optical frequency comb consisting of axial modes in an OPO cavity. We outline an experimental system that generates cluster states across the spatial frequency comb which can also scale the amount of quantum noise reduction to potentially larger than in other systems.

  16. Clustering Fossils in Solid Inflation

    E-Print Network [OSTI]

    Mohammad Akhshik

    2014-09-10T23:59:59.000Z

    In solid inflation the single field non-Gaussianity consistency condition is violated. As a result, the long tensor perturbation induces observable clustering fossils in the form of quardupole anisotropy in large scale structure power spectrum. In this work we revisit the bispectrum analysis for the scalar-scalar-scalar and tensor-scalar-scalar for the general parameter space of solid. We consider the parameter space of the model in which the level of non-Gaussianity generated is consistent with Planck constraints. Specializing to this allowed range of model parameter, we calculate the quadrupole anisotropy induced from the long tensor perturbations on the power spectrum of scalar perturbations. We argue that imprints of clustering fossil from primordial gravitational waves on large scale structures can be detected from the future galaxy surveys.

  17. Pair extended coupled cluster doubles

    E-Print Network [OSTI]

    Henderson, Thomas M; Scuseria, Gustavo E

    2015-01-01T23:59:59.000Z

    The accurate and efficient description of strongly correlated systems remains an important challenge for computational methods. Doubly occupied configuration interaction (DOCI), in which all electrons are paired and no correlations which break these pairs are permitted, can in many cases provide an accurate account of strong correlations, albeit at combinatorial computational cost. Recently, there has been significant interest in a method we refer to as pair coupled cluster doubles (pCCD), a variant of coupled cluster doubles in which the electrons are paired. This is simply because pCCD provides energies nearly identical to those of DOCI, but at mean-field computational cost (disregarding the cost of the two-electron integral transformation). Here, we introduce the more complete pair extended coupled cluster doubles (pECCD) approach which, like pCCD, has mean-field cost and reproduces DOCI energetically. We show that unlike pCCD, pECCD also reproduces the DOCI wave function with high accuracy. Moreoever, pEC...

  18. Binary Frequencies in Globular Clusters

    E-Print Network [OSTI]

    Ji, Jun

    2015-01-01T23:59:59.000Z

    Binary stars are predicted to have an important role in the evolution of globular clusters, so we obtained binary fractions for 35 globular clusters that were imaged in the F606W and F814W with the ACS on the Hubble Space Telescope. When compared to the values of prior efforts (Sollima et al. 2007; Milone et al. 2012), we find significant discrepancies, despite each group correcting for contamination effects and having performed the appropriate reliability tests. The most reliable binary fractions are obtained when restricting the binary fraction to q > 0.5. Our analysis indicates that the range of the binary fractions is nearly an order of magnitude for the lowest dynamical ages, suggesting that there is a broad distribution in the binary fraction at globular cluster formation. Dynamical effects also appears to decrease the core binary fractions by a factor of two over a Hubble time, but this is a weak relationship. We confirm a correlation from previous work that the binary fraction within the core radius d...

  19. Los XIII temporales teatrales de Puerto Montt

    E-Print Network [OSTI]

    Piga, Domingo

    2001-10-01T23:59:59.000Z

    FALL 2001 151 Los XII temporales teatrales de Puerto Montt Domingo Piga En el mes de junio de este año llegaron hasta Puerto Montt, Chile, 30 compañías de toda Latinoamérica y de Europa. Cada vez se amplía más el abanico de arte dramático que... cubre esa vasta región de Chile. El público de esa zona goza simultáneamente de todos los espectáculos, recibiendo todas las tendencias, estilos y géneros de arte dramático que en este momento exhiben los escenarios de todo el mundo. La alta calidad...

  20. Los Humeros Geothermal Area | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:Landowners andLodgepole, Nebraska:LongboardLoretto,Los(Redirected from LosLos

  1. Los Alamos scientists advance biomass fuel production

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos AlamosLosChristopherLos

  2. Constraining globular cluster formation through studies of young massive clusters - V. ALMA observations of clusters in the Antennae

    E-Print Network [OSTI]

    Cabrera-Ziri, I; Longmore, S N; Brogan, C; Hollyhead, K; Larsen, S S; Whitmore, B; Johnson, K; Chandar, R; Henshaw, J D; Davies, B; Hibbard, J E

    2015-01-01T23:59:59.000Z

    Some formation scenarios that have been put forward to explain multiple populations within Globular Clusters (GCs) require that the young massive cluster have large reservoirs of cold gas within them, which is necessary to form future generations of stars. In this paper we use deep observations taken with Atacama Large Millimeter/sub-millimeter Array (ALMA) to assess the amount of molecular gas within 3 young (50-200 Myr) massive (~10^6 Msun) clusters in the Antennae galaxies. No significant CO(3--2) emission was found associated with any of the three clusters. We place upper limits for the molecular gas within these clusters of ~1x10^5 Msun (or cool gas within young massive clusters at these ages.

  3. Publications of Los Alamos research, 1987

    SciTech Connect (OSTI)

    Varjabedian, K.; McClary, W.J.; Rich, J.A.; Dussart, S.A. (comps.)

    1988-09-01T23:59:59.000Z

    This bibliography lists unclassified publications of work done at the Los Alamos National Laboratory for 1987. The entries, which are subdivided by broad subject categories, are cross-referenced with an author index and a numeric index.

  4. Publications of Los Alamos research, 1986

    SciTech Connect (OSTI)

    Sheridan, C.J.; McClary, W.J.; Rich, J.A.; Dussart, S.A.; (comps.)

    1987-09-01T23:59:59.000Z

    This bibliography lists unclassified publications of work done at the Los Alamos National Laboratory for 1986. The entries, which are subdivided by broad subject categories, are cross-referenced with an author index and a numberic index.

  5. From Earth to Saturn: Los Alamos Achievements

    ScienceCinema (OSTI)

    McMillan, Charlie; Wilson, Cathy; Nekimkem, Howard; Martinez, Johnnie; Martz, Joe; Albright, Brian

    2014-08-13T23:59:59.000Z

    A compilation of some of the remarkable achievements of Los Alamos National Laboratory staff over the past 12 months. Originally aired in the June 26, 2008 Director's all-employee meeting.

  6. New Rad Lab for Los Alamos

    ScienceCinema (OSTI)

    None

    2010-01-08T23:59:59.000Z

    The topping out ceremony for a key construction stage in the Los Alamos National Laboratory's newest facility, the Radiological Laboratory Utility & Office Building. This is part of the National Nu...  

  7. New Rad Lab for Los Alamos

    SciTech Connect (OSTI)

    2008-08-06T23:59:59.000Z

    The topping out ceremony for a key construction stage in the Los Alamos National Laboratory's newest facility, the Radiological Laboratory Utility & Office Building. This is part of the National Nu...  

  8. Los Angeles County- LEED for County Buildings

    Broader source: Energy.gov [DOE]

    In January 2007, the Los Angeles County Board of Supervisors adopted rules to require that all new county buildings greater than 10,000 square feet be LEED Silver certified. All buildings...

  9. City of Los Angeles- Zoning Code

    Broader source: Energy.gov [DOE]

    Chapter I of Los Angeles' Municipal Code, Height of Building or Structures, provides an exemption for solar energy devices, or similar structures. They may be erected above the height limit...

  10. Los Angeles County- Commercial PACE (California)

    Broader source: Energy.gov [DOE]

    Businesses in Los Angeles County may be eligible for the county's Property Assessed Clean Energy (PACE) program. PACE programs allow businesses to finance energy and water efficiency projects which...

  11. Publications of Los Alamos research 1988

    SciTech Connect (OSTI)

    Varjabedian, K.; Dussart, S.A.; McClary, W.J.; Rich, J.A. (comps.)

    1989-12-01T23:59:59.000Z

    This bibliography lists unclassified publications of work done at the Los Alamos National Laboratory for 1988. The entries, which are subdivided by broad subject categories, are cross-referenced with an author index and a numeric index.

  12. City of Los Angeles Bureau of Sanitation

    SciTech Connect (OSTI)

    Not Available

    2004-02-01T23:59:59.000Z

    Fact sheet compares emissions testing of Dual-Fuel liquefied natural gas (LNG) and diesel Los Angeles Bureau of Sanitation refuse trucks, performed by DOE's Advanced Vehicle Testing Activity.

  13. Environmental surveillance at Los Alamos during 1994

    SciTech Connect (OSTI)

    NONE

    1996-07-01T23:59:59.000Z

    This report describes environmental monitoring activities at Los Alamos National Laboratory for 1994. Data were collected to assess external penetrating radiation, airborne emissions, liquid effluents, radioactivity of environmental materials and food stuffs, and environmental compliance.

  14. Internship at Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Dunham, Ryan Q. [Los Alamos National Laboratory

    2012-07-11T23:59:59.000Z

    Los Alamos National Laboratory (LANL) is located in Los Alamos, New Mexico. It provides support for our country's nuclear weapon stockpile as well as many other scientific research projects. I am an Undergraduate Student Intern in the Systems Design and Analysis group within the Nuclear Nonproliferation division of the Global Security directorate at LANL. I have been tasked with data analysis and modeling of particles in a fluidized bed system for the capture of carbon dioxide from power plant flue gas.

  15. An Equal Opportunity Employer / Operated by Los Alamos National Security LLC for DOE/NNSA Los Alamos Postdoc Program Office

    E-Print Network [OSTI]

    An Equal Opportunity Employer / Operated by Los Alamos National Security LLC for DOE/NNSA Los / Operated by Los Alamos National Security LLC for DOE/NNSA provide you with an invoice before we receive Opportunity Employer / Operated by Los Alamos National Security LLC for DOE/NNSA Los Alamos Postdoc Career

  16. Oct 30th & 31st Clustering review

    E-Print Network [OSTI]

    Mitchell, Tom

    CLUSTERING Oct 30th & 31st Daegun Won #12;Outline ·Clustering review · K-means · GMM · Hierarchical clustering ·Examples #12;K-means & GMM #12;K-means · #12;K-means (2) ·Linear decision boundary · Voronoi #12;LET'S SEE SOME EXAMPLES! #12;K-means ­ seed choice? #12;Oops! #12;K-means ·What's the effect

  17. Los Alamos National Lab staff benchmark Y-12 sustainability programs...

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

    Los Alamos National Lab ... Los Alamos National Lab staff benchmark Y-12 sustainability programs Posted: June 27, 2013 - 3:53pm OAK RIDGE, Tenn. - Staff from Los Alamos National...

  18. Globular Cluster Formation in M82

    E-Print Network [OSTI]

    S. J. Lipscy; P. Plavchan

    2003-11-12T23:59:59.000Z

    We present high resolution mid-infrared (mid-IR; 11.7 and 17.65 micron) maps of the central 400 pc region of the starburst galaxy M82. Seven star forming clusters are identified which together provide ~ 15% of the total mid-IR luminosity of the galaxy. Combining the mid-IR data with thermal radio measurements and near- and mid-IR line emission, we find that these young stellar clusters have inferred masses and sizes comparable to globular clusters. At least 20% of the star formation in M82 is found to occur in super-star clusters.

  19. Black holes in young stellar clusters

    SciTech Connect (OSTI)

    Goswami, Sanghamitra; Kiel, Paul; Rasio, Frederic A. [Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208 (United States)

    2014-02-01T23:59:59.000Z

    We present theoretical models for stellar black hole (BH) properties in young, massive star clusters. Using a Monte Carlo code for stellar dynamics, we model realistic star clusters with N ? 5 × 10{sup 5} stars and significant binary fractions (up to 50%) with self-consistent treatments of stellar dynamics and stellar evolution. We compute the formation rates and characteristic properties of single and binary BHs for various representative ages, cluster parameters, and metallicities. Because of dynamical interactions and supernova (SN) kicks, more single BHs end up retained in clusters compared to BHs in binaries. We also find that the ejection of BHs from a cluster is a strong function of initial density. In low-density clusters (where dynamical effects are negligible), it is mainly SN kicks that eject BHs from the cluster, whereas in high-density clusters (initial central density ? {sub c}(0) ? 10{sup 5} M {sub ?} pc{sup –3} in our models) the BH ejection rate is enhanced significantly by dynamics. Dynamical interactions of binary systems in dense clusters also modify the orbital period and eccentricity distributions while increasing the probability of a BH having a more massive companion.

  20. Wide field imaging of distant clusters

    E-Print Network [OSTI]

    T. Treu

    2004-08-05T23:59:59.000Z

    Wide field imaging is key to understanding the build-up of distant clusters and their galaxy population. By focusing on the so far unexplored outskirts of clusters, where infalling galaxies first hit the cluster potential and the hot intracluster medium, we can help separate cosmological field galaxy evolution from that driven by environment. I present a selection of recent advancements in this area, with particular emphasis on Hubble Space Telescope wide field imaging, for its superior capability to deliver galaxy morphologies and precise shear maps of distant clusters.

  1. Multiphoton ionization of large water clusters

    SciTech Connect (OSTI)

    Apicella, B., E-mail: apicella@irc.cnr.it [Combustion Research Institute, IRC–C.N.R., P.le Tecchio 80, 80125 Napoli (Italy); Li, X. [Key Laboratory of Power Machinery and Engineering, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240 (China); Passaro, M. [CNISM and Chemical Engineering, Materials and Industrial Production Department, University of Naples “Federico II,” P.le Tecchio 80, 80125 Napoli (Italy); Spinelli, N. [CNISM and Physics Department, University of Naples “Federico II,” Via Cintia, 80124 Napoli (Italy); Wang, X. [SPIN–C.N.R., Via Cintia, 80124 Napoli (Italy)

    2014-05-28T23:59:59.000Z

    Water clusters are multimers of water molecules held together by hydrogen bonds. In the present work, multiphoton ionization in the UV range coupled with time of flight mass spectrometry has been applied to water clusters with up to 160 molecules in order to obtain information on the electronic states of clusters of different sizes up to dimensions that can approximate the bulk phase. The dependence of ion intensities of water clusters and their metastable fragments produced by laser ionization at 355 nm on laser power density indicates a (3+1)-photon resonance-enhanced multiphoton ionization process. It also explains the large increase of ionization efficiency at 355 nm compared to that at 266 nm. Indeed, it was found, by applying both nanosecond and picosecond laser ionization with the two different UV wavelengths, that no water cluster sequences after n = 9 could be observed at 266 nm, whereas water clusters up to m/z 2000 Th in reflectron mode and m/z 3000 Th in linear mode were detected at 355 nm. The agreement between our findings on clusters of water, especially true in the range with n > 10, and reported data for liquid water supports the hypothesis that clusters above a critical dimension can approximate the liquid phase. It should thus be possible to study clusters just above 10 water molecules, for getting information on the bulk phase structure.

  2. The Impact of Rotation on Cluster Dynamics

    E-Print Network [OSTI]

    Christian Boily

    2000-02-23T23:59:59.000Z

    The evolution of rotating, isolated clusters of stars up to core-collapse is investigated with n-body numerical codes. The simulations start off from axisymmetric generalisations of King profiles, with added global angular momentum. In this contribution I report on results obtained for two sets of single-mass cluster simulations. These confirm the more rapid evolution of even mildly-rotating clusters. A model is presented with rotational energy comparable to omega-Centauri's; it reaches core-collapse in less than half the time required for non-rotating model clusters.

  3. Optimization of synchronization in gradient clustered networks

    E-Print Network [OSTI]

    Xingang Wang; Liang Huang; Ying-Cheng Lai; Choy Heng Lai

    2007-11-23T23:59:59.000Z

    We consider complex clustered networks with a gradient structure, where sizes of the clusters are distributed unevenly. Such networks describe more closely actual networks in biophysical systems and in technological applications than previous models. Theoretical analysis predicts that the network synchronizability can be optimized by the strength of the gradient field but only when the gradient field points from large to small clusters. A remarkable finding is that, if the gradient field is sufficiently strong, synchronizability of the network is mainly determined by the properties of the subnetworks in the two largest clusters. These results are verified by numerical eigenvalue analysis and by direct simulation of synchronization dynamics on coupled-oscillator networks.

  4. The BMW X-ray Cluster Survey

    E-Print Network [OSTI]

    Alberto Moretti; Luigi Guzzo; Sergio Campana; Stefano Covino; Davide Lazzati; Marcella Longhetti; Emilio Molinari; Maria Rosa Panzera; Gianpiero Tagliaferri; Ian Dell'Antonio

    2001-03-21T23:59:59.000Z

    We describe the main features of the BMW survey of serendipitous X-ray clusters, based on the still unexploited ROSAT-HRI archival observations. The sky coverage, surface density and first deep optical CCD images of the candidates indicate that this sample can represent an excellent complement to the existing PSPC deep cluster surveys and will provide us with a fully independent probe of the evolution of the cluster abundance, in addition to significantly increasing the number of clusters known at z>0.6.

  5. The BMW X-ray Cluster Survey

    E-Print Network [OSTI]

    Moretti, A; Campana, S; Covino, S; Lazzati, D; Longhetti, M; Molinari, E; Panzera, M R; Tagliaferri, G; Dell'Antonio, I P; Moretti, Alberto; Guzzo, Luigi; Campana, Sergio; Covino, Stefano; Lazzati, Davide; Longhetti, Marcella; Molinari, Emilio; Panzera, Maria Rosa; Tagliaferri, Gianpiero; Antonio, Ian Dell'

    2001-01-01T23:59:59.000Z

    We describe the main features of the BMW survey of serendipitous X-ray clusters, based on the still unexploited ROSAT-HRI archival observations. The sky coverage, surface density and first deep optical CCD images of the candidates indicate that this sample can represent an excellent complement to the existing PSPC deep cluster surveys and will provide us with a fully independent probe of the evolution of the cluster abundance, in addition to significantly increasing the number of clusters known at z>0.6.

  6. The fundamental plane of clusters of galaxies: a quest for understanding cluster dynamics and morphology

    E-Print Network [OSTI]

    Christoph Fritsch; Thomas Buchert

    1999-03-10T23:59:59.000Z

    We discuss implications of the fundamental plane parameters of clusters of galaxies derived from combined optical and X-ray data of a sample of 78 nearby clusters. In particular, we investigate the dependence of these parameters on the dynamical state of the cluster. We introduce a new concept of allocation of the fundamental plane of clusters derived from their intrinsic morphological properties, and put some theoretical implications of the existence of a fundamental plane into perspective.

  7. Cold Gas in Cluster Cores

    E-Print Network [OSTI]

    Megan Donahue

    2006-11-26T23:59:59.000Z

    I review the literature's census of the cold gas in clusters of galaxies. Cold gas here is defined as the gas that is cooler than X-ray emitting temperatures (~10^7 K) and is not in stars. I present new Spitzer IRAC and MIPS observations of Abell 2597 (PI: Sparks) that reveal significant amounts of warm dust and star formation at the level of 5 solar masses per year. This rate is inconsistent with the mass cooling rate of 20 +/- 5 solar masses per year inferred from a FUSE [OVI] detection.

  8. LOS ALAMOS, New Mexico, August 20, 2012-Scientists at Los Alamos...

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

    Laser research shows promise for cancer treatment August 20, 2012 New insights gained on how lasers generate ions in dense plasmas LOS ALAMOS, New Mexico, August 20,...

  9. Detecting Climate Change in Multivariate Time Series Data by Novel Clustering and Cluster Tracing Techniques

    E-Print Network [OSTI]

    Detecting Climate Change in Multivariate Time Series Data by Novel Clustering and Cluster Tracing Aachen University, Germany {kremer, guennemann, seidl}@cs.rwth-aachen.de Abstract--Climate change can series, and trace the clusters over time. A climate pattern is categorized as a changing pattern

  10. Agglomerative Fuzzy K-Means Clustering Algorithm with Selection of Number of Clusters

    E-Print Network [OSTI]

    Cheung, Yiu-ming

    Agglomerative Fuzzy K-Means Clustering Algorithm with Selection of Number of Clusters Mark Junjie--In this paper, we present an agglomerative fuzzy K-Means clustering algorithm for numerical data, an extension to the standard fuzzy K-Means algorithm by introducing a penalty term to the objective function to make

  11. Optimal interval clustering: Application to Bregman clustering and statistical mixture learning

    E-Print Network [OSTI]

    Nielsen, Frank

    clustering of n scalar elements into k pairwise disjoint intervals. This case includes 1D Euclidean k-means- hood. Index Terms--Clustering, dynamic programming, k-means, Bregman divergences, statistical mixtures is the celebrated k-means [1] that seeks to minimize the sum of intra-cluster variances by prescribing beforehand

  12. DOE Issues Request for Information for Los Alamos National Laboratory...

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

    Los Alamos National Laboratory DOE Awards Small Business Contract for Site Characterization and Erosion Control Work in Los Alamos, New Mexico DOE Awards Support Service Contract...

  13. Los Alamos Field Office | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    Us Our Operations Management and Budget Office of Civil Rights Workforce Statistics Los Alamos Field Office Los Alamos Field Office FY15 Semi Annual Report FY14 Year...

  14. Los Alamos' continued commitment to our friends, partners and...

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

    Personal message Community Connections: Your link to news and opportunities from Los Alamos National Laboratory Latest Issue: May 2015 All Issues submit Los Alamos' continued...

  15. aires cuando los: Topics by E-print Network

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

    no hemos necesitado m Cilleruelo, Javier 172 LOS CONTROVERTIDOS "DERECHOS OPONIBLES" Eric Millard Computer Technologies and Information Sciences Websites Summary: LOS...

  16. Study finds radioactivity around Los Alamos largely due to natural...

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

    Los Alamos, and air monitoring programs from LANL and others have not detected airborne contamination more than 1 mile from the boundaries of Los Alamos County. The observed...

  17. Located in historic Los Alamos, New Mexico against the backdrop...

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

    Located in historic Los Alamos, New Mexico against the backdrop of the lush Jemez Mountains, Los Alamos National Laboratory (LANL) offers its education program participants...

  18. Los Alamos National Laboratory, Sandia Labs, other major employers...

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

    STEM education in New Mexico Los Alamos National Laboratory, Sandia Labs, other major employers commit to STEM education in New Mexico Los Alamos, Sandia and several partners are...

  19. Los Alamos improves biomass-to-fuel process

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

    Biomass-to-fuel Process Improved Los Alamos improves biomass-to-fuel process Los Alamos scientists and collaborators published an article in the scientific journal Nature Chemistry...

  20. The City of Los Angeles LED Streetlight Program

    Broader source: Energy.gov [DOE]

    View the video about the Los Angeles LED streetlight program, featuring an interview with City of Los Angeles Bureau of Street Lighting Director, Ed Ebrahimian.

  1. 2010 Annual Workforce Analysis and Staffing Plan Report - Los...

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

    0 Annual Workforce Analysis and Staffing Plan Report - Los Alamos Site Office 2010 Annual Workforce Analysis and Staffing Plan Report - Los Alamos Site Office Managers perform an...

  2. Los Alamos National Laboratory describes storm damage to environmental...

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

    Los Alamos National Laboratory describes storm damage Los Alamos National Laboratory describes storm damage to environmental monitoring stations, canyons Stations supporting Santa...

  3. Independent Oversight Activity Report, Los Alamos National Laboratory...

    Office of Environmental Management (EM)

    in the development and implementation of the Los Alamos National Laboratory industrial hygiene worker exposure assessment program. Independent Oversight Activity Report, Los Alamos...

  4. Central Characterization Program (CCP) Los Alamos National Laboratory...

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

    Los Alamos National Laboratory (LANL) Interface Document Central Characterization Program (CCP) Los Alamos National Laboratory (LANL) Interface Document This document was used to...

  5. Four of Popular Science's 100 best innovations from Los Alamos...

    National Nuclear Security Administration (NNSA)

    of Popular Science's 100 best innovations from Los Alamos, Sandia, Livermore Popular Science lists three of 100 best innovations from Los Alamos, Sandia Four of Popular Science's...

  6. Los Angeles County Makeover Contest Attracts More Than Just Winners...

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

    words 'Energy Upgrade California.' Six homeowners from Los Angeles County will receive free home energy makeovers from a contest organized by Energy Upgrade California in Los...

  7. Los Alamos National Laboratory selects three small businesses...

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

    for environmental work Los Alamos exceeds waste shipping goal Excavation Enclosures At MDA B Removing nuclear waste, one shipment at a time Los Alamos plants willows More...

  8. Los lideres de energia en EEUU toman medidas para desarrollar...

    Office of Environmental Management (EM)

    positiva a travs de los cinco elementos de ECPA: la eficiencia energtica, la energa renovable, los hidrocarburos ms limpios, la infraestructura crtica, y alivio de...

  9. Willows Aid Flood Recovery in Los Alamos Desert

    Broader source: Energy.gov [DOE]

    LOS ALAMOS, N.M. – Los Alamos National Laboratory’s Associate Directorate of Environmental Programs (ADEP) has been busy with various flood recovery activities since last fall. 

  10. Demixing cascades in cluster crystals

    E-Print Network [OSTI]

    Nigel B. Wilding; Peter Sollich

    2014-07-14T23:59:59.000Z

    In a cluster crystal, each lattice site is occupied by multiple soft-core particles. As the number density is increased at zero temperature, a `cascade' of isostructural phase transitions can occur between states whose site occupancy differs by unity. For low but finite temperature, each of these transitions terminates in a critical point. Using tailored Monte Carlo simulation techniques we have studied such demixing cascades in systems of soft particles interacting via potentials of the generalized exponential form $u(r)=\\epsilon\\exp[-(r/\\sigma)^n]$. We have estimated the critical parameters of the first few transitions in the cascade as a function of the softness parameter $n$. The critical temperature and pressure exhibit non-monotonic behaviour as $n$ is varied, although the critical chemical potential remains monotonic. The trends for the pressure and chemical potential are confirmed by cell model calculations at zero temperature. As $n\\to 2^+$, all the transitions that we have observed are preempted by melting although we cannot rule out that clustering transitions survive at high density.

  11. Adsorption, Desorption, and Clustering H20 on Pt (111). | EMSL

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

    Desorption, and Clustering H20 on Pt (111). Adsorption, Desorption, and Clustering H20 on Pt (111). Abstract: The adsorption, desorption, and clustering behavior of H20 on Pt(111)...

  12. Au34-: A Fluxional Core-Shell Cluster. | EMSL

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

    Au34-: A Fluxional Core-Shell Cluster. Au34-: A Fluxional Core-Shell Cluster. Abstract: Among the large Aun – clusters for n > 20, the photoelectron spectra of Au34...

  13. Consensus Clustering Algorithms: Comparison and Refinement Andrey Goder

    E-Print Network [OSTI]

    Filkov, Vladimir

    -deterministic clustering algorithms, e.g. K-means, are sensitive to the choice of the initial seed clusters; running K-meansConsensus Clustering Algorithms: Comparison and Refinement Andrey Goder Vladimir Filkov Computer

  14. When Network Coding improves the Performances of Clustered Wireless Networks

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    When Network Coding improves the Performances of Clustered Wireless Networks that significantly increases the performances of clustering algorithms in wireless multi-hop networks-XOR coding; wireless multi-hop networks; clustering I. INTRODUCTION Partitioning nodes

  15. Knowledge-based cluster development in India : opportunities and challenges

    E-Print Network [OSTI]

    Singla, Chandan Dev

    2008-01-01T23:59:59.000Z

    Knowledge-based industries tend to cluster. The nature of activities illustrate the importance of networks and virtual and proximity aspects of clustering. Review of existing literature brings out the advantages of clustering ...

  16. Dynamics of excess electrons in atomic and molecular clusters

    E-Print Network [OSTI]

    Young, Ryan Michael

    2011-01-01T23:59:59.000Z

    Time-Resolved Dynamics in Acetonitrile Cluster Anions (CH 3Time-resolved dynamics in acetonitrile clusters anions (CH 3resolved dynamics in acetonitrile clusters anions (CH 3 CN)

  17. THE APM CLUSTER SURVEY: CLUSTER DETECTION AND LARGE-SCALE STRUCTURE

    E-Print Network [OSTI]

    G. B. Dalton

    1995-05-17T23:59:59.000Z

    The APM Cluster Survey was based on a modification of Abell's original classification scheme for galaxy clusters. Here we discuss the results of an investigation of the stability of the statistical properties of the cluster catalogue to changes in the selection parameters. For a poor choice of selection parameters we find clear indications of line-of-sight clusters, but there is a wide range of input parameters for which the statistical properties of the catalogue are stable. We conclude that clusters selected in this way are indeed useful as tracers of large-scale structure.

  18. Energy Accounting and Control on HPC clusters

    E-Print Network [OSTI]

    Lefèvre, Laurent

    Energy Accounting and Control on HPC clusters Yiannis Georgiou R&D Software Engineer #12;Objectives Issues that we wanted to deal with: Measure power and energy consumption on HPC clusters Attribute power and energy data to HPC components Calculate the energy consumption of jobs in the system Extract power

  19. Clustering Web Search Results Using Fuzzy Ants

    E-Print Network [OSTI]

    Gent, Universiteit

    Clustering Web Search Results Using Fuzzy Ants Steven Schockaert,* Martine De Cock, Chris Cornelis and Uncertainty Modelling Research Unit, Krijgslaan 281 (S9), B-9000 Gent, Belgium Algorithms for clustering Web existing approaches and illustrates how our algorithm can be applied to the problem of Web search results

  20. Cluster Parallel Loops Part I. Preliminaries

    E-Print Network [OSTI]

    Kaminsky, Alan

    ;14­2 BIG CPU, BIG DATA he massively parallel Bitcoin mining program in Chapter 13 still doesn't take full advantage of the cluster's parallel processing capabilities. Each Bitcoin mining task uses all the cores on just one node. So on the 10-node tardis cluster, I have to mine 10 or more Bitcoins to fully utilize

  1. An Experimental Comparison of Kernel Clustering Methods

    E-Print Network [OSTI]

    Masulli, Francesco

    , Support Vec- tor Clustering, and three standard methods: K-means, FCM-I, and FCM-II. The motiva- tion. #12;2. Methods 2.1. K-means This is the standard K-means clustering algorithm [13], included to be equal, while for m close to one we obtain crisp memberships as in K-means. By a Lagrangian approach

  2. STELLAR ENCOUNTER RATE IN GALACTIC GLOBULAR CLUSTERS

    SciTech Connect (OSTI)

    Bahramian, Arash; Heinke, Craig O.; Sivakoff, Gregory R.; Gladstone, Jeanette C., E-mail: bahramia@ualberta.ca [Department of Physics, University of Alberta, CCIS 4-183, Edmonton, AB, T5K 1V4 (Canada)

    2013-04-01T23:59:59.000Z

    The high stellar densities in the cores of globular clusters cause significant stellar interactions. These stellar interactions can produce close binary mass-transferring systems involving compact objects and their progeny, such as X-ray binaries and radio millisecond pulsars. Comparing the numbers of these systems and interaction rates in different clusters drives our understanding of how cluster parameters affect the production of close binaries. In this paper we estimate stellar encounter rates ({Gamma}) for 124 Galactic globular clusters based on observational data as opposed to the methods previously employed, which assumed 'King-model' profiles for all clusters. By deprojecting cluster surface brightness profiles to estimate luminosity density profiles, we treat 'King-model' and 'core-collapsed' clusters in the same way. In addition, we use Monte Carlo simulations to investigate the effects of uncertainties in various observational parameters (distance, reddening, surface brightness) on {Gamma}, producing the first catalog of globular cluster stellar encounter rates with estimated errors. Comparing our results with published observations of likely products of stellar interactions (numbers of X-ray binaries, numbers of radio millisecond pulsars, and {gamma}-ray luminosity) we find both clear correlations and some differences with published results.

  3. PHOTOIONIZED TOF MASS SPECTROMETRY OF ATOMIC CLUSTERS

    E-Print Network [OSTI]

    Maruyama, Shigeo

    for sev eral cluster sou rce nozzle condition s. Heliu m gas pressu re at the tim e of v aporization of solid m aterial played the key role in cluster size range obtain ed. Th e effect of pressu re was thorou

  4. Projection-based curve clustering Benjamin AUDER

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -hydraulic computer code CATHARE is used to study the re- liability of reactor vessels. The code inputs are physical parameters and the outputs are time evolution curves of a few other physical quantities. As the CATHARE code process involves a clustering step. In the present paper, CATHARE output curves are clustered using a k

  5. Scale Height Evolution of Star Clusters

    E-Print Network [OSTI]

    Froebrich, Dirk

    0) Introduction 1) The FSR Cluster Sample 2) Photometric Decontamination 3) Old Clusters 4) Distance/Background decontamination adaptation of the (Bonatto & Bica 2007) decontamination procedure #12;Fore/Background decontamination adaptation of the (Bonatto & Bica 2007) decontamination procedure calculate CCM distance between

  6. Regional Innovation Clusters September 25 , 2012

    E-Print Network [OSTI]

    Levinson, David M.

    prosperity ­ Find, birth, build and celebrate clusters ­ Improve the business environment ­ Connect the dots by Professor Michael E. Porter and Monitor Company Group, L.P. -- Confidential -- CAM Q BMW Spartanburg #12 Automotive Cluster #12;Timken Technology Center Carroll A. Campbell Graduate Engineering Center IBMOracle BMW

  7. Los Alamos Overview Los Alamos National Laboratory is a premier national security

    E-Print Network [OSTI]

    on nuclear nonproliferation and bor- der security, energy and infrastructure security, and measuresLos Alamos Overview Los Alamos National Laboratory is a premier national security research's basic mission: to ensure the safety, security, and effectiveness of the nation's nuclear deter- rent

  8. Publications of Los Alamos Research 1982

    SciTech Connect (OSTI)

    McClary, W.J.; Rodriguez, L.L.; Sheridan, C.J. (comps.)

    1983-10-01T23:59:59.000Z

    This bibliography is a compilation of unclassified publications of work done at the Los Alamos National Laboratory for 1982. Papers published in 1982 are included regardless of when they were actually written. Publications received too late for inclusion in earlier compilations have also been listed. Declassfiication of previously classified reports is considered to constitute publication. All classified issuances are omitted - even those papers, themselves unclassified, which were published only as part of a classified document. If a paper was published more than once, all places of publication are included. The bibliography includes Los Alamos National Laboratory reports, papers released as non-Laboratory reports, journal articles, books, chapters of books, conference papers either published separately or as part of conference proceedings issued as books or reports, papers published in congressional hearings, theses, and US patents. Publications by Los Alamos authors that are not records of Laboratory-sponsored work are included when the Library becomes aware of them.

  9. Publications of Los Alamos research 1980

    SciTech Connect (OSTI)

    Salazar, C.A.; Willis, J.K. (comps.)

    1981-09-01T23:59:59.000Z

    This bibliography is a compilation of unclassified publications of work done at the Los Alamos National Laboratory for 1980. Papers published in 1980 are included regardless of when they were actually written. Publications received too late for inclusion in earlier compilations have also been listed. Declassification of previously classified reports is considered to constitute publication. All classified issuances are omitted-even those papers, themselves unclassified, which were published only as part of a classified document. If a paper was pubished more than once, all places of publication are included. The bibliography includes Los Alamos National Laboratory reports, papers released as non-laboratory reports, journal articles, books, chapters of books, conference papers published either separately or as part of conference proceedings issued as books or reports, papers published in congressional hearings, theses, and US patents. Publications by Los Alamos authors that are not records of Laboratory-sponsored work are included when the Library becomes aware of them.

  10. Publications of Los Alamos Research, 1983

    SciTech Connect (OSTI)

    Sheridan, C.J.; McClary, W.J.; Rich, J.A.; Rodriguez, L.L. (comps.)

    1984-10-01T23:59:59.000Z

    This bibliography is a compilation of unclassified publications of work done at the Los Alamos National Laboratory for 1983. Papers published in 1982 are included regardless of when they were actually written. Publications received too late for inclusion in earlier compilations have also been listed. Declassification of previously classified reports is considered to constitute publication. All classified issuances are omitted - even those papers, themselves unclassified, which were published only as part of a classified document. If a paper was published more than once, all places of publication are included. The bibliography includes Los Alamos National Laboratory reports, papers released as non-Laboratory reports, journal articles, books, chapters of books, conference papers either published separately or as part of conference proceedings issued as books or reports, papers publishd in congressional hearings, theses, and US patents. Publications by Los Alamos authors that are not records of Laboratory-sponsored work are included when the Library becomes aware of them.

  11. M31 Globular Clusters in the HST Archive: I. Cluster Detection and Completeness

    E-Print Network [OSTI]

    P. Barmby; J. P. Huchra

    2001-07-20T23:59:59.000Z

    Globular clusters at the distance of M31 have apparent angular sizes of a few arcseconds. While many M31 GCs have been detected and studied from ground-based images, the high spatial resolution of HST allows much more robust detection and characterization of star cluster properties. We present the results of a search of 157 HST/WFPC2 images of M31: we found 82 previously-cataloged globular cluster candidates as well as 32 new globular cluster candidates and 20 open cluster candidates. We present images of the new candidates and photometry for all clusters. We assess existing cluster catalogs' completeness and use the results to estimate the total number of GCs in M31 as 460+/-70. The specific frequency is S_N = 1.2+/-0.2 and the mass specific frequency T = 2.4+/-0.4; these values are at the upper end of the range seen for spiral galaxies.

  12. THE MASSIVE DISTANT CLUSTERS OF WISE SURVEY: THE FIRST DISTANT GALAXY CLUSTER DISCOVERED BY WISE

    SciTech Connect (OSTI)

    Gettings, Daniel P.; Gonzalez, Anthony H.; Mancone, Conor [Department of Astronomy, University of Florida, 211 Bryant Space Center, Gainesville, FL 32611 (United States); Stanford, S. Adam [Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States); Eisenhardt, Peter R. M.; Stern, Daniel [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Brodwin, Mark [Department of Physics and Astronomy, University of Missouri, 5110 Rockhill Road, Kansas City, MO 64110 (United States); Zeimann, Gregory R. [Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States); Masci, Frank J. [Infrared Processing and Analysis Center, California Institute of Technology 100-22, Pasadena, CA 91125 (United States); Papovich, Casey [George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A and M University, College Station, TX, 77843-4242 (United States); Tanaka, Ichi [Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720 (United States); Wright, Edward L. [UCLA Astronomy, P.O. Box 951547, Los Angeles, CA 90095-1547 (United States)

    2012-11-01T23:59:59.000Z

    We present spectroscopic confirmation of a z = 0.99 galaxy cluster discovered using data from the Wide-field Infrared Survey Explorer (WISE). This is the first z {approx} 1 cluster candidate from the Massive Distant Clusters of WISE Survey to be confirmed. It was selected as an overdensity of probable z {approx}> 1 sources using a combination of WISE and Sloan Digital Sky Survey DR8 photometric catalogs. Deeper follow-up imaging data from Subaru and WIYN reveal the cluster to be a rich system of galaxies, and multi-object spectroscopic observations from Keck confirm five cluster members at z = 0.99. The detection and confirmation of this cluster represents a first step toward constructing a uniformly selected sample of distant, high-mass galaxy clusters over the full extragalactic sky using WISE data.

  13. Young massive star clusters in nearby galaxies. I. Identification and general properties of cluster systems

    E-Print Network [OSTI]

    Soeren S. Larsen; Tom Richtler

    1999-02-19T23:59:59.000Z

    Using ground-based UBVRI+Halpha CCD photometry we have been carrying out a search for young massive star clusters (YMCs) in a sample consisting of 21 nearby spiral galaxies. We find a large variety concerning the richness of the cluster systems, with some galaxies containing no YMCs at all and others hosting very large numbers of YMCs. Examples of galaxies with poor cluster systems are NGC 300 and NGC 4395, while the richest cluster systems are found in the galaxies NGC 5236, NGC 2997 and NGC 1313. The age distributions of clusters in these galaxies show no obvious peaks, indicating that massive star clusters are formed as an ongoing process rather than in bursts. This is in contrast to what is observed in starbursts and merger galaxies. The radial distributions of clusters follow the Halpha surface brightness. For the galaxies in our sample there is no correlation between the morphological type and the presence of YMCs

  14. IP Profiling via Service Cluster Membership Vectors

    SciTech Connect (OSTI)

    Bartoletti, A

    2009-02-23T23:59:59.000Z

    This study investigates the feasibility of establishing and maintaining a system of compact IP behavioral profiles as a robust means of computer anomaly definition and detection. These profiles are based upon the degree to which a system's (IP's) network traffic is distributed among stable characteristic clusters derived of the aggregate session traffic generated by each of the major network services. In short, an IP's profile represents its degree of membership in these derived service clusters. The goal is to quantify and rank behaviors that are outside of the statistical norm for the services in question, or present significant deviation from profile for individual client IPs. Herein, we establish stable clusters for accessible features of common session traffic, migrate these clusters over time, define IP behavior profiles with respect to these clusters, migrate individual IP profiles over time, and demonstrate the detection of IP behavioral changes in terms of deviation from profile.

  15. Clustering attributed graphs: models, measures and methods

    E-Print Network [OSTI]

    Bothorel, Cecile; Magnani, Matteo; Micenkova, Barbora

    2015-01-01T23:59:59.000Z

    Clustering a graph, i.e., assigning its nodes to groups, is an important operation whose best known application is the discovery of communities in social networks. Graph clustering and community detection have traditionally focused on graphs without attributes, with the notable exception of edge weights. However, these models only provide a partial representation of real social systems, that are thus often described using node attributes, representing features of the actors, and edge attributes, representing different kinds of relationships among them. We refer to these models as attributed graphs. Consequently, existing graph clustering methods have been recently extended to deal with node and edge attributes. This article is a literature survey on this topic, organizing and presenting recent research results in a uniform way, characterizing the main existing clustering methods and highlighting their conceptual differences. We also cover the important topic of clustering evaluation and identify current open ...

  16. Los Alamos National Laboratory and technology transfer

    SciTech Connect (OSTI)

    Bearce, T.D.

    1992-01-01T23:59:59.000Z

    From its beginning in 1943, Los Alamos National Laboratory (Los Alamos) has traditionally used science and technology to fine creative, but practical solutions to complex problems. Los Alamos National Laboratory is operated by the University of California, under contact to the Department of Energy. We are a Government Owned-contractor Operated (GOCO) facility, and a Federally-funded research and Development Center (FFRDC). At Los Alamos, our mission is to apply science and engineering capabilities to problems of national security. Recently our mission has been broadened to include technology transfer to ensure the scientific and technical solutions are available to the marketplace. We are, in staff and technical capabilities, one of the worlds largest multidisciplinary, multiprogram laboratories. We conduct extensive research in energy, nuclear safeguards and security, biomedical science, conventional defense technologies, space science, computational science, environmental protection and cleanup, materials science, and other basic sciences. Since 1980, by a series of laws and executive orders, the resources of the federal laboratories have been made increasingly available to private industry via technology transfer efforts. Los Alamos National Laboratory uses a variety of technology transfer methods including laboratory visits, cooperative research, licensing, contract research, user facility access, personnel exchanges, consulting, publications, and workshops, seminars and briefings. We also use unique approaches, such as our negotiating teams, to ensure that transfer of our developed technology takes place in an open and competitive manner. During my presentation, I will discuss the overall process and some of the mechanism that we use at Los Alamos to transfer laboratory developed technology.

  17. Los Alamos National Laboratory and technology transfer

    SciTech Connect (OSTI)

    Bearce, T.D.

    1992-05-01T23:59:59.000Z

    From its beginning in 1943, Los Alamos National Laboratory (Los Alamos) has traditionally used science and technology to fine creative, but practical solutions to complex problems. Los Alamos National Laboratory is operated by the University of California, under contact to the Department of Energy. We are a Government Owned-contractor Operated (GOCO) facility, and a Federally-funded research and Development Center (FFRDC). At Los Alamos, our mission is to apply science and engineering capabilities to problems of national security. Recently our mission has been broadened to include technology transfer to ensure the scientific and technical solutions are available to the marketplace. We are, in staff and technical capabilities, one of the worlds largest multidisciplinary, multiprogram laboratories. We conduct extensive research in energy, nuclear safeguards and security, biomedical science, conventional defense technologies, space science, computational science, environmental protection and cleanup, materials science, and other basic sciences. Since 1980, by a series of laws and executive orders, the resources of the federal laboratories have been made increasingly available to private industry via technology transfer efforts. Los Alamos National Laboratory uses a variety of technology transfer methods including laboratory visits, cooperative research, licensing, contract research, user facility access, personnel exchanges, consulting, publications, and workshops, seminars and briefings. We also use unique approaches, such as our negotiating teams, to ensure that transfer of our developed technology takes place in an open and competitive manner. During my presentation, I will discuss the overall process and some of the mechanism that we use at Los Alamos to transfer laboratory developed technology.

  18. Computer System, Cluster, and Networking Summer Institute Program...

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

    System, Cluster, and Networking Summer Institute Program Description The Computer System, Cluster, and Networking Summer Institute (CSCNSI) is a focused technical enrichment...

  19. Gate-tunable exchange coupling between cobalt clusters on graphene...

    Office of Scientific and Technical Information (OSTI)

    Accepted Manuscript: Gate-tunable exchange coupling between cobalt clusters on graphene Citation Details Title: Gate-tunable exchange coupling between cobalt clusters on...

  20. Iridium Complexes and Clusters in Dealuminated Zeolite HY: Distributio...

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

    Iridium Complexes and Clusters in Dealuminated Zeolite HY: Distribution between Crystalline and Impurity Amorphous Regions. Iridium Complexes and Clusters in Dealuminated Zeolite...

  1. Cryogenic CO2 Formation on Oxidized Gold Clusters Synthesized...

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

    Cryogenic CO2 Formation on Oxidized Gold Clusters Synthesized via Reactive Layer Assisted Deposition. Cryogenic CO2 Formation on Oxidized Gold Clusters Synthesized via Reactive...

  2. Approximating K-means-type clustering via semidefinite programming

    E-Print Network [OSTI]

    Jiming Peng

    2005-04-22T23:59:59.000Z

    Apr 22, 2005 ... Approximating K-means-type clustering via semidefinite ... Abstract: One of the fundamental clustering problems is to assign $n$ points into $k$ ...

  3. ClusterSculptor: Software for Expert-Steered Classification of...

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

    and intuitive framework to aid scientists in data classification. ClusterSculptor uses k-means as the overall clustering engine, but allows tuning its parameters interactively,...

  4. Analysis of a Cluster Strategy for Near Term Hydrogen Infrastructure...

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

    a Cluster Strategy for Near Term Hydrogen Infrastructure Rollout in Southern California Analysis of a Cluster Strategy for Near Term Hydrogen Infrastructure Rollout in Southern...

  5. acid gene cluster: Topics by E-print Network

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

    the application of a novel clustering algorithm, Super-Paramagnetic Clustering (SPC) to analysis of gene expression profiles that were generated recently during a study of...

  6. arom gene cluster: Topics by E-print Network

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

    the application of a novel clustering algorithm, Super-Paramagnetic Clustering (SPC) to analysis of gene expression profiles that were generated recently during a study of...

  7. almt1 gene cluster: Topics by E-print Network

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

    the application of a novel clustering algorithm, Super-Paramagnetic Clustering (SPC) to analysis of gene expression profiles that were generated recently during a study of...

  8. All-Boron Aromatic Clusters as Potential New Inorganic Ligands...

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

    Boron Aromatic Clusters as Potential New Inorganic Ligands and Building Blocks in Chemistry. All-Boron Aromatic Clusters as Potential New Inorganic Ligands and Building Blocks in...

  9. High performance computing: Clusters, constellations, MPPs, and future directions

    E-Print Network [OSTI]

    Dongarra, Jack; Sterling, Thomas; Simon, Horst; Strohmaier, Erich

    2003-01-01T23:59:59.000Z

    and Jim Gray, “High Performance Computing: Crays, Clusters,The Marketplace of High-Performance Computing”, ParallelHigh Performance Computing Clusters, Constellations, MPPs,

  10. Optimization of the Coupled Cluster Implementation in NWChem...

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

    the Coupled Cluster Implementation in NWChem on Petascale Parallel Architectures. Optimization of the Coupled Cluster Implementation in NWChem on Petascale Parallel Architectures....

  11. Los Alamos National Laboratory | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:Landowners andLodgepole, Nebraska:LongboardLoretto, Minnesota:LosLos Alamos

  12. Los Azufres Geothermal Area | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:Landowners andLodgepole, Nebraska:LongboardLoretto,Los AngelesAngeles) JumpLos

  13. Los Alamos shipments to Waste Control Specialists

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8, 2014 Los Alamos

  14. Los Alamos wins 2008 Pollution Prevention awards

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8, 2014 Los Alamos2008

  15. Los Alamos exceeds waste shipping goal

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwardspublicexceeds waste shipping goal Los AlamosLos

  16. Occurrences at Los Alamos National Laboratory: What can they tell us?

    SciTech Connect (OSTI)

    Richard A. Reichelt; A. Jeffery Eichorst; Marc E. Clay; Rita J. Henins; Judith D. DeHaven; Richard J. Brake

    2000-03-01T23:59:59.000Z

    The authors analyzed the evolution of institutional and facility response to groups of abnormal incidents at Los Alamos National Laboratory (LANL). The analysis is divided into three stages: (1) the LANL response to severe accidents from 1994 to 1996, (2) the LANL response to facility-specific clusters of low-consequence incidents from 1997 to 1999, and (3) the ongoing development of and response to a Laboratory-wide trending and analysis program. The first stage is characterized by five severe accidents at LANL--a shooting fatality, a forklift accident, two electrical shock incidents, and an explosion in a nuclear facility. Each accident caused LANL and the Department of Energy (DOE) to launch in-depth investigations. A recurrent theme of the investigations was the failure of LANL and DOE to identify and act on precursor or low-consequence events that preceded the severe accidents. The second stage is characterized by LANL response to precursor or low-consequence incidents over a two-year period. In this stage, the Chemistry and Metallurgy Research Facility, the Los Alamos Critical Experiments Facility, and the Los Alamos Neutron Science Center responded to an increase in low-consequence events by standing down their facilities. During the restart process, each facility collectively analyzed the low-consequence events and developed systemic corrective actions. The third stage is characterized by the development of a Laboratory-wide trending and analysis program, which involves proactive division-level analysis of incidents and development of systemic actions. The authors conclude that, while the stages show an encouraging evolution, the facility standdowns and restarts are overly costly and that the institutional trending and analysis program is underutilized. The authors therefore recommend the implementation of an institutional, mentored program of trending and analysis that identifies clusters of related low-consequence events, analyzes those events, and develops systemic actions to avoid both severe accidents and standdowns.

  17. Independent Activity Report, Los Alamos National Laboratory- November 2010

    Broader source: Energy.gov [DOE]

    Los Alamos National Laboratory Chemistry and Metallurgy Research Replacement Project Orientation Visit

  18. THREE-CLUSTER NUCLEAR MOLECULES

    E-Print Network [OSTI]

    D. N. Poenaru; B. Dobrescu; W. Greiner

    2000-01-01T23:59:59.000Z

    A three-center phenomenological model able to explain, at least from a qualitative point of view, the difference in the observed yield of a particle-accompanied fission and that of binary fission was developed. It is derived from the liquid drop model under the assumption that the aligned configuration, with the emitted particle between the light and heavy fragment is obtained by increasing continuously the separation distance, while the radii of the light fragment and of the light particle are kept constant. During the first stage of the deformation one has a two-center evolution until the neck radius becomes equal to the radius of the emitted particle. Then the three center starts developing by decreasing with the same amount the two tip distances. In such a way a second minimum, typical for a cluster molecule, appears in the deformation energy. Examples are presented for 240 Pu parent nucleus emitting ?-particles and 14 C in a ternary process. 1

  19. 2009 Clusters, Nanocrystals & Nanostructures GRC

    SciTech Connect (OSTI)

    Lai-Sheng Wang

    2009-07-19T23:59:59.000Z

    For over thirty years, this Gordon Conference has been the premiere meeting for the field of cluster science, which studies the phenomena that arise when matter becomes small. During its history, participants have witnessed the discovery and development of many novel materials, including C60, carbon nanotubes, semiconductor and metal nanocrystals, and nanowires. In addition to addressing fundamental scientific questions related to these materials, the meeting has always included a discussion of their potential applications. Consequently, this conference has played a critical role in the birth and growth of nanoscience and engineering. The goal of the 2009 Gordon Conference is to continue the forward-looking tradition of this meeting and discuss the most recent advances in the field of clusters, nanocrystals, and nanostructures. As in past meetings, this will include new topics that broaden the field. In particular, a special emphasis will be placed on nanomaterials related to the efficient use, generation, or conversion of energy. For example, we anticipate presentations related to batteries, catalysts, photovoltaics, and thermoelectrics. In addition, we expect to address the controversy surrounding carrier multiplication with a session in which recent results addressing this phenomenon will be discussed and debated. The atmosphere of the conference, which emphasizes the presentation of unpublished results and lengthy discussion periods, ensures that attendees will enjoy a valuable and stimulating experience. Because only a limited number of participants are allowed to attend this conference, and oversubscription is anticipated, we encourage all interested researchers from academia, industry, and government institutions to apply as early as possible. An invitation is not required. We also encourage all attendees to submit their latest results for presentation at the poster sessions. We anticipate that several posters will be selected for 'hot topic' oral presentations. Because of the important role that students and postdocs play in the future of this field, we also anticipate to select several posters from young investigators for oral presentations.

  20. Publications of Los Alamos research, 1985

    SciTech Connect (OSTI)

    Sheridan, C.J.; McClary, W.J.; Rich, J.A.; Dussart, S.A.

    1986-11-01T23:59:59.000Z

    This bibliography is a compilation of unclassified publications of work done at the Los Alamos National Laboratory for 1985, including laboratory reports, papers released as non-laboratory reports, journal articles, books, conference papers, papers published in congrssional hearings, theses, and US patents. (LEW)

  1. MATERIAL TRANSFER AGREEMENT LOS ALAMOS NATIONAL LABORATORY

    E-Print Network [OSTI]

    of business at P.O. Box 1663, Los Alamos, NM 87545 ("RECIPIENT"), the parties to this Agreement being referred with the U.S. Department of Energy, National Nuclear Security Administration. The PROVIDER has developed of Description of use: 4. PROVIDER shall be responsible for all costs of delivery and return shipping

  2. Proceedings of the Los Alamos neutrino workshop

    SciTech Connect (OSTI)

    Boehm, F.; Stephenson, G.J. Jr. (comps.)

    1982-08-01T23:59:59.000Z

    A workshop on neutrino physics was held at Los Alamos from June 8 to 12, 1981. The material presented has been provided in part by the organizers, in part by the chairmen of the working sessions. Closing date for contributions was October 1981.

  3. LOS ALAMOS NATIONAL LABORATORY MATERIAL TRANSFER AGREEMENT

    E-Print Network [OSTI]

    LOS ALAMOS NATIONAL LABORATORY MATERIAL TRANSFER AGREEMENT THISMATERIALTRANSFERAGREEMENT("Agreement to as the "RECIPIENT," the parties to this Agreement being referred to individually as a "Party," and collectively Nuclear Security Administration. Certain MATERIAL has been developed in the course of the PROVIDER

  4. Los Alamos National Laboratory solar program

    SciTech Connect (OSTI)

    Reisfeld, S.K.; Neeper, D.A.

    1982-01-01T23:59:59.000Z

    Progress is reported for passive solar tasks performed at the Los Alamos National Laboratory during FY 1982. Results on test cell experiments for the 1981-1982 winter are reported, as are Class A performance monitoring, passive cooling, both residential and commercial economic cooling assessments, and thermal effects of distributed mass in passive buildings.

  5. Effects of $?$-cluster breaking on 3$?$ cluster structures in $^{12}$C

    E-Print Network [OSTI]

    Tadahiro Suhara; Yoshiko Kanada-En'yo

    2015-02-17T23:59:59.000Z

    To clarify the effects of $\\alpha$-cluster breaking on 3$\\alpha$ cluster structures in $^{12}$C, we investigate $^{12}$C using a hybrid model that combines the Brink-Bloch cluster model with the $p_{3/2}$ subshell closure wave function. We have found that $\\alpha$-cluster breaking caused by spin-orbit force significantly changes cluster structures of excited $0^{+}$ states through orthogonality to lower states. Spatially developed cluster components of the $0^{+}_{2}$ state are reduced. The $0^{+}_{3}$ state changes from a vibration mode in the bending motion of three $\\alpha$ clusters to a chain-like 3$\\alpha$ structure having an open triangle configuration. As a result of these structure changes of $0^{+}$ states, the band assignment for the $2^{+}_{2}$ state is changed by the $\\alpha$-cluster breaking effect. Namely, in model calculations without the $\\alpha$-cluster breaking effect, the $0^{+}_{2}$ state is assigned to be the band-head of the $2^{+}_{2}$ state. However, when we incorporate $\\alpha$-cluster breaking caused by the spin-orbit force, the $0^{+}_{3}$ state is regarded as the band-head of the $2^{+}_{2}$ state.

  6. Jet Veto Clustering Logarithms Beyond Leading Order

    E-Print Network [OSTI]

    Simone Alioli; Jonathan R. Walsh

    2014-11-23T23:59:59.000Z

    Many experimental analyses separate events into exclusive jet bins, using a jet algorithm to cluster the final state and then veto on jets. Jet clustering induces logarithmic dependence on the jet radius R in the cross section for exclusive jet bins, a dependence that is poorly controlled due to the non-global nature of the clustering. At jet radii of experimental interest, the leading order (LO) clustering effects are numerically significant, but the higher order effects are currently unknown. We rectify this situation by calculating the most important part of the next-to-leading order (NLO) clustering logarithms of R for any 0-jet process, which enter as $O(\\alpha_s^3)$ corrections to the cross section. The calculation blends subtraction methods for NLO calculations with factorization properties of QCD and soft-collinear effective theory (SCET). We compare the size of the known LO and new NLO clustering logarithms and find that the impact of the NLO terms on the 0-jet cross section in Higgs production is small. This brings clustering effects under better control and may be used to improve uncertainty estimates on cross sections with a jet veto.

  7. The Formation History of Globular Clusters

    E-Print Network [OSTI]

    Dean E. McLaughlin

    2000-02-03T23:59:59.000Z

    The properties of old globular cluster systems in galaxy halos are used to infer quantitative constraints on aspects of generic star (cluster) formation. First, the spatial distribution of globulars in three large galaxies, together with trends in total cluster population vs. galaxy luminosity for 97 early-type systems plus the halo of the Milky Way, imply that bound stellar clusters formed with a universal efficiency throughout early protogalaxies: by mass, always 0.26% of star-forming gas was converted into globulars rather than halo field stars. That this fraction is so robust in the face of extreme variations in local and global galaxy environment suggests that any parcel of gas needs primarily to exceed a relative density threshold in order to form a bound cluster of stars. Second, it is shown that a strict, empirical scaling of total binding energy with luminosity and Galactocentric position is a defining equation for a fundamental plane of Galactic globular clusters. The characteristics of this plane, which subsumes all other observable correlations between the structural parameters of globulars, provide a small but complete set of facts that must be explained by theories of cluster formation and evolution in the Milky Way. It is suggested that the E_b(L,r_{\\rm gc}) relation specifically resulted from star formation efficiencies having been systematically higher inside more massive protoglobular gas clumps.

  8. OSLO Workstation Assessment --page 1August 2013 OSLO Workstation Assessment --a general guide

    E-Print Network [OSTI]

    Botea, Adi

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > If symptoms are persisting, please complete an Incident Notification Form at https://policies.anu.edu.au/ppl

  9. Online Spectral Clustering on Network Streams

    E-Print Network [OSTI]

    Jia, Yi

    2012-12-31T23:59:59.000Z

    .3.1 First Order Approximation (FOA) Approach . . . . . . . . . . . . . 109 7.3.2 Eigen Perturbation Theory Based Approaches . . . . . . . . . . . . . 111 7.3.2.1 General Eigen Perturbation Theory (GEPT) Approach . . . 111 7.3.2.2 Enhanced Eigen Perturbation... of an evolving graph with two snapshots . . . . . . . . . . . . . 109 7.2 The clustering results of the evolving graph in Figure 7.1 by using SC-FOA . 110 xi 7.3 The clustering results of the evolving graph in Figure 7.1 by using FOA . . . 111 7.4 The clustering...

  10. Cluster state quantum computing in optical fibers

    E-Print Network [OSTI]

    Yasaman Soudagar; Felix Bussieres; Guido Berlin; Suzanne Lacroix; Jose M. Fernandez; Nicolas Godbout

    2006-05-12T23:59:59.000Z

    A scheme for the implementation of the cluster state model of quantum computing in optical fibers, which enables the feedforward feature, is proposed. This scheme uses the time-bin encoding of qubits. Following previously suggested methods of applying arbitrary one-qubit gates in optical fibers, two different ways for the realization of fusion gate types I and II for cluster production are proposed: a fully time-bin based encoding scheme and a combination of time-bin and polarization based encoding scheme. Also the methods of measurement in any desired bases for the purpose of the processing of cluster state computing for both these encodings are explained.

  11. Method for assaying clustered DNA damages

    DOE Patents [OSTI]

    Sutherland, Betsy M.

    2004-09-07T23:59:59.000Z

    Disclosed is a method for detecting and quantifying clustered damages in DNA. In this method, a first aliquot of the DNA to be tested for clustered damages with one or more lesion-specific cleaving reagents under conditions appropriate for cleavage of the DNA to produce single-strand nicks in the DNA at sites of damage lesions. The number average molecular length (Ln) of double stranded DNA is then quantitatively determined for the treated DNA. The number average molecular length (Ln) of double stranded DNA is also quantitatively determined for a second, untreated aliquot of the DNA. The frequency of clustered damages (.PHI..sub.c) in the DNA is then calculated.

  12. EA-1247: Electrical Power System Upgrades at Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts for the proposal to upgrade the electrical power supply system for the U.S. Department of Energy Los Alamos National Laboratory to increase the...

  13. EIS-0018: Continued Operation of Los Alamos Scientific Laboratory Site, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    The U.S. Department of Energy prepared this statement to assesses the potential cumulative environmental impacts associated with current, known future, and continuing activities at the Los Alamos Scientific Laboratory site.

  14. EA-1131: Relocation of Neutron Tube Target Loading Operation, Los Alamos Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts of the proposal to relocate the Neutron Tube Target Loading operations at the U.S. Department of Energy Los Alamos National Laboratory in New Mexico from...

  15. Food Cluster: A Strategy for Job Growth in North

    E-Print Network [OSTI]

    Minnesota, University of

    with Aeroponics Business Requires low-skill labor Faster production cycle Reduced material & energy costs 16 #12, commercial urban ag. business to anchor the food cluster 3. Find smaller urban farming businesses to serve Cluster Businesses Recommendations 2 #12;Business Clusters Drive Economic Growth · Business Cluster

  16. Secure Two-Party k-Means Clustering Rafail Ostrovsky

    E-Print Network [OSTI]

    Ostrovsky, Rafail

    Secure Two-Party k-Means Clustering Paul Bunn Rafail Ostrovsky Abstract The k-Means Clustering. To date there have been numerous attempts to create specific multiparty k-means clustering protocols a Two-Party k-Means Clustering Protocol that guarantees privacy, and is more efficient than utilizing

  17. Performance impact of dynamic parallelism on different clustering algorithms

    E-Print Network [OSTI]

    Taufer, Michela

    will be measured using two well-known clustering algorithms that exhibit data dependencies: the K-means clustering and the hierarchical clustering. K-means has a sequential data dependence wherein iterations occur in a linear fashion drawbacks of CUDA 5's new dynamic parallelism feature. Keywords: K-means, Divisive hierarchical clustering

  18. Spectral Embedded Clustering Feiping Nie1,2

    E-Print Network [OSTI]

    Xu, Dong

    methods, such as spectral clustering, Clustering with local and global regularization, K-means and Discrimi- native K-means. The experiments on many real- world data sets show that SEC significantly out- performs the existing spectral clustering methods as well as K-means clustering related methods. 1

  19. The globular cluster system of M31

    E-Print Network [OSTI]

    P. Jablonka

    2001-07-17T23:59:59.000Z

    This review presents the current status of our knowledge of M31 star clusters. Given the broadness of the subject, I chose to focus on some of its aspects which are not covered by the other participants in this conference.

  20. Classification and clustering problems in microarray analysis

    E-Print Network [OSTI]

    Tseng, George C. "Chien-Cheng"

    -based · Distance-based 3. Estimating # of clusters 4. Methods & comparison · Hierarchical, K-means, SOM, Tight & comparison · Linear & quadratic discriminant, CART, SVM 3. Gene (feature) selection · Ranking, Recursive

  1. UCD Candidates in the Hydra Cluster

    E-Print Network [OSTI]

    Elizabeth Wehner; William Harris

    2007-08-10T23:59:59.000Z

    NGC 3311, the giant cD galaxy in the Hydra cluster (A1060), has one of the largest globular cluster systems known. We describe new Gemini GMOS (g',i') photometry of the NGC 3311 field which reveals that the red, metal-rich side of its globular cluster population extends smoothly upward into the mass range associated with the new class of Ultra-Compact Dwarfs (UCDs). We identify 29 UCD candidates with estimated masses > 6x10^6 solar masses and discuss their characteristics. This UCD-like sequence is the most well defined one yet seen, and reinforces current ideas that the high-mass end of the globular cluster sequence merges continuously into the UCD sequence, which connects in turn to the E galaxy structural sequence.

  2. Customer Data Clustering using Data Mining Technique

    E-Print Network [OSTI]

    Rajagopal, Dr Sankar

    2011-01-01T23:59:59.000Z

    Classification and patterns extraction from customer data is very important for business support and decision making. Timely identification of newly emerging trends is very important in business process. Large companies are having huge volume of data but starving for knowledge. To overcome the organization current issue, the new breed of technique is required that has intelligence and capability to solve the knowledge scarcity and the technique is called Data mining. The objectives of this paper are to identify the high-profit, high-value and low-risk customers by one of the data mining technique - customer clustering. In the first phase, cleansing the data and developed the patterns via demographic clustering algorithm using IBM I-Miner. In the second phase, profiling the data, develop the clusters and identify the high-value low-risk customers. This cluster typically represents the 10-20 percent of customers which yields 80% of the revenue.

  3. Carbon Fiber Cluster Strategy | ornl.gov

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

    Carbon Fiber Cluster Strategy ORNL has a 40-year history in R&D on fiber-reinforced composite materials, and has been leading DOE's low-cost carbon fiber initiative for more than...

  4. Flagship Cluster Hiring Initiative Computational Science

    E-Print Network [OSTI]

    Allen, Gabrielle

    Flagship Cluster Hiring Initiative Computational Science: Advancing Research, Society and the Economy Gabrielle Allen (PI) Thomas Sterling (Presenter/co-PI) Department of Computer Science Center for Computation & Technology #12;Computational Science: Advancing Research, Society and the Economy, External

  5. Adaptively refined large eddy simulations of clusters

    E-Print Network [OSTI]

    Maier, A; Schmidt, W; Niemeyer, J C

    2009-01-01T23:59:59.000Z

    We present a numerical scheme for modelling unresolved turbulence in cosmological adaptive mesh refinement codes. As a first application, we study the evolution of turbulence in the intra-cluster medium and in the core of a galaxy cluster. Simulations with and without subgrid scale model are compared in detail. Since the flow in the ICM is subsonic, the global turbulent energy contribution at the unresolved length scales is smaller than 1% of the internal energy. We find that the production of turbulence is closely correlated with merger events occurring in the cluster environment, and its dissipation locally affects the cluster energy budget. Because of this additional source of dissipation, the core temperature is larger and the density is smaller in the presence of subgrid scale turbulence than in the standard adiabatic run, resulting in a higher entropy core value.

  6. Gravitational clustering in Static and Expanding Backgrounds

    E-Print Network [OSTI]

    T. Padmanabhan

    2003-08-28T23:59:59.000Z

    A brief summary of several topics in the study of gravitational many body problem is given. The discussion covers both static backgrounds (applicable to astrophysical systems) as well as clustering in an expanding background (relevant for cosmology)

  7. NGC 7789: AN OPEN CLUSTER CASE STUDY

    E-Print Network [OSTI]

    Overbeek, Jamie C.

    We have obtained high-resolution spectra of 32 giants in the open cluster NGC 7789 using the Wisconsin–Indiana–Yale–NOAO Hydra spectrograph. We explore differences in atmospheric parameters and elemental abundances caused ...

  8. Nuclear clusters with Halo Effective Field Theory

    E-Print Network [OSTI]

    Renato Higa

    2008-09-30T23:59:59.000Z

    After a brief discussion of effective field theory applied to nuclear clusters, I present the aspect of Coulomb interactions, with applications to low-energy alpha-alpha and nucleon-alpha scattering.

  9. Shocks and cold fronts in galaxy clusters

    E-Print Network [OSTI]

    Maxim Markevitch; Alexey Vikhlinin

    2007-04-24T23:59:59.000Z

    Table of contents (abridged): COLD FRONTS Origin and evolution of merger cold fronts Cold fronts in cluster cool cores . . . Simulations of gas sloshing. Origin of density discontinuity. . . . Effect of sloshing on cluster mass estimates and cooling flows. Zoology of cold fronts COLD FRONTS AS EXPERIMENTAL TOOL Velocities of gas flows Thermal conduction and diffusion across cold fronts Stability of cold fronts . . . Rayleigh-Taylor instability. Kelvin-Helmholtz instability. Possible future measurements using cold fronts . . . Plasma depletion layer and magnetic field. Effective viscosity of ICM. SHOCK FRONTS AS EXPERIMENTAL TOOL Cluster merger shocks Mach number determination Front width Mach cone and reverse shock? Test of electron-ion equilibrium . . . Comparison with other astrophysical plasmas Shocks and cluster cosmic ray population . . . Shock acceleration. Compression of fossil electrons. . . . Yet another method to measure intracluster magnetic field.

  10. Co-Clustering with Generative Models

    E-Print Network [OSTI]

    Golland, Polina

    2009-11-03T23:59:59.000Z

    In this paper, we present a generative model for co-clustering and develop algorithms based on the mean field approximation for the corresponding modeling problem. These algorithms can be viewed as generalizations of the ...

  11. Photoelectron Spectroscopy of Cold Hydrated Sulfate Clusters...

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

    sulfate clusters SO42-(H2O)n (n ) 4-7) at 12 K and ab initio studies to understand the structures and dynamics of these unique solvated systems. A significant increase of...

  12. Accelerating semantic graph databases on commodity clusters

    SciTech Connect (OSTI)

    Morari, Alessandro; Castellana, Vito G.; Haglin, David J.; Feo, John T.; Weaver, Jesse R.; Tumeo, Antonino; Villa, Oreste

    2013-10-06T23:59:59.000Z

    We are developing a full software system for accelerating semantic graph databases on commodity cluster that scales to hundreds of nodes while maintaining constant query throughput. Our framework comprises a SPARQL to C++ compiler, a library of parallel graph methods and a custom multithreaded runtime layer, which provides a Partitioned Global Address Space (PGAS) programming model with fork/join parallelism and automatic load balancing over a commodity clusters. We present preliminary results for the compiler and for the runtime.

  13. Contribution of White Dwarfs to Cluster Masses

    E-Print Network [OSTI]

    Ted von Hippel

    1998-02-14T23:59:59.000Z

    I present a literature search through 31 July 1997 of white dwarfs (WDs) in open and globular clusters. There are 36 single WDs and 5 WDs in binaries known among 13 open clusters, and 340 single WDs and 11 WDs in binaries known among 11 globular clusters. From these data I have calculated WD mass fractions for four open clusters (the Pleiades, NGC 2168, NGC 3532, and the Hyades) and one globular cluster (NGC 6121). I develop a simple model of cluster evolution that incorporates stellar evolution but not dynamical evolution to interpret the WD mass fractions. I augment the results of my simple model with N-body simulations incorporating stellar evolution (Terlevich 1987; de la Feunte Marcos 1996; Vesperini & Heggie 1997). I find that even though these clusters undergo moderate to strong kinematical evolution the WD mass fraction is relatively insensitive to kinematical evolution. By comparing the cluster mass functions to that of the Galactic disk, and incorporating plausibility arguments for the mass function of the Galactic halo, I estimate the WD mass fraction in these two populations. I assume the Galactic disk is ~10 Gyrs old (Winget et al. 1987; Liebert, Dahn, & Monet 1988; Oswalt et al. 1996) and that the Galactic halo is ~12 Gyrs old (Reid 1997b; Gratton et al. 1997; Chaboyer et al. 1998), although the WD mass fraction is insensitive to age in this range. I find that the Galactic halo should contain 8 to 9% (alpha = -2.35) or perhaps as much as 15 to 17% (alpha = -2.0) of its stellar mass in the form of WDs. The Galactic disk WD mass fraction should be 6 to 7% (alpha = -2.35), consistent with the empirical estimates of 3 to 7% (Liebert, Dahn, & Monet 1988; Oswalt et al. 1996). (abridged)

  14. The Efficiency of Globular Cluster Formation

    E-Print Network [OSTI]

    Dean E. McLaughlin

    1999-01-21T23:59:59.000Z

    (Abridged): The total populations of globular cluster systems (GCSs) are discussed in terms of their connection to the efficiency of globular cluster formation---the mass fraction of star-forming gas that was able to form bound stellar clusters rather than isolated stars or unbound associations---in galaxy halos. Observed variations in GCS specific frequencies (S_N=N_gc/L_gal), both as a function of galactocentric radius in individual systems and globally between entire galaxies, are reviewed in this light. It is argued that trends in S_N do not reflect any real variation in the underlying efficiency of cluster formation; rather, they result from ignoring the hot gas in many large ellipticals. This claim is checked and confirmed in each of M87, M49, and NGC 1399, for which existing data are combined to show that the volume density profile of globular clusters, rho_cl, is directly proportional to the sum of (rho_gas+rho_stars) at large radii. The constant of proportionality is the same in each case: epsilon=0.0026 +/- 0.0005 in the mean. This is identified with the globular cluster formation efficiency. The implication that epsilon might have had a universal value is supported by data on the GCSs of 97 early-type galaxies, on the GCS of the Milky Way, and on the ongoing formation of open clusters. These results have specific implications for some issues in GCS and galaxy formation, and they should serve as a strong constraint on more general theories of star and cluster formation.

  15. Nuclear Forensics at Los Alamos National Laboratory

    SciTech Connect (OSTI)

    Podlesak, David W [Los Alamos National Laboratory; Steiner, Robert E. [Los Alamos National Laboratory; Burns, Carol J. [Los Alamos National Laboratory; LaMont, Stephen P. [Los Alamos National Laboratory; Tandon, Lav [Los Alamos National Laboratory

    2012-08-09T23:59:59.000Z

    The overview of this presentation is: (1) Introduction to nonproliferation efforts; (2) Scope of activities at Los Alamos National Laboratory; (3) Facilities for radioanalytical work at LANL; (4) Radiochemical characterization capabilities; and (5) Bulk chemical and materials analysis capabilities. Some conclusions are: (1) Analytical chemistry measurements on plutonium and uranium matrices are critical to numerous defense and non-defense programs including safeguards accountancy verification measurements; (2) Los Alamos National Laboratory operates capable actinide analytical chemistry and material science laboratories suitable for nuclear material forensic characterization; (3) Actinide analytical chemistry uses numerous means to validate and independently verify that measurement data quality objectives are met; and (4) Numerous LANL nuclear facilities support the nuclear material handling, preparation, and analysis capabilities necessary to evaluate samples containing nearly any mass of an actinide (attogram to kilogram levels).

  16. Los Alamos Team Demonstrates Bottle Scanner Technology

    ScienceCinema (OSTI)

    Espy, Michelle; Schultz, Larry

    2014-06-02T23:59:59.000Z

    Los Alamos scientists are demonstrating a Nuclear Magnetic Resonance Imaging (NMR) technology that may provide a breakthrough for screening liquids at airport security. By adding low-power X-ray data to the NMR mix, scientists believe they have unlocked a new detection technology. Funded in part by the Department of Homeland Security's Science and Technology Directorate, the new technology is called MagRay.

  17. Los Alamos Novel Rocket Design Flight Tested

    ScienceCinema (OSTI)

    Tappan, Bryce

    2015-01-05T23:59:59.000Z

    Los Alamos National Laboratory scientists recently flight tested a new rocket design that includes a high-energy fuel and a motor design that also delivers a high degree of safety. Researchers will now work to scale-up the design, as well as explore miniaturization of the system, in order to exploit all potential applications that would require high-energy, high-velocity, and correspondingly high safety margins.

  18. Amphibians and Reptiles of Los Alamos County

    SciTech Connect (OSTI)

    Teralene S. Foxx; Timothy K. Haarmann; David C. Keller

    1999-10-01T23:59:59.000Z

    Recent studies have shown that amphibians and reptiles are good indicators of environmental health. They live in terrestrial and aquatic environments and are often the first animals to be affected by environmental change. This publication provides baseline information about amphibians and reptiles that are present on the Pajarito Plateau. Ten years of data collection and observations by researchers at Los Alamos National Laboratory, the University of New Mexico, the New Mexico Department of Game and Fish, and hobbyists are represented.

  19. Feedback from Clustered Sources During Reionization

    E-Print Network [OSTI]

    Roban Hultman Kramer; Zoltan Haiman; S. Peng Oh

    2006-04-10T23:59:59.000Z

    The reionization history of the intergalactic medium (IGM) at high redshift (z > 6) was likely strongly shaped by several global feedback processes. Because the earliest ionizing sources formed at the locations of the rare density peaks, their spatial distribution was strongly clustered. Here we demonstrate that this clustering significantly boosts the impact of feedback processes operating at high redshift. We build a semi-analytical model to include feedback and clustering simultaneously, and apply this model to the suppression of star-formation in minihalos due to photoionization. The model is built on the excursion-set-based formalism of Furlanetto, Zaldarriaga and Hernquist (2004), which incorporates the clustering of ionizing sources, and which we here extend to include suppression of star formation in minihalos. We find that clustering increases the mean HII bubble size by a factor of several, and it dramatically increases the fraction of minihalos that are suppressed, by a factor of up to 60 relative to a randomly distributed population. This enhanced suppression can significantly reduce the electron scattering optical depth, as required by the three-year data from the Wilkinson Microwave Anisotropy Probe (WMAP). We argue that source clustering is likely to similarly boost the importance of a variety of other feedback mechanisms.

  20. Cosmological Constraints from Galaxy Cluster Velocity Statistics

    E-Print Network [OSTI]

    Suman Bhattacharya; Arthur Kosowsky

    2007-04-20T23:59:59.000Z

    Future microwave sky surveys will have the sensitivity to detect the kinematic Sunyaev-Zeldovich signal from moving galaxy clusters, thus providing a direct measurement of their line-of-sight peculiar velocity. We show that cluster peculiar velocity statistics applied to foreseeable surveys will put significant constraints on fundamental cosmological parameters. We consider three statistical quantities that can be constructed from a cluster peculiar velocity catalog: the probability density function, the mean pairwise streaming velocity, and the pairwise velocity dispersion. These quantities are applied to an envisioned data set which measures line-of-sight cluster velocities with normal errors of 100 km/s for all clusters with masses larger than $10^{14}$ solar masses over a sky area of up to 5000 square degrees. A simple Fisher matrix analysis of this survey shows that the normalization of the matter power spectrum and the dark energy equation of state can be constrained to better than 10 percent, and the Hubble constant and the primordial power spectrum index can be constrained to a few percent, independent of any other cosmological observations. We also find that the current constraint on the power spectrum normalization can be improved by more than a factor of two using data from a 400 square degree survey and WMAP third-year priors. We also show how the constraints on cosmological parameters changes if cluster velocities are measured with normal errors of 300 km/s.

  1. Free floating planets in stellar clusters?

    E-Print Network [OSTI]

    Kester W. Smith; Ian A. Bonnell

    2001-01-05T23:59:59.000Z

    We have simulated encounters between planetary systems and single stars in various clustered environments. This allows us to estimate the fraction of systems liberated, the velocity distribution of the liberated planets, and the separation and eccentricity distributions of the surviving bound systems. Our results indicate that, for an initial distribution of orbits that is flat in log space and extends out to 50AU, 50% of the available planets can be liberated in a globular cluster, 25% in an open cluster, and less than 10% in a young cluster. These fractions are reduced to 25%, 12% and 2% if the initial population extends only to 20AU. Furthermore, these free-floating planets can be retained for longer than a crossing time only in a massive globular cluster. It is therefore difficult to see how planets, which by definition form in a disc around a young star, could be subsequently liberated to form a significant population of free floating substellar objects in a cluster.

  2. Electron attenuation in free, neutral ethane clusters

    SciTech Connect (OSTI)

    Winkler, M.; Harnes, J.; Børve, K. J., E-mail: Knut.Borve@kj.uib.no [Department of Chemistry, University of Bergen, NO-5007 Bergen (Norway); Myrseth, V. [Department of Physics and Technology, University of Bergen, NO-5007 Bergen (Norway)

    2014-10-28T23:59:59.000Z

    The electron effective attenuation length (EAL) in free, neutral ethane clusters has been determined at 40 eV kinetic energy by combining carbon 1s x-ray photoelectron spectroscopy and theoretical lineshape modeling. More specifically, theory is employed to form model spectra on a grid in cluster size (N) and EAL (?), allowing N and ? to be determined by optimizing the goodness-of-fit ?{sup 2}(N, ?) between model and observed spectra. Experimentally, the clusters were produced in an adiabatic-expansion setup using helium as the driving gas, spanning a range of 100–600 molecules in mean cluster size. The effective attenuation length was determined to be 8.4?±?1.9 Å, in good agreement with an independent estimate of 10 Å formed on the basis of molecular electron-scattering data and Monte Carlo simulations. The aggregation state of the clusters as well as the cluster temperature and its importance to the derived EAL value are discussed in some depth.

  3. Off-Center Mergers of Clusters of Galaxies and Nonequipartition of Electrons and Ions in Intracluster Medium

    E-Print Network [OSTI]

    Motokazu Takizawa

    1999-10-25T23:59:59.000Z

    We investigate the dynamical evolution of clusters of galaxies and their observational consequences during off-center mergers, explicitly considering the relaxation process between ions and electrons in intracluster medium by N-body and hydrodynamical simulations. In the contracting phase a bow shock is formed between the two subclusters. The observed temperature between two peaks in this phase depends on the viewing angle even if the geometry of the system seems to be very simple like head-on collisions. Around the most contracting epoch, when we observe merging clusters nearly along the collision axis, they look like spherical relaxed clusters with large temperature gradients. In the expanding phase, spiral bow shocks occur. As in head-on mergers, the electron temperature is significantly lower than the plasma mean one especially in the post-shock regions in the expanding phase. When the systems have relatively large angular momentum, double-peak structures in the X-ray images can survive even after the most contracting epoch. Morphological features in both X-ray images and electron temperature distribution characteristic to off-center mergers are seriously affected by the viewing angle. When the clusters are observed nearly along the collision axis, the distribution of galaxies' line-of-sight (LOS) velocities is a good indicator of mergers. In the contracting phase, an negative kurtosis and a large skewness are expected for nearly equal mass collisions and rather different mass ones, respectively. To obtain statistically significant results, about 1000 galaxies' LOS velocities are required. For nearby clusters ($z<0.05$), large redshift surveys such as 2dF will enable us to study merger dynamics.

  4. Nuclear Arms Control R&D Consortium includes Los Alamos

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

    Nuclear Arms Control R&D Consortium includes Los Alamos Nuclear Arms Control R&D Consortium includes Los Alamos A consortium led by the University of Michigan that includes LANL as...

  5. Preliminary Notice of Violation, Los Alamos National Security...

    Office of Environmental Management (EM)

    0-04 Preliminary Notice of Violation, Los Alamos National Security, LLC - WEA-2010-04 October 18, 2010 Preliminary Notice of Violation issued to Los Alamos National Security, LLC...

  6. Preliminary Notice of Violation, Los Alamos National Security...

    Energy Savers [EERE]

    Preliminary Notice of Violation, Los Alamos National Security, LLC - WEA-2012-03 Preliminary Notice of Violation, Los Alamos National Security, LLC - WEA-2012-03 October 17, 2012...

  7. Unusual light in dark space revealed by Los Alamos, NASA

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

    Unusual light in dark space revealed by Los Alamos, NASA Unusual light in dark space revealed by Los Alamos, NASA By looking at the dark spaces between visible galaxies and stars...

  8. CRAD, Quality Assurance - Los Alamos National Laboratory TA 55...

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

    Quality Assurance - Los Alamos National Laboratory TA 55 SST Facility CRAD, Quality Assurance - Los Alamos National Laboratory TA 55 SST Facility A section of Appendix C to DOE G...

  9. "Rolling Stone" covers climate change research at Los Alamos...

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

    News "Rolling Stone" covers climate change research at Los Alamos Lab "Rolling Stone" covers climate change research at Los Alamos Lab By the end of the century, the woodlands...

  10. A populous intermediate-age open cluster and evidence of an embedded cluster among the FSR globular cluster candidates

    E-Print Network [OSTI]

    Bica, Eduardo

    2007-01-01T23:59:59.000Z

    We study the nature of the globular cluster (GC) candidates FSR 1603 and FSR 1755 selected from the catalogue of \\citet{FSRcat}. Their properties are investigated with 2MASS field-star decontaminated photometry, which is used to build colour-magnitude diagrams (CMDs), and stellar radial density profiles (RDPs). FSR 1603 has the open cluster (OC) Ruprecht 101 as optical counterpart, and we show it to be a massive intermediate age cluster (IAC). Relevant parameters of FSR 1603 are the age $\\approx1$ Gyr, distance from the Sun $\\ds\\approx2.7$ kpc, Galactocentric distance $\\dgc\\approx6.4$ kpc, core radius $\\rc\\approx1.1$ pc, mass function slope $\\chi\\approx1.8$, observed stellar mass (for stars with mass in the range $\\rm 1.27 \\ms\\leq m\\leq2.03 \\ms$) $\\mObs\\approx500 \\ms$, and a total (extrapolated to $\\rm m=0.08 \\ms$) stellar mass $\\mTot\\approx2300 \\ms$. FSR 1755, on the other hand, is not a populous cluster. It may be a sparse young cluster embedded in the H II region Sh2-3, subject to an absorption $\\aV\\approx...

  11. ASSOCIATION RULES OF DCI PATIENT CLUSTERS AND RELIABILITY OF CLUSTERING ANALYSIS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    work:. K-Means Algorithm The k-means method is a widely used geometric clustering algorithm based is guaranteed to terminate. The k-means method is still very popular today, and it has been applied in a wide of the k-means algorithm is the necessity to specify the number of clusters. COBWEB Algorithm Unlike the k-means

  12. Keck Spectroscopy of Globular Clusters in the Virgo Cluster Dwarf Elliptical VCC 1386

    E-Print Network [OSTI]

    Christopher J. Conselice

    2005-11-01T23:59:59.000Z

    We present the results of a Keck spectroscopic study of globular clusters associated with the Virgo Cluster dwarf elliptical VCC 1386. We analyze blue spectroscopic absorption lines from 3500-5500 A for 13 globular cluster candidates and confirm that five are associated with VCC 1386. By comparing metal and Balmer line indices of these globular clusters with alpha-enhanced single stellar population models we find that these systems are metal poor with [Fe/H] 5 Gyr at 3 sigma confidence, placing their formation at z >1. This is one of the first spectroscopic studies of globular clusters surrounding dwarfs in a cluster, revealing that some low mass galaxies in rich environments form at least part of their stellar mass early in the history of the universe. We further find that the luminosity weighted stellar population of VCC 1386 itself is younger, and more metal rich than its globular clusters, consistent with (V-I)_0 colors from Hubble Space Telescope imaging. This implies that VCC 1386, like Local Group dEs, has had multiple episodes of star formation. Globular clusters associated with low luminosity systems however appear to be roughly as old as those associated with giant galaxies, contrary to the `downsizing' formation of their bulk stellar populations.

  13. Magnetospheric line radiation event observed simultaneously on board Cluster 1, Cluster 2 and DEMETER spacecraft

    E-Print Network [OSTI]

    Santolik, Ondrej

    be related to power line harmonic radiation (PLHR, an electromagnetic radiation from electric power systemsMagnetospheric line radiation event observed simultaneously on board Cluster 1, Cluster 2., O. Santolík, M. Parrot, and J. S. Pickett (2012), Magnetospheric line radiation event observed

  14. CRAD, Engineering - Los Alamos National Laboratory Waste Characterizat...

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

    Laboratory Waste Characterization, Reduction, and Repackaging Facility CRAD, Engineering - Los Alamos National Laboratory Waste Characterization, Reduction, and Repackaging...

  15. Voluntary Protection Program Onsite Review, Los Alamos Operations- November 2011

    Broader source: Energy.gov [DOE]

    Evaluation to determine whether Los Alamos Operations is continuing to perform at a level deserving DOE-VPP Star recognition.

  16. Los Alamos National Laboratory Issue 1 June 2014

    E-Print Network [OSTI]

    Berkeley, Pacific Northwest, Savannah River, and Los Alamos national laboratories at the Savannah RiverLos Alamos National Laboratory Issue 1 · June 2014 RESEARCH QUARTERLY Th 90 Ac 89 Pa 91 U 92 Np 93 Institute Los Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated

  17. Las personas con diabetes deben lograr un balance entre los

    E-Print Network [OSTI]

    la planeación de las comidas y la selección de los ali- mentos. El método 50/50 brinda un balance% (la mitad) de porciones de ali- mentos bajos en carbohidratos. Los grupos de alimentos que contienen en un lado del plato y los alimentos bajos en carbohidratos al otro lado. Karen Halderson, MPH, RD

  18. Agglomerative Connectivity Constrained Clustering for Image Segmentation We consider the problem of clustering under the constraint that data points in the same cluster

    E-Print Network [OSTI]

    Li, Jia

    for images with large sizes, the segmentation algorithm combines the top-down k-means clustering constrained clustering, agglomerative clustering, image segmentation, k-means 1 Introduction Research efforts at multiple stages through which the similarity measure is adjusted. Experimental results with comparison

  19. GALAXY CLUSTER BULK FLOWS AND COLLISION VELOCITIES IN QUMOND

    SciTech Connect (OSTI)

    Katz, Harley; McGaugh, Stacy; Teuben, Peter [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Angus, G. W., E-mail: hkatz@astro.umd.edu, E-mail: stacy.mcgaugh@case.edu, E-mail: teuben@astro.umd.edu, E-mail: angus.gz@gmail.com [Astrophysics, Cosmology and Gravity Centre, University of Cape Town, Private Bag X3, Rondebosch 7700 (South Africa)

    2013-07-20T23:59:59.000Z

    We examine the formation of clusters of galaxies in numerical simulations of a QUMOND cosmogony with massive sterile neutrinos. Clusters formed in these exploratory simulations develop higher velocities than those found in {Lambda}CDM simulations. The bulk motions of clusters attain {approx}1000 km s{sup -1} by low redshift, comparable to observations whereas {Lambda}CDM simulated clusters tend to fall short. Similarly, high pairwise velocities are common in cluster-cluster collisions like the Bullet Cluster. There is also a propensity for the most massive clusters to be larger in QUMOND and to appear earlier than in {Lambda}CDM, potentially providing an explanation for ''pink elephants'' like El Gordo. However, it is not obvious that the cluster mass function can be recovered.

  20. THE FORMATION OF YOUNG DENSE STAR CLUSTERS THROUGH MERGERS

    SciTech Connect (OSTI)

    Fujii, M. S.; Portegies Zwart, S. F. [Leiden Observatory, Leiden University, NL-2300RA Leiden (Netherlands); Saitoh, T. R. [Interactive Research Center of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551 (Japan)

    2012-07-01T23:59:59.000Z

    Young star clusters such as NGC 3603 and Westerlund 1 and 2 in the Milky Way and R136 in the Large Magellanic Cloud are dynamically more evolved than expected based on their current relaxation times. In particular, the combination of a high degree of mass segregation, a relatively low central density, and the large number of massive runaway stars in their vicinity are hard to explain with the monolithic formation of these clusters. Young star clusters can achieve such a mature dynamical state if they formed through the mergers of a number of less massive clusters. The shorter relaxation times of less massive clusters cause them to dynamically evolve further by the time they merge, and the merger product preserves the memory of the dynamical evolution of its constituent clusters. With a series of N-body simulations, we study the dynamical evolution of single massive clusters and those that are assembled through merging smaller clusters together. We find that the formation of massive star clusters through the mergers of smaller clusters can reproduce the currently observed spatial distribution of massive stars, the density, and the characteristics (number and mass distribution) of the stars ejected as runaways from young dense clusters. We therefore conclude that these clusters and possibly other young massive star clusters formed through the mergers of smaller clusters.

  1. EA-1410: Proposed Disposition of the Omega West Facility at Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts for the proposal to remove the Omega West Facility and the remaining support structures from Los Alamos Canyon at the U.S. Department of Energy Los...

  2. EA-0969: Low Energy Accelerator Laboratory Technical Area 53 Los Alamos National Laboratory, Los Alamos, New Mexico

    Broader source: Energy.gov [DOE]

    This EA evaluates the environmental impacts of the U.S. Department of Energy's Los Alamos National Laboratory in Los Alamos, New Mexico to construct and operate a small research and development...

  3. Bayesian Model-Based Clustering Procedures John W. LAU and Peter J. GREEN

    E-Print Network [OSTI]

    Xu, Xinyi

    of classical approaches, such as hierarchical clustering and K-means clustering procedures, Bayesian a comparison of the statistical performance of the (approximate) optimal clustering with earlier methods

  4. Time Resolved Photoelectron Imaging of Electronic Relaxation Dynamics in Anionic Clusters

    E-Print Network [OSTI]

    Griffin, Graham Bailey

    2009-01-01T23:59:59.000Z

    Solvation in Iodide-Doped Acetonitrile Clusters, Journal ofSolvation in Iodide-doped Acetonitrile Clusters [ReprintedSolvation in Iodide- doped Acetonitrile Clusters", Oli T.

  5. Los Alamos National Laboratory computer benchmarking, 1983

    SciTech Connect (OSTI)

    Griffin, J.H.; Simmons, M.L.

    1984-06-01T23:59:59.000Z

    Evaluating the performance of computing machinery is an ongoing effort of the Computer Research and Applications Group of the Los Alamos National Laboratory. This report summarizes the results of benchmarking activities performed between October 1982 and September 1983. Compilation and execution times as well as megaflop rates for a set of benchmark codes are reported. Tests were performed on the following computers: Cray Research, Inc. (CRI) Cray-1S; Control Data Corporation (CDC) 7600, Cyber 825, and Cyber 205; Digital Equipment Corporation (DEC) VAX 11/780 and VAX 11/782.

  6. Los Alamos County | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:Landowners andLodgepole, Nebraska:LongboardLoretto, Minnesota:Los Alamos

  7. Los Azufres Geothermal Plant | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:Landowners andLodgepole, Nebraska:LongboardLoretto,Los AngelesAngeles)

  8. Transitioning Los Alamos technology into the marketplace

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron Spin Transition in2, 2003Tool ofTopoCarbon| DepartmentTransitioning Los

  9. Los Alamos National Laboratory passive solar program

    SciTech Connect (OSTI)

    Neeper, D.A.

    1981-01-01T23:59:59.000Z

    Progress in passive solar tasks performed at the Los Alamos National Laboratory for FY-81 is documented. A third volume of the Passive Solar Design Handbook is nearly complete. Twenty-eight configurations of sunspaces were studied using the solar load ratio method of predicting performance; the configuration showing best performance is discussed. The minimum level of insolation needed to generate convective flow in the thermosiphon test rig is noted and measured. Information is also included on test room performance, off-peak auxiliary electric heating for a passive home, free convection experiment, monitored buildings, and technical support to the US Department of Energy.

  10. Los Alamos National Laboratory | 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 DataDepartment of Energy Your Density Isn't YourTransport(FactDepartment ofLetterEconomy andTerms Loan TermsLongLorettaEnvironmental WorkLos

  11. LOS ALAMOS NATIONAL LABORATORY STRATEGIC PLAN 2014

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your Home asLCLS Experimental Run SchedulesLNG Technology IsLOS

  12. Los Alamos Lab: Environmental Physical Sciences, ADEPS

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLooking northeastLos Alamos Lab

  13. Los Alamos Lab: National Security Office: Homepage

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is Your HomeLatestCenterLogging inLooking northeastLos

  14. Los Alamos National Laboratory sponsors Hazmat Challenge

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwards PollutionPollutionenvironmentalLos AlamosHazmat

  15. LOS ALAMOS NATIONAL LABORATORY COMMUNITY LEADERS SURVEY

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,s - 1 2 3 4 5 6BOE ReserveLOS ALAMOS

  16. Los Alamos Public Schools recommended for accreditation

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests in Santa FeLANS,Los Alamos

  17. Los Alamos STEM Challenge registration now open

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests in Santa FeLANS,Los

  18. Los Alamos Science in the News

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests in Santa FeLANS,LosNews

  19. Los National Alamos Lab: Connections Newsletter

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8,XL30TecnaiCommunity

  20. Clean Cities: Los Angeles Clean Cities coalition

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i t z CPlasma0 12Denver MetroHonolulu CleanIowaLandLongLos

  1. Clean Tech Los Angeles | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof EnergyInnovationin UrbanCity ofCityClean Economy Network JumpClean Fuels OhioLos

  2. National Security Science | Los National Alamos Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible for Renewable Energy:Nanowire Solar EnergyKambaraorRENEWABLE ENERGYSecurityJuly 2014Los

  3. Los Alamos exceeds waste shipping goal

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwardspublicexceeds waste shipping goal Los Alamos

  4. Los Alamos exceeds waste shipping goal

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |Is YourAwardspublicexceeds waste shipping goal Los

  5. CEPPAD, CAMMICE, and RAPID (CCR) Data from Los Alamos National Laboratory (LANL)

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

    The Comprehensive Energetic Particle and Pitch Angle Distribution (CEPPAD) Experiment, the Charge and Mass Magnetospheric Ion Composition Experiment (CAMMICE), and the experiment for Research with Adaptive Particle Imaging Detectors (RAPID) refer to specific instruments mounted on the Polar satellite launched by NASA in February of 1996 and the Cluster II spacecraft launched in 2000 under the auspices of the European Space Operations Centre (ESOC), Germany. All three instruments are participating in the International Solar Terrestrial Physics Program (ISTP), to which the Global Geospace Science Program (GGSP) is the U.S. contribution. The CCR Science Team is composed of members of three instrument teams on the ISTP satellites POLAR and CLUSTER. DOE's Los Alamos National Laboratory is part of that team, and the CCR website is maintained at LANL. CCR Summary Data Plots are available from the LANL website through either the specialized browser or as digitized data from an anonymous FTP. ISTP data of various kinds can be obtained from NASA at http://pwg.gsfc.nasa.gov/istp/

  6. Detonation of Meta-stable Clusters

    SciTech Connect (OSTI)

    Kuhl, Allen; Kuhl, Allen L.; Fried, Laurence E.; Howard, W. Michael; Seizew, Michael R.; Bell, John B.; Beckner, Vincent; Grcar, Joseph F.

    2008-05-31T23:59:59.000Z

    We consider the energy accumulation in meta-stable clusters. This energy can be much larger than the typical chemical bond energy (~;;1 ev/atom). For example, polymeric nitrogen can accumulate 4 ev/atom in the N8 (fcc) structure, while helium can accumulate 9 ev/atom in the excited triplet state He2* . They release their energy by cluster fission: N8 -> 4N2 and He2* -> 2He. We study the locus of states in thermodynamic state space for the detonation of such meta-stable clusters. In particular, the equilibrium isentrope, starting at the Chapman-Jouguet state, and expanding down to 1 atmosphere was calculated with the Cheetah code. Large detonation pressures (3 and 16 Mbar), temperatures (12 and 34 kilo-K) and velocities (20 and 43 km/s) are a consequence of the large heats of detonation (6.6 and 50 kilo-cal/g) for nitrogen and helium clusters respectively. If such meta-stable clusters could be synthesized, they offer the potential for large increases in the energy density of materials.

  7. Globular cluster luminosity function as distance indicator

    E-Print Network [OSTI]

    Rejkuba, M

    2012-01-01T23:59:59.000Z

    Globular clusters are among the first objects used to establish the distance scale of the Universe. In the 1970-ies it has been recognized that the differential magnitude distribution of old globular clusters is very similar in different galaxies presenting a peak at M_V ~ -7.5. This peak magnitude of the so-called Globular Cluster Luminosity Function has been then established as a secondary distance indicator. The intrinsic accuracy of the method has been estimated to be of the order of ~0.2 mag, competitive with other distance determination methods. Lately the study of the Globular Cluster Systems has been used more as a tool for galaxy formation and evolution, and less so for distance determinations. Nevertheless, the collection of homogeneous and large datasets with the ACS on board HST presented new insights on the usefulness of the Globular Cluster Luminosity Function as distance indicator. I discuss here recent results based on observational and theoretical studies, which show that this distance indica...

  8. Clustering of Aerosols in Atmospheric Turbulent Flow

    E-Print Network [OSTI]

    T. Elperin; N. Kleeorin; M. A. Liberman; V. L'vov; I. Rogachevskii

    2007-02-15T23:59:59.000Z

    A mechanism of formation of small-scale inhomogeneities in spatial distributions of aerosols and droplets associated with clustering instability in the atmospheric turbulent flow is discussed. The particle clustering is a consequence of a spontaneous breakdown of their homogeneous space distribution due to the clustering instability, and is caused by a combined effect of the particle inertia and a finite correlation time of the turbulent velocity field. In this paper a theoretical approach proposed in Phys. Rev. E 66, 036302 (2002) is further developed and applied to investigate the mechanisms of formation of small-scale aerosol inhomogeneities in the atmospheric turbulent flow. The theory of the particle clustering instability is extended to the case when the particle Stokes time is larger than the Kolmogorov time scale, but is much smaller than the correlation time at the integral scale of turbulence. We determined the criterion of the clustering instability for the Stokes number larger than 1. We discussed applications of the analyzed effects to the dynamics of aerosols and droplets in the atmospheric turbulent flow.

  9. Globular Cluster Ages and Stromgren CCD Photometry

    E-Print Network [OSTI]

    Frank Grundahl

    1999-09-23T23:59:59.000Z

    Stromgren uvby CCD photometry can be used in a variety of ways to constrain the absolute and relative ages of globular clusters. The reddening corrected (v-y, c1) diagram offers the means to derive ages that are completely independent of distance. Very precise differential ages for clusters of the same chemical composition may also be determined from such 2-color plots, or from measurements of the magnitude difference, Delta_u, between the subgiant and horizontal branches on the $u-y, u$ plane (where both of these features are flat and well-defined, even for clusters like M13 that have extremely blue HBs on the (B-V, V) diagram). Based on high-quality photometry we find that: (1) M92 is 15 Gyr old, (2) M3 and M13 differ in age by < 1 Gyr, and (3) NGC 288, NGC 362, and NGC 1851 are coeval to within ~1.5 Gyr. These results strongly suggest that age cannot be the only ``second parameter''. Finally, we suggest that the observed variations in c1 among giant branch stars in all the metal-poor clusters that we have studied so far are likely due to star-to-star C and N abundance variations, and potentially indicate that most (if not all) globular clusters have ``primordial'' variations in at least these elements.

  10. Heating Rate Profiles in Galaxy Clusters

    E-Print Network [OSTI]

    Edward C. D. Pope; Georgi Pavlovski; Christian R. Kaiser; Hans Fangohr

    2006-01-05T23:59:59.000Z

    In recent years evidence has accumulated suggesting that the gas in galaxy clusters is heated by non-gravitational processes. Here we calculate the heating rates required to maintain a physically motived mass flow rate, in a sample of seven galaxy clusters. We employ the spectroscopic mass deposition rates as an observational input along with temperature and density data for each cluster. On energetic grounds we find that thermal conduction could provide the necessary heating for A2199, Perseus, A1795 and A478. However, the suppression factor, of the clasical Spitzer value, is a different function of radius for each cluster. Based on the observations of plasma bubbles we also calculate the duty cycles for each AGN, in the absence of thermal conduction, which can provide the required energy input. With the exception of Hydra-A it appears that each of the other AGNs in our sample require duty cycles of roughly $10^{6}-10^{7}$ yrs to provide their steady-state heating requirements. If these duty cycles are unrealistic, this may imply that many galaxy clusters must be heated by very powerful Hydra-A type events interspersed between more frequent smaller-scale outbursts. The suppression factors for the thermal conductivity required for combined heating by AGN and thermal conduction are generally acceptable. However, these suppression factors still require `fine-tuning` of the thermal conductivity as a function of radius. As a consequence of this work we present the AGN duty cycle as a cooling flow diagnostic.

  11. Clusters and halos in light nuclei

    E-Print Network [OSTI]

    Thomas Neff

    2012-10-15T23:59:59.000Z

    The fermionic molecular dynamics approach uses Gaussian wave packets as single-particle basis states. Many-body basis states are Slater determinants projected on parity, angular momentum and total linear momentum. The wave-packet basis is very flexible - FMD contains harmonic oscillator shell model and Brink-type cluster states as special cases. The parameters of the wave packets are obtained by variation. A realistic effective interaction derived from the Argonne V18 interaction by means of the unitary correlation operator method is employed. We discuss the fully microscopic calculation of the 3He(alpha,gamma)7Be capture reaction within the FMD approach. The model space contains frozen cluster configurations at large distances and polarized configurations in the interaction region. The polarized configurations are essential for a successful description of the 7Be bound state properties and for the S- and D-wave scattering states. The calculated cross section agrees well with recent measurements regarding both the absolute normalization and the energy dependence. We also discuss the structure of the cluster states, including the famous Hoyle state, in 12C. From the two-body densities we conclude that the Hoyle state has a spatially extended triangular alpha-cluster structure, whereas the third 0+ state features a chain-like obtuse triangle structure. We also calculate the N hbar Omega decomposition of our wave functions to illuminate the challenges of no-core shell model calculations for these cluster states.

  12. Angular clustering in the SUMSS radio survey

    E-Print Network [OSTI]

    Chris Blake; Tom Mauch; Elaine M. Sadler

    2003-10-05T23:59:59.000Z

    We measure the angular correlation function of radio galaxies selected by the 843 MHz Sydney University Molonglo Sky Survey (SUMSS). We find that the characteristic imprint of large-scale structure is clearly detectable, and that the survey is very uniform. Through comparison with similar analyses for other wide-area radio surveys - the 1400 MHz NRAO VLA Sky Survey (NVSS) and the 325 MHz Westerbork Northern Sky Survey (WENSS) - we are able to derive consistent angular clustering parameters, including a steep slope for the clustering function, $w(\\theta) \\propto \\theta^{-1.1}$. We revise upwards previous estimates of the NVSS clustering amplitude, and find no evidence for dependence of clustering properties on radio frequency. It is important to incorporate the full covariance matrix when fitting parameters to the measured correlation function. Once the redshift distribution for mJy radio galaxies has been determined, these projected clustering measurements will permit a robust description of large-scale structure at $z \\sim 0.8$, the median redshift of the sources.

  13. Confirming EIS Clusters. Multi-object Spectroscopy

    E-Print Network [OSTI]

    A. Biviano; M. Ramella; W. Boschin; S. Bardelli; M. Scodeggio; L. N. da Costa; L. F. Olsen; M. Nonino; S. Borgani; M. Girardi

    1999-10-26T23:59:59.000Z

    Using EFOSC2 at the 3.6m ESO telescope, we obtained redshifts for 68 galaxies in the field of six cluster candidates from the ESO Imaging Survey (EIS). The cluster candidates were selected in the EIS patches C and D and have estimated mean redshifts between z=0.5 and z=0.7. In the six candidate cluster fields, we identify possible systems of galaxies in the redshift space. The likelihoods of these systems are established by comparison with random resamplings of the Canada-France Redshift Surveys, and using the redshift distribution expected from Postman et al.'s luminosity function, with Poggianti's K- and evolutionary-corrections. Four of the six candidate EIS clusters are found to correspond to a real system in the redshift space, with > 95 % probability. Two of them have a mean redshift in agreement with the estimate from the matched filter algorithm, while the other two have a significantly smaller redshift. The independent analysis of the V-I vs. I color-magnitude diagrams for five of our six cluster fields, supports our conclusions based on the spectroscopic data.

  14. Los Alamos, New Mexico, December 14, 2009-Los Alamos National Laboratory

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8, 2014 LosUnusual

  15. Los Alamos, New Mexico, July 21, 2009- Los Alamos National Laboratory scientists

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5LetLooking5invests inLos8, 2014 LosUnusualsnags

  16. Housing Payment Information Los estudiantes son responsables de hacer el pago de los gastos de vivienda en o

    E-Print Network [OSTI]

    Barrett, Jeffrey A.

    Housing Payment Information Los estudiantes son responsables de hacer el pago de los gastos de Oficina de Ayuda Financiera para averiguar si su beca cubre los gastos de vivienda. Student Housing Accounts Counselor (949) 824-6811 shac@uci.edu www.housing.uci.edu/payment.asp Si usted no puede cumplir

  17. Multi-object spectroscopy of low redshift EIS clusters. I

    E-Print Network [OSTI]

    L. Hansen; L. F. Olsen; H. E. Jorgensen

    2002-04-23T23:59:59.000Z

    We report the results of the first multi-object spectroscopic observations at the Danish 1.54m telescope at La Silla, Chile. Observations of five cluster candidates from the ESO Imaging Survey Cluster Candidate Catalog are described. From these observations we confirm the reality of the five clusters with measured redshifts of 0.11<=z<=0.35. We estimate velocity dispersions in the range 294-621km/s indicating rather poor clusters. This, and the measured cluster redshifts are consistent with the results of the matched filter procedure applied to produce the Cluster Candidate Catalog.

  18. Nonlinear Gravitational Clustering in Expanding Universe

    E-Print Network [OSTI]

    T. Padmanabhan

    1996-07-19T23:59:59.000Z

    The gravitational clustering of collisionless particles in an expanding universe is modelled using some simple physical ideas. I show that it is possible to understand the nonlinear clustering in terms of three well defined regimes: (1) linear regime; (2) quasilinear regime which is dominated by scale-invariant radial infall and (3) nonlinear regime dominated by nonradial motions and mergers. Modelling each of these regimes separately I show how the nonlinear two point correlation function can be related to the linear correlation function in hierarchical models. This analysis leads to results which are in good agreement with numerical simulations thereby providing an explanation for numerical results. Using this model and some simple extensions, it is possible to understand the transfer of power from large to small scales and the behaviour of higher order correlation functions. The ideas presented here will also serve as a powerful analytical tool to investigate nonlinear clustering in different models.

  19. The double galaxy cluster Abell 2465 - II. Star formation in the cluster

    E-Print Network [OSTI]

    Wegner, Gary A; Hwang, Ho Seong

    2014-01-01T23:59:59.000Z

    We investigate the star formation rate and its location in the major merger cluster Abell 2465 at $z$ = 0.245. Optical properties of the cluster are described in Paper I. Measurements of the H$\\alpha$ and infrared dust emission of galaxies in the cluster were made with an interference filter centred on the redshifted line at a wavelength of 817 nm and utilized data from the WISE satellite 12 $\\mu$m band. Imaging in the Johnson $U$ and $B$ bands was obtained, and along with SDSS $u$ and $r$ was used to study the blue fraction, which appears enhanced, as a further signatures of star formation in the cluster. Star formation rates were calculated using standard calibrations. The total star formation rate normalized by the cluster mass, $\\Sigma SFR/M_{cl}$ compared to compilations for other clusters indicate that the components of Abell 2465 lie above the mean $z$ and $M_{cl}$ relations, suggestive that interacting galaxy clusters have enhanced star formation. The projected radial distribution of the star forming ...

  20. Multi-object spectroscopy of low redshift EIS clusters. III. Properties of optically selected clusters

    E-Print Network [OSTI]

    L. F. Olsen; C. Benoist; L. da Costa; L. Hansen; H. E. Jorgensen

    2005-02-25T23:59:59.000Z

    We have carried out an investigation of the properties of low redshift EIS clusters using both spectroscopy and imaging data. We present new redshifts for 738 galaxies in 21 ESO Imaging Survey (EIS) Cluster fields. We use the ``gap''-technique to search for significant overdensities in redshift space and to identify groups/clusters of galaxies corresponding to the original EIS matched filter cluster candidates. In this way we spectroscopically confirm 20 of the 21 cluster candidates with a matched-filter estimated redshift z_MF=0.2. We have now obtained spectroscopic redshifts for 34 EIS cluster candidates with z_MF=0.2 (see also Hansen et al., 2002; Olsen et al., 2003). Of those we spectroscopically confirm 32 with redshifts ranging from z=0.064 to 0.283. We find that: 1) the velocity dispersions of the systems range from sigma_v<=130km/s to sigma_v=1200km/s, typical of galaxy groups to rich clusters; 2) richnesses corresponding to Abell classes R<=1; and 3) concentration indices ranging from C=0.2 to C=1.2. From the analysis of the colours of the galaxy populations we find that 53% of the spectroscopically confirmed systems have a ``significant'' red sequence. These systems are on average richer and have higher velocity dispersions. We find that the colour of the red sequence galaxies matches passive stellar evolution predictions.

  1. Municipal Consortium LED Street Lighting Workshop: April 19–20, Los Angeles, CA

    Broader source: Energy.gov [DOE]

    Workshop Location: The Sheraton Los Angeles Downtown Hotel, 711 Hope Street, Los Angeles, CA 90017City Partner: City of Los Angeles Bureau of Street LightingCost: $175

  2. Dynamic cluster-scaling in DNA

    E-Print Network [OSTI]

    A. Bershadskii

    2010-08-07T23:59:59.000Z

    It is shown that the nucleotide sequences in DNA molecules have cluster-scaling properties (discovered for the first time in turbulent processes: Sreenivasan and Bershadskii, 2006, J. Stat. Phys., 125, 1141-1153.). These properties are relevant to both types of nucleotide pair-bases interactions: hydrogen bonds and stacking interactions. It is shown that taking into account the cluster-scaling properties can help to improve heterogeneous models of the DNA dynamics. Two human genes: BRCA2 and NRXN1, have been considered as examples.

  3. Autoregressive clustering for HMM speech synthesis

    E-Print Network [OSTI]

    Shannon, Matt; Byrne, William

    2010-09-27T23:59:59.000Z

    -estimation formulae used to compute updated parameter values given the state occupancies ?q(t) obtained us- ing the Forward-Backward algorithm [10]. Defining a dummy summarizer f i0(t) , cit for notational convenience, we define accumulators Sideq , X t ?q(t)f id... case we do not split that leaf. Note that (9) depends only on C, C1 and C2 and not on the other clusters, so the order in which we choose to split leaves makes no difference. We can compute the accumulators for an arbitrary cluster just by summing...

  4. Non-thermal phenomena in galaxies clusters

    E-Print Network [OSTI]

    Gianfranco Brunetti

    2004-04-26T23:59:59.000Z

    The discovery of diffuse synchrotron radio emission and, more recently, of the hard X-ray (HXR) tails have triggered a growing interest about non-thermal phenomena in galaxy clusters. After a brief review of the most important evidences for non-thermal emission, I will focus on the origin of the emitting particles and of the hadronic component. In particular I will describe the particle-injection and -acceleration mechanisms at work in the intra-cluster medium (ICM) and, at the same time, discuss the possibility to test current modellings of these phenomena with future radio, HXR, and gamma rays observatories.

  5. Feature Level Clustering of Large Biometric Database

    E-Print Network [OSTI]

    Mehrotra, Hunny; Radhika, V Bhawani; Majhi, Banshidhar; Gupta, Phalguni

    2010-01-01T23:59:59.000Z

    This paper proposes an efficient technique for partitioning large biometric database during identification. In this technique feature vector which comprises of global and local descriptors extracted from offline signature are used by fuzzy clustering technique to partition the database. As biometric features posses no natural order of sorting, thus it is difficult to index them alphabetically or numerically. Hence, some supervised criteria is required to partition the search space. At the time of identification the fuzziness criterion is introduced to find the nearest clusters for declaring the identity of query sample. The system is tested using bin-miss rate and performs better in comparison to traditional k-means approach.

  6. Mass Distributions of Clusters Using Gravitational Magnification

    E-Print Network [OSTI]

    Tom Broadhurst

    1995-05-03T23:59:59.000Z

    Lensing in the context of rich clusters is normally quantified from small image distortions, yielding a relative mass distribution in the limit of weak lensing. Here we show the magnification effect of lensing can also be mapped over a cluster, resulting in absolute mass determinations for the weak limit. Furthermore, given both magnification and distortion measurements, the mass distribution may be constrained in the strong regime. Methods for obtaining the magnification using spectroscopic and/or photometric information are discussed, for object detection within a fixed isophote or to a given flux limit. A map of the magnification around A1689 is constructed from the observed depletion of background red galaxy counts.

  7. Dynamical clustering of counterions on flexible polyelectrolytes

    E-Print Network [OSTI]

    Tak Shing Lo; Boris Khusid; Joel Koplik

    2007-07-31T23:59:59.000Z

    Molecular dynamics simulations are used to study the local dynamics of counterion-charged polymer association at charge densities above and below the counterion condensation threshold. Surprisingly, the counterions form weakly-interacting clusters which exhibit short range orientational order, and which decay slowly due to migration of ions across the diffuse double layer. The cluster dynamics are insensitive to an applied electric field, and qualitatively agree with the available experimental data. The results are consistent with predictions of the classical theory only over much longer time scales.

  8. Course Clusters | Photosynthetic Antenna Research Center

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisitingContract Management Fermi Site OfficeCourse Clusters Course Clusters Courses

  9. LAMPF II workshop, Los Alamos National Laboratory, Los Alamos, New Mexico, February 1-4, 1982

    SciTech Connect (OSTI)

    Thiessen, H.A. (comp.)

    1982-01-01T23:59:59.000Z

    This report contains the proceedings of the first LAMPF II Workshop held at Los Alamos February 1 to 4, 1982. Included are the talks that were available in written form. The conclusion of the participants was that there are many exciting areas of physics that will be addressed by such a machine.

  10. Los marginados como personajes: Teatro chileno de la década de los sesenta

    E-Print Network [OSTI]

    Villegas, Juan

    1986-04-01T23:59:59.000Z

    fuerza electoral en estos momentos y, en consecuencia inocuos políticamente, y los sectores de derecha en el poder a través de Jorge Alessandri, Presidente en el período 1958-1964. Si consideramos la ideología del grupo productor, el autor y el grupo...

  11. De los hacendados a los forestales: Manejo del espacio, dominacidn y explotacidn del bosque

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    papel de la tierra en el desarrollo del `capitalismo, los cuales se enfocaban sobre el mecanismo de la rural. Otros me- dios, a veces más sutiles, son a largo plazo más efecti- vos; por ejemplo, el despojo desarrollo", de comercialización y abastecimiento, etcétera. (Véase T. Lin& 1985). * Este texto fue elaborado

  12. Metal Enrichment of the Intra-Cluster Medium: Ram-Pressure Stripping of Cluster Galaxies

    E-Print Network [OSTI]

    W. Domainko; W. Kapferer; S. Schindler; E. van Kampen; S. Kimeswenger; M. Mair; M. Ruffert

    2004-05-28T23:59:59.000Z

    We present numerical simulations of the dynamical and chemical evolution of galaxy clusters. X-ray spectra show that the intra-cluster medium contains a significant amount of metals. As heavy elements are produced in the stars of galaxies material from the galaxies must have been expelled to enrich the ambient medium. We have performed hydrodynamic simulations investigating various processes. In this presentation we show the feedback from gas which is stripped from galaxies by ram-pressure stripping. The efficiency, resulting spatial distribution of the metals and the time dependency of this enrichment process on galaxy cluster scale is shown.

  13. Spatial clustering of pixels of a multispectral image

    DOE Patents [OSTI]

    Conger, James Lynn

    2014-08-19T23:59:59.000Z

    A method and system for clustering the pixels of a multispectral image is provided. A clustering system computes a maximum spectral similarity score for each pixel that indicates the similarity between that pixel and the most similar neighboring. To determine the maximum similarity score for a pixel, the clustering system generates a similarity score between that pixel and each of its neighboring pixels and then selects the similarity score that represents the highest similarity as the maximum similarity score. The clustering system may apply a filtering criterion based on the maximum similarity score so that pixels with similarity scores below a minimum threshold are not clustered. The clustering system changes the current pixel values of the pixels in a cluster based on an averaging of the original pixel values of the pixels in the cluster.

  14. ICA-Based Clustering of Genes from Microarray Expression Data

    E-Print Network [OSTI]

    Batzoglou, Serafim

    for microarray analysis, compared to the most widely used methods namely PCA and k-means clustering. We also of independent biological processes. Comparison of clustering performance among various ICA algorithms including

  15. Combining relations and text in scientific network clustering

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    attributes, like hierarchical clustering or k-means [13], [14], [15]. More precisely, unsupervised learning of several data types rises the problem of the meaning of the clustering. Indeed, the different comparison

  16. A Study of Hierarchical Correlation Clustering for Scientific Volume Data

    E-Print Network [OSTI]

    Wang, Chaoli

    hierarchical clustering methods based on qual- ity threshold, k-means, and random walks, to investigate. The evaluation includes side-by-side qualitative comparison of clustering results and quantitative comparison

  17. High density cluster jet target for storage ring experiments

    E-Print Network [OSTI]

    Alexander Täschner; Esperanza Köhler; Hans-Werner Ortjohann; Alfons Khoukaz

    2011-11-02T23:59:59.000Z

    The design and performance of a newly developed cluster jet target installation for hadron physics experiments are presented which, for the first time, is able to generate a hydrogen cluster jet beam with a target thickness of above $10^{15}\\,\\mathrm{atoms/cm}^2$ at a distance of two metres behind the cluster jet nozzle. The properties of the cluster beam and of individual clusters themselves are studied at this installation. Special emphasis is placed on measurements of the target beam density as a function of the relevant parameters as well as on the cluster beam profiles. By means of a time-of-flight setup, measurements of the velocity of single clusters and velocity distributions were possible. The complete installation, which meets the requirements of future internal fixed target experiments at storage rings, and the results of the systematic studies on hydrogen cluster jets are presented and discussed.

  18. Weak lensing flexion as a probe of galaxy cluster substructure

    E-Print Network [OSTI]

    Cain, Benjamin Martin

    2011-01-01T23:59:59.000Z

    Measuring galaxy cluster total masses and the amount of dark matter substructure within galaxy cluster haloes is a fundamental probe of the ACDM model of structure formation, as well as the interactions between baryonic ...

  19. Beltrami Equation and Cluster Lensing: Characteristic Equations and Applications

    E-Print Network [OSTI]

    Schramm; T

    1995-07-24T23:59:59.000Z

    Arclets in clusters of galaxies can be used to determine the lens mapping and not only to constrain the mass density of the cluster. Multiply imaged arclets are therefore easily identified without further modelling.

  20. THE ERA OF STAR FORMATION IN GALAXY CLUSTERS

    E-Print Network [OSTI]

    Brodwin, M.

    We analyze the star formation properties of 16 infrared-selected, spectroscopically confirmed galaxy clusters at 1 < z < 1.5 from the Spitzer/IRAC Shallow Cluster Survey (ISCS). We present new spectroscopic confirmation ...

  1. A COMPARISON OF ARTIFICIAL NEURAL NETWORKS AND CLUSTER ANALYSIS FOR TYPING BIOMETRICS

    E-Print Network [OSTI]

    A COMPARISON OF ARTIFICIAL NEURAL NETWORKS AND CLUSTER ANALYSIS FOR TYPING BIOMETRICS biometrics, artificial neural networks, cluster analysis, Multi Layer Perceptrons, K- means clustering are clustering techniques and Artificial Neural Networks , in conjunction with data processing to improve

  2. Adaptive dimension reduction for clustering high dimensional data

    E-Print Network [OSTI]

    Ding, Chris; He, Xiaofeng; Zha, Hongyuan; Simon, Horst

    2002-01-01T23:59:59.000Z

    theorem. The com- plete ADR-Kmeans algorithm is identical to1: Clustering results of ADM-Kmeans algorithm. Discussions

  3. Studies of nearby poor clusters - A3574 and S753

    SciTech Connect (OSTI)

    Willmer, C.N.A.; Focardi, P.; Chan, R.; Pellegrini, P.S.; Da Costa, N.L. (Observatorio Nacional do Brasil, Rio de Janeiro (Brazil))

    1991-01-01T23:59:59.000Z

    Photometric and spectroscopic data are presented for two clusters, A3574 and S753, belonging to the Centaurus concentration of galaxies. The masses of the clusters are estimated at 1.5 x 10 to the 14th solar masses; no evidence of substructure has been detected in either cluster. The solution of a two-body linear orbit suggests that the clusters do not form a bound system, although the result is marginal. 60 refs.

  4. Information about Practicums at Los Alamos

    SciTech Connect (OSTI)

    Bradley, Paul A. [Los Alamos National Laboratory

    2012-07-24T23:59:59.000Z

    The Los Alamos Neutron Science Center is the premier facility for neutron science experiments ranging from cross section measurements, neutron scattering experiments, proton radiography, cold neutrons, actinide neutronic properties, and many other exciting topics. The National High Magnetic Field Laboratory is home to several powerful magnets, including the one that created the first non-destructive 100 Tesla field in March 2012. They probe the electronic structure of superconductors, magnetic properties of materials (including magneto-quantum effects). Research is also conducted in correlated materials, thermoacoustics, and magnetic properties of actinides. The Trident Laser has a unique niche with very high power, short pulse experiments, with a peak power of 10{sup 20} W in short pulse mode. Discoveries range from production of monoenergetic MeV ion beam, nonlinear kinetic plasma waves, the transition between kinetic and fluid nonlinear behavior and other laser-plasma interaction processes.

  5. Environmental surveillance at Los Alamos during 1979

    SciTech Connect (OSTI)

    Not Available

    1980-04-01T23:59:59.000Z

    This report documents the environmental surveillance program conducted by the Los Alamos Scientific Laboratory (LASL) in 1979. Routine monitoring for radiation and radioactive or chemical substances was conducted on the Laboratory site and in the surrounding region to determine compliance with appropriate standards and permit early identification of possible undesirable trends. Results and interpretation of the data for 1979 on penetrating radiation, chemical and radiochemical quality of ambient air, surface and ground water, municipal water supply, soils and sediments, food, and airborne and liquid effluents are included. Comparisons with appropriate standards and regulations or with background levels from natural or other non-LASL sources provide a basis for concluding that environmental effects attributable to LASL operations are minor and cannot be considered likely to result in any hazard to the population of the area. Results of several special studies provide documentation of some unique environmental conditions in the LASL environs.

  6. Environmental surveillance at Los Alamos during 1992

    SciTech Connect (OSTI)

    Kohen, K.; Stoker, A.; Stone, G. [and others

    1994-07-01T23:59:59.000Z

    This report describes the environmental surveillance program at Los Alamos National Laboratory during 1992. The Laboratory routinely monitors for radiation and for radioactive and nonradioactive materials at (or on) Laboratory sites as well as in the surrounding region. LANL uses the monitoring results to determine compliance with appropriate standards and to identify potentially undesirable trends. Data were collected in 1992 to assess external penetrating radiation; quantities of airborne emissions and liquid effluents; concentrations of chemicals and radionuclides in ambient air, surface waters and groundwaters, municipal water supply, soils and sediments, and foodstuffs; and environmental compliance. Using comparisons with standards, regulations, and background levels, this report concludes that environmental effects from Laboratory operations are small and do not pose a demonstrable threat to the public, laboratory employees, or the environment.

  7. Environmental surveillance at Los Alamos during 1995

    SciTech Connect (OSTI)

    NONE

    1996-10-01T23:59:59.000Z

    This report describes the environmental surveillance program at Los Alamos National Laboratory (LANL or the Laboratory) during 1995. The Laboratory routinely monitors for radiation and for radioactive and nonradioactive materials at (or on) Laboratory sites as well as in the surrounding region. LANL uses the monitoring result to determine compliance with appropriate standards and to identify potentially undesirable trends. Data were collected in 1995 to assess external penetrating radiation; quantities of airborne emissions and liquid effluents; concentrations of chemicals and radionuclides in ambient air, surface waters and groundwaters, municipal water supply, soils and sediments, and foodstuffs; and environmental compliance. Using comparisons with standards, regulations, and background levels, this report concludes that environmental effects from Laboratory operations are small and do not pose a demonstrable threat to the public, Laboratory employees, or the environment.

  8. Environmental surveillance at Los Alamos during 1987

    SciTech Connect (OSTI)

    Not Available

    1988-05-01T23:59:59.000Z

    This report describes the environmental surveillance program conducted by Los Alamos National Laboratory during 1987. Routine monitoring for radiation and radioactive or chemical materials is conducted on the Laboratory site as well as in the surrounding region. Monitoring results are used to determine compliance with appropriate standards and to permit early identification of potentially undesirable trends. Results and interpretation of data for 1987 cover: external penetrating radiation; quantities of airborne emissions and liquid effluents; concentrations of chemicals and radionuclides in ambient air, surface and ground waters, municipal water supply, soils and sediments, and foodstuffs; and environmental compliance. Comparisons with appropriate standards, regulations, and background levels provide the basis for concluding that environmental effects from Laboratory operations are insignificant and do not pose a threat to the public, Laboratory employees, or the environment. 113 refs., 33 figs., 120 tabs.

  9. Los Alamos test-room results

    SciTech Connect (OSTI)

    McFarland, R.D.; Balcomb, J.D.

    1982-01-01T23:59:59.000Z

    Fourteen Los Alamos test rooms have been operated for several years; this paper covers operation during the winters of 1980-81 and 1981-82. Extensive data have been taken and computer analyzed to determine performance parameters such as efficiency, solar savings fraction, and comfort index. The rooms are directly comparable because each has the same net coefficient and solar collection area and thus the same load collector ratio. Configurations include direct gain, unvented Trombe walls, water walls, phase change walls, and two sunspace geometries. Strategies for reducing heat loss include selective surfaces, two brands of superglazing windows, a heat pipe system, and convection-suppression baffles. Significant differences in both backup heat and comfort are observed among the various rooms. The results are useful, not only for direct room-to-room comparisons, but also to provide data for validation of computer simulation programs.

  10. Environmental surveillance at Los Alamos during 2008

    SciTech Connect (OSTI)

    none,

    2009-09-30T23:59:59.000Z

    Environmental Surveillance at Los Alamos reports are prepared annually by the Los Alamos National Laboratory (the Laboratory) Environmental Programs Directorate, as required by US Department of Energy Order 450.1, General Environmental Protection Program, and US Department of Energy Order 231.1A, Environment, Safety, and Health Reporting. These annual reports summarize environmental data that are used to determine compliance with applicable federal, state, and local environmental laws and regulations, executive orders, and departmental policies. Additional data, beyond the minimum required, are also gathered and reported as part of the Laboratory’s efforts to ensure public safety and to monitor environmental quality at and near the Laboratory. Chapter 1 provides an overview of the Laboratory’s major environmental programs and explains the risks and the actions taken to reduce risks at the Laboratory from environmental legacies and waste management operations. Chapter 2 reports the Laboratory’s compliance status for 2007. Chapter 3 provides a summary of the maximum radiological dose the public and biota populations could have potentially received from Laboratory operations and discusses chemical exposures. The environmental surveillance and monitoring data are organized by environmental media (Chapter 4, air; Chapters 5 and 6, water and sediments; Chapter 7, soils; and Chapter 8, foodstuffs and biota) in a format to meet the needs of a general and scientific audience. Chapter 9 provides a summary of the status of environmental restoration work around LANL. A glossary and a list of acronyms and abbreviations are in the back of the report. Appendix A explains the standards for environmental contaminants, Appendix B explains the units of measurements used in this report, Appendix C describes the Laboratory’s technical areas and their associated programs, and Appendix D provides web links to more information.

  11. Environmental surveillance at Los Alamos during 2009

    SciTech Connect (OSTI)

    none,

    2010-09-30T23:59:59.000Z

    Environmental Surveillance at Los Alamos reports are prepared annually by the Los Alamos National Laboratory (the Laboratory) environmental organization, as required by US Department of Energy Order 5400.1, General Environmental Protection Program, and US Department of Energy Order 231.1A, Environment, Safety, and Health Reporting. These annual reports summarize environmental data that are used to determine compliance with applicable federal, state, and local environmental laws and regulations, executive orders, and departmental policies. Additional data, beyond the minimum required, are also gathered and reported as part of the Laboratory’s efforts to ensure public safety and to monitor environmental quality at and near the Laboratory. Chapter 1 provides an overview of the Laboratory’s major environmental programs and explains the risks and the actions taken to reduce risks at the Laboratory from environmental legacies and waste management operations. Chapter 2 reports the Laboratory’s compliance status for 2009. Chapter 3 provides a summary of the maximum radiological dose the public and biota populations could have potentially received from Laboratory operations and discusses chemical exposures. The environmental surveillance and monitoring data are organized by environmental media (air in Chapter 4; water and sediments in Chapters 5 and 6; soils in Chapter 7; and foodstuffs and biota in Chapter 8) in a format to meet the needs of a general and scientific audience. Chapter 9 provides a summary of the status of environmental restoration work around LANL. The new Chapter 10 describes the Laboratory’s environmental stewardship efforts and provides an overview of the health of the Rio Grande. A glossary and a list of acronyms and abbreviations are in the back of the report. Appendix A explains the standards for environmental contaminants, Appendix B explains the units of measurements used in this report, Appendix C describes the Laboratory’s technical areas and their associated programs, and Appendix D provides web links to more information.

  12. Environmental surveillance at Los Alamos during 2005

    SciTech Connect (OSTI)

    none,

    2006-09-30T23:59:59.000Z

    Environmental Surveillance at Los Alamos reports are prepared annually by the Los Alamos National Laboratory (LANL or the Laboratory) environmental organization, as required by US Department of Energy Order 5400.1, General Environmental Protection Program, and US Department of Energy Order 231.IA, Environment, Safety, and Health Reporting. These annual reports summarize environmental data that are used to determine compliance with applicable federal, state, and local environmental laws and regulations, executive orders, and departmental policies. Additional data, beyond the minimum required, are also gathered and reported as part of the Laboratory's efforts to ensure public safety and to monitor environmental quality at and near the Laboratory. Chapter 1 provides an overview of the Laboratory's major environmental programs. Chapter 2 reports the Laboratory's compliance status for 2005. Chapter 3 provides a summary of the maximum radiological dose the public and biota populations could have potentially received from Laboratory operations. The environmental surveillance and monitoring data are organized by environmental media (Chapter 4, Air; Chapters 5 and 6, Water and Sediments; Chapter 7, Soils; and Chapter 8, Foodstuffs and Biota) in a format to meet the needs of a general and scientific audience. Chapter 9, new for this year, provides a summary of the status of environmental restoration work around LANL. A glossary and a list ofacronyms and abbreviations are in the back of the report. Appendix A explains the standards for environmental contaminants, Appendix B explains the units of measurements used in this report, Appendix C describes the Laboratory's technical areas and their associated programs, and Appendix D provides web links to more information.

  13. The Infrared Luminosity of Galaxy Clusters

    E-Print Network [OSTI]

    Martin Giard; Ludovic Montier; Etienne Pointecouteau; Ellen Simmat

    2008-08-28T23:59:59.000Z

    The aim of this study is to quantify the infrared luminosity of clusters as a function of redshift and compare this with the X-ray luminosity. This can potentially constrain the origin of the infrared emission to be intracluster dust and/or dust heated by star formation in the cluster galaxies. We perform a statistical analysis of a large sample of galaxy clusters selected from existing databases and catalogues.We coadd the infrared IRAS and X-ray RASS images in the direction of the selected clusters within successive redshift intervals up to z = 1. We find that the total infrared luminosity is very high and on average 20 times higher than the X-ray luminosity. If all the infrared luminosity is to be attributed to emission from diffuse intracluster dust, then the IR to X-ray ratio implies a dust-to-gas mass abundance of 5e-4. However, the infrared luminosity shows a strong enhancement for 0.1 infrared luminosity that we measure is generated by the ongoing star formation in the member galaxies. From theoretical predictions calibrated on extinction measurements (dust mass abundance equal to 1e-5), we expect only a minor contribution, of a few percent, from intracluster dust.

  14. Knowledge Engineering Technique for Cluster Development

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Knowledge Engineering Technique for Cluster Development Pradorn Sureephong1 , Nopasit Chakpitak1 management by using knowledge engineering which is one of the most important method for managing knowledge. This work analyzed three well known knowledge engineering methods, i.e. MOKA, SPEDE and Common

  15. Statistical Learning Theory Nearest Neighbor Clustering

    E-Print Network [OSTI]

    functions such as the k-means objective function, graph cut objective functions, and many others. This consistency result is stronger than most of the existing consistency results in the literature such as for k-means Learning Research, (accepted) (2009). 2. Pollard, D.: Strong Consistency of k-means Clustering. Annals

  16. Clustering with Bregman Divergences Arindam Banerjee

    E-Print Network [OSTI]

    Ghosh, Joydeep

    . The proposed algorithms unify centroid-based parametric clustering approaches, such as classical kmeans main- tain the simplicity and scalability of the classical kmeans algorithm, while generalizing relocation scheme of Euclidean kmeans [14]. The popularity of this algorithm stems from its simplicity

  17. Mixture Models for Clustering and Dimension Reduction

    E-Print Network [OSTI]

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 3.3 A greedy approach to k-means clustering . . . . . . . . . . . . . . . . . . . 66 3.3.1 The global k-means algorithm . . . . . . . . . . . . . . . . . . . . . 67 3.3.2 Speeding up execution of global k-means . . . . . . . . . . . . . . . 68 3.3.3 Experimental results

  18. TOLERANCE ZONES THROUGH ROBUST CLUSTERING TECHNIQUES

    E-Print Network [OSTI]

    Cuesta, Juan Antonio

    -trimmed observations after a trimmed k-means procedure. Trimmed k-means were introduced in Cuesta-Albertos, Gordaliza and Matr´an (1997) with the aim of robustifying the classical k-means clustering procedure. In this work. References [1] Cuesta-Albertos, J.A., Gordaliza, A. and Matr´an, C. (1997), "Trimmed k-means: An attempt

  19. Molecular Cluster Perturbation Theory. I. Formalism

    E-Print Network [OSTI]

    Jason N. Byrd; Nakul Jindal; Robert W. Molt, Jr.; Rodney J. Bartlett; Beverly A. Sanders; Victor F. Lotrich

    2015-03-23T23:59:59.000Z

    We present second-order molecular cluster perturbation theory (MCPT(2)), a linear scaling methodology to calculate arbitrarily large systems with explicit calculation of individual wavefunctions in a coupled-cluster framework. This new MCPT(2) framework uses coupled-cluster perturbation theory and an expansion in terms of molecular dimer interactions to obtain molecular wavefunctions that are infinite-order in both the electronic fluctuation operator and all possible dimer (and products of dimers) interactions. The MCPT(2) framework has been implemented in the new SIA/Aces4 parallel architecture, making use of the advanced dynamic memory control and fine grained parallelism to perform very large explicit molecular cluster calculations. To illustrate the power of this method, we have computed energy shifts, lattice site dipole moments, and harmonic vibrational frequencies via explicit calculation of the bulk system for the polar and non-polar polymorphs of solid hydrogen fluoride. The explicit lattice size (without using any periodic boundary conditions) was expanded up to 1,000 HF molecules, with 32,000 basis functions and 10,000 electrons. Our obtained HF lattice site dipole moments and harmonic vibrational frequencies agree well with the existing literature.

  20. New nuclear three-body clusters ?{NN}

    E-Print Network [OSTI]

    Vladimir B. Belyaev; Werner Sandhas; Ivan I. Shlyk

    2007-07-31T23:59:59.000Z

    Binding energies of three-body systems of the type \\phi+2N are estimated. Due to the strong attraction between \\phi-meson and nucleon, suggested in different approaches, bound states can appear in systems like \\phi+np (singlet and triplet) and \\phi+pp. This indicates the principal possibility of the formation of new nuclear clusters.

  1. Detecting the Gravitational Redshift of Cluster Gas

    E-Print Network [OSTI]

    Tom Broadhurst; Evan Scannapieco

    2000-03-08T23:59:59.000Z

    We examine the gravitational redshift of radiation emitted from within the potential of a cluster. Spectral lines from the intracluster medium (ICM) are redshifted in proportion to the emission-weighted mean potential along the line of sight, amounting to approximately 50 km/s at a radius of 100 kpc/h, for a cluster dispersion of 1200 km/s. We show that the relative redshifts of different ionization states of metals in the ICM provide a unique probe of the three-dimensional matter distribution. An examination of the reported peculiar velocities of cD galaxies in well studied Abell clusters reveals they are typically redshifted by an average of $\\sim +200$ km/s. This can be achieved by gravity with the addition of a steep central potential associated with the cD galaxy. Note that in general gravitational redshifts cause a small overestimate of the recessional velocities of clusters by an average of $\\sim$ 20 km/s.

  2. College of Engineering High Performance Computing Cluster

    E-Print Network [OSTI]

    Demirel, Melik C.

    College of Engineering High Performance Computing Cluster Policy and Procedures COE-HPC-01 and registered as requiring high performance computing; the course identification/registrations process the College High Performance Computing system will need register for system access by visiting http

  3. Molecular Cluster Perturbation Theory. I. Formalism

    E-Print Network [OSTI]

    Jason N. Byrd; Nakul Jindal; Robert W. Molt, Jr.; Rodney J. Bartlett; Beverly A. Sanders; Victor F. Lotrich

    2015-01-14T23:59:59.000Z

    We present second-order molecular cluster perturbation theory (MCPT(2)), a linear scaling methodology to calculate arbitrarily large systems with explicit calculation of individual wavefunctions in a coupled-cluster framework. This new MCPT(2) framework uses coupled-cluster perturbation theory and an expansion in terms of molecular dimer interactions to obtain molecular wavefunctions that are infinite-order in both the electronic fluctuation operator and all possible dimer (and products of dimers) interactions. The MCPT(2) framework has been implemented in the new SIA/ACES parallel architecture, making use of the advanced dynamic memory control and fine grained parallelism to perform very large explicit molecular cluster calculations. To illustrate the power of this method, we have computed energy shifts and lattice site dipole moments via explicit calculation of the bulk system for the polar and non-polar polymorphs of solid hydrogen fluoride. The explicit lattice size without periodic boundary conditions was expanded up to 1,000 HF molecules, with 32,000 basis functions and 10,000 electrons. Our obtained HF lattice site dipole moments and harmonic vibrational frequencies agree well with the existing literature.

  4. A Binary Method for Fast Computation of Inter and Intra Cluster Similarities for Combining Multiple Clusterings

    E-Print Network [OSTI]

    Mimaroglu, Selim

    . k-means [5] is the best known partitional cluster- ing algorithm. k-means divides a set of objects provides comparison of our new method with the conventional technique for varying size data sets

  5. The Fate of Dwarf Galaxies in Clusters and the Origin of Intracluster Stars. I. Isolated Clusters

    E-Print Network [OSTI]

    Paramita Barai; William Brito; Hugo Martel

    2008-07-02T23:59:59.000Z

    The main goal of this paper is to compare the relative importance of destruction by tides, vs. destruction by mergers, in order to assess if tidal destruction of dwarf galaxies in clusters is a viable scenario for explaining the origin of intracluster stars. We have designed a simple algorithm for simulating the evolution of isolated clusters. The distribution of galaxies in the cluster is evolved using a direct gravitational N-body algorithm combined with a subgrid treatment of physical processes such as mergers, tidal disruption, and galaxy harassment. Using this algorithm, we have performed a total of 227 simulations. Our main results are (1) destruction of dwarf galaxies by mergers dominates over destruction by tides, and (2) the destruction of dwarf galaxies by tides is sufficient to explain the observed intracluster light in clusters.

  6. From nuclear clusters to halo globulars: Star clusters as basic galactic building blocks

    E-Print Network [OSTI]

    Richard de Grijs

    2006-09-05T23:59:59.000Z

    I assess the similarities and differences between the star-formation modes in quiescent spiral galaxies versus those in violent starburst regions, including galactic nuclei. As opposed to the quiescent star-formation mode, current empirical evidence on the star-formation processes in the extreme, high-pressure environments induced by galaxy encounters strongly suggests that star cluster formation is an important and perhaps even the dominant mode of star formation in such starburst events. This implies that by using star clusters as unique diagnostic probes, we can trace a galaxy's most violent star formation history very well, at least for the past few Gyr. The sizes, luminosities, and mass estimates of the young massive star clusters are entirely consistent with what is expected for young Milky Way-type globular clusters (GCs). Recent evidence lends support to the scenario that GCs, which were once thought to be the oldest building blocks of galaxies, are still forming today.

  7. clusterMaker: a multi-algorithm clustering plugin for Cytoscape

    E-Print Network [OSTI]

    2011-01-01T23:59:59.000Z

    than 40% of all known proteins lack any annota- tions withinprotein BH2212 from Bacillus halodurans (gi:15614775) lacksprotein interaction data sets have been clustered to identify stable complexes, but scientists lack

  8. Factor analysis of Galactic globular clusters on structural parameters

    E-Print Network [OSTI]

    O. Eigenson; O. Yatsyk

    2000-11-08T23:59:59.000Z

    Principal component method is used to study galactic globular clusters in 7- and 8-axis space of structural parameters. It is shown that the manifold properties of clusters with this set of parameters is determined mainly by two independent factors. This result may be useful for the theory of formation and evolution of clusters.

  9. Cluster Value Problems in Infinite-Dimensional Spaces

    E-Print Network [OSTI]

    Ortega Castillo, Sofia

    2014-08-05T23:59:59.000Z

    In this dissertation we study cluster value problems for Banach algebras H(B) of analytic functions on the open unit ball B of a Banach space X that contain X* and 1. Solving cluster value problems requires understanding the cluster set of a...

  10. Energy Conservation in Heterogeneous Server Clusters Taliver Heath

    E-Print Network [OSTI]

    Bianchini, Ricardo

    Energy Conservation in Heterogeneous Server Clusters #3; Taliver Heath Dept. of Computer Science, measurement Keywords Energy conservation, server clusters, heterogeneity #3; This research has been supported.g., [3, 4, 9, 21]) and dynamic cluster recon#12;guration for energy conservation without per- formance

  11. An Interactive, Example-Based, Visual Clustering System

    E-Print Network [OSTI]

    An Interactive, Example-Based, Visual Clustering System Pierrick Bruneau 1 and Benoit Otjacques 1 1) Abstract This work describes and evaluates a novel interactive visual clustering system. It combines a 2D projection with a clustering algorithm that operates on this pro- jected data. Users can interact directly

  12. HEAVY GOLD CLUSTER BEAMS production and identi cation

    E-Print Network [OSTI]

    Boyer, Edmond

    . This method is based on the acceleration of the clusters to high energy (MeV) and on the measurement, after to select heavy Aun cluster beams for applications at low energy (keV) in mass spectrometry. 1. Introduction, with a multianode detector 7], the number of constituents coming out of the foil. High energy clusters, accelerated

  13. TIGER:Thermal-Aware File Assignment in Storage Clusters

    E-Print Network [OSTI]

    Qin, Xiao

    energy efficiency of data centers housing storage clusters. Disks have non-negligible thermal impactTIGER:Thermal-Aware File Assignment in Storage Clusters Ajit Chavan, Xunfei Jiang, Mohemmad I/O performance. I. INTRODUCTION Thermal management for power-dense storage clusters can address cooling problems

  14. Robust Control-theoretic Thermal Balancing for Server Clusters

    E-Print Network [OSTI]

    Lu, Chenyang

    Robust Control-theoretic Thermal Balancing for Server Clusters Yong Fu, Chenyang Lu, Hongan Wang for clusters because of the increasing power consumption of modern processors, compact server architectures and growing server density in data centers. Thermal balancing mitigates hot spots in a cluster through dynamic

  15. Automatic Clustering of Grid Nodes Department of Electrical and

    E-Print Network [OSTI]

    Subhlok, Jaspal

    Automatic Clustering of Grid Nodes Qiang Xu Department of Electrical and Computer Engineering Science University of Houston Houston, Texas 77204 Email: jaspal@uh.edu Abstract-- In a grid to an efficient, scalable and portable method of clustering grid nodes and building a distance map among clusters

  16. Spectral Embedded Clustering Feiping Nie1,2

    E-Print Network [OSTI]

    Tsang Wai Hung "Ivor"

    , K-means and Discrimi- native K-means. The experiments on many real- world data sets show that SEC significantly out- performs the existing spectral clustering methods as well as K-means clustering related have been developed such as K-means clustering, mixture models [McLachlan and Peel, 2000], spectral

  17. Visualizing non-hierarchical and hierarchical cluster analyses with

    E-Print Network [OSTI]

    Schonlau, Matt

    are impractical when the data set is large. For non-hierarchical cluster algorithms (e.g. Kmeans) a graph like implementations of the Kmeans algorithm. A data set related to asbestos claims and the Thailand Landmine Data-hierarchical, large data, Kmeans algorithm #12;2 1 Introduction The purpose of cluster analysis is to cluster

  18. Normalized k-means clustering of hyper-rectangles

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Normalized k-means clustering of hyper-rectangles Marie Chavent Math´ematiques Appliqu´ees de-rectangles and their use in two normalized k-means clustering algorithms. Keywords: Interval data, Standardization [Diday, 1988], [Bock and Diday, 2000]. Several works on k-means clustering of interval data sets have

  19. Stability of K-Means Clustering Alexander Rakhlin

    E-Print Network [OSTI]

    Rakhlin, Alexander "Sasha"

    Stability of K-Means Clustering Alexander Rakhlin Department of Computer Science UC Berkeley phrase K-means clustering as an empirical risk minimization procedure over a class HK and explicitly calculate the covering number for this class. Next, we show that stability of K-means clustering

  20. Experimental Comparison of Cluster Ensemble L.I. Kuncheva

    E-Print Network [OSTI]

    Kuncheva, Ludmila I.

    ). The best ensembles were based on k-means individual clusterers. Consensus functions interpreting clusterers were created using the same clustering method, in one of the following ways: (a) k-means with random initialisations (b) k-means with random initialisations and using random sub-samples of the da

  1. Understanding Complex Network Attack Graphs through Clustered Adjacency Matrices

    E-Print Network [OSTI]

    Noel, Steven

    Understanding Complex Network Attack Graphs through Clustered Adjacency Matrices Steven Noel}@gmu.edu Abstract We apply adjacency matrix clustering to network attack graphs for attack correlation, prediction, and hypothesizing. We self-multiply the clustered adjacency matrices to show attacker reachability across

  2. Aalborg Universitet Hierarchical Control for Multiple DC Microgrids Clusters

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Aalborg Universitet Hierarchical Control for Multiple DC Microgrids Clusters Shafiee, Qobad Control for Multiple DC Microgrids Clusters. I E E E Transactions on Energy Conversion. General rights, J. C. Vasquez, and J. M. Guerrero, "Hierarchical Control for Multiple DC-Microgrids Clusters," IEEE

  3. VISCOSITY OF CONCENTRATED SUSPENSIONS: INFLUENCE OF CLUSTER FORMATION

    E-Print Network [OSTI]

    Boyer, Edmond

    1 VISCOSITY OF CONCENTRATED SUSPENSIONS: INFLUENCE OF CLUSTER FORMATION V.Starov1 , V.Zhdanov1 , M and these forces determine both structure and size of clusters. We assume that viscosity of concentrated suspension of viscosity on a concentration of dispersed particles taking into account cluster formation, is deduced. Under

  4. Parametrization of light clusters within relativistic mean field models

    SciTech Connect (OSTI)

    Ferreira, Marcio; Providencia, Constanca [Centro de Fisica Computacional, Department of Physics, University of Coimbra, P-3004-516 Coimbra (Portugal)

    2013-06-10T23:59:59.000Z

    Light clusters are included in the equation of state of nuclearmatter within the relativistic mean field theory. The effect of the cluster-meson coupling constants on the dissolution density is discussed. Theoretical and experimental constraints are used to fix the cluster-meson couplings at T Almost-Equal-To 5 MeV.

  5. cars: A New Code Generation Framework for Clustered ILP Processors

    E-Print Network [OSTI]

    Kailas, Krishnan

    â??glu z Ashok Agrawala \\Lambda y Department of Electrical & Computer Engineering z T. J. Watson Research are characterized by a large number of non­centralized on­chip re­ sources grouped into clusters. Traditional code we present cars, a code generation framework for Clustered ILP processors, which combines the cluster

  6. THE BURST CLUSTER: DARK MATTER IN A CLUSTER MERGER ASSOCIATED WITH THE SHORT GAMMA-RAY BURST, GRB 050509B

    E-Print Network [OSTI]

    Dahle, H.

    We have identified a merging galaxy cluster with evidence of two distinct subclusters. The X-ray and optical data suggest that the subclusters are presently moving away from each other after closest approach. This cluster ...

  7. The Sustainability FYE Cluster The Sustainability FYE Cluster will make sustainable urban living a core experience for First

    E-Print Network [OSTI]

    The Sustainability FYE Cluster The Sustainability FYE Cluster will make sustainable urban living University. The Sustainability community infuses the learning-living community with practical and theoretical approaches to sustainable living, merging students' living community with unique academic and field

  8. On the formation of massive stellar clusters

    E-Print Network [OSTI]

    Guillermo Tenorio-Tagle; Jan Palous; Sergiy Silich; Gustavo A. Medina-Tanco; Casiana Munoz-Tunon

    2003-08-25T23:59:59.000Z

    Here we model a star forming factory in which the continuous creation of stars results in a highly concentrated, massive (globular cluster-like) stellar system. We show that under very general conditions a large-scale gravitational instability in the ISM, which triggers the collapse of a massive cloud, leads with the aid of a spontaneous first generation of massive stars, to a standing, small-radius, cold and dense shell. Eventually, as more of the collapsing matter is processed and incorporated, the shell becomes gravitationally unstable and begins to fragment, allowing the formation of new stars, while keeping its location. This is due to a detailed balance established between the ram pressure from the collapsing cloud which, together with the gravitational force exerted on the shell by the forming cluster, acts against the mechanical energy deposited by the collection of new stars. We analyze the mass spectrum of fragments that result from the continuous fragmentation of the standing shell and show that its shape is well approximated at the high mass end by a power law with slope -2.25, very close to the value that fits the universal IMF. The self-contamination resultant from the continuous generation of stars is shown to lead to a large metal spread in massive ($\\sim$ 10$^6$ M$_\\odot$) clusters, while clusters with a mass similar to 10$^5$ M$_\\odot$ or smaller, simply reflect the initial metalicity of the collapsing cloud. This is in good agreement with the data available for globular clusters in the Galaxy.

  9. Obscured clusters.I. GLIMPSE30 - Young Milky Way Star Cluster Hosting Wolf-Rayet Stars

    E-Print Network [OSTI]

    Kurtev, R; Georgiev, L; Ortolani, S; Ivanov, V D

    2007-01-01T23:59:59.000Z

    Young massive clusters are perfect astrophysical laboratories for study of massive stars. Clusters with Wolf-Rayet (WR) stars are of special importance, since this enables us to study a coeval WR population at a uniform metallicity and known age. GLIMPSE30 (G30) is one of them. The cluster is situated near the Galactic plane (l=298.756deg, b=-0.408deg) and we aimed to determine its physical parameters and to investigate its high-mass stellar content and especially WR stars. Our analysis is based on SOFI/NTT JsHKs imaging and low resolution (R~2000) spectroscopy of the brightest cluster members in the K atmospheric window. For the age determination we applied isochrone fits for MS and Pre-MS stars. We derived stellar parameters of the WR stars candidates using a full nonLTE modeling of the observed spectra. Using a variety of techniques we found that G30 is very young cluster, with age t~4Myr. The cluster is located in Carina spiral arm, it is deeply embedded in dust and suffers reddening of Av~10.5+-1.1mag. T...

  10. Deriving physical parameters of unresolved star clusters III. Application to M31 PHAT clusters

    E-Print Network [OSTI]

    de Meulenaer, Philippe; Mineikis, Tadas; Vansevi?ius, Vladas

    2015-01-01T23:59:59.000Z

    This study is the third of a series that investigates the degeneracy and stochasticity problems present in the determination of physical parameters such as age, mass, extinction, and metallicity of partially resolved or unresolved star cluster populations situated in external galaxies when using broad-band photometry. This work tests the derivation of parameters of artificial star clusters using models with fixed and free metallicity for the WFC3+ACS photometric system. Then the method is applied to derive parameters of a sample of 203 star clusters in the Andromeda galaxy observed with the HST. Following Papers I \\& II, the star cluster parameters are derived using a large grid of stochastic models that are compared to the observed cluster broad-band integrated WFC3+ACS magnitudes. We derive the age, mass, and extinction of the sample of M31 star clusters with one fixed metallicity in agreement with previous studies. Using artificial tests we demonstrate the ability of the WFC3+ACS photometric system to ...

  11. Tracking Cluster Debris (TraCD) I: dissolution of clusters and searching the Solar cradle

    E-Print Network [OSTI]

    Loyola, Guido R I Moyano; Hurley, Jarrod R; Gibson, Brad K

    2014-01-01T23:59:59.000Z

    Here we focus on the dynamical aspect and given that most of the stars in the Milky Way have been born in stellar associations or clusters that have lived a few Myr up to several Gyr, we focus on the evolution of star clusters. We have carried out our simulations in two steps: 1) we have created a Galactic disc dynamically as close to observations as possible and 2) we have evolved three sets of stellar clusters with masses of 400, 1000 and 15000 Msun to dissolution. The birth location of these sets was 4, 6, 8 and 10 kpc for the 400 and 1000 Msun clusters and 4, 6, 8, 10 and 12 kpc for the 15000 Msun. We have focussed our efforts on studying the state of these escapers after 4.5 Gyr of evolution in the Solar annulus, i.e. 7.5 < Rgc < 8.5 kpc. We have also analysed the possibility of a given star escaping from our clusters with a mass close to the mass of the Sun to end in the Solar orbit. We found by using dynamical arguments that for our 400 Msun clusters there is a 49 per cent higher chance of the Su...

  12. Subaru Weak Lensing Measurements of Four Strong Lensing Clusters: Are Lensing Clusters Over-Concentrated?

    SciTech Connect (OSTI)

    Oguri, Masamune; Hennawi, Joseph F.; Gladders, Michael D.; Dahle, Haakon; Natarajan, Priyamvada; Dalal, Neal; Koester, Benjamin P.; Sharon, Keren; Bayliss, Matthew

    2009-01-29T23:59:59.000Z

    We derive radial mass profiles of four strong lensing selected clusters which show prominent giant arcs (Abell 1703, SDSS J1446+3032, SDSS J1531+3414, and SDSS J2111-0115), by combining detailed strong lens modeling with weak lensing shear measured from deep Subaru Suprime-cam images. Weak lensing signals are detected at high significance for all four clusters, whose redshifts range from z = 0.28 to 0.64. We demonstrate that adding strong lensing information with known arc redshifts significantly improves constraints on the mass density profile, compared to those obtained from weak lensing alone. While the mass profiles are well fitted by the universal form predicted in N-body simulations of the {Lambda}-dominated cold dark matter model, all four clusters appear to be slightly more centrally concentrated (the concentration parameters c{sub vir} {approx} 8) than theoretical predictions, even after accounting for the bias toward higher concentrations inherent in lensing selected samples. Our results are consistent with previous studies which similarly detected a concentration excess, and increases the total number of clusters studied with the combined strong and weak lensing technique to ten. Combining our sample with previous work, we find that clusters with larger Einstein radii are more anomalously concentrated. We also present a detailed model of the lensing cluster Abell 1703 with constraints from multiple image families, and find the dark matter inner density profile to be cuspy with the slope consistent with -1, in agreement with expectations.

  13. Appendix A K-means and Fuzzy K-means Clustering 11.1 K-Means Clustering

    E-Print Network [OSTI]

    Bowden, Richard

    199 Appendix A ­ K-means and Fuzzy K-means Clustering 11 11.1 K-Means Clustering Clustering by a gradient descent based iterative algorithm that is known as k-means (or c-means) algorithm or the Generalised Lloyd algorithm {Karayiannis 95]. The k-means algorithm begins with a set of k initial exemplars

  14. Intense emission of cluster anions from gold targets under impact of keV/u gold clusters.

    E-Print Network [OSTI]

    Boyer, Edmond

    Intense emission of cluster anions from gold targets under impact of keV/u gold clusters. M the emission yield of anionic clusters increases much faster with n than expected from simple proportionality. Accordingly, the most intense emission is observed for Au7 - : under Au9 + impact the Au7 - yield per incident

  15. Fusion ProgramFusion Program Overview at Los Alamos

    E-Print Network [OSTI]

    by the Los Alamos National Security, LLC for the DOE/NNSA Slide 1 LA-UR 09-07809 #12;ABSTRACT OUTLINERIE U N C L A S S I F I E D Operated by the Los Alamos National Security, LLC for the DOE/NNSA Slide 2 by the Los Alamos National Security, LLC for the DOE/NNSA Slide 3 #12;FES 2009 LANL Highlights Research

  16. Los Alamos National Laboratory's Associate Directorate for Environment...

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

    The Pueblo Canyon wetland formed as a result of discharges from Los Alamos County's wastewater treatment facility and over time functions as a catchall stabilization system for...

  17. Los Angeles County's Green Idea House Achieves Efficient Goals...

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

    County's Green Idea House Achieves Efficient Goals Los Angeles County's Green Idea House Achieves Efficient Goals Photo of an energy-efficient home with modern architecture. The...

  18. Page Name: Subject/Program/Project, Acronym: Los Alamos National...

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

    security data analysis Laboratory-directed research and development in Physics Division Focus on Physics Trident Laser Facility The Trident Laser Facility at Los Alamos National...

  19. Los Alamos County Completes Abiquiu Hydropower Project, Bringing...

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

    County Completes Abiquiu Hydropower Project, Bringing New Clean Energy Resources to New Mexico Los Alamos County Completes Abiquiu Hydropower Project, Bringing New Clean Energy...

  20. Seventy-three New Mexico students receive Los Alamos Employees...

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

    Seventy-three students receive LAESF scholarships Seventy-three New Mexico students receive Los Alamos Employees' Scholarship Fund scholarships Raymond Fasano of Bernalillo High...