National Library of Energy BETA

Sample records for io ir iq

  1. IO6490

    Office of Legacy Management (LM)

    1 ' f. (5 4 . . i/ IO6490 ~-~~ -Landfill, ' cleanup plan' is. expected by August peruneat OfEnergy tiy they hope mlxa~~amfari~cclcanupplan for four radioactive oitcs m the puwn of Tonawanda by early e- naidE.%rk,DOEsitcman- ~a,saidalltkrexarchandtech- fucd data cdkted at ctkc four 6ilc5 ha3 been forwarded ti his suptx.iors In WashingronJC. ' when it still awaits We' re still wal r .f$, co* liar iEP-+-* 6adMr. Wehmdaiinourd0cum8nu in February .bur unfommuely them' s a group in Wnshington we.

  2. I/O Formats

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

    Formats I/O Formats Software I/O continues to be one of the main bottlenecks for scientific applications. Here are two software packages that many application developers use to manage input/output of heterogeneous types of binary application data used on many different platforms. HDF5 and NETCDF are both implemented on top of MPI-IO and have gained popularity as alternatives to basic POSIX API. HDF5 is a machine-independent and self-documenting file format. Each HDF5 file "looks" like

  3. IO SUBSYSTEM 1 BETA

    Energy Science and Technology Software Center (OSTI)

    2002-08-21

    "IO Subsystem Ver. 1.0 Beta" uses standard object-oriented principles to minimize dependencies between the underlying input or output database format and the client code (i.e., Sierra) using the io subsystem. The interface and priciples are simolar to the Facade pattern described in the "Design Patterns" book by Gamma, et.al. The software uses data authentication algorithms to ensure data input/output is consistent with model being defined. "IO Subsystem Ver. 1.0 Beta" is a database independent input/outputmore » library for finite element analysis, preprocessing, post processing, and translation programs.« less

  4. PDSF I/O Monitoring

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

    PDSF I/O Monitoring Last edited: 2016-04-29 11:34:41

  5. I/O Resources

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

    If your job uses global scratch (aka GSCRATCH or globalscratch2sd) you must use the global scratch IO resource: qsub -l gscratchio1 Global scratch is ...

  6. Quiz: Test Your Grid IQ | Department of Energy

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

    Test Your Grid IQ Quiz: Test Your Grid IQ Test your Power Grid IQ Do you know your synchrophasors from your microgrids? Test your knowledge of the electric grid with our grid IQ ...

  7. EdenIQ | Open Energy Information

    Open Energy Info (EERE)

    to: navigation, search Name: EdenIQ Place: Visalia, California Zip: 93291 Sector: Biofuels Product: EdenIQ is a spin-out of Altra Biofuels that is developing yield enhancement...

  8. Palmer-IO.ppt

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

    Paige Terlip Paige Terlip Paige Terlip - Former Communicator, National Renewable Energy Laboratory Paige Terlip Paige Terlip is a former communicator at DOE's National Renewable Energy Laboratory. Most Recent Spruce Up Your Home for Spring and Summer May 6 Which Water Heater Is Right for You? March 5 Love Your Home and It'll Love You Back February 11

    IO Requirements for a Global Cloud Resolving Model Bruce Palmer Annette Koontz Karen Schuchardt Geodesic Grid Geodesic grids can be decomposed

  9. EFG IO?-90)

    Office of Legacy Management (LM)

    .?GE = 1325 d +3-891 EFG IO?-90) ' United States Government *memorandum DATE: FEB 6 1991 . . I ;' 1 , q' *_* Departrnkt of Energy --. -* r- i .,. 1 .' ;I "--' I ,_ % I : [ -- ,: -.. ! j i 1: \ REPLY TO ATTN OF: EM-421 SUBJECT: Authority Determination-- Former Beryllium Production Facility in Luckey, ' Ohio TO: The File The attached review documents the basis for determining whether DOE has authority for taking remedial action at the former beryllium production facility in Luckey, Ohio,

  10. Cray IO COE

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

    IO COE Performance of MPIIO on DVS+GPFS Yushu Yao Collaboration with: Mike Aamodt, Katie Antypas, Tina Butler, Mark Cruciani, Jason Hick, David Knaak, Rei Lee, Rose Olson, Mike Welcome 1 Wednesday, July 25, 12 WHY 2 Wednesday, July 25, 12 Scratch 35GB/S LSI 7900 OSS OSS OSS OSS OSS OSS ... ... LSI 7900 LSI 7900 ... ... LSI 7900 LSI 7900 ... ... DDN DDN DDN DDN PROJECT DVS DDN DDN DDN DDN GSCRATCH Data Analysis Visualization ... ... PNSD PNSD PNSD CMP CMP CMP ... CMP CMP CMP ... ... ... ...

  11. Quiz: Test Your Wind Energy IQ | Department of Energy

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

    Wind Energy IQ Quiz: Test Your Wind Energy IQ August 10, 2015 - 1:05pm Addthis QUIZ: Test your Wind Energy IQ Think you know a lot about wind power? Here's your chance to test your ...

  12. QUIZ: Test your Wind Energy IQ | Department of Energy

    Energy Savers [EERE]

    Wind Energy IQ QUIZ: Test your Wind Energy IQ QUIZ: Test your Wind Energy IQ Think you know a lot about wind power? Here's your chance to test your knowledge 1. What causes wind? ...

  13. Quiz: Test Your Solar IQ | Department of Energy

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

    Solar IQ Quiz: Test Your Solar IQ June 18, 2015 - 11:49am Addthis QUIZ: Test your Solar IQ Think you know PV from CSP? Put your brainpower to the test with our solar energy quiz ...

  14. QUIZ: Test your Home Energy IQ | Department of Energy

    Office of Environmental Management (EM)

    QUIZ: Test your Home Energy IQ QUIZ: Test your Home Energy IQ Test your Home Energy IQ Find out if you are the brightest bulb when it comes to home energy use trivia 1. What ...

  15. Quiz: Test Your Home Energy IQ | Department of Energy

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

    Home Energy IQ Quiz: Test Your Home Energy IQ October 7, 2015 - 12:38pm Addthis Test your Home Energy IQ Find out if you are the brightest bulb when it comes to home energy use ...

  16. Quiz: Test Your Lighting IQ | Department of Energy

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

    Lighting IQ Quiz: Test Your Lighting IQ March 23, 2016 - 12:40pm Addthis Quiz: Test Your Lighting IQ How bright are you when it comes to lighting trivia? Test your knowledge with ...

  17. Quiz: Test Your Grid IQ | Department of Energy

    Office of Environmental Management (EM)

    Grid IQ Quiz: Test Your Grid IQ April 20, 2015 - 2:20pm Addthis Test your Power Grid IQ Do you know your synchrophasors from your microgrids? Test your knowledge of the electric ...

  18. Quiz: Test Your Lighting IQ | Department of Energy

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

    Quiz: Test Your Lighting IQ Quiz: Test Your Lighting IQ Quiz: Test Your Lighting IQ How bright are you when it comes to lighting trivia? Test your knowledge with this fun quiz 1. ...

  19. Geodesic IO Library

    Energy Science and Technology Software Center (OSTI)

    2011-03-15

    GIO is an application programmer interface (API) or library for high performance IO that is designed for climate models that operate on a geodesic grid. GIO uses a combination of configuration files and API calls to define the mapping of internal model data to output variables in standard climate data formats. The mapping from model data to model output includes method of data slicing, aggregation, and linearization using a morton ordering approach. The data ismore » then persisted through a standard interface that can be implemented using several different high level parallel libraries. Both Parallel NetCDF and NetCDF4 interfaces are provided. GIO is designed to run on supercomputing systems or multi-processor clusters with parallel file systems.« less

  20. Alternative Fuels Data Center: Test Your Alternative Fuel IQ

    Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

    Test Your Alternative Fuel IQ to someone by E-mail Share Alternative Fuels Data Center: Test Your Alternative Fuel IQ on Facebook Tweet about Alternative Fuels Data Center: Test Your Alternative Fuel IQ on Twitter Bookmark Alternative Fuels Data Center: Test Your Alternative Fuel IQ on Google Bookmark Alternative Fuels Data Center: Test Your Alternative Fuel IQ on Delicious Rank Alternative Fuels Data Center: Test Your Alternative Fuel IQ on Digg Find More places to share Alternative Fuels Data

  1. I/O Statistics Last 30 Days

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

    I/O Statistics Last 30 Days I/O Statistics Last 30 Days These plots show the daily statistics for the last 30 days for the storage systems at NERSC in terms of the amount of data transferred and the number of files transferred. Daily I/O Volume Daily I/O Count

  2. SC11-IO.pptx

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

    * You can use disk storage (large) as slow RAM memory (out-of-core algorithms) * Reading in large datasets for analysis or visualization Some reasons you might need IO...

  3. I/O Case Studies

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

    (>10%) dealing IO related to the tecplot files Frequent OpenSeekClose uses lots of meta time Meta time is 50X of the actual write time Suggestion KEEP the file open saves 90%...

  4. Optimizing I/O performance on the Lustre file system

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

    IO performance. File striping will primarily improve performance for codes doing serial IO from a single node or parallel IO from multiple nodes writing to a single shared...

  5. IQ Power AG formerly iQ Power Technology Inc | Open Energy Information

    Open Energy Info (EERE)

    is a developer and manufacturer of advanced, intelligent systems for optimising the performance of car batteries, independent of the specific battery technology. References: iQ...

  6. BuildingIQ Inc: Predictive Energy Optimization | Department of Energy

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

    BuildingIQ Inc: Predictive Energy Optimization BuildingIQ Inc: Predictive Energy Optimization BuildingIQ Inc: Predictive Energy Optimization Lead Performer: BuildingIQ Inc. - Foster City, California Partners: Department of General Services - Washington, DC DOE Funding: $1,767,138 Cost Share: $1,767,138 Project Term: October 2014 - September 2016 Funding Opportunity: Funding Opportunity Announcement Number DE-FOA-0001084 Project Objective BuildingIQ offers an innovative, scalable, and low-cost

  7. Introduction to Scientific I/O

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

    Scientific I/O Show All | 1 2 3 4 5 6 | Next » Introduction to Scientific I/O Table of Contents Introduction to Scientific I/O The Lustre File System The HDF5 Library Parallel HDF5 Scientific I/O in HDF5 Optimizations for HDF5 on Lustre Introduction to Scientific I/O I/O is commonly used by scientific applications to achieve goals like: storing numerical output from simulations for later analysis; implementing 'out-of-core' techniques for algorithms that process more data than can fit in system

  8. Parallel I/O in Practice

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

    art. This tutorial sheds light on the state-of-the-art in parallel IO and provides the knowledge necessary for attendees to best leverage IO resources available to them. We...

  9. Hopper File Storage and I/O

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

    File Storage and IO File Storage and IO Disk Quota Change Request Form Hopper File Systems Hopper has 5 user file systems which provide different degrees of storage, performance...

  10. diod - distributed I/O daemon

    Energy Science and Technology Software Center (OSTI)

    2010-01-29

    diod is an I/O forwarding daemon used to improve scalability of file systems on large Linux clusters.

  11. File Storage and I/O

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

    File Storage and I/O File Storage and I/O Disk Quota Change Request Form Cori File Systems The Cori system has 3 different user-accessible file systems; they provide different levels of disk storage and I/O performance. The table below describes these systems. File System Home Scratch Project Environment Variable $HOME $SCRATCH None. Must use /project/projectdirs/ Description Global home file system shared with other NERSC systems. All NERSC machines mount the same home directory. GPFS

  12. File storage and I/O

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

    File storage and I/O File storage and I/O Disk Quota Change Request Form Franklin File Systems The Franklin system has 4 different file systems mounted which provide different levels of disk storage, I/O performance and file permanence. The table below describes the various Franklin file systems File System Home Local Scratch Project Environment Variable Definition $HOME $SCRATCH $SCRATCH2 No environment variable /project/projectdirs/ Description Global homes file system shared with other NERSC

  13. Trilinos I/O Support (Trios)

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

    Oldfield, Ron A.; Sjaardema, Gregory D.; Lofstead II, Gerald F.; Kordenbrock, Todd

    2012-01-01

    Trilinos I/O Support (Trios) is a new capability area in Trilinos that serves two important roles: (1) it provides and supports I/O libraries used by in-production scientific codes; (2) it provides a research vehicle for the evaluation and distribution of new techniques to improve I/O on advanced platforms. This paper provides a brief overview of the production-grade I/O libraries in Trios as well as some of the ongoing research efforts that contribute to the experimental libraries in Trios.

  14. Mili I/O Library

    Energy Science and Technology Software Center (OSTI)

    1996-08-23

    Mili is a high-level mesh I/O library and database developed to support computational analysis and post-processing on unstructured finite element meshes. Mili provides is self-describing database with high-level, finite element analysis-cognizant semantics, and cross-platform data portability. Mili provides analysis codes with the capability to completely describe and label the state data, which will be output do disk. Mili has both C and FORTRAN interfaces and provides for database portability by supporting both big-and little-endian binarymore » formats.« less

  15. I/O Resources for Scientific Applications at NERSC

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

    IO Resources for Scientific Applications at NERSC IO Resources for Scientific Applications at NERSC Introduction NERSC provides a range of online resources to assist users...

  16. Increase Your H2IQ | Department of Energy

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

    Education » Increase Your H2IQ Increase Your H2IQ Increase your H2IQ Find easy-to-understand information about hydrogen (H2) and fuel cell technologies here! Increase your H2IQ by checking out our fact sheets and other introductory resources. Also visit our multimedia page to find infographics, videos, and animations about hydrogen and fuel cell technologies. Basic Fact Sheets These fact sheets provide a basic introduction to hydrogen and fuel cell technologies for non-technical audiences. Fuel

  17. File Storage and I/O

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

    File Storage and I/O File Storage and I/O Disk Quota Change Request Form Hopper File Systems Hopper has 5 user file systems which provide different degrees of storage, performance and permanence. The table below summarizes these file systems: File System Home Local Scratch Global Scratch Project Environment Variable Definition $HOME $SCRATCH $SCRATCH2 $GSCRATCH None. Must use /project/projectdirs/ Description Global home file system shared with other NERSC systems. All NERSC machines mount the

  18. QUIZ: Test Your Climate Change IQ | Department of Energy

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

    QUIZ: Test Your Climate Change IQ QUIZ: Test Your Climate Change IQ April 18, 2016 - 11:30am Addthis Quiz: Test Your Climate IQ Climate change is one of the most urgent environmental challenges of our time. But how much do you know about it? Test your knowledge with this quiz! 1. How does the greenhouse effect work? Greenhouse gases reflect the sun's energy, causing it to warm the Earth. Greenhouse gases absorb the sun's energy, slowing or preventing heat from escaping into space. Greenhouse

  19. QUIZ: Test your Solar IQ | Department of Energy

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

    Solar IQ Think you know PV from CSP? Put your brainpower to the test with our solar energy quiz 1. How much solar energy reaches the Earth's surface at any given moment? 173 ...

  20. Special Inquiry: IO1HQ005 | Department of Energy

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

    Review of the Yucca Mountain Project, IO1HQ005 Special Inquiry: IO1HQ005 More Documents & Publications Special Inquiry: I01HQ003 Inquiry Report: I01IG001 Special Inquiry: SI-11-2...

  1. IoT Interoperability at Bosch

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

    Acquire d S oftwa re Innova tions , 2008 Bus ine s s proce s s ma na ge me nt Cloud-ba s e d IoT s olutions Acquiring P ros ys t (a nnounce d Fe brua ry 2015) P...

  2. FY06 I/O Integration Blueprint

    SciTech Connect (OSTI)

    Cupps, K; Fitzgerald, K; Gary, M; Shoopman, J; Hamilton, P; Loewe, B; Slavec, J; Smith, D; Fox, D; Southard, D; Wiltzuis, D; Allen, J; Bass, N; Boas, B; Connell, T; East, D; Gorda, B; Lawver, B; Louis, S; Quinn, T; Seager, M

    2006-04-06

    This document provides an understanding of the near and long term computing and I/O resources in the Secure Computing Facility (SCF) and Open Computing Facility (OCF). Requirements for data flows, storage capacities and transfer rates are determined. Recommendations are made for architectures, timeframes for major deliverables, and procurements for the next fiscal year.

  3. A brief parallel I/O tutorial.

    SciTech Connect (OSTI)

    Ward, H. Lee

    2010-03-01

    This document provides common best practices for the efficient utilization of parallel file systems for analysts and application developers. A multi-program, parallel supercomputer is able to provide effective compute power by aggregating a host of lower-power processors using a network. The idea, in general, is that one either constructs the application to distribute parts to the different nodes and processors available and then collects the result (a parallel application), or one launches a large number of small jobs, each doing similar work on different subsets (a campaign). The I/O system on these machines is usually implemented as a tightly-coupled, parallel application itself. It is providing the concept of a 'file' to the host applications. The 'file' is an addressable store of bytes and that address space is global in nature. In essence, it is providing a global address space. Beyond the simple reality that the I/O system is normally composed of a small, less capable, collection of hardware, that concept of a global address space will cause problems if not very carefully utilized. How much of a problem and the ways in which those problems manifest will be different, but that it is problem prone has been well established. Worse, the file system is a shared resource on the machine - a system service. What an application does when it uses the file system impacts all users. It is not the case that some portion of the available resource is reserved. Instead, the I/O system responds to requests by scheduling and queuing based on instantaneous demand. Using the system well contributes to the overall throughput on the machine. From a solely self-centered perspective, using it well reduces the time that the application or campaign is subject to impact by others. The developer's goal should be to accomplish I/O in a way that minimizes interaction with the I/O system, maximizes the amount of data moved per call, and provides the I/O system the most information about

  4. Standards for the wireless IoT

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

    ZigBee Alliance. All rights reserved. ZigBee Alliance Standards for the wireless IoT DOE Connected Lighting Workshop 16 November 2015 Roy Harvey, OSRAM SYLVANIA © ZigBee Alliance. All rights reserved. ZigBee in brief ZigBee Alliance was founded in 2002 Focus is on low-power wireless networking specifications, application standards, and certification programs for the Internet of Things Specifies all layers, from Application to Physical Addresses consumer, commercial, and industrial markets Broad

  5. Microsoft PowerPoint - Franklin System IO

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

    File Systems & IO Richard Gerber NERSC User Services RAGerber@lbl.gov NERSC Users Group Berkeley Lab Oakland, CA October 2, 2008 Oct. 2, 2008 NUG 2008, Berkeley Lab, NERSC Oakland Scientific Facility Outline * File Systems * System Layout * Best Practices * Details * Reference www.nersc.gov www.nersc.gov/nusers/systems/franklin Oct. 2, 2008 NUG 2008, Berkeley Lab, NERSC Oakland Scientific Facility Franklin File Systems Oct. 2, 2008 NUG 2008, Berkeley Lab, NERSC Oakland Scientific Facility

  6. Interface for Parallel I/O from Componentized Visualization Algorithms

    Energy Science and Technology Software Center (OSTI)

    2008-09-16

    The software is an interface layer over file I/O with features specifically designed for efficient parallel reads and writes. The interface provides multiple concrete implementations that easily allow the replacement of one interface with another. This feature allows a reader or writer implementation to work independently of whether parallel file I/O is available or desired. The software also contains extensions to some readers to allow it to use the file I/O functionality.

  7. mira_boot_camp_2016_harms_io

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

    and Challenges of Portable I/O with Best Practices Scaling Your Science 2016 Kevin Harms - harms@alcf.anl.gov Venkat Vishwanath Phil Carns Rob Latham Storage vs Computation Trend 2 ASC Sequoia 20 PF/s Compute 500GB/s Storage ASCI Red Mira Mira I/O Infrastructure Overview 3 Infiniband QDR SAN Cooley Compute I/O Node mira-fs0 (GPFS) mira-fs1 (GPFS) mira-home (GPFS) Infiniband FDR Cetus Storage resources Mira I/O Infrastructure 4 BG/Q Optical 2x16 Gbit/sec QDR InfiniBand 32 Gbit/sec Serial ATA 6.0

  8. mira_boot_camp_2015_harms_io.pptx

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

    Mira Boot Camp 2015 Kevin Harms - harms@alcf.anl.gov Venkat Vishwanath Phil Carns Rob Latham Mira Mira I/O Infrastructure Overview 2 Infiniband QDR S AN Tukey Cooley Compute I/O N ode mira---fs0 (GPFS) mira---fs1 (GPFS) mira---home (GPFS) Infiniband FDR Cetus Storage r esources Mira I/O Infrastructure 3 BG/Q Optical 2x16 Gbit/sec QDR InfiniBand 32 Gbit/sec Serial ATA 6.0 Gbit/sec Gateway nodes run parallel file system client software and forward I/O operations from HPC clients. 384 16-core

  9. File storage and I/O

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

    O File storage and I/O JGI SCAVENGER HUNT - CLICK HERE There are 5 main user file spaces available on Genepool/Phoebe (soon to be 4 once House is retired on December 20, 2013). $HOME Your home directory on Genepool mounted across all NERSC systems. You should refer to this home directory as $HOME where ever possible. If you had an old home directory at JGI, on /house or on the netapps we recommend you refer to this old home directory as $OLD_HOME. You should not change the environment variable

  10. Livermore Random I/O Testbench

    Energy Science and Technology Software Center (OSTI)

    2012-09-01

    LRIOT is a test bench framework that is designed to generate sophisticated I/O rates that can stress high-performance memory and storage systems, such as non-volatile random access memories (NVRAM)and storage class memory. Furthermore, LRIOT provides the capabilities to mix multiple types of concurrency, namely threading and task parallelism, as well as distributed execution using Message Passing Interface (MPI) libraries. It will be used by algorithm designers to generate access patterns that mimic their application's behavior,more » and by system designers to test high-performance NVRAM storage.« less

  11. Requirements for Parallel I/O,

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

    Requirements for Parallel I/O, ! Visualization and Analysis Prabhat 1 , Q uincey K oziol 2 1 LBL/NERSC 2 The H DF G roup NERSC A SCR R equirements f or 2 017 January 1 5, 2 014 LBNL 1. Project Description! * m636 r epo * LBL V is B ase P rogram ( Bethel P I) [ PM: N owell] * Conduct f undamental a nd a pplied vis/analyEcs R &D t o address e xascale c hallenges * ExaHDF5 P roject ( Prabhat, Q uincey P Is) [ PM: Nowell] * Scale P arallel I /O, a nd d ata m anagement t echnologies f or current

  12. Parallel I/O Software Infrastructure for Large-Scale Systems

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

    Parallel IO Software Infrastructure for Large-Scale Systems Parallel IO Software Infrastructure for Large-Scale Systems Choudhary.png An illustration of how MPI---IO file domain...

  13. V-115: Apple iOS Bugs Let Local Users Gain Elevated Privileges...

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

    5: Apple iOS Bugs Let Local Users Gain Elevated Privileges V-115: Apple iOS Bugs Let Local Users Gain Elevated Privileges March 20, 2013 - 12:08am Addthis PROBLEM: Apple iOS Bugs...

  14. Multi-Purpose, Application-Centric, Scalable I/O Proxy Application

    Energy Science and Technology Software Center (OSTI)

    2015-06-15

    MACSio is a Multi-purpose, Application-Centric, Scalable I/O proxy application. It is designed to support a number of goals with respect to parallel I/O performance testing and benchmarking including the ability to test and compare various I/O libraries and I/O paradigms, to predict scalable performance of real applications and to help identify where improvements in I/O performance can be made within the HPC I/O software stack.

  15. Remote I/O : fast access to distant storage.

    SciTech Connect (OSTI)

    Foster, I.; Kohr, D., Jr.; Krishnaiyer, R.; Mogill, J.

    1997-12-17

    As high-speed networks make it easier to use distributed resources, it becomes increasingly common that applications and their data are not colocated. Users have traditionally addressed this problem by manually staging data to and from remote computers. We argue instead for a new remote I/O paradigm in which programs use familiar parallel I/O interfaces to access remote file systems. In addition to simplifying remote execution, remote I/O can improve performance relative to staging by overlapping computation and data transfer or by reducing communication requirements. However, remote I/O also introduces new technical challenges in the areas of portability, performance, and integration with distributed computing systems. We propose techniques designed to address these challenges and describe a remote I/O library called RIO that we have developed to evaluate the effectiveness of these techniques. RIO addresses issues of portability by adopting the quasi-standard MPI-IO interface and by defining a RIO device and RIO server within the ADIO abstract I/O device architecture. It addresses performance issues by providing traditional I/O optimizations such as asynchronous operations and through implementation techniques such as buffering and message forwarding to off load communication overheads. RIO uses the Nexus communication library to obtain access to configuration and security mechanisms provided by the Globus wide area computing tool kit. Microbenchmarks and application experiments demonstrate that our techniques achieve acceptable performance in most situations and can improve turnaround time relative to staging.

  16. ALCF I/O Data Repository (Technical Report) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Technical Report: ALCF IO Data Repository Citation Details In-Document Search Title: ALCF IO Data Repository You are accessing a document from the Department of Energy's (DOE) ...

  17. U-138: Cisco IOS IPSec IKE Unspecified Denial of Service Vulnerability |

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

    Department of Energy 38: Cisco IOS IPSec IKE Unspecified Denial of Service Vulnerability U-138: Cisco IOS IPSec IKE Unspecified Denial of Service Vulnerability April 2, 2012 - 7:00am Addthis PROBLEM: A vulnerability has been reported in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service). PLATFORM: Cisco IOS XE 2.1.x Cisco IOS XE 2.2.x Cisco IOS XE 2.3.x Cisco IOS XE 2.4.x Cisco IOS XE 2.5.x Cisco IOS XE 2.6.x Cisco IOS XE 3.1.x Cisco IOS XE 3.3.x

  18. A Comprehensive Look at High Performance Parallel I/O

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

    A Comprehensive Look at High Performance Parallel I/O A Comprehensive Look at High Performance Parallel I/O Book Signing @ SC14! Nov. 18, 5 p.m. in Booth 1939 November 10, 2014 Contact: Linda Vu, +1 510 495 2402, lvu@lbl.gov HighPerf Parallel IO In the 1990s, high performance computing (HPC) made a dramatic transition to massively parallel processors. As this model solidified over the next 20 years, supercomputing performance increased from gigaflops-billions of calculations per second-to

  19. Balancing I/Q data in radar range-Doppler images. (Conference...

    Office of Scientific and Technical Information (OSTI)

    Title: Balancing IQ data in radar range-Doppler images. Abstract not provided. Authors: Doerry, Armin Walter Publication Date: 2015-01-01 OSTI Identifier: 1244856 Report ...

  20. Edison-IO-CUG2014-paper-Zhao

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

    ... Since each compute node has perfectly balanced IO workload, and does not do any computing... size of a file that both the read and write-through caches will try to keep in memory. ...

  1. A Comprehensive Look at High Performance Parallel I/O

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

    In this era of "big data," high performance parallel IO-the way disk drives efficiently read and write information on HPC systems-is extremely important. Yet the last book to ...

  2. Letter Report: IO1OP001 | Department of Energy

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

    2 Department of Energy's Purchase Card programs and the lessons learned. Letter Report: IO1OP001 More Documents & Publications Audit Report: WR-B-02-03 Inspection Report:...

  3. Current parallel I/O limitations to scalable data analysis.

    SciTech Connect (OSTI)

    Mascarenhas, Ajith Arthur; Pebay, Philippe Pierre

    2011-07-01

    This report describes the limitations to parallel scalability which we have encountered when applying our otherwise optimally scalable parallel statistical analysis tool kit to large data sets distributed across the parallel file system of the current premier DOE computational facility. This report describes our study to evaluate the effect of parallel I/O on the overall scalability of a parallel data analysis pipeline using our scalable parallel statistics tool kit [PTBM11]. In this goal, we tested it using the Jaguar-pf DOE/ORNL peta-scale platform on a large combustion simulation data under a variety of process counts and domain decompositions scenarios. In this report we have recalled the foundations of the parallel statistical analysis tool kit which we have designed and implemented, with the specific double intent of reproducing typical data analysis workflows, and achieving optimal design for scalable parallel implementations. We have briefly reviewed those earlier results and publications which allow us to conclude that we have achieved both goals. However, in this report we have further established that, when used in conjuction with a state-of-the-art parallel I/O system, as can be found on the premier DOE peta-scale platform, the scaling properties of the overall analysis pipeline comprising parallel data access routines degrade rapidly. This finding is problematic and must be addressed if peta-scale data analysis is to be made scalable, or even possible. In order to attempt to address these parallel I/O limitations, we will investigate the use the Adaptable IO System (ADIOS) [LZL+10] to improve I/O performance, while maintaining flexibility for a variety of IO options, such MPI IO, POSIX IO. This system is developed at ORNL and other collaborating institutions, and is being tested extensively on Jaguar-pf. Simulation code being developed on these systems will also use ADIOS to output the data thereby making it easier for other systems, such as ours, to

  4. Hf-irJ

    Office of Legacy Management (LM)

    Hf-irJ jnj,4 States Governmen Department of Energy Inemorandum DOTE: DAY o 1S5a . 7 EPY TO F . O 0 NE-24 SUJEC': Authorization for Remedial Action of Residential Vicinity ...

  5. I/O Performance of Virtualized Cloud Environments

    SciTech Connect (OSTI)

    Ghoshal, Devarshi; Canon, Shane; Ramakrishnan, Lavanya

    2011-11-03

    The scientific community is exploring the suitability of cloud infrastructure to handle High Performance Computing (HPC) applications. The goal of Magellan, a project funded through DOE ASCR, is to investigate the potential role of cloud computing to address the computing needs of the Department of Energy?s Office of Science, especially for mid-range computing and data-intensive applications which are not served through existing DOE centers today. Prior work has shown that applications with significant communication orI/O tend to perform poorly in virtualized cloud environments. However, there is a limited understanding of the I/O characteristics in virtualized cloud environments. This paper will present our results in benchmarking the I/O performance over different cloud and HPC platforms to identify the major bottlenecks in existing infrastructure. We compare the I/O performance using IOR benchmark on two cloud platforms - Amazon and Magellan. We analyze the performance of different storage options available, different instance types in multiple availability zones. Finally, we perform large-scale tests in order to analyze the variability in the I/O patterns over time and region. Our results highlight the overhead and variability in I/O performance on both public and private cloud solutions. Our results will help applications decide between the different storage options enabling applications to make effective choices.

  6. I/O Performance of a Large-Scale, Interpreter-Driven Laser-Plasma...

    Office of Scientific and Technical Information (OSTI)

    Conference: IO Performance of a Large-Scale, Interpreter-Driven Laser-Plasma Interaction Code Citation Details In-Document Search Title: IO Performance of a Large-Scale, ...

  7. 01 Team Black_Presentation _LANL?s PaScalBB IO.pptx

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

    multiple 10-Gigabit Ethernet bonding Small-scale PaScalBB test bed and conduct a sequence of IO node performance tests. Discovery of enhanced IO node network...

  8. An Optimizing Compiler for Petascale I/O on Leadership Class Architectures

    SciTech Connect (OSTI)

    Choudhary, Alok; Kandemir, Mahmut

    2015-03-18

    In high-performance computing systems, parallel I/O architectures usually have very complex hierarchies with multiple layers that collectively constitute an I/O stack, including high-level I/O libraries such as PnetCDF and HDF5, I/O middleware such as MPI-IO, and parallel file systems such as PVFS and Lustre. Our project explored automated instrumentation and compiler support for I/O intensive applications. Our project made significant progress towards understanding the complex I/O hierarchies of high-performance storage systems (including storage caches, HDDs, and SSDs), and designing and implementing state-of-the-art compiler/runtime system technology that targets I/O intensive HPC applications that target leadership class machine. This final report summarizes the major achievements of the project and also points out promising future directions.

  9. T-611: Cisco IOS OCSP Revoked Certificate Security Issue

    Broader source: Energy.gov [DOE]

    The PKI functionality in Cisco IOS 15.0 and 15.1 does not prevent permanent caching of certain public keys, which allows remote attackers to bypass authentication and have unspecified other impact by leveraging an IKE peer relationship in which a key was previously valid but later revoked, aka Bug ID CSCth82164, a different vulnerability than CVE-2010-4685.

  10. Edison-IO-CUG2014-presentation-final.pptx

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

    a N ERSC u ser, f or p roviding I OBUF t est d ata with a Q LUA c ode. * Harvey W ... The r ead r ate o f t he M PI---IO 1 0k r ead---aher---write t est d eclines s teeply, w ...

  11. V-165: Cisco WebEx for iOS Certificate Validation Flaw Lets Remote Users

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

    Spoof the Server | Department of Energy 65: Cisco WebEx for iOS Certificate Validation Flaw Lets Remote Users Spoof the Server V-165: Cisco WebEx for iOS Certificate Validation Flaw Lets Remote Users Spoof the Server May 28, 2013 - 12:46am Addthis PROBLEM: Cisco WebEx for iOS Certificate Validation Flaw Lets Remote Users Spoof the Server PLATFORM: Cisco WebEx for iOS 4.1, Other versions may also be affected. ABSTRACT: A vulnerability was reported in Cisco WebEx for iOS. REFERENCE LINKS:

  12. I\r'

    Office of Legacy Management (LM)

    r' ( g-.] ic' fz .; w .fl ! : L ' ..j : i ?- z -2"" . 2,-3X-~ Aw23-t 11, 1949 J c. s. ?.%omic ?zaru ccm3ission 7-t i-~n,~-;ra-& 3&-p.Cz' ;"ica P. ' 3. 30x 3 Eacsrs 17, lIaw York :. , ::; /. 1 httetii OP J xl-. P, 3. 2gp C+~t~Sil;lsXl t ?~~$Tly~lf .t: GA.3 L?wjpnaJiQn Of p-3&7:2-Liop 9.0";:7~+50 s' , -ir ,.,,3 iashlla+im it i3 our da3irs 20 be rslia-T.73 of _"\L:t&?T --:wzk&ili* of the SC1298 ' _ _ Zj31Wf end i~i3sio~~31.3 rsskeri31ii izxLi.c~~t&

  13. Message Passage Interface Input/Output (MPI-IO Test) Version 1.0

    Energy Science and Technology Software Center (OSTI)

    2005-04-08

    Although there a host of existing file system and I/O test programs available, most were not designed with parallel I/O in mind and are not useful at the scale of our clusters. Los Alamos National Lab's MPI-IO test was written with I/O and scale in mind. The MPI-IO test is built on top of MPI's I/O calls and is used to gather timing information for reading from and writing to file(s) using a variety ofmore » I/O profiles; N processes writing to N files, N processes writing to one file, N processes sending data to m processes writing to m files, or n processes sending data to m processes to one file. A data aggregation capability is available and the user can pass down MPI-IO, ROMIO and some file system specific MPI hints. By default, the MPI-IO Test will write and specific pattern to a file, close the file, open the file for read, read the data, check for data integrity and close the file. Timing information is reported for file open, close, read and write data rates, and effective bandwidths. The MPI-IO Test can be used for performance benchmarking and, in some cases, to diagnost problems with file systems or I/O networks.« less

  14. IR Spot Weld Inspect

    Energy Science and Technology Software Center (OSTI)

    2014-01-01

    In automotive industry, destructive inspection of spot welds is still the mandatory quality assurance method due to the lack of efficient non-destructive evaluation (NDE) tools. However, it is costly and time-consuming. Recently at ORNL, a new NDE prototype system for spot weld inspection using infrared (IR) thermography has been developed to address this problem. This software contains all the key functions that ensure the NDE system to work properly: system input/output control, image acquisition, datamore » analysis, weld quality database generation and weld quality prediction, etc.« less

  15. D0 Cryogenic System Superconducting Solenoid Platform I/O

    SciTech Connect (OSTI)

    Markley, D.; /Fermilab

    1997-10-09

    The Dzero detector is scheduled for a major upgrade between 1996 and 1999. This note describes the specifications and configuration of the physical Input/Output devices and instrumentation of the 2 Tesla Superconducting Solenoid. The Solenoid and the VLPC cryostats both reside on the detector platform and are cooled by the Dzero Helium Refrigerator. The cryogenic process control s for these two components will be an extension of the TI565 programmable logic controller system used for other Dzero cryogenic controls. Two Input/Output Bases will be installed on the Dzero detector platform near the cryo corner. These I/O bases will handle all the sensor input and process control output devices from the Solenoid and VLPC cryostats. Having the I/O bases installed on the detector platform makes the connecting cabl ing to the platform much easier . All the instruments are wired directly to the I/O base. The bases have only one communications network cabl e that must be routed off the platform to the South side of the Dzero building.

  16. OPAL: An Open-Source MPI-IO Library over Cray XT

    SciTech Connect (OSTI)

    Yu, Weikuan; Vetter, Jeffrey S; Canon, Richard Shane

    2007-01-01

    Parallel IO over Cray XT is supported by a vendor-supplied MPI-IO package. This package contains a proprietary ADIO implementation built on top of the sysio library. While it is reasonable to maintain a stable code base for application scientists' convenience, it is also very important to the system developers and researchers to analyze and assess the effectiveness of parallel IO software, and accordingly, tune and optimize the MPI-IO implementation. A proprietary parallel IO code base relinquishes such flexibilities. On the other hand, a generic UFS-based MPI-IO implementation is typically used on many Linux-based platforms. We have developed an open-source MPI-IO package over Lustre, referred to as OPAL (OPportunistic and Adaptive MPI-IO Library over Lustre). OPAL provides a single source-code base for MPI-IO over Lustre on Cray XT and Linux platforms. Compared to Cray implementation, OPAL provides a number of good features, including arbitrary specification of striping patterns and Lustre-stripe aligned file domain partitioning. This paper presents the performance comparisons between OPAL and Cray's proprietary implementation. Our evaluation demonstrates that OPAL achieves the performance comparable to the Cray implementation. We also exemplify the benefits of an open source package in revealing the underpinning of the parallel IO performance.

  17. VisIO: enabling interactive visualization of ultra-scale, time-series data via high-bandwidth distributed I/O systems

    SciTech Connect (OSTI)

    Mitchell, Christopher J; Ahrens, James P; Wang, Jun

    2010-10-15

    Petascale simulations compute at resolutions ranging into billions of cells and write terabytes of data for visualization and analysis. Interactive visuaUzation of this time series is a desired step before starting a new run. The I/O subsystem and associated network often are a significant impediment to interactive visualization of time-varying data; as they are not configured or provisioned to provide necessary I/O read rates. In this paper, we propose a new I/O library for visualization applications: VisIO. Visualization applications commonly use N-to-N reads within their parallel enabled readers which provides an incentive for a shared-nothing approach to I/O, similar to other data-intensive approaches such as Hadoop. However, unlike other data-intensive applications, visualization requires: (1) interactive performance for large data volumes, (2) compatibility with MPI and POSIX file system semantics for compatibility with existing infrastructure, and (3) use of existing file formats and their stipulated data partitioning rules. VisIO, provides a mechanism for using a non-POSIX distributed file system to provide linear scaling of 110 bandwidth. In addition, we introduce a novel scheduling algorithm that helps to co-locate visualization processes on nodes with the requested data. Testing using VisIO integrated into Para View was conducted using the Hadoop Distributed File System (HDFS) on TACC's Longhorn cluster. A representative dataset, VPIC, across 128 nodes showed a 64.4% read performance improvement compared to the provided Lustre installation. Also tested, was a dataset representing a global ocean salinity simulation that showed a 51.4% improvement in read performance over Lustre when using our VisIO system. VisIO, provides powerful high-performance I/O services to visualization applications, allowing for interactive performance with ultra-scale, time-series data.

  18. T-676: Apple iOS Certificate Chain Validation Flaw Lets Certain Remote

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

    Users Access or Modify SSL/TLS Sessions | Department of Energy 76: Apple iOS Certificate Chain Validation Flaw Lets Certain Remote Users Access or Modify SSL/TLS Sessions T-676: Apple iOS Certificate Chain Validation Flaw Lets Certain Remote Users Access or Modify SSL/TLS Sessions July 26, 2011 - 1:06am Addthis PROBLEM: A vulnerability was reported in Apple iOS. A remote user with the ability to conduct a man-in-the-middle attack can access or modify SSL/TLS sessions. PLATFORM: iOS 4.2.5

  19. The IQ-wall and IQ-station -- harnessing our collective intelligence to realize the potential of ultra-resolution and immersive visualization

    SciTech Connect (OSTI)

    Eric A. Wernert; William R. Sherman; Chris Eller; David Reagan; Patrick D. Beard; Eric T. Whiting; Patrick O'Leary

    2012-03-01

    We present a pair of open-recipe, affordably-priced, easy-to-integrate, and easy-to-use visualization systems. The IQ-wall is an ultra-resolution tiled display wall that scales up to 24 screens with a single PC. The IQ-station is a semi-immersive display system that utilizes commodity stereoscopic displays, lower cost tracking systems, and touch overlays. These systems have been designed to support a wide range of research, education, creative activities, and information presentations. They were designed to work equally well as stand-alone installations or as part of a larger distributed visualization ecosystem. We detail the hardware and software components of these systems, describe our deployments and experiences in a variety of research lab and university environments, and share our insights for effective support and community development.

  20. ARM - Datastreams - goes7ir

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

    ir Documentation XDC documentation Data Quality Plots ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Datastream : GOES7IR GOES-7: infrared, channels 7, 10, 12

  1. An Optimizing Compiler for Petascale I/O on Leadership-Class Architectures

    SciTech Connect (OSTI)

    Kandemir, Mahmut Taylan; Choudary, Alok; Thakur, Rajeev

    2014-03-01

    In high-performance computing (HPC), parallel I/O architectures usually have very complex hierarchies with multiple layers that collectively constitute an I/O stack, including high-level I/O libraries such as PnetCDF and HDF5, I/O middleware such as MPI-IO, and parallel file systems such as PVFS and Lustre. Our DOE project explored automated instrumentation and compiler support for I/O intensive applications. Our project made significant progress towards understanding the complex I/O hierarchies of high-performance storage systems (including storage caches, HDDs, and SSDs), and designing and implementing state-of-the-art compiler/runtime system technology that targets I/O intensive HPC applications that target leadership class machine. This final report summarizes the major achievements of the project and also points out promising future directions Two new sections in this report compared to the previous report are IOGenie and SSD/NVM-specific optimizations.

  2. IR-2003- | Department of Energy

    Energy Savers [EERE]

    IR-2003- (20.04 KB) More Documents & Publications Fact Sheet: Clean Coal Technology Ushers In New Era in Energy Fact Sheet: Clean Coal Technology Ushers In New Era in Energy ...

  3. Microsoft PowerPoint - Lee.Ward_Salishan-FY06-IO-Overview-GGrider

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

    Overview of I/O systems, technology, and directions Gary Grider, LANL LA-UR 06-0397 01/2006 Salishan FY06 What drives us? *Provide reliable, easy-to-use, high-performance, scalable, and secure, I/O *Via standard and other interfaces *MPI-IO, POSIX, etc. Archive Site Backbone Past Gener- ation ASCI Platform Current Gener- ation ASCI Platform Disk Rich Supercomputer Disk Rich Supercomputer Balanced System Approach Disk Poor Clients Diskless Clients Object Archive cluster File System Gateways

  4. Microsoft PowerPoint - Salishan-FY06-IO-Keynote-GGrider

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

    HPC I/O and File Systems, is everyone out to get us? Gary Grider, LANL LA-UR-06-1122 02/2006 Salishan FY06 What drives us? *Provide reliable, easy-to-use, high-performance, scalable, and secure, I/O *Via standard and other interfaces *MPI-IO, POSIX, etc. Archive Site Backbone Past Gener- ation ASCI Platform Current Gener- ation ASCI Platform Disk Rich Supercomputer Disk Rich Supercomputer Balanced System Approach Disk Poor Clients Diskless Clients Object Archive cluster File System Gateways

  5. U-165: Apple iOS Bugs Let Remote Users Execute Arbitrary Code...

    Energy Savers [EERE]

    iOS. A remote user can cause arbitrary code to be executed on the target user's system. ... A remote user can create a specially crafted file that, when loaded by the target user, ...

  6. High-Performance I/O: HDF5 for Lattice QCD

    SciTech Connect (OSTI)

    Kurth, Thorsten; Pochinsky, Andrew; Sarje, Abhinav; Syritsyn, Sergey; Walker-Loud, Andre

    2015-01-01

    Practitioners of lattice QCD/QFT have been some of the primary pioneer users of the state-of-the-art high-performance-computing systems, and contribute towards the stress tests of such new machines as soon as they become available. As with all aspects of high-performance-computing, I/O is becoming an increasingly specialized component of these systems. In order to take advantage of the latest available high-performance I/O infrastructure, to ensure reliability and backwards compatibility of data files, and to help unify the data structures used in lattice codes, we have incorporated parallel HDF5 I/O into the SciDAC supported USQCD software stack. Here we present the design and implementation of this I/O framework. Our HDF5 implementation outperforms optimized QIO at the 10-20% level and leaves room for further improvement by utilizing appropriate dataset chunking.

  7. BASIN BLAN CO BLAN CO S OT ERO IGNAC IO-BLANCO AZ TEC BALLAR

    U.S. Energy Information Administration (EIA) Indexed Site

    BOE Reserve Class No 2001 reserves 0.1 - 10 MBOE 10.1 - 100 MBOE 100.1 - 1,000 MBOE 1,000.1- 10,000 MBOE 10,000.1 - 100,000 MBOE > 100,000 MBOE Basin Outline AZ UT NM CO 1 2 Index Map for 2 Paradox-San Juan Panels 2001 Reserve Summary for All Paradox-San Juan Basin Fields Total Total Total Number Liquid Gas BOE of Reserves Reserves Reserves Fields (Mbbl) (MMcf) (Mbbl) Paradox-San Juan 250 174,193 20,653,622 3,616,464 Basin CO NM IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC IO-BLANCO

  8. BASIN BLAN CO BLAN CO S OT ERO IGNAC IO-BLANCO AZ TEC BALLAR

    U.S. Energy Information Administration (EIA) Indexed Site

    Liquids Reserve Class No 2001 liquids reserves 0.1 - 10 Mbbl 10.1 - 100 Mbbl 100.1 - 1,000 Mbbl 1,000.1- 10,000 Mbbl 10,000.1 - 100,000 Mbbl Basin Outline AZ UT NM CO 1 2 Index Map for 2 Paradox-San Juan Panels 2001 Reserve Summary for All Paradox-San Juan Basin Fields Total Total Total Number Liquid Gas BOE of Reserves Reserves Reserves Fields (Mbbl) (MMcf) (Mbbl) Paradox-San Juan 250 174,193 20,653,622 3,616,464 Basin CO NM IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC

  9. Theoretical studies of Ir5Th and Ir5Ce nanoscale precipitates in Ir

    SciTech Connect (OSTI)

    Morris, James R; Averill, Frank; Cooper, Valentino R

    2014-01-01

    Experimentally, it is known that very small amounts of thorium and/or cerium added to iridium metal form a precipitate, Ir5Th / Ir5Ce, which improves the high temperature mechanical properties of the resulting alloys. We demonstrate that there are low-energy configurations for nano-scale precipitates of these phases in Ir, and that these coherent arrangements may assist in producing improved mechanical properties. One precipitate/matrix orientation gives a particularly low interfacial energy, and a low lattice misfit. Nanolayer precipitates with this orientation are found to be likely to form, with little driving force to coarsen. The predicted morphology of the precipitates and their orientation with the matrix phase provide a potential experiment that could be used to test these predictions.

  10. Active Storage with Analytics Capabilities and I/O Runtime System for Petascale Systems

    SciTech Connect (OSTI)

    Choudhary, Alok

    2015-03-18

    Computational scientists must understand results from experimental, observational and computational simulation generated data to gain insights and perform knowledge discovery. As systems approach the petascale range, problems that were unimaginable a few years ago are within reach. With the increasing volume and complexity of data produced by ultra-scale simulations and high-throughput experiments, understanding the science is largely hampered by the lack of comprehensive I/O, storage, acceleration of data manipulation, analysis, and mining tools. Scientists require techniques, tools and infrastructure to facilitate better understanding of their data, in particular the ability to effectively perform complex data analysis, statistical analysis and knowledge discovery. The goal of this work is to enable more effective analysis of scientific datasets through the integration of enhancements in the I/O stack, from active storage support at the file system layer to MPI-IO and high-level I/O library layers. We propose to provide software components to accelerate data analytics, mining, I/O, and knowledge discovery for large-scale scientific applications, thereby increasing productivity of both scientists and the systems. Our approaches include 1) design the interfaces in high-level I/O libraries, such as parallel netCDF, for applications to activate data mining operations at the lower I/O layers; 2) Enhance MPI-IO runtime systems to incorporate the functionality developed as a part of the runtime system design; 3) Develop parallel data mining programs as part of runtime library for server-side file system in PVFS file system; and 4) Prototype an active storage cluster, which will utilize multicore CPUs, GPUs, and FPGAs to carry out the data mining workload.

  11. OpenMortar.io: An Extensible Sensing and Control Platform for Building Energy Management

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

    OpenMortar.io: An Extensible Sensing and Control Platform for Building Energy Management 2014 Building Technologies Office Peer Review Anthony Rowe, agr@ece.cmu.edu Carnegie Mellon University Project Summary Timeline: Start date: November 2013 (New Project) Planned end date: November 2016 Key Milestones 1. Functional Requirement Analysis; 03/14 2. First Version of Mortar.io; 04/14 Key Partners: Bosch RTC Lutron Electronics 3. Benchtop HVAC, Lighting, CMEL Integration; 10/14 4. Deploy in Scaife

  12. GLEAN: Scalable In Situ Analysis and I/O Acceleration on Leadership

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

    Computing Systems | Argonne Leadership Computing Facility GLEAN: Scalable In Situ Analysis and I/O Acceleration on Leadership Computing Systems GLEAN is a flexible and extensible framework that takes application, analysis, and system characteristics into account to facilitate simulation-time data analysis and I/O acceleration. The GLEAN infrastructure hides significant details from the end user, while at the same time providing a flexible intterface to the fastest path for their data and

  13. IRS Parking Facility Lighting Retrofit Reduces Annual Energy...

    Office of Environmental Management (EM)

    IRS Parking Facility Lighting Retrofit Reduces Annual Energy Use by 76% IRS Parking Facility Lighting Retrofit Reduces Annual Energy Use by 76% IRS Parking Facility Lighting ...

  14. Understanding I/O workload characteristics of a Peta-scale storage system

    SciTech Connect (OSTI)

    Kim, Youngjae; Gunasekaran, Raghul

    2015-01-01

    Understanding workload characteristics is critical for optimizing and improving the performance of current systems and software, and architecting new storage systems based on observed workload patterns. In this paper, we characterize the I/O workloads of scientific applications of one of the world s fastest high performance computing (HPC) storage cluster, Spider, at the Oak Ridge Leadership Computing Facility (OLCF). OLCF flagship petascale simulation platform, Titan, and other large HPC clusters, in total over 250 thousands compute cores, depend on Spider for their I/O needs. We characterize the system utilization, the demands of reads and writes, idle time, storage space utilization, and the distribution of read requests to write requests for the Peta-scale Storage Systems. From this study, we develop synthesized workloads, and we show that the read and write I/O bandwidth usage as well as the inter-arrival time of requests can be modeled as a Pareto distribution. We also study the I/O load imbalance problems using I/O performance data collected from the Spider storage system.

  15. An evaluation of Java's I/O capabilities for high-performance computing.

    SciTech Connect (OSTI)

    Dickens, P. M.; Thakur, R.

    2000-11-10

    Java is quickly becoming the preferred language for writing distributed applications because of its inherent support for programming on distributed platforms. In particular, Java provides compile-time and run-time security, automatic garbage collection, inherent support for multithreading, support for persistent objects and object migration, and portability. Given these significant advantages of Java, there is a growing interest in using Java for high-performance computing applications. To be successful in the high-performance computing domain, however, Java must have the capability to efficiently handle the significant I/O requirements commonly found in high-performance computing applications. While there has been significant research in high-performance I/O using languages such as C, C++, and Fortran, there has been relatively little research into the I/O capabilities of Java. In this paper, we evaluate the I/O capabilities of Java for high-performance computing. We examine several approaches that attempt to provide high-performance I/O--many of which are not obvious at first glance--and investigate their performance in both parallel and multithreaded environments. We also provide suggestions for expanding the I/O capabilities of Java to better support the needs of high-performance computing applications.

  16. The parallel I/O architecture of the High Performance Storage System (HPSS)

    SciTech Connect (OSTI)

    Watson, R.W.; Coyne, R.A.

    1995-02-01

    Rapid improvements in computational science, processing capability, main memory sizes, data collection devices, multimedia capabilities and integration of enterprise data are producing very large datasets (10s-100s of gigabytes to terabytes). This rapid growth of data has resulted in a serious imbalance in I/O and storage system performance and functionality. One promising approach to restoring balanced I/O and storage system performance is use of parallel data transfer techniques for client access to storage, device-to-device transfers, and remote file transfers. This paper describes the parallel I/O architecture and mechanisms, Parallel Transport Protocol, parallel FIP, and parallel client Application Programming Interface (API) used by the High Performance Storage System (HPSS). Parallel storage integration issues with a local parallel file system are also discussed.

  17. BASIN BLAN CO BLAN CO S OT ERO IGNAC IO-BLANCO AZ TEC BALLAR

    U.S. Energy Information Administration (EIA) Indexed Site

    Gas Reserve Class No 2001 gas reserves 0.1 - 10 MMCF 10.1 - 100 MMCF 100.1 - 1,000 MMCF 1,000.1- 10,000 MMCF 10,000.1 - 100,000 MMCF > 100,000 MMCF Basin Outline AZ UT NM CO 1 2 Index Map for 2 Paradox-San Juan Panels 2001 Reserve Summary for All Paradox-San Juan Basin Fields Total Total Total Number Liquid Gas BOE of Reserves Reserves Reserves Fields (Mbbl) (MMcf) (Mbbl) Paradox-San Juan 250 174,193 20,653,622 3,616,464 Basin CO NM IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC IO-BLANCO IGNAC

  18. I/O values for determination of the origin of some indoor organic pollutants

    SciTech Connect (OSTI)

    Otson, R.; Zhu, J.

    1997-12-31

    To reduce human health risks resulting from exposure to toxic chemicals, it is important to determine the origin of such substances. The ratio (I/O) of indoor to outdoor concentrations of selected airborne vapor phase organic compounds (VPOC) was used to estimate the contribution of indoor sources to levels of the compounds in the air of 44 homes selected randomly in the Greater Toronto Area (GTA). Average I/O values for all of the homes were greater 1.5 for 10 of the 20 detected target compounds, and it could be concluded that indoor VPOC sources had a greater impact on indoor air quality than outdoor air in these instances. A significant finding, which aptly demonstrates the importance of indoor sources and pollution, was the overall I/O value of 5.2 for the 44 representative GTA homes. Possible indoor sources for most of the 10 compounds could be identified, based on information collected by means of a questionnaire, as well as from the scientific literature. However, possible sources for some compounds could not be determined as readily, probably because of the presence of multiple sources, and sources which had not been previously noted, such as foods and beverages. The sensitivity of I/O values to various factors (e.g., source strength, air exchange rates, precision of measurements, unanticipated sources), and the reliability of determining the origin of pollutants by use of I/O values alone were examined, with some examples. If used judiciously, the I/O value can be a useful tool for IAQ investigations.

  19. Extending the POSIX I/O interface: a parallel file system perspective.

    SciTech Connect (OSTI)

    Vilayannur, M.; Lang, S.; Ross, R.; Klundt, R.; Ward, L.; Mathematics and Computer Science; VMWare, Inc.; SNL

    2008-12-11

    The POSIX interface does not lend itself well to enabling good performance for high-end applications. Extensions are needed in the POSIX I/O interface so that high-concurrency HPC applications running on top of parallel file systems perform well. This paper presents the rationale, design, and evaluation of a reference implementation of a subset of the POSIX I/O interfaces on a widely used parallel file system (PVFS) on clusters. Experimental results on a set of micro-benchmarks confirm that the extensions to the POSIX interface greatly improve scalability and performance.

  20. Parallel I/O performance: From Events to Ensembles | Argonne Leadership

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

    Computing Facility Parallel I/O performance: From Events to Ensembles Authors: Uselton, A.; Howison, M.; Wright, N.J.; Skinner, D.; Keen, N.; Shalf, J.; Karavanic, K.L. Oliker, L.; Parallel I/O is fast becoming a bottleneck to the research agendas of many users of extreme scale parallel computers. The principle cause of this is the concurrency explosion of high-end computation, coupled with the complexity of providing parallel file systems that perform reliably at such scales. More than just

  1. Theoretical investigations of the IO,{sup q+} (q = 2, 3, 4) multi-charged ions: Metastability, characterization and spectroscopy

    SciTech Connect (OSTI)

    Hammami, H.; Yazidi, O.; Ben El Hadj Rhouma, M.; Al Mogren, M. M.; Hochlaf, M.

    2014-07-07

    Using ab initio methodology, we studied the IO{sup q+} (q = 2, 3, 4) multi-charged ions. Benchmark computations on the IO(X{sup 2}Π) neutral species allow validate the current procedure. For IO{sup 2+}, several potential wells were found on the ground and the electronic excited states potentials with potential barriers with respect to dissociation, where this dication can exist in the gas phase as long-lived metastable molecules. We confirm hence the recent observation of the dication by mass spectrometry. Moreover, we predict the existence of the metastable IO{sup 3+} trication, where a shallow potential well along the IO internuclear distance is computed. This potential well supports more than 10 vibrational levels. The IO{sup 3+} excited states are repulsive in nature, as well as the computed potentials for the IO{sup 4+} tetracation. For the bound states, we give a set of spectroscopic parameters including excitation transition energies, equilibrium distances, harmonic and anharmonic vibrational terms, and rotational constants. At the MRCI + Q/aug-cc-pV5Z(-PP) level, the adiabatic double and triple ionization energies of IO are computed to be ∼28.1 eV and ∼55.0 eV, respectively.

  2. U-121: Apple iOS Bugs Let Remote Users Execute Arbitrary Code...

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

    ID: 1026774 Apple Security Updates About the security content of iOS 5.1 Software Update CVE-2012-0641, CVE-2012-0642, CVE-2012-0643, CVE-2011-3453, CVE-2012-0644, CVE-2012-0585,...

  3. ARM - Datastreams - goes7ir8

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

    ir8 Documentation XDC documentation Data Quality Plots ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Datastream : GOES7IR8 GOES-7: infrared, channel 8

  4. U-165: Apple iOS Bugs Let Remote Users Execute Arbitrary Code and Spoof Address Bar URLs

    Broader source: Energy.gov [DOE]

    Two vulnerabilities were reported in Apple iOS. A remote user can cause arbitrary code to be executed on the target user's system. A remote user can spoof the address bar URL.

  5. Efficient data restructuring and aggregation for I/O acceleration in PIDX |

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

    Argonne Leadership Computing Facility Efficient data restructuring and aggregation for I/O acceleration in PIDX Authors: S. Kumar, V. Vishwanath, P. Carns, J. A. Levine, R. Latham, G. Scorzelli, H. Kolla, R. Grout, J. Chen, R. Ross, M. E. Papka, V. Pascucci Hierarchical, multiresolution data representations enable interactive analysis and visualization of large-scale simulations. One promising application of these techniques is to store high performance computing simulation output in a

  6. Investigation and design of a network, I/O and storage SDC susceptibility analzer

    SciTech Connect (OSTI)

    Dubois, Andrew; Dubois, David; Michalak, Sarah

    2011-01-19

    This slide deck is intended for the Durmstrang Team Quarterly Review to be held January 25, 2011 in Baltimore, MD. The slides provide an overview of the Investigation and Design of a Network, I/O and Storage SDC Susceptibility Analyzer project. In addition, the slides provide the goals of the project, details of the work done to date and the project status and future work.

  7. Mortar.io - Open BAS Platform Electrical and Computer Engineering Department

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

    Mortar.io - Open BAS Platform Electrical and Computer Engineering Department 1 Carnegie Mellon University Civil and Environmental Engineering Department 2 Carnegie Mellon University Anthony Rowe 1 , Mario Bérges 2 , Christopher Martin 3 Max Buevich 1 , Jingkun Gao 2 , Suman Giri 2 , Emre Kara 2 , Patrick Lazik 1 , Chris Palmer 1 , Niranjini Rajagopal 1 , Oliver Shih 1 Bosch Research and Technology Center 3 Sensor Andrew What's in a name? 3 Andrew Carnegie Andrew Mellon + Andrew File System

  8. Preemptible I/O Scheduling of Garbage Collection for Solid State Drives

    SciTech Connect (OSTI)

    Lee, Junghee; Kim, Youngjae; Shipman, Galen M; Oral, H Sarp; Kim, Jongman

    2012-01-01

    Abstract Unlike hard disks, flash devices use out-of-update operations and they require a garbage collection (GC) process to reclaim invalid pages to create free blocks. This GC process is a major cause of performance degradation when running concurrently with other I/O operations as internal bandwidth is consumed to reclaim these invalid pages. The invocation of the GC process is generally governed by a low watermark on free blocks and other internal device metrics that different workloads meet at different intervals. This results in I/O performance that is highly dependent on workload characteristics. In this paper, we examine the GC process and propose a semi-preemptible GC scheme that allows GC processing to be preempted while pending I/O requests in the queue are serviced. Moreover, we further enhance flash performance by pipelining internal GC operations and merge them with pending I/O requests whenever possible. Our experimental evaluation of this semipreemptible GC scheme with realistic workloads demonstrate both improved performance and reduced performance variability. Write-dominant workloads show up to a 66.56% improvement in average response time with a 83.30% reduced variance in response time compared to the non-preemptible GC scheme. In addition, we explore opportunities of a new NAND flash device that supports suspend/resume commands for read, write and erase operations for fully preemptible GC. Our experiments with a fully preemptible GC enabled flash device show that request response time can be improved by up to 14.57% compared to semi-preemptible GC.

  9. Minimizing I/O Costs of Multi-Dimensional Queries with BitmapIndices

    SciTech Connect (OSTI)

    Rotem, Doron; Stockinger, Kurt; Wu, Kesheng

    2006-03-30

    Bitmap indices have been widely used in scientific applications and commercial systems for processing complex,multi-dimensional queries where traditional tree-based indices would not work efficiently. A common approach for reducing the size of a bitmap index for high cardinality attributes is to group ranges of values of an attribute into bins and then build a bitmap for each bin rather than a bitmap for each value of the attribute. Binning reduces storage costs,however, results of queries based on bins often require additional filtering for discarding it false positives, i.e., records in the result that do not satisfy the query constraints. This additional filtering,also known as ''candidate checking,'' requires access to the base data on disk and involves significant I/O costs. This paper studies strategies for minimizing the I/O costs for ''candidate checking'' for multi-dimensional queries. This is done by determining the number of bins allocated for each dimension and then placing bin boundaries in optimal locations. Our algorithms use knowledge of data distribution and query workload. We derive several analytical results concerning optimal bin allocation for a probabilistic query model. Our experimental evaluation with real life data shows an average I/O cost improvement of at least a factor of 10 for multi-dimensional queries on datasets from two different applications. Our experiments also indicate that the speedup increases with the number of query dimensions.

  10. A real-time heart rate analysis for a remote millimeter wave I-Q sensor.

    SciTech Connect (OSTI)

    Bakhtiari, S.; Liao, S.; Elmer, T.; Gopalsami, N.; Raptis, A. C.

    2011-06-01

    This paper analyzes heart rate (HR) information from physiological tracings collected with a remote millimeter wave (mmW) I-Q sensor for biometric monitoring applications. A parameter optimization method based on the nonlinear Levenberg-Marquardt algorithm is used. The mmW sensor works at 94 GHz and can detect the vital signs of a human subject from a few to tens of meters away. The reflected mmW signal is typically affected by respiration, body movement, background noise, and electronic system noise. Processing of the mmW radar signal is, thus, necessary to obtain the true HR. The down-converted received signal in this case consists of both the real part (I-branch) and the imaginary part (Q-branch), which can be considered as the cosine and sine of the received phase of the HR signal. Instead of fitting the converted phase angle signal, the method directly fits the real and imaginary parts of the HR signal, which circumvents the need for phase unwrapping. This is particularly useful when the SNR is low. Also, the method identifies both beat-to-beat HR and individual heartbeat magnitude, which is valuable for some medical diagnosis applications. The mean HR here is compared to that obtained using the discrete Fourier transform.

  11. Summary of the Optics, IR, Injection, Operations, Reliability...

    Office of Scientific and Technical Information (OSTI)

    Summary of the Optics, IR, Injection, Operations, Reliability and Instrumentation Working Group Citation Details In-Document Search Title: Summary of the Optics, IR, Injection, ...

  12. IR Spectral Bands and Performance | Open Energy Information

    Open Energy Info (EERE)

    2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for IR Spectral Bands and Performance Citation Chris Douglass. IR Spectral Bands...

  13. US-CERT Control System Center Input/Output (I/O) Conceputal Design

    SciTech Connect (OSTI)

    Not Available

    2005-02-01

    This document was prepared for the US-CERT Control Systems Center of the National Cyber Security Division (NCSD) of the Department of Homeland Security (DHS). DHS has been tasked under the Homeland Security Act of 2002 to coordinate the overall national effort to enhance the protection of the national critical infrastructure. Homeland Security Presidential Directive HSPD-7 directs the federal departments to identify and prioritize critical infrastructure and protect it from terrorist attack. The US-CERT National Strategy for Control Systems Security was prepared by the NCSD to address the control system security component addressed in the National Strategy to Secure Cyberspace and the National Strategy for the Physical Protection of Critical Infrastructures and Key Assets. The US-CERT National Strategy for Control Systems Security identified five high-level strategic goals for improving cyber security of control systems; the I/O upgrade described in this document supports these goals. The vulnerability assessment Test Bed, located in the Information Operations Research Center (IORC) facility at Idaho National Laboratory (INL), consists of a cyber test facility integrated with multiple test beds that simulate the nation's critical infrastructure. The fundamental mission of the Test Bed is to provide industry owner/operators, system vendors, and multi-agency partners of the INL National Security Division a platform for vulnerability assessments of control systems. The Input/Output (I/O) upgrade to the Test Bed (see Work Package 3.1 of the FY-05 Annual Work Plan) will provide for the expansion of assessment capabilities within the IORC facility. It will also provide capabilities to connect test beds within the Test Range and other Laboratory resources. This will allow real time I/O data input and communication channels for full replications of control systems (Process Control Systems [PCS], Supervisory Control and Data Acquisition Systems [SCADA], and components

  14. Hopper:Improving I/O performance to GSCRATCH and PROJECT

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

    GSCRATCH/PROJECT Performance Tuning on Hopper Hopper:Improving I/O performance to GSCRATCH and PROJECT What are GSCRATCH/PROJECT? GSCRATCH and PROJECT are two file systems at NERSC that one can access on most computational systems. They are both based on the IBM GPFS file system and have multiple racks of dedicated servers and disk arrays. How are GSCRATCH/PROJECT connected to Hopper? As shown in the figure below, GSCRATCH and PROJECT are each connected to several Private NSD Servers (PNSD; for

  15. IO2566

    Office of Legacy Management (LM)

    566 ;;I: :.f;l -5 iii i: i:2 JOSEPH OALIBER, EBQ., RKCEIVKR 513-519 WKBT 20th STREET NEW YORK, NKU YORK April 1, 1993 Former Sites Restoration Division Director U.S. Department of...

  16. Gated IR Images of Shocked Surfaces

    SciTech Connect (OSTI)

    S. S. Lutz; W. D. Turley; P. M. Rightley; L. E. Primas

    2001-06-01

    Gated infrared (IR) images have been taken of a series of shocked surface geometries in tin. Metal coupons machined with steps and flats were mounted directly to the high explosive. The explosive was point-initiated and 500-ns to 1-microsecond-wide gated images of the target were taken immediately following shock breakout using a Santa Barbara Focalplane InSb camera (SBF-134). Spatial distributions of surface radiance were extracted from the images of the shocked samples and found to be non-single-valued. Several geometries were modeled using CTH, a two-dimensional Eulerian hydrocode.

  17. Spin orientations of the spin-half Ir4+ ions in Sr3NiIrO6, Sr2IrO4 and Na2IrO3: Density functional, perturbation theory and Madelung potential analyses

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

    Gordon, Elijah E.; Xiang, Hongjun; Koehler, Jurgen; Whangbo, Myung -Hwan

    2016-03-01

    The spins of the low-spin Ir4+ (S = 1/2, d5) ions at the octahedral sites of the oxides Sr3NiIrO6, Sr2IrO4 and Na2IrO3 exhibit preferred orientations with respect to their IrO6 octahedra. We evaluated the magnetic anisotropies of these S = 1/2 ions on the basis of DFT calculations including spin-orbit coupling (SOC), and probed their origin by performing perturbation theory analyses with SOC as perturbation within the LS coupling scheme. The observed spin orientations of Sr3NiIrO6 and Sr2IrO4 are correctly predicted by DFT calculations, and are accounted for by the perturbation theory analysis. As for the spin orientation of Na2IrO3,more » both experimental studies and DFT calculations have not been unequivocal. Our analysis reveals that the Ir4+ spin orientation of Na2IrO3 should have nonzero components along the c- and a-axes directions. The spin orientations determined by DFT calculations are sensitive to the accuracy of the crystal structures employed, which is explained by perturbation theory analyses when interactions between adjacent Ir4+ ions are taken into consideration. There are indications implying that the 5d electrons of Na2IrO3 are less strongly localized compared with those of Sr3NiIrO6 and Sr2IrO4. This implication was confirmed by showing that the Madelung potentials of the Ir4+ ions are less negative in Na2IrO3 than in Sr3NiIrO6, Sr2IrO4. Most transition-metal S = 1/2 ions do have magnetic anisotropies because the SOC induces interactions among their crystal-field split d-states, and the associated mixing of the states modifies only the orbital parts of the states. This finding cannot be mimicked by a spin Hamiltonian because this model Hamiltonian lacks the orbital degree of freedom, thereby leading to the spin-half syndrome. As a result, the spin-orbital entanglement for the 5d spin-half ions Ir4+ is not as strong as has been assumed lately.« less

  18. A Lightweight, High-performance I/O Management Package for Data-intensive Computing

    SciTech Connect (OSTI)

    Wang, Jun

    2011-06-22

    Our group has been working with ANL collaborators on the topic ??bridging the gap between parallel file system and local file system? during the course of this project period. We visited Argonne National Lab -- Dr. Robert Ross??s group for one week in the past summer 2007. We looked over our current project progress and planned the activities for the incoming years 2008-09. The PI met Dr. Robert Ross several times such as HEC FSIO workshop 08, SC??08 and SC??10. We explored the opportunities to develop a production system by leveraging our current prototype to (SOGP+PVFS) a new PVFS version. We delivered SOGP+PVFS codes to ANL PVFS2 group in 2008.We also talked about exploring a potential project on developing new parallel programming models and runtime systems for data-intensive scalable computing (DISC). The methodology is to evolve MPI towards DISC by incorporating some functions of Google MapReduce parallel programming model. More recently, we are together exploring how to leverage existing works to perform (1) coordination/aggregation of local I/O operations prior to movement over the WAN, (2) efficient bulk data movement over the WAN, (3) latency hiding techniques for latency-intensive operations. Since 2009, we start applying Hadoop/MapReduce to some HEC applications with LANL scientists John Bent and Salman Habib. Another on-going work is to improve checkpoint performance at I/O forwarding Layer for the Road Runner super computer with James Nuetz and Gary Gridder at LANL. Two senior undergraduates from our research group did summer internships about high-performance file and storage system projects in LANL since 2008 for consecutive three years. Both of them are now pursuing Ph.D. degree in our group and will be 4th year in the PhD program in Fall 2011 and go to LANL to advance two above-mentioned works during this winter break. Since 2009, we have been collaborating with several computer scientists (Gary Grider, John bent, Parks Fields, James Nunez

  19. IY:ILrnr IR-rl?l'

    Office of Legacy Management (LM)

    IY:ILrnr IR-rl?l' w&m PadmmmTuJ tmml' aIs~#l!REm m-t, - 188kwxm BYI alahard 0. cr*rrror cy- r' , ' .~ -' - -' ^ , /' cs< 4. .c :' ; *. .h,- ' (z&&y .' ,/ ;f. .* &J >l a. L \' P" ,,,' ,.' I * :{' \ !' l t ..b c&~ tf ~ , r ,, r. ,* .;;;., k J ;, b $y$' Lrmprrw)rlt&tmxJ- a@. Frqrr at t&i8 raoLli:.y SC\ daummiI~Luualndr8rr~lfCUIf@@?~~oy-~ d )I t rq ,i .* 1 Virium~~bUrlJlOgarspvlr at ma rdutw. (500 p-4 3) i" 1 ) ,ip" 2. rt A8 - u %I* mm

  20. Summary of the Optics, IR, Injection, Operations, Reliability...

    Office of Scientific and Technical Information (OSTI)

    Technical Report: Summary of the Optics, IR, Injection, Operations, Reliability and Instrumentation Working Group Citation Details In-Document Search Title: Summary of the Optics, ...

  1. Ir-based alloys for ultra-high temperature applications

    DOE Patents [OSTI]

    Liu, Chain T.; George, Easo P.; Bloom, Everett E.

    2006-01-03

    An alloy composition includes, in atomic percent: about 1 to about 10% of at least one element selected from the group consisting of Zr and Hf, balance Ir.

  2. X-ray transient absorption and picosecond IR spectroscopy of...

    Office of Scientific and Technical Information (OSTI)

    X-ray transient absorption and picosecond IR spectroscopy of fulvalene(tetracarbonyl)diruthenium on photoexcitation Citation Details In-Document Search Title: X-ray transient ...

  3. NEAR-IR TWO PHOTON MICROSCOPY IMAGING OF SILICA NANOPARTICLES...

    Office of Scientific and Technical Information (OSTI)

    NANOPARTICLES FUNCTIONALIZED WITH ISOLATED SENSITIZED Yb(III) CENTERS Citation Details In-Document Search Title: NEAR-IR TWO PHOTON MICROSCOPY IMAGING OF SILICA NANOPARTICLES ...

  4. Graphene-silicon layered structures on single-crystalline Ir...

    Office of Scientific and Technical Information (OSTI)

    Accepted Manuscript: Graphene-silicon layered structures on single-crystalline Ir(111) thin films Prev Next Title: Graphene-silicon layered structures on single-crystalline...

  5. IR keeps coal miners safe and reduces downtime

    SciTech Connect (OSTI)

    Massey, L.G.

    2009-01-15

    Infrared (IR) cameras can inspect the direct current trolley system that powers mantrips and locomotives that transport men and supplies to an underground mine. If trolley insulators become shorted or electrically leaky they can heat the roof and cause a fire or cave-in. The article explains how IR inspection works and describes typical problems that can be identified by thermograms. 8 figs.

  6. Simultaneous multi-beam planar array IR (pair) spectroscopy

    DOE Patents [OSTI]

    Elmore, Douglas L.; Rabolt, John F.; Tsao, Mei-Wei

    2005-09-13

    An apparatus and method capable of providing spatially multiplexed IR spectral information simultaneously in real-time for multiple samples or multiple spatial areas of one sample using IR absorption phenomena requires no moving parts or Fourier Transform during operation, and self-compensates for background spectra and degradation of component performance over time. IR spectral information and chemical analysis of the samples is determined by using one or more IR sources, sampling accessories for positioning the samples, optically dispersive elements, a focal plane array (FPA) arranged to detect the dispersed light beams, and a processor and display to control the FPA, and display an IR spectrograph. Fiber-optic coupling can be used to allow remote sensing. Portability, reliability, and ruggedness is enhanced due to the no-moving part construction. Applications include determining time-resolved orientation and characteristics of materials, including polymer monolayers. Orthogonal polarizers may be used to determine certain material characteristics.

  7. NaIrO3A Pentavalent Post-perovskite

    SciTech Connect (OSTI)

    M Bremholm; S Dutton; P Stephens; R Cava

    2011-12-31

    Sodium iridium (V) oxide, NaIrO{sub 3}, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO{sub 3}, the much-studied structural analog of the high-pressure post-perovskite phase of MgSiO{sub 3}. Among the oxide post-perovskites, NaIrO{sub 3} is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO{sub 6} octahedra separated by layers of NaO{sub 8} bicapped trigonal prisms. NaIrO{sub 3} shows no magnetic ordering and resistivity measurements show non-metallic behavior. The crystal structure, electrical and magnetic properties are discussed and compared to known post-perovskites and pentavalent perovskite metal oxides.

  8. Tidal dissipation in a homogeneous spherical body. II. Three examples: Mercury, Io, and Kepler-10 b

    SciTech Connect (OSTI)

    Makarov, Valeri V.; Efroimsky, Michael E-mail: michael.efroimsky@usno.navy.mil

    2014-11-01

    In Efroimsky and Makarov (Paper I), we derived from the first principles a formula for the tidal heating rate in a homogeneous sphere, compared it with the previously used formulae, and noted the differences. Now we present case studies: Mercury, Kepler-10 b, and a triaxial Io. A sharp frequency dependence of k {sub 2}/Q near spin-orbit resonances yields a sharp dependence of k {sub 2}/Q (and, therefore, of tidal heating) upon the spin rate. Thereby physical libration plays a major role in tidal heating of synchronously rotating planets. The magnitude of libration in the spin rate being defined by the planet's triaxiality, the latter becomes a factor determining the dissipation rate. Other parameters equal, a strongly triaxial synchronized body generates more heat than a similar body of a more symmetrical shape. After an initially triaxial object melts and loses its triaxiality, dissipation becomes less intensive; the body can solidify, with the tidal bulge becoming a new figure with triaxiality lower than the original. We derive approximate expressions for the dissipation rate in a Maxwell planet with the Maxwell time longer than the inverse tidal frequency. The expressions derived pertain to the 1:1 and 3:2 resonances and a nonresonant case; so they are applicable to most close-in super-Earths detected. In these planets, the heating outside synchronism is weakly dependent on the eccentricity and obliquity, provided both these parameters's values are moderate. According to our calculation, Kepler-10 b could hardly survive the intensive tidal heating without being synchronized, circularized, and reshaped through a complete or partial melt-down.

  9. EXPLORING IO'S ATMOSPHERIC COMPOSITION WITH APEX: FIRST MEASUREMENT OF {sup 34}SO{sub 2} AND TENTATIVE DETECTION OF KCl

    SciTech Connect (OSTI)

    Moullet, A.; Lellouch, E.; Moreno, R.; Gurwell, M.; Black, J. H; Butler, B.

    2013-10-10

    The composition of Io's tenuous atmosphere is poorly constrained. Only the major species SO{sub 2} and a handful of minor species have been positively identified, but a variety of other molecular species should be present, based on thermochemical equilibrium models of volcanic gas chemistry and the composition of Io's environment. This paper focuses on the spectral search for expected yet undetected molecular species (KCl, SiO, S{sub 2}O) and isotopes ({sup 34}SO{sub 2}). We analyze a disk-averaged spectrum of a potentially line-rich spectral window around 345 GHz, obtained in 2010 at the APEX 12 m antenna. Using different models assuming either extended atmospheric distributions or a purely volcanically sustained atmosphere, we tentatively measure the KCl relative abundance with respect to SO{sub 2} and derive a range of 4 × 10{sup –4}-8 × 10{sup –3}. We do not detect SiO or S{sub 2}O and present new upper limits on their abundances. We also present the first measurement of the {sup 34}S/{sup 32}S isotopic ratio in gas phase on Io, which appears to be twice as high as the Earth and interstellar medium reference values. Strong lines of SO{sub 2} and SO are also analyzed to check for longitudinal variations of column density and relative abundance. Our models show that, based on their predicted relative abundance with respect to SO{sub 2} in volcanic plumes, both the tentative KCl detection and SiO upper limit are compatible with a purely volcanic origin for these species.

  10. New IRS Rules for Small and Medium Wind Turbines

    Broader source: Energy.gov [DOE]

    The Small Wind Certification Council (SWCC) will host a webinar on how certification is being used to meet the new Internal Revenue Service (IRS) requirements for small and medium wind turbines...

  11. DWEA Webinar: IRS Guidance for Small Wind Turbines

    Broader source: Energy.gov [DOE]

    The U.S. Internal Revenue Service (IRS) has issued Notice 2015-4 providing new performance and quality standards of small wind turbines – defined as having a nameplate capacity of up to 100 kW – in...

  12. IRS Announces New Tribal Economic Development Bond Allocation Guidance

    Broader source: Energy.gov [DOE]

    Treasury and the IRS published new guidance today allocating Tribal Economic Development Bonds (TEDBs) for Tribes that have projects that are in the final stages of going to the market to receive financing.

  13. ARM - Field Campaign - IR Cloud Camera Feasibility Study

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

    govCampaignsIR Cloud Camera Feasibility Study ARM Data Discovery Browse Data Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send...

  14. Wet Chemical Compositional and Near IR Spectra Data Sets for...

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

    Find More Like This Return to Search Wet Chemical Compositional and Near IR Spectra Data ... Wet chemical compositional data and NIR spectra exist for the following types of biomass ...

  15. The Use of Microscopes and Telescopes in IR Imaging (Conference...

    Office of Scientific and Technical Information (OSTI)

    working in a research environment, where applications can vary from week to week. ... In these cases, the thermographer must rely on an IR microscope for close-up work with a ...

  16. Energy Efficient Clothes Dryer with IR Heating and Electrostatic

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

    Precipitator | Department of Energy Clothes Dryer with IR Heating and Electrostatic Precipitator Energy Efficient Clothes Dryer with IR Heating and Electrostatic Precipitator This project seeks to demonstrate a ventless residential dryer with an energy factor greater than 4.04.<br /> Photo credit: GE Global Research This project seeks to demonstrate a ventless residential dryer with an energy factor greater than 4.04. Photo credit: GE Global Research Project team members left to right

  17. Liquid chromatography/Fourier transform IR spectrometry interface flow cell

    DOE Patents [OSTI]

    Johnson, C.C.; Taylor, L.T.

    1985-01-04

    A zero dead volume (ZDV) microbore high performance liquid chromatography (..mu.. HPLC)/Fourier transform infrared (FTIR) interface flow cell includes an IR transparent crystal having a small diameter bore therein through which a sample liquid is passed. The interface flow cell further includes a metal holder in combination with a pair of inner, compressible seals for directly coupling the thus configured spectrometric flow cell to the outlet of a ..mu.. HPLC column end fitting to minimize the transfer volume of the effluents exiting the ..mu.. HPLC column which exhibit excellent flow characteristics due to the essentially unencumbered, open-flow design. The IR beam passes transverse to the sample flow through the circular bore within the IR transparent crystal, which is preferably comprised of potassium bromide (KBr) or calcium fluoride (CaF/sub 2/), so as to minimize interference patterns and vignetting encountered in conventional parallel-plate IR cells. The long IR beam pathlength and lensing effect of the circular cross-section of the sample volume in combination with the refractive index differences between the solvent and the transparent crystal serve to focus the IR beam in enhancing sample detection sensitivity by an order of magnitude.

  18. Liquid chromatography/Fourier transform IR spectrometry interface flow cell

    DOE Patents [OSTI]

    Johnson, Charles C.; Taylor, Larry T.

    1986-01-01

    A zero dead volume (ZDV) microbore high performance liquid chromatography (.mu.HPLC)/Fourier transform infrared (FTIR) interface flow cell includes an IR transparent crystal having a small diameter bore therein through which a sample liquid is passed. The interface flow cell further includes a metal holder in combination with a pair of inner, compressible seals for directly coupling the thus configured spectrometric flow cell to the outlet of a .mu.HPLC column end fitting to minimize the transfer volume of the effluents exiting the .mu.HPLC column which exhibit excellent flow characteristics due to the essentially unencumbered, open-flow design. The IR beam passes transverse to the sample flow through the circular bore within the IR transparent crystal, which is preferably comprised of potassium bromide (KBr) or calcium fluoride (CaF.sub.2), so as to minimize interference patterns and vignetting encountered in conventional parallel-plate IR cells. The long IR beam pathlength and lensing effect of the circular cross-section of the sample volume in combination with the refractive index differences between the solvent and the transparent crystal serve to focus the IR beam in enhancing sample detection sensitivity by an order of magnitude.

  19. Superconducting and magnetic properties of Sr?Ir?Sn??

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

    Biswas, P. K.; Wang, Kefeng; Amato, A.; Khasanov, R.; Luetkens, H.; Petrovic, C.; Cook, R. M.; Lees, M. R.; Morenzoni, E.

    2014-10-10

    Magnetization and muon spin relaxation or rotation (SR) measurements have been performed to study the superconducting and magnetic properties of Sr?Ir?Sn??. From magnetization measurements the lower and upper critical fields of Sr?Ir?Sn?? are found to be 81(1) Oe and 14.4(2) kOe, respectively. Zero-field SR data show no sign of any magnetic ordering or weak magnetism in Sr?Ir?Sn??. Transverse-field SR measurements in the vortex state provided the temperature dependence of the magnetic penetration depth ?. The dependence of ?? with temperature is consistent with the existence of single s-wave energy gap in the superconducting state of Sr?Ir?Sn?? with a gap valuemoreof 0.82(2) meV at absolute zero temperature. The magnetic penetration depth at zero temperature ?(0) is 291(3) nm. The ratio ?(0)/kBTc = 2.1(1) indicates that Sr?Ir?Sn?? should be considered as a strong-coupling superconductor.less

  20. Low Dose IR Creates an Oncogenic Microenvironment by Inducing Premature

    SciTech Connect (OSTI)

    Yuan, Zhi-Min

    2013-04-28

    Introduction Much of the work addressing ionizing radiation-induced cellular response has been carried out mainly with the traditional cell culture technique involving only one cell type, how cellular response to IR is influenced by the tissue microenvironment remains elusive. By use of a three-dimensional (3D) co-culture system to model critical interactions of different cell types with their neighbors and with their environment, we recently showed that low-dose IR-induced extracellular signaling via the tissue environment affects profoundly cellular responses. This proposal aims at determining the response of mammary epithelial cells in a tissue-like setting.

  1. Sr2IrO4: Gateway to cuprate superconductivity?

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

    Mitchell, J. F.

    2015-06-05

    High temperature superconductivity in cuprates remains a defining challenge in condensed matter physics. Recently, a new set of related compounds based on Ir rather than Cu has been discovered that may be on the verge of superconductivity themselves or be able to shed new light on the underlying interactions responsible for superconductivity in the cuprates.

  2. Relative Infrared (IR) and Terahertz (THz) Signatures of Common Explosives

    SciTech Connect (OSTI)

    Sharpe, Steven W.; Johnson, Timothy J.; Sheen, David M.; Atkinson, David A.

    2006-11-13

    Pacific Northwest National Laboratory (PNNL) has recently recorded the infrared (IR) and far-infrared (sometimes called the terahertz, THz) spectral signatures of four common explosives, in the condensed phase. The signatures of RDX, PETN, TNT and Tetryl were recorded both in the infrared and the THz domains, using Fourier transform infrared (FTIR) spectroscopy. Samples consisted of thin films and were made by depositing and subsequent evaporation of an acetone-explosive mixture. The complete spectrum spanned the range from 4,000 to 8 cm-1 at 2.0 cm-1 spectral resolution. Preliminary results in the infrared agree with those of previous workers, while the THz signatures are one order of magnitude weaker than the strongest IR bands.

  3. IR OPTICS MEASUREMENT WITH LINEAR COUPLING'S ACTION-ANGLE PARAMETERIZATION.

    SciTech Connect (OSTI)

    LUO, Y.; BAI, M.; PILAT, R.; SATOGATA, T.; TRBOJEVIC, D.

    2005-05-16

    A parameterization of linear coupling in action-angle coordinates is convenient for analytical calculations and interpretation of turn-by-turn (TBT) beam position monitor (BPM) data. We demonstrate how to use this parameterization to extract the twiss and coupling parameters in interaction regions (IRs), using BPMs on each side of the long IR drift region. The example of TBT BPM analysis was acquired at the Relativistic Heavy Ion Collider (RHIC), using an AC dipole to excite a single eigenmode. Besides the full treatment, a fast estimate of beta*, the beta function at the interaction point (IP), is provided, along with the phase advance between these BPMs. We also calculate and measure the waist of the beta function and the local optics.

  4. First lasing of the IR upgrade FEL at Jefferson lab

    SciTech Connect (OSTI)

    Christopher Behre; Stephen Benson; George Biallas; James Boyce; Christopher Curtis; David Douglas; H. Dylla; L. Dillon-townes; Richard Evans; Albert Grippo; Joseph Gubeli; David Hardy; John Heckman; Carlos Hernandez-Garcia; Tommy Hiatt; Kevin Jordan; Nikolitsa Merminga; George Neil; Joseph Preble; Harvey Rutt; Michelle D. Shinn; Timothy Siggins; Hiroyuki Toyokawa; David W. Waldman; Richard Walker; Neil Wilson; Byung Yunn; Shukui Zhang

    2004-08-01

    We report initial lasing results from the IR Upgrade FEL at Jefferson Lab[1]. The electron accelerator was operated with low average current beam at 80 MeV. The time structure of the beam was 120 pC bunches at 4.678 MHz with up to 750 {micro}sec pulses at 2Hz. Lasing was established over the entire wavelength range of the mirrors (5.5-6.6 {micro}m). The detuning curve length, turn-on time, and power were in agreement with modeling results assuming a 1 psec FWHM micropulse. The same model predicts over 10 kW of power output with 10 mA of beam and 10% output coupling, which is the ultimate design goal of the IR Upgrade FEL. The behavior of the laser while the dispersion section strength was varied was found to qualitatively match predictions. Initial CW lasing results also will be presented.

  5. The IR-resummed Effective Field Theory of Large Scale Structures...

    Office of Scientific and Technical Information (OSTI)

    IR-resummed Effective Field Theory of Large Scale Structures Citation Details In-Document Search Title: The IR-resummed Effective Field Theory of Large Scale Structures We present a ...

  6. Sub-picosecond IR study of the reactive intermediate in an alkane...

    Office of Scientific and Technical Information (OSTI)

    Sub-picosecond IR study of the reactive intermediate in an alkane C-H bond activation reaction by CpRh(CO)2 Citation Details In-Document Search Title: Sub-picosecond IR study of ...

  7. SESAM FT-IR: A Comparison of the R&D Workhorse to Standard Emission...

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

    SESAM FT-IR: A Comparison of the R&D Workhorse to Standard Emission Benches SESAM FT-IR: A Comparison of the R&D Workhorse to Standard Emission Benches Data for a number of ...

  8. 5 Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine...

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

    Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine Cycles: Comparison to Reference Methods 5 Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine Cycles: ...

  9. Uncooled thin film pyroelectric IR detector with aerogel thermal isolation

    SciTech Connect (OSTI)

    Ruffner, J.A.; Clem, P.G.; Tuttle, B.A. [and others

    1998-01-01

    Uncooled pyroelectric IR imaging systems, such as night vision goggles, offer important strategic advantages in battlefield scenarios and reconnaissance surveys. Until now, the current technology for fabricating these devices has been limited by low throughput and high cost which ultimately limit the availability of these sensor devices. We have developed and fabricated an alternative design for pyroelectric IR imaging sensors that utilizes a multilayered thin film deposition scheme to create a monolithic thin film imaging element on an active silicon substrate for the first time. This approach combines a thin film pyroelectric imaging element with a thermally insulating SiO{sub 2} aerogel thin film to produce a new type of uncooled IR sensor that offers significantly higher thermal, spatial, and temporal resolutions at a substantially lower cost per unit. This report describes the deposition, characterization and optimization of the aerogel thermal isolation layer and an appropriate pyroelectric imaging element. It also describes the overall integration of these components along with the appropriate planarization, etch stop, adhesion, electrode, and blacking agent thin film layers into a monolithic structure. 19 refs., 8 figs., 6 tabs.

  10. Carbon-Supported IrNi Core-Shell Nanoparticles: Synthesis Characterization and Catalytic Activity

    SciTech Connect (OSTI)

    K Sasaki; K Kuttiyiel; L Barrio; D Su; A Frenkel; N Marinkovic; D Mahajan; R Adzic

    2011-12-31

    We synthesized carbon-supported IrNi core-shell nanoparticles by chemical reduction and subsequent thermal annealing in H{sub 2}, and verified the formation of Ir shells on IrNi solid solution alloy cores by various experimental methods. The EXAFS analysis is consistent with the model wherein the IrNi nanoparticles are composed of two-layer Ir shells and IrNi alloy cores. In situ XAS revealed that the Ir shells completely protect Ni atoms in the cores from oxidation or dissolution in an acid electrolyte under elevated potentials. The formation of Ir shell during annealing due to thermal segregation is monitored by time-resolved synchrotron XRD measurements, coupled with Rietveld refinement analyses. The H{sub 2} oxidation activity of the IrNi nanoparticles was found to be higher than that of a commercial Pt/C catalyst. This is predominantly due to Ni-core-induced Ir shell contraction that makes the surface less reactive for IrOH formation, and the resulting more metallic Ir surface becomes more active for H{sub 2} oxidation. This new class of core-shell nanoparticles appears promising for application as hydrogen anode fuel cell electrocatalysts.

  11. IR Spectrometer Using 90-degree Off-axis Parabolic Mirrors

    SciTech Connect (OSTI)

    Robert M. Malone, Richard, G. Hacking, Ian J. McKenna, and Daniel H. Dolan

    2008-09-02

    A gated spectrometer has been designed for real-time, pulsed infrared (IR) studies at the National Synchrotron Light ource at the Brookhaven National Laboratory. A pair of 90-degree, off-axis parabolic mirrors are used to relay the light from an entrance slit to an output IR recording camera. With an initial wavelength range of 15004500 nm required, gratings could not be used in the spectrometer because grating orders would overlap. A magnesium oxide prism, placed between these parabolic mirrors, serves as the dispersion element. The spectrometer is doubly telecentric. With proper choice of the air spacing between the prism and the second parabolic mirror, any spectral region of interest within the InSb camera arrays sensitivity region can be recorded. The wavelengths leaving the second parabolic mirror are collimated, thereby relaxing the camera positioning tolerance. To set up the instrument, two different wavelength (visible) lasers are introduced at the entrance slit and made collinear with the optical axis via flip mirrors. After dispersion by the prism, these two laser beams are directed to tick marks located on the outside housing of the gated IR camera. This provides first-order wavelength calibration for the instrument. Light that is reflected off the front prism face is coupled into a high-speed detector to verify steady radiance during the gated spectral imaging. Alignment features include tick marks on the prism and parabolic mirrors. This instrument was designed to complement singlepoint pyrometry, which provides continuous time histories of a small collection of spots from shock-heated targets.

  12. MULTI-TUBE POWER LEADS TOWER FOR BEPCII IR MAGNETS.

    SciTech Connect (OSTI)

    JIA,L.X.; ZHANG,X.B.; WANG,L.; WANG,T.H.; YAO,Z.L.

    2004-05-11

    A power lead tower containing the multi-tube power leads is designed and under fabrication for the superconducting IR quadrupole magnets in the Beijing Electron Position Collider Upgrade (BEPCII). The lead tower consists of six pairs of gas-cooled leads for seven superconducting coils at various operating currents. The power lead is designed in a modular fashion, which can be easily applied to suit different operating current. The end copper block of the tube lead has a large cold mass that provide a large time constant in case of cooling flow interruption. A novel cryogenic electrical isolator is used for the leads.

  13. Large exchange bias enhancement in (Pt(or Pd)/Co)/IrMn/Co trilayers with ultrathin IrMn thanks to interfacial Cu dusting

    SciTech Connect (OSTI)

    Vinai, G. [SPINTEC, UMR 8191 CEA/CNRS/UJF/Grenoble-INP, CEA/INAC, 17, rue des Martyrs, 38054 Grenoble (France); Crocus Technology, 4 Place Robert Schuman, 38054 Grenoble (France); Moritz, J. [Institut Jean Lamour, UMR 7198 CNRS - Universit de Lorraine, Bd des Aiguillettes, BP 70239, F-54506 Vandoeuvre-les-Nancy Cedex (France); Bandiera, S. [Crocus Technology, 4 Place Robert Schuman, 38054 Grenoble (France); Prejbeanu, I. L.; Dieny, B. [SPINTEC, UMR 8191 CEA/CNRS/UJF/Grenoble-INP, CEA/INAC, 17, rue des Martyrs, 38054 Grenoble (France)

    2014-04-21

    The magnitude of exchange bias (H{sub ex}) at room temperature can be significantly enhanced in IrMn/Co and (Pt(or Pd)/Co)/IrMn/Co structures thanks to the insertion of an ultrathin Cu dusting layer at the IrMn/Co interface. The combination of trilayer structure and interfacial Cu dusting leads to a three-fold increase in H{sub ex} as compared to the conventional IrMn/Co bilayer structure, with an increased blocking temperature (T{sub B}) and a concave curvature of the temperature dependence H{sub ex}(T), ideal for improved Thermally Assisted-Magnetic Random Access Memory storage layer. This exchange bias enhancement is ascribed to a reduction of the spin frustration at the IrMn/Co interface thanks to interfacial Cu addition.

  14. Qualification tests for {sup 192}Ir sealed sources

    SciTech Connect (OSTI)

    Iancso, Georgeta Iliescu, Elena Iancu, Rodica

    2013-12-16

    This paper describes the results of qualification tests for {sup 192}Ir sealed sources, available in Testing and Nuclear Expertise Laboratory of National Institute for Physics and Nuclear Engineering 'Horia Hulubei' (I.F.I.N.-HH), Romania. These sources had to be produced in I.F.I.N.-HH and were tested in order to obtain the authorization from The National Commission for Nuclear Activities Control (CNCAN). The sources are used for gammagraphy procedures or in gammadefectoscopy equipments. Tests, measurement methods and equipments used, comply with CNCAN, AIEA and International Quality Standards and regulations. The qualification tests are: 1. Radiological tests and measurements: dose equivalent rate at 1 m; tightness; dose equivalent rate at the surface of the transport and storage container; external unfixed contamination of the container surface. 2. Mechanical and climatic tests: thermal shock; external pressure; mechanic shock; vibrations; boring; thermal conditions for storage and transportation. Passing all tests, it was obtained the Radiological Security Authorization for producing the {sup 192}Ir sealed sources. Now IFIN-HH can meet many demands for this sealed sources, as the only manufacturer in Romania.

  15. Infrared (IR) photon-sensitive spectromicroscopy in a cryogenic environment

    DOE Patents [OSTI]

    Pereverzev, Sergey

    2016-06-14

    A system designed to suppress thermal radiation background and to allow IR single-photon sensitive spectromicroscopy of small samples by using both absorption, reflection, and emission/luminescence measurements. The system in one embodiment includes: a light source; a plurality of cold mirrors configured to direct light along a beam path; a cold or warm sample holder in the beam path; windows of sample holder (or whole sample holder) are transparent in a spectral region of interest, so they do not emit thermal radiation in the same spectral region of interest; a cold monochromator or other cold spectral device configured to direct a selected fraction of light onto a cold detector; a system of cold apertures and shields positioned along the beam path to prevent unwanted thermal radiation from arriving at the cold monochromator and/or the detector; a plurality of optical, IR and microwave filters positioned along the beam path and configured to adjust a spectral composition of light incident upon the sample under investigation and/or on the detector; a refrigerator configured to maintain the detector at a temperature below 1.0K; and an enclosure configured to: thermally insulate the light source, the plurality of mirrors, the sample holder, the cold monochromator and the refrigerator.

  16. Epitaxial growth of iridate pyrochlore Nd2Ir2O7 films

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

    Gallagher, J. C.; Esser, B. D.; Morrow, R.; Dunsiger, S. R.; Williams, R. E. A.; Woodward, P. M.; McComb, D. W.; Yang, F. Y.

    2016-02-29

    Epitaxial films of the pyrochlore Nd2Ir2O7 have been grown on (111)-oriented yttria-stabilized zirconia (YSZ) substrates by off-axis sputtering followed by post-growth annealing. X-ray diffraction (XRD) results demonstrate phase-pure epitaxial growth of the pyrochlore films on YSZ. Scanning transmission electron microscopy (STEM) investigation of an Nd2Ir2O7 film with a short post-annealing provides insight into the mechanism for crystallization of Nd2Ir2O7 during the post-annealing process. STEM images reveal clear pyrochlore ordering of Nd and Ir in the films. As a result, the epitaxial relationship between the YSZ and Nd2Ir2O7 is observed clearly while some interfacial regions show a thin region with polycrystallinemore » Ir nanocrystals.« less

  17. FT-IR microscopical analysis with synchrotron radiation: The microscope optics and system performance

    SciTech Connect (OSTI)

    Reffner, J.A.; Martoglio, P.A.; Williams, G.P.

    1995-01-01

    When a Fourier transform infrared (FT-IR) microspectrometer was first interfaced with the National Synchrotron Light Source (NSLS) in September 1993, there was an instant realization that the performance at the diffraction limit had increased 40-100 times. The synchrotron source transformed the IR microspectrometer into a true IR microprobe, providing high-quality IR spectra for probe diameters at the diffraction limit. The combination of IR microspectroscopy and synchrotron radiation provides a powerful new tool for molecular spectroscopy. The ability to perform IR microspectroscopy with synchrotron radiation is still under development at Brookhaven National Laboratory, but several initial studies have been completed that demonstrate the broad-ranging applications of this technology and its potential for materials characterization.

  18. IO235U

    Office of Legacy Management (LM)

    The facility was used by the Atomic Energy Commission (AEC) for x-raying uranium metal ingots. At the Granite City Site, Uranium-238 above DOE guidelines is present in the x-ray ...

  19. I/O Libraries

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

    Help Staff Blogs Request Repository Mailing List Need Help? Out-of-hours Status and Password help Call operations: 1-800-66-NERSC, option 1 or 510-486-6821 Account Support ...

  20. I/O

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

    The New Computing Infrastructure In this issue Things you should know.........................1 Consultants' Corner...................2 Software and Tool News.........................4 Machine News.....................7 HPC-Behind the Scenes....................9 Quarterly Stats........16 Current Machines- a snapshot in time........17 LA-UR-15-26501 Things you should know... Standard service features: The Integrated Computing Network (ICN) Consulting Team provides user support on a wide variety

  1. I/O

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

    January-March, 2014 A quarterly newsletter for LANL's HPC user community In this issue Things you should know.......................1 Consultants Corner....................2 Software and Tool News......................3 Machines News.....................5 HPC-Behind the Scenes....................7 Quarterly Stats........8 HPC User Highlight .............................9 Current Machines- a snapshot in time.......11 LA-UR-14-21461 Things you should know............ Standard service features The

  2. I/O

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

    Trinity Issue In this issue Things you should know........................1 Consultants' Corner...................2 Software and Tool News.........................3 Machines News.....................5 HPC-Behind the Scenes.....................8 Quarterly Stats.......10 Current Machines- a snapshot in time.......11 LA-UR-14-27892 Things you should know............ Standard service features The Integrated Computing Network (ICN) Consulting Team provides user support on a wide variety of HPC

  3. I/O

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

    In this issue Things you should know........................1 Consultants Corner...................2 Software and Tool News.........................4 Machines News.....................6 HPC-Behind the Scenes.....................8 Quarterly Stats.......12 Current Machines- a snapshot in time.......13 LA-UR-14-25322 Things you should know............ Standard service features The Integrated Computing Network (ICN) Consulting Team provides user support on a wide variety of HPC topics: *

  4. A UV to mid-IR study of AGN selection

    SciTech Connect (OSTI)

    Chung, Sun Mi; Kochanek, Christopher S.; Assef, Roberto; Brown, Michael J. I.; Stern, Daniel; Jannuzi, Buell T.; Gonzalez, Anthony H.; Hickox, Ryan C.; Moustakas, John

    2014-07-20

    We classify the spectral energy distributions (SEDs) of 431,038 sources in the 9 deg{sup 2} Boötes field of the NOAO Deep Wide-Field Survey (NDWFS). There are up to 17 bands of data available per source, including ultraviolet (GALEX), optical (NDWFS), near-IR (NEWFIRM), and mid-infrared (IRAC and MIPS) data, as well as spectroscopic redshifts for ∼20,000 objects, primarily from the AGN and Galaxy Evolution Survey. We fit galaxy, active galactic nucleus (AGN), stellar, and brown dwarf templates to the observed SEDs, which yield spectral classes for the Galactic sources and photometric redshifts and galaxy/AGN luminosities for the extragalactic sources. The photometric redshift precision of the galaxy and AGN samples are σ/(1 + z) = 0.040 and σ/(1 + z) = 0.169, respectively, with the worst 5% outliers excluded. On the basis of the χ{sub ν}{sup 2} of the SED fit for each SED model, we are able to distinguish between Galactic and extragalactic sources for sources brighter than I = 23.5 mag. We compare the SED fits for a galaxy-only model and a galaxy-AGN model. Using known X-ray and spectroscopic AGN samples, we confirm that SED fitting can be successfully used as a method to identify large populations of AGNs, including spatially resolved AGNs with significant contributions from the host galaxy and objects with the emission line ratios of 'composite' spectra. We also use our results to compare with the X-ray, mid-IR, optical color, and emission line ratio selection techniques. For an F-ratio threshold of F > 10, we find 16,266 AGN candidates brighter than I = 23.5 mag and a surface density of ∼1900 AGN deg{sup –2}.

  5. Phthalocyanine adsorption to graphene on Ir(111): Evidence for decoupling from vibrational spectroscopy

    SciTech Connect (OSTI)

    Endlich, M. Gozdzik, S.; Néel, N.; Kröger, J.; Rosa, A. L. da; Frauenheim, T.; Wehling, T. O.

    2014-11-14

    Phthalocyanine molecules have been adsorbed to Ir(111) and to graphene on Ir(111). From a comparison of scanning tunneling microscopy images of individual molecules adsorbed to the different surfaces alone it is difficult to discern potential differences in the molecular adsorption geometry. In contrast, vibrational spectroscopy using inelastic electron scattering unequivocally hints at strong molecule deformations on Ir(111) and at a planar adsorption geometry on graphene. The spectroscopic evidence for the different adsorption configurations is supported by density functional calculations.

  6. IR Imaging Using Arrays of SiO2 Micromechanical Detectors (Journal...

    Office of Scientific and Technical Information (OSTI)

    Each detector element incorporates an optical resonant cavity layer in the IR absorbing region of the sensing element. The simplified microfabrication process requires only four ...

  7. On Loops in Inflation II: IR Effects in Single Clock Inflation...

    Office of Scientific and Technical Information (OSTI)

    Title: On Loops in Inflation II: IR Effects in Single Clock Inflation Authors: Senatore, Leonardo ; Stanford U., ITP KIPAC, Menlo Park ; Zaldarriaga, Matias ; Princeton, Inst. ...

  8. Structure and magnetic properties of the pyrochlore iridate Y2Ir2O7...

    Office of Scientific and Technical Information (OSTI)

    Structure and magnetic properties of the pyrochlore iridate Y2Ir2O7 Citation Details ... Sponsoring Org: USDOE Country of Publication: United States Language: English Word Cloud ...

  9. IRS Parking Facility Lighting Retrofit Reduces Annual Energy Use by 76%

    Broader source: Energy.gov [DOE]

    Document provides an overview of how the IRS and MC Realty Group, its property management firm, achieved a 76% reduction in lighting energy use at an IRS facility parking garage in Kansas City, Missouri. The retrofit resulted in annual energy savings of 2 million kWh, annual cost savings of over $122,000, and a simple payback of 2.5 years.

  10. NaIrO{sub 3}-A pentavalent post-perovskite

    SciTech Connect (OSTI)

    Bremholm, M.; Dutton, S.E.; Stephens, P.W.; Cava, R.J.

    2011-03-15

    Sodium iridium (V) oxide, NaIrO{sub 3,} was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO{sub 3}, the much-studied structural analog of the high-pressure post-perovskite phase of MgSiO{sub 3}. Among the oxide post-perovskites, NaIrO{sub 3} is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO{sub 6} octahedra separated by layers of NaO{sub 8} bicapped trigonal prisms. NaIrO{sub 3} shows no magnetic ordering and resistivity measurements show non-metallic behavior. The crystal structure, electrical and magnetic properties are discussed and compared to known post-perovskites and pentavalent perovskite metal oxides. -- Graphical abstract: Sodium iridium(V) oxide, NaIrO{sub 3}, synthesized by a high pressure solid state method and recovered to ambient conditions is found to crystallize as the post-perovskite structure and is the first example of a pentavalent ABO{sub 3} post-perovskite. Research highlights: {yields} NaIrO{sub 3} post-perovskite stabilized by pressure. {yields} First example of a pentavalent oxide post-perovskite. {yields} Non-metallic and non-magnetic behavior of NaIrO{sub 3}.

  11. Enhanced oxygen evolution activity of IrO2 and RuO2 (100) surfaces...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Enhanced oxygen evolution activity of IrO2 and RuO2 (100) surfaces Citation Details In-Document Search ... Here we report that the (100) surface of IrO2 and RuO2 is ...

  12. The development of in-situ calibration method for divertor IR thermography in ITER

    SciTech Connect (OSTI)

    Takeuchi, M.; Sugie, T.; Ogawa, H.; Takeyama, S.; Itami, K.

    2014-08-21

    For the development of the calibration method of the emissivity in IR light on the divertor plate in ITER divertor IR thermography system, the laboratory experiments have been performed by using IR instruments. The calibration of the IR camera was performed by the plane black body in the temperature of 100–600 degC. The radiances of the tungsten heated by 280 degC were measured by the IR camera without filter (2.5–5.1 μm) and with filter (2.95 μm, 4.67 μm). The preliminary data of the scattered light of the laser of 3.34 μm that injected into the tungsten were acquired.

  13. Measuring Broadband IR Irradiance in the Direct Solar Beam (Poster)

    SciTech Connect (OSTI)

    Reda, I.; Konings, J.; Xie, Y.; Dooraghi, M.; Sengupta, M.

    2015-03-01

    Solar and atmospheric science radiometers, e.g. pyranometers, pyrheliometers, and photovoltaic cells are calibrated with traceability to a consensus reference, which is maintained by Absolute Cavity Radiometers (ACRs). The ACR is an open cavity with no window, developed to measure extended broadband direct solar irradiance beyond the ultraviolet and infrared bands below and above 0.2 micrometers and 50 micrometers, respectively. On the other hand, pyranometers and pyrheliometers are developed to measure broadband shortwave irradiance from approximately 0.3 micrometers to 3 micrcometers, while the present photovoltaic cells are limited to approximately 0.3 micrometers to 1 micrometers. The broadband mismatch of ACR versus such radiometers causes discrepancy in radiometers' calibration methods that has not been discussed or addressed in the solar and atmospheric science literature. Pyrgeometers are also used for solar and atmospheric science applications and calibrated with traceability to consensus reference, yet calibrated during nighttime only, because no consensus reference has yet been established for the daytime longwave irradiance. This poster shows a method to measure the broadband IR irradiance in the direct solar beam from 3 micrometers to 50 micrometers, as first step that might be used to help develop calibration methods to address the mismatch between broadband ACR and shortwave radiometers, and the lack of a daytime reference for pyrgeometers. The irradiance was measured from sunrise to sunset for 5 days when the sun disk was cloudless; the irradiance varied from approximately 1 Wm-2 to 16 Wm-2 for solar zenith angle from 80 degres to 16 degrees respectively; estimated uncertainty is 1.5 Wm-2.

  14. Synchrotron IR microspectroscopy for protein structure analysis: Potential and questions

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

    Yu, Peiqiang

    2006-01-01

    Synchrotron radiation-based Fourier transform infrared microspectroscopy (S-FTIR) has been developed as a rapid, direct, non-destructive, bioanalytical technique. This technique takes advantage of synchrotron light brightness and small effective source size and is capable of exploring the molecular chemical make-up within microstructures of a biological tissue without destruction of inherent structures at ultra-spatial resolutions within cellular dimension. To date there has been very little application of this advanced technique to the study of pure protein inherent structure at a cellular level in biological tissues. In this review, a novel approach was introduced to show the potential of the newly developed, advancedmore » synchrotron-based analytical technology, which can be used to localize relatively “pure“ protein in the plant tissues and relatively reveal protein inherent structure and protein molecular chemical make-up within intact tissue at cellular and subcellular levels. Several complex protein IR spectra data analytical techniques (Gaussian and Lorentzian multi-component peak modeling, univariate and multivariate analysis, principal component analysis (PCA), and hierarchical cluster analysis (CLA) are employed to relatively reveal features of protein inherent structure and distinguish protein inherent structure differences between varieties/species and treatments in plant tissues. By using a multi-peak modeling procedure, RELATIVE estimates (but not EXACT determinations) for protein secondary structure analysis can be made for comparison purpose. The issues of pro- and anti-multi-peaking modeling/fitting procedure for relative estimation of protein structure were discussed. By using the PCA and CLA analyses, the plant molecular structure can be qualitatively separate one group from another, statistically, even though the spectral assignments are not known. The synchrotron-based technology provides a new approach for protein structure research in

  15. Measuring Broadband IR Irradiance in the Direct Solar Beam (Presentation)

    SciTech Connect (OSTI)

    Reda, I.

    2015-03-01

    Solar and atmospheric science radiometers, e.g. pyranometers, pyrheliometers, and photovoltaic cells are calibrated with traceability to a consensus reference, which is maintained by Absolute Cavity Radiometers (ACRs). The ACR is an open cavity with no window, developed to measure extended broadband direct solar irradiance beyond the ultraviolet and infrared bands below and above 0.2 um and 50 um, respectively. On the other hand, pyranometers and pyrheliometers are developed to measure broadband shortwave irradiance from approximately 0.3 um to 3 um, while the present photovoltaic cells are limited to approximately 0.3 um to 1 um. The broadband mismatch of ACR versus such radiometers causes discrepancy in radiometers' calibration methods that has not been discussed or addressed in the solar and atmospheric science literature. Pyrgeometers are also used for solar and atmospheric science applications and are calibrated with traceability to consensus reference, yet are calibrated during nighttime only, because no consensus reference has yet been established for the daytime longwave irradiance. This poster shows a method to measure the broadband IR irradiance in the direct solar beam from 3 um to 50 um, as a first step that might be used to help develop calibration methods to address the mismatch between broadband ACR and shortwave radiometers, and the lack of a daytime reference for pyrgeometers. The irradiance was measured from sunrise to sunset for 5 days when the sun disk was cloudless; the irradiance varied from approximately 1 Wm-2 to 16 Wm-2 for solar zenith angle from 80 degrees to 16 degrees respectively; estimated uncertainty is 1.5 Wm-2.

  16. NGC 7538 IRS 1 - Subarcsecond resolution recombination line and (N-15)H3 maser observations

    SciTech Connect (OSTI)

    Gaume, R.A.; Johnston, K.J.; Nguyen, H.A.; Wilson, T.L.; Dickel, H.R. Max-Planck-Inst. fuer Radioastronomie, Bonn Illinois Univ., Urbana )

    1991-08-01

    The present imaging of the NGC 7538 IRS 1-associated (N-15)H3 (J, K) = (3, 3) maser emission with 0.2-arcsec resolution shows the strongest such masers, which may be amplifying the strong double-lobe radio continuum core of the IRS 1 H II region, to be concentrated in two regions separated by about 0.2 arcsec. Observations of several hydrogen recombination line transitions indicate that the velocity of the IRS H II region is similar to that of the ambient molecular cloud. 23 refs.

  17. New insulating antiferromagnetic quaternary iridates MLa10Ir4O24...

    Office of Scientific and Technical Information (OSTI)

    The canonical example is the Ruddlesden-Popper compound Sr2IrO4, which has been suggested as a potential route to a new class of high temperature superconductor due to the formal ...

  18. Structure symmetry determination and magnetic evolution in Sr2Ir1...

    Office of Scientific and Technical Information (OSTI)

    evolution in Sr2Ir1-xRhxO4 This content will become publicly available on November 23, 2016 Prev Next Title: Structure symmetry determination and magnetic evolution in ...

  19. IR Imaging Using Arrays of SiO2 Micromechanical Detectors

    SciTech Connect (OSTI)

    Grbovic, Dragoslav; Lavrik, Nickolay V; Rajic, Slobodan; Datskos, Panos G; Hunter, Scott Robert

    2012-01-01

    In this letter, we describe the fabrication of an array of bimaterial detectors for infrared (IR) imaging that utilize SiO2 as a structural material. All the substrate material underneath the active area of each detector element was removed. Each detector element incorporates an optical resonant cavity layer in the IR absorbing region of the sensing element. The simplified microfabrication process requires only four photolithographic steps with no wet etching or sacrificial layers. The thermomechanical deflection sensitivity was 7.9 10-3 rad/K which corresponds to a noise equivalent temperature difference (NETD) of 2.9 mK. In the present work the array was used to capture IR images while operating at room temperature and atmospheric pressure and no need for vacuum packaging. The average measured NETD of our IR detector system was approximately 200 mK but some sensing elements exhibited an NETD of 50 mK.

  20. 5 Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine Cycles:

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

    Comparison to Reference Methods | Department of Energy Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine Cycles: Comparison to Reference Methods 5 Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine Cycles: Comparison to Reference Methods 2005 Diesel Engine Emissions Reduction (DEER) Conference Presentations and Posters 2005_deer_lake.pdf (837.29 KB) More Documents & Publications Reductant Utilization in a LNT + SCR System Spatiotemporal Distribution of NOx

  1. LENS MODELS OF HERSCHEL-SELECTED GALAXIES FROM HIGH-RESOLUTION NEAR-IR OBSERVATIONS

    SciTech Connect (OSTI)

    Calanog, J. A.; Cooray, A.; Ma, B.; Casey, C. M.; Fu, Hai; Wardlow, J.; Amber, S.; Baker, A. J.; Baes, M.; Bock, J.; Bourne, N.; Dye, S.; Bussmann, R. S.; Chapman, S. C.; Clements, D. L.; Conley, A.; Dannerbauer, H.; Dunne, L.; Eales, S.; and others

    2014-12-20

    We present Keck-Adaptive Optics and Hubble Space Telescope high resolution near-infrared (IR) imaging for 500 ?m bright candidate lensing systems identified by the Herschel Multi-tiered Extragalactic Survey and Herschel Astrophysical Terahertz Large Area Survey. Out of 87 candidates with near-IR imaging, 15 (?17%) display clear near-IR lensing morphologies. We present near-IR lens models to reconstruct and recover basic rest-frame optical morphological properties of the background galaxies from 12 new systems. Sources with the largest near-IR magnification factors also tend to be the most compact, consistent with the size bias predicted from simulations and previous lensing models for submillimeter galaxies (SMGs). For four new sources that also have high-resolution submillimeter maps, we test for differential lensing between the stellar and dust components and find that the 880 ?m magnification factor (?{sub 880}) is ?1.5 times higher than the near-IR magnification factor (?{sub NIR}), on average. We also find that the stellar emission is ?2 times more extended in size than dust. The rest-frame optical properties of our sample of Herschel-selected lensed SMGs are consistent with those of unlensed SMGs, which suggests that the two populations are similar.

  2. New insulating antiferromagnetic quaternary iridates MLa10Ir4O24 (M=Sr, Ba)

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

    Zhao, Qingbiao; Han, Fei; Stoumpos, Constantinos C.; Han, Tian -Heng; Li, Hao; Mitchell, J. F.

    2015-07-01

    Recently, oxides of Ir4+ have received renewed attention in the condensed matter physics community, as it has been reported that certain iridates have a strongly spin-orbital coupled (SOC) electronic state, Jeff = ½, that defines the electronic and magnetic properties. The canonical example is the Ruddlesden-Popper compound Sr2IrO4, which has been suggested as a potential route to a new class of high temperature superconductor due to the formal analogy between Jeff = ½ and the S = ½ state of the cuprate superconductors. The quest for other iridium oxides that present tests of the underlying SOC physics is underway. Inmore » this spirit, here we report the synthesis and physical properties of two new quaternary tetravalent iridates, MLa10Ir4O24 (M = Sr, Ba). The crystal structure of both compounds features isolated IrO6 octahedra in which the electronic configuration of Ir is d5. As a result, both compounds order antiferromagnetically despite the lack of obvious superexchange pathways, and resistivity measurement shows that SrLa10Ir4O24 is an insulator.« less

  3. Planar Hall effect in Y{sub 3}Fe{sub 5}O{sub 12}/IrMn films

    SciTech Connect (OSTI)

    Zhang, X. Zou, L. K.

    2014-12-29

    The planar Hall effect of IrMn on an yttrium iron garnet (YIG = Y{sub 3}Fe{sub 5}O{sub 12}) was measured in the magnetic field rotating in the film plane. The magnetic field angular dependence of planar Hall resistance (PHR) was observed in YIG/IrMn bilayer at different temperatures, while the Gd{sub 3}Ga{sub 5}O{sub 12}/IrMn film shows constant PHR for different magnetic field angles at both 10 K and 300 K. This provides evidence that IrMn has interfacial spins which can be led by ferrimagnetic layer in YIG/IrMn structure. A hysteresis can be observed in PHR-magnetic field angle loop of YIG/IrMn film at 10 K, indicative of the irreversible switching of IrMn interfacial spins at low temperature.

  4. Elastic, magnetic and electronic properties of iridium phosphide Ir2P

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

    Wang, Pei; Wang, Yonggang; Wang, Liping; Zhang, Xinyu; Yu, Xiaohui; Zhu, Jinlong; Wang, Shanmin; Qin, Jiaqian; Leinenweber, Kurt; Chen, Haihua; et al

    2016-02-24

    Cubic (space group: Fm3¯m) iridium phosphide, Ir2P, has been synthesized at high pressure and high temperature. Angle-dispersive synchrotron X-ray diffraction measurements on Ir2P powder using a diamond-anvil cell at room temperature and high pressures (up to 40.6 GPa) yielded a bulk modulus of B0 = 306(6) GPa and its pressure derivative B0' = 6.4(5). Such a high bulk modulus attributed to the short and strongly covalent Ir-P bonds as revealed by first – principles calculations and three-dimensionally distributed [IrP4] tetrahedron network. Indentation testing on a well–sintered polycrystalline sample yielded the hardness of 11.8(4) GPa. Relatively low shear modulus of ~64more » GPa from theoretical calculations suggests a complicated overall bonding in Ir2P with metallic, ionic, and covalent characteristics. Additionally, a spin glass behavior is indicated by magnetic susceptibility measurements.« less

  5. Elastic, magnetic and electronic properties of iridium phosphide Ir2P

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

    Wang, Pei; Wang, Yonggang; Wang, Liping; Zhang, Xinyu; Yu, Xiaohui; Zhu, Jinlong; Wang, Shanmin; Qin, Jiaqian; Leinenweber, Kurt; Chen, Haihua; et al

    2016-02-24

    Cubic (space group: Fm3¯m) iridium phosphide, Ir2P, has been synthesized at high pressure and high temperature. Angle-dispersive synchrotron X-ray diffraction measurements on Ir2P powder using a diamond-anvil cell at room temperature and high pressures (up to 40.6 GPa) yielded a bulk modulus of B0 = 306(6) GPa and its pressure derivative B0'= 6.4(5). Such a high bulk modulus attributed to the short and strongly covalent Ir-P bonds as revealed by first – principles calculations and three-dimensionally distributed [IrP4] tetrahedron network. Indentation testing on a well–sintered polycrystalline sample yielded the hardness of 11.8(4) GPa. Relatively low shear modulus of ~64 GPamore » from theoretical calculations suggests a complicated overall bonding in Ir2P with metallic, ionic, and covalent characteristics. Additionally, a spin glass behavior is indicated by magnetic susceptibility measurements.« less

  6. Copper intercalation at the interface of graphene and Ir(111) studied by scanning tunneling microscopy

    SciTech Connect (OSTI)

    Sicot, M. Fagot-Revurat, Y.; Kierren, B.; Vasseur, G.; Malterre, D.

    2014-11-10

    We report on the intercalation of a submonolayer of copper at 775?K underneath graphene epitaxially grown on Ir(111) studied by means of low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) at 77?K. Nucleation and growth dynamics of Cu below graphene have been investigated, and, most importantly, the intercalation mechanism has been identified. First, LEED patterns reveal the pseudomorphic growth of Cu on Ir under the topmost graphene layer resulting in a large Cu in-plane lattice parameter expansion of about 6% compared to Cu(111). Second, large-scale STM topographs as a function of Cu coverage show that Cu diffusion on Ir below graphene exhibits a low energy barrier resulting in Cu accumulation at Ir step edges. As a result, the graphene sheet undergoes a strong edges reshaping. Finally, atomically-resolved STM images reveal a damaged graphene sheet at the atomic scale after metal intercalation. Point defects in graphene were shown to be carbon vacancies. According to these results, a Cu penetration path beneath graphene is proposed to occur via metal aided defect formation with no or poor self healing of the graphene sheet. This work illustrates the fact that Cu intercalation is harmful for graphene grown on Ir(111) at the atomic scale.

  7. Vortexlike excitations in the heavy-fermion superconductor CeIrIn5

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

    Luo, Yongkang; Rosa, P. F. S.; Bauer, E. D.; Thompson, J. D.

    2016-05-05

    Here, we report a systematic study of temperature- and field-dependent charge (ρ) and entropy (S) transport in the heavy-fermion superconductor CeIrIn5. Its large positive thermopower Sxx is typical of Ce-based Kondo lattice systems, and strong electronic correlations play an important role in enhancing the Nernst signal Sxy. By separating the off-diagonal Peltier coefficient αxy from Sxy, we find that αxy becomes positive and greatly enhanced at temperatures well above the bulk Tc. Compared with the nonmagnetic analog LaIrIn5, these results suggest vortexlike excitations in a precursor state to unconventional superconductivity in CeIrIn5. This study sheds light on the similarity ofmore » heavy-fermion and cuprate superconductors and on the possibility of states not characterized by the amplitude of an order parameter.« less

  8. Modulated IR radiometry for determining thermal properties and basic characteristics of titanium thin films

    SciTech Connect (OSTI)

    Apreutesei, Mihai; Lopes, Claudia; Vaz, Filipe; Macedo, Francisco; Borges, Joel

    2014-07-01

    Titanium thin films of different thicknesses were prepared by direct current magnetron sputtering to study modulated infrared (IR) radiometry as a tool for analyzing film thickness. Thickness was varied by regularly increasing the deposition time, keeping all the other deposition parameters constant. The influence of film thickness on morphological, structural, and electrical properties of the titanium coatings also was investigated. The experimental results revealed a systematic grain growth with increasing film thickness, along with enhanced film crystallinity, which led to increased electrical conductivity. Using the results obtained by modulated IR radiometry, the thickness of each thin film was calculated. These thickness values were then compared with the coating thickness measurements obtained by scanning electron microscopy. The values confirmed the reliability of modulated IR radiometry as an analysis tool for thin films and coatings, and for determining thicknesses in the micrometer range, in particular.

  9. Determination of partial (n,xngamma) cross-sections in 193-Ir

    SciTech Connect (OSTI)

    Talou, P; Chadwick, M B; Nelson, R; Fotiades, N; Devlin, M; Garrett, P E; Younes, W; Becker, J A

    2003-10-15

    The {sup 193}Ir(n,n'){sup 193m}Ir cross section for the production of the 80-keV isomer in {sup 193}Ir is evaluated using a combination of experimental data and nuclear reaction modeling, from threshold to about 20 MeV. Four discrete {gamma} lines feeding the isomer were recently observed with the GEANIE {gamma}-ray detector at LANSCE. Theoretical calculations of the nuclear reaction mechanisms in play are then carried out to evaluate the contributions not accounted for in the experimental setup (direct population; fraction of {gamma}-lines not observed in the experiment; etc). Experiment and modeling are then combined to provide a total cross section for the production of the Iridium isomer. We finally compare our result with activation measurement data available for a few energy points.

  10. Structure symmetry determination and magnetic evolution in Sr2Ir1–xRhxO4

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

    Ye, Feng; Wang, Xiaoping; Hoffmann, Christina; Wang, Jinchen; Chi, Songxue; Matsuda, Masaaki; Chakoumakos, Bryan C.; Fernandez-Baca, Jaime A.; Cao, Gang

    2015-11-23

    We use single-crystal neutron diffraction to determine the crystal structure symmetry and to study the magnetic evolution in the rhodium doped iridates Sr2Ir1–xRhxO4 (0 ≤ x ≤ 0.16). Throughout this doping range, the crystal structure retains a tetragonal symmetry (space group I41/a) with two distinct magnetic Ir sites in the unit cell forming staggered IrO6 rotation. Upon Rh doping, the magnetic order is suppressed and the magnetic moment of Ir4+ is reduced from 0.21 μB/Ir for x = 0 to 0.18 μB/Ir for x = 0.12. As a result, the magnetic structure at x = 0.12 is different from thatmore » of the parent compound while the moments remain in the basal plane.« less

  11. Mechanism of Efficient Anti-Markovnikov Olefin Hydroarylation Catalyzed by Homogeneous Ir(III) Complexes

    SciTech Connect (OSTI)

    Bhalla, Gaurav; Bischof, Steven M; Ganesh, Somesh K; Liu, Xiang Y; Jones, C J; Borzenko, Andrey; Tenn, William J; Ess, Daniel H; Hashiguchi, Brian G; Lokare, Kapil S; Leung, Chin Hin; Oxgaard, Jonas; Goddard, William A; Periana, Roy A

    2011-01-01

    The mechanism of the hydroarylation reaction between unactivated olefins (ethylene, propylene, and styrene) and benzene catalyzed by [(R)Ir(?-acac-O,O,C{sup 3})-(acac-O,O){sub 2}]{sub 2} and [R-Ir(acac-O,O){sub 2}(L)] (R = acetylacetonato, CH{sub 3}, CH{sub 2}CH{sub 3}, Ph, or CH{sub 2}CH{sub 2}Ph, and L = H{sub 2}O or pyridine) Ir(III) complexes was studied by experimental methods. The system is selective for generating the anti-Markovnikov product of linear alkylarenes (61:39 for benzene + propylene and 98:2 for benzene + styrene). The reaction mechanism was found to follow a rate law with first-order dependence on benzene and catalyst, but a non-linear dependence on olefin. {sup 13}C-labelling studies with CH{sub 3}{sup 13}CH{sub 2}-Ir-Py showed that reversible ?-hydride elimination is facile, but unproductive, giving exclusively saturated alkylarene products. The migration of the {sup 13}C-label from the ? to ?-positions was found to be slower than the CH activation of benzene (and thus formation of ethane and Ph-d{sub 5}-Ir-Py). Kinetic analysis under steady state conditions gave a ratio of the rate constants for CH activation and ?-hydride elimination (k{sub CH}: k{sub ?}) of ~0.5. The comparable magnitude of these rates suggests a common rate determining transition state/intermediate, which has been shown previously with B3LYP density functional theory (DFT) calculations. Overall, the mechanism of hydroarylation proceeds through a series of pre-equilibrium dissociative steps involving rupture of the dinuclear species or the loss of L from Ph-Ir-L to the solvento, 16-electron species, Ph-Ir(acac-O,O){sub 2}-Sol (where Sol refers to coordinated solvent). This species then undergoes trans to cisisomerization of the acetylacetonato ligand to yield the pseudo octahedral species cis-Ph-Ir-Sol, which is followed by olefin insertion (the regioselective and rate determining step), and then activation of the CH bond of an incoming benzene to generate the product and

  12. Handling collision debris in quad- and dipole-first LHC IR options

    SciTech Connect (OSTI)

    Mokhov, N.V.; Rakhno, I.L.; /Fermilab

    2006-12-01

    Detailed MARS15 Monte Carlo energy deposition calculations are performed for two main designs of the LHC interaction regions (IR) capable to achieve a luminosity of 10{sup 35} cm{sup -2} s{sup -1}: a traditional quadrupole-first scheme and the one with a dual-bore inner triplet with separation dipoles placed in front of the quadrupoles. It is shown that with the appropriate design of the Nb3Sn magnets, IR layout and a number of protective measures implemented, both schemes are feasible for the LHC luminosity upgrade up to 10{sup 35} cm{sup -2} s{sup -1}.

  13. Filamentation of IR and UV femtosecond pulses upon focusing in air

    SciTech Connect (OSTI)

    Dergachev, A A; Ionin, Andrei A; Kandidov, V P; Seleznev, L V; Sinitsyn, D V; Sunchugasheva, E S; Shlenov, Svyatoslav A

    2013-01-31

    The filamentation of IR and UV laser pulses has been studied numerically and experimentally for different initial beam focusing geometries, and linear electron density profiles along the plasma channel of filaments have been obtained. The results demonstrate that changes in laser beam focusing have a stronger effect on filament and plasma channel parameters for UV radiation than for IR radiation. Focusing causes individual high fluence regions produced by refocusing to merge to form a continuous extended filament with a continuous plasma channel. (nonlinear optical phenomena)

  14. SESAM FT-IR: A Comparison of the R&D Workhorse to Standard Emission Benches

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

    | Department of Energy SESAM FT-IR: A Comparison of the R&D Workhorse to Standard Emission Benches SESAM FT-IR: A Comparison of the R&D Workhorse to Standard Emission Benches Data for a number of regulated emissions and ethanol using the SESAM FT-IR compare favorably with standard emissions analyzers. p-07_frazee.pdf (499.08 KB) More Documents & Publications 5 Hz Catalytic Emissions FT-IR Monitoring during Lean-Rich Engine Cycles: Comparison to Reference Methods Vehicle

  15. Nature of the insulating ground state of the 5d postperovskite CaIrO3

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

    Kim, Sun -Woo; Liu, Chen; Kim, Hyun -Jung; Lee, Jun -Ho; Yao, Yongxin; Ho, Kai -Ming; Cho, Jun -Hyung

    2015-08-26

    In this study, the insulating ground state of the 5d transition metal oxide CaIrO3 has been classified as a Mott-type insulator. Based on a systematic density functional theory (DFT) study with local, semilocal, and hybrid exchange-correlation functionals, we reveal that the Ir t2g states exhibit large splittings and one-dimensional electronic states along the c axis due to a tetragonal crystal field. Our hybrid DFT calculation adequately describes the antiferromagnetic (AFM) order along the c direction via a superexchange interaction between Ir4+ spins. Furthermore, the spin-orbit coupling (SOC) hybridizes the t2g states to open an insulating gap. These results indicate thatmore » CaIrO3 can be represented as a spin-orbit Slater insulator, driven by the interplay between a long-range AFM order and the SOC. Such a Slater mechanism for the gap formation is also demonstrated by the DFT + dynamical mean field theory calculation, where the metal-insulator transition and the paramagnetic to AFM phase transition are concomitant with each other.« less

  16. Nature of the insulating ground state of the5d postperovskite CaIrO?

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

    Kim, Sun -Woo; Liu, Chen; Kim, Hyun -Jung; Lee, Jun -Ho; Yao, Yongxin; Ho, Kai -Ming; Cho, Jun -Hyung

    2015-08-26

    In this study, the insulating ground state of the 5d transition metal oxide CaIrO3 has been classified as a Mott-type insulator. Based on a systematic density functional theory (DFT) study with local, semilocal, and hybrid exchange-correlation functionals, we reveal that the Ir t2g states exhibit large splittings and one-dimensional electronic states along the c axis due to a tetragonal crystal field. Our hybrid DFT calculation adequately describes the antiferromagnetic (AFM) order along the c direction via a superexchange interaction between Ir4+ spins. Furthermore, the spin-orbit coupling (SOC) hybridizes the t2g states to open an insulating gap. These results indicate thatmoreCaIrO3 can be represented as a spin-orbit Slater insulator, driven by the interplay between a long-range AFM order and the SOC. Such a Slater mechanism for the gap formation is also demonstrated by the DFT + dynamical mean field theory calculation, where the metal-insulator transition and the paramagnetic to AFM phase transition are concomitant with each other.less

  17. Overview and status of first 25 MW(e) IR-CFB boiler in India

    SciTech Connect (OSTI)

    Kavidass, S.; Bakshi, V.K.; Diwakar, K.K.

    1997-12-31

    The Babcock and Wilcox (B and W) internal recirculation CFB (IR-CFB) boiler is unique in design. Worldwide, B and W offers IR-CFB boilers up to 150 MW(e) both reheat and non-reheat, and is pursuing units up to 300 MW(e). This paper discusses an overview and status of the construction, commissioning, initial start-up operation and milestones of the ongoing 25 MW(e) IR-CFB boiler project at Kanoria Chemicals and Industries Ltd., Renukoot, India. This IR-CFB boiler is designed, supplied and installed by Thermax Babcock and Wilcox Ltd. (TBW), a joint venture company of the B and W and Thermax in India. The boiler parameters are, steam flow of 29.2 kg/s (23,420 lbs/hr), 6.4 MPa (925 psig), and 485 C (905 F) with feedwater temperature of 180 C (356 F). The boiler will utilize high-ash content (> 45%), subbituminous coal with a heating value of 3,500 KCal/kg (6,300 Btu/lb). This paper also discusses the various aspects of the boiler design, performance, auxiliary equipment, advantages and initial start-up operating performance.

  18. Update of operating experience of B and W IR-CFB coal-fired boilers

    SciTech Connect (OSTI)

    Belin, F.; Kavidass, S.; Maryamchik, M.; Walker, D.J.; Mandal, A.K.; Price, C.E.

    1999-07-01

    This paper updates the operating experience of two Babcock and Wilcox (B and W) coal-fired, internal recirculation circulating fluidized-bed (IR-CFB) boilers. The first boiler is located at Southern Illinois University (SIU) in Carbondale, Illinois, USA, and is designed for 35 MW{sub th} output for cogeneration application, utilizing high sulfur, low ash Illinois coal. The second boiler is located at Kanoria Chemicals and Industries in Renukoot, India, and is designed for 81 MW{sub th} output for captive power requirement, firing high ash, low sulfur coal. This boiler was supplied by Thermax B and W Ltd., a joint venture company of B and W and Thermax of India. The choice of CFB technology was based on its fuel flexibility, cost effectiveness and environmental benefits for solid fuels. Based on the broad experience in designing utility and industrial boilers for operation worldwide, B and W has developed a cost effective and compact atmospheric pressure IR-CFB boiler. The B and W IR-CFB boiler design is distinctive in its use of U-beam particle separators. Worldwide, B and W offers IF-CFB boilers up to 175 MW{sub th}, both reheat and non-reheat, and is pursuing units up to 350 MW{sub th}. This paper reviews the general description of each IR-CFB boiler, design and performance aspects, as well as overall operating experiences. The boiler availabilities including maintenance aspects and emissions data will be presented.

  19. Temperature dependence of anisotropic magnetoresistance in antiferromagnetic Sr{sub 2}IrO{sub 4}

    SciTech Connect (OSTI)

    Wang, C.; Seinige, H.; Tsoi, M.; Cao, G.; Zhou, J.-S.; Goodenough, J. B.

    2015-05-07

    Temperature-dependent magnetotransport properties of the antiferromagnetic semiconductor Sr{sub 2}IrO{sub 4} are investigated with point-contact devices. The point-contact technique allows to probe very small volumes and, therefore, to look for electronic transport on a microscopic scale. Point-contact measurements with single crystals of Sr{sub 2}IrO{sub 4} were intended to see whether the additional local resistance associated with a small contact area between a sharpened Cu tip and the antiferromagnet shows magnetoresistance (MR) such as that seen in bulk crystals. Point-contact measurements at liquid nitrogen temperature revealed large MRs (up to 28%) for modest magnetic fields (250 mT) applied within an IrO{sub 2} (ab) plane with angular dependence showing a crossover from four-fold to two-fold symmetry with an increasing magnetic field. Point contact measurement exhibits distinctive anisotropic magnetoresistance (AMR) in comparison to a bulk experiment, imposing intriguing questions about the mechanism of AMR in this material. Temperature-dependent MR measurements show that the MR falls to zero at the Neel temperature, but the temperature dependence of the MR ratio differs qualitatively from that of the resistivity. This AMR study helps to unveil the entanglement between electronic transport and magnetism in Sr{sub 2}IrO{sub 4} while the observed magnetoresistive phenomena can be potentially used to sense the antiferromagnetic order parameter in spintronic applications.

  20. Thermodynamics and superconductivity of Th7(Fe, Ru, Os, Co, Rh, Ir)3 system

    SciTech Connect (OSTI)

    Smith, James L; Lashley, Jason C; Volz, Heather M; Fisher, Robert A

    2008-01-01

    Expanding the temperature range of previous specific-heat measurements on the Th7(Fe, Ru, Os, Co, Rh, Ir)3 system, we measure the effect of transition-metal substitution on total entropy (S{sub 298 k}), electronic specific heat ({gamma}), and Debye temperature ({Theta}D). In addition we measure the pressure dependence, up to 10 kbar, of the superconducting transition.

  1. Comparative Investigation of Benzene Steam Reforming over Spinel Supported Rh and Ir Catalysts

    SciTech Connect (OSTI)

    Mei, Donghai; Lebarbier, Vanessa M.; Rousseau, Roger; Glezakou, Vassiliki-Alexandra; Albrecht, Karl O.; Kovarik, Libor; Flake, Matt; Dagle, Robert A.

    2013-06-07

    In a combined experimental and first-principles density functional theory (DFT) study, benzene steam reforming (BSR) over MgAl2O4 supported Rh and Ir catalysts was investigated. Experimentally, it has been found that both highly dispersed Rh and Ir clusters (1-2 nm) on the MgAl2O4 spinel support are stable during the BSR in the temperature range of 700-850°C. Compared to the Ir/MgAl2O4 catalyst, the Rh/MgAl2O4 catalyst is more active with higher benzene turnover frequency and conversion. At typical steam conditions with the steam-to-carbon ratio > 12, the benzene conversion is only a weak function of the H2O concentration in the feed. This suggests that the initial benzene decomposition step rather than the benzene adsorption is most likely the rate-determined step in BSR over supported Rh and Ir catalysts. In order to understand the differences between the two catalysts, we followed with a comparative DFT study of initial benzene decomposition pathways over two representative model systems for each supported metal (Rh and Ir) catalysts. A periodic terrace (111) surface and an amorphous 50-atom metal cluster with a diameter of 1.0 nm were used to represent the two supported model catalysts under low and high dispersion conditions. Our DFT results show that the decreasing catalyst particle size enhances the benzene decomposition on supported Rh catalysts by lowering both C-C and C-H bond scission. The activation barriers of the C-C and the C-H bond scission decrease from 1.60 and 1.61 eV on the Rh(111) surface to 1.34 and 1.26 eV on the Rh50 cluster. For supported Ir catalysts, the decreasing particle size only affects the C-C scission. The activation barrier of the C-C scission of benzene decreases from 1.60 eV on the Ir(111) surface to 1.35 eV on the Ir50 cluster while the barriers of the C-H scission are practically the same. The experimentally measured higher BSR

  2. GaSb substrates with extended IR wavelength for advanced space based applications

    SciTech Connect (OSTI)

    Allen, Lisa P.; Flint, Patrick; Dallas, Gordon; Bakken, Daniel; Blanchat, Kevin; Brown, Gail J.; Vangala, Shivashankar R.; Goodhue, William D.; Krishnaswami, Kannan

    2009-05-01

    GaSb substrates have advantages that make them attractive for implementation of a wide range of infrared (IR) detectors with higher operating temperatures for stealth and space based applications. A significant aspect that would enable widespread commercial application of GaSb wafers for very long wavelength IR (VLWIR) applications is the capability for transmissivity beyond 15 m. Due largely to the GaSb (antisite) defect and other point defects in undoped GaSb substrates, intrinsic GaSb is still slightly p-type and strongly absorbs in the VLWIR. This requires backside thinning of the GaSb substrate for IR transmissivity. An extremely low n-type GaSb substrate is preferred to eliminate thinning and provide a substrate solution for backside illuminated VLWIR devices. By providing a more homogeneous radial distribution of the melt solute to suppress GaSb formation and controlling the cooling rate, ultra low doped n:GaSb has been achieved. This study examines the surface properties and IR transmission spectra of ultra low doped GaSb substrates at both room and low temperatures. Atomic force microscopy (AFM), homoepitaxy by MBE, and infrared Fourier transform (FTIR) analysis was implemented to examine material quality. As compared with standard low doped GaSb, the ultra low doped substrates show over 50% transmission and consistent wavelength transparency past 23 m with improved %T at low temperature. Homoepitaxy and AFM results indicate the ultra low doped GaSb has a low thermal desorbtion character and qualified morphology. In summary, improvements in room temperature IR transmission and extended wavelength characteristics have been shown consistently for ultra low doped n:GaSb substrates.

  3. A first principle study for the adsorption and absorption of carbon atom and the CO dissociation on Ir(100) surface

    SciTech Connect (OSTI)

    Erikat, I. A.; Hamad, B. A.

    2013-11-07

    We employ density functional theory to examine the adsorption and absorption of carbon atom as well as the dissociation of carbon monoxide on Ir(100) surface. We find that carbon atoms bind strongly with Ir(100) surface and prefer the high coordination hollow site for all coverages. In the case of 0.75 ML coverage of carbon, we obtain a bridging metal structure due to the balance between Ir–C and Ir–Ir interactions. In the subsurface region, the carbon atom prefers the octahedral site of Ir(100) surface. We find large diffusion barrier for carbon atom into Ir(100) surface (2.70 eV) due to the strong bonding between carbon atom and Ir(100) surface, whereas we find a very small segregation barrier (0.22 eV) from subsurface to the surface. The minimum energy path and energy barrier for the dissociation of CO on Ir(100) surface are obtained by using climbing image nudge elastic band. The energy barrier of CO dissociation on Ir(100) surface is found to be 3.01 eV, which is appreciably larger than the association energy (1.61 eV) of this molecule.

  4. Platinum-monolayer Electrocatalysts: Palladium Interlayer on IrCo Alloy Core Improves Activity in Oxygen-reduction Reaction

    SciTech Connect (OSTI)

    Gong, K.; Chen, W.-F.; Sasaki, K.; Su, D.; Vukmirovic, M.B.; Zhou, W.; Izzo, E.L.; Perez-Acosta, C.; Hirunsit, P.; Balbuena, P.B.; Adzic, R.R.

    2010-11-15

    We describe the synthesis and electrocatalytic properties of a new low-Pt electrocatalyst consisting of an IrCo core, a Pd interlayer, and a surface Pt monolayer, emphasizing the interlayer's role in improving electrocatalytic activity for the oxygen-reduction reaction on Pt in HClO{sub 4} solution. We prepared the IrCo alloys by decomposing, at 800 C, hexacyanometalate, KCoIr(CN){sub 6}, adsorbed on the carbon surfaces. The synthesis of Ir{sub 3}Co/C involved heating a mix of metal salts and carbon in hydrogen at 500 C. Thereafter, we placed a palladium and/or platinum monolayer on them via the galvanic displacement of an underpotentially deposited copper monolayer. The electrocatalysts were characterized using structural- and electrochemical-techniques. For PtML/PdML/IrCo/C, we observed a Pt mass activity of 1.18 A/mg{sub (Pt)} and the platinum-group-metals mass of 0.16 A/mg{sub (Pt, Pd, Ir)}. In comparison, without a Pd interlayer, i.e., Pt{sub ML}/IrCo/C, the activities of 0.15 A/mg{sub (Pt)} and 0.036 A/mg{sub (Pt, Pd, Ir)} were considerably lower. We consider that the palladium interlayer plays an essential role in achieving high catalytic activity by adjusting the electronic interaction of the platinum monolayer with the IrCo core, so that it accelerates the kinetics of adsorption and desorption of the intermediates of oxygen reduction. A similar trend was observed for Pt{sub ML}/Pd{sub ML} and Pt{sub ML} deposited on Ir{sub 3}Co/C alloy core. We used density functional theory to interpret the observed phenomena.

  5. Curing the UV/IR mixing for field theories with translation-invariant star products

    SciTech Connect (OSTI)

    Tanasa, Adrian; Vitale, Patrizia

    2010-03-15

    The ultraviolet/infrared (UV/IR) mixing of noncommutative field theories has been recently shown to be a generic feature of translation-invariant associative products. In this paper we propose to take into account the quantum corrections of the model to modify in this way the noncommutative action. This idea was already used to cure the UV/IR mixing for theories on Moyal space. We show that in the present framework also, this proposal proves successful for curing the mixing. We achieve this task by explicit calculations of one and higher loops Feynman amplitudes. For the sake of completeness, we compute the form of the new action in the matrix base for the Wick-Voros product.

  6. I/O impedance controller

    DOE Patents [OSTI]

    Ruesch, Rodney; Jenkins, Philip N.; Ma, Nan

    2004-03-09

    There is disclosed apparatus and apparatus for impedance control to provide for controlling the impedance of a communication circuit using an all-digital impedance control circuit wherein one or more control bits are used to tune the output impedance. In one example embodiment, the impedance control circuit is fabricated using circuit components found in a standard macro library of a computer aided design system. According to another example embodiment, there is provided a control for an output driver on an integrated circuit ("IC") device to provide for forming a resistor divider network with the output driver and a resistor off the IC device so that the divider network produces an output voltage, comparing the output voltage of the divider network with a reference voltage, and adjusting the output impedance of the output driver to attempt to match the output voltage of the divider network and the reference voltage. Also disclosed is over-sampling the divider network voltage, storing the results of the over sampling, repeating the over-sampling and storing, averaging the results of multiple over sampling operations, controlling the impedance with a plurality of bits forming a word, and updating the value of the word by only one least significant bit at a time.

  7. SC11-IO.pptx

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

    sharing of files as persistent storage over a network. * Network File System (protocol) (NFS) - Widely used and available, but not developed as a standard for high- performance...

  8. I/O Library List

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

    Help Staff Blogs Request Repository Mailing List Need Help? Out-of-hours Status and Password help Call operations: 1-800-66-NERSC, option 1 or 510-486-6821 Account Support ...

  9. Practical Analysis of materials with depth varying compositions using FT-IR photoacoustic spectroscopy (PAS)

    SciTech Connect (OSTI)

    J.F. McClelland; R.W. Jones; Siquan Luo

    2004-09-30

    FT-IR photoacoustic spectroscopy (PAS) is discussed as a nondestructive method to probe the molecular composition of materials versus depth on the basis of the analysis of layers of experimentally controllable thickness, which are measured from the sample surface to depths of some tens of micrometers, depending on optical and thermal properties. Computational methods are described to process photoacoustic amplitude and phase spectra for both semi-quantitative and quantitative depth analyses. These methods are demonstrated on layered and gradient samples.

  10. An Improved Daylight Correction for IR Loss in ARM Diffuse SW Measurements

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

    An Improved Daylight Correction for IR Loss in ARM Diffuse SW Measurements C. N. Long, K. Younkin, and K. L. Gaustad Pacific Northwest National Laboratory Richland, Washington J. A. Augustine National Oceanic and Atmospheric Administration Air Resources Laboratory Surface Radiation Research Branch Boulder, Colorado Introduction A paper by Cess et al. (2000) notes that some clear-sky diffuse shortwave (SW) measurements they were using from the Atmospheric Radiation Measurement (ARM) Southern

  11. Structurally Integrated Coatings for Wear and Corrosion (SICWC): Arc Lamp, InfraRed (IR) Thermal Processing

    SciTech Connect (OSTI)

    Mackiewicz-Ludtka, G.; Sebright, J.

    2007-12-15

    The primary goal of this Cooperative Research and Development Agreement (CRADA) betwe1311 UT-Battelle (Contractor) and Caterpillar Inc. (Participant) was to develop the plasma arc lamp (PAL), infrared (IR) thermal processing technology 1.) to enhance surface coating performance by improving the interfacial bond strength between selected coatings and substrates; and 2.) to extend this technology base for transitioning of the arc lamp processing to the industrial Participant. Completion of the following three key technical tasks (described below) was necessary in order to accomplish this goal. First, thermophysical property data sets were successfully determined for composite coatings applied to 1010 steel substrates, with a more limited data set successfully measured for free-standing coatings. These data are necessary for the computer modeling simulations and parametric studies to; A.) simulate PAL IR processing, facilitating the development of the initial processing parameters; and B.) help develop a better understanding of the basic PAL IR fusing process fundamentals, including predicting the influence of melt pool stirring and heat tnmsfar characteristics introduced during plasma arc lamp infrared (IR) processing; Second, a methodology and a set of procedures were successfully developed and the plasma arc lamp (PAL) power profiles were successfully mapped as a function of PAL power level for the ORNL PAL. The latter data also are necessary input for the computer model to accurately simulate PAL processing during process modeling simulations, and to facilitate a better understand of the fusing process fundamentals. Third, several computer modeling codes have been evaluated as to their capabilities and accuracy in being able to capture and simulate convective mixing that may occur during PAL thermal processing. The results from these evaluation efforts are summarized in this report. The intention of this project was to extend the technology base and provide for

  12. Improved ARM-SGP TOA OLR Fluxes from GOES-8 IR Radiances Based on CERES Data

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

    ARM-SGP TOA OLR Fluxes from GOES-8 IR Radiances Based on CERES Data D. R. Doelling and M. M. Khaiyer Analytical Services and Materials, Inc. Hampton, Virginia P. Minnis National Aeronautics and Space Administration Langley Research Center Hampton, Virginia Introduction The radiation budget at the top of the atmosphere (TOA) is a quantity of fundamental importance to the Atmospheric Radiation Measurement (ARM) Program. Thus, it is necessary to measure the radiation budget components, broadband

  13. An industrial FT-IR process gas analyzer for stack gas cems analysis

    SciTech Connect (OSTI)

    Welch, G.M.; Herman, B.E.

    1995-12-31

    This paper describes utilizing Fourier Transform Infrared (FT-IR) technology to meet and exceed EPA requirements to Continuously Monitor Carbon Monoxide (CO) and Sulfur Dioxide (SO){sub 2} in an oil refinery. The application consists of Continuous Emission Monitoring (CEMS) of two stacks from a Fluid Catalytic Cracking unit (FCCU). The discussion will follow the project from initial specifications, installation, start-up, certification results (RATA, 7 day drift), Cylinder Gas Audit (CGA) and the required maintenance. FT-IR is a powerful analytical tool suitable for measurement of stack component gases required to meet CEMS regulations, and allows simultaneous multi-component analysis of complex stack gas streams with a continuous sample stream flow through the measurement cell. The Michelson Interferometer in a unique {open_quotes}Wishbone{close_quotes} design and with a special alignment control enables standardized configuration of the analyzer for flue gas analysis. Normal stack gas pollutants: NO{sub x}, SO{sub 2}, and CO; as well as water soluble pollutants such as NH{sub 3} and HCI may be accurately determined and reported even in the presence of 0-31 Vol % water vapor concentrations (hot and wet). This FT-IR analyzer has been operating with EPA Certification in an oil refinery environment since September 1994.

  14. The first photometric analysis of the near contact binary IR Cas

    SciTech Connect (OSTI)

    Li, Kai; Hu, S.-M.; Guo, D.-F.; Jiang, Y.-G.; Gao, D.-Y.; Chen, X. E-mail: likai@ynao.ac.cn E-mail: difu@sdu.edu.cn

    2014-11-01

    The first photometric analysis of IR Cas was carried out based on the new observed BVRI light curves. The symmetric light curves and nearly flat secondary minimum indicate that very precise photometric results can be determined. We found that IR Cas is a near contact binary with the primary component filling its Roche lobe. An analysis of the O – C diagram based on all available times of minimum light reveals evidence for a periodic change with a semi-amplitude of 0.0153 days and a period of 39.7 yr superimposed on a secular decrease at a rate of dp/dt = –1.28(± 0.09) × 10{sup –7} days yr{sup –1}. The most reasonable explanation for the periodic change is the light time-travel effect due to a third body. The period decrease may be caused by mass transfer from the primary component to the secondary. With the decreasing period, IR Cas would eventually evolve into a contact system.

  15. NGC 7538 IRS. 1. Interaction of a polarized dust spiral and a molecular outflow

    SciTech Connect (OSTI)

    Wright, M. C. H.; Hull, Charles L. H. [Department of Astronomy, University of California, Berkeley, CA 94720 (United States); Pillai, Thushara [Max Planck Institut fr Radioastronomie, Auf dem Hgel 69, D-53121 Bonn (Germany); Zhao, Jun-Hui [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Sandell, Gran, E-mail: jzhao@cfa.harvard.edu [SOFIA-USRA, NASA Ames Research Center, MS 232-12, Building N232, Room 146, PO Box 1, Moffett Field, CA 94035-0001 (United States)

    2014-12-01

    We present dust polarization and CO molecular line images of NGC 7538 IRS 1. We combined data from the Submillimeter Array, the Combined Array for Research in Millimeter-wave Astronomy, and the James Clerk Maxwell Telescope to make images with ?2.''5 resolution at 230 and 345 GHz. The images show a remarkable spiral pattern in both the dust polarization and molecular outflow. These data dramatically illustrate the interplay between a high infall rate onto IRS 1 and a powerful outflow disrupting the dense, clumpy medium surrounding the star. The images of the dust polarization and the CO outflow presented here provide observational evidence for the exchange of energy and angular momentum between the infall and the outflow. The spiral dust pattern, which rotates through over 180 from IRS 1, may be a clumpy filament wound up by conservation of angular momentum in the infalling material. The redshifted CO emission ridge traces the dust spiral closely through the MM dust cores, several of which may contain protostars. We propose that the CO maps the boundary layer where the outflow is ablating gas from the dense gas in the spiral.

  16. Mid-IR laser action in the H{sub 3} Rydberg molecule and some possible astrophysical implications

    SciTech Connect (OSTI)

    Saykally, Richard J.

    2015-01-22

    Mid-IR lasing has been observed in supersonic plasmas and assigned to d to p transitions in tri-atomic hydrogen Rydberg states. Possible astrophysical implications are discussed.

  17. Role of the antiferromagnetic pinning layer on spin wave properties in IrMn/NiFe based spin-valves

    SciTech Connect (OSTI)

    Gubbiotti, G. Tacchi, S.; Del Bianco, L.; Bonfiglioli, E.; Giovannini, L.; Spizzo, F.; Zivieri, R.; Tamisari, M.

    2015-05-07

    Brillouin light scattering (BLS) was exploited to study the spin wave properties of spin-valve (SV) type samples basically consisting of two 5 nm-thick NiFe layers (separated by a Cu spacer of 5 nm), differently biased through the interface exchange coupling with an antiferromagnetic IrMn layer. Three samples were investigated: a reference SV sample, without IrMn (reference); one sample with an IrMn underlayer (10 nm thick) coupled to the bottom NiFe film; one sample with IrMn underlayer and overlayer of different thickness (10 nm and 6 nm), coupled to the bottom and top NiFe film, respectively. The exchange coupling with the IrMn, causing the insurgence of the exchange bias effect, allowed the relative orientation of the NiFe magnetization vectors to be controlled by an external magnetic field, as assessed through hysteresis loop measurements by magneto-optic magnetometry. Thus, BLS spectra were acquired by sweeping the magnetic field so as to encompass both the parallel and antiparallel alignment of the NiFe layers. The BLS results, well reproduced by the presented theoretical model, clearly revealed the combined effects on the spin dynamic properties of the dipolar interaction between the two NiFe films and of the interface IrMn/NiFe exchange coupling.

  18. Transition from the infalling envelope to the Keplerian disk around L1551 IRS 5

    SciTech Connect (OSTI)

    Chou, Ti-Lin [Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan (China); Takakuwa, Shigehisa; Yen, Hsi-Wei; Ohashi, Nagayoshi; Ho, Paul T. P., E-mail: tlchou@asiaa.sinica.edu.tw [Academia Sinica Institute of Astronomy and Astrophysics, P. O. Box 23-141, Taipei 10617, Taiwan (China)

    2014-11-20

    We present combined Submillimeter Array (SMA) +Atacama Submillimeter Telescope Experiment (ASTE) images of the Class I protobinary L1551 IRS 5 in the CS (J = 7-6) line, the submillimeter images of L1551 IRS 5 with the most complete spatial sampling ever achieved (0.''9-36''). The SMA image of L1551 IRS 5 in the 343 GHz dust-continuum emission is also presented, which shows an elongated feature along the northwest to southeast direction (?160 AU 80 AU), perpendicular to the associated radio jets. The combined SMA+ASTE images show that the high-velocity (?1.5 km s{sup 1}) CS emission traces the structure of the dust component and shows a velocity gradient along the major axis, which is reproduced by a geometrically thin Keplerian-disk model with a central stellar mass of ?0.5 M {sub ?}. The low-velocity (?1.3 km s{sup 1}) CS emission shows an extended (?1000 AU) feature that exhibits slight south (blueshifted) to north (redshifted) emission offsets, which is modeled with a rotating and infalling envelope with a conserved angular momentum. The rotational motion of the envelope connects smoothly to the inner Keplerian rotation at a radius of ?64 AU. The infalling velocity of the envelope is ?three times lower than the free-fall velocity toward the central stellar mass of 0.5 M {sub ?}. These results demonstrate transition from the infalling envelope to the Keplerian disk, consistent with the latest theoretical studies of disk formation. We suggest that sizable (r ? 50-200 AU) Keplerian disks are already formed when the protostars are still deeply embedded in the envelopes.

  19. Phase-matched generation of coherent soft and hard X-rays using IR lasers

    DOE Patents [OSTI]

    Popmintchev, Tenio V.; Chen, Ming-Chang; Bahabad, Alon; Murnane, Margaret M.; Kapteyn, Henry C.

    2013-06-11

    Phase-matched high-order harmonic generation of soft and hard X-rays is accomplished using infrared driving lasers in a high-pressure non-linear medium. The pressure of the non-linear medium is increased to multi-atmospheres and a mid-IR (or higher) laser device provides the driving pulse. Based on this scaling, also a general method for global optimization of the flux of phase-matched high-order harmonic generation at a desired wavelength is designed.

  20. Simulations of the infrared, Raman, and 2D-IR photon echo spectra of water in nanoscale silica pores

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

    Burris, Paul C.; Laage, Damien; Thompson, Ward H.

    2016-05-20

    Vibrational spectroscopy is frequently used to characterize nanoconfined liquids and probe the effect of the confining framework on the liquid structure and dynamics relative to the corresponding bulk fluid. However, it is still unclear what molecular-level information can be obtained from such measurements. In this Paper, we address this question by using molecular dynamics (MD) simulations to reproduce the linear infrared (IR), Raman, and two-dimensional IR (2D-IR) photon echo spectra for water confined within hydrophilic (hydroxyl-terminated) silica mesopores. To simplify the spectra the OH stretching region of isotopically dilute HOD in D2O is considered. An empirical mapping approach is usedmore » to obtain the OH vibrational frequencies, transition dipoles, and transition polarizabilities from the MD simulations. The simulated linear IR and Raman spectra are in good general agreement with measured spectra of water in mesoporous silica reported in the literature. The key effect of confinement on the water spectrum is a vibrational blueshift for OH groups that are closest to the pore interface. The blueshift can be attributed to the weaker hydrogen bonds (H-bonds) formed between the OH groups and silica oxygen acceptors. Non-Condon effects greatly diminish the contribution of these OH moieties to the linear IR spectrum, but these weaker H-bonds are readily apparent in the Raman spectrum. The 2D-IR spectra have not yet been measured and thus the present results represent a prediction. Lastly, the simulated spectra indicate that it should be possible to probe the slower spectral diffusion of confined water compared to the bulk liquid by analysis of the 2D-IR spectra.« less

  1. Sonic IR crack detection of aircraft turbine engine blades with multi-frequency ultrasound excitations

    SciTech Connect (OSTI)

    Zhang, Ding; Han, Xiaoyan; Newaz, Golam

    2014-02-18

    Effectively and accurately detecting cracks or defects in critical engine components, such as turbine engine blades, is very important for aircraft safety. Sonic Infrared (IR) Imaging is such a technology with great potential for these applications. This technology combines ultrasound excitation and IR imaging to identify cracks and flaws in targets. In general, failure of engine components, such as blades, begins with tiny cracks. Since the attenuation of the ultrasound wave propagation in turbine engine blades is small, the efficiency of crack detection in turbine engine blades can be quite high. The authors at Wayne State University have been developing the technology as a reliable tool for the future field use in aircraft engines and engine parts. One part of the development is to use finite element modeling to assist our understanding of effects of different parameters on crack heating while experimentally hard to achieve. The development has been focused with single frequency ultrasound excitation and some results have been presented in a previous conference. We are currently working on multi-frequency excitation models. The study will provide results and insights of the efficiency of different frequency excitation sources to foster the development of the technology for crack detection in aircraft engine components.

  2. Laser separation of nitrogen isotopes by the IR+UV dissociation of ammonia molecules

    SciTech Connect (OSTI)

    Apatin, V M; Klimin, S A; Laptev, V B; Lokhman, V N; Ogurok, D D; Pigul'skii, S V; Ryabov, E A

    2008-08-31

    The separation of nitrogen isotopes is studied upon successive single-photon IR excitation and UV dissociation of ammonia molecules. The excitation selectivity was provided by tuning a CO{sub 2} laser to resonance with {sup 14}NH{sub 3} molecules [the 9R(30) laser line] or with {sup 15}NH{sub 3} molecules [the 9R(10) laser line]. Isotopic mixtures containing 4.8% and 0.37% (natural content) of the {sup 15}NH isotope were investigated. The dependences of the selectivity and the dissociation yield for each isotopic component on the buffer gas pressure (N{sub 2}, O{sub 2}, Ar) and the ammonia pressure were obtained. In the limit of low NH{sub 3} pressures (0.5-2 Torr), the dissociation selectivity {alpha}(15/14) for {sup 15}N was 17. The selectivity mechanism of the IR+UV dissociation is discussed and the outlook is considered for the development of the nitrogen isotope separation process based on this approach. (laser isotope separation)

  3. Graphene oxide/carbon nanoparticle thin film based IR detector: Surface properties and device characterization

    SciTech Connect (OSTI)

    Chowdhury, Farzana Aktar; Hossain, Mohammad Abul; Uchida, Koji; Tamura, Takahiro; Sugawa, Kosuke; Mochida, Tomoaki; Otsuki, Joe; Mohiuddin, Tariq; Boby, Monny Akter; Alam, Mohammad Sahabul

    2015-10-15

    This work deals with the synthesis, characterization, and application of carbon nanoparticles (CNP) adorned graphene oxide (GO) nanocomposite materials. Here we mainly focus on an emerging topic in modern research field presenting GO-CNP nanocomposite as a infrared (IR) radiation detector device. GO-CNP thin film devices were fabricated from liquid phase at ambient condition where no modifying treatments were necessary. It works with no cooling treatment and also for stationary objects. A sharp response of human body IR radiation was detected with time constants of 3 and 36 sec and radiation responsivity was 3 mAW{sup −1}. The current also rises for quite a long time before saturation. This work discusses state-of-the-art material developing technique based on near-infrared photon absorption and their use in field deployable instrument for real-world applications. GO-CNP-based thin solid composite films also offer its potentiality to be utilized as p-type absorber material in thin film solar cell, as well.

  4. Synthesis, phase relationship and crystal structure of the new binary compound Ir{sub 13}Al{sub 45}

    SciTech Connect (OSTI)

    Bostroem, Magnus . E-mail: bostroem@cpfs.mpg.de; Niewa, Rainer; Prots, Yurii; Grin, Yuri

    2005-01-15

    The new phase Ir{sub 13}Al{sub 45} was synthesized in equilibrium with an aluminum-rich melt. Its crystal structure was established from single-crystal diffraction data. The compound crystallizes in the space group Pnma and represents a novel structure type (Pearson symbol oP232, a=16.760(2)A, b=12.321(1)A, c=17.425(2)A). The structure can essentially be described as a simple hexagonal column packing of pseudopentagonal columns formed by irregular Al polyhedra centered by Ir atoms. Ir{sub 13}Al{sub 45} forms peritectically at 895 deg. C and exists in equilibrium with the melt in a narrow temperature interval of 19 deg. C.

  5. Structure symmetry determination and magnetic evolution in Sr2Ir1–xRhxO4

    SciTech Connect (OSTI)

    Ye, Feng; Wang, Xiaoping; Hoffmann, Christina; Wang, Jinchen; Chi, Songxue; Matsuda, Masaaki; Chakoumakos, Bryan C.; Fernandez-Baca, Jaime A.; Cao, Gang

    2015-11-23

    We use single-crystal neutron diffraction to determine the crystal structure symmetry and to study the magnetic evolution in the rhodium doped iridates Sr2Ir1–xRhxO4 (0 ≤ x ≤ 0.16). Throughout this doping range, the crystal structure retains a tetragonal symmetry (space group I41/a) with two distinct magnetic Ir sites in the unit cell forming staggered IrO6 rotation. Upon Rh doping, the magnetic order is suppressed and the magnetic moment of Ir4+ is reduced from 0.21 μB/Ir for x = 0 to 0.18 μB/Ir for x = 0.12. As a result, the magnetic structure at x = 0.12 is different from that of the parent compound while the moments remain in the basal plane.

  6. Graphene-silicon layered structures on single-crystalline Ir(111) thin films

    SciTech Connect (OSTI)

    Que, Yande D.; Tao, Jing; Zhang, Yong; Wang, Yeliang L.; Wu, Lijun J.; Zhu, Yimei M.; Kim, Kisslinger; Weinl, Michael; Schreck, Matthias; Shen, Chengmin M.; Du, Shixuan X.; Liu, Yunqi Q.; Gao, H. -J.; Huang, Li; Xu, Wenyan Y.

    2015-01-20

    Epitaxial growth of graphene on transition metal crystals, such as Ru,⁽¹⁻³⁾ Ir,⁽⁴⁻⁶⁾ and Ni,⁽⁷⁾ provides large-area, uniform graphene layers with controllable defect density, which is crucial for practical applications in future devices. To decrease the high cost of single-crystalline metal bulks, single-crystalline metal films are strongly suggested as the substrates for epitaxial growth large-scale high-quality graphene.⁽⁸⁻¹⁰⁾ Moreover, in order to weaken the interactions of graphene with its metal host, which may result in a suppression of the intrinsic properties of graphene,⁽¹¹ ¹²⁾ the method of element intercalation of semiconductors at the interface between an epitaxial graphene layer and a transition metal substrate has been successfully realized.⁽¹³⁻¹⁶⁾

  7. Graphene-silicon layered structures on single-crystalline Ir(111) thin films

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

    Que, Yande D.; Tao, Jing; Zhang, Yong; Wang, Yeliang L.; Wu, Lijun J.; Zhu, Yimei M.; Kim, Kisslinger; Weinl, Michael; Schreck, Matthias; Shen, Chengmin M.; et al

    2015-01-20

    Epitaxial growth of graphene on transition metal crystals, such as Ru,⁽¹⁻³⁾ Ir,⁽⁴⁻⁶⁾ and Ni,⁽⁷⁾ provides large-area, uniform graphene layers with controllable defect density, which is crucial for practical applications in future devices. To decrease the high cost of single-crystalline metal bulks, single-crystalline metal films are strongly suggested as the substrates for epitaxial growth large-scale high-quality graphene.⁽⁸⁻¹⁰⁾ Moreover, in order to weaken the interactions of graphene with its metal host, which may result in a suppression of the intrinsic properties of graphene,⁽¹¹ ¹²⁾ the method of element intercalation of semiconductors at the interface between an epitaxial graphene layer and a transitionmore » metal substrate has been successfully realized.⁽¹³⁻¹⁶⁾« less

  8. In Situ Diffuse Reflectance IR Spectroscopy and X-ray Absorption Spectroscopy for Fast Catalytic Processes

    SciTech Connect (OSTI)

    N Marinkovic; Q Wang; A Frenkel

    2011-12-31

    A new instrument for synchronous in situ investigations of catalytic materials by IR and X-ray absorption spectroscopies was designed and built at the X18A beamline of the National Synchrotron Light Source of Brookhaven National Laboratory. It provides analytical tools for solving structural, electronic and kinetic problems in catalysis science by two complementary methods. Among the features attractive for catalysis research are the broad range of catalytically active elements that can be investigated (starting with Ni and beyond), the wide range of reaction conditions (temperatures up to 873 K, various reactive gases) and time scales (starting from tens of seconds). The results of several representative experiments that illustrate the attractive capabilities of the new set-up are discussed.

  9. DESIGN AND CONSTRUCTION OF A 15 T, 120 MM BORE IR QUADRUPOLE MAGNET FOR LARP

    SciTech Connect (OSTI)

    Caspi, S.; Cheng, D.; Dietderich, D.; Felice, H.; Ferracin, P.; Hafalia, R.; Hannaford, R.; Sabbi, G. S.; Anerella, M.; Ghosh, A.; Schmalzle, J.; Wanderer, P.; Ambrosio, G.; Bossert, R.; Kashikhin, V.; Pasholk, D.; Zlobin, A.

    2009-05-04

    Pushing accelerator magnets beyond 10 T holds a promise of future upgrades to machines like the Large Hadron Collider (LHC) at CERN. Nb{sub 3}Sn conductor is at the present time the only practical superconductor capable of generating fields beyond 10 T. In support of the LHC Phase-II upgrade, the US LHC Accelerator Research Program (LARP) is developing a large bore (120 mm) IR quadrupole (HQ) capable of reaching 15 T at its conductor peak field and a peak gradient of 219 T/m at 1.9 K. While exploring the magnet performance limits in terms of gradient, forces and stresses the 1 m long two-layer coil will demonstrate additional features such as alignment and accelerator field quality. In this paper we summarize the design and report on the magnet construction progress.

  10. In-situ FT-IR diagnostics for monitoring and control of fossil fuel combustion

    SciTech Connect (OSTI)

    Bonanno, A.S.; Wojtowicz, M.A.; Serio, M.A.; Nelson, C.M.; Solomon, P.R.

    1995-12-31

    This paper describes the development and testing of a prototype fourier transform infrared (FT-IR) based measurement system for continuous emission monitoring (CEM) and process control in fossil fuel-fired power plants. On several occasions, prototype systems have been transported and assembled at full-scale and pilot-scale fossil fuel-fired combustors. The in-situ version of the prototype is able to measure NH{sub 3} and HCl concentrations, which are difficult to measure extractively, as well as CO, CO{sub 2}, NO{sub x}, H{sub 2}O, and SO{sub x} concentrations. The results of recent tests will be presented which involve in-situ monitoring of selective non-catalytic reduction (SNCR) of NO{sub x} based on simultaneous measurement of NO, NH{sub 3} and CO.

  11. On the Relative Utility of Infrared (IR) versus Terahertz (THz) for Optical Sensors

    SciTech Connect (OSTI)

    Johnson, Timothy J.; Valentine, Nancy B.; Gassman, Paul L.; Atkinson, David A.; Sharpe, Steven W.; Williams, Stephen D.

    2007-11-30

    Pacific Northwest National Laboratory (PNNL) has active programs investigating the optical absorption strengths of several types of molecules including toxic industrial chemicals (TICs), microbiological threats such as bacteria, as well as explosives such as RDX, PETN and TNT. While most of our work has centered on the mid-infrared domain (600 to 6,500 cm-1), more recent work has also included work in the far-infrared, also called the terahertz (THz) region (500 to ~8 cm-1). Using Fourier transform infrared spectroscopy, we have been able to compare the relative, and in some cases absolute, IR/THz cross sections of a number of species in the solid and liquid phases. The relative band strengths of a number of species of interest are discussed in terms of both experimental and computational results.

  12. Effect of Field Errors in Muon Collider IR Magnets on Beam Dynamics

    SciTech Connect (OSTI)

    Alexahin, Y.; Gianfelice-Wendt, E.; Kapin, V.V.; /Fermilab

    2012-05-01

    In order to achieve peak luminosity of a Muon Collider (MC) in the 10{sup 35} cm{sup -2}s{sup -1} range very small values of beta-function at the interaction point (IP) are necessary ({beta}* {le} 1 cm) while the distance from IP to the first quadrupole can not be made shorter than {approx}6 m as dictated by the necessity of detector protection from backgrounds. In the result the beta-function at the final focus quadrupoles can reach 100 km making beam dynamics very sensitive to all kind of errors. In the present report we consider the effects on momentum acceptance and dynamic aperture of multipole field errors in the body of IR dipoles as well as of fringe-fields in both dipoles and quadrupoles in the ase of 1.5 TeV (c.o.m.) MC. Analysis shows these effects to be strong but correctable with dedicated multipole correctors.

  13. Interaction of mineral surfaces with simple organci molecules by diffuse reflectance IR spectroscopy (DRIFT)

    SciTech Connect (OSTI)

    Joan Thomas; Michael Kelley

    2007-06-18

    Diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS) was used to characterize multi-layers of lysine, glutamic acid and salicylic acid on ?-alumina and kaolinite surfaces. The results agreed well with those previously obtained by ATR-IR in aqueous media where available, indicating that DRIFT may be regarded as effectively an in-situ spectroscopy for these materials. In the case of salicylic acid adsorption onto ?-alumina, DRIFTS was used to identify monolayer coverage and to detect molecules down to coverage of 3% of a monolayer. The spectroscopic results as to coverage were confirmed by analysis of the solutions used for treatment. The spectra obtained allowed identification of changes in the bonding environment with increasing surface coverage. DRIFTS, offers several advantages in terms of materials, experimental technique and data treatment, motivating further investigations.

  14. Ternary Electrocatalysts for Oxidizing Ethanol to Carbon Dioxide: Making Ir Capable of Splitting C-C bond

    SciTech Connect (OSTI)

    Li, Meng; Cullen, David A; Sasaki, Kotaro; Marinkovic, N.; More, Karren Leslie; Adzic, Radoslav R.

    2013-01-01

    Splitting the C-C bond is the main obstacle to electroxidation of ethanol (EOR) to CO2. We recently demonstrated that the ternary PtRhSnO2 electrocatalyst can accomplish that reaction at room temperature with Rh having a unique capability to split the C-C bond. In this article we report the finding that Ir can be induced to split the C-C bond as a component of the ternary catalyst. We synthesized, characterized and compared the properties of several ternary electrocatalysts. Carbon-supported nanoparticle (NP) electrocatalysts comprising a SnO2 NP core decorated with multi-metallic nanoislands (MM = PtIr, PtRh, IrRh, PtIrRh) were prepared using a seeded growth approach. An array of characterization techniques were employed to establish the composition and architecture of the synthesized MM /SnO2 NPs, while electrochemical and in situ infrared reflection absorption spectroscopy studies elucidated trends in activity and the nature of the reaction intermediates and products. Both EOR reactivity and selectivity towards CO2 formation of several of these MM /SnO2/C electrocatalysts are significantly higher compared to conventional Pt/C and Pt/SnO2/C catalysts. We demonstrate that the PtIr/SnO2/C catalyst with high Ir content shows outstanding catalytic property with the most negative EOR onset potential and reasonably good selectivity towards ethanol complete oxidation to CO2. PtRh/SnO2/C catalysts with a moderate Rh content exhibit the highest EOR selectivity, as deduced from infrared studies.

  15. Spitzer mid-IR spectroscopy of powerful 2Jy and 3CRR radio galaxies. II. AGN power indicators and unification

    SciTech Connect (OSTI)

    Dicken, D.; Tadhunter, C.; Morganti, R.; Axon, D.; Robinson, A.; Magagnoli, M.; Kharb, P.; Ramos Almeida, C.; Hardcastle, M.; Nesvadba, N. P. H.; Singh, V.; Kouwenhoven, M. B. N.; Rose, M.; Spoon, H.; Inskip, K. J.; Holt, J.

    2014-06-20

    It remains uncertain which continuum and emission line diagnostics best indicate the bolometric powers of active galactic nuclei (AGNs), especially given the attenuation caused by the circumnuclear material and the possible contamination by components related to star formation. Here we use mid-IR spectra along with multiwavelength data to investigate the merit of various diagnostics of AGN radiative power, including the mid-IR [Ne III] ?25.89 ?m and [O IV] ?25.89 ?m fine-structure lines, the optical [O III] ?5007 forbidden line, and mid-IR 24 ?m, 5 GHz radio, and X-ray continuum emission, for complete samples of 46 2Jy radio galaxies (0.05 < z < 0.7) and 17 3CRR FRII radio galaxies (z < 0.1). We find that the mid-IR [O IV] line is the most reliable indicator of AGN power for powerful radio-loud AGNs. By assuming that the [O IV] is emitted isotropically, and comparing the [O III] and 24 ?m luminosities of the broad- and narrow-line AGNs in our samples at fixed [O IV] luminosity, we show that the [O III] and 24 ?m emission are both mildly attenuated in the narrow-line compared to the broad-line objects by a factor of ?2. However, despite this attenuation, the [O III] and 24 ?m luminosities are better AGN power indicators for our sample than either the 5 GHz radio or the X-ray continuum luminosities. We also detect the mid-IR 9.7 ?m silicate feature in the spectra of many objects but not ubiquitously: at least 40% of the sample shows no clear evidence for these features. We conclude that, for the majority of powerful radio galaxies, the mid-IR lines are powered by AGN photoionization.

  16. Nature of the insulating ground state of the 5d postperovskite CaIrO3

    SciTech Connect (OSTI)

    Kim, Sun -Woo; Liu, Chen; Kim, Hyun -Jung; Lee, Jun -Ho; Yao, Yongxin; Ho, Kai -Ming; Cho, Jun -Hyung

    2015-08-26

    In this study, the insulating ground state of the 5d transition metal oxide CaIrO3 has been classified as a Mott-type insulator. Based on a systematic density functional theory (DFT) study with local, semilocal, and hybrid exchange-correlation functionals, we reveal that the Ir t2g states exhibit large splittings and one-dimensional electronic states along the c axis due to a tetragonal crystal field. Our hybrid DFT calculation adequately describes the antiferromagnetic (AFM) order along the c direction via a superexchange interaction between Ir4+ spins. Furthermore, the spin-orbit coupling (SOC) hybridizes the t2g states to open an insulating gap. These results indicate that CaIrO3 can be represented as a spin-orbit Slater insulator, driven by the interplay between a long-range AFM order and the SOC. Such a Slater mechanism for the gap formation is also demonstrated by the DFT + dynamical mean field theory calculation, where the metal-insulator transition and the paramagnetic to AFM phase transition are concomitant with each other.

  17. Study of 2-in1 large-aperture Nb3Sn IR quadrupoles for the LHC luminosity upgrade

    SciTech Connect (OSTI)

    Kashikhin, V.V.; Zlobin, A.V.; /Fermilab

    2006-06-01

    Double-aperture Nb{sub 3}Sn quadrupoles with asymmetric coils and with cold and warm iron yokes were studied for the dipole-first upgrade scenario of the LHC Interaction Regions (IR). This paper describes the magnet design concepts and discusses their performance parameters, including field gradient and field quality limitations.

  18. Kondo-lattice behavior and multiple characteristic temperatures in CeIr{sub 2}Ge{sub 2}

    SciTech Connect (OSTI)

    Mallik, R.; Sampathkumaran, E.V.; Paulose, P.L.; Dumschat, J.; Wortmann, G.

    1997-02-01

    The results of electrical-resistivity {rho} measurements (1.4{endash}300 K) on the alloys, Ce{sub 1{minus}x}La{sub x}Ir{sub 2}Ge{sub 2} (0{le}x{le}1), CeIr{sub 2{minus}x}(Rh,Pt){sub x}Ge{sub 2} (x=0.2 and 0.4), and CeIr{sub 2}Ge{sub 2{minus}x}(Si,Sn){sub x} (x=0.2 and 0.4), are reported in order to understand the Kondo effect in CeIr{sub 2}Ge{sub 2}. There is a significant decrease in {rho} as the temperature is lowered from 100 to 4.2 K for x = 0.0. This feature disappears for a small replacement of Ce by La (x = 0.3), thereby resulting in a single-ion Kondo effect for higher values of x. This finding establishes that the temperature T{sub coh}, characterizing the coherent scattering among the Kondo centers for x=0 is as large as about 100 K. The coherent scattering is not destroyed by small substitutions at the Ir or Ge site. The observed sensitivity of this coherence effect to a small disruption of Ce sublattice periodicity alone by La substitution is uncommon among trivalent Ce alloys. Such a large T{sub coh} value enables us to emphasize the need to invoke three characteristic temperatures for nonmagnetic Kondo lattices. {copyright} {ital 1997} {ital The American Physical Society}

  19. A car-borne highly sensitive near-IR diode-laser methane detector

    SciTech Connect (OSTI)

    Berezin, A G; Ershov, Oleg V; Shapovalov, Yu P

    2003-08-31

    A highly sensitive automated car-borne detector for measuring methane concentration in real time is designed, developed and tested under laboratory and field conditions. Measurements were made with the help of an uncooled tunable near-IR 1.65-{mu}m laser diode. The detector consists of a multipass optical cell with a 45-m long optical path and a base length of 0.5 m. The car-borne detector is intended for monitoring the methane concentration in air from the moving car to reveal the leakage of domestic gas. The sensitivity limit (standard deviation) under field conditions is 1 ppm (20 ppb under laboratory conditions) for a measuring time of 0.4 s. The measuring technique based on the detection of a single methane line ensured a high selectivity of methane detector relative to other gases. The methane detector can be easily modified for measuring other simple-molecule gases (e.g., CO, CO{sub 2}, HF, NO{sub 2}, H{sub 2}O) by replacing the diode laser and varying the parameters of the control program. (special issue devoted to the memory of academician a m prokhorov)

  20. Wrinkles of graphene on Ir(111): Macroscopic network ordering and internal multi-lobed structure

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

    Petrovic, Marin; Sadowski, Jerzy T.; Siber, Antonio; Kralj, Marko

    2015-07-17

    The large-scale production of graphene monolayer greatly relies on epitaxial samples which often display stress-relaxation features in the form of wrinkles. Wrinkles of graphene on Ir(111) are found to exhibit a fairly well ordered interconnecting network which is characterized by low-energy electron microscopy (LEEM). The high degree of quasi-hexagonal network arrangement for the graphene aligned to the underlying substrate can be well described as a (non-Poissonian) Voronoi partition of a plane. The results obtained strongly suggest that the wrinkle network is frustrated at low temperatures, retaining the order inherited from elevated temperatures when the wrinkles interconnect in junctions which mostmore » often join three wrinkles. Such frustration favors the formation of multi-lobed wrinkles which are found in scanning tunneling microscopy (STM) measurements. The existence of multiple lobes is explained within a model accounting for the interplay of the van der Waals attraction between graphene and iridium and bending energy of the wrinkle. The presented study provides new insights into wrinkling of epitaxial graphene and can be exploited to further expedite its application.« less

  1. Wrinkles of graphene on Ir(111): Macroscopic network ordering and internal multi-lobed structure

    SciTech Connect (OSTI)

    Petrovic, Marin; Sadowski, Jerzy T.; Siber, Antonio; Kralj, Marko

    2015-07-17

    The large-scale production of graphene monolayer greatly relies on epitaxial samples which often display stress-relaxation features in the form of wrinkles. Wrinkles of graphene on Ir(111) are found to exhibit a fairly well ordered interconnecting network which is characterized by low-energy electron microscopy (LEEM). The high degree of quasi-hexagonal network arrangement for the graphene aligned to the underlying substrate can be well described as a (non-Poissonian) Voronoi partition of a plane. The results obtained strongly suggest that the wrinkle network is frustrated at low temperatures, retaining the order inherited from elevated temperatures when the wrinkles interconnect in junctions which most often join three wrinkles. Such frustration favors the formation of multi-lobed wrinkles which are found in scanning tunneling microscopy (STM) measurements. The existence of multiple lobes is explained within a model accounting for the interplay of the van der Waals attraction between graphene and iridium and bending energy of the wrinkle. The presented study provides new insights into wrinkling of epitaxial graphene and can be exploited to further expedite its application.

  2. Quantitative IR Spectrum and Vibrational Assignments for Glycolaldehyde Vapor: Glycolaldehyde Measurements in Biomass Burning Plumes

    SciTech Connect (OSTI)

    Johnson, Timothy J.; Sams, Robert L.; Profeta, Luisa T.; Akagi, Sheryl; Burling, Ian R.; Yokelson, Robert J.; Williams, Stephen D.

    2013-04-15

    Glycolaldehyde (GA, 2-hydroxyethanal, C2H4O2) is a semi-volatile molecule of atmospheric importance, recently proposed as a precursor in the formation of aqueous-phase secondary organic aerosol (SOA). There are few methods to measure glycolaldehyde vapor, but infrared spectroscopy has been used successfully. Using vetted protocols we have completed the first assignment of all fundamental vibrational modes and derived quantitative IR absorption band strengths using both neat and pressure-broadened GA vapor. Even though GA is problematic due to its propensity to both dimerize and condense, our intensities agree well with the few previously published values. Using the reference ?10 band Q-branch at 860.51 cm-1, we have also determined GA mixing ratios in biomass burning plumes generated by field and laboratory burns of fuels from the southeastern and southwestern United States, including the first field measurements of glycolaldehyde in smoke. The GA emission factors were anti-correlated with modified combustion efficiency confirming release of GA from smoldering combustion. The GA emission factors (g of GA emitted per kg dry biomass burned on a dry mass basis) had a low dependence on fuel type consistent with the production mechanism being pyrolysis of cellulose. GA was emitted at 0.23 0.13% of CO from field fires and we calculate that it accounts for ~18% of the aqueous-phase SOA precursors that we were able to measure.

  3. Structural, electronic and magnetic properties of the series of double perovskites (Ca,Sr){sub 2?x}La{sub x}FeIrO{sub 6}

    SciTech Connect (OSTI)

    Bufaial, L.; Adriano, C.; Lora-Serrano, R.; Duque, J.G.S.; Mendona-Ferreira, L.; Rojas-Ayala, C.; Baggio-Saitovitch, E.; Bittar, E.M.; Pagliuso, P.G.

    2014-04-01

    Polycrystalline samples of the series of double perovskites Sr{sub 2?x}La{sub x}FeIrO{sub 6} were synthesized. Their structural, electronic and magnetic properties were investigated by X-ray powder diffraction, Mssbauer spectroscopy, magnetic susceptibility, heat capacity and electrical resistivity experiments. The compounds crystallize in a monoclinic structure and were fitted in space group P2{sub 1}/n, with a significant degree of Fe/Ir cationic disorder. As in Ca{sub 2?x}La{sub x}FeIrO{sub 6} the Sr-based system seems to evolve from an antiferromagnetic ground state for the end members (x=0.0 and x=2.0) to a ferrimagnetic order in the intermediate regions (x?1). Since Mssbauer spectra indicate that Fe valence remains 3+ with doping, this tendency of change in the nature of the microscopic interaction could be attributed to Ir valence changes, induced by La{sup 3+} electrical doping. Upon comparing both Ca and Sr series, Sr{sub 2?x}La{sub x}FeIrO{sub 6} is more structurally homogenous and presents higher magnetization and transition temperatures. Magnetic susceptibility measurements at high temperatures on Sr{sub 1.2}La{sub 0.8}FeIrO{sub 6} indicate a very high ferrimagnetic Curie temperature T{sub C}?700K. For the Sr{sub 2}FeIrO{sub 6} compound, electrical resistivity experiments under applied pressure suggest that this material might be a Mott insulator. - Graphical abstract: The Weiss constant as a function of La doping for the (Ca,Sr){sub 2?x}La{sub x}FeIrO{sub 6} series, indicating changes in FeIr magnetic coupling on both families. - Highlights: The double perovskite series (Ca,Sr){sub 2?x}La{sub x}FeIrO{sub 6} were synthesized. Changes in the Fe-Ir magnetic coupling due to La doping on both series. Evidence of high T{sub C} on Sr{sub 1.2}La{sub 0.8}FeIrO{sub 6}. Indication of Mott insulator behavior on Sr{sub 2}FeIrO{sub 6}.

  4. Thermonuclear supernovae: probing magnetic fields by positrons and late-time IR line profiles

    SciTech Connect (OSTI)

    Penney, R.; Hoeflich, P. E-mail: rpenney@g.clemson.edu

    2014-11-01

    We show the importance of γ and positron transport for the formation of late-time spectra in Type Ia supernovae (SNe Ia). The goal is to study the imprint of magnetic fields (B) on late-time IR line profiles, particularly the [Fe II] feature at 1.644 μm, which becomes prominent two to three months after the explosion. As a benchmark, we use the explosion of a Chandrasekhar mass (M {sub Ch}) white dwarf (WD) and, specifically, a delayed detonation model that can reproduce the light curves and spectra for a Branch-normal SN Ia. We assume WDs with initial magnetic surface fields between 1 and 10{sup 9} G. We discuss large-scale dipole and small-scale magnetic fields. We show that positron transport effects must be taken into account for the interpretation of emission features starting at about one to two years after maximum light, depending on the size of B. The [Fe II] line profile and its evolution with time can be understood in terms of the overall energy input by radioactive decay and the transition from a γ-ray to a positron-dominated regime. We find that the [Fe II] line at 1.644 μm can be used to analyze the overall chemical and density structure of the exploding WD up to day 200 without considering B. At later times, positron transport and magnetic field effects become important. After about day 300, the line profile allows one to probe the size of the B-field. The profile becomes sensitive to the morphology of B at about day 500. In the presence of a large-scale dipole field, a broad line is produced in M {sub Ch} mass explosions that may appear flat-topped or rounded depending on the inclination at which the SN is observed. Small or no directional dependence of the spectra is found for small-scale B. We note that narrow-line profiles require central {sup 56}Ni as shown in our previous studies. Persistent broad-line, flat-topped profiles require high-density burning, which is the signature of a WD close to M {sub Ch}. Good time coverage is required to

  5. INVISIBLE ACTIVE GALACTIC NUCLEI. I. SAMPLE SELECTION AND OPTICAL/NEAR-IR SPECTRAL ENERGY DISTRIBUTIONS

    SciTech Connect (OSTI)

    Yan, Ting; Stocke, John T.; Darling, Jeremy; Hearty, Fred

    2012-10-01

    In order to find more examples of the elusive high-redshift molecular absorbers, we have embarked on a systematic discovery program for highly obscured, radio-loud 'invisible active galactic nuclei' using the Very Large Array Faint Images of the Radio Sky at Twenty centimeters radio survey in conjunction with the Sloan Digital Sky Survey (SDSS) to identify 82 strong ({>=}300 mJy) radio sources positionally coincident with late-type, presumably gas-rich galaxies. In this first paper, the basic properties of this sample are described including the selection process and the analysis of the spectral energy distributions (SEDs) derived from the optical (SDSS) + near-IR (NIR) photometry obtained by us at the Apache Point Observatory 3.5 m. The NIR images confirm the late-type galaxy morphologies found by SDSS for these sources in all but a few (6 of 70) cases (12 previously well studied or misclassified sources were culled). Among 70 sources in the final sample, 33 show galaxy type SEDs, 17 have galaxy components to their SEDs, and 20 have quasar power-law continua. At least nine sources with galaxy SEDs have K-band flux densities too faint to be giant ellipticals if placed at their photometric redshifts. Photometric redshifts for this sample are analyzed and found to be too inaccurate for an efficient radio-frequency absorption line search; spectroscopic redshifts are required. A few new spectroscopic redshifts for these sources are presented here but more will be needed to make significant progress in this field. Subsequent papers will describe the radio continuum properties of the sample and the search for redshifted H I 21 cm absorption.

  6. On the potential of mid-IR lasers for generating high harmonics with subnanometer wavelengths in gases

    SciTech Connect (OSTI)

    Emelin, M Yu; Ryabikin, M Yu

    2013-03-31

    The influence of the magnetic field of a laser pulse and the depletion of bound levels of working-medium atoms on the generation of high harmonics of mid-IR laser radiation in gases is investigated using numerical quantum-mechanical calculations. The maximum attainable spectral widths of high harmonics are estimated for model atoms with different ionisation potentials taking into account the aforementioned limiting effects. It is shown (within a two-dimensional model) that high harmonics with wavelengths to several angstroms can be generated by irradiating helium atoms with high-power femtosecond pulses of a laser [5] with a centre wavelength of 3.9 {mu}m. The possibility of observing experimentally relativistic effects using modern desktop mid-IR laser sources is demonstrated. (extreme light fields and their applications)

  7. Decoupling of the antiferromagnetic and insulating states in Tb-doped Sr2IrO4

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

    Wang, J. C.; Aswartham, S.; Ye, Feng; Terzic, J.; Zheng, H.; Haskel, Daniel; Chikara, Shalinee; Choi, Yong; Schlottmann, P.; Custelcean, Radu; et al

    2015-12-08

    Sr2IrO4 is a spin-orbit coupled insulator with an antiferromagnetic (AFM) transition at TN = 240 K. We report results of a comprehensive study of single-crystal Sr2Ir1-xTbxO4 (0≤x≤0.03). This study found that mere 3% (x=0.03) tetravalent Tb4+(4f7) substituting for Ir4+ (rather than Sr2+) completely suppresses the long-range collinear AFM transition but retains the insulating state, leading to a phase diagram featuring a decoupling of magnetic interactions and charge gap. The insulating state at x = 0.03 is characterized by an unusually large specific heat at low temperatures and an incommensurate magnetic state having magnetic peaks at (0.95, 0, 0) and (0,more » 0.95, 0) in the neutron diffraction, suggesting a spiral or spin density wave order. It is apparent that Tb doping effectively changes the relative strength of the SOI and the tetragonal CEF and enhances the Hund’s rule coupling that competes with the SOI, and destabilizes the AFM state. However, the disappearance of the AFM accompanies no metallic state chiefly because an energy level mismatch for the Ir and Tb sites weakens charge carrier hopping and renders a persistent insulating state. Furthermore, this work highlights an unconventional correlation between the AFM and insulating states in which the magnetic transition plays no critical role in the formation of the charge gap in the iridate.« less

  8. Large enhancement of Blocking temperature by control of interfacial structures in Pt/NiFe/IrMn/MgO/Pt multilayers

    SciTech Connect (OSTI)

    Chen, Xi; Wang, Shouguo Han, Gang; Jiang, Shaolong; Yang, Kang; Liu, Qianqian; Yu, Guanghua; Liu, Jialong; Wang, Rongming

    2015-09-15

    The Blocking temperature (T{sub B}) of Pt/NiFe/IrMn/MgO/Pt multilayers was greatly enhanced from far below room temperature (RT) to above RT by inserting 1 nm thick Mg layer at IrMn/MgO interface. Furthermore, the exchange bias field (H{sub eb}) was increased as well by the control of interfacial structures. The evidence for a significant fraction of Mn-O bonding at IrMn/MgO interface without Mg insertion layer was provided by X-ray photoelectron spectroscopy. The bonding between Mn and O can decrease the antiferromagnetism of IrMn film, leading to lower value of T{sub B} in Pt/NiFe/IrMn/MgO/Pt multilayers. Ultrathin Mg film inserted at IrMn/MgO interface acting as an oxygen sinking layer can suppress the oxidation reactions between Mn and O and reduce the formation of Mn-O bonding greatly. The oxidation suppression results in the recovery of the antiferromagnetism of IrMn film, which can enhance T{sub B} and H{sub eb}. Furthermore, the high resolution transmission electron microscopy demonstrates that the Mg insertion layer can efficiently promote a high-quality MgO (200) texture. This study will enhance the understanding of physics in antiferromagnet-based spintronic devices.

  9. The role of the (111) texture on the exchange bias and interlayer coupling effects observed in sputtered NiFe/IrMn/Co trilayers

    SciTech Connect (OSTI)

    Castro, I. L.; Nascimento, V. P.; Passamani, E. C.; Takeuchi, A. Y.; Larica, C.; Tafur, M.; Pelegrini, F.

    2013-05-28

    Magnetic properties of sputtered NiFe/IrMn/Co trilayers grown on different seed layers (Cu or Ta) deposited on Si (100) substrates were investigated by magnetometry and ferromagnetic resonance measurements. Exchange bias effect and magnetic spring behavior have been studied by changing the IrMn thickness. As shown by X-ray diffraction, Ta and Cu seed layers provoke different degrees of (111) fcc-texture that directly affect the exchange bias and indirectly modify the exchange spring coupling behavior. Increasing the IrMn thickness, it was observed that the coupling angle between the Co and NiFe ferromagnetic layers increases for the Cu seed system, but it reduces for the Ta case. The results were explained considering (i) different anisotropies of the Co and IrMn layers induced by the different degree of the (111) texture and (ii) the distinct exchange bias set at the NiFe/IrMn and IrMn/Co interfaces in both systems. The NiFe and Co interlayer coupling angle is strongly correlated with both exchange bias and exchange magnetic spring phenomena. It was also shown that the highest exchange bias field occurs when an unstressed L1{sub 2} IrMn structure is stabilized.

  10. Investigation of the physical properties of the tetragonal CeMAl4Si2 (M = Rh, Ir, Pt) compounds

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

    Ghimire, N. J.; Ronning, F.; Williams, D. J.; Scott, B. L.; Luo, Yongkang; Thompson, J. D.; Bauer, E. D.

    2014-12-15

    The synthesis, crystal structure and physical properties studied by means of x-ray diffraction, magnetic, thermal and transport measurements of CeMAl4Si2 (M = Rh, Ir, Pt) are reported, along with the electronic structure calculations for LaMAl4Si2 (M = Rh, Ir, Pt). These materials adopt a tetragonal crystal structure (space group P4/mmm) comprised of BaAl4 blocks, separated by MAl2 units, stacked along the c-axis. Both CeRhAl4Si2 and CeIrAl4Si2 order antiferromagnetically below TN1 = 14 and 16 K, respectively, and undergo a second antiferromagnetic transitition at lower temperature (TN2 = 9 and 14 K, respectively). CePtAl4Si2 orders ferromagnetically below TC = 3 Kmore » with an ordered moment of μsat = 0.8 μB for a magnetic field applied perpendicular to the c-axis. Electronic structure calculations reveal quasi-2D character of the Fermi surface.« less